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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 | { | |
b2715b27 | 103 | return SCM_BOOL_F; |
ed3ef339 DE |
104 | } |
105 | ||
106 | /* The smob "free" function for <gdb:symbol>. */ | |
107 | ||
108 | static size_t | |
109 | syscm_free_symbol_smob (SCM self) | |
110 | { | |
111 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (self); | |
112 | ||
113 | if (s_smob->symbol != NULL) | |
114 | { | |
115 | htab_t htab = syscm_objfile_symbol_map (s_smob->symbol); | |
116 | ||
117 | gdbscm_clear_eqable_gsmob_ptr_slot (htab, &s_smob->base); | |
118 | } | |
119 | ||
120 | /* Not necessary, done to catch bugs. */ | |
121 | s_smob->symbol = NULL; | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | /* The smob "print" function for <gdb:symbol>. */ | |
127 | ||
128 | static int | |
129 | syscm_print_symbol_smob (SCM self, SCM port, scm_print_state *pstate) | |
130 | { | |
131 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (self); | |
132 | ||
133 | if (pstate->writingp) | |
134 | gdbscm_printf (port, "#<%s ", symbol_smob_name); | |
135 | gdbscm_printf (port, "%s", | |
136 | s_smob->symbol != NULL | |
137 | ? SYMBOL_PRINT_NAME (s_smob->symbol) | |
138 | : "<invalid>"); | |
139 | if (pstate->writingp) | |
140 | scm_puts (">", port); | |
141 | ||
142 | scm_remember_upto_here_1 (self); | |
143 | ||
144 | /* Non-zero means success. */ | |
145 | return 1; | |
146 | } | |
147 | ||
148 | /* Low level routine to create a <gdb:symbol> object. */ | |
149 | ||
150 | static SCM | |
151 | syscm_make_symbol_smob (void) | |
152 | { | |
153 | symbol_smob *s_smob = (symbol_smob *) | |
154 | scm_gc_malloc (sizeof (symbol_smob), symbol_smob_name); | |
155 | SCM s_scm; | |
156 | ||
157 | s_smob->symbol = NULL; | |
158 | s_scm = scm_new_smob (symbol_smob_tag, (scm_t_bits) s_smob); | |
1254eefc | 159 | gdbscm_init_eqable_gsmob (&s_smob->base, s_scm); |
ed3ef339 DE |
160 | |
161 | return s_scm; | |
162 | } | |
163 | ||
164 | /* Return non-zero if SCM is a symbol smob. */ | |
165 | ||
166 | int | |
167 | syscm_is_symbol (SCM scm) | |
168 | { | |
169 | return SCM_SMOB_PREDICATE (symbol_smob_tag, scm); | |
170 | } | |
171 | ||
172 | /* (symbol? object) -> boolean */ | |
173 | ||
174 | static SCM | |
175 | gdbscm_symbol_p (SCM scm) | |
176 | { | |
177 | return scm_from_bool (syscm_is_symbol (scm)); | |
178 | } | |
179 | ||
180 | /* Return the existing object that encapsulates SYMBOL, or create a new | |
181 | <gdb:symbol> object. */ | |
182 | ||
183 | SCM | |
184 | syscm_scm_from_symbol (struct symbol *symbol) | |
185 | { | |
186 | htab_t htab; | |
187 | eqable_gdb_smob **slot; | |
188 | symbol_smob *s_smob, s_smob_for_lookup; | |
189 | SCM s_scm; | |
190 | ||
191 | /* If we've already created a gsmob for this symbol, return it. | |
192 | This makes symbols eq?-able. */ | |
193 | htab = syscm_objfile_symbol_map (symbol); | |
194 | s_smob_for_lookup.symbol = symbol; | |
195 | slot = gdbscm_find_eqable_gsmob_ptr_slot (htab, &s_smob_for_lookup.base); | |
196 | if (*slot != NULL) | |
197 | return (*slot)->containing_scm; | |
198 | ||
199 | s_scm = syscm_make_symbol_smob (); | |
200 | s_smob = (symbol_smob *) SCM_SMOB_DATA (s_scm); | |
201 | s_smob->symbol = symbol; | |
1254eefc | 202 | gdbscm_fill_eqable_gsmob_ptr_slot (slot, &s_smob->base); |
