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99ad9427 YQ |
1 | /* varobj support for C and C++. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 1999-2014 Free Software Foundation, Inc. |
99ad9427 YQ |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include "defs.h" | |
19 | #include "value.h" | |
20 | #include "varobj.h" | |
21 | #include "gdbthread.h" | |
22 | #include "valprint.h" | |
23 | ||
24 | static void cplus_class_num_children (struct type *type, int children[3]); | |
25 | ||
26 | /* The names of varobjs representing anonymous structs or unions. */ | |
27 | #define ANONYMOUS_STRUCT_NAME _("<anonymous struct>") | |
28 | #define ANONYMOUS_UNION_NAME _("<anonymous union>") | |
29 | ||
30 | /* Does CHILD represent a child with no name? This happens when | |
31 | the child is an anonmous struct or union and it has no field name | |
32 | in its parent variable. | |
33 | ||
34 | This has already been determined by *_describe_child. The easiest | |
35 | thing to do is to compare the child's name with ANONYMOUS_*_NAME. */ | |
36 | ||
37 | int | |
38 | varobj_is_anonymous_child (struct varobj *child) | |
39 | { | |
40 | return (strcmp (child->name, ANONYMOUS_STRUCT_NAME) == 0 | |
41 | || strcmp (child->name, ANONYMOUS_UNION_NAME) == 0); | |
42 | } | |
43 | ||
44 | /* Given the value and the type of a variable object, | |
45 | adjust the value and type to those necessary | |
46 | for getting children of the variable object. | |
47 | This includes dereferencing top-level references | |
48 | to all types and dereferencing pointers to | |
49 | structures. | |
50 | ||
51 | If LOOKUP_ACTUAL_TYPE is set the enclosing type of the | |
52 | value will be fetched and if it differs from static type | |
53 | the value will be casted to it. | |
54 | ||
55 | Both TYPE and *TYPE should be non-null. VALUE | |
56 | can be null if we want to only translate type. | |
57 | *VALUE can be null as well -- if the parent | |
58 | value is not known. | |
59 | ||
60 | If WAS_PTR is not NULL, set *WAS_PTR to 0 or 1 | |
61 | depending on whether pointer was dereferenced | |
62 | in this function. */ | |
63 | ||
64 | static void | |
65 | adjust_value_for_child_access (struct value **value, | |
66 | struct type **type, | |
67 | int *was_ptr, | |
68 | int lookup_actual_type) | |
69 | { | |
70 | gdb_assert (type && *type); | |
71 | ||
72 | if (was_ptr) | |
73 | *was_ptr = 0; | |
74 | ||
75 | *type = check_typedef (*type); | |
76 | ||
77 | /* The type of value stored in varobj, that is passed | |
78 | to us, is already supposed to be | |
79 | reference-stripped. */ | |
80 | ||
81 | gdb_assert (TYPE_CODE (*type) != TYPE_CODE_REF); | |
82 | ||
83 | /* Pointers to structures are treated just like | |
84 | structures when accessing children. Don't | |
85 | dererences pointers to other types. */ | |
86 | if (TYPE_CODE (*type) == TYPE_CODE_PTR) | |
87 | { | |
88 | struct type *target_type = get_target_type (*type); | |
89 | if (TYPE_CODE (target_type) == TYPE_CODE_STRUCT | |
90 | || TYPE_CODE (target_type) == TYPE_CODE_UNION) | |
91 | { | |
92 | if (value && *value) | |
93 | { | |
94 | volatile struct gdb_exception except; | |
95 | ||
96 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
97 | { | |
98 | *value = value_ind (*value); | |
99 | } | |
100 | ||
101 | if (except.reason < 0) | |
102 | *value = NULL; | |
103 | } | |
104 | *type = target_type; | |
105 | if (was_ptr) | |
106 | *was_ptr = 1; | |
107 | } | |
108 | } | |
109 | ||
110 | /* The 'get_target_type' function calls check_typedef on | |
111 | result, so we can immediately check type code. No | |
112 | need to call check_typedef here. */ | |
113 | ||
114 | /* Access a real type of the value (if necessary and possible). */ | |
115 | if (value && *value && lookup_actual_type) | |
116 | { | |
117 | struct type *enclosing_type; | |
