Commit | Line | Data |
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ab4f3efb | 1 | /* Printing of backtraces and error messages |
f2c9fcb0 | 2 | * Copyright (C) 1996, 1997, 1998, 1999, 2000 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 | ||
a0599745 | 53 | #include "libguile/_scm.h" |
2fb36297 | 54 | |
b1508ade MD |
55 | #ifdef HAVE_UNISTD_H |
56 | #include <unistd.h> | |
57 | #endif | |
58 | ||
a0599745 MD |
59 | #include "libguile/stacks.h" |
60 | #include "libguile/srcprop.h" | |
61 | #include "libguile/struct.h" | |
62 | #include "libguile/strports.h" | |
63 | #include "libguile/throw.h" | |
64 | #include "libguile/fluids.h" | |
65 | #include "libguile/ports.h" | |
66 | #include "libguile/strings.h" | |
ab4f3efb | 67 | |
a0599745 MD |
68 | #include "libguile/validate.h" |
69 | #include "libguile/backtrace.h" | |
ab4f3efb MD |
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 | { |
b24b5e13 | 113 | if (SCM_STRINGP (message) && !SCM_FALSEP (scm_list_p (args))) |
3fceef59 MD |
114 | { |
115 | scm_simple_format (port, message, args); | |
116 | scm_newline (port); | |
117 | } | |
118 | else | |
ab4f3efb | 119 | { |
b24b5e13 DH |
120 | scm_display (message, port); |
121 | scm_newline (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; | |
b24b5e13 | 134 | if (SCM_SYMBOLP (pname) || SCM_STRINGP (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; | |
a88a4c8a | 173 | SCM prev_frame = SCM_BOOL_F; |
b24b5e13 | 174 | SCM pname = a->subr; |
a88a4c8a | 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); |
cffcab30 | 183 | if (!SCM_MEMOIZEDP (source) && !SCM_FALSEP (prev_frame)) |
a88a4c8a | 184 | source = SCM_FRAME_SOURCE (prev_frame); |
b24b5e13 | 185 | if (!SCM_SYMBOLP (pname) && !SCM_STRINGP (pname) && SCM_FRAME_PROC_P (current_frame) |
9a09deb1 | 186 | && SCM_EQ_P (scm_procedure_p (SCM_FRAME_PROC (current_frame)), SCM_BOOL_T)) |
ab4f3efb MD |
187 | pname = scm_procedure_name (SCM_FRAME_PROC (current_frame)); |
188 | } | |
b24b5e13 | 189 | if (SCM_SYMBOLP (pname) || SCM_STRINGP (pname) || SCM_MEMOIZEDP (source)) |
ab4f3efb | 190 | { |
bdf8afff MD |
191 | display_header (source, a->port); |
192 | display_expression (current_frame, pname, source, a->port); | |
ab4f3efb | 193 | } |
bdf8afff MD |
194 | display_header (source, a->port); |
195 | scm_display_error_message (a->message, a->args, a->port); | |
196 | return SCM_UNSPECIFIED; | |
197 | } | |
198 | ||
199 | struct display_error_handler_data { | |
200 | char *mode; | |
201 | SCM port; | |
202 | }; | |
203 | ||
204 | /* This is the exception handler for error reporting routines. | |
205 | Note that it is very important that this handler *doesn't* try to | |
206 | print more than the error tag, since the error very probably is | |
207 | caused by an erroneous print call-back routine. If we would | |
