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ed3ef339 DE |
1 | /* Scheme interface to values. |
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 "arch-utils.h" | |
25 | #include "charset.h" | |
26 | #include "cp-abi.h" | |
27 | #include "gdb_assert.h" | |
28 | #include "infcall.h" | |
29 | #include "symtab.h" /* Needed by language.h. */ | |
30 | #include "language.h" | |
31 | #include "valprint.h" | |
32 | #include "value.h" | |
33 | #include "guile-internal.h" | |
34 | ||
35 | /* The <gdb:value> smob. */ | |
36 | ||
37 | typedef struct _value_smob | |
38 | { | |
39 | /* This always appears first. */ | |
40 | gdb_smob base; | |
41 | ||
42 | /* Doubly linked list of values in values_in_scheme. | |
43 | IWBN to use a chained_gdb_smob instead, which is doable, it just requires | |
44 | a bit more casting than normal. */ | |
45 | struct _value_smob *next; | |
46 | struct _value_smob *prev; | |
47 | ||
48 | struct value *value; | |
49 | ||
50 | /* These are cached here to avoid making multiple copies of them. | |
51 | Plus computing the dynamic_type can be a bit expensive. | |
52 | We use #f to indicate that the value doesn't exist (e.g. value doesn't | |
53 | have an address), so we need another value to indicate that we haven't | |
54 | computed the value yet. For this we use SCM_UNDEFINED. */ | |
55 | SCM address; | |
56 | SCM type; | |
57 | SCM dynamic_type; | |
58 | } value_smob; | |
59 | ||
60 | static const char value_smob_name[] = "gdb:value"; | |
61 | ||
62 | /* The tag Guile knows the value smob by. */ | |
63 | static scm_t_bits value_smob_tag; | |
64 | ||
65 | /* List of all values which are currently exposed to Scheme. It is | |
66 | maintained so that when an objfile is discarded, preserve_values | |
67 | can copy the values' types if needed. */ | |
68 | static value_smob *values_in_scheme; | |
69 | ||
70 | /* Keywords used by Scheme procedures in this file. */ | |
71 | static SCM type_keyword; | |
72 | static SCM encoding_keyword; | |
73 | static SCM errors_keyword; | |
74 | static SCM length_keyword; | |
75 | ||
76 | /* Possible #:errors values. */ | |
77 | static SCM error_symbol; | |
78 | static SCM escape_symbol; | |
79 | static SCM substitute_symbol; | |
80 | \f | |
81 | /* Administrivia for value smobs. */ | |
82 | ||
83 | /* Iterate over all the <gdb:value> objects, calling preserve_one_value on | |
84 | each. | |
85 | This is the extension_language_ops.preserve_values "method". */ | |
86 | ||
87 | void | |
88 | gdbscm_preserve_values (const struct extension_language_defn *extlang, | |
89 | struct objfile *objfile, htab_t copied_types) | |
90 | { | |
91 | value_smob *iter; | |
92 | ||
93 | for (iter = values_in_scheme; iter; iter = iter->next) | |
94 | preserve_one_value (iter->value, objfile, copied_types); | |
95 | } | |
96 | ||
97 | /* Helper to add a value_smob to the global list. */ | |
98 | ||
99 | static void | |
100 | vlscm_remember_scheme_value (value_smob *v_smob) | |
101 | { | |
102 | v_smob->next = values_in_scheme; | |
103 | if (v_smob->next) | |
104 | v_smob->next->prev = v_smob; | |
105 | v_smob->prev = NULL; | |
106 | values_in_scheme = v_smob; | |
107 | } | |
108 | ||
109 | /* Helper to remove a value_smob from the global list. */ | |
110 | ||
111 | static void | |
112 | vlscm_forget_value_smob (value_smob *v_smob) | |
113 | { | |
114 | /* Remove SELF from the global list. */ | |
115 | if (v_smob->prev) | |
116 | v_smob->prev->next = v_smob->next; | |
117 | else | |
118 | { | |
119 | gdb_assert (values_in_scheme == v_smob); | |
120 | values_in_scheme = v_smob->next; | |
121 | } | |
122 | if (v_smob->next) | |
123 | v_smob->next->prev = v_smob->prev; | |
124 | } | |
125 | ||
ed3ef339 DE |
126 | /* The smob "free" function for <gdb:value>. */ |
127 | ||
128 | static size_t | |
129 | vlscm_free_value_smob (SCM self) | |
130 | { | |
131 | value_smob *v_smob = (value_smob *) SCM_SMOB_DATA (self); | |
132 | ||
133 | vlscm_forget_value_smob (v_smob); | |
134 | value_free (v_smob->value); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | /* The smob "print" function for <gdb:value>. */ | |
140 | ||
141 | static int | |
142 | vlscm_print_value_smob (SCM self, SCM port, scm_print_state *pstate) | |
143 | { | |
144 | value_smob *v_smob = (value_smob *) SCM_SMOB_DATA (self); | |
145 | char *s = NULL; | |
146 | struct value_print_options opts; | |
147 | volatile struct gdb_exception except; | |
148 | ||
149 | if (pstate->writingp) | |
150 | gdbscm_printf (port, "#<%s ", value_smob_name); | |
151 | ||
152 | get_user_print_options (&opts); | |
153 | opts.deref_ref = 0; | |
154 | ||
155 | /* pstate->writingp = zero if invoked by display/~A, and nonzero if | |
156 | invoked by write/~S. What to do here may need to evolve. | |
157 | IWBN if we could pass an argument to format that would we could use | |
158 | instead of writingp. */ | |
159 | opts.raw = !!pstate->writingp; | |
160 | ||
161 | TRY_CATCH (except, RETURN_MASK_ALL) | |
162 | { | |
163 | struct ui_file *stb = mem_fileopen (); | |
164 | struct cleanup *old_chain = make_cleanup_ui_file_delete (stb); | |
165 | ||
166 | common_val_print (v_smob->value, stb, 0, &opts, current_language); | |
167 | s = ui_file_xstrdup (stb, NULL); | |
168 | ||
169 | do_cleanups (old_chain); | |
170 | } | |
171 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
172 | ||
173 | if (s != NULL) | |
174 | { | |
175 | scm_puts (s, port); | |
176 | xfree (s); | |
177 | } | |
178 | ||
179 | if (pstate->writingp) | |
180 | scm_puts (">", port); | |
181 | ||
182 | scm_remember_upto_here_1 (self); | |
183 | ||
184 | /* Non-zero means success. */ | |
185 | return 1; | |
186 | } | |
187 | ||
188 | /* The smob "equalp" function for <gdb:value>. */ | |
189 | ||
190 | static SCM | |
191 | vlscm_equal_p_value_smob (SCM v1, SCM v2) | |
192 | { | |
193 | const value_smob *v1_smob = (value_smob *) SCM_SMOB_DATA (v1); | |
194 | const value_smob *v2_smob = (value_smob *) SCM_SMOB_DATA (v2); | |
195 | int result = 0; | |
196 | volatile struct gdb_exception except; | |
197 | ||
198 | TRY_CATCH (except, RETURN_MASK_ALL) | |
199 | { | |
200 | result = value_equal (v1_smob->value, v2_smob->value); | |
201 | } | |
202 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
203 | ||
204 | return scm_from_bool (result); | |
205 | } | |
206 | ||
207 | /* Low level routine to create a <gdb:value> object. */ | |
208 | ||
209 | static SCM | |
210 | vlscm_make_value_smob (void) | |
211 | { | |
212 | value_smob *v_smob = (value_smob *) | |
213 | scm_gc_malloc (sizeof (value_smob), value_smob_name); | |
