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 | ||
71 | static void display_header SCM_P ((SCM source, SCM port)); | |
72 | static void | |
73 | display_header (source, port) | |
74 | SCM source; | |
75 | SCM port; | |
76 | { | |
77 | SCM fname = (SCM_NIMP (source) && SCM_MEMOIZEDP (source) | |
78 | ? scm_source_property (source, scm_i_filename) | |
79 | : SCM_BOOL_F); | |
80 | if (SCM_NIMP (fname) && SCM_STRINGP (fname)) | |
81 | { | |
82 | scm_prin1 (fname, port, 0); | |
b7f3516f | 83 | scm_putc (':', port); |
ab4f3efb | 84 | scm_prin1 (scm_source_property (source, scm_i_line), port, 0); |
b7f3516f | 85 | scm_putc (':', port); |
ab4f3efb MD |
86 | scm_prin1 (scm_source_property (source, scm_i_column), port, 0); |
87 | } | |
88 | else | |
b7f3516f TT |
89 | scm_puts ("ERROR", port); |
90 | scm_puts (": ", port); | |
ab4f3efb MD |
91 | } |
92 | ||
f3acc5c1 JB |
93 | |
94 | void | |
95 | scm_display_error_message (message, args, port) | |
ab4f3efb MD |
96 | SCM message; |
97 | SCM args; | |
98 | SCM port; | |
99 | { | |
100 | int writingp; | |
101 | char *start; | |
102 | char *p; | |
103 | ||
89958ad0 | 104 | if (SCM_IMP (message) || !SCM_ROSTRINGP (message) || SCM_IMP (args) |
c37e0e55 | 105 | || !scm_list_p (args)) |
ab4f3efb MD |
106 | { |
107 | scm_prin1 (message, port, 0); | |
b7f3516f | 108 | scm_putc ('\n', port); |
ab4f3efb MD |
109 | return; |
110 | } | |
111 | ||
89958ad0 JB |
112 | SCM_COERCE_SUBSTR (message); |
113 | start = SCM_ROCHARS (message); | |
ab4f3efb MD |
114 | for (p = start; *p != '\0'; ++p) |
115 | if (*p == '%') | |
116 | { | |
117 | if (SCM_IMP (args) || SCM_NCONSP (args)) | |
118 | continue; | |
119 | ||
120 | ++p; | |
121 | if (*p == 's') | |
122 | writingp = 0; | |
123 | else if (*p == 'S') | |
124 | writingp = 1; | |
125 | else | |
126 | continue; | |
127 | ||
b7f3516f | 128 | scm_lfwrite (start, p - start - 1, port); |
ab4f3efb MD |
129 | scm_prin1 (SCM_CAR (args), port, writingp); |
130 | args = SCM_CDR (args); | |
131 | start = p + 1; | |
132 | } | |
b7f3516f TT |
133 | scm_lfwrite (start, p - start, port); |
134 | scm_putc ('\n', port); | |
ab4f3efb MD |
135 | } |
136 | ||
137 | static void display_expression SCM_P ((SCM frame, SCM pname, SCM source, SCM port)); | |
138 | static void | |
139 | display_expression (frame, pname, source, port) | |
140 | SCM frame; | |
141 | SCM pname; | |
142 | SCM source; | |
143 | SCM port; | |
144 | { | |
145 | SCM print_state = scm_make_print_state (); | |
146 | scm_print_state *pstate = SCM_PRINT_STATE (print_state); | |
147 | pstate->writingp = 0; | |
148 | pstate->fancyp = 1; | |
149 | pstate->level = 2; | |
150 | pstate->length = 3; | |
151 | if (SCM_NIMP (pname) && SCM_ROSTRINGP (pname)) | |
152 | { | |
153 | if (SCM_NIMP (frame) | |
154 | && SCM_FRAMEP (frame) | |
155 | && SCM_FRAME_EVAL_ARGS_P (frame)) | |
b7f3516f | 156 | scm_puts ("While evaluating arguments to ", port); |
ab4f3efb | 157 | else |
b7f3516f | 158 | scm_puts ("In procedure ", port); |
ab4f3efb MD |
