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" |
ab4f3efb MD |
54 | |
55 | #include "backtrace.h" | |
56 | ||
57 | /* {Error reporting and backtraces} | |
58 | * (A first approximation.) | |
59 | * | |
60 | * Note that these functions shouldn't generate errors themselves. | |
61 | */ | |
62 | ||
63 | #ifndef SCM_RECKLESS | |
64 | #undef SCM_ASSERT | |
65 | #define SCM_ASSERT(_cond, _arg, _pos, _subr) \ | |
66 | if (!(_cond)) \ | |
67 | return SCM_BOOL_F; | |
68 | #endif | |
69 | ||
70 | static void display_header SCM_P ((SCM source, SCM port)); | |
71 | static void | |
72 | display_header (source, port) | |
73 | SCM source; | |
74 | SCM port; | |
75 | { | |
76 | SCM fname = (SCM_NIMP (source) && SCM_MEMOIZEDP (source) | |
77 | ? scm_source_property (source, scm_i_filename) | |
78 | : SCM_BOOL_F); | |
79 | if (SCM_NIMP (fname) && SCM_STRINGP (fname)) | |
80 | { | |
81 | scm_prin1 (fname, port, 0); | |
b7f3516f | 82 | scm_putc (':', port); |
ab4f3efb | 83 | scm_prin1 (scm_source_property (source, scm_i_line), port, 0); |
b7f3516f | 84 | scm_putc (':', port); |
ab4f3efb MD |
85 | scm_prin1 (scm_source_property (source, scm_i_column), port, 0); |
86 | } | |
87 | else | |
b7f3516f TT |
88 | scm_puts ("ERROR", port); |
89 | scm_puts (": ", port); | |
ab4f3efb MD |
90 | } |
91 | ||
f3acc5c1 JB |
92 | |
93 | void | |
94 | scm_display_error_message (message, args, port) | |
ab4f3efb MD |
95 | SCM message; |
96 | SCM args; | |
97 | SCM port; | |
98 | { | |
99 | int writingp; | |
100 | char *start; | |
101 | char *p; | |
102 | ||
89958ad0 | 103 | if (SCM_IMP (message) || !SCM_ROSTRINGP (message) || SCM_IMP (args) |
c37e0e55 | 104 | || !scm_list_p (args)) |
ab4f3efb MD |
105 | { |
106 | scm_prin1 (message, port, 0); | |
b7f3516f | 107 | scm_putc ('\n', port); |
ab4f3efb MD |
108 | return; |
109 | } | |
110 | ||
89958ad0 JB |
111 | SCM_COERCE_SUBSTR (message); |
112 | start = SCM_ROCHARS (message); | |
ab4f3efb MD |
113 | for (p = start; *p != '\0'; ++p) |
114 | if (*p == '%') | |
115 | { | |
116 | if (SCM_IMP (args) || SCM_NCONSP (args)) | |
117 | continue; | |
118 | ||
119 | ++p; | |
120 | if (*p == 's') | |
121 | writingp = 0; | |
122 | else if (*p == 'S') | |
123 | writingp = 1; | |
124 | else | |
125 | continue; | |
126 | ||
b7f3516f | 127 | scm_lfwrite (start, p - start - 1, port); |
ab4f3efb MD |
128 | scm_prin1 (SCM_CAR (args), port, writingp); |
129 | args = SCM_CDR (args); | |
130 | start = p + 1; | |
131 | } | |
b7f3516f TT |
132 | scm_lfwrite (start, p - start, port); |
133 | scm_putc ('\n', port); | |
ab4f3efb MD |
134 | } |
135 | ||
136 | static void display_expression SCM_P ((SCM frame, SCM pname, SCM source, SCM port)); | |
137 | static void | |
138 | display_expression (frame, pname, source, port) | |
139 | SCM frame; | |
140 | SCM pname; | |
141 | SCM source; | |
142 | SCM port; | |
143 | { | |
144 | SCM print_state = scm_make_print_state (); | |
145 | scm_print_state *pstate = SCM_PRINT_STATE (print_state); | |
146 | pstate->writingp = 0; | |
147 | pstate->fancyp = 1; | |
148 | pstate->level = 2; | |
