Commit | Line | Data |
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ab4f3efb | 1 | /* Printing of backtraces and error messages |
1e598865 | 2 | * Copyright (C) 1996,1997 Free Software Foundation |
ab4f3efb MD |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2, or (at your option) | |
7 | * any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
16 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
17 | * Boston, MA 02111-1307 USA | |
ab4f3efb MD |
18 | * |
19 | * As a special exception, the Free Software Foundation gives permission | |
20 | * for additional uses of the text contained in its release of GUILE. | |
21 | * | |
22 | * The exception is that, if you link the GUILE library with other files | |
23 | * to produce an executable, this does not by itself cause the | |
24 | * resulting executable to be covered by the GNU General Public License. | |
25 | * Your use of that executable is in no way restricted on account of | |
26 | * linking the GUILE library code into it. | |
27 | * | |
28 | * This exception does not however invalidate any other reasons why | |
29 | * the executable file might be covered by the GNU General Public License. | |
30 | * | |
31 | * This exception applies only to the code released by the | |
32 | * Free Software Foundation under the name GUILE. If you copy | |
33 | * code from other Free Software Foundation releases into a copy of | |
34 | * GUILE, as the General Public License permits, the exception does | |
35 | * not apply to the code that you add in this way. To avoid misleading | |
36 | * anyone as to the status of such modified files, you must delete | |
37 | * this exception notice from them. | |
38 | * | |
39 | * If you write modifications of your own for GUILE, it is your choice | |
40 | * whether to permit this exception to apply to your modifications. | |
41 | * If you do not wish that, delete this exception notice. | |
42 | * | |
43 | * The author can be reached at djurfeldt@nada.kth.se | |
82892bed | 44 | * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN */ |
ab4f3efb MD |
45 | |
46 | #include <stdio.h> | |
47 | #include "_scm.h" | |
48 | #include "stacks.h" | |
49 | #include "srcprop.h" | |
50 | #include "genio.h" | |
51 | #include "struct.h" | |
52 | #include "strports.h" | |
bdf8afff | 53 | #include "throw.h" |
a5d6d578 | 54 | #include "fluids.h" |
ab4f3efb MD |
55 | |
56 | #include "backtrace.h" | |
57 | ||
58 | /* {Error reporting and backtraces} | |
59 | * (A first approximation.) | |
60 | * | |
61 | * Note that these functions shouldn't generate errors themselves. | |
62 | */ | |
63 | ||
64 | #ifndef SCM_RECKLESS | |
65 | #undef SCM_ASSERT | |
66 | #define SCM_ASSERT(_cond, _arg, _pos, _subr) \ | |
67 | if (!(_cond)) \ | |
68 | return SCM_BOOL_F; | |
69 | #endif | |
70 | ||
b6609fc7 MD |
71 | SCM scm_the_last_stack_fluid; |
72 | ||
ab4f3efb MD |
73 | static void display_header SCM_P ((SCM source, SCM port)); |
74 | static void | |
75 | display_header (source, port) | |
