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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]; |
4c37490d | 628 | bool type_updated = update_type_if_necessary (existing, item->value); |
bf8793bb | 629 | |
8264ba82 AG |
630 | if (type_updated) |
631 | { | |
0604393c SM |
632 | if (type_changed != NULL) |
633 | type_changed->push_back (existing); | |
8264ba82 | 634 | } |
5a2e0d6e | 635 | if (install_new_value (existing, item->value, 0)) |
0cc7d26f | 636 | { |
0604393c SM |
637 | if (!type_updated && changed != NULL) |
638 | changed->push_back (existing); | |
0cc7d26f | 639 | } |
0604393c SM |
640 | else if (!type_updated && unchanged != NULL) |
641 | unchanged->push_back (existing); | |
0cc7d26f TT |
642 | } |
643 | } | |
644 | ||
576ea091 YQ |
645 | #if HAVE_PYTHON |
646 | ||
4c37490d | 647 | static bool |
b09e2c59 | 648 | dynamic_varobj_has_child_method (const struct varobj *var) |
0cc7d26f | 649 | { |
bb5ce47a | 650 | PyObject *printer = var->dynamic->pretty_printer; |
0cc7d26f | 651 | |
0646da15 | 652 | if (!gdb_python_initialized) |
4c37490d | 653 | return false; |
0646da15 | 654 | |
bde7b3e3 TT |
655 | gdbpy_enter_varobj enter_py (var); |
656 | return PyObject_HasAttr (printer, gdbpy_children_cst); | |
0cc7d26f | 657 | } |
576ea091 | 658 | #endif |
0cc7d26f | 659 | |
e5250216 YQ |
660 | /* A factory for creating dynamic varobj's iterators. Returns an |
661 | iterator object suitable for iterating over VAR's children. */ | |
662 | ||
24fd95b4 | 663 | static std::unique_ptr<varobj_iter> |
e5250216 YQ |
664 | varobj_get_iterator (struct varobj *var) |
665 | { | |
576ea091 | 666 | #if HAVE_PYTHON |
e5250216 YQ |
667 | if (var->dynamic->pretty_printer) |
668 | return py_varobj_get_iterator (var, var->dynamic->pretty_printer); | |
576ea091 | 669 | #endif |
e5250216 YQ |
670 | |
671 | gdb_assert_not_reached (_("\ | |
672 | requested an iterator from a non-dynamic varobj")); | |
673 | } | |
674 | ||
827f100c YQ |
675 | /* Release and clear VAR's saved item, if any. */ |
676 | ||
677 | static void | |
678 | varobj_clear_saved_item (struct varobj_dynamic *var) | |
679 | { | |
680 | if (var->saved_item != NULL) | |
681 | { | |
22bc8444 | 682 | value_decref (var->saved_item->value); |
74462664 | 683 | var->saved_item.reset (nullptr); |
827f100c YQ |
684 | } |
685 | } | |
0cc7d26f | 686 | |
4c37490d | 687 | static bool |
b6313243 | 688 | update_dynamic_varobj_children (struct varobj *var, |
0604393c SM |
689 | std::vector<varobj *> *changed, |
690 | std::vector<varobj *> *type_changed, | |
691 | std::vector<varobj *> *newobj, | |
692 | std::vector<varobj *> *unchanged, | |
4c37490d SM |
693 | bool *cchanged, |
694 | bool update_children, | |
0cc7d26f TT |
695 | int from, |
696 | int to) | |
b6313243 | 697 | { |
b6313243 | 698 | int i; |
b6313243 | 699 | |
4c37490d | 700 | *cchanged = false; |
b6313243 | 701 | |
bb5ce47a | 702 | if (update_children || var->dynamic->child_iter == NULL) |
b6313243 | 703 | { |
e5250216 | 704 | var->dynamic->child_iter = varobj_get_iterator (var); |
b6313243 | 705 | |
827f100c | 706 | varobj_clear_saved_item (var->dynamic); |
b6313243 | 707 | |
e5250216 | 708 | i = 0; |
b6313243 | 709 | |
bb5ce47a | 710 | if (var->dynamic->child_iter == NULL) |
4c37490d | 711 | return false; |
b6313243 | 712 | } |
0cc7d26f | 713 | else |
ddf0ea08 | 714 | i = var->children.size (); |
b6313243 | 715 | |
0cc7d26f TT |
716 | /* We ask for one extra child, so that MI can report whether there |
717 | are more children. */ | |
718 | for (; to < 0 || i < to + 1; ++i) | |
b6313243 | 719 | { |
60ee72f6 | 720 | std::unique_ptr<varobj_item> item; |
b6313243 | 721 | |
0cc7d26f | 722 | /* See if there was a leftover from last time. */ |
827f100c | 723 | if (var->dynamic->saved_item != NULL) |
74462664 | 724 | item = std::move (var->dynamic->saved_item); |
0cc7d26f | 725 | else |
a4c8e806 | 726 | { |
54746ce3 | 727 | item = var->dynamic->child_iter->next (); |
827f100c YQ |
728 | /* Release vitem->value so its lifetime is not bound to the |
729 | execution of a command. */ | |
730 | if (item != NULL && item->value != NULL) | |
895dafa6 | 731 | item->value = release_value (item->value).release (); |
