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1 | /* Implementation of the GDB variable objects API. | |
2 | ||
3 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 | |
4 | Free Software Foundation, Inc. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
19 | Boston, MA 02110-1301, USA. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "exceptions.h" | |
23 | #include "value.h" | |
24 | #include "expression.h" | |
25 | #include "frame.h" | |
26 | #include "language.h" | |
27 | #include "wrapper.h" | |
28 | #include "gdbcmd.h" | |
29 | #include "block.h" | |
30 | ||
31 | #include "gdb_assert.h" | |
32 | #include "gdb_string.h" | |
33 | ||
34 | #include "varobj.h" | |
35 | #include "vec.h" | |
36 | ||
37 | /* Non-zero if we want to see trace of varobj level stuff. */ | |
38 | ||
39 | int varobjdebug = 0; | |
40 | static void | |
41 | show_varobjdebug (struct ui_file *file, int from_tty, | |
42 | struct cmd_list_element *c, const char *value) | |
43 | { | |
44 | fprintf_filtered (file, _("Varobj debugging is %s.\n"), value); | |
45 | } | |
46 | ||
47 | /* String representations of gdb's format codes */ | |
48 | char *varobj_format_string[] = | |
49 | { "natural", "binary", "decimal", "hexadecimal", "octal" }; | |
50 | ||
51 | /* String representations of gdb's known languages */ | |
52 | char *varobj_language_string[] = { "unknown", "C", "C++", "Java" }; | |
53 | ||
54 | /* Data structures */ | |
55 | ||
56 | /* Every root variable has one of these structures saved in its | |
57 | varobj. Members which must be free'd are noted. */ | |
58 | struct varobj_root | |
59 | { | |
60 | ||
61 | /* Alloc'd expression for this parent. */ | |
62 | struct expression *exp; | |
63 | ||
64 | /* Block for which this expression is valid */ | |
65 | struct block *valid_block; | |
66 | ||
67 | /* The frame for this expression */ | |
68 | struct frame_id frame; | |
69 | ||
70 | /* If 1, "update" always recomputes the frame & valid block | |
71 | using the currently selected frame. */ | |
72 | int use_selected_frame; | |
73 | ||
74 | /* Language info for this variable and its children */ | |
75 | struct language_specific *lang; | |
76 | ||
77 | /* The varobj for this root node. */ | |
78 | struct varobj *rootvar; | |
79 | ||
80 | /* Next root variable */ | |
81 | struct varobj_root *next; | |
82 | }; | |
83 | ||
84 | typedef struct varobj *varobj_p; | |
85 | ||
86 | DEF_VEC_P (varobj_p); | |
87 | ||
88 | /* Every variable in the system has a structure of this type defined | |
89 | for it. This structure holds all information necessary to manipulate | |
90 | a particular object variable. Members which must be freed are noted. */ | |
91 | struct varobj | |
92 | { | |
93 | ||
94 | /* Alloc'd name of the variable for this object.. If this variable is a | |
95 | child, then this name will be the child's source name. | |
96 | (bar, not foo.bar) */ | |
97 | /* NOTE: This is the "expression" */ | |
98 | char *name; | |
99 | ||
100 | /* The alloc'd name for this variable's object. This is here for | |
101 | convenience when constructing this object's children. */ | |
102 | char *obj_name; | |
103 | ||
104 | /* Index of this variable in its parent or -1 */ | |
105 | int index; | |
106 | ||
107 | /* The type of this variable. This may NEVER be NULL. */ | |
108 | struct type *type; | |
109 | ||
110 | /* The value of this expression or subexpression. This may be NULL. | |
111 | Invariant: if varobj_value_is_changeable_p (this) is non-zero, | |
112 | the value is either NULL, or not lazy. */ | |
113 | struct value *value; | |
114 | ||
115 | /* Did an error occur evaluating the expression or getting its value? */ | |
116 | int error; | |
117 | ||
118 | /* The number of (immediate) children this variable has */ | |
119 | int num_children; | |
120 | ||
121 | /* If this object is a child, this points to its immediate parent. */ | |
122 | struct varobj *parent; | |
123 | ||
124 | /* Children of this object. */ | |
125 | VEC (varobj_p) *children; | |
126 | ||
127 | /* Description of the root variable. Points to root variable for children. */ | |
128 | struct varobj_root *root; | |
129 | ||
130 | /* The format of the output for this object */ | |
131 | enum varobj_display_formats format; | |
132 | ||
133 | /* Was this variable updated via a varobj_set_value operation */ | |
134 | int updated; | |
135 | ||
136 | /* Last print value. */ | |
137 | char *print_value; | |
138 | }; | |
139 | ||
140 | struct cpstack | |
141 | { | |
142 | char *name; | |
143 | struct cpstack *next; | |
144 | }; | |
145 | ||
146 | /* A list of varobjs */ | |
147 | ||
148 | struct vlist | |
149 | { | |
150 | struct varobj *var; | |
151 | struct vlist *next; | |
152 | }; | |
153 | ||
154 | /* Private function prototypes */ | |
155 | ||
156 | /* Helper functions for the above subcommands. */ | |
157 | ||
158 | static int delete_variable (struct cpstack **, struct varobj *, int); | |
159 | ||
160 | static void delete_variable_1 (struct cpstack **, int *, | |
161 | struct varobj *, int, int); | |
162 | ||
163 | static int install_variable (struct varobj *); | |
164 | ||
165 | static void uninstall_variable (struct varobj *); | |
166 | ||
167 | static struct varobj *create_child (struct varobj *, int, char *); | |
168 | ||
169 | /* Utility routines */ | |
170 | ||
171 | static struct varobj *new_variable (void); | |
172 | ||
173 | static struct varobj *new_root_variable (void); | |
174 | ||
175 | static void free_variable (struct varobj *var); | |
176 | ||
177 | static struct cleanup *make_cleanup_free_variable (struct varobj *var); | |
178 | ||
179 | static struct type *get_type (struct varobj *var); | |
180 | ||
181 | static struct type *get_type_deref (struct varobj *var); | |
182 | ||
183 | static struct type *get_target_type (struct type *); | |
184 | ||
185 | static enum varobj_display_formats variable_default_display (struct varobj *); | |
186 | ||
187 | static void cppush (struct cpstack **pstack, char *name); | |
188 | ||
189 | static char *cppop (struct cpstack **pstack); | |
190 | ||
191 | static int install_new_value (struct varobj *var, struct value *value, | |
192 | int initial); | |
193 | ||
194 | /* Language-specific routines. */ | |
195 | ||
196 | static enum varobj_languages variable_language (struct varobj *var); | |
197 | ||
198 | static int number_of_children (struct varobj *); | |
199 | ||
200 | static char *name_of_variable (struct varobj *); | |
201 | ||
202 | static char *name_of_child (struct varobj *, int); | |
203 | ||
204 | static struct value *value_of_root (struct varobj **var_handle, int *); | |
205 | ||
206 | static struct value *value_of_child (struct varobj *parent, int index); | |
207 | ||
208 | static int variable_editable (struct varobj *var); | |
209 | ||
210 | static char *my_value_of_variable (struct varobj *var); | |
211 | ||
212 | static char *value_get_print_value (struct value *value, | |
213 | enum varobj_display_formats format); | |
214 | ||
215 | static int varobj_value_is_changeable_p (struct varobj *var); | |
216 | ||
217 | static int is_root_p (struct varobj *var); | |
218 | ||
219 | /* C implementation */ | |
220 | ||
221 | static int c_number_of_children (struct varobj *var); | |
222 | ||
223 | static char *c_name_of_variable (struct varobj *parent); | |
224 | ||
225 | static char *c_name_of_child (struct varobj *parent, int index); | |
226 | ||
227 | static struct value *c_value_of_root (struct varobj **var_handle); | |
228 | ||
229 | static struct value *c_value_of_child (struct varobj *parent, int index); | |
230 | ||
231 | static struct type *c_type_of_child (struct varobj *parent, int index); | |
232 | ||
233 | static int c_variable_editable (struct varobj *var); | |
234 | ||
235 | static char *c_value_of_variable (struct varobj *var); | |
236 | ||
237 | /* C++ implementation */ | |
238 | ||
239 | static int cplus_number_of_children (struct varobj *var); | |
240 | ||
241 | static void cplus_class_num_children (struct type *type, int children[3]); | |
242 | ||
243 | static char *cplus_name_of_variable (struct varobj *parent); | |
244 | ||
245 | static char *cplus_name_of_child (struct varobj *parent, int index); | |
246 | ||
247 | static struct value *cplus_value_of_root (struct varobj **var_handle); | |
248 | ||
249 | static struct value *cplus_value_of_child (struct varobj *parent, int index); | |
250 | ||
251 | static struct type *cplus_type_of_child (struct varobj *parent, int index); | |
252 | ||
253 | static int cplus_variable_editable (struct varobj *var); | |
254 | ||
255 | static char *cplus_value_of_variable (struct varobj *var); | |
256 | ||
257 | /* Java implementation */ | |
258 | ||
259 | static int java_number_of_children (struct varobj *var); | |
260 | ||
261 | static char *java_name_of_variable (struct varobj *parent); | |
262 | ||
263 | static char *java_name_of_child (struct varobj *parent, int index); | |
264 | ||
265 | static struct value *java_value_of_root (struct varobj **var_handle); | |
266 | ||
267 | static struct value *java_value_of_child (struct varobj *parent, int index); | |
268 | ||
269 | static struct type *java_type_of_child (struct varobj *parent, int index); | |
270 | ||
271 | static int java_variable_editable (struct varobj *var); | |
272 | ||
273 | static char *java_value_of_variable (struct varobj *var); | |
274 | ||
275 | /* The language specific vector */ | |
276 | ||
277 | struct language_specific | |
278 | { | |
279 | ||
280 | /* The language of this variable */ | |
281 | enum varobj_languages language; | |
282 | ||
283 | /* The number of children of PARENT. */ | |
284 | int (*number_of_children) (struct varobj * parent); | |
285 | ||
286 | /* The name (expression) of a root varobj. */ | |
287 | char *(*name_of_variable) (struct varobj * parent); | |
288 | ||
289 | /* The name of the INDEX'th child of PARENT. */ | |
290 | char *(*name_of_child) (struct varobj * parent, int index); | |
291 | ||
292 | /* The ``struct value *'' of the root variable ROOT. */ | |
293 | struct value *(*value_of_root) (struct varobj ** root_handle); | |
294 | ||
295 | /* The ``struct value *'' of the INDEX'th child of PARENT. */ | |
296 | struct value *(*value_of_child) (struct varobj * parent, int index); | |
297 | ||
298 | /* The type of the INDEX'th child of PARENT. */ | |
299 | struct type *(*type_of_child) (struct varobj * parent, int index); | |
300 | ||
301 | /* Is VAR editable? */ | |
302 | int (*variable_editable) (struct varobj * var); | |
303 | ||
