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8b93c638 | 1 | /* Implementation of the GDB variable objects API. |
bc8332bb | 2 | |
b811d2c2 | 3 | Copyright (C) 1999-2020 Free Software Foundation, Inc. |
8b93c638 JM |
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 | |
a9762ec7 | 7 | the Free Software Foundation; either version 3 of the License, or |
8b93c638 JM |
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 | |
a9762ec7 | 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
8b93c638 JM |
17 | |
18 | #include "defs.h" | |
19 | #include "value.h" | |
20 | #include "expression.h" | |
21 | #include "frame.h" | |
8b93c638 | 22 | #include "language.h" |
8b93c638 | 23 | #include "gdbcmd.h" |
d2353924 | 24 | #include "block.h" |
79a45b7d | 25 | #include "valprint.h" |
0cc7d26f | 26 | #include "gdb_regex.h" |
8b93c638 JM |
27 | |
28 | #include "varobj.h" | |
6208b47d VP |
29 | #include "gdbthread.h" |
30 | #include "inferior.h" | |
827f100c | 31 | #include "varobj-iter.h" |
396af9a1 | 32 | #include "parser-defs.h" |
0d12e84c | 33 | #include "gdbarch.h" |
76deb5d9 | 34 | #include <algorithm> |
8b93c638 | 35 | |
b6313243 TT |
36 | #if HAVE_PYTHON |
37 | #include "python/python.h" | |
38 | #include "python/python-internal.h" | |
50389644 PA |
39 | #else |
40 | typedef int PyObject; | |
b6313243 TT |
41 | #endif |
42 | ||
c2c440a9 | 43 | /* See varobj.h. */ |
8b93c638 | 44 | |
ccce17b0 | 45 | unsigned int varobjdebug = 0; |
920d2a44 AC |
46 | static void |
47 | show_varobjdebug (struct ui_file *file, int from_tty, | |
48 | struct cmd_list_element *c, const char *value) | |
49 | { | |
50 | fprintf_filtered (file, _("Varobj debugging is %s.\n"), value); | |
51 | } | |
8b93c638 | 52 | |
581e13c1 | 53 | /* String representations of gdb's format codes. */ |
a121b7c1 | 54 | const char *varobj_format_string[] = |
1c35a88f | 55 | { "natural", "binary", "decimal", "hexadecimal", "octal", "zero-hexadecimal" }; |
8b93c638 | 56 | |
0cc7d26f | 57 | /* True if we want to allow Python-based pretty-printing. */ |
4c37490d | 58 | static bool pretty_printing = false; |
0cc7d26f TT |
59 | |
60 | void | |
61 | varobj_enable_pretty_printing (void) | |
62 | { | |
4c37490d | 63 | pretty_printing = true; |
0cc7d26f TT |
64 | } |
65 | ||
8b93c638 JM |
66 | /* Data structures */ |
67 | ||
68 | /* Every root variable has one of these structures saved in its | |
4d01a485 | 69 | varobj. */ |
8b93c638 | 70 | struct varobj_root |
72330bd6 | 71 | { |
4d01a485 PA |
72 | /* The expression for this parent. */ |
73 | expression_up exp; | |
8b93c638 | 74 | |
581e13c1 | 75 | /* Block for which this expression is valid. */ |
9e5b9d2b | 76 | const struct block *valid_block = NULL; |
8b93c638 | 77 | |
44a67aa7 VP |
78 | /* The frame for this expression. This field is set iff valid_block is |
79 | not NULL. */ | |
9e5b9d2b | 80 | struct frame_id frame = null_frame_id; |
8b93c638 | 81 | |
5d5658a1 | 82 | /* The global thread ID that this varobj_root belongs to. This field |
581e13c1 | 83 | is only valid if valid_block is not NULL. |
c5b48eac VP |
84 | When not 0, indicates which thread 'frame' belongs to. |
85 | When 0, indicates that the thread list was empty when the varobj_root | |
86 | was created. */ | |
9e5b9d2b | 87 | int thread_id = 0; |
c5b48eac | 88 | |
4c37490d | 89 | /* If true, the -var-update always recomputes the value in the |
a5defcdc | 90 | current thread and frame. Otherwise, variable object is |
581e13c1 | 91 | always updated in the specific scope/thread/frame. */ |
4c37490d | 92 | bool floating = false; |
73a93a32 | 93 | |
4c37490d | 94 | /* Flag that indicates validity: set to false when this varobj_root refers |
8756216b | 95 | to symbols that do not exist anymore. */ |
4c37490d | 96 | bool is_valid = true; |
8756216b | 97 | |
99ad9427 YQ |
98 | /* Language-related operations for this variable and its |
99 | children. */ | |
9e5b9d2b | 100 | const struct lang_varobj_ops *lang_ops = NULL; |
8b93c638 | 101 | |
581e13c1 | 102 | /* The varobj for this root node. */ |
9e5b9d2b | 103 | struct varobj *rootvar = NULL; |
72330bd6 | 104 | }; |
8b93c638 | 105 | |
bb5ce47a | 106 | /* Dynamic part of varobj. */ |
8b93c638 | 107 | |
bb5ce47a YQ |
108 | struct varobj_dynamic |
109 | { | |
b6313243 TT |
110 | /* Whether the children of this varobj were requested. This field is |
111 | used to decide if dynamic varobj should recompute their children. | |
112 | In the event that the frontend never asked for the children, we | |
113 | can avoid that. */ | |
bd046f64 | 114 | bool children_requested = false; |
b6313243 | 115 | |
0cc7d26f TT |
116 | /* The pretty-printer constructor. If NULL, then the default |
117 | pretty-printer will be looked up. If None, then no | |
118 | pretty-printer will be installed. */ | |
9e5b9d2b | 119 | PyObject *constructor = NULL; |
0cc7d26f | 120 | |
b6313243 TT |
121 | /* The pretty-printer that has been constructed. If NULL, then a |
122 | new printer object is needed, and one will be constructed. */ | |
9e5b9d2b | 123 | PyObject *pretty_printer = NULL; |
0cc7d26f TT |
124 | |
125 | /* The iterator returned by the printer's 'children' method, or NULL | |
126 | if not available. */ | |
24fd95b4 | 127 | std::unique_ptr<varobj_iter> child_iter; |
0cc7d26f TT |
128 | |
129 | /* We request one extra item from the iterator, so that we can | |
130 | report to the caller whether there are more items than we have | |
131 | already reported. However, we don't want to install this value | |
132 | when we read it, because that will mess up future updates. So, | |
133 | we stash it here instead. */ | |
74462664 | 134 | std::unique_ptr<varobj_item> saved_item; |
72330bd6 | 135 | }; |
8b93c638 | 136 | |
8b93c638 JM |
137 | /* Private function prototypes */ |
138 | ||
581e13c1 | 139 | /* Helper functions for the above subcommands. */ |
8b93c638 | 140 | |
4c37490d | 141 | static int delete_variable (struct varobj *, bool); |
8b93c638 | 142 | |
4c37490d | 143 | static void delete_variable_1 (int *, struct varobj *, bool, bool); |
8b93c638 | 144 | |
4c37490d | 145 | static bool install_variable (struct varobj *); |
8b93c638 | 146 | |
a14ed312 | 147 | static void uninstall_variable (struct varobj *); |
8b93c638 | 148 | |
2f408ecb | 149 | static struct varobj *create_child (struct varobj *, int, std::string &); |
8b93c638 | 150 | |
b6313243 | 151 | static struct varobj * |
5a2e0d6e YQ |
152 | create_child_with_value (struct varobj *parent, int index, |
153 | struct varobj_item *item); | |
b6313243 | 154 | |
8b93c638 JM |
155 | /* Utility routines */ |
156 | ||
a14ed312 | 157 | static enum varobj_display_formats variable_default_display (struct varobj *); |
8b93c638 | 158 | |
4c37490d SM |
159 | static bool update_type_if_necessary (struct varobj *var, |
160 | struct value *new_value); | |
8264ba82 | 161 | |
4c37490d SM |
162 | static bool install_new_value (struct varobj *var, struct value *value, |
163 | bool initial); | |
acd65feb | 164 | |
581e13c1 | 165 | /* Language-specific routines. */ |
8b93c638 | 166 | |
b09e2c59 | 167 | static int number_of_children (const struct varobj *); |
8b93c638 | 168 | |
2f408ecb | 169 | static std::string name_of_variable (const struct varobj *); |
8b93c638 | 170 | |
2f408ecb | 171 | static std::string name_of_child (struct varobj *, int); |
8b93c638 | 172 | |
4c37490d | 173 | static struct value *value_of_root (struct varobj **var_handle, bool *); |
8b93c638 | 174 | |
c1cc6152 | 175 | static struct value *value_of_child (const struct varobj *parent, int index); |
8b93c638 | 176 | |
2f408ecb PA |
177 | static std::string my_value_of_variable (struct varobj *var, |
178 | enum varobj_display_formats format); | |
8b93c638 | 179 | |
4c37490d | 180 | static bool is_root_p (const struct varobj *var); |
8b93c638 | 181 | |
9a1edae6 | 182 | static struct varobj *varobj_add_child (struct varobj *var, |
5a2e0d6e | 183 | struct varobj_item *item); |
b6313243 | 184 | |
8b93c638 JM |
185 | /* Private data */ |
186 | ||
581e13c1 | 187 | /* Mappings of varobj_display_formats enums to gdb's format codes. */ |
1c35a88f | 188 | static int format_code[] = { 0, 't', 'd', 'x', 'o', 'z' }; |
8b93c638 | 189 | |
76deb5d9 TT |
190 | /* List of root variable objects. */ |
191 | static std::list<struct varobj_root *> rootlist; | |
8b93c638 | 192 | |
581e13c1 | 193 | /* Pointer to the varobj hash table (built at run time). */ |
2c1413a9 | 194 | static htab_t varobj_table; |
8b93c638 | 195 | |
8b93c638 JM |
196 | \f |
197 | ||
198 | /* API Implementation */ | |
4c37490d | 199 | static bool |
b09e2c59 | 200 | is_root_p (const struct varobj *var) |
b2c2bd75 VP |
201 | { |
202 | return (var->root->rootvar == var); | |
203 | } | |
8b93c638 | 204 | |
d452c4bc | 205 | #ifdef HAVE_PYTHON |
6cd67bea TT |
206 | |
207 | /* See python-internal.h. */ | |
208 | gdbpy_enter_varobj::gdbpy_enter_varobj (const struct varobj *var) | |
209 | : gdbpy_enter (var->root->exp->gdbarch, var->root->exp->language_defn) | |
210 | { | |
211 | } | |
212 | ||
d452c4bc UW |
213 | #endif |
214 | ||
7d8547c9 AC |
215 | /* Return the full FRAME which corresponds to the given CORE_ADDR |
216 | or NULL if no FRAME on the chain corresponds to CORE_ADDR. */ | |
217 | ||
218 | static struct frame_info * | |
219 | find_frame_addr_in_frame_chain (CORE_ADDR frame_addr) | |
220 | { | |
221 | struct frame_info *frame = NULL; | |
222 | ||
223 | if (frame_addr == (CORE_ADDR) 0) | |
224 | return NULL; | |
225 | ||
9d49bdc2 PA |
226 | for (frame = get_current_frame (); |
227 | frame != NULL; | |
228 | frame = get_prev_frame (frame)) | |
7d8547c9 | 229 | { |
1fac167a UW |
230 | /* The CORE_ADDR we get as argument was parsed from a string GDB |
231 | output as $fp. This output got truncated to gdbarch_addr_bit. | |
232 | Truncate the frame base address in the same manner before | |
233 | comparing it against our argument. */ | |
234 | CORE_ADDR frame_base = get_frame_base_address (frame); | |
235 | int addr_bit = gdbarch_addr_bit (get_frame_arch (frame)); | |
a109c7c1 | 236 | |
1fac167a UW |
237 | if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)) |
238 | frame_base &= ((CORE_ADDR) 1 << addr_bit) - 1; | |
239 | ||
240 | if (frame_base == frame_addr) | |
7d8547c9 AC |
241 | return frame; |
242 | } | |
9d49bdc2 PA |
243 | |
244 | return NULL; | |
7d8547c9 AC |
245 | } |
246 | ||
5fa13070 SM |
247 | /* Creates a varobj (not its children). */ |
248 | ||
8b93c638 | 249 | struct varobj * |
2f408ecb PA |
250 | varobj_create (const char *objname, |
251 | const char *expression, CORE_ADDR frame, enum varobj_type type) | |
8b93c638 | 252 | { |
581e13c1 | 253 | /* Fill out a varobj structure for the (root) variable being constructed. */ |
9e5b9d2b | 254 | std::unique_ptr<varobj> var (new varobj (new varobj_root)); |
8b93c638 JM |
255 | |
256 | if (expression != NULL) | |
257 | { | |
e4195b40 | 258 | struct frame_info *fi; |
35633fef | 259 | struct frame_id old_id = null_frame_id; |
3977b71f | 260 | const struct block *block; |
bbc13ae3 | 261 | const char *p; |
e55dccf0 | 262 | struct value *value = NULL; |
1bb9788d | 263 | CORE_ADDR pc; |
8b93c638 | 264 | |
9d49bdc2 | 265 | /* Parse and evaluate the expression, filling in as much of the |
dda83cd7 | 266 | variable's data as possible. */ |
9d49bdc2 PA |
267 | |
268 | if (has_stack_frames ()) | |
269 | { | |
581e13c1 | 270 | /* Allow creator to specify context of variable. */ |
9d49bdc2 PA |
271 | if ((type == USE_CURRENT_FRAME) || (type == USE_SELECTED_FRAME)) |
272 | fi = get_selected_frame (NULL); | |
273 | else | |
274 | /* FIXME: cagney/2002-11-23: This code should be doing a | |
275 | lookup using the frame ID and not just the frame's | |
276 | ``address''. This, of course, means an interface | |
277 | change. However, with out that interface change ISAs, | |
278 | such as the ia64 with its two stacks, won't work. | |
279 | Similar goes for the case where there is a frameless | |
280 | function. */ | |
281 | fi = find_frame_addr_in_frame_chain (frame); | |
282 | } | |
8b93c638 | 283 | else |
9d49bdc2 | 284 | fi = NULL; |
8b93c638 | 285 | |
73a93a32 | 286 | if (type == USE_SELECTED_FRAME) |
4c37490d | 287 | var->root->floating = true; |
73a93a32 | 288 | |
1bb9788d | 289 | pc = 0; |
8b93c638 JM |
290 | block = NULL; |
291 | if (fi != NULL) | |
1bb9788d TT |
292 | { |
293 | block = get_frame_block (fi, 0); | |
294 | pc = get_frame_pc (fi); | |