159 | scm_iprin1 (pname, port, pstate); |
160 | if (SCM_NIMP (source) && SCM_MEMOIZEDP (source)) | |
161 | { | |
b7f3516f | 162 | scm_puts (" in expression ", port); |
ab4f3efb MD |
163 | pstate->writingp = 1; |
164 | scm_iprin1 (scm_unmemoize (source), port, pstate); | |
165 | } | |
166 | } | |
167 | else if (SCM_NIMP (source)) | |
168 | { | |
b7f3516f | 169 | scm_puts ("In expression ", port); |
ab4f3efb MD |
170 | pstate->writingp = 1; |
171 | scm_iprin1 (scm_unmemoize (source), port, pstate); | |
172 | } | |
b7f3516f | 173 | scm_puts (":\n", port); |
ab4f3efb MD |
174 | scm_free_print_state (print_state); |
175 | } | |
176 | ||
bdf8afff MD |
177 | struct display_error_args { |
178 | SCM stack; | |
179 | SCM port; | |
180 | SCM subr; | |
181 | SCM message; | |
182 | SCM args; | |
183 | SCM rest; | |
184 | }; | |
185 | ||
186 | static SCM | |
187 | display_error_body (struct display_error_args *a, SCM jmpbuf) | |
ab4f3efb MD |
188 | { |
189 | SCM current_frame = SCM_BOOL_F; | |
190 | SCM source = SCM_BOOL_F; | |
191 | SCM pname = SCM_BOOL_F; | |
841076ac | 192 | if (SCM_DEBUGGINGP |
bdf8afff MD |
193 | && SCM_NIMP (a->stack) |
194 | && SCM_STACKP (a->stack) | |
195 | && SCM_STACK_LENGTH (a->stack) > 0) | |
ab4f3efb | 196 | { |
bdf8afff | 197 | current_frame = scm_stack_ref (a->stack, SCM_INUM0); |
ab4f3efb MD |
198 | source = SCM_FRAME_SOURCE (current_frame); |
199 | if (!(SCM_NIMP (source) && SCM_MEMOIZEDP (source))) | |
200 | source = SCM_FRAME_SOURCE (SCM_FRAME_PREV (current_frame)); | |
201 | if (SCM_FRAME_PROC_P (current_frame) | |
016e2ce1 | 202 | && scm_procedure_p (SCM_FRAME_PROC (current_frame)) == SCM_BOOL_T) |
ab4f3efb MD |
203 | pname = scm_procedure_name (SCM_FRAME_PROC (current_frame)); |
204 | } | |
205 | if (!(SCM_NIMP (pname) && SCM_ROSTRINGP (pname))) | |
bdf8afff | 206 | pname = a->subr; |
ab4f3efb MD |
207 | if ((SCM_NIMP (source) && SCM_MEMOIZEDP (source)) |
208 | || (SCM_NIMP (pname) && SCM_ROSTRINGP (pname))) | |
209 | { | |
bdf8afff MD |
210 | display_header (source, a->port); |
211 | display_expression (current_frame, pname, source, a->port); | |
ab4f3efb | 212 | } |
bdf8afff MD |
213 | display_header (source, a->port); |
214 | scm_display_error_message (a->message, a->args, a->port); | |
215 | return SCM_UNSPECIFIED; | |
216 | } | |
217 | ||
218 | struct display_error_handler_data { | |
219 | char *mode; | |
220 | SCM port; | |
221 | }; | |
222 | ||
223 | /* This is the exception handler for error reporting routines. | |
224 | Note that it is very important that this handler *doesn't* try to | |
225 | print more than the error tag, since the error very probably is | |
226 | caused by an erroneous print call-back routine. If we would | |
227 | tru to print all objects, we would enter an infinite loop. */ | |
228 | static SCM | |
229 | display_error_handler (struct display_error_handler_data *data, | |
230 | SCM tag, SCM args) | |
231 | { | |
232 | SCM print_state = scm_make_print_state (); | |
b7f3516f TT |
