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ed3ef339 DE |
1 | /* GDB/Scheme exception support. |
2 | ||
3 | Copyright (C) 2014 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | /* See README file in this directory for implementation notes, coding | |
21 | conventions, et.al. */ | |
22 | ||
23 | /* Notes: | |
24 | ||
25 | IWBN to support SRFI 34/35. At the moment we follow Guile's own | |
26 | exception mechanism. | |
27 | ||
28 | The non-static functions in this file have prefix gdbscm_ and | |
29 | not exscm_ on purpose. */ | |
30 | ||
31 | #include "defs.h" | |
32 | #include <signal.h> | |
33 | #include "gdb_assert.h" | |
34 | #include "guile-internal.h" | |
35 | ||
36 | /* The <gdb:exception> smob. | |
37 | This is used to record and handle Scheme exceptions. | |
38 | One important invariant is that <gdb:exception> smobs are never a valid | |
39 | result of a function, other than to signify an exception occurred. */ | |
40 | ||
41 | typedef struct | |
42 | { | |
43 | /* This always appears first. */ | |
44 | gdb_smob base; | |
45 | ||
46 | /* The key and args parameters to "throw". */ | |
47 | SCM key; | |
48 | SCM args; | |
49 | } exception_smob; | |
50 | ||
51 | static const char exception_smob_name[] = "gdb:exception"; | |
52 | ||
53 | /* The tag Guile knows the exception smob by. */ | |
54 | static scm_t_bits exception_smob_tag; | |
55 | ||
56 | /* A generic error in struct gdb_exception. | |
57 | I.e., not RETURN_QUIT and not MEMORY_ERROR. */ | |
58 | static SCM error_symbol; | |
59 | ||
60 | /* An error occurred accessing inferior memory. | |
61 | This is not a Scheme programming error. */ | |
62 | static SCM memory_error_symbol; | |
63 | ||
64 | /* User interrupt, e.g., RETURN_QUIT in struct gdb_exception. */ | |
65 | static SCM signal_symbol; | |
66 | ||
e698b8c4 DE |
67 | /* A user error, e.g., bad arg to gdb command. */ |
68 | static SCM user_error_symbol; | |
69 | ||
ed3ef339 DE |
70 | /* Printing the stack is done by first capturing the stack and recording it in |
71 | a <gdb:exception> object with this key and with the ARGS field set to | |
72 | (cons real-key (cons stack real-args)). | |
73 | See gdbscm_make_exception_with_stack. */ | |
74 | static SCM with_stack_error_symbol; | |
75 | ||
76 | /* The key to use for an invalid object exception. An invalid object is one | |
77 | where the underlying object has been removed from GDB. */ | |
78 | SCM gdbscm_invalid_object_error_symbol; | |
79 | ||
80 | /* Values for "guile print-stack" as symbols. */ | |
81 | static SCM none_symbol; | |
82 | static SCM message_symbol; | |
83 | static SCM full_symbol; | |
84 | ||
85 | static const char percent_print_exception_message_name[] = | |
86 | "%print-exception-message"; | |
87 | ||
88 | /* Variable containing %print-exception-message. | |
89 | It is not defined until late in initialization, after our init routine | |
90 | has run. Cope by looking it up lazily. */ | |
91 | static SCM percent_print_exception_message_var = SCM_BOOL_F; | |
92 | ||
93 | static const char percent_print_exception_with_stack_name[] = | |
94 | "%print-exception-with-stack"; | |
95 | ||
96 | /* Variable containing %print-exception-with-stack. | |
97 | It is not defined until late in initialization, after our init routine | |
98 | has run. Cope by looking it up lazily. */ | |
99 | static SCM percent_print_exception_with_stack_var = SCM_BOOL_F; | |
100 | ||
101 | /* Counter to keep track of the number of times we create a <gdb:exception> | |
102 | object, for performance monitoring purposes. */ | |