295 | } | |
8b93c638 JM |
296 | |
297 | p = expression; | |
699bd4cf TT |
298 | |
299 | innermost_block_tracker tracker (INNERMOST_BLOCK_FOR_SYMBOLS | |
300 | | INNERMOST_BLOCK_FOR_REGISTERS); | |
73a93a32 | 301 | /* Wrap the call to parse expression, so we can |
dda83cd7 | 302 | return a sensible error. */ |
a70b8144 | 303 | try |
8e7b59a5 | 304 | { |
699bd4cf | 305 | var->root->exp = parse_exp_1 (&p, pc, block, 0, &tracker); |
8e7b59a5 KS |
306 | } |
307 | ||
230d2906 | 308 | catch (const gdb_exception_error &except) |
73a93a32 JI |
309 | { |
310 | return NULL; | |
311 | } | |
8b93c638 | 312 | |
581e13c1 | 313 | /* Don't allow variables to be created for types. */ |
608b4967 TT |
314 | if (var->root->exp->elts[0].opcode == OP_TYPE |
315 | || var->root->exp->elts[0].opcode == OP_TYPEOF | |
316 | || var->root->exp->elts[0].opcode == OP_DECLTYPE) | |
8b93c638 | 317 | { |
bc8332bb AC |
318 | fprintf_unfiltered (gdb_stderr, "Attempt to use a type name" |
319 | " as an expression.\n"); | |
8b93c638 JM |
320 | return NULL; |
321 | } | |
322 | ||
9e5b9d2b | 323 | var->format = variable_default_display (var.get ()); |
e707fc44 | 324 | var->root->valid_block = |
699bd4cf | 325 | var->root->floating ? NULL : tracker.block (); |
2f408ecb | 326 | var->name = expression; |
02142340 | 327 | /* For a root var, the name and the expr are the same. */ |
2f408ecb | 328 | var->path_expr = expression; |
8b93c638 JM |
329 | |
330 | /* When the frame is different from the current frame, | |
dda83cd7 SM |
331 | we must select the appropriate frame before parsing |
332 | the expression, otherwise the value will not be current. | |
333 | Since select_frame is so benign, just call it for all cases. */ | |
aee1fcdf | 334 | if (var->root->valid_block) |
8b93c638 | 335 | { |
4e22772d JK |
336 | /* User could specify explicit FRAME-ADDR which was not found but |
337 | EXPRESSION is frame specific and we would not be able to evaluate | |
338 | it correctly next time. With VALID_BLOCK set we must also set | |
339 | FRAME and THREAD_ID. */ | |
340 | if (fi == NULL) | |
341 | error (_("Failed to find the specified frame")); | |
342 | ||
7a424e99 | 343 | var->root->frame = get_frame_id (fi); |
00431a78 | 344 | var->root->thread_id = inferior_thread ()->global_num; |
35633fef | 345 | old_id = get_frame_id (get_selected_frame (NULL)); |
c5b48eac | 346 | select_frame (fi); |
8b93c638 JM |
347 | } |
348 | ||
340a7723 | 349 | /* We definitely need to catch errors here. |
dda83cd7 SM |
350 | If evaluate_expression succeeds we got the value we wanted. |
351 | But if it fails, we still go on with a call to evaluate_type(). */ | |
a70b8144 | 352 | try |
8e7b59a5 | 353 | { |
4d01a485 | 354 | value = evaluate_expression (var->root->exp.get ()); |
8e7b59a5 | 355 | } |
230d2906 | 356 | catch (const gdb_exception_error &except) |
e55dccf0 VP |
357 | { |
358 | /* Error getting the value. Try to at least get the | |
359 | right type. */ | |
4d01a485 | 360 | struct value *type_only_value = evaluate_type (var->root->exp.get ()); |
a109c7c1 | 361 | |
e55dccf0 VP |
362 | var->type = value_type (type_only_value); |
363 | } | |
8264ba82 | 364 | |
492d29ea PA |
365 | if (value != NULL) |
366 | { | |
367 | int real_type_found = 0; | |
368 | ||
369 | var->type = value_actual_type (value, 0, &real_type_found); | |
370 | if (real_type_found) | |
371 | value = value_cast (var->type, value); | |
372 | } | |
acd65feb | 373 | |
8b93c638 | 374 | /* Set language info */ |
b63a3f3f | 375 | var->root->lang_ops = var->root->exp->language_defn->varobj_ops (); |
8b93c638 | 376 | |
9e5b9d2b | 377 | install_new_value (var.get (), value, 1 /* Initial assignment */); |
d32cafc7 | 378 | |
581e13c1 | 379 | /* Set ourselves as our root. */ |
9e5b9d2b | 380 | var->root->rootvar = var.get (); |
8b93c638 | 381 | |
581e13c1 | 382 | /* Reset the selected frame. */ |
35633fef JK |
383 | if (frame_id_p (old_id)) |
384 | select_frame (frame_find_by_id (old_id)); | |
8b93c638 JM |
385 | } |
386 | ||
73a93a32 | 387 | /* If the variable object name is null, that means this |
581e13c1 | 388 | is a temporary variable, so don't install it. */ |
73a93a32 JI |
389 | |
390 | if ((var != NULL) && (objname != NULL)) | |
8b93c638 | 391 | { |
2f408ecb | 392 | var->obj_name = objname; |
8b93c638 JM |
393 | |
394 | /* If a varobj name is duplicated, the install will fail so | |
dda83cd7 | 395 | we must cleanup. */ |
9e5b9d2b SM |
396 | if (!install_variable (var.get ())) |
397 | return NULL; | |
8b93c638 JM |
398 | } |
399 | ||
9e5b9d2b | 400 | return var.release (); |
8b93c638 JM |
401 | } |
402 | ||
581e13c1 | 403 | /* Generates an unique name that can be used for a varobj. */ |
8b93c638 | 404 | |
2d6960b4 | 405 | std::string |
8b93c638 JM |
406 | varobj_gen_name (void) |
407 | { | |
408 | static int id = 0; | |
8b93c638 | 409 | |
581e13c1 | 410 | /* Generate a name for this object. */ |
8b93c638 | 411 | id++; |
2d6960b4 | 412 | return string_printf ("var%d", id); |
8b93c638 JM |
413 | } |
414 | ||
61d8f275 JK |
415 | /* Given an OBJNAME, returns the pointer to the corresponding varobj. Call |
416 | error if OBJNAME cannot be found. */ | |
8b93c638 JM |
417 | |
418 | struct varobj * | |
2f408ecb | 419 | varobj_get_handle (const char *objname) |
8b93c638 | 420 | { |
2c1413a9 TT |
421 | varobj *var = (varobj *) htab_find_with_hash (varobj_table, objname, |
422 | htab_hash_string (objname)); | |
8b93c638 | 423 | |
2c1413a9 | 424 | if (var == NULL) |
8a3fe4f8 | 425 | error (_("Variable object not found")); |
8b93c638 | 426 | |
2c1413a9 | 427 | return var; |
8b93c638 JM |
428 | } |
429 | ||
581e13c1 | 430 | /* Given the handle, return the name of the object. */ |
8b93c638 | 431 | |
2f408ecb | 432 | const char * |
b09e2c59 | 433 | varobj_get_objname (const struct varobj *var) |
8b93c638 | 434 | { |
2f408ecb | 435 | return var->obj_name.c_str (); |
8b93c638 JM |
436 | } |
437 | ||
2f408ecb PA |
438 | /* Given the handle, return the expression represented by the |
439 | object. */ | |
8b93c638 | 440 | |
2f408ecb | 441 | std::string |
b09e2c59 | 442 | varobj_get_expression (const struct varobj *var) |
8b93c638 JM |
443 | { |
444 | return name_of_variable (var); | |
445 | } | |
446 | ||
30914ca8 | 447 | /* See varobj.h. */ |
8b93c638 JM |
448 | |
449 | int | |
4c37490d | 450 | varobj_delete (struct varobj *var, bool only_children) |
8b93c638 | 451 | { |
30914ca8 | 452 | return delete_variable (var, only_children); |
8b93c638 JM |
453 | } |
454 | ||
d8b65138 JK |
455 | #if HAVE_PYTHON |
456 | ||
b6313243 TT |
457 | /* Convenience function for varobj_set_visualizer. Instantiate a |
458 | pretty-printer for a given value. */ | |
459 | static PyObject * | |
460 | instantiate_pretty_printer (PyObject *constructor, struct value *value) | |
461 | { | |
b6313243 TT |
462 | PyObject *val_obj = NULL; |
463 | PyObject *printer; | |
b6313243 | 464 | |
b6313243 | 465 | val_obj = value_to_value_object (value); |
b6313243 TT |
466 | if (! val_obj) |
467 | return NULL; | |
468 | ||
469 | printer = PyObject_CallFunctionObjArgs (constructor, val_obj, NULL); | |
470 | Py_DECREF (val_obj); | |
471 | return printer; | |
b6313243 TT |
472 | } |
473 | ||
d8b65138 JK |
474 | #endif |
475 | ||
581e13c1 | 476 | /* Set/Get variable object display format. */ |
8b93c638 JM |
477 | |
478 | enum varobj_display_formats | |
479 | varobj_set_display_format (struct varobj *var, | |
480 | enum varobj_display_formats format) | |
481 | { | |
482 | switch (format) | |
483 | { | |
484 | case FORMAT_NATURAL: | |
485 | case FORMAT_BINARY: | |
486 | case FORMAT_DECIMAL: | |
487 | case FORMAT_HEXADECIMAL: | |
488 | case FORMAT_OCTAL: | |
1c35a88f | 489 | case FORMAT_ZHEXADECIMAL: |
8b93c638 JM |
490 | var->format = format; |
491 | break; | |
492 | ||
493 | default: | |
494 | var->format = variable_default_display (var); | |
495 | } | |
496 | ||
ae7d22a6 | 497 | if (varobj_value_is_changeable_p (var) |
b4d61099 | 498 | && var->value != nullptr && !value_lazy (var->value.get ())) |
ae7d22a6 | 499 | { |
b4d61099 | 500 | var->print_value = varobj_value_get_print_value (var->value.get (), |
99ad9427 | 501 | var->format, var); |
ae7d22a6 VP |
502 | } |
503 | ||
8b93c638 JM |
504 | return var->format; |
505 | } | |
506 | ||
507 | enum varobj_display_formats | |
b09e2c59 | 508 | varobj_get_display_format (const struct varobj *var) |
8b93c638 JM |
509 | { |
510 | return var->format; | |
511 | } | |
512 | ||
9b972014 | 513 | gdb::unique_xmalloc_ptr<char> |
b09e2c59 | 514 | varobj_get_display_hint (const struct varobj *var) |
b6313243 | 515 | { |
9b972014 | 516 | gdb::unique_xmalloc_ptr<char> result; |
b6313243 TT |
517 | |
518 | #if HAVE_PYTHON | |
0646da15 TT |
519 | if (!gdb_python_initialized) |
520 | return NULL; | |
521 | ||
bde7b3e3 | 522 | gdbpy_enter_varobj enter_py (var); |
d452c4bc | 523 | |
bb5ce47a YQ |
524 | if (var->dynamic->pretty_printer != NULL) |
525 | result = gdbpy_get_display_hint (var->dynamic->pretty_printer); | |
b6313243 TT |
526 | #endif |
527 | ||
528 | return result; | |
529 | } | |
530 | ||
0cc7d26f TT |
531 | /* Return true if the varobj has items after TO, false otherwise. */ |
532 | ||
4c37490d | 533 | bool |
b09e2c59 | 534 | varobj_has_more (const struct varobj *var, int to) |
0cc7d26f | 535 | { |
ddf0ea08 | 536 | if (var->children.size () > to) |
4c37490d | 537 | return true; |
ddf0ea08 SM |
538 | |
539 | return ((to == -1 || var->children.size () == to) | |
bb5ce47a | 540 | && (var->dynamic->saved_item != NULL)); |
0cc7d26f TT |
541 | } |
542 | ||
c5b48eac VP |
543 | /* If the variable object is bound to a specific thread, that |
544 | is its evaluation can always be done in context of a frame | |
545 | inside that thread, returns GDB id of the thread -- which | |
581e13c1 | 546 | is always positive. Otherwise, returns -1. */ |
c5b48eac | 547 | int |
b09e2c59 | 548 | varobj_get_thread_id (const struct varobj *var) |
c5b48eac VP |
549 | { |
550 | if (var->root->valid_block && var->root->thread_id > 0) | |
551 | return var->root->thread_id; | |
552 | else | |
553 | return -1; | |
554 | } | |
555 | ||
25d5ea92 | 556 | void |
4c37490d | 557 | varobj_set_frozen (struct varobj *var, bool frozen) |
25d5ea92 VP |
558 | { |
559 | /* When a variable is unfrozen, we don't fetch its value. | |
560 | The 'not_fetched' flag remains set, so next -var-update | |
561 | won't complain. | |
562 | ||
563 | We don't fetch the value, because for structures the client | |
564 | should do -var-update anyway. It would be bad to have different | |
565 | client-size logic for structure and other types. */ | |
566 | var->frozen = frozen; | |
567 | } | |
568 | ||
4c37490d | 569 | bool |
b09e2c59 | 570 | varobj_get_frozen (const struct varobj *var) |
25d5ea92 VP |
571 | { |
572 | return var->frozen; | |
573 | } | |
574 | ||
791b7405 AB |
575 | /* A helper function that updates the contents of FROM and TO based on the |
576 | size of the vector CHILDREN. If the contents of either FROM or TO are | |
577 | negative the entire range is used. */ | |
0cc7d26f | 578 | |
99ad9427 | 579 | void |
ddf0ea08 SM |
580 | varobj_restrict_range (const std::vector<varobj *> &children, |
581 | int *from, int *to) | |
0cc7d26f | 582 | { |
ddf0ea08 SM |
583 | int len = children.size (); |
584 | ||
0cc7d26f TT |
585 | if (*from < 0 || *to < 0) |
586 | { | |
587 | *from = 0; | |
ddf0ea08 | 588 | *to = len; |
0cc7d26f TT |
589 | } |
590 | else | |
591 | { | |
ddf0ea08 SM |
592 | if (*from > len) |
593 | *from = len; | |
594 | if (*to > len) | |
595 | *to = len; | |
0cc7d26f TT |
596 | if (*from > *to) |
597 | *from = *to; | |
598 | } | |
599 | } | |
600 | ||
601 | /* A helper for update_dynamic_varobj_children that installs a new | |
602 | child when needed. */ | |
603 | ||
604 | static void | |
605 | install_dynamic_child (struct varobj *var, | |
0604393c SM |
606 | std::vector<varobj *> *changed, |
607 | std::vector<varobj *> *type_changed, | |
608 | std::vector<varobj *> *newobj, | |
609 | std::vector<varobj *> *unchanged, | |
4c37490d | 610 | bool *cchanged, |
0cc7d26f | 611 | int index, |
5a2e0d6e | 612 | struct varobj_item *item) |
0cc7d26f | 613 | { |
ddf0ea08 | 614 | if (var->children.size () < index + 1) |
0cc7d26f TT |
615 | { |
616 | /* There's no child yet. */ | |
5a2e0d6e | 617 | struct varobj *child = varobj_add_child (var, item); |
a109c7c1 | 618 | |
0604393c | 619 | if (newobj != NULL) |