149 | pstate->length = 3; | |
150 | if (SCM_NIMP (pname) && SCM_ROSTRINGP (pname)) | |
151 | { | |
152 | if (SCM_NIMP (frame) | |
153 | && SCM_FRAMEP (frame) | |
154 | && SCM_FRAME_EVAL_ARGS_P (frame)) | |
b7f3516f | 155 | scm_puts ("While evaluating arguments to ", port); |
ab4f3efb | 156 | else |
b7f3516f | 157 | scm_puts ("In procedure ", port); |
ab4f3efb MD |
158 | scm_iprin1 (pname, port, pstate); |
159 | if (SCM_NIMP (source) && SCM_MEMOIZEDP (source)) | |
160 | { | |
b7f3516f | 161 | scm_puts (" in expression ", port); |
ab4f3efb MD |
162 | pstate->writingp = 1; |
163 | scm_iprin1 (scm_unmemoize (source), port, pstate); | |
164 | } | |
165 | } | |
166 | else if (SCM_NIMP (source)) | |
167 | { | |
b7f3516f | 168 | scm_puts ("In expression ", port); |
ab4f3efb MD |
169 | pstate->writingp = 1; |
170 | scm_iprin1 (scm_unmemoize (source), port, pstate); | |
171 | } | |
b7f3516f | 172 | scm_puts (":\n", port); |
ab4f3efb MD |
173 | scm_free_print_state (print_state); |
174 | } | |
175 | ||
bdf8afff MD |
176 | struct display_error_args { |
177 | SCM stack; | |
178 | SCM port; | |
179 | SCM subr; | |
180 | SCM message; | |
181 | SCM args; | |
182 | SCM rest; | |
183 | }; | |
184 | ||
185 | static SCM | |
186 | display_error_body (struct display_error_args *a, SCM jmpbuf) | |
ab4f3efb MD |
187 | { |
188 | SCM current_frame = SCM_BOOL_F; | |
189 | SCM source = SCM_BOOL_F; | |
190 | SCM pname = SCM_BOOL_F; | |
841076ac | 191 | if (SCM_DEBUGGINGP |
bdf8afff MD |
192 | && SCM_NIMP (a->stack) |
193 | && SCM_STACKP (a->stack) | |
194 | && SCM_STACK_LENGTH (a->stack) > 0) | |
ab4f3efb | 195 | { |
bdf8afff | 196 | current_frame = scm_stack_ref (a->stack, SCM_INUM0); |
ab4f3efb MD |
197 | source = SCM_FRAME_SOURCE (current_frame); |
198 | if (!(SCM_NIMP (source) && SCM_MEMOIZEDP (source))) | |
199 | source = SCM_FRAME_SOURCE (SCM_FRAME_PREV (current_frame)); | |
200 | if (SCM_FRAME_PROC_P (current_frame) | |
016e2ce1 | 201 | && scm_procedure_p (SCM_FRAME_PROC (current_frame)) == SCM_BOOL_T) |
ab4f3efb MD |
202 | pname = scm_procedure_name (SCM_FRAME_PROC (current_frame)); |
203 | } | |
204 | if (!(SCM_NIMP (pname) && SCM_ROSTRINGP (pname))) | |
bdf8afff | 205 | pname = a->subr; |
ab4f3efb MD |
206 | if ((SCM_NIMP (source) && SCM_MEMOIZEDP (source)) |
207 | || (SCM_NIMP (pname) && SCM_ROSTRINGP (pname))) | |
208 | { | |
bdf8afff MD |
209 | display_header (source, a->port); |
210 | display_expression (current_frame, pname, source, a->port); | |
ab4f3efb | 211 | } |
bdf8afff MD |
212 | display_header (source, a->port); |
213 | scm_display_error_message (a->message, a->args, a->port); | |
214 | return SCM_UNSPECIFIED; | |
215 | } | |
216 | ||
217 | struct display_error_handler_data { | |
218 | char *mode; | |
219 | SCM port; | |
220 | }; | |
221 | ||
222 | /* This is the exception handler for error reporting routines. | |
223 | Note that it is very important that this handler *doesn't* try to | |
224 | print more than the error tag, since the error very probably is | |