ed3ef339 DE |
203 | |
204 | return s_scm; | |
205 | } | |
206 | ||
207 | /* Returns the <gdb:symbol> object in SELF. | |
208 | Throws an exception if SELF is not a <gdb:symbol> object. */ | |
209 | ||
210 | static SCM | |
211 | syscm_get_symbol_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
212 | { | |
213 | SCM_ASSERT_TYPE (syscm_is_symbol (self), self, arg_pos, func_name, | |
214 | symbol_smob_name); | |
215 | ||
216 | return self; | |
217 | } | |
218 | ||
219 | /* Returns a pointer to the symbol smob of SELF. | |
220 | Throws an exception if SELF is not a <gdb:symbol> object. */ | |
221 | ||
222 | static symbol_smob * | |
223 | syscm_get_symbol_smob_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
224 | { | |
225 | SCM s_scm = syscm_get_symbol_arg_unsafe (self, arg_pos, func_name); | |
226 | symbol_smob *s_smob = (symbol_smob *) SCM_SMOB_DATA (s_scm); | |
227 | ||
228 | return s_smob; | |
229 | } | |
230 | ||
231 | /* Return non-zero if symbol S_SMOB is valid. */ | |
232 | ||
233 | static int | |
234 | syscm_is_valid (symbol_smob *s_smob) | |
235 | { | |
236 | return s_smob->symbol != NULL; | |
237 | } | |
238 | ||
239 | /* Throw a Scheme error if SELF is not a valid symbol smob. | |
240 | Otherwise return a pointer to the symbol smob. */ | |
241 | ||
242 | static symbol_smob * | |
243 | syscm_get_valid_symbol_smob_arg_unsafe (SCM self, int arg_pos, | |
244 | const char *func_name) | |
245 | { | |
246 | symbol_smob *s_smob | |
247 | = syscm_get_symbol_smob_arg_unsafe (self, arg_pos, func_name); | |
248 | ||
249 | if (!syscm_is_valid (s_smob)) | |
250 | { | |
251 | gdbscm_invalid_object_error (func_name, arg_pos, self, | |
252 | _("<gdb:symbol>")); | |
253 | } | |
254 | ||
255 | return s_smob; | |
256 | } | |
257 | ||
258 | /* Throw a Scheme error if SELF is not a valid symbol smob. | |
259 | Otherwise return a pointer to the symbol struct. */ | |
260 | ||
261 | struct symbol * | |
262 | syscm_get_valid_symbol_arg_unsafe (SCM self, int arg_pos, | |
263 | const char *func_name) | |
264 | { | |
265 | symbol_smob *s_smob = syscm_get_valid_symbol_smob_arg_unsafe (self, arg_pos, | |
266 | func_name); | |
267 | ||
268 | return s_smob->symbol; | |
269 | } | |
270 | ||
271 | /* Helper function for syscm_del_objfile_symbols to mark the symbol | |
272 | as invalid. */ | |
273 | ||
274 | static int | |
275 | syscm_mark_symbol_invalid (void **slot, void *info) | |
276 | { | |
277 | symbol_smob *s_smob = (symbol_smob *) *slot; | |
278 | ||
279 | s_smob->symbol = NULL; | |
280 | return 1; | |
281 | } | |
282 | ||
283 | /* This function is called when an objfile is about to be freed. | |
284 | Invalidate the symbol as further actions on the symbol would result | |
285 | in bad data. All access to s_smob->symbol should be gated by | |
286 | syscm_get_valid_symbol_smob_arg_unsafe which will raise an exception on | |
287 | invalid symbols. */ | |
288 | ||
289 | static void | |
290 | syscm_del_objfile_symbols (struct objfile *objfile, void *datum) | |
291 | { | |
292 | htab_t htab = datum; | |
293 | ||
294 | if (htab != NULL) | |
295 | { | |
296 | htab_traverse_noresize (htab, syscm_mark_symbol_invalid, NULL); | |
297 | htab_delete (htab); | |
298 | } | |
299 | } | |
300 | \f | |
301 | /* Symbol methods. */ | |