0cc7d26f | 620 | { |
0604393c | 621 | newobj->push_back (child); |
4c37490d | 622 | *cchanged = true; |
0cc7d26f TT |
623 | } |
624 | } | |
bf8793bb | 625 | else |
0cc7d26f | 626 | { |
ddf0ea08 | 627 | varobj *existing = var->children[index]; |
11106495 TT |
628 | bool type_updated = update_type_if_necessary (existing, |
629 | item->value.get ()); | |
bf8793bb | 630 | |
8264ba82 AG |
631 | if (type_updated) |
632 | { | |
0604393c SM |
633 | if (type_changed != NULL) |
634 | type_changed->push_back (existing); | |
8264ba82 | 635 | } |
11106495 | 636 | if (install_new_value (existing, item->value.get (), 0)) |
0cc7d26f | 637 | { |
0604393c SM |
638 | if (!type_updated && changed != NULL) |
639 | changed->push_back (existing); | |
0cc7d26f | 640 | } |
0604393c SM |
641 | else if (!type_updated && unchanged != NULL) |
642 | unchanged->push_back (existing); | |
0cc7d26f TT |
643 | } |
644 | } | |
645 | ||
576ea091 YQ |
646 | #if HAVE_PYTHON |
647 | ||
4c37490d | 648 | static bool |
b09e2c59 | 649 | dynamic_varobj_has_child_method (const struct varobj *var) |
0cc7d26f | 650 | { |
bb5ce47a | 651 | PyObject *printer = var->dynamic->pretty_printer; |
0cc7d26f | 652 | |
0646da15 | 653 | if (!gdb_python_initialized) |
4c37490d | 654 | return false; |
0646da15 | 655 | |
bde7b3e3 TT |
656 | gdbpy_enter_varobj enter_py (var); |
657 | return PyObject_HasAttr (printer, gdbpy_children_cst); | |
0cc7d26f | 658 | } |
576ea091 | 659 | #endif |
0cc7d26f | 660 | |
e5250216 YQ |
661 | /* A factory for creating dynamic varobj's iterators. Returns an |
662 | iterator object suitable for iterating over VAR's children. */ | |
663 | ||
24fd95b4 | 664 | static std::unique_ptr<varobj_iter> |
e5250216 YQ |
665 | varobj_get_iterator (struct varobj *var) |
666 | { | |
576ea091 | 667 | #if HAVE_PYTHON |
e5250216 YQ |
668 | if (var->dynamic->pretty_printer) |
669 | return py_varobj_get_iterator (var, var->dynamic->pretty_printer); | |
576ea091 | 670 | #endif |
e5250216 YQ |
671 | |
672 | gdb_assert_not_reached (_("\ | |
673 | requested an iterator from a non-dynamic varobj")); | |
674 | } | |
675 | ||
4c37490d | 676 | static bool |
b6313243 | 677 | update_dynamic_varobj_children (struct varobj *var, |
0604393c SM |
678 | std::vector<varobj *> *changed, |
679 | std::vector<varobj *> *type_changed, | |
680 | std::vector<varobj *> *newobj, | |
681 | std::vector<varobj *> *unchanged, | |
4c37490d SM |
682 | bool *cchanged, |
683 | bool update_children, | |
0cc7d26f TT |
684 | int from, |
685 | int to) | |
b6313243 | 686 | { |
b6313243 | 687 | int i; |
b6313243 | 688 | |
4c37490d | 689 | *cchanged = false; |
b6313243 | 690 | |
bb5ce47a | 691 | if (update_children || var->dynamic->child_iter == NULL) |
b6313243 | 692 | { |
e5250216 | 693 | var->dynamic->child_iter = varobj_get_iterator (var); |
446d2c03 | 694 | var->dynamic->saved_item.reset (nullptr); |
b6313243 | 695 | |
e5250216 | 696 | i = 0; |
b6313243 | 697 | |
bb5ce47a | 698 | if (var->dynamic->child_iter == NULL) |
4c37490d | 699 | return false; |
b6313243 | 700 | } |
0cc7d26f | 701 | else |
ddf0ea08 | 702 | i = var->children.size (); |
b6313243 | 703 | |
0cc7d26f TT |
704 | /* We ask for one extra child, so that MI can report whether there |
705 | are more children. */ | |
706 | for (; to < 0 || i < to + 1; ++i) | |
b6313243 | 707 | { |
60ee72f6 | 708 | std::unique_ptr<varobj_item> item; |
b6313243 | 709 | |
0cc7d26f | 710 | /* See if there was a leftover from last time. */ |
827f100c | 711 | if (var->dynamic->saved_item != NULL) |
74462664 | 712 | item = std::move (var->dynamic->saved_item); |
0cc7d26f | 713 | else |
11106495 | 714 | item = var->dynamic->child_iter->next (); |
b6313243 | 715 | |
e5250216 YQ |
716 | if (item == NULL) |
717 | { | |
718 | /* Iteration is done. Remove iterator from VAR. */ | |
24fd95b4 | 719 | var->dynamic->child_iter.reset (nullptr); |
e5250216 YQ |
720 | break; |
721 | } | |
0cc7d26f TT |
722 | /* We don't want to push the extra child on any report list. */ |
723 | if (to < 0 || i < to) | |
b6313243 | 724 | { |
4c37490d | 725 | bool can_mention = from < 0 || i >= from; |
0cc7d26f | 726 | |
0cc7d26f | 727 | install_dynamic_child (var, can_mention ? changed : NULL, |
8264ba82 | 728 | can_mention ? type_changed : NULL, |
fe978cb0 | 729 | can_mention ? newobj : NULL, |
0cc7d26f | 730 | can_mention ? unchanged : NULL, |
5e5ac9a5 | 731 | can_mention ? cchanged : NULL, i, |
60ee72f6 | 732 | item.get ()); |
b6313243 | 733 | } |
0cc7d26f | 734 | else |
b6313243 | 735 | { |
74462664 | 736 | var->dynamic->saved_item = std::move (item); |
b6313243 | 737 | |
0cc7d26f TT |
738 | /* We want to truncate the child list just before this |
739 | element. */ | |
740 | break; | |
741 | } | |
b6313243 TT |
742 | } |
743 | ||
ddf0ea08 | 744 | if (i < var->children.size ()) |
b6313243 | 745 | { |
4c37490d | 746 | *cchanged = true; |
ddf0ea08 SM |
747 | for (int j = i; j < var->children.size (); ++j) |
748 | varobj_delete (var->children[j], 0); | |
749 | ||
750 | var->children.resize (i); | |
b6313243 | 751 | } |
0cc7d26f TT |
752 | |
753 | /* If there are fewer children than requested, note that the list of | |
754 | children changed. */ | |
ddf0ea08 | 755 | if (to >= 0 && var->children.size () < to) |
4c37490d | 756 | *cchanged = true; |
0cc7d26f | 757 | |
ddf0ea08 | 758 | var->num_children = var->children.size (); |
b6313243 | 759 | |
4c37490d | 760 | return true; |
b6313243 | 761 | } |
25d5ea92 | 762 | |
8b93c638 JM |
763 | int |
764 | varobj_get_num_children (struct varobj *var) | |
765 | { | |
766 | if (var->num_children == -1) | |
b6313243 | 767 | { |
31f628ae | 768 | if (varobj_is_dynamic_p (var)) |
0cc7d26f | 769 | { |
4c37490d | 770 | bool dummy; |
0cc7d26f TT |
771 | |
772 | /* If we have a dynamic varobj, don't report -1 children. | |
773 | So, try to fetch some children first. */ | |
8264ba82 | 774 | update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, &dummy, |
4c37490d | 775 | false, 0, 0); |
0cc7d26f TT |
776 | } |
777 | else | |
b6313243 TT |
778 | var->num_children = number_of_children (var); |
779 | } | |
8b93c638 | 780 | |
0cc7d26f | 781 | return var->num_children >= 0 ? var->num_children : 0; |
8b93c638 JM |
782 | } |
783 | ||
784 | /* Creates a list of the immediate children of a variable object; | |
581e13c1 | 785 | the return code is the number of such children or -1 on error. */ |
8b93c638 | 786 | |
ddf0ea08 | 787 | const std::vector<varobj *> & |
0cc7d26f | 788 | varobj_list_children (struct varobj *var, int *from, int *to) |
8b93c638 | 789 | { |
bd046f64 | 790 | var->dynamic->children_requested = true; |
b6313243 | 791 | |
31f628ae | 792 | if (varobj_is_dynamic_p (var)) |
0cc7d26f | 793 | { |
4c37490d SM |
794 | bool children_changed; |
795 | ||
b6313243 TT |
796 | /* This, in theory, can result in the number of children changing without |
797 | frontend noticing. But well, calling -var-list-children on the same | |
798 | varobj twice is not something a sane frontend would do. */ | |
8264ba82 | 799 | update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, |
4c37490d | 800 | &children_changed, false, 0, *to); |
99ad9427 | 801 | varobj_restrict_range (var->children, from, to); |
0cc7d26f TT |
802 | return var->children; |
803 | } | |
8b93c638 | 804 | |
8b93c638 JM |
805 | if (var->num_children == -1) |
806 | var->num_children = number_of_children (var); | |
807 | ||
74a44383 DJ |
808 | /* If that failed, give up. */ |
809 | if (var->num_children == -1) | |
d56d46f5 | 810 | return var->children; |
74a44383 | 811 | |
28335dcc VP |
812 | /* If we're called when the list of children is not yet initialized, |
813 | allocate enough elements in it. */ | |
ddf0ea08 SM |
814 | while (var->children.size () < var->num_children) |
815 | var->children.push_back (NULL); | |
28335dcc | 816 | |
ddf0ea08 | 817 | for (int i = 0; i < var->num_children; i++) |
8b93c638 | 818 | { |
ddf0ea08 | 819 | if (var->children[i] == NULL) |
28335dcc VP |
820 | { |
821 | /* Either it's the first call to varobj_list_children for | |
822 | this variable object, and the child was never created, | |
823 | or it was explicitly deleted by the client. */ | |
2f408ecb | 824 | std::string name = name_of_child (var, i); |
ddf0ea08 | 825 | var->children[i] = create_child (var, i, name); |
28335dcc | 826 | } |
8b93c638 JM |
827 | } |
828 | ||
99ad9427 | 829 | varobj_restrict_range (var->children, from, to); |
d56d46f5 | 830 | return var->children; |
8b93c638 JM |
831 | } |
832 | ||
b6313243 | 833 | static struct varobj * |
5a2e0d6e | 834 | varobj_add_child (struct varobj *var, struct varobj_item *item) |
b6313243 | 835 | { |
ddf0ea08 SM |
836 | varobj *v = create_child_with_value (var, var->children.size (), item); |
837 | ||
838 | var->children.push_back (v); | |
a109c7c1 | 839 | |
b6313243 TT |
840 | return v; |
841 | } | |
842 | ||
8b93c638 | 843 | /* Obtain the type of an object Variable as a string similar to the one gdb |
afa269ae SM |
844 | prints on the console. The caller is responsible for freeing the string. |
845 | */ | |
8b93c638 | 846 | |
2f408ecb | 847 | std::string |
8b93c638 JM |
848 | varobj_get_type (struct varobj *var) |
849 | { | |
8ab91b96 | 850 | /* For the "fake" variables, do not return a type. (Its type is |
8756216b DP |
851 | NULL, too.) |
852 | Do not return a type for invalid variables as well. */ | |
853 | if (CPLUS_FAKE_CHILD (var) || !var->root->is_valid) | |
2f408ecb | 854 | return std::string (); |
8b93c638 | 855 | |
1a4300e9 | 856 | return type_to_string (var->type); |
8b93c638 JM |
857 | } |
858 | ||
1ecb4ee0 DJ |
859 | /* Obtain the type of an object variable. */ |
860 | ||
861 | struct type * | |
b09e2c59 | 862 | varobj_get_gdb_type (const struct varobj *var) |
1ecb4ee0 DJ |
863 | { |
864 | return var->type; | |
865 | } | |
866 | ||
85254831 KS |
867 | /* Is VAR a path expression parent, i.e., can it be used to construct |
868 | a valid path expression? */ | |
869 | ||
4c37490d | 870 | static bool |
b09e2c59 | 871 | is_path_expr_parent (const struct varobj *var) |
85254831 | 872 | { |
9a9a7608 AB |
873 | gdb_assert (var->root->lang_ops->is_path_expr_parent != NULL); |
874 | return var->root->lang_ops->is_path_expr_parent (var); | |
875 | } | |
85254831 | 876 | |
9a9a7608 AB |
877 | /* Is VAR a path expression parent, i.e., can it be used to construct |
878 | a valid path expression? By default we assume any VAR can be a path | |
879 | parent. */ | |
85254831 | 880 | |
4c37490d | 881 | bool |
b09e2c59 | 882 | varobj_default_is_path_expr_parent (const struct varobj *var) |
9a9a7608 | 883 | { |
4c37490d | 884 | return true; |
85254831 KS |
885 | } |
886 | ||
887 | /* Return the path expression parent for VAR. */ | |
888 | ||
c1cc6152 SM |
889 | const struct varobj * |
890 | varobj_get_path_expr_parent (const struct varobj *var) | |
85254831 | 891 | { |
c1cc6152 | 892 | const struct varobj *parent = var; |
85254831 KS |
893 | |
894 | while (!is_root_p (parent) && !is_path_expr_parent (parent)) | |
895 | parent = parent->parent; | |
896 | ||
5abe0f0c JV |
897 | /* Computation of full rooted expression for children of dynamic |
898 | varobjs is not supported. */ | |
899 | if (varobj_is_dynamic_p (parent)) | |
900 | error (_("Invalid variable object (child of a dynamic varobj)")); | |
901 | ||
85254831 KS |
902 | return parent; |
903 | } | |
904 | ||
02142340 VP |
905 | /* Return a pointer to the full rooted expression of varobj VAR. |
906 | If it has not been computed yet, compute it. */ | |
2f408ecb PA |
907 | |
908 | const char * | |
c1cc6152 | 909 | varobj_get_path_expr (const struct varobj *var) |
02142340 | 910 | { |
2f408ecb | 911 | if (var->path_expr.empty ()) |
02142340 VP |
912 | { |
913 | /* For root varobjs, we initialize path_expr | |
914 | when creating varobj, so here it should be | |
915 | child varobj. */ | |
c1cc6152 | 916 | struct varobj *mutable_var = (struct varobj *) var; |
02142340 | 917 | gdb_assert (!is_root_p (var)); |
2568868e | 918 | |
c1cc6152 | 919 | mutable_var->path_expr = (*var->root->lang_ops->path_expr_of_child) (var); |
02142340 | 920 | } |
2568868e | 921 | |
2f408ecb | 922 | return var->path_expr.c_str (); |
02142340 VP |
923 | } |
924 | ||
fa4d0c40 | 925 | const struct language_defn * |
b09e2c59 | 926 | varobj_get_language (const struct varobj *var) |
8b93c638 | 927 | { |
fa4d0c40 | 928 | return var->root->exp->language_defn; |
8b93c638 JM |