2fdcf8bd | 208 | try to print all objects, we would enter an infinite loop. */ |
bdf8afff MD |
209 | static SCM |
210 | display_error_handler (struct display_error_handler_data *data, | |
211 | SCM tag, SCM args) | |
212 | { | |
213 | SCM print_state = scm_make_print_state (); | |
b7f3516f TT |
214 | scm_puts ("\nException during displaying of ", data->port); |
215 | scm_puts (data->mode, data->port); | |
216 | scm_puts (": ", data->port); | |
bdf8afff | 217 | scm_iprin1 (tag, data->port, SCM_PRINT_STATE (print_state)); |
b7f3516f | 218 | scm_putc ('\n', data->port); |
bdf8afff MD |
219 | return SCM_UNSPECIFIED; |
220 | } | |
221 | ||
e40a4095 DH |
222 | |
223 | /* The function scm_i_display_error prints out a detailed error message. This | |
224 | * function will be called directly within libguile to signal error messages. | |
225 | * No parameter checks will be performed by scm_i_display_error. Thus, User | |
226 | * code should rather use the function scm_display_error. | |
227 | */ | |
228 | void | |
229 | scm_i_display_error (SCM stack, SCM port, SCM subr, SCM message, SCM args, SCM rest) | |
bdf8afff | 230 | { |
0b2cb4ee MD |
231 | struct display_error_args a; |
232 | struct display_error_handler_data data; | |
233 | a.stack = stack; | |
234 | a.port = port; | |
235 | a.subr = subr; | |
236 | a.message = message; | |
237 | a.args = args; | |
238 | a.rest = rest; | |
239 | data.mode = "error"; | |
240 | data.port = port; | |
bdf8afff MD |
241 | scm_internal_catch (SCM_BOOL_T, |
242 | (scm_catch_body_t) display_error_body, &a, | |
243 | (scm_catch_handler_t) display_error_handler, &data); | |
e40a4095 DH |
244 | } |
245 | ||
246 | ||
247 | SCM_DEFINE (scm_display_error, "display-error", 6, 0, 0, | |
248 | (SCM stack, SCM port, SCM subr, SCM message, SCM args, SCM rest), | |
249 | "") | |
250 | #define FUNC_NAME s_scm_display_error | |
251 | { | |
252 | SCM_VALIDATE_OUTPUT_PORT (2, port); | |
253 | ||
254 | scm_i_display_error (stack, port, subr, message, args, rest); | |
255 | ||
ab4f3efb MD |
256 | return SCM_UNSPECIFIED; |
257 | } | |
1bbd0b84 | 258 | #undef FUNC_NAME |
ab4f3efb | 259 | |
e40a4095 | 260 | |
2b407f9b MD |
261 | typedef struct { |
262 | int level; | |
263 | int length; | |
264 | } print_params_t; | |
265 | ||
266 | static int n_print_params = 9; | |
267 | static print_params_t default_print_params[] = { | |
268 | { 4, 9 }, { 4, 3 }, | |
269 | { 3, 4 }, { 3, 3 }, | |
270 | { 2, 4 }, { 2, 3 }, | |
271 | { 1, 4 }, { 1, 3 }, { 1, 2 } | |
272 | }; | |
273 | static print_params_t *print_params = default_print_params; | |
274 | ||
275 | #ifdef GUILE_DEBUG | |
3b3b36dd | 276 | SCM_DEFINE (scm_set_print_params_x, "set-print-params!", 1, 0, 0, |
5623a9b4 MD |
277 | (SCM params), |
278 | "") | |
e8e9b690 | 279 | #define FUNC_NAME s_scm_set_print_params_x |