118 | int real_type_found = 0; | |
119 | ||
120 | enclosing_type = value_actual_type (*value, 1, &real_type_found); | |
121 | if (real_type_found) | |
122 | { | |
123 | *type = enclosing_type; | |
124 | *value = value_cast (enclosing_type, *value); | |
125 | } | |
126 | } | |
127 | } | |
128 | ||
9a9a7608 AB |
129 | /* Is VAR a path expression parent, i.e., can it be used to construct |
130 | a valid path expression? */ | |
131 | ||
132 | static int | |
133 | c_is_path_expr_parent (struct varobj *var) | |
134 | { | |
135 | struct type *type; | |
136 | ||
137 | /* "Fake" children are not path_expr parents. */ | |
138 | if (CPLUS_FAKE_CHILD (var)) | |
139 | return 0; | |
140 | ||
141 | type = varobj_get_gdb_type (var); | |
142 | ||
143 | /* Anonymous unions and structs are also not path_expr parents. */ | |
144 | if ((TYPE_CODE (type) == TYPE_CODE_STRUCT | |
145 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
146 | && TYPE_NAME (type) == NULL | |
147 | && TYPE_TAG_NAME (type) == NULL) | |
148 | { | |
149 | struct varobj *parent = var->parent; | |
150 | ||
151 | while (parent != NULL && CPLUS_FAKE_CHILD (parent)) | |
152 | parent = parent->parent; | |
153 | ||
154 | if (parent != NULL) | |
155 | { | |
156 | struct type *parent_type; | |
157 | int was_ptr; | |
158 | ||
159 | parent_type = varobj_get_value_type (parent); | |
160 | adjust_value_for_child_access (NULL, &parent_type, &was_ptr, 0); | |
161 | ||
162 | if (TYPE_CODE (parent_type) == TYPE_CODE_STRUCT | |
163 | || TYPE_CODE (parent_type) == TYPE_CODE_UNION) | |
164 | { | |
165 | const char *field_name; | |
166 | ||
167 | gdb_assert (var->index < TYPE_NFIELDS (parent_type)); | |
168 | field_name = TYPE_FIELD_NAME (parent_type, var->index); | |
169 | return !(field_name == NULL || *field_name == '\0'); | |
170 | } | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | return 1; | |
177 | } | |
178 | ||
99ad9427 YQ |
179 | /* C */ |
180 | ||
181 | static int | |
182 | c_number_of_children (struct varobj *var) | |
183 | { | |
184 | struct type *type = varobj_get_value_type (var); | |
185 | int children = 0; | |
186 | struct type *target; | |
187 | ||
188 | adjust_value_for_child_access (NULL, &type, NULL, 0); | |
189 | target = get_target_type (type); | |
190 | ||
191 | switch (TYPE_CODE (type)) | |
192 | { | |
193 | case TYPE_CODE_ARRAY: | |
194 | if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (target) > 0 | |
195 | && !TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type)) | |
196 | children = TYPE_LENGTH (type) / TYPE_LENGTH (target); | |
197 | else | |
198 | /* If we don't know how many elements there are, don't display | |
199 | any. */ | |
200 | children = 0; | |
201 | break; | |
202 | ||
203 | case TYPE_CODE_STRUCT: | |
204 | case TYPE_CODE_UNION: | |
205 | children = TYPE_NFIELDS (type); | |
206 | break; | |
207 | ||
208 | case TYPE_CODE_PTR: | |
209 | /* The type here is a pointer to non-struct. Typically, pointers | |
210 | have one child, except for function ptrs, which have no children, | |
211 | and except for void*, as we don't know what to show. | |
212 | ||
213 | We can show char* so we allow it to be dereferenced. If you decide | |
214 | to test for it, please mind that a little magic is necessary to | |
215 | properly identify it: char* has TYPE_CODE == TYPE_CODE_INT and | |
216 | TYPE_NAME == "char". */ | |
217 | if (TYPE_CODE (target) == TYPE_CODE_FUNC | |
218 | || TYPE_CODE (target) == TYPE_CODE_VOID) | |
219 | children = 0; | |
220 | else | |
221 | children = 1; | |
222 | break; | |
223 | ||
224 | default: | |
225 | /* Other types have no children. */ | |
226 | break; | |
227 | } | |
228 | ||
229 | return children; | |
230 | } | |
231 | ||
232 | static char * | |
233 | c_name_of_variable (struct varobj *parent) | |
234 | { | |
235 | return xstrdup (parent->name); | |
236 | } | |
237 | ||
