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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 | ||
98 | /* The smob "mark" function for <gdb:symbol>. */ | |
99 | ||
100 | static SCM | |
101 | syscm_mark_symbol_smob (SCM self) | |
102 | { | |
103 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (self); | |
104 | ||
105 | /* Do this last. */ | |
106 | return gdbscm_mark_eqable_gsmob (&s_smob->base); | |
107 | } | |
108 | ||
109 | /* The smob "free" function for <gdb:symbol>. */ | |
110 | ||
111 | static size_t | |
112 | syscm_free_symbol_smob (SCM self) | |
113 | { | |
114 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (self); | |
115 | ||
116 | if (s_smob->symbol != NULL) | |
117 | { | |
118 | htab_t htab = syscm_objfile_symbol_map (s_smob->symbol); | |
119 | ||
120 | gdbscm_clear_eqable_gsmob_ptr_slot (htab, &s_smob->base); | |
121 | } | |
122 | ||
123 | /* Not necessary, done to catch bugs. */ | |
124 | s_smob->symbol = NULL; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | /* The smob "print" function for <gdb:symbol>. */ | |
130 | ||
131 | static int | |
132 | syscm_print_symbol_smob (SCM self, SCM port, scm_print_state *pstate) | |
133 | { | |
134 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (self); | |
135 | ||
136 | if (pstate->writingp) | |
137 | gdbscm_printf (port, "#<%s ", symbol_smob_name); | |
138 | gdbscm_printf (port, "%s", | |
139 | s_smob->symbol != NULL | |
140 | ? SYMBOL_PRINT_NAME (s_smob->symbol) | |
141 | : "<invalid>"); | |
142 | if (pstate->writingp) | |
143 | scm_puts (">", port); | |
144 | ||
145 | scm_remember_upto_here_1 (self); | |
146 | ||
147 | /* Non-zero means success. */ | |
148 | return 1; | |
149 | } | |
150 | ||
151 | /* Low level routine to create a <gdb:symbol> object. */ | |
152 | ||
153 | static SCM | |
154 | syscm_make_symbol_smob (void) | |
155 | { | |
156 | symbol_smob *s_smob = (symbol_smob *) | |
157 | scm_gc_malloc (sizeof (symbol_smob), symbol_smob_name); | |
158 | SCM s_scm; | |
159 | ||
160 | s_smob->symbol = NULL; | |
161 | s_scm = scm_new_smob (symbol_smob_tag, (scm_t_bits) s_smob); | |
162 | gdbscm_init_eqable_gsmob (&s_smob->base); | |
163 | ||
164 | return s_scm; | |
165 | } | |
166 | ||
167 | /* Return non-zero if SCM is a symbol smob. */ | |
168 | ||
169 | int | |
170 | syscm_is_symbol (SCM scm) | |
171 | { | |
172 | return SCM_SMOB_PREDICATE (symbol_smob_tag, scm); | |
173 | } | |
174 | ||
175 | /* (symbol? object) -> boolean */ | |
176 | ||
177 | static SCM | |
178 | gdbscm_symbol_p (SCM scm) | |
179 | { | |
180 | return scm_from_bool (syscm_is_symbol (scm)); | |
181 | } | |
182 | ||
183 | /* Return the existing object that encapsulates SYMBOL, or create a new | |
184 | <gdb:symbol> object. */ | |
185 | ||
186 | SCM | |
187 | syscm_scm_from_symbol (struct symbol *symbol) | |
188 | { | |
189 | htab_t htab; | |
190 | eqable_gdb_smob **slot; | |
191 | symbol_smob *s_smob, s_smob_for_lookup; | |
192 | SCM s_scm; | |
193 | ||
194 | /* If we've already created a gsmob for this symbol, return it. | |
195 | This makes symbols eq?-able. */ | |
196 | htab = syscm_objfile_symbol_map (symbol); | |
197 | s_smob_for_lookup.symbol = symbol; | |
198 | slot = gdbscm_find_eqable_gsmob_ptr_slot (htab, &s_smob_for_lookup.base); | |
199 | if (*slot != NULL) | |
200 | return (*slot)->containing_scm; | |
