Commit | Line | Data |
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ab4f3efb | 1 | /* Printing of backtraces and error messages |
78a0461a | 2 | * Copyright (C) 1996, 1997, 1998, 1999 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 | 45 | |
1bbd0b84 GB |
46 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, |
47 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
48 | ||
49 | ||
ab4f3efb | 50 | #include <stdio.h> |
2b407f9b MD |
51 | #include <ctype.h> |
52 | ||
2fb36297 JB |
53 | #include "_scm.h" |
54 | ||
b1508ade MD |
55 | #ifdef HAVE_UNISTD_H |
56 | #include <unistd.h> | |
57 | #endif | |
58 | ||
ab4f3efb MD |
59 | #include "stacks.h" |
60 | #include "srcprop.h" | |
ab4f3efb MD |
61 | #include "struct.h" |
62 | #include "strports.h" | |
bdf8afff | 63 | #include "throw.h" |
a5d6d578 | 64 | #include "fluids.h" |
f04d8caf | 65 | #include "ports.h" |
7ab3fdd5 | 66 | #include "strings.h" |
ab4f3efb | 67 | |
b6791b2e | 68 | #include "validate.h" |
ab4f3efb MD |
69 | #include "backtrace.h" |
70 | ||
71 | /* {Error reporting and backtraces} | |
72 | * (A first approximation.) | |
73 | * | |
74 | * Note that these functions shouldn't generate errors themselves. | |
75 | */ | |
76 | ||
77 | #ifndef SCM_RECKLESS | |
78 | #undef SCM_ASSERT | |
79 | #define SCM_ASSERT(_cond, _arg, _pos, _subr) \ | |
80 | if (!(_cond)) \ | |
81 | return SCM_BOOL_F; | |
82 | #endif | |
83 | ||
b6609fc7 MD |
84 | SCM scm_the_last_stack_fluid; |
85 | ||
ab4f3efb | 86 | static void |
1bbd0b84 | 87 | display_header (SCM source, SCM port) |
ab4f3efb | 88 | { |
0c95b57d | 89 | SCM fname = (SCM_MEMOIZEDP (source) |
7f2d92b1 | 90 | ? scm_source_property (source, scm_sym_filename) |
ab4f3efb | 91 | : SCM_BOOL_F); |
0c95b57d | 92 | if (SCM_STRINGP (fname)) |
ab4f3efb MD |
93 | { |
94 | scm_prin1 (fname, port, 0); | |
b7f3516f | 95 | scm_putc (':', port); |
7f2d92b1 | 96 | scm_intprint (SCM_INUM (scm_source_property (source, scm_sym_line)) + 1, |
0e929db3 MD |
97 | 10, |
98 | port); | |
b7f3516f | 99 | scm_putc (':', port); |
7f2d92b1 | 100 | scm_intprint (SCM_INUM (scm_source_property (source, scm_sym_column)) + 1, |
0e929db3 MD |
101 | 10, |
102 | port); | |
ab4f3efb MD |
103 | } |
104 | else | |
b7f3516f TT |
105 | scm_puts ("ERROR", port); |
106 | scm_puts (": ", port); | |
ab4f3efb MD |
107 | } |
108 | ||
f3acc5c1 JB |
109 | |
110 | void | |
6e8d25a6 | 111 | scm_display_error_message (SCM message, SCM args, SCM port) |
ab4f3efb | 112 | { |
3fceef59 MD |
113 | if (SCM_ROSTRINGP (message) && SCM_NFALSEP (scm_list_p (args))) |
114 | { | |
115 | scm_simple_format (port, message, args); | |
116 | scm_newline (port); | |
117 | } | |
118 | else | |
ab4f3efb MD |
119 | { |
120 | scm_prin1 (message, port, 0); | |
b7f3516f | 121 | scm_putc ('\n', port); |