304 | /* The current value of VAR. */ | |
305 | char *(*value_of_variable) (struct varobj * var); | |
306 | }; | |
307 | ||
308 | /* Array of known source language routines. */ | |
309 | static struct language_specific languages[vlang_end] = { | |
310 | /* Unknown (try treating as C */ | |
311 | { | |
312 | vlang_unknown, | |
313 | c_number_of_children, | |
314 | c_name_of_variable, | |
315 | c_name_of_child, | |
316 | c_value_of_root, | |
317 | c_value_of_child, | |
318 | c_type_of_child, | |
319 | c_variable_editable, | |
320 | c_value_of_variable} | |
321 | , | |
322 | /* C */ | |
323 | { | |
324 | vlang_c, | |
325 | c_number_of_children, | |
326 | c_name_of_variable, | |
327 | c_name_of_child, | |
328 | c_value_of_root, | |
329 | c_value_of_child, | |
330 | c_type_of_child, | |
331 | c_variable_editable, | |
332 | c_value_of_variable} | |
333 | , | |
334 | /* C++ */ | |
335 | { | |
336 | vlang_cplus, | |
337 | cplus_number_of_children, | |
338 | cplus_name_of_variable, | |
339 | cplus_name_of_child, | |
340 | cplus_value_of_root, | |
341 | cplus_value_of_child, | |
342 | cplus_type_of_child, | |
343 | cplus_variable_editable, | |
344 | cplus_value_of_variable} | |
345 | , | |
346 | /* Java */ | |
347 | { | |
348 | vlang_java, | |
349 | java_number_of_children, | |
350 | java_name_of_variable, | |
351 | java_name_of_child, | |
352 | java_value_of_root, | |
353 | java_value_of_child, | |
354 | java_type_of_child, | |
355 | java_variable_editable, | |
356 | java_value_of_variable} | |
357 | }; | |
358 | ||
359 | /* A little convenience enum for dealing with C++/Java */ | |
360 | enum vsections | |
361 | { | |
362 | v_public = 0, v_private, v_protected | |
363 | }; | |
364 | ||
365 | /* Private data */ | |
366 | ||
367 | /* Mappings of varobj_display_formats enums to gdb's format codes */ | |
368 | static int format_code[] = { 0, 't', 'd', 'x', 'o' }; | |
369 | ||
370 | /* Header of the list of root variable objects */ | |
371 | static struct varobj_root *rootlist; | |
372 | static int rootcount = 0; /* number of root varobjs in the list */ | |
373 | ||
374 | /* Prime number indicating the number of buckets in the hash table */ | |
375 | /* A prime large enough to avoid too many colisions */ | |
376 | #define VAROBJ_TABLE_SIZE 227 | |
377 | ||
378 | /* Pointer to the varobj hash table (built at run time) */ | |
379 | static struct vlist **varobj_table; | |
380 | ||
381 | /* Is the variable X one of our "fake" children? */ | |
382 | #define CPLUS_FAKE_CHILD(x) \ | |
383 | ((x) != NULL && (x)->type == NULL && (x)->value == NULL) | |
384 | \f | |
385 | ||
386 | /* API Implementation */ | |
387 | static int | |
388 | is_root_p (struct varobj *var) | |
389 | { | |
390 | return (var->root->rootvar == var); | |
391 | } | |
392 | ||
393 | /* Creates a varobj (not its children) */ | |
394 | ||
395 | /* Return the full FRAME which corresponds to the given CORE_ADDR | |
396 | or NULL if no FRAME on the chain corresponds to CORE_ADDR. */ | |
397 | ||
398 | static struct frame_info * | |
399 | find_frame_addr_in_frame_chain (CORE_ADDR frame_addr) | |
400 | { | |
401 | struct frame_info *frame = NULL; | |
402 | ||
403 | if (frame_addr == (CORE_ADDR) 0) | |
404 | return NULL; | |
405 | ||
406 | while (1) | |
407 | { | |
408 | frame = get_prev_frame (frame); | |
409 | if (frame == NULL) | |
410 | return NULL; | |
411 | if (get_frame_base_address (frame) == frame_addr) | |
412 | return frame; | |
413 | } | |
414 | } | |
415 | ||
416 | struct varobj * | |
417 | varobj_create (char *objname, | |
418 | char *expression, CORE_ADDR frame, enum varobj_type type) | |
419 | { | |
420 | struct varobj *var; | |
421 | struct frame_info *fi; | |
422 | struct frame_info *old_fi = NULL; | |
423 | struct block *block; | |
424 | struct cleanup *old_chain; | |
425 | ||
426 | /* Fill out a varobj structure for the (root) variable being constructed. */ | |
427 | var = new_root_variable (); | |
428 | old_chain = make_cleanup_free_variable (var); | |
429 | ||
430 | if (expression != NULL) | |
431 | { | |
432 | char *p; | |
433 | enum varobj_languages lang; | |
434 | struct value *value; | |
435 | ||
436 | /* Parse and evaluate the expression, filling in as much | |
437 | of the variable's data as possible */ | |
438 | ||
439 | /* Allow creator to specify context of variable */ | |
440 | if ((type == USE_CURRENT_FRAME) || (type == USE_SELECTED_FRAME)) | |
441 | fi = deprecated_selected_frame; | |
442 | else | |
443 | /* FIXME: cagney/2002-11-23: This code should be doing a | |
444 | lookup using the frame ID and not just the frame's | |
445 | ``address''. This, of course, means an interface change. | |
446 | However, with out that interface change ISAs, such as the | |
447 | ia64 with its two stacks, won't work. Similar goes for the | |
448 | case where there is a frameless function. */ | |
449 | fi = find_frame_addr_in_frame_chain (frame); | |
450 | ||
451 | /* frame = -2 means always use selected frame */ | |
452 | if (type == USE_SELECTED_FRAME) | |
453 | var->root->use_selected_frame = 1; | |
454 | ||
455 | block = NULL; | |
456 | if (fi != NULL) | |
457 | block = get_frame_block (fi, 0); | |
458 | ||
459 | p = expression; | |
460 | innermost_block = NULL; | |
461 | /* Wrap the call to parse expression, so we can | |
462 | return a sensible error. */ | |
463 | if (!gdb_parse_exp_1 (&p, block, 0, &var->root->exp)) | |
464 | { | |
465 | return NULL; | |
466 | } | |
467 | ||
468 | /* Don't allow variables to be created for types. */ | |
469 | if (var->root->exp->elts[0].opcode == OP_TYPE) | |
470 | { | |
471 | do_cleanups (old_chain); | |
472 | fprintf_unfiltered (gdb_stderr, "Attempt to use a type name" | |
473 | " as an expression.\n"); | |
474 | return NULL; | |
475 | } | |
476 | ||
477 | var->format = variable_default_display (var); | |
478 | var->root->valid_block = innermost_block; | |
479 | var->name = savestring (expression, strlen (expression)); | |
480 | ||
481 | /* When the frame is different from the current frame, | |
482 | we must select the appropriate frame before parsing | |
483 | the expression, otherwise the value will not be current. | |
484 | Since select_frame is so benign, just call it for all cases. */ | |
485 | if (fi != NULL) | |
486 | { | |
487 | var->root->frame = get_frame_id (fi); | |
488 | old_fi = deprecated_selected_frame; | |
489 | select_frame (fi); | |
490 | } | |
491 | ||
492 | /* We definitively need to catch errors here. | |
493 | If evaluate_expression succeeds we got the value we wanted. | |
494 | But if it fails, we still go on with a call to evaluate_type() */ | |
495 | if (!gdb_evaluate_expression (var->root->exp, &value)) | |
496 | /* Error getting the value. Try to at least get the | |
497 | right type. */ | |
498 | value = evaluate_type (var->root->exp); | |
499 | ||
500 | var->type = value_type (value); | |
501 | install_new_value (var, value, 1 /* Initial assignment */); | |
502 | ||
503 | /* Set language info */ | |
504 | lang = variable_language (var); | |
505 | var->root->lang = &languages[lang]; | |
506 | ||
507 | /* Set ourselves as our root */ | |
508 | var->root->rootvar = var; | |
509 | ||
510 | /* Reset the selected frame */ | |
511 | if (fi != NULL) | |
512 | select_frame (old_fi); | |
513 | } | |
514 | ||
515 | /* If the variable object name is null, that means this | |
516 | is a temporary variable, so don't install it. */ | |
517 | ||
518 | if ((var != NULL) && (objname != NULL)) | |
519 | { | |
520 | var->obj_name = savestring (objname, strlen (objname)); | |
521 | ||
522 | /* If a varobj name is duplicated, the install will fail so | |
523 | we must clenup */ | |
524 | if (!install_variable (var)) | |
525 | { | |
526 | do_cleanups (old_chain); | |
527 | return NULL; | |
528 | } | |
529 | } | |
530 | ||
531 | discard_cleanups (old_chain); | |
532 | return var; | |
533 | } | |
534 | ||
535 | /* Generates an unique name that can be used for a varobj */ | |
536 | ||
537 | char * | |
538 | varobj_gen_name (void) | |
539 | { | |
540 | static int id = 0; | |
541 | char *obj_name; | |
542 | ||
543 | /* generate a name for this object */ | |
544 | id++; | |
545 | obj_name = xstrprintf ("var%d", id); | |
546 | ||
547 | return obj_name; | |
548 | } | |
549 | ||
550 | /* Given an "objname", returns the pointer to the corresponding varobj | |
551 | or NULL if not found */ | |
552 | ||
553 | struct varobj * | |
554 | varobj_get_handle (char *objname) | |
555 | { | |
556 | struct vlist *cv; | |
557 | const char *chp; | |
558 | unsigned int index = 0; | |
559 | unsigned int i = 1; | |
560 | ||
561 | for (chp = objname; *chp; chp++) | |
562 | { | |
563 | index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; | |
564 | } | |
565 | ||
566 | cv = *(varobj_table + index); | |
567 | while ((cv != NULL) && (strcmp (cv->var->obj_name, objname) != 0)) | |
568 | cv = cv->next; | |
569 | ||
570 | if (cv == NULL) | |
571 | error (_("Variable object not found")); | |
572 | ||
573 | return cv->var; | |
574 | } | |
575 | ||
576 | /* Given the handle, return the name of the object */ | |
577 | ||
578 | char * | |
579 | varobj_get_objname (struct varobj *var) | |
580 | { | |
581 | return var->obj_name; | |
582 | } | |
583 | ||
584 | /* Given the handle, return the expression represented by the object */ | |
585 | ||
586 | char * | |
587 | varobj_get_expression (struct varobj *var) | |
588 | { | |
589 | return name_of_variable (var); | |
590 | } | |
591 | ||
592 | /* Deletes a varobj and all its children if only_children == 0, | |
593 | otherwise deletes only the children; returns a malloc'ed list of all the | |
594 | (malloc'ed) names of the variables that have been deleted (NULL terminated) */ | |
595 | ||
596 | int | |
597 | varobj_delete (struct varobj *var, char ***dellist, int only_children) | |
598 | { | |
599 | int delcount; | |
600 | int mycount; | |
601 | struct cpstack *result = NULL; | |
602 | char **cp; | |
603 | ||
604 | /* Initialize a stack for temporary results */ | |
605 | cppush (&result, NULL); | |
606 | ||
607 | if (only_children) | |
608 | /* Delete only the variable children */ | |
609 | delcount = delete_variable (&result, var, 1 /* only the children */ ); | |
610 | else | |
611 | /* Delete the variable and all its children */ | |
612 | delcount = delete_variable (&result, var, 0 /* parent+children */ ); | |
613 | ||
614 | /* We may have been asked to return a list of what has been deleted */ | |
615 | if (dellist != NULL) | |
616 | { | |
617 | *dellist = xmalloc ((delcount + 1) * sizeof (char *)); | |