929 | } |
930 | ||
931 | int | |
b09e2c59 | 932 | varobj_get_attributes (const struct varobj *var) |
8b93c638 JM |
933 | { |
934 | int attributes = 0; | |
935 | ||
340a7723 | 936 | if (varobj_editable_p (var)) |
581e13c1 | 937 | /* FIXME: define masks for attributes. */ |
8b93c638 JM |
938 | attributes |= 0x00000001; /* Editable */ |
939 | ||
940 | return attributes; | |
941 | } | |
942 | ||
cde5ef40 YQ |
943 | /* Return true if VAR is a dynamic varobj. */ |
944 | ||
4c37490d | 945 | bool |
b09e2c59 | 946 | varobj_is_dynamic_p (const struct varobj *var) |
0cc7d26f | 947 | { |
bb5ce47a | 948 | return var->dynamic->pretty_printer != NULL; |
0cc7d26f TT |
949 | } |
950 | ||
2f408ecb | 951 | std::string |
de051565 MK |
952 | varobj_get_formatted_value (struct varobj *var, |
953 | enum varobj_display_formats format) | |
954 | { | |
955 | return my_value_of_variable (var, format); | |
956 | } | |
957 | ||
2f408ecb | 958 | std::string |
8b93c638 JM |
959 | varobj_get_value (struct varobj *var) |
960 | { | |
de051565 | 961 | return my_value_of_variable (var, var->format); |
8b93c638 JM |
962 | } |
963 | ||
964 | /* Set the value of an object variable (if it is editable) to the | |
581e13c1 MS |
965 | value of the given expression. */ |
966 | /* Note: Invokes functions that can call error(). */ | |
8b93c638 | 967 | |
4c37490d | 968 | bool |
2f408ecb | 969 | varobj_set_value (struct varobj *var, const char *expression) |
8b93c638 | 970 | { |
34365054 | 971 | struct value *val = NULL; /* Initialize to keep gcc happy. */ |
8b93c638 | 972 | /* The argument "expression" contains the variable's new value. |
581e13c1 MS |
973 | We need to first construct a legal expression for this -- ugh! */ |
974 | /* Does this cover all the bases? */ | |
34365054 | 975 | struct value *value = NULL; /* Initialize to keep gcc happy. */ |
8b93c638 | 976 | int saved_input_radix = input_radix; |
bbc13ae3 | 977 | const char *s = expression; |
8b93c638 | 978 | |
340a7723 | 979 | gdb_assert (varobj_editable_p (var)); |
8b93c638 | 980 | |
581e13c1 | 981 | input_radix = 10; /* ALWAYS reset to decimal temporarily. */ |
4d01a485 | 982 | expression_up exp = parse_exp_1 (&s, 0, 0, 0); |
a70b8144 | 983 | try |
8e7b59a5 | 984 | { |
4d01a485 | 985 | value = evaluate_expression (exp.get ()); |
8e7b59a5 KS |
986 | } |
987 | ||
230d2906 | 988 | catch (const gdb_exception_error &except) |
340a7723 | 989 | { |
581e13c1 | 990 | /* We cannot proceed without a valid expression. */ |
4c37490d | 991 | return false; |
8b93c638 JM |
992 | } |
993 | ||
340a7723 NR |
994 | /* All types that are editable must also be changeable. */ |
995 | gdb_assert (varobj_value_is_changeable_p (var)); | |
996 | ||
997 | /* The value of a changeable variable object must not be lazy. */ | |
b4d61099 | 998 | gdb_assert (!value_lazy (var->value.get ())); |
340a7723 NR |
999 | |
1000 | /* Need to coerce the input. We want to check if the | |
1001 | value of the variable object will be different | |
1002 | after assignment, and the first thing value_assign | |
1003 | does is coerce the input. | |
1004 | For example, if we are assigning an array to a pointer variable we | |
b021a221 | 1005 | should compare the pointer with the array's address, not with the |
340a7723 NR |
1006 | array's content. */ |
1007 | value = coerce_array (value); | |
1008 | ||
8e7b59a5 KS |
1009 | /* The new value may be lazy. value_assign, or |
1010 | rather value_contents, will take care of this. */ | |
a70b8144 | 1011 | try |
8e7b59a5 | 1012 | { |
b4d61099 | 1013 | val = value_assign (var->value.get (), value); |
8e7b59a5 KS |
1014 | } |
1015 | ||
230d2906 | 1016 | catch (const gdb_exception_error &except) |
492d29ea | 1017 | { |
4c37490d | 1018 | return false; |
492d29ea | 1019 | } |
8e7b59a5 | 1020 | |
340a7723 NR |
1021 | /* If the value has changed, record it, so that next -var-update can |
1022 | report this change. If a variable had a value of '1', we've set it | |
1023 | to '333' and then set again to '1', when -var-update will report this | |
1024 | variable as changed -- because the first assignment has set the | |
1025 | 'updated' flag. There's no need to optimize that, because return value | |
1026 | of -var-update should be considered an approximation. */ | |
4c37490d | 1027 | var->updated = install_new_value (var, val, false /* Compare values. */); |
340a7723 | 1028 | input_radix = saved_input_radix; |
4c37490d | 1029 | return true; |
8b93c638 JM |
1030 | } |
1031 | ||
0cc7d26f TT |
1032 | #if HAVE_PYTHON |
1033 | ||
1034 | /* A helper function to install a constructor function and visualizer | |
bb5ce47a | 1035 | in a varobj_dynamic. */ |
0cc7d26f TT |
1036 | |
1037 | static void | |
bb5ce47a | 1038 | install_visualizer (struct varobj_dynamic *var, PyObject *constructor, |
0cc7d26f TT |
1039 | PyObject *visualizer) |
1040 | { | |
1041 | Py_XDECREF (var->constructor); | |
1042 | var->constructor = constructor; | |
1043 | ||
1044 | Py_XDECREF (var->pretty_printer); | |
1045 | var->pretty_printer = visualizer; | |
1046 | ||
24fd95b4 | 1047 | var->child_iter.reset (nullptr); |
0cc7d26f TT |
1048 | } |
1049 | ||
1050 | /* Install the default visualizer for VAR. */ | |
1051 | ||
1052 | static void | |
1053 | install_default_visualizer (struct varobj *var) | |
1054 | { | |
d65aec65 PM |
1055 | /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
1056 | if (CPLUS_FAKE_CHILD (var)) | |
1057 | return; | |
1058 | ||
0cc7d26f TT |
1059 | if (pretty_printing) |
1060 | { | |
a31abe80 | 1061 | gdbpy_ref<> pretty_printer; |
0cc7d26f | 1062 | |
b4d61099 | 1063 | if (var->value != nullptr) |
0cc7d26f | 1064 | { |
b4d61099 | 1065 | pretty_printer = gdbpy_get_varobj_pretty_printer (var->value.get ()); |
a31abe80 | 1066 | if (pretty_printer == nullptr) |
0cc7d26f TT |
1067 | { |
1068 | gdbpy_print_stack (); | |
1069 | error (_("Cannot instantiate printer for default visualizer")); | |
1070 | } | |
1071 | } | |
a31abe80 | 1072 | |
0cc7d26f | 1073 | if (pretty_printer == Py_None) |
895dafa6 | 1074 | pretty_printer.reset (nullptr); |
0cc7d26f | 1075 | |
a31abe80 | 1076 | install_visualizer (var->dynamic, NULL, pretty_printer.release ()); |
0cc7d26f TT |
1077 | } |
1078 | } | |
1079 | ||
1080 | /* Instantiate and install a visualizer for VAR using CONSTRUCTOR to | |
1081 | make a new object. */ | |
1082 | ||
1083 | static void | |
1084 | construct_visualizer (struct varobj *var, PyObject *constructor) | |
1085 | { | |
1086 | PyObject *pretty_printer; | |
1087 | ||
d65aec65 PM |
1088 | /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
1089 | if (CPLUS_FAKE_CHILD (var)) | |
1090 | return; | |
1091 | ||
0cc7d26f TT |
1092 | Py_INCREF (constructor); |
1093 | if (constructor == Py_None) | |
1094 | pretty_printer = NULL; | |
1095 | else | |
1096 | { | |
b4d61099 TT |
1097 | pretty_printer = instantiate_pretty_printer (constructor, |
1098 | var->value.get ()); | |
0cc7d26f TT |
1099 | if (! pretty_printer) |
1100 | { | |
1101 | gdbpy_print_stack (); | |
1102 | Py_DECREF (constructor); | |
1103 | constructor = Py_None; | |
1104 | Py_INCREF (constructor); | |
1105 | } | |
1106 | ||
1107 | if (pretty_printer == Py_None) | |
1108 | { | |
1109 | Py_DECREF (pretty_printer); | |
1110 | pretty_printer = NULL; | |
1111 | } | |
1112 | } | |
1113 | ||
bb5ce47a | 1114 | install_visualizer (var->dynamic, constructor, pretty_printer); |
0cc7d26f TT |
1115 | } |
1116 | ||
1117 | #endif /* HAVE_PYTHON */ | |
1118 | ||
1119 | /* A helper function for install_new_value. This creates and installs | |
1120 | a visualizer for VAR, if appropriate. */ | |
1121 | ||
1122 | static void | |
1123 | install_new_value_visualizer (struct varobj *var) | |
1124 | { | |
1125 | #if HAVE_PYTHON | |
1126 | /* If the constructor is None, then we want the raw value. If VAR | |
1127 | does not have a value, just skip this. */ | |
0646da15 TT |
1128 | if (!gdb_python_initialized) |
1129 | return; | |
1130 | ||
bb5ce47a | 1131 | if (var->dynamic->constructor != Py_None && var->value != NULL) |
0cc7d26f | 1132 | { |
bde7b3e3 | 1133 | gdbpy_enter_varobj enter_py (var); |
0cc7d26f | 1134 | |
bb5ce47a | 1135 | if (var->dynamic->constructor == NULL) |
0cc7d26f TT |
1136 | install_default_visualizer (var); |
1137 | else | |
bb5ce47a | 1138 | construct_visualizer (var, var->dynamic->constructor); |
0cc7d26f TT |
1139 | } |
1140 | #else | |
1141 | /* Do nothing. */ | |
1142 | #endif | |
1143 | } | |
1144 | ||
8264ba82 AG |
1145 | /* When using RTTI to determine variable type it may be changed in runtime when |
1146 | the variable value is changed. This function checks whether type of varobj | |
1147 | VAR will change when a new value NEW_VALUE is assigned and if it is so | |
1148 | updates the type of VAR. */ | |
1149 | ||
4c37490d | 1150 | static bool |
8264ba82 AG |
1151 | update_type_if_necessary (struct varobj *var, struct value *new_value) |
1152 | { | |
1153 | if (new_value) | |
1154 | { | |
1155 | struct value_print_options opts; | |
1156 | ||
1157 | get_user_print_options (&opts); | |
1158 | if (opts.objectprint) | |
1159 | { | |
2f408ecb PA |
1160 | struct type *new_type = value_actual_type (new_value, 0, 0); |
1161 | std::string new_type_str = type_to_string (new_type); | |
1162 | std::string curr_type_str = varobj_get_type (var); | |
8264ba82 | 1163 | |
2f408ecb PA |
1164 | /* Did the type name change? */ |
1165 | if (curr_type_str != new_type_str) | |
8264ba82 AG |
1166 | { |
1167 | var->type = new_type; | |
1168 | ||
1169 | /* This information may be not valid for a new type. */ | |
30914ca8 | 1170 | varobj_delete (var, 1); |
ddf0ea08 | 1171 | var->children.clear (); |
8264ba82 | 1172 | var->num_children = -1; |
4c37490d | 1173 | return true; |
8264ba82 AG |
1174 | } |
1175 | } | |
1176 | } | |
1177 | ||
4c37490d | 1178 | return false; |
8264ba82 AG |
1179 | } |
1180 | ||
4c37490d SM |
1181 | /* Assign a new value to a variable object. If INITIAL is true, |
1182 | this is the first assignment after the variable object was just | |
acd65feb | 1183 | created, or changed type. In that case, just assign the value |
4c37490d SM |
1184 | and return false. |
1185 | Otherwise, assign the new value, and return true if the value is | |
1186 | different from the current one, false otherwise. The comparison is | |
581e13c1 MS |
1187 | done on textual representation of value. Therefore, some types |
1188 | need not be compared. E.g. for structures the reported value is | |
1189 | always "{...}", so no comparison is necessary here. If the old | |
4c37490d | 1190 | value was NULL and new one is not, or vice versa, we always return true. |
b26ed50d VP |
1191 | |
1192 | The VALUE parameter should not be released -- the function will | |
1193 | take care of releasing it when needed. */ | |
4c37490d SM |
1194 | static bool |
1195 | install_new_value (struct varobj *var, struct value *value, bool initial) | |
acd65feb | 1196 | { |
4c37490d SM |
1197 | bool changeable; |
1198 | bool need_to_fetch; | |
1199 | bool changed = false; | |
1200 | bool intentionally_not_fetched = false; | |
acd65feb | 1201 | |
acd65feb | 1202 | /* We need to know the varobj's type to decide if the value should |
3e43a32a | 1203 | be fetched or not. C++ fake children (public/protected/private) |
581e13c1 | 1204 | don't have a type. */ |
acd65feb | 1205 | gdb_assert (var->type || CPLUS_FAKE_CHILD (var)); |
b2c2bd75 | 1206 | changeable = varobj_value_is_changeable_p (var); |
b6313243 TT |
1207 | |
1208 | /* If the type has custom visualizer, we consider it to be always | |
581e13c1 | 1209 | changeable. FIXME: need to make sure this behaviour will not |
b6313243 | 1210 | mess up read-sensitive values. */ |
bb5ce47a | 1211 | if (var->dynamic->pretty_printer != NULL) |
4c37490d | 1212 | changeable = true; |
b6313243 | 1213 | |
acd65feb VP |
1214 | need_to_fetch = changeable; |
1215 | ||
b26ed50d VP |
1216 | /* We are not interested in the address of references, and given |
1217 | that in C++ a reference is not rebindable, it cannot | |
1218 | meaningfully change. So, get hold of the real value. */ | |
1219 | if (value) | |
0cc7d26f | 1220 | value = coerce_ref (value); |
b26ed50d | 1221 | |
78134374 | 1222 | if (var->type && var->type->code () == TYPE_CODE_UNION) |
acd65feb VP |
1223 | /* For unions, we need to fetch the value implicitly because |
1224 | of implementation of union member fetch. When gdb | |