ab4f3efb | 122 | } |
ab4f3efb MD |
123 | } |
124 | ||
ab4f3efb | 125 | static void |
1bbd0b84 | 126 | display_expression (SCM frame,SCM pname,SCM source,SCM port) |
ab4f3efb MD |
127 | { |
128 | SCM print_state = scm_make_print_state (); | |
129 | scm_print_state *pstate = SCM_PRINT_STATE (print_state); | |
130 | pstate->writingp = 0; | |
131 | pstate->fancyp = 1; | |
132 | pstate->level = 2; | |
133 | pstate->length = 3; | |
0c95b57d | 134 | if (SCM_ROSTRINGP (pname)) |
ab4f3efb | 135 | { |
cabe682c | 136 | if (SCM_FRAMEP (frame) |
ab4f3efb | 137 | && SCM_FRAME_EVAL_ARGS_P (frame)) |
b7f3516f | 138 | scm_puts ("While evaluating arguments to ", port); |
ab4f3efb | 139 | else |
b7f3516f | 140 | scm_puts ("In procedure ", port); |
ab4f3efb | 141 | scm_iprin1 (pname, port, pstate); |
0c95b57d | 142 | if (SCM_MEMOIZEDP (source)) |
ab4f3efb | 143 | { |
b7f3516f | 144 | scm_puts (" in expression ", port); |
ab4f3efb MD |
145 | pstate->writingp = 1; |
146 | scm_iprin1 (scm_unmemoize (source), port, pstate); | |
147 | } | |
148 | } | |
149 | else if (SCM_NIMP (source)) | |
150 | { | |
b7f3516f | 151 | scm_puts ("In expression ", port); |
ab4f3efb MD |
152 | pstate->writingp = 1; |
153 | scm_iprin1 (scm_unmemoize (source), port, pstate); | |
154 | } | |
b7f3516f | 155 | scm_puts (":\n", port); |
ab4f3efb MD |
156 | scm_free_print_state (print_state); |
157 | } | |
158 | ||
bdf8afff MD |
159 | struct display_error_args { |
160 | SCM stack; | |
161 | SCM port; | |
162 | SCM subr; | |
163 | SCM message; | |
164 | SCM args; | |
165 | SCM rest; | |
166 | }; | |
167 | ||
168 | static SCM | |
39752bec | 169 | display_error_body (struct display_error_args *a) |
ab4f3efb MD |
170 | { |
171 | SCM current_frame = SCM_BOOL_F; | |
172 | SCM source = SCM_BOOL_F; | |
173 | SCM pname = SCM_BOOL_F; | |
a88a4c8a JB |
174 | SCM prev_frame = SCM_BOOL_F; |
175 | ||
841076ac | 176 | if (SCM_DEBUGGINGP |
bdf8afff MD |
177 | && SCM_STACKP (a->stack) |
178 | && SCM_STACK_LENGTH (a->stack) > 0) | |
ab4f3efb | 179 | { |
bdf8afff | 180 | current_frame = scm_stack_ref (a->stack, SCM_INUM0); |
ab4f3efb | 181 | source = SCM_FRAME_SOURCE (current_frame); |
a88a4c8a | 182 | prev_frame = SCM_FRAME_PREV (current_frame); |
0c95b57d | 183 | if (!SCM_MEMOIZEDP (source) |
a88a4c8a JB |
184 | && prev_frame != SCM_BOOL_F) |
185 | source = SCM_FRAME_SOURCE (prev_frame); | |
ab4f3efb | 186 | if (SCM_FRAME_PROC_P (current_frame) |
016e2ce1 | 187 | && scm_procedure_p (SCM_FRAME_PROC (current_frame)) == SCM_BOOL_T) |
ab4f3efb MD |
188 | pname = scm_procedure_name (SCM_FRAME_PROC (current_frame)); |
189 | } | |
0c95b57d | 190 | if (!SCM_ROSTRINGP (pname)) |
bdf8afff | 191 | pname = a->subr; |
0c95b57d | 192 | if (SCM_ROSTRINGP (pname) || SCM_MEMOIZEDP (source)) |
ab4f3efb | 193 | { |
bdf8afff MD |