76 | SCM source; | |
77 | SCM port; | |
78 | { | |
79 | SCM fname = (SCM_NIMP (source) && SCM_MEMOIZEDP (source) | |
80 | ? scm_source_property (source, scm_i_filename) | |
81 | : SCM_BOOL_F); | |
82 | if (SCM_NIMP (fname) && SCM_STRINGP (fname)) | |
83 | { | |
84 | scm_prin1 (fname, port, 0); | |
b7f3516f | 85 | scm_putc (':', port); |
ab4f3efb | 86 | scm_prin1 (scm_source_property (source, scm_i_line), port, 0); |
b7f3516f | 87 | scm_putc (':', port); |
ab4f3efb MD |
88 | scm_prin1 (scm_source_property (source, scm_i_column), port, 0); |
89 | } | |
90 | else | |
b7f3516f TT |
91 | scm_puts ("ERROR", port); |
92 | scm_puts (": ", port); | |
ab4f3efb MD |
93 | } |
94 | ||
f3acc5c1 JB |
95 | |
96 | void | |
97 | scm_display_error_message (message, args, port) | |
ab4f3efb MD |
98 | SCM message; |
99 | SCM args; | |
100 | SCM port; | |
101 | { | |
102 | int writingp; | |
103 | char *start; | |
104 | char *p; | |
105 | ||
89958ad0 | 106 | if (SCM_IMP (message) || !SCM_ROSTRINGP (message) || SCM_IMP (args) |
c37e0e55 | 107 | || !scm_list_p (args)) |
ab4f3efb MD |
108 | { |
109 | scm_prin1 (message, port, 0); | |
b7f3516f | 110 | scm_putc ('\n', port); |
ab4f3efb MD |
111 | return; |
112 | } | |
113 | ||
89958ad0 JB |
114 | SCM_COERCE_SUBSTR (message); |
115 | start = SCM_ROCHARS (message); | |
ab4f3efb MD |
116 | for (p = start; *p != '\0'; ++p) |
117 | if (*p == '%') | |
118 | { | |
119 | if (SCM_IMP (args) || SCM_NCONSP (args)) | |
120 | continue; | |
121 | ||
122 | ++p; | |
123 | if (*p == 's') | |
124 | writingp = 0; | |
125 | else if (*p == 'S') | |
126 | writingp = 1; | |
127 | else | |
128 | continue; | |
129 | ||
b7f3516f | 130 | scm_lfwrite (start, p - start - 1, port); |
ab4f3efb MD |
131 | scm_prin1 (SCM_CAR (args), port, writingp); |
132 | args = SCM_CDR (args); | |
133 | start = p + 1; | |
134 | } | |
b7f3516f TT |
135 | scm_lfwrite (start, p - start, port); |
136 | scm_putc ('\n', port); | |
ab4f3efb MD |
137 | } |
138 | ||
139 | static void display_expression SCM_P ((SCM frame, SCM pname, SCM source, SCM port)); | |
140 | static void | |
141 | display_expression (frame, pname, source, port) | |
142 | SCM frame; | |
143 | SCM pname; | |
144 | SCM source; | |
145 | SCM port; | |
146 | { | |
147 | SCM print_state = scm_make_print_state (); | |
148 | scm_print_state *pstate = SCM_PRINT_STATE (print_state); | |
149 | pstate->writingp = 0; | |
150 | pstate->fancyp = 1; | |
151 | pstate->level = 2; | |
152 | pstate->length = 3; | |
153 | if (SCM_NIMP (pname) && SCM_ROSTRINGP (pname)) | |
154 | { | |
155 | if (SCM_NIMP (frame) | |
156 | && SCM_FRAMEP (frame) | |
157 | && SCM_FRAME_EVAL_ARGS_P (frame)) | |
b7f3516f | 158 | scm_puts ("While evaluating arguments to ", port); |
ab4f3efb | 159 | else |
b7f3516f | 160 | scm_puts ("In procedure ", port); |
ab4f3efb MD |
161 | scm_iprin1 (pname, port, pstate); |
162 | if (SCM_NIMP (source) && SCM_MEMOIZEDP (source)) | |
163 | { | |
b7f3516f | 164 | scm_puts (" in expression ", port); |
