Commit | Line | Data |
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ed3ef339 DE |
1 | /* Scheme interface to values. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2008-2020 Free Software Foundation, Inc. |
ed3ef339 DE |
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" | |
14ad9311 | 27 | #include "target-float.h" |
ed3ef339 DE |
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); | |
22bc8444 | 134 | value_decref (v_smob->value); |
ed3ef339 DE |
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); | |
ed3ef339 | 145 | struct value_print_options opts; |
ed3ef339 DE |
146 | |
147 | if (pstate->writingp) | |
148 | gdbscm_printf (port, "#<%s ", value_smob_name); | |
149 | ||
150 | get_user_print_options (&opts); | |
151 | opts.deref_ref = 0; | |
152 | ||
153 | /* pstate->writingp = zero if invoked by display/~A, and nonzero if | |
154 | invoked by write/~S. What to do here may need to evolve. | |
155 | IWBN if we could pass an argument to format that would we could use | |
156 | instead of writingp. */ | |
157 | opts.raw = !!pstate->writingp; | |
158 | ||
680d7fd5 | 159 | gdbscm_gdb_exception exc {}; |
a70b8144 | 160 | try |
ed3ef339 | 161 | { |
d7e74731 | 162 | string_file stb; |
ed3ef339 | 163 | |
d7e74731 PA |
164 | common_val_print (v_smob->value, &stb, 0, &opts, current_language); |
165 | scm_puts (stb.c_str (), port); | |
ed3ef339 | 166 | } |
230d2906 | 167 | catch (const gdb_exception &except) |
492d29ea | 168 | { |
680d7fd5 | 169 | exc = unpack (except); |
492d29ea | 170 | } |
ed3ef339 | 171 | |
680d7fd5 | 172 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
173 | if (pstate->writingp) |
174 | scm_puts (">", port); | |
175 | ||
176 | scm_remember_upto_here_1 (self); | |
177 | ||
178 | /* Non-zero means success. */ | |
179 | return 1; | |
180 | } | |
181 | ||
182 | /* The smob "equalp" function for <gdb:value>. */ | |
183 | ||
184 | static SCM | |
185 | vlscm_equal_p_value_smob (SCM v1, SCM v2) | |
186 | { | |
187 | const value_smob *v1_smob = (value_smob *) SCM_SMOB_DATA (v1); | |
188 | const value_smob *v2_smob = (value_smob *) SCM_SMOB_DATA (v2); | |
189 | int result = 0; | |
ed3ef339 | 190 | |
680d7fd5 | 191 | gdbscm_gdb_exception exc {}; |
a70b8144 | 192 | try |
ed3ef339 DE |
193 | { |
194 | result = value_equal (v1_smob->value, v2_smob->value); | |
195 | } | |
230d2906 | 196 | catch (const gdb_exception &except) |
492d29ea | 197 | { |
680d7fd5 | 198 | exc = unpack (except); |
492d29ea | 199 | } |
ed3ef339 | 200 | |
680d7fd5 | 201 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
202 | return scm_from_bool (result); |
203 | } | |
204 | ||
205 | /* Low level routine to create a <gdb:value> object. */ | |
206 | ||
207 | static SCM | |
208 | vlscm_make_value_smob (void) | |
209 | { | |
210 | value_smob *v_smob = (value_smob *) | |
211 | scm_gc_malloc (sizeof (value_smob), value_smob_name); | |
212 | SCM v_scm; | |
213 | ||
214 | /* These must be filled in by the caller. */ | |
215 | v_smob->value = NULL; | |
216 | v_smob->prev = NULL; | |
217 | v_smob->next = NULL; | |
218 | ||
219 | /* These are lazily computed. */ | |
220 | v_smob->address = SCM_UNDEFINED; | |
221 | v_smob->type = SCM_UNDEFINED; | |
222 | v_smob->dynamic_type = SCM_UNDEFINED; | |
223 | ||
224 | v_scm = scm_new_smob (value_smob_tag, (scm_t_bits) v_smob); | |
225 | gdbscm_init_gsmob (&v_smob->base); | |
226 | ||
227 | return v_scm; | |
228 | } | |
229 | ||
230 | /* Return non-zero if SCM is a <gdb:value> object. */ | |
231 | ||
232 | int | |
233 | vlscm_is_value (SCM scm) | |
234 | { | |
235 | return SCM_SMOB_PREDICATE (value_smob_tag, scm); | |
236 | } | |
237 | ||
238 | /* (value? object) -> boolean */ | |
239 | ||
240 | static SCM | |
241 | gdbscm_value_p (SCM scm) | |
242 | { | |
243 | return scm_from_bool (vlscm_is_value (scm)); | |
244 | } | |
245 | ||
246 | /* Create a new <gdb:value> object that encapsulates VALUE. | |
247 | The value is released from the all_values chain so its lifetime is not | |
248 | bound to the execution of a command. */ | |
249 | ||
250 | SCM | |
251 | vlscm_scm_from_value (struct value *value) | |
252 | { | |
253 | /* N.B. It's important to not cause any side-effects until we know the | |
254 | conversion worked. */ | |
255 | SCM v_scm = vlscm_make_value_smob (); | |
256 | value_smob *v_smob = (value_smob *) SCM_SMOB_DATA (v_scm); | |
257 | ||
22bc8444 | 258 | v_smob->value = release_value (value).release (); |
ed3ef339 DE |
259 | vlscm_remember_scheme_value (v_smob); |
260 | ||
261 | return v_scm; | |
262 | } | |
263 | ||
264 | /* Returns the <gdb:value> object in SELF. | |
265 | Throws an exception if SELF is not a <gdb:value> object. */ | |
266 | ||
267 | static SCM | |
268 | vlscm_get_value_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
269 | { | |
270 | SCM_ASSERT_TYPE (vlscm_is_value (self), self, arg_pos, func_name, | |
271 | value_smob_name); | |
272 | ||
273 | return self; | |
274 | } | |
275 | ||
276 | /* Returns a pointer to the value smob of SELF. | |
277 | Throws an exception if SELF is not a <gdb:value> object. */ | |
278 | ||
279 | static value_smob * | |
280 | vlscm_get_value_smob_arg_unsafe (SCM self, int arg_pos, const char *func_name) | |
281 | { | |
282 | SCM v_scm = vlscm_get_value_arg_unsafe (self, arg_pos, func_name); | |
283 | value_smob *v_smob = (value_smob *) SCM_SMOB_DATA (v_scm); | |
284 | ||
285 | return v_smob; | |
286 | } | |
287 | ||
288 | /* Return the value field of V_SCM, an object of type <gdb:value>. | |
289 | This exists so that we don't have to export the struct's contents. */ | |
290 | ||
291 | struct value * | |
292 | vlscm_scm_to_value (SCM v_scm) | |
293 | { | |
294 | value_smob *v_smob; | |
295 | ||
296 | gdb_assert (vlscm_is_value (v_scm)); | |
297 | v_smob = (value_smob *) SCM_SMOB_DATA (v_scm); | |
298 | return v_smob->value; | |
299 | } | |
300 | \f | |
301 | /* Value methods. */ | |
302 | ||
303 | /* (make-value x [#:type type]) -> <gdb:value> */ | |
304 | ||
305 | static SCM | |
306 | gdbscm_make_value (SCM x, SCM rest) | |
307 | { | |
ed3ef339 | 308 | const SCM keywords[] = { type_keyword, SCM_BOOL_F }; |
557e56be | 309 | |
ed3ef339 DE |
310 | int type_arg_pos = -1; |
311 | SCM type_scm = SCM_UNDEFINED; | |
ed3ef339 DE |
312 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, keywords, "#O", rest, |
313 | &type_arg_pos, &type_scm); | |
314 | ||