194 | display_header (source, a->port); |
195 | display_expression (current_frame, pname, source, a->port); | |
ab4f3efb | 196 | } |
bdf8afff MD |
197 | display_header (source, a->port); |
198 | scm_display_error_message (a->message, a->args, a->port); | |
199 | return SCM_UNSPECIFIED; | |
200 | } | |
201 | ||
202 | struct display_error_handler_data { | |
203 | char *mode; | |
204 | SCM port; | |
205 | }; | |
206 | ||
207 | /* This is the exception handler for error reporting routines. | |
208 | Note that it is very important that this handler *doesn't* try to | |
209 | print more than the error tag, since the error very probably is | |
210 | caused by an erroneous print call-back routine. If we would | |
2fdcf8bd | 211 | try to print all objects, we would enter an infinite loop. */ |
bdf8afff MD |
212 | static SCM |
213 | display_error_handler (struct display_error_handler_data *data, | |
214 | SCM tag, SCM args) | |
215 | { | |
216 | SCM print_state = scm_make_print_state (); | |
b7f3516f TT |
217 | scm_puts ("\nException during displaying of ", data->port); |
218 | scm_puts (data->mode, data->port); | |
219 | scm_puts (": ", data->port); | |
bdf8afff | 220 | scm_iprin1 (tag, data->port, SCM_PRINT_STATE (print_state)); |
b7f3516f | 221 | scm_putc ('\n', data->port); |
bdf8afff MD |
222 | return SCM_UNSPECIFIED; |
223 | } | |
224 | ||
3b3b36dd | 225 | SCM_DEFINE (scm_display_error, "display-error", 6, 0, 0, |
1bbd0b84 GB |
226 | (SCM stack, SCM port, SCM subr, SCM message, SCM args, SCM rest), |
227 | "") | |
228 | #define FUNC_NAME s_scm_display_error | |
bdf8afff | 229 | { |
0b2cb4ee MD |
230 | struct display_error_args a; |
231 | struct display_error_handler_data data; | |
232 | a.stack = stack; | |
233 | a.port = port; | |
234 | a.subr = subr; | |
235 | a.message = message; | |
236 | a.args = args; | |
237 | a.rest = rest; | |
238 | data.mode = "error"; | |
239 | data.port = port; | |
bdf8afff MD |
240 | scm_internal_catch (SCM_BOOL_T, |
241 | (scm_catch_body_t) display_error_body, &a, | |
242 | (scm_catch_handler_t) display_error_handler, &data); | |
ab4f3efb MD |
243 | return SCM_UNSPECIFIED; |
244 | } | |
1bbd0b84 | 245 | #undef FUNC_NAME |
ab4f3efb | 246 | |
2b407f9b MD |
247 | typedef struct { |
248 | int level; | |
249 | int length; | |
250 | } print_params_t; | |
251 | ||
252 | static int n_print_params = 9; | |
253 | static print_params_t default_print_params[] = { | |
254 | { 4, 9 }, { 4, 3 }, | |
255 | { 3, 4 }, { 3, 3 }, | |
256 | { 2, 4 }, { 2, 3 }, | |
257 | { 1, 4 }, { 1, 3 }, { 1, 2 } | |
258 | }; | |
259 | static print_params_t *print_params = default_print_params; | |
260 | ||
261 | #ifdef GUILE_DEBUG | |
3b3b36dd | 262 | SCM_DEFINE (scm_set_print_params_x, "set-print-params!", 1, 0, 0, |
5623a9b4 MD |
263 | (SCM params), |