225 | caused by an erroneous print call-back routine. If we would | |
226 | tru to print all objects, we would enter an infinite loop. */ | |
227 | static SCM | |
228 | display_error_handler (struct display_error_handler_data *data, | |
229 | SCM tag, SCM args) | |
230 | { | |
231 | SCM print_state = scm_make_print_state (); | |
b7f3516f TT |
232 | scm_puts ("\nException during displaying of ", data->port); |
233 | scm_puts (data->mode, data->port); | |
234 | scm_puts (": ", data->port); | |
bdf8afff | 235 | scm_iprin1 (tag, data->port, SCM_PRINT_STATE (print_state)); |
b7f3516f | 236 | scm_putc ('\n', data->port); |
bdf8afff MD |
237 | return SCM_UNSPECIFIED; |
238 | } | |
239 | ||
240 | SCM_PROC(s_display_error, "display-error", 6, 0, 0, scm_display_error); | |
241 | SCM | |
242 | scm_display_error (stack, port, subr, message, args, rest) | |
243 | SCM stack; | |
244 | SCM port; | |
245 | SCM subr; | |
246 | SCM message; | |
247 | SCM args; | |
248 | SCM rest; | |
249 | { | |
250 | struct display_error_args a = { stack, port, subr, message, args, rest }; | |
251 | struct display_error_handler_data data = { "error", port }; | |
252 | scm_internal_catch (SCM_BOOL_T, | |
253 | (scm_catch_body_t) display_error_body, &a, | |
254 | (scm_catch_handler_t) display_error_handler, &data); | |
ab4f3efb MD |
255 | return SCM_UNSPECIFIED; |
256 | } | |
257 | ||
258 | static void indent SCM_P ((int n, SCM port)); | |
259 | static void | |
260 | indent (n, port) | |
261 | int n; | |
262 | SCM port; | |
263 | { | |
264 | int i; | |
265 | for (i = 0; i < n; ++i) | |
b7f3516f | 266 | scm_putc (' ', port); |
ab4f3efb MD |
267 | } |
268 | ||
269 | static void display_frame_expr SCM_P ((char *hdr, SCM exp, char *tlr, int indentation, SCM sport, SCM port, scm_print_state *pstate)); | |
270 | static void | |
271 | display_frame_expr (hdr, exp, tlr, indentation, sport, port, pstate) | |
272 | char *hdr; | |
273 | SCM exp; | |
274 | char *tlr; | |
275 | int indentation; | |
276 | SCM sport; | |
277 | SCM port; | |
278 | scm_print_state *pstate; | |
279 | { | |
ab4f3efb MD |
280 | if (SCM_NIMP (exp) && SCM_CONSP (exp)) |
281 | { | |
282 | scm_iprlist (hdr, exp, tlr[0], port, pstate); | |
b7f3516f | 283 | scm_puts (&tlr[1], port); |
ab4f3efb MD |
284 | } |
285 | else | |
286 | scm_iprin1 (exp, port, pstate); | |
b7f3516f | 287 | scm_putc ('\n', port); |
ab4f3efb MD |
288 | } |
289 | ||
e3c37929 MD |
290 | static void display_application SCM_P ((SCM frame, int indentation, SCM sport, SCM port, scm_print_state *pstate)); |
291 | static void | |
292 | display_application (frame, indentation, sport, port, pstate) | |
293 | SCM frame; | |
294 | int indentation; | |
295 | SCM sport; | |
296 | SCM port; | |
297 | scm_print_state *pstate; | |
298 | { | |
299 | SCM proc = SCM_FRAME_PROC (frame); | |
300 | SCM name = (SCM_NFALSEP (scm_procedure_p (proc)) | |
301 | ? scm_procedure_name (proc) | |
302 | : SCM_BOOL_F); | |
303 | display_frame_expr ("[", | |
304 | scm_cons (SCM_NFALSEP (name) ? name : proc, | |
305 | SCM_FRAME_ARGS (frame)), | |
306 | SCM_FRAME_EVAL_ARGS_P (frame) ? " ..." : "]", | |