557e56be | 315 | struct type *type = NULL; |
ed3ef339 DE |
316 | if (type_arg_pos > 0) |
317 | { | |
557e56be PA |
318 | type_smob *t_smob = tyscm_get_type_smob_arg_unsafe (type_scm, |
319 | type_arg_pos, | |
320 | FUNC_NAME); | |
ed3ef339 DE |
321 | type = tyscm_type_smob_type (t_smob); |
322 | } | |
323 | ||
557e56be PA |
324 | return gdbscm_wrap ([=] |
325 | { | |
326 | scoped_value_mark free_values; | |
ed3ef339 | 327 | |
557e56be PA |
328 | SCM except_scm; |
329 | struct value *value | |
330 | = vlscm_convert_typed_value_from_scheme (FUNC_NAME, SCM_ARG1, x, | |
ed3ef339 DE |
331 | type_arg_pos, type_scm, type, |
332 | &except_scm, | |
557e56be PA |
333 | get_current_arch (), |
334 | current_language); | |
335 | if (value == NULL) | |
336 | return except_scm; | |
ed3ef339 | 337 | |
557e56be PA |
338 | return vlscm_scm_from_value (value); |
339 | }); | |
ed3ef339 DE |
340 | } |
341 | ||
342 | /* (make-lazy-value <gdb:type> address) -> <gdb:value> */ | |
343 | ||
344 | static SCM | |
345 | gdbscm_make_lazy_value (SCM type_scm, SCM address_scm) | |
346 | { | |
557e56be PA |
347 | type_smob *t_smob = tyscm_get_type_smob_arg_unsafe (type_scm, |
348 | SCM_ARG1, FUNC_NAME); | |
349 | struct type *type = tyscm_type_smob_type (t_smob); | |
ed3ef339 | 350 | |
557e56be | 351 | ULONGEST address; |
ed3ef339 DE |
352 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, NULL, "U", |
353 | address_scm, &address); | |
354 | ||
557e56be | 355 | return gdbscm_wrap ([=] |
492d29ea | 356 | { |
557e56be | 357 | scoped_value_mark free_values; |
ed3ef339 | 358 | |
557e56be PA |
359 | struct value *value = value_from_contents_and_address (type, NULL, |
360 | address); | |
361 | return vlscm_scm_from_value (value); | |
362 | }); | |
ed3ef339 DE |
363 | } |
364 | ||
365 | /* (value-optimized-out? <gdb:value>) -> boolean */ | |
366 | ||
367 | static SCM | |
368 | gdbscm_value_optimized_out_p (SCM self) | |
369 | { | |
370 | value_smob *v_smob | |
371 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
ed3ef339 | 372 | |
557e56be | 373 | return gdbscm_wrap ([=] |
492d29ea | 374 | { |
557e56be PA |
375 | return scm_from_bool (value_optimized_out (v_smob->value)); |
376 | }); | |
ed3ef339 DE |
377 | } |
378 | ||
379 | /* (value-address <gdb:value>) -> integer | |
380 | Returns #f if the value doesn't have one. */ | |
381 | ||
382 | static SCM | |
383 | gdbscm_value_address (SCM self) | |
384 | { | |
385 | value_smob *v_smob | |
386 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
387 | struct value *value = v_smob->value; | |
388 | ||
557e56be | 389 | return gdbscm_wrap ([=] |
ed3ef339 | 390 | { |
557e56be | 391 | if (SCM_UNBNDP (v_smob->address)) |
ed3ef339 | 392 | { |
557e56be | 393 | scoped_value_mark free_values; |
492d29ea | 394 | |
557e56be | 395 | SCM address = SCM_BOOL_F; |
ed3ef339 | 396 | |
a70b8144 | 397 | try |
557e56be PA |
398 | { |
399 | address = vlscm_scm_from_value (value_addr (value)); | |
400 | } | |
230d2906 | 401 | catch (const gdb_exception &except) |
557e56be PA |
402 | { |
403 | } | |
ed3ef339 | 404 | |
557e56be PA |
405 | if (gdbscm_is_exception (address)) |
406 | return address; | |
407 | ||
408 | v_smob->address = address; | |
409 | } | |
ed3ef339 | 410 | |
557e56be PA |
411 | return v_smob->address; |
412 | }); | |
ed3ef339 DE |
413 | } |
414 | ||
415 | /* (value-dereference <gdb:value>) -> <gdb:value> | |
416 | Given a value of a pointer type, apply the C unary * operator to it. */ | |
417 | ||
418 | static SCM | |
419 | gdbscm_value_dereference (SCM self) | |
420 | { | |
421 | value_smob *v_smob | |
422 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
ed3ef339 | 423 | |
557e56be | 424 | return gdbscm_wrap ([=] |
ed3ef339 | 425 | { |
557e56be | 426 | scoped_value_mark free_values; |
ed3ef339 | 427 | |
557e56be PA |
428 | struct value *res_val = value_ind (v_smob->value); |
429 | return vlscm_scm_from_value (res_val); | |
430 | }); | |
ed3ef339 DE |
431 | } |
432 | ||
433 | /* (value-referenced-value <gdb:value>) -> <gdb:value> | |
434 | Given a value of a reference type, return the value referenced. | |
435 | The difference between this function and gdbscm_value_dereference is that | |
436 | the latter applies * unary operator to a value, which need not always | |
437 | result in the value referenced. | |
438 | For example, for a value which is a reference to an 'int' pointer ('int *'), | |
439 | gdbscm_value_dereference will result in a value of type 'int' while | |
440 | gdbscm_value_referenced_value will result in a value of type 'int *'. */ | |
441 | ||
442 | static SCM | |
443 | gdbscm_value_referenced_value (SCM self) | |
444 | { | |
445 | value_smob *v_smob | |
446 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
447 | struct value *value = v_smob->value; | |
ed3ef339 | 448 | |
557e56be | 449 | return gdbscm_wrap ([=] |
ed3ef339 | 450 | { |
557e56be PA |
451 | scoped_value_mark free_values; |
452 | ||
453 | struct value *res_val; | |
454 | ||
ed3ef339 DE |
455 | switch (TYPE_CODE (check_typedef (value_type (value)))) |
456 | { | |
457 | case TYPE_CODE_PTR: | |
458 | res_val = value_ind (value); | |
459 | break; | |
460 | case TYPE_CODE_REF: | |
461 | res_val = coerce_ref (value); | |
462 | break; | |
463 | default: | |
464 | error (_("Trying to get the referenced value from a value which is" | |
465 | " neither a pointer nor a reference")); | |
466 | } | |
ed3ef339 | 467 | |
557e56be PA |
468 | return vlscm_scm_from_value (res_val); |
469 | }); | |
ed3ef339 DE |
470 | } |
471 | ||
472 | /* (value-type <gdb:value>) -> <gdb:type> */ | |
473 | ||
474 | static SCM | |
475 | gdbscm_value_type (SCM self) | |
476 | { | |
477 | value_smob *v_smob | |
478 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
479 | struct value *value = v_smob->value; | |
480 | ||
481 | if (SCM_UNBNDP (v_smob->type)) | |
482 | v_smob->type = tyscm_scm_from_type (value_type (value)); | |
483 | ||
484 | return v_smob->type; | |
485 | } | |
486 | ||
487 | /* (value-dynamic-type <gdb:value>) -> <gdb:type> */ | |
488 | ||
489 | static SCM | |
490 | gdbscm_value_dynamic_type (SCM self) | |
491 | { | |
492 | value_smob *v_smob | |
493 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
494 | struct value *value = v_smob->value; | |
495 | struct type *type = NULL; | |
ed3ef339 | 496 | |
1390d0ef | 497 | if (! SCM_UNBNDP (v_smob->dynamic_type)) |