201 | ||
202 | s_scm = syscm_make_symbol_smob (); | |
203 | s_smob = (symbol_smob *) SCM_SMOB_DATA (s_scm); | |
204 | s_smob->symbol = symbol; | |
205 | gdbscm_fill_eqable_gsmob_ptr_slot (slot, &s_smob->base, s_scm); | |
206 | ||
207 | return s_scm; | |
208 | } | |
209 | ||
210 | /* Returns the <gdb:symbol> object in SELF. | |
211 | Throws an exception if SELF is not a <gdb:symbol> object. */ | |
212 | ||
213 | static SCM | |
214 | syscm_get_symbol_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
215 | { | |
216 | SCM_ASSERT_TYPE (syscm_is_symbol (self), self, arg_pos, func_name, | |
217 | symbol_smob_name); | |
218 | ||
219 | return self; | |
220 | } | |
221 | ||
222 | /* Returns a pointer to the symbol smob of SELF. | |
223 | Throws an exception if SELF is not a <gdb:symbol> object. */ | |
224 | ||
225 | static symbol_smob * | |
226 | syscm_get_symbol_smob_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
227 | { | |
228 | SCM s_scm = syscm_get_symbol_arg_unsafe (self, arg_pos, func_name); | |
229 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (s_scm); | |
230 | ||
231 | return s_smob; | |
232 | } | |
233 | ||
234 | /* Return non-zero if symbol S_SMOB is valid. */ | |
235 | ||
236 | static int | |
237 | syscm_is_valid (symbol_smob *s_smob) | |
238 | { | |
239 | return s_smob->symbol != NULL; | |
240 | } | |
241 | ||
242 | /* Throw a Scheme error if SELF is not a valid symbol smob. | |
243 | Otherwise return a pointer to the symbol smob. */ | |
244 | ||
245 | static symbol_smob * | |
246 | syscm_get_valid_symbol_smob_arg_unsafe (SCM self, int arg_pos, | |
247 | const char *func_name) | |
248 | { | |
249 | symbol_smob *s_smob | |
250 | = syscm_get_symbol_smob_arg_unsafe (self, arg_pos, func_name); | |
251 | ||
252 | if (!syscm_is_valid (s_smob)) | |
253 | { | |
254 | gdbscm_invalid_object_error (func_name, arg_pos, self, | |
255 | _("<gdb:symbol>")); | |
256 | } | |
257 | ||
258 | return s_smob; | |
259 | } | |
260 | ||
261 | /* Throw a Scheme error if SELF is not a valid symbol smob. | |
262 | Otherwise return a pointer to the symbol struct. */ | |
263 | ||
264 | struct symbol * | |
265 | syscm_get_valid_symbol_arg_unsafe (SCM self, int arg_pos, | |
266 | const char *func_name) | |
267 | { | |
268 | symbol_smob *s_smob = syscm_get_valid_symbol_smob_arg_unsafe (self, arg_pos, | |
269 | func_name); | |
270 | ||
271 | return s_smob->symbol; | |
272 | } | |
273 | ||
274 | /* Helper function for syscm_del_objfile_symbols to mark the symbol | |
275 | as invalid. */ | |
276 | ||
277 | static int | |
278 | syscm_mark_symbol_invalid (void **slot, void *info) | |
279 | { | |
280 | symbol_smob *s_smob = (symbol_smob *) *slot; | |
281 | ||
282 | s_smob->symbol = NULL; | |
283 | return 1; | |
284 | } | |
285 | ||
286 | /* This function is called when an objfile is about to be freed. | |
287 | Invalidate the symbol as further actions on the symbol would result | |
288 | in bad data. All access to s_smob->symbol should be gated by | |
289 | syscm_get_valid_symbol_smob_arg_unsafe which will raise an exception on | |
290 | invalid symbols. */ | |
291 | ||
292 | static void | |
293 | syscm_del_objfile_symbols (struct objfile *objfile, void *datum) | |
294 | { | |
295 | htab_t htab = datum; | |
296 | ||
297 | if (htab != NULL) | |
298 | { | |