264 | "") | |
e8e9b690 | 265 | #define FUNC_NAME s_scm_set_print_params_x |
2b407f9b | 266 | { |
3fceef59 MD |
267 | int i; |
268 | int n; | |
2b407f9b MD |
269 | SCM ls; |
270 | print_params_t *new_params; | |
3fceef59 MD |
271 | |
272 | SCM_VALIDATE_NONEMPTYLIST_COPYLEN (2, params, n); | |
273 | for (ls = params; SCM_NNULLP (ls); ls = SCM_CDR (ls)) | |
2b407f9b MD |
274 | SCM_ASSERT (scm_ilength (SCM_CAR (params)) == 2 |
275 | && SCM_INUMP (SCM_CAAR (ls)) | |
276 | && SCM_INUM (SCM_CAAR (ls)) >= 0 | |
277 | && SCM_INUMP (SCM_CADAR (ls)) | |
278 | && SCM_INUM (SCM_CADAR (ls)) >= 0, | |
279 | params, | |
280 | SCM_ARG2, | |
e8e9b690 | 281 | s_scm_set_print_params_x); |
2b407f9b | 282 | new_params = scm_must_malloc (n * sizeof (print_params_t), |
1bbd0b84 | 283 | FUNC_NAME); |
2b407f9b MD |
284 | if (print_params != default_print_params) |
285 | scm_must_free (print_params); | |
286 | print_params = new_params; | |
287 | for (i = 0; i < n; ++i) | |
288 | { | |
289 | print_params[i].level = SCM_INUM (SCM_CAAR (params)); | |
290 | print_params[i].length = SCM_INUM (SCM_CADAR (params)); | |
291 | params = SCM_CDR (params); | |
292 | } | |
293 | n_print_params = n; | |
294 | return SCM_UNSPECIFIED; | |
295 | } | |
1bbd0b84 | 296 | #undef FUNC_NAME |
2b407f9b MD |
297 | #endif |
298 | ||
ab4f3efb | 299 | static void |
1bbd0b84 | 300 | indent (int n, SCM port) |
ab4f3efb MD |
301 | { |
302 | int i; | |
303 | for (i = 0; i < n; ++i) | |
b7f3516f | 304 | scm_putc (' ', port); |
ab4f3efb MD |
305 | } |
306 | ||
ab4f3efb | 307 | static void |
1bbd0b84 | 308 | display_frame_expr (char *hdr,SCM exp,char *tlr,int indentation,SCM sport,SCM port,scm_print_state *pstate) |
ab4f3efb | 309 | { |
2b407f9b MD |
310 | SCM string; |
311 | int i = 0, n; | |
312 | scm_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (sport); | |
313 | do | |
ab4f3efb | 314 | { |
2b407f9b MD |
315 | pstate->length = print_params[i].length; |
316 | ptob->seek (sport, 0, SEEK_SET); | |
0c95b57d | 317 | if (SCM_CONSP (exp)) |
2b407f9b MD |
318 | { |
319 | pstate->level = print_params[i].level - 1; | |
320 | scm_iprlist (hdr, exp, tlr[0], sport, pstate); | |
321 | scm_puts (&tlr[1], sport); | |
322 | } | |
323 | else | |
324 | { | |
325 | pstate->level = print_params[i].level; | |
326 | scm_iprin1 (exp, sport, pstate); | |
327 | } | |
328 | ptob->flush (sport); | |
329 | n = ptob->seek (sport, 0, SEEK_CUR); | |
330 | ++i; | |
ab4f3efb | 331 | } |
2b407f9b MD |
332 | while (indentation + n > SCM_BACKTRACE_WIDTH && i < n_print_params); |
333 | ptob->truncate (sport, n); | |
334 | string = scm_strport_to_string (sport); | |
335 | /* Remove control characters */ | |
336 | for (i = 0; i < n; ++i) | |
337 | if (iscntrl (SCM_CHARS (string)[i])) | |
338 | SCM_CHARS (string)[i] = ' '; | |