ed3ef339 DE |
498 | return v_smob->dynamic_type; |
499 | ||
680d7fd5 | 500 | gdbscm_gdb_exception exc {}; |
a70b8144 | 501 | try |
ed3ef339 | 502 | { |
557e56be | 503 | scoped_value_mark free_values; |
ed3ef339 DE |
504 | |
505 | type = value_type (value); | |
f168693b | 506 | type = check_typedef (type); |
ed3ef339 DE |
507 | |
508 | if (((TYPE_CODE (type) == TYPE_CODE_PTR) | |
509 | || (TYPE_CODE (type) == TYPE_CODE_REF)) | |
4753d33b | 510 | && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT)) |
ed3ef339 DE |
511 | { |
512 | struct value *target; | |
513 | int was_pointer = TYPE_CODE (type) == TYPE_CODE_PTR; | |
514 | ||
0be03e84 DE |
515 | if (was_pointer) |
516 | target = value_ind (value); | |
517 | else | |
518 | target = coerce_ref (value); | |
ed3ef339 DE |
519 | type = value_rtti_type (target, NULL, NULL, NULL); |
520 | ||
521 | if (type) | |
522 | { | |
523 | if (was_pointer) | |
524 | type = lookup_pointer_type (type); | |
525 | else | |
3b224330 | 526 | type = lookup_lvalue_reference_type (type); |
ed3ef339 DE |
527 | } |
528 | } | |
4753d33b | 529 | else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) |
ed3ef339 DE |
530 | type = value_rtti_type (value, NULL, NULL, NULL); |
531 | else | |
532 | { | |
533 | /* Re-use object's static type. */ | |
534 | type = NULL; | |
535 | } | |
ed3ef339 | 536 | } |
230d2906 | 537 | catch (const gdb_exception &except) |
492d29ea | 538 | { |
680d7fd5 | 539 | exc = unpack (except); |
492d29ea | 540 | } |
ed3ef339 | 541 | |
680d7fd5 | 542 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
543 | if (type == NULL) |
544 | v_smob->dynamic_type = gdbscm_value_type (self); | |
545 | else | |
546 | v_smob->dynamic_type = tyscm_scm_from_type (type); | |
547 | ||
548 | return v_smob->dynamic_type; | |
549 | } | |
550 | ||
551 | /* A helper function that implements the various cast operators. */ | |
552 | ||
553 | static SCM | |
554 | vlscm_do_cast (SCM self, SCM type_scm, enum exp_opcode op, | |
555 | const char *func_name) | |
556 | { | |
557 | value_smob *v_smob | |
558 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
559 | struct value *value = v_smob->value; | |
560 | type_smob *t_smob | |
561 | = tyscm_get_type_smob_arg_unsafe (type_scm, SCM_ARG2, FUNC_NAME); | |
562 | struct type *type = tyscm_type_smob_type (t_smob); | |
ed3ef339 | 563 | |
557e56be | 564 | return gdbscm_wrap ([=] |
ed3ef339 | 565 | { |
557e56be PA |
566 | scoped_value_mark free_values; |
567 | ||
568 | struct value *res_val; | |
ed3ef339 DE |
569 | if (op == UNOP_DYNAMIC_CAST) |
570 | res_val = value_dynamic_cast (type, value); | |
571 | else if (op == UNOP_REINTERPRET_CAST) | |
572 | res_val = value_reinterpret_cast (type, value); | |
573 | else | |
574 | { | |
575 | gdb_assert (op == UNOP_CAST); | |
576 | res_val = value_cast (type, value); | |
577 | } | |
ed3ef339 | 578 | |
557e56be PA |
579 | return vlscm_scm_from_value (res_val); |
580 | }); | |
ed3ef339 DE |
581 | } |
582 | ||
583 | /* (value-cast <gdb:value> <gdb:type>) -> <gdb:value> */ | |
584 | ||
585 | static SCM | |
586 | gdbscm_value_cast (SCM self, SCM new_type) | |
587 | { | |
588 | return vlscm_do_cast (self, new_type, UNOP_CAST, FUNC_NAME); | |
589 | } | |
590 | ||
591 | /* (value-dynamic-cast <gdb:value> <gdb:type>) -> <gdb:value> */ | |
592 | ||
593 | static SCM | |
594 | gdbscm_value_dynamic_cast (SCM self, SCM new_type) | |
595 | { | |
596 | return vlscm_do_cast (self, new_type, UNOP_DYNAMIC_CAST, FUNC_NAME); | |
597 | } | |
598 | ||
599 | /* (value-reinterpret-cast <gdb:value> <gdb:type>) -> <gdb:value> */ | |
600 | ||
601 | static SCM | |
602 | gdbscm_value_reinterpret_cast (SCM self, SCM new_type) | |
603 | { | |
604 | return vlscm_do_cast (self, new_type, UNOP_REINTERPRET_CAST, FUNC_NAME); | |
605 | } | |
606 | ||
607 | /* (value-field <gdb:value> string) -> <gdb:value> | |
608 | Given string name of an element inside structure, return its <gdb:value> | |
609 | object. */ | |
610 | ||
611 | static SCM | |
612 | gdbscm_value_field (SCM self, SCM field_scm) | |
613 | { | |
614 | value_smob *v_smob | |
615 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
ed3ef339 DE |
616 | |
617 | SCM_ASSERT_TYPE (scm_is_string (field_scm), field_scm, SCM_ARG2, FUNC_NAME, | |
618 | _("string")); | |
619 | ||
557e56be PA |
620 | return gdbscm_wrap ([=] |
621 | { | |
622 | scoped_value_mark free_values; | |
ed3ef339 | 623 | |
4c693332 | 624 | gdb::unique_xmalloc_ptr<char> field = gdbscm_scm_to_c_string (field_scm); |
ed3ef339 | 625 | |
557e56be | 626 | struct value *tmp = v_smob->value; |
ed3ef339 | 627 | |
4c693332 | 628 | struct value *res_val = value_struct_elt (&tmp, NULL, field.get (), NULL, |
557e56be | 629 | "struct/class/union"); |
ed3ef339 | 630 | |
4c693332 | 631 | return vlscm_scm_from_value (res_val); |
557e56be | 632 | }); |
ed3ef339 DE |
633 | } |
634 | ||
635 | /* (value-subscript <gdb:value> integer|<gdb:value>) -> <gdb:value> | |
636 | Return the specified value in an array. */ | |
637 | ||
638 | static SCM | |
639 | gdbscm_value_subscript (SCM self, SCM index_scm) | |
640 | { | |
641 | value_smob *v_smob | |
642 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
643 | struct value *value = v_smob->value; | |
ed3ef339 | 644 | struct type *type = value_type (value); |
ed3ef339 DE |
645 | |
646 | SCM_ASSERT (type != NULL, self, SCM_ARG2, FUNC_NAME); | |
ed3ef339 | 647 | |
557e56be | 648 | return gdbscm_wrap ([=] |
ed3ef339 | 649 | { |
557e56be | 650 | scoped_value_mark free_values; |
ed3ef339 | 651 | |
557e56be PA |
652 | SCM except_scm; |
653 | struct value *index | |
654 | = vlscm_convert_value_from_scheme (FUNC_NAME, SCM_ARG2, index_scm, | |
655 | &except_scm, | |
656 | get_type_arch (type), | |
657 | current_language); | |
658 | if (index == NULL) | |
659 | return except_scm; | |
ed3ef339 DE |
660 | |
661 | /* Assume we are attempting an array access, and let the value code | |
662 | throw an exception if the index has an invalid type. | |
663 | Check the value's type is something that can be accessed via | |
664 | a subscript. */ | |
557e56be PA |
665 | struct value *tmp = coerce_ref (value); |
666 | struct type *tmp_type = check_typedef (value_type (tmp)); | |
667 | if (TYPE_CODE (tmp_type) != TYPE_CODE_ARRAY | |
668 | && TYPE_CODE (tmp_type) != TYPE_CODE_PTR) | |
ed3ef339 DE |
669 | error (_("Cannot subscript requested type")); |