299 | htab_traverse_noresize (htab, syscm_mark_symbol_invalid, NULL); | |
300 | htab_delete (htab); | |
301 | } | |
302 | } | |
303 | \f | |
304 | /* Symbol methods. */ | |
305 | ||
306 | /* (symbol-valid? <gdb:symbol>) -> boolean | |
307 | Returns #t if SELF still exists in GDB. */ | |
308 | ||
309 | static SCM | |
310 | gdbscm_symbol_valid_p (SCM self) | |
311 | { | |
312 | symbol_smob *s_smob | |
313 | = syscm_get_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
314 | ||
315 | return scm_from_bool (syscm_is_valid (s_smob)); | |
316 | } | |
317 | ||
318 | /* (symbol-type <gdb:symbol>) -> <gdb:type> | |
319 | Return the type of SELF, or #f if SELF has no type. */ | |
320 | ||
321 | static SCM | |
322 | gdbscm_symbol_type (SCM self) | |
323 | { | |
324 | symbol_smob *s_smob | |
325 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
326 | const struct symbol *symbol = s_smob->symbol; | |
327 | ||
328 | if (SYMBOL_TYPE (symbol) == NULL) | |
329 | return SCM_BOOL_F; | |
330 | ||
331 | return tyscm_scm_from_type (SYMBOL_TYPE (symbol)); | |
332 | } | |
333 | ||
334 | /* (symbol-symtab <gdb:symbol>) -> <gdb:symtab> | |
335 | Return the symbol table of SELF. */ | |
336 | ||
337 | static SCM | |
338 | gdbscm_symbol_symtab (SCM self) | |
339 | { | |
340 | symbol_smob *s_smob | |
341 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
342 | const struct symbol *symbol = s_smob->symbol; | |
343 | ||
344 | return stscm_scm_from_symtab (SYMBOL_SYMTAB (symbol)); | |
345 | } | |
346 | ||
347 | /* (symbol-name <gdb:symbol>) -> string */ | |
348 | ||
349 | static SCM | |
350 | gdbscm_symbol_name (SCM self) | |
351 | { | |
352 | symbol_smob *s_smob | |
353 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
354 | const struct symbol *symbol = s_smob->symbol; | |
355 | ||
356 | return gdbscm_scm_from_c_string (SYMBOL_NATURAL_NAME (symbol)); | |
357 | } | |
358 | ||
359 | /* (symbol-linkage-name <gdb:symbol>) -> string */ | |
360 | ||
361 | static SCM | |
362 | gdbscm_symbol_linkage_name (SCM self) | |
363 | { | |
364 | symbol_smob *s_smob | |
365 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
366 | const struct symbol *symbol = s_smob->symbol; | |
367 | ||
368 | return gdbscm_scm_from_c_string (SYMBOL_LINKAGE_NAME (symbol)); | |
369 | } | |
370 | ||
371 | /* (symbol-print-name <gdb:symbol>) -> string */ | |
372 | ||
373 | static SCM | |
374 | gdbscm_symbol_print_name (SCM self) | |
375 | { | |
376 | symbol_smob *s_smob | |
377 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
378 | const struct symbol *symbol = s_smob->symbol; | |
379 | ||
380 | return gdbscm_scm_from_c_string (SYMBOL_PRINT_NAME (symbol)); | |
381 | } | |
382 | ||
383 | /* (symbol-addr-class <gdb:symbol>) -> integer */ | |
384 | ||
385 | static SCM | |
386 | gdbscm_symbol_addr_class (SCM self) | |
387 | { | |
388 | symbol_smob *s_smob | |
389 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
390 | const struct symbol *symbol = s_smob->symbol; | |
391 | ||
392 | return scm_from_int (SYMBOL_CLASS (symbol)); | |
393 | } | |
394 | ||
395 | /* (symbol-argument? <gdb:symbol>) -> boolean */ | |
396 | ||
397 | static SCM | |
398 | gdbscm_symbol_argument_p (SCM self) | |
399 | { | |
400 | symbol_smob *s_smob | |
401 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
402 | const struct symbol *symbol = s_smob->symbol; | |