ab4f3efb MD |
165 | pstate->writingp = 1; |
166 | scm_iprin1 (scm_unmemoize (source), port, pstate); | |
167 | } | |
168 | } | |
169 | else if (SCM_NIMP (source)) | |
170 | { | |
b7f3516f | 171 | scm_puts ("In expression ", port); |
ab4f3efb MD |
172 | pstate->writingp = 1; |
173 | scm_iprin1 (scm_unmemoize (source), port, pstate); | |
174 | } | |
b7f3516f | 175 | scm_puts (":\n", port); |
ab4f3efb MD |
176 | scm_free_print_state (print_state); |
177 | } | |
178 | ||
bdf8afff MD |
179 | struct display_error_args { |
180 | SCM stack; | |
181 | SCM port; | |
182 | SCM subr; | |
183 | SCM message; | |
184 | SCM args; | |
185 | SCM rest; | |
186 | }; | |
187 | ||
188 | static SCM | |
189 | display_error_body (struct display_error_args *a, SCM jmpbuf) | |
ab4f3efb MD |
190 | { |
191 | SCM current_frame = SCM_BOOL_F; | |
192 | SCM source = SCM_BOOL_F; | |
193 | SCM pname = SCM_BOOL_F; | |
841076ac | 194 | if (SCM_DEBUGGINGP |
bdf8afff MD |
195 | && SCM_NIMP (a->stack) |
196 | && SCM_STACKP (a->stack) | |
197 | && SCM_STACK_LENGTH (a->stack) > 0) | |
ab4f3efb | 198 | { |
bdf8afff | 199 | current_frame = scm_stack_ref (a->stack, SCM_INUM0); |
ab4f3efb MD |
200 | source = SCM_FRAME_SOURCE (current_frame); |
201 | if (!(SCM_NIMP (source) && SCM_MEMOIZEDP (source))) | |
202 | source = SCM_FRAME_SOURCE (SCM_FRAME_PREV (current_frame)); | |
203 | if (SCM_FRAME_PROC_P (current_frame) | |
016e2ce1 | 204 | && scm_procedure_p (SCM_FRAME_PROC (current_frame)) == SCM_BOOL_T) |
ab4f3efb MD |
205 | pname = scm_procedure_name (SCM_FRAME_PROC (current_frame)); |
206 | } | |
207 | if (!(SCM_NIMP (pname) && SCM_ROSTRINGP (pname))) | |
bdf8afff | 208 | pname = a->subr; |
ab4f3efb MD |
209 | if ((SCM_NIMP (source) && SCM_MEMOIZEDP (source)) |
210 | || (SCM_NIMP (pname) && SCM_ROSTRINGP (pname))) | |
211 | { | |
bdf8afff MD |
212 | display_header (source, a->port); |
213 | display_expression (current_frame, pname, source, a->port); | |
ab4f3efb | 214 | } |
bdf8afff MD |
215 | display_header (source, a->port); |
216 | scm_display_error_message (a->message, a->args, a->port); | |
217 | return SCM_UNSPECIFIED; | |
218 | } | |
219 | ||
220 | struct display_error_handler_data { | |
221 | char *mode; | |
222 | SCM port; | |
223 | }; | |
224 | ||
225 | /* This is the exception handler for error reporting routines. | |
226 | Note that it is very important that this handler *doesn't* try to | |
227 | print more than the error tag, since the error very probably is | |
228 | caused by an erroneous print call-back routine. If we would | |
229 | tru to print all objects, we would enter an infinite loop. */ | |
230 | static SCM | |
231 | display_error_handler (struct display_error_handler_data *data, | |
232 | SCM tag, SCM args) | |
233 | { | |
234 | SCM print_state = scm_make_print_state (); | |
b7f3516f TT |
235 | scm_puts ("\nException during displaying of ", data->port); |
236 | scm_puts (data->mode, data->port); | |
237 | scm_puts (": ", data->port); | |