670 | ||
557e56be PA |
671 | struct value *res_val = value_subscript (tmp, value_as_long (index)); |
672 | return vlscm_scm_from_value (res_val); | |
673 | }); | |
ed3ef339 DE |
674 | } |
675 | ||
676 | /* (value-call <gdb:value> arg-list) -> <gdb:value> | |
677 | Perform an inferior function call on the value. */ | |
678 | ||
679 | static SCM | |
680 | gdbscm_value_call (SCM self, SCM args) | |
681 | { | |
682 | value_smob *v_smob | |
683 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
684 | struct value *function = v_smob->value; | |
ed3ef339 DE |
685 | struct type *ftype = NULL; |
686 | long args_count; | |
687 | struct value **vargs = NULL; | |
ed3ef339 | 688 | |
680d7fd5 | 689 | gdbscm_gdb_exception exc {}; |
a70b8144 | 690 | try |
ed3ef339 DE |
691 | { |
692 | ftype = check_typedef (value_type (function)); | |
693 | } | |
230d2906 | 694 | catch (const gdb_exception &except) |
492d29ea | 695 | { |
680d7fd5 | 696 | exc = unpack (except); |
492d29ea | 697 | } |
ed3ef339 | 698 | |
680d7fd5 | 699 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
700 | SCM_ASSERT_TYPE (TYPE_CODE (ftype) == TYPE_CODE_FUNC, self, |
701 | SCM_ARG1, FUNC_NAME, | |
702 | _("function (value of TYPE_CODE_FUNC)")); | |
703 | ||
704 | SCM_ASSERT_TYPE (gdbscm_is_true (scm_list_p (args)), args, | |
705 | SCM_ARG2, FUNC_NAME, _("list")); | |
706 | ||
707 | args_count = scm_ilength (args); | |
708 | if (args_count > 0) | |
709 | { | |
710 | struct gdbarch *gdbarch = get_current_arch (); | |
711 | const struct language_defn *language = current_language; | |
712 | SCM except_scm; | |
713 | long i; | |
714 | ||
8d749320 | 715 | vargs = XALLOCAVEC (struct value *, args_count); |
ed3ef339 DE |
716 | for (i = 0; i < args_count; i++) |
717 | { | |
718 | SCM arg = scm_car (args); | |
719 | ||
720 | vargs[i] = vlscm_convert_value_from_scheme (FUNC_NAME, | |
721 | GDBSCM_ARG_NONE, arg, | |
722 | &except_scm, | |
723 | gdbarch, language); | |
724 | if (vargs[i] == NULL) | |
725 | gdbscm_throw (except_scm); | |
726 | ||
727 | args = scm_cdr (args); | |
728 | } | |
729 | gdb_assert (gdbscm_is_true (scm_null_p (args))); | |
730 | } | |
731 | ||
557e56be | 732 | return gdbscm_wrap ([=] |
ed3ef339 | 733 | { |
557e56be | 734 | scoped_value_mark free_values; |
ed3ef339 | 735 | |
e71585ff PA |
736 | auto av = gdb::make_array_view (vargs, args_count); |
737 | value *return_value = call_function_by_hand (function, NULL, av); | |
557e56be PA |
738 | return vlscm_scm_from_value (return_value); |
739 | }); | |
ed3ef339 DE |
740 | } |
741 | ||
742 | /* (value->bytevector <gdb:value>) -> bytevector */ | |
743 | ||
744 | static SCM | |
745 | gdbscm_value_to_bytevector (SCM self) | |
746 | { | |
747 | value_smob *v_smob | |
748 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
749 | struct value *value = v_smob->value; | |
750 | struct type *type; | |
751 | size_t length = 0; | |
752 | const gdb_byte *contents = NULL; | |
753 | SCM bv; | |
ed3ef339 DE |
754 | |
755 | type = value_type (value); | |
756 | ||
680d7fd5 | 757 | gdbscm_gdb_exception exc {}; |
a70b8144 | 758 | try |
ed3ef339 | 759 | { |
f168693b | 760 | type = check_typedef (type); |
ed3ef339 DE |
761 | length = TYPE_LENGTH (type); |
762 | contents = value_contents (value); | |
763 | } | |
230d2906 | 764 | catch (const gdb_exception &except) |
492d29ea | 765 | { |
680d7fd5 | 766 | exc = unpack (except); |
492d29ea | 767 | } |
ed3ef339 | 768 | |
680d7fd5 | 769 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
770 | bv = scm_c_make_bytevector (length); |
771 | memcpy (SCM_BYTEVECTOR_CONTENTS (bv), contents, length); | |
772 | ||
773 | return bv; | |
774 | } | |
775 | ||
776 | /* Helper function to determine if a type is "int-like". */ | |
777 | ||
778 | static int | |
779 | is_intlike (struct type *type, int ptr_ok) | |
780 | { | |
781 | return (TYPE_CODE (type) == TYPE_CODE_INT | |
782 | || TYPE_CODE (type) == TYPE_CODE_ENUM | |
783 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
784 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
785 | || (ptr_ok && TYPE_CODE (type) == TYPE_CODE_PTR)); | |
786 | } | |
787 | ||
788 | /* (value->bool <gdb:value>) -> boolean | |
789 | Throws an error if the value is not integer-like. */ | |
790 | ||
791 | static SCM | |
792 | gdbscm_value_to_bool (SCM self) | |
793 | { | |
794 | value_smob *v_smob | |
795 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
796 | struct value *value = v_smob->value; | |
797 | struct type *type; | |
798 | LONGEST l = 0; | |
ed3ef339 DE |
799 | |
800 | type = value_type (value); | |
801 | ||
680d7fd5 | 802 | gdbscm_gdb_exception exc {}; |
a70b8144 | 803 | try |
ed3ef339 | 804 | { |
f168693b | 805 | type = check_typedef (type); |
ed3ef339 | 806 | } |
230d2906 | 807 | catch (const gdb_exception &except) |
492d29ea | 808 | { |
680d7fd5 | 809 | exc = unpack (except); |
492d29ea | 810 | } |
ed3ef339 | 811 | |
680d7fd5 | 812 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
813 | SCM_ASSERT_TYPE (is_intlike (type, 1), self, SCM_ARG1, FUNC_NAME, |
814 | _("integer-like gdb value")); | |
815 | ||
a70b8144 | 816 | try |
ed3ef339 DE |
817 | { |
818 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
819 | l = value_as_address (value); | |
820 | else | |
821 | l = value_as_long (value); | |
822 | } | |
230d2906 | 823 | catch (const gdb_exception &except) |
492d29ea | 824 | { |
680d7fd5 | 825 | exc = unpack (except); |
492d29ea | 826 | } |
ed3ef339 | 827 | |
680d7fd5 | 828 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
829 | return scm_from_bool (l != 0); |
830 | } | |
831 | ||
832 | /* (value->integer <gdb:value>) -> integer | |
833 | Throws an error if the value is not integer-like. */ | |
834 | ||
835 | static SCM | |
836 | gdbscm_value_to_integer (SCM self) | |
837 | { | |
838 | value_smob *v_smob | |
839 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
840 | struct value *value = v_smob->value; | |
841 | struct type *type; | |
842 | LONGEST l = 0; | |
ed3ef339 DE |
843 | |
844 | type = value_type (value); | |
845 | ||
680d7fd5 | 846 | gdbscm_gdb_exception exc {}; |
a70b8144 | 847 | try |
ed3ef339 | 848 | { |
f168693b | 849 | type = check_typedef (type); |
ed3ef339 | 850 | } |
230d2906 | 851 | catch (const gdb_exception &except) |
492d29ea | 852 | { |
680d7fd5 | 853 | exc = unpack (except); |
492d29ea | 854 | } |
ed3ef339 | 855 | |