214 | SCM v_scm; | |
215 | ||
216 | /* These must be filled in by the caller. */ | |
217 | v_smob->value = NULL; | |
218 | v_smob->prev = NULL; | |
219 | v_smob->next = NULL; | |
220 | ||
221 | /* These are lazily computed. */ | |
222 | v_smob->address = SCM_UNDEFINED; | |
223 | v_smob->type = SCM_UNDEFINED; | |
224 | v_smob->dynamic_type = SCM_UNDEFINED; | |
225 | ||
226 | v_scm = scm_new_smob (value_smob_tag, (scm_t_bits) v_smob); | |
227 | gdbscm_init_gsmob (&v_smob->base); | |
228 | ||
229 | return v_scm; | |
230 | } | |
231 | ||
232 | /* Return non-zero if SCM is a <gdb:value> object. */ | |
233 | ||
234 | int | |
235 | vlscm_is_value (SCM scm) | |
236 | { | |
237 | return SCM_SMOB_PREDICATE (value_smob_tag, scm); | |
238 | } | |
239 | ||
240 | /* (value? object) -> boolean */ | |
241 | ||
242 | static SCM | |
243 | gdbscm_value_p (SCM scm) | |
244 | { | |
245 | return scm_from_bool (vlscm_is_value (scm)); | |
246 | } | |
247 | ||
248 | /* Create a new <gdb:value> object that encapsulates VALUE. | |
249 | The value is released from the all_values chain so its lifetime is not | |
250 | bound to the execution of a command. */ | |
251 | ||
252 | SCM | |
253 | vlscm_scm_from_value (struct value *value) | |
254 | { | |
255 | /* N.B. It's important to not cause any side-effects until we know the | |
256 | conversion worked. */ | |
257 | SCM v_scm = vlscm_make_value_smob (); | |
258 | value_smob *v_smob = (value_smob *) SCM_SMOB_DATA (v_scm); | |
259 | ||
260 | v_smob->value = value; | |
261 | release_value_or_incref (value); | |
262 | vlscm_remember_scheme_value (v_smob); | |
263 | ||
264 | return v_scm; | |
265 | } | |
266 | ||
267 | /* Returns the <gdb:value> object in SELF. | |
268 | Throws an exception if SELF is not a <gdb:value> object. */ | |
269 | ||
270 | static SCM | |
271 | vlscm_get_value_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
272 | { | |
273 | SCM_ASSERT_TYPE (vlscm_is_value (self), self, arg_pos, func_name, | |
274 | value_smob_name); | |
275 | ||
276 | return self; | |
277 | } | |
278 | ||
279 | /* Returns a pointer to the value smob of SELF. | |
280 | Throws an exception if SELF is not a <gdb:value> object. */ | |
281 | ||
282 | static value_smob * | |
283 | vlscm_get_value_smob_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
284 | { | |
285 | SCM v_scm = vlscm_get_value_arg_unsafe (self, arg_pos, func_name); | |
286 | value_smob *v_smob = (value_smob *) SCM_SMOB_DATA (v_scm); | |
287 | ||
288 | return v_smob; | |
289 | } | |
290 | ||
291 | /* Return the value field of V_SCM, an object of type <gdb:value>. | |
292 | This exists so that we don't have to export the struct's contents. */ | |
293 | ||
294 | struct value * | |
295 | vlscm_scm_to_value (SCM v_scm) | |
296 | { | |
297 | value_smob *v_smob; | |
298 | ||
299 | gdb_assert (vlscm_is_value (v_scm)); | |
300 | v_smob = (value_smob *) SCM_SMOB_DATA (v_scm); | |
301 | return v_smob->value; | |
302 | } | |
303 | \f | |
304 | /* Value methods. */ | |
305 | ||
306 | /* (make-value x [#:type type]) -> <gdb:value> */ | |
307 | ||
308 | static SCM | |
309 | gdbscm_make_value (SCM x, SCM rest) | |
310 | { | |
311 | struct gdbarch *gdbarch = get_current_arch (); | |
312 | const struct language_defn *language = current_language; | |
313 | const SCM keywords[] = { type_keyword, SCM_BOOL_F }; | |
314 | int type_arg_pos = -1; | |
315 | SCM type_scm = SCM_UNDEFINED; | |
316 | SCM except_scm, result; | |
317 | type_smob *t_smob; | |
318 | struct type *type = NULL; | |
319 | struct value *value; | |
320 | struct cleanup *cleanups; | |
321 | ||
322 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, keywords, "#O", rest, | |
323 | &type_arg_pos, &type_scm); | |
324 | ||
325 | if (type_arg_pos > 0) | |
326 | { | |
327 | t_smob = tyscm_get_type_smob_arg_unsafe (type_scm, type_arg_pos, | |
328 | FUNC_NAME); | |
329 | type = tyscm_type_smob_type (t_smob); | |
330 | } | |
331 | ||
332 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
333 | ||
334 | value = vlscm_convert_typed_value_from_scheme (FUNC_NAME, SCM_ARG1, x, | |
335 | type_arg_pos, type_scm, type, | |
336 | &except_scm, | |
337 | gdbarch, language); | |
338 | if (value == NULL) | |
339 | { | |
340 | do_cleanups (cleanups); | |
341 | gdbscm_throw (except_scm); | |
342 | } | |
343 | ||
344 | result = vlscm_scm_from_value (value); | |
345 | ||
346 | do_cleanups (cleanups); | |
347 | ||
348 | if (gdbscm_is_exception (result)) | |
349 | gdbscm_throw (result); | |
350 | return result; | |
351 | } | |
352 | ||
353 | /* (make-lazy-value <gdb:type> address) -> <gdb:value> */ | |
354 | ||
355 | static SCM | |
356 | gdbscm_make_lazy_value (SCM type_scm, SCM address_scm) | |
357 | { | |
358 | type_smob *t_smob; | |
359 | struct type *type; | |
360 | ULONGEST address; | |
361 | struct value *value = NULL; | |
362 | SCM result; | |
363 | struct cleanup *cleanups; | |
364 | volatile struct gdb_exception except; | |
365 | ||
366 | t_smob = tyscm_get_type_smob_arg_unsafe (type_scm, SCM_ARG1, FUNC_NAME); | |
367 | type = tyscm_type_smob_type (t_smob); | |
368 | ||
369 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, NULL, "U", | |
370 | address_scm, &address); | |
371 | ||
372 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
373 | ||
374 | /* There's no (current) need to wrap this in a TRY_CATCH, but for consistency | |
375 | and future-proofing we do. */ | |
376 | TRY_CATCH (except, RETURN_MASK_ALL) | |
377 | { | |
378 | value = value_from_contents_and_address (type, NULL, address); | |
379 | } | |
380 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
381 | ||
382 | result = vlscm_scm_from_value (value); | |
383 | ||
384 | do_cleanups (cleanups); | |
385 | ||
386 | if (gdbscm_is_exception (result)) | |
387 | gdbscm_throw (result); | |
388 | return result; | |
389 | } | |
390 | ||
391 | /* (value-optimized-out? <gdb:value>) -> boolean */ | |
392 | ||
393 | static SCM | |
394 | gdbscm_value_optimized_out_p (SCM self) | |
395 | { | |
396 | value_smob *v_smob | |
397 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
398 | struct value *value = v_smob->value; | |
399 | int opt = 0; | |
400 | volatile struct gdb_exception except; | |
401 | ||
402 | TRY_CATCH (except, RETURN_MASK_ALL) | |
403 | { | |
404 | opt = value_optimized_out (value); | |
405 | } | |
406 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
407 | ||
408 | return scm_from_bool (opt); | |
409 | } | |
410 | ||
411 | /* (value-address <gdb:value>) -> integer | |
412 | Returns #f if the value doesn't have one. */ | |
413 | ||
