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stringlengths 14
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stringlengths 0
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stringclasses 2
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bool 1
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|---|---|---|---|---|---|
cosmopolitan/third_party/python/Tools/pybench/Imports.py | from pybench import Test
# First imports:
import os
import package.submodule
class SecondImport(Test):
version = 2.0
operations = 5 * 5
rounds = 40000
def test(self):
for i in range(self.rounds):
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
import os
def calibrate(self):
for i in range(self.rounds):
pass
class SecondPackageImport(Test):
version = 2.0
operations = 5 * 5
rounds = 40000
def test(self):
for i in range(self.rounds):
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
import package
def calibrate(self):
for i in range(self.rounds):
pass
class SecondSubmoduleImport(Test):
version = 2.0
operations = 5 * 5
rounds = 40000
def test(self):
for i in range(self.rounds):
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
import package.submodule
def calibrate(self):
for i in range(self.rounds):
pass
| 2,941 | 139 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Exceptions.py | from pybench import Test
class TryRaiseExcept(Test):
version = 2.0
operations = 2 + 3 + 3
rounds = 80000
def test(self):
error = ValueError
for i in range(self.rounds):
try:
raise error
except:
pass
try:
raise error
except:
pass
try:
raise error("something")
except:
pass
try:
raise error("something")
except:
pass
try:
raise error("something")
except:
pass
try:
raise error("something")
except:
pass
try:
raise error("something")
except:
pass
try:
raise error("something")
except:
pass
def calibrate(self):
error = ValueError
for i in range(self.rounds):
pass
class TryExcept(Test):
version = 2.0
operations = 15 * 10
rounds = 150000
def test(self):
for i in range(self.rounds):
try:
pass
except:
pass
try:
pass
except:
pass
try:
pass
except:
pass
try:
pass
except:
pass
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pass
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pass
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def calibrate(self):
for i in range(self.rounds):
pass
### Test to make Fredrik happy...
if __name__ == '__main__':
import timeit
timeit.TestClass = TryRaiseExcept
timeit.main(['-s', 'test = TestClass(); test.rounds = 1000',
'test.test()'])
| 13,400 | 700 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Constructs.py | from pybench import Test
class IfThenElse(Test):
version = 2.0
operations = 30*3 # hard to say...
rounds = 150000
def test(self):
a,b,c = 1,2,3
for i in range(self.rounds):
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
if a == 1:
if b == 2:
if c != 3:
c = 3
b = 3
else:
c = 2
elif b == 3:
b = 2
a = 2
elif a == 2:
a = 3
else:
a = 1
def calibrate(self):
a,b,c = 1,2,3
for i in range(self.rounds):
pass
class NestedForLoops(Test):
version = 2.0
operations = 1000*10*5
rounds = 300
def test(self):
l1 = range(1000)
l2 = range(10)
l3 = range(5)
for i in range(self.rounds):
for i in l1:
for j in l2:
for k in l3:
pass
def calibrate(self):
l1 = range(1000)
l2 = range(10)
l3 = range(5)
for i in range(self.rounds):
pass
class ForLoops(Test):
version = 2.0
operations = 5 * 5
rounds = 10000
def test(self):
l1 = range(100)
for i in range(self.rounds):
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
for i in l1:
pass
def calibrate(self):
l1 = range(1000)
for i in range(self.rounds):
pass
| 13,207 | 565 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/CommandLine.py | """ CommandLine - Get and parse command line options
NOTE: This still is very much work in progress !!!
Different version are likely to be incompatible.
TODO:
* Incorporate the changes made by (see Inbox)
* Add number range option using srange()
"""
from __future__ import print_function
__copyright__ = """\
Copyright (c), 1997-2006, Marc-Andre Lemburg ([email protected])
Copyright (c), 2000-2006, eGenix.com Software GmbH ([email protected])
See the documentation for further information on copyrights,
or contact the author. All Rights Reserved.
"""
__version__ = '1.2'
import sys, getopt, glob, os, re, traceback
### Helpers
def _getopt_flags(options):
""" Convert the option list to a getopt flag string and long opt
list
"""
s = []
l = []
for o in options:
if o.prefix == '-':
# short option
s.append(o.name)
if o.takes_argument:
s.append(':')
else:
# long option
if o.takes_argument:
l.append(o.name+'=')
else:
l.append(o.name)
return ''.join(s), l
def invisible_input(prompt='>>> '):
""" Get raw input from a terminal without echoing the characters to
the terminal, e.g. for password queries.
"""
import getpass
entry = getpass.getpass(prompt)
if entry is None:
raise KeyboardInterrupt
return entry
def fileopen(name, mode='wb', encoding=None):
""" Open a file using mode.
Default mode is 'wb' meaning to open the file for writing in
binary mode. If encoding is given, I/O to and from the file is
transparently encoded using the given encoding.
Files opened for writing are chmod()ed to 0600.
"""
if name == 'stdout':
return sys.stdout
elif name == 'stderr':
return sys.stderr
elif name == 'stdin':
return sys.stdin
else:
if encoding is not None:
import codecs
f = codecs.open(name, mode, encoding)
else:
f = open(name, mode)
if 'w' in mode:
os.chmod(name, 0o600)
return f
def option_dict(options):
""" Return a dictionary mapping option names to Option instances.
"""
d = {}
for option in options:
d[option.name] = option
return d
# Alias
getpasswd = invisible_input
_integerRE = re.compile(r'\s*(-?\d+)\s*$')
_integerRangeRE = re.compile(r'\s*(-?\d+)\s*-\s*(-?\d+)\s*$')
def srange(s,
integer=_integerRE,
integerRange=_integerRangeRE):
""" Converts a textual representation of integer numbers and ranges
to a Python list.
Supported formats: 2,3,4,2-10,-1 - -3, 5 - -2
Values are appended to the created list in the order specified
in the string.
"""
l = []
append = l.append
for entry in s.split(','):
m = integer.match(entry)
if m:
append(int(m.groups()[0]))
continue
m = integerRange.match(entry)
if m:
start,end = map(int,m.groups())
l[len(l):] = range(start,end+1)
return l
def abspath(path,
expandvars=os.path.expandvars,expanduser=os.path.expanduser,
join=os.path.join,getcwd=os.getcwd):
""" Return the corresponding absolute path for path.
path is expanded in the usual shell ways before
joining it with the current working directory.
"""
try:
path = expandvars(path)
except AttributeError:
pass
try:
path = expanduser(path)
except AttributeError:
pass
return join(getcwd(), path)
### Option classes
class Option:
""" Option base class. Takes no argument.
"""
default = None
helptext = ''
prefix = '-'
takes_argument = 0
has_default = 0
tab = 15
def __init__(self,name,help=None):
if not name[:1] == '-':
raise TypeError('option names must start with "-"')
if name[1:2] == '-':
self.prefix = '--'
self.name = name[2:]
else:
self.name = name[1:]
if help:
self.help = help
def __str__(self):
o = self
name = o.prefix + o.name
if o.takes_argument:
name = name + ' arg'
if len(name) > self.tab:
name = name + '\n' + ' ' * (self.tab + 1 + len(o.prefix))
else:
name = '%-*s ' % (self.tab, name)
description = o.help
if o.has_default:
description = description + ' (%s)' % o.default
return '%s %s' % (name, description)
class ArgumentOption(Option):
""" Option that takes an argument.
An optional default argument can be given.
"""
def __init__(self,name,help=None,default=None):
# Basemethod
Option.__init__(self,name,help)
if default is not None:
self.default = default
self.has_default = 1
self.takes_argument = 1
class SwitchOption(Option):
""" Options that can be on or off. Has an optional default value.
"""
def __init__(self,name,help=None,default=None):
# Basemethod
Option.__init__(self,name,help)
if default is not None:
self.default = default
self.has_default = 1
### Application baseclass
class Application:
""" Command line application interface with builtin argument
parsing.
"""
# Options the program accepts (Option instances)
options = []
# Standard settings; these are appended to options in __init__
preset_options = [SwitchOption('-v',
'generate verbose output'),
SwitchOption('-h',
'show this help text'),
SwitchOption('--help',
'show this help text'),
SwitchOption('--debug',
'enable debugging'),
SwitchOption('--copyright',
'show copyright'),
SwitchOption('--examples',
'show examples of usage')]
# The help layout looks like this:
# [header] - defaults to ''
#
# [synopsis] - formatted as '<self.name> %s' % self.synopsis
#
# options:
# [options] - formatted from self.options
#
# [version] - formatted as 'Version:\n %s' % self.version, if given
#
# [about] - defaults to ''
#
# Note: all fields that do not behave as template are formatted
# using the instances dictionary as substitution namespace,
# e.g. %(name)s will be replaced by the applications name.
#
# Header (default to program name)
header = ''
# Name (defaults to program name)
name = ''
# Synopsis (%(name)s is replaced by the program name)
synopsis = '%(name)s [option] files...'
# Version (optional)
version = ''
# General information printed after the possible options (optional)
about = ''
# Examples of usage to show when the --examples option is given (optional)
examples = ''
# Copyright to show
copyright = __copyright__
# Apply file globbing ?
globbing = 1
# Generate debug output ?
debug = 0
# Generate verbose output ?
verbose = 0
# Internal errors to catch
InternalError = BaseException
# Instance variables:
values = None # Dictionary of passed options (or default values)
# indexed by the options name, e.g. '-h'
files = None # List of passed filenames
optionlist = None # List of passed options
def __init__(self,argv=None):
# Setup application specs
if argv is None:
argv = sys.argv
self.filename = os.path.split(argv[0])[1]
if not self.name:
self.name = os.path.split(self.filename)[1]
else:
self.name = self.name
if not self.header:
self.header = self.name
else:
self.header = self.header
# Init .arguments list
self.arguments = argv[1:]
# Setup Option mapping
self.option_map = option_dict(self.options)
# Append preset options
for option in self.preset_options:
if not option.name in self.option_map:
self.add_option(option)
# Init .files list
self.files = []
# Start Application
rc = 0
try:
# Process startup
rc = self.startup()
if rc is not None:
raise SystemExit(rc)
# Parse command line
rc = self.parse()
if rc is not None:
raise SystemExit(rc)
# Start application
rc = self.main()
if rc is None:
rc = 0
except SystemExit as rcException:
rc = rcException
pass
except KeyboardInterrupt:
print()
print('* User Break')
print()
rc = 1
except self.InternalError:
print()
print('* Internal Error (use --debug to display the traceback)')
if self.debug:
print()
traceback.print_exc(20, sys.stdout)
elif self.verbose:
print(' %s: %s' % sys.exc_info()[:2])
print()
rc = 1
raise SystemExit(rc)
def add_option(self, option):
""" Add a new Option instance to the Application dynamically.
Note that this has to be done *before* .parse() is being
executed.
"""
self.options.append(option)
self.option_map[option.name] = option
def startup(self):
""" Set user defined instance variables.
If this method returns anything other than None, the
process is terminated with the return value as exit code.
"""
return None
def exit(self, rc=0):
""" Exit the program.
rc is used as exit code and passed back to the calling
program. It defaults to 0 which usually means: OK.
"""
raise SystemExit(rc)
def parse(self):
""" Parse the command line and fill in self.values and self.files.
After having parsed the options, the remaining command line
arguments are interpreted as files and passed to .handle_files()
for processing.
As final step the option handlers are called in the order
of the options given on the command line.
"""
# Parse arguments
self.values = values = {}
for o in self.options:
if o.has_default:
values[o.prefix+o.name] = o.default
else:
values[o.prefix+o.name] = 0
flags,lflags = _getopt_flags(self.options)
try:
optlist,files = getopt.getopt(self.arguments,flags,lflags)
if self.globbing:
l = []
for f in files:
gf = glob.glob(f)
if not gf:
l.append(f)
else:
l[len(l):] = gf
files = l
self.optionlist = optlist
self.files = files + self.files
except getopt.error as why:
self.help(why)
sys.exit(1)
# Call file handler
rc = self.handle_files(self.files)
if rc is not None:
sys.exit(rc)
# Call option handlers
for optionname, value in optlist:
# Try to convert value to integer
try:
value = int(value)
except ValueError:
pass
# Find handler and call it (or count the number of option
# instances on the command line)
handlername = 'handle' + optionname.replace('-', '_')
try:
handler = getattr(self, handlername)
except AttributeError:
if value == '':
# count the number of occurrences
if optionname in values:
values[optionname] = values[optionname] + 1
else:
values[optionname] = 1
else:
values[optionname] = value
else:
rc = handler(value)
if rc is not None:
raise SystemExit(rc)
# Apply final file check (for backward compatibility)
rc = self.check_files(self.files)
if rc is not None:
sys.exit(rc)
def check_files(self,filelist):
""" Apply some user defined checks on the files given in filelist.
This may modify filelist in place. A typical application
is checking that at least n files are given.
If this method returns anything other than None, the
process is terminated with the return value as exit code.
"""
return None
def help(self,note=''):
self.print_header()
if self.synopsis:
print('Synopsis:')
# To remain backward compatible:
try:
synopsis = self.synopsis % self.name
except (NameError, KeyError, TypeError):
synopsis = self.synopsis % self.__dict__
print(' ' + synopsis)
print()
self.print_options()
if self.version:
print('Version:')
print(' %s' % self.version)
print()
if self.about:
about = self.about % self.__dict__
print(about.strip())
print()
if note:
print('-'*72)
print('Note:',note)
print()
def notice(self,note):
print('-'*72)
print('Note:',note)
print('-'*72)
print()
def print_header(self):
print('-'*72)
print(self.header % self.__dict__)
print('-'*72)
print()
def print_options(self):
options = self.options
print('Options and default settings:')
if not options:
print(' None')
return
int = [x for x in options if x.prefix == '--']
short = [x for x in options if x.prefix == '-']
items = short + int
for o in options:
print(' ',o)
print()
#
# Example handlers:
#
# If a handler returns anything other than None, processing stops
# and the return value is passed to sys.exit() as argument.
#
# File handler
def handle_files(self,files):
""" This may process the files list in place.
"""
return None
# Short option handler
def handle_h(self,arg):
self.help()
return 0
def handle_v(self, value):
""" Turn on verbose output.
"""
self.verbose = 1
# Handlers for long options have two underscores in their name
def handle__help(self,arg):
self.help()
return 0
def handle__debug(self,arg):
self.debug = 1
# We don't want to catch internal errors:
class NoErrorToCatch(Exception): pass
self.InternalError = NoErrorToCatch
def handle__copyright(self,arg):
self.print_header()
copyright = self.copyright % self.__dict__
print(copyright.strip())
print()
return 0
def handle__examples(self,arg):
self.print_header()
if self.examples:
print('Examples:')
print()
examples = self.examples % self.__dict__
print(examples.strip())
print()
else:
print('No examples available.')
print()
return 0
def main(self):
""" Override this method as program entry point.
The return value is passed to sys.exit() as argument. If
it is None, 0 is assumed (meaning OK). Unhandled
exceptions are reported with exit status code 1 (see
__init__ for further details).
"""
return None
# Alias
CommandLine = Application
def _test():
class MyApplication(Application):
header = 'Test Application'
version = __version__
options = [Option('-v','verbose')]
def handle_v(self,arg):
print('VERBOSE, Yeah !')
cmd = MyApplication()
if not cmd.values['-h']:
cmd.help()
print('files:',cmd.files)
print('Bye...')
if __name__ == '__main__':
_test()
| 16,873 | 643 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Numbers.py | from pybench import Test
class CompareIntegers(Test):
version = 2.0
operations = 30 * 5
rounds = 120000
def test(self):
for i in range(self.rounds):
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
2 < 3
2 > 3
2 == 3
2 > 3
2 < 3
def calibrate(self):
for i in range(self.rounds):
pass
class CompareFloats(Test):
version = 2.0
operations = 30 * 5
rounds = 80000
def test(self):
for i in range(self.rounds):
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
2.1 < 3.31
2.1 > 3.31
2.1 == 3.31
2.1 > 3.31
2.1 < 3.31
def calibrate(self):
for i in range(self.rounds):
pass
class CompareFloatsIntegers(Test):
version = 2.0
operations = 30 * 5
rounds = 60000
def test(self):
for i in range(self.rounds):
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
2.1 < 4
2.1 > 4
2.1 == 4
2.1 > 4
2.1 < 4
def calibrate(self):
for i in range(self.rounds):
pass
class CompareLongs(Test):
version = 2.0
operations = 30 * 5
rounds = 70000
def test(self):
for i in range(self.rounds):
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
1234567890 < 3456789012345
1234567890 > 3456789012345
1234567890 == 3456789012345
1234567890 > 3456789012345
1234567890 < 3456789012345
def calibrate(self):
for i in range(self.rounds):
pass
| 16,198 | 785 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/clockres.py | #!/usr/bin/env python
""" clockres - calculates the resolution in seconds of a given timer.
Copyright (c) 2006, Marc-Andre Lemburg ([email protected]). See the
documentation for further information on copyrights, or contact
the author. All Rights Reserved.
"""
import time
TEST_TIME = 1.0
def clockres(timer):
d = {}
wallclock = time.time
start = wallclock()
stop = wallclock() + TEST_TIME
spin_loops = range(1000)
while 1:
now = wallclock()
if now >= stop:
break
for i in spin_loops:
d[timer()] = 1
values = sorted(d.keys())
min_diff = TEST_TIME
for i in range(len(values) - 1):
diff = values[i+1] - values[i]
if diff < min_diff:
min_diff = diff
return min_diff
if __name__ == '__main__':
print('Clock resolution of various timer implementations:')
print('time.clock: %10.3fus' % (clockres(time.clock) * 1e6))
print('time.time: %10.3fus' % (clockres(time.time) * 1e6))
try:
import systimes
print('systimes.processtime: %10.3fus' % (clockres(systimes.processtime) * 1e6))
except ImportError:
pass
| 1,193 | 43 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/README | ________________________________________________________________________
PYBENCH - A Python Benchmark Suite
________________________________________________________________________
Extendable suite of low-level benchmarks for measuring
the performance of the Python implementation
(interpreter, compiler or VM).
pybench is a collection of tests that provides a standardized way to
measure the performance of Python implementations. It takes a very
close look at different aspects of Python programs and let's you
decide which factors are more important to you than others, rather
than wrapping everything up in one number, like the other performance
tests do (e.g. pystone which is included in the Python Standard
Library).
pybench has been used in the past by several Python developers to
track down performance bottlenecks or to demonstrate the impact of
optimizations and new features in Python.
The command line interface for pybench is the file pybench.py. Run
this script with option '--help' to get a listing of the possible
options. Without options, pybench will simply execute the benchmark
and then print out a report to stdout.
Micro-Manual
------------
Run 'pybench.py -h' to see the help screen. Run 'pybench.py' to run
the benchmark suite using default settings and 'pybench.py -f <file>'
to have it store the results in a file too.
It is usually a good idea to run pybench.py multiple times to see
whether the environment, timers and benchmark run-times are suitable
for doing benchmark tests.
You can use the comparison feature of pybench.py ('pybench.py -c
<file>') to check how well the system behaves in comparison to a
reference run.
If the differences are well below 10% for each test, then you have a
system that is good for doing benchmark testings. Of you get random
differences of more than 10% or significant differences between the
values for minimum and average time, then you likely have some
background processes running which cause the readings to become
inconsistent. Examples include: web-browsers, email clients, RSS
readers, music players, backup programs, etc.
If you are only interested in a few tests of the whole suite, you can
use the filtering option, e.g. 'pybench.py -t string' will only
run/show the tests that have 'string' in their name.
This is the current output of pybench.py --help:
"""
------------------------------------------------------------------------
PYBENCH - a benchmark test suite for Python interpreters/compilers.
------------------------------------------------------------------------
Synopsis:
pybench.py [option] files...
Options and default settings:
-n arg number of rounds (10)
-f arg save benchmark to file arg ()
-c arg compare benchmark with the one in file arg ()
-s arg show benchmark in file arg, then exit ()
-w arg set warp factor to arg (10)
-t arg run only tests with names matching arg ()
-C arg set the number of calibration runs to arg (20)
-d hide noise in comparisons (0)
-v verbose output (not recommended) (0)
--with-gc enable garbage collection (0)
--with-syscheck use default sys check interval (0)
--timer arg use given timer (time.time)
-h show this help text
--help show this help text
--debug enable debugging
--copyright show copyright
--examples show examples of usage
Version:
2.1
The normal operation is to run the suite and display the
results. Use -f to save them for later reuse or comparisons.
Available timers:
time.time
time.clock
systimes.processtime
Examples:
python3.0 pybench.py -f p30.pybench
python3.1 pybench.py -f p31.pybench
python pybench.py -s p31.pybench -c p30.pybench
"""
License
-------
See LICENSE file.
Sample output
-------------
"""
-------------------------------------------------------------------------------
PYBENCH 2.1
-------------------------------------------------------------------------------
* using CPython 3.0
* disabled garbage collection
* system check interval set to maximum: 2147483647
* using timer: time.time
Calibrating tests. Please wait...
Running 10 round(s) of the suite at warp factor 10:
* Round 1 done in 6.388 seconds.
* Round 2 done in 6.485 seconds.
* Round 3 done in 6.786 seconds.
...
* Round 10 done in 6.546 seconds.
-------------------------------------------------------------------------------
Benchmark: 2006-06-12 12:09:25
-------------------------------------------------------------------------------
Rounds: 10
Warp: 10
Timer: time.time
Machine Details:
Platform ID: Linux-2.6.8-24.19-default-x86_64-with-SuSE-9.2-x86-64
Processor: x86_64
Python:
Implementation: CPython
Executable: /usr/local/bin/python
Version: 3.0
Compiler: GCC 3.3.4 (pre 3.3.5 20040809)
Bits: 64bit
Build: Oct 1 2005 15:24:35 (#1)
Unicode: UCS2
Test minimum average operation overhead
-------------------------------------------------------------------------------
BuiltinFunctionCalls: 126ms 145ms 0.28us 0.274ms
BuiltinMethodLookup: 124ms 130ms 0.12us 0.316ms
CompareFloats: 109ms 110ms 0.09us 0.361ms
CompareFloatsIntegers: 100ms 104ms 0.12us 0.271ms
CompareIntegers: 137ms 138ms 0.08us 0.542ms
CompareInternedStrings: 124ms 127ms 0.08us 1.367ms
CompareLongs: 100ms 104ms 0.10us 0.316ms
CompareStrings: 111ms 115ms 0.12us 0.929ms
CompareUnicode: 108ms 128ms 0.17us 0.693ms
ConcatStrings: 142ms 155ms 0.31us 0.562ms
ConcatUnicode: 119ms 127ms 0.42us 0.384ms
CreateInstances: 123ms 128ms 1.14us 0.367ms
CreateNewInstances: 121ms 126ms 1.49us 0.335ms
CreateStringsWithConcat: 130ms 135ms 0.14us 0.916ms
CreateUnicodeWithConcat: 130ms 135ms 0.34us 0.361ms
DictCreation: 108ms 109ms 0.27us 0.361ms
DictWithFloatKeys: 149ms 153ms 0.17us 0.678ms
DictWithIntegerKeys: 124ms 126ms 0.11us 0.915ms
DictWithStringKeys: 114ms 117ms 0.10us 0.905ms
ForLoops: 110ms 111ms 4.46us 0.063ms
IfThenElse: 118ms 119ms 0.09us 0.685ms
ListSlicing: 116ms 120ms 8.59us 0.103ms
NestedForLoops: 125ms 137ms 0.09us 0.019ms
NormalClassAttribute: 124ms 136ms 0.11us 0.457ms
NormalInstanceAttribute: 110ms 117ms 0.10us 0.454ms
PythonFunctionCalls: 107ms 113ms 0.34us 0.271ms
PythonMethodCalls: 140ms 149ms 0.66us 0.141ms
Recursion: 156ms 166ms 3.32us 0.452ms
SecondImport: 112ms 118ms 1.18us 0.180ms
SecondPackageImport: 118ms 127ms 1.27us 0.180ms
SecondSubmoduleImport: 140ms 151ms 1.51us 0.180ms
SimpleComplexArithmetic: 128ms 139ms 0.16us 0.361ms
SimpleDictManipulation: 134ms 136ms 0.11us 0.452ms
SimpleFloatArithmetic: 110ms 113ms 0.09us 0.571ms
SimpleIntFloatArithmetic: 106ms 111ms 0.08us 0.548ms
SimpleIntegerArithmetic: 106ms 109ms 0.08us 0.544ms
SimpleListManipulation: 103ms 113ms 0.10us 0.587ms
SimpleLongArithmetic: 112ms 118ms 0.18us 0.271ms
SmallLists: 105ms 116ms 0.17us 0.366ms
SmallTuples: 108ms 128ms 0.24us 0.406ms
SpecialClassAttribute: 119ms 136ms 0.11us 0.453ms
SpecialInstanceAttribute: 143ms 155ms 0.13us 0.454ms
StringMappings: 115ms 121ms 0.48us 0.405ms
StringPredicates: 120ms 129ms 0.18us 2.064ms
StringSlicing: 111ms 127ms 0.23us 0.781ms
TryExcept: 125ms 126ms 0.06us 0.681ms
TryRaiseExcept: 133ms 137ms 2.14us 0.361ms
TupleSlicing: 117ms 120ms 0.46us 0.066ms
UnicodeMappings: 156ms 160ms 4.44us 0.429ms
UnicodePredicates: 117ms 121ms 0.22us 2.487ms
UnicodeProperties: 115ms 153ms 0.38us 2.070ms
UnicodeSlicing: 126ms 129ms 0.26us 0.689ms
-------------------------------------------------------------------------------
Totals: 6283ms 6673ms
"""
________________________________________________________________________
Writing New Tests
________________________________________________________________________
pybench tests are simple modules defining one or more pybench.Test
subclasses.
Writing a test essentially boils down to providing two methods:
.test() which runs .rounds number of .operations test operations each
and .calibrate() which does the same except that it doesn't actually
execute the operations.
Here's an example:
------------------
from pybench import Test
class IntegerCounting(Test):
# Version number of the test as float (x.yy); this is important
# for comparisons of benchmark runs - tests with unequal version
# number will not get compared.
version = 1.0
# The number of abstract operations done in each round of the
# test. An operation is the basic unit of what you want to
# measure. The benchmark will output the amount of run-time per
# operation. Note that in order to raise the measured timings
# significantly above noise level, it is often required to repeat
# sets of operations more than once per test round. The measured
# overhead per test round should be less than 1 second.
operations = 20
# Number of rounds to execute per test run. This should be
# adjusted to a figure that results in a test run-time of between
# 1-2 seconds (at warp 1).
rounds = 100000
def test(self):
""" Run the test.
The test needs to run self.rounds executing
self.operations number of operations each.
"""
# Init the test
a = 1
# Run test rounds
#
for i in range(self.rounds):
# Repeat the operations per round to raise the run-time
# per operation significantly above the noise level of the
# for-loop overhead.
# Execute 20 operations (a += 1):
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
a += 1
def calibrate(self):
""" Calibrate the test.
This method should execute everything that is needed to
setup and run the test - except for the actual operations
that you intend to measure. pybench uses this method to
measure the test implementation overhead.
"""
# Init the test
a = 1
# Run test rounds (without actually doing any operation)
for i in range(self.rounds):
# Skip the actual execution of the operations, since we
# only want to measure the test's administration overhead.
pass
Registering a new test module
-----------------------------
To register a test module with pybench, the classes need to be
imported into the pybench.Setup module. pybench will then scan all the
symbols defined in that module for subclasses of pybench.Test and
automatically add them to the benchmark suite.
Breaking Comparability
----------------------
If a change is made to any individual test that means it is no
longer strictly comparable with previous runs, the '.version' class
variable should be updated. Therefafter, comparisons with previous
versions of the test will list as "n/a" to reflect the change.
Version History
---------------
2.1: made some minor changes for compatibility with Python 3.0:
- replaced cmp with divmod and range with max in Calls.py
(cmp no longer exists in 3.0, and range is a list in
Python 2.x and an iterator in Python 3.x)
2.0: rewrote parts of pybench which resulted in more repeatable
timings:
- made timer a parameter
- changed the platform default timer to use high-resolution
timers rather than process timers (which have a much lower
resolution)
- added option to select timer
- added process time timer (using systimes.py)
- changed to use min() as timing estimator (average
is still taken as well to provide an idea of the difference)
- garbage collection is turned off per default
- sys check interval is set to the highest possible value
- calibration is now a separate step and done using
a different strategy that allows measuring the test
overhead more accurately
- modified the tests to each give a run-time of between
100-200ms using warp 10
- changed default warp factor to 10 (from 20)
- compared results with timeit.py and confirmed measurements
- bumped all test versions to 2.0
- updated platform.py to the latest version
- changed the output format a bit to make it look
nicer
- refactored the APIs somewhat
1.3+: Steve Holden added the NewInstances test and the filtering
option during the NeedForSpeed sprint; this also triggered a long
discussion on how to improve benchmark timing and finally
resulted in the release of 2.0
1.3: initial checkin into the Python SVN repository
Have fun,
--
Marc-Andre Lemburg
[email protected]
| 14,376 | 372 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/NewInstances.py | from pybench import Test
# Check for new-style class support:
try:
class c(object):
pass
except NameError:
raise ImportError
###
class CreateNewInstances(Test):
version = 2.0
operations = 3 + 7 + 4
rounds = 60000
def test(self):
class c(object):
pass
class d(object):
def __init__(self,a,b,c):
self.a = a
self.b = b
self.c = c
class e(object):
def __init__(self,a,b,c=4):
self.a = a
self.b = b
self.c = c
self.d = a
self.e = b
self.f = c
for i in range(self.rounds):
o = c()
o1 = c()
o2 = c()
p = d(i,i,3)
p1 = d(i,i,3)
p2 = d(i,3,3)
p3 = d(3,i,3)
p4 = d(i,i,i)
p5 = d(3,i,3)
p6 = d(i,i,i)
q = e(i,i,3)
q1 = e(i,i,3)
q2 = e(i,i,3)
q3 = e(i,i)
def calibrate(self):
class c(object):
pass
class d(object):
def __init__(self,a,b,c):
self.a = a
self.b = b
self.c = c
class e(object):
def __init__(self,a,b,c=4):
self.a = a
self.b = b
self.c = c
self.d = a
self.e = b
self.f = c
for i in range(self.rounds):
pass
| 1,561 | 76 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Lookups.py | from pybench import Test
class SpecialClassAttribute(Test):
version = 2.0
operations = 5*(12 + 12)
rounds = 100000
def test(self):
class c:
pass
for i in range(self.rounds):
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
c.__a = 2
c.__b = 3
c.__c = 4
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
x = c.__a
x = c.__b
x = c.__c
def calibrate(self):
class c:
pass
for i in range(self.rounds):
pass
class NormalClassAttribute(Test):
version = 2.0
operations = 5*(12 + 12)
rounds = 100000
def test(self):
class c:
pass
for i in range(self.rounds):
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
c.a = 2
c.b = 3
c.c = 4
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
x = c.a
x = c.b
x = c.c
def calibrate(self):
class c:
pass
for i in range(self.rounds):
pass
class SpecialInstanceAttribute(Test):
version = 2.0
operations = 5*(12 + 12)
rounds = 100000
def test(self):
class c:
pass
o = c()
for i in range(self.rounds):
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
o.__a__ = 2
o.__b__ = 3
o.__c__ = 4
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
x = o.__a__
x = o.__b__
x = o.__c__
def calibrate(self):
class c:
pass
o = c()
for i in range(self.rounds):
pass
class NormalInstanceAttribute(Test):
version = 2.0
operations = 5*(12 + 12)
rounds = 100000
def test(self):
class c:
pass
o = c()
for i in range(self.rounds):
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
o.a = 2
o.b = 3
o.c = 4
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
x = o.a
x = o.b
x = o.c
def calibrate(self):
class c:
pass
o = c()
for i in range(self.rounds):
pass
class BuiltinMethodLookup(Test):
version = 2.0
operations = 5*(3*5 + 3*5)
rounds = 70000
def test(self):
l = []
d = {}
for i in range(self.rounds):
l.append
l.append
l.append
l.append
l.append
l.insert
l.insert
l.insert
l.insert
l.insert
l.sort
l.sort
l.sort
l.sort
l.sort
# d.has_key
# d.has_key
# d.has_key
# d.has_key
# d.has_key
d.items
d.items
d.items
d.items
d.items
d.get
d.get
d.get
d.get
d.get
l.append
l.append
l.append
l.append
l.append
l.insert
l.insert
l.insert
l.insert
l.insert
l.sort
l.sort
l.sort
l.sort
l.sort
# d.has_key
# d.has_key
# d.has_key
# d.has_key
# d.has_key
d.items
d.items
d.items
d.items
d.items
d.get
d.get
d.get
d.get
d.get
l.append
l.append
l.append
l.append
l.append
l.insert
l.insert
l.insert
l.insert
l.insert
l.sort
l.sort
l.sort
l.sort
l.sort
# d.has_key
# d.has_key
# d.has_key
# d.has_key
# d.has_key
d.items
d.items
d.items
d.items
d.items
d.get
d.get
d.get
d.get
d.get
l.append
l.append
l.append
l.append
l.append
l.insert
l.insert
l.insert
l.insert
l.insert
l.sort
l.sort
l.sort
l.sort
l.sort
# d.has_key
# d.has_key
# d.has_key
# d.has_key
# d.has_key
d.items
d.items
d.items
d.items
d.items
d.get
d.get
d.get
d.get
d.get
l.append
l.append
l.append
l.append
l.append
l.insert
l.insert
l.insert
l.insert
l.insert
l.sort
l.sort
l.sort
l.sort
l.sort
# d.has_key
# d.has_key
# d.has_key
# d.has_key
# d.has_key
d.items
d.items
d.items
d.items
d.items
d.get
d.get
d.get
d.get
d.get
def calibrate(self):
l = []
d = {}
for i in range(self.rounds):
pass
| 15,254 | 946 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Unicode.py | try:
unicode
except NameError:
raise ImportError
from pybench import Test
class ConcatUnicode(Test):
version = 2.0
operations = 10 * 5
rounds = 60000
def test(self):
# Make sure the strings are *not* interned
s = unicode(u''.join(map(str,range(100))))
t = unicode(u''.join(map(str,range(1,101))))
for i in range(self.rounds):
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
def calibrate(self):
s = unicode(u''.join(map(str,range(100))))
t = unicode(u''.join(map(str,range(1,101))))
for i in range(self.rounds):
pass
class CompareUnicode(Test):
version = 2.0
operations = 10 * 5
rounds = 150000
def test(self):
# Make sure the strings are *not* interned
s = unicode(u''.join(map(str,range(10))))
t = unicode(u''.join(map(str,range(10))) + "abc")
for i in range(self.rounds):
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
def calibrate(self):
s = unicode(u''.join(map(str,range(10))))
t = unicode(u''.join(map(str,range(10))) + "abc")
for i in range(self.rounds):
pass
class CreateUnicodeWithConcat(Test):
version = 2.0
operations = 10 * 5
rounds = 80000
def test(self):
for i in range(self.rounds):
s = u'om'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
s = s + u'xax'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
s = s + u'xax'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
s = s + u'xax'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
s = s + u'xax'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
s = s + u'xax'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
s = s + u'xax'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
s = s + u'xax'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
s = s + u'xax'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
s = s + u'xax'
s = s + u'xbx'
s = s + u'xcx'
s = s + u'xdx'
s = s + u'xex'
def calibrate(self):
for i in range(self.rounds):
pass
class UnicodeSlicing(Test):
version = 2.0
operations = 5 * 7
rounds = 140000
def test(self):
s = unicode(u''.join(map(str,range(100))))
for i in range(self.rounds):
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
def calibrate(self):
s = unicode(u''.join(map(str,range(100))))
for i in range(self.rounds):
pass
### String methods
class UnicodeMappings(Test):
version = 2.0
operations = 3 * (5 + 4 + 2 + 1)
rounds = 10000
def test(self):
s = u''.join(map(unichr,range(20)))
t = u''.join(map(unichr,range(100)))
u = u''.join(map(unichr,range(500)))
v = u''.join(map(unichr,range(1000)))
for i in range(self.rounds):
s.lower()
s.lower()
s.lower()
s.lower()
s.lower()
s.upper()
s.upper()
s.upper()
s.upper()
s.upper()
s.title()
s.title()
s.title()
s.title()
s.title()
t.lower()
t.lower()
t.lower()
t.lower()
t.upper()
t.upper()
t.upper()
t.upper()
t.title()
t.title()
t.title()
t.title()
u.lower()
u.lower()
u.upper()
u.upper()
u.title()
u.title()
v.lower()
v.upper()
v.title()
def calibrate(self):
s = u''.join(map(unichr,range(20)))
t = u''.join(map(unichr,range(100)))
u = u''.join(map(unichr,range(500)))
v = u''.join(map(unichr,range(1000)))
for i in range(self.rounds):
pass
class UnicodePredicates(Test):
version = 2.0
operations = 5 * 9
rounds = 120000
def test(self):
data = (u'abc', u'123', u' ', u'\u1234\u2345\u3456', u'\uFFFF'*10)
len_data = len(data)
for i in range(self.rounds):
s = data[i % len_data]
s.isalnum()
s.isalpha()
s.isdecimal()
s.isdigit()
s.islower()
s.isnumeric()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdecimal()
s.isdigit()
s.islower()
s.isnumeric()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdecimal()
s.isdigit()
s.islower()
s.isnumeric()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdecimal()
s.isdigit()
s.islower()
s.isnumeric()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdecimal()
s.isdigit()
s.islower()
s.isnumeric()
s.isspace()
s.istitle()
s.isupper()
def calibrate(self):
data = (u'abc', u'123', u' ', u'\u1234\u2345\u3456', u'\uFFFF'*10)
len_data = len(data)
for i in range(self.rounds):
s = data[i % len_data]
try:
import unicodedata
except ImportError:
pass
else:
class UnicodeProperties(Test):
version = 2.0
operations = 5 * 8
rounds = 100000
def test(self):
data = (u'a', u'1', u' ', u'\u1234', u'\uFFFF')
len_data = len(data)
digit = unicodedata.digit
numeric = unicodedata.numeric
decimal = unicodedata.decimal
category = unicodedata.category
bidirectional = unicodedata.bidirectional
decomposition = unicodedata.decomposition
mirrored = unicodedata.mirrored
combining = unicodedata.combining
for i in range(self.rounds):
c = data[i % len_data]
digit(c, None)
numeric(c, None)
decimal(c, None)
category(c)
bidirectional(c)
decomposition(c)
mirrored(c)
combining(c)
digit(c, None)
numeric(c, None)
decimal(c, None)
category(c)
bidirectional(c)
decomposition(c)
mirrored(c)
combining(c)
digit(c, None)
numeric(c, None)
decimal(c, None)
category(c)
bidirectional(c)
decomposition(c)
mirrored(c)
combining(c)
digit(c, None)
numeric(c, None)
decimal(c, None)
category(c)
bidirectional(c)
decomposition(c)
mirrored(c)
combining(c)
digit(c, None)
numeric(c, None)
decimal(c, None)
category(c)
bidirectional(c)
decomposition(c)
mirrored(c)
combining(c)
def calibrate(self):
data = (u'a', u'1', u' ', u'\u1234', u'\uFFFF')
len_data = len(data)
digit = unicodedata.digit
numeric = unicodedata.numeric
decimal = unicodedata.decimal
category = unicodedata.category
bidirectional = unicodedata.bidirectional
decomposition = unicodedata.decomposition
mirrored = unicodedata.mirrored
combining = unicodedata.combining
for i in range(self.rounds):
c = data[i % len_data]
| 11,110 | 542 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Calls.py | from pybench import Test
class PythonFunctionCalls(Test):
version = 2.1
operations = 5*(1+4+4+2)
rounds = 60000
def test(self):
global f,f1,g,h
# define functions
def f():
pass
def f1(x):
pass
def g(a,b,c):
return a,b,c
def h(a,b,c,d=1,e=2,f=3):
return d,e,f
# do calls
for i in range(self.rounds):
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
def calibrate(self):
global f,f1,g,h
# define functions
def f():
pass
def f1(x):
pass
def g(a,b,c):
return a,b,c
def h(a,b,c,d=1,e=2,f=3):
return d,e,f
# do calls
for i in range(self.rounds):
pass
###
class ComplexPythonFunctionCalls(Test):
version = 2.0
operations = 4*5
rounds = 100000
def test(self):
# define functions
def f(a,b,c,d=1,e=2,f=3):
return f
args = 1,2
kwargs = dict(c=3,d=4,e=5)
# do calls
for i in range(self.rounds):
f(a=i,b=i,c=i)
f(f=i,e=i,d=i,c=2,b=i,a=3)
f(1,b=i,**kwargs)
f(*args,**kwargs)
f(a=i,b=i,c=i)
f(f=i,e=i,d=i,c=2,b=i,a=3)
f(1,b=i,**kwargs)
f(*args,**kwargs)
f(a=i,b=i,c=i)
f(f=i,e=i,d=i,c=2,b=i,a=3)
f(1,b=i,**kwargs)
f(*args,**kwargs)
f(a=i,b=i,c=i)
f(f=i,e=i,d=i,c=2,b=i,a=3)
f(1,b=i,**kwargs)
f(*args,**kwargs)
f(a=i,b=i,c=i)
f(f=i,e=i,d=i,c=2,b=i,a=3)
f(1,b=i,**kwargs)
f(*args,**kwargs)
def calibrate(self):
# define functions
def f(a,b,c,d=1,e=2,f=3):
return f
args = 1,2
kwargs = dict(c=3,d=4,e=5)
# do calls
for i in range(self.rounds):
pass
###
class BuiltinFunctionCalls(Test):
version = 2.0
operations = 5*(2+5+5+5)
rounds = 60000
def test(self):
# localize functions
f0 = globals
f1 = hash
f2 = divmod
f3 = max
# do calls
for i in range(self.rounds):
f0()
f0()
f1(i)
f1(i)
f1(i)
f1(i)
f1(i)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f0()
f0()
f1(i)
f1(i)
f1(i)
f1(i)
f1(i)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f0()
f0()
f1(i)
f1(i)
f1(i)
f1(i)
f1(i)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f0()
f0()
f1(i)
f1(i)
f1(i)
f1(i)
f1(i)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f0()
f0()
f1(i)
f1(i)
f1(i)
f1(i)
f1(i)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f2(1,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
f3(1,3,2)
def calibrate(self):
# localize functions
f0 = dir
f1 = hash
f2 = divmod
f3 = max
# do calls
for i in range(self.rounds):
pass
###
class PythonMethodCalls(Test):
version = 2.0
operations = 5*(6 + 5 + 4)
rounds = 30000
def test(self):
class c:
x = 2
s = 'string'
def f(self):
return self.x
def j(self,a,b):
self.y = a
self.t = b
return self.y
def k(self,a,b,c=3):
self.y = a
self.s = b
self.t = c
o = c()
for i in range(self.rounds):
o.f()
o.f()
o.f()
o.f()
o.f()
o.f()
o.j(i,i)
o.j(i,i)
o.j(i,2)
o.j(i,2)
o.j(2,2)
o.k(i,i)
o.k(i,2)
o.k(i,2,3)
o.k(i,i,c=4)
o.f()
o.f()
o.f()
o.f()
o.f()
o.f()
o.j(i,i)
o.j(i,i)
o.j(i,2)
o.j(i,2)
o.j(2,2)
o.k(i,i)
o.k(i,2)
o.k(i,2,3)
o.k(i,i,c=4)
o.f()
o.f()
o.f()
o.f()
o.f()
o.f()
o.j(i,i)
o.j(i,i)
o.j(i,2)
o.j(i,2)
o.j(2,2)
o.k(i,i)
o.k(i,2)
o.k(i,2,3)
o.k(i,i,c=4)
o.f()
o.f()
o.f()
o.f()
o.f()
o.f()
o.j(i,i)
o.j(i,i)
o.j(i,2)
o.j(i,2)
o.j(2,2)
o.k(i,i)
o.k(i,2)
o.k(i,2,3)
o.k(i,i,c=4)
o.f()
o.f()
o.f()
o.f()
o.f()
o.f()
o.j(i,i)
o.j(i,i)
o.j(i,2)
o.j(i,2)
o.j(2,2)
o.k(i,i)
o.k(i,2)
o.k(i,2,3)
o.k(i,i,c=4)
def calibrate(self):
class c:
x = 2
s = 'string'
def f(self):
return self.x
def j(self,a,b):
self.y = a
self.t = b
def k(self,a,b,c=3):
self.y = a
self.s = b
self.t = c
o = c
for i in range(self.rounds):
pass
###
class Recursion(Test):
version = 2.0
operations = 5
rounds = 100000
def test(self):
global f
def f(x):
if x > 1:
return f(x-1)
return 1
for i in range(self.rounds):
f(10)
f(10)
f(10)
f(10)
f(10)
def calibrate(self):
global f
def f(x):
if x > 0:
return f(x-1)
return 1
for i in range(self.rounds):
pass
### Test to make Fredrik happy...
if __name__ == '__main__':
import timeit
if 0:
timeit.TestClass = PythonFunctionCalls
timeit.main(['-s', 'test = TestClass(); test.rounds = 1000',
'test.test()'])
else:
setup = """\
global f,f1,g,h
# define functions
def f():
pass
def f1(x):
pass
def g(a,b,c):
return a,b,c
def h(a,b,c,d=1,e=2,f=3):
return d,e,f
i = 1
"""
test = """\
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
f()
f1(i)
f1(i)
f1(i)
f1(i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
g(i,i,i)
h(i,i,3,i,i)
h(i,i,i,2,i,3)
"""
timeit.main(['-s', setup,
test])
| 9,252 | 561 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Instances.py | from pybench import Test
class CreateInstances(Test):
version = 2.0
operations = 3 + 7 + 4
rounds = 80000
def test(self):
class c:
pass
class d:
def __init__(self,a,b,c):
self.a = a
self.b = b
self.c = c
class e:
def __init__(self,a,b,c=4):
self.a = a
self.b = b
self.c = c
self.d = a
self.e = b
self.f = c
for i in range(self.rounds):
o = c()
o1 = c()
o2 = c()
p = d(i,i,3)
p1 = d(i,i,3)
p2 = d(i,3,3)
p3 = d(3,i,3)
p4 = d(i,i,i)
p5 = d(3,i,3)
p6 = d(i,i,i)
q = e(i,i,3)
q1 = e(i,i,3)
q2 = e(i,i,3)
q3 = e(i,i)
def calibrate(self):
class c:
pass
class d:
def __init__(self,a,b,c):
self.a = a
self.b = b
self.c = c
class e:
def __init__(self,a,b,c=4):
self.a = a
self.b = b
self.c = c
self.d = a
self.e = b
self.f = c
for i in range(self.rounds):
pass
| 1,388 | 67 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Dict.py | from pybench import Test
class DictCreation(Test):
version = 2.0
operations = 5*(5 + 5)
rounds = 80000
def test(self):
for i in range(self.rounds):
d1 = {}
d2 = {}
d3 = {}
d4 = {}
d5 = {}
d1 = {1:2,3:4,5:6}
d2 = {2:3,4:5,6:7}
d3 = {3:4,5:6,7:8}
d4 = {4:5,6:7,8:9}
d5 = {6:7,8:9,10:11}
d1 = {}
d2 = {}
d3 = {}
d4 = {}
d5 = {}
d1 = {1:2,3:4,5:6}
d2 = {2:3,4:5,6:7}
d3 = {3:4,5:6,7:8}
d4 = {4:5,6:7,8:9}
d5 = {6:7,8:9,10:11}
d1 = {}
d2 = {}
d3 = {}
d4 = {}
d5 = {}
d1 = {1:2,3:4,5:6}
d2 = {2:3,4:5,6:7}
d3 = {3:4,5:6,7:8}
d4 = {4:5,6:7,8:9}
d5 = {6:7,8:9,10:11}
d1 = {}
d2 = {}
d3 = {}
d4 = {}
d5 = {}
d1 = {1:2,3:4,5:6}
d2 = {2:3,4:5,6:7}
d3 = {3:4,5:6,7:8}
d4 = {4:5,6:7,8:9}
d5 = {6:7,8:9,10:11}
d1 = {}
d2 = {}
d3 = {}
d4 = {}
d5 = {}
d1 = {1:2,3:4,5:6}
d2 = {2:3,4:5,6:7}
d3 = {3:4,5:6,7:8}
d4 = {4:5,6:7,8:9}
d5 = {6:7,8:9,10:11}
def calibrate(self):
for i in range(self.rounds):
pass
class DictWithStringKeys(Test):
version = 2.0
operations = 5*(6 + 6)
rounds = 200000
def test(self):
d = {}
for i in range(self.rounds):
d['abc'] = 1
d['def'] = 2
d['ghi'] = 3
d['jkl'] = 4
d['mno'] = 5
d['pqr'] = 6
d['abc']
d['def']
d['ghi']
d['jkl']
d['mno']
d['pqr']
d['abc'] = 1
d['def'] = 2
d['ghi'] = 3
d['jkl'] = 4
d['mno'] = 5
d['pqr'] = 6
d['abc']
d['def']
d['ghi']
d['jkl']
d['mno']
d['pqr']
d['abc'] = 1
d['def'] = 2
d['ghi'] = 3
d['jkl'] = 4
d['mno'] = 5
d['pqr'] = 6
d['abc']
d['def']
d['ghi']
d['jkl']
d['mno']
d['pqr']
d['abc'] = 1
d['def'] = 2
d['ghi'] = 3
d['jkl'] = 4
d['mno'] = 5
d['pqr'] = 6
d['abc']
d['def']
d['ghi']
d['jkl']
d['mno']
d['pqr']
d['abc'] = 1
d['def'] = 2
d['ghi'] = 3
d['jkl'] = 4
d['mno'] = 5
d['pqr'] = 6
d['abc']
d['def']
d['ghi']
d['jkl']
d['mno']
d['pqr']
def calibrate(self):
d = {}
for i in range(self.rounds):
pass
class DictWithFloatKeys(Test):
version = 2.0
operations = 5*(6 + 6)
rounds = 150000
def test(self):
d = {}
for i in range(self.rounds):
d[1.234] = 1
d[2.345] = 2
d[3.456] = 3
d[4.567] = 4
d[5.678] = 5
d[6.789] = 6
d[1.234]
d[2.345]
d[3.456]
d[4.567]
d[5.678]
d[6.789]
d[1.234] = 1
d[2.345] = 2
d[3.456] = 3
d[4.567] = 4
d[5.678] = 5
d[6.789] = 6
d[1.234]
d[2.345]
d[3.456]
d[4.567]
d[5.678]
d[6.789]
d[1.234] = 1
d[2.345] = 2
d[3.456] = 3
d[4.567] = 4
d[5.678] = 5
d[6.789] = 6
d[1.234]
d[2.345]
d[3.456]
d[4.567]
d[5.678]
d[6.789]
d[1.234] = 1
d[2.345] = 2
d[3.456] = 3
d[4.567] = 4
d[5.678] = 5
d[6.789] = 6
d[1.234]
d[2.345]
d[3.456]
d[4.567]
d[5.678]
d[6.789]
d[1.234] = 1
d[2.345] = 2
d[3.456] = 3
d[4.567] = 4
d[5.678] = 5
d[6.789] = 6
d[1.234]
d[2.345]
d[3.456]
d[4.567]
d[5.678]
d[6.789]
def calibrate(self):
d = {}
for i in range(self.rounds):
pass
class DictWithIntegerKeys(Test):
version = 2.0
operations = 5*(6 + 6)
rounds = 200000
def test(self):
d = {}
for i in range(self.rounds):
d[1] = 1
d[2] = 2
d[3] = 3
d[4] = 4
d[5] = 5
d[6] = 6
d[1]
d[2]
d[3]
d[4]
d[5]
d[6]
d[1] = 1
d[2] = 2
d[3] = 3
d[4] = 4
d[5] = 5
d[6] = 6
d[1]
d[2]
d[3]
d[4]
d[5]
d[6]
d[1] = 1
d[2] = 2
d[3] = 3
d[4] = 4
d[5] = 5
d[6] = 6
d[1]
d[2]
d[3]
d[4]
d[5]
d[6]
d[1] = 1
d[2] = 2
d[3] = 3
d[4] = 4
d[5] = 5
d[6] = 6
d[1]
d[2]
d[3]
d[4]
d[5]
d[6]
d[1] = 1
d[2] = 2
d[3] = 3
d[4] = 4
d[5] = 5
d[6] = 6
d[1]
d[2]
d[3]
d[4]
d[5]
d[6]
def calibrate(self):
d = {}
for i in range(self.rounds):
pass
class SimpleDictManipulation(Test):
version = 2.0
operations = 5*(6 + 6 + 6 + 6)
rounds = 100000
def test(self):
d = {}
has_key = lambda key: key in d
for i in range(self.rounds):
d[0] = 3
d[1] = 4
d[2] = 5
d[3] = 3
d[4] = 4
d[5] = 5
x = d[0]
x = d[1]
x = d[2]
x = d[3]
x = d[4]
x = d[5]
has_key(0)
has_key(2)
has_key(4)
has_key(6)
has_key(8)
has_key(10)
del d[0]
del d[1]
del d[2]
del d[3]
del d[4]
del d[5]
d[0] = 3
d[1] = 4
d[2] = 5
d[3] = 3
d[4] = 4
d[5] = 5
x = d[0]
x = d[1]
x = d[2]
x = d[3]
x = d[4]
x = d[5]
has_key(0)
has_key(2)
has_key(4)
has_key(6)
has_key(8)
has_key(10)
del d[0]
del d[1]
del d[2]
del d[3]
del d[4]
del d[5]
d[0] = 3
d[1] = 4
d[2] = 5
d[3] = 3
d[4] = 4
d[5] = 5
x = d[0]
x = d[1]
x = d[2]
x = d[3]
x = d[4]
x = d[5]
has_key(0)
has_key(2)
has_key(4)
has_key(6)
has_key(8)
has_key(10)
del d[0]
del d[1]
del d[2]
del d[3]
del d[4]
del d[5]
d[0] = 3
d[1] = 4
d[2] = 5
d[3] = 3
d[4] = 4
d[5] = 5
x = d[0]
x = d[1]
x = d[2]
x = d[3]
x = d[4]
x = d[5]
has_key(0)
has_key(2)
has_key(4)
has_key(6)
has_key(8)
has_key(10)
del d[0]
del d[1]
del d[2]
del d[3]
del d[4]
del d[5]
d[0] = 3
d[1] = 4
d[2] = 5
d[3] = 3
d[4] = 4
d[5] = 5
x = d[0]
x = d[1]
x = d[2]
x = d[3]
x = d[4]
x = d[5]
has_key(0)
has_key(2)
has_key(4)
has_key(6)
has_key(8)
has_key(10)
del d[0]
del d[1]
del d[2]
del d[3]
del d[4]
del d[5]
def calibrate(self):
d = {}
has_key = lambda key: key in d
for i in range(self.rounds):
pass
| 9,261 | 505 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/pybench.py | #!/usr/local/bin/python -O
""" A Python Benchmark Suite
"""
# Note: Please keep this module compatible to Python 2.6.
#
# Tests may include features in later Python versions, but these
# should then be embedded in try-except clauses in the configuration
# module Setup.py.
#
from __future__ import print_function
# pybench Copyright
__copyright__ = """\
Copyright (c), 1997-2006, Marc-Andre Lemburg ([email protected])
Copyright (c), 2000-2006, eGenix.com Software GmbH ([email protected])
All Rights Reserved.
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee or royalty is hereby
granted, provided that the above copyright notice appear in all copies
and that both that copyright notice and this permission notice appear
in supporting documentation or portions thereof, including
modifications, that you make.
THE AUTHOR MARC-ANDRE LEMBURG DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
WITH THE USE OR PERFORMANCE OF THIS SOFTWARE !
"""
import sys
import time
import platform
from CommandLine import *
try:
import cPickle
pickle = cPickle
except ImportError:
import pickle
# Version number; version history: see README file !
__version__ = '2.1'
### Constants
# Second fractions
MILLI_SECONDS = 1e3
MICRO_SECONDS = 1e6
# Percent unit
PERCENT = 100
# Horizontal line length
LINE = 79
# Minimum test run-time
MIN_TEST_RUNTIME = 1e-3
# Number of calibration runs to use for calibrating the tests
CALIBRATION_RUNS = 20
# Number of calibration loops to run for each calibration run
CALIBRATION_LOOPS = 20
# Allow skipping calibration ?
ALLOW_SKIPPING_CALIBRATION = 1
# Timer types
TIMER_TIME_TIME = 'time.time'
TIMER_TIME_PROCESS_TIME = 'time.process_time'
TIMER_TIME_PERF_COUNTER = 'time.perf_counter'
TIMER_TIME_CLOCK = 'time.clock'
TIMER_SYSTIMES_PROCESSTIME = 'systimes.processtime'
# Choose platform default timer
if hasattr(time, 'perf_counter'):
TIMER_PLATFORM_DEFAULT = TIMER_TIME_PERF_COUNTER
elif sys.platform[:3] == 'win':
# On WinXP this has 2.5ms resolution
TIMER_PLATFORM_DEFAULT = TIMER_TIME_CLOCK
else:
# On Linux this has 1ms resolution
TIMER_PLATFORM_DEFAULT = TIMER_TIME_TIME
# Print debug information ?
_debug = 0
### Helpers
def get_timer(timertype):
if timertype == TIMER_TIME_TIME:
return time.time
elif timertype == TIMER_TIME_PROCESS_TIME:
return time.process_time
elif timertype == TIMER_TIME_PERF_COUNTER:
return time.perf_counter
elif timertype == TIMER_TIME_CLOCK:
return time.clock
elif timertype == TIMER_SYSTIMES_PROCESSTIME:
import systimes
return systimes.processtime
else:
raise TypeError('unknown timer type: %s' % timertype)
def get_machine_details():
if _debug:
print('Getting machine details...')
buildno, builddate = platform.python_build()
python = platform.python_version()
# XXX this is now always UCS4, maybe replace it with 'PEP393' in 3.3+?
if sys.maxunicode == 65535:
# UCS2 build (standard)
unitype = 'UCS2'
else:
# UCS4 build (most recent Linux distros)
unitype = 'UCS4'
bits, linkage = platform.architecture()
return {
'platform': platform.platform(),
'processor': platform.processor(),
'executable': sys.executable,
'implementation': getattr(platform, 'python_implementation',
lambda:'n/a')(),
'python': platform.python_version(),
'compiler': platform.python_compiler(),
'buildno': buildno,
'builddate': builddate,
'unicode': unitype,
'bits': bits,
}
def print_machine_details(d, indent=''):
l = ['Machine Details:',
' Platform ID: %s' % d.get('platform', 'n/a'),
' Processor: %s' % d.get('processor', 'n/a'),
'',
'Python:',
' Implementation: %s' % d.get('implementation', 'n/a'),
' Executable: %s' % d.get('executable', 'n/a'),
' Version: %s' % d.get('python', 'n/a'),
' Compiler: %s' % d.get('compiler', 'n/a'),
' Bits: %s' % d.get('bits', 'n/a'),
' Build: %s (#%s)' % (d.get('builddate', 'n/a'),
d.get('buildno', 'n/a')),
' Unicode: %s' % d.get('unicode', 'n/a'),
]
joiner = '\n' + indent
print(indent + joiner.join(l) + '\n')
### Test baseclass
class Test:
""" All test must have this class as baseclass. It provides
the necessary interface to the benchmark machinery.
The tests must set .rounds to a value high enough to let the
test run between 20-50 seconds. This is needed because
clock()-timing only gives rather inaccurate values (on Linux,
for example, it is accurate to a few hundreths of a
second). If you don't want to wait that long, use a warp
factor larger than 1.
It is also important to set the .operations variable to a
value representing the number of "virtual operations" done per
call of .run().
If you change a test in some way, don't forget to increase
its version number.
"""
### Instance variables that each test should override
# Version number of the test as float (x.yy); this is important
# for comparisons of benchmark runs - tests with unequal version
# number will not get compared.
version = 2.1
# The number of abstract operations done in each round of the
# test. An operation is the basic unit of what you want to
# measure. The benchmark will output the amount of run-time per
# operation. Note that in order to raise the measured timings
# significantly above noise level, it is often required to repeat
# sets of operations more than once per test round. The measured
# overhead per test round should be less than 1 second.
operations = 1
# Number of rounds to execute per test run. This should be
# adjusted to a figure that results in a test run-time of between
# 1-2 seconds.
rounds = 100000
### Internal variables
# Mark this class as implementing a test
is_a_test = 1
# Last timing: (real, run, overhead)
last_timing = (0.0, 0.0, 0.0)
# Warp factor to use for this test
warp = 1
# Number of calibration runs to use
calibration_runs = CALIBRATION_RUNS
# List of calibration timings
overhead_times = None
# List of test run timings
times = []
# Timer used for the benchmark
timer = TIMER_PLATFORM_DEFAULT
def __init__(self, warp=None, calibration_runs=None, timer=None):
# Set parameters
if warp is not None:
self.rounds = int(self.rounds / warp)
if self.rounds == 0:
raise ValueError('warp factor set too high')
self.warp = warp
if calibration_runs is not None:
if (not ALLOW_SKIPPING_CALIBRATION and
calibration_runs < 1):
raise ValueError('at least one calibration run is required')
self.calibration_runs = calibration_runs
if timer is not None:
self.timer = timer
# Init variables
self.times = []
self.overhead_times = []
# We want these to be in the instance dict, so that pickle
# saves them
self.version = self.version
self.operations = self.operations
self.rounds = self.rounds
def get_timer(self):
""" Return the timer function to use for the test.
"""
return get_timer(self.timer)
def compatible(self, other):
""" Return 1/0 depending on whether the test is compatible
with the other Test instance or not.
"""
if self.version != other.version:
return 0
if self.rounds != other.rounds:
return 0
return 1
def calibrate_test(self):
if self.calibration_runs == 0:
self.overhead_times = [0.0]
return
calibrate = self.calibrate
timer = self.get_timer()
calibration_loops = range(CALIBRATION_LOOPS)
# Time the calibration loop overhead
prep_times = []
for i in range(self.calibration_runs):
t = timer()
for i in calibration_loops:
pass
t = timer() - t
prep_times.append(t / CALIBRATION_LOOPS)
min_prep_time = min(prep_times)
if _debug:
print()
print('Calib. prep time = %.6fms' % (
min_prep_time * MILLI_SECONDS))
# Time the calibration runs (doing CALIBRATION_LOOPS loops of
# .calibrate() method calls each)
for i in range(self.calibration_runs):
t = timer()
for i in calibration_loops:
calibrate()
t = timer() - t
self.overhead_times.append(t / CALIBRATION_LOOPS
- min_prep_time)
# Check the measured times
min_overhead = min(self.overhead_times)
max_overhead = max(self.overhead_times)
if _debug:
print('Calib. overhead time = %.6fms' % (
min_overhead * MILLI_SECONDS))
if min_overhead < 0.0:
raise ValueError('calibration setup did not work')
if max_overhead - min_overhead > 0.1:
raise ValueError(
'overhead calibration timing range too inaccurate: '
'%r - %r' % (min_overhead, max_overhead))
def run(self):
""" Run the test in two phases: first calibrate, then
do the actual test. Be careful to keep the calibration
timing low w/r to the test timing.
"""
test = self.test
timer = self.get_timer()
# Get calibration
min_overhead = min(self.overhead_times)
# Test run
t = timer()
test()
t = timer() - t
if t < MIN_TEST_RUNTIME:
raise ValueError('warp factor too high: '
'test times are < 10ms')
eff_time = t - min_overhead
if eff_time < 0:
raise ValueError('wrong calibration')
self.last_timing = (eff_time, t, min_overhead)
self.times.append(eff_time)
def calibrate(self):
""" Calibrate the test.
This method should execute everything that is needed to
setup and run the test - except for the actual operations
that you intend to measure. pybench uses this method to
measure the test implementation overhead.
"""
return
def test(self):
""" Run the test.
The test needs to run self.rounds executing
self.operations number of operations each.
"""
return
def stat(self):
""" Return test run statistics as tuple:
(minimum run time,
average run time,
total run time,
average time per operation,
minimum overhead time)
"""
runs = len(self.times)
if runs == 0:
return 0.0, 0.0, 0.0, 0.0
min_time = min(self.times)
total_time = sum(self.times)
avg_time = total_time / float(runs)
operation_avg = total_time / float(runs
* self.rounds
* self.operations)
if self.overhead_times:
min_overhead = min(self.overhead_times)
else:
min_overhead = self.last_timing[2]
return min_time, avg_time, total_time, operation_avg, min_overhead
### Load Setup
# This has to be done after the definition of the Test class, since
# the Setup module will import subclasses using this class.
import Setup
### Benchmark base class
class Benchmark:
# Name of the benchmark
name = ''
# Number of benchmark rounds to run
rounds = 1
# Warp factor use to run the tests
warp = 1 # Warp factor
# Average benchmark round time
roundtime = 0
# Benchmark version number as float x.yy
version = 2.1
# Produce verbose output ?
verbose = 0
# Dictionary with the machine details
machine_details = None
# Timer used for the benchmark
timer = TIMER_PLATFORM_DEFAULT
def __init__(self, name, verbose=None, timer=None, warp=None,
calibration_runs=None):
if name:
self.name = name
else:
self.name = '%04i-%02i-%02i %02i:%02i:%02i' % \
(time.localtime(time.time())[:6])
if verbose is not None:
self.verbose = verbose
if timer is not None:
self.timer = timer
if warp is not None:
self.warp = warp
if calibration_runs is not None:
self.calibration_runs = calibration_runs
# Init vars
self.tests = {}
if _debug:
print('Getting machine details...')
self.machine_details = get_machine_details()
# Make .version an instance attribute to have it saved in the
# Benchmark pickle
self.version = self.version
def get_timer(self):
""" Return the timer function to use for the test.
"""
return get_timer(self.timer)
def compatible(self, other):
""" Return 1/0 depending on whether the benchmark is
compatible with the other Benchmark instance or not.
"""
if self.version != other.version:
return 0
if (self.machine_details == other.machine_details and
self.timer != other.timer):
return 0
if (self.calibration_runs == 0 and
other.calibration_runs != 0):
return 0
if (self.calibration_runs != 0 and
other.calibration_runs == 0):
return 0
return 1
def load_tests(self, setupmod, limitnames=None):
# Add tests
if self.verbose:
print('Searching for tests ...')
print('--------------------------------------')
for testclass in setupmod.__dict__.values():
if not hasattr(testclass, 'is_a_test'):
continue
name = testclass.__name__
if name == 'Test':
continue
if (limitnames is not None and
limitnames.search(name) is None):
continue
self.tests[name] = testclass(
warp=self.warp,
calibration_runs=self.calibration_runs,
timer=self.timer)
l = sorted(self.tests)
if self.verbose:
for name in l:
print(' %s' % name)
print('--------------------------------------')
print(' %i tests found' % len(l))
print()
def calibrate(self):
print('Calibrating tests. Please wait...', end=' ')
sys.stdout.flush()
if self.verbose:
print()
print()
print('Test min max')
print('-' * LINE)
tests = sorted(self.tests.items())
for i in range(len(tests)):
name, test = tests[i]
test.calibrate_test()
if self.verbose:
print('%30s: %6.3fms %6.3fms' % \
(name,
min(test.overhead_times) * MILLI_SECONDS,
max(test.overhead_times) * MILLI_SECONDS))
if self.verbose:
print()
print('Done with the calibration.')
else:
print('done.')
print()
def run(self):
tests = sorted(self.tests.items())
timer = self.get_timer()
print('Running %i round(s) of the suite at warp factor %i:' % \
(self.rounds, self.warp))
print()
self.roundtimes = []
for i in range(self.rounds):
if self.verbose:
print(' Round %-25i effective absolute overhead' % (i+1))
total_eff_time = 0.0
for j in range(len(tests)):
name, test = tests[j]
if self.verbose:
print('%30s:' % name, end=' ')
test.run()
(eff_time, abs_time, min_overhead) = test.last_timing
total_eff_time = total_eff_time + eff_time
if self.verbose:
print(' %5.0fms %5.0fms %7.3fms' % \
(eff_time * MILLI_SECONDS,
abs_time * MILLI_SECONDS,
min_overhead * MILLI_SECONDS))
self.roundtimes.append(total_eff_time)
if self.verbose:
print(' '
' ------------------------------')
print(' '
' Totals: %6.0fms' %
(total_eff_time * MILLI_SECONDS))
print()
else:
print('* Round %i done in %.3f seconds.' % (i+1,
total_eff_time))
print()
def stat(self):
""" Return benchmark run statistics as tuple:
(minimum round time,
average round time,
maximum round time)
XXX Currently not used, since the benchmark does test
statistics across all rounds.
"""
runs = len(self.roundtimes)
if runs == 0:
return 0.0, 0.0
min_time = min(self.roundtimes)
total_time = sum(self.roundtimes)
avg_time = total_time / float(runs)
max_time = max(self.roundtimes)
return (min_time, avg_time, max_time)
def print_header(self, title='Benchmark'):
print('-' * LINE)
print('%s: %s' % (title, self.name))
print('-' * LINE)
print()
print(' Rounds: %s' % self.rounds)
print(' Warp: %s' % self.warp)
print(' Timer: %s' % self.timer)
print()
if self.machine_details:
print_machine_details(self.machine_details, indent=' ')
print()
def print_benchmark(self, hidenoise=0, limitnames=None):
print('Test '
' minimum average operation overhead')
print('-' * LINE)
tests = sorted(self.tests.items())
total_min_time = 0.0
total_avg_time = 0.0
for name, test in tests:
if (limitnames is not None and
limitnames.search(name) is None):
continue
(min_time,
avg_time,
total_time,
op_avg,
min_overhead) = test.stat()
total_min_time = total_min_time + min_time
total_avg_time = total_avg_time + avg_time
print('%30s: %5.0fms %5.0fms %6.2fus %7.3fms' % \
(name,
min_time * MILLI_SECONDS,
avg_time * MILLI_SECONDS,
op_avg * MICRO_SECONDS,
min_overhead *MILLI_SECONDS))
print('-' * LINE)
print('Totals: '
' %6.0fms %6.0fms' %
(total_min_time * MILLI_SECONDS,
total_avg_time * MILLI_SECONDS,
))
print()
def print_comparison(self, compare_to, hidenoise=0, limitnames=None):
# Check benchmark versions
if compare_to.version != self.version:
print('* Benchmark versions differ: '
'cannot compare this benchmark to "%s" !' %
compare_to.name)
print()
self.print_benchmark(hidenoise=hidenoise,
limitnames=limitnames)
return
# Print header
compare_to.print_header('Comparing with')
print('Test '
' minimum run-time average run-time')
print(' '
' this other diff this other diff')
print('-' * LINE)
# Print test comparisons
tests = sorted(self.tests.items())
total_min_time = other_total_min_time = 0.0
total_avg_time = other_total_avg_time = 0.0
benchmarks_compatible = self.compatible(compare_to)
tests_compatible = 1
for name, test in tests:
if (limitnames is not None and
limitnames.search(name) is None):
continue
(min_time,
avg_time,
total_time,
op_avg,
min_overhead) = test.stat()
total_min_time = total_min_time + min_time
total_avg_time = total_avg_time + avg_time
try:
other = compare_to.tests[name]
except KeyError:
other = None
if other is None:
# Other benchmark doesn't include the given test
min_diff, avg_diff = 'n/a', 'n/a'
other_min_time = 0.0
other_avg_time = 0.0
tests_compatible = 0
else:
(other_min_time,
other_avg_time,
other_total_time,
other_op_avg,
other_min_overhead) = other.stat()
other_total_min_time = other_total_min_time + other_min_time
other_total_avg_time = other_total_avg_time + other_avg_time
if (benchmarks_compatible and
test.compatible(other)):
# Both benchmark and tests are comparable
min_diff = ((min_time * self.warp) /
(other_min_time * other.warp) - 1.0)
avg_diff = ((avg_time * self.warp) /
(other_avg_time * other.warp) - 1.0)
if hidenoise and abs(min_diff) < 10.0:
min_diff = ''
else:
min_diff = '%+5.1f%%' % (min_diff * PERCENT)
if hidenoise and abs(avg_diff) < 10.0:
avg_diff = ''
else:
avg_diff = '%+5.1f%%' % (avg_diff * PERCENT)
else:
# Benchmark or tests are not comparable
min_diff, avg_diff = 'n/a', 'n/a'
tests_compatible = 0
print('%30s: %5.0fms %5.0fms %7s %5.0fms %5.0fms %7s' % \
(name,
min_time * MILLI_SECONDS,
other_min_time * MILLI_SECONDS * compare_to.warp / self.warp,
min_diff,
avg_time * MILLI_SECONDS,
other_avg_time * MILLI_SECONDS * compare_to.warp / self.warp,
avg_diff))
print('-' * LINE)
# Summarise test results
if not benchmarks_compatible or not tests_compatible:
min_diff, avg_diff = 'n/a', 'n/a'
else:
if other_total_min_time != 0.0:
min_diff = '%+5.1f%%' % (
((total_min_time * self.warp) /
(other_total_min_time * compare_to.warp) - 1.0) * PERCENT)
else:
min_diff = 'n/a'
if other_total_avg_time != 0.0:
avg_diff = '%+5.1f%%' % (
((total_avg_time * self.warp) /
(other_total_avg_time * compare_to.warp) - 1.0) * PERCENT)
else:
avg_diff = 'n/a'
print('Totals: '
' %5.0fms %5.0fms %7s %5.0fms %5.0fms %7s' %
(total_min_time * MILLI_SECONDS,
(other_total_min_time * compare_to.warp/self.warp
* MILLI_SECONDS),
min_diff,
total_avg_time * MILLI_SECONDS,
(other_total_avg_time * compare_to.warp/self.warp
* MILLI_SECONDS),
avg_diff
))
print()
print('(this=%s, other=%s)' % (self.name,
compare_to.name))
print()
class PyBenchCmdline(Application):
header = ("PYBENCH - a benchmark test suite for Python "
"interpreters/compilers.")
version = __version__
debug = _debug
options = [ArgumentOption('-n',
'number of rounds',
Setup.Number_of_rounds),
ArgumentOption('-f',
'save benchmark to file arg',
''),
ArgumentOption('-c',
'compare benchmark with the one in file arg',
''),
ArgumentOption('-s',
'show benchmark in file arg, then exit',
''),
ArgumentOption('-w',
'set warp factor to arg',
Setup.Warp_factor),
ArgumentOption('-t',
'run only tests with names matching arg',
''),
ArgumentOption('-C',
'set the number of calibration runs to arg',
CALIBRATION_RUNS),
SwitchOption('-d',
'hide noise in comparisons',
0),
SwitchOption('-v',
'verbose output (not recommended)',
0),
SwitchOption('--with-gc',
'enable garbage collection',
0),
SwitchOption('--with-syscheck',
'use default sys check interval',
0),
ArgumentOption('--timer',
'use given timer',
TIMER_PLATFORM_DEFAULT),
]
about = """\
The normal operation is to run the suite and display the
results. Use -f to save them for later reuse or comparisons.
Available timers:
time.time
time.clock
systimes.processtime
Examples:
python2.1 pybench.py -f p21.pybench
python2.5 pybench.py -f p25.pybench
python pybench.py -s p25.pybench -c p21.pybench
"""
copyright = __copyright__
def main(self):
rounds = self.values['-n']
reportfile = self.values['-f']
show_bench = self.values['-s']
compare_to = self.values['-c']
hidenoise = self.values['-d']
warp = int(self.values['-w'])
withgc = self.values['--with-gc']
limitnames = self.values['-t']
if limitnames:
if _debug:
print('* limiting test names to one with substring "%s"' % \
limitnames)
limitnames = re.compile(limitnames, re.I)
else:
limitnames = None
verbose = self.verbose
withsyscheck = self.values['--with-syscheck']
calibration_runs = self.values['-C']
timer = self.values['--timer']
print('-' * LINE)
print('PYBENCH %s' % __version__)
print('-' * LINE)
print('* using %s %s' % (
getattr(platform, 'python_implementation', lambda:'Python')(),
' '.join(sys.version.split())))
# Switch off garbage collection
if not withgc:
try:
import gc
except ImportError:
print('* Python version doesn\'t support garbage collection')
else:
try:
gc.disable()
except NotImplementedError:
print('* Python version doesn\'t support gc.disable')
else:
print('* disabled garbage collection')
# "Disable" sys check interval
if not withsyscheck:
# Too bad the check interval uses an int instead of a long...
value = 2147483647
try:
sys.setcheckinterval(value)
except (AttributeError, NotImplementedError):
print('* Python version doesn\'t support sys.setcheckinterval')
else:
print('* system check interval set to maximum: %s' % value)
if timer == TIMER_SYSTIMES_PROCESSTIME:
import systimes
print('* using timer: systimes.processtime (%s)' % \
systimes.SYSTIMES_IMPLEMENTATION)
else:
# Check that the clock function does exist
try:
get_timer(timer)
except TypeError:
print("* Error: Unknown timer: %s" % timer)
return
print('* using timer: %s' % timer)
if hasattr(time, 'get_clock_info'):
info = time.get_clock_info(timer[5:])
print('* timer: resolution=%s, implementation=%s'
% (info.resolution, info.implementation))
print()
if compare_to:
try:
f = open(compare_to,'rb')
bench = pickle.load(f)
bench.name = compare_to
f.close()
compare_to = bench
except IOError as reason:
print('* Error opening/reading file %s: %s' % (
repr(compare_to),
reason))
compare_to = None
if show_bench:
try:
f = open(show_bench,'rb')
bench = pickle.load(f)
bench.name = show_bench
f.close()
bench.print_header()
if compare_to:
bench.print_comparison(compare_to,
hidenoise=hidenoise,
limitnames=limitnames)
else:
bench.print_benchmark(hidenoise=hidenoise,
limitnames=limitnames)
except IOError as reason:
print('* Error opening/reading file %s: %s' % (
repr(show_bench),
reason))
print()
return
if reportfile:
print('Creating benchmark: %s (rounds=%i, warp=%i)' % \
(reportfile, rounds, warp))
print()
# Create benchmark object
bench = Benchmark(reportfile,
verbose=verbose,
timer=timer,
warp=warp,
calibration_runs=calibration_runs)
bench.rounds = rounds
bench.load_tests(Setup, limitnames=limitnames)
try:
bench.calibrate()
bench.run()
except KeyboardInterrupt:
print()
print('*** KeyboardInterrupt -- Aborting')
print()
return
bench.print_header()
if compare_to:
bench.print_comparison(compare_to,
hidenoise=hidenoise,
limitnames=limitnames)
else:
bench.print_benchmark(hidenoise=hidenoise,
limitnames=limitnames)
# Ring bell
sys.stderr.write('\007')
if reportfile:
try:
f = open(reportfile,'wb')
bench.name = reportfile
pickle.dump(bench,f)
f.close()
except IOError as reason:
print('* Error opening/writing reportfile %s: %s' % (
reportfile,
reason))
print()
if __name__ == '__main__':
PyBenchCmdline()
| 32,619 | 975 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Tuples.py | from pybench import Test
class TupleSlicing(Test):
version = 2.0
operations = 3 * 25 * 10 * 7
rounds = 500
def test(self):
r = range(25)
t = tuple(range(100))
for i in range(self.rounds):
for j in r:
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
m = t[50:]
m = t[:25]
m = t[50:55]
m = t[:-1]
m = t[1:]
m = t[-10:]
m = t[:10]
def calibrate(self):
r = range(25)
t = tuple(range(100))
for i in range(self.rounds):
for j in r:
pass
class SmallTuples(Test):
version = 2.0
operations = 5*(1 + 3 + 6 + 2)
rounds = 90000
def test(self):
for i in range(self.rounds):
t = (1,2,3,4,5,6)
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
l = list(t)
t = tuple(l)
t = (1,2,3,4,5,6)
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
l = list(t)
t = tuple(l)
t = (1,2,3,4,5,6)
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
l = list(t)
t = tuple(l)
t = (1,2,3,4,5,6)
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
l = list(t)
t = tuple(l)
t = (1,2,3,4,5,6)
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c,d,e,f = t
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
a,b,c = t[:3]
l = list(t)
t = tuple(l)
def calibrate(self):
for i in range(self.rounds):
pass
| 8,034 | 361 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/systimes.py | #!/usr/bin/env python
""" systimes() user and system timer implementations for use by
pybench.
This module implements various different strategies for measuring
performance timings. It tries to choose the best available method
based on the platform and available tools.
On Windows, it is recommended to have the Mark Hammond win32
package installed. Alternatively, the Thomas Heller ctypes
packages can also be used.
On Unix systems, the standard resource module provides the highest
resolution timings. Unfortunately, it is not available on all Unix
platforms.
If no supported timing methods based on process time can be found,
the module reverts to the highest resolution wall-clock timer
instead. The system time part will then always be 0.0.
The module exports one public API:
def systimes():
Return the current timer values for measuring user and system
time as tuple of seconds (user_time, system_time).
Copyright (c) 2006, Marc-Andre Lemburg ([email protected]). See the
documentation for further information on copyrights, or contact
the author. All Rights Reserved.
"""
from __future__ import print_function
import time, sys
if __name__ == 'PYOBJ.COM':
import resource
#
# Note: Please keep this module compatible to Python 1.5.2.
#
# TODOs:
#
# * Add ctypes wrapper for new clock_gettime() real-time POSIX APIs;
# these will then provide nano-second resolution where available.
#
# * Add a function that returns the resolution of systimes()
# values, ie. systimesres().
#
### Choose an implementation
SYSTIMES_IMPLEMENTATION = None
USE_CTYPES_GETPROCESSTIMES = 'ctypes GetProcessTimes() wrapper'
USE_WIN32PROCESS_GETPROCESSTIMES = 'win32process.GetProcessTimes()'
USE_RESOURCE_GETRUSAGE = 'resource.getrusage()'
USE_PROCESS_TIME_CLOCK = 'time.clock() (process time)'
USE_WALL_TIME_CLOCK = 'time.clock() (wall-clock)'
USE_WALL_TIME_TIME = 'time.time() (wall-clock)'
if sys.platform[:3] == 'win':
# Windows platform
try:
import win32process
except ImportError:
try:
import ctypes
except ImportError:
# Use the wall-clock implementation time.clock(), since this
# is the highest resolution clock available on Windows
SYSTIMES_IMPLEMENTATION = USE_WALL_TIME_CLOCK
else:
SYSTIMES_IMPLEMENTATION = USE_CTYPES_GETPROCESSTIMES
else:
SYSTIMES_IMPLEMENTATION = USE_WIN32PROCESS_GETPROCESSTIMES
else:
# All other platforms
try:
import resource
except ImportError:
pass
else:
SYSTIMES_IMPLEMENTATION = USE_RESOURCE_GETRUSAGE
# Fall-back solution
if SYSTIMES_IMPLEMENTATION is None:
# Check whether we can use time.clock() as approximation
# for systimes()
start = time.clock()
time.sleep(0.1)
stop = time.clock()
if stop - start < 0.001:
# Looks like time.clock() is usable (and measures process
# time)
SYSTIMES_IMPLEMENTATION = USE_PROCESS_TIME_CLOCK
else:
# Use wall-clock implementation time.time() since this provides
# the highest resolution clock on most systems
SYSTIMES_IMPLEMENTATION = USE_WALL_TIME_TIME
### Implementations
def getrusage_systimes():
return resource.getrusage(resource.RUSAGE_SELF)[:2]
def process_time_clock_systimes():
return (time.clock(), 0.0)
def wall_clock_clock_systimes():
return (time.clock(), 0.0)
def wall_clock_time_systimes():
return (time.time(), 0.0)
# Number of clock ticks per second for the values returned
# by GetProcessTimes() on Windows.
#
# Note: Ticks returned by GetProcessTimes() are 100ns intervals on
# Windows XP. However, the process times are only updated with every
# clock tick and the frequency of these is somewhat lower: depending
# on the OS version between 10ms and 15ms. Even worse, the process
# time seems to be allocated to process currently running when the
# clock interrupt arrives, ie. it is possible that the current time
# slice gets accounted to a different process.
WIN32_PROCESS_TIMES_TICKS_PER_SECOND = 1e7
def win32process_getprocesstimes_systimes():
d = win32process.GetProcessTimes(win32process.GetCurrentProcess())
return (d['UserTime'] / WIN32_PROCESS_TIMES_TICKS_PER_SECOND,
d['KernelTime'] / WIN32_PROCESS_TIMES_TICKS_PER_SECOND)
def ctypes_getprocesstimes_systimes():
creationtime = ctypes.c_ulonglong()
exittime = ctypes.c_ulonglong()
kerneltime = ctypes.c_ulonglong()
usertime = ctypes.c_ulonglong()
rc = ctypes.windll.kernel32.GetProcessTimes(
ctypes.windll.kernel32.GetCurrentProcess(),
ctypes.byref(creationtime),
ctypes.byref(exittime),
ctypes.byref(kerneltime),
ctypes.byref(usertime))
if not rc:
raise TypeError('GetProcessTimes() returned an error')
return (usertime.value / WIN32_PROCESS_TIMES_TICKS_PER_SECOND,
kerneltime.value / WIN32_PROCESS_TIMES_TICKS_PER_SECOND)
# Select the default for the systimes() function
if SYSTIMES_IMPLEMENTATION is USE_RESOURCE_GETRUSAGE:
systimes = getrusage_systimes
elif SYSTIMES_IMPLEMENTATION is USE_PROCESS_TIME_CLOCK:
systimes = process_time_clock_systimes
elif SYSTIMES_IMPLEMENTATION is USE_WALL_TIME_CLOCK:
systimes = wall_clock_clock_systimes
elif SYSTIMES_IMPLEMENTATION is USE_WALL_TIME_TIME:
systimes = wall_clock_time_systimes
elif SYSTIMES_IMPLEMENTATION is USE_WIN32PROCESS_GETPROCESSTIMES:
systimes = win32process_getprocesstimes_systimes
elif SYSTIMES_IMPLEMENTATION is USE_CTYPES_GETPROCESSTIMES:
systimes = ctypes_getprocesstimes_systimes
else:
raise TypeError('no suitable systimes() implementation found')
def processtime():
""" Return the total time spent on the process.
This is the sum of user and system time as returned by
systimes().
"""
user, system = systimes()
return user + system
### Testing
def some_workload():
x = 0
for i in range(10000000):
x = x + 1
def test_workload():
print('Testing systimes() under load conditions')
t0 = systimes()
some_workload()
t1 = systimes()
print('before:', t0)
print('after:', t1)
print('differences:', (t1[0] - t0[0], t1[1] - t0[1]))
print()
def test_idle():
print('Testing systimes() under idle conditions')
t0 = systimes()
time.sleep(1)
t1 = systimes()
print('before:', t0)
print('after:', t1)
print('differences:', (t1[0] - t0[0], t1[1] - t0[1]))
print()
if __name__ == '__main__':
print('Using %s as timer' % SYSTIMES_IMPLEMENTATION)
print()
test_workload()
test_idle()
| 6,720 | 218 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Arithmetic.py | from pybench import Test
class SimpleIntegerArithmetic(Test):
version = 2.0
operations = 5 * (3 + 5 + 5 + 3 + 3 + 3)
rounds = 120000
def test(self):
for i in range(self.rounds):
a = 2
b = 3
c = 3
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2
b = 3
c = 3
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2
b = 3
c = 3
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2
b = 3
c = 3
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2
b = 3
c = 3
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
def calibrate(self):
for i in range(self.rounds):
pass
class SimpleFloatArithmetic(Test):
version = 2.0
operations = 5 * (3 + 5 + 5 + 3 + 3 + 3)
rounds = 120000
def test(self):
for i in range(self.rounds):
a = 2.1
b = 3.3332
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2.1
b = 3.3332
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2.1
b = 3.3332
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2.1
b = 3.3332
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2.1
b = 3.3332
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
def calibrate(self):
for i in range(self.rounds):
pass
class SimpleIntFloatArithmetic(Test):
version = 2.0
operations = 5 * (3 + 5 + 5 + 3 + 3 + 3)
rounds = 120000
def test(self):
for i in range(self.rounds):
a = 2
b = 3
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2
b = 3
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2
b = 3
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2
b = 3
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2
b = 3
c = 3.14159
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
def calibrate(self):
for i in range(self.rounds):
pass
class SimpleLongArithmetic(Test):
version = 2.0
operations = 5 * (3 + 5 + 5 + 3 + 3 + 3)
rounds = 60000
def test(self):
for i in range(self.rounds):
a = 2220001
b = 100001
c = 30005
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2220001
b = 100001
c = 30005
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2220001
b = 100001
c = 30005
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2220001
b = 100001
c = 30005
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2220001
b = 100001
c = 30005
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
def calibrate(self):
for i in range(self.rounds):
pass
class SimpleComplexArithmetic(Test):
version = 2.0
operations = 5 * (3 + 5 + 5 + 3 + 3 + 3)
rounds = 80000
def test(self):
for i in range(self.rounds):
a = 2 + 3j
b = 2.5 + 4.5j
c = 1.2 + 6.2j
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2 + 3j
b = 2.5 + 4.5j
c = 1.2 + 6.2j
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2 + 3j
b = 2.5 + 4.5j
c = 1.2 + 6.2j
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2 + 3j
b = 2.5 + 4.5j
c = 1.2 + 6.2j
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
a = 2 + 3j
b = 2.5 + 4.5j
c = 1.2 + 6.2j
c = a + b
c = b + c
c = c + a
c = a + b
c = b + c
c = c - a
c = a - b
c = b - c
c = c - a
c = b - c
c = a / b
c = b / a
c = c / b
c = a * b
c = b * a
c = c * b
c = a / b
c = b / a
c = c / b
def calibrate(self):
for i in range(self.rounds):
pass
| 13,565 | 778 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Strings.py | from pybench import Test
import sys
try:
intern
except NameError:
intern = sys.intern
class ConcatStrings(Test):
version = 2.0
operations = 10 * 5
rounds = 100000
def test(self):
# Make sure the strings are *not* interned
s = ''.join(map(str,range(100)))
t = ''.join(map(str,range(1,101)))
for i in range(self.rounds):
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
t + s
def calibrate(self):
s = ''.join(map(str,range(100)))
t = ''.join(map(str,range(1,101)))
for i in range(self.rounds):
pass
class CompareStrings(Test):
version = 2.0
operations = 10 * 5
rounds = 200000
def test(self):
# Make sure the strings are *not* interned
s = ''.join(map(str,range(10)))
t = ''.join(map(str,range(10))) + "abc"
for i in range(self.rounds):
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
t < s
t > s
t == s
t > s
t < s
def calibrate(self):
s = ''.join(map(str,range(10)))
t = ''.join(map(str,range(10))) + "abc"
for i in range(self.rounds):
pass
class CompareInternedStrings(Test):
version = 2.0
operations = 10 * 5
rounds = 300000
def test(self):
# Make sure the strings *are* interned
s = intern(''.join(map(str,range(10))))
t = s
for i in range(self.rounds):
t == s
t == s
t >= s
t > s
t < s
t == s
t == s
t >= s
t > s
t < s
t == s
t == s
t >= s
t > s
t < s
t == s
t == s
t >= s
t > s
t < s
t == s
t == s
t >= s
t > s
t < s
t == s
t == s
t >= s
t > s
t < s
t == s
t == s
t >= s
t > s
t < s
t == s
t == s
t >= s
t > s
t < s
t == s
t == s
t >= s
t > s
t < s
t == s
t == s
t >= s
t > s
t < s
def calibrate(self):
s = intern(''.join(map(str,range(10))))
t = s
for i in range(self.rounds):
pass
class CreateStringsWithConcat(Test):
version = 2.0
operations = 10 * 5
rounds = 200000
def test(self):
for i in range(self.rounds):
s = 'om'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
s = s + 'xax'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
s = s + 'xax'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
s = s + 'xax'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
s = s + 'xax'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
s = s + 'xax'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
s = s + 'xax'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
s = s + 'xax'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
s = s + 'xax'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
s = s + 'xax'
s = s + 'xbx'
s = s + 'xcx'
s = s + 'xdx'
s = s + 'xex'
def calibrate(self):
for i in range(self.rounds):
pass
class StringSlicing(Test):
version = 2.0
operations = 5 * 7
rounds = 160000
def test(self):
s = ''.join(map(str,range(100)))
for i in range(self.rounds):
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
s[50:]
s[:25]
s[50:55]
s[-1:]
s[:1]
s[2:]
s[11:-11]
def calibrate(self):
s = ''.join(map(str,range(100)))
for i in range(self.rounds):
pass
### String methods
if hasattr('', 'lower'):
class StringMappings(Test):
version = 2.0
operations = 3 * (5 + 4 + 2 + 1)
rounds = 70000
def test(self):
s = ''.join(map(chr,range(20)))
t = ''.join(map(chr,range(50)))
u = ''.join(map(chr,range(100)))
v = ''.join(map(chr,range(256)))
for i in range(self.rounds):
s.lower()
s.lower()
s.lower()
s.lower()
s.lower()
s.upper()
s.upper()
s.upper()
s.upper()
s.upper()
s.title()
s.title()
s.title()
s.title()
s.title()
t.lower()
t.lower()
t.lower()
t.lower()
t.upper()
t.upper()
t.upper()
t.upper()
t.title()
t.title()
t.title()
t.title()
u.lower()
u.lower()
u.upper()
u.upper()
u.title()
u.title()
v.lower()
v.upper()
v.title()
def calibrate(self):
s = ''.join(map(chr,range(20)))
t = ''.join(map(chr,range(50)))
u = ''.join(map(chr,range(100)))
v = ''.join(map(chr,range(256)))
for i in range(self.rounds):
pass
class StringPredicates(Test):
version = 2.0
operations = 10 * 7
rounds = 100000
def test(self):
data = ('abc', '123', ' ', '\xe4\xf6\xfc', '\xdf'*10)
len_data = len(data)
for i in range(self.rounds):
s = data[i % len_data]
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
s.isalnum()
s.isalpha()
s.isdigit()
s.islower()
s.isspace()
s.istitle()
s.isupper()
def calibrate(self):
data = ('abc', '123', ' ', '\u1234\u2345\u3456', '\uFFFF'*10)
data = ('abc', '123', ' ', '\xe4\xf6\xfc', '\xdf'*10)
len_data = len(data)
for i in range(self.rounds):
s = data[i % len_data]
| 10,946 | 569 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Lists.py | from pybench import Test
class SimpleListManipulation(Test):
version = 2.0
operations = 5* (6 + 6 + 6)
rounds = 130000
def test(self):
l = []
append = l.append
for i in range(self.rounds):
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
x = l[0]
x = l[1]
x = l[2]
x = l[3]
x = l[4]
x = l[5]
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
x = l[0]
x = l[1]
x = l[2]
x = l[3]
x = l[4]
x = l[5]
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
x = l[0]
x = l[1]
x = l[2]
x = l[3]
x = l[4]
x = l[5]
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
x = l[0]
x = l[1]
x = l[2]
x = l[3]
x = l[4]
x = l[5]
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
x = l[0]
x = l[1]
x = l[2]
x = l[3]
x = l[4]
x = l[5]
if len(l) > 10000:
# cut down the size
del l[:]
def calibrate(self):
l = []
append = l.append
for i in range(self.rounds):
pass
class ListSlicing(Test):
version = 2.0
operations = 25*(3+1+2+1)
rounds = 800
def test(self):
n = list(range(100))
r = list(range(25))
for i in range(self.rounds):
l = n[:]
for j in r:
m = l[50:]
m = l[:25]
m = l[50:55]
l[:3] = n
m = l[:-1]
m = l[1:]
l[-1:] = n
def calibrate(self):
n = list(range(100))
r = list(range(25))
for i in range(self.rounds):
for j in r:
pass
class SmallLists(Test):
version = 2.0
operations = 5*(1+ 6 + 6 + 3 + 1)
rounds = 80000
def test(self):
for i in range(self.rounds):
l = []
append = l.append
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
l[:3] = [1,2,3]
m = l[:-1]
m = l[1:]
l[-1:] = [4,5,6]
l = []
append = l.append
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
l[:3] = [1,2,3]
m = l[:-1]
m = l[1:]
l[-1:] = [4,5,6]
l = []
append = l.append
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
l[:3] = [1,2,3]
m = l[:-1]
m = l[1:]
l[-1:] = [4,5,6]
l = []
append = l.append
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
l[:3] = [1,2,3]
m = l[:-1]
m = l[1:]
l[-1:] = [4,5,6]
l = []
append = l.append
append(2)
append(3)
append(4)
append(2)
append(3)
append(4)
l[0] = 3
l[1] = 4
l[2] = 5
l[3] = 3
l[4] = 4
l[5] = 5
l[:3] = [1,2,3]
m = l[:-1]
m = l[1:]
l[-1:] = [4,5,6]
def calibrate(self):
for i in range(self.rounds):
pass
class SimpleListComprehensions(Test):
version = 2.0
operations = 6
rounds = 20000
def test(self):
n = list(range(10)) * 10
for i in range(self.rounds):
l = [x for x in n]
l = [x for x in n if x]
l = [x for x in n if not x]
l = [x for x in n]
l = [x for x in n if x]
l = [x for x in n if not x]
def calibrate(self):
n = list(range(10)) * 10
for i in range(self.rounds):
pass
class NestedListComprehensions(Test):
version = 2.0
operations = 6
rounds = 20000
def test(self):
m = list(range(10))
n = list(range(10))
for i in range(self.rounds):
l = [x for x in n for y in m]
l = [y for x in n for y in m]
l = [x for x in n for y in m if y]
l = [y for x in n for y in m if x]
l = [x for x in n for y in m if not y]
l = [y for x in n for y in m if not x]
def calibrate(self):
m = list(range(10))
n = list(range(10))
for i in range(self.rounds):
pass
| 6,460 | 351 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/Setup.py | #!python
# Setup file for pybench
#
# This file has to import all tests to be run; it is executed as
# Python source file, so you can do all kinds of manipulations here
# rather than having to edit the tests themselves.
#
# Note: Please keep this module compatible to Python 1.5.2.
#
# Tests may include features in later Python versions, but these
# should then be embedded in try-except clauses in this configuration
# module.
# Defaults
Number_of_rounds = 10
Warp_factor = 10
# Import tests
from Arithmetic import *
from Calls import *
from Constructs import *
from Lookups import *
from Instances import *
try:
from NewInstances import *
except ImportError:
pass
from Lists import *
from Tuples import *
from Dict import *
from Exceptions import *
try:
from With import *
except SyntaxError:
pass
from Imports import *
from Strings import *
from Numbers import *
try:
from Unicode import *
except (ImportError, SyntaxError):
pass
| 961 | 44 | jart/cosmopolitan | false |
cosmopolitan/third_party/python/Tools/pybench/package/submodule.py | 0 | 1 | jart/cosmopolitan | false |
|
cosmopolitan/third_party/python/Tools/pybench/package/__init__.py | 0 | 1 | jart/cosmopolitan | false |
|
cosmopolitan/third_party/python/.python/this-is-a-kludge.txt | 0 | 1 | jart/cosmopolitan | false |
|
cosmopolitan/third_party/sqlite3/status.c | /*
** 2008 June 18
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This module implements the sqlite3_status() interface and related
** functionality.
*/
#include "third_party/sqlite3/sqliteInt.h"
#include "third_party/sqlite3/vdbeInt.inc"
/*
** Variables in which to record status information.
*/
#if SQLITE_PTRSIZE>4
typedef sqlite3_int64 sqlite3StatValueType;
#else
typedef u32 sqlite3StatValueType;
#endif
typedef struct sqlite3StatType sqlite3StatType;
static SQLITE_WSD struct sqlite3StatType {
sqlite3StatValueType nowValue[10]; /* Current value */
sqlite3StatValueType mxValue[10]; /* Maximum value */
} sqlite3Stat = { {0,}, {0,} };
/*
** Elements of sqlite3Stat[] are protected by either the memory allocator
** mutex, or by the pcache1 mutex. The following array determines which.
*/
static const char statMutex[] = {
0, /* SQLITE_STATUS_MEMORY_USED */
1, /* SQLITE_STATUS_PAGECACHE_USED */
1, /* SQLITE_STATUS_PAGECACHE_OVERFLOW */
0, /* SQLITE_STATUS_SCRATCH_USED */
0, /* SQLITE_STATUS_SCRATCH_OVERFLOW */
0, /* SQLITE_STATUS_MALLOC_SIZE */
0, /* SQLITE_STATUS_PARSER_STACK */
1, /* SQLITE_STATUS_PAGECACHE_SIZE */
0, /* SQLITE_STATUS_SCRATCH_SIZE */
0, /* SQLITE_STATUS_MALLOC_COUNT */
};
/* The "wsdStat" macro will resolve to the status information
** state vector. If writable static data is unsupported on the target,
** we have to locate the state vector at run-time. In the more common
** case where writable static data is supported, wsdStat can refer directly
** to the "sqlite3Stat" state vector declared above.
*/
#ifdef SQLITE_OMIT_WSD
# define wsdStatInit sqlite3StatType *x = &GLOBAL(sqlite3StatType,sqlite3Stat)
# define wsdStat x[0]
#else
# define wsdStatInit
# define wsdStat sqlite3Stat
#endif
/*
** Return the current value of a status parameter. The caller must
** be holding the appropriate mutex.
*/
sqlite3_int64 sqlite3StatusValue(int op){
wsdStatInit;
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
assert( op>=0 && op<ArraySize(statMutex) );
assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
: sqlite3MallocMutex()) );
return wsdStat.nowValue[op];
}
/*
** Add N to the value of a status record. The caller must hold the
** appropriate mutex. (Locking is checked by assert()).
**
** The StatusUp() routine can accept positive or negative values for N.
** The value of N is added to the current status value and the high-water
** mark is adjusted if necessary.
**
** The StatusDown() routine lowers the current value by N. The highwater
** mark is unchanged. N must be non-negative for StatusDown().
*/
void sqlite3StatusUp(int op, int N){
wsdStatInit;
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
assert( op>=0 && op<ArraySize(statMutex) );
assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
: sqlite3MallocMutex()) );
wsdStat.nowValue[op] += N;
if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){
wsdStat.mxValue[op] = wsdStat.nowValue[op];
}
}
void sqlite3StatusDown(int op, int N){
wsdStatInit;
assert( N>=0 );
assert( op>=0 && op<ArraySize(statMutex) );
assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
: sqlite3MallocMutex()) );
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
wsdStat.nowValue[op] -= N;
}
/*
** Adjust the highwater mark if necessary.
** The caller must hold the appropriate mutex.
*/
void sqlite3StatusHighwater(int op, int X){
sqlite3StatValueType newValue;
wsdStatInit;
assert( X>=0 );
newValue = (sqlite3StatValueType)X;
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
assert( op>=0 && op<ArraySize(statMutex) );
assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
: sqlite3MallocMutex()) );
assert( op==SQLITE_STATUS_MALLOC_SIZE
|| op==SQLITE_STATUS_PAGECACHE_SIZE
|| op==SQLITE_STATUS_PARSER_STACK );
if( newValue>wsdStat.mxValue[op] ){
wsdStat.mxValue[op] = newValue;
}
}
/*
** Query status information.
*/
int sqlite3_status64(
int op,
sqlite3_int64 *pCurrent,
sqlite3_int64 *pHighwater,
int resetFlag
){
sqlite3_mutex *pMutex;
wsdStatInit;
if( op<0 || op>=ArraySize(wsdStat.nowValue) ){
return SQLITE_MISUSE_BKPT;
}
#ifdef SQLITE_ENABLE_API_ARMOR
if( pCurrent==0 || pHighwater==0 ) return SQLITE_MISUSE_BKPT;
#endif
pMutex = statMutex[op] ? sqlite3Pcache1Mutex() : sqlite3MallocMutex();
sqlite3_mutex_enter(pMutex);
*pCurrent = wsdStat.nowValue[op];
*pHighwater = wsdStat.mxValue[op];
if( resetFlag ){
wsdStat.mxValue[op] = wsdStat.nowValue[op];
}
sqlite3_mutex_leave(pMutex);
(void)pMutex; /* Prevent warning when SQLITE_THREADSAFE=0 */
return SQLITE_OK;
}
int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag){
sqlite3_int64 iCur = 0, iHwtr = 0;
int rc;
#ifdef SQLITE_ENABLE_API_ARMOR
if( pCurrent==0 || pHighwater==0 ) return SQLITE_MISUSE_BKPT;
#endif
rc = sqlite3_status64(op, &iCur, &iHwtr, resetFlag);
if( rc==0 ){
*pCurrent = (int)iCur;
*pHighwater = (int)iHwtr;
}
return rc;
}
/*
** Return the number of LookasideSlot elements on the linked list
*/
static u32 countLookasideSlots(LookasideSlot *p){
u32 cnt = 0;
while( p ){
p = p->pNext;
cnt++;
}
return cnt;
}
/*
** Count the number of slots of lookaside memory that are outstanding
*/
int sqlite3LookasideUsed(sqlite3 *db, int *pHighwater){
u32 nInit = countLookasideSlots(db->lookaside.pInit);
u32 nFree = countLookasideSlots(db->lookaside.pFree);
#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
nInit += countLookasideSlots(db->lookaside.pSmallInit);
nFree += countLookasideSlots(db->lookaside.pSmallFree);
#endif /* SQLITE_OMIT_TWOSIZE_LOOKASIDE */
if( pHighwater ) *pHighwater = db->lookaside.nSlot - nInit;
return db->lookaside.nSlot - (nInit+nFree);
}
/*
** Query status information for a single database connection
*/
int sqlite3_db_status(
sqlite3 *db, /* The database connection whose status is desired */
int op, /* Status verb */
int *pCurrent, /* Write current value here */
int *pHighwater, /* Write high-water mark here */
int resetFlag /* Reset high-water mark if true */
){
int rc = SQLITE_OK; /* Return code */
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) || pCurrent==0|| pHighwater==0 ){
return SQLITE_MISUSE_BKPT;
}
#endif
sqlite3_mutex_enter(db->mutex);
switch( op ){
case SQLITE_DBSTATUS_LOOKASIDE_USED: {
*pCurrent = sqlite3LookasideUsed(db, pHighwater);
if( resetFlag ){
LookasideSlot *p = db->lookaside.pFree;
if( p ){
while( p->pNext ) p = p->pNext;
p->pNext = db->lookaside.pInit;
db->lookaside.pInit = db->lookaside.pFree;
db->lookaside.pFree = 0;
}
#ifndef SQLITE_OMIT_TWOSIZE_LOOKASIDE
p = db->lookaside.pSmallFree;
if( p ){
while( p->pNext ) p = p->pNext;
p->pNext = db->lookaside.pSmallInit;
db->lookaside.pSmallInit = db->lookaside.pSmallFree;
db->lookaside.pSmallFree = 0;
}
#endif
}
break;
}
case SQLITE_DBSTATUS_LOOKASIDE_HIT:
case SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE:
case SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL: {
testcase( op==SQLITE_DBSTATUS_LOOKASIDE_HIT );
testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE );
testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL );
assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)>=0 );
assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)<3 );
*pCurrent = 0;
*pHighwater = db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT];
if( resetFlag ){
db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT] = 0;
}
break;
}
/*
** Return an approximation for the amount of memory currently used
** by all pagers associated with the given database connection. The
** highwater mark is meaningless and is returned as zero.
*/
case SQLITE_DBSTATUS_CACHE_USED_SHARED:
case SQLITE_DBSTATUS_CACHE_USED: {
int totalUsed = 0;
int i;
sqlite3BtreeEnterAll(db);
for(i=0; i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
Pager *pPager = sqlite3BtreePager(pBt);
int nByte = sqlite3PagerMemUsed(pPager);
if( op==SQLITE_DBSTATUS_CACHE_USED_SHARED ){
nByte = nByte / sqlite3BtreeConnectionCount(pBt);
}
totalUsed += nByte;
}
}
sqlite3BtreeLeaveAll(db);
*pCurrent = totalUsed;
*pHighwater = 0;
break;
}
/*
** *pCurrent gets an accurate estimate of the amount of memory used
** to store the schema for all databases (main, temp, and any ATTACHed
** databases. *pHighwater is set to zero.
*/
case SQLITE_DBSTATUS_SCHEMA_USED: {
int i; /* Used to iterate through schemas */
int nByte = 0; /* Used to accumulate return value */
sqlite3BtreeEnterAll(db);
db->pnBytesFreed = &nByte;
assert( db->lookaside.pEnd==db->lookaside.pTrueEnd );
db->lookaside.pEnd = db->lookaside.pStart;
for(i=0; i<db->nDb; i++){
Schema *pSchema = db->aDb[i].pSchema;
if( ALWAYS(pSchema!=0) ){
HashElem *p;
nByte += sqlite3GlobalConfig.m.xRoundup(sizeof(HashElem)) * (
pSchema->tblHash.count
+ pSchema->trigHash.count
+ pSchema->idxHash.count
+ pSchema->fkeyHash.count
);
nByte += sqlite3_msize(pSchema->tblHash.ht);
nByte += sqlite3_msize(pSchema->trigHash.ht);
nByte += sqlite3_msize(pSchema->idxHash.ht);
nByte += sqlite3_msize(pSchema->fkeyHash.ht);
for(p=sqliteHashFirst(&pSchema->trigHash); p; p=sqliteHashNext(p)){
sqlite3DeleteTrigger(db, (Trigger*)sqliteHashData(p));
}
for(p=sqliteHashFirst(&pSchema->tblHash); p; p=sqliteHashNext(p)){
sqlite3DeleteTable(db, (Table *)sqliteHashData(p));
}
}
}
db->pnBytesFreed = 0;
db->lookaside.pEnd = db->lookaside.pTrueEnd;
sqlite3BtreeLeaveAll(db);
*pHighwater = 0;
*pCurrent = nByte;
break;
}
/*
** *pCurrent gets an accurate estimate of the amount of memory used
** to store all prepared statements.
** *pHighwater is set to zero.
*/
case SQLITE_DBSTATUS_STMT_USED: {
struct Vdbe *pVdbe; /* Used to iterate through VMs */
int nByte = 0; /* Used to accumulate return value */
db->pnBytesFreed = &nByte;
assert( db->lookaside.pEnd==db->lookaside.pTrueEnd );
db->lookaside.pEnd = db->lookaside.pStart;
for(pVdbe=db->pVdbe; pVdbe; pVdbe=pVdbe->pVNext){
sqlite3VdbeDelete(pVdbe);
}
db->lookaside.pEnd = db->lookaside.pTrueEnd;
db->pnBytesFreed = 0;
*pHighwater = 0; /* IMP: R-64479-57858 */
*pCurrent = nByte;
break;
}
/*
** Set *pCurrent to the total cache hits or misses encountered by all
** pagers the database handle is connected to. *pHighwater is always set
** to zero.
*/
case SQLITE_DBSTATUS_CACHE_SPILL:
op = SQLITE_DBSTATUS_CACHE_WRITE+1;
/* no break */ deliberate_fall_through
case SQLITE_DBSTATUS_CACHE_HIT:
case SQLITE_DBSTATUS_CACHE_MISS:
case SQLITE_DBSTATUS_CACHE_WRITE:{
int i;
int nRet = 0;
assert( SQLITE_DBSTATUS_CACHE_MISS==SQLITE_DBSTATUS_CACHE_HIT+1 );
assert( SQLITE_DBSTATUS_CACHE_WRITE==SQLITE_DBSTATUS_CACHE_HIT+2 );
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt ){
Pager *pPager = sqlite3BtreePager(db->aDb[i].pBt);
sqlite3PagerCacheStat(pPager, op, resetFlag, &nRet);
}
}
*pHighwater = 0; /* IMP: R-42420-56072 */
/* IMP: R-54100-20147 */
/* IMP: R-29431-39229 */
*pCurrent = nRet;
break;
}
/* Set *pCurrent to non-zero if there are unresolved deferred foreign
** key constraints. Set *pCurrent to zero if all foreign key constraints
** have been satisfied. The *pHighwater is always set to zero.
*/
case SQLITE_DBSTATUS_DEFERRED_FKS: {
*pHighwater = 0; /* IMP: R-11967-56545 */
*pCurrent = db->nDeferredImmCons>0 || db->nDeferredCons>0;
break;
}
default: {
rc = SQLITE_ERROR;
}
}
sqlite3_mutex_leave(db->mutex);
return rc;
}
| 12,998 | 399 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_snippet.c | /*
** 2009 Oct 23
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
*/
#include "third_party/sqlite3/fts3Int.h"
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
#include "libc/str/str.h"
#include "libc/assert.h"
#ifndef SQLITE_AMALGAMATION
typedef sqlite3_int64 i64;
#endif
/*
** Characters that may appear in the second argument to matchinfo().
*/
#define FTS3_MATCHINFO_NPHRASE 'p' /* 1 value */
#define FTS3_MATCHINFO_NCOL 'c' /* 1 value */
#define FTS3_MATCHINFO_NDOC 'n' /* 1 value */
#define FTS3_MATCHINFO_AVGLENGTH 'a' /* nCol values */
#define FTS3_MATCHINFO_LENGTH 'l' /* nCol values */
#define FTS3_MATCHINFO_LCS 's' /* nCol values */
#define FTS3_MATCHINFO_HITS 'x' /* 3*nCol*nPhrase values */
#define FTS3_MATCHINFO_LHITS 'y' /* nCol*nPhrase values */
#define FTS3_MATCHINFO_LHITS_BM 'b' /* nCol*nPhrase values */
/*
** The default value for the second argument to matchinfo().
*/
#define FTS3_MATCHINFO_DEFAULT "pcx"
/*
** Used as an fts3ExprIterate() context when loading phrase doclists to
** Fts3Expr.aDoclist[]/nDoclist.
*/
typedef struct LoadDoclistCtx LoadDoclistCtx;
struct LoadDoclistCtx {
Fts3Cursor *pCsr; /* FTS3 Cursor */
int nPhrase; /* Number of phrases seen so far */
int nToken; /* Number of tokens seen so far */
};
/*
** The following types are used as part of the implementation of the
** fts3BestSnippet() routine.
*/
typedef struct SnippetIter SnippetIter;
typedef struct SnippetPhrase SnippetPhrase;
typedef struct SnippetFragment SnippetFragment;
struct SnippetIter {
Fts3Cursor *pCsr; /* Cursor snippet is being generated from */
int iCol; /* Extract snippet from this column */
int nSnippet; /* Requested snippet length (in tokens) */
int nPhrase; /* Number of phrases in query */
SnippetPhrase *aPhrase; /* Array of size nPhrase */
int iCurrent; /* First token of current snippet */
};
struct SnippetPhrase {
int nToken; /* Number of tokens in phrase */
char *pList; /* Pointer to start of phrase position list */
i64 iHead; /* Next value in position list */
char *pHead; /* Position list data following iHead */
i64 iTail; /* Next value in trailing position list */
char *pTail; /* Position list data following iTail */
};
struct SnippetFragment {
int iCol; /* Column snippet is extracted from */
int iPos; /* Index of first token in snippet */
u64 covered; /* Mask of query phrases covered */
u64 hlmask; /* Mask of snippet terms to highlight */
};
/*
** This type is used as an fts3ExprIterate() context object while
** accumulating the data returned by the matchinfo() function.
*/
typedef struct MatchInfo MatchInfo;
struct MatchInfo {
Fts3Cursor *pCursor; /* FTS3 Cursor */
int nCol; /* Number of columns in table */
int nPhrase; /* Number of matchable phrases in query */
sqlite3_int64 nDoc; /* Number of docs in database */
char flag;
u32 *aMatchinfo; /* Pre-allocated buffer */
};
/*
** An instance of this structure is used to manage a pair of buffers, each
** (nElem * sizeof(u32)) bytes in size. See the MatchinfoBuffer code below
** for details.
*/
struct MatchinfoBuffer {
u8 aRef[3];
int nElem;
int bGlobal; /* Set if global data is loaded */
char *zMatchinfo;
u32 aMatchinfo[1];
};
/*
** The snippet() and offsets() functions both return text values. An instance
** of the following structure is used to accumulate those values while the
** functions are running. See fts3StringAppend() for details.
*/
typedef struct StrBuffer StrBuffer;
struct StrBuffer {
char *z; /* Pointer to buffer containing string */
int n; /* Length of z in bytes (excl. nul-term) */
int nAlloc; /* Allocated size of buffer z in bytes */
};
/*************************************************************************
** Start of MatchinfoBuffer code.
*/
/*
** Allocate a two-slot MatchinfoBuffer object.
*/
static MatchinfoBuffer *fts3MIBufferNew(size_t nElem, const char *zMatchinfo){
MatchinfoBuffer *pRet;
sqlite3_int64 nByte = sizeof(u32) * (2*(sqlite3_int64)nElem + 1)
+ sizeof(MatchinfoBuffer);
sqlite3_int64 nStr = strlen(zMatchinfo);
pRet = sqlite3Fts3MallocZero(nByte + nStr+1);
if( pRet ){
pRet->aMatchinfo[0] = (u8*)(&pRet->aMatchinfo[1]) - (u8*)pRet;
pRet->aMatchinfo[1+nElem] = pRet->aMatchinfo[0]
+ sizeof(u32)*((int)nElem+1);
pRet->nElem = (int)nElem;
pRet->zMatchinfo = ((char*)pRet) + nByte;
memcpy(pRet->zMatchinfo, zMatchinfo, nStr+1);
pRet->aRef[0] = 1;
}
return pRet;
}
static void fts3MIBufferFree(void *p){
MatchinfoBuffer *pBuf = (MatchinfoBuffer*)((u8*)p - ((u32*)p)[-1]);
assert( (u32*)p==&pBuf->aMatchinfo[1]
|| (u32*)p==&pBuf->aMatchinfo[pBuf->nElem+2]
);
if( (u32*)p==&pBuf->aMatchinfo[1] ){
pBuf->aRef[1] = 0;
}else{
pBuf->aRef[2] = 0;
}
if( pBuf->aRef[0]==0 && pBuf->aRef[1]==0 && pBuf->aRef[2]==0 ){
sqlite3_free(pBuf);
}
}
static void (*fts3MIBufferAlloc(MatchinfoBuffer *p, u32 **paOut))(void*){
void (*xRet)(void*) = 0;
u32 *aOut = 0;
if( p->aRef[1]==0 ){
p->aRef[1] = 1;
aOut = &p->aMatchinfo[1];
xRet = fts3MIBufferFree;
}
else if( p->aRef[2]==0 ){
p->aRef[2] = 1;
aOut = &p->aMatchinfo[p->nElem+2];
xRet = fts3MIBufferFree;
}else{
aOut = (u32*)sqlite3_malloc64(p->nElem * sizeof(u32));
if( aOut ){
xRet = sqlite3_free;
if( p->bGlobal ) memcpy(aOut, &p->aMatchinfo[1], p->nElem*sizeof(u32));
}
}
*paOut = aOut;
return xRet;
}
static void fts3MIBufferSetGlobal(MatchinfoBuffer *p){
p->bGlobal = 1;
memcpy(&p->aMatchinfo[2+p->nElem], &p->aMatchinfo[1], p->nElem*sizeof(u32));
}
/*
** Free a MatchinfoBuffer object allocated using fts3MIBufferNew()
*/
void sqlite3Fts3MIBufferFree(MatchinfoBuffer *p){
if( p ){
assert( p->aRef[0]==1 );
p->aRef[0] = 0;
if( p->aRef[0]==0 && p->aRef[1]==0 && p->aRef[2]==0 ){
sqlite3_free(p);
}
}
}
/*
** End of MatchinfoBuffer code.
*************************************************************************/
/*
** This function is used to help iterate through a position-list. A position
** list is a list of unique integers, sorted from smallest to largest. Each
** element of the list is represented by an FTS3 varint that takes the value
** of the difference between the current element and the previous one plus
** two. For example, to store the position-list:
**
** 4 9 113
**
** the three varints:
**
** 6 7 106
**
** are encoded.
**
** When this function is called, *pp points to the start of an element of
** the list. *piPos contains the value of the previous entry in the list.
** After it returns, *piPos contains the value of the next element of the
** list and *pp is advanced to the following varint.
*/
static void fts3GetDeltaPosition(char **pp, i64 *piPos){
int iVal;
*pp += fts3GetVarint32(*pp, &iVal);
*piPos += (iVal-2);
}
/*
** Helper function for fts3ExprIterate() (see below).
*/
static int fts3ExprIterate2(
Fts3Expr *pExpr, /* Expression to iterate phrases of */
int *piPhrase, /* Pointer to phrase counter */
int (*x)(Fts3Expr*,int,void*), /* Callback function to invoke for phrases */
void *pCtx /* Second argument to pass to callback */
){
int rc; /* Return code */
int eType = pExpr->eType; /* Type of expression node pExpr */
if( eType!=FTSQUERY_PHRASE ){
assert( pExpr->pLeft && pExpr->pRight );
rc = fts3ExprIterate2(pExpr->pLeft, piPhrase, x, pCtx);
if( rc==SQLITE_OK && eType!=FTSQUERY_NOT ){
rc = fts3ExprIterate2(pExpr->pRight, piPhrase, x, pCtx);
}
}else{
rc = x(pExpr, *piPhrase, pCtx);
(*piPhrase)++;
}
return rc;
}
/*
** Iterate through all phrase nodes in an FTS3 query, except those that
** are part of a sub-tree that is the right-hand-side of a NOT operator.
** For each phrase node found, the supplied callback function is invoked.
**
** If the callback function returns anything other than SQLITE_OK,
** the iteration is abandoned and the error code returned immediately.
** Otherwise, SQLITE_OK is returned after a callback has been made for
** all eligible phrase nodes.
*/
static int fts3ExprIterate(
Fts3Expr *pExpr, /* Expression to iterate phrases of */
int (*x)(Fts3Expr*,int,void*), /* Callback function to invoke for phrases */
void *pCtx /* Second argument to pass to callback */
){
int iPhrase = 0; /* Variable used as the phrase counter */
return fts3ExprIterate2(pExpr, &iPhrase, x, pCtx);
}
/*
** This is an fts3ExprIterate() callback used while loading the doclists
** for each phrase into Fts3Expr.aDoclist[]/nDoclist. See also
** fts3ExprLoadDoclists().
*/
static int fts3ExprLoadDoclistsCb(Fts3Expr *pExpr, int iPhrase, void *ctx){
int rc = SQLITE_OK;
Fts3Phrase *pPhrase = pExpr->pPhrase;
LoadDoclistCtx *p = (LoadDoclistCtx *)ctx;
UNUSED_PARAMETER(iPhrase);
p->nPhrase++;
p->nToken += pPhrase->nToken;
return rc;
}
/*
** Load the doclists for each phrase in the query associated with FTS3 cursor
** pCsr.
**
** If pnPhrase is not NULL, then *pnPhrase is set to the number of matchable
** phrases in the expression (all phrases except those directly or
** indirectly descended from the right-hand-side of a NOT operator). If
** pnToken is not NULL, then it is set to the number of tokens in all
** matchable phrases of the expression.
*/
static int fts3ExprLoadDoclists(
Fts3Cursor *pCsr, /* Fts3 cursor for current query */
int *pnPhrase, /* OUT: Number of phrases in query */
int *pnToken /* OUT: Number of tokens in query */
){
int rc; /* Return Code */
LoadDoclistCtx sCtx = {0,0,0}; /* Context for fts3ExprIterate() */
sCtx.pCsr = pCsr;
rc = fts3ExprIterate(pCsr->pExpr, fts3ExprLoadDoclistsCb, (void *)&sCtx);
if( pnPhrase ) *pnPhrase = sCtx.nPhrase;
if( pnToken ) *pnToken = sCtx.nToken;
return rc;
}
static int fts3ExprPhraseCountCb(Fts3Expr *pExpr, int iPhrase, void *ctx){
(*(int *)ctx)++;
pExpr->iPhrase = iPhrase;
return SQLITE_OK;
}
static int fts3ExprPhraseCount(Fts3Expr *pExpr){
int nPhrase = 0;
(void)fts3ExprIterate(pExpr, fts3ExprPhraseCountCb, (void *)&nPhrase);
return nPhrase;
}
/*
** Advance the position list iterator specified by the first two
** arguments so that it points to the first element with a value greater
** than or equal to parameter iNext.
*/
static void fts3SnippetAdvance(char **ppIter, i64 *piIter, int iNext){
char *pIter = *ppIter;
if( pIter ){
i64 iIter = *piIter;
while( iIter<iNext ){
if( 0==(*pIter & 0xFE) ){
iIter = -1;
pIter = 0;
break;
}
fts3GetDeltaPosition(&pIter, &iIter);
}
*piIter = iIter;
*ppIter = pIter;
}
}
/*
** Advance the snippet iterator to the next candidate snippet.
*/
static int fts3SnippetNextCandidate(SnippetIter *pIter){
int i; /* Loop counter */
if( pIter->iCurrent<0 ){
/* The SnippetIter object has just been initialized. The first snippet
** candidate always starts at offset 0 (even if this candidate has a
** score of 0.0).
*/
pIter->iCurrent = 0;
/* Advance the 'head' iterator of each phrase to the first offset that
** is greater than or equal to (iNext+nSnippet).
*/
for(i=0; i<pIter->nPhrase; i++){
SnippetPhrase *pPhrase = &pIter->aPhrase[i];
fts3SnippetAdvance(&pPhrase->pHead, &pPhrase->iHead, pIter->nSnippet);
}
}else{
int iStart;
int iEnd = 0x7FFFFFFF;
for(i=0; i<pIter->nPhrase; i++){
SnippetPhrase *pPhrase = &pIter->aPhrase[i];
if( pPhrase->pHead && pPhrase->iHead<iEnd ){
iEnd = pPhrase->iHead;
}
}
if( iEnd==0x7FFFFFFF ){
return 1;
}
pIter->iCurrent = iStart = iEnd - pIter->nSnippet + 1;
for(i=0; i<pIter->nPhrase; i++){
SnippetPhrase *pPhrase = &pIter->aPhrase[i];
fts3SnippetAdvance(&pPhrase->pHead, &pPhrase->iHead, iEnd+1);
fts3SnippetAdvance(&pPhrase->pTail, &pPhrase->iTail, iStart);
}
}
return 0;
}
/*
** Retrieve information about the current candidate snippet of snippet
** iterator pIter.
*/
static void fts3SnippetDetails(
SnippetIter *pIter, /* Snippet iterator */
u64 mCovered, /* Bitmask of phrases already covered */
int *piToken, /* OUT: First token of proposed snippet */
int *piScore, /* OUT: "Score" for this snippet */
u64 *pmCover, /* OUT: Bitmask of phrases covered */
u64 *pmHighlight /* OUT: Bitmask of terms to highlight */
){
int iStart = pIter->iCurrent; /* First token of snippet */
int iScore = 0; /* Score of this snippet */
int i; /* Loop counter */
u64 mCover = 0; /* Mask of phrases covered by this snippet */
u64 mHighlight = 0; /* Mask of tokens to highlight in snippet */
for(i=0; i<pIter->nPhrase; i++){
SnippetPhrase *pPhrase = &pIter->aPhrase[i];
if( pPhrase->pTail ){
char *pCsr = pPhrase->pTail;
i64 iCsr = pPhrase->iTail;
while( iCsr<(iStart+pIter->nSnippet) && iCsr>=iStart ){
int j;
u64 mPhrase = (u64)1 << (i%64);
u64 mPos = (u64)1 << (iCsr - iStart);
assert( iCsr>=iStart && (iCsr - iStart)<=64 );
assert( i>=0 );
if( (mCover|mCovered)&mPhrase ){
iScore++;
}else{
iScore += 1000;
}
mCover |= mPhrase;
for(j=0; j<pPhrase->nToken; j++){
mHighlight |= (mPos>>j);
}
if( 0==(*pCsr & 0x0FE) ) break;
fts3GetDeltaPosition(&pCsr, &iCsr);
}
}
}
/* Set the output variables before returning. */
*piToken = iStart;
*piScore = iScore;
*pmCover = mCover;
*pmHighlight = mHighlight;
}
/*
** This function is an fts3ExprIterate() callback used by fts3BestSnippet().
** Each invocation populates an element of the SnippetIter.aPhrase[] array.
*/
static int fts3SnippetFindPositions(Fts3Expr *pExpr, int iPhrase, void *ctx){
SnippetIter *p = (SnippetIter *)ctx;
SnippetPhrase *pPhrase = &p->aPhrase[iPhrase];
char *pCsr;
int rc;
pPhrase->nToken = pExpr->pPhrase->nToken;
rc = sqlite3Fts3EvalPhrasePoslist(p->pCsr, pExpr, p->iCol, &pCsr);
assert( rc==SQLITE_OK || pCsr==0 );
if( pCsr ){
i64 iFirst = 0;
pPhrase->pList = pCsr;
fts3GetDeltaPosition(&pCsr, &iFirst);
if( iFirst<0 ){
rc = FTS_CORRUPT_VTAB;
}else{
pPhrase->pHead = pCsr;
pPhrase->pTail = pCsr;
pPhrase->iHead = iFirst;
pPhrase->iTail = iFirst;
}
}else{
assert( rc!=SQLITE_OK || (
pPhrase->pList==0 && pPhrase->pHead==0 && pPhrase->pTail==0
));
}
return rc;
}
/*
** Select the fragment of text consisting of nFragment contiguous tokens
** from column iCol that represent the "best" snippet. The best snippet
** is the snippet with the highest score, where scores are calculated
** by adding:
**
** (a) +1 point for each occurrence of a matchable phrase in the snippet.
**
** (b) +1000 points for the first occurrence of each matchable phrase in
** the snippet for which the corresponding mCovered bit is not set.
**
** The selected snippet parameters are stored in structure *pFragment before
** returning. The score of the selected snippet is stored in *piScore
** before returning.
*/
static int fts3BestSnippet(
int nSnippet, /* Desired snippet length */
Fts3Cursor *pCsr, /* Cursor to create snippet for */
int iCol, /* Index of column to create snippet from */
u64 mCovered, /* Mask of phrases already covered */
u64 *pmSeen, /* IN/OUT: Mask of phrases seen */
SnippetFragment *pFragment, /* OUT: Best snippet found */
int *piScore /* OUT: Score of snippet pFragment */
){
int rc; /* Return Code */
int nList; /* Number of phrases in expression */
SnippetIter sIter; /* Iterates through snippet candidates */
sqlite3_int64 nByte; /* Number of bytes of space to allocate */
int iBestScore = -1; /* Best snippet score found so far */
int i; /* Loop counter */
memset(&sIter, 0, sizeof(sIter));
/* Iterate through the phrases in the expression to count them. The same
** callback makes sure the doclists are loaded for each phrase.
*/
rc = fts3ExprLoadDoclists(pCsr, &nList, 0);
if( rc!=SQLITE_OK ){
return rc;
}
/* Now that it is known how many phrases there are, allocate and zero
** the required space using malloc().
*/
nByte = sizeof(SnippetPhrase) * nList;
sIter.aPhrase = (SnippetPhrase *)sqlite3Fts3MallocZero(nByte);
if( !sIter.aPhrase ){
return SQLITE_NOMEM;
}
/* Initialize the contents of the SnippetIter object. Then iterate through
** the set of phrases in the expression to populate the aPhrase[] array.
*/
sIter.pCsr = pCsr;
sIter.iCol = iCol;
sIter.nSnippet = nSnippet;
sIter.nPhrase = nList;
sIter.iCurrent = -1;
rc = fts3ExprIterate(pCsr->pExpr, fts3SnippetFindPositions, (void*)&sIter);
if( rc==SQLITE_OK ){
/* Set the *pmSeen output variable. */
for(i=0; i<nList; i++){
if( sIter.aPhrase[i].pHead ){
*pmSeen |= (u64)1 << (i%64);
}
}
/* Loop through all candidate snippets. Store the best snippet in
** *pFragment. Store its associated 'score' in iBestScore.
*/
pFragment->iCol = iCol;
while( !fts3SnippetNextCandidate(&sIter) ){
int iPos;
int iScore;
u64 mCover;
u64 mHighlite;
fts3SnippetDetails(&sIter, mCovered, &iPos, &iScore, &mCover,&mHighlite);
assert( iScore>=0 );
if( iScore>iBestScore ){
pFragment->iPos = iPos;
pFragment->hlmask = mHighlite;
pFragment->covered = mCover;
iBestScore = iScore;
}
}
*piScore = iBestScore;
}
sqlite3_free(sIter.aPhrase);
return rc;
}
/*
** Append a string to the string-buffer passed as the first argument.
**
** If nAppend is negative, then the length of the string zAppend is
** determined using strlen().
*/
static int fts3StringAppend(
StrBuffer *pStr, /* Buffer to append to */
const char *zAppend, /* Pointer to data to append to buffer */
int nAppend /* Size of zAppend in bytes (or -1) */
){
if( nAppend<0 ){
nAppend = (int)strlen(zAppend);
}
/* If there is insufficient space allocated at StrBuffer.z, use realloc()
** to grow the buffer until so that it is big enough to accomadate the
** appended data.
*/
if( pStr->n+nAppend+1>=pStr->nAlloc ){
sqlite3_int64 nAlloc = pStr->nAlloc+(sqlite3_int64)nAppend+100;
char *zNew = sqlite3_realloc64(pStr->z, nAlloc);
if( !zNew ){
return SQLITE_NOMEM;
}
pStr->z = zNew;
pStr->nAlloc = nAlloc;
}
assert( pStr->z!=0 && (pStr->nAlloc >= pStr->n+nAppend+1) );
/* Append the data to the string buffer. */
memcpy(&pStr->z[pStr->n], zAppend, nAppend);
pStr->n += nAppend;
pStr->z[pStr->n] = '\0';
return SQLITE_OK;
}
/*
** The fts3BestSnippet() function often selects snippets that end with a
** query term. That is, the final term of the snippet is always a term
** that requires highlighting. For example, if 'X' is a highlighted term
** and '.' is a non-highlighted term, BestSnippet() may select:
**
** ........X.....X
**
** This function "shifts" the beginning of the snippet forward in the
** document so that there are approximately the same number of
** non-highlighted terms to the right of the final highlighted term as there
** are to the left of the first highlighted term. For example, to this:
**
** ....X.....X....
**
** This is done as part of extracting the snippet text, not when selecting
** the snippet. Snippet selection is done based on doclists only, so there
** is no way for fts3BestSnippet() to know whether or not the document
** actually contains terms that follow the final highlighted term.
*/
static int fts3SnippetShift(
Fts3Table *pTab, /* FTS3 table snippet comes from */
int iLangid, /* Language id to use in tokenizing */
int nSnippet, /* Number of tokens desired for snippet */
const char *zDoc, /* Document text to extract snippet from */
int nDoc, /* Size of buffer zDoc in bytes */
int *piPos, /* IN/OUT: First token of snippet */
u64 *pHlmask /* IN/OUT: Mask of tokens to highlight */
){
u64 hlmask = *pHlmask; /* Local copy of initial highlight-mask */
if( hlmask ){
int nLeft; /* Tokens to the left of first highlight */
int nRight; /* Tokens to the right of last highlight */
int nDesired; /* Ideal number of tokens to shift forward */
for(nLeft=0; !(hlmask & ((u64)1 << nLeft)); nLeft++);
for(nRight=0; !(hlmask & ((u64)1 << (nSnippet-1-nRight))); nRight++);
assert( (nSnippet-1-nRight)<=63 && (nSnippet-1-nRight)>=0 );
nDesired = (nLeft-nRight)/2;
/* Ideally, the start of the snippet should be pushed forward in the
** document nDesired tokens. This block checks if there are actually
** nDesired tokens to the right of the snippet. If so, *piPos and
** *pHlMask are updated to shift the snippet nDesired tokens to the
** right. Otherwise, the snippet is shifted by the number of tokens
** available.
*/
if( nDesired>0 ){
int nShift; /* Number of tokens to shift snippet by */
int iCurrent = 0; /* Token counter */
int rc; /* Return Code */
sqlite3_tokenizer_module *pMod;
sqlite3_tokenizer_cursor *pC;
pMod = (sqlite3_tokenizer_module *)pTab->pTokenizer->pModule;
/* Open a cursor on zDoc/nDoc. Check if there are (nSnippet+nDesired)
** or more tokens in zDoc/nDoc.
*/
rc = sqlite3Fts3OpenTokenizer(pTab->pTokenizer, iLangid, zDoc, nDoc, &pC);
if( rc!=SQLITE_OK ){
return rc;
}
while( rc==SQLITE_OK && iCurrent<(nSnippet+nDesired) ){
const char *ZDUMMY; int DUMMY1 = 0, DUMMY2 = 0, DUMMY3 = 0;
rc = pMod->xNext(pC, &ZDUMMY, &DUMMY1, &DUMMY2, &DUMMY3, &iCurrent);
}
pMod->xClose(pC);
if( rc!=SQLITE_OK && rc!=SQLITE_DONE ){ return rc; }
nShift = (rc==SQLITE_DONE)+iCurrent-nSnippet;
assert( nShift<=nDesired );
if( nShift>0 ){
*piPos += nShift;
*pHlmask = hlmask >> nShift;
}
}
}
return SQLITE_OK;
}
/*
** Extract the snippet text for fragment pFragment from cursor pCsr and
** append it to string buffer pOut.
*/
static int fts3SnippetText(
Fts3Cursor *pCsr, /* FTS3 Cursor */
SnippetFragment *pFragment, /* Snippet to extract */
int iFragment, /* Fragment number */
int isLast, /* True for final fragment in snippet */
int nSnippet, /* Number of tokens in extracted snippet */
const char *zOpen, /* String inserted before highlighted term */
const char *zClose, /* String inserted after highlighted term */
const char *zEllipsis, /* String inserted between snippets */
StrBuffer *pOut /* Write output here */
){
Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
int rc; /* Return code */
const char *zDoc; /* Document text to extract snippet from */
int nDoc; /* Size of zDoc in bytes */
int iCurrent = 0; /* Current token number of document */
int iEnd = 0; /* Byte offset of end of current token */
int isShiftDone = 0; /* True after snippet is shifted */
int iPos = pFragment->iPos; /* First token of snippet */
u64 hlmask = pFragment->hlmask; /* Highlight-mask for snippet */
int iCol = pFragment->iCol+1; /* Query column to extract text from */
sqlite3_tokenizer_module *pMod; /* Tokenizer module methods object */
sqlite3_tokenizer_cursor *pC; /* Tokenizer cursor open on zDoc/nDoc */
zDoc = (const char *)sqlite3_column_text(pCsr->pStmt, iCol);
if( zDoc==0 ){
if( sqlite3_column_type(pCsr->pStmt, iCol)!=SQLITE_NULL ){
return SQLITE_NOMEM;
}
return SQLITE_OK;
}
nDoc = sqlite3_column_bytes(pCsr->pStmt, iCol);
/* Open a token cursor on the document. */
pMod = (sqlite3_tokenizer_module *)pTab->pTokenizer->pModule;
rc = sqlite3Fts3OpenTokenizer(pTab->pTokenizer, pCsr->iLangid, zDoc,nDoc,&pC);
if( rc!=SQLITE_OK ){
return rc;
}
while( rc==SQLITE_OK ){
const char *ZDUMMY; /* Dummy argument used with tokenizer */
int DUMMY1 = -1; /* Dummy argument used with tokenizer */
int iBegin = 0; /* Offset in zDoc of start of token */
int iFin = 0; /* Offset in zDoc of end of token */
int isHighlight = 0; /* True for highlighted terms */
/* Variable DUMMY1 is initialized to a negative value above. Elsewhere
** in the FTS code the variable that the third argument to xNext points to
** is initialized to zero before the first (*but not necessarily
** subsequent*) call to xNext(). This is done for a particular application
** that needs to know whether or not the tokenizer is being used for
** snippet generation or for some other purpose.
**
** Extreme care is required when writing code to depend on this
** initialization. It is not a documented part of the tokenizer interface.
** If a tokenizer is used directly by any code outside of FTS, this
** convention might not be respected. */
rc = pMod->xNext(pC, &ZDUMMY, &DUMMY1, &iBegin, &iFin, &iCurrent);
if( rc!=SQLITE_OK ){
if( rc==SQLITE_DONE ){
/* Special case - the last token of the snippet is also the last token
** of the column. Append any punctuation that occurred between the end
** of the previous token and the end of the document to the output.
** Then break out of the loop. */
rc = fts3StringAppend(pOut, &zDoc[iEnd], -1);
}
break;
}
if( iCurrent<iPos ){ continue; }
if( !isShiftDone ){
int n = nDoc - iBegin;
rc = fts3SnippetShift(
pTab, pCsr->iLangid, nSnippet, &zDoc[iBegin], n, &iPos, &hlmask
);
isShiftDone = 1;
/* Now that the shift has been done, check if the initial "..." are
** required. They are required if (a) this is not the first fragment,
** or (b) this fragment does not begin at position 0 of its column.
*/
if( rc==SQLITE_OK ){
if( iPos>0 || iFragment>0 ){
rc = fts3StringAppend(pOut, zEllipsis, -1);
}else if( iBegin ){
rc = fts3StringAppend(pOut, zDoc, iBegin);
}
}
if( rc!=SQLITE_OK || iCurrent<iPos ) continue;
}
if( iCurrent>=(iPos+nSnippet) ){
if( isLast ){
rc = fts3StringAppend(pOut, zEllipsis, -1);
}
break;
}
/* Set isHighlight to true if this term should be highlighted. */
isHighlight = (hlmask & ((u64)1 << (iCurrent-iPos)))!=0;
if( iCurrent>iPos ) rc = fts3StringAppend(pOut, &zDoc[iEnd], iBegin-iEnd);
if( rc==SQLITE_OK && isHighlight ) rc = fts3StringAppend(pOut, zOpen, -1);
if( rc==SQLITE_OK ) rc = fts3StringAppend(pOut, &zDoc[iBegin], iFin-iBegin);
if( rc==SQLITE_OK && isHighlight ) rc = fts3StringAppend(pOut, zClose, -1);
iEnd = iFin;
}
pMod->xClose(pC);
return rc;
}
/*
** This function is used to count the entries in a column-list (a
** delta-encoded list of term offsets within a single column of a single
** row). When this function is called, *ppCollist should point to the
** beginning of the first varint in the column-list (the varint that
** contains the position of the first matching term in the column data).
** Before returning, *ppCollist is set to point to the first byte after
** the last varint in the column-list (either the 0x00 signifying the end
** of the position-list, or the 0x01 that precedes the column number of
** the next column in the position-list).
**
** The number of elements in the column-list is returned.
*/
static int fts3ColumnlistCount(char **ppCollist){
char *pEnd = *ppCollist;
char c = 0;
int nEntry = 0;
/* A column-list is terminated by either a 0x01 or 0x00. */
while( 0xFE & (*pEnd | c) ){
c = *pEnd++ & 0x80;
if( !c ) nEntry++;
}
*ppCollist = pEnd;
return nEntry;
}
/*
** This function gathers 'y' or 'b' data for a single phrase.
*/
static int fts3ExprLHits(
Fts3Expr *pExpr, /* Phrase expression node */
MatchInfo *p /* Matchinfo context */
){
Fts3Table *pTab = (Fts3Table *)p->pCursor->base.pVtab;
int iStart;
Fts3Phrase *pPhrase = pExpr->pPhrase;
char *pIter = pPhrase->doclist.pList;
int iCol = 0;
assert( p->flag==FTS3_MATCHINFO_LHITS_BM || p->flag==FTS3_MATCHINFO_LHITS );
if( p->flag==FTS3_MATCHINFO_LHITS ){
iStart = pExpr->iPhrase * p->nCol;
}else{
iStart = pExpr->iPhrase * ((p->nCol + 31) / 32);
}
if( pIter ) while( 1 ){
int nHit = fts3ColumnlistCount(&pIter);
if( (pPhrase->iColumn>=pTab->nColumn || pPhrase->iColumn==iCol) ){
if( p->flag==FTS3_MATCHINFO_LHITS ){
p->aMatchinfo[iStart + iCol] = (u32)nHit;
}else if( nHit ){
p->aMatchinfo[iStart + (iCol+1)/32] |= (1 << (iCol&0x1F));
}
}
assert( *pIter==0x00 || *pIter==0x01 );
if( *pIter!=0x01 ) break;
pIter++;
pIter += fts3GetVarint32(pIter, &iCol);
if( iCol>=p->nCol ) return FTS_CORRUPT_VTAB;
}
return SQLITE_OK;
}
/*
** Gather the results for matchinfo directives 'y' and 'b'.
*/
static int fts3ExprLHitGather(
Fts3Expr *pExpr,
MatchInfo *p
){
int rc = SQLITE_OK;
assert( (pExpr->pLeft==0)==(pExpr->pRight==0) );
if( pExpr->bEof==0 && pExpr->iDocid==p->pCursor->iPrevId ){
if( pExpr->pLeft ){
rc = fts3ExprLHitGather(pExpr->pLeft, p);
if( rc==SQLITE_OK ) rc = fts3ExprLHitGather(pExpr->pRight, p);
}else{
rc = fts3ExprLHits(pExpr, p);
}
}
return rc;
}
/*
** fts3ExprIterate() callback used to collect the "global" matchinfo stats
** for a single query.
**
** fts3ExprIterate() callback to load the 'global' elements of a
** FTS3_MATCHINFO_HITS matchinfo array. The global stats are those elements
** of the matchinfo array that are constant for all rows returned by the
** current query.
**
** Argument pCtx is actually a pointer to a struct of type MatchInfo. This
** function populates Matchinfo.aMatchinfo[] as follows:
**
** for(iCol=0; iCol<nCol; iCol++){
** aMatchinfo[3*iPhrase*nCol + 3*iCol + 1] = X;
** aMatchinfo[3*iPhrase*nCol + 3*iCol + 2] = Y;
** }
**
** where X is the number of matches for phrase iPhrase is column iCol of all
** rows of the table. Y is the number of rows for which column iCol contains
** at least one instance of phrase iPhrase.
**
** If the phrase pExpr consists entirely of deferred tokens, then all X and
** Y values are set to nDoc, where nDoc is the number of documents in the
** file system. This is done because the full-text index doclist is required
** to calculate these values properly, and the full-text index doclist is
** not available for deferred tokens.
*/
static int fts3ExprGlobalHitsCb(
Fts3Expr *pExpr, /* Phrase expression node */
int iPhrase, /* Phrase number (numbered from zero) */
void *pCtx /* Pointer to MatchInfo structure */
){
MatchInfo *p = (MatchInfo *)pCtx;
return sqlite3Fts3EvalPhraseStats(
p->pCursor, pExpr, &p->aMatchinfo[3*iPhrase*p->nCol]
);
}
/*
** fts3ExprIterate() callback used to collect the "local" part of the
** FTS3_MATCHINFO_HITS array. The local stats are those elements of the
** array that are different for each row returned by the query.
*/
static int fts3ExprLocalHitsCb(
Fts3Expr *pExpr, /* Phrase expression node */
int iPhrase, /* Phrase number */
void *pCtx /* Pointer to MatchInfo structure */
){
int rc = SQLITE_OK;
MatchInfo *p = (MatchInfo *)pCtx;
int iStart = iPhrase * p->nCol * 3;
int i;
for(i=0; i<p->nCol && rc==SQLITE_OK; i++){
char *pCsr;
rc = sqlite3Fts3EvalPhrasePoslist(p->pCursor, pExpr, i, &pCsr);
if( pCsr ){
p->aMatchinfo[iStart+i*3] = fts3ColumnlistCount(&pCsr);
}else{
p->aMatchinfo[iStart+i*3] = 0;
}
}
return rc;
}
static int fts3MatchinfoCheck(
Fts3Table *pTab,
char cArg,
char **pzErr
){
if( (cArg==FTS3_MATCHINFO_NPHRASE)
|| (cArg==FTS3_MATCHINFO_NCOL)
|| (cArg==FTS3_MATCHINFO_NDOC && pTab->bFts4)
|| (cArg==FTS3_MATCHINFO_AVGLENGTH && pTab->bFts4)
|| (cArg==FTS3_MATCHINFO_LENGTH && pTab->bHasDocsize)
|| (cArg==FTS3_MATCHINFO_LCS)
|| (cArg==FTS3_MATCHINFO_HITS)
|| (cArg==FTS3_MATCHINFO_LHITS)
|| (cArg==FTS3_MATCHINFO_LHITS_BM)
){
return SQLITE_OK;
}
sqlite3Fts3ErrMsg(pzErr, "unrecognized matchinfo request: %c", cArg);
return SQLITE_ERROR;
}
static size_t fts3MatchinfoSize(MatchInfo *pInfo, char cArg){
size_t nVal; /* Number of integers output by cArg */
switch( cArg ){
case FTS3_MATCHINFO_NDOC:
case FTS3_MATCHINFO_NPHRASE:
case FTS3_MATCHINFO_NCOL:
nVal = 1;
break;
case FTS3_MATCHINFO_AVGLENGTH:
case FTS3_MATCHINFO_LENGTH:
case FTS3_MATCHINFO_LCS:
nVal = pInfo->nCol;
break;
case FTS3_MATCHINFO_LHITS:
nVal = pInfo->nCol * pInfo->nPhrase;
break;
case FTS3_MATCHINFO_LHITS_BM:
nVal = pInfo->nPhrase * ((pInfo->nCol + 31) / 32);
break;
default:
assert( cArg==FTS3_MATCHINFO_HITS );
nVal = pInfo->nCol * pInfo->nPhrase * 3;
break;
}
return nVal;
}
static int fts3MatchinfoSelectDoctotal(
Fts3Table *pTab,
sqlite3_stmt **ppStmt,
sqlite3_int64 *pnDoc,
const char **paLen,
const char **ppEnd
){
sqlite3_stmt *pStmt;
const char *a;
const char *pEnd;
sqlite3_int64 nDoc;
int n;
if( !*ppStmt ){
int rc = sqlite3Fts3SelectDoctotal(pTab, ppStmt);
if( rc!=SQLITE_OK ) return rc;
}
pStmt = *ppStmt;
assert( sqlite3_data_count(pStmt)==1 );
n = sqlite3_column_bytes(pStmt, 0);
a = sqlite3_column_blob(pStmt, 0);
if( a==0 ){
return FTS_CORRUPT_VTAB;
}
pEnd = a + n;
a += sqlite3Fts3GetVarintBounded(a, pEnd, &nDoc);
if( nDoc<=0 || a>pEnd ){
return FTS_CORRUPT_VTAB;
}
*pnDoc = nDoc;
if( paLen ) *paLen = a;
if( ppEnd ) *ppEnd = pEnd;
return SQLITE_OK;
}
/*
** An instance of the following structure is used to store state while
** iterating through a multi-column position-list corresponding to the
** hits for a single phrase on a single row in order to calculate the
** values for a matchinfo() FTS3_MATCHINFO_LCS request.
*/
typedef struct LcsIterator LcsIterator;
struct LcsIterator {
Fts3Expr *pExpr; /* Pointer to phrase expression */
int iPosOffset; /* Tokens count up to end of this phrase */
char *pRead; /* Cursor used to iterate through aDoclist */
int iPos; /* Current position */
};
/*
** If LcsIterator.iCol is set to the following value, the iterator has
** finished iterating through all offsets for all columns.
*/
#define LCS_ITERATOR_FINISHED 0x7FFFFFFF;
static int fts3MatchinfoLcsCb(
Fts3Expr *pExpr, /* Phrase expression node */
int iPhrase, /* Phrase number (numbered from zero) */
void *pCtx /* Pointer to MatchInfo structure */
){
LcsIterator *aIter = (LcsIterator *)pCtx;
aIter[iPhrase].pExpr = pExpr;
return SQLITE_OK;
}
/*
** Advance the iterator passed as an argument to the next position. Return
** 1 if the iterator is at EOF or if it now points to the start of the
** position list for the next column.
*/
static int fts3LcsIteratorAdvance(LcsIterator *pIter){
char *pRead;
sqlite3_int64 iRead;
int rc = 0;
if( NEVER(pIter==0) ) return 1;
pRead = pIter->pRead;
pRead += sqlite3Fts3GetVarint(pRead, &iRead);
if( iRead==0 || iRead==1 ){
pRead = 0;
rc = 1;
}else{
pIter->iPos += (int)(iRead-2);
}
pIter->pRead = pRead;
return rc;
}
/*
** This function implements the FTS3_MATCHINFO_LCS matchinfo() flag.
**
** If the call is successful, the longest-common-substring lengths for each
** column are written into the first nCol elements of the pInfo->aMatchinfo[]
** array before returning. SQLITE_OK is returned in this case.
**
** Otherwise, if an error occurs, an SQLite error code is returned and the
** data written to the first nCol elements of pInfo->aMatchinfo[] is
** undefined.
*/
static int fts3MatchinfoLcs(Fts3Cursor *pCsr, MatchInfo *pInfo){
LcsIterator *aIter;
int i;
int iCol;
int nToken = 0;
int rc = SQLITE_OK;
/* Allocate and populate the array of LcsIterator objects. The array
** contains one element for each matchable phrase in the query.
**/
aIter = sqlite3Fts3MallocZero(sizeof(LcsIterator) * pCsr->nPhrase);
if( !aIter ) return SQLITE_NOMEM;
(void)fts3ExprIterate(pCsr->pExpr, fts3MatchinfoLcsCb, (void*)aIter);
for(i=0; i<pInfo->nPhrase; i++){
LcsIterator *pIter = &aIter[i];
nToken -= pIter->pExpr->pPhrase->nToken;
pIter->iPosOffset = nToken;
}
for(iCol=0; iCol<pInfo->nCol; iCol++){
int nLcs = 0; /* LCS value for this column */
int nLive = 0; /* Number of iterators in aIter not at EOF */
for(i=0; i<pInfo->nPhrase; i++){
LcsIterator *pIt = &aIter[i];
rc = sqlite3Fts3EvalPhrasePoslist(pCsr, pIt->pExpr, iCol, &pIt->pRead);
if( rc!=SQLITE_OK ) goto matchinfo_lcs_out;
if( pIt->pRead ){
pIt->iPos = pIt->iPosOffset;
fts3LcsIteratorAdvance(pIt);
if( pIt->pRead==0 ){
rc = FTS_CORRUPT_VTAB;
goto matchinfo_lcs_out;
}
nLive++;
}
}
while( nLive>0 ){
LcsIterator *pAdv = 0; /* The iterator to advance by one position */
int nThisLcs = 0; /* LCS for the current iterator positions */
for(i=0; i<pInfo->nPhrase; i++){
LcsIterator *pIter = &aIter[i];
if( pIter->pRead==0 ){
/* This iterator is already at EOF for this column. */
nThisLcs = 0;
}else{
if( pAdv==0 || pIter->iPos<pAdv->iPos ){
pAdv = pIter;
}
if( nThisLcs==0 || pIter->iPos==pIter[-1].iPos ){
nThisLcs++;
}else{
nThisLcs = 1;
}
if( nThisLcs>nLcs ) nLcs = nThisLcs;
}
}
if( fts3LcsIteratorAdvance(pAdv) ) nLive--;
}
pInfo->aMatchinfo[iCol] = nLcs;
}
matchinfo_lcs_out:
sqlite3_free(aIter);
return rc;
}
/*
** Populate the buffer pInfo->aMatchinfo[] with an array of integers to
** be returned by the matchinfo() function. Argument zArg contains the
** format string passed as the second argument to matchinfo (or the
** default value "pcx" if no second argument was specified). The format
** string has already been validated and the pInfo->aMatchinfo[] array
** is guaranteed to be large enough for the output.
**
** If bGlobal is true, then populate all fields of the matchinfo() output.
** If it is false, then assume that those fields that do not change between
** rows (i.e. FTS3_MATCHINFO_NPHRASE, NCOL, NDOC, AVGLENGTH and part of HITS)
** have already been populated.
**
** Return SQLITE_OK if successful, or an SQLite error code if an error
** occurs. If a value other than SQLITE_OK is returned, the state the
** pInfo->aMatchinfo[] buffer is left in is undefined.
*/
static int fts3MatchinfoValues(
Fts3Cursor *pCsr, /* FTS3 cursor object */
int bGlobal, /* True to grab the global stats */
MatchInfo *pInfo, /* Matchinfo context object */
const char *zArg /* Matchinfo format string */
){
int rc = SQLITE_OK;
int i;
Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
sqlite3_stmt *pSelect = 0;
for(i=0; rc==SQLITE_OK && zArg[i]; i++){
pInfo->flag = zArg[i];
switch( zArg[i] ){
case FTS3_MATCHINFO_NPHRASE:
if( bGlobal ) pInfo->aMatchinfo[0] = pInfo->nPhrase;
break;
case FTS3_MATCHINFO_NCOL:
if( bGlobal ) pInfo->aMatchinfo[0] = pInfo->nCol;
break;
case FTS3_MATCHINFO_NDOC:
if( bGlobal ){
sqlite3_int64 nDoc = 0;
rc = fts3MatchinfoSelectDoctotal(pTab, &pSelect, &nDoc, 0, 0);
pInfo->aMatchinfo[0] = (u32)nDoc;
}
break;
case FTS3_MATCHINFO_AVGLENGTH:
if( bGlobal ){
sqlite3_int64 nDoc; /* Number of rows in table */
const char *a; /* Aggregate column length array */
const char *pEnd; /* First byte past end of length array */
rc = fts3MatchinfoSelectDoctotal(pTab, &pSelect, &nDoc, &a, &pEnd);
if( rc==SQLITE_OK ){
int iCol;
for(iCol=0; iCol<pInfo->nCol; iCol++){
u32 iVal;
sqlite3_int64 nToken;
a += sqlite3Fts3GetVarint(a, &nToken);
if( a>pEnd ){
rc = SQLITE_CORRUPT_VTAB;
break;
}
iVal = (u32)(((u32)(nToken&0xffffffff)+nDoc/2)/nDoc);
pInfo->aMatchinfo[iCol] = iVal;
}
}
}
break;
case FTS3_MATCHINFO_LENGTH: {
sqlite3_stmt *pSelectDocsize = 0;
rc = sqlite3Fts3SelectDocsize(pTab, pCsr->iPrevId, &pSelectDocsize);
if( rc==SQLITE_OK ){
int iCol;
const char *a = sqlite3_column_blob(pSelectDocsize, 0);
const char *pEnd = a + sqlite3_column_bytes(pSelectDocsize, 0);
for(iCol=0; iCol<pInfo->nCol; iCol++){
sqlite3_int64 nToken;
a += sqlite3Fts3GetVarintBounded(a, pEnd, &nToken);
if( a>pEnd ){
rc = SQLITE_CORRUPT_VTAB;
break;
}
pInfo->aMatchinfo[iCol] = (u32)nToken;
}
}
sqlite3_reset(pSelectDocsize);
break;
}
case FTS3_MATCHINFO_LCS:
rc = fts3ExprLoadDoclists(pCsr, 0, 0);
if( rc==SQLITE_OK ){
rc = fts3MatchinfoLcs(pCsr, pInfo);
}
break;
case FTS3_MATCHINFO_LHITS_BM:
case FTS3_MATCHINFO_LHITS: {
size_t nZero = fts3MatchinfoSize(pInfo, zArg[i]) * sizeof(u32);
memset(pInfo->aMatchinfo, 0, nZero);
rc = fts3ExprLHitGather(pCsr->pExpr, pInfo);
break;
}
default: {
Fts3Expr *pExpr;
assert( zArg[i]==FTS3_MATCHINFO_HITS );
pExpr = pCsr->pExpr;
rc = fts3ExprLoadDoclists(pCsr, 0, 0);
if( rc!=SQLITE_OK ) break;
if( bGlobal ){
if( pCsr->pDeferred ){
rc = fts3MatchinfoSelectDoctotal(pTab, &pSelect, &pInfo->nDoc,0,0);
if( rc!=SQLITE_OK ) break;
}
rc = fts3ExprIterate(pExpr, fts3ExprGlobalHitsCb,(void*)pInfo);
sqlite3Fts3EvalTestDeferred(pCsr, &rc);
if( rc!=SQLITE_OK ) break;
}
(void)fts3ExprIterate(pExpr, fts3ExprLocalHitsCb,(void*)pInfo);
break;
}
}
pInfo->aMatchinfo += fts3MatchinfoSize(pInfo, zArg[i]);
}
sqlite3_reset(pSelect);
return rc;
}
/*
** Populate pCsr->aMatchinfo[] with data for the current row. The
** 'matchinfo' data is an array of 32-bit unsigned integers (C type u32).
*/
static void fts3GetMatchinfo(
sqlite3_context *pCtx, /* Return results here */
Fts3Cursor *pCsr, /* FTS3 Cursor object */
const char *zArg /* Second argument to matchinfo() function */
){
MatchInfo sInfo;
Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
int rc = SQLITE_OK;
int bGlobal = 0; /* Collect 'global' stats as well as local */
u32 *aOut = 0;
void (*xDestroyOut)(void*) = 0;
memset(&sInfo, 0, sizeof(MatchInfo));
sInfo.pCursor = pCsr;
sInfo.nCol = pTab->nColumn;
/* If there is cached matchinfo() data, but the format string for the
** cache does not match the format string for this request, discard
** the cached data. */
if( pCsr->pMIBuffer && strcmp(pCsr->pMIBuffer->zMatchinfo, zArg) ){
sqlite3Fts3MIBufferFree(pCsr->pMIBuffer);
pCsr->pMIBuffer = 0;
}
/* If Fts3Cursor.pMIBuffer is NULL, then this is the first time the
** matchinfo function has been called for this query. In this case
** allocate the array used to accumulate the matchinfo data and
** initialize those elements that are constant for every row.
*/
if( pCsr->pMIBuffer==0 ){
size_t nMatchinfo = 0; /* Number of u32 elements in match-info */
int i; /* Used to iterate through zArg */
/* Determine the number of phrases in the query */
pCsr->nPhrase = fts3ExprPhraseCount(pCsr->pExpr);
sInfo.nPhrase = pCsr->nPhrase;
/* Determine the number of integers in the buffer returned by this call. */
for(i=0; zArg[i]; i++){
char *zErr = 0;
if( fts3MatchinfoCheck(pTab, zArg[i], &zErr) ){
sqlite3_result_error(pCtx, zErr, -1);
sqlite3_free(zErr);
return;
}
nMatchinfo += fts3MatchinfoSize(&sInfo, zArg[i]);
}
/* Allocate space for Fts3Cursor.aMatchinfo[] and Fts3Cursor.zMatchinfo. */
pCsr->pMIBuffer = fts3MIBufferNew(nMatchinfo, zArg);
if( !pCsr->pMIBuffer ) rc = SQLITE_NOMEM;
pCsr->isMatchinfoNeeded = 1;
bGlobal = 1;
}
if( rc==SQLITE_OK ){
xDestroyOut = fts3MIBufferAlloc(pCsr->pMIBuffer, &aOut);
if( xDestroyOut==0 ){
rc = SQLITE_NOMEM;
}
}
if( rc==SQLITE_OK ){
sInfo.aMatchinfo = aOut;
sInfo.nPhrase = pCsr->nPhrase;
rc = fts3MatchinfoValues(pCsr, bGlobal, &sInfo, zArg);
if( bGlobal ){
fts3MIBufferSetGlobal(pCsr->pMIBuffer);
}
}
if( rc!=SQLITE_OK ){
sqlite3_result_error_code(pCtx, rc);
if( xDestroyOut ) xDestroyOut(aOut);
}else{
int n = pCsr->pMIBuffer->nElem * sizeof(u32);
sqlite3_result_blob(pCtx, aOut, n, xDestroyOut);
}
}
/*
** Implementation of snippet() function.
*/
void sqlite3Fts3Snippet(
sqlite3_context *pCtx, /* SQLite function call context */
Fts3Cursor *pCsr, /* Cursor object */
const char *zStart, /* Snippet start text - "<b>" */
const char *zEnd, /* Snippet end text - "</b>" */
const char *zEllipsis, /* Snippet ellipsis text - "<b>...</b>" */
int iCol, /* Extract snippet from this column */
int nToken /* Approximate number of tokens in snippet */
){
Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
int rc = SQLITE_OK;
int i;
StrBuffer res = {0, 0, 0};
/* The returned text includes up to four fragments of text extracted from
** the data in the current row. The first iteration of the for(...) loop
** below attempts to locate a single fragment of text nToken tokens in
** size that contains at least one instance of all phrases in the query
** expression that appear in the current row. If such a fragment of text
** cannot be found, the second iteration of the loop attempts to locate
** a pair of fragments, and so on.
*/
int nSnippet = 0; /* Number of fragments in this snippet */
SnippetFragment aSnippet[4]; /* Maximum of 4 fragments per snippet */
int nFToken = -1; /* Number of tokens in each fragment */
if( !pCsr->pExpr ){
sqlite3_result_text(pCtx, "", 0, SQLITE_STATIC);
return;
}
/* Limit the snippet length to 64 tokens. */
if( nToken<-64 ) nToken = -64;
if( nToken>+64 ) nToken = +64;
for(nSnippet=1; 1; nSnippet++){
int iSnip; /* Loop counter 0..nSnippet-1 */
u64 mCovered = 0; /* Bitmask of phrases covered by snippet */
u64 mSeen = 0; /* Bitmask of phrases seen by BestSnippet() */
if( nToken>=0 ){
nFToken = (nToken+nSnippet-1) / nSnippet;
}else{
nFToken = -1 * nToken;
}
for(iSnip=0; iSnip<nSnippet; iSnip++){
int iBestScore = -1; /* Best score of columns checked so far */
int iRead; /* Used to iterate through columns */
SnippetFragment *pFragment = &aSnippet[iSnip];
memset(pFragment, 0, sizeof(*pFragment));
/* Loop through all columns of the table being considered for snippets.
** If the iCol argument to this function was negative, this means all
** columns of the FTS3 table. Otherwise, only column iCol is considered.
*/
for(iRead=0; iRead<pTab->nColumn; iRead++){
SnippetFragment sF = {0, 0, 0, 0};
int iS = 0;
if( iCol>=0 && iRead!=iCol ) continue;
/* Find the best snippet of nFToken tokens in column iRead. */
rc = fts3BestSnippet(nFToken, pCsr, iRead, mCovered, &mSeen, &sF, &iS);
if( rc!=SQLITE_OK ){
goto snippet_out;
}
if( iS>iBestScore ){
*pFragment = sF;
iBestScore = iS;
}
}
mCovered |= pFragment->covered;
}
/* If all query phrases seen by fts3BestSnippet() are present in at least
** one of the nSnippet snippet fragments, break out of the loop.
*/
assert( (mCovered&mSeen)==mCovered );
if( mSeen==mCovered || nSnippet==SizeofArray(aSnippet) ) break;
}
assert( nFToken>0 );
for(i=0; i<nSnippet && rc==SQLITE_OK; i++){
rc = fts3SnippetText(pCsr, &aSnippet[i],
i, (i==nSnippet-1), nFToken, zStart, zEnd, zEllipsis, &res
);
}
snippet_out:
sqlite3Fts3SegmentsClose(pTab);
if( rc!=SQLITE_OK ){
sqlite3_result_error_code(pCtx, rc);
sqlite3_free(res.z);
}else{
sqlite3_result_text(pCtx, res.z, -1, sqlite3_free);
}
}
typedef struct TermOffset TermOffset;
typedef struct TermOffsetCtx TermOffsetCtx;
struct TermOffset {
char *pList; /* Position-list */
i64 iPos; /* Position just read from pList */
i64 iOff; /* Offset of this term from read positions */
};
struct TermOffsetCtx {
Fts3Cursor *pCsr;
int iCol; /* Column of table to populate aTerm for */
int iTerm;
sqlite3_int64 iDocid;
TermOffset *aTerm;
};
/*
** This function is an fts3ExprIterate() callback used by sqlite3Fts3Offsets().
*/
static int fts3ExprTermOffsetInit(Fts3Expr *pExpr, int iPhrase, void *ctx){
TermOffsetCtx *p = (TermOffsetCtx *)ctx;
int nTerm; /* Number of tokens in phrase */
int iTerm; /* For looping through nTerm phrase terms */
char *pList; /* Pointer to position list for phrase */
i64 iPos = 0; /* First position in position-list */
int rc;
UNUSED_PARAMETER(iPhrase);
rc = sqlite3Fts3EvalPhrasePoslist(p->pCsr, pExpr, p->iCol, &pList);
nTerm = pExpr->pPhrase->nToken;
if( pList ){
fts3GetDeltaPosition(&pList, &iPos);
assert_fts3_nc( iPos>=0 );
}
for(iTerm=0; iTerm<nTerm; iTerm++){
TermOffset *pT = &p->aTerm[p->iTerm++];
pT->iOff = nTerm-iTerm-1;
pT->pList = pList;
pT->iPos = iPos;
}
return rc;
}
/*
** Implementation of offsets() function.
*/
void sqlite3Fts3Offsets(
sqlite3_context *pCtx, /* SQLite function call context */
Fts3Cursor *pCsr /* Cursor object */
){
Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
sqlite3_tokenizer_module const *pMod = pTab->pTokenizer->pModule;
int rc; /* Return Code */
int nToken; /* Number of tokens in query */
int iCol; /* Column currently being processed */
StrBuffer res = {0, 0, 0}; /* Result string */
TermOffsetCtx sCtx; /* Context for fts3ExprTermOffsetInit() */
if( !pCsr->pExpr ){
sqlite3_result_text(pCtx, "", 0, SQLITE_STATIC);
return;
}
memset(&sCtx, 0, sizeof(sCtx));
assert( pCsr->isRequireSeek==0 );
/* Count the number of terms in the query */
rc = fts3ExprLoadDoclists(pCsr, 0, &nToken);
if( rc!=SQLITE_OK ) goto offsets_out;
/* Allocate the array of TermOffset iterators. */
sCtx.aTerm = (TermOffset *)sqlite3Fts3MallocZero(sizeof(TermOffset)*nToken);
if( 0==sCtx.aTerm ){
rc = SQLITE_NOMEM;
goto offsets_out;
}
sCtx.iDocid = pCsr->iPrevId;
sCtx.pCsr = pCsr;
/* Loop through the table columns, appending offset information to
** string-buffer res for each column.
*/
for(iCol=0; iCol<pTab->nColumn; iCol++){
sqlite3_tokenizer_cursor *pC; /* Tokenizer cursor */
const char *ZDUMMY; /* Dummy argument used with xNext() */
int NDUMMY = 0; /* Dummy argument used with xNext() */
int iStart = 0;
int iEnd = 0;
int iCurrent = 0;
const char *zDoc;
int nDoc;
/* Initialize the contents of sCtx.aTerm[] for column iCol. This
** operation may fail if the database contains corrupt records.
*/
sCtx.iCol = iCol;
sCtx.iTerm = 0;
rc = fts3ExprIterate(pCsr->pExpr, fts3ExprTermOffsetInit, (void*)&sCtx);
if( rc!=SQLITE_OK ) goto offsets_out;
/* Retreive the text stored in column iCol. If an SQL NULL is stored
** in column iCol, jump immediately to the next iteration of the loop.
** If an OOM occurs while retrieving the data (this can happen if SQLite
** needs to transform the data from utf-16 to utf-8), return SQLITE_NOMEM
** to the caller.
*/
zDoc = (const char *)sqlite3_column_text(pCsr->pStmt, iCol+1);
nDoc = sqlite3_column_bytes(pCsr->pStmt, iCol+1);
if( zDoc==0 ){
if( sqlite3_column_type(pCsr->pStmt, iCol+1)==SQLITE_NULL ){
continue;
}
rc = SQLITE_NOMEM;
goto offsets_out;
}
/* Initialize a tokenizer iterator to iterate through column iCol. */
rc = sqlite3Fts3OpenTokenizer(pTab->pTokenizer, pCsr->iLangid,
zDoc, nDoc, &pC
);
if( rc!=SQLITE_OK ) goto offsets_out;
rc = pMod->xNext(pC, &ZDUMMY, &NDUMMY, &iStart, &iEnd, &iCurrent);
while( rc==SQLITE_OK ){
int i; /* Used to loop through terms */
int iMinPos = 0x7FFFFFFF; /* Position of next token */
TermOffset *pTerm = 0; /* TermOffset associated with next token */
for(i=0; i<nToken; i++){
TermOffset *pT = &sCtx.aTerm[i];
if( pT->pList && (pT->iPos-pT->iOff)<iMinPos ){
iMinPos = pT->iPos-pT->iOff;
pTerm = pT;
}
}
if( !pTerm ){
/* All offsets for this column have been gathered. */
rc = SQLITE_DONE;
}else{
assert_fts3_nc( iCurrent<=iMinPos );
if( 0==(0xFE&*pTerm->pList) ){
pTerm->pList = 0;
}else{
fts3GetDeltaPosition(&pTerm->pList, &pTerm->iPos);
}
while( rc==SQLITE_OK && iCurrent<iMinPos ){
rc = pMod->xNext(pC, &ZDUMMY, &NDUMMY, &iStart, &iEnd, &iCurrent);
}
if( rc==SQLITE_OK ){
char aBuffer[64];
sqlite3_snprintf(sizeof(aBuffer), aBuffer,
"%d %d %d %d ", iCol, pTerm-sCtx.aTerm, iStart, iEnd-iStart
);
rc = fts3StringAppend(&res, aBuffer, -1);
}else if( rc==SQLITE_DONE && pTab->zContentTbl==0 ){
rc = FTS_CORRUPT_VTAB;
}
}
}
if( rc==SQLITE_DONE ){
rc = SQLITE_OK;
}
pMod->xClose(pC);
if( rc!=SQLITE_OK ) goto offsets_out;
}
offsets_out:
sqlite3_free(sCtx.aTerm);
assert( rc!=SQLITE_DONE );
sqlite3Fts3SegmentsClose(pTab);
if( rc!=SQLITE_OK ){
sqlite3_result_error_code(pCtx, rc);
sqlite3_free(res.z);
}else{
sqlite3_result_text(pCtx, res.z, res.n-1, sqlite3_free);
}
return;
}
/*
** Implementation of matchinfo() function.
*/
void sqlite3Fts3Matchinfo(
sqlite3_context *pContext, /* Function call context */
Fts3Cursor *pCsr, /* FTS3 table cursor */
const char *zArg /* Second arg to matchinfo() function */
){
Fts3Table *pTab = (Fts3Table *)pCsr->base.pVtab;
const char *zFormat;
if( zArg ){
zFormat = zArg;
}else{
zFormat = FTS3_MATCHINFO_DEFAULT;
}
if( !pCsr->pExpr ){
sqlite3_result_blob(pContext, "", 0, SQLITE_STATIC);
return;
}else{
/* Retrieve matchinfo() data. */
fts3GetMatchinfo(pContext, pCsr, zFormat);
sqlite3Fts3SegmentsClose(pTab);
}
}
#endif
| 57,920 | 1,752 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/global.c | /*
** 2008 June 13
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains definitions of global variables and constants.
*/
#include "third_party/sqlite3/sqliteInt.h"
/* An array to map all upper-case characters into their corresponding
** lower-case character.
**
** SQLite only considers US-ASCII (or EBCDIC) characters. We do not
** handle case conversions for the UTF character set since the tables
** involved are nearly as big or bigger than SQLite itself.
*/
const unsigned char sqlite3UpperToLower[] = {
#ifdef SQLITE_ASCII
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 97, 98, 99,100,101,102,103,
104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,
122, 91, 92, 93, 94, 95, 96, 97, 98, 99,100,101,102,103,104,105,106,107,
108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,
126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,
162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,
180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,
198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,
216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,
234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,
252,253,254,255,
#endif
#ifdef SQLITE_EBCDIC
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* 0x */
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, /* 1x */
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, /* 2x */
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, /* 3x */
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, /* 4x */
80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, /* 5x */
96, 97, 98, 99,100,101,102,103,104,105,106,107,108,109,110,111, /* 6x */
112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127, /* 7x */
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143, /* 8x */
144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159, /* 9x */
160,161,162,163,164,165,166,167,168,169,170,171,140,141,142,175, /* Ax */
176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191, /* Bx */
192,129,130,131,132,133,134,135,136,137,202,203,204,205,206,207, /* Cx */
208,145,146,147,148,149,150,151,152,153,218,219,220,221,222,223, /* Dx */
224,225,162,163,164,165,166,167,168,169,234,235,236,237,238,239, /* Ex */
240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255, /* Fx */
#endif
/* All of the upper-to-lower conversion data is above. The following
** 18 integers are completely unrelated. They are appended to the
** sqlite3UpperToLower[] array to avoid UBSAN warnings. Here's what is
** going on:
**
** The SQL comparison operators (<>, =, >, <=, <, and >=) are implemented
** by invoking sqlite3MemCompare(A,B) which compares values A and B and
** returns negative, zero, or positive if A is less then, equal to, or
** greater than B, respectively. Then the true false results is found by
** consulting sqlite3aLTb[opcode], sqlite3aEQb[opcode], or
** sqlite3aGTb[opcode] depending on whether the result of compare(A,B)
** is negative, zero, or positive, where opcode is the specific opcode.
** The only works because the comparison opcodes are consecutive and in
** this order: NE EQ GT LE LT GE. Various assert()s throughout the code
** ensure that is the case.
**
** These elements must be appended to another array. Otherwise the
** index (here shown as [256-OP_Ne]) would be out-of-bounds and thus
** be undefined behavior. That's goofy, but the C-standards people thought
** it was a good idea, so here we are.
*/
/* NE EQ GT LE LT GE */
1, 0, 0, 1, 1, 0, /* aLTb[]: Use when compare(A,B) less than zero */
0, 1, 0, 1, 0, 1, /* aEQb[]: Use when compare(A,B) equals zero */
1, 0, 1, 0, 0, 1 /* aGTb[]: Use when compare(A,B) greater than zero*/
};
const unsigned char *sqlite3aLTb = &sqlite3UpperToLower[256-OP_Ne];
const unsigned char *sqlite3aEQb = &sqlite3UpperToLower[256+6-OP_Ne];
const unsigned char *sqlite3aGTb = &sqlite3UpperToLower[256+12-OP_Ne];
/*
** The following 256 byte lookup table is used to support SQLites built-in
** equivalents to the following standard library functions:
**
** isspace() 0x01
** isalpha() 0x02
** isdigit() 0x04
** isalnum() 0x06
** isxdigit() 0x08
** toupper() 0x20
** SQLite identifier character 0x40
** Quote character 0x80
**
** Bit 0x20 is set if the mapped character requires translation to upper
** case. i.e. if the character is a lower-case ASCII character.
** If x is a lower-case ASCII character, then its upper-case equivalent
** is (x - 0x20). Therefore toupper() can be implemented as:
**
** (x & ~(map[x]&0x20))
**
** The equivalent of tolower() is implemented using the sqlite3UpperToLower[]
** array. tolower() is used more often than toupper() by SQLite.
**
** Bit 0x40 is set if the character is non-alphanumeric and can be used in an
** SQLite identifier. Identifiers are alphanumerics, "_", "$", and any
** non-ASCII UTF character. Hence the test for whether or not a character is
** part of an identifier is 0x46.
*/
const unsigned char sqlite3CtypeMap[256] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 00..07 ........ */
0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, /* 08..0f ........ */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 10..17 ........ */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 18..1f ........ */
0x01, 0x00, 0x80, 0x00, 0x40, 0x00, 0x00, 0x80, /* 20..27 !"#$%&' */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 28..2f ()*+,-./ */
0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, /* 30..37 01234567 */
0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 38..3f 89:;<=>? */
0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x02, /* 40..47 @ABCDEFG */
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, /* 48..4f HIJKLMNO */
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, /* 50..57 PQRSTUVW */
0x02, 0x02, 0x02, 0x80, 0x00, 0x00, 0x00, 0x40, /* 58..5f XYZ[\]^_ */
0x80, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x22, /* 60..67 `abcdefg */
0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, /* 68..6f hijklmno */
0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, /* 70..77 pqrstuvw */
0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, /* 78..7f xyz{|}~. */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* 80..87 ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* 88..8f ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* 90..97 ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* 98..9f ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* a0..a7 ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* a8..af ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* b0..b7 ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* b8..bf ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* c0..c7 ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* c8..cf ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* d0..d7 ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* d8..df ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* e0..e7 ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* e8..ef ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, /* f0..f7 ........ */
0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40 /* f8..ff ........ */
};
/* EVIDENCE-OF: R-02982-34736 In order to maintain full backwards
** compatibility for legacy applications, the URI filename capability is
** disabled by default.
**
** EVIDENCE-OF: R-38799-08373 URI filenames can be enabled or disabled
** using the SQLITE_USE_URI=1 or SQLITE_USE_URI=0 compile-time options.
**
** EVIDENCE-OF: R-43642-56306 By default, URI handling is globally
** disabled. The default value may be changed by compiling with the
** SQLITE_USE_URI symbol defined.
*/
#ifndef SQLITE_USE_URI
# define SQLITE_USE_URI 0
#endif
/* EVIDENCE-OF: R-38720-18127 The default setting is determined by the
** SQLITE_ALLOW_COVERING_INDEX_SCAN compile-time option, or is "on" if
** that compile-time option is omitted.
*/
#if !defined(SQLITE_ALLOW_COVERING_INDEX_SCAN)
# define SQLITE_ALLOW_COVERING_INDEX_SCAN 1
#else
# if !SQLITE_ALLOW_COVERING_INDEX_SCAN
# error "Compile-time disabling of covering index scan using the\
-DSQLITE_ALLOW_COVERING_INDEX_SCAN=0 option is deprecated.\
Contact SQLite developers if this is a problem for you, and\
delete this #error macro to continue with your build."
# endif
#endif
/* The minimum PMA size is set to this value multiplied by the database
** page size in bytes.
*/
#ifndef SQLITE_SORTER_PMASZ
# define SQLITE_SORTER_PMASZ 250
#endif
/* Statement journals spill to disk when their size exceeds the following
** threshold (in bytes). 0 means that statement journals are created and
** written to disk immediately (the default behavior for SQLite versions
** before 3.12.0). -1 means always keep the entire statement journal in
** memory. (The statement journal is also always held entirely in memory
** if journal_mode=MEMORY or if temp_store=MEMORY, regardless of this
** setting.)
*/
#ifndef SQLITE_STMTJRNL_SPILL
# define SQLITE_STMTJRNL_SPILL (64*1024)
#endif
/*
** The default lookaside-configuration, the format "SZ,N". SZ is the
** number of bytes in each lookaside slot (should be a multiple of 8)
** and N is the number of slots. The lookaside-configuration can be
** changed as start-time using sqlite3_config(SQLITE_CONFIG_LOOKASIDE)
** or at run-time for an individual database connection using
** sqlite3_db_config(db, SQLITE_DBCONFIG_LOOKASIDE);
**
** With the two-size-lookaside enhancement, less lookaside is required.
** The default configuration of 1200,40 actually provides 30 1200-byte slots
** and 93 128-byte slots, which is more lookaside than is available
** using the older 1200,100 configuration without two-size-lookaside.
*/
#ifndef SQLITE_DEFAULT_LOOKASIDE
# ifdef SQLITE_OMIT_TWOSIZE_LOOKASIDE
# define SQLITE_DEFAULT_LOOKASIDE 1200,100 /* 120KB of memory */
# else
# define SQLITE_DEFAULT_LOOKASIDE 1200,40 /* 48KB of memory */
# endif
#endif
/* The default maximum size of an in-memory database created using
** sqlite3_deserialize()
*/
#ifndef SQLITE_MEMDB_DEFAULT_MAXSIZE
# define SQLITE_MEMDB_DEFAULT_MAXSIZE 1073741824
#endif
/*
** The following singleton contains the global configuration for
** the SQLite library.
*/
SQLITE_WSD struct Sqlite3Config sqlite3Config = {
SQLITE_DEFAULT_MEMSTATUS, /* bMemstat */
1, /* bCoreMutex */
SQLITE_THREADSAFE==1, /* bFullMutex */
SQLITE_USE_URI, /* bOpenUri */
SQLITE_ALLOW_COVERING_INDEX_SCAN, /* bUseCis */
0, /* bSmallMalloc */
1, /* bExtraSchemaChecks */
0x7ffffffe, /* mxStrlen */
0, /* neverCorrupt */
SQLITE_DEFAULT_LOOKASIDE, /* szLookaside, nLookaside */
SQLITE_STMTJRNL_SPILL, /* nStmtSpill */
{0,0,0,0,0,0,0,0}, /* m */
{0,0,0,0,0,0,0,0,0}, /* mutex */
{0,0,0,0,0,0,0,0,0,0,0,0,0},/* pcache2 */
(void*)0, /* pHeap */
0, /* nHeap */
0, 0, /* mnHeap, mxHeap */
SQLITE_DEFAULT_MMAP_SIZE, /* szMmap */
SQLITE_MAX_MMAP_SIZE, /* mxMmap */
(void*)0, /* pPage */
0, /* szPage */
SQLITE_DEFAULT_PCACHE_INITSZ, /* nPage */
0, /* mxParserStack */
0, /* sharedCacheEnabled */
SQLITE_SORTER_PMASZ, /* szPma */
/* All the rest should always be initialized to zero */
0, /* isInit */
0, /* inProgress */
0, /* isMutexInit */
0, /* isMallocInit */
0, /* isPCacheInit */
0, /* nRefInitMutex */
0, /* pInitMutex */
0, /* xLog */
0, /* pLogArg */
#ifdef SQLITE_ENABLE_SQLLOG
0, /* xSqllog */
0, /* pSqllogArg */
#endif
#ifdef SQLITE_VDBE_COVERAGE
0, /* xVdbeBranch */
0, /* pVbeBranchArg */
#endif
#ifndef SQLITE_OMIT_DESERIALIZE
SQLITE_MEMDB_DEFAULT_MAXSIZE, /* mxMemdbSize */
#endif
#ifndef SQLITE_UNTESTABLE
0, /* xTestCallback */
#endif
0, /* bLocaltimeFault */
0, /* xAltLocaltime */
0x7ffffffe, /* iOnceResetThreshold */
SQLITE_DEFAULT_SORTERREF_SIZE, /* szSorterRef */
0, /* iPrngSeed */
#ifdef SQLITE_DEBUG
{0,0,0,0,0,0} /* aTune */
#endif
};
/*
** Hash table for global functions - functions common to all
** database connections. After initialization, this table is
** read-only.
*/
FuncDefHash sqlite3BuiltinFunctions;
#if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_DEBUG)
/*
** Counter used for coverage testing. Does not come into play for
** release builds.
**
** Access to this global variable is not mutex protected. This might
** result in TSAN warnings. But as the variable does not exist in
** release builds, that should not be a concern.
*/
unsigned int sqlite3CoverageCounter;
#endif /* SQLITE_COVERAGE_TEST || SQLITE_DEBUG */
#ifdef VDBE_PROFILE
/*
** The following performance counter can be used in place of
** sqlite3Hwtime() for profiling. This is a no-op on standard builds.
*/
sqlite3_uint64 sqlite3NProfileCnt = 0;
#endif
/*
** The value of the "pending" byte must be 0x40000000 (1 byte past the
** 1-gibabyte boundary) in a compatible database. SQLite never uses
** the database page that contains the pending byte. It never attempts
** to read or write that page. The pending byte page is set aside
** for use by the VFS layers as space for managing file locks.
**
** During testing, it is often desirable to move the pending byte to
** a different position in the file. This allows code that has to
** deal with the pending byte to run on files that are much smaller
** than 1 GiB. The sqlite3_test_control() interface can be used to
** move the pending byte.
**
** IMPORTANT: Changing the pending byte to any value other than
** 0x40000000 results in an incompatible database file format!
** Changing the pending byte during operation will result in undefined
** and incorrect behavior.
*/
#ifndef SQLITE_OMIT_WSD
int sqlite3PendingByte = 0x40000000;
#endif
/*
** Tracing flags set by SQLITE_TESTCTRL_TRACEFLAGS.
*/
u32 sqlite3TreeTrace = 0;
u32 sqlite3WhereTrace = 0;
#include "third_party/sqlite3/opcodes.h"
/*
** Properties of opcodes. The OPFLG_INITIALIZER macro is
** created by mkopcodeh.awk during compilation. Data is obtained
** from the comments following the "case OP_xxxx:" statements in
** the vdbe.c file.
*/
const unsigned char sqlite3OpcodeProperty[] = OPFLG_INITIALIZER;
/*
** Name of the default collating sequence
*/
const char sqlite3StrBINARY[] = "BINARY";
/*
** Standard typenames. These names must match the COLTYPE_* definitions.
** Adjust the SQLITE_N_STDTYPE value if adding or removing entries.
**
** sqlite3StdType[] The actual names of the datatypes.
**
** sqlite3StdTypeLen[] The length (in bytes) of each entry
** in sqlite3StdType[].
**
** sqlite3StdTypeAffinity[] The affinity associated with each entry
** in sqlite3StdType[].
*/
const unsigned char sqlite3StdTypeLen[] = { 3, 4, 3, 7, 4, 4 };
const char sqlite3StdTypeAffinity[] = {
SQLITE_AFF_NUMERIC,
SQLITE_AFF_BLOB,
SQLITE_AFF_INTEGER,
SQLITE_AFF_INTEGER,
SQLITE_AFF_REAL,
SQLITE_AFF_TEXT
};
const char *sqlite3StdType[] = {
"ANY",
"BLOB",
"INT",
"INTEGER",
"REAL",
"TEXT"
};
| 17,129 | 396 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/userauth.c | /*
** 2014-09-08
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains the bulk of the implementation of the
** user-authentication extension feature. Some parts of the user-
** authentication code are contained within the SQLite core (in the
** src/ subdirectory of the main source code tree) but those parts
** that could reasonable be separated out are moved into this file.
**
** To compile with the user-authentication feature, append this file to
** end of an SQLite amalgamation, then add the SQLITE_USER_AUTHENTICATION
** compile-time option. See the user-auth.txt file in the same source
** directory as this file for additional information.
*/
#ifdef SQLITE_USER_AUTHENTICATION
#ifndef SQLITEINT_H
# include "sqliteInt.h"
#endif
/*
** Prepare an SQL statement for use by the user authentication logic.
** Return a pointer to the prepared statement on success. Return a
** NULL pointer if there is an error of any kind.
*/
static sqlite3_stmt *sqlite3UserAuthPrepare(
sqlite3 *db,
const char *zFormat,
...
){
sqlite3_stmt *pStmt;
char *zSql;
int rc;
va_list ap;
u64 savedFlags = db->flags;
va_start(ap, zFormat);
zSql = sqlite3_vmprintf(zFormat, ap);
va_end(ap);
if( zSql==0 ) return 0;
db->flags |= SQLITE_WriteSchema;
rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
db->flags = savedFlags;
sqlite3_free(zSql);
if( rc ){
sqlite3_finalize(pStmt);
pStmt = 0;
}
return pStmt;
}
/*
** Check to see if the sqlite_user table exists in database zDb.
*/
static int userTableExists(sqlite3 *db, const char *zDb){
int rc;
sqlite3_mutex_enter(db->mutex);
sqlite3BtreeEnterAll(db);
if( db->init.busy==0 ){
char *zErr = 0;
sqlite3Init(db, &zErr);
sqlite3DbFree(db, zErr);
}
rc = sqlite3FindTable(db, "sqlite_user", zDb)!=0;
sqlite3BtreeLeaveAll(db);
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Check to see if database zDb has a "sqlite_user" table and if it does
** whether that table can authenticate zUser with nPw,zPw. Write one of
** the UAUTH_* user authorization level codes into *peAuth and return a
** result code.
*/
static int userAuthCheckLogin(
sqlite3 *db, /* The database connection to check */
const char *zDb, /* Name of specific database to check */
u8 *peAuth /* OUT: One of UAUTH_* constants */
){
sqlite3_stmt *pStmt;
int rc;
*peAuth = UAUTH_Unknown;
if( !userTableExists(db, "main") ){
*peAuth = UAUTH_Admin; /* No sqlite_user table. Everybody is admin. */
return SQLITE_OK;
}
if( db->auth.zAuthUser==0 ){
*peAuth = UAUTH_Fail;
return SQLITE_OK;
}
pStmt = sqlite3UserAuthPrepare(db,
"SELECT pw=sqlite_crypt(?1,pw), isAdmin FROM \"%w\".sqlite_user"
" WHERE uname=?2", zDb);
if( pStmt==0 ) return SQLITE_NOMEM;
sqlite3_bind_blob(pStmt, 1, db->auth.zAuthPW, db->auth.nAuthPW,SQLITE_STATIC);
sqlite3_bind_text(pStmt, 2, db->auth.zAuthUser, -1, SQLITE_STATIC);
rc = sqlite3_step(pStmt);
if( rc==SQLITE_ROW && sqlite3_column_int(pStmt,0) ){
*peAuth = sqlite3_column_int(pStmt, 1) + UAUTH_User;
}else{
*peAuth = UAUTH_Fail;
}
return sqlite3_finalize(pStmt);
}
int sqlite3UserAuthCheckLogin(
sqlite3 *db, /* The database connection to check */
const char *zDb, /* Name of specific database to check */
u8 *peAuth /* OUT: One of UAUTH_* constants */
){
int rc;
u8 savedAuthLevel;
assert( zDb!=0 );
assert( peAuth!=0 );
savedAuthLevel = db->auth.authLevel;
db->auth.authLevel = UAUTH_Admin;
rc = userAuthCheckLogin(db, zDb, peAuth);
db->auth.authLevel = savedAuthLevel;
return rc;
}
/*
** If the current authLevel is UAUTH_Unknown, the take actions to figure
** out what authLevel should be
*/
void sqlite3UserAuthInit(sqlite3 *db){
if( db->auth.authLevel==UAUTH_Unknown ){
u8 authLevel = UAUTH_Fail;
sqlite3UserAuthCheckLogin(db, "main", &authLevel);
db->auth.authLevel = authLevel;
if( authLevel<UAUTH_Admin ) db->flags &= ~SQLITE_WriteSchema;
}
}
/*
** Implementation of the sqlite_crypt(X,Y) function.
**
** If Y is NULL then generate a new hash for password X and return that
** hash. If Y is not null, then generate a hash for password X using the
** same salt as the previous hash Y and return the new hash.
*/
void sqlite3CryptFunc(
sqlite3_context *context,
int NotUsed,
sqlite3_value **argv
){
const char *zIn;
int nIn, ii;
u8 *zOut;
char zSalt[8];
zIn = sqlite3_value_blob(argv[0]);
nIn = sqlite3_value_bytes(argv[0]);
if( sqlite3_value_type(argv[1])==SQLITE_BLOB
&& sqlite3_value_bytes(argv[1])==nIn+sizeof(zSalt)
){
memcpy(zSalt, sqlite3_value_blob(argv[1]), sizeof(zSalt));
}else{
sqlite3_randomness(sizeof(zSalt), zSalt);
}
zOut = sqlite3_malloc( nIn+sizeof(zSalt) );
if( zOut==0 ){
sqlite3_result_error_nomem(context);
}else{
memcpy(zOut, zSalt, sizeof(zSalt));
for(ii=0; ii<nIn; ii++){
zOut[ii+sizeof(zSalt)] = zIn[ii]^zSalt[ii&0x7];
}
sqlite3_result_blob(context, zOut, nIn+sizeof(zSalt), sqlite3_free);
}
}
/*
** If a database contains the SQLITE_USER table, then the
** sqlite3_user_authenticate() interface must be invoked with an
** appropriate username and password prior to enable read and write
** access to the database.
**
** Return SQLITE_OK on success or SQLITE_ERROR if the username/password
** combination is incorrect or unknown.
**
** If the SQLITE_USER table is not present in the database file, then
** this interface is a harmless no-op returnning SQLITE_OK.
*/
int sqlite3_user_authenticate(
sqlite3 *db, /* The database connection */
const char *zUsername, /* Username */
const char *zPW, /* Password or credentials */
int nPW /* Number of bytes in aPW[] */
){
int rc;
u8 authLevel = UAUTH_Fail;
db->auth.authLevel = UAUTH_Unknown;
sqlite3_free(db->auth.zAuthUser);
sqlite3_free(db->auth.zAuthPW);
memset(&db->auth, 0, sizeof(db->auth));
db->auth.zAuthUser = sqlite3_mprintf("%s", zUsername);
if( db->auth.zAuthUser==0 ) return SQLITE_NOMEM;
db->auth.zAuthPW = sqlite3_malloc( nPW+1 );
if( db->auth.zAuthPW==0 ) return SQLITE_NOMEM;
memcpy(db->auth.zAuthPW,zPW,nPW);
db->auth.nAuthPW = nPW;
rc = sqlite3UserAuthCheckLogin(db, "main", &authLevel);
db->auth.authLevel = authLevel;
sqlite3ExpirePreparedStatements(db, 0);
if( rc ){
return rc; /* OOM error, I/O error, etc. */
}
if( authLevel<UAUTH_User ){
return SQLITE_AUTH; /* Incorrect username and/or password */
}
return SQLITE_OK; /* Successful login */
}
/*
** The sqlite3_user_add() interface can be used (by an admin user only)
** to create a new user. When called on a no-authentication-required
** database, this routine converts the database into an authentication-
** required database, automatically makes the added user an
** administrator, and logs in the current connection as that user.
** The sqlite3_user_add() interface only works for the "main" database, not
** for any ATTACH-ed databases. Any call to sqlite3_user_add() by a
** non-admin user results in an error.
*/
int sqlite3_user_add(
sqlite3 *db, /* Database connection */
const char *zUsername, /* Username to be added */
const char *aPW, /* Password or credentials */
int nPW, /* Number of bytes in aPW[] */
int isAdmin /* True to give new user admin privilege */
){
sqlite3_stmt *pStmt;
int rc;
sqlite3UserAuthInit(db);
if( db->auth.authLevel<UAUTH_Admin ) return SQLITE_AUTH;
if( !userTableExists(db, "main") ){
if( !isAdmin ) return SQLITE_AUTH;
pStmt = sqlite3UserAuthPrepare(db,
"CREATE TABLE sqlite_user(\n"
" uname TEXT PRIMARY KEY,\n"
" isAdmin BOOLEAN,\n"
" pw BLOB\n"
") WITHOUT ROWID;");
if( pStmt==0 ) return SQLITE_NOMEM;
sqlite3_step(pStmt);
rc = sqlite3_finalize(pStmt);
if( rc ) return rc;
}
pStmt = sqlite3UserAuthPrepare(db,
"INSERT INTO sqlite_user(uname,isAdmin,pw)"
" VALUES(%Q,%d,sqlite_crypt(?1,NULL))",
zUsername, isAdmin!=0);
if( pStmt==0 ) return SQLITE_NOMEM;
sqlite3_bind_blob(pStmt, 1, aPW, nPW, SQLITE_STATIC);
sqlite3_step(pStmt);
rc = sqlite3_finalize(pStmt);
if( rc ) return rc;
if( db->auth.zAuthUser==0 ){
assert( isAdmin!=0 );
sqlite3_user_authenticate(db, zUsername, aPW, nPW);
}
return SQLITE_OK;
}
/*
** The sqlite3_user_change() interface can be used to change a users
** login credentials or admin privilege. Any user can change their own
** login credentials. Only an admin user can change another users login
** credentials or admin privilege setting. No user may change their own
** admin privilege setting.
*/
int sqlite3_user_change(
sqlite3 *db, /* Database connection */
const char *zUsername, /* Username to change */
const char *aPW, /* Modified password or credentials */
int nPW, /* Number of bytes in aPW[] */
int isAdmin /* Modified admin privilege for the user */
){
sqlite3_stmt *pStmt;
int rc;
u8 authLevel;
authLevel = db->auth.authLevel;
if( authLevel<UAUTH_User ){
/* Must be logged in to make a change */
return SQLITE_AUTH;
}
if( strcmp(db->auth.zAuthUser, zUsername)!=0 ){
if( db->auth.authLevel<UAUTH_Admin ){
/* Must be an administrator to change a different user */
return SQLITE_AUTH;
}
}else if( isAdmin!=(authLevel==UAUTH_Admin) ){
/* Cannot change the isAdmin setting for self */
return SQLITE_AUTH;
}
db->auth.authLevel = UAUTH_Admin;
if( !userTableExists(db, "main") ){
/* This routine is a no-op if the user to be modified does not exist */
}else{
pStmt = sqlite3UserAuthPrepare(db,
"UPDATE sqlite_user SET isAdmin=%d, pw=sqlite_crypt(?1,NULL)"
" WHERE uname=%Q", isAdmin, zUsername);
if( pStmt==0 ){
rc = SQLITE_NOMEM;
}else{
sqlite3_bind_blob(pStmt, 1, aPW, nPW, SQLITE_STATIC);
sqlite3_step(pStmt);
rc = sqlite3_finalize(pStmt);
}
}
db->auth.authLevel = authLevel;
return rc;
}
/*
** The sqlite3_user_delete() interface can be used (by an admin user only)
** to delete a user. The currently logged-in user cannot be deleted,
** which guarantees that there is always an admin user and hence that
** the database cannot be converted into a no-authentication-required
** database.
*/
int sqlite3_user_delete(
sqlite3 *db, /* Database connection */
const char *zUsername /* Username to remove */
){
sqlite3_stmt *pStmt;
if( db->auth.authLevel<UAUTH_Admin ){
/* Must be an administrator to delete a user */
return SQLITE_AUTH;
}
if( strcmp(db->auth.zAuthUser, zUsername)==0 ){
/* Cannot delete self */
return SQLITE_AUTH;
}
if( !userTableExists(db, "main") ){
/* This routine is a no-op if the user to be deleted does not exist */
return SQLITE_OK;
}
pStmt = sqlite3UserAuthPrepare(db,
"DELETE FROM sqlite_user WHERE uname=%Q", zUsername);
if( pStmt==0 ) return SQLITE_NOMEM;
sqlite3_step(pStmt);
return sqlite3_finalize(pStmt);
}
#endif /* SQLITE_USER_AUTHENTICATION */
| 11,623 | 356 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/malloc.shell.c | #include "third_party/sqlite3/malloc.c"
| 40 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/sqlite3userauth.h | /*
** 2014-09-08
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains the application interface definitions for the
** user-authentication extension feature.
**
** To compile with the user-authentication feature, append this file to
** end of an SQLite amalgamation header file ("sqlite3.h"), then add
** the SQLITE_USER_AUTHENTICATION compile-time option. See the
** user-auth.txt file in the same source directory as this file for
** additional information.
*/
#ifdef SQLITE_USER_AUTHENTICATION
#ifdef __cplusplus
extern "C" {
#endif
/*
** If a database contains the SQLITE_USER table, then the
** sqlite3_user_authenticate() interface must be invoked with an
** appropriate username and password prior to enable read and write
** access to the database.
**
** Return SQLITE_OK on success or SQLITE_ERROR if the username/password
** combination is incorrect or unknown.
**
** If the SQLITE_USER table is not present in the database file, then
** this interface is a harmless no-op returnning SQLITE_OK.
*/
int sqlite3_user_authenticate(
sqlite3 *db, /* The database connection */
const char *zUsername, /* Username */
const char *aPW, /* Password or credentials */
int nPW /* Number of bytes in aPW[] */
);
/*
** The sqlite3_user_add() interface can be used (by an admin user only)
** to create a new user. When called on a no-authentication-required
** database, this routine converts the database into an authentication-
** required database, automatically makes the added user an
** administrator, and logs in the current connection as that user.
** The sqlite3_user_add() interface only works for the "main" database, not
** for any ATTACH-ed databases. Any call to sqlite3_user_add() by a
** non-admin user results in an error.
*/
int sqlite3_user_add(
sqlite3 *db, /* Database connection */
const char *zUsername, /* Username to be added */
const char *aPW, /* Password or credentials */
int nPW, /* Number of bytes in aPW[] */
int isAdmin /* True to give new user admin privilege */
);
/*
** The sqlite3_user_change() interface can be used to change a users
** login credentials or admin privilege. Any user can change their own
** login credentials. Only an admin user can change another users login
** credentials or admin privilege setting. No user may change their own
** admin privilege setting.
*/
int sqlite3_user_change(
sqlite3 *db, /* Database connection */
const char *zUsername, /* Username to change */
const char *aPW, /* New password or credentials */
int nPW, /* Number of bytes in aPW[] */
int isAdmin /* Modified admin privilege for the user */
);
/*
** The sqlite3_user_delete() interface can be used (by an admin user only)
** to delete a user. The currently logged-in user cannot be deleted,
** which guarantees that there is always an admin user and hence that
** the database cannot be converted into a no-authentication-required
** database.
*/
int sqlite3_user_delete(
sqlite3 *db, /* Database connection */
const char *zUsername /* Username to remove */
);
#ifdef __cplusplus
} /* end of the 'extern "C"' block */
#endif
#endif /* SQLITE_USER_AUTHENTICATION */
| 3,591 | 97 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/mem2.c | /*
** 2007 August 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains low-level memory allocation drivers for when
** SQLite will use the standard C-library malloc/realloc/free interface
** to obtain the memory it needs while adding lots of additional debugging
** information to each allocation in order to help detect and fix memory
** leaks and memory usage errors.
**
** This file contains implementations of the low-level memory allocation
** routines specified in the sqlite3_mem_methods object.
*/
#include "third_party/sqlite3/sqliteInt.h"
/*
** This version of the memory allocator is used only if the
** SQLITE_MEMDEBUG macro is defined
*/
#ifdef SQLITE_MEMDEBUG
/*
** The backtrace functionality is only available with GLIBC
*/
#ifdef __GLIBC__
extern int backtrace(void**,int);
extern void backtrace_symbols_fd(void*const*,int,int);
#else
# define backtrace(A,B) 1
# define backtrace_symbols_fd(A,B,C)
#endif
#include <stdio.h>
/*
** Each memory allocation looks like this:
**
** ------------------------------------------------------------------------
** | Title | backtrace pointers | MemBlockHdr | allocation | EndGuard |
** ------------------------------------------------------------------------
**
** The application code sees only a pointer to the allocation. We have
** to back up from the allocation pointer to find the MemBlockHdr. The
** MemBlockHdr tells us the size of the allocation and the number of
** backtrace pointers. There is also a guard word at the end of the
** MemBlockHdr.
*/
struct MemBlockHdr {
i64 iSize; /* Size of this allocation */
struct MemBlockHdr *pNext, *pPrev; /* Linked list of all unfreed memory */
char nBacktrace; /* Number of backtraces on this alloc */
char nBacktraceSlots; /* Available backtrace slots */
u8 nTitle; /* Bytes of title; includes '\0' */
u8 eType; /* Allocation type code */
int iForeGuard; /* Guard word for sanity */
};
/*
** Guard words
*/
#define FOREGUARD 0x80F5E153
#define REARGUARD 0xE4676B53
/*
** Number of malloc size increments to track.
*/
#define NCSIZE 1000
/*
** All of the static variables used by this module are collected
** into a single structure named "mem". This is to keep the
** static variables organized and to reduce namespace pollution
** when this module is combined with other in the amalgamation.
*/
static struct {
/*
** Mutex to control access to the memory allocation subsystem.
*/
sqlite3_mutex *mutex;
/*
** Head and tail of a linked list of all outstanding allocations
*/
struct MemBlockHdr *pFirst;
struct MemBlockHdr *pLast;
/*
** The number of levels of backtrace to save in new allocations.
*/
int nBacktrace;
void (*xBacktrace)(int, int, void **);
/*
** Title text to insert in front of each block
*/
int nTitle; /* Bytes of zTitle to save. Includes '\0' and padding */
char zTitle[100]; /* The title text */
/*
** sqlite3MallocDisallow() increments the following counter.
** sqlite3MallocAllow() decrements it.
*/
int disallow; /* Do not allow memory allocation */
/*
** Gather statistics on the sizes of memory allocations.
** nAlloc[i] is the number of allocation attempts of i*8
** bytes. i==NCSIZE is the number of allocation attempts for
** sizes more than NCSIZE*8 bytes.
*/
int nAlloc[NCSIZE]; /* Total number of allocations */
int nCurrent[NCSIZE]; /* Current number of allocations */
int mxCurrent[NCSIZE]; /* Highwater mark for nCurrent */
} mem;
/*
** Adjust memory usage statistics
*/
static void adjustStats(int iSize, int increment){
int i = ROUND8(iSize)/8;
if( i>NCSIZE-1 ){
i = NCSIZE - 1;
}
if( increment>0 ){
mem.nAlloc[i]++;
mem.nCurrent[i]++;
if( mem.nCurrent[i]>mem.mxCurrent[i] ){
mem.mxCurrent[i] = mem.nCurrent[i];
}
}else{
mem.nCurrent[i]--;
assert( mem.nCurrent[i]>=0 );
}
}
/*
** Given an allocation, find the MemBlockHdr for that allocation.
**
** This routine checks the guards at either end of the allocation and
** if they are incorrect it asserts.
*/
static struct MemBlockHdr *sqlite3MemsysGetHeader(const void *pAllocation){
struct MemBlockHdr *p;
int *pInt;
u8 *pU8;
int nReserve;
p = (struct MemBlockHdr*)pAllocation;
p--;
assert( p->iForeGuard==(int)FOREGUARD );
nReserve = ROUND8(p->iSize);
pInt = (int*)pAllocation;
pU8 = (u8*)pAllocation;
assert( pInt[nReserve/sizeof(int)]==(int)REARGUARD );
/* This checks any of the "extra" bytes allocated due
** to rounding up to an 8 byte boundary to ensure
** they haven't been overwritten.
*/
while( nReserve-- > p->iSize ) assert( pU8[nReserve]==0x65 );
return p;
}
/*
** Return the number of bytes currently allocated at address p.
*/
static int sqlite3MemSize(void *p){
struct MemBlockHdr *pHdr;
if( !p ){
return 0;
}
pHdr = sqlite3MemsysGetHeader(p);
return (int)pHdr->iSize;
}
/*
** Initialize the memory allocation subsystem.
*/
static int sqlite3MemInit(void *NotUsed){
UNUSED_PARAMETER(NotUsed);
assert( (sizeof(struct MemBlockHdr)&7) == 0 );
if( !sqlite3GlobalConfig.bMemstat ){
/* If memory status is enabled, then the malloc.c wrapper will already
** hold the STATIC_MEM mutex when the routines here are invoked. */
mem.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MEM);
}
return SQLITE_OK;
}
/*
** Deinitialize the memory allocation subsystem.
*/
static void sqlite3MemShutdown(void *NotUsed){
UNUSED_PARAMETER(NotUsed);
mem.mutex = 0;
}
/*
** Round up a request size to the next valid allocation size.
*/
static int sqlite3MemRoundup(int n){
return ROUND8(n);
}
/*
** Fill a buffer with pseudo-random bytes. This is used to preset
** the content of a new memory allocation to unpredictable values and
** to clear the content of a freed allocation to unpredictable values.
*/
static void randomFill(char *pBuf, int nByte){
unsigned int x, y, r;
x = SQLITE_PTR_TO_INT(pBuf);
y = nByte | 1;
while( nByte >= 4 ){
x = (x>>1) ^ (-(int)(x&1) & 0xd0000001);
y = y*1103515245 + 12345;
r = x ^ y;
*(int*)pBuf = r;
pBuf += 4;
nByte -= 4;
}
while( nByte-- > 0 ){
x = (x>>1) ^ (-(int)(x&1) & 0xd0000001);
y = y*1103515245 + 12345;
r = x ^ y;
*(pBuf++) = r & 0xff;
}
}
/*
** Allocate nByte bytes of memory.
*/
static void *sqlite3MemMalloc(int nByte){
struct MemBlockHdr *pHdr;
void **pBt;
char *z;
int *pInt;
void *p = 0;
int totalSize;
int nReserve;
sqlite3_mutex_enter(mem.mutex);
assert( mem.disallow==0 );
nReserve = ROUND8(nByte);
totalSize = nReserve + sizeof(*pHdr) + sizeof(int) +
mem.nBacktrace*sizeof(void*) + mem.nTitle;
p = malloc(totalSize);
if( p ){
z = p;
pBt = (void**)&z[mem.nTitle];
pHdr = (struct MemBlockHdr*)&pBt[mem.nBacktrace];
pHdr->pNext = 0;
pHdr->pPrev = mem.pLast;
if( mem.pLast ){
mem.pLast->pNext = pHdr;
}else{
mem.pFirst = pHdr;
}
mem.pLast = pHdr;
pHdr->iForeGuard = FOREGUARD;
pHdr->eType = MEMTYPE_HEAP;
pHdr->nBacktraceSlots = mem.nBacktrace;
pHdr->nTitle = mem.nTitle;
if( mem.nBacktrace ){
void *aAddr[40];
pHdr->nBacktrace = backtrace(aAddr, mem.nBacktrace+1)-1;
memcpy(pBt, &aAddr[1], pHdr->nBacktrace*sizeof(void*));
assert(pBt[0]);
if( mem.xBacktrace ){
mem.xBacktrace(nByte, pHdr->nBacktrace-1, &aAddr[1]);
}
}else{
pHdr->nBacktrace = 0;
}
if( mem.nTitle ){
memcpy(z, mem.zTitle, mem.nTitle);
}
pHdr->iSize = nByte;
adjustStats(nByte, +1);
pInt = (int*)&pHdr[1];
pInt[nReserve/sizeof(int)] = REARGUARD;
randomFill((char*)pInt, nByte);
memset(((char*)pInt)+nByte, 0x65, nReserve-nByte);
p = (void*)pInt;
}
sqlite3_mutex_leave(mem.mutex);
return p;
}
/*
** Free memory.
*/
static void sqlite3MemFree(void *pPrior){
struct MemBlockHdr *pHdr;
void **pBt;
char *z;
assert( sqlite3GlobalConfig.bMemstat || sqlite3GlobalConfig.bCoreMutex==0
|| mem.mutex!=0 );
pHdr = sqlite3MemsysGetHeader(pPrior);
pBt = (void**)pHdr;
pBt -= pHdr->nBacktraceSlots;
sqlite3_mutex_enter(mem.mutex);
if( pHdr->pPrev ){
assert( pHdr->pPrev->pNext==pHdr );
pHdr->pPrev->pNext = pHdr->pNext;
}else{
assert( mem.pFirst==pHdr );
mem.pFirst = pHdr->pNext;
}
if( pHdr->pNext ){
assert( pHdr->pNext->pPrev==pHdr );
pHdr->pNext->pPrev = pHdr->pPrev;
}else{
assert( mem.pLast==pHdr );
mem.pLast = pHdr->pPrev;
}
z = (char*)pBt;
z -= pHdr->nTitle;
adjustStats((int)pHdr->iSize, -1);
randomFill(z, sizeof(void*)*pHdr->nBacktraceSlots + sizeof(*pHdr) +
(int)pHdr->iSize + sizeof(int) + pHdr->nTitle);
free(z);
sqlite3_mutex_leave(mem.mutex);
}
/*
** Change the size of an existing memory allocation.
**
** For this debugging implementation, we *always* make a copy of the
** allocation into a new place in memory. In this way, if the
** higher level code is using pointer to the old allocation, it is
** much more likely to break and we are much more liking to find
** the error.
*/
static void *sqlite3MemRealloc(void *pPrior, int nByte){
struct MemBlockHdr *pOldHdr;
void *pNew;
assert( mem.disallow==0 );
assert( (nByte & 7)==0 ); /* EV: R-46199-30249 */
pOldHdr = sqlite3MemsysGetHeader(pPrior);
pNew = sqlite3MemMalloc(nByte);
if( pNew ){
memcpy(pNew, pPrior, (int)(nByte<pOldHdr->iSize ? nByte : pOldHdr->iSize));
if( nByte>pOldHdr->iSize ){
randomFill(&((char*)pNew)[pOldHdr->iSize], nByte - (int)pOldHdr->iSize);
}
sqlite3MemFree(pPrior);
}
return pNew;
}
/*
** Populate the low-level memory allocation function pointers in
** sqlite3GlobalConfig.m with pointers to the routines in this file.
*/
void sqlite3MemSetDefault(void){
static const sqlite3_mem_methods defaultMethods = {
sqlite3MemMalloc,
sqlite3MemFree,
sqlite3MemRealloc,
sqlite3MemSize,
sqlite3MemRoundup,
sqlite3MemInit,
sqlite3MemShutdown,
0
};
sqlite3_config(SQLITE_CONFIG_MALLOC, &defaultMethods);
}
/*
** Set the "type" of an allocation.
*/
void sqlite3MemdebugSetType(void *p, u8 eType){
if( p && sqlite3GlobalConfig.m.xFree==sqlite3MemFree ){
struct MemBlockHdr *pHdr;
pHdr = sqlite3MemsysGetHeader(p);
assert( pHdr->iForeGuard==FOREGUARD );
pHdr->eType = eType;
}
}
/*
** Return TRUE if the mask of type in eType matches the type of the
** allocation p. Also return true if p==NULL.
**
** This routine is designed for use within an assert() statement, to
** verify the type of an allocation. For example:
**
** assert( sqlite3MemdebugHasType(p, MEMTYPE_HEAP) );
*/
int sqlite3MemdebugHasType(const void *p, u8 eType){
int rc = 1;
if( p && sqlite3GlobalConfig.m.xFree==sqlite3MemFree ){
struct MemBlockHdr *pHdr;
pHdr = sqlite3MemsysGetHeader(p);
assert( pHdr->iForeGuard==FOREGUARD ); /* Allocation is valid */
if( (pHdr->eType&eType)==0 ){
rc = 0;
}
}
return rc;
}
/*
** Return TRUE if the mask of type in eType matches no bits of the type of the
** allocation p. Also return true if p==NULL.
**
** This routine is designed for use within an assert() statement, to
** verify the type of an allocation. For example:
**
** assert( sqlite3MemdebugNoType(p, MEMTYPE_LOOKASIDE) );
*/
int sqlite3MemdebugNoType(const void *p, u8 eType){
int rc = 1;
if( p && sqlite3GlobalConfig.m.xFree==sqlite3MemFree ){
struct MemBlockHdr *pHdr;
pHdr = sqlite3MemsysGetHeader(p);
assert( pHdr->iForeGuard==FOREGUARD ); /* Allocation is valid */
if( (pHdr->eType&eType)!=0 ){
rc = 0;
}
}
return rc;
}
/*
** Set the number of backtrace levels kept for each allocation.
** A value of zero turns off backtracing. The number is always rounded
** up to a multiple of 2.
*/
void sqlite3MemdebugBacktrace(int depth){
if( depth<0 ){ depth = 0; }
if( depth>20 ){ depth = 20; }
depth = (depth+1)&0xfe;
mem.nBacktrace = depth;
}
void sqlite3MemdebugBacktraceCallback(void (*xBacktrace)(int, int, void **)){
mem.xBacktrace = xBacktrace;
}
/*
** Set the title string for subsequent allocations.
*/
void sqlite3MemdebugSettitle(const char *zTitle){
unsigned int n = sqlite3Strlen30(zTitle) + 1;
sqlite3_mutex_enter(mem.mutex);
if( n>=sizeof(mem.zTitle) ) n = sizeof(mem.zTitle)-1;
memcpy(mem.zTitle, zTitle, n);
mem.zTitle[n] = 0;
mem.nTitle = ROUND8(n);
sqlite3_mutex_leave(mem.mutex);
}
void sqlite3MemdebugSync(){
struct MemBlockHdr *pHdr;
for(pHdr=mem.pFirst; pHdr; pHdr=pHdr->pNext){
void **pBt = (void**)pHdr;
pBt -= pHdr->nBacktraceSlots;
mem.xBacktrace((int)pHdr->iSize, pHdr->nBacktrace-1, &pBt[1]);
}
}
/*
** Open the file indicated and write a log of all unfreed memory
** allocations into that log.
*/
void sqlite3MemdebugDump(const char *zFilename){
FILE *out;
struct MemBlockHdr *pHdr;
void **pBt;
int i;
out = fopen(zFilename, "w");
if( out==0 ){
fprintf(stderr, "** Unable to output memory debug output log: %s **\n",
zFilename);
return;
}
for(pHdr=mem.pFirst; pHdr; pHdr=pHdr->pNext){
char *z = (char*)pHdr;
z -= pHdr->nBacktraceSlots*sizeof(void*) + pHdr->nTitle;
fprintf(out, "**** %lld bytes at %p from %s ****\n",
pHdr->iSize, &pHdr[1], pHdr->nTitle ? z : "???");
if( pHdr->nBacktrace ){
fflush(out);
pBt = (void**)pHdr;
pBt -= pHdr->nBacktraceSlots;
backtrace_symbols_fd(pBt, pHdr->nBacktrace, fileno(out));
fprintf(out, "\n");
}
}
fprintf(out, "COUNTS:\n");
for(i=0; i<NCSIZE-1; i++){
if( mem.nAlloc[i] ){
fprintf(out, " %5d: %10d %10d %10d\n",
i*8, mem.nAlloc[i], mem.nCurrent[i], mem.mxCurrent[i]);
}
}
if( mem.nAlloc[NCSIZE-1] ){
fprintf(out, " %5d: %10d %10d %10d\n",
NCSIZE*8-8, mem.nAlloc[NCSIZE-1],
mem.nCurrent[NCSIZE-1], mem.mxCurrent[NCSIZE-1]);
}
fclose(out);
}
/*
** Return the number of times sqlite3MemMalloc() has been called.
*/
int sqlite3MemdebugMallocCount(){
int i;
int nTotal = 0;
for(i=0; i<NCSIZE; i++){
nTotal += mem.nAlloc[i];
}
return nTotal;
}
#endif /* SQLITE_MEMDEBUG */
| 14,726 | 529 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/rtree.shell.c | #include "third_party/sqlite3/rtree.c"
| 39 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/printf.shell.c | #include "third_party/sqlite3/printf.c"
| 40 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_expr.c | /*
** 2008 Nov 28
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This module contains code that implements a parser for fts3 query strings
** (the right-hand argument to the MATCH operator). Because the supported
** syntax is relatively simple, the whole tokenizer/parser system is
** hand-coded.
*/
#include "third_party/sqlite3/fts3Int.h"
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
/*
** By default, this module parses the legacy syntax that has been
** traditionally used by fts3. Or, if SQLITE_ENABLE_FTS3_PARENTHESIS
** is defined, then it uses the new syntax. The differences between
** the new and the old syntaxes are:
**
** a) The new syntax supports parenthesis. The old does not.
**
** b) The new syntax supports the AND and NOT operators. The old does not.
**
** c) The old syntax supports the "-" token qualifier. This is not
** supported by the new syntax (it is replaced by the NOT operator).
**
** d) When using the old syntax, the OR operator has a greater precedence
** than an implicit AND. When using the new, both implicity and explicit
** AND operators have a higher precedence than OR.
**
** If compiled with SQLITE_TEST defined, then this module exports the
** symbol "int sqlite3_fts3_enable_parentheses". Setting this variable
** to zero causes the module to use the old syntax. If it is set to
** non-zero the new syntax is activated. This is so both syntaxes can
** be tested using a single build of testfixture.
**
** The following describes the syntax supported by the fts3 MATCH
** operator in a similar format to that used by the lemon parser
** generator. This module does not use actually lemon, it uses a
** custom parser.
**
** query ::= andexpr (OR andexpr)*.
**
** andexpr ::= notexpr (AND? notexpr)*.
**
** notexpr ::= nearexpr (NOT nearexpr|-TOKEN)*.
** notexpr ::= LP query RP.
**
** nearexpr ::= phrase (NEAR distance_opt nearexpr)*.
**
** distance_opt ::= .
** distance_opt ::= / INTEGER.
**
** phrase ::= TOKEN.
** phrase ::= COLUMN:TOKEN.
** phrase ::= "TOKEN TOKEN TOKEN...".
*/
#ifdef SQLITE_TEST
int sqlite3_fts3_enable_parentheses = 0;
#else
# ifdef SQLITE_ENABLE_FTS3_PARENTHESIS
# define sqlite3_fts3_enable_parentheses 1
# else
# define sqlite3_fts3_enable_parentheses 0
# endif
#endif
/*
** Default span for NEAR operators.
*/
#define SQLITE_FTS3_DEFAULT_NEAR_PARAM 10
#include "libc/assert.h"
#include "libc/str/str.h"
/*
** isNot:
** This variable is used by function getNextNode(). When getNextNode() is
** called, it sets ParseContext.isNot to true if the 'next node' is a
** FTSQUERY_PHRASE with a unary "-" attached to it. i.e. "mysql" in the
** FTS3 query "sqlite -mysql". Otherwise, ParseContext.isNot is set to
** zero.
*/
typedef struct ParseContext ParseContext;
struct ParseContext {
sqlite3_tokenizer *pTokenizer; /* Tokenizer module */
int iLangid; /* Language id used with tokenizer */
const char **azCol; /* Array of column names for fts3 table */
int bFts4; /* True to allow FTS4-only syntax */
int nCol; /* Number of entries in azCol[] */
int iDefaultCol; /* Default column to query */
int isNot; /* True if getNextNode() sees a unary - */
sqlite3_context *pCtx; /* Write error message here */
int nNest; /* Number of nested brackets */
};
/*
** This function is equivalent to the standard isspace() function.
**
** The standard isspace() can be awkward to use safely, because although it
** is defined to accept an argument of type int, its behavior when passed
** an integer that falls outside of the range of the unsigned char type
** is undefined (and sometimes, "undefined" means segfault). This wrapper
** is defined to accept an argument of type char, and always returns 0 for
** any values that fall outside of the range of the unsigned char type (i.e.
** negative values).
*/
static int fts3isspace(char c){
return c==' ' || c=='\t' || c=='\n' || c=='\r' || c=='\v' || c=='\f';
}
/*
** Allocate nByte bytes of memory using sqlite3_malloc(). If successful,
** zero the memory before returning a pointer to it. If unsuccessful,
** return NULL.
*/
void *sqlite3Fts3MallocZero(sqlite3_int64 nByte){
void *pRet = sqlite3_malloc64(nByte);
if( pRet ) memset(pRet, 0, nByte);
return pRet;
}
int sqlite3Fts3OpenTokenizer(
sqlite3_tokenizer *pTokenizer,
int iLangid,
const char *z,
int n,
sqlite3_tokenizer_cursor **ppCsr
){
sqlite3_tokenizer_module const *pModule = pTokenizer->pModule;
sqlite3_tokenizer_cursor *pCsr = 0;
int rc;
rc = pModule->xOpen(pTokenizer, z, n, &pCsr);
assert( rc==SQLITE_OK || pCsr==0 );
if( rc==SQLITE_OK ){
pCsr->pTokenizer = pTokenizer;
if( pModule->iVersion>=1 ){
rc = pModule->xLanguageid(pCsr, iLangid);
if( rc!=SQLITE_OK ){
pModule->xClose(pCsr);
pCsr = 0;
}
}
}
*ppCsr = pCsr;
return rc;
}
/*
** Function getNextNode(), which is called by fts3ExprParse(), may itself
** call fts3ExprParse(). So this forward declaration is required.
*/
static int fts3ExprParse(ParseContext *, const char *, int, Fts3Expr **, int *);