680d7fd5 | 856 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
857 | SCM_ASSERT_TYPE (is_intlike (type, 1), self, SCM_ARG1, FUNC_NAME, |
858 | _("integer-like gdb value")); | |
859 | ||
a70b8144 | 860 | try |
ed3ef339 DE |
861 | { |
862 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
863 | l = value_as_address (value); | |
864 | else | |
865 | l = value_as_long (value); | |
866 | } | |
230d2906 | 867 | catch (const gdb_exception &except) |
492d29ea | 868 | { |
680d7fd5 | 869 | exc = unpack (except); |
492d29ea | 870 | } |
ed3ef339 | 871 | |
680d7fd5 | 872 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
873 | if (TYPE_UNSIGNED (type)) |
874 | return gdbscm_scm_from_ulongest (l); | |
875 | else | |
876 | return gdbscm_scm_from_longest (l); | |
877 | } | |
878 | ||
879 | /* (value->real <gdb:value>) -> real | |
880 | Throws an error if the value is not a number. */ | |
881 | ||
882 | static SCM | |
883 | gdbscm_value_to_real (SCM self) | |
884 | { | |
885 | value_smob *v_smob | |
886 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
887 | struct value *value = v_smob->value; | |
888 | struct type *type; | |
14ad9311 UW |
889 | double d = 0; |
890 | struct value *check = nullptr; | |
ed3ef339 DE |
891 | |
892 | type = value_type (value); | |
893 | ||
680d7fd5 | 894 | gdbscm_gdb_exception exc {}; |
a70b8144 | 895 | try |
ed3ef339 | 896 | { |
f168693b | 897 | type = check_typedef (type); |
ed3ef339 | 898 | } |
230d2906 | 899 | catch (const gdb_exception &except) |
492d29ea | 900 | { |
680d7fd5 | 901 | exc = unpack (except); |
492d29ea | 902 | } |
ed3ef339 | 903 | |
680d7fd5 | 904 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
905 | SCM_ASSERT_TYPE (is_intlike (type, 0) || TYPE_CODE (type) == TYPE_CODE_FLT, |
906 | self, SCM_ARG1, FUNC_NAME, _("number")); | |
907 | ||
a70b8144 | 908 | try |
ed3ef339 | 909 | { |
14ad9311 UW |
910 | if (is_floating_value (value)) |
911 | { | |
912 | d = target_float_to_host_double (value_contents (value), type); | |
7584bb30 | 913 | check = value_from_host_double (type, d); |
14ad9311 UW |
914 | } |
915 | else if (TYPE_UNSIGNED (type)) | |
916 | { | |
917 | d = (ULONGEST) value_as_long (value); | |
918 | check = value_from_ulongest (type, (ULONGEST) d); | |
919 | } | |
920 | else | |
921 | { | |
922 | d = value_as_long (value); | |
923 | check = value_from_longest (type, (LONGEST) d); | |
924 | } | |
ed3ef339 | 925 | } |
230d2906 | 926 | catch (const gdb_exception &except) |
492d29ea | 927 | { |
680d7fd5 | 928 | exc = unpack (except); |
492d29ea | 929 | } |
ed3ef339 | 930 | |
680d7fd5 | 931 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 | 932 | /* TODO: Is there a better way to check if the value fits? */ |
14ad9311 | 933 | if (!value_equal (value, check)) |
ed3ef339 DE |
934 | gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG1, self, |
935 | _("number can't be converted to a double")); | |
936 | ||
937 | return scm_from_double (d); | |
938 | } | |
939 | ||
940 | /* (value->string <gdb:value> | |
941 | [#:encoding encoding] | |
942 | [#:errors #f | 'error | 'substitute] | |
943 | [#:length length]) | |
944 | -> string | |
945 | Return Unicode string with value's contents, which must be a string. | |
946 | ||
947 | If ENCODING is not given, the string is assumed to be encoded in | |
948 | the target's charset. | |
949 | ||
950 | ERRORS is one of #f, 'error or 'substitute. | |
d2929fdc DE |
951 | An error setting of #f means use the default, which is Guile's |
952 | %default-port-conversion-strategy when using Guile >= 2.0.6, or 'error if | |
953 | using an earlier version of Guile. Earlier versions do not properly | |
954 | support obtaining the default port conversion strategy. | |
955 | If the default is not one of 'error or 'substitute, 'substitute is used. | |
ed3ef339 DE |
956 | An error setting of "error" causes an exception to be thrown if there's |
957 | a decoding error. An error setting of "substitute" causes invalid | |
958 | characters to be replaced with "?". | |
959 | ||
960 | If LENGTH is provided, only fetch string to the length provided. | |
961 | LENGTH must be a Scheme integer, it can't be a <gdb:value> integer. */ | |
962 | ||
963 | static SCM | |
964 | gdbscm_value_to_string (SCM self, SCM rest) | |
965 | { | |
966 | value_smob *v_smob | |
967 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
968 | struct value *value = v_smob->value; | |
969 | const SCM keywords[] = { | |
970 | encoding_keyword, errors_keyword, length_keyword, SCM_BOOL_F | |
971 | }; | |
972 | int encoding_arg_pos = -1, errors_arg_pos = -1, length_arg_pos = -1; | |
973 | char *encoding = NULL; | |
974 | SCM errors = SCM_BOOL_F; | |
875e5398 TT |
975 | /* Avoid an uninitialized warning from gcc. */ |
976 | gdb_byte *buffer_contents = nullptr; | |
ed3ef339 | 977 | int length = -1; |
ed3ef339 DE |
978 | const char *la_encoding = NULL; |
979 | struct type *char_type = NULL; | |
980 | SCM result; | |
ed3ef339 DE |
981 | |
982 | /* The sequencing here, as everywhere else, is important. | |
983 | We can't have existing cleanups when a Scheme exception is thrown. */ | |
984 | ||
985 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, keywords, "#sOi", rest, | |
986 | &encoding_arg_pos, &encoding, | |
987 | &errors_arg_pos, &errors, | |
988 | &length_arg_pos, &length); | |
989 | ||
ed3ef339 DE |
990 | if (errors_arg_pos > 0 |
991 | && errors != SCM_BOOL_F | |
992 | && !scm_is_eq (errors, error_symbol) | |
993 | && !scm_is_eq (errors, substitute_symbol)) | |
994 | { | |
995 | SCM excp | |
996 | = gdbscm_make_out_of_range_error (FUNC_NAME, errors_arg_pos, errors, | |
997 | _("invalid error kind")); | |
998 | ||
557e56be | 999 | xfree (encoding); |
ed3ef339 DE |
1000 | gdbscm_throw (excp); |
1001 | } | |
1002 | if (errors == SCM_BOOL_F) | |
d2929fdc DE |
1003 | { |
1004 | /* N.B. scm_port_conversion_strategy in Guile versions prior to 2.0.6 | |
1005 | will throw a Scheme error when passed #f. */ | |
1006 | if (gdbscm_guile_version_is_at_least (2, 0, 6)) | |
1007 | errors = scm_port_conversion_strategy (SCM_BOOL_F); | |
1008 | else | |
1009 | errors = error_symbol; | |
1010 | } | |
ed3ef339 DE |
1011 | /* We don't assume anything about the result of scm_port_conversion_strategy. |
1012 | From this point on, if errors is not 'errors, use 'substitute. */ | |
1013 | ||
680d7fd5 | 1014 | gdbscm_gdb_exception exc {}; |