414 | static SCM | |
415 | gdbscm_value_address (SCM self) | |
416 | { | |
417 | value_smob *v_smob | |
418 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
419 | struct value *value = v_smob->value; | |
420 | ||
421 | if (SCM_UNBNDP (v_smob->address)) | |
422 | { | |
423 | struct value *res_val = NULL; | |
424 | struct cleanup *cleanup | |
425 | = make_cleanup_value_free_to_mark (value_mark ()); | |
426 | SCM address; | |
427 | volatile struct gdb_exception except; | |
428 | ||
429 | TRY_CATCH (except, RETURN_MASK_ALL) | |
430 | { | |
431 | res_val = value_addr (value); | |
432 | } | |
433 | if (except.reason < 0) | |
434 | address = SCM_BOOL_F; | |
435 | else | |
436 | address = vlscm_scm_from_value (res_val); | |
437 | ||
438 | do_cleanups (cleanup); | |
439 | ||
440 | if (gdbscm_is_exception (address)) | |
441 | gdbscm_throw (address); | |
442 | ||
443 | v_smob->address = address; | |
444 | } | |
445 | ||
446 | return v_smob->address; | |
447 | } | |
448 | ||
449 | /* (value-dereference <gdb:value>) -> <gdb:value> | |
450 | Given a value of a pointer type, apply the C unary * operator to it. */ | |
451 | ||
452 | static SCM | |
453 | gdbscm_value_dereference (SCM self) | |
454 | { | |
455 | value_smob *v_smob | |
456 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
457 | struct value *value = v_smob->value; | |
458 | SCM result; | |
459 | struct value *res_val = NULL; | |
460 | struct cleanup *cleanups; | |
461 | volatile struct gdb_exception except; | |
462 | ||
463 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
464 | ||
465 | TRY_CATCH (except, RETURN_MASK_ALL) | |
466 | { | |
467 | res_val = value_ind (value); | |
468 | } | |
469 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
470 | ||
471 | result = vlscm_scm_from_value (res_val); | |
472 | ||
473 | do_cleanups (cleanups); | |
474 | ||
475 | if (gdbscm_is_exception (result)) | |
476 | gdbscm_throw (result); | |
477 | ||
478 | return result; | |
479 | } | |
480 | ||
481 | /* (value-referenced-value <gdb:value>) -> <gdb:value> | |
482 | Given a value of a reference type, return the value referenced. | |
483 | The difference between this function and gdbscm_value_dereference is that | |
484 | the latter applies * unary operator to a value, which need not always | |
485 | result in the value referenced. | |
486 | For example, for a value which is a reference to an 'int' pointer ('int *'), | |
487 | gdbscm_value_dereference will result in a value of type 'int' while | |
488 | gdbscm_value_referenced_value will result in a value of type 'int *'. */ | |
489 | ||
490 | static SCM | |
491 | gdbscm_value_referenced_value (SCM self) | |
492 | { | |
493 | value_smob *v_smob | |
494 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
495 | struct value *value = v_smob->value; | |
496 | SCM result; | |
497 | struct value *res_val = NULL; | |
498 | struct cleanup *cleanups; | |
499 | volatile struct gdb_exception except; | |
500 | ||
501 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
502 | ||
503 | TRY_CATCH (except, RETURN_MASK_ALL) | |
504 | { | |
505 | switch (TYPE_CODE (check_typedef (value_type (value)))) | |
506 | { | |
507 | case TYPE_CODE_PTR: | |
508 | res_val = value_ind (value); | |
509 | break; | |
510 | case TYPE_CODE_REF: | |
511 | res_val = coerce_ref (value); | |
512 | break; | |
513 | default: | |
514 | error (_("Trying to get the referenced value from a value which is" | |
515 | " neither a pointer nor a reference")); | |
516 | } | |
517 | } | |
518 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
519 | ||
520 | result = vlscm_scm_from_value (res_val); | |
521 | ||
522 | do_cleanups (cleanups); | |
523 | ||
524 | if (gdbscm_is_exception (result)) | |
525 | gdbscm_throw (result); | |
526 | ||
527 | return result; | |
528 | } | |
529 | ||
530 | /* (value-type <gdb:value>) -> <gdb:type> */ | |
531 | ||
532 | static SCM | |
533 | gdbscm_value_type (SCM self) | |
534 | { | |
535 | value_smob *v_smob | |
536 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
537 | struct value *value = v_smob->value; | |
538 | ||
539 | if (SCM_UNBNDP (v_smob->type)) | |
540 | v_smob->type = tyscm_scm_from_type (value_type (value)); | |
541 | ||
542 | return v_smob->type; | |
543 | } | |
544 | ||
545 | /* (value-dynamic-type <gdb:value>) -> <gdb:type> */ | |
546 | ||
547 | static SCM | |
548 | gdbscm_value_dynamic_type (SCM self) | |
549 | { | |
550 | value_smob *v_smob | |
551 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
552 | struct value *value = v_smob->value; | |
553 | struct type *type = NULL; | |
554 | volatile struct gdb_exception except; | |
555 | ||
556 | if (! SCM_UNBNDP (v_smob->type)) | |
557 | return v_smob->dynamic_type; | |
558 | ||
559 | TRY_CATCH (except, RETURN_MASK_ALL) | |
560 | { | |
561 | struct cleanup *cleanup | |
562 | = make_cleanup_value_free_to_mark (value_mark ()); | |
563 | ||
564 | type = value_type (value); | |
565 | CHECK_TYPEDEF (type); | |
566 | ||
567 | if (((TYPE_CODE (type) == TYPE_CODE_PTR) | |
568 | || (TYPE_CODE (type) == TYPE_CODE_REF)) | |
569 | && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS)) | |
570 | { | |
571 | struct value *target; | |
572 | int was_pointer = TYPE_CODE (type) == TYPE_CODE_PTR; | |
573 | ||
0be03e84 DE |
574 | if (was_pointer) |
575 | target = value_ind (value); | |
576 | else | |
577 | target = coerce_ref (value); | |
ed3ef339 DE |
578 | type = value_rtti_type (target, NULL, NULL, NULL); |
579 | ||
580 | if (type) | |
581 | { | |
582 | if (was_pointer) | |
583 | type = lookup_pointer_type (type); | |
584 | else | |
585 | type = lookup_reference_type (type); | |
586 | } | |
587 | } | |
588 | else if (TYPE_CODE (type) == TYPE_CODE_CLASS) | |
589 | type = value_rtti_type (value, NULL, NULL, NULL); | |
590 | else | |
591 | { | |
592 | /* Re-use object's static type. */ | |
593 | type = NULL; | |
594 | } | |
595 | ||
596 | do_cleanups (cleanup); | |
597 | } | |
598 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
599 | ||
600 | if (type == NULL) | |
601 | v_smob->dynamic_type = gdbscm_value_type (self); | |
602 | else | |
603 | v_smob->dynamic_type = tyscm_scm_from_type (type); | |
604 | ||
605 | return v_smob->dynamic_type; | |
606 | } | |
607 | ||
608 | /* A helper function that implements the various cast operators. */ | |
609 | ||
610 | static SCM | |
611 | vlscm_do_cast (SCM self, SCM type_scm, enum exp_opcode op, | |
612 | const char *func_name) | |
613 | { | |
614 | value_smob *v_smob | |
615 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
616 | struct value *value = v_smob->value; | |