339 | /* Truncate */ | |
340 | if (indentation + n > SCM_BACKTRACE_WIDTH) | |
341 | { | |
342 | n = SCM_BACKTRACE_WIDTH - indentation; | |
343 | SCM_CHARS (string)[n - 1] = '$'; | |
344 | } | |
345 | ||
346 | scm_lfwrite (SCM_CHARS (string), n, port); | |
ab4f3efb MD |
347 | } |
348 | ||
e3c37929 | 349 | static void |
1bbd0b84 | 350 | display_application (SCM frame,int indentation,SCM sport,SCM port,scm_print_state *pstate) |
e3c37929 MD |
351 | { |
352 | SCM proc = SCM_FRAME_PROC (frame); | |
353 | SCM name = (SCM_NFALSEP (scm_procedure_p (proc)) | |
354 | ? scm_procedure_name (proc) | |
355 | : SCM_BOOL_F); | |
356 | display_frame_expr ("[", | |
357 | scm_cons (SCM_NFALSEP (name) ? name : proc, | |
358 | SCM_FRAME_ARGS (frame)), | |
359 | SCM_FRAME_EVAL_ARGS_P (frame) ? " ..." : "]", | |
360 | indentation, | |
361 | sport, | |
362 | port, | |
363 | pstate); | |
364 | } | |
365 | ||
3b3b36dd | 366 | SCM_DEFINE (scm_display_application, "display-application", 1, 2, 0, |
1bbd0b84 GB |
367 | (SCM frame, SCM port, SCM indent), |
368 | "") | |
369 | #define FUNC_NAME s_scm_display_application | |
e3c37929 | 370 | { |
3b3b36dd | 371 | SCM_VALIDATE_FRAME (1,frame); |
e3c37929 MD |
372 | if (SCM_UNBNDP (port)) |
373 | port = scm_cur_outp; | |
2b407f9b | 374 | else |
3b3b36dd | 375 | SCM_VALIDATE_OPOUTPORT (2,port); |
2b407f9b MD |
376 | if (SCM_UNBNDP (indent)) |
377 | indent = SCM_INUM0; | |
378 | else | |
3b3b36dd | 379 | SCM_VALIDATE_INUM (3,indent); |
2b407f9b | 380 | |
e3c37929 MD |
381 | if (SCM_FRAME_PROC_P (frame)) |
382 | /* Display an application. */ | |
383 | { | |
2b407f9b | 384 | SCM sport, print_state; |
e3c37929 MD |
385 | scm_print_state *pstate; |
386 | ||
2b407f9b MD |
387 | /* Create a string port used for adaptation of printing parameters. */ |
388 | sport = scm_mkstrport (SCM_INUM0, | |
389 | scm_make_string (SCM_MAKINUM (240), | |
390 | SCM_UNDEFINED), | |
391 | SCM_OPN | SCM_WRTNG, | |
1bbd0b84 | 392 | FUNC_NAME); |
2b407f9b | 393 | |
e3c37929 MD |
394 | /* Create a print state for printing of frames. */ |
395 | print_state = scm_make_print_state (); | |
396 | pstate = SCM_PRINT_STATE (print_state); | |
397 | pstate->writingp = 1; | |
398 | pstate->fancyp = 1; | |
e3c37929 | 399 | |
2b407f9b | 400 | display_application (frame, SCM_INUM (indent), sport, port, pstate); |
e3c37929 MD |
401 | return SCM_BOOL_T; |
402 | } | |
403 | else | |
404 | return SCM_BOOL_F; | |
405 | } | |
1bbd0b84 | 406 | #undef FUNC_NAME |
e3c37929 | 407 | |
ab4f3efb | 408 | static void |
1bbd0b84 | 409 | display_frame (SCM frame,int nfield,int indentation,SCM sport,SCM port,scm_print_state *pstate) |
ab4f3efb MD |
410 | { |
411 | int n, i, j; | |
412 | ||
413 | /* Announce missing frames? */ | |
414 | if (!SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
