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ed3ef339 DE |
1 | /* Scheme interface to symbols. |
2 | ||
3 | Copyright (C) 2008-2014 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 | #include "defs.h" | |
24 | #include "block.h" | |
25 | #include "exceptions.h" | |
26 | #include "frame.h" | |
27 | #include "symtab.h" | |
28 | #include "objfiles.h" | |
29 | #include "value.h" | |
30 | #include "guile-internal.h" | |
31 | ||
32 | /* The <gdb:symbol> smob. */ | |
33 | ||
34 | typedef struct | |
35 | { | |
36 | /* This always appears first. */ | |
37 | eqable_gdb_smob base; | |
38 | ||
39 | /* The GDB symbol structure this smob is wrapping. */ | |
40 | struct symbol *symbol; | |
41 | } symbol_smob; | |
42 | ||
43 | static const char symbol_smob_name[] = "gdb:symbol"; | |
44 | ||
45 | /* The tag Guile knows the symbol smob by. */ | |
46 | static scm_t_bits symbol_smob_tag; | |
47 | ||
48 | /* Keywords used in argument passing. */ | |
49 | static SCM block_keyword; | |
50 | static SCM domain_keyword; | |
51 | static SCM frame_keyword; | |
52 | ||
53 | static const struct objfile_data *syscm_objfile_data_key; | |
54 | \f | |
55 | /* Administrivia for symbol smobs. */ | |
56 | ||
57 | /* Helper function to hash a symbol_smob. */ | |
58 | ||
59 | static hashval_t | |
60 | syscm_hash_symbol_smob (const void *p) | |
61 | { | |
62 | const symbol_smob *s_smob = p; | |
63 | ||
64 | return htab_hash_pointer (s_smob->symbol); | |
65 | } | |
66 | ||
67 | /* Helper function to compute equality of symbol_smobs. */ | |
68 | ||
69 | static int | |
70 | syscm_eq_symbol_smob (const void *ap, const void *bp) | |
71 | { | |
72 | const symbol_smob *a = ap; | |
73 | const symbol_smob *b = bp; | |
74 | ||
75 | return (a->symbol == b->symbol | |
76 | && a->symbol != NULL); | |
77 | } | |
78 | ||
79 | /* Return the struct symbol pointer -> SCM mapping table. | |
80 | It is created if necessary. */ | |
81 | ||
82 | static htab_t | |
83 | syscm_objfile_symbol_map (struct symbol *symbol) | |
84 | { | |
85 | struct objfile *objfile = SYMBOL_SYMTAB (symbol)->objfile; | |
86 | htab_t htab = objfile_data (objfile, syscm_objfile_data_key); | |
87 | ||
88 | if (htab == NULL) | |
89 | { | |
90 | htab = gdbscm_create_eqable_gsmob_ptr_map (syscm_hash_symbol_smob, | |
91 | syscm_eq_symbol_smob); | |
92 | set_objfile_data (objfile, syscm_objfile_data_key, htab); | |
93 | } | |
94 | ||
95 | return htab; | |
96 | } | |
97 | ||
ed3ef339 DE |
98 | /* The smob "free" function for <gdb:symbol>. */ |
99 | ||
100 | static size_t | |
101 | syscm_free_symbol_smob (SCM self) | |
102 | { | |
103 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (self); | |
104 | ||
105 | if (s_smob->symbol != NULL) | |
106 | { | |
107 | htab_t htab = syscm_objfile_symbol_map (s_smob->symbol); | |
108 | ||
109 | gdbscm_clear_eqable_gsmob_ptr_slot (htab, &s_smob->base); | |
110 | } | |
111 | ||
112 | /* Not necessary, done to catch bugs. */ | |
113 | s_smob->symbol = NULL; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | /* The smob "print" function for <gdb:symbol>. */ | |
119 | ||
120 | static int | |
121 | syscm_print_symbol_smob (SCM self, SCM port, scm_print_state *pstate) | |