238 | /* Return the value of element TYPE_INDEX of a structure | |
239 | value VALUE. VALUE's type should be a structure, | |
240 | or union, or a typedef to struct/union. | |
241 | ||
242 | Returns NULL if getting the value fails. Never throws. */ | |
243 | ||
244 | static struct value * | |
245 | value_struct_element_index (struct value *value, int type_index) | |
246 | { | |
247 | struct value *result = NULL; | |
248 | volatile struct gdb_exception e; | |
249 | struct type *type = value_type (value); | |
250 | ||
251 | type = check_typedef (type); | |
252 | ||
253 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
254 | || TYPE_CODE (type) == TYPE_CODE_UNION); | |
255 | ||
256 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
257 | { | |
258 | if (field_is_static (&TYPE_FIELD (type, type_index))) | |
259 | result = value_static_field (type, type_index); | |
260 | else | |
261 | result = value_primitive_field (value, 0, type_index, type); | |
262 | } | |
263 | if (e.reason < 0) | |
264 | { | |
265 | return NULL; | |
266 | } | |
267 | else | |
268 | { | |
269 | return result; | |
270 | } | |
271 | } | |
272 | ||
273 | /* Obtain the information about child INDEX of the variable | |
274 | object PARENT. | |
275 | If CNAME is not null, sets *CNAME to the name of the child relative | |
276 | to the parent. | |
277 | If CVALUE is not null, sets *CVALUE to the value of the child. | |
278 | If CTYPE is not null, sets *CTYPE to the type of the child. | |
279 | ||
280 | If any of CNAME, CVALUE, or CTYPE is not null, but the corresponding | |
281 | information cannot be determined, set *CNAME, *CVALUE, or *CTYPE | |
282 | to NULL. */ | |
283 | ||
284 | static void | |
285 | c_describe_child (struct varobj *parent, int index, | |
286 | char **cname, struct value **cvalue, struct type **ctype, | |
287 | char **cfull_expression) | |
288 | { | |
289 | struct value *value = parent->value; | |
290 | struct type *type = varobj_get_value_type (parent); | |
291 | char *parent_expression = NULL; | |
292 | int was_ptr; | |
293 | volatile struct gdb_exception except; | |
294 | ||
295 | if (cname) | |
296 | *cname = NULL; | |
297 | if (cvalue) | |
298 | *cvalue = NULL; | |
299 | if (ctype) | |
300 | *ctype = NULL; | |
301 | if (cfull_expression) | |
302 | { | |
303 | *cfull_expression = NULL; | |
304 | parent_expression | |
305 | = varobj_get_path_expr (varobj_get_path_expr_parent (parent)); | |
306 | } | |
307 | adjust_value_for_child_access (&value, &type, &was_ptr, 0); | |
308 | ||
309 | switch (TYPE_CODE (type)) | |
310 | { | |
311 | case TYPE_CODE_ARRAY: | |
312 | if (cname) | |
313 | *cname | |
314 | = xstrdup (int_string (index | |
315 | + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)), | |
316 | 10, 1, 0, 0)); | |
317 | ||
318 | if (cvalue && value) | |
319 | { | |
320 | int real_index = index + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)); | |
321 | ||
322 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
323 | { | |
324 | *cvalue = value_subscript (value, real_index); | |
325 | } | |
326 | } | |
327 | ||
328 | if (ctype) | |
329 | *ctype = get_target_type (type); | |
330 | ||
331 | if (cfull_expression) | |
332 | *cfull_expression = | |
333 | xstrprintf ("(%s)[%s]", parent_expression, | |
334 | int_string (index | |
335 | + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)), | |
336 | 10, 1, 0, 0)); | |
337 | ||
338 | ||
339 | break; | |
340 | ||
341 | case TYPE_CODE_STRUCT: | |
342 | case TYPE_CODE_UNION: | |
343 | { | |
344 | const char *field_name; | |
345 | ||
346 | /* If the type is anonymous and the field has no name, | |
347 | set an appropriate name. */ | |
348 | field_name = TYPE_FIELD_NAME (type, index); | |
349 | if (field_name == NULL || *field_name == '\0') | |
350 | { | |
351 | if (cname) | |
352 | { | |
353 | if (TYPE_CODE (TYPE_FIELD_TYPE (type, index)) | |