415 | { | |
416 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 417 | scm_puts ("...\n", port); |
ab4f3efb MD |
418 | } |
419 | ||
420 | /* Check size of frame number. */ | |
421 | n = SCM_FRAME_NUMBER (frame); | |
422 | for (i = 0, j = n; j > 0; ++i) j /= 10; | |
423 | ||
424 | /* Number indentation. */ | |
425 | indent (nfield - (i ? i : 1), port); | |
426 | ||
427 | /* Frame number. */ | |
428 | scm_iprin1 (SCM_MAKINUM (n), port, pstate); | |
429 | ||
430 | /* Real frame marker */ | |
b7f3516f | 431 | scm_putc (SCM_FRAME_REAL_P (frame) ? '*' : ' ', port); |
ab4f3efb MD |
432 | |
433 | /* Indentation. */ | |
434 | indent (indentation, port); | |
435 | ||
436 | if (SCM_FRAME_PROC_P (frame)) | |
437 | /* Display an application. */ | |
e3c37929 | 438 | display_application (frame, nfield + 1 + indentation, sport, port, pstate); |
ab4f3efb MD |
439 | else |
440 | /* Display a special form. */ | |
441 | { | |
442 | SCM source = SCM_FRAME_SOURCE (frame); | |
0c95b57d | 443 | SCM copy = (SCM_CONSP (source) |
7f2d92b1 | 444 | ? scm_source_property (source, scm_sym_copy) |
2e9d6c6d | 445 | : SCM_BOOL_F); |
0c95b57d | 446 | SCM umcopy = (SCM_MEMOIZEDP (source) |
2e9d6c6d MD |
447 | ? scm_unmemoize (source) |
448 | : SCM_BOOL_F); | |
ab4f3efb | 449 | display_frame_expr ("(", |
0c95b57d | 450 | SCM_CONSP (copy) ? copy : umcopy, |
ab4f3efb MD |
451 | ")", |
452 | nfield + 1 + indentation, | |
453 | sport, | |
454 | port, | |
455 | pstate); | |
456 | } | |
1ae6af28 | 457 | scm_putc ('\n', port); |
ab4f3efb MD |
458 | |
459 | /* Announce missing frames? */ | |
460 | if (SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
461 | { | |
462 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 463 | scm_puts ("...\n", port); |
ab4f3efb MD |
464 | } |
465 | } | |
466 | ||
bdf8afff MD |
467 | struct display_backtrace_args { |
468 | SCM stack; | |
469 | SCM port; | |
470 | SCM first; | |
471 | SCM depth; | |
472 | }; | |
473 | ||
bdf8afff | 474 | static SCM |
1bbd0b84 GB |
475 | display_backtrace_body(struct display_backtrace_args *a) |
476 | #define FUNC_NAME "display_backtrace_body" | |
ab4f3efb MD |
477 | { |
478 | int n_frames, beg, end, n, i, j; | |
479 | int nfield, indent_p, indentation; | |
480 | SCM frame, sport, print_state; | |
481 | scm_print_state *pstate; | |
482 | ||
78446828 MV |
483 | a->port = SCM_COERCE_OUTPORT (a->port); |
484 | ||
ab4f3efb | 485 | /* Argument checking and extraction. */ |
0c95b57d | 486 | SCM_ASSERT (SCM_STACKP (a->stack), |
bdf8afff | 487 | a->stack, |
ab4f3efb MD |
488 | SCM_ARG1, |
489 | s_display_backtrace); | |
0c95b57d | 490 | SCM_ASSERT (SCM_OPOUTPORTP (a->port), |
bdf8afff | 491 | a->port, |
ab4f3efb MD |
492 | SCM_ARG2, |
493 | s_display_backtrace); | |
bdf8afff MD |