122 | { | |
123 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (self); | |
124 | ||
125 | if (pstate->writingp) | |
126 | gdbscm_printf (port, "#<%s ", symbol_smob_name); | |
127 | gdbscm_printf (port, "%s", | |
128 | s_smob->symbol != NULL | |
129 | ? SYMBOL_PRINT_NAME (s_smob->symbol) | |
130 | : "<invalid>"); | |
131 | if (pstate->writingp) | |
132 | scm_puts (">", port); | |
133 | ||
134 | scm_remember_upto_here_1 (self); | |
135 | ||
136 | /* Non-zero means success. */ | |
137 | return 1; | |
138 | } | |
139 | ||
140 | /* Low level routine to create a <gdb:symbol> object. */ | |
141 | ||
142 | static SCM | |
143 | syscm_make_symbol_smob (void) | |
144 | { | |
145 | symbol_smob *s_smob = (symbol_smob *) | |
146 | scm_gc_malloc (sizeof (symbol_smob), symbol_smob_name); | |
147 | SCM s_scm; | |
148 | ||
149 | s_smob->symbol = NULL; | |
150 | s_scm = scm_new_smob (symbol_smob_tag, (scm_t_bits) s_smob); | |
1254eefc | 151 | gdbscm_init_eqable_gsmob (&s_smob->base, s_scm); |
ed3ef339 DE |
152 | |
153 | return s_scm; | |
154 | } | |
155 | ||
156 | /* Return non-zero if SCM is a symbol smob. */ | |
157 | ||
158 | int | |
159 | syscm_is_symbol (SCM scm) | |
160 | { | |
161 | return SCM_SMOB_PREDICATE (symbol_smob_tag, scm); | |
162 | } | |
163 | ||
164 | /* (symbol? object) -> boolean */ | |
165 | ||
166 | static SCM | |
167 | gdbscm_symbol_p (SCM scm) | |
168 | { | |
169 | return scm_from_bool (syscm_is_symbol (scm)); | |
170 | } | |
171 | ||
172 | /* Return the existing object that encapsulates SYMBOL, or create a new | |
173 | <gdb:symbol> object. */ | |
174 | ||
175 | SCM | |
176 | syscm_scm_from_symbol (struct symbol *symbol) | |
177 | { | |
178 | htab_t htab; | |
179 | eqable_gdb_smob **slot; | |
180 | symbol_smob *s_smob, s_smob_for_lookup; | |
181 | SCM s_scm; | |
182 | ||
183 | /* If we've already created a gsmob for this symbol, return it. | |
184 | This makes symbols eq?-able. */ | |
185 | htab = syscm_objfile_symbol_map (symbol); | |
186 | s_smob_for_lookup.symbol = symbol; | |
187 | slot = gdbscm_find_eqable_gsmob_ptr_slot (htab, &s_smob_for_lookup.base); | |
188 | if (*slot != NULL) | |
189 | return (*slot)->containing_scm; | |
190 | ||
191 | s_scm = syscm_make_symbol_smob (); | |
192 | s_smob = (symbol_smob *) SCM_SMOB_DATA (s_scm); | |
193 | s_smob->symbol = symbol; | |
1254eefc | 194 | gdbscm_fill_eqable_gsmob_ptr_slot (slot, &s_smob->base); |
ed3ef339 DE |
195 | |
196 | return s_scm; | |
197 | } | |
198 | ||
199 | /* Returns the <gdb:symbol> object in SELF. | |
200 | Throws an exception if SELF is not a <gdb:symbol> object. */ | |
201 | ||
202 | static SCM | |
203 | syscm_get_symbol_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
204 | { | |
205 | SCM_ASSERT_TYPE (syscm_is_symbol (self), self, arg_pos, func_name, | |
206 | symbol_smob_name); | |
207 | ||
208 | return self; | |
209 | } | |
210 | ||
211 | /* Returns a pointer to the symbol smob of SELF. | |
212 | Throws an exception if SELF is not a <gdb:symbol> object. */ | |
213 | ||
214 | static symbol_smob * | |
215 | syscm_get_symbol_smob_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