233 | scm_puts ("\nException during displaying of ", data->port); |
234 | scm_puts (data->mode, data->port); | |
235 | scm_puts (": ", data->port); | |
bdf8afff | 236 | scm_iprin1 (tag, data->port, SCM_PRINT_STATE (print_state)); |
b7f3516f | 237 | scm_putc ('\n', data->port); |
bdf8afff MD |
238 | return SCM_UNSPECIFIED; |
239 | } | |
240 | ||
241 | SCM_PROC(s_display_error, "display-error", 6, 0, 0, scm_display_error); | |
242 | SCM | |
243 | scm_display_error (stack, port, subr, message, args, rest) | |
244 | SCM stack; | |
245 | SCM port; | |
246 | SCM subr; | |
247 | SCM message; | |
248 | SCM args; | |
249 | SCM rest; | |
250 | { | |
251 | struct display_error_args a = { stack, port, subr, message, args, rest }; | |
252 | struct display_error_handler_data data = { "error", port }; | |
253 | scm_internal_catch (SCM_BOOL_T, | |
254 | (scm_catch_body_t) display_error_body, &a, | |
255 | (scm_catch_handler_t) display_error_handler, &data); | |
ab4f3efb MD |
256 | return SCM_UNSPECIFIED; |
257 | } | |
258 | ||
259 | static void indent SCM_P ((int n, SCM port)); | |
260 | static void | |
261 | indent (n, port) | |
262 | int n; | |
263 | SCM port; | |
264 | { | |
265 | int i; | |
266 | for (i = 0; i < n; ++i) | |
b7f3516f | 267 | scm_putc (' ', port); |
ab4f3efb MD |
268 | } |
269 | ||
270 | static void display_frame_expr SCM_P ((char *hdr, SCM exp, char *tlr, int indentation, SCM sport, SCM port, scm_print_state *pstate)); | |
271 | static void | |
272 | display_frame_expr (hdr, exp, tlr, indentation, sport, port, pstate) | |
273 | char *hdr; | |
274 | SCM exp; | |
275 | char *tlr; | |
276 | int indentation; | |
277 | SCM sport; | |
278 | SCM port; | |
279 | scm_print_state *pstate; | |
280 | { | |
ab4f3efb MD |
281 | if (SCM_NIMP (exp) && SCM_CONSP (exp)) |
282 | { | |
283 | scm_iprlist (hdr, exp, tlr[0], port, pstate); | |
b7f3516f | 284 | scm_puts (&tlr[1], port); |
ab4f3efb MD |
285 | } |
286 | else | |
287 | scm_iprin1 (exp, port, pstate); | |
b7f3516f | 288 | scm_putc ('\n', port); |
ab4f3efb MD |
289 | } |
290 | ||
e3c37929 MD |
291 | static void display_application SCM_P ((SCM frame, int indentation, SCM sport, SCM port, scm_print_state *pstate)); |
292 | static void | |
293 | display_application (frame, indentation, sport, port, pstate) | |
294 | SCM frame; | |
295 | int indentation; | |
296 | SCM sport; | |
297 | SCM port; | |
298 | scm_print_state *pstate; | |
299 | { | |
300 | SCM proc = SCM_FRAME_PROC (frame); | |
301 | SCM name = (SCM_NFALSEP (scm_procedure_p (proc)) | |
302 | ? scm_procedure_name (proc) | |
303 | : SCM_BOOL_F); | |
304 | display_frame_expr ("[", | |
305 | scm_cons (SCM_NFALSEP (name) ? name : proc, | |
306 | SCM_FRAME_ARGS (frame)), | |
307 | SCM_FRAME_EVAL_ARGS_P (frame) ? " ..." : "]", | |
308 | indentation, | |
309 | sport, | |
310 | port, | |
311 | pstate); | |
312 | } | |
313 | ||
314 | SCM_PROC(s_display_application, "display-application", 1, 1, 0, scm_display_application); | |
315 | ||
316 | SCM | |
317 | scm_display_application (SCM frame, SCM port) | |