354 | == TYPE_CODE_STRUCT) | |
355 | *cname = xstrdup (ANONYMOUS_STRUCT_NAME); | |
356 | else | |
357 | *cname = xstrdup (ANONYMOUS_UNION_NAME); | |
358 | } | |
359 | ||
360 | if (cfull_expression) | |
361 | *cfull_expression = xstrdup (""); | |
362 | } | |
363 | else | |
364 | { | |
365 | if (cname) | |
366 | *cname = xstrdup (field_name); | |
367 | ||
368 | if (cfull_expression) | |
369 | { | |
370 | char *join = was_ptr ? "->" : "."; | |
371 | ||
372 | *cfull_expression = xstrprintf ("(%s)%s%s", parent_expression, | |
373 | join, field_name); | |
374 | } | |
375 | } | |
376 | ||
377 | if (cvalue && value) | |
378 | { | |
379 | /* For C, varobj index is the same as type index. */ | |
380 | *cvalue = value_struct_element_index (value, index); | |
381 | } | |
382 | ||
383 | if (ctype) | |
384 | *ctype = TYPE_FIELD_TYPE (type, index); | |
385 | } | |
386 | break; | |
387 | ||
388 | case TYPE_CODE_PTR: | |
389 | if (cname) | |
390 | *cname = xstrprintf ("*%s", parent->name); | |
391 | ||
392 | if (cvalue && value) | |
393 | { | |
394 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
395 | { | |
396 | *cvalue = value_ind (value); | |
397 | } | |
398 | ||
399 | if (except.reason < 0) | |
400 | *cvalue = NULL; | |
401 | } | |
402 | ||
403 | /* Don't use get_target_type because it calls | |
404 | check_typedef and here, we want to show the true | |
405 | declared type of the variable. */ | |
406 | if (ctype) | |
407 | *ctype = TYPE_TARGET_TYPE (type); | |
408 | ||
409 | if (cfull_expression) | |
410 | *cfull_expression = xstrprintf ("*(%s)", parent_expression); | |
411 | ||
412 | break; | |
413 | ||
414 | default: | |
415 | /* This should not happen. */ | |
416 | if (cname) | |
417 | *cname = xstrdup ("???"); | |
418 | if (cfull_expression) | |
419 | *cfull_expression = xstrdup ("???"); | |
420 | /* Don't set value and type, we don't know then. */ | |
421 | } | |
422 | } | |
423 | ||
424 | static char * | |
425 | c_name_of_child (struct varobj *parent, int index) | |
426 | { | |
427 | char *name; | |
428 | ||
429 | c_describe_child (parent, index, &name, NULL, NULL, NULL); | |
430 | return name; | |
431 | } | |
432 | ||
433 | static char * | |
434 | c_path_expr_of_child (struct varobj *child) | |
435 | { | |
436 | c_describe_child (child->parent, child->index, NULL, NULL, NULL, | |
437 | &child->path_expr); | |
438 | return child->path_expr; | |
439 | } | |
440 | ||
441 | static struct value * | |
442 | c_value_of_child (struct varobj *parent, int index) | |
443 | { | |
444 | struct value *value = NULL; | |
445 | ||
446 | c_describe_child (parent, index, NULL, &value, NULL, NULL); | |
447 | return value; | |
448 | } | |
449 | ||
450 | static struct type * | |
451 | c_type_of_child (struct varobj *parent, int index) | |
452 | { | |
453 | struct type *type = NULL; | |
454 | ||
455 | c_describe_child (parent, index, NULL, NULL, &type, NULL); | |
456 | return type; | |
457 | } | |
458 | ||
459 | /* This returns the type of the variable. It also skips past typedefs | |
460 | to return the real type of the variable. */ | |
461 | ||
462 | static struct type * | |
463 | get_type (struct varobj *var) | |
464 | { | |
465 | struct type *type; | |
466 | ||
467 | type = var->type; | |
468 | if (type != NULL) | |
469 | type = check_typedef (type); | |
470 | ||
471 | return type; | |
472 | } | |
473 | ||
474 | static char * | |
475 | c_value_of_variable (struct varobj *var, enum varobj_display_formats format) | |
476 | { | |
477 | /* BOGUS: if val_print sees a struct/class, or a reference to one, | |
478 | it will print out its children instead of "{...}". So we need to | |
479 | catch that case explicitly. */ | |
480 | struct type *type = get_type (var); | |
481 | ||
482 | /* Strip top-level references. */ | |
483 | while (TYPE_CODE (type) == TYPE_CODE_REF) | |