1225 | creates a value for a field and the value of the enclosing | |
1226 | structure is not lazy, it immediately copies the necessary | |
1227 | bytes from the enclosing values. If the enclosing value is | |
1228 | lazy, the call to value_fetch_lazy on the field will read | |
1229 | the data from memory. For unions, that means we'll read the | |
1230 | same memory more than once, which is not desirable. So | |
1231 | fetch now. */ | |
4c37490d | 1232 | need_to_fetch = true; |
acd65feb VP |
1233 | |
1234 | /* The new value might be lazy. If the type is changeable, | |
1235 | that is we'll be comparing values of this type, fetch the | |
1236 | value now. Otherwise, on the next update the old value | |
1237 | will be lazy, which means we've lost that old value. */ | |
1238 | if (need_to_fetch && value && value_lazy (value)) | |
1239 | { | |
c1cc6152 | 1240 | const struct varobj *parent = var->parent; |
4c37490d | 1241 | bool frozen = var->frozen; |
a109c7c1 | 1242 | |
25d5ea92 VP |
1243 | for (; !frozen && parent; parent = parent->parent) |
1244 | frozen |= parent->frozen; | |
1245 | ||
1246 | if (frozen && initial) | |
1247 | { | |
1248 | /* For variables that are frozen, or are children of frozen | |
1249 | variables, we don't do fetch on initial assignment. | |
30baf67b | 1250 | For non-initial assignment we do the fetch, since it means we're |
25d5ea92 | 1251 | explicitly asked to compare the new value with the old one. */ |
4c37490d | 1252 | intentionally_not_fetched = true; |
25d5ea92 | 1253 | } |
8e7b59a5 | 1254 | else |
acd65feb | 1255 | { |
8e7b59a5 | 1256 | |
a70b8144 | 1257 | try |
8e7b59a5 KS |
1258 | { |
1259 | value_fetch_lazy (value); | |
1260 | } | |
1261 | ||
230d2906 | 1262 | catch (const gdb_exception_error &except) |
8e7b59a5 KS |
1263 | { |
1264 | /* Set the value to NULL, so that for the next -var-update, | |
1265 | we don't try to compare the new value with this value, | |
1266 | that we couldn't even read. */ | |
1267 | value = NULL; | |
1268 | } | |
acd65feb | 1269 | } |
acd65feb VP |
1270 | } |
1271 | ||
e848a8a5 TT |
1272 | /* Get a reference now, before possibly passing it to any Python |
1273 | code that might release it. */ | |
b4d61099 | 1274 | value_ref_ptr value_holder; |
e848a8a5 | 1275 | if (value != NULL) |
bbfa6f00 | 1276 | value_holder = value_ref_ptr::new_reference (value); |
b6313243 | 1277 | |
7a4d50bf VP |
1278 | /* Below, we'll be comparing string rendering of old and new |
1279 | values. Don't get string rendering if the value is | |
1280 | lazy -- if it is, the code above has decided that the value | |
1281 | should not be fetched. */ | |
2f408ecb | 1282 | std::string print_value; |
bb5ce47a YQ |
1283 | if (value != NULL && !value_lazy (value) |
1284 | && var->dynamic->pretty_printer == NULL) | |
99ad9427 | 1285 | print_value = varobj_value_get_print_value (value, var->format, var); |
7a4d50bf | 1286 | |
acd65feb VP |
1287 | /* If the type is changeable, compare the old and the new values. |
1288 | If this is the initial assignment, we don't have any old value | |
1289 | to compare with. */ | |
7a4d50bf | 1290 | if (!initial && changeable) |
acd65feb | 1291 | { |
3e43a32a MS |
1292 | /* If the value of the varobj was changed by -var-set-value, |
1293 | then the value in the varobj and in the target is the same. | |
1294 | However, that value is different from the value that the | |
581e13c1 | 1295 | varobj had after the previous -var-update. So need to the |
3e43a32a | 1296 | varobj as changed. */ |
acd65feb | 1297 | if (var->updated) |
4c37490d | 1298 | changed = true; |
bb5ce47a | 1299 | else if (var->dynamic->pretty_printer == NULL) |
acd65feb VP |
1300 | { |
1301 | /* Try to compare the values. That requires that both | |
1302 | values are non-lazy. */ | |
b4d61099 | 1303 | if (var->not_fetched && value_lazy (var->value.get ())) |
25d5ea92 VP |
1304 | { |
1305 | /* This is a frozen varobj and the value was never read. | |
1306 | Presumably, UI shows some "never read" indicator. | |
1307 | Now that we've fetched the real value, we need to report | |
1308 | this varobj as changed so that UI can show the real | |
1309 | value. */ | |
4c37490d | 1310 | changed = true; |
25d5ea92 | 1311 | } |
dda83cd7 | 1312 | else if (var->value == NULL && value == NULL) |
581e13c1 | 1313 | /* Equal. */ |
acd65feb VP |
1314 | ; |
1315 | else if (var->value == NULL || value == NULL) | |
57e66780 | 1316 | { |
4c37490d | 1317 | changed = true; |
57e66780 | 1318 | } |
acd65feb VP |
1319 | else |
1320 | { | |
b4d61099 | 1321 | gdb_assert (!value_lazy (var->value.get ())); |
acd65feb | 1322 | gdb_assert (!value_lazy (value)); |
85265413 | 1323 | |
2f408ecb PA |
1324 | gdb_assert (!var->print_value.empty () && !print_value.empty ()); |
1325 | if (var->print_value != print_value) | |
4c37490d | 1326 | changed = true; |
acd65feb VP |
1327 | } |
1328 | } | |
1329 | } | |
85265413 | 1330 | |
ee342b23 VP |
1331 | if (!initial && !changeable) |
1332 | { | |
1333 | /* For values that are not changeable, we don't compare the values. | |
1334 | However, we want to notice if a value was not NULL and now is NULL, | |
1335 | or vise versa, so that we report when top-level varobjs come in scope | |
1336 | and leave the scope. */ | |
1337 | changed = (var->value != NULL) != (value != NULL); | |
1338 | } | |
1339 | ||
acd65feb | 1340 | /* We must always keep the new value, since children depend on it. */ |
b4d61099 | 1341 | var->value = value_holder; |
25d5ea92 | 1342 | if (value && value_lazy (value) && intentionally_not_fetched) |
4c37490d | 1343 | var->not_fetched = true; |
25d5ea92 | 1344 | else |
4c37490d SM |
1345 | var->not_fetched = false; |
1346 | var->updated = false; | |
85265413 | 1347 | |
0cc7d26f TT |
1348 | install_new_value_visualizer (var); |
1349 | ||
1350 | /* If we installed a pretty-printer, re-compare the printed version | |
1351 | to see if the variable changed. */ | |
bb5ce47a | 1352 | if (var->dynamic->pretty_printer != NULL) |
0cc7d26f | 1353 | { |
b4d61099 TT |
1354 | print_value = varobj_value_get_print_value (var->value.get (), |
1355 | var->format, var); | |
2f408ecb PA |
1356 | if ((var->print_value.empty () && !print_value.empty ()) |
1357 | || (!var->print_value.empty () && print_value.empty ()) | |
1358 | || (!var->print_value.empty () && !print_value.empty () | |
1359 | && var->print_value != print_value)) | |
4c37490d | 1360 | changed = true; |
0cc7d26f | 1361 | } |
0cc7d26f TT |
1362 | var->print_value = print_value; |
1363 | ||
b4d61099 | 1364 | gdb_assert (var->value == nullptr || value_type (var->value.get ())); |
acd65feb VP |
1365 | |
1366 | return changed; | |
1367 | } | |
acd65feb | 1368 | |
0cc7d26f TT |
1369 | /* Return the requested range for a varobj. VAR is the varobj. FROM |
1370 | and TO are out parameters; *FROM and *TO will be set to the | |
1371 | selected sub-range of VAR. If no range was selected using | |
1372 | -var-set-update-range, then both will be -1. */ | |
1373 | void | |
b09e2c59 | 1374 | varobj_get_child_range (const struct varobj *var, int *from, int *to) |
b6313243 | 1375 | { |
0cc7d26f TT |
1376 | *from = var->from; |
1377 | *to = var->to; | |
b6313243 TT |
1378 | } |
1379 | ||
0cc7d26f TT |
1380 | /* Set the selected sub-range of children of VAR to start at index |
1381 | FROM and end at index TO. If either FROM or TO is less than zero, | |
1382 | this is interpreted as a request for all children. */ | |
1383 | void | |
1384 | varobj_set_child_range (struct varobj *var, int from, int to) | |
b6313243 | 1385 | { |
0cc7d26f TT |
1386 | var->from = from; |
1387 | var->to = to; | |
b6313243 TT |
1388 | } |
1389 | ||
1390 | void | |
1391 | varobj_set_visualizer (struct varobj *var, const char *visualizer) | |
1392 | { | |
1393 | #if HAVE_PYTHON | |
bde7b3e3 | 1394 | PyObject *mainmod; |
b6313243 | 1395 | |
0646da15 TT |
1396 | if (!gdb_python_initialized) |
1397 | return; | |
1398 | ||
bde7b3e3 | 1399 | gdbpy_enter_varobj enter_py (var); |
b6313243 TT |
1400 | |
1401 | mainmod = PyImport_AddModule ("__main__"); | |
7c66fffc TT |
1402 | gdbpy_ref<> globals |
1403 | = gdbpy_ref<>::new_reference (PyModule_GetDict (mainmod)); | |
7780f186 TT |
1404 | gdbpy_ref<> constructor (PyRun_String (visualizer, Py_eval_input, |
1405 | globals.get (), globals.get ())); | |
b6313243 | 1406 | |
bde7b3e3 | 1407 | if (constructor == NULL) |
b6313243 TT |
1408 | { |
1409 | gdbpy_print_stack (); | |
da1f2771 | 1410 | error (_("Could not evaluate visualizer expression: %s"), visualizer); |
b6313243 TT |
1411 | } |
1412 | ||
bde7b3e3 | 1413 | construct_visualizer (var, constructor.get ()); |
b6313243 | 1414 | |
0cc7d26f | 1415 | /* If there are any children now, wipe them. */ |
30914ca8 | 1416 | varobj_delete (var, 1 /* children only */); |
0cc7d26f | 1417 | var->num_children = -1; |
b6313243 | 1418 | #else |
da1f2771 | 1419 | error (_("Python support required")); |
b6313243 TT |
1420 | #endif |
1421 | } | |
1422 | ||
7a290c40 | 1423 | /* If NEW_VALUE is the new value of the given varobj (var), return |
4c37490d | 1424 | true if var has mutated. In other words, if the type of |
7a290c40 JB |
1425 | the new value is different from the type of the varobj's old |
1426 | value. | |
1427 | ||
1428 | NEW_VALUE may be NULL, if the varobj is now out of scope. */ | |
1429 | ||
4c37490d | 1430 | static bool |
b09e2c59 | 1431 | varobj_value_has_mutated (const struct varobj *var, struct value *new_value, |
7a290c40 JB |
1432 | struct type *new_type) |
1433 | { | |
1434 | /* If we haven't previously computed the number of children in var, | |
1435 | it does not matter from the front-end's perspective whether | |
1436 | the type has mutated or not. For all intents and purposes, | |
1437 | it has not mutated. */ | |
1438 | if (var->num_children < 0) | |
4c37490d | 1439 | return false; |
7a290c40 | 1440 | |
4c37490d | 1441 | if (var->root->lang_ops->value_has_mutated != NULL) |
8776cfe9 JB |
1442 | { |
1443 | /* The varobj module, when installing new values, explicitly strips | |
1444 | references, saying that we're not interested in those addresses. | |
1445 | But detection of mutation happens before installing the new | |
1446 | value, so our value may be a reference that we need to strip | |
1447 | in order to remain consistent. */ | |
1448 | if (new_value != NULL) | |
1449 | new_value = coerce_ref (new_value); | |
1450 | return var->root->lang_ops->value_has_mutated (var, new_value, new_type); | |
1451 | } | |
7a290c40 | 1452 | else |
4c37490d | 1453 | return false; |
7a290c40 JB |
1454 | } |
1455 | ||
8b93c638 JM |
1456 | /* Update the values for a variable and its children. This is a |
1457 | two-pronged attack. First, re-parse the value for the root's | |
1458 | expression to see if it's changed. Then go all the way | |
1459 | through its children, reconstructing them and noting if they've | |
1460 | changed. | |
1461 | ||
4c37490d | 1462 | The IS_EXPLICIT parameter specifies if this call is result |
25d5ea92 | 1463 | of MI request to update this specific variable, or |
581e13c1 | 1464 | result of implicit -var-update *. For implicit request, we don't |
25d5ea92 | 1465 | update frozen variables. |
705da579 | 1466 | |
581e13c1 | 1467 | NOTE: This function may delete the caller's varobj. If it |
8756216b DP |
1468 | returns TYPE_CHANGED, then it has done this and VARP will be modified |
1469 | to point to the new varobj. */ | |
8b93c638 | 1470 | |
0604393c | 1471 | std::vector<varobj_update_result> |
4c37490d | 1472 | varobj_update (struct varobj **varp, bool is_explicit) |
8b93c638 | 1473 | { |
4c37490d | 1474 | bool type_changed = false; |
fe978cb0 | 1475 | struct value *newobj; |
0604393c SM |
1476 | std::vector<varobj_update_result> stack; |
1477 | std::vector<varobj_update_result> result; | |
8b93c638 | 1478 | |
25d5ea92 VP |
1479 | /* Frozen means frozen -- we don't check for any change in |
1480 | this varobj, including its going out of scope, or | |
1481 | changing type. One use case for frozen varobjs is | |
1482 | retaining previously evaluated expressions, and we don't | |
1483 | want them to be reevaluated at all. */ | |
fe978cb0 | 1484 | if (!is_explicit && (*varp)->frozen) |
f7f9ae2c | 1485 | return result; |
8756216b DP |
1486 | |
1487 | if (!(*varp)->root->is_valid) | |
f7f9ae2c | 1488 | { |
0604393c | 1489 | result.emplace_back (*varp, VAROBJ_INVALID); |
f7f9ae2c VP |
1490 | return result; |
1491 | } | |