618 | ||
619 | cp = *dellist; | |
620 | mycount = delcount; | |
621 | *cp = cppop (&result); | |
622 | while ((*cp != NULL) && (mycount > 0)) | |
623 | { | |
624 | mycount--; | |
625 | cp++; | |
626 | *cp = cppop (&result); | |
627 | } | |
628 | ||
629 | if (mycount || (*cp != NULL)) | |
630 | warning (_("varobj_delete: assertion failed - mycount(=%d) <> 0"), | |
631 | mycount); | |
632 | } | |
633 | ||
634 | return delcount; | |
635 | } | |
636 | ||
637 | /* Set/Get variable object display format */ | |
638 | ||
639 | enum varobj_display_formats | |
640 | varobj_set_display_format (struct varobj *var, | |
641 | enum varobj_display_formats format) | |
642 | { | |
643 | switch (format) | |
644 | { | |
645 | case FORMAT_NATURAL: | |
646 | case FORMAT_BINARY: | |
647 | case FORMAT_DECIMAL: | |
648 | case FORMAT_HEXADECIMAL: | |
649 | case FORMAT_OCTAL: | |
650 | var->format = format; | |
651 | break; | |
652 | ||
653 | default: | |
654 | var->format = variable_default_display (var); | |
655 | } | |
656 | ||
657 | return var->format; | |
658 | } | |
659 | ||
660 | enum varobj_display_formats | |
661 | varobj_get_display_format (struct varobj *var) | |
662 | { | |
663 | return var->format; | |
664 | } | |
665 | ||
666 | int | |
667 | varobj_get_num_children (struct varobj *var) | |
668 | { | |
669 | if (var->num_children == -1) | |
670 | var->num_children = number_of_children (var); | |
671 | ||
672 | return var->num_children; | |
673 | } | |
674 | ||
675 | /* Creates a list of the immediate children of a variable object; | |
676 | the return code is the number of such children or -1 on error */ | |
677 | ||
678 | int | |
679 | varobj_list_children (struct varobj *var, struct varobj ***childlist) | |
680 | { | |
681 | struct varobj *child; | |
682 | char *name; | |
683 | int i; | |
684 | ||
685 | /* sanity check: have we been passed a pointer? */ | |
686 | if (childlist == NULL) | |
687 | return -1; | |
688 | ||
689 | *childlist = NULL; | |
690 | ||
691 | if (var->num_children == -1) | |
692 | var->num_children = number_of_children (var); | |
693 | ||
694 | /* If that failed, give up. */ | |
695 | if (var->num_children == -1) | |
696 | return -1; | |
697 | ||
698 | /* If we're called when the list of children is not yet initialized, | |
699 | allocate enough elements in it. */ | |
700 | while (VEC_length (varobj_p, var->children) < var->num_children) | |
701 | VEC_safe_push (varobj_p, var->children, NULL); | |
702 | ||
703 | /* List of children */ | |
704 | *childlist = xmalloc ((var->num_children + 1) * sizeof (struct varobj *)); | |
705 | ||
706 | for (i = 0; i < var->num_children; i++) | |
707 | { | |
708 | varobj_p existing; | |
709 | ||
710 | /* Mark as the end in case we bail out */ | |
711 | *((*childlist) + i) = NULL; | |
712 | ||
713 | existing = VEC_index (varobj_p, var->children, i); | |
714 | ||
715 | if (existing == NULL) | |
716 | { | |
717 | /* Either it's the first call to varobj_list_children for | |
718 | this variable object, and the child was never created, | |
719 | or it was explicitly deleted by the client. */ | |
720 | name = name_of_child (var, i); | |
721 | existing = create_child (var, i, name); | |
722 | VEC_replace (varobj_p, var->children, i, existing); | |
723 | } | |
724 | ||
725 | *((*childlist) + i) = existing; | |
726 | } | |
727 | ||
728 | /* End of list is marked by a NULL pointer */ | |
729 | *((*childlist) + i) = NULL; | |
730 | ||
731 | return var->num_children; | |
732 | } | |
733 | ||
734 | /* Obtain the type of an object Variable as a string similar to the one gdb | |
735 | prints on the console */ | |
736 | ||
737 | char * | |
738 | varobj_get_type (struct varobj *var) | |
739 | { | |
740 | struct value *val; | |
741 | struct cleanup *old_chain; | |
742 | struct ui_file *stb; | |
743 | char *thetype; | |
744 | long length; | |
745 | ||
746 | /* For the "fake" variables, do not return a type. (It's type is | |
747 | NULL, too.) */ | |
748 | if (CPLUS_FAKE_CHILD (var)) | |
749 | return NULL; | |
750 | ||
751 | stb = mem_fileopen (); | |
752 | old_chain = make_cleanup_ui_file_delete (stb); | |
753 | ||
754 | /* To print the type, we simply create a zero ``struct value *'' and | |
755 | cast it to our type. We then typeprint this variable. */ | |
756 | val = value_zero (var->type, not_lval); | |
757 | type_print (value_type (val), "", stb, -1); | |
758 | ||
759 | thetype = ui_file_xstrdup (stb, &length); | |
760 | do_cleanups (old_chain); | |
761 | return thetype; | |
762 | } | |
763 | ||
764 | /* Obtain the type of an object variable. */ | |
765 | ||
766 | struct type * | |
767 | varobj_get_gdb_type (struct varobj *var) | |
768 | { | |
769 | return var->type; | |
770 | } | |
771 | ||
772 | enum varobj_languages | |
773 | varobj_get_language (struct varobj *var) | |
774 | { | |
775 | return variable_language (var); | |
776 | } | |
777 | ||
778 | int | |
779 | varobj_get_attributes (struct varobj *var) | |
780 | { | |
781 | int attributes = 0; | |
782 | ||
783 | if (variable_editable (var)) | |
784 | /* FIXME: define masks for attributes */ | |
785 | attributes |= 0x00000001; /* Editable */ | |
786 | ||
787 | return attributes; | |
788 | } | |
789 | ||
790 | char * | |
791 | varobj_get_value (struct varobj *var) | |
792 | { | |
793 | return my_value_of_variable (var); | |
794 | } | |
795 | ||
796 | /* Set the value of an object variable (if it is editable) to the | |
797 | value of the given expression */ | |
798 | /* Note: Invokes functions that can call error() */ | |
799 | ||
800 | int | |
801 | varobj_set_value (struct varobj *var, char *expression) | |
802 | { | |
803 | struct value *val; | |
804 | int offset = 0; | |
805 | int error = 0; | |
806 | ||
807 | /* The argument "expression" contains the variable's new value. | |
808 | We need to first construct a legal expression for this -- ugh! */ | |
809 | /* Does this cover all the bases? */ | |
810 | struct expression *exp; | |
811 | struct value *value; | |
812 | int saved_input_radix = input_radix; | |
813 | ||
814 | if (var->value != NULL && variable_editable (var) && !var->error) | |
815 | { | |
816 | char *s = expression; | |
817 | int i; | |
818 | ||
819 | input_radix = 10; /* ALWAYS reset to decimal temporarily */ | |
820 | exp = parse_exp_1 (&s, 0, 0); | |
821 | if (!gdb_evaluate_expression (exp, &value)) | |
822 | { | |
823 | /* We cannot proceed without a valid expression. */ | |
824 | xfree (exp); | |
825 | return 0; | |
826 | } | |
827 | ||
828 | /* All types that are editable must also be changeable. */ | |
829 | gdb_assert (varobj_value_is_changeable_p (var)); | |
830 | ||
831 | /* The value of a changeable variable object must not be lazy. */ | |
832 | gdb_assert (!value_lazy (var->value)); | |
833 | ||
834 | /* Need to coerce the input. We want to check if the | |
835 | value of the variable object will be different | |
836 | after assignment, and the first thing value_assign | |
837 | does is coerce the input. | |
838 | For example, if we are assigning an array to a pointer variable we | |
839 | should compare the pointer with the the array's address, not with the | |
840 | array's content. */ | |
841 | value = coerce_array (value); | |
842 | ||
843 | /* The new value may be lazy. gdb_value_assign, or | |
844 | rather value_contents, will take care of this. | |
845 | If fetching of the new value will fail, gdb_value_assign | |
846 | with catch the exception. */ | |
847 | if (!gdb_value_assign (var->value, value, &val)) | |
848 | return 0; | |
849 | ||
850 | /* If the value has changed, record it, so that next -var-update can | |
851 | report this change. If a variable had a value of '1', we've set it | |
852 | to '333' and then set again to '1', when -var-update will report this | |
853 | variable as changed -- because the first assignment has set the | |
854 | 'updated' flag. There's no need to optimize that, because return value | |
855 | of -var-update should be considered an approximation. */ | |
856 | var->updated = install_new_value (var, val, 0 /* Compare values. */); | |
857 | input_radix = saved_input_radix; | |
858 | return 1; | |
859 | } | |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
864 | /* Returns a malloc'ed list with all root variable objects */ | |
865 | int | |
866 | varobj_list (struct varobj ***varlist) | |
867 | { | |
868 | struct varobj **cv; | |
869 | struct varobj_root *croot; | |
870 | int mycount = rootcount; | |
871 | ||
872 | /* Alloc (rootcount + 1) entries for the result */ | |
873 | *varlist = xmalloc ((rootcount + 1) * sizeof (struct varobj *)); | |
874 | ||
875 | cv = *varlist; | |
876 | croot = rootlist; | |
877 | while ((croot != NULL) && (mycount > 0)) | |
878 | { | |
879 | *cv = croot->rootvar; | |
880 | mycount--; | |
881 | cv++; | |
882 | croot = croot->next; | |
883 | } | |
884 | /* Mark the end of the list */ | |
885 | *cv = NULL; | |
886 | ||
887 | if (mycount || (croot != NULL)) | |
888 | warning | |
889 | ("varobj_list: assertion failed - wrong tally of root vars (%d:%d)", | |
890 | rootcount, mycount); | |
891 | ||
892 | return rootcount; | |
893 | } | |
894 | ||
895 | /* Assign a new value to a variable object. If INITIAL is non-zero, | |
896 | this is the first assignement after the variable object was just | |
897 | created, or changed type. In that case, just assign the value | |
898 | and return 0. | |
899 | Otherwise, assign the value and if type_changeable returns non-zero, | |
900 | find if the new value is different from the current value. | |
901 | Return 1 if so, and 0 if the values are equal. | |
902 | ||
903 | The VALUE parameter should not be released -- the function will | |
904 | take care of releasing it when needed. */ | |
905 | static int | |
906 | install_new_value (struct varobj *var, struct value *value, int initial) | |
907 | { | |
908 | int changeable; | |
909 | int need_to_fetch; | |
910 | int changed = 0; | |
911 | ||
912 | var->error = 0; | |
913 | /* We need to know the varobj's type to decide if the value should | |
914 | be fetched or not. C++ fake children (public/protected/private) don't have | |
915 | a type. */ | |
916 | gdb_assert (var->type || CPLUS_FAKE_CHILD (var)); | |
917 | changeable = varobj_value_is_changeable_p (var); | |
918 | need_to_fetch = changeable; | |
919 | ||
920 | /* We are not interested in the address of references, and given | |
921 | that in C++ a reference is not rebindable, it cannot | |
922 | meaningfully change. So, get hold of the real value. */ | |