a4c8e806 | 732 | } |
b6313243 | 733 | |
e5250216 YQ |
734 | if (item == NULL) |
735 | { | |
736 | /* Iteration is done. Remove iterator from VAR. */ | |
24fd95b4 | 737 | var->dynamic->child_iter.reset (nullptr); |
e5250216 YQ |
738 | break; |
739 | } | |
0cc7d26f TT |
740 | /* We don't want to push the extra child on any report list. */ |
741 | if (to < 0 || i < to) | |
b6313243 | 742 | { |
4c37490d | 743 | bool can_mention = from < 0 || i >= from; |
0cc7d26f | 744 | |
0cc7d26f | 745 | install_dynamic_child (var, can_mention ? changed : NULL, |
8264ba82 | 746 | can_mention ? type_changed : NULL, |
fe978cb0 | 747 | can_mention ? newobj : NULL, |
0cc7d26f | 748 | can_mention ? unchanged : NULL, |
5e5ac9a5 | 749 | can_mention ? cchanged : NULL, i, |
60ee72f6 | 750 | item.get ()); |
b6313243 | 751 | } |
0cc7d26f | 752 | else |
b6313243 | 753 | { |
74462664 | 754 | var->dynamic->saved_item = std::move (item); |
b6313243 | 755 | |
0cc7d26f TT |
756 | /* We want to truncate the child list just before this |
757 | element. */ | |
758 | break; | |
759 | } | |
b6313243 TT |
760 | } |
761 | ||
ddf0ea08 | 762 | if (i < var->children.size ()) |
b6313243 | 763 | { |
4c37490d | 764 | *cchanged = true; |
ddf0ea08 SM |
765 | for (int j = i; j < var->children.size (); ++j) |
766 | varobj_delete (var->children[j], 0); | |
767 | ||
768 | var->children.resize (i); | |
b6313243 | 769 | } |
0cc7d26f TT |
770 | |
771 | /* If there are fewer children than requested, note that the list of | |
772 | children changed. */ | |
ddf0ea08 | 773 | if (to >= 0 && var->children.size () < to) |
4c37490d | 774 | *cchanged = true; |
0cc7d26f | 775 | |
ddf0ea08 | 776 | var->num_children = var->children.size (); |
b6313243 | 777 | |
4c37490d | 778 | return true; |
b6313243 | 779 | } |
25d5ea92 | 780 | |
8b93c638 JM |
781 | int |
782 | varobj_get_num_children (struct varobj *var) | |
783 | { | |
784 | if (var->num_children == -1) | |
b6313243 | 785 | { |
31f628ae | 786 | if (varobj_is_dynamic_p (var)) |
0cc7d26f | 787 | { |
4c37490d | 788 | bool dummy; |
0cc7d26f TT |
789 | |
790 | /* If we have a dynamic varobj, don't report -1 children. | |
791 | So, try to fetch some children first. */ | |
8264ba82 | 792 | update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, &dummy, |
4c37490d | 793 | false, 0, 0); |
0cc7d26f TT |
794 | } |
795 | else | |
b6313243 TT |
796 | var->num_children = number_of_children (var); |
797 | } | |
8b93c638 | 798 | |
0cc7d26f | 799 | return var->num_children >= 0 ? var->num_children : 0; |
8b93c638 JM |
800 | } |
801 | ||
802 | /* Creates a list of the immediate children of a variable object; | |
581e13c1 | 803 | the return code is the number of such children or -1 on error. */ |
8b93c638 | 804 | |
ddf0ea08 | 805 | const std::vector<varobj *> & |
0cc7d26f | 806 | varobj_list_children (struct varobj *var, int *from, int *to) |
8b93c638 | 807 | { |
bd046f64 | 808 | var->dynamic->children_requested = true; |
b6313243 | 809 | |
31f628ae | 810 | if (varobj_is_dynamic_p (var)) |
0cc7d26f | 811 | { |
4c37490d SM |
812 | bool children_changed; |
813 | ||
b6313243 TT |
814 | /* This, in theory, can result in the number of children changing without |
815 | frontend noticing. But well, calling -var-list-children on the same | |
816 | varobj twice is not something a sane frontend would do. */ | |
8264ba82 | 817 | update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, |
4c37490d | 818 | &children_changed, false, 0, *to); |
99ad9427 | 819 | varobj_restrict_range (var->children, from, to); |
0cc7d26f TT |
820 | return var->children; |
821 | } | |
8b93c638 | 822 | |
8b93c638 JM |
823 | if (var->num_children == -1) |
824 | var->num_children = number_of_children (var); | |
825 | ||
74a44383 DJ |
826 | /* If that failed, give up. */ |
827 | if (var->num_children == -1) | |
d56d46f5 | 828 | return var->children; |
74a44383 | 829 | |
28335dcc VP |
830 | /* If we're called when the list of children is not yet initialized, |
831 | allocate enough elements in it. */ | |
ddf0ea08 SM |
832 | while (var->children.size () < var->num_children) |
833 | var->children.push_back (NULL); | |