318 | { | |
319 | if (SCM_UNBNDP (port)) | |
320 | port = scm_cur_outp; | |
321 | if (SCM_FRAME_PROC_P (frame)) | |
322 | /* Display an application. */ | |
323 | { | |
324 | SCM print_state; | |
325 | scm_print_state *pstate; | |
326 | ||
327 | /* Create a print state for printing of frames. */ | |
328 | print_state = scm_make_print_state (); | |
329 | pstate = SCM_PRINT_STATE (print_state); | |
330 | pstate->writingp = 1; | |
331 | pstate->fancyp = 1; | |
332 | pstate->level = 2; | |
333 | pstate->length = 9; | |
334 | ||
335 | display_application (frame, 0, SCM_BOOL_F, port, pstate); /*fixme*/ | |
336 | return SCM_BOOL_T; | |
337 | } | |
338 | else | |
339 | return SCM_BOOL_F; | |
340 | } | |
341 | ||
ab4f3efb MD |
342 | static void display_frame SCM_P ((SCM frame, int nfield, int indentation, SCM sport, SCM port, scm_print_state *pstate)); |
343 | static void | |
344 | display_frame (frame, nfield, indentation, sport, port, pstate) | |
345 | SCM frame; | |
346 | int nfield; | |
347 | int indentation; | |
348 | SCM sport; | |
349 | SCM port; | |
350 | scm_print_state *pstate; | |
351 | { | |
352 | int n, i, j; | |
353 | ||
354 | /* Announce missing frames? */ | |
355 | if (!SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
356 | { | |
357 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 358 | scm_puts ("...\n", port); |
ab4f3efb MD |
359 | } |
360 | ||
361 | /* Check size of frame number. */ | |
362 | n = SCM_FRAME_NUMBER (frame); | |
363 | for (i = 0, j = n; j > 0; ++i) j /= 10; | |
364 | ||
365 | /* Number indentation. */ | |
366 | indent (nfield - (i ? i : 1), port); | |
367 | ||
368 | /* Frame number. */ | |
369 | scm_iprin1 (SCM_MAKINUM (n), port, pstate); | |
370 | ||
371 | /* Real frame marker */ | |
b7f3516f | 372 | scm_putc (SCM_FRAME_REAL_P (frame) ? '*' : ' ', port); |
ab4f3efb MD |
373 | |
374 | /* Indentation. */ | |
375 | indent (indentation, port); | |
376 | ||
377 | if (SCM_FRAME_PROC_P (frame)) | |
378 | /* Display an application. */ | |
e3c37929 | 379 | display_application (frame, nfield + 1 + indentation, sport, port, pstate); |
ab4f3efb MD |
380 | else |
381 | /* Display a special form. */ | |
382 | { | |
383 | SCM source = SCM_FRAME_SOURCE (frame); | |
384 | SCM copy = scm_source_property (source, scm_i_copy); | |
385 | display_frame_expr ("(", | |
386 | SCM_NIMP (copy) && SCM_CONSP (copy) | |
387 | ? copy | |
388 | : scm_unmemoize (source), | |
389 | ")", | |
390 | nfield + 1 + indentation, | |
391 | sport, | |
392 | port, | |
393 | pstate); | |
394 | } | |
395 | ||
396 | /* Announce missing frames? */ | |
397 | if (SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
398 | { | |
399 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 400 | scm_puts ("...\n", port); |
ab4f3efb MD |
401 | } |
402 | } | |
403 | ||
bdf8afff MD |
404 | struct display_backtrace_args { |
405 | SCM stack; | |
406 | SCM port; | |
407 | SCM first; | |
408 | SCM depth; | |
409 | }; | |
410 | ||