8b93c638 | 1492 | |
25d5ea92 | 1493 | if ((*varp)->root->rootvar == *varp) |
ae093f96 | 1494 | { |
0604393c | 1495 | varobj_update_result r (*varp); |
f7f9ae2c | 1496 | |
581e13c1 | 1497 | /* Update the root variable. value_of_root can return NULL |
25d5ea92 | 1498 | if the variable is no longer around, i.e. we stepped out of |
581e13c1 | 1499 | the frame in which a local existed. We are letting the |
25d5ea92 VP |
1500 | value_of_root variable dispose of the varobj if the type |
1501 | has changed. */ | |
fe978cb0 | 1502 | newobj = value_of_root (varp, &type_changed); |
4c37490d SM |
1503 | if (update_type_if_necessary (*varp, newobj)) |
1504 | type_changed = true; | |
f7f9ae2c | 1505 | r.varobj = *varp; |
f7f9ae2c | 1506 | r.type_changed = type_changed; |
fe978cb0 | 1507 | if (install_new_value ((*varp), newobj, type_changed)) |
4c37490d | 1508 | r.changed = true; |
ea56f9c2 | 1509 | |
fe978cb0 | 1510 | if (newobj == NULL) |
f7f9ae2c | 1511 | r.status = VAROBJ_NOT_IN_SCOPE; |
4c37490d | 1512 | r.value_installed = true; |
f7f9ae2c VP |
1513 | |
1514 | if (r.status == VAROBJ_NOT_IN_SCOPE) | |
b6313243 | 1515 | { |
0b4bc29a | 1516 | if (r.type_changed || r.changed) |
0604393c SM |
1517 | result.push_back (std::move (r)); |
1518 | ||
b6313243 TT |
1519 | return result; |
1520 | } | |
a109c7c1 | 1521 | |
0604393c | 1522 | stack.push_back (std::move (r)); |
b20d8971 | 1523 | } |
0604393c SM |
1524 | else |
1525 | stack.emplace_back (*varp); | |
8b93c638 | 1526 | |
8756216b | 1527 | /* Walk through the children, reconstructing them all. */ |
0604393c | 1528 | while (!stack.empty ()) |
8b93c638 | 1529 | { |
0604393c SM |
1530 | varobj_update_result r = std::move (stack.back ()); |
1531 | stack.pop_back (); | |
b6313243 TT |
1532 | struct varobj *v = r.varobj; |
1533 | ||
b6313243 TT |
1534 | /* Update this variable, unless it's a root, which is already |
1535 | updated. */ | |
1536 | if (!r.value_installed) | |
7a290c40 JB |
1537 | { |
1538 | struct type *new_type; | |
1539 | ||
fe978cb0 | 1540 | newobj = value_of_child (v->parent, v->index); |
4c37490d SM |
1541 | if (update_type_if_necessary (v, newobj)) |
1542 | r.type_changed = true; | |
fe978cb0 PA |
1543 | if (newobj) |
1544 | new_type = value_type (newobj); | |
7a290c40 | 1545 | else |
ca20d462 | 1546 | new_type = v->root->lang_ops->type_of_child (v->parent, v->index); |
7a290c40 | 1547 | |
fe978cb0 | 1548 | if (varobj_value_has_mutated (v, newobj, new_type)) |
7a290c40 JB |
1549 | { |
1550 | /* The children are no longer valid; delete them now. | |
dda83cd7 | 1551 | Report the fact that its type changed as well. */ |
30914ca8 | 1552 | varobj_delete (v, 1 /* only_children */); |
7a290c40 JB |
1553 | v->num_children = -1; |
1554 | v->to = -1; | |
1555 | v->from = -1; | |
1556 | v->type = new_type; | |
4c37490d | 1557 | r.type_changed = true; |
7a290c40 JB |
1558 | } |
1559 | ||
fe978cb0 | 1560 | if (install_new_value (v, newobj, r.type_changed)) |
b6313243 | 1561 | { |
4c37490d SM |
1562 | r.changed = true; |
1563 | v->updated = false; | |
b6313243 TT |
1564 | } |
1565 | } | |
1566 | ||
31f628ae YQ |
1567 | /* We probably should not get children of a dynamic varobj, but |
1568 | for which -var-list-children was never invoked. */ | |
1569 | if (varobj_is_dynamic_p (v)) | |
b6313243 | 1570 | { |
b926417a | 1571 | std::vector<varobj *> changed, type_changed_vec, unchanged, newobj_vec; |
4c37490d | 1572 | bool children_changed = false; |
b6313243 TT |
1573 | |
1574 | if (v->frozen) | |
1575 | continue; | |
1576 | ||
bd046f64 | 1577 | if (!v->dynamic->children_requested) |
0cc7d26f | 1578 | { |
4c37490d | 1579 | bool dummy; |
0cc7d26f TT |
1580 | |
1581 | /* If we initially did not have potential children, but | |
1582 | now we do, consider the varobj as changed. | |
1583 | Otherwise, if children were never requested, consider | |
1584 | it as unchanged -- presumably, such varobj is not yet | |
1585 | expanded in the UI, so we need not bother getting | |
1586 | it. */ | |
1587 | if (!varobj_has_more (v, 0)) | |
1588 | { | |
8264ba82 | 1589 | update_dynamic_varobj_children (v, NULL, NULL, NULL, NULL, |
4c37490d | 1590 | &dummy, false, 0, 0); |
0cc7d26f | 1591 | if (varobj_has_more (v, 0)) |
4c37490d | 1592 | r.changed = true; |
0cc7d26f TT |
1593 | } |
1594 | ||
1595 | if (r.changed) | |
0604393c | 1596 | result.push_back (std::move (r)); |
0cc7d26f TT |
1597 | |
1598 | continue; | |
1599 | } | |
1600 | ||
4c37490d | 1601 | /* If update_dynamic_varobj_children returns false, then we have |
b6313243 | 1602 | a non-conforming pretty-printer, so we skip it. */ |
b926417a TT |
1603 | if (update_dynamic_varobj_children (v, &changed, &type_changed_vec, |
1604 | &newobj_vec, | |
1605 | &unchanged, &children_changed, | |
1606 | true, v->from, v->to)) | |
b6313243 | 1607 | { |
b926417a | 1608 | if (children_changed || !newobj_vec.empty ()) |
b6313243 | 1609 | { |
4c37490d | 1610 | r.children_changed = true; |
b926417a | 1611 | r.newobj = std::move (newobj_vec); |
b6313243 | 1612 | } |
0cc7d26f TT |
1613 | /* Push in reverse order so that the first child is |
1614 | popped from the work stack first, and so will be | |
1615 | added to result first. This does not affect | |
1616 | correctness, just "nicer". */ | |
b926417a | 1617 | for (int i = type_changed_vec.size () - 1; i >= 0; --i) |
8264ba82 | 1618 | { |
b926417a | 1619 | varobj_update_result item (type_changed_vec[i]); |
8264ba82 AG |
1620 | |
1621 | /* Type may change only if value was changed. */ | |
b926417a TT |
1622 | item.changed = true; |
1623 | item.type_changed = true; | |
1624 | item.value_installed = true; | |
0604393c | 1625 | |
b926417a | 1626 | stack.push_back (std::move (item)); |
8264ba82 | 1627 | } |
0604393c | 1628 | for (int i = changed.size () - 1; i >= 0; --i) |
b6313243 | 1629 | { |
b926417a | 1630 | varobj_update_result item (changed[i]); |
a109c7c1 | 1631 | |
b926417a TT |
1632 | item.changed = true; |
1633 | item.value_installed = true; | |
0604393c | 1634 | |
b926417a | 1635 | stack.push_back (std::move (item)); |
b6313243 | 1636 | } |
0604393c SM |
1637 | for (int i = unchanged.size () - 1; i >= 0; --i) |
1638 | { | |
1639 | if (!unchanged[i]->frozen) | |
1640 | { | |
b926417a | 1641 | varobj_update_result item (unchanged[i]); |
0604393c | 1642 | |
b926417a | 1643 | item.value_installed = true; |
0cc7d26f | 1644 | |
b926417a | 1645 | stack.push_back (std::move (item)); |
0604393c SM |
1646 | } |
1647 | } | |
1648 | if (r.changed || r.children_changed) | |
1649 | result.push_back (std::move (r)); | |
0cc7d26f | 1650 | |
b6313243 TT |
1651 | continue; |
1652 | } | |
1653 | } | |
28335dcc VP |
1654 | |
1655 | /* Push any children. Use reverse order so that the first | |
1656 | child is popped from the work stack first, and so | |
1657 | will be added to result first. This does not | |
1658 | affect correctness, just "nicer". */ | |
0604393c | 1659 | for (int i = v->children.size () - 1; i >= 0; --i) |
8b93c638 | 1660 | { |
ddf0ea08 | 1661 | varobj *c = v->children[i]; |
a109c7c1 | 1662 | |
28335dcc | 1663 | /* Child may be NULL if explicitly deleted by -var-delete. */ |
25d5ea92 | 1664 | if (c != NULL && !c->frozen) |
0604393c | 1665 | stack.emplace_back (c); |
8b93c638 | 1666 | } |
b6313243 TT |
1667 | |
1668 | if (r.changed || r.type_changed) | |
0604393c | 1669 | result.push_back (std::move (r)); |
8b93c638 JM |
1670 | } |
1671 | ||
f7f9ae2c | 1672 | return result; |
8b93c638 | 1673 | } |
8b93c638 JM |
1674 | |
1675 | /* Helper functions */ | |
1676 | ||
1677 | /* | |
1678 | * Variable object construction/destruction | |
1679 | */ | |
1680 | ||
1681 | static int | |
4c37490d | 1682 | delete_variable (struct varobj *var, bool only_children_p) |
8b93c638 JM |
1683 | { |
1684 | int delcount = 0; | |
1685 | ||
30914ca8 | 1686 | delete_variable_1 (&delcount, var, only_children_p, |
4c37490d | 1687 | true /* remove_from_parent_p */ ); |
8b93c638 JM |
1688 | |
1689 | return delcount; | |
1690 | } | |
1691 | ||
581e13c1 | 1692 | /* Delete the variable object VAR and its children. */ |
8b93c638 JM |
1693 | /* IMPORTANT NOTE: If we delete a variable which is a child |
1694 | and the parent is not removed we dump core. It must be always | |
581e13c1 | 1695 | initially called with remove_from_parent_p set. */ |
8b93c638 | 1696 | static void |
4c37490d SM |
1697 | delete_variable_1 (int *delcountp, struct varobj *var, bool only_children_p, |
1698 | bool remove_from_parent_p) | |
8b93c638 | 1699 | { |
581e13c1 | 1700 | /* Delete any children of this variable, too. */ |
ddf0ea08 | 1701 | for (varobj *child : var->children) |
28335dcc | 1702 | { |
214270ab VP |
1703 | if (!child) |
1704 | continue; | |
ddf0ea08 | 1705 | |
8b93c638 | 1706 | if (!remove_from_parent_p) |
28335dcc | 1707 | child->parent = NULL; |
ddf0ea08 | 1708 | |
4c37490d | 1709 | delete_variable_1 (delcountp, child, false, only_children_p); |
8b93c638 | 1710 | } |
ddf0ea08 | 1711 | var->children.clear (); |
8b93c638 | 1712 | |
581e13c1 | 1713 | /* if we were called to delete only the children we are done here. */ |
8b93c638 JM |
1714 | if (only_children_p) |
1715 | return; | |
1716 | ||
581e13c1 | 1717 | /* Otherwise, add it to the list of deleted ones and proceed to do so. */ |
2f408ecb | 1718 | /* If the name is empty, this is a temporary variable, that has not |
581e13c1 | 1719 | yet been installed, don't report it, it belongs to the caller... */ |
2f408ecb | 1720 | if (!var->obj_name.empty ()) |
8b93c638 | 1721 | { |
8b93c638 JM |
1722 | *delcountp = *delcountp + 1; |
1723 | } | |
1724 | ||
581e13c1 | 1725 | /* If this variable has a parent, remove it from its parent's list. */ |
8b93c638 JM |
1726 | /* OPTIMIZATION: if the parent of this variable is also being deleted, |
1727 | (as indicated by remove_from_parent_p) we don't bother doing an | |
1728 | expensive list search to find the element to remove when we are | |
581e13c1 | 1729 | discarding the list afterwards. */ |
72330bd6 | 1730 | if ((remove_from_parent_p) && (var->parent != NULL)) |
ddf0ea08 | 1731 | var->parent->children[var->index] = NULL; |
72330bd6 | 1732 | |
2f408ecb | 1733 | if (!var->obj_name.empty ()) |
73a93a32 | 1734 | uninstall_variable (var); |
8b93c638 | 1735 | |
581e13c1 | 1736 | /* Free memory associated with this variable. */ |
9e5b9d2b | 1737 | delete var; |
8b93c638 JM |
1738 | } |
1739 | ||
581e13c1 | 1740 | /* Install the given variable VAR with the object name VAR->OBJ_NAME. */ |
4c37490d | 1741 | static bool |
fba45db2 | 1742 | install_variable (struct varobj *var) |
8b93c638 | 1743 | { |
2c1413a9 TT |
1744 | hashval_t hash = htab_hash_string (var->obj_name.c_str ()); |
1745 | void **slot = htab_find_slot_with_hash (varobj_table, | |
1746 | var->obj_name.c_str (), | |
1747 | hash, INSERT); | |
1748 | if (*slot != nullptr) | |
8a3fe4f8 | 1749 | error (_("Duplicate variable object name")); |
8b93c638 | 1750 | |
581e13c1 | 1751 | /* Add varobj to hash table. */ |
2c1413a9 | 1752 | *slot = var; |
8b93c638 | 1753 | |
581e13c1 | 1754 | /* If root, add varobj to root list. */ |
b2c2bd75 | 1755 | if (is_root_p (var)) |
76deb5d9 | 1756 | rootlist.push_front (var->root); |
8b93c638 | 1757 | |
4c37490d | 1758 | return true; /* OK */ |
8b93c638 JM |
1759 | } |
1760 | ||
405feb71 | 1761 | /* Uninstall the object VAR. */ |
8b93c638 | 1762 | static void |
fba45db2 | 1763 | uninstall_variable (struct varobj *var) |
8b93c638 | 1764 | { |
2c1413a9 TT |
1765 | hashval_t hash = htab_hash_string (var->obj_name.c_str ()); |
1766 | htab_remove_elt_with_hash (varobj_table, var->obj_name.c_str (), hash); | |
8b93c638 JM |
1767 | |
1768 | if (varobjdebug) | |
2f408ecb | 1769 | fprintf_unfiltered (gdb_stdlog, "Deleting %s\n", var->obj_name.c_str ()); |
8b93c638 | 1770 | |
581e13c1 | 1771 | /* If root, remove varobj from root list. */ |
b2c2bd75 | 1772 | if (is_root_p (var)) |
8b93c638 | 1773 | { |
76deb5d9 TT |
1774 | auto iter = std::find (rootlist.begin (), rootlist.end (), var->root); |
1775 | rootlist.erase (iter); | |
8b93c638 | 1776 | } |
8b93c638 JM |
1777 | } |
1778 | ||
837ce252 SM |
1779 | /* Create and install a child of the parent of the given name. |
1780 | ||
1781 | The created VAROBJ takes ownership of the allocated NAME. */ | |
1782 | ||
8b93c638 | 1783 | static struct varobj * |
2f408ecb | 1784 | create_child (struct varobj *parent, int index, std::string &name) |
b6313243 | 1785 | { |