28335dcc | 834 | |
ddf0ea08 | 835 | for (int i = 0; i < var->num_children; i++) |
8b93c638 | 836 | { |
ddf0ea08 | 837 | if (var->children[i] == NULL) |
28335dcc VP |
838 | { |
839 | /* Either it's the first call to varobj_list_children for | |
840 | this variable object, and the child was never created, | |
841 | or it was explicitly deleted by the client. */ | |
2f408ecb | 842 | std::string name = name_of_child (var, i); |
ddf0ea08 | 843 | var->children[i] = create_child (var, i, name); |
28335dcc | 844 | } |
8b93c638 JM |
845 | } |
846 | ||
99ad9427 | 847 | varobj_restrict_range (var->children, from, to); |
d56d46f5 | 848 | return var->children; |
8b93c638 JM |
849 | } |
850 | ||
b6313243 | 851 | static struct varobj * |
5a2e0d6e | 852 | varobj_add_child (struct varobj *var, struct varobj_item *item) |
b6313243 | 853 | { |
ddf0ea08 SM |
854 | varobj *v = create_child_with_value (var, var->children.size (), item); |
855 | ||
856 | var->children.push_back (v); | |
a109c7c1 | 857 | |
b6313243 TT |
858 | return v; |
859 | } | |
860 | ||
8b93c638 | 861 | /* Obtain the type of an object Variable as a string similar to the one gdb |
afa269ae SM |
862 | prints on the console. The caller is responsible for freeing the string. |
863 | */ | |
8b93c638 | 864 | |
2f408ecb | 865 | std::string |
8b93c638 JM |
866 | varobj_get_type (struct varobj *var) |
867 | { | |
8ab91b96 | 868 | /* For the "fake" variables, do not return a type. (Its type is |
8756216b DP |
869 | NULL, too.) |
870 | Do not return a type for invalid variables as well. */ | |
871 | if (CPLUS_FAKE_CHILD (var) || !var->root->is_valid) | |
2f408ecb | 872 | return std::string (); |
8b93c638 | 873 | |
1a4300e9 | 874 | return type_to_string (var->type); |
8b93c638 JM |
875 | } |
876 | ||
1ecb4ee0 DJ |
877 | /* Obtain the type of an object variable. */ |
878 | ||
879 | struct type * | |
b09e2c59 | 880 | varobj_get_gdb_type (const struct varobj *var) |
1ecb4ee0 DJ |
881 | { |
882 | return var->type; | |
883 | } | |
884 | ||
85254831 KS |
885 | /* Is VAR a path expression parent, i.e., can it be used to construct |
886 | a valid path expression? */ | |
887 | ||
4c37490d | 888 | static bool |
b09e2c59 | 889 | is_path_expr_parent (const struct varobj *var) |
85254831 | 890 | { |
9a9a7608 AB |
891 | gdb_assert (var->root->lang_ops->is_path_expr_parent != NULL); |
892 | return var->root->lang_ops->is_path_expr_parent (var); | |
893 | } | |
85254831 | 894 | |
9a9a7608 AB |
895 | /* Is VAR a path expression parent, i.e., can it be used to construct |
896 | a valid path expression? By default we assume any VAR can be a path | |
897 | parent. */ | |
85254831 | 898 | |
4c37490d | 899 | bool |
b09e2c59 | 900 | varobj_default_is_path_expr_parent (const struct varobj *var) |
9a9a7608 | 901 | { |
4c37490d | 902 | return true; |
85254831 KS |
903 | } |
904 | ||
905 | /* Return the path expression parent for VAR. */ | |
906 | ||
c1cc6152 SM |
907 | const struct varobj * |
908 | varobj_get_path_expr_parent (const struct varobj *var) | |
85254831 | 909 | { |
c1cc6152 | 910 | const struct varobj *parent = var; |
85254831 KS |
911 | |
912 | while (!is_root_p (parent) && !is_path_expr_parent (parent)) | |
913 | parent = parent->parent; | |
914 | ||
5abe0f0c JV |
915 | /* Computation of full rooted expression for children of dynamic |
916 | varobjs is not supported. */ | |
917 | if (varobj_is_dynamic_p (parent)) | |
918 | error (_("Invalid variable object (child of a dynamic varobj)")); | |
919 | ||
85254831 KS |
920 | return parent; |
921 | } | |
922 | ||
02142340 VP |
923 | /* Return a pointer to the full rooted expression of varobj VAR. |
924 | If it has not been computed yet, compute it. */ | |
2f408ecb PA |
925 | |
926 | const char * | |
c1cc6152 | 927 | varobj_get_path_expr (const struct varobj *var) |
02142340 | 928 | { |
2f408ecb | 929 | if (var->path_expr.empty ()) |
02142340 VP |
930 | { |
931 | /* For root varobjs, we initialize path_expr | |
932 | when creating varobj, so here it should be | |
933 | child varobj. */ | |
c1cc6152 | 934 | struct varobj *mutable_var = (struct varobj *) var; |
02142340 | 935 | gdb_assert (!is_root_p (var)); |