/*
** Extract the next token from buffer z (length n) using the tokenizer
** and other information (column names etc.) in pParse. Create an Fts3Expr
** structure of type FTSQUERY_PHRASE containing a phrase consisting of this
** single token and set *ppExpr to point to it. If the end of the buffer is
** reached before a token is found, set *ppExpr to zero. It is the
** responsibility of the caller to eventually deallocate the allocated
** Fts3Expr structure (if any) by passing it to sqlite3_free().
**
** Return SQLITE_OK if successful, or SQLITE_NOMEM if a memory allocation
** fails.
*/
static int getNextToken(
ParseContext *pParse, /* fts3 query parse context */
int iCol, /* Value for Fts3Phrase.iColumn */
const char *z, int n, /* Input string */
Fts3Expr **ppExpr, /* OUT: expression */
int *pnConsumed /* OUT: Number of bytes consumed */
){
sqlite3_tokenizer *pTokenizer = pParse->pTokenizer;
sqlite3_tokenizer_module const *pModule = pTokenizer->pModule;
int rc;
sqlite3_tokenizer_cursor *pCursor;
Fts3Expr *pRet = 0;
int i = 0;
/* Set variable i to the maximum number of bytes of input to tokenize. */
for(i=0; i<n; i++){
if( sqlite3_fts3_enable_parentheses && (z[i]=='(' || z[i]==')') ) break;
if( z[i]=='"' ) break;
}
*pnConsumed = i;
rc = sqlite3Fts3OpenTokenizer(pTokenizer, pParse->iLangid, z, i, &pCursor);
if( rc==SQLITE_OK ){
const char *zToken;
int nToken = 0, iStart = 0, iEnd = 0, iPosition = 0;
sqlite3_int64 nByte; /* total space to allocate */
rc = pModule->xNext(pCursor, &zToken, &nToken, &iStart, &iEnd, &iPosition);
if( rc==SQLITE_OK ){
nByte = sizeof(Fts3Expr) + sizeof(Fts3Phrase) + nToken;
pRet = (Fts3Expr *)sqlite3Fts3MallocZero(nByte);
if( !pRet ){
rc = SQLITE_NOMEM;
}else{
pRet->eType = FTSQUERY_PHRASE;
pRet->pPhrase = (Fts3Phrase *)&pRet[1];
pRet->pPhrase->nToken = 1;
pRet->pPhrase->iColumn = iCol;
pRet->pPhrase->aToken[0].n = nToken;
pRet->pPhrase->aToken[0].z = (char *)&pRet->pPhrase[1];
memcpy(pRet->pPhrase->aToken[0].z, zToken, nToken);
if( iEnd<n && z[iEnd]=='*' ){
pRet->pPhrase->aToken[0].isPrefix = 1;
iEnd++;
}
while( 1 ){
if( !sqlite3_fts3_enable_parentheses
&& iStart>0 && z[iStart-1]=='-'
){
pParse->isNot = 1;
iStart--;
}else if( pParse->bFts4 && iStart>0 && z[iStart-1]=='^' ){
pRet->pPhrase->aToken[0].bFirst = 1;
iStart--;
}else{
break;
}
}
}
*pnConsumed = iEnd;
}else if( i && rc==SQLITE_DONE ){
rc = SQLITE_OK;
}
pModule->xClose(pCursor);
}
*ppExpr = pRet;
return rc;
}
/*
** Enlarge a memory allocation. If an out-of-memory allocation occurs,
** then free the old allocation.
*/
static void *fts3ReallocOrFree(void *pOrig, sqlite3_int64 nNew){
void *pRet = sqlite3_realloc64(pOrig, nNew);
if( !pRet ){
sqlite3_free(pOrig);
}
return pRet;
}
/*
** Buffer zInput, length nInput, contains the contents of a quoted string
** that appeared as part of an fts3 query expression. Neither quote character
** is included in the buffer. This function attempts to tokenize the entire
** input buffer and create an Fts3Expr structure of type FTSQUERY_PHRASE
** containing the results.
**
** If successful, SQLITE_OK is returned and *ppExpr set to point at the
** allocated Fts3Expr structure. Otherwise, either SQLITE_NOMEM (out of memory
** error) or SQLITE_ERROR (tokenization error) is returned and *ppExpr set
** to 0.
*/
static int getNextString(
ParseContext *pParse, /* fts3 query parse context */
const char *zInput, int nInput, /* Input string */
Fts3Expr **ppExpr /* OUT: expression */
){
sqlite3_tokenizer *pTokenizer = pParse->pTokenizer;
sqlite3_tokenizer_module const *pModule = pTokenizer->pModule;
int rc;
Fts3Expr *p = 0;
sqlite3_tokenizer_cursor *pCursor = 0;
char *zTemp = 0;
int nTemp = 0;
const int nSpace = sizeof(Fts3Expr) + sizeof(Fts3Phrase);
int nToken = 0;
/* The final Fts3Expr data structure, including the Fts3Phrase,
** Fts3PhraseToken structures token buffers are all stored as a single
** allocation so that the expression can be freed with a single call to
** sqlite3_free(). Setting this up requires a two pass approach.
**
** The first pass, in the block below, uses a tokenizer cursor to iterate
** through the tokens in the expression. This pass uses fts3ReallocOrFree()
** to assemble data in two dynamic buffers:
**
** Buffer p: Points to the Fts3Expr structure, followed by the Fts3Phrase
** structure, followed by the array of Fts3PhraseToken
** structures. This pass only populates the Fts3PhraseToken array.
**
** Buffer zTemp: Contains copies of all tokens.
**
** The second pass, in the block that begins "if( rc==SQLITE_DONE )" below,
** appends buffer zTemp to buffer p, and fills in the Fts3Expr and Fts3Phrase
** structures.
*/
rc = sqlite3Fts3OpenTokenizer(
pTokenizer, pParse->iLangid, zInput, nInput, &pCursor);
if( rc==SQLITE_OK ){
int ii;
for(ii=0; rc==SQLITE_OK; ii++){
const char *zByte;
int nByte = 0, iBegin = 0, iEnd = 0, iPos = 0;
rc = pModule->xNext(pCursor, &zByte, &nByte, &iBegin, &iEnd, &iPos);
if( rc==SQLITE_OK ){
Fts3PhraseToken *pToken;
p = fts3ReallocOrFree(p, nSpace + ii*sizeof(Fts3PhraseToken));
if( !p ) goto no_mem;
zTemp = fts3ReallocOrFree(zTemp, nTemp + nByte);
if( !zTemp ) goto no_mem;
assert( nToken==ii );
pToken = &((Fts3Phrase *)(&p[1]))->aToken[ii];
memset(pToken, 0, sizeof(Fts3PhraseToken));
memcpy(&zTemp[nTemp], zByte, nByte);
nTemp += nByte;
pToken->n = nByte;
pToken->isPrefix = (iEnd<nInput && zInput[iEnd]=='*');
pToken->bFirst = (iBegin>0 && zInput[iBegin-1]=='^');
nToken = ii+1;
}
}
pModule->xClose(pCursor);
pCursor = 0;
}
if( rc==SQLITE_DONE ){
int jj;
char *zBuf = 0;
p = fts3ReallocOrFree(p, nSpace + nToken*sizeof(Fts3PhraseToken) + nTemp);
if( !p ) goto no_mem;
memset(p, 0, (char *)&(((Fts3Phrase *)&p[1])->aToken[0])-(char *)p);
p->eType = FTSQUERY_PHRASE;
p->pPhrase = (Fts3Phrase *)&p[1];
p->pPhrase->iColumn = pParse->iDefaultCol;
p->pPhrase->nToken = nToken;
zBuf = (char *)&p->pPhrase->aToken[nToken];
if( zTemp ){
memcpy(zBuf, zTemp, nTemp);
sqlite3_free(zTemp);
}else{
assert( nTemp==0 );
}
for(jj=0; jj<p->pPhrase->nToken; jj++){
p->pPhrase->aToken[jj].z = zBuf;
zBuf += p->pPhrase->aToken[jj].n;
}
rc = SQLITE_OK;
}
*ppExpr = p;
return rc;
no_mem:
if( pCursor ){
pModule->xClose(pCursor);
}
sqlite3_free(zTemp);
sqlite3_free(p);
*ppExpr = 0;
return SQLITE_NOMEM;
}
/*
** The output variable *ppExpr is populated with an allocated Fts3Expr
** structure, or set to 0 if the end of the input buffer is reached.
**
** Returns an SQLite error code. SQLITE_OK if everything works, SQLITE_NOMEM
** if a malloc failure occurs, or SQLITE_ERROR if a parse error is encountered.
** If SQLITE_ERROR is returned, pContext is populated with an error message.
*/
static int getNextNode(
ParseContext *pParse, /* fts3 query parse context */
const char *z, int n, /* Input string */
Fts3Expr **ppExpr, /* OUT: expression */
int *pnConsumed /* OUT: Number of bytes consumed */
){
static const struct Fts3Keyword {
char *z; /* Keyword text */
unsigned char n; /* Length of the keyword */
unsigned char parenOnly; /* Only valid in paren mode */
unsigned char eType; /* Keyword code */
} aKeyword[] = {
{ "OR" , 2, 0, FTSQUERY_OR },
{ "AND", 3, 1, FTSQUERY_AND },
{ "NOT", 3, 1, FTSQUERY_NOT },
{ "NEAR", 4, 0, FTSQUERY_NEAR }
};
int ii;
int iCol;
int iColLen;
int rc;
Fts3Expr *pRet = 0;
const char *zInput = z;
int nInput = n;
pParse->isNot = 0;
/* Skip over any whitespace before checking for a keyword, an open or
** close bracket, or a quoted string.
*/
while( nInput>0 && fts3isspace(*zInput) ){
nInput--;
zInput++;
}
if( nInput==0 ){
return SQLITE_DONE;
}
/* See if we are dealing with a keyword. */
for(ii=0; ii<(int)(sizeof(aKeyword)/sizeof(struct Fts3Keyword)); ii++){
const struct Fts3Keyword *pKey = &aKeyword[ii];
if( (pKey->parenOnly & ~sqlite3_fts3_enable_parentheses)!=0 ){
continue;
}
if( nInput>=pKey->n && 0==memcmp(zInput, pKey->z, pKey->n) ){
int nNear = SQLITE_FTS3_DEFAULT_NEAR_PARAM;
int nKey = pKey->n;
char cNext;
/* If this is a "NEAR" keyword, check for an explicit nearness. */
if( pKey->eType==FTSQUERY_NEAR ){
assert( nKey==4 );
if( zInput[4]=='/' && zInput[5]>='0' && zInput[5]<='9' ){
nKey += 1+sqlite3Fts3ReadInt(&zInput[nKey+1], &nNear);
}
}
/* At this point this is probably a keyword. But for that to be true,
** the next byte must contain either whitespace, an open or close
** parenthesis, a quote character, or EOF.
*/
cNext = zInput[nKey];
if( fts3isspace(cNext)
|| cNext=='"' || cNext=='(' || cNext==')' || cNext==0
){
pRet = (Fts3Expr *)sqlite3Fts3MallocZero(sizeof(Fts3Expr));
if( !pRet ){
return SQLITE_NOMEM;
}
pRet->eType = pKey->eType;
pRet->nNear = nNear;
*ppExpr = pRet;
*pnConsumed = (int)((zInput - z) + nKey);
return SQLITE_OK;
}
/* Turns out that wasn't a keyword after all. This happens if the
** user has supplied a token such as "ORacle". Continue.
*/
}
}
/* See if we are dealing with a quoted phrase. If this is the case, then
** search for the closing quote and pass the whole string to getNextString()
** for processing. This is easy to do, as fts3 has no syntax for escaping
** a quote character embedded in a string.
*/
if( *zInput=='"' ){
for(ii=1; ii<nInput && zInput[ii]!='"'; ii++);
*pnConsumed = (int)((zInput - z) + ii + 1);
if( ii==nInput ){
return SQLITE_ERROR;
}
return getNextString(pParse, &zInput[1], ii-1, ppExpr);
}
if( sqlite3_fts3_enable_parentheses ){
if( *zInput=='(' ){
int nConsumed = 0;
pParse->nNest++;
#if !defined(SQLITE_MAX_EXPR_DEPTH)
if( pParse->nNest>1000 ) return SQLITE_ERROR;
#elif SQLITE_MAX_EXPR_DEPTH>0
if( pParse->nNest>SQLITE_MAX_EXPR_DEPTH ) return SQLITE_ERROR;
#endif
rc = fts3ExprParse(pParse, zInput+1, nInput-1, ppExpr, &nConsumed);
*pnConsumed = (int)(zInput - z) + 1 + nConsumed;
return rc;
}else if( *zInput==')' ){
pParse->nNest--;
*pnConsumed = (int)((zInput - z) + 1);
*ppExpr = 0;
return SQLITE_DONE;
}
}
/* If control flows to this point, this must be a regular token, or
** the end of the input. Read a regular token using the sqlite3_tokenizer
** interface. Before doing so, figure out if there is an explicit
** column specifier for the token.
**
** TODO: Strangely, it is not possible to associate a column specifier
** with a quoted phrase, only with a single token. Not sure if this was
** an implementation artifact or an intentional decision when fts3 was
** first implemented. Whichever it was, this module duplicates the
** limitation.
*/
iCol = pParse->iDefaultCol;
iColLen = 0;
for(ii=0; ii<pParse->nCol; ii++){
const char *zStr = pParse->azCol[ii];
int nStr = (int)strlen(zStr);
if( nInput>nStr && zInput[nStr]==':'
&& sqlite3_strnicmp(zStr, zInput, nStr)==0
){
iCol = ii;
iColLen = (int)((zInput - z) + nStr + 1);
break;
}
}
rc = getNextToken(pParse, iCol, &z[iColLen], n-iColLen, ppExpr, pnConsumed);
*pnConsumed += iColLen;
return rc;
}
/*
** The argument is an Fts3Expr structure for a binary operator (any type
** except an FTSQUERY_PHRASE). Return an integer value representing the
** precedence of the operator. Lower values have a higher precedence (i.e.
** group more tightly). For example, in the C language, the == operator
** groups more tightly than ||, and would therefore have a higher precedence.
**
** When using the new fts3 query syntax (when SQLITE_ENABLE_FTS3_PARENTHESIS
** is defined), the order of the operators in precedence from highest to
** lowest is:
**
** NEAR
** NOT
** AND (including implicit ANDs)
** OR
**
** Note that when using the old query syntax, the OR operator has a higher
** precedence than the AND operator.
*/
static int opPrecedence(Fts3Expr *p){
assert( p->eType!=FTSQUERY_PHRASE );
if( sqlite3_fts3_enable_parentheses ){
return p->eType;
}else if( p->eType==FTSQUERY_NEAR ){
return 1;
}else if( p->eType==FTSQUERY_OR ){
return 2;
}
assert( p->eType==FTSQUERY_AND );
return 3;
}
/*
** Argument ppHead contains a pointer to the current head of a query
** expression tree being parsed. pPrev is the expression node most recently
** inserted into the tree. This function adds pNew, which is always a binary
** operator node, into the expression tree based on the relative precedence
** of pNew and the existing nodes of the tree. This may result in the head
** of the tree changing, in which case *ppHead is set to the new root node.
*/
static void insertBinaryOperator(
Fts3Expr **ppHead, /* Pointer to the root node of a tree */
Fts3Expr *pPrev, /* Node most recently inserted into the tree */
Fts3Expr *pNew /* New binary node to insert into expression tree */
){
Fts3Expr *pSplit = pPrev;
while( pSplit->pParent && opPrecedence(pSplit->pParent)<=opPrecedence(pNew) ){
pSplit = pSplit->pParent;
}
if( pSplit->pParent ){
assert( pSplit->pParent->pRight==pSplit );
pSplit->pParent->pRight = pNew;
pNew->pParent = pSplit->pParent;
}else{
*ppHead = pNew;
}
pNew->pLeft = pSplit;
pSplit->pParent = pNew;
}
/*
** Parse the fts3 query expression found in buffer z, length n. This function
** returns either when the end of the buffer is reached or an unmatched
** closing bracket - ')' - is encountered.
**
** If successful, SQLITE_OK is returned, *ppExpr is set to point to the
** parsed form of the expression and *pnConsumed is set to the number of
** bytes read from buffer z. Otherwise, *ppExpr is set to 0 and SQLITE_NOMEM
** (out of memory error) or SQLITE_ERROR (parse error) is returned.
*/
static int fts3ExprParse(
ParseContext *pParse, /* fts3 query parse context */
const char *z, int n, /* Text of MATCH query */
Fts3Expr **ppExpr, /* OUT: Parsed query structure */
int *pnConsumed /* OUT: Number of bytes consumed */
){
Fts3Expr *pRet = 0;
Fts3Expr *pPrev = 0;
Fts3Expr *pNotBranch = 0; /* Only used in legacy parse mode */
int nIn = n;
const char *zIn = z;
int rc = SQLITE_OK;
int isRequirePhrase = 1;
while( rc==SQLITE_OK ){
Fts3Expr *p = 0;
int nByte = 0;
rc = getNextNode(pParse, zIn, nIn, &p, &nByte);
assert( nByte>0 || (rc!=SQLITE_OK && p==0) );
if( rc==SQLITE_OK ){
if( p ){
int isPhrase;
if( !sqlite3_fts3_enable_parentheses
&& p->eType==FTSQUERY_PHRASE && pParse->isNot
){
/* Create an implicit NOT operator. */
Fts3Expr *pNot = sqlite3Fts3MallocZero(sizeof(Fts3Expr));
if( !pNot ){
sqlite3Fts3ExprFree(p);
rc = SQLITE_NOMEM;
goto exprparse_out;
}
pNot->eType = FTSQUERY_NOT;
pNot->pRight = p;
p->pParent = pNot;
if( pNotBranch ){
pNot->pLeft = pNotBranch;
pNotBranch->pParent = pNot;
}
pNotBranch = pNot;
p = pPrev;
}else{
int eType = p->eType;
isPhrase = (eType==FTSQUERY_PHRASE || p->pLeft);
/* The isRequirePhrase variable is set to true if a phrase or
** an expression contained in parenthesis is required. If a
** binary operator (AND, OR, NOT or NEAR) is encounted when
** isRequirePhrase is set, this is a syntax error.
*/
if( !isPhrase && isRequirePhrase ){
sqlite3Fts3ExprFree(p);
rc = SQLITE_ERROR;
goto exprparse_out;
}
if( isPhrase && !isRequirePhrase ){
/* Insert an implicit AND operator. */
Fts3Expr *pAnd;
assert( pRet && pPrev );
pAnd = sqlite3Fts3MallocZero(sizeof(Fts3Expr));
if( !pAnd ){
sqlite3Fts3ExprFree(p);
rc = SQLITE_NOMEM;
goto exprparse_out;
}
pAnd->eType = FTSQUERY_AND;
insertBinaryOperator(&pRet, pPrev, pAnd);
pPrev = pAnd;
}
/* This test catches attempts to make either operand of a NEAR
** operator something other than a phrase. For example, either of
** the following:
**
** (bracketed expression) NEAR phrase
** phrase NEAR (bracketed expression)
**
** Return an error in either case.
*/
if( pPrev && (
(eType==FTSQUERY_NEAR && !isPhrase && pPrev->eType!=FTSQUERY_PHRASE)
|| (eType!=FTSQUERY_PHRASE && isPhrase && pPrev->eType==FTSQUERY_NEAR)
)){
sqlite3Fts3ExprFree(p);
rc = SQLITE_ERROR;
goto exprparse_out;
}
if( isPhrase ){
if( pRet ){
assert( pPrev && pPrev->pLeft && pPrev->pRight==0 );
pPrev->pRight = p;
p->pParent = pPrev;
}else{
pRet = p;
}
}else{
insertBinaryOperator(&pRet, pPrev, p);
}
isRequirePhrase = !isPhrase;
}
pPrev = p;
}
assert( nByte>0 );
}
assert( rc!=SQLITE_OK || (nByte>0 && nByte<=nIn) );
nIn -= nByte;
zIn += nByte;
}
if( rc==SQLITE_DONE && pRet && isRequirePhrase ){
rc = SQLITE_ERROR;
}
if( rc==SQLITE_DONE ){
rc = SQLITE_OK;
if( !sqlite3_fts3_enable_parentheses && pNotBranch ){
if( !pRet ){
rc = SQLITE_ERROR;
}else{
Fts3Expr *pIter = pNotBranch;
while( pIter->pLeft ){
pIter = pIter->pLeft;
}
pIter->pLeft = pRet;
pRet->pParent = pIter;
pRet = pNotBranch;
}
}
}
*pnConsumed = n - nIn;
exprparse_out:
if( rc!=SQLITE_OK ){
sqlite3Fts3ExprFree(pRet);
sqlite3Fts3ExprFree(pNotBranch);
pRet = 0;
}
*ppExpr = pRet;
return rc;
}
/*
** Return SQLITE_ERROR if the maximum depth of the expression tree passed
** as the only argument is more than nMaxDepth.
*/
static int fts3ExprCheckDepth(Fts3Expr *p, int nMaxDepth){
int rc = SQLITE_OK;
if( p ){
if( nMaxDepth<0 ){
rc = SQLITE_TOOBIG;
}else{
rc = fts3ExprCheckDepth(p->pLeft, nMaxDepth-1);
if( rc==SQLITE_OK ){
rc = fts3ExprCheckDepth(p->pRight, nMaxDepth-1);
}
}
}
return rc;
}
/*
** This function attempts to transform the expression tree at (*pp) to
** an equivalent but more balanced form. The tree is modified in place.
** If successful, SQLITE_OK is returned and (*pp) set to point to the
** new root expression node.
**
** nMaxDepth is the maximum allowable depth of the balanced sub-tree.
**
** Otherwise, if an error occurs, an SQLite error code is returned and
** expression (*pp) freed.
*/
static int fts3ExprBalance(Fts3Expr **pp, int nMaxDepth){
int rc = SQLITE_OK; /* Return code */
Fts3Expr *pRoot = *pp; /* Initial root node */
Fts3Expr *pFree = 0; /* List of free nodes. Linked by pParent. */
int eType = pRoot->eType; /* Type of node in this tree */
if( nMaxDepth==0 ){
rc = SQLITE_ERROR;
}
if( rc==SQLITE_OK ){
if( (eType==FTSQUERY_AND || eType==FTSQUERY_OR) ){
Fts3Expr **apLeaf;
apLeaf = (Fts3Expr **)sqlite3_malloc64(sizeof(Fts3Expr *) * nMaxDepth);
if( 0==apLeaf ){
rc = SQLITE_NOMEM;
}else{
memset(apLeaf, 0, sizeof(Fts3Expr *) * nMaxDepth);
}
if( rc==SQLITE_OK ){
int i;
Fts3Expr *p;
/* Set $p to point to the left-most leaf in the tree of eType nodes. */
for(p=pRoot; p->eType==eType; p=p->pLeft){
assert( p->pParent==0 || p->pParent->pLeft==p );
assert( p->pLeft && p->pRight );
}
/* This loop runs once for each leaf in the tree of eType nodes. */
while( 1 ){
int iLvl;
Fts3Expr *pParent = p->pParent; /* Current parent of p */
assert( pParent==0 || pParent->pLeft==p );
p->pParent = 0;
if( pParent ){
pParent->pLeft = 0;
}else{
pRoot = 0;
}
rc = fts3ExprBalance(&p, nMaxDepth-1);
if( rc!=SQLITE_OK ) break;
for(iLvl=0; p && iLvl<nMaxDepth; iLvl++){
if( apLeaf[iLvl]==0 ){
apLeaf[iLvl] = p;
p = 0;
}else{
assert( pFree );
pFree->pLeft = apLeaf[iLvl];
pFree->pRight = p;
pFree->pLeft->pParent = pFree;
pFree->pRight->pParent = pFree;
p = pFree;
pFree = pFree->pParent;
p->pParent = 0;
apLeaf[iLvl] = 0;
}
}
if( p ){
sqlite3Fts3ExprFree(p);
rc = SQLITE_TOOBIG;
break;
}
/* If that was the last leaf node, break out of the loop */
if( pParent==0 ) break;
/* Set $p to point to the next leaf in the tree of eType nodes */
for(p=pParent->pRight; p->eType==eType; p=p->pLeft);
/* Remove pParent from the original tree. */
assert( pParent->pParent==0 || pParent->pParent->pLeft==pParent );
pParent->pRight->pParent = pParent->pParent;
if( pParent->pParent ){
pParent->pParent->pLeft = pParent->pRight;
}else{
assert( pParent==pRoot );
pRoot = pParent->pRight;
}
/* Link pParent into the free node list. It will be used as an
** internal node of the new tree. */
pParent->pParent = pFree;
pFree = pParent;
}
if( rc==SQLITE_OK ){
p = 0;
for(i=0; i<nMaxDepth; i++){
if( apLeaf[i] ){
if( p==0 ){
p = apLeaf[i];
p->pParent = 0;
}else{
assert( pFree!=0 );
pFree->pRight = p;
pFree->pLeft = apLeaf[i];
pFree->pLeft->pParent = pFree;
pFree->pRight->pParent = pFree;
p = pFree;
pFree = pFree->pParent;
p->pParent = 0;
}
}
}
pRoot = p;
}else{
/* An error occurred. Delete the contents of the apLeaf[] array
** and pFree list. Everything else is cleaned up by the call to
** sqlite3Fts3ExprFree(pRoot) below. */
Fts3Expr *pDel;
for(i=0; i<nMaxDepth; i++){
sqlite3Fts3ExprFree(apLeaf[i]);
}
while( (pDel=pFree)!=0 ){
pFree = pDel->pParent;
sqlite3_free(pDel);
}
}
assert( pFree==0 );
sqlite3_free( apLeaf );
}
}else if( eType==FTSQUERY_NOT ){
Fts3Expr *pLeft = pRoot->pLeft;
Fts3Expr *pRight = pRoot->pRight;
pRoot->pLeft = 0;
pRoot->pRight = 0;
pLeft->pParent = 0;
pRight->pParent = 0;
rc = fts3ExprBalance(&pLeft, nMaxDepth-1);
if( rc==SQLITE_OK ){
rc = fts3ExprBalance(&pRight, nMaxDepth-1);
}
if( rc!=SQLITE_OK ){
sqlite3Fts3ExprFree(pRight);
sqlite3Fts3ExprFree(pLeft);
}else{
assert( pLeft && pRight );
pRoot->pLeft = pLeft;
pLeft->pParent = pRoot;
pRoot->pRight = pRight;
pRight->pParent = pRoot;
}
}
}
if( rc!=SQLITE_OK ){
sqlite3Fts3ExprFree(pRoot);
pRoot = 0;
}
*pp = pRoot;
return rc;
}
/*
** This function is similar to sqlite3Fts3ExprParse(), with the following
** differences:
**
** 1. It does not do expression rebalancing.
** 2. It does not check that the expression does not exceed the
** maximum allowable depth.
** 3. Even if it fails, *ppExpr may still be set to point to an
** expression tree. It should be deleted using sqlite3Fts3ExprFree()
** in this case.
*/
static int fts3ExprParseUnbalanced(
sqlite3_tokenizer *pTokenizer, /* Tokenizer module */
int iLangid, /* Language id for tokenizer */
char **azCol, /* Array of column names for fts3 table */
int bFts4, /* True to allow FTS4-only syntax */
int nCol, /* Number of entries in azCol[] */
int iDefaultCol, /* Default column to query */
const char *z, int n, /* Text of MATCH query */
Fts3Expr **ppExpr /* OUT: Parsed query structure */
){
int nParsed;
int rc;
ParseContext sParse;
memset(&sParse, 0, sizeof(ParseContext));
sParse.pTokenizer = pTokenizer;
sParse.iLangid = iLangid;
sParse.azCol = (const char **)azCol;
sParse.nCol = nCol;
sParse.iDefaultCol = iDefaultCol;
sParse.bFts4 = bFts4;
if( z==0 ){
*ppExpr = 0;
return SQLITE_OK;
}
if( n<0 ){
n = (int)strlen(z);
}
rc = fts3ExprParse(&sParse, z, n, ppExpr, &nParsed);
assert( rc==SQLITE_OK || *ppExpr==0 );
/* Check for mismatched parenthesis */
if( rc==SQLITE_OK && sParse.nNest ){
rc = SQLITE_ERROR;
}
return rc;
}
/*
** Parameters z and n contain a pointer to and length of a buffer containing
** an fts3 query expression, respectively. This function attempts to parse the
** query expression and create a tree of Fts3Expr structures representing the
** parsed expression. If successful, *ppExpr is set to point to the head
** of the parsed expression tree and SQLITE_OK is returned. If an error
** occurs, either SQLITE_NOMEM (out-of-memory error) or SQLITE_ERROR (parse
** error) is returned and *ppExpr is set to 0.
**
** If parameter n is a negative number, then z is assumed to point to a
** nul-terminated string and the length is determined using strlen().
**
** The first parameter, pTokenizer, is passed the fts3 tokenizer module to
** use to normalize query tokens while parsing the expression. The azCol[]
** array, which is assumed to contain nCol entries, should contain the names
** of each column in the target fts3 table, in order from left to right.
** Column names must be nul-terminated strings.
**
** The iDefaultCol parameter should be passed the index of the table column
** that appears on the left-hand-side of the MATCH operator (the default
** column to match against for tokens for which a column name is not explicitly
** specified as part of the query string), or -1 if tokens may by default
** match any table column.
*/
int sqlite3Fts3ExprParse(
sqlite3_tokenizer *pTokenizer, /* Tokenizer module */
int iLangid, /* Language id for tokenizer */
char **azCol, /* Array of column names for fts3 table */
int bFts4, /* True to allow FTS4-only syntax */
int nCol, /* Number of entries in azCol[] */
int iDefaultCol, /* Default column to query */
const char *z, int n, /* Text of MATCH query */
Fts3Expr **ppExpr, /* OUT: Parsed query structure */
char **pzErr /* OUT: Error message (sqlite3_malloc) */
){
int rc = fts3ExprParseUnbalanced(
pTokenizer, iLangid, azCol, bFts4, nCol, iDefaultCol, z, n, ppExpr
);
/* Rebalance the expression. And check that its depth does not exceed
** SQLITE_FTS3_MAX_EXPR_DEPTH. */
if( rc==SQLITE_OK && *ppExpr ){
rc = fts3ExprBalance(ppExpr, SQLITE_FTS3_MAX_EXPR_DEPTH);
if( rc==SQLITE_OK ){
rc = fts3ExprCheckDepth(*ppExpr, SQLITE_FTS3_MAX_EXPR_DEPTH);
}
}
if( rc!=SQLITE_OK ){
sqlite3Fts3ExprFree(*ppExpr);
*ppExpr = 0;
if( rc==SQLITE_TOOBIG ){
sqlite3Fts3ErrMsg(pzErr,
"FTS expression tree is too large (maximum depth %d)",
SQLITE_FTS3_MAX_EXPR_DEPTH
);
rc = SQLITE_ERROR;
}else if( rc==SQLITE_ERROR ){
sqlite3Fts3ErrMsg(pzErr, "malformed MATCH expression: [%s]", z);
}
}
return rc;
}
/*
** Free a single node of an expression tree.
*/
static void fts3FreeExprNode(Fts3Expr *p){
assert( p->eType==FTSQUERY_PHRASE || p->pPhrase==0 );
sqlite3Fts3EvalPhraseCleanup(p->pPhrase);
sqlite3_free(p->aMI);
sqlite3_free(p);
}
/*
** Free a parsed fts3 query expression allocated by sqlite3Fts3ExprParse().
**
** This function would be simpler if it recursively called itself. But
** that would mean passing a sufficiently large expression to ExprParse()
** could cause a stack overflow.
*/
void sqlite3Fts3ExprFree(Fts3Expr *pDel){
Fts3Expr *p;
assert( pDel==0 || pDel->pParent==0 );
for(p=pDel; p && (p->pLeft||p->pRight); p=(p->pLeft ? p->pLeft : p->pRight)){
assert( p->pParent==0 || p==p->pParent->pRight || p==p->pParent->pLeft );
}
while( p ){
Fts3Expr *pParent = p->pParent;
fts3FreeExprNode(p);
if( pParent && p==pParent->pLeft && pParent->pRight ){
p = pParent->pRight;
while( p && (p->pLeft || p->pRight) ){
assert( p==p->pParent->pRight || p==p->pParent->pLeft );
p = (p->pLeft ? p->pLeft : p->pRight);
}
}else{
p = pParent;
}
}
}
/****************************************************************************
*****************************************************************************
** Everything after this point is just test code.
*/
#ifdef SQLITE_TEST
#include <stdio.h>
/*
** Return a pointer to a buffer containing a text representation of the
** expression passed as the first argument. The buffer is obtained from
** sqlite3_malloc(). It is the responsibility of the caller to use
** sqlite3_free() to release the memory. If an OOM condition is encountered,
** NULL is returned.
**
** If the second argument is not NULL, then its contents are prepended to
** the returned expression text and then freed using sqlite3_free().
*/
static char *exprToString(Fts3Expr *pExpr, char *zBuf){
if( pExpr==0 ){
return sqlite3_mprintf("");
}
switch( pExpr->eType ){
case FTSQUERY_PHRASE: {
Fts3Phrase *pPhrase = pExpr->pPhrase;
int i;
zBuf = sqlite3_mprintf(
"%zPHRASE %d 0", zBuf, pPhrase->iColumn);
for(i=0; zBuf && i<pPhrase->nToken; i++){
zBuf = sqlite3_mprintf("%z %.*s%s", zBuf,
pPhrase->aToken[i].n, pPhrase->aToken[i].z,
(pPhrase->aToken[i].isPrefix?"+":"")
);
}
return zBuf;
}
case FTSQUERY_NEAR:
zBuf = sqlite3_mprintf("%zNEAR/%d ", zBuf, pExpr->nNear);
break;
case FTSQUERY_NOT:
zBuf = sqlite3_mprintf("%zNOT ", zBuf);
break;
case FTSQUERY_AND:
zBuf = sqlite3_mprintf("%zAND ", zBuf);
break;
case FTSQUERY_OR:
zBuf = sqlite3_mprintf("%zOR ", zBuf);
break;
}
if( zBuf ) zBuf = sqlite3_mprintf("%z{", zBuf);
if( zBuf ) zBuf = exprToString(pExpr->pLeft, zBuf);
if( zBuf ) zBuf = sqlite3_mprintf("%z} {", zBuf);
if( zBuf ) zBuf = exprToString(pExpr->pRight, zBuf);
if( zBuf ) zBuf = sqlite3_mprintf("%z}", zBuf);
return zBuf;
}
/*
** This is the implementation of a scalar SQL function used to test the
** expression parser. It should be called as follows:
**
** fts3_exprtest(<tokenizer>, <expr>, <column 1>, ...);
**
** The first argument, <tokenizer>, is the name of the fts3 tokenizer used
** to parse the query expression (see README.tokenizers). The second argument
** is the query expression to parse. Each subsequent argument is the name
** of a column of the fts3 table that the query expression may refer to.
** For example:
**
** SELECT fts3_exprtest('simple', 'Bill col2:Bloggs', 'col1', 'col2');
*/
static void fts3ExprTestCommon(
int bRebalance,
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
sqlite3_tokenizer *pTokenizer = 0;
int rc;
char **azCol = 0;
const char *zExpr;
int nExpr;
int nCol;
int ii;
Fts3Expr *pExpr;
char *zBuf = 0;
Fts3Hash *pHash = (Fts3Hash*)sqlite3_user_data(context);
const char *zTokenizer = 0;
char *zErr = 0;
if( argc<3 ){
sqlite3_result_error(context,
"Usage: fts3_exprtest(tokenizer, expr, col1, ...", -1
);
return;
}
zTokenizer = (const char*)sqlite3_value_text(argv[0]);
rc = sqlite3Fts3InitTokenizer(pHash, zTokenizer, &pTokenizer, &zErr);
if( rc!=SQLITE_OK ){
if( rc==SQLITE_NOMEM ){
sqlite3_result_error_nomem(context);
}else{
sqlite3_result_error(context, zErr, -1);
}
sqlite3_free(zErr);
return;
}
zExpr = (const char *)sqlite3_value_text(argv[1]);
nExpr = sqlite3_value_bytes(argv[1]);
nCol = argc-2;
azCol = (char **)sqlite3_malloc64(nCol*sizeof(char *));
if( !azCol ){
sqlite3_result_error_nomem(context);
goto exprtest_out;
}
for(ii=0; ii<nCol; ii++){
azCol[ii] = (char *)sqlite3_value_text(argv[ii+2]);
}
if( bRebalance ){
char *zDummy = 0;
rc = sqlite3Fts3ExprParse(
pTokenizer, 0, azCol, 0, nCol, nCol, zExpr, nExpr, &pExpr, &zDummy
);
assert( rc==SQLITE_OK || pExpr==0 );
sqlite3_free(zDummy);
}else{
rc = fts3ExprParseUnbalanced(
pTokenizer, 0, azCol, 0, nCol, nCol, zExpr, nExpr, &pExpr
);
}
if( rc!=SQLITE_OK && rc!=SQLITE_NOMEM ){
sqlite3Fts3ExprFree(pExpr);
sqlite3_result_error(context, "Error parsing expression", -1);
}else if( rc==SQLITE_NOMEM || !(zBuf = exprToString(pExpr, 0)) ){
sqlite3_result_error_nomem(context);
}else{
sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
sqlite3_free(zBuf);
}
sqlite3Fts3ExprFree(pExpr);
exprtest_out:
if( pTokenizer ){
rc = pTokenizer->pModule->xDestroy(pTokenizer);
}
sqlite3_free(azCol);
}
static void fts3ExprTest(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
fts3ExprTestCommon(0, context, argc, argv);
}
static void fts3ExprTestRebalance(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
fts3ExprTestCommon(1, context, argc, argv);
}
/*
** Register the query expression parser test function fts3_exprtest()
** with database connection db.
*/
int sqlite3Fts3ExprInitTestInterface(sqlite3 *db, Fts3Hash *pHash){
int rc = sqlite3_create_function(
db, "fts3_exprtest", -1, SQLITE_UTF8, (void*)pHash, fts3ExprTest, 0, 0
);
if( rc==SQLITE_OK ){
rc = sqlite3_create_function(db, "fts3_exprtest_rebalance",
-1, SQLITE_UTF8, (void*)pHash, fts3ExprTestRebalance, 0, 0
);
}
return rc;
}
#endif
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
| 41,496 | 1,294 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/where.shell.c | #include "third_party/sqlite3/where.c"
| 39 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/sqlite3session.shell.c | #include "third_party/sqlite3/sqlite3session.c"
| 48 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/os_unix.shell.c | #include "third_party/sqlite3/os_unix.c"
| 41 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/vdbeapi.shell.c | #include "third_party/sqlite3/vdbeapi.c"
| 41 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/backup.shell.c | #include "third_party/sqlite3/backup.c"
| 40 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/utf.c | /*
** 2004 April 13
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains routines used to translate between UTF-8,
** UTF-16, UTF-16BE, and UTF-16LE.
**
** Notes on UTF-8:
**
** Byte-0 Byte-1 Byte-2 Byte-3 Value
** 0xxxxxxx 00000000 00000000 0xxxxxxx
** 110yyyyy 10xxxxxx 00000000 00000yyy yyxxxxxx
** 1110zzzz 10yyyyyy 10xxxxxx 00000000 zzzzyyyy yyxxxxxx
** 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx 000uuuuu zzzzyyyy yyxxxxxx
**
**
** Notes on UTF-16: (with wwww+1==uuuuu)
**
** Word-0 Word-1 Value
** 110110ww wwzzzzyy 110111yy yyxxxxxx 000uuuuu zzzzyyyy yyxxxxxx
** zzzzyyyy yyxxxxxx 00000000 zzzzyyyy yyxxxxxx
**
**
** BOM or Byte Order Mark:
** 0xff 0xfe little-endian utf-16 follows
** 0xfe 0xff big-endian utf-16 follows
**
*/
#include "third_party/sqlite3/sqliteInt.h"
#include "libc/assert.h"
#include "third_party/sqlite3/vdbeInt.inc"
#if !defined(SQLITE_AMALGAMATION) && SQLITE_BYTEORDER==0
/*
** The following constant value is used by the SQLITE_BIGENDIAN and
** SQLITE_LITTLEENDIAN macros.
*/
const int sqlite3one = 1;
#endif /* SQLITE_AMALGAMATION && SQLITE_BYTEORDER==0 */
/*
** This lookup table is used to help decode the first byte of
** a multi-byte UTF8 character.
*/
static const unsigned char sqlite3Utf8Trans1[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
};
#define WRITE_UTF8(zOut, c) { \
if( c<0x00080 ){ \
*zOut++ = (u8)(c&0xFF); \
} \
else if( c<0x00800 ){ \
*zOut++ = 0xC0 + (u8)((c>>6)&0x1F); \
*zOut++ = 0x80 + (u8)(c & 0x3F); \
} \
else if( c<0x10000 ){ \
*zOut++ = 0xE0 + (u8)((c>>12)&0x0F); \
*zOut++ = 0x80 + (u8)((c>>6) & 0x3F); \
*zOut++ = 0x80 + (u8)(c & 0x3F); \
}else{ \
*zOut++ = 0xF0 + (u8)((c>>18) & 0x07); \
*zOut++ = 0x80 + (u8)((c>>12) & 0x3F); \
*zOut++ = 0x80 + (u8)((c>>6) & 0x3F); \
*zOut++ = 0x80 + (u8)(c & 0x3F); \
} \
}
#define WRITE_UTF16LE(zOut, c) { \
if( c<=0xFFFF ){ \
*zOut++ = (u8)(c&0x00FF); \
*zOut++ = (u8)((c>>8)&0x00FF); \
}else{ \
*zOut++ = (u8)(((c>>10)&0x003F) + (((c-0x10000)>>10)&0x00C0)); \
*zOut++ = (u8)(0x00D8 + (((c-0x10000)>>18)&0x03)); \
*zOut++ = (u8)(c&0x00FF); \
*zOut++ = (u8)(0x00DC + ((c>>8)&0x03)); \
} \
}
#define WRITE_UTF16BE(zOut, c) { \
if( c<=0xFFFF ){ \
*zOut++ = (u8)((c>>8)&0x00FF); \
*zOut++ = (u8)(c&0x00FF); \
}else{ \
*zOut++ = (u8)(0x00D8 + (((c-0x10000)>>18)&0x03)); \
*zOut++ = (u8)(((c>>10)&0x003F) + (((c-0x10000)>>10)&0x00C0)); \
*zOut++ = (u8)(0x00DC + ((c>>8)&0x03)); \
*zOut++ = (u8)(c&0x00FF); \
} \
}
/*
** Translate a single UTF-8 character. Return the unicode value.
**
** During translation, assume that the byte that zTerm points
** is a 0x00.
**
** Write a pointer to the next unread byte back into *pzNext.
**
** Notes On Invalid UTF-8:
**
** * This routine never allows a 7-bit character (0x00 through 0x7f) to
** be encoded as a multi-byte character. Any multi-byte character that
** attempts to encode a value between 0x00 and 0x7f is rendered as 0xfffd.
**
** * This routine never allows a UTF16 surrogate value to be encoded.
** If a multi-byte character attempts to encode a value between
** 0xd800 and 0xe000 then it is rendered as 0xfffd.
**
** * Bytes in the range of 0x80 through 0xbf which occur as the first
** byte of a character are interpreted as single-byte characters
** and rendered as themselves even though they are technically
** invalid characters.
**
** * This routine accepts over-length UTF8 encodings
** for unicode values 0x80 and greater. It does not change over-length
** encodings to 0xfffd as some systems recommend.
*/
#define READ_UTF8(zIn, zTerm, c) \
c = *(zIn++); \
if( c>=0xc0 ){ \
c = sqlite3Utf8Trans1[c-0xc0]; \
while( zIn!=zTerm && (*zIn & 0xc0)==0x80 ){ \
c = (c<<6) + (0x3f & *(zIn++)); \
} \
if( c<0x80 \
|| (c&0xFFFFF800)==0xD800 \
|| (c&0xFFFFFFFE)==0xFFFE ){ c = 0xFFFD; } \
}
u32 sqlite3Utf8Read(
const unsigned char **pz /* Pointer to string from which to read char */
){
unsigned int c;
/* Same as READ_UTF8() above but without the zTerm parameter.
** For this routine, we assume the UTF8 string is always zero-terminated.
*/
c = *((*pz)++);
if( c>=0xc0 ){
c = sqlite3Utf8Trans1[c-0xc0];
while( (*(*pz) & 0xc0)==0x80 ){
c = (c<<6) + (0x3f & *((*pz)++));
}
if( c<0x80
|| (c&0xFFFFF800)==0xD800
|| (c&0xFFFFFFFE)==0xFFFE ){ c = 0xFFFD; }
}
return c;
}
/*
** If the TRANSLATE_TRACE macro is defined, the value of each Mem is
** printed on stderr on the way into and out of sqlite3VdbeMemTranslate().
*/
/* #define TRANSLATE_TRACE 1 */
#ifndef SQLITE_OMIT_UTF16
/*
** This routine transforms the internal text encoding used by pMem to
** desiredEnc. It is an error if the string is already of the desired
** encoding, or if *pMem does not contain a string value.
*/
SQLITE_NOINLINE int sqlite3VdbeMemTranslate(Mem *pMem, u8 desiredEnc){
sqlite3_int64 len; /* Maximum length of output string in bytes */
unsigned char *zOut; /* Output buffer */
unsigned char *zIn; /* Input iterator */
unsigned char *zTerm; /* End of input */
unsigned char *z; /* Output iterator */
unsigned int c;
assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
assert( pMem->flags&MEM_Str );
assert( pMem->enc!=desiredEnc );
assert( pMem->enc!=0 );
assert( pMem->n>=0 );
#if defined(TRANSLATE_TRACE) && defined(SQLITE_DEBUG)
{
StrAccum acc;
char zBuf[1000];
sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
sqlite3VdbeMemPrettyPrint(pMem, &acc);
fprintf(stderr, "INPUT: %s\n", sqlite3StrAccumFinish(&acc));
}
#endif
/* If the translation is between UTF-16 little and big endian, then
** all that is required is to swap the byte order. This case is handled
** differently from the others.
*/
if( pMem->enc!=SQLITE_UTF8 && desiredEnc!=SQLITE_UTF8 ){
u8 temp;
int rc;
rc = sqlite3VdbeMemMakeWriteable(pMem);
if( rc!=SQLITE_OK ){
assert( rc==SQLITE_NOMEM );
return SQLITE_NOMEM_BKPT;
}
zIn = (u8*)pMem->z;
zTerm = &zIn[pMem->n&~1];
while( zIn<zTerm ){
temp = *zIn;
*zIn = *(zIn+1);
zIn++;
*zIn++ = temp;
}
pMem->enc = desiredEnc;
goto translate_out;
}
/* Set len to the maximum number of bytes required in the output buffer. */
if( desiredEnc==SQLITE_UTF8 ){
/* When converting from UTF-16, the maximum growth results from
** translating a 2-byte character to a 4-byte UTF-8 character.
** A single byte is required for the output string
** nul-terminator.
*/
pMem->n &= ~1;
len = 2 * (sqlite3_int64)pMem->n + 1;
}else{
/* When converting from UTF-8 to UTF-16 the maximum growth is caused
** when a 1-byte UTF-8 character is translated into a 2-byte UTF-16
** character. Two bytes are required in the output buffer for the
** nul-terminator.
*/
len = 2 * (sqlite3_int64)pMem->n + 2;
}
/* Set zIn to point at the start of the input buffer and zTerm to point 1
** byte past the end.
**
** Variable zOut is set to point at the output buffer, space obtained
** from sqlite3_malloc().
*/
zIn = (u8*)pMem->z;
zTerm = &zIn[pMem->n];
zOut = sqlite3DbMallocRaw(pMem->db, len);
if( !zOut ){
return SQLITE_NOMEM_BKPT;
}
z = zOut;
if( pMem->enc==SQLITE_UTF8 ){
if( desiredEnc==SQLITE_UTF16LE ){
/* UTF-8 -> UTF-16 Little-endian */
while( zIn<zTerm ){
READ_UTF8(zIn, zTerm, c);
WRITE_UTF16LE(z, c);
}
}else{
assert( desiredEnc==SQLITE_UTF16BE );
/* UTF-8 -> UTF-16 Big-endian */
while( zIn<zTerm ){
READ_UTF8(zIn, zTerm, c);
WRITE_UTF16BE(z, c);
}
}
pMem->n = (int)(z - zOut);
*z++ = 0;
}else{
assert( desiredEnc==SQLITE_UTF8 );
if( pMem->enc==SQLITE_UTF16LE ){
/* UTF-16 Little-endian -> UTF-8 */
while( zIn<zTerm ){
c = *(zIn++);
c += (*(zIn++))<<8;
if( c>=0xd800 && c<0xe000 ){
#ifdef SQLITE_REPLACE_INVALID_UTF
if( c>=0xdc00 || zIn>=zTerm ){
c = 0xfffd;
}else{
int c2 = *(zIn++);
c2 += (*(zIn++))<<8;
if( c2<0xdc00 || c2>=0xe000 ){
zIn -= 2;
c = 0xfffd;
}else{
c = ((c&0x3ff)<<10) + (c2&0x3ff) + 0x10000;
}
}
#else
if( zIn<zTerm ){
int c2 = (*zIn++);
c2 += ((*zIn++)<<8);
c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10);
}
#endif
}
WRITE_UTF8(z, c);
}
}else{
/* UTF-16 Big-endian -> UTF-8 */
while( zIn<zTerm ){
c = (*(zIn++))<<8;
c += *(zIn++);
if( c>=0xd800 && c<0xe000 ){
#ifdef SQLITE_REPLACE_INVALID_UTF
if( c>=0xdc00 || zIn>=zTerm ){
c = 0xfffd;
}else{
int c2 = (*(zIn++))<<8;
c2 += *(zIn++);
if( c2<0xdc00 || c2>=0xe000 ){
zIn -= 2;
c = 0xfffd;
}else{
c = ((c&0x3ff)<<10) + (c2&0x3ff) + 0x10000;
}
}
#else
if( zIn<zTerm ){
int c2 = ((*zIn++)<<8);
c2 += (*zIn++);
c = (c2&0x03FF) + ((c&0x003F)<<10) + (((c&0x03C0)+0x0040)<<10);
}
#endif
}
WRITE_UTF8(z, c);
}
}
pMem->n = (int)(z - zOut);
}
*z = 0;
assert( (pMem->n+(desiredEnc==SQLITE_UTF8?1:2))<=len );
c = MEM_Str|MEM_Term|(pMem->flags&(MEM_AffMask|MEM_Subtype));
sqlite3VdbeMemRelease(pMem);
pMem->flags = c;
pMem->enc = desiredEnc;
pMem->z = (char*)zOut;
pMem->zMalloc = pMem->z;
pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->z);
translate_out:
#if defined(TRANSLATE_TRACE) && defined(SQLITE_DEBUG)
{
StrAccum acc;
char zBuf[1000];
sqlite3StrAccumInit(&acc, 0, zBuf, sizeof(zBuf), 0);
sqlite3VdbeMemPrettyPrint(pMem, &acc);
fprintf(stderr, "OUTPUT: %s\n", sqlite3StrAccumFinish(&acc));
}
#endif
return SQLITE_OK;
}
#endif /* SQLITE_OMIT_UTF16 */
#ifndef SQLITE_OMIT_UTF16
/*
** This routine checks for a byte-order mark at the beginning of the
** UTF-16 string stored in *pMem. If one is present, it is removed and
** the encoding of the Mem adjusted. This routine does not do any
** byte-swapping, it just sets Mem.enc appropriately.
**
** The allocation (static, dynamic etc.) and encoding of the Mem may be
** changed by this function.
*/
int sqlite3VdbeMemHandleBom(Mem *pMem){
int rc = SQLITE_OK;
u8 bom = 0;
assert( pMem->n>=0 );
if( pMem->n>1 ){
u8 b1 = *(u8 *)pMem->z;
u8 b2 = *(((u8 *)pMem->z) + 1);
if( b1==0xFE && b2==0xFF ){
bom = SQLITE_UTF16BE;
}
if( b1==0xFF && b2==0xFE ){
bom = SQLITE_UTF16LE;
}
}
if( bom ){
rc = sqlite3VdbeMemMakeWriteable(pMem);
if( rc==SQLITE_OK ){
pMem->n -= 2;
memmove(pMem->z, &pMem->z[2], pMem->n);
pMem->z[pMem->n] = '\0';
pMem->z[pMem->n+1] = '\0';
pMem->flags |= MEM_Term;
pMem->enc = bom;
}
}
return rc;
}
#endif /* SQLITE_OMIT_UTF16 */
/*
** pZ is a UTF-8 encoded unicode string. If nByte is less than zero,
** return the number of unicode characters in pZ up to (but not including)
** the first 0x00 byte. If nByte is not less than zero, return the
** number of unicode characters in the first nByte of pZ (or up to
** the first 0x00, whichever comes first).
*/
int sqlite3Utf8CharLen(const char *zIn, int nByte){
int r = 0;
const u8 *z = (const u8*)zIn;
const u8 *zTerm;
if( nByte>=0 ){
zTerm = &z[nByte];
}else{
zTerm = (const u8*)(-1);
}
assert( z<=zTerm );
while( *z!=0 && z<zTerm ){
SQLITE_SKIP_UTF8(z);
r++;
}
return r;
}
/* This test function is not currently used by the automated test-suite.
** Hence it is only available in debug builds.
*/
#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
/*
** Translate UTF-8 to UTF-8.
**
** This has the effect of making sure that the string is well-formed
** UTF-8. Miscoded characters are removed.
**
** The translation is done in-place and aborted if the output
** overruns the input.
*/
int sqlite3Utf8To8(unsigned char *zIn){
unsigned char *zOut = zIn;
unsigned char *zStart = zIn;
u32 c;
while( zIn[0] && zOut<=zIn ){
c = sqlite3Utf8Read((const u8**)&zIn);
if( c!=0xfffd ){
WRITE_UTF8(zOut, c);
}
}
*zOut = 0;
return (int)(zOut - zStart);
}
#endif
#ifndef SQLITE_OMIT_UTF16
/*
** Convert a UTF-16 string in the native encoding into a UTF-8 string.
** Memory to hold the UTF-8 string is obtained from sqlite3_malloc and must
** be freed by the calling function.
**
** NULL is returned if there is an allocation error.
*/
char *sqlite3Utf16to8(sqlite3 *db, const void *z, int nByte, u8 enc){
Mem m;
memset(&m, 0, sizeof(m));
m.db = db;
sqlite3VdbeMemSetStr(&m, z, nByte, enc, SQLITE_STATIC);
sqlite3VdbeChangeEncoding(&m, SQLITE_UTF8);
if( db->mallocFailed ){
sqlite3VdbeMemRelease(&m);
m.z = 0;
}
assert( (m.flags & MEM_Term)!=0 || db->mallocFailed );
assert( (m.flags & MEM_Str)!=0 || db->mallocFailed );
assert( m.z || db->mallocFailed );
return m.z;
}
/*
** zIn is a UTF-16 encoded unicode string at least nChar characters long.
** Return the number of bytes in the first nChar unicode characters
** in pZ. nChar must be non-negative.
*/
int sqlite3Utf16ByteLen(const void *zIn, int nChar){
int c;
unsigned char const *z = zIn;
int n = 0;
if( SQLITE_UTF16NATIVE==SQLITE_UTF16LE ) z++;
while( n<nChar ){
c = z[0];
z += 2;
if( c>=0xd8 && c<0xdc && z[0]>=0xdc && z[0]<0xe0 ) z += 2;
n++;
}
return (int)(z-(unsigned char const *)zIn)
- (SQLITE_UTF16NATIVE==SQLITE_UTF16LE);
}
#if defined(SQLITE_TEST)
/*
** This routine is called from the TCL test function "translate_selftest".
** It checks that the primitives for serializing and deserializing
** characters in each encoding are inverses of each other.
*/
void sqlite3UtfSelfTest(void){
unsigned int i, t;
unsigned char zBuf[20];
unsigned char *z;
int n;
unsigned int c;
for(i=0; i<0x00110000; i++){
z = zBuf;
WRITE_UTF8(z, i);
n = (int)(z-zBuf);
assert( n>0 && n<=4 );
z[0] = 0;
z = zBuf;
c = sqlite3Utf8Read((const u8**)&z);
t = i;
if( i>=0xD800 && i<=0xDFFF ) t = 0xFFFD;
if( (i&0xFFFFFFFE)==0xFFFE ) t = 0xFFFD;
assert( c==t );
assert( (z-zBuf)==n );
}
}
#endif /* SQLITE_TEST */
#endif /* SQLITE_OMIT_UTF16 */
| 16,974 | 536 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_icu.shell.c | #include "third_party/sqlite3/fts3_icu.c"
| 42 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/mutex_noop.c | /*
** 2008 October 07
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the C functions that implement mutexes.
**
** This implementation in this file does not provide any mutual
** exclusion and is thus suitable for use only in applications
** that use SQLite in a single thread. The routines defined
** here are place-holders. Applications can substitute working
** mutex routines at start-time using the
**
** sqlite3_config(SQLITE_CONFIG_MUTEX,...)
**
** interface.
**
** If compiled with SQLITE_DEBUG, then additional logic is inserted
** that does error checking on mutexes to make sure they are being
** called correctly.
*/
#include "third_party/sqlite3/sqliteInt.h"
#ifndef SQLITE_MUTEX_OMIT
#ifndef SQLITE_DEBUG
/*
** Stub routines for all mutex methods.
**
** This routines provide no mutual exclusion or error checking.
*/
static int noopMutexInit(void){ return SQLITE_OK; }
static int noopMutexEnd(void){ return SQLITE_OK; }
static sqlite3_mutex *noopMutexAlloc(int id){
UNUSED_PARAMETER(id);
return (sqlite3_mutex*)8;
}
static void noopMutexFree(sqlite3_mutex *p){ UNUSED_PARAMETER(p); return; }
static void noopMutexEnter(sqlite3_mutex *p){ UNUSED_PARAMETER(p); return; }
static int noopMutexTry(sqlite3_mutex *p){
UNUSED_PARAMETER(p);
return SQLITE_OK;
}
static void noopMutexLeave(sqlite3_mutex *p){ UNUSED_PARAMETER(p); return; }
sqlite3_mutex_methods const *sqlite3NoopMutex(void){
static const sqlite3_mutex_methods sMutex = {
noopMutexInit,
noopMutexEnd,
noopMutexAlloc,
noopMutexFree,
noopMutexEnter,
noopMutexTry,
noopMutexLeave,
0,
0,
};
return &sMutex;
}
#endif /* !SQLITE_DEBUG */
#ifdef SQLITE_DEBUG
/*
** In this implementation, error checking is provided for testing
** and debugging purposes. The mutexes still do not provide any
** mutual exclusion.
*/
/*
** The mutex object
*/
typedef struct sqlite3_debug_mutex {
int id; /* The mutex type */
int cnt; /* Number of entries without a matching leave */
} sqlite3_debug_mutex;
/*
** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are
** intended for use inside assert() statements.
*/
static int debugMutexHeld(sqlite3_mutex *pX){
sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
return p==0 || p->cnt>0;
}
static int debugMutexNotheld(sqlite3_mutex *pX){
sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
return p==0 || p->cnt==0;
}
/*
** Initialize and deinitialize the mutex subsystem.
*/
static int debugMutexInit(void){ return SQLITE_OK; }
static int debugMutexEnd(void){ return SQLITE_OK; }
/*
** The sqlite3_mutex_alloc() routine allocates a new
** mutex and returns a pointer to it. If it returns NULL
** that means that a mutex could not be allocated.
*/
static sqlite3_mutex *debugMutexAlloc(int id){
static sqlite3_debug_mutex aStatic[SQLITE_MUTEX_STATIC_VFS3 - 1];
sqlite3_debug_mutex *pNew = 0;
switch( id ){
case SQLITE_MUTEX_FAST:
case SQLITE_MUTEX_RECURSIVE: {
pNew = sqlite3Malloc(sizeof(*pNew));
if( pNew ){
pNew->id = id;
pNew->cnt = 0;
}
break;
}
default: {
#ifdef SQLITE_ENABLE_API_ARMOR
if( id-2<0 || id-2>=ArraySize(aStatic) ){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
pNew = &aStatic[id-2];
pNew->id = id;
break;
}
}
return (sqlite3_mutex*)pNew;
}
/*
** This routine deallocates a previously allocated mutex.
*/
static void debugMutexFree(sqlite3_mutex *pX){
sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
assert( p->cnt==0 );
if( p->id==SQLITE_MUTEX_RECURSIVE || p->id==SQLITE_MUTEX_FAST ){
sqlite3_free(p);
}else{
#ifdef SQLITE_ENABLE_API_ARMOR
(void)SQLITE_MISUSE_BKPT;
#endif
}
}
/*
** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
** to enter a mutex. If another thread is already within the mutex,
** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return
** SQLITE_BUSY. The sqlite3_mutex_try() interface returns SQLITE_OK
** upon successful entry. Mutexes created using SQLITE_MUTEX_RECURSIVE can
** be entered multiple times by the same thread. In such cases the,
** mutex must be exited an equal number of times before another thread
** can enter. If the same thread tries to enter any other kind of mutex
** more than once, the behavior is undefined.
*/
static void debugMutexEnter(sqlite3_mutex *pX){
sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(pX) );
p->cnt++;
}
static int debugMutexTry(sqlite3_mutex *pX){
sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(pX) );
p->cnt++;
return SQLITE_OK;
}
/*
** The sqlite3_mutex_leave() routine exits a mutex that was
** previously entered by the same thread. The behavior
** is undefined if the mutex is not currently entered or
** is not currently allocated. SQLite will never do either.
*/
static void debugMutexLeave(sqlite3_mutex *pX){
sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX;
assert( debugMutexHeld(pX) );
p->cnt--;
assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(pX) );
}
sqlite3_mutex_methods const *sqlite3NoopMutex(void){
static const sqlite3_mutex_methods sMutex = {
debugMutexInit,
debugMutexEnd,
debugMutexAlloc,
debugMutexFree,
debugMutexEnter,
debugMutexTry,
debugMutexLeave,
debugMutexHeld,
debugMutexNotheld
};
return &sMutex;
}
#endif /* SQLITE_DEBUG */
/*
** If compiled with SQLITE_MUTEX_NOOP, then the no-op mutex implementation
** is used regardless of the run-time threadsafety setting.
*/
#ifdef SQLITE_MUTEX_NOOP
sqlite3_mutex_methods const *sqlite3DefaultMutex(void){
return sqlite3NoopMutex();
}
#endif /* defined(SQLITE_MUTEX_NOOP) */
#endif /* !defined(SQLITE_MUTEX_OMIT) */
| 6,195 | 216 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/util.c | /*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** Utility functions used throughout sqlite.
**
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
*/
#include "third_party/sqlite3/sqliteInt.h"
/*
** Calls to sqlite3FaultSim() are used to simulate a failure during testing,
** or to bypass normal error detection during testing in order to let
** execute proceed futher downstream.
**
** In deployment, sqlite3FaultSim() *always* return SQLITE_OK (0). The
** sqlite3FaultSim() function only returns non-zero during testing.
**
** During testing, if the test harness has set a fault-sim callback using
** a call to sqlite3_test_control(SQLITE_TESTCTRL_FAULT_INSTALL), then
** each call to sqlite3FaultSim() is relayed to that application-supplied
** callback and the integer return value form the application-supplied
** callback is returned by sqlite3FaultSim().
**
** The integer argument to sqlite3FaultSim() is a code to identify which
** sqlite3FaultSim() instance is being invoked. Each call to sqlite3FaultSim()
** should have a unique code. To prevent legacy testing applications from
** breaking, the codes should not be changed or reused.
*/
#ifndef SQLITE_UNTESTABLE
int sqlite3FaultSim(int iTest){
int (*xCallback)(int) = sqlite3GlobalConfig.xTestCallback;
return xCallback ? xCallback(iTest) : SQLITE_OK;
}
#endif
#ifndef SQLITE_OMIT_FLOATING_POINT
/*
** Return true if the floating point value is Not a Number (NaN).
**
** Use the math library isnan() function if compiled with SQLITE_HAVE_ISNAN.
** Otherwise, we have our own implementation that works on most systems.
*/
int sqlite3IsNaN(double x){
int rc; /* The value return */
#if !SQLITE_HAVE_ISNAN && !HAVE_ISNAN
u64 y;
memcpy(&y,&x,sizeof(y));
rc = IsNaN(y);
#else
rc = isnan(x);
#endif /* HAVE_ISNAN */
testcase( rc );
return rc;
}
#endif /* SQLITE_OMIT_FLOATING_POINT */
/*
** Compute a string length that is limited to what can be stored in
** lower 30 bits of a 32-bit signed integer.
**
** The value returned will never be negative. Nor will it ever be greater
** than the actual length of the string. For very long strings (greater
** than 1GiB) the value returned might be less than the true string length.
*/
int sqlite3Strlen30(const char *z){
if( z==0 ) return 0;
return 0x3fffffff & (int)strlen(z);
}
/*
** Return the declared type of a column. Or return zDflt if the column
** has no declared type.
**
** The column type is an extra string stored after the zero-terminator on
** the column name if and only if the COLFLAG_HASTYPE flag is set.
*/
char *sqlite3ColumnType(Column *pCol, char *zDflt){
if( pCol->colFlags & COLFLAG_HASTYPE ){
return pCol->zCnName + strlen(pCol->zCnName) + 1;
}else if( pCol->eCType ){
assert( pCol->eCType<=SQLITE_N_STDTYPE );
return (char*)sqlite3StdType[pCol->eCType-1];
}else{
return zDflt;
}
}
/*
** Helper function for sqlite3Error() - called rarely. Broken out into
** a separate routine to avoid unnecessary register saves on entry to
** sqlite3Error().
*/
static SQLITE_NOINLINE void sqlite3ErrorFinish(sqlite3 *db, int err_code){
if( db->pErr ) sqlite3ValueSetNull(db->pErr);
sqlite3SystemError(db, err_code);
}
/*
** Set the current error code to err_code and clear any prior error message.
** Also set iSysErrno (by calling sqlite3System) if the err_code indicates
** that would be appropriate.
*/
void sqlite3Error(sqlite3 *db, int err_code){
assert( db!=0 );
db->errCode = err_code;
if( err_code || db->pErr ){
sqlite3ErrorFinish(db, err_code);
}else{
db->errByteOffset = -1;
}
}
/*
** The equivalent of sqlite3Error(db, SQLITE_OK). Clear the error state
** and error message.
*/
void sqlite3ErrorClear(sqlite3 *db){
assert( db!=0 );
db->errCode = SQLITE_OK;
db->errByteOffset = -1;
if( db->pErr ) sqlite3ValueSetNull(db->pErr);
}
/*
** Load the sqlite3.iSysErrno field if that is an appropriate thing
** to do based on the SQLite error code in rc.
*/
void sqlite3SystemError(sqlite3 *db, int rc){
if( rc==SQLITE_IOERR_NOMEM ) return;
rc &= 0xff;
if( rc==SQLITE_CANTOPEN || rc==SQLITE_IOERR ){
db->iSysErrno = sqlite3OsGetLastError(db->pVfs);
}
}
/*
** Set the most recent error code and error string for the sqlite
** handle "db". The error code is set to "err_code".
**
** If it is not NULL, string zFormat specifies the format of the
** error string. zFormat and any string tokens that follow it are
** assumed to be encoded in UTF-8.
**
** To clear the most recent error for sqlite handle "db", sqlite3Error
** should be called with err_code set to SQLITE_OK and zFormat set
** to NULL.
*/
void sqlite3ErrorWithMsg(sqlite3 *db, int err_code, const char *zFormat, ...){
assert( db!=0 );
db->errCode = err_code;
sqlite3SystemError(db, err_code);
if( zFormat==0 ){
sqlite3Error(db, err_code);
}else if( db->pErr || (db->pErr = sqlite3ValueNew(db))!=0 ){
char *z;
va_list ap;
va_start(ap, zFormat);
z = sqlite3VMPrintf(db, zFormat, ap);
va_end(ap);
sqlite3ValueSetStr(db->pErr, -1, z, SQLITE_UTF8, SQLITE_DYNAMIC);
}
}
/*
** Add an error message to pParse->zErrMsg and increment pParse->nErr.
**
** This function should be used to report any error that occurs while
** compiling an SQL statement (i.e. within sqlite3_prepare()). The
** last thing the sqlite3_prepare() function does is copy the error
** stored by this function into the database handle using sqlite3Error().
** Functions sqlite3Error() or sqlite3ErrorWithMsg() should be used
** during statement execution (sqlite3_step() etc.).
*/
void sqlite3ErrorMsg(Parse *pParse, const char *zFormat, ...){
char *zMsg;
va_list ap;
sqlite3 *db = pParse->db;
assert( db!=0 );
assert( db->pParse==pParse || db->pParse->pToplevel==pParse );
db->errByteOffset = -2;
va_start(ap, zFormat);
zMsg = sqlite3VMPrintf(db, zFormat, ap);
va_end(ap);
if( db->errByteOffset<-1 ) db->errByteOffset = -1;
if( db->suppressErr ){
sqlite3DbFree(db, zMsg);
if( db->mallocFailed ){
pParse->nErr++;
pParse->rc = SQLITE_NOMEM;
}
}else{
pParse->nErr++;
sqlite3DbFree(db, pParse->zErrMsg);
pParse->zErrMsg = zMsg;
pParse->rc = SQLITE_ERROR;
pParse->pWith = 0;
}
}
/*
** If database connection db is currently parsing SQL, then transfer
** error code errCode to that parser if the parser has not already
** encountered some other kind of error.
*/
int sqlite3ErrorToParser(sqlite3 *db, int errCode){
Parse *pParse;
if( db==0 || (pParse = db->pParse)==0 ) return errCode;
pParse->rc = errCode;
pParse->nErr++;
return errCode;
}
/*
** Convert an SQL-style quoted string into a normal string by removing
** the quote characters. The conversion is done in-place. If the
** input does not begin with a quote character, then this routine
** is a no-op.
**
** The input string must be zero-terminated. A new zero-terminator
** is added to the dequoted string.
**
** The return value is -1 if no dequoting occurs or the length of the
** dequoted string, exclusive of the zero terminator, if dequoting does
** occur.
**
** 2002-02-14: This routine is extended to remove MS-Access style
** brackets from around identifiers. For example: "[a-b-c]" becomes
** "a-b-c".
*/
void sqlite3Dequote(char *z){
char quote;
int i, j;
if( z==0 ) return;
quote = z[0];
if( !sqlite3Isquote(quote) ) return;
if( quote=='[' ) quote = ']';
for(i=1, j=0;; i++){
assert( z[i] );
if( z[i]==quote ){
if( z[i+1]==quote ){
z[j++] = quote;
i++;
}else{
break;
}
}else{
z[j++] = z[i];
}
}
z[j] = 0;
}
void sqlite3DequoteExpr(Expr *p){
assert( !ExprHasProperty(p, EP_IntValue) );
assert( sqlite3Isquote(p->u.zToken[0]) );
p->flags |= p->u.zToken[0]=='"' ? EP_Quoted|EP_DblQuoted : EP_Quoted;
sqlite3Dequote(p->u.zToken);
}
/*
** If the input token p is quoted, try to adjust the token to remove
** the quotes. This is not always possible:
**
** "abc" -> abc
** "ab""cd" -> (not possible because of the interior "")
**
** Remove the quotes if possible. This is a optimization. The overall
** system should still return the correct answer even if this routine
** is always a no-op.
*/
void sqlite3DequoteToken(Token *p){
unsigned int i;
if( p->n<2 ) return;
if( !sqlite3Isquote(p->z[0]) ) return;
for(i=1; i<p->n-1; i++){
if( sqlite3Isquote(p->z[i]) ) return;
}
p->n -= 2;
p->z++;
}
/*
** Generate a Token object from a string
*/
void sqlite3TokenInit(Token *p, char *z){
p->z = z;
p->n = sqlite3Strlen30(z);
}
/* Convenient short-hand */
#define UpperToLower sqlite3UpperToLower
/*
** Some systems have stricmp(). Others have strcasecmp(). Because
** there is no consistency, we will define our own.
**
** IMPLEMENTATION-OF: R-30243-02494 The sqlite3_stricmp() and
** sqlite3_strnicmp() APIs allow applications and extensions to compare
** the contents of two buffers containing UTF-8 strings in a
** case-independent fashion, using the same definition of "case
** independence" that SQLite uses internally when comparing identifiers.
*/
int sqlite3_stricmp(const char *zLeft, const char *zRight){
if( zLeft==0 ){
return zRight ? -1 : 0;
}else if( zRight==0 ){
return 1;
}
return sqlite3StrICmp(zLeft, zRight);
}
int sqlite3StrICmp(const char *zLeft, const char *zRight){
unsigned char *a, *b;
int c, x;
a = (unsigned char *)zLeft;
b = (unsigned char *)zRight;
for(;;){
c = *a;
x = *b;
if( c==x ){
if( c==0 ) break;
}else{
c = (int)UpperToLower[c] - (int)UpperToLower[x];
if( c ) break;
}
a++;
b++;
}
return c;
}
int sqlite3_strnicmp(const char *zLeft, const char *zRight, int N){
register unsigned char *a, *b;
if( zLeft==0 ){
return zRight ? -1 : 0;
}else if( zRight==0 ){
return 1;
}
a = (unsigned char *)zLeft;
b = (unsigned char *)zRight;
while( N-- > 0 && *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; }
return N<0 ? 0 : UpperToLower[*a] - UpperToLower[*b];
}
/*
** Compute an 8-bit hash on a string that is insensitive to case differences
*/
u8 sqlite3StrIHash(const char *z){
u8 h = 0;
if( z==0 ) return 0;
while( z[0] ){
h += UpperToLower[(unsigned char)z[0]];
z++;
}
return h;
}
/*
** Compute 10 to the E-th power. Examples: E==1 results in 10.
** E==2 results in 100. E==50 results in 1.0e50.
**
** This routine only works for values of E between 1 and 341.
*/
static LONGDOUBLE_TYPE sqlite3Pow10(int E){
#if defined(_MSC_VER)
static const LONGDOUBLE_TYPE x[] = {
1.0e+001L,
1.0e+002L,
1.0e+004L,
1.0e+008L,
1.0e+016L,
1.0e+032L,
1.0e+064L,
1.0e+128L,
1.0e+256L
};
LONGDOUBLE_TYPE r = 1.0;
int i;
assert( E>=0 && E<=307 );
for(i=0; E!=0; i++, E >>=1){
if( E & 1 ) r *= x[i];
}
return r;
#else
LONGDOUBLE_TYPE x = 10.0;
LONGDOUBLE_TYPE r = 1.0;
while(1){
if( E & 1 ) r *= x;
E >>= 1;
if( E==0 ) break;
x *= x;
}
return r;
#endif
}
/*
** The string z[] is an text representation of a real number.
** Convert this string to a double and write it into *pResult.
**
** The string z[] is length bytes in length (bytes, not characters) and
** uses the encoding enc. The string is not necessarily zero-terminated.
**
** Return TRUE if the result is a valid real number (or integer) and FALSE
** if the string is empty or contains extraneous text. More specifically
** return
** 1 => The input string is a pure integer
** 2 or more => The input has a decimal point or eNNN clause
** 0 or less => The input string is not a valid number
** -1 => Not a valid number, but has a valid prefix which
** includes a decimal point and/or an eNNN clause
**
** Valid numbers are in one of these formats:
**
** [+-]digits[E[+-]digits]
** [+-]digits.[digits][E[+-]digits]
** [+-].digits[E[+-]digits]
**
** Leading and trailing whitespace is ignored for the purpose of determining
** validity.
**
** If some prefix of the input string is a valid number, this routine
** returns FALSE but it still converts the prefix and writes the result
** into *pResult.
*/
#if defined(_MSC_VER)
#pragma warning(disable : 4756)
#endif
int sqlite3AtoF(const char *z, double *pResult, int length, u8 enc){
#ifndef SQLITE_OMIT_FLOATING_POINT
int incr;
const char *zEnd;
/* sign * significand * (10 ^ (esign * exponent)) */
int sign = 1; /* sign of significand */
i64 s = 0; /* significand */
int d = 0; /* adjust exponent for shifting decimal point */
int esign = 1; /* sign of exponent */
int e = 0; /* exponent */
int eValid = 1; /* True exponent is either not used or is well-formed */
double result;
int nDigit = 0; /* Number of digits processed */
int eType = 1; /* 1: pure integer, 2+: fractional -1 or less: bad UTF16 */
assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
*pResult = 0.0; /* Default return value, in case of an error */
if( length==0 ) return 0;
if( enc==SQLITE_UTF8 ){
incr = 1;
zEnd = z + length;
}else{
int i;
incr = 2;
length &= ~1;
assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
testcase( enc==SQLITE_UTF16LE );
testcase( enc==SQLITE_UTF16BE );
for(i=3-enc; i<length && z[i]==0; i+=2){}
if( i<length ) eType = -100;
zEnd = &z[i^1];
z += (enc&1);
}
/* skip leading spaces */
while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;
if( z>=zEnd ) return 0;
/* get sign of significand */
if( *z=='-' ){
sign = -1;
z+=incr;
}else if( *z=='+' ){
z+=incr;
}
/* copy max significant digits to significand */
while( z<zEnd && sqlite3Isdigit(*z) ){
s = s*10 + (*z - '0');
z+=incr; nDigit++;
if( s>=((LARGEST_INT64-9)/10) ){
/* skip non-significant significand digits
** (increase exponent by d to shift decimal left) */
while( z<zEnd && sqlite3Isdigit(*z) ){ z+=incr; d++; }
}
}
if( z>=zEnd ) goto do_atof_calc;
/* if decimal point is present */
if( *z=='.' ){
z+=incr;
eType++;
/* copy digits from after decimal to significand
** (decrease exponent by d to shift decimal right) */
while( z<zEnd && sqlite3Isdigit(*z) ){
if( s<((LARGEST_INT64-9)/10) ){
s = s*10 + (*z - '0');
d--;
nDigit++;
}
z+=incr;
}
}
if( z>=zEnd ) goto do_atof_calc;
/* if exponent is present */
if( *z=='e' || *z=='E' ){
z+=incr;
eValid = 0;
eType++;
/* This branch is needed to avoid a (harmless) buffer overread. The
** special comment alerts the mutation tester that the correct answer
** is obtained even if the branch is omitted */
if( z>=zEnd ) goto do_atof_calc; /*PREVENTS-HARMLESS-OVERREAD*/
/* get sign of exponent */
if( *z=='-' ){
esign = -1;
z+=incr;
}else if( *z=='+' ){
z+=incr;
}
/* copy digits to exponent */
while( z<zEnd && sqlite3Isdigit(*z) ){
e = e<10000 ? (e*10 + (*z - '0')) : 10000;
z+=incr;
eValid = 1;
}
}
/* skip trailing spaces */
while( z<zEnd && sqlite3Isspace(*z) ) z+=incr;
do_atof_calc:
/* adjust exponent by d, and update sign */
e = (e*esign) + d;
if( e<0 ) {
esign = -1;
e *= -1;
} else {
esign = 1;
}
if( s==0 ) {
/* In the IEEE 754 standard, zero is signed. */
result = sign<0 ? -(double)0 : (double)0;
} else {
/* Attempt to reduce exponent.
**
** Branches that are not required for the correct answer but which only
** help to obtain the correct answer faster are marked with special
** comments, as a hint to the mutation tester.
*/
while( e>0 ){ /*OPTIMIZATION-IF-TRUE*/
if( esign>0 ){
if( s>=(LARGEST_INT64/10) ) break; /*OPTIMIZATION-IF-FALSE*/
s *= 10;
}else{
if( s%10!=0 ) break; /*OPTIMIZATION-IF-FALSE*/
s /= 10;
}
e--;
}
/* adjust the sign of significand */
s = sign<0 ? -s : s;
if( e==0 ){ /*OPTIMIZATION-IF-TRUE*/
result = (double)s;
}else{
/* attempt to handle extremely small/large numbers better */
if( e>307 ){ /*OPTIMIZATION-IF-TRUE*/
if( e<342 ){ /*OPTIMIZATION-IF-TRUE*/
LONGDOUBLE_TYPE scale = sqlite3Pow10(e-308);
if( esign<0 ){
result = s / scale;
result /= 1.0e+308;
}else{
result = s * scale;
result *= 1.0e+308;
}
}else{ assert( e>=342 );
if( esign<0 ){
result = 0.0*s;
}else{
#ifdef INFINITY
result = INFINITY*s;
#else
result = 1e308*1e308*s; /* Infinity */
#endif
}
}
}else{
LONGDOUBLE_TYPE scale = sqlite3Pow10(e);
if( esign<0 ){
result = s / scale;
}else{
result = s * scale;
}
}
}
}
/* store the result */
*pResult = result;
/* return true if number and no extra non-whitespace chracters after */
if( z==zEnd && nDigit>0 && eValid && eType>0 ){
return eType;
}else if( eType>=2 && (eType==3 || eValid) && nDigit>0 ){
return -1;
}else{
return 0;
}
#else
return !sqlite3Atoi64(z, pResult, length, enc);
#endif /* SQLITE_OMIT_FLOATING_POINT */
}
#if defined(_MSC_VER)
#pragma warning(default : 4756)
#endif
/*
** Render an signed 64-bit integer as text. Store the result in zOut[].
**
** The caller must ensure that zOut[] is at least 21 bytes in size.
*/
void sqlite3Int64ToText(i64 v, char *zOut){
int i;
u64 x;
char zTemp[22];
if( v<0 ){
x = (v==SMALLEST_INT64) ? ((u64)1)<<63 : (u64)-v;
}else{
x = v;
}
i = sizeof(zTemp)-2;
zTemp[sizeof(zTemp)-1] = 0;
do{
zTemp[i--] = (x%10) + '0';
x = x/10;
}while( x );
if( v<0 ) zTemp[i--] = '-';
memcpy(zOut, &zTemp[i+1], sizeof(zTemp)-1-i);
}
/*
** Compare the 19-character string zNum against the text representation
** value 2^63: 9223372036854775808. Return negative, zero, or positive
** if zNum is less than, equal to, or greater than the string.
** Note that zNum must contain exactly 19 characters.
**
** Unlike memcmp() this routine is guaranteed to return the difference
** in the values of the last digit if the only difference is in the
** last digit. So, for example,
**
** compare2pow63("9223372036854775800", 1)
**
** will return -8.
*/
static int compare2pow63(const char *zNum, int incr){
int c = 0;
int i;
/* 012345678901234567 */
const char *pow63 = "922337203685477580";
for(i=0; c==0 && i<18; i++){
c = (zNum[i*incr]-pow63[i])*10;
}
if( c==0 ){
c = zNum[18*incr] - '8';
testcase( c==(-1) );
testcase( c==0 );
testcase( c==(+1) );
}
return c;
}
/*
** Convert zNum to a 64-bit signed integer. zNum must be decimal. This
** routine does *not* accept hexadecimal notation.
**
** Returns:
**
** -1 Not even a prefix of the input text looks like an integer
** 0 Successful transformation. Fits in a 64-bit signed integer.
** 1 Excess non-space text after the integer value
** 2 Integer too large for a 64-bit signed integer or is malformed
** 3 Special case of 9223372036854775808
**
** length is the number of bytes in the string (bytes, not characters).
** The string is not necessarily zero-terminated. The encoding is
** given by enc.
*/
int sqlite3Atoi64(const char *zNum, i64 *pNum, int length, u8 enc){
int incr;
u64 u = 0;
int neg = 0; /* assume positive */
int i;
int c = 0;
int nonNum = 0; /* True if input contains UTF16 with high byte non-zero */
int rc; /* Baseline return code */
const char *zStart;
const char *zEnd = zNum + length;
assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
if( enc==SQLITE_UTF8 ){
incr = 1;
}else{
incr = 2;
length &= ~1;
assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 );
for(i=3-enc; i<length && zNum[i]==0; i+=2){}
nonNum = i<length;
zEnd = &zNum[i^1];
zNum += (enc&1);
}
while( zNum<zEnd && sqlite3Isspace(*zNum) ) zNum+=incr;
if( zNum<zEnd ){
if( *zNum=='-' ){
neg = 1;
zNum+=incr;
}else if( *zNum=='+' ){
zNum+=incr;
}
}
zStart = zNum;
while( zNum<zEnd && zNum[0]=='0' ){ zNum+=incr; } /* Skip leading zeros. */
for(i=0; &zNum[i]<zEnd && (c=zNum[i])>='0' && c<='9'; i+=incr){
u = u*10 + c - '0';
}
testcase( i==18*incr );
testcase( i==19*incr );
testcase( i==20*incr );
if( u>LARGEST_INT64 ){
/* This test and assignment is needed only to suppress UB warnings
** from clang and -fsanitize=undefined. This test and assignment make
** the code a little larger and slower, and no harm comes from omitting
** them, but we must appaise the undefined-behavior pharisees. */
*pNum = neg ? SMALLEST_INT64 : LARGEST_INT64;
}else if( neg ){
*pNum = -(i64)u;
}else{
*pNum = (i64)u;
}
rc = 0;
if( i==0 && zStart==zNum ){ /* No digits */
rc = -1;
}else if( nonNum ){ /* UTF16 with high-order bytes non-zero */
rc = 1;
}else if( &zNum[i]<zEnd ){ /* Extra bytes at the end */
int jj = i;
do{
if( !sqlite3Isspace(zNum[jj]) ){
rc = 1; /* Extra non-space text after the integer */
break;
}
jj += incr;
}while( &zNum[jj]<zEnd );
}
if( i<19*incr ){
/* Less than 19 digits, so we know that it fits in 64 bits */
assert( u<=LARGEST_INT64 );
return rc;
}else{
/* zNum is a 19-digit numbers. Compare it against 9223372036854775808. */
c = i>19*incr ? 1 : compare2pow63(zNum, incr);
if( c<0 ){
/* zNum is less than 9223372036854775808 so it fits */
assert( u<=LARGEST_INT64 );
return rc;
}else{
*pNum = neg ? SMALLEST_INT64 : LARGEST_INT64;
if( c>0 ){
/* zNum is greater than 9223372036854775808 so it overflows */
return 2;
}else{
/* zNum is exactly 9223372036854775808. Fits if negative. The
** special case 2 overflow if positive */
assert( u-1==LARGEST_INT64 );
return neg ? rc : 3;
}
}
}
}
/*
** Transform a UTF-8 integer literal, in either decimal or hexadecimal,
** into a 64-bit signed integer. This routine accepts hexadecimal literals,
** whereas sqlite3Atoi64() does not.
**
** Returns:
**
** 0 Successful transformation. Fits in a 64-bit signed integer.
** 1 Excess text after the integer value
** 2 Integer too large for a 64-bit signed integer or is malformed
** 3 Special case of 9223372036854775808
*/
int sqlite3DecOrHexToI64(const char *z, i64 *pOut){
#ifndef SQLITE_OMIT_HEX_INTEGER
if( z[0]=='0'
&& (z[1]=='x' || z[1]=='X')
){
u64 u = 0;
int i, k;
for(i=2; z[i]=='0'; i++){}
for(k=i; sqlite3Isxdigit(z[k]); k++){
u = u*16 + sqlite3HexToInt(z[k]);
}
memcpy(pOut, &u, 8);
return (z[k]==0 && k-i<=16) ? 0 : 2;
}else
#endif /* SQLITE_OMIT_HEX_INTEGER */
{
return sqlite3Atoi64(z, pOut, sqlite3Strlen30(z), SQLITE_UTF8);
}
}
/*
** If zNum represents an integer that will fit in 32-bits, then set
** *pValue to that integer and return true. Otherwise return false.
**
** This routine accepts both decimal and hexadecimal notation for integers.
**
** Any non-numeric characters that following zNum are ignored.
** This is different from sqlite3Atoi64() which requires the
** input number to be zero-terminated.
*/
int sqlite3GetInt32(const char *zNum, int *pValue){
sqlite_int64 v = 0;
int i, c;
int neg = 0;
if( zNum[0]=='-' ){
neg = 1;
zNum++;
}else if( zNum[0]=='+' ){
zNum++;
}
#ifndef SQLITE_OMIT_HEX_INTEGER
else if( zNum[0]=='0'
&& (zNum[1]=='x' || zNum[1]=='X')
&& sqlite3Isxdigit(zNum[2])
){
u32 u = 0;
zNum += 2;
while( zNum[0]=='0' ) zNum++;
for(i=0; sqlite3Isxdigit(zNum[i]) && i<8; i++){
u = u*16 + sqlite3HexToInt(zNum[i]);
}
if( (u&0x80000000)==0 && sqlite3Isxdigit(zNum[i])==0 ){
memcpy(pValue, &u, 4);
return 1;
}else{
return 0;
}
}
#endif
if( !sqlite3Isdigit(zNum[0]) ) return 0;
while( zNum[0]=='0' ) zNum++;
for(i=0; i<11 && (c = zNum[i] - '0')>=0 && c<=9; i++){
v = v*10 + c;
}
/* The longest decimal representation of a 32 bit integer is 10 digits:
**
** 1234567890
** 2^31 -> 2147483648
*/
testcase( i==10 );
if( i>10 ){
return 0;
}
testcase( v-neg==2147483647 );
if( v-neg>2147483647 ){
return 0;
}
if( neg ){
v = -v;
}
*pValue = (int)v;
return 1;
}
/*
** Return a 32-bit integer value extracted from a string. If the
** string is not an integer, just return 0.
*/
int sqlite3Atoi(const char *z){
int x = 0;
sqlite3GetInt32(z, &x);
return x;
}
/*
** Try to convert z into an unsigned 32-bit integer. Return true on
** success and false if there is an error.
**
** Only decimal notation is accepted.
*/
int sqlite3GetUInt32(const char *z, u32 *pI){
u64 v = 0;
int i;
for(i=0; sqlite3Isdigit(z[i]); i++){
v = v*10 + z[i] - '0';
if( v>4294967296LL ){ *pI = 0; return 0; }
}
if( i==0 || z[i]!=0 ){ *pI = 0; return 0; }
*pI = (u32)v;
return 1;
}
/*
** The variable-length integer encoding is as follows:
**
** KEY:
** A = 0xxxxxxx 7 bits of data and one flag bit
** B = 1xxxxxxx 7 bits of data and one flag bit
** C = xxxxxxxx 8 bits of data
**
** 7 bits - A
** 14 bits - BA
** 21 bits - BBA
** 28 bits - BBBA
** 35 bits - BBBBA
** 42 bits - BBBBBA
** 49 bits - BBBBBBA
** 56 bits - BBBBBBBA
** 64 bits - BBBBBBBBC
*/
/*
** Write a 64-bit variable-length integer to memory starting at p[0].
** The length of data write will be between 1 and 9 bytes. The number
** of bytes written is returned.
**
** A variable-length integer consists of the lower 7 bits of each byte
** for all bytes that have the 8th bit set and one byte with the 8th
** bit clear. Except, if we get to the 9th byte, it stores the full
** 8 bits and is the last byte.
*/
static int SQLITE_NOINLINE putVarint64(unsigned char *p, u64 v){
int i, j, n;
u8 buf[10];
if( v & (((u64)0xff000000)<<32) ){
p[8] = (u8)v;
v >>= 8;
for(i=7; i>=0; i--){
p[i] = (u8)((v & 0x7f) | 0x80);
v >>= 7;
}
return 9;
}
n = 0;
do{
buf[n++] = (u8)((v & 0x7f) | 0x80);
v >>= 7;
}while( v!=0 );
buf[0] &= 0x7f;
assert( n<=9 );
for(i=0, j=n-1; j>=0; j--, i++){
p[i] = buf[j];
}
return n;
}
int sqlite3PutVarint(unsigned char *p, u64 v){
if( v<=0x7f ){
p[0] = v&0x7f;
return 1;
}
if( v<=0x3fff ){
p[0] = ((v>>7)&0x7f)|0x80;
p[1] = v&0x7f;
return 2;
}
return putVarint64(p,v);
}
/*
** Bitmasks used by sqlite3GetVarint(). These precomputed constants
** are defined here rather than simply putting the constant expressions
** inline in order to work around bugs in the RVT compiler.
**
** SLOT_2_0 A mask for (0x7f<<14) | 0x7f
**
** SLOT_4_2_0 A mask for (0x7f<<28) | SLOT_2_0
*/
#define SLOT_2_0 0x001fc07f
#define SLOT_4_2_0 0xf01fc07f
/*
** Read a 64-bit variable-length integer from memory starting at p[0].
** Return the number of bytes read. The value is stored in *v.
*/
u8 sqlite3GetVarint(const unsigned char *p, u64 *v){
u32 a,b,s;
if( ((signed char*)p)[0]>=0 ){
*v = *p;
return 1;
}
if( ((signed char*)p)[1]>=0 ){
*v = ((u32)(p[0]&0x7f)<<7) | p[1];
return 2;
}
/* Verify that constants are precomputed correctly */
assert( SLOT_2_0 == ((0x7f<<14) | (0x7f)) );
assert( SLOT_4_2_0 == ((0xfU<<28) | (0x7f<<14) | (0x7f)) );
a = ((u32)p[0])<<14;
b = p[1];
p += 2;
a |= *p;
/* a: p0<<14 | p2 (unmasked) */
if (!(a&0x80))
{
a &= SLOT_2_0;
b &= 0x7f;
b = b<<7;
a |= b;
*v = a;
return 3;
}
/* CSE1 from below */
a &= SLOT_2_0;
p++;
b = b<<14;
b |= *p;
/* b: p1<<14 | p3 (unmasked) */
if (!(b&0x80))
{
b &= SLOT_2_0;
/* moved CSE1 up */
/* a &= (0x7f<<14)|(0x7f); */
a = a<<7;
a |= b;
*v = a;
return 4;
}
/* a: p0<<14 | p2 (masked) */
/* b: p1<<14 | p3 (unmasked) */
/* 1:save off p0<<21 | p1<<14 | p2<<7 | p3 (masked) */
/* moved CSE1 up */
/* a &= (0x7f<<14)|(0x7f); */
b &= SLOT_2_0;
s = a;
/* s: p0<<14 | p2 (masked) */
p++;
a = a<<14;
a |= *p;
/* a: p0<<28 | p2<<14 | p4 (unmasked) */
if (!(a&0x80))
{
/* we can skip these cause they were (effectively) done above
** while calculating s */
/* a &= (0x7f<<28)|(0x7f<<14)|(0x7f); */
/* b &= (0x7f<<14)|(0x7f); */
b = b<<7;
a |= b;
s = s>>18;
*v = ((u64)s)<<32 | a;
return 5;
}
/* 2:save off p0<<21 | p1<<14 | p2<<7 | p3 (masked) */
s = s<<7;
s |= b;
/* s: p0<<21 | p1<<14 | p2<<7 | p3 (masked) */
p++;
b = b<<14;
b |= *p;
/* b: p1<<28 | p3<<14 | p5 (unmasked) */
if (!(b&0x80))
{
/* we can skip this cause it was (effectively) done above in calc'ing s */
/* b &= (0x7f<<28)|(0x7f<<14)|(0x7f); */
a &= SLOT_2_0;
a = a<<7;
a |= b;
s = s>>18;
*v = ((u64)s)<<32 | a;
return 6;
}
p++;
a = a<<14;
a |= *p;
/* a: p2<<28 | p4<<14 | p6 (unmasked) */
if (!(a&0x80))
{
a &= SLOT_4_2_0;
b &= SLOT_2_0;
b = b<<7;
a |= b;
s = s>>11;
*v = ((u64)s)<<32 | a;
return 7;
}
/* CSE2 from below */
a &= SLOT_2_0;
p++;
b = b<<14;
b |= *p;
/* b: p3<<28 | p5<<14 | p7 (unmasked) */
if (!(b&0x80))
{
b &= SLOT_4_2_0;
/* moved CSE2 up */
/* a &= (0x7f<<14)|(0x7f); */
a = a<<7;
a |= b;
s = s>>4;
*v = ((u64)s)<<32 | a;
return 8;
}
p++;
a = a<<15;
a |= *p;
/* a: p4<<29 | p6<<15 | p8 (unmasked) */
/* moved CSE2 up */
/* a &= (0x7f<<29)|(0x7f<<15)|(0xff); */
b &= SLOT_2_0;
b = b<<8;
a |= b;
s = s<<4;
b = p[-4];
b &= 0x7f;
b = b>>3;
s |= b;
*v = ((u64)s)<<32 | a;
return 9;
}
/*
** Read a 32-bit variable-length integer from memory starting at p[0].
** Return the number of bytes read. The value is stored in *v.
**
** If the varint stored in p[0] is larger than can fit in a 32-bit unsigned
** integer, then set *v to 0xffffffff.
**
** A MACRO version, getVarint32, is provided which inlines the
** single-byte case. All code should use the MACRO version as
** this function assumes the single-byte case has already been handled.
*/
u8 sqlite3GetVarint32(const unsigned char *p, u32 *v){
u32 a,b;
/* The 1-byte case. Overwhelmingly the most common. Handled inline
** by the getVarin32() macro */
a = *p;
/* a: p0 (unmasked) */
#ifndef getVarint32
if (!(a&0x80))
{
/* Values between 0 and 127 */
*v = a;
return 1;
}
#endif
/* The 2-byte case */
p++;
b = *p;
/* b: p1 (unmasked) */
if (!(b&0x80))
{
/* Values between 128 and 16383 */
a &= 0x7f;
a = a<<7;
*v = a | b;
return 2;
}
/* The 3-byte case */
p++;
a = a<<14;
a |= *p;
/* a: p0<<14 | p2 (unmasked) */
if (!(a&0x80))
{
/* Values between 16384 and 2097151 */
a &= (0x7f<<14)|(0x7f);
b &= 0x7f;
b = b<<7;
*v = a | b;
return 3;
}
/* A 32-bit varint is used to store size information in btrees.
** Objects are rarely larger than 2MiB limit of a 3-byte varint.
** A 3-byte varint is sufficient, for example, to record the size
** of a 1048569-byte BLOB or string.
**
** We only unroll the first 1-, 2-, and 3- byte cases. The very
** rare larger cases can be handled by the slower 64-bit varint
** routine.
*/
#if 1
{
u64 v64;
u8 n;
n = sqlite3GetVarint(p-2, &v64);
assert( n>3 && n<=9 );
if( (v64 & SQLITE_MAX_U32)!=v64 ){
*v = 0xffffffff;
}else{
*v = (u32)v64;
}
return n;
}
#else
/* For following code (kept for historical record only) shows an
** unrolling for the 3- and 4-byte varint cases. This code is
** slightly faster, but it is also larger and much harder to test.
*/
p++;
b = b<<14;
b |= *p;
/* b: p1<<14 | p3 (unmasked) */
if (!(b&0x80))
{
/* Values between 2097152 and 268435455 */
b &= (0x7f<<14)|(0x7f);
a &= (0x7f<<14)|(0x7f);
a = a<<7;
*v = a | b;
return 4;
}
p++;
a = a<<14;
a |= *p;
/* a: p0<<28 | p2<<14 | p4 (unmasked) */
if (!(a&0x80))
{
/* Values between 268435456 and 34359738367 */
a &= SLOT_4_2_0;
b &= SLOT_4_2_0;
b = b<<7;
*v = a | b;
return 5;
}
/* We can only reach this point when reading a corrupt database
** file. In that case we are not in any hurry. Use the (relatively
** slow) general-purpose sqlite3GetVarint() routine to extract the
** value. */
{
u64 v64;
u8 n;
p -= 4;
n = sqlite3GetVarint(p, &v64);
assert( n>5 && n<=9 );
*v = (u32)v64;
return n;
}
#endif
}
/*
** Return the number of bytes that will be needed to store the given
** 64-bit integer.
*/
int sqlite3VarintLen(u64 v){
int i;
for(i=1; (v >>= 7)!=0; i++){ assert( i<10 ); }
return i;
}
/*
** Read or write a four-byte big-endian integer value.
*/
u32 sqlite3Get4byte(const u8 *p){
#if SQLITE_BYTEORDER==4321
u32 x;
memcpy(&x,p,4);
return x;
#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
u32 x;
memcpy(&x,p,4);
return __builtin_bswap32(x);
#elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
u32 x;
memcpy(&x,p,4);
return _byteswap_ulong(x);
#else
testcase( p[0]&0x80 );
return ((unsigned)p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
#endif
}
void sqlite3Put4byte(unsigned char *p, u32 v){
#if SQLITE_BYTEORDER==4321
memcpy(p,&v,4);
#elif SQLITE_BYTEORDER==1234 && GCC_VERSION>=4003000
u32 x = __builtin_bswap32(v);
memcpy(p,&x,4);
#elif SQLITE_BYTEORDER==1234 && MSVC_VERSION>=1300
u32 x = _byteswap_ulong(v);
memcpy(p,&x,4);
#else
p[0] = (u8)(v>>24);
p[1] = (u8)(v>>16);
p[2] = (u8)(v>>8);
p[3] = (u8)v;
#endif
}
/*
** Translate a single byte of Hex into an integer.
** This routine only works if h really is a valid hexadecimal
** character: 0..9a..fA..F
*/
u8 sqlite3HexToInt(int h){
assert( (h>='0' && h<='9') || (h>='a' && h<='f') || (h>='A' && h<='F') );
#ifdef SQLITE_ASCII
h += 9*(1&(h>>6));
#endif
#ifdef SQLITE_EBCDIC
h += 9*(1&~(h>>4));
#endif
return (u8)(h & 0xf);
}
#if !defined(SQLITE_OMIT_BLOB_LITERAL)
/*
** Convert a BLOB literal of the form "x'hhhhhh'" into its binary
** value. Return a pointer to its binary value. Space to hold the
** binary value has been obtained from malloc and must be freed by
** the calling routine.
*/
void *sqlite3HexToBlob(sqlite3 *db, const char *z, int n){
char *zBlob;
int i;
zBlob = (char *)sqlite3DbMallocRawNN(db, n/2 + 1);
n--;
if( zBlob ){
for(i=0; i<n; i+=2){
zBlob[i/2] = (sqlite3HexToInt(z[i])<<4) | sqlite3HexToInt(z[i+1]);
}
zBlob[i/2] = 0;
}
return zBlob;
}
#endif /* !SQLITE_OMIT_BLOB_LITERAL */
/*
** Log an error that is an API call on a connection pointer that should
** not have been used. The "type" of connection pointer is given as the
** argument. The zType is a word like "NULL" or "closed" or "invalid".
*/
static void logBadConnection(const char *zType){
sqlite3_log(SQLITE_MISUSE,
"API call with %s database connection pointer",
zType
);
}
/*
** Check to make sure we have a valid db pointer. This test is not
** foolproof but it does provide some measure of protection against
** misuse of the interface such as passing in db pointers that are
** NULL or which have been previously closed. If this routine returns
** 1 it means that the db pointer is valid and 0 if it should not be
** dereferenced for any reason. The calling function should invoke
** SQLITE_MISUSE immediately.
**
** sqlite3SafetyCheckOk() requires that the db pointer be valid for
** use. sqlite3SafetyCheckSickOrOk() allows a db pointer that failed to
** open properly and is not fit for general use but which can be
** used as an argument to sqlite3_errmsg() or sqlite3_close().
*/
int sqlite3SafetyCheckOk(sqlite3 *db){
u8 eOpenState;
if( db==0 ){
logBadConnection("NULL");
return 0;
}
eOpenState = db->eOpenState;
if( eOpenState!=SQLITE_STATE_OPEN ){
if( sqlite3SafetyCheckSickOrOk(db) ){
testcase( sqlite3GlobalConfig.xLog!=0 );
logBadConnection("unopened");
}
return 0;
}else{
return 1;
}
}
int sqlite3SafetyCheckSickOrOk(sqlite3 *db){
u8 eOpenState;
eOpenState = db->eOpenState;
if( eOpenState!=SQLITE_STATE_SICK &&
eOpenState!=SQLITE_STATE_OPEN &&
eOpenState!=SQLITE_STATE_BUSY ){
testcase( sqlite3GlobalConfig.xLog!=0 );
logBadConnection("invalid");
return 0;
}else{
return 1;
}
}
/*
** Attempt to add, substract, or multiply the 64-bit signed value iB against
** the other 64-bit signed integer at *pA and store the result in *pA.
** Return 0 on success. Or if the operation would have resulted in an
** overflow, leave *pA unchanged and return 1.
*/
int sqlite3AddInt64(i64 *pA, i64 iB){
#if GCC_VERSION>=5004000 && !defined(__INTEL_COMPILER)
return __builtin_add_overflow(*pA, iB, pA);
#else
i64 iA = *pA;
testcase( iA==0 ); testcase( iA==1 );
testcase( iB==-1 ); testcase( iB==0 );
if( iB>=0 ){
testcase( iA>0 && LARGEST_INT64 - iA == iB );
testcase( iA>0 && LARGEST_INT64 - iA == iB - 1 );
if( iA>0 && LARGEST_INT64 - iA < iB ) return 1;
}else{
testcase( iA<0 && -(iA + LARGEST_INT64) == iB + 1 );
testcase( iA<0 && -(iA + LARGEST_INT64) == iB + 2 );
if( iA<0 && -(iA + LARGEST_INT64) > iB + 1 ) return 1;
}
*pA += iB;
return 0;
#endif
}
int sqlite3SubInt64(i64 *pA, i64 iB){
#if GCC_VERSION>=5004000 && !defined(__INTEL_COMPILER)
return __builtin_sub_overflow(*pA, iB, pA);
#else
testcase( iB==SMALLEST_INT64+1 );
if( iB==SMALLEST_INT64 ){
testcase( (*pA)==(-1) ); testcase( (*pA)==0 );
if( (*pA)>=0 ) return 1;
*pA -= iB;
return 0;
}else{
return sqlite3AddInt64(pA, -iB);
}
#endif
}
int sqlite3MulInt64(i64 *pA, i64 iB){
#if GCC_VERSION>=5004000 && !defined(__INTEL_COMPILER)
return __builtin_mul_overflow(*pA, iB, pA);
#else
i64 iA = *pA;
if( iB>0 ){
if( iA>LARGEST_INT64/iB ) return 1;
if( iA<SMALLEST_INT64/iB ) return 1;
}else if( iB<0 ){
if( iA>0 ){
if( iB<SMALLEST_INT64/iA ) return 1;
}else if( iA<0 ){
if( iB==SMALLEST_INT64 ) return 1;
if( iA==SMALLEST_INT64 ) return 1;
if( -iA>LARGEST_INT64/-iB ) return 1;
}
}
*pA = iA*iB;
return 0;
#endif
}
/*
** Compute the absolute value of a 32-bit signed integer, of possible. Or
** if the integer has a value of -2147483648, return +2147483647
*/
int sqlite3AbsInt32(int x){
if( x>=0 ) return x;
if( x==(int)0x80000000 ) return 0x7fffffff;
return -x;
}
#ifdef SQLITE_ENABLE_8_3_NAMES
/*
** If SQLITE_ENABLE_8_3_NAMES is set at compile-time and if the database
** filename in zBaseFilename is a URI with the "8_3_names=1" parameter and
** if filename in z[] has a suffix (a.k.a. "extension") that is longer than
** three characters, then shorten the suffix on z[] to be the last three
** characters of the original suffix.
**
** If SQLITE_ENABLE_8_3_NAMES is set to 2 at compile-time, then always
** do the suffix shortening regardless of URI parameter.
**
** Examples:
**
** test.db-journal => test.nal
** test.db-wal => test.wal
** test.db-shm => test.shm
** test.db-mj7f3319fa => test.9fa
*/
void sqlite3FileSuffix3(const char *zBaseFilename, char *z){
#if SQLITE_ENABLE_8_3_NAMES<2
if( sqlite3_uri_boolean(zBaseFilename, "8_3_names", 0) )
#endif
{
int i, sz;
sz = sqlite3Strlen30(z);
for(i=sz-1; i>0 && z[i]!='/' && z[i]!='.'; i--){}
if( z[i]=='.' && ALWAYS(sz>i+4) ) memmove(&z[i+1], &z[sz-3], 4);
}
}
#endif
/*
** Find (an approximate) sum of two LogEst values. This computation is
** not a simple "+" operator because LogEst is stored as a logarithmic
** value.
**
*/
LogEst sqlite3LogEstAdd(LogEst a, LogEst b){
static const unsigned char x[] = {
10, 10, /* 0,1 */
9, 9, /* 2,3 */
8, 8, /* 4,5 */
7, 7, 7, /* 6,7,8 */
6, 6, 6, /* 9,10,11 */
5, 5, 5, /* 12-14 */
4, 4, 4, 4, /* 15-18 */
3, 3, 3, 3, 3, 3, /* 19-24 */
2, 2, 2, 2, 2, 2, 2, /* 25-31 */
};
if( a>=b ){
if( a>b+49 ) return a;
if( a>b+31 ) return a+1;
return a+x[a-b];
}else{
if( b>a+49 ) return b;
if( b>a+31 ) return b+1;
return b+x[b-a];
}
}
/*
** Convert an integer into a LogEst. In other words, compute an
** approximation for 10*log2(x).
*/
LogEst sqlite3LogEst(u64 x){
static LogEst a[] = { 0, 2, 3, 5, 6, 7, 8, 9 };
LogEst y = 40;
if( x<8 ){
if( x<2 ) return 0;
while( x<8 ){ y -= 10; x <<= 1; }
}else{
#if GCC_VERSION>=5004000
int i = 60 - __builtin_clzll(x);
y += i*10;
x >>= i;
#else
while( x>255 ){ y += 40; x >>= 4; } /*OPTIMIZATION-IF-TRUE*/
while( x>15 ){ y += 10; x >>= 1; }
#endif
}
return a[x&7] + y - 10;
}
/*
** Convert a double into a LogEst
** In other words, compute an approximation for 10*log2(x).
*/
LogEst sqlite3LogEstFromDouble(double x){
u64 a;
LogEst e;
assert( sizeof(x)==8 && sizeof(a)==8 );
if( x<=1 ) return 0;
if( x<=2000000000 ) return sqlite3LogEst((u64)x);
memcpy(&a, &x, 8);
e = (a>>52) - 1022;
return e*10;
}
/*
** Convert a LogEst into an integer.
*/
u64 sqlite3LogEstToInt(LogEst x){
u64 n;
n = x%10;
x /= 10;
if( n>=5 ) n -= 2;
else if( n>=1 ) n -= 1;
if( x>60 ) return (u64)LARGEST_INT64;
return x>=3 ? (n+8)<<(x-3) : (n+8)>>(3-x);
}
/*
** Add a new name/number pair to a VList. This might require that the
** VList object be reallocated, so return the new VList. If an OOM
** error occurs, the original VList returned and the
** db->mallocFailed flag is set.
**
** A VList is really just an array of integers. To destroy a VList,
** simply pass it to sqlite3DbFree().
**
** The first integer is the number of integers allocated for the whole
** VList. The second integer is the number of integers actually used.
** Each name/number pair is encoded by subsequent groups of 3 or more
** integers.
**
** Each name/number pair starts with two integers which are the numeric
** value for the pair and the size of the name/number pair, respectively.
** The text name overlays one or more following integers. The text name
** is always zero-terminated.
**
** Conceptually:
**
** struct VList {
** int nAlloc; // Number of allocated slots
** int nUsed; // Number of used slots
** struct VListEntry {
** int iValue; // Value for this entry
** int nSlot; // Slots used by this entry
** // ... variable name goes here
** } a[0];
** }
**
** During code generation, pointers to the variable names within the
** VList are taken. When that happens, nAlloc is set to zero as an
** indication that the VList may never again be enlarged, since the
** accompanying realloc() would invalidate the pointers.
*/
VList *sqlite3VListAdd(
sqlite3 *db, /* The database connection used for malloc() */
VList *pIn, /* The input VList. Might be NULL */
const char *zName, /* Name of symbol to add */
int nName, /* Bytes of text in zName */
int iVal /* Value to associate with zName */
){
int nInt; /* number of sizeof(int) objects needed for zName */
char *z; /* Pointer to where zName will be stored */
int i; /* Index in pIn[] where zName is stored */
nInt = nName/4 + 3;
assert( pIn==0 || pIn[0]>=3 ); /* Verify ok to add new elements */
if( pIn==0 || pIn[1]+nInt > pIn[0] ){
/* Enlarge the allocation */
sqlite3_int64 nAlloc = (pIn ? 2*(sqlite3_int64)pIn[0] : 10) + nInt;
VList *pOut = sqlite3DbRealloc(db, pIn, nAlloc*sizeof(int));
if( pOut==0 ) return pIn;
if( pIn==0 ) pOut[1] = 2;
pIn = pOut;
pIn[0] = nAlloc;
}
i = pIn[1];
pIn[i] = iVal;
pIn[i+1] = nInt;
z = (char*)&pIn[i+2];
pIn[1] = i+nInt;
assert( pIn[1]<=pIn[0] );
memcpy(z, zName, nName);
z[nName] = 0;
return pIn;
}
/*
** Return a pointer to the name of a variable in the given VList that
** has the value iVal. Or return a NULL if there is no such variable in
** the list
*/
const char *sqlite3VListNumToName(VList *pIn, int iVal){
int i, mx;
if( pIn==0 ) return 0;
mx = pIn[1];
i = 2;
do{
if( pIn[i]==iVal ) return (char*)&pIn[i+2];
i += pIn[i+1];
}while( i<mx );
return 0;
}
/*
** Return the number of the variable named zName, if it is in VList.
** or return 0 if there is no such variable.
*/
int sqlite3VListNameToNum(VList *pIn, const char *zName, int nName){
int i, mx;
if( pIn==0 ) return 0;
mx = pIn[1];
i = 2;
do{
const char *z = (const char*)&pIn[i+2];
if( strncmp(z,zName,nName)==0 && z[nName]==0 ) return pIn[i];
i += pIn[i+1];
}while( i<mx );
return 0;
}
| 45,824 | 1,712 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/completion.c | /*
** 2017-07-10
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file implements an eponymous virtual table that returns suggested
** completions for a partial SQL input.
**
** Suggested usage:
**
** SELECT DISTINCT candidate COLLATE nocase
** FROM completion($prefix,$wholeline)
** ORDER BY 1;
**
** The two query parameters are optional. $prefix is the text of the
** current word being typed and that is to be completed. $wholeline is
** the complete input line, used for context.
**
** The raw completion() table might return the same candidate multiple
** times, for example if the same column name is used to two or more
** tables. And the candidates are returned in an arbitrary order. Hence,
** the DISTINCT and ORDER BY are recommended.
**
** This virtual table operates at the speed of human typing, and so there
** is no attempt to make it fast. Even a slow implementation will be much
** faster than any human can type.
**
*/
#include "libc/assert.h"
#include "libc/str/str.h"
#include "third_party/sqlite3/sqlite3ext.h"
// clang-format off
SQLITE_EXTENSION_INIT1
#ifndef SQLITE_OMIT_VIRTUALTABLE
/* completion_vtab is a subclass of sqlite3_vtab which will
** serve as the underlying representation of a completion virtual table
*/
typedef struct completion_vtab completion_vtab;
struct completion_vtab {
sqlite3_vtab base; /* Base class - must be first */
sqlite3 *db; /* Database connection for this completion vtab */
};
/* completion_cursor is a subclass of sqlite3_vtab_cursor which will
** serve as the underlying representation of a cursor that scans
** over rows of the result
*/
typedef struct completion_cursor completion_cursor;
struct completion_cursor {
sqlite3_vtab_cursor base; /* Base class - must be first */
sqlite3 *db; /* Database connection for this cursor */
int nPrefix, nLine; /* Number of bytes in zPrefix and zLine */
char *zPrefix; /* The prefix for the word we want to complete */
char *zLine; /* The whole that we want to complete */
const char *zCurrentRow; /* Current output row */
int szRow; /* Length of the zCurrentRow string */
sqlite3_stmt *pStmt; /* Current statement */
sqlite3_int64 iRowid; /* The rowid */
int ePhase; /* Current phase */
int j; /* inter-phase counter */
};
/* Values for ePhase:
*/
#define COMPLETION_FIRST_PHASE 1
#define COMPLETION_KEYWORDS 1
#define COMPLETION_PRAGMAS 2
#define COMPLETION_FUNCTIONS 3
#define COMPLETION_COLLATIONS 4
#define COMPLETION_INDEXES 5
#define COMPLETION_TRIGGERS 6
#define COMPLETION_DATABASES 7
#define COMPLETION_TABLES 8 /* Also VIEWs and TRIGGERs */
#define COMPLETION_COLUMNS 9
#define COMPLETION_MODULES 10
#define COMPLETION_EOF 11
/*
** The completionConnect() method is invoked to create a new
** completion_vtab that describes the completion virtual table.
**
** Think of this routine as the constructor for completion_vtab objects.
**
** All this routine needs to do is:
**
** (1) Allocate the completion_vtab object and initialize all fields.
**
** (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the
** result set of queries against completion will look like.
*/
static int completionConnect(
sqlite3 *db,
void *pAux,
int argc, const char *const*argv,
sqlite3_vtab **ppVtab,
char **pzErr
){
completion_vtab *pNew;
int rc;
(void)(pAux); /* Unused parameter */
(void)(argc); /* Unused parameter */
(void)(argv); /* Unused parameter */
(void)(pzErr); /* Unused parameter */
/* Column numbers */
#define COMPLETION_COLUMN_CANDIDATE 0 /* Suggested completion of the input */
#define COMPLETION_COLUMN_PREFIX 1 /* Prefix of the word to be completed */
#define COMPLETION_COLUMN_WHOLELINE 2 /* Entire line seen so far */
#define COMPLETION_COLUMN_PHASE 3 /* ePhase - used for debugging only */
sqlite3_vtab_config(db, SQLITE_VTAB_INNOCUOUS);
rc = sqlite3_declare_vtab(db,
"CREATE TABLE x("
" candidate TEXT,"
" prefix TEXT HIDDEN,"
" wholeline TEXT HIDDEN,"
" phase INT HIDDEN" /* Used for debugging only */
")");
if( rc==SQLITE_OK ){
pNew = sqlite3_malloc( sizeof(*pNew) );
*ppVtab = (sqlite3_vtab*)pNew;
if( pNew==0 ) return SQLITE_NOMEM;
memset(pNew, 0, sizeof(*pNew));
pNew->db = db;
}
return rc;
}
/*
** This method is the destructor for completion_cursor objects.
*/
static int completionDisconnect(sqlite3_vtab *pVtab){
sqlite3_free(pVtab);
return SQLITE_OK;
}
/*
** Constructor for a new completion_cursor object.
*/
static int completionOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
completion_cursor *pCur;
pCur = sqlite3_malloc( sizeof(*pCur) );
if( pCur==0 ) return SQLITE_NOMEM;
memset(pCur, 0, sizeof(*pCur));
pCur->db = ((completion_vtab*)p)->db;
*ppCursor = &pCur->base;
return SQLITE_OK;
}
/*
** Reset the completion_cursor.
*/
static void completionCursorReset(completion_cursor *pCur){
sqlite3_free(pCur->zPrefix); pCur->zPrefix = 0; pCur->nPrefix = 0;
sqlite3_free(pCur->zLine); pCur->zLine = 0; pCur->nLine = 0;
sqlite3_finalize(pCur->pStmt); pCur->pStmt = 0;
pCur->j = 0;
}
/*
** Destructor for a completion_cursor.
*/
static int completionClose(sqlite3_vtab_cursor *cur){
completionCursorReset((completion_cursor*)cur);
sqlite3_free(cur);
return SQLITE_OK;
}
/*
** Advance a completion_cursor to its next row of output.
**
** The ->ePhase, ->j, and ->pStmt fields of the completion_cursor object
** record the current state of the scan. This routine sets ->zCurrentRow
** to the current row of output and then returns. If no more rows remain,
** then ->ePhase is set to COMPLETION_EOF which will signal the virtual
** table that has reached the end of its scan.
**
** The current implementation just lists potential identifiers and
** keywords and filters them by zPrefix. Future enhancements should
** take zLine into account to try to restrict the set of identifiers and
** keywords based on what would be legal at the current point of input.
*/
static int completionNext(sqlite3_vtab_cursor *cur){
completion_cursor *pCur = (completion_cursor*)cur;
int eNextPhase = 0; /* Next phase to try if current phase reaches end */
int iCol = -1; /* If >=0, step pCur->pStmt and use the i-th column */
pCur->iRowid++;
while( pCur->ePhase!=COMPLETION_EOF ){
switch( pCur->ePhase ){
case COMPLETION_KEYWORDS: {
if( pCur->j >= sqlite3_keyword_count() ){
pCur->zCurrentRow = 0;
pCur->ePhase = COMPLETION_DATABASES;
}else{
sqlite3_keyword_name(pCur->j++, &pCur->zCurrentRow, &pCur->szRow);
}
iCol = -1;
break;
}
case COMPLETION_DATABASES: {
if( pCur->pStmt==0 ){
sqlite3_prepare_v2(pCur->db, "PRAGMA database_list", -1,
&pCur->pStmt, 0);
}
iCol = 1;
eNextPhase = COMPLETION_TABLES;
break;
}
case COMPLETION_TABLES: {
if( pCur->pStmt==0 ){
sqlite3_stmt *pS2;
char *zSql = 0;
const char *zSep = "";
sqlite3_prepare_v2(pCur->db, "PRAGMA database_list", -1, &pS2, 0);
while( sqlite3_step(pS2)==SQLITE_ROW ){
const char *zDb = (const char*)sqlite3_column_text(pS2, 1);
zSql = sqlite3_mprintf(
"%z%s"
"SELECT name FROM \"%w\".sqlite_schema",
zSql, zSep, zDb
);
if( zSql==0 ) return SQLITE_NOMEM;
zSep = " UNION ";
}
sqlite3_finalize(pS2);
sqlite3_prepare_v2(pCur->db, zSql, -1, &pCur->pStmt, 0);
sqlite3_free(zSql);
}
iCol = 0;
eNextPhase = COMPLETION_COLUMNS;
break;
}
case COMPLETION_COLUMNS: {
if( pCur->pStmt==0 ){
sqlite3_stmt *pS2;
char *zSql = 0;
const char *zSep = "";
sqlite3_prepare_v2(pCur->db, "PRAGMA database_list", -1, &pS2, 0);
while( sqlite3_step(pS2)==SQLITE_ROW ){
const char *zDb = (const char*)sqlite3_column_text(pS2, 1);
zSql = sqlite3_mprintf(
"%z%s"
"SELECT pti.name FROM \"%w\".sqlite_schema AS sm"
" JOIN pragma_table_info(sm.name,%Q) AS pti"
" WHERE sm.type='table'",
zSql, zSep, zDb, zDb
);
if( zSql==0 ) return SQLITE_NOMEM;
zSep = " UNION ";
}
sqlite3_finalize(pS2);
sqlite3_prepare_v2(pCur->db, zSql, -1, &pCur->pStmt, 0);
sqlite3_free(zSql);
}
iCol = 0;
eNextPhase = COMPLETION_EOF;
break;
}
}
if( iCol<0 ){
/* This case is when the phase presets zCurrentRow */
if( pCur->zCurrentRow==0 ) continue;
}else{
if( sqlite3_step(pCur->pStmt)==SQLITE_ROW ){
/* Extract the next row of content */
pCur->zCurrentRow = (const char*)sqlite3_column_text(pCur->pStmt, iCol);
pCur->szRow = sqlite3_column_bytes(pCur->pStmt, iCol);
}else{
/* When all rows are finished, advance to the next phase */
sqlite3_finalize(pCur->pStmt);
pCur->pStmt = 0;
pCur->ePhase = eNextPhase;
continue;
}
}
if( pCur->nPrefix==0 ) break;
if( pCur->nPrefix<=pCur->szRow
&& sqlite3_strnicmp(pCur->zPrefix, pCur->zCurrentRow, pCur->nPrefix)==0
){
break;
}
}
return SQLITE_OK;
}
/*
** Return values of columns for the row at which the completion_cursor
** is currently pointing.
*/
static int completionColumn(
sqlite3_vtab_cursor *cur, /* The cursor */
sqlite3_context *ctx, /* First argument to sqlite3_result_...() */
int i /* Which column to return */
){
completion_cursor *pCur = (completion_cursor*)cur;
switch( i ){
case COMPLETION_COLUMN_CANDIDATE: {
sqlite3_result_text(ctx, pCur->zCurrentRow, pCur->szRow,SQLITE_TRANSIENT);
break;
}
case COMPLETION_COLUMN_PREFIX: {
sqlite3_result_text(ctx, pCur->zPrefix, -1, SQLITE_TRANSIENT);
break;
}
case COMPLETION_COLUMN_WHOLELINE: {
sqlite3_result_text(ctx, pCur->zLine, -1, SQLITE_TRANSIENT);
break;
}
case COMPLETION_COLUMN_PHASE: {
sqlite3_result_int(ctx, pCur->ePhase);
break;
}
}
return SQLITE_OK;
}
/*
** Return the rowid for the current row. In this implementation, the
** rowid is the same as the output value.
*/
static int completionRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
completion_cursor *pCur = (completion_cursor*)cur;
*pRowid = pCur->iRowid;
return SQLITE_OK;
}
/*
** Return TRUE if the cursor has been moved off of the last
** row of output.
*/
static int completionEof(sqlite3_vtab_cursor *cur){
completion_cursor *pCur = (completion_cursor*)cur;
return pCur->ePhase >= COMPLETION_EOF;
}
/*
** This method is called to "rewind" the completion_cursor object back
** to the first row of output. This method is always called at least
** once prior to any call to completionColumn() or completionRowid() or
** completionEof().
*/
static int completionFilter(
sqlite3_vtab_cursor *pVtabCursor,
int idxNum, const char *idxStr,
int argc, sqlite3_value **argv
){
completion_cursor *pCur = (completion_cursor *)pVtabCursor;
int iArg = 0;
(void)(idxStr); /* Unused parameter */
(void)(argc); /* Unused parameter */
completionCursorReset(pCur);
if( idxNum & 1 ){
pCur->nPrefix = sqlite3_value_bytes(argv[iArg]);
if( pCur->nPrefix>0 ){
pCur->zPrefix = sqlite3_mprintf("%s", sqlite3_value_text(argv[iArg]));
if( pCur->zPrefix==0 ) return SQLITE_NOMEM;
}
iArg = 1;
}
if( idxNum & 2 ){
pCur->nLine = sqlite3_value_bytes(argv[iArg]);
if( pCur->nLine>0 ){
pCur->zLine = sqlite3_mprintf("%s", sqlite3_value_text(argv[iArg]));
if( pCur->zLine==0 ) return SQLITE_NOMEM;
}
}
if( pCur->zLine!=0 && pCur->zPrefix==0 ){
int i = pCur->nLine;
while( i>0 && (isalnum(pCur->zLine[i-1]) || pCur->zLine[i-1]=='_') ){
i--;
}
pCur->nPrefix = pCur->nLine - i;
if( pCur->nPrefix>0 ){
pCur->zPrefix = sqlite3_mprintf("%.*s", pCur->nPrefix, pCur->zLine + i);
if( pCur->zPrefix==0 ) return SQLITE_NOMEM;
}
}
pCur->iRowid = 0;
pCur->ePhase = COMPLETION_FIRST_PHASE;
return completionNext(pVtabCursor);
}
/*
** SQLite will invoke this method one or more times while planning a query
** that uses the completion virtual table. This routine needs to create
** a query plan for each invocation and compute an estimated cost for that
** plan.
**
** There are two hidden parameters that act as arguments to the table-valued
** function: "prefix" and "wholeline". Bit 0 of idxNum is set if "prefix"
** is available and bit 1 is set if "wholeline" is available.
*/
static int completionBestIndex(
sqlite3_vtab *tab,
sqlite3_index_info *pIdxInfo
){
int i; /* Loop over constraints */
int idxNum = 0; /* The query plan bitmask */
int prefixIdx = -1; /* Index of the start= constraint, or -1 if none */
int wholelineIdx = -1; /* Index of the stop= constraint, or -1 if none */
int nArg = 0; /* Number of arguments that completeFilter() expects */
const struct sqlite3_index_constraint *pConstraint;
(void)(tab); /* Unused parameter */
pConstraint = pIdxInfo->aConstraint;
for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
if( pConstraint->usable==0 ) continue;
if( pConstraint->op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
switch( pConstraint->iColumn ){
case COMPLETION_COLUMN_PREFIX:
prefixIdx = i;
idxNum |= 1;
break;
case COMPLETION_COLUMN_WHOLELINE:
wholelineIdx = i;
idxNum |= 2;
break;
}
}
if( prefixIdx>=0 ){
pIdxInfo->aConstraintUsage[prefixIdx].argvIndex = ++nArg;
pIdxInfo->aConstraintUsage[prefixIdx].omit = 1;
}
if( wholelineIdx>=0 ){
pIdxInfo->aConstraintUsage[wholelineIdx].argvIndex = ++nArg;
pIdxInfo->aConstraintUsage[wholelineIdx].omit = 1;
}
pIdxInfo->idxNum = idxNum;
pIdxInfo->estimatedCost = (double)5000 - 1000*nArg;
pIdxInfo->estimatedRows = 500 - 100*nArg;
return SQLITE_OK;
}
/*
** This following structure defines all the methods for the
** completion virtual table.
*/
static sqlite3_module completionModule = {
0, /* iVersion */
0, /* xCreate */
completionConnect, /* xConnect */
completionBestIndex, /* xBestIndex */
completionDisconnect, /* xDisconnect */
0, /* xDestroy */
completionOpen, /* xOpen - open a cursor */
completionClose, /* xClose - close a cursor */
completionFilter, /* xFilter - configure scan constraints */
completionNext, /* xNext - advance a cursor */
completionEof, /* xEof - check for end of scan */
completionColumn, /* xColumn - read data */
completionRowid, /* xRowid - read data */
0, /* xUpdate */
0, /* xBegin */
0, /* xSync */
0, /* xCommit */
0, /* xRollback */
0, /* xFindMethod */
0, /* xRename */
0, /* xSavepoint */
0, /* xRelease */
0, /* xRollbackTo */
0 /* xShadowName */
};
#endif /* SQLITE_OMIT_VIRTUALTABLE */
int sqlite3CompletionVtabInit(sqlite3 *db){
int rc = SQLITE_OK;
#ifndef SQLITE_OMIT_VIRTUALTABLE
rc = sqlite3_create_module(db, "completion", &completionModule, 0);
#endif
return rc;
}
int sqlite3_completion_init(
sqlite3 *db,
char **pzErrMsg,
const sqlite3_api_routines *pApi
){
int rc = SQLITE_OK;
SQLITE_EXTENSION_INIT2(pApi);
(void)(pzErrMsg); /* Unused parameter */
#ifndef SQLITE_OMIT_VIRTUALTABLE
rc = sqlite3CompletionVtabInit(db);
#endif
return rc;
}
| 16,676 | 500 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts5.shell.c | #include "third_party/sqlite3/fts5.c"
| 38 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/mutex.inc | /*
** 2007 August 28
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains the common header for all mutex implementations.
** The sqliteInt.h header #includes this file so that it is available
** to all source files. We break it out in an effort to keep the code
** better organized.
**
** NOTE: source files should *not* #include this header file directly.
** Source files should #include the sqliteInt.h file and let that file
** include this one indirectly.
*/
/*
** Figure out what version of the code to use. The choices are
**
** SQLITE_MUTEX_OMIT No mutex logic. Not even stubs. The
** mutexes implementation cannot be overridden
** at start-time.
**
** SQLITE_MUTEX_NOOP For single-threaded applications. No
** mutual exclusion is provided. But this
** implementation can be overridden at
** start-time.
**
** SQLITE_MUTEX_PTHREADS For multi-threaded applications on Unix.
**
** SQLITE_MUTEX_W32 For multi-threaded applications on Win32.
*/
#if !SQLITE_THREADSAFE
# define SQLITE_MUTEX_OMIT
#endif
#if SQLITE_THREADSAFE && !defined(SQLITE_MUTEX_NOOP)
# if SQLITE_OS_UNIX
# define SQLITE_MUTEX_PTHREADS
# elif SQLITE_OS_WIN
# define SQLITE_MUTEX_W32
# else
# define SQLITE_MUTEX_NOOP
# endif
#endif
#ifdef SQLITE_MUTEX_OMIT
/*
** If this is a no-op implementation, implement everything as macros.
*/
#define sqlite3_mutex_alloc(X) ((sqlite3_mutex*)8)
#define sqlite3_mutex_free(X)
#define sqlite3_mutex_enter(X)
#define sqlite3_mutex_try(X) SQLITE_OK
#define sqlite3_mutex_leave(X)
#define sqlite3_mutex_held(X) ((void)(X),1)
#define sqlite3_mutex_notheld(X) ((void)(X),1)
#define sqlite3MutexAlloc(X) ((sqlite3_mutex*)8)
#define sqlite3MutexInit() SQLITE_OK
#define sqlite3MutexEnd()
#define MUTEX_LOGIC(X)
#else
#define MUTEX_LOGIC(X) X
int sqlite3_mutex_held(sqlite3_mutex*);
#endif /* defined(SQLITE_MUTEX_OMIT) */
| 2,393 | 72 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/sqlite3expert.shell.c | #include "third_party/sqlite3/sqlite3expert.c"
| 47 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/callback.shell.c | #include "third_party/sqlite3/callback.c"
| 42 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/vdbeaux.c | /*
** 2003 September 6
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains code used for creating, destroying, and populating
** a VDBE (or an "sqlite3_stmt" as it is known to the outside world.)
*/
#include "third_party/sqlite3/sqliteInt.h"
#include "third_party/sqlite3/vdbeInt.inc"
/* Forward references */
static void freeEphemeralFunction(sqlite3 *db, FuncDef *pDef);
static void vdbeFreeOpArray(sqlite3 *, Op *, int);
/*
** Create a new virtual database engine.
*/
Vdbe *sqlite3VdbeCreate(Parse *pParse){
sqlite3 *db = pParse->db;
Vdbe *p;
p = sqlite3DbMallocRawNN(db, sizeof(Vdbe) );
if( p==0 ) return 0;
memset(&p->aOp, 0, sizeof(Vdbe)-offsetof(Vdbe,aOp));
p->db = db;
if( db->pVdbe ){
db->pVdbe->ppVPrev = &p->pVNext;
}
p->pVNext = db->pVdbe;
p->ppVPrev = &db->pVdbe;
db->pVdbe = p;
assert( p->eVdbeState==VDBE_INIT_STATE );
p->pParse = pParse;
pParse->pVdbe = p;
assert( pParse->aLabel==0 );
assert( pParse->nLabel==0 );
assert( p->nOpAlloc==0 );
assert( pParse->szOpAlloc==0 );
sqlite3VdbeAddOp2(p, OP_Init, 0, 1);
return p;
}
/*
** Return the Parse object that owns a Vdbe object.
*/
Parse *sqlite3VdbeParser(Vdbe *p){
return p->pParse;
}
/*
** Change the error string stored in Vdbe.zErrMsg
*/
void sqlite3VdbeError(Vdbe *p, const char *zFormat, ...){
va_list ap;
sqlite3DbFree(p->db, p->zErrMsg);
va_start(ap, zFormat);
p->zErrMsg = sqlite3VMPrintf(p->db, zFormat, ap);
va_end(ap);
}
/*
** Remember the SQL string for a prepared statement.
*/
void sqlite3VdbeSetSql(Vdbe *p, const char *z, int n, u8 prepFlags){
if( p==0 ) return;
p->prepFlags = prepFlags;
if( (prepFlags & SQLITE_PREPARE_SAVESQL)==0 ){
p->expmask = 0;
}
assert( p->zSql==0 );
p->zSql = sqlite3DbStrNDup(p->db, z, n);
}
#ifdef SQLITE_ENABLE_NORMALIZE
/*
** Add a new element to the Vdbe->pDblStr list.
*/
void sqlite3VdbeAddDblquoteStr(sqlite3 *db, Vdbe *p, const char *z){
if( p ){
int n = sqlite3Strlen30(z);
DblquoteStr *pStr = sqlite3DbMallocRawNN(db,
sizeof(*pStr)+n+1-sizeof(pStr->z));
if( pStr ){
pStr->pNextStr = p->pDblStr;
p->pDblStr = pStr;
memcpy(pStr->z, z, n+1);
}
}
}
#endif
#ifdef SQLITE_ENABLE_NORMALIZE
/*
** zId of length nId is a double-quoted identifier. Check to see if
** that identifier is really used as a string literal.
*/
int sqlite3VdbeUsesDoubleQuotedString(
Vdbe *pVdbe, /* The prepared statement */
const char *zId /* The double-quoted identifier, already dequoted */
){
DblquoteStr *pStr;
assert( zId!=0 );
if( pVdbe->pDblStr==0 ) return 0;
for(pStr=pVdbe->pDblStr; pStr; pStr=pStr->pNextStr){
if( strcmp(zId, pStr->z)==0 ) return 1;
}
return 0;
}
#endif
/*
** Swap byte-code between two VDBE structures.
**
** This happens after pB was previously run and returned
** SQLITE_SCHEMA. The statement was then reprepared in pA.
** This routine transfers the new bytecode in pA over to pB
** so that pB can be run again. The old pB byte code is
** moved back to pA so that it will be cleaned up when pA is
** finalized.
*/
void sqlite3VdbeSwap(Vdbe *pA, Vdbe *pB){
Vdbe tmp, *pTmp, **ppTmp;
char *zTmp;
assert( pA->db==pB->db );
tmp = *pA;
*pA = *pB;
*pB = tmp;
pTmp = pA->pVNext;
pA->pVNext = pB->pVNext;
pB->pVNext = pTmp;
ppTmp = pA->ppVPrev;
pA->ppVPrev = pB->ppVPrev;
pB->ppVPrev = ppTmp;
zTmp = pA->zSql;
pA->zSql = pB->zSql;
pB->zSql = zTmp;
#ifdef SQLITE_ENABLE_NORMALIZE
zTmp = pA->zNormSql;
pA->zNormSql = pB->zNormSql;
pB->zNormSql = zTmp;
#endif
pB->expmask = pA->expmask;
pB->prepFlags = pA->prepFlags;
memcpy(pB->aCounter, pA->aCounter, sizeof(pB->aCounter));
pB->aCounter[SQLITE_STMTSTATUS_REPREPARE]++;
}
/*
** Resize the Vdbe.aOp array so that it is at least nOp elements larger
** than its current size. nOp is guaranteed to be less than or equal
** to 1024/sizeof(Op).
**
** If an out-of-memory error occurs while resizing the array, return
** SQLITE_NOMEM. In this case Vdbe.aOp and Vdbe.nOpAlloc remain
** unchanged (this is so that any opcodes already allocated can be
** correctly deallocated along with the rest of the Vdbe).
*/
static int growOpArray(Vdbe *v, int nOp){
VdbeOp *pNew;
Parse *p = v->pParse;
/* The SQLITE_TEST_REALLOC_STRESS compile-time option is designed to force
** more frequent reallocs and hence provide more opportunities for
** simulated OOM faults. SQLITE_TEST_REALLOC_STRESS is generally used
** during testing only. With SQLITE_TEST_REALLOC_STRESS grow the op array
** by the minimum* amount required until the size reaches 512. Normal
** operation (without SQLITE_TEST_REALLOC_STRESS) is to double the current
** size of the op array or add 1KB of space, whichever is smaller. */
#ifdef SQLITE_TEST_REALLOC_STRESS
sqlite3_int64 nNew = (v->nOpAlloc>=512 ? 2*(sqlite3_int64)v->nOpAlloc
: (sqlite3_int64)v->nOpAlloc+nOp);
#else
sqlite3_int64 nNew = (v->nOpAlloc ? 2*(sqlite3_int64)v->nOpAlloc
: (sqlite3_int64)(1024/sizeof(Op)));
UNUSED_PARAMETER(nOp);
#endif
/* Ensure that the size of a VDBE does not grow too large */
if( nNew > p->db->aLimit[SQLITE_LIMIT_VDBE_OP] ){
sqlite3OomFault(p->db);
return SQLITE_NOMEM;
}
assert( nOp<=(int)(1024/sizeof(Op)) );
assert( nNew>=(v->nOpAlloc+nOp) );
pNew = sqlite3DbRealloc(p->db, v->aOp, nNew*sizeof(Op));
if( pNew ){
p->szOpAlloc = sqlite3DbMallocSize(p->db, pNew);
v->nOpAlloc = p->szOpAlloc/sizeof(Op);
v->aOp = pNew;
}
return (pNew ? SQLITE_OK : SQLITE_NOMEM_BKPT);
}
#ifdef SQLITE_DEBUG
/* This routine is just a convenient place to set a breakpoint that will
** fire after each opcode is inserted and displayed using
** "PRAGMA vdbe_addoptrace=on". Parameters "pc" (program counter) and
** pOp are available to make the breakpoint conditional.
**
** Other useful labels for breakpoints include:
** test_trace_breakpoint(pc,pOp)
** sqlite3CorruptError(lineno)
** sqlite3MisuseError(lineno)
** sqlite3CantopenError(lineno)
*/
static void test_addop_breakpoint(int pc, Op *pOp){
static int n = 0;
n++;
}
#endif
/*
** Add a new instruction to the list of instructions current in the
** VDBE. Return the address of the new instruction.
**
** Parameters:
**
** p Pointer to the VDBE
**
** op The opcode for this instruction
**
** p1, p2, p3 Operands
**
** Use the sqlite3VdbeResolveLabel() function to fix an address and
** the sqlite3VdbeChangeP4() function to change the value of the P4
** operand.
*/
static SQLITE_NOINLINE int growOp3(Vdbe *p, int op, int p1, int p2, int p3){
assert( p->nOpAlloc<=p->nOp );
if( growOpArray(p, 1) ) return 1;
assert( p->nOpAlloc>p->nOp );
return sqlite3VdbeAddOp3(p, op, p1, p2, p3);
}
int sqlite3VdbeAddOp3(Vdbe *p, int op, int p1, int p2, int p3){
int i;
VdbeOp *pOp;
i = p->nOp;
assert( p->eVdbeState==VDBE_INIT_STATE );
assert( op>=0 && op<0xff );
if( p->nOpAlloc<=i ){
return growOp3(p, op, p1, p2, p3);
}
assert( p->aOp!=0 );
p->nOp++;
pOp = &p->aOp[i];
assert( pOp!=0 );
pOp->opcode = (u8)op;
pOp->p5 = 0;
pOp->p1 = p1;
pOp->p2 = p2;
pOp->p3 = p3;
pOp->p4.p = 0;
pOp->p4type = P4_NOTUSED;
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
pOp->zComment = 0;
#endif
#ifdef SQLITE_DEBUG
if( p->db->flags & SQLITE_VdbeAddopTrace ){
sqlite3VdbePrintOp(0, i, &p->aOp[i]);
test_addop_breakpoint(i, &p->aOp[i]);
}
#endif
#ifdef VDBE_PROFILE
pOp->cycles = 0;
pOp->cnt = 0;
#endif
#ifdef SQLITE_VDBE_COVERAGE
pOp->iSrcLine = 0;
#endif
return i;
}
int sqlite3VdbeAddOp0(Vdbe *p, int op){
return sqlite3VdbeAddOp3(p, op, 0, 0, 0);
}
int sqlite3VdbeAddOp1(Vdbe *p, int op, int p1){
return sqlite3VdbeAddOp3(p, op, p1, 0, 0);
}
int sqlite3VdbeAddOp2(Vdbe *p, int op, int p1, int p2){
return sqlite3VdbeAddOp3(p, op, p1, p2, 0);
}
/* Generate code for an unconditional jump to instruction iDest
*/
int sqlite3VdbeGoto(Vdbe *p, int iDest){
return sqlite3VdbeAddOp3(p, OP_Goto, 0, iDest, 0);
}
/* Generate code to cause the string zStr to be loaded into
** register iDest
*/
int sqlite3VdbeLoadString(Vdbe *p, int iDest, const char *zStr){
return sqlite3VdbeAddOp4(p, OP_String8, 0, iDest, 0, zStr, 0);
}
/*
** Generate code that initializes multiple registers to string or integer
** constants. The registers begin with iDest and increase consecutively.
** One register is initialized for each characgter in zTypes[]. For each
** "s" character in zTypes[], the register is a string if the argument is
** not NULL, or OP_Null if the value is a null pointer. For each "i" character
** in zTypes[], the register is initialized to an integer.
**
** If the input string does not end with "X" then an OP_ResultRow instruction
** is generated for the values inserted.
*/
void sqlite3VdbeMultiLoad(Vdbe *p, int iDest, const char *zTypes, ...){
va_list ap;
int i;
char c;
va_start(ap, zTypes);
for(i=0; (c = zTypes[i])!=0; i++){
if( c=='s' ){
const char *z = va_arg(ap, const char*);
sqlite3VdbeAddOp4(p, z==0 ? OP_Null : OP_String8, 0, iDest+i, 0, z, 0);
}else if( c=='i' ){
sqlite3VdbeAddOp2(p, OP_Integer, va_arg(ap, int), iDest+i);
}else{
goto skip_op_resultrow;
}
}
sqlite3VdbeAddOp2(p, OP_ResultRow, iDest, i);
skip_op_resultrow:
va_end(ap);
}
/*
** Add an opcode that includes the p4 value as a pointer.
*/
int sqlite3VdbeAddOp4(
Vdbe *p, /* Add the opcode to this VM */
int op, /* The new opcode */
int p1, /* The P1 operand */
int p2, /* The P2 operand */
int p3, /* The P3 operand */
const char *zP4, /* The P4 operand */
int p4type /* P4 operand type */
){
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
sqlite3VdbeChangeP4(p, addr, zP4, p4type);
return addr;
}
/*
** Add an OP_Function or OP_PureFunc opcode.
**
** The eCallCtx argument is information (typically taken from Expr.op2)
** that describes the calling context of the function. 0 means a general
** function call. NC_IsCheck means called by a check constraint,
** NC_IdxExpr means called as part of an index expression. NC_PartIdx
** means in the WHERE clause of a partial index. NC_GenCol means called
** while computing a generated column value. 0 is the usual case.
*/
int sqlite3VdbeAddFunctionCall(
Parse *pParse, /* Parsing context */
int p1, /* Constant argument mask */
int p2, /* First argument register */
int p3, /* Register into which results are written */
int nArg, /* Number of argument */
const FuncDef *pFunc, /* The function to be invoked */
int eCallCtx /* Calling context */
){
Vdbe *v = pParse->pVdbe;
int nByte;
int addr;
sqlite3_context *pCtx;
assert( v );
nByte = sizeof(*pCtx) + (nArg-1)*sizeof(sqlite3_value*);
pCtx = sqlite3DbMallocRawNN(pParse->db, nByte);
if( pCtx==0 ){
assert( pParse->db->mallocFailed );
freeEphemeralFunction(pParse->db, (FuncDef*)pFunc);
return 0;
}
pCtx->pOut = 0;
pCtx->pFunc = (FuncDef*)pFunc;
pCtx->pVdbe = 0;
pCtx->isError = 0;
pCtx->argc = nArg;
pCtx->iOp = sqlite3VdbeCurrentAddr(v);
addr = sqlite3VdbeAddOp4(v, eCallCtx ? OP_PureFunc : OP_Function,
p1, p2, p3, (char*)pCtx, P4_FUNCCTX);
sqlite3VdbeChangeP5(v, eCallCtx & NC_SelfRef);
sqlite3MayAbort(pParse);
return addr;
}
/*
** Add an opcode that includes the p4 value with a P4_INT64 or
** P4_REAL type.
*/
int sqlite3VdbeAddOp4Dup8(
Vdbe *p, /* Add the opcode to this VM */
int op, /* The new opcode */
int p1, /* The P1 operand */
int p2, /* The P2 operand */
int p3, /* The P3 operand */
const u8 *zP4, /* The P4 operand */
int p4type /* P4 operand type */
){
char *p4copy = sqlite3DbMallocRawNN(sqlite3VdbeDb(p), 8);
if( p4copy ) memcpy(p4copy, zP4, 8);
return sqlite3VdbeAddOp4(p, op, p1, p2, p3, p4copy, p4type);
}
#ifndef SQLITE_OMIT_EXPLAIN
/*
** Return the address of the current EXPLAIN QUERY PLAN baseline.
** 0 means "none".
*/
int sqlite3VdbeExplainParent(Parse *pParse){
VdbeOp *pOp;
if( pParse->addrExplain==0 ) return 0;
pOp = sqlite3VdbeGetOp(pParse->pVdbe, pParse->addrExplain);
return pOp->p2;
}
/*
** Set a debugger breakpoint on the following routine in order to
** monitor the EXPLAIN QUERY PLAN code generation.
*/
#if defined(SQLITE_DEBUG)
void sqlite3ExplainBreakpoint(const char *z1, const char *z2){
(void)z1;
(void)z2;
}
#endif
/*
** Add a new OP_Explain opcode.
**
** If the bPush flag is true, then make this opcode the parent for
** subsequent Explains until sqlite3VdbeExplainPop() is called.
*/
void sqlite3VdbeExplain(Parse *pParse, u8 bPush, const char *zFmt, ...){
#ifndef SQLITE_DEBUG
/* Always include the OP_Explain opcodes if SQLITE_DEBUG is defined.
** But omit them (for performance) during production builds */
if( pParse->explain==2 )
#endif
{
char *zMsg;
Vdbe *v;
va_list ap;
int iThis;
va_start(ap, zFmt);
zMsg = sqlite3VMPrintf(pParse->db, zFmt, ap);
va_end(ap);
v = pParse->pVdbe;
iThis = v->nOp;
sqlite3VdbeAddOp4(v, OP_Explain, iThis, pParse->addrExplain, 0,
zMsg, P4_DYNAMIC);
sqlite3ExplainBreakpoint(bPush?"PUSH":"", sqlite3VdbeGetLastOp(v)->p4.z);
if( bPush){
pParse->addrExplain = iThis;
}
}
}
/*
** Pop the EXPLAIN QUERY PLAN stack one level.
*/
void sqlite3VdbeExplainPop(Parse *pParse){
sqlite3ExplainBreakpoint("POP", 0);
pParse->addrExplain = sqlite3VdbeExplainParent(pParse);
}
#endif /* SQLITE_OMIT_EXPLAIN */
/*
** Add an OP_ParseSchema opcode. This routine is broken out from
** sqlite3VdbeAddOp4() since it needs to also needs to mark all btrees
** as having been used.
**
** The zWhere string must have been obtained from sqlite3_malloc().
** This routine will take ownership of the allocated memory.
*/
void sqlite3VdbeAddParseSchemaOp(Vdbe *p, int iDb, char *zWhere, u16 p5){
int j;
sqlite3VdbeAddOp4(p, OP_ParseSchema, iDb, 0, 0, zWhere, P4_DYNAMIC);
sqlite3VdbeChangeP5(p, p5);
for(j=0; j<p->db->nDb; j++) sqlite3VdbeUsesBtree(p, j);
sqlite3MayAbort(p->pParse);
}
/*
** Add an opcode that includes the p4 value as an integer.
*/
int sqlite3VdbeAddOp4Int(
Vdbe *p, /* Add the opcode to this VM */
int op, /* The new opcode */
int p1, /* The P1 operand */
int p2, /* The P2 operand */
int p3, /* The P3 operand */
int p4 /* The P4 operand as an integer */
){
int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
if( p->db->mallocFailed==0 ){
VdbeOp *pOp = &p->aOp[addr];
pOp->p4type = P4_INT32;
pOp->p4.i = p4;
}
return addr;
}
/* Insert the end of a co-routine
*/
void sqlite3VdbeEndCoroutine(Vdbe *v, int regYield){
sqlite3VdbeAddOp1(v, OP_EndCoroutine, regYield);
/* Clear the temporary register cache, thereby ensuring that each
** co-routine has its own independent set of registers, because co-routines
** might expect their registers to be preserved across an OP_Yield, and
** that could cause problems if two or more co-routines are using the same
** temporary register.
*/
v->pParse->nTempReg = 0;
v->pParse->nRangeReg = 0;
}
/*
** Create a new symbolic label for an instruction that has yet to be
** coded. The symbolic label is really just a negative number. The
** label can be used as the P2 value of an operation. Later, when
** the label is resolved to a specific address, the VDBE will scan
** through its operation list and change all values of P2 which match
** the label into the resolved address.
**
** The VDBE knows that a P2 value is a label because labels are
** always negative and P2 values are suppose to be non-negative.
** Hence, a negative P2 value is a label that has yet to be resolved.
** (Later:) This is only true for opcodes that have the OPFLG_JUMP
** property.
**
** Variable usage notes:
**
** Parse.aLabel[x] Stores the address that the x-th label resolves
** into. For testing (SQLITE_DEBUG), unresolved
** labels stores -1, but that is not required.
** Parse.nLabelAlloc Number of slots allocated to Parse.aLabel[]
** Parse.nLabel The *negative* of the number of labels that have
** been issued. The negative is stored because
** that gives a performance improvement over storing
** the equivalent positive value.
*/
int sqlite3VdbeMakeLabel(Parse *pParse){
return --pParse->nLabel;
}
/*
** Resolve label "x" to be the address of the next instruction to
** be inserted. The parameter "x" must have been obtained from
** a prior call to sqlite3VdbeMakeLabel().
*/
static SQLITE_NOINLINE void resizeResolveLabel(Parse *p, Vdbe *v, int j){
int nNewSize = 10 - p->nLabel;
p->aLabel = sqlite3DbReallocOrFree(p->db, p->aLabel,
nNewSize*sizeof(p->aLabel[0]));
if( p->aLabel==0 ){
p->nLabelAlloc = 0;
}else{
#ifdef SQLITE_DEBUG
int i;
for(i=p->nLabelAlloc; i<nNewSize; i++) p->aLabel[i] = -1;
#endif
p->nLabelAlloc = nNewSize;
p->aLabel[j] = v->nOp;
}
}
void sqlite3VdbeResolveLabel(Vdbe *v, int x){
Parse *p = v->pParse;
int j = ADDR(x);
assert( v->eVdbeState==VDBE_INIT_STATE );
assert( j<-p->nLabel );
assert( j>=0 );
#ifdef SQLITE_DEBUG
if( p->db->flags & SQLITE_VdbeAddopTrace ){
printf("RESOLVE LABEL %d to %d\n", x, v->nOp);
}
#endif
if( p->nLabelAlloc + p->nLabel < 0 ){
resizeResolveLabel(p,v,j);
}else{
assert( p->aLabel[j]==(-1) ); /* Labels may only be resolved once */
p->aLabel[j] = v->nOp;
}
}
/*
** Mark the VDBE as one that can only be run one time.
*/
void sqlite3VdbeRunOnlyOnce(Vdbe *p){
sqlite3VdbeAddOp2(p, OP_Expire, 1, 1);
}
/*
** Mark the VDBE as one that can be run multiple times.
*/
void sqlite3VdbeReusable(Vdbe *p){
int i;
for(i=1; ALWAYS(i<p->nOp); i++){
if( ALWAYS(p->aOp[i].opcode==OP_Expire) ){
p->aOp[1].opcode = OP_Noop;
break;
}
}
}
#ifdef SQLITE_DEBUG /* sqlite3AssertMayAbort() logic */
/*
** The following type and function are used to iterate through all opcodes
** in a Vdbe main program and each of the sub-programs (triggers) it may
** invoke directly or indirectly. It should be used as follows:
**
** Op *pOp;
** VdbeOpIter sIter;
**
** memset(&sIter, 0, sizeof(sIter));
** sIter.v = v; // v is of type Vdbe*
** while( (pOp = opIterNext(&sIter)) ){
** // Do something with pOp
** }
** sqlite3DbFree(v->db, sIter.apSub);
**
*/
typedef struct VdbeOpIter VdbeOpIter;
struct VdbeOpIter {
Vdbe *v; /* Vdbe to iterate through the opcodes of */
SubProgram **apSub; /* Array of subprograms */
int nSub; /* Number of entries in apSub */
int iAddr; /* Address of next instruction to return */
int iSub; /* 0 = main program, 1 = first sub-program etc. */
};
static Op *opIterNext(VdbeOpIter *p){
Vdbe *v = p->v;
Op *pRet = 0;
Op *aOp;
int nOp;
if( p->iSub<=p->nSub ){
if( p->iSub==0 ){
aOp = v->aOp;
nOp = v->nOp;
}else{
aOp = p->apSub[p->iSub-1]->aOp;
nOp = p->apSub[p->iSub-1]->nOp;
}
assert( p->iAddr<nOp );
pRet = &aOp[p->iAddr];
p->iAddr++;
if( p->iAddr==nOp ){
p->iSub++;
p->iAddr = 0;
}
if( pRet->p4type==P4_SUBPROGRAM ){
int nByte = (p->nSub+1)*sizeof(SubProgram*);
int j;
for(j=0; j<p->nSub; j++){
if( p->apSub[j]==pRet->p4.pProgram ) break;
}
if( j==p->nSub ){
p->apSub = sqlite3DbReallocOrFree(v->db, p->apSub, nByte);
if( !p->apSub ){
pRet = 0;
}else{
p->apSub[p->nSub++] = pRet->p4.pProgram;
}
}
}
}
return pRet;
}
/*
** Check if the program stored in the VM associated with pParse may
** throw an ABORT exception (causing the statement, but not entire transaction
** to be rolled back). This condition is true if the main program or any
** sub-programs contains any of the following:
**
** * OP_Halt with P1=SQLITE_CONSTRAINT and P2=OE_Abort.
** * OP_HaltIfNull with P1=SQLITE_CONSTRAINT and P2=OE_Abort.
** * OP_Destroy
** * OP_VUpdate
** * OP_VCreate
** * OP_VRename
** * OP_FkCounter with P2==0 (immediate foreign key constraint)
** * OP_CreateBtree/BTREE_INTKEY and OP_InitCoroutine
** (for CREATE TABLE AS SELECT ...)
**
** Then check that the value of Parse.mayAbort is true if an
** ABORT may be thrown, or false otherwise. Return true if it does
** match, or false otherwise. This function is intended to be used as
** part of an assert statement in the compiler. Similar to:
**
** assert( sqlite3VdbeAssertMayAbort(pParse->pVdbe, pParse->mayAbort) );
*/
int sqlite3VdbeAssertMayAbort(Vdbe *v, int mayAbort){
int hasAbort = 0;
int hasFkCounter = 0;
int hasCreateTable = 0;
int hasCreateIndex = 0;
int hasInitCoroutine = 0;
Op *pOp;
VdbeOpIter sIter;
if( v==0 ) return 0;
memset(&sIter, 0, sizeof(sIter));
sIter.v = v;
while( (pOp = opIterNext(&sIter))!=0 ){
int opcode = pOp->opcode;
if( opcode==OP_Destroy || opcode==OP_VUpdate || opcode==OP_VRename
|| opcode==OP_VDestroy
|| opcode==OP_VCreate
|| opcode==OP_ParseSchema
|| opcode==OP_Function || opcode==OP_PureFunc
|| ((opcode==OP_Halt || opcode==OP_HaltIfNull)
&& ((pOp->p1)!=SQLITE_OK && pOp->p2==OE_Abort))
){
hasAbort = 1;
break;
}
if( opcode==OP_CreateBtree && pOp->p3==BTREE_INTKEY ) hasCreateTable = 1;
if( mayAbort ){
/* hasCreateIndex may also be set for some DELETE statements that use
** OP_Clear. So this routine may end up returning true in the case
** where a "DELETE FROM tbl" has a statement-journal but does not
** require one. This is not so bad - it is an inefficiency, not a bug. */
if( opcode==OP_CreateBtree && pOp->p3==BTREE_BLOBKEY ) hasCreateIndex = 1;
if( opcode==OP_Clear ) hasCreateIndex = 1;
}
if( opcode==OP_InitCoroutine ) hasInitCoroutine = 1;
#ifndef SQLITE_OMIT_FOREIGN_KEY
if( opcode==OP_FkCounter && pOp->p1==0 && pOp->p2==1 ){
hasFkCounter = 1;
}
#endif
}
sqlite3DbFree(v->db, sIter.apSub);
/* Return true if hasAbort==mayAbort. Or if a malloc failure occurred.
** If malloc failed, then the while() loop above may not have iterated
** through all opcodes and hasAbort may be set incorrectly. Return
** true for this case to prevent the assert() in the callers frame
** from failing. */
return ( v->db->mallocFailed || hasAbort==mayAbort || hasFkCounter
|| (hasCreateTable && hasInitCoroutine) || hasCreateIndex
);
}
#endif /* SQLITE_DEBUG - the sqlite3AssertMayAbort() function */
#ifdef SQLITE_DEBUG
/*
** Increment the nWrite counter in the VDBE if the cursor is not an
** ephemeral cursor, or if the cursor argument is NULL.
*/
void sqlite3VdbeIncrWriteCounter(Vdbe *p, VdbeCursor *pC){
if( pC==0
|| (pC->eCurType!=CURTYPE_SORTER
&& pC->eCurType!=CURTYPE_PSEUDO
&& !pC->isEphemeral)
){
p->nWrite++;
}
}
#endif
#ifdef SQLITE_DEBUG
/*
** Assert if an Abort at this point in time might result in a corrupt
** database.
*/
void sqlite3VdbeAssertAbortable(Vdbe *p){
assert( p->nWrite==0 || p->usesStmtJournal );
}
#endif
/*
** This routine is called after all opcodes have been inserted. It loops
** through all the opcodes and fixes up some details.
**
** (1) For each jump instruction with a negative P2 value (a label)
** resolve the P2 value to an actual address.
**
** (2) Compute the maximum number of arguments used by any SQL function
** and store that value in *pMaxFuncArgs.
**
** (3) Update the Vdbe.readOnly and Vdbe.bIsReader flags to accurately
** indicate what the prepared statement actually does.
**
** (4) (discontinued)
**
** (5) Reclaim the memory allocated for storing labels.
**
** This routine will only function correctly if the mkopcodeh.tcl generator
** script numbers the opcodes correctly. Changes to this routine must be
** coordinated with changes to mkopcodeh.tcl.
*/
static void resolveP2Values(Vdbe *p, int *pMaxFuncArgs){
int nMaxArgs = *pMaxFuncArgs;
Op *pOp;
Parse *pParse = p->pParse;
int *aLabel = pParse->aLabel;
p->readOnly = 1;
p->bIsReader = 0;
pOp = &p->aOp[p->nOp-1];
assert( p->aOp[0].opcode==OP_Init );
while( 1 /* Loop termates when it reaches the OP_Init opcode */ ){
/* Only JUMP opcodes and the short list of special opcodes in the switch
** below need to be considered. The mkopcodeh.tcl generator script groups
** all these opcodes together near the front of the opcode list. Skip
** any opcode that does not need processing by virtual of the fact that
** it is larger than SQLITE_MX_JUMP_OPCODE, as a performance optimization.
*/
if( pOp->opcode<=SQLITE_MX_JUMP_OPCODE ){
/* NOTE: Be sure to update mkopcodeh.tcl when adding or removing
** cases from this switch! */
switch( pOp->opcode ){
case OP_Transaction: {
if( pOp->p2!=0 ) p->readOnly = 0;
/* no break */ deliberate_fall_through
}
case OP_AutoCommit:
case OP_Savepoint: {
p->bIsReader = 1;
break;
}
#ifndef SQLITE_OMIT_WAL
case OP_Checkpoint:
#endif
case OP_Vacuum:
case OP_JournalMode: {
p->readOnly = 0;
p->bIsReader = 1;
break;
}
case OP_Init: {
assert( pOp->p2>=0 );
goto resolve_p2_values_loop_exit;
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
case OP_VUpdate: {
if( pOp->p2>nMaxArgs ) nMaxArgs = pOp->p2;
break;
}
case OP_VFilter: {
int n;
assert( (pOp - p->aOp) >= 3 );
assert( pOp[-1].opcode==OP_Integer );
n = pOp[-1].p1;
if( n>nMaxArgs ) nMaxArgs = n;
/* Fall through into the default case */
/* no break */ deliberate_fall_through
}
#endif
default: {
if( pOp->p2<0 ){
/* The mkopcodeh.tcl script has so arranged things that the only
** non-jump opcodes less than SQLITE_MX_JUMP_CODE are guaranteed to
** have non-negative values for P2. */
assert( (sqlite3OpcodeProperty[pOp->opcode] & OPFLG_JUMP)!=0 );
assert( ADDR(pOp->p2)<-pParse->nLabel );
pOp->p2 = aLabel[ADDR(pOp->p2)];
}
break;
}
}
/* The mkopcodeh.tcl script has so arranged things that the only
** non-jump opcodes less than SQLITE_MX_JUMP_CODE are guaranteed to
** have non-negative values for P2. */
assert( (sqlite3OpcodeProperty[pOp->opcode]&OPFLG_JUMP)==0 || pOp->p2>=0);
}
assert( pOp>p->aOp );
pOp--;
}
resolve_p2_values_loop_exit:
if( aLabel ){
sqlite3DbNNFreeNN(p->db, pParse->aLabel);
pParse->aLabel = 0;
}
pParse->nLabel = 0;
*pMaxFuncArgs = nMaxArgs;
assert( p->bIsReader!=0 || DbMaskAllZero(p->btreeMask) );
}
#ifdef SQLITE_DEBUG
/*
** Check to see if a subroutine contains a jump to a location outside of
** the subroutine. If a jump outside the subroutine is detected, add code
** that will cause the program to halt with an error message.
**
** The subroutine consists of opcodes between iFirst and iLast. Jumps to
** locations within the subroutine are acceptable. iRetReg is a register
** that contains the return address. Jumps to outside the range of iFirst
** through iLast are also acceptable as long as the jump destination is
** an OP_Return to iReturnAddr.
**
** A jump to an unresolved label means that the jump destination will be
** beyond the current address. That is normally a jump to an early
** termination and is consider acceptable.
**
** This routine only runs during debug builds. The purpose is (of course)
** to detect invalid escapes out of a subroutine. The OP_Halt opcode
** is generated rather than an assert() or other error, so that ".eqp full"
** will still work to show the original bytecode, to aid in debugging.
*/
void sqlite3VdbeNoJumpsOutsideSubrtn(
Vdbe *v, /* The byte-code program under construction */
int iFirst, /* First opcode of the subroutine */
int iLast, /* Last opcode of the subroutine */
int iRetReg /* Subroutine return address register */
){
VdbeOp *pOp;
Parse *pParse;
int i;
sqlite3_str *pErr = 0;
assert( v!=0 );
pParse = v->pParse;
assert( pParse!=0 );
if( pParse->nErr ) return;
assert( iLast>=iFirst );
assert( iLast<v->nOp );
pOp = &v->aOp[iFirst];
for(i=iFirst; i<=iLast; i++, pOp++){
if( (sqlite3OpcodeProperty[pOp->opcode] & OPFLG_JUMP)!=0 ){
int iDest = pOp->p2; /* Jump destination */
if( iDest==0 ) continue;
if( pOp->opcode==OP_Gosub ) continue;
if( iDest<0 ){
int j = ADDR(iDest);
assert( j>=0 );
if( j>=-pParse->nLabel || pParse->aLabel[j]<0 ){
continue;
}
iDest = pParse->aLabel[j];
}
if( iDest<iFirst || iDest>iLast ){
int j = iDest;
for(; j<v->nOp; j++){
VdbeOp *pX = &v->aOp[j];
if( pX->opcode==OP_Return ){
if( pX->p1==iRetReg ) break;
continue;
}
if( pX->opcode==OP_Noop ) continue;
if( pX->opcode==OP_Explain ) continue;
if( pErr==0 ){
pErr = sqlite3_str_new(0);
}else{
sqlite3_str_appendchar(pErr, 1, '\n');
}
sqlite3_str_appendf(pErr,
"Opcode at %d jumps to %d which is outside the "
"subroutine at %d..%d",
i, iDest, iFirst, iLast);
break;
}
}
}
}
if( pErr ){
char *zErr = sqlite3_str_finish(pErr);
sqlite3VdbeAddOp4(v, OP_Halt, SQLITE_INTERNAL, OE_Abort, 0, zErr, 0);
sqlite3_free(zErr);
sqlite3MayAbort(pParse);
}
}
#endif /* SQLITE_DEBUG */
/*
** Return the address of the next instruction to be inserted.
*/
int sqlite3VdbeCurrentAddr(Vdbe *p){
assert( p->eVdbeState==VDBE_INIT_STATE );
return p->nOp;
}
/*
** Verify that at least N opcode slots are available in p without
** having to malloc for more space (except when compiled using
** SQLITE_TEST_REALLOC_STRESS). This interface is used during testing
** to verify that certain calls to sqlite3VdbeAddOpList() can never
** fail due to a OOM fault and hence that the return value from
** sqlite3VdbeAddOpList() will always be non-NULL.
*/
#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N){
assert( p->nOp + N <= p->nOpAlloc );
}
#endif
/*
** Verify that the VM passed as the only argument does not contain
** an OP_ResultRow opcode. Fail an assert() if it does. This is used
** by code in pragma.c to ensure that the implementation of certain
** pragmas comports with the flags specified in the mkpragmatab.tcl
** script.
*/
#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
void sqlite3VdbeVerifyNoResultRow(Vdbe *p){
int i;
for(i=0; i<p->nOp; i++){
assert( p->aOp[i].opcode!=OP_ResultRow );
}
}
#endif
/*
** Generate code (a single OP_Abortable opcode) that will
** verify that the VDBE program can safely call Abort in the current
** context.
*/
#if defined(SQLITE_DEBUG)
void sqlite3VdbeVerifyAbortable(Vdbe *p, int onError){
if( onError==OE_Abort ) sqlite3VdbeAddOp0(p, OP_Abortable);
}
#endif
/*
** This function returns a pointer to the array of opcodes associated with
** the Vdbe passed as the first argument. It is the callers responsibility
** to arrange for the returned array to be eventually freed using the
** vdbeFreeOpArray() function.
**
** Before returning, *pnOp is set to the number of entries in the returned
** array. Also, *pnMaxArg is set to the larger of its current value and
** the number of entries in the Vdbe.apArg[] array required to execute the
** returned program.
*/
VdbeOp *sqlite3VdbeTakeOpArray(Vdbe *p, int *pnOp, int *pnMaxArg){
VdbeOp *aOp = p->aOp;
assert( aOp && !p->db->mallocFailed );
/* Check that sqlite3VdbeUsesBtree() was not called on this VM */
assert( DbMaskAllZero(p->btreeMask) );
resolveP2Values(p, pnMaxArg);
*pnOp = p->nOp;
p->aOp = 0;
return aOp;
}
/*
** Add a whole list of operations to the operation stack. Return a
** pointer to the first operation inserted.
**
** Non-zero P2 arguments to jump instructions are automatically adjusted
** so that the jump target is relative to the first operation inserted.
*/
VdbeOp *sqlite3VdbeAddOpList(
Vdbe *p, /* Add opcodes to the prepared statement */
int nOp, /* Number of opcodes to add */
VdbeOpList const *aOp, /* The opcodes to be added */
int iLineno /* Source-file line number of first opcode */
){
int i;
VdbeOp *pOut, *pFirst;
assert( nOp>0 );
assert( p->eVdbeState==VDBE_INIT_STATE );
if( p->nOp + nOp > p->nOpAlloc && growOpArray(p, nOp) ){
return 0;
}
pFirst = pOut = &p->aOp[p->nOp];
for(i=0; i<nOp; i++, aOp++, pOut++){
pOut->opcode = aOp->opcode;
pOut->p1 = aOp->p1;
pOut->p2 = aOp->p2;
assert( aOp->p2>=0 );
if( (sqlite3OpcodeProperty[aOp->opcode] & OPFLG_JUMP)!=0 && aOp->p2>0 ){
pOut->p2 += p->nOp;
}
pOut->p3 = aOp->p3;
pOut->p4type = P4_NOTUSED;
pOut->p4.p = 0;
pOut->p5 = 0;
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
pOut->zComment = 0;
#endif
#ifdef SQLITE_VDBE_COVERAGE
pOut->iSrcLine = iLineno+i;
#else
(void)iLineno;
#endif
#ifdef SQLITE_DEBUG
if( p->db->flags & SQLITE_VdbeAddopTrace ){
sqlite3VdbePrintOp(0, i+p->nOp, &p->aOp[i+p->nOp]);
}
#endif
}
p->nOp += nOp;
return pFirst;
}
#if defined(SQLITE_ENABLE_STMT_SCANSTATUS)
/*
** Add an entry to the array of counters managed by sqlite3_stmt_scanstatus().
*/
void sqlite3VdbeScanStatus(
Vdbe *p, /* VM to add scanstatus() to */
int addrExplain, /* Address of OP_Explain (or 0) */
int addrLoop, /* Address of loop counter */
int addrVisit, /* Address of rows visited counter */
LogEst nEst, /* Estimated number of output rows */
const char *zName /* Name of table or index being scanned */
){
sqlite3_int64 nByte = (p->nScan+1) * sizeof(ScanStatus);
ScanStatus *aNew;
aNew = (ScanStatus*)sqlite3DbRealloc(p->db, p->aScan, nByte);
if( aNew ){
ScanStatus *pNew = &aNew[p->nScan++];
pNew->addrExplain = addrExplain;
pNew->addrLoop = addrLoop;
pNew->addrVisit = addrVisit;
pNew->nEst = nEst;
pNew->zName = sqlite3DbStrDup(p->db, zName);
p->aScan = aNew;
}
}
#endif
/*
** Change the value of the opcode, or P1, P2, P3, or P5 operands
** for a specific instruction.
*/
void sqlite3VdbeChangeOpcode(Vdbe *p, int addr, u8 iNewOpcode){
assert( addr>=0 );
sqlite3VdbeGetOp(p,addr)->opcode = iNewOpcode;
}
void sqlite3VdbeChangeP1(Vdbe *p, int addr, int val){
assert( addr>=0 );
sqlite3VdbeGetOp(p,addr)->p1 = val;
}
void sqlite3VdbeChangeP2(Vdbe *p, int addr, int val){
assert( addr>=0 || p->db->mallocFailed );
sqlite3VdbeGetOp(p,addr)->p2 = val;
}
void sqlite3VdbeChangeP3(Vdbe *p, int addr, int val){
assert( addr>=0 );
sqlite3VdbeGetOp(p,addr)->p3 = val;
}
void sqlite3VdbeChangeP5(Vdbe *p, u16 p5){
assert( p->nOp>0 || p->db->mallocFailed );
if( p->nOp>0 ) p->aOp[p->nOp-1].p5 = p5;
}
/*
** If the previous opcode is an OP_Column that delivers results
** into register iDest, then add the OPFLAG_TYPEOFARG flag to that
** opcode.
*/
void sqlite3VdbeTypeofColumn(Vdbe *p, int iDest){
VdbeOp *pOp = sqlite3VdbeGetLastOp(p);
if( pOp->p3==iDest && pOp->opcode==OP_Column ){
pOp->p5 |= OPFLAG_TYPEOFARG;
}
}
/*
** Change the P2 operand of instruction addr so that it points to
** the address of the next instruction to be coded.
*/
void sqlite3VdbeJumpHere(Vdbe *p, int addr){
sqlite3VdbeChangeP2(p, addr, p->nOp);
}
/*
** Change the P2 operand of the jump instruction at addr so that
** the jump lands on the next opcode. Or if the jump instruction was
** the previous opcode (and is thus a no-op) then simply back up
** the next instruction counter by one slot so that the jump is
** overwritten by the next inserted opcode.
**
** This routine is an optimization of sqlite3VdbeJumpHere() that
** strives to omit useless byte-code like this:
**
** 7 Once 0 8 0
** 8 ...
*/
void sqlite3VdbeJumpHereOrPopInst(Vdbe *p, int addr){
if( addr==p->nOp-1 ){
assert( p->aOp[addr].opcode==OP_Once
|| p->aOp[addr].opcode==OP_If
|| p->aOp[addr].opcode==OP_FkIfZero );
assert( p->aOp[addr].p4type==0 );
#ifdef SQLITE_VDBE_COVERAGE
sqlite3VdbeGetLastOp(p)->iSrcLine = 0; /* Erase VdbeCoverage() macros */
#endif
p->nOp--;
}else{
sqlite3VdbeChangeP2(p, addr, p->nOp);
}
}
/*
** If the input FuncDef structure is ephemeral, then free it. If
** the FuncDef is not ephermal, then do nothing.
*/
static void freeEphemeralFunction(sqlite3 *db, FuncDef *pDef){
assert( db!=0 );
if( (pDef->funcFlags & SQLITE_FUNC_EPHEM)!=0 ){
sqlite3DbNNFreeNN(db, pDef);
}
}
/*
** Delete a P4 value if necessary.
*/
static SQLITE_NOINLINE void freeP4Mem(sqlite3 *db, Mem *p){
if( p->szMalloc ) sqlite3DbFree(db, p->zMalloc);
sqlite3DbNNFreeNN(db, p);
}
static SQLITE_NOINLINE void freeP4FuncCtx(sqlite3 *db, sqlite3_context *p){
assert( db!=0 );
freeEphemeralFunction(db, p->pFunc);
sqlite3DbNNFreeNN(db, p);
}
static void freeP4(sqlite3 *db, int p4type, void *p4){
assert( db );
switch( p4type ){
case P4_FUNCCTX: {
freeP4FuncCtx(db, (sqlite3_context*)p4);
break;
}
case P4_REAL:
case P4_INT64:
case P4_DYNAMIC:
case P4_INTARRAY: {
if( p4 ) sqlite3DbNNFreeNN(db, p4);
break;
}
case P4_KEYINFO: {
if( db->pnBytesFreed==0 ) sqlite3KeyInfoUnref((KeyInfo*)p4);
break;
}
#ifdef SQLITE_ENABLE_CURSOR_HINTS
case P4_EXPR: {
sqlite3ExprDelete(db, (Expr*)p4);
break;
}
#endif
case P4_FUNCDEF: {
freeEphemeralFunction(db, (FuncDef*)p4);
break;
}
case P4_MEM: {
if( db->pnBytesFreed==0 ){
sqlite3ValueFree((sqlite3_value*)p4);
}else{
freeP4Mem(db, (Mem*)p4);
}
break;
}
case P4_VTAB : {
if( db->pnBytesFreed==0 ) sqlite3VtabUnlock((VTable *)p4);
break;
}
}
}
/*
** Free the space allocated for aOp and any p4 values allocated for the
** opcodes contained within. If aOp is not NULL it is assumed to contain
** nOp entries.
*/
static void vdbeFreeOpArray(sqlite3 *db, Op *aOp, int nOp){
assert( nOp>=0 );
assert( db!=0 );
if( aOp ){
Op *pOp = &aOp[nOp-1];
while(1){ /* Exit via break */
if( pOp->p4type <= P4_FREE_IF_LE ) freeP4(db, pOp->p4type, pOp->p4.p);
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
sqlite3DbFree(db, pOp->zComment);
#endif
if( pOp==aOp ) break;
pOp--;
}
sqlite3DbNNFreeNN(db, aOp);
}
}
/*
** Link the SubProgram object passed as the second argument into the linked
** list at Vdbe.pSubProgram. This list is used to delete all sub-program
** objects when the VM is no longer required.
*/
void sqlite3VdbeLinkSubProgram(Vdbe *pVdbe, SubProgram *p){
p->pNext = pVdbe->pProgram;
pVdbe->pProgram = p;
}
/*
** Return true if the given Vdbe has any SubPrograms.
*/
int sqlite3VdbeHasSubProgram(Vdbe *pVdbe){
return pVdbe->pProgram!=0;
}
/*
** Change the opcode at addr into OP_Noop
*/
int sqlite3VdbeChangeToNoop(Vdbe *p, int addr){
VdbeOp *pOp;
if( p->db->mallocFailed ) return 0;
assert( addr>=0 && addr<p->nOp );
pOp = &p->aOp[addr];
freeP4(p->db, pOp->p4type, pOp->p4.p);
pOp->p4type = P4_NOTUSED;
pOp->p4.z = 0;
pOp->opcode = OP_Noop;
return 1;
}
/*
** If the last opcode is "op" and it is not a jump destination,
** then remove it. Return true if and only if an opcode was removed.
*/
int sqlite3VdbeDeletePriorOpcode(Vdbe *p, u8 op){
if( p->nOp>0 && p->aOp[p->nOp-1].opcode==op ){
return sqlite3VdbeChangeToNoop(p, p->nOp-1);
}else{
return 0;
}
}
#ifdef SQLITE_DEBUG
/*
** Generate an OP_ReleaseReg opcode to indicate that a range of
** registers, except any identified by mask, are no longer in use.
*/
void sqlite3VdbeReleaseRegisters(
Parse *pParse, /* Parsing context */
int iFirst, /* Index of first register to be released */
int N, /* Number of registers to release */
u32 mask, /* Mask of registers to NOT release */
int bUndefine /* If true, mark registers as undefined */
){
if( N==0 || OptimizationDisabled(pParse->db, SQLITE_ReleaseReg) ) return;
assert( pParse->pVdbe );
assert( iFirst>=1 );
assert( iFirst+N-1<=pParse->nMem );
if( N<=31 && mask!=0 ){
while( N>0 && (mask&1)!=0 ){
mask >>= 1;
iFirst++;
N--;
}
while( N>0 && N<=32 && (mask & MASKBIT32(N-1))!=0 ){
mask &= ~MASKBIT32(N-1);
N--;
}
}
if( N>0 ){
sqlite3VdbeAddOp3(pParse->pVdbe, OP_ReleaseReg, iFirst, N, *(int*)&mask);
if( bUndefine ) sqlite3VdbeChangeP5(pParse->pVdbe, 1);
}
}
#endif /* SQLITE_DEBUG */
/*
** Change the value of the P4 operand for a specific instruction.
** This routine is useful when a large program is loaded from a
** static array using sqlite3VdbeAddOpList but we want to make a
** few minor changes to the program.
**
** If n>=0 then the P4 operand is dynamic, meaning that a copy of
** the string is made into memory obtained from sqlite3_malloc().
** A value of n==0 means copy bytes of zP4 up to and including the
** first null byte. If n>0 then copy n+1 bytes of zP4.
**
** Other values of n (P4_STATIC, P4_COLLSEQ etc.) indicate that zP4 points
** to a string or structure that is guaranteed to exist for the lifetime of
** the Vdbe. In these cases we can just copy the pointer.
**
** If addr<0 then change P4 on the most recently inserted instruction.
*/
static void SQLITE_NOINLINE vdbeChangeP4Full(
Vdbe *p,
Op *pOp,
const char *zP4,
int n
){
if( pOp->p4type ){
freeP4(p->db, pOp->p4type, pOp->p4.p);
pOp->p4type = 0;
pOp->p4.p = 0;
}
if( n<0 ){
sqlite3VdbeChangeP4(p, (int)(pOp - p->aOp), zP4, n);
}else{
if( n==0 ) n = sqlite3Strlen30(zP4);
pOp->p4.z = sqlite3DbStrNDup(p->db, zP4, n);
pOp->p4type = P4_DYNAMIC;
}
}
void sqlite3VdbeChangeP4(Vdbe *p, int addr, const char *zP4, int n){
Op *pOp;
sqlite3 *db;
assert( p!=0 );
db = p->db;
assert( p->eVdbeState==VDBE_INIT_STATE );
assert( p->aOp!=0 || db->mallocFailed );
if( db->mallocFailed ){
if( n!=P4_VTAB ) freeP4(db, n, (void*)*(char**)&zP4);
return;
}
assert( p->nOp>0 );
assert( addr<p->nOp );
if( addr<0 ){
addr = p->nOp - 1;
}
pOp = &p->aOp[addr];
if( n>=0 || pOp->p4type ){
vdbeChangeP4Full(p, pOp, zP4, n);
return;
}
if( n==P4_INT32 ){
/* Note: this cast is safe, because the origin data point was an int
** that was cast to a (const char *). */
pOp->p4.i = SQLITE_PTR_TO_INT(zP4);
pOp->p4type = P4_INT32;
}else if( zP4!=0 ){
assert( n<0 );
pOp->p4.p = (void*)zP4;
pOp->p4type = (signed char)n;
if( n==P4_VTAB ) sqlite3VtabLock((VTable*)zP4);
}
}
/*
** Change the P4 operand of the most recently coded instruction
** to the value defined by the arguments. This is a high-speed
** version of sqlite3VdbeChangeP4().
**
** The P4 operand must not have been previously defined. And the new
** P4 must not be P4_INT32. Use sqlite3VdbeChangeP4() in either of
** those cases.
*/
void sqlite3VdbeAppendP4(Vdbe *p, void *pP4, int n){
VdbeOp *pOp;
assert( n!=P4_INT32 && n!=P4_VTAB );
assert( n<=0 );
if( p->db->mallocFailed ){
freeP4(p->db, n, pP4);
}else{
assert( pP4!=0 );
assert( p->nOp>0 );
pOp = &p->aOp[p->nOp-1];
assert( pOp->p4type==P4_NOTUSED );
pOp->p4type = n;
pOp->p4.p = pP4;
}
}
/*
** Set the P4 on the most recently added opcode to the KeyInfo for the
** index given.
*/
void sqlite3VdbeSetP4KeyInfo(Parse *pParse, Index *pIdx){
Vdbe *v = pParse->pVdbe;
KeyInfo *pKeyInfo;
assert( v!=0 );
assert( pIdx!=0 );
pKeyInfo = sqlite3KeyInfoOfIndex(pParse, pIdx);
if( pKeyInfo ) sqlite3VdbeAppendP4(v, pKeyInfo, P4_KEYINFO);
}
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
/*
** Change the comment on the most recently coded instruction. Or
** insert a No-op and add the comment to that new instruction. This
** makes the code easier to read during debugging. None of this happens
** in a production build.
*/
static void vdbeVComment(Vdbe *p, const char *zFormat, va_list ap){
assert( p->nOp>0 || p->aOp==0 );
assert( p->aOp==0 || p->aOp[p->nOp-1].zComment==0 || p->pParse->nErr>0 );
if( p->nOp ){
assert( p->aOp );
sqlite3DbFree(p->db, p->aOp[p->nOp-1].zComment);
p->aOp[p->nOp-1].zComment = sqlite3VMPrintf(p->db, zFormat, ap);
}
}
void sqlite3VdbeComment(Vdbe *p, const char *zFormat, ...){
va_list ap;
if( p ){
va_start(ap, zFormat);
vdbeVComment(p, zFormat, ap);
va_end(ap);
}
}
void sqlite3VdbeNoopComment(Vdbe *p, const char *zFormat, ...){
va_list ap;
if( p ){
sqlite3VdbeAddOp0(p, OP_Noop);
va_start(ap, zFormat);
vdbeVComment(p, zFormat, ap);
va_end(ap);
}
}
#endif /* NDEBUG */
#ifdef SQLITE_VDBE_COVERAGE
/*
** Set the value if the iSrcLine field for the previously coded instruction.
*/
void sqlite3VdbeSetLineNumber(Vdbe *v, int iLine){
sqlite3VdbeGetLastOp(v)->iSrcLine = iLine;
}
#endif /* SQLITE_VDBE_COVERAGE */
/*
** Return the opcode for a given address. The address must be non-negative.
** See sqlite3VdbeGetLastOp() to get the most recently added opcode.
**
** If a memory allocation error has occurred prior to the calling of this
** routine, then a pointer to a dummy VdbeOp will be returned. That opcode
** is readable but not writable, though it is cast to a writable value.
** The return of a dummy opcode allows the call to continue functioning
** after an OOM fault without having to check to see if the return from
** this routine is a valid pointer. But because the dummy.opcode is 0,
** dummy will never be written to. This is verified by code inspection and
** by running with Valgrind.
*/
VdbeOp *sqlite3VdbeGetOp(Vdbe *p, int addr){
/* C89 specifies that the constant "dummy" will be initialized to all
** zeros, which is correct. MSVC generates a warning, nevertheless. */
static VdbeOp dummy; /* Ignore the MSVC warning about no initializer */
assert( p->eVdbeState==VDBE_INIT_STATE );
assert( (addr>=0 && addr<p->nOp) || p->db->mallocFailed );
if( p->db->mallocFailed ){
return (VdbeOp*)&dummy;
}else{
return &p->aOp[addr];
}
}
/* Return the most recently added opcode
*/
VdbeOp * sqlite3VdbeGetLastOp(Vdbe *p){
return sqlite3VdbeGetOp(p, p->nOp - 1);
}
#if defined(SQLITE_ENABLE_EXPLAIN_COMMENTS)
/*
** Return an integer value for one of the parameters to the opcode pOp
** determined by character c.
*/
static int translateP(char c, const Op *pOp){
if( c=='1' ) return pOp->p1;
if( c=='2' ) return pOp->p2;
if( c=='3' ) return pOp->p3;
if( c=='4' ) return pOp->p4.i;
return pOp->p5;
}
/*
** Compute a string for the "comment" field of a VDBE opcode listing.
**
** The Synopsis: field in comments in the vdbe.c source file gets converted
** to an extra string that is appended to the sqlite3OpcodeName(). In the
** absence of other comments, this synopsis becomes the comment on the opcode.
** Some translation occurs:
**
** "PX" -> "r[X]"
** "PX@PY" -> "r[X..X+Y-1]" or "r[x]" if y is 0 or 1
** "PX@PY+1" -> "r[X..X+Y]" or "r[x]" if y is 0
** "PY..PY" -> "r[X..Y]" or "r[x]" if y<=x
*/
char *sqlite3VdbeDisplayComment(
sqlite3 *db, /* Optional - Oom error reporting only */
const Op *pOp, /* The opcode to be commented */
const char *zP4 /* Previously obtained value for P4 */
){
const char *zOpName;
const char *zSynopsis;
int nOpName;
int ii;
char zAlt[50];
StrAccum x;
sqlite3StrAccumInit(&x, 0, 0, 0, SQLITE_MAX_LENGTH);
zOpName = sqlite3OpcodeName(pOp->opcode);
nOpName = sqlite3Strlen30(zOpName);
if( zOpName[nOpName+1] ){
int seenCom = 0;
char c;
zSynopsis = zOpName + nOpName + 1;
if( strncmp(zSynopsis,"IF ",3)==0 ){
sqlite3_snprintf(sizeof(zAlt), zAlt, "if %s goto P2", zSynopsis+3);
zSynopsis = zAlt;
}
for(ii=0; (c = zSynopsis[ii])!=0; ii++){
if( c=='P' ){
c = zSynopsis[++ii];
if( c=='4' ){
sqlite3_str_appendall(&x, zP4);
}else if( c=='X' ){
if( pOp->zComment && pOp->zComment[0] ){
sqlite3_str_appendall(&x, pOp->zComment);
seenCom = 1;
break;
}
}else{
int v1 = translateP(c, pOp);
int v2;
if( strncmp(zSynopsis+ii+1, "@P", 2)==0 ){
ii += 3;
v2 = translateP(zSynopsis[ii], pOp);
if( strncmp(zSynopsis+ii+1,"+1",2)==0 ){
ii += 2;
v2++;
}
if( v2<2 ){
sqlite3_str_appendf(&x, "%d", v1);
}else{
sqlite3_str_appendf(&x, "%d..%d", v1, v1+v2-1);
}
}else if( strncmp(zSynopsis+ii+1, "@NP", 3)==0 ){
sqlite3_context *pCtx = pOp->p4.pCtx;
if( pOp->p4type!=P4_FUNCCTX || pCtx->argc==1 ){
sqlite3_str_appendf(&x, "%d", v1);
}else if( pCtx->argc>1 ){
sqlite3_str_appendf(&x, "%d..%d", v1, v1+pCtx->argc-1);
}else if( x.accError==0 ){
assert( x.nChar>2 );
x.nChar -= 2;
ii++;
}
ii += 3;
}else{
sqlite3_str_appendf(&x, "%d", v1);
if( strncmp(zSynopsis+ii+1, "..P3", 4)==0 && pOp->p3==0 ){
ii += 4;
}
}
}
}else{
sqlite3_str_appendchar(&x, 1, c);
}
}
if( !seenCom && pOp->zComment ){
sqlite3_str_appendf(&x, "; %s", pOp->zComment);
}
}else if( pOp->zComment ){
sqlite3_str_appendall(&x, pOp->zComment);
}
if( (x.accError & SQLITE_NOMEM)!=0 && db!=0 ){
sqlite3OomFault(db);
}
return sqlite3StrAccumFinish(&x);
}
#endif /* SQLITE_ENABLE_EXPLAIN_COMMENTS */
#if VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS)
/*
** Translate the P4.pExpr value for an OP_CursorHint opcode into text
** that can be displayed in the P4 column of EXPLAIN output.
*/
static void displayP4Expr(StrAccum *p, Expr *pExpr){
const char *zOp = 0;
switch( pExpr->op ){
case TK_STRING:
assert( !ExprHasProperty(pExpr, EP_IntValue) );
sqlite3_str_appendf(p, "%Q", pExpr->u.zToken);
break;
case TK_INTEGER:
sqlite3_str_appendf(p, "%d", pExpr->u.iValue);
break;
case TK_NULL:
sqlite3_str_appendf(p, "NULL");
break;
case TK_REGISTER: {
sqlite3_str_appendf(p, "r[%d]", pExpr->iTable);
break;
}
case TK_COLUMN: {
if( pExpr->iColumn<0 ){
sqlite3_str_appendf(p, "rowid");
}else{
sqlite3_str_appendf(p, "c%d", (int)pExpr->iColumn);
}
break;
}
case TK_LT: zOp = "LT"; break;
case TK_LE: zOp = "LE"; break;
case TK_GT: zOp = "GT"; break;
case TK_GE: zOp = "GE"; break;
case TK_NE: zOp = "NE"; break;
case TK_EQ: zOp = "EQ"; break;
case TK_IS: zOp = "IS"; break;
case TK_ISNOT: zOp = "ISNOT"; break;
case TK_AND: zOp = "AND"; break;
case TK_OR: zOp = "OR"; break;
case TK_PLUS: zOp = "ADD"; break;
case TK_STAR: zOp = "MUL"; break;
case TK_MINUS: zOp = "SUB"; break;
case TK_REM: zOp = "REM"; break;
case TK_BITAND: zOp = "BITAND"; break;
case TK_BITOR: zOp = "BITOR"; break;
case TK_SLASH: zOp = "DIV"; break;
case TK_LSHIFT: zOp = "LSHIFT"; break;
case TK_RSHIFT: zOp = "RSHIFT"; break;
case TK_CONCAT: zOp = "CONCAT"; break;
case TK_UMINUS: zOp = "MINUS"; break;
case TK_UPLUS: zOp = "PLUS"; break;
case TK_BITNOT: zOp = "BITNOT"; break;
case TK_NOT: zOp = "NOT"; break;
case TK_ISNULL: zOp = "ISNULL"; break;
case TK_NOTNULL: zOp = "NOTNULL"; break;
default:
sqlite3_str_appendf(p, "%s", "expr");
break;
}
if( zOp ){
sqlite3_str_appendf(p, "%s(", zOp);
displayP4Expr(p, pExpr->pLeft);
if( pExpr->pRight ){
sqlite3_str_append(p, ",", 1);
displayP4Expr(p, pExpr->pRight);
}
sqlite3_str_append(p, ")", 1);
}
}
#endif /* VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS) */
#if VDBE_DISPLAY_P4
/*
** Compute a string that describes the P4 parameter for an opcode.
** Use zTemp for any required temporary buffer space.
*/
char *sqlite3VdbeDisplayP4(sqlite3 *db, Op *pOp){
char *zP4 = 0;
StrAccum x;
sqlite3StrAccumInit(&x, 0, 0, 0, SQLITE_MAX_LENGTH);
switch( pOp->p4type ){
case P4_KEYINFO: {
int j;
KeyInfo *pKeyInfo = pOp->p4.pKeyInfo;
assert( pKeyInfo->aSortFlags!=0 );
sqlite3_str_appendf(&x, "k(%d", pKeyInfo->nKeyField);
for(j=0; j<pKeyInfo->nKeyField; j++){
CollSeq *pColl = pKeyInfo->aColl[j];
const char *zColl = pColl ? pColl->zName : "";
if( strcmp(zColl, "BINARY")==0 ) zColl = "B";
sqlite3_str_appendf(&x, ",%s%s%s",
(pKeyInfo->aSortFlags[j] & KEYINFO_ORDER_DESC) ? "-" : "",
(pKeyInfo->aSortFlags[j] & KEYINFO_ORDER_BIGNULL)? "N." : "",
zColl);
}
sqlite3_str_append(&x, ")", 1);
break;
}
#ifdef SQLITE_ENABLE_CURSOR_HINTS
case P4_EXPR: {
displayP4Expr(&x, pOp->p4.pExpr);
break;
}
#endif
case P4_COLLSEQ: {
static const char *const encnames[] = {"?", "8", "16LE", "16BE"};
CollSeq *pColl = pOp->p4.pColl;
assert( pColl->enc<4 );
sqlite3_str_appendf(&x, "%.18s-%s", pColl->zName,
encnames[pColl->enc]);
break;
}
case P4_FUNCDEF: {
FuncDef *pDef = pOp->p4.pFunc;
sqlite3_str_appendf(&x, "%s(%d)", pDef->zName, pDef->nArg);
break;
}
case P4_FUNCCTX: {
FuncDef *pDef = pOp->p4.pCtx->pFunc;
sqlite3_str_appendf(&x, "%s(%d)", pDef->zName, pDef->nArg);
break;
}
case P4_INT64: {
sqlite3_str_appendf(&x, "%lld", *pOp->p4.pI64);
break;
}
case P4_INT32: {
sqlite3_str_appendf(&x, "%d", pOp->p4.i);
break;
}
case P4_REAL: {
sqlite3_str_appendf(&x, "%.16g", *pOp->p4.pReal);
break;
}
case P4_MEM: {
Mem *pMem = pOp->p4.pMem;
if( pMem->flags & MEM_Str ){
zP4 = pMem->z;
}else if( pMem->flags & (MEM_Int|MEM_IntReal) ){
sqlite3_str_appendf(&x, "%lld", pMem->u.i);
}else if( pMem->flags & MEM_Real ){
sqlite3_str_appendf(&x, "%.16g", pMem->u.r);
}else if( pMem->flags & MEM_Null ){
zP4 = "NULL";
}else{
assert( pMem->flags & MEM_Blob );
zP4 = "(blob)";
}
break;
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
case P4_VTAB: {
sqlite3_vtab *pVtab = pOp->p4.pVtab->pVtab;
sqlite3_str_appendf(&x, "vtab:%p", pVtab);
break;
}
#endif
case P4_INTARRAY: {
u32 i;
u32 *ai = pOp->p4.ai;
u32 n = ai[0]; /* The first element of an INTARRAY is always the
** count of the number of elements to follow */
for(i=1; i<=n; i++){
sqlite3_str_appendf(&x, "%c%u", (i==1 ? '[' : ','), ai[i]);
}
sqlite3_str_append(&x, "]", 1);
break;
}
case P4_SUBPROGRAM: {
zP4 = "program";
break;
}
case P4_TABLE: {
zP4 = pOp->p4.pTab->zName;
break;
}
default: {
zP4 = pOp->p4.z;
}
}
if( zP4 ) sqlite3_str_appendall(&x, zP4);
if( (x.accError & SQLITE_NOMEM)!=0 ){
sqlite3OomFault(db);
}
return sqlite3StrAccumFinish(&x);
}
#endif /* VDBE_DISPLAY_P4 */
/*
** Declare to the Vdbe that the BTree object at db->aDb[i] is used.
**
** The prepared statements need to know in advance the complete set of
** attached databases that will be use. A mask of these databases
** is maintained in p->btreeMask. The p->lockMask value is the subset of
** p->btreeMask of databases that will require a lock.
*/
void sqlite3VdbeUsesBtree(Vdbe *p, int i){
assert( i>=0 && i<p->db->nDb && i<(int)sizeof(yDbMask)*8 );
assert( i<(int)sizeof(p->btreeMask)*8 );
DbMaskSet(p->btreeMask, i);
if( i!=1 && sqlite3BtreeSharable(p->db->aDb[i].pBt) ){
DbMaskSet(p->lockMask, i);
}
}
#if !defined(SQLITE_OMIT_SHARED_CACHE)
/*
** If SQLite is compiled to support shared-cache mode and to be threadsafe,
** this routine obtains the mutex associated with each BtShared structure
** that may be accessed by the VM passed as an argument. In doing so it also
** sets the BtShared.db member of each of the BtShared structures, ensuring
** that the correct busy-handler callback is invoked if required.
**
** If SQLite is not threadsafe but does support shared-cache mode, then
** sqlite3BtreeEnter() is invoked to set the BtShared.db variables
** of all of BtShared structures accessible via the database handle
** associated with the VM.
**
** If SQLite is not threadsafe and does not support shared-cache mode, this
** function is a no-op.
**
** The p->btreeMask field is a bitmask of all btrees that the prepared
** statement p will ever use. Let N be the number of bits in p->btreeMask
** corresponding to btrees that use shared cache. Then the runtime of
** this routine is N*N. But as N is rarely more than 1, this should not
** be a problem.
*/
void sqlite3VdbeEnter(Vdbe *p){
int i;
sqlite3 *db;
Db *aDb;
int nDb;
if( DbMaskAllZero(p->lockMask) ) return; /* The common case */
db = p->db;
aDb = db->aDb;
nDb = db->nDb;
for(i=0; i<nDb; i++){
if( i!=1 && DbMaskTest(p->lockMask,i) && ALWAYS(aDb[i].pBt!=0) ){
sqlite3BtreeEnter(aDb[i].pBt);
}
}
}
#endif
#if !defined(SQLITE_OMIT_SHARED_CACHE) && SQLITE_THREADSAFE>0
/*
** Unlock all of the btrees previously locked by a call to sqlite3VdbeEnter().
*/
static SQLITE_NOINLINE void vdbeLeave(Vdbe *p){
int i;
sqlite3 *db;
Db *aDb;
int nDb;
db = p->db;
aDb = db->aDb;
nDb = db->nDb;
for(i=0; i<nDb; i++){
if( i!=1 && DbMaskTest(p->lockMask,i) && ALWAYS(aDb[i].pBt!=0) ){
sqlite3BtreeLeave(aDb[i].pBt);
}
}
}
void sqlite3VdbeLeave(Vdbe *p){
if( DbMaskAllZero(p->lockMask) ) return; /* The common case */
vdbeLeave(p);
}
#endif
#if defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
/*
** Print a single opcode. This routine is used for debugging only.
*/
void sqlite3VdbePrintOp(FILE *pOut, int pc, VdbeOp *pOp){
char *zP4;
char *zCom;
sqlite3 dummyDb;
static const char *zFormat1 = "%4d %-13s %4d %4d %4d %-13s %.2X %s\n";
if( pOut==0 ) pOut = stdout;
sqlite3BeginBenignMalloc();
dummyDb.mallocFailed = 1;
zP4 = sqlite3VdbeDisplayP4(&dummyDb, pOp);
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
zCom = sqlite3VdbeDisplayComment(0, pOp, zP4);
#else
zCom = 0;
#endif
/* NB: The sqlite3OpcodeName() function is implemented by code created
** by the mkopcodeh.awk and mkopcodec.awk scripts which extract the
** information from the vdbe.c source text */
fprintf(pOut, zFormat1, pc,
sqlite3OpcodeName(pOp->opcode), pOp->p1, pOp->p2, pOp->p3,
zP4 ? zP4 : "", pOp->p5,
zCom ? zCom : ""
);
fflush(pOut);
sqlite3_free(zP4);
sqlite3_free(zCom);
sqlite3EndBenignMalloc();
}
#endif
/*
** Initialize an array of N Mem element.
**
** This is a high-runner, so only those fields that really do need to
** be initialized are set. The Mem structure is organized so that
** the fields that get initialized are nearby and hopefully on the same
** cache line.
**
** Mem.flags = flags
** Mem.db = db
** Mem.szMalloc = 0
**
** All other fields of Mem can safely remain uninitialized for now. They
** will be initialized before use.
*/
static void initMemArray(Mem *p, int N, sqlite3 *db, u16 flags){
if( N>0 ){
do{
p->flags = flags;
p->db = db;
p->szMalloc = 0;
#ifdef SQLITE_DEBUG
p->pScopyFrom = 0;
#endif
p++;
}while( (--N)>0 );
}
}
/*
** Release auxiliary memory held in an array of N Mem elements.
**
** After this routine returns, all Mem elements in the array will still
** be valid. Those Mem elements that were not holding auxiliary resources
** will be unchanged. Mem elements which had something freed will be
** set to MEM_Undefined.
*/
static void releaseMemArray(Mem *p, int N){
if( p && N ){
Mem *pEnd = &p[N];
sqlite3 *db = p->db;
if( db->pnBytesFreed ){
do{
if( p->szMalloc ) sqlite3DbFree(db, p->zMalloc);
}while( (++p)<pEnd );
return;
}
do{
assert( (&p[1])==pEnd || p[0].db==p[1].db );
assert( sqlite3VdbeCheckMemInvariants(p) );
/* This block is really an inlined version of sqlite3VdbeMemRelease()
** that takes advantage of the fact that the memory cell value is
** being set to NULL after releasing any dynamic resources.
**
** The justification for duplicating code is that according to
** callgrind, this causes a certain test case to hit the CPU 4.7
** percent less (x86 linux, gcc version 4.1.2, -O6) than if
** sqlite3MemRelease() were called from here. With -O2, this jumps
** to 6.6 percent. The test case is inserting 1000 rows into a table
** with no indexes using a single prepared INSERT statement, bind()
** and reset(). Inserts are grouped into a transaction.
*/
testcase( p->flags & MEM_Agg );
testcase( p->flags & MEM_Dyn );
if( p->flags&(MEM_Agg|MEM_Dyn) ){
testcase( (p->flags & MEM_Dyn)!=0 && p->xDel==sqlite3VdbeFrameMemDel );
sqlite3VdbeMemRelease(p);
p->flags = MEM_Undefined;
}else if( p->szMalloc ){
sqlite3DbNNFreeNN(db, p->zMalloc);
p->szMalloc = 0;
p->flags = MEM_Undefined;
}
#ifdef SQLITE_DEBUG
else{
p->flags = MEM_Undefined;
}
#endif
}while( (++p)<pEnd );
}
}
#ifdef SQLITE_DEBUG
/*
** Verify that pFrame is a valid VdbeFrame pointer. Return true if it is
** and false if something is wrong.
**
** This routine is intended for use inside of assert() statements only.
*/
int sqlite3VdbeFrameIsValid(VdbeFrame *pFrame){
if( pFrame->iFrameMagic!=SQLITE_FRAME_MAGIC ) return 0;
return 1;
}
#endif
/*
** This is a destructor on a Mem object (which is really an sqlite3_value)
** that deletes the Frame object that is attached to it as a blob.
**
** This routine does not delete the Frame right away. It merely adds the
** frame to a list of frames to be deleted when the Vdbe halts.
*/
void sqlite3VdbeFrameMemDel(void *pArg){
VdbeFrame *pFrame = (VdbeFrame*)pArg;
assert( sqlite3VdbeFrameIsValid(pFrame) );
pFrame->pParent = pFrame->v->pDelFrame;
pFrame->v->pDelFrame = pFrame;
}
#if defined(SQLITE_ENABLE_BYTECODE_VTAB) || !defined(SQLITE_OMIT_EXPLAIN)
/*
** Locate the next opcode to be displayed in EXPLAIN or EXPLAIN
** QUERY PLAN output.
**
** Return SQLITE_ROW on success. Return SQLITE_DONE if there are no
** more opcodes to be displayed.
*/
int sqlite3VdbeNextOpcode(
Vdbe *p, /* The statement being explained */
Mem *pSub, /* Storage for keeping track of subprogram nesting */
int eMode, /* 0: normal. 1: EQP. 2: TablesUsed */
int *piPc, /* IN/OUT: Current rowid. Overwritten with next rowid */
int *piAddr, /* OUT: Write index into (*paOp)[] here */
Op **paOp /* OUT: Write the opcode array here */
){
int nRow; /* Stop when row count reaches this */
int nSub = 0; /* Number of sub-vdbes seen so far */
SubProgram **apSub = 0; /* Array of sub-vdbes */
int i; /* Next instruction address */
int rc = SQLITE_OK; /* Result code */
Op *aOp = 0; /* Opcode array */
int iPc; /* Rowid. Copy of value in *piPc */
/* When the number of output rows reaches nRow, that means the
** listing has finished and sqlite3_step() should return SQLITE_DONE.
** nRow is the sum of the number of rows in the main program, plus
** the sum of the number of rows in all trigger subprograms encountered
** so far. The nRow value will increase as new trigger subprograms are
** encountered, but p->pc will eventually catch up to nRow.
*/
nRow = p->nOp;
if( pSub!=0 ){
if( pSub->flags&MEM_Blob ){
/* pSub is initiallly NULL. It is initialized to a BLOB by
** the P4_SUBPROGRAM processing logic below */
nSub = pSub->n/sizeof(Vdbe*);
apSub = (SubProgram **)pSub->z;
}
for(i=0; i<nSub; i++){
nRow += apSub[i]->nOp;
}
}
iPc = *piPc;
while(1){ /* Loop exits via break */
i = iPc++;
if( i>=nRow ){
p->rc = SQLITE_OK;
rc = SQLITE_DONE;
break;
}
if( i<p->nOp ){
/* The rowid is small enough that we are still in the
** main program. */
aOp = p->aOp;
}else{
/* We are currently listing subprograms. Figure out which one and
** pick up the appropriate opcode. */
int j;
i -= p->nOp;
assert( apSub!=0 );
assert( nSub>0 );
for(j=0; i>=apSub[j]->nOp; j++){
i -= apSub[j]->nOp;
assert( i<apSub[j]->nOp || j+1<nSub );
}
aOp = apSub[j]->aOp;
}
/* When an OP_Program opcode is encounter (the only opcode that has
** a P4_SUBPROGRAM argument), expand the size of the array of subprograms
** kept in p->aMem[9].z to hold the new program - assuming this subprogram
** has not already been seen.
*/
if( pSub!=0 && aOp[i].p4type==P4_SUBPROGRAM ){
int nByte = (nSub+1)*sizeof(SubProgram*);
int j;
for(j=0; j<nSub; j++){
if( apSub[j]==aOp[i].p4.pProgram ) break;
}
if( j==nSub ){
p->rc = sqlite3VdbeMemGrow(pSub, nByte, nSub!=0);
if( p->rc!=SQLITE_OK ){
rc = SQLITE_ERROR;
break;
}
apSub = (SubProgram **)pSub->z;
apSub[nSub++] = aOp[i].p4.pProgram;
MemSetTypeFlag(pSub, MEM_Blob);
pSub->n = nSub*sizeof(SubProgram*);
nRow += aOp[i].p4.pProgram->nOp;
}
}
if( eMode==0 ) break;
#ifdef SQLITE_ENABLE_BYTECODE_VTAB
if( eMode==2 ){
Op *pOp = aOp + i;
if( pOp->opcode==OP_OpenRead ) break;
if( pOp->opcode==OP_OpenWrite && (pOp->p5 & OPFLAG_P2ISREG)==0 ) break;
if( pOp->opcode==OP_ReopenIdx ) break;
}else
#endif
{
assert( eMode==1 );
if( aOp[i].opcode==OP_Explain ) break;
if( aOp[i].opcode==OP_Init && iPc>1 ) break;
}
}
*piPc = iPc;
*piAddr = i;
*paOp = aOp;
return rc;
}
#endif /* SQLITE_ENABLE_BYTECODE_VTAB || !SQLITE_OMIT_EXPLAIN */
/*
** Delete a VdbeFrame object and its contents. VdbeFrame objects are
** allocated by the OP_Program opcode in sqlite3VdbeExec().
*/
void sqlite3VdbeFrameDelete(VdbeFrame *p){
int i;
Mem *aMem = VdbeFrameMem(p);
VdbeCursor **apCsr = (VdbeCursor **)&aMem[p->nChildMem];
assert( sqlite3VdbeFrameIsValid(p) );
for(i=0; i<p->nChildCsr; i++){
if( apCsr[i] ) sqlite3VdbeFreeCursorNN(p->v, apCsr[i]);
}
releaseMemArray(aMem, p->nChildMem);
sqlite3VdbeDeleteAuxData(p->v->db, &p->pAuxData, -1, 0);
sqlite3DbFree(p->v->db, p);
}
#ifndef SQLITE_OMIT_EXPLAIN
/*
** Give a listing of the program in the virtual machine.
**
** The interface is the same as sqlite3VdbeExec(). But instead of
** running the code, it invokes the callback once for each instruction.
** This feature is used to implement "EXPLAIN".
**
** When p->explain==1, each instruction is listed. When
** p->explain==2, only OP_Explain instructions are listed and these
** are shown in a different format. p->explain==2 is used to implement
** EXPLAIN QUERY PLAN.
** 2018-04-24: In p->explain==2 mode, the OP_Init opcodes of triggers
** are also shown, so that the boundaries between the main program and
** each trigger are clear.
**
** When p->explain==1, first the main program is listed, then each of
** the trigger subprograms are listed one by one.
*/
int sqlite3VdbeList(
Vdbe *p /* The VDBE */
){
Mem *pSub = 0; /* Memory cell hold array of subprogs */
sqlite3 *db = p->db; /* The database connection */
int i; /* Loop counter */
int rc = SQLITE_OK; /* Return code */
Mem *pMem = &p->aMem[1]; /* First Mem of result set */
int bListSubprogs = (p->explain==1 || (db->flags & SQLITE_TriggerEQP)!=0);
Op *aOp; /* Array of opcodes */
Op *pOp; /* Current opcode */
assert( p->explain );
assert( p->eVdbeState==VDBE_RUN_STATE );
assert( p->rc==SQLITE_OK || p->rc==SQLITE_BUSY || p->rc==SQLITE_NOMEM );
/* Even though this opcode does not use dynamic strings for
** the result, result columns may become dynamic if the user calls
** sqlite3_column_text16(), causing a translation to UTF-16 encoding.
*/
releaseMemArray(pMem, 8);
p->pResultSet = 0;
if( p->rc==SQLITE_NOMEM ){
/* This happens if a malloc() inside a call to sqlite3_column_text() or
** sqlite3_column_text16() failed. */
sqlite3OomFault(db);
return SQLITE_ERROR;
}
if( bListSubprogs ){
/* The first 8 memory cells are used for the result set. So we will
** commandeer the 9th cell to use as storage for an array of pointers
** to trigger subprograms. The VDBE is guaranteed to have at least 9
** cells. */
assert( p->nMem>9 );
pSub = &p->aMem[9];
}else{
pSub = 0;
}
/* Figure out which opcode is next to display */
rc = sqlite3VdbeNextOpcode(p, pSub, p->explain==2, &p->pc, &i, &aOp);
if( rc==SQLITE_OK ){
pOp = aOp + i;
if( AtomicLoad(&db->u1.isInterrupted) ){
p->rc = SQLITE_INTERRUPT;
rc = SQLITE_ERROR;
sqlite3VdbeError(p, sqlite3ErrStr(p->rc));
}else{
char *zP4 = sqlite3VdbeDisplayP4(db, pOp);
if( p->explain==2 ){
sqlite3VdbeMemSetInt64(pMem, pOp->p1);
sqlite3VdbeMemSetInt64(pMem+1, pOp->p2);
sqlite3VdbeMemSetInt64(pMem+2, pOp->p3);
sqlite3VdbeMemSetStr(pMem+3, zP4, -1, SQLITE_UTF8, sqlite3_free);
p->nResColumn = 4;
}else{
sqlite3VdbeMemSetInt64(pMem+0, i);
sqlite3VdbeMemSetStr(pMem+1, (char*)sqlite3OpcodeName(pOp->opcode),
-1, SQLITE_UTF8, SQLITE_STATIC);
sqlite3VdbeMemSetInt64(pMem+2, pOp->p1);
sqlite3VdbeMemSetInt64(pMem+3, pOp->p2);
sqlite3VdbeMemSetInt64(pMem+4, pOp->p3);
/* pMem+5 for p4 is done last */
sqlite3VdbeMemSetInt64(pMem+6, pOp->p5);
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
{
char *zCom = sqlite3VdbeDisplayComment(db, pOp, zP4);
sqlite3VdbeMemSetStr(pMem+7, zCom, -1, SQLITE_UTF8, sqlite3_free);
}
#else
sqlite3VdbeMemSetNull(pMem+7);
#endif
sqlite3VdbeMemSetStr(pMem+5, zP4, -1, SQLITE_UTF8, sqlite3_free);
p->nResColumn = 8;
}
p->pResultSet = pMem;
if( db->mallocFailed ){
p->rc = SQLITE_NOMEM;
rc = SQLITE_ERROR;
}else{
p->rc = SQLITE_OK;
rc = SQLITE_ROW;
}
}
}
return rc;
}
#endif /* SQLITE_OMIT_EXPLAIN */
#ifdef SQLITE_DEBUG
/*
** Print the SQL that was used to generate a VDBE program.
*/
void sqlite3VdbePrintSql(Vdbe *p){
const char *z = 0;
if( p->zSql ){
z = p->zSql;
}else if( p->nOp>=1 ){
const VdbeOp *pOp = &p->aOp[0];
if( pOp->opcode==OP_Init && pOp->p4.z!=0 ){
z = pOp->p4.z;
while( sqlite3Isspace(*z) ) z++;
}
}
if( z ) printf("SQL: [%s]\n", z);
}
#endif
#if !defined(SQLITE_OMIT_TRACE) && defined(SQLITE_ENABLE_IOTRACE)
/*
** Print an IOTRACE message showing SQL content.
*/
void sqlite3VdbeIOTraceSql(Vdbe *p){
int nOp = p->nOp;
VdbeOp *pOp;
if( sqlite3IoTrace==0 ) return;
if( nOp<1 ) return;
pOp = &p->aOp[0];
if( pOp->opcode==OP_Init && pOp->p4.z!=0 ){
int i, j;
char z[1000];
sqlite3_snprintf(sizeof(z), z, "%s", pOp->p4.z);
for(i=0; sqlite3Isspace(z[i]); i++){}
for(j=0; z[i]; i++){
if( sqlite3Isspace(z[i]) ){
if( z[i-1]!=' ' ){
z[j++] = ' ';
}
}else{
z[j++] = z[i];
}
}
z[j] = 0;
sqlite3IoTrace("SQL %s\n", z);
}
}
#endif /* !SQLITE_OMIT_TRACE && SQLITE_ENABLE_IOTRACE */
/* An instance of this object describes bulk memory available for use
** by subcomponents of a prepared statement. Space is allocated out
** of a ReusableSpace object by the allocSpace() routine below.
*/
struct ReusableSpace {
u8 *pSpace; /* Available memory */
sqlite3_int64 nFree; /* Bytes of available memory */
sqlite3_int64 nNeeded; /* Total bytes that could not be allocated */
};
/* Try to allocate nByte bytes of 8-byte aligned bulk memory for pBuf
** from the ReusableSpace object. Return a pointer to the allocated
** memory on success. If insufficient memory is available in the
** ReusableSpace object, increase the ReusableSpace.nNeeded
** value by the amount needed and return NULL.
**
** If pBuf is not initially NULL, that means that the memory has already
** been allocated by a prior call to this routine, so just return a copy
** of pBuf and leave ReusableSpace unchanged.
**
** This allocator is employed to repurpose unused slots at the end of the
** opcode array of prepared state for other memory needs of the prepared
** statement.
*/
static void *allocSpace(
struct ReusableSpace *p, /* Bulk memory available for allocation */
void *pBuf, /* Pointer to a prior allocation */
sqlite3_int64 nByte /* Bytes of memory needed. */
){
assert( EIGHT_BYTE_ALIGNMENT(p->pSpace) );
if( pBuf==0 ){
nByte = ROUND8P(nByte);
if( nByte <= p->nFree ){
p->nFree -= nByte;
pBuf = &p->pSpace[p->nFree];
}else{
p->nNeeded += nByte;
}
}
assert( EIGHT_BYTE_ALIGNMENT(pBuf) );
return pBuf;
}
/*
** Rewind the VDBE back to the beginning in preparation for
** running it.
*/
void sqlite3VdbeRewind(Vdbe *p){
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
int i;
#endif
assert( p!=0 );
assert( p->eVdbeState==VDBE_INIT_STATE
|| p->eVdbeState==VDBE_READY_STATE
|| p->eVdbeState==VDBE_HALT_STATE );
/* There should be at least one opcode.
*/
assert( p->nOp>0 );
p->eVdbeState = VDBE_READY_STATE;
#ifdef SQLITE_DEBUG
for(i=0; i<p->nMem; i++){
assert( p->aMem[i].db==p->db );
}
#endif
p->pc = -1;
p->rc = SQLITE_OK;
p->errorAction = OE_Abort;
p->nChange = 0;
p->cacheCtr = 1;
p->minWriteFileFormat = 255;
p->iStatement = 0;
p->nFkConstraint = 0;
#ifdef VDBE_PROFILE
for(i=0; i<p->nOp; i++){
p->aOp[i].cnt = 0;
p->aOp[i].cycles = 0;
}
#endif
}
/*
** Prepare a virtual machine for execution for the first time after
** creating the virtual machine. This involves things such
** as allocating registers and initializing the program counter.
** After the VDBE has be prepped, it can be executed by one or more
** calls to sqlite3VdbeExec().
**
** This function may be called exactly once on each virtual machine.
** After this routine is called the VM has been "packaged" and is ready
** to run. After this routine is called, further calls to
** sqlite3VdbeAddOp() functions are prohibited. This routine disconnects
** the Vdbe from the Parse object that helped generate it so that the
** the Vdbe becomes an independent entity and the Parse object can be
** destroyed.
**
** Use the sqlite3VdbeRewind() procedure to restore a virtual machine back
** to its initial state after it has been run.
*/
void sqlite3VdbeMakeReady(
Vdbe *p, /* The VDBE */
Parse *pParse /* Parsing context */
){
sqlite3 *db; /* The database connection */
int nVar; /* Number of parameters */
int nMem; /* Number of VM memory registers */
int nCursor; /* Number of cursors required */
int nArg; /* Number of arguments in subprograms */
int n; /* Loop counter */
struct ReusableSpace x; /* Reusable bulk memory */
assert( p!=0 );
assert( p->nOp>0 );
assert( pParse!=0 );
assert( p->eVdbeState==VDBE_INIT_STATE );
assert( pParse==p->pParse );
p->pVList = pParse->pVList;
pParse->pVList = 0;
db = p->db;
assert( db->mallocFailed==0 );
nVar = pParse->nVar;
nMem = pParse->nMem;
nCursor = pParse->nTab;
nArg = pParse->nMaxArg;
/* Each cursor uses a memory cell. The first cursor (cursor 0) can
** use aMem[0] which is not otherwise used by the VDBE program. Allocate
** space at the end of aMem[] for cursors 1 and greater.
** See also: allocateCursor().
*/
nMem += nCursor;
if( nCursor==0 && nMem>0 ) nMem++; /* Space for aMem[0] even if not used */
/* Figure out how much reusable memory is available at the end of the
** opcode array. This extra memory will be reallocated for other elements
** of the prepared statement.
*/
n = ROUND8P(sizeof(Op)*p->nOp); /* Bytes of opcode memory used */
x.pSpace = &((u8*)p->aOp)[n]; /* Unused opcode memory */
assert( EIGHT_BYTE_ALIGNMENT(x.pSpace) );
x.nFree = ROUNDDOWN8(pParse->szOpAlloc - n); /* Bytes of unused memory */
assert( x.nFree>=0 );
assert( EIGHT_BYTE_ALIGNMENT(&x.pSpace[x.nFree]) );
resolveP2Values(p, &nArg);
p->usesStmtJournal = (u8)(pParse->isMultiWrite && pParse->mayAbort);
if( pParse->explain ){
static const char * const azColName[] = {
"addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
"id", "parent", "notused", "detail"
};
int iFirst, mx, i;
if( nMem<10 ) nMem = 10;
p->explain = pParse->explain;
if( pParse->explain==2 ){
sqlite3VdbeSetNumCols(p, 4);
iFirst = 8;
mx = 12;
}else{
sqlite3VdbeSetNumCols(p, 8);
iFirst = 0;
mx = 8;
}
for(i=iFirst; i<mx; i++){
sqlite3VdbeSetColName(p, i-iFirst, COLNAME_NAME,
azColName[i], SQLITE_STATIC);
}
}
p->expired = 0;
/* Memory for registers, parameters, cursor, etc, is allocated in one or two
** passes. On the first pass, we try to reuse unused memory at the
** end of the opcode array. If we are unable to satisfy all memory
** requirements by reusing the opcode array tail, then the second
** pass will fill in the remainder using a fresh memory allocation.
**
** This two-pass approach that reuses as much memory as possible from
** the leftover memory at the end of the opcode array. This can significantly
** reduce the amount of memory held by a prepared statement.
*/
x.nNeeded = 0;
p->aMem = allocSpace(&x, 0, nMem*sizeof(Mem));
p->aVar = allocSpace(&x, 0, nVar*sizeof(Mem));
p->apArg = allocSpace(&x, 0, nArg*sizeof(Mem*));
p->apCsr = allocSpace(&x, 0, nCursor*sizeof(VdbeCursor*));
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
p->anExec = allocSpace(&x, 0, p->nOp*sizeof(i64));
#endif
if( x.nNeeded ){
x.pSpace = p->pFree = sqlite3DbMallocRawNN(db, x.nNeeded);
x.nFree = x.nNeeded;
if( !db->mallocFailed ){
p->aMem = allocSpace(&x, p->aMem, nMem*sizeof(Mem));
p->aVar = allocSpace(&x, p->aVar, nVar*sizeof(Mem));
p->apArg = allocSpace(&x, p->apArg, nArg*sizeof(Mem*));
p->apCsr = allocSpace(&x, p->apCsr, nCursor*sizeof(VdbeCursor*));
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
p->anExec = allocSpace(&x, p->anExec, p->nOp*sizeof(i64));
#endif
}
}
if( db->mallocFailed ){
p->nVar = 0;
p->nCursor = 0;
p->nMem = 0;
}else{
p->nCursor = nCursor;
p->nVar = (ynVar)nVar;
initMemArray(p->aVar, nVar, db, MEM_Null);
p->nMem = nMem;
initMemArray(p->aMem, nMem, db, MEM_Undefined);
memset(p->apCsr, 0, nCursor*sizeof(VdbeCursor*));
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
memset(p->anExec, 0, p->nOp*sizeof(i64));
#endif
}
sqlite3VdbeRewind(p);
}
/*
** Close a VDBE cursor and release all the resources that cursor
** happens to hold.
*/
void sqlite3VdbeFreeCursor(Vdbe *p, VdbeCursor *pCx){
if( pCx ) sqlite3VdbeFreeCursorNN(p,pCx);
}
void sqlite3VdbeFreeCursorNN(Vdbe *p, VdbeCursor *pCx){
switch( pCx->eCurType ){
case CURTYPE_SORTER: {
sqlite3VdbeSorterClose(p->db, pCx);
break;
}
case CURTYPE_BTREE: {
assert( pCx->uc.pCursor!=0 );
sqlite3BtreeCloseCursor(pCx->uc.pCursor);
break;
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
case CURTYPE_VTAB: {
sqlite3_vtab_cursor *pVCur = pCx->uc.pVCur;
const sqlite3_module *pModule = pVCur->pVtab->pModule;
assert( pVCur->pVtab->nRef>0 );
pVCur->pVtab->nRef--;
pModule->xClose(pVCur);
break;
}
#endif
}
}
/*
** Close all cursors in the current frame.
*/
static void closeCursorsInFrame(Vdbe *p){
int i;
for(i=0; i<p->nCursor; i++){
VdbeCursor *pC = p->apCsr[i];
if( pC ){
sqlite3VdbeFreeCursorNN(p, pC);
p->apCsr[i] = 0;
}
}
}
/*
** Copy the values stored in the VdbeFrame structure to its Vdbe. This
** is used, for example, when a trigger sub-program is halted to restore
** control to the main program.
*/
int sqlite3VdbeFrameRestore(VdbeFrame *pFrame){
Vdbe *v = pFrame->v;
closeCursorsInFrame(v);
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
v->anExec = pFrame->anExec;
#endif
v->aOp = pFrame->aOp;
v->nOp = pFrame->nOp;
v->aMem = pFrame->aMem;
v->nMem = pFrame->nMem;
v->apCsr = pFrame->apCsr;
v->nCursor = pFrame->nCursor;
v->db->lastRowid = pFrame->lastRowid;
v->nChange = pFrame->nChange;
v->db->nChange = pFrame->nDbChange;
sqlite3VdbeDeleteAuxData(v->db, &v->pAuxData, -1, 0);
v->pAuxData = pFrame->pAuxData;
pFrame->pAuxData = 0;
return pFrame->pc;
}
/*
** Close all cursors.
**
** Also release any dynamic memory held by the VM in the Vdbe.aMem memory
** cell array. This is necessary as the memory cell array may contain
** pointers to VdbeFrame objects, which may in turn contain pointers to
** open cursors.
*/
static void closeAllCursors(Vdbe *p){
if( p->pFrame ){
VdbeFrame *pFrame;
for(pFrame=p->pFrame; pFrame->pParent; pFrame=pFrame->pParent);
sqlite3VdbeFrameRestore(pFrame);
p->pFrame = 0;
p->nFrame = 0;
}
assert( p->nFrame==0 );
closeCursorsInFrame(p);
releaseMemArray(p->aMem, p->nMem);
while( p->pDelFrame ){
VdbeFrame *pDel = p->pDelFrame;
p->pDelFrame = pDel->pParent;
sqlite3VdbeFrameDelete(pDel);
}
/* Delete any auxdata allocations made by the VM */
if( p->pAuxData ) sqlite3VdbeDeleteAuxData(p->db, &p->pAuxData, -1, 0);
assert( p->pAuxData==0 );
}
/*
** Set the number of result columns that will be returned by this SQL
** statement. This is now set at compile time, rather than during
** execution of the vdbe program so that sqlite3_column_count() can
** be called on an SQL statement before sqlite3_step().
*/
void sqlite3VdbeSetNumCols(Vdbe *p, int nResColumn){
int n;
sqlite3 *db = p->db;
if( p->nResColumn ){
releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
sqlite3DbFree(db, p->aColName);
}
n = nResColumn*COLNAME_N;
p->nResColumn = (u16)nResColumn;
p->aColName = (Mem*)sqlite3DbMallocRawNN(db, sizeof(Mem)*n );
if( p->aColName==0 ) return;
initMemArray(p->aColName, n, db, MEM_Null);
}
/*
** Set the name of the idx'th column to be returned by the SQL statement.
** zName must be a pointer to a nul terminated string.
**
** This call must be made after a call to sqlite3VdbeSetNumCols().
**
** The final parameter, xDel, must be one of SQLITE_DYNAMIC, SQLITE_STATIC
** or SQLITE_TRANSIENT. If it is SQLITE_DYNAMIC, then the buffer pointed
** to by zName will be freed by sqlite3DbFree() when the vdbe is destroyed.
*/
int sqlite3VdbeSetColName(
Vdbe *p, /* Vdbe being configured */
int idx, /* Index of column zName applies to */
int var, /* One of the COLNAME_* constants */
const char *zName, /* Pointer to buffer containing name */
void (*xDel)(void*) /* Memory management strategy for zName */
){
int rc;
Mem *pColName;
assert( idx<p->nResColumn );
assert( var<COLNAME_N );
if( p->db->mallocFailed ){
assert( !zName || xDel!=SQLITE_DYNAMIC );
return SQLITE_NOMEM_BKPT;
}
assert( p->aColName!=0 );
pColName = &(p->aColName[idx+var*p->nResColumn]);
rc = sqlite3VdbeMemSetStr(pColName, zName, -1, SQLITE_UTF8, xDel);
assert( rc!=0 || !zName || (pColName->flags&MEM_Term)!=0 );
return rc;
}
/*
** A read or write transaction may or may not be active on database handle
** db. If a transaction is active, commit it. If there is a
** write-transaction spanning more than one database file, this routine
** takes care of the super-journal trickery.
*/
static int vdbeCommit(sqlite3 *db, Vdbe *p){
int i;
int nTrans = 0; /* Number of databases with an active write-transaction
** that are candidates for a two-phase commit using a
** super-journal */
int rc = SQLITE_OK;
int needXcommit = 0;
#ifdef SQLITE_OMIT_VIRTUALTABLE
/* With this option, sqlite3VtabSync() is defined to be simply
** SQLITE_OK so p is not used.
*/
UNUSED_PARAMETER(p);
#endif
/* Before doing anything else, call the xSync() callback for any
** virtual module tables written in this transaction. This has to
** be done before determining whether a super-journal file is
** required, as an xSync() callback may add an attached database
** to the transaction.
*/
rc = sqlite3VtabSync(db, p);
/* This loop determines (a) if the commit hook should be invoked and
** (b) how many database files have open write transactions, not
** including the temp database. (b) is important because if more than
** one database file has an open write transaction, a super-journal
** file is required for an atomic commit.
*/
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( sqlite3BtreeTxnState(pBt)==SQLITE_TXN_WRITE ){
/* Whether or not a database might need a super-journal depends upon
** its journal mode (among other things). This matrix determines which
** journal modes use a super-journal and which do not */
static const u8 aMJNeeded[] = {
/* DELETE */ 1,
/* PERSIST */ 1,
/* OFF */ 0,
/* TRUNCATE */ 1,
/* MEMORY */ 0,
/* WAL */ 0
};
Pager *pPager; /* Pager associated with pBt */
needXcommit = 1;
sqlite3BtreeEnter(pBt);
pPager = sqlite3BtreePager(pBt);
if( db->aDb[i].safety_level!=PAGER_SYNCHRONOUS_OFF
&& aMJNeeded[sqlite3PagerGetJournalMode(pPager)]
&& sqlite3PagerIsMemdb(pPager)==0
){
assert( i!=1 );
nTrans++;
}
rc = sqlite3PagerExclusiveLock(pPager);
sqlite3BtreeLeave(pBt);
}
}
if( rc!=SQLITE_OK ){
return rc;
}
/* If there are any write-transactions at all, invoke the commit hook */
if( needXcommit && db->xCommitCallback ){
rc = db->xCommitCallback(db->pCommitArg);
if( rc ){
return SQLITE_CONSTRAINT_COMMITHOOK;
}
}
/* The simple case - no more than one database file (not counting the
** TEMP database) has a transaction active. There is no need for the
** super-journal.
**
** If the return value of sqlite3BtreeGetFilename() is a zero length
** string, it means the main database is :memory: or a temp file. In
** that case we do not support atomic multi-file commits, so use the
** simple case then too.
*/
if( 0==sqlite3Strlen30(sqlite3BtreeGetFilename(db->aDb[0].pBt))
|| nTrans<=1
){
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
rc = sqlite3BtreeCommitPhaseOne(pBt, 0);
}
}
/* Do the commit only if all databases successfully complete phase 1.