494 | n_frames = SCM_INUM (scm_stack_length (a->stack)); |
495 | n = SCM_INUMP (a->depth) ? SCM_INUM (a->depth) : SCM_BACKTRACE_DEPTH; | |
ab4f3efb MD |
496 | if (SCM_BACKWARDS_P) |
497 | { | |
bdf8afff | 498 | beg = SCM_INUMP (a->first) ? SCM_INUM (a->first) : 0; |
ab4f3efb MD |
499 | end = beg + n - 1; |
500 | if (end >= n_frames) | |
501 | end = n_frames - 1; | |
502 | n = end - beg + 1; | |
503 | } | |
504 | else | |
505 | { | |
bdf8afff | 506 | if (SCM_INUMP (a->first)) |
ab4f3efb | 507 | { |
bdf8afff | 508 | beg = SCM_INUM (a->first); |
ab4f3efb MD |
509 | end = beg - n + 1; |
510 | if (end < 0) | |
511 | end = 0; | |
512 | } | |
513 | else | |
514 | { | |
515 | beg = n - 1; | |
516 | end = 0; | |
517 | if (beg >= n_frames) | |
518 | beg = n_frames - 1; | |
519 | } | |
520 | n = beg - end + 1; | |
521 | } | |
bdf8afff MD |
522 | SCM_ASSERT (beg >= 0 && beg < n_frames, a->first, SCM_ARG3, s_display_backtrace); |
523 | SCM_ASSERT (n > 0, a->depth, SCM_ARG4, s_display_backtrace); | |
ab4f3efb MD |
524 | |
525 | /* Create a string port used for adaptation of printing parameters. */ | |
526 | sport = scm_mkstrport (SCM_INUM0, | |
527 | scm_make_string (SCM_MAKINUM (240), SCM_UNDEFINED), | |
528 | SCM_OPN | SCM_WRTNG, | |
1bbd0b84 | 529 | FUNC_NAME); |
ab4f3efb MD |
530 | |
531 | /* Create a print state for printing of frames. */ | |
532 | print_state = scm_make_print_state (); | |
533 | pstate = SCM_PRINT_STATE (print_state); | |
534 | pstate->writingp = 1; | |
535 | pstate->fancyp = 1; | |
536 | ||
537 | /* First find out if it's reasonable to do indentation. */ | |
538 | if (SCM_BACKWARDS_P) | |
539 | indent_p = 0; | |
540 | else | |
541 | { | |
542 | indent_p = 1; | |
bdf8afff | 543 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb MD |
544 | for (i = 0, j = 0; i < n; ++i) |
545 | { | |
546 | if (SCM_FRAME_REAL_P (frame)) | |
547 | ++j; | |
548 | if (j > SCM_BACKTRACE_INDENT) | |
549 | { | |
550 | indent_p = 0; | |
551 | break; | |
552 | } | |
553 | frame = (SCM_BACKWARDS_P | |
554 | ? SCM_FRAME_PREV (frame) | |
555 | : SCM_FRAME_NEXT (frame)); | |
556 | } | |
557 | } | |
558 | ||
559 | /* Determine size of frame number field. */ | |
bdf8afff | 560 | j = SCM_FRAME_NUMBER (scm_stack_ref (a->stack, SCM_MAKINUM (end))); |
ab4f3efb MD |
561 | for (i = 0; j > 0; ++i) j /= 10; |
562 | nfield = i ? i : 1; | |
563 | ||
ab4f3efb | 564 | /* Print frames. */ |
bdf8afff | 565 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb | 566 | indentation = 1; |
bdf8afff | 567 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb MD |
568 | for (i = 1; i < n; ++i) |
569 | { | |
570 | if (indent_p && SCM_FRAME_EVAL_ARGS_P (frame)) | |
571 | ++indentation; | |
572 | frame = SCM_BACKWARDS_P ? SCM_FRAME_PREV (frame) : SCM_FRAME_NEXT (frame); | |