403 | ||
404 | return scm_from_bool (SYMBOL_IS_ARGUMENT (symbol)); | |
405 | } | |
406 | ||
407 | /* (symbol-constant? <gdb:symbol>) -> boolean */ | |
408 | ||
409 | static SCM | |
410 | gdbscm_symbol_constant_p (SCM self) | |
411 | { | |
412 | symbol_smob *s_smob | |
413 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
414 | const struct symbol *symbol = s_smob->symbol; | |
415 | enum address_class class; | |
416 | ||
417 | class = SYMBOL_CLASS (symbol); | |
418 | ||
419 | return scm_from_bool (class == LOC_CONST || class == LOC_CONST_BYTES); | |
420 | } | |
421 | ||
422 | /* (symbol-function? <gdb:symbol>) -> boolean */ | |
423 | ||
424 | static SCM | |
425 | gdbscm_symbol_function_p (SCM self) | |
426 | { | |
427 | symbol_smob *s_smob | |
428 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
429 | const struct symbol *symbol = s_smob->symbol; | |
430 | enum address_class class; | |
431 | ||
432 | class = SYMBOL_CLASS (symbol); | |
433 | ||
434 | return scm_from_bool (class == LOC_BLOCK); | |
435 | } | |
436 | ||
437 | /* (symbol-variable? <gdb:symbol>) -> boolean */ | |
438 | ||
439 | static SCM | |
440 | gdbscm_symbol_variable_p (SCM self) | |
441 | { | |
442 | symbol_smob *s_smob | |
443 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
444 | const struct symbol *symbol = s_smob->symbol; | |
445 | enum address_class class; | |
446 | ||
447 | class = SYMBOL_CLASS (symbol); | |
448 | ||
449 | return scm_from_bool (!SYMBOL_IS_ARGUMENT (symbol) | |
450 | && (class == LOC_LOCAL || class == LOC_REGISTER | |
451 | || class == LOC_STATIC || class == LOC_COMPUTED | |
452 | || class == LOC_OPTIMIZED_OUT)); | |
453 | } | |
454 | ||
455 | /* (symbol-needs-frame? <gdb:symbol>) -> boolean | |
456 | Return #t if the symbol needs a frame for evaluation. */ | |
457 | ||
458 | static SCM | |
459 | gdbscm_symbol_needs_frame_p (SCM self) | |
460 | { | |
461 | symbol_smob *s_smob | |
462 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
463 | struct symbol *symbol = s_smob->symbol; | |
464 | volatile struct gdb_exception except; | |
465 | int result = 0; | |
466 | ||
467 | TRY_CATCH (except, RETURN_MASK_ALL) | |
468 | { | |
469 | result = symbol_read_needs_frame (symbol); | |
470 | } | |
471 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
472 | ||
473 | return scm_from_bool (result); | |
474 | } | |
475 | ||
476 | /* (symbol-line <gdb:symbol>) -> integer | |
477 | Return the line number at which the symbol was defined. */ | |
478 | ||
479 | static SCM | |
480 | gdbscm_symbol_line (SCM self) | |
481 | { | |
482 | symbol_smob *s_smob | |
483 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
484 | const struct symbol *symbol = s_smob->symbol; | |
485 | ||
486 | return scm_from_int (SYMBOL_LINE (symbol)); | |
487 | } | |
488 | ||
489 | /* (symbol-value <gdb:symbol> [#:frame <gdb:frame>]) -> <gdb:value> | |
490 | Return the value of the symbol, or an error in various circumstances. */ | |
491 | ||
492 | static SCM | |
493 | gdbscm_symbol_value (SCM self, SCM rest) | |
494 | { | |
495 | symbol_smob *s_smob | |
496 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
497 | struct symbol *symbol = s_smob->symbol; | |
498 | SCM keywords[] = { frame_keyword, SCM_BOOL_F }; | |
499 | int frame_pos = -1; | |
500 | SCM frame_scm = SCM_BOOL_F; | |