** If one of the BtreeCommitPhaseOne() calls fails, this indicates an
** IO error while deleting or truncating a journal file. It is unlikely,
** but could happen. In this case abandon processing and return the error.
*/
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
rc = sqlite3BtreeCommitPhaseTwo(pBt, 0);
}
}
if( rc==SQLITE_OK ){
sqlite3VtabCommit(db);
}
}
/* The complex case - There is a multi-file write-transaction active.
** This requires a super-journal file to ensure the transaction is
** committed atomically.
*/
#ifndef SQLITE_OMIT_DISKIO
else{
sqlite3_vfs *pVfs = db->pVfs;
char *zSuper = 0; /* File-name for the super-journal */
char const *zMainFile = sqlite3BtreeGetFilename(db->aDb[0].pBt);
sqlite3_file *pSuperJrnl = 0;
i64 offset = 0;
int res;
int retryCount = 0;
int nMainFile;
/* Select a super-journal file name */
nMainFile = sqlite3Strlen30(zMainFile);
zSuper = sqlite3MPrintf(db, "%.4c%s%.16c", 0,zMainFile,0);
if( zSuper==0 ) return SQLITE_NOMEM_BKPT;
zSuper += 4;
do {
u32 iRandom;
if( retryCount ){
if( retryCount>100 ){
sqlite3_log(SQLITE_FULL, "MJ delete: %s", zSuper);
sqlite3OsDelete(pVfs, zSuper, 0);
break;
}else if( retryCount==1 ){
sqlite3_log(SQLITE_FULL, "MJ collide: %s", zSuper);
}
}
retryCount++;
sqlite3_randomness(sizeof(iRandom), &iRandom);
sqlite3_snprintf(13, &zSuper[nMainFile], "-mj%06X9%02X",
(iRandom>>8)&0xffffff, iRandom&0xff);
/* The antipenultimate character of the super-journal name must
** be "9" to avoid name collisions when using 8+3 filenames. */
assert( zSuper[sqlite3Strlen30(zSuper)-3]=='9' );
sqlite3FileSuffix3(zMainFile, zSuper);
rc = sqlite3OsAccess(pVfs, zSuper, SQLITE_ACCESS_EXISTS, &res);
}while( rc==SQLITE_OK && res );
if( rc==SQLITE_OK ){
/* Open the super-journal. */
rc = sqlite3OsOpenMalloc(pVfs, zSuper, &pSuperJrnl,
SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|
SQLITE_OPEN_EXCLUSIVE|SQLITE_OPEN_SUPER_JOURNAL, 0
);
}
if( rc!=SQLITE_OK ){
sqlite3DbFree(db, zSuper-4);
return rc;
}
/* Write the name of each database file in the transaction into the new
** super-journal file. If an error occurs at this point close
** and delete the super-journal file. All the individual journal files
** still have 'null' as the super-journal pointer, so they will roll
** back independently if a failure occurs.
*/
for(i=0; i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( sqlite3BtreeTxnState(pBt)==SQLITE_TXN_WRITE ){
char const *zFile = sqlite3BtreeGetJournalname(pBt);
if( zFile==0 ){
continue; /* Ignore TEMP and :memory: databases */
}
assert( zFile[0]!=0 );
rc = sqlite3OsWrite(pSuperJrnl, zFile, sqlite3Strlen30(zFile)+1,offset);
offset += sqlite3Strlen30(zFile)+1;
if( rc!=SQLITE_OK ){
sqlite3OsCloseFree(pSuperJrnl);
sqlite3OsDelete(pVfs, zSuper, 0);
sqlite3DbFree(db, zSuper-4);
return rc;
}
}
}
/* Sync the super-journal file. If the IOCAP_SEQUENTIAL device
** flag is set this is not required.
*/
if( 0==(sqlite3OsDeviceCharacteristics(pSuperJrnl)&SQLITE_IOCAP_SEQUENTIAL)
&& SQLITE_OK!=(rc = sqlite3OsSync(pSuperJrnl, SQLITE_SYNC_NORMAL))
){
sqlite3OsCloseFree(pSuperJrnl);
sqlite3OsDelete(pVfs, zSuper, 0);
sqlite3DbFree(db, zSuper-4);
return rc;
}
/* Sync all the db files involved in the transaction. The same call
** sets the super-journal pointer in each individual journal. If
** an error occurs here, do not delete the super-journal file.
**
** If the error occurs during the first call to
** sqlite3BtreeCommitPhaseOne(), then there is a chance that the
** super-journal file will be orphaned. But we cannot delete it,
** in case the super-journal file name was written into the journal
** file before the failure occurred.
*/
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
rc = sqlite3BtreeCommitPhaseOne(pBt, zSuper);
}
}
sqlite3OsCloseFree(pSuperJrnl);
assert( rc!=SQLITE_BUSY );
if( rc!=SQLITE_OK ){
sqlite3DbFree(db, zSuper-4);
return rc;
}
/* Delete the super-journal file. This commits the transaction. After
** doing this the directory is synced again before any individual
** transaction files are deleted.
*/
rc = sqlite3OsDelete(pVfs, zSuper, 1);
sqlite3DbFree(db, zSuper-4);
zSuper = 0;
if( rc ){
return rc;
}
/* All files and directories have already been synced, so the following
** calls to sqlite3BtreeCommitPhaseTwo() are only closing files and
** deleting or truncating journals. If something goes wrong while
** this is happening we don't really care. The integrity of the
** transaction is already guaranteed, but some stray 'cold' journals
** may be lying around. Returning an error code won't help matters.
*/
disable_simulated_io_errors();
sqlite3BeginBenignMalloc();
for(i=0; i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
sqlite3BtreeCommitPhaseTwo(pBt, 1);
}
}
sqlite3EndBenignMalloc();
enable_simulated_io_errors();
sqlite3VtabCommit(db);
}
#endif
return rc;
}
/*
** This routine checks that the sqlite3.nVdbeActive count variable
** matches the number of vdbe's in the list sqlite3.pVdbe that are
** currently active. An assertion fails if the two counts do not match.
** This is an internal self-check only - it is not an essential processing
** step.
**
** This is a no-op if NDEBUG is defined.
*/
#ifndef NDEBUG
static void checkActiveVdbeCnt(sqlite3 *db){
Vdbe *p;
int cnt = 0;
int nWrite = 0;
int nRead = 0;
p = db->pVdbe;
while( p ){
if( sqlite3_stmt_busy((sqlite3_stmt*)p) ){
cnt++;
if( p->readOnly==0 ) nWrite++;
if( p->bIsReader ) nRead++;
}
p = p->pVNext;
}
assert( cnt==db->nVdbeActive );
assert( nWrite==db->nVdbeWrite );
assert( nRead==db->nVdbeRead );
}
#else
#define checkActiveVdbeCnt(x)
#endif
/*
** If the Vdbe passed as the first argument opened a statement-transaction,
** close it now. Argument eOp must be either SAVEPOINT_ROLLBACK or
** SAVEPOINT_RELEASE. If it is SAVEPOINT_ROLLBACK, then the statement
** transaction is rolled back. If eOp is SAVEPOINT_RELEASE, then the
** statement transaction is committed.
**
** If an IO error occurs, an SQLITE_IOERR_XXX error code is returned.
** Otherwise SQLITE_OK.
*/
static SQLITE_NOINLINE int vdbeCloseStatement(Vdbe *p, int eOp){
sqlite3 *const db = p->db;
int rc = SQLITE_OK;
int i;
const int iSavepoint = p->iStatement-1;
assert( eOp==SAVEPOINT_ROLLBACK || eOp==SAVEPOINT_RELEASE);
assert( db->nStatement>0 );
assert( p->iStatement==(db->nStatement+db->nSavepoint) );
for(i=0; i<db->nDb; i++){
int rc2 = SQLITE_OK;
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
if( eOp==SAVEPOINT_ROLLBACK ){
rc2 = sqlite3BtreeSavepoint(pBt, SAVEPOINT_ROLLBACK, iSavepoint);
}
if( rc2==SQLITE_OK ){
rc2 = sqlite3BtreeSavepoint(pBt, SAVEPOINT_RELEASE, iSavepoint);
}
if( rc==SQLITE_OK ){
rc = rc2;
}
}
}
db->nStatement--;
p->iStatement = 0;
if( rc==SQLITE_OK ){
if( eOp==SAVEPOINT_ROLLBACK ){
rc = sqlite3VtabSavepoint(db, SAVEPOINT_ROLLBACK, iSavepoint);
}
if( rc==SQLITE_OK ){
rc = sqlite3VtabSavepoint(db, SAVEPOINT_RELEASE, iSavepoint);
}
}
/* If the statement transaction is being rolled back, also restore the
** database handles deferred constraint counter to the value it had when
** the statement transaction was opened. */
if( eOp==SAVEPOINT_ROLLBACK ){
db->nDeferredCons = p->nStmtDefCons;
db->nDeferredImmCons = p->nStmtDefImmCons;
}
return rc;
}
int sqlite3VdbeCloseStatement(Vdbe *p, int eOp){
if( p->db->nStatement && p->iStatement ){
return vdbeCloseStatement(p, eOp);
}
return SQLITE_OK;
}
/*
** This function is called when a transaction opened by the database
** handle associated with the VM passed as an argument is about to be
** committed. If there are outstanding deferred foreign key constraint
** violations, return SQLITE_ERROR. Otherwise, SQLITE_OK.
**
** If there are outstanding FK violations and this function returns
** SQLITE_ERROR, set the result of the VM to SQLITE_CONSTRAINT_FOREIGNKEY
** and write an error message to it. Then return SQLITE_ERROR.
*/
#ifndef SQLITE_OMIT_FOREIGN_KEY
int sqlite3VdbeCheckFk(Vdbe *p, int deferred){
sqlite3 *db = p->db;
if( (deferred && (db->nDeferredCons+db->nDeferredImmCons)>0)
|| (!deferred && p->nFkConstraint>0)
){
p->rc = SQLITE_CONSTRAINT_FOREIGNKEY;
p->errorAction = OE_Abort;
sqlite3VdbeError(p, "FOREIGN KEY constraint failed");
if( (p->prepFlags & SQLITE_PREPARE_SAVESQL)==0 ) return SQLITE_ERROR;
return SQLITE_CONSTRAINT_FOREIGNKEY;
}
return SQLITE_OK;
}
#endif
/*
** This routine is called the when a VDBE tries to halt. If the VDBE
** has made changes and is in autocommit mode, then commit those
** changes. If a rollback is needed, then do the rollback.
**
** This routine is the only way to move the sqlite3eOpenState of a VM from
** SQLITE_STATE_RUN to SQLITE_STATE_HALT. It is harmless to
** call this on a VM that is in the SQLITE_STATE_HALT state.
**
** Return an error code. If the commit could not complete because of
** lock contention, return SQLITE_BUSY. If SQLITE_BUSY is returned, it
** means the close did not happen and needs to be repeated.
*/
int sqlite3VdbeHalt(Vdbe *p){
int rc; /* Used to store transient return codes */
sqlite3 *db = p->db;
/* This function contains the logic that determines if a statement or
** transaction will be committed or rolled back as a result of the
** execution of this virtual machine.
**
** If any of the following errors occur:
**
** SQLITE_NOMEM
** SQLITE_IOERR
** SQLITE_FULL
** SQLITE_INTERRUPT
**
** Then the internal cache might have been left in an inconsistent
** state. We need to rollback the statement transaction, if there is
** one, or the complete transaction if there is no statement transaction.
*/
assert( p->eVdbeState==VDBE_RUN_STATE );
if( db->mallocFailed ){
p->rc = SQLITE_NOMEM_BKPT;
}
closeAllCursors(p);
checkActiveVdbeCnt(db);
/* No commit or rollback needed if the program never started or if the
** SQL statement does not read or write a database file. */
if( p->bIsReader ){
int mrc; /* Primary error code from p->rc */
int eStatementOp = 0;
int isSpecialError; /* Set to true if a 'special' error */
/* Lock all btrees used by the statement */
sqlite3VdbeEnter(p);
/* Check for one of the special errors */
if( p->rc ){
mrc = p->rc & 0xff;
isSpecialError = mrc==SQLITE_NOMEM
|| mrc==SQLITE_IOERR
|| mrc==SQLITE_INTERRUPT
|| mrc==SQLITE_FULL;
}else{
mrc = isSpecialError = 0;
}
if( isSpecialError ){
/* If the query was read-only and the error code is SQLITE_INTERRUPT,
** no rollback is necessary. Otherwise, at least a savepoint
** transaction must be rolled back to restore the database to a
** consistent state.
**
** Even if the statement is read-only, it is important to perform
** a statement or transaction rollback operation. If the error
** occurred while writing to the journal, sub-journal or database
** file as part of an effort to free up cache space (see function
** pagerStress() in pager.c), the rollback is required to restore
** the pager to a consistent state.
*/
if( !p->readOnly || mrc!=SQLITE_INTERRUPT ){
if( (mrc==SQLITE_NOMEM || mrc==SQLITE_FULL) && p->usesStmtJournal ){
eStatementOp = SAVEPOINT_ROLLBACK;
}else{
/* We are forced to roll back the active transaction. Before doing
** so, abort any other statements this handle currently has active.
*/
sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
sqlite3CloseSavepoints(db);
db->autoCommit = 1;
p->nChange = 0;
}
}
}
/* Check for immediate foreign key violations. */
if( p->rc==SQLITE_OK || (p->errorAction==OE_Fail && !isSpecialError) ){
sqlite3VdbeCheckFk(p, 0);
}
/* If the auto-commit flag is set and this is the only active writer
** VM, then we do either a commit or rollback of the current transaction.
**
** Note: This block also runs if one of the special errors handled
** above has occurred.
*/
if( !sqlite3VtabInSync(db)
&& db->autoCommit
&& db->nVdbeWrite==(p->readOnly==0)
){
if( p->rc==SQLITE_OK || (p->errorAction==OE_Fail && !isSpecialError) ){
rc = sqlite3VdbeCheckFk(p, 1);
if( rc!=SQLITE_OK ){
if( NEVER(p->readOnly) ){
sqlite3VdbeLeave(p);
return SQLITE_ERROR;
}
rc = SQLITE_CONSTRAINT_FOREIGNKEY;
}else if( db->flags & SQLITE_CorruptRdOnly ){
rc = SQLITE_CORRUPT;
db->flags &= ~SQLITE_CorruptRdOnly;
}else{
/* The auto-commit flag is true, the vdbe program was successful
** or hit an 'OR FAIL' constraint and there are no deferred foreign
** key constraints to hold up the transaction. This means a commit
** is required. */
rc = vdbeCommit(db, p);
}
if( rc==SQLITE_BUSY && p->readOnly ){
sqlite3VdbeLeave(p);
return SQLITE_BUSY;
}else if( rc!=SQLITE_OK ){
p->rc = rc;
sqlite3RollbackAll(db, SQLITE_OK);
p->nChange = 0;
}else{
db->nDeferredCons = 0;
db->nDeferredImmCons = 0;
db->flags &= ~(u64)SQLITE_DeferFKs;
sqlite3CommitInternalChanges(db);
}
}else{
sqlite3RollbackAll(db, SQLITE_OK);
p->nChange = 0;
}
db->nStatement = 0;
}else if( eStatementOp==0 ){
if( p->rc==SQLITE_OK || p->errorAction==OE_Fail ){
eStatementOp = SAVEPOINT_RELEASE;
}else if( p->errorAction==OE_Abort ){
eStatementOp = SAVEPOINT_ROLLBACK;
}else{
sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
sqlite3CloseSavepoints(db);
db->autoCommit = 1;
p->nChange = 0;
}
}
/* If eStatementOp is non-zero, then a statement transaction needs to
** be committed or rolled back. Call sqlite3VdbeCloseStatement() to
** do so. If this operation returns an error, and the current statement
** error code is SQLITE_OK or SQLITE_CONSTRAINT, then promote the
** current statement error code.
*/
if( eStatementOp ){
rc = sqlite3VdbeCloseStatement(p, eStatementOp);
if( rc ){
if( p->rc==SQLITE_OK || (p->rc&0xff)==SQLITE_CONSTRAINT ){
p->rc = rc;
sqlite3DbFree(db, p->zErrMsg);
p->zErrMsg = 0;
}
sqlite3RollbackAll(db, SQLITE_ABORT_ROLLBACK);
sqlite3CloseSavepoints(db);
db->autoCommit = 1;
p->nChange = 0;
}
}
/* If this was an INSERT, UPDATE or DELETE and no statement transaction
** has been rolled back, update the database connection change-counter.
*/
if( p->changeCntOn ){
if( eStatementOp!=SAVEPOINT_ROLLBACK ){
sqlite3VdbeSetChanges(db, p->nChange);
}else{
sqlite3VdbeSetChanges(db, 0);
}
p->nChange = 0;
}
/* Release the locks */
sqlite3VdbeLeave(p);
}
/* We have successfully halted and closed the VM. Record this fact. */
db->nVdbeActive--;
if( !p->readOnly ) db->nVdbeWrite--;
if( p->bIsReader ) db->nVdbeRead--;
assert( db->nVdbeActive>=db->nVdbeRead );
assert( db->nVdbeRead>=db->nVdbeWrite );
assert( db->nVdbeWrite>=0 );
p->eVdbeState = VDBE_HALT_STATE;
checkActiveVdbeCnt(db);
if( db->mallocFailed ){
p->rc = SQLITE_NOMEM_BKPT;
}
/* If the auto-commit flag is set to true, then any locks that were held
** by connection db have now been released. Call sqlite3ConnectionUnlocked()
** to invoke any required unlock-notify callbacks.
*/
if( db->autoCommit ){
sqlite3ConnectionUnlocked(db);
}
assert( db->nVdbeActive>0 || db->autoCommit==0 || db->nStatement==0 );
return (p->rc==SQLITE_BUSY ? SQLITE_BUSY : SQLITE_OK);
}
/*
** Each VDBE holds the result of the most recent sqlite3_step() call
** in p->rc. This routine sets that result back to SQLITE_OK.
*/
void sqlite3VdbeResetStepResult(Vdbe *p){
p->rc = SQLITE_OK;
}
/*
** Copy the error code and error message belonging to the VDBE passed
** as the first argument to its database handle (so that they will be
** returned by calls to sqlite3_errcode() and sqlite3_errmsg()).
**
** This function does not clear the VDBE error code or message, just
** copies them to the database handle.
*/
int sqlite3VdbeTransferError(Vdbe *p){
sqlite3 *db = p->db;
int rc = p->rc;
if( p->zErrMsg ){
db->bBenignMalloc++;
sqlite3BeginBenignMalloc();
if( db->pErr==0 ) db->pErr = sqlite3ValueNew(db);
sqlite3ValueSetStr(db->pErr, -1, p->zErrMsg, SQLITE_UTF8, SQLITE_TRANSIENT);
sqlite3EndBenignMalloc();
db->bBenignMalloc--;
}else if( db->pErr ){
sqlite3ValueSetNull(db->pErr);
}
db->errCode = rc;
db->errByteOffset = -1;
return rc;
}
#ifdef SQLITE_ENABLE_SQLLOG
/*
** If an SQLITE_CONFIG_SQLLOG hook is registered and the VM has been run,
** invoke it.
*/
static void vdbeInvokeSqllog(Vdbe *v){
if( sqlite3GlobalConfig.xSqllog && v->rc==SQLITE_OK && v->zSql && v->pc>=0 ){
char *zExpanded = sqlite3VdbeExpandSql(v, v->zSql);
assert( v->db->init.busy==0 );
if( zExpanded ){
sqlite3GlobalConfig.xSqllog(
sqlite3GlobalConfig.pSqllogArg, v->db, zExpanded, 1
);
sqlite3DbFree(v->db, zExpanded);
}
}
}
#else
# define vdbeInvokeSqllog(x)
#endif
/*
** Clean up a VDBE after execution but do not delete the VDBE just yet.
** Write any error messages into *pzErrMsg. Return the result code.
**
** After this routine is run, the VDBE should be ready to be executed
** again.
**
** To look at it another way, this routine resets the state of the
** virtual machine from VDBE_RUN_STATE or VDBE_HALT_STATE back to
** VDBE_READY_STATE.
*/
int sqlite3VdbeReset(Vdbe *p){
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
int i;
#endif
sqlite3 *db;
db = p->db;
/* If the VM did not run to completion or if it encountered an
** error, then it might not have been halted properly. So halt
** it now.
*/
if( p->eVdbeState==VDBE_RUN_STATE ) sqlite3VdbeHalt(p);
/* If the VDBE has been run even partially, then transfer the error code
** and error message from the VDBE into the main database structure. But
** if the VDBE has just been set to run but has not actually executed any
** instructions yet, leave the main database error information unchanged.
*/
if( p->pc>=0 ){
vdbeInvokeSqllog(p);
if( db->pErr || p->zErrMsg ){
sqlite3VdbeTransferError(p);
}else{
db->errCode = p->rc;
}
}
/* Reset register contents and reclaim error message memory.
*/
#ifdef SQLITE_DEBUG
/* Execute assert() statements to ensure that the Vdbe.apCsr[] and
** Vdbe.aMem[] arrays have already been cleaned up. */
if( p->apCsr ) for(i=0; i<p->nCursor; i++) assert( p->apCsr[i]==0 );
if( p->aMem ){
for(i=0; i<p->nMem; i++) assert( p->aMem[i].flags==MEM_Undefined );
}
#endif
if( p->zErrMsg ){
sqlite3DbFree(db, p->zErrMsg);
p->zErrMsg = 0;
}
p->pResultSet = 0;
#ifdef SQLITE_DEBUG
p->nWrite = 0;
#endif
/* Save profiling information from this VDBE run.
*/
#ifdef VDBE_PROFILE
{
FILE *out = fopen("vdbe_profile.out", "a");
if( out ){
fprintf(out, "---- ");
for(i=0; i<p->nOp; i++){
fprintf(out, "%02x", p->aOp[i].opcode);
}
fprintf(out, "\n");
if( p->zSql ){
char c, pc = 0;
fprintf(out, "-- ");
for(i=0; (c = p->zSql[i])!=0; i++){
if( pc=='\n' ) fprintf(out, "-- ");
putc(c, out);
pc = c;
}
if( pc!='\n' ) fprintf(out, "\n");
}
for(i=0; i<p->nOp; i++){
char zHdr[100];
sqlite3_snprintf(sizeof(zHdr), zHdr, "%6u %12llu %8llu ",
p->aOp[i].cnt,
p->aOp[i].cycles,
p->aOp[i].cnt>0 ? p->aOp[i].cycles/p->aOp[i].cnt : 0
);
fprintf(out, "%s", zHdr);
sqlite3VdbePrintOp(out, i, &p->aOp[i]);
}
fclose(out);
}
}
#endif
return p->rc & db->errMask;
}
/*
** Clean up and delete a VDBE after execution. Return an integer which is
** the result code. Write any error message text into *pzErrMsg.
*/
int sqlite3VdbeFinalize(Vdbe *p){
int rc = SQLITE_OK;
assert( VDBE_RUN_STATE>VDBE_READY_STATE );
assert( VDBE_HALT_STATE>VDBE_READY_STATE );
assert( VDBE_INIT_STATE<VDBE_READY_STATE );
if( p->eVdbeState>=VDBE_READY_STATE ){
rc = sqlite3VdbeReset(p);
assert( (rc & p->db->errMask)==rc );
}
sqlite3VdbeDelete(p);
return rc;
}
/*
** If parameter iOp is less than zero, then invoke the destructor for
** all auxiliary data pointers currently cached by the VM passed as
** the first argument.
**
** Or, if iOp is greater than or equal to zero, then the destructor is
** only invoked for those auxiliary data pointers created by the user
** function invoked by the OP_Function opcode at instruction iOp of
** VM pVdbe, and only then if:
**
** * the associated function parameter is the 32nd or later (counting
** from left to right), or
**
** * the corresponding bit in argument mask is clear (where the first
** function parameter corresponds to bit 0 etc.).
*/
void sqlite3VdbeDeleteAuxData(sqlite3 *db, AuxData **pp, int iOp, int mask){
while( *pp ){
AuxData *pAux = *pp;
if( (iOp<0)
|| (pAux->iAuxOp==iOp
&& pAux->iAuxArg>=0
&& (pAux->iAuxArg>31 || !(mask & MASKBIT32(pAux->iAuxArg))))
){
testcase( pAux->iAuxArg==31 );
if( pAux->xDeleteAux ){
pAux->xDeleteAux(pAux->pAux);
}
*pp = pAux->pNextAux;
sqlite3DbFree(db, pAux);
}else{
pp= &pAux->pNextAux;
}
}
}
/*
** Free all memory associated with the Vdbe passed as the second argument,
** except for object itself, which is preserved.
**
** The difference between this function and sqlite3VdbeDelete() is that
** VdbeDelete() also unlinks the Vdbe from the list of VMs associated with
** the database connection and frees the object itself.
*/
static void sqlite3VdbeClearObject(sqlite3 *db, Vdbe *p){
SubProgram *pSub, *pNext;
assert( db!=0 );
assert( p->db==0 || p->db==db );
if( p->aColName ){
releaseMemArray(p->aColName, p->nResColumn*COLNAME_N);
sqlite3DbNNFreeNN(db, p->aColName);
}
for(pSub=p->pProgram; pSub; pSub=pNext){
pNext = pSub->pNext;
vdbeFreeOpArray(db, pSub->aOp, pSub->nOp);
sqlite3DbFree(db, pSub);
}
if( p->eVdbeState!=VDBE_INIT_STATE ){
releaseMemArray(p->aVar, p->nVar);
if( p->pVList ) sqlite3DbNNFreeNN(db, p->pVList);
if( p->pFree ) sqlite3DbNNFreeNN(db, p->pFree);
}
vdbeFreeOpArray(db, p->aOp, p->nOp);
if( p->zSql ) sqlite3DbNNFreeNN(db, p->zSql);
#ifdef SQLITE_ENABLE_NORMALIZE
sqlite3DbFree(db, p->zNormSql);
{
DblquoteStr *pThis, *pNext;
for(pThis=p->pDblStr; pThis; pThis=pNext){
pNext = pThis->pNextStr;
sqlite3DbFree(db, pThis);
}
}
#endif
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
{
int i;
for(i=0; i<p->nScan; i++){
sqlite3DbFree(db, p->aScan[i].zName);
}
sqlite3DbFree(db, p->aScan);
}
#endif
}
/*
** Delete an entire VDBE.
*/
void sqlite3VdbeDelete(Vdbe *p){
sqlite3 *db;
assert( p!=0 );
db = p->db;
assert( db!=0 );
assert( sqlite3_mutex_held(db->mutex) );
sqlite3VdbeClearObject(db, p);
if( db->pnBytesFreed==0 ){
assert( p->ppVPrev!=0 );
*p->ppVPrev = p->pVNext;
if( p->pVNext ){
p->pVNext->ppVPrev = p->ppVPrev;
}
}
sqlite3DbNNFreeNN(db, p);
}
/*
** The cursor "p" has a pending seek operation that has not yet been
** carried out. Seek the cursor now. If an error occurs, return
** the appropriate error code.
*/
int SQLITE_NOINLINE sqlite3VdbeFinishMoveto(VdbeCursor *p){
int res, rc;
#ifdef SQLITE_TEST
extern int sqlite3_search_count;
#endif
assert( p->deferredMoveto );
assert( p->isTable );
assert( p->eCurType==CURTYPE_BTREE );
rc = sqlite3BtreeTableMoveto(p->uc.pCursor, p->movetoTarget, 0, &res);
if( rc ) return rc;
if( res!=0 ) return SQLITE_CORRUPT_BKPT;
#ifdef SQLITE_TEST
sqlite3_search_count++;
#endif
p->deferredMoveto = 0;
p->cacheStatus = CACHE_STALE;
return SQLITE_OK;
}
/*
** Something has moved cursor "p" out of place. Maybe the row it was
** pointed to was deleted out from under it. Or maybe the btree was
** rebalanced. Whatever the cause, try to restore "p" to the place it
** is supposed to be pointing. If the row was deleted out from under the
** cursor, set the cursor to point to a NULL row.
*/
int SQLITE_NOINLINE sqlite3VdbeHandleMovedCursor(VdbeCursor *p){
int isDifferentRow, rc;
assert( p->eCurType==CURTYPE_BTREE );
assert( p->uc.pCursor!=0 );
assert( sqlite3BtreeCursorHasMoved(p->uc.pCursor) );
rc = sqlite3BtreeCursorRestore(p->uc.pCursor, &isDifferentRow);
p->cacheStatus = CACHE_STALE;
if( isDifferentRow ) p->nullRow = 1;
return rc;
}
/*
** Check to ensure that the cursor is valid. Restore the cursor
** if need be. Return any I/O error from the restore operation.
*/
int sqlite3VdbeCursorRestore(VdbeCursor *p){
assert( p->eCurType==CURTYPE_BTREE || IsNullCursor(p) );
if( sqlite3BtreeCursorHasMoved(p->uc.pCursor) ){
return sqlite3VdbeHandleMovedCursor(p);
}
return SQLITE_OK;
}
/*
** The following functions:
**
** sqlite3VdbeSerialType()
** sqlite3VdbeSerialTypeLen()
** sqlite3VdbeSerialLen()
** sqlite3VdbeSerialPut() <--- in-lined into OP_MakeRecord as of 2022-04-02
** sqlite3VdbeSerialGet()
**
** encapsulate the code that serializes values for storage in SQLite
** data and index records. Each serialized value consists of a
** 'serial-type' and a blob of data. The serial type is an 8-byte unsigned
** integer, stored as a varint.
**
** In an SQLite index record, the serial type is stored directly before
** the blob of data that it corresponds to. In a table record, all serial
** types are stored at the start of the record, and the blobs of data at
** the end. Hence these functions allow the caller to handle the
** serial-type and data blob separately.
**
** The following table describes the various storage classes for data:
**
** serial type bytes of data type
** -------------- --------------- ---------------
** 0 0 NULL
** 1 1 signed integer
** 2 2 signed integer
** 3 3 signed integer
** 4 4 signed integer
** 5 6 signed integer
** 6 8 signed integer
** 7 8 IEEE float
** 8 0 Integer constant 0
** 9 0 Integer constant 1
** 10,11 reserved for expansion
** N>=12 and even (N-12)/2 BLOB
** N>=13 and odd (N-13)/2 text
**
** The 8 and 9 types were added in 3.3.0, file format 4. Prior versions
** of SQLite will not understand those serial types.
*/
#if 0 /* Inlined into the OP_MakeRecord opcode */
/*
** Return the serial-type for the value stored in pMem.
**
** This routine might convert a large MEM_IntReal value into MEM_Real.
**
** 2019-07-11: The primary user of this subroutine was the OP_MakeRecord
** opcode in the byte-code engine. But by moving this routine in-line, we
** can omit some redundant tests and make that opcode a lot faster. So
** this routine is now only used by the STAT3 logic and STAT3 support has
** ended. The code is kept here for historical reference only.
*/
u32 sqlite3VdbeSerialType(Mem *pMem, int file_format, u32 *pLen){
int flags = pMem->flags;
u32 n;
assert( pLen!=0 );
if( flags&MEM_Null ){
*pLen = 0;
return 0;
}
if( flags&(MEM_Int|MEM_IntReal) ){
/* Figure out whether to use 1, 2, 4, 6 or 8 bytes. */
# define MAX_6BYTE ((((i64)0x00008000)<<32)-1)
i64 i = pMem->u.i;
u64 u;
testcase( flags & MEM_Int );
testcase( flags & MEM_IntReal );
if( i<0 ){
u = ~i;
}else{
u = i;
}
if( u<=127 ){
if( (i&1)==i && file_format>=4 ){
*pLen = 0;
return 8+(u32)u;
}else{
*pLen = 1;
return 1;
}
}
if( u<=32767 ){ *pLen = 2; return 2; }
if( u<=8388607 ){ *pLen = 3; return 3; }
if( u<=2147483647 ){ *pLen = 4; return 4; }
if( u<=MAX_6BYTE ){ *pLen = 6; return 5; }
*pLen = 8;
if( flags&MEM_IntReal ){
/* If the value is IntReal and is going to take up 8 bytes to store
** as an integer, then we might as well make it an 8-byte floating
** point value */
pMem->u.r = (double)pMem->u.i;
pMem->flags &= ~MEM_IntReal;
pMem->flags |= MEM_Real;
return 7;
}
return 6;
}
if( flags&MEM_Real ){
*pLen = 8;
return 7;
}
assert( pMem->db->mallocFailed || flags&(MEM_Str|MEM_Blob) );
assert( pMem->n>=0 );
n = (u32)pMem->n;
if( flags & MEM_Zero ){
n += pMem->u.nZero;
}
*pLen = n;
return ((n*2) + 12 + ((flags&MEM_Str)!=0));
}
#endif /* inlined into OP_MakeRecord */
/*
** The sizes for serial types less than 128
*/
const u8 sqlite3SmallTypeSizes[128] = {
/* 0 1 2 3 4 5 6 7 8 9 */
/* 0 */ 0, 1, 2, 3, 4, 6, 8, 8, 0, 0,
/* 10 */ 0, 0, 0, 0, 1, 1, 2, 2, 3, 3,
/* 20 */ 4, 4, 5, 5, 6, 6, 7, 7, 8, 8,
/* 30 */ 9, 9, 10, 10, 11, 11, 12, 12, 13, 13,
/* 40 */ 14, 14, 15, 15, 16, 16, 17, 17, 18, 18,
/* 50 */ 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
/* 60 */ 24, 24, 25, 25, 26, 26, 27, 27, 28, 28,
/* 70 */ 29, 29, 30, 30, 31, 31, 32, 32, 33, 33,
/* 80 */ 34, 34, 35, 35, 36, 36, 37, 37, 38, 38,
/* 90 */ 39, 39, 40, 40, 41, 41, 42, 42, 43, 43,
/* 100 */ 44, 44, 45, 45, 46, 46, 47, 47, 48, 48,
/* 110 */ 49, 49, 50, 50, 51, 51, 52, 52, 53, 53,
/* 120 */ 54, 54, 55, 55, 56, 56, 57, 57
};
/*
** Return the length of the data corresponding to the supplied serial-type.
*/
u32 sqlite3VdbeSerialTypeLen(u32 serial_type){
if( serial_type>=128 ){
return (serial_type-12)/2;
}else{
assert( serial_type<12
|| sqlite3SmallTypeSizes[serial_type]==(serial_type - 12)/2 );
return sqlite3SmallTypeSizes[serial_type];
}
}
u8 sqlite3VdbeOneByteSerialTypeLen(u8 serial_type){
assert( serial_type<128 );
return sqlite3SmallTypeSizes[serial_type];
}
/*
** If we are on an architecture with mixed-endian floating
** points (ex: ARM7) then swap the lower 4 bytes with the
** upper 4 bytes. Return the result.
**
** For most architectures, this is a no-op.
**
** (later): It is reported to me that the mixed-endian problem
** on ARM7 is an issue with GCC, not with the ARM7 chip. It seems
** that early versions of GCC stored the two words of a 64-bit
** float in the wrong order. And that error has been propagated
** ever since. The blame is not necessarily with GCC, though.
** GCC might have just copying the problem from a prior compiler.
** I am also told that newer versions of GCC that follow a different
** ABI get the byte order right.
**
** Developers using SQLite on an ARM7 should compile and run their
** application using -DSQLITE_DEBUG=1 at least once. With DEBUG
** enabled, some asserts below will ensure that the byte order of
** floating point values is correct.
**
** (2007-08-30) Frank van Vugt has studied this problem closely
** and has send his findings to the SQLite developers. Frank
** writes that some Linux kernels offer floating point hardware
** emulation that uses only 32-bit mantissas instead of a full
** 48-bits as required by the IEEE standard. (This is the
** CONFIG_FPE_FASTFPE option.) On such systems, floating point
** byte swapping becomes very complicated. To avoid problems,
** the necessary byte swapping is carried out using a 64-bit integer
** rather than a 64-bit float. Frank assures us that the code here
** works for him. We, the developers, have no way to independently
** verify this, but Frank seems to know what he is talking about
** so we trust him.
*/
#ifdef SQLITE_MIXED_ENDIAN_64BIT_FLOAT
u64 sqlite3FloatSwap(u64 in){
union {
u64 r;
u32 i[2];
} u;
u32 t;
u.r = in;
t = u.i[0];
u.i[0] = u.i[1];
u.i[1] = t;
return u.r;
}
#endif /* SQLITE_MIXED_ENDIAN_64BIT_FLOAT */
/* Input "x" is a sequence of unsigned characters that represent a
** big-endian integer. Return the equivalent native integer
*/
#define ONE_BYTE_INT(x) ((i8)(x)[0])
#define TWO_BYTE_INT(x) (256*(i8)((x)[0])|(x)[1])
#define THREE_BYTE_INT(x) (65536*(i8)((x)[0])|((x)[1]<<8)|(x)[2])
#define FOUR_BYTE_UINT(x) (((u32)(x)[0]<<24)|((x)[1]<<16)|((x)[2]<<8)|(x)[3])
#define FOUR_BYTE_INT(x) (16777216*(i8)((x)[0])|((x)[1]<<16)|((x)[2]<<8)|(x)[3])
/*
** Deserialize the data blob pointed to by buf as serial type serial_type
** and store the result in pMem.
**
** This function is implemented as two separate routines for performance.
** The few cases that require local variables are broken out into a separate
** routine so that in most cases the overhead of moving the stack pointer
** is avoided.
*/
static void serialGet(
const unsigned char *buf, /* Buffer to deserialize from */
u32 serial_type, /* Serial type to deserialize */
Mem *pMem /* Memory cell to write value into */
){
u64 x = FOUR_BYTE_UINT(buf);
u32 y = FOUR_BYTE_UINT(buf+4);
x = (x<<32) + y;
if( serial_type==6 ){
/* EVIDENCE-OF: R-29851-52272 Value is a big-endian 64-bit
** twos-complement integer. */
pMem->u.i = *(i64*)&x;
pMem->flags = MEM_Int;
testcase( pMem->u.i<0 );
}else{
/* EVIDENCE-OF: R-57343-49114 Value is a big-endian IEEE 754-2008 64-bit
** floating point number. */
#if !defined(NDEBUG) && !defined(SQLITE_OMIT_FLOATING_POINT)
/* Verify that integers and floating point values use the same
** byte order. Or, that if SQLITE_MIXED_ENDIAN_64BIT_FLOAT is
** defined that 64-bit floating point values really are mixed
** endian.
*/
static const u64 t1 = ((u64)0x3ff00000)<<32;
static const double r1 = 1.0;
u64 t2 = t1;
swapMixedEndianFloat(t2);
assert( sizeof(r1)==sizeof(t2) && memcmp(&r1, &t2, sizeof(r1))==0 );
#endif
assert( sizeof(x)==8 && sizeof(pMem->u.r)==8 );
swapMixedEndianFloat(x);
memcpy(&pMem->u.r, &x, sizeof(x));
pMem->flags = IsNaN(x) ? MEM_Null : MEM_Real;
}
}
void sqlite3VdbeSerialGet(
const unsigned char *buf, /* Buffer to deserialize from */
u32 serial_type, /* Serial type to deserialize */
Mem *pMem /* Memory cell to write value into */
){
switch( serial_type ){
case 10: { /* Internal use only: NULL with virtual table
** UPDATE no-change flag set */
pMem->flags = MEM_Null|MEM_Zero;
pMem->n = 0;
pMem->u.nZero = 0;
return;
}
case 11: /* Reserved for future use */
case 0: { /* Null */
/* EVIDENCE-OF: R-24078-09375 Value is a NULL. */
pMem->flags = MEM_Null;
return;
}
case 1: {
/* EVIDENCE-OF: R-44885-25196 Value is an 8-bit twos-complement
** integer. */
pMem->u.i = ONE_BYTE_INT(buf);
pMem->flags = MEM_Int;
testcase( pMem->u.i<0 );
return;
}
case 2: { /* 2-byte signed integer */
/* EVIDENCE-OF: R-49794-35026 Value is a big-endian 16-bit
** twos-complement integer. */
pMem->u.i = TWO_BYTE_INT(buf);
pMem->flags = MEM_Int;
testcase( pMem->u.i<0 );
return;
}
case 3: { /* 3-byte signed integer */
/* EVIDENCE-OF: R-37839-54301 Value is a big-endian 24-bit
** twos-complement integer. */
pMem->u.i = THREE_BYTE_INT(buf);
pMem->flags = MEM_Int;
testcase( pMem->u.i<0 );
return;
}
case 4: { /* 4-byte signed integer */
/* EVIDENCE-OF: R-01849-26079 Value is a big-endian 32-bit
** twos-complement integer. */
pMem->u.i = FOUR_BYTE_INT(buf);
#ifdef __HP_cc
/* Work around a sign-extension bug in the HP compiler for HP/UX */
if( buf[0]&0x80 ) pMem->u.i |= 0xffffffff80000000LL;
#endif
pMem->flags = MEM_Int;
testcase( pMem->u.i<0 );
return;
}
case 5: { /* 6-byte signed integer */
/* EVIDENCE-OF: R-50385-09674 Value is a big-endian 48-bit
** twos-complement integer. */
pMem->u.i = FOUR_BYTE_UINT(buf+2) + (((i64)1)<<32)*TWO_BYTE_INT(buf);
pMem->flags = MEM_Int;
testcase( pMem->u.i<0 );
return;
}
case 6: /* 8-byte signed integer */
case 7: { /* IEEE floating point */
/* These use local variables, so do them in a separate routine
** to avoid having to move the frame pointer in the common case */
serialGet(buf,serial_type,pMem);
return;
}
case 8: /* Integer 0 */
case 9: { /* Integer 1 */
/* EVIDENCE-OF: R-12976-22893 Value is the integer 0. */
/* EVIDENCE-OF: R-18143-12121 Value is the integer 1. */
pMem->u.i = serial_type-8;
pMem->flags = MEM_Int;
return;
}
default: {
/* EVIDENCE-OF: R-14606-31564 Value is a BLOB that is (N-12)/2 bytes in
** length.
** EVIDENCE-OF: R-28401-00140 Value is a string in the text encoding and
** (N-13)/2 bytes in length. */
static const u16 aFlag[] = { MEM_Blob|MEM_Ephem, MEM_Str|MEM_Ephem };
pMem->z = (char *)buf;
pMem->n = (serial_type-12)/2;
pMem->flags = aFlag[serial_type&1];
return;
}
}
return;
}
/*
** This routine is used to allocate sufficient space for an UnpackedRecord
** structure large enough to be used with sqlite3VdbeRecordUnpack() if
** the first argument is a pointer to KeyInfo structure pKeyInfo.
**
** The space is either allocated using sqlite3DbMallocRaw() or from within
** the unaligned buffer passed via the second and third arguments (presumably
** stack space). If the former, then *ppFree is set to a pointer that should
** be eventually freed by the caller using sqlite3DbFree(). Or, if the
** allocation comes from the pSpace/szSpace buffer, *ppFree is set to NULL
** before returning.
**
** If an OOM error occurs, NULL is returned.
*/
UnpackedRecord *sqlite3VdbeAllocUnpackedRecord(
KeyInfo *pKeyInfo /* Description of the record */
){
UnpackedRecord *p; /* Unpacked record to return */
int nByte; /* Number of bytes required for *p */
nByte = ROUND8P(sizeof(UnpackedRecord)) + sizeof(Mem)*(pKeyInfo->nKeyField+1);
p = (UnpackedRecord *)sqlite3DbMallocRaw(pKeyInfo->db, nByte);
if( !p ) return 0;
p->aMem = (Mem*)&((char*)p)[ROUND8P(sizeof(UnpackedRecord))];
assert( pKeyInfo->aSortFlags!=0 );
p->pKeyInfo = pKeyInfo;
p->nField = pKeyInfo->nKeyField + 1;
return p;
}
/*
** Given the nKey-byte encoding of a record in pKey[], populate the
** UnpackedRecord structure indicated by the fourth argument with the
** contents of the decoded record.
*/
void sqlite3VdbeRecordUnpack(
KeyInfo *pKeyInfo, /* Information about the record format */
int nKey, /* Size of the binary record */
const void *pKey, /* The binary record */
UnpackedRecord *p /* Populate this structure before returning. */
){
const unsigned char *aKey = (const unsigned char *)pKey;
u32 d;
u32 idx; /* Offset in aKey[] to read from */
u16 u; /* Unsigned loop counter */
u32 szHdr;
Mem *pMem = p->aMem;
p->default_rc = 0;
assert( EIGHT_BYTE_ALIGNMENT(pMem) );
idx = getVarint32(aKey, szHdr);
d = szHdr;
u = 0;
while( idx<szHdr && d<=(u32)nKey ){
u32 serial_type;
idx += getVarint32(&aKey[idx], serial_type);
pMem->enc = pKeyInfo->enc;
pMem->db = pKeyInfo->db;
/* pMem->flags = 0; // sqlite3VdbeSerialGet() will set this for us */
pMem->szMalloc = 0;
pMem->z = 0;
sqlite3VdbeSerialGet(&aKey[d], serial_type, pMem);
d += sqlite3VdbeSerialTypeLen(serial_type);
pMem++;
if( (++u)>=p->nField ) break;
}
if( d>(u32)nKey && u ){
assert( CORRUPT_DB );
/* In a corrupt record entry, the last pMem might have been set up using
** uninitialized memory. Overwrite its value with NULL, to prevent
** warnings from MSAN. */
sqlite3VdbeMemSetNull(pMem-1);
}
assert( u<=pKeyInfo->nKeyField + 1 );
p->nField = u;
}
#ifdef SQLITE_DEBUG
/*
** This function compares two index or table record keys in the same way
** as the sqlite3VdbeRecordCompare() routine. Unlike VdbeRecordCompare(),
** this function deserializes and compares values using the
** sqlite3VdbeSerialGet() and sqlite3MemCompare() functions. It is used
** in assert() statements to ensure that the optimized code in
** sqlite3VdbeRecordCompare() returns results with these two primitives.
**
** Return true if the result of comparison is equivalent to desiredResult.
** Return false if there is a disagreement.
*/
static int vdbeRecordCompareDebug(
int nKey1, const void *pKey1, /* Left key */
const UnpackedRecord *pPKey2, /* Right key */
int desiredResult /* Correct answer */
){
u32 d1; /* Offset into aKey[] of next data element */
u32 idx1; /* Offset into aKey[] of next header element */
u32 szHdr1; /* Number of bytes in header */
int i = 0;
int rc = 0;
const unsigned char *aKey1 = (const unsigned char *)pKey1;
KeyInfo *pKeyInfo;
Mem mem1;
pKeyInfo = pPKey2->pKeyInfo;
if( pKeyInfo->db==0 ) return 1;
mem1.enc = pKeyInfo->enc;
mem1.db = pKeyInfo->db;
/* mem1.flags = 0; // Will be initialized by sqlite3VdbeSerialGet() */
VVA_ONLY( mem1.szMalloc = 0; ) /* Only needed by assert() statements */
/* Compilers may complain that mem1.u.i is potentially uninitialized.
** We could initialize it, as shown here, to silence those complaints.
** But in fact, mem1.u.i will never actually be used uninitialized, and doing
** the unnecessary initialization has a measurable negative performance
** impact, since this routine is a very high runner. And so, we choose
** to ignore the compiler warnings and leave this variable uninitialized.
*/
/* mem1.u.i = 0; // not needed, here to silence compiler warning */
idx1 = getVarint32(aKey1, szHdr1);
if( szHdr1>98307 ) return SQLITE_CORRUPT;
d1 = szHdr1;
assert( pKeyInfo->nAllField>=pPKey2->nField || CORRUPT_DB );
assert( pKeyInfo->aSortFlags!=0 );
assert( pKeyInfo->nKeyField>0 );
assert( idx1<=szHdr1 || CORRUPT_DB );
do{
u32 serial_type1;
/* Read the serial types for the next element in each key. */
idx1 += getVarint32( aKey1+idx1, serial_type1 );
/* Verify that there is enough key space remaining to avoid
** a buffer overread. The "d1+serial_type1+2" subexpression will
** always be greater than or equal to the amount of required key space.
** Use that approximation to avoid the more expensive call to
** sqlite3VdbeSerialTypeLen() in the common case.
*/
if( d1+(u64)serial_type1+2>(u64)nKey1
&& d1+(u64)sqlite3VdbeSerialTypeLen(serial_type1)>(u64)nKey1
){
break;
}
/* Extract the values to be compared.
*/
sqlite3VdbeSerialGet(&aKey1[d1], serial_type1, &mem1);
d1 += sqlite3VdbeSerialTypeLen(serial_type1);
/* Do the comparison
*/
rc = sqlite3MemCompare(&mem1, &pPKey2->aMem[i],
pKeyInfo->nAllField>i ? pKeyInfo->aColl[i] : 0);
if( rc!=0 ){
assert( mem1.szMalloc==0 ); /* See comment below */
if( (pKeyInfo->aSortFlags[i] & KEYINFO_ORDER_BIGNULL)
&& ((mem1.flags & MEM_Null) || (pPKey2->aMem[i].flags & MEM_Null))
){
rc = -rc;
}
if( pKeyInfo->aSortFlags[i] & KEYINFO_ORDER_DESC ){
rc = -rc; /* Invert the result for DESC sort order. */
}
goto debugCompareEnd;
}
i++;
}while( idx1<szHdr1 && i<pPKey2->nField );
/* No memory allocation is ever used on mem1. Prove this using
** the following assert(). If the assert() fails, it indicates a
** memory leak and a need to call sqlite3VdbeMemRelease(&mem1).
*/
assert( mem1.szMalloc==0 );
/* rc==0 here means that one of the keys ran out of fields and
** all the fields up to that point were equal. Return the default_rc
** value. */
rc = pPKey2->default_rc;
debugCompareEnd:
if( desiredResult==0 && rc==0 ) return 1;
if( desiredResult<0 && rc<0 ) return 1;
if( desiredResult>0 && rc>0 ) return 1;
if( CORRUPT_DB ) return 1;
if( pKeyInfo->db->mallocFailed ) return 1;
return 0;
}
#endif
#ifdef SQLITE_DEBUG
/*
** Count the number of fields (a.k.a. columns) in the record given by
** pKey,nKey. The verify that this count is less than or equal to the
** limit given by pKeyInfo->nAllField.
**
** If this constraint is not satisfied, it means that the high-speed
** vdbeRecordCompareInt() and vdbeRecordCompareString() routines will
** not work correctly. If this assert() ever fires, it probably means
** that the KeyInfo.nKeyField or KeyInfo.nAllField values were computed
** incorrectly.
*/
static void vdbeAssertFieldCountWithinLimits(
int nKey, const void *pKey, /* The record to verify */
const KeyInfo *pKeyInfo /* Compare size with this KeyInfo */
){
int nField = 0;
u32 szHdr;
u32 idx;
u32 notUsed;
const unsigned char *aKey = (const unsigned char*)pKey;
if( CORRUPT_DB ) return;
idx = getVarint32(aKey, szHdr);
assert( nKey>=0 );
assert( szHdr<=(u32)nKey );
while( idx<szHdr ){
idx += getVarint32(aKey+idx, notUsed);
nField++;
}
assert( nField <= pKeyInfo->nAllField );
}
#else
# define vdbeAssertFieldCountWithinLimits(A,B,C)
#endif
/*
** Both *pMem1 and *pMem2 contain string values. Compare the two values
** using the collation sequence pColl. As usual, return a negative , zero
** or positive value if *pMem1 is less than, equal to or greater than
** *pMem2, respectively. Similar in spirit to "rc = (*pMem1) - (*pMem2);".
*/
static int vdbeCompareMemString(
const Mem *pMem1,
const Mem *pMem2,
const CollSeq *pColl,
u8 *prcErr /* If an OOM occurs, set to SQLITE_NOMEM */
){
if( pMem1->enc==pColl->enc ){
/* The strings are already in the correct encoding. Call the
** comparison function directly */
return pColl->xCmp(pColl->pUser,pMem1->n,pMem1->z,pMem2->n,pMem2->z);
}else{
int rc;
const void *v1, *v2;
Mem c1;
Mem c2;
sqlite3VdbeMemInit(&c1, pMem1->db, MEM_Null);
sqlite3VdbeMemInit(&c2, pMem1->db, MEM_Null);
sqlite3VdbeMemShallowCopy(&c1, pMem1, MEM_Ephem);
sqlite3VdbeMemShallowCopy(&c2, pMem2, MEM_Ephem);
v1 = sqlite3ValueText((sqlite3_value*)&c1, pColl->enc);
v2 = sqlite3ValueText((sqlite3_value*)&c2, pColl->enc);
if( (v1==0 || v2==0) ){
if( prcErr ) *prcErr = SQLITE_NOMEM_BKPT;
rc = 0;
}else{
rc = pColl->xCmp(pColl->pUser, c1.n, v1, c2.n, v2);
}
sqlite3VdbeMemReleaseMalloc(&c1);
sqlite3VdbeMemReleaseMalloc(&c2);
return rc;
}
}
/*
** The input pBlob is guaranteed to be a Blob that is not marked
** with MEM_Zero. Return true if it could be a zero-blob.
*/
static int isAllZero(const char *z, int n){
int i;
for(i=0; i<n; i++){
if( z[i] ) return 0;
}
return 1;
}
/*
** Compare two blobs. Return negative, zero, or positive if the first
** is less than, equal to, or greater than the second, respectively.
** If one blob is a prefix of the other, then the shorter is the lessor.
*/
SQLITE_NOINLINE int sqlite3BlobCompare(const Mem *pB1, const Mem *pB2){
int c;
int n1 = pB1->n;
int n2 = pB2->n;
/* It is possible to have a Blob value that has some non-zero content
** followed by zero content. But that only comes up for Blobs formed
** by the OP_MakeRecord opcode, and such Blobs never get passed into
** sqlite3MemCompare(). */
assert( (pB1->flags & MEM_Zero)==0 || n1==0 );
assert( (pB2->flags & MEM_Zero)==0 || n2==0 );
if( (pB1->flags|pB2->flags) & MEM_Zero ){
if( pB1->flags & pB2->flags & MEM_Zero ){
return pB1->u.nZero - pB2->u.nZero;
}else if( pB1->flags & MEM_Zero ){
if( !isAllZero(pB2->z, pB2->n) ) return -1;
return pB1->u.nZero - n2;
}else{
if( !isAllZero(pB1->z, pB1->n) ) return +1;
return n1 - pB2->u.nZero;
}
}
c = memcmp(pB1->z, pB2->z, n1>n2 ? n2 : n1);
if( c ) return c;
return n1 - n2;
}
/*
** Do a comparison between a 64-bit signed integer and a 64-bit floating-point
** number. Return negative, zero, or positive if the first (i64) is less than,
** equal to, or greater than the second (double).
*/
int sqlite3IntFloatCompare(i64 i, double r){
if( sizeof(LONGDOUBLE_TYPE)>8 ){
LONGDOUBLE_TYPE x = (LONGDOUBLE_TYPE)i;
testcase( x<r );
testcase( x>r );
testcase( x==r );
if( x<r ) return -1;
if( x>r ) return +1; /*NO_TEST*/ /* work around bugs in gcov */
return 0; /*NO_TEST*/ /* work around bugs in gcov */
}else{
i64 y;
double s;
if( r<-9223372036854775808.0 ) return +1;
if( r>=9223372036854775808.0 ) return -1;
y = (i64)r;
if( i<y ) return -1;
if( i>y ) return +1;
s = (double)i;
if( s<r ) return -1;
if( s>r ) return +1;
return 0;
}
}
/*
** Compare the values contained by the two memory cells, returning
** negative, zero or positive if pMem1 is less than, equal to, or greater
** than pMem2. Sorting order is NULL's first, followed by numbers (integers
** and reals) sorted numerically, followed by text ordered by the collating
** sequence pColl and finally blob's ordered by memcmp().
**
** Two NULL values are considered equal by this function.
*/
int sqlite3MemCompare(const Mem *pMem1, const Mem *pMem2, const CollSeq *pColl){
int f1, f2;
int combined_flags;
f1 = pMem1->flags;
f2 = pMem2->flags;
combined_flags = f1|f2;
assert( !sqlite3VdbeMemIsRowSet(pMem1) && !sqlite3VdbeMemIsRowSet(pMem2) );
/* If one value is NULL, it is less than the other. If both values
** are NULL, return 0.
*/
if( combined_flags&MEM_Null ){
return (f2&MEM_Null) - (f1&MEM_Null);
}
/* At least one of the two values is a number
*/
if( combined_flags&(MEM_Int|MEM_Real|MEM_IntReal) ){
testcase( combined_flags & MEM_Int );
testcase( combined_flags & MEM_Real );
testcase( combined_flags & MEM_IntReal );
if( (f1 & f2 & (MEM_Int|MEM_IntReal))!=0 ){
testcase( f1 & f2 & MEM_Int );
testcase( f1 & f2 & MEM_IntReal );
if( pMem1->u.i < pMem2->u.i ) return -1;
if( pMem1->u.i > pMem2->u.i ) return +1;
return 0;
}
if( (f1 & f2 & MEM_Real)!=0 ){
if( pMem1->u.r < pMem2->u.r ) return -1;
if( pMem1->u.r > pMem2->u.r ) return +1;
return 0;
}
if( (f1&(MEM_Int|MEM_IntReal))!=0 ){
testcase( f1 & MEM_Int );
testcase( f1 & MEM_IntReal );
if( (f2&MEM_Real)!=0 ){
return sqlite3IntFloatCompare(pMem1->u.i, pMem2->u.r);
}else if( (f2&(MEM_Int|MEM_IntReal))!=0 ){
if( pMem1->u.i < pMem2->u.i ) return -1;
if( pMem1->u.i > pMem2->u.i ) return +1;
return 0;
}else{
return -1;
}
}
if( (f1&MEM_Real)!=0 ){
if( (f2&(MEM_Int|MEM_IntReal))!=0 ){
testcase( f2 & MEM_Int );
testcase( f2 & MEM_IntReal );
return -sqlite3IntFloatCompare(pMem2->u.i, pMem1->u.r);
}else{
return -1;
}
}
return +1;
}
/* If one value is a string and the other is a blob, the string is less.
** If both are strings, compare using the collating functions.
*/
if( combined_flags&MEM_Str ){
if( (f1 & MEM_Str)==0 ){
return 1;
}
if( (f2 & MEM_Str)==0 ){
return -1;
}
assert( pMem1->enc==pMem2->enc || pMem1->db->mallocFailed );
assert( pMem1->enc==SQLITE_UTF8 ||
pMem1->enc==SQLITE_UTF16LE || pMem1->enc==SQLITE_UTF16BE );
/* The collation sequence must be defined at this point, even if
** the user deletes the collation sequence after the vdbe program is
** compiled (this was not always the case).
*/
assert( !pColl || pColl->xCmp );
if( pColl ){
return vdbeCompareMemString(pMem1, pMem2, pColl, 0);
}
/* If a NULL pointer was passed as the collate function, fall through
** to the blob case and use memcmp(). */
}
/* Both values must be blobs. Compare using memcmp(). */
return sqlite3BlobCompare(pMem1, pMem2);
}
/*
** The first argument passed to this function is a serial-type that
** corresponds to an integer - all values between 1 and 9 inclusive
** except 7. The second points to a buffer containing an integer value
** serialized according to serial_type. This function deserializes
** and returns the value.
*/
static i64 vdbeRecordDecodeInt(u32 serial_type, const u8 *aKey){
u32 y;
assert( CORRUPT_DB || (serial_type>=1 && serial_type<=9 && serial_type!=7) );
switch( serial_type ){
case 0:
case 1:
testcase( aKey[0]&0x80 );
return ONE_BYTE_INT(aKey);
case 2:
testcase( aKey[0]&0x80 );
return TWO_BYTE_INT(aKey);
case 3:
testcase( aKey[0]&0x80 );
return THREE_BYTE_INT(aKey);
case 4: {
testcase( aKey[0]&0x80 );
y = FOUR_BYTE_UINT(aKey);
return (i64)*(int*)&y;
}
case 5: {
testcase( aKey[0]&0x80 );
return FOUR_BYTE_UINT(aKey+2) + (((i64)1)<<32)*TWO_BYTE_INT(aKey);
}
case 6: {
u64 x = FOUR_BYTE_UINT(aKey);
testcase( aKey[0]&0x80 );
x = (x<<32) | FOUR_BYTE_UINT(aKey+4);
return (i64)*(i64*)&x;
}
}
return (serial_type - 8);
}
/*
** This function compares the two table rows or index records
** specified by {nKey1, pKey1} and pPKey2. It returns a negative, zero
** or positive integer if key1 is less than, equal to or
** greater than key2. The {nKey1, pKey1} key must be a blob
** created by the OP_MakeRecord opcode of the VDBE. The pPKey2
** key must be a parsed key such as obtained from
** sqlite3VdbeParseRecord.
**
** If argument bSkip is non-zero, it is assumed that the caller has already
** determined that the first fields of the keys are equal.
**
** Key1 and Key2 do not have to contain the same number of fields. If all
** fields that appear in both keys are equal, then pPKey2->default_rc is
** returned.
**
** If database corruption is discovered, set pPKey2->errCode to
** SQLITE_CORRUPT and return 0. If an OOM error is encountered,
** pPKey2->errCode is set to SQLITE_NOMEM and, if it is not NULL, the
** malloc-failed flag set on database handle (pPKey2->pKeyInfo->db).
*/
int sqlite3VdbeRecordCompareWithSkip(
int nKey1, const void *pKey1, /* Left key */
UnpackedRecord *pPKey2, /* Right key */
int bSkip /* If true, skip the first field */
){
u32 d1; /* Offset into aKey[] of next data element */
int i; /* Index of next field to compare */
u32 szHdr1; /* Size of record header in bytes */
u32 idx1; /* Offset of first type in header */
int rc = 0; /* Return value */
Mem *pRhs = pPKey2->aMem; /* Next field of pPKey2 to compare */
KeyInfo *pKeyInfo;
const unsigned char *aKey1 = (const unsigned char *)pKey1;
Mem mem1;
/* If bSkip is true, then the caller has already determined that the first
** two elements in the keys are equal. Fix the various stack variables so
** that this routine begins comparing at the second field. */
if( bSkip ){
u32 s1 = aKey1[1];
if( s1<0x80 ){
idx1 = 2;
}else{
idx1 = 1 + sqlite3GetVarint32(&aKey1[1], &s1);
}
szHdr1 = aKey1[0];
d1 = szHdr1 + sqlite3VdbeSerialTypeLen(s1);
i = 1;
pRhs++;
}else{
if( (szHdr1 = aKey1[0])<0x80 ){
idx1 = 1;
}else{
idx1 = sqlite3GetVarint32(aKey1, &szHdr1);
}
d1 = szHdr1;
i = 0;
}
if( d1>(unsigned)nKey1 ){
pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
return 0; /* Corruption */
}
VVA_ONLY( mem1.szMalloc = 0; ) /* Only needed by assert() statements */
assert( pPKey2->pKeyInfo->nAllField>=pPKey2->nField
|| CORRUPT_DB );
assert( pPKey2->pKeyInfo->aSortFlags!=0 );
assert( pPKey2->pKeyInfo->nKeyField>0 );
assert( idx1<=szHdr1 || CORRUPT_DB );
while( 1 /*exit-by-break*/ ){
u32 serial_type;
/* RHS is an integer */
if( pRhs->flags & (MEM_Int|MEM_IntReal) ){
testcase( pRhs->flags & MEM_Int );
testcase( pRhs->flags & MEM_IntReal );
serial_type = aKey1[idx1];
testcase( serial_type==12 );
if( serial_type>=10 ){
rc = serial_type==10 ? -1 : +1;
}else if( serial_type==0 ){
rc = -1;
}else if( serial_type==7 ){
sqlite3VdbeSerialGet(&aKey1[d1], serial_type, &mem1);
rc = -sqlite3IntFloatCompare(pRhs->u.i, mem1.u.r);
}else{
i64 lhs = vdbeRecordDecodeInt(serial_type, &aKey1[d1]);
i64 rhs = pRhs->u.i;
if( lhs<rhs ){
rc = -1;
}else if( lhs>rhs ){
rc = +1;
}
}
}
/* RHS is real */
else if( pRhs->flags & MEM_Real ){
serial_type = aKey1[idx1];
if( serial_type>=10 ){
/* Serial types 12 or greater are strings and blobs (greater than
** numbers). Types 10 and 11 are currently "reserved for future
** use", so it doesn't really matter what the results of comparing
** them to numberic values are. */
rc = serial_type==10 ? -1 : +1;
}else if( serial_type==0 ){
rc = -1;
}else{
sqlite3VdbeSerialGet(&aKey1[d1], serial_type, &mem1);
if( serial_type==7 ){
if( mem1.u.r<pRhs->u.r ){
rc = -1;
}else if( mem1.u.r>pRhs->u.r ){
rc = +1;
}
}else{
rc = sqlite3IntFloatCompare(mem1.u.i, pRhs->u.r);
}
}
}
/* RHS is a string */
else if( pRhs->flags & MEM_Str ){
getVarint32NR(&aKey1[idx1], serial_type);
testcase( serial_type==12 );
if( serial_type<12 ){
rc = -1;
}else if( !(serial_type & 0x01) ){
rc = +1;
}else{
mem1.n = (serial_type - 12) / 2;
testcase( (d1+mem1.n)==(unsigned)nKey1 );
testcase( (d1+mem1.n+1)==(unsigned)nKey1 );
if( (d1+mem1.n) > (unsigned)nKey1
|| (pKeyInfo = pPKey2->pKeyInfo)->nAllField<=i
){
pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
return 0; /* Corruption */
}else if( pKeyInfo->aColl[i] ){
mem1.enc = pKeyInfo->enc;
mem1.db = pKeyInfo->db;
mem1.flags = MEM_Str;
mem1.z = (char*)&aKey1[d1];
rc = vdbeCompareMemString(
&mem1, pRhs, pKeyInfo->aColl[i], &pPKey2->errCode
);
}else{
int nCmp = MIN(mem1.n, pRhs->n);
rc = memcmp(&aKey1[d1], pRhs->z, nCmp);
if( rc==0 ) rc = mem1.n - pRhs->n;
}
}
}
/* RHS is a blob */
else if( pRhs->flags & MEM_Blob ){
assert( (pRhs->flags & MEM_Zero)==0 || pRhs->n==0 );
getVarint32NR(&aKey1[idx1], serial_type);
testcase( serial_type==12 );
if( serial_type<12 || (serial_type & 0x01) ){
rc = -1;
}else{
int nStr = (serial_type - 12) / 2;
testcase( (d1+nStr)==(unsigned)nKey1 );
testcase( (d1+nStr+1)==(unsigned)nKey1 );
if( (d1+nStr) > (unsigned)nKey1 ){
pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
return 0; /* Corruption */
}else if( pRhs->flags & MEM_Zero ){
if( !isAllZero((const char*)&aKey1[d1],nStr) ){
rc = 1;
}else{
rc = nStr - pRhs->u.nZero;
}
}else{
int nCmp = MIN(nStr, pRhs->n);
rc = memcmp(&aKey1[d1], pRhs->z, nCmp);
if( rc==0 ) rc = nStr - pRhs->n;
}
}
}
/* RHS is null */
else{
serial_type = aKey1[idx1];
rc = (serial_type!=0 && serial_type!=10);
}
if( rc!=0 ){
int sortFlags = pPKey2->pKeyInfo->aSortFlags[i];
if( sortFlags ){
if( (sortFlags & KEYINFO_ORDER_BIGNULL)==0
|| ((sortFlags & KEYINFO_ORDER_DESC)
!=(serial_type==0 || (pRhs->flags&MEM_Null)))
){
rc = -rc;
}
}
assert( vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, rc) );
assert( mem1.szMalloc==0 ); /* See comment below */
return rc;
}
i++;
if( i==pPKey2->nField ) break;
pRhs++;
d1 += sqlite3VdbeSerialTypeLen(serial_type);
if( d1>(unsigned)nKey1 ) break;
idx1 += sqlite3VarintLen(serial_type);
if( idx1>=(unsigned)szHdr1 ){
pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
return 0; /* Corrupt index */
}
}
/* No memory allocation is ever used on mem1. Prove this using
** the following assert(). If the assert() fails, it indicates a
** memory leak and a need to call sqlite3VdbeMemRelease(&mem1). */
assert( mem1.szMalloc==0 );
/* rc==0 here means that one or both of the keys ran out of fields and
** all the fields up to that point were equal. Return the default_rc
** value. */
assert( CORRUPT_DB
|| vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, pPKey2->default_rc)
|| pPKey2->pKeyInfo->db->mallocFailed
);
pPKey2->eqSeen = 1;
return pPKey2->default_rc;
}
int sqlite3VdbeRecordCompare(
int nKey1, const void *pKey1, /* Left key */
UnpackedRecord *pPKey2 /* Right key */
){
return sqlite3VdbeRecordCompareWithSkip(nKey1, pKey1, pPKey2, 0);
}
/*
** This function is an optimized version of sqlite3VdbeRecordCompare()
** that (a) the first field of pPKey2 is an integer, and (b) the
** size-of-header varint at the start of (pKey1/nKey1) fits in a single
** byte (i.e. is less than 128).
**
** To avoid concerns about buffer overreads, this routine is only used
** on schemas where the maximum valid header size is 63 bytes or less.
*/
static int vdbeRecordCompareInt(
int nKey1, const void *pKey1, /* Left key */
UnpackedRecord *pPKey2 /* Right key */
){
const u8 *aKey = &((const u8*)pKey1)[*(const u8*)pKey1 & 0x3F];
int serial_type = ((const u8*)pKey1)[1];
int res;
u32 y;
u64 x;
i64 v;
i64 lhs;
vdbeAssertFieldCountWithinLimits(nKey1, pKey1, pPKey2->pKeyInfo);
assert( (*(u8*)pKey1)<=0x3F || CORRUPT_DB );
switch( serial_type ){
case 1: { /* 1-byte signed integer */
lhs = ONE_BYTE_INT(aKey);
testcase( lhs<0 );
break;
}
case 2: { /* 2-byte signed integer */
lhs = TWO_BYTE_INT(aKey);
testcase( lhs<0 );
break;
}
case 3: { /* 3-byte signed integer */
lhs = THREE_BYTE_INT(aKey);
testcase( lhs<0 );
break;
}
case 4: { /* 4-byte signed integer */
y = FOUR_BYTE_UINT(aKey);
lhs = (i64)*(int*)&y;
testcase( lhs<0 );
break;
}
case 5: { /* 6-byte signed integer */
lhs = FOUR_BYTE_UINT(aKey+2) + (((i64)1)<<32)*TWO_BYTE_INT(aKey);
testcase( lhs<0 );
break;
}
case 6: { /* 8-byte signed integer */
x = FOUR_BYTE_UINT(aKey);
x = (x<<32) | FOUR_BYTE_UINT(aKey+4);
lhs = *(i64*)&x;
testcase( lhs<0 );
break;
}
case 8:
lhs = 0;
break;
case 9:
lhs = 1;
break;
/* This case could be removed without changing the results of running
** this code. Including it causes gcc to generate a faster switch
** statement (since the range of switch targets now starts at zero and
** is contiguous) but does not cause any duplicate code to be generated
** (as gcc is clever enough to combine the two like cases). Other
** compilers might be similar. */
case 0: case 7:
return sqlite3VdbeRecordCompare(nKey1, pKey1, pPKey2);
default:
return sqlite3VdbeRecordCompare(nKey1, pKey1, pPKey2);
}
assert( pPKey2->u.i == pPKey2->aMem[0].u.i );
v = pPKey2->u.i;
if( v>lhs ){
res = pPKey2->r1;
}else if( v<lhs ){
res = pPKey2->r2;
}else if( pPKey2->nField>1 ){
/* The first fields of the two keys are equal. Compare the trailing
** fields. */
res = sqlite3VdbeRecordCompareWithSkip(nKey1, pKey1, pPKey2, 1);
}else{
/* The first fields of the two keys are equal and there are no trailing
** fields. Return pPKey2->default_rc in this case. */
res = pPKey2->default_rc;
pPKey2->eqSeen = 1;
}
assert( vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, res) );
return res;
}
/*
** This function is an optimized version of sqlite3VdbeRecordCompare()
** that (a) the first field of pPKey2 is a string, that (b) the first field
** uses the collation sequence BINARY and (c) that the size-of-header varint
** at the start of (pKey1/nKey1) fits in a single byte.
*/
static int vdbeRecordCompareString(
int nKey1, const void *pKey1, /* Left key */
UnpackedRecord *pPKey2 /* Right key */
){
const u8 *aKey1 = (const u8*)pKey1;
int serial_type;
int res;
assert( pPKey2->aMem[0].flags & MEM_Str );
assert( pPKey2->aMem[0].n == pPKey2->n );
assert( pPKey2->aMem[0].z == pPKey2->u.z );
vdbeAssertFieldCountWithinLimits(nKey1, pKey1, pPKey2->pKeyInfo);
serial_type = (signed char)(aKey1[1]);
vrcs_restart:
if( serial_type<12 ){
if( serial_type<0 ){
sqlite3GetVarint32(&aKey1[1], (u32*)&serial_type);
if( serial_type>=12 ) goto vrcs_restart;
assert( CORRUPT_DB );
}
res = pPKey2->r1; /* (pKey1/nKey1) is a number or a null */
}else if( !(serial_type & 0x01) ){
res = pPKey2->r2; /* (pKey1/nKey1) is a blob */
}else{
int nCmp;
int nStr;
int szHdr = aKey1[0];
nStr = (serial_type-12) / 2;
if( (szHdr + nStr) > nKey1 ){
pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT;
return 0; /* Corruption */
}
nCmp = MIN( pPKey2->n, nStr );
res = memcmp(&aKey1[szHdr], pPKey2->u.z, nCmp);
if( res>0 ){
res = pPKey2->r2;
}else if( res<0 ){
res = pPKey2->r1;
}else{
res = nStr - pPKey2->n;
if( res==0 ){
if( pPKey2->nField>1 ){
res = sqlite3VdbeRecordCompareWithSkip(nKey1, pKey1, pPKey2, 1);
}else{
res = pPKey2->default_rc;
pPKey2->eqSeen = 1;
}
}else if( res>0 ){
res = pPKey2->r2;
}else{
res = pPKey2->r1;
}
}
}
assert( vdbeRecordCompareDebug(nKey1, pKey1, pPKey2, res)
|| CORRUPT_DB
|| pPKey2->pKeyInfo->db->mallocFailed
);
return res;
}
/*
** Return a pointer to an sqlite3VdbeRecordCompare() compatible function
** suitable for comparing serialized records to the unpacked record passed
** as the only argument.
*/
RecordCompare sqlite3VdbeFindCompare(UnpackedRecord *p){
/* varintRecordCompareInt() and varintRecordCompareString() both assume
** that the size-of-header varint that occurs at the start of each record
** fits in a single byte (i.e. is 127 or less). varintRecordCompareInt()
** also assumes that it is safe to overread a buffer by at least the
** maximum possible legal header size plus 8 bytes. Because there is
** guaranteed to be at least 74 (but not 136) bytes of padding following each
** buffer passed to varintRecordCompareInt() this makes it convenient to
** limit the size of the header to 64 bytes in cases where the first field
** is an integer.
**
** The easiest way to enforce this limit is to consider only records with
** 13 fields or less. If the first field is an integer, the maximum legal
** header size is (12*5 + 1 + 1) bytes. */
if( p->pKeyInfo->nAllField<=13 ){
int flags = p->aMem[0].flags;
if( p->pKeyInfo->aSortFlags[0] ){
if( p->pKeyInfo->aSortFlags[0] & KEYINFO_ORDER_BIGNULL ){
return sqlite3VdbeRecordCompare;
}
p->r1 = 1;
p->r2 = -1;
}else{
p->r1 = -1;
p->r2 = 1;
}
if( (flags & MEM_Int) ){
p->u.i = p->aMem[0].u.i;
return vdbeRecordCompareInt;
}
testcase( flags & MEM_Real );
testcase( flags & MEM_Null );
testcase( flags & MEM_Blob );
if( (flags & (MEM_Real|MEM_IntReal|MEM_Null|MEM_Blob))==0
&& p->pKeyInfo->aColl[0]==0
){
assert( flags & MEM_Str );
p->u.z = p->aMem[0].z;
p->n = p->aMem[0].n;
return vdbeRecordCompareString;
}
}
return sqlite3VdbeRecordCompare;
}
/*
** pCur points at an index entry created using the OP_MakeRecord opcode.
** Read the rowid (the last field in the record) and store it in *rowid.
** Return SQLITE_OK if everything works, or an error code otherwise.
**
** pCur might be pointing to text obtained from a corrupt database file.
** So the content cannot be trusted. Do appropriate checks on the content.
*/
int sqlite3VdbeIdxRowid(sqlite3 *db, BtCursor *pCur, i64 *rowid){
i64 nCellKey = 0;
int rc;
u32 szHdr; /* Size of the header */
u32 typeRowid; /* Serial type of the rowid */
u32 lenRowid; /* Size of the rowid */
Mem m, v;
/* Get the size of the index entry. Only indices entries of less
** than 2GiB are support - anything large must be database corruption.
** Any corruption is detected in sqlite3BtreeParseCellPtr(), though, so
** this code can safely assume that nCellKey is 32-bits
*/
assert( sqlite3BtreeCursorIsValid(pCur) );
nCellKey = sqlite3BtreePayloadSize(pCur);
assert( (nCellKey & SQLITE_MAX_U32)==(u64)nCellKey );
/* Read in the complete content of the index entry */
sqlite3VdbeMemInit(&m, db, 0);
rc = sqlite3VdbeMemFromBtreeZeroOffset(pCur, (u32)nCellKey, &m);
if( rc ){
return rc;
}
/* The index entry must begin with a header size */
getVarint32NR((u8*)m.z, szHdr);
testcase( szHdr==3 );
testcase( szHdr==(u32)m.n );
testcase( szHdr>0x7fffffff );
assert( m.n>=0 );
if( unlikely(szHdr<3 || szHdr>(unsigned)m.n) ){
goto idx_rowid_corruption;
}
/* The last field of the index should be an integer - the ROWID.
** Verify that the last entry really is an integer. */
getVarint32NR((u8*)&m.z[szHdr-1], typeRowid);
testcase( typeRowid==1 );
testcase( typeRowid==2 );
testcase( typeRowid==3 );
testcase( typeRowid==4 );
testcase( typeRowid==5 );
testcase( typeRowid==6 );
testcase( typeRowid==8 );
testcase( typeRowid==9 );
if( unlikely(typeRowid<1 || typeRowid>9 || typeRowid==7) ){
goto idx_rowid_corruption;
}
lenRowid = sqlite3SmallTypeSizes[typeRowid];
testcase( (u32)m.n==szHdr+lenRowid );
if( unlikely((u32)m.n<szHdr+lenRowid) ){
goto idx_rowid_corruption;
}
/* Fetch the integer off the end of the index record */
sqlite3VdbeSerialGet((u8*)&m.z[m.n-lenRowid], typeRowid, &v);
*rowid = v.u.i;
sqlite3VdbeMemReleaseMalloc(&m);
return SQLITE_OK;
/* Jump here if database corruption is detected after m has been
** allocated. Free the m object and return SQLITE_CORRUPT. */
idx_rowid_corruption:
testcase( m.szMalloc!=0 );
sqlite3VdbeMemReleaseMalloc(&m);
return SQLITE_CORRUPT_BKPT;
}
/*
** Compare the key of the index entry that cursor pC is pointing to against
** the key string in pUnpacked. Write into *pRes a number
** that is negative, zero, or positive if pC is less than, equal to,
** or greater than pUnpacked. Return SQLITE_OK on success.
**
** pUnpacked is either created without a rowid or is truncated so that it
** omits the rowid at the end. The rowid at the end of the index entry
** is ignored as well. Hence, this routine only compares the prefixes
** of the keys prior to the final rowid, not the entire key.
*/
int sqlite3VdbeIdxKeyCompare(
sqlite3 *db, /* Database connection */
VdbeCursor *pC, /* The cursor to compare against */
UnpackedRecord *pUnpacked, /* Unpacked version of key */
int *res /* Write the comparison result here */
){
i64 nCellKey = 0;
int rc;
BtCursor *pCur;
Mem m;
assert( pC->eCurType==CURTYPE_BTREE );
pCur = pC->uc.pCursor;
assert( sqlite3BtreeCursorIsValid(pCur) );
nCellKey = sqlite3BtreePayloadSize(pCur);
/* nCellKey will always be between 0 and 0xffffffff because of the way
** that btreeParseCellPtr() and sqlite3GetVarint32() are implemented */
if( nCellKey<=0 || nCellKey>0x7fffffff ){
*res = 0;
return SQLITE_CORRUPT_BKPT;
}
sqlite3VdbeMemInit(&m, db, 0);
rc = sqlite3VdbeMemFromBtreeZeroOffset(pCur, (u32)nCellKey, &m);
if( rc ){
return rc;
}
*res = sqlite3VdbeRecordCompareWithSkip(m.n, m.z, pUnpacked, 0);
sqlite3VdbeMemReleaseMalloc(&m);
return SQLITE_OK;
}
/*
** This routine sets the value to be returned by subsequent calls to
** sqlite3_changes() on the database handle 'db'.
*/
void sqlite3VdbeSetChanges(sqlite3 *db, i64 nChange){
assert( sqlite3_mutex_held(db->mutex) );
db->nChange = nChange;
db->nTotalChange += nChange;
}
/*
** Set a flag in the vdbe to update the change counter when it is finalised
** or reset.
*/
void sqlite3VdbeCountChanges(Vdbe *v){
v->changeCntOn = 1;
}
/*
** Mark every prepared statement associated with a database connection
** as expired.
**
** An expired statement means that recompilation of the statement is
** recommend. Statements expire when things happen that make their
** programs obsolete. Removing user-defined functions or collating
** sequences, or changing an authorization function are the types of
** things that make prepared statements obsolete.
**
** If iCode is 1, then expiration is advisory. The statement should
** be reprepared before being restarted, but if it is already running
** it is allowed to run to completion.
**
** Internally, this function just sets the Vdbe.expired flag on all
** prepared statements. The flag is set to 1 for an immediate expiration
** and set to 2 for an advisory expiration.
*/
void sqlite3ExpirePreparedStatements(sqlite3 *db, int iCode){
Vdbe *p;
for(p = db->pVdbe; p; p=p->pVNext){
p->expired = iCode+1;
}
}
/*
** Return the database associated with the Vdbe.
*/
sqlite3 *sqlite3VdbeDb(Vdbe *v){
return v->db;
}
/*
** Return the SQLITE_PREPARE flags for a Vdbe.
*/
u8 sqlite3VdbePrepareFlags(Vdbe *v){
return v->prepFlags;
}
/*
** Return a pointer to an sqlite3_value structure containing the value bound
** parameter iVar of VM v. Except, if the value is an SQL NULL, return
** 0 instead. Unless it is NULL, apply affinity aff (one of the SQLITE_AFF_*
** constants) to the value before returning it.
**
** The returned value must be freed by the caller using sqlite3ValueFree().
*/
sqlite3_value *sqlite3VdbeGetBoundValue(Vdbe *v, int iVar, u8 aff){
assert( iVar>0 );
if( v ){
Mem *pMem = &v->aVar[iVar-1];
assert( (v->db->flags & SQLITE_EnableQPSG)==0 );
if( 0==(pMem->flags & MEM_Null) ){
sqlite3_value *pRet = sqlite3ValueNew(v->db);
if( pRet ){
sqlite3VdbeMemCopy((Mem *)pRet, pMem);
sqlite3ValueApplyAffinity(pRet, aff, SQLITE_UTF8);
}
return pRet;
}
}
return 0;
}
/*
** Configure SQL variable iVar so that binding a new value to it signals
** to sqlite3_reoptimize() that re-preparing the statement may result
** in a better query plan.
*/
void sqlite3VdbeSetVarmask(Vdbe *v, int iVar){
assert( iVar>0 );
assert( (v->db->flags & SQLITE_EnableQPSG)==0 );
if( iVar>=32 ){
v->expmask |= 0x80000000;
}else{
v->expmask |= ((u32)1 << (iVar-1));
}
}
/*
** Cause a function to throw an error if it was call from OP_PureFunc
** rather than OP_Function.
**
** OP_PureFunc means that the function must be deterministic, and should
** throw an error if it is given inputs that would make it non-deterministic.
** This routine is invoked by date/time functions that use non-deterministic
** features such as 'now'.
*/
int sqlite3NotPureFunc(sqlite3_context *pCtx){
const VdbeOp *pOp;
#ifdef SQLITE_ENABLE_STAT4
if( pCtx->pVdbe==0 ) return 1;
#endif
pOp = pCtx->pVdbe->aOp + pCtx->iOp;
if( pOp->opcode==OP_PureFunc ){
const char *zContext;
char *zMsg;
if( pOp->p5 & NC_IsCheck ){
zContext = "a CHECK constraint";
}else if( pOp->p5 & NC_GenCol ){
zContext = "a generated column";
}else{
zContext = "an index";
}
zMsg = sqlite3_mprintf("non-deterministic use of %s() in %s",
pCtx->pFunc->zName, zContext);
sqlite3_result_error(pCtx, zMsg, -1);
sqlite3_free(zMsg);
return 0;
}
return 1;
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Transfer error message text from an sqlite3_vtab.zErrMsg (text stored
** in memory obtained from sqlite3_malloc) into a Vdbe.zErrMsg (text stored
** in memory obtained from sqlite3DbMalloc).
*/
void sqlite3VtabImportErrmsg(Vdbe *p, sqlite3_vtab *pVtab){
if( pVtab->zErrMsg ){
sqlite3 *db = p->db;
sqlite3DbFree(db, p->zErrMsg);
p->zErrMsg = sqlite3DbStrDup(db, pVtab->zErrMsg);
sqlite3_free(pVtab->zErrMsg);
pVtab->zErrMsg = 0;
}
}
#endif /* SQLITE_OMIT_VIRTUALTABLE */
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
/*
** If the second argument is not NULL, release any allocations associated
** with the memory cells in the p->aMem[] array. Also free the UnpackedRecord
** structure itself, using sqlite3DbFree().
**
** This function is used to free UnpackedRecord structures allocated by
** the vdbeUnpackRecord() function found in vdbeapi.c.
*/
static void vdbeFreeUnpacked(sqlite3 *db, int nField, UnpackedRecord *p){
assert( db!=0 );
if( p ){
int i;
for(i=0; i<nField; i++){
Mem *pMem = &p->aMem[i];
if( pMem->zMalloc ) sqlite3VdbeMemReleaseMalloc(pMem);
}
sqlite3DbNNFreeNN(db, p);
}
}
#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
/*
** Invoke the pre-update hook. If this is an UPDATE or DELETE pre-update call,
** then cursor passed as the second argument should point to the row about
** to be update or deleted. If the application calls sqlite3_preupdate_old(),
** the required value will be read from the row the cursor points to.
*/
void sqlite3VdbePreUpdateHook(
Vdbe *v, /* Vdbe pre-update hook is invoked by */
VdbeCursor *pCsr, /* Cursor to grab old.* values from */
int op, /* SQLITE_INSERT, UPDATE or DELETE */
const char *zDb, /* Database name */
Table *pTab, /* Modified table */
i64 iKey1, /* Initial key value */
int iReg, /* Register for new.* record */
int iBlobWrite
){
sqlite3 *db = v->db;
i64 iKey2;
PreUpdate preupdate;
const char *zTbl = pTab->zName;
static const u8 fakeSortOrder = 0;
assert( db->pPreUpdate==0 );
memset(&preupdate, 0, sizeof(PreUpdate));
if( HasRowid(pTab)==0 ){
iKey1 = iKey2 = 0;
preupdate.pPk = sqlite3PrimaryKeyIndex(pTab);
}else{
if( op==SQLITE_UPDATE ){
iKey2 = v->aMem[iReg].u.i;
}else{
iKey2 = iKey1;
}
}
assert( pCsr!=0 );
assert( pCsr->eCurType==CURTYPE_BTREE );
assert( pCsr->nField==pTab->nCol
|| (pCsr->nField==pTab->nCol+1 && op==SQLITE_DELETE && iReg==-1)
);
preupdate.v = v;
preupdate.pCsr = pCsr;
preupdate.op = op;
preupdate.iNewReg = iReg;
preupdate.keyinfo.db = db;
preupdate.keyinfo.enc = ENC(db);
preupdate.keyinfo.nKeyField = pTab->nCol;
preupdate.keyinfo.aSortFlags = (u8*)&fakeSortOrder;
preupdate.iKey1 = iKey1;
preupdate.iKey2 = iKey2;
preupdate.pTab = pTab;
preupdate.iBlobWrite = iBlobWrite;
db->pPreUpdate = &preupdate;
db->xPreUpdateCallback(db->pPreUpdateArg, db, op, zDb, zTbl, iKey1, iKey2);
db->pPreUpdate = 0;
sqlite3DbFree(db, preupdate.aRecord);
vdbeFreeUnpacked(db, preupdate.keyinfo.nKeyField+1, preupdate.pUnpacked);
vdbeFreeUnpacked(db, preupdate.keyinfo.nKeyField+1, preupdate.pNewUnpacked);
if( preupdate.aNew ){
int i;
for(i=0; i<pCsr->nField; i++){
sqlite3VdbeMemRelease(&preupdate.aNew[i]);
}
sqlite3DbNNFreeNN(db, preupdate.aNew);
}
}
#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
| 170,531 | 5,326 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/utf.shell.c | #include "third_party/sqlite3/utf.c"
| 37 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/vdbevtab.shell.c | #include "third_party/sqlite3/vdbevtab.c"
| 42 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/decimal.c | /*
** 2020-06-22
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** Routines to implement arbitrary-precision decimal math.
**
** The focus here is on simplicity and correctness, not performance.
*/
#include "libc/assert.h"
#include "libc/mem/mem.h"
#include "libc/str/str.h"
#include "third_party/sqlite3/sqlite3ext.h"
// clang-format off
SQLITE_EXTENSION_INIT1
/* A decimal object */
typedef struct Decimal Decimal;
struct Decimal {
char sign; /* 0 for positive, 1 for negative */
char oom; /* True if an OOM is encountered */
char isNull; /* True if holds a NULL rather than a number */
char isInit; /* True upon initialization */
int nDigit; /* Total number of digits */
int nFrac; /* Number of digits to the right of the decimal point */
signed char *a; /* Array of digits. Most significant first. */
};
/*
** Release memory held by a Decimal, but do not free the object itself.
*/
static void decimal_clear(Decimal *p){
sqlite3_free(p->a);
}
/*
** Destroy a Decimal object
*/
static void decimal_free(Decimal *p){
if( p ){
decimal_clear(p);
sqlite3_free(p);
}
}
/*
** Allocate a new Decimal object. Initialize it to the number given
** by the input string.
*/
static Decimal *decimal_new(
sqlite3_context *pCtx,
sqlite3_value *pIn,
int nAlt,
const unsigned char *zAlt
){
Decimal *p;
int n, i;
const unsigned char *zIn;
int iExp = 0;
p = sqlite3_malloc( sizeof(*p) );
if( p==0 ) goto new_no_mem;
p->sign = 0;
p->oom = 0;
p->isInit = 1;
p->isNull = 0;
p->nDigit = 0;
p->nFrac = 0;
if( zAlt ){
n = nAlt,
zIn = zAlt;
}else{
if( sqlite3_value_type(pIn)==SQLITE_NULL ){
p->a = 0;
p->isNull = 1;
return p;
}
n = sqlite3_value_bytes(pIn);
zIn = sqlite3_value_text(pIn);
}
p->a = sqlite3_malloc64( n+1 );
if( p->a==0 ) goto new_no_mem;
for(i=0; isspace(zIn[i]); i++){}
if( zIn[i]=='-' ){
p->sign = 1;
i++;
}else if( zIn[i]=='+' ){
i++;
}
while( i<n && zIn[i]=='0' ) i++;
while( i<n ){
char c = zIn[i];
if( c>='0' && c<='9' ){
p->a[p->nDigit++] = c - '0';
}else if( c=='.' ){
p->nFrac = p->nDigit + 1;
}else if( c=='e' || c=='E' ){
int j = i+1;
int neg = 0;
if( j>=n ) break;
if( zIn[j]=='-' ){
neg = 1;
j++;
}else if( zIn[j]=='+' ){
j++;
}
while( j<n && iExp<1000000 ){
if( zIn[j]>='0' && zIn[j]<='9' ){
iExp = iExp*10 + zIn[j] - '0';
}
j++;
}
if( neg ) iExp = -iExp;
break;
}
i++;
}
if( p->nFrac ){
p->nFrac = p->nDigit - (p->nFrac - 1);
}
if( iExp>0 ){
if( p->nFrac>0 ){
if( iExp<=p->nFrac ){
p->nFrac -= iExp;
iExp = 0;
}else{
iExp -= p->nFrac;
p->nFrac = 0;
}
}
if( iExp>0 ){
p->a = sqlite3_realloc64(p->a, p->nDigit + iExp + 1 );
if( p->a==0 ) goto new_no_mem;
memset(p->a+p->nDigit, 0, iExp);
p->nDigit += iExp;
}
}else if( iExp<0 ){
int nExtra;
iExp = -iExp;
nExtra = p->nDigit - p->nFrac - 1;
if( nExtra ){
if( nExtra>=iExp ){
p->nFrac += iExp;
iExp = 0;
}else{
iExp -= nExtra;
p->nFrac = p->nDigit - 1;
}
}
if( iExp>0 ){
p->a = sqlite3_realloc64(p->a, p->nDigit + iExp + 1 );
if( p->a==0 ) goto new_no_mem;
memmove(p->a+iExp, p->a, p->nDigit);
memset(p->a, 0, iExp);
p->nDigit += iExp;
p->nFrac += iExp;
}
}
return p;
new_no_mem:
if( pCtx ) sqlite3_result_error_nomem(pCtx);
sqlite3_free(p);
return 0;
}
/*
** Make the given Decimal the result.
*/
static void decimal_result(sqlite3_context *pCtx, Decimal *p){
char *z;
int i, j;
int n;
if( p==0 || p->oom ){
sqlite3_result_error_nomem(pCtx);
return;
}
if( p->isNull ){
sqlite3_result_null(pCtx);
return;
}
z = sqlite3_malloc( p->nDigit+4 );
if( z==0 ){
sqlite3_result_error_nomem(pCtx);
return;
}
i = 0;
if( p->nDigit==0 || (p->nDigit==1 && p->a[0]==0) ){
p->sign = 0;
}
if( p->sign ){
z[0] = '-';
i = 1;
}
n = p->nDigit - p->nFrac;
if( n<=0 ){
z[i++] = '0';
}
j = 0;
while( n>1 && p->a[j]==0 ){
j++;
n--;
}
while( n>0 ){
z[i++] = p->a[j] + '0';
j++;
n--;
}
if( p->nFrac ){
z[i++] = '.';
do{
z[i++] = p->a[j] + '0';
j++;
}while( j<p->nDigit );
}
z[i] = 0;
sqlite3_result_text(pCtx, z, i, sqlite3_free);
}
/*
** SQL Function: decimal(X)
**
** Convert input X into decimal and then back into text
*/
static void decimalFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
Decimal *p = decimal_new(context, argv[0], 0, 0);
decimal_result(context, p);
decimal_free(p);
}
/*
** Compare to Decimal objects. Return negative, 0, or positive if the
** first object is less than, equal to, or greater than the second.
**
** Preconditions for this routine:
**
** pA!=0
** pA->isNull==0
** pB!=0
** pB->isNull==0
*/
static int decimal_cmp(const Decimal *pA, const Decimal *pB){
int nASig, nBSig, rc, n;
if( pA->sign!=pB->sign ){
return pA->sign ? -1 : +1;
}
if( pA->sign ){
const Decimal *pTemp = pA;
pA = pB;
pB = pTemp;
}
nASig = pA->nDigit - pA->nFrac;
nBSig = pB->nDigit - pB->nFrac;
if( nASig!=nBSig ){
return nASig - nBSig;
}
n = pA->nDigit;
if( n>pB->nDigit ) n = pB->nDigit;
rc = memcmp(pA->a, pB->a, n);
if( rc==0 ){
rc = pA->nDigit - pB->nDigit;
}
return rc;
}
/*
** SQL Function: decimal_cmp(X, Y)
**
** Return negative, zero, or positive if X is less then, equal to, or
** greater than Y.
*/
static void decimalCmpFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
Decimal *pA = 0, *pB = 0;
int rc;
pA = decimal_new(context, argv[0], 0, 0);
if( pA==0 || pA->isNull ) goto cmp_done;
pB = decimal_new(context, argv[1], 0, 0);
if( pB==0 || pB->isNull ) goto cmp_done;
rc = decimal_cmp(pA, pB);
if( rc<0 ) rc = -1;
else if( rc>0 ) rc = +1;
sqlite3_result_int(context, rc);
cmp_done:
decimal_free(pA);
decimal_free(pB);
}
/*
** Expand the Decimal so that it has a least nDigit digits and nFrac
** digits to the right of the decimal point.
*/
static void decimal_expand(Decimal *p, int nDigit, int nFrac){
int nAddSig;
int nAddFrac;
if( p==0 ) return;
nAddFrac = nFrac - p->nFrac;
nAddSig = (nDigit - p->nDigit) - nAddFrac;
if( nAddFrac==0 && nAddSig==0 ) return;
p->a = sqlite3_realloc64(p->a, nDigit+1);
if( p->a==0 ){
p->oom = 1;
return;
}
if( nAddSig ){
memmove(p->a+nAddSig, p->a, p->nDigit);
memset(p->a, 0, nAddSig);
p->nDigit += nAddSig;
}
if( nAddFrac ){
memset(p->a+p->nDigit, 0, nAddFrac);
p->nDigit += nAddFrac;
p->nFrac += nAddFrac;
}
}
/*
** Add the value pB into pA.
**
** Both pA and pB might become denormalized by this routine.
*/
static void decimal_add(Decimal *pA, Decimal *pB){
int nSig, nFrac, nDigit;
int i, rc;
if( pA==0 ){
return;
}
if( pA->oom || pB==0 || pB->oom ){
pA->oom = 1;
return;
}
if( pA->isNull || pB->isNull ){
pA->isNull = 1;
return;
}
nSig = pA->nDigit - pA->nFrac;
if( nSig && pA->a[0]==0 ) nSig--;
if( nSig<pB->nDigit-pB->nFrac ){
nSig = pB->nDigit - pB->nFrac;
}
nFrac = pA->nFrac;
if( nFrac<pB->nFrac ) nFrac = pB->nFrac;
nDigit = nSig + nFrac + 1;
decimal_expand(pA, nDigit, nFrac);
decimal_expand(pB, nDigit, nFrac);
if( pA->oom || pB->oom ){
pA->oom = 1;
}else{
if( pA->sign==pB->sign ){
int carry = 0;
for(i=nDigit-1; i>=0; i--){
int x = pA->a[i] + pB->a[i] + carry;
if( x>=10 ){
carry = 1;
pA->a[i] = x - 10;
}else{
carry = 0;
pA->a[i] = x;
}
}
}else{
signed char *aA, *aB;
int borrow = 0;
rc = memcmp(pA->a, pB->a, nDigit);
if( rc<0 ){
aA = pB->a;
aB = pA->a;
pA->sign = !pA->sign;
}else{
aA = pA->a;
aB = pB->a;
}
for(i=nDigit-1; i>=0; i--){
int x = aA[i] - aB[i] - borrow;
if( x<0 ){
pA->a[i] = x+10;
borrow = 1;
}else{
pA->a[i] = x;
borrow = 0;
}
}
}
}
}
/*
** Compare text in decimal order.
*/
static int decimalCollFunc(
void *notUsed,
int nKey1, const void *pKey1,
int nKey2, const void *pKey2
){
const unsigned char *zA = (const unsigned char*)pKey1;
const unsigned char *zB = (const unsigned char*)pKey2;
Decimal *pA = decimal_new(0, 0, nKey1, zA);
Decimal *pB = decimal_new(0, 0, nKey2, zB);
int rc;
if( pA==0 || pB==0 ){
rc = 0;
}else{
rc = decimal_cmp(pA, pB);
}
decimal_free(pA);
decimal_free(pB);
return rc;
}
/*
** SQL Function: decimal_add(X, Y)
** decimal_sub(X, Y)
**
** Return the sum or difference of X and Y.
*/
static void decimalAddFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
Decimal *pA = decimal_new(context, argv[0], 0, 0);
Decimal *pB = decimal_new(context, argv[1], 0, 0);
decimal_add(pA, pB);
decimal_result(context, pA);
decimal_free(pA);
decimal_free(pB);
}
static void decimalSubFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
Decimal *pA = decimal_new(context, argv[0], 0, 0);
Decimal *pB = decimal_new(context, argv[1], 0, 0);
if( pB==0 ) return;
pB->sign = !pB->sign;
decimal_add(pA, pB);
decimal_result(context, pA);
decimal_free(pA);
decimal_free(pB);
}
/* Aggregate funcion: decimal_sum(X)
**
** Works like sum() except that it uses decimal arithmetic for unlimited
** precision.
*/
static void decimalSumStep(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
Decimal *p;
Decimal *pArg;
p = sqlite3_aggregate_context(context, sizeof(*p));
if( p==0 ) return;
if( !p->isInit ){
p->isInit = 1;
p->a = sqlite3_malloc(2);
if( p->a==0 ){
p->oom = 1;
}else{
p->a[0] = 0;
}
p->nDigit = 1;
p->nFrac = 0;
}
if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
pArg = decimal_new(context, argv[0], 0, 0);
decimal_add(p, pArg);
decimal_free(pArg);
}
static void decimalSumInverse(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
Decimal *p;
Decimal *pArg;
p = sqlite3_aggregate_context(context, sizeof(*p));
if( p==0 ) return;
if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
pArg = decimal_new(context, argv[0], 0, 0);
if( pArg ) pArg->sign = !pArg->sign;
decimal_add(p, pArg);
decimal_free(pArg);
}
static void decimalSumValue(sqlite3_context *context){
Decimal *p = sqlite3_aggregate_context(context, 0);
if( p==0 ) return;
decimal_result(context, p);
}
static void decimalSumFinalize(sqlite3_context *context){
Decimal *p = sqlite3_aggregate_context(context, 0);
if( p==0 ) return;
decimal_result(context, p);
decimal_clear(p);
}
/*
** SQL Function: decimal_mul(X, Y)
**
** Return the product of X and Y.
**
** All significant digits after the decimal point are retained.
** Trailing zeros after the decimal point are omitted as long as
** the number of digits after the decimal point is no less than
** either the number of digits in either input.
*/
static void decimalMulFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
Decimal *pA = decimal_new(context, argv[0], 0, 0);
Decimal *pB = decimal_new(context, argv[1], 0, 0);
signed char *acc = 0;
int i, j, k;
int minFrac;
if( pA==0 || pA->oom || pA->isNull
|| pB==0 || pB->oom || pB->isNull
){
goto mul_end;
}
acc = sqlite3_malloc64( pA->nDigit + pB->nDigit + 2 );
if( acc==0 ){
sqlite3_result_error_nomem(context);
goto mul_end;
}
memset(acc, 0, pA->nDigit + pB->nDigit + 2);
minFrac = pA->nFrac;
if( pB->nFrac<minFrac ) minFrac = pB->nFrac;
for(i=pA->nDigit-1; i>=0; i--){
signed char f = pA->a[i];
int carry = 0, x;
for(j=pB->nDigit-1, k=i+j+3; j>=0; j--, k--){
x = acc[k] + f*pB->a[j] + carry;
acc[k] = x%10;
carry = x/10;
}
x = acc[k] + carry;
acc[k] = x%10;
acc[k-1] += x/10;
}
sqlite3_free(pA->a);
pA->a = acc;
acc = 0;
pA->nDigit += pB->nDigit + 2;
pA->nFrac += pB->nFrac;
pA->sign ^= pB->sign;
while( pA->nFrac>minFrac && pA->a[pA->nDigit-1]==0 ){
pA->nFrac--;
pA->nDigit--;
}
decimal_result(context, pA);
mul_end:
sqlite3_free(acc);
decimal_free(pA);
decimal_free(pB);
}
int sqlite3_decimal_init(
sqlite3 *db,
char **pzErrMsg,
const sqlite3_api_routines *pApi
){
int rc = SQLITE_OK;
static const struct {
const char *zFuncName;
int nArg;
void (*xFunc)(sqlite3_context*,int,sqlite3_value**);
} aFunc[] = {
{ "decimal", 1, decimalFunc },
{ "decimal_cmp", 2, decimalCmpFunc },
{ "decimal_add", 2, decimalAddFunc },
{ "decimal_sub", 2, decimalSubFunc },
{ "decimal_mul", 2, decimalMulFunc },
};
unsigned int i;
(void)pzErrMsg; /* Unused parameter */
SQLITE_EXTENSION_INIT2(pApi);
for(i=0; i<sizeof(aFunc)/sizeof(aFunc[0]) && rc==SQLITE_OK; i++){
rc = sqlite3_create_function(db, aFunc[i].zFuncName, aFunc[i].nArg,
SQLITE_UTF8|SQLITE_INNOCUOUS|SQLITE_DETERMINISTIC,
0, aFunc[i].xFunc, 0, 0);
}
if( rc==SQLITE_OK ){
rc = sqlite3_create_window_function(db, "decimal_sum", 1,
SQLITE_UTF8|SQLITE_INNOCUOUS|SQLITE_DETERMINISTIC, 0,
decimalSumStep, decimalSumFinalize,
decimalSumValue, decimalSumInverse, 0);
}
if( rc==SQLITE_OK ){
rc = sqlite3_create_collation(db, "decimal", SQLITE_UTF8,
0, decimalCollFunc);
}
return rc;
}
| 14,253 | 621 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/vdbe.inc | /*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** Header file for the Virtual DataBase Engine (VDBE)
**
** This header defines the interface to the virtual database engine
** or VDBE. The VDBE implements an abstract machine that runs a
** simple program to access and modify the underlying database.
*/
#ifndef SQLITE_VDBE_H
#define SQLITE_VDBE_H
#include "libc/stdio/stdio.h"
/*
** A single VDBE is an opaque structure named "Vdbe". Only routines
** in the source file sqliteVdbe.c are allowed to see the insides
** of this structure.
*/
typedef struct Vdbe Vdbe;
/*
** The names of the following types declared in vdbeInt.h are required
** for the VdbeOp definition.
*/
typedef struct sqlite3_value Mem;
typedef struct SubProgram SubProgram;
/*
** A single instruction of the virtual machine has an opcode
** and as many as three operands. The instruction is recorded
** as an instance of the following structure:
*/
struct VdbeOp {
u8 opcode; /* What operation to perform */
signed char p4type; /* One of the P4_xxx constants for p4 */
u16 p5; /* Fifth parameter is an unsigned 16-bit integer */
int p1; /* First operand */
int p2; /* Second parameter (often the jump destination) */
int p3; /* The third parameter */
union p4union { /* fourth parameter */
int i; /* Integer value if p4type==P4_INT32 */
void *p; /* Generic pointer */
char *z; /* Pointer to data for string (char array) types */
i64 *pI64; /* Used when p4type is P4_INT64 */
double *pReal; /* Used when p4type is P4_REAL */
FuncDef *pFunc; /* Used when p4type is P4_FUNCDEF */
sqlite3_context *pCtx; /* Used when p4type is P4_FUNCCTX */
CollSeq *pColl; /* Used when p4type is P4_COLLSEQ */
Mem *pMem; /* Used when p4type is P4_MEM */
VTable *pVtab; /* Used when p4type is P4_VTAB */
KeyInfo *pKeyInfo; /* Used when p4type is P4_KEYINFO */
u32 *ai; /* Used when p4type is P4_INTARRAY */
SubProgram *pProgram; /* Used when p4type is P4_SUBPROGRAM */
Table *pTab; /* Used when p4type is P4_TABLE */
#ifdef SQLITE_ENABLE_CURSOR_HINTS
Expr *pExpr; /* Used when p4type is P4_EXPR */
#endif
} p4;
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
char *zComment; /* Comment to improve readability */
#endif
#ifdef VDBE_PROFILE
u32 cnt; /* Number of times this instruction was executed */
u64 cycles; /* Total time spent executing this instruction */
#endif
#ifdef SQLITE_VDBE_COVERAGE
u32 iSrcLine; /* Source-code line that generated this opcode
** with flags in the upper 8 bits */
#endif
};
typedef struct VdbeOp VdbeOp;
/*
** A sub-routine used to implement a trigger program.
*/
struct SubProgram {
VdbeOp *aOp; /* Array of opcodes for sub-program */
int nOp; /* Elements in aOp[] */
int nMem; /* Number of memory cells required */
int nCsr; /* Number of cursors required */
u8 *aOnce; /* Array of OP_Once flags */
void *token; /* id that may be used to recursive triggers */
SubProgram *pNext; /* Next sub-program already visited */
};
/*
** A smaller version of VdbeOp used for the VdbeAddOpList() function because
** it takes up less space.
*/
struct VdbeOpList {
u8 opcode; /* What operation to perform */
signed char p1; /* First operand */
signed char p2; /* Second parameter (often the jump destination) */
signed char p3; /* Third parameter */
};
typedef struct VdbeOpList VdbeOpList;
/*
** Allowed values of VdbeOp.p4type
*/
#define P4_NOTUSED 0 /* The P4 parameter is not used */
#define P4_TRANSIENT 0 /* P4 is a pointer to a transient string */
#define P4_STATIC (-1) /* Pointer to a static string */
#define P4_COLLSEQ (-2) /* P4 is a pointer to a CollSeq structure */
#define P4_INT32 (-3) /* P4 is a 32-bit signed integer */
#define P4_SUBPROGRAM (-4) /* P4 is a pointer to a SubProgram structure */
#define P4_TABLE (-5) /* P4 is a pointer to a Table structure */
/* Above do not own any resources. Must free those below */
#define P4_FREE_IF_LE (-6)
#define P4_DYNAMIC (-6) /* Pointer to memory from sqliteMalloc() */
#define P4_FUNCDEF (-7) /* P4 is a pointer to a FuncDef structure */
#define P4_KEYINFO (-8) /* P4 is a pointer to a KeyInfo structure */
#define P4_EXPR (-9) /* P4 is a pointer to an Expr tree */
#define P4_MEM (-10) /* P4 is a pointer to a Mem* structure */
#define P4_VTAB (-11) /* P4 is a pointer to an sqlite3_vtab structure */
#define P4_REAL (-12) /* P4 is a 64-bit floating point value */
#define P4_INT64 (-13) /* P4 is a 64-bit signed integer */
#define P4_INTARRAY (-14) /* P4 is a vector of 32-bit integers */
#define P4_FUNCCTX (-15) /* P4 is a pointer to an sqlite3_context object */
/* Error message codes for OP_Halt */
#define P5_ConstraintNotNull 1
#define P5_ConstraintUnique 2
#define P5_ConstraintCheck 3
#define P5_ConstraintFK 4
/*
** The Vdbe.aColName array contains 5n Mem structures, where n is the
** number of columns of data returned by the statement.
*/
#define COLNAME_NAME 0
#define COLNAME_DECLTYPE 1
#define COLNAME_DATABASE 2
#define COLNAME_TABLE 3
#define COLNAME_COLUMN 4
#ifdef SQLITE_ENABLE_COLUMN_METADATA
# define COLNAME_N 5 /* Number of COLNAME_xxx symbols */
#else
# ifdef SQLITE_OMIT_DECLTYPE
# define COLNAME_N 1 /* Store only the name */
# else
# define COLNAME_N 2 /* Store the name and decltype */
# endif
#endif
/*
** The following macro converts a label returned by sqlite3VdbeMakeLabel()
** into an index into the Parse.aLabel[] array that contains the resolved
** address of that label.
*/
#define ADDR(X) (~(X))
/*
** The makefile scans the vdbe.c source file and creates the "opcodes.h"
** header file that defines a number for each opcode used by the VDBE.
*/
#include "third_party/sqlite3/opcodes.h"
/*
** Additional non-public SQLITE_PREPARE_* flags
*/
#define SQLITE_PREPARE_SAVESQL 0x80 /* Preserve SQL text */
#define SQLITE_PREPARE_MASK 0x0f /* Mask of public flags */
/*
** Prototypes for the VDBE interface. See comments on the implementation
** for a description of what each of these routines does.
*/
Vdbe *sqlite3VdbeCreate(Parse*);
Parse *sqlite3VdbeParser(Vdbe*);
int sqlite3VdbeAddOp0(Vdbe*,int);
int sqlite3VdbeAddOp1(Vdbe*,int,int);
int sqlite3VdbeAddOp2(Vdbe*,int,int,int);
int sqlite3VdbeGoto(Vdbe*,int);
int sqlite3VdbeLoadString(Vdbe*,int,const char*);
void sqlite3VdbeMultiLoad(Vdbe*,int,const char*,...);
int sqlite3VdbeAddOp3(Vdbe*,int,int,int,int);
int sqlite3VdbeAddOp4(Vdbe*,int,int,int,int,const char *zP4,int);
int sqlite3VdbeAddOp4Dup8(Vdbe*,int,int,int,int,const u8*,int);
int sqlite3VdbeAddOp4Int(Vdbe*,int,int,int,int,int);
int sqlite3VdbeAddFunctionCall(Parse*,int,int,int,int,const FuncDef*,int);
void sqlite3VdbeEndCoroutine(Vdbe*,int);
#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N);
void sqlite3VdbeVerifyNoResultRow(Vdbe *p);
#else
# define sqlite3VdbeVerifyNoMallocRequired(A,B)
# define sqlite3VdbeVerifyNoResultRow(A)
#endif
#if defined(SQLITE_DEBUG)
void sqlite3VdbeVerifyAbortable(Vdbe *p, int);
void sqlite3VdbeNoJumpsOutsideSubrtn(Vdbe*,int,int,int);
#else
# define sqlite3VdbeVerifyAbortable(A,B)
# define sqlite3VdbeNoJumpsOutsideSubrtn(A,B,C,D)
#endif
VdbeOp *sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp,int iLineno);
#ifndef SQLITE_OMIT_EXPLAIN
void sqlite3VdbeExplain(Parse*,u8,const char*,...);
void sqlite3VdbeExplainPop(Parse*);
int sqlite3VdbeExplainParent(Parse*);
# define ExplainQueryPlan(P) sqlite3VdbeExplain P
# define ExplainQueryPlanPop(P) sqlite3VdbeExplainPop(P)
# define ExplainQueryPlanParent(P) sqlite3VdbeExplainParent(P)
#else
# define ExplainQueryPlan(P)
# define ExplainQueryPlanPop(P)
# define ExplainQueryPlanParent(P) 0
# define sqlite3ExplainBreakpoint(A,B) /*no-op*/
#endif
#if defined(SQLITE_DEBUG) && !defined(SQLITE_OMIT_EXPLAIN)
void sqlite3ExplainBreakpoint(const char*,const char*);
#else
# define sqlite3ExplainBreakpoint(A,B) /*no-op*/
#endif
void sqlite3VdbeAddParseSchemaOp(Vdbe*, int, char*, u16);
void sqlite3VdbeChangeOpcode(Vdbe*, int addr, u8);
void sqlite3VdbeChangeP1(Vdbe*, int addr, int P1);
void sqlite3VdbeChangeP2(Vdbe*, int addr, int P2);
void sqlite3VdbeChangeP3(Vdbe*, int addr, int P3);
void sqlite3VdbeChangeP5(Vdbe*, u16 P5);
void sqlite3VdbeTypeofColumn(Vdbe*, int);
void sqlite3VdbeJumpHere(Vdbe*, int addr);
void sqlite3VdbeJumpHereOrPopInst(Vdbe*, int addr);
int sqlite3VdbeChangeToNoop(Vdbe*, int addr);
int sqlite3VdbeDeletePriorOpcode(Vdbe*, u8 op);
#ifdef SQLITE_DEBUG
void sqlite3VdbeReleaseRegisters(Parse*,int addr, int n, u32 mask, int);
#else
# define sqlite3VdbeReleaseRegisters(P,A,N,M,F)
#endif
void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N);
void sqlite3VdbeAppendP4(Vdbe*, void *pP4, int p4type);
void sqlite3VdbeSetP4KeyInfo(Parse*, Index*);
void sqlite3VdbeUsesBtree(Vdbe*, int);
VdbeOp *sqlite3VdbeGetOp(Vdbe*, int);
VdbeOp *sqlite3VdbeGetLastOp(Vdbe*);
int sqlite3VdbeMakeLabel(Parse*);
void sqlite3VdbeRunOnlyOnce(Vdbe*);
void sqlite3VdbeReusable(Vdbe*);
void sqlite3VdbeDelete(Vdbe*);
void sqlite3VdbeMakeReady(Vdbe*,Parse*);
int sqlite3VdbeFinalize(Vdbe*);
void sqlite3VdbeResolveLabel(Vdbe*, int);
int sqlite3VdbeCurrentAddr(Vdbe*);
#ifdef SQLITE_DEBUG
int sqlite3VdbeAssertMayAbort(Vdbe *, int);
#endif
void sqlite3VdbeResetStepResult(Vdbe*);
void sqlite3VdbeRewind(Vdbe*);
int sqlite3VdbeReset(Vdbe*);
void sqlite3VdbeSetNumCols(Vdbe*,int);
int sqlite3VdbeSetColName(Vdbe*, int, int, const char *, void(*)(void*));
void sqlite3VdbeCountChanges(Vdbe*);
sqlite3 *sqlite3VdbeDb(Vdbe*);
u8 sqlite3VdbePrepareFlags(Vdbe*);
void sqlite3VdbeSetSql(Vdbe*, const char *z, int n, u8);
#ifdef SQLITE_ENABLE_NORMALIZE
void sqlite3VdbeAddDblquoteStr(sqlite3*,Vdbe*,const char*);
int sqlite3VdbeUsesDoubleQuotedString(Vdbe*,const char*);
#endif
void sqlite3VdbeSwap(Vdbe*,Vdbe*);
VdbeOp *sqlite3VdbeTakeOpArray(Vdbe*, int*, int*);
sqlite3_value *sqlite3VdbeGetBoundValue(Vdbe*, int, u8);
void sqlite3VdbeSetVarmask(Vdbe*, int);
#ifndef SQLITE_OMIT_TRACE
char *sqlite3VdbeExpandSql(Vdbe*, const char*);
#endif
int sqlite3MemCompare(const Mem*, const Mem*, const CollSeq*);
int sqlite3BlobCompare(const Mem*, const Mem*);
void sqlite3VdbeRecordUnpack(KeyInfo*,int,const void*,UnpackedRecord*);
int sqlite3VdbeRecordCompare(int,const void*,UnpackedRecord*);
int sqlite3VdbeRecordCompareWithSkip(int, const void *, UnpackedRecord *, int);
UnpackedRecord *sqlite3VdbeAllocUnpackedRecord(KeyInfo*);
typedef int (*RecordCompare)(int,const void*,UnpackedRecord*);
RecordCompare sqlite3VdbeFindCompare(UnpackedRecord*);
void sqlite3VdbeLinkSubProgram(Vdbe *, SubProgram *);
int sqlite3VdbeHasSubProgram(Vdbe*);
int sqlite3NotPureFunc(sqlite3_context*);
#ifdef SQLITE_ENABLE_BYTECODE_VTAB
int sqlite3VdbeBytecodeVtabInit(sqlite3*);
#endif
/* Use SQLITE_ENABLE_COMMENTS to enable generation of extra comments on
** each VDBE opcode.
**
** Use the SQLITE_ENABLE_MODULE_COMMENTS macro to see some extra no-op
** comments in VDBE programs that show key decision points in the code
** generator.
*/
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
void sqlite3VdbeComment(Vdbe*, const char*, ...);
# define VdbeComment(X) sqlite3VdbeComment X
void sqlite3VdbeNoopComment(Vdbe*, const char*, ...);
# define VdbeNoopComment(X) sqlite3VdbeNoopComment X
# ifdef SQLITE_ENABLE_MODULE_COMMENTS
# define VdbeModuleComment(X) sqlite3VdbeNoopComment X
# else
# define VdbeModuleComment(X)
# endif
#else
# define VdbeComment(X)
# define VdbeNoopComment(X)
# define VdbeModuleComment(X)
#endif
/*
** The VdbeCoverage macros are used to set a coverage testing point
** for VDBE branch instructions. The coverage testing points are line
** numbers in the sqlite3.c source file. VDBE branch coverage testing
** only works with an amalagmation build. That's ok since a VDBE branch
** coverage build designed for testing the test suite only. No application
** should ever ship with VDBE branch coverage measuring turned on.
**
** VdbeCoverage(v) // Mark the previously coded instruction
** // as a branch
**
** VdbeCoverageIf(v, conditional) // Mark previous if conditional true
**
** VdbeCoverageAlwaysTaken(v) // Previous branch is always taken
**
** VdbeCoverageNeverTaken(v) // Previous branch is never taken
**
** VdbeCoverageNeverNull(v) // Previous three-way branch is only
** // taken on the first two ways. The
** // NULL option is not possible
**
** VdbeCoverageEqNe(v) // Previous OP_Jump is only interested
** // in distingishing equal and not-equal.
**
** Every VDBE branch operation must be tagged with one of the macros above.
** If not, then when "make test" is run with -DSQLITE_VDBE_COVERAGE and
** -DSQLITE_DEBUG then an ALWAYS() will fail in the vdbeTakeBranch()
** routine in vdbe.c, alerting the developer to the missed tag.
**
** During testing, the test application will invoke
** sqlite3_test_control(SQLITE_TESTCTRL_VDBE_COVERAGE,...) to set a callback
** routine that is invoked as each bytecode branch is taken. The callback
** contains the sqlite3.c source line number ov the VdbeCoverage macro and
** flags to indicate whether or not the branch was taken. The test application
** is responsible for keeping track of this and reporting byte-code branches
** that are never taken.
**
** See the VdbeBranchTaken() macro and vdbeTakeBranch() function in the
** vdbe.c source file for additional information.
*/
#ifdef SQLITE_VDBE_COVERAGE
void sqlite3VdbeSetLineNumber(Vdbe*,int);
# define VdbeCoverage(v) sqlite3VdbeSetLineNumber(v,__LINE__)
# define VdbeCoverageIf(v,x) if(x)sqlite3VdbeSetLineNumber(v,__LINE__)
# define VdbeCoverageAlwaysTaken(v) \
sqlite3VdbeSetLineNumber(v,__LINE__|0x5000000);
# define VdbeCoverageNeverTaken(v) \
sqlite3VdbeSetLineNumber(v,__LINE__|0x6000000);
# define VdbeCoverageNeverNull(v) \
sqlite3VdbeSetLineNumber(v,__LINE__|0x4000000);
# define VdbeCoverageNeverNullIf(v,x) \
if(x)sqlite3VdbeSetLineNumber(v,__LINE__|0x4000000);
# define VdbeCoverageEqNe(v) \
sqlite3VdbeSetLineNumber(v,__LINE__|0x8000000);
# define VDBE_OFFSET_LINENO(x) (__LINE__+x)
#else
# define VdbeCoverage(v)
# define VdbeCoverageIf(v,x)
# define VdbeCoverageAlwaysTaken(v)
# define VdbeCoverageNeverTaken(v)
# define VdbeCoverageNeverNull(v)
# define VdbeCoverageNeverNullIf(v,x)
# define VdbeCoverageEqNe(v)
# define VDBE_OFFSET_LINENO(x) 0
#endif
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
void sqlite3VdbeScanStatus(Vdbe*, int, int, int, LogEst, const char*);
#else
# define sqlite3VdbeScanStatus(a,b,c,d,e)
#endif
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
void sqlite3VdbePrintOp(FILE*, int, VdbeOp*);
#endif
#endif /* SQLITE_VDBE_H */
| 15,750 | 397 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/mem1.c | /*
** 2007 August 14
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains low-level memory allocation drivers for when
** SQLite will use the standard C-library malloc/realloc/free interface
** to obtain the memory it needs.
**
** This file contains implementations of the low-level memory allocation
** routines specified in the sqlite3_mem_methods object. The content of
** this file is only used if SQLITE_SYSTEM_MALLOC is defined. The
** SQLITE_SYSTEM_MALLOC macro is defined automatically if neither the
** SQLITE_MEMDEBUG nor the SQLITE_WIN32_MALLOC macros are defined. The
** default configuration is to use memory allocation routines in this
** file.
**
** C-preprocessor macro summary:
**
** HAVE_MALLOC_USABLE_SIZE The configure script sets this symbol if
** the malloc_usable_size() interface exists
** on the target platform. Or, this symbol
** can be set manually, if desired.
** If an equivalent interface exists by
** a different name, using a separate -D
** option to rename it.
**
** SQLITE_WITHOUT_ZONEMALLOC Some older macs lack support for the zone
** memory allocator. Set this symbol to enable
** building on older macs.
**
** SQLITE_WITHOUT_MSIZE Set this symbol to disable the use of
** _msize() on windows systems. This might
** be necessary when compiling for Delphi,
** for example.
*/
#include "third_party/sqlite3/sqliteInt.h"
/*
** This version of the memory allocator is the default. It is
** used when no other memory allocator is specified using compile-time
** macros.
*/
#ifdef SQLITE_SYSTEM_MALLOC
#if defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC)
/*
** Use the zone allocator available on apple products unless the
** SQLITE_WITHOUT_ZONEMALLOC symbol is defined.
*/
#include <sys/sysctl.h>
#include <malloc/malloc.h>
#ifdef SQLITE_MIGHT_BE_SINGLE_CORE
#include <libkern/OSAtomic.h>
#endif /* SQLITE_MIGHT_BE_SINGLE_CORE */
static malloc_zone_t* _sqliteZone_;
#define SQLITE_MALLOC(x) malloc_zone_malloc(_sqliteZone_, (x))
#define SQLITE_FREE(x) malloc_zone_free(_sqliteZone_, (x));
#define SQLITE_REALLOC(x,y) malloc_zone_realloc(_sqliteZone_, (x), (y))
#define SQLITE_MALLOCSIZE(x) \
(_sqliteZone_ ? _sqliteZone_->size(_sqliteZone_,x) : malloc_size(x))
#else /* if not __APPLE__ */
/*
** Use standard C library malloc and free on non-Apple systems.
** Also used by Apple systems if SQLITE_WITHOUT_ZONEMALLOC is defined.
*/
#define SQLITE_MALLOC(x) malloc(x)
#define SQLITE_FREE(x) free(x)
#define SQLITE_REALLOC(x,y) realloc((x),(y))
/*
** The malloc.h header file is needed for malloc_usable_size() function
** on some systems (e.g. Linux).
*/
#if HAVE_MALLOC_H && HAVE_MALLOC_USABLE_SIZE
# define SQLITE_USE_MALLOC_H 1
# define SQLITE_USE_MALLOC_USABLE_SIZE 1
/*
** The MSVCRT has malloc_usable_size(), but it is called _msize(). The
** use of _msize() is automatic, but can be disabled by compiling with
** -DSQLITE_WITHOUT_MSIZE. Using the _msize() function also requires
** the malloc.h header file.
*/
#elif defined(_MSC_VER) && !defined(SQLITE_WITHOUT_MSIZE)
# define SQLITE_USE_MALLOC_H
# define SQLITE_USE_MSIZE
#endif
/*
** Include the malloc.h header file, if necessary. Also set define macro
** SQLITE_MALLOCSIZE to the appropriate function name, which is _msize()
** for MSVC and malloc_usable_size() for most other systems (e.g. Linux).
** The memory size function can always be overridden manually by defining
** the macro SQLITE_MALLOCSIZE to the desired function name.
*/
#if defined(SQLITE_USE_MALLOC_H)
# include <malloc.h>
# if defined(SQLITE_USE_MALLOC_USABLE_SIZE)
# if !defined(SQLITE_MALLOCSIZE)
# define SQLITE_MALLOCSIZE(x) malloc_usable_size(x)
# endif
# elif defined(SQLITE_USE_MSIZE)
# if !defined(SQLITE_MALLOCSIZE)
# define SQLITE_MALLOCSIZE _msize
# endif
# endif
#endif /* defined(SQLITE_USE_MALLOC_H) */
#endif /* __APPLE__ or not __APPLE__ */
/*
** Like malloc(), but remember the size of the allocation
** so that we can find it later using sqlite3MemSize().
**
** For this low-level routine, we are guaranteed that nByte>0 because
** cases of nByte<=0 will be intercepted and dealt with by higher level
** routines.
*/
static void *sqlite3MemMalloc(int nByte){
#ifdef SQLITE_MALLOCSIZE
void *p;
testcase( ROUND8(nByte)==nByte );
p = SQLITE_MALLOC( nByte );
if( p==0 ){
testcase( sqlite3GlobalConfig.xLog!=0 );
sqlite3_log(SQLITE_NOMEM, "failed to allocate %u bytes of memory", nByte);
}
return p;
#else
sqlite3_int64 *p;
assert( nByte>0 );
testcase( ROUND8(nByte)!=nByte );
p = SQLITE_MALLOC( nByte+8 );
if( p ){
p[0] = nByte;
p++;
}else{
testcase( sqlite3GlobalConfig.xLog!=0 );
sqlite3_log(SQLITE_NOMEM, "failed to allocate %u bytes of memory", nByte);
}
return (void *)p;
#endif
}
/*
** Like free() but works for allocations obtained from sqlite3MemMalloc()
** or sqlite3MemRealloc().
**
** For this low-level routine, we already know that pPrior!=0 since
** cases where pPrior==0 will have been intecepted and dealt with
** by higher-level routines.
*/
static void sqlite3MemFree(void *pPrior){
#ifdef SQLITE_MALLOCSIZE
SQLITE_FREE(pPrior);
#else
sqlite3_int64 *p = (sqlite3_int64*)pPrior;
assert( pPrior!=0 );
p--;
SQLITE_FREE(p);
#endif
}
/*
** Report the allocated size of a prior return from xMalloc()
** or xRealloc().
*/
static int sqlite3MemSize(void *pPrior){
#ifdef SQLITE_MALLOCSIZE
assert( pPrior!=0 );
return (int)SQLITE_MALLOCSIZE(pPrior);
#else
sqlite3_int64 *p;
assert( pPrior!=0 );
p = (sqlite3_int64*)pPrior;
p--;
return (int)p[0];
#endif
}
/*
** Like realloc(). Resize an allocation previously obtained from
** sqlite3MemMalloc().
**
** For this low-level interface, we know that pPrior!=0. Cases where
** pPrior==0 while have been intercepted by higher-level routine and
** redirected to xMalloc. Similarly, we know that nByte>0 because
** cases where nByte<=0 will have been intercepted by higher-level
** routines and redirected to xFree.
*/
static void *sqlite3MemRealloc(void *pPrior, int nByte){
#ifdef SQLITE_MALLOCSIZE
void *p = SQLITE_REALLOC(pPrior, nByte);
if( p==0 ){
testcase( sqlite3GlobalConfig.xLog!=0 );
sqlite3_log(SQLITE_NOMEM,
"failed memory resize %u to %u bytes",
SQLITE_MALLOCSIZE(pPrior), nByte);
}
return p;
#else
sqlite3_int64 *p = (sqlite3_int64*)pPrior;
assert( pPrior!=0 && nByte>0 );
assert( nByte==ROUND8(nByte) ); /* EV: R-46199-30249 */
p--;
p = SQLITE_REALLOC(p, nByte+8 );
if( p ){
p[0] = nByte;
p++;
}else{
testcase( sqlite3GlobalConfig.xLog!=0 );
sqlite3_log(SQLITE_NOMEM,
"failed memory resize %u to %u bytes",
sqlite3MemSize(pPrior), nByte);
}
return (void*)p;
#endif
}
/*
** Round up a request size to the next valid allocation size.
*/
static int sqlite3MemRoundup(int n){
return ROUND8(n);
}
/*
** Initialize this module.
*/
static int sqlite3MemInit(void *NotUsed){
#if defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC)
int cpuCount;
size_t len;
if( _sqliteZone_ ){
return SQLITE_OK;
}
len = sizeof(cpuCount);
/* One usually wants to use hw.acctivecpu for MT decisions, but not here */
sysctlbyname("hw.ncpu", &cpuCount, &len, NULL, 0);
if( cpuCount>1 ){
/* defer MT decisions to system malloc */
_sqliteZone_ = malloc_default_zone();
}else{
/* only 1 core, use our own zone to contention over global locks,
** e.g. we have our own dedicated locks */
_sqliteZone_ = malloc_create_zone(4096, 0);
malloc_set_zone_name(_sqliteZone_, "Sqlite_Heap");
}
#endif /* defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC) */
UNUSED_PARAMETER(NotUsed);
return SQLITE_OK;
}
/*
** Deinitialize this module.
*/
static void sqlite3MemShutdown(void *NotUsed){
UNUSED_PARAMETER(NotUsed);
return;
}
/*
** This routine is the only routine in this file with external linkage.
**
** Populate the low-level memory allocation function pointers in
** sqlite3GlobalConfig.m with pointers to the routines in this file.
*/
void sqlite3MemSetDefault(void){
static const sqlite3_mem_methods defaultMethods = {
sqlite3MemMalloc,
sqlite3MemFree,
sqlite3MemRealloc,
sqlite3MemSize,
sqlite3MemRoundup,
sqlite3MemInit,
sqlite3MemShutdown,
0
};
sqlite3_config(SQLITE_CONFIG_MALLOC, &defaultMethods);
}
#endif /* SQLITE_SYSTEM_MALLOC */
| 9,118 | 292 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/userauth.shell.c | #include "third_party/sqlite3/userauth.c"
| 42 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fileio.c | /*
** 2014-06-13
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This SQLite extension implements SQL functions readfile() and
** writefile(), and eponymous virtual type "fsdir".
**
** WRITEFILE(FILE, DATA [, MODE [, MTIME]]):
**
** If neither of the optional arguments is present, then this UDF
** function writes blob DATA to file FILE. If successful, the number
** of bytes written is returned. If an error occurs, NULL is returned.
**
** If the first option argument - MODE - is present, then it must
** be passed an integer value that corresponds to a POSIX mode
** value (file type + permissions, as returned in the stat.st_mode
** field by the stat() system call). Three types of files may
** be written/created:
**
** regular files: (mode & 0170000)==0100000
** symbolic links: (mode & 0170000)==0120000
** directories: (mode & 0170000)==0040000
**
** For a directory, the DATA is ignored. For a symbolic link, it is
** interpreted as text and used as the target of the link. For a
** regular file, it is interpreted as a blob and written into the
** named file. Regardless of the type of file, its permissions are
** set to (mode & 0777) before returning.
**
** If the optional MTIME argument is present, then it is interpreted
** as an integer - the number of seconds since the unix epoch. The
** modification-time of the target file is set to this value before
** returning.
**
** If three or more arguments are passed to this function and an
** error is encountered, an exception is raised.
**
** READFILE(FILE):
**
** Read and return the contents of file FILE (type blob) from disk.
**
** FSDIR:
**
** Used as follows:
**
** SELECT * FROM fsdir($path [, $dir]);
**
** Parameter $path is an absolute or relative pathname. If the file that it
** refers to does not exist, it is an error. If the path refers to a regular
** file or symbolic link, it returns a single row. Or, if the path refers
** to a directory, it returns one row for the directory, and one row for each
** file within the hierarchy rooted at $path.
**
** Each row has the following columns:
**
** name: Path to file or directory (text value).
** mode: Value of stat.st_mode for directory entry (an integer).
** mtime: Value of stat.st_mtime for directory entry (an integer).
** data: For a regular file, a blob containing the file data. For a
** symlink, a text value containing the text of the link. For a
** directory, NULL.
**
** If a non-NULL value is specified for the optional $dir parameter and
** $path is a relative path, then $path is interpreted relative to $dir.
** And the paths returned in the "name" column of the table are also
** relative to directory $dir.
*/
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/dirent.h"
#include "libc/calls/struct/stat.h"
#include "libc/calls/struct/stat.macros.h"
#include "libc/calls/weirdtypes.h"
#include "libc/errno.h"
#include "libc/isystem/unistd.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/s.h"
#include "libc/time/time.h"
#include "third_party/sqlite3/sqlite3ext.h"
// clang-format off
SQLITE_EXTENSION_INIT1
/*
** Structure of the fsdir() table-valued function
*/
/* 0 1 2 3 4 5 */
#define FSDIR_SCHEMA "(name,mode,mtime,data,path HIDDEN,dir HIDDEN)"
#define FSDIR_COLUMN_NAME 0 /* Name of the file */
#define FSDIR_COLUMN_MODE 1 /* Access mode */
#define FSDIR_COLUMN_MTIME 2 /* Last modification time */
#define FSDIR_COLUMN_DATA 3 /* File content */
#define FSDIR_COLUMN_PATH 4 /* Path to top of search */
#define FSDIR_COLUMN_DIR 5 /* Path is relative to this directory */
/*
** Set the result stored by context ctx to a blob containing the
** contents of file zName. Or, leave the result unchanged (NULL)
** if the file does not exist or is unreadable.
**
** If the file exceeds the SQLite blob size limit, through an
** SQLITE_TOOBIG error.
**
** Throw an SQLITE_IOERR if there are difficulties pulling the file
** off of disk.
*/
static void readFileContents(sqlite3_context *ctx, const char *zName){
FILE *in;
sqlite3_int64 nIn;
void *pBuf;
sqlite3 *db;
int mxBlob;
in = fopen(zName, "rb");
if( in==0 ){
/* File does not exist or is unreadable. Leave the result set to NULL. */
return;
}
fseek(in, 0, SEEK_END);
nIn = ftell(in);
rewind(in);
db = sqlite3_context_db_handle(ctx);
mxBlob = sqlite3_limit(db, SQLITE_LIMIT_LENGTH, -1);
if( nIn>mxBlob ){
sqlite3_result_error_code(ctx, SQLITE_TOOBIG);
fclose(in);
return;
}
pBuf = sqlite3_malloc64( nIn ? nIn : 1 );
if( pBuf==0 ){
sqlite3_result_error_nomem(ctx);
fclose(in);
return;
}
if( nIn==(sqlite3_int64)fread(pBuf, 1, (size_t)nIn, in) ){
sqlite3_result_blob64(ctx, pBuf, nIn, sqlite3_free);
}else{
sqlite3_result_error_code(ctx, SQLITE_IOERR);
sqlite3_free(pBuf);
}
fclose(in);
}
/*
** Implementation of the "readfile(X)" SQL function. The entire content
** of the file named X is read and returned as a BLOB. NULL is returned
** if the file does not exist or is unreadable.
*/
static void readfileFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
const char *zName;
(void)(argc); /* Unused parameter */
zName = (const char*)sqlite3_value_text(argv[0]);
if( zName==0 ) return;
readFileContents(context, zName);
}
/*
** Set the error message contained in context ctx to the results of
** vprintf(zFmt, ...).
*/
static void ctxErrorMsg(sqlite3_context *ctx, const char *zFmt, ...){
char *zMsg = 0;
va_list ap;
va_start(ap, zFmt);
zMsg = sqlite3_vmprintf(zFmt, ap);
sqlite3_result_error(ctx, zMsg, -1);
sqlite3_free(zMsg);
va_end(ap);
}
/*
** This function is used in place of stat(). On Windows, special handling
** is required in order for the included time to be returned as UTC. On all
** other systems, this function simply calls stat().
*/
static int fileStat(
const char *zPath,
struct stat *pStatBuf
){
return stat(zPath, pStatBuf);
}
/*
** This function is used in place of lstat(). On Windows, special handling
** is required in order for the included time to be returned as UTC. On all
** other systems, this function simply calls lstat().
*/
static int fileLinkStat(
const char *zPath,
struct stat *pStatBuf
){
#if defined(_WIN32)
int rc = lstat(zPath, pStatBuf);
if( rc==0 ) statTimesToUtc(zPath, pStatBuf);
return rc;
#else
return lstat(zPath, pStatBuf);
#endif
}
/*
** Argument zFile is the name of a file that will be created and/or written
** by SQL function writefile(). This function ensures that the directory
** zFile will be written to exists, creating it if required. The permissions
** for any path components created by this function are set in accordance
** with the current umask.
**
** If an OOM condition is encountered, SQLITE_NOMEM is returned. Otherwise,
** SQLITE_OK is returned if the directory is successfully created, or
** SQLITE_ERROR otherwise.
*/
static int makeDirectory(
const char *zFile
){
char *zCopy = sqlite3_mprintf("%s", zFile);
int rc = SQLITE_OK;
if( zCopy==0 ){
rc = SQLITE_NOMEM;
}else{
int nCopy = (int)strlen(zCopy);
int i = 1;
while( rc==SQLITE_OK ){
struct stat sStat;
int rc2;
for(; zCopy[i]!='/' && i<nCopy; i++);
if( i==nCopy ) break;
zCopy[i] = '\0';
rc2 = fileStat(zCopy, &sStat);
if( rc2!=0 ){
if( mkdir(zCopy, 0777) ) rc = SQLITE_ERROR;
}else{
if( !S_ISDIR(sStat.st_mode) ) rc = SQLITE_ERROR;
}
zCopy[i] = '/';
i++;
}
sqlite3_free(zCopy);
}
return rc;
}
/*
** This function does the work for the writefile() UDF. Refer to
** header comments at the top of this file for details.
*/
static int writeFile(
sqlite3_context *pCtx, /* Context to return bytes written in */
const char *zFile, /* File to write */
sqlite3_value *pData, /* Data to write */
mode_t mode, /* MODE parameter passed to writefile() */
sqlite3_int64 mtime /* MTIME parameter (or -1 to not set time) */
){
if( S_ISLNK(mode) ){
const char *zTo = (const char*)sqlite3_value_text(pData);
if( symlink(zTo, zFile)<0 ) return 1;
}else
{
if( S_ISDIR(mode) ){
if( mkdir(zFile, mode) ){
/* The mkdir() call to create the directory failed. This might not
** be an error though - if there is already a directory at the same
** path and either the permissions already match or can be changed
** to do so using chmod(), it is not an error. */
struct stat sStat;
if( errno!=EEXIST
|| 0!=fileStat(zFile, &sStat)
|| !S_ISDIR(sStat.st_mode)
|| ((sStat.st_mode&0777)!=(mode&0777) && 0!=chmod(zFile, mode&0777))
){
return 1;
}
}
}else{
sqlite3_int64 nWrite = 0;
const char *z;
int rc = 0;
FILE *out = fopen(zFile, "wb");
if( out==0 ) return 1;
z = (const char*)sqlite3_value_blob(pData);
if( z ){
sqlite3_int64 n = fwrite(z, 1, sqlite3_value_bytes(pData), out);
nWrite = sqlite3_value_bytes(pData);
if( nWrite!=n ){
rc = 1;
}
}
fclose(out);
if( rc==0 && mode && chmod(zFile, mode & 0777) ){
rc = 1;
}
if( rc ) return 2;
sqlite3_result_int64(pCtx, nWrite);
}
}
if( mtime>=0 ){
/* Recent unix */
struct timespec times[2];
times[0].tv_nsec = times[1].tv_nsec = 0;
times[0].tv_sec = time(0);
times[1].tv_sec = mtime;
if( utimensat(AT_FDCWD, zFile, times, AT_SYMLINK_NOFOLLOW) ){
return 1;
}
}
return 0;
}
/*
** Implementation of the "writefile(W,X[,Y[,Z]]])" SQL function.
** Refer to header comments at the top of this file for details.
*/
static void writefileFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
const char *zFile;
mode_t mode = 0;
int res;
sqlite3_int64 mtime = -1;
if( argc<2 || argc>4 ){
sqlite3_result_error(context,
"wrong number of arguments to function writefile()", -1
);
return;
}
zFile = (const char*)sqlite3_value_text(argv[0]);
if( zFile==0 ) return;
if( argc>=3 ){
mode = (mode_t)sqlite3_value_int(argv[2]);
}
if( argc==4 ){
mtime = sqlite3_value_int64(argv[3]);
}
res = writeFile(context, zFile, argv[1], mode, mtime);
if( res==1 && errno==ENOENT ){
if( makeDirectory(zFile)==SQLITE_OK ){
res = writeFile(context, zFile, argv[1], mode, mtime);
}
}
if( argc>2 && res!=0 ){
if( S_ISLNK(mode) ){
ctxErrorMsg(context, "failed to create symlink: %s", zFile);
}else if( S_ISDIR(mode) ){
ctxErrorMsg(context, "failed to create directory: %s", zFile);
}else{
ctxErrorMsg(context, "failed to write file: %s", zFile);
}
}
}
/*
** SQL function: lsmode(MODE)
**
** Given a numberic st_mode from stat(), convert it into a human-readable
** text string in the style of "ls -l".
*/
static void lsModeFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
int i;
int iMode = sqlite3_value_int(argv[0]);
char z[16];
(void)argc;
if( S_ISLNK(iMode) ){
z[0] = 'l';
}else if( S_ISREG(iMode) ){
z[0] = '-';
}else if( S_ISDIR(iMode) ){
z[0] = 'd';
}else{
z[0] = '?';
}
for(i=0; i<3; i++){
int m = (iMode >> ((2-i)*3));
char *a = &z[1 + i*3];
a[0] = (m & 0x4) ? 'r' : '-';
a[1] = (m & 0x2) ? 'w' : '-';
a[2] = (m & 0x1) ? 'x' : '-';
}
z[10] = '\0';
sqlite3_result_text(context, z, -1, SQLITE_TRANSIENT);
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Cursor type for recursively iterating through a directory structure.
*/
typedef struct fsdir_cursor fsdir_cursor;
typedef struct FsdirLevel FsdirLevel;
struct FsdirLevel {
DIR *pDir; /* From opendir() */
char *zDir; /* Name of directory (nul-terminated) */
};
struct fsdir_cursor {
sqlite3_vtab_cursor base; /* Base class - must be first */
int nLvl; /* Number of entries in aLvl[] array */
int iLvl; /* Index of current entry */
FsdirLevel *aLvl; /* Hierarchy of directories being traversed */
const char *zBase;
int nBase;
struct stat sStat; /* Current lstat() results */
char *zPath; /* Path to current entry */
sqlite3_int64 iRowid; /* Current rowid */
};
typedef struct fsdir_tab fsdir_tab;
struct fsdir_tab {
sqlite3_vtab base; /* Base class - must be first */
};
/*
** Construct a new fsdir virtual table object.
*/
static int fsdirConnect(
sqlite3 *db,
void *pAux,
int argc, const char *const*argv,
sqlite3_vtab **ppVtab,
char **pzErr
){
fsdir_tab *pNew = 0;
int rc;
(void)pAux;
(void)argc;
(void)argv;
(void)pzErr;
rc = sqlite3_declare_vtab(db, "CREATE TABLE x" FSDIR_SCHEMA);
if( rc==SQLITE_OK ){
pNew = (fsdir_tab*)sqlite3_malloc( sizeof(*pNew) );
if( pNew==0 ) return SQLITE_NOMEM;
memset(pNew, 0, sizeof(*pNew));
sqlite3_vtab_config(db, SQLITE_VTAB_DIRECTONLY);
}
*ppVtab = (sqlite3_vtab*)pNew;
return rc;
}
/*
** This method is the destructor for fsdir vtab objects.
*/
static int fsdirDisconnect(sqlite3_vtab *pVtab){
sqlite3_free(pVtab);
return SQLITE_OK;
}
/*
** Constructor for a new fsdir_cursor object.
*/
static int fsdirOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
fsdir_cursor *pCur;
(void)p;
pCur = sqlite3_malloc( sizeof(*pCur) );
if( pCur==0 ) return SQLITE_NOMEM;
memset(pCur, 0, sizeof(*pCur));
pCur->iLvl = -1;
*ppCursor = &pCur->base;
return SQLITE_OK;
}
/*
** Reset a cursor back to the state it was in when first returned
** by fsdirOpen().
*/
static void fsdirResetCursor(fsdir_cursor *pCur){
int i;
for(i=0; i<=pCur->iLvl; i++){
FsdirLevel *pLvl = &pCur->aLvl[i];
if( pLvl->pDir ) closedir(pLvl->pDir);
sqlite3_free(pLvl->zDir);
}
sqlite3_free(pCur->zPath);
sqlite3_free(pCur->aLvl);
pCur->aLvl = 0;
pCur->zPath = 0;
pCur->zBase = 0;
pCur->nBase = 0;
pCur->nLvl = 0;
pCur->iLvl = -1;
pCur->iRowid = 1;
}
/*
** Destructor for an fsdir_cursor.
*/
static int fsdirClose(sqlite3_vtab_cursor *cur){
fsdir_cursor *pCur = (fsdir_cursor*)cur;
fsdirResetCursor(pCur);
sqlite3_free(pCur);
return SQLITE_OK;
}
/*
** Set the error message for the virtual table associated with cursor
** pCur to the results of vprintf(zFmt, ...).
*/
static void fsdirSetErrmsg(fsdir_cursor *pCur, const char *zFmt, ...){
va_list ap;
va_start(ap, zFmt);
pCur->base.pVtab->zErrMsg = sqlite3_vmprintf(zFmt, ap);
va_end(ap);
}
/*
** Advance an fsdir_cursor to its next row of output.
*/
static int fsdirNext(sqlite3_vtab_cursor *cur){
fsdir_cursor *pCur = (fsdir_cursor*)cur;
mode_t m = pCur->sStat.st_mode;
pCur->iRowid++;
if( S_ISDIR(m) ){
/* Descend into this directory */
int iNew = pCur->iLvl + 1;
FsdirLevel *pLvl;
if( iNew>=pCur->nLvl ){
int nNew = iNew+1;
sqlite3_int64 nByte = nNew*sizeof(FsdirLevel);
FsdirLevel *aNew = (FsdirLevel*)sqlite3_realloc64(pCur->aLvl, nByte);
if( aNew==0 ) return SQLITE_NOMEM;
memset(&aNew[pCur->nLvl], 0, sizeof(FsdirLevel)*(nNew-pCur->nLvl));
pCur->aLvl = aNew;
pCur->nLvl = nNew;
}
pCur->iLvl = iNew;
pLvl = &pCur->aLvl[iNew];
pLvl->zDir = pCur->zPath;
pCur->zPath = 0;
pLvl->pDir = opendir(pLvl->zDir);
if( pLvl->pDir==0 ){
fsdirSetErrmsg(pCur, "cannot read directory: %s", pCur->zPath);
return SQLITE_ERROR;
}
}
while( pCur->iLvl>=0 ){
FsdirLevel *pLvl = &pCur->aLvl[pCur->iLvl];
struct dirent *pEntry = readdir(pLvl->pDir);
if( pEntry ){
if( pEntry->d_name[0]=='.' ){
if( pEntry->d_name[1]=='.' && pEntry->d_name[2]=='\0' ) continue;
if( pEntry->d_name[1]=='\0' ) continue;
}
sqlite3_free(pCur->zPath);
pCur->zPath = sqlite3_mprintf("%s/%s", pLvl->zDir, pEntry->d_name);
if( pCur->zPath==0 ) return SQLITE_NOMEM;
if( fileLinkStat(pCur->zPath, &pCur->sStat) ){
fsdirSetErrmsg(pCur, "cannot stat file: %s", pCur->zPath);
return SQLITE_ERROR;
}
return SQLITE_OK;
}
closedir(pLvl->pDir);
sqlite3_free(pLvl->zDir);
pLvl->pDir = 0;
pLvl->zDir = 0;
pCur->iLvl--;
}
/* EOF */
sqlite3_free(pCur->zPath);
pCur->zPath = 0;
return SQLITE_OK;
}
/*
** Return values of columns for the row at which the series_cursor
** is currently pointing.
*/
static int fsdirColumn(
sqlite3_vtab_cursor *cur, /* The cursor */
sqlite3_context *ctx, /* First argument to sqlite3_result_...() */
int i /* Which column to return */
){
fsdir_cursor *pCur = (fsdir_cursor*)cur;
switch( i ){
case FSDIR_COLUMN_NAME: {
sqlite3_result_text(ctx, &pCur->zPath[pCur->nBase], -1, SQLITE_TRANSIENT);
break;
}
case FSDIR_COLUMN_MODE:
sqlite3_result_int64(ctx, pCur->sStat.st_mode);
break;
case FSDIR_COLUMN_MTIME:
sqlite3_result_int64(ctx, pCur->sStat.st_mtime);
break;
case FSDIR_COLUMN_DATA: {
mode_t m = pCur->sStat.st_mode;
if( S_ISDIR(m) ){
sqlite3_result_null(ctx);
}else if( S_ISLNK(m) ){
char aStatic[64];
char *aBuf = aStatic;
sqlite3_int64 nBuf = 64;
int n;
while( 1 ){
n = readlink(pCur->zPath, aBuf, nBuf);
if( n<nBuf ) break;
if( aBuf!=aStatic ) sqlite3_free(aBuf);
nBuf = nBuf*2;
aBuf = sqlite3_malloc64(nBuf);
if( aBuf==0 ){
sqlite3_result_error_nomem(ctx);
return SQLITE_NOMEM;
}
}
sqlite3_result_text(ctx, aBuf, n, SQLITE_TRANSIENT);
if( aBuf!=aStatic ) sqlite3_free(aBuf);
}else{
readFileContents(ctx, pCur->zPath);
}
}
case FSDIR_COLUMN_PATH:
default: {
/* The FSDIR_COLUMN_PATH and FSDIR_COLUMN_DIR are input parameters.
** always return their values as NULL */
break;
}
}
return SQLITE_OK;
}
/*
** Return the rowid for the current row. In this implementation, the
** first row returned is assigned rowid value 1, and each subsequent
** row a value 1 more than that of the previous.
*/
static int fsdirRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
fsdir_cursor *pCur = (fsdir_cursor*)cur;
*pRowid = pCur->iRowid;
return SQLITE_OK;
}
/*
** Return TRUE if the cursor has been moved off of the last
** row of output.
*/
static int fsdirEof(sqlite3_vtab_cursor *cur){
fsdir_cursor *pCur = (fsdir_cursor*)cur;
return (pCur->zPath==0);
}
/*
** xFilter callback.
**
** idxNum==1 PATH parameter only
** idxNum==2 Both PATH and DIR supplied
*/
static int fsdirFilter(
sqlite3_vtab_cursor *cur,
int idxNum, const char *idxStr,
int argc, sqlite3_value **argv
){
const char *zDir = 0;
fsdir_cursor *pCur = (fsdir_cursor*)cur;
(void)idxStr;
fsdirResetCursor(pCur);
if( idxNum==0 ){
fsdirSetErrmsg(pCur, "table function fsdir requires an argument");
return SQLITE_ERROR;
}
assert( argc==idxNum && (argc==1 || argc==2) );
zDir = (const char*)sqlite3_value_text(argv[0]);
if( zDir==0 ){
fsdirSetErrmsg(pCur, "table function fsdir requires a non-NULL argument");
return SQLITE_ERROR;
}
if( argc==2 ){
pCur->zBase = (const char*)sqlite3_value_text(argv[1]);
}
if( pCur->zBase ){
pCur->nBase = (int)strlen(pCur->zBase)+1;
pCur->zPath = sqlite3_mprintf("%s/%s", pCur->zBase, zDir);
}else{
pCur->zPath = sqlite3_mprintf("%s", zDir);
}
if( pCur->zPath==0 ){
return SQLITE_NOMEM;
}
if( fileLinkStat(pCur->zPath, &pCur->sStat) ){
fsdirSetErrmsg(pCur, "cannot stat file: %s", pCur->zPath);
return SQLITE_ERROR;
}
return SQLITE_OK;
}
/*
** SQLite will invoke this method one or more times while planning a query
** that uses the generate_series virtual table. This routine needs to create
** a query plan for each invocation and compute an estimated cost for that
** plan.
**
** In this implementation idxNum is used to represent the
** query plan. idxStr is unused.
**
** The query plan is represented by values of idxNum:
**
** (1) The path value is supplied by argv[0]
** (2) Path is in argv[0] and dir is in argv[1]
*/
static int fsdirBestIndex(
sqlite3_vtab *tab,
sqlite3_index_info *pIdxInfo
){
int i; /* Loop over constraints */
int idxPath = -1; /* Index in pIdxInfo->aConstraint of PATH= */
int idxDir = -1; /* Index in pIdxInfo->aConstraint of DIR= */
int seenPath = 0; /* True if an unusable PATH= constraint is seen */
int seenDir = 0; /* True if an unusable DIR= constraint is seen */
const struct sqlite3_index_constraint *pConstraint;
(void)tab;
pConstraint = pIdxInfo->aConstraint;
for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
if( pConstraint->op!=SQLITE_INDEX_CONSTRAINT_EQ ) continue;
switch( pConstraint->iColumn ){
case FSDIR_COLUMN_PATH: {
if( pConstraint->usable ){
idxPath = i;
seenPath = 0;
}else if( idxPath<0 ){
seenPath = 1;
}
break;
}
case FSDIR_COLUMN_DIR: {
if( pConstraint->usable ){
idxDir = i;
seenDir = 0;
}else if( idxDir<0 ){
seenDir = 1;
}
break;
}
}
}
if( seenPath || seenDir ){
/* If input parameters are unusable, disallow this plan */
return SQLITE_CONSTRAINT;
}
if( idxPath<0 ){
pIdxInfo->idxNum = 0;
/* The pIdxInfo->estimatedCost should have been initialized to a huge
** number. Leave it unchanged. */
pIdxInfo->estimatedRows = 0x7fffffff;
}else{
pIdxInfo->aConstraintUsage[idxPath].omit = 1;
pIdxInfo->aConstraintUsage[idxPath].argvIndex = 1;
if( idxDir>=0 ){
pIdxInfo->aConstraintUsage[idxDir].omit = 1;
pIdxInfo->aConstraintUsage[idxDir].argvIndex = 2;
pIdxInfo->idxNum = 2;
pIdxInfo->estimatedCost = 10.0;
}else{
pIdxInfo->idxNum = 1;
pIdxInfo->estimatedCost = 100.0;
}
}
return SQLITE_OK;
}
/*
** Register the "fsdir" virtual table.
*/
static int fsdirRegister(sqlite3 *db){
static sqlite3_module fsdirModule = {
0, /* iVersion */
0, /* xCreate */
fsdirConnect, /* xConnect */
fsdirBestIndex, /* xBestIndex */
fsdirDisconnect, /* xDisconnect */
0, /* xDestroy */
fsdirOpen, /* xOpen - open a cursor */
fsdirClose, /* xClose - close a cursor */
fsdirFilter, /* xFilter - configure scan constraints */
fsdirNext, /* xNext - advance a cursor */
fsdirEof, /* xEof - check for end of scan */
fsdirColumn, /* xColumn - read data */
fsdirRowid, /* xRowid - read data */
0, /* xUpdate */
0, /* xBegin */
0, /* xSync */
0, /* xCommit */
0, /* xRollback */
0, /* xFindMethod */
0, /* xRename */
0, /* xSavepoint */
0, /* xRelease */
0, /* xRollbackTo */
0, /* xShadowName */
};
int rc = sqlite3_create_module(db, "fsdir", &fsdirModule, 0);
return rc;
}
#else /* SQLITE_OMIT_VIRTUALTABLE */
# define fsdirRegister(x) SQLITE_OK
#endif
int sqlite3_fileio_init(
sqlite3 *db,
char **pzErrMsg,
const sqlite3_api_routines *pApi
){
int rc = SQLITE_OK;
SQLITE_EXTENSION_INIT2(pApi);
(void)pzErrMsg; /* Unused parameter */
rc = sqlite3_create_function(db, "readfile", 1,
SQLITE_UTF8|SQLITE_DIRECTONLY, 0,
readfileFunc, 0, 0);
if( rc==SQLITE_OK ){
rc = sqlite3_create_function(db, "writefile", -1,
SQLITE_UTF8|SQLITE_DIRECTONLY, 0,
writefileFunc, 0, 0);
}
if( rc==SQLITE_OK ){
rc = sqlite3_create_function(db, "lsmode", 1, SQLITE_UTF8, 0,
lsModeFunc, 0, 0);
}
if( rc==SQLITE_OK ){
rc = fsdirRegister(db);
}
return rc;
}
| 25,083 | 874 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_write.shell.c | #include "third_party/sqlite3/fts3_write.c"
| 44 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_unicode2.c | /*
** 2012-05-25
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
*/
/*
** DO NOT EDIT THIS MACHINE GENERATED FILE.
*/
#ifndef SQLITE_DISABLE_FTS3_UNICODE
#if defined(SQLITE_ENABLE_FTS3) || defined(SQLITE_ENABLE_FTS4)
#include "libc/assert.h"
/*
** Return true if the argument corresponds to a unicode codepoint
** classified as either a letter or a number. Otherwise false.
**
** The results are undefined if the value passed to this function
** is less than zero.
*/
int sqlite3FtsUnicodeIsalnum(int c){
/* Each unsigned integer in the following array corresponds to a contiguous
** range of unicode codepoints that are not either letters or numbers (i.e.
** codepoints for which this function should return 0).
**
** The most significant 22 bits in each 32-bit value contain the first
** codepoint in the range. The least significant 10 bits are used to store
** the size of the range (always at least 1). In other words, the value
** ((C<<22) + N) represents a range of N codepoints starting with codepoint
** C. It is not possible to represent a range larger than 1023 codepoints
** using this format.
*/
static const unsigned int aEntry[] = {
0x00000030, 0x0000E807, 0x00016C06, 0x0001EC2F, 0x0002AC07,
0x0002D001, 0x0002D803, 0x0002EC01, 0x0002FC01, 0x00035C01,
0x0003DC01, 0x000B0804, 0x000B480E, 0x000B9407, 0x000BB401,
0x000BBC81, 0x000DD401, 0x000DF801, 0x000E1002, 0x000E1C01,
0x000FD801, 0x00120808, 0x00156806, 0x00162402, 0x00163C01,
0x00164437, 0x0017CC02, 0x00180005, 0x00181816, 0x00187802,
0x00192C15, 0x0019A804, 0x0019C001, 0x001B5001, 0x001B580F,
0x001B9C07, 0x001BF402, 0x001C000E, 0x001C3C01, 0x001C4401,
0x001CC01B, 0x001E980B, 0x001FAC09, 0x001FD804, 0x00205804,
0x00206C09, 0x00209403, 0x0020A405, 0x0020C00F, 0x00216403,
0x00217801, 0x0023901B, 0x00240004, 0x0024E803, 0x0024F812,
0x00254407, 0x00258804, 0x0025C001, 0x00260403, 0x0026F001,
0x0026F807, 0x00271C02, 0x00272C03, 0x00275C01, 0x00278802,
0x0027C802, 0x0027E802, 0x00280403, 0x0028F001, 0x0028F805,
0x00291C02, 0x00292C03, 0x00294401, 0x0029C002, 0x0029D401,
0x002A0403, 0x002AF001, 0x002AF808, 0x002B1C03, 0x002B2C03,
0x002B8802, 0x002BC002, 0x002C0403, 0x002CF001, 0x002CF807,
0x002D1C02, 0x002D2C03, 0x002D5802, 0x002D8802, 0x002DC001,
0x002E0801, 0x002EF805, 0x002F1803, 0x002F2804, 0x002F5C01,
0x002FCC08, 0x00300403, 0x0030F807, 0x00311803, 0x00312804,
0x00315402, 0x00318802, 0x0031FC01, 0x00320802, 0x0032F001,
0x0032F807, 0x00331803, 0x00332804, 0x00335402, 0x00338802,
0x00340802, 0x0034F807, 0x00351803, 0x00352804, 0x00355C01,
0x00358802, 0x0035E401, 0x00360802, 0x00372801, 0x00373C06,
0x00375801, 0x00376008, 0x0037C803, 0x0038C401, 0x0038D007,
0x0038FC01, 0x00391C09, 0x00396802, 0x003AC401, 0x003AD006,
0x003AEC02, 0x003B2006, 0x003C041F, 0x003CD00C, 0x003DC417,
0x003E340B, 0x003E6424, 0x003EF80F, 0x003F380D, 0x0040AC14,
0x00412806, 0x00415804, 0x00417803, 0x00418803, 0x00419C07,
0x0041C404, 0x0042080C, 0x00423C01, 0x00426806, 0x0043EC01,
0x004D740C, 0x004E400A, 0x00500001, 0x0059B402, 0x005A0001,
0x005A6C02, 0x005BAC03, 0x005C4803, 0x005CC805, 0x005D4802,
0x005DC802, 0x005ED023, 0x005F6004, 0x005F7401, 0x0060000F,
0x0062A401, 0x0064800C, 0x0064C00C, 0x00650001, 0x00651002,
0x0066C011, 0x00672002, 0x00677822, 0x00685C05, 0x00687802,
0x0069540A, 0x0069801D, 0x0069FC01, 0x006A8007, 0x006AA006,
0x006C0005, 0x006CD011, 0x006D6823, 0x006E0003, 0x006E840D,
0x006F980E, 0x006FF004, 0x00709014, 0x0070EC05, 0x0071F802,
0x00730008, 0x00734019, 0x0073B401, 0x0073C803, 0x00770027,
0x0077F004, 0x007EF401, 0x007EFC03, 0x007F3403, 0x007F7403,
0x007FB403, 0x007FF402, 0x00800065, 0x0081A806, 0x0081E805,
0x00822805, 0x0082801A, 0x00834021, 0x00840002, 0x00840C04,
0x00842002, 0x00845001, 0x00845803, 0x00847806, 0x00849401,
0x00849C01, 0x0084A401, 0x0084B801, 0x0084E802, 0x00850005,
0x00852804, 0x00853C01, 0x00864264, 0x00900027, 0x0091000B,
0x0092704E, 0x00940200, 0x009C0475, 0x009E53B9, 0x00AD400A,
0x00B39406, 0x00B3BC03, 0x00B3E404, 0x00B3F802, 0x00B5C001,
0x00B5FC01, 0x00B7804F, 0x00B8C00C, 0x00BA001A, 0x00BA6C59,
0x00BC00D6, 0x00BFC00C, 0x00C00005, 0x00C02019, 0x00C0A807,
0x00C0D802, 0x00C0F403, 0x00C26404, 0x00C28001, 0x00C3EC01,
0x00C64002, 0x00C6580A, 0x00C70024, 0x00C8001F, 0x00C8A81E,
0x00C94001, 0x00C98020, 0x00CA2827, 0x00CB003F, 0x00CC0100,
0x01370040, 0x02924037, 0x0293F802, 0x02983403, 0x0299BC10,
0x029A7C01, 0x029BC008, 0x029C0017, 0x029C8002, 0x029E2402,
0x02A00801, 0x02A01801, 0x02A02C01, 0x02A08C09, 0x02A0D804,
0x02A1D004, 0x02A20002, 0x02A2D011, 0x02A33802, 0x02A38012,
0x02A3E003, 0x02A4980A, 0x02A51C0D, 0x02A57C01, 0x02A60004,
0x02A6CC1B, 0x02A77802, 0x02A8A40E, 0x02A90C01, 0x02A93002,
0x02A97004, 0x02A9DC03, 0x02A9EC01, 0x02AAC001, 0x02AAC803,
0x02AADC02, 0x02AAF802, 0x02AB0401, 0x02AB7802, 0x02ABAC07,
0x02ABD402, 0x02AF8C0B, 0x03600001, 0x036DFC02, 0x036FFC02,
0x037FFC01, 0x03EC7801, 0x03ECA401, 0x03EEC810, 0x03F4F802,
0x03F7F002, 0x03F8001A, 0x03F88007, 0x03F8C023, 0x03F95013,
0x03F9A004, 0x03FBFC01, 0x03FC040F, 0x03FC6807, 0x03FCEC06,
0x03FD6C0B, 0x03FF8007, 0x03FFA007, 0x03FFE405, 0x04040003,
0x0404DC09, 0x0405E411, 0x0406400C, 0x0407402E, 0x040E7C01,
0x040F4001, 0x04215C01, 0x04247C01, 0x0424FC01, 0x04280403,
0x04281402, 0x04283004, 0x0428E003, 0x0428FC01, 0x04294009,
0x0429FC01, 0x042CE407, 0x04400003, 0x0440E016, 0x04420003,
0x0442C012, 0x04440003, 0x04449C0E, 0x04450004, 0x04460003,
0x0446CC0E, 0x04471404, 0x045AAC0D, 0x0491C004, 0x05BD442E,
0x05BE3C04, 0x074000F6, 0x07440027, 0x0744A4B5, 0x07480046,
0x074C0057, 0x075B0401, 0x075B6C01, 0x075BEC01, 0x075C5401,
0x075CD401, 0x075D3C01, 0x075DBC01, 0x075E2401, 0x075EA401,
0x075F0C01, 0x07BBC002, 0x07C0002C, 0x07C0C064, 0x07C2800F,
0x07C2C40E, 0x07C3040F, 0x07C3440F, 0x07C4401F, 0x07C4C03C,
0x07C5C02B, 0x07C7981D, 0x07C8402B, 0x07C90009, 0x07C94002,
0x07CC0021, 0x07CCC006, 0x07CCDC46, 0x07CE0014, 0x07CE8025,
0x07CF1805, 0x07CF8011, 0x07D0003F, 0x07D10001, 0x07D108B6,
0x07D3E404, 0x07D4003E, 0x07D50004, 0x07D54018, 0x07D7EC46,
0x07D9140B, 0x07DA0046, 0x07DC0074, 0x38000401, 0x38008060,
0x380400F0,
};
static const unsigned int aAscii[4] = {
0xFFFFFFFF, 0xFC00FFFF, 0xF8000001, 0xF8000001,
};
if( (unsigned int)c<128 ){
return ( (aAscii[c >> 5] & ((unsigned int)1 << (c & 0x001F)))==0 );
}else if( (unsigned int)c<(1<<22) ){
unsigned int key = (((unsigned int)c)<<10) | 0x000003FF;
int iRes = 0;
int iHi = sizeof(aEntry)/sizeof(aEntry[0]) - 1;
int iLo = 0;
while( iHi>=iLo ){
int iTest = (iHi + iLo) / 2;
if( key >= aEntry[iTest] ){
iRes = iTest;
iLo = iTest+1;
}else{
iHi = iTest-1;
}
}
assert( aEntry[0]<key );
assert( key>=aEntry[iRes] );
return (((unsigned int)c) >= ((aEntry[iRes]>>10) + (aEntry[iRes]&0x3FF)));
}
return 1;
}
/*
** If the argument is a codepoint corresponding to a lowercase letter
** in the ASCII range with a diacritic added, return the codepoint
** of the ASCII letter only. For example, if passed 235 - "LATIN
** SMALL LETTER E WITH DIAERESIS" - return 65 ("LATIN SMALL LETTER
** E"). The resuls of passing a codepoint that corresponds to an
** uppercase letter are undefined.
*/
static int remove_diacritic(int c, int bComplex){
unsigned short aDia[] = {
0, 1797, 1848, 1859, 1891, 1928, 1940, 1995,
2024, 2040, 2060, 2110, 2168, 2206, 2264, 2286,
2344, 2383, 2472, 2488, 2516, 2596, 2668, 2732,
2782, 2842, 2894, 2954, 2984, 3000, 3028, 3336,
3456, 3696, 3712, 3728, 3744, 3766, 3832, 3896,
3912, 3928, 3944, 3968, 4008, 4040, 4056, 4106,
4138, 4170, 4202, 4234, 4266, 4296, 4312, 4344,
4408, 4424, 4442, 4472, 4488, 4504, 6148, 6198,
6264, 6280, 6360, 6429, 6505, 6529, 61448, 61468,
61512, 61534, 61592, 61610, 61642, 61672, 61688, 61704,
61726, 61784, 61800, 61816, 61836, 61880, 61896, 61914,
61948, 61998, 62062, 62122, 62154, 62184, 62200, 62218,
62252, 62302, 62364, 62410, 62442, 62478, 62536, 62554,
62584, 62604, 62640, 62648, 62656, 62664, 62730, 62766,
62830, 62890, 62924, 62974, 63032, 63050, 63082, 63118,
63182, 63242, 63274, 63310, 63368, 63390,
};
#define HIBIT ((unsigned char)0x80)
unsigned char aChar[] = {
'\0', 'a', 'c', 'e', 'i', 'n',
'o', 'u', 'y', 'y', 'a', 'c',
'd', 'e', 'e', 'g', 'h', 'i',
'j', 'k', 'l', 'n', 'o', 'r',
's', 't', 'u', 'u', 'w', 'y',
'z', 'o', 'u', 'a', 'i', 'o',
'u', 'u'|HIBIT, 'a'|HIBIT, 'g', 'k', 'o',
'o'|HIBIT, 'j', 'g', 'n', 'a'|HIBIT, 'a',
'e', 'i', 'o', 'r', 'u', 's',
't', 'h', 'a', 'e', 'o'|HIBIT, 'o',
'o'|HIBIT, 'y', '\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0', 'a', 'b',
'c'|HIBIT, 'd', 'd', 'e'|HIBIT, 'e', 'e'|HIBIT,
'f', 'g', 'h', 'h', 'i', 'i'|HIBIT,
'k', 'l', 'l'|HIBIT, 'l', 'm', 'n',
'o'|HIBIT, 'p', 'r', 'r'|HIBIT, 'r', 's',
's'|HIBIT, 't', 'u', 'u'|HIBIT, 'v', 'w',
'w', 'x', 'y', 'z', 'h', 't',
'w', 'y', 'a', 'a'|HIBIT, 'a'|HIBIT, 'a'|HIBIT,
'e', 'e'|HIBIT, 'e'|HIBIT, 'i', 'o', 'o'|HIBIT,
'o'|HIBIT, 'o'|HIBIT, 'u', 'u'|HIBIT, 'u'|HIBIT, 'y',
};
unsigned int key = (((unsigned int)c)<<3) | 0x00000007;
int iRes = 0;
int iHi = sizeof(aDia)/sizeof(aDia[0]) - 1;
int iLo = 0;
while( iHi>=iLo ){
int iTest = (iHi + iLo) / 2;
if( key >= aDia[iTest] ){
iRes = iTest;
iLo = iTest+1;
}else{
iHi = iTest-1;
}
}
assert( key>=aDia[iRes] );
if( bComplex==0 && (aChar[iRes] & 0x80) ) return c;
return (c > (aDia[iRes]>>3) + (aDia[iRes]&0x07)) ? c : ((int)aChar[iRes] & 0x7F);
}
/*
** Return true if the argument interpreted as a unicode codepoint
** is a diacritical modifier character.
*/
int sqlite3FtsUnicodeIsdiacritic(int c){
unsigned int mask0 = 0x08029FDF;
unsigned int mask1 = 0x000361F8;
if( c<768 || c>817 ) return 0;
return (c < 768+32) ?
(mask0 & ((unsigned int)1 << (c-768))) :
(mask1 & ((unsigned int)1 << (c-768-32)));
}
/*
** Interpret the argument as a unicode codepoint. If the codepoint
** is an upper case character that has a lower case equivalent,
** return the codepoint corresponding to the lower case version.
** Otherwise, return a copy of the argument.
**
** The results are undefined if the value passed to this function
** is less than zero.
*/
int sqlite3FtsUnicodeFold(int c, int eRemoveDiacritic){
/* Each entry in the following array defines a rule for folding a range
** of codepoints to lower case. The rule applies to a range of nRange
** codepoints starting at codepoint iCode.
**
** If the least significant bit in flags is clear, then the rule applies
** to all nRange codepoints (i.e. all nRange codepoints are upper case and
** need to be folded). Or, if it is set, then the rule only applies to
** every second codepoint in the range, starting with codepoint C.
**
** The 7 most significant bits in flags are an index into the aiOff[]
** array. If a specific codepoint C does require folding, then its lower
** case equivalent is ((C + aiOff[flags>>1]) & 0xFFFF).
**
** The contents of this array are generated by parsing the CaseFolding.txt
** file distributed as part of the "Unicode Character Database". See
** http://www.unicode.org for details.
*/
static const struct TableEntry {
unsigned short iCode;
unsigned char flags;
unsigned char nRange;
} aEntry[] = {
{65, 14, 26}, {181, 64, 1}, {192, 14, 23},
{216, 14, 7}, {256, 1, 48}, {306, 1, 6},
{313, 1, 16}, {330, 1, 46}, {376, 116, 1},
{377, 1, 6}, {383, 104, 1}, {385, 50, 1},
{386, 1, 4}, {390, 44, 1}, {391, 0, 1},
{393, 42, 2}, {395, 0, 1}, {398, 32, 1},
{399, 38, 1}, {400, 40, 1}, {401, 0, 1},
{403, 42, 1}, {404, 46, 1}, {406, 52, 1},
{407, 48, 1}, {408, 0, 1}, {412, 52, 1},
{413, 54, 1}, {415, 56, 1}, {416, 1, 6},
{422, 60, 1}, {423, 0, 1}, {425, 60, 1},
{428, 0, 1}, {430, 60, 1}, {431, 0, 1},
{433, 58, 2}, {435, 1, 4}, {439, 62, 1},
{440, 0, 1}, {444, 0, 1}, {452, 2, 1},
{453, 0, 1}, {455, 2, 1}, {456, 0, 1},
{458, 2, 1}, {459, 1, 18}, {478, 1, 18},
{497, 2, 1}, {498, 1, 4}, {502, 122, 1},
{503, 134, 1}, {504, 1, 40}, {544, 110, 1},
{546, 1, 18}, {570, 70, 1}, {571, 0, 1},
{573, 108, 1}, {574, 68, 1}, {577, 0, 1},
{579, 106, 1}, {580, 28, 1}, {581, 30, 1},
{582, 1, 10}, {837, 36, 1}, {880, 1, 4},
{886, 0, 1}, {902, 18, 1}, {904, 16, 3},
{908, 26, 1}, {910, 24, 2}, {913, 14, 17},
{931, 14, 9}, {962, 0, 1}, {975, 4, 1},
{976, 140, 1}, {977, 142, 1}, {981, 146, 1},
{982, 144, 1}, {984, 1, 24}, {1008, 136, 1},
{1009, 138, 1}, {1012, 130, 1}, {1013, 128, 1},
{1015, 0, 1}, {1017, 152, 1}, {1018, 0, 1},
{1021, 110, 3}, {1024, 34, 16}, {1040, 14, 32},
{1120, 1, 34}, {1162, 1, 54}, {1216, 6, 1},
{1217, 1, 14}, {1232, 1, 88}, {1329, 22, 38},
{4256, 66, 38}, {4295, 66, 1}, {4301, 66, 1},
{7680, 1, 150}, {7835, 132, 1}, {7838, 96, 1},
{7840, 1, 96}, {7944, 150, 8}, {7960, 150, 6},
{7976, 150, 8}, {7992, 150, 8}, {8008, 150, 6},
{8025, 151, 8}, {8040, 150, 8}, {8072, 150, 8},
{8088, 150, 8}, {8104, 150, 8}, {8120, 150, 2},
{8122, 126, 2}, {8124, 148, 1}, {8126, 100, 1},
{8136, 124, 4}, {8140, 148, 1}, {8152, 150, 2},
{8154, 120, 2}, {8168, 150, 2}, {8170, 118, 2},
{8172, 152, 1}, {8184, 112, 2}, {8186, 114, 2},
{8188, 148, 1}, {8486, 98, 1}, {8490, 92, 1},
{8491, 94, 1}, {8498, 12, 1}, {8544, 8, 16},
{8579, 0, 1}, {9398, 10, 26}, {11264, 22, 47},
{11360, 0, 1}, {11362, 88, 1}, {11363, 102, 1},
{11364, 90, 1}, {11367, 1, 6}, {11373, 84, 1},
{11374, 86, 1}, {11375, 80, 1}, {11376, 82, 1},
{11378, 0, 1}, {11381, 0, 1}, {11390, 78, 2},
{11392, 1, 100}, {11499, 1, 4}, {11506, 0, 1},
{42560, 1, 46}, {42624, 1, 24}, {42786, 1, 14},
{42802, 1, 62}, {42873, 1, 4}, {42877, 76, 1},
{42878, 1, 10}, {42891, 0, 1}, {42893, 74, 1},
{42896, 1, 4}, {42912, 1, 10}, {42922, 72, 1},
{65313, 14, 26},
};
static const unsigned short aiOff[] = {
1, 2, 8, 15, 16, 26, 28, 32,
37, 38, 40, 48, 63, 64, 69, 71,
79, 80, 116, 202, 203, 205, 206, 207,
209, 210, 211, 213, 214, 217, 218, 219,
775, 7264, 10792, 10795, 23228, 23256, 30204, 54721,
54753, 54754, 54756, 54787, 54793, 54809, 57153, 57274,
57921, 58019, 58363, 61722, 65268, 65341, 65373, 65406,
65408, 65410, 65415, 65424, 65436, 65439, 65450, 65462,
65472, 65476, 65478, 65480, 65482, 65488, 65506, 65511,
65514, 65521, 65527, 65528, 65529,
};
int ret = c;
assert( sizeof(unsigned short)==2 && sizeof(unsigned char)==1 );
if( c<128 ){
if( c>='A' && c<='Z' ) ret = c + ('a' - 'A');
}else if( c<65536 ){
const struct TableEntry *p;
int iHi = sizeof(aEntry)/sizeof(aEntry[0]) - 1;
int iLo = 0;
int iRes = -1;
assert( c>aEntry[0].iCode );
while( iHi>=iLo ){
int iTest = (iHi + iLo) / 2;
int cmp = (c - aEntry[iTest].iCode);
if( cmp>=0 ){
iRes = iTest;
iLo = iTest+1;
}else{
iHi = iTest-1;
}
}
assert( iRes>=0 && c>=aEntry[iRes].iCode );
p = &aEntry[iRes];
if( c<(p->iCode + p->nRange) && 0==(0x01 & p->flags & (p->iCode ^ c)) ){
ret = (c + (aiOff[p->flags>>1])) & 0x0000FFFF;
assert( ret>0 );
}
if( eRemoveDiacritic ){
ret = remove_diacritic(ret, eRemoveDiacritic==2);
}
}
else if( c>=66560 && c<66600 ){
ret = c + 40;
}
return ret;
}
#endif /* defined(SQLITE_ENABLE_FTS3) || defined(SQLITE_ENABLE_FTS4) */
#endif /* !defined(SQLITE_DISABLE_FTS3_UNICODE) */
| 17,912 | 384 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_tokenizer1.shell.c | #include "third_party/sqlite3/fts3_tokenizer1.c"
| 49 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/random.shell.c | #include "third_party/sqlite3/random.c"
| 40 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/auth.shell.c | #include "third_party/sqlite3/auth.c"
| 38 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/vdbevtab.c | /*
** 2020-03-23
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file implements virtual-tables for examining the bytecode content
** of a prepared statement.
*/
#include "third_party/sqlite3/sqliteInt.h"
#if defined(SQLITE_ENABLE_BYTECODE_VTAB) && !defined(SQLITE_OMIT_VIRTUALTABLE)
#include "third_party/sqlite3/vdbeInt.inc"
/* An instance of the bytecode() table-valued function.
*/
typedef struct bytecodevtab bytecodevtab;
struct bytecodevtab {
sqlite3_vtab base; /* Base class - must be first */
sqlite3 *db; /* Database connection */
int bTablesUsed; /* 2 for tables_used(). 0 for bytecode(). */
};
/* A cursor for scanning through the bytecode
*/
typedef struct bytecodevtab_cursor bytecodevtab_cursor;
struct bytecodevtab_cursor {
sqlite3_vtab_cursor base; /* Base class - must be first */
sqlite3_stmt *pStmt; /* The statement whose bytecode is displayed */
int iRowid; /* The rowid of the output table */
int iAddr; /* Address */
int needFinalize; /* Cursors owns pStmt and must finalize it */
int showSubprograms; /* Provide a listing of subprograms */
Op *aOp; /* Operand array */
char *zP4; /* Rendered P4 value */
const char *zType; /* tables_used.type */
const char *zSchema; /* tables_used.schema */
const char *zName; /* tables_used.name */
Mem sub; /* Subprograms */
};
/*
** Create a new bytecode() table-valued function.
*/
static int bytecodevtabConnect(
sqlite3 *db,
void *pAux,
int argc, const char *const*argv,
sqlite3_vtab **ppVtab,
char **pzErr
){
bytecodevtab *pNew;
int rc;
int isTabUsed = pAux!=0;
const char *azSchema[2] = {
/* bytecode() schema */
"CREATE TABLE x("
"addr INT,"
"opcode TEXT,"
"p1 INT,"
"p2 INT,"
"p3 INT,"
"p4 TEXT,"
"p5 INT,"
"comment TEXT,"
"subprog TEXT,"
"stmt HIDDEN"
");",
/* Tables_used() schema */
"CREATE TABLE x("
"type TEXT,"
"schema TEXT,"
"name TEXT,"
"wr INT,"
"subprog TEXT,"
"stmt HIDDEN"
");"
};
rc = sqlite3_declare_vtab(db, azSchema[isTabUsed]);
if( rc==SQLITE_OK ){
pNew = sqlite3_malloc( sizeof(*pNew) );
*ppVtab = (sqlite3_vtab*)pNew;
if( pNew==0 ) return SQLITE_NOMEM;
memset(pNew, 0, sizeof(*pNew));
pNew->db = db;
pNew->bTablesUsed = isTabUsed*2;
}
return rc;
}
/*
** This method is the destructor for bytecodevtab objects.
*/
static int bytecodevtabDisconnect(sqlite3_vtab *pVtab){
bytecodevtab *p = (bytecodevtab*)pVtab;
sqlite3_free(p);
return SQLITE_OK;
}
/*
** Constructor for a new bytecodevtab_cursor object.
*/
static int bytecodevtabOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
bytecodevtab *pVTab = (bytecodevtab*)p;
bytecodevtab_cursor *pCur;
pCur = sqlite3_malloc( sizeof(*pCur) );
if( pCur==0 ) return SQLITE_NOMEM;
memset(pCur, 0, sizeof(*pCur));
sqlite3VdbeMemInit(&pCur->sub, pVTab->db, 1);
*ppCursor = &pCur->base;
return SQLITE_OK;
}
/*
** Clear all internal content from a bytecodevtab cursor.
*/
static void bytecodevtabCursorClear(bytecodevtab_cursor *pCur){
sqlite3_free(pCur->zP4);
pCur->zP4 = 0;
sqlite3VdbeMemRelease(&pCur->sub);
sqlite3VdbeMemSetNull(&pCur->sub);
if( pCur->needFinalize ){
sqlite3_finalize(pCur->pStmt);
}
pCur->pStmt = 0;
pCur->needFinalize = 0;
pCur->zType = 0;
pCur->zSchema = 0;
pCur->zName = 0;
}
/*
** Destructor for a bytecodevtab_cursor.
*/
static int bytecodevtabClose(sqlite3_vtab_cursor *cur){
bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
bytecodevtabCursorClear(pCur);
sqlite3_free(pCur);
return SQLITE_OK;
}
/*
** Advance a bytecodevtab_cursor to its next row of output.
*/
static int bytecodevtabNext(sqlite3_vtab_cursor *cur){
bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
bytecodevtab *pTab = (bytecodevtab*)cur->pVtab;
int rc;
if( pCur->zP4 ){
sqlite3_free(pCur->zP4);
pCur->zP4 = 0;
}
if( pCur->zName ){
pCur->zName = 0;
pCur->zType = 0;
pCur->zSchema = 0;
}
rc = sqlite3VdbeNextOpcode(
(Vdbe*)pCur->pStmt,
pCur->showSubprograms ? &pCur->sub : 0,
pTab->bTablesUsed,
&pCur->iRowid,
&pCur->iAddr,
&pCur->aOp);
if( rc!=SQLITE_OK ){
sqlite3VdbeMemSetNull(&pCur->sub);
pCur->aOp = 0;
}
return SQLITE_OK;
}
/*
** Return TRUE if the cursor has been moved off of the last
** row of output.
*/
static int bytecodevtabEof(sqlite3_vtab_cursor *cur){
bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
return pCur->aOp==0;
}
/*
** Return values of columns for the row at which the bytecodevtab_cursor
** is currently pointing.
*/
static int bytecodevtabColumn(
sqlite3_vtab_cursor *cur, /* The cursor */
sqlite3_context *ctx, /* First argument to sqlite3_result_...() */
int i /* Which column to return */
){
bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
bytecodevtab *pVTab = (bytecodevtab*)cur->pVtab;
Op *pOp = pCur->aOp + pCur->iAddr;
if( pVTab->bTablesUsed ){
if( i==4 ){
i = 8;
}else{
if( i<=2 && pCur->zType==0 ){
Schema *pSchema;
HashElem *k;
int iDb = pOp->p3;
Pgno iRoot = (Pgno)pOp->p2;
sqlite3 *db = pVTab->db;
pSchema = db->aDb[iDb].pSchema;
pCur->zSchema = db->aDb[iDb].zDbSName;
for(k=sqliteHashFirst(&pSchema->tblHash); k; k=sqliteHashNext(k)){
Table *pTab = (Table*)sqliteHashData(k);
if( !IsVirtual(pTab) && pTab->tnum==iRoot ){
pCur->zName = pTab->zName;
pCur->zType = "table";
break;
}
}
if( pCur->zName==0 ){
for(k=sqliteHashFirst(&pSchema->idxHash); k; k=sqliteHashNext(k)){
Index *pIdx = (Index*)sqliteHashData(k);
if( pIdx->tnum==iRoot ){
pCur->zName = pIdx->zName;
pCur->zType = "index";
}
}
}
}
i += 10;
}
}
switch( i ){
case 0: /* addr */
sqlite3_result_int(ctx, pCur->iAddr);
break;
case 1: /* opcode */
sqlite3_result_text(ctx, (char*)sqlite3OpcodeName(pOp->opcode),
-1, SQLITE_STATIC);
break;
case 2: /* p1 */
sqlite3_result_int(ctx, pOp->p1);
break;
case 3: /* p2 */
sqlite3_result_int(ctx, pOp->p2);
break;
case 4: /* p3 */
sqlite3_result_int(ctx, pOp->p3);
break;
case 5: /* p4 */
case 7: /* comment */
if( pCur->zP4==0 ){
pCur->zP4 = sqlite3VdbeDisplayP4(pVTab->db, pOp);
}
if( i==5 ){
sqlite3_result_text(ctx, pCur->zP4, -1, SQLITE_STATIC);
}else{
#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
char *zCom = sqlite3VdbeDisplayComment(pVTab->db, pOp, pCur->zP4);
sqlite3_result_text(ctx, zCom, -1, sqlite3_free);
#endif
}
break;
case 6: /* p5 */
sqlite3_result_int(ctx, pOp->p5);
break;
case 8: { /* subprog */
Op *aOp = pCur->aOp;
assert( aOp[0].opcode==OP_Init );
assert( aOp[0].p4.z==0 || strncmp(aOp[0].p4.z,"-" "- ",3)==0 );
if( pCur->iRowid==pCur->iAddr+1 ){
break; /* Result is NULL for the main program */
}else if( aOp[0].p4.z!=0 ){
sqlite3_result_text(ctx, aOp[0].p4.z+3, -1, SQLITE_STATIC);
}else{
sqlite3_result_text(ctx, "(FK)", 4, SQLITE_STATIC);
}
break;
}
case 10: /* tables_used.type */
sqlite3_result_text(ctx, pCur->zType, -1, SQLITE_STATIC);
break;
case 11: /* tables_used.schema */
sqlite3_result_text(ctx, pCur->zSchema, -1, SQLITE_STATIC);
break;
case 12: /* tables_used.name */
sqlite3_result_text(ctx, pCur->zName, -1, SQLITE_STATIC);
break;
case 13: /* tables_used.wr */
sqlite3_result_int(ctx, pOp->opcode==OP_OpenWrite);
break;
}
return SQLITE_OK;
}
/*
** Return the rowid for the current row. In this implementation, the
** rowid is the same as the output value.
*/
static int bytecodevtabRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
bytecodevtab_cursor *pCur = (bytecodevtab_cursor*)cur;
*pRowid = pCur->iRowid;
return SQLITE_OK;
}
/*
** Initialize a cursor.
**
** idxNum==0 means show all subprograms
** idxNum==1 means show only the main bytecode and omit subprograms.
*/
static int bytecodevtabFilter(
sqlite3_vtab_cursor *pVtabCursor,
int idxNum, const char *idxStr,
int argc, sqlite3_value **argv
){
bytecodevtab_cursor *pCur = (bytecodevtab_cursor *)pVtabCursor;
bytecodevtab *pVTab = (bytecodevtab *)pVtabCursor->pVtab;
int rc = SQLITE_OK;
bytecodevtabCursorClear(pCur);
pCur->iRowid = 0;
pCur->iAddr = 0;
pCur->showSubprograms = idxNum==0;
assert( argc==1 );
if( sqlite3_value_type(argv[0])==SQLITE_TEXT ){
const char *zSql = (const char*)sqlite3_value_text(argv[0]);
if( zSql==0 ){
rc = SQLITE_NOMEM;
}else{
rc = sqlite3_prepare_v2(pVTab->db, zSql, -1, &pCur->pStmt, 0);
pCur->needFinalize = 1;
}
}else{
pCur->pStmt = (sqlite3_stmt*)sqlite3_value_pointer(argv[0],"stmt-pointer");
}
if( pCur->pStmt==0 ){
pVTab->base.zErrMsg = sqlite3_mprintf(
"argument to %s() is not a valid SQL statement",
pVTab->bTablesUsed ? "tables_used" : "bytecode"
);
rc = SQLITE_ERROR;
}else{
bytecodevtabNext(pVtabCursor);
}
return rc;
}
/*
** We must have a single stmt=? constraint that will be passed through
** into the xFilter method. If there is no valid stmt=? constraint,
** then return an SQLITE_CONSTRAINT error.
*/
static int bytecodevtabBestIndex(
sqlite3_vtab *tab,
sqlite3_index_info *pIdxInfo
){
int i;
int rc = SQLITE_CONSTRAINT;
struct sqlite3_index_constraint *p;
bytecodevtab *pVTab = (bytecodevtab*)tab;
int iBaseCol = pVTab->bTablesUsed ? 4 : 8;
pIdxInfo->estimatedCost = (double)100;
pIdxInfo->estimatedRows = 100;
pIdxInfo->idxNum = 0;
for(i=0, p=pIdxInfo->aConstraint; i<pIdxInfo->nConstraint; i++, p++){
if( p->usable==0 ) continue;
if( p->op==SQLITE_INDEX_CONSTRAINT_EQ && p->iColumn==iBaseCol+1 ){
rc = SQLITE_OK;
pIdxInfo->aConstraintUsage[i].omit = 1;
pIdxInfo->aConstraintUsage[i].argvIndex = 1;
}
if( p->op==SQLITE_INDEX_CONSTRAINT_ISNULL && p->iColumn==iBaseCol ){
pIdxInfo->aConstraintUsage[i].omit = 1;
pIdxInfo->idxNum = 1;
}
}
return rc;
}
/*
** This following structure defines all the methods for the
** virtual table.
*/
static sqlite3_module bytecodevtabModule = {
/* iVersion */ 0,
/* xCreate */ 0,
/* xConnect */ bytecodevtabConnect,
/* xBestIndex */ bytecodevtabBestIndex,
/* xDisconnect */ bytecodevtabDisconnect,
/* xDestroy */ 0,
/* xOpen */ bytecodevtabOpen,
/* xClose */ bytecodevtabClose,
/* xFilter */ bytecodevtabFilter,
/* xNext */ bytecodevtabNext,
/* xEof */ bytecodevtabEof,
/* xColumn */ bytecodevtabColumn,
/* xRowid */ bytecodevtabRowid,
/* xUpdate */ 0,
/* xBegin */ 0,
/* xSync */ 0,
/* xCommit */ 0,
/* xRollback */ 0,
/* xFindMethod */ 0,
/* xRename */ 0,
/* xSavepoint */ 0,
/* xRelease */ 0,
/* xRollbackTo */ 0,
/* xShadowName */ 0
};
int sqlite3VdbeBytecodeVtabInit(sqlite3 *db){
int rc;
rc = sqlite3_create_module(db, "bytecode", &bytecodevtabModule, 0);
if( rc==SQLITE_OK ){
rc = sqlite3_create_module(db, "tables_used", &bytecodevtabModule, &db);
}
return rc;
}
#elif defined(SQLITE_ENABLE_BYTECODE_VTAB)
int sqlite3VdbeBytecodeVtabInit(sqlite3 *db){ return SQLITE_OK; }
#endif /* SQLITE_ENABLE_BYTECODE_VTAB */
| 12,200 | 425 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/completion.shell.c | #include "third_party/sqlite3/completion.c"
| 44 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/vdbesort.shell.c | #include "third_party/sqlite3/vdbesort.c"
| 42 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/sqlite3session.h |
#if !defined(__SQLITESESSION_H_) && defined(SQLITE_ENABLE_SESSION)
#define __SQLITESESSION_H_ 1
/*
** Make sure we can call this stuff from C++.
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "third_party/sqlite3/sqlite3.h"
/*
** CAPI3REF: Session Object Handle
**
** An instance of this object is a [session] that can be used to
** record changes to a database.
*/
typedef struct sqlite3_session sqlite3_session;
/*
** CAPI3REF: Changeset Iterator Handle
**
** An instance of this object acts as a cursor for iterating
** over the elements of a [changeset] or [patchset].
*/
typedef struct sqlite3_changeset_iter sqlite3_changeset_iter;
/*
** CAPI3REF: Create A New Session Object
** CONSTRUCTOR: sqlite3_session
**
** Create a new session object attached to database handle db. If successful,
** a pointer to the new object is written to *ppSession and SQLITE_OK is
** returned. If an error occurs, *ppSession is set to NULL and an SQLite
** error code (e.g. SQLITE_NOMEM) is returned.
**
** It is possible to create multiple session objects attached to a single
** database handle.
**
** Session objects created using this function should be deleted using the
** [sqlite3session_delete()] function before the database handle that they
** are attached to is itself closed. If the database handle is closed before
** the session object is deleted, then the results of calling any session
** module function, including [sqlite3session_delete()] on the session object
** are undefined.
**
** Because the session module uses the [sqlite3_preupdate_hook()] API, it
** is not possible for an application to register a pre-update hook on a
** database handle that has one or more session objects attached. Nor is
** it possible to create a session object attached to a database handle for
** which a pre-update hook is already defined. The results of attempting
** either of these things are undefined.
**
** The session object will be used to create changesets for tables in
** database zDb, where zDb is either "main", or "temp", or the name of an
** attached database. It is not an error if database zDb is not attached
** to the database when the session object is created.
*/
int sqlite3session_create(
sqlite3 *db, /* Database handle */
const char *zDb, /* Name of db (e.g. "main") */
sqlite3_session **ppSession /* OUT: New session object */
);
/*
** CAPI3REF: Delete A Session Object
** DESTRUCTOR: sqlite3_session
**
** Delete a session object previously allocated using
** [sqlite3session_create()]. Once a session object has been deleted, the
** results of attempting to use pSession with any other session module
** function are undefined.
**
** Session objects must be deleted before the database handle to which they
** are attached is closed. Refer to the documentation for
** [sqlite3session_create()] for details.
*/
void sqlite3session_delete(sqlite3_session *pSession);
/*
** CAPIREF: Conigure a Session Object
** METHOD: sqlite3_session
**
** This method is used to configure a session object after it has been
** created. At present the only valid value for the second parameter is
** [SQLITE_SESSION_OBJCONFIG_SIZE].
**
** Arguments for sqlite3session_object_config()
**
** The following values may passed as the the 4th parameter to
** sqlite3session_object_config().
**
** <dt>SQLITE_SESSION_OBJCONFIG_SIZE <dd>
** This option is used to set, clear or query the flag that enables
** the [sqlite3session_changeset_size()] API. Because it imposes some
** computational overhead, this API is disabled by default. Argument
** pArg must point to a value of type (int). If the value is initially
** 0, then the sqlite3session_changeset_size() API is disabled. If it
** is greater than 0, then the same API is enabled. Or, if the initial
** value is less than zero, no change is made. In all cases the (int)
** variable is set to 1 if the sqlite3session_changeset_size() API is
** enabled following the current call, or 0 otherwise.
**
** It is an error (SQLITE_MISUSE) to attempt to modify this setting after
** the first table has been attached to the session object.
*/
int sqlite3session_object_config(sqlite3_session*, int op, void *pArg);
/*
*/
#define SQLITE_SESSION_OBJCONFIG_SIZE 1
/*
** CAPI3REF: Enable Or Disable A Session Object
** METHOD: sqlite3_session
**
** Enable or disable the recording of changes by a session object. When
** enabled, a session object records changes made to the database. When
** disabled - it does not. A newly created session object is enabled.
** Refer to the documentation for [sqlite3session_changeset()] for further
** details regarding how enabling and disabling a session object affects
** the eventual changesets.
**
** Passing zero to this function disables the session. Passing a value
** greater than zero enables it. Passing a value less than zero is a
** no-op, and may be used to query the current state of the session.
**
** The return value indicates the final state of the session object: 0 if
** the session is disabled, or 1 if it is enabled.
*/
int sqlite3session_enable(sqlite3_session *pSession, int bEnable);
/*
** CAPI3REF: Set Or Clear the Indirect Change Flag
** METHOD: sqlite3_session
**
** Each change recorded by a session object is marked as either direct or
** indirect. A change is marked as indirect if either:
**
** <ul>
** <li> The session object "indirect" flag is set when the change is
** made, or
** <li> The change is made by an SQL trigger or foreign key action
** instead of directly as a result of a users SQL statement.
** </ul>
**
** If a single row is affected by more than one operation within a session,
** then the change is considered indirect if all operations meet the criteria
** for an indirect change above, or direct otherwise.
**
** This function is used to set, clear or query the session object indirect
** flag. If the second argument passed to this function is zero, then the
** indirect flag is cleared. If it is greater than zero, the indirect flag
** is set. Passing a value less than zero does not modify the current value
** of the indirect flag, and may be used to query the current state of the
** indirect flag for the specified session object.
**
** The return value indicates the final state of the indirect flag: 0 if
** it is clear, or 1 if it is set.
*/
int sqlite3session_indirect(sqlite3_session *pSession, int bIndirect);
/*
** CAPI3REF: Attach A Table To A Session Object
** METHOD: sqlite3_session
**
** If argument zTab is not NULL, then it is the name of a table to attach
** to the session object passed as the first argument. All subsequent changes
** made to the table while the session object is enabled will be recorded. See
** documentation for [sqlite3session_changeset()] for further details.
**
** Or, if argument zTab is NULL, then changes are recorded for all tables
** in the database. If additional tables are added to the database (by
** executing "CREATE TABLE" statements) after this call is made, changes for
** the new tables are also recorded.
**
** Changes can only be recorded for tables that have a PRIMARY KEY explicitly
** defined as part of their CREATE TABLE statement. It does not matter if the
** PRIMARY KEY is an "INTEGER PRIMARY KEY" (rowid alias) or not. The PRIMARY
** KEY may consist of a single column, or may be a composite key.
**
** It is not an error if the named table does not exist in the database. Nor
** is it an error if the named table does not have a PRIMARY KEY. However,
** no changes will be recorded in either of these scenarios.
**
** Changes are not recorded for individual rows that have NULL values stored
** in one or more of their PRIMARY KEY columns.
**
** SQLITE_OK is returned if the call completes without error. Or, if an error
** occurs, an SQLite error code (e.g. SQLITE_NOMEM) is returned.
**
** <h3>Special sqlite_stat1 Handling</h3>
**
** As of SQLite version 3.22.0, the "sqlite_stat1" table is an exception to
** some of the rules above. In SQLite, the schema of sqlite_stat1 is:
** <pre>
** CREATE TABLE sqlite_stat1(tbl,idx,stat)
** </pre>
**
** Even though sqlite_stat1 does not have a PRIMARY KEY, changes are
** recorded for it as if the PRIMARY KEY is (tbl,idx). Additionally, changes
** are recorded for rows for which (idx IS NULL) is true. However, for such
** rows a zero-length blob (SQL value X'') is stored in the changeset or
** patchset instead of a NULL value. This allows such changesets to be
** manipulated by legacy implementations of sqlite3changeset_invert(),
** concat() and similar.
**
** The sqlite3changeset_apply() function automatically converts the
** zero-length blob back to a NULL value when updating the sqlite_stat1
** table. However, if the application calls sqlite3changeset_new(),
** sqlite3changeset_old() or sqlite3changeset_conflict on a changeset
** iterator directly (including on a changeset iterator passed to a
** conflict-handler callback) then the X'' value is returned. The application
** must translate X'' to NULL itself if required.
**
** Legacy (older than 3.22.0) versions of the sessions module cannot capture
** changes made to the sqlite_stat1 table. Legacy versions of the
** sqlite3changeset_apply() function silently ignore any modifications to the
** sqlite_stat1 table that are part of a changeset or patchset.
*/
int sqlite3session_attach(
sqlite3_session *pSession, /* Session object */
const char *zTab /* Table name */
);
/*
** CAPI3REF: Set a table filter on a Session Object.
** METHOD: sqlite3_session
**
** The second argument (xFilter) is the "filter callback". For changes to rows
** in tables that are not attached to the Session object, the filter is called
** to determine whether changes to the table's rows should be tracked or not.
** If xFilter returns 0, changes are not tracked. Note that once a table is
** attached, xFilter will not be called again.
*/
void sqlite3session_table_filter(
sqlite3_session *pSession, /* Session object */
int(*xFilter)(
void *pCtx, /* Copy of third arg to _filter_table() */
const char *zTab /* Table name */
),
void *pCtx /* First argument passed to xFilter */
);
/*
** CAPI3REF: Generate A Changeset From A Session Object
** METHOD: sqlite3_session
**
** Obtain a changeset containing changes to the tables attached to the
** session object passed as the first argument. If successful,
** set *ppChangeset to point to a buffer containing the changeset
** and *pnChangeset to the size of the changeset in bytes before returning
** SQLITE_OK. If an error occurs, set both *ppChangeset and *pnChangeset to
** zero and return an SQLite error code.
**
** A changeset consists of zero or more INSERT, UPDATE and/or DELETE changes,
** each representing a change to a single row of an attached table. An INSERT
** change contains the values of each field of a new database row. A DELETE
** contains the original values of each field of a deleted database row. An
** UPDATE change contains the original values of each field of an updated
** database row along with the updated values for each updated non-primary-key
** column. It is not possible for an UPDATE change to represent a change that
** modifies the values of primary key columns. If such a change is made, it
** is represented in a changeset as a DELETE followed by an INSERT.
**
** Changes are not recorded for rows that have NULL values stored in one or
** more of their PRIMARY KEY columns. If such a row is inserted or deleted,
** no corresponding change is present in the changesets returned by this
** function. If an existing row with one or more NULL values stored in
** PRIMARY KEY columns is updated so that all PRIMARY KEY columns are non-NULL,
** only an INSERT is appears in the changeset. Similarly, if an existing row
** with non-NULL PRIMARY KEY values is updated so that one or more of its
** PRIMARY KEY columns are set to NULL, the resulting changeset contains a
** DELETE change only.
**
** The contents of a changeset may be traversed using an iterator created
** using the [sqlite3changeset_start()] API. A changeset may be applied to
** a database with a compatible schema using the [sqlite3changeset_apply()]
** API.
**
** Within a changeset generated by this function, all changes related to a
** single table are grouped together. In other words, when iterating through
** a changeset or when applying a changeset to a database, all changes related
** to a single table are processed before moving on to the next table. Tables
** are sorted in the same order in which they were attached (or auto-attached)
** to the sqlite3_session object. The order in which the changes related to
** a single table are stored is undefined.
**
** Following a successful call to this function, it is the responsibility of
** the caller to eventually free the buffer that *ppChangeset points to using
** [sqlite3_free()].
**
** <h3>Changeset Generation</h3>
**
** Once a table has been attached to a session object, the session object
** records the primary key values of all new rows inserted into the table.
** It also records the original primary key and other column values of any
** deleted or updated rows. For each unique primary key value, data is only
** recorded once - the first time a row with said primary key is inserted,
** updated or deleted in the lifetime of the session.
**
** There is one exception to the previous paragraph: when a row is inserted,
** updated or deleted, if one or more of its primary key columns contain a
** NULL value, no record of the change is made.
**
** The session object therefore accumulates two types of records - those
** that consist of primary key values only (created when the user inserts
** a new record) and those that consist of the primary key values and the
** original values of other table columns (created when the users deletes
** or updates a record).
**
** When this function is called, the requested changeset is created using
** both the accumulated records and the current contents of the database
** file. Specifically:
**
** <ul>
** <li> For each record generated by an insert, the database is queried
** for a row with a matching primary key. If one is found, an INSERT
** change is added to the changeset. If no such row is found, no change
** is added to the changeset.
**
** <li> For each record generated by an update or delete, the database is
** queried for a row with a matching primary key. If such a row is
** found and one or more of the non-primary key fields have been
** modified from their original values, an UPDATE change is added to
** the changeset. Or, if no such row is found in the table, a DELETE
** change is added to the changeset. If there is a row with a matching
** primary key in the database, but all fields contain their original
** values, no change is added to the changeset.
** </ul>
**
** This means, amongst other things, that if a row is inserted and then later
** deleted while a session object is active, neither the insert nor the delete
** will be present in the changeset. Or if a row is deleted and then later a
** row with the same primary key values inserted while a session object is
** active, the resulting changeset will contain an UPDATE change instead of
** a DELETE and an INSERT.
**
** When a session object is disabled (see the [sqlite3session_enable()] API),
** it does not accumulate records when rows are inserted, updated or deleted.
** This may appear to have some counter-intuitive effects if a single row
** is written to more than once during a session. For example, if a row
** is inserted while a session object is enabled, then later deleted while
** the same session object is disabled, no INSERT record will appear in the
** changeset, even though the delete took place while the session was disabled.
** Or, if one field of a row is updated while a session is disabled, and
** another field of the same row is updated while the session is enabled, the
** resulting changeset will contain an UPDATE change that updates both fields.
*/
int sqlite3session_changeset(
sqlite3_session *pSession, /* Session object */
int *pnChangeset, /* OUT: Size of buffer at *ppChangeset */
void **ppChangeset /* OUT: Buffer containing changeset */
);
/*
** CAPI3REF: Return An Upper-limit For The Size Of The Changeset
** METHOD: sqlite3_session
**
** By default, this function always returns 0. For it to return
** a useful result, the sqlite3_session object must have been configured
** to enable this API using sqlite3session_object_config() with the
** SQLITE_SESSION_OBJCONFIG_SIZE verb.
**
** When enabled, this function returns an upper limit, in bytes, for the size
** of the changeset that might be produced if sqlite3session_changeset() were
** called. The final changeset size might be equal to or smaller than the
** size in bytes returned by this function.
*/
sqlite3_int64 sqlite3session_changeset_size(sqlite3_session *pSession);
/*
** CAPI3REF: Load The Difference Between Tables Into A Session
** METHOD: sqlite3_session
**
** If it is not already attached to the session object passed as the first
** argument, this function attaches table zTbl in the same manner as the
** [sqlite3session_attach()] function. If zTbl does not exist, or if it
** does not have a primary key, this function is a no-op (but does not return
** an error).
**
** Argument zFromDb must be the name of a database ("main", "temp" etc.)
** attached to the same database handle as the session object that contains
** a table compatible with the table attached to the session by this function.
** A table is considered compatible if it:
**
** <ul>
** <li> Has the same name,
** <li> Has the same set of columns declared in the same order, and
** <li> Has the same PRIMARY KEY definition.
** </ul>
**
** If the tables are not compatible, SQLITE_SCHEMA is returned. If the tables
** are compatible but do not have any PRIMARY KEY columns, it is not an error
** but no changes are added to the session object. As with other session
** APIs, tables without PRIMARY KEYs are simply ignored.
**
** This function adds a set of changes to the session object that could be
** used to update the table in database zFrom (call this the "from-table")
** so that its content is the same as the table attached to the session
** object (call this the "to-table"). Specifically:
**
** <ul>
** <li> For each row (primary key) that exists in the to-table but not in
** the from-table, an INSERT record is added to the session object.
**
** <li> For each row (primary key) that exists in the to-table but not in
** the from-table, a DELETE record is added to the session object.
**
** <li> For each row (primary key) that exists in both tables, but features
** different non-PK values in each, an UPDATE record is added to the
** session.
** </ul>
**
** To clarify, if this function is called and then a changeset constructed
** using [sqlite3session_changeset()], then after applying that changeset to
** database zFrom the contents of the two compatible tables would be
** identical.
**
** It an error if database zFrom does not exist or does not contain the
** required compatible table.
**
** If the operation is successful, SQLITE_OK is returned. Otherwise, an SQLite
** error code. In this case, if argument pzErrMsg is not NULL, *pzErrMsg
** may be set to point to a buffer containing an English language error
** message. It is the responsibility of the caller to free this buffer using
** sqlite3_free().
*/
int sqlite3session_diff(
sqlite3_session *pSession,
const char *zFromDb,
const char *zTbl,
char **pzErrMsg
);
/*
** CAPI3REF: Generate A Patchset From A Session Object
** METHOD: sqlite3_session
**
** The differences between a patchset and a changeset are that:
**
** <ul>
** <li> DELETE records consist of the primary key fields only. The
** original values of other fields are omitted.
** <li> The original values of any modified fields are omitted from
** UPDATE records.
** </ul>
**
** A patchset blob may be used with up to date versions of all
** sqlite3changeset_xxx API functions except for sqlite3changeset_invert(),
** which returns SQLITE_CORRUPT if it is passed a patchset. Similarly,
** attempting to use a patchset blob with old versions of the
** sqlite3changeset_xxx APIs also provokes an SQLITE_CORRUPT error.
**
** Because the non-primary key "old.*" fields are omitted, no
** SQLITE_CHANGESET_DATA conflicts can be detected or reported if a patchset
** is passed to the sqlite3changeset_apply() API. Other conflict types work
** in the same way as for changesets.
**
** Changes within a patchset are ordered in the same way as for changesets
** generated by the sqlite3session_changeset() function (i.e. all changes for
** a single table are grouped together, tables appear in the order in which
** they were attached to the session object).
*/
int sqlite3session_patchset(
sqlite3_session *pSession, /* Session object */
int *pnPatchset, /* OUT: Size of buffer at *ppPatchset */
void **ppPatchset /* OUT: Buffer containing patchset */
);
/*
** CAPI3REF: Test if a changeset has recorded any changes.
**
** Return non-zero if no changes to attached tables have been recorded by
** the session object passed as the first argument. Otherwise, if one or
** more changes have been recorded, return zero.
**
** Even if this function returns zero, it is possible that calling
** [sqlite3session_changeset()] on the session handle may still return a
** changeset that contains no changes. This can happen when a row in
** an attached table is modified and then later on the original values
** are restored. However, if this function returns non-zero, then it is
** guaranteed that a call to sqlite3session_changeset() will return a
** changeset containing zero changes.
*/
int sqlite3session_isempty(sqlite3_session *pSession);
/*
** CAPI3REF: Query for the amount of heap memory used by a session object.
**
** This API returns the total amount of heap memory in bytes currently
** used by the session object passed as the only argument.
*/
sqlite3_int64 sqlite3session_memory_used(sqlite3_session *pSession);
/*
** CAPI3REF: Create An Iterator To Traverse A Changeset
** CONSTRUCTOR: sqlite3_changeset_iter
**
** Create an iterator used to iterate through the contents of a changeset.
** If successful, *pp is set to point to the iterator handle and SQLITE_OK
** is returned. Otherwise, if an error occurs, *pp is set to zero and an
** SQLite error code is returned.
**
** The following functions can be used to advance and query a changeset
** iterator created by this function:
**
** <ul>
** <li> [sqlite3changeset_next()]
** <li> [sqlite3changeset_op()]
** <li> [sqlite3changeset_new()]
** <li> [sqlite3changeset_old()]
** </ul>
**
** It is the responsibility of the caller to eventually destroy the iterator
** by passing it to [sqlite3changeset_finalize()]. The buffer containing the
** changeset (pChangeset) must remain valid until after the iterator is
** destroyed.
**
** Assuming the changeset blob was created by one of the
** [sqlite3session_changeset()], [sqlite3changeset_concat()] or
** [sqlite3changeset_invert()] functions, all changes within the changeset
** that apply to a single table are grouped together. This means that when
** an application iterates through a changeset using an iterator created by
** this function, all changes that relate to a single table are visited
** consecutively. There is no chance that the iterator will visit a change
** the applies to table X, then one for table Y, and then later on visit
** another change for table X.
**
** The behavior of sqlite3changeset_start_v2() and its streaming equivalent
** may be modified by passing a combination of
** [SQLITE_CHANGESETSTART_INVERT | supported flags] as the 4th parameter.
**
** Note that the sqlite3changeset_start_v2() API is still <b>experimental</b>
** and therefore subject to change.
*/
int sqlite3changeset_start(
sqlite3_changeset_iter **pp, /* OUT: New changeset iterator handle */
int nChangeset, /* Size of changeset blob in bytes */
void *pChangeset /* Pointer to blob containing changeset */
);
int sqlite3changeset_start_v2(
sqlite3_changeset_iter **pp, /* OUT: New changeset iterator handle */
int nChangeset, /* Size of changeset blob in bytes */
void *pChangeset, /* Pointer to blob containing changeset */
int flags /* SESSION_CHANGESETSTART_* flags */
);
/*
** CAPI3REF: Flags for sqlite3changeset_start_v2
**
** The following flags may passed via the 4th parameter to
** [sqlite3changeset_start_v2] and [sqlite3changeset_start_v2_strm]:
**
** <dt>SQLITE_CHANGESETAPPLY_INVERT <dd>
** Invert the changeset while iterating through it. This is equivalent to
** inverting a changeset using sqlite3changeset_invert() before applying it.
** It is an error to specify this flag with a patchset.
*/
#define SQLITE_CHANGESETSTART_INVERT 0x0002
/*
** CAPI3REF: Advance A Changeset Iterator
** METHOD: sqlite3_changeset_iter
**
** This function may only be used with iterators created by the function
** [sqlite3changeset_start()]. If it is called on an iterator passed to
** a conflict-handler callback by [sqlite3changeset_apply()], SQLITE_MISUSE
** is returned and the call has no effect.
**
** Immediately after an iterator is created by sqlite3changeset_start(), it
** does not point to any change in the changeset. Assuming the changeset
** is not empty, the first call to this function advances the iterator to
** point to the first change in the changeset. Each subsequent call advances
** the iterator to point to the next change in the changeset (if any). If
** no error occurs and the iterator points to a valid change after a call
** to sqlite3changeset_next() has advanced it, SQLITE_ROW is returned.
** Otherwise, if all changes in the changeset have already been visited,
** SQLITE_DONE is returned.
**
** If an error occurs, an SQLite error code is returned. Possible error
** codes include SQLITE_CORRUPT (if the changeset buffer is corrupt) or
** SQLITE_NOMEM.
*/
int sqlite3changeset_next(sqlite3_changeset_iter *pIter);
/*
** CAPI3REF: Obtain The Current Operation From A Changeset Iterator
** METHOD: sqlite3_changeset_iter
**
** The pIter argument passed to this function may either be an iterator
** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
** created by [sqlite3changeset_start()]. In the latter case, the most recent
** call to [sqlite3changeset_next()] must have returned [SQLITE_ROW]. If this
** is not the case, this function returns [SQLITE_MISUSE].
**
** Arguments pOp, pnCol and pzTab may not be NULL. Upon return, three
** outputs are set through these pointers:
**
** *pOp is set to one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE],
** depending on the type of change that the iterator currently points to;
**
** *pnCol is set to the number of columns in the table affected by the change; and
**
** *pzTab is set to point to a nul-terminated utf-8 encoded string containing
** the name of the table affected by the current change. The buffer remains
** valid until either sqlite3changeset_next() is called on the iterator
** or until the conflict-handler function returns.
**
** If pbIndirect is not NULL, then *pbIndirect is set to true (1) if the change
** is an indirect change, or false (0) otherwise. See the documentation for
** [sqlite3session_indirect()] for a description of direct and indirect
** changes.
**
** If no error occurs, SQLITE_OK is returned. If an error does occur, an
** SQLite error code is returned. The values of the output variables may not
** be trusted in this case.
*/
int sqlite3changeset_op(
sqlite3_changeset_iter *pIter, /* Iterator object */
const char **pzTab, /* OUT: Pointer to table name */
int *pnCol, /* OUT: Number of columns in table */
int *pOp, /* OUT: SQLITE_INSERT, DELETE or UPDATE */
int *pbIndirect /* OUT: True for an 'indirect' change */
);