307 | indentation, | |
308 | sport, | |
309 | port, | |
310 | pstate); | |
311 | } | |
312 | ||
313 | SCM_PROC(s_display_application, "display-application", 1, 1, 0, scm_display_application); | |
314 | ||
315 | SCM | |
316 | scm_display_application (SCM frame, SCM port) | |
317 | { | |
318 | if (SCM_UNBNDP (port)) | |
319 | port = scm_cur_outp; | |
320 | if (SCM_FRAME_PROC_P (frame)) | |
321 | /* Display an application. */ | |
322 | { | |
323 | SCM print_state; | |
324 | scm_print_state *pstate; | |
325 | ||
326 | /* Create a print state for printing of frames. */ | |
327 | print_state = scm_make_print_state (); | |
328 | pstate = SCM_PRINT_STATE (print_state); | |
329 | pstate->writingp = 1; | |
330 | pstate->fancyp = 1; | |
331 | pstate->level = 2; | |
332 | pstate->length = 9; | |
333 | ||
334 | display_application (frame, 0, SCM_BOOL_F, port, pstate); /*fixme*/ | |
335 | return SCM_BOOL_T; | |
336 | } | |
337 | else | |
338 | return SCM_BOOL_F; | |
339 | } | |
340 | ||
ab4f3efb MD |
341 | static void display_frame SCM_P ((SCM frame, int nfield, int indentation, SCM sport, SCM port, scm_print_state *pstate)); |
342 | static void | |
343 | display_frame (frame, nfield, indentation, sport, port, pstate) | |
344 | SCM frame; | |
345 | int nfield; | |
346 | int indentation; | |
347 | SCM sport; | |
348 | SCM port; | |
349 | scm_print_state *pstate; | |
350 | { | |
351 | int n, i, j; | |
352 | ||
353 | /* Announce missing frames? */ | |
354 | if (!SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
355 | { | |
356 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 357 | scm_puts ("...\n", port); |
ab4f3efb MD |
358 | } |
359 | ||
360 | /* Check size of frame number. */ | |
361 | n = SCM_FRAME_NUMBER (frame); | |
362 | for (i = 0, j = n; j > 0; ++i) j /= 10; | |
363 | ||
364 | /* Number indentation. */ | |
365 | indent (nfield - (i ? i : 1), port); | |
366 | ||
367 | /* Frame number. */ | |
368 | scm_iprin1 (SCM_MAKINUM (n), port, pstate); | |
369 | ||
370 | /* Real frame marker */ | |
b7f3516f | 371 | scm_putc (SCM_FRAME_REAL_P (frame) ? '*' : ' ', port); |
ab4f3efb MD |
372 | |
373 | /* Indentation. */ | |
374 | indent (indentation, port); | |
375 | ||
376 | if (SCM_FRAME_PROC_P (frame)) | |
377 | /* Display an application. */ | |
e3c37929 | 378 | display_application (frame, nfield + 1 + indentation, sport, port, pstate); |
ab4f3efb MD |
379 | else |
380 | /* Display a special form. */ | |
381 | { | |
382 | SCM source = SCM_FRAME_SOURCE (frame); | |
383 | SCM copy = scm_source_property (source, scm_i_copy); | |
384 | display_frame_expr ("(", | |
385 | SCM_NIMP (copy) && SCM_CONSP (copy) | |
386 | ? copy | |
387 | : scm_unmemoize (source), | |
388 | ")", | |
389 | nfield + 1 + indentation, | |
390 | sport, | |
391 | port, | |
392 | pstate); | |
393 | } | |
394 | ||
395 | /* Announce missing frames? */ | |
396 | if (SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
397 | { | |
398 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 399 | scm_puts ("...\n", port); |