2568868e | 936 | |
c1cc6152 | 937 | mutable_var->path_expr = (*var->root->lang_ops->path_expr_of_child) (var); |
02142340 | 938 | } |
2568868e | 939 | |
2f408ecb | 940 | return var->path_expr.c_str (); |
02142340 VP |
941 | } |
942 | ||
fa4d0c40 | 943 | const struct language_defn * |
b09e2c59 | 944 | varobj_get_language (const struct varobj *var) |
8b93c638 | 945 | { |
fa4d0c40 | 946 | return var->root->exp->language_defn; |
8b93c638 JM |
947 | } |
948 | ||
949 | int | |
b09e2c59 | 950 | varobj_get_attributes (const struct varobj *var) |
8b93c638 JM |
951 | { |
952 | int attributes = 0; | |
953 | ||
340a7723 | 954 | if (varobj_editable_p (var)) |
581e13c1 | 955 | /* FIXME: define masks for attributes. */ |
8b93c638 JM |
956 | attributes |= 0x00000001; /* Editable */ |
957 | ||
958 | return attributes; | |
959 | } | |
960 | ||
cde5ef40 YQ |
961 | /* Return true if VAR is a dynamic varobj. */ |
962 | ||
4c37490d | 963 | bool |
b09e2c59 | 964 | varobj_is_dynamic_p (const struct varobj *var) |
0cc7d26f | 965 | { |
bb5ce47a | 966 | return var->dynamic->pretty_printer != NULL; |
0cc7d26f TT |
967 | } |
968 | ||
2f408ecb | 969 | std::string |
de051565 MK |
970 | varobj_get_formatted_value (struct varobj *var, |
971 | enum varobj_display_formats format) | |
972 | { | |
973 | return my_value_of_variable (var, format); | |
974 | } | |
975 | ||
2f408ecb | 976 | std::string |
8b93c638 JM |
977 | varobj_get_value (struct varobj *var) |
978 | { | |
de051565 | 979 | return my_value_of_variable (var, var->format); |
8b93c638 JM |
980 | } |
981 | ||
982 | /* Set the value of an object variable (if it is editable) to the | |
581e13c1 MS |
983 | value of the given expression. */ |
984 | /* Note: Invokes functions that can call error(). */ | |
8b93c638 | 985 | |
4c37490d | 986 | bool |
2f408ecb | 987 | varobj_set_value (struct varobj *var, const char *expression) |
8b93c638 | 988 | { |
34365054 | 989 | struct value *val = NULL; /* Initialize to keep gcc happy. */ |
8b93c638 | 990 | /* The argument "expression" contains the variable's new value. |
581e13c1 MS |
991 | We need to first construct a legal expression for this -- ugh! */ |
992 | /* Does this cover all the bases? */ | |
34365054 | 993 | struct value *value = NULL; /* Initialize to keep gcc happy. */ |
8b93c638 | 994 | int saved_input_radix = input_radix; |
bbc13ae3 | 995 | const char *s = expression; |
8b93c638 | 996 | |
340a7723 | 997 | gdb_assert (varobj_editable_p (var)); |
8b93c638 | 998 | |
581e13c1 | 999 | input_radix = 10; /* ALWAYS reset to decimal temporarily. */ |
4d01a485 | 1000 | expression_up exp = parse_exp_1 (&s, 0, 0, 0); |
a70b8144 | 1001 | try |
8e7b59a5 | 1002 | { |
4d01a485 | 1003 | value = evaluate_expression (exp.get ()); |
8e7b59a5 KS |
1004 | } |
1005 | ||
230d2906 | 1006 | catch (const gdb_exception_error &except) |
340a7723 | 1007 | { |
581e13c1 | 1008 | /* We cannot proceed without a valid expression. */ |
4c37490d | 1009 | return false; |
8b93c638 JM |
1010 | } |
1011 | ||
340a7723 NR |
1012 | /* All types that are editable must also be changeable. */ |
1013 | gdb_assert (varobj_value_is_changeable_p (var)); | |
1014 | ||
1015 | /* The value of a changeable variable object must not be lazy. */ | |
b4d61099 | 1016 | gdb_assert (!value_lazy (var->value.get ())); |
340a7723 NR |
1017 | |
1018 | /* Need to coerce the input. We want to check if the | |
1019 | value of the variable object will be different | |
1020 | after assignment, and the first thing value_assign | |
1021 | does is coerce the input. | |
1022 | For example, if we are assigning an array to a pointer variable we | |
b021a221 | 1023 | should compare the pointer with the array's address, not with the |
340a7723 NR |
1024 | array's content. */ |
1025 | value = coerce_array (value); | |
1026 | ||
8e7b59a5 KS |
1027 | /* The new value may be lazy. value_assign, or |
1028 | rather value_contents, will take care of this. */ | |
a70b8144 | 1029 | try |
8e7b59a5 | 1030 | { |
b4d61099 | 1031 | val = value_assign (var->value.get (), value); |
8e7b59a5 KS |
1032 | } |
1033 | ||
230d2906 | 1034 | catch (const gdb_exception_error &except) |