617 | type_smob *t_smob | |
618 | = tyscm_get_type_smob_arg_unsafe (type_scm, SCM_ARG2, FUNC_NAME); | |
619 | struct type *type = tyscm_type_smob_type (t_smob); | |
620 | SCM result; | |
621 | struct value *res_val = NULL; | |
622 | struct cleanup *cleanups; | |
623 | volatile struct gdb_exception except; | |
624 | ||
625 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
626 | ||
627 | TRY_CATCH (except, RETURN_MASK_ALL) | |
628 | { | |
629 | if (op == UNOP_DYNAMIC_CAST) | |
630 | res_val = value_dynamic_cast (type, value); | |
631 | else if (op == UNOP_REINTERPRET_CAST) | |
632 | res_val = value_reinterpret_cast (type, value); | |
633 | else | |
634 | { | |
635 | gdb_assert (op == UNOP_CAST); | |
636 | res_val = value_cast (type, value); | |
637 | } | |
638 | } | |
639 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
640 | ||
641 | gdb_assert (res_val != NULL); | |
642 | result = vlscm_scm_from_value (res_val); | |
643 | ||
644 | do_cleanups (cleanups); | |
645 | ||
646 | if (gdbscm_is_exception (result)) | |
647 | gdbscm_throw (result); | |
648 | ||
649 | return result; | |
650 | } | |
651 | ||
652 | /* (value-cast <gdb:value> <gdb:type>) -> <gdb:value> */ | |
653 | ||
654 | static SCM | |
655 | gdbscm_value_cast (SCM self, SCM new_type) | |
656 | { | |
657 | return vlscm_do_cast (self, new_type, UNOP_CAST, FUNC_NAME); | |
658 | } | |
659 | ||
660 | /* (value-dynamic-cast <gdb:value> <gdb:type>) -> <gdb:value> */ | |
661 | ||
662 | static SCM | |
663 | gdbscm_value_dynamic_cast (SCM self, SCM new_type) | |
664 | { | |
665 | return vlscm_do_cast (self, new_type, UNOP_DYNAMIC_CAST, FUNC_NAME); | |
666 | } | |
667 | ||
668 | /* (value-reinterpret-cast <gdb:value> <gdb:type>) -> <gdb:value> */ | |
669 | ||
670 | static SCM | |
671 | gdbscm_value_reinterpret_cast (SCM self, SCM new_type) | |
672 | { | |
673 | return vlscm_do_cast (self, new_type, UNOP_REINTERPRET_CAST, FUNC_NAME); | |
674 | } | |
675 | ||
676 | /* (value-field <gdb:value> string) -> <gdb:value> | |
677 | Given string name of an element inside structure, return its <gdb:value> | |
678 | object. */ | |
679 | ||
680 | static SCM | |
681 | gdbscm_value_field (SCM self, SCM field_scm) | |
682 | { | |
683 | value_smob *v_smob | |
684 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
685 | struct value *value = v_smob->value; | |
686 | char *field = NULL; | |
687 | struct value *res_val = NULL; | |
688 | SCM result; | |
689 | struct cleanup *cleanups; | |
690 | volatile struct gdb_exception except; | |
691 | ||
692 | SCM_ASSERT_TYPE (scm_is_string (field_scm), field_scm, SCM_ARG2, FUNC_NAME, | |
693 | _("string")); | |
694 | ||
695 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
696 | ||
697 | field = gdbscm_scm_to_c_string (field_scm); | |
698 | make_cleanup (xfree, field); | |
699 | ||
700 | TRY_CATCH (except, RETURN_MASK_ALL) | |
701 | { | |
702 | struct value *tmp = value; | |
703 | ||
704 | res_val = value_struct_elt (&tmp, NULL, field, NULL, NULL); | |
705 | } | |
706 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
707 | ||
708 | gdb_assert (res_val != NULL); | |
709 | result = vlscm_scm_from_value (res_val); | |
710 | ||
711 | do_cleanups (cleanups); | |
712 | ||
713 | if (gdbscm_is_exception (result)) | |
714 | gdbscm_throw (result); | |
715 | ||
716 | return result; | |
717 | } | |
718 | ||
719 | /* (value-subscript <gdb:value> integer|<gdb:value>) -> <gdb:value> | |
720 | Return the specified value in an array. */ | |
721 | ||
722 | static SCM | |
723 | gdbscm_value_subscript (SCM self, SCM index_scm) | |
724 | { | |
725 | value_smob *v_smob | |
726 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
727 | struct value *value = v_smob->value; | |
728 | struct value *index = NULL; | |
729 | struct value *res_val = NULL; | |
730 | struct type *type = value_type (value); | |
731 | struct gdbarch *gdbarch; | |
732 | SCM result, except_scm; | |
733 | struct cleanup *cleanups; | |
734 | volatile struct gdb_exception except; | |
735 | ||
736 | /* The sequencing here, as everywhere else, is important. | |
737 | We can't have existing cleanups when a Scheme exception is thrown. */ | |
738 | ||
739 | SCM_ASSERT (type != NULL, self, SCM_ARG2, FUNC_NAME); | |
740 | gdbarch = get_type_arch (type); | |
741 | ||
742 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
743 | ||
744 | index = vlscm_convert_value_from_scheme (FUNC_NAME, SCM_ARG2, index_scm, | |
745 | &except_scm, | |
746 | gdbarch, current_language); | |
747 | if (index == NULL) | |
748 | { | |
749 | do_cleanups (cleanups); | |
750 | gdbscm_throw (except_scm); | |
751 | } | |
752 | ||
753 | TRY_CATCH (except, RETURN_MASK_ALL) | |
754 | { | |
755 | struct value *tmp = value; | |
756 | ||
757 | /* Assume we are attempting an array access, and let the value code | |
758 | throw an exception if the index has an invalid type. | |
759 | Check the value's type is something that can be accessed via | |
760 | a subscript. */ | |
761 | tmp = coerce_ref (tmp); | |
762 | type = check_typedef (value_type (tmp)); | |
763 | if (TYPE_CODE (type) != TYPE_CODE_ARRAY | |
764 | && TYPE_CODE (type) != TYPE_CODE_PTR) | |
765 | error (_("Cannot subscript requested type")); | |
766 | ||
767 | res_val = value_subscript (tmp, value_as_long (index)); | |
768 | } | |
769 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
770 | ||
771 | gdb_assert (res_val != NULL); | |
772 | result = vlscm_scm_from_value (res_val); | |
773 | ||
774 | do_cleanups (cleanups); | |
775 | ||
776 | if (gdbscm_is_exception (result)) | |
777 | gdbscm_throw (result); | |
778 | ||
779 | return result; | |
780 | } | |
781 | ||
782 | /* (value-call <gdb:value> arg-list) -> <gdb:value> | |
783 | Perform an inferior function call on the value. */ | |
784 | ||
785 | static SCM | |
786 | gdbscm_value_call (SCM self, SCM args) | |
787 | { | |
788 | value_smob *v_smob | |
789 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
790 | struct value *function = v_smob->value; | |
791 | struct value *mark = value_mark (); | |
792 | struct type *ftype = NULL; | |
793 | long args_count; | |
794 | struct value **vargs = NULL; | |
795 | SCM result = SCM_BOOL_F; | |
796 | volatile struct gdb_exception except; | |
797 | ||
798 | TRY_CATCH (except, RETURN_MASK_ALL) | |
799 | { | |
800 | ftype = check_typedef (value_type (function)); | |
801 | } | |
802 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
803 | ||
804 | SCM_ASSERT_TYPE (TYPE_CODE (ftype) == TYPE_CODE_FUNC, self, | |
805 | SCM_ARG1, FUNC_NAME, | |
806 | _("function (value of TYPE_CODE_FUNC)")); | |