bdf8afff | 238 | scm_iprin1 (tag, data->port, SCM_PRINT_STATE (print_state)); |
b7f3516f | 239 | scm_putc ('\n', data->port); |
bdf8afff MD |
240 | return SCM_UNSPECIFIED; |
241 | } | |
242 | ||
243 | SCM_PROC(s_display_error, "display-error", 6, 0, 0, scm_display_error); | |
244 | SCM | |
245 | scm_display_error (stack, port, subr, message, args, rest) | |
246 | SCM stack; | |
247 | SCM port; | |
248 | SCM subr; | |
249 | SCM message; | |
250 | SCM args; | |
251 | SCM rest; | |
252 | { | |
253 | struct display_error_args a = { stack, port, subr, message, args, rest }; | |
254 | struct display_error_handler_data data = { "error", port }; | |
255 | scm_internal_catch (SCM_BOOL_T, | |
256 | (scm_catch_body_t) display_error_body, &a, | |
257 | (scm_catch_handler_t) display_error_handler, &data); | |
ab4f3efb MD |
258 | return SCM_UNSPECIFIED; |
259 | } | |
260 | ||
261 | static void indent SCM_P ((int n, SCM port)); | |
262 | static void | |
263 | indent (n, port) | |
264 | int n; | |
265 | SCM port; | |
266 | { | |
267 | int i; | |
268 | for (i = 0; i < n; ++i) | |
b7f3516f | 269 | scm_putc (' ', port); |
ab4f3efb MD |
270 | } |
271 | ||
272 | static void display_frame_expr SCM_P ((char *hdr, SCM exp, char *tlr, int indentation, SCM sport, SCM port, scm_print_state *pstate)); | |
273 | static void | |
274 | display_frame_expr (hdr, exp, tlr, indentation, sport, port, pstate) | |
275 | char *hdr; | |
276 | SCM exp; | |
277 | char *tlr; | |
278 | int indentation; | |
279 | SCM sport; | |
280 | SCM port; | |
281 | scm_print_state *pstate; | |
282 | { | |
ab4f3efb MD |
283 | if (SCM_NIMP (exp) && SCM_CONSP (exp)) |
284 | { | |
285 | scm_iprlist (hdr, exp, tlr[0], port, pstate); | |
b7f3516f | 286 | scm_puts (&tlr[1], port); |
ab4f3efb MD |
287 | } |
288 | else | |
289 | scm_iprin1 (exp, port, pstate); | |
b7f3516f | 290 | scm_putc ('\n', port); |
ab4f3efb MD |
291 | } |
292 | ||
e3c37929 MD |
293 | static void display_application SCM_P ((SCM frame, int indentation, SCM sport, SCM port, scm_print_state *pstate)); |
294 | static void | |
295 | display_application (frame, indentation, sport, port, pstate) | |
296 | SCM frame; | |
297 | int indentation; | |
298 | SCM sport; | |
299 | SCM port; | |
300 | scm_print_state *pstate; | |
301 | { | |
302 | SCM proc = SCM_FRAME_PROC (frame); | |
303 | SCM name = (SCM_NFALSEP (scm_procedure_p (proc)) | |
304 | ? scm_procedure_name (proc) | |
305 | : SCM_BOOL_F); | |
306 | display_frame_expr ("[", | |
307 | scm_cons (SCM_NFALSEP (name) ? name : proc, | |
308 | SCM_FRAME_ARGS (frame)), | |
309 | SCM_FRAME_EVAL_ARGS_P (frame) ? " ..." : "]", | |
310 | indentation, | |
311 | sport, | |
312 | port, | |
313 | pstate); | |
314 | } | |
315 | ||
316 | SCM_PROC(s_display_application, "display-application", 1, 1, 0, scm_display_application); | |
317 | ||
318 | SCM | |
319 | scm_display_application (SCM frame, SCM port) | |
320 | { | |
321 | if (SCM_UNBNDP (port)) | |
322 | port = scm_cur_outp; | |