2b407f9b | 280 | { |
3fceef59 MD |
281 | int i; |
282 | int n; | |
2b407f9b MD |
283 | SCM ls; |
284 | print_params_t *new_params; | |
3fceef59 MD |
285 | |
286 | SCM_VALIDATE_NONEMPTYLIST_COPYLEN (2, params, n); | |
287 | for (ls = params; SCM_NNULLP (ls); ls = SCM_CDR (ls)) | |
2b407f9b MD |
288 | SCM_ASSERT (scm_ilength (SCM_CAR (params)) == 2 |
289 | && SCM_INUMP (SCM_CAAR (ls)) | |
290 | && SCM_INUM (SCM_CAAR (ls)) >= 0 | |
291 | && SCM_INUMP (SCM_CADAR (ls)) | |
292 | && SCM_INUM (SCM_CADAR (ls)) >= 0, | |
293 | params, | |
294 | SCM_ARG2, | |
e8e9b690 | 295 | s_scm_set_print_params_x); |
2b407f9b | 296 | new_params = scm_must_malloc (n * sizeof (print_params_t), |
1bbd0b84 | 297 | FUNC_NAME); |
2b407f9b MD |
298 | if (print_params != default_print_params) |
299 | scm_must_free (print_params); | |
300 | print_params = new_params; | |
301 | for (i = 0; i < n; ++i) | |
302 | { | |
303 | print_params[i].level = SCM_INUM (SCM_CAAR (params)); | |
304 | print_params[i].length = SCM_INUM (SCM_CADAR (params)); | |
305 | params = SCM_CDR (params); | |
306 | } | |
307 | n_print_params = n; | |
308 | return SCM_UNSPECIFIED; | |
309 | } | |
1bbd0b84 | 310 | #undef FUNC_NAME |
2b407f9b MD |
311 | #endif |
312 | ||
ab4f3efb | 313 | static void |
1bbd0b84 | 314 | indent (int n, SCM port) |
ab4f3efb MD |
315 | { |
316 | int i; | |
317 | for (i = 0; i < n; ++i) | |
b7f3516f | 318 | scm_putc (' ', port); |
ab4f3efb MD |
319 | } |
320 | ||
ab4f3efb | 321 | static void |
1bbd0b84 | 322 | display_frame_expr (char *hdr,SCM exp,char *tlr,int indentation,SCM sport,SCM port,scm_print_state *pstate) |
ab4f3efb | 323 | { |
2b407f9b MD |
324 | SCM string; |
325 | int i = 0, n; | |
326 | scm_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (sport); | |
327 | do | |
ab4f3efb | 328 | { |
2b407f9b MD |
329 | pstate->length = print_params[i].length; |
330 | ptob->seek (sport, 0, SEEK_SET); | |
0c95b57d | 331 | if (SCM_CONSP (exp)) |
2b407f9b MD |
332 | { |
333 | pstate->level = print_params[i].level - 1; | |
334 | scm_iprlist (hdr, exp, tlr[0], sport, pstate); | |
335 | scm_puts (&tlr[1], sport); | |
336 | } | |
337 | else | |
338 | { | |
339 | pstate->level = print_params[i].level; | |
340 | scm_iprin1 (exp, sport, pstate); | |
341 | } | |
342 | ptob->flush (sport); | |
343 | n = ptob->seek (sport, 0, SEEK_CUR); | |
344 | ++i; | |
ab4f3efb | 345 | } |
2b407f9b MD |
346 | while (indentation + n > SCM_BACKTRACE_WIDTH && i < n_print_params); |
347 | ptob->truncate (sport, n); | |
348 | string = scm_strport_to_string (sport); | |
349 | /* Remove control characters */ | |
350 | for (i = 0; i < n; ++i) | |
86c991c2 DH |
351 | if (iscntrl (SCM_STRING_CHARS (string)[i])) |
352 | SCM_STRING_CHARS (string)[i] = ' '; | |
2b407f9b MD |
353 | /* Truncate */ |
354 | if (indentation + n > SCM_BACKTRACE_WIDTH) | |