302 | ||
303 | /* (symbol-valid? <gdb:symbol>) -> boolean | |
304 | Returns #t if SELF still exists in GDB. */ | |
305 | ||
306 | static SCM | |
307 | gdbscm_symbol_valid_p (SCM self) | |
308 | { | |
309 | symbol_smob *s_smob | |
310 | = syscm_get_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
311 | ||
312 | return scm_from_bool (syscm_is_valid (s_smob)); | |
313 | } | |
314 | ||
315 | /* (symbol-type <gdb:symbol>) -> <gdb:type> | |
316 | Return the type of SELF, or #f if SELF has no type. */ | |
317 | ||
318 | static SCM | |
319 | gdbscm_symbol_type (SCM self) | |
320 | { | |
321 | symbol_smob *s_smob | |
322 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
323 | const struct symbol *symbol = s_smob->symbol; | |
324 | ||
325 | if (SYMBOL_TYPE (symbol) == NULL) | |
326 | return SCM_BOOL_F; | |
327 | ||
328 | return tyscm_scm_from_type (SYMBOL_TYPE (symbol)); | |
329 | } | |
330 | ||
331 | /* (symbol-symtab <gdb:symbol>) -> <gdb:symtab> | |
332 | Return the symbol table of SELF. */ | |
333 | ||
334 | static SCM | |
335 | gdbscm_symbol_symtab (SCM self) | |
336 | { | |
337 | symbol_smob *s_smob | |
338 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
339 | const struct symbol *symbol = s_smob->symbol; | |
340 | ||
341 | return stscm_scm_from_symtab (SYMBOL_SYMTAB (symbol)); | |
342 | } | |
343 | ||
344 | /* (symbol-name <gdb:symbol>) -> string */ | |
345 | ||
346 | static SCM | |
347 | gdbscm_symbol_name (SCM self) | |
348 | { | |
349 | symbol_smob *s_smob | |
350 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
351 | const struct symbol *symbol = s_smob->symbol; | |
352 | ||
353 | return gdbscm_scm_from_c_string (SYMBOL_NATURAL_NAME (symbol)); | |
354 | } | |
355 | ||
356 | /* (symbol-linkage-name <gdb:symbol>) -> string */ | |
357 | ||
358 | static SCM | |
359 | gdbscm_symbol_linkage_name (SCM self) | |
360 | { | |
361 | symbol_smob *s_smob | |
362 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
363 | const struct symbol *symbol = s_smob->symbol; | |
364 | ||
365 | return gdbscm_scm_from_c_string (SYMBOL_LINKAGE_NAME (symbol)); | |
366 | } | |
367 | ||
368 | /* (symbol-print-name <gdb:symbol>) -> string */ | |
369 | ||
370 | static SCM | |
371 | gdbscm_symbol_print_name (SCM self) | |
372 | { | |
373 | symbol_smob *s_smob | |
374 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
375 | const struct symbol *symbol = s_smob->symbol; | |
376 | ||
377 | return gdbscm_scm_from_c_string (SYMBOL_PRINT_NAME (symbol)); | |
378 | } | |
379 | ||
380 | /* (symbol-addr-class <gdb:symbol>) -> integer */ | |
381 | ||
382 | static SCM | |
383 | gdbscm_symbol_addr_class (SCM self) | |
384 | { | |
385 | symbol_smob *s_smob | |
386 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
387 | const struct symbol *symbol = s_smob->symbol; | |
388 | ||
389 | return scm_from_int (SYMBOL_CLASS (symbol)); | |
390 | } | |
391 | ||
392 | /* (symbol-argument? <gdb:symbol>) -> boolean */ | |
393 | ||
394 | static SCM | |
395 | gdbscm_symbol_argument_p (SCM self) | |
396 | { | |
397 | symbol_smob *s_smob | |
398 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
399 | const struct symbol *symbol = s_smob->symbol; | |
400 | ||
401 | return scm_from_bool (SYMBOL_IS_ARGUMENT (symbol)); | |
402 | } | |
403 | ||