484 | type = check_typedef (TYPE_TARGET_TYPE (type)); | |
485 | ||
486 | switch (TYPE_CODE (type)) | |
487 | { | |
488 | case TYPE_CODE_STRUCT: | |
489 | case TYPE_CODE_UNION: | |
490 | return xstrdup ("{...}"); | |
491 | /* break; */ | |
492 | ||
493 | case TYPE_CODE_ARRAY: | |
494 | { | |
495 | char *number; | |
496 | ||
497 | number = xstrprintf ("[%d]", var->num_children); | |
498 | return (number); | |
499 | } | |
500 | /* break; */ | |
501 | ||
502 | default: | |
503 | { | |
504 | if (var->value == NULL) | |
505 | { | |
506 | /* This can happen if we attempt to get the value of a struct | |
507 | member when the parent is an invalid pointer. This is an | |
508 | error condition, so we should tell the caller. */ | |
509 | return NULL; | |
510 | } | |
511 | else | |
512 | { | |
513 | if (var->not_fetched && value_lazy (var->value)) | |
514 | /* Frozen variable and no value yet. We don't | |
515 | implicitly fetch the value. MI response will | |
516 | use empty string for the value, which is OK. */ | |
517 | return NULL; | |
518 | ||
519 | gdb_assert (varobj_value_is_changeable_p (var)); | |
520 | gdb_assert (!value_lazy (var->value)); | |
521 | ||
522 | /* If the specified format is the current one, | |
523 | we can reuse print_value. */ | |
524 | if (format == var->format) | |
525 | return xstrdup (var->print_value); | |
526 | else | |
527 | return varobj_value_get_print_value (var->value, format, var); | |
528 | } | |
529 | } | |
530 | } | |
531 | } | |
532 | \f | |
533 | ||
534 | /* varobj operations for c. */ | |
535 | ||
536 | const struct lang_varobj_ops c_varobj_ops = | |
537 | { | |
538 | c_number_of_children, | |
539 | c_name_of_variable, | |
540 | c_name_of_child, | |
541 | c_path_expr_of_child, | |
542 | c_value_of_child, | |
543 | c_type_of_child, | |
544 | c_value_of_variable, | |
545 | varobj_default_value_is_changeable_p, | |
9a9a7608 AB |
546 | NULL, /* value_has_mutated */ |
547 | c_is_path_expr_parent /* is_path_expr_parent */ | |
99ad9427 YQ |
548 | }; |
549 | ||
550 | /* A little convenience enum for dealing with C++/Java. */ | |
551 | enum vsections | |
552 | { | |
553 | v_public = 0, v_private, v_protected | |
554 | }; | |
555 | ||
556 | /* C++ */ | |
557 | ||
558 | static int | |
559 | cplus_number_of_children (struct varobj *var) | |
560 | { | |
561 | struct value *value = NULL; | |
562 | struct type *type; | |
563 | int children, dont_know; | |
564 | int lookup_actual_type = 0; | |
565 | struct value_print_options opts; | |
566 | ||
567 | dont_know = 1; | |
568 | children = 0; | |
569 | ||
570 | get_user_print_options (&opts); | |
571 | ||
572 | if (!CPLUS_FAKE_CHILD (var)) | |
573 | { | |
574 | type = varobj_get_value_type (var); | |
575 | ||
576 | /* It is necessary to access a real type (via RTTI). */ | |
577 | if (opts.objectprint) | |
578 | { | |
579 | value = var->value; | |
580 | lookup_actual_type = (TYPE_CODE (var->type) == TYPE_CODE_REF | |
581 | || TYPE_CODE (var->type) == TYPE_CODE_PTR); | |
582 | } | |
583 | adjust_value_for_child_access (&value, &type, NULL, lookup_actual_type); | |
584 | ||
0c6faab5 YQ |
585 | if (((TYPE_CODE (type)) == TYPE_CODE_STRUCT) |
586 | || ((TYPE_CODE (type)) == TYPE_CODE_UNION)) | |
99ad9427 YQ |
587 | { |
588 | int kids[3]; | |
589 | ||
590 | cplus_class_num_children (type, kids); | |
591 | if (kids[v_public] != 0) | |
592 | children++; | |
593 | if (kids[v_private] != 0) | |
594 | children++; | |
595 | if (kids[v_protected] != 0) | |
596 | children++; | |
597 | ||
598 | /* Add any baseclasses. */ | |
599 | children += TYPE_N_BASECLASSES (type); | |
600 | dont_know = 0; | |
601 | ||
602 | /* FIXME: save children in var. */ | |
603 | } | |
604 | } | |
605 | else | |
606 | { | |
607 | int kids[3]; | |
608 | ||
609 | type = varobj_get_value_type (var->parent); | |
610 | ||
611 | /* It is necessary to access a real type (via RTTI). */ | |