923 | if (value) | |
924 | { | |
925 | value = coerce_ref (value); | |
926 | release_value (value); | |
927 | } | |
928 | ||
929 | if (var->type && TYPE_CODE (var->type) == TYPE_CODE_UNION) | |
930 | /* For unions, we need to fetch the value implicitly because | |
931 | of implementation of union member fetch. When gdb | |
932 | creates a value for a field and the value of the enclosing | |
933 | structure is not lazy, it immediately copies the necessary | |
934 | bytes from the enclosing values. If the enclosing value is | |
935 | lazy, the call to value_fetch_lazy on the field will read | |
936 | the data from memory. For unions, that means we'll read the | |
937 | same memory more than once, which is not desirable. So | |
938 | fetch now. */ | |
939 | need_to_fetch = 1; | |
940 | ||
941 | /* The new value might be lazy. If the type is changeable, | |
942 | that is we'll be comparing values of this type, fetch the | |
943 | value now. Otherwise, on the next update the old value | |
944 | will be lazy, which means we've lost that old value. */ | |
945 | if (need_to_fetch && value && value_lazy (value)) | |
946 | { | |
947 | if (!gdb_value_fetch_lazy (value)) | |
948 | { | |
949 | var->error = 1; | |
950 | /* Set the value to NULL, so that for the next -var-update, | |
951 | we don't try to compare the new value with this value, | |
952 | that we couldn't even read. */ | |
953 | value = NULL; | |
954 | } | |
955 | else | |
956 | var->error = 0; | |
957 | } | |
958 | ||
959 | /* If the type is changeable, compare the old and the new values. | |
960 | If this is the initial assignment, we don't have any old value | |
961 | to compare with. */ | |
962 | if (initial) | |
963 | var->print_value = value_get_print_value (value, var->format); | |
964 | else if (changeable) | |
965 | { | |
966 | /* If the value of the varobj was changed by -var-set-value, then the | |
967 | value in the varobj and in the target is the same. However, that value | |
968 | is different from the value that the varobj had after the previous | |
969 | -var-update. So need to the varobj as changed. */ | |
970 | if (var->updated) | |
971 | { | |
972 | xfree (var->print_value); | |
973 | var->print_value = value_get_print_value (value, var->format); | |
974 | changed = 1; | |
975 | } | |
976 | else | |
977 | { | |
978 | /* Try to compare the values. That requires that both | |
979 | values are non-lazy. */ | |
980 | ||
981 | /* Quick comparison of NULL values. */ | |
982 | if (var->value == NULL && value == NULL) | |
983 | /* Equal. */ | |
984 | ; | |
985 | else if (var->value == NULL || value == NULL) | |
986 | { | |
987 | xfree (var->print_value); | |
988 | var->print_value = value_get_print_value (value, var->format); | |
989 | changed = 1; | |
990 | } | |
991 | else | |
992 | { | |
993 | char *print_value; | |
994 | gdb_assert (!value_lazy (var->value)); | |
995 | gdb_assert (!value_lazy (value)); | |
996 | print_value = value_get_print_value (value, var->format); | |
997 | ||
998 | gdb_assert (var->print_value != NULL && print_value != NULL); | |
999 | if (strcmp (var->print_value, print_value) != 0) | |
1000 | { | |
1001 | xfree (var->print_value); | |
1002 | var->print_value = print_value; | |
1003 | changed = 1; | |
1004 | } | |
1005 | else | |
1006 | xfree (print_value); | |
1007 | } | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | /* We must always keep the new value, since children depend on it. */ | |
1012 | if (var->value != NULL) | |
1013 | value_free (var->value); | |
1014 | var->value = value; | |
1015 | var->updated = 0; | |
1016 | ||
1017 | gdb_assert (!var->value || value_type (var->value)); | |
1018 | ||
1019 | return changed; | |
1020 | } | |
1021 | ||
1022 | /* Update the values for a variable and its children. This is a | |
1023 | two-pronged attack. First, re-parse the value for the root's | |
1024 | expression to see if it's changed. Then go all the way | |
1025 | through its children, reconstructing them and noting if they've | |
1026 | changed. | |
1027 | Return value: | |
1028 | -1 if there was an error updating the varobj | |
1029 | -2 if the type changed | |
1030 | Otherwise it is the number of children + parent changed | |
1031 | ||
1032 | Only root variables can be updated... | |
1033 | ||
1034 | NOTE: This function may delete the caller's varobj. If it | |
1035 | returns -2, then it has done this and VARP will be modified | |
1036 | to point to the new varobj. */ | |
1037 | ||
1038 | int | |
1039 | varobj_update (struct varobj **varp, struct varobj ***changelist) | |
1040 | { | |
1041 | int changed = 0; | |
1042 | int error = 0; | |
1043 | int type_changed; | |
1044 | int i; | |
1045 | int vleft; | |
1046 | struct varobj *v; | |
1047 | struct varobj **cv; | |
1048 | struct varobj **templist = NULL; | |
1049 | struct value *new; | |
1050 | VEC (varobj_p) *stack = NULL; | |
1051 | VEC (varobj_p) *result = NULL; | |
1052 | struct frame_id old_fid; | |
1053 | struct frame_info *fi; | |
1054 | ||
1055 | /* sanity check: have we been passed a pointer? */ | |
1056 | if (changelist == NULL) | |
1057 | return -1; | |
1058 | ||
1059 | /* Only root variables can be updated... */ | |
1060 | if (!is_root_p (*varp)) | |
1061 | /* Not a root var */ | |
1062 | return -1; | |
1063 | ||
1064 | /* Save the selected stack frame, since we will need to change it | |
1065 | in order to evaluate expressions. */ | |
1066 | old_fid = get_frame_id (deprecated_selected_frame); | |
1067 | ||
1068 | /* Update the root variable. value_of_root can return NULL | |
1069 | if the variable is no longer around, i.e. we stepped out of | |
1070 | the frame in which a local existed. We are letting the | |
1071 | value_of_root variable dispose of the varobj if the type | |
1072 | has changed. */ | |
1073 | type_changed = 1; | |
1074 | new = value_of_root (varp, &type_changed); | |
1075 | ||
1076 | /* Restore selected frame */ | |
1077 | fi = frame_find_by_id (old_fid); | |
1078 | if (fi) | |
1079 | select_frame (fi); | |
1080 | ||
1081 | if (new == NULL) | |
1082 | { | |
1083 | (*varp)->error = 1; | |
1084 | return -1; | |
1085 | } | |
1086 | ||
1087 | /* If this is a "use_selected_frame" varobj, and its type has changed, | |
1088 | them note that it's changed. */ | |
1089 | if (type_changed) | |
1090 | VEC_safe_push (varobj_p, result, *varp); | |
1091 | ||
1092 | if (install_new_value ((*varp), new, type_changed)) | |
1093 | { | |
1094 | /* If type_changed is 1, install_new_value will never return | |
1095 | non-zero, so we'll never report the same variable twice. */ | |
1096 | gdb_assert (!type_changed); | |
1097 | VEC_safe_push (varobj_p, result, *varp); | |
1098 | } | |
1099 | ||
1100 | VEC_safe_push (varobj_p, stack, *varp); | |
1101 | ||
1102 | /* Walk through the children, reconstructing them all. */ | |
1103 | while (!VEC_empty (varobj_p, stack)) | |
1104 | { | |
1105 | v = VEC_pop (varobj_p, stack); | |
1106 | ||
1107 | /* Push any children. Use reverse order so that the first | |
1108 | child is popped from the work stack first, and so | |
1109 | will be added to result first. This does not | |
1110 | affect correctness, just "nicer". */ | |
1111 | for (i = VEC_length (varobj_p, v->children)-1; i >= 0; --i) | |
1112 | { | |
1113 | varobj_p c = VEC_index (varobj_p, v->children, i); | |
1114 | /* Child may be NULL if explicitly deleted by -var-delete. */ | |
1115 | if (c != NULL) | |
1116 | VEC_safe_push (varobj_p, stack, c); | |
1117 | } | |
1118 | ||
1119 | /* Update this variable, unless it's a root, which is already | |
1120 | updated. */ | |
1121 | if (v != *varp) | |
1122 | { | |
1123 | new = value_of_child (v->parent, v->index); | |
1124 | if (install_new_value (v, new, 0 /* type not changed */)) | |
1125 | { | |
1126 | /* Note that it's changed */ | |
1127 | VEC_safe_push (varobj_p, result, v); | |
1128 | v->updated = 0; | |
1129 | } | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | /* Alloc (changed + 1) list entries */ | |
1134 | changed = VEC_length (varobj_p, result); | |
1135 | *changelist = xmalloc ((changed + 1) * sizeof (struct varobj *)); | |
1136 | cv = *changelist; | |
1137 | ||
1138 | for (i = 0; i < changed; ++i) | |
1139 | { | |
1140 | *cv = VEC_index (varobj_p, result, i); | |
1141 | gdb_assert (*cv != NULL); | |
1142 | ++cv; | |
1143 | } | |
1144 | *cv = 0; | |
1145 | ||
1146 | if (type_changed) | |
1147 | return -2; | |
1148 | else | |
1149 | return changed; | |
1150 | } | |
1151 | \f | |
1152 | ||
1153 | /* Helper functions */ | |
1154 | ||
1155 | /* | |
1156 | * Variable object construction/destruction | |
1157 | */ | |
1158 | ||
1159 | static int | |
1160 | delete_variable (struct cpstack **resultp, struct varobj *var, | |
1161 | int only_children_p) | |
1162 | { | |
1163 | int delcount = 0; | |
1164 | ||
1165 | delete_variable_1 (resultp, &delcount, var, | |
1166 | only_children_p, 1 /* remove_from_parent_p */ ); | |
1167 | ||
1168 | return delcount; | |
1169 | } | |
1170 | ||
1171 | /* Delete the variable object VAR and its children */ | |
1172 | /* IMPORTANT NOTE: If we delete a variable which is a child | |
1173 | and the parent is not removed we dump core. It must be always | |
1174 | initially called with remove_from_parent_p set */ | |
1175 | static void | |
1176 | delete_variable_1 (struct cpstack **resultp, int *delcountp, | |
1177 | struct varobj *var, int only_children_p, | |
1178 | int remove_from_parent_p) | |
1179 | { | |
1180 | int i; | |
1181 | ||
1182 | /* Delete any children of this variable, too. */ | |
1183 | for (i = 0; i < VEC_length (varobj_p, var->children); ++i) | |
1184 | { | |
1185 | varobj_p child = VEC_index (varobj_p, var->children, i); | |
1186 | if (!remove_from_parent_p) | |
1187 | child->parent = NULL; | |
1188 | delete_variable_1 (resultp, delcountp, child, 0, only_children_p); | |
1189 | } | |
1190 | VEC_free (varobj_p, var->children); | |
1191 | ||
1192 | /* if we were called to delete only the children we are done here */ | |
1193 | if (only_children_p) | |
1194 | return; | |
1195 | ||
1196 | /* Otherwise, add it to the list of deleted ones and proceed to do so */ | |
1197 | /* If the name is null, this is a temporary variable, that has not | |
1198 | yet been installed, don't report it, it belongs to the caller... */ | |
1199 | if (var->obj_name != NULL) | |
1200 | { | |
1201 | cppush (resultp, xstrdup (var->obj_name)); | |
1202 | *delcountp = *delcountp + 1; | |
1203 | } | |
1204 | ||
1205 | /* If this variable has a parent, remove it from its parent's list */ | |