323 | if (SCM_FRAME_PROC_P (frame)) | |
324 | /* Display an application. */ | |
325 | { | |
326 | SCM print_state; | |
327 | scm_print_state *pstate; | |
328 | ||
329 | /* Create a print state for printing of frames. */ | |
330 | print_state = scm_make_print_state (); | |
331 | pstate = SCM_PRINT_STATE (print_state); | |
332 | pstate->writingp = 1; | |
333 | pstate->fancyp = 1; | |
334 | pstate->level = 2; | |
335 | pstate->length = 9; | |
336 | ||
337 | display_application (frame, 0, SCM_BOOL_F, port, pstate); /*fixme*/ | |
338 | return SCM_BOOL_T; | |
339 | } | |
340 | else | |
341 | return SCM_BOOL_F; | |
342 | } | |
343 | ||
ab4f3efb MD |
344 | static void display_frame SCM_P ((SCM frame, int nfield, int indentation, SCM sport, SCM port, scm_print_state *pstate)); |
345 | static void | |
346 | display_frame (frame, nfield, indentation, sport, port, pstate) | |
347 | SCM frame; | |
348 | int nfield; | |
349 | int indentation; | |
350 | SCM sport; | |
351 | SCM port; | |
352 | scm_print_state *pstate; | |
353 | { | |
354 | int n, i, j; | |
355 | ||
356 | /* Announce missing frames? */ | |
357 | if (!SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
358 | { | |
359 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 360 | scm_puts ("...\n", port); |
ab4f3efb MD |
361 | } |
362 | ||
363 | /* Check size of frame number. */ | |
364 | n = SCM_FRAME_NUMBER (frame); | |
365 | for (i = 0, j = n; j > 0; ++i) j /= 10; | |
366 | ||
367 | /* Number indentation. */ | |
368 | indent (nfield - (i ? i : 1), port); | |
369 | ||
370 | /* Frame number. */ | |
371 | scm_iprin1 (SCM_MAKINUM (n), port, pstate); | |
372 | ||
373 | /* Real frame marker */ | |
b7f3516f | 374 | scm_putc (SCM_FRAME_REAL_P (frame) ? '*' : ' ', port); |
ab4f3efb MD |
375 | |
376 | /* Indentation. */ | |
377 | indent (indentation, port); | |
378 | ||
379 | if (SCM_FRAME_PROC_P (frame)) | |
380 | /* Display an application. */ | |
e3c37929 | 381 | display_application (frame, nfield + 1 + indentation, sport, port, pstate); |
ab4f3efb MD |
382 | else |
383 | /* Display a special form. */ | |
384 | { | |
385 | SCM source = SCM_FRAME_SOURCE (frame); | |
386 | SCM copy = scm_source_property (source, scm_i_copy); | |
387 | display_frame_expr ("(", | |
388 | SCM_NIMP (copy) && SCM_CONSP (copy) | |
389 | ? copy | |
390 | : scm_unmemoize (source), | |
391 | ")", | |
392 | nfield + 1 + indentation, | |
393 | sport, | |
394 | port, | |
395 | pstate); | |
396 | } | |
397 | ||
398 | /* Announce missing frames? */ | |
399 | if (SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
400 | { | |
401 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 402 | scm_puts ("...\n", port); |
ab4f3efb MD |
403 | } |
404 | } | |
405 | ||
bdf8afff MD |
406 | struct display_backtrace_args { |
407 | SCM stack; | |
408 | SCM port; | |
409 | SCM first; | |
410 | SCM depth; | |
411 | }; | |
412 | ||
ab4f3efb | 413 | SCM_PROC(s_display_backtrace, "display-backtrace", 2, 2, 0, scm_display_backtrace); |