5a2e0d6e YQ |
1786 | struct varobj_item item; |
1787 | ||
2f408ecb | 1788 | std::swap (item.name, name); |
11106495 | 1789 | item.value = release_value (value_of_child (parent, index)); |
5a2e0d6e YQ |
1790 | |
1791 | return create_child_with_value (parent, index, &item); | |
b6313243 TT |
1792 | } |
1793 | ||
1794 | static struct varobj * | |
5a2e0d6e YQ |
1795 | create_child_with_value (struct varobj *parent, int index, |
1796 | struct varobj_item *item) | |
8b93c638 | 1797 | { |
9e5b9d2b | 1798 | varobj *child = new varobj (parent->root); |
8b93c638 | 1799 | |
5e5ac9a5 | 1800 | /* NAME is allocated by caller. */ |
2f408ecb | 1801 | std::swap (child->name, item->name); |
8b93c638 | 1802 | child->index = index; |
8b93c638 | 1803 | child->parent = parent; |
85254831 | 1804 | |
99ad9427 | 1805 | if (varobj_is_anonymous_child (child)) |
2f408ecb PA |
1806 | child->obj_name = string_printf ("%s.%d_anonymous", |
1807 | parent->obj_name.c_str (), index); | |
85254831 | 1808 | else |
2f408ecb PA |
1809 | child->obj_name = string_printf ("%s.%s", |
1810 | parent->obj_name.c_str (), | |
1811 | child->name.c_str ()); | |
85254831 | 1812 | |
8b93c638 JM |
1813 | install_variable (child); |
1814 | ||
acd65feb VP |
1815 | /* Compute the type of the child. Must do this before |
1816 | calling install_new_value. */ | |
5a2e0d6e | 1817 | if (item->value != NULL) |
acd65feb | 1818 | /* If the child had no evaluation errors, var->value |
581e13c1 | 1819 | will be non-NULL and contain a valid type. */ |
11106495 | 1820 | child->type = value_actual_type (item->value.get (), 0, NULL); |
acd65feb | 1821 | else |
581e13c1 | 1822 | /* Otherwise, we must compute the type. */ |
ca20d462 YQ |
1823 | child->type = (*child->root->lang_ops->type_of_child) (child->parent, |
1824 | child->index); | |
11106495 | 1825 | install_new_value (child, item->value.get (), 1); |
acd65feb | 1826 | |
8b93c638 JM |
1827 | return child; |
1828 | } | |
8b93c638 JM |
1829 | \f |
1830 | ||
1831 | /* | |
1832 | * Miscellaneous utility functions. | |
1833 | */ | |
1834 | ||
581e13c1 | 1835 | /* Allocate memory and initialize a new variable. */ |
9e5b9d2b SM |
1836 | varobj::varobj (varobj_root *root_) |
1837 | : root (root_), dynamic (new varobj_dynamic) | |
8b93c638 | 1838 | { |
8b93c638 JM |
1839 | } |
1840 | ||
581e13c1 | 1841 | /* Free any allocated memory associated with VAR. */ |
9e5b9d2b SM |
1842 | |
1843 | varobj::~varobj () | |
8b93c638 | 1844 | { |
9e5b9d2b SM |
1845 | varobj *var = this; |
1846 | ||
d452c4bc | 1847 | #if HAVE_PYTHON |
bb5ce47a | 1848 | if (var->dynamic->pretty_printer != NULL) |
d452c4bc | 1849 | { |
bde7b3e3 | 1850 | gdbpy_enter_varobj enter_py (var); |
bb5ce47a YQ |
1851 | |
1852 | Py_XDECREF (var->dynamic->constructor); | |
1853 | Py_XDECREF (var->dynamic->pretty_printer); | |
d452c4bc UW |
1854 | } |
1855 | #endif | |
1856 | ||
b2c2bd75 | 1857 | if (is_root_p (var)) |
4d01a485 | 1858 | delete var->root; |
8b93c638 | 1859 | |
9e5b9d2b | 1860 | delete var->dynamic; |
74b7792f AC |
1861 | } |
1862 | ||
6e2a9270 VP |
1863 | /* Return the type of the value that's stored in VAR, |
1864 | or that would have being stored there if the | |
581e13c1 | 1865 | value were accessible. |
6e2a9270 VP |
1866 | |
1867 | This differs from VAR->type in that VAR->type is always | |
85102364 | 1868 | the true type of the expression in the source language. |
6e2a9270 VP |
1869 | The return value of this function is the type we're |
1870 | actually storing in varobj, and using for displaying | |
1871 | the values and for comparing previous and new values. | |
1872 | ||
1873 | For example, top-level references are always stripped. */ | |
99ad9427 | 1874 | struct type * |
b09e2c59 | 1875 | varobj_get_value_type (const struct varobj *var) |
6e2a9270 VP |
1876 | { |
1877 | struct type *type; | |
1878 | ||
b4d61099 TT |
1879 | if (var->value != nullptr) |
1880 | type = value_type (var->value.get ()); | |
6e2a9270 VP |
1881 | else |
1882 | type = var->type; | |
1883 | ||
1884 | type = check_typedef (type); | |
1885 | ||
aa006118 | 1886 | if (TYPE_IS_REFERENCE (type)) |
6e2a9270 VP |
1887 | type = get_target_type (type); |
1888 | ||
1889 | type = check_typedef (type); | |
1890 | ||
1891 | return type; | |
1892 | } | |
1893 | ||
8b93c638 | 1894 | /* What is the default display for this variable? We assume that |
581e13c1 | 1895 | everything is "natural". Any exceptions? */ |
8b93c638 | 1896 | static enum varobj_display_formats |
fba45db2 | 1897 | variable_default_display (struct varobj *var) |
8b93c638 JM |
1898 | { |
1899 | return FORMAT_NATURAL; | |
1900 | } | |
1901 | ||
8b93c638 JM |
1902 | /* |
1903 | * Language-dependencies | |
1904 | */ | |
1905 | ||
1906 | /* Common entry points */ | |
1907 | ||
8b93c638 JM |
1908 | /* Return the number of children for a given variable. |
1909 | The result of this function is defined by the language | |
581e13c1 | 1910 | implementation. The number of children returned by this function |
8b93c638 | 1911 | is the number of children that the user will see in the variable |
581e13c1 | 1912 | display. */ |
8b93c638 | 1913 | static int |
b09e2c59 | 1914 | number_of_children (const struct varobj *var) |
8b93c638 | 1915 | { |
ca20d462 | 1916 | return (*var->root->lang_ops->number_of_children) (var); |
8b93c638 JM |
1917 | } |
1918 | ||
2f408ecb PA |
1919 | /* What is the expression for the root varobj VAR? */ |
1920 | ||
1921 | static std::string | |
b09e2c59 | 1922 | name_of_variable (const struct varobj *var) |
8b93c638 | 1923 | { |
ca20d462 | 1924 | return (*var->root->lang_ops->name_of_variable) (var); |
8b93c638 JM |
1925 | } |
1926 | ||
2f408ecb PA |
1927 | /* What is the name of the INDEX'th child of VAR? */ |
1928 | ||
1929 | static std::string | |
fba45db2 | 1930 | name_of_child (struct varobj *var, int index) |
8b93c638 | 1931 | { |
ca20d462 | 1932 | return (*var->root->lang_ops->name_of_child) (var, index); |
8b93c638 JM |
1933 | } |
1934 | ||
2213e2be | 1935 | /* If frame associated with VAR can be found, switch |
4c37490d | 1936 | to it and return true. Otherwise, return false. */ |
2213e2be | 1937 | |
4c37490d | 1938 | static bool |
b09e2c59 | 1939 | check_scope (const struct varobj *var) |
2213e2be YQ |
1940 | { |
1941 | struct frame_info *fi; | |
4c37490d | 1942 | bool scope; |
2213e2be YQ |
1943 | |
1944 | fi = frame_find_by_id (var->root->frame); | |
1945 | scope = fi != NULL; | |
1946 | ||
1947 | if (fi) | |
1948 | { | |
1949 | CORE_ADDR pc = get_frame_pc (fi); | |
1950 | ||
1951 | if (pc < BLOCK_START (var->root->valid_block) || | |
1952 | pc >= BLOCK_END (var->root->valid_block)) | |
4c37490d | 1953 | scope = false; |
2213e2be YQ |
1954 | else |
1955 | select_frame (fi); | |
1956 | } | |
1957 | return scope; | |
1958 | } | |
1959 | ||
1960 | /* Helper function to value_of_root. */ | |
1961 | ||
1962 | static struct value * | |
1963 | value_of_root_1 (struct varobj **var_handle) | |
1964 | { | |
1965 | struct value *new_val = NULL; | |
1966 | struct varobj *var = *var_handle; | |
4c37490d | 1967 | bool within_scope = false; |
2213e2be YQ |
1968 | |
1969 | /* Only root variables can be updated... */ | |
1970 | if (!is_root_p (var)) | |
1971 | /* Not a root var. */ | |
1972 | return NULL; | |
1973 | ||
5ed8105e | 1974 | scoped_restore_current_thread restore_thread; |
2213e2be YQ |
1975 | |
1976 | /* Determine whether the variable is still around. */ | |
1977 | if (var->root->valid_block == NULL || var->root->floating) | |
4c37490d | 1978 | within_scope = true; |
2213e2be YQ |
1979 | else if (var->root->thread_id == 0) |
1980 | { | |
1981 | /* The program was single-threaded when the variable object was | |
1982 | created. Technically, it's possible that the program became | |
1983 | multi-threaded since then, but we don't support such | |
1984 | scenario yet. */ | |
1985 | within_scope = check_scope (var); | |
1986 | } | |
1987 | else | |
1988 | { | |
00431a78 | 1989 | thread_info *thread = find_thread_global_id (var->root->thread_id); |
5d5658a1 | 1990 | |
00431a78 | 1991 | if (thread != NULL) |
2213e2be | 1992 | { |
00431a78 | 1993 | switch_to_thread (thread); |
2213e2be YQ |
1994 | within_scope = check_scope (var); |
1995 | } | |
1996 | } | |
1997 | ||
1998 | if (within_scope) | |
1999 | { | |
2213e2be YQ |
2000 | |
2001 | /* We need to catch errors here, because if evaluate | |
dda83cd7 | 2002 | expression fails we want to just return NULL. */ |
a70b8144 | 2003 | try |
2213e2be | 2004 | { |
4d01a485 | 2005 | new_val = evaluate_expression (var->root->exp.get ()); |
2213e2be | 2006 | } |
230d2906 | 2007 | catch (const gdb_exception_error &except) |
492d29ea PA |
2008 | { |
2009 | } | |
2213e2be YQ |
2010 | } |
2011 | ||
2213e2be YQ |
2012 | return new_val; |
2013 | } | |
2014 | ||
a5defcdc VP |
2015 | /* What is the ``struct value *'' of the root variable VAR? |
2016 | For floating variable object, evaluation can get us a value | |
2017 | of different type from what is stored in varobj already. In | |
2018 | that case: | |
2019 | - *type_changed will be set to 1 | |
2020 | - old varobj will be freed, and new one will be | |
2021 | created, with the same name. | |
2022 | - *var_handle will be set to the new varobj | |
2023 | Otherwise, *type_changed will be set to 0. */ | |
30b28db1 | 2024 | static struct value * |
4c37490d | 2025 | value_of_root (struct varobj **var_handle, bool *type_changed) |
8b93c638 | 2026 | { |
73a93a32 JI |
2027 | struct varobj *var; |
2028 | ||
2029 | if (var_handle == NULL) | |
2030 | return NULL; | |
2031 | ||
2032 | var = *var_handle; | |
2033 | ||
2034 | /* This should really be an exception, since this should | |
581e13c1 | 2035 | only get called with a root variable. */ |
73a93a32 | 2036 | |
b2c2bd75 | 2037 | if (!is_root_p (var)) |
73a93a32 JI |
2038 | return NULL; |
2039 | ||
a5defcdc | 2040 | if (var->root->floating) |
73a93a32 JI |
2041 | { |
2042 | struct varobj *tmp_var; | |
6225abfa | 2043 | |
2f408ecb | 2044 | tmp_var = varobj_create (NULL, var->name.c_str (), (CORE_ADDR) 0, |
73a93a32 JI |
2045 | USE_SELECTED_FRAME); |
2046 | if (tmp_var == NULL) | |
2047 | { | |
2048 | return NULL; | |
2049 | } | |
2f408ecb PA |
2050 | std::string old_type = varobj_get_type (var); |
2051 | std::string new_type = varobj_get_type (tmp_var); | |
2052 | if (old_type == new_type) | |
73a93a32 | 2053 | { |
fcacd99f VP |
2054 | /* The expression presently stored inside var->root->exp |
2055 | remembers the locations of local variables relatively to | |
2056 | the frame where the expression was created (in DWARF location | |
2057 | button, for example). Naturally, those locations are not | |
2058 | correct in other frames, so update the expression. */ | |
2059 | ||
4d01a485 | 2060 | std::swap (var->root->exp, tmp_var->root->exp); |
fcacd99f | 2061 | |
30914ca8 | 2062 | varobj_delete (tmp_var, 0); |
73a93a32 JI |
2063 | *type_changed = 0; |
2064 | } | |
2065 | else | |
2066 | { | |
2f408ecb | 2067 | tmp_var->obj_name = var->obj_name; |
0cc7d26f TT |
2068 | tmp_var->from = var->from; |
2069 | tmp_var->to = var->to; | |
30914ca8 | 2070 | varobj_delete (var, 0); |
a5defcdc | 2071 | |
73a93a32 JI |
2072 | install_variable (tmp_var); |
2073 | *var_handle = tmp_var; | |
705da579 | 2074 | var = *var_handle; |
4c37490d | 2075 | *type_changed = true; |
73a93a32 JI |
2076 | } |
2077 | } | |
2078 | else | |
2079 | { | |
2080 | *type_changed = 0; | |
2081 | } | |
2082 | ||
7a290c40 JB |
2083 | { |
2084 | struct value *value; | |
2085 | ||
2213e2be | 2086 | value = value_of_root_1 (var_handle); |
7a290c40 JB |
2087 | if (var->value == NULL || value == NULL) |
2088 | { | |
2089 | /* For root varobj-s, a NULL value indicates a scoping issue. | |
2090 | So, nothing to do in terms of checking for mutations. */ | |
2091 | } | |
2092 | else if (varobj_value_has_mutated (var, value, value_type (value))) | |
2093 | { | |
2094 | /* The type has mutated, so the children are no longer valid. | |
2095 | Just delete them, and tell our caller that the type has | |
2096 | changed. */ | |
30914ca8 | 2097 | varobj_delete (var, 1 /* only_children */); |
7a290c40 JB |
2098 | var->num_children = -1; |
2099 | var->to = -1; | |
2100 | var->from = -1; | |
4c37490d | 2101 | *type_changed = true; |
7a290c40 JB |
2102 | } |
2103 | return value; | |
2104 | } | |
8b93c638 JM |
2105 | } |
2106 | ||
581e13c1 | 2107 | /* What is the ``struct value *'' for the INDEX'th child of PARENT? */ |