a70b8144 | 1015 | try |
ed3ef339 | 1016 | { |
557e56be | 1017 | gdb::unique_xmalloc_ptr<gdb_byte> buffer; |
91ae903f | 1018 | c_get_string (value, &buffer, &length, &char_type, &la_encoding); |
557e56be | 1019 | buffer_contents = buffer.release (); |
ed3ef339 | 1020 | } |
230d2906 | 1021 | catch (const gdb_exception &except) |
492d29ea | 1022 | { |
557e56be | 1023 | xfree (encoding); |
680d7fd5 | 1024 | exc = unpack (except); |
492d29ea | 1025 | } |
680d7fd5 | 1026 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 | 1027 | |
557e56be | 1028 | /* If errors is "error", scm_from_stringn may throw a Scheme exception. |
ed3ef339 | 1029 | Make sure we don't leak. This is done via scm_dynwind_begin, et.al. */ |
ed3ef339 | 1030 | |
c6486df5 | 1031 | scm_dynwind_begin ((scm_t_dynwind_flags) 0); |
ed3ef339 DE |
1032 | |
1033 | gdbscm_dynwind_xfree (encoding); | |
b4be9fad | 1034 | gdbscm_dynwind_xfree (buffer_contents); |
ed3ef339 | 1035 | |
b4be9fad | 1036 | result = scm_from_stringn ((const char *) buffer_contents, |
ed3ef339 DE |
1037 | length * TYPE_LENGTH (char_type), |
1038 | (encoding != NULL && *encoding != '\0' | |
1039 | ? encoding | |
1040 | : la_encoding), | |
1041 | scm_is_eq (errors, error_symbol) | |
1042 | ? SCM_FAILED_CONVERSION_ERROR | |
1043 | : SCM_FAILED_CONVERSION_QUESTION_MARK); | |
1044 | ||
1045 | scm_dynwind_end (); | |
1046 | ||
1047 | return result; | |
1048 | } | |
1049 | ||
1050 | /* (value->lazy-string <gdb:value> [#:encoding encoding] [#:length length]) | |
1051 | -> <gdb:lazy-string> | |
1052 | Return a Scheme object representing a lazy_string_object type. | |
1053 | A lazy string is a pointer to a string with an optional encoding and length. | |
1054 | If ENCODING is not given, the target's charset is used. | |
a7c0469f DE |
1055 | If LENGTH is provided then the length parameter is set to LENGTH. |
1056 | Otherwise if the value is an array of known length then the array's length | |
1057 | is used. Otherwise the length will be set to -1 (meaning first null of | |
1058 | appropriate with). | |
ed3ef339 DE |
1059 | LENGTH must be a Scheme integer, it can't be a <gdb:value> integer. */ |
1060 | ||
1061 | static SCM | |
1062 | gdbscm_value_to_lazy_string (SCM self, SCM rest) | |
1063 | { | |
1064 | value_smob *v_smob | |
1065 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
1066 | struct value *value = v_smob->value; | |
1067 | const SCM keywords[] = { encoding_keyword, length_keyword, SCM_BOOL_F }; | |
1068 | int encoding_arg_pos = -1, length_arg_pos = -1; | |
1069 | char *encoding = NULL; | |
1070 | int length = -1; | |
1071 | SCM result = SCM_BOOL_F; /* -Wall */ | |
680d7fd5 | 1072 | gdbscm_gdb_exception except {}; |
ed3ef339 DE |
1073 | |
1074 | /* The sequencing here, as everywhere else, is important. | |
1075 | We can't have existing cleanups when a Scheme exception is thrown. */ | |
1076 | ||
1077 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG2, keywords, "#si", rest, | |
1078 | &encoding_arg_pos, &encoding, | |
1079 | &length_arg_pos, &length); | |
1080 | ||
a7c0469f DE |
1081 | if (length < -1) |
1082 | { | |
1083 | gdbscm_out_of_range_error (FUNC_NAME, length_arg_pos, | |
1084 | scm_from_int (length), | |
1085 | _("invalid length")); | |
1086 | } | |
1087 | ||
a70b8144 | 1088 | try |
ed3ef339 | 1089 | { |
557e56be PA |
1090 | scoped_value_mark free_values; |
1091 | ||
a7c0469f DE |
1092 | struct type *type, *realtype; |
1093 | CORE_ADDR addr; | |
ed3ef339 | 1094 | |
a7c0469f DE |
1095 | type = value_type (value); |
1096 | realtype = check_typedef (type); | |
1097 | ||
1098 | switch (TYPE_CODE (realtype)) | |
1099 | { | |
1100 | case TYPE_CODE_ARRAY: | |
1101 | { | |
1102 | LONGEST array_length = -1; | |
1103 | LONGEST low_bound, high_bound; | |
1104 | ||
1105 | /* PR 20786: There's no way to specify an array of length zero. | |
1106 | Record a length of [0,-1] which is how Ada does it. Anything | |
1107 | we do is broken, but this one possible solution. */ | |
1108 | if (get_array_bounds (realtype, &low_bound, &high_bound)) | |
1109 | array_length = high_bound - low_bound + 1; | |
1110 | if (length == -1) | |
1111 | length = array_length; | |
1112 | else if (array_length == -1) | |
1113 | { | |
1114 | type = lookup_array_range_type (TYPE_TARGET_TYPE (realtype), | |
1115 | 0, length - 1); | |
1116 | } | |
1117 | else if (length != array_length) | |
1118 | { | |
1119 | /* We need to create a new array type with the | |
1120 | specified length. */ | |
1121 | if (length > array_length) | |
1122 | error (_("length is larger than array size")); | |
1123 | type = lookup_array_range_type (TYPE_TARGET_TYPE (type), | |
1124 | low_bound, | |
1125 | low_bound + length - 1); | |
1126 | } | |
1127 | addr = value_address (value); | |
1128 | break; | |
1129 | } | |
1130 | case TYPE_CODE_PTR: | |
1131 | /* If a length is specified we defer creating an array of the | |
1132 | specified width until we need to. */ | |
1133 | addr = value_as_address (value); | |
1134 | break; | |
1135 | default: | |
1136 | /* Should flag an error here. PR 20769. */ | |
1137 | addr = value_address (value); | |
1138 | break; | |
1139 | } | |
ed3ef339 | 1140 | |
a7c0469f | 1141 | result = lsscm_make_lazy_string (addr, length, encoding, type); |
ed3ef339 | 1142 | } |
230d2906 | 1143 | catch (const gdb_exception &ex) |
492d29ea | 1144 | { |
680d7fd5 | 1145 | except = unpack (ex); |
492d29ea | 1146 | } |
492d29ea | 1147 | |
557e56be | 1148 | xfree (encoding); |
ed3ef339 DE |
1149 | GDBSCM_HANDLE_GDB_EXCEPTION (except); |
1150 | ||
1151 | if (gdbscm_is_exception (result)) | |
1152 | gdbscm_throw (result); | |
1153 | ||
1154 | return result; | |
1155 | } | |
1156 | ||
1157 | /* (value-lazy? <gdb:value>) -> boolean */ | |
1158 | ||
1159 | static SCM | |
1160 | gdbscm_value_lazy_p (SCM self) | |
1161 | { | |
1162 | value_smob *v_smob | |
1163 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
1164 | struct value *value = v_smob->value; | |
1165 | ||
1166 | return scm_from_bool (value_lazy (value)); | |
1167 | } | |
1168 | ||
1169 | /* (value-fetch-lazy! <gdb:value>) -> unspecified */ | |
1170 | ||
1171 | static SCM | |
1172 | gdbscm_value_fetch_lazy_x (SCM self) | |
1173 | { | |
1174 | value_smob *v_smob | |
1175 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
1176 | struct value *value = v_smob->value; | |
ed3ef339 | 1177 | |