355 | { | |
356 | n = SCM_BACKTRACE_WIDTH - indentation; | |
86c991c2 | 357 | SCM_STRING_CHARS (string)[n - 1] = '$'; |
2b407f9b MD |
358 | } |
359 | ||
86c991c2 | 360 | scm_lfwrite (SCM_STRING_CHARS (string), n, port); |
ab4f3efb MD |
361 | } |
362 | ||
e3c37929 | 363 | static void |
1bbd0b84 | 364 | display_application (SCM frame,int indentation,SCM sport,SCM port,scm_print_state *pstate) |
e3c37929 MD |
365 | { |
366 | SCM proc = SCM_FRAME_PROC (frame); | |
367 | SCM name = (SCM_NFALSEP (scm_procedure_p (proc)) | |
368 | ? scm_procedure_name (proc) | |
369 | : SCM_BOOL_F); | |
370 | display_frame_expr ("[", | |
371 | scm_cons (SCM_NFALSEP (name) ? name : proc, | |
372 | SCM_FRAME_ARGS (frame)), | |
373 | SCM_FRAME_EVAL_ARGS_P (frame) ? " ..." : "]", | |
374 | indentation, | |
375 | sport, | |
376 | port, | |
377 | pstate); | |
378 | } | |
379 | ||
3b3b36dd | 380 | SCM_DEFINE (scm_display_application, "display-application", 1, 2, 0, |
1bbd0b84 GB |
381 | (SCM frame, SCM port, SCM indent), |
382 | "") | |
383 | #define FUNC_NAME s_scm_display_application | |
e3c37929 | 384 | { |
3b3b36dd | 385 | SCM_VALIDATE_FRAME (1,frame); |
e3c37929 MD |
386 | if (SCM_UNBNDP (port)) |
387 | port = scm_cur_outp; | |
2b407f9b | 388 | else |
3b3b36dd | 389 | SCM_VALIDATE_OPOUTPORT (2,port); |
2b407f9b MD |
390 | if (SCM_UNBNDP (indent)) |
391 | indent = SCM_INUM0; | |
392 | else | |
3b3b36dd | 393 | SCM_VALIDATE_INUM (3,indent); |
2b407f9b | 394 | |
e3c37929 MD |
395 | if (SCM_FRAME_PROC_P (frame)) |
396 | /* Display an application. */ | |
397 | { | |
2b407f9b | 398 | SCM sport, print_state; |
e3c37929 MD |
399 | scm_print_state *pstate; |
400 | ||
2b407f9b MD |
401 | /* Create a string port used for adaptation of printing parameters. */ |
402 | sport = scm_mkstrport (SCM_INUM0, | |
403 | scm_make_string (SCM_MAKINUM (240), | |
404 | SCM_UNDEFINED), | |
405 | SCM_OPN | SCM_WRTNG, | |
1bbd0b84 | 406 | FUNC_NAME); |
2b407f9b | 407 | |
e3c37929 MD |
408 | /* Create a print state for printing of frames. */ |
409 | print_state = scm_make_print_state (); | |
410 | pstate = SCM_PRINT_STATE (print_state); | |
411 | pstate->writingp = 1; | |
412 | pstate->fancyp = 1; | |
e3c37929 | 413 | |
2b407f9b | 414 | display_application (frame, SCM_INUM (indent), sport, port, pstate); |
e3c37929 MD |
415 | return SCM_BOOL_T; |
416 | } | |
417 | else | |
418 | return SCM_BOOL_F; | |
419 | } | |
1bbd0b84 | 420 | #undef FUNC_NAME |
e3c37929 | 421 | |
ab4f3efb | 422 | static void |
1bbd0b84 | 423 | display_frame (SCM frame,int nfield,int indentation,SCM sport,SCM port,scm_print_state *pstate) |
ab4f3efb MD |
424 | { |
425 | int n, i, j; | |
426 | ||
427 | /* Announce missing frames? */ | |
428 | if (!SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
429 | { | |