216 | { | |
217 | SCM s_scm = syscm_get_symbol_arg_unsafe (self, arg_pos, func_name); | |
218 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (s_scm); | |
219 | ||
220 | return s_smob; | |
221 | } | |
222 | ||
223 | /* Return non-zero if symbol S_SMOB is valid. */ | |
224 | ||
225 | static int | |
226 | syscm_is_valid (symbol_smob *s_smob) | |
227 | { | |
228 | return s_smob->symbol != NULL; | |
229 | } | |
230 | ||
231 | /* Throw a Scheme error if SELF is not a valid symbol smob. | |
232 | Otherwise return a pointer to the symbol smob. */ | |
233 | ||
234 | static symbol_smob * | |
235 | syscm_get_valid_symbol_smob_arg_unsafe (SCM self, int arg_pos, | |
236 | const char *func_name) | |
237 | { | |
238 | symbol_smob *s_smob | |
239 | = syscm_get_symbol_smob_arg_unsafe (self, arg_pos, func_name); | |
240 | ||
241 | if (!syscm_is_valid (s_smob)) | |
242 | { | |
243 | gdbscm_invalid_object_error (func_name, arg_pos, self, | |
244 | _("<gdb:symbol>")); | |
245 | } | |
246 | ||
247 | return s_smob; | |
248 | } | |
249 | ||
250 | /* Throw a Scheme error if SELF is not a valid symbol smob. | |
251 | Otherwise return a pointer to the symbol struct. */ | |
252 | ||
253 | struct symbol * | |
254 | syscm_get_valid_symbol_arg_unsafe (SCM self, int arg_pos, | |
255 | const char *func_name) | |
256 | { | |
257 | symbol_smob *s_smob = syscm_get_valid_symbol_smob_arg_unsafe (self, arg_pos, | |
258 | func_name); | |
259 | ||
260 | return s_smob->symbol; | |
261 | } | |
262 | ||
263 | /* Helper function for syscm_del_objfile_symbols to mark the symbol | |
264 | as invalid. */ | |
265 | ||
266 | static int | |
267 | syscm_mark_symbol_invalid (void **slot, void *info) | |
268 | { | |
269 | symbol_smob *s_smob = (symbol_smob *) *slot; | |
270 | ||
271 | s_smob->symbol = NULL; | |
272 | return 1; | |
273 | } | |
274 | ||
275 | /* This function is called when an objfile is about to be freed. | |
276 | Invalidate the symbol as further actions on the symbol would result | |
277 | in bad data. All access to s_smob->symbol should be gated by | |
278 | syscm_get_valid_symbol_smob_arg_unsafe which will raise an exception on | |
279 | invalid symbols. */ | |
280 | ||
281 | static void | |
282 | syscm_del_objfile_symbols (struct objfile *objfile, void *datum) | |
283 | { | |
284 | htab_t htab = datum; | |
285 | ||
286 | if (htab != NULL) | |
287 | { | |
288 | htab_traverse_noresize (htab, syscm_mark_symbol_invalid, NULL); | |
289 | htab_delete (htab); | |
290 | } | |
291 | } | |
292 | \f | |
293 | /* Symbol methods. */ | |
294 | ||
295 | /* (symbol-valid? <gdb:symbol>) -> boolean | |
296 | Returns #t if SELF still exists in GDB. */ | |
297 | ||
298 | static SCM | |
299 | gdbscm_symbol_valid_p (SCM self) | |
300 | { | |
301 | symbol_smob *s_smob | |
302 | = syscm_get_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
303 | ||
304 | return scm_from_bool (syscm_is_valid (s_smob)); | |
305 | } | |
306 | ||
307 | /* (symbol-type <gdb:symbol>) -> <gdb:type> | |
308 | Return the type of SELF, or #f if SELF has no type. */ | |
309 | ||
310 | static SCM | |
311 | gdbscm_symbol_type (SCM self) | |
312 | { | |
313 | symbol_smob *s_smob | |