bdf8afff MD |
414 | |
415 | static SCM | |
416 | display_backtrace_body (struct display_backtrace_args *a, SCM jmpbuf) | |
ab4f3efb MD |
417 | { |
418 | int n_frames, beg, end, n, i, j; | |
419 | int nfield, indent_p, indentation; | |
420 | SCM frame, sport, print_state; | |
421 | scm_print_state *pstate; | |
422 | ||
78446828 MV |
423 | a->port = SCM_COERCE_OUTPORT (a->port); |
424 | ||
ab4f3efb | 425 | /* Argument checking and extraction. */ |
bdf8afff MD |
426 | SCM_ASSERT (SCM_NIMP (a->stack) && SCM_STACKP (a->stack), |
427 | a->stack, | |
ab4f3efb MD |
428 | SCM_ARG1, |
429 | s_display_backtrace); | |
bdf8afff MD |
430 | SCM_ASSERT (SCM_NIMP (a->port) && SCM_OPOUTPORTP (a->port), |
431 | a->port, | |
ab4f3efb MD |
432 | SCM_ARG2, |
433 | s_display_backtrace); | |
bdf8afff MD |
434 | n_frames = SCM_INUM (scm_stack_length (a->stack)); |
435 | n = SCM_INUMP (a->depth) ? SCM_INUM (a->depth) : SCM_BACKTRACE_DEPTH; | |
ab4f3efb MD |
436 | if (SCM_BACKWARDS_P) |
437 | { | |
bdf8afff | 438 | beg = SCM_INUMP (a->first) ? SCM_INUM (a->first) : 0; |
ab4f3efb MD |
439 | end = beg + n - 1; |
440 | if (end >= n_frames) | |
441 | end = n_frames - 1; | |
442 | n = end - beg + 1; | |
443 | } | |
444 | else | |
445 | { | |
bdf8afff | 446 | if (SCM_INUMP (a->first)) |
ab4f3efb | 447 | { |
bdf8afff | 448 | beg = SCM_INUM (a->first); |
ab4f3efb MD |
449 | end = beg - n + 1; |
450 | if (end < 0) | |
451 | end = 0; | |
452 | } | |
453 | else | |
454 | { | |
455 | beg = n - 1; | |
456 | end = 0; | |
457 | if (beg >= n_frames) | |
458 | beg = n_frames - 1; | |
459 | } | |
460 | n = beg - end + 1; | |
461 | } | |
bdf8afff MD |
462 | SCM_ASSERT (beg >= 0 && beg < n_frames, a->first, SCM_ARG3, s_display_backtrace); |
463 | SCM_ASSERT (n > 0, a->depth, SCM_ARG4, s_display_backtrace); | |
ab4f3efb MD |
464 | |
465 | /* Create a string port used for adaptation of printing parameters. */ | |
466 | sport = scm_mkstrport (SCM_INUM0, | |
467 | scm_make_string (SCM_MAKINUM (240), SCM_UNDEFINED), | |
468 | SCM_OPN | SCM_WRTNG, | |
469 | s_display_backtrace); | |
470 | ||
471 | /* Create a print state for printing of frames. */ | |
472 | print_state = scm_make_print_state (); | |
473 | pstate = SCM_PRINT_STATE (print_state); | |
474 | pstate->writingp = 1; | |
475 | pstate->fancyp = 1; | |
e3c37929 MD |
476 | pstate->level = 2; |
477 | pstate->length = 3; | |
ab4f3efb MD |
478 | |
479 | /* First find out if it's reasonable to do indentation. */ | |
480 | if (SCM_BACKWARDS_P) | |
481 | indent_p = 0; | |
482 | else | |
483 | { | |
484 | indent_p = 1; | |
bdf8afff | 485 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb MD |
486 | for (i = 0, j = 0; i < n; ++i) |
487 | { | |
488 | if (SCM_FRAME_REAL_P (frame)) | |
489 | ++j; | |
490 | if (j > SCM_BACKTRACE_INDENT) | |
491 | { | |
492 | indent_p = 0; | |
493 | break; | |
494 | } | |
495 | frame = (SCM_BACKWARDS_P | |
496 | ? SCM_FRAME_PREV (frame) | |
497 | : SCM_FRAME_NEXT (frame)); | |
498 | } | |
