File size: 11,900 Bytes
3dcad1f |
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 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 |
;;;; Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2014
;;;; Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;;;
(define-module (ice-9 scm-style-repl)
#:use-module (ice-9 save-stack)
#:export (scm-repl-silent
scm-repl-print-unspecified
scm-repl-verbose
scm-repl-prompt
assert-repl-silence
assert-repl-print-unspecified
assert-repl-verbosity
default-pre-unwind-handler
bad-throw
error-catching-loop
error-catching-repl
scm-style-repl
handle-system-error))
(define scm-repl-silent #f)
(define (assert-repl-silence v) (set! scm-repl-silent v))
(define scm-repl-print-unspecified #f)
(define (assert-repl-print-unspecified v) (set! scm-repl-print-unspecified v))
(define scm-repl-verbose #f)
(define (assert-repl-verbosity v) (set! scm-repl-verbose v))
(define scm-repl-prompt "guile> ")
;; bad-throw is the hook that is called upon a throw to a an unhandled
;; key (unless the throw has four arguments, in which case
;; it's usually interpreted as an error throw.)
;; If the key has a default handler (a throw-handler-default property),
;; it is applied to the throw.
;;
(define (bad-throw key . args)
(let ((default (symbol-property key 'throw-handler-default)))
(or (and default (apply default key args))
(apply error "unhandled-exception:" key args))))
(define (default-pre-unwind-handler key . args)
;; Narrow by two more frames: this one, and the throw handler.
(save-stack 2)
(apply throw key args))
(define has-shown-debugger-hint? #f)
(define (error-catching-loop thunk)
(let ((status #f)
(interactive #t))
(define (loop first)
(let ((next
(catch #t
(lambda ()
(call-with-unblocked-asyncs
(lambda ()
(first)
;; This line is needed because mark
;; doesn't do closures quite right.
;; Unreferenced locals should be
;; collected.
(set! first #f)
(let loop ((v (thunk)))
(loop (thunk)))
#f)))
(lambda (key . args)
(case key
((quit)
(set! status args)
#f)
((switch-repl)
(apply throw 'switch-repl args))
((abort)
;; This is one of the closures that require
;; (set! first #f) above
;;
(lambda ()
(run-hook abort-hook)
(force-output (current-output-port))
(display "ABORT: " (current-error-port))
(write args (current-error-port))
(newline (current-error-port))
(if interactive
(begin
(if (and
(not has-shown-debugger-hint?)
(not (memq 'backtrace
(debug-options-interface)))
(stack? (fluid-ref the-last-stack)))
(begin
(newline (current-error-port))
(display
"Type \"(backtrace)\" to get more information or \"(debug)\" to enter the debugger.\n"
(current-error-port))
(set! has-shown-debugger-hint? #t)))
(force-output (current-error-port)))
(begin
(primitive-exit 1)))
(set! stack-saved? #f)))
(else
;; This is the other cons-leak closure...
(lambda ()
(cond ((= (length args) 4)
(apply handle-system-error key args))
(else
(apply bad-throw key args)))))))
default-pre-unwind-handler)))
(if next (loop next) status)))
(set! ensure-batch-mode! (lambda ()
(set! interactive #f)
(restore-signals)))
(set! batch-mode? (lambda () (not interactive)))
(call-with-blocked-asyncs
(lambda () (loop (lambda () #t))))))
(define (error-catching-repl r e p)
(error-catching-loop
(lambda ()
(call-with-values (lambda () (e (r)))
(lambda the-values (for-each p the-values))))))
(define (scm-style-repl)
(letrec (
(start-gc-rt #f)
(start-rt #f)
(repl-report-start-timing (lambda ()
(set! start-gc-rt (gc-run-time))
(set! start-rt (get-internal-run-time))))
(repl-report (lambda ()
(display ";;; ")
(display (inexact->exact
(* 1000 (/ (- (get-internal-run-time) start-rt)
internal-time-units-per-second))))
(display " msec (")
(display (inexact->exact
(* 1000 (/ (- (gc-run-time) start-gc-rt)
internal-time-units-per-second))))
(display " msec in gc)\n")))
(consume-trailing-whitespace
(lambda ()
(let ((ch (peek-char)))
(cond
((eof-object? ch))
((or (char=? ch #\space) (char=? ch #\tab))
(read-char)
(consume-trailing-whitespace))
((char=? ch #\newline)
(read-char))))))
(-read (lambda ()
(let ((val
(let ((prompt (cond ((string? scm-repl-prompt)
scm-repl-prompt)
((thunk? scm-repl-prompt)
(scm-repl-prompt))
(scm-repl-prompt "> ")
(else ""))))
(repl-reader prompt))))
;; As described in R4RS, the READ procedure updates the
;; port to point to the first character past the end of
;; the external representation of the object. This
;; means that it doesn't consume the newline typically
;; found after an expression. This means that, when
;; debugging Guile with GDB, GDB gets the newline, which
;; it often interprets as a "continue" command, making
;; breakpoints kind of useless. So, consume any
;; trailing newline here, as well as any whitespace
;; before it.
;; But not if EOF, for control-D.
(if (not (eof-object? val))
(consume-trailing-whitespace))
(run-hook after-read-hook)
(if (eof-object? val)
(begin
(repl-report-start-timing)
(if scm-repl-verbose
(begin
(newline)
(display ";;; EOF -- quitting")
(newline)))
(quit 0)))
val)))
(-eval (lambda (sourc)
(repl-report-start-timing)
(run-hook before-eval-hook sourc)
(let ((val (start-stack 'repl-stack
;; If you change this procedure
;; (primitive-eval), please also
;; modify the repl-stack case in
;; save-stack so that stack cutting
;; continues to work.
(primitive-eval sourc))))
(run-hook after-eval-hook sourc)
val)))
(-print (let ((maybe-print (lambda (result)
(if (or scm-repl-print-unspecified
(not (unspecified? result)))
(begin
(write result)
(newline))))))
(lambda (result)
(if (not scm-repl-silent)
(begin
(run-hook before-print-hook result)
(maybe-print result)
(run-hook after-print-hook result)
(if scm-repl-verbose
(repl-report))
(force-output))))))
(-quit (lambda (args)
(if scm-repl-verbose
(begin
(display ";;; QUIT executed, repl exitting")
(newline)
(repl-report)))
args)))
(let ((status (error-catching-repl -read
-eval
-print)))
(-quit status))))
(define (handle-system-error key . args)
(let ((cep (current-error-port)))
(cond ((not (stack? (fluid-ref the-last-stack))))
((memq 'backtrace (debug-options-interface))
(let ((highlights (if (or (eq? key 'wrong-type-arg)
(eq? key 'out-of-range))
(list-ref args 3)
'())))
(run-hook before-backtrace-hook)
(newline cep)
(display "Backtrace:\n")
(display-backtrace (fluid-ref the-last-stack) cep
#f #f highlights)
(newline cep)
(run-hook after-backtrace-hook))))
(run-hook before-error-hook)
(apply display-error (fluid-ref the-last-stack) cep args)
(run-hook after-error-hook)
(force-output cep)
(throw 'abort key)))
|