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from ctypes import (c_char_p, byref, POINTER, c_bool, create_string_buffer,
c_size_t, string_at)
from llvmlite.binding import ffi
from llvmlite.binding.linker import link_modules
from llvmlite.binding.common import _decode_string, _encode_string
from llvmlite.binding.value import ValueRef, TypeRef
from llvmlite.binding.context import get_global_context
def parse_assembly(llvmir, context=None):
"""
Create Module from a LLVM IR string
"""
if context is None:
context = get_global_context()
llvmir = _encode_string(llvmir)
strbuf = c_char_p(llvmir)
with ffi.OutputString() as errmsg:
mod = ModuleRef(
ffi.lib.LLVMPY_ParseAssembly(context, strbuf, errmsg),
context)
if errmsg:
mod.close()
raise RuntimeError("LLVM IR parsing error\n{0}".format(errmsg))
return mod
def parse_bitcode(bitcode, context=None):
"""
Create Module from a LLVM *bitcode* (a bytes object).
"""
if context is None:
context = get_global_context()
buf = c_char_p(bitcode)
bufsize = len(bitcode)
with ffi.OutputString() as errmsg:
mod = ModuleRef(ffi.lib.LLVMPY_ParseBitcode(
context, buf, bufsize, errmsg), context)
if errmsg:
mod.close()
raise RuntimeError(
"LLVM bitcode parsing error\n{0}".format(errmsg))
return mod
class ModuleRef(ffi.ObjectRef):
"""
A reference to a LLVM module.
"""
def __init__(self, module_ptr, context):
super(ModuleRef, self).__init__(module_ptr)
self._context = context
def __str__(self):
with ffi.OutputString() as outstr:
ffi.lib.LLVMPY_PrintModuleToString(self, outstr)
return str(outstr)
def as_bitcode(self):
"""
Return the module's LLVM bitcode, as a bytes object.
"""
ptr = c_char_p(None)
size = c_size_t(-1)
ffi.lib.LLVMPY_WriteBitcodeToString(self, byref(ptr), byref(size))
if not ptr:
raise MemoryError
try:
assert size.value >= 0
return string_at(ptr, size.value)
finally:
ffi.lib.LLVMPY_DisposeString(ptr)
def _dispose(self):
self._capi.LLVMPY_DisposeModule(self)
def get_function(self, name):
"""
Get a ValueRef pointing to the function named *name*.
NameError is raised if the symbol isn't found.
"""
p = ffi.lib.LLVMPY_GetNamedFunction(self, _encode_string(name))
if not p:
raise NameError(name)
return ValueRef(p, 'function', dict(module=self))
def get_global_variable(self, name):
"""
Get a ValueRef pointing to the global variable named *name*.
NameError is raised if the symbol isn't found.
"""
p = ffi.lib.LLVMPY_GetNamedGlobalVariable(self, _encode_string(name))
if not p:
raise NameError(name)
return ValueRef(p, 'global', dict(module=self))
def get_struct_type(self, name):
"""
Get a TypeRef pointing to a structure type named *name*.
NameError is raised if the struct type isn't found.
"""
p = ffi.lib.LLVMPY_GetNamedStructType(self, _encode_string(name))
if not p:
raise NameError(name)
return TypeRef(p)
def verify(self):
"""
Verify the module IR's correctness. RuntimeError is raised on error.
"""
with ffi.OutputString() as outmsg:
if ffi.lib.LLVMPY_VerifyModule(self, outmsg):
raise RuntimeError(str(outmsg))
@property
def name(self):
"""
The module's identifier.
"""
return _decode_string(ffi.lib.LLVMPY_GetModuleName(self))
@name.setter
def name(self, value):
ffi.lib.LLVMPY_SetModuleName(self, _encode_string(value))
@property
def source_file(self):
"""
The module's original source file name
"""
return _decode_string(ffi.lib.LLVMPY_GetModuleSourceFileName(self))
@property
def data_layout(self):
"""
This module's data layout specification, as a string.