ab4f3efb MD |
400 | } |
401 | } | |
402 | ||
bdf8afff MD |
403 | struct display_backtrace_args { |
404 | SCM stack; | |
405 | SCM port; | |
406 | SCM first; | |
407 | SCM depth; | |
408 | }; | |
409 | ||
ab4f3efb | 410 | SCM_PROC(s_display_backtrace, "display-backtrace", 2, 2, 0, scm_display_backtrace); |
bdf8afff MD |
411 | |
412 | static SCM | |
413 | display_backtrace_body (struct display_backtrace_args *a, SCM jmpbuf) | |
ab4f3efb MD |
414 | { |
415 | int n_frames, beg, end, n, i, j; | |
416 | int nfield, indent_p, indentation; | |
417 | SCM frame, sport, print_state; | |
418 | scm_print_state *pstate; | |
419 | ||
78446828 MV |
420 | a->port = SCM_COERCE_OUTPORT (a->port); |
421 | ||
ab4f3efb | 422 | /* Argument checking and extraction. */ |
bdf8afff MD |
423 | SCM_ASSERT (SCM_NIMP (a->stack) && SCM_STACKP (a->stack), |
424 | a->stack, | |
ab4f3efb MD |
425 | SCM_ARG1, |
426 | s_display_backtrace); | |
bdf8afff MD |
427 | SCM_ASSERT (SCM_NIMP (a->port) && SCM_OPOUTPORTP (a->port), |
428 | a->port, | |
ab4f3efb MD |
429 | SCM_ARG2, |
430 | s_display_backtrace); | |
bdf8afff MD |
431 | n_frames = SCM_INUM (scm_stack_length (a->stack)); |
432 | n = SCM_INUMP (a->depth) ? SCM_INUM (a->depth) : SCM_BACKTRACE_DEPTH; | |
ab4f3efb MD |
433 | if (SCM_BACKWARDS_P) |
434 | { | |
bdf8afff | 435 | beg = SCM_INUMP (a->first) ? SCM_INUM (a->first) : 0; |
ab4f3efb MD |
436 | end = beg + n - 1; |
437 | if (end >= n_frames) | |
438 | end = n_frames - 1; | |
439 | n = end - beg + 1; | |
440 | } | |
441 | else | |
442 | { | |
bdf8afff | 443 | if (SCM_INUMP (a->first)) |
ab4f3efb | 444 | { |
bdf8afff | 445 | beg = SCM_INUM (a->first); |
ab4f3efb MD |
446 | end = beg - n + 1; |
447 | if (end < 0) | |
448 | end = 0; | |
449 | } | |
450 | else | |
451 | { | |
452 | beg = n - 1; | |
453 | end = 0; | |
454 | if (beg >= n_frames) | |
455 | beg = n_frames - 1; | |
456 | } | |
457 | n = beg - end + 1; | |
458 | } | |
bdf8afff MD |
459 | SCM_ASSERT (beg >= 0 && beg < n_frames, a->first, SCM_ARG3, s_display_backtrace); |
460 | SCM_ASSERT (n > 0, a->depth, SCM_ARG4, s_display_backtrace); | |
ab4f3efb MD |
461 | |
462 | /* Create a string port used for adaptation of printing parameters. */ | |
463 | sport = scm_mkstrport (SCM_INUM0, | |
464 | scm_make_string (SCM_MAKINUM (240), SCM_UNDEFINED), | |
465 | SCM_OPN | SCM_WRTNG, | |
466 | s_display_backtrace); | |
467 | ||
468 | /* Create a print state for printing of frames. */ | |
469 | print_state = scm_make_print_state (); | |
470 | pstate = SCM_PRINT_STATE (print_state); | |
471 | pstate->writingp = 1; | |
472 | pstate->fancyp = 1; | |
e3c37929 MD |
473 | pstate->level = 2; |
474 | pstate->length = 3; | |
ab4f3efb MD |
475 | |
476 | /* First find out if it's reasonable to do indentation. */ | |
477 | if (SCM_BACKWARDS_P) | |
478 | indent_p = 0; | |
479 | else | |
480 | { | |
481 | indent_p = 1; | |
bdf8afff | 482 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb MD |
483 | for (i = 0, j = 0; i < n; ++i) |
484 | { | |
485 | if (SCM_FRAME_REAL_P (frame)) | |
486 | ++j; | |