404 | /* (symbol-constant? <gdb:symbol>) -> boolean */ | |
405 | ||
406 | static SCM | |
407 | gdbscm_symbol_constant_p (SCM self) | |
408 | { | |
409 | symbol_smob *s_smob | |
410 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
411 | const struct symbol *symbol = s_smob->symbol; | |
412 | enum address_class class; | |
413 | ||
414 | class = SYMBOL_CLASS (symbol); | |
415 | ||
416 | return scm_from_bool (class == LOC_CONST || class == LOC_CONST_BYTES); | |
417 | } | |
418 | ||
419 | /* (symbol-function? <gdb:symbol>) -> boolean */ | |
420 | ||
421 | static SCM | |
422 | gdbscm_symbol_function_p (SCM self) | |
423 | { | |
424 | symbol_smob *s_smob | |
425 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
426 | const struct symbol *symbol = s_smob->symbol; | |
427 | enum address_class class; | |
428 | ||
429 | class = SYMBOL_CLASS (symbol); | |
430 | ||
431 | return scm_from_bool (class == LOC_BLOCK); | |
432 | } | |
433 | ||
434 | /* (symbol-variable? <gdb:symbol>) -> boolean */ | |
435 | ||
436 | static SCM | |
437 | gdbscm_symbol_variable_p (SCM self) | |
438 | { | |
439 | symbol_smob *s_smob | |
440 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
441 | const struct symbol *symbol = s_smob->symbol; | |
442 | enum address_class class; | |
443 | ||
444 | class = SYMBOL_CLASS (symbol); | |
445 | ||
446 | return scm_from_bool (!SYMBOL_IS_ARGUMENT (symbol) | |
447 | && (class == LOC_LOCAL || class == LOC_REGISTER | |
448 | || class == LOC_STATIC || class == LOC_COMPUTED | |
449 | || class == LOC_OPTIMIZED_OUT)); | |
450 | } | |
451 | ||
452 | /* (symbol-needs-frame? <gdb:symbol>) -> boolean | |
453 | Return #t if the symbol needs a frame for evaluation. */ | |
454 | ||
455 | static SCM | |
456 | gdbscm_symbol_needs_frame_p (SCM self) | |
457 | { | |
458 | symbol_smob *s_smob | |
459 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
460 | struct symbol *symbol = s_smob->symbol; | |
461 | volatile struct gdb_exception except; | |
462 | int result = 0; | |
463 | ||
464 | TRY_CATCH (except, RETURN_MASK_ALL) | |
465 | { | |
466 | result = symbol_read_needs_frame (symbol); | |
467 | } | |
468 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
469 | ||
470 | return scm_from_bool (result); | |
471 | } | |
472 | ||
473 | /* (symbol-line <gdb:symbol>) -> integer | |
474 | Return the line number at which the symbol was defined. */ | |
475 | ||
476 | static SCM | |
477 | gdbscm_symbol_line (SCM self) | |
478 | { | |
479 | symbol_smob *s_smob | |
480 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
481 | const struct symbol *symbol = s_smob->symbol; | |
482 | ||
483 | return scm_from_int (SYMBOL_LINE (symbol)); | |
484 | } | |
485 | ||
486 | /* (symbol-value <gdb:symbol> [#:frame <gdb:frame>]) -> <gdb:value> | |
487 | Return the value of the symbol, or an error in various circumstances. */ | |
488 | ||
489 | static SCM | |
490 | gdbscm_symbol_value (SCM self, SCM rest) | |
491 | { | |
492 | symbol_smob *s_smob | |
493 | = syscm_get_valid_symbol_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
494 | struct symbol *symbol = s_smob->symbol; | |
495 | SCM keywords[] = { frame_keyword, SCM_BOOL_F }; | |
496 | int frame_pos = -1; | |
497 | SCM frame_scm = SCM_BOOL_F; | |
498 | frame_smob *f_smob = NULL; | |
499 | struct frame_info *frame_info = NULL; | |