807 | ||
808 | SCM_ASSERT_TYPE (gdbscm_is_true (scm_list_p (args)), args, | |
809 | SCM_ARG2, FUNC_NAME, _("list")); | |
810 | ||
811 | args_count = scm_ilength (args); | |
812 | if (args_count > 0) | |
813 | { | |
814 | struct gdbarch *gdbarch = get_current_arch (); | |
815 | const struct language_defn *language = current_language; | |
816 | SCM except_scm; | |
817 | long i; | |
818 | ||
819 | vargs = alloca (sizeof (struct value *) * args_count); | |
820 | for (i = 0; i < args_count; i++) | |
821 | { | |
822 | SCM arg = scm_car (args); | |
823 | ||
824 | vargs[i] = vlscm_convert_value_from_scheme (FUNC_NAME, | |
825 | GDBSCM_ARG_NONE, arg, | |
826 | &except_scm, | |
827 | gdbarch, language); | |
828 | if (vargs[i] == NULL) | |
829 | gdbscm_throw (except_scm); | |
830 | ||
831 | args = scm_cdr (args); | |
832 | } | |
833 | gdb_assert (gdbscm_is_true (scm_null_p (args))); | |
834 | } | |
835 | ||
836 | TRY_CATCH (except, RETURN_MASK_ALL) | |
837 | { | |
838 | struct cleanup *cleanup = make_cleanup_value_free_to_mark (mark); | |
839 | struct value *return_value; | |
840 | ||
841 | return_value = call_function_by_hand (function, args_count, vargs); | |
842 | result = vlscm_scm_from_value (return_value); | |
843 | do_cleanups (cleanup); | |
844 | } | |
845 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
846 | ||
847 | if (gdbscm_is_exception (result)) | |
848 | gdbscm_throw (result); | |
849 | ||
850 | return result; | |
851 | } | |
852 | ||
853 | /* (value->bytevector <gdb:value>) -> bytevector */ | |
854 | ||
855 | static SCM | |
856 | gdbscm_value_to_bytevector (SCM self) | |
857 | { | |
858 | value_smob *v_smob | |
859 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
860 | struct value *value = v_smob->value; | |
861 | struct type *type; | |
862 | size_t length = 0; | |
863 | const gdb_byte *contents = NULL; | |
864 | SCM bv; | |
865 | volatile struct gdb_exception except; | |
866 | ||
867 | type = value_type (value); | |
868 | ||
869 | TRY_CATCH (except, RETURN_MASK_ALL) | |
870 | { | |
871 | CHECK_TYPEDEF (type); | |
872 | length = TYPE_LENGTH (type); | |
873 | contents = value_contents (value); | |
874 | } | |
875 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
876 | ||
877 | bv = scm_c_make_bytevector (length); | |
878 | memcpy (SCM_BYTEVECTOR_CONTENTS (bv), contents, length); | |
879 | ||
880 | return bv; | |
881 | } | |
882 | ||
883 | /* Helper function to determine if a type is "int-like". */ | |
884 | ||
885 | static int | |
886 | is_intlike (struct type *type, int ptr_ok) | |
887 | { | |
888 | return (TYPE_CODE (type) == TYPE_CODE_INT | |
889 | || TYPE_CODE (type) == TYPE_CODE_ENUM | |
890 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
891 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
892 | || (ptr_ok && TYPE_CODE (type) == TYPE_CODE_PTR)); | |
893 | } | |
894 | ||
895 | /* (value->bool <gdb:value>) -> boolean | |
896 | Throws an error if the value is not integer-like. */ | |
897 | ||
898 | static SCM | |
899 | gdbscm_value_to_bool (SCM self) | |
900 | { | |
901 | value_smob *v_smob | |
902 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
903 | struct value *value = v_smob->value; | |
904 | struct type *type; | |
905 | LONGEST l = 0; | |
906 | volatile struct gdb_exception except; | |
907 | ||
908 | type = value_type (value); | |
909 | ||
910 | TRY_CATCH (except, RETURN_MASK_ALL) | |
911 | { | |
912 | CHECK_TYPEDEF (type); | |
913 | } | |
914 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
915 | ||
916 | SCM_ASSERT_TYPE (is_intlike (type, 1), self, SCM_ARG1, FUNC_NAME, | |
917 | _("integer-like gdb value")); | |
918 | ||
919 | TRY_CATCH (except, RETURN_MASK_ALL) | |
920 | { | |
921 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
922 | l = value_as_address (value); | |
923 | else | |
924 | l = value_as_long (value); | |
925 | } | |
926 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
927 | ||
928 | return scm_from_bool (l != 0); | |
929 | } | |
930 | ||
931 | /* (value->integer <gdb:value>) -> integer | |
932 | Throws an error if the value is not integer-like. */ | |
933 | ||
934 | static SCM | |
935 | gdbscm_value_to_integer (SCM self) | |
936 | { | |
937 | value_smob *v_smob | |
938 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
939 | struct value *value = v_smob->value; | |
940 | struct type *type; | |
941 | LONGEST l = 0; | |
942 | volatile struct gdb_exception except; | |
943 | ||
944 | type = value_type (value); | |
945 | ||
946 | TRY_CATCH (except, RETURN_MASK_ALL) | |
947 | { | |
948 | CHECK_TYPEDEF (type); | |
949 | } | |
950 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
951 | ||
952 | SCM_ASSERT_TYPE (is_intlike (type, 1), self, SCM_ARG1, FUNC_NAME, | |
953 | _("integer-like gdb value")); | |
954 | ||
955 | TRY_CATCH (except, RETURN_MASK_ALL) | |
956 | { | |
957 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
958 | l = value_as_address (value); | |
959 | else | |
960 | l = value_as_long (value); | |
961 | } | |
962 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
963 | ||
964 | if (TYPE_UNSIGNED (type)) | |
965 | return gdbscm_scm_from_ulongest (l); | |
966 | else | |
967 | return gdbscm_scm_from_longest (l); | |
968 | } | |
969 | ||
970 | /* (value->real <gdb:value>) -> real | |
971 | Throws an error if the value is not a number. */ | |
972 | ||
973 | static SCM | |
974 | gdbscm_value_to_real (SCM self) | |
975 | { | |
976 | value_smob *v_smob | |
977 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
978 | struct value *value = v_smob->value; | |
979 | struct type *type; | |
980 | DOUBLEST d = 0; | |
981 | volatile struct gdb_exception except; | |
982 | ||
983 | type = value_type (value); | |
984 | ||
985 | TRY_CATCH (except, RETURN_MASK_ALL) | |
986 | { | |
987 | CHECK_TYPEDEF (type); | |
988 | } | |
989 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
990 | ||
991 | SCM_ASSERT_TYPE (is_intlike (type, 0) || TYPE_CODE (type) == TYPE_CODE_FLT, | |
992 | self, SCM_ARG1, FUNC_NAME, _("number")); | |
993 | ||
994 | TRY_CATCH (except, RETURN_MASK_ALL) | |
995 | { | |
996 | d = value_as_double (value); | |
997 | } | |
998 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
999 | ||
1000 | /* TODO: Is there a better way to check if the value fits? */ | |
1001 | if (d != (double) d) | |
1002 | gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG1, self, | |
1003 | _("number can't be converted to a double")); | |
1004 | ||
1005 | return scm_from_double (d); | |
1006 | } | |
1007 | ||
1008 | /* (value->string <gdb:value> | |