314 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
315 | const struct symbol *symbol = s_smob->symbol; | |
316 | ||
317 | if (SYMBOL_TYPE (symbol) == NULL) | |
318 | return SCM_BOOL_F; | |
319 | ||
320 | return tyscm_scm_from_type (SYMBOL_TYPE (symbol)); | |
321 | } | |
322 | ||
323 | /* (symbol-symtab <gdb:symbol>) -> <gdb:symtab> | |
324 | Return the symbol table of SELF. */ | |
325 | ||
326 | static SCM | |
327 | gdbscm_symbol_symtab (SCM self) | |
328 | { | |
329 | symbol_smob *s_smob | |
330 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
331 | const struct symbol *symbol = s_smob->symbol; | |
332 | ||
333 | return stscm_scm_from_symtab (SYMBOL_SYMTAB (symbol)); | |
334 | } | |
335 | ||
336 | /* (symbol-name <gdb:symbol>) -> string */ | |
337 | ||
338 | static SCM | |
339 | gdbscm_symbol_name (SCM self) | |
340 | { | |
341 | symbol_smob *s_smob | |
342 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
343 | const struct symbol *symbol = s_smob->symbol; | |
344 | ||
345 | return gdbscm_scm_from_c_string (SYMBOL_NATURAL_NAME (symbol)); | |
346 | } | |
347 | ||
348 | /* (symbol-linkage-name <gdb:symbol>) -> string */ | |
349 | ||
350 | static SCM | |
351 | gdbscm_symbol_linkage_name (SCM self) | |
352 | { | |
353 | symbol_smob *s_smob | |
354 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
355 | const struct symbol *symbol = s_smob->symbol; | |
356 | ||
357 | return gdbscm_scm_from_c_string (SYMBOL_LINKAGE_NAME (symbol)); | |
358 | } | |
359 | ||
360 | /* (symbol-print-name <gdb:symbol>) -> string */ | |
361 | ||
362 | static SCM | |
363 | gdbscm_symbol_print_name (SCM self) | |
364 | { | |
365 | symbol_smob *s_smob | |
366 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
367 | const struct symbol *symbol = s_smob->symbol; | |
368 | ||
369 | return gdbscm_scm_from_c_string (SYMBOL_PRINT_NAME (symbol)); | |
370 | } | |
371 | ||
372 | /* (symbol-addr-class <gdb:symbol>) -> integer */ | |
373 | ||
374 | static SCM | |
375 | gdbscm_symbol_addr_class (SCM self) | |
376 | { | |
377 | symbol_smob *s_smob | |
378 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
379 | const struct symbol *symbol = s_smob->symbol; | |
380 | ||
381 | return scm_from_int (SYMBOL_CLASS (symbol)); | |
382 | } | |
383 | ||
384 | /* (symbol-argument? <gdb:symbol>) -> boolean */ | |
385 | ||
386 | static SCM | |
387 | gdbscm_symbol_argument_p (SCM self) | |
388 | { | |
389 | symbol_smob *s_smob | |
390 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
391 | const struct symbol *symbol = s_smob->symbol; | |
392 | ||
393 | return scm_from_bool (SYMBOL_IS_ARGUMENT (symbol)); | |
394 | } | |
395 | ||
396 | /* (symbol-constant? <gdb:symbol>) -> boolean */ | |
397 | ||
398 | static SCM | |
399 | gdbscm_symbol_constant_p (SCM self) | |
400 | { | |
401 | symbol_smob *s_smob | |
402 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
403 | const struct symbol *symbol = s_smob->symbol; | |
404 | enum address_class class; | |
405 | ||
406 | class = SYMBOL_CLASS (symbol); | |
407 | ||
408 | return scm_from_bool (class == LOC_CONST || class == LOC_CONST_BYTES); | |
409 | } | |
410 | ||