103 | static unsigned long gdbscm_exception_count = 0; | |
104 | \f | |
105 | /* Administrivia for exception smobs. */ | |
106 | ||
ed3ef339 DE |
107 | /* The smob "print" function for <gdb:exception>. */ |
108 | ||
109 | static int | |
110 | exscm_print_exception_smob (SCM self, SCM port, scm_print_state *pstate) | |
111 | { | |
112 | exception_smob *e_smob = (exception_smob *) SCM_SMOB_DATA (self); | |
113 | ||
114 | gdbscm_printf (port, "#<%s ", exception_smob_name); | |
115 | scm_write (e_smob->key, port); | |
116 | scm_puts (" ", port); | |
117 | scm_write (e_smob->args, port); | |
118 | scm_puts (">", port); | |
119 | ||
120 | scm_remember_upto_here_1 (self); | |
121 | ||
122 | /* Non-zero means success. */ | |
123 | return 1; | |
124 | } | |
125 | ||
126 | /* (make-exception key args) -> <gdb:exception> */ | |
127 | ||
128 | SCM | |
129 | gdbscm_make_exception (SCM key, SCM args) | |
130 | { | |
131 | exception_smob *e_smob = (exception_smob *) | |
132 | scm_gc_malloc (sizeof (exception_smob), exception_smob_name); | |
133 | SCM smob; | |
134 | ||
135 | e_smob->key = key; | |
136 | e_smob->args = args; | |
137 | smob = scm_new_smob (exception_smob_tag, (scm_t_bits) e_smob); | |
138 | gdbscm_init_gsmob (&e_smob->base); | |
139 | ||
140 | ++gdbscm_exception_count; | |
141 | ||
142 | return smob; | |
143 | } | |
144 | ||
145 | /* Return non-zero if SCM is a <gdb:exception> object. */ | |
146 | ||
147 | int | |
148 | gdbscm_is_exception (SCM scm) | |
149 | { | |
150 | return SCM_SMOB_PREDICATE (exception_smob_tag, scm); | |
151 | } | |
152 | ||
153 | /* (exception? scm) -> boolean */ | |
154 | ||
155 | static SCM | |
156 | gdbscm_exception_p (SCM scm) | |
157 | { | |
158 | return scm_from_bool (gdbscm_is_exception (scm)); | |
159 | } | |
160 | ||
161 | /* (exception-key <gdb:exception>) -> key */ | |
162 | ||
163 | SCM | |
164 | gdbscm_exception_key (SCM self) | |
165 | { | |
166 | exception_smob *e_smob; | |
167 | ||
168 | SCM_ASSERT_TYPE (gdbscm_is_exception (self), self, SCM_ARG1, FUNC_NAME, | |
169 | "gdb:exception"); | |
170 | ||
171 | e_smob = (exception_smob *) SCM_SMOB_DATA (self); | |
172 | return e_smob->key; | |
173 | } | |
174 | ||
175 | /* (exception-args <gdb:exception>) -> arg-list */ | |
176 | ||
177 | SCM | |
178 | gdbscm_exception_args (SCM self) | |
179 | { | |
180 | exception_smob *e_smob; | |
181 | ||
182 | SCM_ASSERT_TYPE (gdbscm_is_exception (self), self, SCM_ARG1, FUNC_NAME, | |
183 | "gdb:exception"); | |
184 | ||
185 | e_smob = (exception_smob *) SCM_SMOB_DATA (self); | |
186 | return e_smob->args; | |
187 | } | |
188 | \f | |
189 | /* Wrap an exception in a <gdb:exception> object that includes STACK. | |
190 | gdbscm_print_exception_with_stack knows how to unwrap it. */ | |
191 | ||
192 | SCM | |
193 | gdbscm_make_exception_with_stack (SCM key, SCM args, SCM stack) | |
194 | { | |
195 | return gdbscm_make_exception (with_stack_error_symbol, | |
196 | scm_cons (key, scm_cons (stack, args))); | |
197 | } | |
198 | ||
199 | /* Version of scm_error_scm that creates a gdb:exception object that can later | |
200 | be passed to gdbscm_throw. | |
201 | KEY is a symbol denoting the kind of error. | |
202 | SUBR is either #f or a string marking the function in which the error | |
203 | occurred. | |
204 | MESSAGE is either #f or the error message string. It may contain ~a and ~s | |
205 | modifiers, provided by ARGS. | |
206 | ARGS is a list of args to MESSAGE. | |
207 | DATA is an arbitrary object, its value depends on KEY. The value to pass | |
208 | here is a bit underspecified by Guile. */ | |