ab4f3efb | 411 | SCM_PROC(s_display_backtrace, "display-backtrace", 2, 2, 0, scm_display_backtrace); |
bdf8afff MD |
412 | |
413 | static SCM | |
414 | display_backtrace_body (struct display_backtrace_args *a, SCM jmpbuf) | |
ab4f3efb MD |
415 | { |
416 | int n_frames, beg, end, n, i, j; | |
417 | int nfield, indent_p, indentation; | |
418 | SCM frame, sport, print_state; | |
419 | scm_print_state *pstate; | |
420 | ||
78446828 MV |
421 | a->port = SCM_COERCE_OUTPORT (a->port); |
422 | ||
ab4f3efb | 423 | /* Argument checking and extraction. */ |
bdf8afff MD |
424 | SCM_ASSERT (SCM_NIMP (a->stack) && SCM_STACKP (a->stack), |
425 | a->stack, | |
ab4f3efb MD |
426 | SCM_ARG1, |
427 | s_display_backtrace); | |
bdf8afff MD |
428 | SCM_ASSERT (SCM_NIMP (a->port) && SCM_OPOUTPORTP (a->port), |
429 | a->port, | |
ab4f3efb MD |
430 | SCM_ARG2, |
431 | s_display_backtrace); | |
bdf8afff MD |
432 | n_frames = SCM_INUM (scm_stack_length (a->stack)); |
433 | n = SCM_INUMP (a->depth) ? SCM_INUM (a->depth) : SCM_BACKTRACE_DEPTH; | |
ab4f3efb MD |
434 | if (SCM_BACKWARDS_P) |
435 | { | |
bdf8afff | 436 | beg = SCM_INUMP (a->first) ? SCM_INUM (a->first) : 0; |
ab4f3efb MD |
437 | end = beg + n - 1; |
438 | if (end >= n_frames) | |
439 | end = n_frames - 1; | |
440 | n = end - beg + 1; | |
441 | } | |
442 | else | |
443 | { | |
bdf8afff | 444 | if (SCM_INUMP (a->first)) |
ab4f3efb | 445 | { |
bdf8afff | 446 | beg = SCM_INUM (a->first); |
ab4f3efb MD |
447 | end = beg - n + 1; |
448 | if (end < 0) | |
449 | end = 0; | |
450 | } | |
451 | else | |
452 | { | |
453 | beg = n - 1; | |
454 | end = 0; | |
455 | if (beg >= n_frames) | |
456 | beg = n_frames - 1; | |
457 | } | |
458 | n = beg - end + 1; | |
459 | } | |
bdf8afff MD |
460 | SCM_ASSERT (beg >= 0 && beg < n_frames, a->first, SCM_ARG3, s_display_backtrace); |
461 | SCM_ASSERT (n > 0, a->depth, SCM_ARG4, s_display_backtrace); | |
ab4f3efb MD |
462 | |
463 | /* Create a string port used for adaptation of printing parameters. */ | |
464 | sport = scm_mkstrport (SCM_INUM0, | |
465 | scm_make_string (SCM_MAKINUM (240), SCM_UNDEFINED), | |
466 | SCM_OPN | SCM_WRTNG, | |
467 | s_display_backtrace); | |
468 | ||
469 | /* Create a print state for printing of frames. */ | |
470 | print_state = scm_make_print_state (); | |
471 | pstate = SCM_PRINT_STATE (print_state); | |
472 | pstate->writingp = 1; | |
473 | pstate->fancyp = 1; | |
e3c37929 MD |
474 | pstate->level = 2; |
475 | pstate->length = 3; | |
ab4f3efb MD |
476 | |
477 | /* First find out if it's reasonable to do indentation. */ | |
478 | if (SCM_BACKWARDS_P) | |
479 | indent_p = 0; | |
480 | else | |
481 | { | |
482 | indent_p = 1; | |
bdf8afff | 483 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb MD |
484 | for (i = 0, j = 0; i < n; ++i) |
485 | { | |
486 | if (SCM_FRAME_REAL_P (frame)) | |
487 | ++j; | |
488 | if (j > SCM_BACKTRACE_INDENT) | |
489 | { | |
490 | indent_p = 0; | |
491 | break; | |
492 | } | |
493 | frame = (SCM_BACKWARDS_P | |
494 | ? SCM_FRAME_PREV (frame) | |