500 | struct value *value = NULL; | |
501 | volatile struct gdb_exception except; | |
502 | ||
503 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, keywords, "#O", | |
504 | rest, &frame_pos, &frame_scm); | |
505 | if (!gdbscm_is_false (frame_scm)) | |
506 | f_smob = frscm_get_frame_smob_arg_unsafe (frame_scm, frame_pos, FUNC_NAME); | |
507 | ||
508 | if (SYMBOL_CLASS (symbol) == LOC_TYPEDEF) | |
509 | { | |
510 | gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG1, self, | |
511 | _("cannot get the value of a typedef")); | |
512 | } | |
513 | ||
514 | TRY_CATCH (except, RETURN_MASK_ALL) | |
515 | { | |
516 | if (f_smob != NULL) | |
517 | { | |
518 | frame_info = frscm_frame_smob_to_frame (f_smob); | |
519 | if (frame_info == NULL) | |
520 | error (_("Invalid frame")); | |
521 | } | |
522 | ||
523 | if (symbol_read_needs_frame (symbol) && frame_info == NULL) | |
524 | error (_("Symbol requires a frame to compute its value")); | |
525 | ||
526 | value = read_var_value (symbol, frame_info); | |
527 | } | |
528 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
529 | ||
530 | return vlscm_scm_from_value (value); | |
531 | } | |
532 | \f | |
533 | /* (lookup-symbol name [#:block <gdb:block>] [#:domain domain]) | |
534 | -> (<gdb:symbol> field-of-this?) | |
535 | The result is #f if the symbol is not found. | |
536 | See comment in lookup_symbol_in_language for field-of-this?. */ | |
537 | ||
538 | static SCM | |
539 | gdbscm_lookup_symbol (SCM name_scm, SCM rest) | |
540 | { | |
541 | char *name; | |
542 | SCM keywords[] = { block_keyword, domain_keyword, SCM_BOOL_F }; | |
543 | const struct block *block = NULL; | |
544 | SCM block_scm = SCM_BOOL_F; | |
545 | int domain = VAR_DOMAIN; | |
546 | int block_arg_pos = -1, domain_arg_pos = -1; | |
547 | struct field_of_this_result is_a_field_of_this; | |
548 | struct symbol *symbol = NULL; | |
549 | volatile struct gdb_exception except; | |
550 | struct cleanup *cleanups; | |
551 | ||
552 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, keywords, "s#Oi", | |
553 | name_scm, &name, rest, | |
554 | &block_arg_pos, &block_scm, | |
555 | &domain_arg_pos, &domain); | |
556 | ||
557 | cleanups = make_cleanup (xfree, name); | |
558 | ||
559 | if (block_arg_pos >= 0) | |
560 | { | |
561 | SCM except_scm; | |
562 | ||
563 | block = bkscm_scm_to_block (block_scm, block_arg_pos, FUNC_NAME, | |
564 | &except_scm); | |
565 | if (block == NULL) | |
566 | { | |
567 | do_cleanups (cleanups); | |
568 | gdbscm_throw (except_scm); | |
569 | } | |
570 | } | |
571 | else | |
572 | { | |
573 | struct frame_info *selected_frame; | |
574 | ||
575 | TRY_CATCH (except, RETURN_MASK_ALL) | |
576 | { | |
577 | selected_frame = get_selected_frame (_("no frame selected")); | |
578 | block = get_frame_block (selected_frame, NULL); | |
579 | } | |
580 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
581 | } | |
582 | ||
583 | TRY_CATCH (except, RETURN_MASK_ALL) | |
584 | { | |
585 | symbol = lookup_symbol (name, block, domain, &is_a_field_of_this); | |
586 | } | |
587 | do_cleanups (cleanups); | |
588 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
589 | ||
590 | if (symbol == NULL) | |
591 | return SCM_BOOL_F; | |
592 | ||
593 | return scm_list_2 (syscm_scm_from_symbol (symbol), | |