209 | ||
210 | SCM | |
211 | gdbscm_make_error_scm (SCM key, SCM subr, SCM message, SCM args, SCM data) | |
212 | { | |
213 | return gdbscm_make_exception (key, scm_list_4 (subr, message, args, data)); | |
214 | } | |
215 | ||
216 | /* Version of scm_error that creates a gdb:exception object that can later | |
217 | be passed to gdbscm_throw. | |
218 | See gdbscm_make_error_scm for a description of the arguments. */ | |
219 | ||
220 | SCM | |
221 | gdbscm_make_error (SCM key, const char *subr, const char *message, | |
222 | SCM args, SCM data) | |
223 | { | |
224 | return gdbscm_make_error_scm | |
225 | (key, | |
226 | subr == NULL ? SCM_BOOL_F : scm_from_latin1_string (subr), | |
227 | message == NULL ? SCM_BOOL_F : scm_from_latin1_string (message), | |
228 | args, data); | |
229 | } | |
230 | ||
231 | /* Version of SCM_ASSERT_TYPE/scm_wrong_type_arg_msg that creates a | |
232 | gdb:exception object that can later be passed to gdbscm_throw. */ | |
233 | ||
234 | SCM | |
235 | gdbscm_make_type_error (const char *subr, int arg_pos, SCM bad_value, | |
236 | const char *expected_type) | |
237 | { | |
238 | char *msg; | |
239 | SCM result; | |
240 | ||
241 | if (arg_pos > 0) | |
242 | { | |
243 | if (expected_type != NULL) | |
244 | { | |
245 | msg = xstrprintf (_("Wrong type argument in position %d" | |
246 | " (expecting %s): ~S"), | |
247 | arg_pos, expected_type); | |
248 | } | |
249 | else | |
250 | { | |
251 | msg = xstrprintf (_("Wrong type argument in position %d: ~S"), | |
252 | arg_pos); | |
253 | } | |
254 | } | |
255 | else | |
256 | { | |
257 | if (expected_type != NULL) | |
258 | { | |
259 | msg = xstrprintf (_("Wrong type argument (expecting %s): ~S"), | |
260 | expected_type); | |
261 | } | |
262 | else | |
263 | msg = xstrprintf (_("Wrong type argument: ~S")); | |
264 | } | |
265 | ||
266 | result = gdbscm_make_error (scm_arg_type_key, subr, msg, | |
267 | scm_list_1 (bad_value), scm_list_1 (bad_value)); | |
268 | xfree (msg); | |
269 | return result; | |
270 | } | |
271 | ||
272 | /* A variant of gdbscm_make_type_error for non-type argument errors. | |
273 | ERROR_PREFIX and ERROR are combined to build the error message. | |
274 | Care needs to be taken so that the i18n composed form is still | |
275 | reasonable, but no one is going to translate these anyway so we don't | |
276 | worry too much. | |
277 | ERROR_PREFIX may be NULL, ERROR may not be NULL. */ | |
278 | ||
279 | static SCM | |
280 | gdbscm_make_arg_error (SCM key, const char *subr, int arg_pos, SCM bad_value, | |
281 | const char *error_prefix, const char *error) | |
282 | { | |
283 | char *msg; | |
284 | SCM result; | |
285 | ||
286 | if (error_prefix != NULL) | |
287 | { | |
288 | if (arg_pos > 0) | |
289 | { | |
290 | msg = xstrprintf (_("%s %s in position %d: ~S"), | |
291 | error_prefix, error, arg_pos); | |
292 | } | |
293 | else | |
294 | msg = xstrprintf (_("%s %s: ~S"), error_prefix, error); | |
295 | } | |
296 | else | |
297 | { | |
298 | if (arg_pos > 0) | |
299 | msg = xstrprintf (_("%s in position %d: ~S"), error, arg_pos); | |
300 | else | |
301 | msg = xstrprintf (_("%s: ~S"), error); | |
302 | } | |
303 | ||
304 | result = gdbscm_make_error (key, subr, msg, | |
305 | scm_list_1 (bad_value), scm_list_1 (bad_value)); | |
306 | xfree (msg); | |
307 | return result; | |
308 | } | |
309 | ||
310 | /* Make an invalid-object error <gdb:exception> object. | |
311 | OBJECT is the name of the kind of object that is invalid. */ | |
312 | ||
313 | SCM | |
314 | gdbscm_make_invalid_object_error (const char *subr, int arg_pos, SCM bad_value, | |