612 | if (opts.objectprint) | |
613 | { | |
614 | struct varobj *parent = var->parent; | |
615 | ||
616 | value = parent->value; | |
617 | lookup_actual_type = (TYPE_CODE (parent->type) == TYPE_CODE_REF | |
618 | || TYPE_CODE (parent->type) == TYPE_CODE_PTR); | |
619 | } | |
620 | adjust_value_for_child_access (&value, &type, NULL, lookup_actual_type); | |
621 | ||
622 | cplus_class_num_children (type, kids); | |
623 | if (strcmp (var->name, "public") == 0) | |
624 | children = kids[v_public]; | |
625 | else if (strcmp (var->name, "private") == 0) | |
626 | children = kids[v_private]; | |
627 | else | |
628 | children = kids[v_protected]; | |
629 | dont_know = 0; | |
630 | } | |
631 | ||
632 | if (dont_know) | |
633 | children = c_number_of_children (var); | |
634 | ||
635 | return children; | |
636 | } | |
637 | ||
638 | /* Compute # of public, private, and protected variables in this class. | |
639 | That means we need to descend into all baseclasses and find out | |
640 | how many are there, too. */ | |
641 | ||
642 | static void | |
643 | cplus_class_num_children (struct type *type, int children[3]) | |
644 | { | |
645 | int i, vptr_fieldno; | |
646 | struct type *basetype = NULL; | |
647 | ||
648 | children[v_public] = 0; | |
649 | children[v_private] = 0; | |
650 | children[v_protected] = 0; | |
651 | ||
652 | vptr_fieldno = get_vptr_fieldno (type, &basetype); | |
653 | for (i = TYPE_N_BASECLASSES (type); i < TYPE_NFIELDS (type); i++) | |
654 | { | |
655 | /* If we have a virtual table pointer, omit it. Even if virtual | |
656 | table pointers are not specifically marked in the debug info, | |
657 | they should be artificial. */ | |
658 | if ((type == basetype && i == vptr_fieldno) | |
659 | || TYPE_FIELD_ARTIFICIAL (type, i)) | |
660 | continue; | |
661 | ||
662 | if (TYPE_FIELD_PROTECTED (type, i)) | |
663 | children[v_protected]++; | |
664 | else if (TYPE_FIELD_PRIVATE (type, i)) | |
665 | children[v_private]++; | |
666 | else | |
667 | children[v_public]++; | |
668 | } | |
669 | } | |
670 | ||
671 | static char * | |
672 | cplus_name_of_variable (struct varobj *parent) | |
673 | { | |
674 | return c_name_of_variable (parent); | |
675 | } | |
676 | ||
677 | enum accessibility { private_field, protected_field, public_field }; | |
678 | ||
679 | /* Check if field INDEX of TYPE has the specified accessibility. | |
680 | Return 0 if so and 1 otherwise. */ | |
681 | ||
682 | static int | |
683 | match_accessibility (struct type *type, int index, enum accessibility acc) | |
684 | { | |
685 | if (acc == private_field && TYPE_FIELD_PRIVATE (type, index)) | |
686 | return 1; | |
687 | else if (acc == protected_field && TYPE_FIELD_PROTECTED (type, index)) | |
688 | return 1; | |
689 | else if (acc == public_field && !TYPE_FIELD_PRIVATE (type, index) | |
690 | && !TYPE_FIELD_PROTECTED (type, index)) | |
691 | return 1; | |
692 | else | |
693 | return 0; | |
694 | } | |
695 | ||
696 | static void | |
697 | cplus_describe_child (struct varobj *parent, int index, | |
698 | char **cname, struct value **cvalue, struct type **ctype, | |
699 | char **cfull_expression) | |
700 | { | |
701 | struct value *value; | |
702 | struct type *type; | |
703 | int was_ptr; | |
704 | int lookup_actual_type = 0; | |
705 | char *parent_expression = NULL; | |
706 | struct varobj *var; | |
707 | struct value_print_options opts; | |
708 | ||
709 | if (cname) | |
710 | *cname = NULL; | |
711 | if (cvalue) | |
712 | *cvalue = NULL; | |
713 | if (ctype) | |
714 | *ctype = NULL; | |
715 | if (cfull_expression) | |
716 | *cfull_expression = NULL; | |
717 | ||
718 | get_user_print_options (&opts); | |
719 | ||
720 | var = (CPLUS_FAKE_CHILD (parent)) ? parent->parent : parent; | |
721 | if (opts.objectprint) | |
722 | lookup_actual_type = (TYPE_CODE (var->type) == TYPE_CODE_REF | |