594 | scm_from_bool (is_a_field_of_this.type != NULL)); | |
595 | } | |
596 | ||
597 | /* (lookup-global-symbol name [#:domain domain]) -> <gdb:symbol> | |
598 | The result is #f if the symbol is not found. */ | |
599 | ||
600 | static SCM | |
601 | gdbscm_lookup_global_symbol (SCM name_scm, SCM rest) | |
602 | { | |
603 | char *name; | |
604 | SCM keywords[] = { domain_keyword, SCM_BOOL_F }; | |
605 | int domain_arg_pos = -1; | |
606 | int domain = VAR_DOMAIN; | |
607 | struct symbol *symbol = NULL; | |
608 | volatile struct gdb_exception except; | |
609 | struct cleanup *cleanups; | |
610 | ||
611 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, keywords, "s#i", | |
612 | name_scm, &name, rest, | |
613 | &domain_arg_pos, &domain); | |
614 | ||
615 | cleanups = make_cleanup (xfree, name); | |
616 | ||
617 | TRY_CATCH (except, RETURN_MASK_ALL) | |
618 | { | |
619 | symbol = lookup_symbol_global (name, NULL, domain); | |
620 | } | |
621 | do_cleanups (cleanups); | |
622 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
623 | ||
624 | if (symbol == NULL) | |
625 | return SCM_BOOL_F; | |
626 | ||
627 | return syscm_scm_from_symbol (symbol); | |
628 | } | |
629 | \f | |
630 | /* Initialize the Scheme symbol support. */ | |
631 | ||
632 | /* Note: The SYMBOL_ prefix on the integer constants here is present for | |
633 | compatibility with the Python support. */ | |
634 | ||
635 | static const scheme_integer_constant symbol_integer_constants[] = | |
636 | { | |
637 | #define X(SYM) { "SYMBOL_" #SYM, SYM } | |
638 | X (LOC_UNDEF), | |
639 | X (LOC_CONST), | |
640 | X (LOC_STATIC), | |
641 | X (LOC_REGISTER), | |
642 | X (LOC_ARG), | |
643 | X (LOC_REF_ARG), | |
644 | X (LOC_LOCAL), | |
645 | X (LOC_TYPEDEF), | |
646 | X (LOC_LABEL), | |
647 | X (LOC_BLOCK), | |
648 | X (LOC_CONST_BYTES), | |
649 | X (LOC_UNRESOLVED), | |
650 | X (LOC_OPTIMIZED_OUT), | |
651 | X (LOC_COMPUTED), | |
652 | X (LOC_REGPARM_ADDR), | |
653 | ||
654 | X (UNDEF_DOMAIN), | |
655 | X (VAR_DOMAIN), | |
656 | X (STRUCT_DOMAIN), | |
657 | X (LABEL_DOMAIN), | |
658 | X (VARIABLES_DOMAIN), | |
659 | X (FUNCTIONS_DOMAIN), | |
660 | X (TYPES_DOMAIN), | |
661 | #undef X | |
662 | ||
663 | END_INTEGER_CONSTANTS | |
664 | }; | |
665 | ||
666 | static const scheme_function symbol_functions[] = | |
667 | { | |
668 | { "symbol?", 1, 0, 0, gdbscm_symbol_p, | |
669 | "\ | |
670 | Return #t if the object is a <gdb:symbol> object." }, | |
671 | ||
672 | { "symbol-valid?", 1, 0, 0, gdbscm_symbol_valid_p, | |
673 | "\ | |
674 | Return #t if object is a valid <gdb:symbol> object.\n\ | |
675 | A valid symbol is a symbol that has not been freed.\n\ | |
676 | Symbols are freed when the objfile they come from is freed." }, | |
677 | ||
678 | { "symbol-type", 1, 0, 0, gdbscm_symbol_type, | |
679 | "\ | |
680 | Return the type of symbol." }, | |
681 | ||
682 | { "symbol-symtab", 1, 0, 0, gdbscm_symbol_symtab, | |
683 | "\ | |
684 | Return the symbol table (<gdb:symtab>) containing symbol." }, | |
685 | ||
686 | { "symbol-line", 1, 0, 0, gdbscm_symbol_line, | |
687 | "\ | |
688 | Return the line number at which the symbol was defined." }, | |
689 | ||
690 | { "symbol-name", 1, 0, 0, gdbscm_symbol_name, | |
691 | "\ | |
692 | Return the name of the symbol as a string." }, | |
693 | ||