1206 | /* OPTIMIZATION: if the parent of this variable is also being deleted, | |
1207 | (as indicated by remove_from_parent_p) we don't bother doing an | |
1208 | expensive list search to find the element to remove when we are | |
1209 | discarding the list afterwards */ | |
1210 | if ((remove_from_parent_p) && (var->parent != NULL)) | |
1211 | { | |
1212 | VEC_replace (varobj_p, var->parent->children, var->index, NULL); | |
1213 | } | |
1214 | ||
1215 | if (var->obj_name != NULL) | |
1216 | uninstall_variable (var); | |
1217 | ||
1218 | /* Free memory associated with this variable */ | |
1219 | free_variable (var); | |
1220 | } | |
1221 | ||
1222 | /* Install the given variable VAR with the object name VAR->OBJ_NAME. */ | |
1223 | static int | |
1224 | install_variable (struct varobj *var) | |
1225 | { | |
1226 | struct vlist *cv; | |
1227 | struct vlist *newvl; | |
1228 | const char *chp; | |
1229 | unsigned int index = 0; | |
1230 | unsigned int i = 1; | |
1231 | ||
1232 | for (chp = var->obj_name; *chp; chp++) | |
1233 | { | |
1234 | index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; | |
1235 | } | |
1236 | ||
1237 | cv = *(varobj_table + index); | |
1238 | while ((cv != NULL) && (strcmp (cv->var->obj_name, var->obj_name) != 0)) | |
1239 | cv = cv->next; | |
1240 | ||
1241 | if (cv != NULL) | |
1242 | error (_("Duplicate variable object name")); | |
1243 | ||
1244 | /* Add varobj to hash table */ | |
1245 | newvl = xmalloc (sizeof (struct vlist)); | |
1246 | newvl->next = *(varobj_table + index); | |
1247 | newvl->var = var; | |
1248 | *(varobj_table + index) = newvl; | |
1249 | ||
1250 | /* If root, add varobj to root list */ | |
1251 | if (is_root_p (var)) | |
1252 | { | |
1253 | /* Add to list of root variables */ | |
1254 | if (rootlist == NULL) | |
1255 | var->root->next = NULL; | |
1256 | else | |
1257 | var->root->next = rootlist; | |
1258 | rootlist = var->root; | |
1259 | rootcount++; | |
1260 | } | |
1261 | ||
1262 | return 1; /* OK */ | |
1263 | } | |
1264 | ||
1265 | /* Unistall the object VAR. */ | |
1266 | static void | |
1267 | uninstall_variable (struct varobj *var) | |
1268 | { | |
1269 | struct vlist *cv; | |
1270 | struct vlist *prev; | |
1271 | struct varobj_root *cr; | |
1272 | struct varobj_root *prer; | |
1273 | const char *chp; | |
1274 | unsigned int index = 0; | |
1275 | unsigned int i = 1; | |
1276 | ||
1277 | /* Remove varobj from hash table */ | |
1278 | for (chp = var->obj_name; *chp; chp++) | |
1279 | { | |
1280 | index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; | |
1281 | } | |
1282 | ||
1283 | cv = *(varobj_table + index); | |
1284 | prev = NULL; | |
1285 | while ((cv != NULL) && (strcmp (cv->var->obj_name, var->obj_name) != 0)) | |
1286 | { | |
1287 | prev = cv; | |
1288 | cv = cv->next; | |
1289 | } | |
1290 | ||
1291 | if (varobjdebug) | |
1292 | fprintf_unfiltered (gdb_stdlog, "Deleting %s\n", var->obj_name); | |
1293 | ||
1294 | if (cv == NULL) | |
1295 | { | |
1296 | warning | |
1297 | ("Assertion failed: Could not find variable object \"%s\" to delete", | |
1298 | var->obj_name); | |
1299 | return; | |
1300 | } | |
1301 | ||
1302 | if (prev == NULL) | |
1303 | *(varobj_table + index) = cv->next; | |
1304 | else | |
1305 | prev->next = cv->next; | |
1306 | ||
1307 | xfree (cv); | |
1308 | ||
1309 | /* If root, remove varobj from root list */ | |
1310 | if (is_root_p (var)) | |
1311 | { | |
1312 | /* Remove from list of root variables */ | |
1313 | if (rootlist == var->root) | |
1314 | rootlist = var->root->next; | |
1315 | else | |
1316 | { | |
1317 | prer = NULL; | |
1318 | cr = rootlist; | |
1319 | while ((cr != NULL) && (cr->rootvar != var)) | |
1320 | { | |
1321 | prer = cr; | |
1322 | cr = cr->next; | |
1323 | } | |
1324 | if (cr == NULL) | |
1325 | { | |
1326 | warning | |
1327 | ("Assertion failed: Could not find varobj \"%s\" in root list", | |
1328 | var->obj_name); | |
1329 | return; | |
1330 | } | |
1331 | if (prer == NULL) | |
1332 | rootlist = NULL; | |
1333 | else | |
1334 | prer->next = cr->next; | |
1335 | } | |
1336 | rootcount--; | |
1337 | } | |
1338 | ||
1339 | } | |
1340 | ||
1341 | /* Create and install a child of the parent of the given name */ | |
1342 | static struct varobj * | |
1343 | create_child (struct varobj *parent, int index, char *name) | |
1344 | { | |
1345 | struct varobj *child; | |
1346 | char *childs_name; | |
1347 | struct value *value; | |
1348 | ||
1349 | child = new_variable (); | |
1350 | ||
1351 | /* name is allocated by name_of_child */ | |
1352 | child->name = name; | |
1353 | child->index = index; | |
1354 | value = value_of_child (parent, index); | |
1355 | child->parent = parent; | |
1356 | child->root = parent->root; | |
1357 | childs_name = xstrprintf ("%s.%s", parent->obj_name, name); | |
1358 | child->obj_name = childs_name; | |
1359 | install_variable (child); | |
1360 | ||
1361 | /* Compute the type of the child. Must do this before | |
1362 | calling install_new_value. */ | |
1363 | if (value != NULL) | |
1364 | /* If the child had no evaluation errors, var->value | |
1365 | will be non-NULL and contain a valid type. */ | |
1366 | child->type = value_type (value); | |
1367 | else | |
1368 | /* Otherwise, we must compute the type. */ | |
1369 | child->type = (*child->root->lang->type_of_child) (child->parent, | |
1370 | child->index); | |
1371 | install_new_value (child, value, 1); | |
1372 | ||
1373 | if ((!CPLUS_FAKE_CHILD (child) && child->value == NULL) || parent->error) | |
1374 | child->error = 1; | |
1375 | ||
1376 | return child; | |
1377 | } | |
1378 | \f | |
1379 | ||
1380 | /* | |
1381 | * Miscellaneous utility functions. | |
1382 | */ | |
1383 | ||
1384 | /* Allocate memory and initialize a new variable */ | |
1385 | static struct varobj * | |
1386 | new_variable (void) | |
1387 | { | |
1388 | struct varobj *var; | |
1389 | ||
1390 | var = (struct varobj *) xmalloc (sizeof (struct varobj)); | |
1391 | var->name = NULL; | |
1392 | var->obj_name = NULL; | |
1393 | var->index = -1; | |
1394 | var->type = NULL; | |
1395 | var->value = NULL; | |
1396 | var->error = 0; | |
1397 | var->num_children = -1; | |
1398 | var->parent = NULL; | |
1399 | var->children = NULL; | |
1400 | var->format = 0; | |
1401 | var->root = NULL; | |
1402 | var->updated = 0; | |
1403 | var->print_value = NULL; | |
1404 | ||
1405 | return var; | |
1406 | } | |
1407 | ||
1408 | /* Allocate memory and initialize a new root variable */ | |
1409 | static struct varobj * | |
1410 | new_root_variable (void) | |
1411 | { | |
1412 | struct varobj *var = new_variable (); | |
1413 | var->root = (struct varobj_root *) xmalloc (sizeof (struct varobj_root));; | |
1414 | var->root->lang = NULL; | |
1415 | var->root->exp = NULL; | |
1416 | var->root->valid_block = NULL; | |
1417 | var->root->frame = null_frame_id; | |
1418 | var->root->use_selected_frame = 0; | |
1419 | var->root->rootvar = NULL; | |
1420 | ||
1421 | return var; | |
1422 | } | |
1423 | ||
1424 | /* Free any allocated memory associated with VAR. */ | |
1425 | static void | |
1426 | free_variable (struct varobj *var) | |
1427 | { | |
1428 | /* Free the expression if this is a root variable. */ | |
1429 | if (is_root_p (var)) | |
1430 | { | |
1431 | free_current_contents (&var->root->exp); | |
1432 | xfree (var->root); | |
1433 | } | |
1434 | ||
1435 | xfree (var->name); | |
1436 | xfree (var->obj_name); | |
1437 | xfree (var->print_value); | |
1438 | xfree (var); | |
1439 | } | |
1440 | ||
1441 | static void | |
1442 | do_free_variable_cleanup (void *var) | |
1443 | { | |
1444 | free_variable (var); | |
1445 | } | |
1446 | ||
1447 | static struct cleanup * | |
1448 | make_cleanup_free_variable (struct varobj *var) | |
1449 | { | |
1450 | return make_cleanup (do_free_variable_cleanup, var); | |
1451 | } | |
1452 | ||
1453 | /* This returns the type of the variable. It also skips past typedefs | |
1454 | to return the real type of the variable. | |
1455 | ||
1456 | NOTE: TYPE_TARGET_TYPE should NOT be used anywhere in this file | |
1457 | except within get_target_type and get_type. */ | |
1458 | static struct type * | |
1459 | get_type (struct varobj *var) | |
1460 | { | |
1461 | struct type *type; | |
1462 | type = var->type; | |
1463 | ||
1464 | if (type != NULL) | |
1465 | type = check_typedef (type); | |
1466 | ||
1467 | return type; | |
1468 | } | |
1469 | ||
1470 | /* This returns the type of the variable, dereferencing references, pointers | |
1471 | and references to pointers, too. */ | |
1472 | static struct type * | |
1473 | get_type_deref (struct varobj *var) | |
1474 | { | |
1475 | struct type *type; | |
1476 | ||
1477 | type = get_type (var); | |
1478 | ||
1479 | if (type) | |
1480 | { | |
1481 | if (TYPE_CODE (type) == TYPE_CODE_REF) | |
1482 | type = get_target_type (type); | |
1483 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
1484 | type = get_target_type (type); | |
1485 | } | |
1486 | ||
1487 | return type; | |
1488 | } | |
1489 | ||
1490 | /* This returns the target type (or NULL) of TYPE, also skipping | |
1491 | past typedefs, just like get_type (). | |
1492 | ||
1493 | NOTE: TYPE_TARGET_TYPE should NOT be used anywhere in this file | |
1494 | except within get_target_type and get_type. */ | |
1495 | static struct type * | |
1496 | get_target_type (struct type *type) | |
1497 | { | |
1498 | if (type != NULL) | |
1499 | { | |
1500 | type = TYPE_TARGET_TYPE (type); | |
1501 | if (type != NULL) | |
1502 | type = check_typedef (type); | |
1503 | } | |
1504 | ||
1505 | return type; | |
1506 | } | |
1507 | ||
1508 | /* What is the default display for this variable? We assume that | |
1509 | everything is "natural". Any exceptions? */ | |
1510 | static enum varobj_display_formats | |
1511 | variable_default_display (struct varobj *var) | |
1512 | { | |
1513 | return FORMAT_NATURAL; | |
1514 | } | |
1515 | ||
1516 | /* FIXME: The following should be generic for any pointer */ | |
1517 | static void | |
1518 | cppush (struct cpstack **pstack, char *name) | |
1519 | { | |
1520 | struct cpstack *s; | |
1521 | ||
1522 | s = (struct cpstack *) xmalloc (sizeof (struct cpstack)); | |
1523 | s->name = name; | |
1524 | s->next = *pstack; | |
1525 | *pstack = s; | |
1526 | } | |
1527 | ||
1528 | /* FIXME: The following should be generic for any pointer */ | |
1529 | static char * | |
1530 | cppop (struct cpstack **pstack) | |
1531 | { | |
1532 | struct cpstack *s; | |
1533 | char *v; | |
1534 | ||