557e56be | 1178 | return gdbscm_wrap ([=] |
ed3ef339 DE |
1179 | { |
1180 | if (value_lazy (value)) | |
1181 | value_fetch_lazy (value); | |
557e56be PA |
1182 | return SCM_UNSPECIFIED; |
1183 | }); | |
ed3ef339 DE |
1184 | } |
1185 | ||
1186 | /* (value-print <gdb:value>) -> string */ | |
1187 | ||
1188 | static SCM | |
1189 | gdbscm_value_print (SCM self) | |
1190 | { | |
1191 | value_smob *v_smob | |
1192 | = vlscm_get_value_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME); | |
1193 | struct value *value = v_smob->value; | |
1194 | struct value_print_options opts; | |
ed3ef339 DE |
1195 | |
1196 | get_user_print_options (&opts); | |
1197 | opts.deref_ref = 0; | |
1198 | ||
d7e74731 PA |
1199 | string_file stb; |
1200 | ||
680d7fd5 | 1201 | gdbscm_gdb_exception exc {}; |
a70b8144 | 1202 | try |
ed3ef339 | 1203 | { |
d7e74731 | 1204 | common_val_print (value, &stb, 0, &opts, current_language); |
ed3ef339 | 1205 | } |
230d2906 | 1206 | catch (const gdb_exception &except) |
492d29ea | 1207 | { |
680d7fd5 | 1208 | exc = unpack (except); |
492d29ea | 1209 | } |
ed3ef339 | 1210 | |
680d7fd5 | 1211 | GDBSCM_HANDLE_GDB_EXCEPTION (exc); |
ed3ef339 DE |
1212 | /* Use SCM_FAILED_CONVERSION_QUESTION_MARK to ensure this doesn't |
1213 | throw an error if the encoding fails. | |
1214 | IWBN to use scm_take_locale_string here, but we'd have to temporarily | |
1215 | override the default port conversion handler because contrary to | |
1216 | documentation it doesn't necessarily free the input string. */ | |
d7e74731 PA |
1217 | return scm_from_stringn (stb.c_str (), stb.size (), host_charset (), |
1218 | SCM_FAILED_CONVERSION_QUESTION_MARK); | |
ed3ef339 DE |
1219 | } |
1220 | \f | |
1221 | /* (parse-and-eval string) -> <gdb:value> | |
1222 | Parse a string and evaluate the string as an expression. */ | |
1223 | ||
1224 | static SCM | |
1225 | gdbscm_parse_and_eval (SCM expr_scm) | |
1226 | { | |
1227 | char *expr_str; | |
ed3ef339 DE |
1228 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, NULL, "s", |
1229 | expr_scm, &expr_str); | |
1230 | ||
557e56be | 1231 | return gdbscm_wrap ([=] |
492d29ea | 1232 | { |
557e56be PA |
1233 | scoped_value_mark free_values; |
1234 | return vlscm_scm_from_value (parse_and_eval (expr_str)); | |
1235 | }); | |
ed3ef339 DE |
1236 | } |
1237 | ||
1238 | /* (history-ref integer) -> <gdb:value> | |
1239 | Return the specified value from GDB's value history. */ | |
1240 | ||
1241 | static SCM | |
1242 | gdbscm_history_ref (SCM index) | |
1243 | { | |
1244 | int i; | |
ed3ef339 DE |
1245 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, NULL, "i", index, &i); |
1246 | ||
557e56be | 1247 | return gdbscm_wrap ([=] |
ed3ef339 | 1248 | { |
557e56be PA |
1249 | return vlscm_scm_from_value (access_value_history (i)); |
1250 | }); | |
ed3ef339 | 1251 | } |
7a5a839f LC |
1252 | |
1253 | /* (history-append! <gdb:value>) -> index | |
1254 | Append VALUE to GDB's value history. Return its index in the history. */ | |
1255 | ||
1256 | static SCM | |
1257 | gdbscm_history_append_x (SCM value) | |
1258 | { | |
557e56be PA |
1259 | value_smob *v_smob |
1260 | = vlscm_get_value_smob_arg_unsafe (value, SCM_ARG1, FUNC_NAME); | |
1261 | return gdbscm_wrap ([=] | |
492d29ea | 1262 | { |
557e56be PA |
1263 | return scm_from_int (record_latest_value (v_smob->value)); |
1264 | }); | |
7a5a839f | 1265 | } |
ed3ef339 DE |
1266 | \f |
1267 | /* Initialize the Scheme value code. */ | |
1268 | ||
1269 | static const scheme_function value_functions[] = | |
1270 | { | |
72e02483 | 1271 | { "value?", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_p), |
ed3ef339 DE |
1272 | "\ |
1273 | Return #t if the object is a <gdb:value> object." }, | |
1274 | ||
72e02483 | 1275 | { "make-value", 1, 0, 1, as_a_scm_t_subr (gdbscm_make_value), |
ed3ef339 DE |
1276 | "\ |
1277 | Create a <gdb:value> representing object.\n\ | |
1278 | Typically this is used to convert numbers and strings to\n\ | |
1279 | <gdb:value> objects.\n\ | |
1280 | \n\ | |
1281 | Arguments: object [#:type <gdb:type>]" }, | |
1282 | ||
72e02483 PA |
1283 | { "value-optimized-out?", 1, 0, 0, |
1284 | as_a_scm_t_subr (gdbscm_value_optimized_out_p), | |
ed3ef339 DE |
1285 | "\ |
1286 | Return #t if the value has been optimizd out." }, | |
1287 | ||
72e02483 | 1288 | { "value-address", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_address), |
ed3ef339 DE |
1289 | "\ |
1290 | Return the address of the value." }, | |
1291 | ||
72e02483 | 1292 | { "value-type", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_type), |
ed3ef339 DE |
1293 | "\ |
1294 | Return the type of the value." }, | |
1295 | ||
72e02483 | 1296 | { "value-dynamic-type", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_dynamic_type), |
ed3ef339 DE |
1297 | "\ |
1298 | Return the dynamic type of the value." }, | |
1299 | ||
72e02483 | 1300 | { "value-cast", 2, 0, 0, as_a_scm_t_subr (gdbscm_value_cast), |
ed3ef339 DE |
1301 | "\ |
1302 | Cast the value to the supplied type.\n\ | |
1303 | \n\ | |
1304 | Arguments: <gdb:value> <gdb:type>" }, | |
1305 | ||
72e02483 | 1306 | { "value-dynamic-cast", 2, 0, 0, as_a_scm_t_subr (gdbscm_value_dynamic_cast), |
ed3ef339 DE |
1307 | "\ |
1308 | Cast the value to the supplied type, as if by the C++\n\ | |
1309 | dynamic_cast operator.\n\ | |
1310 | \n\ | |
1311 | Arguments: <gdb:value> <gdb:type>" }, | |
1312 | ||
72e02483 PA |
1313 | { "value-reinterpret-cast", 2, 0, 0, |
1314 | as_a_scm_t_subr (gdbscm_value_reinterpret_cast), | |
ed3ef339 DE |
1315 | "\ |
1316 | Cast the value to the supplied type, as if by the C++\n\ | |
1317 | reinterpret_cast operator.\n\ | |
1318 | \n\ | |
1319 | Arguments: <gdb:value> <gdb:type>" }, | |
1320 | ||
72e02483 | 1321 | { "value-dereference", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_dereference), |
ed3ef339 DE |
1322 | "\ |
1323 | Return the result of applying the C unary * operator to the value." }, | |
1324 | ||
72e02483 PA |
1325 | { "value-referenced-value", 1, 0, 0, |
1326 | as_a_scm_t_subr (gdbscm_value_referenced_value), | |
ed3ef339 DE |
1327 | "\ |
1328 | Given a value of a reference type, return the value referenced.\n\ | |
1329 | The difference between this function and value-dereference is that\n\ | |
1330 | the latter applies * unary operator to a value, which need not always\n\ | |
1331 | result in the value referenced.\n\ | |