411 | /* (symbol-function? <gdb:symbol>) -> boolean */ | |
412 | ||
413 | static SCM | |
414 | gdbscm_symbol_function_p (SCM self) | |
415 | { | |
416 | symbol_smob *s_smob | |
417 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
418 | const struct symbol *symbol = s_smob->symbol; | |
419 | enum address_class class; | |
420 | ||
421 | class = SYMBOL_CLASS (symbol); | |
422 | ||
423 | return scm_from_bool (class == LOC_BLOCK); | |
424 | } | |
425 | ||
426 | /* (symbol-variable? <gdb:symbol>) -> boolean */ | |
427 | ||
428 | static SCM | |
429 | gdbscm_symbol_variable_p (SCM self) | |
430 | { | |
431 | symbol_smob *s_smob | |
432 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
433 | const struct symbol *symbol = s_smob->symbol; | |
434 | enum address_class class; | |
435 | ||
436 | class = SYMBOL_CLASS (symbol); | |
437 | ||
438 | return scm_from_bool (!SYMBOL_IS_ARGUMENT (symbol) | |
439 | && (class == LOC_LOCAL || class == LOC_REGISTER | |
440 | || class == LOC_STATIC || class == LOC_COMPUTED | |
441 | || class == LOC_OPTIMIZED_OUT)); | |
442 | } | |
443 | ||
444 | /* (symbol-needs-frame? <gdb:symbol>) -> boolean | |
445 | Return #t if the symbol needs a frame for evaluation. */ | |
446 | ||
447 | static SCM | |
448 | gdbscm_symbol_needs_frame_p (SCM self) | |
449 | { | |
450 | symbol_smob *s_smob | |
451 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
452 | struct symbol *symbol = s_smob->symbol; | |
453 | volatile struct gdb_exception except; | |
454 | int result = 0; | |
455 | ||
456 | TRY_CATCH (except, RETURN_MASK_ALL) | |
457 | { | |
458 | result = symbol_read_needs_frame (symbol); | |
459 | } | |
460 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
461 | ||
462 | return scm_from_bool (result); | |
463 | } | |
464 | ||
465 | /* (symbol-line <gdb:symbol>) -> integer | |
466 | Return the line number at which the symbol was defined. */ | |
467 | ||
468 | static SCM | |
469 | gdbscm_symbol_line (SCM self) | |
470 | { | |
471 | symbol_smob *s_smob | |
472 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
473 | const struct symbol *symbol = s_smob->symbol; | |
474 | ||
475 | return scm_from_int (SYMBOL_LINE (symbol)); | |
476 | } | |
477 | ||
478 | /* (symbol-value <gdb:symbol> [#:frame <gdb:frame>]) -> <gdb:value> | |
479 | Return the value of the symbol, or an error in various circumstances. */ | |
480 | ||
481 | static SCM | |
482 | gdbscm_symbol_value (SCM self, SCM rest) | |
483 | { | |
484 | symbol_smob *s_smob | |
485 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
486 | struct symbol *symbol = s_smob->symbol; | |
487 | SCM keywords[] = { frame_keyword, SCM_BOOL_F }; | |
488 | int frame_pos = -1; | |
489 | SCM frame_scm = SCM_BOOL_F; | |
490 | frame_smob *f_smob = NULL; | |
491 | struct frame_info *frame_info = NULL; | |
492 | struct value *value = NULL; | |
493 | volatile struct gdb_exception except; | |
494 | ||
495 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, keywords, "#O", | |
496 | rest, &frame_pos, &frame_scm); | |
497 | if (!gdbscm_is_false (frame_scm)) | |
498 | f_smob = frscm_get_frame_smob_arg_unsafe (frame_scm, frame_pos, FUNC_NAME); | |
499 | ||