1535 | if ((*pstack)->name == NULL && (*pstack)->next == NULL) | |
1536 | return NULL; | |
1537 | ||
1538 | s = *pstack; | |
1539 | v = s->name; | |
1540 | *pstack = (*pstack)->next; | |
1541 | xfree (s); | |
1542 | ||
1543 | return v; | |
1544 | } | |
1545 | \f | |
1546 | /* | |
1547 | * Language-dependencies | |
1548 | */ | |
1549 | ||
1550 | /* Common entry points */ | |
1551 | ||
1552 | /* Get the language of variable VAR. */ | |
1553 | static enum varobj_languages | |
1554 | variable_language (struct varobj *var) | |
1555 | { | |
1556 | enum varobj_languages lang; | |
1557 | ||
1558 | switch (var->root->exp->language_defn->la_language) | |
1559 | { | |
1560 | default: | |
1561 | case language_c: | |
1562 | lang = vlang_c; | |
1563 | break; | |
1564 | case language_cplus: | |
1565 | lang = vlang_cplus; | |
1566 | break; | |
1567 | case language_java: | |
1568 | lang = vlang_java; | |
1569 | break; | |
1570 | } | |
1571 | ||
1572 | return lang; | |
1573 | } | |
1574 | ||
1575 | /* Return the number of children for a given variable. | |
1576 | The result of this function is defined by the language | |
1577 | implementation. The number of children returned by this function | |
1578 | is the number of children that the user will see in the variable | |
1579 | display. */ | |
1580 | static int | |
1581 | number_of_children (struct varobj *var) | |
1582 | { | |
1583 | return (*var->root->lang->number_of_children) (var);; | |
1584 | } | |
1585 | ||
1586 | /* What is the expression for the root varobj VAR? Returns a malloc'd string. */ | |
1587 | static char * | |
1588 | name_of_variable (struct varobj *var) | |
1589 | { | |
1590 | return (*var->root->lang->name_of_variable) (var); | |
1591 | } | |
1592 | ||
1593 | /* What is the name of the INDEX'th child of VAR? Returns a malloc'd string. */ | |
1594 | static char * | |
1595 | name_of_child (struct varobj *var, int index) | |
1596 | { | |
1597 | return (*var->root->lang->name_of_child) (var, index); | |
1598 | } | |
1599 | ||
1600 | /* What is the ``struct value *'' of the root variable VAR? | |
1601 | TYPE_CHANGED controls what to do if the type of a | |
1602 | use_selected_frame = 1 variable changes. On input, | |
1603 | TYPE_CHANGED = 1 means discard the old varobj, and replace | |
1604 | it with this one. TYPE_CHANGED = 0 means leave it around. | |
1605 | NB: In both cases, var_handle will point to the new varobj, | |
1606 | so if you use TYPE_CHANGED = 0, you will have to stash the | |
1607 | old varobj pointer away somewhere before calling this. | |
1608 | On return, TYPE_CHANGED will be 1 if the type has changed, and | |
1609 | 0 otherwise. */ | |
1610 | static struct value * | |
1611 | value_of_root (struct varobj **var_handle, int *type_changed) | |
1612 | { | |
1613 | struct varobj *var; | |
1614 | ||
1615 | if (var_handle == NULL) | |
1616 | return NULL; | |
1617 | ||
1618 | var = *var_handle; | |
1619 | ||
1620 | /* This should really be an exception, since this should | |
1621 | only get called with a root variable. */ | |
1622 | ||
1623 | if (!is_root_p (var)) | |
1624 | return NULL; | |
1625 | ||
1626 | if (var->root->use_selected_frame) | |
1627 | { | |
1628 | struct varobj *tmp_var; | |
1629 | char *old_type, *new_type; | |
1630 | old_type = varobj_get_type (var); | |
1631 | tmp_var = varobj_create (NULL, var->name, (CORE_ADDR) 0, | |
1632 | USE_SELECTED_FRAME); | |
1633 | if (tmp_var == NULL) | |
1634 | { | |
1635 | return NULL; | |
1636 | } | |
1637 | new_type = varobj_get_type (tmp_var); | |
1638 | if (strcmp (old_type, new_type) == 0) | |
1639 | { | |
1640 | varobj_delete (tmp_var, NULL, 0); | |
1641 | *type_changed = 0; | |
1642 | } | |
1643 | else | |
1644 | { | |
1645 | if (*type_changed) | |
1646 | { | |
1647 | tmp_var->obj_name = | |
1648 | savestring (var->obj_name, strlen (var->obj_name)); | |
1649 | varobj_delete (var, NULL, 0); | |
1650 | } | |
1651 | else | |
1652 | { | |
1653 | tmp_var->obj_name = varobj_gen_name (); | |
1654 | } | |
1655 | install_variable (tmp_var); | |
1656 | *var_handle = tmp_var; | |
1657 | var = *var_handle; | |
1658 | *type_changed = 1; | |
1659 | } | |
1660 | } | |
1661 | else | |
1662 | { | |
1663 | *type_changed = 0; | |
1664 | } | |
1665 | ||
1666 | return (*var->root->lang->value_of_root) (var_handle); | |
1667 | } | |
1668 | ||
1669 | /* What is the ``struct value *'' for the INDEX'th child of PARENT? */ | |
1670 | static struct value * | |
1671 | value_of_child (struct varobj *parent, int index) | |
1672 | { | |
1673 | struct value *value; | |
1674 | ||
1675 | value = (*parent->root->lang->value_of_child) (parent, index); | |
1676 | ||
1677 | return value; | |
1678 | } | |
1679 | ||
1680 | /* Is this variable editable? Use the variable's type to make | |
1681 | this determination. */ | |
1682 | static int | |
1683 | variable_editable (struct varobj *var) | |
1684 | { | |
1685 | return (*var->root->lang->variable_editable) (var); | |
1686 | } | |
1687 | ||
1688 | /* GDB already has a command called "value_of_variable". Sigh. */ | |
1689 | static char * | |
1690 | my_value_of_variable (struct varobj *var) | |
1691 | { | |
1692 | return (*var->root->lang->value_of_variable) (var); | |
1693 | } | |
1694 | ||
1695 | static char * | |
1696 | value_get_print_value (struct value *value, enum varobj_display_formats format) | |
1697 | { | |
1698 | long dummy; | |
1699 | struct ui_file *stb; | |
1700 | struct cleanup *old_chain; | |
1701 | char *thevalue; | |
1702 | ||
1703 | if (value == NULL) | |
1704 | return NULL; | |
1705 | ||
1706 | stb = mem_fileopen (); | |
1707 | old_chain = make_cleanup_ui_file_delete (stb); | |
1708 | ||
1709 | common_val_print (value, stb, format_code[(int) format], 1, 0, 0); | |
1710 | thevalue = ui_file_xstrdup (stb, &dummy); | |
1711 | ||
1712 | do_cleanups (old_chain); | |
1713 | return thevalue; | |
1714 | } | |
1715 | ||
1716 | /* Return non-zero if changes in value of VAR | |
1717 | must be detected and reported by -var-update. | |
1718 | Return zero is -var-update should never report | |
1719 | changes of such values. This makes sense for structures | |
1720 | (since the changes in children values will be reported separately), | |
1721 | or for artifical objects (like 'public' pseudo-field in C++). | |
1722 | ||
1723 | Return value of 0 means that gdb need not call value_fetch_lazy | |
1724 | for the value of this variable object. */ | |
1725 | static int | |
1726 | varobj_value_is_changeable_p (struct varobj *var) | |
1727 | { | |
1728 | int r; | |
1729 | struct type *type; | |
1730 | ||
1731 | if (CPLUS_FAKE_CHILD (var)) | |
1732 | return 0; | |
1733 | ||
1734 | type = get_type (var); | |
1735 | ||
1736 | switch (TYPE_CODE (type)) | |
1737 | { | |
1738 | case TYPE_CODE_STRUCT: | |
1739 | case TYPE_CODE_UNION: | |
1740 | case TYPE_CODE_ARRAY: | |
1741 | r = 0; | |
1742 | break; | |
1743 | ||
1744 | default: | |
1745 | r = 1; | |
1746 | } | |
1747 | ||
1748 | return r; | |
1749 | } | |
1750 | ||
1751 | /* C */ | |
1752 | static int | |
1753 | c_number_of_children (struct varobj *var) | |
1754 | { | |
1755 | struct type *type; | |
1756 | struct type *target; | |
1757 | int children; | |
1758 | ||
1759 | type = get_type (var); | |
1760 | target = get_target_type (type); | |
1761 | children = 0; | |
1762 | ||
1763 | switch (TYPE_CODE (type)) | |
1764 | { | |
1765 | case TYPE_CODE_ARRAY: | |
1766 | if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (target) > 0 | |
1767 | && TYPE_ARRAY_UPPER_BOUND_TYPE (type) != BOUND_CANNOT_BE_DETERMINED) | |
1768 | children = TYPE_LENGTH (type) / TYPE_LENGTH (target); | |
1769 | else | |
1770 | /* If we don't know how many elements there are, don't display | |
1771 | any. */ | |
1772 | children = 0; | |
1773 | break; | |
1774 | ||
1775 | case TYPE_CODE_STRUCT: | |
1776 | case TYPE_CODE_UNION: | |
1777 | children = TYPE_NFIELDS (type); | |
1778 | break; | |
1779 | ||
1780 | case TYPE_CODE_PTR: | |
1781 | /* This is where things get complicated. All pointers have one child. | |
1782 | Except, of course, for struct and union ptr, which we automagically | |
1783 | dereference for the user, and function ptrs which have no children. | |
1784 | We also don't dereference void* as we don't know what to show. | |
1785 | We can show char* so we allow it to be dereferenced. If you decide | |
1786 | to test for it, please mind that a little magic is necessary to | |
1787 | properly identify it: char* has TYPE_CODE == TYPE_CODE_INT and | |
1788 | TYPE_NAME == "char" */ | |
1789 | ||
1790 | switch (TYPE_CODE (target)) | |
1791 | { | |
1792 | case TYPE_CODE_STRUCT: | |
1793 | case TYPE_CODE_UNION: | |
1794 | children = TYPE_NFIELDS (target); | |
1795 | break; | |
1796 | ||
1797 | case TYPE_CODE_FUNC: | |
1798 | case TYPE_CODE_VOID: | |
1799 | children = 0; | |
1800 | break; | |
1801 | ||
1802 | default: | |
1803 | children = 1; | |
1804 | } | |
1805 | break; | |
1806 | ||
1807 | default: | |
1808 | /* Other types have no children */ | |
1809 | break; | |
1810 | } | |
1811 | ||
1812 | return children; | |
1813 | } | |
1814 | ||
1815 | static char * | |
1816 | c_name_of_variable (struct varobj *parent) | |
1817 | { | |
1818 | return savestring (parent->name, strlen (parent->name)); | |
1819 | } | |
1820 | ||
1821 | /* Return the value of element TYPE_INDEX of a structure | |
1822 | value VALUE. VALUE's type should be a structure, | |
1823 | or union, or a typedef to struct/union. | |
1824 | ||
1825 | Returns NULL if getting the value fails. Never throws. */ | |
1826 | static struct value * | |
1827 | value_struct_element_index (struct value *value, int type_index) | |
1828 | { | |
1829 | struct value *result = NULL; | |
1830 | volatile struct gdb_exception e; | |
1831 | ||
1832 | struct type *type = value_type (value); | |
1833 | type = check_typedef (type); | |
1834 | ||
1835 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
1836 | || TYPE_CODE (type) == TYPE_CODE_UNION); | |
1837 | ||
1838 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
1839 | { | |
1840 | if (TYPE_FIELD_STATIC (type, type_index)) | |
1841 | result = value_static_field (type, type_index); | |
1842 | else | |
1843 | result = value_primitive_field (value, 0, type_index, type); | |
1844 | } | |
1845 | if (e.reason < 0) | |
1846 | { | |
1847 | return NULL; | |
1848 | } | |
1849 | else | |
1850 | { | |
1851 | return result; | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | /* Obtain the information about child INDEX of the variable | |
1856 | object PARENT. | |