30b28db1 | 2108 | static struct value * |
c1cc6152 | 2109 | value_of_child (const struct varobj *parent, int index) |
8b93c638 | 2110 | { |
30b28db1 | 2111 | struct value *value; |
8b93c638 | 2112 | |
ca20d462 | 2113 | value = (*parent->root->lang_ops->value_of_child) (parent, index); |
8b93c638 | 2114 | |
8b93c638 JM |
2115 | return value; |
2116 | } | |
2117 | ||
581e13c1 | 2118 | /* GDB already has a command called "value_of_variable". Sigh. */ |
2f408ecb | 2119 | static std::string |
de051565 | 2120 | my_value_of_variable (struct varobj *var, enum varobj_display_formats format) |
8b93c638 | 2121 | { |
8756216b | 2122 | if (var->root->is_valid) |
0cc7d26f | 2123 | { |
bb5ce47a | 2124 | if (var->dynamic->pretty_printer != NULL) |
b4d61099 TT |
2125 | return varobj_value_get_print_value (var->value.get (), var->format, |
2126 | var); | |
ca20d462 | 2127 | return (*var->root->lang_ops->value_of_variable) (var, format); |
0cc7d26f | 2128 | } |
8756216b | 2129 | else |
2f408ecb | 2130 | return std::string (); |
8b93c638 JM |
2131 | } |
2132 | ||
99ad9427 YQ |
2133 | void |
2134 | varobj_formatted_print_options (struct value_print_options *opts, | |
2135 | enum varobj_display_formats format) | |
2136 | { | |
2137 | get_formatted_print_options (opts, format_code[(int) format]); | |
2138 | opts->deref_ref = 0; | |
0625771b | 2139 | opts->raw = !pretty_printing; |
99ad9427 YQ |
2140 | } |
2141 | ||
2f408ecb | 2142 | std::string |
99ad9427 YQ |
2143 | varobj_value_get_print_value (struct value *value, |
2144 | enum varobj_display_formats format, | |
b09e2c59 | 2145 | const struct varobj *var) |
85265413 | 2146 | { |
79a45b7d | 2147 | struct value_print_options opts; |
be759fcf PM |
2148 | struct type *type = NULL; |
2149 | long len = 0; | |
1eba6383 | 2150 | gdb::unique_xmalloc_ptr<char> encoding; |
3a182a69 JK |
2151 | /* Initialize it just to avoid a GCC false warning. */ |
2152 | CORE_ADDR str_addr = 0; | |
4c37490d | 2153 | bool string_print = false; |
57e66780 DJ |
2154 | |
2155 | if (value == NULL) | |
2f408ecb | 2156 | return std::string (); |
57e66780 | 2157 | |
d7e74731 | 2158 | string_file stb; |
2f408ecb PA |
2159 | std::string thevalue; |
2160 | ||
b6313243 | 2161 | #if HAVE_PYTHON |
0646da15 TT |
2162 | if (gdb_python_initialized) |
2163 | { | |
bb5ce47a | 2164 | PyObject *value_formatter = var->dynamic->pretty_printer; |
d452c4bc | 2165 | |
68cdc557 | 2166 | gdbpy_enter_varobj enter_py (var); |
09ca9e2e | 2167 | |
0646da15 TT |
2168 | if (value_formatter) |
2169 | { | |
2170 | /* First check to see if we have any children at all. If so, | |
2171 | we simply return {...}. */ | |
2172 | if (dynamic_varobj_has_child_method (var)) | |
d7e74731 | 2173 | return "{...}"; |
b6313243 | 2174 | |
0646da15 TT |
2175 | if (PyObject_HasAttr (value_formatter, gdbpy_to_string_cst)) |
2176 | { | |
2177 | struct value *replacement; | |
0646da15 | 2178 | |
a5c5eda7 SM |
2179 | gdbpy_ref<> output = apply_varobj_pretty_printer (value_formatter, |
2180 | &replacement, | |
2181 | &stb); | |
0646da15 TT |
2182 | |
2183 | /* If we have string like output ... */ | |
68cdc557 | 2184 | if (output != NULL) |
0646da15 | 2185 | { |
0646da15 TT |
2186 | /* If this is a lazy string, extract it. For lazy |
2187 | strings we always print as a string, so set | |
2188 | string_print. */ | |
68cdc557 | 2189 | if (gdbpy_is_lazy_string (output.get ())) |
0646da15 | 2190 | { |
68cdc557 TT |
2191 | gdbpy_extract_lazy_string (output.get (), &str_addr, |
2192 | &type, &len, &encoding); | |
4c37490d | 2193 | string_print = true; |
0646da15 TT |
2194 | } |
2195 | else | |
2196 | { | |
2197 | /* If it is a regular (non-lazy) string, extract | |
2198 | it and copy the contents into THEVALUE. If the | |
2199 | hint says to print it as a string, set | |
2200 | string_print. Otherwise just return the extracted | |
2201 | string as a value. */ | |
2202 | ||
9b972014 | 2203 | gdb::unique_xmalloc_ptr<char> s |
68cdc557 | 2204 | = python_string_to_target_string (output.get ()); |
0646da15 TT |
2205 | |
2206 | if (s) | |
2207 | { | |
e3821cca | 2208 | struct gdbarch *gdbarch; |
0646da15 | 2209 | |
9b972014 TT |
2210 | gdb::unique_xmalloc_ptr<char> hint |
2211 | = gdbpy_get_display_hint (value_formatter); | |
0646da15 TT |
2212 | if (hint) |
2213 | { | |
9b972014 | 2214 | if (!strcmp (hint.get (), "string")) |
4c37490d | 2215 | string_print = true; |
0646da15 TT |
2216 | } |
2217 | ||
9b972014 | 2218 | thevalue = std::string (s.get ()); |
2f408ecb | 2219 | len = thevalue.size (); |
e3821cca | 2220 | gdbarch = get_type_arch (value_type (value)); |
0646da15 | 2221 | type = builtin_type (gdbarch)->builtin_char; |
0646da15 TT |
2222 | |
2223 | if (!string_print) | |
d7e74731 | 2224 | return thevalue; |
0646da15 TT |
2225 | } |
2226 | else | |
2227 | gdbpy_print_stack (); | |
2228 | } | |
2229 | } | |
2230 | /* If the printer returned a replacement value, set VALUE | |
2231 | to REPLACEMENT. If there is not a replacement value, | |
2232 | just use the value passed to this function. */ | |
2233 | if (replacement) | |
2234 | value = replacement; | |
2235 | } | |
2236 | } | |
2237 | } | |
b6313243 TT |
2238 | #endif |
2239 | ||
99ad9427 | 2240 | varobj_formatted_print_options (&opts, format); |
00bd41d6 PM |
2241 | |
2242 | /* If the THEVALUE has contents, it is a regular string. */ | |
2f408ecb | 2243 | if (!thevalue.empty ()) |
d7e74731 | 2244 | LA_PRINT_STRING (&stb, type, (gdb_byte *) thevalue.c_str (), |
1eba6383 | 2245 | len, encoding.get (), 0, &opts); |
09ca9e2e | 2246 | else if (string_print) |
00bd41d6 PM |
2247 | /* Otherwise, if string_print is set, and it is not a regular |
2248 | string, it is a lazy string. */ | |
d7e74731 | 2249 | val_print_string (type, encoding.get (), str_addr, len, &stb, &opts); |
b6313243 | 2250 | else |
00bd41d6 | 2251 | /* All other cases. */ |
d7e74731 | 2252 | common_val_print (value, &stb, 0, &opts, current_language); |
57e66780 | 2253 | |
d7e74731 | 2254 | return std::move (stb.string ()); |
85265413 NR |
2255 | } |
2256 | ||
4c37490d | 2257 | bool |
b09e2c59 | 2258 | varobj_editable_p (const struct varobj *var) |
340a7723 NR |
2259 | { |
2260 | struct type *type; | |
340a7723 | 2261 | |
b4d61099 TT |
2262 | if (!(var->root->is_valid && var->value != nullptr |
2263 | && VALUE_LVAL (var->value.get ()))) | |
4c37490d | 2264 | return false; |
340a7723 | 2265 | |
99ad9427 | 2266 | type = varobj_get_value_type (var); |
340a7723 | 2267 | |
78134374 | 2268 | switch (type->code ()) |
340a7723 NR |
2269 | { |
2270 | case TYPE_CODE_STRUCT: | |
2271 | case TYPE_CODE_UNION: | |
2272 | case TYPE_CODE_ARRAY: | |
2273 | case TYPE_CODE_FUNC: | |
2274 | case TYPE_CODE_METHOD: | |
4c37490d | 2275 | return false; |
340a7723 NR |
2276 | break; |
2277 | ||
2278 | default: | |
4c37490d | 2279 | return true; |
340a7723 NR |
2280 | break; |
2281 | } | |
2282 | } | |
2283 | ||
d32cafc7 | 2284 | /* Call VAR's value_is_changeable_p language-specific callback. */ |
acd65feb | 2285 | |
4c37490d | 2286 | bool |
b09e2c59 | 2287 | varobj_value_is_changeable_p (const struct varobj *var) |
8b93c638 | 2288 | { |
ca20d462 | 2289 | return var->root->lang_ops->value_is_changeable_p (var); |
8b93c638 JM |
2290 | } |
2291 | ||
4c37490d | 2292 | /* Return true if that varobj is floating, that is is always evaluated in the |
5a413362 VP |
2293 | selected frame, and not bound to thread/frame. Such variable objects |
2294 | are created using '@' as frame specifier to -var-create. */ | |
4c37490d | 2295 | bool |
b09e2c59 | 2296 | varobj_floating_p (const struct varobj *var) |
5a413362 VP |
2297 | { |
2298 | return var->root->floating; | |
2299 | } | |
2300 | ||
d32cafc7 JB |
2301 | /* Implement the "value_is_changeable_p" varobj callback for most |
2302 | languages. */ | |
2303 | ||
4c37490d | 2304 | bool |
b09e2c59 | 2305 | varobj_default_value_is_changeable_p (const struct varobj *var) |
d32cafc7 | 2306 | { |
4c37490d | 2307 | bool r; |
d32cafc7 JB |
2308 | struct type *type; |
2309 | ||
2310 | if (CPLUS_FAKE_CHILD (var)) | |
4c37490d | 2311 | return false; |
d32cafc7 | 2312 | |
99ad9427 | 2313 | type = varobj_get_value_type (var); |
d32cafc7 | 2314 | |
78134374 | 2315 | switch (type->code ()) |
d32cafc7 JB |
2316 | { |
2317 | case TYPE_CODE_STRUCT: | |
2318 | case TYPE_CODE_UNION: | |
2319 | case TYPE_CODE_ARRAY: | |
4c37490d | 2320 | r = false; |
d32cafc7 JB |
2321 | break; |
2322 | ||
2323 | default: | |
4c37490d | 2324 | r = true; |
d32cafc7 JB |
2325 | } |
2326 | ||
2327 | return r; | |
2328 | } | |
2329 | ||
d8f168dd TT |
2330 | /* Iterate all the existing _root_ VAROBJs and call the FUNC callback |
2331 | for each one. */ | |
54333c3b JK |
2332 | |
2333 | void | |
d8f168dd | 2334 | all_root_varobjs (gdb::function_view<void (struct varobj *var)> func) |
54333c3b | 2335 | { |
54333c3b | 2336 | /* Iterate "safely" - handle if the callee deletes its passed VAROBJ. */ |
76deb5d9 TT |
2337 | auto iter = rootlist.begin (); |
2338 | auto end = rootlist.end (); | |
2339 | while (iter != end) | |
54333c3b | 2340 | { |
76deb5d9 | 2341 | auto self = iter++; |
d8f168dd | 2342 | func ((*self)->rootvar); |
54333c3b JK |
2343 | } |
2344 | } | |
8756216b | 2345 | |
54333c3b | 2346 | /* Invalidate varobj VAR if it is tied to locals and re-create it if it is |
4e969b4f AB |
2347 | defined on globals. It is a helper for varobj_invalidate. |
2348 | ||
2349 | This function is called after changing the symbol file, in this case the | |
2350 | pointers to "struct type" stored by the varobj are no longer valid. All | |
2351 | varobj must be either re-evaluated, or marked as invalid here. */ | |
2dbd25e5 | 2352 | |
54333c3b | 2353 | static void |
d8f168dd | 2354 | varobj_invalidate_iter (struct varobj *var) |
8756216b | 2355 | { |
4e969b4f AB |
2356 | /* global and floating var must be re-evaluated. */ |
2357 | if (var->root->floating || var->root->valid_block == NULL) | |
2dbd25e5 | 2358 | { |
54333c3b | 2359 | struct varobj *tmp_var; |
2dbd25e5 | 2360 | |
54333c3b JK |
2361 | /* Try to create a varobj with same expression. If we succeed |
2362 | replace the old varobj, otherwise invalidate it. */ | |
2f408ecb | 2363 | tmp_var = varobj_create (NULL, var->name.c_str (), (CORE_ADDR) 0, |
54333c3b JK |
2364 | USE_CURRENT_FRAME); |
2365 | if (tmp_var != NULL) | |
2366 | { | |
2f408ecb | 2367 | tmp_var->obj_name = var->obj_name; |
30914ca8 | 2368 | varobj_delete (var, 0); |
54333c3b | 2369 | install_variable (tmp_var); |
2dbd25e5 | 2370 | } |
54333c3b | 2371 | else |
4c37490d | 2372 | var->root->is_valid = false; |
2dbd25e5 | 2373 | } |
54333c3b | 2374 | else /* locals must be invalidated. */ |
4c37490d | 2375 | var->root->is_valid = false; |
54333c3b JK |
2376 | } |
2377 | ||
2378 | /* Invalidate the varobjs that are tied to locals and re-create the ones that | |
2379 | are defined on globals. | |
2380 | Invalidated varobjs will be always printed in_scope="invalid". */ | |
2381 | ||
2382 | void | |
2383 | varobj_invalidate (void) | |
2384 | { | |
d8f168dd | 2385 | all_root_varobjs (varobj_invalidate_iter); |
8756216b | 2386 | } |
481695ed | 2387 | |
2c1413a9 TT |
2388 | /* A hash function for a varobj. */ |
2389 | ||
2390 | static hashval_t | |
2391 | hash_varobj (const void *a) | |
2392 | { | |
2393 | const varobj *obj = (const varobj *) a; | |
2394 | return htab_hash_string (obj->obj_name.c_str ()); | |
2395 | } | |
2396 | ||
2397 | /* A hash table equality function for varobjs. */ | |
2398 | ||
2399 | static int | |
2400 | eq_varobj_and_string (const void *a, const void *b) | |
2401 | { | |
2402 | const varobj *obj = (const varobj *) a; | |
2403 | const char *name = (const char *) b; | |
2404 | ||
2405 | return obj->obj_name == name; | |
2406 | } | |
2407 | ||
6c265988 | 2408 | void _initialize_varobj (); |
1c3569d4 | 2409 | void |
6c265988 | 2410 | _initialize_varobj () |
1c3569d4 | 2411 | { |
2c1413a9 TT |
2412 | varobj_table = htab_create_alloc (5, hash_varobj, eq_varobj_and_string, |
2413 | nullptr, xcalloc, xfree); | |
1c3569d4 MR |
2414 | |
2415 | add_setshow_zuinteger_cmd ("varobj", class_maintenance, | |
2416 | &varobjdebug, | |
2417 | _("Set varobj debugging."), | |
2418 | _("Show varobj debugging."), | |
2419 | _("When non-zero, varobj debugging is enabled."), | |
2420 | NULL, show_varobjdebug, | |
2421 | &setdebuglist, &showdebuglist); | |
2422 | } |