315 | const char *object) | |
316 | { | |
317 | return gdbscm_make_arg_error (gdbscm_invalid_object_error_symbol, | |
318 | subr, arg_pos, bad_value, | |
319 | _("Invalid object:"), object); | |
320 | } | |
321 | ||
322 | /* Throw an invalid-object error. | |
323 | OBJECT is the name of the kind of object that is invalid. */ | |
324 | ||
4a2722c5 | 325 | void |
ed3ef339 DE |
326 | gdbscm_invalid_object_error (const char *subr, int arg_pos, SCM bad_value, |
327 | const char *object) | |
328 | { | |
329 | SCM exception | |
330 | = gdbscm_make_invalid_object_error (subr, arg_pos, bad_value, object); | |
331 | ||
332 | gdbscm_throw (exception); | |
333 | } | |
334 | ||
335 | /* Make an out-of-range error <gdb:exception> object. */ | |
336 | ||
337 | SCM | |
338 | gdbscm_make_out_of_range_error (const char *subr, int arg_pos, SCM bad_value, | |
339 | const char *error) | |
340 | { | |
341 | return gdbscm_make_arg_error (scm_out_of_range_key, | |
342 | subr, arg_pos, bad_value, | |
343 | _("Out of range:"), error); | |
344 | } | |
345 | ||
346 | /* Throw an out-of-range error. | |
347 | This is the standard Guile out-of-range exception. */ | |
348 | ||
4a2722c5 | 349 | void |
ed3ef339 DE |
350 | gdbscm_out_of_range_error (const char *subr, int arg_pos, SCM bad_value, |
351 | const char *error) | |
352 | { | |
353 | SCM exception | |
354 | = gdbscm_make_out_of_range_error (subr, arg_pos, bad_value, error); | |
355 | ||
356 | gdbscm_throw (exception); | |
357 | } | |
358 | ||
359 | /* Make a misc-error <gdb:exception> object. */ | |
360 | ||
361 | SCM | |
362 | gdbscm_make_misc_error (const char *subr, int arg_pos, SCM bad_value, | |
06eb1586 | 363 | const char *error) |
ed3ef339 DE |
364 | { |
365 | return gdbscm_make_arg_error (scm_misc_error_key, | |
366 | subr, arg_pos, bad_value, NULL, error); | |
367 | } | |
368 | ||
06eb1586 DE |
369 | /* Throw a misc-error error. */ |
370 | ||
371 | void | |
372 | gdbscm_misc_error (const char *subr, int arg_pos, SCM bad_value, | |
373 | const char *error) | |
374 | { | |
375 | SCM exception = gdbscm_make_misc_error (subr, arg_pos, bad_value, error); | |
376 | ||
377 | gdbscm_throw (exception); | |
378 | } | |
379 | ||
ed3ef339 DE |
380 | /* Return a <gdb:exception> object for gdb:memory-error. */ |
381 | ||
382 | SCM | |
383 | gdbscm_make_memory_error (const char *subr, const char *msg, SCM args) | |
384 | { | |
385 | return gdbscm_make_error (memory_error_symbol, subr, msg, args, | |
386 | SCM_EOL); | |
387 | } | |
388 | ||
389 | /* Throw a gdb:memory-error exception. */ | |
390 | ||
4a2722c5 | 391 | void |
ed3ef339 DE |
392 | gdbscm_memory_error (const char *subr, const char *msg, SCM args) |
393 | { | |
394 | SCM exception = gdbscm_make_memory_error (subr, msg, args); | |
395 | ||
396 | gdbscm_throw (exception); | |
397 | } | |
398 | ||
399 | /* Return non-zero if KEY is gdb:memory-error. | |
400 | Note: This is an excp_matcher_func function. */ | |
401 | ||
402 | int | |
403 | gdbscm_memory_error_p (SCM key) | |
404 | { | |
405 | return scm_is_eq (key, memory_error_symbol); | |
406 | } | |
407 | ||
e698b8c4 DE |
408 | /* Return non-zero if KEY is gdb:user-error. |
409 | Note: This is an excp_matcher_func function. */ | |
410 | ||
411 | int | |
412 | gdbscm_user_error_p (SCM key) | |
413 | { | |
414 | return scm_is_eq (key, user_error_symbol); | |
415 | } | |
416 | ||
ed3ef339 DE |
417 | /* Wrapper around scm_throw to throw a gdb:exception. |
418 | This function does not return. | |
419 | This function cannot be called from inside TRY_CATCH. */ | |