1857 | If CNAME is not null, sets *CNAME to the name of the child relative | |
1858 | to the parent. | |
1859 | If CVALUE is not null, sets *CVALUE to the value of the child. | |
1860 | If CTYPE is not null, sets *CTYPE to the type of the child. | |
1861 | ||
1862 | If any of CNAME, CVALUE, or CTYPE is not null, but the corresponding | |
1863 | information cannot be determined, set *CNAME, *CVALUE, or *CTYPE | |
1864 | to NULL. */ | |
1865 | static void | |
1866 | c_describe_child (struct varobj *parent, int index, | |
1867 | char **cname, struct value **cvalue, struct type **ctype) | |
1868 | { | |
1869 | struct value *value = parent->value; | |
1870 | struct type *type = get_type (parent); | |
1871 | ||
1872 | if (cname) | |
1873 | *cname = NULL; | |
1874 | if (cvalue) | |
1875 | *cvalue = NULL; | |
1876 | if (ctype) | |
1877 | *ctype = NULL; | |
1878 | ||
1879 | /* Pointers to structures are treated just like | |
1880 | structures when accessing children. */ | |
1881 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
1882 | { | |
1883 | struct type *target_type = get_target_type (type); | |
1884 | if (TYPE_CODE (target_type) == TYPE_CODE_STRUCT | |
1885 | || TYPE_CODE (target_type) == TYPE_CODE_UNION) | |
1886 | { | |
1887 | if (value) | |
1888 | gdb_value_ind (value, &value); | |
1889 | type = target_type; | |
1890 | } | |
1891 | } | |
1892 | ||
1893 | switch (TYPE_CODE (type)) | |
1894 | { | |
1895 | case TYPE_CODE_ARRAY: | |
1896 | if (cname) | |
1897 | *cname = xstrprintf ("%d", index | |
1898 | + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type))); | |
1899 | ||
1900 | if (cvalue && value) | |
1901 | { | |
1902 | int real_index = index + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)); | |
1903 | struct value *indval = | |
1904 | value_from_longest (builtin_type_int, (LONGEST) real_index); | |
1905 | gdb_value_subscript (value, indval, cvalue); | |
1906 | } | |
1907 | ||
1908 | if (ctype) | |
1909 | *ctype = get_target_type (type); | |
1910 | ||
1911 | break; | |
1912 | ||
1913 | case TYPE_CODE_STRUCT: | |
1914 | case TYPE_CODE_UNION: | |
1915 | if (cname) | |
1916 | { | |
1917 | char *string = TYPE_FIELD_NAME (type, index); | |
1918 | *cname = savestring (string, strlen (string)); | |
1919 | } | |
1920 | ||
1921 | if (cvalue && value) | |
1922 | { | |
1923 | /* For C, varobj index is the same as type index. */ | |
1924 | *cvalue = value_struct_element_index (value, index); | |
1925 | } | |
1926 | ||
1927 | if (ctype) | |
1928 | *ctype = TYPE_FIELD_TYPE (type, index); | |
1929 | ||
1930 | break; | |
1931 | ||
1932 | case TYPE_CODE_PTR: | |
1933 | if (cname) | |
1934 | *cname = xstrprintf ("*%s", parent->name); | |
1935 | ||
1936 | if (cvalue && value) | |
1937 | gdb_value_ind (value, cvalue); | |
1938 | ||
1939 | if (ctype) | |
1940 | *ctype = get_target_type (type); | |
1941 | ||
1942 | break; | |
1943 | ||
1944 | default: | |
1945 | /* This should not happen */ | |
1946 | if (cname) | |
1947 | *cname = xstrdup ("???"); | |
1948 | /* Don't set value and type, we don't know then. */ | |
1949 | } | |
1950 | } | |
1951 | ||
1952 | static char * | |
1953 | c_name_of_child (struct varobj *parent, int index) | |
1954 | { | |
1955 | char *name; | |
1956 | c_describe_child (parent, index, &name, NULL, NULL); | |
1957 | return name; | |
1958 | } | |
1959 | ||
1960 | static struct value * | |
1961 | c_value_of_root (struct varobj **var_handle) | |
1962 | { | |
1963 | struct value *new_val = NULL; | |
1964 | struct varobj *var = *var_handle; | |
1965 | struct frame_info *fi; | |
1966 | int within_scope; | |
1967 | ||
1968 | /* Only root variables can be updated... */ | |
1969 | if (!is_root_p (var)) | |
1970 | /* Not a root var */ | |
1971 | return NULL; | |
1972 | ||
1973 | ||
1974 | /* Determine whether the variable is still around. */ | |
1975 | if (var->root->valid_block == NULL) | |
1976 | within_scope = 1; | |
1977 | else | |
1978 | { | |
1979 | reinit_frame_cache (); | |
1980 | fi = frame_find_by_id (var->root->frame); | |
1981 | within_scope = fi != NULL; | |
1982 | /* FIXME: select_frame could fail */ | |
1983 | if (fi) | |
1984 | { | |
1985 | CORE_ADDR pc = get_frame_pc (fi); | |
1986 | if (pc < BLOCK_START (var->root->valid_block) || | |
1987 | pc >= BLOCK_END (var->root->valid_block)) | |
1988 | within_scope = 0; | |
1989 | else | |
1990 | select_frame (fi); | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | if (within_scope) | |
1995 | { | |
1996 | /* We need to catch errors here, because if evaluate | |
1997 | expression fails we just want to make val->error = 1 and | |
1998 | go on */ | |
1999 | if (gdb_evaluate_expression (var->root->exp, &new_val)) | |
2000 | { | |
2001 | var->error = 0; | |
2002 | release_value (new_val); | |
2003 | } | |
2004 | else | |
2005 | var->error = 1; | |
2006 | ||
2007 | return new_val; | |
2008 | } | |
2009 | ||
2010 | return NULL; | |
2011 | } | |
2012 | ||
2013 | static struct value * | |
2014 | c_value_of_child (struct varobj *parent, int index) | |
2015 | { | |
2016 | struct value *value = NULL; | |
2017 | c_describe_child (parent, index, NULL, &value, NULL); | |
2018 | if (value != NULL) | |
2019 | release_value (value); | |
2020 | ||
2021 | return value; | |
2022 | } | |
2023 | ||
2024 | static struct type * | |
2025 | c_type_of_child (struct varobj *parent, int index) | |
2026 | { | |
2027 | struct type *type = NULL; | |
2028 | c_describe_child (parent, index, NULL, NULL, &type); | |
2029 | return type; | |
2030 | } | |
2031 | ||
2032 | static int | |
2033 | c_variable_editable (struct varobj *var) | |
2034 | { | |
2035 | switch (TYPE_CODE (get_type (var))) | |
2036 | { | |
2037 | case TYPE_CODE_STRUCT: | |
2038 | case TYPE_CODE_UNION: | |
2039 | case TYPE_CODE_ARRAY: | |
2040 | case TYPE_CODE_FUNC: | |
2041 | case TYPE_CODE_METHOD: | |
2042 | return 0; | |
2043 | break; | |
2044 | ||
2045 | default: | |
2046 | return 1; | |
2047 | break; | |
2048 | } | |
2049 | } | |
2050 | ||
2051 | static char * | |
2052 | c_value_of_variable (struct varobj *var) | |
2053 | { | |
2054 | /* BOGUS: if val_print sees a struct/class, or a reference to one, | |
2055 | it will print out its children instead of "{...}". So we need to | |
2056 | catch that case explicitly. */ | |
2057 | struct type *type = get_type (var); | |
2058 | ||
2059 | /* Strip top-level references. */ | |
2060 | while (TYPE_CODE (type) == TYPE_CODE_REF) | |
2061 | type = check_typedef (TYPE_TARGET_TYPE (type)); | |
2062 | ||
2063 | switch (TYPE_CODE (type)) | |
2064 | { | |
2065 | case TYPE_CODE_STRUCT: | |
2066 | case TYPE_CODE_UNION: | |
2067 | return xstrdup ("{...}"); | |
2068 | /* break; */ | |
2069 | ||
2070 | case TYPE_CODE_ARRAY: | |
2071 | { | |
2072 | char *number; | |
2073 | number = xstrprintf ("[%d]", var->num_children); | |
2074 | return (number); | |
2075 | } | |
2076 | /* break; */ | |
2077 | ||
2078 | default: | |
2079 | { | |
2080 | if (var->value == NULL) | |
2081 | { | |
2082 | /* This can happen if we attempt to get the value of a struct | |
2083 | member when the parent is an invalid pointer. This is an | |
2084 | error condition, so we should tell the caller. */ | |
2085 | return NULL; | |
2086 | } | |
2087 | else | |
2088 | { | |
2089 | gdb_assert (varobj_value_is_changeable_p (var)); | |
2090 | gdb_assert (!value_lazy (var->value)); | |
2091 | return value_get_print_value (var->value, var->format); | |
2092 | } | |
2093 | } | |
2094 | } | |
2095 | } | |
2096 | \f | |
2097 | ||
2098 | /* C++ */ | |
2099 | ||
2100 | static int | |
2101 | cplus_number_of_children (struct varobj *var) | |
2102 | { | |
2103 | struct type *type; | |
2104 | int children, dont_know; | |
2105 | ||
2106 | dont_know = 1; | |
2107 | children = 0; | |
2108 | ||
2109 | if (!CPLUS_FAKE_CHILD (var)) | |
2110 | { | |
2111 | type = get_type_deref (var); | |
2112 | ||
2113 | if (((TYPE_CODE (type)) == TYPE_CODE_STRUCT) || | |
2114 | ((TYPE_CODE (type)) == TYPE_CODE_UNION)) | |
2115 | { | |
2116 | int kids[3]; | |
2117 | ||
2118 | cplus_class_num_children (type, kids); | |
2119 | if (kids[v_public] != 0) | |
2120 | children++; | |
2121 | if (kids[v_private] != 0) | |
2122 | children++; | |
2123 | if (kids[v_protected] != 0) | |
2124 | children++; | |
2125 | ||
2126 | /* Add any baseclasses */ | |
2127 | children += TYPE_N_BASECLASSES (type); | |
2128 | dont_know = 0; | |
2129 | ||
2130 | /* FIXME: save children in var */ | |
2131 | } | |
2132 | } | |
2133 | else | |
2134 | { | |
2135 | int kids[3]; | |
2136 | ||
2137 | type = get_type_deref (var->parent); | |
2138 | ||
2139 | cplus_class_num_children (type, kids); | |
2140 | if (strcmp (var->name, "public") == 0) | |
2141 | children = kids[v_public]; | |
2142 | else if (strcmp (var->name, "private") == 0) | |
2143 | children = kids[v_private]; | |
2144 | else | |
2145 | children = kids[v_protected]; | |
2146 | dont_know = 0; | |
2147 | } | |
2148 | ||
2149 | if (dont_know) | |
2150 | children = c_number_of_children (var); | |
2151 | ||
2152 | return children; | |
2153 | } | |
2154 | ||
2155 | /* Compute # of public, private, and protected variables in this class. | |
2156 | That means we need to descend into all baseclasses and find out | |
2157 | how many are there, too. */ | |
2158 | static void | |
2159 | cplus_class_num_children (struct type *type, int children[3]) | |
2160 | { | |
2161 | int i; | |
2162 | ||
2163 | children[v_public] = 0; | |
2164 | children[v_private] = 0; | |
2165 | children[v_protected] = 0; | |
2166 | ||
2167 | for (i = TYPE_N_BASECLASSES (type); i < TYPE_NFIELDS (type); i++) | |
2168 | { | |
2169 | /* If we have a virtual table pointer, omit it. */ | |
2170 | if (TYPE_VPTR_BASETYPE (type) == type && TYPE_VPTR_FIELDNO (type) == i) | |
2171 | continue; | |
2172 | ||
2173 | if (TYPE_FIELD_PROTECTED (type, i)) | |
2174 | children[v_protected]++; | |
2175 | else if (TYPE_FIELD_PRIVATE (type, i)) | |
2176 | children[v_private]++; | |
2177 | else | |
2178 | children[v_public]++; | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | static char * | |
2183 | cplus_name_of_variable (struct varobj *parent) | |
2184 | { | |
2185 | return c_name_of_variable (parent); | |
2186 | } | |
2187 | ||
2188 | static char * | |
2189 | cplus_name_of_child (struct varobj *parent, int index) | |
2190 | { | |
2191 | char *name; | |
2192 | struct type *type; | |
2193 | ||
2194 | if (CPLUS_FAKE_CHILD (parent)) | |
2195 | { | |
2196 | /* Looking for children of public, private, or protected. */ | |
2197 | type = get_type_deref (parent->parent); | |