492d29ea | 1035 | { |
4c37490d | 1036 | return false; |
492d29ea | 1037 | } |
8e7b59a5 | 1038 | |
340a7723 NR |
1039 | /* If the value has changed, record it, so that next -var-update can |
1040 | report this change. If a variable had a value of '1', we've set it | |
1041 | to '333' and then set again to '1', when -var-update will report this | |
1042 | variable as changed -- because the first assignment has set the | |
1043 | 'updated' flag. There's no need to optimize that, because return value | |
1044 | of -var-update should be considered an approximation. */ | |
4c37490d | 1045 | var->updated = install_new_value (var, val, false /* Compare values. */); |
340a7723 | 1046 | input_radix = saved_input_radix; |
4c37490d | 1047 | return true; |
8b93c638 JM |
1048 | } |
1049 | ||
0cc7d26f TT |
1050 | #if HAVE_PYTHON |
1051 | ||
1052 | /* A helper function to install a constructor function and visualizer | |
bb5ce47a | 1053 | in a varobj_dynamic. */ |
0cc7d26f TT |
1054 | |
1055 | static void | |
bb5ce47a | 1056 | install_visualizer (struct varobj_dynamic *var, PyObject *constructor, |
0cc7d26f TT |
1057 | PyObject *visualizer) |
1058 | { | |
1059 | Py_XDECREF (var->constructor); | |
1060 | var->constructor = constructor; | |
1061 | ||
1062 | Py_XDECREF (var->pretty_printer); | |
1063 | var->pretty_printer = visualizer; | |
1064 | ||
24fd95b4 | 1065 | var->child_iter.reset (nullptr); |
0cc7d26f TT |
1066 | } |
1067 | ||
1068 | /* Install the default visualizer for VAR. */ | |
1069 | ||
1070 | static void | |
1071 | install_default_visualizer (struct varobj *var) | |
1072 | { | |
d65aec65 PM |
1073 | /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
1074 | if (CPLUS_FAKE_CHILD (var)) | |
1075 | return; | |
1076 | ||
0cc7d26f TT |
1077 | if (pretty_printing) |
1078 | { | |
a31abe80 | 1079 | gdbpy_ref<> pretty_printer; |
0cc7d26f | 1080 | |
b4d61099 | 1081 | if (var->value != nullptr) |
0cc7d26f | 1082 | { |
b4d61099 | 1083 | pretty_printer = gdbpy_get_varobj_pretty_printer (var->value.get ()); |
a31abe80 | 1084 | if (pretty_printer == nullptr) |
0cc7d26f TT |
1085 | { |
1086 | gdbpy_print_stack (); | |
1087 | error (_("Cannot instantiate printer for default visualizer")); | |
1088 | } | |
1089 | } | |
a31abe80 | 1090 | |
0cc7d26f | 1091 | if (pretty_printer == Py_None) |
895dafa6 | 1092 | pretty_printer.reset (nullptr); |
0cc7d26f | 1093 | |
a31abe80 | 1094 | install_visualizer (var->dynamic, NULL, pretty_printer.release ()); |
0cc7d26f TT |
1095 | } |
1096 | } | |
1097 | ||
1098 | /* Instantiate and install a visualizer for VAR using CONSTRUCTOR to | |
1099 | make a new object. */ | |
1100 | ||
1101 | static void | |
1102 | construct_visualizer (struct varobj *var, PyObject *constructor) | |
1103 | { | |
1104 | PyObject *pretty_printer; | |
1105 | ||
d65aec65 PM |
1106 | /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
1107 | if (CPLUS_FAKE_CHILD (var)) | |
1108 | return; | |
1109 | ||
0cc7d26f TT |
1110 | Py_INCREF (constructor); |
1111 | if (constructor == Py_None) | |
1112 | pretty_printer = NULL; | |
1113 | else | |
1114 | { | |
b4d61099 TT |
1115 | pretty_printer = instantiate_pretty_printer (constructor, |
1116 | var->value.get ()); | |
0cc7d26f TT |
1117 | if (! pretty_printer) |
1118 | { | |
1119 | gdbpy_print_stack (); | |
1120 | Py_DECREF (constructor); | |
1121 | constructor = Py_None; | |
1122 | Py_INCREF (constructor); | |
1123 | } | |
1124 | ||
1125 | if (pretty_printer == Py_None) | |
1126 | { | |
1127 | Py_DECREF (pretty_printer); | |
1128 | pretty_printer = NULL; | |
1129 | } | |
1130 | } | |
1131 | ||
bb5ce47a | 1132 | install_visualizer (var->dynamic, constructor, pretty_printer); |
0cc7d26f TT |
1133 | } |
1134 | ||
1135 | #endif /* HAVE_PYTHON */ | |
1136 | ||
1137 | /* A helper function for install_new_value. This creates and installs | |
1138 | a visualizer for VAR, if appropriate. */ | |
1139 | ||
1140 | static void | |
1141 | install_new_value_visualizer (struct varobj *var) | |
1142 | { | |
1143 | #if HAVE_PYTHON | |
1144 | /* If the constructor is None, then we want the raw value. If VAR | |
1145 | does not have a value, just skip this. */ | |