430 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 431 | scm_puts ("...\n", port); |
ab4f3efb MD |
432 | } |
433 | ||
434 | /* Check size of frame number. */ | |
435 | n = SCM_FRAME_NUMBER (frame); | |
436 | for (i = 0, j = n; j > 0; ++i) j /= 10; | |
437 | ||
438 | /* Number indentation. */ | |
439 | indent (nfield - (i ? i : 1), port); | |
440 | ||
441 | /* Frame number. */ | |
442 | scm_iprin1 (SCM_MAKINUM (n), port, pstate); | |
443 | ||
444 | /* Real frame marker */ | |
b7f3516f | 445 | scm_putc (SCM_FRAME_REAL_P (frame) ? '*' : ' ', port); |
ab4f3efb MD |
446 | |
447 | /* Indentation. */ | |
448 | indent (indentation, port); | |
449 | ||
450 | if (SCM_FRAME_PROC_P (frame)) | |
451 | /* Display an application. */ | |
e3c37929 | 452 | display_application (frame, nfield + 1 + indentation, sport, port, pstate); |
ab4f3efb MD |
453 | else |
454 | /* Display a special form. */ | |
455 | { | |
456 | SCM source = SCM_FRAME_SOURCE (frame); | |
0c95b57d | 457 | SCM copy = (SCM_CONSP (source) |
7f2d92b1 | 458 | ? scm_source_property (source, scm_sym_copy) |
2e9d6c6d | 459 | : SCM_BOOL_F); |
0c95b57d | 460 | SCM umcopy = (SCM_MEMOIZEDP (source) |
2e9d6c6d MD |
461 | ? scm_unmemoize (source) |
462 | : SCM_BOOL_F); | |
ab4f3efb | 463 | display_frame_expr ("(", |
0c95b57d | 464 | SCM_CONSP (copy) ? copy : umcopy, |
ab4f3efb MD |
465 | ")", |
466 | nfield + 1 + indentation, | |
467 | sport, | |
468 | port, | |
469 | pstate); | |
470 | } | |
1ae6af28 | 471 | scm_putc ('\n', port); |
ab4f3efb MD |
472 | |
473 | /* Announce missing frames? */ | |
474 | if (SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame)) | |
475 | { | |
476 | indent (nfield + 1 + indentation, port); | |
b7f3516f | 477 | scm_puts ("...\n", port); |
ab4f3efb MD |
478 | } |
479 | } | |
480 | ||
bdf8afff MD |
481 | struct display_backtrace_args { |
482 | SCM stack; | |
483 | SCM port; | |
484 | SCM first; | |
485 | SCM depth; | |
486 | }; | |
487 | ||
bdf8afff | 488 | static SCM |
1bbd0b84 GB |
489 | display_backtrace_body(struct display_backtrace_args *a) |
490 | #define FUNC_NAME "display_backtrace_body" | |
ab4f3efb MD |
491 | { |
492 | int n_frames, beg, end, n, i, j; | |
493 | int nfield, indent_p, indentation; | |
494 | SCM frame, sport, print_state; | |
495 | scm_print_state *pstate; | |
496 | ||
78446828 MV |
497 | a->port = SCM_COERCE_OUTPORT (a->port); |
498 | ||
ab4f3efb | 499 | /* Argument checking and extraction. */ |
0c95b57d | 500 | SCM_ASSERT (SCM_STACKP (a->stack), |
bdf8afff | 501 | a->stack, |
ab4f3efb MD |
502 | SCM_ARG1, |
503 | s_display_backtrace); | |
0c95b57d | 504 | SCM_ASSERT (SCM_OPOUTPORTP (a->port), |
bdf8afff | 505 | a->port, |
ab4f3efb MD |
506 | SCM_ARG2, |
507 | s_display_backtrace); | |
bdf8afff MD |
508 | n_frames = SCM_INUM (scm_stack_length (a->stack)); |