/*
** CAPI3REF: Obtain The Primary Key Definition Of A Table
** METHOD: sqlite3_changeset_iter
**
** For each modified table, a changeset includes the following:
**
** <ul>
** <li> The number of columns in the table, and
** <li> Which of those columns make up the tables PRIMARY KEY.
** </ul>
**
** This function is used to find which columns comprise the PRIMARY KEY of
** the table modified by the change that iterator pIter currently points to.
** If successful, *pabPK is set to point to an array of nCol entries, where
** nCol is the number of columns in the table. Elements of *pabPK are set to
** 0x01 if the corresponding column is part of the tables primary key, or
** 0x00 if it is not.
**
** If argument pnCol is not NULL, then *pnCol is set to the number of columns
** in the table.
**
** If this function is called when the iterator does not point to a valid
** entry, SQLITE_MISUSE is returned and the output variables zeroed. Otherwise,
** SQLITE_OK is returned and the output variables populated as described
** above.
*/
int sqlite3changeset_pk(
sqlite3_changeset_iter *pIter, /* Iterator object */
unsigned char **pabPK, /* OUT: Array of boolean - true for PK cols */
int *pnCol /* OUT: Number of entries in output array */
);
/*
** CAPI3REF: Obtain old.* Values From A Changeset Iterator
** METHOD: sqlite3_changeset_iter
**
** The pIter argument passed to this function may either be an iterator
** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
** created by [sqlite3changeset_start()]. In the latter case, the most recent
** call to [sqlite3changeset_next()] must have returned SQLITE_ROW.
** Furthermore, it may only be called if the type of change that the iterator
** currently points to is either [SQLITE_DELETE] or [SQLITE_UPDATE]. Otherwise,
** this function returns [SQLITE_MISUSE] and sets *ppValue to NULL.
**
** Argument iVal must be greater than or equal to 0, and less than the number
** of columns in the table affected by the current change. Otherwise,
** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
**
** If successful, this function sets *ppValue to point to a protected
** sqlite3_value object containing the iVal'th value from the vector of
** original row values stored as part of the UPDATE or DELETE change and
** returns SQLITE_OK. The name of the function comes from the fact that this
** is similar to the "old.*" columns available to update or delete triggers.
**
** If some other error occurs (e.g. an OOM condition), an SQLite error code
** is returned and *ppValue is set to NULL.
*/
int sqlite3changeset_old(
sqlite3_changeset_iter *pIter, /* Changeset iterator */
int iVal, /* Column number */
sqlite3_value **ppValue /* OUT: Old value (or NULL pointer) */
);
/*
** CAPI3REF: Obtain new.* Values From A Changeset Iterator
** METHOD: sqlite3_changeset_iter
**
** The pIter argument passed to this function may either be an iterator
** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
** created by [sqlite3changeset_start()]. In the latter case, the most recent
** call to [sqlite3changeset_next()] must have returned SQLITE_ROW.
** Furthermore, it may only be called if the type of change that the iterator
** currently points to is either [SQLITE_UPDATE] or [SQLITE_INSERT]. Otherwise,
** this function returns [SQLITE_MISUSE] and sets *ppValue to NULL.
**
** Argument iVal must be greater than or equal to 0, and less than the number
** of columns in the table affected by the current change. Otherwise,
** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
**
** If successful, this function sets *ppValue to point to a protected
** sqlite3_value object containing the iVal'th value from the vector of
** new row values stored as part of the UPDATE or INSERT change and
** returns SQLITE_OK. If the change is an UPDATE and does not include
** a new value for the requested column, *ppValue is set to NULL and
** SQLITE_OK returned. The name of the function comes from the fact that
** this is similar to the "new.*" columns available to update or delete
** triggers.
**
** If some other error occurs (e.g. an OOM condition), an SQLite error code
** is returned and *ppValue is set to NULL.
*/
int sqlite3changeset_new(
sqlite3_changeset_iter *pIter, /* Changeset iterator */
int iVal, /* Column number */
sqlite3_value **ppValue /* OUT: New value (or NULL pointer) */
);
/*
** CAPI3REF: Obtain Conflicting Row Values From A Changeset Iterator
** METHOD: sqlite3_changeset_iter
**
** This function should only be used with iterator objects passed to a
** conflict-handler callback by [sqlite3changeset_apply()] with either
** [SQLITE_CHANGESET_DATA] or [SQLITE_CHANGESET_CONFLICT]. If this function
** is called on any other iterator, [SQLITE_MISUSE] is returned and *ppValue
** is set to NULL.
**
** Argument iVal must be greater than or equal to 0, and less than the number
** of columns in the table affected by the current change. Otherwise,
** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
**
** If successful, this function sets *ppValue to point to a protected
** sqlite3_value object containing the iVal'th value from the
** "conflicting row" associated with the current conflict-handler callback
** and returns SQLITE_OK.
**
** If some other error occurs (e.g. an OOM condition), an SQLite error code
** is returned and *ppValue is set to NULL.
*/
int sqlite3changeset_conflict(
sqlite3_changeset_iter *pIter, /* Changeset iterator */
int iVal, /* Column number */
sqlite3_value **ppValue /* OUT: Value from conflicting row */
);
/*
** CAPI3REF: Determine The Number Of Foreign Key Constraint Violations
** METHOD: sqlite3_changeset_iter
**
** This function may only be called with an iterator passed to an
** SQLITE_CHANGESET_FOREIGN_KEY conflict handler callback. In this case
** it sets the output variable to the total number of known foreign key
** violations in the destination database and returns SQLITE_OK.
**
** In all other cases this function returns SQLITE_MISUSE.
*/
int sqlite3changeset_fk_conflicts(
sqlite3_changeset_iter *pIter, /* Changeset iterator */
int *pnOut /* OUT: Number of FK violations */
);
/*
** CAPI3REF: Finalize A Changeset Iterator
** METHOD: sqlite3_changeset_iter
**
** This function is used to finalize an iterator allocated with
** [sqlite3changeset_start()].
**
** This function should only be called on iterators created using the
** [sqlite3changeset_start()] function. If an application calls this
** function with an iterator passed to a conflict-handler by
** [sqlite3changeset_apply()], [SQLITE_MISUSE] is immediately returned and the
** call has no effect.
**
** If an error was encountered within a call to an sqlite3changeset_xxx()
** function (for example an [SQLITE_CORRUPT] in [sqlite3changeset_next()] or an
** [SQLITE_NOMEM] in [sqlite3changeset_new()]) then an error code corresponding
** to that error is returned by this function. Otherwise, SQLITE_OK is
** returned. This is to allow the following pattern (pseudo-code):
**
** <pre>
** sqlite3changeset_start();
** while( SQLITE_ROW==sqlite3changeset_next() ){
** // Do something with change.
** }
** rc = sqlite3changeset_finalize();
** if( rc!=SQLITE_OK ){
** // An error has occurred
** }
** </pre>
*/
int sqlite3changeset_finalize(sqlite3_changeset_iter *pIter);
/*
** CAPI3REF: Invert A Changeset
**
** This function is used to "invert" a changeset object. Applying an inverted
** changeset to a database reverses the effects of applying the uninverted
** changeset. Specifically:
**
** <ul>
** <li> Each DELETE change is changed to an INSERT, and
** <li> Each INSERT change is changed to a DELETE, and
** <li> For each UPDATE change, the old.* and new.* values are exchanged.
** </ul>
**
** This function does not change the order in which changes appear within
** the changeset. It merely reverses the sense of each individual change.
**
** If successful, a pointer to a buffer containing the inverted changeset
** is stored in *ppOut, the size of the same buffer is stored in *pnOut, and
** SQLITE_OK is returned. If an error occurs, both *pnOut and *ppOut are
** zeroed and an SQLite error code returned.
**
** It is the responsibility of the caller to eventually call sqlite3_free()
** on the *ppOut pointer to free the buffer allocation following a successful
** call to this function.
**
** WARNING/TODO: This function currently assumes that the input is a valid
** changeset. If it is not, the results are undefined.
*/
int sqlite3changeset_invert(
int nIn, const void *pIn, /* Input changeset */
int *pnOut, void **ppOut /* OUT: Inverse of input */
);
/*
** CAPI3REF: Concatenate Two Changeset Objects
**
** This function is used to concatenate two changesets, A and B, into a
** single changeset. The result is a changeset equivalent to applying
** changeset A followed by changeset B.
**
** This function combines the two input changesets using an
** sqlite3_changegroup object. Calling it produces similar results as the
** following code fragment:
**
** <pre>
** sqlite3_changegroup *pGrp;
** rc = sqlite3_changegroup_new(&pGrp);
** if( rc==SQLITE_OK ) rc = sqlite3changegroup_add(pGrp, nA, pA);
** if( rc==SQLITE_OK ) rc = sqlite3changegroup_add(pGrp, nB, pB);
** if( rc==SQLITE_OK ){
** rc = sqlite3changegroup_output(pGrp, pnOut, ppOut);
** }else{
** *ppOut = 0;
** *pnOut = 0;
** }
** </pre>
**
** Refer to the sqlite3_changegroup documentation below for details.
*/
int sqlite3changeset_concat(
int nA, /* Number of bytes in buffer pA */
void *pA, /* Pointer to buffer containing changeset A */
int nB, /* Number of bytes in buffer pB */
void *pB, /* Pointer to buffer containing changeset B */
int *pnOut, /* OUT: Number of bytes in output changeset */
void **ppOut /* OUT: Buffer containing output changeset */
);
/*
** CAPI3REF: Changegroup Handle
**
** A changegroup is an object used to combine two or more
** [changesets] or [patchsets]
*/
typedef struct sqlite3_changegroup sqlite3_changegroup;
/*
** CAPI3REF: Create A New Changegroup Object
** CONSTRUCTOR: sqlite3_changegroup
**
** An sqlite3_changegroup object is used to combine two or more changesets
** (or patchsets) into a single changeset (or patchset). A single changegroup
** object may combine changesets or patchsets, but not both. The output is
** always in the same format as the input.
**
** If successful, this function returns SQLITE_OK and populates (*pp) with
** a pointer to a new sqlite3_changegroup object before returning. The caller
** should eventually free the returned object using a call to
** sqlite3changegroup_delete(). If an error occurs, an SQLite error code
** (i.e. SQLITE_NOMEM) is returned and *pp is set to NULL.
**
** The usual usage pattern for an sqlite3_changegroup object is as follows:
**
** <ul>
** <li> It is created using a call to sqlite3changegroup_new().
**
** <li> Zero or more changesets (or patchsets) are added to the object
** by calling sqlite3changegroup_add().
**
** <li> The result of combining all input changesets together is obtained
** by the application via a call to sqlite3changegroup_output().
**
** <li> The object is deleted using a call to sqlite3changegroup_delete().
** </ul>
**
** Any number of calls to add() and output() may be made between the calls to
** new() and delete(), and in any order.
**
** As well as the regular sqlite3changegroup_add() and
** sqlite3changegroup_output() functions, also available are the streaming
** versions sqlite3changegroup_add_strm() and sqlite3changegroup_output_strm().
*/
int sqlite3changegroup_new(sqlite3_changegroup **pp);
/*
** CAPI3REF: Add A Changeset To A Changegroup
** METHOD: sqlite3_changegroup
**
** Add all changes within the changeset (or patchset) in buffer pData (size
** nData bytes) to the changegroup.
**
** If the buffer contains a patchset, then all prior calls to this function
** on the same changegroup object must also have specified patchsets. Or, if
** the buffer contains a changeset, so must have the earlier calls to this
** function. Otherwise, SQLITE_ERROR is returned and no changes are added
** to the changegroup.
**
** Rows within the changeset and changegroup are identified by the values in
** their PRIMARY KEY columns. A change in the changeset is considered to
** apply to the same row as a change already present in the changegroup if
** the two rows have the same primary key.
**
** Changes to rows that do not already appear in the changegroup are
** simply copied into it. Or, if both the new changeset and the changegroup
** contain changes that apply to a single row, the final contents of the
** changegroup depends on the type of each change, as follows:
**
** <table border=1 style="margin-left:8ex;margin-right:8ex">
** <tr><th style="white-space:pre">Existing Change </th>
** <th style="white-space:pre">New Change </th>
** <th>Output Change
** <tr><td>INSERT <td>INSERT <td>
** The new change is ignored. This case does not occur if the new
** changeset was recorded immediately after the changesets already
** added to the changegroup.
** <tr><td>INSERT <td>UPDATE <td>
** The INSERT change remains in the changegroup. The values in the
** INSERT change are modified as if the row was inserted by the
** existing change and then updated according to the new change.
** <tr><td>INSERT <td>DELETE <td>
** The existing INSERT is removed from the changegroup. The DELETE is
** not added.
** <tr><td>UPDATE <td>INSERT <td>
** The new change is ignored. This case does not occur if the new
** changeset was recorded immediately after the changesets already
** added to the changegroup.
** <tr><td>UPDATE <td>UPDATE <td>
** The existing UPDATE remains within the changegroup. It is amended
** so that the accompanying values are as if the row was updated once
** by the existing change and then again by the new change.
** <tr><td>UPDATE <td>DELETE <td>
** The existing UPDATE is replaced by the new DELETE within the
** changegroup.
** <tr><td>DELETE <td>INSERT <td>
** If one or more of the column values in the row inserted by the
** new change differ from those in the row deleted by the existing
** change, the existing DELETE is replaced by an UPDATE within the
** changegroup. Otherwise, if the inserted row is exactly the same
** as the deleted row, the existing DELETE is simply discarded.
** <tr><td>DELETE <td>UPDATE <td>
** The new change is ignored. This case does not occur if the new
** changeset was recorded immediately after the changesets already
** added to the changegroup.
** <tr><td>DELETE <td>DELETE <td>
** The new change is ignored. This case does not occur if the new
** changeset was recorded immediately after the changesets already
** added to the changegroup.
** </table>
**
** If the new changeset contains changes to a table that is already present
** in the changegroup, then the number of columns and the position of the
** primary key columns for the table must be consistent. If this is not the
** case, this function fails with SQLITE_SCHEMA. If the input changeset
** appears to be corrupt and the corruption is detected, SQLITE_CORRUPT is
** returned. Or, if an out-of-memory condition occurs during processing, this
** function returns SQLITE_NOMEM. In all cases, if an error occurs the state
** of the final contents of the changegroup is undefined.
**
** If no error occurs, SQLITE_OK is returned.
*/
int sqlite3changegroup_add(sqlite3_changegroup*, int nData, void *pData);
/*
** CAPI3REF: Obtain A Composite Changeset From A Changegroup
** METHOD: sqlite3_changegroup
**
** Obtain a buffer containing a changeset (or patchset) representing the
** current contents of the changegroup. If the inputs to the changegroup
** were themselves changesets, the output is a changeset. Or, if the
** inputs were patchsets, the output is also a patchset.
**
** As with the output of the sqlite3session_changeset() and
** sqlite3session_patchset() functions, all changes related to a single
** table are grouped together in the output of this function. Tables appear
** in the same order as for the very first changeset added to the changegroup.
** If the second or subsequent changesets added to the changegroup contain
** changes for tables that do not appear in the first changeset, they are
** appended onto the end of the output changeset, again in the order in
** which they are first encountered.
**
** If an error occurs, an SQLite error code is returned and the output
** variables (*pnData) and (*ppData) are set to 0. Otherwise, SQLITE_OK
** is returned and the output variables are set to the size of and a
** pointer to the output buffer, respectively. In this case it is the
** responsibility of the caller to eventually free the buffer using a
** call to sqlite3_free().
*/
int sqlite3changegroup_output(
sqlite3_changegroup*,
int *pnData, /* OUT: Size of output buffer in bytes */
void **ppData /* OUT: Pointer to output buffer */
);
/*
** CAPI3REF: Delete A Changegroup Object
** DESTRUCTOR: sqlite3_changegroup
*/
void sqlite3changegroup_delete(sqlite3_changegroup*);
/*
** CAPI3REF: Apply A Changeset To A Database
**
** Apply a changeset or patchset to a database. These functions attempt to
** update the "main" database attached to handle db with the changes found in
** the changeset passed via the second and third arguments.
**
** The fourth argument (xFilter) passed to these functions is the "filter
** callback". If it is not NULL, then for each table affected by at least one
** change in the changeset, the filter callback is invoked with
** the table name as the second argument, and a copy of the context pointer
** passed as the sixth argument as the first. If the "filter callback"
** returns zero, then no attempt is made to apply any changes to the table.
** Otherwise, if the return value is non-zero or the xFilter argument to
** is NULL, all changes related to the table are attempted.
**
** For each table that is not excluded by the filter callback, this function
** tests that the target database contains a compatible table. A table is
** considered compatible if all of the following are true:
**
** <ul>
** <li> The table has the same name as the name recorded in the
** changeset, and
** <li> The table has at least as many columns as recorded in the
** changeset, and
** <li> The table has primary key columns in the same position as
** recorded in the changeset.
** </ul>
**
** If there is no compatible table, it is not an error, but none of the
** changes associated with the table are applied. A warning message is issued
** via the sqlite3_log() mechanism with the error code SQLITE_SCHEMA. At most
** one such warning is issued for each table in the changeset.
**
** For each change for which there is a compatible table, an attempt is made
** to modify the table contents according to the UPDATE, INSERT or DELETE
** change. If a change cannot be applied cleanly, the conflict handler
** function passed as the fifth argument to sqlite3changeset_apply() may be
** invoked. A description of exactly when the conflict handler is invoked for
** each type of change is below.
**
** Unlike the xFilter argument, xConflict may not be passed NULL. The results
** of passing anything other than a valid function pointer as the xConflict
** argument are undefined.
**
** Each time the conflict handler function is invoked, it must return one
** of [SQLITE_CHANGESET_OMIT], [SQLITE_CHANGESET_ABORT] or
** [SQLITE_CHANGESET_REPLACE]. SQLITE_CHANGESET_REPLACE may only be returned
** if the second argument passed to the conflict handler is either
** SQLITE_CHANGESET_DATA or SQLITE_CHANGESET_CONFLICT. If the conflict-handler
** returns an illegal value, any changes already made are rolled back and
** the call to sqlite3changeset_apply() returns SQLITE_MISUSE. Different
** actions are taken by sqlite3changeset_apply() depending on the value
** returned by each invocation of the conflict-handler function. Refer to
** the documentation for the three
** [SQLITE_CHANGESET_OMIT|available return values] for details.
**
** <dl>
** <dt>DELETE Changes<dd>
** For each DELETE change, the function checks if the target database
** contains a row with the same primary key value (or values) as the
** original row values stored in the changeset. If it does, and the values
** stored in all non-primary key columns also match the values stored in
** the changeset the row is deleted from the target database.
**
** If a row with matching primary key values is found, but one or more of
** the non-primary key fields contains a value different from the original
** row value stored in the changeset, the conflict-handler function is
** invoked with [SQLITE_CHANGESET_DATA] as the second argument. If the
** database table has more columns than are recorded in the changeset,
** only the values of those non-primary key fields are compared against
** the current database contents - any trailing database table columns
** are ignored.
**
** If no row with matching primary key values is found in the database,
** the conflict-handler function is invoked with [SQLITE_CHANGESET_NOTFOUND]
** passed as the second argument.
**
** If the DELETE operation is attempted, but SQLite returns SQLITE_CONSTRAINT
** (which can only happen if a foreign key constraint is violated), the
** conflict-handler function is invoked with [SQLITE_CHANGESET_CONSTRAINT]
** passed as the second argument. This includes the case where the DELETE
** operation is attempted because an earlier call to the conflict handler
** function returned [SQLITE_CHANGESET_REPLACE].
**
** <dt>INSERT Changes<dd>
** For each INSERT change, an attempt is made to insert the new row into
** the database. If the changeset row contains fewer fields than the
** database table, the trailing fields are populated with their default
** values.
**
** If the attempt to insert the row fails because the database already
** contains a row with the same primary key values, the conflict handler
** function is invoked with the second argument set to
** [SQLITE_CHANGESET_CONFLICT].
**
** If the attempt to insert the row fails because of some other constraint
** violation (e.g. NOT NULL or UNIQUE), the conflict handler function is
** invoked with the second argument set to [SQLITE_CHANGESET_CONSTRAINT].
** This includes the case where the INSERT operation is re-attempted because
** an earlier call to the conflict handler function returned
** [SQLITE_CHANGESET_REPLACE].
**
** <dt>UPDATE Changes<dd>
** For each UPDATE change, the function checks if the target database
** contains a row with the same primary key value (or values) as the
** original row values stored in the changeset. If it does, and the values
** stored in all modified non-primary key columns also match the values
** stored in the changeset the row is updated within the target database.
**
** If a row with matching primary key values is found, but one or more of
** the modified non-primary key fields contains a value different from an
** original row value stored in the changeset, the conflict-handler function
** is invoked with [SQLITE_CHANGESET_DATA] as the second argument. Since
** UPDATE changes only contain values for non-primary key fields that are
** to be modified, only those fields need to match the original values to
** avoid the SQLITE_CHANGESET_DATA conflict-handler callback.
**
** If no row with matching primary key values is found in the database,
** the conflict-handler function is invoked with [SQLITE_CHANGESET_NOTFOUND]
** passed as the second argument.
**
** If the UPDATE operation is attempted, but SQLite returns
** SQLITE_CONSTRAINT, the conflict-handler function is invoked with
** [SQLITE_CHANGESET_CONSTRAINT] passed as the second argument.
** This includes the case where the UPDATE operation is attempted after
** an earlier call to the conflict handler function returned
** [SQLITE_CHANGESET_REPLACE].
** </dl>
**
** It is safe to execute SQL statements, including those that write to the
** table that the callback related to, from within the xConflict callback.
** This can be used to further customize the application's conflict
** resolution strategy.
**
** All changes made by these functions are enclosed in a savepoint transaction.
** If any other error (aside from a constraint failure when attempting to
** write to the target database) occurs, then the savepoint transaction is
** rolled back, restoring the target database to its original state, and an
** SQLite error code returned.
**
** If the output parameters (ppRebase) and (pnRebase) are non-NULL and
** the input is a changeset (not a patchset), then sqlite3changeset_apply_v2()
** may set (*ppRebase) to point to a "rebase" that may be used with the
** sqlite3_rebaser APIs buffer before returning. In this case (*pnRebase)
** is set to the size of the buffer in bytes. It is the responsibility of the
** caller to eventually free any such buffer using sqlite3_free(). The buffer
** is only allocated and populated if one or more conflicts were encountered
** while applying the patchset. See comments surrounding the sqlite3_rebaser
** APIs for further details.
**
** The behavior of sqlite3changeset_apply_v2() and its streaming equivalent
** may be modified by passing a combination of
** [SQLITE_CHANGESETAPPLY_NOSAVEPOINT | supported flags] as the 9th parameter.
**
** Note that the sqlite3changeset_apply_v2() API is still <b>experimental</b>
** and therefore subject to change.
*/
int sqlite3changeset_apply(
sqlite3 *db, /* Apply change to "main" db of this handle */
int nChangeset, /* Size of changeset in bytes */
void *pChangeset, /* Changeset blob */
int(*xFilter)(
void *pCtx, /* Copy of sixth arg to _apply() */
const char *zTab /* Table name */
),
int(*xConflict)(
void *pCtx, /* Copy of sixth arg to _apply() */
int eConflict, /* DATA, MISSING, CONFLICT, CONSTRAINT */
sqlite3_changeset_iter *p /* Handle describing change and conflict */
),
void *pCtx /* First argument passed to xConflict */
);
int sqlite3changeset_apply_v2(
sqlite3 *db, /* Apply change to "main" db of this handle */
int nChangeset, /* Size of changeset in bytes */
void *pChangeset, /* Changeset blob */
int(*xFilter)(
void *pCtx, /* Copy of sixth arg to _apply() */
const char *zTab /* Table name */
),
int(*xConflict)(
void *pCtx, /* Copy of sixth arg to _apply() */
int eConflict, /* DATA, MISSING, CONFLICT, CONSTRAINT */
sqlite3_changeset_iter *p /* Handle describing change and conflict */
),
void *pCtx, /* First argument passed to xConflict */
void **ppRebase, int *pnRebase, /* OUT: Rebase data */
int flags /* SESSION_CHANGESETAPPLY_* flags */
);
/*
** CAPI3REF: Flags for sqlite3changeset_apply_v2
**
** The following flags may passed via the 9th parameter to
** [sqlite3changeset_apply_v2] and [sqlite3changeset_apply_v2_strm]:
**
** <dl>
** <dt>SQLITE_CHANGESETAPPLY_NOSAVEPOINT <dd>
** Usually, the sessions module encloses all operations performed by
** a single call to apply_v2() or apply_v2_strm() in a [SAVEPOINT]. The
** SAVEPOINT is committed if the changeset or patchset is successfully
** applied, or rolled back if an error occurs. Specifying this flag
** causes the sessions module to omit this savepoint. In this case, if the
** caller has an open transaction or savepoint when apply_v2() is called,
** it may revert the partially applied changeset by rolling it back.
**
** <dt>SQLITE_CHANGESETAPPLY_INVERT <dd>
** Invert the changeset before applying it. This is equivalent to inverting
** a changeset using sqlite3changeset_invert() before applying it. It is
** an error to specify this flag with a patchset.
*/
#define SQLITE_CHANGESETAPPLY_NOSAVEPOINT 0x0001
#define SQLITE_CHANGESETAPPLY_INVERT 0x0002
/*
** CAPI3REF: Constants Passed To The Conflict Handler
**
** Values that may be passed as the second argument to a conflict-handler.
**
** <dl>
** <dt>SQLITE_CHANGESET_DATA<dd>
** The conflict handler is invoked with CHANGESET_DATA as the second argument
** when processing a DELETE or UPDATE change if a row with the required
** PRIMARY KEY fields is present in the database, but one or more other
** (non primary-key) fields modified by the update do not contain the
** expected "before" values.
**
** The conflicting row, in this case, is the database row with the matching
** primary key.
**
** <dt>SQLITE_CHANGESET_NOTFOUND<dd>
** The conflict handler is invoked with CHANGESET_NOTFOUND as the second
** argument when processing a DELETE or UPDATE change if a row with the
** required PRIMARY KEY fields is not present in the database.
**
** There is no conflicting row in this case. The results of invoking the
** sqlite3changeset_conflict() API are undefined.
**
** <dt>SQLITE_CHANGESET_CONFLICT<dd>
** CHANGESET_CONFLICT is passed as the second argument to the conflict
** handler while processing an INSERT change if the operation would result
** in duplicate primary key values.
**
** The conflicting row in this case is the database row with the matching
** primary key.
**
** <dt>SQLITE_CHANGESET_FOREIGN_KEY<dd>
** If foreign key handling is enabled, and applying a changeset leaves the
** database in a state containing foreign key violations, the conflict
** handler is invoked with CHANGESET_FOREIGN_KEY as the second argument
** exactly once before the changeset is committed. If the conflict handler
** returns CHANGESET_OMIT, the changes, including those that caused the
** foreign key constraint violation, are committed. Or, if it returns
** CHANGESET_ABORT, the changeset is rolled back.
**
** No current or conflicting row information is provided. The only function
** it is possible to call on the supplied sqlite3_changeset_iter handle
** is sqlite3changeset_fk_conflicts().
**
** <dt>SQLITE_CHANGESET_CONSTRAINT<dd>
** If any other constraint violation occurs while applying a change (i.e.
** a UNIQUE, CHECK or NOT NULL constraint), the conflict handler is
** invoked with CHANGESET_CONSTRAINT as the second argument.
**
** There is no conflicting row in this case. The results of invoking the
** sqlite3changeset_conflict() API are undefined.
**
** </dl>
*/
#define SQLITE_CHANGESET_DATA 1
#define SQLITE_CHANGESET_NOTFOUND 2
#define SQLITE_CHANGESET_CONFLICT 3
#define SQLITE_CHANGESET_CONSTRAINT 4
#define SQLITE_CHANGESET_FOREIGN_KEY 5
/*
** CAPI3REF: Constants Returned By The Conflict Handler
**
** A conflict handler callback must return one of the following three values.
**
** <dl>
** <dt>SQLITE_CHANGESET_OMIT<dd>
** If a conflict handler returns this value no special action is taken. The
** change that caused the conflict is not applied. The session module
** continues to the next change in the changeset.
**
** <dt>SQLITE_CHANGESET_REPLACE<dd>
** This value may only be returned if the second argument to the conflict
** handler was SQLITE_CHANGESET_DATA or SQLITE_CHANGESET_CONFLICT. If this
** is not the case, any changes applied so far are rolled back and the
** call to sqlite3changeset_apply() returns SQLITE_MISUSE.
**
** If CHANGESET_REPLACE is returned by an SQLITE_CHANGESET_DATA conflict
** handler, then the conflicting row is either updated or deleted, depending
** on the type of change.
**
** If CHANGESET_REPLACE is returned by an SQLITE_CHANGESET_CONFLICT conflict
** handler, then the conflicting row is removed from the database and a
** second attempt to apply the change is made. If this second attempt fails,
** the original row is restored to the database before continuing.
**
** <dt>SQLITE_CHANGESET_ABORT<dd>
** If this value is returned, any changes applied so far are rolled back
** and the call to sqlite3changeset_apply() returns SQLITE_ABORT.
** </dl>
*/
#define SQLITE_CHANGESET_OMIT 0
#define SQLITE_CHANGESET_REPLACE 1
#define SQLITE_CHANGESET_ABORT 2
/*
** CAPI3REF: Rebasing changesets
** EXPERIMENTAL
**
** Suppose there is a site hosting a database in state S0. And that
** modifications are made that move that database to state S1 and a
** changeset recorded (the "local" changeset). Then, a changeset based
** on S0 is received from another site (the "remote" changeset) and
** applied to the database. The database is then in state
** (S1+"remote"), where the exact state depends on any conflict
** resolution decisions (OMIT or REPLACE) made while applying "remote".
** Rebasing a changeset is to update it to take those conflict
** resolution decisions into account, so that the same conflicts
** do not have to be resolved elsewhere in the network.
**
** For example, if both the local and remote changesets contain an
** INSERT of the same key on "CREATE TABLE t1(a PRIMARY KEY, b)":
**
** local: INSERT INTO t1 VALUES(1, 'v1');
** remote: INSERT INTO t1 VALUES(1, 'v2');
**
** and the conflict resolution is REPLACE, then the INSERT change is
** removed from the local changeset (it was overridden). Or, if the
** conflict resolution was "OMIT", then the local changeset is modified
** to instead contain:
**
** UPDATE t1 SET b = 'v2' WHERE a=1;
**
** Changes within the local changeset are rebased as follows:
**
** <dl>
** <dt>Local INSERT<dd>
** This may only conflict with a remote INSERT. If the conflict
** resolution was OMIT, then add an UPDATE change to the rebased
** changeset. Or, if the conflict resolution was REPLACE, add
** nothing to the rebased changeset.
**
** <dt>Local DELETE<dd>
** This may conflict with a remote UPDATE or DELETE. In both cases the
** only possible resolution is OMIT. If the remote operation was a
** DELETE, then add no change to the rebased changeset. If the remote
** operation was an UPDATE, then the old.* fields of change are updated
** to reflect the new.* values in the UPDATE.
**
** <dt>Local UPDATE<dd>
** This may conflict with a remote UPDATE or DELETE. If it conflicts
** with a DELETE, and the conflict resolution was OMIT, then the update
** is changed into an INSERT. Any undefined values in the new.* record
** from the update change are filled in using the old.* values from
** the conflicting DELETE. Or, if the conflict resolution was REPLACE,
** the UPDATE change is simply omitted from the rebased changeset.
**
** If conflict is with a remote UPDATE and the resolution is OMIT, then
** the old.* values are rebased using the new.* values in the remote
** change. Or, if the resolution is REPLACE, then the change is copied
** into the rebased changeset with updates to columns also updated by
** the conflicting remote UPDATE removed. If this means no columns would
** be updated, the change is omitted.
** </dl>
**
** A local change may be rebased against multiple remote changes
** simultaneously. If a single key is modified by multiple remote
** changesets, they are combined as follows before the local changeset
** is rebased:
**
** <ul>
** <li> If there has been one or more REPLACE resolutions on a
** key, it is rebased according to a REPLACE.
**
** <li> If there have been no REPLACE resolutions on a key, then
** the local changeset is rebased according to the most recent
** of the OMIT resolutions.
** </ul>
**
** Note that conflict resolutions from multiple remote changesets are
** combined on a per-field basis, not per-row. This means that in the
** case of multiple remote UPDATE operations, some fields of a single
** local change may be rebased for REPLACE while others are rebased for
** OMIT.
**
** In order to rebase a local changeset, the remote changeset must first
** be applied to the local database using sqlite3changeset_apply_v2() and
** the buffer of rebase information captured. Then:
**
** <ol>
** <li> An sqlite3_rebaser object is created by calling
** sqlite3rebaser_create().
** <li> The new object is configured with the rebase buffer obtained from
** sqlite3changeset_apply_v2() by calling sqlite3rebaser_configure().
** If the local changeset is to be rebased against multiple remote
** changesets, then sqlite3rebaser_configure() should be called
** multiple times, in the same order that the multiple
** sqlite3changeset_apply_v2() calls were made.
** <li> Each local changeset is rebased by calling sqlite3rebaser_rebase().
** <li> The sqlite3_rebaser object is deleted by calling
** sqlite3rebaser_delete().
** </ol>
*/
typedef struct sqlite3_rebaser sqlite3_rebaser;
/*
** CAPI3REF: Create a changeset rebaser object.
** EXPERIMENTAL
**
** Allocate a new changeset rebaser object. If successful, set (*ppNew) to
** point to the new object and return SQLITE_OK. Otherwise, if an error
** occurs, return an SQLite error code (e.g. SQLITE_NOMEM) and set (*ppNew)
** to NULL.
*/
int sqlite3rebaser_create(sqlite3_rebaser **ppNew);
/*
** CAPI3REF: Configure a changeset rebaser object.
** EXPERIMENTAL
**
** Configure the changeset rebaser object to rebase changesets according
** to the conflict resolutions described by buffer pRebase (size nRebase
** bytes), which must have been obtained from a previous call to
** sqlite3changeset_apply_v2().
*/
int sqlite3rebaser_configure(
sqlite3_rebaser*,
int nRebase, const void *pRebase
);
/*
** CAPI3REF: Rebase a changeset
** EXPERIMENTAL
**
** Argument pIn must point to a buffer containing a changeset nIn bytes
** in size. This function allocates and populates a buffer with a copy
** of the changeset rebased according to the configuration of the
** rebaser object passed as the first argument. If successful, (*ppOut)
** is set to point to the new buffer containing the rebased changeset and
** (*pnOut) to its size in bytes and SQLITE_OK returned. It is the
** responsibility of the caller to eventually free the new buffer using
** sqlite3_free(). Otherwise, if an error occurs, (*ppOut) and (*pnOut)
** are set to zero and an SQLite error code returned.
*/
int sqlite3rebaser_rebase(
sqlite3_rebaser*,
int nIn, const void *pIn,
int *pnOut, void **ppOut
);
/*
** CAPI3REF: Delete a changeset rebaser object.
** EXPERIMENTAL
**
** Delete the changeset rebaser object and all associated resources. There
** should be one call to this function for each successful invocation
** of sqlite3rebaser_create().
*/
void sqlite3rebaser_delete(sqlite3_rebaser *p);
/*
** CAPI3REF: Streaming Versions of API functions.
**
** The six streaming API xxx_strm() functions serve similar purposes to the
** corresponding non-streaming API functions:
**
** <table border=1 style="margin-left:8ex;margin-right:8ex">
** <tr><th>Streaming function<th>Non-streaming equivalent</th>
** <tr><td>sqlite3changeset_apply_strm<td>[sqlite3changeset_apply]
** <tr><td>sqlite3changeset_apply_strm_v2<td>[sqlite3changeset_apply_v2]
** <tr><td>sqlite3changeset_concat_strm<td>[sqlite3changeset_concat]
** <tr><td>sqlite3changeset_invert_strm<td>[sqlite3changeset_invert]
** <tr><td>sqlite3changeset_start_strm<td>[sqlite3changeset_start]
** <tr><td>sqlite3session_changeset_strm<td>[sqlite3session_changeset]
** <tr><td>sqlite3session_patchset_strm<td>[sqlite3session_patchset]
** </table>
**
** Non-streaming functions that accept changesets (or patchsets) as input
** require that the entire changeset be stored in a single buffer in memory.
** Similarly, those that return a changeset or patchset do so by returning
** a pointer to a single large buffer allocated using sqlite3_malloc().
** Normally this is convenient. However, if an application running in a
** low-memory environment is required to handle very large changesets, the
** large contiguous memory allocations required can become onerous.
**
** In order to avoid this problem, instead of a single large buffer, input
** is passed to a streaming API functions by way of a callback function that
** the sessions module invokes to incrementally request input data as it is
** required. In all cases, a pair of API function parameters such as
**
** <pre>
** int nChangeset,
** void *pChangeset,
** </pre>
**
** Is replaced by:
**
** <pre>
** int (*xInput)(void *pIn, void *pData, int *pnData),
** void *pIn,
** </pre>
**
** Each time the xInput callback is invoked by the sessions module, the first
** argument passed is a copy of the supplied pIn context pointer. The second
** argument, pData, points to a buffer (*pnData) bytes in size. Assuming no
** error occurs the xInput method should copy up to (*pnData) bytes of data
** into the buffer and set (*pnData) to the actual number of bytes copied
** before returning SQLITE_OK. If the input is completely exhausted, (*pnData)
** should be set to zero to indicate this. Or, if an error occurs, an SQLite
** error code should be returned. In all cases, if an xInput callback returns
** an error, all processing is abandoned and the streaming API function
** returns a copy of the error code to the caller.
**
** In the case of sqlite3changeset_start_strm(), the xInput callback may be
** invoked by the sessions module at any point during the lifetime of the
** iterator. If such an xInput callback returns an error, the iterator enters
** an error state, whereby all subsequent calls to iterator functions
** immediately fail with the same error code as returned by xInput.
**
** Similarly, streaming API functions that return changesets (or patchsets)
** return them in chunks by way of a callback function instead of via a
** pointer to a single large buffer. In this case, a pair of parameters such
** as:
**
** <pre>
** int *pnChangeset,
** void **ppChangeset,
** </pre>
**
** Is replaced by:
**
** <pre>
** int (*xOutput)(void *pOut, const void *pData, int nData),
** void *pOut
** </pre>
**
** The xOutput callback is invoked zero or more times to return data to
** the application. The first parameter passed to each call is a copy of the
** pOut pointer supplied by the application. The second parameter, pData,
** points to a buffer nData bytes in size containing the chunk of output
** data being returned. If the xOutput callback successfully processes the
** supplied data, it should return SQLITE_OK to indicate success. Otherwise,
** it should return some other SQLite error code. In this case processing
** is immediately abandoned and the streaming API function returns a copy
** of the xOutput error code to the application.
**
** The sessions module never invokes an xOutput callback with the third
** parameter set to a value less than or equal to zero. Other than this,
** no guarantees are made as to the size of the chunks of data returned.
*/
int sqlite3changeset_apply_strm(
sqlite3 *db, /* Apply change to "main" db of this handle */
int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
void *pIn, /* First arg for xInput */
int(*xFilter)(
void *pCtx, /* Copy of sixth arg to _apply() */
const char *zTab /* Table name */
),
int(*xConflict)(
void *pCtx, /* Copy of sixth arg to _apply() */
int eConflict, /* DATA, MISSING, CONFLICT, CONSTRAINT */
sqlite3_changeset_iter *p /* Handle describing change and conflict */
),
void *pCtx /* First argument passed to xConflict */
);
int sqlite3changeset_apply_v2_strm(
sqlite3 *db, /* Apply change to "main" db of this handle */
int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
void *pIn, /* First arg for xInput */
int(*xFilter)(
void *pCtx, /* Copy of sixth arg to _apply() */
const char *zTab /* Table name */
),
int(*xConflict)(
void *pCtx, /* Copy of sixth arg to _apply() */
int eConflict, /* DATA, MISSING, CONFLICT, CONSTRAINT */
sqlite3_changeset_iter *p /* Handle describing change and conflict */
),
void *pCtx, /* First argument passed to xConflict */
void **ppRebase, int *pnRebase,
int flags
);
int sqlite3changeset_concat_strm(
int (*xInputA)(void *pIn, void *pData, int *pnData),
void *pInA,
int (*xInputB)(void *pIn, void *pData, int *pnData),
void *pInB,
int (*xOutput)(void *pOut, const void *pData, int nData),
void *pOut
);
int sqlite3changeset_invert_strm(
int (*xInput)(void *pIn, void *pData, int *pnData),
void *pIn,
int (*xOutput)(void *pOut, const void *pData, int nData),
void *pOut
);
int sqlite3changeset_start_strm(
sqlite3_changeset_iter **pp,
int (*xInput)(void *pIn, void *pData, int *pnData),
void *pIn
);
int sqlite3changeset_start_v2_strm(
sqlite3_changeset_iter **pp,
int (*xInput)(void *pIn, void *pData, int *pnData),
void *pIn,
int flags
);
int sqlite3session_changeset_strm(
sqlite3_session *pSession,
int (*xOutput)(void *pOut, const void *pData, int nData),
void *pOut
);
int sqlite3session_patchset_strm(
sqlite3_session *pSession,
int (*xOutput)(void *pOut, const void *pData, int nData),
void *pOut
);
int sqlite3changegroup_add_strm(sqlite3_changegroup*,
int (*xInput)(void *pIn, void *pData, int *pnData),
void *pIn
);
int sqlite3changegroup_output_strm(sqlite3_changegroup*,
int (*xOutput)(void *pOut, const void *pData, int nData),
void *pOut
);
int sqlite3rebaser_rebase_strm(
sqlite3_rebaser *pRebaser,
int (*xInput)(void *pIn, void *pData, int *pnData),
void *pIn,
int (*xOutput)(void *pOut, const void *pData, int nData),
void *pOut
);
/*
** CAPI3REF: Configure global parameters
**
** The sqlite3session_config() interface is used to make global configuration
** changes to the sessions module in order to tune it to the specific needs
** of the application.
**
** The sqlite3session_config() interface is not threadsafe. If it is invoked
** while any other thread is inside any other sessions method then the
** results are undefined. Furthermore, if it is invoked after any sessions
** related objects have been created, the results are also undefined.
**
** The first argument to the sqlite3session_config() function must be one
** of the SQLITE_SESSION_CONFIG_XXX constants defined below. The
** interpretation of the (void*) value passed as the second parameter and
** the effect of calling this function depends on the value of the first
** parameter.
**
** <dl>
** <dt>SQLITE_SESSION_CONFIG_STRMSIZE<dd>
** By default, the sessions module streaming interfaces attempt to input
** and output data in approximately 1 KiB chunks. This operand may be used
** to set and query the value of this configuration setting. The pointer
** passed as the second argument must point to a value of type (int).
** If this value is greater than 0, it is used as the new streaming data
** chunk size for both input and output. Before returning, the (int) value
** pointed to by pArg is set to the final value of the streaming interface
** chunk size.
** </dl>
**
** This function returns SQLITE_OK if successful, or an SQLite error code
** otherwise.
*/
int sqlite3session_config(int op, void *pArg);
/*
** CAPI3REF: Values for sqlite3session_config().
*/
#define SQLITE_SESSION_CONFIG_STRMSIZE 1
/*
** Make sure we can call this stuff from C++.
*/
#ifdef __cplusplus
}
#endif
#endif /* !defined(__SQLITESESSION_H_) && defined(SQLITE_ENABLE_SESSION) */
| 77,180 | 1,722 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/rtree.h | /*
** 2008 May 26
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This header file is used by programs that want to link against the
** RTREE library. All it does is declare the sqlite3RtreeInit() interface.
*/
#include "third_party/sqlite3/sqlite3.h"
#ifdef SQLITE_OMIT_VIRTUALTABLE
# undef SQLITE_ENABLE_RTREE
#endif
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
int sqlite3RtreeInit(sqlite3 *db);
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
| 796 | 31 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/pager.c | /*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This is the implementation of the page cache subsystem or "pager".
**
** The pager is used to access a database disk file. It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file. The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
*/
#ifndef SQLITE_OMIT_DISKIO
#include "third_party/sqlite3/sqliteInt.h"
#include "third_party/sqlite3/wal.h"
/******************* NOTES ON THE DESIGN OF THE PAGER ************************
**
** This comment block describes invariants that hold when using a rollback
** journal. These invariants do not apply for journal_mode=WAL,
** journal_mode=MEMORY, or journal_mode=OFF.
**
** Within this comment block, a page is deemed to have been synced
** automatically as soon as it is written when PRAGMA synchronous=OFF.
** Otherwise, the page is not synced until the xSync method of the VFS
** is called successfully on the file containing the page.
**
** Definition: A page of the database file is said to be "overwriteable" if
** one or more of the following are true about the page:
**
** (a) The original content of the page as it was at the beginning of
** the transaction has been written into the rollback journal and
** synced.
**
** (b) The page was a freelist leaf page at the start of the transaction.
**
** (c) The page number is greater than the largest page that existed in
** the database file at the start of the transaction.
**
** (1) A page of the database file is never overwritten unless one of the
** following are true:
**
** (a) The page and all other pages on the same sector are overwriteable.
**
** (b) The atomic page write optimization is enabled, and the entire
** transaction other than the update of the transaction sequence
** number consists of a single page change.
**
** (2) The content of a page written into the rollback journal exactly matches
** both the content in the database when the rollback journal was written
** and the content in the database at the beginning of the current
** transaction.
**
** (3) Writes to the database file are an integer multiple of the page size
** in length and are aligned on a page boundary.
**
** (4) Reads from the database file are either aligned on a page boundary and
** an integer multiple of the page size in length or are taken from the
** first 100 bytes of the database file.
**
** (5) All writes to the database file are synced prior to the rollback journal
** being deleted, truncated, or zeroed.
**
** (6) If a super-journal file is used, then all writes to the database file
** are synced prior to the super-journal being deleted.
**
** Definition: Two databases (or the same database at two points it time)
** are said to be "logically equivalent" if they give the same answer to
** all queries. Note in particular the content of freelist leaf
** pages can be changed arbitrarily without affecting the logical equivalence
** of the database.
**
** (7) At any time, if any subset, including the empty set and the total set,
** of the unsynced changes to a rollback journal are removed and the
** journal is rolled back, the resulting database file will be logically
** equivalent to the database file at the beginning of the transaction.
**
** (8) When a transaction is rolled back, the xTruncate method of the VFS
** is called to restore the database file to the same size it was at
** the beginning of the transaction. (In some VFSes, the xTruncate
** method is a no-op, but that does not change the fact the SQLite will
** invoke it.)
**
** (9) Whenever the database file is modified, at least one bit in the range
** of bytes from 24 through 39 inclusive will be changed prior to releasing
** the EXCLUSIVE lock, thus signaling other connections on the same
** database to flush their caches.
**
** (10) The pattern of bits in bytes 24 through 39 shall not repeat in less
** than one billion transactions.
**
** (11) A database file is well-formed at the beginning and at the conclusion
** of every transaction.
**
** (12) An EXCLUSIVE lock is held on the database file when writing to
** the database file.
**
** (13) A SHARED lock is held on the database file while reading any
** content out of the database file.
**
******************************************************************************/
/*
** Macros for troubleshooting. Normally turned off
*/
#if 0
int sqlite3PagerTrace=1; /* True to enable tracing */
#define sqlite3DebugPrintf printf
#define PAGERTRACE(X) if( sqlite3PagerTrace ){ sqlite3DebugPrintf X; }
#else
#define PAGERTRACE(X)
#endif
/*
** The following two macros are used within the PAGERTRACE() macros above
** to print out file-descriptors.
**
** PAGERID() takes a pointer to a Pager struct as its argument. The
** associated file-descriptor is returned. FILEHANDLEID() takes an sqlite3_file
** struct as its argument.
*/
#define PAGERID(p) (SQLITE_PTR_TO_INT(p->fd))
#define FILEHANDLEID(fd) (SQLITE_PTR_TO_INT(fd))
/*
** The Pager.eState variable stores the current 'state' of a pager. A
** pager may be in any one of the seven states shown in the following
** state diagram.
**
** OPEN <------+------+
** | | |
** V | |
** +---------> READER-------+ |
** | | |
** | V |
** |<-------WRITER_LOCKED------> ERROR
** | | ^
** | V |
** |<------WRITER_CACHEMOD-------->|
** | | |
** | V |
** |<-------WRITER_DBMOD---------->|
** | | |
** | V |
** +<------WRITER_FINISHED-------->+
**
**
** List of state transitions and the C [function] that performs each:
**
** OPEN -> READER [sqlite3PagerSharedLock]
** READER -> OPEN [pager_unlock]
**
** READER -> WRITER_LOCKED [sqlite3PagerBegin]
** WRITER_LOCKED -> WRITER_CACHEMOD [pager_open_journal]
** WRITER_CACHEMOD -> WRITER_DBMOD [syncJournal]
** WRITER_DBMOD -> WRITER_FINISHED [sqlite3PagerCommitPhaseOne]
** WRITER_*** -> READER [pager_end_transaction]
**
** WRITER_*** -> ERROR [pager_error]
** ERROR -> OPEN [pager_unlock]
**
**
** OPEN:
**
** The pager starts up in this state. Nothing is guaranteed in this
** state - the file may or may not be locked and the database size is
** unknown. The database may not be read or written.
**
** * No read or write transaction is active.
** * Any lock, or no lock at all, may be held on the database file.
** * The dbSize, dbOrigSize and dbFileSize variables may not be trusted.
**
** READER:
**
** In this state all the requirements for reading the database in
** rollback (non-WAL) mode are met. Unless the pager is (or recently
** was) in exclusive-locking mode, a user-level read transaction is
** open. The database size is known in this state.
**
** A connection running with locking_mode=normal enters this state when
** it opens a read-transaction on the database and returns to state
** OPEN after the read-transaction is completed. However a connection
** running in locking_mode=exclusive (including temp databases) remains in
** this state even after the read-transaction is closed. The only way
** a locking_mode=exclusive connection can transition from READER to OPEN
** is via the ERROR state (see below).
**
** * A read transaction may be active (but a write-transaction cannot).
** * A SHARED or greater lock is held on the database file.
** * The dbSize variable may be trusted (even if a user-level read
** transaction is not active). The dbOrigSize and dbFileSize variables
** may not be trusted at this point.
** * If the database is a WAL database, then the WAL connection is open.
** * Even if a read-transaction is not open, it is guaranteed that
** there is no hot-journal in the file-system.
**
** WRITER_LOCKED:
**
** The pager moves to this state from READER when a write-transaction
** is first opened on the database. In WRITER_LOCKED state, all locks
** required to start a write-transaction are held, but no actual
** modifications to the cache or database have taken place.
**
** In rollback mode, a RESERVED or (if the transaction was opened with
** BEGIN EXCLUSIVE) EXCLUSIVE lock is obtained on the database file when
** moving to this state, but the journal file is not written to or opened
** to in this state. If the transaction is committed or rolled back while
** in WRITER_LOCKED state, all that is required is to unlock the database
** file.
**
** IN WAL mode, WalBeginWriteTransaction() is called to lock the log file.
** If the connection is running with locking_mode=exclusive, an attempt
** is made to obtain an EXCLUSIVE lock on the database file.
**
** * A write transaction is active.
** * If the connection is open in rollback-mode, a RESERVED or greater
** lock is held on the database file.
** * If the connection is open in WAL-mode, a WAL write transaction
** is open (i.e. sqlite3WalBeginWriteTransaction() has been successfully
** called).
** * The dbSize, dbOrigSize and dbFileSize variables are all valid.
** * The contents of the pager cache have not been modified.
** * The journal file may or may not be open.
** * Nothing (not even the first header) has been written to the journal.
**
** WRITER_CACHEMOD:
**
** A pager moves from WRITER_LOCKED state to this state when a page is
** first modified by the upper layer. In rollback mode the journal file
** is opened (if it is not already open) and a header written to the
** start of it. The database file on disk has not been modified.
**
** * A write transaction is active.
** * A RESERVED or greater lock is held on the database file.
** * The journal file is open and the first header has been written
** to it, but the header has not been synced to disk.
** * The contents of the page cache have been modified.
**
** WRITER_DBMOD:
**
** The pager transitions from WRITER_CACHEMOD into WRITER_DBMOD state
** when it modifies the contents of the database file. WAL connections
** never enter this state (since they do not modify the database file,
** just the log file).
**
** * A write transaction is active.
** * An EXCLUSIVE or greater lock is held on the database file.
** * The journal file is open and the first header has been written
** and synced to disk.
** * The contents of the page cache have been modified (and possibly
** written to disk).
**
** WRITER_FINISHED:
**
** It is not possible for a WAL connection to enter this state.
**
** A rollback-mode pager changes to WRITER_FINISHED state from WRITER_DBMOD
** state after the entire transaction has been successfully written into the
** database file. In this state the transaction may be committed simply
** by finalizing the journal file. Once in WRITER_FINISHED state, it is
** not possible to modify the database further. At this point, the upper
** layer must either commit or rollback the transaction.
**
** * A write transaction is active.
** * An EXCLUSIVE or greater lock is held on the database file.
** * All writing and syncing of journal and database data has finished.
** If no error occurred, all that remains is to finalize the journal to
** commit the transaction. If an error did occur, the caller will need
** to rollback the transaction.
**
** ERROR:
**
** The ERROR state is entered when an IO or disk-full error (including
** SQLITE_IOERR_NOMEM) occurs at a point in the code that makes it
** difficult to be sure that the in-memory pager state (cache contents,
** db size etc.) are consistent with the contents of the file-system.
**
** Temporary pager files may enter the ERROR state, but in-memory pagers
** cannot.
**
** For example, if an IO error occurs while performing a rollback,
** the contents of the page-cache may be left in an inconsistent state.
** At this point it would be dangerous to change back to READER state
** (as usually happens after a rollback). Any subsequent readers might
** report database corruption (due to the inconsistent cache), and if
** they upgrade to writers, they may inadvertently corrupt the database
** file. To avoid this hazard, the pager switches into the ERROR state
** instead of READER following such an error.
**
** Once it has entered the ERROR state, any attempt to use the pager
** to read or write data returns an error. Eventually, once all
** outstanding transactions have been abandoned, the pager is able to
** transition back to OPEN state, discarding the contents of the
** page-cache and any other in-memory state at the same time. Everything
** is reloaded from disk (and, if necessary, hot-journal rollback peformed)
** when a read-transaction is next opened on the pager (transitioning
** the pager into READER state). At that point the system has recovered
** from the error.
**
** Specifically, the pager jumps into the ERROR state if:
**
** 1. An error occurs while attempting a rollback. This happens in
** function sqlite3PagerRollback().
**
** 2. An error occurs while attempting to finalize a journal file
** following a commit in function sqlite3PagerCommitPhaseTwo().
**
** 3. An error occurs while attempting to write to the journal or
** database file in function pagerStress() in order to free up
** memory.
**
** In other cases, the error is returned to the b-tree layer. The b-tree
** layer then attempts a rollback operation. If the error condition
** persists, the pager enters the ERROR state via condition (1) above.
**
** Condition (3) is necessary because it can be triggered by a read-only
** statement executed within a transaction. In this case, if the error
** code were simply returned to the user, the b-tree layer would not
** automatically attempt a rollback, as it assumes that an error in a
** read-only statement cannot leave the pager in an internally inconsistent
** state.
**
** * The Pager.errCode variable is set to something other than SQLITE_OK.
** * There are one or more outstanding references to pages (after the
** last reference is dropped the pager should move back to OPEN state).
** * The pager is not an in-memory pager.
**
**
** Notes:
**
** * A pager is never in WRITER_DBMOD or WRITER_FINISHED state if the
** connection is open in WAL mode. A WAL connection is always in one
** of the first four states.
**
** * Normally, a connection open in exclusive mode is never in PAGER_OPEN
** state. There are two exceptions: immediately after exclusive-mode has
** been turned on (and before any read or write transactions are
** executed), and when the pager is leaving the "error state".
**
** * See also: assert_pager_state().
*/
#define PAGER_OPEN 0
#define PAGER_READER 1
#define PAGER_WRITER_LOCKED 2
#define PAGER_WRITER_CACHEMOD 3
#define PAGER_WRITER_DBMOD 4
#define PAGER_WRITER_FINISHED 5
#define PAGER_ERROR 6
/*
** The Pager.eLock variable is almost always set to one of the
** following locking-states, according to the lock currently held on
** the database file: NO_LOCK, SHARED_LOCK, RESERVED_LOCK or EXCLUSIVE_LOCK.
** This variable is kept up to date as locks are taken and released by
** the pagerLockDb() and pagerUnlockDb() wrappers.
**
** If the VFS xLock() or xUnlock() returns an error other than SQLITE_BUSY
** (i.e. one of the SQLITE_IOERR subtypes), it is not clear whether or not
** the operation was successful. In these circumstances pagerLockDb() and
** pagerUnlockDb() take a conservative approach - eLock is always updated
** when unlocking the file, and only updated when locking the file if the
** VFS call is successful. This way, the Pager.eLock variable may be set
** to a less exclusive (lower) value than the lock that is actually held
** at the system level, but it is never set to a more exclusive value.
**
** This is usually safe. If an xUnlock fails or appears to fail, there may
** be a few redundant xLock() calls or a lock may be held for longer than
** required, but nothing really goes wrong.
**
** The exception is when the database file is unlocked as the pager moves
** from ERROR to OPEN state. At this point there may be a hot-journal file
** in the file-system that needs to be rolled back (as part of an OPEN->SHARED
** transition, by the same pager or any other). If the call to xUnlock()
** fails at this point and the pager is left holding an EXCLUSIVE lock, this
** can confuse the call to xCheckReservedLock() call made later as part
** of hot-journal detection.
**
** xCheckReservedLock() is defined as returning true "if there is a RESERVED
** lock held by this process or any others". So xCheckReservedLock may
** return true because the caller itself is holding an EXCLUSIVE lock (but
** doesn't know it because of a previous error in xUnlock). If this happens
** a hot-journal may be mistaken for a journal being created by an active
** transaction in another process, causing SQLite to read from the database
** without rolling it back.
**
** To work around this, if a call to xUnlock() fails when unlocking the
** database in the ERROR state, Pager.eLock is set to UNKNOWN_LOCK. It
** is only changed back to a real locking state after a successful call
** to xLock(EXCLUSIVE). Also, the code to do the OPEN->SHARED state transition
** omits the check for a hot-journal if Pager.eLock is set to UNKNOWN_LOCK
** lock. Instead, it assumes a hot-journal exists and obtains an EXCLUSIVE
** lock on the database file before attempting to roll it back. See function
** PagerSharedLock() for more detail.
**
** Pager.eLock may only be set to UNKNOWN_LOCK when the pager is in
** PAGER_OPEN state.
*/
#define UNKNOWN_LOCK (EXCLUSIVE_LOCK+1)
/*
** The maximum allowed sector size. 64KiB. If the xSectorsize() method
** returns a value larger than this, then MAX_SECTOR_SIZE is used instead.
** This could conceivably cause corruption following a power failure on
** such a system. This is currently an undocumented limit.
*/
#define MAX_SECTOR_SIZE 0x10000
/*
** An instance of the following structure is allocated for each active
** savepoint and statement transaction in the system. All such structures
** are stored in the Pager.aSavepoint[] array, which is allocated and
** resized using sqlite3Realloc().
**
** When a savepoint is created, the PagerSavepoint.iHdrOffset field is
** set to 0. If a journal-header is written into the main journal while
** the savepoint is active, then iHdrOffset is set to the byte offset
** immediately following the last journal record written into the main
** journal before the journal-header. This is required during savepoint
** rollback (see pagerPlaybackSavepoint()).
*/
typedef struct PagerSavepoint PagerSavepoint;
struct PagerSavepoint {
i64 iOffset; /* Starting offset in main journal */
i64 iHdrOffset; /* See above */
Bitvec *pInSavepoint; /* Set of pages in this savepoint */
Pgno nOrig; /* Original number of pages in file */
Pgno iSubRec; /* Index of first record in sub-journal */
int bTruncateOnRelease; /* If stmt journal may be truncated on RELEASE */
#ifndef SQLITE_OMIT_WAL
u32 aWalData[WAL_SAVEPOINT_NDATA]; /* WAL savepoint context */
#endif
};
/*
** Bits of the Pager.doNotSpill flag. See further description below.
*/
#define SPILLFLAG_OFF 0x01 /* Never spill cache. Set via pragma */
#define SPILLFLAG_ROLLBACK 0x02 /* Current rolling back, so do not spill */
#define SPILLFLAG_NOSYNC 0x04 /* Spill is ok, but do not sync */
/*
** An open page cache is an instance of struct Pager. A description of
** some of the more important member variables follows:
**
** eState
**
** The current 'state' of the pager object. See the comment and state
** diagram above for a description of the pager state.
**
** eLock
**
** For a real on-disk database, the current lock held on the database file -
** NO_LOCK, SHARED_LOCK, RESERVED_LOCK or EXCLUSIVE_LOCK.
**
** For a temporary or in-memory database (neither of which require any
** locks), this variable is always set to EXCLUSIVE_LOCK. Since such
** databases always have Pager.exclusiveMode==1, this tricks the pager
** logic into thinking that it already has all the locks it will ever
** need (and no reason to release them).
**
** In some (obscure) circumstances, this variable may also be set to
** UNKNOWN_LOCK. See the comment above the #define of UNKNOWN_LOCK for
** details.
**
** changeCountDone
**
** This boolean variable is used to make sure that the change-counter
** (the 4-byte header field at byte offset 24 of the database file) is
** not updated more often than necessary.
**
** It is set to true when the change-counter field is updated, which
** can only happen if an exclusive lock is held on the database file.
** It is cleared (set to false) whenever an exclusive lock is
** relinquished on the database file. Each time a transaction is committed,
** The changeCountDone flag is inspected. If it is true, the work of
** updating the change-counter is omitted for the current transaction.
**
** This mechanism means that when running in exclusive mode, a connection
** need only update the change-counter once, for the first transaction
** committed.
**
** setSuper
**
** When PagerCommitPhaseOne() is called to commit a transaction, it may
** (or may not) specify a super-journal name to be written into the
** journal file before it is synced to disk.
**
** Whether or not a journal file contains a super-journal pointer affects
** the way in which the journal file is finalized after the transaction is
** committed or rolled back when running in "journal_mode=PERSIST" mode.
** If a journal file does not contain a super-journal pointer, it is
** finalized by overwriting the first journal header with zeroes. If
** it does contain a super-journal pointer the journal file is finalized
** by truncating it to zero bytes, just as if the connection were
** running in "journal_mode=truncate" mode.
**
** Journal files that contain super-journal pointers cannot be finalized
** simply by overwriting the first journal-header with zeroes, as the
** super-journal pointer could interfere with hot-journal rollback of any
** subsequently interrupted transaction that reuses the journal file.
**
** The flag is cleared as soon as the journal file is finalized (either
** by PagerCommitPhaseTwo or PagerRollback). If an IO error prevents the
** journal file from being successfully finalized, the setSuper flag
** is cleared anyway (and the pager will move to ERROR state).
**
** doNotSpill
**
** This variables control the behavior of cache-spills (calls made by
** the pcache module to the pagerStress() routine to write cached data
** to the file-system in order to free up memory).
**
** When bits SPILLFLAG_OFF or SPILLFLAG_ROLLBACK of doNotSpill are set,
** writing to the database from pagerStress() is disabled altogether.
** The SPILLFLAG_ROLLBACK case is done in a very obscure case that
** comes up during savepoint rollback that requires the pcache module
** to allocate a new page to prevent the journal file from being written
** while it is being traversed by code in pager_playback(). The SPILLFLAG_OFF
** case is a user preference.
**
** If the SPILLFLAG_NOSYNC bit is set, writing to the database from
** pagerStress() is permitted, but syncing the journal file is not.
** This flag is set by sqlite3PagerWrite() when the file-system sector-size
** is larger than the database page-size in order to prevent a journal sync
** from happening in between the journalling of two pages on the same sector.
**
** subjInMemory
**
** This is a boolean variable. If true, then any required sub-journal
** is opened as an in-memory journal file. If false, then in-memory
** sub-journals are only used for in-memory pager files.
**
** This variable is updated by the upper layer each time a new
** write-transaction is opened.
**
** dbSize, dbOrigSize, dbFileSize
**
** Variable dbSize is set to the number of pages in the database file.
** It is valid in PAGER_READER and higher states (all states except for
** OPEN and ERROR).
**
** dbSize is set based on the size of the database file, which may be
** larger than the size of the database (the value stored at offset
** 28 of the database header by the btree). If the size of the file
** is not an integer multiple of the page-size, the value stored in
** dbSize is rounded down (i.e. a 5KB file with 2K page-size has dbSize==2).
** Except, any file that is greater than 0 bytes in size is considered
** to have at least one page. (i.e. a 1KB file with 2K page-size leads
** to dbSize==1).
**
** During a write-transaction, if pages with page-numbers greater than
** dbSize are modified in the cache, dbSize is updated accordingly.
** Similarly, if the database is truncated using PagerTruncateImage(),
** dbSize is updated.
**
** Variables dbOrigSize and dbFileSize are valid in states
** PAGER_WRITER_LOCKED and higher. dbOrigSize is a copy of the dbSize
** variable at the start of the transaction. It is used during rollback,
** and to determine whether or not pages need to be journalled before
** being modified.
**
** Throughout a write-transaction, dbFileSize contains the size of
** the file on disk in pages. It is set to a copy of dbSize when the
** write-transaction is first opened, and updated when VFS calls are made
** to write or truncate the database file on disk.
**
** The only reason the dbFileSize variable is required is to suppress
** unnecessary calls to xTruncate() after committing a transaction. If,
** when a transaction is committed, the dbFileSize variable indicates
** that the database file is larger than the database image (Pager.dbSize),
** pager_truncate() is called. The pager_truncate() call uses xFilesize()
** to measure the database file on disk, and then truncates it if required.
** dbFileSize is not used when rolling back a transaction. In this case
** pager_truncate() is called unconditionally (which means there may be
** a call to xFilesize() that is not strictly required). In either case,
** pager_truncate() may cause the file to become smaller or larger.
**
** dbHintSize
**
** The dbHintSize variable is used to limit the number of calls made to
** the VFS xFileControl(FCNTL_SIZE_HINT) method.
**
** dbHintSize is set to a copy of the dbSize variable when a
** write-transaction is opened (at the same time as dbFileSize and
** dbOrigSize). If the xFileControl(FCNTL_SIZE_HINT) method is called,
** dbHintSize is increased to the number of pages that correspond to the
** size-hint passed to the method call. See pager_write_pagelist() for
** details.
**
** errCode
**
** The Pager.errCode variable is only ever used in PAGER_ERROR state. It
** is set to zero in all other states. In PAGER_ERROR state, Pager.errCode
** is always set to SQLITE_FULL, SQLITE_IOERR or one of the SQLITE_IOERR_XXX
** sub-codes.
**
** syncFlags, walSyncFlags
**
** syncFlags is either SQLITE_SYNC_NORMAL (0x02) or SQLITE_SYNC_FULL (0x03).
** syncFlags is used for rollback mode. walSyncFlags is used for WAL mode
** and contains the flags used to sync the checkpoint operations in the
** lower two bits, and sync flags used for transaction commits in the WAL
** file in bits 0x04 and 0x08. In other words, to get the correct sync flags
** for checkpoint operations, use (walSyncFlags&0x03) and to get the correct
** sync flags for transaction commit, use ((walSyncFlags>>2)&0x03). Note
** that with synchronous=NORMAL in WAL mode, transaction commit is not synced
** meaning that the 0x04 and 0x08 bits are both zero.
*/
struct Pager {
sqlite3_vfs *pVfs; /* OS functions to use for IO */
u8 exclusiveMode; /* Boolean. True if locking_mode==EXCLUSIVE */
u8 journalMode; /* One of the PAGER_JOURNALMODE_* values */
u8 useJournal; /* Use a rollback journal on this file */
u8 noSync; /* Do not sync the journal if true */
u8 fullSync; /* Do extra syncs of the journal for robustness */
u8 extraSync; /* sync directory after journal delete */
u8 syncFlags; /* SYNC_NORMAL or SYNC_FULL otherwise */
u8 walSyncFlags; /* See description above */
u8 tempFile; /* zFilename is a temporary or immutable file */
u8 noLock; /* Do not lock (except in WAL mode) */
u8 readOnly; /* True for a read-only database */
u8 memDb; /* True to inhibit all file I/O */
u8 memVfs; /* VFS-implemented memory database */
/**************************************************************************
** The following block contains those class members that change during
** routine operation. Class members not in this block are either fixed
** when the pager is first created or else only change when there is a
** significant mode change (such as changing the page_size, locking_mode,
** or the journal_mode). From another view, these class members describe
** the "state" of the pager, while other class members describe the
** "configuration" of the pager.
*/
u8 eState; /* Pager state (OPEN, READER, WRITER_LOCKED..) */
u8 eLock; /* Current lock held on database file */
u8 changeCountDone; /* Set after incrementing the change-counter */
u8 setSuper; /* Super-jrnl name is written into jrnl */
u8 doNotSpill; /* Do not spill the cache when non-zero */
u8 subjInMemory; /* True to use in-memory sub-journals */
u8 bUseFetch; /* True to use xFetch() */
u8 hasHeldSharedLock; /* True if a shared lock has ever been held */
Pgno dbSize; /* Number of pages in the database */
Pgno dbOrigSize; /* dbSize before the current transaction */
Pgno dbFileSize; /* Number of pages in the database file */
Pgno dbHintSize; /* Value passed to FCNTL_SIZE_HINT call */
int errCode; /* One of several kinds of errors */
int nRec; /* Pages journalled since last j-header written */
u32 cksumInit; /* Quasi-random value added to every checksum */
u32 nSubRec; /* Number of records written to sub-journal */
Bitvec *pInJournal; /* One bit for each page in the database file */
sqlite3_file *fd; /* File descriptor for database */
sqlite3_file *jfd; /* File descriptor for main journal */
sqlite3_file *sjfd; /* File descriptor for sub-journal */
i64 journalOff; /* Current write offset in the journal file */
i64 journalHdr; /* Byte offset to previous journal header */
sqlite3_backup *pBackup; /* Pointer to list of ongoing backup processes */
PagerSavepoint *aSavepoint; /* Array of active savepoints */
int nSavepoint; /* Number of elements in aSavepoint[] */
u32 iDataVersion; /* Changes whenever database content changes */
char dbFileVers[16]; /* Changes whenever database file changes */
int nMmapOut; /* Number of mmap pages currently outstanding */
sqlite3_int64 szMmap; /* Desired maximum mmap size */
PgHdr *pMmapFreelist; /* List of free mmap page headers (pDirty) */
/*
** End of the routinely-changing class members
***************************************************************************/
u16 nExtra; /* Add this many bytes to each in-memory page */
i16 nReserve; /* Number of unused bytes at end of each page */
u32 vfsFlags; /* Flags for sqlite3_vfs.xOpen() */
u32 sectorSize; /* Assumed sector size during rollback */
Pgno mxPgno; /* Maximum allowed size of the database */
Pgno lckPgno; /* Page number for the locking page */
i64 pageSize; /* Number of bytes in a page */
i64 journalSizeLimit; /* Size limit for persistent journal files */
char *zFilename; /* Name of the database file */
char *zJournal; /* Name of the journal file */
int (*xBusyHandler)(void*); /* Function to call when busy */
void *pBusyHandlerArg; /* Context argument for xBusyHandler */
int aStat[4]; /* Total cache hits, misses, writes, spills */
#ifdef SQLITE_TEST
int nRead; /* Database pages read */
#endif
void (*xReiniter)(DbPage*); /* Call this routine when reloading pages */
int (*xGet)(Pager*,Pgno,DbPage**,int); /* Routine to fetch a patch */
char *pTmpSpace; /* Pager.pageSize bytes of space for tmp use */
PCache *pPCache; /* Pointer to page cache object */
#ifndef SQLITE_OMIT_WAL
Wal *pWal; /* Write-ahead log used by "journal_mode=wal" */
char *zWal; /* File name for write-ahead log */
#endif
};
/*
** Indexes for use with Pager.aStat[]. The Pager.aStat[] array contains
** the values accessed by passing SQLITE_DBSTATUS_CACHE_HIT, CACHE_MISS
** or CACHE_WRITE to sqlite3_db_status().
*/
#define PAGER_STAT_HIT 0
#define PAGER_STAT_MISS 1
#define PAGER_STAT_WRITE 2
#define PAGER_STAT_SPILL 3
/*
** The following global variables hold counters used for
** testing purposes only. These variables do not exist in
** a non-testing build. These variables are not thread-safe.
*/
#ifdef SQLITE_TEST
int sqlite3_pager_readdb_count = 0; /* Number of full pages read from DB */
int sqlite3_pager_writedb_count = 0; /* Number of full pages written to DB */
int sqlite3_pager_writej_count = 0; /* Number of pages written to journal */
# define PAGER_INCR(v) v++
#else
# define PAGER_INCR(v)
#endif
/*
** Journal files begin with the following magic string. The data
** was obtained from /dev/random. It is used only as a sanity check.
**
** Since version 2.8.0, the journal format contains additional sanity
** checking information. If the power fails while the journal is being
** written, semi-random garbage data might appear in the journal
** file after power is restored. If an attempt is then made
** to roll the journal back, the database could be corrupted. The additional
** sanity checking data is an attempt to discover the garbage in the
** journal and ignore it.
**
** The sanity checking information for the new journal format consists
** of a 32-bit checksum on each page of data. The checksum covers both
** the page number and the pPager->pageSize bytes of data for the page.
** This cksum is initialized to a 32-bit random value that appears in the
** journal file right after the header. The random initializer is important,
** because garbage data that appears at the end of a journal is likely
** data that was once in other files that have now been deleted. If the
** garbage data came from an obsolete journal file, the checksums might
** be correct. But by initializing the checksum to random value which
** is different for every journal, we minimize that risk.
*/
static const unsigned char aJournalMagic[] = {
0xd9, 0xd5, 0x05, 0xf9, 0x20, 0xa1, 0x63, 0xd7,
};
/*
** The size of the of each page record in the journal is given by
** the following macro.
*/
#define JOURNAL_PG_SZ(pPager) ((pPager->pageSize) + 8)
/*
** The journal header size for this pager. This is usually the same
** size as a single disk sector. See also setSectorSize().
*/
#define JOURNAL_HDR_SZ(pPager) (pPager->sectorSize)
/*
** The macro MEMDB is true if we are dealing with an in-memory database.
** We do this as a macro so that if the SQLITE_OMIT_MEMORYDB macro is set,
** the value of MEMDB will be a constant and the compiler will optimize
** out code that would never execute.
*/
#ifdef SQLITE_OMIT_MEMORYDB
# define MEMDB 0
#else
# define MEMDB pPager->memDb
#endif
/*
** The macro USEFETCH is true if we are allowed to use the xFetch and xUnfetch
** interfaces to access the database using memory-mapped I/O.
*/
#if SQLITE_MAX_MMAP_SIZE>0
# define USEFETCH(x) ((x)->bUseFetch)
#else
# define USEFETCH(x) 0
#endif
/*
** The argument to this macro is a file descriptor (type sqlite3_file*).
** Return 0 if it is not open, or non-zero (but not 1) if it is.
**
** This is so that expressions can be written as:
**
** if( isOpen(pPager->jfd) ){ ...
**
** instead of
**
** if( pPager->jfd->pMethods ){ ...
*/
#define isOpen(pFd) ((pFd)->pMethods!=0)
#ifdef SQLITE_DIRECT_OVERFLOW_READ
/*
** Return true if page pgno can be read directly from the database file
** by the b-tree layer. This is the case if:
**
** * the database file is open,
** * there are no dirty pages in the cache, and
** * the desired page is not currently in the wal file.
*/
int sqlite3PagerDirectReadOk(Pager *pPager, Pgno pgno){
if( pPager->fd->pMethods==0 ) return 0;
if( sqlite3PCacheIsDirty(pPager->pPCache) ) return 0;
#ifndef SQLITE_OMIT_WAL
if( pPager->pWal ){
u32 iRead = 0;
int rc;
rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iRead);
return (rc==SQLITE_OK && iRead==0);
}
#endif
return 1;
}
#endif
#ifndef SQLITE_OMIT_WAL
# define pagerUseWal(x) ((x)->pWal!=0)
#else
# define pagerUseWal(x) 0
# define pagerRollbackWal(x) 0
# define pagerWalFrames(v,w,x,y) 0
# define pagerOpenWalIfPresent(z) SQLITE_OK
# define pagerBeginReadTransaction(z) SQLITE_OK
#endif
#ifndef NDEBUG
/*
** Usage:
**
** assert( assert_pager_state(pPager) );
**
** This function runs many asserts to try to find inconsistencies in
** the internal state of the Pager object.
*/
static int assert_pager_state(Pager *p){
Pager *pPager = p;
/* State must be valid. */
assert( p->eState==PAGER_OPEN
|| p->eState==PAGER_READER
|| p->eState==PAGER_WRITER_LOCKED
|| p->eState==PAGER_WRITER_CACHEMOD
|| p->eState==PAGER_WRITER_DBMOD
|| p->eState==PAGER_WRITER_FINISHED
|| p->eState==PAGER_ERROR
);
/* Regardless of the current state, a temp-file connection always behaves
** as if it has an exclusive lock on the database file. It never updates
** the change-counter field, so the changeCountDone flag is always set.
*/
assert( p->tempFile==0 || p->eLock==EXCLUSIVE_LOCK );
assert( p->tempFile==0 || pPager->changeCountDone );
/* If the useJournal flag is clear, the journal-mode must be "OFF".
** And if the journal-mode is "OFF", the journal file must not be open.
*/
assert( p->journalMode==PAGER_JOURNALMODE_OFF || p->useJournal );
assert( p->journalMode!=PAGER_JOURNALMODE_OFF || !isOpen(p->jfd) );
/* Check that MEMDB implies noSync. And an in-memory journal. Since
** this means an in-memory pager performs no IO at all, it cannot encounter
** either SQLITE_IOERR or SQLITE_FULL during rollback or while finalizing
** a journal file. (although the in-memory journal implementation may
** return SQLITE_IOERR_NOMEM while the journal file is being written). It
** is therefore not possible for an in-memory pager to enter the ERROR
** state.
*/
if( MEMDB ){
assert( !isOpen(p->fd) );
assert( p->noSync );
assert( p->journalMode==PAGER_JOURNALMODE_OFF
|| p->journalMode==PAGER_JOURNALMODE_MEMORY
);
assert( p->eState!=PAGER_ERROR && p->eState!=PAGER_OPEN );
assert( pagerUseWal(p)==0 );
}
/* If changeCountDone is set, a RESERVED lock or greater must be held
** on the file.
*/
assert( pPager->changeCountDone==0 || pPager->eLock>=RESERVED_LOCK );
assert( p->eLock!=PENDING_LOCK );
switch( p->eState ){
case PAGER_OPEN:
assert( !MEMDB );
assert( pPager->errCode==SQLITE_OK );
assert( sqlite3PcacheRefCount(pPager->pPCache)==0 || pPager->tempFile );
break;
case PAGER_READER:
assert( pPager->errCode==SQLITE_OK );
assert( p->eLock!=UNKNOWN_LOCK );
assert( p->eLock>=SHARED_LOCK );
break;
case PAGER_WRITER_LOCKED:
assert( p->eLock!=UNKNOWN_LOCK );
assert( pPager->errCode==SQLITE_OK );
if( !pagerUseWal(pPager) ){
assert( p->eLock>=RESERVED_LOCK );
}
assert( pPager->dbSize==pPager->dbOrigSize );
assert( pPager->dbOrigSize==pPager->dbFileSize );
assert( pPager->dbOrigSize==pPager->dbHintSize );
assert( pPager->setSuper==0 );
break;
case PAGER_WRITER_CACHEMOD:
assert( p->eLock!=UNKNOWN_LOCK );
assert( pPager->errCode==SQLITE_OK );
if( !pagerUseWal(pPager) ){
/* It is possible that if journal_mode=wal here that neither the
** journal file nor the WAL file are open. This happens during
** a rollback transaction that switches from journal_mode=off
** to journal_mode=wal.
*/
assert( p->eLock>=RESERVED_LOCK );
assert( isOpen(p->jfd)
|| p->journalMode==PAGER_JOURNALMODE_OFF
|| p->journalMode==PAGER_JOURNALMODE_WAL
);
}
assert( pPager->dbOrigSize==pPager->dbFileSize );
assert( pPager->dbOrigSize==pPager->dbHintSize );
break;
case PAGER_WRITER_DBMOD:
assert( p->eLock==EXCLUSIVE_LOCK );
assert( pPager->errCode==SQLITE_OK );
assert( !pagerUseWal(pPager) );
assert( p->eLock>=EXCLUSIVE_LOCK );
assert( isOpen(p->jfd)
|| p->journalMode==PAGER_JOURNALMODE_OFF
|| p->journalMode==PAGER_JOURNALMODE_WAL
|| (sqlite3OsDeviceCharacteristics(p->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
);
assert( pPager->dbOrigSize<=pPager->dbHintSize );
break;
case PAGER_WRITER_FINISHED:
assert( p->eLock==EXCLUSIVE_LOCK );
assert( pPager->errCode==SQLITE_OK );
assert( !pagerUseWal(pPager) );
assert( isOpen(p->jfd)
|| p->journalMode==PAGER_JOURNALMODE_OFF
|| p->journalMode==PAGER_JOURNALMODE_WAL
|| (sqlite3OsDeviceCharacteristics(p->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
);
break;
case PAGER_ERROR:
/* There must be at least one outstanding reference to the pager if
** in ERROR state. Otherwise the pager should have already dropped
** back to OPEN state.
*/
assert( pPager->errCode!=SQLITE_OK );
assert( sqlite3PcacheRefCount(pPager->pPCache)>0 || pPager->tempFile );
break;
}
return 1;
}
#endif /* ifndef NDEBUG */
#ifdef SQLITE_DEBUG
/*
** Return a pointer to a human readable string in a static buffer
** containing the state of the Pager object passed as an argument. This
** is intended to be used within debuggers. For example, as an alternative
** to "print *pPager" in gdb:
**
** (gdb) printf "%s", print_pager_state(pPager)
**
** This routine has external linkage in order to suppress compiler warnings
** about an unused function. It is enclosed within SQLITE_DEBUG and so does
** not appear in normal builds.
*/
char *print_pager_state(Pager *p){
static char zRet[1024];
sqlite3_snprintf(1024, zRet,
"Filename: %s\n"
"State: %s errCode=%d\n"
"Lock: %s\n"
"Locking mode: locking_mode=%s\n"
"Journal mode: journal_mode=%s\n"
"Backing store: tempFile=%d memDb=%d useJournal=%d\n"
"Journal: journalOff=%lld journalHdr=%lld\n"
"Size: dbsize=%d dbOrigSize=%d dbFileSize=%d\n"
, p->zFilename
, p->eState==PAGER_OPEN ? "OPEN" :
p->eState==PAGER_READER ? "READER" :
p->eState==PAGER_WRITER_LOCKED ? "WRITER_LOCKED" :
p->eState==PAGER_WRITER_CACHEMOD ? "WRITER_CACHEMOD" :
p->eState==PAGER_WRITER_DBMOD ? "WRITER_DBMOD" :
p->eState==PAGER_WRITER_FINISHED ? "WRITER_FINISHED" :
p->eState==PAGER_ERROR ? "ERROR" : "?error?"
, (int)p->errCode
, p->eLock==NO_LOCK ? "NO_LOCK" :
p->eLock==RESERVED_LOCK ? "RESERVED" :
p->eLock==EXCLUSIVE_LOCK ? "EXCLUSIVE" :
p->eLock==SHARED_LOCK ? "SHARED" :
p->eLock==UNKNOWN_LOCK ? "UNKNOWN" : "?error?"
, p->exclusiveMode ? "exclusive" : "normal"
, p->journalMode==PAGER_JOURNALMODE_MEMORY ? "memory" :
p->journalMode==PAGER_JOURNALMODE_OFF ? "off" :
p->journalMode==PAGER_JOURNALMODE_DELETE ? "delete" :
p->journalMode==PAGER_JOURNALMODE_PERSIST ? "persist" :
p->journalMode==PAGER_JOURNALMODE_TRUNCATE ? "truncate" :
p->journalMode==PAGER_JOURNALMODE_WAL ? "wal" : "?error?"
, (int)p->tempFile, (int)p->memDb, (int)p->useJournal
, p->journalOff, p->journalHdr
, (int)p->dbSize, (int)p->dbOrigSize, (int)p->dbFileSize
);
return zRet;
}
#endif
/* Forward references to the various page getters */
static int getPageNormal(Pager*,Pgno,DbPage**,int);
static int getPageError(Pager*,Pgno,DbPage**,int);
#if SQLITE_MAX_MMAP_SIZE>0
static int getPageMMap(Pager*,Pgno,DbPage**,int);
#endif
/*
** Set the Pager.xGet method for the appropriate routine used to fetch
** content from the pager.
*/
static void setGetterMethod(Pager *pPager){
if( pPager->errCode ){
pPager->xGet = getPageError;
#if SQLITE_MAX_MMAP_SIZE>0
}else if( USEFETCH(pPager) ){
pPager->xGet = getPageMMap;
#endif /* SQLITE_MAX_MMAP_SIZE>0 */
}else{
pPager->xGet = getPageNormal;
}
}
/*
** Return true if it is necessary to write page *pPg into the sub-journal.
** A page needs to be written into the sub-journal if there exists one
** or more open savepoints for which:
**
** * The page-number is less than or equal to PagerSavepoint.nOrig, and
** * The bit corresponding to the page-number is not set in
** PagerSavepoint.pInSavepoint.
*/
static int subjRequiresPage(PgHdr *pPg){
Pager *pPager = pPg->pPager;
PagerSavepoint *p;
Pgno pgno = pPg->pgno;
int i;
for(i=0; i<pPager->nSavepoint; i++){
p = &pPager->aSavepoint[i];
if( p->nOrig>=pgno && 0==sqlite3BitvecTestNotNull(p->pInSavepoint, pgno) ){
for(i=i+1; i<pPager->nSavepoint; i++){
pPager->aSavepoint[i].bTruncateOnRelease = 0;
}
return 1;
}
}
return 0;
}
#ifdef SQLITE_DEBUG
/*
** Return true if the page is already in the journal file.
*/
static int pageInJournal(Pager *pPager, PgHdr *pPg){
return sqlite3BitvecTest(pPager->pInJournal, pPg->pgno);
}
#endif
/*
** Read a 32-bit integer from the given file descriptor. Store the integer
** that is read in *pRes. Return SQLITE_OK if everything worked, or an
** error code is something goes wrong.
**
** All values are stored on disk as big-endian.
*/
static int read32bits(sqlite3_file *fd, i64 offset, u32 *pRes){
unsigned char ac[4];
int rc = sqlite3OsRead(fd, ac, sizeof(ac), offset);
if( rc==SQLITE_OK ){
*pRes = sqlite3Get4byte(ac);
}
return rc;
}
/*
** Write a 32-bit integer into a string buffer in big-endian byte order.
*/
#define put32bits(A,B) sqlite3Put4byte((u8*)A,B)
/*
** Write a 32-bit integer into the given file descriptor. Return SQLITE_OK
** on success or an error code is something goes wrong.
*/
static int write32bits(sqlite3_file *fd, i64 offset, u32 val){
char ac[4];
put32bits(ac, val);
return sqlite3OsWrite(fd, ac, 4, offset);
}
/*
** Unlock the database file to level eLock, which must be either NO_LOCK
** or SHARED_LOCK. Regardless of whether or not the call to xUnlock()
** succeeds, set the Pager.eLock variable to match the (attempted) new lock.
**
** Except, if Pager.eLock is set to UNKNOWN_LOCK when this function is
** called, do not modify it. See the comment above the #define of
** UNKNOWN_LOCK for an explanation of this.
*/
static int pagerUnlockDb(Pager *pPager, int eLock){
int rc = SQLITE_OK;
assert( !pPager->exclusiveMode || pPager->eLock==eLock );
assert( eLock==NO_LOCK || eLock==SHARED_LOCK );
assert( eLock!=NO_LOCK || pagerUseWal(pPager)==0 );
if( isOpen(pPager->fd) ){
assert( pPager->eLock>=eLock );
rc = pPager->noLock ? SQLITE_OK : sqlite3OsUnlock(pPager->fd, eLock);
if( pPager->eLock!=UNKNOWN_LOCK ){
pPager->eLock = (u8)eLock;
}
IOTRACE(("UNLOCK %p %d\n", pPager, eLock))
}
pPager->changeCountDone = pPager->tempFile; /* ticket fb3b3024ea238d5c */
return rc;
}
/*
** Lock the database file to level eLock, which must be either SHARED_LOCK,
** RESERVED_LOCK or EXCLUSIVE_LOCK. If the caller is successful, set the
** Pager.eLock variable to the new locking state.
**
** Except, if Pager.eLock is set to UNKNOWN_LOCK when this function is
** called, do not modify it unless the new locking state is EXCLUSIVE_LOCK.
** See the comment above the #define of UNKNOWN_LOCK for an explanation
** of this.
*/
static int pagerLockDb(Pager *pPager, int eLock){
int rc = SQLITE_OK;
assert( eLock==SHARED_LOCK || eLock==RESERVED_LOCK || eLock==EXCLUSIVE_LOCK );
if( pPager->eLock<eLock || pPager->eLock==UNKNOWN_LOCK ){
rc = pPager->noLock ? SQLITE_OK : sqlite3OsLock(pPager->fd, eLock);
if( rc==SQLITE_OK && (pPager->eLock!=UNKNOWN_LOCK||eLock==EXCLUSIVE_LOCK) ){
pPager->eLock = (u8)eLock;
IOTRACE(("LOCK %p %d\n", pPager, eLock))
}
}
return rc;
}
/*
** This function determines whether or not the atomic-write or
** atomic-batch-write optimizations can be used with this pager. The
** atomic-write optimization can be used if:
**
** (a) the value returned by OsDeviceCharacteristics() indicates that
** a database page may be written atomically, and
** (b) the value returned by OsSectorSize() is less than or equal
** to the page size.
**
** If it can be used, then the value returned is the size of the journal
** file when it contains rollback data for exactly one page.
**
** The atomic-batch-write optimization can be used if OsDeviceCharacteristics()
** returns a value with the SQLITE_IOCAP_BATCH_ATOMIC bit set. -1 is
** returned in this case.
**
** If neither optimization can be used, 0 is returned.
*/
static int jrnlBufferSize(Pager *pPager){
assert( !MEMDB );
#if defined(SQLITE_ENABLE_ATOMIC_WRITE) \
|| defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
int dc; /* Device characteristics */
assert( isOpen(pPager->fd) );
dc = sqlite3OsDeviceCharacteristics(pPager->fd);
#else
UNUSED_PARAMETER(pPager);
#endif
#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
if( pPager->dbSize>0 && (dc&SQLITE_IOCAP_BATCH_ATOMIC) ){
return -1;
}
#endif
#ifdef SQLITE_ENABLE_ATOMIC_WRITE
{
int nSector = pPager->sectorSize;
int szPage = pPager->pageSize;
assert(SQLITE_IOCAP_ATOMIC512==(512>>8));
assert(SQLITE_IOCAP_ATOMIC64K==(65536>>8));
if( 0==(dc&(SQLITE_IOCAP_ATOMIC|(szPage>>8)) || nSector>szPage) ){
return 0;
}
}
return JOURNAL_HDR_SZ(pPager) + JOURNAL_PG_SZ(pPager);
#endif
return 0;
}
/*
** If SQLITE_CHECK_PAGES is defined then we do some sanity checking
** on the cache using a hash function. This is used for testing
** and debugging only.
*/
#ifdef SQLITE_CHECK_PAGES
/*
** Return a 32-bit hash of the page data for pPage.
*/
static u32 pager_datahash(int nByte, unsigned char *pData){
u32 hash = 0;
int i;
for(i=0; i<nByte; i++){
hash = (hash*1039) + pData[i];
}
return hash;
}
static u32 pager_pagehash(PgHdr *pPage){
return pager_datahash(pPage->pPager->pageSize, (unsigned char *)pPage->pData);
}
static void pager_set_pagehash(PgHdr *pPage){
pPage->pageHash = pager_pagehash(pPage);
}
/*
** The CHECK_PAGE macro takes a PgHdr* as an argument. If SQLITE_CHECK_PAGES
** is defined, and NDEBUG is not defined, an assert() statement checks
** that the page is either dirty or still matches the calculated page-hash.
*/
#define CHECK_PAGE(x) checkPage(x)
static void checkPage(PgHdr *pPg){
Pager *pPager = pPg->pPager;
assert( pPager->eState!=PAGER_ERROR );
assert( (pPg->flags&PGHDR_DIRTY) || pPg->pageHash==pager_pagehash(pPg) );
}
#else
#define pager_datahash(X,Y) 0
#define pager_pagehash(X) 0
#define pager_set_pagehash(X)
#define CHECK_PAGE(x)
#endif /* SQLITE_CHECK_PAGES */
/*
** When this is called the journal file for pager pPager must be open.
** This function attempts to read a super-journal file name from the
** end of the file and, if successful, copies it into memory supplied
** by the caller. See comments above writeSuperJournal() for the format
** used to store a super-journal file name at the end of a journal file.
**
** zSuper must point to a buffer of at least nSuper bytes allocated by
** the caller. This should be sqlite3_vfs.mxPathname+1 (to ensure there is
** enough space to write the super-journal name). If the super-journal
** name in the journal is longer than nSuper bytes (including a
** nul-terminator), then this is handled as if no super-journal name
** were present in the journal.
**
** If a super-journal file name is present at the end of the journal
** file, then it is copied into the buffer pointed to by zSuper. A
** nul-terminator byte is appended to the buffer following the
** super-journal file name.
**
** If it is determined that no super-journal file name is present
** zSuper[0] is set to 0 and SQLITE_OK returned.
**
** If an error occurs while reading from the journal file, an SQLite
** error code is returned.
*/
static int readSuperJournal(sqlite3_file *pJrnl, char *zSuper, u32 nSuper){
int rc; /* Return code */
u32 len; /* Length in bytes of super-journal name */
i64 szJ; /* Total size in bytes of journal file pJrnl */
u32 cksum; /* MJ checksum value read from journal */
u32 u; /* Unsigned loop counter */
unsigned char aMagic[8]; /* A buffer to hold the magic header */
zSuper[0] = '\0';
if( SQLITE_OK!=(rc = sqlite3OsFileSize(pJrnl, &szJ))
|| szJ<16
|| SQLITE_OK!=(rc = read32bits(pJrnl, szJ-16, &len))
|| len>=nSuper
|| len>szJ-16
|| len==0
|| SQLITE_OK!=(rc = read32bits(pJrnl, szJ-12, &cksum))
|| SQLITE_OK!=(rc = sqlite3OsRead(pJrnl, aMagic, 8, szJ-8))
|| memcmp(aMagic, aJournalMagic, 8)
|| SQLITE_OK!=(rc = sqlite3OsRead(pJrnl, zSuper, len, szJ-16-len))
){
return rc;
}
/* See if the checksum matches the super-journal name */
for(u=0; u<len; u++){
cksum -= zSuper[u];
}
if( cksum ){
/* If the checksum doesn't add up, then one or more of the disk sectors
** containing the super-journal filename is corrupted. This means
** definitely roll back, so just return SQLITE_OK and report a (nul)
** super-journal filename.
*/
len = 0;
}
zSuper[len] = '\0';
zSuper[len+1] = '\0';
return SQLITE_OK;
}
/*
** Return the offset of the sector boundary at or immediately
** following the value in pPager->journalOff, assuming a sector
** size of pPager->sectorSize bytes.
**
** i.e for a sector size of 512:
**
** Pager.journalOff Return value
** ---------------------------------------
** 0 0
** 512 512
** 100 512
** 2000 2048
**
*/
static i64 journalHdrOffset(Pager *pPager){
i64 offset = 0;
i64 c = pPager->journalOff;
if( c ){
offset = ((c-1)/JOURNAL_HDR_SZ(pPager) + 1) * JOURNAL_HDR_SZ(pPager);
}
assert( offset%JOURNAL_HDR_SZ(pPager)==0 );
assert( offset>=c );
assert( (offset-c)<JOURNAL_HDR_SZ(pPager) );
return offset;
}
/*
** The journal file must be open when this function is called.
**
** This function is a no-op if the journal file has not been written to
** within the current transaction (i.e. if Pager.journalOff==0).
**
** If doTruncate is non-zero or the Pager.journalSizeLimit variable is
** set to 0, then truncate the journal file to zero bytes in size. Otherwise,
** zero the 28-byte header at the start of the journal file. In either case,
** if the pager is not in no-sync mode, sync the journal file immediately
** after writing or truncating it.
**
** If Pager.journalSizeLimit is set to a positive, non-zero value, and
** following the truncation or zeroing described above the size of the
** journal file in bytes is larger than this value, then truncate the
** journal file to Pager.journalSizeLimit bytes. The journal file does
** not need to be synced following this operation.
**
** If an IO error occurs, abandon processing and return the IO error code.
** Otherwise, return SQLITE_OK.
*/
static int zeroJournalHdr(Pager *pPager, int doTruncate){
int rc = SQLITE_OK; /* Return code */
assert( isOpen(pPager->jfd) );
assert( !sqlite3JournalIsInMemory(pPager->jfd) );
if( pPager->journalOff ){
const i64 iLimit = pPager->journalSizeLimit; /* Local cache of jsl */
IOTRACE(("JZEROHDR %p\n", pPager))
if( doTruncate || iLimit==0 ){
rc = sqlite3OsTruncate(pPager->jfd, 0);
}else{
static const char zeroHdr[28] = {0};
rc = sqlite3OsWrite(pPager->jfd, zeroHdr, sizeof(zeroHdr), 0);
}
if( rc==SQLITE_OK && !pPager->noSync ){
rc = sqlite3OsSync(pPager->jfd, SQLITE_SYNC_DATAONLY|pPager->syncFlags);
}
/* At this point the transaction is committed but the write lock
** is still held on the file. If there is a size limit configured for
** the persistent journal and the journal file currently consumes more
** space than that limit allows for, truncate it now. There is no need
** to sync the file following this operation.
*/
if( rc==SQLITE_OK && iLimit>0 ){
i64 sz;
rc = sqlite3OsFileSize(pPager->jfd, &sz);
if( rc==SQLITE_OK && sz>iLimit ){
rc = sqlite3OsTruncate(pPager->jfd, iLimit);
}
}
}
return rc;
}
/*
** The journal file must be open when this routine is called. A journal
** header (JOURNAL_HDR_SZ bytes) is written into the journal file at the
** current location.
**
** The format for the journal header is as follows:
** - 8 bytes: Magic identifying journal format.
** - 4 bytes: Number of records in journal, or -1 no-sync mode is on.
** - 4 bytes: Random number used for page hash.
** - 4 bytes: Initial database page count.
** - 4 bytes: Sector size used by the process that wrote this journal.
** - 4 bytes: Database page size.
**
** Followed by (JOURNAL_HDR_SZ - 28) bytes of unused space.
*/
static int writeJournalHdr(Pager *pPager){
int rc = SQLITE_OK; /* Return code */
char *zHeader = pPager->pTmpSpace; /* Temporary space used to build header */
u32 nHeader = (u32)pPager->pageSize;/* Size of buffer pointed to by zHeader */
u32 nWrite; /* Bytes of header sector written */
int ii; /* Loop counter */
assert( isOpen(pPager->jfd) ); /* Journal file must be open. */
if( nHeader>JOURNAL_HDR_SZ(pPager) ){
nHeader = JOURNAL_HDR_SZ(pPager);
}
/* If there are active savepoints and any of them were created
** since the most recent journal header was written, update the
** PagerSavepoint.iHdrOffset fields now.
*/
for(ii=0; ii<pPager->nSavepoint; ii++){
if( pPager->aSavepoint[ii].iHdrOffset==0 ){
pPager->aSavepoint[ii].iHdrOffset = pPager->journalOff;
}
}
pPager->journalHdr = pPager->journalOff = journalHdrOffset(pPager);
/*
** Write the nRec Field - the number of page records that follow this
** journal header. Normally, zero is written to this value at this time.
** After the records are added to the journal (and the journal synced,
** if in full-sync mode), the zero is overwritten with the true number
** of records (see syncJournal()).
**
** A faster alternative is to write 0xFFFFFFFF to the nRec field. When
** reading the journal this value tells SQLite to assume that the
** rest of the journal file contains valid page records. This assumption
** is dangerous, as if a failure occurred whilst writing to the journal
** file it may contain some garbage data. There are two scenarios
** where this risk can be ignored:
**
** * When the pager is in no-sync mode. Corruption can follow a
** power failure in this case anyway.
**
** * When the SQLITE_IOCAP_SAFE_APPEND flag is set. This guarantees
** that garbage data is never appended to the journal file.
*/
assert( isOpen(pPager->fd) || pPager->noSync );
if( pPager->noSync || (pPager->journalMode==PAGER_JOURNALMODE_MEMORY)
|| (sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_SAFE_APPEND)
){
memcpy(zHeader, aJournalMagic, sizeof(aJournalMagic));
put32bits(&zHeader[sizeof(aJournalMagic)], 0xffffffff);
}else{
memset(zHeader, 0, sizeof(aJournalMagic)+4);
}
/* The random check-hash initializer */
sqlite3_randomness(sizeof(pPager->cksumInit), &pPager->cksumInit);
put32bits(&zHeader[sizeof(aJournalMagic)+4], pPager->cksumInit);
/* The initial database size */
put32bits(&zHeader[sizeof(aJournalMagic)+8], pPager->dbOrigSize);
/* The assumed sector size for this process */
put32bits(&zHeader[sizeof(aJournalMagic)+12], pPager->sectorSize);
/* The page size */
put32bits(&zHeader[sizeof(aJournalMagic)+16], pPager->pageSize);
/* Initializing the tail of the buffer is not necessary. Everything
** works find if the following memset() is omitted. But initializing
** the memory prevents valgrind from complaining, so we are willing to
** take the performance hit.
*/
memset(&zHeader[sizeof(aJournalMagic)+20], 0,
nHeader-(sizeof(aJournalMagic)+20));
/* In theory, it is only necessary to write the 28 bytes that the
** journal header consumes to the journal file here. Then increment the
** Pager.journalOff variable by JOURNAL_HDR_SZ so that the next
** record is written to the following sector (leaving a gap in the file
** that will be implicitly filled in by the OS).
**
** However it has been discovered that on some systems this pattern can
** be significantly slower than contiguously writing data to the file,
** even if that means explicitly writing data to the block of
** (JOURNAL_HDR_SZ - 28) bytes that will not be used. So that is what
** is done.
**
** The loop is required here in case the sector-size is larger than the
** database page size. Since the zHeader buffer is only Pager.pageSize
** bytes in size, more than one call to sqlite3OsWrite() may be required
** to populate the entire journal header sector.
*/
for(nWrite=0; rc==SQLITE_OK&&nWrite<JOURNAL_HDR_SZ(pPager); nWrite+=nHeader){
IOTRACE(("JHDR %p %lld %d\n", pPager, pPager->journalHdr, nHeader))
rc = sqlite3OsWrite(pPager->jfd, zHeader, nHeader, pPager->journalOff);
assert( pPager->journalHdr <= pPager->journalOff );
pPager->journalOff += nHeader;
}
return rc;
}
/*
** The journal file must be open when this is called. A journal header file
** (JOURNAL_HDR_SZ bytes) is read from the current location in the journal
** file. The current location in the journal file is given by
** pPager->journalOff. See comments above function writeJournalHdr() for
** a description of the journal header format.
**
** If the header is read successfully, *pNRec is set to the number of
** page records following this header and *pDbSize is set to the size of the
** database before the transaction began, in pages. Also, pPager->cksumInit
** is set to the value read from the journal header. SQLITE_OK is returned
** in this case.
**
** If the journal header file appears to be corrupted, SQLITE_DONE is
** returned and *pNRec and *PDbSize are undefined. If JOURNAL_HDR_SZ bytes
** cannot be read from the journal file an error code is returned.
*/
static int readJournalHdr(
Pager *pPager, /* Pager object */
int isHot,
i64 journalSize, /* Size of the open journal file in bytes */
u32 *pNRec, /* OUT: Value read from the nRec field */
u32 *pDbSize /* OUT: Value of original database size field */
){
int rc; /* Return code */
unsigned char aMagic[8]; /* A buffer to hold the magic header */
i64 iHdrOff; /* Offset of journal header being read */
assert( isOpen(pPager->jfd) ); /* Journal file must be open. */
/* Advance Pager.journalOff to the start of the next sector. If the
** journal file is too small for there to be a header stored at this
** point, return SQLITE_DONE.
*/
pPager->journalOff = journalHdrOffset(pPager);
if( pPager->journalOff+JOURNAL_HDR_SZ(pPager) > journalSize ){
return SQLITE_DONE;
}
iHdrOff = pPager->journalOff;
/* Read in the first 8 bytes of the journal header. If they do not match
** the magic string found at the start of each journal header, return
** SQLITE_DONE. If an IO error occurs, return an error code. Otherwise,
** proceed.
*/
if( isHot || iHdrOff!=pPager->journalHdr ){
rc = sqlite3OsRead(pPager->jfd, aMagic, sizeof(aMagic), iHdrOff);
if( rc ){
return rc;
}
if( memcmp(aMagic, aJournalMagic, sizeof(aMagic))!=0 ){
return SQLITE_DONE;
}
}
/* Read the first three 32-bit fields of the journal header: The nRec
** field, the checksum-initializer and the database size at the start
** of the transaction. Return an error code if anything goes wrong.
*/
if( SQLITE_OK!=(rc = read32bits(pPager->jfd, iHdrOff+8, pNRec))
|| SQLITE_OK!=(rc = read32bits(pPager->jfd, iHdrOff+12, &pPager->cksumInit))
|| SQLITE_OK!=(rc = read32bits(pPager->jfd, iHdrOff+16, pDbSize))
){
return rc;
}
if( pPager->journalOff==0 ){
u32 iPageSize; /* Page-size field of journal header */
u32 iSectorSize; /* Sector-size field of journal header */
/* Read the page-size and sector-size journal header fields. */
if( SQLITE_OK!=(rc = read32bits(pPager->jfd, iHdrOff+20, &iSectorSize))
|| SQLITE_OK!=(rc = read32bits(pPager->jfd, iHdrOff+24, &iPageSize))
){
return rc;
}
/* Versions of SQLite prior to 3.5.8 set the page-size field of the
** journal header to zero. In this case, assume that the Pager.pageSize
** variable is already set to the correct page size.
*/
if( iPageSize==0 ){
iPageSize = pPager->pageSize;
}
/* Check that the values read from the page-size and sector-size fields
** are within range. To be 'in range', both values need to be a power
** of two greater than or equal to 512 or 32, and not greater than their
** respective compile time maximum limits.
*/
if( iPageSize<512 || iSectorSize<32
|| iPageSize>SQLITE_MAX_PAGE_SIZE || iSectorSize>MAX_SECTOR_SIZE
|| ((iPageSize-1)&iPageSize)!=0 || ((iSectorSize-1)&iSectorSize)!=0
){
/* If the either the page-size or sector-size in the journal-header is
** invalid, then the process that wrote the journal-header must have
** crashed before the header was synced. In this case stop reading
** the journal file here.
*/
return SQLITE_DONE;
}
/* Update the page-size to match the value read from the journal.
** Use a testcase() macro to make sure that malloc failure within
** PagerSetPagesize() is tested.
*/
rc = sqlite3PagerSetPagesize(pPager, &iPageSize, -1);
testcase( rc!=SQLITE_OK );
/* Update the assumed sector-size to match the value used by
** the process that created this journal. If this journal was
** created by a process other than this one, then this routine
** is being called from within pager_playback(). The local value
** of Pager.sectorSize is restored at the end of that routine.
*/
pPager->sectorSize = iSectorSize;
}
pPager->journalOff += JOURNAL_HDR_SZ(pPager);
return rc;
}
/*
** Write the supplied super-journal name into the journal file for pager
** pPager at the current location. The super-journal name must be the last
** thing written to a journal file. If the pager is in full-sync mode, the
** journal file descriptor is advanced to the next sector boundary before
** anything is written. The format is:
**
** + 4 bytes: PAGER_SJ_PGNO.
** + N bytes: super-journal filename in utf-8.
** + 4 bytes: N (length of super-journal name in bytes, no nul-terminator).
** + 4 bytes: super-journal name checksum.
** + 8 bytes: aJournalMagic[].
**
** The super-journal page checksum is the sum of the bytes in thesuper-journal
** name, where each byte is interpreted as a signed 8-bit integer.
**
** If zSuper is a NULL pointer (occurs for a single database transaction),
** this call is a no-op.
*/
static int writeSuperJournal(Pager *pPager, const char *zSuper){
int rc; /* Return code */
int nSuper; /* Length of string zSuper */
i64 iHdrOff; /* Offset of header in journal file */
i64 jrnlSize; /* Size of journal file on disk */
u32 cksum = 0; /* Checksum of string zSuper */
assert( pPager->setSuper==0 );
assert( !pagerUseWal(pPager) );
if( !zSuper
|| pPager->journalMode==PAGER_JOURNALMODE_MEMORY
|| !isOpen(pPager->jfd)
){
return SQLITE_OK;
}
pPager->setSuper = 1;
assert( pPager->journalHdr <= pPager->journalOff );
/* Calculate the length in bytes and the checksum of zSuper */
for(nSuper=0; zSuper[nSuper]; nSuper++){
cksum += zSuper[nSuper];
}
/* If in full-sync mode, advance to the next disk sector before writing
** the super-journal name. This is in case the previous page written to
** the journal has already been synced.
*/
if( pPager->fullSync ){
pPager->journalOff = journalHdrOffset(pPager);
}
iHdrOff = pPager->journalOff;
/* Write the super-journal data to the end of the journal file. If
** an error occurs, return the error code to the caller.
*/
if( (0 != (rc = write32bits(pPager->jfd, iHdrOff, PAGER_SJ_PGNO(pPager))))
|| (0 != (rc = sqlite3OsWrite(pPager->jfd, zSuper, nSuper, iHdrOff+4)))
|| (0 != (rc = write32bits(pPager->jfd, iHdrOff+4+nSuper, nSuper)))
|| (0 != (rc = write32bits(pPager->jfd, iHdrOff+4+nSuper+4, cksum)))
|| (0 != (rc = sqlite3OsWrite(pPager->jfd, aJournalMagic, 8,
iHdrOff+4+nSuper+8)))
){
return rc;
}
pPager->journalOff += (nSuper+20);
/* If the pager is in peristent-journal mode, then the physical
** journal-file may extend past the end of the super-journal name
** and 8 bytes of magic data just written to the file. This is
** dangerous because the code to rollback a hot-journal file
** will not be able to find the super-journal name to determine
** whether or not the journal is hot.
**
** Easiest thing to do in this scenario is to truncate the journal
** file to the required size.
*/
if( SQLITE_OK==(rc = sqlite3OsFileSize(pPager->jfd, &jrnlSize))
&& jrnlSize>pPager->journalOff
){
rc = sqlite3OsTruncate(pPager->jfd, pPager->journalOff);
}
return rc;
}
/*
** Discard the entire contents of the in-memory page-cache.
*/
static void pager_reset(Pager *pPager){
pPager->iDataVersion++;
sqlite3BackupRestart(pPager->pBackup);
sqlite3PcacheClear(pPager->pPCache);
}
/*
** Return the pPager->iDataVersion value
*/
u32 sqlite3PagerDataVersion(Pager *pPager){
return pPager->iDataVersion;
}
/*
** Free all structures in the Pager.aSavepoint[] array and set both
** Pager.aSavepoint and Pager.nSavepoint to zero. Close the sub-journal
** if it is open and the pager is not in exclusive mode.
*/
static void releaseAllSavepoints(Pager *pPager){
int ii; /* Iterator for looping through Pager.aSavepoint */
for(ii=0; ii<pPager->nSavepoint; ii++){
sqlite3BitvecDestroy(pPager->aSavepoint[ii].pInSavepoint);
}
if( !pPager->exclusiveMode || sqlite3JournalIsInMemory(pPager->sjfd) ){
sqlite3OsClose(pPager->sjfd);
}
sqlite3_free(pPager->aSavepoint);
pPager->aSavepoint = 0;
pPager->nSavepoint = 0;
pPager->nSubRec = 0;
}
/*
** Set the bit number pgno in the PagerSavepoint.pInSavepoint
** bitvecs of all open savepoints. Return SQLITE_OK if successful
** or SQLITE_NOMEM if a malloc failure occurs.
*/
static int addToSavepointBitvecs(Pager *pPager, Pgno pgno){
int ii; /* Loop counter */
int rc = SQLITE_OK; /* Result code */
for(ii=0; ii<pPager->nSavepoint; ii++){
PagerSavepoint *p = &pPager->aSavepoint[ii];
if( pgno<=p->nOrig ){
rc |= sqlite3BitvecSet(p->pInSavepoint, pgno);
testcase( rc==SQLITE_NOMEM );
assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
}
}
return rc;
}
/*
** This function is a no-op if the pager is in exclusive mode and not
** in the ERROR state. Otherwise, it switches the pager to PAGER_OPEN
** state.
**
** If the pager is not in exclusive-access mode, the database file is
** completely unlocked. If the file is unlocked and the file-system does
** not exhibit the UNDELETABLE_WHEN_OPEN property, the journal file is
** closed (if it is open).
**
** If the pager is in ERROR state when this function is called, the
** contents of the pager cache are discarded before switching back to
** the OPEN state. Regardless of whether the pager is in exclusive-mode
** or not, any journal file left in the file-system will be treated
** as a hot-journal and rolled back the next time a read-transaction
** is opened (by this or by any other connection).
*/
static void pager_unlock(Pager *pPager){
assert( pPager->eState==PAGER_READER
|| pPager->eState==PAGER_OPEN
|| pPager->eState==PAGER_ERROR
);
sqlite3BitvecDestroy(pPager->pInJournal);
pPager->pInJournal = 0;
releaseAllSavepoints(pPager);
if( pagerUseWal(pPager) ){
assert( !isOpen(pPager->jfd) );
sqlite3WalEndReadTransaction(pPager->pWal);
pPager->eState = PAGER_OPEN;
}else if( !pPager->exclusiveMode ){
int rc; /* Error code returned by pagerUnlockDb() */
int iDc = isOpen(pPager->fd)?sqlite3OsDeviceCharacteristics(pPager->fd):0;
/* If the operating system support deletion of open files, then
** close the journal file when dropping the database lock. Otherwise
** another connection with journal_mode=delete might delete the file
** out from under us.
*/
assert( (PAGER_JOURNALMODE_MEMORY & 5)!=1 );
assert( (PAGER_JOURNALMODE_OFF & 5)!=1 );
assert( (PAGER_JOURNALMODE_WAL & 5)!=1 );
assert( (PAGER_JOURNALMODE_DELETE & 5)!=1 );
assert( (PAGER_JOURNALMODE_TRUNCATE & 5)==1 );
assert( (PAGER_JOURNALMODE_PERSIST & 5)==1 );
if( 0==(iDc & SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN)
|| 1!=(pPager->journalMode & 5)
){
sqlite3OsClose(pPager->jfd);
}
/* If the pager is in the ERROR state and the call to unlock the database
** file fails, set the current lock to UNKNOWN_LOCK. See the comment
** above the #define for UNKNOWN_LOCK for an explanation of why this
** is necessary.
*/
rc = pagerUnlockDb(pPager, NO_LOCK);
if( rc!=SQLITE_OK && pPager->eState==PAGER_ERROR ){
pPager->eLock = UNKNOWN_LOCK;
}
/* The pager state may be changed from PAGER_ERROR to PAGER_OPEN here
** without clearing the error code. This is intentional - the error
** code is cleared and the cache reset in the block below.
*/
assert( pPager->errCode || pPager->eState!=PAGER_ERROR );
pPager->eState = PAGER_OPEN;
}
/* If Pager.errCode is set, the contents of the pager cache cannot be
** trusted. Now that there are no outstanding references to the pager,
** it can safely move back to PAGER_OPEN state. This happens in both
** normal and exclusive-locking mode.
*/
assert( pPager->errCode==SQLITE_OK || !MEMDB );
if( pPager->errCode ){
if( pPager->tempFile==0 ){
pager_reset(pPager);
pPager->changeCountDone = 0;
pPager->eState = PAGER_OPEN;
}else{
pPager->eState = (isOpen(pPager->jfd) ? PAGER_OPEN : PAGER_READER);
}
if( USEFETCH(pPager) ) sqlite3OsUnfetch(pPager->fd, 0, 0);
pPager->errCode = SQLITE_OK;
setGetterMethod(pPager);
}
pPager->journalOff = 0;
pPager->journalHdr = 0;
pPager->setSuper = 0;
}
/*
** This function is called whenever an IOERR or FULL error that requires
** the pager to transition into the ERROR state may ahve occurred.
** The first argument is a pointer to the pager structure, the second
** the error-code about to be returned by a pager API function. The
** value returned is a copy of the second argument to this function.
**
** If the second argument is SQLITE_FULL, SQLITE_IOERR or one of the
** IOERR sub-codes, the pager enters the ERROR state and the error code
** is stored in Pager.errCode. While the pager remains in the ERROR state,
** all major API calls on the Pager will immediately return Pager.errCode.
**
** The ERROR state indicates that the contents of the pager-cache
** cannot be trusted. This state can be cleared by completely discarding
** the contents of the pager-cache. If a transaction was active when
** the persistent error occurred, then the rollback journal may need
** to be replayed to restore the contents of the database file (as if
** it were a hot-journal).
*/
static int pager_error(Pager *pPager, int rc){
int rc2 = rc & 0xff;
assert( rc==SQLITE_OK || !MEMDB );
assert(
pPager->errCode==SQLITE_FULL ||
pPager->errCode==SQLITE_OK ||
(pPager->errCode & 0xff)==SQLITE_IOERR
);
if( rc2==SQLITE_FULL || rc2==SQLITE_IOERR ){
pPager->errCode = rc;
pPager->eState = PAGER_ERROR;
setGetterMethod(pPager);
}
return rc;
}
static int pager_truncate(Pager *pPager, Pgno nPage);
/*
** The write transaction open on pPager is being committed (bCommit==1)
** or rolled back (bCommit==0).
**
** Return TRUE if and only if all dirty pages should be flushed to disk.
**
** Rules:
**
** * For non-TEMP databases, always sync to disk. This is necessary
** for transactions to be durable.
**
** * Sync TEMP database only on a COMMIT (not a ROLLBACK) when the backing
** file has been created already (via a spill on pagerStress()) and
** when the number of dirty pages in memory exceeds 25% of the total
** cache size.
*/
static int pagerFlushOnCommit(Pager *pPager, int bCommit){
if( pPager->tempFile==0 ) return 1;
if( !bCommit ) return 0;
if( !isOpen(pPager->fd) ) return 0;
return (sqlite3PCachePercentDirty(pPager->pPCache)>=25);
}
/*
** This routine ends a transaction. A transaction is usually ended by
** either a COMMIT or a ROLLBACK operation. This routine may be called
** after rollback of a hot-journal, or if an error occurs while opening
** the journal file or writing the very first journal-header of a
** database transaction.
**
** This routine is never called in PAGER_ERROR state. If it is called
** in PAGER_NONE or PAGER_SHARED state and the lock held is less
** exclusive than a RESERVED lock, it is a no-op.
**
** Otherwise, any active savepoints are released.
**
** If the journal file is open, then it is "finalized". Once a journal
** file has been finalized it is not possible to use it to roll back a
** transaction. Nor will it be considered to be a hot-journal by this
** or any other database connection. Exactly how a journal is finalized
** depends on whether or not the pager is running in exclusive mode and
** the current journal-mode (Pager.journalMode value), as follows:
**
** journalMode==MEMORY
** Journal file descriptor is simply closed. This destroys an
** in-memory journal.
**
** journalMode==TRUNCATE
** Journal file is truncated to zero bytes in size.
**
** journalMode==PERSIST
** The first 28 bytes of the journal file are zeroed. This invalidates
** the first journal header in the file, and hence the entire journal
** file. An invalid journal file cannot be rolled back.
**
** journalMode==DELETE
** The journal file is closed and deleted using sqlite3OsDelete().
**
** If the pager is running in exclusive mode, this method of finalizing
** the journal file is never used. Instead, if the journalMode is
** DELETE and the pager is in exclusive mode, the method described under
** journalMode==PERSIST is used instead.
**
** After the journal is finalized, the pager moves to PAGER_READER state.
** If running in non-exclusive rollback mode, the lock on the file is
** downgraded to a SHARED_LOCK.
**
** SQLITE_OK is returned if no error occurs. If an error occurs during
** any of the IO operations to finalize the journal file or unlock the
** database then the IO error code is returned to the user. If the
** operation to finalize the journal file fails, then the code still
** tries to unlock the database file if not in exclusive mode. If the
** unlock operation fails as well, then the first error code related
** to the first error encountered (the journal finalization one) is
** returned.
*/
static int pager_end_transaction(Pager *pPager, int hasSuper, int bCommit){
int rc = SQLITE_OK; /* Error code from journal finalization operation */
int rc2 = SQLITE_OK; /* Error code from db file unlock operation */
/* Do nothing if the pager does not have an open write transaction
** or at least a RESERVED lock. This function may be called when there
** is no write-transaction active but a RESERVED or greater lock is
** held under two circumstances:
**
** 1. After a successful hot-journal rollback, it is called with
** eState==PAGER_NONE and eLock==EXCLUSIVE_LOCK.
**
** 2. If a connection with locking_mode=exclusive holding an EXCLUSIVE
** lock switches back to locking_mode=normal and then executes a
** read-transaction, this function is called with eState==PAGER_READER
** and eLock==EXCLUSIVE_LOCK when the read-transaction is closed.
*/
assert( assert_pager_state(pPager) );
assert( pPager->eState!=PAGER_ERROR );
if( pPager->eState<PAGER_WRITER_LOCKED && pPager->eLock<RESERVED_LOCK ){
return SQLITE_OK;
}
releaseAllSavepoints(pPager);
assert( isOpen(pPager->jfd) || pPager->pInJournal==0
|| (sqlite3OsDeviceCharacteristics(pPager->fd)&SQLITE_IOCAP_BATCH_ATOMIC)
);
if( isOpen(pPager->jfd) ){
assert( !pagerUseWal(pPager) );
/* Finalize the journal file. */
if( sqlite3JournalIsInMemory(pPager->jfd) ){
/* assert( pPager->journalMode==PAGER_JOURNALMODE_MEMORY ); */
sqlite3OsClose(pPager->jfd);
}else if( pPager->journalMode==PAGER_JOURNALMODE_TRUNCATE ){
if( pPager->journalOff==0 ){
rc = SQLITE_OK;
}else{
rc = sqlite3OsTruncate(pPager->jfd, 0);
if( rc==SQLITE_OK && pPager->fullSync ){
/* Make sure the new file size is written into the inode right away.
** Otherwise the journal might resurrect following a power loss and
** cause the last transaction to roll back. See
** https://bugzilla.mozilla.org/show_bug.cgi?id=1072773
*/
rc = sqlite3OsSync(pPager->jfd, pPager->syncFlags);
}
}
pPager->journalOff = 0;
}else if( pPager->journalMode==PAGER_JOURNALMODE_PERSIST
|| (pPager->exclusiveMode && pPager->journalMode!=PAGER_JOURNALMODE_WAL)
){
rc = zeroJournalHdr(pPager, hasSuper||pPager->tempFile);
pPager->journalOff = 0;
}else{
/* This branch may be executed with Pager.journalMode==MEMORY if
** a hot-journal was just rolled back. In this case the journal
** file should be closed and deleted. If this connection writes to
** the database file, it will do so using an in-memory journal.
*/
int bDelete = !pPager->tempFile;
assert( sqlite3JournalIsInMemory(pPager->jfd)==0 );
assert( pPager->journalMode==PAGER_JOURNALMODE_DELETE
|| pPager->journalMode==PAGER_JOURNALMODE_MEMORY
|| pPager->journalMode==PAGER_JOURNALMODE_WAL
);
sqlite3OsClose(pPager->jfd);
if( bDelete ){
rc = sqlite3OsDelete(pPager->pVfs, pPager->zJournal, pPager->extraSync);
}
}
}
#ifdef SQLITE_CHECK_PAGES
sqlite3PcacheIterateDirty(pPager->pPCache, pager_set_pagehash);
if( pPager->dbSize==0 && sqlite3PcacheRefCount(pPager->pPCache)>0 ){
PgHdr *p = sqlite3PagerLookup(pPager, 1);
if( p ){
p->pageHash = 0;
sqlite3PagerUnrefNotNull(p);
}
}
#endif
sqlite3BitvecDestroy(pPager->pInJournal);
pPager->pInJournal = 0;
pPager->nRec = 0;
if( rc==SQLITE_OK ){
if( MEMDB || pagerFlushOnCommit(pPager, bCommit) ){
sqlite3PcacheCleanAll(pPager->pPCache);
}else{
sqlite3PcacheClearWritable(pPager->pPCache);
}
sqlite3PcacheTruncate(pPager->pPCache, pPager->dbSize);
}
if( pagerUseWal(pPager) ){
/* Drop the WAL write-lock, if any. Also, if the connection was in
** locking_mode=exclusive mode but is no longer, drop the EXCLUSIVE
** lock held on the database file.
*/
rc2 = sqlite3WalEndWriteTransaction(pPager->pWal);
assert( rc2==SQLITE_OK );
}else if( rc==SQLITE_OK && bCommit && pPager->dbFileSize>pPager->dbSize ){
/* This branch is taken when committing a transaction in rollback-journal
** mode if the database file on disk is larger than the database image.
** At this point the journal has been finalized and the transaction
** successfully committed, but the EXCLUSIVE lock is still held on the
** file. So it is safe to truncate the database file to its minimum
** required size. */
assert( pPager->eLock==EXCLUSIVE_LOCK );
rc = pager_truncate(pPager, pPager->dbSize);
}
if( rc==SQLITE_OK && bCommit ){
rc = sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_COMMIT_PHASETWO, 0);
if( rc==SQLITE_NOTFOUND ) rc = SQLITE_OK;
}
if( !pPager->exclusiveMode
&& (!pagerUseWal(pPager) || sqlite3WalExclusiveMode(pPager->pWal, 0))
){
rc2 = pagerUnlockDb(pPager, SHARED_LOCK);
}
pPager->eState = PAGER_READER;
pPager->setSuper = 0;
return (rc==SQLITE_OK?rc2:rc);
}
/*
** Execute a rollback if a transaction is active and unlock the
** database file.
**
** If the pager has already entered the ERROR state, do not attempt
** the rollback at this time. Instead, pager_unlock() is called. The
** call to pager_unlock() will discard all in-memory pages, unlock
** the database file and move the pager back to OPEN state. If this
** means that there is a hot-journal left in the file-system, the next
** connection to obtain a shared lock on the pager (which may be this one)
** will roll it back.
**
** If the pager has not already entered the ERROR state, but an IO or
** malloc error occurs during a rollback, then this will itself cause
** the pager to enter the ERROR state. Which will be cleared by the
** call to pager_unlock(), as described above.
*/
static void pagerUnlockAndRollback(Pager *pPager){
if( pPager->eState!=PAGER_ERROR && pPager->eState!=PAGER_OPEN ){
assert( assert_pager_state(pPager) );
if( pPager->eState>=PAGER_WRITER_LOCKED ){
sqlite3BeginBenignMalloc();
sqlite3PagerRollback(pPager);
sqlite3EndBenignMalloc();
}else if( !pPager->exclusiveMode ){
assert( pPager->eState==PAGER_READER );
pager_end_transaction(pPager, 0, 0);
}
}
pager_unlock(pPager);
}
/*
** Parameter aData must point to a buffer of pPager->pageSize bytes
** of data. Compute and return a checksum based ont the contents of the
** page of data and the current value of pPager->cksumInit.
**
** This is not a real checksum. It is really just the sum of the
** random initial value (pPager->cksumInit) and every 200th byte
** of the page data, starting with byte offset (pPager->pageSize%200).
** Each byte is interpreted as an 8-bit unsigned integer.
**
** Changing the formula used to compute this checksum results in an
** incompatible journal file format.
**
** If journal corruption occurs due to a power failure, the most likely
** scenario is that one end or the other of the record will be changed.
** It is much less likely that the two ends of the journal record will be
** correct and the middle be corrupt. Thus, this "checksum" scheme,
** though fast and simple, catches the mostly likely kind of corruption.
*/
static u32 pager_cksum(Pager *pPager, const u8 *aData){
u32 cksum = pPager->cksumInit; /* Checksum value to return */
int i = pPager->pageSize-200; /* Loop counter */
while( i>0 ){
cksum += aData[i];
i -= 200;
}
return cksum;
}
/*
** Read a single page from either the journal file (if isMainJrnl==1) or
** from the sub-journal (if isMainJrnl==0) and playback that page.
** The page begins at offset *pOffset into the file. The *pOffset
** value is increased to the start of the next page in the journal.
**
** The main rollback journal uses checksums - the statement journal does
** not.
**
** If the page number of the page record read from the (sub-)journal file
** is greater than the current value of Pager.dbSize, then playback is
** skipped and SQLITE_OK is returned.
**
** If pDone is not NULL, then it is a record of pages that have already
** been played back. If the page at *pOffset has already been played back
** (if the corresponding pDone bit is set) then skip the playback.
** Make sure the pDone bit corresponding to the *pOffset page is set
** prior to returning.
**
** If the page record is successfully read from the (sub-)journal file
** and played back, then SQLITE_OK is returned. If an IO error occurs
** while reading the record from the (sub-)journal file or while writing
** to the database file, then the IO error code is returned. If data
** is successfully read from the (sub-)journal file but appears to be
** corrupted, SQLITE_DONE is returned. Data is considered corrupted in
** two circumstances:
**
** * If the record page-number is illegal (0 or PAGER_SJ_PGNO), or
** * If the record is being rolled back from the main journal file
** and the checksum field does not match the record content.
**
** Neither of these two scenarios are possible during a savepoint rollback.
**
** If this is a savepoint rollback, then memory may have to be dynamically
** allocated by this function. If this is the case and an allocation fails,
** SQLITE_NOMEM is returned.
*/
static int pager_playback_one_page(
Pager *pPager, /* The pager being played back */
i64 *pOffset, /* Offset of record to playback */
Bitvec *pDone, /* Bitvec of pages already played back */
int isMainJrnl, /* 1 -> main journal. 0 -> sub-journal. */
int isSavepnt /* True for a savepoint rollback */
){
int rc;
PgHdr *pPg; /* An existing page in the cache */
Pgno pgno; /* The page number of a page in journal */
u32 cksum; /* Checksum used for sanity checking */
char *aData; /* Temporary storage for the page */
sqlite3_file *jfd; /* The file descriptor for the journal file */
int isSynced; /* True if journal page is synced */
assert( (isMainJrnl&~1)==0 ); /* isMainJrnl is 0 or 1 */
assert( (isSavepnt&~1)==0 ); /* isSavepnt is 0 or 1 */
assert( isMainJrnl || pDone ); /* pDone always used on sub-journals */
assert( isSavepnt || pDone==0 ); /* pDone never used on non-savepoint */
aData = pPager->pTmpSpace;
assert( aData ); /* Temp storage must have already been allocated */
assert( pagerUseWal(pPager)==0 || (!isMainJrnl && isSavepnt) );
/* Either the state is greater than PAGER_WRITER_CACHEMOD (a transaction
** or savepoint rollback done at the request of the caller) or this is
** a hot-journal rollback. If it is a hot-journal rollback, the pager
** is in state OPEN and holds an EXCLUSIVE lock. Hot-journal rollback
** only reads from the main journal, not the sub-journal.
*/
assert( pPager->eState>=PAGER_WRITER_CACHEMOD
|| (pPager->eState==PAGER_OPEN && pPager->eLock==EXCLUSIVE_LOCK)
);
assert( pPager->eState>=PAGER_WRITER_CACHEMOD || isMainJrnl );
/* Read the page number and page data from the journal or sub-journal
** file. Return an error code to the caller if an IO error occurs.
*/
jfd = isMainJrnl ? pPager->jfd : pPager->sjfd;
rc = read32bits(jfd, *pOffset, &pgno);
if( rc!=SQLITE_OK ) return rc;
rc = sqlite3OsRead(jfd, (u8*)aData, pPager->pageSize, (*pOffset)+4);
if( rc!=SQLITE_OK ) return rc;
*pOffset += pPager->pageSize + 4 + isMainJrnl*4;
/* Sanity checking on the page. This is more important that I originally
** thought. If a power failure occurs while the journal is being written,
** it could cause invalid data to be written into the journal. We need to
** detect this invalid data (with high probability) and ignore it.
*/
if( pgno==0 || pgno==PAGER_SJ_PGNO(pPager) ){
assert( !isSavepnt );
return SQLITE_DONE;
}
if( pgno>(Pgno)pPager->dbSize || sqlite3BitvecTest(pDone, pgno) ){
return SQLITE_OK;
}
if( isMainJrnl ){
rc = read32bits(jfd, (*pOffset)-4, &cksum);
if( rc ) return rc;
if( !isSavepnt && pager_cksum(pPager, (u8*)aData)!=cksum ){
return SQLITE_DONE;
}
}
/* If this page has already been played back before during the current
** rollback, then don't bother to play it back again.
*/
if( pDone && (rc = sqlite3BitvecSet(pDone, pgno))!=SQLITE_OK ){
return rc;
}
/* When playing back page 1, restore the nReserve setting
*/
if( pgno==1 && pPager->nReserve!=((u8*)aData)[20] ){
pPager->nReserve = ((u8*)aData)[20];
}
/* If the pager is in CACHEMOD state, then there must be a copy of this
** page in the pager cache. In this case just update the pager cache,
** not the database file. The page is left marked dirty in this case.
**
** An exception to the above rule: If the database is in no-sync mode
** and a page is moved during an incremental vacuum then the page may
** not be in the pager cache. Later: if a malloc() or IO error occurs
** during a Movepage() call, then the page may not be in the cache
** either. So the condition described in the above paragraph is not
** assert()able.
**
** If in WRITER_DBMOD, WRITER_FINISHED or OPEN state, then we update the
** pager cache if it exists and the main file. The page is then marked
** not dirty. Since this code is only executed in PAGER_OPEN state for
** a hot-journal rollback, it is guaranteed that the page-cache is empty
** if the pager is in OPEN state.
**
** Ticket #1171: The statement journal might contain page content that is
** different from the page content at the start of the transaction.
** This occurs when a page is changed prior to the start of a statement
** then changed again within the statement. When rolling back such a
** statement we must not write to the original database unless we know
** for certain that original page contents are synced into the main rollback
** journal. Otherwise, a power loss might leave modified data in the
** database file without an entry in the rollback journal that can
** restore the database to its original form. Two conditions must be
** met before writing to the database files. (1) the database must be
** locked. (2) we know that the original page content is fully synced
** in the main journal either because the page is not in cache or else
** the page is marked as needSync==0.
**
** 2008-04-14: When attempting to vacuum a corrupt database file, it
** is possible to fail a statement on a database that does not yet exist.
** Do not attempt to write if database file has never been opened.
*/
if( pagerUseWal(pPager) ){
pPg = 0;
}else{
pPg = sqlite3PagerLookup(pPager, pgno);
}
assert( pPg || !MEMDB );
assert( pPager->eState!=PAGER_OPEN || pPg==0 || pPager->tempFile );
PAGERTRACE(("PLAYBACK %d page %d hash(%08x) %s\n",
PAGERID(pPager), pgno, pager_datahash(pPager->pageSize, (u8*)aData),
(isMainJrnl?"main-journal":"sub-journal")
));
if( isMainJrnl ){
isSynced = pPager->noSync || (*pOffset <= pPager->journalHdr);
}else{
isSynced = (pPg==0 || 0==(pPg->flags & PGHDR_NEED_SYNC));
}
if( isOpen(pPager->fd)
&& (pPager->eState>=PAGER_WRITER_DBMOD || pPager->eState==PAGER_OPEN)
&& isSynced
){
i64 ofst = (pgno-1)*(i64)pPager->pageSize;
testcase( !isSavepnt && pPg!=0 && (pPg->flags&PGHDR_NEED_SYNC)!=0 );
assert( !pagerUseWal(pPager) );
/* Write the data read from the journal back into the database file.
** This is usually safe even for an encrypted database - as the data
** was encrypted before it was written to the journal file. The exception
** is if the data was just read from an in-memory sub-journal. In that
** case it must be encrypted here before it is copied into the database
** file. */
rc = sqlite3OsWrite(pPager->fd, (u8 *)aData, pPager->pageSize, ofst);
if( pgno>pPager->dbFileSize ){
pPager->dbFileSize = pgno;
}
if( pPager->pBackup ){
sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)aData);
}
}else if( !isMainJrnl && pPg==0 ){
/* If this is a rollback of a savepoint and data was not written to
** the database and the page is not in-memory, there is a potential
** problem. When the page is next fetched by the b-tree layer, it
** will be read from the database file, which may or may not be
** current.
**
** There are a couple of different ways this can happen. All are quite
** obscure. When running in synchronous mode, this can only happen
** if the page is on the free-list at the start of the transaction, then
** populated, then moved using sqlite3PagerMovepage().
**
** The solution is to add an in-memory page to the cache containing
** the data just read from the sub-journal. Mark the page as dirty
** and if the pager requires a journal-sync, then mark the page as
** requiring a journal-sync before it is written.
*/
assert( isSavepnt );
assert( (pPager->doNotSpill & SPILLFLAG_ROLLBACK)==0 );
pPager->doNotSpill |= SPILLFLAG_ROLLBACK;
rc = sqlite3PagerGet(pPager, pgno, &pPg, 1);
assert( (pPager->doNotSpill & SPILLFLAG_ROLLBACK)!=0 );
pPager->doNotSpill &= ~SPILLFLAG_ROLLBACK;
if( rc!=SQLITE_OK ) return rc;
sqlite3PcacheMakeDirty(pPg);
}
if( pPg ){
/* No page should ever be explicitly rolled back that is in use, except
** for page 1 which is held in use in order to keep the lock on the
** database active. However such a page may be rolled back as a result
** of an internal error resulting in an automatic call to
** sqlite3PagerRollback().
*/
void *pData;
pData = pPg->pData;
memcpy(pData, (u8*)aData, pPager->pageSize);
pPager->xReiniter(pPg);
/* It used to be that sqlite3PcacheMakeClean(pPg) was called here. But
** that call was dangerous and had no detectable benefit since the cache
** is normally cleaned by sqlite3PcacheCleanAll() after rollback and so
** has been removed. */
pager_set_pagehash(pPg);
/* If this was page 1, then restore the value of Pager.dbFileVers.
** Do this before any decoding. */
if( pgno==1 ){
memcpy(&pPager->dbFileVers, &((u8*)pData)[24],sizeof(pPager->dbFileVers));
}
sqlite3PcacheRelease(pPg);
}
return rc;
}
/*
** Parameter zSuper is the name of a super-journal file. A single journal
** file that referred to the super-journal file has just been rolled back.
** This routine checks if it is possible to delete the super-journal file,
** and does so if it is.
**
** Argument zSuper may point to Pager.pTmpSpace. So that buffer is not
** available for use within this function.
**
** When a super-journal file is created, it is populated with the names
** of all of its child journals, one after another, formatted as utf-8
** encoded text. The end of each child journal file is marked with a
** nul-terminator byte (0x00). i.e. the entire contents of a super-journal
** file for a transaction involving two databases might be:
**
** "/home/bill/a.db-journal\x00/home/bill/b.db-journal\x00"
**
** A super-journal file may only be deleted once all of its child
** journals have been rolled back.
**
** This function reads the contents of the super-journal file into
** memory and loops through each of the child journal names. For
** each child journal, it checks if:
**
** * if the child journal exists, and if so
** * if the child journal contains a reference to super-journal
** file zSuper
**
** If a child journal can be found that matches both of the criteria
** above, this function returns without doing anything. Otherwise, if
** no such child journal can be found, file zSuper is deleted from
** the file-system using sqlite3OsDelete().
**
** If an IO error within this function, an error code is returned. This
** function allocates memory by calling sqlite3Malloc(). If an allocation
** fails, SQLITE_NOMEM is returned. Otherwise, if no IO or malloc errors
** occur, SQLITE_OK is returned.
**
** TODO: This function allocates a single block of memory to load
** the entire contents of the super-journal file. This could be
** a couple of kilobytes or so - potentially larger than the page
** size.
*/
static int pager_delsuper(Pager *pPager, const char *zSuper){
sqlite3_vfs *pVfs = pPager->pVfs;
int rc; /* Return code */
sqlite3_file *pSuper; /* Malloc'd super-journal file descriptor */
sqlite3_file *pJournal; /* Malloc'd child-journal file descriptor */
char *zSuperJournal = 0; /* Contents of super-journal file */
i64 nSuperJournal; /* Size of super-journal file */
char *zJournal; /* Pointer to one journal within MJ file */
char *zSuperPtr; /* Space to hold super-journal filename */
char *zFree = 0; /* Free this buffer */
int nSuperPtr; /* Amount of space allocated to zSuperPtr[] */
/* Allocate space for both the pJournal and pSuper file descriptors.
** If successful, open the super-journal file for reading.
*/
pSuper = (sqlite3_file *)sqlite3MallocZero(pVfs->szOsFile * 2);
if( !pSuper ){
rc = SQLITE_NOMEM_BKPT;
pJournal = 0;
}else{
const int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_SUPER_JOURNAL);
rc = sqlite3OsOpen(pVfs, zSuper, pSuper, flags, 0);
pJournal = (sqlite3_file *)(((u8 *)pSuper) + pVfs->szOsFile);
}
if( rc!=SQLITE_OK ) goto delsuper_out;
/* Load the entire super-journal file into space obtained from
** sqlite3_malloc() and pointed to by zSuperJournal. Also obtain
** sufficient space (in zSuperPtr) to hold the names of super-journal
** files extracted from regular rollback-journals.
*/
rc = sqlite3OsFileSize(pSuper, &nSuperJournal);
if( rc!=SQLITE_OK ) goto delsuper_out;
nSuperPtr = pVfs->mxPathname+1;
zFree = sqlite3Malloc(4 + nSuperJournal + nSuperPtr + 2);
if( !zFree ){
rc = SQLITE_NOMEM_BKPT;
goto delsuper_out;
}
zFree[0] = zFree[1] = zFree[2] = zFree[3] = 0;
zSuperJournal = &zFree[4];
zSuperPtr = &zSuperJournal[nSuperJournal+2];
rc = sqlite3OsRead(pSuper, zSuperJournal, (int)nSuperJournal, 0);
if( rc!=SQLITE_OK ) goto delsuper_out;
zSuperJournal[nSuperJournal] = 0;
zSuperJournal[nSuperJournal+1] = 0;
zJournal = zSuperJournal;
while( (zJournal-zSuperJournal)<nSuperJournal ){
int exists;
rc = sqlite3OsAccess(pVfs, zJournal, SQLITE_ACCESS_EXISTS, &exists);
if( rc!=SQLITE_OK ){
goto delsuper_out;
}
if( exists ){
/* One of the journals pointed to by the super-journal exists.
** Open it and check if it points at the super-journal. If
** so, return without deleting the super-journal file.
** NB: zJournal is really a MAIN_JOURNAL. But call it a
** SUPER_JOURNAL here so that the VFS will not send the zJournal
** name into sqlite3_database_file_object().
*/
int c;
int flags = (SQLITE_OPEN_READONLY|SQLITE_OPEN_SUPER_JOURNAL);
rc = sqlite3OsOpen(pVfs, zJournal, pJournal, flags, 0);
if( rc!=SQLITE_OK ){
goto delsuper_out;
}
rc = readSuperJournal(pJournal, zSuperPtr, nSuperPtr);
sqlite3OsClose(pJournal);
if( rc!=SQLITE_OK ){
goto delsuper_out;
}
c = zSuperPtr[0]!=0 && strcmp(zSuperPtr, zSuper)==0;
if( c ){
/* We have a match. Do not delete the super-journal file. */
goto delsuper_out;
}
}
zJournal += (sqlite3Strlen30(zJournal)+1);
}
sqlite3OsClose(pSuper);
rc = sqlite3OsDelete(pVfs, zSuper, 0);
delsuper_out:
sqlite3_free(zFree);
if( pSuper ){
sqlite3OsClose(pSuper);
assert( !isOpen(pJournal) );
sqlite3_free(pSuper);
}
return rc;
}
/*
** This function is used to change the actual size of the database
** file in the file-system. This only happens when committing a transaction,
** or rolling back a transaction (including rolling back a hot-journal).
**
** If the main database file is not open, or the pager is not in either
** DBMOD or OPEN state, this function is a no-op. Otherwise, the size
** of the file is changed to nPage pages (nPage*pPager->pageSize bytes).
** If the file on disk is currently larger than nPage pages, then use the VFS
** xTruncate() method to truncate it.
**
** Or, it might be the case that the file on disk is smaller than
** nPage pages. Some operating system implementations can get confused if
** you try to truncate a file to some size that is larger than it
** currently is, so detect this case and write a single zero byte to
** the end of the new file instead.
**
** If successful, return SQLITE_OK. If an IO error occurs while modifying
** the database file, return the error code to the caller.
*/
static int pager_truncate(Pager *pPager, Pgno nPage){
int rc = SQLITE_OK;
assert( pPager->eState!=PAGER_ERROR );
assert( pPager->eState!=PAGER_READER );
if( isOpen(pPager->fd)
&& (pPager->eState>=PAGER_WRITER_DBMOD || pPager->eState==PAGER_OPEN)
){
i64 currentSize, newSize;
int szPage = pPager->pageSize;
assert( pPager->eLock==EXCLUSIVE_LOCK );
/* TODO: Is it safe to use Pager.dbFileSize here? */
rc = sqlite3OsFileSize(pPager->fd, ¤tSize);
newSize = szPage*(i64)nPage;
if( rc==SQLITE_OK && currentSize!=newSize ){
if( currentSize>newSize ){
rc = sqlite3OsTruncate(pPager->fd, newSize);
}else if( (currentSize+szPage)<=newSize ){
char *pTmp = pPager->pTmpSpace;
memset(pTmp, 0, szPage);
testcase( (newSize-szPage) == currentSize );
testcase( (newSize-szPage) > currentSize );
sqlite3OsFileControlHint(pPager->fd, SQLITE_FCNTL_SIZE_HINT, &newSize);
rc = sqlite3OsWrite(pPager->fd, pTmp, szPage, newSize-szPage);
}
if( rc==SQLITE_OK ){
pPager->dbFileSize = nPage;
}
}
}
return rc;
}
/*
** Return a sanitized version of the sector-size of OS file pFile. The
** return value is guaranteed to lie between 32 and MAX_SECTOR_SIZE.
*/
int sqlite3SectorSize(sqlite3_file *pFile){
int iRet = sqlite3OsSectorSize(pFile);
if( iRet<32 ){
iRet = 512;
}else if( iRet>MAX_SECTOR_SIZE ){
assert( MAX_SECTOR_SIZE>=512 );
iRet = MAX_SECTOR_SIZE;
}
return iRet;
}
/*
** Set the value of the Pager.sectorSize variable for the given
** pager based on the value returned by the xSectorSize method
** of the open database file. The sector size will be used
** to determine the size and alignment of journal header and
** super-journal pointers within created journal files.
**
** For temporary files the effective sector size is always 512 bytes.
**
** Otherwise, for non-temporary files, the effective sector size is
** the value returned by the xSectorSize() method rounded up to 32 if
** it is less than 32, or rounded down to MAX_SECTOR_SIZE if it
** is greater than MAX_SECTOR_SIZE.
**
** If the file has the SQLITE_IOCAP_POWERSAFE_OVERWRITE property, then set
** the effective sector size to its minimum value (512). The purpose of
** pPager->sectorSize is to define the "blast radius" of bytes that
** might change if a crash occurs while writing to a single byte in
** that range. But with POWERSAFE_OVERWRITE, the blast radius is zero
** (that is what POWERSAFE_OVERWRITE means), so we minimize the sector
** size. For backwards compatibility of the rollback journal file format,
** we cannot reduce the effective sector size below 512.
*/
static void setSectorSize(Pager *pPager){
assert( isOpen(pPager->fd) || pPager->tempFile );
if( pPager->tempFile
|| (sqlite3OsDeviceCharacteristics(pPager->fd) &
SQLITE_IOCAP_POWERSAFE_OVERWRITE)!=0
){
/* Sector size doesn't matter for temporary files. Also, the file
** may not have been opened yet, in which case the OsSectorSize()
** call will segfault. */
pPager->sectorSize = 512;
}else{
pPager->sectorSize = sqlite3SectorSize(pPager->fd);
}
}
/*
** Playback the journal and thus restore the database file to
** the state it was in before we started making changes.
**
** The journal file format is as follows:
**
** (1) 8 byte prefix. A copy of aJournalMagic[].
** (2) 4 byte big-endian integer which is the number of valid page records
** in the journal. If this value is 0xffffffff, then compute the
** number of page records from the journal size.
** (3) 4 byte big-endian integer which is the initial value for the
** sanity checksum.
** (4) 4 byte integer which is the number of pages to truncate the
** database to during a rollback.
** (5) 4 byte big-endian integer which is the sector size. The header
** is this many bytes in size.
** (6) 4 byte big-endian integer which is the page size.
** (7) zero padding out to the next sector size.
** (8) Zero or more pages instances, each as follows:
** + 4 byte page number.
** + pPager->pageSize bytes of data.
** + 4 byte checksum
**
** When we speak of the journal header, we mean the first 7 items above.
** Each entry in the journal is an instance of the 8th item.
**
** Call the value from the second bullet "nRec". nRec is the number of
** valid page entries in the journal. In most cases, you can compute the
** value of nRec from the size of the journal file. But if a power
** failure occurred while the journal was being written, it could be the
** case that the size of the journal file had already been increased but
** the extra entries had not yet made it safely to disk. In such a case,
** the value of nRec computed from the file size would be too large. For
** that reason, we always use the nRec value in the header.
**
** If the nRec value is 0xffffffff it means that nRec should be computed
** from the file size. This value is used when the user selects the
** no-sync option for the journal. A power failure could lead to corruption
** in this case. But for things like temporary table (which will be
** deleted when the power is restored) we don't care.
**
** If the file opened as the journal file is not a well-formed
** journal file then all pages up to the first corrupted page are rolled
** back (or no pages if the journal header is corrupted). The journal file
** is then deleted and SQLITE_OK returned, just as if no corruption had
** been encountered.
**
** If an I/O or malloc() error occurs, the journal-file is not deleted
** and an error code is returned.
**
** The isHot parameter indicates that we are trying to rollback a journal
** that might be a hot journal. Or, it could be that the journal is
** preserved because of JOURNALMODE_PERSIST or JOURNALMODE_TRUNCATE.
** If the journal really is hot, reset the pager cache prior rolling
** back any content. If the journal is merely persistent, no reset is
** needed.
*/
static int pager_playback(Pager *pPager, int isHot){
sqlite3_vfs *pVfs = pPager->pVfs;
i64 szJ; /* Size of the journal file in bytes */
u32 nRec; /* Number of Records in the journal */
u32 u; /* Unsigned loop counter */
Pgno mxPg = 0; /* Size of the original file in pages */
int rc; /* Result code of a subroutine */
int res = 1; /* Value returned by sqlite3OsAccess() */
char *zSuper = 0; /* Name of super-journal file if any */
int needPagerReset; /* True to reset page prior to first page rollback */
int nPlayback = 0; /* Total number of pages restored from journal */
u32 savedPageSize = pPager->pageSize;
/* Figure out how many records are in the journal. Abort early if
** the journal is empty.
*/
assert( isOpen(pPager->jfd) );
rc = sqlite3OsFileSize(pPager->jfd, &szJ);
if( rc!=SQLITE_OK ){
goto end_playback;
}
/* Read the super-journal name from the journal, if it is present.
** If a super-journal file name is specified, but the file is not
** present on disk, then the journal is not hot and does not need to be
** played back.
**
** TODO: Technically the following is an error because it assumes that
** buffer Pager.pTmpSpace is (mxPathname+1) bytes or larger. i.e. that
** (pPager->pageSize >= pPager->pVfs->mxPathname+1). Using os_unix.c,
** mxPathname is 512, which is the same as the minimum allowable value
** for pageSize.
*/
zSuper = pPager->pTmpSpace;
rc = readSuperJournal(pPager->jfd, zSuper, pPager->pVfs->mxPathname+1);
if( rc==SQLITE_OK && zSuper[0] ){
rc = sqlite3OsAccess(pVfs, zSuper, SQLITE_ACCESS_EXISTS, &res);
}
zSuper = 0;
if( rc!=SQLITE_OK || !res ){
goto end_playback;
}
pPager->journalOff = 0;
needPagerReset = isHot;
/* This loop terminates either when a readJournalHdr() or
** pager_playback_one_page() call returns SQLITE_DONE or an IO error
** occurs.
*/
while( 1 ){
/* Read the next journal header from the journal file. If there are
** not enough bytes left in the journal file for a complete header, or
** it is corrupted, then a process must have failed while writing it.
** This indicates nothing more needs to be rolled back.
*/
rc = readJournalHdr(pPager, isHot, szJ, &nRec, &mxPg);
if( rc!=SQLITE_OK ){
if( rc==SQLITE_DONE ){
rc = SQLITE_OK;
}
goto end_playback;
}
/* If nRec is 0xffffffff, then this journal was created by a process
** working in no-sync mode. This means that the rest of the journal
** file consists of pages, there are no more journal headers. Compute
** the value of nRec based on this assumption.
*/
if( nRec==0xffffffff ){
assert( pPager->journalOff==JOURNAL_HDR_SZ(pPager) );
nRec = (int)((szJ - JOURNAL_HDR_SZ(pPager))/JOURNAL_PG_SZ(pPager));
}
/* If nRec is 0 and this rollback is of a transaction created by this
** process and if this is the final header in the journal, then it means
** that this part of the journal was being filled but has not yet been
** synced to disk. Compute the number of pages based on the remaining
** size of the file.
**
** The third term of the test was added to fix ticket #2565.
** When rolling back a hot journal, nRec==0 always means that the next
** chunk of the journal contains zero pages to be rolled back. But
** when doing a ROLLBACK and the nRec==0 chunk is the last chunk in
** the journal, it means that the journal might contain additional
** pages that need to be rolled back and that the number of pages
** should be computed based on the journal file size.
*/
if( nRec==0 && !isHot &&
pPager->journalHdr+JOURNAL_HDR_SZ(pPager)==pPager->journalOff ){
nRec = (int)((szJ - pPager->journalOff) / JOURNAL_PG_SZ(pPager));
}
/* If this is the first header read from the journal, truncate the
** database file back to its original size.
*/
if( pPager->journalOff==JOURNAL_HDR_SZ(pPager) ){
rc = pager_truncate(pPager, mxPg);
if( rc!=SQLITE_OK ){
goto end_playback;
}
pPager->dbSize = mxPg;
if( pPager->mxPgno<mxPg ){
pPager->mxPgno = mxPg;
}
}
/* Copy original pages out of the journal and back into the
** database file and/or page cache.
*/
for(u=0; u<nRec; u++){
if( needPagerReset ){
pager_reset(pPager);
needPagerReset = 0;
}
rc = pager_playback_one_page(pPager,&pPager->journalOff,0,1,0);
if( rc==SQLITE_OK ){
nPlayback++;
}else{
if( rc==SQLITE_DONE ){
pPager->journalOff = szJ;
break;
}else if( rc==SQLITE_IOERR_SHORT_READ ){
/* If the journal has been truncated, simply stop reading and
** processing the journal. This might happen if the journal was
** not completely written and synced prior to a crash. In that
** case, the database should have never been written in the
** first place so it is OK to simply abandon the rollback. */
rc = SQLITE_OK;
goto end_playback;
}else{
/* If we are unable to rollback, quit and return the error
** code. This will cause the pager to enter the error state
** so that no further harm will be done. Perhaps the next
** process to come along will be able to rollback the database.
*/
goto end_playback;
}
}
}
}
/*NOTREACHED*/
assert( 0 );
end_playback:
if( rc==SQLITE_OK ){
rc = sqlite3PagerSetPagesize(pPager, &savedPageSize, -1);
}
/* Following a rollback, the database file should be back in its original
** state prior to the start of the transaction, so invoke the
** SQLITE_FCNTL_DB_UNCHANGED file-control method to disable the
** assertion that the transaction counter was modified.
*/
#ifdef SQLITE_DEBUG
sqlite3OsFileControlHint(pPager->fd,SQLITE_FCNTL_DB_UNCHANGED,0);
#endif
/* If this playback is happening automatically as a result of an IO or
** malloc error that occurred after the change-counter was updated but
** before the transaction was committed, then the change-counter
** modification may just have been reverted. If this happens in exclusive
** mode, then subsequent transactions performed by the connection will not
** update the change-counter at all. This may lead to cache inconsistency
** problems for other processes at some point in the future. So, just
** in case this has happened, clear the changeCountDone flag now.
*/
pPager->changeCountDone = pPager->tempFile;
if( rc==SQLITE_OK ){
/* Leave 4 bytes of space before the super-journal filename in memory.
** This is because it may end up being passed to sqlite3OsOpen(), in
** which case it requires 4 0x00 bytes in memory immediately before
** the filename. */
zSuper = &pPager->pTmpSpace[4];
rc = readSuperJournal(pPager->jfd, zSuper, pPager->pVfs->mxPathname+1);
testcase( rc!=SQLITE_OK );
}
if( rc==SQLITE_OK
&& (pPager->eState>=PAGER_WRITER_DBMOD || pPager->eState==PAGER_OPEN)
){
rc = sqlite3PagerSync(pPager, 0);
}
if( rc==SQLITE_OK ){
rc = pager_end_transaction(pPager, zSuper[0]!='\0', 0);
testcase( rc!=SQLITE_OK );
}
if( rc==SQLITE_OK && zSuper[0] && res ){
/* If there was a super-journal and this routine will return success,
** see if it is possible to delete the super-journal.
*/
assert( zSuper==&pPager->pTmpSpace[4] );
memset(&zSuper[-4], 0, 4);
rc = pager_delsuper(pPager, zSuper);
testcase( rc!=SQLITE_OK );
}
if( isHot && nPlayback ){
sqlite3_log(SQLITE_NOTICE_RECOVER_ROLLBACK, "recovered %d pages from %s",
nPlayback, pPager->zJournal);
}
/* The Pager.sectorSize variable may have been updated while rolling
** back a journal created by a process with a different sector size
** value. Reset it to the correct value for this process.
*/
setSectorSize(pPager);
return rc;
}
/*
** Read the content for page pPg out of the database file (or out of
** the WAL if that is where the most recent copy if found) into
** pPg->pData. A shared lock or greater must be held on the database
** file before this function is called.
**
** If page 1 is read, then the value of Pager.dbFileVers[] is set to
** the value read from the database file.
**
** If an IO error occurs, then the IO error is returned to the caller.
** Otherwise, SQLITE_OK is returned.
*/
static int readDbPage(PgHdr *pPg){
Pager *pPager = pPg->pPager; /* Pager object associated with page pPg */
int rc = SQLITE_OK; /* Return code */
#ifndef SQLITE_OMIT_WAL
u32 iFrame = 0; /* Frame of WAL containing pgno */
assert( pPager->eState>=PAGER_READER && !MEMDB );
assert( isOpen(pPager->fd) );
if( pagerUseWal(pPager) ){
rc = sqlite3WalFindFrame(pPager->pWal, pPg->pgno, &iFrame);
if( rc ) return rc;
}
if( iFrame ){
rc = sqlite3WalReadFrame(pPager->pWal, iFrame,pPager->pageSize,pPg->pData);
}else
#endif
{
i64 iOffset = (pPg->pgno-1)*(i64)pPager->pageSize;
rc = sqlite3OsRead(pPager->fd, pPg->pData, pPager->pageSize, iOffset);
if( rc==SQLITE_IOERR_SHORT_READ ){
rc = SQLITE_OK;
}
}
if( pPg->pgno==1 ){
if( rc ){
/* If the read is unsuccessful, set the dbFileVers[] to something
** that will never be a valid file version. dbFileVers[] is a copy
** of bytes 24..39 of the database. Bytes 28..31 should always be
** zero or the size of the database in page. Bytes 32..35 and 35..39
** should be page numbers which are never 0xffffffff. So filling
** pPager->dbFileVers[] with all 0xff bytes should suffice.
**
** For an encrypted database, the situation is more complex: bytes
** 24..39 of the database are white noise. But the probability of
** white noise equaling 16 bytes of 0xff is vanishingly small so
** we should still be ok.
*/
memset(pPager->dbFileVers, 0xff, sizeof(pPager->dbFileVers));
}else{
u8 *dbFileVers = &((u8*)pPg->pData)[24];
memcpy(&pPager->dbFileVers, dbFileVers, sizeof(pPager->dbFileVers));
}
}
PAGER_INCR(sqlite3_pager_readdb_count);
PAGER_INCR(pPager->nRead);
IOTRACE(("PGIN %p %d\n", pPager, pPg->pgno));
PAGERTRACE(("FETCH %d page %d hash(%08x)\n",
PAGERID(pPager), pPg->pgno, pager_pagehash(pPg)));
return rc;
}
/*
** Update the value of the change-counter at offsets 24 and 92 in
** the header and the sqlite version number at offset 96.
**
** This is an unconditional update. See also the pager_incr_changecounter()
** routine which only updates the change-counter if the update is actually
** needed, as determined by the pPager->changeCountDone state variable.
*/
static void pager_write_changecounter(PgHdr *pPg){
u32 change_counter;
if( NEVER(pPg==0) ) return;
/* Increment the value just read and write it back to byte 24. */
change_counter = sqlite3Get4byte((u8*)pPg->pPager->dbFileVers)+1;
put32bits(((char*)pPg->pData)+24, change_counter);
/* Also store the SQLite version number in bytes 96..99 and in
** bytes 92..95 store the change counter for which the version number
** is valid. */
put32bits(((char*)pPg->pData)+92, change_counter);
put32bits(((char*)pPg->pData)+96, SQLITE_VERSION_NUMBER);
}
#ifndef SQLITE_OMIT_WAL
/*
** This function is invoked once for each page that has already been
** written into the log file when a WAL transaction is rolled back.
** Parameter iPg is the page number of said page. The pCtx argument
** is actually a pointer to the Pager structure.
**
** If page iPg is present in the cache, and has no outstanding references,
** it is discarded. Otherwise, if there are one or more outstanding
** references, the page content is reloaded from the database. If the
** attempt to reload content from the database is required and fails,
** return an SQLite error code. Otherwise, SQLITE_OK.
*/
static int pagerUndoCallback(void *pCtx, Pgno iPg){
int rc = SQLITE_OK;
Pager *pPager = (Pager *)pCtx;
PgHdr *pPg;
assert( pagerUseWal(pPager) );
pPg = sqlite3PagerLookup(pPager, iPg);
if( pPg ){
if( sqlite3PcachePageRefcount(pPg)==1 ){
sqlite3PcacheDrop(pPg);
}else{
rc = readDbPage(pPg);
if( rc==SQLITE_OK ){
pPager->xReiniter(pPg);
}
sqlite3PagerUnrefNotNull(pPg);
}
}
/* Normally, if a transaction is rolled back, any backup processes are
** updated as data is copied out of the rollback journal and into the
** database. This is not generally possible with a WAL database, as
** rollback involves simply truncating the log file. Therefore, if one
** or more frames have already been written to the log (and therefore
** also copied into the backup databases) as part of this transaction,
** the backups must be restarted.
*/
sqlite3BackupRestart(pPager->pBackup);
return rc;
}
/*
** This function is called to rollback a transaction on a WAL database.
*/
static int pagerRollbackWal(Pager *pPager){
int rc; /* Return Code */
PgHdr *pList; /* List of dirty pages to revert */
/* For all pages in the cache that are currently dirty or have already
** been written (but not committed) to the log file, do one of the
** following:
**
** + Discard the cached page (if refcount==0), or
** + Reload page content from the database (if refcount>0).
*/
pPager->dbSize = pPager->dbOrigSize;
rc = sqlite3WalUndo(pPager->pWal, pagerUndoCallback, (void *)pPager);
pList = sqlite3PcacheDirtyList(pPager->pPCache);
while( pList && rc==SQLITE_OK ){
PgHdr *pNext = pList->pDirty;
rc = pagerUndoCallback((void *)pPager, pList->pgno);
pList = pNext;
}
return rc;
}
/*
** This function is a wrapper around sqlite3WalFrames(). As well as logging
** the contents of the list of pages headed by pList (connected by pDirty),
** this function notifies any active backup processes that the pages have
** changed.
**
** The list of pages passed into this routine is always sorted by page number.
** Hence, if page 1 appears anywhere on the list, it will be the first page.
*/
static int pagerWalFrames(
Pager *pPager, /* Pager object */
PgHdr *pList, /* List of frames to log */
Pgno nTruncate, /* Database size after this commit */
int isCommit /* True if this is a commit */
){
int rc; /* Return code */
int nList; /* Number of pages in pList */
PgHdr *p; /* For looping over pages */
assert( pPager->pWal );
assert( pList );
#ifdef SQLITE_DEBUG
/* Verify that the page list is in accending order */
for(p=pList; p && p->pDirty; p=p->pDirty){
assert( p->pgno < p->pDirty->pgno );
}
#endif
assert( pList->pDirty==0 || isCommit );
if( isCommit ){
/* If a WAL transaction is being committed, there is no point in writing
** any pages with page numbers greater than nTruncate into the WAL file.
** They will never be read by any client. So remove them from the pDirty
** list here. */
PgHdr **ppNext = &pList;
nList = 0;
for(p=pList; (*ppNext = p)!=0; p=p->pDirty){
if( p->pgno<=nTruncate ){
ppNext = &p->pDirty;
nList++;
}
}
assert( pList );
}else{
nList = 1;
}
pPager->aStat[PAGER_STAT_WRITE] += nList;
if( pList->pgno==1 ) pager_write_changecounter(pList);
rc = sqlite3WalFrames(pPager->pWal,
pPager->pageSize, pList, nTruncate, isCommit, pPager->walSyncFlags
);
if( rc==SQLITE_OK && pPager->pBackup ){
for(p=pList; p; p=p->pDirty){
sqlite3BackupUpdate(pPager->pBackup, p->pgno, (u8 *)p->pData);
}
}
#ifdef SQLITE_CHECK_PAGES
pList = sqlite3PcacheDirtyList(pPager->pPCache);
for(p=pList; p; p=p->pDirty){
pager_set_pagehash(p);
}
#endif
return rc;
}
/*
** Begin a read transaction on the WAL.
**
** This routine used to be called "pagerOpenSnapshot()" because it essentially
** makes a snapshot of the database at the current point in time and preserves
** that snapshot for use by the reader in spite of concurrently changes by
** other writers or checkpointers.
*/
static int pagerBeginReadTransaction(Pager *pPager){
int rc; /* Return code */
int changed = 0; /* True if cache must be reset */
assert( pagerUseWal(pPager) );
assert( pPager->eState==PAGER_OPEN || pPager->eState==PAGER_READER );
/* sqlite3WalEndReadTransaction() was not called for the previous
** transaction in locking_mode=EXCLUSIVE. So call it now. If we
** are in locking_mode=NORMAL and EndRead() was previously called,
** the duplicate call is harmless.
*/
sqlite3WalEndReadTransaction(pPager->pWal);
rc = sqlite3WalBeginReadTransaction(pPager->pWal, &changed);
if( rc!=SQLITE_OK || changed ){
pager_reset(pPager);
if( USEFETCH(pPager) ) sqlite3OsUnfetch(pPager->fd, 0, 0);
}
return rc;
}
#endif
/*
** This function is called as part of the transition from PAGER_OPEN
** to PAGER_READER state to determine the size of the database file
** in pages (assuming the page size currently stored in Pager.pageSize).
**
** If no error occurs, SQLITE_OK is returned and the size of the database
** in pages is stored in *pnPage. Otherwise, an error code (perhaps
** SQLITE_IOERR_FSTAT) is returned and *pnPage is left unmodified.
*/
static int pagerPagecount(Pager *pPager, Pgno *pnPage){
Pgno nPage; /* Value to return via *pnPage */
/* Query the WAL sub-system for the database size. The WalDbsize()
** function returns zero if the WAL is not open (i.e. Pager.pWal==0), or
** if the database size is not available. The database size is not
** available from the WAL sub-system if the log file is empty or
** contains no valid committed transactions.
*/
assert( pPager->eState==PAGER_OPEN );
assert( pPager->eLock>=SHARED_LOCK );
assert( isOpen(pPager->fd) );
assert( pPager->tempFile==0 );
nPage = sqlite3WalDbsize(pPager->pWal);
/* If the number of pages in the database is not available from the
** WAL sub-system, determine the page count based on the size of
** the database file. If the size of the database file is not an
** integer multiple of the page-size, round up the result.
*/
if( nPage==0 && ALWAYS(isOpen(pPager->fd)) ){
i64 n = 0; /* Size of db file in bytes */
int rc = sqlite3OsFileSize(pPager->fd, &n);
if( rc!=SQLITE_OK ){
return rc;
}
nPage = (Pgno)((n+pPager->pageSize-1) / pPager->pageSize);
}
/* If the current number of pages in the file is greater than the
** configured maximum pager number, increase the allowed limit so
** that the file can be read.
*/
if( nPage>pPager->mxPgno ){
pPager->mxPgno = (Pgno)nPage;
}
*pnPage = nPage;
return SQLITE_OK;
}
#ifndef SQLITE_OMIT_WAL
/*
** Check if the *-wal file that corresponds to the database opened by pPager
** exists if the database is not empy, or verify that the *-wal file does
** not exist (by deleting it) if the database file is empty.
**
** If the database is not empty and the *-wal file exists, open the pager
** in WAL mode. If the database is empty or if no *-wal file exists and
** if no error occurs, make sure Pager.journalMode is not set to
** PAGER_JOURNALMODE_WAL.
**
** Return SQLITE_OK or an error code.
**
** The caller must hold a SHARED lock on the database file to call this
** function. Because an EXCLUSIVE lock on the db file is required to delete
** a WAL on a none-empty database, this ensures there is no race condition
** between the xAccess() below and an xDelete() being executed by some
** other connection.
*/
static int pagerOpenWalIfPresent(Pager *pPager){
int rc = SQLITE_OK;
assert( pPager->eState==PAGER_OPEN );
assert( pPager->eLock>=SHARED_LOCK );
if( !pPager->tempFile ){
int isWal; /* True if WAL file exists */
rc = sqlite3OsAccess(
pPager->pVfs, pPager->zWal, SQLITE_ACCESS_EXISTS, &isWal
);
if( rc==SQLITE_OK ){
if( isWal ){
Pgno nPage; /* Size of the database file */
rc = pagerPagecount(pPager, &nPage);
if( rc ) return rc;
if( nPage==0 ){
rc = sqlite3OsDelete(pPager->pVfs, pPager->zWal, 0);
}else{
testcase( sqlite3PcachePagecount(pPager->pPCache)==0 );
rc = sqlite3PagerOpenWal(pPager, 0);
}
}else if( pPager->journalMode==PAGER_JOURNALMODE_WAL ){
pPager->journalMode = PAGER_JOURNALMODE_DELETE;
}
}
}
return rc;
}
#endif
/*
** Playback savepoint pSavepoint. Or, if pSavepoint==NULL, then playback
** the entire super-journal file. The case pSavepoint==NULL occurs when
** a ROLLBACK TO command is invoked on a SAVEPOINT that is a transaction
** savepoint.
**
** When pSavepoint is not NULL (meaning a non-transaction savepoint is
** being rolled back), then the rollback consists of up to three stages,
** performed in the order specified:
**
** * Pages are played back from the main journal starting at byte
** offset PagerSavepoint.iOffset and continuing to
** PagerSavepoint.iHdrOffset, or to the end of the main journal
** file if PagerSavepoint.iHdrOffset is zero.
**
** * If PagerSavepoint.iHdrOffset is not zero, then pages are played
** back starting from the journal header immediately following
** PagerSavepoint.iHdrOffset to the end of the main journal file.
**
** * Pages are then played back from the sub-journal file, starting
** with the PagerSavepoint.iSubRec and continuing to the end of
** the journal file.
**
** Throughout the rollback process, each time a page is rolled back, the
** corresponding bit is set in a bitvec structure (variable pDone in the
** implementation below). This is used to ensure that a page is only
** rolled back the first time it is encountered in either journal.
**
** If pSavepoint is NULL, then pages are only played back from the main
** journal file. There is no need for a bitvec in this case.
**
** In either case, before playback commences the Pager.dbSize variable
** is reset to the value that it held at the start of the savepoint
** (or transaction). No page with a page-number greater than this value
** is played back. If one is encountered it is simply skipped.
*/
static int pagerPlaybackSavepoint(Pager *pPager, PagerSavepoint *pSavepoint){
i64 szJ; /* Effective size of the main journal */
i64 iHdrOff; /* End of first segment of main-journal records */
int rc = SQLITE_OK; /* Return code */
Bitvec *pDone = 0; /* Bitvec to ensure pages played back only once */
assert( pPager->eState!=PAGER_ERROR );
assert( pPager->eState>=PAGER_WRITER_LOCKED );
/* Allocate a bitvec to use to store the set of pages rolled back */
if( pSavepoint ){
pDone = sqlite3BitvecCreate(pSavepoint->nOrig);
if( !pDone ){
return SQLITE_NOMEM_BKPT;
}
}
/* Set the database size back to the value it was before the savepoint
** being reverted was opened.
*/
pPager->dbSize = pSavepoint ? pSavepoint->nOrig : pPager->dbOrigSize;
pPager->changeCountDone = pPager->tempFile;
if( !pSavepoint && pagerUseWal(pPager) ){
return pagerRollbackWal(pPager);
}
/* Use pPager->journalOff as the effective size of the main rollback
** journal. The actual file might be larger than this in
** PAGER_JOURNALMODE_TRUNCATE or PAGER_JOURNALMODE_PERSIST. But anything
** past pPager->journalOff is off-limits to us.
*/
szJ = pPager->journalOff;
assert( pagerUseWal(pPager)==0 || szJ==0 );
/* Begin by rolling back records from the main journal starting at
** PagerSavepoint.iOffset and continuing to the next journal header.
** There might be records in the main journal that have a page number
** greater than the current database size (pPager->dbSize) but those
** will be skipped automatically. Pages are added to pDone as they
** are played back.
*/
if( pSavepoint && !pagerUseWal(pPager) ){
iHdrOff = pSavepoint->iHdrOffset ? pSavepoint->iHdrOffset : szJ;
pPager->journalOff = pSavepoint->iOffset;
while( rc==SQLITE_OK && pPager->journalOff<iHdrOff ){
rc = pager_playback_one_page(pPager, &pPager->journalOff, pDone, 1, 1);
}
assert( rc!=SQLITE_DONE );
}else{
pPager->journalOff = 0;
}
/* Continue rolling back records out of the main journal starting at
** the first journal header seen and continuing until the effective end
** of the main journal file. Continue to skip out-of-range pages and
** continue adding pages rolled back to pDone.
*/
while( rc==SQLITE_OK && pPager->journalOff<szJ ){
u32 ii; /* Loop counter */
u32 nJRec = 0; /* Number of Journal Records */
u32 dummy;
rc = readJournalHdr(pPager, 0, szJ, &nJRec, &dummy);
assert( rc!=SQLITE_DONE );
/*
** The "pPager->journalHdr+JOURNAL_HDR_SZ(pPager)==pPager->journalOff"
** test is related to ticket #2565. See the discussion in the
** pager_playback() function for additional information.
*/
if( nJRec==0
&& pPager->journalHdr+JOURNAL_HDR_SZ(pPager)==pPager->journalOff
){
nJRec = (u32)((szJ - pPager->journalOff)/JOURNAL_PG_SZ(pPager));
}
for(ii=0; rc==SQLITE_OK && ii<nJRec && pPager->journalOff<szJ; ii++){
rc = pager_playback_one_page(pPager, &pPager->journalOff, pDone, 1, 1);
}
assert( rc!=SQLITE_DONE );
}
assert( rc!=SQLITE_OK || pPager->journalOff>=szJ );
/* Finally, rollback pages from the sub-journal. Page that were
** previously rolled back out of the main journal (and are hence in pDone)
** will be skipped. Out-of-range pages are also skipped.
*/
if( pSavepoint ){
u32 ii; /* Loop counter */
i64 offset = (i64)pSavepoint->iSubRec*(4+pPager->pageSize);
if( pagerUseWal(pPager) ){
rc = sqlite3WalSavepointUndo(pPager->pWal, pSavepoint->aWalData);
}
for(ii=pSavepoint->iSubRec; rc==SQLITE_OK && ii<pPager->nSubRec; ii++){
assert( offset==(i64)ii*(4+pPager->pageSize) );
rc = pager_playback_one_page(pPager, &offset, pDone, 0, 1);
}
assert( rc!=SQLITE_DONE );
}
sqlite3BitvecDestroy(pDone);
if( rc==SQLITE_OK ){
pPager->journalOff = szJ;
}
return rc;
}
/*
** Change the maximum number of in-memory pages that are allowed
** before attempting to recycle clean and unused pages.
*/
void sqlite3PagerSetCachesize(Pager *pPager, int mxPage){
sqlite3PcacheSetCachesize(pPager->pPCache, mxPage);
}
/*
** Change the maximum number of in-memory pages that are allowed
** before attempting to spill pages to journal.
*/
int sqlite3PagerSetSpillsize(Pager *pPager, int mxPage){
return sqlite3PcacheSetSpillsize(pPager->pPCache, mxPage);
}
/*
** Invoke SQLITE_FCNTL_MMAP_SIZE based on the current value of szMmap.
*/
static void pagerFixMaplimit(Pager *pPager){
#if SQLITE_MAX_MMAP_SIZE>0
sqlite3_file *fd = pPager->fd;
if( isOpen(fd) && fd->pMethods->iVersion>=3 ){
sqlite3_int64 sz;
sz = pPager->szMmap;
pPager->bUseFetch = (sz>0);
setGetterMethod(pPager);
sqlite3OsFileControlHint(pPager->fd, SQLITE_FCNTL_MMAP_SIZE, &sz);
}
#endif
}
/*
** Change the maximum size of any memory mapping made of the database file.
*/
void sqlite3PagerSetMmapLimit(Pager *pPager, sqlite3_int64 szMmap){
pPager->szMmap = szMmap;
pagerFixMaplimit(pPager);
}
/*
** Free as much memory as possible from the pager.
*/
void sqlite3PagerShrink(Pager *pPager){
sqlite3PcacheShrink(pPager->pPCache);
}
/*
** Adjust settings of the pager to those specified in the pgFlags parameter.
**
** The "level" in pgFlags & PAGER_SYNCHRONOUS_MASK sets the robustness
** of the database to damage due to OS crashes or power failures by
** changing the number of syncs()s when writing the journals.
** There are four levels:
**
** OFF sqlite3OsSync() is never called. This is the default
** for temporary and transient files.
**
** NORMAL The journal is synced once before writes begin on the
** database. This is normally adequate protection, but
** it is theoretically possible, though very unlikely,
** that an inopertune power failure could leave the journal
** in a state which would cause damage to the database
** when it is rolled back.
**
** FULL The journal is synced twice before writes begin on the
** database (with some additional information - the nRec field
** of the journal header - being written in between the two
** syncs). If we assume that writing a
** single disk sector is atomic, then this mode provides
** assurance that the journal will not be corrupted to the
** point of causing damage to the database during rollback.
**
** EXTRA This is like FULL except that is also syncs the directory
** that contains the rollback journal after the rollback
** journal is unlinked.
**
** The above is for a rollback-journal mode. For WAL mode, OFF continues
** to mean that no syncs ever occur. NORMAL means that the WAL is synced
** prior to the start of checkpoint and that the database file is synced
** at the conclusion of the checkpoint if the entire content of the WAL
** was written back into the database. But no sync operations occur for
** an ordinary commit in NORMAL mode with WAL. FULL means that the WAL
** file is synced following each commit operation, in addition to the
** syncs associated with NORMAL. There is no difference between FULL
** and EXTRA for WAL mode.
**
** Do not confuse synchronous=FULL with SQLITE_SYNC_FULL. The
** SQLITE_SYNC_FULL macro means to use the MacOSX-style full-fsync
** using fcntl(F_FULLFSYNC). SQLITE_SYNC_NORMAL means to do an
** ordinary fsync() call. There is no difference between SQLITE_SYNC_FULL
** and SQLITE_SYNC_NORMAL on platforms other than MacOSX. But the
** synchronous=FULL versus synchronous=NORMAL setting determines when
** the xSync primitive is called and is relevant to all platforms.
**
** Numeric values associated with these states are OFF==1, NORMAL=2,
** and FULL=3.
*/
#ifndef SQLITE_OMIT_PAGER_PRAGMAS
void sqlite3PagerSetFlags(
Pager *pPager, /* The pager to set safety level for */
unsigned pgFlags /* Various flags */
){
unsigned level = pgFlags & PAGER_SYNCHRONOUS_MASK;
if( pPager->tempFile ){
pPager->noSync = 1;
pPager->fullSync = 0;
pPager->extraSync = 0;
}else{
pPager->noSync = level==PAGER_SYNCHRONOUS_OFF ?1:0;
pPager->fullSync = level>=PAGER_SYNCHRONOUS_FULL ?1:0;
pPager->extraSync = level==PAGER_SYNCHRONOUS_EXTRA ?1:0;
}
if( pPager->noSync ){
pPager->syncFlags = 0;
}else if( pgFlags & PAGER_FULLFSYNC ){
pPager->syncFlags = SQLITE_SYNC_FULL;
}else{
pPager->syncFlags = SQLITE_SYNC_NORMAL;
}
pPager->walSyncFlags = (pPager->syncFlags<<2);
if( pPager->fullSync ){
pPager->walSyncFlags |= pPager->syncFlags;
}
if( (pgFlags & PAGER_CKPT_FULLFSYNC) && !pPager->noSync ){
pPager->walSyncFlags |= (SQLITE_SYNC_FULL<<2);
}
if( pgFlags & PAGER_CACHESPILL ){
pPager->doNotSpill &= ~SPILLFLAG_OFF;
}else{
pPager->doNotSpill |= SPILLFLAG_OFF;
}
}
#endif
/*
** The following global variable is incremented whenever the library
** attempts to open a temporary file. This information is used for
** testing and analysis only.
*/
#ifdef SQLITE_TEST
int sqlite3_opentemp_count = 0;
#endif
/*
** Open a temporary file.
**
** Write the file descriptor into *pFile. Return SQLITE_OK on success
** or some other error code if we fail. The OS will automatically
** delete the temporary file when it is closed.
**
** The flags passed to the VFS layer xOpen() call are those specified
** by parameter vfsFlags ORed with the following:
**
** SQLITE_OPEN_READWRITE
** SQLITE_OPEN_CREATE
** SQLITE_OPEN_EXCLUSIVE
** SQLITE_OPEN_DELETEONCLOSE
*/
static int pagerOpentemp(
Pager *pPager, /* The pager object */
sqlite3_file *pFile, /* Write the file descriptor here */
int vfsFlags /* Flags passed through to the VFS */
){
int rc; /* Return code */
#ifdef SQLITE_TEST
sqlite3_opentemp_count++; /* Used for testing and analysis only */
#endif
vfsFlags |= SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE |
SQLITE_OPEN_EXCLUSIVE | SQLITE_OPEN_DELETEONCLOSE;
rc = sqlite3OsOpen(pPager->pVfs, 0, pFile, vfsFlags, 0);
assert( rc!=SQLITE_OK || isOpen(pFile) );
return rc;
}
/*
** Set the busy handler function.
**
** The pager invokes the busy-handler if sqlite3OsLock() returns
** SQLITE_BUSY when trying to upgrade from no-lock to a SHARED lock,
** or when trying to upgrade from a RESERVED lock to an EXCLUSIVE
** lock. It does *not* invoke the busy handler when upgrading from
** SHARED to RESERVED, or when upgrading from SHARED to EXCLUSIVE
** (which occurs during hot-journal rollback). Summary:
**
** Transition | Invokes xBusyHandler
** --------------------------------------------------------
** NO_LOCK -> SHARED_LOCK | Yes
** SHARED_LOCK -> RESERVED_LOCK | No
** SHARED_LOCK -> EXCLUSIVE_LOCK | No
** RESERVED_LOCK -> EXCLUSIVE_LOCK | Yes
**
** If the busy-handler callback returns non-zero, the lock is
** retried. If it returns zero, then the SQLITE_BUSY error is
** returned to the caller of the pager API function.
*/
void sqlite3PagerSetBusyHandler(
Pager *pPager, /* Pager object */
int (*xBusyHandler)(void *), /* Pointer to busy-handler function */
void *pBusyHandlerArg /* Argument to pass to xBusyHandler */
){
void **ap;
pPager->xBusyHandler = xBusyHandler;
pPager->pBusyHandlerArg = pBusyHandlerArg;
ap = (void **)&pPager->xBusyHandler;
assert( ((int(*)(void *))(ap[0]))==xBusyHandler );
assert( ap[1]==pBusyHandlerArg );
sqlite3OsFileControlHint(pPager->fd, SQLITE_FCNTL_BUSYHANDLER, (void *)ap);
}
/*
** Change the page size used by the Pager object. The new page size
** is passed in *pPageSize.
**
** If the pager is in the error state when this function is called, it
** is a no-op. The value returned is the error state error code (i.e.
** one of SQLITE_IOERR, an SQLITE_IOERR_xxx sub-code or SQLITE_FULL).
**
** Otherwise, if all of the following are true:
**
** * the new page size (value of *pPageSize) is valid (a power
** of two between 512 and SQLITE_MAX_PAGE_SIZE, inclusive), and
**
** * there are no outstanding page references, and
**
** * the database is either not an in-memory database or it is
** an in-memory database that currently consists of zero pages.
**
** then the pager object page size is set to *pPageSize.
**
** If the page size is changed, then this function uses sqlite3PagerMalloc()
** to obtain a new Pager.pTmpSpace buffer. If this allocation attempt
** fails, SQLITE_NOMEM is returned and the page size remains unchanged.
** In all other cases, SQLITE_OK is returned.
**
** If the page size is not changed, either because one of the enumerated
** conditions above is not true, the pager was in error state when this
** function was called, or because the memory allocation attempt failed,
** then *pPageSize is set to the old, retained page size before returning.
*/
int sqlite3PagerSetPagesize(Pager *pPager, u32 *pPageSize, int nReserve){
int rc = SQLITE_OK;
/* It is not possible to do a full assert_pager_state() here, as this
** function may be called from within PagerOpen(), before the state
** of the Pager object is internally consistent.
**
** At one point this function returned an error if the pager was in
** PAGER_ERROR state. But since PAGER_ERROR state guarantees that
** there is at least one outstanding page reference, this function
** is a no-op for that case anyhow.
*/
u32 pageSize = *pPageSize;
assert( pageSize==0 || (pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE) );
if( (pPager->memDb==0 || pPager->dbSize==0)
&& sqlite3PcacheRefCount(pPager->pPCache)==0
&& pageSize && pageSize!=(u32)pPager->pageSize
){
char *pNew = NULL; /* New temp space */
i64 nByte = 0;
if( pPager->eState>PAGER_OPEN && isOpen(pPager->fd) ){
rc = sqlite3OsFileSize(pPager->fd, &nByte);
}
if( rc==SQLITE_OK ){
/* 8 bytes of zeroed overrun space is sufficient so that the b-tree
* cell header parser will never run off the end of the allocation */
pNew = (char *)sqlite3PageMalloc(pageSize+8);
if( !pNew ){
rc = SQLITE_NOMEM_BKPT;
}else{
memset(pNew+pageSize, 0, 8);
}
}
if( rc==SQLITE_OK ){
pager_reset(pPager);
rc = sqlite3PcacheSetPageSize(pPager->pPCache, pageSize);
}
if( rc==SQLITE_OK ){
sqlite3PageFree(pPager->pTmpSpace);
pPager->pTmpSpace = pNew;
pPager->dbSize = (Pgno)((nByte+pageSize-1)/pageSize);
pPager->pageSize = pageSize;
pPager->lckPgno = (Pgno)(PENDING_BYTE/pageSize) + 1;
}else{
sqlite3PageFree(pNew);
}
}
*pPageSize = pPager->pageSize;
if( rc==SQLITE_OK ){
if( nReserve<0 ) nReserve = pPager->nReserve;
assert( nReserve>=0 && nReserve<1000 );
pPager->nReserve = (i16)nReserve;
pagerFixMaplimit(pPager);
}
return rc;
}
/*
** Return a pointer to the "temporary page" buffer held internally
** by the pager. This is a buffer that is big enough to hold the
** entire content of a database page. This buffer is used internally
** during rollback and will be overwritten whenever a rollback
** occurs. But other modules are free to use it too, as long as
** no rollbacks are happening.
*/
void *sqlite3PagerTempSpace(Pager *pPager){
return pPager->pTmpSpace;
}
/*
** Attempt to set the maximum database page count if mxPage is positive.
** Make no changes if mxPage is zero or negative. And never reduce the
** maximum page count below the current size of the database.
**
** Regardless of mxPage, return the current maximum page count.
*/
Pgno sqlite3PagerMaxPageCount(Pager *pPager, Pgno mxPage){
if( mxPage>0 ){
pPager->mxPgno = mxPage;
}
assert( pPager->eState!=PAGER_OPEN ); /* Called only by OP_MaxPgcnt */
/* assert( pPager->mxPgno>=pPager->dbSize ); */
/* OP_MaxPgcnt ensures that the parameter passed to this function is not
** less than the total number of valid pages in the database. But this
** may be less than Pager.dbSize, and so the assert() above is not valid */
return pPager->mxPgno;
}
/*
** The following set of routines are used to disable the simulated
** I/O error mechanism. These routines are used to avoid simulated
** errors in places where we do not care about errors.
**
** Unless -DSQLITE_TEST=1 is used, these routines are all no-ops
** and generate no code.
*/
#ifdef SQLITE_TEST
extern int sqlite3_io_error_pending;
extern int sqlite3_io_error_hit;
static int saved_cnt;
void disable_simulated_io_errors(void){
saved_cnt = sqlite3_io_error_pending;
sqlite3_io_error_pending = -1;
}
void enable_simulated_io_errors(void){
sqlite3_io_error_pending = saved_cnt;
}
#else
# define disable_simulated_io_errors()
# define enable_simulated_io_errors()
#endif
/*
** Read the first N bytes from the beginning of the file into memory
** that pDest points to.
**
** If the pager was opened on a transient file (zFilename==""), or
** opened on a file less than N bytes in size, the output buffer is
** zeroed and SQLITE_OK returned. The rationale for this is that this
** function is used to read database headers, and a new transient or
** zero sized database has a header than consists entirely of zeroes.
**
** If any IO error apart from SQLITE_IOERR_SHORT_READ is encountered,
** the error code is returned to the caller and the contents of the
** output buffer undefined.
*/
int sqlite3PagerReadFileheader(Pager *pPager, int N, unsigned char *pDest){
int rc = SQLITE_OK;
memset(pDest, 0, N);
assert( isOpen(pPager->fd) || pPager->tempFile );
/* This routine is only called by btree immediately after creating
** the Pager object. There has not been an opportunity to transition
** to WAL mode yet.
*/
assert( !pagerUseWal(pPager) );
if( isOpen(pPager->fd) ){
IOTRACE(("DBHDR %p 0 %d\n", pPager, N))
rc = sqlite3OsRead(pPager->fd, pDest, N, 0);
if( rc==SQLITE_IOERR_SHORT_READ ){
rc = SQLITE_OK;
}
}
return rc;
}
/*
** This function may only be called when a read-transaction is open on
** the pager. It returns the total number of pages in the database.
**
** However, if the file is between 1 and <page-size> bytes in size, then
** this is considered a 1 page file.
*/
void sqlite3PagerPagecount(Pager *pPager, int *pnPage){
assert( pPager->eState>=PAGER_READER );
assert( pPager->eState!=PAGER_WRITER_FINISHED );
*pnPage = (int)pPager->dbSize;
}
/*
** Try to obtain a lock of type locktype on the database file. If
** a similar or greater lock is already held, this function is a no-op
** (returning SQLITE_OK immediately).
**
** Otherwise, attempt to obtain the lock using sqlite3OsLock(). Invoke
** the busy callback if the lock is currently not available. Repeat
** until the busy callback returns false or until the attempt to
** obtain the lock succeeds.
**
** Return SQLITE_OK on success and an error code if we cannot obtain
** the lock. If the lock is obtained successfully, set the Pager.state
** variable to locktype before returning.
*/
static int pager_wait_on_lock(Pager *pPager, int locktype){
int rc; /* Return code */
/* Check that this is either a no-op (because the requested lock is
** already held), or one of the transitions that the busy-handler
** may be invoked during, according to the comment above
** sqlite3PagerSetBusyhandler().
*/
assert( (pPager->eLock>=locktype)
|| (pPager->eLock==NO_LOCK && locktype==SHARED_LOCK)
|| (pPager->eLock==RESERVED_LOCK && locktype==EXCLUSIVE_LOCK)
);
do {
rc = pagerLockDb(pPager, locktype);
}while( rc==SQLITE_BUSY && pPager->xBusyHandler(pPager->pBusyHandlerArg) );
return rc;
}
/*
** Function assertTruncateConstraint(pPager) checks that one of the
** following is true for all dirty pages currently in the page-cache:
**
** a) The page number is less than or equal to the size of the
** current database image, in pages, OR
**
** b) if the page content were written at this time, it would not
** be necessary to write the current content out to the sub-journal.
**
** If the condition asserted by this function were not true, and the
** dirty page were to be discarded from the cache via the pagerStress()
** routine, pagerStress() would not write the current page content to
** the database file. If a savepoint transaction were rolled back after
** this happened, the correct behavior would be to restore the current
** content of the page. However, since this content is not present in either
** the database file or the portion of the rollback journal and
** sub-journal rolled back the content could not be restored and the
** database image would become corrupt. It is therefore fortunate that
** this circumstance cannot arise.
*/
#if defined(SQLITE_DEBUG)
static void assertTruncateConstraintCb(PgHdr *pPg){
Pager *pPager = pPg->pPager;
assert( pPg->flags&PGHDR_DIRTY );
if( pPg->pgno>pPager->dbSize ){ /* if (a) is false */
Pgno pgno = pPg->pgno;
int i;
for(i=0; i<pPg->pPager->nSavepoint; i++){
PagerSavepoint *p = &pPager->aSavepoint[i];
assert( p->nOrig<pgno || sqlite3BitvecTestNotNull(p->pInSavepoint,pgno) );
}
}
}
static void assertTruncateConstraint(Pager *pPager){
sqlite3PcacheIterateDirty(pPager->pPCache, assertTruncateConstraintCb);
}
#else
# define assertTruncateConstraint(pPager)
#endif
/*
** Truncate the in-memory database file image to nPage pages. This
** function does not actually modify the database file on disk. It
** just sets the internal state of the pager object so that the
** truncation will be done when the current transaction is committed.
**
** This function is only called right before committing a transaction.
** Once this function has been called, the transaction must either be
** rolled back or committed. It is not safe to call this function and
** then continue writing to the database.
*/
void sqlite3PagerTruncateImage(Pager *pPager, Pgno nPage){
assert( pPager->dbSize>=nPage || CORRUPT_DB );
assert( pPager->eState>=PAGER_WRITER_CACHEMOD );
pPager->dbSize = nPage;
/* At one point the code here called assertTruncateConstraint() to
** ensure that all pages being truncated away by this operation are,
** if one or more savepoints are open, present in the savepoint
** journal so that they can be restored if the savepoint is rolled
** back. This is no longer necessary as this function is now only
** called right before committing a transaction. So although the
** Pager object may still have open savepoints (Pager.nSavepoint!=0),
** they cannot be rolled back. So the assertTruncateConstraint() call
** is no longer correct. */
}
/*
** This function is called before attempting a hot-journal rollback. It
** syncs the journal file to disk, then sets pPager->journalHdr to the
** size of the journal file so that the pager_playback() routine knows
** that the entire journal file has been synced.
**
** Syncing a hot-journal to disk before attempting to roll it back ensures
** that if a power-failure occurs during the rollback, the process that
** attempts rollback following system recovery sees the same journal
** content as this process.
**
** If everything goes as planned, SQLITE_OK is returned. Otherwise,
** an SQLite error code.
*/
static int pagerSyncHotJournal(Pager *pPager){
int rc = SQLITE_OK;
if( !pPager->noSync ){
rc = sqlite3OsSync(pPager->jfd, SQLITE_SYNC_NORMAL);
}
if( rc==SQLITE_OK ){
rc = sqlite3OsFileSize(pPager->jfd, &pPager->journalHdr);
}
return rc;
}
#if SQLITE_MAX_MMAP_SIZE>0
/*
** Obtain a reference to a memory mapped page object for page number pgno.
** The new object will use the pointer pData, obtained from xFetch().
** If successful, set *ppPage to point to the new page reference
** and return SQLITE_OK. Otherwise, return an SQLite error code and set
** *ppPage to zero.
**
** Page references obtained by calling this function should be released
** by calling pagerReleaseMapPage().
*/
static int pagerAcquireMapPage(
Pager *pPager, /* Pager object */
Pgno pgno, /* Page number */
void *pData, /* xFetch()'d data for this page */
PgHdr **ppPage /* OUT: Acquired page object */
){
PgHdr *p; /* Memory mapped page to return */
if( pPager->pMmapFreelist ){
*ppPage = p = pPager->pMmapFreelist;
pPager->pMmapFreelist = p->pDirty;
p->pDirty = 0;
assert( pPager->nExtra>=8 );
memset(p->pExtra, 0, 8);
}else{
*ppPage = p = (PgHdr *)sqlite3MallocZero(sizeof(PgHdr) + pPager->nExtra);
if( p==0 ){
sqlite3OsUnfetch(pPager->fd, (i64)(pgno-1) * pPager->pageSize, pData);
return SQLITE_NOMEM_BKPT;
}
p->pExtra = (void *)&p[1];
p->flags = PGHDR_MMAP;
p->nRef = 1;
p->pPager = pPager;
}
assert( p->pExtra==(void *)&p[1] );
assert( p->pPage==0 );
assert( p->flags==PGHDR_MMAP );
assert( p->pPager==pPager );
assert( p->nRef==1 );
p->pgno = pgno;
p->pData = pData;
pPager->nMmapOut++;
return SQLITE_OK;
}
#endif
/*
** Release a reference to page pPg. pPg must have been returned by an
** earlier call to pagerAcquireMapPage().
*/
static void pagerReleaseMapPage(PgHdr *pPg){
Pager *pPager = pPg->pPager;
pPager->nMmapOut--;
pPg->pDirty = pPager->pMmapFreelist;
pPager->pMmapFreelist = pPg;
assert( pPager->fd->pMethods->iVersion>=3 );
sqlite3OsUnfetch(pPager->fd, (i64)(pPg->pgno-1)*pPager->pageSize, pPg->pData);
}
/*
** Free all PgHdr objects stored in the Pager.pMmapFreelist list.
*/
static void pagerFreeMapHdrs(Pager *pPager){
PgHdr *p;
PgHdr *pNext;
for(p=pPager->pMmapFreelist; p; p=pNext){
pNext = p->pDirty;
sqlite3_free(p);
}
}
/* Verify that the database file has not be deleted or renamed out from
** under the pager. Return SQLITE_OK if the database is still where it ought
** to be on disk. Return non-zero (SQLITE_READONLY_DBMOVED or some other error
** code from sqlite3OsAccess()) if the database has gone missing.
*/
static int databaseIsUnmoved(Pager *pPager){
int bHasMoved = 0;
int rc;
if( pPager->tempFile ) return SQLITE_OK;
if( pPager->dbSize==0 ) return SQLITE_OK;
assert( pPager->zFilename && pPager->zFilename[0] );
rc = sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_HAS_MOVED, &bHasMoved);
if( rc==SQLITE_NOTFOUND ){
/* If the HAS_MOVED file-control is unimplemented, assume that the file
** has not been moved. That is the historical behavior of SQLite: prior to
** version 3.8.3, it never checked */
rc = SQLITE_OK;
}else if( rc==SQLITE_OK && bHasMoved ){
rc = SQLITE_READONLY_DBMOVED;
}
return rc;
}
/*
** Shutdown the page cache. Free all memory and close all files.
**
** If a transaction was in progress when this routine is called, that
** transaction is rolled back. All outstanding pages are invalidated
** and their memory is freed. Any attempt to use a page associated
** with this page cache after this function returns will likely
** result in a coredump.
**
** This function always succeeds. If a transaction is active an attempt
** is made to roll it back. If an error occurs during the rollback
** a hot journal may be left in the filesystem but no error is returned
** to the caller.
*/
int sqlite3PagerClose(Pager *pPager, sqlite3 *db){
u8 *pTmp = (u8*)pPager->pTmpSpace;
assert( db || pagerUseWal(pPager)==0 );
assert( assert_pager_state(pPager) );
disable_simulated_io_errors();
sqlite3BeginBenignMalloc();
pagerFreeMapHdrs(pPager);
/* pPager->errCode = 0; */
pPager->exclusiveMode = 0;
#ifndef SQLITE_OMIT_WAL
{
u8 *a = 0;
assert( db || pPager->pWal==0 );
if( db && 0==(db->flags & SQLITE_NoCkptOnClose)
&& SQLITE_OK==databaseIsUnmoved(pPager)
){
a = pTmp;
}
sqlite3WalClose(pPager->pWal, db, pPager->walSyncFlags, pPager->pageSize,a);
pPager->pWal = 0;
}
#endif
pager_reset(pPager);
if( MEMDB ){
pager_unlock(pPager);
}else{
/* If it is open, sync the journal file before calling UnlockAndRollback.
** If this is not done, then an unsynced portion of the open journal
** file may be played back into the database. If a power failure occurs
** while this is happening, the database could become corrupt.
**
** If an error occurs while trying to sync the journal, shift the pager
** into the ERROR state. This causes UnlockAndRollback to unlock the
** database and close the journal file without attempting to roll it
** back or finalize it. The next database user will have to do hot-journal
** rollback before accessing the database file.
*/
if( isOpen(pPager->jfd) ){
pager_error(pPager, pagerSyncHotJournal(pPager));
}
pagerUnlockAndRollback(pPager);
}
sqlite3EndBenignMalloc();
enable_simulated_io_errors();
PAGERTRACE(("CLOSE %d\n", PAGERID(pPager)));
IOTRACE(("CLOSE %p\n", pPager))
sqlite3OsClose(pPager->jfd);
sqlite3OsClose(pPager->fd);
sqlite3PageFree(pTmp);
sqlite3PcacheClose(pPager->pPCache);
assert( !pPager->aSavepoint && !pPager->pInJournal );
assert( !isOpen(pPager->jfd) && !isOpen(pPager->sjfd) );
sqlite3_free(pPager);
return SQLITE_OK;
}
#if !defined(NDEBUG) || defined(SQLITE_TEST)
/*
** Return the page number for page pPg.
*/
Pgno sqlite3PagerPagenumber(DbPage *pPg){
return pPg->pgno;
}
#endif
/*
** Increment the reference count for page pPg.
*/
void sqlite3PagerRef(DbPage *pPg){
sqlite3PcacheRef(pPg);
}
/*
** Sync the journal. In other words, make sure all the pages that have
** been written to the journal have actually reached the surface of the
** disk and can be restored in the event of a hot-journal rollback.
**
** If the Pager.noSync flag is set, then this function is a no-op.
** Otherwise, the actions required depend on the journal-mode and the
** device characteristics of the file-system, as follows:
**
** * If the journal file is an in-memory journal file, no action need
** be taken.
**
** * Otherwise, if the device does not support the SAFE_APPEND property,
** then the nRec field of the most recently written journal header
** is updated to contain the number of journal records that have
** been written following it. If the pager is operating in full-sync
** mode, then the journal file is synced before this field is updated.
**
** * If the device does not support the SEQUENTIAL property, then
** journal file is synced.
**
** Or, in pseudo-code:
**
** if( NOT <in-memory journal> ){
** if( NOT SAFE_APPEND ){
** if( <full-sync mode> ) xSync(<journal file>);
** <update nRec field>
** }
** if( NOT SEQUENTIAL ) xSync(<journal file>);
** }
**
** If successful, this routine clears the PGHDR_NEED_SYNC flag of every
** page currently held in memory before returning SQLITE_OK. If an IO
** error is encountered, then the IO error code is returned to the caller.
*/
static int syncJournal(Pager *pPager, int newHdr){
int rc; /* Return code */
assert( pPager->eState==PAGER_WRITER_CACHEMOD
|| pPager->eState==PAGER_WRITER_DBMOD
);
assert( assert_pager_state(pPager) );
assert( !pagerUseWal(pPager) );
rc = sqlite3PagerExclusiveLock(pPager);
if( rc!=SQLITE_OK ) return rc;
if( !pPager->noSync ){
assert( !pPager->tempFile );
if( isOpen(pPager->jfd) && pPager->journalMode!=PAGER_JOURNALMODE_MEMORY ){
const int iDc = sqlite3OsDeviceCharacteristics(pPager->fd);
assert( isOpen(pPager->jfd) );
if( 0==(iDc&SQLITE_IOCAP_SAFE_APPEND) ){
/* This block deals with an obscure problem. If the last connection
** that wrote to this database was operating in persistent-journal
** mode, then the journal file may at this point actually be larger
** than Pager.journalOff bytes. If the next thing in the journal
** file happens to be a journal-header (written as part of the
** previous connection's transaction), and a crash or power-failure
** occurs after nRec is updated but before this connection writes
** anything else to the journal file (or commits/rolls back its
** transaction), then SQLite may become confused when doing the
** hot-journal rollback following recovery. It may roll back all
** of this connections data, then proceed to rolling back the old,
** out-of-date data that follows it. Database corruption.
**
** To work around this, if the journal file does appear to contain
** a valid header following Pager.journalOff, then write a 0x00
** byte to the start of it to prevent it from being recognized.
**
** Variable iNextHdrOffset is set to the offset at which this
** problematic header will occur, if it exists. aMagic is used
** as a temporary buffer to inspect the first couple of bytes of
** the potential journal header.
*/
i64 iNextHdrOffset;
u8 aMagic[8];
u8 zHeader[sizeof(aJournalMagic)+4];
memcpy(zHeader, aJournalMagic, sizeof(aJournalMagic));
put32bits(&zHeader[sizeof(aJournalMagic)], pPager->nRec);
iNextHdrOffset = journalHdrOffset(pPager);
rc = sqlite3OsRead(pPager->jfd, aMagic, 8, iNextHdrOffset);
if( rc==SQLITE_OK && 0==memcmp(aMagic, aJournalMagic, 8) ){
static const u8 zerobyte = 0;
rc = sqlite3OsWrite(pPager->jfd, &zerobyte, 1, iNextHdrOffset);
}
if( rc!=SQLITE_OK && rc!=SQLITE_IOERR_SHORT_READ ){
return rc;
}
/* Write the nRec value into the journal file header. If in
** full-synchronous mode, sync the journal first. This ensures that
** all data has really hit the disk before nRec is updated to mark
** it as a candidate for rollback.
**
** This is not required if the persistent media supports the
** SAFE_APPEND property. Because in this case it is not possible
** for garbage data to be appended to the file, the nRec field
** is populated with 0xFFFFFFFF when the journal header is written
** and never needs to be updated.
*/
if( pPager->fullSync && 0==(iDc&SQLITE_IOCAP_SEQUENTIAL) ){
PAGERTRACE(("SYNC journal of %d\n", PAGERID(pPager)));
IOTRACE(("JSYNC %p\n", pPager))
rc = sqlite3OsSync(pPager->jfd, pPager->syncFlags);
if( rc!=SQLITE_OK ) return rc;
}
IOTRACE(("JHDR %p %lld\n", pPager, pPager->journalHdr));
rc = sqlite3OsWrite(
pPager->jfd, zHeader, sizeof(zHeader), pPager->journalHdr
);
if( rc!=SQLITE_OK ) return rc;
}
if( 0==(iDc&SQLITE_IOCAP_SEQUENTIAL) ){
PAGERTRACE(("SYNC journal of %d\n", PAGERID(pPager)));
IOTRACE(("JSYNC %p\n", pPager))
rc = sqlite3OsSync(pPager->jfd, pPager->syncFlags|
(pPager->syncFlags==SQLITE_SYNC_FULL?SQLITE_SYNC_DATAONLY:0)
);
if( rc!=SQLITE_OK ) return rc;
}
pPager->journalHdr = pPager->journalOff;
if( newHdr && 0==(iDc&SQLITE_IOCAP_SAFE_APPEND) ){
pPager->nRec = 0;
rc = writeJournalHdr(pPager);
if( rc!=SQLITE_OK ) return rc;
}
}else{
pPager->journalHdr = pPager->journalOff;
}
}
/* Unless the pager is in noSync mode, the journal file was just
** successfully synced. Either way, clear the PGHDR_NEED_SYNC flag on
** all pages.
*/
sqlite3PcacheClearSyncFlags(pPager->pPCache);
pPager->eState = PAGER_WRITER_DBMOD;
assert( assert_pager_state(pPager) );
return SQLITE_OK;
}
/*
** The argument is the first in a linked list of dirty pages connected
** by the PgHdr.pDirty pointer. This function writes each one of the
** in-memory pages in the list to the database file. The argument may
** be NULL, representing an empty list. In this case this function is
** a no-op.
**
** The pager must hold at least a RESERVED lock when this function
** is called. Before writing anything to the database file, this lock
** is upgraded to an EXCLUSIVE lock. If the lock cannot be obtained,
** SQLITE_BUSY is returned and no data is written to the database file.
**
** If the pager is a temp-file pager and the actual file-system file
** is not yet open, it is created and opened before any data is
** written out.
**
** Once the lock has been upgraded and, if necessary, the file opened,
** the pages are written out to the database file in list order. Writing
** a page is skipped if it meets either of the following criteria:
**
** * The page number is greater than Pager.dbSize, or
** * The PGHDR_DONT_WRITE flag is set on the page.
**
** If writing out a page causes the database file to grow, Pager.dbFileSize
** is updated accordingly. If page 1 is written out, then the value cached
** in Pager.dbFileVers[] is updated to match the new value stored in
** the database file.
**
** If everything is successful, SQLITE_OK is returned. If an IO error
** occurs, an IO error code is returned. Or, if the EXCLUSIVE lock cannot
** be obtained, SQLITE_BUSY is returned.
*/
static int pager_write_pagelist(Pager *pPager, PgHdr *pList){
int rc = SQLITE_OK; /* Return code */
/* This function is only called for rollback pagers in WRITER_DBMOD state. */
assert( !pagerUseWal(pPager) );
assert( pPager->tempFile || pPager->eState==PAGER_WRITER_DBMOD );
assert( pPager->eLock==EXCLUSIVE_LOCK );
assert( isOpen(pPager->fd) || pList->pDirty==0 );
/* If the file is a temp-file has not yet been opened, open it now. It
** is not possible for rc to be other than SQLITE_OK if this branch
** is taken, as pager_wait_on_lock() is a no-op for temp-files.
*/
if( !isOpen(pPager->fd) ){
assert( pPager->tempFile && rc==SQLITE_OK );
rc = pagerOpentemp(pPager, pPager->fd, pPager->vfsFlags);
}
/* Before the first write, give the VFS a hint of what the final
** file size will be.
*/
assert( rc!=SQLITE_OK || isOpen(pPager->fd) );
if( rc==SQLITE_OK
&& pPager->dbHintSize<pPager->dbSize
&& (pList->pDirty || pList->pgno>pPager->dbHintSize)
){
sqlite3_int64 szFile = pPager->pageSize * (sqlite3_int64)pPager->dbSize;
sqlite3OsFileControlHint(pPager->fd, SQLITE_FCNTL_SIZE_HINT, &szFile);
pPager->dbHintSize = pPager->dbSize;
}
while( rc==SQLITE_OK && pList ){
Pgno pgno = pList->pgno;
/* If there are dirty pages in the page cache with page numbers greater
** than Pager.dbSize, this means sqlite3PagerTruncateImage() was called to
** make the file smaller (presumably by auto-vacuum code). Do not write
** any such pages to the file.
**
** Also, do not write out any page that has the PGHDR_DONT_WRITE flag
** set (set by sqlite3PagerDontWrite()).
*/
if( pgno<=pPager->dbSize && 0==(pList->flags&PGHDR_DONT_WRITE) ){
i64 offset = (pgno-1)*(i64)pPager->pageSize; /* Offset to write */
char *pData; /* Data to write */
assert( (pList->flags&PGHDR_NEED_SYNC)==0 );
if( pList->pgno==1 ) pager_write_changecounter(pList);
pData = pList->pData;
/* Write out the page data. */
rc = sqlite3OsWrite(pPager->fd, pData, pPager->pageSize, offset);
/* If page 1 was just written, update Pager.dbFileVers to match
** the value now stored in the database file. If writing this
** page caused the database file to grow, update dbFileSize.
*/
if( pgno==1 ){
memcpy(&pPager->dbFileVers, &pData[24], sizeof(pPager->dbFileVers));
}
if( pgno>pPager->dbFileSize ){
pPager->dbFileSize = pgno;
}
pPager->aStat[PAGER_STAT_WRITE]++;
/* Update any backup objects copying the contents of this pager. */
sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)pList->pData);
PAGERTRACE(("STORE %d page %d hash(%08x)\n",
PAGERID(pPager), pgno, pager_pagehash(pList)));
IOTRACE(("PGOUT %p %d\n", pPager, pgno));
PAGER_INCR(sqlite3_pager_writedb_count);
}else{
PAGERTRACE(("NOSTORE %d page %d\n", PAGERID(pPager), pgno));
}
pager_set_pagehash(pList);
pList = pList->pDirty;
}
return rc;
}
/*
** Ensure that the sub-journal file is open. If it is already open, this
** function is a no-op.
**
** SQLITE_OK is returned if everything goes according to plan. An
** SQLITE_IOERR_XXX error code is returned if a call to sqlite3OsOpen()
** fails.
*/
static int openSubJournal(Pager *pPager){
int rc = SQLITE_OK;
if( !isOpen(pPager->sjfd) ){
const int flags = SQLITE_OPEN_SUBJOURNAL | SQLITE_OPEN_READWRITE
| SQLITE_OPEN_CREATE | SQLITE_OPEN_EXCLUSIVE
| SQLITE_OPEN_DELETEONCLOSE;
int nStmtSpill = sqlite3Config.nStmtSpill;
if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY || pPager->subjInMemory ){
nStmtSpill = -1;
}
rc = sqlite3JournalOpen(pPager->pVfs, 0, pPager->sjfd, flags, nStmtSpill);
}
return rc;
}
/*
** Append a record of the current state of page pPg to the sub-journal.
**
** If successful, set the bit corresponding to pPg->pgno in the bitvecs
** for all open savepoints before returning.
**
** This function returns SQLITE_OK if everything is successful, an IO
** error code if the attempt to write to the sub-journal fails, or
** SQLITE_NOMEM if a malloc fails while setting a bit in a savepoint
** bitvec.
*/
static int subjournalPage(PgHdr *pPg){
int rc = SQLITE_OK;
Pager *pPager = pPg->pPager;
if( pPager->journalMode!=PAGER_JOURNALMODE_OFF ){
/* Open the sub-journal, if it has not already been opened */
assert( pPager->useJournal );
assert( isOpen(pPager->jfd) || pagerUseWal(pPager) );
assert( isOpen(pPager->sjfd) || pPager->nSubRec==0 );
assert( pagerUseWal(pPager)
|| pageInJournal(pPager, pPg)
|| pPg->pgno>pPager->dbOrigSize
);
rc = openSubJournal(pPager);
/* If the sub-journal was opened successfully (or was already open),
** write the journal record into the file. */
if( rc==SQLITE_OK ){
void *pData = pPg->pData;
i64 offset = (i64)pPager->nSubRec*(4+pPager->pageSize);
char *pData2;
pData2 = pData;
PAGERTRACE(("STMT-JOURNAL %d page %d\n", PAGERID(pPager), pPg->pgno));
rc = write32bits(pPager->sjfd, offset, pPg->pgno);
if( rc==SQLITE_OK ){
rc = sqlite3OsWrite(pPager->sjfd, pData2, pPager->pageSize, offset+4);
}
}
}
if( rc==SQLITE_OK ){
pPager->nSubRec++;
assert( pPager->nSavepoint>0 );
rc = addToSavepointBitvecs(pPager, pPg->pgno);
}
return rc;
}
static int subjournalPageIfRequired(PgHdr *pPg){
if( subjRequiresPage(pPg) ){
return subjournalPage(pPg);
}else{
return SQLITE_OK;
}
}
/*
** This function is called by the pcache layer when it has reached some
** soft memory limit. The first argument is a pointer to a Pager object
** (cast as a void*). The pager is always 'purgeable' (not an in-memory
** database). The second argument is a reference to a page that is
** currently dirty but has no outstanding references. The page
** is always associated with the Pager object passed as the first
** argument.
**
** The job of this function is to make pPg clean by writing its contents
** out to the database file, if possible. This may involve syncing the
** journal file.
**
** If successful, sqlite3PcacheMakeClean() is called on the page and
** SQLITE_OK returned. If an IO error occurs while trying to make the
** page clean, the IO error code is returned. If the page cannot be
** made clean for some other reason, but no error occurs, then SQLITE_OK
** is returned by sqlite3PcacheMakeClean() is not called.
*/
static int pagerStress(void *p, PgHdr *pPg){
Pager *pPager = (Pager *)p;
int rc = SQLITE_OK;
assert( pPg->pPager==pPager );
assert( pPg->flags&PGHDR_DIRTY );
/* The doNotSpill NOSYNC bit is set during times when doing a sync of
** journal (and adding a new header) is not allowed. This occurs
** during calls to sqlite3PagerWrite() while trying to journal multiple
** pages belonging to the same sector.
**
** The doNotSpill ROLLBACK and OFF bits inhibits all cache spilling
** regardless of whether or not a sync is required. This is set during
** a rollback or by user request, respectively.
**
** Spilling is also prohibited when in an error state since that could
** lead to database corruption. In the current implementation it
** is impossible for sqlite3PcacheFetch() to be called with createFlag==3
** while in the error state, hence it is impossible for this routine to
** be called in the error state. Nevertheless, we include a NEVER()
** test for the error state as a safeguard against future changes.
*/
if( NEVER(pPager->errCode) ) return SQLITE_OK;
testcase( pPager->doNotSpill & SPILLFLAG_ROLLBACK );
testcase( pPager->doNotSpill & SPILLFLAG_OFF );
testcase( pPager->doNotSpill & SPILLFLAG_NOSYNC );
if( pPager->doNotSpill
&& ((pPager->doNotSpill & (SPILLFLAG_ROLLBACK|SPILLFLAG_OFF))!=0
|| (pPg->flags & PGHDR_NEED_SYNC)!=0)
){
return SQLITE_OK;
}
pPager->aStat[PAGER_STAT_SPILL]++;
pPg->pDirty = 0;
if( pagerUseWal(pPager) ){
/* Write a single frame for this page to the log. */
rc = subjournalPageIfRequired(pPg);
if( rc==SQLITE_OK ){
rc = pagerWalFrames(pPager, pPg, 0, 0);
}
}else{
#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
if( pPager->tempFile==0 ){
rc = sqlite3JournalCreate(pPager->jfd);
if( rc!=SQLITE_OK ) return pager_error(pPager, rc);
}
#endif
/* Sync the journal file if required. */
if( pPg->flags&PGHDR_NEED_SYNC
|| pPager->eState==PAGER_WRITER_CACHEMOD
){
rc = syncJournal(pPager, 1);
}
/* Write the contents of the page out to the database file. */
if( rc==SQLITE_OK ){
assert( (pPg->flags&PGHDR_NEED_SYNC)==0 );
rc = pager_write_pagelist(pPager, pPg);
}
}
/* Mark the page as clean. */
if( rc==SQLITE_OK ){
PAGERTRACE(("STRESS %d page %d\n", PAGERID(pPager), pPg->pgno));
sqlite3PcacheMakeClean(pPg);
}
return pager_error(pPager, rc);
}
/*
** Flush all unreferenced dirty pages to disk.
*/
int sqlite3PagerFlush(Pager *pPager){
int rc = pPager->errCode;
if( !MEMDB ){
PgHdr *pList = sqlite3PcacheDirtyList(pPager->pPCache);
assert( assert_pager_state(pPager) );
while( rc==SQLITE_OK && pList ){
PgHdr *pNext = pList->pDirty;
if( pList->nRef==0 ){
rc = pagerStress((void*)pPager, pList);
}
pList = pNext;
}
}
return rc;
}
/*
** Allocate and initialize a new Pager object and put a pointer to it
** in *ppPager. The pager should eventually be freed by passing it
** to sqlite3PagerClose().
**
** The zFilename argument is the path to the database file to open.
** If zFilename is NULL then a randomly-named temporary file is created
** and used as the file to be cached. Temporary files are be deleted
** automatically when they are closed. If zFilename is ":memory:" then
** all information is held in cache. It is never written to disk.
** This can be used to implement an in-memory database.
**
** The nExtra parameter specifies the number of bytes of space allocated
** along with each page reference. This space is available to the user
** via the sqlite3PagerGetExtra() API. When a new page is allocated, the
** first 8 bytes of this space are zeroed but the remainder is uninitialized.
** (The extra space is used by btree as the MemPage object.)
**
** The flags argument is used to specify properties that affect the
** operation of the pager. It should be passed some bitwise combination
** of the PAGER_* flags.
**
** The vfsFlags parameter is a bitmask to pass to the flags parameter
** of the xOpen() method of the supplied VFS when opening files.
**
** If the pager object is allocated and the specified file opened
** successfully, SQLITE_OK is returned and *ppPager set to point to
** the new pager object. If an error occurs, *ppPager is set to NULL
** and error code returned. This function may return SQLITE_NOMEM
** (sqlite3Malloc() is used to allocate memory), SQLITE_CANTOPEN or
** various SQLITE_IO_XXX errors.
*/
int sqlite3PagerOpen(
sqlite3_vfs *pVfs, /* The virtual file system to use */
Pager **ppPager, /* OUT: Return the Pager structure here */
const char *zFilename, /* Name of the database file to open */
int nExtra, /* Extra bytes append to each in-memory page */
int flags, /* flags controlling this file */
int vfsFlags, /* flags passed through to sqlite3_vfs.xOpen() */
void (*xReinit)(DbPage*) /* Function to reinitialize pages */
){
u8 *pPtr;
Pager *pPager = 0; /* Pager object to allocate and return */
int rc = SQLITE_OK; /* Return code */
int tempFile = 0; /* True for temp files (incl. in-memory files) */
int memDb = 0; /* True if this is an in-memory file */
#ifndef SQLITE_OMIT_DESERIALIZE
int memJM = 0; /* Memory journal mode */
#else
# define memJM 0
#endif
int readOnly = 0; /* True if this is a read-only file */
int journalFileSize; /* Bytes to allocate for each journal fd */
char *zPathname = 0; /* Full path to database file */
int nPathname = 0; /* Number of bytes in zPathname */
int useJournal = (flags & PAGER_OMIT_JOURNAL)==0; /* False to omit journal */
int pcacheSize = sqlite3PcacheSize(); /* Bytes to allocate for PCache */
u32 szPageDflt = SQLITE_DEFAULT_PAGE_SIZE; /* Default page size */
const char *zUri = 0; /* URI args to copy */
int nUriByte = 1; /* Number of bytes of URI args at *zUri */
int nUri = 0; /* Number of URI parameters */
/* Figure out how much space is required for each journal file-handle
** (there are two of them, the main journal and the sub-journal). */
journalFileSize = ROUND8(sqlite3JournalSize(pVfs));
/* Set the output variable to NULL in case an error occurs. */
*ppPager = 0;
#ifndef SQLITE_OMIT_MEMORYDB
if( flags & PAGER_MEMORY ){
memDb = 1;
if( zFilename && zFilename[0] ){
zPathname = sqlite3DbStrDup(0, zFilename);
if( zPathname==0 ) return SQLITE_NOMEM_BKPT;
nPathname = sqlite3Strlen30(zPathname);
zFilename = 0;
}
}
#endif
/* Compute and store the full pathname in an allocated buffer pointed
** to by zPathname, length nPathname. Or, if this is a temporary file,
** leave both nPathname and zPathname set to 0.
*/
if( zFilename && zFilename[0] ){
const char *z;
nPathname = pVfs->mxPathname+1;
zPathname = sqlite3DbMallocRaw(0, nPathname*2);
if( zPathname==0 ){
return SQLITE_NOMEM_BKPT;
}
zPathname[0] = 0; /* Make sure initialized even if FullPathname() fails */
rc = sqlite3OsFullPathname(pVfs, zFilename, nPathname, zPathname);
if( rc!=SQLITE_OK ){
if( rc==SQLITE_OK_SYMLINK ){
if( vfsFlags & SQLITE_OPEN_NOFOLLOW ){
rc = SQLITE_CANTOPEN_SYMLINK;
}else{
rc = SQLITE_OK;
}
}
}
nPathname = sqlite3Strlen30(zPathname);
z = zUri = &zFilename[sqlite3Strlen30(zFilename)+1];
while( *z ){
z += strlen(z)+1;
z += strlen(z)+1;
nUri++;
}
nUriByte = (int)(&z[1] - zUri);
assert( nUriByte>=1 );
if( rc==SQLITE_OK && nPathname+8>pVfs->mxPathname ){
/* This branch is taken when the journal path required by
** the database being opened will be more than pVfs->mxPathname
** bytes in length. This means the database cannot be opened,
** as it will not be possible to open the journal file or even
** check for a hot-journal before reading.
*/
rc = SQLITE_CANTOPEN_BKPT;
}
if( rc!=SQLITE_OK ){
sqlite3DbFree(0, zPathname);
return rc;
}
}
/* Allocate memory for the Pager structure, PCache object, the
** three file descriptors, the database file name and the journal
** file name. The layout in memory is as follows:
**
** Pager object (sizeof(Pager) bytes)
** PCache object (sqlite3PcacheSize() bytes)
** Database file handle (pVfs->szOsFile bytes)
** Sub-journal file handle (journalFileSize bytes)
** Main journal file handle (journalFileSize bytes)
** Ptr back to the Pager (sizeof(Pager*) bytes)
** \0\0\0\0 database prefix (4 bytes)
** Database file name (nPathname+1 bytes)
** URI query parameters (nUriByte bytes)
** Journal filename (nPathname+8+1 bytes)
** WAL filename (nPathname+4+1 bytes)
** \0\0\0 terminator (3 bytes)
**
** Some 3rd-party software, over which we have no control, depends on
** the specific order of the filenames and the \0 separators between them
** so that it can (for example) find the database filename given the WAL
** filename without using the sqlite3_filename_database() API. This is a
** misuse of SQLite and a bug in the 3rd-party software, but the 3rd-party
** software is in widespread use, so we try to avoid changing the filename
** order and formatting if possible. In particular, the details of the
** filename format expected by 3rd-party software should be as follows:
**
** - Main Database Path
** - \0
** - Multiple URI components consisting of:
** - Key
** - \0
** - Value
** - \0
** - \0
** - Journal Path
** - \0
** - WAL Path (zWALName)
** - \0
**
** The sqlite3_create_filename() interface and the databaseFilename() utility
** that is used by sqlite3_filename_database() and kin also depend on the
** specific formatting and order of the various filenames, so if the format
** changes here, be sure to change it there as well.
*/
pPtr = (u8 *)sqlite3MallocZero(
ROUND8(sizeof(*pPager)) + /* Pager structure */
ROUND8(pcacheSize) + /* PCache object */
ROUND8(pVfs->szOsFile) + /* The main db file */
journalFileSize * 2 + /* The two journal files */
sizeof(pPager) + /* Space to hold a pointer */
4 + /* Database prefix */
nPathname + 1 + /* database filename */
nUriByte + /* query parameters */
nPathname + 8 + 1 + /* Journal filename */
#ifndef SQLITE_OMIT_WAL
nPathname + 4 + 1 + /* WAL filename */
#endif
3 /* Terminator */
);
assert( EIGHT_BYTE_ALIGNMENT(SQLITE_INT_TO_PTR(journalFileSize)) );
if( !pPtr ){
sqlite3DbFree(0, zPathname);
return SQLITE_NOMEM_BKPT;
}
pPager = (Pager*)pPtr; pPtr += ROUND8(sizeof(*pPager));
pPager->pPCache = (PCache*)pPtr; pPtr += ROUND8(pcacheSize);
pPager->fd = (sqlite3_file*)pPtr; pPtr += ROUND8(pVfs->szOsFile);
pPager->sjfd = (sqlite3_file*)pPtr; pPtr += journalFileSize;
pPager->jfd = (sqlite3_file*)pPtr; pPtr += journalFileSize;
assert( EIGHT_BYTE_ALIGNMENT(pPager->jfd) );
memcpy(pPtr, &pPager, sizeof(pPager)); pPtr += sizeof(pPager);
/* Fill in the Pager.zFilename and pPager.zQueryParam fields */
pPtr += 4; /* Skip zero prefix */
pPager->zFilename = (char*)pPtr;
if( nPathname>0 ){
memcpy(pPtr, zPathname, nPathname); pPtr += nPathname + 1;
if( zUri ){
memcpy(pPtr, zUri, nUriByte); pPtr += nUriByte;
}else{
pPtr++;
}
}
/* Fill in Pager.zJournal */
if( nPathname>0 ){
pPager->zJournal = (char*)pPtr;
memcpy(pPtr, zPathname, nPathname); pPtr += nPathname;
memcpy(pPtr, "-journal",8); pPtr += 8 + 1;
#ifdef SQLITE_ENABLE_8_3_NAMES
sqlite3FileSuffix3(zFilename,pPager->zJournal);
pPtr = (u8*)(pPager->zJournal + sqlite3Strlen30(pPager->zJournal)+1);
#endif
}else{
pPager->zJournal = 0;
}
#ifndef SQLITE_OMIT_WAL
/* Fill in Pager.zWal */
if( nPathname>0 ){
pPager->zWal = (char*)pPtr;
memcpy(pPtr, zPathname, nPathname); pPtr += nPathname;
memcpy(pPtr, "-wal", 4); pPtr += 4 + 1;
#ifdef SQLITE_ENABLE_8_3_NAMES
sqlite3FileSuffix3(zFilename, pPager->zWal);
pPtr = (u8*)(pPager->zWal + sqlite3Strlen30(pPager->zWal)+1);
#endif
}else{
pPager->zWal = 0;
}
#endif
(void)pPtr; /* Suppress warning about unused pPtr value */
if( nPathname ) sqlite3DbFree(0, zPathname);
pPager->pVfs = pVfs;
pPager->vfsFlags = vfsFlags;
/* Open the pager file.