0646da15 TT |
1146 | if (!gdb_python_initialized) |
1147 | return; | |
1148 | ||
bb5ce47a | 1149 | if (var->dynamic->constructor != Py_None && var->value != NULL) |
0cc7d26f | 1150 | { |
bde7b3e3 | 1151 | gdbpy_enter_varobj enter_py (var); |
0cc7d26f | 1152 | |
bb5ce47a | 1153 | if (var->dynamic->constructor == NULL) |
0cc7d26f TT |
1154 | install_default_visualizer (var); |
1155 | else | |
bb5ce47a | 1156 | construct_visualizer (var, var->dynamic->constructor); |
0cc7d26f TT |
1157 | } |
1158 | #else | |
1159 | /* Do nothing. */ | |
1160 | #endif | |
1161 | } | |
1162 | ||
8264ba82 AG |
1163 | /* When using RTTI to determine variable type it may be changed in runtime when |
1164 | the variable value is changed. This function checks whether type of varobj | |
1165 | VAR will change when a new value NEW_VALUE is assigned and if it is so | |
1166 | updates the type of VAR. */ | |
1167 | ||
4c37490d | 1168 | static bool |
8264ba82 AG |
1169 | update_type_if_necessary (struct varobj *var, struct value *new_value) |
1170 | { | |
1171 | if (new_value) | |
1172 | { | |
1173 | struct value_print_options opts; | |
1174 | ||
1175 | get_user_print_options (&opts); | |
1176 | if (opts.objectprint) | |
1177 | { | |
2f408ecb PA |
1178 | struct type *new_type = value_actual_type (new_value, 0, 0); |
1179 | std::string new_type_str = type_to_string (new_type); | |
1180 | std::string curr_type_str = varobj_get_type (var); | |
8264ba82 | 1181 | |
2f408ecb PA |
1182 | /* Did the type name change? */ |
1183 | if (curr_type_str != new_type_str) | |
8264ba82 AG |
1184 | { |
1185 | var->type = new_type; | |
1186 | ||
1187 | /* This information may be not valid for a new type. */ | |
30914ca8 | 1188 | varobj_delete (var, 1); |
ddf0ea08 | 1189 | var->children.clear (); |
8264ba82 | 1190 | var->num_children = -1; |
4c37490d | 1191 | return true; |
8264ba82 AG |
1192 | } |
1193 | } | |
1194 | } | |
1195 | ||
4c37490d | 1196 | return false; |
8264ba82 AG |
1197 | } |
1198 | ||
4c37490d SM |
1199 | /* Assign a new value to a variable object. If INITIAL is true, |
1200 | this is the first assignment after the variable object was just | |
acd65feb | 1201 | created, or changed type. In that case, just assign the value |
4c37490d SM |
1202 | and return false. |
1203 | Otherwise, assign the new value, and return true if the value is | |
1204 | different from the current one, false otherwise. The comparison is | |
581e13c1 MS |
1205 | done on textual representation of value. Therefore, some types |
1206 | need not be compared. E.g. for structures the reported value is | |
1207 | always "{...}", so no comparison is necessary here. If the old | |
4c37490d | 1208 | value was NULL and new one is not, or vice versa, we always return true. |
b26ed50d VP |
1209 | |
1210 | The VALUE parameter should not be released -- the function will | |
1211 | take care of releasing it when needed. */ | |
4c37490d SM |
1212 | static bool |
1213 | install_new_value (struct varobj *var, struct value *value, bool initial) | |
acd65feb | 1214 | { |
4c37490d SM |
1215 | bool changeable; |
1216 | bool need_to_fetch; | |
1217 | bool changed = false; | |
1218 | bool intentionally_not_fetched = false; | |
acd65feb | 1219 | |
acd65feb | 1220 | /* We need to know the varobj's type to decide if the value should |
3e43a32a | 1221 | be fetched or not. C++ fake children (public/protected/private) |
581e13c1 | 1222 | don't have a type. */ |
acd65feb | 1223 | gdb_assert (var->type || CPLUS_FAKE_CHILD (var)); |
b2c2bd75 | 1224 | changeable = varobj_value_is_changeable_p (var); |
b6313243 TT |
1225 | |
1226 | /* If the type has custom visualizer, we consider it to be always | |
581e13c1 | 1227 | changeable. FIXME: need to make sure this behaviour will not |
b6313243 | 1228 | mess up read-sensitive values. */ |
bb5ce47a | 1229 | if (var->dynamic->pretty_printer != NULL) |
4c37490d | 1230 | changeable = true; |
b6313243 | 1231 | |
acd65feb VP |
1232 | need_to_fetch = changeable; |
1233 | ||
b26ed50d VP |
1234 | /* We are not interested in the address of references, and given |
1235 | that in C++ a reference is not rebindable, it cannot | |