1009 | [#:encoding encoding] | |
1010 | [#:errors #f | 'error | 'substitute] | |
1011 | [#:length length]) | |
1012 | -> string | |
1013 | Return Unicode string with value's contents, which must be a string. | |
1014 | ||
1015 | If ENCODING is not given, the string is assumed to be encoded in | |
1016 | the target's charset. | |
1017 | ||
1018 | ERRORS is one of #f, 'error or 'substitute. | |
1019 | An error setting of #f means use the default, which is | |
1020 | Guile's %default-port-conversion-strategy. If the default is not one | |
1021 | of 'error or 'substitute, 'substitute is used. | |
1022 | An error setting of "error" causes an exception to be thrown if there's | |
1023 | a decoding error. An error setting of "substitute" causes invalid | |
1024 | characters to be replaced with "?". | |
1025 | ||
1026 | If LENGTH is provided, only fetch string to the length provided. | |
1027 | LENGTH must be a Scheme integer, it can't be a <gdb:value> integer. */ | |
1028 | ||
1029 | static SCM | |
1030 | gdbscm_value_to_string (SCM self, SCM rest) | |
1031 | { | |
1032 | value_smob *v_smob | |
1033 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
1034 | struct value *value = v_smob->value; | |
1035 | const SCM keywords[] = { | |
1036 | encoding_keyword, errors_keyword, length_keyword, SCM_BOOL_F | |
1037 | }; | |
1038 | int encoding_arg_pos = -1, errors_arg_pos = -1, length_arg_pos = -1; | |
1039 | char *encoding = NULL; | |
1040 | SCM errors = SCM_BOOL_F; | |
1041 | int length = -1; | |
1042 | gdb_byte *buffer = NULL; | |
1043 | const char *la_encoding = NULL; | |
1044 | struct type *char_type = NULL; | |
1045 | SCM result; | |
1046 | struct cleanup *cleanups; | |
1047 | volatile struct gdb_exception except; | |
1048 | ||
1049 | /* The sequencing here, as everywhere else, is important. | |
1050 | We can't have existing cleanups when a Scheme exception is thrown. */ | |
1051 | ||
1052 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, keywords, "#sOi", rest, | |
1053 | &encoding_arg_pos, &encoding, | |
1054 | &errors_arg_pos, &errors, | |
1055 | &length_arg_pos, &length); | |
1056 | ||
1057 | cleanups = make_cleanup (xfree, encoding); | |
1058 | ||
1059 | if (errors_arg_pos > 0 | |
1060 | && errors != SCM_BOOL_F | |
1061 | && !scm_is_eq (errors, error_symbol) | |
1062 | && !scm_is_eq (errors, substitute_symbol)) | |
1063 | { | |
1064 | SCM excp | |
1065 | = gdbscm_make_out_of_range_error (FUNC_NAME, errors_arg_pos, errors, | |
1066 | _("invalid error kind")); | |
1067 | ||
1068 | do_cleanups (cleanups); | |
1069 | gdbscm_throw (excp); | |
1070 | } | |
1071 | if (errors == SCM_BOOL_F) | |
1072 | errors = scm_port_conversion_strategy (SCM_BOOL_F); | |
1073 | /* We don't assume anything about the result of scm_port_conversion_strategy. | |
1074 | From this point on, if errors is not 'errors, use 'substitute. */ | |
1075 | ||
1076 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1077 | { | |
1078 | LA_GET_STRING (value, &buffer, &length, &char_type, &la_encoding); | |
1079 | } | |
1080 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
1081 | ||
1082 | /* If errors is "error" scm_from_stringn may throw a Scheme exception. | |
1083 | Make sure we don't leak. This is done via scm_dynwind_begin, et.al. */ | |
1084 | discard_cleanups (cleanups); | |
1085 | ||
1086 | scm_dynwind_begin (0); | |
1087 | ||
1088 | gdbscm_dynwind_xfree (encoding); | |
1089 | gdbscm_dynwind_xfree (buffer); | |
1090 | ||
1091 | result = scm_from_stringn ((const char *) buffer, | |
1092 | length * TYPE_LENGTH (char_type), | |
1093 | (encoding != NULL && *encoding != '\0' | |
1094 | ? encoding | |
1095 | : la_encoding), | |
1096 | scm_is_eq (errors, error_symbol) | |
1097 | ? SCM_FAILED_CONVERSION_ERROR | |
1098 | : SCM_FAILED_CONVERSION_QUESTION_MARK); | |
1099 | ||
1100 | scm_dynwind_end (); | |
1101 | ||
1102 | return result; | |
1103 | } | |
1104 | ||
1105 | /* (value->lazy-string <gdb:value> [#:encoding encoding] [#:length length]) | |
1106 | -> <gdb:lazy-string> | |
1107 | Return a Scheme object representing a lazy_string_object type. | |
1108 | A lazy string is a pointer to a string with an optional encoding and length. | |
1109 | If ENCODING is not given, the target's charset is used. | |
1110 | If LENGTH is provided then the length parameter is set to LENGTH, otherwise | |
1111 | length will be set to -1 (first null of appropriate with). | |
1112 | LENGTH must be a Scheme integer, it can't be a <gdb:value> integer. */ | |
1113 | ||
1114 | static SCM | |
1115 | gdbscm_value_to_lazy_string (SCM self, SCM rest) | |
1116 | { | |
1117 | value_smob *v_smob | |
1118 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
1119 | struct value *value = v_smob->value; | |
1120 | const SCM keywords[] = { encoding_keyword, length_keyword, SCM_BOOL_F }; | |
1121 | int encoding_arg_pos = -1, length_arg_pos = -1; | |
1122 | char *encoding = NULL; | |
1123 | int length = -1; | |
1124 | SCM result = SCM_BOOL_F; /* -Wall */ | |
1125 | struct cleanup *cleanups; | |
1126 | volatile struct gdb_exception except; | |
1127 | ||
1128 | /* The sequencing here, as everywhere else, is important. | |
1129 | We can't have existing cleanups when a Scheme exception is thrown. */ | |
1130 | ||
1131 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, keywords, "#si", rest, | |
1132 | &encoding_arg_pos, &encoding, | |
1133 | &length_arg_pos, &length); | |
1134 | ||
1135 | cleanups = make_cleanup (xfree, encoding); | |
1136 | ||
1137 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1138 | { | |
1139 | struct cleanup *inner_cleanup | |
1140 | = make_cleanup_value_free_to_mark (value_mark ()); | |
1141 | ||
1142 | if (TYPE_CODE (value_type (value)) == TYPE_CODE_PTR) | |
1143 | value = value_ind (value); | |
1144 | ||
1145 | result = lsscm_make_lazy_string (value_address (value), length, | |
1146 | encoding, value_type (value)); | |
1147 | ||
1148 | do_cleanups (inner_cleanup); | |
1149 | } | |
1150 | do_cleanups (cleanups); | |
1151 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
1152 | ||
1153 | if (gdbscm_is_exception (result)) | |
1154 | gdbscm_throw (result); | |
1155 | ||
1156 | return result; | |
1157 | } | |
1158 | ||
1159 | /* (value-lazy? <gdb:value>) -> boolean */ | |
1160 | ||
1161 | static SCM | |
1162 | gdbscm_value_lazy_p (SCM self) | |
1163 | { | |
1164 | value_smob *v_smob | |
1165 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
1166 | struct value *value = v_smob->value; | |
1167 | ||
1168 | return scm_from_bool (value_lazy (value)); | |