723 | || TYPE_CODE (var->type) == TYPE_CODE_PTR); | |
724 | value = var->value; | |
725 | type = varobj_get_value_type (var); | |
726 | if (cfull_expression) | |
727 | parent_expression | |
728 | = varobj_get_path_expr (varobj_get_path_expr_parent (var)); | |
729 | ||
730 | adjust_value_for_child_access (&value, &type, &was_ptr, lookup_actual_type); | |
731 | ||
732 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
733 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
734 | { | |
735 | char *join = was_ptr ? "->" : "."; | |
736 | ||
737 | if (CPLUS_FAKE_CHILD (parent)) | |
738 | { | |
739 | /* The fields of the class type are ordered as they | |
740 | appear in the class. We are given an index for a | |
741 | particular access control type ("public","protected", | |
742 | or "private"). We must skip over fields that don't | |
743 | have the access control we are looking for to properly | |
744 | find the indexed field. */ | |
745 | int type_index = TYPE_N_BASECLASSES (type); | |
746 | enum accessibility acc = public_field; | |
747 | int vptr_fieldno; | |
748 | struct type *basetype = NULL; | |
749 | const char *field_name; | |
750 | ||
751 | vptr_fieldno = get_vptr_fieldno (type, &basetype); | |
752 | if (strcmp (parent->name, "private") == 0) | |
753 | acc = private_field; | |
754 | else if (strcmp (parent->name, "protected") == 0) | |
755 | acc = protected_field; | |
756 | ||
757 | while (index >= 0) | |
758 | { | |
759 | if ((type == basetype && type_index == vptr_fieldno) | |
760 | || TYPE_FIELD_ARTIFICIAL (type, type_index)) | |
761 | ; /* ignore vptr */ | |
762 | else if (match_accessibility (type, type_index, acc)) | |
763 | --index; | |
764 | ++type_index; | |
765 | } | |
766 | --type_index; | |
767 | ||
768 | /* If the type is anonymous and the field has no name, | |
769 | set an appopriate name. */ | |
770 | field_name = TYPE_FIELD_NAME (type, type_index); | |
771 | if (field_name == NULL || *field_name == '\0') | |
772 | { | |
773 | if (cname) | |
774 | { | |
775 | if (TYPE_CODE (TYPE_FIELD_TYPE (type, type_index)) | |
776 | == TYPE_CODE_STRUCT) | |
777 | *cname = xstrdup (ANONYMOUS_STRUCT_NAME); | |
778 | else if (TYPE_CODE (TYPE_FIELD_TYPE (type, type_index)) | |
779 | == TYPE_CODE_UNION) | |
780 | *cname = xstrdup (ANONYMOUS_UNION_NAME); | |
781 | } | |
782 | ||
783 | if (cfull_expression) | |
784 | *cfull_expression = xstrdup (""); | |
785 | } | |
786 | else | |
787 | { | |
788 | if (cname) | |
789 | *cname = xstrdup (TYPE_FIELD_NAME (type, type_index)); | |
790 | ||
791 | if (cfull_expression) | |
792 | *cfull_expression | |
793 | = xstrprintf ("((%s)%s%s)", parent_expression, join, | |
794 | field_name); | |
795 | } | |
796 | ||
797 | if (cvalue && value) | |
798 | *cvalue = value_struct_element_index (value, type_index); | |
799 | ||
800 | if (ctype) | |
801 | *ctype = TYPE_FIELD_TYPE (type, type_index); | |
802 | } | |
803 | else if (index < TYPE_N_BASECLASSES (type)) | |
804 | { | |
805 | /* This is a baseclass. */ | |
806 | if (cname) | |
807 | *cname = xstrdup (TYPE_FIELD_NAME (type, index)); | |
808 | ||
809 | if (cvalue && value) | |
810 | *cvalue = value_cast (TYPE_FIELD_TYPE (type, index), value); | |
811 | ||
812 | if (ctype) | |
813 | { | |
814 | *ctype = TYPE_FIELD_TYPE (type, index); | |
815 | } | |
816 | ||
817 | if (cfull_expression) | |
818 | { | |
819 | char *ptr = was_ptr ? "*" : ""; | |
820 | ||
821 | /* Cast the parent to the base' type. Note that in gdb, | |
822 | expression like | |
823 | (Base1)d | |
824 | will create an lvalue, for all appearences, so we don't | |
825 | need to use more fancy: | |
826 | *(Base1*)(&d) | |
827 | construct. | |
828 | ||
829 | When we are in the scope of the base class or of one | |
830 | of its children, the type field name will be interpreted | |
831 | as a constructor, if it exists. Therefore, we must | |