*/
if( zFilename && zFilename[0] ){
int fout = 0; /* VFS flags returned by xOpen() */
rc = sqlite3OsOpen(pVfs, pPager->zFilename, pPager->fd, vfsFlags, &fout);
assert( !memDb );
#ifndef SQLITE_OMIT_DESERIALIZE
pPager->memVfs = memJM = (fout&SQLITE_OPEN_MEMORY)!=0;
#endif
readOnly = (fout&SQLITE_OPEN_READONLY)!=0;
/* If the file was successfully opened for read/write access,
** choose a default page size in case we have to create the
** database file. The default page size is the maximum of:
**
** + SQLITE_DEFAULT_PAGE_SIZE,
** + The value returned by sqlite3OsSectorSize()
** + The largest page size that can be written atomically.
*/
if( rc==SQLITE_OK ){
int iDc = sqlite3OsDeviceCharacteristics(pPager->fd);
if( !readOnly ){
setSectorSize(pPager);
assert(SQLITE_DEFAULT_PAGE_SIZE<=SQLITE_MAX_DEFAULT_PAGE_SIZE);
if( szPageDflt<pPager->sectorSize ){
if( pPager->sectorSize>SQLITE_MAX_DEFAULT_PAGE_SIZE ){
szPageDflt = SQLITE_MAX_DEFAULT_PAGE_SIZE;
}else{
szPageDflt = (u32)pPager->sectorSize;
}
}
#ifdef SQLITE_ENABLE_ATOMIC_WRITE
{
int ii;
assert(SQLITE_IOCAP_ATOMIC512==(512>>8));
assert(SQLITE_IOCAP_ATOMIC64K==(65536>>8));
assert(SQLITE_MAX_DEFAULT_PAGE_SIZE<=65536);
for(ii=szPageDflt; ii<=SQLITE_MAX_DEFAULT_PAGE_SIZE; ii=ii*2){
if( iDc&(SQLITE_IOCAP_ATOMIC|(ii>>8)) ){
szPageDflt = ii;
}
}
}
#endif
}
pPager->noLock = sqlite3_uri_boolean(pPager->zFilename, "nolock", 0);
if( (iDc & SQLITE_IOCAP_IMMUTABLE)!=0
|| sqlite3_uri_boolean(pPager->zFilename, "immutable", 0) ){
vfsFlags |= SQLITE_OPEN_READONLY;
goto act_like_temp_file;
}
}
}else{
/* If a temporary file is requested, it is not opened immediately.
** In this case we accept the default page size and delay actually
** opening the file until the first call to OsWrite().
**
** This branch is also run for an in-memory database. An in-memory
** database is the same as a temp-file that is never written out to
** disk and uses an in-memory rollback journal.
**
** This branch also runs for files marked as immutable.
*/
act_like_temp_file:
tempFile = 1;
pPager->eState = PAGER_READER; /* Pretend we already have a lock */
pPager->eLock = EXCLUSIVE_LOCK; /* Pretend we are in EXCLUSIVE mode */
pPager->noLock = 1; /* Do no locking */
readOnly = (vfsFlags&SQLITE_OPEN_READONLY);
}
/* The following call to PagerSetPagesize() serves to set the value of
** Pager.pageSize and to allocate the Pager.pTmpSpace buffer.
*/
if( rc==SQLITE_OK ){
assert( pPager->memDb==0 );
rc = sqlite3PagerSetPagesize(pPager, &szPageDflt, -1);
testcase( rc!=SQLITE_OK );
}
/* Initialize the PCache object. */
if( rc==SQLITE_OK ){
nExtra = ROUND8(nExtra);
assert( nExtra>=8 && nExtra<1000 );
rc = sqlite3PcacheOpen(szPageDflt, nExtra, !memDb,
!memDb?pagerStress:0, (void *)pPager, pPager->pPCache);
}
/* If an error occurred above, free the Pager structure and close the file.
*/
if( rc!=SQLITE_OK ){
sqlite3OsClose(pPager->fd);
sqlite3PageFree(pPager->pTmpSpace);
sqlite3_free(pPager);
return rc;
}
PAGERTRACE(("OPEN %d %s\n", FILEHANDLEID(pPager->fd), pPager->zFilename));
IOTRACE(("OPEN %p %s\n", pPager, pPager->zFilename))
pPager->useJournal = (u8)useJournal;
/* pPager->stmtOpen = 0; */
/* pPager->stmtInUse = 0; */
/* pPager->nRef = 0; */
/* pPager->stmtSize = 0; */
/* pPager->stmtJSize = 0; */
/* pPager->nPage = 0; */
pPager->mxPgno = SQLITE_MAX_PAGE_COUNT;
/* pPager->state = PAGER_UNLOCK; */
/* pPager->errMask = 0; */
pPager->tempFile = (u8)tempFile;
assert( tempFile==PAGER_LOCKINGMODE_NORMAL
|| tempFile==PAGER_LOCKINGMODE_EXCLUSIVE );
assert( PAGER_LOCKINGMODE_EXCLUSIVE==1 );
pPager->exclusiveMode = (u8)tempFile;
pPager->changeCountDone = pPager->tempFile;
pPager->memDb = (u8)memDb;
pPager->readOnly = (u8)readOnly;
assert( useJournal || pPager->tempFile );
pPager->noSync = pPager->tempFile;
if( pPager->noSync ){
assert( pPager->fullSync==0 );
assert( pPager->extraSync==0 );
assert( pPager->syncFlags==0 );
assert( pPager->walSyncFlags==0 );
}else{
pPager->fullSync = 1;
pPager->extraSync = 0;
pPager->syncFlags = SQLITE_SYNC_NORMAL;
pPager->walSyncFlags = SQLITE_SYNC_NORMAL | (SQLITE_SYNC_NORMAL<<2);
}
/* pPager->pFirst = 0; */
/* pPager->pFirstSynced = 0; */
/* pPager->pLast = 0; */
pPager->nExtra = (u16)nExtra;
pPager->journalSizeLimit = SQLITE_DEFAULT_JOURNAL_SIZE_LIMIT;
assert( isOpen(pPager->fd) || tempFile );
setSectorSize(pPager);
if( !useJournal ){
pPager->journalMode = PAGER_JOURNALMODE_OFF;
}else if( memDb || memJM ){
pPager->journalMode = PAGER_JOURNALMODE_MEMORY;
}
/* pPager->xBusyHandler = 0; */
/* pPager->pBusyHandlerArg = 0; */
pPager->xReiniter = xReinit;
setGetterMethod(pPager);
/* memset(pPager->aHash, 0, sizeof(pPager->aHash)); */
/* pPager->szMmap = SQLITE_DEFAULT_MMAP_SIZE // will be set by btree.c */
*ppPager = pPager;
return SQLITE_OK;
}
/*
** Return the sqlite3_file for the main database given the name
** of the corresonding WAL or Journal name as passed into
** xOpen.
*/
sqlite3_file *sqlite3_database_file_object(const char *zName){
Pager *pPager;
while( zName[-1]!=0 || zName[-2]!=0 || zName[-3]!=0 || zName[-4]!=0 ){
zName--;
}
pPager = *(Pager**)(zName - 4 - sizeof(Pager*));
return pPager->fd;
}
/*
** This function is called after transitioning from PAGER_UNLOCK to
** PAGER_SHARED state. It tests if there is a hot journal present in
** the file-system for the given pager. A hot journal is one that
** needs to be played back. According to this function, a hot-journal
** file exists if the following criteria are met:
**
** * The journal file exists in the file system, and
** * No process holds a RESERVED or greater lock on the database file, and
** * The database file itself is greater than 0 bytes in size, and
** * The first byte of the journal file exists and is not 0x00.
**
** If the current size of the database file is 0 but a journal file
** exists, that is probably an old journal left over from a prior
** database with the same name. In this case the journal file is
** just deleted using OsDelete, *pExists is set to 0 and SQLITE_OK
** is returned.
**
** This routine does not check if there is a super-journal filename
** at the end of the file. If there is, and that super-journal file
** does not exist, then the journal file is not really hot. In this
** case this routine will return a false-positive. The pager_playback()
** routine will discover that the journal file is not really hot and
** will not roll it back.
**
** If a hot-journal file is found to exist, *pExists is set to 1 and
** SQLITE_OK returned. If no hot-journal file is present, *pExists is
** set to 0 and SQLITE_OK returned. If an IO error occurs while trying
** to determine whether or not a hot-journal file exists, the IO error
** code is returned and the value of *pExists is undefined.
*/
static int hasHotJournal(Pager *pPager, int *pExists){
sqlite3_vfs * const pVfs = pPager->pVfs;
int rc = SQLITE_OK; /* Return code */
int exists = 1; /* True if a journal file is present */
int jrnlOpen = !!isOpen(pPager->jfd);
assert( pPager->useJournal );
assert( isOpen(pPager->fd) );
assert( pPager->eState==PAGER_OPEN );
assert( jrnlOpen==0 || ( sqlite3OsDeviceCharacteristics(pPager->jfd) &
SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN
));
*pExists = 0;
if( !jrnlOpen ){
rc = sqlite3OsAccess(pVfs, pPager->zJournal, SQLITE_ACCESS_EXISTS, &exists);
}
if( rc==SQLITE_OK && exists ){
int locked = 0; /* True if some process holds a RESERVED lock */
/* Race condition here: Another process might have been holding the
** the RESERVED lock and have a journal open at the sqlite3OsAccess()
** call above, but then delete the journal and drop the lock before
** we get to the following sqlite3OsCheckReservedLock() call. If that
** is the case, this routine might think there is a hot journal when
** in fact there is none. This results in a false-positive which will
** be dealt with by the playback routine. Ticket #3883.
*/
rc = sqlite3OsCheckReservedLock(pPager->fd, &locked);
if( rc==SQLITE_OK && !locked ){
Pgno nPage; /* Number of pages in database file */
assert( pPager->tempFile==0 );
rc = pagerPagecount(pPager, &nPage);
if( rc==SQLITE_OK ){
/* If the database is zero pages in size, that means that either (1) the
** journal is a remnant from a prior database with the same name where
** the database file but not the journal was deleted, or (2) the initial
** transaction that populates a new database is being rolled back.
** In either case, the journal file can be deleted. However, take care
** not to delete the journal file if it is already open due to
** journal_mode=PERSIST.
*/
if( nPage==0 && !jrnlOpen ){
sqlite3BeginBenignMalloc();
if( pagerLockDb(pPager, RESERVED_LOCK)==SQLITE_OK ){
sqlite3OsDelete(pVfs, pPager->zJournal, 0);
if( !pPager->exclusiveMode ) pagerUnlockDb(pPager, SHARED_LOCK);
}
sqlite3EndBenignMalloc();
}else{
/* The journal file exists and no other connection has a reserved
** or greater lock on the database file. Now check that there is
** at least one non-zero bytes at the start of the journal file.
** If there is, then we consider this journal to be hot. If not,
** it can be ignored.
*/
if( !jrnlOpen ){
int f = SQLITE_OPEN_READONLY|SQLITE_OPEN_MAIN_JOURNAL;
rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, f, &f);
}
if( rc==SQLITE_OK ){
u8 first = 0;
rc = sqlite3OsRead(pPager->jfd, (void *)&first, 1, 0);
if( rc==SQLITE_IOERR_SHORT_READ ){
rc = SQLITE_OK;
}
if( !jrnlOpen ){
sqlite3OsClose(pPager->jfd);
}
*pExists = (first!=0);
}else if( rc==SQLITE_CANTOPEN ){
/* If we cannot open the rollback journal file in order to see if
** it has a zero header, that might be due to an I/O error, or
** it might be due to the race condition described above and in
** ticket #3883. Either way, assume that the journal is hot.
** This might be a false positive. But if it is, then the
** automatic journal playback and recovery mechanism will deal
** with it under an EXCLUSIVE lock where we do not need to
** worry so much with race conditions.
*/
*pExists = 1;
rc = SQLITE_OK;
}
}
}
}
}
return rc;
}
/*
** This function is called to obtain a shared lock on the database file.
** It is illegal to call sqlite3PagerGet() until after this function
** has been successfully called. If a shared-lock is already held when
** this function is called, it is a no-op.
**
** The following operations are also performed by this function.
**
** 1) If the pager is currently in PAGER_OPEN state (no lock held
** on the database file), then an attempt is made to obtain a
** SHARED lock on the database file. Immediately after obtaining
** the SHARED lock, the file-system is checked for a hot-journal,
** which is played back if present. Following any hot-journal
** rollback, the contents of the cache are validated by checking
** the 'change-counter' field of the database file header and
** discarded if they are found to be invalid.
**
** 2) If the pager is running in exclusive-mode, and there are currently
** no outstanding references to any pages, and is in the error state,
** then an attempt is made to clear the error state by discarding
** the contents of the page cache and rolling back any open journal
** file.
**
** If everything is successful, SQLITE_OK is returned. If an IO error
** occurs while locking the database, checking for a hot-journal file or
** rolling back a journal file, the IO error code is returned.
*/
int sqlite3PagerSharedLock(Pager *pPager){
int rc = SQLITE_OK; /* Return code */
/* This routine is only called from b-tree and only when there are no
** outstanding pages. This implies that the pager state should either
** be OPEN or READER. READER is only possible if the pager is or was in
** exclusive access mode. */
assert( sqlite3PcacheRefCount(pPager->pPCache)==0 );
assert( assert_pager_state(pPager) );
assert( pPager->eState==PAGER_OPEN || pPager->eState==PAGER_READER );
assert( pPager->errCode==SQLITE_OK );
if( !pagerUseWal(pPager) && pPager->eState==PAGER_OPEN ){
int bHotJournal = 1; /* True if there exists a hot journal-file */
assert( !MEMDB );
assert( pPager->tempFile==0 || pPager->eLock==EXCLUSIVE_LOCK );
rc = pager_wait_on_lock(pPager, SHARED_LOCK);
if( rc!=SQLITE_OK ){
assert( pPager->eLock==NO_LOCK || pPager->eLock==UNKNOWN_LOCK );
goto failed;
}
/* If a journal file exists, and there is no RESERVED lock on the
** database file, then it either needs to be played back or deleted.
*/
if( pPager->eLock<=SHARED_LOCK ){
rc = hasHotJournal(pPager, &bHotJournal);
}
if( rc!=SQLITE_OK ){
goto failed;
}
if( bHotJournal ){
if( pPager->readOnly ){
rc = SQLITE_READONLY_ROLLBACK;
goto failed;
}
/* Get an EXCLUSIVE lock on the database file. At this point it is
** important that a RESERVED lock is not obtained on the way to the
** EXCLUSIVE lock. If it were, another process might open the
** database file, detect the RESERVED lock, and conclude that the
** database is safe to read while this process is still rolling the
** hot-journal back.
**
** Because the intermediate RESERVED lock is not requested, any
** other process attempting to access the database file will get to
** this point in the code and fail to obtain its own EXCLUSIVE lock
** on the database file.
**
** Unless the pager is in locking_mode=exclusive mode, the lock is
** downgraded to SHARED_LOCK before this function returns.
*/
rc = pagerLockDb(pPager, EXCLUSIVE_LOCK);
if( rc!=SQLITE_OK ){
goto failed;
}
/* If it is not already open and the file exists on disk, open the
** journal for read/write access. Write access is required because
** in exclusive-access mode the file descriptor will be kept open
** and possibly used for a transaction later on. Also, write-access
** is usually required to finalize the journal in journal_mode=persist
** mode (and also for journal_mode=truncate on some systems).
**
** If the journal does not exist, it usually means that some
** other connection managed to get in and roll it back before
** this connection obtained the exclusive lock above. Or, it
** may mean that the pager was in the error-state when this
** function was called and the journal file does not exist.
*/
if( !isOpen(pPager->jfd) && pPager->journalMode!=PAGER_JOURNALMODE_OFF ){
sqlite3_vfs * const pVfs = pPager->pVfs;
int bExists; /* True if journal file exists */
rc = sqlite3OsAccess(
pVfs, pPager->zJournal, SQLITE_ACCESS_EXISTS, &bExists);
if( rc==SQLITE_OK && bExists ){
int fout = 0;
int f = SQLITE_OPEN_READWRITE|SQLITE_OPEN_MAIN_JOURNAL;
assert( !pPager->tempFile );
rc = sqlite3OsOpen(pVfs, pPager->zJournal, pPager->jfd, f, &fout);
assert( rc!=SQLITE_OK || isOpen(pPager->jfd) );
if( rc==SQLITE_OK && fout&SQLITE_OPEN_READONLY ){
rc = SQLITE_CANTOPEN_BKPT;
sqlite3OsClose(pPager->jfd);
}
}
}
/* Playback and delete the journal. Drop the database write
** lock and reacquire the read lock. Purge the cache before
** playing back the hot-journal so that we don't end up with
** an inconsistent cache. Sync the hot journal before playing
** it back since the process that crashed and left the hot journal
** probably did not sync it and we are required to always sync
** the journal before playing it back.
*/
if( isOpen(pPager->jfd) ){
assert( rc==SQLITE_OK );
rc = pagerSyncHotJournal(pPager);
if( rc==SQLITE_OK ){
rc = pager_playback(pPager, !pPager->tempFile);
pPager->eState = PAGER_OPEN;
}
}else if( !pPager->exclusiveMode ){
pagerUnlockDb(pPager, SHARED_LOCK);
}
if( rc!=SQLITE_OK ){
/* This branch is taken if an error occurs while trying to open
** or roll back a hot-journal while holding an EXCLUSIVE lock. The
** pager_unlock() routine will be called before returning to unlock
** the file. If the unlock attempt fails, then Pager.eLock must be
** set to UNKNOWN_LOCK (see the comment above the #define for
** UNKNOWN_LOCK above for an explanation).
**
** In order to get pager_unlock() to do this, set Pager.eState to
** PAGER_ERROR now. This is not actually counted as a transition
** to ERROR state in the state diagram at the top of this file,
** since we know that the same call to pager_unlock() will very
** shortly transition the pager object to the OPEN state. Calling
** assert_pager_state() would fail now, as it should not be possible
** to be in ERROR state when there are zero outstanding page
** references.
*/
pager_error(pPager, rc);
goto failed;
}
assert( pPager->eState==PAGER_OPEN );
assert( (pPager->eLock==SHARED_LOCK)
|| (pPager->exclusiveMode && pPager->eLock>SHARED_LOCK)
);
}
if( !pPager->tempFile && pPager->hasHeldSharedLock ){
/* The shared-lock has just been acquired then check to
** see if the database has been modified. If the database has changed,
** flush the cache. The hasHeldSharedLock flag prevents this from
** occurring on the very first access to a file, in order to save a
** single unnecessary sqlite3OsRead() call at the start-up.
**
** Database changes are detected by looking at 15 bytes beginning
** at offset 24 into the file. The first 4 of these 16 bytes are
** a 32-bit counter that is incremented with each change. The
** other bytes change randomly with each file change when
** a codec is in use.
**
** There is a vanishingly small chance that a change will not be
** detected. The chance of an undetected change is so small that
** it can be neglected.
*/
char dbFileVers[sizeof(pPager->dbFileVers)];
IOTRACE(("CKVERS %p %d\n", pPager, sizeof(dbFileVers)));
rc = sqlite3OsRead(pPager->fd, &dbFileVers, sizeof(dbFileVers), 24);
if( rc!=SQLITE_OK ){
if( rc!=SQLITE_IOERR_SHORT_READ ){
goto failed;
}
memset(dbFileVers, 0, sizeof(dbFileVers));
}
if( memcmp(pPager->dbFileVers, dbFileVers, sizeof(dbFileVers))!=0 ){
pager_reset(pPager);
/* Unmap the database file. It is possible that external processes
** may have truncated the database file and then extended it back
** to its original size while this process was not holding a lock.
** In this case there may exist a Pager.pMap mapping that appears
** to be the right size but is not actually valid. Avoid this
** possibility by unmapping the db here. */
if( USEFETCH(pPager) ){
sqlite3OsUnfetch(pPager->fd, 0, 0);
}
}
}
/* If there is a WAL file in the file-system, open this database in WAL
** mode. Otherwise, the following function call is a no-op.
*/
rc = pagerOpenWalIfPresent(pPager);
#ifndef SQLITE_OMIT_WAL
assert( pPager->pWal==0 || rc==SQLITE_OK );
#endif
}
if( pagerUseWal(pPager) ){
assert( rc==SQLITE_OK );
rc = pagerBeginReadTransaction(pPager);
}
if( pPager->tempFile==0 && pPager->eState==PAGER_OPEN && rc==SQLITE_OK ){
rc = pagerPagecount(pPager, &pPager->dbSize);
}
failed:
if( rc!=SQLITE_OK ){
assert( !MEMDB );
pager_unlock(pPager);
assert( pPager->eState==PAGER_OPEN );
}else{
pPager->eState = PAGER_READER;
pPager->hasHeldSharedLock = 1;
}
return rc;
}
/*
** If the reference count has reached zero, rollback any active
** transaction and unlock the pager.
**
** Except, in locking_mode=EXCLUSIVE when there is nothing to in
** the rollback journal, the unlock is not performed and there is
** nothing to rollback, so this routine is a no-op.
*/
static void pagerUnlockIfUnused(Pager *pPager){
if( sqlite3PcacheRefCount(pPager->pPCache)==0 ){
assert( pPager->nMmapOut==0 ); /* because page1 is never memory mapped */
pagerUnlockAndRollback(pPager);
}
}
/*
** The page getter methods each try to acquire a reference to a
** page with page number pgno. If the requested reference is
** successfully obtained, it is copied to *ppPage and SQLITE_OK returned.
**
** There are different implementations of the getter method depending
** on the current state of the pager.
**
** getPageNormal() -- The normal getter
** getPageError() -- Used if the pager is in an error state
** getPageMmap() -- Used if memory-mapped I/O is enabled
**
** If the requested page is already in the cache, it is returned.
** Otherwise, a new page object is allocated and populated with data
** read from the database file. In some cases, the pcache module may
** choose not to allocate a new page object and may reuse an existing
** object with no outstanding references.
**
** The extra data appended to a page is always initialized to zeros the
** first time a page is loaded into memory. If the page requested is
** already in the cache when this function is called, then the extra
** data is left as it was when the page object was last used.
**
** If the database image is smaller than the requested page or if
** the flags parameter contains the PAGER_GET_NOCONTENT bit and the
** requested page is not already stored in the cache, then no
** actual disk read occurs. In this case the memory image of the
** page is initialized to all zeros.
**
** If PAGER_GET_NOCONTENT is true, it means that we do not care about
** the contents of the page. This occurs in two scenarios:
**
** a) When reading a free-list leaf page from the database, and
**
** b) When a savepoint is being rolled back and we need to load
** a new page into the cache to be filled with the data read
** from the savepoint journal.
**
** If PAGER_GET_NOCONTENT is true, then the data returned is zeroed instead
** of being read from the database. Additionally, the bits corresponding
** to pgno in Pager.pInJournal (bitvec of pages already written to the
** journal file) and the PagerSavepoint.pInSavepoint bitvecs of any open
** savepoints are set. This means if the page is made writable at any
** point in the future, using a call to sqlite3PagerWrite(), its contents
** will not be journaled. This saves IO.
**
** The acquisition might fail for several reasons. In all cases,
** an appropriate error code is returned and *ppPage is set to NULL.
**
** See also sqlite3PagerLookup(). Both this routine and Lookup() attempt
** to find a page in the in-memory cache first. If the page is not already
** in memory, this routine goes to disk to read it in whereas Lookup()
** just returns 0. This routine acquires a read-lock the first time it
** has to go to disk, and could also playback an old journal if necessary.
** Since Lookup() never goes to disk, it never has to deal with locks
** or journal files.
*/
static int getPageNormal(
Pager *pPager, /* The pager open on the database file */
Pgno pgno, /* Page number to fetch */
DbPage **ppPage, /* Write a pointer to the page here */
int flags /* PAGER_GET_XXX flags */
){
int rc = SQLITE_OK;
PgHdr *pPg;
u8 noContent; /* True if PAGER_GET_NOCONTENT is set */
sqlite3_pcache_page *pBase;
assert( pPager->errCode==SQLITE_OK );
assert( pPager->eState>=PAGER_READER );
assert( assert_pager_state(pPager) );
assert( pPager->hasHeldSharedLock==1 );
if( pgno==0 ) return SQLITE_CORRUPT_BKPT;
pBase = sqlite3PcacheFetch(pPager->pPCache, pgno, 3);
if( pBase==0 ){
pPg = 0;
rc = sqlite3PcacheFetchStress(pPager->pPCache, pgno, &pBase);
if( rc!=SQLITE_OK ) goto pager_acquire_err;
if( pBase==0 ){
rc = SQLITE_NOMEM_BKPT;
goto pager_acquire_err;
}
}
pPg = *ppPage = sqlite3PcacheFetchFinish(pPager->pPCache, pgno, pBase);
assert( pPg==(*ppPage) );
assert( pPg->pgno==pgno );
assert( pPg->pPager==pPager || pPg->pPager==0 );
noContent = (flags & PAGER_GET_NOCONTENT)!=0;
if( pPg->pPager && !noContent ){
/* In this case the pcache already contains an initialized copy of
** the page. Return without further ado. */
assert( pgno!=PAGER_SJ_PGNO(pPager) );
pPager->aStat[PAGER_STAT_HIT]++;
return SQLITE_OK;
}else{
/* The pager cache has created a new page. Its content needs to
** be initialized. But first some error checks:
**
** (*) obsolete. Was: maximum page number is 2^31
** (2) Never try to fetch the locking page
*/
if( pgno==PAGER_SJ_PGNO(pPager) ){
rc = SQLITE_CORRUPT_BKPT;
goto pager_acquire_err;
}
pPg->pPager = pPager;
assert( !isOpen(pPager->fd) || !MEMDB );
if( !isOpen(pPager->fd) || pPager->dbSize<pgno || noContent ){
if( pgno>pPager->mxPgno ){
rc = SQLITE_FULL;
goto pager_acquire_err;
}
if( noContent ){
/* Failure to set the bits in the InJournal bit-vectors is benign.
** It merely means that we might do some extra work to journal a
** page that does not need to be journaled. Nevertheless, be sure
** to test the case where a malloc error occurs while trying to set
** a bit in a bit vector.
*/
sqlite3BeginBenignMalloc();
if( pgno<=pPager->dbOrigSize ){
TESTONLY( rc = ) sqlite3BitvecSet(pPager->pInJournal, pgno);
testcase( rc==SQLITE_NOMEM );
}
TESTONLY( rc = ) addToSavepointBitvecs(pPager, pgno);
testcase( rc==SQLITE_NOMEM );
sqlite3EndBenignMalloc();
}
memset(pPg->pData, 0, pPager->pageSize);
IOTRACE(("ZERO %p %d\n", pPager, pgno));
}else{
assert( pPg->pPager==pPager );
pPager->aStat[PAGER_STAT_MISS]++;
rc = readDbPage(pPg);
if( rc!=SQLITE_OK ){
goto pager_acquire_err;
}
}
pager_set_pagehash(pPg);
}
return SQLITE_OK;
pager_acquire_err:
assert( rc!=SQLITE_OK );
if( pPg ){
sqlite3PcacheDrop(pPg);
}
pagerUnlockIfUnused(pPager);
*ppPage = 0;
return rc;
}
#if SQLITE_MAX_MMAP_SIZE>0
/* The page getter for when memory-mapped I/O is enabled */
static int getPageMMap(
Pager *pPager, /* The pager open on the database file */
Pgno pgno, /* Page number to fetch */
DbPage **ppPage, /* Write a pointer to the page here */
int flags /* PAGER_GET_XXX flags */
){
int rc = SQLITE_OK;
PgHdr *pPg = 0;
u32 iFrame = 0; /* Frame to read from WAL file */
/* It is acceptable to use a read-only (mmap) page for any page except
** page 1 if there is no write-transaction open or the ACQUIRE_READONLY
** flag was specified by the caller. And so long as the db is not a
** temporary or in-memory database. */
const int bMmapOk = (pgno>1
&& (pPager->eState==PAGER_READER || (flags & PAGER_GET_READONLY))
);
assert( USEFETCH(pPager) );
/* Optimization note: Adding the "pgno<=1" term before "pgno==0" here
** allows the compiler optimizer to reuse the results of the "pgno>1"
** test in the previous statement, and avoid testing pgno==0 in the
** common case where pgno is large. */
if( pgno<=1 && pgno==0 ){
return SQLITE_CORRUPT_BKPT;
}
assert( pPager->eState>=PAGER_READER );
assert( assert_pager_state(pPager) );
assert( pPager->hasHeldSharedLock==1 );
assert( pPager->errCode==SQLITE_OK );
if( bMmapOk && pagerUseWal(pPager) ){
rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iFrame);
if( rc!=SQLITE_OK ){
*ppPage = 0;
return rc;
}
}
if( bMmapOk && iFrame==0 ){
void *pData = 0;
rc = sqlite3OsFetch(pPager->fd,
(i64)(pgno-1) * pPager->pageSize, pPager->pageSize, &pData
);
if( rc==SQLITE_OK && pData ){
if( pPager->eState>PAGER_READER || pPager->tempFile ){
pPg = sqlite3PagerLookup(pPager, pgno);
}
if( pPg==0 ){
rc = pagerAcquireMapPage(pPager, pgno, pData, &pPg);
}else{
sqlite3OsUnfetch(pPager->fd, (i64)(pgno-1)*pPager->pageSize, pData);
}
if( pPg ){
assert( rc==SQLITE_OK );
*ppPage = pPg;
return SQLITE_OK;
}
}
if( rc!=SQLITE_OK ){
*ppPage = 0;
return rc;
}
}
return getPageNormal(pPager, pgno, ppPage, flags);
}
#endif /* SQLITE_MAX_MMAP_SIZE>0 */
/* The page getter method for when the pager is an error state */
static int getPageError(
Pager *pPager, /* The pager open on the database file */
Pgno pgno, /* Page number to fetch */
DbPage **ppPage, /* Write a pointer to the page here */
int flags /* PAGER_GET_XXX flags */
){
UNUSED_PARAMETER(pgno);
UNUSED_PARAMETER(flags);
assert( pPager->errCode!=SQLITE_OK );
*ppPage = 0;
return pPager->errCode;
}
/* Dispatch all page fetch requests to the appropriate getter method.
*/
int sqlite3PagerGet(
Pager *pPager, /* The pager open on the database file */
Pgno pgno, /* Page number to fetch */
DbPage **ppPage, /* Write a pointer to the page here */
int flags /* PAGER_GET_XXX flags */
){
/* printf("PAGE %u\n", pgno); fflush(stdout); */
return pPager->xGet(pPager, pgno, ppPage, flags);
}
/*
** Acquire a page if it is already in the in-memory cache. Do
** not read the page from disk. Return a pointer to the page,
** or 0 if the page is not in cache.
**
** See also sqlite3PagerGet(). The difference between this routine
** and sqlite3PagerGet() is that _get() will go to the disk and read
** in the page if the page is not already in cache. This routine
** returns NULL if the page is not in cache or if a disk I/O error
** has ever happened.
*/
DbPage *sqlite3PagerLookup(Pager *pPager, Pgno pgno){
sqlite3_pcache_page *pPage;
assert( pPager!=0 );
assert( pgno!=0 );
assert( pPager->pPCache!=0 );
pPage = sqlite3PcacheFetch(pPager->pPCache, pgno, 0);
assert( pPage==0 || pPager->hasHeldSharedLock );
if( pPage==0 ) return 0;
return sqlite3PcacheFetchFinish(pPager->pPCache, pgno, pPage);
}
/*
** Release a page reference.
**
** The sqlite3PagerUnref() and sqlite3PagerUnrefNotNull() may only be
** used if we know that the page being released is not the last page.
** The btree layer always holds page1 open until the end, so these first
** to routines can be used to release any page other than BtShared.pPage1.
**
** Use sqlite3PagerUnrefPageOne() to release page1. This latter routine
** checks the total number of outstanding pages and if the number of
** pages reaches zero it drops the database lock.
*/
void sqlite3PagerUnrefNotNull(DbPage *pPg){
TESTONLY( Pager *pPager = pPg->pPager; )
assert( pPg!=0 );
if( pPg->flags & PGHDR_MMAP ){
assert( pPg->pgno!=1 ); /* Page1 is never memory mapped */
pagerReleaseMapPage(pPg);
}else{
sqlite3PcacheRelease(pPg);
}
/* Do not use this routine to release the last reference to page1 */
assert( sqlite3PcacheRefCount(pPager->pPCache)>0 );
}
void sqlite3PagerUnref(DbPage *pPg){
if( pPg ) sqlite3PagerUnrefNotNull(pPg);
}
void sqlite3PagerUnrefPageOne(DbPage *pPg){
Pager *pPager;
assert( pPg!=0 );
assert( pPg->pgno==1 );
assert( (pPg->flags & PGHDR_MMAP)==0 ); /* Page1 is never memory mapped */
pPager = pPg->pPager;
sqlite3PcacheRelease(pPg);
pagerUnlockIfUnused(pPager);
}
/*
** This function is called at the start of every write transaction.
** There must already be a RESERVED or EXCLUSIVE lock on the database
** file when this routine is called.
**
** Open the journal file for pager pPager and write a journal header
** to the start of it. If there are active savepoints, open the sub-journal
** as well. This function is only used when the journal file is being
** opened to write a rollback log for a transaction. It is not used
** when opening a hot journal file to roll it back.
**
** If the journal file is already open (as it may be in exclusive mode),
** then this function just writes a journal header to the start of the
** already open file.
**
** Whether or not the journal file is opened by this function, the
** Pager.pInJournal bitvec structure is allocated.
**
** Return SQLITE_OK if everything is successful. Otherwise, return
** SQLITE_NOMEM if the attempt to allocate Pager.pInJournal fails, or
** an IO error code if opening or writing the journal file fails.
*/
static int pager_open_journal(Pager *pPager){
int rc = SQLITE_OK; /* Return code */
sqlite3_vfs * const pVfs = pPager->pVfs; /* Local cache of vfs pointer */
assert( pPager->eState==PAGER_WRITER_LOCKED );
assert( assert_pager_state(pPager) );
assert( pPager->pInJournal==0 );
/* If already in the error state, this function is a no-op. But on
** the other hand, this routine is never called if we are already in
** an error state. */
if( NEVER(pPager->errCode) ) return pPager->errCode;
if( !pagerUseWal(pPager) && pPager->journalMode!=PAGER_JOURNALMODE_OFF ){
pPager->pInJournal = sqlite3BitvecCreate(pPager->dbSize);
if( pPager->pInJournal==0 ){
return SQLITE_NOMEM_BKPT;
}
/* Open the journal file if it is not already open. */
if( !isOpen(pPager->jfd) ){
if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY ){
sqlite3MemJournalOpen(pPager->jfd);
}else{
int flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE;
int nSpill;
if( pPager->tempFile ){
flags |= (SQLITE_OPEN_DELETEONCLOSE|SQLITE_OPEN_TEMP_JOURNAL);
flags |= SQLITE_OPEN_EXCLUSIVE;
nSpill = sqlite3Config.nStmtSpill;
}else{
flags |= SQLITE_OPEN_MAIN_JOURNAL;
nSpill = jrnlBufferSize(pPager);
}
/* Verify that the database still has the same name as it did when
** it was originally opened. */
rc = databaseIsUnmoved(pPager);
if( rc==SQLITE_OK ){
rc = sqlite3JournalOpen (
pVfs, pPager->zJournal, pPager->jfd, flags, nSpill
);
}
}
assert( rc!=SQLITE_OK || isOpen(pPager->jfd) );
}
/* Write the first journal header to the journal file and open
** the sub-journal if necessary.
*/
if( rc==SQLITE_OK ){
/* TODO: Check if all of these are really required. */
pPager->nRec = 0;
pPager->journalOff = 0;
pPager->setSuper = 0;
pPager->journalHdr = 0;
rc = writeJournalHdr(pPager);
}
}
if( rc!=SQLITE_OK ){
sqlite3BitvecDestroy(pPager->pInJournal);
pPager->pInJournal = 0;
pPager->journalOff = 0;
}else{
assert( pPager->eState==PAGER_WRITER_LOCKED );
pPager->eState = PAGER_WRITER_CACHEMOD;
}
return rc;
}
/*
** Begin a write-transaction on the specified pager object. If a
** write-transaction has already been opened, this function is a no-op.
**
** If the exFlag argument is false, then acquire at least a RESERVED
** lock on the database file. If exFlag is true, then acquire at least
** an EXCLUSIVE lock. If such a lock is already held, no locking
** functions need be called.
**
** If the subjInMemory argument is non-zero, then any sub-journal opened
** within this transaction will be opened as an in-memory file. This
** has no effect if the sub-journal is already opened (as it may be when
** running in exclusive mode) or if the transaction does not require a
** sub-journal. If the subjInMemory argument is zero, then any required
** sub-journal is implemented in-memory if pPager is an in-memory database,
** or using a temporary file otherwise.
*/
int sqlite3PagerBegin(Pager *pPager, int exFlag, int subjInMemory){
int rc = SQLITE_OK;
if( pPager->errCode ) return pPager->errCode;
assert( pPager->eState>=PAGER_READER && pPager->eState<PAGER_ERROR );
pPager->subjInMemory = (u8)subjInMemory;
if( pPager->eState==PAGER_READER ){
assert( pPager->pInJournal==0 );
if( pagerUseWal(pPager) ){
/* If the pager is configured to use locking_mode=exclusive, and an
** exclusive lock on the database is not already held, obtain it now.
*/
if( pPager->exclusiveMode && sqlite3WalExclusiveMode(pPager->pWal, -1) ){
rc = pagerLockDb(pPager, EXCLUSIVE_LOCK);
if( rc!=SQLITE_OK ){
return rc;
}
(void)sqlite3WalExclusiveMode(pPager->pWal, 1);
}
/* Grab the write lock on the log file. If successful, upgrade to
** PAGER_RESERVED state. Otherwise, return an error code to the caller.
** The busy-handler is not invoked if another connection already
** holds the write-lock. If possible, the upper layer will call it.
*/
rc = sqlite3WalBeginWriteTransaction(pPager->pWal);
}else{
/* Obtain a RESERVED lock on the database file. If the exFlag parameter
** is true, then immediately upgrade this to an EXCLUSIVE lock. The
** busy-handler callback can be used when upgrading to the EXCLUSIVE
** lock, but not when obtaining the RESERVED lock.
*/
rc = pagerLockDb(pPager, RESERVED_LOCK);
if( rc==SQLITE_OK && exFlag ){
rc = pager_wait_on_lock(pPager, EXCLUSIVE_LOCK);
}
}
if( rc==SQLITE_OK ){
/* Change to WRITER_LOCKED state.
**
** WAL mode sets Pager.eState to PAGER_WRITER_LOCKED or CACHEMOD
** when it has an open transaction, but never to DBMOD or FINISHED.
** This is because in those states the code to roll back savepoint
** transactions may copy data from the sub-journal into the database
** file as well as into the page cache. Which would be incorrect in
** WAL mode.
*/
pPager->eState = PAGER_WRITER_LOCKED;
pPager->dbHintSize = pPager->dbSize;
pPager->dbFileSize = pPager->dbSize;
pPager->dbOrigSize = pPager->dbSize;
pPager->journalOff = 0;
}
assert( rc==SQLITE_OK || pPager->eState==PAGER_READER );
assert( rc!=SQLITE_OK || pPager->eState==PAGER_WRITER_LOCKED );
assert( assert_pager_state(pPager) );
}
PAGERTRACE(("TRANSACTION %d\n", PAGERID(pPager)));
return rc;
}
/*
** Write page pPg onto the end of the rollback journal.
*/
static SQLITE_NOINLINE int pagerAddPageToRollbackJournal(PgHdr *pPg){
Pager *pPager = pPg->pPager;
int rc;
u32 cksum;
char *pData2;
i64 iOff = pPager->journalOff;
/* We should never write to the journal file the page that
** contains the database locks. The following assert verifies
** that we do not. */
assert( pPg->pgno!=PAGER_SJ_PGNO(pPager) );
assert( pPager->journalHdr<=pPager->journalOff );
pData2 = pPg->pData;
cksum = pager_cksum(pPager, (u8*)pData2);
/* Even if an IO or diskfull error occurs while journalling the
** page in the block above, set the need-sync flag for the page.
** Otherwise, when the transaction is rolled back, the logic in
** playback_one_page() will think that the page needs to be restored
** in the database file. And if an IO error occurs while doing so,
** then corruption may follow.
*/
pPg->flags |= PGHDR_NEED_SYNC;
rc = write32bits(pPager->jfd, iOff, pPg->pgno);
if( rc!=SQLITE_OK ) return rc;
rc = sqlite3OsWrite(pPager->jfd, pData2, pPager->pageSize, iOff+4);
if( rc!=SQLITE_OK ) return rc;
rc = write32bits(pPager->jfd, iOff+pPager->pageSize+4, cksum);
if( rc!=SQLITE_OK ) return rc;
IOTRACE(("JOUT %p %d %lld %d\n", pPager, pPg->pgno,
pPager->journalOff, pPager->pageSize));
PAGER_INCR(sqlite3_pager_writej_count);
PAGERTRACE(("JOURNAL %d page %d needSync=%d hash(%08x)\n",
PAGERID(pPager), pPg->pgno,
((pPg->flags&PGHDR_NEED_SYNC)?1:0), pager_pagehash(pPg)));
pPager->journalOff += 8 + pPager->pageSize;
pPager->nRec++;
assert( pPager->pInJournal!=0 );
rc = sqlite3BitvecSet(pPager->pInJournal, pPg->pgno);
testcase( rc==SQLITE_NOMEM );
assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
rc |= addToSavepointBitvecs(pPager, pPg->pgno);
assert( rc==SQLITE_OK || rc==SQLITE_NOMEM );
return rc;
}
/*
** Mark a single data page as writeable. The page is written into the
** main journal or sub-journal as required. If the page is written into
** one of the journals, the corresponding bit is set in the
** Pager.pInJournal bitvec and the PagerSavepoint.pInSavepoint bitvecs
** of any open savepoints as appropriate.
*/
static int pager_write(PgHdr *pPg){
Pager *pPager = pPg->pPager;
int rc = SQLITE_OK;
/* This routine is not called unless a write-transaction has already
** been started. The journal file may or may not be open at this point.
** It is never called in the ERROR state.
*/
assert( pPager->eState==PAGER_WRITER_LOCKED
|| pPager->eState==PAGER_WRITER_CACHEMOD
|| pPager->eState==PAGER_WRITER_DBMOD
);
assert( assert_pager_state(pPager) );
assert( pPager->errCode==0 );
assert( pPager->readOnly==0 );
CHECK_PAGE(pPg);
/* The journal file needs to be opened. Higher level routines have already
** obtained the necessary locks to begin the write-transaction, but the
** rollback journal might not yet be open. Open it now if this is the case.
**
** This is done before calling sqlite3PcacheMakeDirty() on the page.
** Otherwise, if it were done after calling sqlite3PcacheMakeDirty(), then
** an error might occur and the pager would end up in WRITER_LOCKED state
** with pages marked as dirty in the cache.
*/
if( pPager->eState==PAGER_WRITER_LOCKED ){
rc = pager_open_journal(pPager);
if( rc!=SQLITE_OK ) return rc;
}
assert( pPager->eState>=PAGER_WRITER_CACHEMOD );
assert( assert_pager_state(pPager) );
/* Mark the page that is about to be modified as dirty. */
sqlite3PcacheMakeDirty(pPg);
/* If a rollback journal is in use, them make sure the page that is about
** to change is in the rollback journal, or if the page is a new page off
** then end of the file, make sure it is marked as PGHDR_NEED_SYNC.
*/
assert( (pPager->pInJournal!=0) == isOpen(pPager->jfd) );
if( pPager->pInJournal!=0
&& sqlite3BitvecTestNotNull(pPager->pInJournal, pPg->pgno)==0
){
assert( pagerUseWal(pPager)==0 );
if( pPg->pgno<=pPager->dbOrigSize ){
rc = pagerAddPageToRollbackJournal(pPg);
if( rc!=SQLITE_OK ){
return rc;
}
}else{
if( pPager->eState!=PAGER_WRITER_DBMOD ){
pPg->flags |= PGHDR_NEED_SYNC;
}
PAGERTRACE(("APPEND %d page %d needSync=%d\n",
PAGERID(pPager), pPg->pgno,
((pPg->flags&PGHDR_NEED_SYNC)?1:0)));
}
}
/* The PGHDR_DIRTY bit is set above when the page was added to the dirty-list
** and before writing the page into the rollback journal. Wait until now,
** after the page has been successfully journalled, before setting the
** PGHDR_WRITEABLE bit that indicates that the page can be safely modified.
*/
pPg->flags |= PGHDR_WRITEABLE;
/* If the statement journal is open and the page is not in it,
** then write the page into the statement journal.
*/
if( pPager->nSavepoint>0 ){
rc = subjournalPageIfRequired(pPg);
}
/* Update the database size and return. */
if( pPager->dbSize<pPg->pgno ){
pPager->dbSize = pPg->pgno;
}
return rc;
}
/*
** This is a variant of sqlite3PagerWrite() that runs when the sector size
** is larger than the page size. SQLite makes the (reasonable) assumption that
** all bytes of a sector are written together by hardware. Hence, all bytes of
** a sector need to be journalled in case of a power loss in the middle of
** a write.
**
** Usually, the sector size is less than or equal to the page size, in which
** case pages can be individually written. This routine only runs in the
** exceptional case where the page size is smaller than the sector size.
*/
static SQLITE_NOINLINE int pagerWriteLargeSector(PgHdr *pPg){
int rc = SQLITE_OK; /* Return code */
Pgno nPageCount; /* Total number of pages in database file */
Pgno pg1; /* First page of the sector pPg is located on. */
int nPage = 0; /* Number of pages starting at pg1 to journal */
int ii; /* Loop counter */
int needSync = 0; /* True if any page has PGHDR_NEED_SYNC */
Pager *pPager = pPg->pPager; /* The pager that owns pPg */
Pgno nPagePerSector = (pPager->sectorSize/pPager->pageSize);
/* Set the doNotSpill NOSYNC bit to 1. This is because we cannot allow
** a journal header to be written between the pages journaled by
** this function.
*/
assert( !MEMDB );
assert( (pPager->doNotSpill & SPILLFLAG_NOSYNC)==0 );
pPager->doNotSpill |= SPILLFLAG_NOSYNC;
/* This trick assumes that both the page-size and sector-size are
** an integer power of 2. It sets variable pg1 to the identifier
** of the first page of the sector pPg is located on.
*/
pg1 = ((pPg->pgno-1) & ~(nPagePerSector-1)) + 1;
nPageCount = pPager->dbSize;
if( pPg->pgno>nPageCount ){
nPage = (pPg->pgno - pg1)+1;
}else if( (pg1+nPagePerSector-1)>nPageCount ){
nPage = nPageCount+1-pg1;
}else{
nPage = nPagePerSector;
}
assert(nPage>0);
assert(pg1<=pPg->pgno);
assert((pg1+nPage)>pPg->pgno);
for(ii=0; ii<nPage && rc==SQLITE_OK; ii++){
Pgno pg = pg1+ii;
PgHdr *pPage;
if( pg==pPg->pgno || !sqlite3BitvecTest(pPager->pInJournal, pg) ){
if( pg!=PAGER_SJ_PGNO(pPager) ){
rc = sqlite3PagerGet(pPager, pg, &pPage, 0);
if( rc==SQLITE_OK ){
rc = pager_write(pPage);
if( pPage->flags&PGHDR_NEED_SYNC ){
needSync = 1;
}
sqlite3PagerUnrefNotNull(pPage);
}
}
}else if( (pPage = sqlite3PagerLookup(pPager, pg))!=0 ){
if( pPage->flags&PGHDR_NEED_SYNC ){
needSync = 1;
}
sqlite3PagerUnrefNotNull(pPage);
}
}
/* If the PGHDR_NEED_SYNC flag is set for any of the nPage pages
** starting at pg1, then it needs to be set for all of them. Because
** writing to any of these nPage pages may damage the others, the
** journal file must contain sync()ed copies of all of them
** before any of them can be written out to the database file.
*/
if( rc==SQLITE_OK && needSync ){
assert( !MEMDB );
for(ii=0; ii<nPage; ii++){
PgHdr *pPage = sqlite3PagerLookup(pPager, pg1+ii);
if( pPage ){
pPage->flags |= PGHDR_NEED_SYNC;
sqlite3PagerUnrefNotNull(pPage);
}
}
}
assert( (pPager->doNotSpill & SPILLFLAG_NOSYNC)!=0 );
pPager->doNotSpill &= ~SPILLFLAG_NOSYNC;
return rc;
}
/*
** Mark a data page as writeable. This routine must be called before
** making changes to a page. The caller must check the return value
** of this function and be careful not to change any page data unless
** this routine returns SQLITE_OK.
**
** The difference between this function and pager_write() is that this
** function also deals with the special case where 2 or more pages
** fit on a single disk sector. In this case all co-resident pages
** must have been written to the journal file before returning.
**
** If an error occurs, SQLITE_NOMEM or an IO error code is returned
** as appropriate. Otherwise, SQLITE_OK.
*/
int sqlite3PagerWrite(PgHdr *pPg){
Pager *pPager = pPg->pPager;
assert( (pPg->flags & PGHDR_MMAP)==0 );
assert( pPager->eState>=PAGER_WRITER_LOCKED );
assert( assert_pager_state(pPager) );
if( (pPg->flags & PGHDR_WRITEABLE)!=0 && pPager->dbSize>=pPg->pgno ){
if( pPager->nSavepoint ) return subjournalPageIfRequired(pPg);
return SQLITE_OK;
}else if( pPager->errCode ){
return pPager->errCode;
}else if( pPager->sectorSize > (u32)pPager->pageSize ){
assert( pPager->tempFile==0 );
return pagerWriteLargeSector(pPg);
}else{
return pager_write(pPg);
}
}
/*
** Return TRUE if the page given in the argument was previously passed
** to sqlite3PagerWrite(). In other words, return TRUE if it is ok
** to change the content of the page.
*/
#ifndef NDEBUG
int sqlite3PagerIswriteable(DbPage *pPg){
return pPg->flags & PGHDR_WRITEABLE;
}
#endif
/*
** A call to this routine tells the pager that it is not necessary to
** write the information on page pPg back to the disk, even though
** that page might be marked as dirty. This happens, for example, when
** the page has been added as a leaf of the freelist and so its
** content no longer matters.
**
** The overlying software layer calls this routine when all of the data
** on the given page is unused. The pager marks the page as clean so
** that it does not get written to disk.
**
** Tests show that this optimization can quadruple the speed of large
** DELETE operations.
**
** This optimization cannot be used with a temp-file, as the page may
** have been dirty at the start of the transaction. In that case, if
** memory pressure forces page pPg out of the cache, the data does need
** to be written out to disk so that it may be read back in if the
** current transaction is rolled back.
*/
void sqlite3PagerDontWrite(PgHdr *pPg){
Pager *pPager = pPg->pPager;
if( !pPager->tempFile && (pPg->flags&PGHDR_DIRTY) && pPager->nSavepoint==0 ){
PAGERTRACE(("DONT_WRITE page %d of %d\n", pPg->pgno, PAGERID(pPager)));
IOTRACE(("CLEAN %p %d\n", pPager, pPg->pgno))
pPg->flags |= PGHDR_DONT_WRITE;
pPg->flags &= ~PGHDR_WRITEABLE;
testcase( pPg->flags & PGHDR_NEED_SYNC );
pager_set_pagehash(pPg);
}
}
/*
** This routine is called to increment the value of the database file
** change-counter, stored as a 4-byte big-endian integer starting at
** byte offset 24 of the pager file. The secondary change counter at
** 92 is also updated, as is the SQLite version number at offset 96.
**
** But this only happens if the pPager->changeCountDone flag is false.
** To avoid excess churning of page 1, the update only happens once.
** See also the pager_write_changecounter() routine that does an
** unconditional update of the change counters.
**
** If the isDirectMode flag is zero, then this is done by calling
** sqlite3PagerWrite() on page 1, then modifying the contents of the
** page data. In this case the file will be updated when the current
** transaction is committed.
**
** The isDirectMode flag may only be non-zero if the library was compiled
** with the SQLITE_ENABLE_ATOMIC_WRITE macro defined. In this case,
** if isDirect is non-zero, then the database file is updated directly
** by writing an updated version of page 1 using a call to the
** sqlite3OsWrite() function.
*/
static int pager_incr_changecounter(Pager *pPager, int isDirectMode){
int rc = SQLITE_OK;
assert( pPager->eState==PAGER_WRITER_CACHEMOD
|| pPager->eState==PAGER_WRITER_DBMOD
);
assert( assert_pager_state(pPager) );
/* Declare and initialize constant integer 'isDirect'. If the
** atomic-write optimization is enabled in this build, then isDirect
** is initialized to the value passed as the isDirectMode parameter
** to this function. Otherwise, it is always set to zero.
**
** The idea is that if the atomic-write optimization is not
** enabled at compile time, the compiler can omit the tests of
** 'isDirect' below, as well as the block enclosed in the
** "if( isDirect )" condition.
*/
#ifndef SQLITE_ENABLE_ATOMIC_WRITE
# define DIRECT_MODE 0
assert( isDirectMode==0 );
UNUSED_PARAMETER(isDirectMode);
#else
# define DIRECT_MODE isDirectMode
#endif
if( !pPager->changeCountDone && ALWAYS(pPager->dbSize>0) ){
PgHdr *pPgHdr; /* Reference to page 1 */
assert( !pPager->tempFile && isOpen(pPager->fd) );
/* Open page 1 of the file for writing. */
rc = sqlite3PagerGet(pPager, 1, &pPgHdr, 0);
assert( pPgHdr==0 || rc==SQLITE_OK );
/* If page one was fetched successfully, and this function is not
** operating in direct-mode, make page 1 writable. When not in
** direct mode, page 1 is always held in cache and hence the PagerGet()
** above is always successful - hence the ALWAYS on rc==SQLITE_OK.
*/
if( !DIRECT_MODE && ALWAYS(rc==SQLITE_OK) ){
rc = sqlite3PagerWrite(pPgHdr);
}
if( rc==SQLITE_OK ){
/* Actually do the update of the change counter */
pager_write_changecounter(pPgHdr);
/* If running in direct mode, write the contents of page 1 to the file. */
if( DIRECT_MODE ){
const void *zBuf;
assert( pPager->dbFileSize>0 );
zBuf = pPgHdr->pData;
if( rc==SQLITE_OK ){
rc = sqlite3OsWrite(pPager->fd, zBuf, pPager->pageSize, 0);
pPager->aStat[PAGER_STAT_WRITE]++;
}
if( rc==SQLITE_OK ){
/* Update the pager's copy of the change-counter. Otherwise, the
** next time a read transaction is opened the cache will be
** flushed (as the change-counter values will not match). */
const void *pCopy = (const void *)&((const char *)zBuf)[24];
memcpy(&pPager->dbFileVers, pCopy, sizeof(pPager->dbFileVers));
pPager->changeCountDone = 1;
}
}else{
pPager->changeCountDone = 1;
}
}
/* Release the page reference. */
sqlite3PagerUnref(pPgHdr);
}
return rc;
}
/*
** Sync the database file to disk. This is a no-op for in-memory databases
** or pages with the Pager.noSync flag set.
**
** If successful, or if called on a pager for which it is a no-op, this
** function returns SQLITE_OK. Otherwise, an IO error code is returned.
*/
int sqlite3PagerSync(Pager *pPager, const char *zSuper){
int rc = SQLITE_OK;
void *pArg = (void*)zSuper;
rc = sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_SYNC, pArg);
if( rc==SQLITE_NOTFOUND ) rc = SQLITE_OK;
if( rc==SQLITE_OK && !pPager->noSync ){
assert( !MEMDB );
rc = sqlite3OsSync(pPager->fd, pPager->syncFlags);
}
return rc;
}
/*
** This function may only be called while a write-transaction is active in
** rollback. If the connection is in WAL mode, this call is a no-op.
** Otherwise, if the connection does not already have an EXCLUSIVE lock on
** the database file, an attempt is made to obtain one.
**
** If the EXCLUSIVE lock is already held or the attempt to obtain it is
** successful, or the connection is in WAL mode, SQLITE_OK is returned.
** Otherwise, either SQLITE_BUSY or an SQLITE_IOERR_XXX error code is
** returned.
*/
int sqlite3PagerExclusiveLock(Pager *pPager){
int rc = pPager->errCode;
assert( assert_pager_state(pPager) );
if( rc==SQLITE_OK ){
assert( pPager->eState==PAGER_WRITER_CACHEMOD
|| pPager->eState==PAGER_WRITER_DBMOD
|| pPager->eState==PAGER_WRITER_LOCKED
);
assert( assert_pager_state(pPager) );
if( 0==pagerUseWal(pPager) ){
rc = pager_wait_on_lock(pPager, EXCLUSIVE_LOCK);
}
}
return rc;
}
/*
** Sync the database file for the pager pPager. zSuper points to the name
** of a super-journal file that should be written into the individual
** journal file. zSuper may be NULL, which is interpreted as no
** super-journal (a single database transaction).
**
** This routine ensures that:
**
** * The database file change-counter is updated,
** * the journal is synced (unless the atomic-write optimization is used),
** * all dirty pages are written to the database file,
** * the database file is truncated (if required), and
** * the database file synced.
**
** The only thing that remains to commit the transaction is to finalize
** (delete, truncate or zero the first part of) the journal file (or
** delete the super-journal file if specified).
**
** Note that if zSuper==NULL, this does not overwrite a previous value
** passed to an sqlite3PagerCommitPhaseOne() call.
**
** If the final parameter - noSync - is true, then the database file itself
** is not synced. The caller must call sqlite3PagerSync() directly to
** sync the database file before calling CommitPhaseTwo() to delete the
** journal file in this case.
*/
int sqlite3PagerCommitPhaseOne(
Pager *pPager, /* Pager object */
const char *zSuper, /* If not NULL, the super-journal name */
int noSync /* True to omit the xSync on the db file */
){
int rc = SQLITE_OK; /* Return code */
assert( pPager->eState==PAGER_WRITER_LOCKED
|| pPager->eState==PAGER_WRITER_CACHEMOD
|| pPager->eState==PAGER_WRITER_DBMOD
|| pPager->eState==PAGER_ERROR
);
assert( assert_pager_state(pPager) );
/* If a prior error occurred, report that error again. */
if( NEVER(pPager->errCode) ) return pPager->errCode;
/* Provide the ability to easily simulate an I/O error during testing */
if( sqlite3FaultSim(400) ) return SQLITE_IOERR;
PAGERTRACE(("DATABASE SYNC: File=%s zSuper=%s nSize=%d\n",
pPager->zFilename, zSuper, pPager->dbSize));
/* If no database changes have been made, return early. */
if( pPager->eState<PAGER_WRITER_CACHEMOD ) return SQLITE_OK;
assert( MEMDB==0 || pPager->tempFile );
assert( isOpen(pPager->fd) || pPager->tempFile );
if( 0==pagerFlushOnCommit(pPager, 1) ){
/* If this is an in-memory db, or no pages have been written to, or this
** function has already been called, it is mostly a no-op. However, any
** backup in progress needs to be restarted. */
sqlite3BackupRestart(pPager->pBackup);
}else{
PgHdr *pList;
if( pagerUseWal(pPager) ){
PgHdr *pPageOne = 0;
pList = sqlite3PcacheDirtyList(pPager->pPCache);
if( pList==0 ){
/* Must have at least one page for the WAL commit flag.
** Ticket [2d1a5c67dfc2363e44f29d9bbd57f] 2011-05-18 */
rc = sqlite3PagerGet(pPager, 1, &pPageOne, 0);
pList = pPageOne;
pList->pDirty = 0;
}
assert( rc==SQLITE_OK );
if( ALWAYS(pList) ){
rc = pagerWalFrames(pPager, pList, pPager->dbSize, 1);
}
sqlite3PagerUnref(pPageOne);
if( rc==SQLITE_OK ){
sqlite3PcacheCleanAll(pPager->pPCache);
}
}else{
/* The bBatch boolean is true if the batch-atomic-write commit method
** should be used. No rollback journal is created if batch-atomic-write
** is enabled.
*/
#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
sqlite3_file *fd = pPager->fd;
int bBatch = zSuper==0 /* An SQLITE_IOCAP_BATCH_ATOMIC commit */
&& (sqlite3OsDeviceCharacteristics(fd) & SQLITE_IOCAP_BATCH_ATOMIC)
&& !pPager->noSync
&& sqlite3JournalIsInMemory(pPager->jfd);
#else
# define bBatch 0
#endif
#ifdef SQLITE_ENABLE_ATOMIC_WRITE
/* The following block updates the change-counter. Exactly how it
** does this depends on whether or not the atomic-update optimization
** was enabled at compile time, and if this transaction meets the
** runtime criteria to use the operation:
**
** * The file-system supports the atomic-write property for
** blocks of size page-size, and
** * This commit is not part of a multi-file transaction, and
** * Exactly one page has been modified and store in the journal file.
**
** If the optimization was not enabled at compile time, then the
** pager_incr_changecounter() function is called to update the change
** counter in 'indirect-mode'. If the optimization is compiled in but
** is not applicable to this transaction, call sqlite3JournalCreate()
** to make sure the journal file has actually been created, then call
** pager_incr_changecounter() to update the change-counter in indirect
** mode.
**
** Otherwise, if the optimization is both enabled and applicable,
** then call pager_incr_changecounter() to update the change-counter
** in 'direct' mode. In this case the journal file will never be
** created for this transaction.
*/
if( bBatch==0 ){
PgHdr *pPg;
assert( isOpen(pPager->jfd)
|| pPager->journalMode==PAGER_JOURNALMODE_OFF
|| pPager->journalMode==PAGER_JOURNALMODE_WAL
);
if( !zSuper && isOpen(pPager->jfd)
&& pPager->journalOff==jrnlBufferSize(pPager)
&& pPager->dbSize>=pPager->dbOrigSize
&& (!(pPg = sqlite3PcacheDirtyList(pPager->pPCache)) || 0==pPg->pDirty)
){
/* Update the db file change counter via the direct-write method. The
** following call will modify the in-memory representation of page 1
** to include the updated change counter and then write page 1
** directly to the database file. Because of the atomic-write
** property of the host file-system, this is safe.
*/
rc = pager_incr_changecounter(pPager, 1);
}else{
rc = sqlite3JournalCreate(pPager->jfd);
if( rc==SQLITE_OK ){
rc = pager_incr_changecounter(pPager, 0);
}
}
}
#else /* SQLITE_ENABLE_ATOMIC_WRITE */
#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
if( zSuper ){
rc = sqlite3JournalCreate(pPager->jfd);
if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
assert( bBatch==0 );
}
#endif
rc = pager_incr_changecounter(pPager, 0);
#endif /* !SQLITE_ENABLE_ATOMIC_WRITE */
if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
/* Write the super-journal name into the journal file. If a
** super-journal file name has already been written to the journal file,
** or if zSuper is NULL (no super-journal), then this call is a no-op.
*/
rc = writeSuperJournal(pPager, zSuper);
if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
/* Sync the journal file and write all dirty pages to the database.
** If the atomic-update optimization is being used, this sync will not
** create the journal file or perform any real IO.
**
** Because the change-counter page was just modified, unless the
** atomic-update optimization is used it is almost certain that the
** journal requires a sync here. However, in locking_mode=exclusive
** on a system under memory pressure it is just possible that this is
** not the case. In this case it is likely enough that the redundant
** xSync() call will be changed to a no-op by the OS anyhow.
*/
rc = syncJournal(pPager, 0);
if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
pList = sqlite3PcacheDirtyList(pPager->pPCache);
#ifdef SQLITE_ENABLE_BATCH_ATOMIC_WRITE
if( bBatch ){
rc = sqlite3OsFileControl(fd, SQLITE_FCNTL_BEGIN_ATOMIC_WRITE, 0);
if( rc==SQLITE_OK ){
rc = pager_write_pagelist(pPager, pList);
if( rc==SQLITE_OK ){
rc = sqlite3OsFileControl(fd, SQLITE_FCNTL_COMMIT_ATOMIC_WRITE, 0);
}
if( rc!=SQLITE_OK ){
sqlite3OsFileControlHint(fd, SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE, 0);
}
}
if( (rc&0xFF)==SQLITE_IOERR && rc!=SQLITE_IOERR_NOMEM ){
rc = sqlite3JournalCreate(pPager->jfd);
if( rc!=SQLITE_OK ){
sqlite3OsClose(pPager->jfd);
goto commit_phase_one_exit;
}
bBatch = 0;
}else{
sqlite3OsClose(pPager->jfd);
}
}
#endif /* SQLITE_ENABLE_BATCH_ATOMIC_WRITE */
if( bBatch==0 ){
rc = pager_write_pagelist(pPager, pList);
}
if( rc!=SQLITE_OK ){
assert( rc!=SQLITE_IOERR_BLOCKED );
goto commit_phase_one_exit;
}
sqlite3PcacheCleanAll(pPager->pPCache);
/* If the file on disk is smaller than the database image, use
** pager_truncate to grow the file here. This can happen if the database
** image was extended as part of the current transaction and then the
** last page in the db image moved to the free-list. In this case the
** last page is never written out to disk, leaving the database file
** undersized. Fix this now if it is the case. */
if( pPager->dbSize>pPager->dbFileSize ){
Pgno nNew = pPager->dbSize - (pPager->dbSize==PAGER_SJ_PGNO(pPager));
assert( pPager->eState==PAGER_WRITER_DBMOD );
rc = pager_truncate(pPager, nNew);
if( rc!=SQLITE_OK ) goto commit_phase_one_exit;
}
/* Finally, sync the database file. */
if( !noSync ){
rc = sqlite3PagerSync(pPager, zSuper);
}
IOTRACE(("DBSYNC %p\n", pPager))
}
}
commit_phase_one_exit:
if( rc==SQLITE_OK && !pagerUseWal(pPager) ){
pPager->eState = PAGER_WRITER_FINISHED;
}
return rc;
}
/*
** When this function is called, the database file has been completely
** updated to reflect the changes made by the current transaction and
** synced to disk. The journal file still exists in the file-system
** though, and if a failure occurs at this point it will eventually
** be used as a hot-journal and the current transaction rolled back.
**
** This function finalizes the journal file, either by deleting,
** truncating or partially zeroing it, so that it cannot be used
** for hot-journal rollback. Once this is done the transaction is
** irrevocably committed.
**
** If an error occurs, an IO error code is returned and the pager
** moves into the error state. Otherwise, SQLITE_OK is returned.
*/
int sqlite3PagerCommitPhaseTwo(Pager *pPager){
int rc = SQLITE_OK; /* Return code */
/* This routine should not be called if a prior error has occurred.
** But if (due to a coding error elsewhere in the system) it does get
** called, just return the same error code without doing anything. */
if( NEVER(pPager->errCode) ) return pPager->errCode;
pPager->iDataVersion++;
assert( pPager->eState==PAGER_WRITER_LOCKED
|| pPager->eState==PAGER_WRITER_FINISHED
|| (pagerUseWal(pPager) && pPager->eState==PAGER_WRITER_CACHEMOD)
);
assert( assert_pager_state(pPager) );
/* An optimization. If the database was not actually modified during
** this transaction, the pager is running in exclusive-mode and is
** using persistent journals, then this function is a no-op.
**
** The start of the journal file currently contains a single journal
** header with the nRec field set to 0. If such a journal is used as
** a hot-journal during hot-journal rollback, 0 changes will be made
** to the database file. So there is no need to zero the journal
** header. Since the pager is in exclusive mode, there is no need
** to drop any locks either.
*/
if( pPager->eState==PAGER_WRITER_LOCKED
&& pPager->exclusiveMode
&& pPager->journalMode==PAGER_JOURNALMODE_PERSIST
){
assert( pPager->journalOff==JOURNAL_HDR_SZ(pPager) || !pPager->journalOff );
pPager->eState = PAGER_READER;
return SQLITE_OK;
}
PAGERTRACE(("COMMIT %d\n", PAGERID(pPager)));
rc = pager_end_transaction(pPager, pPager->setSuper, 1);
return pager_error(pPager, rc);
}
/*
** If a write transaction is open, then all changes made within the
** transaction are reverted and the current write-transaction is closed.
** The pager falls back to PAGER_READER state if successful, or PAGER_ERROR
** state if an error occurs.
**
** If the pager is already in PAGER_ERROR state when this function is called,
** it returns Pager.errCode immediately. No work is performed in this case.
**
** Otherwise, in rollback mode, this function performs two functions:
**
** 1) It rolls back the journal file, restoring all database file and
** in-memory cache pages to the state they were in when the transaction
** was opened, and
**
** 2) It finalizes the journal file, so that it is not used for hot
** rollback at any point in the future.
**
** Finalization of the journal file (task 2) is only performed if the
** rollback is successful.
**
** In WAL mode, all cache-entries containing data modified within the
** current transaction are either expelled from the cache or reverted to
** their pre-transaction state by re-reading data from the database or
** WAL files. The WAL transaction is then closed.
*/
int sqlite3PagerRollback(Pager *pPager){
int rc = SQLITE_OK; /* Return code */
PAGERTRACE(("ROLLBACK %d\n", PAGERID(pPager)));
/* PagerRollback() is a no-op if called in READER or OPEN state. If
** the pager is already in the ERROR state, the rollback is not
** attempted here. Instead, the error code is returned to the caller.
*/
assert( assert_pager_state(pPager) );
if( pPager->eState==PAGER_ERROR ) return pPager->errCode;
if( pPager->eState<=PAGER_READER ) return SQLITE_OK;
if( pagerUseWal(pPager) ){
int rc2;
rc = sqlite3PagerSavepoint(pPager, SAVEPOINT_ROLLBACK, -1);
rc2 = pager_end_transaction(pPager, pPager->setSuper, 0);
if( rc==SQLITE_OK ) rc = rc2;
}else if( !isOpen(pPager->jfd) || pPager->eState==PAGER_WRITER_LOCKED ){
int eState = pPager->eState;
rc = pager_end_transaction(pPager, 0, 0);
if( !MEMDB && eState>PAGER_WRITER_LOCKED ){
/* This can happen using journal_mode=off. Move the pager to the error
** state to indicate that the contents of the cache may not be trusted.
** Any active readers will get SQLITE_ABORT.
*/
pPager->errCode = SQLITE_ABORT;
pPager->eState = PAGER_ERROR;
setGetterMethod(pPager);
return rc;
}
}else{
rc = pager_playback(pPager, 0);
}
assert( pPager->eState==PAGER_READER || rc!=SQLITE_OK );
assert( rc==SQLITE_OK || rc==SQLITE_FULL || rc==SQLITE_CORRUPT
|| rc==SQLITE_NOMEM || (rc&0xFF)==SQLITE_IOERR
|| rc==SQLITE_CANTOPEN
);
/* If an error occurs during a ROLLBACK, we can no longer trust the pager
** cache. So call pager_error() on the way out to make any error persistent.
*/
return pager_error(pPager, rc);
}
/*
** Return TRUE if the database file is opened read-only. Return FALSE
** if the database is (in theory) writable.
*/
u8 sqlite3PagerIsreadonly(Pager *pPager){
return pPager->readOnly;
}
#ifdef SQLITE_DEBUG
/*
** Return the sum of the reference counts for all pages held by pPager.
*/
int sqlite3PagerRefcount(Pager *pPager){
return sqlite3PcacheRefCount(pPager->pPCache);
}
#endif
/*
** Return the approximate number of bytes of memory currently
** used by the pager and its associated cache.
*/
int sqlite3PagerMemUsed(Pager *pPager){
int perPageSize = pPager->pageSize + pPager->nExtra
+ (int)(sizeof(PgHdr) + 5*sizeof(void*));
return perPageSize*sqlite3PcachePagecount(pPager->pPCache)
+ sqlite3MallocSize(pPager)
+ pPager->pageSize;
}
/*
** Return the number of references to the specified page.
*/
int sqlite3PagerPageRefcount(DbPage *pPage){
return sqlite3PcachePageRefcount(pPage);
}
#ifdef SQLITE_TEST
/*
** This routine is used for testing and analysis only.
*/
int *sqlite3PagerStats(Pager *pPager){
static int a[11];
a[0] = sqlite3PcacheRefCount(pPager->pPCache);
a[1] = sqlite3PcachePagecount(pPager->pPCache);
a[2] = sqlite3PcacheGetCachesize(pPager->pPCache);
a[3] = pPager->eState==PAGER_OPEN ? -1 : (int) pPager->dbSize;
a[4] = pPager->eState;
a[5] = pPager->errCode;
a[6] = pPager->aStat[PAGER_STAT_HIT];
a[7] = pPager->aStat[PAGER_STAT_MISS];
a[8] = 0; /* Used to be pPager->nOvfl */
a[9] = pPager->nRead;
a[10] = pPager->aStat[PAGER_STAT_WRITE];
return a;
}
#endif
/*
** Parameter eStat must be one of SQLITE_DBSTATUS_CACHE_HIT, _MISS, _WRITE,
** or _WRITE+1. The SQLITE_DBSTATUS_CACHE_WRITE+1 case is a translation
** of SQLITE_DBSTATUS_CACHE_SPILL. The _SPILL case is not contiguous because
** it was added later.
**
** Before returning, *pnVal is incremented by the
** current cache hit or miss count, according to the value of eStat. If the
** reset parameter is non-zero, the cache hit or miss count is zeroed before
** returning.
*/
void sqlite3PagerCacheStat(Pager *pPager, int eStat, int reset, int *pnVal){
assert( eStat==SQLITE_DBSTATUS_CACHE_HIT
|| eStat==SQLITE_DBSTATUS_CACHE_MISS
|| eStat==SQLITE_DBSTATUS_CACHE_WRITE
|| eStat==SQLITE_DBSTATUS_CACHE_WRITE+1
);
assert( SQLITE_DBSTATUS_CACHE_HIT+1==SQLITE_DBSTATUS_CACHE_MISS );
assert( SQLITE_DBSTATUS_CACHE_HIT+2==SQLITE_DBSTATUS_CACHE_WRITE );
assert( PAGER_STAT_HIT==0 && PAGER_STAT_MISS==1
&& PAGER_STAT_WRITE==2 && PAGER_STAT_SPILL==3 );
eStat -= SQLITE_DBSTATUS_CACHE_HIT;
*pnVal += pPager->aStat[eStat];
if( reset ){
pPager->aStat[eStat] = 0;
}
}
/*
** Return true if this is an in-memory or temp-file backed pager.
*/
int sqlite3PagerIsMemdb(Pager *pPager){
return pPager->tempFile || pPager->memVfs;
}
/*
** Check that there are at least nSavepoint savepoints open. If there are
** currently less than nSavepoints open, then open one or more savepoints
** to make up the difference. If the number of savepoints is already
** equal to nSavepoint, then this function is a no-op.
**
** If a memory allocation fails, SQLITE_NOMEM is returned. If an error
** occurs while opening the sub-journal file, then an IO error code is
** returned. Otherwise, SQLITE_OK.
*/
static SQLITE_NOINLINE int pagerOpenSavepoint(Pager *pPager, int nSavepoint){
int rc = SQLITE_OK; /* Return code */
int nCurrent = pPager->nSavepoint; /* Current number of savepoints */
int ii; /* Iterator variable */
PagerSavepoint *aNew; /* New Pager.aSavepoint array */
assert( pPager->eState>=PAGER_WRITER_LOCKED );
assert( assert_pager_state(pPager) );
assert( nSavepoint>nCurrent && pPager->useJournal );
/* Grow the Pager.aSavepoint array using realloc(). Return SQLITE_NOMEM
** if the allocation fails. Otherwise, zero the new portion in case a
** malloc failure occurs while populating it in the for(...) loop below.
*/
aNew = (PagerSavepoint *)sqlite3Realloc(
pPager->aSavepoint, sizeof(PagerSavepoint)*nSavepoint
);
if( !aNew ){
return SQLITE_NOMEM_BKPT;
}
memset(&aNew[nCurrent], 0, (nSavepoint-nCurrent) * sizeof(PagerSavepoint));
pPager->aSavepoint = aNew;
/* Populate the PagerSavepoint structures just allocated. */
for(ii=nCurrent; ii<nSavepoint; ii++){
aNew[ii].nOrig = pPager->dbSize;
if( isOpen(pPager->jfd) && pPager->journalOff>0 ){
aNew[ii].iOffset = pPager->journalOff;
}else{
aNew[ii].iOffset = JOURNAL_HDR_SZ(pPager);
}
aNew[ii].iSubRec = pPager->nSubRec;
aNew[ii].pInSavepoint = sqlite3BitvecCreate(pPager->dbSize);
aNew[ii].bTruncateOnRelease = 1;
if( !aNew[ii].pInSavepoint ){
return SQLITE_NOMEM_BKPT;
}
if( pagerUseWal(pPager) ){
sqlite3WalSavepoint(pPager->pWal, aNew[ii].aWalData);
}
pPager->nSavepoint = ii+1;
}
assert( pPager->nSavepoint==nSavepoint );
assertTruncateConstraint(pPager);
return rc;
}
int sqlite3PagerOpenSavepoint(Pager *pPager, int nSavepoint){
assert( pPager->eState>=PAGER_WRITER_LOCKED );
assert( assert_pager_state(pPager) );
if( nSavepoint>pPager->nSavepoint && pPager->useJournal ){
return pagerOpenSavepoint(pPager, nSavepoint);
}else{
return SQLITE_OK;
}
}
/*
** This function is called to rollback or release (commit) a savepoint.
** The savepoint to release or rollback need not be the most recently
** created savepoint.
**
** Parameter op is always either SAVEPOINT_ROLLBACK or SAVEPOINT_RELEASE.
** If it is SAVEPOINT_RELEASE, then release and destroy the savepoint with
** index iSavepoint. If it is SAVEPOINT_ROLLBACK, then rollback all changes
** that have occurred since the specified savepoint was created.
**
** The savepoint to rollback or release is identified by parameter
** iSavepoint. A value of 0 means to operate on the outermost savepoint
** (the first created). A value of (Pager.nSavepoint-1) means operate
** on the most recently created savepoint. If iSavepoint is greater than
** (Pager.nSavepoint-1), then this function is a no-op.
**
** If a negative value is passed to this function, then the current
** transaction is rolled back. This is different to calling
** sqlite3PagerRollback() because this function does not terminate
** the transaction or unlock the database, it just restores the
** contents of the database to its original state.
**
** In any case, all savepoints with an index greater than iSavepoint
** are destroyed. If this is a release operation (op==SAVEPOINT_RELEASE),
** then savepoint iSavepoint is also destroyed.
**
** This function may return SQLITE_NOMEM if a memory allocation fails,
** or an IO error code if an IO error occurs while rolling back a
** savepoint. If no errors occur, SQLITE_OK is returned.
*/
int sqlite3PagerSavepoint(Pager *pPager, int op, int iSavepoint){
int rc = pPager->errCode;
#ifdef SQLITE_ENABLE_ZIPVFS
if( op==SAVEPOINT_RELEASE ) rc = SQLITE_OK;
#endif
assert( op==SAVEPOINT_RELEASE || op==SAVEPOINT_ROLLBACK );
assert( iSavepoint>=0 || op==SAVEPOINT_ROLLBACK );
if( rc==SQLITE_OK && iSavepoint<pPager->nSavepoint ){
int ii; /* Iterator variable */
int nNew; /* Number of remaining savepoints after this op. */
/* Figure out how many savepoints will still be active after this
** operation. Store this value in nNew. Then free resources associated
** with any savepoints that are destroyed by this operation.
*/
nNew = iSavepoint + (( op==SAVEPOINT_RELEASE ) ? 0 : 1);
for(ii=nNew; ii<pPager->nSavepoint; ii++){
sqlite3BitvecDestroy(pPager->aSavepoint[ii].pInSavepoint);
}
pPager->nSavepoint = nNew;
/* Truncate the sub-journal so that it only includes the parts
** that are still in use. */
if( op==SAVEPOINT_RELEASE ){
PagerSavepoint *pRel = &pPager->aSavepoint[nNew];
if( pRel->bTruncateOnRelease && isOpen(pPager->sjfd) ){
/* Only truncate if it is an in-memory sub-journal. */
if( sqlite3JournalIsInMemory(pPager->sjfd) ){
i64 sz = (pPager->pageSize+4)*(i64)pRel->iSubRec;
rc = sqlite3OsTruncate(pPager->sjfd, sz);
assert( rc==SQLITE_OK );
}
pPager->nSubRec = pRel->iSubRec;
}
}
/* Else this is a rollback operation, playback the specified savepoint.
** If this is a temp-file, it is possible that the journal file has
** not yet been opened. In this case there have been no changes to
** the database file, so the playback operation can be skipped.
*/
else if( pagerUseWal(pPager) || isOpen(pPager->jfd) ){
PagerSavepoint *pSavepoint = (nNew==0)?0:&pPager->aSavepoint[nNew-1];
rc = pagerPlaybackSavepoint(pPager, pSavepoint);
assert(rc!=SQLITE_DONE);
}
#ifdef SQLITE_ENABLE_ZIPVFS
/* If the cache has been modified but the savepoint cannot be rolled
** back journal_mode=off, put the pager in the error state. This way,
** if the VFS used by this pager includes ZipVFS, the entire transaction
** can be rolled back at the ZipVFS level. */
else if(
pPager->journalMode==PAGER_JOURNALMODE_OFF
&& pPager->eState>=PAGER_WRITER_CACHEMOD
){
pPager->errCode = SQLITE_ABORT;
pPager->eState = PAGER_ERROR;
setGetterMethod(pPager);
}
#endif
}
return rc;
}
/*
** Return the full pathname of the database file.
**
** Except, if the pager is in-memory only, then return an empty string if
** nullIfMemDb is true. This routine is called with nullIfMemDb==1 when
** used to report the filename to the user, for compatibility with legacy
** behavior. But when the Btree needs to know the filename for matching to
** shared cache, it uses nullIfMemDb==0 so that in-memory databases can
** participate in shared-cache.
**
** The return value to this routine is always safe to use with
** sqlite3_uri_parameter() and sqlite3_filename_database() and friends.
*/
const char *sqlite3PagerFilename(const Pager *pPager, int nullIfMemDb){
static const char zFake[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
return (nullIfMemDb && pPager->memDb) ? &zFake[4] : pPager->zFilename;
}
/*
** Return the VFS structure for the pager.
*/
sqlite3_vfs *sqlite3PagerVfs(Pager *pPager){
return pPager->pVfs;
}
/*
** Return the file handle for the database file associated
** with the pager. This might return NULL if the file has
** not yet been opened.
*/
sqlite3_file *sqlite3PagerFile(Pager *pPager){
return pPager->fd;
}
/*
** Return the file handle for the journal file (if it exists).
** This will be either the rollback journal or the WAL file.
*/
sqlite3_file *sqlite3PagerJrnlFile(Pager *pPager){
#if SQLITE_OMIT_WAL
return pPager->jfd;
#else
return pPager->pWal ? sqlite3WalFile(pPager->pWal) : pPager->jfd;
#endif
}
/*
** Return the full pathname of the journal file.
*/
const char *sqlite3PagerJournalname(Pager *pPager){
return pPager->zJournal;
}
#ifndef SQLITE_OMIT_AUTOVACUUM
/*
** Move the page pPg to location pgno in the file.
**
** There must be no references to the page previously located at
** pgno (which we call pPgOld) though that page is allowed to be
** in cache. If the page previously located at pgno is not already
** in the rollback journal, it is not put there by by this routine.
**
** References to the page pPg remain valid. Updating any
** meta-data associated with pPg (i.e. data stored in the nExtra bytes
** allocated along with the page) is the responsibility of the caller.
**
** A transaction must be active when this routine is called. It used to be
** required that a statement transaction was not active, but this restriction
** has been removed (CREATE INDEX needs to move a page when a statement
** transaction is active).
**
** If the fourth argument, isCommit, is non-zero, then this page is being
** moved as part of a database reorganization just before the transaction
** is being committed. In this case, it is guaranteed that the database page
** pPg refers to will not be written to again within this transaction.
**
** This function may return SQLITE_NOMEM or an IO error code if an error
** occurs. Otherwise, it returns SQLITE_OK.
*/
int sqlite3PagerMovepage(Pager *pPager, DbPage *pPg, Pgno pgno, int isCommit){
PgHdr *pPgOld; /* The page being overwritten. */
Pgno needSyncPgno = 0; /* Old value of pPg->pgno, if sync is required */
int rc; /* Return code */
Pgno origPgno; /* The original page number */
assert( pPg->nRef>0 );
assert( pPager->eState==PAGER_WRITER_CACHEMOD
|| pPager->eState==PAGER_WRITER_DBMOD
);
assert( assert_pager_state(pPager) );
/* In order to be able to rollback, an in-memory database must journal
** the page we are moving from.
*/
assert( pPager->tempFile || !MEMDB );
if( pPager->tempFile ){
rc = sqlite3PagerWrite(pPg);
if( rc ) return rc;
}
/* If the page being moved is dirty and has not been saved by the latest
** savepoint, then save the current contents of the page into the
** sub-journal now. This is required to handle the following scenario:
**
** BEGIN;
** <journal page X, then modify it in memory>
** SAVEPOINT one;
** <Move page X to location Y>
** ROLLBACK TO one;
**
** If page X were not written to the sub-journal here, it would not
** be possible to restore its contents when the "ROLLBACK TO one"
** statement were is processed.
**
** subjournalPage() may need to allocate space to store pPg->pgno into
** one or more savepoint bitvecs. This is the reason this function
** may return SQLITE_NOMEM.
*/
if( (pPg->flags & PGHDR_DIRTY)!=0
&& SQLITE_OK!=(rc = subjournalPageIfRequired(pPg))
){
return rc;
}
PAGERTRACE(("MOVE %d page %d (needSync=%d) moves to %d\n",
PAGERID(pPager), pPg->pgno, (pPg->flags&PGHDR_NEED_SYNC)?1:0, pgno));
IOTRACE(("MOVE %p %d %d\n", pPager, pPg->pgno, pgno))
/* If the journal needs to be sync()ed before page pPg->pgno can
** be written to, store pPg->pgno in local variable needSyncPgno.
**
** If the isCommit flag is set, there is no need to remember that
** the journal needs to be sync()ed before database page pPg->pgno
** can be written to. The caller has already promised not to write to it.
*/
if( (pPg->flags&PGHDR_NEED_SYNC) && !isCommit ){
needSyncPgno = pPg->pgno;
assert( pPager->journalMode==PAGER_JOURNALMODE_OFF ||
pageInJournal(pPager, pPg) || pPg->pgno>pPager->dbOrigSize );
assert( pPg->flags&PGHDR_DIRTY );
}
/* If the cache contains a page with page-number pgno, remove it
** from its hash chain. Also, if the PGHDR_NEED_SYNC flag was set for
** page pgno before the 'move' operation, it needs to be retained
** for the page moved there.
*/
pPg->flags &= ~PGHDR_NEED_SYNC;
pPgOld = sqlite3PagerLookup(pPager, pgno);
assert( !pPgOld || pPgOld->nRef==1 || CORRUPT_DB );
if( pPgOld ){
if( NEVER(pPgOld->nRef>1) ){
sqlite3PagerUnrefNotNull(pPgOld);
return SQLITE_CORRUPT_BKPT;
}
pPg->flags |= (pPgOld->flags&PGHDR_NEED_SYNC);
if( pPager->tempFile ){
/* Do not discard pages from an in-memory database since we might
** need to rollback later. Just move the page out of the way. */
sqlite3PcacheMove(pPgOld, pPager->dbSize+1);
}else{
sqlite3PcacheDrop(pPgOld);
}
}
origPgno = pPg->pgno;
sqlite3PcacheMove(pPg, pgno);
sqlite3PcacheMakeDirty(pPg);
/* For an in-memory database, make sure the original page continues
** to exist, in case the transaction needs to roll back. Use pPgOld
** as the original page since it has already been allocated.
*/
if( pPager->tempFile && pPgOld ){
sqlite3PcacheMove(pPgOld, origPgno);
sqlite3PagerUnrefNotNull(pPgOld);
}
if( needSyncPgno ){
/* If needSyncPgno is non-zero, then the journal file needs to be
** sync()ed before any data is written to database file page needSyncPgno.
** Currently, no such page exists in the page-cache and the
** "is journaled" bitvec flag has been set. This needs to be remedied by
** loading the page into the pager-cache and setting the PGHDR_NEED_SYNC
** flag.
**
** If the attempt to load the page into the page-cache fails, (due
** to a malloc() or IO failure), clear the bit in the pInJournal[]
** array. Otherwise, if the page is loaded and written again in
** this transaction, it may be written to the database file before
** it is synced into the journal file. This way, it may end up in
** the journal file twice, but that is not a problem.
*/
PgHdr *pPgHdr;
rc = sqlite3PagerGet(pPager, needSyncPgno, &pPgHdr, 0);
if( rc!=SQLITE_OK ){
if( needSyncPgno<=pPager->dbOrigSize ){
assert( pPager->pTmpSpace!=0 );
sqlite3BitvecClear(pPager->pInJournal, needSyncPgno, pPager->pTmpSpace);
}
return rc;
}
pPgHdr->flags |= PGHDR_NEED_SYNC;
sqlite3PcacheMakeDirty(pPgHdr);
sqlite3PagerUnrefNotNull(pPgHdr);
}
return SQLITE_OK;
}
#endif
/*
** The page handle passed as the first argument refers to a dirty page
** with a page number other than iNew. This function changes the page's
** page number to iNew and sets the value of the PgHdr.flags field to
** the value passed as the third parameter.
*/
void sqlite3PagerRekey(DbPage *pPg, Pgno iNew, u16 flags){
assert( pPg->pgno!=iNew );
pPg->flags = flags;
sqlite3PcacheMove(pPg, iNew);
}
/*
** Return a pointer to the data for the specified page.
*/
void *sqlite3PagerGetData(DbPage *pPg){
assert( pPg->nRef>0 || pPg->pPager->memDb );
return pPg->pData;
}
/*
** Return a pointer to the Pager.nExtra bytes of "extra" space
** allocated along with the specified page.
*/
void *sqlite3PagerGetExtra(DbPage *pPg){
return pPg->pExtra;
}
/*
** Get/set the locking-mode for this pager. Parameter eMode must be one
** of PAGER_LOCKINGMODE_QUERY, PAGER_LOCKINGMODE_NORMAL or
** PAGER_LOCKINGMODE_EXCLUSIVE. If the parameter is not _QUERY, then
** the locking-mode is set to the value specified.
**
** The returned value is either PAGER_LOCKINGMODE_NORMAL or
** PAGER_LOCKINGMODE_EXCLUSIVE, indicating the current (possibly updated)
** locking-mode.
*/
int sqlite3PagerLockingMode(Pager *pPager, int eMode){
assert( eMode==PAGER_LOCKINGMODE_QUERY
|| eMode==PAGER_LOCKINGMODE_NORMAL
|| eMode==PAGER_LOCKINGMODE_EXCLUSIVE );
assert( PAGER_LOCKINGMODE_QUERY<0 );
assert( PAGER_LOCKINGMODE_NORMAL>=0 && PAGER_LOCKINGMODE_EXCLUSIVE>=0 );
assert( pPager->exclusiveMode || 0==sqlite3WalHeapMemory(pPager->pWal) );
if( eMode>=0 && !pPager->tempFile && !sqlite3WalHeapMemory(pPager->pWal) ){
pPager->exclusiveMode = (u8)eMode;
}
return (int)pPager->exclusiveMode;
}
/*
** Set the journal-mode for this pager. Parameter eMode must be one of:
**
** PAGER_JOURNALMODE_DELETE
** PAGER_JOURNALMODE_TRUNCATE
** PAGER_JOURNALMODE_PERSIST
** PAGER_JOURNALMODE_OFF
** PAGER_JOURNALMODE_MEMORY
** PAGER_JOURNALMODE_WAL
**
** The journalmode is set to the value specified if the change is allowed.
** The change may be disallowed for the following reasons:
**
** * An in-memory database can only have its journal_mode set to _OFF
** or _MEMORY.
**
** * Temporary databases cannot have _WAL journalmode.
**
** The returned indicate the current (possibly updated) journal-mode.
*/
int sqlite3PagerSetJournalMode(Pager *pPager, int eMode){
u8 eOld = pPager->journalMode; /* Prior journalmode */
/* The eMode parameter is always valid */
assert( eMode==PAGER_JOURNALMODE_DELETE /* 0 */
|| eMode==PAGER_JOURNALMODE_PERSIST /* 1 */
|| eMode==PAGER_JOURNALMODE_OFF /* 2 */
|| eMode==PAGER_JOURNALMODE_TRUNCATE /* 3 */
|| eMode==PAGER_JOURNALMODE_MEMORY /* 4 */
|| eMode==PAGER_JOURNALMODE_WAL /* 5 */ );
/* This routine is only called from the OP_JournalMode opcode, and
** the logic there will never allow a temporary file to be changed
** to WAL mode.
*/
assert( pPager->tempFile==0 || eMode!=PAGER_JOURNALMODE_WAL );
/* Do allow the journalmode of an in-memory database to be set to
** anything other than MEMORY or OFF
*/
if( MEMDB ){
assert( eOld==PAGER_JOURNALMODE_MEMORY || eOld==PAGER_JOURNALMODE_OFF );
if( eMode!=PAGER_JOURNALMODE_MEMORY && eMode!=PAGER_JOURNALMODE_OFF ){
eMode = eOld;
}
}
if( eMode!=eOld ){
/* Change the journal mode. */
assert( pPager->eState!=PAGER_ERROR );
pPager->journalMode = (u8)eMode;
/* When transistioning from TRUNCATE or PERSIST to any other journal
** mode except WAL, unless the pager is in locking_mode=exclusive mode,
** delete the journal file.
*/
assert( (PAGER_JOURNALMODE_TRUNCATE & 5)==1 );
assert( (PAGER_JOURNALMODE_PERSIST & 5)==1 );
assert( (PAGER_JOURNALMODE_DELETE & 5)==0 );
assert( (PAGER_JOURNALMODE_MEMORY & 5)==4 );
assert( (PAGER_JOURNALMODE_OFF & 5)==0 );
assert( (PAGER_JOURNALMODE_WAL & 5)==5 );
assert( isOpen(pPager->fd) || pPager->exclusiveMode );
if( !pPager->exclusiveMode && (eOld & 5)==1 && (eMode & 1)==0 ){
/* In this case we would like to delete the journal file. If it is
** not possible, then that is not a problem. Deleting the journal file
** here is an optimization only.
**
** Before deleting the journal file, obtain a RESERVED lock on the
** database file. This ensures that the journal file is not deleted
** while it is in use by some other client.
*/
sqlite3OsClose(pPager->jfd);
if( pPager->eLock>=RESERVED_LOCK ){
sqlite3OsDelete(pPager->pVfs, pPager->zJournal, 0);
}else{
int rc = SQLITE_OK;
int state = pPager->eState;
assert( state==PAGER_OPEN || state==PAGER_READER );
if( state==PAGER_OPEN ){
rc = sqlite3PagerSharedLock(pPager);
}
if( pPager->eState==PAGER_READER ){
assert( rc==SQLITE_OK );
rc = pagerLockDb(pPager, RESERVED_LOCK);
}
if( rc==SQLITE_OK ){
sqlite3OsDelete(pPager->pVfs, pPager->zJournal, 0);
}
if( rc==SQLITE_OK && state==PAGER_READER ){
pagerUnlockDb(pPager, SHARED_LOCK);
}else if( state==PAGER_OPEN ){
pager_unlock(pPager);
}
assert( state==pPager->eState );
}
}else if( eMode==PAGER_JOURNALMODE_OFF ){
sqlite3OsClose(pPager->jfd);
}
}
/* Return the new journal mode */
return (int)pPager->journalMode;
}
/*
** Return the current journal mode.
*/
int sqlite3PagerGetJournalMode(Pager *pPager){
return (int)pPager->journalMode;
}
/*
** Return TRUE if the pager is in a state where it is OK to change the
** journalmode. Journalmode changes can only happen when the database
** is unmodified.
*/
int sqlite3PagerOkToChangeJournalMode(Pager *pPager){
assert( assert_pager_state(pPager) );
if( pPager->eState>=PAGER_WRITER_CACHEMOD ) return 0;
if( NEVER(isOpen(pPager->jfd) && pPager->journalOff>0) ) return 0;
return 1;
}
/*
** Get/set the size-limit used for persistent journal files.
**
** Setting the size limit to -1 means no limit is enforced.
** An attempt to set a limit smaller than -1 is a no-op.
*/
i64 sqlite3PagerJournalSizeLimit(Pager *pPager, i64 iLimit){
if( iLimit>=-1 ){
pPager->journalSizeLimit = iLimit;
sqlite3WalLimit(pPager->pWal, iLimit);
}
return pPager->journalSizeLimit;
}
/*
** Return a pointer to the pPager->pBackup variable. The backup module
** in backup.c maintains the content of this variable. This module
** uses it opaquely as an argument to sqlite3BackupRestart() and
** sqlite3BackupUpdate() only.
*/
sqlite3_backup **sqlite3PagerBackupPtr(Pager *pPager){
return &pPager->pBackup;
}
#ifndef SQLITE_OMIT_VACUUM
/*
** Unless this is an in-memory or temporary database, clear the pager cache.
*/
void sqlite3PagerClearCache(Pager *pPager){
assert( MEMDB==0 || pPager->tempFile );
if( pPager->tempFile==0 ) pager_reset(pPager);
}
#endif
#ifndef SQLITE_OMIT_WAL
/*
** This function is called when the user invokes "PRAGMA wal_checkpoint",
** "PRAGMA wal_blocking_checkpoint" or calls the sqlite3_wal_checkpoint()
** or wal_blocking_checkpoint() API functions.
**
** Parameter eMode is one of SQLITE_CHECKPOINT_PASSIVE, FULL or RESTART.
*/
int sqlite3PagerCheckpoint(
Pager *pPager, /* Checkpoint on this pager */
sqlite3 *db, /* Db handle used to check for interrupts */
int eMode, /* Type of checkpoint */
int *pnLog, /* OUT: Final number of frames in log */
int *pnCkpt /* OUT: Final number of checkpointed frames */
){
int rc = SQLITE_OK;
if( pPager->pWal==0 && pPager->journalMode==PAGER_JOURNALMODE_WAL ){
/* This only happens when a database file is zero bytes in size opened and
** then "PRAGMA journal_mode=WAL" is run and then sqlite3_wal_checkpoint()
** is invoked without any intervening transactions. We need to start
** a transaction to initialize pWal. The PRAGMA table_list statement is
** used for this since it starts transactions on every database file,
** including all ATTACHed databases. This seems expensive for a single
** sqlite3_wal_checkpoint() call, but it happens very rarely.
** https://sqlite.org/forum/forumpost/fd0f19d229156939
*/
sqlite3_exec(db, "PRAGMA table_list",0,0,0);
}
if( pPager->pWal ){
rc = sqlite3WalCheckpoint(pPager->pWal, db, eMode,
(eMode==SQLITE_CHECKPOINT_PASSIVE ? 0 : pPager->xBusyHandler),
pPager->pBusyHandlerArg,
pPager->walSyncFlags, pPager->pageSize, (u8 *)pPager->pTmpSpace,
pnLog, pnCkpt
);
}
return rc;
}
int sqlite3PagerWalCallback(Pager *pPager){
return sqlite3WalCallback(pPager->pWal);
}
/*
** Return true if the underlying VFS for the given pager supports the
** primitives necessary for write-ahead logging.
*/
int sqlite3PagerWalSupported(Pager *pPager){
const sqlite3_io_methods *pMethods = pPager->fd->pMethods;
if( pPager->noLock ) return 0;
return pPager->exclusiveMode || (pMethods->iVersion>=2 && pMethods->xShmMap);
}
/*
** Attempt to take an exclusive lock on the database file. If a PENDING lock
** is obtained instead, immediately release it.
*/
static int pagerExclusiveLock(Pager *pPager){
int rc; /* Return code */
assert( pPager->eLock==SHARED_LOCK || pPager->eLock==EXCLUSIVE_LOCK );
rc = pagerLockDb(pPager, EXCLUSIVE_LOCK);
if( rc!=SQLITE_OK ){
/* If the attempt to grab the exclusive lock failed, release the
** pending lock that may have been obtained instead. */
pagerUnlockDb(pPager, SHARED_LOCK);
}
return rc;
}
/*
** Call sqlite3WalOpen() to open the WAL handle. If the pager is in
** exclusive-locking mode when this function is called, take an EXCLUSIVE
** lock on the database file and use heap-memory to store the wal-index
** in. Otherwise, use the normal shared-memory.
*/
static int pagerOpenWal(Pager *pPager){
int rc = SQLITE_OK;
assert( pPager->pWal==0 && pPager->tempFile==0 );
assert( pPager->eLock==SHARED_LOCK || pPager->eLock==EXCLUSIVE_LOCK );
/* If the pager is already in exclusive-mode, the WAL module will use
** heap-memory for the wal-index instead of the VFS shared-memory
** implementation. Take the exclusive lock now, before opening the WAL
** file, to make sure this is safe.
*/
if( pPager->exclusiveMode ){
rc = pagerExclusiveLock(pPager);
}
/* Open the connection to the log file. If this operation fails,
** (e.g. due to malloc() failure), return an error code.
*/
if( rc==SQLITE_OK ){
rc = sqlite3WalOpen(pPager->pVfs,
pPager->fd, pPager->zWal, pPager->exclusiveMode,
pPager->journalSizeLimit, &pPager->pWal
);
}
pagerFixMaplimit(pPager);
return rc;
}
/*
** The caller must be holding a SHARED lock on the database file to call
** this function.
**
** If the pager passed as the first argument is open on a real database
** file (not a temp file or an in-memory database), and the WAL file
** is not already open, make an attempt to open it now. If successful,
** return SQLITE_OK. If an error occurs or the VFS used by the pager does
** not support the xShmXXX() methods, return an error code. *pbOpen is
** not modified in either case.
**
** If the pager is open on a temp-file (or in-memory database), or if
** the WAL file is already open, set *pbOpen to 1 and return SQLITE_OK
** without doing anything.
*/
int sqlite3PagerOpenWal(
Pager *pPager, /* Pager object */
int *pbOpen /* OUT: Set to true if call is a no-op */
){
int rc = SQLITE_OK; /* Return code */
assert( assert_pager_state(pPager) );
assert( pPager->eState==PAGER_OPEN || pbOpen );
assert( pPager->eState==PAGER_READER || !pbOpen );
assert( pbOpen==0 || *pbOpen==0 );
assert( pbOpen!=0 || (!pPager->tempFile && !pPager->pWal) );
if( !pPager->tempFile && !pPager->pWal ){
if( !sqlite3PagerWalSupported(pPager) ) return SQLITE_CANTOPEN;
/* Close any rollback journal previously open */
sqlite3OsClose(pPager->jfd);
rc = pagerOpenWal(pPager);
if( rc==SQLITE_OK ){
pPager->journalMode = PAGER_JOURNALMODE_WAL;
pPager->eState = PAGER_OPEN;
}
}else{
*pbOpen = 1;
}
return rc;
}
/*
** This function is called to close the connection to the log file prior
** to switching from WAL to rollback mode.
**
** Before closing the log file, this function attempts to take an
** EXCLUSIVE lock on the database file. If this cannot be obtained, an
** error (SQLITE_BUSY) is returned and the log connection is not closed.
** If successful, the EXCLUSIVE lock is not released before returning.
*/
int sqlite3PagerCloseWal(Pager *pPager, sqlite3 *db){
int rc = SQLITE_OK;
assert( pPager->journalMode==PAGER_JOURNALMODE_WAL );
/* If the log file is not already open, but does exist in the file-system,
** it may need to be checkpointed before the connection can switch to
** rollback mode. Open it now so this can happen.
*/
if( !pPager->pWal ){
int logexists = 0;
rc = pagerLockDb(pPager, SHARED_LOCK);
if( rc==SQLITE_OK ){
rc = sqlite3OsAccess(
pPager->pVfs, pPager->zWal, SQLITE_ACCESS_EXISTS, &logexists
);
}
if( rc==SQLITE_OK && logexists ){
rc = pagerOpenWal(pPager);
}
}
/* Checkpoint and close the log. Because an EXCLUSIVE lock is held on
** the database file, the log and log-summary files will be deleted.
*/
if( rc==SQLITE_OK && pPager->pWal ){
rc = pagerExclusiveLock(pPager);
if( rc==SQLITE_OK ){
rc = sqlite3WalClose(pPager->pWal, db, pPager->walSyncFlags,
pPager->pageSize, (u8*)pPager->pTmpSpace);
pPager->pWal = 0;
pagerFixMaplimit(pPager);
if( rc && !pPager->exclusiveMode ) pagerUnlockDb(pPager, SHARED_LOCK);
}
}
return rc;
}
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
/*
** If pager pPager is a wal-mode database not in exclusive locking mode,
** invoke the sqlite3WalWriteLock() function on the associated Wal object
** with the same db and bLock parameters as were passed to this function.
** Return an SQLite error code if an error occurs, or SQLITE_OK otherwise.
*/
int sqlite3PagerWalWriteLock(Pager *pPager, int bLock){
int rc = SQLITE_OK;
if( pagerUseWal(pPager) && pPager->exclusiveMode==0 ){
rc = sqlite3WalWriteLock(pPager->pWal, bLock);
}
return rc;
}
/*
** Set the database handle used by the wal layer to determine if
** blocking locks are required.
*/
void sqlite3PagerWalDb(Pager *pPager, sqlite3 *db){
if( pagerUseWal(pPager) ){
sqlite3WalDb(pPager->pWal, db);
}
}
#endif
#ifdef SQLITE_ENABLE_SNAPSHOT
/*
** If this is a WAL database, obtain a snapshot handle for the snapshot
** currently open. Otherwise, return an error.
*/
int sqlite3PagerSnapshotGet(Pager *pPager, sqlite3_snapshot **ppSnapshot){
int rc = SQLITE_ERROR;
if( pPager->pWal ){
rc = sqlite3WalSnapshotGet(pPager->pWal, ppSnapshot);
}
return rc;
}
/*
** If this is a WAL database, store a pointer to pSnapshot. Next time a
** read transaction is opened, attempt to read from the snapshot it
** identifies. If this is not a WAL database, return an error.
*/
int sqlite3PagerSnapshotOpen(
Pager *pPager,
sqlite3_snapshot *pSnapshot
){
int rc = SQLITE_OK;
if( pPager->pWal ){
sqlite3WalSnapshotOpen(pPager->pWal, pSnapshot);
}else{
rc = SQLITE_ERROR;
}
return rc;
}
/*
** If this is a WAL database, call sqlite3WalSnapshotRecover(). If this
** is not a WAL database, return an error.
*/
int sqlite3PagerSnapshotRecover(Pager *pPager){
int rc;
if( pPager->pWal ){
rc = sqlite3WalSnapshotRecover(pPager->pWal);
}else{
rc = SQLITE_ERROR;
}
return rc;
}
/*
** The caller currently has a read transaction open on the database.
** If this is not a WAL database, SQLITE_ERROR is returned. Otherwise,
** this function takes a SHARED lock on the CHECKPOINTER slot and then
** checks if the snapshot passed as the second argument is still
** available. If so, SQLITE_OK is returned.
**
** If the snapshot is not available, SQLITE_ERROR is returned. Or, if
** the CHECKPOINTER lock cannot be obtained, SQLITE_BUSY. If any error
** occurs (any value other than SQLITE_OK is returned), the CHECKPOINTER
** lock is released before returning.
*/
int sqlite3PagerSnapshotCheck(Pager *pPager, sqlite3_snapshot *pSnapshot){
int rc;
if( pPager->pWal ){
rc = sqlite3WalSnapshotCheck(pPager->pWal, pSnapshot);
}else{
rc = SQLITE_ERROR;
}
return rc;
}
/*
** Release a lock obtained by an earlier successful call to
** sqlite3PagerSnapshotCheck().
*/
void sqlite3PagerSnapshotUnlock(Pager *pPager){
assert( pPager->pWal );
sqlite3WalSnapshotUnlock(pPager->pWal);
}
#endif /* SQLITE_ENABLE_SNAPSHOT */
#endif /* !SQLITE_OMIT_WAL */
#ifdef SQLITE_ENABLE_ZIPVFS
/*
** A read-lock must be held on the pager when this function is called. If
** the pager is in WAL mode and the WAL file currently contains one or more
** frames, return the size in bytes of the page images stored within the
** WAL frames. Otherwise, if this is not a WAL database or the WAL file
** is empty, return 0.
*/
int sqlite3PagerWalFramesize(Pager *pPager){
assert( pPager->eState>=PAGER_READER );
return sqlite3WalFramesize(pPager->pWal);
}
#endif
#endif /* SQLITE_OMIT_DISKIO */
| 299,623 | 7,739 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/hash.h | /*
** 2001 September 22
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This is the header file for the generic hash-table implementation
** used in SQLite.
*/
#ifndef SQLITE_HASH_H
#define SQLITE_HASH_H
/* Forward declarations of structures. */
typedef struct Hash Hash;
typedef struct HashElem HashElem;
/* A complete hash table is an instance of the following structure.
** The internals of this structure are intended to be opaque -- client
** code should not attempt to access or modify the fields of this structure
** directly. Change this structure only by using the routines below.
** However, some of the "procedures" and "functions" for modifying and
** accessing this structure are really macros, so we can't really make
** this structure opaque.
**
** All elements of the hash table are on a single doubly-linked list.
** Hash.first points to the head of this list.
**
** There are Hash.htsize buckets. Each bucket points to a spot in
** the global doubly-linked list. The contents of the bucket are the
** element pointed to plus the next _ht.count-1 elements in the list.
**
** Hash.htsize and Hash.ht may be zero. In that case lookup is done
** by a linear search of the global list. For small tables, the
** Hash.ht table is never allocated because if there are few elements
** in the table, it is faster to do a linear search than to manage
** the hash table.
*/
struct Hash {
unsigned int htsize; /* Number of buckets in the hash table */
unsigned int count; /* Number of entries in this table */
HashElem *first; /* The first element of the array */
struct _ht { /* the hash table */
unsigned int count; /* Number of entries with this hash */
HashElem *chain; /* Pointer to first entry with this hash */
} *ht;
};
/* Each element in the hash table is an instance of the following
** structure. All elements are stored on a single doubly-linked list.
**
** Again, this structure is intended to be opaque, but it can't really
** be opaque because it is used by macros.
*/
struct HashElem {
HashElem *next, *prev; /* Next and previous elements in the table */
void *data; /* Data associated with this element */
const char *pKey; /* Key associated with this element */
};
/*
** Access routines. To delete, insert a NULL pointer.
*/
void sqlite3HashInit(Hash*);
void *sqlite3HashInsert(Hash*, const char *pKey, void *pData);
void *sqlite3HashFind(const Hash*, const char *pKey);
void sqlite3HashClear(Hash*);
/*
** Macros for looping over all elements of a hash table. The idiom is
** like this:
**
** Hash h;
** HashElem *p;
** ...
** for(p=sqliteHashFirst(&h); p; p=sqliteHashNext(p)){
** SomeStructure *pData = sqliteHashData(p);
** // do something with pData
** }
*/
#define sqliteHashFirst(H) ((H)->first)
#define sqliteHashNext(E) ((E)->next)
#define sqliteHashData(E) ((E)->data)
/* #define sqliteHashKey(E) ((E)->pKey) // NOT USED */
/* #define sqliteHashKeysize(E) ((E)->nKey) // NOT USED */
/*
** Number of entries in a hash table
*/
#define sqliteHashCount(H) ((H)->count)
#endif /* SQLITE_HASH_H */
| 3,485 | 97 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/notify.c | /*
** 2009 March 3
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains the implementation of the sqlite3_unlock_notify()
** API method and its associated functionality.
*/
#include "third_party/sqlite3/sqliteInt.h"
#include "third_party/sqlite3/btreeInt.h"
/* Omit this entire file if SQLITE_ENABLE_UNLOCK_NOTIFY is not defined. */
#ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
/*
** Public interfaces:
**
** sqlite3ConnectionBlocked()
** sqlite3ConnectionUnlocked()
** sqlite3ConnectionClosed()
** sqlite3_unlock_notify()
*/
#define assertMutexHeld() \
assert( sqlite3_mutex_held(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN)) )
/*
** Head of a linked list of all sqlite3 objects created by this process
** for which either sqlite3.pBlockingConnection or sqlite3.pUnlockConnection
** is not NULL. This variable may only accessed while the STATIC_MAIN
** mutex is held.
*/
static sqlite3 *SQLITE_WSD sqlite3BlockedList = 0;
#ifndef NDEBUG
/*
** This function is a complex assert() that verifies the following
** properties of the blocked connections list:
**
** 1) Each entry in the list has a non-NULL value for either
** pUnlockConnection or pBlockingConnection, or both.
**
** 2) All entries in the list that share a common value for
** xUnlockNotify are grouped together.
**
** 3) If the argument db is not NULL, then none of the entries in the
** blocked connections list have pUnlockConnection or pBlockingConnection
** set to db. This is used when closing connection db.
*/
static void checkListProperties(sqlite3 *db){
sqlite3 *p;
for(p=sqlite3BlockedList; p; p=p->pNextBlocked){
int seen = 0;
sqlite3 *p2;
/* Verify property (1) */
assert( p->pUnlockConnection || p->pBlockingConnection );
/* Verify property (2) */
for(p2=sqlite3BlockedList; p2!=p; p2=p2->pNextBlocked){
if( p2->xUnlockNotify==p->xUnlockNotify ) seen = 1;
assert( p2->xUnlockNotify==p->xUnlockNotify || !seen );
assert( db==0 || p->pUnlockConnection!=db );
assert( db==0 || p->pBlockingConnection!=db );
}
}
}
#else
# define checkListProperties(x)
#endif
/*
** Remove connection db from the blocked connections list. If connection
** db is not currently a part of the list, this function is a no-op.
*/
static void removeFromBlockedList(sqlite3 *db){
sqlite3 **pp;
assertMutexHeld();
for(pp=&sqlite3BlockedList; *pp; pp = &(*pp)->pNextBlocked){
if( *pp==db ){
*pp = (*pp)->pNextBlocked;
break;
}
}
}
/*
** Add connection db to the blocked connections list. It is assumed
** that it is not already a part of the list.
*/
static void addToBlockedList(sqlite3 *db){
sqlite3 **pp;
assertMutexHeld();
for(
pp=&sqlite3BlockedList;
*pp && (*pp)->xUnlockNotify!=db->xUnlockNotify;
pp=&(*pp)->pNextBlocked
);
db->pNextBlocked = *pp;
*pp = db;
}
/*
** Obtain the STATIC_MAIN mutex.
*/
static void enterMutex(void){
sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN));
checkListProperties(0);
}
/*
** Release the STATIC_MAIN mutex.
*/
static void leaveMutex(void){
assertMutexHeld();
checkListProperties(0);
sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MAIN));
}
/*
** Register an unlock-notify callback.
**
** This is called after connection "db" has attempted some operation
** but has received an SQLITE_LOCKED error because another connection
** (call it pOther) in the same process was busy using the same shared
** cache. pOther is found by looking at db->pBlockingConnection.
**
** If there is no blocking connection, the callback is invoked immediately,
** before this routine returns.
**
** If pOther is already blocked on db, then report SQLITE_LOCKED, to indicate
** a deadlock.
**
** Otherwise, make arrangements to invoke xNotify when pOther drops
** its locks.
**
** Each call to this routine overrides any prior callbacks registered
** on the same "db". If xNotify==0 then any prior callbacks are immediately
** cancelled.
*/
int sqlite3_unlock_notify(
sqlite3 *db,
void (*xNotify)(void **, int),
void *pArg
){
int rc = SQLITE_OK;
sqlite3_mutex_enter(db->mutex);
enterMutex();
if( xNotify==0 ){
removeFromBlockedList(db);
db->pBlockingConnection = 0;
db->pUnlockConnection = 0;
db->xUnlockNotify = 0;
db->pUnlockArg = 0;
}else if( 0==db->pBlockingConnection ){
/* The blocking transaction has been concluded. Or there never was a
** blocking transaction. In either case, invoke the notify callback
** immediately.
*/
xNotify(&pArg, 1);
}else{
sqlite3 *p;
for(p=db->pBlockingConnection; p && p!=db; p=p->pUnlockConnection){}
if( p ){
rc = SQLITE_LOCKED; /* Deadlock detected. */
}else{
db->pUnlockConnection = db->pBlockingConnection;
db->xUnlockNotify = xNotify;
db->pUnlockArg = pArg;
removeFromBlockedList(db);
addToBlockedList(db);
}
}
leaveMutex();
assert( !db->mallocFailed );
sqlite3ErrorWithMsg(db, rc, (rc?"database is deadlocked":0));
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** This function is called while stepping or preparing a statement
** associated with connection db. The operation will return SQLITE_LOCKED
** to the user because it requires a lock that will not be available
** until connection pBlocker concludes its current transaction.
*/
void sqlite3ConnectionBlocked(sqlite3 *db, sqlite3 *pBlocker){
enterMutex();
if( db->pBlockingConnection==0 && db->pUnlockConnection==0 ){
addToBlockedList(db);
}
db->pBlockingConnection = pBlocker;
leaveMutex();
}
/*
** This function is called when
** the transaction opened by database db has just finished. Locks held
** by database connection db have been released.
**
** This function loops through each entry in the blocked connections
** list and does the following:
**
** 1) If the sqlite3.pBlockingConnection member of a list entry is
** set to db, then set pBlockingConnection=0.
**
** 2) If the sqlite3.pUnlockConnection member of a list entry is
** set to db, then invoke the configured unlock-notify callback and
** set pUnlockConnection=0.
**
** 3) If the two steps above mean that pBlockingConnection==0 and
** pUnlockConnection==0, remove the entry from the blocked connections
** list.
*/
void sqlite3ConnectionUnlocked(sqlite3 *db){
void (*xUnlockNotify)(void **, int) = 0; /* Unlock-notify cb to invoke */
int nArg = 0; /* Number of entries in aArg[] */
sqlite3 **pp; /* Iterator variable */
void **aArg; /* Arguments to the unlock callback */
void **aDyn = 0; /* Dynamically allocated space for aArg[] */
void *aStatic[16]; /* Starter space for aArg[]. No malloc required */
aArg = aStatic;
enterMutex(); /* Enter STATIC_MAIN mutex */
/* This loop runs once for each entry in the blocked-connections list. */
for(pp=&sqlite3BlockedList; *pp; /* no-op */ ){
sqlite3 *p = *pp;
/* Step 1. */
if( p->pBlockingConnection==db ){
p->pBlockingConnection = 0;
}
/* Step 2. */
if( p->pUnlockConnection==db ){
assert( p->xUnlockNotify );
if( p->xUnlockNotify!=xUnlockNotify && nArg!=0 ){
xUnlockNotify(aArg, nArg);
nArg = 0;
}
sqlite3BeginBenignMalloc();
assert( aArg==aDyn || (aDyn==0 && aArg==aStatic) );
assert( nArg<=(int)ArraySize(aStatic) || aArg==aDyn );
if( (!aDyn && nArg==(int)ArraySize(aStatic))
|| (aDyn && nArg==(int)(sqlite3MallocSize(aDyn)/sizeof(void*)))
){
/* The aArg[] array needs to grow. */
void **pNew = (void **)sqlite3Malloc(nArg*sizeof(void *)*2);
if( pNew ){
memcpy(pNew, aArg, nArg*sizeof(void *));
sqlite3_free(aDyn);
aDyn = aArg = pNew;
}else{
/* This occurs when the array of context pointers that need to
** be passed to the unlock-notify callback is larger than the
** aStatic[] array allocated on the stack and the attempt to
** allocate a larger array from the heap has failed.
**
** This is a difficult situation to handle. Returning an error
** code to the caller is insufficient, as even if an error code
** is returned the transaction on connection db will still be
** closed and the unlock-notify callbacks on blocked connections
** will go unissued. This might cause the application to wait
** indefinitely for an unlock-notify callback that will never
** arrive.
**
** Instead, invoke the unlock-notify callback with the context
** array already accumulated. We can then clear the array and
** begin accumulating any further context pointers without
** requiring any dynamic allocation. This is sub-optimal because
** it means that instead of one callback with a large array of
** context pointers the application will receive two or more
** callbacks with smaller arrays of context pointers, which will
** reduce the applications ability to prioritize multiple
** connections. But it is the best that can be done under the
** circumstances.
*/
xUnlockNotify(aArg, nArg);
nArg = 0;
}
}
sqlite3EndBenignMalloc();
aArg[nArg++] = p->pUnlockArg;
xUnlockNotify = p->xUnlockNotify;
p->pUnlockConnection = 0;
p->xUnlockNotify = 0;
p->pUnlockArg = 0;
}
/* Step 3. */
if( p->pBlockingConnection==0 && p->pUnlockConnection==0 ){
/* Remove connection p from the blocked connections list. */
*pp = p->pNextBlocked;
p->pNextBlocked = 0;
}else{
pp = &p->pNextBlocked;
}
}
if( nArg!=0 ){
xUnlockNotify(aArg, nArg);
}
sqlite3_free(aDyn);
leaveMutex(); /* Leave STATIC_MAIN mutex */
}
/*
** This is called when the database connection passed as an argument is
** being closed. The connection is removed from the blocked list.
*/
void sqlite3ConnectionClosed(sqlite3 *db){
sqlite3ConnectionUnlocked(db);
enterMutex();
removeFromBlockedList(db);
checkListProperties(db);
leaveMutex();
}
#endif
| 10,659 | 333 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/update.shell.c | #include "third_party/sqlite3/update.c"
| 40 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_unicode.shell.c | #include "third_party/sqlite3/fts3_unicode.c"
| 46 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/resolve.c | /*
** 2008 August 18
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains routines used for walking the parser tree and
** resolve all identifiers by associating them with a particular
** table and column.
*/
#include "third_party/sqlite3/sqliteInt.h"
/*
** Magic table number to mean the EXCLUDED table in an UPSERT statement.
*/
#define EXCLUDED_TABLE_NUMBER 2
/*
** Walk the expression tree pExpr and increase the aggregate function
** depth (the Expr.op2 field) by N on every TK_AGG_FUNCTION node.
** This needs to occur when copying a TK_AGG_FUNCTION node from an
** outer query into an inner subquery.
**
** incrAggFunctionDepth(pExpr,n) is the main routine. incrAggDepth(..)
** is a helper function - a callback for the tree walker.
**
** See also the sqlite3WindowExtraAggFuncDepth() routine in window.c
*/
static int incrAggDepth(Walker *pWalker, Expr *pExpr){
if( pExpr->op==TK_AGG_FUNCTION ) pExpr->op2 += pWalker->u.n;
return WRC_Continue;
}
static void incrAggFunctionDepth(Expr *pExpr, int N){
if( N>0 ){
Walker w;
memset(&w, 0, sizeof(w));
w.xExprCallback = incrAggDepth;
w.u.n = N;
sqlite3WalkExpr(&w, pExpr);
}
}
/*
** Turn the pExpr expression into an alias for the iCol-th column of the
** result set in pEList.
**
** If the reference is followed by a COLLATE operator, then make sure
** the COLLATE operator is preserved. For example:
**
** SELECT a+b, c+d FROM t1 ORDER BY 1 COLLATE nocase;
**
** Should be transformed into:
**
** SELECT a+b, c+d FROM t1 ORDER BY (a+b) COLLATE nocase;
**
** The nSubquery parameter specifies how many levels of subquery the
** alias is removed from the original expression. The usual value is
** zero but it might be more if the alias is contained within a subquery
** of the original expression. The Expr.op2 field of TK_AGG_FUNCTION
** structures must be increased by the nSubquery amount.
*/
static void resolveAlias(
Parse *pParse, /* Parsing context */
ExprList *pEList, /* A result set */
int iCol, /* A column in the result set. 0..pEList->nExpr-1 */
Expr *pExpr, /* Transform this into an alias to the result set */
int nSubquery /* Number of subqueries that the label is moving */
){
Expr *pOrig; /* The iCol-th column of the result set */
Expr *pDup; /* Copy of pOrig */
sqlite3 *db; /* The database connection */
assert( iCol>=0 && iCol<pEList->nExpr );
pOrig = pEList->a[iCol].pExpr;
assert( pOrig!=0 );
db = pParse->db;
pDup = sqlite3ExprDup(db, pOrig, 0);
if( db->mallocFailed ){
sqlite3ExprDelete(db, pDup);
pDup = 0;
}else{
Expr temp;
incrAggFunctionDepth(pDup, nSubquery);
if( pExpr->op==TK_COLLATE ){
assert( !ExprHasProperty(pExpr, EP_IntValue) );
pDup = sqlite3ExprAddCollateString(pParse, pDup, pExpr->u.zToken);
}
memcpy(&temp, pDup, sizeof(Expr));
memcpy(pDup, pExpr, sizeof(Expr));
memcpy(pExpr, &temp, sizeof(Expr));
if( ExprHasProperty(pExpr, EP_WinFunc) ){
if( ALWAYS(pExpr->y.pWin!=0) ){
pExpr->y.pWin->pOwner = pExpr;
}
}
sqlite3ExprDeferredDelete(pParse, pDup);
}
}
/*
** Subqueries stores the original database, table and column names for their
** result sets in ExprList.a[].zSpan, in the form "DATABASE.TABLE.COLUMN".
** Check to see if the zSpan given to this routine matches the zDb, zTab,
** and zCol. If any of zDb, zTab, and zCol are NULL then those fields will
** match anything.
*/
int sqlite3MatchEName(
const struct ExprList_item *pItem,
const char *zCol,
const char *zTab,
const char *zDb
){
int n;
const char *zSpan;
if( pItem->fg.eEName!=ENAME_TAB ) return 0;
zSpan = pItem->zEName;
for(n=0; ALWAYS(zSpan[n]) && zSpan[n]!='.'; n++){}
if( zDb && (sqlite3StrNICmp(zSpan, zDb, n)!=0 || zDb[n]!=0) ){
return 0;
}
zSpan += n+1;
for(n=0; ALWAYS(zSpan[n]) && zSpan[n]!='.'; n++){}
if( zTab && (sqlite3StrNICmp(zSpan, zTab, n)!=0 || zTab[n]!=0) ){
return 0;
}
zSpan += n+1;
if( zCol && sqlite3StrICmp(zSpan, zCol)!=0 ){
return 0;
}
return 1;
}
/*
** Return TRUE if the double-quoted string mis-feature should be supported.
*/
static int areDoubleQuotedStringsEnabled(sqlite3 *db, NameContext *pTopNC){
if( db->init.busy ) return 1; /* Always support for legacy schemas */
if( pTopNC->ncFlags & NC_IsDDL ){
/* Currently parsing a DDL statement */
if( sqlite3WritableSchema(db) && (db->flags & SQLITE_DqsDML)!=0 ){
return 1;
}
return (db->flags & SQLITE_DqsDDL)!=0;
}else{
/* Currently parsing a DML statement */
return (db->flags & SQLITE_DqsDML)!=0;
}
}
/*
** The argument is guaranteed to be a non-NULL Expr node of type TK_COLUMN.
** return the appropriate colUsed mask.
*/
Bitmask sqlite3ExprColUsed(Expr *pExpr){
int n;
Table *pExTab;
n = pExpr->iColumn;
assert( ExprUseYTab(pExpr) );
pExTab = pExpr->y.pTab;
assert( pExTab!=0 );
if( (pExTab->tabFlags & TF_HasGenerated)!=0
&& (pExTab->aCol[n].colFlags & COLFLAG_GENERATED)!=0
){
testcase( pExTab->nCol==BMS-1 );
testcase( pExTab->nCol==BMS );
return pExTab->nCol>=BMS ? ALLBITS : MASKBIT(pExTab->nCol)-1;
}else{
testcase( n==BMS-1 );
testcase( n==BMS );
if( n>=BMS ) n = BMS-1;
return ((Bitmask)1)<<n;
}
}
/*
** Create a new expression term for the column specified by pMatch and
** iColumn. Append this new expression term to the FULL JOIN Match set
** in *ppList. Create a new *ppList if this is the first term in the
** set.
*/
static void extendFJMatch(
Parse *pParse, /* Parsing context */
ExprList **ppList, /* ExprList to extend */
SrcItem *pMatch, /* Source table containing the column */
i16 iColumn /* The column number */
){
Expr *pNew = sqlite3ExprAlloc(pParse->db, TK_COLUMN, 0, 0);
if( pNew ){
pNew->iTable = pMatch->iCursor;
pNew->iColumn = iColumn;
pNew->y.pTab = pMatch->pTab;
assert( (pMatch->fg.jointype & (JT_LEFT|JT_LTORJ))!=0 );
ExprSetProperty(pNew, EP_CanBeNull);
*ppList = sqlite3ExprListAppend(pParse, *ppList, pNew);
}
}
/*
** Given the name of a column of the form X.Y.Z or Y.Z or just Z, look up
** that name in the set of source tables in pSrcList and make the pExpr
** expression node refer back to that source column. The following changes
** are made to pExpr:
**
** pExpr->iDb Set the index in db->aDb[] of the database X
** (even if X is implied).
** pExpr->iTable Set to the cursor number for the table obtained
** from pSrcList.
** pExpr->y.pTab Points to the Table structure of X.Y (even if
** X and/or Y are implied.)
** pExpr->iColumn Set to the column number within the table.
** pExpr->op Set to TK_COLUMN.
** pExpr->pLeft Any expression this points to is deleted
** pExpr->pRight Any expression this points to is deleted.
**
** The zDb variable is the name of the database (the "X"). This value may be
** NULL meaning that name is of the form Y.Z or Z. Any available database
** can be used. The zTable variable is the name of the table (the "Y"). This
** value can be NULL if zDb is also NULL. If zTable is NULL it
** means that the form of the name is Z and that columns from any table
** can be used.
**
** If the name cannot be resolved unambiguously, leave an error message
** in pParse and return WRC_Abort. Return WRC_Prune on success.
*/
static int lookupName(
Parse *pParse, /* The parsing context */
const char *zDb, /* Name of the database containing table, or NULL */
const char *zTab, /* Name of table containing column, or NULL */
const char *zCol, /* Name of the column. */
NameContext *pNC, /* The name context used to resolve the name */
Expr *pExpr /* Make this EXPR node point to the selected column */
){
int i, j; /* Loop counters */
int cnt = 0; /* Number of matching column names */
int cntTab = 0; /* Number of matching table names */
int nSubquery = 0; /* How many levels of subquery */
sqlite3 *db = pParse->db; /* The database connection */
SrcItem *pItem; /* Use for looping over pSrcList items */
SrcItem *pMatch = 0; /* The matching pSrcList item */
NameContext *pTopNC = pNC; /* First namecontext in the list */
Schema *pSchema = 0; /* Schema of the expression */
int eNewExprOp = TK_COLUMN; /* New value for pExpr->op on success */
Table *pTab = 0; /* Table holding the row */
Column *pCol; /* A column of pTab */
ExprList *pFJMatch = 0; /* Matches for FULL JOIN .. USING */
assert( pNC ); /* the name context cannot be NULL. */
assert( zCol ); /* The Z in X.Y.Z cannot be NULL */
assert( zDb==0 || zTab!=0 );
assert( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) );
/* Initialize the node to no-match */
pExpr->iTable = -1;
ExprSetVVAProperty(pExpr, EP_NoReduce);
/* Translate the schema name in zDb into a pointer to the corresponding
** schema. If not found, pSchema will remain NULL and nothing will match
** resulting in an appropriate error message toward the end of this routine
*/
if( zDb ){
testcase( pNC->ncFlags & NC_PartIdx );
testcase( pNC->ncFlags & NC_IsCheck );
if( (pNC->ncFlags & (NC_PartIdx|NC_IsCheck))!=0 ){
/* Silently ignore database qualifiers inside CHECK constraints and
** partial indices. Do not raise errors because that might break
** legacy and because it does not hurt anything to just ignore the
** database name. */
zDb = 0;
}else{
for(i=0; i<db->nDb; i++){
assert( db->aDb[i].zDbSName );
if( sqlite3StrICmp(db->aDb[i].zDbSName,zDb)==0 ){
pSchema = db->aDb[i].pSchema;
break;
}
}
if( i==db->nDb && sqlite3StrICmp("main", zDb)==0 ){
/* This branch is taken when the main database has been renamed
** using SQLITE_DBCONFIG_MAINDBNAME. */
pSchema = db->aDb[0].pSchema;
zDb = db->aDb[0].zDbSName;
}
}
}
/* Start at the inner-most context and move outward until a match is found */
assert( pNC && cnt==0 );
do{
ExprList *pEList;
SrcList *pSrcList = pNC->pSrcList;
if( pSrcList ){
for(i=0, pItem=pSrcList->a; i<pSrcList->nSrc; i++, pItem++){
u8 hCol;
pTab = pItem->pTab;
assert( pTab!=0 && pTab->zName!=0 );
assert( pTab->nCol>0 || pParse->nErr );
assert( (int)pItem->fg.isNestedFrom == IsNestedFrom(pItem->pSelect) );
if( pItem->fg.isNestedFrom ){
/* In this case, pItem is a subquery that has been formed from a
** parenthesized subset of the FROM clause terms. Example:
** .... FROM t1 LEFT JOIN (t2 RIGHT JOIN t3 USING(x)) USING(y) ...
** \_________________________/
** This pItem -------------^
*/
int hit = 0;
assert( pItem->pSelect!=0 );
pEList = pItem->pSelect->pEList;
assert( pEList!=0 );
assert( pEList->nExpr==pTab->nCol );
for(j=0; j<pEList->nExpr; j++){
if( !sqlite3MatchEName(&pEList->a[j], zCol, zTab, zDb) ){
continue;
}
if( cnt>0 ){
if( pItem->fg.isUsing==0
|| sqlite3IdListIndex(pItem->u3.pUsing, zCol)<0
){
/* Two or more tables have the same column name which is
** not joined by USING. This is an error. Signal as much
** by clearing pFJMatch and letting cnt go above 1. */
sqlite3ExprListDelete(db, pFJMatch);
pFJMatch = 0;
}else
if( (pItem->fg.jointype & JT_RIGHT)==0 ){
/* An INNER or LEFT JOIN. Use the left-most table */
continue;
}else
if( (pItem->fg.jointype & JT_LEFT)==0 ){
/* A RIGHT JOIN. Use the right-most table */
cnt = 0;
sqlite3ExprListDelete(db, pFJMatch);
pFJMatch = 0;
}else{
/* For a FULL JOIN, we must construct a coalesce() func */
extendFJMatch(pParse, &pFJMatch, pMatch, pExpr->iColumn);
}
}
cnt++;
cntTab = 2;
pMatch = pItem;
pExpr->iColumn = j;
pEList->a[j].fg.bUsed = 1;
hit = 1;
if( pEList->a[j].fg.bUsingTerm ) break;
}
if( hit || zTab==0 ) continue;
}
assert( zDb==0 || zTab!=0 );
if( zTab ){
const char *zTabName;
if( zDb ){
if( pTab->pSchema!=pSchema ) continue;
if( pSchema==0 && strcmp(zDb,"*")!=0 ) continue;
}
zTabName = pItem->zAlias ? pItem->zAlias : pTab->zName;
assert( zTabName!=0 );
if( sqlite3StrICmp(zTabName, zTab)!=0 ){
continue;
}
assert( ExprUseYTab(pExpr) );
if( IN_RENAME_OBJECT && pItem->zAlias ){
sqlite3RenameTokenRemap(pParse, 0, (void*)&pExpr->y.pTab);
}
}
hCol = sqlite3StrIHash(zCol);
for(j=0, pCol=pTab->aCol; j<pTab->nCol; j++, pCol++){
if( pCol->hName==hCol
&& sqlite3StrICmp(pCol->zCnName, zCol)==0
){
if( cnt>0 ){
if( pItem->fg.isUsing==0
|| sqlite3IdListIndex(pItem->u3.pUsing, zCol)<0
){
/* Two or more tables have the same column name which is
** not joined by USING. This is an error. Signal as much
** by clearing pFJMatch and letting cnt go above 1. */
sqlite3ExprListDelete(db, pFJMatch);
pFJMatch = 0;
}else
if( (pItem->fg.jointype & JT_RIGHT)==0 ){
/* An INNER or LEFT JOIN. Use the left-most table */
continue;
}else
if( (pItem->fg.jointype & JT_LEFT)==0 ){
/* A RIGHT JOIN. Use the right-most table */
cnt = 0;
sqlite3ExprListDelete(db, pFJMatch);
pFJMatch = 0;
}else{
/* For a FULL JOIN, we must construct a coalesce() func */
extendFJMatch(pParse, &pFJMatch, pMatch, pExpr->iColumn);
}
}
cnt++;
pMatch = pItem;
/* Substitute the rowid (column -1) for the INTEGER PRIMARY KEY */
pExpr->iColumn = j==pTab->iPKey ? -1 : (i16)j;
if( pItem->fg.isNestedFrom ){
sqlite3SrcItemColumnUsed(pItem, j);
}
break;
}
}
if( 0==cnt && VisibleRowid(pTab) ){
cntTab++;
pMatch = pItem;
}
}
if( pMatch ){
pExpr->iTable = pMatch->iCursor;
assert( ExprUseYTab(pExpr) );
pExpr->y.pTab = pMatch->pTab;
if( (pMatch->fg.jointype & (JT_LEFT|JT_LTORJ))!=0 ){
ExprSetProperty(pExpr, EP_CanBeNull);
}
pSchema = pExpr->y.pTab->pSchema;
}
} /* if( pSrcList ) */
#if !defined(SQLITE_OMIT_TRIGGER) || !defined(SQLITE_OMIT_UPSERT)
/* If we have not already resolved the name, then maybe
** it is a new.* or old.* trigger argument reference. Or
** maybe it is an excluded.* from an upsert. Or maybe it is
** a reference in the RETURNING clause to a table being modified.
*/
if( cnt==0 && zDb==0 ){
pTab = 0;
#ifndef SQLITE_OMIT_TRIGGER
if( pParse->pTriggerTab!=0 ){
int op = pParse->eTriggerOp;
assert( op==TK_DELETE || op==TK_UPDATE || op==TK_INSERT );
if( pParse->bReturning ){
if( (pNC->ncFlags & NC_UBaseReg)!=0
&& (zTab==0 || sqlite3StrICmp(zTab,pParse->pTriggerTab->zName)==0)
){
pExpr->iTable = op!=TK_DELETE;
pTab = pParse->pTriggerTab;
}
}else if( op!=TK_DELETE && zTab && sqlite3StrICmp("new",zTab) == 0 ){
pExpr->iTable = 1;
pTab = pParse->pTriggerTab;
}else if( op!=TK_INSERT && zTab && sqlite3StrICmp("old",zTab)==0 ){
pExpr->iTable = 0;
pTab = pParse->pTriggerTab;
}
}
#endif /* SQLITE_OMIT_TRIGGER */
#ifndef SQLITE_OMIT_UPSERT
if( (pNC->ncFlags & NC_UUpsert)!=0 && zTab!=0 ){
Upsert *pUpsert = pNC->uNC.pUpsert;
if( pUpsert && sqlite3StrICmp("excluded",zTab)==0 ){
pTab = pUpsert->pUpsertSrc->a[0].pTab;
pExpr->iTable = EXCLUDED_TABLE_NUMBER;
}
}
#endif /* SQLITE_OMIT_UPSERT */
if( pTab ){
int iCol;
u8 hCol = sqlite3StrIHash(zCol);
pSchema = pTab->pSchema;
cntTab++;
for(iCol=0, pCol=pTab->aCol; iCol<pTab->nCol; iCol++, pCol++){
if( pCol->hName==hCol
&& sqlite3StrICmp(pCol->zCnName, zCol)==0
){
if( iCol==pTab->iPKey ){
iCol = -1;
}
break;
}
}
if( iCol>=pTab->nCol && sqlite3IsRowid(zCol) && VisibleRowid(pTab) ){
/* IMP: R-51414-32910 */
iCol = -1;
}
if( iCol<pTab->nCol ){
cnt++;
pMatch = 0;
#ifndef SQLITE_OMIT_UPSERT
if( pExpr->iTable==EXCLUDED_TABLE_NUMBER ){
testcase( iCol==(-1) );
assert( ExprUseYTab(pExpr) );
if( IN_RENAME_OBJECT ){
pExpr->iColumn = iCol;
pExpr->y.pTab = pTab;
eNewExprOp = TK_COLUMN;
}else{
pExpr->iTable = pNC->uNC.pUpsert->regData +
sqlite3TableColumnToStorage(pTab, iCol);
eNewExprOp = TK_REGISTER;
}
}else
#endif /* SQLITE_OMIT_UPSERT */
{
assert( ExprUseYTab(pExpr) );
pExpr->y.pTab = pTab;
if( pParse->bReturning ){
eNewExprOp = TK_REGISTER;
pExpr->op2 = TK_COLUMN;
pExpr->iTable = pNC->uNC.iBaseReg + (pTab->nCol+1)*pExpr->iTable +
sqlite3TableColumnToStorage(pTab, iCol) + 1;
}else{
pExpr->iColumn = (i16)iCol;
eNewExprOp = TK_TRIGGER;
#ifndef SQLITE_OMIT_TRIGGER
if( iCol<0 ){
pExpr->affExpr = SQLITE_AFF_INTEGER;
}else if( pExpr->iTable==0 ){
testcase( iCol==31 );
testcase( iCol==32 );
pParse->oldmask |= (iCol>=32 ? 0xffffffff : (((u32)1)<<iCol));
}else{
testcase( iCol==31 );
testcase( iCol==32 );
pParse->newmask |= (iCol>=32 ? 0xffffffff : (((u32)1)<<iCol));
}
#endif /* SQLITE_OMIT_TRIGGER */
}
}
}
}
}
#endif /* !defined(SQLITE_OMIT_TRIGGER) || !defined(SQLITE_OMIT_UPSERT) */
/*
** Perhaps the name is a reference to the ROWID
*/
if( cnt==0
&& cntTab==1
&& pMatch
&& (pNC->ncFlags & (NC_IdxExpr|NC_GenCol))==0
&& sqlite3IsRowid(zCol)
&& ALWAYS(VisibleRowid(pMatch->pTab))
){
cnt = 1;
pExpr->iColumn = -1;
pExpr->affExpr = SQLITE_AFF_INTEGER;
}
/*
** If the input is of the form Z (not Y.Z or X.Y.Z) then the name Z
** might refer to an result-set alias. This happens, for example, when
** we are resolving names in the WHERE clause of the following command:
**
** SELECT a+b AS x FROM table WHERE x<10;
**
** In cases like this, replace pExpr with a copy of the expression that
** forms the result set entry ("a+b" in the example) and return immediately.
** Note that the expression in the result set should have already been
** resolved by the time the WHERE clause is resolved.
**
** The ability to use an output result-set column in the WHERE, GROUP BY,
** or HAVING clauses, or as part of a larger expression in the ORDER BY
** clause is not standard SQL. This is a (goofy) SQLite extension, that
** is supported for backwards compatibility only. Hence, we issue a warning
** on sqlite3_log() whenever the capability is used.
*/
if( cnt==0
&& (pNC->ncFlags & NC_UEList)!=0
&& zTab==0
){
pEList = pNC->uNC.pEList;
assert( pEList!=0 );
for(j=0; j<pEList->nExpr; j++){
char *zAs = pEList->a[j].zEName;
if( pEList->a[j].fg.eEName==ENAME_NAME
&& sqlite3_stricmp(zAs, zCol)==0
){
Expr *pOrig;
assert( pExpr->pLeft==0 && pExpr->pRight==0 );
assert( ExprUseXList(pExpr)==0 || pExpr->x.pList==0 );
assert( ExprUseXSelect(pExpr)==0 || pExpr->x.pSelect==0 );
pOrig = pEList->a[j].pExpr;
if( (pNC->ncFlags&NC_AllowAgg)==0 && ExprHasProperty(pOrig, EP_Agg) ){
sqlite3ErrorMsg(pParse, "misuse of aliased aggregate %s", zAs);
return WRC_Abort;
}
if( ExprHasProperty(pOrig, EP_Win)
&& ((pNC->ncFlags&NC_AllowWin)==0 || pNC!=pTopNC )
){
sqlite3ErrorMsg(pParse, "misuse of aliased window function %s",zAs);
return WRC_Abort;
}
if( sqlite3ExprVectorSize(pOrig)!=1 ){
sqlite3ErrorMsg(pParse, "row value misused");
return WRC_Abort;
}
resolveAlias(pParse, pEList, j, pExpr, nSubquery);
cnt = 1;
pMatch = 0;
assert( zTab==0 && zDb==0 );
if( IN_RENAME_OBJECT ){
sqlite3RenameTokenRemap(pParse, 0, (void*)pExpr);
}
goto lookupname_end;
}
}
}
/* Advance to the next name context. The loop will exit when either
** we have a match (cnt>0) or when we run out of name contexts.
*/
if( cnt ) break;
pNC = pNC->pNext;
nSubquery++;
}while( pNC );
/*
** If X and Y are NULL (in other words if only the column name Z is
** supplied) and the value of Z is enclosed in double-quotes, then
** Z is a string literal if it doesn't match any column names. In that
** case, we need to return right away and not make any changes to
** pExpr.
**
** Because no reference was made to outer contexts, the pNC->nRef
** fields are not changed in any context.
*/
if( cnt==0 && zTab==0 ){
assert( pExpr->op==TK_ID );
if( ExprHasProperty(pExpr,EP_DblQuoted)
&& areDoubleQuotedStringsEnabled(db, pTopNC)
){
/* If a double-quoted identifier does not match any known column name,
** then treat it as a string.
**
** This hack was added in the early days of SQLite in a misguided attempt
** to be compatible with MySQL 3.x, which used double-quotes for strings.
** I now sorely regret putting in this hack. The effect of this hack is
** that misspelled identifier names are silently converted into strings
** rather than causing an error, to the frustration of countless
** programmers. To all those frustrated programmers, my apologies.
**
** Someday, I hope to get rid of this hack. Unfortunately there is
** a huge amount of legacy SQL that uses it. So for now, we just
** issue a warning.
*/
sqlite3_log(SQLITE_WARNING,
"double-quoted string literal: \"%w\"", zCol);
#ifdef SQLITE_ENABLE_NORMALIZE
sqlite3VdbeAddDblquoteStr(db, pParse->pVdbe, zCol);
#endif
pExpr->op = TK_STRING;
memset(&pExpr->y, 0, sizeof(pExpr->y));
return WRC_Prune;
}
if( sqlite3ExprIdToTrueFalse(pExpr) ){
return WRC_Prune;
}
}
/*
** cnt==0 means there was not match.
** cnt>1 means there were two or more matches.
**
** cnt==0 is always an error. cnt>1 is often an error, but might
** be multiple matches for a NATURAL LEFT JOIN or a LEFT JOIN USING.
*/
assert( pFJMatch==0 || cnt>0 );
assert( !ExprHasProperty(pExpr, EP_xIsSelect|EP_IntValue) );
if( cnt!=1 ){
const char *zErr;
if( pFJMatch ){
if( pFJMatch->nExpr==cnt-1 ){
if( ExprHasProperty(pExpr,EP_Leaf) ){
ExprClearProperty(pExpr,EP_Leaf);
}else{
sqlite3ExprDelete(db, pExpr->pLeft);
pExpr->pLeft = 0;
sqlite3ExprDelete(db, pExpr->pRight);
pExpr->pRight = 0;
}
extendFJMatch(pParse, &pFJMatch, pMatch, pExpr->iColumn);
pExpr->op = TK_FUNCTION;
pExpr->u.zToken = "coalesce";
pExpr->x.pList = pFJMatch;
cnt = 1;
goto lookupname_end;
}else{
sqlite3ExprListDelete(db, pFJMatch);
pFJMatch = 0;
}
}
zErr = cnt==0 ? "no such column" : "ambiguous column name";
if( zDb ){
sqlite3ErrorMsg(pParse, "%s: %s.%s.%s", zErr, zDb, zTab, zCol);
}else if( zTab ){
sqlite3ErrorMsg(pParse, "%s: %s.%s", zErr, zTab, zCol);
}else{
sqlite3ErrorMsg(pParse, "%s: %s", zErr, zCol);
}
sqlite3RecordErrorOffsetOfExpr(pParse->db, pExpr);
pParse->checkSchema = 1;
pTopNC->nNcErr++;
}
assert( pFJMatch==0 );
/* Remove all substructure from pExpr */
if( !ExprHasProperty(pExpr,(EP_TokenOnly|EP_Leaf)) ){
sqlite3ExprDelete(db, pExpr->pLeft);
pExpr->pLeft = 0;
sqlite3ExprDelete(db, pExpr->pRight);
pExpr->pRight = 0;
ExprSetProperty(pExpr, EP_Leaf);
}
/* If a column from a table in pSrcList is referenced, then record
** this fact in the pSrcList.a[].colUsed bitmask. Column 0 causes
** bit 0 to be set. Column 1 sets bit 1. And so forth. Bit 63 is
** set if the 63rd or any subsequent column is used.
**
** The colUsed mask is an optimization used to help determine if an
** index is a covering index. The correct answer is still obtained
** if the mask contains extra set bits. However, it is important to
** avoid setting bits beyond the maximum column number of the table.
** (See ticket [b92e5e8ec2cdbaa1]).
**
** If a generated column is referenced, set bits for every column
** of the table.
*/
if( pExpr->iColumn>=0 && pMatch!=0 ){
pMatch->colUsed |= sqlite3ExprColUsed(pExpr);
}
pExpr->op = eNewExprOp;
lookupname_end:
if( cnt==1 ){
assert( pNC!=0 );
#ifndef SQLITE_OMIT_AUTHORIZATION
if( pParse->db->xAuth
&& (pExpr->op==TK_COLUMN || pExpr->op==TK_TRIGGER)
){
sqlite3AuthRead(pParse, pExpr, pSchema, pNC->pSrcList);
}
#endif
/* Increment the nRef value on all name contexts from TopNC up to
** the point where the name matched. */
for(;;){
assert( pTopNC!=0 );
pTopNC->nRef++;
if( pTopNC==pNC ) break;
pTopNC = pTopNC->pNext;
}
return WRC_Prune;
} else {
return WRC_Abort;
}
}
/*
** Allocate and return a pointer to an expression to load the column iCol
** from datasource iSrc in SrcList pSrc.
*/
Expr *sqlite3CreateColumnExpr(sqlite3 *db, SrcList *pSrc, int iSrc, int iCol){
Expr *p = sqlite3ExprAlloc(db, TK_COLUMN, 0, 0);
if( p ){
SrcItem *pItem = &pSrc->a[iSrc];
Table *pTab;
assert( ExprUseYTab(p) );
pTab = p->y.pTab = pItem->pTab;
p->iTable = pItem->iCursor;
if( p->y.pTab->iPKey==iCol ){
p->iColumn = -1;
}else{
p->iColumn = (ynVar)iCol;
if( (pTab->tabFlags & TF_HasGenerated)!=0
&& (pTab->aCol[iCol].colFlags & COLFLAG_GENERATED)!=0
){
testcase( pTab->nCol==63 );
testcase( pTab->nCol==64 );
pItem->colUsed = pTab->nCol>=64 ? ALLBITS : MASKBIT(pTab->nCol)-1;
}else{
testcase( iCol==BMS );
testcase( iCol==BMS-1 );
pItem->colUsed |= ((Bitmask)1)<<(iCol>=BMS ? BMS-1 : iCol);
}
}
}
return p;
}
/*
** Report an error that an expression is not valid for some set of
** pNC->ncFlags values determined by validMask.
**
** static void notValid(
** Parse *pParse, // Leave error message here
** NameContext *pNC, // The name context
** const char *zMsg, // Type of error
** int validMask, // Set of contexts for which prohibited
** Expr *pExpr // Invalidate this expression on error
** ){...}
**
** As an optimization, since the conditional is almost always false
** (because errors are rare), the conditional is moved outside of the
** function call using a macro.
*/
static void notValidImpl(
Parse *pParse, /* Leave error message here */
NameContext *pNC, /* The name context */
const char *zMsg, /* Type of error */
Expr *pExpr, /* Invalidate this expression on error */
Expr *pError /* Associate error with this expression */
){
const char *zIn = "partial index WHERE clauses";
if( pNC->ncFlags & NC_IdxExpr ) zIn = "index expressions";
#ifndef SQLITE_OMIT_CHECK
else if( pNC->ncFlags & NC_IsCheck ) zIn = "CHECK constraints";
#endif
#ifndef SQLITE_OMIT_GENERATED_COLUMNS
else if( pNC->ncFlags & NC_GenCol ) zIn = "generated columns";
#endif
sqlite3ErrorMsg(pParse, "%s prohibited in %s", zMsg, zIn);
if( pExpr ) pExpr->op = TK_NULL;
sqlite3RecordErrorOffsetOfExpr(pParse->db, pError);
}
#define sqlite3ResolveNotValid(P,N,M,X,E,R) \
assert( ((X)&~(NC_IsCheck|NC_PartIdx|NC_IdxExpr|NC_GenCol))==0 ); \
if( ((N)->ncFlags & (X))!=0 ) notValidImpl(P,N,M,E,R);
/*
** Expression p should encode a floating point value between 1.0 and 0.0.
** Return 1024 times this value. Or return -1 if p is not a floating point
** value between 1.0 and 0.0.
*/
static int exprProbability(Expr *p){
double r = -1.0;
if( p->op!=TK_FLOAT ) return -1;
assert( !ExprHasProperty(p, EP_IntValue) );
sqlite3AtoF(p->u.zToken, &r, sqlite3Strlen30(p->u.zToken), SQLITE_UTF8);
assert( r>=0.0 );
if( r>1.0 ) return -1;
return (int)(r*134217728.0);
}
/*
** This routine is callback for sqlite3WalkExpr().
**
** Resolve symbolic names into TK_COLUMN operators for the current
** node in the expression tree. Return 0 to continue the search down
** the tree or 2 to abort the tree walk.
**
** This routine also does error checking and name resolution for
** function names. The operator for aggregate functions is changed
** to TK_AGG_FUNCTION.
*/
static int resolveExprStep(Walker *pWalker, Expr *pExpr){
NameContext *pNC;
Parse *pParse;
pNC = pWalker->u.pNC;
assert( pNC!=0 );
pParse = pNC->pParse;
assert( pParse==pWalker->pParse );
#ifndef NDEBUG
if( pNC->pSrcList && pNC->pSrcList->nAlloc>0 ){
SrcList *pSrcList = pNC->pSrcList;
int i;
for(i=0; i<pNC->pSrcList->nSrc; i++){
assert( pSrcList->a[i].iCursor>=0 && pSrcList->a[i].iCursor<pParse->nTab);
}
}
#endif
switch( pExpr->op ){
/* The special operator TK_ROW means use the rowid for the first
** column in the FROM clause. This is used by the LIMIT and ORDER BY
** clause processing on UPDATE and DELETE statements, and by
** UPDATE ... FROM statement processing.
*/
case TK_ROW: {
SrcList *pSrcList = pNC->pSrcList;
SrcItem *pItem;
assert( pSrcList && pSrcList->nSrc>=1 );
pItem = pSrcList->a;
pExpr->op = TK_COLUMN;
assert( ExprUseYTab(pExpr) );
pExpr->y.pTab = pItem->pTab;
pExpr->iTable = pItem->iCursor;
pExpr->iColumn--;
pExpr->affExpr = SQLITE_AFF_INTEGER;
break;
}
/* An optimization: Attempt to convert
**
** "expr IS NOT NULL" --> "TRUE"
** "expr IS NULL" --> "FALSE"
**
** if we can prove that "expr" is never NULL. Call this the
** "NOT NULL strength reduction optimization".
**
** If this optimization occurs, also restore the NameContext ref-counts
** to the state they where in before the "column" LHS expression was
** resolved. This prevents "column" from being counted as having been
** referenced, which might prevent a SELECT from being erroneously
** marked as correlated.
*/
case TK_NOTNULL:
case TK_ISNULL: {
int anRef[8];
NameContext *p;
int i;
for(i=0, p=pNC; p && i<ArraySize(anRef); p=p->pNext, i++){
anRef[i] = p->nRef;
}
sqlite3WalkExpr(pWalker, pExpr->pLeft);
if( 0==sqlite3ExprCanBeNull(pExpr->pLeft) && !IN_RENAME_OBJECT ){
testcase( ExprHasProperty(pExpr, EP_OuterON) );
assert( !ExprHasProperty(pExpr, EP_IntValue) );
if( pExpr->op==TK_NOTNULL ){
pExpr->u.zToken = "true";
ExprSetProperty(pExpr, EP_IsTrue);
}else{
pExpr->u.zToken = "false";
ExprSetProperty(pExpr, EP_IsFalse);
}
pExpr->op = TK_TRUEFALSE;
for(i=0, p=pNC; p && i<ArraySize(anRef); p=p->pNext, i++){
p->nRef = anRef[i];
}
sqlite3ExprDelete(pParse->db, pExpr->pLeft);
pExpr->pLeft = 0;
}
return WRC_Prune;
}
/* A column name: ID
** Or table name and column name: ID.ID
** Or a database, table and column: ID.ID.ID
**
** The TK_ID and TK_OUT cases are combined so that there will only
** be one call to lookupName(). Then the compiler will in-line
** lookupName() for a size reduction and performance increase.
*/
case TK_ID:
case TK_DOT: {
const char *zColumn;
const char *zTable;
const char *zDb;
Expr *pRight;
if( pExpr->op==TK_ID ){
zDb = 0;
zTable = 0;
assert( !ExprHasProperty(pExpr, EP_IntValue) );
zColumn = pExpr->u.zToken;
}else{
Expr *pLeft = pExpr->pLeft;
testcase( pNC->ncFlags & NC_IdxExpr );
testcase( pNC->ncFlags & NC_GenCol );
sqlite3ResolveNotValid(pParse, pNC, "the \".\" operator",
NC_IdxExpr|NC_GenCol, 0, pExpr);
pRight = pExpr->pRight;
if( pRight->op==TK_ID ){
zDb = 0;
}else{
assert( pRight->op==TK_DOT );
assert( !ExprHasProperty(pRight, EP_IntValue) );
zDb = pLeft->u.zToken;
pLeft = pRight->pLeft;
pRight = pRight->pRight;
}
assert( ExprUseUToken(pLeft) && ExprUseUToken(pRight) );
zTable = pLeft->u.zToken;
zColumn = pRight->u.zToken;
assert( ExprUseYTab(pExpr) );
if( IN_RENAME_OBJECT ){
sqlite3RenameTokenRemap(pParse, (void*)pExpr, (void*)pRight);
sqlite3RenameTokenRemap(pParse, (void*)&pExpr->y.pTab, (void*)pLeft);
}
}
return lookupName(pParse, zDb, zTable, zColumn, pNC, pExpr);
}
/* Resolve function names
*/
case TK_FUNCTION: {
ExprList *pList = pExpr->x.pList; /* The argument list */
int n = pList ? pList->nExpr : 0; /* Number of arguments */
int no_such_func = 0; /* True if no such function exists */
int wrong_num_args = 0; /* True if wrong number of arguments */
int is_agg = 0; /* True if is an aggregate function */
const char *zId; /* The function name. */
FuncDef *pDef; /* Information about the function */
u8 enc = ENC(pParse->db); /* The database encoding */
int savedAllowFlags = (pNC->ncFlags & (NC_AllowAgg | NC_AllowWin));
#ifndef SQLITE_OMIT_WINDOWFUNC
Window *pWin = (IsWindowFunc(pExpr) ? pExpr->y.pWin : 0);
#endif
assert( !ExprHasProperty(pExpr, EP_xIsSelect|EP_IntValue) );
zId = pExpr->u.zToken;
pDef = sqlite3FindFunction(pParse->db, zId, n, enc, 0);
if( pDef==0 ){
pDef = sqlite3FindFunction(pParse->db, zId, -2, enc, 0);
if( pDef==0 ){
no_such_func = 1;
}else{
wrong_num_args = 1;
}
}else{
is_agg = pDef->xFinalize!=0;
if( pDef->funcFlags & SQLITE_FUNC_UNLIKELY ){
ExprSetProperty(pExpr, EP_Unlikely);
if( n==2 ){
pExpr->iTable = exprProbability(pList->a[1].pExpr);
if( pExpr->iTable<0 ){
sqlite3ErrorMsg(pParse,
"second argument to %#T() must be a "
"constant between 0.0 and 1.0", pExpr);
pNC->nNcErr++;
}
}else{
/* EVIDENCE-OF: R-61304-29449 The unlikely(X) function is
** equivalent to likelihood(X, 0.0625).
** EVIDENCE-OF: R-01283-11636 The unlikely(X) function is
** short-hand for likelihood(X,0.0625).
** EVIDENCE-OF: R-36850-34127 The likely(X) function is short-hand
** for likelihood(X,0.9375).
** EVIDENCE-OF: R-53436-40973 The likely(X) function is equivalent
** to likelihood(X,0.9375). */
/* TUNING: unlikely() probability is 0.0625. likely() is 0.9375 */
pExpr->iTable = pDef->zName[0]=='u' ? 8388608 : 125829120;
}
}
#ifndef SQLITE_OMIT_AUTHORIZATION
{
int auth = sqlite3AuthCheck(pParse, SQLITE_FUNCTION, 0,pDef->zName,0);
if( auth!=SQLITE_OK ){
if( auth==SQLITE_DENY ){
sqlite3ErrorMsg(pParse, "not authorized to use function: %#T",
pExpr);
pNC->nNcErr++;
}
pExpr->op = TK_NULL;
return WRC_Prune;
}
}
#endif
if( pDef->funcFlags & (SQLITE_FUNC_CONSTANT|SQLITE_FUNC_SLOCHNG) ){
/* For the purposes of the EP_ConstFunc flag, date and time
** functions and other functions that change slowly are considered
** constant because they are constant for the duration of one query.
** This allows them to be factored out of inner loops. */
ExprSetProperty(pExpr,EP_ConstFunc);
}
if( (pDef->funcFlags & SQLITE_FUNC_CONSTANT)==0 ){
/* Clearly non-deterministic functions like random(), but also
** date/time functions that use 'now', and other functions like
** sqlite_version() that might change over time cannot be used
** in an index or generated column. Curiously, they can be used
** in a CHECK constraint. SQLServer, MySQL, and PostgreSQL all
** all this. */
sqlite3ResolveNotValid(pParse, pNC, "non-deterministic functions",
NC_IdxExpr|NC_PartIdx|NC_GenCol, 0, pExpr);
}else{
assert( (NC_SelfRef & 0xff)==NC_SelfRef ); /* Must fit in 8 bits */
pExpr->op2 = pNC->ncFlags & NC_SelfRef;
if( pNC->ncFlags & NC_FromDDL ) ExprSetProperty(pExpr, EP_FromDDL);
}
if( (pDef->funcFlags & SQLITE_FUNC_INTERNAL)!=0
&& pParse->nested==0
&& (pParse->db->mDbFlags & DBFLAG_InternalFunc)==0
){
/* Internal-use-only functions are disallowed unless the
** SQL is being compiled using sqlite3NestedParse() or
** the SQLITE_TESTCTRL_INTERNAL_FUNCTIONS test-control has be
** used to activate internal functions for testing purposes */
no_such_func = 1;
pDef = 0;
}else
if( (pDef->funcFlags & (SQLITE_FUNC_DIRECT|SQLITE_FUNC_UNSAFE))!=0
&& !IN_RENAME_OBJECT
){
sqlite3ExprFunctionUsable(pParse, pExpr, pDef);
}
}
if( 0==IN_RENAME_OBJECT ){
#ifndef SQLITE_OMIT_WINDOWFUNC
assert( is_agg==0 || (pDef->funcFlags & SQLITE_FUNC_MINMAX)
|| (pDef->xValue==0 && pDef->xInverse==0)
|| (pDef->xValue && pDef->xInverse && pDef->xSFunc && pDef->xFinalize)
);
if( pDef && pDef->xValue==0 && pWin ){
sqlite3ErrorMsg(pParse,
"%#T() may not be used as a window function", pExpr
);
pNC->nNcErr++;
}else if(
(is_agg && (pNC->ncFlags & NC_AllowAgg)==0)
|| (is_agg && (pDef->funcFlags&SQLITE_FUNC_WINDOW) && !pWin)
|| (is_agg && pWin && (pNC->ncFlags & NC_AllowWin)==0)
){
const char *zType;
if( (pDef->funcFlags & SQLITE_FUNC_WINDOW) || pWin ){
zType = "window";
}else{
zType = "aggregate";
}
sqlite3ErrorMsg(pParse, "misuse of %s function %#T()",zType,pExpr);
pNC->nNcErr++;
is_agg = 0;
}
#else
if( (is_agg && (pNC->ncFlags & NC_AllowAgg)==0) ){
sqlite3ErrorMsg(pParse,"misuse of aggregate function %#T()",pExpr);
pNC->nNcErr++;
is_agg = 0;
}
#endif
else if( no_such_func && pParse->db->init.busy==0
#ifdef SQLITE_ENABLE_UNKNOWN_SQL_FUNCTION
&& pParse->explain==0
#endif
){
sqlite3ErrorMsg(pParse, "no such function: %#T", pExpr);
pNC->nNcErr++;
}else if( wrong_num_args ){
sqlite3ErrorMsg(pParse,"wrong number of arguments to function %#T()",
pExpr);
pNC->nNcErr++;
}
#ifndef SQLITE_OMIT_WINDOWFUNC
else if( is_agg==0 && ExprHasProperty(pExpr, EP_WinFunc) ){
sqlite3ErrorMsg(pParse,
"FILTER may not be used with non-aggregate %#T()",
pExpr
);
pNC->nNcErr++;
}
#endif
if( is_agg ){
/* Window functions may not be arguments of aggregate functions.
** Or arguments of other window functions. But aggregate functions
** may be arguments for window functions. */
#ifndef SQLITE_OMIT_WINDOWFUNC
pNC->ncFlags &= ~(NC_AllowWin | (!pWin ? NC_AllowAgg : 0));
#else
pNC->ncFlags &= ~NC_AllowAgg;
#endif
}
}
#ifndef SQLITE_OMIT_WINDOWFUNC
else if( ExprHasProperty(pExpr, EP_WinFunc) ){
is_agg = 1;
}
#endif
sqlite3WalkExprList(pWalker, pList);
if( is_agg ){
#ifndef SQLITE_OMIT_WINDOWFUNC
if( pWin ){
Select *pSel = pNC->pWinSelect;
assert( pWin==0 || (ExprUseYWin(pExpr) && pWin==pExpr->y.pWin) );
if( IN_RENAME_OBJECT==0 ){
sqlite3WindowUpdate(pParse, pSel ? pSel->pWinDefn : 0, pWin, pDef);
if( pParse->db->mallocFailed ) break;
}
sqlite3WalkExprList(pWalker, pWin->pPartition);
sqlite3WalkExprList(pWalker, pWin->pOrderBy);
sqlite3WalkExpr(pWalker, pWin->pFilter);
sqlite3WindowLink(pSel, pWin);
pNC->ncFlags |= NC_HasWin;
}else
#endif /* SQLITE_OMIT_WINDOWFUNC */
{
NameContext *pNC2; /* For looping up thru outer contexts */
pExpr->op = TK_AGG_FUNCTION;
pExpr->op2 = 0;
#ifndef SQLITE_OMIT_WINDOWFUNC
if( ExprHasProperty(pExpr, EP_WinFunc) ){
sqlite3WalkExpr(pWalker, pExpr->y.pWin->pFilter);
}
#endif
pNC2 = pNC;
while( pNC2
&& sqlite3ReferencesSrcList(pParse, pExpr, pNC2->pSrcList)==0
){
pExpr->op2++;
pNC2 = pNC2->pNext;
}
assert( pDef!=0 || IN_RENAME_OBJECT );
if( pNC2 && pDef ){
assert( SQLITE_FUNC_MINMAX==NC_MinMaxAgg );
assert( SQLITE_FUNC_ANYORDER==NC_OrderAgg );
testcase( (pDef->funcFlags & SQLITE_FUNC_MINMAX)!=0 );
testcase( (pDef->funcFlags & SQLITE_FUNC_ANYORDER)!=0 );
pNC2->ncFlags |= NC_HasAgg
| ((pDef->funcFlags^SQLITE_FUNC_ANYORDER)
& (SQLITE_FUNC_MINMAX|SQLITE_FUNC_ANYORDER));
}
}
pNC->ncFlags |= savedAllowFlags;
}
/* FIX ME: Compute pExpr->affinity based on the expected return
** type of the function
*/
return WRC_Prune;
}
#ifndef SQLITE_OMIT_SUBQUERY
case TK_SELECT:
case TK_EXISTS: testcase( pExpr->op==TK_EXISTS );
#endif
case TK_IN: {
testcase( pExpr->op==TK_IN );
if( ExprUseXSelect(pExpr) ){
int nRef = pNC->nRef;
testcase( pNC->ncFlags & NC_IsCheck );
testcase( pNC->ncFlags & NC_PartIdx );
testcase( pNC->ncFlags & NC_IdxExpr );
testcase( pNC->ncFlags & NC_GenCol );
if( pNC->ncFlags & NC_SelfRef ){
notValidImpl(pParse, pNC, "subqueries", pExpr, pExpr);
}else{
sqlite3WalkSelect(pWalker, pExpr->x.pSelect);
}
assert( pNC->nRef>=nRef );
if( nRef!=pNC->nRef ){
ExprSetProperty(pExpr, EP_VarSelect);
pNC->ncFlags |= NC_VarSelect;
}
}
break;
}
case TK_VARIABLE: {
testcase( pNC->ncFlags & NC_IsCheck );
testcase( pNC->ncFlags & NC_PartIdx );
testcase( pNC->ncFlags & NC_IdxExpr );
testcase( pNC->ncFlags & NC_GenCol );
sqlite3ResolveNotValid(pParse, pNC, "parameters",
NC_IsCheck|NC_PartIdx|NC_IdxExpr|NC_GenCol, pExpr, pExpr);
break;
}
case TK_IS:
case TK_ISNOT: {
Expr *pRight = sqlite3ExprSkipCollateAndLikely(pExpr->pRight);
assert( !ExprHasProperty(pExpr, EP_Reduced) );
/* Handle special cases of "x IS TRUE", "x IS FALSE", "x IS NOT TRUE",
** and "x IS NOT FALSE". */
if( ALWAYS(pRight) && (pRight->op==TK_ID || pRight->op==TK_TRUEFALSE) ){
int rc = resolveExprStep(pWalker, pRight);
if( rc==WRC_Abort ) return WRC_Abort;
if( pRight->op==TK_TRUEFALSE ){
pExpr->op2 = pExpr->op;
pExpr->op = TK_TRUTH;
return WRC_Continue;
}
}
/* no break */ deliberate_fall_through
}
case TK_BETWEEN:
case TK_EQ:
case TK_NE:
case TK_LT:
case TK_LE:
case TK_GT:
case TK_GE: {
int nLeft, nRight;
if( pParse->db->mallocFailed ) break;
assert( pExpr->pLeft!=0 );
nLeft = sqlite3ExprVectorSize(pExpr->pLeft);
if( pExpr->op==TK_BETWEEN ){
assert( ExprUseXList(pExpr) );
nRight = sqlite3ExprVectorSize(pExpr->x.pList->a[0].pExpr);
if( nRight==nLeft ){
nRight = sqlite3ExprVectorSize(pExpr->x.pList->a[1].pExpr);
}
}else{
assert( pExpr->pRight!=0 );
nRight = sqlite3ExprVectorSize(pExpr->pRight);
}
if( nLeft!=nRight ){
testcase( pExpr->op==TK_EQ );
testcase( pExpr->op==TK_NE );
testcase( pExpr->op==TK_LT );
testcase( pExpr->op==TK_LE );
testcase( pExpr->op==TK_GT );
testcase( pExpr->op==TK_GE );
testcase( pExpr->op==TK_IS );
testcase( pExpr->op==TK_ISNOT );
testcase( pExpr->op==TK_BETWEEN );
sqlite3ErrorMsg(pParse, "row value misused");
sqlite3RecordErrorOffsetOfExpr(pParse->db, pExpr);
}
break;
}
}
assert( pParse->db->mallocFailed==0 || pParse->nErr!=0 );
return pParse->nErr ? WRC_Abort : WRC_Continue;
}
/*
** pEList is a list of expressions which are really the result set of the
** a SELECT statement. pE is a term in an ORDER BY or GROUP BY clause.
** This routine checks to see if pE is a simple identifier which corresponds
** to the AS-name of one of the terms of the expression list. If it is,
** this routine return an integer between 1 and N where N is the number of
** elements in pEList, corresponding to the matching entry. If there is
** no match, or if pE is not a simple identifier, then this routine
** return 0.
**
** pEList has been resolved. pE has not.
*/
static int resolveAsName(
Parse *pParse, /* Parsing context for error messages */
ExprList *pEList, /* List of expressions to scan */
Expr *pE /* Expression we are trying to match */
){
int i; /* Loop counter */
UNUSED_PARAMETER(pParse);
if( pE->op==TK_ID ){
const char *zCol;
assert( !ExprHasProperty(pE, EP_IntValue) );
zCol = pE->u.zToken;
for(i=0; i<pEList->nExpr; i++){
if( pEList->a[i].fg.eEName==ENAME_NAME
&& sqlite3_stricmp(pEList->a[i].zEName, zCol)==0
){
return i+1;
}
}
}
return 0;
}
/*
** pE is a pointer to an expression which is a single term in the
** ORDER BY of a compound SELECT. The expression has not been
** name resolved.
**
** At the point this routine is called, we already know that the
** ORDER BY term is not an integer index into the result set. That
** case is handled by the calling routine.
**
** Attempt to match pE against result set columns in the left-most
** SELECT statement. Return the index i of the matching column,
** as an indication to the caller that it should sort by the i-th column.
** The left-most column is 1. In other words, the value returned is the
** same integer value that would be used in the SQL statement to indicate
** the column.
**
** If there is no match, return 0. Return -1 if an error occurs.
*/
static int resolveOrderByTermToExprList(
Parse *pParse, /* Parsing context for error messages */
Select *pSelect, /* The SELECT statement with the ORDER BY clause */
Expr *pE /* The specific ORDER BY term */
){
int i; /* Loop counter */
ExprList *pEList; /* The columns of the result set */
NameContext nc; /* Name context for resolving pE */
sqlite3 *db; /* Database connection */
int rc; /* Return code from subprocedures */
u8 savedSuppErr; /* Saved value of db->suppressErr */
assert( sqlite3ExprIsInteger(pE, &i)==0 );
pEList = pSelect->pEList;
/* Resolve all names in the ORDER BY term expression
*/
memset(&nc, 0, sizeof(nc));
nc.pParse = pParse;
nc.pSrcList = pSelect->pSrc;
nc.uNC.pEList = pEList;
nc.ncFlags = NC_AllowAgg|NC_UEList|NC_NoSelect;
nc.nNcErr = 0;
db = pParse->db;
savedSuppErr = db->suppressErr;
db->suppressErr = 1;
rc = sqlite3ResolveExprNames(&nc, pE);
db->suppressErr = savedSuppErr;
if( rc ) return 0;
/* Try to match the ORDER BY expression against an expression
** in the result set. Return an 1-based index of the matching
** result-set entry.
*/
for(i=0; i<pEList->nExpr; i++){
if( sqlite3ExprCompare(0, pEList->a[i].pExpr, pE, -1)<2 ){
return i+1;
}
}
/* If no match, return 0. */
return 0;
}
/*
** Generate an ORDER BY or GROUP BY term out-of-range error.
*/
static void resolveOutOfRangeError(
Parse *pParse, /* The error context into which to write the error */
const char *zType, /* "ORDER" or "GROUP" */
int i, /* The index (1-based) of the term out of range */
int mx, /* Largest permissible value of i */
Expr *pError /* Associate the error with the expression */
){
sqlite3ErrorMsg(pParse,
"%r %s BY term out of range - should be "
"between 1 and %d", i, zType, mx);
sqlite3RecordErrorOffsetOfExpr(pParse->db, pError);
}
/*
** Analyze the ORDER BY clause in a compound SELECT statement. Modify
** each term of the ORDER BY clause is a constant integer between 1
** and N where N is the number of columns in the compound SELECT.
**
** ORDER BY terms that are already an integer between 1 and N are
** unmodified. ORDER BY terms that are integers outside the range of
** 1 through N generate an error. ORDER BY terms that are expressions
** are matched against result set expressions of compound SELECT
** beginning with the left-most SELECT and working toward the right.
** At the first match, the ORDER BY expression is transformed into
** the integer column number.
**
** Return the number of errors seen.
*/
static int resolveCompoundOrderBy(
Parse *pParse, /* Parsing context. Leave error messages here */
Select *pSelect /* The SELECT statement containing the ORDER BY */
){
int i;
ExprList *pOrderBy;
ExprList *pEList;
sqlite3 *db;
int moreToDo = 1;
pOrderBy = pSelect->pOrderBy;
if( pOrderBy==0 ) return 0;
db = pParse->db;
if( pOrderBy->nExpr>db->aLimit[SQLITE_LIMIT_COLUMN] ){
sqlite3ErrorMsg(pParse, "too many terms in ORDER BY clause");
return 1;
}
for(i=0; i<pOrderBy->nExpr; i++){
pOrderBy->a[i].fg.done = 0;
}
pSelect->pNext = 0;
while( pSelect->pPrior ){
pSelect->pPrior->pNext = pSelect;
pSelect = pSelect->pPrior;
}
while( pSelect && moreToDo ){
struct ExprList_item *pItem;
moreToDo = 0;
pEList = pSelect->pEList;
assert( pEList!=0 );
for(i=0, pItem=pOrderBy->a; i<pOrderBy->nExpr; i++, pItem++){
int iCol = -1;
Expr *pE, *pDup;
if( pItem->fg.done ) continue;
pE = sqlite3ExprSkipCollateAndLikely(pItem->pExpr);
if( NEVER(pE==0) ) continue;
if( sqlite3ExprIsInteger(pE, &iCol) ){
if( iCol<=0 || iCol>pEList->nExpr ){
resolveOutOfRangeError(pParse, "ORDER", i+1, pEList->nExpr, pE);
return 1;
}
}else{
iCol = resolveAsName(pParse, pEList, pE);
if( iCol==0 ){
/* Now test if expression pE matches one of the values returned
** by pSelect. In the usual case this is done by duplicating the
** expression, resolving any symbols in it, and then comparing
** it against each expression returned by the SELECT statement.
** Once the comparisons are finished, the duplicate expression
** is deleted.
**
** If this is running as part of an ALTER TABLE operation and
** the symbols resolve successfully, also resolve the symbols in the
** actual expression. This allows the code in alter.c to modify
** column references within the ORDER BY expression as required. */
pDup = sqlite3ExprDup(db, pE, 0);
if( !db->mallocFailed ){
assert(pDup);
iCol = resolveOrderByTermToExprList(pParse, pSelect, pDup);
if( IN_RENAME_OBJECT && iCol>0 ){
resolveOrderByTermToExprList(pParse, pSelect, pE);
}
}
sqlite3ExprDelete(db, pDup);
}
}
if( iCol>0 ){
/* Convert the ORDER BY term into an integer column number iCol,
** taking care to preserve the COLLATE clause if it exists. */
if( !IN_RENAME_OBJECT ){
Expr *pNew = sqlite3Expr(db, TK_INTEGER, 0);
if( pNew==0 ) return 1;
pNew->flags |= EP_IntValue;
pNew->u.iValue = iCol;
if( pItem->pExpr==pE ){
pItem->pExpr = pNew;
}else{
Expr *pParent = pItem->pExpr;
assert( pParent->op==TK_COLLATE );
while( pParent->pLeft->op==TK_COLLATE ) pParent = pParent->pLeft;
assert( pParent->pLeft==pE );
pParent->pLeft = pNew;
}
sqlite3ExprDelete(db, pE);
pItem->u.x.iOrderByCol = (u16)iCol;
}
pItem->fg.done = 1;
}else{
moreToDo = 1;
}
}
pSelect = pSelect->pNext;
}
for(i=0; i<pOrderBy->nExpr; i++){
if( pOrderBy->a[i].fg.done==0 ){
sqlite3ErrorMsg(pParse, "%r ORDER BY term does not match any "
"column in the result set", i+1);
return 1;
}
}
return 0;
}
/*
** Check every term in the ORDER BY or GROUP BY clause pOrderBy of
** the SELECT statement pSelect. If any term is reference to a
** result set expression (as determined by the ExprList.a.u.x.iOrderByCol
** field) then convert that term into a copy of the corresponding result set
** column.
**
** If any errors are detected, add an error message to pParse and
** return non-zero. Return zero if no errors are seen.
*/
int sqlite3ResolveOrderGroupBy(
Parse *pParse, /* Parsing context. Leave error messages here */
Select *pSelect, /* The SELECT statement containing the clause */
ExprList *pOrderBy, /* The ORDER BY or GROUP BY clause to be processed */
const char *zType /* "ORDER" or "GROUP" */
){
int i;
sqlite3 *db = pParse->db;
ExprList *pEList;
struct ExprList_item *pItem;
if( pOrderBy==0 || pParse->db->mallocFailed || IN_RENAME_OBJECT ) return 0;
if( pOrderBy->nExpr>db->aLimit[SQLITE_LIMIT_COLUMN] ){
sqlite3ErrorMsg(pParse, "too many terms in %s BY clause", zType);
return 1;
}
pEList = pSelect->pEList;
assert( pEList!=0 ); /* sqlite3SelectNew() guarantees this */
for(i=0, pItem=pOrderBy->a; i<pOrderBy->nExpr; i++, pItem++){
if( pItem->u.x.iOrderByCol ){
if( pItem->u.x.iOrderByCol>pEList->nExpr ){
resolveOutOfRangeError(pParse, zType, i+1, pEList->nExpr, 0);
return 1;
}
resolveAlias(pParse, pEList, pItem->u.x.iOrderByCol-1, pItem->pExpr,0);
}
}
return 0;
}
#ifndef SQLITE_OMIT_WINDOWFUNC
/*
** Walker callback for windowRemoveExprFromSelect().
*/
static int resolveRemoveWindowsCb(Walker *pWalker, Expr *pExpr){
UNUSED_PARAMETER(pWalker);
if( ExprHasProperty(pExpr, EP_WinFunc) ){
Window *pWin = pExpr->y.pWin;
sqlite3WindowUnlinkFromSelect(pWin);
}
return WRC_Continue;
}
/*
** Remove any Window objects owned by the expression pExpr from the
** Select.pWin list of Select object pSelect.
*/
static void windowRemoveExprFromSelect(Select *pSelect, Expr *pExpr){
if( pSelect->pWin ){
Walker sWalker;
memset(&sWalker, 0, sizeof(Walker));
sWalker.xExprCallback = resolveRemoveWindowsCb;
sWalker.u.pSelect = pSelect;
sqlite3WalkExpr(&sWalker, pExpr);
}
}
#else
# define windowRemoveExprFromSelect(a, b)
#endif /* SQLITE_OMIT_WINDOWFUNC */
/*
** pOrderBy is an ORDER BY or GROUP BY clause in SELECT statement pSelect.
** The Name context of the SELECT statement is pNC. zType is either
** "ORDER" or "GROUP" depending on which type of clause pOrderBy is.
**
** This routine resolves each term of the clause into an expression.
** If the order-by term is an integer I between 1 and N (where N is the
** number of columns in the result set of the SELECT) then the expression
** in the resolution is a copy of the I-th result-set expression. If
** the order-by term is an identifier that corresponds to the AS-name of
** a result-set expression, then the term resolves to a copy of the
** result-set expression. Otherwise, the expression is resolved in
** the usual way - using sqlite3ResolveExprNames().
**
** This routine returns the number of errors. If errors occur, then
** an appropriate error message might be left in pParse. (OOM errors
** excepted.)
*/
static int resolveOrderGroupBy(
NameContext *pNC, /* The name context of the SELECT statement */
Select *pSelect, /* The SELECT statement holding pOrderBy */
ExprList *pOrderBy, /* An ORDER BY or GROUP BY clause to resolve */
const char *zType /* Either "ORDER" or "GROUP", as appropriate */
){
int i, j; /* Loop counters */
int iCol; /* Column number */
struct ExprList_item *pItem; /* A term of the ORDER BY clause */
Parse *pParse; /* Parsing context */
int nResult; /* Number of terms in the result set */
assert( pOrderBy!=0 );
nResult = pSelect->pEList->nExpr;
pParse = pNC->pParse;
for(i=0, pItem=pOrderBy->a; i<pOrderBy->nExpr; i++, pItem++){
Expr *pE = pItem->pExpr;
Expr *pE2 = sqlite3ExprSkipCollateAndLikely(pE);
if( NEVER(pE2==0) ) continue;
if( zType[0]!='G' ){
iCol = resolveAsName(pParse, pSelect->pEList, pE2);
if( iCol>0 ){
/* If an AS-name match is found, mark this ORDER BY column as being
** a copy of the iCol-th result-set column. The subsequent call to
** sqlite3ResolveOrderGroupBy() will convert the expression to a
** copy of the iCol-th result-set expression. */
pItem->u.x.iOrderByCol = (u16)iCol;
continue;
}
}
if( sqlite3ExprIsInteger(pE2, &iCol) ){
/* The ORDER BY term is an integer constant. Again, set the column
** number so that sqlite3ResolveOrderGroupBy() will convert the
** order-by term to a copy of the result-set expression */
if( iCol<1 || iCol>0xffff ){
resolveOutOfRangeError(pParse, zType, i+1, nResult, pE2);
return 1;
}
pItem->u.x.iOrderByCol = (u16)iCol;
continue;
}
/* Otherwise, treat the ORDER BY term as an ordinary expression */
pItem->u.x.iOrderByCol = 0;
if( sqlite3ResolveExprNames(pNC, pE) ){
return 1;
}
for(j=0; j<pSelect->pEList->nExpr; j++){
if( sqlite3ExprCompare(0, pE, pSelect->pEList->a[j].pExpr, -1)==0 ){
/* Since this expresion is being changed into a reference
** to an identical expression in the result set, remove all Window
** objects belonging to the expression from the Select.pWin list. */
windowRemoveExprFromSelect(pSelect, pE);
pItem->u.x.iOrderByCol = j+1;
}
}
}
return sqlite3ResolveOrderGroupBy(pParse, pSelect, pOrderBy, zType);
}
/*
** Resolve names in the SELECT statement p and all of its descendants.
*/
static int resolveSelectStep(Walker *pWalker, Select *p){
NameContext *pOuterNC; /* Context that contains this SELECT */
NameContext sNC; /* Name context of this SELECT */
int isCompound; /* True if p is a compound select */
int nCompound; /* Number of compound terms processed so far */
Parse *pParse; /* Parsing context */
int i; /* Loop counter */
ExprList *pGroupBy; /* The GROUP BY clause */
Select *pLeftmost; /* Left-most of SELECT of a compound */
sqlite3 *db; /* Database connection */
assert( p!=0 );
if( p->selFlags & SF_Resolved ){
return WRC_Prune;
}
pOuterNC = pWalker->u.pNC;
pParse = pWalker->pParse;
db = pParse->db;
/* Normally sqlite3SelectExpand() will be called first and will have
** already expanded this SELECT. However, if this is a subquery within
** an expression, sqlite3ResolveExprNames() will be called without a
** prior call to sqlite3SelectExpand(). When that happens, let
** sqlite3SelectPrep() do all of the processing for this SELECT.
** sqlite3SelectPrep() will invoke both sqlite3SelectExpand() and
** this routine in the correct order.
*/
if( (p->selFlags & SF_Expanded)==0 ){
sqlite3SelectPrep(pParse, p, pOuterNC);
return pParse->nErr ? WRC_Abort : WRC_Prune;
}
isCompound = p->pPrior!=0;
nCompound = 0;
pLeftmost = p;
while( p ){
assert( (p->selFlags & SF_Expanded)!=0 );
assert( (p->selFlags & SF_Resolved)==0 );
assert( db->suppressErr==0 ); /* SF_Resolved not set if errors suppressed */
p->selFlags |= SF_Resolved;
/* Resolve the expressions in the LIMIT and OFFSET clauses. These
** are not allowed to refer to any names, so pass an empty NameContext.
*/
memset(&sNC, 0, sizeof(sNC));
sNC.pParse = pParse;
sNC.pWinSelect = p;
if( sqlite3ResolveExprNames(&sNC, p->pLimit) ){
return WRC_Abort;
}
/* If the SF_Converted flags is set, then this Select object was
** was created by the convertCompoundSelectToSubquery() function.
** In this case the ORDER BY clause (p->pOrderBy) should be resolved
** as if it were part of the sub-query, not the parent. This block
** moves the pOrderBy down to the sub-query. It will be moved back
** after the names have been resolved. */
if( p->selFlags & SF_Converted ){
Select *pSub = p->pSrc->a[0].pSelect;
assert( p->pSrc->nSrc==1 && p->pOrderBy );
assert( pSub->pPrior && pSub->pOrderBy==0 );
pSub->pOrderBy = p->pOrderBy;
p->pOrderBy = 0;
}
/* Recursively resolve names in all subqueries in the FROM clause
*/
for(i=0; i<p->pSrc->nSrc; i++){
SrcItem *pItem = &p->pSrc->a[i];
if( pItem->pSelect && (pItem->pSelect->selFlags & SF_Resolved)==0 ){
int nRef = pOuterNC ? pOuterNC->nRef : 0;
const char *zSavedContext = pParse->zAuthContext;
if( pItem->zName ) pParse->zAuthContext = pItem->zName;
sqlite3ResolveSelectNames(pParse, pItem->pSelect, pOuterNC);
pParse->zAuthContext = zSavedContext;
if( pParse->nErr ) return WRC_Abort;
assert( db->mallocFailed==0 );
/* If the number of references to the outer context changed when
** expressions in the sub-select were resolved, the sub-select
** is correlated. It is not required to check the refcount on any
** but the innermost outer context object, as lookupName() increments
** the refcount on all contexts between the current one and the
** context containing the column when it resolves a name. */
if( pOuterNC ){
assert( pItem->fg.isCorrelated==0 && pOuterNC->nRef>=nRef );
pItem->fg.isCorrelated = (pOuterNC->nRef>nRef);
}
}
}
/* Set up the local name-context to pass to sqlite3ResolveExprNames() to
** resolve the result-set expression list.
*/
sNC.ncFlags = NC_AllowAgg|NC_AllowWin;
sNC.pSrcList = p->pSrc;
sNC.pNext = pOuterNC;
/* Resolve names in the result set. */
if( sqlite3ResolveExprListNames(&sNC, p->pEList) ) return WRC_Abort;
sNC.ncFlags &= ~NC_AllowWin;
/* If there are no aggregate functions in the result-set, and no GROUP BY
** expression, do not allow aggregates in any of the other expressions.
*/
assert( (p->selFlags & SF_Aggregate)==0 );
pGroupBy = p->pGroupBy;
if( pGroupBy || (sNC.ncFlags & NC_HasAgg)!=0 ){
assert( NC_MinMaxAgg==SF_MinMaxAgg );
assert( NC_OrderAgg==SF_OrderByReqd );
p->selFlags |= SF_Aggregate | (sNC.ncFlags&(NC_MinMaxAgg|NC_OrderAgg));
}else{
sNC.ncFlags &= ~NC_AllowAgg;
}
/* Add the output column list to the name-context before parsing the
** other expressions in the SELECT statement. This is so that
** expressions in the WHERE clause (etc.) can refer to expressions by
** aliases in the result set.
**
** Minor point: If this is the case, then the expression will be
** re-evaluated for each reference to it.
*/
assert( (sNC.ncFlags & (NC_UAggInfo|NC_UUpsert|NC_UBaseReg))==0 );
sNC.uNC.pEList = p->pEList;
sNC.ncFlags |= NC_UEList;
if( p->pHaving ){
if( (p->selFlags & SF_Aggregate)==0 ){
sqlite3ErrorMsg(pParse, "HAVING clause on a non-aggregate query");
return WRC_Abort;
}
if( sqlite3ResolveExprNames(&sNC, p->pHaving) ) return WRC_Abort;
}
if( sqlite3ResolveExprNames(&sNC, p->pWhere) ) return WRC_Abort;
/* Resolve names in table-valued-function arguments */
for(i=0; i<p->pSrc->nSrc; i++){
SrcItem *pItem = &p->pSrc->a[i];
if( pItem->fg.isTabFunc
&& sqlite3ResolveExprListNames(&sNC, pItem->u1.pFuncArg)
){
return WRC_Abort;
}
}
#ifndef SQLITE_OMIT_WINDOWFUNC
if( IN_RENAME_OBJECT ){
Window *pWin;
for(pWin=p->pWinDefn; pWin; pWin=pWin->pNextWin){
if( sqlite3ResolveExprListNames(&sNC, pWin->pOrderBy)
|| sqlite3ResolveExprListNames(&sNC, pWin->pPartition)
){
return WRC_Abort;
}
}
}
#endif
/* The ORDER BY and GROUP BY clauses may not refer to terms in
** outer queries
*/
sNC.pNext = 0;
sNC.ncFlags |= NC_AllowAgg|NC_AllowWin;
/* If this is a converted compound query, move the ORDER BY clause from
** the sub-query back to the parent query. At this point each term
** within the ORDER BY clause has been transformed to an integer value.
** These integers will be replaced by copies of the corresponding result
** set expressions by the call to resolveOrderGroupBy() below. */
if( p->selFlags & SF_Converted ){
Select *pSub = p->pSrc->a[0].pSelect;
p->pOrderBy = pSub->pOrderBy;
pSub->pOrderBy = 0;
}
/* Process the ORDER BY clause for singleton SELECT statements.
** The ORDER BY clause for compounds SELECT statements is handled
** below, after all of the result-sets for all of the elements of
** the compound have been resolved.
**
** If there is an ORDER BY clause on a term of a compound-select other
** than the right-most term, then that is a syntax error. But the error
** is not detected until much later, and so we need to go ahead and
** resolve those symbols on the incorrect ORDER BY for consistency.
*/
if( p->pOrderBy!=0
&& isCompound<=nCompound /* Defer right-most ORDER BY of a compound */
&& resolveOrderGroupBy(&sNC, p, p->pOrderBy, "ORDER")
){
return WRC_Abort;
}
if( db->mallocFailed ){
return WRC_Abort;
}
sNC.ncFlags &= ~NC_AllowWin;
/* Resolve the GROUP BY clause. At the same time, make sure
** the GROUP BY clause does not contain aggregate functions.
*/
if( pGroupBy ){
struct ExprList_item *pItem;
if( resolveOrderGroupBy(&sNC, p, pGroupBy, "GROUP") || db->mallocFailed ){
return WRC_Abort;
}
for(i=0, pItem=pGroupBy->a; i<pGroupBy->nExpr; i++, pItem++){
if( ExprHasProperty(pItem->pExpr, EP_Agg) ){
sqlite3ErrorMsg(pParse, "aggregate functions are not allowed in "
"the GROUP BY clause");
return WRC_Abort;
}
}
}
/* If this is part of a compound SELECT, check that it has the right
** number of expressions in the select list. */
if( p->pNext && p->pEList->nExpr!=p->pNext->pEList->nExpr ){
sqlite3SelectWrongNumTermsError(pParse, p->pNext);
return WRC_Abort;
}
/* Advance to the next term of the compound
*/
p = p->pPrior;
nCompound++;
}
/* Resolve the ORDER BY on a compound SELECT after all terms of
** the compound have been resolved.
*/
if( isCompound && resolveCompoundOrderBy(pParse, pLeftmost) ){
return WRC_Abort;
}
return WRC_Prune;
}
/*
** This routine walks an expression tree and resolves references to
** table columns and result-set columns. At the same time, do error
** checking on function usage and set a flag if any aggregate functions
** are seen.
**
** To resolve table columns references we look for nodes (or subtrees) of the
** form X.Y.Z or Y.Z or just Z where
**
** X: The name of a database. Ex: "main" or "temp" or
** the symbolic name assigned to an ATTACH-ed database.
**
** Y: The name of a table in a FROM clause. Or in a trigger
** one of the special names "old" or "new".
**
** Z: The name of a column in table Y.
**
** The node at the root of the subtree is modified as follows:
**
** Expr.op Changed to TK_COLUMN
** Expr.pTab Points to the Table object for X.Y
** Expr.iColumn The column index in X.Y. -1 for the rowid.
** Expr.iTable The VDBE cursor number for X.Y
**
**
** To resolve result-set references, look for expression nodes of the
** form Z (with no X and Y prefix) where the Z matches the right-hand
** size of an AS clause in the result-set of a SELECT. The Z expression
** is replaced by a copy of the left-hand side of the result-set expression.
** Table-name and function resolution occurs on the substituted expression
** tree. For example, in:
**
** SELECT a+b AS x, c+d AS y FROM t1 ORDER BY x;
**
** The "x" term of the order by is replaced by "a+b" to render:
**
** SELECT a+b AS x, c+d AS y FROM t1 ORDER BY a+b;
**
** Function calls are checked to make sure that the function is
** defined and that the correct number of arguments are specified.
** If the function is an aggregate function, then the NC_HasAgg flag is
** set and the opcode is changed from TK_FUNCTION to TK_AGG_FUNCTION.
** If an expression contains aggregate functions then the EP_Agg
** property on the expression is set.
**
** An error message is left in pParse if anything is amiss. The number
** if errors is returned.
*/
int sqlite3ResolveExprNames(
NameContext *pNC, /* Namespace to resolve expressions in. */
Expr *pExpr /* The expression to be analyzed. */
){
int savedHasAgg;
Walker w;
if( pExpr==0 ) return SQLITE_OK;
savedHasAgg = pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin|NC_OrderAgg);
pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg|NC_HasWin|NC_OrderAgg);
w.pParse = pNC->pParse;
w.xExprCallback = resolveExprStep;
w.xSelectCallback = (pNC->ncFlags & NC_NoSelect) ? 0 : resolveSelectStep;
w.xSelectCallback2 = 0;
w.u.pNC = pNC;
#if SQLITE_MAX_EXPR_DEPTH>0
w.pParse->nHeight += pExpr->nHeight;
if( sqlite3ExprCheckHeight(w.pParse, w.pParse->nHeight) ){
return SQLITE_ERROR;
}
#endif
sqlite3WalkExpr(&w, pExpr);
#if SQLITE_MAX_EXPR_DEPTH>0
w.pParse->nHeight -= pExpr->nHeight;
#endif
assert( EP_Agg==NC_HasAgg );
assert( EP_Win==NC_HasWin );
testcase( pNC->ncFlags & NC_HasAgg );
testcase( pNC->ncFlags & NC_HasWin );
ExprSetProperty(pExpr, pNC->ncFlags & (NC_HasAgg|NC_HasWin) );
pNC->ncFlags |= savedHasAgg;
return pNC->nNcErr>0 || w.pParse->nErr>0;
}
/*
** Resolve all names for all expression in an expression list. This is
** just like sqlite3ResolveExprNames() except that it works for an expression
** list rather than a single expression.
*/
int sqlite3ResolveExprListNames(
NameContext *pNC, /* Namespace to resolve expressions in. */
ExprList *pList /* The expression list to be analyzed. */
){
int i;
int savedHasAgg = 0;
Walker w;
if( pList==0 ) return WRC_Continue;
w.pParse = pNC->pParse;
w.xExprCallback = resolveExprStep;
w.xSelectCallback = resolveSelectStep;
w.xSelectCallback2 = 0;
w.u.pNC = pNC;
savedHasAgg = pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin|NC_OrderAgg);
pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg|NC_HasWin|NC_OrderAgg);
for(i=0; i<pList->nExpr; i++){
Expr *pExpr = pList->a[i].pExpr;
if( pExpr==0 ) continue;
#if SQLITE_MAX_EXPR_DEPTH>0
w.pParse->nHeight += pExpr->nHeight;
if( sqlite3ExprCheckHeight(w.pParse, w.pParse->nHeight) ){
return WRC_Abort;
}
#endif
sqlite3WalkExpr(&w, pExpr);
#if SQLITE_MAX_EXPR_DEPTH>0
w.pParse->nHeight -= pExpr->nHeight;
#endif
assert( EP_Agg==NC_HasAgg );
assert( EP_Win==NC_HasWin );
testcase( pNC->ncFlags & NC_HasAgg );
testcase( pNC->ncFlags & NC_HasWin );
if( pNC->ncFlags & (NC_HasAgg|NC_MinMaxAgg|NC_HasWin|NC_OrderAgg) ){
ExprSetProperty(pExpr, pNC->ncFlags & (NC_HasAgg|NC_HasWin) );
savedHasAgg |= pNC->ncFlags &
(NC_HasAgg|NC_MinMaxAgg|NC_HasWin|NC_OrderAgg);
pNC->ncFlags &= ~(NC_HasAgg|NC_MinMaxAgg|NC_HasWin|NC_OrderAgg);
}
if( w.pParse->nErr>0 ) return WRC_Abort;
}
pNC->ncFlags |= savedHasAgg;
return WRC_Continue;
}
/*
** Resolve all names in all expressions of a SELECT and in all
** decendents of the SELECT, including compounds off of p->pPrior,
** subqueries in expressions, and subqueries used as FROM clause
** terms.
**
** See sqlite3ResolveExprNames() for a description of the kinds of
** transformations that occur.
**
** All SELECT statements should have been expanded using
** sqlite3SelectExpand() prior to invoking this routine.
*/
void sqlite3ResolveSelectNames(
Parse *pParse, /* The parser context */
Select *p, /* The SELECT statement being coded. */
NameContext *pOuterNC /* Name context for parent SELECT statement */
){
Walker w;
assert( p!=0 );
w.xExprCallback = resolveExprStep;
w.xSelectCallback = resolveSelectStep;
w.xSelectCallback2 = 0;
w.pParse = pParse;
w.u.pNC = pOuterNC;
sqlite3WalkSelect(&w, p);
}
/*
** Resolve names in expressions that can only reference a single table
** or which cannot reference any tables at all. Examples:
**
** "type" flag
** ------------
** (1) CHECK constraints NC_IsCheck
** (2) WHERE clauses on partial indices NC_PartIdx
** (3) Expressions in indexes on expressions NC_IdxExpr
** (4) Expression arguments to VACUUM INTO. 0
** (5) GENERATED ALWAYS as expressions NC_GenCol
**
** In all cases except (4), the Expr.iTable value for Expr.op==TK_COLUMN
** nodes of the expression is set to -1 and the Expr.iColumn value is
** set to the column number. In case (4), TK_COLUMN nodes cause an error.
**
** Any errors cause an error message to be set in pParse.
*/
int sqlite3ResolveSelfReference(
Parse *pParse, /* Parsing context */
Table *pTab, /* The table being referenced, or NULL */
int type, /* NC_IsCheck, NC_PartIdx, NC_IdxExpr, NC_GenCol, or 0 */
Expr *pExpr, /* Expression to resolve. May be NULL. */
ExprList *pList /* Expression list to resolve. May be NULL. */
){
SrcList sSrc; /* Fake SrcList for pParse->pNewTable */
NameContext sNC; /* Name context for pParse->pNewTable */
int rc;
assert( type==0 || pTab!=0 );
assert( type==NC_IsCheck || type==NC_PartIdx || type==NC_IdxExpr
|| type==NC_GenCol || pTab==0 );
memset(&sNC, 0, sizeof(sNC));
memset(&sSrc, 0, sizeof(sSrc));
if( pTab ){
sSrc.nSrc = 1;
sSrc.a[0].zName = pTab->zName;
sSrc.a[0].pTab = pTab;
sSrc.a[0].iCursor = -1;
if( pTab->pSchema!=pParse->db->aDb[1].pSchema ){
/* Cause EP_FromDDL to be set on TK_FUNCTION nodes of non-TEMP
** schema elements */
type |= NC_FromDDL;
}
}
sNC.pParse = pParse;
sNC.pSrcList = &sSrc;
sNC.ncFlags = type | NC_IsDDL;
if( (rc = sqlite3ResolveExprNames(&sNC, pExpr))!=SQLITE_OK ) return rc;
if( pList ) rc = sqlite3ResolveExprListNames(&sNC, pList);
return rc;
}
| 77,863 | 2,136 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/series.c | /*
** 2015-08-18
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file demonstrates how to create a table-valued-function using
** a virtual table. This demo implements the generate_series() function
** which gives similar results to the eponymous function in PostgreSQL.
** Examples:
**
** SELECT * FROM generate_series(0,100,5);
**
** The query above returns integers from 0 through 100 counting by steps
** of 5.
**
** SELECT * FROM generate_series(0,100);
**
** Integers from 0 through 100 with a step size of 1.
**
** SELECT * FROM generate_series(20) LIMIT 10;
**
** Integers 20 through 29.
**
** HOW IT WORKS
**
** The generate_series "function" is really a virtual table with the
** following schema:
**
** CREATE TABLE generate_series(
** value,
** start HIDDEN,
** stop HIDDEN,
** step HIDDEN
** );
**
** Function arguments in queries against this virtual table are translated
** into equality constraints against successive hidden columns. In other
** words, the following pairs of queries are equivalent to each other:
**
** SELECT * FROM generate_series(0,100,5);
** SELECT * FROM generate_series WHERE start=0 AND stop=100 AND step=5;
**
** SELECT * FROM generate_series(0,100);
** SELECT * FROM generate_series WHERE start=0 AND stop=100;
**
** SELECT * FROM generate_series(20) LIMIT 10;
** SELECT * FROM generate_series WHERE start=20 LIMIT 10;
**
** The generate_series virtual table implementation leaves the xCreate method
** set to NULL. This means that it is not possible to do a CREATE VIRTUAL
** TABLE command with "generate_series" as the USING argument. Instead, there
** is a single generate_series virtual table that is always available without
** having to be created first.
**
** The xBestIndex method looks for equality constraints against the hidden
** start, stop, and step columns, and if present, it uses those constraints
** to bound the sequence of generated values. If the equality constraints
** are missing, it uses 0 for start, 4294967295 for stop, and 1 for step.
** xBestIndex returns a small cost when both start and stop are available,
** and a very large cost if either start or stop are unavailable. This
** encourages the query planner to order joins such that the bounds of the
** series are well-defined.
*/
#include "libc/assert.h"
#include "libc/str/str.h"
#include "third_party/sqlite3/sqlite3ext.h"
// clang-format off
SQLITE_EXTENSION_INIT1
#ifndef SQLITE_OMIT_VIRTUALTABLE
/* series_cursor is a subclass of sqlite3_vtab_cursor which will
** serve as the underlying representation of a cursor that scans
** over rows of the result
*/
typedef struct series_cursor series_cursor;
struct series_cursor {
sqlite3_vtab_cursor base; /* Base class - must be first */
int isDesc; /* True to count down rather than up */
sqlite3_int64 iRowid; /* The rowid */
sqlite3_int64 iValue; /* Current value ("value") */
sqlite3_int64 mnValue; /* Mimimum value ("start") */
sqlite3_int64 mxValue; /* Maximum value ("stop") */
sqlite3_int64 iStep; /* Increment ("step") */
};
/*
** The seriesConnect() method is invoked to create a new
** series_vtab that describes the generate_series virtual table.
**
** Think of this routine as the constructor for series_vtab objects.
**
** All this routine needs to do is:
**
** (1) Allocate the series_vtab object and initialize all fields.
**
** (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the
** result set of queries against generate_series will look like.
*/
static int seriesConnect(
sqlite3 *db,
void *pUnused,
int argcUnused, const char *const*argvUnused,
sqlite3_vtab **ppVtab,
char **pzErrUnused
){
sqlite3_vtab *pNew;
int rc;
/* Column numbers */
#define SERIES_COLUMN_VALUE 0
#define SERIES_COLUMN_START 1
#define SERIES_COLUMN_STOP 2
#define SERIES_COLUMN_STEP 3
(void)pUnused;
(void)argcUnused;
(void)argvUnused;
(void)pzErrUnused;
rc = sqlite3_declare_vtab(db,
"CREATE TABLE x(value,start hidden,stop hidden,step hidden)");
if( rc==SQLITE_OK ){
pNew = *ppVtab = sqlite3_malloc( sizeof(*pNew) );
if( pNew==0 ) return SQLITE_NOMEM;
memset(pNew, 0, sizeof(*pNew));
sqlite3_vtab_config(db, SQLITE_VTAB_INNOCUOUS);
}
return rc;
}
/*
** This method is the destructor for series_cursor objects.
*/
static int seriesDisconnect(sqlite3_vtab *pVtab){
sqlite3_free(pVtab);
return SQLITE_OK;
}
/*
** Constructor for a new series_cursor object.
*/
static int seriesOpen(sqlite3_vtab *pUnused, sqlite3_vtab_cursor **ppCursor){
series_cursor *pCur;
(void)pUnused;
pCur = sqlite3_malloc( sizeof(*pCur) );
if( pCur==0 ) return SQLITE_NOMEM;
memset(pCur, 0, sizeof(*pCur));
*ppCursor = &pCur->base;
return SQLITE_OK;
}
/*
** Destructor for a series_cursor.
*/
static int seriesClose(sqlite3_vtab_cursor *cur){
sqlite3_free(cur);
return SQLITE_OK;
}
/*
** Advance a series_cursor to its next row of output.
*/
static int seriesNext(sqlite3_vtab_cursor *cur){
series_cursor *pCur = (series_cursor*)cur;
if( pCur->isDesc ){
pCur->iValue -= pCur->iStep;
}else{
pCur->iValue += pCur->iStep;
}
pCur->iRowid++;
return SQLITE_OK;
}
/*
** Return values of columns for the row at which the series_cursor
** is currently pointing.
*/
static int seriesColumn(
sqlite3_vtab_cursor *cur, /* The cursor */
sqlite3_context *ctx, /* First argument to sqlite3_result_...() */
int i /* Which column to return */
){
series_cursor *pCur = (series_cursor*)cur;
sqlite3_int64 x = 0;
switch( i ){
case SERIES_COLUMN_START: x = pCur->mnValue; break;
case SERIES_COLUMN_STOP: x = pCur->mxValue; break;
case SERIES_COLUMN_STEP: x = pCur->iStep; break;
default: x = pCur->iValue; break;
}
sqlite3_result_int64(ctx, x);
return SQLITE_OK;
}
/*
** Return the rowid for the current row. In this implementation, the
** first row returned is assigned rowid value 1, and each subsequent
** row a value 1 more than that of the previous.
*/
static int seriesRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
series_cursor *pCur = (series_cursor*)cur;
*pRowid = pCur->iRowid;
return SQLITE_OK;
}
/*
** Return TRUE if the cursor has been moved off of the last
** row of output.
*/
static int seriesEof(sqlite3_vtab_cursor *cur){
series_cursor *pCur = (series_cursor*)cur;
if( pCur->isDesc ){
return pCur->iValue < pCur->mnValue;
}else{
return pCur->iValue > pCur->mxValue;
}
}
/* True to cause run-time checking of the start=, stop=, and/or step=
** parameters. The only reason to do this is for testing the
** constraint checking logic for virtual tables in the SQLite core.
*/
#ifndef SQLITE_SERIES_CONSTRAINT_VERIFY
# define SQLITE_SERIES_CONSTRAINT_VERIFY 0
#endif
/*
** This method is called to "rewind" the series_cursor object back
** to the first row of output. This method is always called at least
** once prior to any call to seriesColumn() or seriesRowid() or
** seriesEof().
**
** The query plan selected by seriesBestIndex is passed in the idxNum
** parameter. (idxStr is not used in this implementation.) idxNum
** is a bitmask showing which constraints are available:
**
** 1: start=VALUE
** 2: stop=VALUE
** 4: step=VALUE
**
** Also, if bit 8 is set, that means that the series should be output
** in descending order rather than in ascending order. If bit 16 is
** set, then output must appear in ascending order.
**
** This routine should initialize the cursor and position it so that it
** is pointing at the first row, or pointing off the end of the table
** (so that seriesEof() will return true) if the table is empty.
*/
static int seriesFilter(
sqlite3_vtab_cursor *pVtabCursor,
int idxNum, const char *idxStrUnused,
int argc, sqlite3_value **argv
){
series_cursor *pCur = (series_cursor *)pVtabCursor;
int i = 0;
(void)idxStrUnused;
if( idxNum & 1 ){
pCur->mnValue = sqlite3_value_int64(argv[i++]);
}else{
pCur->mnValue = 0;
}
if( idxNum & 2 ){
pCur->mxValue = sqlite3_value_int64(argv[i++]);
}else{
pCur->mxValue = 0xffffffff;
}
if( idxNum & 4 ){
pCur->iStep = sqlite3_value_int64(argv[i++]);
if( pCur->iStep==0 ){
pCur->iStep = 1;
}else if( pCur->iStep<0 ){
pCur->iStep = -pCur->iStep;
if( (idxNum & 16)==0 ) idxNum |= 8;
}
}else{
pCur->iStep = 1;
}
for(i=0; i<argc; i++){
if( sqlite3_value_type(argv[i])==SQLITE_NULL ){
/* If any of the constraints have a NULL value, then return no rows.