2198 | } | |
2199 | else | |
2200 | type = get_type_deref (parent); | |
2201 | ||
2202 | name = NULL; | |
2203 | switch (TYPE_CODE (type)) | |
2204 | { | |
2205 | case TYPE_CODE_STRUCT: | |
2206 | case TYPE_CODE_UNION: | |
2207 | if (CPLUS_FAKE_CHILD (parent)) | |
2208 | { | |
2209 | /* The fields of the class type are ordered as they | |
2210 | appear in the class. We are given an index for a | |
2211 | particular access control type ("public","protected", | |
2212 | or "private"). We must skip over fields that don't | |
2213 | have the access control we are looking for to properly | |
2214 | find the indexed field. */ | |
2215 | int type_index = TYPE_N_BASECLASSES (type); | |
2216 | if (strcmp (parent->name, "private") == 0) | |
2217 | { | |
2218 | while (index >= 0) | |
2219 | { | |
2220 | if (TYPE_VPTR_BASETYPE (type) == type | |
2221 | && type_index == TYPE_VPTR_FIELDNO (type)) | |
2222 | ; /* ignore vptr */ | |
2223 | else if (TYPE_FIELD_PRIVATE (type, type_index)) | |
2224 | --index; | |
2225 | ++type_index; | |
2226 | } | |
2227 | --type_index; | |
2228 | } | |
2229 | else if (strcmp (parent->name, "protected") == 0) | |
2230 | { | |
2231 | while (index >= 0) | |
2232 | { | |
2233 | if (TYPE_VPTR_BASETYPE (type) == type | |
2234 | && type_index == TYPE_VPTR_FIELDNO (type)) | |
2235 | ; /* ignore vptr */ | |
2236 | else if (TYPE_FIELD_PROTECTED (type, type_index)) | |
2237 | --index; | |
2238 | ++type_index; | |
2239 | } | |
2240 | --type_index; | |
2241 | } | |
2242 | else | |
2243 | { | |
2244 | while (index >= 0) | |
2245 | { | |
2246 | if (TYPE_VPTR_BASETYPE (type) == type | |
2247 | && type_index == TYPE_VPTR_FIELDNO (type)) | |
2248 | ; /* ignore vptr */ | |
2249 | else if (!TYPE_FIELD_PRIVATE (type, type_index) && | |
2250 | !TYPE_FIELD_PROTECTED (type, type_index)) | |
2251 | --index; | |
2252 | ++type_index; | |
2253 | } | |
2254 | --type_index; | |
2255 | } | |
2256 | ||
2257 | name = TYPE_FIELD_NAME (type, type_index); | |
2258 | } | |
2259 | else if (index < TYPE_N_BASECLASSES (type)) | |
2260 | /* We are looking up the name of a base class */ | |
2261 | name = TYPE_FIELD_NAME (type, index); | |
2262 | else | |
2263 | { | |
2264 | int children[3]; | |
2265 | cplus_class_num_children(type, children); | |
2266 | ||
2267 | /* Everything beyond the baseclasses can | |
2268 | only be "public", "private", or "protected" | |
2269 | ||
2270 | The special "fake" children are always output by varobj in | |
2271 | this order. So if INDEX == 2, it MUST be "protected". */ | |
2272 | index -= TYPE_N_BASECLASSES (type); | |
2273 | switch (index) | |
2274 | { | |
2275 | case 0: | |
2276 | if (children[v_public] > 0) | |
2277 | name = "public"; | |
2278 | else if (children[v_private] > 0) | |
2279 | name = "private"; | |
2280 | else | |
2281 | name = "protected"; | |
2282 | break; | |
2283 | case 1: | |
2284 | if (children[v_public] > 0) | |
2285 | { | |
2286 | if (children[v_private] > 0) | |
2287 | name = "private"; | |
2288 | else | |
2289 | name = "protected"; | |
2290 | } | |
2291 | else if (children[v_private] > 0) | |
2292 | name = "protected"; | |
2293 | break; | |
2294 | case 2: | |
2295 | /* Must be protected */ | |
2296 | name = "protected"; | |
2297 | break; | |
2298 | default: | |
2299 | /* error! */ | |
2300 | break; | |
2301 | } | |
2302 | } | |
2303 | break; | |
2304 | ||
2305 | default: | |
2306 | break; | |
2307 | } | |
2308 | ||
2309 | if (name == NULL) | |
2310 | return c_name_of_child (parent, index); | |
2311 | else | |
2312 | { | |
2313 | if (name != NULL) | |
2314 | name = savestring (name, strlen (name)); | |
2315 | } | |
2316 | ||
2317 | return name; | |
2318 | } | |
2319 | ||
2320 | static struct value * | |
2321 | cplus_value_of_root (struct varobj **var_handle) | |
2322 | { | |
2323 | return c_value_of_root (var_handle); | |
2324 | } | |
2325 | ||
2326 | static struct value * | |
2327 | cplus_value_of_child (struct varobj *parent, int index) | |
2328 | { | |
2329 | struct type *type; | |
2330 | struct value *value; | |
2331 | ||
2332 | if (CPLUS_FAKE_CHILD (parent)) | |
2333 | type = get_type_deref (parent->parent); | |
2334 | else | |
2335 | type = get_type_deref (parent); | |
2336 | ||
2337 | value = NULL; | |
2338 | ||
2339 | if (((TYPE_CODE (type)) == TYPE_CODE_STRUCT) || | |
2340 | ((TYPE_CODE (type)) == TYPE_CODE_UNION)) | |
2341 | { | |
2342 | if (CPLUS_FAKE_CHILD (parent)) | |
2343 | { | |
2344 | char *name; | |
2345 | struct value *temp = parent->parent->value; | |
2346 | ||
2347 | if (temp == NULL) | |
2348 | return NULL; | |
2349 | ||
2350 | name = name_of_child (parent, index); | |
2351 | gdb_value_struct_elt (NULL, &value, &temp, NULL, name, NULL, | |
2352 | "cplus_structure"); | |
2353 | if (value != NULL) | |
2354 | release_value (value); | |
2355 | ||
2356 | xfree (name); | |
2357 | } | |
2358 | else if (index >= TYPE_N_BASECLASSES (type)) | |
2359 | { | |
2360 | /* public, private, or protected */ | |
2361 | return NULL; | |
2362 | } | |
2363 | else | |
2364 | { | |
2365 | /* Baseclass */ | |
2366 | if (parent->value != NULL) | |
2367 | { | |
2368 | struct value *temp = NULL; | |
2369 | ||
2370 | /* No special processing for references is needed -- | |
2371 | value_cast below handles references. */ | |
2372 | if (TYPE_CODE (value_type (parent->value)) == TYPE_CODE_PTR) | |
2373 | { | |
2374 | if (!gdb_value_ind (parent->value, &temp)) | |
2375 | return NULL; | |
2376 | } | |
2377 | else | |
2378 | temp = parent->value; | |
2379 | ||
2380 | if (temp != NULL) | |
2381 | { | |
2382 | value = value_cast (TYPE_FIELD_TYPE (type, index), temp); | |
2383 | release_value (value); | |
2384 | } | |
2385 | else | |
2386 | { | |
2387 | /* We failed to evaluate the parent's value, so don't even | |
2388 | bother trying to evaluate this child. */ | |
2389 | return NULL; | |
2390 | } | |
2391 | } | |
2392 | } | |
2393 | } | |
2394 | ||
2395 | if (value == NULL) | |
2396 | return c_value_of_child (parent, index); | |
2397 | ||
2398 | return value; | |
2399 | } | |
2400 | ||
2401 | static struct type * | |
2402 | cplus_type_of_child (struct varobj *parent, int index) | |
2403 | { | |
2404 | struct type *type, *t; | |
2405 | ||
2406 | if (CPLUS_FAKE_CHILD (parent)) | |
2407 | { | |
2408 | /* Looking for the type of a child of public, private, or protected. */ | |
2409 | t = get_type_deref (parent->parent); | |
2410 | } | |
2411 | else | |
2412 | t = get_type_deref (parent); | |
2413 | ||
2414 | type = NULL; | |
2415 | switch (TYPE_CODE (t)) | |
2416 | { | |
2417 | case TYPE_CODE_STRUCT: | |
2418 | case TYPE_CODE_UNION: | |
2419 | if (CPLUS_FAKE_CHILD (parent)) | |
2420 | { | |
2421 | char *name = cplus_name_of_child (parent, index); | |
2422 | type = lookup_struct_elt_type (t, name, 0); | |
2423 | xfree (name); | |
2424 | } | |
2425 | else if (index < TYPE_N_BASECLASSES (t)) | |
2426 | type = TYPE_FIELD_TYPE (t, index); | |
2427 | else | |
2428 | { | |
2429 | /* special */ | |
2430 | return NULL; | |
2431 | } | |
2432 | break; | |
2433 | ||
2434 | default: | |
2435 | break; | |
2436 | } | |
2437 | ||
2438 | if (type == NULL) | |
2439 | return c_type_of_child (parent, index); | |
2440 | ||
2441 | return type; | |
2442 | } | |
2443 | ||
2444 | static int | |
2445 | cplus_variable_editable (struct varobj *var) | |
2446 | { | |
2447 | if (CPLUS_FAKE_CHILD (var)) | |
2448 | return 0; | |
2449 | ||
2450 | return c_variable_editable (var); | |
2451 | } | |
2452 | ||
2453 | static char * | |
2454 | cplus_value_of_variable (struct varobj *var) | |
2455 | { | |
2456 | ||
2457 | /* If we have one of our special types, don't print out | |
2458 | any value. */ | |
2459 | if (CPLUS_FAKE_CHILD (var)) | |
2460 | return xstrdup (""); | |
2461 | ||
2462 | return c_value_of_variable (var); | |
2463 | } | |
2464 | \f | |
2465 | /* Java */ | |
2466 | ||
2467 | static int | |
2468 | java_number_of_children (struct varobj *var) | |
2469 | { | |
2470 | return cplus_number_of_children (var); | |
2471 | } | |
2472 | ||
2473 | static char * | |
2474 | java_name_of_variable (struct varobj *parent) | |
2475 | { | |
2476 | char *p, *name; | |
2477 | ||
2478 | name = cplus_name_of_variable (parent); | |
2479 | /* If the name has "-" in it, it is because we | |
2480 | needed to escape periods in the name... */ | |
2481 | p = name; | |
2482 | ||
2483 | while (*p != '\000') | |
2484 | { | |
2485 | if (*p == '-') | |
2486 | *p = '.'; | |
2487 | p++; | |
2488 | } | |
2489 | ||
2490 | return name; | |
2491 | } | |
2492 | ||
2493 | static char * | |
2494 | java_name_of_child (struct varobj *parent, int index) | |
2495 | { | |
2496 | char *name, *p; | |
2497 | ||
2498 | name = cplus_name_of_child (parent, index); | |
2499 | /* Escape any periods in the name... */ | |
2500 | p = name; | |
2501 | ||
2502 | while (*p != '\000') | |
2503 | { | |
2504 | if (*p == '.') | |
2505 | *p = '-'; | |
2506 | p++; | |
2507 | } | |
2508 | ||
2509 | return name; | |
2510 | } | |
2511 | ||
2512 | static struct value * | |
2513 | java_value_of_root (struct varobj **var_handle) | |
2514 | { | |
2515 | return cplus_value_of_root (var_handle); | |
2516 | } | |
2517 | ||
2518 | static struct value * | |
2519 | java_value_of_child (struct varobj *parent, int index) | |
2520 | { | |
2521 | return cplus_value_of_child (parent, index); | |
2522 | } | |
2523 | ||
2524 | static struct type * | |
2525 | java_type_of_child (struct varobj *parent, int index) | |
2526 | { | |
2527 | return cplus_type_of_child (parent, index); | |
2528 | } | |
2529 | ||
2530 | static int | |
2531 | java_variable_editable (struct varobj *var) | |
2532 | { | |
2533 | return cplus_variable_editable (var); | |
2534 | } | |
2535 | ||
2536 | static char * | |
2537 | java_value_of_variable (struct varobj *var) | |
2538 | { | |
2539 | return cplus_value_of_variable (var); | |
2540 | } | |
2541 | \f | |
2542 | extern void _initialize_varobj (void); | |
2543 | void | |
2544 | _initialize_varobj (void) | |
2545 | { | |
2546 | int sizeof_table = sizeof (struct vlist *) * VAROBJ_TABLE_SIZE; | |
2547 | ||
2548 | varobj_table = xmalloc (sizeof_table); | |
2549 | memset (varobj_table, 0, sizeof_table); | |
2550 | ||
2551 | add_setshow_zinteger_cmd ("debugvarobj", class_maintenance, | |
2552 | &varobjdebug, _("\ | |
2553 | Set varobj debugging."), _("\ | |
2554 | Show varobj debugging."), _("\ | |
2555 | When non-zero, varobj debugging is enabled."), | |
2556 | NULL, | |
2557 | show_varobjdebug, | |
2558 | &setlist, &showlist); | |
2559 | } |