694 | { "symbol-linkage-name", 1, 0, 0, gdbscm_symbol_linkage_name, | |
695 | "\ | |
696 | Return the linkage name of the symbol as a string." }, | |
697 | ||
698 | { "symbol-print-name", 1, 0, 0, gdbscm_symbol_print_name, | |
699 | "\ | |
700 | Return the print name of the symbol as a string.\n\ | |
701 | This is either name or linkage-name, depending on whether the user\n\ | |
702 | asked GDB to display demangled or mangled names." }, | |
703 | ||
704 | { "symbol-addr-class", 1, 0, 0, gdbscm_symbol_addr_class, | |
705 | "\ | |
706 | Return the address class of the symbol." }, | |
707 | ||
708 | { "symbol-needs-frame?", 1, 0, 0, gdbscm_symbol_needs_frame_p, | |
709 | "\ | |
710 | Return #t if the symbol needs a frame to compute its value." }, | |
711 | ||
712 | { "symbol-argument?", 1, 0, 0, gdbscm_symbol_argument_p, | |
713 | "\ | |
714 | Return #t if the symbol is a function argument." }, | |
715 | ||
716 | { "symbol-constant?", 1, 0, 0, gdbscm_symbol_constant_p, | |
717 | "\ | |
718 | Return #t if the symbol is a constant." }, | |
719 | ||
720 | { "symbol-function?", 1, 0, 0, gdbscm_symbol_function_p, | |
721 | "\ | |
722 | Return #t if the symbol is a function." }, | |
723 | ||
724 | { "symbol-variable?", 1, 0, 0, gdbscm_symbol_variable_p, | |
725 | "\ | |
726 | Return #t if the symbol is a variable." }, | |
727 | ||
728 | { "symbol-value", 1, 0, 1, gdbscm_symbol_value, | |
729 | "\ | |
730 | Return the value of the symbol.\n\ | |
731 | \n\ | |
732 | Arguments: <gdb:symbol> [#:frame frame]" }, | |
733 | ||
734 | { "lookup-symbol", 1, 0, 1, gdbscm_lookup_symbol, | |
735 | "\ | |
736 | Return (<gdb:symbol> field-of-this?) if found, otherwise #f.\n\ | |
737 | \n\ | |
738 | Arguments: name [#:block block] [#:domain domain]\n\ | |
739 | name: a string containing the name of the symbol to lookup\n\ | |
740 | block: a <gdb:block> object\n\ | |
741 | domain: a SYMBOL_*_DOMAIN value" }, | |
742 | ||
743 | { "lookup-global-symbol", 1, 0, 1, gdbscm_lookup_global_symbol, | |
744 | "\ | |
745 | Return <gdb:symbol> if found, otherwise #f.\n\ | |
746 | \n\ | |
747 | Arguments: name [#:domain domain]\n\ | |
748 | name: a string containing the name of the symbol to lookup\n\ | |
749 | domain: a SYMBOL_*_DOMAIN value" }, | |
750 | ||
751 | END_FUNCTIONS | |
752 | }; | |
753 | ||
754 | void | |
755 | gdbscm_initialize_symbols (void) | |
756 | { | |
757 | symbol_smob_tag | |
758 | = gdbscm_make_smob_type (symbol_smob_name, sizeof (symbol_smob)); | |
759 | scm_set_smob_mark (symbol_smob_tag, syscm_mark_symbol_smob); | |
760 | scm_set_smob_free (symbol_smob_tag, syscm_free_symbol_smob); | |
761 | scm_set_smob_print (symbol_smob_tag, syscm_print_symbol_smob); | |
762 | ||
763 | gdbscm_define_integer_constants (symbol_integer_constants, 1); | |
764 | gdbscm_define_functions (symbol_functions, 1); | |
765 | ||
766 | block_keyword = scm_from_latin1_keyword ("block"); | |
767 | domain_keyword = scm_from_latin1_keyword ("domain"); | |
768 | frame_keyword = scm_from_latin1_keyword ("frame"); | |
769 | ||
770 | /* Register an objfile "free" callback so we can properly | |
771 | invalidate symbols when an object file is about to be deleted. */ | |
772 | syscm_objfile_data_key | |
773 | = register_objfile_data_with_cleanup (NULL, syscm_del_objfile_symbols); | |
774 | } |