501 | frame_smob *f_smob = NULL; | |
502 | struct frame_info *frame_info = NULL; | |
503 | struct value *value = NULL; | |
504 | volatile struct gdb_exception except; | |
505 | ||
506 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, keywords, "#O", | |
507 | rest, &frame_pos, &frame_scm); | |
508 | if (!gdbscm_is_false (frame_scm)) | |
509 | f_smob = frscm_get_frame_smob_arg_unsafe (frame_scm, frame_pos, FUNC_NAME); | |
510 | ||
511 | if (SYMBOL_CLASS (symbol) == LOC_TYPEDEF) | |
512 | { | |
513 | gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG1, self, | |
514 | _("cannot get the value of a typedef")); | |
515 | } | |
516 | ||
517 | TRY_CATCH (except, RETURN_MASK_ALL) | |
518 | { | |
519 | if (f_smob != NULL) | |
520 | { | |
521 | frame_info = frscm_frame_smob_to_frame (f_smob); | |
522 | if (frame_info == NULL) | |
523 | error (_("Invalid frame")); | |
524 | } | |
525 | ||
526 | if (symbol_read_needs_frame (symbol) && frame_info == NULL) | |
527 | error (_("Symbol requires a frame to compute its value")); | |
528 | ||
529 | value = read_var_value (symbol, frame_info); | |
530 | } | |
531 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
532 | ||
533 | return vlscm_scm_from_value (value); | |
534 | } | |
535 | \f | |
536 | /* (lookup-symbol name [#:block <gdb:block>] [#:domain domain]) | |
537 | -> (<gdb:symbol> field-of-this?) | |
538 | The result is #f if the symbol is not found. | |
539 | See comment in lookup_symbol_in_language for field-of-this?. */ | |
540 | ||
541 | static SCM | |
542 | gdbscm_lookup_symbol (SCM name_scm, SCM rest) | |
543 | { | |
544 | char *name; | |
545 | SCM keywords[] = { block_keyword, domain_keyword, SCM_BOOL_F }; | |
546 | const struct block *block = NULL; | |
547 | SCM block_scm = SCM_BOOL_F; | |
548 | int domain = VAR_DOMAIN; | |
549 | int block_arg_pos = -1, domain_arg_pos = -1; | |
550 | struct field_of_this_result is_a_field_of_this; | |
551 | struct symbol *symbol = NULL; | |
552 | volatile struct gdb_exception except; | |
553 | struct cleanup *cleanups; | |
554 | ||
555 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, keywords, "s#Oi", | |
556 | name_scm, &name, rest, | |
557 | &block_arg_pos, &block_scm, | |
558 | &domain_arg_pos, &domain); | |
559 | ||
560 | cleanups = make_cleanup (xfree, name); | |
561 | ||
562 | if (block_arg_pos >= 0) | |
563 | { | |
564 | SCM except_scm; | |
565 | ||
566 | block = bkscm_scm_to_block (block_scm, block_arg_pos, FUNC_NAME, | |
567 | &except_scm); | |
568 | if (block == NULL) | |
569 | { | |
570 | do_cleanups (cleanups); | |
571 | gdbscm_throw (except_scm); | |
572 | } | |
573 | } | |
574 | else | |
575 | { | |
576 | struct frame_info *selected_frame; | |
577 | ||
578 | TRY_CATCH (except, RETURN_MASK_ALL) | |
579 | { | |
580 | selected_frame = get_selected_frame (_("no frame selected")); | |
581 | block = get_frame_block (selected_frame, NULL); | |
582 | } | |
583 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
584 | } | |
585 | ||
586 | TRY_CATCH (except, RETURN_MASK_ALL) | |
587 | { | |
588 | symbol = lookup_symbol (name, block, domain, &is_a_field_of_this); | |
589 | } | |
590 | do_cleanups (cleanups); | |
591 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
592 | ||
593 | if (symbol == NULL) | |
594 | return SCM_BOOL_F; | |
595 | ||