495 | : SCM_FRAME_NEXT (frame)); | |
496 | } | |
497 | } | |
498 | ||
499 | /* Determine size of frame number field. */ | |
bdf8afff | 500 | j = SCM_FRAME_NUMBER (scm_stack_ref (a->stack, SCM_MAKINUM (end))); |
ab4f3efb MD |
501 | for (i = 0; j > 0; ++i) j /= 10; |
502 | nfield = i ? i : 1; | |
503 | ||
b7f3516f | 504 | scm_puts ("Backtrace:\n", a->port); |
ab4f3efb MD |
505 | |
506 | /* Print frames. */ | |
bdf8afff | 507 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb | 508 | indentation = 1; |
bdf8afff | 509 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb MD |
510 | for (i = 1; i < n; ++i) |
511 | { | |
512 | if (indent_p && SCM_FRAME_EVAL_ARGS_P (frame)) | |
513 | ++indentation; | |
514 | frame = SCM_BACKWARDS_P ? SCM_FRAME_PREV (frame) : SCM_FRAME_NEXT (frame); | |
bdf8afff | 515 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb | 516 | } |
bdf8afff MD |
517 | |
518 | return SCM_UNSPECIFIED; | |
519 | } | |
520 | ||
521 | SCM | |
522 | scm_display_backtrace (stack, port, first, depth) | |
523 | SCM stack; | |
524 | SCM port; | |
525 | SCM first; | |
526 | SCM depth; | |
527 | { | |
528 | struct display_backtrace_args a = { stack, port, first, depth }; | |
529 | struct display_error_handler_data data = { "backtrace", port }; | |
530 | scm_internal_catch (SCM_BOOL_T, | |
531 | (scm_catch_body_t) display_backtrace_body, &a, | |
532 | (scm_catch_handler_t) display_error_handler, &data); | |
ab4f3efb MD |
533 | return SCM_UNSPECIFIED; |
534 | } | |
535 | ||
78f9f47b | 536 | SCM_VCELL (scm_has_shown_backtrace_hint_p_var, "has-shown-backtrace-hint?"); |
5aab5d96 MD |
537 | |
538 | SCM_PROC(s_backtrace, "backtrace", 0, 0, 0, scm_backtrace); | |
539 | SCM | |
540 | scm_backtrace () | |
541 | { | |
a5d6d578 MD |
542 | SCM the_last_stack = scm_fluid_ref (SCM_CDR (scm_the_last_stack_var)); |
543 | if (SCM_NFALSEP (the_last_stack)) | |
5aab5d96 MD |
544 | { |
545 | scm_newline (scm_cur_outp); | |
a5d6d578 | 546 | scm_display_backtrace (the_last_stack, |
5aab5d96 MD |
547 | scm_cur_outp, |
548 | SCM_UNDEFINED, | |
549 | SCM_UNDEFINED); | |
550 | scm_newline (scm_cur_outp); | |
551 | if (SCM_FALSEP (SCM_CDR (scm_has_shown_backtrace_hint_p_var)) | |
552 | && !SCM_BACKTRACE_P) | |
553 | { | |
b7f3516f TT |
554 | scm_puts ("Type \"(debug-enable 'backtrace)\" if you would like " |
555 | "a backtrace\n" | |
556 | "automatically if an error occurs in the future.\n", | |
557 | scm_cur_outp); | |
5aab5d96 MD |
558 | SCM_SETCDR (scm_has_shown_backtrace_hint_p_var, SCM_BOOL_T); |
559 | } | |
560 | } | |
561 | else | |
562 | { | |
b7f3516f | 563 | scm_puts ("No backtrace available.\n", scm_cur_outp); |
5aab5d96 MD |
564 | } |
565 | return SCM_UNSPECIFIED; | |
566 | } | |
567 | ||
ab4f3efb MD |
568 | \f |
569 | ||
570 | void | |
571 | scm_init_backtrace () | |
572 | { | |
a5d6d578 MD |
573 | SCM f = scm_make_fluid (); |
574 | scm_the_last_stack_var = scm_sysintern ("the-last-stack", f); | |
5aab5d96 | 575 | |
ab4f3efb MD |
576 | #include "backtrace.x" |
577 | } |