420 | ||
421 | void | |
422 | gdbscm_throw (SCM exception) | |
423 | { | |
424 | scm_throw (gdbscm_exception_key (exception), | |
425 | gdbscm_exception_args (exception)); | |
426 | gdb_assert_not_reached ("scm_throw returned"); | |
427 | } | |
428 | ||
429 | /* Convert a GDB exception to a <gdb:exception> object. */ | |
430 | ||
431 | SCM | |
432 | gdbscm_scm_from_gdb_exception (struct gdb_exception exception) | |
433 | { | |
434 | SCM key; | |
435 | ||
436 | if (exception.reason == RETURN_QUIT) | |
437 | { | |
438 | /* Handle this specially to be consistent with top-repl.scm. */ | |
439 | return gdbscm_make_error (signal_symbol, NULL, _("User interrupt"), | |
440 | SCM_EOL, scm_list_1 (scm_from_int (SIGINT))); | |
441 | } | |
442 | ||
443 | if (exception.error == MEMORY_ERROR) | |
444 | key = memory_error_symbol; | |
445 | else | |
446 | key = error_symbol; | |
447 | ||
448 | return gdbscm_make_error (key, NULL, "~A", | |
449 | scm_list_1 (gdbscm_scm_from_c_string | |
450 | (exception.message)), | |
451 | SCM_BOOL_F); | |
452 | } | |
453 | ||
454 | /* Convert a GDB exception to the appropriate Scheme exception and throw it. | |
455 | This function does not return. */ | |
456 | ||
457 | void | |
458 | gdbscm_throw_gdb_exception (struct gdb_exception exception) | |
459 | { | |
460 | gdbscm_throw (gdbscm_scm_from_gdb_exception (exception)); | |
461 | } | |
462 | ||
463 | /* Print the error message portion of an exception. | |
464 | If PORT is #f, use the standard error port. | |
465 | KEY cannot be gdb:with-stack. | |
466 | ||
467 | Basically this function is just a wrapper around calling | |
468 | %print-exception-message. */ | |
469 | ||
470 | static void | |
471 | gdbscm_print_exception_message (SCM port, SCM frame, SCM key, SCM args) | |
472 | { | |
473 | SCM printer, status; | |
474 | ||
475 | if (gdbscm_is_false (port)) | |
476 | port = scm_current_error_port (); | |
477 | ||
478 | gdb_assert (!scm_is_eq (key, with_stack_error_symbol)); | |
479 | ||
480 | /* This does not use scm_print_exception because we tweak the output a bit. | |
481 | Compare Guile's print-exception with our %print-exception-message for | |
482 | details. */ | |
483 | if (gdbscm_is_false (percent_print_exception_message_var)) | |
484 | { | |
485 | percent_print_exception_message_var | |
486 | = scm_c_private_variable (gdbscm_init_module_name, | |
487 | percent_print_exception_message_name); | |
488 | /* If we can't find %print-exception-message, there's a problem on the | |
489 | Scheme side. Don't kill GDB, just flag an error and leave it at | |
490 | that. */ | |
491 | if (gdbscm_is_false (percent_print_exception_message_var)) | |
492 | { | |
493 | gdbscm_printf (port, _("Error in Scheme exception printing," | |
494 | " can't find %s.\n"), | |
495 | percent_print_exception_message_name); | |
496 | return; | |
497 | } | |
498 | } | |
499 | printer = scm_variable_ref (percent_print_exception_message_var); | |
500 | ||
501 | status = gdbscm_safe_call_4 (printer, port, frame, key, args, NULL); | |
502 | ||
503 | /* If that failed still tell the user something. | |
504 | But don't use the exception printing machinery! */ | |
505 | if (gdbscm_is_exception (status)) | |
506 | { | |
507 | gdbscm_printf (port, _("Error in Scheme exception printing:\n")); | |
508 | scm_display (status, port); | |
509 | scm_newline (port); | |
510 | } | |
511 | } | |
512 | ||
513 | /* Print the description of exception KEY, ARGS to PORT, according to the | |
514 | setting of "set guile print-stack". | |
515 | If PORT is #f, use the standard error port. | |