596 | return scm_list_2 (syscm_scm_from_symbol (symbol), | |
597 | scm_from_bool (is_a_field_of_this.type != NULL)); | |
598 | } | |
599 | ||
600 | /* (lookup-global-symbol name [#:domain domain]) -> <gdb:symbol> | |
601 | The result is #f if the symbol is not found. */ | |
602 | ||
603 | static SCM | |
604 | gdbscm_lookup_global_symbol (SCM name_scm, SCM rest) | |
605 | { | |
606 | char *name; | |
607 | SCM keywords[] = { domain_keyword, SCM_BOOL_F }; | |
608 | int domain_arg_pos = -1; | |
609 | int domain = VAR_DOMAIN; | |
610 | struct symbol *symbol = NULL; | |
611 | volatile struct gdb_exception except; | |
612 | struct cleanup *cleanups; | |
613 | ||
614 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, keywords, "s#i", | |
615 | name_scm, &name, rest, | |
616 | &domain_arg_pos, &domain); | |
617 | ||
618 | cleanups = make_cleanup (xfree, name); | |
619 | ||
620 | TRY_CATCH (except, RETURN_MASK_ALL) | |
621 | { | |
622 | symbol = lookup_symbol_global (name, NULL, domain); | |
623 | } | |
624 | do_cleanups (cleanups); | |
625 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
626 | ||
627 | if (symbol == NULL) | |
628 | return SCM_BOOL_F; | |
629 | ||
630 | return syscm_scm_from_symbol (symbol); | |
631 | } | |
632 | \f | |
633 | /* Initialize the Scheme symbol support. */ | |
634 | ||
635 | /* Note: The SYMBOL_ prefix on the integer constants here is present for | |
636 | compatibility with the Python support. */ | |
637 | ||
638 | static const scheme_integer_constant symbol_integer_constants[] = | |
639 | { | |
640 | #define X(SYM) { "SYMBOL_" #SYM, SYM } | |
641 | X (LOC_UNDEF), | |
642 | X (LOC_CONST), | |
643 | X (LOC_STATIC), | |
644 | X (LOC_REGISTER), | |
645 | X (LOC_ARG), | |
646 | X (LOC_REF_ARG), | |
647 | X (LOC_LOCAL), | |
648 | X (LOC_TYPEDEF), | |
649 | X (LOC_LABEL), | |
650 | X (LOC_BLOCK), | |
651 | X (LOC_CONST_BYTES), | |
652 | X (LOC_UNRESOLVED), | |
653 | X (LOC_OPTIMIZED_OUT), | |
654 | X (LOC_COMPUTED), | |
655 | X (LOC_REGPARM_ADDR), | |
656 | ||
657 | X (UNDEF_DOMAIN), | |
658 | X (VAR_DOMAIN), | |
659 | X (STRUCT_DOMAIN), | |
660 | X (LABEL_DOMAIN), | |
661 | X (VARIABLES_DOMAIN), | |
662 | X (FUNCTIONS_DOMAIN), | |
663 | X (TYPES_DOMAIN), | |
664 | #undef X | |
665 | ||
666 | END_INTEGER_CONSTANTS | |
667 | }; | |
668 | ||
669 | static const scheme_function symbol_functions[] = | |
670 | { | |
671 | { "symbol?", 1, 0, 0, gdbscm_symbol_p, | |
672 | "\ | |
673 | Return #t if the object is a <gdb:symbol> object." }, | |
674 | ||
675 | { "symbol-valid?", 1, 0, 0, gdbscm_symbol_valid_p, | |
676 | "\ | |
677 | Return #t if object is a valid <gdb:symbol> object.\n\ | |
678 | A valid symbol is a symbol that has not been freed.\n\ | |
679 | Symbols are freed when the objfile they come from is freed." }, | |
680 | ||
681 | { "symbol-type", 1, 0, 0, gdbscm_symbol_type, | |
682 | "\ | |
683 | Return the type of symbol." }, | |
684 | ||
685 | { "symbol-symtab", 1, 0, 0, gdbscm_symbol_symtab, | |
686 | "\ | |
687 | Return the symbol table (<gdb:symtab>) containing symbol." }, | |
688 | ||
689 | { "symbol-line", 1, 0, 0, gdbscm_symbol_line, | |
690 | "\ | |
691 | Return the line number at which the symbol was defined." }, | |
692 | ||
693 | { "symbol-name", 1, 0, 0, gdbscm_symbol_name, | |
694 | "\ | |
695 | Return the name of the symbol as a string." }, | |