509 | n = SCM_INUMP (a->depth) ? SCM_INUM (a->depth) : SCM_BACKTRACE_DEPTH; | |
ab4f3efb MD |
510 | if (SCM_BACKWARDS_P) |
511 | { | |
bdf8afff | 512 | beg = SCM_INUMP (a->first) ? SCM_INUM (a->first) : 0; |
ab4f3efb MD |
513 | end = beg + n - 1; |
514 | if (end >= n_frames) | |
515 | end = n_frames - 1; | |
516 | n = end - beg + 1; | |
517 | } | |
518 | else | |
519 | { | |
bdf8afff | 520 | if (SCM_INUMP (a->first)) |
ab4f3efb | 521 | { |
bdf8afff | 522 | beg = SCM_INUM (a->first); |
ab4f3efb MD |
523 | end = beg - n + 1; |
524 | if (end < 0) | |
525 | end = 0; | |
526 | } | |
527 | else | |
528 | { | |
529 | beg = n - 1; | |
530 | end = 0; | |
531 | if (beg >= n_frames) | |
532 | beg = n_frames - 1; | |
533 | } | |
534 | n = beg - end + 1; | |
535 | } | |
bdf8afff MD |
536 | SCM_ASSERT (beg >= 0 && beg < n_frames, a->first, SCM_ARG3, s_display_backtrace); |
537 | SCM_ASSERT (n > 0, a->depth, SCM_ARG4, s_display_backtrace); | |
ab4f3efb MD |
538 | |
539 | /* Create a string port used for adaptation of printing parameters. */ | |
540 | sport = scm_mkstrport (SCM_INUM0, | |
541 | scm_make_string (SCM_MAKINUM (240), SCM_UNDEFINED), | |
542 | SCM_OPN | SCM_WRTNG, | |
1bbd0b84 | 543 | FUNC_NAME); |
ab4f3efb MD |
544 | |
545 | /* Create a print state for printing of frames. */ | |
546 | print_state = scm_make_print_state (); | |
547 | pstate = SCM_PRINT_STATE (print_state); | |
548 | pstate->writingp = 1; | |
549 | pstate->fancyp = 1; | |
550 | ||
551 | /* First find out if it's reasonable to do indentation. */ | |
552 | if (SCM_BACKWARDS_P) | |
553 | indent_p = 0; | |
554 | else | |
555 | { | |
556 | indent_p = 1; | |
bdf8afff | 557 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb MD |
558 | for (i = 0, j = 0; i < n; ++i) |
559 | { | |
560 | if (SCM_FRAME_REAL_P (frame)) | |
561 | ++j; | |
562 | if (j > SCM_BACKTRACE_INDENT) | |
563 | { | |
564 | indent_p = 0; | |
565 | break; | |
566 | } | |
567 | frame = (SCM_BACKWARDS_P | |
568 | ? SCM_FRAME_PREV (frame) | |
569 | : SCM_FRAME_NEXT (frame)); | |
570 | } | |
571 | } | |
572 | ||
573 | /* Determine size of frame number field. */ | |
bdf8afff | 574 | j = SCM_FRAME_NUMBER (scm_stack_ref (a->stack, SCM_MAKINUM (end))); |
ab4f3efb MD |
575 | for (i = 0; j > 0; ++i) j /= 10; |
576 | nfield = i ? i : 1; | |
577 | ||
ab4f3efb | 578 | /* Print frames. */ |
bdf8afff | 579 | frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg)); |
ab4f3efb | 580 | indentation = 1; |
bdf8afff | 581 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb MD |
582 | for (i = 1; i < n; ++i) |
583 | { | |
584 | if (indent_p && SCM_FRAME_EVAL_ARGS_P (frame)) | |
585 | ++indentation; | |
586 | frame = SCM_BACKWARDS_P ? SCM_FRAME_PREV (frame) : SCM_FRAME_NEXT (frame); | |
bdf8afff | 587 | display_frame (frame, nfield, indentation, sport, a->port, pstate); |
ab4f3efb | 588 | } |