500 | if (SYMBOL_CLASS (symbol) == LOC_TYPEDEF) | |
501 | { | |
502 | gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG1, self, | |
503 | _("cannot get the value of a typedef")); | |
504 | } | |
505 | ||
506 | TRY_CATCH (except, RETURN_MASK_ALL) | |
507 | { | |
508 | if (f_smob != NULL) | |
509 | { | |
510 | frame_info = frscm_frame_smob_to_frame (f_smob); | |
511 | if (frame_info == NULL) | |
512 | error (_("Invalid frame")); | |
513 | } | |
514 | ||
515 | if (symbol_read_needs_frame (symbol) && frame_info == NULL) | |
516 | error (_("Symbol requires a frame to compute its value")); | |
517 | ||
518 | value = read_var_value (symbol, frame_info); | |
519 | } | |
520 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
521 | ||
522 | return vlscm_scm_from_value (value); | |
523 | } | |
524 | \f | |
525 | /* (lookup-symbol name [#:block <gdb:block>] [#:domain domain]) | |
526 | -> (<gdb:symbol> field-of-this?) | |
527 | The result is #f if the symbol is not found. | |
528 | See comment in lookup_symbol_in_language for field-of-this?. */ | |
529 | ||
530 | static SCM | |
531 | gdbscm_lookup_symbol (SCM name_scm, SCM rest) | |
532 | { | |
533 | char *name; | |
534 | SCM keywords[] = { block_keyword, domain_keyword, SCM_BOOL_F }; | |
535 | const struct block *block = NULL; | |
536 | SCM block_scm = SCM_BOOL_F; | |
537 | int domain = VAR_DOMAIN; | |
538 | int block_arg_pos = -1, domain_arg_pos = -1; | |
539 | struct field_of_this_result is_a_field_of_this; | |
540 | struct symbol *symbol = NULL; | |
541 | volatile struct gdb_exception except; | |
542 | struct cleanup *cleanups; | |
543 | ||
544 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, keywords, "s#Oi", | |
545 | name_scm, &name, rest, | |
546 | &block_arg_pos, &block_scm, | |
547 | &domain_arg_pos, &domain); | |
548 | ||
549 | cleanups = make_cleanup (xfree, name); | |
550 | ||
551 | if (block_arg_pos >= 0) | |
552 | { | |
553 | SCM except_scm; | |
554 | ||
555 | block = bkscm_scm_to_block (block_scm, block_arg_pos, FUNC_NAME, | |
556 | &except_scm); | |
557 | if (block == NULL) | |
558 | { | |
559 | do_cleanups (cleanups); | |
560 | gdbscm_throw (except_scm); | |
561 | } | |
562 | } | |
563 | else | |
564 | { | |
565 | struct frame_info *selected_frame; | |
566 | ||
567 | TRY_CATCH (except, RETURN_MASK_ALL) | |
568 | { | |
569 | selected_frame = get_selected_frame (_("no frame selected")); | |
570 | block = get_frame_block (selected_frame, NULL); | |
571 | } | |
572 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
573 | } | |
574 | ||
575 | TRY_CATCH (except, RETURN_MASK_ALL) | |
576 | { | |
577 | symbol = lookup_symbol (name, block, domain, &is_a_field_of_this); | |
578 | } | |
579 | do_cleanups (cleanups); | |
580 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
581 | ||
582 | if (symbol == NULL) | |
583 | return SCM_BOOL_F; | |
584 | ||
585 | return scm_list_2 (syscm_scm_from_symbol (symbol), | |
586 | scm_from_bool (is_a_field_of_this.type != NULL)); | |
587 | } | |
588 | ||
589 | /* (lookup-global-symbol name [#:domain domain]) -> <gdb:symbol> | |
590 | The result is #f if the symbol is not found. */ | |
591 | ||