1332 | For example, for a value which is a reference to an 'int' pointer ('int *'),\n\ | |
1333 | value-dereference will result in a value of type 'int' while\n\ | |
1334 | value-referenced-value will result in a value of type 'int *'." }, | |
1335 | ||
72e02483 | 1336 | { "value-field", 2, 0, 0, as_a_scm_t_subr (gdbscm_value_field), |
ed3ef339 DE |
1337 | "\ |
1338 | Return the specified field of the value.\n\ | |
1339 | \n\ | |
1340 | Arguments: <gdb:value> string" }, | |
1341 | ||
72e02483 | 1342 | { "value-subscript", 2, 0, 0, as_a_scm_t_subr (gdbscm_value_subscript), |
ed3ef339 DE |
1343 | "\ |
1344 | Return the value of the array at the specified index.\n\ | |
1345 | \n\ | |
1346 | Arguments: <gdb:value> integer" }, | |
1347 | ||
72e02483 | 1348 | { "value-call", 2, 0, 0, as_a_scm_t_subr (gdbscm_value_call), |
ed3ef339 DE |
1349 | "\ |
1350 | Perform an inferior function call taking the value as a pointer to the\n\ | |
1351 | function to call.\n\ | |
1352 | Each element of the argument list must be a <gdb:value> object or an object\n\ | |
1353 | that can be converted to one.\n\ | |
1354 | The result is the value returned by the function.\n\ | |
1355 | \n\ | |
1356 | Arguments: <gdb:value> arg-list" }, | |
1357 | ||
72e02483 | 1358 | { "value->bool", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_to_bool), |
ed3ef339 DE |
1359 | "\ |
1360 | Return the Scheme boolean representing the GDB value.\n\ | |
1361 | The value must be \"integer like\". Pointers are ok." }, | |
1362 | ||
72e02483 | 1363 | { "value->integer", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_to_integer), |
ed3ef339 DE |
1364 | "\ |
1365 | Return the Scheme integer representing the GDB value.\n\ | |
1366 | The value must be \"integer like\". Pointers are ok." }, | |
1367 | ||
72e02483 | 1368 | { "value->real", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_to_real), |
ed3ef339 DE |
1369 | "\ |
1370 | Return the Scheme real number representing the GDB value.\n\ | |
1371 | The value must be a number." }, | |
1372 | ||
72e02483 | 1373 | { "value->bytevector", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_to_bytevector), |
ed3ef339 DE |
1374 | "\ |
1375 | Return a Scheme bytevector with the raw contents of the GDB value.\n\ | |
1376 | No transformation, endian or otherwise, is performed." }, | |
1377 | ||
72e02483 | 1378 | { "value->string", 1, 0, 1, as_a_scm_t_subr (gdbscm_value_to_string), |
ed3ef339 DE |
1379 | "\ |
1380 | Return the Unicode string of the value's contents.\n\ | |
1381 | If ENCODING is not given, the string is assumed to be encoded in\n\ | |
1382 | the target's charset.\n\ | |
1383 | An error setting \"error\" causes an exception to be thrown if there's\n\ | |
1384 | a decoding error. An error setting of \"substitute\" causes invalid\n\ | |
1385 | characters to be replaced with \"?\". The default is \"error\".\n\ | |
1386 | If LENGTH is provided, only fetch string to the length provided.\n\ | |
1387 | \n\ | |
1388 | Arguments: <gdb:value>\n\ | |
1389 | [#:encoding encoding] [#:errors \"error\"|\"substitute\"]\n\ | |
1390 | [#:length length]" }, | |
1391 | ||
72e02483 PA |
1392 | { "value->lazy-string", 1, 0, 1, |
1393 | as_a_scm_t_subr (gdbscm_value_to_lazy_string), | |
ed3ef339 DE |
1394 | "\ |
1395 | Return a Scheme object representing a lazily fetched Unicode string\n\ | |
1396 | of the value's contents.\n\ | |
1397 | If ENCODING is not given, the string is assumed to be encoded in\n\ | |
1398 | the target's charset.\n\ | |
1399 | If LENGTH is provided, only fetch string to the length provided.\n\ | |
1400 | \n\ | |
1401 | Arguments: <gdb:value> [#:encoding encoding] [#:length length]" }, | |
1402 | ||
72e02483 | 1403 | { "value-lazy?", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_lazy_p), |
ed3ef339 DE |
1404 | "\ |
1405 | Return #t if the value is lazy (not fetched yet from the inferior).\n\ | |
1406 | A lazy value is fetched when needed, or when the value-fetch-lazy! function\n\ | |
1407 | is called." }, | |
1408 | ||
72e02483 | 1409 | { "make-lazy-value", 2, 0, 0, as_a_scm_t_subr (gdbscm_make_lazy_value), |
ed3ef339 DE |
1410 | "\ |
1411 | Create a <gdb:value> that will be lazily fetched from the target.\n\ | |
1412 | \n\ | |
1413 | Arguments: <gdb:type> address" }, | |
1414 | ||
72e02483 | 1415 | { "value-fetch-lazy!", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_fetch_lazy_x), |
ed3ef339 DE |
1416 | "\ |
1417 | Fetch the value from the inferior, if it was lazy.\n\ | |
1418 | The result is \"unspecified\"." }, | |
1419 | ||
72e02483 | 1420 | { "value-print", 1, 0, 0, as_a_scm_t_subr (gdbscm_value_print), |
ed3ef339 DE |
1421 | "\ |
1422 | Return the string representation (print form) of the value." }, | |
1423 | ||
72e02483 | 1424 | { "parse-and-eval", 1, 0, 0, as_a_scm_t_subr (gdbscm_parse_and_eval), |
ed3ef339 DE |
1425 | "\ |
1426 | Evaluates string in gdb and returns the result as a <gdb:value> object." }, | |
1427 | ||
72e02483 | 1428 | { "history-ref", 1, 0, 0, as_a_scm_t_subr (gdbscm_history_ref), |
ed3ef339 DE |
1429 | "\ |
1430 | Return the specified value from GDB's value history." }, | |
1431 | ||
72e02483 | 1432 | { "history-append!", 1, 0, 0, as_a_scm_t_subr (gdbscm_history_append_x), |
7a5a839f LC |
1433 | "\ |
1434 | Append the specified value onto GDB's value history." }, | |
1435 | ||
ed3ef339 DE |
1436 | END_FUNCTIONS |
1437 | }; | |
1438 | ||
1439 | void | |
1440 | gdbscm_initialize_values (void) | |
1441 | { | |
1442 | value_smob_tag = gdbscm_make_smob_type (value_smob_name, | |
1443 | sizeof (value_smob)); | |
ed3ef339 DE |
1444 | scm_set_smob_free (value_smob_tag, vlscm_free_value_smob); |
1445 | scm_set_smob_print (value_smob_tag, vlscm_print_value_smob); | |
1446 | scm_set_smob_equalp (value_smob_tag, vlscm_equal_p_value_smob); | |
1447 | ||
1448 | gdbscm_define_functions (value_functions, 1); | |
1449 | ||
1450 | type_keyword = scm_from_latin1_keyword ("type"); | |
1451 | encoding_keyword = scm_from_latin1_keyword ("encoding"); | |
1452 | errors_keyword = scm_from_latin1_keyword ("errors"); | |
1453 | length_keyword = scm_from_latin1_keyword ("length"); | |
1454 | ||
1455 | error_symbol = scm_from_latin1_symbol ("error"); | |
1456 | escape_symbol = scm_from_latin1_symbol ("escape"); | |
1457 | substitute_symbol = scm_from_latin1_symbol ("substitute"); | |
1458 | } |