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