487 | if (j > SCM_BACKTRACE_INDENT) | |
488 | { | |
489 | indent_p = 0; | |
490 | break; | |
491 | } | |
492 | frame = (SCM_BACKWARDS_P | |
493 | ? SCM_FRAME_PREV (frame) | |
494 | : SCM_FRAME_NEXT (frame)); | |
495 | } | |
496 | } | |
497 | ||
498 | /* Determine size of frame number field. */ | |
bdf8afff | 499 | j = SCM_FRAME_NUMBER (scm_stack_ref (a->stack, SCM_MAKINUM (end))); |
ab4f3efb MD |
500 | for (i = 0; j > 0; ++i) j /= 10; |
501 | nfield = i ? i : 1; | |
502 | ||
b7f3516f | 503 | scm_puts ("Backtrace:\n", a->port); |
ab4f3efb MD |
504 | |
505 | /* Print frames. */ | |
bdf8afff | 506 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb | 507 | indentation = 1; |
bdf8afff | 508 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb MD |
509 | for (i = 1; i < n; ++i) |
510 | { | |
511 | if (indent_p && SCM_FRAME_EVAL_ARGS_P (frame)) | |
512 | ++indentation; | |
513 | frame = SCM_BACKWARDS_P ? SCM_FRAME_PREV (frame) : SCM_FRAME_NEXT (frame); | |
bdf8afff | 514 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb | 515 | } |
bdf8afff MD |
516 | |
517 | return SCM_UNSPECIFIED; | |
518 | } | |
519 | ||
520 | SCM | |
521 | scm_display_backtrace (stack, port, first, depth) | |
522 | SCM stack; | |
523 | SCM port; | |
524 | SCM first; | |
525 | SCM depth; | |
526 | { | |
527 | struct display_backtrace_args a = { stack, port, first, depth }; | |
528 | struct display_error_handler_data data = { "backtrace", port }; | |
529 | scm_internal_catch (SCM_BOOL_T, | |
530 | (scm_catch_body_t) display_backtrace_body, &a, | |
531 | (scm_catch_handler_t) display_error_handler, &data); | |
ab4f3efb MD |
532 | return SCM_UNSPECIFIED; |
533 | } | |
534 | ||
78f9f47b | 535 | SCM_VCELL (scm_has_shown_backtrace_hint_p_var, "has-shown-backtrace-hint?"); |
5aab5d96 MD |
536 | |
537 | SCM_PROC(s_backtrace, "backtrace", 0, 0, 0, scm_backtrace); | |
538 | SCM | |
539 | scm_backtrace () | |
540 | { | |
541 | if (SCM_NFALSEP (SCM_CDR (scm_the_last_stack_var))) | |
542 | { | |
543 | scm_newline (scm_cur_outp); | |
544 | scm_display_backtrace (SCM_CDR (scm_the_last_stack_var), | |
545 | scm_cur_outp, | |
546 | SCM_UNDEFINED, | |
547 | SCM_UNDEFINED); | |
548 | scm_newline (scm_cur_outp); | |
549 | if (SCM_FALSEP (SCM_CDR (scm_has_shown_backtrace_hint_p_var)) | |
550 | && !SCM_BACKTRACE_P) | |
551 | { | |
b7f3516f TT |
552 | scm_puts ("Type \"(debug-enable 'backtrace)\" if you would like " |
553 | "a backtrace\n" | |
554 | "automatically if an error occurs in the future.\n", | |
555 | scm_cur_outp); | |
5aab5d96 MD |
556 | SCM_SETCDR (scm_has_shown_backtrace_hint_p_var, SCM_BOOL_T); |
557 | } | |
558 | } | |
559 | else | |
560 | { | |
b7f3516f | 561 | scm_puts ("No backtrace available.\n", scm_cur_outp); |
5aab5d96 MD |
562 | } |
563 | return SCM_UNSPECIFIED; | |
564 | } | |
565 | ||
ab4f3efb MD |
566 | \f |
567 | ||
568 | void | |
569 | scm_init_backtrace () | |
570 | { | |
5aab5d96 MD |
571 | scm_the_last_stack_var = scm_sysintern ("the-last-stack", SCM_BOOL_F); |
572 | ||
ab4f3efb MD |
573 | #include "backtrace.x" |
574 | } |