696 | ||
697 | { "symbol-linkage-name", 1, 0, 0, gdbscm_symbol_linkage_name, | |
698 | "\ | |
699 | Return the linkage name of the symbol as a string." }, | |
700 | ||
701 | { "symbol-print-name", 1, 0, 0, gdbscm_symbol_print_name, | |
702 | "\ | |
703 | Return the print name of the symbol as a string.\n\ | |
704 | This is either name or linkage-name, depending on whether the user\n\ | |
705 | asked GDB to display demangled or mangled names." }, | |
706 | ||
707 | { "symbol-addr-class", 1, 0, 0, gdbscm_symbol_addr_class, | |
708 | "\ | |
709 | Return the address class of the symbol." }, | |
710 | ||
711 | { "symbol-needs-frame?", 1, 0, 0, gdbscm_symbol_needs_frame_p, | |
712 | "\ | |
713 | Return #t if the symbol needs a frame to compute its value." }, | |
714 | ||
715 | { "symbol-argument?", 1, 0, 0, gdbscm_symbol_argument_p, | |
716 | "\ | |
717 | Return #t if the symbol is a function argument." }, | |
718 | ||
719 | { "symbol-constant?", 1, 0, 0, gdbscm_symbol_constant_p, | |
720 | "\ | |
721 | Return #t if the symbol is a constant." }, | |
722 | ||
723 | { "symbol-function?", 1, 0, 0, gdbscm_symbol_function_p, | |
724 | "\ | |
725 | Return #t if the symbol is a function." }, | |
726 | ||
727 | { "symbol-variable?", 1, 0, 0, gdbscm_symbol_variable_p, | |
728 | "\ | |
729 | Return #t if the symbol is a variable." }, | |
730 | ||
731 | { "symbol-value", 1, 0, 1, gdbscm_symbol_value, | |
732 | "\ | |
733 | Return the value of the symbol.\n\ | |
734 | \n\ | |
735 | Arguments: <gdb:symbol> [#:frame frame]" }, | |
736 | ||
737 | { "lookup-symbol", 1, 0, 1, gdbscm_lookup_symbol, | |
738 | "\ | |
739 | Return (<gdb:symbol> field-of-this?) if found, otherwise #f.\n\ | |
740 | \n\ | |
741 | Arguments: name [#:block block] [#:domain domain]\n\ | |
742 | name: a string containing the name of the symbol to lookup\n\ | |
743 | block: a <gdb:block> object\n\ | |
744 | domain: a SYMBOL_*_DOMAIN value" }, | |
745 | ||
746 | { "lookup-global-symbol", 1, 0, 1, gdbscm_lookup_global_symbol, | |
747 | "\ | |
748 | Return <gdb:symbol> if found, otherwise #f.\n\ | |
749 | \n\ | |
750 | Arguments: name [#:domain domain]\n\ | |
751 | name: a string containing the name of the symbol to lookup\n\ | |
752 | domain: a SYMBOL_*_DOMAIN value" }, | |
753 | ||
754 | END_FUNCTIONS | |
755 | }; | |
756 | ||
757 | void | |
758 | gdbscm_initialize_symbols (void) | |
759 | { | |
760 | symbol_smob_tag | |
761 | = gdbscm_make_smob_type (symbol_smob_name, sizeof (symbol_smob)); | |
762 | scm_set_smob_mark (symbol_smob_tag, syscm_mark_symbol_smob); | |
763 | scm_set_smob_free (symbol_smob_tag, syscm_free_symbol_smob); | |
764 | scm_set_smob_print (symbol_smob_tag, syscm_print_symbol_smob); | |
765 | ||
766 | gdbscm_define_integer_constants (symbol_integer_constants, 1); | |
767 | gdbscm_define_functions (symbol_functions, 1); | |
768 | ||
769 | block_keyword = scm_from_latin1_keyword ("block"); | |
770 | domain_keyword = scm_from_latin1_keyword ("domain"); | |
771 | frame_keyword = scm_from_latin1_keyword ("frame"); | |
772 | ||
773 | /* Register an objfile "free" callback so we can properly | |
774 | invalidate symbols when an object file is about to be deleted. */ | |
775 | syscm_objfile_data_key | |
776 | = register_objfile_data_with_cleanup (NULL, syscm_del_objfile_symbols); | |
777 | } |