592 | static SCM | |
593 | gdbscm_lookup_global_symbol (SCM name_scm, SCM rest) | |
594 | { | |
595 | char *name; | |
596 | SCM keywords[] = { domain_keyword, SCM_BOOL_F }; | |
597 | int domain_arg_pos = -1; | |
598 | int domain = VAR_DOMAIN; | |
599 | struct symbol *symbol = NULL; | |
600 | volatile struct gdb_exception except; | |
601 | struct cleanup *cleanups; | |
602 | ||
603 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, keywords, "s#i", | |
604 | name_scm, &name, rest, | |
605 | &domain_arg_pos, &domain); | |
606 | ||
607 | cleanups = make_cleanup (xfree, name); | |
608 | ||
609 | TRY_CATCH (except, RETURN_MASK_ALL) | |
610 | { | |
611 | symbol = lookup_symbol_global (name, NULL, domain); | |
612 | } | |
613 | do_cleanups (cleanups); | |
614 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
615 | ||
616 | if (symbol == NULL) | |
617 | return SCM_BOOL_F; | |
618 | ||
619 | return syscm_scm_from_symbol (symbol); | |
620 | } | |
621 | \f | |
622 | /* Initialize the Scheme symbol support. */ | |
623 | ||
624 | /* Note: The SYMBOL_ prefix on the integer constants here is present for | |
625 | compatibility with the Python support. */ | |
626 | ||
627 | static const scheme_integer_constant symbol_integer_constants[] = | |
628 | { | |
629 | #define X(SYM) { "SYMBOL_" #SYM, SYM } | |
630 | X (LOC_UNDEF), | |
631 | X (LOC_CONST), | |
632 | X (LOC_STATIC), | |
633 | X (LOC_REGISTER), | |
634 | X (LOC_ARG), | |
635 | X (LOC_REF_ARG), | |
636 | X (LOC_LOCAL), | |
637 | X (LOC_TYPEDEF), | |
638 | X (LOC_LABEL), | |
639 | X (LOC_BLOCK), | |
640 | X (LOC_CONST_BYTES), | |
641 | X (LOC_UNRESOLVED), | |
642 | X (LOC_OPTIMIZED_OUT), | |
643 | X (LOC_COMPUTED), | |
644 | X (LOC_REGPARM_ADDR), | |
645 | ||
646 | X (UNDEF_DOMAIN), | |
647 | X (VAR_DOMAIN), | |
648 | X (STRUCT_DOMAIN), | |
649 | X (LABEL_DOMAIN), | |
650 | X (VARIABLES_DOMAIN), | |
651 | X (FUNCTIONS_DOMAIN), | |
652 | X (TYPES_DOMAIN), | |
653 | #undef X | |
654 | ||
655 | END_INTEGER_CONSTANTS | |
656 | }; | |
657 | ||
658 | static const scheme_function symbol_functions[] = | |
659 | { | |
660 | { "symbol?", 1, 0, 0, gdbscm_symbol_p, | |
661 | "\ | |
662 | Return #t if the object is a <gdb:symbol> object." }, | |
663 | ||
664 | { "symbol-valid?", 1, 0, 0, gdbscm_symbol_valid_p, | |
665 | "\ | |
666 | Return #t if object is a valid <gdb:symbol> object.\n\ | |
667 | A valid symbol is a symbol that has not been freed.\n\ | |
668 | Symbols are freed when the objfile they come from is freed." }, | |
669 | ||
670 | { "symbol-type", 1, 0, 0, gdbscm_symbol_type, | |
671 | "\ | |
672 | Return the type of symbol." }, | |
673 | ||
674 | { "symbol-symtab", 1, 0, 0, gdbscm_symbol_symtab, | |
675 | "\ | |
676 | Return the symbol table (<gdb:symtab>) containing symbol." }, | |
677 | ||
678 | { "symbol-line", 1, 0, 0, gdbscm_symbol_line, | |
679 | "\ | |
680 | Return the line number at which the symbol was defined." }, | |
681 | ||
682 | { "symbol-name", 1, 0, 0, gdbscm_symbol_name, | |
683 | "\ | |
684 | Return the name of the symbol as a string." }, | |
685 | ||
686 | { "symbol-linkage-name", 1, 0, 0, gdbscm_symbol_linkage_name, | |
687 | "\ | |