499 | } | |
500 | ||
501 | /* Determine size of frame number field. */ | |
bdf8afff | 502 | j = SCM_FRAME_NUMBER (scm_stack_ref (a->stack, SCM_MAKINUM (end))); |
ab4f3efb MD |
503 | for (i = 0; j > 0; ++i) j /= 10; |
504 | nfield = i ? i : 1; | |
505 | ||
b7f3516f | 506 | scm_puts ("Backtrace:\n", a->port); |
ab4f3efb MD |
507 | |
508 | /* Print frames. */ | |
bdf8afff | 509 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb | 510 | indentation = 1; |
bdf8afff | 511 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb MD |
512 | for (i = 1; i < n; ++i) |
513 | { | |
514 | if (indent_p && SCM_FRAME_EVAL_ARGS_P (frame)) | |
515 | ++indentation; | |
516 | frame = SCM_BACKWARDS_P ? SCM_FRAME_PREV (frame) : SCM_FRAME_NEXT (frame); | |
bdf8afff | 517 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb | 518 | } |
bdf8afff MD |
519 | |
520 | return SCM_UNSPECIFIED; | |
521 | } | |
522 | ||
523 | SCM | |
524 | scm_display_backtrace (stack, port, first, depth) | |
525 | SCM stack; | |
526 | SCM port; | |
527 | SCM first; | |
528 | SCM depth; | |
529 | { | |
530 | struct display_backtrace_args a = { stack, port, first, depth }; | |
531 | struct display_error_handler_data data = { "backtrace", port }; | |
532 | scm_internal_catch (SCM_BOOL_T, | |
533 | (scm_catch_body_t) display_backtrace_body, &a, | |
534 | (scm_catch_handler_t) display_error_handler, &data); | |
ab4f3efb MD |
535 | return SCM_UNSPECIFIED; |
536 | } | |
537 | ||
78f9f47b | 538 | SCM_VCELL (scm_has_shown_backtrace_hint_p_var, "has-shown-backtrace-hint?"); |
5aab5d96 MD |
539 | |
540 | SCM_PROC(s_backtrace, "backtrace", 0, 0, 0, scm_backtrace); | |
541 | SCM | |
542 | scm_backtrace () | |
543 | { | |
b6609fc7 | 544 | SCM the_last_stack = scm_fluid_ref (SCM_CDR (scm_the_last_stack_fluid)); |
a5d6d578 | 545 | if (SCM_NFALSEP (the_last_stack)) |
5aab5d96 MD |
546 | { |
547 | scm_newline (scm_cur_outp); | |
a5d6d578 | 548 | scm_display_backtrace (the_last_stack, |
5aab5d96 MD |
549 | scm_cur_outp, |
550 | SCM_UNDEFINED, | |
551 | SCM_UNDEFINED); | |
552 | scm_newline (scm_cur_outp); | |
553 | if (SCM_FALSEP (SCM_CDR (scm_has_shown_backtrace_hint_p_var)) | |
554 | && !SCM_BACKTRACE_P) | |
555 | { | |
b7f3516f TT |
556 | scm_puts ("Type \"(debug-enable 'backtrace)\" if you would like " |
557 | "a backtrace\n" | |
558 | "automatically if an error occurs in the future.\n", | |
559 | scm_cur_outp); | |
5aab5d96 MD |
560 | SCM_SETCDR (scm_has_shown_backtrace_hint_p_var, SCM_BOOL_T); |
561 | } | |
562 | } | |
563 | else | |
564 | { | |
b7f3516f | 565 | scm_puts ("No backtrace available.\n", scm_cur_outp); |
5aab5d96 MD |
566 | } |
567 | return SCM_UNSPECIFIED; | |
568 | } | |
569 | ||
ab4f3efb MD |
570 | \f |
571 | ||
572 | void | |
573 | scm_init_backtrace () | |
574 | { | |
a5d6d578 | 575 | SCM f = scm_make_fluid (); |
b6609fc7 | 576 | scm_the_last_stack_fluid = scm_sysintern ("the-last-stack", f); |
5aab5d96 | 577 | |
ab4f3efb MD |
578 | #include "backtrace.x" |
579 | } |