516 | If STACK is #f, never print the stack, regardless of whether printing it | |
517 | is enabled. If STACK is #t, then print it if it is contained in ARGS | |
518 | (i.e., KEY is gdb:with-stack). Otherwise STACK is the result of calling | |
519 | scm_make_stack (which will be ignored in favor of the stack in ARGS if | |
520 | KEY is gdb:with-stack). | |
521 | KEY, ARGS are the standard arguments to scm_throw, et.al. | |
522 | ||
523 | Basically this function is just a wrapper around calling | |
524 | %print-exception-with-args. */ | |
525 | ||
526 | void | |
527 | gdbscm_print_exception_with_stack (SCM port, SCM stack, SCM key, SCM args) | |
528 | { | |
529 | SCM printer, status; | |
530 | ||
531 | if (gdbscm_is_false (port)) | |
532 | port = scm_current_error_port (); | |
533 | ||
534 | if (gdbscm_is_false (percent_print_exception_with_stack_var)) | |
535 | { | |
536 | percent_print_exception_with_stack_var | |
537 | = scm_c_private_variable (gdbscm_init_module_name, | |
538 | percent_print_exception_with_stack_name); | |
539 | /* If we can't find %print-exception-with-args, there's a problem on the | |
540 | Scheme side. Don't kill GDB, just flag an error and leave it at | |
541 | that. */ | |
542 | if (gdbscm_is_false (percent_print_exception_with_stack_var)) | |
543 | { | |
544 | gdbscm_printf (port, _("Error in Scheme exception printing," | |
545 | " can't find %s.\n"), | |
546 | percent_print_exception_with_stack_name); | |
547 | return; | |
548 | } | |
549 | } | |
550 | printer = scm_variable_ref (percent_print_exception_with_stack_var); | |
551 | ||
552 | status = gdbscm_safe_call_4 (printer, port, stack, key, args, NULL); | |
553 | ||
554 | /* If that failed still tell the user something. | |
555 | But don't use the exception printing machinery! */ | |
556 | if (gdbscm_is_exception (status)) | |
557 | { | |
558 | gdbscm_printf (port, _("Error in Scheme exception printing:\n")); | |
559 | scm_display (status, port); | |
560 | scm_newline (port); | |
561 | } | |
562 | } | |
563 | ||
564 | /* Print EXCEPTION, a <gdb:exception> object, to PORT. | |
565 | If PORT is #f, use the standard error port. */ | |
566 | ||
567 | void | |
568 | gdbscm_print_gdb_exception (SCM port, SCM exception) | |
569 | { | |
570 | gdb_assert (gdbscm_is_exception (exception)); | |
571 | ||
572 | gdbscm_print_exception_with_stack (port, SCM_BOOL_T, | |
573 | gdbscm_exception_key (exception), | |
574 | gdbscm_exception_args (exception)); | |
575 | } | |
576 | ||
577 | /* Return a string description of <gdb:exception> EXCEPTION. | |
578 | If EXCEPTION is a gdb:with-stack exception, unwrap it, a backtrace | |
579 | is never returned as part of the result. | |
580 | ||
581 | Space for the result is malloc'd, the caller must free. */ | |
582 | ||
583 | char * | |
584 | gdbscm_exception_message_to_string (SCM exception) | |
585 | { | |
586 | SCM port = scm_open_output_string (); | |
587 | SCM key, args; | |
588 | char *result; | |
589 | ||
590 | gdb_assert (gdbscm_is_exception (exception)); | |
591 | ||
592 | key = gdbscm_exception_key (exception); | |
593 | args = gdbscm_exception_args (exception); | |
594 | ||
595 | if (scm_is_eq (key, with_stack_error_symbol) | |
596 | /* Don't crash on a badly generated gdb:with-stack exception. */ | |
597 | && scm_is_pair (args) | |
598 | && scm_is_pair (scm_cdr (args))) | |
599 | { | |
600 | key = scm_car (args); | |
601 | args = scm_cddr (args); | |
602 | } | |
603 | ||
604 | gdbscm_print_exception_message (port, SCM_BOOL_F, key, args); | |