832 | indicate that the name is a class name by using the | |
833 | 'class' keyword. See PR mi/11912 */ | |
834 | *cfull_expression = xstrprintf ("(%s(class %s%s) %s)", | |
835 | ptr, | |
836 | TYPE_FIELD_NAME (type, index), | |
837 | ptr, | |
838 | parent_expression); | |
839 | } | |
840 | } | |
841 | else | |
842 | { | |
843 | char *access = NULL; | |
844 | int children[3]; | |
845 | ||
846 | cplus_class_num_children (type, children); | |
847 | ||
848 | /* Everything beyond the baseclasses can | |
849 | only be "public", "private", or "protected" | |
850 | ||
851 | The special "fake" children are always output by varobj in | |
852 | this order. So if INDEX == 2, it MUST be "protected". */ | |
853 | index -= TYPE_N_BASECLASSES (type); | |
854 | switch (index) | |
855 | { | |
856 | case 0: | |
857 | if (children[v_public] > 0) | |
858 | access = "public"; | |
859 | else if (children[v_private] > 0) | |
860 | access = "private"; | |
861 | else | |
862 | access = "protected"; | |
863 | break; | |
864 | case 1: | |
865 | if (children[v_public] > 0) | |
866 | { | |
867 | if (children[v_private] > 0) | |
868 | access = "private"; | |
869 | else | |
870 | access = "protected"; | |
871 | } | |
872 | else if (children[v_private] > 0) | |
873 | access = "protected"; | |
874 | break; | |
875 | case 2: | |
876 | /* Must be protected. */ | |
877 | access = "protected"; | |
878 | break; | |
879 | default: | |
880 | /* error! */ | |
881 | break; | |
882 | } | |
883 | ||
884 | gdb_assert (access); | |
885 | if (cname) | |
886 | *cname = xstrdup (access); | |
887 | ||
888 | /* Value and type and full expression are null here. */ | |
889 | } | |
890 | } | |
891 | else | |
892 | { | |
893 | c_describe_child (parent, index, cname, cvalue, ctype, cfull_expression); | |
894 | } | |
895 | } | |
896 | ||
897 | static char * | |
898 | cplus_name_of_child (struct varobj *parent, int index) | |
899 | { | |
900 | char *name = NULL; | |
901 | ||
902 | cplus_describe_child (parent, index, &name, NULL, NULL, NULL); | |
903 | return name; | |
904 | } | |
905 | ||
906 | static char * | |
907 | cplus_path_expr_of_child (struct varobj *child) | |
908 | { | |
909 | cplus_describe_child (child->parent, child->index, NULL, NULL, NULL, | |
910 | &child->path_expr); | |
911 | return child->path_expr; | |
912 | } | |
913 | ||
914 | static struct value * | |
915 | cplus_value_of_child (struct varobj *parent, int index) | |
916 | { | |
917 | struct value *value = NULL; | |
918 | ||
919 | cplus_describe_child (parent, index, NULL, &value, NULL, NULL); | |
920 | return value; | |
921 | } | |
922 | ||
923 | static struct type * | |
924 | cplus_type_of_child (struct varobj *parent, int index) | |
925 | { | |
926 | struct type *type = NULL; | |
927 | ||
928 | cplus_describe_child (parent, index, NULL, NULL, &type, NULL); | |
929 | return type; | |
930 | } | |
931 | ||
932 | static char * | |
933 | cplus_value_of_variable (struct varobj *var, | |
934 | enum varobj_display_formats format) | |
935 | { | |
936 | ||
937 | /* If we have one of our special types, don't print out | |
938 | any value. */ | |
939 | if (CPLUS_FAKE_CHILD (var)) | |
940 | return xstrdup (""); | |
941 | ||
942 | return c_value_of_variable (var, format); | |
943 | } | |
944 | \f | |
945 | ||
946 | /* varobj operations for c++. */ | |
947 | ||
948 | const struct lang_varobj_ops cplus_varobj_ops = | |
949 | { | |
950 | cplus_number_of_children, | |
951 | cplus_name_of_variable, | |
952 | cplus_name_of_child, | |
953 | cplus_path_expr_of_child, | |
954 | cplus_value_of_child, | |
955 | cplus_type_of_child, | |
956 | cplus_value_of_variable, | |
957 | varobj_default_value_is_changeable_p, | |
9a9a7608 AB |
958 | NULL, /* value_has_mutated */ |
959 | c_is_path_expr_parent /* is_path_expr_parent */ | |
99ad9427 YQ |
960 | }; |
961 | ||
962 | \f |