1169 | } | |
1170 | ||
1171 | /* (value-fetch-lazy! <gdb:value>) -> unspecified */ | |
1172 | ||
1173 | static SCM | |
1174 | gdbscm_value_fetch_lazy_x (SCM self) | |
1175 | { | |
1176 | value_smob *v_smob | |
1177 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
1178 | struct value *value = v_smob->value; | |
1179 | volatile struct gdb_exception except; | |
1180 | ||
1181 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1182 | { | |
1183 | if (value_lazy (value)) | |
1184 | value_fetch_lazy (value); | |
1185 | } | |
1186 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
1187 | ||
1188 | return SCM_UNSPECIFIED; | |
1189 | } | |
1190 | ||
1191 | /* (value-print <gdb:value>) -> string */ | |
1192 | ||
1193 | static SCM | |
1194 | gdbscm_value_print (SCM self) | |
1195 | { | |
1196 | value_smob *v_smob | |
1197 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
1198 | struct value *value = v_smob->value; | |
1199 | struct value_print_options opts; | |
1200 | char *s = NULL; | |
1201 | SCM result; | |
1202 | volatile struct gdb_exception except; | |
1203 | ||
1204 | get_user_print_options (&opts); | |
1205 | opts.deref_ref = 0; | |
1206 | ||
1207 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1208 | { | |
1209 | struct ui_file *stb = mem_fileopen (); | |
1210 | struct cleanup *old_chain = make_cleanup_ui_file_delete (stb); | |
1211 | ||
1212 | common_val_print (value, stb, 0, &opts, current_language); | |
1213 | s = ui_file_xstrdup (stb, NULL); | |
1214 | ||
1215 | do_cleanups (old_chain); | |
1216 | } | |
1217 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
1218 | ||
1219 | /* Use SCM_FAILED_CONVERSION_QUESTION_MARK to ensure this doesn't | |
1220 | throw an error if the encoding fails. | |
1221 | IWBN to use scm_take_locale_string here, but we'd have to temporarily | |
1222 | override the default port conversion handler because contrary to | |
1223 | documentation it doesn't necessarily free the input string. */ | |
1224 | result = scm_from_stringn (s, strlen (s), host_charset (), | |
1225 | SCM_FAILED_CONVERSION_QUESTION_MARK); | |
1226 | xfree (s); | |
1227 | ||
1228 | return result; | |
1229 | } | |
1230 | \f | |
1231 | /* (parse-and-eval string) -> <gdb:value> | |
1232 | Parse a string and evaluate the string as an expression. */ | |
1233 | ||
1234 | static SCM | |
1235 | gdbscm_parse_and_eval (SCM expr_scm) | |
1236 | { | |
1237 | char *expr_str; | |
1238 | struct value *res_val = NULL; | |
1239 | SCM result; | |
1240 | struct cleanup *cleanups; | |
1241 | volatile struct gdb_exception except; | |
1242 | ||
1243 | /* The sequencing here, as everywhere else, is important. | |
1244 | We can't have existing cleanups when a Scheme exception is thrown. */ | |
1245 | ||
1246 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, NULL, "s", | |
1247 | expr_scm, &expr_str); | |
1248 | ||
1249 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
1250 | make_cleanup (xfree, expr_str); | |
1251 | ||
1252 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1253 | { | |
1254 | res_val = parse_and_eval (expr_str); | |
1255 | } | |
1256 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
1257 | ||
1258 | gdb_assert (res_val != NULL); | |
1259 | result = vlscm_scm_from_value (res_val); | |
1260 | ||
1261 | do_cleanups (cleanups); | |
1262 | ||
1263 | if (gdbscm_is_exception (result)) | |
1264 | gdbscm_throw (result); | |
1265 | ||
1266 | return result; | |
1267 | } | |
1268 | ||
1269 | /* (history-ref integer) -> <gdb:value> | |
1270 | Return the specified value from GDB's value history. */ | |
1271 | ||
1272 | static SCM | |
1273 | gdbscm_history_ref (SCM index) | |
1274 | { | |
1275 | int i; | |
1276 | struct value *res_val = NULL; /* Initialize to appease gcc warning. */ | |
1277 | volatile struct gdb_exception except; | |
1278 | ||
1279 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, NULL, "i", index, &i); | |
1280 | ||
1281 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1282 | { | |
1283 | res_val = access_value_history (i); | |
1284 | } | |
1285 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
1286 | ||
1287 | return vlscm_scm_from_value (res_val); | |
1288 | } | |
7a5a839f LC |
1289 | |
1290 | /* (history-append! <gdb:value>) -> index | |
1291 | Append VALUE to GDB's value history. Return its index in the history. */ | |
1292 | ||
1293 | static SCM | |
1294 | gdbscm_history_append_x (SCM value) | |
1295 | { | |
1296 | int res_index = -1; | |
1297 | struct value *v; | |
fb934770 | 1298 | value_smob *v_smob; |
7a5a839f LC |
1299 | volatile struct gdb_exception except; |
1300 | ||
fb934770 LC |
1301 | v_smob = vlscm_get_value_smob_arg_unsafe (value, SCM_ARG1, FUNC_NAME); |
1302 | v = v_smob->value; | |
7a5a839f LC |
1303 | |
1304 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1305 | { | |
1306 | res_index = record_latest_value (v); | |
1307 | } | |
1308 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
1309 | ||
1310 | return scm_from_int (res_index); | |
1311 | } | |
ed3ef339 DE |
1312 | \f |
1313 | /* Initialize the Scheme value code. */ | |
1314 | ||
1315 | static const scheme_function value_functions[] = | |
1316 | { | |
1317 | { "value?", 1, 0, 0, gdbscm_value_p, | |
1318 | "\ | |
1319 | Return #t if the object is a <gdb:value> object." }, | |
1320 | ||
1321 | { "make-value", 1, 0, 1, gdbscm_make_value, | |
1322 | "\ | |
1323 | Create a <gdb:value> representing object.\n\ | |
1324 | Typically this is used to convert numbers and strings to\n\ | |
1325 | <gdb:value> objects.\n\ | |
1326 | \n\ | |
1327 | Arguments: object [#:type <gdb:type>]" }, | |
1328 | ||
1329 | { "value-optimized-out?", 1, 0, 0, gdbscm_value_optimized_out_p, | |
1330 | "\ | |
1331 | Return #t if the value has been optimizd out." }, | |
1332 | ||
1333 | { "value-address", 1, 0, 0, gdbscm_value_address, | |
1334 | "\ | |
1335 | Return the address of the value." }, | |
1336 | ||
1337 | { "value-type", 1, 0, 0, gdbscm_value_type, | |
1338 | "\ | |
1339 | Return the type of the value." }, | |
1340 | ||
1341 | { "value-dynamic-type", 1, 0, 0, gdbscm_value_dynamic_type, | |
1342 | "\ | |
1343 | Return the dynamic type of the value." }, | |
1344 | ||
1345 | { "value-cast", 2, 0, 0, gdbscm_value_cast, | |
1346 | "\ | |
1347 | Cast the value to the supplied type.\n\ | |
1348 | \n\ | |
1349 | Arguments: <gdb:value> <gdb:type>" }, | |
1350 | ||
1351 | { "value-dynamic-cast", 2, 0, 0, gdbscm_value_dynamic_cast, | |
1352 | "\ | |
1353 | Cast the value to the supplied type, as if by the C++\n\ | |
1354 | dynamic_cast operator.\n\ | |