605 | result = gdbscm_scm_to_c_string (scm_get_output_string (port)); | |
606 | scm_close_port (port); | |
607 | ||
608 | return result; | |
609 | } | |
610 | ||
611 | /* Return the value of the "guile print-stack" option as one of: | |
612 | 'none, 'message, 'full. */ | |
613 | ||
614 | static SCM | |
615 | gdbscm_percent_exception_print_style (void) | |
616 | { | |
617 | if (gdbscm_print_excp == gdbscm_print_excp_none) | |
618 | return none_symbol; | |
619 | if (gdbscm_print_excp == gdbscm_print_excp_message) | |
620 | return message_symbol; | |
621 | if (gdbscm_print_excp == gdbscm_print_excp_full) | |
622 | return full_symbol; | |
623 | gdb_assert_not_reached ("bad value for \"guile print-stack\""); | |
624 | } | |
625 | ||
626 | /* Return the current <gdb:exception> counter. | |
627 | This is for debugging purposes. */ | |
628 | ||
629 | static SCM | |
630 | gdbscm_percent_exception_count (void) | |
631 | { | |
632 | return scm_from_ulong (gdbscm_exception_count); | |
633 | } | |
634 | \f | |
635 | /* Initialize the Scheme exception support. */ | |
636 | ||
637 | static const scheme_function exception_functions[] = | |
638 | { | |
639 | { "make-exception", 2, 0, 0, gdbscm_make_exception, | |
640 | "\ | |
641 | Create a <gdb:exception> object.\n\ | |
642 | \n\ | |
643 | Arguments: key args\n\ | |
644 | These are the standard key,args arguments of \"throw\"." }, | |
645 | ||
646 | { "exception?", 1, 0, 0, gdbscm_exception_p, | |
647 | "\ | |
648 | Return #t if the object is a <gdb:exception> object." }, | |
649 | ||
650 | { "exception-key", 1, 0, 0, gdbscm_exception_key, | |
651 | "\ | |
652 | Return the exception's key." }, | |
653 | ||
654 | { "exception-args", 1, 0, 0, gdbscm_exception_args, | |
655 | "\ | |
656 | Return the exception's arg list." }, | |
657 | ||
658 | END_FUNCTIONS | |
659 | }; | |
660 | ||
661 | static const scheme_function private_exception_functions[] = | |
662 | { | |
663 | { "%exception-print-style", 0, 0, 0, gdbscm_percent_exception_print_style, | |
664 | "\ | |
665 | Return the value of the \"guile print-stack\" option." }, | |
666 | ||
667 | { "%exception-count", 0, 0, 0, gdbscm_percent_exception_count, | |
668 | "\ | |
669 | Return a count of the number of <gdb:exception> objects created.\n\ | |
670 | This is for debugging purposes." }, | |
671 | ||
672 | END_FUNCTIONS | |
673 | }; | |
674 | ||
675 | void | |
676 | gdbscm_initialize_exceptions (void) | |
677 | { | |
678 | exception_smob_tag = gdbscm_make_smob_type (exception_smob_name, | |
679 | sizeof (exception_smob)); | |
ed3ef339 DE |
680 | scm_set_smob_print (exception_smob_tag, exscm_print_exception_smob); |
681 | ||
682 | gdbscm_define_functions (exception_functions, 1); | |
683 | gdbscm_define_functions (private_exception_functions, 0); | |
684 | ||
685 | error_symbol = scm_from_latin1_symbol ("gdb:error"); | |
686 | ||
687 | memory_error_symbol = scm_from_latin1_symbol ("gdb:memory-error"); | |
688 | ||
e698b8c4 DE |
689 | user_error_symbol = scm_from_latin1_symbol ("gdb:user-error"); |
690 | ||
ed3ef339 DE |
691 | gdbscm_invalid_object_error_symbol |
692 | = scm_from_latin1_symbol ("gdb:invalid-object-error"); | |
693 | ||
694 | with_stack_error_symbol = scm_from_latin1_symbol ("gdb:with-stack"); | |
695 | ||
696 | /* The text of this symbol is taken from Guile's top-repl.scm. */ | |
697 | signal_symbol = scm_from_latin1_symbol ("signal"); | |
698 | ||
699 | none_symbol = scm_from_latin1_symbol ("none"); | |
700 | message_symbol = scm_from_latin1_symbol ("message"); | |
701 | full_symbol = scm_from_latin1_symbol ("full"); | |
702 | } |