"""
# LLVMGetDataLayout() points inside a std::string managed by LLVM.
with ffi.OutputString(owned=False) as outmsg:
ffi.lib.LLVMPY_GetDataLayout(self, outmsg)
return str(outmsg)
@data_layout.setter
def data_layout(self, strrep):
ffi.lib.LLVMPY_SetDataLayout(self,
create_string_buffer(
strrep.encode('utf8')))
@property
def triple(self):
"""
This module's target "triple" specification, as a string.
"""
# LLVMGetTarget() points inside a std::string managed by LLVM.
with ffi.OutputString(owned=False) as outmsg:
ffi.lib.LLVMPY_GetTarget(self, outmsg)
return str(outmsg)
@triple.setter
def triple(self, strrep):
ffi.lib.LLVMPY_SetTarget(self,
create_string_buffer(
strrep.encode('utf8')))
def link_in(self, other, preserve=False):
"""
Link the *other* module into this one. The *other* module will
be destroyed unless *preserve* is true.
"""
if preserve:
other = other.clone()
link_modules(self, other)
@property
def global_variables(self):
"""
Return an iterator over this module's global variables.
The iterator will yield a ValueRef for each global variable.
Note that global variables don't include functions
(a function is a "global value" but not a "global variable" in
LLVM parlance)
"""
it = ffi.lib.LLVMPY_ModuleGlobalsIter(self)
return _GlobalsIterator(it, dict(module=self))
@property
def functions(self):
"""
Return an iterator over this module's functions.
The iterator will yield a ValueRef for each function.
"""
it = ffi.lib.LLVMPY_ModuleFunctionsIter(self)
return _FunctionsIterator(it, dict(module=self))
@property
def struct_types(self):
"""
Return an iterator over the struct types defined in
the module. The iterator will yield a TypeRef.
"""
it = ffi.lib.LLVMPY_ModuleTypesIter(self)
return _TypesIterator(it, dict(module=self))
def clone(self):
return ModuleRef(ffi.lib.LLVMPY_CloneModule(self), self._context)
class _Iterator(ffi.ObjectRef):
kind = None
def __init__(self, ptr, parents):
ffi.ObjectRef.__init__(self, ptr)
self._parents = parents
assert self.kind is not None
def __next__(self):
vp = self._next()
if vp:
return ValueRef(vp, self.kind, self._parents)
else:
raise StopIteration
next = __next__
def __iter__(self):
return self
class _GlobalsIterator(_Iterator):
kind = 'global'
def _dispose(self):
self._capi.LLVMPY_DisposeGlobalsIter(self)
def _next(self):
return ffi.lib.LLVMPY_GlobalsIterNext(self)
class _FunctionsIterator(_Iterator):
kind = 'function'
def _dispose(self):
self._capi.LLVMPY_DisposeFunctionsIter(self)
def _next(self):
return ffi.lib.LLVMPY_FunctionsIterNext(self)
class _TypesIterator(_Iterator):
kind = 'type'
def _dispose(self):
self._capi.LLVMPY_DisposeTypesIter(self)
def __next__(self):
vp = self._next()
if vp:
return TypeRef(vp)
else:
raise StopIteration
def _next(self):
return ffi.lib.LLVMPY_TypesIterNext(self)
next = __next__