1355 | \n\ | |
1356 | Arguments: <gdb:value> <gdb:type>" }, | |
1357 | ||
1358 | { "value-reinterpret-cast", 2, 0, 0, gdbscm_value_reinterpret_cast, | |
1359 | "\ | |
1360 | Cast the value to the supplied type, as if by the C++\n\ | |
1361 | reinterpret_cast operator.\n\ | |
1362 | \n\ | |
1363 | Arguments: <gdb:value> <gdb:type>" }, | |
1364 | ||
1365 | { "value-dereference", 1, 0, 0, gdbscm_value_dereference, | |
1366 | "\ | |
1367 | Return the result of applying the C unary * operator to the value." }, | |
1368 | ||
1369 | { "value-referenced-value", 1, 0, 0, gdbscm_value_referenced_value, | |
1370 | "\ | |
1371 | Given a value of a reference type, return the value referenced.\n\ | |
1372 | The difference between this function and value-dereference is that\n\ | |
1373 | the latter applies * unary operator to a value, which need not always\n\ | |
1374 | result in the value referenced.\n\ | |
1375 | For example, for a value which is a reference to an 'int' pointer ('int *'),\n\ | |
1376 | value-dereference will result in a value of type 'int' while\n\ | |
1377 | value-referenced-value will result in a value of type 'int *'." }, | |
1378 | ||
1379 | { "value-field", 2, 0, 0, gdbscm_value_field, | |
1380 | "\ | |
1381 | Return the specified field of the value.\n\ | |
1382 | \n\ | |
1383 | Arguments: <gdb:value> string" }, | |
1384 | ||
1385 | { "value-subscript", 2, 0, 0, gdbscm_value_subscript, | |
1386 | "\ | |
1387 | Return the value of the array at the specified index.\n\ | |
1388 | \n\ | |
1389 | Arguments: <gdb:value> integer" }, | |
1390 | ||
1391 | { "value-call", 2, 0, 0, gdbscm_value_call, | |
1392 | "\ | |
1393 | Perform an inferior function call taking the value as a pointer to the\n\ | |
1394 | function to call.\n\ | |
1395 | Each element of the argument list must be a <gdb:value> object or an object\n\ | |
1396 | that can be converted to one.\n\ | |
1397 | The result is the value returned by the function.\n\ | |
1398 | \n\ | |
1399 | Arguments: <gdb:value> arg-list" }, | |
1400 | ||
1401 | { "value->bool", 1, 0, 0, gdbscm_value_to_bool, | |
1402 | "\ | |
1403 | Return the Scheme boolean representing the GDB value.\n\ | |
1404 | The value must be \"integer like\". Pointers are ok." }, | |
1405 | ||
1406 | { "value->integer", 1, 0, 0, gdbscm_value_to_integer, | |
1407 | "\ | |
1408 | Return the Scheme integer representing the GDB value.\n\ | |
1409 | The value must be \"integer like\". Pointers are ok." }, | |
1410 | ||
1411 | { "value->real", 1, 0, 0, gdbscm_value_to_real, | |
1412 | "\ | |
1413 | Return the Scheme real number representing the GDB value.\n\ | |
1414 | The value must be a number." }, | |
1415 | ||
1416 | { "value->bytevector", 1, 0, 0, gdbscm_value_to_bytevector, | |
1417 | "\ | |
1418 | Return a Scheme bytevector with the raw contents of the GDB value.\n\ | |
1419 | No transformation, endian or otherwise, is performed." }, | |
1420 | ||
1421 | { "value->string", 1, 0, 1, gdbscm_value_to_string, | |
1422 | "\ | |
1423 | Return the Unicode string of the value's contents.\n\ | |
1424 | If ENCODING is not given, the string is assumed to be encoded in\n\ | |
1425 | the target's charset.\n\ | |
1426 | An error setting \"error\" causes an exception to be thrown if there's\n\ | |
1427 | a decoding error. An error setting of \"substitute\" causes invalid\n\ | |
1428 | characters to be replaced with \"?\". The default is \"error\".\n\ | |
1429 | If LENGTH is provided, only fetch string to the length provided.\n\ | |
1430 | \n\ | |
1431 | Arguments: <gdb:value>\n\ | |
1432 | [#:encoding encoding] [#:errors \"error\"|\"substitute\"]\n\ | |
1433 | [#:length length]" }, | |
1434 | ||
1435 | { "value->lazy-string", 1, 0, 1, gdbscm_value_to_lazy_string, | |
1436 | "\ | |
1437 | Return a Scheme object representing a lazily fetched Unicode string\n\ | |
1438 | of the value's contents.\n\ | |
1439 | If ENCODING is not given, the string is assumed to be encoded in\n\ | |
1440 | the target's charset.\n\ | |
1441 | If LENGTH is provided, only fetch string to the length provided.\n\ | |
1442 | \n\ | |
1443 | Arguments: <gdb:value> [#:encoding encoding] [#:length length]" }, | |
1444 | ||
1445 | { "value-lazy?", 1, 0, 0, gdbscm_value_lazy_p, | |
1446 | "\ | |
1447 | Return #t if the value is lazy (not fetched yet from the inferior).\n\ | |
1448 | A lazy value is fetched when needed, or when the value-fetch-lazy! function\n\ | |
1449 | is called." }, | |
1450 | ||
1451 | { "make-lazy-value", 2, 0, 0, gdbscm_make_lazy_value, | |
1452 | "\ | |
1453 | Create a <gdb:value> that will be lazily fetched from the target.\n\ | |
1454 | \n\ | |
1455 | Arguments: <gdb:type> address" }, | |
1456 | ||
1457 | { "value-fetch-lazy!", 1, 0, 0, gdbscm_value_fetch_lazy_x, | |
1458 | "\ | |
1459 | Fetch the value from the inferior, if it was lazy.\n\ | |
1460 | The result is \"unspecified\"." }, | |
1461 | ||
1462 | { "value-print", 1, 0, 0, gdbscm_value_print, | |
1463 | "\ | |
1464 | Return the string representation (print form) of the value." }, | |
1465 | ||
1466 | { "parse-and-eval", 1, 0, 0, gdbscm_parse_and_eval, | |
1467 | "\ | |
1468 | Evaluates string in gdb and returns the result as a <gdb:value> object." }, | |
1469 | ||
1470 | { "history-ref", 1, 0, 0, gdbscm_history_ref, | |
1471 | "\ | |
1472 | Return the specified value from GDB's value history." }, | |
1473 | ||
7a5a839f LC |
1474 | { "history-append!", 1, 0, 0, gdbscm_history_append_x, |
1475 | "\ | |
1476 | Append the specified value onto GDB's value history." }, | |
1477 | ||
ed3ef339 DE |
1478 | END_FUNCTIONS |
1479 | }; | |
1480 | ||
1481 | void | |
1482 | gdbscm_initialize_values (void) | |
1483 | { | |
1484 | value_smob_tag = gdbscm_make_smob_type (value_smob_name, | |
1485 | sizeof (value_smob)); | |
ed3ef339 DE |
1486 | scm_set_smob_free (value_smob_tag, vlscm_free_value_smob); |
1487 | scm_set_smob_print (value_smob_tag, vlscm_print_value_smob); | |
1488 | scm_set_smob_equalp (value_smob_tag, vlscm_equal_p_value_smob); | |
1489 | ||
1490 | gdbscm_define_functions (value_functions, 1); | |
1491 | ||
1492 | type_keyword = scm_from_latin1_keyword ("type"); | |
1493 | encoding_keyword = scm_from_latin1_keyword ("encoding"); | |
1494 | errors_keyword = scm_from_latin1_keyword ("errors"); | |
1495 | length_keyword = scm_from_latin1_keyword ("length"); | |
1496 | ||
1497 | error_symbol = scm_from_latin1_symbol ("error"); | |
1498 | escape_symbol = scm_from_latin1_symbol ("escape"); | |
1499 | substitute_symbol = scm_from_latin1_symbol ("substitute"); | |
1500 | } |