bdf8afff | 573 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb | 574 | } |
bdf8afff MD |
575 | |
576 | return SCM_UNSPECIFIED; | |
577 | } | |
1bbd0b84 | 578 | #undef FUNC_NAME |
bdf8afff | 579 | |
3b3b36dd | 580 | SCM_DEFINE (scm_display_backtrace, "display-backtrace", 2, 2, 0, |
1bbd0b84 GB |
581 | (SCM stack, SCM port, SCM first, SCM depth), |
582 | "") | |
583 | #define FUNC_NAME s_scm_display_backtrace | |
bdf8afff | 584 | { |
0b2cb4ee MD |
585 | struct display_backtrace_args a; |
586 | struct display_error_handler_data data; | |
587 | a.stack = stack; | |
588 | a.port = port; | |
589 | a.first = first; | |
590 | a.depth = depth; | |
591 | data.mode = "backtrace"; | |
592 | data.port = port; | |
bdf8afff MD |
593 | scm_internal_catch (SCM_BOOL_T, |
594 | (scm_catch_body_t) display_backtrace_body, &a, | |
595 | (scm_catch_handler_t) display_error_handler, &data); | |
ab4f3efb MD |
596 | return SCM_UNSPECIFIED; |
597 | } | |
1bbd0b84 | 598 | #undef FUNC_NAME |
ab4f3efb | 599 | |
78f9f47b | 600 | SCM_VCELL (scm_has_shown_backtrace_hint_p_var, "has-shown-backtrace-hint?"); |
5aab5d96 | 601 | |
3b3b36dd | 602 | SCM_DEFINE (scm_backtrace, "backtrace", 0, 0, 0, |
1bbd0b84 GB |
603 | (), |
604 | "") | |
605 | #define FUNC_NAME s_scm_backtrace | |
5aab5d96 | 606 | { |
b6609fc7 | 607 | SCM the_last_stack = scm_fluid_ref (SCM_CDR (scm_the_last_stack_fluid)); |
a5d6d578 | 608 | if (SCM_NFALSEP (the_last_stack)) |
5aab5d96 MD |
609 | { |
610 | scm_newline (scm_cur_outp); | |
3a1f8447 | 611 | scm_puts ("Backtrace:\n", scm_cur_outp); |
a5d6d578 | 612 | scm_display_backtrace (the_last_stack, |
5aab5d96 MD |
613 | scm_cur_outp, |
614 | SCM_UNDEFINED, | |
615 | SCM_UNDEFINED); | |
616 | scm_newline (scm_cur_outp); | |
617 | if (SCM_FALSEP (SCM_CDR (scm_has_shown_backtrace_hint_p_var)) | |
618 | && !SCM_BACKTRACE_P) | |
619 | { | |
b7f3516f TT |
620 | scm_puts ("Type \"(debug-enable 'backtrace)\" if you would like " |
621 | "a backtrace\n" | |
622 | "automatically if an error occurs in the future.\n", | |
623 | scm_cur_outp); | |
5aab5d96 MD |
624 | SCM_SETCDR (scm_has_shown_backtrace_hint_p_var, SCM_BOOL_T); |
625 | } | |
626 | } | |
627 | else | |
628 | { | |
b7f3516f | 629 | scm_puts ("No backtrace available.\n", scm_cur_outp); |
5aab5d96 MD |
630 | } |
631 | return SCM_UNSPECIFIED; | |
632 | } | |
1bbd0b84 | 633 | #undef FUNC_NAME |
5aab5d96 | 634 | |
ab4f3efb MD |
635 | \f |
636 | ||
637 | void | |
638 | scm_init_backtrace () | |
639 | { | |
a5d6d578 | 640 | SCM f = scm_make_fluid (); |
b6609fc7 | 641 | scm_the_last_stack_fluid = scm_sysintern ("the-last-stack", f); |
5aab5d96 | 642 | |
ab4f3efb MD |
643 | #include "backtrace.x" |
644 | } | |
89e00824 ML |
645 | |
646 | /* | |
647 | Local Variables: | |
648 | c-file-style: "gnu" | |
649 | End: | |
650 | */ |