# =============================================================================
# Set function FFI
ffi.lib.LLVMPY_ParseAssembly.argtypes = [ffi.LLVMContextRef,
c_char_p,
POINTER(c_char_p)]
ffi.lib.LLVMPY_ParseAssembly.restype = ffi.LLVMModuleRef
ffi.lib.LLVMPY_ParseBitcode.argtypes = [ffi.LLVMContextRef,
c_char_p, c_size_t,
POINTER(c_char_p)]
ffi.lib.LLVMPY_ParseBitcode.restype = ffi.LLVMModuleRef
ffi.lib.LLVMPY_DisposeModule.argtypes = [ffi.LLVMModuleRef]
ffi.lib.LLVMPY_PrintModuleToString.argtypes = [ffi.LLVMModuleRef,
POINTER(c_char_p)]
ffi.lib.LLVMPY_WriteBitcodeToString.argtypes = [ffi.LLVMModuleRef,
POINTER(c_char_p),
POINTER(c_size_t)]
ffi.lib.LLVMPY_GetNamedFunction.argtypes = [ffi.LLVMModuleRef,
c_char_p]
ffi.lib.LLVMPY_GetNamedFunction.restype = ffi.LLVMValueRef
ffi.lib.LLVMPY_VerifyModule.argtypes = [ffi.LLVMModuleRef,
POINTER(c_char_p)]
ffi.lib.LLVMPY_VerifyModule.restype = c_bool
ffi.lib.LLVMPY_GetDataLayout.argtypes = [ffi.LLVMModuleRef, POINTER(c_char_p)]
ffi.lib.LLVMPY_SetDataLayout.argtypes = [ffi.LLVMModuleRef, c_char_p]
ffi.lib.LLVMPY_GetTarget.argtypes = [ffi.LLVMModuleRef, POINTER(c_char_p)]
ffi.lib.LLVMPY_SetTarget.argtypes = [ffi.LLVMModuleRef, c_char_p]
ffi.lib.LLVMPY_GetNamedGlobalVariable.argtypes = [ffi.LLVMModuleRef, c_char_p]
ffi.lib.LLVMPY_GetNamedGlobalVariable.restype = ffi.LLVMValueRef
ffi.lib.LLVMPY_GetNamedStructType.argtypes = [ffi.LLVMModuleRef, c_char_p]
ffi.lib.LLVMPY_GetNamedStructType.restype = ffi.LLVMTypeRef
ffi.lib.LLVMPY_ModuleGlobalsIter.argtypes = [ffi.LLVMModuleRef]
ffi.lib.LLVMPY_ModuleGlobalsIter.restype = ffi.LLVMGlobalsIterator
ffi.lib.LLVMPY_DisposeGlobalsIter.argtypes = [ffi.LLVMGlobalsIterator]
ffi.lib.LLVMPY_GlobalsIterNext.argtypes = [ffi.LLVMGlobalsIterator]
ffi.lib.LLVMPY_GlobalsIterNext.restype = ffi.LLVMValueRef
ffi.lib.LLVMPY_ModuleFunctionsIter.argtypes = [ffi.LLVMModuleRef]
ffi.lib.LLVMPY_ModuleFunctionsIter.restype = ffi.LLVMFunctionsIterator
ffi.lib.LLVMPY_ModuleTypesIter.argtypes = [ffi.LLVMModuleRef]
ffi.lib.LLVMPY_ModuleTypesIter.restype = ffi.LLVMTypesIterator
ffi.lib.LLVMPY_DisposeFunctionsIter.argtypes = [ffi.LLVMFunctionsIterator]
ffi.lib.LLVMPY_DisposeTypesIter.argtypes = [ffi.LLVMTypesIterator]
ffi.lib.LLVMPY_FunctionsIterNext.argtypes = [ffi.LLVMFunctionsIterator]
ffi.lib.LLVMPY_FunctionsIterNext.restype = ffi.LLVMValueRef
ffi.lib.LLVMPY_TypesIterNext.argtypes = [ffi.LLVMTypesIterator]
ffi.lib.LLVMPY_TypesIterNext.restype = ffi.LLVMTypeRef
ffi.lib.LLVMPY_CloneModule.argtypes = [ffi.LLVMModuleRef]
ffi.lib.LLVMPY_CloneModule.restype = ffi.LLVMModuleRef
ffi.lib.LLVMPY_GetModuleName.argtypes = [ffi.LLVMModuleRef]
ffi.lib.LLVMPY_GetModuleName.restype = c_char_p
ffi.lib.LLVMPY_SetModuleName.argtypes = [ffi.LLVMModuleRef, c_char_p]
ffi.lib.LLVMPY_GetModuleSourceFileName.argtypes = [ffi.LLVMModuleRef]
ffi.lib.LLVMPY_GetModuleSourceFileName.restype = c_char_p
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