1236 | meaningfully change. So, get hold of the real value. */ | |
1237 | if (value) | |
0cc7d26f | 1238 | value = coerce_ref (value); |
b26ed50d | 1239 | |
78134374 | 1240 | if (var->type && var->type->code () == TYPE_CODE_UNION) |
acd65feb VP |
1241 | /* For unions, we need to fetch the value implicitly because |
1242 | of implementation of union member fetch. When gdb | |
1243 | creates a value for a field and the value of the enclosing | |
1244 | structure is not lazy, it immediately copies the necessary | |
1245 | bytes from the enclosing values. If the enclosing value is | |
1246 | lazy, the call to value_fetch_lazy on the field will read | |
1247 | the data from memory. For unions, that means we'll read the | |
1248 | same memory more than once, which is not desirable. So | |
1249 | fetch now. */ | |
4c37490d | 1250 | need_to_fetch = true; |
acd65feb VP |
1251 | |
1252 | /* The new value might be lazy. If the type is changeable, | |
1253 | that is we'll be comparing values of this type, fetch the | |
1254 | value now. Otherwise, on the next update the old value | |
1255 | will be lazy, which means we've lost that old value. */ | |
1256 | if (need_to_fetch && value && value_lazy (value)) | |
1257 | { | |
c1cc6152 | 1258 | const struct varobj *parent = var->parent; |
4c37490d | 1259 | bool frozen = var->frozen; |
a109c7c1 | 1260 | |
25d5ea92 VP |
1261 | for (; !frozen && parent; parent = parent->parent) |
1262 | frozen |= parent->frozen; | |
1263 | ||
1264 | if (frozen && initial) | |
1265 | { | |
1266 | /* For variables that are frozen, or are children of frozen | |
1267 | variables, we don't do fetch on initial assignment. | |
30baf67b | 1268 | For non-initial assignment we do the fetch, since it means we're |
25d5ea92 | 1269 | explicitly asked to compare the new value with the old one. */ |
4c37490d | 1270 | intentionally_not_fetched = true; |
25d5ea92 | 1271 | } |
8e7b59a5 | 1272 | else |
acd65feb | 1273 | { |
8e7b59a5 | 1274 | |
a70b8144 | 1275 | try |
8e7b59a5 KS |
1276 | { |
1277 | value_fetch_lazy (value); | |
1278 | } | |
1279 | ||
230d2906 | 1280 | catch (const gdb_exception_error &except) |
8e7b59a5 KS |
1281 | { |
1282 | /* Set the value to NULL, so that for the next -var-update, | |
1283 | we don't try to compare the new value with this value, | |
1284 | that we couldn't even read. */ | |
1285 | value = NULL; | |
1286 | } | |
acd65feb | 1287 | } |
acd65feb VP |
1288 | } |
1289 | ||
e848a8a5 TT |
1290 | /* Get a reference now, before possibly passing it to any Python |
1291 | code that might release it. */ | |
b4d61099 | 1292 | value_ref_ptr value_holder; |
e848a8a5 | 1293 | if (value != NULL) |
bbfa6f00 | 1294 | value_holder = value_ref_ptr::new_reference (value); |
b6313243 | 1295 | |
7a4d50bf VP |
1296 | /* Below, we'll be comparing string rendering of old and new |
1297 | values. Don't get string rendering if the value is | |
1298 | lazy -- if it is, the code above has decided that the value | |
1299 | should not be fetched. */ | |
2f408ecb | 1300 | std::string print_value; |
bb5ce47a YQ |
1301 | if (value != NULL && !value_lazy (value) |
1302 | && var->dynamic->pretty_printer == NULL) | |
99ad9427 | 1303 | print_value = varobj_value_get_print_value (value, var->format, var); |
7a4d50bf | 1304 | |
acd65feb VP |
1305 | /* If the type is changeable, compare the old and the new values. |
1306 | If this is the initial assignment, we don't have any old value | |
1307 | to compare with. */ | |
7a4d50bf | 1308 | if (!initial && changeable) |
acd65feb | 1309 | { |
3e43a32a MS |
1310 | /* If the value of the varobj was changed by -var-set-value, |
1311 | then the value in the varobj and in the target is the same. | |
1312 | However, that value is different from the value that the | |
581e13c1 | 1313 | varobj had after the previous -var-update. So need to the |
3e43a32a | 1314 | varobj as changed. */ |
acd65feb | 1315 | if (var->updated) |
4c37490d | 1316 | changed = true; |
bb5ce47a | 1317 | else if (var->dynamic->pretty_printer == NULL) |
acd65feb VP |
1318 | { |
1319 | /* Try to compare the values. That requires that both | |
1320 | values are non-lazy. */ | |