bdf8afff MD |
589 | |
590 | return SCM_UNSPECIFIED; | |
591 | } | |
1bbd0b84 | 592 | #undef FUNC_NAME |
bdf8afff | 593 | |
3b3b36dd | 594 | SCM_DEFINE (scm_display_backtrace, "display-backtrace", 2, 2, 0, |
1bbd0b84 GB |
595 | (SCM stack, SCM port, SCM first, SCM depth), |
596 | "") | |
597 | #define FUNC_NAME s_scm_display_backtrace | |
bdf8afff | 598 | { |
0b2cb4ee MD |
599 | struct display_backtrace_args a; |
600 | struct display_error_handler_data data; | |
601 | a.stack = stack; | |
602 | a.port = port; | |
603 | a.first = first; | |
604 | a.depth = depth; | |
605 | data.mode = "backtrace"; | |
606 | data.port = port; | |
bdf8afff MD |
607 | scm_internal_catch (SCM_BOOL_T, |
608 | (scm_catch_body_t) display_backtrace_body, &a, | |
609 | (scm_catch_handler_t) display_error_handler, &data); | |
ab4f3efb MD |
610 | return SCM_UNSPECIFIED; |
611 | } | |
1bbd0b84 | 612 | #undef FUNC_NAME |
ab4f3efb | 613 | |
78f9f47b | 614 | SCM_VCELL (scm_has_shown_backtrace_hint_p_var, "has-shown-backtrace-hint?"); |
5aab5d96 | 615 | |
3b3b36dd | 616 | SCM_DEFINE (scm_backtrace, "backtrace", 0, 0, 0, |
1bbd0b84 GB |
617 | (), |
618 | "") | |
619 | #define FUNC_NAME s_scm_backtrace | |
5aab5d96 | 620 | { |
b6609fc7 | 621 | SCM the_last_stack = scm_fluid_ref (SCM_CDR (scm_the_last_stack_fluid)); |
a5d6d578 | 622 | if (SCM_NFALSEP (the_last_stack)) |
5aab5d96 MD |
623 | { |
624 | scm_newline (scm_cur_outp); | |
3a1f8447 | 625 | scm_puts ("Backtrace:\n", scm_cur_outp); |
a5d6d578 | 626 | scm_display_backtrace (the_last_stack, |
5aab5d96 MD |
627 | scm_cur_outp, |
628 | SCM_UNDEFINED, | |
629 | SCM_UNDEFINED); | |
630 | scm_newline (scm_cur_outp); | |
631 | if (SCM_FALSEP (SCM_CDR (scm_has_shown_backtrace_hint_p_var)) | |
632 | && !SCM_BACKTRACE_P) | |
633 | { | |
b7f3516f TT |
634 | scm_puts ("Type \"(debug-enable 'backtrace)\" if you would like " |
635 | "a backtrace\n" | |
636 | "automatically if an error occurs in the future.\n", | |
637 | scm_cur_outp); | |
5aab5d96 MD |
638 | SCM_SETCDR (scm_has_shown_backtrace_hint_p_var, SCM_BOOL_T); |
639 | } | |
640 | } | |
641 | else | |
642 | { | |
b7f3516f | 643 | scm_puts ("No backtrace available.\n", scm_cur_outp); |
5aab5d96 MD |
644 | } |
645 | return SCM_UNSPECIFIED; | |
646 | } | |
1bbd0b84 | 647 | #undef FUNC_NAME |
5aab5d96 | 648 | |
ab4f3efb MD |
649 | \f |
650 | ||
651 | void | |
652 | scm_init_backtrace () | |
653 | { | |
a5d6d578 | 654 | SCM f = scm_make_fluid (); |
b6609fc7 | 655 | scm_the_last_stack_fluid = scm_sysintern ("the-last-stack", f); |
5aab5d96 | 656 | |
8dc9439f | 657 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 658 | #include "libguile/backtrace.x" |
8dc9439f | 659 | #endif |
ab4f3efb | 660 | } |
89e00824 ML |
661 | |
662 | /* | |
663 | Local Variables: | |
664 | c-file-style: "gnu" | |
665 | End: | |
666 | */ |