688 | Return the linkage name of the symbol as a string." }, | |
689 | ||
690 | { "symbol-print-name", 1, 0, 0, gdbscm_symbol_print_name, | |
691 | "\ | |
692 | Return the print name of the symbol as a string.\n\ | |
693 | This is either name or linkage-name, depending on whether the user\n\ | |
694 | asked GDB to display demangled or mangled names." }, | |
695 | ||
696 | { "symbol-addr-class", 1, 0, 0, gdbscm_symbol_addr_class, | |
697 | "\ | |
698 | Return the address class of the symbol." }, | |
699 | ||
700 | { "symbol-needs-frame?", 1, 0, 0, gdbscm_symbol_needs_frame_p, | |
701 | "\ | |
702 | Return #t if the symbol needs a frame to compute its value." }, | |
703 | ||
704 | { "symbol-argument?", 1, 0, 0, gdbscm_symbol_argument_p, | |
705 | "\ | |
706 | Return #t if the symbol is a function argument." }, | |
707 | ||
708 | { "symbol-constant?", 1, 0, 0, gdbscm_symbol_constant_p, | |
709 | "\ | |
710 | Return #t if the symbol is a constant." }, | |
711 | ||
712 | { "symbol-function?", 1, 0, 0, gdbscm_symbol_function_p, | |
713 | "\ | |
714 | Return #t if the symbol is a function." }, | |
715 | ||
716 | { "symbol-variable?", 1, 0, 0, gdbscm_symbol_variable_p, | |
717 | "\ | |
718 | Return #t if the symbol is a variable." }, | |
719 | ||
720 | { "symbol-value", 1, 0, 1, gdbscm_symbol_value, | |
721 | "\ | |
722 | Return the value of the symbol.\n\ | |
723 | \n\ | |
724 | Arguments: <gdb:symbol> [#:frame frame]" }, | |
725 | ||
726 | { "lookup-symbol", 1, 0, 1, gdbscm_lookup_symbol, | |
727 | "\ | |
728 | Return (<gdb:symbol> field-of-this?) if found, otherwise #f.\n\ | |
729 | \n\ | |
730 | Arguments: name [#:block block] [#:domain domain]\n\ | |
731 | name: a string containing the name of the symbol to lookup\n\ | |
732 | block: a <gdb:block> object\n\ | |
733 | domain: a SYMBOL_*_DOMAIN value" }, | |
734 | ||
735 | { "lookup-global-symbol", 1, 0, 1, gdbscm_lookup_global_symbol, | |
736 | "\ | |
737 | Return <gdb:symbol> if found, otherwise #f.\n\ | |
738 | \n\ | |
739 | Arguments: name [#:domain domain]\n\ | |
740 | name: a string containing the name of the symbol to lookup\n\ | |
741 | domain: a SYMBOL_*_DOMAIN value" }, | |
742 | ||
743 | END_FUNCTIONS | |
744 | }; | |
745 | ||
746 | void | |
747 | gdbscm_initialize_symbols (void) | |
748 | { | |
749 | symbol_smob_tag | |
750 | = gdbscm_make_smob_type (symbol_smob_name, sizeof (symbol_smob)); | |
ed3ef339 DE |
751 | scm_set_smob_free (symbol_smob_tag, syscm_free_symbol_smob); |
752 | scm_set_smob_print (symbol_smob_tag, syscm_print_symbol_smob); | |
753 | ||
754 | gdbscm_define_integer_constants (symbol_integer_constants, 1); | |
755 | gdbscm_define_functions (symbol_functions, 1); | |
756 | ||
757 | block_keyword = scm_from_latin1_keyword ("block"); | |
758 | domain_keyword = scm_from_latin1_keyword ("domain"); | |
759 | frame_keyword = scm_from_latin1_keyword ("frame"); | |
760 | ||
761 | /* Register an objfile "free" callback so we can properly | |
762 | invalidate symbols when an object file is about to be deleted. */ | |
763 | syscm_objfile_data_key | |
764 | = register_objfile_data_with_cleanup (NULL, syscm_del_objfile_symbols); | |
765 | } |