** See ticket https://www.sqlite.org/src/info/fac496b61722daf2 */
pCur->mnValue = 1;
pCur->mxValue = 0;
break;
}
}
if( idxNum & 8 ){
pCur->isDesc = 1;
pCur->iValue = pCur->mxValue;
if( pCur->iStep>0 ){
pCur->iValue -= (pCur->mxValue - pCur->mnValue)%pCur->iStep;
}
}else{
pCur->isDesc = 0;
pCur->iValue = pCur->mnValue;
}
pCur->iRowid = 1;
return SQLITE_OK;
}
/*
** SQLite will invoke this method one or more times while planning a query
** that uses the generate_series virtual table. This routine needs to create
** a query plan for each invocation and compute an estimated cost for that
** plan.
**
** In this implementation idxNum is used to represent the
** query plan. idxStr is unused.
**
** The query plan is represented by bits in idxNum:
**
** (1) start = $value -- constraint exists
** (2) stop = $value -- constraint exists
** (4) step = $value -- constraint exists
** (8) output in descending order
*/
static int seriesBestIndex(
sqlite3_vtab *tabUnused,
sqlite3_index_info *pIdxInfo
){
int i, j; /* Loop over constraints */
int idxNum = 0; /* The query plan bitmask */
int unusableMask = 0; /* Mask of unusable constraints */
int nArg = 0; /* Number of arguments that seriesFilter() expects */
int aIdx[3]; /* Constraints on start, stop, and step */
const struct sqlite3_index_constraint *pConstraint;
/* This implementation assumes that the start, stop, and step columns
** are the last three columns in the virtual table. */
assert( SERIES_COLUMN_STOP == SERIES_COLUMN_START+1 );
assert( SERIES_COLUMN_STEP == SERIES_COLUMN_START+2 );
(void)tabUnused;
aIdx[0] = aIdx[1] = aIdx[2] = -1;
pConstraint = pIdxInfo->aConstraint;
for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
int iCol; /* 0 for start, 1 for stop, 2 for step */
int iMask; /* bitmask for those column */
if( pConstraint->iColumn<SERIES_COLUMN_START ) continue;
iCol = pConstraint->iColumn - SERIES_COLUMN_START;
assert( iCol>=0 && iCol<=2 );
iMask = 1 << iCol;
if( pConstraint->usable==0 ){
unusableMask |= iMask;
continue;
}else if( pConstraint->op==SQLITE_INDEX_CONSTRAINT_EQ ){
idxNum |= iMask;
aIdx[iCol] = i;
}
}
for(i=0; i<3; i++){
if( (j = aIdx[i])>=0 ){
pIdxInfo->aConstraintUsage[j].argvIndex = ++nArg;
pIdxInfo->aConstraintUsage[j].omit = !SQLITE_SERIES_CONSTRAINT_VERIFY;
}
}
if( (unusableMask & ~idxNum)!=0 ){
/* The start, stop, and step columns are inputs. Therefore if there
** are unusable constraints on any of start, stop, or step then
** this plan is unusable */
return SQLITE_CONSTRAINT;
}
if( (idxNum & 3)==3 ){
/* Both start= and stop= boundaries are available. This is the
** the preferred case */
pIdxInfo->estimatedCost = (double)(2 - ((idxNum&4)!=0));
pIdxInfo->estimatedRows = 1000;
if( pIdxInfo->nOrderBy==1 ){
if( pIdxInfo->aOrderBy[0].desc ){
idxNum |= 8;
}else{
idxNum |= 16;
}
pIdxInfo->orderByConsumed = 1;
}
}else{
/* If either boundary is missing, we have to generate a huge span
** of numbers. Make this case very expensive so that the query
** planner will work hard to avoid it. */
pIdxInfo->estimatedRows = 2147483647;
}
pIdxInfo->idxNum = idxNum;
return SQLITE_OK;
}
/*
** This following structure defines all the methods for the
** generate_series virtual table.
*/
static sqlite3_module seriesModule = {
0, /* iVersion */
0, /* xCreate */
seriesConnect, /* xConnect */
seriesBestIndex, /* xBestIndex */
seriesDisconnect, /* xDisconnect */
0, /* xDestroy */
seriesOpen, /* xOpen - open a cursor */
seriesClose, /* xClose - close a cursor */
seriesFilter, /* xFilter - configure scan constraints */
seriesNext, /* xNext - advance a cursor */
seriesEof, /* xEof - check for end of scan */
seriesColumn, /* xColumn - read data */
seriesRowid, /* xRowid - read data */
0, /* xUpdate */
0, /* xBegin */
0, /* xSync */
0, /* xCommit */
0, /* xRollback */
0, /* xFindMethod */
0, /* xRename */
0, /* xSavepoint */
0, /* xRelease */
0, /* xRollbackTo */
0 /* xShadowName */
};
#endif /* SQLITE_OMIT_VIRTUALTABLE */
int sqlite3_series_init(
sqlite3 *db,
char **pzErrMsg,
const sqlite3_api_routines *pApi
){
int rc = SQLITE_OK;
SQLITE_EXTENSION_INIT2(pApi);
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( sqlite3_libversion_number()<3008012 ){
*pzErrMsg = sqlite3_mprintf(
"generate_series() requires SQLite 3.8.12 or later");
return SQLITE_ERROR;
}
rc = sqlite3_create_module(db, "generate_series", &seriesModule, 0);
#endif
return rc;
}
| 14,236 | 444 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/wherecode.shell.c | #include "third_party/sqlite3/wherecode.c"
| 43 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/sqlite3rbu.c | // clang-format off
/*
** 2014 August 30
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
**
** OVERVIEW
**
** The RBU extension requires that the RBU update be packaged as an
** SQLite database. The tables it expects to find are described in
** sqlite3rbu.h. Essentially, for each table xyz in the target database
** that the user wishes to write to, a corresponding data_xyz table is
** created in the RBU database and populated with one row for each row to
** update, insert or delete from the target table.
**
** The update proceeds in three stages:
**
** 1) The database is updated. The modified database pages are written
** to a *-oal file. A *-oal file is just like a *-wal file, except
** that it is named "<database>-oal" instead of "<database>-wal".
** Because regular SQLite clients do not look for file named
** "<database>-oal", they go on using the original database in
** rollback mode while the *-oal file is being generated.
**
** During this stage RBU does not update the database by writing
** directly to the target tables. Instead it creates "imposter"
** tables using the SQLITE_TESTCTRL_IMPOSTER interface that it uses
** to update each b-tree individually. All updates required by each
** b-tree are completed before moving on to the next, and all
** updates are done in sorted key order.
**
** 2) The "<database>-oal" file is moved to the equivalent "<database>-wal"
** location using a call to rename(2). Before doing this the RBU
** module takes an EXCLUSIVE lock on the database file, ensuring
** that there are no other active readers.
**
** Once the EXCLUSIVE lock is released, any other database readers
** detect the new *-wal file and read the database in wal mode. At
** this point they see the new version of the database - including
** the updates made as part of the RBU update.
**
** 3) The new *-wal file is checkpointed. This proceeds in the same way
** as a regular database checkpoint, except that a single frame is
** checkpointed each time sqlite3rbu_step() is called. If the RBU
** handle is closed before the entire *-wal file is checkpointed,
** the checkpoint progress is saved in the RBU database and the
** checkpoint can be resumed by another RBU client at some point in
** the future.
**
** POTENTIAL PROBLEMS
**
** The rename() call might not be portable. And RBU is not currently
** syncing the directory after renaming the file.
**
** When state is saved, any commit to the *-oal file and the commit to
** the RBU update database are not atomic. So if the power fails at the
** wrong moment they might get out of sync. As the main database will be
** committed before the RBU update database this will likely either just
** pass unnoticed, or result in SQLITE_CONSTRAINT errors (due to UNIQUE
** constraint violations).
**
** If some client does modify the target database mid RBU update, or some
** other error occurs, the RBU extension will keep throwing errors. It's
** not really clear how to get out of this state. The system could just
** by delete the RBU update database and *-oal file and have the device
** download the update again and start over.
**
** At present, for an UPDATE, both the new.* and old.* records are
** collected in the rbu_xyz table. And for both UPDATEs and DELETEs all
** fields are collected. This means we're probably writing a lot more
** data to disk when saving the state of an ongoing update to the RBU
** update database than is strictly necessary.
**
*/
#include "libc/assert.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "third_party/sqlite3/sqlite3.h"
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_RBU)
#include "third_party/sqlite3/sqlite3rbu.h"
#if defined(_WIN32_WCE)
// #include "third_party/sqlite3/windows.h"
#endif
/* Maximum number of prepared UPDATE statements held by this module */
#define SQLITE_RBU_UPDATE_CACHESIZE 16
/* Delta checksums disabled by default. Compile with -DRBU_ENABLE_DELTA_CKSUM
** to enable checksum verification.
*/
#ifndef RBU_ENABLE_DELTA_CKSUM
# define RBU_ENABLE_DELTA_CKSUM 0
#endif
/*
** Swap two objects of type TYPE.
*/
#if !defined(SQLITE_AMALGAMATION)
# define SWAP(TYPE,A,B) {TYPE t=A; A=B; B=t;}
#endif
/*
** Name of the URI option that causes RBU to take an exclusive lock as
** part of the incremental checkpoint operation.
*/
#define RBU_EXCLUSIVE_CHECKPOINT "rbu_exclusive_checkpoint"
/*
** The rbu_state table is used to save the state of a partially applied
** update so that it can be resumed later. The table consists of integer
** keys mapped to values as follows:
**
** RBU_STATE_STAGE:
** May be set to integer values 1, 2, 4 or 5. As follows:
** 1: the *-rbu file is currently under construction.
** 2: the *-rbu file has been constructed, but not yet moved
** to the *-wal path.
** 4: the checkpoint is underway.
** 5: the rbu update has been checkpointed.
**
** RBU_STATE_TBL:
** Only valid if STAGE==1. The target database name of the table
** currently being written.
**
** RBU_STATE_IDX:
** Only valid if STAGE==1. The target database name of the index
** currently being written, or NULL if the main table is currently being
** updated.
**
** RBU_STATE_ROW:
** Only valid if STAGE==1. Number of rows already processed for the current
** table/index.
**
** RBU_STATE_PROGRESS:
** Trbul number of sqlite3rbu_step() calls made so far as part of this
** rbu update.
**
** RBU_STATE_CKPT:
** Valid if STAGE==4. The 64-bit checksum associated with the wal-index
** header created by recovering the *-wal file. This is used to detect
** cases when another client appends frames to the *-wal file in the
** middle of an incremental checkpoint (an incremental checkpoint cannot
** be continued if this happens).
**
** RBU_STATE_COOKIE:
** Valid if STAGE==1. The current change-counter cookie value in the
** target db file.
**
** RBU_STATE_OALSZ:
** Valid if STAGE==1. The size in bytes of the *-oal file.
**
** RBU_STATE_DATATBL:
** Only valid if STAGE==1. The RBU database name of the table
** currently being read.
*/
#define RBU_STATE_STAGE 1
#define RBU_STATE_TBL 2
#define RBU_STATE_IDX 3
#define RBU_STATE_ROW 4
#define RBU_STATE_PROGRESS 5
#define RBU_STATE_CKPT 6
#define RBU_STATE_COOKIE 7
#define RBU_STATE_OALSZ 8
#define RBU_STATE_PHASEONESTEP 9
#define RBU_STATE_DATATBL 10
#define RBU_STAGE_OAL 1
#define RBU_STAGE_MOVE 2
#define RBU_STAGE_CAPTURE 3
#define RBU_STAGE_CKPT 4
#define RBU_STAGE_DONE 5
#define RBU_CREATE_STATE \
"CREATE TABLE IF NOT EXISTS %s.rbu_state(k INTEGER PRIMARY KEY, v)"
typedef struct RbuFrame RbuFrame;
typedef struct RbuObjIter RbuObjIter;
typedef struct RbuState RbuState;
typedef struct RbuSpan RbuSpan;
typedef struct rbu_vfs rbu_vfs;
typedef struct rbu_file rbu_file;
typedef struct RbuUpdateStmt RbuUpdateStmt;
#if !defined(SQLITE_AMALGAMATION)
typedef unsigned int u32;
typedef unsigned short u16;
typedef unsigned char u8;
typedef sqlite3_int64 i64;
#endif
/*
** These values must match the values defined in wal.c for the equivalent
** locks. These are not magic numbers as they are part of the SQLite file
** format.
*/
#define WAL_LOCK_WRITE 0
#define WAL_LOCK_CKPT 1
#define WAL_LOCK_READ0 3
#define SQLITE_FCNTL_RBUCNT 5149216
/*
** A structure to store values read from the rbu_state table in memory.
*/
struct RbuState {
int eStage;
char *zTbl;
char *zDataTbl;
char *zIdx;
i64 iWalCksum;
int nRow;
i64 nProgress;
u32 iCookie;
i64 iOalSz;
i64 nPhaseOneStep;
};
struct RbuUpdateStmt {
char *zMask; /* Copy of update mask used with pUpdate */
sqlite3_stmt *pUpdate; /* Last update statement (or NULL) */
RbuUpdateStmt *pNext;
};
struct RbuSpan {
const char *zSpan;
int nSpan;
};
/*
** An iterator of this type is used to iterate through all objects in
** the target database that require updating. For each such table, the
** iterator visits, in order:
**
** * the table itself,
** * each index of the table (zero or more points to visit), and
** * a special "cleanup table" state.
**
** abIndexed:
** If the table has no indexes on it, abIndexed is set to NULL. Otherwise,
** it points to an array of flags nTblCol elements in size. The flag is
** set for each column that is either a part of the PK or a part of an
** index. Or clear otherwise.
**
** If there are one or more partial indexes on the table, all fields of
** this array set set to 1. This is because in that case, the module has
** no way to tell which fields will be required to add and remove entries
** from the partial indexes.
**
*/
struct RbuObjIter {
sqlite3_stmt *pTblIter; /* Iterate through tables */
sqlite3_stmt *pIdxIter; /* Index iterator */
int nTblCol; /* Size of azTblCol[] array */
char **azTblCol; /* Array of unquoted target column names */
char **azTblType; /* Array of target column types */
int *aiSrcOrder; /* src table col -> target table col */
u8 *abTblPk; /* Array of flags, set on target PK columns */
u8 *abNotNull; /* Array of flags, set on NOT NULL columns */
u8 *abIndexed; /* Array of flags, set on indexed & PK cols */
int eType; /* Table type - an RBU_PK_XXX value */
/* Output variables. zTbl==0 implies EOF. */
int bCleanup; /* True in "cleanup" state */
const char *zTbl; /* Name of target db table */
const char *zDataTbl; /* Name of rbu db table (or null) */
const char *zIdx; /* Name of target db index (or null) */
int iTnum; /* Root page of current object */
int iPkTnum; /* If eType==EXTERNAL, root of PK index */
int bUnique; /* Current index is unique */
int nIndex; /* Number of aux. indexes on table zTbl */
/* Statements created by rbuObjIterPrepareAll() */
int nCol; /* Number of columns in current object */
sqlite3_stmt *pSelect; /* Source data */
sqlite3_stmt *pInsert; /* Statement for INSERT operations */
sqlite3_stmt *pDelete; /* Statement for DELETE ops */
sqlite3_stmt *pTmpInsert; /* Insert into rbu_tmp_$zDataTbl */
int nIdxCol;
RbuSpan *aIdxCol;
char *zIdxSql;
/* Last UPDATE used (for PK b-tree updates only), or NULL. */
RbuUpdateStmt *pRbuUpdate;
};
/*
** Values for RbuObjIter.eType
**
** 0: Table does not exist (error)
** 1: Table has an implicit rowid.
** 2: Table has an explicit IPK column.
** 3: Table has an external PK index.
** 4: Table is WITHOUT ROWID.
** 5: Table is a virtual table.
*/
#define RBU_PK_NOTABLE 0
#define RBU_PK_NONE 1
#define RBU_PK_IPK 2
#define RBU_PK_EXTERNAL 3
#define RBU_PK_WITHOUT_ROWID 4
#define RBU_PK_VTAB 5
/*
** Within the RBU_STAGE_OAL stage, each call to sqlite3rbu_step() performs
** one of the following operations.
*/
#define RBU_INSERT 1 /* Insert on a main table b-tree */
#define RBU_DELETE 2 /* Delete a row from a main table b-tree */
#define RBU_REPLACE 3 /* Delete and then insert a row */
#define RBU_IDX_DELETE 4 /* Delete a row from an aux. index b-tree */
#define RBU_IDX_INSERT 5 /* Insert on an aux. index b-tree */
#define RBU_UPDATE 6 /* Update a row in a main table b-tree */
/*
** A single step of an incremental checkpoint - frame iWalFrame of the wal
** file should be copied to page iDbPage of the database file.
*/
struct RbuFrame {
u32 iDbPage;
u32 iWalFrame;
};
/*
** RBU handle.
**
** nPhaseOneStep:
** If the RBU database contains an rbu_count table, this value is set to
** a running estimate of the number of b-tree operations required to
** finish populating the *-oal file. This allows the sqlite3_bp_progress()
** API to calculate the permyriadage progress of populating the *-oal file
** using the formula:
**
** permyriadage = (10000 * nProgress) / nPhaseOneStep
**
** nPhaseOneStep is initialized to the sum of:
**
** nRow * (nIndex + 1)
**
** for all source tables in the RBU database, where nRow is the number
** of rows in the source table and nIndex the number of indexes on the
** corresponding target database table.
**
** This estimate is accurate if the RBU update consists entirely of
** INSERT operations. However, it is inaccurate if:
**
** * the RBU update contains any UPDATE operations. If the PK specified
** for an UPDATE operation does not exist in the target table, then
** no b-tree operations are required on index b-trees. Or if the
** specified PK does exist, then (nIndex*2) such operations are
** required (one delete and one insert on each index b-tree).
**
** * the RBU update contains any DELETE operations for which the specified
** PK does not exist. In this case no operations are required on index
** b-trees.
**
** * the RBU update contains REPLACE operations. These are similar to
** UPDATE operations.
**
** nPhaseOneStep is updated to account for the conditions above during the
** first pass of each source table. The updated nPhaseOneStep value is
** stored in the rbu_state table if the RBU update is suspended.
*/
struct sqlite3rbu {
int eStage; /* Value of RBU_STATE_STAGE field */
sqlite3 *dbMain; /* target database handle */
sqlite3 *dbRbu; /* rbu database handle */
char *zTarget; /* Path to target db */
char *zRbu; /* Path to rbu db */
char *zState; /* Path to state db (or NULL if zRbu) */
char zStateDb[5]; /* Db name for state ("stat" or "main") */
int rc; /* Value returned by last rbu_step() call */
char *zErrmsg; /* Error message if rc!=SQLITE_OK */
int nStep; /* Rows processed for current object */
int nProgress; /* Rows processed for all objects */
RbuObjIter objiter; /* Iterator for skipping through tbl/idx */
const char *zVfsName; /* Name of automatically created rbu vfs */
rbu_file *pTargetFd; /* File handle open on target db */
int nPagePerSector; /* Pages per sector for pTargetFd */
i64 iOalSz;
i64 nPhaseOneStep;
void *pRenameArg;
int (*xRename)(void*, const char*, const char*);
/* The following state variables are used as part of the incremental
** checkpoint stage (eStage==RBU_STAGE_CKPT). See comments surrounding
** function rbuSetupCheckpoint() for details. */
u32 iMaxFrame; /* Largest iWalFrame value in aFrame[] */
u32 mLock;
int nFrame; /* Entries in aFrame[] array */
int nFrameAlloc; /* Allocated size of aFrame[] array */
RbuFrame *aFrame;
int pgsz;
u8 *aBuf;
i64 iWalCksum;
i64 szTemp; /* Current size of all temp files in use */
i64 szTempLimit; /* Total size limit for temp files */
/* Used in RBU vacuum mode only */
int nRbu; /* Number of RBU VFS in the stack */
rbu_file *pRbuFd; /* Fd for main db of dbRbu */
};
/*
** An rbu VFS is implemented using an instance of this structure.
**
** Variable pRbu is only non-NULL for automatically created RBU VFS objects.
** It is NULL for RBU VFS objects created explicitly using
** sqlite3rbu_create_vfs(). It is used to track the total amount of temp
** space used by the RBU handle.
*/
struct rbu_vfs {
sqlite3_vfs base; /* rbu VFS shim methods */
sqlite3_vfs *pRealVfs; /* Underlying VFS */
sqlite3_mutex *mutex; /* Mutex to protect pMain */
sqlite3rbu *pRbu; /* Owner RBU object */
rbu_file *pMain; /* List of main db files */
rbu_file *pMainRbu; /* List of main db files with pRbu!=0 */
};
/*
** Each file opened by an rbu VFS is represented by an instance of
** the following structure.
**
** If this is a temporary file (pRbu!=0 && flags&DELETE_ON_CLOSE), variable
** "sz" is set to the current size of the database file.
*/
struct rbu_file {
sqlite3_file base; /* sqlite3_file methods */
sqlite3_file *pReal; /* Underlying file handle */
rbu_vfs *pRbuVfs; /* Pointer to the rbu_vfs object */
sqlite3rbu *pRbu; /* Pointer to rbu object (rbu target only) */
i64 sz; /* Size of file in bytes (temp only) */
int openFlags; /* Flags this file was opened with */
u32 iCookie; /* Cookie value for main db files */
u8 iWriteVer; /* "write-version" value for main db files */
u8 bNolock; /* True to fail EXCLUSIVE locks */
int nShm; /* Number of entries in apShm[] array */
char **apShm; /* Array of mmap'd *-shm regions */
char *zDel; /* Delete this when closing file */
const char *zWal; /* Wal filename for this main db file */
rbu_file *pWalFd; /* Wal file descriptor for this main db */
rbu_file *pMainNext; /* Next MAIN_DB file */
rbu_file *pMainRbuNext; /* Next MAIN_DB file with pRbu!=0 */
};
/*
** True for an RBU vacuum handle, or false otherwise.
*/
#define rbuIsVacuum(p) ((p)->zTarget==0)
/*************************************************************************
** The following three functions, found below:
**
** rbuDeltaGetInt()
** rbuDeltaChecksum()
** rbuDeltaApply()
**
** are lifted from the fossil source code (http://fossil-scm.org). They
** are used to implement the scalar SQL function rbu_fossil_delta().
*/
/*
** Read bytes from *pz and convert them into a positive integer. When
** finished, leave *pz pointing to the first character past the end of
** the integer. The *pLen parameter holds the length of the string
** in *pz and is decremented once for each character in the integer.
*/
static unsigned int rbuDeltaGetInt(const char **pz, int *pLen){
static const signed char zValue[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, 36,
-1, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, -1, -1, -1, 63, -1,
};
unsigned int v = 0;
int c;
unsigned char *z = (unsigned char*)*pz;
unsigned char *zStart = z;
while( (c = zValue[0x7f&*(z++)])>=0 ){
v = (v<<6) + c;
}
z--;
*pLen -= z - zStart;
*pz = (char*)z;
return v;
}
#if RBU_ENABLE_DELTA_CKSUM
/*
** Compute a 32-bit checksum on the N-byte buffer. Return the result.
*/
static unsigned int rbuDeltaChecksum(const char *zIn, size_t N){
const unsigned char *z = (const unsigned char *)zIn;
unsigned sum0 = 0;
unsigned sum1 = 0;
unsigned sum2 = 0;
unsigned sum3 = 0;
while(N >= 16){
sum0 += ((unsigned)z[0] + z[4] + z[8] + z[12]);
sum1 += ((unsigned)z[1] + z[5] + z[9] + z[13]);
sum2 += ((unsigned)z[2] + z[6] + z[10]+ z[14]);
sum3 += ((unsigned)z[3] + z[7] + z[11]+ z[15]);
z += 16;
N -= 16;
}
while(N >= 4){
sum0 += z[0];
sum1 += z[1];
sum2 += z[2];
sum3 += z[3];
z += 4;
N -= 4;
}
sum3 += (sum2 << 8) + (sum1 << 16) + (sum0 << 24);
switch(N){
case 3: sum3 += (z[2] << 8);
case 2: sum3 += (z[1] << 16);
case 1: sum3 += (z[0] << 24);
default: ;
}
return sum3;
}
#endif
/*
** Apply a delta.
**
** The output buffer should be big enough to hold the whole output
** file and a NUL terminator at the end. The delta_output_size()
** routine will determine this size for you.
**
** The delta string should be null-terminated. But the delta string
** may contain embedded NUL characters (if the input and output are
** binary files) so we also have to pass in the length of the delta in
** the lenDelta parameter.
**
** This function returns the size of the output file in bytes (excluding
** the final NUL terminator character). Except, if the delta string is
** malformed or intended for use with a source file other than zSrc,
** then this routine returns -1.
**
** Refer to the delta_create() documentation above for a description
** of the delta file format.
*/
static int rbuDeltaApply(
const char *zSrc, /* The source or pattern file */
int lenSrc, /* Length of the source file */
const char *zDelta, /* Delta to apply to the pattern */
int lenDelta, /* Length of the delta */
char *zOut /* Write the output into this preallocated buffer */
){
unsigned int limit;
unsigned int total = 0;
#if RBU_ENABLE_DELTA_CKSUM
char *zOrigOut = zOut;
#endif
limit = rbuDeltaGetInt(&zDelta, &lenDelta);
if( *zDelta!='\n' ){
/* ERROR: size integer not terminated by "\n" */
return -1;
}
zDelta++; lenDelta--;
while( *zDelta && lenDelta>0 ){
unsigned int cnt, ofst;
cnt = rbuDeltaGetInt(&zDelta, &lenDelta);
switch( zDelta[0] ){
case '@': {
zDelta++; lenDelta--;
ofst = rbuDeltaGetInt(&zDelta, &lenDelta);
if( lenDelta>0 && zDelta[0]!=',' ){
/* ERROR: copy command not terminated by ',' */
return -1;
}
zDelta++; lenDelta--;
total += cnt;
if( total>limit ){
/* ERROR: copy exceeds output file size */
return -1;
}
if( (int)(ofst+cnt) > lenSrc ){
/* ERROR: copy extends past end of input */
return -1;
}
memcpy(zOut, &zSrc[ofst], cnt);
zOut += cnt;
break;
}
case ':': {
zDelta++; lenDelta--;
total += cnt;
if( total>limit ){
/* ERROR: insert command gives an output larger than predicted */
return -1;
}
if( (int)cnt>lenDelta ){
/* ERROR: insert count exceeds size of delta */
return -1;
}
memcpy(zOut, zDelta, cnt);
zOut += cnt;
zDelta += cnt;
lenDelta -= cnt;
break;
}
case ';': {
zDelta++; lenDelta--;
zOut[0] = 0;
#if RBU_ENABLE_DELTA_CKSUM
if( cnt!=rbuDeltaChecksum(zOrigOut, total) ){
/* ERROR: bad checksum */
return -1;
}
#endif
if( total!=limit ){
/* ERROR: generated size does not match predicted size */
return -1;
}
return total;
}
default: {
/* ERROR: unknown delta operator */
return -1;
}
}
}
/* ERROR: unterminated delta */
return -1;
}
static int rbuDeltaOutputSize(const char *zDelta, int lenDelta){
int size;
size = rbuDeltaGetInt(&zDelta, &lenDelta);
if( *zDelta!='\n' ){
/* ERROR: size integer not terminated by "\n" */
return -1;
}
return size;
}
/*
** End of code taken from fossil.
*************************************************************************/
/*
** Implementation of SQL scalar function rbu_fossil_delta().
**
** This function applies a fossil delta patch to a blob. Exactly two
** arguments must be passed to this function. The first is the blob to
** patch and the second the patch to apply. If no error occurs, this
** function returns the patched blob.
*/
static void rbuFossilDeltaFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
const char *aDelta;
int nDelta;
const char *aOrig;
int nOrig;
int nOut;
int nOut2;
char *aOut;
assert( argc==2 );
nOrig = sqlite3_value_bytes(argv[0]);
aOrig = (const char*)sqlite3_value_blob(argv[0]);
nDelta = sqlite3_value_bytes(argv[1]);
aDelta = (const char*)sqlite3_value_blob(argv[1]);
/* Figure out the size of the output */
nOut = rbuDeltaOutputSize(aDelta, nDelta);
if( nOut<0 ){
sqlite3_result_error(context, "corrupt fossil delta", -1);
return;
}
aOut = sqlite3_malloc(nOut+1);
if( aOut==0 ){
sqlite3_result_error_nomem(context);
}else{
nOut2 = rbuDeltaApply(aOrig, nOrig, aDelta, nDelta, aOut);
if( nOut2!=nOut ){
sqlite3_free(aOut);
sqlite3_result_error(context, "corrupt fossil delta", -1);
}else{
sqlite3_result_blob(context, aOut, nOut, sqlite3_free);
}
}
}
/*
** Prepare the SQL statement in buffer zSql against database handle db.
** If successful, set *ppStmt to point to the new statement and return
** SQLITE_OK.
**
** Otherwise, if an error does occur, set *ppStmt to NULL and return
** an SQLite error code. Additionally, set output variable *pzErrmsg to
** point to a buffer containing an error message. It is the responsibility
** of the caller to (eventually) free this buffer using sqlite3_free().
*/
static int prepareAndCollectError(
sqlite3 *db,
sqlite3_stmt **ppStmt,
char **pzErrmsg,
const char *zSql
){
int rc = sqlite3_prepare_v2(db, zSql, -1, ppStmt, 0);
if( rc!=SQLITE_OK ){
*pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
*ppStmt = 0;
}
return rc;
}
/*
** Reset the SQL statement passed as the first argument. Return a copy
** of the value returned by sqlite3_reset().
**
** If an error has occurred, then set *pzErrmsg to point to a buffer
** containing an error message. It is the responsibility of the caller
** to eventually free this buffer using sqlite3_free().
*/
static int resetAndCollectError(sqlite3_stmt *pStmt, char **pzErrmsg){
int rc = sqlite3_reset(pStmt);
if( rc!=SQLITE_OK ){
*pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(sqlite3_db_handle(pStmt)));
}
return rc;
}
/*
** Unless it is NULL, argument zSql points to a buffer allocated using
** sqlite3_malloc containing an SQL statement. This function prepares the SQL
** statement against database db and frees the buffer. If statement
** compilation is successful, *ppStmt is set to point to the new statement
** handle and SQLITE_OK is returned.
**
** Otherwise, if an error occurs, *ppStmt is set to NULL and an error code
** returned. In this case, *pzErrmsg may also be set to point to an error
** message. It is the responsibility of the caller to free this error message
** buffer using sqlite3_free().
**
** If argument zSql is NULL, this function assumes that an OOM has occurred.
** In this case SQLITE_NOMEM is returned and *ppStmt set to NULL.
*/
static int prepareFreeAndCollectError(
sqlite3 *db,
sqlite3_stmt **ppStmt,
char **pzErrmsg,
char *zSql
){
int rc;
assert( *pzErrmsg==0 );
if( zSql==0 ){
rc = SQLITE_NOMEM;
*ppStmt = 0;
}else{
rc = prepareAndCollectError(db, ppStmt, pzErrmsg, zSql);
sqlite3_free(zSql);
}
return rc;
}
/*
** Free the RbuObjIter.azTblCol[] and RbuObjIter.abTblPk[] arrays allocated
** by an earlier call to rbuObjIterCacheTableInfo().
*/
static void rbuObjIterFreeCols(RbuObjIter *pIter){
int i;
for(i=0; i<pIter->nTblCol; i++){
sqlite3_free(pIter->azTblCol[i]);
sqlite3_free(pIter->azTblType[i]);
}
sqlite3_free(pIter->azTblCol);
pIter->azTblCol = 0;
pIter->azTblType = 0;
pIter->aiSrcOrder = 0;
pIter->abTblPk = 0;
pIter->abNotNull = 0;
pIter->nTblCol = 0;
pIter->eType = 0; /* Invalid value */
}
/*
** Finalize all statements and free all allocations that are specific to
** the current object (table/index pair).
*/
static void rbuObjIterClearStatements(RbuObjIter *pIter){
RbuUpdateStmt *pUp;
sqlite3_finalize(pIter->pSelect);
sqlite3_finalize(pIter->pInsert);
sqlite3_finalize(pIter->pDelete);
sqlite3_finalize(pIter->pTmpInsert);
pUp = pIter->pRbuUpdate;
while( pUp ){
RbuUpdateStmt *pTmp = pUp->pNext;
sqlite3_finalize(pUp->pUpdate);
sqlite3_free(pUp);
pUp = pTmp;
}
sqlite3_free(pIter->aIdxCol);
sqlite3_free(pIter->zIdxSql);
pIter->pSelect = 0;
pIter->pInsert = 0;
pIter->pDelete = 0;
pIter->pRbuUpdate = 0;
pIter->pTmpInsert = 0;
pIter->nCol = 0;
pIter->nIdxCol = 0;
pIter->aIdxCol = 0;
pIter->zIdxSql = 0;
}
/*
** Clean up any resources allocated as part of the iterator object passed
** as the only argument.
*/
static void rbuObjIterFinalize(RbuObjIter *pIter){
rbuObjIterClearStatements(pIter);
sqlite3_finalize(pIter->pTblIter);
sqlite3_finalize(pIter->pIdxIter);
rbuObjIterFreeCols(pIter);
memset(pIter, 0, sizeof(RbuObjIter));
}
/*
** Advance the iterator to the next position.
**
** If no error occurs, SQLITE_OK is returned and the iterator is left
** pointing to the next entry. Otherwise, an error code and message is
** left in the RBU handle passed as the first argument. A copy of the
** error code is returned.
*/
static int rbuObjIterNext(sqlite3rbu *p, RbuObjIter *pIter){
int rc = p->rc;
if( rc==SQLITE_OK ){
/* Free any SQLite statements used while processing the previous object */
rbuObjIterClearStatements(pIter);
if( pIter->zIdx==0 ){
rc = sqlite3_exec(p->dbMain,
"DROP TRIGGER IF EXISTS temp.rbu_insert_tr;"
"DROP TRIGGER IF EXISTS temp.rbu_update1_tr;"
"DROP TRIGGER IF EXISTS temp.rbu_update2_tr;"
"DROP TRIGGER IF EXISTS temp.rbu_delete_tr;"
, 0, 0, &p->zErrmsg
);
}
if( rc==SQLITE_OK ){
if( pIter->bCleanup ){
rbuObjIterFreeCols(pIter);
pIter->bCleanup = 0;
rc = sqlite3_step(pIter->pTblIter);
if( rc!=SQLITE_ROW ){
rc = resetAndCollectError(pIter->pTblIter, &p->zErrmsg);
pIter->zTbl = 0;
}else{
pIter->zTbl = (const char*)sqlite3_column_text(pIter->pTblIter, 0);
pIter->zDataTbl = (const char*)sqlite3_column_text(pIter->pTblIter,1);
rc = (pIter->zDataTbl && pIter->zTbl) ? SQLITE_OK : SQLITE_NOMEM;
}
}else{
if( pIter->zIdx==0 ){
sqlite3_stmt *pIdx = pIter->pIdxIter;
rc = sqlite3_bind_text(pIdx, 1, pIter->zTbl, -1, SQLITE_STATIC);
}
if( rc==SQLITE_OK ){
rc = sqlite3_step(pIter->pIdxIter);
if( rc!=SQLITE_ROW ){
rc = resetAndCollectError(pIter->pIdxIter, &p->zErrmsg);
pIter->bCleanup = 1;
pIter->zIdx = 0;
}else{
pIter->zIdx = (const char*)sqlite3_column_text(pIter->pIdxIter, 0);
pIter->iTnum = sqlite3_column_int(pIter->pIdxIter, 1);
pIter->bUnique = sqlite3_column_int(pIter->pIdxIter, 2);
rc = pIter->zIdx ? SQLITE_OK : SQLITE_NOMEM;
}
}
}
}
}
if( rc!=SQLITE_OK ){
rbuObjIterFinalize(pIter);
p->rc = rc;
}
return rc;
}
/*
** The implementation of the rbu_target_name() SQL function. This function
** accepts one or two arguments. The first argument is the name of a table -
** the name of a table in the RBU database. The second, if it is present, is 1
** for a view or 0 for a table.
**
** For a non-vacuum RBU handle, if the table name matches the pattern:
**
** data[0-9]_<name>
**
** where <name> is any sequence of 1 or more characters, <name> is returned.
** Otherwise, if the only argument does not match the above pattern, an SQL
** NULL is returned.
**
** "data_t1" -> "t1"
** "data0123_t2" -> "t2"
** "dataAB_t3" -> NULL
**
** For an rbu vacuum handle, a copy of the first argument is returned if
** the second argument is either missing or 0 (not a view).
*/
static void rbuTargetNameFunc(
sqlite3_context *pCtx,
int argc,
sqlite3_value **argv
){
sqlite3rbu *p = sqlite3_user_data(pCtx);
const char *zIn;
assert( argc==1 || argc==2 );
zIn = (const char*)sqlite3_value_text(argv[0]);
if( zIn ){
if( rbuIsVacuum(p) ){
assert( argc==2 || argc==1 );
if( argc==1 || 0==sqlite3_value_int(argv[1]) ){
sqlite3_result_text(pCtx, zIn, -1, SQLITE_STATIC);
}
}else{
if( strlen(zIn)>4 && memcmp("data", zIn, 4)==0 ){
int i;
for(i=4; zIn[i]>='0' && zIn[i]<='9'; i++);
if( zIn[i]=='_' && zIn[i+1] ){
sqlite3_result_text(pCtx, &zIn[i+1], -1, SQLITE_STATIC);
}
}
}
}
}
/*
** Initialize the iterator structure passed as the second argument.
**
** If no error occurs, SQLITE_OK is returned and the iterator is left
** pointing to the first entry. Otherwise, an error code and message is
** left in the RBU handle passed as the first argument. A copy of the
** error code is returned.
*/
static int rbuObjIterFirst(sqlite3rbu *p, RbuObjIter *pIter){
int rc;
memset(pIter, 0, sizeof(RbuObjIter));
rc = prepareFreeAndCollectError(p->dbRbu, &pIter->pTblIter, &p->zErrmsg,
sqlite3_mprintf(
"SELECT rbu_target_name(name, type='view') AS target, name "
"FROM sqlite_schema "
"WHERE type IN ('table', 'view') AND target IS NOT NULL "
" %s "
"ORDER BY name"
, rbuIsVacuum(p) ? "AND rootpage!=0 AND rootpage IS NOT NULL" : ""));
if( rc==SQLITE_OK ){
rc = prepareAndCollectError(p->dbMain, &pIter->pIdxIter, &p->zErrmsg,
"SELECT name, rootpage, sql IS NULL OR substr(8, 6)=='UNIQUE' "
" FROM main.sqlite_schema "
" WHERE type='index' AND tbl_name = ?"
);
}
pIter->bCleanup = 1;
p->rc = rc;
return rbuObjIterNext(p, pIter);
}
/*
** This is a wrapper around "sqlite3_mprintf(zFmt, ...)". If an OOM occurs,
** an error code is stored in the RBU handle passed as the first argument.
**
** If an error has already occurred (p->rc is already set to something other
** than SQLITE_OK), then this function returns NULL without modifying the
** stored error code. In this case it still calls sqlite3_free() on any
** printf() parameters associated with %z conversions.
*/
static char *rbuMPrintf(sqlite3rbu *p, const char *zFmt, ...){
char *zSql = 0;
va_list ap;
va_start(ap, zFmt);
zSql = sqlite3_vmprintf(zFmt, ap);
if( p->rc==SQLITE_OK ){
if( zSql==0 ) p->rc = SQLITE_NOMEM;
}else{
sqlite3_free(zSql);
zSql = 0;
}
va_end(ap);
return zSql;
}
/*
** Argument zFmt is a sqlite3_mprintf() style format string. The trailing
** arguments are the usual subsitution values. This function performs
** the printf() style substitutions and executes the result as an SQL
** statement on the RBU handles database.
**
** If an error occurs, an error code and error message is stored in the
** RBU handle. If an error has already occurred when this function is
** called, it is a no-op.
*/
static int rbuMPrintfExec(sqlite3rbu *p, sqlite3 *db, const char *zFmt, ...){
va_list ap;
char *zSql;
va_start(ap, zFmt);
zSql = sqlite3_vmprintf(zFmt, ap);
if( p->rc==SQLITE_OK ){
if( zSql==0 ){
p->rc = SQLITE_NOMEM;
}else{
p->rc = sqlite3_exec(db, zSql, 0, 0, &p->zErrmsg);
}
}
sqlite3_free(zSql);
va_end(ap);
return p->rc;
}
/*
** Attempt to allocate and return a pointer to a zeroed block of nByte
** bytes.
**
** If an error (i.e. an OOM condition) occurs, return NULL and leave an
** error code in the rbu handle passed as the first argument. Or, if an
** error has already occurred when this function is called, return NULL
** immediately without attempting the allocation or modifying the stored
** error code.
*/
static void *rbuMalloc(sqlite3rbu *p, sqlite3_int64 nByte){
void *pRet = 0;
if( p->rc==SQLITE_OK ){
assert( nByte>0 );
pRet = sqlite3_malloc64(nByte);
if( pRet==0 ){
p->rc = SQLITE_NOMEM;
}else{
memset(pRet, 0, nByte);
}
}
return pRet;
}
/*
** Allocate and zero the pIter->azTblCol[] and abTblPk[] arrays so that
** there is room for at least nCol elements. If an OOM occurs, store an
** error code in the RBU handle passed as the first argument.
*/
static void rbuAllocateIterArrays(sqlite3rbu *p, RbuObjIter *pIter, int nCol){
sqlite3_int64 nByte = (2*sizeof(char*) + sizeof(int) + 3*sizeof(u8)) * nCol;
char **azNew;
azNew = (char**)rbuMalloc(p, nByte);
if( azNew ){
pIter->azTblCol = azNew;
pIter->azTblType = &azNew[nCol];
pIter->aiSrcOrder = (int*)&pIter->azTblType[nCol];
pIter->abTblPk = (u8*)&pIter->aiSrcOrder[nCol];
pIter->abNotNull = (u8*)&pIter->abTblPk[nCol];
pIter->abIndexed = (u8*)&pIter->abNotNull[nCol];
}
}
/*
** The first argument must be a nul-terminated string. This function
** returns a copy of the string in memory obtained from sqlite3_malloc().
** It is the responsibility of the caller to eventually free this memory
** using sqlite3_free().
**
** If an OOM condition is encountered when attempting to allocate memory,
** output variable (*pRc) is set to SQLITE_NOMEM before returning. Otherwise,
** if the allocation succeeds, (*pRc) is left unchanged.
*/
static char *rbuStrndup(const char *zStr, int *pRc){
char *zRet = 0;
if( *pRc==SQLITE_OK ){
if( zStr ){
size_t nCopy = strlen(zStr) + 1;
zRet = (char*)sqlite3_malloc64(nCopy);
if( zRet ){
memcpy(zRet, zStr, nCopy);
}else{
*pRc = SQLITE_NOMEM;
}
}
}
return zRet;
}
/*
** Finalize the statement passed as the second argument.
**
** If the sqlite3_finalize() call indicates that an error occurs, and the
** rbu handle error code is not already set, set the error code and error
** message accordingly.
*/
static void rbuFinalize(sqlite3rbu *p, sqlite3_stmt *pStmt){
sqlite3 *db = sqlite3_db_handle(pStmt);
int rc = sqlite3_finalize(pStmt);
if( p->rc==SQLITE_OK && rc!=SQLITE_OK ){
p->rc = rc;
p->zErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
}
}
/* Determine the type of a table.
**
** peType is of type (int*), a pointer to an output parameter of type
** (int). This call sets the output parameter as follows, depending
** on the type of the table specified by parameters dbName and zTbl.
**
** RBU_PK_NOTABLE: No such table.
** RBU_PK_NONE: Table has an implicit rowid.
** RBU_PK_IPK: Table has an explicit IPK column.
** RBU_PK_EXTERNAL: Table has an external PK index.
** RBU_PK_WITHOUT_ROWID: Table is WITHOUT ROWID.
** RBU_PK_VTAB: Table is a virtual table.
**
** Argument *piPk is also of type (int*), and also points to an output
** parameter. Unless the table has an external primary key index
** (i.e. unless *peType is set to 3), then *piPk is set to zero. Or,
** if the table does have an external primary key index, then *piPk
** is set to the root page number of the primary key index before
** returning.
**
** ALGORITHM:
**
** if( no entry exists in sqlite_schema ){
** return RBU_PK_NOTABLE
** }else if( sql for the entry starts with "CREATE VIRTUAL" ){
** return RBU_PK_VTAB
** }else if( "PRAGMA index_list()" for the table contains a "pk" index ){
** if( the index that is the pk exists in sqlite_schema ){
** *piPK = rootpage of that index.
** return RBU_PK_EXTERNAL
** }else{
** return RBU_PK_WITHOUT_ROWID
** }
** }else if( "PRAGMA table_info()" lists one or more "pk" columns ){
** return RBU_PK_IPK
** }else{
** return RBU_PK_NONE
** }
*/
static void rbuTableType(
sqlite3rbu *p,
const char *zTab,
int *peType,
int *piTnum,
int *piPk
){
/*
** 0) SELECT count(*) FROM sqlite_schema where name=%Q AND IsVirtual(%Q)
** 1) PRAGMA index_list = ?
** 2) SELECT count(*) FROM sqlite_schema where name=%Q
** 3) PRAGMA table_info = ?
*/
sqlite3_stmt *aStmt[4] = {0, 0, 0, 0};
*peType = RBU_PK_NOTABLE;
*piPk = 0;
assert( p->rc==SQLITE_OK );
p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[0], &p->zErrmsg,
sqlite3_mprintf(
"SELECT "
" (sql COLLATE nocase BETWEEN 'CREATE VIRTUAL' AND 'CREATE VIRTUAM'),"
" rootpage"
" FROM sqlite_schema"
" WHERE name=%Q", zTab
));
if( p->rc!=SQLITE_OK || sqlite3_step(aStmt[0])!=SQLITE_ROW ){
/* Either an error, or no such table. */
goto rbuTableType_end;
}
if( sqlite3_column_int(aStmt[0], 0) ){
*peType = RBU_PK_VTAB; /* virtual table */
goto rbuTableType_end;
}
*piTnum = sqlite3_column_int(aStmt[0], 1);
p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[1], &p->zErrmsg,
sqlite3_mprintf("PRAGMA index_list=%Q",zTab)
);
if( p->rc ) goto rbuTableType_end;
while( sqlite3_step(aStmt[1])==SQLITE_ROW ){
const u8 *zOrig = sqlite3_column_text(aStmt[1], 3);
const u8 *zIdx = sqlite3_column_text(aStmt[1], 1);
if( zOrig && zIdx && zOrig[0]=='p' ){
p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[2], &p->zErrmsg,
sqlite3_mprintf(
"SELECT rootpage FROM sqlite_schema WHERE name = %Q", zIdx
));
if( p->rc==SQLITE_OK ){
if( sqlite3_step(aStmt[2])==SQLITE_ROW ){
*piPk = sqlite3_column_int(aStmt[2], 0);
*peType = RBU_PK_EXTERNAL;
}else{
*peType = RBU_PK_WITHOUT_ROWID;
}
}
goto rbuTableType_end;
}
}
p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[3], &p->zErrmsg,
sqlite3_mprintf("PRAGMA table_info=%Q",zTab)
);
if( p->rc==SQLITE_OK ){
while( sqlite3_step(aStmt[3])==SQLITE_ROW ){
if( sqlite3_column_int(aStmt[3],5)>0 ){
*peType = RBU_PK_IPK; /* explicit IPK column */
goto rbuTableType_end;
}
}
*peType = RBU_PK_NONE;
}
rbuTableType_end: {
unsigned int i;
for(i=0; i<sizeof(aStmt)/sizeof(aStmt[0]); i++){
rbuFinalize(p, aStmt[i]);
}
}
}
/*
** This is a helper function for rbuObjIterCacheTableInfo(). It populates
** the pIter->abIndexed[] array.
*/
static void rbuObjIterCacheIndexedCols(sqlite3rbu *p, RbuObjIter *pIter){
sqlite3_stmt *pList = 0;
int bIndex = 0;
if( p->rc==SQLITE_OK ){
memcpy(pIter->abIndexed, pIter->abTblPk, sizeof(u8)*pIter->nTblCol);
p->rc = prepareFreeAndCollectError(p->dbMain, &pList, &p->zErrmsg,
sqlite3_mprintf("PRAGMA main.index_list = %Q", pIter->zTbl)
);
}
pIter->nIndex = 0;
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pList) ){
const char *zIdx = (const char*)sqlite3_column_text(pList, 1);
int bPartial = sqlite3_column_int(pList, 4);
sqlite3_stmt *pXInfo = 0;
if( zIdx==0 ) break;
if( bPartial ){
memset(pIter->abIndexed, 0x01, sizeof(u8)*pIter->nTblCol);
}
p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", zIdx)
);
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
int iCid = sqlite3_column_int(pXInfo, 1);
if( iCid>=0 ) pIter->abIndexed[iCid] = 1;
if( iCid==-2 ){
memset(pIter->abIndexed, 0x01, sizeof(u8)*pIter->nTblCol);
}
}
rbuFinalize(p, pXInfo);
bIndex = 1;
pIter->nIndex++;
}
if( pIter->eType==RBU_PK_WITHOUT_ROWID ){
/* "PRAGMA index_list" includes the main PK b-tree */
pIter->nIndex--;
}
rbuFinalize(p, pList);
if( bIndex==0 ) pIter->abIndexed = 0;
}
/*
** If they are not already populated, populate the pIter->azTblCol[],
** pIter->abTblPk[], pIter->nTblCol and pIter->bRowid variables according to
** the table (not index) that the iterator currently points to.
**
** Return SQLITE_OK if successful, or an SQLite error code otherwise. If
** an error does occur, an error code and error message are also left in
** the RBU handle.
*/
static int rbuObjIterCacheTableInfo(sqlite3rbu *p, RbuObjIter *pIter){
if( pIter->azTblCol==0 ){
sqlite3_stmt *pStmt = 0;
int nCol = 0;
int i; /* for() loop iterator variable */
int bRbuRowid = 0; /* If input table has column "rbu_rowid" */
int iOrder = 0;
int iTnum = 0;
/* Figure out the type of table this step will deal with. */
assert( pIter->eType==0 );
rbuTableType(p, pIter->zTbl, &pIter->eType, &iTnum, &pIter->iPkTnum);
if( p->rc==SQLITE_OK && pIter->eType==RBU_PK_NOTABLE ){
p->rc = SQLITE_ERROR;
p->zErrmsg = sqlite3_mprintf("no such table: %s", pIter->zTbl);
}
if( p->rc ) return p->rc;
if( pIter->zIdx==0 ) pIter->iTnum = iTnum;
assert( pIter->eType==RBU_PK_NONE || pIter->eType==RBU_PK_IPK
|| pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_WITHOUT_ROWID
|| pIter->eType==RBU_PK_VTAB
);
/* Populate the azTblCol[] and nTblCol variables based on the columns
** of the input table. Ignore any input table columns that begin with
** "rbu_". */
p->rc = prepareFreeAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
sqlite3_mprintf("SELECT * FROM '%q'", pIter->zDataTbl)
);
if( p->rc==SQLITE_OK ){
nCol = sqlite3_column_count(pStmt);
rbuAllocateIterArrays(p, pIter, nCol);
}
for(i=0; p->rc==SQLITE_OK && i<nCol; i++){
const char *zName = (const char*)sqlite3_column_name(pStmt, i);
if( sqlite3_strnicmp("rbu_", zName, 4) ){
char *zCopy = rbuStrndup(zName, &p->rc);
pIter->aiSrcOrder[pIter->nTblCol] = pIter->nTblCol;
pIter->azTblCol[pIter->nTblCol++] = zCopy;
}
else if( 0==sqlite3_stricmp("rbu_rowid", zName) ){
bRbuRowid = 1;
}
}
sqlite3_finalize(pStmt);
pStmt = 0;
if( p->rc==SQLITE_OK
&& rbuIsVacuum(p)==0
&& bRbuRowid!=(pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE)
){
p->rc = SQLITE_ERROR;
p->zErrmsg = sqlite3_mprintf(
"table %q %s rbu_rowid column", pIter->zDataTbl,
(bRbuRowid ? "may not have" : "requires")
);
}
/* Check that all non-HIDDEN columns in the destination table are also
** present in the input table. Populate the abTblPk[], azTblType[] and
** aiTblOrder[] arrays at the same time. */
if( p->rc==SQLITE_OK ){
p->rc = prepareFreeAndCollectError(p->dbMain, &pStmt, &p->zErrmsg,
sqlite3_mprintf("PRAGMA table_info(%Q)", pIter->zTbl)
);
}
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
const char *zName = (const char*)sqlite3_column_text(pStmt, 1);
if( zName==0 ) break; /* An OOM - finalize() below returns S_NOMEM */
for(i=iOrder; i<pIter->nTblCol; i++){
if( 0==strcmp(zName, pIter->azTblCol[i]) ) break;
}
if( i==pIter->nTblCol ){
p->rc = SQLITE_ERROR;
p->zErrmsg = sqlite3_mprintf("column missing from %q: %s",
pIter->zDataTbl, zName
);
}else{
int iPk = sqlite3_column_int(pStmt, 5);
int bNotNull = sqlite3_column_int(pStmt, 3);
const char *zType = (const char*)sqlite3_column_text(pStmt, 2);
if( i!=iOrder ){
SWAP(int, pIter->aiSrcOrder[i], pIter->aiSrcOrder[iOrder]);
SWAP(char*, pIter->azTblCol[i], pIter->azTblCol[iOrder]);
}
pIter->azTblType[iOrder] = rbuStrndup(zType, &p->rc);
assert( iPk>=0 );
pIter->abTblPk[iOrder] = (u8)iPk;
pIter->abNotNull[iOrder] = (u8)bNotNull || (iPk!=0);
iOrder++;
}
}
rbuFinalize(p, pStmt);
rbuObjIterCacheIndexedCols(p, pIter);
assert( pIter->eType!=RBU_PK_VTAB || pIter->abIndexed==0 );
assert( pIter->eType!=RBU_PK_VTAB || pIter->nIndex==0 );
}
return p->rc;
}
/*
** This function constructs and returns a pointer to a nul-terminated
** string containing some SQL clause or list based on one or more of the
** column names currently stored in the pIter->azTblCol[] array.
*/
static char *rbuObjIterGetCollist(
sqlite3rbu *p, /* RBU object */
RbuObjIter *pIter /* Object iterator for column names */
){
char *zList = 0;
const char *zSep = "";
int i;
for(i=0; i<pIter->nTblCol; i++){
const char *z = pIter->azTblCol[i];
zList = rbuMPrintf(p, "%z%s\"%w\"", zList, zSep, z);
zSep = ", ";
}
return zList;
}
/*
** Return a comma separated list of the quoted PRIMARY KEY column names,
** in order, for the current table. Before each column name, add the text
** zPre. After each column name, add the zPost text. Use zSeparator as
** the separator text (usually ", ").
*/
static char *rbuObjIterGetPkList(
sqlite3rbu *p, /* RBU object */
RbuObjIter *pIter, /* Object iterator for column names */
const char *zPre, /* Before each quoted column name */
const char *zSeparator, /* Separator to use between columns */
const char *zPost /* After each quoted column name */
){
int iPk = 1;
char *zRet = 0;
const char *zSep = "";
while( 1 ){
int i;
for(i=0; i<pIter->nTblCol; i++){
if( (int)pIter->abTblPk[i]==iPk ){
const char *zCol = pIter->azTblCol[i];
zRet = rbuMPrintf(p, "%z%s%s\"%w\"%s", zRet, zSep, zPre, zCol, zPost);
zSep = zSeparator;
break;
}
}
if( i==pIter->nTblCol ) break;
iPk++;
}
return zRet;
}
/*
** This function is called as part of restarting an RBU vacuum within
** stage 1 of the process (while the *-oal file is being built) while
** updating a table (not an index). The table may be a rowid table or
** a WITHOUT ROWID table. It queries the target database to find the
** largest key that has already been written to the target table and
** constructs a WHERE clause that can be used to extract the remaining
** rows from the source table. For a rowid table, the WHERE clause
** is of the form:
**
** "WHERE _rowid_ > ?"
**
** and for WITHOUT ROWID tables:
**
** "WHERE (key1, key2) > (?, ?)"
**
** Instead of "?" placeholders, the actual WHERE clauses created by
** this function contain literal SQL values.
*/
static char *rbuVacuumTableStart(
sqlite3rbu *p, /* RBU handle */
RbuObjIter *pIter, /* RBU iterator object */
int bRowid, /* True for a rowid table */
const char *zWrite /* Target table name prefix */
){
sqlite3_stmt *pMax = 0;
char *zRet = 0;
if( bRowid ){
p->rc = prepareFreeAndCollectError(p->dbMain, &pMax, &p->zErrmsg,
sqlite3_mprintf(
"SELECT max(_rowid_) FROM \"%s%w\"", zWrite, pIter->zTbl
)
);
if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pMax) ){
sqlite3_int64 iMax = sqlite3_column_int64(pMax, 0);
zRet = rbuMPrintf(p, " WHERE _rowid_ > %lld ", iMax);
}
rbuFinalize(p, pMax);
}else{
char *zOrder = rbuObjIterGetPkList(p, pIter, "", ", ", " DESC");
char *zSelect = rbuObjIterGetPkList(p, pIter, "quote(", "||','||", ")");
char *zList = rbuObjIterGetPkList(p, pIter, "", ", ", "");
if( p->rc==SQLITE_OK ){
p->rc = prepareFreeAndCollectError(p->dbMain, &pMax, &p->zErrmsg,
sqlite3_mprintf(
"SELECT %s FROM \"%s%w\" ORDER BY %s LIMIT 1",
zSelect, zWrite, pIter->zTbl, zOrder
)
);
if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pMax) ){
const char *zVal = (const char*)sqlite3_column_text(pMax, 0);
zRet = rbuMPrintf(p, " WHERE (%s) > (%s) ", zList, zVal);
}
rbuFinalize(p, pMax);
}
sqlite3_free(zOrder);
sqlite3_free(zSelect);
sqlite3_free(zList);
}
return zRet;
}
/*
** This function is called as part of restating an RBU vacuum when the
** current operation is writing content to an index. If possible, it
** queries the target index b-tree for the largest key already written to
** it, then composes and returns an expression that can be used in a WHERE
** clause to select the remaining required rows from the source table.
** It is only possible to return such an expression if:
**
** * The index contains no DESC columns, and
** * The last key written to the index before the operation was
** suspended does not contain any NULL values.
**
** The expression is of the form:
**
** (index-field1, index-field2, ...) > (?, ?, ...)
**
** except that the "?" placeholders are replaced with literal values.
**
** If the expression cannot be created, NULL is returned. In this case,
** the caller has to use an OFFSET clause to extract only the required
** rows from the sourct table, just as it does for an RBU update operation.
*/
static char *rbuVacuumIndexStart(
sqlite3rbu *p, /* RBU handle */
RbuObjIter *pIter /* RBU iterator object */
){
char *zOrder = 0;
char *zLhs = 0;
char *zSelect = 0;
char *zVector = 0;
char *zRet = 0;
int bFailed = 0;
const char *zSep = "";
int iCol = 0;
sqlite3_stmt *pXInfo = 0;
p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", pIter->zIdx)
);
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
int iCid = sqlite3_column_int(pXInfo, 1);
const char *zCollate = (const char*)sqlite3_column_text(pXInfo, 4);
const char *zCol;
if( sqlite3_column_int(pXInfo, 3) ){
bFailed = 1;
break;
}
if( iCid<0 ){
if( pIter->eType==RBU_PK_IPK ){
int i;
for(i=0; pIter->abTblPk[i]==0; i++);
assert( i<pIter->nTblCol );
zCol = pIter->azTblCol[i];
}else{
zCol = "_rowid_";
}
}else{
zCol = pIter->azTblCol[iCid];
}
zLhs = rbuMPrintf(p, "%z%s \"%w\" COLLATE %Q",
zLhs, zSep, zCol, zCollate
);
zOrder = rbuMPrintf(p, "%z%s \"rbu_imp_%d%w\" COLLATE %Q DESC",
zOrder, zSep, iCol, zCol, zCollate
);
zSelect = rbuMPrintf(p, "%z%s quote(\"rbu_imp_%d%w\")",
zSelect, zSep, iCol, zCol
);
zSep = ", ";
iCol++;
}
rbuFinalize(p, pXInfo);
if( bFailed ) goto index_start_out;
if( p->rc==SQLITE_OK ){
sqlite3_stmt *pSel = 0;
p->rc = prepareFreeAndCollectError(p->dbMain, &pSel, &p->zErrmsg,
sqlite3_mprintf("SELECT %s FROM \"rbu_imp_%w\" ORDER BY %s LIMIT 1",
zSelect, pIter->zTbl, zOrder
)
);
if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSel) ){
zSep = "";
for(iCol=0; iCol<pIter->nCol; iCol++){
const char *zQuoted = (const char*)sqlite3_column_text(pSel, iCol);
if( zQuoted==0 ){
p->rc = SQLITE_NOMEM;
}else if( zQuoted[0]=='N' ){
bFailed = 1;
break;
}
zVector = rbuMPrintf(p, "%z%s%s", zVector, zSep, zQuoted);
zSep = ", ";
}
if( !bFailed ){
zRet = rbuMPrintf(p, "(%s) > (%s)", zLhs, zVector);
}
}
rbuFinalize(p, pSel);
}
index_start_out:
sqlite3_free(zOrder);
sqlite3_free(zSelect);
sqlite3_free(zVector);
sqlite3_free(zLhs);
return zRet;
}
/*
** This function is used to create a SELECT list (the list of SQL
** expressions that follows a SELECT keyword) for a SELECT statement
** used to read from an data_xxx or rbu_tmp_xxx table while updating the
** index object currently indicated by the iterator object passed as the
** second argument. A "PRAGMA index_xinfo = <idxname>" statement is used
** to obtain the required information.
**
** If the index is of the following form:
**
** CREATE INDEX i1 ON t1(c, b COLLATE nocase);
**
** and "t1" is a table with an explicit INTEGER PRIMARY KEY column
** "ipk", the returned string is:
**
** "`c` COLLATE 'BINARY', `b` COLLATE 'NOCASE', `ipk` COLLATE 'BINARY'"
**
** As well as the returned string, three other malloc'd strings are
** returned via output parameters. As follows:
**
** pzImposterCols: ...
** pzImposterPk: ...
** pzWhere: ...
*/
static char *rbuObjIterGetIndexCols(
sqlite3rbu *p, /* RBU object */
RbuObjIter *pIter, /* Object iterator for column names */
char **pzImposterCols, /* OUT: Columns for imposter table */
char **pzImposterPk, /* OUT: Imposter PK clause */
char **pzWhere, /* OUT: WHERE clause */
int *pnBind /* OUT: Trbul number of columns */
){
int rc = p->rc; /* Error code */
int rc2; /* sqlite3_finalize() return code */
char *zRet = 0; /* String to return */
char *zImpCols = 0; /* String to return via *pzImposterCols */
char *zImpPK = 0; /* String to return via *pzImposterPK */
char *zWhere = 0; /* String to return via *pzWhere */
int nBind = 0; /* Value to return via *pnBind */
const char *zCom = ""; /* Set to ", " later on */
const char *zAnd = ""; /* Set to " AND " later on */
sqlite3_stmt *pXInfo = 0; /* PRAGMA index_xinfo = ? */
if( rc==SQLITE_OK ){
assert( p->zErrmsg==0 );
rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", pIter->zIdx)
);
}
while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
int iCid = sqlite3_column_int(pXInfo, 1);
int bDesc = sqlite3_column_int(pXInfo, 3);
const char *zCollate = (const char*)sqlite3_column_text(pXInfo, 4);
const char *zCol = 0;
const char *zType;
if( iCid==-2 ){
int iSeq = sqlite3_column_int(pXInfo, 0);
zRet = sqlite3_mprintf("%z%s(%.*s) COLLATE %Q", zRet, zCom,
pIter->aIdxCol[iSeq].nSpan, pIter->aIdxCol[iSeq].zSpan, zCollate
);
zType = "";
}else {
if( iCid<0 ){
/* An integer primary key. If the table has an explicit IPK, use
** its name. Otherwise, use "rbu_rowid". */
if( pIter->eType==RBU_PK_IPK ){
int i;
for(i=0; pIter->abTblPk[i]==0; i++);
assert( i<pIter->nTblCol );
zCol = pIter->azTblCol[i];
}else if( rbuIsVacuum(p) ){
zCol = "_rowid_";
}else{
zCol = "rbu_rowid";
}
zType = "INTEGER";
}else{
zCol = pIter->azTblCol[iCid];
zType = pIter->azTblType[iCid];
}
zRet = sqlite3_mprintf("%z%s\"%w\" COLLATE %Q", zRet, zCom,zCol,zCollate);
}
if( pIter->bUnique==0 || sqlite3_column_int(pXInfo, 5) ){
const char *zOrder = (bDesc ? " DESC" : "");
zImpPK = sqlite3_mprintf("%z%s\"rbu_imp_%d%w\"%s",
zImpPK, zCom, nBind, zCol, zOrder
);
}
zImpCols = sqlite3_mprintf("%z%s\"rbu_imp_%d%w\" %s COLLATE %Q",
zImpCols, zCom, nBind, zCol, zType, zCollate
);
zWhere = sqlite3_mprintf(
"%z%s\"rbu_imp_%d%w\" IS ?", zWhere, zAnd, nBind, zCol
);
if( zRet==0 || zImpPK==0 || zImpCols==0 || zWhere==0 ) rc = SQLITE_NOMEM;
zCom = ", ";
zAnd = " AND ";
nBind++;
}
rc2 = sqlite3_finalize(pXInfo);
if( rc==SQLITE_OK ) rc = rc2;
if( rc!=SQLITE_OK ){
sqlite3_free(zRet);
sqlite3_free(zImpCols);
sqlite3_free(zImpPK);
sqlite3_free(zWhere);
zRet = 0;
zImpCols = 0;
zImpPK = 0;
zWhere = 0;
p->rc = rc;
}
*pzImposterCols = zImpCols;
*pzImposterPk = zImpPK;
*pzWhere = zWhere;
*pnBind = nBind;
return zRet;
}
/*
** Assuming the current table columns are "a", "b" and "c", and the zObj
** paramter is passed "old", return a string of the form:
**
** "old.a, old.b, old.b"
**
** With the column names escaped.
**
** For tables with implicit rowids - RBU_PK_EXTERNAL and RBU_PK_NONE, append
** the text ", old._rowid_" to the returned value.
*/
static char *rbuObjIterGetOldlist(
sqlite3rbu *p,
RbuObjIter *pIter,
const char *zObj
){
char *zList = 0;
if( p->rc==SQLITE_OK && pIter->abIndexed ){
const char *zS = "";
int i;
for(i=0; i<pIter->nTblCol; i++){
if( pIter->abIndexed[i] ){
const char *zCol = pIter->azTblCol[i];
zList = sqlite3_mprintf("%z%s%s.\"%w\"", zList, zS, zObj, zCol);
}else{
zList = sqlite3_mprintf("%z%sNULL", zList, zS);
}
zS = ", ";
if( zList==0 ){
p->rc = SQLITE_NOMEM;
break;
}
}
/* For a table with implicit rowids, append "old._rowid_" to the list. */
if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
zList = rbuMPrintf(p, "%z, %s._rowid_", zList, zObj);
}
}
return zList;
}
/*
** Return an expression that can be used in a WHERE clause to match the
** primary key of the current table. For example, if the table is:
**
** CREATE TABLE t1(a, b, c, PRIMARY KEY(b, c));
**
** Return the string:
**
** "b = ?1 AND c = ?2"
*/
static char *rbuObjIterGetWhere(
sqlite3rbu *p,
RbuObjIter *pIter
){
char *zList = 0;
if( pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE ){
zList = rbuMPrintf(p, "_rowid_ = ?%d", pIter->nTblCol+1);
}else if( pIter->eType==RBU_PK_EXTERNAL ){
const char *zSep = "";
int i;
for(i=0; i<pIter->nTblCol; i++){
if( pIter->abTblPk[i] ){
zList = rbuMPrintf(p, "%z%sc%d=?%d", zList, zSep, i, i+1);
zSep = " AND ";
}
}
zList = rbuMPrintf(p,
"_rowid_ = (SELECT id FROM rbu_imposter2 WHERE %z)", zList
);
}else{
const char *zSep = "";
int i;
for(i=0; i<pIter->nTblCol; i++){
if( pIter->abTblPk[i] ){
const char *zCol = pIter->azTblCol[i];
zList = rbuMPrintf(p, "%z%s\"%w\"=?%d", zList, zSep, zCol, i+1);
zSep = " AND ";
}
}
}
return zList;
}
/*
** The SELECT statement iterating through the keys for the current object
** (p->objiter.pSelect) currently points to a valid row. However, there
** is something wrong with the rbu_control value in the rbu_control value
** stored in the (p->nCol+1)'th column. Set the error code and error message
** of the RBU handle to something reflecting this.
*/
static void rbuBadControlError(sqlite3rbu *p){
p->rc = SQLITE_ERROR;
p->zErrmsg = sqlite3_mprintf("invalid rbu_control value");
}
/*
** Return a nul-terminated string containing the comma separated list of
** assignments that should be included following the "SET" keyword of
** an UPDATE statement used to update the table object that the iterator
** passed as the second argument currently points to if the rbu_control
** column of the data_xxx table entry is set to zMask.
**
** The memory for the returned string is obtained from sqlite3_malloc().
** It is the responsibility of the caller to eventually free it using
** sqlite3_free().
**
** If an OOM error is encountered when allocating space for the new
** string, an error code is left in the rbu handle passed as the first
** argument and NULL is returned. Or, if an error has already occurred
** when this function is called, NULL is returned immediately, without
** attempting the allocation or modifying the stored error code.
*/
static char *rbuObjIterGetSetlist(
sqlite3rbu *p,
RbuObjIter *pIter,
const char *zMask
){
char *zList = 0;
if( p->rc==SQLITE_OK ){
int i;
if( (int)strlen(zMask)!=pIter->nTblCol ){
rbuBadControlError(p);
}else{
const char *zSep = "";
for(i=0; i<pIter->nTblCol; i++){
char c = zMask[pIter->aiSrcOrder[i]];
if( c=='x' ){
zList = rbuMPrintf(p, "%z%s\"%w\"=?%d",
zList, zSep, pIter->azTblCol[i], i+1
);
zSep = ", ";
}
else if( c=='d' ){
zList = rbuMPrintf(p, "%z%s\"%w\"=rbu_delta(\"%w\", ?%d)",
zList, zSep, pIter->azTblCol[i], pIter->azTblCol[i], i+1
);
zSep = ", ";
}
else if( c=='f' ){
zList = rbuMPrintf(p, "%z%s\"%w\"=rbu_fossil_delta(\"%w\", ?%d)",
zList, zSep, pIter->azTblCol[i], pIter->azTblCol[i], i+1
);
zSep = ", ";
}
}
}
}
return zList;
}
/*
** Return a nul-terminated string consisting of nByte comma separated
** "?" expressions. For example, if nByte is 3, return a pointer to
** a buffer containing the string "?,?,?".
**
** The memory for the returned string is obtained from sqlite3_malloc().
** It is the responsibility of the caller to eventually free it using
** sqlite3_free().
**
** If an OOM error is encountered when allocating space for the new
** string, an error code is left in the rbu handle passed as the first
** argument and NULL is returned. Or, if an error has already occurred
** when this function is called, NULL is returned immediately, without
** attempting the allocation or modifying the stored error code.
*/
static char *rbuObjIterGetBindlist(sqlite3rbu *p, int nBind){
char *zRet = 0;
sqlite3_int64 nByte = 2*(sqlite3_int64)nBind + 1;
zRet = (char*)rbuMalloc(p, nByte);
if( zRet ){
int i;
for(i=0; i<nBind; i++){
zRet[i*2] = '?';
zRet[i*2+1] = (i+1==nBind) ? '\0' : ',';
}
}
return zRet;
}
/*
** The iterator currently points to a table (not index) of type
** RBU_PK_WITHOUT_ROWID. This function creates the PRIMARY KEY
** declaration for the corresponding imposter table. For example,
** if the iterator points to a table created as:
**
** CREATE TABLE t1(a, b, c, PRIMARY KEY(b, a DESC)) WITHOUT ROWID
**
** this function returns:
**
** PRIMARY KEY("b", "a" DESC)
*/
static char *rbuWithoutRowidPK(sqlite3rbu *p, RbuObjIter *pIter){
char *z = 0;
assert( pIter->zIdx==0 );
if( p->rc==SQLITE_OK ){
const char *zSep = "PRIMARY KEY(";
sqlite3_stmt *pXList = 0; /* PRAGMA index_list = (pIter->zTbl) */
sqlite3_stmt *pXInfo = 0; /* PRAGMA index_xinfo = <pk-index> */
p->rc = prepareFreeAndCollectError(p->dbMain, &pXList, &p->zErrmsg,
sqlite3_mprintf("PRAGMA main.index_list = %Q", pIter->zTbl)
);
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXList) ){
const char *zOrig = (const char*)sqlite3_column_text(pXList,3);
if( zOrig && strcmp(zOrig, "pk")==0 ){
const char *zIdx = (const char*)sqlite3_column_text(pXList,1);
if( zIdx ){
p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", zIdx)
);
}
break;
}
}
rbuFinalize(p, pXList);
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
if( sqlite3_column_int(pXInfo, 5) ){
/* int iCid = sqlite3_column_int(pXInfo, 0); */
const char *zCol = (const char*)sqlite3_column_text(pXInfo, 2);
const char *zDesc = sqlite3_column_int(pXInfo, 3) ? " DESC" : "";
z = rbuMPrintf(p, "%z%s\"%w\"%s", z, zSep, zCol, zDesc);
zSep = ", ";
}
}
z = rbuMPrintf(p, "%z)", z);
rbuFinalize(p, pXInfo);
}
return z;
}
/*
** This function creates the second imposter table used when writing to
** a table b-tree where the table has an external primary key. If the
** iterator passed as the second argument does not currently point to
** a table (not index) with an external primary key, this function is a
** no-op.
**
** Assuming the iterator does point to a table with an external PK, this
** function creates a WITHOUT ROWID imposter table named "rbu_imposter2"
** used to access that PK index. For example, if the target table is
** declared as follows:
**
** CREATE TABLE t1(a, b TEXT, c REAL, PRIMARY KEY(b, c));
**
** then the imposter table schema is:
**
** CREATE TABLE rbu_imposter2(c1 TEXT, c2 REAL, id INTEGER) WITHOUT ROWID;
**
*/
static void rbuCreateImposterTable2(sqlite3rbu *p, RbuObjIter *pIter){
if( p->rc==SQLITE_OK && pIter->eType==RBU_PK_EXTERNAL ){
int tnum = pIter->iPkTnum; /* Root page of PK index */
sqlite3_stmt *pQuery = 0; /* SELECT name ... WHERE rootpage = $tnum */
const char *zIdx = 0; /* Name of PK index */
sqlite3_stmt *pXInfo = 0; /* PRAGMA main.index_xinfo = $zIdx */
const char *zComma = "";
char *zCols = 0; /* Used to build up list of table cols */
char *zPk = 0; /* Used to build up table PK declaration */
/* Figure out the name of the primary key index for the current table.
** This is needed for the argument to "PRAGMA index_xinfo". Set
** zIdx to point to a nul-terminated string containing this name. */
p->rc = prepareAndCollectError(p->dbMain, &pQuery, &p->zErrmsg,
"SELECT name FROM sqlite_schema WHERE rootpage = ?"
);
if( p->rc==SQLITE_OK ){
sqlite3_bind_int(pQuery, 1, tnum);
if( SQLITE_ROW==sqlite3_step(pQuery) ){
zIdx = (const char*)sqlite3_column_text(pQuery, 0);
}
}
if( zIdx ){
p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", zIdx)
);
}
rbuFinalize(p, pQuery);
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
int bKey = sqlite3_column_int(pXInfo, 5);
if( bKey ){
int iCid = sqlite3_column_int(pXInfo, 1);
int bDesc = sqlite3_column_int(pXInfo, 3);
const char *zCollate = (const char*)sqlite3_column_text(pXInfo, 4);
zCols = rbuMPrintf(p, "%z%sc%d %s COLLATE %Q", zCols, zComma,
iCid, pIter->azTblType[iCid], zCollate
);
zPk = rbuMPrintf(p, "%z%sc%d%s", zPk, zComma, iCid, bDesc?" DESC":"");
zComma = ", ";
}
}
zCols = rbuMPrintf(p, "%z, id INTEGER", zCols);
rbuFinalize(p, pXInfo);
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 1, tnum);
rbuMPrintfExec(p, p->dbMain,
"CREATE TABLE rbu_imposter2(%z, PRIMARY KEY(%z)) WITHOUT ROWID",
zCols, zPk
);
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 0);
}
}
/*
** If an error has already occurred when this function is called, it
** immediately returns zero (without doing any work). Or, if an error
** occurs during the execution of this function, it sets the error code
** in the sqlite3rbu object indicated by the first argument and returns
** zero.
**
** The iterator passed as the second argument is guaranteed to point to
** a table (not an index) when this function is called. This function
** attempts to create any imposter table required to write to the main
** table b-tree of the table before returning. Non-zero is returned if
** an imposter table are created, or zero otherwise.
**
** An imposter table is required in all cases except RBU_PK_VTAB. Only
** virtual tables are written to directly. The imposter table has the
** same schema as the actual target table (less any UNIQUE constraints).
** More precisely, the "same schema" means the same columns, types,
** collation sequences. For tables that do not have an external PRIMARY
** KEY, it also means the same PRIMARY KEY declaration.
*/
static void rbuCreateImposterTable(sqlite3rbu *p, RbuObjIter *pIter){
if( p->rc==SQLITE_OK && pIter->eType!=RBU_PK_VTAB ){
int tnum = pIter->iTnum;
const char *zComma = "";
char *zSql = 0;
int iCol;
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 1);
for(iCol=0; p->rc==SQLITE_OK && iCol<pIter->nTblCol; iCol++){
const char *zPk = "";
const char *zCol = pIter->azTblCol[iCol];
const char *zColl = 0;
p->rc = sqlite3_table_column_metadata(
p->dbMain, "main", pIter->zTbl, zCol, 0, &zColl, 0, 0, 0
);
if( pIter->eType==RBU_PK_IPK && pIter->abTblPk[iCol] ){
/* If the target table column is an "INTEGER PRIMARY KEY", add
** "PRIMARY KEY" to the imposter table column declaration. */
zPk = "PRIMARY KEY ";
}
zSql = rbuMPrintf(p, "%z%s\"%w\" %s %sCOLLATE %Q%s",
zSql, zComma, zCol, pIter->azTblType[iCol], zPk, zColl,
(pIter->abNotNull[iCol] ? " NOT NULL" : "")
);
zComma = ", ";
}
if( pIter->eType==RBU_PK_WITHOUT_ROWID ){
char *zPk = rbuWithoutRowidPK(p, pIter);
if( zPk ){
zSql = rbuMPrintf(p, "%z, %z", zSql, zPk);
}
}
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 1, tnum);
rbuMPrintfExec(p, p->dbMain, "CREATE TABLE \"rbu_imp_%w\"(%z)%s",
pIter->zTbl, zSql,
(pIter->eType==RBU_PK_WITHOUT_ROWID ? " WITHOUT ROWID" : "")
);
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 0);
}
}
/*
** Prepare a statement used to insert rows into the "rbu_tmp_xxx" table.
** Specifically a statement of the form:
**
** INSERT INTO rbu_tmp_xxx VALUES(?, ?, ? ...);
**
** The number of bound variables is equal to the number of columns in
** the target table, plus one (for the rbu_control column), plus one more
** (for the rbu_rowid column) if the target table is an implicit IPK or
** virtual table.
*/
static void rbuObjIterPrepareTmpInsert(
sqlite3rbu *p,
RbuObjIter *pIter,
const char *zCollist,
const char *zRbuRowid
){
int bRbuRowid = (pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE);
char *zBind = rbuObjIterGetBindlist(p, pIter->nTblCol + 1 + bRbuRowid);
if( zBind ){
assert( pIter->pTmpInsert==0 );
p->rc = prepareFreeAndCollectError(
p->dbRbu, &pIter->pTmpInsert, &p->zErrmsg, sqlite3_mprintf(
"INSERT INTO %s.'rbu_tmp_%q'(rbu_control,%s%s) VALUES(%z)",
p->zStateDb, pIter->zDataTbl, zCollist, zRbuRowid, zBind
));
}
}
static void rbuTmpInsertFunc(
sqlite3_context *pCtx,
int nVal,
sqlite3_value **apVal
){
sqlite3rbu *p = sqlite3_user_data(pCtx);
int rc = SQLITE_OK;
int i;
assert( sqlite3_value_int(apVal[0])!=0
|| p->objiter.eType==RBU_PK_EXTERNAL
|| p->objiter.eType==RBU_PK_NONE
);
if( sqlite3_value_int(apVal[0])!=0 ){
p->nPhaseOneStep += p->objiter.nIndex;
}
for(i=0; rc==SQLITE_OK && i<nVal; i++){
rc = sqlite3_bind_value(p->objiter.pTmpInsert, i+1, apVal[i]);
}
if( rc==SQLITE_OK ){
sqlite3_step(p->objiter.pTmpInsert);
rc = sqlite3_reset(p->objiter.pTmpInsert);
}
if( rc!=SQLITE_OK ){
sqlite3_result_error_code(pCtx, rc);
}
}
static char *rbuObjIterGetIndexWhere(sqlite3rbu *p, RbuObjIter *pIter){
sqlite3_stmt *pStmt = 0;
int rc = p->rc;
char *zRet = 0;
assert( pIter->zIdxSql==0 && pIter->nIdxCol==0 && pIter->aIdxCol==0 );
if( rc==SQLITE_OK ){
rc = prepareAndCollectError(p->dbMain, &pStmt, &p->zErrmsg,
"SELECT trim(sql) FROM sqlite_schema WHERE type='index' AND name=?"
);
}
if( rc==SQLITE_OK ){
int rc2;
rc = sqlite3_bind_text(pStmt, 1, pIter->zIdx, -1, SQLITE_STATIC);
if( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
char *zSql = (char*)sqlite3_column_text(pStmt, 0);
if( zSql ){
pIter->zIdxSql = zSql = rbuStrndup(zSql, &rc);
}
if( zSql ){
int nParen = 0; /* Number of open parenthesis */
int i;
int iIdxCol = 0;
int nIdxAlloc = 0;
for(i=0; zSql[i]; i++){
char c = zSql[i];
/* If necessary, grow the pIter->aIdxCol[] array */
if( iIdxCol==nIdxAlloc ){
RbuSpan *aIdxCol = (RbuSpan*)sqlite3_realloc(
pIter->aIdxCol, (nIdxAlloc+16)*sizeof(RbuSpan)
);
if( aIdxCol==0 ){
rc = SQLITE_NOMEM;
break;
}
pIter->aIdxCol = aIdxCol;
nIdxAlloc += 16;
}
if( c=='(' ){
if( nParen==0 ){
assert( iIdxCol==0 );
pIter->aIdxCol[0].zSpan = &zSql[i+1];
}
nParen++;
}
else if( c==')' ){
nParen--;
if( nParen==0 ){
int nSpan = &zSql[i] - pIter->aIdxCol[iIdxCol].zSpan;
pIter->aIdxCol[iIdxCol++].nSpan = nSpan;
i++;
break;
}
}else if( c==',' && nParen==1 ){
int nSpan = &zSql[i] - pIter->aIdxCol[iIdxCol].zSpan;
pIter->aIdxCol[iIdxCol++].nSpan = nSpan;
pIter->aIdxCol[iIdxCol].zSpan = &zSql[i+1];
}else if( c=='"' || c=='\'' || c=='`' ){
for(i++; 1; i++){
if( zSql[i]==c ){
if( zSql[i+1]!=c ) break;
i++;
}
}
}else if( c=='[' ){
for(i++; 1; i++){
if( zSql[i]==']' ) break;
}
}else if( c=='-' && zSql[i+1]=='-' ){
for(i=i+2; zSql[i] && zSql[i]!='\n'; i++);
if( zSql[i]=='\0' ) break;
}else if( c=='/' && zSql[i+1]=='*' ){
for(i=i+2; zSql[i] && (zSql[i]!='*' || zSql[i+1]!='/'); i++);
if( zSql[i]=='\0' ) break;
i++;
}
}
if( zSql[i] ){
zRet = rbuStrndup(&zSql[i], &rc);
}
pIter->nIdxCol = iIdxCol;
}
}
rc2 = sqlite3_finalize(pStmt);
if( rc==SQLITE_OK ) rc = rc2;
}
p->rc = rc;
return zRet;
}
/*
** Ensure that the SQLite statement handles required to update the
** target database object currently indicated by the iterator passed
** as the second argument are available.
*/
static int rbuObjIterPrepareAll(
sqlite3rbu *p,
RbuObjIter *pIter,
int nOffset /* Add "LIMIT -1 OFFSET $nOffset" to SELECT */
){
assert( pIter->bCleanup==0 );
if( pIter->pSelect==0 && rbuObjIterCacheTableInfo(p, pIter)==SQLITE_OK ){
const int tnum = pIter->iTnum;
char *zCollist = 0; /* List of indexed columns */
char **pz = &p->zErrmsg;
const char *zIdx = pIter->zIdx;
char *zLimit = 0;
if( nOffset ){
zLimit = sqlite3_mprintf(" LIMIT -1 OFFSET %d", nOffset);
if( !zLimit ) p->rc = SQLITE_NOMEM;
}
if( zIdx ){
const char *zTbl = pIter->zTbl;
char *zImposterCols = 0; /* Columns for imposter table */
char *zImposterPK = 0; /* Primary key declaration for imposter */
char *zWhere = 0; /* WHERE clause on PK columns */
char *zBind = 0;
char *zPart = 0;
int nBind = 0;
assert( pIter->eType!=RBU_PK_VTAB );
zPart = rbuObjIterGetIndexWhere(p, pIter);
zCollist = rbuObjIterGetIndexCols(
p, pIter, &zImposterCols, &zImposterPK, &zWhere, &nBind
);
zBind = rbuObjIterGetBindlist(p, nBind);
/* Create the imposter table used to write to this index. */
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 1);
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 1,tnum);
rbuMPrintfExec(p, p->dbMain,
"CREATE TABLE \"rbu_imp_%w\"( %s, PRIMARY KEY( %s ) ) WITHOUT ROWID",
zTbl, zImposterCols, zImposterPK
);
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 0);
/* Create the statement to insert index entries */
pIter->nCol = nBind;
if( p->rc==SQLITE_OK ){
p->rc = prepareFreeAndCollectError(
p->dbMain, &pIter->pInsert, &p->zErrmsg,
sqlite3_mprintf("INSERT INTO \"rbu_imp_%w\" VALUES(%s)", zTbl, zBind)
);
}
/* And to delete index entries */
if( rbuIsVacuum(p)==0 && p->rc==SQLITE_OK ){
p->rc = prepareFreeAndCollectError(
p->dbMain, &pIter->pDelete, &p->zErrmsg,
sqlite3_mprintf("DELETE FROM \"rbu_imp_%w\" WHERE %s", zTbl, zWhere)
);
}
/* Create the SELECT statement to read keys in sorted order */
if( p->rc==SQLITE_OK ){
char *zSql;
if( rbuIsVacuum(p) ){
char *zStart = 0;
if( nOffset ){
zStart = rbuVacuumIndexStart(p, pIter);
if( zStart ){
sqlite3_free(zLimit);
zLimit = 0;
}
}
zSql = sqlite3_mprintf(
"SELECT %s, 0 AS rbu_control FROM '%q' %s %s %s ORDER BY %s%s",
zCollist,
pIter->zDataTbl,
zPart,
(zStart ? (zPart ? "AND" : "WHERE") : ""), zStart,
zCollist, zLimit
);
sqlite3_free(zStart);
}else
if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
zSql = sqlite3_mprintf(
"SELECT %s, rbu_control FROM %s.'rbu_tmp_%q' %s ORDER BY %s%s",
zCollist, p->zStateDb, pIter->zDataTbl,
zPart, zCollist, zLimit
);
}else{
zSql = sqlite3_mprintf(
"SELECT %s, rbu_control FROM %s.'rbu_tmp_%q' %s "
"UNION ALL "
"SELECT %s, rbu_control FROM '%q' "
"%s %s typeof(rbu_control)='integer' AND rbu_control!=1 "
"ORDER BY %s%s",
zCollist, p->zStateDb, pIter->zDataTbl, zPart,
zCollist, pIter->zDataTbl,
zPart,
(zPart ? "AND" : "WHERE"),
zCollist, zLimit
);
}
if( p->rc==SQLITE_OK ){
p->rc = prepareFreeAndCollectError(p->dbRbu,&pIter->pSelect,pz,zSql);
}else{
sqlite3_free(zSql);
}
}
sqlite3_free(zImposterCols);
sqlite3_free(zImposterPK);
sqlite3_free(zWhere);
sqlite3_free(zBind);
sqlite3_free(zPart);
}else{
int bRbuRowid = (pIter->eType==RBU_PK_VTAB)
||(pIter->eType==RBU_PK_NONE)
||(pIter->eType==RBU_PK_EXTERNAL && rbuIsVacuum(p));
const char *zTbl = pIter->zTbl; /* Table this step applies to */
const char *zWrite; /* Imposter table name */
char *zBindings = rbuObjIterGetBindlist(p, pIter->nTblCol + bRbuRowid);
char *zWhere = rbuObjIterGetWhere(p, pIter);
char *zOldlist = rbuObjIterGetOldlist(p, pIter, "old");
char *zNewlist = rbuObjIterGetOldlist(p, pIter, "new");
zCollist = rbuObjIterGetCollist(p, pIter);
pIter->nCol = pIter->nTblCol;
/* Create the imposter table or tables (if required). */
rbuCreateImposterTable(p, pIter);
rbuCreateImposterTable2(p, pIter);
zWrite = (pIter->eType==RBU_PK_VTAB ? "" : "rbu_imp_");
/* Create the INSERT statement to write to the target PK b-tree */
if( p->rc==SQLITE_OK ){
p->rc = prepareFreeAndCollectError(p->dbMain, &pIter->pInsert, pz,
sqlite3_mprintf(
"INSERT INTO \"%s%w\"(%s%s) VALUES(%s)",
zWrite, zTbl, zCollist, (bRbuRowid ? ", _rowid_" : ""), zBindings
)
);
}
/* Create the DELETE statement to write to the target PK b-tree.
** Because it only performs INSERT operations, this is not required for
** an rbu vacuum handle. */
if( rbuIsVacuum(p)==0 && p->rc==SQLITE_OK ){
p->rc = prepareFreeAndCollectError(p->dbMain, &pIter->pDelete, pz,
sqlite3_mprintf(
"DELETE FROM \"%s%w\" WHERE %s", zWrite, zTbl, zWhere
)
);
}
if( rbuIsVacuum(p)==0 && pIter->abIndexed ){
const char *zRbuRowid = "";
if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
zRbuRowid = ", rbu_rowid";
}
/* Create the rbu_tmp_xxx table and the triggers to populate it. */
rbuMPrintfExec(p, p->dbRbu,
"CREATE TABLE IF NOT EXISTS %s.'rbu_tmp_%q' AS "
"SELECT *%s FROM '%q' WHERE 0;"
, p->zStateDb, pIter->zDataTbl
, (pIter->eType==RBU_PK_EXTERNAL ? ", 0 AS rbu_rowid" : "")
, pIter->zDataTbl
);
rbuMPrintfExec(p, p->dbMain,
"CREATE TEMP TRIGGER rbu_delete_tr BEFORE DELETE ON \"%s%w\" "
"BEGIN "
" SELECT rbu_tmp_insert(3, %s);"
"END;"
"CREATE TEMP TRIGGER rbu_update1_tr BEFORE UPDATE ON \"%s%w\" "
"BEGIN "
" SELECT rbu_tmp_insert(3, %s);"
"END;"
"CREATE TEMP TRIGGER rbu_update2_tr AFTER UPDATE ON \"%s%w\" "
"BEGIN "
" SELECT rbu_tmp_insert(4, %s);"
"END;",
zWrite, zTbl, zOldlist,
zWrite, zTbl, zOldlist,
zWrite, zTbl, zNewlist
);
if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
rbuMPrintfExec(p, p->dbMain,
"CREATE TEMP TRIGGER rbu_insert_tr AFTER INSERT ON \"%s%w\" "
"BEGIN "
" SELECT rbu_tmp_insert(0, %s);"
"END;",
zWrite, zTbl, zNewlist
);
}
rbuObjIterPrepareTmpInsert(p, pIter, zCollist, zRbuRowid);
}
/* Create the SELECT statement to read keys from data_xxx */
if( p->rc==SQLITE_OK ){
const char *zRbuRowid = "";
char *zStart = 0;
char *zOrder = 0;
if( bRbuRowid ){
zRbuRowid = rbuIsVacuum(p) ? ",_rowid_ " : ",rbu_rowid";
}
if( rbuIsVacuum(p) ){
if( nOffset ){
zStart = rbuVacuumTableStart(p, pIter, bRbuRowid, zWrite);
if( zStart ){
sqlite3_free(zLimit);
zLimit = 0;
}
}
if( bRbuRowid ){
zOrder = rbuMPrintf(p, "_rowid_");
}else{
zOrder = rbuObjIterGetPkList(p, pIter, "", ", ", "");
}
}
if( p->rc==SQLITE_OK ){
p->rc = prepareFreeAndCollectError(p->dbRbu, &pIter->pSelect, pz,
sqlite3_mprintf(
"SELECT %s,%s rbu_control%s FROM '%q'%s %s %s %s",
zCollist,
(rbuIsVacuum(p) ? "0 AS " : ""),
zRbuRowid,
pIter->zDataTbl, (zStart ? zStart : ""),
(zOrder ? "ORDER BY" : ""), zOrder,
zLimit
)
);
}
sqlite3_free(zStart);
sqlite3_free(zOrder);
}
sqlite3_free(zWhere);
sqlite3_free(zOldlist);
sqlite3_free(zNewlist);
sqlite3_free(zBindings);
}
sqlite3_free(zCollist);
sqlite3_free(zLimit);
}
return p->rc;
}
/*
** Set output variable *ppStmt to point to an UPDATE statement that may
** be used to update the imposter table for the main table b-tree of the
** table object that pIter currently points to, assuming that the
** rbu_control column of the data_xyz table contains zMask.
**
** If the zMask string does not specify any columns to update, then this
** is not an error. Output variable *ppStmt is set to NULL in this case.
*/
static int rbuGetUpdateStmt(
sqlite3rbu *p, /* RBU handle */
RbuObjIter *pIter, /* Object iterator */
const char *zMask, /* rbu_control value ('x.x.') */
sqlite3_stmt **ppStmt /* OUT: UPDATE statement handle */
){
RbuUpdateStmt **pp;
RbuUpdateStmt *pUp = 0;
int nUp = 0;
/* In case an error occurs */
*ppStmt = 0;
/* Search for an existing statement. If one is found, shift it to the front
** of the LRU queue and return immediately. Otherwise, leave nUp pointing
** to the number of statements currently in the cache and pUp to the
** last object in the list. */
for(pp=&pIter->pRbuUpdate; *pp; pp=&((*pp)->pNext)){
pUp = *pp;
if( strcmp(pUp->zMask, zMask)==0 ){
*pp = pUp->pNext;
pUp->pNext = pIter->pRbuUpdate;
pIter->pRbuUpdate = pUp;
*ppStmt = pUp->pUpdate;
return SQLITE_OK;
}
nUp++;
}
assert( pUp==0 || pUp->pNext==0 );
if( nUp>=SQLITE_RBU_UPDATE_CACHESIZE ){
for(pp=&pIter->pRbuUpdate; *pp!=pUp; pp=&((*pp)->pNext));
*pp = 0;
sqlite3_finalize(pUp->pUpdate);
pUp->pUpdate = 0;
}else{
pUp = (RbuUpdateStmt*)rbuMalloc(p, sizeof(RbuUpdateStmt)+pIter->nTblCol+1);
}
if( pUp ){
char *zWhere = rbuObjIterGetWhere(p, pIter);
char *zSet = rbuObjIterGetSetlist(p, pIter, zMask);
char *zUpdate = 0;
pUp->zMask = (char*)&pUp[1];
memcpy(pUp->zMask, zMask, pIter->nTblCol);
pUp->pNext = pIter->pRbuUpdate;
pIter->pRbuUpdate = pUp;
if( zSet ){
const char *zPrefix = "";
if( pIter->eType!=RBU_PK_VTAB ) zPrefix = "rbu_imp_";
zUpdate = sqlite3_mprintf("UPDATE \"%s%w\" SET %s WHERE %s",
zPrefix, pIter->zTbl, zSet, zWhere
);
p->rc = prepareFreeAndCollectError(
p->dbMain, &pUp->pUpdate, &p->zErrmsg, zUpdate
);
*ppStmt = pUp->pUpdate;
}
sqlite3_free(zWhere);
sqlite3_free(zSet);
}
return p->rc;
}
static sqlite3 *rbuOpenDbhandle(
sqlite3rbu *p,
const char *zName,
int bUseVfs
){
sqlite3 *db = 0;
if( p->rc==SQLITE_OK ){
const int flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|SQLITE_OPEN_URI;
p->rc = sqlite3_open_v2(zName, &db, flags, bUseVfs ? p->zVfsName : 0);
if( p->rc ){
p->zErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
sqlite3_close(db);
db = 0;
}
}
return db;
}
/*
** Free an RbuState object allocated by rbuLoadState().
*/
static void rbuFreeState(RbuState *p){
if( p ){
sqlite3_free(p->zTbl);
sqlite3_free(p->zDataTbl);
sqlite3_free(p->zIdx);
sqlite3_free(p);
}
}
/*
** Allocate an RbuState object and load the contents of the rbu_state
** table into it. Return a pointer to the new object. It is the
** responsibility of the caller to eventually free the object using
** sqlite3_free().
**
** If an error occurs, leave an error code and message in the rbu handle
** and return NULL.
*/
static RbuState *rbuLoadState(sqlite3rbu *p){
RbuState *pRet = 0;
sqlite3_stmt *pStmt = 0;
int rc;
int rc2;
pRet = (RbuState*)rbuMalloc(p, sizeof(RbuState));
if( pRet==0 ) return 0;
rc = prepareFreeAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
sqlite3_mprintf("SELECT k, v FROM %s.rbu_state", p->zStateDb)
);
while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
switch( sqlite3_column_int(pStmt, 0) ){
case RBU_STATE_STAGE:
pRet->eStage = sqlite3_column_int(pStmt, 1);
if( pRet->eStage!=RBU_STAGE_OAL
&& pRet->eStage!=RBU_STAGE_MOVE
&& pRet->eStage!=RBU_STAGE_CKPT
){
p->rc = SQLITE_CORRUPT;
}
break;
case RBU_STATE_TBL:
pRet->zTbl = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
break;
case RBU_STATE_IDX:
pRet->zIdx = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
break;
case RBU_STATE_ROW:
pRet->nRow = sqlite3_column_int(pStmt, 1);
break;
case RBU_STATE_PROGRESS:
pRet->nProgress = sqlite3_column_int64(pStmt, 1);
break;
case RBU_STATE_CKPT:
pRet->iWalCksum = sqlite3_column_int64(pStmt, 1);
break;
case RBU_STATE_COOKIE:
pRet->iCookie = (u32)sqlite3_column_int64(pStmt, 1);
break;
case RBU_STATE_OALSZ:
pRet->iOalSz = sqlite3_column_int64(pStmt, 1);
break;
case RBU_STATE_PHASEONESTEP:
pRet->nPhaseOneStep = sqlite3_column_int64(pStmt, 1);
break;
case RBU_STATE_DATATBL:
pRet->zDataTbl = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
break;
default:
rc = SQLITE_CORRUPT;
break;
}
}
rc2 = sqlite3_finalize(pStmt);
if( rc==SQLITE_OK ) rc = rc2;
p->rc = rc;
return pRet;
}
/*
** Open the database handle and attach the RBU database as "rbu". If an
** error occurs, leave an error code and message in the RBU handle.
**
** If argument dbMain is not NULL, then it is a database handle already
** open on the target database. Use this handle instead of opening a new
** one.
*/
static void rbuOpenDatabase(sqlite3rbu *p, sqlite3 *dbMain, int *pbRetry){
assert( p->rc || (p->dbMain==0 && p->dbRbu==0) );
assert( p->rc || rbuIsVacuum(p) || p->zTarget!=0 );
assert( dbMain==0 || rbuIsVacuum(p)==0 );
/* Open the RBU database */
p->dbRbu = rbuOpenDbhandle(p, p->zRbu, 1);
p->dbMain = dbMain;
if( p->rc==SQLITE_OK && rbuIsVacuum(p) ){
sqlite3_file_control(p->dbRbu, "main", SQLITE_FCNTL_RBUCNT, (void*)p);
if( p->zState==0 ){
const char *zFile = sqlite3_db_filename(p->dbRbu, "main");
p->zState = rbuMPrintf(p, "file:///%s-vacuum?modeof=%s", zFile, zFile);
}
}
/* If using separate RBU and state databases, attach the state database to
** the RBU db handle now. */
if( p->zState ){
rbuMPrintfExec(p, p->dbRbu, "ATTACH %Q AS stat", p->zState);
memcpy(p->zStateDb, "stat", 4);
}else{
memcpy(p->zStateDb, "main", 4);
}
#if 0
if( p->rc==SQLITE_OK && rbuIsVacuum(p) ){
p->rc = sqlite3_exec(p->dbRbu, "BEGIN", 0, 0, 0);
}
#endif
/* If it has not already been created, create the rbu_state table */
rbuMPrintfExec(p, p->dbRbu, RBU_CREATE_STATE, p->zStateDb);
#if 0
if( rbuIsVacuum(p) ){
if( p->rc==SQLITE_OK ){
int rc2;
int bOk = 0;
sqlite3_stmt *pCnt = 0;
p->rc = prepareAndCollectError(p->dbRbu, &pCnt, &p->zErrmsg,
"SELECT count(*) FROM stat.sqlite_schema"
);
if( p->rc==SQLITE_OK
&& sqlite3_step(pCnt)==SQLITE_ROW
&& 1==sqlite3_column_int(pCnt, 0)
){
bOk = 1;
}
rc2 = sqlite3_finalize(pCnt);
if( p->rc==SQLITE_OK ) p->rc = rc2;
if( p->rc==SQLITE_OK && bOk==0 ){
p->rc = SQLITE_ERROR;
p->zErrmsg = sqlite3_mprintf("invalid state database");
}
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, 0);
}
}
}
#endif
if( p->rc==SQLITE_OK && rbuIsVacuum(p) ){
int bOpen = 0;
int rc;
p->nRbu = 0;
p->pRbuFd = 0;
rc = sqlite3_file_control(p->dbRbu, "main", SQLITE_FCNTL_RBUCNT, (void*)p);
if( rc!=SQLITE_NOTFOUND ) p->rc = rc;
if( p->eStage>=RBU_STAGE_MOVE ){
bOpen = 1;
}else{
RbuState *pState = rbuLoadState(p);
if( pState ){
bOpen = (pState->eStage>=RBU_STAGE_MOVE);
rbuFreeState(pState);
}
}
if( bOpen ) p->dbMain = rbuOpenDbhandle(p, p->zRbu, p->nRbu<=1);
}
p->eStage = 0;
if( p->rc==SQLITE_OK && p->dbMain==0 ){
if( !rbuIsVacuum(p) ){
p->dbMain = rbuOpenDbhandle(p, p->zTarget, 1);
}else if( p->pRbuFd->pWalFd ){
if( pbRetry ){
p->pRbuFd->bNolock = 0;
sqlite3_close(p->dbRbu);
sqlite3_close(p->dbMain);
p->dbMain = 0;
p->dbRbu = 0;
*pbRetry = 1;
return;
}
p->rc = SQLITE_ERROR;
p->zErrmsg = sqlite3_mprintf("cannot vacuum wal mode database");
}else{
char *zTarget;
char *zExtra = 0;
if( strlen(p->zRbu)>=5 && 0==memcmp("file:", p->zRbu, 5) ){
zExtra = &p->zRbu[5];
while( *zExtra ){
if( *zExtra++=='?' ) break;
}
if( *zExtra=='\0' ) zExtra = 0;
}
zTarget = sqlite3_mprintf("file:%s-vactmp?rbu_memory=1%s%s",
sqlite3_db_filename(p->dbRbu, "main"),
(zExtra==0 ? "" : "&"), (zExtra==0 ? "" : zExtra)
);
if( zTarget==0 ){
p->rc = SQLITE_NOMEM;
return;
}
p->dbMain = rbuOpenDbhandle(p, zTarget, p->nRbu<=1);
sqlite3_free(zTarget);
}
}
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_create_function(p->dbMain,
"rbu_tmp_insert", -1, SQLITE_UTF8, (void*)p, rbuTmpInsertFunc, 0, 0
);
}
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_create_function(p->dbMain,
"rbu_fossil_delta", 2, SQLITE_UTF8, 0, rbuFossilDeltaFunc, 0, 0
);
}
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_create_function(p->dbRbu,
"rbu_target_name", -1, SQLITE_UTF8, (void*)p, rbuTargetNameFunc, 0, 0
);
}
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_file_control(p->dbMain, "main", SQLITE_FCNTL_RBU, (void*)p);
}
rbuMPrintfExec(p, p->dbMain, "SELECT * FROM sqlite_schema");
/* Mark the database file just opened as an RBU target database. If
** this call returns SQLITE_NOTFOUND, then the RBU vfs is not in use.
** This is an error. */
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_file_control(p->dbMain, "main", SQLITE_FCNTL_RBU, (void*)p);
}
if( p->rc==SQLITE_NOTFOUND ){
p->rc = SQLITE_ERROR;
p->zErrmsg = sqlite3_mprintf("rbu vfs not found");
}
}
/*
** This routine is a copy of the sqlite3FileSuffix3() routine from the core.
** It is a no-op unless SQLITE_ENABLE_8_3_NAMES is defined.
**
** If SQLITE_ENABLE_8_3_NAMES is set at compile-time and if the database
** filename in zBaseFilename is a URI with the "8_3_names=1" parameter and
** if filename in z[] has a suffix (a.k.a. "extension") that is longer than
** three characters, then shorten the suffix on z[] to be the last three
** characters of the original suffix.
**
** If SQLITE_ENABLE_8_3_NAMES is set to 2 at compile-time, then always
** do the suffix shortening regardless of URI parameter.
**
** Examples:
**
** test.db-journal => test.nal
** test.db-wal => test.wal
** test.db-shm => test.shm
** test.db-mj7f3319fa => test.9fa
*/
static void rbuFileSuffix3(const char *zBase, char *z){
#ifdef SQLITE_ENABLE_8_3_NAMES
#if SQLITE_ENABLE_8_3_NAMES<2
if( sqlite3_uri_boolean(zBase, "8_3_names", 0) )
#endif
{
int i, sz;
sz = (int)strlen(z)&0xffffff;
for(i=sz-1; i>0 && z[i]!='/' && z[i]!='.'; i--){}
if( z[i]=='.' && sz>i+4 ) memmove(&z[i+1], &z[sz-3], 4);
}
#endif
}
/*
** Return the current wal-index header checksum for the target database
** as a 64-bit integer.
**
** The checksum is store in the first page of xShmMap memory as an 8-byte
** blob starting at byte offset 40.
*/
static i64 rbuShmChecksum(sqlite3rbu *p){
i64 iRet = 0;
if( p->rc==SQLITE_OK ){
sqlite3_file *pDb = p->pTargetFd->pReal;
u32 volatile *ptr;
p->rc = pDb->pMethods->xShmMap(pDb, 0, 32*1024, 0, (void volatile**)&ptr);
if( p->rc==SQLITE_OK ){
iRet = ((i64)ptr[10] << 32) + ptr[11];
}
}
return iRet;
}
/*
** This function is called as part of initializing or reinitializing an
** incremental checkpoint.
**
** It populates the sqlite3rbu.aFrame[] array with the set of
** (wal frame -> db page) copy operations required to checkpoint the
** current wal file, and obtains the set of shm locks required to safely
** perform the copy operations directly on the file-system.
**
** If argument pState is not NULL, then the incremental checkpoint is
** being resumed. In this case, if the checksum of the wal-index-header
** following recovery is not the same as the checksum saved in the RbuState
** object, then the rbu handle is set to DONE state. This occurs if some
** other client appends a transaction to the wal file in the middle of
** an incremental checkpoint.
*/
static void rbuSetupCheckpoint(sqlite3rbu *p, RbuState *pState){
/* If pState is NULL, then the wal file may not have been opened and
** recovered. Running a read-statement here to ensure that doing so
** does not interfere with the "capture" process below. */
if( pState==0 ){
p->eStage = 0;
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_exec(p->dbMain, "SELECT * FROM sqlite_schema", 0, 0, 0);
}
}
/* Assuming no error has occurred, run a "restart" checkpoint with the
** sqlite3rbu.eStage variable set to CAPTURE. This turns on the following
** special behaviour in the rbu VFS:
**
** * If the exclusive shm WRITER or READ0 lock cannot be obtained,
** the checkpoint fails with SQLITE_BUSY (normally SQLite would
** proceed with running a passive checkpoint instead of failing).
**
** * Attempts to read from the *-wal file or write to the database file
** do not perform any IO. Instead, the frame/page combinations that
** would be read/written are recorded in the sqlite3rbu.aFrame[]
** array.
**
** * Calls to xShmLock(UNLOCK) to release the exclusive shm WRITER,
** READ0 and CHECKPOINT locks taken as part of the checkpoint are
** no-ops. These locks will not be released until the connection
** is closed.
**
** * Attempting to xSync() the database file causes an SQLITE_INTERNAL
** error.
**
** As a result, unless an error (i.e. OOM or SQLITE_BUSY) occurs, the
** checkpoint below fails with SQLITE_INTERNAL, and leaves the aFrame[]
** array populated with a set of (frame -> page) mappings. Because the
** WRITER, CHECKPOINT and READ0 locks are still held, it is safe to copy
** data from the wal file into the database file according to the
** contents of aFrame[].
*/
if( p->rc==SQLITE_OK ){
int rc2;
p->eStage = RBU_STAGE_CAPTURE;
rc2 = sqlite3_exec(p->dbMain, "PRAGMA main.wal_checkpoint=restart", 0, 0,0);
if( rc2!=SQLITE_INTERNAL ) p->rc = rc2;
}
if( p->rc==SQLITE_OK && p->nFrame>0 ){
p->eStage = RBU_STAGE_CKPT;
p->nStep = (pState ? pState->nRow : 0);
p->aBuf = rbuMalloc(p, p->pgsz);
p->iWalCksum = rbuShmChecksum(p);
}
if( p->rc==SQLITE_OK ){
if( p->nFrame==0 || (pState && pState->iWalCksum!=p->iWalCksum) ){
p->rc = SQLITE_DONE;
p->eStage = RBU_STAGE_DONE;
}else{
int nSectorSize;
sqlite3_file *pDb = p->pTargetFd->pReal;
sqlite3_file *pWal = p->pTargetFd->pWalFd->pReal;
assert( p->nPagePerSector==0 );
nSectorSize = pDb->pMethods->xSectorSize(pDb);
if( nSectorSize>p->pgsz ){
p->nPagePerSector = nSectorSize / p->pgsz;
}else{
p->nPagePerSector = 1;
}
/* Call xSync() on the wal file. This causes SQLite to sync the
** directory in which the target database and the wal file reside, in
** case it has not been synced since the rename() call in
** rbuMoveOalFile(). */
p->rc = pWal->pMethods->xSync(pWal, SQLITE_SYNC_NORMAL);
}
}
}
/*
** Called when iAmt bytes are read from offset iOff of the wal file while
** the rbu object is in capture mode. Record the frame number of the frame
** being read in the aFrame[] array.
*/
static int rbuCaptureWalRead(sqlite3rbu *pRbu, i64 iOff, int iAmt){
const u32 mReq = (1<<WAL_LOCK_WRITE)|(1<<WAL_LOCK_CKPT)|(1<<WAL_LOCK_READ0);
u32 iFrame;
if( pRbu->mLock!=mReq ){
pRbu->rc = SQLITE_BUSY;
return SQLITE_INTERNAL;
}
pRbu->pgsz = iAmt;
if( pRbu->nFrame==pRbu->nFrameAlloc ){
int nNew = (pRbu->nFrameAlloc ? pRbu->nFrameAlloc : 64) * 2;
RbuFrame *aNew;
aNew = (RbuFrame*)sqlite3_realloc64(pRbu->aFrame, nNew * sizeof(RbuFrame));
if( aNew==0 ) return SQLITE_NOMEM;
pRbu->aFrame = aNew;
pRbu->nFrameAlloc = nNew;
}
iFrame = (u32)((iOff-32) / (i64)(iAmt+24)) + 1;
if( pRbu->iMaxFrame<iFrame ) pRbu->iMaxFrame = iFrame;
pRbu->aFrame[pRbu->nFrame].iWalFrame = iFrame;
pRbu->aFrame[pRbu->nFrame].iDbPage = 0;
pRbu->nFrame++;
return SQLITE_OK;
}
/*
** Called when a page of data is written to offset iOff of the database
** file while the rbu handle is in capture mode. Record the page number
** of the page being written in the aFrame[] array.
*/
static int rbuCaptureDbWrite(sqlite3rbu *pRbu, i64 iOff){
pRbu->aFrame[pRbu->nFrame-1].iDbPage = (u32)(iOff / pRbu->pgsz) + 1;
return SQLITE_OK;
}
/*
** This is called as part of an incremental checkpoint operation. Copy
** a single frame of data from the wal file into the database file, as
** indicated by the RbuFrame object.
*/
static void rbuCheckpointFrame(sqlite3rbu *p, RbuFrame *pFrame){
sqlite3_file *pWal = p->pTargetFd->pWalFd->pReal;
sqlite3_file *pDb = p->pTargetFd->pReal;
i64 iOff;
assert( p->rc==SQLITE_OK );
iOff = (i64)(pFrame->iWalFrame-1) * (p->pgsz + 24) + 32 + 24;
p->rc = pWal->pMethods->xRead(pWal, p->aBuf, p->pgsz, iOff);
if( p->rc ) return;
iOff = (i64)(pFrame->iDbPage-1) * p->pgsz;
p->rc = pDb->pMethods->xWrite(pDb, p->aBuf, p->pgsz, iOff);
}
/*
** Take an EXCLUSIVE lock on the database file. Return SQLITE_OK if
** successful, or an SQLite error code otherwise.
*/
static int rbuLockDatabase(sqlite3 *db){
int rc = SQLITE_OK;
sqlite3_file *fd = 0;
sqlite3_file_control(db, "main", SQLITE_FCNTL_FILE_POINTER, &fd);
if( fd->pMethods ){
rc = fd->pMethods->xLock(fd, SQLITE_LOCK_SHARED);
if( rc==SQLITE_OK ){
rc = fd->pMethods->xLock(fd, SQLITE_LOCK_EXCLUSIVE);
}
}
return rc;
}
/*
** Return true if the database handle passed as the only argument
** was opened with the rbu_exclusive_checkpoint=1 URI parameter
** specified. Or false otherwise.
*/
static int rbuExclusiveCheckpoint(sqlite3 *db){
const char *zUri = sqlite3_db_filename(db, 0);
return sqlite3_uri_boolean(zUri, RBU_EXCLUSIVE_CHECKPOINT, 0);
}
#if defined(_WIN32_WCE)
static LPWSTR rbuWinUtf8ToUnicode(const char *zFilename){
int nChar;
LPWSTR zWideFilename;
nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, NULL, 0);
if( nChar==0 ){
return 0;
}
zWideFilename = sqlite3_malloc64( nChar*sizeof(zWideFilename[0]) );
if( zWideFilename==0 ){
return 0;
}
memset(zWideFilename, 0, nChar*sizeof(zWideFilename[0]));
nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, zWideFilename,
nChar);
if( nChar==0 ){
sqlite3_free(zWideFilename);
zWideFilename = 0;
}
return zWideFilename;
}
#endif
/*
** The RBU handle is currently in RBU_STAGE_OAL state, with a SHARED lock
** on the database file. This proc moves the *-oal file to the *-wal path,
** then reopens the database file (this time in vanilla, non-oal, WAL mode).
** If an error occurs, leave an error code and error message in the rbu
** handle.
*/
static void rbuMoveOalFile(sqlite3rbu *p){
const char *zBase = sqlite3_db_filename(p->dbMain, "main");
const char *zMove = zBase;
char *zOal;
char *zWal;
if( rbuIsVacuum(p) ){
zMove = sqlite3_db_filename(p->dbRbu, "main");
}
zOal = sqlite3_mprintf("%s-oal", zMove);
zWal = sqlite3_mprintf("%s-wal", zMove);
assert( p->eStage==RBU_STAGE_MOVE );
assert( p->rc==SQLITE_OK && p->zErrmsg==0 );
if( zWal==0 || zOal==0 ){
p->rc = SQLITE_NOMEM;
}else{
/* Move the *-oal file to *-wal. At this point connection p->db is
** holding a SHARED lock on the target database file (because it is
** in WAL mode). So no other connection may be writing the db.
**
** In order to ensure that there are no database readers, an EXCLUSIVE
** lock is obtained here before the *-oal is moved to *-wal.
*/
sqlite3 *dbMain = 0;
rbuFileSuffix3(zBase, zWal);
rbuFileSuffix3(zBase, zOal);
/* Re-open the databases. */
rbuObjIterFinalize(&p->objiter);
sqlite3_close(p->dbRbu);
sqlite3_close(p->dbMain);
p->dbMain = 0;
p->dbRbu = 0;
dbMain = rbuOpenDbhandle(p, p->zTarget, 1);
if( dbMain ){
assert( p->rc==SQLITE_OK );
p->rc = rbuLockDatabase(dbMain);
}
if( p->rc==SQLITE_OK ){
p->rc = p->xRename(p->pRenameArg, zOal, zWal);
}
if( p->rc!=SQLITE_OK
|| rbuIsVacuum(p)
|| rbuExclusiveCheckpoint(dbMain)==0
){
sqlite3_close(dbMain);
dbMain = 0;
}
if( p->rc==SQLITE_OK ){
rbuOpenDatabase(p, dbMain, 0);
rbuSetupCheckpoint(p, 0);
}
}
sqlite3_free(zWal);
sqlite3_free(zOal);
}
/*
** The SELECT statement iterating through the keys for the current object
** (p->objiter.pSelect) currently points to a valid row. This function
** determines the type of operation requested by this row and returns
** one of the following values to indicate the result:
**
** * RBU_INSERT
** * RBU_DELETE
** * RBU_IDX_DELETE
** * RBU_UPDATE
**
** If RBU_UPDATE is returned, then output variable *pzMask is set to
** point to the text value indicating the columns to update.
**
** If the rbu_control field contains an invalid value, an error code and
** message are left in the RBU handle and zero returned.
*/
static int rbuStepType(sqlite3rbu *p, const char **pzMask){
int iCol = p->objiter.nCol; /* Index of rbu_control column */
int res = 0; /* Return value */
switch( sqlite3_column_type(p->objiter.pSelect, iCol) ){
case SQLITE_INTEGER: {
int iVal = sqlite3_column_int(p->objiter.pSelect, iCol);
switch( iVal ){
case 0: res = RBU_INSERT; break;
case 1: res = RBU_DELETE; break;
case 2: res = RBU_REPLACE; break;
case 3: res = RBU_IDX_DELETE; break;
case 4: res = RBU_IDX_INSERT; break;
}
break;
}
case SQLITE_TEXT: {
const unsigned char *z = sqlite3_column_text(p->objiter.pSelect, iCol);
if( z==0 ){
p->rc = SQLITE_NOMEM;
}else{
*pzMask = (const char*)z;
}
res = RBU_UPDATE;
break;
}
default:
break;
}
if( res==0 ){
rbuBadControlError(p);
}
return res;
}
#ifdef SQLITE_DEBUG
/*
** Assert that column iCol of statement pStmt is named zName.
*/
static void assertColumnName(sqlite3_stmt *pStmt, int iCol, const char *zName){
const char *zCol = sqlite3_column_name(pStmt, iCol);
assert( 0==sqlite3_stricmp(zName, zCol) );
}
#else
# define assertColumnName(x,y,z)
#endif
/*
** Argument eType must be one of RBU_INSERT, RBU_DELETE, RBU_IDX_INSERT or
** RBU_IDX_DELETE. This function performs the work of a single
** sqlite3rbu_step() call for the type of operation specified by eType.
*/
static void rbuStepOneOp(sqlite3rbu *p, int eType){
RbuObjIter *pIter = &p->objiter;
sqlite3_value *pVal;
sqlite3_stmt *pWriter;
int i;
assert( p->rc==SQLITE_OK );
assert( eType!=RBU_DELETE || pIter->zIdx==0 );
assert( eType==RBU_DELETE || eType==RBU_IDX_DELETE
|| eType==RBU_INSERT || eType==RBU_IDX_INSERT
);
/* If this is a delete, decrement nPhaseOneStep by nIndex. If the DELETE
** statement below does actually delete a row, nPhaseOneStep will be
** incremented by the same amount when SQL function rbu_tmp_insert()
** is invoked by the trigger. */
if( eType==RBU_DELETE ){
p->nPhaseOneStep -= p->objiter.nIndex;
}
if( eType==RBU_IDX_DELETE || eType==RBU_DELETE ){
pWriter = pIter->pDelete;
}else{
pWriter = pIter->pInsert;
}
for(i=0; i<pIter->nCol; i++){
/* If this is an INSERT into a table b-tree and the table has an
** explicit INTEGER PRIMARY KEY, check that this is not an attempt
** to write a NULL into the IPK column. That is not permitted. */
if( eType==RBU_INSERT
&& pIter->zIdx==0 && pIter->eType==RBU_PK_IPK && pIter->abTblPk[i]
&& sqlite3_column_type(pIter->pSelect, i)==SQLITE_NULL
){
p->rc = SQLITE_MISMATCH;
p->zErrmsg = sqlite3_mprintf("datatype mismatch");
return;
}
if( eType==RBU_DELETE && pIter->abTblPk[i]==0 ){
continue;
}
pVal = sqlite3_column_value(pIter->pSelect, i);
p->rc = sqlite3_bind_value(pWriter, i+1, pVal);
if( p->rc ) return;
}
if( pIter->zIdx==0 ){
if( pIter->eType==RBU_PK_VTAB
|| pIter->eType==RBU_PK_NONE
|| (pIter->eType==RBU_PK_EXTERNAL && rbuIsVacuum(p))
){
/* For a virtual table, or a table with no primary key, the
** SELECT statement is:
**
** SELECT <cols>, rbu_control, rbu_rowid FROM ....
**
** Hence column_value(pIter->nCol+1).
*/
assertColumnName(pIter->pSelect, pIter->nCol+1,
rbuIsVacuum(p) ? "rowid" : "rbu_rowid"
);
pVal = sqlite3_column_value(pIter->pSelect, pIter->nCol+1);
p->rc = sqlite3_bind_value(pWriter, pIter->nCol+1, pVal);
}
}
if( p->rc==SQLITE_OK ){
sqlite3_step(pWriter);
p->rc = resetAndCollectError(pWriter, &p->zErrmsg);
}
}
/*
** This function does the work for an sqlite3rbu_step() call.
**
** The object-iterator (p->objiter) currently points to a valid object,
** and the input cursor (p->objiter.pSelect) currently points to a valid
** input row. Perform whatever processing is required and return.
**
** If no error occurs, SQLITE_OK is returned. Otherwise, an error code
** and message is left in the RBU handle and a copy of the error code
** returned.
*/
static int rbuStep(sqlite3rbu *p){
RbuObjIter *pIter = &p->objiter;
const char *zMask = 0;
int eType = rbuStepType(p, &zMask);
if( eType ){
assert( eType==RBU_INSERT || eType==RBU_DELETE
|| eType==RBU_REPLACE || eType==RBU_IDX_DELETE
|| eType==RBU_IDX_INSERT || eType==RBU_UPDATE
);
assert( eType!=RBU_UPDATE || pIter->zIdx==0 );
if( pIter->zIdx==0 && (eType==RBU_IDX_DELETE || eType==RBU_IDX_INSERT) ){
rbuBadControlError(p);
}
else if( eType==RBU_REPLACE ){
if( pIter->zIdx==0 ){
p->nPhaseOneStep += p->objiter.nIndex;
rbuStepOneOp(p, RBU_DELETE);
}
if( p->rc==SQLITE_OK ) rbuStepOneOp(p, RBU_INSERT);
}
else if( eType!=RBU_UPDATE ){
rbuStepOneOp(p, eType);
}
else{
sqlite3_value *pVal;
sqlite3_stmt *pUpdate = 0;
assert( eType==RBU_UPDATE );
p->nPhaseOneStep -= p->objiter.nIndex;
rbuGetUpdateStmt(p, pIter, zMask, &pUpdate);
if( pUpdate ){
int i;
for(i=0; p->rc==SQLITE_OK && i<pIter->nCol; i++){
char c = zMask[pIter->aiSrcOrder[i]];
pVal = sqlite3_column_value(pIter->pSelect, i);
if( pIter->abTblPk[i] || c!='.' ){
p->rc = sqlite3_bind_value(pUpdate, i+1, pVal);
}
}
if( p->rc==SQLITE_OK
&& (pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE)
){
/* Bind the rbu_rowid value to column _rowid_ */
assertColumnName(pIter->pSelect, pIter->nCol+1, "rbu_rowid");
pVal = sqlite3_column_value(pIter->pSelect, pIter->nCol+1);
p->rc = sqlite3_bind_value(pUpdate, pIter->nCol+1, pVal);
}
if( p->rc==SQLITE_OK ){
sqlite3_step(pUpdate);
p->rc = resetAndCollectError(pUpdate, &p->zErrmsg);
}
}
}
}
return p->rc;
}
/*
** Increment the schema cookie of the main database opened by p->dbMain.
**
** Or, if this is an RBU vacuum, set the schema cookie of the main db
** opened by p->dbMain to one more than the schema cookie of the main
** db opened by p->dbRbu.
*/
static void rbuIncrSchemaCookie(sqlite3rbu *p){
if( p->rc==SQLITE_OK ){
sqlite3 *dbread = (rbuIsVacuum(p) ? p->dbRbu : p->dbMain);
int iCookie = 1000000;
sqlite3_stmt *pStmt;
p->rc = prepareAndCollectError(dbread, &pStmt, &p->zErrmsg,
"PRAGMA schema_version"
);
if( p->rc==SQLITE_OK ){
/* Coverage: it may be that this sqlite3_step() cannot fail. There
** is already a transaction open, so the prepared statement cannot
** throw an SQLITE_SCHEMA exception. The only database page the
** statement reads is page 1, which is guaranteed to be in the cache.
** And no memory allocations are required. */
if( SQLITE_ROW==sqlite3_step(pStmt) ){
iCookie = sqlite3_column_int(pStmt, 0);
}
rbuFinalize(p, pStmt);
}
if( p->rc==SQLITE_OK ){
rbuMPrintfExec(p, p->dbMain, "PRAGMA schema_version = %d", iCookie+1);
}
}
}
/*
** Update the contents of the rbu_state table within the rbu database. The
** value stored in the RBU_STATE_STAGE column is eStage. All other values
** are determined by inspecting the rbu handle passed as the first argument.
*/
static void rbuSaveState(sqlite3rbu *p, int eStage){
if( p->rc==SQLITE_OK || p->rc==SQLITE_DONE ){
sqlite3_stmt *pInsert = 0;
rbu_file *pFd = (rbuIsVacuum(p) ? p->pRbuFd : p->pTargetFd);
int rc;
assert( p->zErrmsg==0 );
rc = prepareFreeAndCollectError(p->dbRbu, &pInsert, &p->zErrmsg,
sqlite3_mprintf(
"INSERT OR REPLACE INTO %s.rbu_state(k, v) VALUES "
"(%d, %d), "
"(%d, %Q), "
"(%d, %Q), "
"(%d, %d), "
"(%d, %d), "
"(%d, %lld), "
"(%d, %lld), "
"(%d, %lld), "
"(%d, %lld), "
"(%d, %Q) ",
p->zStateDb,
RBU_STATE_STAGE, eStage,
RBU_STATE_TBL, p->objiter.zTbl,
RBU_STATE_IDX, p->objiter.zIdx,
RBU_STATE_ROW, p->nStep,
RBU_STATE_PROGRESS, p->nProgress,
RBU_STATE_CKPT, p->iWalCksum,
RBU_STATE_COOKIE, (i64)pFd->iCookie,
RBU_STATE_OALSZ, p->iOalSz,
RBU_STATE_PHASEONESTEP, p->nPhaseOneStep,
RBU_STATE_DATATBL, p->objiter.zDataTbl
)
);
assert( pInsert==0 || rc==SQLITE_OK );
if( rc==SQLITE_OK ){
sqlite3_step(pInsert);
rc = sqlite3_finalize(pInsert);
}
if( rc!=SQLITE_OK ) p->rc = rc;
}
}
/*
** The second argument passed to this function is the name of a PRAGMA
** setting - "page_size", "auto_vacuum", "user_version" or "application_id".
** This function executes the following on sqlite3rbu.dbRbu:
**
** "PRAGMA main.$zPragma"
**
** where $zPragma is the string passed as the second argument, then
** on sqlite3rbu.dbMain:
**
** "PRAGMA main.$zPragma = $val"
**
** where $val is the value returned by the first PRAGMA invocation.
**
** In short, it copies the value of the specified PRAGMA setting from
** dbRbu to dbMain.
*/
static void rbuCopyPragma(sqlite3rbu *p, const char *zPragma){
if( p->rc==SQLITE_OK ){
sqlite3_stmt *pPragma = 0;
p->rc = prepareFreeAndCollectError(p->dbRbu, &pPragma, &p->zErrmsg,
sqlite3_mprintf("PRAGMA main.%s", zPragma)
);
if( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pPragma) ){
p->rc = rbuMPrintfExec(p, p->dbMain, "PRAGMA main.%s = %d",
zPragma, sqlite3_column_int(pPragma, 0)
);
}
rbuFinalize(p, pPragma);
}
}
/*
** The RBU handle passed as the only argument has just been opened and
** the state database is empty. If this RBU handle was opened for an
** RBU vacuum operation, create the schema in the target db.
*/
static void rbuCreateTargetSchema(sqlite3rbu *p){
sqlite3_stmt *pSql = 0;
sqlite3_stmt *pInsert = 0;
assert( rbuIsVacuum(p) );
p->rc = sqlite3_exec(p->dbMain, "PRAGMA writable_schema=1", 0,0, &p->zErrmsg);
if( p->rc==SQLITE_OK ){
p->rc = prepareAndCollectError(p->dbRbu, &pSql, &p->zErrmsg,
"SELECT sql FROM sqlite_schema WHERE sql!='' AND rootpage!=0"
" AND name!='sqlite_sequence' "
" ORDER BY type DESC"
);
}
while( p->rc==SQLITE_OK && sqlite3_step(pSql)==SQLITE_ROW ){
const char *zSql = (const char*)sqlite3_column_text(pSql, 0);
p->rc = sqlite3_exec(p->dbMain, zSql, 0, 0, &p->zErrmsg);
}
rbuFinalize(p, pSql);
if( p->rc!=SQLITE_OK ) return;
if( p->rc==SQLITE_OK ){
p->rc = prepareAndCollectError(p->dbRbu, &pSql, &p->zErrmsg,
"SELECT * FROM sqlite_schema WHERE rootpage=0 OR rootpage IS NULL"
);
}
if( p->rc==SQLITE_OK ){
p->rc = prepareAndCollectError(p->dbMain, &pInsert, &p->zErrmsg,
"INSERT INTO sqlite_schema VALUES(?,?,?,?,?)"
);
}
while( p->rc==SQLITE_OK && sqlite3_step(pSql)==SQLITE_ROW ){
int i;
for(i=0; i<5; i++){
sqlite3_bind_value(pInsert, i+1, sqlite3_column_value(pSql, i));
}
sqlite3_step(pInsert);
p->rc = sqlite3_reset(pInsert);
}
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_exec(p->dbMain, "PRAGMA writable_schema=0",0,0,&p->zErrmsg);
}
rbuFinalize(p, pSql);
rbuFinalize(p, pInsert);
}
/*
** Step the RBU object.
*/
int sqlite3rbu_step(sqlite3rbu *p){
if( p ){
switch( p->eStage ){
case RBU_STAGE_OAL: {
RbuObjIter *pIter = &p->objiter;
/* If this is an RBU vacuum operation and the state table was empty
** when this handle was opened, create the target database schema. */
if( rbuIsVacuum(p) && p->nProgress==0 && p->rc==SQLITE_OK ){
rbuCreateTargetSchema(p);
rbuCopyPragma(p, "user_version");
rbuCopyPragma(p, "application_id");
}
while( p->rc==SQLITE_OK && pIter->zTbl ){
if( pIter->bCleanup ){
/* Clean up the rbu_tmp_xxx table for the previous table. It
** cannot be dropped as there are currently active SQL statements.
** But the contents can be deleted. */
if( rbuIsVacuum(p)==0 && pIter->abIndexed ){
rbuMPrintfExec(p, p->dbRbu,
"DELETE FROM %s.'rbu_tmp_%q'", p->zStateDb, pIter->zDataTbl
);
}
}else{
rbuObjIterPrepareAll(p, pIter, 0);
/* Advance to the next row to process. */
if( p->rc==SQLITE_OK ){
int rc = sqlite3_step(pIter->pSelect);
if( rc==SQLITE_ROW ){
p->nProgress++;
p->nStep++;
return rbuStep(p);
}
p->rc = sqlite3_reset(pIter->pSelect);
p->nStep = 0;
}
}
rbuObjIterNext(p, pIter);
}
if( p->rc==SQLITE_OK ){
assert( pIter->zTbl==0 );
rbuSaveState(p, RBU_STAGE_MOVE);
rbuIncrSchemaCookie(p);
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_exec(p->dbMain, "COMMIT", 0, 0, &p->zErrmsg);
}
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, &p->zErrmsg);
}
p->eStage = RBU_STAGE_MOVE;
}
break;
}
case RBU_STAGE_MOVE: {
if( p->rc==SQLITE_OK ){
rbuMoveOalFile(p);
p->nProgress++;
}
break;
}
case RBU_STAGE_CKPT: {
if( p->rc==SQLITE_OK ){
if( p->nStep>=p->nFrame ){
sqlite3_file *pDb = p->pTargetFd->pReal;
/* Sync the db file */
p->rc = pDb->pMethods->xSync(pDb, SQLITE_SYNC_NORMAL);
/* Update nBackfill */
if( p->rc==SQLITE_OK ){
void volatile *ptr;
p->rc = pDb->pMethods->xShmMap(pDb, 0, 32*1024, 0, &ptr);
if( p->rc==SQLITE_OK ){
((u32 volatile*)ptr)[24] = p->iMaxFrame;
}
}
if( p->rc==SQLITE_OK ){
p->eStage = RBU_STAGE_DONE;
p->rc = SQLITE_DONE;
}
}else{
/* At one point the following block copied a single frame from the
** wal file to the database file. So that one call to sqlite3rbu_step()
** checkpointed a single frame.
**
** However, if the sector-size is larger than the page-size, and the
** application calls sqlite3rbu_savestate() or close() immediately
** after this step, then rbu_step() again, then a power failure occurs,
** then the database page written here may be damaged. Work around
** this by checkpointing frames until the next page in the aFrame[]
** lies on a different disk sector to the current one. */
u32 iSector;
do{
RbuFrame *pFrame = &p->aFrame[p->nStep];
iSector = (pFrame->iDbPage-1) / p->nPagePerSector;
rbuCheckpointFrame(p, pFrame);
p->nStep++;
}while( p->nStep<p->nFrame
&& iSector==((p->aFrame[p->nStep].iDbPage-1) / p->nPagePerSector)
&& p->rc==SQLITE_OK
);
}
p->nProgress++;
}
break;
}
default:
break;
}
return p->rc;
}else{
return SQLITE_NOMEM;
}
}
/*
** Compare strings z1 and z2, returning 0 if they are identical, or non-zero
** otherwise. Either or both argument may be NULL. Two NULL values are
** considered equal, and NULL is considered distinct from all other values.
*/
static int rbuStrCompare(const char *z1, const char *z2){
if( z1==0 && z2==0 ) return 0;
if( z1==0 || z2==0 ) return 1;
return (sqlite3_stricmp(z1, z2)!=0);
}
/*
** This function is called as part of sqlite3rbu_open() when initializing
** an rbu handle in OAL stage. If the rbu update has not started (i.e.
** the rbu_state table was empty) it is a no-op. Otherwise, it arranges
** things so that the next call to sqlite3rbu_step() continues on from
** where the previous rbu handle left off.
**
** If an error occurs, an error code and error message are left in the
** rbu handle passed as the first argument.
*/
static void rbuSetupOal(sqlite3rbu *p, RbuState *pState){
assert( p->rc==SQLITE_OK );
if( pState->zTbl ){
RbuObjIter *pIter = &p->objiter;
int rc = SQLITE_OK;
while( rc==SQLITE_OK && pIter->zTbl && (pIter->bCleanup
|| rbuStrCompare(pIter->zIdx, pState->zIdx)
|| (pState->zDataTbl==0 && rbuStrCompare(pIter->zTbl, pState->zTbl))
|| (pState->zDataTbl && rbuStrCompare(pIter->zDataTbl, pState->zDataTbl))
)){
rc = rbuObjIterNext(p, pIter);
}
if( rc==SQLITE_OK && !pIter->zTbl ){
rc = SQLITE_ERROR;
p->zErrmsg = sqlite3_mprintf("rbu_state mismatch error");
}
if( rc==SQLITE_OK ){
p->nStep = pState->nRow;
rc = rbuObjIterPrepareAll(p, &p->objiter, p->nStep);
}
p->rc = rc;
}
}
/*
** If there is a "*-oal" file in the file-system corresponding to the
** target database in the file-system, delete it. If an error occurs,
** leave an error code and error message in the rbu handle.
*/
static void rbuDeleteOalFile(sqlite3rbu *p){
char *zOal = rbuMPrintf(p, "%s-oal", p->zTarget);
if( zOal ){
sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
assert( pVfs && p->rc==SQLITE_OK && p->zErrmsg==0 );
pVfs->xDelete(pVfs, zOal, 0);
sqlite3_free(zOal);
}
}
/*
** Allocate a private rbu VFS for the rbu handle passed as the only
** argument. This VFS will be used unless the call to sqlite3rbu_open()
** specified a URI with a vfs=? option in place of a target database
** file name.
*/
static void rbuCreateVfs(sqlite3rbu *p){
int rnd;
char zRnd[64];
assert( p->rc==SQLITE_OK );
sqlite3_randomness(sizeof(int), (void*)&rnd);
sqlite3_snprintf(sizeof(zRnd), zRnd, "rbu_vfs_%d", rnd);
p->rc = sqlite3rbu_create_vfs(zRnd, 0);
if( p->rc==SQLITE_OK ){
sqlite3_vfs *pVfs = sqlite3_vfs_find(zRnd);
assert( pVfs );
p->zVfsName = pVfs->zName;
((rbu_vfs*)pVfs)->pRbu = p;
}
}
/*
** Destroy the private VFS created for the rbu handle passed as the only
** argument by an earlier call to rbuCreateVfs().
*/
static void rbuDeleteVfs(sqlite3rbu *p){
if( p->zVfsName ){
sqlite3rbu_destroy_vfs(p->zVfsName);
p->zVfsName = 0;
}
}
/*
** This user-defined SQL function is invoked with a single argument - the
** name of a table expected to appear in the target database. It returns
** the number of auxilliary indexes on the table.
*/
static void rbuIndexCntFunc(
sqlite3_context *pCtx,
int nVal,
sqlite3_value **apVal
){
sqlite3rbu *p = (sqlite3rbu*)sqlite3_user_data(pCtx);
sqlite3_stmt *pStmt = 0;
char *zErrmsg = 0;
int rc;
sqlite3 *db = (rbuIsVacuum(p) ? p->dbRbu : p->dbMain);
assert( nVal==1 );
rc = prepareFreeAndCollectError(db, &pStmt, &zErrmsg,
sqlite3_mprintf("SELECT count(*) FROM sqlite_schema "
"WHERE type='index' AND tbl_name = %Q", sqlite3_value_text(apVal[0]))
);
if( rc!=SQLITE_OK ){
sqlite3_result_error(pCtx, zErrmsg, -1);
}else{
int nIndex = 0;
if( SQLITE_ROW==sqlite3_step(pStmt) ){
nIndex = sqlite3_column_int(pStmt, 0);
}
rc = sqlite3_finalize(pStmt);
if( rc==SQLITE_OK ){
sqlite3_result_int(pCtx, nIndex);
}else{
sqlite3_result_error(pCtx, sqlite3_errmsg(db), -1);
}
}
sqlite3_free(zErrmsg);
}
/*
** If the RBU database contains the rbu_count table, use it to initialize
** the sqlite3rbu.nPhaseOneStep variable. The schema of the rbu_count table
** is assumed to contain the same columns as:
**
** CREATE TABLE rbu_count(tbl TEXT PRIMARY KEY, cnt INTEGER) WITHOUT ROWID;
**
** There should be one row in the table for each data_xxx table in the
** database. The 'tbl' column should contain the name of a data_xxx table,
** and the cnt column the number of rows it contains.
**
** sqlite3rbu.nPhaseOneStep is initialized to the sum of (1 + nIndex) * cnt
** for all rows in the rbu_count table, where nIndex is the number of
** indexes on the corresponding target database table.
*/
static void rbuInitPhaseOneSteps(sqlite3rbu *p){
if( p->rc==SQLITE_OK ){
sqlite3_stmt *pStmt = 0;
int bExists = 0; /* True if rbu_count exists */
p->nPhaseOneStep = -1;
p->rc = sqlite3_create_function(p->dbRbu,
"rbu_index_cnt", 1, SQLITE_UTF8, (void*)p, rbuIndexCntFunc, 0, 0
);
/* Check for the rbu_count table. If it does not exist, or if an error
** occurs, nPhaseOneStep will be left set to -1. */
if( p->rc==SQLITE_OK ){
p->rc = prepareAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
"SELECT 1 FROM sqlite_schema WHERE tbl_name = 'rbu_count'"
);
}
if( p->rc==SQLITE_OK ){
if( SQLITE_ROW==sqlite3_step(pStmt) ){
bExists = 1;
}
p->rc = sqlite3_finalize(pStmt);
}
if( p->rc==SQLITE_OK && bExists ){
p->rc = prepareAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
"SELECT sum(cnt * (1 + rbu_index_cnt(rbu_target_name(tbl))))"
"FROM rbu_count"
);
if( p->rc==SQLITE_OK ){
if( SQLITE_ROW==sqlite3_step(pStmt) ){
p->nPhaseOneStep = sqlite3_column_int64(pStmt, 0);
}
p->rc = sqlite3_finalize(pStmt);
}
}
}
}
static sqlite3rbu *openRbuHandle(
const char *zTarget,
const char *zRbu,
const char *zState
){
sqlite3rbu *p;
size_t nTarget = zTarget ? strlen(zTarget) : 0;
size_t nRbu = strlen(zRbu);
size_t nByte = sizeof(sqlite3rbu) + nTarget+1 + nRbu+1;
p = (sqlite3rbu*)sqlite3_malloc64(nByte);
if( p ){
RbuState *pState = 0;
/* Create the custom VFS. */
memset(p, 0, sizeof(sqlite3rbu));
sqlite3rbu_rename_handler(p, 0, 0);
rbuCreateVfs(p);
/* Open the target, RBU and state databases */
if( p->rc==SQLITE_OK ){
char *pCsr = (char*)&p[1];
int bRetry = 0;
if( zTarget ){
p->zTarget = pCsr;
memcpy(p->zTarget, zTarget, nTarget+1);
pCsr += nTarget+1;
}
p->zRbu = pCsr;
memcpy(p->zRbu, zRbu, nRbu+1);
pCsr += nRbu+1;
if( zState ){
p->zState = rbuMPrintf(p, "%s", zState);
}
/* If the first attempt to open the database file fails and the bRetry
** flag it set, this means that the db was not opened because it seemed
** to be a wal-mode db. But, this may have happened due to an earlier
** RBU vacuum operation leaving an old wal file in the directory.
** If this is the case, it will have been checkpointed and deleted
** when the handle was closed and a second attempt to open the
** database may succeed. */
rbuOpenDatabase(p, 0, &bRetry);
if( bRetry ){
rbuOpenDatabase(p, 0, 0);
}
}
if( p->rc==SQLITE_OK ){
pState = rbuLoadState(p);
assert( pState || p->rc!=SQLITE_OK );
if( p->rc==SQLITE_OK ){
if( pState->eStage==0 ){
rbuDeleteOalFile(p);
rbuInitPhaseOneSteps(p);
p->eStage = RBU_STAGE_OAL;
}else{
p->eStage = pState->eStage;
p->nPhaseOneStep = pState->nPhaseOneStep;
}
p->nProgress = pState->nProgress;
p->iOalSz = pState->iOalSz;
}
}
assert( p->rc!=SQLITE_OK || p->eStage!=0 );
if( p->rc==SQLITE_OK && p->pTargetFd->pWalFd ){
if( p->eStage==RBU_STAGE_OAL ){
p->rc = SQLITE_ERROR;
p->zErrmsg = sqlite3_mprintf("cannot update wal mode database");
}else if( p->eStage==RBU_STAGE_MOVE ){
p->eStage = RBU_STAGE_CKPT;
p->nStep = 0;
}
}
if( p->rc==SQLITE_OK
&& (p->eStage==RBU_STAGE_OAL || p->eStage==RBU_STAGE_MOVE)
&& pState->eStage!=0
){
rbu_file *pFd = (rbuIsVacuum(p) ? p->pRbuFd : p->pTargetFd);
if( pFd->iCookie!=pState->iCookie ){
/* At this point (pTargetFd->iCookie) contains the value of the
** change-counter cookie (the thing that gets incremented when a
** transaction is committed in rollback mode) currently stored on
** page 1 of the database file. */
p->rc = SQLITE_BUSY;
p->zErrmsg = sqlite3_mprintf("database modified during rbu %s",
(rbuIsVacuum(p) ? "vacuum" : "update")
);
}
}
if( p->rc==SQLITE_OK ){
if( p->eStage==RBU_STAGE_OAL ){
sqlite3 *db = p->dbMain;
p->rc = sqlite3_exec(p->dbRbu, "BEGIN", 0, 0, &p->zErrmsg);
/* Point the object iterator at the first object */
if( p->rc==SQLITE_OK ){
p->rc = rbuObjIterFirst(p, &p->objiter);
}
/* If the RBU database contains no data_xxx tables, declare the RBU
** update finished. */
if( p->rc==SQLITE_OK && p->objiter.zTbl==0 ){
p->rc = SQLITE_DONE;
p->eStage = RBU_STAGE_DONE;
}else{
if( p->rc==SQLITE_OK && pState->eStage==0 && rbuIsVacuum(p) ){
rbuCopyPragma(p, "page_size");
rbuCopyPragma(p, "auto_vacuum");
}
/* Open transactions both databases. The *-oal file is opened or
** created at this point. */
if( p->rc==SQLITE_OK ){
p->rc = sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, &p->zErrmsg);
}
/* Check if the main database is a zipvfs db. If it is, set the upper
** level pager to use "journal_mode=off". This prevents it from
** generating a large journal using a temp file. */
if( p->rc==SQLITE_OK ){
int frc = sqlite3_file_control(db, "main", SQLITE_FCNTL_ZIPVFS, 0);
if( frc==SQLITE_OK ){
p->rc = sqlite3_exec(
db, "PRAGMA journal_mode=off",0,0,&p->zErrmsg);
}
}
if( p->rc==SQLITE_OK ){
rbuSetupOal(p, pState);
}
}
}else if( p->eStage==RBU_STAGE_MOVE ){
/* no-op */
}else if( p->eStage==RBU_STAGE_CKPT ){
if( !rbuIsVacuum(p) && rbuExclusiveCheckpoint(p->dbMain) ){
/* If the rbu_exclusive_checkpoint=1 URI parameter was specified
** and an incremental checkpoint is being resumed, attempt an
** exclusive lock on the db file. If this fails, so be it. */
p->eStage = RBU_STAGE_DONE;
rbuLockDatabase(p->dbMain);
p->eStage = RBU_STAGE_CKPT;
}
rbuSetupCheckpoint(p, pState);
}else if( p->eStage==RBU_STAGE_DONE ){
p->rc = SQLITE_DONE;
}else{
p->rc = SQLITE_CORRUPT;
}
}
rbuFreeState(pState);
}
return p;
}
/*
** Allocate and return an RBU handle with all fields zeroed except for the
** error code, which is set to SQLITE_MISUSE.
*/
static sqlite3rbu *rbuMisuseError(void){
sqlite3rbu *pRet;
pRet = sqlite3_malloc64(sizeof(sqlite3rbu));
if( pRet ){
memset(pRet, 0, sizeof(sqlite3rbu));
pRet->rc = SQLITE_MISUSE;
}
return pRet;
}
/*
** Open and return a new RBU handle.
*/
sqlite3rbu *sqlite3rbu_open(
const char *zTarget,
const char *zRbu,
const char *zState
){
if( zTarget==0 || zRbu==0 ){ return rbuMisuseError(); }
return openRbuHandle(zTarget, zRbu, zState);
}
/*
** Open a handle to begin or resume an RBU VACUUM operation.
*/
sqlite3rbu *sqlite3rbu_vacuum(
const char *zTarget,
const char *zState
){
if( zTarget==0 ){ return rbuMisuseError(); }
if( zState ){
int n = strlen(zState);
if( n>=7 && 0==memcmp("-vactmp", &zState[n-7], 7) ){
return rbuMisuseError();
}
}
/* TODO: Check that both arguments are non-NULL */
return openRbuHandle(0, zTarget, zState);
}
/*
** Return the database handle used by pRbu.
*/
sqlite3 *sqlite3rbu_db(sqlite3rbu *pRbu, int bRbu){
sqlite3 *db = 0;
if( pRbu ){
db = (bRbu ? pRbu->dbRbu : pRbu->dbMain);
}
return db;
}
/*
** If the error code currently stored in the RBU handle is SQLITE_CONSTRAINT,
** then edit any error message string so as to remove all occurrences of
** the pattern "rbu_imp_[0-9]*".
*/
static void rbuEditErrmsg(sqlite3rbu *p){
if( p->rc==SQLITE_CONSTRAINT && p->zErrmsg ){
unsigned int i;
size_t nErrmsg = strlen(p->zErrmsg);
for(i=0; i<(nErrmsg-8); i++){
if( memcmp(&p->zErrmsg[i], "rbu_imp_", 8)==0 ){
int nDel = 8;
while( p->zErrmsg[i+nDel]>='0' && p->zErrmsg[i+nDel]<='9' ) nDel++;
memmove(&p->zErrmsg[i], &p->zErrmsg[i+nDel], nErrmsg + 1 - i - nDel);
nErrmsg -= nDel;
}
}
}
}
/*
** Close the RBU handle.
*/
int sqlite3rbu_close(sqlite3rbu *p, char **pzErrmsg){
int rc;
if( p ){
/* Commit the transaction to the *-oal file. */
if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_OAL ){
p->rc = sqlite3_exec(p->dbMain, "COMMIT", 0, 0, &p->zErrmsg);
}
/* Sync the db file if currently doing an incremental checkpoint */
if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_CKPT ){
sqlite3_file *pDb = p->pTargetFd->pReal;
p->rc = pDb->pMethods->xSync(pDb, SQLITE_SYNC_NORMAL);
}
rbuSaveState(p, p->eStage);
if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_OAL ){
p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, &p->zErrmsg);
}
/* Close any open statement handles. */
rbuObjIterFinalize(&p->objiter);
/* If this is an RBU vacuum handle and the vacuum has either finished
** successfully or encountered an error, delete the contents of the
** state table. This causes the next call to sqlite3rbu_vacuum()
** specifying the current target and state databases to start a new
** vacuum from scratch. */
if( rbuIsVacuum(p) && p->rc!=SQLITE_OK && p->dbRbu ){
int rc2 = sqlite3_exec(p->dbRbu, "DELETE FROM stat.rbu_state", 0, 0, 0);
if( p->rc==SQLITE_DONE && rc2!=SQLITE_OK ) p->rc = rc2;
}
/* Close the open database handle and VFS object. */
sqlite3_close(p->dbRbu);
sqlite3_close(p->dbMain);
assert( p->szTemp==0 );
rbuDeleteVfs(p);
sqlite3_free(p->aBuf);
sqlite3_free(p->aFrame);
rbuEditErrmsg(p);
rc = p->rc;
if( pzErrmsg ){
*pzErrmsg = p->zErrmsg;
}else{
sqlite3_free(p->zErrmsg);
}
sqlite3_free(p->zState);
sqlite3_free(p);
}else{
rc = SQLITE_NOMEM;
*pzErrmsg = 0;
}
return rc;
}
/*
** Return the total number of key-value operations (inserts, deletes or
** updates) that have been performed on the target database since the
** current RBU update was started.
*/
sqlite3_int64 sqlite3rbu_progress(sqlite3rbu *pRbu){
return pRbu->nProgress;
}
/*
** Return permyriadage progress indications for the two main stages of
** an RBU update.
*/
void sqlite3rbu_bp_progress(sqlite3rbu *p, int *pnOne, int *pnTwo){
const int MAX_PROGRESS = 10000;
switch( p->eStage ){
case RBU_STAGE_OAL:
if( p->nPhaseOneStep>0 ){
*pnOne = (int)(MAX_PROGRESS * (i64)p->nProgress/(i64)p->nPhaseOneStep);
}else{
*pnOne = -1;
}
*pnTwo = 0;
break;
case RBU_STAGE_MOVE:
*pnOne = MAX_PROGRESS;
*pnTwo = 0;
break;
case RBU_STAGE_CKPT:
*pnOne = MAX_PROGRESS;
*pnTwo = (int)(MAX_PROGRESS * (i64)p->nStep / (i64)p->nFrame);
break;
case RBU_STAGE_DONE:
*pnOne = MAX_PROGRESS;
*pnTwo = MAX_PROGRESS;
break;
default:
assert( 0 );
}
}
/*
** Return the current state of the RBU vacuum or update operation.
*/
int sqlite3rbu_state(sqlite3rbu *p){
int aRes[] = {
0, SQLITE_RBU_STATE_OAL, SQLITE_RBU_STATE_MOVE,
0, SQLITE_RBU_STATE_CHECKPOINT, SQLITE_RBU_STATE_DONE
};
assert( RBU_STAGE_OAL==1 );
assert( RBU_STAGE_MOVE==2 );
assert( RBU_STAGE_CKPT==4 );
assert( RBU_STAGE_DONE==5 );
assert( aRes[RBU_STAGE_OAL]==SQLITE_RBU_STATE_OAL );
assert( aRes[RBU_STAGE_MOVE]==SQLITE_RBU_STATE_MOVE );
assert( aRes[RBU_STAGE_CKPT]==SQLITE_RBU_STATE_CHECKPOINT );
assert( aRes[RBU_STAGE_DONE]==SQLITE_RBU_STATE_DONE );
if( p->rc!=SQLITE_OK && p->rc!=SQLITE_DONE ){
return SQLITE_RBU_STATE_ERROR;
}else{
assert( p->rc!=SQLITE_DONE || p->eStage==RBU_STAGE_DONE );
assert( p->eStage==RBU_STAGE_OAL
|| p->eStage==RBU_STAGE_MOVE
|| p->eStage==RBU_STAGE_CKPT
|| p->eStage==RBU_STAGE_DONE
);
return aRes[p->eStage];
}
}
int sqlite3rbu_savestate(sqlite3rbu *p){
int rc = p->rc;
if( rc==SQLITE_DONE ) return SQLITE_OK;
assert( p->eStage>=RBU_STAGE_OAL && p->eStage<=RBU_STAGE_DONE );
if( p->eStage==RBU_STAGE_OAL ){
assert( rc!=SQLITE_DONE );
if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbMain, "COMMIT", 0, 0, 0);
}
/* Sync the db file */
if( rc==SQLITE_OK && p->eStage==RBU_STAGE_CKPT ){
sqlite3_file *pDb = p->pTargetFd->pReal;
rc = pDb->pMethods->xSync(pDb, SQLITE_SYNC_NORMAL);
}
p->rc = rc;
rbuSaveState(p, p->eStage);
rc = p->rc;
if( p->eStage==RBU_STAGE_OAL ){
assert( rc!=SQLITE_DONE );
if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, 0);
if( rc==SQLITE_OK ){
const char *zBegin = rbuIsVacuum(p) ? "BEGIN" : "BEGIN IMMEDIATE";
rc = sqlite3_exec(p->dbRbu, zBegin, 0, 0, 0);
}
if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbMain, "BEGIN IMMEDIATE", 0, 0,0);
}
p->rc = rc;
return rc;
}
/*
** Default xRename callback for RBU.
*/
static int xDefaultRename(void *pArg, const char *zOld, const char *zNew){
int rc = SQLITE_OK;
#if defined(_WIN32_WCE)
{
LPWSTR zWideOld;
LPWSTR zWideNew;
zWideOld = rbuWinUtf8ToUnicode(zOld);
if( zWideOld ){
zWideNew = rbuWinUtf8ToUnicode(zNew);
if( zWideNew ){
if( MoveFileW(zWideOld, zWideNew) ){
rc = SQLITE_OK;
}else{
rc = SQLITE_IOERR;
}
sqlite3_free(zWideNew);
}else{
rc = SQLITE_IOERR_NOMEM;
}
sqlite3_free(zWideOld);
}else{
rc = SQLITE_IOERR_NOMEM;
}
}
#else
rc = rename(zOld, zNew) ? SQLITE_IOERR : SQLITE_OK;
#endif
return rc;
}
void sqlite3rbu_rename_handler(
sqlite3rbu *pRbu,
void *pArg,
int (*xRename)(void *pArg, const char *zOld, const char *zNew)
){
if( xRename ){
pRbu->xRename = xRename;
pRbu->pRenameArg = pArg;
}else{
pRbu->xRename = xDefaultRename;
pRbu->pRenameArg = 0;
}
}
/**************************************************************************
** Beginning of RBU VFS shim methods. The VFS shim modifies the behaviour
** of a standard VFS in the following ways:
**
** 1. Whenever the first page of a main database file is read or
** written, the value of the change-counter cookie is stored in
** rbu_file.iCookie. Similarly, the value of the "write-version"
** database header field is stored in rbu_file.iWriteVer. This ensures
** that the values are always trustworthy within an open transaction.
**
** 2. Whenever an SQLITE_OPEN_WAL file is opened, the (rbu_file.pWalFd)
** member variable of the associated database file descriptor is set
** to point to the new file. A mutex protected linked list of all main
** db fds opened using a particular RBU VFS is maintained at
** rbu_vfs.pMain to facilitate this.
**
** 3. Using a new file-control "SQLITE_FCNTL_RBU", a main db rbu_file
** object can be marked as the target database of an RBU update. This
** turns on the following extra special behaviour:
**
** 3a. If xAccess() is called to check if there exists a *-wal file
** associated with an RBU target database currently in RBU_STAGE_OAL
** stage (preparing the *-oal file), the following special handling
** applies:
**
** * if the *-wal file does exist, return SQLITE_CANTOPEN. An RBU
** target database may not be in wal mode already.
**
** * if the *-wal file does not exist, set the output parameter to
** non-zero (to tell SQLite that it does exist) anyway.
**
** Then, when xOpen() is called to open the *-wal file associated with
** the RBU target in RBU_STAGE_OAL stage, instead of opening the *-wal
** file, the rbu vfs opens the corresponding *-oal file instead.
**
** 3b. The *-shm pages returned by xShmMap() for a target db file in
** RBU_STAGE_OAL mode are actually stored in heap memory. This is to
** avoid creating a *-shm file on disk. Additionally, xShmLock() calls
** are no-ops on target database files in RBU_STAGE_OAL mode. This is
** because assert() statements in some VFS implementations fail if
** xShmLock() is called before xShmMap().
**
** 3c. If an EXCLUSIVE lock is attempted on a target database file in any
** mode except RBU_STAGE_DONE (all work completed and checkpointed), it
** fails with an SQLITE_BUSY error. This is to stop RBU connections
** from automatically checkpointing a *-wal (or *-oal) file from within
** sqlite3_close().
**
** 3d. In RBU_STAGE_CAPTURE mode, all xRead() calls on the wal file, and
** all xWrite() calls on the target database file perform no IO.
** Instead the frame and page numbers that would be read and written
** are recorded. Additionally, successful attempts to obtain exclusive
** xShmLock() WRITER, CHECKPOINTER and READ0 locks on the target
** database file are recorded. xShmLock() calls to unlock the same
** locks are no-ops (so that once obtained, these locks are never
** relinquished). Finally, calls to xSync() on the target database
** file fail with SQLITE_INTERNAL errors.
*/
static void rbuUnlockShm(rbu_file *p){
assert( p->openFlags & SQLITE_OPEN_MAIN_DB );
if( p->pRbu ){
int (*xShmLock)(sqlite3_file*,int,int,int) = p->pReal->pMethods->xShmLock;
int i;
for(i=0; i<SQLITE_SHM_NLOCK;i++){
if( (1<<i) & p->pRbu->mLock ){
xShmLock(p->pReal, i, 1, SQLITE_SHM_UNLOCK|SQLITE_SHM_EXCLUSIVE);
}
}
p->pRbu->mLock = 0;
}
}
/*
*/
static int rbuUpdateTempSize(rbu_file *pFd, sqlite3_int64 nNew){
sqlite3rbu *pRbu = pFd->pRbu;
i64 nDiff = nNew - pFd->sz;
pRbu->szTemp += nDiff;
pFd->sz = nNew;
assert( pRbu->szTemp>=0 );
if( pRbu->szTempLimit && pRbu->szTemp>pRbu->szTempLimit ) return SQLITE_FULL;
return SQLITE_OK;
}
/*
** Add an item to the main-db lists, if it is not already present.
**
** There are two main-db lists. One for all file descriptors, and one
** for all file descriptors with rbu_file.pDb!=0. If the argument has
** rbu_file.pDb!=0, then it is assumed to already be present on the
** main list and is only added to the pDb!=0 list.
*/
static void rbuMainlistAdd(rbu_file *p){
rbu_vfs *pRbuVfs = p->pRbuVfs;
rbu_file *pIter;
assert( (p->openFlags & SQLITE_OPEN_MAIN_DB) );
sqlite3_mutex_enter(pRbuVfs->mutex);
if( p->pRbu==0 ){
for(pIter=pRbuVfs->pMain; pIter; pIter=pIter->pMainNext);
p->pMainNext = pRbuVfs->pMain;
pRbuVfs->pMain = p;
}else{
for(pIter=pRbuVfs->pMainRbu; pIter && pIter!=p; pIter=pIter->pMainRbuNext){}
if( pIter==0 ){
p->pMainRbuNext = pRbuVfs->pMainRbu;
pRbuVfs->pMainRbu = p;
}
}
sqlite3_mutex_leave(pRbuVfs->mutex);
}
/*
** Remove an item from the main-db lists.
*/
static void rbuMainlistRemove(rbu_file *p){
rbu_file **pp;
sqlite3_mutex_enter(p->pRbuVfs->mutex);
for(pp=&p->pRbuVfs->pMain; *pp && *pp!=p; pp=&((*pp)->pMainNext)){}
if( *pp ) *pp = p->pMainNext;
p->pMainNext = 0;
for(pp=&p->pRbuVfs->pMainRbu; *pp && *pp!=p; pp=&((*pp)->pMainRbuNext)){}
if( *pp ) *pp = p->pMainRbuNext;
p->pMainRbuNext = 0;
sqlite3_mutex_leave(p->pRbuVfs->mutex);
}
/*
** Given that zWal points to a buffer containing a wal file name passed to
** either the xOpen() or xAccess() VFS method, search the main-db list for
** a file-handle opened by the same database connection on the corresponding
** database file.
**
** If parameter bRbu is true, only search for file-descriptors with
** rbu_file.pDb!=0.
*/
static rbu_file *rbuFindMaindb(rbu_vfs *pRbuVfs, const char *zWal, int bRbu){
rbu_file *pDb;
sqlite3_mutex_enter(pRbuVfs->mutex);
if( bRbu ){
for(pDb=pRbuVfs->pMainRbu; pDb && pDb->zWal!=zWal; pDb=pDb->pMainRbuNext){}
}else{
for(pDb=pRbuVfs->pMain; pDb && pDb->zWal!=zWal; pDb=pDb->pMainNext){}
}
sqlite3_mutex_leave(pRbuVfs->mutex);
return pDb;
}
/*
** Close an rbu file.
*/
static int rbuVfsClose(sqlite3_file *pFile){
rbu_file *p = (rbu_file*)pFile;
int rc;
int i;
/* Free the contents of the apShm[] array. And the array itself. */
for(i=0; i<p->nShm; i++){
sqlite3_free(p->apShm[i]);
}
sqlite3_free(p->apShm);
p->apShm = 0;
sqlite3_free(p->zDel);
if( p->openFlags & SQLITE_OPEN_MAIN_DB ){
rbuMainlistRemove(p);
rbuUnlockShm(p);
p->pReal->pMethods->xShmUnmap(p->pReal, 0);
}
else if( (p->openFlags & SQLITE_OPEN_DELETEONCLOSE) && p->pRbu ){
rbuUpdateTempSize(p, 0);
}
assert( p->pMainNext==0 && p->pRbuVfs->pMain!=p );
/* Close the underlying file handle */
rc = p->pReal->pMethods->xClose(p->pReal);
return rc;
}
/*
** Read and return an unsigned 32-bit big-endian integer from the buffer
** passed as the only argument.
*/
static u32 rbuGetU32(u8 *aBuf){
return ((u32)aBuf[0] << 24)
+ ((u32)aBuf[1] << 16)
+ ((u32)aBuf[2] << 8)
+ ((u32)aBuf[3]);
}
/*
** Write an unsigned 32-bit value in big-endian format to the supplied
** buffer.
*/
static void rbuPutU32(u8 *aBuf, u32 iVal){
aBuf[0] = (iVal >> 24) & 0xFF;
aBuf[1] = (iVal >> 16) & 0xFF;
aBuf[2] = (iVal >> 8) & 0xFF;
aBuf[3] = (iVal >> 0) & 0xFF;
}
static void rbuPutU16(u8 *aBuf, u16 iVal){
aBuf[0] = (iVal >> 8) & 0xFF;
aBuf[1] = (iVal >> 0) & 0xFF;
}
/*
** Read data from an rbuVfs-file.
*/
static int rbuVfsRead(
sqlite3_file *pFile,
void *zBuf,
int iAmt,
sqlite_int64 iOfst
){
rbu_file *p = (rbu_file*)pFile;
sqlite3rbu *pRbu = p->pRbu;
int rc;
if( pRbu && pRbu->eStage==RBU_STAGE_CAPTURE ){
assert( p->openFlags & SQLITE_OPEN_WAL );
rc = rbuCaptureWalRead(p->pRbu, iOfst, iAmt);
}else{
if( pRbu && pRbu->eStage==RBU_STAGE_OAL
&& (p->openFlags & SQLITE_OPEN_WAL)
&& iOfst>=pRbu->iOalSz
){
rc = SQLITE_OK;
memset(zBuf, 0, iAmt);
}else{
rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);
#if 1
/* If this is being called to read the first page of the target
** database as part of an rbu vacuum operation, synthesize the
** contents of the first page if it does not yet exist. Otherwise,
** SQLite will not check for a *-wal file. */
if( pRbu && rbuIsVacuum(pRbu)
&& rc==SQLITE_IOERR_SHORT_READ && iOfst==0
&& (p->openFlags & SQLITE_OPEN_MAIN_DB)
&& pRbu->rc==SQLITE_OK
){
sqlite3_file *pFd = (sqlite3_file*)pRbu->pRbuFd;
rc = pFd->pMethods->xRead(pFd, zBuf, iAmt, iOfst);
if( rc==SQLITE_OK ){
u8 *aBuf = (u8*)zBuf;
u32 iRoot = rbuGetU32(&aBuf[52]) ? 1 : 0;
rbuPutU32(&aBuf[52], iRoot); /* largest root page number */
rbuPutU32(&aBuf[36], 0); /* number of free pages */
rbuPutU32(&aBuf[32], 0); /* first page on free list trunk */
rbuPutU32(&aBuf[28], 1); /* size of db file in pages */
rbuPutU32(&aBuf[24], pRbu->pRbuFd->iCookie+1); /* Change counter */
if( iAmt>100 ){
memset(&aBuf[100], 0, iAmt-100);
rbuPutU16(&aBuf[105], iAmt & 0xFFFF);
aBuf[100] = 0x0D;
}
}
}
#endif
}
if( rc==SQLITE_OK && iOfst==0 && (p->openFlags & SQLITE_OPEN_MAIN_DB) ){
/* These look like magic numbers. But they are stable, as they are part
** of the definition of the SQLite file format, which may not change. */
u8 *pBuf = (u8*)zBuf;
p->iCookie = rbuGetU32(&pBuf[24]);
p->iWriteVer = pBuf[19];
}
}
return rc;
}
/*
** Write data to an rbuVfs-file.
*/
static int rbuVfsWrite(
sqlite3_file *pFile,
const void *zBuf,
int iAmt,
sqlite_int64 iOfst
){
rbu_file *p = (rbu_file*)pFile;
sqlite3rbu *pRbu = p->pRbu;
int rc;
if( pRbu && pRbu->eStage==RBU_STAGE_CAPTURE ){
assert( p->openFlags & SQLITE_OPEN_MAIN_DB );
rc = rbuCaptureDbWrite(p->pRbu, iOfst);
}else{
if( pRbu ){
if( pRbu->eStage==RBU_STAGE_OAL
&& (p->openFlags & SQLITE_OPEN_WAL)
&& iOfst>=pRbu->iOalSz
){
pRbu->iOalSz = iAmt + iOfst;
}else if( p->openFlags & SQLITE_OPEN_DELETEONCLOSE ){
i64 szNew = iAmt+iOfst;
if( szNew>p->sz ){
rc = rbuUpdateTempSize(p, szNew);
if( rc!=SQLITE_OK ) return rc;
}
}
}
rc = p->pReal->pMethods->xWrite(p->pReal, zBuf, iAmt, iOfst);
if( rc==SQLITE_OK && iOfst==0 && (p->openFlags & SQLITE_OPEN_MAIN_DB) ){
/* These look like magic numbers. But they are stable, as they are part
** of the definition of the SQLite file format, which may not change. */
u8 *pBuf = (u8*)zBuf;
p->iCookie = rbuGetU32(&pBuf[24]);
p->iWriteVer = pBuf[19];
}
}
return rc;
}
/*
** Truncate an rbuVfs-file.
*/
static int rbuVfsTruncate(sqlite3_file *pFile, sqlite_int64 size){
rbu_file *p = (rbu_file*)pFile;
if( (p->openFlags & SQLITE_OPEN_DELETEONCLOSE) && p->pRbu ){
int rc = rbuUpdateTempSize(p, size);
if( rc!=SQLITE_OK ) return rc;
}
return p->pReal->pMethods->xTruncate(p->pReal, size);
}
/*
** Sync an rbuVfs-file.
*/
static int rbuVfsSync(sqlite3_file *pFile, int flags){
rbu_file *p = (rbu_file *)pFile;
if( p->pRbu && p->pRbu->eStage==RBU_STAGE_CAPTURE ){
if( p->openFlags & SQLITE_OPEN_MAIN_DB ){
return SQLITE_INTERNAL;
}
return SQLITE_OK;
}
return p->pReal->pMethods->xSync(p->pReal, flags);
}
/*
** Return the current file-size of an rbuVfs-file.
*/
static int rbuVfsFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
rbu_file *p = (rbu_file *)pFile;
int rc;
rc = p->pReal->pMethods->xFileSize(p->pReal, pSize);
/* If this is an RBU vacuum operation and this is the target database,
** pretend that it has at least one page. Otherwise, SQLite will not
** check for the existance of a *-wal file. rbuVfsRead() contains
** similar logic. */
if( rc==SQLITE_OK && *pSize==0
&& p->pRbu && rbuIsVacuum(p->pRbu)
&& (p->openFlags & SQLITE_OPEN_MAIN_DB)
){
*pSize = 1024;
}
return rc;
}
/*
** Lock an rbuVfs-file.
*/
static int rbuVfsLock(sqlite3_file *pFile, int eLock){
rbu_file *p = (rbu_file*)pFile;
sqlite3rbu *pRbu = p->pRbu;
int rc = SQLITE_OK;
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
if( eLock==SQLITE_LOCK_EXCLUSIVE
&& (p->bNolock || (pRbu && pRbu->eStage!=RBU_STAGE_DONE))
){
/* Do not allow EXCLUSIVE locks. Preventing SQLite from taking this
** prevents it from checkpointing the database from sqlite3_close(). */
rc = SQLITE_BUSY;
}else{
rc = p->pReal->pMethods->xLock(p->pReal, eLock);
}
return rc;
}
/*
** Unlock an rbuVfs-file.
*/
static int rbuVfsUnlock(sqlite3_file *pFile, int eLock){
rbu_file *p = (rbu_file *)pFile;
return p->pReal->pMethods->xUnlock(p->pReal, eLock);
}
/*
** Check if another file-handle holds a RESERVED lock on an rbuVfs-file.
*/
static int rbuVfsCheckReservedLock(sqlite3_file *pFile, int *pResOut){
rbu_file *p = (rbu_file *)pFile;
return p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut);
}
/*
** File control method. For custom operations on an rbuVfs-file.
*/
static int rbuVfsFileControl(sqlite3_file *pFile, int op, void *pArg){
rbu_file *p = (rbu_file *)pFile;
int (*xControl)(sqlite3_file*,int,void*) = p->pReal->pMethods->xFileControl;
int rc;
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB)
|| p->openFlags & (SQLITE_OPEN_TRANSIENT_DB|SQLITE_OPEN_TEMP_JOURNAL)
);
if( op==SQLITE_FCNTL_RBU ){
sqlite3rbu *pRbu = (sqlite3rbu*)pArg;
/* First try to find another RBU vfs lower down in the vfs stack. If
** one is found, this vfs will operate in pass-through mode. The lower
** level vfs will do the special RBU handling. */
rc = xControl(p->pReal, op, pArg);
if( rc==SQLITE_NOTFOUND ){
/* Now search for a zipvfs instance lower down in the VFS stack. If
** one is found, this is an error. */
void *dummy = 0;
rc = xControl(p->pReal, SQLITE_FCNTL_ZIPVFS, &dummy);
if( rc==SQLITE_OK ){
rc = SQLITE_ERROR;
pRbu->zErrmsg = sqlite3_mprintf("rbu/zipvfs setup error");
}else if( rc==SQLITE_NOTFOUND ){
pRbu->pTargetFd = p;
p->pRbu = pRbu;
rbuMainlistAdd(p);
if( p->pWalFd ) p->pWalFd->pRbu = pRbu;
rc = SQLITE_OK;
}
}
return rc;
}
else if( op==SQLITE_FCNTL_RBUCNT ){
sqlite3rbu *pRbu = (sqlite3rbu*)pArg;
pRbu->nRbu++;
pRbu->pRbuFd = p;
p->bNolock = 1;
}
rc = xControl(p->pReal, op, pArg);
if( rc==SQLITE_OK && op==SQLITE_FCNTL_VFSNAME ){
rbu_vfs *pRbuVfs = p->pRbuVfs;
char *zIn = *(char**)pArg;
char *zOut = sqlite3_mprintf("rbu(%s)/%z", pRbuVfs->base.zName, zIn);
*(char**)pArg = zOut;
if( zOut==0 ) rc = SQLITE_NOMEM;
}
return rc;
}
/*
** Return the sector-size in bytes for an rbuVfs-file.
*/
static int rbuVfsSectorSize(sqlite3_file *pFile){
rbu_file *p = (rbu_file *)pFile;
return p->pReal->pMethods->xSectorSize(p->pReal);
}
/*
** Return the device characteristic flags supported by an rbuVfs-file.
*/
static int rbuVfsDeviceCharacteristics(sqlite3_file *pFile){
rbu_file *p = (rbu_file *)pFile;
return p->pReal->pMethods->xDeviceCharacteristics(p->pReal);
}
/*
** Take or release a shared-memory lock.
*/
static int rbuVfsShmLock(sqlite3_file *pFile, int ofst, int n, int flags){
rbu_file *p = (rbu_file*)pFile;
sqlite3rbu *pRbu = p->pRbu;
int rc = SQLITE_OK;
#ifdef SQLITE_AMALGAMATION
assert( WAL_CKPT_LOCK==1 );
#endif
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
if( pRbu && (
pRbu->eStage==RBU_STAGE_OAL
|| pRbu->eStage==RBU_STAGE_MOVE
|| pRbu->eStage==RBU_STAGE_DONE
)){
/* Prevent SQLite from taking a shm-lock on the target file when it
** is supplying heap memory to the upper layer in place of *-shm
** segments. */
if( ofst==WAL_LOCK_CKPT && n==1 ) rc = SQLITE_BUSY;
}else{
int bCapture = 0;
if( pRbu && pRbu->eStage==RBU_STAGE_CAPTURE ){
bCapture = 1;
}
if( bCapture==0 || 0==(flags & SQLITE_SHM_UNLOCK) ){
rc = p->pReal->pMethods->xShmLock(p->pReal, ofst, n, flags);
if( bCapture && rc==SQLITE_OK ){
pRbu->mLock |= ((1<<n) - 1) << ofst;
}
}
}
return rc;
}
/*
** Obtain a pointer to a mapping of a single 32KiB page of the *-shm file.
*/
static int rbuVfsShmMap(
sqlite3_file *pFile,
int iRegion,
int szRegion,
int isWrite,
void volatile **pp
){
rbu_file *p = (rbu_file*)pFile;
int rc = SQLITE_OK;
int eStage = (p->pRbu ? p->pRbu->eStage : 0);
/* If not in RBU_STAGE_OAL, allow this call to pass through. Or, if this
** rbu is in the RBU_STAGE_OAL state, use heap memory for *-shm space
** instead of a file on disk. */
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
if( eStage==RBU_STAGE_OAL ){
sqlite3_int64 nByte = (iRegion+1) * sizeof(char*);
char **apNew = (char**)sqlite3_realloc64(p->apShm, nByte);
/* This is an RBU connection that uses its own heap memory for the
** pages of the *-shm file. Since no other process can have run
** recovery, the connection must request *-shm pages in order
** from start to finish. */
assert( iRegion==p->nShm );
if( apNew==0 ){
rc = SQLITE_NOMEM;
}else{
memset(&apNew[p->nShm], 0, sizeof(char*) * (1 + iRegion - p->nShm));
p->apShm = apNew;
p->nShm = iRegion+1;
}
if( rc==SQLITE_OK ){
char *pNew = (char*)sqlite3_malloc64(szRegion);
if( pNew==0 ){
rc = SQLITE_NOMEM;
}else{
memset(pNew, 0, szRegion);
p->apShm[iRegion] = pNew;
}
}
if( rc==SQLITE_OK ){
*pp = p->apShm[iRegion];
}else{
*pp = 0;
}
}else{
assert( p->apShm==0 );
rc = p->pReal->pMethods->xShmMap(p->pReal, iRegion, szRegion, isWrite, pp);
}
return rc;
}
/*
** Memory barrier.
*/
static void rbuVfsShmBarrier(sqlite3_file *pFile){
rbu_file *p = (rbu_file *)pFile;
p->pReal->pMethods->xShmBarrier(p->pReal);
}
/*
** The xShmUnmap method.
*/
static int rbuVfsShmUnmap(sqlite3_file *pFile, int delFlag){
rbu_file *p = (rbu_file*)pFile;
int rc = SQLITE_OK;
int eStage = (p->pRbu ? p->pRbu->eStage : 0);
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
if( eStage==RBU_STAGE_OAL || eStage==RBU_STAGE_MOVE ){
/* no-op */
}else{
/* Release the checkpointer and writer locks */
rbuUnlockShm(p);
rc = p->pReal->pMethods->xShmUnmap(p->pReal, delFlag);
}
return rc;
}
/*
** Open an rbu file handle.
*/
static int rbuVfsOpen(
sqlite3_vfs *pVfs,
const char *zName,
sqlite3_file *pFile,
int flags,
int *pOutFlags
){
static sqlite3_io_methods rbuvfs_io_methods = {
2, /* iVersion */
rbuVfsClose, /* xClose */
rbuVfsRead, /* xRead */
rbuVfsWrite, /* xWrite */
rbuVfsTruncate, /* xTruncate */
rbuVfsSync, /* xSync */
rbuVfsFileSize, /* xFileSize */
rbuVfsLock, /* xLock */
rbuVfsUnlock, /* xUnlock */
rbuVfsCheckReservedLock, /* xCheckReservedLock */
rbuVfsFileControl, /* xFileControl */
rbuVfsSectorSize, /* xSectorSize */
rbuVfsDeviceCharacteristics, /* xDeviceCharacteristics */
rbuVfsShmMap, /* xShmMap */
rbuVfsShmLock, /* xShmLock */
rbuVfsShmBarrier, /* xShmBarrier */
rbuVfsShmUnmap, /* xShmUnmap */
0, 0 /* xFetch, xUnfetch */
};
rbu_vfs *pRbuVfs = (rbu_vfs*)pVfs;
sqlite3_vfs *pRealVfs = pRbuVfs->pRealVfs;
rbu_file *pFd = (rbu_file *)pFile;
int rc = SQLITE_OK;
const char *zOpen = zName;
int oflags = flags;
memset(pFd, 0, sizeof(rbu_file));
pFd->pReal = (sqlite3_file*)&pFd[1];
pFd->pRbuVfs = pRbuVfs;
pFd->openFlags = flags;
if( zName ){
if( flags & SQLITE_OPEN_MAIN_DB ){
/* A main database has just been opened. The following block sets
** (pFd->zWal) to point to a buffer owned by SQLite that contains
** the name of the *-wal file this db connection will use. SQLite
** happens to pass a pointer to this buffer when using xAccess()
** or xOpen() to operate on the *-wal file. */
pFd->zWal = sqlite3_filename_wal(zName);
}
else if( flags & SQLITE_OPEN_WAL ){
rbu_file *pDb = rbuFindMaindb(pRbuVfs, zName, 0);
if( pDb ){
if( pDb->pRbu && pDb->pRbu->eStage==RBU_STAGE_OAL ){
/* This call is to open a *-wal file. Intead, open the *-oal. */
size_t nOpen;
if( rbuIsVacuum(pDb->pRbu) ){
zOpen = sqlite3_db_filename(pDb->pRbu->dbRbu, "main");
zOpen = sqlite3_filename_wal(zOpen);
}
nOpen = strlen(zOpen);
((char*)zOpen)[nOpen-3] = 'o';
pFd->pRbu = pDb->pRbu;
}
pDb->pWalFd = pFd;
}
}
}else{
pFd->pRbu = pRbuVfs->pRbu;
}
if( oflags & SQLITE_OPEN_MAIN_DB
&& sqlite3_uri_boolean(zName, "rbu_memory", 0)
){
assert( oflags & SQLITE_OPEN_MAIN_DB );
oflags = SQLITE_OPEN_TEMP_DB | SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE |
SQLITE_OPEN_EXCLUSIVE | SQLITE_OPEN_DELETEONCLOSE;
zOpen = 0;
}
if( rc==SQLITE_OK ){
rc = pRealVfs->xOpen(pRealVfs, zOpen, pFd->pReal, oflags, pOutFlags);
}
if( pFd->pReal->pMethods ){
/* The xOpen() operation has succeeded. Set the sqlite3_file.pMethods
** pointer and, if the file is a main database file, link it into the
** mutex protected linked list of all such files. */
pFile->pMethods = &rbuvfs_io_methods;
if( flags & SQLITE_OPEN_MAIN_DB ){
rbuMainlistAdd(pFd);
}
}else{
sqlite3_free(pFd->zDel);
}
return rc;
}
/*
** Delete the file located at zPath.
*/
static int rbuVfsDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
return pRealVfs->xDelete(pRealVfs, zPath, dirSync);
}
/*
** Test for access permissions. Return true if the requested permission
** is available, or false otherwise.
*/
static int rbuVfsAccess(
sqlite3_vfs *pVfs,
const char *zPath,
int flags,
int *pResOut
){
rbu_vfs *pRbuVfs = (rbu_vfs*)pVfs;
sqlite3_vfs *pRealVfs = pRbuVfs->pRealVfs;
int rc;
rc = pRealVfs->xAccess(pRealVfs, zPath, flags, pResOut);
/* If this call is to check if a *-wal file associated with an RBU target
** database connection exists, and the RBU update is in RBU_STAGE_OAL,
** the following special handling is activated:
**
** a) if the *-wal file does exist, return SQLITE_CANTOPEN. This
** ensures that the RBU extension never tries to update a database
** in wal mode, even if the first page of the database file has
** been damaged.
**
** b) if the *-wal file does not exist, claim that it does anyway,
** causing SQLite to call xOpen() to open it. This call will also
** be intercepted (see the rbuVfsOpen() function) and the *-oal
** file opened instead.
*/
if( rc==SQLITE_OK && flags==SQLITE_ACCESS_EXISTS ){
rbu_file *pDb = rbuFindMaindb(pRbuVfs, zPath, 1);
if( pDb && pDb->pRbu->eStage==RBU_STAGE_OAL ){
assert( pDb->pRbu );
if( *pResOut ){
rc = SQLITE_CANTOPEN;
}else{
sqlite3_int64 sz = 0;
rc = rbuVfsFileSize(&pDb->base, &sz);
*pResOut = (sz>0);
}
}
}
return rc;
}
/*
** Populate buffer zOut with the full canonical pathname corresponding
** to the pathname in zPath. zOut is guaranteed to point to a buffer
** of at least (DEVSYM_MAX_PATHNAME+1) bytes.
*/
static int rbuVfsFullPathname(
sqlite3_vfs *pVfs,
const char *zPath,
int nOut,
char *zOut
){
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
return pRealVfs->xFullPathname(pRealVfs, zPath, nOut, zOut);
}
#ifndef SQLITE_OMIT_LOAD_EXTENSION
/*
** Open the dynamic library located at zPath and return a handle.
*/
static void *rbuVfsDlOpen(sqlite3_vfs *pVfs, const char *zPath){
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
return pRealVfs->xDlOpen(pRealVfs, zPath);
}
/*
** Populate the buffer zErrMsg (size nByte bytes) with a human readable
** utf-8 string describing the most recent error encountered associated
** with dynamic libraries.
*/
static void rbuVfsDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
pRealVfs->xDlError(pRealVfs, nByte, zErrMsg);
}
/*
** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
*/
static void (*rbuVfsDlSym(
sqlite3_vfs *pVfs,
void *pArg,
const char *zSym
))(void){
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
return pRealVfs->xDlSym(pRealVfs, pArg, zSym);
}
/*
** Close the dynamic library handle pHandle.
*/
static void rbuVfsDlClose(sqlite3_vfs *pVfs, void *pHandle){
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
pRealVfs->xDlClose(pRealVfs, pHandle);
}
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
/*
** Populate the buffer pointed to by zBufOut with nByte bytes of
** random data.
*/
static int rbuVfsRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
return pRealVfs->xRandomness(pRealVfs, nByte, zBufOut);
}
/*
** Sleep for nMicro microseconds. Return the number of microseconds
** actually slept.
*/
static int rbuVfsSleep(sqlite3_vfs *pVfs, int nMicro){
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
return pRealVfs->xSleep(pRealVfs, nMicro);
}
/*
** Return the current time as a Julian Day number in *pTimeOut.
*/
static int rbuVfsCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
return pRealVfs->xCurrentTime(pRealVfs, pTimeOut);
}
/*
** No-op.
*/
static int rbuVfsGetLastError(sqlite3_vfs *pVfs, int a, char *b){
return 0;
}
/*
** Deregister and destroy an RBU vfs created by an earlier call to
** sqlite3rbu_create_vfs().
*/
void sqlite3rbu_destroy_vfs(const char *zName){
sqlite3_vfs *pVfs = sqlite3_vfs_find(zName);
if( pVfs && pVfs->xOpen==rbuVfsOpen ){
sqlite3_mutex_free(((rbu_vfs*)pVfs)->mutex);
sqlite3_vfs_unregister(pVfs);
sqlite3_free(pVfs);
}
}
/*
** Create an RBU VFS named zName that accesses the underlying file-system
** via existing VFS zParent. The new object is registered as a non-default
** VFS with SQLite before returning.
*/
int sqlite3rbu_create_vfs(const char *zName, const char *zParent){
/* Template for VFS */
static sqlite3_vfs vfs_template = {
1, /* iVersion */
0, /* szOsFile */
0, /* mxPathname */
0, /* pNext */
0, /* zName */
0, /* pAppData */
rbuVfsOpen, /* xOpen */
rbuVfsDelete, /* xDelete */
rbuVfsAccess, /* xAccess */
rbuVfsFullPathname, /* xFullPathname */
#ifndef SQLITE_OMIT_LOAD_EXTENSION
rbuVfsDlOpen, /* xDlOpen */
rbuVfsDlError, /* xDlError */
rbuVfsDlSym, /* xDlSym */
rbuVfsDlClose, /* xDlClose */
#else
0, 0, 0, 0,
#endif
rbuVfsRandomness, /* xRandomness */
rbuVfsSleep, /* xSleep */
rbuVfsCurrentTime, /* xCurrentTime */
rbuVfsGetLastError, /* xGetLastError */
0, /* xCurrentTimeInt64 (version 2) */
0, 0, 0 /* Unimplemented version 3 methods */
};
rbu_vfs *pNew = 0; /* Newly allocated VFS */
int rc = SQLITE_OK;
size_t nName;
size_t nByte;
nName = strlen(zName);
nByte = sizeof(rbu_vfs) + nName + 1;
pNew = (rbu_vfs*)sqlite3_malloc64(nByte);
if( pNew==0 ){
rc = SQLITE_NOMEM;
}else{
sqlite3_vfs *pParent; /* Parent VFS */
memset(pNew, 0, nByte);
pParent = sqlite3_vfs_find(zParent);
if( pParent==0 ){
rc = SQLITE_NOTFOUND;
}else{
char *zSpace;
memcpy(&pNew->base, &vfs_template, sizeof(sqlite3_vfs));
pNew->base.mxPathname = pParent->mxPathname;
pNew->base.szOsFile = sizeof(rbu_file) + pParent->szOsFile;
pNew->pRealVfs = pParent;
pNew->base.zName = (const char*)(zSpace = (char*)&pNew[1]);
memcpy(zSpace, zName, nName);
/* Allocate the mutex and register the new VFS (not as the default) */
pNew->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_RECURSIVE);
if( pNew->mutex==0 ){
rc = SQLITE_NOMEM;
}else{
rc = sqlite3_vfs_register(&pNew->base, 0);
}
}
if( rc!=SQLITE_OK ){
sqlite3_mutex_free(pNew->mutex);
sqlite3_free(pNew);
}
}
return rc;
}
/*
** Configure the aggregate temp file size limit for this RBU handle.
*/
sqlite3_int64 sqlite3rbu_temp_size_limit(sqlite3rbu *pRbu, sqlite3_int64 n){
if( n>=0 ){
pRbu->szTempLimit = n;
}
return pRbu->szTempLimit;
}
sqlite3_int64 sqlite3rbu_temp_size(sqlite3rbu *pRbu){
return pRbu->szTemp;
}
/**************************************************************************/
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_RBU) */
| 172,268 | 5,374 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_aux.shell.c | #include "third_party/sqlite3/fts3_aux.c"
| 42 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3Int.h | /*
** 2009 Nov 12
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
*/
#ifndef _FTSINT_H
#define _FTSINT_H
#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
# define NDEBUG 1
#endif
/* FTS3/FTS4 require virtual tables */
#ifdef SQLITE_OMIT_VIRTUALTABLE
# undef SQLITE_ENABLE_FTS3
# undef SQLITE_ENABLE_FTS4
#endif
/*
** FTS4 is really an extension for FTS3. It is enabled using the
** SQLITE_ENABLE_FTS3 macro. But to avoid confusion we also all
** the SQLITE_ENABLE_FTS4 macro to serve as an alisse for SQLITE_ENABLE_FTS3.
*/
#if defined(SQLITE_ENABLE_FTS4) && !defined(SQLITE_ENABLE_FTS3)
# define SQLITE_ENABLE_FTS3
#endif
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
/* If not building as part of the core, include sqlite3ext.h. */
#ifndef SQLITE_CORE
# include "third_party/sqlite3/sqlite3ext.h"
SQLITE_EXTENSION_INIT3
#endif
#include "third_party/sqlite3/sqlite3.h"
#include "third_party/sqlite3/fts3_tokenizer.h"
#include "third_party/sqlite3/fts3_hash.h"
/*
** This constant determines the maximum depth of an FTS expression tree
** that the library will create and use. FTS uses recursion to perform
** various operations on the query tree, so the disadvantage of a large
** limit is that it may allow very large queries to use large amounts
** of stack space (perhaps causing a stack overflow).
*/
#ifndef SQLITE_FTS3_MAX_EXPR_DEPTH
# define SQLITE_FTS3_MAX_EXPR_DEPTH 12
#endif
/*
** This constant controls how often segments are merged. Once there are
** FTS3_MERGE_COUNT segments of level N, they are merged into a single
** segment of level N+1.
*/
#define FTS3_MERGE_COUNT 16
/*
** This is the maximum amount of data (in bytes) to store in the
** Fts3Table.pendingTerms hash table. Normally, the hash table is
** populated as documents are inserted/updated/deleted in a transaction
** and used to create a new segment when the transaction is committed.
** However if this limit is reached midway through a transaction, a new
** segment is created and the hash table cleared immediately.
*/
#define FTS3_MAX_PENDING_DATA (1*1024*1024)
/*
** Macro to return the number of elements in an array. SQLite has a
** similar macro called ArraySize(). Use a different name to avoid
** a collision when building an amalgamation with built-in FTS3.
*/
#define SizeofArray(X) ((int)(sizeof(X)/sizeof(X[0])))
#ifndef MIN
# define MIN(x,y) ((x)<(y)?(x):(y))
#endif
#ifndef MAX
# define MAX(x,y) ((x)>(y)?(x):(y))
#endif
/*
** Maximum length of a varint encoded integer. The varint format is different
** from that used by SQLite, so the maximum length is 10, not 9.
*/
#define FTS3_VARINT_MAX 10
#define FTS3_BUFFER_PADDING 8
/*
** FTS4 virtual tables may maintain multiple indexes - one index of all terms
** in the document set and zero or more prefix indexes. All indexes are stored
** as one or more b+-trees in the %_segments and %_segdir tables.
**
** It is possible to determine which index a b+-tree belongs to based on the
** value stored in the "%_segdir.level" column. Given this value L, the index
** that the b+-tree belongs to is (L<<10). In other words, all b+-trees with
** level values between 0 and 1023 (inclusive) belong to index 0, all levels
** between 1024 and 2047 to index 1, and so on.
**
** It is considered impossible for an index to use more than 1024 levels. In
** theory though this may happen, but only after at least
** (FTS3_MERGE_COUNT^1024) separate flushes of the pending-terms tables.
*/
#define FTS3_SEGDIR_MAXLEVEL 1024
#define FTS3_SEGDIR_MAXLEVEL_STR "1024"
/*
** The testcase() macro is only used by the amalgamation. If undefined,
** make it a no-op.
*/
#ifndef testcase
# define testcase(X)
#endif
/*
** Terminator values for position-lists and column-lists.
*/
#define POS_COLUMN (1) /* Column-list terminator */
#define POS_END (0) /* Position-list terminator */
/*
** The assert_fts3_nc() macro is similar to the assert() macro, except that it
** is used for assert() conditions that are true only if it can be
** guranteed that the database is not corrupt.
*/
#ifdef SQLITE_DEBUG
extern int sqlite3_fts3_may_be_corrupt;
# define assert_fts3_nc(x) assert(sqlite3_fts3_may_be_corrupt || (x))
#else
# define assert_fts3_nc(x) assert(x)
#endif
/*
** This section provides definitions to allow the
** FTS3 extension to be compiled outside of the
** amalgamation.
*/
#ifndef SQLITE_AMALGAMATION
/*
** Macros indicating that conditional expressions are always true or
** false.
*/
#if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_MUTATION_TEST)
# define SQLITE_OMIT_AUXILIARY_SAFETY_CHECKS 1
#endif
#if defined(SQLITE_OMIT_AUXILIARY_SAFETY_CHECKS)
# define ALWAYS(X) (1)
# define NEVER(X) (0)
#elif !defined(NDEBUG)
# define ALWAYS(X) ((X)?1:(assert(0),0))
# define NEVER(X) ((X)?(assert(0),1):0)
#else
# define ALWAYS(X) (X)
# define NEVER(X) (X)
#endif
/*
** Internal types used by SQLite.
*/
typedef unsigned char u8; /* 1-byte (or larger) unsigned integer */
typedef short int i16; /* 2-byte (or larger) signed integer */
typedef unsigned int u32; /* 4-byte unsigned integer */
typedef sqlite3_uint64 u64; /* 8-byte unsigned integer */
typedef sqlite3_int64 i64; /* 8-byte signed integer */
/*
** Macro used to suppress compiler warnings for unused parameters.
*/
#define UNUSED_PARAMETER(x) (void)(x)
/*
** Activate assert() only if SQLITE_TEST is enabled.
*/
#if !defined(NDEBUG) && !defined(SQLITE_DEBUG)
# define NDEBUG 1
#endif
/*
** The TESTONLY macro is used to enclose variable declarations or
** other bits of code that are needed to support the arguments
** within testcase() and assert() macros.
*/
#if defined(SQLITE_DEBUG) || defined(SQLITE_COVERAGE_TEST)
# define TESTONLY(X) X
#else
# define TESTONLY(X)
#endif
#define LARGEST_INT64 (0xffffffff|(((i64)0x7fffffff)<<32))
#define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)
#define deliberate_fall_through
#endif /* SQLITE_AMALGAMATION */
#ifdef SQLITE_DEBUG
int sqlite3Fts3Corrupt(void);
# define FTS_CORRUPT_VTAB sqlite3Fts3Corrupt()
#else
# define FTS_CORRUPT_VTAB SQLITE_CORRUPT_VTAB
#endif
typedef struct Fts3Table Fts3Table;
typedef struct Fts3Cursor Fts3Cursor;
typedef struct Fts3Expr Fts3Expr;
typedef struct Fts3Phrase Fts3Phrase;
typedef struct Fts3PhraseToken Fts3PhraseToken;
typedef struct Fts3Doclist Fts3Doclist;
typedef struct Fts3SegFilter Fts3SegFilter;
typedef struct Fts3DeferredToken Fts3DeferredToken;
typedef struct Fts3SegReader Fts3SegReader;
typedef struct Fts3MultiSegReader Fts3MultiSegReader;
typedef struct MatchinfoBuffer MatchinfoBuffer;
/*
** A connection to a fulltext index is an instance of the following
** structure. The xCreate and xConnect methods create an instance
** of this structure and xDestroy and xDisconnect free that instance.
** All other methods receive a pointer to the structure as one of their
** arguments.
*/
struct Fts3Table {
sqlite3_vtab base; /* Base class used by SQLite core */
sqlite3 *db; /* The database connection */
const char *zDb; /* logical database name */
const char *zName; /* virtual table name */
int nColumn; /* number of named columns in virtual table */
char **azColumn; /* column names. malloced */
u8 *abNotindexed; /* True for 'notindexed' columns */
sqlite3_tokenizer *pTokenizer; /* tokenizer for inserts and queries */
char *zContentTbl; /* content=xxx option, or NULL */
char *zLanguageid; /* languageid=xxx option, or NULL */
int nAutoincrmerge; /* Value configured by 'automerge' */
u32 nLeafAdd; /* Number of leaf blocks added this trans */
int bLock; /* Used to prevent recursive content= tbls */
/* Precompiled statements used by the implementation. Each of these
** statements is run and reset within a single virtual table API call.
*/
sqlite3_stmt *aStmt[40];
sqlite3_stmt *pSeekStmt; /* Cache for fts3CursorSeekStmt() */
char *zReadExprlist;
char *zWriteExprlist;
int nNodeSize; /* Soft limit for node size */
u8 bFts4; /* True for FTS4, false for FTS3 */
u8 bHasStat; /* True if %_stat table exists (2==unknown) */
u8 bHasDocsize; /* True if %_docsize table exists */
u8 bDescIdx; /* True if doclists are in reverse order */
u8 bIgnoreSavepoint; /* True to ignore xSavepoint invocations */
int nPgsz; /* Page size for host database */
char *zSegmentsTbl; /* Name of %_segments table */
sqlite3_blob *pSegments; /* Blob handle open on %_segments table */
/*
** The following array of hash tables is used to buffer pending index
** updates during transactions. All pending updates buffered at any one
** time must share a common language-id (see the FTS4 langid= feature).
** The current language id is stored in variable iPrevLangid.
**
** A single FTS4 table may have multiple full-text indexes. For each index
** there is an entry in the aIndex[] array. Index 0 is an index of all the
** terms that appear in the document set. Each subsequent index in aIndex[]
** is an index of prefixes of a specific length.
**
** Variable nPendingData contains an estimate the memory consumed by the
** pending data structures, including hash table overhead, but not including
** malloc overhead. When nPendingData exceeds nMaxPendingData, all hash
** tables are flushed to disk. Variable iPrevDocid is the docid of the most
** recently inserted record.
*/
int nIndex; /* Size of aIndex[] */
struct Fts3Index {
int nPrefix; /* Prefix length (0 for main terms index) */
Fts3Hash hPending; /* Pending terms table for this index */
} *aIndex;
int nMaxPendingData; /* Max pending data before flush to disk */
int nPendingData; /* Current bytes of pending data */
sqlite_int64 iPrevDocid; /* Docid of most recently inserted document */
int iPrevLangid; /* Langid of recently inserted document */
int bPrevDelete; /* True if last operation was a delete */
#if defined(SQLITE_DEBUG) || defined(SQLITE_COVERAGE_TEST)
/* State variables used for validating that the transaction control
** methods of the virtual table are called at appropriate times. These
** values do not contribute to FTS functionality; they are used for
** verifying the operation of the SQLite core.
*/
int inTransaction; /* True after xBegin but before xCommit/xRollback */
int mxSavepoint; /* Largest valid xSavepoint integer */
#endif
#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
/* True to disable the incremental doclist optimization. This is controled
** by special insert command 'test-no-incr-doclist'. */
int bNoIncrDoclist;
/* Number of segments in a level */
int nMergeCount;
#endif
};
/* Macro to find the number of segments to merge */
#if defined(SQLITE_DEBUG) || defined(SQLITE_TEST)
# define MergeCount(P) ((P)->nMergeCount)
#else
# define MergeCount(P) FTS3_MERGE_COUNT
#endif
/*
** When the core wants to read from the virtual table, it creates a
** virtual table cursor (an instance of the following structure) using
** the xOpen method. Cursors are destroyed using the xClose method.
*/
struct Fts3Cursor {
sqlite3_vtab_cursor base; /* Base class used by SQLite core */
i16 eSearch; /* Search strategy (see below) */
u8 isEof; /* True if at End Of Results */
u8 isRequireSeek; /* True if must seek pStmt to %_content row */
u8 bSeekStmt; /* True if pStmt is a seek */
sqlite3_stmt *pStmt; /* Prepared statement in use by the cursor */
Fts3Expr *pExpr; /* Parsed MATCH query string */
int iLangid; /* Language being queried for */
int nPhrase; /* Number of matchable phrases in query */
Fts3DeferredToken *pDeferred; /* Deferred search tokens, if any */
sqlite3_int64 iPrevId; /* Previous id read from aDoclist */
char *pNextId; /* Pointer into the body of aDoclist */
char *aDoclist; /* List of docids for full-text queries */
int nDoclist; /* Size of buffer at aDoclist */
u8 bDesc; /* True to sort in descending order */
int eEvalmode; /* An FTS3_EVAL_XX constant */
int nRowAvg; /* Average size of database rows, in pages */
sqlite3_int64 nDoc; /* Documents in table */
i64 iMinDocid; /* Minimum docid to return */
i64 iMaxDocid; /* Maximum docid to return */
int isMatchinfoNeeded; /* True when aMatchinfo[] needs filling in */
MatchinfoBuffer *pMIBuffer; /* Buffer for matchinfo data */
};
#define FTS3_EVAL_FILTER 0
#define FTS3_EVAL_NEXT 1
#define FTS3_EVAL_MATCHINFO 2
/*
** The Fts3Cursor.eSearch member is always set to one of the following.
** Actualy, Fts3Cursor.eSearch can be greater than or equal to
** FTS3_FULLTEXT_SEARCH. If so, then Fts3Cursor.eSearch - 2 is the index
** of the column to be searched. For example, in
**
** CREATE VIRTUAL TABLE ex1 USING fts3(a,b,c,d);
** SELECT docid FROM ex1 WHERE b MATCH 'one two three';
**
** Because the LHS of the MATCH operator is 2nd column "b",
** Fts3Cursor.eSearch will be set to FTS3_FULLTEXT_SEARCH+1. (+0 for a,
** +1 for b, +2 for c, +3 for d.) If the LHS of MATCH were "ex1"
** indicating that all columns should be searched,
** then eSearch would be set to FTS3_FULLTEXT_SEARCH+4.
*/
#define FTS3_FULLSCAN_SEARCH 0 /* Linear scan of %_content table */
#define FTS3_DOCID_SEARCH 1 /* Lookup by rowid on %_content table */
#define FTS3_FULLTEXT_SEARCH 2 /* Full-text index search */
/*
** The lower 16-bits of the sqlite3_index_info.idxNum value set by
** the xBestIndex() method contains the Fts3Cursor.eSearch value described
** above. The upper 16-bits contain a combination of the following
** bits, used to describe extra constraints on full-text searches.
*/
#define FTS3_HAVE_LANGID 0x00010000 /* languageid=? */
#define FTS3_HAVE_DOCID_GE 0x00020000 /* docid>=? */
#define FTS3_HAVE_DOCID_LE 0x00040000 /* docid<=? */
struct Fts3Doclist {
char *aAll; /* Array containing doclist (or NULL) */
int nAll; /* Size of a[] in bytes */
char *pNextDocid; /* Pointer to next docid */
sqlite3_int64 iDocid; /* Current docid (if pList!=0) */
int bFreeList; /* True if pList should be sqlite3_free()d */
char *pList; /* Pointer to position list following iDocid */
int nList; /* Length of position list */
};
/*
** A "phrase" is a sequence of one or more tokens that must match in
** sequence. A single token is the base case and the most common case.
** For a sequence of tokens contained in double-quotes (i.e. "one two three")
** nToken will be the number of tokens in the string.
*/
struct Fts3PhraseToken {
char *z; /* Text of the token */
int n; /* Number of bytes in buffer z */
int isPrefix; /* True if token ends with a "*" character */
int bFirst; /* True if token must appear at position 0 */
/* Variables above this point are populated when the expression is
** parsed (by code in fts3_expr.c). Below this point the variables are
** used when evaluating the expression. */
Fts3DeferredToken *pDeferred; /* Deferred token object for this token */
Fts3MultiSegReader *pSegcsr; /* Segment-reader for this token */
};
struct Fts3Phrase {
/* Cache of doclist for this phrase. */
Fts3Doclist doclist;
int bIncr; /* True if doclist is loaded incrementally */
int iDoclistToken;
/* Used by sqlite3Fts3EvalPhrasePoslist() if this is a descendent of an
** OR condition. */
char *pOrPoslist;
i64 iOrDocid;
/* Variables below this point are populated by fts3_expr.c when parsing
** a MATCH expression. Everything above is part of the evaluation phase.
*/
int nToken; /* Number of tokens in the phrase */
int iColumn; /* Index of column this phrase must match */
Fts3PhraseToken aToken[1]; /* One entry for each token in the phrase */
};
/*
** A tree of these objects forms the RHS of a MATCH operator.
**
** If Fts3Expr.eType is FTSQUERY_PHRASE and isLoaded is true, then aDoclist
** points to a malloced buffer, size nDoclist bytes, containing the results
** of this phrase query in FTS3 doclist format. As usual, the initial
** "Length" field found in doclists stored on disk is omitted from this
** buffer.
**
** Variable aMI is used only for FTSQUERY_NEAR nodes to store the global
** matchinfo data. If it is not NULL, it points to an array of size nCol*3,
** where nCol is the number of columns in the queried FTS table. The array
** is populated as follows:
**
** aMI[iCol*3 + 0] = Undefined
** aMI[iCol*3 + 1] = Number of occurrences
** aMI[iCol*3 + 2] = Number of rows containing at least one instance
**
** The aMI array is allocated using sqlite3_malloc(). It should be freed
** when the expression node is.
*/
struct Fts3Expr {
int eType; /* One of the FTSQUERY_XXX values defined below */
int nNear; /* Valid if eType==FTSQUERY_NEAR */
Fts3Expr *pParent; /* pParent->pLeft==this or pParent->pRight==this */
Fts3Expr *pLeft; /* Left operand */
Fts3Expr *pRight; /* Right operand */
Fts3Phrase *pPhrase; /* Valid if eType==FTSQUERY_PHRASE */
/* The following are used by the fts3_eval.c module. */
sqlite3_int64 iDocid; /* Current docid */
u8 bEof; /* True this expression is at EOF already */
u8 bStart; /* True if iDocid is valid */
u8 bDeferred; /* True if this expression is entirely deferred */
/* The following are used by the fts3_snippet.c module. */
int iPhrase; /* Index of this phrase in matchinfo() results */
u32 *aMI; /* See above */
};
/*
** Candidate values for Fts3Query.eType. Note that the order of the first
** four values is in order of precedence when parsing expressions. For
** example, the following:
**
** "a OR b AND c NOT d NEAR e"
**
** is equivalent to:
**
** "a OR (b AND (c NOT (d NEAR e)))"
*/
#define FTSQUERY_NEAR 1
#define FTSQUERY_NOT 2
#define FTSQUERY_AND 3
#define FTSQUERY_OR 4
#define FTSQUERY_PHRASE 5
/* fts3_write.c */
int sqlite3Fts3UpdateMethod(sqlite3_vtab*,int,sqlite3_value**,sqlite3_int64*);
int sqlite3Fts3PendingTermsFlush(Fts3Table *);
void sqlite3Fts3PendingTermsClear(Fts3Table *);
int sqlite3Fts3Optimize(Fts3Table *);
int sqlite3Fts3SegReaderNew(int, int, sqlite3_int64,
sqlite3_int64, sqlite3_int64, const char *, int, Fts3SegReader**);
int sqlite3Fts3SegReaderPending(
Fts3Table*,int,const char*,int,int,Fts3SegReader**);
void sqlite3Fts3SegReaderFree(Fts3SegReader *);
int sqlite3Fts3AllSegdirs(Fts3Table*, int, int, int, sqlite3_stmt **);
int sqlite3Fts3ReadBlock(Fts3Table*, sqlite3_int64, char **, int*, int*);
int sqlite3Fts3SelectDoctotal(Fts3Table *, sqlite3_stmt **);
int sqlite3Fts3SelectDocsize(Fts3Table *, sqlite3_int64, sqlite3_stmt **);
#ifndef SQLITE_DISABLE_FTS4_DEFERRED
void sqlite3Fts3FreeDeferredTokens(Fts3Cursor *);
int sqlite3Fts3DeferToken(Fts3Cursor *, Fts3PhraseToken *, int);
int sqlite3Fts3CacheDeferredDoclists(Fts3Cursor *);
void sqlite3Fts3FreeDeferredDoclists(Fts3Cursor *);
int sqlite3Fts3DeferredTokenList(Fts3DeferredToken *, char **, int *);
#else
# define sqlite3Fts3FreeDeferredTokens(x)
# define sqlite3Fts3DeferToken(x,y,z) SQLITE_OK
# define sqlite3Fts3CacheDeferredDoclists(x) SQLITE_OK
# define sqlite3Fts3FreeDeferredDoclists(x)
# define sqlite3Fts3DeferredTokenList(x,y,z) SQLITE_OK
#endif
void sqlite3Fts3SegmentsClose(Fts3Table *);
int sqlite3Fts3MaxLevel(Fts3Table *, int *);
/* Special values interpreted by sqlite3SegReaderCursor() */
#define FTS3_SEGCURSOR_PENDING -1
#define FTS3_SEGCURSOR_ALL -2
int sqlite3Fts3SegReaderStart(Fts3Table*, Fts3MultiSegReader*, Fts3SegFilter*);
int sqlite3Fts3SegReaderStep(Fts3Table *, Fts3MultiSegReader *);
void sqlite3Fts3SegReaderFinish(Fts3MultiSegReader *);
int sqlite3Fts3SegReaderCursor(Fts3Table *,
int, int, int, const char *, int, int, int, Fts3MultiSegReader *);
/* Flags allowed as part of the 4th argument to SegmentReaderIterate() */
#define FTS3_SEGMENT_REQUIRE_POS 0x00000001
#define FTS3_SEGMENT_IGNORE_EMPTY 0x00000002
#define FTS3_SEGMENT_COLUMN_FILTER 0x00000004
#define FTS3_SEGMENT_PREFIX 0x00000008
#define FTS3_SEGMENT_SCAN 0x00000010
#define FTS3_SEGMENT_FIRST 0x00000020
/* Type passed as 4th argument to SegmentReaderIterate() */
struct Fts3SegFilter {
const char *zTerm;
int nTerm;
int iCol;
int flags;
};
struct Fts3MultiSegReader {
/* Used internally by sqlite3Fts3SegReaderXXX() calls */
Fts3SegReader **apSegment; /* Array of Fts3SegReader objects */
int nSegment; /* Size of apSegment array */
int nAdvance; /* How many seg-readers to advance */
Fts3SegFilter *pFilter; /* Pointer to filter object */
char *aBuffer; /* Buffer to merge doclists in */
i64 nBuffer; /* Allocated size of aBuffer[] in bytes */
int iColFilter; /* If >=0, filter for this column */
int bRestart;
/* Used by fts3.c only. */
int nCost; /* Cost of running iterator */
int bLookup; /* True if a lookup of a single entry. */
/* Output values. Valid only after Fts3SegReaderStep() returns SQLITE_ROW. */
char *zTerm; /* Pointer to term buffer */
int nTerm; /* Size of zTerm in bytes */
char *aDoclist; /* Pointer to doclist buffer */
int nDoclist; /* Size of aDoclist[] in bytes */
};
int sqlite3Fts3Incrmerge(Fts3Table*,int,int);
#define fts3GetVarint32(p, piVal) ( \
(*(u8*)(p)&0x80) ? sqlite3Fts3GetVarint32(p, piVal) : (*piVal=*(u8*)(p), 1) \
)
/* fts3.c */
void sqlite3Fts3ErrMsg(char**,const char*,...);
int sqlite3Fts3PutVarint(char *, sqlite3_int64);
int sqlite3Fts3GetVarint(const char *, sqlite_int64 *);
int sqlite3Fts3GetVarintU(const char *, sqlite_uint64 *);
int sqlite3Fts3GetVarintBounded(const char*,const char*,sqlite3_int64*);
int sqlite3Fts3GetVarint32(const char *, int *);
int sqlite3Fts3VarintLen(sqlite3_uint64);
void sqlite3Fts3Dequote(char *);
void sqlite3Fts3DoclistPrev(int,char*,int,char**,sqlite3_int64*,int*,u8*);
int sqlite3Fts3EvalPhraseStats(Fts3Cursor *, Fts3Expr *, u32 *);
int sqlite3Fts3FirstFilter(sqlite3_int64, char *, int, char *);
void sqlite3Fts3CreateStatTable(int*, Fts3Table*);
int sqlite3Fts3EvalTestDeferred(Fts3Cursor *pCsr, int *pRc);
int sqlite3Fts3ReadInt(const char *z, int *pnOut);
/* fts3_tokenizer.c */
const char *sqlite3Fts3NextToken(const char *, int *);
int sqlite3Fts3InitHashTable(sqlite3 *, Fts3Hash *, const char *);
int sqlite3Fts3InitTokenizer(Fts3Hash *pHash, const char *,
sqlite3_tokenizer **, char **
);
int sqlite3Fts3IsIdChar(char);
/* fts3_snippet.c */
void sqlite3Fts3Offsets(sqlite3_context*, Fts3Cursor*);
void sqlite3Fts3Snippet(sqlite3_context *, Fts3Cursor *, const char *,
const char *, const char *, int, int
);
void sqlite3Fts3Matchinfo(sqlite3_context *, Fts3Cursor *, const char *);
void sqlite3Fts3MIBufferFree(MatchinfoBuffer *p);
/* fts3_expr.c */
int sqlite3Fts3ExprParse(sqlite3_tokenizer *, int,
char **, int, int, int, const char *, int, Fts3Expr **, char **
);
void sqlite3Fts3ExprFree(Fts3Expr *);
#ifdef SQLITE_TEST
int sqlite3Fts3ExprInitTestInterface(sqlite3 *db, Fts3Hash*);
int sqlite3Fts3InitTerm(sqlite3 *db);
#endif
void *sqlite3Fts3MallocZero(i64 nByte);
int sqlite3Fts3OpenTokenizer(sqlite3_tokenizer *, int, const char *, int,
sqlite3_tokenizer_cursor **
);
/* fts3_aux.c */
int sqlite3Fts3InitAux(sqlite3 *db);
void sqlite3Fts3EvalPhraseCleanup(Fts3Phrase *);
int sqlite3Fts3MsrIncrStart(
Fts3Table*, Fts3MultiSegReader*, int, const char*, int);
int sqlite3Fts3MsrIncrNext(
Fts3Table *, Fts3MultiSegReader *, sqlite3_int64 *, char **, int *);
int sqlite3Fts3EvalPhrasePoslist(Fts3Cursor *, Fts3Expr *, int iCol, char **);
int sqlite3Fts3MsrOvfl(Fts3Cursor *, Fts3MultiSegReader *, int *);
int sqlite3Fts3MsrIncrRestart(Fts3MultiSegReader *pCsr);
/* fts3_tokenize_vtab.c */
int sqlite3Fts3InitTok(sqlite3*, Fts3Hash *, void(*xDestroy)(void*));
/* fts3_unicode2.c (functions generated by parsing unicode text files) */
#ifndef SQLITE_DISABLE_FTS3_UNICODE
int sqlite3FtsUnicodeFold(int, int);
int sqlite3FtsUnicodeIsalnum(int);
int sqlite3FtsUnicodeIsdiacritic(int);
#endif
#endif /* !SQLITE_CORE || SQLITE_ENABLE_FTS3 */
#endif /* _FTSINT_H */
| 25,687 | 655 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/random.c | /*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains code to implement a pseudo-random number
** generator (PRNG) for SQLite.
**
** Random numbers are used by some of the database backends in order
** to generate random integer keys for tables or random filenames.
*/
#include "third_party/sqlite3/sqliteInt.h"
/* All threads share a single random number generator.
** This structure is the current state of the generator.
*/
static SQLITE_WSD struct sqlite3PrngType {
u32 s[16]; /* 64 bytes of chacha20 state */
u8 out[64]; /* Output bytes */
u8 n; /* Output bytes remaining */
} sqlite3Prng;
/* The RFC-7539 ChaCha20 block function
*/
#define ROTL(a,b) (((a) << (b)) | ((a) >> (32 - (b))))
#define QR(a, b, c, d) ( \
a += b, d ^= a, d = ROTL(d,16), \
c += d, b ^= c, b = ROTL(b,12), \
a += b, d ^= a, d = ROTL(d, 8), \
c += d, b ^= c, b = ROTL(b, 7))
static void chacha_block(u32 *out, const u32 *in){
int i;
u32 x[16];
memcpy(x, in, 64);
for(i=0; i<10; i++){
QR(x[0], x[4], x[ 8], x[12]);
QR(x[1], x[5], x[ 9], x[13]);
QR(x[2], x[6], x[10], x[14]);
QR(x[3], x[7], x[11], x[15]);
QR(x[0], x[5], x[10], x[15]);
QR(x[1], x[6], x[11], x[12]);
QR(x[2], x[7], x[ 8], x[13]);
QR(x[3], x[4], x[ 9], x[14]);
}
for(i=0; i<16; i++) out[i] = x[i]+in[i];
}
/*
** Return N random bytes.
*/
void sqlite3_randomness(int N, void *pBuf){
unsigned char *zBuf = pBuf;
/* The "wsdPrng" macro will resolve to the pseudo-random number generator
** state vector. If writable static data is unsupported on the target,
** we have to locate the state vector at run-time. In the more common
** case where writable static data is supported, wsdPrng can refer directly
** to the "sqlite3Prng" state vector declared above.
*/
#ifdef SQLITE_OMIT_WSD
struct sqlite3PrngType *p = &GLOBAL(struct sqlite3PrngType, sqlite3Prng);
# define wsdPrng p[0]
#else
# define wsdPrng sqlite3Prng
#endif
#if SQLITE_THREADSAFE
sqlite3_mutex *mutex;
#endif
#ifndef SQLITE_OMIT_AUTOINIT
if( sqlite3_initialize() ) return;
#endif
#if SQLITE_THREADSAFE
mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_PRNG);
#endif
sqlite3_mutex_enter(mutex);
if( N<=0 || pBuf==0 ){
wsdPrng.s[0] = 0;
sqlite3_mutex_leave(mutex);
return;
}
/* Initialize the state of the random number generator once,
** the first time this routine is called.
*/
if( wsdPrng.s[0]==0 ){
sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
static const u32 chacha20_init[] = {
0x61707865, 0x3320646e, 0x79622d32, 0x6b206574
};
memcpy(&wsdPrng.s[0], chacha20_init, 16);
if( NEVER(pVfs==0) ){
memset(&wsdPrng.s[4], 0, 44);
}else{
sqlite3OsRandomness(pVfs, 44, (char*)&wsdPrng.s[4]);
}
wsdPrng.s[15] = wsdPrng.s[12];
wsdPrng.s[12] = 0;
wsdPrng.n = 0;
}
assert( N>0 );
while( 1 /* exit by break */ ){
if( N<=wsdPrng.n ){
memcpy(zBuf, &wsdPrng.out[wsdPrng.n-N], N);
wsdPrng.n -= N;
break;
}
if( wsdPrng.n>0 ){
memcpy(zBuf, wsdPrng.out, wsdPrng.n);
N -= wsdPrng.n;
zBuf += wsdPrng.n;
}
wsdPrng.s[12]++;
chacha_block((u32*)wsdPrng.out, wsdPrng.s);
wsdPrng.n = 64;
}
sqlite3_mutex_leave(mutex);
}
#ifndef SQLITE_UNTESTABLE
/*
** For testing purposes, we sometimes want to preserve the state of
** PRNG and restore the PRNG to its saved state at a later time, or
** to reset the PRNG to its initial state. These routines accomplish
** those tasks.
**
** The sqlite3_test_control() interface calls these routines to
** control the PRNG.
*/
static SQLITE_WSD struct sqlite3PrngType sqlite3SavedPrng;
void sqlite3PrngSaveState(void){
memcpy(
&GLOBAL(struct sqlite3PrngType, sqlite3SavedPrng),
&GLOBAL(struct sqlite3PrngType, sqlite3Prng),
sizeof(sqlite3Prng)
);
}
void sqlite3PrngRestoreState(void){
memcpy(
&GLOBAL(struct sqlite3PrngType, sqlite3Prng),
&GLOBAL(struct sqlite3PrngType, sqlite3SavedPrng),
sizeof(sqlite3Prng)
);
}
#endif /* SQLITE_UNTESTABLE */
| 4,439 | 158 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/zipfile.c | /*
** 2017-12-26
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file implements a virtual table for reading and writing ZIP archive
** files.
**
** Usage example:
**
** SELECT name, sz, datetime(mtime,'unixepoch') FROM zipfile($filename);
**
** Current limitations:
**
** * No support for encryption
** * No support for ZIP archives spanning multiple files
** * No support for zip64 extensions
** * Only the "inflate/deflate" (zlib) compression method is supported
*/
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/s.h"
#include "third_party/sqlite3/sqlite3.h"
#include "third_party/sqlite3/sqlite3ext.h"
#include "third_party/zlib/zlib.h"
// clang-format off
typedef sqlite3_int64 i64;
typedef sqlite3_uint64 u64;
typedef unsigned char u8;
SQLITE_EXTENSION_INIT1
#ifndef SQLITE_OMIT_VIRTUALTABLE
/* typedef sqlite3_int64 i64; */
/* typedef unsigned char u8; */
typedef unsigned short u16;
typedef unsigned long u32;
#define MIN(a,b) ((a)<(b) ? (a) : (b))
#if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_MUTATION_TEST)
# define ALWAYS(X) (1)
# define NEVER(X) (0)
#elif !defined(NDEBUG)
# define ALWAYS(X) ((X)?1:(assert(0),0))
# define NEVER(X) ((X)?(assert(0),1):0)
#else
# define ALWAYS(X) (X)
# define NEVER(X) (X)
#endif
static const char ZIPFILE_SCHEMA[] =
"CREATE TABLE y("
"name PRIMARY KEY," /* 0: Name of file in zip archive */
"mode," /* 1: POSIX mode for file */
"mtime," /* 2: Last modification time (secs since 1970)*/
"sz," /* 3: Size of object */
"rawdata," /* 4: Raw data */
"data," /* 5: Uncompressed data */
"method," /* 6: Compression method (integer) */
"z HIDDEN" /* 7: Name of zip file */
") WITHOUT ROWID;";
#define ZIPFILE_F_COLUMN_IDX 7 /* Index of column "file" in the above */
#define ZIPFILE_BUFFER_SIZE (64*1024)
/*
** Magic numbers used to read and write zip files.
**
** ZIPFILE_NEWENTRY_MADEBY:
** Use this value for the "version-made-by" field in new zip file
** entries. The upper byte indicates "unix", and the lower byte
** indicates that the zip file matches pkzip specification 3.0.
** This is what info-zip seems to do.
**
** ZIPFILE_NEWENTRY_REQUIRED:
** Value for "version-required-to-extract" field of new entries.
** Version 2.0 is required to support folders and deflate compression.
**
** ZIPFILE_NEWENTRY_FLAGS:
** Value for "general-purpose-bit-flags" field of new entries. Bit
** 11 means "utf-8 filename and comment".
**
** ZIPFILE_SIGNATURE_CDS:
** First 4 bytes of a valid CDS record.
**
** ZIPFILE_SIGNATURE_LFH:
** First 4 bytes of a valid LFH record.
**
** ZIPFILE_SIGNATURE_EOCD
** First 4 bytes of a valid EOCD record.
*/
#define ZIPFILE_EXTRA_TIMESTAMP 0x5455
#define ZIPFILE_NEWENTRY_MADEBY ((3<<8) + 30)
#define ZIPFILE_NEWENTRY_REQUIRED 20
#define ZIPFILE_NEWENTRY_FLAGS 0x800
#define ZIPFILE_SIGNATURE_CDS 0x02014b50
#define ZIPFILE_SIGNATURE_LFH 0x04034b50
#define ZIPFILE_SIGNATURE_EOCD 0x06054b50
/*
** The sizes of the fixed-size part of each of the three main data
** structures in a zip archive.
*/
#define ZIPFILE_LFH_FIXED_SZ 30
#define ZIPFILE_EOCD_FIXED_SZ 22
#define ZIPFILE_CDS_FIXED_SZ 46
/*
*** 4.3.16 End of central directory record:
***
*** end of central dir signature 4 bytes (0x06054b50)
*** number of this disk 2 bytes
*** number of the disk with the
*** start of the central directory 2 bytes
*** total number of entries in the
*** central directory on this disk 2 bytes
*** total number of entries in
*** the central directory 2 bytes
*** size of the central directory 4 bytes
*** offset of start of central
*** directory with respect to
*** the starting disk number 4 bytes
*** .ZIP file comment length 2 bytes
*** .ZIP file comment (variable size)
*/
typedef struct ZipfileEOCD ZipfileEOCD;
struct ZipfileEOCD {
u16 iDisk;
u16 iFirstDisk;
u16 nEntry;
u16 nEntryTotal;
u32 nSize;
u32 iOffset;
};
/*
*** 4.3.12 Central directory structure:
***
*** ...
***
*** central file header signature 4 bytes (0x02014b50)
*** version made by 2 bytes
*** version needed to extract 2 bytes
*** general purpose bit flag 2 bytes
*** compression method 2 bytes
*** last mod file time 2 bytes
*** last mod file date 2 bytes
*** crc-32 4 bytes
*** compressed size 4 bytes
*** uncompressed size 4 bytes
*** file name length 2 bytes
*** extra field length 2 bytes
*** file comment length 2 bytes
*** disk number start 2 bytes
*** internal file attributes 2 bytes
*** external file attributes 4 bytes
*** relative offset of local header 4 bytes
*/
typedef struct ZipfileCDS ZipfileCDS;
struct ZipfileCDS {
u16 iVersionMadeBy;
u16 iVersionExtract;
u16 flags;
u16 iCompression;
u16 mTime;
u16 mDate;
u32 crc32;
u32 szCompressed;
u32 szUncompressed;
u16 nFile;
u16 nExtra;
u16 nComment;
u16 iDiskStart;
u16 iInternalAttr;
u32 iExternalAttr;
u32 iOffset;
char *zFile; /* Filename (sqlite3_malloc()) */
};
/*
*** 4.3.7 Local file header:
***
*** local file header signature 4 bytes (0x04034b50)
*** version needed to extract 2 bytes
*** general purpose bit flag 2 bytes
*** compression method 2 bytes
*** last mod file time 2 bytes
*** last mod file date 2 bytes
*** crc-32 4 bytes
*** compressed size 4 bytes
*** uncompressed size 4 bytes
*** file name length 2 bytes
*** extra field length 2 bytes
***
*/
typedef struct ZipfileLFH ZipfileLFH;
struct ZipfileLFH {
u16 iVersionExtract;
u16 flags;
u16 iCompression;
u16 mTime;
u16 mDate;
u32 crc32;
u32 szCompressed;
u32 szUncompressed;
u16 nFile;
u16 nExtra;
};
typedef struct ZipfileEntry ZipfileEntry;
struct ZipfileEntry {
ZipfileCDS cds; /* Parsed CDS record */
u32 mUnixTime; /* Modification time, in UNIX format */
u8 *aExtra; /* cds.nExtra+cds.nComment bytes of extra data */
i64 iDataOff; /* Offset to data in file (if aData==0) */
u8 *aData; /* cds.szCompressed bytes of compressed data */
ZipfileEntry *pNext; /* Next element in in-memory CDS */
};
/*
** Cursor type for zipfile tables.
*/
typedef struct ZipfileCsr ZipfileCsr;
struct ZipfileCsr {
sqlite3_vtab_cursor base; /* Base class - must be first */
i64 iId; /* Cursor ID */
u8 bEof; /* True when at EOF */
u8 bNoop; /* If next xNext() call is no-op */
/* Used outside of write transactions */
FILE *pFile; /* Zip file */
i64 iNextOff; /* Offset of next record in central directory */
ZipfileEOCD eocd; /* Parse of central directory record */
ZipfileEntry *pFreeEntry; /* Free this list when cursor is closed or reset */
ZipfileEntry *pCurrent; /* Current entry */
ZipfileCsr *pCsrNext; /* Next cursor on same virtual table */
};
typedef struct ZipfileTab ZipfileTab;
struct ZipfileTab {
sqlite3_vtab base; /* Base class - must be first */
char *zFile; /* Zip file this table accesses (may be NULL) */
sqlite3 *db; /* Host database connection */
u8 *aBuffer; /* Temporary buffer used for various tasks */
ZipfileCsr *pCsrList; /* List of cursors */
i64 iNextCsrid;
/* The following are used by write transactions only */
ZipfileEntry *pFirstEntry; /* Linked list of all files (if pWriteFd!=0) */
ZipfileEntry *pLastEntry; /* Last element in pFirstEntry list */
FILE *pWriteFd; /* File handle open on zip archive */
i64 szCurrent; /* Current size of zip archive */
i64 szOrig; /* Size of archive at start of transaction */
};
/*
** Set the error message contained in context ctx to the results of
** vprintf(zFmt, ...).
*/
static void zipfileCtxErrorMsg(sqlite3_context *ctx, const char *zFmt, ...){
char *zMsg = 0;
va_list ap;
va_start(ap, zFmt);
zMsg = sqlite3_vmprintf(zFmt, ap);
sqlite3_result_error(ctx, zMsg, -1);
sqlite3_free(zMsg);
va_end(ap);
}
/*
** If string zIn is quoted, dequote it in place. Otherwise, if the string
** is not quoted, do nothing.
*/
static void zipfileDequote(char *zIn){
char q = zIn[0];
if( q=='"' || q=='\'' || q=='`' || q=='[' ){
int iIn = 1;
int iOut = 0;
if( q=='[' ) q = ']';
while( ALWAYS(zIn[iIn]) ){
char c = zIn[iIn++];
if( c==q && zIn[iIn++]!=q ) break;
zIn[iOut++] = c;
}
zIn[iOut] = '\0';
}
}
/*
** Construct a new ZipfileTab virtual table object.
**
** argv[0] -> module name ("zipfile")
** argv[1] -> database name
** argv[2] -> table name
** argv[...] -> "column name" and other module argument fields.
*/
static int zipfileConnect(
sqlite3 *db,
void *pAux,
int argc, const char *const*argv,
sqlite3_vtab **ppVtab,
char **pzErr
){
int nByte = sizeof(ZipfileTab) + ZIPFILE_BUFFER_SIZE;
int nFile = 0;
const char *zFile = 0;
ZipfileTab *pNew = 0;
int rc;
/* If the table name is not "zipfile", require that the argument be
** specified. This stops zipfile tables from being created as:
**
** CREATE VIRTUAL TABLE zzz USING zipfile();
**
** It does not prevent:
**
** CREATE VIRTUAL TABLE zipfile USING zipfile();
*/
assert( 0==sqlite3_stricmp(argv[0], "zipfile") );
if( (0!=sqlite3_stricmp(argv[2], "zipfile") && argc<4) || argc>4 ){
*pzErr = sqlite3_mprintf("zipfile constructor requires one argument");
return SQLITE_ERROR;
}
if( argc>3 ){
zFile = argv[3];
nFile = (int)strlen(zFile)+1;
}
rc = sqlite3_declare_vtab(db, ZIPFILE_SCHEMA);
if( rc==SQLITE_OK ){
pNew = (ZipfileTab*)sqlite3_malloc64((sqlite3_int64)nByte+nFile);
if( pNew==0 ) return SQLITE_NOMEM;
memset(pNew, 0, nByte+nFile);
pNew->db = db;
pNew->aBuffer = (u8*)&pNew[1];
if( zFile ){
pNew->zFile = (char*)&pNew->aBuffer[ZIPFILE_BUFFER_SIZE];
memcpy(pNew->zFile, zFile, nFile);
zipfileDequote(pNew->zFile);
}
}
sqlite3_vtab_config(db, SQLITE_VTAB_DIRECTONLY);
*ppVtab = (sqlite3_vtab*)pNew;
return rc;
}
/*
** Free the ZipfileEntry structure indicated by the only argument.
*/
static void zipfileEntryFree(ZipfileEntry *p){
if( p ){
sqlite3_free(p->cds.zFile);
sqlite3_free(p);
}
}
/*
** Release resources that should be freed at the end of a write
** transaction.
*/
static void zipfileCleanupTransaction(ZipfileTab *pTab){
ZipfileEntry *pEntry;
ZipfileEntry *pNext;
if( pTab->pWriteFd ){
fclose(pTab->pWriteFd);
pTab->pWriteFd = 0;
}
for(pEntry=pTab->pFirstEntry; pEntry; pEntry=pNext){
pNext = pEntry->pNext;
zipfileEntryFree(pEntry);
}
pTab->pFirstEntry = 0;
pTab->pLastEntry = 0;
pTab->szCurrent = 0;
pTab->szOrig = 0;
}
/*
** This method is the destructor for zipfile vtab objects.
*/
static int zipfileDisconnect(sqlite3_vtab *pVtab){
zipfileCleanupTransaction((ZipfileTab*)pVtab);
sqlite3_free(pVtab);
return SQLITE_OK;
}
/*
** Constructor for a new ZipfileCsr object.
*/
static int zipfileOpen(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCsr){
ZipfileTab *pTab = (ZipfileTab*)p;
ZipfileCsr *pCsr;
pCsr = sqlite3_malloc(sizeof(*pCsr));
*ppCsr = (sqlite3_vtab_cursor*)pCsr;
if( pCsr==0 ){
return SQLITE_NOMEM;
}
memset(pCsr, 0, sizeof(*pCsr));
pCsr->iId = ++pTab->iNextCsrid;
pCsr->pCsrNext = pTab->pCsrList;
pTab->pCsrList = pCsr;
return SQLITE_OK;
}
/*
** Reset a cursor back to the state it was in when first returned
** by zipfileOpen().
*/
static void zipfileResetCursor(ZipfileCsr *pCsr){
ZipfileEntry *p;
ZipfileEntry *pNext;
pCsr->bEof = 0;
if( pCsr->pFile ){
fclose(pCsr->pFile);
pCsr->pFile = 0;
zipfileEntryFree(pCsr->pCurrent);
pCsr->pCurrent = 0;
}
for(p=pCsr->pFreeEntry; p; p=pNext){
pNext = p->pNext;
zipfileEntryFree(p);
}
}
/*
** Destructor for an ZipfileCsr.
*/
static int zipfileClose(sqlite3_vtab_cursor *cur){
ZipfileCsr *pCsr = (ZipfileCsr*)cur;
ZipfileTab *pTab = (ZipfileTab*)(pCsr->base.pVtab);
ZipfileCsr **pp;
zipfileResetCursor(pCsr);
/* Remove this cursor from the ZipfileTab.pCsrList list. */
for(pp=&pTab->pCsrList; *pp!=pCsr; pp=&((*pp)->pCsrNext));
*pp = pCsr->pCsrNext;
sqlite3_free(pCsr);
return SQLITE_OK;
}
/*
** Set the error message for the virtual table associated with cursor
** pCsr to the results of vprintf(zFmt, ...).
*/
static void zipfileTableErr(ZipfileTab *pTab, const char *zFmt, ...){
va_list ap;
va_start(ap, zFmt);
sqlite3_free(pTab->base.zErrMsg);
pTab->base.zErrMsg = sqlite3_vmprintf(zFmt, ap);
va_end(ap);
}
static void zipfileCursorErr(ZipfileCsr *pCsr, const char *zFmt, ...){
va_list ap;
va_start(ap, zFmt);
sqlite3_free(pCsr->base.pVtab->zErrMsg);
pCsr->base.pVtab->zErrMsg = sqlite3_vmprintf(zFmt, ap);
va_end(ap);
}
/*
** Read nRead bytes of data from offset iOff of file pFile into buffer
** aRead[]. Return SQLITE_OK if successful, or an SQLite error code
** otherwise.
**
** If an error does occur, output variable (*pzErrmsg) may be set to point
** to an English language error message. It is the responsibility of the
** caller to eventually free this buffer using
** sqlite3_free().
*/
static int zipfileReadData(
FILE *pFile, /* Read from this file */
u8 *aRead, /* Read into this buffer */
int nRead, /* Number of bytes to read */
i64 iOff, /* Offset to read from */
char **pzErrmsg /* OUT: Error message (from sqlite3_malloc) */
){
size_t n;
fseek(pFile, (long)iOff, SEEK_SET);
n = fread(aRead, 1, nRead, pFile);
if( (int)n!=nRead ){
*pzErrmsg = sqlite3_mprintf("error in fread()");
return SQLITE_ERROR;
}
return SQLITE_OK;
}
static int zipfileAppendData(
ZipfileTab *pTab,
const u8 *aWrite,
int nWrite
){
if( nWrite>0 ){
size_t n = nWrite;
fseek(pTab->pWriteFd, (long)pTab->szCurrent, SEEK_SET);
n = fwrite(aWrite, 1, nWrite, pTab->pWriteFd);
if( (int)n!=nWrite ){
pTab->base.zErrMsg = sqlite3_mprintf("error in fwrite()");
return SQLITE_ERROR;
}
pTab->szCurrent += nWrite;
}
return SQLITE_OK;
}
/*
** Read and return a 16-bit little-endian unsigned integer from buffer aBuf.
*/
static u16 zipfileGetU16(const u8 *aBuf){
return (aBuf[1] << 8) + aBuf[0];
}
/*
** Read and return a 32-bit little-endian unsigned integer from buffer aBuf.
*/
static u32 zipfileGetU32(const u8 *aBuf){
return ((u32)(aBuf[3]) << 24)
+ ((u32)(aBuf[2]) << 16)
+ ((u32)(aBuf[1]) << 8)
+ ((u32)(aBuf[0]) << 0);
}
/*
** Write a 16-bit little endiate integer into buffer aBuf.
*/
static void zipfilePutU16(u8 *aBuf, u16 val){
aBuf[0] = val & 0xFF;
aBuf[1] = (val>>8) & 0xFF;
}
/*
** Write a 32-bit little endiate integer into buffer aBuf.
*/
static void zipfilePutU32(u8 *aBuf, u32 val){
aBuf[0] = val & 0xFF;
aBuf[1] = (val>>8) & 0xFF;
aBuf[2] = (val>>16) & 0xFF;
aBuf[3] = (val>>24) & 0xFF;
}
#define zipfileRead32(aBuf) ( aBuf+=4, zipfileGetU32(aBuf-4) )
#define zipfileRead16(aBuf) ( aBuf+=2, zipfileGetU16(aBuf-2) )
#define zipfileWrite32(aBuf,val) { zipfilePutU32(aBuf,val); aBuf+=4; }
#define zipfileWrite16(aBuf,val) { zipfilePutU16(aBuf,val); aBuf+=2; }
/*
** Magic numbers used to read CDS records.
*/
#define ZIPFILE_CDS_NFILE_OFF 28
#define ZIPFILE_CDS_SZCOMPRESSED_OFF 20
/*
** Decode the CDS record in buffer aBuf into (*pCDS). Return SQLITE_ERROR
** if the record is not well-formed, or SQLITE_OK otherwise.
*/
static int zipfileReadCDS(u8 *aBuf, ZipfileCDS *pCDS){
u8 *aRead = aBuf;
u32 sig = zipfileRead32(aRead);
int rc = SQLITE_OK;
if( sig!=ZIPFILE_SIGNATURE_CDS ){
rc = SQLITE_ERROR;
}else{
pCDS->iVersionMadeBy = zipfileRead16(aRead);
pCDS->iVersionExtract = zipfileRead16(aRead);
pCDS->flags = zipfileRead16(aRead);
pCDS->iCompression = zipfileRead16(aRead);
pCDS->mTime = zipfileRead16(aRead);
pCDS->mDate = zipfileRead16(aRead);
pCDS->crc32 = zipfileRead32(aRead);
pCDS->szCompressed = zipfileRead32(aRead);
pCDS->szUncompressed = zipfileRead32(aRead);
assert( aRead==&aBuf[ZIPFILE_CDS_NFILE_OFF] );
pCDS->nFile = zipfileRead16(aRead);
pCDS->nExtra = zipfileRead16(aRead);
pCDS->nComment = zipfileRead16(aRead);
pCDS->iDiskStart = zipfileRead16(aRead);
pCDS->iInternalAttr = zipfileRead16(aRead);
pCDS->iExternalAttr = zipfileRead32(aRead);
pCDS->iOffset = zipfileRead32(aRead);
assert( aRead==&aBuf[ZIPFILE_CDS_FIXED_SZ] );
}
return rc;
}
/*
** Decode the LFH record in buffer aBuf into (*pLFH). Return SQLITE_ERROR
** if the record is not well-formed, or SQLITE_OK otherwise.
*/
static int zipfileReadLFH(
u8 *aBuffer,
ZipfileLFH *pLFH
){
u8 *aRead = aBuffer;
int rc = SQLITE_OK;
u32 sig = zipfileRead32(aRead);
if( sig!=ZIPFILE_SIGNATURE_LFH ){
rc = SQLITE_ERROR;
}else{
pLFH->iVersionExtract = zipfileRead16(aRead);
pLFH->flags = zipfileRead16(aRead);
pLFH->iCompression = zipfileRead16(aRead);
pLFH->mTime = zipfileRead16(aRead);
pLFH->mDate = zipfileRead16(aRead);
pLFH->crc32 = zipfileRead32(aRead);
pLFH->szCompressed = zipfileRead32(aRead);
pLFH->szUncompressed = zipfileRead32(aRead);
pLFH->nFile = zipfileRead16(aRead);
pLFH->nExtra = zipfileRead16(aRead);
}
return rc;
}
/*
** Buffer aExtra (size nExtra bytes) contains zip archive "extra" fields.
** Scan through this buffer to find an "extra-timestamp" field. If one
** exists, extract the 32-bit modification-timestamp from it and store
** the value in output parameter *pmTime.
**
** Zero is returned if no extra-timestamp record could be found (and so
** *pmTime is left unchanged), or non-zero otherwise.
**
** The general format of an extra field is:
**
** Header ID 2 bytes
** Data Size 2 bytes
** Data N bytes
*/
static int zipfileScanExtra(u8 *aExtra, int nExtra, u32 *pmTime){
int ret = 0;
u8 *p = aExtra;
u8 *pEnd = &aExtra[nExtra];
while( p<pEnd ){
u16 id = zipfileRead16(p);
u16 nByte = zipfileRead16(p);
switch( id ){
case ZIPFILE_EXTRA_TIMESTAMP: {
u8 b = p[0];
if( b & 0x01 ){ /* 0x01 -> modtime is present */
*pmTime = zipfileGetU32(&p[1]);
ret = 1;
}
break;
}
}
p += nByte;
}
return ret;
}
/*
** Convert the standard MS-DOS timestamp stored in the mTime and mDate
** fields of the CDS structure passed as the only argument to a 32-bit
** UNIX seconds-since-the-epoch timestamp. Return the result.
**
** "Standard" MS-DOS time format:
**
** File modification time:
** Bits 00-04: seconds divided by 2
** Bits 05-10: minute
** Bits 11-15: hour
** File modification date:
** Bits 00-04: day
** Bits 05-08: month (1-12)
** Bits 09-15: years from 1980
**
** https://msdn.microsoft.com/en-us/library/9kkf9tah.aspx
*/
static u32 zipfileMtime(ZipfileCDS *pCDS){
int Y = (1980 + ((pCDS->mDate >> 9) & 0x7F));
int M = ((pCDS->mDate >> 5) & 0x0F);
int D = (pCDS->mDate & 0x1F);
int B = -13;
int sec = (pCDS->mTime & 0x1F)*2;
int min = (pCDS->mTime >> 5) & 0x3F;
int hr = (pCDS->mTime >> 11) & 0x1F;
i64 JD;
/* JD = INT(365.25 * (Y+4716)) + INT(30.6001 * (M+1)) + D + B - 1524.5 */
/* Calculate the JD in seconds for noon on the day in question */
if( M<3 ){
Y = Y-1;
M = M+12;
}
JD = (i64)(24*60*60) * (
(int)(365.25 * (Y + 4716))
+ (int)(30.6001 * (M + 1))
+ D + B - 1524
);
/* Correct the JD for the time within the day */
JD += (hr-12) * 3600 + min * 60 + sec;
/* Convert JD to unix timestamp (the JD epoch is 2440587.5) */
return (u32)(JD - (i64)(24405875) * 24*60*6);
}
/*
** The opposite of zipfileMtime(). This function populates the mTime and
** mDate fields of the CDS structure passed as the first argument according
** to the UNIX timestamp value passed as the second.
*/
static void zipfileMtimeToDos(ZipfileCDS *pCds, u32 mUnixTime){
/* Convert unix timestamp to JD (2440588 is noon on 1/1/1970) */
i64 JD = (i64)2440588 + mUnixTime / (24*60*60);
int A, B, C, D, E;
int yr, mon, day;
int hr, min, sec;
A = (int)((JD - 1867216.25)/36524.25);
A = (int)(JD + 1 + A - (A/4));
B = A + 1524;
C = (int)((B - 122.1)/365.25);
D = (36525*(C&32767))/100;
E = (int)((B-D)/30.6001);
day = B - D - (int)(30.6001*E);
mon = (E<14 ? E-1 : E-13);
yr = mon>2 ? C-4716 : C-4715;
hr = (mUnixTime % (24*60*60)) / (60*60);
min = (mUnixTime % (60*60)) / 60;
sec = (mUnixTime % 60);
if( yr>=1980 ){
pCds->mDate = (u16)(day + (mon << 5) + ((yr-1980) << 9));
pCds->mTime = (u16)(sec/2 + (min<<5) + (hr<<11));
}else{
pCds->mDate = pCds->mTime = 0;
}
assert( mUnixTime<315507600
|| mUnixTime==zipfileMtime(pCds)
|| ((mUnixTime % 2) && mUnixTime-1==zipfileMtime(pCds))
/* || (mUnixTime % 2) */
);
}
/*
** If aBlob is not NULL, then it is a pointer to a buffer (nBlob bytes in
** size) containing an entire zip archive image. Or, if aBlob is NULL,
** then pFile is a file-handle open on a zip file. In either case, this
** function creates a ZipfileEntry object based on the zip archive entry
** for which the CDS record is at offset iOff.
**
** If successful, SQLITE_OK is returned and (*ppEntry) set to point to
** the new object. Otherwise, an SQLite error code is returned and the
** final value of (*ppEntry) undefined.
*/
static int zipfileGetEntry(
ZipfileTab *pTab, /* Store any error message here */
const u8 *aBlob, /* Pointer to in-memory file image */
int nBlob, /* Size of aBlob[] in bytes */
FILE *pFile, /* If aBlob==0, read from this file */
i64 iOff, /* Offset of CDS record */
ZipfileEntry **ppEntry /* OUT: Pointer to new object */
){
u8 *aRead;
char **pzErr = &pTab->base.zErrMsg;
int rc = SQLITE_OK;
if( aBlob==0 ){
aRead = pTab->aBuffer;
rc = zipfileReadData(pFile, aRead, ZIPFILE_CDS_FIXED_SZ, iOff, pzErr);
}else{
aRead = (u8*)&aBlob[iOff];
}
if( rc==SQLITE_OK ){
sqlite3_int64 nAlloc;
ZipfileEntry *pNew;
int nFile = zipfileGetU16(&aRead[ZIPFILE_CDS_NFILE_OFF]);
int nExtra = zipfileGetU16(&aRead[ZIPFILE_CDS_NFILE_OFF+2]);
nExtra += zipfileGetU16(&aRead[ZIPFILE_CDS_NFILE_OFF+4]);
nAlloc = sizeof(ZipfileEntry) + nExtra;
if( aBlob ){
nAlloc += zipfileGetU32(&aRead[ZIPFILE_CDS_SZCOMPRESSED_OFF]);
}
pNew = (ZipfileEntry*)sqlite3_malloc64(nAlloc);
if( pNew==0 ){
rc = SQLITE_NOMEM;
}else{
memset(pNew, 0, sizeof(ZipfileEntry));
rc = zipfileReadCDS(aRead, &pNew->cds);
if( rc!=SQLITE_OK ){
*pzErr = sqlite3_mprintf("failed to read CDS at offset %lld", iOff);
}else if( aBlob==0 ){
rc = zipfileReadData(
pFile, aRead, nExtra+nFile, iOff+ZIPFILE_CDS_FIXED_SZ, pzErr
);
}else{
aRead = (u8*)&aBlob[iOff + ZIPFILE_CDS_FIXED_SZ];
}
}
if( rc==SQLITE_OK ){
u32 *pt = &pNew->mUnixTime;
pNew->cds.zFile = sqlite3_mprintf("%.*s", nFile, aRead);
pNew->aExtra = (u8*)&pNew[1];
memcpy(pNew->aExtra, &aRead[nFile], nExtra);
if( pNew->cds.zFile==0 ){
rc = SQLITE_NOMEM;
}else if( 0==zipfileScanExtra(&aRead[nFile], pNew->cds.nExtra, pt) ){
pNew->mUnixTime = zipfileMtime(&pNew->cds);
}
}
if( rc==SQLITE_OK ){
static const int szFix = ZIPFILE_LFH_FIXED_SZ;
ZipfileLFH lfh;
if( pFile ){
rc = zipfileReadData(pFile, aRead, szFix, pNew->cds.iOffset, pzErr);
}else{
aRead = (u8*)&aBlob[pNew->cds.iOffset];
}
rc = zipfileReadLFH(aRead, &lfh);
if( rc==SQLITE_OK ){
pNew->iDataOff = pNew->cds.iOffset + ZIPFILE_LFH_FIXED_SZ;
pNew->iDataOff += lfh.nFile + lfh.nExtra;
if( aBlob && pNew->cds.szCompressed ){
pNew->aData = &pNew->aExtra[nExtra];
memcpy(pNew->aData, &aBlob[pNew->iDataOff], pNew->cds.szCompressed);
}
}else{
*pzErr = sqlite3_mprintf("failed to read LFH at offset %d",
(int)pNew->cds.iOffset
);
}
}
if( rc!=SQLITE_OK ){
zipfileEntryFree(pNew);
}else{
*ppEntry = pNew;
}
}
return rc;
}
/*
** Advance an ZipfileCsr to its next row of output.
*/
static int zipfileNext(sqlite3_vtab_cursor *cur){
ZipfileCsr *pCsr = (ZipfileCsr*)cur;
int rc = SQLITE_OK;
if( pCsr->pFile ){
i64 iEof = pCsr->eocd.iOffset + pCsr->eocd.nSize;
zipfileEntryFree(pCsr->pCurrent);
pCsr->pCurrent = 0;
if( pCsr->iNextOff>=iEof ){
pCsr->bEof = 1;
}else{
ZipfileEntry *p = 0;
ZipfileTab *pTab = (ZipfileTab*)(cur->pVtab);
rc = zipfileGetEntry(pTab, 0, 0, pCsr->pFile, pCsr->iNextOff, &p);
if( rc==SQLITE_OK ){
pCsr->iNextOff += ZIPFILE_CDS_FIXED_SZ;
pCsr->iNextOff += (int)p->cds.nExtra + p->cds.nFile + p->cds.nComment;
}
pCsr->pCurrent = p;
}
}else{
if( !pCsr->bNoop ){
pCsr->pCurrent = pCsr->pCurrent->pNext;
}
if( pCsr->pCurrent==0 ){
pCsr->bEof = 1;
}
}
pCsr->bNoop = 0;
return rc;
}
static void zipfileFree(void *p) {
sqlite3_free(p);
}
/*
** Buffer aIn (size nIn bytes) contains compressed data. Uncompressed, the
** size is nOut bytes. This function uncompresses the data and sets the
** return value in context pCtx to the result (a blob).
**
** If an error occurs, an error code is left in pCtx instead.
*/
static void zipfileInflate(
sqlite3_context *pCtx, /* Store result here */
const u8 *aIn, /* Compressed data */
int nIn, /* Size of buffer aIn[] in bytes */
int nOut /* Expected output size */
){
u8 *aRes = sqlite3_malloc(nOut);
if( aRes==0 ){
sqlite3_result_error_nomem(pCtx);
}else{
int err;
z_stream str;
memset(&str, 0, sizeof(str));
str.next_in = (Byte*)aIn;
str.avail_in = nIn;
str.next_out = (Byte*)aRes;
str.avail_out = nOut;
err = inflateInit2(&str, -15);
if( err!=Z_OK ){
zipfileCtxErrorMsg(pCtx, "inflateInit2() failed (%d)", err);
}else{
err = inflate(&str, Z_NO_FLUSH);
if( err!=Z_STREAM_END ){
zipfileCtxErrorMsg(pCtx, "inflate() failed (%d)", err);
}else{
sqlite3_result_blob(pCtx, aRes, nOut, zipfileFree);
aRes = 0;
}
}
sqlite3_free(aRes);
inflateEnd(&str);
}
}
/*
** Buffer aIn (size nIn bytes) contains uncompressed data. This function
** compresses it and sets (*ppOut) to point to a buffer containing the
** compressed data. The caller is responsible for eventually calling
** sqlite3_free() to release buffer (*ppOut). Before returning, (*pnOut)
** is set to the size of buffer (*ppOut) in bytes.
**
** If no error occurs, SQLITE_OK is returned. Otherwise, an SQLite error
** code is returned and an error message left in virtual-table handle
** pTab. The values of (*ppOut) and (*pnOut) are left unchanged in this
** case.
*/
static int zipfileDeflate(
const u8 *aIn, int nIn, /* Input */
u8 **ppOut, int *pnOut, /* Output */
char **pzErr /* OUT: Error message */
){
int rc = SQLITE_OK;
sqlite3_int64 nAlloc;
z_stream str;
u8 *aOut;
memset(&str, 0, sizeof(str));
str.next_in = (Bytef*)aIn;
str.avail_in = nIn;
deflateInit2(&str, 9, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY);
nAlloc = deflateBound(&str, nIn);
aOut = (u8*)sqlite3_malloc64(nAlloc);
if( aOut==0 ){
rc = SQLITE_NOMEM;
}else{
int res;
str.next_out = aOut;
str.avail_out = nAlloc;
res = deflate(&str, Z_FINISH);
if( res==Z_STREAM_END ){
*ppOut = aOut;
*pnOut = (int)str.total_out;
}else{
sqlite3_free(aOut);
*pzErr = sqlite3_mprintf("zipfile: deflate() error");
rc = SQLITE_ERROR;
}
deflateEnd(&str);
}
return rc;
}
/*
** Return values of columns for the row at which the series_cursor
** is currently pointing.
*/
static int zipfileColumn(
sqlite3_vtab_cursor *cur, /* The cursor */
sqlite3_context *ctx, /* First argument to sqlite3_result_...() */
int i /* Which column to return */
){
ZipfileCsr *pCsr = (ZipfileCsr*)cur;
ZipfileCDS *pCDS = &pCsr->pCurrent->cds;
int rc = SQLITE_OK;
switch( i ){
case 0: /* name */
sqlite3_result_text(ctx, pCDS->zFile, -1, SQLITE_TRANSIENT);
break;
case 1: /* mode */
/* TODO: Whether or not the following is correct surely depends on
** the platform on which the archive was created. */
sqlite3_result_int(ctx, pCDS->iExternalAttr >> 16);
break;
case 2: { /* mtime */
sqlite3_result_int64(ctx, pCsr->pCurrent->mUnixTime);
break;
}
case 3: { /* sz */
if( sqlite3_vtab_nochange(ctx)==0 ){
sqlite3_result_int64(ctx, pCDS->szUncompressed);
}
break;
}
case 4: /* rawdata */
if( sqlite3_vtab_nochange(ctx) ) break;
case 5: { /* data */
if( i==4 || pCDS->iCompression==0 || pCDS->iCompression==8 ){
int sz = pCDS->szCompressed;
int szFinal = pCDS->szUncompressed;
if( szFinal>0 ){
u8 *aBuf;
u8 *aFree = 0;
if( pCsr->pCurrent->aData ){
aBuf = pCsr->pCurrent->aData;
}else{
aBuf = aFree = sqlite3_malloc64(sz);
if( aBuf==0 ){
rc = SQLITE_NOMEM;
}else{
FILE *pFile = pCsr->pFile;
if( pFile==0 ){
pFile = ((ZipfileTab*)(pCsr->base.pVtab))->pWriteFd;
}
rc = zipfileReadData(pFile, aBuf, sz, pCsr->pCurrent->iDataOff,
&pCsr->base.pVtab->zErrMsg
);
}
}
if( rc==SQLITE_OK ){
if( i==5 && pCDS->iCompression ){
zipfileInflate(ctx, aBuf, sz, szFinal);
}else{
sqlite3_result_blob(ctx, aBuf, sz, SQLITE_TRANSIENT);
}
}
sqlite3_free(aFree);
}else{
/* Figure out if this is a directory or a zero-sized file. Consider
** it to be a directory either if the mode suggests so, or if
** the final character in the name is '/'. */
u32 mode = pCDS->iExternalAttr >> 16;
if( !(mode & S_IFDIR) && pCDS->zFile[pCDS->nFile-1]!='/' ){
sqlite3_result_blob(ctx, "", 0, SQLITE_STATIC);
}
}
}
break;
}
case 6: /* method */
sqlite3_result_int(ctx, pCDS->iCompression);
break;
default: /* z */
assert( i==7 );
sqlite3_result_int64(ctx, pCsr->iId);
break;
}
return rc;
}
/*
** Return TRUE if the cursor is at EOF.
*/
static int zipfileEof(sqlite3_vtab_cursor *cur){
ZipfileCsr *pCsr = (ZipfileCsr*)cur;
return pCsr->bEof;
}
/*
** If aBlob is not NULL, then it points to a buffer nBlob bytes in size
** containing an entire zip archive image. Or, if aBlob is NULL, then pFile
** is guaranteed to be a file-handle open on a zip file.
**
** This function attempts to locate the EOCD record within the zip archive
** and populate *pEOCD with the results of decoding it. SQLITE_OK is
** returned if successful. Otherwise, an SQLite error code is returned and
** an English language error message may be left in virtual-table pTab.
*/
static int zipfileReadEOCD(
ZipfileTab *pTab, /* Return errors here */
const u8 *aBlob, /* Pointer to in-memory file image */
int nBlob, /* Size of aBlob[] in bytes */
FILE *pFile, /* Read from this file if aBlob==0 */
ZipfileEOCD *pEOCD /* Object to populate */
){
u8 *aRead = pTab->aBuffer; /* Temporary buffer */
int nRead; /* Bytes to read from file */
int rc = SQLITE_OK;
if( aBlob==0 ){
i64 iOff; /* Offset to read from */
i64 szFile; /* Total size of file in bytes */
fseek(pFile, 0, SEEK_END);
szFile = (i64)ftell(pFile);
if( szFile==0 ){
memset(pEOCD, 0, sizeof(ZipfileEOCD));
return SQLITE_OK;
}
nRead = (int)(MIN(szFile, ZIPFILE_BUFFER_SIZE));
iOff = szFile - nRead;
rc = zipfileReadData(pFile, aRead, nRead, iOff, &pTab->base.zErrMsg);
}else{
nRead = (int)(MIN(nBlob, ZIPFILE_BUFFER_SIZE));
aRead = (u8*)&aBlob[nBlob-nRead];
}
if( rc==SQLITE_OK ){
int i;
/* Scan backwards looking for the signature bytes */
for(i=nRead-20; i>=0; i--){
if( aRead[i]==0x50 && aRead[i+1]==0x4b
&& aRead[i+2]==0x05 && aRead[i+3]==0x06
){
break;
}
}
if( i<0 ){
pTab->base.zErrMsg = sqlite3_mprintf(
"cannot find end of central directory record"
);
return SQLITE_ERROR;
}
aRead += i+4;
pEOCD->iDisk = zipfileRead16(aRead);
pEOCD->iFirstDisk = zipfileRead16(aRead);
pEOCD->nEntry = zipfileRead16(aRead);
pEOCD->nEntryTotal = zipfileRead16(aRead);
pEOCD->nSize = zipfileRead32(aRead);
pEOCD->iOffset = zipfileRead32(aRead);
}
return rc;
}
/*
** Add object pNew to the linked list that begins at ZipfileTab.pFirstEntry
** and ends with pLastEntry. If argument pBefore is NULL, then pNew is added
** to the end of the list. Otherwise, it is added to the list immediately
** before pBefore (which is guaranteed to be a part of said list).
*/
static void zipfileAddEntry(
ZipfileTab *pTab,
ZipfileEntry *pBefore,
ZipfileEntry *pNew
){
assert( (pTab->pFirstEntry==0)==(pTab->pLastEntry==0) );
assert( pNew->pNext==0 );
if( pBefore==0 ){
if( pTab->pFirstEntry==0 ){
pTab->pFirstEntry = pTab->pLastEntry = pNew;
}else{
assert( pTab->pLastEntry->pNext==0 );
pTab->pLastEntry->pNext = pNew;
pTab->pLastEntry = pNew;
}
}else{
ZipfileEntry **pp;
for(pp=&pTab->pFirstEntry; *pp!=pBefore; pp=&((*pp)->pNext));
pNew->pNext = pBefore;
*pp = pNew;
}
}
static int zipfileLoadDirectory(ZipfileTab *pTab, const u8 *aBlob, int nBlob){
ZipfileEOCD eocd;
int rc;
int i;
i64 iOff;
rc = zipfileReadEOCD(pTab, aBlob, nBlob, pTab->pWriteFd, &eocd);
iOff = eocd.iOffset;
for(i=0; rc==SQLITE_OK && i<eocd.nEntry; i++){
ZipfileEntry *pNew = 0;
rc = zipfileGetEntry(pTab, aBlob, nBlob, pTab->pWriteFd, iOff, &pNew);
if( rc==SQLITE_OK ){
zipfileAddEntry(pTab, 0, pNew);
iOff += ZIPFILE_CDS_FIXED_SZ;
iOff += (int)pNew->cds.nExtra + pNew->cds.nFile + pNew->cds.nComment;
}
}
return rc;
}
/*
** xFilter callback.
*/
static int zipfileFilter(
sqlite3_vtab_cursor *cur,
int idxNum, const char *idxStr,
int argc, sqlite3_value **argv
){
ZipfileTab *pTab = (ZipfileTab*)cur->pVtab;
ZipfileCsr *pCsr = (ZipfileCsr*)cur;
const char *zFile = 0; /* Zip file to scan */
int rc = SQLITE_OK; /* Return Code */
int bInMemory = 0; /* True for an in-memory zipfile */
zipfileResetCursor(pCsr);
if( pTab->zFile ){
zFile = pTab->zFile;
}else if( idxNum==0 ){
zipfileCursorErr(pCsr, "zipfile() function requires an argument");
return SQLITE_ERROR;
}else if( sqlite3_value_type(argv[0])==SQLITE_BLOB ){
const u8 *aBlob = (const u8*)sqlite3_value_blob(argv[0]);
int nBlob = sqlite3_value_bytes(argv[0]);
assert( pTab->pFirstEntry==0 );
rc = zipfileLoadDirectory(pTab, aBlob, nBlob);
pCsr->pFreeEntry = pTab->pFirstEntry;
pTab->pFirstEntry = pTab->pLastEntry = 0;
if( rc!=SQLITE_OK ) return rc;
bInMemory = 1;
}else{
zFile = (const char*)sqlite3_value_text(argv[0]);
}
if( 0==pTab->pWriteFd && 0==bInMemory ){
pCsr->pFile = fopen(zFile, "rb");
if( pCsr->pFile==0 ){
zipfileCursorErr(pCsr, "cannot open file: %s", zFile);
rc = SQLITE_ERROR;
}else{
rc = zipfileReadEOCD(pTab, 0, 0, pCsr->pFile, &pCsr->eocd);
if( rc==SQLITE_OK ){
if( pCsr->eocd.nEntry==0 ){
pCsr->bEof = 1;
}else{
pCsr->iNextOff = pCsr->eocd.iOffset;
rc = zipfileNext(cur);
}
}
}
}else{
pCsr->bNoop = 1;
pCsr->pCurrent = pCsr->pFreeEntry ? pCsr->pFreeEntry : pTab->pFirstEntry;
rc = zipfileNext(cur);
}
return rc;
}
/*
** xBestIndex callback.
*/
static int zipfileBestIndex(
sqlite3_vtab *tab,
sqlite3_index_info *pIdxInfo
){
int i;
int idx = -1;
int unusable = 0;
for(i=0; i<pIdxInfo->nConstraint; i++){
const struct sqlite3_index_constraint *pCons = &pIdxInfo->aConstraint[i];
if( pCons->iColumn!=ZIPFILE_F_COLUMN_IDX ) continue;
if( pCons->usable==0 ){
unusable = 1;
}else if( pCons->op==SQLITE_INDEX_CONSTRAINT_EQ ){
idx = i;
}
}
pIdxInfo->estimatedCost = 1000.0;
if( idx>=0 ){
pIdxInfo->aConstraintUsage[idx].argvIndex = 1;
pIdxInfo->aConstraintUsage[idx].omit = 1;
pIdxInfo->idxNum = 1;
}else if( unusable ){
return SQLITE_CONSTRAINT;
}
return SQLITE_OK;
}
static ZipfileEntry *zipfileNewEntry(const char *zPath){
ZipfileEntry *pNew;
pNew = sqlite3_malloc(sizeof(ZipfileEntry));
if( pNew ){
memset(pNew, 0, sizeof(ZipfileEntry));
pNew->cds.zFile = sqlite3_mprintf("%s", zPath);
if( pNew->cds.zFile==0 ){
sqlite3_free(pNew);
pNew = 0;
}
}
return pNew;
}
static int zipfileSerializeLFH(ZipfileEntry *pEntry, u8 *aBuf){
ZipfileCDS *pCds = &pEntry->cds;
u8 *a = aBuf;
pCds->nExtra = 9;
/* Write the LFH itself */
zipfileWrite32(a, ZIPFILE_SIGNATURE_LFH);
zipfileWrite16(a, pCds->iVersionExtract);
zipfileWrite16(a, pCds->flags);
zipfileWrite16(a, pCds->iCompression);
zipfileWrite16(a, pCds->mTime);
zipfileWrite16(a, pCds->mDate);
zipfileWrite32(a, pCds->crc32);
zipfileWrite32(a, pCds->szCompressed);
zipfileWrite32(a, pCds->szUncompressed);
zipfileWrite16(a, (u16)pCds->nFile);
zipfileWrite16(a, pCds->nExtra);
assert( a==&aBuf[ZIPFILE_LFH_FIXED_SZ] );
/* Add the file name */
memcpy(a, pCds->zFile, (int)pCds->nFile);
a += (int)pCds->nFile;
/* The "extra" data */
zipfileWrite16(a, ZIPFILE_EXTRA_TIMESTAMP);
zipfileWrite16(a, 5);
*a++ = 0x01;
zipfileWrite32(a, pEntry->mUnixTime);
return a-aBuf;
}
static int zipfileAppendEntry(
ZipfileTab *pTab,
ZipfileEntry *pEntry,
const u8 *pData,
int nData
){
u8 *aBuf = pTab->aBuffer;
int nBuf;
int rc;
nBuf = zipfileSerializeLFH(pEntry, aBuf);
rc = zipfileAppendData(pTab, aBuf, nBuf);
if( rc==SQLITE_OK ){
pEntry->iDataOff = pTab->szCurrent;
rc = zipfileAppendData(pTab, pData, nData);
}
return rc;
}
static int zipfileGetMode(
sqlite3_value *pVal,
int bIsDir, /* If true, default to directory */
u32 *pMode, /* OUT: Mode value */
char **pzErr /* OUT: Error message */
){
const char *z = (const char*)sqlite3_value_text(pVal);
u32 mode = 0;
if( z==0 ){
mode = (bIsDir ? (S_IFDIR + 0755) : (S_IFREG + 0644));
}else if( z[0]>='0' && z[0]<='9' ){
mode = (unsigned int)sqlite3_value_int(pVal);
}else{
const char zTemplate[11] = "-rwxrwxrwx";
int i;
if( strlen(z)!=10 ) goto parse_error;
switch( z[0] ){
case '-': mode |= S_IFREG; break;
case 'd': mode |= S_IFDIR; break;
case 'l': mode |= S_IFLNK; break;
default: goto parse_error;
}
for(i=1; i<10; i++){
if( z[i]==zTemplate[i] ) mode |= 1 << (9-i);
else if( z[i]!='-' ) goto parse_error;
}
}
if( ((mode & S_IFDIR)==0)==bIsDir ){
/* The "mode" attribute is a directory, but data has been specified.
** Or vice-versa - no data but "mode" is a file or symlink. */
*pzErr = sqlite3_mprintf("zipfile: mode does not match data");
return SQLITE_CONSTRAINT;
}
*pMode = mode;
return SQLITE_OK;
parse_error:
*pzErr = sqlite3_mprintf("zipfile: parse error in mode: %s", z);
return SQLITE_ERROR;
}
/*
** Both (const char*) arguments point to nul-terminated strings. Argument
** nB is the value of strlen(zB). This function returns 0 if the strings are
** identical, ignoring any trailing '/' character in either path. */
static int zipfileComparePath(const char *zA, const char *zB, int nB){
int nA = (int)strlen(zA);
if( nA>0 && zA[nA-1]=='/' ) nA--;
if( nB>0 && zB[nB-1]=='/' ) nB--;
if( nA==nB && memcmp(zA, zB, nA)==0 ) return 0;
return 1;
}
static int zipfileBegin(sqlite3_vtab *pVtab){
ZipfileTab *pTab = (ZipfileTab*)pVtab;
int rc = SQLITE_OK;
assert( pTab->pWriteFd==0 );
if( pTab->zFile==0 || pTab->zFile[0]==0 ){
pTab->base.zErrMsg = sqlite3_mprintf("zipfile: missing filename");
return SQLITE_ERROR;
}
/* Open a write fd on the file. Also load the entire central directory
** structure into memory. During the transaction any new file data is
** appended to the archive file, but the central directory is accumulated
** in main-memory until the transaction is committed. */
pTab->pWriteFd = fopen(pTab->zFile, "ab+");
if( pTab->pWriteFd==0 ){
pTab->base.zErrMsg = sqlite3_mprintf(
"zipfile: failed to open file %s for writing", pTab->zFile
);
rc = SQLITE_ERROR;
}else{
fseek(pTab->pWriteFd, 0, SEEK_END);
pTab->szCurrent = pTab->szOrig = (i64)ftell(pTab->pWriteFd);
rc = zipfileLoadDirectory(pTab, 0, 0);
}
if( rc!=SQLITE_OK ){
zipfileCleanupTransaction(pTab);
}
return rc;
}
/*
** Return the current time as a 32-bit timestamp in UNIX epoch format (like
** time(2)).
*/
static u32 zipfileTime(void){
sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
u32 ret;
if( pVfs->iVersion>=2 && pVfs->xCurrentTimeInt64 ){
i64 ms;
pVfs->xCurrentTimeInt64(pVfs, &ms);
ret = (u32)((ms/1000) - ((i64)24405875 * 8640));
}else{
double day;
pVfs->xCurrentTime(pVfs, &day);
ret = (u32)((day - 2440587.5) * 86400);
}
return ret;
}
/*
** Return a 32-bit timestamp in UNIX epoch format.
**
** If the value passed as the only argument is either NULL or an SQL NULL,
** return the current time. Otherwise, return the value stored in (*pVal)
** cast to a 32-bit unsigned integer.
*/
static u32 zipfileGetTime(sqlite3_value *pVal){
if( pVal==0 || sqlite3_value_type(pVal)==SQLITE_NULL ){
return zipfileTime();
}
return (u32)sqlite3_value_int64(pVal);
}
/*
** Unless it is NULL, entry pOld is currently part of the pTab->pFirstEntry
** linked list. Remove it from the list and free the object.
*/
static void zipfileRemoveEntryFromList(ZipfileTab *pTab, ZipfileEntry *pOld){
if( pOld ){
ZipfileEntry **pp;
for(pp=&pTab->pFirstEntry; (*pp)!=pOld; pp=&((*pp)->pNext));
*pp = (*pp)->pNext;
zipfileEntryFree(pOld);
}
}
/*
** xUpdate method.
*/
static int zipfileUpdate(
sqlite3_vtab *pVtab,
int nVal,
sqlite3_value **apVal,
sqlite_int64 *pRowid
){
ZipfileTab *pTab = (ZipfileTab*)pVtab;
int rc = SQLITE_OK; /* Return Code */
ZipfileEntry *pNew = 0; /* New in-memory CDS entry */
u32 mode = 0; /* Mode for new entry */
u32 mTime = 0; /* Modification time for new entry */
i64 sz = 0; /* Uncompressed size */
const char *zPath = 0; /* Path for new entry */
int nPath = 0; /* strlen(zPath) */
const u8 *pData = 0; /* Pointer to buffer containing content */
int nData = 0; /* Size of pData buffer in bytes */
int iMethod = 0; /* Compression method for new entry */
u8 *pFree = 0; /* Free this */
char *zFree = 0; /* Also free this */
ZipfileEntry *pOld = 0;
ZipfileEntry *pOld2 = 0;
int bUpdate = 0; /* True for an update that modifies "name" */
int bIsDir = 0;
u32 iCrc32 = 0;
if( pTab->pWriteFd==0 ){
rc = zipfileBegin(pVtab);
if( rc!=SQLITE_OK ) return rc;
}
/* If this is a DELETE or UPDATE, find the archive entry to delete. */
if( sqlite3_value_type(apVal[0])!=SQLITE_NULL ){
const char *zDelete = (const char*)sqlite3_value_text(apVal[0]);
int nDelete = (int)strlen(zDelete);
if( nVal>1 ){
const char *zUpdate = (const char*)sqlite3_value_text(apVal[1]);
if( zUpdate && zipfileComparePath(zUpdate, zDelete, nDelete)!=0 ){
bUpdate = 1;
}
}
for(pOld=pTab->pFirstEntry; 1; pOld=pOld->pNext){
if( zipfileComparePath(pOld->cds.zFile, zDelete, nDelete)==0 ){
break;
}
assert( pOld->pNext );
}
}
if( nVal>1 ){
/* Check that "sz" and "rawdata" are both NULL: */
if( sqlite3_value_type(apVal[5])!=SQLITE_NULL ){
zipfileTableErr(pTab, "sz must be NULL");
rc = SQLITE_CONSTRAINT;
}
if( sqlite3_value_type(apVal[6])!=SQLITE_NULL ){
zipfileTableErr(pTab, "rawdata must be NULL");
rc = SQLITE_CONSTRAINT;
}
if( rc==SQLITE_OK ){
if( sqlite3_value_type(apVal[7])==SQLITE_NULL ){
/* data=NULL. A directory */
bIsDir = 1;
}else{
/* Value specified for "data", and possibly "method". This must be
** a regular file or a symlink. */
const u8 *aIn = sqlite3_value_blob(apVal[7]);
int nIn = sqlite3_value_bytes(apVal[7]);
int bAuto = sqlite3_value_type(apVal[8])==SQLITE_NULL;
iMethod = sqlite3_value_int(apVal[8]);
sz = nIn;
pData = aIn;
nData = nIn;
if( iMethod!=0 && iMethod!=8 ){
zipfileTableErr(pTab, "unknown compression method: %d", iMethod);
rc = SQLITE_CONSTRAINT;
}else{
if( bAuto || iMethod ){
int nCmp;
rc = zipfileDeflate(aIn, nIn, &pFree, &nCmp, &pTab->base.zErrMsg);
if( rc==SQLITE_OK ){
if( iMethod || nCmp<nIn ){
iMethod = 8;
pData = pFree;
nData = nCmp;
}
}
}
iCrc32 = crc32(0, aIn, nIn);
}
}
}
if( rc==SQLITE_OK ){
rc = zipfileGetMode(apVal[3], bIsDir, &mode, &pTab->base.zErrMsg);
}
if( rc==SQLITE_OK ){
zPath = (const char*)sqlite3_value_text(apVal[2]);
if( zPath==0 ) zPath = "";
nPath = (int)strlen(zPath);
mTime = zipfileGetTime(apVal[4]);
}
if( rc==SQLITE_OK && bIsDir ){
/* For a directory, check that the last character in the path is a
** '/'. This appears to be required for compatibility with info-zip
** (the unzip command on unix). It does not create directories
** otherwise. */
if( nPath<=0 || zPath[nPath-1]!='/' ){
zFree = sqlite3_mprintf("%s/", zPath);
zPath = (const char*)zFree;
if( zFree==0 ){
rc = SQLITE_NOMEM;
nPath = 0;
}else{
nPath = (int)strlen(zPath);
}
}
}
/* Check that we're not inserting a duplicate entry -OR- updating an
** entry with a path, thereby making it into a duplicate. */
if( (pOld==0 || bUpdate) && rc==SQLITE_OK ){
ZipfileEntry *p;
for(p=pTab->pFirstEntry; p; p=p->pNext){
if( zipfileComparePath(p->cds.zFile, zPath, nPath)==0 ){
switch( sqlite3_vtab_on_conflict(pTab->db) ){
case SQLITE_IGNORE: {
goto zipfile_update_done;
}
case SQLITE_REPLACE: {
pOld2 = p;
break;
}
default: {
zipfileTableErr(pTab, "duplicate name: \"%s\"", zPath);
rc = SQLITE_CONSTRAINT;
break;
}
}
break;
}
}
}
if( rc==SQLITE_OK ){
/* Create the new CDS record. */
pNew = zipfileNewEntry(zPath);
if( pNew==0 ){
rc = SQLITE_NOMEM;
}else{
pNew->cds.iVersionMadeBy = ZIPFILE_NEWENTRY_MADEBY;
pNew->cds.iVersionExtract = ZIPFILE_NEWENTRY_REQUIRED;
pNew->cds.flags = ZIPFILE_NEWENTRY_FLAGS;
pNew->cds.iCompression = (u16)iMethod;
zipfileMtimeToDos(&pNew->cds, mTime);
pNew->cds.crc32 = iCrc32;
pNew->cds.szCompressed = nData;
pNew->cds.szUncompressed = (u32)sz;
pNew->cds.iExternalAttr = (mode<<16);
pNew->cds.iOffset = (u32)pTab->szCurrent;
pNew->cds.nFile = (u16)nPath;
pNew->mUnixTime = (u32)mTime;
rc = zipfileAppendEntry(pTab, pNew, pData, nData);
zipfileAddEntry(pTab, pOld, pNew);
}
}
}
if( rc==SQLITE_OK && (pOld || pOld2) ){
ZipfileCsr *pCsr;
for(pCsr=pTab->pCsrList; pCsr; pCsr=pCsr->pCsrNext){
if( pCsr->pCurrent && (pCsr->pCurrent==pOld || pCsr->pCurrent==pOld2) ){
pCsr->pCurrent = pCsr->pCurrent->pNext;
pCsr->bNoop = 1;
}
}
zipfileRemoveEntryFromList(pTab, pOld);
zipfileRemoveEntryFromList(pTab, pOld2);
}
zipfile_update_done:
sqlite3_free(pFree);
sqlite3_free(zFree);
return rc;
}
static int zipfileSerializeEOCD(ZipfileEOCD *p, u8 *aBuf){
u8 *a = aBuf;
zipfileWrite32(a, ZIPFILE_SIGNATURE_EOCD);
zipfileWrite16(a, p->iDisk);
zipfileWrite16(a, p->iFirstDisk);
zipfileWrite16(a, p->nEntry);
zipfileWrite16(a, p->nEntryTotal);
zipfileWrite32(a, p->nSize);
zipfileWrite32(a, p->iOffset);
zipfileWrite16(a, 0); /* Size of trailing comment in bytes*/
return a-aBuf;
}
static int zipfileAppendEOCD(ZipfileTab *pTab, ZipfileEOCD *p){
int nBuf = zipfileSerializeEOCD(p, pTab->aBuffer);
assert( nBuf==ZIPFILE_EOCD_FIXED_SZ );
return zipfileAppendData(pTab, pTab->aBuffer, nBuf);
}
/*
** Serialize the CDS structure into buffer aBuf[]. Return the number
** of bytes written.
*/
static int zipfileSerializeCDS(ZipfileEntry *pEntry, u8 *aBuf){
u8 *a = aBuf;
ZipfileCDS *pCDS = &pEntry->cds;
if( pEntry->aExtra==0 ){
pCDS->nExtra = 9;
}
zipfileWrite32(a, ZIPFILE_SIGNATURE_CDS);
zipfileWrite16(a, pCDS->iVersionMadeBy);
zipfileWrite16(a, pCDS->iVersionExtract);
zipfileWrite16(a, pCDS->flags);
zipfileWrite16(a, pCDS->iCompression);
zipfileWrite16(a, pCDS->mTime);
zipfileWrite16(a, pCDS->mDate);
zipfileWrite32(a, pCDS->crc32);
zipfileWrite32(a, pCDS->szCompressed);
zipfileWrite32(a, pCDS->szUncompressed);
assert( a==&aBuf[ZIPFILE_CDS_NFILE_OFF] );
zipfileWrite16(a, pCDS->nFile);
zipfileWrite16(a, pCDS->nExtra);
zipfileWrite16(a, pCDS->nComment);
zipfileWrite16(a, pCDS->iDiskStart);
zipfileWrite16(a, pCDS->iInternalAttr);
zipfileWrite32(a, pCDS->iExternalAttr);
zipfileWrite32(a, pCDS->iOffset);
memcpy(a, pCDS->zFile, pCDS->nFile);
a += pCDS->nFile;
if( pEntry->aExtra ){
int n = (int)pCDS->nExtra + (int)pCDS->nComment;
memcpy(a, pEntry->aExtra, n);
a += n;
}else{
assert( pCDS->nExtra==9 );
zipfileWrite16(a, ZIPFILE_EXTRA_TIMESTAMP);
zipfileWrite16(a, 5);
*a++ = 0x01;
zipfileWrite32(a, pEntry->mUnixTime);
}
return a-aBuf;
}
static int zipfileCommit(sqlite3_vtab *pVtab){
ZipfileTab *pTab = (ZipfileTab*)pVtab;
int rc = SQLITE_OK;
if( pTab->pWriteFd ){
i64 iOffset = pTab->szCurrent;
ZipfileEntry *p;
ZipfileEOCD eocd;
int nEntry = 0;
/* Write out all entries */
for(p=pTab->pFirstEntry; rc==SQLITE_OK && p; p=p->pNext){
int n = zipfileSerializeCDS(p, pTab->aBuffer);
rc = zipfileAppendData(pTab, pTab->aBuffer, n);
nEntry++;
}
/* Write out the EOCD record */
eocd.iDisk = 0;
eocd.iFirstDisk = 0;
eocd.nEntry = (u16)nEntry;
eocd.nEntryTotal = (u16)nEntry;
eocd.nSize = (u32)(pTab->szCurrent - iOffset);
eocd.iOffset = (u32)iOffset;
rc = zipfileAppendEOCD(pTab, &eocd);
zipfileCleanupTransaction(pTab);
}
return rc;
}
static int zipfileRollback(sqlite3_vtab *pVtab){
return zipfileCommit(pVtab);
}
static ZipfileCsr *zipfileFindCursor(ZipfileTab *pTab, i64 iId){
ZipfileCsr *pCsr;
for(pCsr=pTab->pCsrList; pCsr; pCsr=pCsr->pCsrNext){
if( iId==pCsr->iId ) break;
}
return pCsr;
}
static void zipfileFunctionCds(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
ZipfileCsr *pCsr;
ZipfileTab *pTab = (ZipfileTab*)sqlite3_user_data(context);
assert( argc>0 );
pCsr = zipfileFindCursor(pTab, sqlite3_value_int64(argv[0]));
if( pCsr ){
ZipfileCDS *p = &pCsr->pCurrent->cds;
char *zRes = sqlite3_mprintf("{"
"\"version-made-by\" : %u, "
"\"version-to-extract\" : %u, "
"\"flags\" : %u, "
"\"compression\" : %u, "
"\"time\" : %u, "
"\"date\" : %u, "
"\"crc32\" : %u, "
"\"compressed-size\" : %u, "
"\"uncompressed-size\" : %u, "
"\"file-name-length\" : %u, "
"\"extra-field-length\" : %u, "
"\"file-comment-length\" : %u, "
"\"disk-number-start\" : %u, "
"\"internal-attr\" : %u, "
"\"external-attr\" : %u, "
"\"offset\" : %u }",
(u32)p->iVersionMadeBy, (u32)p->iVersionExtract,
(u32)p->flags, (u32)p->iCompression,
(u32)p->mTime, (u32)p->mDate,
(u32)p->crc32, (u32)p->szCompressed,
(u32)p->szUncompressed, (u32)p->nFile,
(u32)p->nExtra, (u32)p->nComment,
(u32)p->iDiskStart, (u32)p->iInternalAttr,
(u32)p->iExternalAttr, (u32)p->iOffset
);
if( zRes==0 ){
sqlite3_result_error_nomem(context);
}else{
sqlite3_result_text(context, zRes, -1, SQLITE_TRANSIENT);
sqlite3_free(zRes);
}
}
}
/*
** xFindFunction method.
*/
static int zipfileFindFunction(
sqlite3_vtab *pVtab, /* Virtual table handle */
int nArg, /* Number of SQL function arguments */
const char *zName, /* Name of SQL function */
void (**pxFunc)(sqlite3_context*,int,sqlite3_value**), /* OUT: Result */
void **ppArg /* OUT: User data for *pxFunc */
){
if( sqlite3_stricmp("zipfile_cds", zName)==0 ){
*pxFunc = zipfileFunctionCds;
*ppArg = (void*)pVtab;
return 1;
}
return 0;
}
typedef struct ZipfileBuffer ZipfileBuffer;
struct ZipfileBuffer {
u8 *a; /* Pointer to buffer */
int n; /* Size of buffer in bytes */
int nAlloc; /* Byte allocated at a[] */
};
typedef struct ZipfileCtx ZipfileCtx;
struct ZipfileCtx {
int nEntry;
ZipfileBuffer body;
ZipfileBuffer cds;
};
static int zipfileBufferGrow(ZipfileBuffer *pBuf, int nByte){
if( pBuf->n+nByte>pBuf->nAlloc ){
u8 *aNew;
sqlite3_int64 nNew = pBuf->n ? pBuf->n*2 : 512;
int nReq = pBuf->n + nByte;
while( nNew<nReq ) nNew = nNew*2;
aNew = sqlite3_realloc64(pBuf->a, nNew);
if( aNew==0 ) return SQLITE_NOMEM;
pBuf->a = aNew;
pBuf->nAlloc = (int)nNew;
}
return SQLITE_OK;
}
/*
** xStep() callback for the zipfile() aggregate. This can be called in
** any of the following ways:
**
** SELECT zipfile(name,data) ...
** SELECT zipfile(name,mode,mtime,data) ...
** SELECT zipfile(name,mode,mtime,data,method) ...
*/
void zipfileStep(sqlite3_context *pCtx, int nVal, sqlite3_value **apVal){
ZipfileCtx *p; /* Aggregate function context */
ZipfileEntry e; /* New entry to add to zip archive */
sqlite3_value *pName = 0;
sqlite3_value *pMode = 0;
sqlite3_value *pMtime = 0;
sqlite3_value *pData = 0;
sqlite3_value *pMethod = 0;
int bIsDir = 0;
u32 mode;
int rc = SQLITE_OK;
char *zErr = 0;
int iMethod = -1; /* Compression method to use (0 or 8) */
const u8 *aData = 0; /* Possibly compressed data for new entry */
int nData = 0; /* Size of aData[] in bytes */
int szUncompressed = 0; /* Size of data before compression */
u8 *aFree = 0; /* Free this before returning */
u32 iCrc32 = 0; /* crc32 of uncompressed data */
char *zName = 0; /* Path (name) of new entry */
int nName = 0; /* Size of zName in bytes */
char *zFree = 0; /* Free this before returning */
int nByte;
memset(&e, 0, sizeof(e));
p = (ZipfileCtx*)sqlite3_aggregate_context(pCtx, sizeof(ZipfileCtx));
if( p==0 ) return;
/* Martial the arguments into stack variables */
if( nVal!=2 && nVal!=4 && nVal!=5 ){
zErr = sqlite3_mprintf("wrong number of arguments to function zipfile()");
rc = SQLITE_ERROR;
goto zipfile_step_out;
}
pName = apVal[0];
if( nVal==2 ){
pData = apVal[1];
}else{
pMode = apVal[1];
pMtime = apVal[2];
pData = apVal[3];
if( nVal==5 ){
pMethod = apVal[4];
}
}
/* Check that the 'name' parameter looks ok. */
zName = (char*)sqlite3_value_text(pName);
nName = sqlite3_value_bytes(pName);
if( zName==0 ){
zErr = sqlite3_mprintf("first argument to zipfile() must be non-NULL");
rc = SQLITE_ERROR;
goto zipfile_step_out;
}
/* Inspect the 'method' parameter. This must be either 0 (store), 8 (use
** deflate compression) or NULL (choose automatically). */
if( pMethod && SQLITE_NULL!=sqlite3_value_type(pMethod) ){
iMethod = (int)sqlite3_value_int64(pMethod);
if( iMethod!=0 && iMethod!=8 ){
zErr = sqlite3_mprintf("illegal method value: %d", iMethod);
rc = SQLITE_ERROR;
goto zipfile_step_out;
}
}
/* Now inspect the data. If this is NULL, then the new entry must be a
** directory. Otherwise, figure out whether or not the data should
** be deflated or simply stored in the zip archive. */
if( sqlite3_value_type(pData)==SQLITE_NULL ){
bIsDir = 1;
iMethod = 0;
}else{
aData = sqlite3_value_blob(pData);
szUncompressed = nData = sqlite3_value_bytes(pData);
iCrc32 = crc32(0, aData, nData);
if( iMethod<0 || iMethod==8 ){
int nOut = 0;
rc = zipfileDeflate(aData, nData, &aFree, &nOut, &zErr);
if( rc!=SQLITE_OK ){
goto zipfile_step_out;
}
if( iMethod==8 || nOut<nData ){
aData = aFree;
nData = nOut;
iMethod = 8;
}else{
iMethod = 0;
}
}
}
/* Decode the "mode" argument. */
rc = zipfileGetMode(pMode, bIsDir, &mode, &zErr);
if( rc ) goto zipfile_step_out;
/* Decode the "mtime" argument. */
e.mUnixTime = zipfileGetTime(pMtime);
/* If this is a directory entry, ensure that there is exactly one '/'
** at the end of the path. Or, if this is not a directory and the path
** ends in '/' it is an error. */
if( bIsDir==0 ){
if( nName>0 && zName[nName-1]=='/' ){
zErr = sqlite3_mprintf("non-directory name must not end with /");
rc = SQLITE_ERROR;
goto zipfile_step_out;
}
}else{
if( nName==0 || zName[nName-1]!='/' ){
zName = zFree = sqlite3_mprintf("%s/", zName);
if( zName==0 ){
rc = SQLITE_NOMEM;
goto zipfile_step_out;
}
nName = (int)strlen(zName);
}else{
while( nName>1 && zName[nName-2]=='/' ) nName--;
}
}
/* Assemble the ZipfileEntry object for the new zip archive entry */
e.cds.iVersionMadeBy = ZIPFILE_NEWENTRY_MADEBY;
e.cds.iVersionExtract = ZIPFILE_NEWENTRY_REQUIRED;
e.cds.flags = ZIPFILE_NEWENTRY_FLAGS;
e.cds.iCompression = (u16)iMethod;
zipfileMtimeToDos(&e.cds, (u32)e.mUnixTime);
e.cds.crc32 = iCrc32;
e.cds.szCompressed = nData;
e.cds.szUncompressed = szUncompressed;
e.cds.iExternalAttr = (mode<<16);
e.cds.iOffset = p->body.n;
e.cds.nFile = (u16)nName;
e.cds.zFile = zName;
/* Append the LFH to the body of the new archive */
nByte = ZIPFILE_LFH_FIXED_SZ + e.cds.nFile + 9;
if( (rc = zipfileBufferGrow(&p->body, nByte)) ) goto zipfile_step_out;
p->body.n += zipfileSerializeLFH(&e, &p->body.a[p->body.n]);
/* Append the data to the body of the new archive */
if( nData>0 ){
if( (rc = zipfileBufferGrow(&p->body, nData)) ) goto zipfile_step_out;
memcpy(&p->body.a[p->body.n], aData, nData);
p->body.n += nData;
}
/* Append the CDS record to the directory of the new archive */
nByte = ZIPFILE_CDS_FIXED_SZ + e.cds.nFile + 9;
if( (rc = zipfileBufferGrow(&p->cds, nByte)) ) goto zipfile_step_out;
p->cds.n += zipfileSerializeCDS(&e, &p->cds.a[p->cds.n]);
/* Increment the count of entries in the archive */
p->nEntry++;
zipfile_step_out:
sqlite3_free(aFree);
sqlite3_free(zFree);
if( rc ){
if( zErr ){
sqlite3_result_error(pCtx, zErr, -1);
}else{
sqlite3_result_error_code(pCtx, rc);
}
}
sqlite3_free(zErr);
}
/*
** xFinalize() callback for zipfile aggregate function.
*/
void zipfileFinal(sqlite3_context *pCtx){
ZipfileCtx *p;
ZipfileEOCD eocd;
sqlite3_int64 nZip;
u8 *aZip;
p = (ZipfileCtx*)sqlite3_aggregate_context(pCtx, sizeof(ZipfileCtx));
if( p==0 ) return;
if( p->nEntry>0 ){
memset(&eocd, 0, sizeof(eocd));
eocd.nEntry = (u16)p->nEntry;
eocd.nEntryTotal = (u16)p->nEntry;
eocd.nSize = p->cds.n;
eocd.iOffset = p->body.n;
nZip = p->body.n + p->cds.n + ZIPFILE_EOCD_FIXED_SZ;
aZip = (u8*)sqlite3_malloc64(nZip);
if( aZip==0 ){
sqlite3_result_error_nomem(pCtx);
}else{
memcpy(aZip, p->body.a, p->body.n);
memcpy(&aZip[p->body.n], p->cds.a, p->cds.n);
zipfileSerializeEOCD(&eocd, &aZip[p->body.n + p->cds.n]);
sqlite3_result_blob(pCtx, aZip, (int)nZip, zipfileFree);
}
}
sqlite3_free(p->body.a);
sqlite3_free(p->cds.a);
}
/*
** Register the "zipfile" virtual table.
*/
static int zipfileRegister(sqlite3 *db){
static sqlite3_module zipfileModule = {
1, /* iVersion */
zipfileConnect, /* xCreate */
zipfileConnect, /* xConnect */
zipfileBestIndex, /* xBestIndex */
zipfileDisconnect, /* xDisconnect */
zipfileDisconnect, /* xDestroy */
zipfileOpen, /* xOpen - open a cursor */
zipfileClose, /* xClose - close a cursor */
zipfileFilter, /* xFilter - configure scan constraints */
zipfileNext, /* xNext - advance a cursor */
zipfileEof, /* xEof - check for end of scan */
zipfileColumn, /* xColumn - read data */
0, /* xRowid - read data */
zipfileUpdate, /* xUpdate */
zipfileBegin, /* xBegin */
0, /* xSync */
zipfileCommit, /* xCommit */
zipfileRollback, /* xRollback */
zipfileFindFunction, /* xFindMethod */
0, /* xRename */
};
int rc = sqlite3_create_module(db, "zipfile" , &zipfileModule, 0);
if( rc==SQLITE_OK ) rc = sqlite3_overload_function(db, "zipfile_cds", -1);
if( rc==SQLITE_OK ){
rc = sqlite3_create_function(db, "zipfile", -1, SQLITE_UTF8, 0, 0,
zipfileStep, zipfileFinal
);
}
return rc;
}
#else /* SQLITE_OMIT_VIRTUALTABLE */
# define zipfileRegister(x) SQLITE_OK
#endif
int sqlite3_zipfile_init(
sqlite3 *db,
char **pzErrMsg,
const sqlite3_api_routines *pApi
){
SQLITE_EXTENSION_INIT2(pApi);
(void)pzErrMsg; /* Unused parameter */
return zipfileRegister(db);
}
| 64,303 | 2,174 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/vdbeapi.c | /*
** 2004 May 26
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains code use to implement APIs that are part of the
** VDBE.
*/
#include "third_party/sqlite3/sqliteInt.h"
#include "third_party/sqlite3/vdbeInt.inc"
#ifndef SQLITE_OMIT_DEPRECATED
/*
** Return TRUE (non-zero) of the statement supplied as an argument needs
** to be recompiled. A statement needs to be recompiled whenever the
** execution environment changes in a way that would alter the program
** that sqlite3_prepare() generates. For example, if new functions or
** collating sequences are registered or if an authorizer function is
** added or changed.
*/
int sqlite3_expired(sqlite3_stmt *pStmt){
Vdbe *p = (Vdbe*)pStmt;
return p==0 || p->expired;
}
#endif
/*
** Check on a Vdbe to make sure it has not been finalized. Log
** an error and return true if it has been finalized (or is otherwise
** invalid). Return false if it is ok.
*/
static int vdbeSafety(Vdbe *p){
if( p->db==0 ){
sqlite3_log(SQLITE_MISUSE, "API called with finalized prepared statement");
return 1;
}else{
return 0;
}
}
static int vdbeSafetyNotNull(Vdbe *p){
if( p==0 ){
sqlite3_log(SQLITE_MISUSE, "API called with NULL prepared statement");
return 1;
}else{
return vdbeSafety(p);
}
}
#ifndef SQLITE_OMIT_TRACE
/*
** Invoke the profile callback. This routine is only called if we already
** know that the profile callback is defined and needs to be invoked.
*/
static SQLITE_NOINLINE void invokeProfileCallback(sqlite3 *db, Vdbe *p){
sqlite3_int64 iNow;
sqlite3_int64 iElapse;
assert( p->startTime>0 );
assert( (db->mTrace & (SQLITE_TRACE_PROFILE|SQLITE_TRACE_XPROFILE))!=0 );
assert( db->init.busy==0 );
assert( p->zSql!=0 );
sqlite3OsCurrentTimeInt64(db->pVfs, &iNow);
iElapse = (iNow - p->startTime)*1000000;
#ifndef SQLITE_OMIT_DEPRECATED
if( db->xProfile ){
db->xProfile(db->pProfileArg, p->zSql, iElapse);
}
#endif
if( db->mTrace & SQLITE_TRACE_PROFILE ){
db->trace.xV2(SQLITE_TRACE_PROFILE, db->pTraceArg, p, (void*)&iElapse);
}
p->startTime = 0;
}
/*
** The checkProfileCallback(DB,P) macro checks to see if a profile callback
** is needed, and it invokes the callback if it is needed.
*/
# define checkProfileCallback(DB,P) \
if( ((P)->startTime)>0 ){ invokeProfileCallback(DB,P); }
#else
# define checkProfileCallback(DB,P) /*no-op*/
#endif
/*
** The following routine destroys a virtual machine that is created by
** the sqlite3_compile() routine. The integer returned is an SQLITE_
** success/failure code that describes the result of executing the virtual
** machine.
**
** This routine sets the error code and string returned by
** sqlite3_errcode(), sqlite3_errmsg() and sqlite3_errmsg16().
*/
int sqlite3_finalize(sqlite3_stmt *pStmt){
int rc;
if( pStmt==0 ){
/* IMPLEMENTATION-OF: R-57228-12904 Invoking sqlite3_finalize() on a NULL
** pointer is a harmless no-op. */
rc = SQLITE_OK;
}else{
Vdbe *v = (Vdbe*)pStmt;
sqlite3 *db = v->db;
if( vdbeSafety(v) ) return SQLITE_MISUSE_BKPT;
sqlite3_mutex_enter(db->mutex);
checkProfileCallback(db, v);
assert( v->eVdbeState>=VDBE_READY_STATE );
rc = sqlite3VdbeReset(v);
sqlite3VdbeDelete(v);
rc = sqlite3ApiExit(db, rc);
sqlite3LeaveMutexAndCloseZombie(db);
}
return rc;
}
/*
** Terminate the current execution of an SQL statement and reset it
** back to its starting state so that it can be reused. A success code from
** the prior execution is returned.
**
** This routine sets the error code and string returned by
** sqlite3_errcode(), sqlite3_errmsg() and sqlite3_errmsg16().
*/
int sqlite3_reset(sqlite3_stmt *pStmt){
int rc;
if( pStmt==0 ){
rc = SQLITE_OK;
}else{
Vdbe *v = (Vdbe*)pStmt;
sqlite3 *db = v->db;
sqlite3_mutex_enter(db->mutex);
checkProfileCallback(db, v);
rc = sqlite3VdbeReset(v);
sqlite3VdbeRewind(v);
assert( (rc & (db->errMask))==rc );
rc = sqlite3ApiExit(db, rc);
sqlite3_mutex_leave(db->mutex);
}
return rc;
}
/*
** Set all the parameters in the compiled SQL statement to NULL.
*/
int sqlite3_clear_bindings(sqlite3_stmt *pStmt){
int i;
int rc = SQLITE_OK;
Vdbe *p = (Vdbe*)pStmt;
#if SQLITE_THREADSAFE
sqlite3_mutex *mutex = ((Vdbe*)pStmt)->db->mutex;
#endif
sqlite3_mutex_enter(mutex);
for(i=0; i<p->nVar; i++){
sqlite3VdbeMemRelease(&p->aVar[i]);
p->aVar[i].flags = MEM_Null;
}
assert( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || p->expmask==0 );
if( p->expmask ){
p->expired = 1;
}
sqlite3_mutex_leave(mutex);
return rc;
}
/**************************** sqlite3_value_ *******************************
** The following routines extract information from a Mem or sqlite3_value
** structure.
*/
const void *sqlite3_value_blob(sqlite3_value *pVal){
Mem *p = (Mem*)pVal;
if( p->flags & (MEM_Blob|MEM_Str) ){
if( ExpandBlob(p)!=SQLITE_OK ){
assert( p->flags==MEM_Null && p->z==0 );
return 0;
}
p->flags |= MEM_Blob;
return p->n ? p->z : 0;
}else{
return sqlite3_value_text(pVal);
}
}
int sqlite3_value_bytes(sqlite3_value *pVal){
return sqlite3ValueBytes(pVal, SQLITE_UTF8);
}
int sqlite3_value_bytes16(sqlite3_value *pVal){
return sqlite3ValueBytes(pVal, SQLITE_UTF16NATIVE);
}
double sqlite3_value_double(sqlite3_value *pVal){
return sqlite3VdbeRealValue((Mem*)pVal);
}
int sqlite3_value_int(sqlite3_value *pVal){
return (int)sqlite3VdbeIntValue((Mem*)pVal);
}
sqlite_int64 sqlite3_value_int64(sqlite3_value *pVal){
return sqlite3VdbeIntValue((Mem*)pVal);
}
unsigned int sqlite3_value_subtype(sqlite3_value *pVal){
Mem *pMem = (Mem*)pVal;
return ((pMem->flags & MEM_Subtype) ? pMem->eSubtype : 0);
}
void *sqlite3_value_pointer(sqlite3_value *pVal, const char *zPType){
Mem *p = (Mem*)pVal;
if( (p->flags&(MEM_TypeMask|MEM_Term|MEM_Subtype)) ==
(MEM_Null|MEM_Term|MEM_Subtype)
&& zPType!=0
&& p->eSubtype=='p'
&& strcmp(p->u.zPType, zPType)==0
){
return (void*)p->z;
}else{
return 0;
}
}
const unsigned char *sqlite3_value_text(sqlite3_value *pVal){
return (const unsigned char *)sqlite3ValueText(pVal, SQLITE_UTF8);
}
#ifndef SQLITE_OMIT_UTF16
const void *sqlite3_value_text16(sqlite3_value* pVal){
return sqlite3ValueText(pVal, SQLITE_UTF16NATIVE);
}
const void *sqlite3_value_text16be(sqlite3_value *pVal){
return sqlite3ValueText(pVal, SQLITE_UTF16BE);
}
const void *sqlite3_value_text16le(sqlite3_value *pVal){
return sqlite3ValueText(pVal, SQLITE_UTF16LE);
}
#endif /* SQLITE_OMIT_UTF16 */
/* EVIDENCE-OF: R-12793-43283 Every value in SQLite has one of five
** fundamental datatypes: 64-bit signed integer 64-bit IEEE floating
** point number string BLOB NULL
*/
int sqlite3_value_type(sqlite3_value* pVal){
static const u8 aType[] = {
SQLITE_BLOB, /* 0x00 (not possible) */
SQLITE_NULL, /* 0x01 NULL */
SQLITE_TEXT, /* 0x02 TEXT */
SQLITE_NULL, /* 0x03 (not possible) */
SQLITE_INTEGER, /* 0x04 INTEGER */
SQLITE_NULL, /* 0x05 (not possible) */
SQLITE_INTEGER, /* 0x06 INTEGER + TEXT */
SQLITE_NULL, /* 0x07 (not possible) */
SQLITE_FLOAT, /* 0x08 FLOAT */
SQLITE_NULL, /* 0x09 (not possible) */
SQLITE_FLOAT, /* 0x0a FLOAT + TEXT */
SQLITE_NULL, /* 0x0b (not possible) */
SQLITE_INTEGER, /* 0x0c (not possible) */
SQLITE_NULL, /* 0x0d (not possible) */
SQLITE_INTEGER, /* 0x0e (not possible) */
SQLITE_NULL, /* 0x0f (not possible) */
SQLITE_BLOB, /* 0x10 BLOB */
SQLITE_NULL, /* 0x11 (not possible) */
SQLITE_TEXT, /* 0x12 (not possible) */
SQLITE_NULL, /* 0x13 (not possible) */
SQLITE_INTEGER, /* 0x14 INTEGER + BLOB */
SQLITE_NULL, /* 0x15 (not possible) */
SQLITE_INTEGER, /* 0x16 (not possible) */
SQLITE_NULL, /* 0x17 (not possible) */
SQLITE_FLOAT, /* 0x18 FLOAT + BLOB */
SQLITE_NULL, /* 0x19 (not possible) */
SQLITE_FLOAT, /* 0x1a (not possible) */
SQLITE_NULL, /* 0x1b (not possible) */
SQLITE_INTEGER, /* 0x1c (not possible) */
SQLITE_NULL, /* 0x1d (not possible) */
SQLITE_INTEGER, /* 0x1e (not possible) */
SQLITE_NULL, /* 0x1f (not possible) */
SQLITE_FLOAT, /* 0x20 INTREAL */
SQLITE_NULL, /* 0x21 (not possible) */
SQLITE_TEXT, /* 0x22 INTREAL + TEXT */
SQLITE_NULL, /* 0x23 (not possible) */
SQLITE_FLOAT, /* 0x24 (not possible) */
SQLITE_NULL, /* 0x25 (not possible) */
SQLITE_FLOAT, /* 0x26 (not possible) */
SQLITE_NULL, /* 0x27 (not possible) */
SQLITE_FLOAT, /* 0x28 (not possible) */
SQLITE_NULL, /* 0x29 (not possible) */
SQLITE_FLOAT, /* 0x2a (not possible) */
SQLITE_NULL, /* 0x2b (not possible) */
SQLITE_FLOAT, /* 0x2c (not possible) */
SQLITE_NULL, /* 0x2d (not possible) */
SQLITE_FLOAT, /* 0x2e (not possible) */
SQLITE_NULL, /* 0x2f (not possible) */
SQLITE_BLOB, /* 0x30 (not possible) */
SQLITE_NULL, /* 0x31 (not possible) */
SQLITE_TEXT, /* 0x32 (not possible) */
SQLITE_NULL, /* 0x33 (not possible) */
SQLITE_FLOAT, /* 0x34 (not possible) */
SQLITE_NULL, /* 0x35 (not possible) */
SQLITE_FLOAT, /* 0x36 (not possible) */
SQLITE_NULL, /* 0x37 (not possible) */
SQLITE_FLOAT, /* 0x38 (not possible) */
SQLITE_NULL, /* 0x39 (not possible) */
SQLITE_FLOAT, /* 0x3a (not possible) */
SQLITE_NULL, /* 0x3b (not possible) */
SQLITE_FLOAT, /* 0x3c (not possible) */
SQLITE_NULL, /* 0x3d (not possible) */
SQLITE_FLOAT, /* 0x3e (not possible) */
SQLITE_NULL, /* 0x3f (not possible) */
};
#ifdef SQLITE_DEBUG
{
int eType = SQLITE_BLOB;
if( pVal->flags & MEM_Null ){
eType = SQLITE_NULL;
}else if( pVal->flags & (MEM_Real|MEM_IntReal) ){
eType = SQLITE_FLOAT;
}else if( pVal->flags & MEM_Int ){
eType = SQLITE_INTEGER;
}else if( pVal->flags & MEM_Str ){
eType = SQLITE_TEXT;
}
assert( eType == aType[pVal->flags&MEM_AffMask] );
}
#endif
return aType[pVal->flags&MEM_AffMask];
}
int sqlite3_value_encoding(sqlite3_value *pVal){
return pVal->enc;
}
/* Return true if a parameter to xUpdate represents an unchanged column */
int sqlite3_value_nochange(sqlite3_value *pVal){
return (pVal->flags&(MEM_Null|MEM_Zero))==(MEM_Null|MEM_Zero);
}
/* Return true if a parameter value originated from an sqlite3_bind() */
int sqlite3_value_frombind(sqlite3_value *pVal){
return (pVal->flags&MEM_FromBind)!=0;
}
/* Make a copy of an sqlite3_value object
*/
sqlite3_value *sqlite3_value_dup(const sqlite3_value *pOrig){
sqlite3_value *pNew;
if( pOrig==0 ) return 0;
pNew = sqlite3_malloc( sizeof(*pNew) );
if( pNew==0 ) return 0;
memset(pNew, 0, sizeof(*pNew));
memcpy(pNew, pOrig, MEMCELLSIZE);
pNew->flags &= ~MEM_Dyn;
pNew->db = 0;
if( pNew->flags&(MEM_Str|MEM_Blob) ){
pNew->flags &= ~(MEM_Static|MEM_Dyn);
pNew->flags |= MEM_Ephem;
if( sqlite3VdbeMemMakeWriteable(pNew)!=SQLITE_OK ){
sqlite3ValueFree(pNew);
pNew = 0;
}
}else if( pNew->flags & MEM_Null ){
/* Do not duplicate pointer values */
pNew->flags &= ~(MEM_Term|MEM_Subtype);
}
return pNew;
}
/* Destroy an sqlite3_value object previously obtained from
** sqlite3_value_dup().
*/
void sqlite3_value_free(sqlite3_value *pOld){
sqlite3ValueFree(pOld);
}
/**************************** sqlite3_result_ *******************************
** The following routines are used by user-defined functions to specify
** the function result.
**
** The setStrOrError() function calls sqlite3VdbeMemSetStr() to store the
** result as a string or blob. Appropriate errors are set if the string/blob
** is too big or if an OOM occurs.
**
** The invokeValueDestructor(P,X) routine invokes destructor function X()
** on value P is not going to be used and need to be destroyed.
*/
static void setResultStrOrError(
sqlite3_context *pCtx, /* Function context */
const char *z, /* String pointer */
int n, /* Bytes in string, or negative */
u8 enc, /* Encoding of z. 0 for BLOBs */
void (*xDel)(void*) /* Destructor function */
){
Mem *pOut = pCtx->pOut;
int rc = sqlite3VdbeMemSetStr(pOut, z, n, enc, xDel);
if( rc ){
if( rc==SQLITE_TOOBIG ){
sqlite3_result_error_toobig(pCtx);
}else{
/* The only errors possible from sqlite3VdbeMemSetStr are
** SQLITE_TOOBIG and SQLITE_NOMEM */
assert( rc==SQLITE_NOMEM );
sqlite3_result_error_nomem(pCtx);
}
return;
}
sqlite3VdbeChangeEncoding(pOut, pCtx->enc);
if( sqlite3VdbeMemTooBig(pOut) ){
sqlite3_result_error_toobig(pCtx);
}
}
static int invokeValueDestructor(
const void *p, /* Value to destroy */
void (*xDel)(void*), /* The destructor */
sqlite3_context *pCtx /* Set a SQLITE_TOOBIG error if no NULL */
){
assert( xDel!=SQLITE_DYNAMIC );
if( xDel==0 ){
/* noop */
}else if( xDel==SQLITE_TRANSIENT ){
/* noop */
}else{
xDel((void*)p);
}
sqlite3_result_error_toobig(pCtx);
return SQLITE_TOOBIG;
}
void sqlite3_result_blob(
sqlite3_context *pCtx,
const void *z,
int n,
void (*xDel)(void *)
){
assert( n>=0 );
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
setResultStrOrError(pCtx, z, n, 0, xDel);
}
void sqlite3_result_blob64(
sqlite3_context *pCtx,
const void *z,
sqlite3_uint64 n,
void (*xDel)(void *)
){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
assert( xDel!=SQLITE_DYNAMIC );
if( n>0x7fffffff ){
(void)invokeValueDestructor(z, xDel, pCtx);
}else{
setResultStrOrError(pCtx, z, (int)n, 0, xDel);
}
}
void sqlite3_result_double(sqlite3_context *pCtx, double rVal){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
sqlite3VdbeMemSetDouble(pCtx->pOut, rVal);
}
void sqlite3_result_error(sqlite3_context *pCtx, const char *z, int n){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
pCtx->isError = SQLITE_ERROR;
sqlite3VdbeMemSetStr(pCtx->pOut, z, n, SQLITE_UTF8, SQLITE_TRANSIENT);
}
#ifndef SQLITE_OMIT_UTF16
void sqlite3_result_error16(sqlite3_context *pCtx, const void *z, int n){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
pCtx->isError = SQLITE_ERROR;
sqlite3VdbeMemSetStr(pCtx->pOut, z, n, SQLITE_UTF16NATIVE, SQLITE_TRANSIENT);
}
#endif
void sqlite3_result_int(sqlite3_context *pCtx, int iVal){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
sqlite3VdbeMemSetInt64(pCtx->pOut, (i64)iVal);
}
void sqlite3_result_int64(sqlite3_context *pCtx, i64 iVal){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
sqlite3VdbeMemSetInt64(pCtx->pOut, iVal);
}
void sqlite3_result_null(sqlite3_context *pCtx){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
sqlite3VdbeMemSetNull(pCtx->pOut);
}
void sqlite3_result_pointer(
sqlite3_context *pCtx,
void *pPtr,
const char *zPType,
void (*xDestructor)(void*)
){
Mem *pOut = pCtx->pOut;
assert( sqlite3_mutex_held(pOut->db->mutex) );
sqlite3VdbeMemRelease(pOut);
pOut->flags = MEM_Null;
sqlite3VdbeMemSetPointer(pOut, pPtr, zPType, xDestructor);
}
void sqlite3_result_subtype(sqlite3_context *pCtx, unsigned int eSubtype){
Mem *pOut = pCtx->pOut;
assert( sqlite3_mutex_held(pOut->db->mutex) );
pOut->eSubtype = eSubtype & 0xff;
pOut->flags |= MEM_Subtype;
}
void sqlite3_result_text(
sqlite3_context *pCtx,
const char *z,
int n,
void (*xDel)(void *)
){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
setResultStrOrError(pCtx, z, n, SQLITE_UTF8, xDel);
}
void sqlite3_result_text64(
sqlite3_context *pCtx,
const char *z,
sqlite3_uint64 n,
void (*xDel)(void *),
unsigned char enc
){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
assert( xDel!=SQLITE_DYNAMIC );
if( enc==SQLITE_UTF16 ) enc = SQLITE_UTF16NATIVE;
if( n>0x7fffffff ){
(void)invokeValueDestructor(z, xDel, pCtx);
}else{
setResultStrOrError(pCtx, z, (int)n, enc, xDel);
}
}
#ifndef SQLITE_OMIT_UTF16
void sqlite3_result_text16(
sqlite3_context *pCtx,
const void *z,
int n,
void (*xDel)(void *)
){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
setResultStrOrError(pCtx, z, n, SQLITE_UTF16NATIVE, xDel);
}
void sqlite3_result_text16be(
sqlite3_context *pCtx,
const void *z,
int n,
void (*xDel)(void *)
){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
setResultStrOrError(pCtx, z, n, SQLITE_UTF16BE, xDel);
}
void sqlite3_result_text16le(
sqlite3_context *pCtx,
const void *z,
int n,
void (*xDel)(void *)
){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
setResultStrOrError(pCtx, z, n, SQLITE_UTF16LE, xDel);
}
#endif /* SQLITE_OMIT_UTF16 */
void sqlite3_result_value(sqlite3_context *pCtx, sqlite3_value *pValue){
Mem *pOut = pCtx->pOut;
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
sqlite3VdbeMemCopy(pOut, pValue);
sqlite3VdbeChangeEncoding(pOut, pCtx->enc);
if( sqlite3VdbeMemTooBig(pOut) ){
sqlite3_result_error_toobig(pCtx);
}
}
void sqlite3_result_zeroblob(sqlite3_context *pCtx, int n){
sqlite3_result_zeroblob64(pCtx, n>0 ? n : 0);
}
int sqlite3_result_zeroblob64(sqlite3_context *pCtx, u64 n){
Mem *pOut = pCtx->pOut;
assert( sqlite3_mutex_held(pOut->db->mutex) );
if( n>(u64)pOut->db->aLimit[SQLITE_LIMIT_LENGTH] ){
sqlite3_result_error_toobig(pCtx);
return SQLITE_TOOBIG;
}
#ifndef SQLITE_OMIT_INCRBLOB
sqlite3VdbeMemSetZeroBlob(pCtx->pOut, (int)n);
return SQLITE_OK;
#else
return sqlite3VdbeMemSetZeroBlob(pCtx->pOut, (int)n);
#endif
}
void sqlite3_result_error_code(sqlite3_context *pCtx, int errCode){
pCtx->isError = errCode ? errCode : -1;
#ifdef SQLITE_DEBUG
if( pCtx->pVdbe ) pCtx->pVdbe->rcApp = errCode;
#endif
if( pCtx->pOut->flags & MEM_Null ){
setResultStrOrError(pCtx, sqlite3ErrStr(errCode), -1, SQLITE_UTF8,
SQLITE_STATIC);
}
}
/* Force an SQLITE_TOOBIG error. */
void sqlite3_result_error_toobig(sqlite3_context *pCtx){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
pCtx->isError = SQLITE_TOOBIG;
sqlite3VdbeMemSetStr(pCtx->pOut, "string or blob too big", -1,
SQLITE_UTF8, SQLITE_STATIC);
}
/* An SQLITE_NOMEM error. */
void sqlite3_result_error_nomem(sqlite3_context *pCtx){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
sqlite3VdbeMemSetNull(pCtx->pOut);
pCtx->isError = SQLITE_NOMEM_BKPT;
sqlite3OomFault(pCtx->pOut->db);
}
#ifndef SQLITE_UNTESTABLE
/* Force the INT64 value currently stored as the result to be
** a MEM_IntReal value. See the SQLITE_TESTCTRL_RESULT_INTREAL
** test-control.
*/
void sqlite3ResultIntReal(sqlite3_context *pCtx){
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
if( pCtx->pOut->flags & MEM_Int ){
pCtx->pOut->flags &= ~MEM_Int;
pCtx->pOut->flags |= MEM_IntReal;
}
}
#endif
/*
** This function is called after a transaction has been committed. It
** invokes callbacks registered with sqlite3_wal_hook() as required.
*/
static int doWalCallbacks(sqlite3 *db){
int rc = SQLITE_OK;
#ifndef SQLITE_OMIT_WAL
int i;
for(i=0; i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
int nEntry;
sqlite3BtreeEnter(pBt);
nEntry = sqlite3PagerWalCallback(sqlite3BtreePager(pBt));
sqlite3BtreeLeave(pBt);
if( nEntry>0 && db->xWalCallback && rc==SQLITE_OK ){
rc = db->xWalCallback(db->pWalArg, db, db->aDb[i].zDbSName, nEntry);
}
}
}
#endif
return rc;
}
/*
** Execute the statement pStmt, either until a row of data is ready, the
** statement is completely executed or an error occurs.
**
** This routine implements the bulk of the logic behind the sqlite_step()
** API. The only thing omitted is the automatic recompile if a
** schema change has occurred. That detail is handled by the
** outer sqlite3_step() wrapper procedure.
*/
static int sqlite3Step(Vdbe *p){
sqlite3 *db;
int rc;
assert(p);
db = p->db;
if( p->eVdbeState!=VDBE_RUN_STATE ){
restart_step:
if( p->eVdbeState==VDBE_READY_STATE ){
if( p->expired ){
p->rc = SQLITE_SCHEMA;
rc = SQLITE_ERROR;
if( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 ){
/* If this statement was prepared using saved SQL and an
** error has occurred, then return the error code in p->rc to the
** caller. Set the error code in the database handle to the same
** value.
*/
rc = sqlite3VdbeTransferError(p);
}
goto end_of_step;
}
/* If there are no other statements currently running, then
** reset the interrupt flag. This prevents a call to sqlite3_interrupt
** from interrupting a statement that has not yet started.
*/
if( db->nVdbeActive==0 ){
AtomicStore(&db->u1.isInterrupted, 0);
}
assert( db->nVdbeWrite>0 || db->autoCommit==0
|| (db->nDeferredCons==0 && db->nDeferredImmCons==0)
);
#ifndef SQLITE_OMIT_TRACE
if( (db->mTrace & (SQLITE_TRACE_PROFILE|SQLITE_TRACE_XPROFILE))!=0
&& !db->init.busy && p->zSql ){
sqlite3OsCurrentTimeInt64(db->pVfs, &p->startTime);
}else{
assert( p->startTime==0 );
}
#endif
db->nVdbeActive++;
if( p->readOnly==0 ) db->nVdbeWrite++;
if( p->bIsReader ) db->nVdbeRead++;
p->pc = 0;
p->eVdbeState = VDBE_RUN_STATE;
}else
if( ALWAYS(p->eVdbeState==VDBE_HALT_STATE) ){
/* We used to require that sqlite3_reset() be called before retrying
** sqlite3_step() after any error or after SQLITE_DONE. But beginning
** with version 3.7.0, we changed this so that sqlite3_reset() would
** be called automatically instead of throwing the SQLITE_MISUSE error.
** This "automatic-reset" change is not technically an incompatibility,
** since any application that receives an SQLITE_MISUSE is broken by
** definition.
**
** Nevertheless, some published applications that were originally written
** for version 3.6.23 or earlier do in fact depend on SQLITE_MISUSE
** returns, and those were broken by the automatic-reset change. As a
** a work-around, the SQLITE_OMIT_AUTORESET compile-time restores the
** legacy behavior of returning SQLITE_MISUSE for cases where the
** previous sqlite3_step() returned something other than a SQLITE_LOCKED
** or SQLITE_BUSY error.
*/
#ifdef SQLITE_OMIT_AUTORESET
if( (rc = p->rc&0xff)==SQLITE_BUSY || rc==SQLITE_LOCKED ){
sqlite3_reset((sqlite3_stmt*)p);
}else{
return SQLITE_MISUSE_BKPT;
}
#else
sqlite3_reset((sqlite3_stmt*)p);
#endif
assert( p->eVdbeState==VDBE_READY_STATE );
goto restart_step;
}
}
#ifdef SQLITE_DEBUG
p->rcApp = SQLITE_OK;
#endif
#ifndef SQLITE_OMIT_EXPLAIN
if( p->explain ){
rc = sqlite3VdbeList(p);
}else
#endif /* SQLITE_OMIT_EXPLAIN */
{
db->nVdbeExec++;
rc = sqlite3VdbeExec(p);
db->nVdbeExec--;
}
if( rc==SQLITE_ROW ){
assert( p->rc==SQLITE_OK );
assert( db->mallocFailed==0 );
db->errCode = SQLITE_ROW;
return SQLITE_ROW;
}else{
#ifndef SQLITE_OMIT_TRACE
/* If the statement completed successfully, invoke the profile callback */
checkProfileCallback(db, p);
#endif
if( rc==SQLITE_DONE && db->autoCommit ){
assert( p->rc==SQLITE_OK );
p->rc = doWalCallbacks(db);
if( p->rc!=SQLITE_OK ){
rc = SQLITE_ERROR;
}
}else if( rc!=SQLITE_DONE && (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 ){
/* If this statement was prepared using saved SQL and an
** error has occurred, then return the error code in p->rc to the
** caller. Set the error code in the database handle to the same value.
*/
rc = sqlite3VdbeTransferError(p);
}
}
db->errCode = rc;
if( SQLITE_NOMEM==sqlite3ApiExit(p->db, p->rc) ){
p->rc = SQLITE_NOMEM_BKPT;
if( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 ) rc = p->rc;
}
end_of_step:
/* There are only a limited number of result codes allowed from the
** statements prepared using the legacy sqlite3_prepare() interface */
assert( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0
|| rc==SQLITE_ROW || rc==SQLITE_DONE || rc==SQLITE_ERROR
|| (rc&0xff)==SQLITE_BUSY || rc==SQLITE_MISUSE
);
return (rc&db->errMask);
}
/*
** This is the top-level implementation of sqlite3_step(). Call
** sqlite3Step() to do most of the work. If a schema error occurs,
** call sqlite3Reprepare() and try again.
*/
int sqlite3_step(sqlite3_stmt *pStmt){
int rc = SQLITE_OK; /* Result from sqlite3Step() */
Vdbe *v = (Vdbe*)pStmt; /* the prepared statement */
int cnt = 0; /* Counter to prevent infinite loop of reprepares */
sqlite3 *db; /* The database connection */
if( vdbeSafetyNotNull(v) ){
return SQLITE_MISUSE_BKPT;
}
db = v->db;
sqlite3_mutex_enter(db->mutex);
while( (rc = sqlite3Step(v))==SQLITE_SCHEMA
&& cnt++ < SQLITE_MAX_SCHEMA_RETRY ){
int savedPc = v->pc;
rc = sqlite3Reprepare(v);
if( rc!=SQLITE_OK ){
/* This case occurs after failing to recompile an sql statement.
** The error message from the SQL compiler has already been loaded
** into the database handle. This block copies the error message
** from the database handle into the statement and sets the statement
** program counter to 0 to ensure that when the statement is
** finalized or reset the parser error message is available via
** sqlite3_errmsg() and sqlite3_errcode().
*/
const char *zErr = (const char *)sqlite3_value_text(db->pErr);
sqlite3DbFree(db, v->zErrMsg);
if( !db->mallocFailed ){
v->zErrMsg = sqlite3DbStrDup(db, zErr);
v->rc = rc = sqlite3ApiExit(db, rc);
} else {
v->zErrMsg = 0;
v->rc = rc = SQLITE_NOMEM_BKPT;
}
break;
}
sqlite3_reset(pStmt);
if( savedPc>=0 ){
/* Setting minWriteFileFormat to 254 is a signal to the OP_Init and
** OP_Trace opcodes to *not* perform SQLITE_TRACE_STMT because it has
** already been done once on a prior invocation that failed due to
** SQLITE_SCHEMA. tag-20220401a */
v->minWriteFileFormat = 254;
}
assert( v->expired==0 );
}
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Extract the user data from a sqlite3_context structure and return a
** pointer to it.
*/
void *sqlite3_user_data(sqlite3_context *p){
assert( p && p->pFunc );
return p->pFunc->pUserData;
}
/*
** Extract the user data from a sqlite3_context structure and return a
** pointer to it.
**
** IMPLEMENTATION-OF: R-46798-50301 The sqlite3_context_db_handle() interface
** returns a copy of the pointer to the database connection (the 1st
** parameter) of the sqlite3_create_function() and
** sqlite3_create_function16() routines that originally registered the
** application defined function.
*/
sqlite3 *sqlite3_context_db_handle(sqlite3_context *p){
assert( p && p->pOut );
return p->pOut->db;
}
/*
** If this routine is invoked from within an xColumn method of a virtual
** table, then it returns true if and only if the the call is during an
** UPDATE operation and the value of the column will not be modified
** by the UPDATE.
**
** If this routine is called from any context other than within the
** xColumn method of a virtual table, then the return value is meaningless
** and arbitrary.
**
** Virtual table implements might use this routine to optimize their
** performance by substituting a NULL result, or some other light-weight
** value, as a signal to the xUpdate routine that the column is unchanged.
*/
int sqlite3_vtab_nochange(sqlite3_context *p){
assert( p );
return sqlite3_value_nochange(p->pOut);
}
/*
** Implementation of sqlite3_vtab_in_first() (if bNext==0) and
** sqlite3_vtab_in_next() (if bNext!=0).
*/
static int valueFromValueList(
sqlite3_value *pVal, /* Pointer to the ValueList object */
sqlite3_value **ppOut, /* Store the next value from the list here */
int bNext /* 1 for _next(). 0 for _first() */
){
int rc;
ValueList *pRhs;
*ppOut = 0;
if( pVal==0 ) return SQLITE_MISUSE;
pRhs = (ValueList*)sqlite3_value_pointer(pVal, "ValueList");
if( pRhs==0 ) return SQLITE_MISUSE;
if( bNext ){
rc = sqlite3BtreeNext(pRhs->pCsr, 0);
}else{
int dummy = 0;
rc = sqlite3BtreeFirst(pRhs->pCsr, &dummy);
assert( rc==SQLITE_OK || sqlite3BtreeEof(pRhs->pCsr) );
if( sqlite3BtreeEof(pRhs->pCsr) ) rc = SQLITE_DONE;
}
if( rc==SQLITE_OK ){
u32 sz; /* Size of current row in bytes */
Mem sMem; /* Raw content of current row */
memset(&sMem, 0, sizeof(sMem));
sz = sqlite3BtreePayloadSize(pRhs->pCsr);
rc = sqlite3VdbeMemFromBtreeZeroOffset(pRhs->pCsr,(int)sz,&sMem);
if( rc==SQLITE_OK ){
u8 *zBuf = (u8*)sMem.z;
u32 iSerial;
sqlite3_value *pOut = pRhs->pOut;
int iOff = 1 + getVarint32(&zBuf[1], iSerial);
sqlite3VdbeSerialGet(&zBuf[iOff], iSerial, pOut);
pOut->enc = ENC(pOut->db);
if( (pOut->flags & MEM_Ephem)!=0 && sqlite3VdbeMemMakeWriteable(pOut) ){
rc = SQLITE_NOMEM;
}else{
*ppOut = pOut;
}
}
sqlite3VdbeMemRelease(&sMem);
}
return rc;
}
/*
** Set the iterator value pVal to point to the first value in the set.
** Set (*ppOut) to point to this value before returning.
*/
int sqlite3_vtab_in_first(sqlite3_value *pVal, sqlite3_value **ppOut){
return valueFromValueList(pVal, ppOut, 0);
}
/*
** Set the iterator value pVal to point to the next value in the set.
** Set (*ppOut) to point to this value before returning.
*/
int sqlite3_vtab_in_next(sqlite3_value *pVal, sqlite3_value **ppOut){
return valueFromValueList(pVal, ppOut, 1);
}
/*
** Return the current time for a statement. If the current time
** is requested more than once within the same run of a single prepared
** statement, the exact same time is returned for each invocation regardless
** of the amount of time that elapses between invocations. In other words,
** the time returned is always the time of the first call.
*/
sqlite3_int64 sqlite3StmtCurrentTime(sqlite3_context *p){
int rc;
#ifndef SQLITE_ENABLE_STAT4
sqlite3_int64 *piTime = &p->pVdbe->iCurrentTime;
assert( p->pVdbe!=0 );
#else
sqlite3_int64 iTime = 0;
sqlite3_int64 *piTime = p->pVdbe!=0 ? &p->pVdbe->iCurrentTime : &iTime;
#endif
if( *piTime==0 ){
rc = sqlite3OsCurrentTimeInt64(p->pOut->db->pVfs, piTime);
if( rc ) *piTime = 0;
}
return *piTime;
}
/*
** Create a new aggregate context for p and return a pointer to
** its pMem->z element.
*/
static SQLITE_NOINLINE void *createAggContext(sqlite3_context *p, int nByte){
Mem *pMem = p->pMem;
assert( (pMem->flags & MEM_Agg)==0 );
if( nByte<=0 ){
sqlite3VdbeMemSetNull(pMem);
pMem->z = 0;
}else{
sqlite3VdbeMemClearAndResize(pMem, nByte);
pMem->flags = MEM_Agg;
pMem->u.pDef = p->pFunc;
if( pMem->z ){
memset(pMem->z, 0, nByte);
}
}
return (void*)pMem->z;
}
/*
** Allocate or return the aggregate context for a user function. A new
** context is allocated on the first call. Subsequent calls return the
** same context that was returned on prior calls.
*/
void *sqlite3_aggregate_context(sqlite3_context *p, int nByte){
assert( p && p->pFunc && p->pFunc->xFinalize );
assert( sqlite3_mutex_held(p->pOut->db->mutex) );
testcase( nByte<0 );
if( (p->pMem->flags & MEM_Agg)==0 ){
return createAggContext(p, nByte);
}else{
return (void*)p->pMem->z;
}
}
/*
** Return the auxiliary data pointer, if any, for the iArg'th argument to
** the user-function defined by pCtx.
**
** The left-most argument is 0.
**
** Undocumented behavior: If iArg is negative then access a cache of
** auxiliary data pointers that is available to all functions within a
** single prepared statement. The iArg values must match.
*/
void *sqlite3_get_auxdata(sqlite3_context *pCtx, int iArg){
AuxData *pAuxData;
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
#if SQLITE_ENABLE_STAT4
if( pCtx->pVdbe==0 ) return 0;
#else
assert( pCtx->pVdbe!=0 );
#endif
for(pAuxData=pCtx->pVdbe->pAuxData; pAuxData; pAuxData=pAuxData->pNextAux){
if( pAuxData->iAuxArg==iArg && (pAuxData->iAuxOp==pCtx->iOp || iArg<0) ){
return pAuxData->pAux;
}
}
return 0;
}
/*
** Set the auxiliary data pointer and delete function, for the iArg'th
** argument to the user-function defined by pCtx. Any previous value is
** deleted by calling the delete function specified when it was set.
**
** The left-most argument is 0.
**
** Undocumented behavior: If iArg is negative then make the data available
** to all functions within the current prepared statement using iArg as an
** access code.
*/
void sqlite3_set_auxdata(
sqlite3_context *pCtx,
int iArg,
void *pAux,
void (*xDelete)(void*)
){
AuxData *pAuxData;
Vdbe *pVdbe = pCtx->pVdbe;
assert( sqlite3_mutex_held(pCtx->pOut->db->mutex) );
#ifdef SQLITE_ENABLE_STAT4
if( pVdbe==0 ) goto failed;
#else
assert( pVdbe!=0 );
#endif
for(pAuxData=pVdbe->pAuxData; pAuxData; pAuxData=pAuxData->pNextAux){
if( pAuxData->iAuxArg==iArg && (pAuxData->iAuxOp==pCtx->iOp || iArg<0) ){
break;
}
}
if( pAuxData==0 ){
pAuxData = sqlite3DbMallocZero(pVdbe->db, sizeof(AuxData));
if( !pAuxData ) goto failed;
pAuxData->iAuxOp = pCtx->iOp;
pAuxData->iAuxArg = iArg;
pAuxData->pNextAux = pVdbe->pAuxData;
pVdbe->pAuxData = pAuxData;
if( pCtx->isError==0 ) pCtx->isError = -1;
}else if( pAuxData->xDeleteAux ){
pAuxData->xDeleteAux(pAuxData->pAux);
}
pAuxData->pAux = pAux;
pAuxData->xDeleteAux = xDelete;
return;
failed:
if( xDelete ){
xDelete(pAux);
}
}
#ifndef SQLITE_OMIT_DEPRECATED
/*
** Return the number of times the Step function of an aggregate has been
** called.
**
** This function is deprecated. Do not use it for new code. It is
** provide only to avoid breaking legacy code. New aggregate function
** implementations should keep their own counts within their aggregate
** context.
*/
int sqlite3_aggregate_count(sqlite3_context *p){
assert( p && p->pMem && p->pFunc && p->pFunc->xFinalize );
return p->pMem->n;
}
#endif
/*
** Return the number of columns in the result set for the statement pStmt.
*/
int sqlite3_column_count(sqlite3_stmt *pStmt){
Vdbe *pVm = (Vdbe *)pStmt;
return pVm ? pVm->nResColumn : 0;
}
/*
** Return the number of values available from the current row of the
** currently executing statement pStmt.
*/
int sqlite3_data_count(sqlite3_stmt *pStmt){
Vdbe *pVm = (Vdbe *)pStmt;
if( pVm==0 || pVm->pResultSet==0 ) return 0;
return pVm->nResColumn;
}
/*
** Return a pointer to static memory containing an SQL NULL value.
*/
static const Mem *columnNullValue(void){
/* Even though the Mem structure contains an element
** of type i64, on certain architectures (x86) with certain compiler
** switches (-Os), gcc may align this Mem object on a 4-byte boundary
** instead of an 8-byte one. This all works fine, except that when
** running with SQLITE_DEBUG defined the SQLite code sometimes assert()s
** that a Mem structure is located on an 8-byte boundary. To prevent
** these assert()s from failing, when building with SQLITE_DEBUG defined
** using gcc, we force nullMem to be 8-byte aligned using the magical
** __attribute__((aligned(8))) macro. */
static const Mem nullMem
#if defined(SQLITE_DEBUG) && defined(__GNUC__)
__attribute__((aligned(8)))
#endif
= {
/* .u = */ {0},
/* .z = */ (char*)0,
/* .n = */ (int)0,
/* .flags = */ (u16)MEM_Null,
/* .enc = */ (u8)0,
/* .eSubtype = */ (u8)0,
/* .db = */ (sqlite3*)0,
/* .szMalloc = */ (int)0,
/* .uTemp = */ (u32)0,
/* .zMalloc = */ (char*)0,
/* .xDel = */ (void(*)(void*))0,
#ifdef SQLITE_DEBUG
/* .pScopyFrom = */ (Mem*)0,
/* .mScopyFlags= */ 0,
#endif
};
return &nullMem;
}
/*
** Check to see if column iCol of the given statement is valid. If
** it is, return a pointer to the Mem for the value of that column.
** If iCol is not valid, return a pointer to a Mem which has a value
** of NULL.
*/
static Mem *columnMem(sqlite3_stmt *pStmt, int i){
Vdbe *pVm;
Mem *pOut;
pVm = (Vdbe *)pStmt;
if( pVm==0 ) return (Mem*)columnNullValue();
assert( pVm->db );
sqlite3_mutex_enter(pVm->db->mutex);
if( pVm->pResultSet!=0 && i<pVm->nResColumn && i>=0 ){
pOut = &pVm->pResultSet[i];
}else{
sqlite3Error(pVm->db, SQLITE_RANGE);
pOut = (Mem*)columnNullValue();
}
return pOut;
}
/*
** This function is called after invoking an sqlite3_value_XXX function on a
** column value (i.e. a value returned by evaluating an SQL expression in the
** select list of a SELECT statement) that may cause a malloc() failure. If
** malloc() has failed, the threads mallocFailed flag is cleared and the result
** code of statement pStmt set to SQLITE_NOMEM.
**
** Specifically, this is called from within:
**
** sqlite3_column_int()
** sqlite3_column_int64()
** sqlite3_column_text()
** sqlite3_column_text16()
** sqlite3_column_real()
** sqlite3_column_bytes()
** sqlite3_column_bytes16()
** sqiite3_column_blob()
*/
static void columnMallocFailure(sqlite3_stmt *pStmt)
{
/* If malloc() failed during an encoding conversion within an
** sqlite3_column_XXX API, then set the return code of the statement to
** SQLITE_NOMEM. The next call to _step() (if any) will return SQLITE_ERROR
** and _finalize() will return NOMEM.
*/
Vdbe *p = (Vdbe *)pStmt;
if( p ){
assert( p->db!=0 );
assert( sqlite3_mutex_held(p->db->mutex) );
p->rc = sqlite3ApiExit(p->db, p->rc);
sqlite3_mutex_leave(p->db->mutex);
}
}
/**************************** sqlite3_column_ *******************************
** The following routines are used to access elements of the current row
** in the result set.
*/
const void *sqlite3_column_blob(sqlite3_stmt *pStmt, int i){
const void *val;
val = sqlite3_value_blob( columnMem(pStmt,i) );
/* Even though there is no encoding conversion, value_blob() might
** need to call malloc() to expand the result of a zeroblob()
** expression.
*/
columnMallocFailure(pStmt);
return val;
}
int sqlite3_column_bytes(sqlite3_stmt *pStmt, int i){
int val = sqlite3_value_bytes( columnMem(pStmt,i) );
columnMallocFailure(pStmt);
return val;
}
int sqlite3_column_bytes16(sqlite3_stmt *pStmt, int i){
int val = sqlite3_value_bytes16( columnMem(pStmt,i) );
columnMallocFailure(pStmt);
return val;
}
double sqlite3_column_double(sqlite3_stmt *pStmt, int i){
double val = sqlite3_value_double( columnMem(pStmt,i) );
columnMallocFailure(pStmt);
return val;
}
int sqlite3_column_int(sqlite3_stmt *pStmt, int i){
int val = sqlite3_value_int( columnMem(pStmt,i) );
columnMallocFailure(pStmt);
return val;
}
sqlite_int64 sqlite3_column_int64(sqlite3_stmt *pStmt, int i){
sqlite_int64 val = sqlite3_value_int64( columnMem(pStmt,i) );
columnMallocFailure(pStmt);
return val;
}
const unsigned char *sqlite3_column_text(sqlite3_stmt *pStmt, int i){
const unsigned char *val = sqlite3_value_text( columnMem(pStmt,i) );
columnMallocFailure(pStmt);
return val;
}
sqlite3_value *sqlite3_column_value(sqlite3_stmt *pStmt, int i){
Mem *pOut = columnMem(pStmt, i);
if( pOut->flags&MEM_Static ){
pOut->flags &= ~MEM_Static;
pOut->flags |= MEM_Ephem;
}
columnMallocFailure(pStmt);
return (sqlite3_value *)pOut;
}
#ifndef SQLITE_OMIT_UTF16
const void *sqlite3_column_text16(sqlite3_stmt *pStmt, int i){
const void *val = sqlite3_value_text16( columnMem(pStmt,i) );
columnMallocFailure(pStmt);
return val;
}
#endif /* SQLITE_OMIT_UTF16 */
int sqlite3_column_type(sqlite3_stmt *pStmt, int i){
int iType = sqlite3_value_type( columnMem(pStmt,i) );
columnMallocFailure(pStmt);
return iType;
}
/*
** Convert the N-th element of pStmt->pColName[] into a string using
** xFunc() then return that string. If N is out of range, return 0.
**
** There are up to 5 names for each column. useType determines which
** name is returned. Here are the names:
**
** 0 The column name as it should be displayed for output
** 1 The datatype name for the column
** 2 The name of the database that the column derives from
** 3 The name of the table that the column derives from
** 4 The name of the table column that the result column derives from
**
** If the result is not a simple column reference (if it is an expression
** or a constant) then useTypes 2, 3, and 4 return NULL.
*/
static const void *columnName(
sqlite3_stmt *pStmt, /* The statement */
int N, /* Which column to get the name for */
int useUtf16, /* True to return the name as UTF16 */
int useType /* What type of name */
){
const void *ret;
Vdbe *p;
int n;
sqlite3 *db;
#ifdef SQLITE_ENABLE_API_ARMOR
if( pStmt==0 ){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
ret = 0;
p = (Vdbe *)pStmt;
db = p->db;
assert( db!=0 );
n = sqlite3_column_count(pStmt);
if( N<n && N>=0 ){
N += useType*n;
sqlite3_mutex_enter(db->mutex);
assert( db->mallocFailed==0 );
#ifndef SQLITE_OMIT_UTF16
if( useUtf16 ){
ret = sqlite3_value_text16((sqlite3_value*)&p->aColName[N]);
}else
#endif
{
ret = sqlite3_value_text((sqlite3_value*)&p->aColName[N]);
}
/* A malloc may have failed inside of the _text() call. If this
** is the case, clear the mallocFailed flag and return NULL.
*/
if( db->mallocFailed ){
sqlite3OomClear(db);
ret = 0;
}
sqlite3_mutex_leave(db->mutex);
}
return ret;
}
/*
** Return the name of the Nth column of the result set returned by SQL
** statement pStmt.
*/
const char *sqlite3_column_name(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 0, COLNAME_NAME);
}
#ifndef SQLITE_OMIT_UTF16
const void *sqlite3_column_name16(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 1, COLNAME_NAME);
}
#endif
/*
** Constraint: If you have ENABLE_COLUMN_METADATA then you must
** not define OMIT_DECLTYPE.
*/
#if defined(SQLITE_OMIT_DECLTYPE) && defined(SQLITE_ENABLE_COLUMN_METADATA)
# error "Must not define both SQLITE_OMIT_DECLTYPE \
and SQLITE_ENABLE_COLUMN_METADATA"
#endif
#ifndef SQLITE_OMIT_DECLTYPE
/*
** Return the column declaration type (if applicable) of the 'i'th column
** of the result set of SQL statement pStmt.
*/
const char *sqlite3_column_decltype(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 0, COLNAME_DECLTYPE);
}
#ifndef SQLITE_OMIT_UTF16
const void *sqlite3_column_decltype16(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 1, COLNAME_DECLTYPE);
}
#endif /* SQLITE_OMIT_UTF16 */
#endif /* SQLITE_OMIT_DECLTYPE */
#ifdef SQLITE_ENABLE_COLUMN_METADATA
/*
** Return the name of the database from which a result column derives.
** NULL is returned if the result column is an expression or constant or
** anything else which is not an unambiguous reference to a database column.
*/
const char *sqlite3_column_database_name(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 0, COLNAME_DATABASE);
}
#ifndef SQLITE_OMIT_UTF16
const void *sqlite3_column_database_name16(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 1, COLNAME_DATABASE);
}
#endif /* SQLITE_OMIT_UTF16 */
/*
** Return the name of the table from which a result column derives.
** NULL is returned if the result column is an expression or constant or
** anything else which is not an unambiguous reference to a database column.
*/
const char *sqlite3_column_table_name(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 0, COLNAME_TABLE);
}
#ifndef SQLITE_OMIT_UTF16
const void *sqlite3_column_table_name16(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 1, COLNAME_TABLE);
}
#endif /* SQLITE_OMIT_UTF16 */
/*
** Return the name of the table column from which a result column derives.
** NULL is returned if the result column is an expression or constant or
** anything else which is not an unambiguous reference to a database column.
*/
const char *sqlite3_column_origin_name(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 0, COLNAME_COLUMN);
}
#ifndef SQLITE_OMIT_UTF16
const void *sqlite3_column_origin_name16(sqlite3_stmt *pStmt, int N){
return columnName(pStmt, N, 1, COLNAME_COLUMN);
}
#endif /* SQLITE_OMIT_UTF16 */
#endif /* SQLITE_ENABLE_COLUMN_METADATA */
/******************************* sqlite3_bind_ ***************************
**
** Routines used to attach values to wildcards in a compiled SQL statement.
*/
/*
** Unbind the value bound to variable i in virtual machine p. This is the
** the same as binding a NULL value to the column. If the "i" parameter is
** out of range, then SQLITE_RANGE is returned. Othewise SQLITE_OK.
**
** A successful evaluation of this routine acquires the mutex on p.
** the mutex is released if any kind of error occurs.
**
** The error code stored in database p->db is overwritten with the return
** value in any case.
*/
static int vdbeUnbind(Vdbe *p, unsigned int i){
Mem *pVar;
if( vdbeSafetyNotNull(p) ){
return SQLITE_MISUSE_BKPT;
}
sqlite3_mutex_enter(p->db->mutex);
if( p->eVdbeState!=VDBE_READY_STATE ){
sqlite3Error(p->db, SQLITE_MISUSE);
sqlite3_mutex_leave(p->db->mutex);
sqlite3_log(SQLITE_MISUSE,
"bind on a busy prepared statement: [%s]", p->zSql);
return SQLITE_MISUSE_BKPT;
}
if( i>=(unsigned int)p->nVar ){
sqlite3Error(p->db, SQLITE_RANGE);
sqlite3_mutex_leave(p->db->mutex);
return SQLITE_RANGE;
}
pVar = &p->aVar[i];
sqlite3VdbeMemRelease(pVar);
pVar->flags = MEM_Null;
p->db->errCode = SQLITE_OK;
/* If the bit corresponding to this variable in Vdbe.expmask is set, then
** binding a new value to this variable invalidates the current query plan.
**
** IMPLEMENTATION-OF: R-57496-20354 If the specific value bound to a host
** parameter in the WHERE clause might influence the choice of query plan
** for a statement, then the statement will be automatically recompiled,
** as if there had been a schema change, on the first sqlite3_step() call
** following any change to the bindings of that parameter.
*/
assert( (p->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || p->expmask==0 );
if( p->expmask!=0 && (p->expmask & (i>=31 ? 0x80000000 : (u32)1<<i))!=0 ){
p->expired = 1;
}
return SQLITE_OK;
}
/*
** Bind a text or BLOB value.
*/
static int bindText(
sqlite3_stmt *pStmt, /* The statement to bind against */
int i, /* Index of the parameter to bind */
const void *zData, /* Pointer to the data to be bound */
i64 nData, /* Number of bytes of data to be bound */
void (*xDel)(void*), /* Destructor for the data */
u8 encoding /* Encoding for the data */
){
Vdbe *p = (Vdbe *)pStmt;
Mem *pVar;
int rc;
rc = vdbeUnbind(p, (u32)(i-1));
if( rc==SQLITE_OK ){
if( zData!=0 ){
pVar = &p->aVar[i-1];
rc = sqlite3VdbeMemSetStr(pVar, zData, nData, encoding, xDel);
if( rc==SQLITE_OK && encoding!=0 ){
rc = sqlite3VdbeChangeEncoding(pVar, ENC(p->db));
}
if( rc ){
sqlite3Error(p->db, rc);
rc = sqlite3ApiExit(p->db, rc);
}
}
sqlite3_mutex_leave(p->db->mutex);
}else if( xDel!=SQLITE_STATIC && xDel!=SQLITE_TRANSIENT ){
xDel((void*)zData);
}
return rc;
}
/*
** Bind a blob value to an SQL statement variable.
*/
int sqlite3_bind_blob(
sqlite3_stmt *pStmt,
int i,
const void *zData,
int nData,
void (*xDel)(void*)
){
#ifdef SQLITE_ENABLE_API_ARMOR
if( nData<0 ) return SQLITE_MISUSE_BKPT;
#endif
return bindText(pStmt, i, zData, nData, xDel, 0);
}
int sqlite3_bind_blob64(
sqlite3_stmt *pStmt,
int i,
const void *zData,
sqlite3_uint64 nData,
void (*xDel)(void*)
){
assert( xDel!=SQLITE_DYNAMIC );
return bindText(pStmt, i, zData, nData, xDel, 0);
}
int sqlite3_bind_double(sqlite3_stmt *pStmt, int i, double rValue){
int rc;
Vdbe *p = (Vdbe *)pStmt;
rc = vdbeUnbind(p, (u32)(i-1));
if( rc==SQLITE_OK ){
sqlite3VdbeMemSetDouble(&p->aVar[i-1], rValue);
sqlite3_mutex_leave(p->db->mutex);
}
return rc;
}
int sqlite3_bind_int(sqlite3_stmt *p, int i, int iValue){
return sqlite3_bind_int64(p, i, (i64)iValue);
}
int sqlite3_bind_int64(sqlite3_stmt *pStmt, int i, sqlite_int64 iValue){
int rc;
Vdbe *p = (Vdbe *)pStmt;
rc = vdbeUnbind(p, (u32)(i-1));
if( rc==SQLITE_OK ){
sqlite3VdbeMemSetInt64(&p->aVar[i-1], iValue);
sqlite3_mutex_leave(p->db->mutex);
}
return rc;
}
int sqlite3_bind_null(sqlite3_stmt *pStmt, int i){
int rc;
Vdbe *p = (Vdbe*)pStmt;
rc = vdbeUnbind(p, (u32)(i-1));
if( rc==SQLITE_OK ){
sqlite3_mutex_leave(p->db->mutex);
}
return rc;
}
int sqlite3_bind_pointer(
sqlite3_stmt *pStmt,
int i,
void *pPtr,
const char *zPTtype,
void (*xDestructor)(void*)
){
int rc;
Vdbe *p = (Vdbe*)pStmt;
rc = vdbeUnbind(p, (u32)(i-1));
if( rc==SQLITE_OK ){
sqlite3VdbeMemSetPointer(&p->aVar[i-1], pPtr, zPTtype, xDestructor);
sqlite3_mutex_leave(p->db->mutex);
}else if( xDestructor ){
xDestructor(pPtr);
}
return rc;
}
int sqlite3_bind_text(
sqlite3_stmt *pStmt,
int i,
const char *zData,
int nData,
void (*xDel)(void*)
){
return bindText(pStmt, i, zData, nData, xDel, SQLITE_UTF8);
}
int sqlite3_bind_text64(
sqlite3_stmt *pStmt,
int i,
const char *zData,
sqlite3_uint64 nData,
void (*xDel)(void*),
unsigned char enc
){
assert( xDel!=SQLITE_DYNAMIC );
if( enc==SQLITE_UTF16 ) enc = SQLITE_UTF16NATIVE;
return bindText(pStmt, i, zData, nData, xDel, enc);
}
#ifndef SQLITE_OMIT_UTF16
int sqlite3_bind_text16(
sqlite3_stmt *pStmt,
int i,
const void *zData,
int nData,
void (*xDel)(void*)
){
return bindText(pStmt, i, zData, nData, xDel, SQLITE_UTF16NATIVE);
}
#endif /* SQLITE_OMIT_UTF16 */
int sqlite3_bind_value(sqlite3_stmt *pStmt, int i, const sqlite3_value *pValue){
int rc;
switch( sqlite3_value_type((sqlite3_value*)pValue) ){
case SQLITE_INTEGER: {
rc = sqlite3_bind_int64(pStmt, i, pValue->u.i);
break;
}
case SQLITE_FLOAT: {
assert( pValue->flags & (MEM_Real|MEM_IntReal) );
rc = sqlite3_bind_double(pStmt, i,
(pValue->flags & MEM_Real) ? pValue->u.r : (double)pValue->u.i
);
break;
}
case SQLITE_BLOB: {
if( pValue->flags & MEM_Zero ){
rc = sqlite3_bind_zeroblob(pStmt, i, pValue->u.nZero);
}else{
rc = sqlite3_bind_blob(pStmt, i, pValue->z, pValue->n,SQLITE_TRANSIENT);
}
break;
}
case SQLITE_TEXT: {
rc = bindText(pStmt,i, pValue->z, pValue->n, SQLITE_TRANSIENT,
pValue->enc);
break;
}
default: {
rc = sqlite3_bind_null(pStmt, i);
break;
}
}
return rc;
}
int sqlite3_bind_zeroblob(sqlite3_stmt *pStmt, int i, int n){
int rc;
Vdbe *p = (Vdbe *)pStmt;
rc = vdbeUnbind(p, (u32)(i-1));
if( rc==SQLITE_OK ){
#ifndef SQLITE_OMIT_INCRBLOB
sqlite3VdbeMemSetZeroBlob(&p->aVar[i-1], n);
#else
rc = sqlite3VdbeMemSetZeroBlob(&p->aVar[i-1], n);
#endif
sqlite3_mutex_leave(p->db->mutex);
}
return rc;
}
int sqlite3_bind_zeroblob64(sqlite3_stmt *pStmt, int i, sqlite3_uint64 n){
int rc;
Vdbe *p = (Vdbe *)pStmt;
sqlite3_mutex_enter(p->db->mutex);
if( n>(u64)p->db->aLimit[SQLITE_LIMIT_LENGTH] ){
rc = SQLITE_TOOBIG;
}else{
assert( (n & 0x7FFFFFFF)==n );
rc = sqlite3_bind_zeroblob(pStmt, i, n);
}
rc = sqlite3ApiExit(p->db, rc);
sqlite3_mutex_leave(p->db->mutex);
return rc;
}
/*
** Return the number of wildcards that can be potentially bound to.
** This routine is added to support DBD::SQLite.
*/
int sqlite3_bind_parameter_count(sqlite3_stmt *pStmt){
Vdbe *p = (Vdbe*)pStmt;
return p ? p->nVar : 0;
}
/*
** Return the name of a wildcard parameter. Return NULL if the index
** is out of range or if the wildcard is unnamed.
**
** The result is always UTF-8.
*/
const char *sqlite3_bind_parameter_name(sqlite3_stmt *pStmt, int i){
Vdbe *p = (Vdbe*)pStmt;
if( p==0 ) return 0;
return sqlite3VListNumToName(p->pVList, i);
}
/*
** Given a wildcard parameter name, return the index of the variable
** with that name. If there is no variable with the given name,
** return 0.
*/
int sqlite3VdbeParameterIndex(Vdbe *p, const char *zName, int nName){
if( p==0 || zName==0 ) return 0;
return sqlite3VListNameToNum(p->pVList, zName, nName);
}
int sqlite3_bind_parameter_index(sqlite3_stmt *pStmt, const char *zName){
return sqlite3VdbeParameterIndex((Vdbe*)pStmt, zName, sqlite3Strlen30(zName));
}
/*
** Transfer all bindings from the first statement over to the second.
*/
int sqlite3TransferBindings(sqlite3_stmt *pFromStmt, sqlite3_stmt *pToStmt){
Vdbe *pFrom = (Vdbe*)pFromStmt;
Vdbe *pTo = (Vdbe*)pToStmt;
int i;
assert( pTo->db==pFrom->db );
assert( pTo->nVar==pFrom->nVar );
sqlite3_mutex_enter(pTo->db->mutex);
for(i=0; i<pFrom->nVar; i++){
sqlite3VdbeMemMove(&pTo->aVar[i], &pFrom->aVar[i]);
}
sqlite3_mutex_leave(pTo->db->mutex);
return SQLITE_OK;
}
#ifndef SQLITE_OMIT_DEPRECATED
/*
** Deprecated external interface. Internal/core SQLite code
** should call sqlite3TransferBindings.
**
** It is misuse to call this routine with statements from different
** database connections. But as this is a deprecated interface, we
** will not bother to check for that condition.
**
** If the two statements contain a different number of bindings, then
** an SQLITE_ERROR is returned. Nothing else can go wrong, so otherwise
** SQLITE_OK is returned.
*/
int sqlite3_transfer_bindings(sqlite3_stmt *pFromStmt, sqlite3_stmt *pToStmt){
Vdbe *pFrom = (Vdbe*)pFromStmt;
Vdbe *pTo = (Vdbe*)pToStmt;
if( pFrom->nVar!=pTo->nVar ){
return SQLITE_ERROR;
}
assert( (pTo->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || pTo->expmask==0 );
if( pTo->expmask ){
pTo->expired = 1;
}
assert( (pFrom->prepFlags & SQLITE_PREPARE_SAVESQL)!=0 || pFrom->expmask==0 );
if( pFrom->expmask ){
pFrom->expired = 1;
}
return sqlite3TransferBindings(pFromStmt, pToStmt);
}
#endif
/*
** Return the sqlite3* database handle to which the prepared statement given
** in the argument belongs. This is the same database handle that was
** the first argument to the sqlite3_prepare() that was used to create
** the statement in the first place.
*/
sqlite3 *sqlite3_db_handle(sqlite3_stmt *pStmt){
return pStmt ? ((Vdbe*)pStmt)->db : 0;
}
/*
** Return true if the prepared statement is guaranteed to not modify the
** database.
*/
int sqlite3_stmt_readonly(sqlite3_stmt *pStmt){
return pStmt ? ((Vdbe*)pStmt)->readOnly : 1;
}
/*
** Return 1 if the statement is an EXPLAIN and return 2 if the
** statement is an EXPLAIN QUERY PLAN
*/
int sqlite3_stmt_isexplain(sqlite3_stmt *pStmt){
return pStmt ? ((Vdbe*)pStmt)->explain : 0;
}
/*
** Return true if the prepared statement is in need of being reset.
*/
int sqlite3_stmt_busy(sqlite3_stmt *pStmt){
Vdbe *v = (Vdbe*)pStmt;
return v!=0 && v->eVdbeState==VDBE_RUN_STATE;
}
/*
** Return a pointer to the next prepared statement after pStmt associated
** with database connection pDb. If pStmt is NULL, return the first
** prepared statement for the database connection. Return NULL if there
** are no more.
*/
sqlite3_stmt *sqlite3_next_stmt(sqlite3 *pDb, sqlite3_stmt *pStmt){
sqlite3_stmt *pNext;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(pDb) ){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
sqlite3_mutex_enter(pDb->mutex);
if( pStmt==0 ){
pNext = (sqlite3_stmt*)pDb->pVdbe;
}else{
pNext = (sqlite3_stmt*)((Vdbe*)pStmt)->pVNext;
}
sqlite3_mutex_leave(pDb->mutex);
return pNext;
}
/*
** Return the value of a status counter for a prepared statement
*/
int sqlite3_stmt_status(sqlite3_stmt *pStmt, int op, int resetFlag){
Vdbe *pVdbe = (Vdbe*)pStmt;
u32 v;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !pStmt
|| (op!=SQLITE_STMTSTATUS_MEMUSED && (op<0||op>=ArraySize(pVdbe->aCounter)))
){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
if( op==SQLITE_STMTSTATUS_MEMUSED ){
sqlite3 *db = pVdbe->db;
sqlite3_mutex_enter(db->mutex);
v = 0;
db->pnBytesFreed = (int*)&v;
assert( db->lookaside.pEnd==db->lookaside.pTrueEnd );
db->lookaside.pEnd = db->lookaside.pStart;
sqlite3VdbeDelete(pVdbe);
db->pnBytesFreed = 0;
db->lookaside.pEnd = db->lookaside.pTrueEnd;
sqlite3_mutex_leave(db->mutex);
}else{
v = pVdbe->aCounter[op];
if( resetFlag ) pVdbe->aCounter[op] = 0;
}
return (int)v;
}
/*
** Return the SQL associated with a prepared statement
*/
const char *sqlite3_sql(sqlite3_stmt *pStmt){
Vdbe *p = (Vdbe *)pStmt;
return p ? p->zSql : 0;
}
/*
** Return the SQL associated with a prepared statement with
** bound parameters expanded. Space to hold the returned string is
** obtained from sqlite3_malloc(). The caller is responsible for
** freeing the returned string by passing it to sqlite3_free().
**
** The SQLITE_TRACE_SIZE_LIMIT puts an upper bound on the size of
** expanded bound parameters.
*/
char *sqlite3_expanded_sql(sqlite3_stmt *pStmt){
#ifdef SQLITE_OMIT_TRACE
return 0;
#else
char *z = 0;
const char *zSql = sqlite3_sql(pStmt);
if( zSql ){
Vdbe *p = (Vdbe *)pStmt;
sqlite3_mutex_enter(p->db->mutex);
z = sqlite3VdbeExpandSql(p, zSql);
sqlite3_mutex_leave(p->db->mutex);
}
return z;
#endif
}
#ifdef SQLITE_ENABLE_NORMALIZE
/*
** Return the normalized SQL associated with a prepared statement.
*/
const char *sqlite3_normalized_sql(sqlite3_stmt *pStmt){
Vdbe *p = (Vdbe *)pStmt;
if( p==0 ) return 0;
if( p->zNormSql==0 && ALWAYS(p->zSql!=0) ){
sqlite3_mutex_enter(p->db->mutex);
p->zNormSql = sqlite3Normalize(p, p->zSql);
sqlite3_mutex_leave(p->db->mutex);
}
return p->zNormSql;
}
#endif /* SQLITE_ENABLE_NORMALIZE */
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
/*
** Allocate and populate an UnpackedRecord structure based on the serialized
** record in nKey/pKey. Return a pointer to the new UnpackedRecord structure
** if successful, or a NULL pointer if an OOM error is encountered.
*/
static UnpackedRecord *vdbeUnpackRecord(
KeyInfo *pKeyInfo,
int nKey,
const void *pKey
){
UnpackedRecord *pRet; /* Return value */
pRet = sqlite3VdbeAllocUnpackedRecord(pKeyInfo);
if( pRet ){
memset(pRet->aMem, 0, sizeof(Mem)*(pKeyInfo->nKeyField+1));
sqlite3VdbeRecordUnpack(pKeyInfo, nKey, pKey, pRet);
}
return pRet;
}
/*
** This function is called from within a pre-update callback to retrieve
** a field of the row currently being updated or deleted.
*/
int sqlite3_preupdate_old(sqlite3 *db, int iIdx, sqlite3_value **ppValue){
PreUpdate *p = db->pPreUpdate;
Mem *pMem;
int rc = SQLITE_OK;
/* Test that this call is being made from within an SQLITE_DELETE or
** SQLITE_UPDATE pre-update callback, and that iIdx is within range. */
if( !p || p->op==SQLITE_INSERT ){
rc = SQLITE_MISUSE_BKPT;
goto preupdate_old_out;
}
if( p->pPk ){
iIdx = sqlite3TableColumnToIndex(p->pPk, iIdx);
}
if( iIdx>=p->pCsr->nField || iIdx<0 ){
rc = SQLITE_RANGE;
goto preupdate_old_out;
}
/* If the old.* record has not yet been loaded into memory, do so now. */
if( p->pUnpacked==0 ){
u32 nRec;
u8 *aRec;
assert( p->pCsr->eCurType==CURTYPE_BTREE );
nRec = sqlite3BtreePayloadSize(p->pCsr->uc.pCursor);
aRec = sqlite3DbMallocRaw(db, nRec);
if( !aRec ) goto preupdate_old_out;
rc = sqlite3BtreePayload(p->pCsr->uc.pCursor, 0, nRec, aRec);
if( rc==SQLITE_OK ){
p->pUnpacked = vdbeUnpackRecord(&p->keyinfo, nRec, aRec);
if( !p->pUnpacked ) rc = SQLITE_NOMEM;
}
if( rc!=SQLITE_OK ){
sqlite3DbFree(db, aRec);
goto preupdate_old_out;
}
p->aRecord = aRec;
}
pMem = *ppValue = &p->pUnpacked->aMem[iIdx];
if( iIdx==p->pTab->iPKey ){
sqlite3VdbeMemSetInt64(pMem, p->iKey1);
}else if( iIdx>=p->pUnpacked->nField ){
*ppValue = (sqlite3_value *)columnNullValue();
}else if( p->pTab->aCol[iIdx].affinity==SQLITE_AFF_REAL ){
if( pMem->flags & (MEM_Int|MEM_IntReal) ){
testcase( pMem->flags & MEM_Int );
testcase( pMem->flags & MEM_IntReal );
sqlite3VdbeMemRealify(pMem);
}
}
preupdate_old_out:
sqlite3Error(db, rc);
return sqlite3ApiExit(db, rc);
}
#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
/*
** This function is called from within a pre-update callback to retrieve
** the number of columns in the row being updated, deleted or inserted.
*/
int sqlite3_preupdate_count(sqlite3 *db){
PreUpdate *p = db->pPreUpdate;
return (p ? p->keyinfo.nKeyField : 0);
}
#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
/*
** This function is designed to be called from within a pre-update callback
** only. It returns zero if the change that caused the callback was made
** immediately by a user SQL statement. Or, if the change was made by a
** trigger program, it returns the number of trigger programs currently
** on the stack (1 for a top-level trigger, 2 for a trigger fired by a
** top-level trigger etc.).
**
** For the purposes of the previous paragraph, a foreign key CASCADE, SET NULL
** or SET DEFAULT action is considered a trigger.
*/
int sqlite3_preupdate_depth(sqlite3 *db){
PreUpdate *p = db->pPreUpdate;
return (p ? p->v->nFrame : 0);
}
#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
/*
** This function is designed to be called from within a pre-update callback
** only.
*/
int sqlite3_preupdate_blobwrite(sqlite3 *db){
PreUpdate *p = db->pPreUpdate;
return (p ? p->iBlobWrite : -1);
}
#endif
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
/*
** This function is called from within a pre-update callback to retrieve
** a field of the row currently being updated or inserted.
*/
int sqlite3_preupdate_new(sqlite3 *db, int iIdx, sqlite3_value **ppValue){
PreUpdate *p = db->pPreUpdate;
int rc = SQLITE_OK;
Mem *pMem;
if( !p || p->op==SQLITE_DELETE ){
rc = SQLITE_MISUSE_BKPT;
goto preupdate_new_out;
}
if( p->pPk && p->op!=SQLITE_UPDATE ){
iIdx = sqlite3TableColumnToIndex(p->pPk, iIdx);
}
if( iIdx>=p->pCsr->nField || iIdx<0 ){
rc = SQLITE_RANGE;
goto preupdate_new_out;
}
if( p->op==SQLITE_INSERT ){
/* For an INSERT, memory cell p->iNewReg contains the serialized record
** that is being inserted. Deserialize it. */
UnpackedRecord *pUnpack = p->pNewUnpacked;
if( !pUnpack ){
Mem *pData = &p->v->aMem[p->iNewReg];
rc = ExpandBlob(pData);
if( rc!=SQLITE_OK ) goto preupdate_new_out;
pUnpack = vdbeUnpackRecord(&p->keyinfo, pData->n, pData->z);
if( !pUnpack ){
rc = SQLITE_NOMEM;
goto preupdate_new_out;
}
p->pNewUnpacked = pUnpack;
}
pMem = &pUnpack->aMem[iIdx];
if( iIdx==p->pTab->iPKey ){
sqlite3VdbeMemSetInt64(pMem, p->iKey2);
}else if( iIdx>=pUnpack->nField ){
pMem = (sqlite3_value *)columnNullValue();
}
}else{
/* For an UPDATE, memory cell (p->iNewReg+1+iIdx) contains the required
** value. Make a copy of the cell contents and return a pointer to it.
** It is not safe to return a pointer to the memory cell itself as the
** caller may modify the value text encoding.
*/
assert( p->op==SQLITE_UPDATE );
if( !p->aNew ){
p->aNew = (Mem *)sqlite3DbMallocZero(db, sizeof(Mem) * p->pCsr->nField);
if( !p->aNew ){
rc = SQLITE_NOMEM;
goto preupdate_new_out;
}
}
assert( iIdx>=0 && iIdx<p->pCsr->nField );
pMem = &p->aNew[iIdx];
if( pMem->flags==0 ){
if( iIdx==p->pTab->iPKey ){
sqlite3VdbeMemSetInt64(pMem, p->iKey2);
}else{
rc = sqlite3VdbeMemCopy(pMem, &p->v->aMem[p->iNewReg+1+iIdx]);
if( rc!=SQLITE_OK ) goto preupdate_new_out;
}
}
}
*ppValue = pMem;
preupdate_new_out:
sqlite3Error(db, rc);
return sqlite3ApiExit(db, rc);
}
#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
/*
** Return status data for a single loop within query pStmt.
*/
int sqlite3_stmt_scanstatus(
sqlite3_stmt *pStmt, /* Prepared statement being queried */
int idx, /* Index of loop to report on */
int iScanStatusOp, /* Which metric to return */
void *pOut /* OUT: Write the answer here */
){
Vdbe *p = (Vdbe*)pStmt;
ScanStatus *pScan;
if( idx<0 || idx>=p->nScan ) return 1;
pScan = &p->aScan[idx];
switch( iScanStatusOp ){
case SQLITE_SCANSTAT_NLOOP: {
*(sqlite3_int64*)pOut = p->anExec[pScan->addrLoop];
break;
}
case SQLITE_SCANSTAT_NVISIT: {
*(sqlite3_int64*)pOut = p->anExec[pScan->addrVisit];
break;
}
case SQLITE_SCANSTAT_EST: {
double r = 1.0;
LogEst x = pScan->nEst;
while( x<100 ){
x += 10;
r *= 0.5;
}
*(double*)pOut = r*sqlite3LogEstToInt(x);
break;
}
case SQLITE_SCANSTAT_NAME: {
*(const char**)pOut = pScan->zName;
break;
}
case SQLITE_SCANSTAT_EXPLAIN: {
if( pScan->addrExplain ){
*(const char**)pOut = p->aOp[ pScan->addrExplain ].p4.z;
}else{
*(const char**)pOut = 0;
}
break;
}
case SQLITE_SCANSTAT_SELECTID: {
if( pScan->addrExplain ){
*(int*)pOut = p->aOp[ pScan->addrExplain ].p1;
}else{
*(int*)pOut = -1;
}
break;
}
default: {
return 1;
}
}
return 0;
}
/*
** Zero all counters associated with the sqlite3_stmt_scanstatus() data.
*/
void sqlite3_stmt_scanstatus_reset(sqlite3_stmt *pStmt){
Vdbe *p = (Vdbe*)pStmt;
memset(p->anExec, 0, p->nOp * sizeof(i64));
}
#endif /* SQLITE_ENABLE_STMT_SCANSTATUS */
| 66,935 | 2,172 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/walker.shell.c | #include "third_party/sqlite3/walker.c"
| 40 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/os_common.h | /*
** 2004 May 22
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains macros and a little bit of code that is common to
** all of the platform-specific files (os_*.c) and is #included into those
** files.
**
** This file should be #included by the os_*.c files only. It is not a
** general purpose header file.
*/
#ifndef _OS_COMMON_H_
#define _OS_COMMON_H_
/*
** At least two bugs have slipped in because we changed the MEMORY_DEBUG
** macro to SQLITE_DEBUG and some older makefiles have not yet made the
** switch. The following code should catch this problem at compile-time.
*/
#ifdef MEMORY_DEBUG
# error "The MEMORY_DEBUG macro is obsolete. Use SQLITE_DEBUG instead."
#endif
/*
** Macros for performance tracing. Normally turned off. Only works
** on i486 hardware.
*/
#ifdef SQLITE_PERFORMANCE_TRACE
/*
** hwtime.h contains inline assembler code for implementing
** high-performance timing routines.
*/
#include "third_party/sqlite3/hwtime.inc"
static sqlite_uint64 g_start;
static sqlite_uint64 g_elapsed;
#define TIMER_START g_start=sqlite3Hwtime()
#define TIMER_END g_elapsed=sqlite3Hwtime()-g_start
#define TIMER_ELAPSED g_elapsed
#else
#define TIMER_START
#define TIMER_END
#define TIMER_ELAPSED ((sqlite_uint64)0)
#endif
/*
** If we compile with the SQLITE_TEST macro set, then the following block
** of code will give us the ability to simulate a disk I/O error. This
** is used for testing the I/O recovery logic.
*/
#if defined(SQLITE_TEST)
extern int sqlite3_io_error_hit;
extern int sqlite3_io_error_hardhit;
extern int sqlite3_io_error_pending;
extern int sqlite3_io_error_persist;
extern int sqlite3_io_error_benign;
extern int sqlite3_diskfull_pending;
extern int sqlite3_diskfull;
#define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)
#define SimulateIOError(CODE) \
if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \
|| sqlite3_io_error_pending-- == 1 ) \
{ local_ioerr(); CODE; }
static void local_ioerr(){
IOTRACE(("IOERR\n"));
sqlite3_io_error_hit++;
if( !sqlite3_io_error_benign ) sqlite3_io_error_hardhit++;
}
#define SimulateDiskfullError(CODE) \
if( sqlite3_diskfull_pending ){ \
if( sqlite3_diskfull_pending == 1 ){ \
local_ioerr(); \
sqlite3_diskfull = 1; \
sqlite3_io_error_hit = 1; \
CODE; \
}else{ \
sqlite3_diskfull_pending--; \
} \
}
#else
#define SimulateIOErrorBenign(X)
#define SimulateIOError(A)
#define SimulateDiskfullError(A)
#endif /* defined(SQLITE_TEST) */
/*
** When testing, keep a count of the number of open files.
*/
#if defined(SQLITE_TEST)
extern int sqlite3_open_file_count;
#define OpenCounter(X) sqlite3_open_file_count+=(X)
#else
#define OpenCounter(X)
#endif /* defined(SQLITE_TEST) */
#endif /* !defined(_OS_COMMON_H_) */
| 3,147 | 106 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/pager.shell.c | #include "third_party/sqlite3/pager.c"
| 39 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/complete.shell.c | #include "third_party/sqlite3/complete.c"
| 42 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/complete.c | /*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** An tokenizer for SQL
**
** This file contains C code that implements the sqlite3_complete() API.
** This code used to be part of the tokenizer.c source file. But by
** separating it out, the code will be automatically omitted from
** static links that do not use it.
*/
#include "third_party/sqlite3/sqliteInt.h"
#ifndef SQLITE_OMIT_COMPLETE
/*
** This is defined in tokenize.c. We just have to import the definition.
*/
#ifndef SQLITE_AMALGAMATION
#ifdef SQLITE_ASCII
#define IdChar(C) ((sqlite3CtypeMap[(unsigned char)C]&0x46)!=0)
#endif
#ifdef SQLITE_EBCDIC
extern const char sqlite3IsEbcdicIdChar[];
#define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40]))
#endif
#endif /* SQLITE_AMALGAMATION */
/*
** Token types used by the sqlite3_complete() routine. See the header
** comments on that procedure for additional information.
*/
#define tkSEMI 0
#define tkWS 1
#define tkOTHER 2
#ifndef SQLITE_OMIT_TRIGGER
#define tkEXPLAIN 3
#define tkCREATE 4
#define tkTEMP 5
#define tkTRIGGER 6
#define tkEND 7
#endif
/*
** Return TRUE if the given SQL string ends in a semicolon.
**
** Special handling is require for CREATE TRIGGER statements.
** Whenever the CREATE TRIGGER keywords are seen, the statement
** must end with ";END;".
**
** This implementation uses a state machine with 8 states:
**
** (0) INVALID We have not yet seen a non-whitespace character.
**
** (1) START At the beginning or end of an SQL statement. This routine
** returns 1 if it ends in the START state and 0 if it ends
** in any other state.
**
** (2) NORMAL We are in the middle of statement which ends with a single
** semicolon.
**
** (3) EXPLAIN The keyword EXPLAIN has been seen at the beginning of
** a statement.
**
** (4) CREATE The keyword CREATE has been seen at the beginning of a
** statement, possibly preceded by EXPLAIN and/or followed by
** TEMP or TEMPORARY
**
** (5) TRIGGER We are in the middle of a trigger definition that must be
** ended by a semicolon, the keyword END, and another semicolon.
**
** (6) SEMI We've seen the first semicolon in the ";END;" that occurs at
** the end of a trigger definition.
**
** (7) END We've seen the ";END" of the ";END;" that occurs at the end
** of a trigger definition.
**
** Transitions between states above are determined by tokens extracted
** from the input. The following tokens are significant:
**
** (0) tkSEMI A semicolon.
** (1) tkWS Whitespace.
** (2) tkOTHER Any other SQL token.
** (3) tkEXPLAIN The "explain" keyword.
** (4) tkCREATE The "create" keyword.
** (5) tkTEMP The "temp" or "temporary" keyword.
** (6) tkTRIGGER The "trigger" keyword.
** (7) tkEND The "end" keyword.
**
** Whitespace never causes a state transition and is always ignored.
** This means that a SQL string of all whitespace is invalid.
**
** If we compile with SQLITE_OMIT_TRIGGER, all of the computation needed
** to recognize the end of a trigger can be omitted. All we have to do
** is look for a semicolon that is not part of an string or comment.
*/
int sqlite3_complete(const char *zSql){
u8 state = 0; /* Current state, using numbers defined in header comment */
u8 token; /* Value of the next token */
#ifndef SQLITE_OMIT_TRIGGER
/* A complex statement machine used to detect the end of a CREATE TRIGGER
** statement. This is the normal case.
*/
static const u8 trans[8][8] = {
/* Token: */
/* State: ** SEMI WS OTHER EXPLAIN CREATE TEMP TRIGGER END */
/* 0 INVALID: */ { 1, 0, 2, 3, 4, 2, 2, 2, },
/* 1 START: */ { 1, 1, 2, 3, 4, 2, 2, 2, },
/* 2 NORMAL: */ { 1, 2, 2, 2, 2, 2, 2, 2, },
/* 3 EXPLAIN: */ { 1, 3, 3, 2, 4, 2, 2, 2, },
/* 4 CREATE: */ { 1, 4, 2, 2, 2, 4, 5, 2, },
/* 5 TRIGGER: */ { 6, 5, 5, 5, 5, 5, 5, 5, },
/* 6 SEMI: */ { 6, 6, 5, 5, 5, 5, 5, 7, },
/* 7 END: */ { 1, 7, 5, 5, 5, 5, 5, 5, },
};
#else
/* If triggers are not supported by this compile then the statement machine
** used to detect the end of a statement is much simpler
*/
static const u8 trans[3][3] = {
/* Token: */
/* State: ** SEMI WS OTHER */
/* 0 INVALID: */ { 1, 0, 2, },
/* 1 START: */ { 1, 1, 2, },
/* 2 NORMAL: */ { 1, 2, 2, },
};
#endif /* SQLITE_OMIT_TRIGGER */
#ifdef SQLITE_ENABLE_API_ARMOR
if( zSql==0 ){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
while( *zSql ){
switch( *zSql ){
case ';': { /* A semicolon */
token = tkSEMI;
break;
}
case ' ':
case '\r':
case '\t':
case '\n':
case '\f': { /* White space is ignored */
token = tkWS;
break;
}
case '/': { /* C-style comments */
if( zSql[1]!='*' ){
token = tkOTHER;
break;
}
zSql += 2;
while( zSql[0] && (zSql[0]!='*' || zSql[1]!='/') ){ zSql++; }
if( zSql[0]==0 ) return 0;
zSql++;
token = tkWS;
break;
}
case '-': { /* SQL-style comments from "--" to end of line */
if( zSql[1]!='-' ){
token = tkOTHER;
break;
}
while( *zSql && *zSql!='\n' ){ zSql++; }
if( *zSql==0 ) return state==1;
token = tkWS;
break;
}
case '[': { /* Microsoft-style identifiers in [...] */
zSql++;
while( *zSql && *zSql!=']' ){ zSql++; }
if( *zSql==0 ) return 0;
token = tkOTHER;
break;
}
case '`': /* Grave-accent quoted symbols used by MySQL */
case '"': /* single- and double-quoted strings */
case '\'': {
int c = *zSql;
zSql++;
while( *zSql && *zSql!=c ){ zSql++; }
if( *zSql==0 ) return 0;
token = tkOTHER;
break;
}
default: {
#ifdef SQLITE_EBCDIC
unsigned char c;
#endif
if( IdChar((u8)*zSql) ){
/* Keywords and unquoted identifiers */
int nId;
for(nId=1; IdChar(zSql[nId]); nId++){}
#ifdef SQLITE_OMIT_TRIGGER
token = tkOTHER;
#else
switch( *zSql ){
case 'c': case 'C': {
if( nId==6 && sqlite3StrNICmp(zSql, "create", 6)==0 ){
token = tkCREATE;
}else{
token = tkOTHER;
}
break;
}
case 't': case 'T': {
if( nId==7 && sqlite3StrNICmp(zSql, "trigger", 7)==0 ){
token = tkTRIGGER;
}else if( nId==4 && sqlite3StrNICmp(zSql, "temp", 4)==0 ){
token = tkTEMP;
}else if( nId==9 && sqlite3StrNICmp(zSql, "temporary", 9)==0 ){
token = tkTEMP;
}else{
token = tkOTHER;
}
break;
}
case 'e': case 'E': {
if( nId==3 && sqlite3StrNICmp(zSql, "end", 3)==0 ){
token = tkEND;
}else
#ifndef SQLITE_OMIT_EXPLAIN
if( nId==7 && sqlite3StrNICmp(zSql, "explain", 7)==0 ){
token = tkEXPLAIN;
}else
#endif
{
token = tkOTHER;
}
break;
}
default: {
token = tkOTHER;
break;
}
}
#endif /* SQLITE_OMIT_TRIGGER */
zSql += nId-1;
}else{
/* Operators and special symbols */
token = tkOTHER;
}
break;
}
}
state = trans[state][token];
zSql++;
}
return state==1;
}
#ifndef SQLITE_OMIT_UTF16
/*
** This routine is the same as the sqlite3_complete() routine described
** above, except that the parameter is required to be UTF-16 encoded, not
** UTF-8.
*/
int sqlite3_complete16(const void *zSql){
sqlite3_value *pVal;
char const *zSql8;
int rc;
#ifndef SQLITE_OMIT_AUTOINIT
rc = sqlite3_initialize();
if( rc ) return rc;
#endif
pVal = sqlite3ValueNew(0);
sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
if( zSql8 ){
rc = sqlite3_complete(zSql8);
}else{
rc = SQLITE_NOMEM_BKPT;
}
sqlite3ValueFree(pVal);
return rc & 0xff;
}
#endif /* SQLITE_OMIT_UTF16 */
#endif /* SQLITE_OMIT_COMPLETE */
| 9,249 | 291 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/delete.c | /*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** in order to generate code for DELETE FROM statements.
*/
#include "third_party/sqlite3/sqliteInt.h"
/*
** While a SrcList can in general represent multiple tables and subqueries
** (as in the FROM clause of a SELECT statement) in this case it contains
** the name of a single table, as one might find in an INSERT, DELETE,
** or UPDATE statement. Look up that table in the symbol table and
** return a pointer. Set an error message and return NULL if the table
** name is not found or if any other error occurs.
**
** The following fields are initialized appropriate in pSrc:
**
** pSrc->a[0].pTab Pointer to the Table object
** pSrc->a[0].pIndex Pointer to the INDEXED BY index, if there is one
**
*/
Table *sqlite3SrcListLookup(Parse *pParse, SrcList *pSrc){
SrcItem *pItem = pSrc->a;
Table *pTab;
assert( pItem && pSrc->nSrc>=1 );
pTab = sqlite3LocateTableItem(pParse, 0, pItem);
sqlite3DeleteTable(pParse->db, pItem->pTab);
pItem->pTab = pTab;
if( pTab ){
pTab->nTabRef++;
if( pItem->fg.isIndexedBy && sqlite3IndexedByLookup(pParse, pItem) ){
pTab = 0;
}
}
return pTab;
}
/* Generate byte-code that will report the number of rows modified
** by a DELETE, INSERT, or UPDATE statement.
*/
void sqlite3CodeChangeCount(Vdbe *v, int regCounter, const char *zColName){
sqlite3VdbeAddOp0(v, OP_FkCheck);
sqlite3VdbeAddOp2(v, OP_ResultRow, regCounter, 1);
sqlite3VdbeSetNumCols(v, 1);
sqlite3VdbeSetColName(v, 0, COLNAME_NAME, zColName, SQLITE_STATIC);
}
/* Return true if table pTab is read-only.
**
** A table is read-only if any of the following are true:
**
** 1) It is a virtual table and no implementation of the xUpdate method
** has been provided
**
** 2) A trigger is currently being coded and the table is a virtual table
** that is SQLITE_VTAB_DIRECTONLY or if PRAGMA trusted_schema=OFF and
** the table is not SQLITE_VTAB_INNOCUOUS.
**
** 3) It is a system table (i.e. sqlite_schema), this call is not
** part of a nested parse and writable_schema pragma has not
** been specified
**
** 4) The table is a shadow table, the database connection is in
** defensive mode, and the current sqlite3_prepare()
** is for a top-level SQL statement.
*/
static int vtabIsReadOnly(Parse *pParse, Table *pTab){
if( sqlite3GetVTable(pParse->db, pTab)->pMod->pModule->xUpdate==0 ){
return 1;
}
/* Within triggers:
** * Do not allow DELETE, INSERT, or UPDATE of SQLITE_VTAB_DIRECTONLY
** virtual tables
** * Only allow DELETE, INSERT, or UPDATE of non-SQLITE_VTAB_INNOCUOUS
** virtual tables if PRAGMA trusted_schema=ON.
*/
if( pParse->pToplevel!=0
&& pTab->u.vtab.p->eVtabRisk >
((pParse->db->flags & SQLITE_TrustedSchema)!=0)
){
sqlite3ErrorMsg(pParse, "unsafe use of virtual table \"%s\"",
pTab->zName);
}
return 0;
}
static int tabIsReadOnly(Parse *pParse, Table *pTab){
sqlite3 *db;
if( IsVirtual(pTab) ){
return vtabIsReadOnly(pParse, pTab);
}
if( (pTab->tabFlags & (TF_Readonly|TF_Shadow))==0 ) return 0;
db = pParse->db;
if( (pTab->tabFlags & TF_Readonly)!=0 ){
return sqlite3WritableSchema(db)==0 && pParse->nested==0;
}
assert( pTab->tabFlags & TF_Shadow );
return sqlite3ReadOnlyShadowTables(db);
}
/*
** Check to make sure the given table is writable.
**
** If pTab is not writable -> generate an error message and return 1.
** If pTab is writable but other errors have occurred -> return 1.
** If pTab is writable and no prior errors -> return 0;
*/
int sqlite3IsReadOnly(Parse *pParse, Table *pTab, int viewOk){
if( tabIsReadOnly(pParse, pTab) ){
sqlite3ErrorMsg(pParse, "table %s may not be modified", pTab->zName);
return 1;
}
#ifndef SQLITE_OMIT_VIEW
if( !viewOk && IsView(pTab) ){
sqlite3ErrorMsg(pParse,"cannot modify %s because it is a view",pTab->zName);
return 1;
}
#endif
return 0;
}
#if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
/*
** Evaluate a view and store its result in an ephemeral table. The
** pWhere argument is an optional WHERE clause that restricts the
** set of rows in the view that are to be added to the ephemeral table.
*/
void sqlite3MaterializeView(
Parse *pParse, /* Parsing context */
Table *pView, /* View definition */
Expr *pWhere, /* Optional WHERE clause to be added */
ExprList *pOrderBy, /* Optional ORDER BY clause */
Expr *pLimit, /* Optional LIMIT clause */
int iCur /* Cursor number for ephemeral table */
){
SelectDest dest;
Select *pSel;
SrcList *pFrom;
sqlite3 *db = pParse->db;
int iDb = sqlite3SchemaToIndex(db, pView->pSchema);
pWhere = sqlite3ExprDup(db, pWhere, 0);
pFrom = sqlite3SrcListAppend(pParse, 0, 0, 0);
if( pFrom ){
assert( pFrom->nSrc==1 );
pFrom->a[0].zName = sqlite3DbStrDup(db, pView->zName);
pFrom->a[0].zDatabase = sqlite3DbStrDup(db, db->aDb[iDb].zDbSName);
assert( pFrom->a[0].fg.isUsing==0 );
assert( pFrom->a[0].u3.pOn==0 );
}
pSel = sqlite3SelectNew(pParse, 0, pFrom, pWhere, 0, 0, pOrderBy,
SF_IncludeHidden, pLimit);
sqlite3SelectDestInit(&dest, SRT_EphemTab, iCur);
sqlite3Select(pParse, pSel, &dest);
sqlite3SelectDelete(db, pSel);
}
#endif /* !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER) */
#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
/*
** Generate an expression tree to implement the WHERE, ORDER BY,
** and LIMIT/OFFSET portion of DELETE and UPDATE statements.
**
** DELETE FROM table_wxyz WHERE a<5 ORDER BY a LIMIT 1;
** \__________________________/
** pLimitWhere (pInClause)
*/
Expr *sqlite3LimitWhere(
Parse *pParse, /* The parser context */
SrcList *pSrc, /* the FROM clause -- which tables to scan */
Expr *pWhere, /* The WHERE clause. May be null */
ExprList *pOrderBy, /* The ORDER BY clause. May be null */
Expr *pLimit, /* The LIMIT clause. May be null */
char *zStmtType /* Either DELETE or UPDATE. For err msgs. */
){
sqlite3 *db = pParse->db;
Expr *pLhs = NULL; /* LHS of IN(SELECT...) operator */
Expr *pInClause = NULL; /* WHERE rowid IN ( select ) */
ExprList *pEList = NULL; /* Expression list contaning only pSelectRowid */
SrcList *pSelectSrc = NULL; /* SELECT rowid FROM x ... (dup of pSrc) */
Select *pSelect = NULL; /* Complete SELECT tree */
Table *pTab;
/* Check that there isn't an ORDER BY without a LIMIT clause.
*/
if( pOrderBy && pLimit==0 ) {
sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on %s", zStmtType);
sqlite3ExprDelete(pParse->db, pWhere);
sqlite3ExprListDelete(pParse->db, pOrderBy);
return 0;
}
/* We only need to generate a select expression if there
** is a limit/offset term to enforce.
*/
if( pLimit == 0 ) {
return pWhere;
}
/* Generate a select expression tree to enforce the limit/offset
** term for the DELETE or UPDATE statement. For example:
** DELETE FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
** becomes:
** DELETE FROM table_a WHERE rowid IN (
** SELECT rowid FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
** );
*/
pTab = pSrc->a[0].pTab;
if( HasRowid(pTab) ){
pLhs = sqlite3PExpr(pParse, TK_ROW, 0, 0);
pEList = sqlite3ExprListAppend(
pParse, 0, sqlite3PExpr(pParse, TK_ROW, 0, 0)
);
}else{
Index *pPk = sqlite3PrimaryKeyIndex(pTab);
if( pPk->nKeyCol==1 ){
const char *zName = pTab->aCol[pPk->aiColumn[0]].zCnName;
pLhs = sqlite3Expr(db, TK_ID, zName);
pEList = sqlite3ExprListAppend(pParse, 0, sqlite3Expr(db, TK_ID, zName));
}else{
int i;
for(i=0; i<pPk->nKeyCol; i++){
Expr *p = sqlite3Expr(db, TK_ID, pTab->aCol[pPk->aiColumn[i]].zCnName);
pEList = sqlite3ExprListAppend(pParse, pEList, p);
}
pLhs = sqlite3PExpr(pParse, TK_VECTOR, 0, 0);
if( pLhs ){
pLhs->x.pList = sqlite3ExprListDup(db, pEList, 0);
}
}
}
/* duplicate the FROM clause as it is needed by both the DELETE/UPDATE tree
** and the SELECT subtree. */
pSrc->a[0].pTab = 0;
pSelectSrc = sqlite3SrcListDup(db, pSrc, 0);
pSrc->a[0].pTab = pTab;
if( pSrc->a[0].fg.isIndexedBy ){
assert( pSrc->a[0].fg.isCte==0 );
pSrc->a[0].u2.pIBIndex = 0;
pSrc->a[0].fg.isIndexedBy = 0;
sqlite3DbFree(db, pSrc->a[0].u1.zIndexedBy);
}else if( pSrc->a[0].fg.isCte ){
pSrc->a[0].u2.pCteUse->nUse++;
}
/* generate the SELECT expression tree. */
pSelect = sqlite3SelectNew(pParse, pEList, pSelectSrc, pWhere, 0 ,0,
pOrderBy,0,pLimit
);
/* now generate the new WHERE rowid IN clause for the DELETE/UDPATE */
pInClause = sqlite3PExpr(pParse, TK_IN, pLhs, 0);
sqlite3PExprAddSelect(pParse, pInClause, pSelect);
return pInClause;
}
#endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) */
/* && !defined(SQLITE_OMIT_SUBQUERY) */
/*
** Generate code for a DELETE FROM statement.
**
** DELETE FROM table_wxyz WHERE a<5 AND b NOT NULL;
** \________/ \________________/
** pTabList pWhere
*/
void sqlite3DeleteFrom(
Parse *pParse, /* The parser context */
SrcList *pTabList, /* The table from which we should delete things */
Expr *pWhere, /* The WHERE clause. May be null */
ExprList *pOrderBy, /* ORDER BY clause. May be null */
Expr *pLimit /* LIMIT clause. May be null */
){
Vdbe *v; /* The virtual database engine */
Table *pTab; /* The table from which records will be deleted */
int i; /* Loop counter */
WhereInfo *pWInfo; /* Information about the WHERE clause */
Index *pIdx; /* For looping over indices of the table */
int iTabCur; /* Cursor number for the table */
int iDataCur = 0; /* VDBE cursor for the canonical data source */
int iIdxCur = 0; /* Cursor number of the first index */
int nIdx; /* Number of indices */
sqlite3 *db; /* Main database structure */
AuthContext sContext; /* Authorization context */
NameContext sNC; /* Name context to resolve expressions in */
int iDb; /* Database number */
int memCnt = 0; /* Memory cell used for change counting */
int rcauth; /* Value returned by authorization callback */
int eOnePass; /* ONEPASS_OFF or _SINGLE or _MULTI */
int aiCurOnePass[2]; /* The write cursors opened by WHERE_ONEPASS */
u8 *aToOpen = 0; /* Open cursor iTabCur+j if aToOpen[j] is true */
Index *pPk; /* The PRIMARY KEY index on the table */
int iPk = 0; /* First of nPk registers holding PRIMARY KEY value */
i16 nPk = 1; /* Number of columns in the PRIMARY KEY */
int iKey; /* Memory cell holding key of row to be deleted */
i16 nKey; /* Number of memory cells in the row key */
int iEphCur = 0; /* Ephemeral table holding all primary key values */
int iRowSet = 0; /* Register for rowset of rows to delete */
int addrBypass = 0; /* Address of jump over the delete logic */
int addrLoop = 0; /* Top of the delete loop */
int addrEphOpen = 0; /* Instruction to open the Ephemeral table */
int bComplex; /* True if there are triggers or FKs or
** subqueries in the WHERE clause */
#ifndef SQLITE_OMIT_TRIGGER
int isView; /* True if attempting to delete from a view */
Trigger *pTrigger; /* List of table triggers, if required */
#endif
memset(&sContext, 0, sizeof(sContext));
db = pParse->db;
assert( db->pParse==pParse );
if( pParse->nErr ){
goto delete_from_cleanup;
}
assert( db->mallocFailed==0 );
assert( pTabList->nSrc==1 );
/* Locate the table which we want to delete. This table has to be
** put in an SrcList structure because some of the subroutines we
** will be calling are designed to work with multiple tables and expect
** an SrcList* parameter instead of just a Table* parameter.
*/
pTab = sqlite3SrcListLookup(pParse, pTabList);
if( pTab==0 ) goto delete_from_cleanup;
/* Figure out if we have any triggers and if the table being
** deleted from is a view
*/
#ifndef SQLITE_OMIT_TRIGGER
pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
isView = IsView(pTab);
#else
# define pTrigger 0
# define isView 0
#endif
bComplex = pTrigger || sqlite3FkRequired(pParse, pTab, 0, 0);
#ifdef SQLITE_OMIT_VIEW
# undef isView
# define isView 0
#endif
#if TREETRACE_ENABLED
if( sqlite3TreeTrace & 0x10000 ){
sqlite3TreeViewLine(0, "In sqlite3Delete() at %s:%d", __FILE__, __LINE__);
sqlite3TreeViewDelete(pParse->pWith, pTabList, pWhere,
pOrderBy, pLimit, pTrigger);
}
#endif
#ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
if( !isView ){
pWhere = sqlite3LimitWhere(
pParse, pTabList, pWhere, pOrderBy, pLimit, "DELETE"
);
pOrderBy = 0;
pLimit = 0;
}
#endif
/* If pTab is really a view, make sure it has been initialized.
*/
if( sqlite3ViewGetColumnNames(pParse, pTab) ){
goto delete_from_cleanup;
}
if( sqlite3IsReadOnly(pParse, pTab, (pTrigger?1:0)) ){
goto delete_from_cleanup;
}
iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
assert( iDb<db->nDb );
rcauth = sqlite3AuthCheck(pParse, SQLITE_DELETE, pTab->zName, 0,
db->aDb[iDb].zDbSName);
assert( rcauth==SQLITE_OK || rcauth==SQLITE_DENY || rcauth==SQLITE_IGNORE );
if( rcauth==SQLITE_DENY ){
goto delete_from_cleanup;
}
assert(!isView || pTrigger);
/* Assign cursor numbers to the table and all its indices.
*/
assert( pTabList->nSrc==1 );
iTabCur = pTabList->a[0].iCursor = pParse->nTab++;
for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){
pParse->nTab++;
}
/* Start the view context
*/
if( isView ){
sqlite3AuthContextPush(pParse, &sContext, pTab->zName);
}
/* Begin generating code.
*/
v = sqlite3GetVdbe(pParse);
if( v==0 ){
goto delete_from_cleanup;
}
if( pParse->nested==0 ) sqlite3VdbeCountChanges(v);
sqlite3BeginWriteOperation(pParse, bComplex, iDb);
/* If we are trying to delete from a view, realize that view into
** an ephemeral table.
*/
#if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
if( isView ){
sqlite3MaterializeView(pParse, pTab,
pWhere, pOrderBy, pLimit, iTabCur
);
iDataCur = iIdxCur = iTabCur;
pOrderBy = 0;
pLimit = 0;
}
#endif
/* Resolve the column names in the WHERE clause.
*/
memset(&sNC, 0, sizeof(sNC));
sNC.pParse = pParse;
sNC.pSrcList = pTabList;
if( sqlite3ResolveExprNames(&sNC, pWhere) ){
goto delete_from_cleanup;
}
/* Initialize the counter of the number of rows deleted, if
** we are counting rows.
*/
if( (db->flags & SQLITE_CountRows)!=0
&& !pParse->nested
&& !pParse->pTriggerTab
&& !pParse->bReturning
){
memCnt = ++pParse->nMem;
sqlite3VdbeAddOp2(v, OP_Integer, 0, memCnt);
}
#ifndef SQLITE_OMIT_TRUNCATE_OPTIMIZATION
/* Special case: A DELETE without a WHERE clause deletes everything.
** It is easier just to erase the whole table. Prior to version 3.6.5,
** this optimization caused the row change count (the value returned by
** API function sqlite3_count_changes) to be set incorrectly.
**
** The "rcauth==SQLITE_OK" terms is the
** IMPLEMENTATION-OF: R-17228-37124 If the action code is SQLITE_DELETE and
** the callback returns SQLITE_IGNORE then the DELETE operation proceeds but
** the truncate optimization is disabled and all rows are deleted
** individually.
*/
if( rcauth==SQLITE_OK
&& pWhere==0
&& !bComplex
&& !IsVirtual(pTab)
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
&& db->xPreUpdateCallback==0
#endif
){
assert( !isView );
sqlite3TableLock(pParse, iDb, pTab->tnum, 1, pTab->zName);
if( HasRowid(pTab) ){
sqlite3VdbeAddOp4(v, OP_Clear, pTab->tnum, iDb, memCnt ? memCnt : -1,
pTab->zName, P4_STATIC);
}
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
assert( pIdx->pSchema==pTab->pSchema );
if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) ){
sqlite3VdbeAddOp3(v, OP_Clear, pIdx->tnum, iDb, memCnt ? memCnt : -1);
}else{
sqlite3VdbeAddOp2(v, OP_Clear, pIdx->tnum, iDb);
}
}
}else
#endif /* SQLITE_OMIT_TRUNCATE_OPTIMIZATION */
{
u16 wcf = WHERE_ONEPASS_DESIRED|WHERE_DUPLICATES_OK;
if( sNC.ncFlags & NC_VarSelect ) bComplex = 1;
wcf |= (bComplex ? 0 : WHERE_ONEPASS_MULTIROW);
if( HasRowid(pTab) ){
/* For a rowid table, initialize the RowSet to an empty set */
pPk = 0;
nPk = 1;
iRowSet = ++pParse->nMem;
sqlite3VdbeAddOp2(v, OP_Null, 0, iRowSet);
}else{
/* For a WITHOUT ROWID table, create an ephemeral table used to
** hold all primary keys for rows to be deleted. */
pPk = sqlite3PrimaryKeyIndex(pTab);
assert( pPk!=0 );
nPk = pPk->nKeyCol;
iPk = pParse->nMem+1;
pParse->nMem += nPk;
iEphCur = pParse->nTab++;
addrEphOpen = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, iEphCur, nPk);
sqlite3VdbeSetP4KeyInfo(pParse, pPk);
}
/* Construct a query to find the rowid or primary key for every row
** to be deleted, based on the WHERE clause. Set variable eOnePass
** to indicate the strategy used to implement this delete:
**
** ONEPASS_OFF: Two-pass approach - use a FIFO for rowids/PK values.
** ONEPASS_SINGLE: One-pass approach - at most one row deleted.
** ONEPASS_MULTI: One-pass approach - any number of rows may be deleted.
*/
pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0, 0,0,wcf,iTabCur+1);
if( pWInfo==0 ) goto delete_from_cleanup;
eOnePass = sqlite3WhereOkOnePass(pWInfo, aiCurOnePass);
assert( IsVirtual(pTab)==0 || eOnePass!=ONEPASS_MULTI );
assert( IsVirtual(pTab) || bComplex || eOnePass!=ONEPASS_OFF );
if( eOnePass!=ONEPASS_SINGLE ) sqlite3MultiWrite(pParse);
if( sqlite3WhereUsesDeferredSeek(pWInfo) ){
sqlite3VdbeAddOp1(v, OP_FinishSeek, iTabCur);
}
/* Keep track of the number of rows to be deleted */
if( memCnt ){
sqlite3VdbeAddOp2(v, OP_AddImm, memCnt, 1);
}
/* Extract the rowid or primary key for the current row */
if( pPk ){
for(i=0; i<nPk; i++){
assert( pPk->aiColumn[i]>=0 );
sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur,
pPk->aiColumn[i], iPk+i);
}
iKey = iPk;
}else{
iKey = ++pParse->nMem;
sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, -1, iKey);
}
if( eOnePass!=ONEPASS_OFF ){
/* For ONEPASS, no need to store the rowid/primary-key. There is only
** one, so just keep it in its register(s) and fall through to the
** delete code. */
nKey = nPk; /* OP_Found will use an unpacked key */
aToOpen = sqlite3DbMallocRawNN(db, nIdx+2);
if( aToOpen==0 ){
sqlite3WhereEnd(pWInfo);
goto delete_from_cleanup;
}
memset(aToOpen, 1, nIdx+1);
aToOpen[nIdx+1] = 0;
if( aiCurOnePass[0]>=0 ) aToOpen[aiCurOnePass[0]-iTabCur] = 0;
if( aiCurOnePass[1]>=0 ) aToOpen[aiCurOnePass[1]-iTabCur] = 0;
if( addrEphOpen ) sqlite3VdbeChangeToNoop(v, addrEphOpen);
addrBypass = sqlite3VdbeMakeLabel(pParse);
}else{
if( pPk ){
/* Add the PK key for this row to the temporary table */
iKey = ++pParse->nMem;
nKey = 0; /* Zero tells OP_Found to use a composite key */
sqlite3VdbeAddOp4(v, OP_MakeRecord, iPk, nPk, iKey,
sqlite3IndexAffinityStr(pParse->db, pPk), nPk);
sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iEphCur, iKey, iPk, nPk);
}else{
/* Add the rowid of the row to be deleted to the RowSet */
nKey = 1; /* OP_DeferredSeek always uses a single rowid */
sqlite3VdbeAddOp2(v, OP_RowSetAdd, iRowSet, iKey);
}
sqlite3WhereEnd(pWInfo);
}
/* Unless this is a view, open cursors for the table we are
** deleting from and all its indices. If this is a view, then the
** only effect this statement has is to fire the INSTEAD OF
** triggers.
*/
if( !isView ){
int iAddrOnce = 0;
if( eOnePass==ONEPASS_MULTI ){
iAddrOnce = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
}
testcase( IsVirtual(pTab) );
sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, OPFLAG_FORDELETE,
iTabCur, aToOpen, &iDataCur, &iIdxCur);
assert( pPk || IsVirtual(pTab) || iDataCur==iTabCur );
assert( pPk || IsVirtual(pTab) || iIdxCur==iDataCur+1 );
if( eOnePass==ONEPASS_MULTI ){
sqlite3VdbeJumpHereOrPopInst(v, iAddrOnce);
}
}
/* Set up a loop over the rowids/primary-keys that were found in the
** where-clause loop above.
*/
if( eOnePass!=ONEPASS_OFF ){
assert( nKey==nPk ); /* OP_Found will use an unpacked key */
if( !IsVirtual(pTab) && aToOpen[iDataCur-iTabCur] ){
assert( pPk!=0 || IsView(pTab) );
sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, addrBypass, iKey, nKey);
VdbeCoverage(v);
}
}else if( pPk ){
addrLoop = sqlite3VdbeAddOp1(v, OP_Rewind, iEphCur); VdbeCoverage(v);
if( IsVirtual(pTab) ){
sqlite3VdbeAddOp3(v, OP_Column, iEphCur, 0, iKey);
}else{
sqlite3VdbeAddOp2(v, OP_RowData, iEphCur, iKey);
}
assert( nKey==0 ); /* OP_Found will use a composite key */
}else{
addrLoop = sqlite3VdbeAddOp3(v, OP_RowSetRead, iRowSet, 0, iKey);
VdbeCoverage(v);
assert( nKey==1 );
}
/* Delete the row */
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( IsVirtual(pTab) ){
const char *pVTab = (const char *)sqlite3GetVTable(db, pTab);
sqlite3VtabMakeWritable(pParse, pTab);
assert( eOnePass==ONEPASS_OFF || eOnePass==ONEPASS_SINGLE );
sqlite3MayAbort(pParse);
if( eOnePass==ONEPASS_SINGLE ){
sqlite3VdbeAddOp1(v, OP_Close, iTabCur);
if( sqlite3IsToplevel(pParse) ){
pParse->isMultiWrite = 0;
}
}
sqlite3VdbeAddOp4(v, OP_VUpdate, 0, 1, iKey, pVTab, P4_VTAB);
sqlite3VdbeChangeP5(v, OE_Abort);
}else
#endif
{
int count = (pParse->nested==0); /* True to count changes */
sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
iKey, nKey, count, OE_Default, eOnePass, aiCurOnePass[1]);
}
/* End of the loop over all rowids/primary-keys. */
if( eOnePass!=ONEPASS_OFF ){
sqlite3VdbeResolveLabel(v, addrBypass);
sqlite3WhereEnd(pWInfo);
}else if( pPk ){
sqlite3VdbeAddOp2(v, OP_Next, iEphCur, addrLoop+1); VdbeCoverage(v);
sqlite3VdbeJumpHere(v, addrLoop);
}else{
sqlite3VdbeGoto(v, addrLoop);
sqlite3VdbeJumpHere(v, addrLoop);
}
} /* End non-truncate path */
/* Update the sqlite_sequence table by storing the content of the
** maximum rowid counter values recorded while inserting into
** autoincrement tables.
*/
if( pParse->nested==0 && pParse->pTriggerTab==0 ){
sqlite3AutoincrementEnd(pParse);
}
/* Return the number of rows that were deleted. If this routine is
** generating code because of a call to sqlite3NestedParse(), do not
** invoke the callback function.
*/
if( memCnt ){
sqlite3CodeChangeCount(v, memCnt, "rows deleted");
}
delete_from_cleanup:
sqlite3AuthContextPop(&sContext);
sqlite3SrcListDelete(db, pTabList);
sqlite3ExprDelete(db, pWhere);
#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT)
sqlite3ExprListDelete(db, pOrderBy);
sqlite3ExprDelete(db, pLimit);
#endif
if( aToOpen ) sqlite3DbNNFreeNN(db, aToOpen);
return;
}
/* Make sure "isView" and other macros defined above are undefined. Otherwise
** they may interfere with compilation of other functions in this file
** (or in another file, if this file becomes part of the amalgamation). */
#ifdef isView
#undef isView
#endif
#ifdef pTrigger
#undef pTrigger
#endif
/*
** This routine generates VDBE code that causes a single row of a
** single table to be deleted. Both the original table entry and
** all indices are removed.
**
** Preconditions:
**
** 1. iDataCur is an open cursor on the btree that is the canonical data
** store for the table. (This will be either the table itself,
** in the case of a rowid table, or the PRIMARY KEY index in the case
** of a WITHOUT ROWID table.)
**
** 2. Read/write cursors for all indices of pTab must be open as
** cursor number iIdxCur+i for the i-th index.
**
** 3. The primary key for the row to be deleted must be stored in a
** sequence of nPk memory cells starting at iPk. If nPk==0 that means
** that a search record formed from OP_MakeRecord is contained in the
** single memory location iPk.
**
** eMode:
** Parameter eMode may be passed either ONEPASS_OFF (0), ONEPASS_SINGLE, or
** ONEPASS_MULTI. If eMode is not ONEPASS_OFF, then the cursor
** iDataCur already points to the row to delete. If eMode is ONEPASS_OFF
** then this function must seek iDataCur to the entry identified by iPk
** and nPk before reading from it.
**
** If eMode is ONEPASS_MULTI, then this call is being made as part
** of a ONEPASS delete that affects multiple rows. In this case, if
** iIdxNoSeek is a valid cursor number (>=0) and is not the same as
** iDataCur, then its position should be preserved following the delete
** operation. Or, if iIdxNoSeek is not a valid cursor number, the
** position of iDataCur should be preserved instead.
**
** iIdxNoSeek:
** If iIdxNoSeek is a valid cursor number (>=0) not equal to iDataCur,
** then it identifies an index cursor (from within array of cursors
** starting at iIdxCur) that already points to the index entry to be deleted.
** Except, this optimization is disabled if there are BEFORE triggers since
** the trigger body might have moved the cursor.
*/
void sqlite3GenerateRowDelete(
Parse *pParse, /* Parsing context */
Table *pTab, /* Table containing the row to be deleted */
Trigger *pTrigger, /* List of triggers to (potentially) fire */
int iDataCur, /* Cursor from which column data is extracted */
int iIdxCur, /* First index cursor */
int iPk, /* First memory cell containing the PRIMARY KEY */
i16 nPk, /* Number of PRIMARY KEY memory cells */
u8 count, /* If non-zero, increment the row change counter */
u8 onconf, /* Default ON CONFLICT policy for triggers */
u8 eMode, /* ONEPASS_OFF, _SINGLE, or _MULTI. See above */
int iIdxNoSeek /* Cursor number of cursor that does not need seeking */
){
Vdbe *v = pParse->pVdbe; /* Vdbe */
int iOld = 0; /* First register in OLD.* array */
int iLabel; /* Label resolved to end of generated code */
u8 opSeek; /* Seek opcode */
/* Vdbe is guaranteed to have been allocated by this stage. */
assert( v );
VdbeModuleComment((v, "BEGIN: GenRowDel(%d,%d,%d,%d)",
iDataCur, iIdxCur, iPk, (int)nPk));
/* Seek cursor iCur to the row to delete. If this row no longer exists
** (this can happen if a trigger program has already deleted it), do
** not attempt to delete it or fire any DELETE triggers. */
iLabel = sqlite3VdbeMakeLabel(pParse);
opSeek = HasRowid(pTab) ? OP_NotExists : OP_NotFound;
if( eMode==ONEPASS_OFF ){
sqlite3VdbeAddOp4Int(v, opSeek, iDataCur, iLabel, iPk, nPk);
VdbeCoverageIf(v, opSeek==OP_NotExists);
VdbeCoverageIf(v, opSeek==OP_NotFound);
}
/* If there are any triggers to fire, allocate a range of registers to
** use for the old.* references in the triggers. */
if( sqlite3FkRequired(pParse, pTab, 0, 0) || pTrigger ){
u32 mask; /* Mask of OLD.* columns in use */
int iCol; /* Iterator used while populating OLD.* */
int addrStart; /* Start of BEFORE trigger programs */
/* TODO: Could use temporary registers here. Also could attempt to
** avoid copying the contents of the rowid register. */
mask = sqlite3TriggerColmask(
pParse, pTrigger, 0, 0, TRIGGER_BEFORE|TRIGGER_AFTER, pTab, onconf
);
mask |= sqlite3FkOldmask(pParse, pTab);
iOld = pParse->nMem+1;
pParse->nMem += (1 + pTab->nCol);
/* Populate the OLD.* pseudo-table register array. These values will be
** used by any BEFORE and AFTER triggers that exist. */
sqlite3VdbeAddOp2(v, OP_Copy, iPk, iOld);
for(iCol=0; iCol<pTab->nCol; iCol++){
testcase( mask!=0xffffffff && iCol==31 );
testcase( mask!=0xffffffff && iCol==32 );
if( mask==0xffffffff || (iCol<=31 && (mask & MASKBIT32(iCol))!=0) ){
int kk = sqlite3TableColumnToStorage(pTab, iCol);
sqlite3ExprCodeGetColumnOfTable(v, pTab, iDataCur, iCol, iOld+kk+1);
}
}
/* Invoke BEFORE DELETE trigger programs. */
addrStart = sqlite3VdbeCurrentAddr(v);
sqlite3CodeRowTrigger(pParse, pTrigger,
TK_DELETE, 0, TRIGGER_BEFORE, pTab, iOld, onconf, iLabel
);
/* If any BEFORE triggers were coded, then seek the cursor to the
** row to be deleted again. It may be that the BEFORE triggers moved
** the cursor or already deleted the row that the cursor was
** pointing to.
**
** Also disable the iIdxNoSeek optimization since the BEFORE trigger
** may have moved that cursor.
*/
if( addrStart<sqlite3VdbeCurrentAddr(v) ){
sqlite3VdbeAddOp4Int(v, opSeek, iDataCur, iLabel, iPk, nPk);
VdbeCoverageIf(v, opSeek==OP_NotExists);
VdbeCoverageIf(v, opSeek==OP_NotFound);
testcase( iIdxNoSeek>=0 );
iIdxNoSeek = -1;
}
/* Do FK processing. This call checks that any FK constraints that
** refer to this table (i.e. constraints attached to other tables)
** are not violated by deleting this row. */
sqlite3FkCheck(pParse, pTab, iOld, 0, 0, 0);
}
/* Delete the index and table entries. Skip this step if pTab is really
** a view (in which case the only effect of the DELETE statement is to
** fire the INSTEAD OF triggers).
**
** If variable 'count' is non-zero, then this OP_Delete instruction should
** invoke the update-hook. The pre-update-hook, on the other hand should
** be invoked unless table pTab is a system table. The difference is that
** the update-hook is not invoked for rows removed by REPLACE, but the
** pre-update-hook is.
*/
if( !IsView(pTab) ){
u8 p5 = 0;
sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur,0,iIdxNoSeek);
sqlite3VdbeAddOp2(v, OP_Delete, iDataCur, (count?OPFLAG_NCHANGE:0));
if( pParse->nested==0 || 0==sqlite3_stricmp(pTab->zName, "sqlite_stat1") ){
sqlite3VdbeAppendP4(v, (char*)pTab, P4_TABLE);
}
if( eMode!=ONEPASS_OFF ){
sqlite3VdbeChangeP5(v, OPFLAG_AUXDELETE);
}
if( iIdxNoSeek>=0 && iIdxNoSeek!=iDataCur ){
sqlite3VdbeAddOp1(v, OP_Delete, iIdxNoSeek);
}
if( eMode==ONEPASS_MULTI ) p5 |= OPFLAG_SAVEPOSITION;
sqlite3VdbeChangeP5(v, p5);
}
/* Do any ON CASCADE, SET NULL or SET DEFAULT operations required to
** handle rows (possibly in other tables) that refer via a foreign key
** to the row just deleted. */
sqlite3FkActions(pParse, pTab, 0, iOld, 0, 0);
/* Invoke AFTER DELETE trigger programs. */
sqlite3CodeRowTrigger(pParse, pTrigger,
TK_DELETE, 0, TRIGGER_AFTER, pTab, iOld, onconf, iLabel
);
/* Jump here if the row had already been deleted before any BEFORE
** trigger programs were invoked. Or if a trigger program throws a
** RAISE(IGNORE) exception. */
sqlite3VdbeResolveLabel(v, iLabel);
VdbeModuleComment((v, "END: GenRowDel()"));
}
/*
** This routine generates VDBE code that causes the deletion of all
** index entries associated with a single row of a single table, pTab
**
** Preconditions:
**
** 1. A read/write cursor "iDataCur" must be open on the canonical storage
** btree for the table pTab. (This will be either the table itself
** for rowid tables or to the primary key index for WITHOUT ROWID
** tables.)
**
** 2. Read/write cursors for all indices of pTab must be open as
** cursor number iIdxCur+i for the i-th index. (The pTab->pIndex
** index is the 0-th index.)
**
** 3. The "iDataCur" cursor must be already be positioned on the row
** that is to be deleted.
*/
void sqlite3GenerateRowIndexDelete(
Parse *pParse, /* Parsing and code generating context */
Table *pTab, /* Table containing the row to be deleted */
int iDataCur, /* Cursor of table holding data. */
int iIdxCur, /* First index cursor */
int *aRegIdx, /* Only delete if aRegIdx!=0 && aRegIdx[i]>0 */
int iIdxNoSeek /* Do not delete from this cursor */
){
int i; /* Index loop counter */
int r1 = -1; /* Register holding an index key */
int iPartIdxLabel; /* Jump destination for skipping partial index entries */
Index *pIdx; /* Current index */
Index *pPrior = 0; /* Prior index */
Vdbe *v; /* The prepared statement under construction */
Index *pPk; /* PRIMARY KEY index, or NULL for rowid tables */
v = pParse->pVdbe;
pPk = HasRowid(pTab) ? 0 : sqlite3PrimaryKeyIndex(pTab);
for(i=0, pIdx=pTab->pIndex; pIdx; i++, pIdx=pIdx->pNext){
assert( iIdxCur+i!=iDataCur || pPk==pIdx );
if( aRegIdx!=0 && aRegIdx[i]==0 ) continue;
if( pIdx==pPk ) continue;
if( iIdxCur+i==iIdxNoSeek ) continue;
VdbeModuleComment((v, "GenRowIdxDel for %s", pIdx->zName));
r1 = sqlite3GenerateIndexKey(pParse, pIdx, iDataCur, 0, 1,
&iPartIdxLabel, pPrior, r1);
sqlite3VdbeAddOp3(v, OP_IdxDelete, iIdxCur+i, r1,
pIdx->uniqNotNull ? pIdx->nKeyCol : pIdx->nColumn);
sqlite3VdbeChangeP5(v, 1); /* Cause IdxDelete to error if no entry found */
sqlite3ResolvePartIdxLabel(pParse, iPartIdxLabel);
pPrior = pIdx;
}
}
/*
** Generate code that will assemble an index key and stores it in register
** regOut. The key with be for index pIdx which is an index on pTab.
** iCur is the index of a cursor open on the pTab table and pointing to
** the entry that needs indexing. If pTab is a WITHOUT ROWID table, then
** iCur must be the cursor of the PRIMARY KEY index.
**
** Return a register number which is the first in a block of
** registers that holds the elements of the index key. The
** block of registers has already been deallocated by the time
** this routine returns.
**
** If *piPartIdxLabel is not NULL, fill it in with a label and jump
** to that label if pIdx is a partial index that should be skipped.
** The label should be resolved using sqlite3ResolvePartIdxLabel().
** A partial index should be skipped if its WHERE clause evaluates
** to false or null. If pIdx is not a partial index, *piPartIdxLabel
** will be set to zero which is an empty label that is ignored by
** sqlite3ResolvePartIdxLabel().
**
** The pPrior and regPrior parameters are used to implement a cache to
** avoid unnecessary register loads. If pPrior is not NULL, then it is
** a pointer to a different index for which an index key has just been
** computed into register regPrior. If the current pIdx index is generating
** its key into the same sequence of registers and if pPrior and pIdx share
** a column in common, then the register corresponding to that column already
** holds the correct value and the loading of that register is skipped.
** This optimization is helpful when doing a DELETE or an INTEGRITY_CHECK
** on a table with multiple indices, and especially with the ROWID or
** PRIMARY KEY columns of the index.
*/
int sqlite3GenerateIndexKey(
Parse *pParse, /* Parsing context */
Index *pIdx, /* The index for which to generate a key */
int iDataCur, /* Cursor number from which to take column data */
int regOut, /* Put the new key into this register if not 0 */
int prefixOnly, /* Compute only a unique prefix of the key */
int *piPartIdxLabel, /* OUT: Jump to this label to skip partial index */
Index *pPrior, /* Previously generated index key */
int regPrior /* Register holding previous generated key */
){
Vdbe *v = pParse->pVdbe;
int j;
int regBase;
int nCol;
if( piPartIdxLabel ){
if( pIdx->pPartIdxWhere ){
*piPartIdxLabel = sqlite3VdbeMakeLabel(pParse);
pParse->iSelfTab = iDataCur + 1;
sqlite3ExprIfFalseDup(pParse, pIdx->pPartIdxWhere, *piPartIdxLabel,
SQLITE_JUMPIFNULL);
pParse->iSelfTab = 0;
pPrior = 0; /* Ticket a9efb42811fa41ee 2019-11-02;
** pPartIdxWhere may have corrupted regPrior registers */
}else{
*piPartIdxLabel = 0;
}
}
nCol = (prefixOnly && pIdx->uniqNotNull) ? pIdx->nKeyCol : pIdx->nColumn;
regBase = sqlite3GetTempRange(pParse, nCol);
if( pPrior && (regBase!=regPrior || pPrior->pPartIdxWhere) ) pPrior = 0;
for(j=0; j<nCol; j++){
if( pPrior
&& pPrior->aiColumn[j]==pIdx->aiColumn[j]
&& pPrior->aiColumn[j]!=XN_EXPR
){
/* This column was already computed by the previous index */
continue;
}
sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iDataCur, j, regBase+j);
if( pIdx->aiColumn[j]>=0 ){
/* If the column affinity is REAL but the number is an integer, then it
** might be stored in the table as an integer (using a compact
** representation) then converted to REAL by an OP_RealAffinity opcode.
** But we are getting ready to store this value back into an index, where
** it should be converted by to INTEGER again. So omit the
** OP_RealAffinity opcode if it is present */
sqlite3VdbeDeletePriorOpcode(v, OP_RealAffinity);
}
}
if( regOut ){
sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase, nCol, regOut);
}
sqlite3ReleaseTempRange(pParse, regBase, nCol);
return regBase;
}
/*
** If a prior call to sqlite3GenerateIndexKey() generated a jump-over label
** because it was a partial index, then this routine should be called to
** resolve that label.
*/
void sqlite3ResolvePartIdxLabel(Parse *pParse, int iLabel){
if( iLabel ){
sqlite3VdbeResolveLabel(pParse->pVdbe, iLabel);
}
}
| 39,284 | 1,017 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/notify.shell.c | #include "third_party/sqlite3/notify.c"
| 40 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/build.shell.c | #include "third_party/sqlite3/build.c"
| 39 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/resolve.shell.c | #include "third_party/sqlite3/resolve.c"
| 41 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/icu.c | /*
** 2007 May 6
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: icu.c,v 1.7 2007/12/13 21:54:11 drh Exp $
**
** This file implements an integration between the ICU library
** ("International Components for Unicode", an open-source library
** for handling unicode data) and SQLite. The integration uses
** ICU to provide the following to SQLite:
**
** * An implementation of the SQL regexp() function (and hence REGEXP
** operator) using the ICU uregex_XX() APIs.
**
** * Implementations of the SQL scalar upper() and lower() functions
** for case mapping.
**
** * Integration of ICU and SQLite collation sequences.
**
** * An implementation of the LIKE operator that uses ICU to
** provide case-independent matching.
*/
#if !defined(SQLITE_CORE) \
|| defined(SQLITE_ENABLE_ICU) \
|| defined(SQLITE_ENABLE_ICU_COLLATIONS)
/* Include ICU headers */
#include "libc/assert.h"
#include "libc/str/unicode.h"
#ifndef SQLITE_CORE
#include "third_party/sqlite3/sqlite3ext.h"
SQLITE_EXTENSION_INIT1
#else
#include "third_party/sqlite3/sqlite3.h"
#endif
/*
** This function is called when an ICU function called from within
** the implementation of an SQL scalar function returns an error.
**
** The scalar function context passed as the first argument is
** loaded with an error message based on the following two args.
*/
static void icuFunctionError(
sqlite3_context *pCtx, /* SQLite scalar function context */
const char *zName, /* Name of ICU function that failed */
UErrorCode e /* Error code returned by ICU function */
){
char zBuf[128];
sqlite3_snprintf(128, zBuf, "ICU error: %s(): %s", zName, u_errorName(e));
zBuf[127] = '\0';
sqlite3_result_error(pCtx, zBuf, -1);
}
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU)
/*
** Maximum length (in bytes) of the pattern in a LIKE or GLOB
** operator.
*/
#ifndef SQLITE_MAX_LIKE_PATTERN_LENGTH
# define SQLITE_MAX_LIKE_PATTERN_LENGTH 50000
#endif
/*
** Version of sqlite3_free() that is always a function, never a macro.
*/
static void xFree(void *p){
sqlite3_free(p);
}
/*
** This lookup table is used to help decode the first byte of
** a multi-byte UTF8 character. It is copied here from SQLite source
** code file utf8.c.
*/
static const unsigned char icuUtf8Trans1[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
};
#define SQLITE_ICU_READ_UTF8(zIn, c) \
c = *(zIn++); \
if( c>=0xc0 ){ \
c = icuUtf8Trans1[c-0xc0]; \
while( (*zIn & 0xc0)==0x80 ){ \
c = (c<<6) + (0x3f & *(zIn++)); \
} \
}
#define SQLITE_ICU_SKIP_UTF8(zIn) \
assert( *zIn ); \
if( *(zIn++)>=0xc0 ){ \
while( (*zIn & 0xc0)==0x80 ){zIn++;} \
}
/*
** Compare two UTF-8 strings for equality where the first string is
** a "LIKE" expression. Return true (1) if they are the same and
** false (0) if they are different.
*/
static int icuLikeCompare(
const uint8_t *zPattern, /* LIKE pattern */
const uint8_t *zString, /* The UTF-8 string to compare against */
const UChar32 uEsc /* The escape character */
){
static const uint32_t MATCH_ONE = (uint32_t)'_';
static const uint32_t MATCH_ALL = (uint32_t)'%';
int prevEscape = 0; /* True if the previous character was uEsc */
while( 1 ){
/* Read (and consume) the next character from the input pattern. */
uint32_t uPattern;
SQLITE_ICU_READ_UTF8(zPattern, uPattern);
if( uPattern==0 ) break;
/* There are now 4 possibilities:
**
** 1. uPattern is an unescaped match-all character "%",
** 2. uPattern is an unescaped match-one character "_",
** 3. uPattern is an unescaped escape character, or
** 4. uPattern is to be handled as an ordinary character
*/
if( uPattern==MATCH_ALL && !prevEscape && uPattern!=(uint32_t)uEsc ){
/* Case 1. */
uint8_t c;
/* Skip any MATCH_ALL or MATCH_ONE characters that follow a
** MATCH_ALL. For each MATCH_ONE, skip one character in the
** test string.
*/
while( (c=*zPattern) == MATCH_ALL || c == MATCH_ONE ){
if( c==MATCH_ONE ){
if( *zString==0 ) return 0;
SQLITE_ICU_SKIP_UTF8(zString);
}
zPattern++;
}
if( *zPattern==0 ) return 1;
while( *zString ){
if( icuLikeCompare(zPattern, zString, uEsc) ){
return 1;
}
SQLITE_ICU_SKIP_UTF8(zString);
}
return 0;
}else if( uPattern==MATCH_ONE && !prevEscape && uPattern!=(uint32_t)uEsc ){
/* Case 2. */
if( *zString==0 ) return 0;
SQLITE_ICU_SKIP_UTF8(zString);
}else if( uPattern==(uint32_t)uEsc && !prevEscape ){
/* Case 3. */
prevEscape = 1;
}else{
/* Case 4. */
uint32_t uString;
SQLITE_ICU_READ_UTF8(zString, uString);
uString = (uint32_t)u_foldCase((UChar32)uString, U_FOLD_CASE_DEFAULT);
uPattern = (uint32_t)u_foldCase((UChar32)uPattern, U_FOLD_CASE_DEFAULT);
if( uString!=uPattern ){
return 0;
}
prevEscape = 0;
}
}
return *zString==0;
}
/*
** Implementation of the like() SQL function. This function implements
** the build-in LIKE operator. The first argument to the function is the
** pattern and the second argument is the string. So, the SQL statements:
**
** A LIKE B
**
** is implemented as like(B, A). If there is an escape character E,
**
** A LIKE B ESCAPE E
**
** is mapped to like(B, A, E).
*/
static void icuLikeFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
const unsigned char *zA = sqlite3_value_text(argv[0]);
const unsigned char *zB = sqlite3_value_text(argv[1]);
UChar32 uEsc = 0;
/* Limit the length of the LIKE or GLOB pattern to avoid problems
** of deep recursion and N*N behavior in patternCompare().
*/
if( sqlite3_value_bytes(argv[0])>SQLITE_MAX_LIKE_PATTERN_LENGTH ){
sqlite3_result_error(context, "LIKE or GLOB pattern too complex", -1);
return;
}
if( argc==3 ){
/* The escape character string must consist of a single UTF-8 character.
** Otherwise, return an error.
*/
int nE= sqlite3_value_bytes(argv[2]);
const unsigned char *zE = sqlite3_value_text(argv[2]);
int i = 0;
if( zE==0 ) return;
U8_NEXT(zE, i, nE, uEsc);
if( i!=nE){
sqlite3_result_error(context,
"ESCAPE expression must be a single character", -1);
return;
}
}
if( zA && zB ){
sqlite3_result_int(context, icuLikeCompare(zA, zB, uEsc));
}
}
/*
** Function to delete compiled regexp objects. Registered as
** a destructor function with sqlite3_set_auxdata().
*/
static void icuRegexpDelete(void *p){
URegularExpression *pExpr = (URegularExpression *)p;
uregex_close(pExpr);
}
/*
** Implementation of SQLite REGEXP operator. This scalar function takes
** two arguments. The first is a regular expression pattern to compile
** the second is a string to match against that pattern. If either
** argument is an SQL NULL, then NULL Is returned. Otherwise, the result
** is 1 if the string matches the pattern, or 0 otherwise.
**
** SQLite maps the regexp() function to the regexp() operator such
** that the following two are equivalent:
**
** zString REGEXP zPattern
** regexp(zPattern, zString)
**
** Uses the following ICU regexp APIs:
**
** uregex_open()
** uregex_matches()
** uregex_close()
*/
static void icuRegexpFunc(sqlite3_context *p, int nArg, sqlite3_value **apArg){
UErrorCode status = U_ZERO_ERROR;
URegularExpression *pExpr;
UBool res;
const UChar *zString = sqlite3_value_text16(apArg[1]);
(void)nArg; /* Unused parameter */
/* If the left hand side of the regexp operator is NULL,
** then the result is also NULL.
*/
if( !zString ){
return;
}
pExpr = sqlite3_get_auxdata(p, 0);
if( !pExpr ){
const UChar *zPattern = sqlite3_value_text16(apArg[0]);
if( !zPattern ){
return;
}
pExpr = uregex_open(zPattern, -1, 0, 0, &status);
if( U_SUCCESS(status) ){
sqlite3_set_auxdata(p, 0, pExpr, icuRegexpDelete);
pExpr = sqlite3_get_auxdata(p, 0);
}
if( !pExpr ){
icuFunctionError(p, "uregex_open", status);
return;
}
}
/* Configure the text that the regular expression operates on. */
uregex_setText(pExpr, zString, -1, &status);
if( !U_SUCCESS(status) ){
icuFunctionError(p, "uregex_setText", status);
return;
}
/* Attempt the match */
res = uregex_matches(pExpr, 0, &status);
if( !U_SUCCESS(status) ){
icuFunctionError(p, "uregex_matches", status);
return;
}
/* Set the text that the regular expression operates on to a NULL
** pointer. This is not really necessary, but it is tidier than
** leaving the regular expression object configured with an invalid
** pointer after this function returns.
*/
uregex_setText(pExpr, 0, 0, &status);
/* Return 1 or 0. */
sqlite3_result_int(p, res ? 1 : 0);
}
/*
** Implementations of scalar functions for case mapping - upper() and
** lower(). Function upper() converts its input to upper-case (ABC).
** Function lower() converts to lower-case (abc).
**
** ICU provides two types of case mapping, "general" case mapping and
** "language specific". Refer to ICU documentation for the differences
** between the two.
**
** To utilise "general" case mapping, the upper() or lower() scalar
** functions are invoked with one argument:
**
** upper('ABC') -> 'abc'
** lower('abc') -> 'ABC'
**
** To access ICU "language specific" case mapping, upper() or lower()
** should be invoked with two arguments. The second argument is the name
** of the locale to use. Passing an empty string ("") or SQL NULL value
** as the second argument is the same as invoking the 1 argument version
** of upper() or lower().
**
** lower('I', 'en_us') -> 'i'
** lower('I', 'tr_tr') -> '\u131' (small dotless i)
**
** http://www.icu-project.org/userguide/posix.html#case_mappings
*/
static void icuCaseFunc16(sqlite3_context *p, int nArg, sqlite3_value **apArg){
const UChar *zInput; /* Pointer to input string */
UChar *zOutput = 0; /* Pointer to output buffer */
int nInput; /* Size of utf-16 input string in bytes */
int nOut; /* Size of output buffer in bytes */
int cnt;
int bToUpper; /* True for toupper(), false for tolower() */
UErrorCode status;
const char *zLocale = 0;
assert(nArg==1 || nArg==2);
bToUpper = (sqlite3_user_data(p)!=0);
if( nArg==2 ){
zLocale = (const char *)sqlite3_value_text(apArg[1]);
}
zInput = sqlite3_value_text16(apArg[0]);
if( !zInput ){
return;
}
nOut = nInput = sqlite3_value_bytes16(apArg[0]);
if( nOut==0 ){
sqlite3_result_text16(p, "", 0, SQLITE_STATIC);
return;
}
for(cnt=0; cnt<2; cnt++){
UChar *zNew = sqlite3_realloc(zOutput, nOut);
if( zNew==0 ){
sqlite3_free(zOutput);
sqlite3_result_error_nomem(p);
return;
}
zOutput = zNew;
status = U_ZERO_ERROR;
if( bToUpper ){
nOut = 2*u_strToUpper(zOutput,nOut/2,zInput,nInput/2,zLocale,&status);
}else{
nOut = 2*u_strToLower(zOutput,nOut/2,zInput,nInput/2,zLocale,&status);
}
if( U_SUCCESS(status) ){
sqlite3_result_text16(p, zOutput, nOut, xFree);
}else if( status==U_BUFFER_OVERFLOW_ERROR ){
assert( cnt==0 );
continue;
}else{
icuFunctionError(p, bToUpper ? "u_strToUpper" : "u_strToLower", status);
}
return;
}
assert( 0 ); /* Unreachable */
}
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU) */
/*
** Collation sequence destructor function. The pCtx argument points to
** a UCollator structure previously allocated using ucol_open().
*/
static void icuCollationDel(void *pCtx){
UCollator *p = (UCollator *)pCtx;
ucol_close(p);
}
/*
** Collation sequence comparison function. The pCtx argument points to
** a UCollator structure previously allocated using ucol_open().
*/
static int icuCollationColl(
void *pCtx,
int nLeft,
const void *zLeft,
int nRight,
const void *zRight
){
UCollationResult res;
UCollator *p = (UCollator *)pCtx;
res = ucol_strcoll(p, (UChar *)zLeft, nLeft/2, (UChar *)zRight, nRight/2);
switch( res ){
case UCOL_LESS: return -1;
case UCOL_GREATER: return +1;
case UCOL_EQUAL: return 0;
}
assert(!"Unexpected return value from ucol_strcoll()");
return 0;
}
/*
** Implementation of the scalar function icu_load_collation().
**
** This scalar function is used to add ICU collation based collation
** types to an SQLite database connection. It is intended to be called
** as follows:
**
** SELECT icu_load_collation(<locale>, <collation-name>);
**
** Where <locale> is a string containing an ICU locale identifier (i.e.
** "en_AU", "tr_TR" etc.) and <collation-name> is the name of the
** collation sequence to create.
*/
static void icuLoadCollation(
sqlite3_context *p,
int nArg,
sqlite3_value **apArg
){
sqlite3 *db = (sqlite3 *)sqlite3_user_data(p);
UErrorCode status = U_ZERO_ERROR;
const char *zLocale; /* Locale identifier - (eg. "jp_JP") */
const char *zName; /* SQL Collation sequence name (eg. "japanese") */
UCollator *pUCollator; /* ICU library collation object */
int rc; /* Return code from sqlite3_create_collation_x() */
assert(nArg==2);
(void)nArg; /* Unused parameter */
zLocale = (const char *)sqlite3_value_text(apArg[0]);
zName = (const char *)sqlite3_value_text(apArg[1]);
if( !zLocale || !zName ){
return;
}
pUCollator = ucol_open(zLocale, &status);
if( !U_SUCCESS(status) ){
icuFunctionError(p, "ucol_open", status);
return;
}
assert(p);
rc = sqlite3_create_collation_v2(db, zName, SQLITE_UTF16, (void *)pUCollator,
icuCollationColl, icuCollationDel
);
if( rc!=SQLITE_OK ){
ucol_close(pUCollator);
sqlite3_result_error(p, "Error registering collation function", -1);
}
}
/*
** Register the ICU extension functions with database db.
*/
int sqlite3IcuInit(sqlite3 *db){
# define SQLITEICU_EXTRAFLAGS (SQLITE_DETERMINISTIC|SQLITE_INNOCUOUS)
static const struct IcuScalar {
const char *zName; /* Function name */
unsigned char nArg; /* Number of arguments */
unsigned int enc; /* Optimal text encoding */
unsigned char iContext; /* sqlite3_user_data() context */
void (*xFunc)(sqlite3_context*,int,sqlite3_value**);
} scalars[] = {
{"icu_load_collation",2,SQLITE_UTF8|SQLITE_DIRECTONLY,1, icuLoadCollation},
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU)
{"regexp", 2, SQLITE_ANY|SQLITEICU_EXTRAFLAGS, 0, icuRegexpFunc},
{"lower", 1, SQLITE_UTF16|SQLITEICU_EXTRAFLAGS, 0, icuCaseFunc16},
{"lower", 2, SQLITE_UTF16|SQLITEICU_EXTRAFLAGS, 0, icuCaseFunc16},
{"upper", 1, SQLITE_UTF16|SQLITEICU_EXTRAFLAGS, 1, icuCaseFunc16},
{"upper", 2, SQLITE_UTF16|SQLITEICU_EXTRAFLAGS, 1, icuCaseFunc16},
{"lower", 1, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS, 0, icuCaseFunc16},
{"lower", 2, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS, 0, icuCaseFunc16},
{"upper", 1, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS, 1, icuCaseFunc16},
{"upper", 2, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS, 1, icuCaseFunc16},
{"like", 2, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS, 0, icuLikeFunc},
{"like", 3, SQLITE_UTF8|SQLITEICU_EXTRAFLAGS, 0, icuLikeFunc},
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_ICU) */
};
int rc = SQLITE_OK;
int i;
for(i=0; rc==SQLITE_OK && i<(int)(sizeof(scalars)/sizeof(scalars[0])); i++){
const struct IcuScalar *p = &scalars[i];
rc = sqlite3_create_function(
db, p->zName, p->nArg, p->enc,
p->iContext ? (void*)db : (void*)0,
p->xFunc, 0, 0
);
}
return rc;
}
#if !SQLITE_CORE
#ifdef _WIN32
__declspec(dllexport)
#endif
int sqlite3_icu_init(
sqlite3 *db,
char **pzErrMsg,
const sqlite3_api_routines *pApi
){
SQLITE_EXTENSION_INIT2(pApi)
return sqlite3IcuInit(db);
}
#endif
#endif
| 17,263 | 552 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/memdb.c | /*
** 2016-09-07
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file implements an in-memory VFS. A database is held as a contiguous
** block of memory.
**
** This file also implements interface sqlite3_serialize() and
** sqlite3_deserialize().
*/
#include "third_party/sqlite3/sqliteInt.h"
#ifndef SQLITE_OMIT_DESERIALIZE
/*
** Forward declaration of objects used by this utility
*/
typedef struct sqlite3_vfs MemVfs;
typedef struct MemFile MemFile;
typedef struct MemStore MemStore;
/* Access to a lower-level VFS that (might) implement dynamic loading,
** access to randomness, etc.
*/
#define ORIGVFS(p) ((sqlite3_vfs*)((p)->pAppData))
/* Storage for a memdb file.
**
** An memdb object can be shared or separate. Shared memdb objects can be
** used by more than one database connection. Mutexes are used by shared
** memdb objects to coordinate access. Separate memdb objects are only
** connected to a single database connection and do not require additional
** mutexes.
**
** Shared memdb objects have .zFName!=0 and .pMutex!=0. They are created
** using "file:/name?vfs=memdb". The first character of the name must be
** "/" or else the object will be a separate memdb object. All shared
** memdb objects are stored in memdb_g.apMemStore[] in an arbitrary order.
**
** Separate memdb objects are created using a name that does not begin
** with "/" or using sqlite3_deserialize().
**
** Access rules for shared MemStore objects:
**
** * .zFName is initialized when the object is created and afterwards
** is unchanged until the object is destroyed. So it can be accessed
** at any time as long as we know the object is not being destroyed,
** which means while either the SQLITE_MUTEX_STATIC_VFS1 or
** .pMutex is held or the object is not part of memdb_g.apMemStore[].
**
** * Can .pMutex can only be changed while holding the
** SQLITE_MUTEX_STATIC_VFS1 mutex or while the object is not part
** of memdb_g.apMemStore[].
**
** * Other fields can only be changed while holding the .pMutex mutex
** or when the .nRef is less than zero and the object is not part of
** memdb_g.apMemStore[].
**
** * The .aData pointer has the added requirement that it can can only
** be changed (for resizing) when nMmap is zero.
**
*/
struct MemStore {
sqlite3_int64 sz; /* Size of the file */
sqlite3_int64 szAlloc; /* Space allocated to aData */
sqlite3_int64 szMax; /* Maximum allowed size of the file */
unsigned char *aData; /* content of the file */
sqlite3_mutex *pMutex; /* Used by shared stores only */
int nMmap; /* Number of memory mapped pages */
unsigned mFlags; /* Flags */
int nRdLock; /* Number of readers */
int nWrLock; /* Number of writers. (Always 0 or 1) */
int nRef; /* Number of users of this MemStore */
char *zFName; /* The filename for shared stores */
};
/* An open file */
struct MemFile {
sqlite3_file base; /* IO methods */
MemStore *pStore; /* The storage */
int eLock; /* Most recent lock against this file */
};
/*
** File-scope variables for holding the memdb files that are accessible
** to multiple database connections in separate threads.
**
** Must hold SQLITE_MUTEX_STATIC_VFS1 to access any part of this object.
*/
static struct MemFS {
int nMemStore; /* Number of shared MemStore objects */
MemStore **apMemStore; /* Array of all shared MemStore objects */
} memdb_g;
/*
** Methods for MemFile
*/
static int memdbClose(sqlite3_file*);
static int memdbRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
static int memdbWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst);
static int memdbTruncate(sqlite3_file*, sqlite3_int64 size);
static int memdbSync(sqlite3_file*, int flags);
static int memdbFileSize(sqlite3_file*, sqlite3_int64 *pSize);
static int memdbLock(sqlite3_file*, int);
/* static int memdbCheckReservedLock(sqlite3_file*, int *pResOut);// not used */
static int memdbFileControl(sqlite3_file*, int op, void *pArg);
/* static int memdbSectorSize(sqlite3_file*); // not used */
static int memdbDeviceCharacteristics(sqlite3_file*);
static int memdbFetch(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp);
static int memdbUnfetch(sqlite3_file*, sqlite3_int64 iOfst, void *p);
/*
** Methods for MemVfs
*/
static int memdbOpen(sqlite3_vfs*, const char *, sqlite3_file*, int , int *);
/* static int memdbDelete(sqlite3_vfs*, const char *zName, int syncDir); */
static int memdbAccess(sqlite3_vfs*, const char *zName, int flags, int *);
static int memdbFullPathname(sqlite3_vfs*, const char *zName, int, char *zOut);
static void *memdbDlOpen(sqlite3_vfs*, const char *zFilename);
static void memdbDlError(sqlite3_vfs*, int nByte, char *zErrMsg);
static void (*memdbDlSym(sqlite3_vfs *pVfs, void *p, const char*zSym))(void);
static void memdbDlClose(sqlite3_vfs*, void*);
static int memdbRandomness(sqlite3_vfs*, int nByte, char *zOut);
static int memdbSleep(sqlite3_vfs*, int microseconds);
/* static int memdbCurrentTime(sqlite3_vfs*, double*); */
static int memdbGetLastError(sqlite3_vfs*, int, char *);
static int memdbCurrentTimeInt64(sqlite3_vfs*, sqlite3_int64*);
static sqlite3_vfs memdb_vfs = {
2, /* iVersion */
0, /* szOsFile (set when registered) */
1024, /* mxPathname */
0, /* pNext */
"memdb", /* zName */
0, /* pAppData (set when registered) */
memdbOpen, /* xOpen */
0, /* memdbDelete, */ /* xDelete */
memdbAccess, /* xAccess */
memdbFullPathname, /* xFullPathname */
memdbDlOpen, /* xDlOpen */
memdbDlError, /* xDlError */
memdbDlSym, /* xDlSym */
memdbDlClose, /* xDlClose */
memdbRandomness, /* xRandomness */
memdbSleep, /* xSleep */
0, /* memdbCurrentTime, */ /* xCurrentTime */
memdbGetLastError, /* xGetLastError */
memdbCurrentTimeInt64, /* xCurrentTimeInt64 */
0, /* xSetSystemCall */
0, /* xGetSystemCall */
0, /* xNextSystemCall */
};
static const sqlite3_io_methods memdb_io_methods = {
3, /* iVersion */
memdbClose, /* xClose */
memdbRead, /* xRead */
memdbWrite, /* xWrite */
memdbTruncate, /* xTruncate */
memdbSync, /* xSync */
memdbFileSize, /* xFileSize */
memdbLock, /* xLock */
memdbLock, /* xUnlock - same as xLock in this case */
0, /* memdbCheckReservedLock, */ /* xCheckReservedLock */
memdbFileControl, /* xFileControl */
0, /* memdbSectorSize,*/ /* xSectorSize */
memdbDeviceCharacteristics, /* xDeviceCharacteristics */
0, /* xShmMap */
0, /* xShmLock */
0, /* xShmBarrier */
0, /* xShmUnmap */
memdbFetch, /* xFetch */
memdbUnfetch /* xUnfetch */
};
/*
** Enter/leave the mutex on a MemStore
*/
#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE==0
static void memdbEnter(MemStore *p){
UNUSED_PARAMETER(p);
}
static void memdbLeave(MemStore *p){
UNUSED_PARAMETER(p);
}
#else
static void memdbEnter(MemStore *p){
sqlite3_mutex_enter(p->pMutex);
}
static void memdbLeave(MemStore *p){
sqlite3_mutex_leave(p->pMutex);
}
#endif
/*
** Close an memdb-file.
** Free the underlying MemStore object when its refcount drops to zero
** or less.
*/
static int memdbClose(sqlite3_file *pFile){
MemStore *p = ((MemFile*)pFile)->pStore;
if( p->zFName ){
int i;
#ifndef SQLITE_MUTEX_OMIT
sqlite3_mutex *pVfsMutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
#endif
sqlite3_mutex_enter(pVfsMutex);
for(i=0; ALWAYS(i<memdb_g.nMemStore); i++){
if( memdb_g.apMemStore[i]==p ){
memdbEnter(p);
if( p->nRef==1 ){
memdb_g.apMemStore[i] = memdb_g.apMemStore[--memdb_g.nMemStore];
if( memdb_g.nMemStore==0 ){
sqlite3_free(memdb_g.apMemStore);
memdb_g.apMemStore = 0;
}
}
break;
}
}
sqlite3_mutex_leave(pVfsMutex);
}else{
memdbEnter(p);
}
p->nRef--;
if( p->nRef<=0 ){
if( p->mFlags & SQLITE_DESERIALIZE_FREEONCLOSE ){
sqlite3_free(p->aData);
}
memdbLeave(p);
sqlite3_mutex_free(p->pMutex);
sqlite3_free(p);
}else{
memdbLeave(p);
}
return SQLITE_OK;
}
/*
** Read data from an memdb-file.
*/
static int memdbRead(
sqlite3_file *pFile,
void *zBuf,
int iAmt,
sqlite_int64 iOfst
){
MemStore *p = ((MemFile*)pFile)->pStore;
memdbEnter(p);
if( iOfst+iAmt>p->sz ){
memset(zBuf, 0, iAmt);
if( iOfst<p->sz ) memcpy(zBuf, p->aData+iOfst, p->sz - iOfst);
memdbLeave(p);
return SQLITE_IOERR_SHORT_READ;
}
memcpy(zBuf, p->aData+iOfst, iAmt);
memdbLeave(p);
return SQLITE_OK;
}
/*
** Try to enlarge the memory allocation to hold at least sz bytes
*/
static int memdbEnlarge(MemStore *p, sqlite3_int64 newSz){
unsigned char *pNew;
if( (p->mFlags & SQLITE_DESERIALIZE_RESIZEABLE)==0 || NEVER(p->nMmap>0) ){
return SQLITE_FULL;
}
if( newSz>p->szMax ){
return SQLITE_FULL;
}
newSz *= 2;
if( newSz>p->szMax ) newSz = p->szMax;
pNew = sqlite3Realloc(p->aData, newSz);
if( pNew==0 ) return SQLITE_IOERR_NOMEM;
p->aData = pNew;
p->szAlloc = newSz;
return SQLITE_OK;
}
/*
** Write data to an memdb-file.
*/
static int memdbWrite(
sqlite3_file *pFile,
const void *z,
int iAmt,
sqlite_int64 iOfst
){
MemStore *p = ((MemFile*)pFile)->pStore;
memdbEnter(p);
if( NEVER(p->mFlags & SQLITE_DESERIALIZE_READONLY) ){
/* Can't happen: memdbLock() will return SQLITE_READONLY before
** reaching this point */
memdbLeave(p);
return SQLITE_IOERR_WRITE;
}
if( iOfst+iAmt>p->sz ){
int rc;
if( iOfst+iAmt>p->szAlloc
&& (rc = memdbEnlarge(p, iOfst+iAmt))!=SQLITE_OK
){
memdbLeave(p);
return rc;
}
if( iOfst>p->sz ) memset(p->aData+p->sz, 0, iOfst-p->sz);
p->sz = iOfst+iAmt;
}
memcpy(p->aData+iOfst, z, iAmt);
memdbLeave(p);
return SQLITE_OK;
}
/*
** Truncate an memdb-file.
**
** In rollback mode (which is always the case for memdb, as it does not
** support WAL mode) the truncate() method is only used to reduce
** the size of a file, never to increase the size.
*/
static int memdbTruncate(sqlite3_file *pFile, sqlite_int64 size){
MemStore *p = ((MemFile*)pFile)->pStore;
int rc = SQLITE_OK;
memdbEnter(p);
if( size>p->sz ){
/* This can only happen with a corrupt wal mode db */
rc = SQLITE_CORRUPT;
}else{
p->sz = size;
}
memdbLeave(p);
return rc;
}
/*
** Sync an memdb-file.
*/
static int memdbSync(sqlite3_file *pFile, int flags){
UNUSED_PARAMETER(pFile);
UNUSED_PARAMETER(flags);
return SQLITE_OK;
}
/*
** Return the current file-size of an memdb-file.
*/
static int memdbFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
MemStore *p = ((MemFile*)pFile)->pStore;
memdbEnter(p);
*pSize = p->sz;
memdbLeave(p);
return SQLITE_OK;
}
/*
** Lock an memdb-file.
*/
static int memdbLock(sqlite3_file *pFile, int eLock){
MemFile *pThis = (MemFile*)pFile;
MemStore *p = pThis->pStore;
int rc = SQLITE_OK;
if( eLock==pThis->eLock ) return SQLITE_OK;
memdbEnter(p);
if( eLock>SQLITE_LOCK_SHARED ){
if( p->mFlags & SQLITE_DESERIALIZE_READONLY ){
rc = SQLITE_READONLY;
}else if( pThis->eLock<=SQLITE_LOCK_SHARED ){
if( p->nWrLock ){
rc = SQLITE_BUSY;
}else{
p->nWrLock = 1;
}
}
}else if( eLock==SQLITE_LOCK_SHARED ){
if( pThis->eLock > SQLITE_LOCK_SHARED ){
assert( p->nWrLock==1 );
p->nWrLock = 0;
}else if( p->nWrLock ){
rc = SQLITE_BUSY;
}else{
p->nRdLock++;
}
}else{
assert( eLock==SQLITE_LOCK_NONE );
if( pThis->eLock>SQLITE_LOCK_SHARED ){
assert( p->nWrLock==1 );
p->nWrLock = 0;
}
assert( p->nRdLock>0 );
p->nRdLock--;
}
if( rc==SQLITE_OK ) pThis->eLock = eLock;
memdbLeave(p);
return rc;
}
#if 0
/*
** This interface is only used for crash recovery, which does not
** occur on an in-memory database.
*/
static int memdbCheckReservedLock(sqlite3_file *pFile, int *pResOut){
*pResOut = 0;
return SQLITE_OK;
}
#endif
/*
** File control method. For custom operations on an memdb-file.
*/
static int memdbFileControl(sqlite3_file *pFile, int op, void *pArg){
MemStore *p = ((MemFile*)pFile)->pStore;
int rc = SQLITE_NOTFOUND;
memdbEnter(p);
if( op==SQLITE_FCNTL_VFSNAME ){
*(char**)pArg = sqlite3_mprintf("memdb(%p,%lld)", p->aData, p->sz);
rc = SQLITE_OK;
}
if( op==SQLITE_FCNTL_SIZE_LIMIT ){
sqlite3_int64 iLimit = *(sqlite3_int64*)pArg;
if( iLimit<p->sz ){
if( iLimit<0 ){
iLimit = p->szMax;
}else{
iLimit = p->sz;
}
}
p->szMax = iLimit;
*(sqlite3_int64*)pArg = iLimit;
rc = SQLITE_OK;
}
memdbLeave(p);
return rc;
}
#if 0 /* Not used because of SQLITE_IOCAP_POWERSAFE_OVERWRITE */
/*
** Return the sector-size in bytes for an memdb-file.
*/
static int memdbSectorSize(sqlite3_file *pFile){
return 1024;
}
#endif
/*
** Return the device characteristic flags supported by an memdb-file.
*/
static int memdbDeviceCharacteristics(sqlite3_file *pFile){
UNUSED_PARAMETER(pFile);
return SQLITE_IOCAP_ATOMIC |
SQLITE_IOCAP_POWERSAFE_OVERWRITE |
SQLITE_IOCAP_SAFE_APPEND |
SQLITE_IOCAP_SEQUENTIAL;
}
/* Fetch a page of a memory-mapped file */
static int memdbFetch(
sqlite3_file *pFile,
sqlite3_int64 iOfst,
int iAmt,
void **pp
){
MemStore *p = ((MemFile*)pFile)->pStore;
memdbEnter(p);
if( iOfst+iAmt>p->sz || (p->mFlags & SQLITE_DESERIALIZE_RESIZEABLE)!=0 ){
*pp = 0;
}else{
p->nMmap++;
*pp = (void*)(p->aData + iOfst);
}
memdbLeave(p);
return SQLITE_OK;
}
/* Release a memory-mapped page */
static int memdbUnfetch(sqlite3_file *pFile, sqlite3_int64 iOfst, void *pPage){
MemStore *p = ((MemFile*)pFile)->pStore;
UNUSED_PARAMETER(iOfst);
UNUSED_PARAMETER(pPage);
memdbEnter(p);
p->nMmap--;
memdbLeave(p);
return SQLITE_OK;
}
/*
** Open an mem file handle.
*/
static int memdbOpen(
sqlite3_vfs *pVfs,
const char *zName,
sqlite3_file *pFd,
int flags,
int *pOutFlags
){
MemFile *pFile = (MemFile*)pFd;
MemStore *p = 0;
int szName;
UNUSED_PARAMETER(pVfs);
memset(pFile, 0, sizeof(*pFile));
szName = sqlite3Strlen30(zName);
if( szName>1 && zName[0]=='/' ){
int i;
#ifndef SQLITE_MUTEX_OMIT
sqlite3_mutex *pVfsMutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
#endif
sqlite3_mutex_enter(pVfsMutex);
for(i=0; i<memdb_g.nMemStore; i++){
if( strcmp(memdb_g.apMemStore[i]->zFName,zName)==0 ){
p = memdb_g.apMemStore[i];
break;
}
}
if( p==0 ){
MemStore **apNew;
p = sqlite3Malloc( sizeof(*p) + szName + 3 );
if( p==0 ){
sqlite3_mutex_leave(pVfsMutex);
return SQLITE_NOMEM;
}
apNew = sqlite3Realloc(memdb_g.apMemStore,
sizeof(apNew[0])*(memdb_g.nMemStore+1) );
if( apNew==0 ){
sqlite3_free(p);
sqlite3_mutex_leave(pVfsMutex);
return SQLITE_NOMEM;
}
apNew[memdb_g.nMemStore++] = p;
memdb_g.apMemStore = apNew;
memset(p, 0, sizeof(*p));
p->mFlags = SQLITE_DESERIALIZE_RESIZEABLE|SQLITE_DESERIALIZE_FREEONCLOSE;
p->szMax = sqlite3GlobalConfig.mxMemdbSize;
p->zFName = (char*)&p[1];
memcpy(p->zFName, zName, szName+1);
p->pMutex = sqlite3_mutex_alloc(SQLITE_MUTEX_FAST);
if( p->pMutex==0 ){
memdb_g.nMemStore--;
sqlite3_free(p);
sqlite3_mutex_leave(pVfsMutex);
return SQLITE_NOMEM;
}
p->nRef = 1;
memdbEnter(p);
}else{
memdbEnter(p);
p->nRef++;
}
sqlite3_mutex_leave(pVfsMutex);
}else{
p = sqlite3Malloc( sizeof(*p) );
if( p==0 ){
return SQLITE_NOMEM;
}
memset(p, 0, sizeof(*p));
p->mFlags = SQLITE_DESERIALIZE_RESIZEABLE | SQLITE_DESERIALIZE_FREEONCLOSE;
p->szMax = sqlite3GlobalConfig.mxMemdbSize;
}
pFile->pStore = p;
if( pOutFlags!=0 ){
*pOutFlags = flags | SQLITE_OPEN_MEMORY;
}
pFd->pMethods = &memdb_io_methods;
memdbLeave(p);
return SQLITE_OK;
}
#if 0 /* Only used to delete rollback journals, super-journals, and WAL
** files, none of which exist in memdb. So this routine is never used */
/*
** Delete the file located at zPath. If the dirSync argument is true,
** ensure the file-system modifications are synced to disk before
** returning.
*/
static int memdbDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
return SQLITE_IOERR_DELETE;
}
#endif
/*
** Test for access permissions. Return true if the requested permission
** is available, or false otherwise.
**
** With memdb, no files ever exist on disk. So always return false.
*/
static int memdbAccess(
sqlite3_vfs *pVfs,
const char *zPath,
int flags,
int *pResOut
){
UNUSED_PARAMETER(pVfs);
UNUSED_PARAMETER(zPath);
UNUSED_PARAMETER(flags);
*pResOut = 0;
return SQLITE_OK;
}
/*
** Populate buffer zOut with the full canonical pathname corresponding
** to the pathname in zPath. zOut is guaranteed to point to a buffer
** of at least (INST_MAX_PATHNAME+1) bytes.
*/
static int memdbFullPathname(
sqlite3_vfs *pVfs,
const char *zPath,
int nOut,
char *zOut
){
UNUSED_PARAMETER(pVfs);
sqlite3_snprintf(nOut, zOut, "%s", zPath);
return SQLITE_OK;
}
/*
** Open the dynamic library located at zPath and return a handle.
*/
static void *memdbDlOpen(sqlite3_vfs *pVfs, const char *zPath){
return ORIGVFS(pVfs)->xDlOpen(ORIGVFS(pVfs), zPath);
}
/*
** Populate the buffer zErrMsg (size nByte bytes) with a human readable
** utf-8 string describing the most recent error encountered associated
** with dynamic libraries.
*/
static void memdbDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
ORIGVFS(pVfs)->xDlError(ORIGVFS(pVfs), nByte, zErrMsg);
}
/*
** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
*/
static void (*memdbDlSym(sqlite3_vfs *pVfs, void *p, const char *zSym))(void){
return ORIGVFS(pVfs)->xDlSym(ORIGVFS(pVfs), p, zSym);
}
/*
** Close the dynamic library handle pHandle.
*/
static void memdbDlClose(sqlite3_vfs *pVfs, void *pHandle){
ORIGVFS(pVfs)->xDlClose(ORIGVFS(pVfs), pHandle);
}
/*
** Populate the buffer pointed to by zBufOut with nByte bytes of
** random data.
*/
static int memdbRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
return ORIGVFS(pVfs)->xRandomness(ORIGVFS(pVfs), nByte, zBufOut);
}
/*
** Sleep for nMicro microseconds. Return the number of microseconds
** actually slept.
*/
static int memdbSleep(sqlite3_vfs *pVfs, int nMicro){
return ORIGVFS(pVfs)->xSleep(ORIGVFS(pVfs), nMicro);
}
#if 0 /* Never used. Modern cores only call xCurrentTimeInt64() */
/*
** Return the current time as a Julian Day number in *pTimeOut.
*/
static int memdbCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
return ORIGVFS(pVfs)->xCurrentTime(ORIGVFS(pVfs), pTimeOut);
}
#endif
static int memdbGetLastError(sqlite3_vfs *pVfs, int a, char *b){
return ORIGVFS(pVfs)->xGetLastError(ORIGVFS(pVfs), a, b);
}
static int memdbCurrentTimeInt64(sqlite3_vfs *pVfs, sqlite3_int64 *p){
return ORIGVFS(pVfs)->xCurrentTimeInt64(ORIGVFS(pVfs), p);
}
/*
** Translate a database connection pointer and schema name into a
** MemFile pointer.
*/
static MemFile *memdbFromDbSchema(sqlite3 *db, const char *zSchema){
MemFile *p = 0;
MemStore *pStore;
int rc = sqlite3_file_control(db, zSchema, SQLITE_FCNTL_FILE_POINTER, &p);
if( rc ) return 0;
if( p->base.pMethods!=&memdb_io_methods ) return 0;
pStore = p->pStore;
memdbEnter(pStore);
if( pStore->zFName!=0 ) p = 0;
memdbLeave(pStore);
return p;
}
/*
** Return the serialization of a database
*/
unsigned char *sqlite3_serialize(
sqlite3 *db, /* The database connection */
const char *zSchema, /* Which database within the connection */
sqlite3_int64 *piSize, /* Write size here, if not NULL */
unsigned int mFlags /* Maybe SQLITE_SERIALIZE_NOCOPY */
){
MemFile *p;
int iDb;
Btree *pBt;
sqlite3_int64 sz;
int szPage = 0;
sqlite3_stmt *pStmt = 0;
unsigned char *pOut;
char *zSql;
int rc;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
if( zSchema==0 ) zSchema = db->aDb[0].zDbSName;
p = memdbFromDbSchema(db, zSchema);
iDb = sqlite3FindDbName(db, zSchema);
if( piSize ) *piSize = -1;
if( iDb<0 ) return 0;
if( p ){
MemStore *pStore = p->pStore;
assert( pStore->pMutex==0 );
if( piSize ) *piSize = pStore->sz;
if( mFlags & SQLITE_SERIALIZE_NOCOPY ){
pOut = pStore->aData;
}else{
pOut = sqlite3_malloc64( pStore->sz );
if( pOut ) memcpy(pOut, pStore->aData, pStore->sz);
}
return pOut;
}
pBt = db->aDb[iDb].pBt;
if( pBt==0 ) return 0;
szPage = sqlite3BtreeGetPageSize(pBt);
zSql = sqlite3_mprintf("PRAGMA \"%w\".page_count", zSchema);
rc = zSql ? sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0) : SQLITE_NOMEM;
sqlite3_free(zSql);
if( rc ) return 0;
rc = sqlite3_step(pStmt);
if( rc!=SQLITE_ROW ){
pOut = 0;
}else{
sz = sqlite3_column_int64(pStmt, 0)*szPage;
if( piSize ) *piSize = sz;
if( mFlags & SQLITE_SERIALIZE_NOCOPY ){
pOut = 0;
}else{
pOut = sqlite3_malloc64( sz );
if( pOut ){
int nPage = sqlite3_column_int(pStmt, 0);
Pager *pPager = sqlite3BtreePager(pBt);
int pgno;
for(pgno=1; pgno<=nPage; pgno++){
DbPage *pPage = 0;
unsigned char *pTo = pOut + szPage*(sqlite3_int64)(pgno-1);
rc = sqlite3PagerGet(pPager, pgno, (DbPage**)&pPage, 0);
if( rc==SQLITE_OK ){
memcpy(pTo, sqlite3PagerGetData(pPage), szPage);
}else{
memset(pTo, 0, szPage);
}
sqlite3PagerUnref(pPage);
}
}
}
}
sqlite3_finalize(pStmt);
return pOut;
}
/* Convert zSchema to a MemDB and initialize its content.
*/
int sqlite3_deserialize(
sqlite3 *db, /* The database connection */
const char *zSchema, /* Which DB to reopen with the deserialization */
unsigned char *pData, /* The serialized database content */
sqlite3_int64 szDb, /* Number bytes in the deserialization */
sqlite3_int64 szBuf, /* Total size of buffer pData[] */
unsigned mFlags /* Zero or more SQLITE_DESERIALIZE_* flags */
){
MemFile *p;
char *zSql;
sqlite3_stmt *pStmt = 0;
int rc;
int iDb;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ){
return SQLITE_MISUSE_BKPT;
}
if( szDb<0 ) return SQLITE_MISUSE_BKPT;
if( szBuf<0 ) return SQLITE_MISUSE_BKPT;
#endif
sqlite3_mutex_enter(db->mutex);
if( zSchema==0 ) zSchema = db->aDb[0].zDbSName;
iDb = sqlite3FindDbName(db, zSchema);
testcase( iDb==1 );
if( iDb<2 && iDb!=0 ){
rc = SQLITE_ERROR;
goto end_deserialize;
}
zSql = sqlite3_mprintf("ATTACH x AS %Q", zSchema);
if( zSql==0 ){
rc = SQLITE_NOMEM;
}else{
rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
sqlite3_free(zSql);
}
if( rc ) goto end_deserialize;
db->init.iDb = (u8)iDb;
db->init.reopenMemdb = 1;
rc = sqlite3_step(pStmt);
db->init.reopenMemdb = 0;
if( rc!=SQLITE_DONE ){
rc = SQLITE_ERROR;
goto end_deserialize;
}
p = memdbFromDbSchema(db, zSchema);
if( p==0 ){
rc = SQLITE_ERROR;
}else{
MemStore *pStore = p->pStore;
pStore->aData = pData;
pData = 0;
pStore->sz = szDb;
pStore->szAlloc = szBuf;
pStore->szMax = szBuf;
if( pStore->szMax<sqlite3GlobalConfig.mxMemdbSize ){
pStore->szMax = sqlite3GlobalConfig.mxMemdbSize;
}
pStore->mFlags = mFlags;
rc = SQLITE_OK;
}
end_deserialize:
sqlite3_finalize(pStmt);
if( pData && (mFlags & SQLITE_DESERIALIZE_FREEONCLOSE)!=0 ){
sqlite3_free(pData);
}
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** This routine is called when the extension is loaded.
** Register the new VFS.
*/
int sqlite3MemdbInit(void){
sqlite3_vfs *pLower = sqlite3_vfs_find(0);
unsigned int sz;
if( NEVER(pLower==0) ) return SQLITE_ERROR;
sz = pLower->szOsFile;
memdb_vfs.pAppData = pLower;
/* The following conditional can only be true when compiled for
** Windows x86 and SQLITE_MAX_MMAP_SIZE=0. We always leave
** it in, to be safe, but it is marked as NO_TEST since there
** is no way to reach it under most builds. */
if( sz<sizeof(MemFile) ) sz = sizeof(MemFile); /*NO_TEST*/
memdb_vfs.szOsFile = sz;
return sqlite3_vfs_register(&memdb_vfs, 0);
}
#endif /* SQLITE_OMIT_DESERIALIZE */
| 25,804 | 879 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/bitvec.c | /*
** 2008 February 16
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file implements an object that represents a fixed-length
** bitmap. Bits are numbered starting with 1.
**
** A bitmap is used to record which pages of a database file have been
** journalled during a transaction, or which pages have the "dont-write"
** property. Usually only a few pages are meet either condition.
** So the bitmap is usually sparse and has low cardinality.
** But sometimes (for example when during a DROP of a large table) most
** or all of the pages in a database can get journalled. In those cases,
** the bitmap becomes dense with high cardinality. The algorithm needs
** to handle both cases well.
**
** The size of the bitmap is fixed when the object is created.
**
** All bits are clear when the bitmap is created. Individual bits
** may be set or cleared one at a time.
**
** Test operations are about 100 times more common that set operations.
** Clear operations are exceedingly rare. There are usually between
** 5 and 500 set operations per Bitvec object, though the number of sets can
** sometimes grow into tens of thousands or larger. The size of the
** Bitvec object is the number of pages in the database file at the
** start of a transaction, and is thus usually less than a few thousand,
** but can be as large as 2 billion for a really big database.
*/
#include "third_party/sqlite3/sqliteInt.h"
/* Size of the Bitvec structure in bytes. */
#define BITVEC_SZ 512
/* Round the union size down to the nearest pointer boundary, since that's how
** it will be aligned within the Bitvec struct. */
#define BITVEC_USIZE \
(((BITVEC_SZ-(3*sizeof(u32)))/sizeof(Bitvec*))*sizeof(Bitvec*))
/* Type of the array "element" for the bitmap representation.
** Should be a power of 2, and ideally, evenly divide into BITVEC_USIZE.
** Setting this to the "natural word" size of your CPU may improve
** performance. */
#define BITVEC_TELEM u8
/* Size, in bits, of the bitmap element. */
#define BITVEC_SZELEM 8
/* Number of elements in a bitmap array. */
#define BITVEC_NELEM (BITVEC_USIZE/sizeof(BITVEC_TELEM))
/* Number of bits in the bitmap array. */
#define BITVEC_NBIT (BITVEC_NELEM*BITVEC_SZELEM)
/* Number of u32 values in hash table. */
#define BITVEC_NINT (BITVEC_USIZE/sizeof(u32))
/* Maximum number of entries in hash table before
** sub-dividing and re-hashing. */
#define BITVEC_MXHASH (BITVEC_NINT/2)
/* Hashing function for the aHash representation.
** Empirical testing showed that the *37 multiplier
** (an arbitrary prime)in the hash function provided
** no fewer collisions than the no-op *1. */
#define BITVEC_HASH(X) (((X)*1)%BITVEC_NINT)
#define BITVEC_NPTR (BITVEC_USIZE/sizeof(Bitvec *))
/*
** A bitmap is an instance of the following structure.
**
** This bitmap records the existence of zero or more bits
** with values between 1 and iSize, inclusive.
**
** There are three possible representations of the bitmap.
** If iSize<=BITVEC_NBIT, then Bitvec.u.aBitmap[] is a straight
** bitmap. The least significant bit is bit 1.
**
** If iSize>BITVEC_NBIT and iDivisor==0 then Bitvec.u.aHash[] is
** a hash table that will hold up to BITVEC_MXHASH distinct values.
**
** Otherwise, the value i is redirected into one of BITVEC_NPTR
** sub-bitmaps pointed to by Bitvec.u.apSub[]. Each subbitmap
** handles up to iDivisor separate values of i. apSub[0] holds
** values between 1 and iDivisor. apSub[1] holds values between
** iDivisor+1 and 2*iDivisor. apSub[N] holds values between
** N*iDivisor+1 and (N+1)*iDivisor. Each subbitmap is normalized
** to hold deal with values between 1 and iDivisor.
*/
struct Bitvec {
u32 iSize; /* Maximum bit index. Max iSize is 4,294,967,296. */
u32 nSet; /* Number of bits that are set - only valid for aHash
** element. Max is BITVEC_NINT. For BITVEC_SZ of 512,
** this would be 125. */
u32 iDivisor; /* Number of bits handled by each apSub[] entry. */
/* Should >=0 for apSub element. */
/* Max iDivisor is max(u32) / BITVEC_NPTR + 1. */
/* For a BITVEC_SZ of 512, this would be 34,359,739. */
union {
BITVEC_TELEM aBitmap[BITVEC_NELEM]; /* Bitmap representation */
u32 aHash[BITVEC_NINT]; /* Hash table representation */
Bitvec *apSub[BITVEC_NPTR]; /* Recursive representation */
} u;
};
/*
** Create a new bitmap object able to handle bits between 0 and iSize,
** inclusive. Return a pointer to the new object. Return NULL if
** malloc fails.
*/
Bitvec *sqlite3BitvecCreate(u32 iSize){
Bitvec *p;
assert( sizeof(*p)==BITVEC_SZ );
p = sqlite3MallocZero( sizeof(*p) );
if( p ){
p->iSize = iSize;
}
return p;
}
/*
** Check to see if the i-th bit is set. Return true or false.
** If p is NULL (if the bitmap has not been created) or if
** i is out of range, then return false.
*/
int sqlite3BitvecTestNotNull(Bitvec *p, u32 i){
assert( p!=0 );
i--;
if( i>=p->iSize ) return 0;
while( p->iDivisor ){
u32 bin = i/p->iDivisor;
i = i%p->iDivisor;
p = p->u.apSub[bin];
if (!p) {
return 0;
}
}
if( p->iSize<=BITVEC_NBIT ){
return (p->u.aBitmap[i/BITVEC_SZELEM] & (1<<(i&(BITVEC_SZELEM-1))))!=0;
} else{
u32 h = BITVEC_HASH(i++);
while( p->u.aHash[h] ){
if( p->u.aHash[h]==i ) return 1;
h = (h+1) % BITVEC_NINT;
}
return 0;
}
}
int sqlite3BitvecTest(Bitvec *p, u32 i){
return p!=0 && sqlite3BitvecTestNotNull(p,i);
}
/*
** Set the i-th bit. Return 0 on success and an error code if
** anything goes wrong.
**
** This routine might cause sub-bitmaps to be allocated. Failing
** to get the memory needed to hold the sub-bitmap is the only
** that can go wrong with an insert, assuming p and i are valid.
**
** The calling function must ensure that p is a valid Bitvec object
** and that the value for "i" is within range of the Bitvec object.
** Otherwise the behavior is undefined.
*/
int sqlite3BitvecSet(Bitvec *p, u32 i){
u32 h;
if( p==0 ) return SQLITE_OK;
assert( i>0 );
assert( i<=p->iSize );
i--;
while((p->iSize > BITVEC_NBIT) && p->iDivisor) {
u32 bin = i/p->iDivisor;
i = i%p->iDivisor;
if( p->u.apSub[bin]==0 ){
p->u.apSub[bin] = sqlite3BitvecCreate( p->iDivisor );
if( p->u.apSub[bin]==0 ) return SQLITE_NOMEM_BKPT;
}
p = p->u.apSub[bin];
}
if( p->iSize<=BITVEC_NBIT ){
p->u.aBitmap[i/BITVEC_SZELEM] |= 1 << (i&(BITVEC_SZELEM-1));
return SQLITE_OK;
}
h = BITVEC_HASH(i++);
/* if there wasn't a hash collision, and this doesn't */
/* completely fill the hash, then just add it without */
/* worring about sub-dividing and re-hashing. */
if( !p->u.aHash[h] ){
if (p->nSet<(BITVEC_NINT-1)) {
goto bitvec_set_end;
} else {
goto bitvec_set_rehash;
}
}
/* there was a collision, check to see if it's already */
/* in hash, if not, try to find a spot for it */
do {
if( p->u.aHash[h]==i ) return SQLITE_OK;
h++;
if( h>=BITVEC_NINT ) h = 0;
} while( p->u.aHash[h] );
/* we didn't find it in the hash. h points to the first */
/* available free spot. check to see if this is going to */
/* make our hash too "full". */
bitvec_set_rehash:
if( p->nSet>=BITVEC_MXHASH ){
unsigned int j;
int rc;
u32 *aiValues = sqlite3StackAllocRaw(0, sizeof(p->u.aHash));
if( aiValues==0 ){
return SQLITE_NOMEM_BKPT;
}else{
memcpy(aiValues, p->u.aHash, sizeof(p->u.aHash));
memset(p->u.apSub, 0, sizeof(p->u.apSub));
p->iDivisor = (p->iSize + BITVEC_NPTR - 1)/BITVEC_NPTR;
rc = sqlite3BitvecSet(p, i);
for(j=0; j<BITVEC_NINT; j++){
if( aiValues[j] ) rc |= sqlite3BitvecSet(p, aiValues[j]);
}
sqlite3StackFree(0, aiValues);
return rc;
}
}
bitvec_set_end:
p->nSet++;
p->u.aHash[h] = i;
return SQLITE_OK;
}
/*
** Clear the i-th bit.
**
** pBuf must be a pointer to at least BITVEC_SZ bytes of temporary storage
** that BitvecClear can use to rebuilt its hash table.
*/
void sqlite3BitvecClear(Bitvec *p, u32 i, void *pBuf){
if( p==0 ) return;
assert( i>0 );
i--;
while( p->iDivisor ){
u32 bin = i/p->iDivisor;
i = i%p->iDivisor;
p = p->u.apSub[bin];
if (!p) {
return;
}
}
if( p->iSize<=BITVEC_NBIT ){
p->u.aBitmap[i/BITVEC_SZELEM] &= ~(1 << (i&(BITVEC_SZELEM-1)));
}else{
unsigned int j;
u32 *aiValues = pBuf;
memcpy(aiValues, p->u.aHash, sizeof(p->u.aHash));
memset(p->u.aHash, 0, sizeof(p->u.aHash));
p->nSet = 0;
for(j=0; j<BITVEC_NINT; j++){
if( aiValues[j] && aiValues[j]!=(i+1) ){
u32 h = BITVEC_HASH(aiValues[j]-1);
p->nSet++;
while( p->u.aHash[h] ){
h++;
if( h>=BITVEC_NINT ) h = 0;
}
p->u.aHash[h] = aiValues[j];
}
}
}
}
/*
** Destroy a bitmap object. Reclaim all memory used.
*/
void sqlite3BitvecDestroy(Bitvec *p){
if( p==0 ) return;
if( p->iDivisor ){
unsigned int i;
for(i=0; i<BITVEC_NPTR; i++){
sqlite3BitvecDestroy(p->u.apSub[i]);
}
}
sqlite3_free(p);
}
/*
** Return the value of the iSize parameter specified when Bitvec *p
** was created.
*/
u32 sqlite3BitvecSize(Bitvec *p){
return p->iSize;
}
#ifndef SQLITE_UNTESTABLE
/*
** Let V[] be an array of unsigned characters sufficient to hold
** up to N bits. Let I be an integer between 0 and N. 0<=I<N.
** Then the following macros can be used to set, clear, or test
** individual bits within V.
*/
#define SETBIT(V,I) V[I>>3] |= (1<<(I&7))
#define CLEARBIT(V,I) V[I>>3] &= ~(1<<(I&7))
#define TESTBIT(V,I) (V[I>>3]&(1<<(I&7)))!=0
/*
** This routine runs an extensive test of the Bitvec code.
**
** The input is an array of integers that acts as a program
** to test the Bitvec. The integers are opcodes followed
** by 0, 1, or 3 operands, depending on the opcode. Another
** opcode follows immediately after the last operand.
**
** There are 6 opcodes numbered from 0 through 5. 0 is the
** "halt" opcode and causes the test to end.
**
** 0 Halt and return the number of errors
** 1 N S X Set N bits beginning with S and incrementing by X
** 2 N S X Clear N bits beginning with S and incrementing by X
** 3 N Set N randomly chosen bits
** 4 N Clear N randomly chosen bits
** 5 N S X Set N bits from S increment X in array only, not in bitvec
**
** The opcodes 1 through 4 perform set and clear operations are performed
** on both a Bitvec object and on a linear array of bits obtained from malloc.
** Opcode 5 works on the linear array only, not on the Bitvec.
** Opcode 5 is used to deliberately induce a fault in order to
** confirm that error detection works.
**
** At the conclusion of the test the linear array is compared
** against the Bitvec object. If there are any differences,
** an error is returned. If they are the same, zero is returned.
**
** If a memory allocation error occurs, return -1.
*/
int sqlite3BitvecBuiltinTest(int sz, int *aOp){
Bitvec *pBitvec = 0;
unsigned char *pV = 0;
int rc = -1;
int i, nx, pc, op;
void *pTmpSpace;
/* Allocate the Bitvec to be tested and a linear array of
** bits to act as the reference */
pBitvec = sqlite3BitvecCreate( sz );
pV = sqlite3MallocZero( (sz+7)/8 + 1 );
pTmpSpace = sqlite3_malloc64(BITVEC_SZ);
if( pBitvec==0 || pV==0 || pTmpSpace==0 ) goto bitvec_end;
/* NULL pBitvec tests */
sqlite3BitvecSet(0, 1);
sqlite3BitvecClear(0, 1, pTmpSpace);
/* Run the program */
pc = i = 0;
while( (op = aOp[pc])!=0 ){
switch( op ){
case 1:
case 2:
case 5: {
nx = 4;
i = aOp[pc+2] - 1;
aOp[pc+2] += aOp[pc+3];
break;
}
case 3:
case 4:
default: {
nx = 2;
sqlite3_randomness(sizeof(i), &i);
break;
}
}
if( (--aOp[pc+1]) > 0 ) nx = 0;
pc += nx;
i = (i & 0x7fffffff)%sz;
if( (op & 1)!=0 ){
SETBIT(pV, (i+1));
if( op!=5 ){
if( sqlite3BitvecSet(pBitvec, i+1) ) goto bitvec_end;
}
}else{
CLEARBIT(pV, (i+1));
sqlite3BitvecClear(pBitvec, i+1, pTmpSpace);
}
}
/* Test to make sure the linear array exactly matches the
** Bitvec object. Start with the assumption that they do
** match (rc==0). Change rc to non-zero if a discrepancy
** is found.
*/
rc = sqlite3BitvecTest(0,0) + sqlite3BitvecTest(pBitvec, sz+1)
+ sqlite3BitvecTest(pBitvec, 0)
+ (sqlite3BitvecSize(pBitvec) - sz);
for(i=1; i<=sz; i++){
if( (TESTBIT(pV,i))!=sqlite3BitvecTest(pBitvec,i) ){
rc = i;
break;
}
}
/* Free allocated structure */
bitvec_end:
sqlite3_free(pTmpSpace);
sqlite3_free(pV);
sqlite3BitvecDestroy(pBitvec);
return rc;
}
#endif /* SQLITE_UNTESTABLE */
| 13,239 | 412 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/shathree.c | /*
** 2017-03-08
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This SQLite extension implements functions that compute SHA3 hashes.
** Two SQL functions are implemented:
**
** sha3(X,SIZE)
** sha3_query(Y,SIZE)
**
** The sha3(X) function computes the SHA3 hash of the input X, or NULL if
** X is NULL.
**
** The sha3_query(Y) function evalutes all queries in the SQL statements of Y
** and returns a hash of their results.
**
** The SIZE argument is optional. If omitted, the SHA3-256 hash algorithm
** is used. If SIZE is included it must be one of the integers 224, 256,
** 384, or 512, to determine SHA3 hash variant that is computed.
*/
#include "libc/assert.h"
#include "libc/str/str.h"
#include "third_party/sqlite3/sqlite3ext.h"
// clang-format off
SQLITE_EXTENSION_INIT1
typedef sqlite3_uint64 u64;
/******************************************************************************
** The Hash Engine
*/
/*
** Macros to determine whether the machine is big or little endian,
** and whether or not that determination is run-time or compile-time.
**
** For best performance, an attempt is made to guess at the byte-order
** using C-preprocessor macros. If that is unsuccessful, or if
** -DSHA3_BYTEORDER=0 is set, then byte-order is determined
** at run-time.
*/
#ifndef SHA3_BYTEORDER
# if defined(i386) || defined(__i386__) || defined(_M_IX86) || \
defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) || \
defined(_M_AMD64) || defined(_M_ARM) || defined(__x86) || \
defined(__arm__)
# define SHA3_BYTEORDER 1234
# elif defined(sparc) || defined(__ppc__)
# define SHA3_BYTEORDER 4321
# else
# define SHA3_BYTEORDER 0
# endif
#endif
/*
** State structure for a SHA3 hash in progress
*/
typedef struct SHA3Context SHA3Context;
struct SHA3Context {
union {
u64 s[25]; /* Keccak state. 5x5 lines of 64 bits each */
unsigned char x[1600]; /* ... or 1600 bytes */
} u;
unsigned nRate; /* Bytes of input accepted per Keccak iteration */
unsigned nLoaded; /* Input bytes loaded into u.x[] so far this cycle */
unsigned ixMask; /* Insert next input into u.x[nLoaded^ixMask]. */
};
/*
** A single step of the Keccak mixing function for a 1600-bit state
*/
static void KeccakF1600Step(SHA3Context *p){
int i;
u64 b0, b1, b2, b3, b4;
u64 c0, c1, c2, c3, c4;
u64 d0, d1, d2, d3, d4;
static const u64 RC[] = {
0x0000000000000001ULL, 0x0000000000008082ULL,
0x800000000000808aULL, 0x8000000080008000ULL,
0x000000000000808bULL, 0x0000000080000001ULL,
0x8000000080008081ULL, 0x8000000000008009ULL,
0x000000000000008aULL, 0x0000000000000088ULL,
0x0000000080008009ULL, 0x000000008000000aULL,
0x000000008000808bULL, 0x800000000000008bULL,
0x8000000000008089ULL, 0x8000000000008003ULL,
0x8000000000008002ULL, 0x8000000000000080ULL,
0x000000000000800aULL, 0x800000008000000aULL,
0x8000000080008081ULL, 0x8000000000008080ULL,
0x0000000080000001ULL, 0x8000000080008008ULL
};
# define a00 (p->u.s[0])
# define a01 (p->u.s[1])
# define a02 (p->u.s[2])
# define a03 (p->u.s[3])
# define a04 (p->u.s[4])
# define a10 (p->u.s[5])
# define a11 (p->u.s[6])
# define a12 (p->u.s[7])
# define a13 (p->u.s[8])
# define a14 (p->u.s[9])
# define a20 (p->u.s[10])
# define a21 (p->u.s[11])
# define a22 (p->u.s[12])
# define a23 (p->u.s[13])
# define a24 (p->u.s[14])
# define a30 (p->u.s[15])
# define a31 (p->u.s[16])
# define a32 (p->u.s[17])
# define a33 (p->u.s[18])
# define a34 (p->u.s[19])
# define a40 (p->u.s[20])
# define a41 (p->u.s[21])
# define a42 (p->u.s[22])
# define a43 (p->u.s[23])
# define a44 (p->u.s[24])
# define ROL64(a,x) ((a<<x)|(a>>(64-x)))
for(i=0; i<24; i+=4){
c0 = a00^a10^a20^a30^a40;
c1 = a01^a11^a21^a31^a41;
c2 = a02^a12^a22^a32^a42;
c3 = a03^a13^a23^a33^a43;
c4 = a04^a14^a24^a34^a44;
d0 = c4^ROL64(c1, 1);
d1 = c0^ROL64(c2, 1);
d2 = c1^ROL64(c3, 1);
d3 = c2^ROL64(c4, 1);
d4 = c3^ROL64(c0, 1);
b0 = (a00^d0);
b1 = ROL64((a11^d1), 44);
b2 = ROL64((a22^d2), 43);
b3 = ROL64((a33^d3), 21);
b4 = ROL64((a44^d4), 14);
a00 = b0 ^((~b1)& b2 );
a00 ^= RC[i];
a11 = b1 ^((~b2)& b3 );
a22 = b2 ^((~b3)& b4 );
a33 = b3 ^((~b4)& b0 );
a44 = b4 ^((~b0)& b1 );
b2 = ROL64((a20^d0), 3);
b3 = ROL64((a31^d1), 45);
b4 = ROL64((a42^d2), 61);
b0 = ROL64((a03^d3), 28);
b1 = ROL64((a14^d4), 20);
a20 = b0 ^((~b1)& b2 );
a31 = b1 ^((~b2)& b3 );
a42 = b2 ^((~b3)& b4 );
a03 = b3 ^((~b4)& b0 );
a14 = b4 ^((~b0)& b1 );
b4 = ROL64((a40^d0), 18);
b0 = ROL64((a01^d1), 1);
b1 = ROL64((a12^d2), 6);
b2 = ROL64((a23^d3), 25);
b3 = ROL64((a34^d4), 8);
a40 = b0 ^((~b1)& b2 );
a01 = b1 ^((~b2)& b3 );
a12 = b2 ^((~b3)& b4 );
a23 = b3 ^((~b4)& b0 );
a34 = b4 ^((~b0)& b1 );
b1 = ROL64((a10^d0), 36);
b2 = ROL64((a21^d1), 10);
b3 = ROL64((a32^d2), 15);
b4 = ROL64((a43^d3), 56);
b0 = ROL64((a04^d4), 27);
a10 = b0 ^((~b1)& b2 );
a21 = b1 ^((~b2)& b3 );
a32 = b2 ^((~b3)& b4 );
a43 = b3 ^((~b4)& b0 );
a04 = b4 ^((~b0)& b1 );
b3 = ROL64((a30^d0), 41);
b4 = ROL64((a41^d1), 2);
b0 = ROL64((a02^d2), 62);
b1 = ROL64((a13^d3), 55);
b2 = ROL64((a24^d4), 39);
a30 = b0 ^((~b1)& b2 );
a41 = b1 ^((~b2)& b3 );
a02 = b2 ^((~b3)& b4 );
a13 = b3 ^((~b4)& b0 );
a24 = b4 ^((~b0)& b1 );
c0 = a00^a20^a40^a10^a30;
c1 = a11^a31^a01^a21^a41;
c2 = a22^a42^a12^a32^a02;
c3 = a33^a03^a23^a43^a13;
c4 = a44^a14^a34^a04^a24;
d0 = c4^ROL64(c1, 1);
d1 = c0^ROL64(c2, 1);
d2 = c1^ROL64(c3, 1);
d3 = c2^ROL64(c4, 1);
d4 = c3^ROL64(c0, 1);
b0 = (a00^d0);
b1 = ROL64((a31^d1), 44);
b2 = ROL64((a12^d2), 43);
b3 = ROL64((a43^d3), 21);
b4 = ROL64((a24^d4), 14);
a00 = b0 ^((~b1)& b2 );
a00 ^= RC[i+1];
a31 = b1 ^((~b2)& b3 );
a12 = b2 ^((~b3)& b4 );
a43 = b3 ^((~b4)& b0 );
a24 = b4 ^((~b0)& b1 );
b2 = ROL64((a40^d0), 3);
b3 = ROL64((a21^d1), 45);
b4 = ROL64((a02^d2), 61);
b0 = ROL64((a33^d3), 28);
b1 = ROL64((a14^d4), 20);
a40 = b0 ^((~b1)& b2 );
a21 = b1 ^((~b2)& b3 );
a02 = b2 ^((~b3)& b4 );
a33 = b3 ^((~b4)& b0 );
a14 = b4 ^((~b0)& b1 );
b4 = ROL64((a30^d0), 18);
b0 = ROL64((a11^d1), 1);
b1 = ROL64((a42^d2), 6);
b2 = ROL64((a23^d3), 25);
b3 = ROL64((a04^d4), 8);
a30 = b0 ^((~b1)& b2 );
a11 = b1 ^((~b2)& b3 );
a42 = b2 ^((~b3)& b4 );
a23 = b3 ^((~b4)& b0 );
a04 = b4 ^((~b0)& b1 );
b1 = ROL64((a20^d0), 36);
b2 = ROL64((a01^d1), 10);
b3 = ROL64((a32^d2), 15);
b4 = ROL64((a13^d3), 56);
b0 = ROL64((a44^d4), 27);
a20 = b0 ^((~b1)& b2 );
a01 = b1 ^((~b2)& b3 );
a32 = b2 ^((~b3)& b4 );
a13 = b3 ^((~b4)& b0 );
a44 = b4 ^((~b0)& b1 );
b3 = ROL64((a10^d0), 41);
b4 = ROL64((a41^d1), 2);
b0 = ROL64((a22^d2), 62);
b1 = ROL64((a03^d3), 55);
b2 = ROL64((a34^d4), 39);
a10 = b0 ^((~b1)& b2 );
a41 = b1 ^((~b2)& b3 );
a22 = b2 ^((~b3)& b4 );
a03 = b3 ^((~b4)& b0 );
a34 = b4 ^((~b0)& b1 );
c0 = a00^a40^a30^a20^a10;
c1 = a31^a21^a11^a01^a41;
c2 = a12^a02^a42^a32^a22;
c3 = a43^a33^a23^a13^a03;
c4 = a24^a14^a04^a44^a34;
d0 = c4^ROL64(c1, 1);
d1 = c0^ROL64(c2, 1);
d2 = c1^ROL64(c3, 1);
d3 = c2^ROL64(c4, 1);
d4 = c3^ROL64(c0, 1);
b0 = (a00^d0);
b1 = ROL64((a21^d1), 44);
b2 = ROL64((a42^d2), 43);
b3 = ROL64((a13^d3), 21);
b4 = ROL64((a34^d4), 14);
a00 = b0 ^((~b1)& b2 );
a00 ^= RC[i+2];
a21 = b1 ^((~b2)& b3 );
a42 = b2 ^((~b3)& b4 );
a13 = b3 ^((~b4)& b0 );
a34 = b4 ^((~b0)& b1 );
b2 = ROL64((a30^d0), 3);
b3 = ROL64((a01^d1), 45);
b4 = ROL64((a22^d2), 61);
b0 = ROL64((a43^d3), 28);
b1 = ROL64((a14^d4), 20);
a30 = b0 ^((~b1)& b2 );
a01 = b1 ^((~b2)& b3 );
a22 = b2 ^((~b3)& b4 );
a43 = b3 ^((~b4)& b0 );
a14 = b4 ^((~b0)& b1 );
b4 = ROL64((a10^d0), 18);
b0 = ROL64((a31^d1), 1);
b1 = ROL64((a02^d2), 6);
b2 = ROL64((a23^d3), 25);
b3 = ROL64((a44^d4), 8);
a10 = b0 ^((~b1)& b2 );
a31 = b1 ^((~b2)& b3 );
a02 = b2 ^((~b3)& b4 );
a23 = b3 ^((~b4)& b0 );
a44 = b4 ^((~b0)& b1 );
b1 = ROL64((a40^d0), 36);
b2 = ROL64((a11^d1), 10);
b3 = ROL64((a32^d2), 15);
b4 = ROL64((a03^d3), 56);
b0 = ROL64((a24^d4), 27);
a40 = b0 ^((~b1)& b2 );
a11 = b1 ^((~b2)& b3 );
a32 = b2 ^((~b3)& b4 );
a03 = b3 ^((~b4)& b0 );
a24 = b4 ^((~b0)& b1 );
b3 = ROL64((a20^d0), 41);
b4 = ROL64((a41^d1), 2);
b0 = ROL64((a12^d2), 62);
b1 = ROL64((a33^d3), 55);
b2 = ROL64((a04^d4), 39);
a20 = b0 ^((~b1)& b2 );
a41 = b1 ^((~b2)& b3 );
a12 = b2 ^((~b3)& b4 );
a33 = b3 ^((~b4)& b0 );
a04 = b4 ^((~b0)& b1 );
c0 = a00^a30^a10^a40^a20;
c1 = a21^a01^a31^a11^a41;
c2 = a42^a22^a02^a32^a12;
c3 = a13^a43^a23^a03^a33;
c4 = a34^a14^a44^a24^a04;
d0 = c4^ROL64(c1, 1);
d1 = c0^ROL64(c2, 1);
d2 = c1^ROL64(c3, 1);
d3 = c2^ROL64(c4, 1);
d4 = c3^ROL64(c0, 1);
b0 = (a00^d0);
b1 = ROL64((a01^d1), 44);
b2 = ROL64((a02^d2), 43);
b3 = ROL64((a03^d3), 21);
b4 = ROL64((a04^d4), 14);
a00 = b0 ^((~b1)& b2 );
a00 ^= RC[i+3];
a01 = b1 ^((~b2)& b3 );
a02 = b2 ^((~b3)& b4 );
a03 = b3 ^((~b4)& b0 );
a04 = b4 ^((~b0)& b1 );
b2 = ROL64((a10^d0), 3);
b3 = ROL64((a11^d1), 45);
b4 = ROL64((a12^d2), 61);
b0 = ROL64((a13^d3), 28);
b1 = ROL64((a14^d4), 20);
a10 = b0 ^((~b1)& b2 );
a11 = b1 ^((~b2)& b3 );
a12 = b2 ^((~b3)& b4 );
a13 = b3 ^((~b4)& b0 );
a14 = b4 ^((~b0)& b1 );
b4 = ROL64((a20^d0), 18);
b0 = ROL64((a21^d1), 1);
b1 = ROL64((a22^d2), 6);
b2 = ROL64((a23^d3), 25);
b3 = ROL64((a24^d4), 8);
a20 = b0 ^((~b1)& b2 );
a21 = b1 ^((~b2)& b3 );
a22 = b2 ^((~b3)& b4 );
a23 = b3 ^((~b4)& b0 );
a24 = b4 ^((~b0)& b1 );
b1 = ROL64((a30^d0), 36);
b2 = ROL64((a31^d1), 10);
b3 = ROL64((a32^d2), 15);
b4 = ROL64((a33^d3), 56);
b0 = ROL64((a34^d4), 27);
a30 = b0 ^((~b1)& b2 );
a31 = b1 ^((~b2)& b3 );
a32 = b2 ^((~b3)& b4 );
a33 = b3 ^((~b4)& b0 );
a34 = b4 ^((~b0)& b1 );
b3 = ROL64((a40^d0), 41);
b4 = ROL64((a41^d1), 2);
b0 = ROL64((a42^d2), 62);
b1 = ROL64((a43^d3), 55);
b2 = ROL64((a44^d4), 39);
a40 = b0 ^((~b1)& b2 );
a41 = b1 ^((~b2)& b3 );
a42 = b2 ^((~b3)& b4 );
a43 = b3 ^((~b4)& b0 );
a44 = b4 ^((~b0)& b1 );
}
}
/*
** Initialize a new hash. iSize determines the size of the hash
** in bits and should be one of 224, 256, 384, or 512. Or iSize
** can be zero to use the default hash size of 256 bits.
*/
static void SHA3Init(SHA3Context *p, int iSize){
memset(p, 0, sizeof(*p));
if( iSize>=128 && iSize<=512 ){
p->nRate = (1600 - ((iSize + 31)&~31)*2)/8;
}else{
p->nRate = (1600 - 2*256)/8;
}
#if SHA3_BYTEORDER==1234
/* Known to be little-endian at compile-time. No-op */
#elif SHA3_BYTEORDER==4321
p->ixMask = 7; /* Big-endian */
#else
{
static unsigned int one = 1;
if( 1==*(unsigned char*)&one ){
/* Little endian. No byte swapping. */
p->ixMask = 0;
}else{
/* Big endian. Byte swap. */
p->ixMask = 7;
}
}
#endif
}
/*
** Make consecutive calls to the SHA3Update function to add new content
** to the hash
*/
static void SHA3Update(
SHA3Context *p,
const unsigned char *aData,
unsigned int nData
){
unsigned int i = 0;
#if SHA3_BYTEORDER==1234
if( (p->nLoaded % 8)==0 && ((aData - (const unsigned char*)0)&7)==0 ){
for(; i+7<nData; i+=8){
p->u.s[p->nLoaded/8] ^= *(u64*)&aData[i];
p->nLoaded += 8;
if( p->nLoaded>=p->nRate ){
KeccakF1600Step(p);
p->nLoaded = 0;
}
}
}
#endif
for(; i<nData; i++){
#if SHA3_BYTEORDER==1234
p->u.x[p->nLoaded] ^= aData[i];
#elif SHA3_BYTEORDER==4321
p->u.x[p->nLoaded^0x07] ^= aData[i];
#else
p->u.x[p->nLoaded^p->ixMask] ^= aData[i];
#endif
p->nLoaded++;
if( p->nLoaded==p->nRate ){
KeccakF1600Step(p);
p->nLoaded = 0;
}
}
}
/*
** After all content has been added, invoke SHA3Final() to compute
** the final hash. The function returns a pointer to the binary
** hash value.
*/
static unsigned char *SHA3Final(SHA3Context *p){
unsigned int i;
if( p->nLoaded==p->nRate-1 ){
const unsigned char c1 = 0x86;
SHA3Update(p, &c1, 1);
}else{
const unsigned char c2 = 0x06;
const unsigned char c3 = 0x80;
SHA3Update(p, &c2, 1);
p->nLoaded = p->nRate - 1;
SHA3Update(p, &c3, 1);
}
for(i=0; i<p->nRate; i++){
p->u.x[i+p->nRate] = p->u.x[i^p->ixMask];
}
return &p->u.x[p->nRate];
}
/* End of the hashing logic
*****************************************************************************/
/*
** Implementation of the sha3(X,SIZE) function.
**
** Return a BLOB which is the SIZE-bit SHA3 hash of X. The default
** size is 256. If X is a BLOB, it is hashed as is.
** For all other non-NULL types of input, X is converted into a UTF-8 string
** and the string is hashed without the trailing 0x00 terminator. The hash
** of a NULL value is NULL.
*/
static void sha3Func(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
SHA3Context cx;
int eType = sqlite3_value_type(argv[0]);
int nByte = sqlite3_value_bytes(argv[0]);
int iSize;
if( argc==1 ){
iSize = 256;
}else{
iSize = sqlite3_value_int(argv[1]);
if( iSize!=224 && iSize!=256 && iSize!=384 && iSize!=512 ){
sqlite3_result_error(context, "SHA3 size should be one of: 224 256 "
"384 512", -1);
return;
}
}
if( eType==SQLITE_NULL ) return;
SHA3Init(&cx, iSize);
if( eType==SQLITE_BLOB ){
SHA3Update(&cx, sqlite3_value_blob(argv[0]), nByte);
}else{
SHA3Update(&cx, sqlite3_value_text(argv[0]), nByte);
}
sqlite3_result_blob(context, SHA3Final(&cx), iSize/8, SQLITE_TRANSIENT);
}
/* Compute a string using sqlite3_vsnprintf() with a maximum length
** of 50 bytes and add it to the hash.
*/
static void hash_step_vformat(
SHA3Context *p, /* Add content to this context */
const char *zFormat,
...
){
va_list ap;
int n;
char zBuf[50];
va_start(ap, zFormat);
sqlite3_vsnprintf(sizeof(zBuf),zBuf,zFormat,ap);
va_end(ap);
n = (int)strlen(zBuf);
SHA3Update(p, (unsigned char*)zBuf, n);
}
/*
** Implementation of the sha3_query(SQL,SIZE) function.
**
** This function compiles and runs the SQL statement(s) given in the
** argument. The results are hashed using a SIZE-bit SHA3. The default
** size is 256.
**
** The format of the byte stream that is hashed is summarized as follows:
**
** S<n>:<sql>
** R
** N
** I<int>
** F<ieee-float>
** B<size>:<bytes>
** T<size>:<text>
**
** <sql> is the original SQL text for each statement run and <n> is
** the size of that text. The SQL text is UTF-8. A single R character
** occurs before the start of each row. N means a NULL value.
** I mean an 8-byte little-endian integer <int>. F is a floating point
** number with an 8-byte little-endian IEEE floating point value <ieee-float>.
** B means blobs of <size> bytes. T means text rendered as <size>
** bytes of UTF-8. The <n> and <size> values are expressed as an ASCII
** text integers.
**
** For each SQL statement in the X input, there is one S segment. Each
** S segment is followed by zero or more R segments, one for each row in the
** result set. After each R, there are one or more N, I, F, B, or T segments,
** one for each column in the result set. Segments are concatentated directly
** with no delimiters of any kind.
*/
static void sha3QueryFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
sqlite3 *db = sqlite3_context_db_handle(context);
const char *zSql = (const char*)sqlite3_value_text(argv[0]);
sqlite3_stmt *pStmt = 0;
int nCol; /* Number of columns in the result set */
int i; /* Loop counter */
int rc;
int n;
const char *z;
SHA3Context cx;
int iSize;
if( argc==1 ){
iSize = 256;
}else{
iSize = sqlite3_value_int(argv[1]);
if( iSize!=224 && iSize!=256 && iSize!=384 && iSize!=512 ){
sqlite3_result_error(context, "SHA3 size should be one of: 224 256 "
"384 512", -1);
return;
}
}
if( zSql==0 ) return;
SHA3Init(&cx, iSize);
while( zSql[0] ){
rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, &zSql);
if( rc ){
char *zMsg = sqlite3_mprintf("error SQL statement [%s]: %s",
zSql, sqlite3_errmsg(db));
sqlite3_finalize(pStmt);
sqlite3_result_error(context, zMsg, -1);
sqlite3_free(zMsg);
return;
}
if( !sqlite3_stmt_readonly(pStmt) ){
char *zMsg = sqlite3_mprintf("non-query: [%s]", sqlite3_sql(pStmt));
sqlite3_finalize(pStmt);
sqlite3_result_error(context, zMsg, -1);
sqlite3_free(zMsg);
return;
}
nCol = sqlite3_column_count(pStmt);
z = sqlite3_sql(pStmt);
if( z ){
n = (int)strlen(z);
hash_step_vformat(&cx,"S%d:",n);
SHA3Update(&cx,(unsigned char*)z,n);
}
/* Compute a hash over the result of the query */
while( SQLITE_ROW==sqlite3_step(pStmt) ){
SHA3Update(&cx,(const unsigned char*)"R",1);
for(i=0; i<nCol; i++){
switch( sqlite3_column_type(pStmt,i) ){
case SQLITE_NULL: {
SHA3Update(&cx, (const unsigned char*)"N",1);
break;
}
case SQLITE_INTEGER: {
sqlite3_uint64 u;
int j;
unsigned char x[9];
sqlite3_int64 v = sqlite3_column_int64(pStmt,i);
memcpy(&u, &v, 8);
for(j=8; j>=1; j--){
x[j] = u & 0xff;
u >>= 8;
}
x[0] = 'I';
SHA3Update(&cx, x, 9);
break;
}
case SQLITE_FLOAT: {
sqlite3_uint64 u;
int j;
unsigned char x[9];
double r = sqlite3_column_double(pStmt,i);
memcpy(&u, &r, 8);
for(j=8; j>=1; j--){
x[j] = u & 0xff;
u >>= 8;
}
x[0] = 'F';
SHA3Update(&cx,x,9);
break;
}
case SQLITE_TEXT: {
int n2 = sqlite3_column_bytes(pStmt, i);
const unsigned char *z2 = sqlite3_column_text(pStmt, i);
hash_step_vformat(&cx,"T%d:",n2);
SHA3Update(&cx, z2, n2);
break;
}
case SQLITE_BLOB: {
int n2 = sqlite3_column_bytes(pStmt, i);
const unsigned char *z2 = sqlite3_column_blob(pStmt, i);
hash_step_vformat(&cx,"B%d:",n2);
SHA3Update(&cx, z2, n2);
break;
}
}
}
}
sqlite3_finalize(pStmt);
}
sqlite3_result_blob(context, SHA3Final(&cx), iSize/8, SQLITE_TRANSIENT);
}
int sqlite3_shathree_init(
sqlite3 *db,
char **pzErrMsg,
const sqlite3_api_routines *pApi
){
int rc = SQLITE_OK;
SQLITE_EXTENSION_INIT2(pApi);
(void)pzErrMsg; /* Unused parameter */
rc = sqlite3_create_function(db, "sha3", 1,
SQLITE_UTF8 | SQLITE_INNOCUOUS | SQLITE_DETERMINISTIC,
0, sha3Func, 0, 0);
if( rc==SQLITE_OK ){
rc = sqlite3_create_function(db, "sha3", 2,
SQLITE_UTF8 | SQLITE_INNOCUOUS | SQLITE_DETERMINISTIC,
0, sha3Func, 0, 0);
}
if( rc==SQLITE_OK ){
rc = sqlite3_create_function(db, "sha3_query", 1,
SQLITE_UTF8 | SQLITE_DIRECTONLY,
0, sha3QueryFunc, 0, 0);
}
if( rc==SQLITE_OK ){
rc = sqlite3_create_function(db, "sha3_query", 2,
SQLITE_UTF8 | SQLITE_DIRECTONLY,
0, sha3QueryFunc, 0, 0);
}
return rc;
}
| 20,831 | 718 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/decimal.shell.c | #include "third_party/sqlite3/decimal.c"
| 41 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/btree.shell.c | #include "third_party/sqlite3/btree.c"
| 39 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_tokenizer.shell.c | #include "third_party/sqlite3/fts3_tokenizer.c"
| 48 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/wal.c | /*
** 2010 February 1
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains the implementation of a write-ahead log (WAL) used in
** "journal_mode=WAL" mode.
**
** WRITE-AHEAD LOG (WAL) FILE FORMAT
**
** A WAL file consists of a header followed by zero or more "frames".
** Each frame records the revised content of a single page from the
** database file. All changes to the database are recorded by writing
** frames into the WAL. Transactions commit when a frame is written that
** contains a commit marker. A single WAL can and usually does record
** multiple transactions. Periodically, the content of the WAL is
** transferred back into the database file in an operation called a
** "checkpoint".
**
** A single WAL file can be used multiple times. In other words, the
** WAL can fill up with frames and then be checkpointed and then new
** frames can overwrite the old ones. A WAL always grows from beginning
** toward the end. Checksums and counters attached to each frame are
** used to determine which frames within the WAL are valid and which
** are leftovers from prior checkpoints.
**
** The WAL header is 32 bytes in size and consists of the following eight
** big-endian 32-bit unsigned integer values:
**
** 0: Magic number. 0x377f0682 or 0x377f0683
** 4: File format version. Currently 3007000
** 8: Database page size. Example: 1024
** 12: Checkpoint sequence number
** 16: Salt-1, random integer incremented with each checkpoint
** 20: Salt-2, a different random integer changing with each ckpt
** 24: Checksum-1 (first part of checksum for first 24 bytes of header).
** 28: Checksum-2 (second part of checksum for first 24 bytes of header).
**
** Immediately following the wal-header are zero or more frames. Each
** frame consists of a 24-byte frame-header followed by a <page-size> bytes
** of page data. The frame-header is six big-endian 32-bit unsigned
** integer values, as follows:
**
** 0: Page number.
** 4: For commit records, the size of the database image in pages
** after the commit. For all other records, zero.
** 8: Salt-1 (copied from the header)
** 12: Salt-2 (copied from the header)
** 16: Checksum-1.
** 20: Checksum-2.
**
** A frame is considered valid if and only if the following conditions are
** true:
**
** (1) The salt-1 and salt-2 values in the frame-header match
** salt values in the wal-header
**
** (2) The checksum values in the final 8 bytes of the frame-header
** exactly match the checksum computed consecutively on the
** WAL header and the first 8 bytes and the content of all frames
** up to and including the current frame.
**
** The checksum is computed using 32-bit big-endian integers if the
** magic number in the first 4 bytes of the WAL is 0x377f0683 and it
** is computed using little-endian if the magic number is 0x377f0682.
** The checksum values are always stored in the frame header in a
** big-endian format regardless of which byte order is used to compute
** the checksum. The checksum is computed by interpreting the input as
** an even number of unsigned 32-bit integers: x[0] through x[N]. The
** algorithm used for the checksum is as follows:
**
** for i from 0 to n-1 step 2:
** s0 += x[i] + s1;
** s1 += x[i+1] + s0;
** endfor
**
** Note that s0 and s1 are both weighted checksums using fibonacci weights
** in reverse order (the largest fibonacci weight occurs on the first element
** of the sequence being summed.) The s1 value spans all 32-bit
** terms of the sequence whereas s0 omits the final term.
**
** On a checkpoint, the WAL is first VFS.xSync-ed, then valid content of the
** WAL is transferred into the database, then the database is VFS.xSync-ed.
** The VFS.xSync operations serve as write barriers - all writes launched
** before the xSync must complete before any write that launches after the
** xSync begins.
**
** After each checkpoint, the salt-1 value is incremented and the salt-2
** value is randomized. This prevents old and new frames in the WAL from
** being considered valid at the same time and being checkpointing together
** following a crash.
**
** READER ALGORITHM
**
** To read a page from the database (call it page number P), a reader
** first checks the WAL to see if it contains page P. If so, then the
** last valid instance of page P that is a followed by a commit frame
** or is a commit frame itself becomes the value read. If the WAL
** contains no copies of page P that are valid and which are a commit
** frame or are followed by a commit frame, then page P is read from
** the database file.
**
** To start a read transaction, the reader records the index of the last
** valid frame in the WAL. The reader uses this recorded "mxFrame" value
** for all subsequent read operations. New transactions can be appended
** to the WAL, but as long as the reader uses its original mxFrame value
** and ignores the newly appended content, it will see a consistent snapshot
** of the database from a single point in time. This technique allows
** multiple concurrent readers to view different versions of the database
** content simultaneously.
**
** The reader algorithm in the previous paragraphs works correctly, but
** because frames for page P can appear anywhere within the WAL, the
** reader has to scan the entire WAL looking for page P frames. If the
** WAL is large (multiple megabytes is typical) that scan can be slow,
** and read performance suffers. To overcome this problem, a separate
** data structure called the wal-index is maintained to expedite the
** search for frames of a particular page.
**
** WAL-INDEX FORMAT
**
** Conceptually, the wal-index is shared memory, though VFS implementations
** might choose to implement the wal-index using a mmapped file. Because
** the wal-index is shared memory, SQLite does not support journal_mode=WAL
** on a network filesystem. All users of the database must be able to
** share memory.
**
** In the default unix and windows implementation, the wal-index is a mmapped
** file whose name is the database name with a "-shm" suffix added. For that
** reason, the wal-index is sometimes called the "shm" file.
**
** The wal-index is transient. After a crash, the wal-index can (and should
** be) reconstructed from the original WAL file. In fact, the VFS is required
** to either truncate or zero the header of the wal-index when the last
** connection to it closes. Because the wal-index is transient, it can
** use an architecture-specific format; it does not have to be cross-platform.
** Hence, unlike the database and WAL file formats which store all values
** as big endian, the wal-index can store multi-byte values in the native
** byte order of the host computer.
**
** The purpose of the wal-index is to answer this question quickly: Given
** a page number P and a maximum frame index M, return the index of the
** last frame in the wal before frame M for page P in the WAL, or return
** NULL if there are no frames for page P in the WAL prior to M.
**
** The wal-index consists of a header region, followed by an one or
** more index blocks.
**
** The wal-index header contains the total number of frames within the WAL
** in the mxFrame field.
**
** Each index block except for the first contains information on
** HASHTABLE_NPAGE frames. The first index block contains information on
** HASHTABLE_NPAGE_ONE frames. The values of HASHTABLE_NPAGE_ONE and
** HASHTABLE_NPAGE are selected so that together the wal-index header and
** first index block are the same size as all other index blocks in the
** wal-index. The values are:
**
** HASHTABLE_NPAGE 4096
** HASHTABLE_NPAGE_ONE 4062
**
** Each index block contains two sections, a page-mapping that contains the
** database page number associated with each wal frame, and a hash-table
** that allows readers to query an index block for a specific page number.
** The page-mapping is an array of HASHTABLE_NPAGE (or HASHTABLE_NPAGE_ONE
** for the first index block) 32-bit page numbers. The first entry in the
** first index-block contains the database page number corresponding to the
** first frame in the WAL file. The first entry in the second index block
** in the WAL file corresponds to the (HASHTABLE_NPAGE_ONE+1)th frame in
** the log, and so on.
**
** The last index block in a wal-index usually contains less than the full
** complement of HASHTABLE_NPAGE (or HASHTABLE_NPAGE_ONE) page-numbers,
** depending on the contents of the WAL file. This does not change the
** allocated size of the page-mapping array - the page-mapping array merely
** contains unused entries.
**
** Even without using the hash table, the last frame for page P
** can be found by scanning the page-mapping sections of each index block
** starting with the last index block and moving toward the first, and
** within each index block, starting at the end and moving toward the
** beginning. The first entry that equals P corresponds to the frame
** holding the content for that page.
**
** The hash table consists of HASHTABLE_NSLOT 16-bit unsigned integers.
** HASHTABLE_NSLOT = 2*HASHTABLE_NPAGE, and there is one entry in the
** hash table for each page number in the mapping section, so the hash
** table is never more than half full. The expected number of collisions
** prior to finding a match is 1. Each entry of the hash table is an
** 1-based index of an entry in the mapping section of the same
** index block. Let K be the 1-based index of the largest entry in
** the mapping section. (For index blocks other than the last, K will
** always be exactly HASHTABLE_NPAGE (4096) and for the last index block
** K will be (mxFrame%HASHTABLE_NPAGE).) Unused slots of the hash table
** contain a value of 0.
**
** To look for page P in the hash table, first compute a hash iKey on
** P as follows:
**
** iKey = (P * 383) % HASHTABLE_NSLOT
**
** Then start scanning entries of the hash table, starting with iKey
** (wrapping around to the beginning when the end of the hash table is
** reached) until an unused hash slot is found. Let the first unused slot
** be at index iUnused. (iUnused might be less than iKey if there was
** wrap-around.) Because the hash table is never more than half full,
** the search is guaranteed to eventually hit an unused entry. Let
** iMax be the value between iKey and iUnused, closest to iUnused,
** where aHash[iMax]==P. If there is no iMax entry (if there exists
** no hash slot such that aHash[i]==p) then page P is not in the
** current index block. Otherwise the iMax-th mapping entry of the
** current index block corresponds to the last entry that references
** page P.
**
** A hash search begins with the last index block and moves toward the
** first index block, looking for entries corresponding to page P. On
** average, only two or three slots in each index block need to be
** examined in order to either find the last entry for page P, or to
** establish that no such entry exists in the block. Each index block
** holds over 4000 entries. So two or three index blocks are sufficient
** to cover a typical 10 megabyte WAL file, assuming 1K pages. 8 or 10
** comparisons (on average) suffice to either locate a frame in the
** WAL or to establish that the frame does not exist in the WAL. This
** is much faster than scanning the entire 10MB WAL.
**
** Note that entries are added in order of increasing K. Hence, one
** reader might be using some value K0 and a second reader that started
** at a later time (after additional transactions were added to the WAL
** and to the wal-index) might be using a different value K1, where K1>K0.
** Both readers can use the same hash table and mapping section to get
** the correct result. There may be entries in the hash table with
** K>K0 but to the first reader, those entries will appear to be unused
** slots in the hash table and so the first reader will get an answer as
** if no values greater than K0 had ever been inserted into the hash table
** in the first place - which is what reader one wants. Meanwhile, the
** second reader using K1 will see additional values that were inserted
** later, which is exactly what reader two wants.
**
** When a rollback occurs, the value of K is decreased. Hash table entries
** that correspond to frames greater than the new K value are removed
** from the hash table at this point.
*/
#ifndef SQLITE_OMIT_WAL
#include "third_party/sqlite3/wal.h"
/*
** Trace output macros
*/
#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
int sqlite3WalTrace = 0;
# define WALTRACE(X) if(sqlite3WalTrace) sqlite3DebugPrintf X
#else
# define WALTRACE(X)
#endif
/*
** The maximum (and only) versions of the wal and wal-index formats
** that may be interpreted by this version of SQLite.
**
** If a client begins recovering a WAL file and finds that (a) the checksum
** values in the wal-header are correct and (b) the version field is not
** WAL_MAX_VERSION, recovery fails and SQLite returns SQLITE_CANTOPEN.
**
** Similarly, if a client successfully reads a wal-index header (i.e. the
** checksum test is successful) and finds that the version field is not
** WALINDEX_MAX_VERSION, then no read-transaction is opened and SQLite
** returns SQLITE_CANTOPEN.
*/
#define WAL_MAX_VERSION 3007000
#define WALINDEX_MAX_VERSION 3007000
/*
** Index numbers for various locking bytes. WAL_NREADER is the number
** of available reader locks and should be at least 3. The default
** is SQLITE_SHM_NLOCK==8 and WAL_NREADER==5.
**
** Technically, the various VFSes are free to implement these locks however
** they see fit. However, compatibility is encouraged so that VFSes can
** interoperate. The standard implemention used on both unix and windows
** is for the index number to indicate a byte offset into the
** WalCkptInfo.aLock[] array in the wal-index header. In other words, all
** locks are on the shm file. The WALINDEX_LOCK_OFFSET constant (which
** should be 120) is the location in the shm file for the first locking
** byte.
*/
#define WAL_WRITE_LOCK 0
#define WAL_ALL_BUT_WRITE 1
#define WAL_CKPT_LOCK 1
#define WAL_RECOVER_LOCK 2
#define WAL_READ_LOCK(I) (3+(I))
#define WAL_NREADER (SQLITE_SHM_NLOCK-3)
/* Object declarations */
typedef struct WalIndexHdr WalIndexHdr;
typedef struct WalIterator WalIterator;
typedef struct WalCkptInfo WalCkptInfo;
/*
** The following object holds a copy of the wal-index header content.
**
** The actual header in the wal-index consists of two copies of this
** object followed by one instance of the WalCkptInfo object.
** For all versions of SQLite through 3.10.0 and probably beyond,
** the locking bytes (WalCkptInfo.aLock) start at offset 120 and
** the total header size is 136 bytes.
**
** The szPage value can be any power of 2 between 512 and 32768, inclusive.
** Or it can be 1 to represent a 65536-byte page. The latter case was
** added in 3.7.1 when support for 64K pages was added.
*/
struct WalIndexHdr {
u32 iVersion; /* Wal-index version */
u32 unused; /* Unused (padding) field */
u32 iChange; /* Counter incremented each transaction */
u8 isInit; /* 1 when initialized */
u8 bigEndCksum; /* True if checksums in WAL are big-endian */
u16 szPage; /* Database page size in bytes. 1==64K */
u32 mxFrame; /* Index of last valid frame in the WAL */
u32 nPage; /* Size of database in pages */
u32 aFrameCksum[2]; /* Checksum of last frame in log */
u32 aSalt[2]; /* Two salt values copied from WAL header */
u32 aCksum[2]; /* Checksum over all prior fields */
};
/*
** A copy of the following object occurs in the wal-index immediately
** following the second copy of the WalIndexHdr. This object stores
** information used by checkpoint.
**
** nBackfill is the number of frames in the WAL that have been written
** back into the database. (We call the act of moving content from WAL to
** database "backfilling".) The nBackfill number is never greater than
** WalIndexHdr.mxFrame. nBackfill can only be increased by threads
** holding the WAL_CKPT_LOCK lock (which includes a recovery thread).
** However, a WAL_WRITE_LOCK thread can move the value of nBackfill from
** mxFrame back to zero when the WAL is reset.
**
** nBackfillAttempted is the largest value of nBackfill that a checkpoint
** has attempted to achieve. Normally nBackfill==nBackfillAtempted, however
** the nBackfillAttempted is set before any backfilling is done and the
** nBackfill is only set after all backfilling completes. So if a checkpoint
** crashes, nBackfillAttempted might be larger than nBackfill. The
** WalIndexHdr.mxFrame must never be less than nBackfillAttempted.
**
** The aLock[] field is a set of bytes used for locking. These bytes should
** never be read or written.
**
** There is one entry in aReadMark[] for each reader lock. If a reader
** holds read-lock K, then the value in aReadMark[K] is no greater than
** the mxFrame for that reader. The value READMARK_NOT_USED (0xffffffff)
** for any aReadMark[] means that entry is unused. aReadMark[0] is
** a special case; its value is never used and it exists as a place-holder
** to avoid having to offset aReadMark[] indexs by one. Readers holding
** WAL_READ_LOCK(0) always ignore the entire WAL and read all content
** directly from the database.
**
** The value of aReadMark[K] may only be changed by a thread that
** is holding an exclusive lock on WAL_READ_LOCK(K). Thus, the value of
** aReadMark[K] cannot changed while there is a reader is using that mark
** since the reader will be holding a shared lock on WAL_READ_LOCK(K).
**
** The checkpointer may only transfer frames from WAL to database where
** the frame numbers are less than or equal to every aReadMark[] that is
** in use (that is, every aReadMark[j] for which there is a corresponding
** WAL_READ_LOCK(j)). New readers (usually) pick the aReadMark[] with the
** largest value and will increase an unused aReadMark[] to mxFrame if there
** is not already an aReadMark[] equal to mxFrame. The exception to the
** previous sentence is when nBackfill equals mxFrame (meaning that everything
** in the WAL has been backfilled into the database) then new readers
** will choose aReadMark[0] which has value 0 and hence such reader will
** get all their all content directly from the database file and ignore
** the WAL.
**
** Writers normally append new frames to the end of the WAL. However,
** if nBackfill equals mxFrame (meaning that all WAL content has been
** written back into the database) and if no readers are using the WAL
** (in other words, if there are no WAL_READ_LOCK(i) where i>0) then
** the writer will first "reset" the WAL back to the beginning and start
** writing new content beginning at frame 1.
**
** We assume that 32-bit loads are atomic and so no locks are needed in
** order to read from any aReadMark[] entries.
*/
struct WalCkptInfo {
u32 nBackfill; /* Number of WAL frames backfilled into DB */
u32 aReadMark[WAL_NREADER]; /* Reader marks */
u8 aLock[SQLITE_SHM_NLOCK]; /* Reserved space for locks */
u32 nBackfillAttempted; /* WAL frames perhaps written, or maybe not */
u32 notUsed0; /* Available for future enhancements */
};
#define READMARK_NOT_USED 0xffffffff
/*
** This is a schematic view of the complete 136-byte header of the
** wal-index file (also known as the -shm file):
**
** +-----------------------------+
** 0: | iVersion | \
** +-----------------------------+ |
** 4: | (unused padding) | |
** +-----------------------------+ |
** 8: | iChange | |
** +-------+-------+-------------+ |
** 12: | bInit | bBig | szPage | |
** +-------+-------+-------------+ |
** 16: | mxFrame | | First copy of the
** +-----------------------------+ | WalIndexHdr object
** 20: | nPage | |
** +-----------------------------+ |
** 24: | aFrameCksum | |
** | | |
** +-----------------------------+ |
** 32: | aSalt | |
** | | |
** +-----------------------------+ |
** 40: | aCksum | |
** | | /
** +-----------------------------+
** 48: | iVersion | \
** +-----------------------------+ |
** 52: | (unused padding) | |
** +-----------------------------+ |
** 56: | iChange | |
** +-------+-------+-------------+ |
** 60: | bInit | bBig | szPage | |
** +-------+-------+-------------+ | Second copy of the
** 64: | mxFrame | | WalIndexHdr
** +-----------------------------+ |
** 68: | nPage | |
** +-----------------------------+ |
** 72: | aFrameCksum | |
** | | |
** +-----------------------------+ |
** 80: | aSalt | |
** | | |
** +-----------------------------+ |
** 88: | aCksum | |
** | | /
** +-----------------------------+
** 96: | nBackfill |
** +-----------------------------+
** 100: | 5 read marks |
** | |
** | |
** | |
** | |
** +-------+-------+------+------+
** 120: | Write | Ckpt | Rcvr | Rd0 | \
** +-------+-------+------+------+ ) 8 lock bytes
** | Read1 | Read2 | Rd3 | Rd4 | /
** +-------+-------+------+------+
** 128: | nBackfillAttempted |
** +-----------------------------+
** 132: | (unused padding) |
** +-----------------------------+
*/
/* A block of WALINDEX_LOCK_RESERVED bytes beginning at
** WALINDEX_LOCK_OFFSET is reserved for locks. Since some systems
** only support mandatory file-locks, we do not read or write data
** from the region of the file on which locks are applied.
*/
#define WALINDEX_LOCK_OFFSET (sizeof(WalIndexHdr)*2+offsetof(WalCkptInfo,aLock))
#define WALINDEX_HDR_SIZE (sizeof(WalIndexHdr)*2+sizeof(WalCkptInfo))
/* Size of header before each frame in wal */
#define WAL_FRAME_HDRSIZE 24
/* Size of write ahead log header, including checksum. */
#define WAL_HDRSIZE 32
/* WAL magic value. Either this value, or the same value with the least
** significant bit also set (WAL_MAGIC | 0x00000001) is stored in 32-bit
** big-endian format in the first 4 bytes of a WAL file.
**
** If the LSB is set, then the checksums for each frame within the WAL
** file are calculated by treating all data as an array of 32-bit
** big-endian words. Otherwise, they are calculated by interpreting
** all data as 32-bit little-endian words.
*/
#define WAL_MAGIC 0x377f0682
/*
** Return the offset of frame iFrame in the write-ahead log file,
** assuming a database page size of szPage bytes. The offset returned
** is to the start of the write-ahead log frame-header.
*/
#define walFrameOffset(iFrame, szPage) ( \
WAL_HDRSIZE + ((iFrame)-1)*(i64)((szPage)+WAL_FRAME_HDRSIZE) \
)
/*
** An open write-ahead log file is represented by an instance of the
** following object.
*/
struct Wal {
sqlite3_vfs *pVfs; /* The VFS used to create pDbFd */
sqlite3_file *pDbFd; /* File handle for the database file */
sqlite3_file *pWalFd; /* File handle for WAL file */
u32 iCallback; /* Value to pass to log callback (or 0) */
i64 mxWalSize; /* Truncate WAL to this size upon reset */
int nWiData; /* Size of array apWiData */
int szFirstBlock; /* Size of first block written to WAL file */
volatile u32 **apWiData; /* Pointer to wal-index content in memory */
u32 szPage; /* Database page size */
i16 readLock; /* Which read lock is being held. -1 for none */
u8 syncFlags; /* Flags to use to sync header writes */
u8 exclusiveMode; /* Non-zero if connection is in exclusive mode */
u8 writeLock; /* True if in a write transaction */
u8 ckptLock; /* True if holding a checkpoint lock */
u8 readOnly; /* WAL_RDWR, WAL_RDONLY, or WAL_SHM_RDONLY */
u8 truncateOnCommit; /* True to truncate WAL file on commit */
u8 syncHeader; /* Fsync the WAL header if true */
u8 padToSectorBoundary; /* Pad transactions out to the next sector */
u8 bShmUnreliable; /* SHM content is read-only and unreliable */
WalIndexHdr hdr; /* Wal-index header for current transaction */
u32 minFrame; /* Ignore wal frames before this one */
u32 iReCksum; /* On commit, recalculate checksums from here */
const char *zWalName; /* Name of WAL file */
u32 nCkpt; /* Checkpoint sequence counter in the wal-header */
#ifdef SQLITE_DEBUG
u8 lockError; /* True if a locking error has occurred */
#endif
#ifdef SQLITE_ENABLE_SNAPSHOT
WalIndexHdr *pSnapshot; /* Start transaction here if not NULL */
#endif
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
sqlite3 *db;
#endif
};
/*
** Candidate values for Wal.exclusiveMode.
*/
#define WAL_NORMAL_MODE 0
#define WAL_EXCLUSIVE_MODE 1
#define WAL_HEAPMEMORY_MODE 2
/*
** Possible values for WAL.readOnly
*/
#define WAL_RDWR 0 /* Normal read/write connection */
#define WAL_RDONLY 1 /* The WAL file is readonly */
#define WAL_SHM_RDONLY 2 /* The SHM file is readonly */
/*
** Each page of the wal-index mapping contains a hash-table made up of
** an array of HASHTABLE_NSLOT elements of the following type.
*/
typedef u16 ht_slot;
/*
** This structure is used to implement an iterator that loops through
** all frames in the WAL in database page order. Where two or more frames
** correspond to the same database page, the iterator visits only the
** frame most recently written to the WAL (in other words, the frame with
** the largest index).
**
** The internals of this structure are only accessed by:
**
** walIteratorInit() - Create a new iterator,
** walIteratorNext() - Step an iterator,
** walIteratorFree() - Free an iterator.
**
** This functionality is used by the checkpoint code (see walCheckpoint()).
*/
struct WalIterator {
u32 iPrior; /* Last result returned from the iterator */
int nSegment; /* Number of entries in aSegment[] */
struct WalSegment {
int iNext; /* Next slot in aIndex[] not yet returned */
ht_slot *aIndex; /* i0, i1, i2... such that aPgno[iN] ascend */
u32 *aPgno; /* Array of page numbers. */
int nEntry; /* Nr. of entries in aPgno[] and aIndex[] */
int iZero; /* Frame number associated with aPgno[0] */
} aSegment[1]; /* One for every 32KB page in the wal-index */
};
/*
** Define the parameters of the hash tables in the wal-index file. There
** is a hash-table following every HASHTABLE_NPAGE page numbers in the
** wal-index.
**
** Changing any of these constants will alter the wal-index format and
** create incompatibilities.
*/
#define HASHTABLE_NPAGE 4096 /* Must be power of 2 */
#define HASHTABLE_HASH_1 383 /* Should be prime */
#define HASHTABLE_NSLOT (HASHTABLE_NPAGE*2) /* Must be a power of 2 */
/*
** The block of page numbers associated with the first hash-table in a
** wal-index is smaller than usual. This is so that there is a complete
** hash-table on each aligned 32KB page of the wal-index.
*/
#define HASHTABLE_NPAGE_ONE (HASHTABLE_NPAGE - (WALINDEX_HDR_SIZE/sizeof(u32)))
/* The wal-index is divided into pages of WALINDEX_PGSZ bytes each. */
#define WALINDEX_PGSZ ( \
sizeof(ht_slot)*HASHTABLE_NSLOT + HASHTABLE_NPAGE*sizeof(u32) \
)
/*
** Obtain a pointer to the iPage'th page of the wal-index. The wal-index
** is broken into pages of WALINDEX_PGSZ bytes. Wal-index pages are
** numbered from zero.
**
** If the wal-index is currently smaller the iPage pages then the size
** of the wal-index might be increased, but only if it is safe to do
** so. It is safe to enlarge the wal-index if pWal->writeLock is true
** or pWal->exclusiveMode==WAL_HEAPMEMORY_MODE.
**
** Three possible result scenarios:
**
** (1) rc==SQLITE_OK and *ppPage==Requested-Wal-Index-Page
** (2) rc>=SQLITE_ERROR and *ppPage==NULL
** (3) rc==SQLITE_OK and *ppPage==NULL // only if iPage==0
**
** Scenario (3) can only occur when pWal->writeLock is false and iPage==0
*/
static SQLITE_NOINLINE int walIndexPageRealloc(
Wal *pWal, /* The WAL context */
int iPage, /* The page we seek */
volatile u32 **ppPage /* Write the page pointer here */
){
int rc = SQLITE_OK;
/* Enlarge the pWal->apWiData[] array if required */
if( pWal->nWiData<=iPage ){
sqlite3_int64 nByte = sizeof(u32*)*(iPage+1);
volatile u32 **apNew;
apNew = (volatile u32 **)sqlite3Realloc((void *)pWal->apWiData, nByte);
if( !apNew ){
*ppPage = 0;
return SQLITE_NOMEM_BKPT;
}
bzero((void*)&apNew[pWal->nWiData],
sizeof(u32*)*(iPage+1-pWal->nWiData));
pWal->apWiData = apNew;
pWal->nWiData = iPage+1;
}
/* Request a pointer to the required page from the VFS */
assert( pWal->apWiData[iPage]==0 );
if( pWal->exclusiveMode==WAL_HEAPMEMORY_MODE ){
pWal->apWiData[iPage] = (u32 volatile *)sqlite3MallocZero(WALINDEX_PGSZ);
if( !pWal->apWiData[iPage] ) rc = SQLITE_NOMEM_BKPT;
}else{
rc = sqlite3OsShmMap(pWal->pDbFd, iPage, WALINDEX_PGSZ,
pWal->writeLock, (void volatile **)&pWal->apWiData[iPage]
);
assert( pWal->apWiData[iPage]!=0
|| rc!=SQLITE_OK
|| (pWal->writeLock==0 && iPage==0) );
testcase( pWal->apWiData[iPage]==0 && rc==SQLITE_OK );
if( rc==SQLITE_OK ){
if( iPage>0 && sqlite3FaultSim(600) ) rc = SQLITE_NOMEM;
}else if( (rc&0xff)==SQLITE_READONLY ){
pWal->readOnly |= WAL_SHM_RDONLY;
if( rc==SQLITE_READONLY ){
rc = SQLITE_OK;
}
}
}
*ppPage = pWal->apWiData[iPage];
assert( iPage==0 || *ppPage || rc!=SQLITE_OK );
return rc;
}
static int walIndexPage(
Wal *pWal, /* The WAL context */
int iPage, /* The page we seek */
volatile u32 **ppPage /* Write the page pointer here */
){
if( pWal->nWiData<=iPage || (*ppPage = pWal->apWiData[iPage])==0 ){
return walIndexPageRealloc(pWal, iPage, ppPage);
}
return SQLITE_OK;
}
/*
** Return a pointer to the WalCkptInfo structure in the wal-index.
*/
static volatile WalCkptInfo *walCkptInfo(Wal *pWal){
assert( pWal->nWiData>0 && pWal->apWiData[0] );
return (volatile WalCkptInfo*)&(pWal->apWiData[0][sizeof(WalIndexHdr)/2]);
}
/*
** Return a pointer to the WalIndexHdr structure in the wal-index.
*/
static volatile WalIndexHdr *walIndexHdr(Wal *pWal){
assert( pWal->nWiData>0 && pWal->apWiData[0] );
return (volatile WalIndexHdr*)pWal->apWiData[0];
}
/*
** The argument to this macro must be of type u32. On a little-endian
** architecture, it returns the u32 value that results from interpreting
** the 4 bytes as a big-endian value. On a big-endian architecture, it
** returns the value that would be produced by interpreting the 4 bytes
** of the input value as a little-endian integer.
*/
#define BYTESWAP32(x) ( \
(((x)&0x000000FF)<<24) + (((x)&0x0000FF00)<<8) \
+ (((x)&0x00FF0000)>>8) + (((x)&0xFF000000)>>24) \
)
/*
** Generate or extend an 8 byte checksum based on the data in
** array aByte[] and the initial values of aIn[0] and aIn[1] (or
** initial values of 0 and 0 if aIn==NULL).
**
** The checksum is written back into aOut[] before returning.
**
** nByte must be a positive multiple of 8.
*/
static void walChecksumBytes(
int nativeCksum, /* True for native byte-order, false for non-native */
u8 *a, /* Content to be checksummed */
int nByte, /* Bytes of content in a[]. Must be a multiple of 8. */
const u32 *aIn, /* Initial checksum value input */
u32 *aOut /* OUT: Final checksum value output */
){
u32 s1, s2;
u32 *aData = (u32 *)a;
u32 *aEnd = (u32 *)&a[nByte];
if( aIn ){
s1 = aIn[0];
s2 = aIn[1];
}else{
s1 = s2 = 0;
}
assert( nByte>=8 );
assert( (nByte&0x00000007)==0 );
assert( nByte<=65536 );
if( nativeCksum ){
do {
s1 += *aData++ + s2;
s2 += *aData++ + s1;
}while( aData<aEnd );
}else{
do {
s1 += BYTESWAP32(aData[0]) + s2;
s2 += BYTESWAP32(aData[1]) + s1;
aData += 2;
}while( aData<aEnd );
}
aOut[0] = s1;
aOut[1] = s2;
}
/*
** If there is the possibility of concurrent access to the SHM file
** from multiple threads and/or processes, then do a memory barrier.
*/
static void walShmBarrier(Wal *pWal){
if( pWal->exclusiveMode!=WAL_HEAPMEMORY_MODE ){
sqlite3OsShmBarrier(pWal->pDbFd);
}
}
/*
** Add the SQLITE_NO_TSAN as part of the return-type of a function
** definition as a hint that the function contains constructs that
** might give false-positive TSAN warnings.
**
** See tag-20200519-1.
*/
#if defined(__clang__) && !defined(SQLITE_NO_TSAN)
# define SQLITE_NO_TSAN __attribute__((no_sanitize_thread))
#else
# define SQLITE_NO_TSAN
#endif
/*
** Write the header information in pWal->hdr into the wal-index.
**
** The checksum on pWal->hdr is updated before it is written.
*/
static SQLITE_NO_TSAN void walIndexWriteHdr(Wal *pWal){
volatile WalIndexHdr *aHdr = walIndexHdr(pWal);
const int nCksum = offsetof(WalIndexHdr, aCksum);
assert( pWal->writeLock );
pWal->hdr.isInit = 1;
pWal->hdr.iVersion = WALINDEX_MAX_VERSION;
walChecksumBytes(1, (u8*)&pWal->hdr, nCksum, 0, pWal->hdr.aCksum);
/* Possible TSAN false-positive. See tag-20200519-1 */
memcpy((void*)&aHdr[1], (const void*)&pWal->hdr, sizeof(WalIndexHdr));
walShmBarrier(pWal);
memcpy((void*)&aHdr[0], (const void*)&pWal->hdr, sizeof(WalIndexHdr));
}
/*
** This function encodes a single frame header and writes it to a buffer
** supplied by the caller. A frame-header is made up of a series of
** 4-byte big-endian integers, as follows:
**
** 0: Page number.
** 4: For commit records, the size of the database image in pages
** after the commit. For all other records, zero.
** 8: Salt-1 (copied from the wal-header)
** 12: Salt-2 (copied from the wal-header)
** 16: Checksum-1.
** 20: Checksum-2.
*/
static void walEncodeFrame(
Wal *pWal, /* The write-ahead log */
u32 iPage, /* Database page number for frame */
u32 nTruncate, /* New db size (or 0 for non-commit frames) */
u8 *aData, /* Pointer to page data */
u8 *aFrame /* OUT: Write encoded frame here */
){
int nativeCksum; /* True for native byte-order checksums */
u32 *aCksum = pWal->hdr.aFrameCksum;
assert( WAL_FRAME_HDRSIZE==24 );
sqlite3Put4byte(&aFrame[0], iPage);
sqlite3Put4byte(&aFrame[4], nTruncate);
if( pWal->iReCksum==0 ){
memcpy(&aFrame[8], pWal->hdr.aSalt, 8);
nativeCksum = (pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN);
walChecksumBytes(nativeCksum, aFrame, 8, aCksum, aCksum);
walChecksumBytes(nativeCksum, aData, pWal->szPage, aCksum, aCksum);
sqlite3Put4byte(&aFrame[16], aCksum[0]);
sqlite3Put4byte(&aFrame[20], aCksum[1]);
}else{
bzero(&aFrame[8], 16);
}
}
/*
** Check to see if the frame with header in aFrame[] and content
** in aData[] is valid. If it is a valid frame, fill *piPage and
** *pnTruncate and return true. Return if the frame is not valid.
*/
static int walDecodeFrame(
Wal *pWal, /* The write-ahead log */
u32 *piPage, /* OUT: Database page number for frame */
u32 *pnTruncate, /* OUT: New db size (or 0 if not commit) */
u8 *aData, /* Pointer to page data (for checksum) */
u8 *aFrame /* Frame data */
){
int nativeCksum; /* True for native byte-order checksums */
u32 *aCksum = pWal->hdr.aFrameCksum;
u32 pgno; /* Page number of the frame */
assert( WAL_FRAME_HDRSIZE==24 );
/* A frame is only valid if the salt values in the frame-header
** match the salt values in the wal-header.
*/
if( memcmp(&pWal->hdr.aSalt, &aFrame[8], 8)!=0 ){
return 0;
}
/* A frame is only valid if the page number is creater than zero.
*/
pgno = sqlite3Get4byte(&aFrame[0]);
if( pgno==0 ){
return 0;
}
/* A frame is only valid if a checksum of the WAL header,
** all prior frams, the first 16 bytes of this frame-header,
** and the frame-data matches the checksum in the last 8
** bytes of this frame-header.
*/
nativeCksum = (pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN);
walChecksumBytes(nativeCksum, aFrame, 8, aCksum, aCksum);
walChecksumBytes(nativeCksum, aData, pWal->szPage, aCksum, aCksum);
if( aCksum[0]!=sqlite3Get4byte(&aFrame[16])
|| aCksum[1]!=sqlite3Get4byte(&aFrame[20])
){
/* Checksum failed. */
return 0;
}
/* If we reach this point, the frame is valid. Return the page number
** and the new database size.
*/
*piPage = pgno;
*pnTruncate = sqlite3Get4byte(&aFrame[4]);
return 1;
}
#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
/*
** Names of locks. This routine is used to provide debugging output and is not
** a part of an ordinary build.
*/
static const char *walLockName(int lockIdx){
if( lockIdx==WAL_WRITE_LOCK ){
return "WRITE-LOCK";
}else if( lockIdx==WAL_CKPT_LOCK ){
return "CKPT-LOCK";
}else if( lockIdx==WAL_RECOVER_LOCK ){
return "RECOVER-LOCK";
}else{
static char zName[15];
sqlite3_snprintf(sizeof(zName), zName, "READ-LOCK[%d]",
lockIdx-WAL_READ_LOCK(0));
return zName;
}
}
#endif /*defined(SQLITE_TEST) || defined(SQLITE_DEBUG) */
/*
** Set or release locks on the WAL. Locks are either shared or exclusive.
** A lock cannot be moved directly between shared and exclusive - it must go
** through the unlocked state first.
**
** In locking_mode=EXCLUSIVE, all of these routines become no-ops.
*/
static int walLockShared(Wal *pWal, int lockIdx){
int rc;
if( pWal->exclusiveMode ) return SQLITE_OK;
rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
SQLITE_SHM_LOCK | SQLITE_SHM_SHARED);
WALTRACE(("WAL%p: acquire SHARED-%s %s\n", pWal,
walLockName(lockIdx), rc ? "failed" : "ok"));
VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && (rc&0xFF)!=SQLITE_BUSY); )
return rc;
}
static void walUnlockShared(Wal *pWal, int lockIdx){
if( pWal->exclusiveMode ) return;
(void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED);
WALTRACE(("WAL%p: release SHARED-%s\n", pWal, walLockName(lockIdx)));
}
static int walLockExclusive(Wal *pWal, int lockIdx, int n){
int rc;
if( pWal->exclusiveMode ) return SQLITE_OK;
rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE);
WALTRACE(("WAL%p: acquire EXCLUSIVE-%s cnt=%d %s\n", pWal,
walLockName(lockIdx), n, rc ? "failed" : "ok"));
VVA_ONLY( pWal->lockError = (u8)(rc!=SQLITE_OK && (rc&0xFF)!=SQLITE_BUSY); )
return rc;
}
static void walUnlockExclusive(Wal *pWal, int lockIdx, int n){
if( pWal->exclusiveMode ) return;
(void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE);
WALTRACE(("WAL%p: release EXCLUSIVE-%s cnt=%d\n", pWal,
walLockName(lockIdx), n));
}
/*
** Compute a hash on a page number. The resulting hash value must land
** between 0 and (HASHTABLE_NSLOT-1). The walHashNext() function advances
** the hash to the next value in the event of a collision.
*/
static int walHash(u32 iPage){
assert( iPage>0 );
assert( (HASHTABLE_NSLOT & (HASHTABLE_NSLOT-1))==0 );
return (iPage*HASHTABLE_HASH_1) & (HASHTABLE_NSLOT-1);
}
static int walNextHash(int iPriorHash){
return (iPriorHash+1)&(HASHTABLE_NSLOT-1);
}
/*
** An instance of the WalHashLoc object is used to describe the location
** of a page hash table in the wal-index. This becomes the return value
** from walHashGet().
*/
typedef struct WalHashLoc WalHashLoc;
struct WalHashLoc {
volatile ht_slot *aHash; /* Start of the wal-index hash table */
volatile u32 *aPgno; /* aPgno[1] is the page of first frame indexed */
u32 iZero; /* One less than the frame number of first indexed*/
};
/*
** Return pointers to the hash table and page number array stored on
** page iHash of the wal-index. The wal-index is broken into 32KB pages
** numbered starting from 0.
**
** Set output variable pLoc->aHash to point to the start of the hash table
** in the wal-index file. Set pLoc->iZero to one less than the frame
** number of the first frame indexed by this hash table. If a
** slot in the hash table is set to N, it refers to frame number
** (pLoc->iZero+N) in the log.
**
** Finally, set pLoc->aPgno so that pLoc->aPgno[0] is the page number of the
** first frame indexed by the hash table, frame (pLoc->iZero).
*/
static int walHashGet(
Wal *pWal, /* WAL handle */
int iHash, /* Find the iHash'th table */
WalHashLoc *pLoc /* OUT: Hash table location */
){
int rc; /* Return code */
rc = walIndexPage(pWal, iHash, &pLoc->aPgno);
assert( rc==SQLITE_OK || iHash>0 );
if( pLoc->aPgno ){
pLoc->aHash = (volatile ht_slot *)&pLoc->aPgno[HASHTABLE_NPAGE];
if( iHash==0 ){
pLoc->aPgno = &pLoc->aPgno[WALINDEX_HDR_SIZE/sizeof(u32)];
pLoc->iZero = 0;
}else{
pLoc->iZero = HASHTABLE_NPAGE_ONE + (iHash-1)*HASHTABLE_NPAGE;
}
}else if( NEVER(rc==SQLITE_OK) ){
rc = SQLITE_ERROR;
}
return rc;
}
/*
** Return the number of the wal-index page that contains the hash-table
** and page-number array that contain entries corresponding to WAL frame
** iFrame. The wal-index is broken up into 32KB pages. Wal-index pages
** are numbered starting from 0.
*/
static int walFramePage(u32 iFrame){
int iHash = (iFrame+HASHTABLE_NPAGE-HASHTABLE_NPAGE_ONE-1) / HASHTABLE_NPAGE;
assert( (iHash==0 || iFrame>HASHTABLE_NPAGE_ONE)
&& (iHash>=1 || iFrame<=HASHTABLE_NPAGE_ONE)
&& (iHash<=1 || iFrame>(HASHTABLE_NPAGE_ONE+HASHTABLE_NPAGE))
&& (iHash>=2 || iFrame<=HASHTABLE_NPAGE_ONE+HASHTABLE_NPAGE)
&& (iHash<=2 || iFrame>(HASHTABLE_NPAGE_ONE+2*HASHTABLE_NPAGE))
);
assert( iHash>=0 );
return iHash;
}
/*
** Return the page number associated with frame iFrame in this WAL.
*/
static u32 walFramePgno(Wal *pWal, u32 iFrame){
int iHash = walFramePage(iFrame);
if( iHash==0 ){
return pWal->apWiData[0][WALINDEX_HDR_SIZE/sizeof(u32) + iFrame - 1];
}
return pWal->apWiData[iHash][(iFrame-1-HASHTABLE_NPAGE_ONE)%HASHTABLE_NPAGE];
}
/*
** Remove entries from the hash table that point to WAL slots greater
** than pWal->hdr.mxFrame.
**
** This function is called whenever pWal->hdr.mxFrame is decreased due
** to a rollback or savepoint.
**
** At most only the hash table containing pWal->hdr.mxFrame needs to be
** updated. Any later hash tables will be automatically cleared when
** pWal->hdr.mxFrame advances to the point where those hash tables are
** actually needed.
*/
static void walCleanupHash(Wal *pWal){
WalHashLoc sLoc; /* Hash table location */
int iLimit = 0; /* Zero values greater than this */
int nByte; /* Number of bytes to zero in aPgno[] */
int i; /* Used to iterate through aHash[] */
assert( pWal->writeLock );
testcase( pWal->hdr.mxFrame==HASHTABLE_NPAGE_ONE-1 );
testcase( pWal->hdr.mxFrame==HASHTABLE_NPAGE_ONE );
testcase( pWal->hdr.mxFrame==HASHTABLE_NPAGE_ONE+1 );
if( pWal->hdr.mxFrame==0 ) return;
/* Obtain pointers to the hash-table and page-number array containing
** the entry that corresponds to frame pWal->hdr.mxFrame. It is guaranteed
** that the page said hash-table and array reside on is already mapped.(1)
*/
assert( pWal->nWiData>walFramePage(pWal->hdr.mxFrame) );
assert( pWal->apWiData[walFramePage(pWal->hdr.mxFrame)] );
i = walHashGet(pWal, walFramePage(pWal->hdr.mxFrame), &sLoc);
if( NEVER(i) ) return; /* Defense-in-depth, in case (1) above is wrong */
/* Zero all hash-table entries that correspond to frame numbers greater
** than pWal->hdr.mxFrame.
*/
iLimit = pWal->hdr.mxFrame - sLoc.iZero;
assert( iLimit>0 );
for(i=0; i<HASHTABLE_NSLOT; i++){
if( sLoc.aHash[i]>iLimit ){
sLoc.aHash[i] = 0;
}
}
/* Zero the entries in the aPgno array that correspond to frames with
** frame numbers greater than pWal->hdr.mxFrame.
*/
nByte = (int)((char *)sLoc.aHash - (char *)&sLoc.aPgno[iLimit]);
assert( nByte>=0 );
bzero((void *)&sLoc.aPgno[iLimit], nByte);
#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
/* Verify that the every entry in the mapping region is still reachable
** via the hash table even after the cleanup.
*/
if( iLimit ){
int j; /* Loop counter */
int iKey; /* Hash key */
for(j=0; j<iLimit; j++){
for(iKey=walHash(sLoc.aPgno[j]);sLoc.aHash[iKey];iKey=walNextHash(iKey)){
if( sLoc.aHash[iKey]==j+1 ) break;
}
assert( sLoc.aHash[iKey]==j+1 );
}
}
#endif /* SQLITE_ENABLE_EXPENSIVE_ASSERT */
}
/*
** Set an entry in the wal-index that will map database page number
** pPage into WAL frame iFrame.
*/
static int walIndexAppend(Wal *pWal, u32 iFrame, u32 iPage){
int rc; /* Return code */
WalHashLoc sLoc; /* Wal-index hash table location */
rc = walHashGet(pWal, walFramePage(iFrame), &sLoc);
/* Assuming the wal-index file was successfully mapped, populate the
** page number array and hash table entry.
*/
if( rc==SQLITE_OK ){
int iKey; /* Hash table key */
int idx; /* Value to write to hash-table slot */
int nCollide; /* Number of hash collisions */
idx = iFrame - sLoc.iZero;
assert( idx <= HASHTABLE_NSLOT/2 + 1 );
/* If this is the first entry to be added to this hash-table, zero the
** entire hash table and aPgno[] array before proceeding.
*/
if( idx==1 ){
int nByte = (int)((u8*)&sLoc.aHash[HASHTABLE_NSLOT] - (u8*)sLoc.aPgno);
assert( nByte>=0 );
bzero((void*)sLoc.aPgno, nByte);
}
/* If the entry in aPgno[] is already set, then the previous writer
** must have exited unexpectedly in the middle of a transaction (after
** writing one or more dirty pages to the WAL to free up memory).
** Remove the remnants of that writers uncommitted transaction from
** the hash-table before writing any new entries.
*/
if( sLoc.aPgno[idx-1] ){
walCleanupHash(pWal);
assert( !sLoc.aPgno[idx-1] );
}
/* Write the aPgno[] array entry and the hash-table slot. */
nCollide = idx;
for(iKey=walHash(iPage); sLoc.aHash[iKey]; iKey=walNextHash(iKey)){
if( (nCollide--)==0 ) return SQLITE_CORRUPT_BKPT;
}
sLoc.aPgno[idx-1] = iPage;
AtomicStore(&sLoc.aHash[iKey], (ht_slot)idx);
#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
/* Verify that the number of entries in the hash table exactly equals
** the number of entries in the mapping region.
*/
{
int i; /* Loop counter */
int nEntry = 0; /* Number of entries in the hash table */
for(i=0; i<HASHTABLE_NSLOT; i++){ if( sLoc.aHash[i] ) nEntry++; }
assert( nEntry==idx );
}
/* Verify that the every entry in the mapping region is reachable
** via the hash table. This turns out to be a really, really expensive
** thing to check, so only do this occasionally - not on every
** iteration.
*/
if( (idx&0x3ff)==0 ){
int i; /* Loop counter */
for(i=0; i<idx; i++){
for(iKey=walHash(sLoc.aPgno[i]);
sLoc.aHash[iKey];
iKey=walNextHash(iKey)){
if( sLoc.aHash[iKey]==i+1 ) break;
}
assert( sLoc.aHash[iKey]==i+1 );
}
}
#endif /* SQLITE_ENABLE_EXPENSIVE_ASSERT */
}
return rc;
}
/*
** Recover the wal-index by reading the write-ahead log file.
**
** This routine first tries to establish an exclusive lock on the
** wal-index to prevent other threads/processes from doing anything
** with the WAL or wal-index while recovery is running. The
** WAL_RECOVER_LOCK is also held so that other threads will know
** that this thread is running recovery. If unable to establish
** the necessary locks, this routine returns SQLITE_BUSY.
*/
static int walIndexRecover(Wal *pWal){
int rc; /* Return Code */
i64 nSize; /* Size of log file */
u32 aFrameCksum[2] = {0, 0};
int iLock; /* Lock offset to lock for checkpoint */
/* Obtain an exclusive lock on all byte in the locking range not already
** locked by the caller. The caller is guaranteed to have locked the
** WAL_WRITE_LOCK byte, and may have also locked the WAL_CKPT_LOCK byte.
** If successful, the same bytes that are locked here are unlocked before
** this function returns.
*/
assert( pWal->ckptLock==1 || pWal->ckptLock==0 );
assert( WAL_ALL_BUT_WRITE==WAL_WRITE_LOCK+1 );
assert( WAL_CKPT_LOCK==WAL_ALL_BUT_WRITE );
assert( pWal->writeLock );
iLock = WAL_ALL_BUT_WRITE + pWal->ckptLock;
rc = walLockExclusive(pWal, iLock, WAL_READ_LOCK(0)-iLock);
if( rc ){
return rc;
}
WALTRACE(("WAL%p: recovery begin...\n", pWal));
memset(&pWal->hdr, 0, sizeof(WalIndexHdr));
rc = sqlite3OsFileSize(pWal->pWalFd, &nSize);
if( rc!=SQLITE_OK ){
goto recovery_error;
}
if( nSize>WAL_HDRSIZE ){
u8 aBuf[WAL_HDRSIZE]; /* Buffer to load WAL header into */
u32 *aPrivate = 0; /* Heap copy of *-shm hash being populated */
u8 *aFrame = 0; /* Malloc'd buffer to load entire frame */
int szFrame; /* Number of bytes in buffer aFrame[] */
u8 *aData; /* Pointer to data part of aFrame buffer */
int szPage; /* Page size according to the log */
u32 magic; /* Magic value read from WAL header */
u32 version; /* Magic value read from WAL header */
int isValid; /* True if this frame is valid */
u32 iPg; /* Current 32KB wal-index page */
u32 iLastFrame; /* Last frame in wal, based on nSize alone */
/* Read in the WAL header. */
rc = sqlite3OsRead(pWal->pWalFd, aBuf, WAL_HDRSIZE, 0);
if( rc!=SQLITE_OK ){
goto recovery_error;
}
/* If the database page size is not a power of two, or is greater than
** SQLITE_MAX_PAGE_SIZE, conclude that the WAL file contains no valid
** data. Similarly, if the 'magic' value is invalid, ignore the whole
** WAL file.
*/
magic = sqlite3Get4byte(&aBuf[0]);
szPage = sqlite3Get4byte(&aBuf[8]);
if( (magic&0xFFFFFFFE)!=WAL_MAGIC
|| szPage&(szPage-1)
|| szPage>SQLITE_MAX_PAGE_SIZE
|| szPage<512
){
goto finished;
}
pWal->hdr.bigEndCksum = (u8)(magic&0x00000001);
pWal->szPage = szPage;
pWal->nCkpt = sqlite3Get4byte(&aBuf[12]);
memcpy(&pWal->hdr.aSalt, &aBuf[16], 8);
/* Verify that the WAL header checksum is correct */
walChecksumBytes(pWal->hdr.bigEndCksum==SQLITE_BIGENDIAN,
aBuf, WAL_HDRSIZE-2*4, 0, pWal->hdr.aFrameCksum
);
if( pWal->hdr.aFrameCksum[0]!=sqlite3Get4byte(&aBuf[24])
|| pWal->hdr.aFrameCksum[1]!=sqlite3Get4byte(&aBuf[28])
){
goto finished;
}
/* Verify that the version number on the WAL format is one that
** are able to understand */
version = sqlite3Get4byte(&aBuf[4]);
if( version!=WAL_MAX_VERSION ){
rc = SQLITE_CANTOPEN_BKPT;
goto finished;
}
/* Malloc a buffer to read frames into. */
szFrame = szPage + WAL_FRAME_HDRSIZE;
aFrame = (u8 *)sqlite3_malloc64(szFrame + WALINDEX_PGSZ);
if( !aFrame ){
rc = SQLITE_NOMEM_BKPT;
goto recovery_error;
}
aData = &aFrame[WAL_FRAME_HDRSIZE];
aPrivate = (u32*)&aData[szPage];
/* Read all frames from the log file. */
iLastFrame = (nSize - WAL_HDRSIZE) / szFrame;
for(iPg=0; iPg<=(u32)walFramePage(iLastFrame); iPg++){
u32 *aShare;
u32 iFrame; /* Index of last frame read */
u32 iLast = MIN(iLastFrame, HASHTABLE_NPAGE_ONE+iPg*HASHTABLE_NPAGE);
u32 iFirst = 1 + (iPg==0?0:HASHTABLE_NPAGE_ONE+(iPg-1)*HASHTABLE_NPAGE);
u32 nHdr, nHdr32;
rc = walIndexPage(pWal, iPg, (volatile u32**)&aShare);
assert( aShare!=0 || rc!=SQLITE_OK );
if( aShare==0 ) break;
pWal->apWiData[iPg] = aPrivate;
for(iFrame=iFirst; iFrame<=iLast; iFrame++){
i64 iOffset = walFrameOffset(iFrame, szPage);
u32 pgno; /* Database page number for frame */
u32 nTruncate; /* dbsize field from frame header */
/* Read and decode the next log frame. */
rc = sqlite3OsRead(pWal->pWalFd, aFrame, szFrame, iOffset);
if( rc!=SQLITE_OK ) break;
isValid = walDecodeFrame(pWal, &pgno, &nTruncate, aData, aFrame);
if( !isValid ) break;
rc = walIndexAppend(pWal, iFrame, pgno);
if( NEVER(rc!=SQLITE_OK) ) break;
/* If nTruncate is non-zero, this is a commit record. */
if( nTruncate ){
pWal->hdr.mxFrame = iFrame;
pWal->hdr.nPage = nTruncate;
pWal->hdr.szPage = (u16)((szPage&0xff00) | (szPage>>16));
testcase( szPage<=32768 );
testcase( szPage>=65536 );
aFrameCksum[0] = pWal->hdr.aFrameCksum[0];
aFrameCksum[1] = pWal->hdr.aFrameCksum[1];
}
}
pWal->apWiData[iPg] = aShare;
nHdr = (iPg==0 ? WALINDEX_HDR_SIZE : 0);
nHdr32 = nHdr / sizeof(u32);
#ifndef SQLITE_SAFER_WALINDEX_RECOVERY
/* Memcpy() should work fine here, on all reasonable implementations.
** Technically, memcpy() might change the destination to some
** intermediate value before setting to the final value, and that might
** cause a concurrent reader to malfunction. Memcpy() is allowed to
** do that, according to the spec, but no memcpy() implementation that
** we know of actually does that, which is why we say that memcpy()
** is safe for this. Memcpy() is certainly a lot faster.
*/
memcpy(&aShare[nHdr32], &aPrivate[nHdr32], WALINDEX_PGSZ-nHdr);
#else
/* In the event that some platform is found for which memcpy()
** changes the destination to some intermediate value before
** setting the final value, this alternative copy routine is
** provided.
*/
{
int i;
for(i=nHdr32; i<WALINDEX_PGSZ/sizeof(u32); i++){
if( aShare[i]!=aPrivate[i] ){
/* Atomic memory operations are not required here because if
** the value needs to be changed, that means it is not being
** accessed concurrently. */
aShare[i] = aPrivate[i];
}
}
}
#endif
if( iFrame<=iLast ) break;
}
sqlite3_free(aFrame);
}
finished:
if( rc==SQLITE_OK ){
volatile WalCkptInfo *pInfo;
int i;
pWal->hdr.aFrameCksum[0] = aFrameCksum[0];
pWal->hdr.aFrameCksum[1] = aFrameCksum[1];
walIndexWriteHdr(pWal);
/* Reset the checkpoint-header. This is safe because this thread is
** currently holding locks that exclude all other writers and
** checkpointers. Then set the values of read-mark slots 1 through N.
*/
pInfo = walCkptInfo(pWal);
pInfo->nBackfill = 0;
pInfo->nBackfillAttempted = pWal->hdr.mxFrame;
pInfo->aReadMark[0] = 0;
for(i=1; i<WAL_NREADER; i++){
rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
if( rc==SQLITE_OK ){
if( i==1 && pWal->hdr.mxFrame ){
pInfo->aReadMark[i] = pWal->hdr.mxFrame;
}else{
pInfo->aReadMark[i] = READMARK_NOT_USED;
}
walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
}else if( rc!=SQLITE_BUSY ){
goto recovery_error;
}
}
/* If more than one frame was recovered from the log file, report an
** event via sqlite3_log(). This is to help with identifying performance
** problems caused by applications routinely shutting down without
** checkpointing the log file.
*/
if( pWal->hdr.nPage ){
sqlite3_log(SQLITE_NOTICE_RECOVER_WAL,
"recovered %d frames from WAL file %s",
pWal->hdr.mxFrame, pWal->zWalName
);
}
}
recovery_error:
WALTRACE(("WAL%p: recovery %s\n", pWal, rc ? "failed" : "ok"));
walUnlockExclusive(pWal, iLock, WAL_READ_LOCK(0)-iLock);
return rc;
}
/*
** Close an open wal-index.
*/
static void walIndexClose(Wal *pWal, int isDelete){
if( pWal->exclusiveMode==WAL_HEAPMEMORY_MODE || pWal->bShmUnreliable ){
int i;
for(i=0; i<pWal->nWiData; i++){
sqlite3_free((void *)pWal->apWiData[i]);
pWal->apWiData[i] = 0;
}
}
if( pWal->exclusiveMode!=WAL_HEAPMEMORY_MODE ){
sqlite3OsShmUnmap(pWal->pDbFd, isDelete);
}
}
/*
** Open a connection to the WAL file zWalName. The database file must
** already be opened on connection pDbFd. The buffer that zWalName points
** to must remain valid for the lifetime of the returned Wal* handle.
**
** A SHARED lock should be held on the database file when this function
** is called. The purpose of this SHARED lock is to prevent any other
** client from unlinking the WAL or wal-index file. If another process
** were to do this just after this client opened one of these files, the
** system would be badly broken.
**
** If the log file is successfully opened, SQLITE_OK is returned and
** *ppWal is set to point to a new WAL handle. If an error occurs,
** an SQLite error code is returned and *ppWal is left unmodified.
*/
int sqlite3WalOpen(
sqlite3_vfs *pVfs, /* vfs module to open wal and wal-index */
sqlite3_file *pDbFd, /* The open database file */
const char *zWalName, /* Name of the WAL file */
int bNoShm, /* True to run in heap-memory mode */
i64 mxWalSize, /* Truncate WAL to this size on reset */
Wal **ppWal /* OUT: Allocated Wal handle */
){
int rc; /* Return Code */
Wal *pRet; /* Object to allocate and return */
int flags; /* Flags passed to OsOpen() */
assert( zWalName && zWalName[0] );
assert( pDbFd );
/* Verify the values of various constants. Any changes to the values
** of these constants would result in an incompatible on-disk format
** for the -shm file. Any change that causes one of these asserts to
** fail is a backward compatibility problem, even if the change otherwise
** works.
**
** This table also serves as a helpful cross-reference when trying to
** interpret hex dumps of the -shm file.
*/
assert( 48 == sizeof(WalIndexHdr) );
assert( 40 == sizeof(WalCkptInfo) );
assert( 120 == WALINDEX_LOCK_OFFSET );
assert( 136 == WALINDEX_HDR_SIZE );
assert( 4096 == HASHTABLE_NPAGE );
assert( 4062 == HASHTABLE_NPAGE_ONE );
assert( 8192 == HASHTABLE_NSLOT );
assert( 383 == HASHTABLE_HASH_1 );
assert( 32768 == WALINDEX_PGSZ );
assert( 8 == SQLITE_SHM_NLOCK );
assert( 5 == WAL_NREADER );
assert( 24 == WAL_FRAME_HDRSIZE );
assert( 32 == WAL_HDRSIZE );
assert( 120 == WALINDEX_LOCK_OFFSET + WAL_WRITE_LOCK );
assert( 121 == WALINDEX_LOCK_OFFSET + WAL_CKPT_LOCK );
assert( 122 == WALINDEX_LOCK_OFFSET + WAL_RECOVER_LOCK );
assert( 123 == WALINDEX_LOCK_OFFSET + WAL_READ_LOCK(0) );
assert( 124 == WALINDEX_LOCK_OFFSET + WAL_READ_LOCK(1) );
assert( 125 == WALINDEX_LOCK_OFFSET + WAL_READ_LOCK(2) );
assert( 126 == WALINDEX_LOCK_OFFSET + WAL_READ_LOCK(3) );
assert( 127 == WALINDEX_LOCK_OFFSET + WAL_READ_LOCK(4) );
/* In the amalgamation, the os_unix.c and os_win.c source files come before
** this source file. Verify that the #defines of the locking byte offsets
** in os_unix.c and os_win.c agree with the WALINDEX_LOCK_OFFSET value.
** For that matter, if the lock offset ever changes from its initial design
** value of 120, we need to know that so there is an assert() to check it.
*/
#ifdef WIN_SHM_BASE
assert( WIN_SHM_BASE==WALINDEX_LOCK_OFFSET );
#endif
#ifdef UNIX_SHM_BASE
assert( UNIX_SHM_BASE==WALINDEX_LOCK_OFFSET );
#endif
/* Allocate an instance of struct Wal to return. */
*ppWal = 0;
pRet = (Wal*)sqlite3MallocZero(sizeof(Wal) + pVfs->szOsFile);
if( !pRet ){
return SQLITE_NOMEM_BKPT;
}
pRet->pVfs = pVfs;
pRet->pWalFd = (sqlite3_file *)&pRet[1];
pRet->pDbFd = pDbFd;
pRet->readLock = -1;
pRet->mxWalSize = mxWalSize;
pRet->zWalName = zWalName;
pRet->syncHeader = 1;
pRet->padToSectorBoundary = 1;
pRet->exclusiveMode = (bNoShm ? WAL_HEAPMEMORY_MODE: WAL_NORMAL_MODE);
/* Open file handle on the write-ahead log file. */
flags = (SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|SQLITE_OPEN_WAL);
rc = sqlite3OsOpen(pVfs, zWalName, pRet->pWalFd, flags, &flags);
if( rc==SQLITE_OK && flags&SQLITE_OPEN_READONLY ){
pRet->readOnly = WAL_RDONLY;
}
if( rc!=SQLITE_OK ){
walIndexClose(pRet, 0);
sqlite3OsClose(pRet->pWalFd);
sqlite3_free(pRet);
}else{
int iDC = sqlite3OsDeviceCharacteristics(pDbFd);
if( iDC & SQLITE_IOCAP_SEQUENTIAL ){ pRet->syncHeader = 0; }
if( iDC & SQLITE_IOCAP_POWERSAFE_OVERWRITE ){
pRet->padToSectorBoundary = 0;
}
*ppWal = pRet;
WALTRACE(("WAL%d: opened\n", pRet));
}
return rc;
}
/*
** Change the size to which the WAL file is trucated on each reset.
*/
void sqlite3WalLimit(Wal *pWal, i64 iLimit){
if( pWal ) pWal->mxWalSize = iLimit;
}
/*
** Find the smallest page number out of all pages held in the WAL that
** has not been returned by any prior invocation of this method on the
** same WalIterator object. Write into *piFrame the frame index where
** that page was last written into the WAL. Write into *piPage the page
** number.
**
** Return 0 on success. If there are no pages in the WAL with a page
** number larger than *piPage, then return 1.
*/
static int walIteratorNext(
WalIterator *p, /* Iterator */
u32 *piPage, /* OUT: The page number of the next page */
u32 *piFrame /* OUT: Wal frame index of next page */
){
u32 iMin; /* Result pgno must be greater than iMin */
u32 iRet = 0xFFFFFFFF; /* 0xffffffff is never a valid page number */
int i; /* For looping through segments */
iMin = p->iPrior;
assert( iMin<0xffffffff );
for(i=p->nSegment-1; i>=0; i--){
struct WalSegment *pSegment = &p->aSegment[i];
while( pSegment->iNext<pSegment->nEntry ){
u32 iPg = pSegment->aPgno[pSegment->aIndex[pSegment->iNext]];
if( iPg>iMin ){
if( iPg<iRet ){
iRet = iPg;
*piFrame = pSegment->iZero + pSegment->aIndex[pSegment->iNext];
}
break;
}
pSegment->iNext++;
}
}
*piPage = p->iPrior = iRet;
return (iRet==0xFFFFFFFF);
}
/*
** This function merges two sorted lists into a single sorted list.
**
** aLeft[] and aRight[] are arrays of indices. The sort key is
** aContent[aLeft[]] and aContent[aRight[]]. Upon entry, the following
** is guaranteed for all J<K:
**
** aContent[aLeft[J]] < aContent[aLeft[K]]
** aContent[aRight[J]] < aContent[aRight[K]]
**
** This routine overwrites aRight[] with a new (probably longer) sequence
** of indices such that the aRight[] contains every index that appears in
** either aLeft[] or the old aRight[] and such that the second condition
** above is still met.
**
** The aContent[aLeft[X]] values will be unique for all X. And the
** aContent[aRight[X]] values will be unique too. But there might be
** one or more combinations of X and Y such that
**
** aLeft[X]!=aRight[Y] && aContent[aLeft[X]] == aContent[aRight[Y]]
**
** When that happens, omit the aLeft[X] and use the aRight[Y] index.
*/
static void walMerge(
const u32 *aContent, /* Pages in wal - keys for the sort */
ht_slot *aLeft, /* IN: Left hand input list */
int nLeft, /* IN: Elements in array *paLeft */
ht_slot **paRight, /* IN/OUT: Right hand input list */
int *pnRight, /* IN/OUT: Elements in *paRight */
ht_slot *aTmp /* Temporary buffer */
){
int iLeft = 0; /* Current index in aLeft */
int iRight = 0; /* Current index in aRight */
int iOut = 0; /* Current index in output buffer */
int nRight = *pnRight;
ht_slot *aRight = *paRight;
assert( nLeft>0 && nRight>0 );
while( iRight<nRight || iLeft<nLeft ){
ht_slot logpage;
Pgno dbpage;
if( (iLeft<nLeft)
&& (iRight>=nRight || aContent[aLeft[iLeft]]<aContent[aRight[iRight]])
){
logpage = aLeft[iLeft++];
}else{
logpage = aRight[iRight++];
}
dbpage = aContent[logpage];
aTmp[iOut++] = logpage;
if( iLeft<nLeft && aContent[aLeft[iLeft]]==dbpage ) iLeft++;
assert( iLeft>=nLeft || aContent[aLeft[iLeft]]>dbpage );
assert( iRight>=nRight || aContent[aRight[iRight]]>dbpage );
}
*paRight = aLeft;
*pnRight = iOut;
memcpy(aLeft, aTmp, sizeof(aTmp[0])*iOut);
}
/*
** Sort the elements in list aList using aContent[] as the sort key.
** Remove elements with duplicate keys, preferring to keep the
** larger aList[] values.
**
** The aList[] entries are indices into aContent[]. The values in
** aList[] are to be sorted so that for all J<K:
**
** aContent[aList[J]] < aContent[aList[K]]
**
** For any X and Y such that
**
** aContent[aList[X]] == aContent[aList[Y]]
**
** Keep the larger of the two values aList[X] and aList[Y] and discard
** the smaller.
*/
static void walMergesort(
const u32 *aContent, /* Pages in wal */
ht_slot *aBuffer, /* Buffer of at least *pnList items to use */
ht_slot *aList, /* IN/OUT: List to sort */
int *pnList /* IN/OUT: Number of elements in aList[] */
){
struct Sublist {
int nList; /* Number of elements in aList */
ht_slot *aList; /* Pointer to sub-list content */
};
const int nList = *pnList; /* Size of input list */
int nMerge = 0; /* Number of elements in list aMerge */
ht_slot *aMerge = 0; /* List to be merged */
int iList; /* Index into input list */
u32 iSub = 0; /* Index into aSub array */
struct Sublist aSub[13]; /* Array of sub-lists */
memset(aSub, 0, sizeof(aSub));
assert( nList<=HASHTABLE_NPAGE && nList>0 );
assert( HASHTABLE_NPAGE==(1<<(ArraySize(aSub)-1)) );
for(iList=0; iList<nList; iList++){
nMerge = 1;
aMerge = &aList[iList];
for(iSub=0; iList & (1<<iSub); iSub++){
struct Sublist *p;
assert( iSub<ArraySize(aSub) );
p = &aSub[iSub];
assert( p->aList && p->nList<=(1<<iSub) );
assert( p->aList==&aList[iList&~((2<<iSub)-1)] );
walMerge(aContent, p->aList, p->nList, &aMerge, &nMerge, aBuffer);
}
aSub[iSub].aList = aMerge;
aSub[iSub].nList = nMerge;
}
for(iSub++; iSub<ArraySize(aSub); iSub++){
if( nList & (1<<iSub) ){
struct Sublist *p;
assert( iSub<ArraySize(aSub) );
p = &aSub[iSub];
assert( p->nList<=(1<<iSub) );
assert( p->aList==&aList[nList&~((2<<iSub)-1)] );
walMerge(aContent, p->aList, p->nList, &aMerge, &nMerge, aBuffer);
}
}
assert( aMerge==aList );
*pnList = nMerge;
#ifdef SQLITE_DEBUG
{
int i;
for(i=1; i<*pnList; i++){
assert( aContent[aList[i]] > aContent[aList[i-1]] );
}
}
#endif
}
/*
** Free an iterator allocated by walIteratorInit().
*/
static void walIteratorFree(WalIterator *p){
sqlite3_free(p);
}
/*
** Construct a WalInterator object that can be used to loop over all
** pages in the WAL following frame nBackfill in ascending order. Frames
** nBackfill or earlier may be included - excluding them is an optimization
** only. The caller must hold the checkpoint lock.
**
** On success, make *pp point to the newly allocated WalInterator object
** return SQLITE_OK. Otherwise, return an error code. If this routine
** returns an error, the value of *pp is undefined.
**
** The calling routine should invoke walIteratorFree() to destroy the
** WalIterator object when it has finished with it.
*/
static int walIteratorInit(Wal *pWal, u32 nBackfill, WalIterator **pp){
WalIterator *p; /* Return value */
int nSegment; /* Number of segments to merge */
u32 iLast; /* Last frame in log */
sqlite3_int64 nByte; /* Number of bytes to allocate */
int i; /* Iterator variable */
ht_slot *aTmp; /* Temp space used by merge-sort */
int rc = SQLITE_OK; /* Return Code */
/* This routine only runs while holding the checkpoint lock. And
** it only runs if there is actually content in the log (mxFrame>0).
*/
assert( pWal->ckptLock && pWal->hdr.mxFrame>0 );
iLast = pWal->hdr.mxFrame;
/* Allocate space for the WalIterator object. */
nSegment = walFramePage(iLast) + 1;
nByte = sizeof(WalIterator)
+ (nSegment-1)*sizeof(struct WalSegment)
+ iLast*sizeof(ht_slot);
p = (WalIterator *)sqlite3_malloc64(nByte);
if( !p ){
return SQLITE_NOMEM_BKPT;
}
memset(p, 0, nByte);
p->nSegment = nSegment;
/* Allocate temporary space used by the merge-sort routine. This block
** of memory will be freed before this function returns.
*/
aTmp = (ht_slot *)sqlite3_malloc64(
sizeof(ht_slot) * (iLast>HASHTABLE_NPAGE?HASHTABLE_NPAGE:iLast)
);
if( !aTmp ){
rc = SQLITE_NOMEM_BKPT;
}
for(i=walFramePage(nBackfill+1); rc==SQLITE_OK && i<nSegment; i++){
WalHashLoc sLoc;
rc = walHashGet(pWal, i, &sLoc);
if( rc==SQLITE_OK ){
int j; /* Counter variable */
int nEntry; /* Number of entries in this segment */
ht_slot *aIndex; /* Sorted index for this segment */
if( (i+1)==nSegment ){
nEntry = (int)(iLast - sLoc.iZero);
}else{
nEntry = (int)((u32*)sLoc.aHash - (u32*)sLoc.aPgno);
}
aIndex = &((ht_slot *)&p->aSegment[p->nSegment])[sLoc.iZero];
sLoc.iZero++;
for(j=0; j<nEntry; j++){
aIndex[j] = (ht_slot)j;
}
walMergesort((u32 *)sLoc.aPgno, aTmp, aIndex, &nEntry);
p->aSegment[i].iZero = sLoc.iZero;
p->aSegment[i].nEntry = nEntry;
p->aSegment[i].aIndex = aIndex;
p->aSegment[i].aPgno = (u32 *)sLoc.aPgno;
}
}
sqlite3_free(aTmp);
if( rc!=SQLITE_OK ){
walIteratorFree(p);
p = 0;
}
*pp = p;
return rc;
}
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
/*
** Attempt to enable blocking locks. Blocking locks are enabled only if (a)
** they are supported by the VFS, and (b) the database handle is configured
** with a busy-timeout. Return 1 if blocking locks are successfully enabled,
** or 0 otherwise.
*/
static int walEnableBlocking(Wal *pWal){
int res = 0;
if( pWal->db ){
int tmout = pWal->db->busyTimeout;
if( tmout ){
int rc;
rc = sqlite3OsFileControl(
pWal->pDbFd, SQLITE_FCNTL_LOCK_TIMEOUT, (void*)&tmout
);
res = (rc==SQLITE_OK);
}
}
return res;
}
/*
** Disable blocking locks.
*/
static void walDisableBlocking(Wal *pWal){
int tmout = 0;
sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_LOCK_TIMEOUT, (void*)&tmout);
}
/*
** If parameter bLock is true, attempt to enable blocking locks, take
** the WRITER lock, and then disable blocking locks. If blocking locks
** cannot be enabled, no attempt to obtain the WRITER lock is made. Return
** an SQLite error code if an error occurs, or SQLITE_OK otherwise. It is not
** an error if blocking locks can not be enabled.
**
** If the bLock parameter is false and the WRITER lock is held, release it.
*/
int sqlite3WalWriteLock(Wal *pWal, int bLock){
int rc = SQLITE_OK;
assert( pWal->readLock<0 || bLock==0 );
if( bLock ){
assert( pWal->db );
if( walEnableBlocking(pWal) ){
rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1);
if( rc==SQLITE_OK ){
pWal->writeLock = 1;
}
walDisableBlocking(pWal);
}
}else if( pWal->writeLock ){
walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
pWal->writeLock = 0;
}
return rc;
}
/*
** Set the database handle used to determine if blocking locks are required.
*/
void sqlite3WalDb(Wal *pWal, sqlite3 *db){
pWal->db = db;
}
/*
** Take an exclusive WRITE lock. Blocking if so configured.
*/
static int walLockWriter(Wal *pWal){
int rc;
walEnableBlocking(pWal);
rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1);
walDisableBlocking(pWal);
return rc;
}
#else
# define walEnableBlocking(x) 0
# define walDisableBlocking(x)
# define walLockWriter(pWal) walLockExclusive((pWal), WAL_WRITE_LOCK, 1)
# define sqlite3WalDb(pWal, db)
#endif /* ifdef SQLITE_ENABLE_SETLK_TIMEOUT */
/*
** Attempt to obtain the exclusive WAL lock defined by parameters lockIdx and
** n. If the attempt fails and parameter xBusy is not NULL, then it is a
** busy-handler function. Invoke it and retry the lock until either the
** lock is successfully obtained or the busy-handler returns 0.
*/
static int walBusyLock(
Wal *pWal, /* WAL connection */
int (*xBusy)(void*), /* Function to call when busy */
void *pBusyArg, /* Context argument for xBusyHandler */
int lockIdx, /* Offset of first byte to lock */
int n /* Number of bytes to lock */
){
int rc;
do {
rc = walLockExclusive(pWal, lockIdx, n);
}while( xBusy && rc==SQLITE_BUSY && xBusy(pBusyArg) );
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
if( rc==SQLITE_BUSY_TIMEOUT ){
walDisableBlocking(pWal);
rc = SQLITE_BUSY;
}
#endif
return rc;
}
/*
** The cache of the wal-index header must be valid to call this function.
** Return the page-size in bytes used by the database.
*/
static int walPagesize(Wal *pWal){
return (pWal->hdr.szPage&0xfe00) + ((pWal->hdr.szPage&0x0001)<<16);
}
/*
** The following is guaranteed when this function is called:
**
** a) the WRITER lock is held,
** b) the entire log file has been checkpointed, and
** c) any existing readers are reading exclusively from the database
** file - there are no readers that may attempt to read a frame from
** the log file.
**
** This function updates the shared-memory structures so that the next
** client to write to the database (which may be this one) does so by
** writing frames into the start of the log file.
**
** The value of parameter salt1 is used as the aSalt[1] value in the
** new wal-index header. It should be passed a pseudo-random value (i.e.
** one obtained from sqlite3_randomness()).
*/
static void walRestartHdr(Wal *pWal, u32 salt1){
volatile WalCkptInfo *pInfo = walCkptInfo(pWal);
int i; /* Loop counter */
u32 *aSalt = pWal->hdr.aSalt; /* Big-endian salt values */
pWal->nCkpt++;
pWal->hdr.mxFrame = 0;
sqlite3Put4byte((u8*)&aSalt[0], 1 + sqlite3Get4byte((u8*)&aSalt[0]));
memcpy(&pWal->hdr.aSalt[1], &salt1, 4);
walIndexWriteHdr(pWal);
AtomicStore(&pInfo->nBackfill, 0);
pInfo->nBackfillAttempted = 0;
pInfo->aReadMark[1] = 0;
for(i=2; i<WAL_NREADER; i++) pInfo->aReadMark[i] = READMARK_NOT_USED;
assert( pInfo->aReadMark[0]==0 );
}
/*
** Copy as much content as we can from the WAL back into the database file
** in response to an sqlite3_wal_checkpoint() request or the equivalent.
**
** The amount of information copies from WAL to database might be limited
** by active readers. This routine will never overwrite a database page
** that a concurrent reader might be using.
**
** All I/O barrier operations (a.k.a fsyncs) occur in this routine when
** SQLite is in WAL-mode in synchronous=NORMAL. That means that if
** checkpoints are always run by a background thread or background
** process, foreground threads will never block on a lengthy fsync call.
**
** Fsync is called on the WAL before writing content out of the WAL and
** into the database. This ensures that if the new content is persistent
** in the WAL and can be recovered following a power-loss or hard reset.
**
** Fsync is also called on the database file if (and only if) the entire
** WAL content is copied into the database file. This second fsync makes
** it safe to delete the WAL since the new content will persist in the
** database file.
**
** This routine uses and updates the nBackfill field of the wal-index header.
** This is the only routine that will increase the value of nBackfill.
** (A WAL reset or recovery will revert nBackfill to zero, but not increase
** its value.)
**
** The caller must be holding sufficient locks to ensure that no other
** checkpoint is running (in any other thread or process) at the same
** time.
*/
static int walCheckpoint(
Wal *pWal, /* Wal connection */
sqlite3 *db, /* Check for interrupts on this handle */
int eMode, /* One of PASSIVE, FULL or RESTART */
int (*xBusy)(void*), /* Function to call when busy */
void *pBusyArg, /* Context argument for xBusyHandler */
int sync_flags, /* Flags for OsSync() (or 0) */
u8 *zBuf /* Temporary buffer to use */
){
int rc = SQLITE_OK; /* Return code */
int szPage; /* Database page-size */
WalIterator *pIter = 0; /* Wal iterator context */
u32 iDbpage = 0; /* Next database page to write */
u32 iFrame = 0; /* Wal frame containing data for iDbpage */
u32 mxSafeFrame; /* Max frame that can be backfilled */
u32 mxPage; /* Max database page to write */
int i; /* Loop counter */
volatile WalCkptInfo *pInfo; /* The checkpoint status information */
szPage = walPagesize(pWal);
testcase( szPage<=32768 );
testcase( szPage>=65536 );
pInfo = walCkptInfo(pWal);
if( pInfo->nBackfill<pWal->hdr.mxFrame ){
/* EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
** in the SQLITE_CHECKPOINT_PASSIVE mode. */
assert( eMode!=SQLITE_CHECKPOINT_PASSIVE || xBusy==0 );
/* Compute in mxSafeFrame the index of the last frame of the WAL that is
** safe to write into the database. Frames beyond mxSafeFrame might
** overwrite database pages that are in use by active readers and thus
** cannot be backfilled from the WAL.
*/
mxSafeFrame = pWal->hdr.mxFrame;
mxPage = pWal->hdr.nPage;
for(i=1; i<WAL_NREADER; i++){
u32 y = AtomicLoad(pInfo->aReadMark+i);
if( mxSafeFrame>y ){
assert( y<=pWal->hdr.mxFrame );
rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(i), 1);
if( rc==SQLITE_OK ){
u32 iMark = (i==1 ? mxSafeFrame : READMARK_NOT_USED);
AtomicStore(pInfo->aReadMark+i, iMark);
walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
}else if( rc==SQLITE_BUSY ){
mxSafeFrame = y;
xBusy = 0;
}else{
goto walcheckpoint_out;
}
}
}
/* Allocate the iterator */
if( pInfo->nBackfill<mxSafeFrame ){
rc = walIteratorInit(pWal, pInfo->nBackfill, &pIter);
assert( rc==SQLITE_OK || pIter==0 );
}
if( pIter
&& (rc = walBusyLock(pWal,xBusy,pBusyArg,WAL_READ_LOCK(0),1))==SQLITE_OK
){
u32 nBackfill = pInfo->nBackfill;
pInfo->nBackfillAttempted = mxSafeFrame;
/* Sync the WAL to disk */
rc = sqlite3OsSync(pWal->pWalFd, CKPT_SYNC_FLAGS(sync_flags));
/* If the database may grow as a result of this checkpoint, hint
** about the eventual size of the db file to the VFS layer.
*/
if( rc==SQLITE_OK ){
i64 nReq = ((i64)mxPage * szPage);
i64 nSize; /* Current size of database file */
sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_START, 0);
rc = sqlite3OsFileSize(pWal->pDbFd, &nSize);
if( rc==SQLITE_OK && nSize<nReq ){
if( (nSize+65536+(i64)pWal->hdr.mxFrame*szPage)<nReq ){
/* If the size of the final database is larger than the current
** database plus the amount of data in the wal file, plus the
** maximum size of the pending-byte page (65536 bytes), then
** must be corruption somewhere. */
rc = SQLITE_CORRUPT_BKPT;
}else{
sqlite3OsFileControlHint(pWal->pDbFd, SQLITE_FCNTL_SIZE_HINT,&nReq);
}
}
}
/* Iterate through the contents of the WAL, copying data to the db file */
while( rc==SQLITE_OK && 0==walIteratorNext(pIter, &iDbpage, &iFrame) ){
i64 iOffset;
assert( walFramePgno(pWal, iFrame)==iDbpage );
if( AtomicLoad(&db->u1.isInterrupted) ){
rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_INTERRUPT;
break;
}
if( iFrame<=nBackfill || iFrame>mxSafeFrame || iDbpage>mxPage ){
continue;
}
iOffset = walFrameOffset(iFrame, szPage) + WAL_FRAME_HDRSIZE;
/* testcase( IS_BIG_INT(iOffset) ); // requires a 4GiB WAL file */
rc = sqlite3OsRead(pWal->pWalFd, zBuf, szPage, iOffset);
if( rc!=SQLITE_OK ) break;
iOffset = (iDbpage-1)*(i64)szPage;
testcase( IS_BIG_INT(iOffset) );
rc = sqlite3OsWrite(pWal->pDbFd, zBuf, szPage, iOffset);
if( rc!=SQLITE_OK ) break;
}
sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_DONE, 0);
/* If work was actually accomplished... */
if( rc==SQLITE_OK ){
if( mxSafeFrame==walIndexHdr(pWal)->mxFrame ){
i64 szDb = pWal->hdr.nPage*(i64)szPage;
testcase( IS_BIG_INT(szDb) );
rc = sqlite3OsTruncate(pWal->pDbFd, szDb);
if( rc==SQLITE_OK ){
rc = sqlite3OsSync(pWal->pDbFd, CKPT_SYNC_FLAGS(sync_flags));
}
}
if( rc==SQLITE_OK ){
AtomicStore(&pInfo->nBackfill, mxSafeFrame);
}
}
/* Release the reader lock held while backfilling */
walUnlockExclusive(pWal, WAL_READ_LOCK(0), 1);
}
if( rc==SQLITE_BUSY ){
/* Reset the return code so as not to report a checkpoint failure
** just because there are active readers. */
rc = SQLITE_OK;
}
}
/* If this is an SQLITE_CHECKPOINT_RESTART or TRUNCATE operation, and the
** entire wal file has been copied into the database file, then block
** until all readers have finished using the wal file. This ensures that
** the next process to write to the database restarts the wal file.
*/
if( rc==SQLITE_OK && eMode!=SQLITE_CHECKPOINT_PASSIVE ){
assert( pWal->writeLock );
if( pInfo->nBackfill<pWal->hdr.mxFrame ){
rc = SQLITE_BUSY;
}else if( eMode>=SQLITE_CHECKPOINT_RESTART ){
u32 salt1;
sqlite3_randomness(4, &salt1);
assert( pInfo->nBackfill==pWal->hdr.mxFrame );
rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(1), WAL_NREADER-1);
if( rc==SQLITE_OK ){
if( eMode==SQLITE_CHECKPOINT_TRUNCATE ){
/* IMPLEMENTATION-OF: R-44699-57140 This mode works the same way as
** SQLITE_CHECKPOINT_RESTART with the addition that it also
** truncates the log file to zero bytes just prior to a
** successful return.
**
** In theory, it might be safe to do this without updating the
** wal-index header in shared memory, as all subsequent reader or
** writer clients should see that the entire log file has been
** checkpointed and behave accordingly. This seems unsafe though,
** as it would leave the system in a state where the contents of
** the wal-index header do not match the contents of the
** file-system. To avoid this, update the wal-index header to
** indicate that the log file contains zero valid frames. */
walRestartHdr(pWal, salt1);
rc = sqlite3OsTruncate(pWal->pWalFd, 0);
}
walUnlockExclusive(pWal, WAL_READ_LOCK(1), WAL_NREADER-1);
}
}
}
walcheckpoint_out:
walIteratorFree(pIter);
return rc;
}
/*
** If the WAL file is currently larger than nMax bytes in size, truncate
** it to exactly nMax bytes. If an error occurs while doing so, ignore it.
*/
static void walLimitSize(Wal *pWal, i64 nMax){
i64 sz;
int rx;
sqlite3BeginBenignMalloc();
rx = sqlite3OsFileSize(pWal->pWalFd, &sz);
if( rx==SQLITE_OK && (sz > nMax ) ){
rx = sqlite3OsTruncate(pWal->pWalFd, nMax);
}
sqlite3EndBenignMalloc();
if( rx ){
sqlite3_log(rx, "cannot limit WAL size: %s", pWal->zWalName);
}
}
/*
** Close a connection to a log file.
*/
int sqlite3WalClose(
Wal *pWal, /* Wal to close */
sqlite3 *db, /* For interrupt flag */
int sync_flags, /* Flags to pass to OsSync() (or 0) */
int nBuf,
u8 *zBuf /* Buffer of at least nBuf bytes */
){
int rc = SQLITE_OK;
if( pWal ){
int isDelete = 0; /* True to unlink wal and wal-index files */
/* If an EXCLUSIVE lock can be obtained on the database file (using the
** ordinary, rollback-mode locking methods, this guarantees that the
** connection associated with this log file is the only connection to
** the database. In this case checkpoint the database and unlink both
** the wal and wal-index files.
**
** The EXCLUSIVE lock is not released before returning.
*/
if( zBuf!=0
&& SQLITE_OK==(rc = sqlite3OsLock(pWal->pDbFd, SQLITE_LOCK_EXCLUSIVE))
){
if( pWal->exclusiveMode==WAL_NORMAL_MODE ){
pWal->exclusiveMode = WAL_EXCLUSIVE_MODE;
}
rc = sqlite3WalCheckpoint(pWal, db,
SQLITE_CHECKPOINT_PASSIVE, 0, 0, sync_flags, nBuf, zBuf, 0, 0
);
if( rc==SQLITE_OK ){
int bPersist = -1;
sqlite3OsFileControlHint(
pWal->pDbFd, SQLITE_FCNTL_PERSIST_WAL, &bPersist
);
if( bPersist!=1 ){
/* Try to delete the WAL file if the checkpoint completed and
** fsyned (rc==SQLITE_OK) and if we are not in persistent-wal
** mode (!bPersist) */
isDelete = 1;
}else if( pWal->mxWalSize>=0 ){
/* Try to truncate the WAL file to zero bytes if the checkpoint
** completed and fsynced (rc==SQLITE_OK) and we are in persistent
** WAL mode (bPersist) and if the PRAGMA journal_size_limit is a
** non-negative value (pWal->mxWalSize>=0). Note that we truncate
** to zero bytes as truncating to the journal_size_limit might
** leave a corrupt WAL file on disk. */
walLimitSize(pWal, 0);
}
}
}
walIndexClose(pWal, isDelete);
sqlite3OsClose(pWal->pWalFd);
if( isDelete ){
sqlite3BeginBenignMalloc();
sqlite3OsDelete(pWal->pVfs, pWal->zWalName, 0);
sqlite3EndBenignMalloc();
}
WALTRACE(("WAL%p: closed\n", pWal));
sqlite3_free((void *)pWal->apWiData);
sqlite3_free(pWal);
}
return rc;
}
/*
** Try to read the wal-index header. Return 0 on success and 1 if
** there is a problem.
**
** The wal-index is in shared memory. Another thread or process might
** be writing the header at the same time this procedure is trying to
** read it, which might result in inconsistency. A dirty read is detected
** by verifying that both copies of the header are the same and also by
** a checksum on the header.
**
** If and only if the read is consistent and the header is different from
** pWal->hdr, then pWal->hdr is updated to the content of the new header
** and *pChanged is set to 1.
**
** If the checksum cannot be verified return non-zero. If the header
** is read successfully and the checksum verified, return zero.
*/
static SQLITE_NO_TSAN int walIndexTryHdr(Wal *pWal, int *pChanged){
u32 aCksum[2]; /* Checksum on the header content */
WalIndexHdr h1, h2; /* Two copies of the header content */
WalIndexHdr volatile *aHdr; /* Header in shared memory */
/* The first page of the wal-index must be mapped at this point. */
assert( pWal->nWiData>0 && pWal->apWiData[0] );
/* Read the header. This might happen concurrently with a write to the
** same area of shared memory on a different CPU in a SMP,
** meaning it is possible that an inconsistent snapshot is read
** from the file. If this happens, return non-zero.
**
** tag-20200519-1:
** There are two copies of the header at the beginning of the wal-index.
** When reading, read [0] first then [1]. Writes are in the reverse order.
** Memory barriers are used to prevent the compiler or the hardware from
** reordering the reads and writes. TSAN and similar tools can sometimes
** give false-positive warnings about these accesses because the tools do not
** account for the double-read and the memory barrier. The use of mutexes
** here would be problematic as the memory being accessed is potentially
** shared among multiple processes and not all mutex implementions work
** reliably in that environment.
*/
aHdr = walIndexHdr(pWal);
memcpy(&h1, (void *)&aHdr[0], sizeof(h1)); /* Possible TSAN false-positive */
walShmBarrier(pWal);
memcpy(&h2, (void *)&aHdr[1], sizeof(h2));
if( memcmp(&h1, &h2, sizeof(h1))!=0 ){
return 1; /* Dirty read */
}
if( h1.isInit==0 ){
return 1; /* Malformed header - probably all zeros */
}
walChecksumBytes(1, (u8*)&h1, sizeof(h1)-sizeof(h1.aCksum), 0, aCksum);
if( aCksum[0]!=h1.aCksum[0] || aCksum[1]!=h1.aCksum[1] ){
return 1; /* Checksum does not match */
}
if( memcmp(&pWal->hdr, &h1, sizeof(WalIndexHdr)) ){
*pChanged = 1;
memcpy(&pWal->hdr, &h1, sizeof(WalIndexHdr));
pWal->szPage = (pWal->hdr.szPage&0xfe00) + ((pWal->hdr.szPage&0x0001)<<16);
testcase( pWal->szPage<=32768 );
testcase( pWal->szPage>=65536 );
}
/* The header was successfully read. Return zero. */
return 0;
}
/*
** This is the value that walTryBeginRead returns when it needs to
** be retried.
*/
#define WAL_RETRY (-1)
/*
** Read the wal-index header from the wal-index and into pWal->hdr.
** If the wal-header appears to be corrupt, try to reconstruct the
** wal-index from the WAL before returning.
**
** Set *pChanged to 1 if the wal-index header value in pWal->hdr is
** changed by this operation. If pWal->hdr is unchanged, set *pChanged
** to 0.
**
** If the wal-index header is successfully read, return SQLITE_OK.
** Otherwise an SQLite error code.
*/
static int walIndexReadHdr(Wal *pWal, int *pChanged){
int rc; /* Return code */
int badHdr; /* True if a header read failed */
volatile u32 *page0; /* Chunk of wal-index containing header */
/* Ensure that page 0 of the wal-index (the page that contains the
** wal-index header) is mapped. Return early if an error occurs here.
*/
assert( pChanged );
rc = walIndexPage(pWal, 0, &page0);
if( rc!=SQLITE_OK ){
assert( rc!=SQLITE_READONLY ); /* READONLY changed to OK in walIndexPage */
if( rc==SQLITE_READONLY_CANTINIT ){
/* The SQLITE_READONLY_CANTINIT return means that the shared-memory
** was openable but is not writable, and this thread is unable to
** confirm that another write-capable connection has the shared-memory
** open, and hence the content of the shared-memory is unreliable,
** since the shared-memory might be inconsistent with the WAL file
** and there is no writer on hand to fix it. */
assert( page0==0 );
assert( pWal->writeLock==0 );
assert( pWal->readOnly & WAL_SHM_RDONLY );
pWal->bShmUnreliable = 1;
pWal->exclusiveMode = WAL_HEAPMEMORY_MODE;
*pChanged = 1;
}else{
return rc; /* Any other non-OK return is just an error */
}
}else{
/* page0 can be NULL if the SHM is zero bytes in size and pWal->writeLock
** is zero, which prevents the SHM from growing */
testcase( page0!=0 );
}
assert( page0!=0 || pWal->writeLock==0 );
/* If the first page of the wal-index has been mapped, try to read the
** wal-index header immediately, without holding any lock. This usually
** works, but may fail if the wal-index header is corrupt or currently
** being modified by another thread or process.
*/
badHdr = (page0 ? walIndexTryHdr(pWal, pChanged) : 1);
/* If the first attempt failed, it might have been due to a race
** with a writer. So get a WRITE lock and try again.
*/
if( badHdr ){
if( pWal->bShmUnreliable==0 && (pWal->readOnly & WAL_SHM_RDONLY) ){
if( SQLITE_OK==(rc = walLockShared(pWal, WAL_WRITE_LOCK)) ){
walUnlockShared(pWal, WAL_WRITE_LOCK);
rc = SQLITE_READONLY_RECOVERY;
}
}else{
int bWriteLock = pWal->writeLock;
if( bWriteLock || SQLITE_OK==(rc = walLockWriter(pWal)) ){
pWal->writeLock = 1;
if( SQLITE_OK==(rc = walIndexPage(pWal, 0, &page0)) ){
badHdr = walIndexTryHdr(pWal, pChanged);
if( badHdr ){
/* If the wal-index header is still malformed even while holding
** a WRITE lock, it can only mean that the header is corrupted and
** needs to be reconstructed. So run recovery to do exactly that.
*/
rc = walIndexRecover(pWal);
*pChanged = 1;
}
}
if( bWriteLock==0 ){
pWal->writeLock = 0;
walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
}
}
}
}
/* If the header is read successfully, check the version number to make
** sure the wal-index was not constructed with some future format that
** this version of SQLite cannot understand.
*/
if( badHdr==0 && pWal->hdr.iVersion!=WALINDEX_MAX_VERSION ){
rc = SQLITE_CANTOPEN_BKPT;
}
if( pWal->bShmUnreliable ){
if( rc!=SQLITE_OK ){
walIndexClose(pWal, 0);
pWal->bShmUnreliable = 0;
assert( pWal->nWiData>0 && pWal->apWiData[0]==0 );
/* walIndexRecover() might have returned SHORT_READ if a concurrent
** writer truncated the WAL out from under it. If that happens, it
** indicates that a writer has fixed the SHM file for us, so retry */
if( rc==SQLITE_IOERR_SHORT_READ ) rc = WAL_RETRY;
}
pWal->exclusiveMode = WAL_NORMAL_MODE;
}
return rc;
}
/*
** Open a transaction in a connection where the shared-memory is read-only
** and where we cannot verify that there is a separate write-capable connection
** on hand to keep the shared-memory up-to-date with the WAL file.
**
** This can happen, for example, when the shared-memory is implemented by
** memory-mapping a *-shm file, where a prior writer has shut down and
** left the *-shm file on disk, and now the present connection is trying
** to use that database but lacks write permission on the *-shm file.
** Other scenarios are also possible, depending on the VFS implementation.
**
** Precondition:
**
** The *-wal file has been read and an appropriate wal-index has been
** constructed in pWal->apWiData[] using heap memory instead of shared
** memory.
**
** If this function returns SQLITE_OK, then the read transaction has
** been successfully opened. In this case output variable (*pChanged)
** is set to true before returning if the caller should discard the
** contents of the page cache before proceeding. Or, if it returns
** WAL_RETRY, then the heap memory wal-index has been discarded and
** the caller should retry opening the read transaction from the
** beginning (including attempting to map the *-shm file).
**
** If an error occurs, an SQLite error code is returned.
*/
static int walBeginShmUnreliable(Wal *pWal, int *pChanged){
i64 szWal; /* Size of wal file on disk in bytes */
i64 iOffset; /* Current offset when reading wal file */
u8 aBuf[WAL_HDRSIZE]; /* Buffer to load WAL header into */
u8 *aFrame = 0; /* Malloc'd buffer to load entire frame */
int szFrame; /* Number of bytes in buffer aFrame[] */
u8 *aData; /* Pointer to data part of aFrame buffer */
volatile void *pDummy; /* Dummy argument for xShmMap */
int rc; /* Return code */
u32 aSaveCksum[2]; /* Saved copy of pWal->hdr.aFrameCksum */
assert( pWal->bShmUnreliable );
assert( pWal->readOnly & WAL_SHM_RDONLY );
assert( pWal->nWiData>0 && pWal->apWiData[0] );
/* Take WAL_READ_LOCK(0). This has the effect of preventing any
** writers from running a checkpoint, but does not stop them
** from running recovery. */
rc = walLockShared(pWal, WAL_READ_LOCK(0));
if( rc!=SQLITE_OK ){
if( rc==SQLITE_BUSY ) rc = WAL_RETRY;
goto begin_unreliable_shm_out;
}
pWal->readLock = 0;
/* Check to see if a separate writer has attached to the shared-memory area,
** thus making the shared-memory "reliable" again. Do this by invoking
** the xShmMap() routine of the VFS and looking to see if the return
** is SQLITE_READONLY instead of SQLITE_READONLY_CANTINIT.
**
** If the shared-memory is now "reliable" return WAL_RETRY, which will
** cause the heap-memory WAL-index to be discarded and the actual
** shared memory to be used in its place.
**
** This step is important because, even though this connection is holding
** the WAL_READ_LOCK(0) which prevents a checkpoint, a writer might
** have already checkpointed the WAL file and, while the current
** is active, wrap the WAL and start overwriting frames that this
** process wants to use.
**
** Once sqlite3OsShmMap() has been called for an sqlite3_file and has
** returned any SQLITE_READONLY value, it must return only SQLITE_READONLY
** or SQLITE_READONLY_CANTINIT or some error for all subsequent invocations,
** even if some external agent does a "chmod" to make the shared-memory
** writable by us, until sqlite3OsShmUnmap() has been called.
** This is a requirement on the VFS implementation.
*/
rc = sqlite3OsShmMap(pWal->pDbFd, 0, WALINDEX_PGSZ, 0, &pDummy);
assert( rc!=SQLITE_OK ); /* SQLITE_OK not possible for read-only connection */
if( rc!=SQLITE_READONLY_CANTINIT ){
rc = (rc==SQLITE_READONLY ? WAL_RETRY : rc);
goto begin_unreliable_shm_out;
}
/* We reach this point only if the real shared-memory is still unreliable.
** Assume the in-memory WAL-index substitute is correct and load it
** into pWal->hdr.
*/
memcpy(&pWal->hdr, (void*)walIndexHdr(pWal), sizeof(WalIndexHdr));
/* Make sure some writer hasn't come in and changed the WAL file out
** from under us, then disconnected, while we were not looking.
*/
rc = sqlite3OsFileSize(pWal->pWalFd, &szWal);
if( rc!=SQLITE_OK ){
goto begin_unreliable_shm_out;
}
if( szWal<WAL_HDRSIZE ){
/* If the wal file is too small to contain a wal-header and the
** wal-index header has mxFrame==0, then it must be safe to proceed
** reading the database file only. However, the page cache cannot
** be trusted, as a read/write connection may have connected, written
** the db, run a checkpoint, truncated the wal file and disconnected
** since this client's last read transaction. */
*pChanged = 1;
rc = (pWal->hdr.mxFrame==0 ? SQLITE_OK : WAL_RETRY);
goto begin_unreliable_shm_out;
}
/* Check the salt keys at the start of the wal file still match. */
rc = sqlite3OsRead(pWal->pWalFd, aBuf, WAL_HDRSIZE, 0);
if( rc!=SQLITE_OK ){
goto begin_unreliable_shm_out;
}
if( memcmp(&pWal->hdr.aSalt, &aBuf[16], 8) ){
/* Some writer has wrapped the WAL file while we were not looking.
** Return WAL_RETRY which will cause the in-memory WAL-index to be
** rebuilt. */
rc = WAL_RETRY;
goto begin_unreliable_shm_out;
}
/* Allocate a buffer to read frames into */
assert( (pWal->szPage & (pWal->szPage-1))==0 );
assert( pWal->szPage>=512 && pWal->szPage<=65536 );
szFrame = pWal->szPage + WAL_FRAME_HDRSIZE;
aFrame = (u8 *)sqlite3_malloc64(szFrame);
if( aFrame==0 ){
rc = SQLITE_NOMEM_BKPT;
goto begin_unreliable_shm_out;
}
aData = &aFrame[WAL_FRAME_HDRSIZE];
/* Check to see if a complete transaction has been appended to the
** wal file since the heap-memory wal-index was created. If so, the
** heap-memory wal-index is discarded and WAL_RETRY returned to
** the caller. */
aSaveCksum[0] = pWal->hdr.aFrameCksum[0];
aSaveCksum[1] = pWal->hdr.aFrameCksum[1];
for(iOffset=walFrameOffset(pWal->hdr.mxFrame+1, pWal->szPage);
iOffset+szFrame<=szWal;
iOffset+=szFrame
){
u32 pgno; /* Database page number for frame */
u32 nTruncate; /* dbsize field from frame header */
/* Read and decode the next log frame. */
rc = sqlite3OsRead(pWal->pWalFd, aFrame, szFrame, iOffset);
if( rc!=SQLITE_OK ) break;
if( !walDecodeFrame(pWal, &pgno, &nTruncate, aData, aFrame) ) break;
/* If nTruncate is non-zero, then a complete transaction has been
** appended to this wal file. Set rc to WAL_RETRY and break out of
** the loop. */
if( nTruncate ){
rc = WAL_RETRY;
break;
}
}
pWal->hdr.aFrameCksum[0] = aSaveCksum[0];
pWal->hdr.aFrameCksum[1] = aSaveCksum[1];
begin_unreliable_shm_out:
sqlite3_free(aFrame);
if( rc!=SQLITE_OK ){
int i;
for(i=0; i<pWal->nWiData; i++){
sqlite3_free((void*)pWal->apWiData[i]);
pWal->apWiData[i] = 0;
}
pWal->bShmUnreliable = 0;
sqlite3WalEndReadTransaction(pWal);
*pChanged = 1;
}
return rc;
}
/*
** Attempt to start a read transaction. This might fail due to a race or
** other transient condition. When that happens, it returns WAL_RETRY to
** indicate to the caller that it is safe to retry immediately.
**
** On success return SQLITE_OK. On a permanent failure (such an
** I/O error or an SQLITE_BUSY because another process is running
** recovery) return a positive error code.
**
** The useWal parameter is true to force the use of the WAL and disable
** the case where the WAL is bypassed because it has been completely
** checkpointed. If useWal==0 then this routine calls walIndexReadHdr()
** to make a copy of the wal-index header into pWal->hdr. If the
** wal-index header has changed, *pChanged is set to 1 (as an indication
** to the caller that the local page cache is obsolete and needs to be
** flushed.) When useWal==1, the wal-index header is assumed to already
** be loaded and the pChanged parameter is unused.
**
** The caller must set the cnt parameter to the number of prior calls to
** this routine during the current read attempt that returned WAL_RETRY.
** This routine will start taking more aggressive measures to clear the
** race conditions after multiple WAL_RETRY returns, and after an excessive
** number of errors will ultimately return SQLITE_PROTOCOL. The
** SQLITE_PROTOCOL return indicates that some other process has gone rogue
** and is not honoring the locking protocol. There is a vanishingly small
** chance that SQLITE_PROTOCOL could be returned because of a run of really
** bad luck when there is lots of contention for the wal-index, but that
** possibility is so small that it can be safely neglected, we believe.
**
** On success, this routine obtains a read lock on
** WAL_READ_LOCK(pWal->readLock). The pWal->readLock integer is
** in the range 0 <= pWal->readLock < WAL_NREADER. If pWal->readLock==(-1)
** that means the Wal does not hold any read lock. The reader must not
** access any database page that is modified by a WAL frame up to and
** including frame number aReadMark[pWal->readLock]. The reader will
** use WAL frames up to and including pWal->hdr.mxFrame if pWal->readLock>0
** Or if pWal->readLock==0, then the reader will ignore the WAL
** completely and get all content directly from the database file.
** If the useWal parameter is 1 then the WAL will never be ignored and
** this routine will always set pWal->readLock>0 on success.
** When the read transaction is completed, the caller must release the
** lock on WAL_READ_LOCK(pWal->readLock) and set pWal->readLock to -1.
**
** This routine uses the nBackfill and aReadMark[] fields of the header
** to select a particular WAL_READ_LOCK() that strives to let the
** checkpoint process do as much work as possible. This routine might
** update values of the aReadMark[] array in the header, but if it does
** so it takes care to hold an exclusive lock on the corresponding
** WAL_READ_LOCK() while changing values.
*/
static int walTryBeginRead(Wal *pWal, int *pChanged, int useWal, int cnt){
volatile WalCkptInfo *pInfo; /* Checkpoint information in wal-index */
u32 mxReadMark; /* Largest aReadMark[] value */
int mxI; /* Index of largest aReadMark[] value */
int i; /* Loop counter */
int rc = SQLITE_OK; /* Return code */
u32 mxFrame; /* Wal frame to lock to */
assert( pWal->readLock<0 ); /* Not currently locked */
/* useWal may only be set for read/write connections */
assert( (pWal->readOnly & WAL_SHM_RDONLY)==0 || useWal==0 );
/* Take steps to avoid spinning forever if there is a protocol error.
**
** Circumstances that cause a RETRY should only last for the briefest
** instances of time. No I/O or other system calls are done while the
** locks are held, so the locks should not be held for very long. But
** if we are unlucky, another process that is holding a lock might get
** paged out or take a page-fault that is time-consuming to resolve,
** during the few nanoseconds that it is holding the lock. In that case,
** it might take longer than normal for the lock to free.
**
** After 5 RETRYs, we begin calling sqlite3OsSleep(). The first few
** calls to sqlite3OsSleep() have a delay of 1 microsecond. Really this
** is more of a scheduler yield than an actual delay. But on the 10th
** an subsequent retries, the delays start becoming longer and longer,
** so that on the 100th (and last) RETRY we delay for 323 milliseconds.
** The total delay time before giving up is less than 10 seconds.
*/
if( cnt>5 ){
int nDelay = 1; /* Pause time in microseconds */
if( cnt>100 ){
VVA_ONLY( pWal->lockError = 1; )
return SQLITE_PROTOCOL;
}
if( cnt>=10 ) nDelay = (cnt-9)*(cnt-9)*39;
sqlite3OsSleep(pWal->pVfs, nDelay);
}
if( !useWal ){
assert( rc==SQLITE_OK );
if( pWal->bShmUnreliable==0 ){
rc = walIndexReadHdr(pWal, pChanged);
}
if( rc==SQLITE_BUSY ){
/* If there is not a recovery running in another thread or process
** then convert BUSY errors to WAL_RETRY. If recovery is known to
** be running, convert BUSY to BUSY_RECOVERY. There is a race here
** which might cause WAL_RETRY to be returned even if BUSY_RECOVERY
** would be technically correct. But the race is benign since with
** WAL_RETRY this routine will be called again and will probably be
** right on the second iteration.
*/
if( pWal->apWiData[0]==0 ){
/* This branch is taken when the xShmMap() method returns SQLITE_BUSY.
** We assume this is a transient condition, so return WAL_RETRY. The
** xShmMap() implementation used by the default unix and win32 VFS
** modules may return SQLITE_BUSY due to a race condition in the
** code that determines whether or not the shared-memory region
** must be zeroed before the requested page is returned.
*/
rc = WAL_RETRY;
}else if( SQLITE_OK==(rc = walLockShared(pWal, WAL_RECOVER_LOCK)) ){
walUnlockShared(pWal, WAL_RECOVER_LOCK);
rc = WAL_RETRY;
}else if( rc==SQLITE_BUSY ){
rc = SQLITE_BUSY_RECOVERY;
}
}
if( rc!=SQLITE_OK ){
return rc;
}
else if( pWal->bShmUnreliable ){
return walBeginShmUnreliable(pWal, pChanged);
}
}
assert( pWal->nWiData>0 );
assert( pWal->apWiData[0]!=0 );
pInfo = walCkptInfo(pWal);
if( !useWal && AtomicLoad(&pInfo->nBackfill)==pWal->hdr.mxFrame
#ifdef SQLITE_ENABLE_SNAPSHOT
&& (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0)
#endif
){
/* The WAL has been completely backfilled (or it is empty).
** and can be safely ignored.
*/
rc = walLockShared(pWal, WAL_READ_LOCK(0));
walShmBarrier(pWal);
if( rc==SQLITE_OK ){
if( memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr)) ){
/* It is not safe to allow the reader to continue here if frames
** may have been appended to the log before READ_LOCK(0) was obtained.
** When holding READ_LOCK(0), the reader ignores the entire log file,
** which implies that the database file contains a trustworthy
** snapshot. Since holding READ_LOCK(0) prevents a checkpoint from
** happening, this is usually correct.
**
** However, if frames have been appended to the log (or if the log
** is wrapped and written for that matter) before the READ_LOCK(0)
** is obtained, that is not necessarily true. A checkpointer may
** have started to backfill the appended frames but crashed before
** it finished. Leaving a corrupt image in the database file.
*/
walUnlockShared(pWal, WAL_READ_LOCK(0));
return WAL_RETRY;
}
pWal->readLock = 0;
return SQLITE_OK;
}else if( rc!=SQLITE_BUSY ){
return rc;
}
}
/* If we get this far, it means that the reader will want to use
** the WAL to get at content from recent commits. The job now is
** to select one of the aReadMark[] entries that is closest to
** but not exceeding pWal->hdr.mxFrame and lock that entry.
*/
mxReadMark = 0;
mxI = 0;
mxFrame = pWal->hdr.mxFrame;
#ifdef SQLITE_ENABLE_SNAPSHOT
if( pWal->pSnapshot && pWal->pSnapshot->mxFrame<mxFrame ){
mxFrame = pWal->pSnapshot->mxFrame;
}
#endif
for(i=1; i<WAL_NREADER; i++){
u32 thisMark = AtomicLoad(pInfo->aReadMark+i);
if( mxReadMark<=thisMark && thisMark<=mxFrame ){
assert( thisMark!=READMARK_NOT_USED );
mxReadMark = thisMark;
mxI = i;
}
}
if( (pWal->readOnly & WAL_SHM_RDONLY)==0
&& (mxReadMark<mxFrame || mxI==0)
){
for(i=1; i<WAL_NREADER; i++){
rc = walLockExclusive(pWal, WAL_READ_LOCK(i), 1);
if( rc==SQLITE_OK ){
AtomicStore(pInfo->aReadMark+i,mxFrame);
mxReadMark = mxFrame;
mxI = i;
walUnlockExclusive(pWal, WAL_READ_LOCK(i), 1);
break;
}else if( rc!=SQLITE_BUSY ){
return rc;
}
}
}
if( mxI==0 ){
assert( rc==SQLITE_BUSY || (pWal->readOnly & WAL_SHM_RDONLY)!=0 );
return rc==SQLITE_BUSY ? WAL_RETRY : SQLITE_READONLY_CANTINIT;
}
rc = walLockShared(pWal, WAL_READ_LOCK(mxI));
if( rc ){
return rc==SQLITE_BUSY ? WAL_RETRY : rc;
}
/* Now that the read-lock has been obtained, check that neither the
** value in the aReadMark[] array or the contents of the wal-index
** header have changed.
**
** It is necessary to check that the wal-index header did not change
** between the time it was read and when the shared-lock was obtained
** on WAL_READ_LOCK(mxI) was obtained to account for the possibility
** that the log file may have been wrapped by a writer, or that frames
** that occur later in the log than pWal->hdr.mxFrame may have been
** copied into the database by a checkpointer. If either of these things
** happened, then reading the database with the current value of
** pWal->hdr.mxFrame risks reading a corrupted snapshot. So, retry
** instead.
**
** Before checking that the live wal-index header has not changed
** since it was read, set Wal.minFrame to the first frame in the wal
** file that has not yet been checkpointed. This client will not need
** to read any frames earlier than minFrame from the wal file - they
** can be safely read directly from the database file.
**
** Because a ShmBarrier() call is made between taking the copy of
** nBackfill and checking that the wal-header in shared-memory still
** matches the one cached in pWal->hdr, it is guaranteed that the
** checkpointer that set nBackfill was not working with a wal-index
** header newer than that cached in pWal->hdr. If it were, that could
** cause a problem. The checkpointer could omit to checkpoint
** a version of page X that lies before pWal->minFrame (call that version
** A) on the basis that there is a newer version (version B) of the same
** page later in the wal file. But if version B happens to like past
** frame pWal->hdr.mxFrame - then the client would incorrectly assume
** that it can read version A from the database file. However, since
** we can guarantee that the checkpointer that set nBackfill could not
** see any pages past pWal->hdr.mxFrame, this problem does not come up.
*/
pWal->minFrame = AtomicLoad(&pInfo->nBackfill)+1;
walShmBarrier(pWal);
if( AtomicLoad(pInfo->aReadMark+mxI)!=mxReadMark
|| memcmp((void *)walIndexHdr(pWal), &pWal->hdr, sizeof(WalIndexHdr))
){
walUnlockShared(pWal, WAL_READ_LOCK(mxI));
return WAL_RETRY;
}else{
assert( mxReadMark<=pWal->hdr.mxFrame );
pWal->readLock = (i16)mxI;
}
return rc;
}
#ifdef SQLITE_ENABLE_SNAPSHOT
/*
** Attempt to reduce the value of the WalCkptInfo.nBackfillAttempted
** variable so that older snapshots can be accessed. To do this, loop
** through all wal frames from nBackfillAttempted to (nBackfill+1),
** comparing their content to the corresponding page with the database
** file, if any. Set nBackfillAttempted to the frame number of the
** first frame for which the wal file content matches the db file.
**
** This is only really safe if the file-system is such that any page
** writes made by earlier checkpointers were atomic operations, which
** is not always true. It is also possible that nBackfillAttempted
** may be left set to a value larger than expected, if a wal frame
** contains content that duplicate of an earlier version of the same
** page.
**
** SQLITE_OK is returned if successful, or an SQLite error code if an
** error occurs. It is not an error if nBackfillAttempted cannot be
** decreased at all.
*/
int sqlite3WalSnapshotRecover(Wal *pWal){
int rc;
assert( pWal->readLock>=0 );
rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1);
if( rc==SQLITE_OK ){
volatile WalCkptInfo *pInfo = walCkptInfo(pWal);
int szPage = (int)pWal->szPage;
i64 szDb; /* Size of db file in bytes */
rc = sqlite3OsFileSize(pWal->pDbFd, &szDb);
if( rc==SQLITE_OK ){
void *pBuf1 = sqlite3_malloc(szPage);
void *pBuf2 = sqlite3_malloc(szPage);
if( pBuf1==0 || pBuf2==0 ){
rc = SQLITE_NOMEM;
}else{
u32 i = pInfo->nBackfillAttempted;
for(i=pInfo->nBackfillAttempted; i>AtomicLoad(&pInfo->nBackfill); i--){
WalHashLoc sLoc; /* Hash table location */
u32 pgno; /* Page number in db file */
i64 iDbOff; /* Offset of db file entry */
i64 iWalOff; /* Offset of wal file entry */
rc = walHashGet(pWal, walFramePage(i), &sLoc);
if( rc!=SQLITE_OK ) break;
assert( i - sLoc.iZero - 1 >=0 );
pgno = sLoc.aPgno[i-sLoc.iZero-1];
iDbOff = (i64)(pgno-1) * szPage;
if( iDbOff+szPage<=szDb ){
iWalOff = walFrameOffset(i, szPage) + WAL_FRAME_HDRSIZE;
rc = sqlite3OsRead(pWal->pWalFd, pBuf1, szPage, iWalOff);
if( rc==SQLITE_OK ){
rc = sqlite3OsRead(pWal->pDbFd, pBuf2, szPage, iDbOff);
}
if( rc!=SQLITE_OK || 0==memcmp(pBuf1, pBuf2, szPage) ){
break;
}
}
pInfo->nBackfillAttempted = i-1;
}
}
sqlite3_free(pBuf1);
sqlite3_free(pBuf2);
}
walUnlockExclusive(pWal, WAL_CKPT_LOCK, 1);
}
return rc;
}
#endif /* SQLITE_ENABLE_SNAPSHOT */
/*
** Begin a read transaction on the database.
**
** This routine used to be called sqlite3OpenSnapshot() and with good reason:
** it takes a snapshot of the state of the WAL and wal-index for the current
** instant in time. The current thread will continue to use this snapshot.
** Other threads might append new content to the WAL and wal-index but
** that extra content is ignored by the current thread.
**
** If the database contents have changes since the previous read
** transaction, then *pChanged is set to 1 before returning. The
** Pager layer will use this to know that its cache is stale and
** needs to be flushed.
*/
int sqlite3WalBeginReadTransaction(Wal *pWal, int *pChanged){
int rc; /* Return code */
int cnt = 0; /* Number of TryBeginRead attempts */
#ifdef SQLITE_ENABLE_SNAPSHOT
int bChanged = 0;
WalIndexHdr *pSnapshot = pWal->pSnapshot;
#endif
assert( pWal->ckptLock==0 );
#ifdef SQLITE_ENABLE_SNAPSHOT
if( pSnapshot ){
if( memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){
bChanged = 1;
}
/* It is possible that there is a checkpointer thread running
** concurrent with this code. If this is the case, it may be that the
** checkpointer has already determined that it will checkpoint
** snapshot X, where X is later in the wal file than pSnapshot, but
** has not yet set the pInfo->nBackfillAttempted variable to indicate
** its intent. To avoid the race condition this leads to, ensure that
** there is no checkpointer process by taking a shared CKPT lock
** before checking pInfo->nBackfillAttempted. */
(void)walEnableBlocking(pWal);
rc = walLockShared(pWal, WAL_CKPT_LOCK);
walDisableBlocking(pWal);
if( rc!=SQLITE_OK ){
return rc;
}
pWal->ckptLock = 1;
}
#endif
do{
rc = walTryBeginRead(pWal, pChanged, 0, ++cnt);
}while( rc==WAL_RETRY );
testcase( (rc&0xff)==SQLITE_BUSY );
testcase( (rc&0xff)==SQLITE_IOERR );
testcase( rc==SQLITE_PROTOCOL );
testcase( rc==SQLITE_OK );
#ifdef SQLITE_ENABLE_SNAPSHOT
if( rc==SQLITE_OK ){
if( pSnapshot && memcmp(pSnapshot, &pWal->hdr, sizeof(WalIndexHdr))!=0 ){
/* At this point the client has a lock on an aReadMark[] slot holding
** a value equal to or smaller than pSnapshot->mxFrame, but pWal->hdr
** is populated with the wal-index header corresponding to the head
** of the wal file. Verify that pSnapshot is still valid before
** continuing. Reasons why pSnapshot might no longer be valid:
**
** (1) The WAL file has been reset since the snapshot was taken.
** In this case, the salt will have changed.
**
** (2) A checkpoint as been attempted that wrote frames past
** pSnapshot->mxFrame into the database file. Note that the
** checkpoint need not have completed for this to cause problems.
*/
volatile WalCkptInfo *pInfo = walCkptInfo(pWal);
assert( pWal->readLock>0 || pWal->hdr.mxFrame==0 );
assert( pInfo->aReadMark[pWal->readLock]<=pSnapshot->mxFrame );
/* Check that the wal file has not been wrapped. Assuming that it has
** not, also check that no checkpointer has attempted to checkpoint any
** frames beyond pSnapshot->mxFrame. If either of these conditions are
** true, return SQLITE_ERROR_SNAPSHOT. Otherwise, overwrite pWal->hdr
** with *pSnapshot and set *pChanged as appropriate for opening the
** snapshot. */
if( !memcmp(pSnapshot->aSalt, pWal->hdr.aSalt, sizeof(pWal->hdr.aSalt))
&& pSnapshot->mxFrame>=pInfo->nBackfillAttempted
){
assert( pWal->readLock>0 );
memcpy(&pWal->hdr, pSnapshot, sizeof(WalIndexHdr));
*pChanged = bChanged;
}else{
rc = SQLITE_ERROR_SNAPSHOT;
}
/* A client using a non-current snapshot may not ignore any frames
** from the start of the wal file. This is because, for a system
** where (minFrame < iSnapshot < maxFrame), a checkpointer may
** have omitted to checkpoint a frame earlier than minFrame in
** the file because there exists a frame after iSnapshot that
** is the same database page. */
pWal->minFrame = 1;
if( rc!=SQLITE_OK ){
sqlite3WalEndReadTransaction(pWal);
}
}
}
/* Release the shared CKPT lock obtained above. */
if( pWal->ckptLock ){
assert( pSnapshot );
walUnlockShared(pWal, WAL_CKPT_LOCK);
pWal->ckptLock = 0;
}
#endif
return rc;
}
/*
** Finish with a read transaction. All this does is release the
** read-lock.
*/
void sqlite3WalEndReadTransaction(Wal *pWal){
sqlite3WalEndWriteTransaction(pWal);
if( pWal->readLock>=0 ){
walUnlockShared(pWal, WAL_READ_LOCK(pWal->readLock));
pWal->readLock = -1;
}
}
/*
** Search the wal file for page pgno. If found, set *piRead to the frame that
** contains the page. Otherwise, if pgno is not in the wal file, set *piRead
** to zero.
**
** Return SQLITE_OK if successful, or an error code if an error occurs. If an
** error does occur, the final value of *piRead is undefined.
*/
int sqlite3WalFindFrame(
Wal *pWal, /* WAL handle */
Pgno pgno, /* Database page number to read data for */
u32 *piRead /* OUT: Frame number (or zero) */
){
u32 iRead = 0; /* If !=0, WAL frame to return data from */
u32 iLast = pWal->hdr.mxFrame; /* Last page in WAL for this reader */
int iHash; /* Used to loop through N hash tables */
int iMinHash;
/* This routine is only be called from within a read transaction. */
assert( pWal->readLock>=0 || pWal->lockError );
/* If the "last page" field of the wal-index header snapshot is 0, then
** no data will be read from the wal under any circumstances. Return early
** in this case as an optimization. Likewise, if pWal->readLock==0,
** then the WAL is ignored by the reader so return early, as if the
** WAL were empty.
*/
if( iLast==0 || (pWal->readLock==0 && pWal->bShmUnreliable==0) ){
*piRead = 0;
return SQLITE_OK;
}
/* Search the hash table or tables for an entry matching page number
** pgno. Each iteration of the following for() loop searches one
** hash table (each hash table indexes up to HASHTABLE_NPAGE frames).
**
** This code might run concurrently to the code in walIndexAppend()
** that adds entries to the wal-index (and possibly to this hash
** table). This means the value just read from the hash
** slot (aHash[iKey]) may have been added before or after the
** current read transaction was opened. Values added after the
** read transaction was opened may have been written incorrectly -
** i.e. these slots may contain garbage data. However, we assume
** that any slots written before the current read transaction was
** opened remain unmodified.
**
** For the reasons above, the if(...) condition featured in the inner
** loop of the following block is more stringent that would be required
** if we had exclusive access to the hash-table:
**
** (aPgno[iFrame]==pgno):
** This condition filters out normal hash-table collisions.
**
** (iFrame<=iLast):
** This condition filters out entries that were added to the hash
** table after the current read-transaction had started.
*/
iMinHash = walFramePage(pWal->minFrame);
for(iHash=walFramePage(iLast); iHash>=iMinHash; iHash--){
WalHashLoc sLoc; /* Hash table location */
int iKey; /* Hash slot index */
int nCollide; /* Number of hash collisions remaining */
int rc; /* Error code */
u32 iH;
rc = walHashGet(pWal, iHash, &sLoc);
if( rc!=SQLITE_OK ){
return rc;
}
nCollide = HASHTABLE_NSLOT;
iKey = walHash(pgno);
while( (iH = AtomicLoad(&sLoc.aHash[iKey]))!=0 ){
u32 iFrame = iH + sLoc.iZero;
if( iFrame<=iLast && iFrame>=pWal->minFrame && sLoc.aPgno[iH-1]==pgno ){
assert( iFrame>iRead || CORRUPT_DB );
iRead = iFrame;
}
if( (nCollide--)==0 ){
return SQLITE_CORRUPT_BKPT;
}
iKey = walNextHash(iKey);
}
if( iRead ) break;
}
#ifdef SQLITE_ENABLE_EXPENSIVE_ASSERT
/* If expensive assert() statements are available, do a linear search
** of the wal-index file content. Make sure the results agree with the
** result obtained using the hash indexes above. */
{
u32 iRead2 = 0;
u32 iTest;
assert( pWal->bShmUnreliable || pWal->minFrame>0 );
for(iTest=iLast; iTest>=pWal->minFrame && iTest>0; iTest--){
if( walFramePgno(pWal, iTest)==pgno ){
iRead2 = iTest;
break;
}
}
assert( iRead==iRead2 );
}
#endif
*piRead = iRead;
return SQLITE_OK;
}
/*
** Read the contents of frame iRead from the wal file into buffer pOut
** (which is nOut bytes in size). Return SQLITE_OK if successful, or an
** error code otherwise.
*/
int sqlite3WalReadFrame(
Wal *pWal, /* WAL handle */
u32 iRead, /* Frame to read */
int nOut, /* Size of buffer pOut in bytes */
u8 *pOut /* Buffer to write page data to */
){
int sz;
i64 iOffset;
sz = pWal->hdr.szPage;
sz = (sz&0xfe00) + ((sz&0x0001)<<16);
testcase( sz<=32768 );
testcase( sz>=65536 );
iOffset = walFrameOffset(iRead, sz) + WAL_FRAME_HDRSIZE;
/* testcase( IS_BIG_INT(iOffset) ); // requires a 4GiB WAL */
return sqlite3OsRead(pWal->pWalFd, pOut, (nOut>sz ? sz : nOut), iOffset);
}
/*
** Return the size of the database in pages (or zero, if unknown).
*/
Pgno sqlite3WalDbsize(Wal *pWal){
if( pWal && ALWAYS(pWal->readLock>=0) ){
return pWal->hdr.nPage;
}
return 0;
}
/*
** This function starts a write transaction on the WAL.
**
** A read transaction must have already been started by a prior call
** to sqlite3WalBeginReadTransaction().
**
** If another thread or process has written into the database since
** the read transaction was started, then it is not possible for this
** thread to write as doing so would cause a fork. So this routine
** returns SQLITE_BUSY in that case and no write transaction is started.
**
** There can only be a single writer active at a time.
*/
int sqlite3WalBeginWriteTransaction(Wal *pWal){
int rc;
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
/* If the write-lock is already held, then it was obtained before the
** read-transaction was even opened, making this call a no-op.
** Return early. */
if( pWal->writeLock ){
assert( !memcmp(&pWal->hdr,(void *)walIndexHdr(pWal),sizeof(WalIndexHdr)) );
return SQLITE_OK;
}
#endif
/* Cannot start a write transaction without first holding a read
** transaction. */
assert( pWal->readLock>=0 );
assert( pWal->writeLock==0 && pWal->iReCksum==0 );
if( pWal->readOnly ){
return SQLITE_READONLY;
}
/* Only one writer allowed at a time. Get the write lock. Return
** SQLITE_BUSY if unable.
*/
rc = walLockExclusive(pWal, WAL_WRITE_LOCK, 1);
if( rc ){
return rc;
}
pWal->writeLock = 1;
/* If another connection has written to the database file since the
** time the read transaction on this connection was started, then
** the write is disallowed.
*/
if( memcmp(&pWal->hdr, (void *)walIndexHdr(pWal), sizeof(WalIndexHdr))!=0 ){
walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
pWal->writeLock = 0;
rc = SQLITE_BUSY_SNAPSHOT;
}
return rc;
}
/*
** End a write transaction. The commit has already been done. This
** routine merely releases the lock.
*/
int sqlite3WalEndWriteTransaction(Wal *pWal){
if( pWal->writeLock ){
walUnlockExclusive(pWal, WAL_WRITE_LOCK, 1);
pWal->writeLock = 0;
pWal->iReCksum = 0;
pWal->truncateOnCommit = 0;
}
return SQLITE_OK;
}
/*
** If any data has been written (but not committed) to the log file, this
** function moves the write-pointer back to the start of the transaction.
**
** Additionally, the callback function is invoked for each frame written
** to the WAL since the start of the transaction. If the callback returns
** other than SQLITE_OK, it is not invoked again and the error code is
** returned to the caller.
**
** Otherwise, if the callback function does not return an error, this
** function returns SQLITE_OK.
*/
int sqlite3WalUndo(Wal *pWal, int (*xUndo)(void *, Pgno), void *pUndoCtx){
int rc = SQLITE_OK;
if( ALWAYS(pWal->writeLock) ){
Pgno iMax = pWal->hdr.mxFrame;
Pgno iFrame;
/* Restore the clients cache of the wal-index header to the state it
** was in before the client began writing to the database.
*/
memcpy(&pWal->hdr, (void *)walIndexHdr(pWal), sizeof(WalIndexHdr));
for(iFrame=pWal->hdr.mxFrame+1;
ALWAYS(rc==SQLITE_OK) && iFrame<=iMax;
iFrame++
){
/* This call cannot fail. Unless the page for which the page number
** is passed as the second argument is (a) in the cache and
** (b) has an outstanding reference, then xUndo is either a no-op
** (if (a) is false) or simply expels the page from the cache (if (b)
** is false).
**
** If the upper layer is doing a rollback, it is guaranteed that there
** are no outstanding references to any page other than page 1. And
** page 1 is never written to the log until the transaction is
** committed. As a result, the call to xUndo may not fail.
*/
assert( walFramePgno(pWal, iFrame)!=1 );
rc = xUndo(pUndoCtx, walFramePgno(pWal, iFrame));
}
if( iMax!=pWal->hdr.mxFrame ) walCleanupHash(pWal);
}
return rc;
}
/*
** Argument aWalData must point to an array of WAL_SAVEPOINT_NDATA u32
** values. This function populates the array with values required to
** "rollback" the write position of the WAL handle back to the current
** point in the event of a savepoint rollback (via WalSavepointUndo()).
*/
void sqlite3WalSavepoint(Wal *pWal, u32 *aWalData){
assert( pWal->writeLock );
aWalData[0] = pWal->hdr.mxFrame;
aWalData[1] = pWal->hdr.aFrameCksum[0];
aWalData[2] = pWal->hdr.aFrameCksum[1];
aWalData[3] = pWal->nCkpt;
}
/*
** Move the write position of the WAL back to the point identified by
** the values in the aWalData[] array. aWalData must point to an array
** of WAL_SAVEPOINT_NDATA u32 values that has been previously populated
** by a call to WalSavepoint().
*/
int sqlite3WalSavepointUndo(Wal *pWal, u32 *aWalData){
int rc = SQLITE_OK;
assert( pWal->writeLock );
assert( aWalData[3]!=pWal->nCkpt || aWalData[0]<=pWal->hdr.mxFrame );
if( aWalData[3]!=pWal->nCkpt ){
/* This savepoint was opened immediately after the write-transaction
** was started. Right after that, the writer decided to wrap around
** to the start of the log. Update the savepoint values to match.
*/
aWalData[0] = 0;
aWalData[3] = pWal->nCkpt;
}
if( aWalData[0]<pWal->hdr.mxFrame ){
pWal->hdr.mxFrame = aWalData[0];
pWal->hdr.aFrameCksum[0] = aWalData[1];
pWal->hdr.aFrameCksum[1] = aWalData[2];
walCleanupHash(pWal);
}
return rc;
}
/*
** This function is called just before writing a set of frames to the log
** file (see sqlite3WalFrames()). It checks to see if, instead of appending
** to the current log file, it is possible to overwrite the start of the
** existing log file with the new frames (i.e. "reset" the log). If so,
** it sets pWal->hdr.mxFrame to 0. Otherwise, pWal->hdr.mxFrame is left
** unchanged.
**
** SQLITE_OK is returned if no error is encountered (regardless of whether
** or not pWal->hdr.mxFrame is modified). An SQLite error code is returned
** if an error occurs.
*/
static int walRestartLog(Wal *pWal){
int rc = SQLITE_OK;
int cnt;
if( pWal->readLock==0 ){
volatile WalCkptInfo *pInfo = walCkptInfo(pWal);
assert( pInfo->nBackfill==pWal->hdr.mxFrame );
if( pInfo->nBackfill>0 ){
u32 salt1;
sqlite3_randomness(4, &salt1);
rc = walLockExclusive(pWal, WAL_READ_LOCK(1), WAL_NREADER-1);
if( rc==SQLITE_OK ){
/* If all readers are using WAL_READ_LOCK(0) (in other words if no
** readers are currently using the WAL), then the transactions
** frames will overwrite the start of the existing log. Update the
** wal-index header to reflect this.
**
** In theory it would be Ok to update the cache of the header only
** at this point. But updating the actual wal-index header is also
** safe and means there is no special case for sqlite3WalUndo()
** to handle if this transaction is rolled back. */
walRestartHdr(pWal, salt1);
walUnlockExclusive(pWal, WAL_READ_LOCK(1), WAL_NREADER-1);
}else if( rc!=SQLITE_BUSY ){
return rc;
}
}
walUnlockShared(pWal, WAL_READ_LOCK(0));
pWal->readLock = -1;
cnt = 0;
do{
int notUsed;
rc = walTryBeginRead(pWal, ¬Used, 1, ++cnt);
}while( rc==WAL_RETRY );
assert( (rc&0xff)!=SQLITE_BUSY ); /* BUSY not possible when useWal==1 */
testcase( (rc&0xff)==SQLITE_IOERR );
testcase( rc==SQLITE_PROTOCOL );
testcase( rc==SQLITE_OK );
}
return rc;
}
/*
** Information about the current state of the WAL file and where
** the next fsync should occur - passed from sqlite3WalFrames() into
** walWriteToLog().
*/
typedef struct WalWriter {
Wal *pWal; /* The complete WAL information */
sqlite3_file *pFd; /* The WAL file to which we write */
sqlite3_int64 iSyncPoint; /* Fsync at this offset */
int syncFlags; /* Flags for the fsync */
int szPage; /* Size of one page */
} WalWriter;
/*
** Write iAmt bytes of content into the WAL file beginning at iOffset.
** Do a sync when crossing the p->iSyncPoint boundary.
**
** In other words, if iSyncPoint is in between iOffset and iOffset+iAmt,
** first write the part before iSyncPoint, then sync, then write the
** rest.
*/
static int walWriteToLog(
WalWriter *p, /* WAL to write to */
void *pContent, /* Content to be written */
int iAmt, /* Number of bytes to write */
sqlite3_int64 iOffset /* Start writing at this offset */
){
int rc;
if( iOffset<p->iSyncPoint && iOffset+iAmt>=p->iSyncPoint ){
int iFirstAmt = (int)(p->iSyncPoint - iOffset);
rc = sqlite3OsWrite(p->pFd, pContent, iFirstAmt, iOffset);
if( rc ) return rc;
iOffset += iFirstAmt;
iAmt -= iFirstAmt;
pContent = (void*)(iFirstAmt + (char*)pContent);
assert( WAL_SYNC_FLAGS(p->syncFlags)!=0 );
rc = sqlite3OsSync(p->pFd, WAL_SYNC_FLAGS(p->syncFlags));
if( iAmt==0 || rc ) return rc;
}
rc = sqlite3OsWrite(p->pFd, pContent, iAmt, iOffset);
return rc;
}
/*
** Write out a single frame of the WAL
*/
static int walWriteOneFrame(
WalWriter *p, /* Where to write the frame */
PgHdr *pPage, /* The page of the frame to be written */
int nTruncate, /* The commit flag. Usually 0. >0 for commit */
sqlite3_int64 iOffset /* Byte offset at which to write */
){
int rc; /* Result code from subfunctions */
void *pData; /* Data actually written */
u8 aFrame[WAL_FRAME_HDRSIZE]; /* Buffer to assemble frame-header in */
pData = pPage->pData;
walEncodeFrame(p->pWal, pPage->pgno, nTruncate, pData, aFrame);
rc = walWriteToLog(p, aFrame, sizeof(aFrame), iOffset);
if( rc ) return rc;
/* Write the page data */
rc = walWriteToLog(p, pData, p->szPage, iOffset+sizeof(aFrame));
return rc;
}
/*
** This function is called as part of committing a transaction within which
** one or more frames have been overwritten. It updates the checksums for
** all frames written to the wal file by the current transaction starting
** with the earliest to have been overwritten.
**
** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
*/
static int walRewriteChecksums(Wal *pWal, u32 iLast){
const int szPage = pWal->szPage;/* Database page size */
int rc = SQLITE_OK; /* Return code */
u8 *aBuf; /* Buffer to load data from wal file into */
u8 aFrame[WAL_FRAME_HDRSIZE]; /* Buffer to assemble frame-headers in */
u32 iRead; /* Next frame to read from wal file */
i64 iCksumOff;
aBuf = sqlite3_malloc(szPage + WAL_FRAME_HDRSIZE);
if( aBuf==0 ) return SQLITE_NOMEM_BKPT;
/* Find the checksum values to use as input for the recalculating the
** first checksum. If the first frame is frame 1 (implying that the current
** transaction restarted the wal file), these values must be read from the
** wal-file header. Otherwise, read them from the frame header of the
** previous frame. */
assert( pWal->iReCksum>0 );
if( pWal->iReCksum==1 ){
iCksumOff = 24;
}else{
iCksumOff = walFrameOffset(pWal->iReCksum-1, szPage) + 16;
}
rc = sqlite3OsRead(pWal->pWalFd, aBuf, sizeof(u32)*2, iCksumOff);
pWal->hdr.aFrameCksum[0] = sqlite3Get4byte(aBuf);
pWal->hdr.aFrameCksum[1] = sqlite3Get4byte(&aBuf[sizeof(u32)]);
iRead = pWal->iReCksum;
pWal->iReCksum = 0;
for(; rc==SQLITE_OK && iRead<=iLast; iRead++){
i64 iOff = walFrameOffset(iRead, szPage);
rc = sqlite3OsRead(pWal->pWalFd, aBuf, szPage+WAL_FRAME_HDRSIZE, iOff);
if( rc==SQLITE_OK ){
u32 iPgno, nDbSize;
iPgno = sqlite3Get4byte(aBuf);
nDbSize = sqlite3Get4byte(&aBuf[4]);
walEncodeFrame(pWal, iPgno, nDbSize, &aBuf[WAL_FRAME_HDRSIZE], aFrame);
rc = sqlite3OsWrite(pWal->pWalFd, aFrame, sizeof(aFrame), iOff);
}
}
sqlite3_free(aBuf);
return rc;
}
/*
** Write a set of frames to the log. The caller must hold the write-lock
** on the log file (obtained using sqlite3WalBeginWriteTransaction()).
*/
int sqlite3WalFrames(
Wal *pWal, /* Wal handle to write to */
int szPage, /* Database page-size in bytes */
PgHdr *pList, /* List of dirty pages to write */
Pgno nTruncate, /* Database size after this commit */
int isCommit, /* True if this is a commit */
int sync_flags /* Flags to pass to OsSync() (or 0) */
){
int rc; /* Used to catch return codes */
u32 iFrame; /* Next frame address */
PgHdr *p; /* Iterator to run through pList with. */
PgHdr *pLast = 0; /* Last frame in list */
int nExtra = 0; /* Number of extra copies of last page */
int szFrame; /* The size of a single frame */
i64 iOffset; /* Next byte to write in WAL file */
WalWriter w; /* The writer */
u32 iFirst = 0; /* First frame that may be overwritten */
WalIndexHdr *pLive; /* Pointer to shared header */
assert( pList );
assert( pWal->writeLock );
/* If this frame set completes a transaction, then nTruncate>0. If
** nTruncate==0 then this frame set does not complete the transaction. */
assert( (isCommit!=0)==(nTruncate!=0) );
#if defined(SQLITE_TEST) && defined(SQLITE_DEBUG)
{ int cnt; for(cnt=0, p=pList; p; p=p->pDirty, cnt++){}
WALTRACE(("WAL%p: frame write begin. %d frames. mxFrame=%d. %s\n",
pWal, cnt, pWal->hdr.mxFrame, isCommit ? "Commit" : "Spill"));
}
#endif
pLive = (WalIndexHdr*)walIndexHdr(pWal);
if( memcmp(&pWal->hdr, (void *)pLive, sizeof(WalIndexHdr))!=0 ){
iFirst = pLive->mxFrame+1;
}
/* See if it is possible to write these frames into the start of the
** log file, instead of appending to it at pWal->hdr.mxFrame.
*/
if( SQLITE_OK!=(rc = walRestartLog(pWal)) ){
return rc;
}
/* If this is the first frame written into the log, write the WAL
** header to the start of the WAL file. See comments at the top of
** this source file for a description of the WAL header format.
*/
iFrame = pWal->hdr.mxFrame;
if( iFrame==0 ){
u8 aWalHdr[WAL_HDRSIZE]; /* Buffer to assemble wal-header in */
u32 aCksum[2]; /* Checksum for wal-header */
sqlite3Put4byte(&aWalHdr[0], (WAL_MAGIC | SQLITE_BIGENDIAN));
sqlite3Put4byte(&aWalHdr[4], WAL_MAX_VERSION);
sqlite3Put4byte(&aWalHdr[8], szPage);
sqlite3Put4byte(&aWalHdr[12], pWal->nCkpt);
if( pWal->nCkpt==0 ) sqlite3_randomness(8, pWal->hdr.aSalt);
memcpy(&aWalHdr[16], pWal->hdr.aSalt, 8);
walChecksumBytes(1, aWalHdr, WAL_HDRSIZE-2*4, 0, aCksum);
sqlite3Put4byte(&aWalHdr[24], aCksum[0]);
sqlite3Put4byte(&aWalHdr[28], aCksum[1]);
pWal->szPage = szPage;
pWal->hdr.bigEndCksum = SQLITE_BIGENDIAN;
pWal->hdr.aFrameCksum[0] = aCksum[0];
pWal->hdr.aFrameCksum[1] = aCksum[1];
pWal->truncateOnCommit = 1;
rc = sqlite3OsWrite(pWal->pWalFd, aWalHdr, sizeof(aWalHdr), 0);
WALTRACE(("WAL%p: wal-header write %s\n", pWal, rc ? "failed" : "ok"));
if( rc!=SQLITE_OK ){
return rc;
}
/* Sync the header (unless SQLITE_IOCAP_SEQUENTIAL is true or unless
** all syncing is turned off by PRAGMA synchronous=OFF). Otherwise
** an out-of-order write following a WAL restart could result in
** database corruption. See the ticket:
**
** https://sqlite.org/src/info/ff5be73dee
*/
if( pWal->syncHeader ){
rc = sqlite3OsSync(pWal->pWalFd, CKPT_SYNC_FLAGS(sync_flags));
if( rc ) return rc;
}
}
assert( (int)pWal->szPage==szPage );
/* Setup information needed to write frames into the WAL */
w.pWal = pWal;
w.pFd = pWal->pWalFd;
w.iSyncPoint = 0;
w.syncFlags = sync_flags;
w.szPage = szPage;
iOffset = walFrameOffset(iFrame+1, szPage);
szFrame = szPage + WAL_FRAME_HDRSIZE;
/* Write all frames into the log file exactly once */
for(p=pList; p; p=p->pDirty){
int nDbSize; /* 0 normally. Positive == commit flag */
/* Check if this page has already been written into the wal file by
** the current transaction. If so, overwrite the existing frame and
** set Wal.writeLock to WAL_WRITELOCK_RECKSUM - indicating that
** checksums must be recomputed when the transaction is committed. */
if( iFirst && (p->pDirty || isCommit==0) ){
u32 iWrite = 0;
VVA_ONLY(rc =) sqlite3WalFindFrame(pWal, p->pgno, &iWrite);
assert( rc==SQLITE_OK || iWrite==0 );
if( iWrite>=iFirst ){
i64 iOff = walFrameOffset(iWrite, szPage) + WAL_FRAME_HDRSIZE;
void *pData;
if( pWal->iReCksum==0 || iWrite<pWal->iReCksum ){
pWal->iReCksum = iWrite;
}
pData = p->pData;
rc = sqlite3OsWrite(pWal->pWalFd, pData, szPage, iOff);
if( rc ) return rc;
p->flags &= ~PGHDR_WAL_APPEND;
continue;
}
}
iFrame++;
assert( iOffset==walFrameOffset(iFrame, szPage) );
nDbSize = (isCommit && p->pDirty==0) ? nTruncate : 0;
rc = walWriteOneFrame(&w, p, nDbSize, iOffset);
if( rc ) return rc;
pLast = p;
iOffset += szFrame;
p->flags |= PGHDR_WAL_APPEND;
}
/* Recalculate checksums within the wal file if required. */
if( isCommit && pWal->iReCksum ){
rc = walRewriteChecksums(pWal, iFrame);
if( rc ) return rc;
}
/* If this is the end of a transaction, then we might need to pad
** the transaction and/or sync the WAL file.
**
** Padding and syncing only occur if this set of frames complete a
** transaction and if PRAGMA synchronous=FULL. If synchronous==NORMAL
** or synchronous==OFF, then no padding or syncing are needed.
**
** If SQLITE_IOCAP_POWERSAFE_OVERWRITE is defined, then padding is not
** needed and only the sync is done. If padding is needed, then the
** final frame is repeated (with its commit mark) until the next sector
** boundary is crossed. Only the part of the WAL prior to the last
** sector boundary is synced; the part of the last frame that extends
** past the sector boundary is written after the sync.
*/
if( isCommit && WAL_SYNC_FLAGS(sync_flags)!=0 ){
int bSync = 1;
if( pWal->padToSectorBoundary ){
int sectorSize = sqlite3SectorSize(pWal->pWalFd);
w.iSyncPoint = ((iOffset+sectorSize-1)/sectorSize)*sectorSize;
bSync = (w.iSyncPoint==iOffset);
testcase( bSync );
while( iOffset<w.iSyncPoint ){
rc = walWriteOneFrame(&w, pLast, nTruncate, iOffset);
if( rc ) return rc;
iOffset += szFrame;
nExtra++;
assert( pLast!=0 );
}
}
if( bSync ){
assert( rc==SQLITE_OK );
rc = sqlite3OsSync(w.pFd, WAL_SYNC_FLAGS(sync_flags));
}
}
/* If this frame set completes the first transaction in the WAL and
** if PRAGMA journal_size_limit is set, then truncate the WAL to the
** journal size limit, if possible.
*/
if( isCommit && pWal->truncateOnCommit && pWal->mxWalSize>=0 ){
i64 sz = pWal->mxWalSize;
if( walFrameOffset(iFrame+nExtra+1, szPage)>pWal->mxWalSize ){
sz = walFrameOffset(iFrame+nExtra+1, szPage);
}
walLimitSize(pWal, sz);
pWal->truncateOnCommit = 0;
}
/* Append data to the wal-index. It is not necessary to lock the
** wal-index to do this as the SQLITE_SHM_WRITE lock held on the wal-index
** guarantees that there are no other writers, and no data that may
** be in use by existing readers is being overwritten.
*/
iFrame = pWal->hdr.mxFrame;
for(p=pList; p && rc==SQLITE_OK; p=p->pDirty){
if( (p->flags & PGHDR_WAL_APPEND)==0 ) continue;
iFrame++;
rc = walIndexAppend(pWal, iFrame, p->pgno);
}
assert( pLast!=0 || nExtra==0 );
while( rc==SQLITE_OK && nExtra>0 ){
iFrame++;
nExtra--;
rc = walIndexAppend(pWal, iFrame, pLast->pgno);
}
if( rc==SQLITE_OK ){
/* Update the private copy of the header. */
pWal->hdr.szPage = (u16)((szPage&0xff00) | (szPage>>16));
testcase( szPage<=32768 );
testcase( szPage>=65536 );
pWal->hdr.mxFrame = iFrame;
if( isCommit ){
pWal->hdr.iChange++;
pWal->hdr.nPage = nTruncate;
}
/* If this is a commit, update the wal-index header too. */
if( isCommit ){
walIndexWriteHdr(pWal);
pWal->iCallback = iFrame;
}
}
WALTRACE(("WAL%p: frame write %s\n", pWal, rc ? "failed" : "ok"));
return rc;
}
/*
** This routine is called to implement sqlite3_wal_checkpoint() and
** related interfaces.
**
** Obtain a CHECKPOINT lock and then backfill as much information as
** we can from WAL into the database.
**
** If parameter xBusy is not NULL, it is a pointer to a busy-handler
** callback. In this case this function runs a blocking checkpoint.
*/
int sqlite3WalCheckpoint(
Wal *pWal, /* Wal connection */
sqlite3 *db, /* Check this handle's interrupt flag */
int eMode, /* PASSIVE, FULL, RESTART, or TRUNCATE */
int (*xBusy)(void*), /* Function to call when busy */
void *pBusyArg, /* Context argument for xBusyHandler */
int sync_flags, /* Flags to sync db file with (or 0) */
int nBuf, /* Size of temporary buffer */
u8 *zBuf, /* Temporary buffer to use */
int *pnLog, /* OUT: Number of frames in WAL */
int *pnCkpt /* OUT: Number of backfilled frames in WAL */
){
int rc; /* Return code */
int isChanged = 0; /* True if a new wal-index header is loaded */
int eMode2 = eMode; /* Mode to pass to walCheckpoint() */
int (*xBusy2)(void*) = xBusy; /* Busy handler for eMode2 */
assert( pWal->ckptLock==0 );
assert( pWal->writeLock==0 );
/* EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
** in the SQLITE_CHECKPOINT_PASSIVE mode. */
assert( eMode!=SQLITE_CHECKPOINT_PASSIVE || xBusy==0 );
if( pWal->readOnly ) return SQLITE_READONLY;
WALTRACE(("WAL%p: checkpoint begins\n", pWal));
/* Enable blocking locks, if possible. If blocking locks are successfully
** enabled, set xBusy2=0 so that the busy-handler is never invoked. */
sqlite3WalDb(pWal, db);
(void)walEnableBlocking(pWal);
/* IMPLEMENTATION-OF: R-62028-47212 All calls obtain an exclusive
** "checkpoint" lock on the database file.
** EVIDENCE-OF: R-10421-19736 If any other process is running a
** checkpoint operation at the same time, the lock cannot be obtained and
** SQLITE_BUSY is returned.
** EVIDENCE-OF: R-53820-33897 Even if there is a busy-handler configured,
** it will not be invoked in this case.
*/
rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1);
testcase( rc==SQLITE_BUSY );
testcase( rc!=SQLITE_OK && xBusy2!=0 );
if( rc==SQLITE_OK ){
pWal->ckptLock = 1;
/* IMPLEMENTATION-OF: R-59782-36818 The SQLITE_CHECKPOINT_FULL, RESTART and
** TRUNCATE modes also obtain the exclusive "writer" lock on the database
** file.
**
** EVIDENCE-OF: R-60642-04082 If the writer lock cannot be obtained
** immediately, and a busy-handler is configured, it is invoked and the
** writer lock retried until either the busy-handler returns 0 or the
** lock is successfully obtained.
*/
if( eMode!=SQLITE_CHECKPOINT_PASSIVE ){
rc = walBusyLock(pWal, xBusy2, pBusyArg, WAL_WRITE_LOCK, 1);
if( rc==SQLITE_OK ){
pWal->writeLock = 1;
}else if( rc==SQLITE_BUSY ){
eMode2 = SQLITE_CHECKPOINT_PASSIVE;
xBusy2 = 0;
rc = SQLITE_OK;
}
}
}
/* Read the wal-index header. */
if( rc==SQLITE_OK ){
walDisableBlocking(pWal);
rc = walIndexReadHdr(pWal, &isChanged);
(void)walEnableBlocking(pWal);
if( isChanged && pWal->pDbFd->pMethods->iVersion>=3 ){
sqlite3OsUnfetch(pWal->pDbFd, 0, 0);
}
}
/* Copy data from the log to the database file. */
if( rc==SQLITE_OK ){
if( pWal->hdr.mxFrame && walPagesize(pWal)!=nBuf ){
rc = SQLITE_CORRUPT_BKPT;
}else{
rc = walCheckpoint(pWal, db, eMode2, xBusy2, pBusyArg, sync_flags, zBuf);
}
/* If no error occurred, set the output variables. */
if( rc==SQLITE_OK || rc==SQLITE_BUSY ){
if( pnLog ) *pnLog = (int)pWal->hdr.mxFrame;
if( pnCkpt ) *pnCkpt = (int)(walCkptInfo(pWal)->nBackfill);
}
}
if( isChanged ){
/* If a new wal-index header was loaded before the checkpoint was
** performed, then the pager-cache associated with pWal is now
** out of date. So zero the cached wal-index header to ensure that
** next time the pager opens a snapshot on this database it knows that
** the cache needs to be reset.
*/
memset(&pWal->hdr, 0, sizeof(WalIndexHdr));
}
walDisableBlocking(pWal);
sqlite3WalDb(pWal, 0);
/* Release the locks. */
sqlite3WalEndWriteTransaction(pWal);
if( pWal->ckptLock ){
walUnlockExclusive(pWal, WAL_CKPT_LOCK, 1);
pWal->ckptLock = 0;
}
WALTRACE(("WAL%p: checkpoint %s\n", pWal, rc ? "failed" : "ok"));
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
if( rc==SQLITE_BUSY_TIMEOUT ) rc = SQLITE_BUSY;
#endif
return (rc==SQLITE_OK && eMode!=eMode2 ? SQLITE_BUSY : rc);
}
/* Return the value to pass to a sqlite3_wal_hook callback, the
** number of frames in the WAL at the point of the last commit since
** sqlite3WalCallback() was called. If no commits have occurred since
** the last call, then return 0.
*/
int sqlite3WalCallback(Wal *pWal){
u32 ret = 0;
if( pWal ){
ret = pWal->iCallback;
pWal->iCallback = 0;
}
return (int)ret;
}
/*
** This function is called to change the WAL subsystem into or out
** of locking_mode=EXCLUSIVE.
**
** If op is zero, then attempt to change from locking_mode=EXCLUSIVE
** into locking_mode=NORMAL. This means that we must acquire a lock
** on the pWal->readLock byte. If the WAL is already in locking_mode=NORMAL
** or if the acquisition of the lock fails, then return 0. If the
** transition out of exclusive-mode is successful, return 1. This
** operation must occur while the pager is still holding the exclusive
** lock on the main database file.
**
** If op is one, then change from locking_mode=NORMAL into
** locking_mode=EXCLUSIVE. This means that the pWal->readLock must
** be released. Return 1 if the transition is made and 0 if the
** WAL is already in exclusive-locking mode - meaning that this
** routine is a no-op. The pager must already hold the exclusive lock
** on the main database file before invoking this operation.
**
** If op is negative, then do a dry-run of the op==1 case but do
** not actually change anything. The pager uses this to see if it
** should acquire the database exclusive lock prior to invoking
** the op==1 case.
*/
int sqlite3WalExclusiveMode(Wal *pWal, int op){
int rc;
assert( pWal->writeLock==0 );
assert( pWal->exclusiveMode!=WAL_HEAPMEMORY_MODE || op==-1 );
/* pWal->readLock is usually set, but might be -1 if there was a
** prior error while attempting to acquire are read-lock. This cannot
** happen if the connection is actually in exclusive mode (as no xShmLock
** locks are taken in this case). Nor should the pager attempt to
** upgrade to exclusive-mode following such an error.
*/
assert( pWal->readLock>=0 || pWal->lockError );
assert( pWal->readLock>=0 || (op<=0 && pWal->exclusiveMode==0) );
if( op==0 ){
if( pWal->exclusiveMode!=WAL_NORMAL_MODE ){
pWal->exclusiveMode = WAL_NORMAL_MODE;
if( walLockShared(pWal, WAL_READ_LOCK(pWal->readLock))!=SQLITE_OK ){
pWal->exclusiveMode = WAL_EXCLUSIVE_MODE;
}
rc = pWal->exclusiveMode==WAL_NORMAL_MODE;
}else{
/* Already in locking_mode=NORMAL */
rc = 0;
}
}else if( op>0 ){
assert( pWal->exclusiveMode==WAL_NORMAL_MODE );
assert( pWal->readLock>=0 );
walUnlockShared(pWal, WAL_READ_LOCK(pWal->readLock));
pWal->exclusiveMode = WAL_EXCLUSIVE_MODE;
rc = 1;
}else{
rc = pWal->exclusiveMode==WAL_NORMAL_MODE;
}
return rc;
}
/*
** Return true if the argument is non-NULL and the WAL module is using
** heap-memory for the wal-index. Otherwise, if the argument is NULL or the
** WAL module is using shared-memory, return false.
*/
int sqlite3WalHeapMemory(Wal *pWal){
return (pWal && pWal->exclusiveMode==WAL_HEAPMEMORY_MODE );
}
#ifdef SQLITE_ENABLE_SNAPSHOT
/* Create a snapshot object. The content of a snapshot is opaque to
** every other subsystem, so the WAL module can put whatever it needs
** in the object.
*/
int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot){
int rc = SQLITE_OK;
WalIndexHdr *pRet;
static const u32 aZero[4] = { 0, 0, 0, 0 };
assert( pWal->readLock>=0 && pWal->writeLock==0 );
if( memcmp(&pWal->hdr.aFrameCksum[0],aZero,16)==0 ){
*ppSnapshot = 0;
return SQLITE_ERROR;
}
pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr));
if( pRet==0 ){
rc = SQLITE_NOMEM_BKPT;
}else{
memcpy(pRet, &pWal->hdr, sizeof(WalIndexHdr));
*ppSnapshot = (sqlite3_snapshot*)pRet;
}
return rc;
}
/* Try to open on pSnapshot when the next read-transaction starts
*/
void sqlite3WalSnapshotOpen(
Wal *pWal,
sqlite3_snapshot *pSnapshot
){
pWal->pSnapshot = (WalIndexHdr*)pSnapshot;
}
/*
** Return a +ve value if snapshot p1 is newer than p2. A -ve value if
** p1 is older than p2 and zero if p1 and p2 are the same snapshot.
*/
int sqlite3_snapshot_cmp(sqlite3_snapshot *p1, sqlite3_snapshot *p2){
WalIndexHdr *pHdr1 = (WalIndexHdr*)p1;
WalIndexHdr *pHdr2 = (WalIndexHdr*)p2;
/* aSalt[0] is a copy of the value stored in the wal file header. It
** is incremented each time the wal file is restarted. */
if( pHdr1->aSalt[0]<pHdr2->aSalt[0] ) return -1;
if( pHdr1->aSalt[0]>pHdr2->aSalt[0] ) return +1;
if( pHdr1->mxFrame<pHdr2->mxFrame ) return -1;
if( pHdr1->mxFrame>pHdr2->mxFrame ) return +1;
return 0;
}
/*
** The caller currently has a read transaction open on the database.
** This function takes a SHARED lock on the CHECKPOINTER slot and then
** checks if the snapshot passed as the second argument is still
** available. If so, SQLITE_OK is returned.
**
** If the snapshot is not available, SQLITE_ERROR is returned. Or, if
** the CHECKPOINTER lock cannot be obtained, SQLITE_BUSY. If any error
** occurs (any value other than SQLITE_OK is returned), the CHECKPOINTER
** lock is released before returning.
*/
int sqlite3WalSnapshotCheck(Wal *pWal, sqlite3_snapshot *pSnapshot){
int rc;
rc = walLockShared(pWal, WAL_CKPT_LOCK);
if( rc==SQLITE_OK ){
WalIndexHdr *pNew = (WalIndexHdr*)pSnapshot;
if( memcmp(pNew->aSalt, pWal->hdr.aSalt, sizeof(pWal->hdr.aSalt))
|| pNew->mxFrame<walCkptInfo(pWal)->nBackfillAttempted
){
rc = SQLITE_ERROR_SNAPSHOT;
walUnlockShared(pWal, WAL_CKPT_LOCK);
}
}
return rc;
}
/*
** Release a lock obtained by an earlier successful call to
** sqlite3WalSnapshotCheck().
*/
void sqlite3WalSnapshotUnlock(Wal *pWal){
assert( pWal );
walUnlockShared(pWal, WAL_CKPT_LOCK);
}
#endif /* SQLITE_ENABLE_SNAPSHOT */
#ifdef SQLITE_ENABLE_ZIPVFS
/*
** If the argument is not NULL, it points to a Wal object that holds a
** read-lock. This function returns the database page-size if it is known,
** or zero if it is not (or if pWal is NULL).
*/
int sqlite3WalFramesize(Wal *pWal){
assert( pWal==0 || pWal->readLock>=0 );
return (pWal ? pWal->szPage : 0);
}
#endif
/* Return the sqlite3_file object for the WAL file
*/
sqlite3_file *sqlite3WalFile(Wal *pWal){
return pWal->pWalFd;
}
#endif /* #ifndef SQLITE_OMIT_WAL */
| 160,186 | 4,156 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/README.cosmo | DESCRIPTION
SQLite is an embeddable SQL relational database with a ~1mb
footprint and a wide variety of features.
ORIGIN
https://www.sqlite.org/2022/sqlite-preprocessed-3400000.zip
LICENSE
Public Domain or MIT
LOCAL CHANGES
- Added `/zip/.args` file support to SQLite shell
- Added `--strace` system call tracing flag to SQLite shell
- Added `--strace` function call logging flag to SQLite shell
- Configured fsync() using runtime magnums rather than ifdefs
- Modify preprocessor macro for enabling pread() and pwrite()
- Save and restore errno in some places to avoid log pollution
| 618 | 22 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/pragma.shell.c | #include "third_party/sqlite3/pragma.c"
| 40 | 2 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/fts3_tokenize_vtab.c | /*
** 2013 Apr 22
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains code for the "fts3tokenize" virtual table module.
** An fts3tokenize virtual table is created as follows:
**
** CREATE VIRTUAL TABLE <tbl> USING fts3tokenize(
** <tokenizer-name>, <arg-1>, ...
** );
**
** The table created has the following schema:
**
** CREATE TABLE <tbl>(input, token, start, end, position)
**
** When queried, the query must include a WHERE clause of type:
**
** input = <string>
**
** The virtual table module tokenizes this <string>, using the FTS3
** tokenizer specified by the arguments to the CREATE VIRTUAL TABLE
** statement and returns one row for each token in the result. With
** fields set as follows:
**
** input: Always set to a copy of <string>
** token: A token from the input.
** start: Byte offset of the token within the input <string>.
** end: Byte offset of the byte immediately following the end of the
** token within the input string.
** pos: Token offset of token within input.
**
*/
#include "third_party/sqlite3/fts3Int.h"
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
#include "libc/str/str.h"
#include "libc/assert.h"
typedef struct Fts3tokTable Fts3tokTable;
typedef struct Fts3tokCursor Fts3tokCursor;
/*
** Virtual table structure.
*/
struct Fts3tokTable {
sqlite3_vtab base; /* Base class used by SQLite core */
const sqlite3_tokenizer_module *pMod;
sqlite3_tokenizer *pTok;
};
/*
** Virtual table cursor structure.
*/
struct Fts3tokCursor {
sqlite3_vtab_cursor base; /* Base class used by SQLite core */
char *zInput; /* Input string */
sqlite3_tokenizer_cursor *pCsr; /* Cursor to iterate through zInput */
int iRowid; /* Current 'rowid' value */
const char *zToken; /* Current 'token' value */
int nToken; /* Size of zToken in bytes */
int iStart; /* Current 'start' value */
int iEnd; /* Current 'end' value */
int iPos; /* Current 'pos' value */
};
/*
** Query FTS for the tokenizer implementation named zName.
*/
static int fts3tokQueryTokenizer(
Fts3Hash *pHash,
const char *zName,
const sqlite3_tokenizer_module **pp,
char **pzErr
){
sqlite3_tokenizer_module *p;
int nName = (int)strlen(zName);
p = (sqlite3_tokenizer_module *)sqlite3Fts3HashFind(pHash, zName, nName+1);
if( !p ){
sqlite3Fts3ErrMsg(pzErr, "unknown tokenizer: %s", zName);
return SQLITE_ERROR;
}
*pp = p;
return SQLITE_OK;
}
/*
** The second argument, argv[], is an array of pointers to nul-terminated
** strings. This function makes a copy of the array and strings into a
** single block of memory. It then dequotes any of the strings that appear
** to be quoted.
**
** If successful, output parameter *pazDequote is set to point at the
** array of dequoted strings and SQLITE_OK is returned. The caller is
** responsible for eventually calling sqlite3_free() to free the array
** in this case. Or, if an error occurs, an SQLite error code is returned.
** The final value of *pazDequote is undefined in this case.
*/
static int fts3tokDequoteArray(
int argc, /* Number of elements in argv[] */
const char * const *argv, /* Input array */
char ***pazDequote /* Output array */
){
int rc = SQLITE_OK; /* Return code */
if( argc==0 ){
*pazDequote = 0;
}else{
int i;
int nByte = 0;
char **azDequote;
for(i=0; i<argc; i++){
nByte += (int)(strlen(argv[i]) + 1);
}
*pazDequote = azDequote = sqlite3_malloc64(sizeof(char *)*argc + nByte);
if( azDequote==0 ){
rc = SQLITE_NOMEM;
}else{
char *pSpace = (char *)&azDequote[argc];
for(i=0; i<argc; i++){
int n = (int)strlen(argv[i]);
azDequote[i] = pSpace;
memcpy(pSpace, argv[i], n+1);
sqlite3Fts3Dequote(pSpace);
pSpace += (n+1);
}
}
}
return rc;
}
/*
** Schema of the tokenizer table.
*/
#define FTS3_TOK_SCHEMA "CREATE TABLE x(input, token, start, end, position)"
/*
** This function does all the work for both the xConnect and xCreate methods.
** These tables have no persistent representation of their own, so xConnect
** and xCreate are identical operations.
**
** argv[0]: module name
** argv[1]: database name
** argv[2]: table name
** argv[3]: first argument (tokenizer name)
*/
static int fts3tokConnectMethod(
sqlite3 *db, /* Database connection */
void *pHash, /* Hash table of tokenizers */
int argc, /* Number of elements in argv array */
const char * const *argv, /* xCreate/xConnect argument array */
sqlite3_vtab **ppVtab, /* OUT: New sqlite3_vtab object */
char **pzErr /* OUT: sqlite3_malloc'd error message */
){
Fts3tokTable *pTab = 0;
const sqlite3_tokenizer_module *pMod = 0;
sqlite3_tokenizer *pTok = 0;
int rc;
char **azDequote = 0;
int nDequote;
rc = sqlite3_declare_vtab(db, FTS3_TOK_SCHEMA);
if( rc!=SQLITE_OK ) return rc;
nDequote = argc-3;
rc = fts3tokDequoteArray(nDequote, &argv[3], &azDequote);
if( rc==SQLITE_OK ){
const char *zModule;
if( nDequote<1 ){
zModule = "simple";
}else{
zModule = azDequote[0];
}
rc = fts3tokQueryTokenizer((Fts3Hash*)pHash, zModule, &pMod, pzErr);
}
assert( (rc==SQLITE_OK)==(pMod!=0) );
if( rc==SQLITE_OK ){
const char * const *azArg = 0;
if( nDequote>1 ) azArg = (const char * const *)&azDequote[1];
rc = pMod->xCreate((nDequote>1 ? nDequote-1 : 0), azArg, &pTok);
}
if( rc==SQLITE_OK ){
pTab = (Fts3tokTable *)sqlite3_malloc(sizeof(Fts3tokTable));
if( pTab==0 ){
rc = SQLITE_NOMEM;
}
}
if( rc==SQLITE_OK ){
memset(pTab, 0, sizeof(Fts3tokTable));
pTab->pMod = pMod;
pTab->pTok = pTok;
*ppVtab = &pTab->base;
}else{
if( pTok ){
pMod->xDestroy(pTok);
}
}
sqlite3_free(azDequote);
return rc;
}
/*
** This function does the work for both the xDisconnect and xDestroy methods.
** These tables have no persistent representation of their own, so xDisconnect
** and xDestroy are identical operations.
*/
static int fts3tokDisconnectMethod(sqlite3_vtab *pVtab){
Fts3tokTable *pTab = (Fts3tokTable *)pVtab;
pTab->pMod->xDestroy(pTab->pTok);
sqlite3_free(pTab);
return SQLITE_OK;
}
/*
** xBestIndex - Analyze a WHERE and ORDER BY clause.
*/
static int fts3tokBestIndexMethod(
sqlite3_vtab *pVTab,
sqlite3_index_info *pInfo
){
int i;
UNUSED_PARAMETER(pVTab);
for(i=0; i<pInfo->nConstraint; i++){
if( pInfo->aConstraint[i].usable
&& pInfo->aConstraint[i].iColumn==0
&& pInfo->aConstraint[i].op==SQLITE_INDEX_CONSTRAINT_EQ
){
pInfo->idxNum = 1;
pInfo->aConstraintUsage[i].argvIndex = 1;
pInfo->aConstraintUsage[i].omit = 1;
pInfo->estimatedCost = 1;
return SQLITE_OK;
}
}
pInfo->idxNum = 0;
assert( pInfo->estimatedCost>1000000.0 );
return SQLITE_OK;
}
/*
** xOpen - Open a cursor.
*/
static int fts3tokOpenMethod(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCsr){
Fts3tokCursor *pCsr;
UNUSED_PARAMETER(pVTab);
pCsr = (Fts3tokCursor *)sqlite3_malloc(sizeof(Fts3tokCursor));
if( pCsr==0 ){
return SQLITE_NOMEM;
}
memset(pCsr, 0, sizeof(Fts3tokCursor));
*ppCsr = (sqlite3_vtab_cursor *)pCsr;
return SQLITE_OK;
}
/*
** Reset the tokenizer cursor passed as the only argument. As if it had
** just been returned by fts3tokOpenMethod().
*/
static void fts3tokResetCursor(Fts3tokCursor *pCsr){
if( pCsr->pCsr ){
Fts3tokTable *pTab = (Fts3tokTable *)(pCsr->base.pVtab);
pTab->pMod->xClose(pCsr->pCsr);
pCsr->pCsr = 0;
}
sqlite3_free(pCsr->zInput);
pCsr->zInput = 0;
pCsr->zToken = 0;
pCsr->nToken = 0;
pCsr->iStart = 0;
pCsr->iEnd = 0;
pCsr->iPos = 0;
pCsr->iRowid = 0;
}
/*
** xClose - Close a cursor.
*/
static int fts3tokCloseMethod(sqlite3_vtab_cursor *pCursor){
Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
fts3tokResetCursor(pCsr);
sqlite3_free(pCsr);
return SQLITE_OK;
}
/*
** xNext - Advance the cursor to the next row, if any.
*/
static int fts3tokNextMethod(sqlite3_vtab_cursor *pCursor){
Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
Fts3tokTable *pTab = (Fts3tokTable *)(pCursor->pVtab);
int rc; /* Return code */
pCsr->iRowid++;
rc = pTab->pMod->xNext(pCsr->pCsr,
&pCsr->zToken, &pCsr->nToken,
&pCsr->iStart, &pCsr->iEnd, &pCsr->iPos
);
if( rc!=SQLITE_OK ){
fts3tokResetCursor(pCsr);
if( rc==SQLITE_DONE ) rc = SQLITE_OK;
}
return rc;
}
/*
** xFilter - Initialize a cursor to point at the start of its data.
*/
static int fts3tokFilterMethod(
sqlite3_vtab_cursor *pCursor, /* The cursor used for this query */
int idxNum, /* Strategy index */
const char *idxStr, /* Unused */
int nVal, /* Number of elements in apVal */
sqlite3_value **apVal /* Arguments for the indexing scheme */
){
int rc = SQLITE_ERROR;
Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
Fts3tokTable *pTab = (Fts3tokTable *)(pCursor->pVtab);
UNUSED_PARAMETER(idxStr);
UNUSED_PARAMETER(nVal);
fts3tokResetCursor(pCsr);
if( idxNum==1 ){
const char *zByte = (const char *)sqlite3_value_text(apVal[0]);
int nByte = sqlite3_value_bytes(apVal[0]);
pCsr->zInput = sqlite3_malloc64(nByte+1);
if( pCsr->zInput==0 ){
rc = SQLITE_NOMEM;
}else{
if( nByte>0 ) memcpy(pCsr->zInput, zByte, nByte);
pCsr->zInput[nByte] = 0;
rc = pTab->pMod->xOpen(pTab->pTok, pCsr->zInput, nByte, &pCsr->pCsr);
if( rc==SQLITE_OK ){
pCsr->pCsr->pTokenizer = pTab->pTok;
}
}
}
if( rc!=SQLITE_OK ) return rc;
return fts3tokNextMethod(pCursor);
}
/*
** xEof - Return true if the cursor is at EOF, or false otherwise.
*/
static int fts3tokEofMethod(sqlite3_vtab_cursor *pCursor){
Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
return (pCsr->zToken==0);
}
/*
** xColumn - Return a column value.
*/
static int fts3tokColumnMethod(
sqlite3_vtab_cursor *pCursor, /* Cursor to retrieve value from */
sqlite3_context *pCtx, /* Context for sqlite3_result_xxx() calls */
int iCol /* Index of column to read value from */
){
Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
/* CREATE TABLE x(input, token, start, end, position) */
switch( iCol ){
case 0:
sqlite3_result_text(pCtx, pCsr->zInput, -1, SQLITE_TRANSIENT);
break;
case 1:
sqlite3_result_text(pCtx, pCsr->zToken, pCsr->nToken, SQLITE_TRANSIENT);
break;
case 2:
sqlite3_result_int(pCtx, pCsr->iStart);
break;
case 3:
sqlite3_result_int(pCtx, pCsr->iEnd);
break;
default:
assert( iCol==4 );
sqlite3_result_int(pCtx, pCsr->iPos);
break;
}
return SQLITE_OK;
}
/*
** xRowid - Return the current rowid for the cursor.
*/
static int fts3tokRowidMethod(
sqlite3_vtab_cursor *pCursor, /* Cursor to retrieve value from */
sqlite_int64 *pRowid /* OUT: Rowid value */
){
Fts3tokCursor *pCsr = (Fts3tokCursor *)pCursor;
*pRowid = (sqlite3_int64)pCsr->iRowid;
return SQLITE_OK;
}
/*
** Register the fts3tok module with database connection db. Return SQLITE_OK
** if successful or an error code if sqlite3_create_module() fails.
*/
int sqlite3Fts3InitTok(sqlite3 *db, Fts3Hash *pHash, void(*xDestroy)(void*)){
static const sqlite3_module fts3tok_module = {
0, /* iVersion */
fts3tokConnectMethod, /* xCreate */
fts3tokConnectMethod, /* xConnect */
fts3tokBestIndexMethod, /* xBestIndex */
fts3tokDisconnectMethod, /* xDisconnect */
fts3tokDisconnectMethod, /* xDestroy */
fts3tokOpenMethod, /* xOpen */
fts3tokCloseMethod, /* xClose */
fts3tokFilterMethod, /* xFilter */
fts3tokNextMethod, /* xNext */
fts3tokEofMethod, /* xEof */
fts3tokColumnMethod, /* xColumn */
fts3tokRowidMethod, /* xRowid */
0, /* xUpdate */
0, /* xBegin */
0, /* xSync */
0, /* xCommit */
0, /* xRollback */
0, /* xFindFunction */
0, /* xRename */
0, /* xSavepoint */
0, /* xRelease */
0, /* xRollbackTo */
0 /* xShadowName */
};
int rc; /* Return code */
rc = sqlite3_create_module_v2(
db, "fts3tokenize", &fts3tok_module, (void*)pHash, xDestroy
);
return rc;
}
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
| 13,565 | 459 | jart/cosmopolitan | false |
cosmopolitan/third_party/sqlite3/attach.shell.c | #include "third_party/sqlite3/attach.c"
| 40 | 2 | jart/cosmopolitan | false |
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