b4d61099 | 1321 | if (var->not_fetched && value_lazy (var->value.get ())) |
25d5ea92 VP |
1322 | { |
1323 | /* This is a frozen varobj and the value was never read. | |
1324 | Presumably, UI shows some "never read" indicator. | |
1325 | Now that we've fetched the real value, we need to report | |
1326 | this varobj as changed so that UI can show the real | |
1327 | value. */ | |
4c37490d | 1328 | changed = true; |
25d5ea92 | 1329 | } |
dda83cd7 | 1330 | else if (var->value == NULL && value == NULL) |
581e13c1 | 1331 | /* Equal. */ |
acd65feb VP |
1332 | ; |
1333 | else if (var->value == NULL || value == NULL) | |
57e66780 | 1334 | { |
4c37490d | 1335 | changed = true; |
57e66780 | 1336 | } |
acd65feb VP |
1337 | else |
1338 | { | |
b4d61099 | 1339 | gdb_assert (!value_lazy (var->value.get ())); |
acd65feb | 1340 | gdb_assert (!value_lazy (value)); |
85265413 | 1341 | |
2f408ecb PA |
1342 | gdb_assert (!var->print_value.empty () && !print_value.empty ()); |
1343 | if (var->print_value != print_value) | |
4c37490d | 1344 | changed = true; |
acd65feb VP |
1345 | } |
1346 | } | |
1347 | } | |
85265413 | 1348 | |
ee342b23 VP |
1349 | if (!initial && !changeable) |
1350 | { | |
1351 | /* For values that are not changeable, we don't compare the values. | |
1352 | However, we want to notice if a value was not NULL and now is NULL, | |
1353 | or vise versa, so that we report when top-level varobjs come in scope | |
1354 | and leave the scope. */ | |
1355 | changed = (var->value != NULL) != (value != NULL); | |
1356 | } | |
1357 | ||
acd65feb | 1358 | /* We must always keep the new value, since children depend on it. */ |
b4d61099 | 1359 | var->value = value_holder; |
25d5ea92 | 1360 | if (value && value_lazy (value) && intentionally_not_fetched) |
4c37490d | 1361 | var->not_fetched = true; |
25d5ea92 | 1362 | else |
4c37490d SM |
1363 | var->not_fetched = false; |
1364 | var->updated = false; | |
85265413 | 1365 | |
0cc7d26f TT |
1366 | install_new_value_visualizer (var); |
1367 | ||
1368 | /* If we installed a pretty-printer, re-compare the printed version | |
1369 | to see if the variable changed. */ | |
bb5ce47a | 1370 | if (var->dynamic->pretty_printer != NULL) |
0cc7d26f | 1371 | { |
b4d61099 TT |
1372 | print_value = varobj_value_get_print_value (var->value.get (), |
1373 | var->format, var); | |
2f408ecb PA |
1374 | if ((var->print_value.empty () && !print_value.empty ()) |
1375 | || (!var->print_value.empty () && print_value.empty ()) | |
1376 | || (!var->print_value.empty () && !print_value.empty () | |
1377 | && var->print_value != print_value)) | |
4c37490d | 1378 | changed = true; |
0cc7d26f | 1379 | } |
0cc7d26f TT |
1380 | var->print_value = print_value; |
1381 | ||
b4d61099 | 1382 | gdb_assert (var->value == nullptr || value_type (var->value.get ())); |
acd65feb VP |
1383 | |
1384 | return changed; | |
1385 | } | |
acd65feb | 1386 | |
0cc7d26f TT |
1387 | /* Return the requested range for a varobj. VAR is the varobj. FROM |
1388 | and TO are out parameters; *FROM and *TO will be set to the | |
1389 | selected sub-range of VAR. If no range was selected using | |
1390 | -var-set-update-range, then both will be -1. */ | |
1391 | void | |
b09e2c59 | 1392 | varobj_get_child_range (const struct varobj *var, int *from, int *to) |
b6313243 | 1393 | { |
0cc7d26f TT |
1394 | *from = var->from; |
1395 | *to = var->to; | |
b6313243 TT |
1396 | } |
1397 | ||
0cc7d26f TT |
1398 | /* Set the selected sub-range of children of VAR to start at index |
1399 | FROM and end at index TO. If either FROM or TO is less than zero, | |
1400 | this is interpreted as a request for all children. */ | |
1401 | void | |
1402 | varobj_set_child_range (struct varobj *var, int from, int to) | |
b6313243 | 1403 | { |
0cc7d26f TT |
1404 | var->from = from; |
1405 | var->to = to; | |
b6313243 TT |
1406 | } |
1407 | ||
1408 | void | |
1409 | varobj_set_visualizer (struct varobj *var, const char *visualizer) | |
1410 | { | |
1411 | #if HAVE_PYTHON | |
bde7b3e3 | 1412 | PyObject *mainmod; |
b6313243 | 1413 | |
0646da15 TT |
1414 | if (!gdb_python_initialized) |
1415 | return; | |
1416 | ||
bde7b3e3 | 1417 | gdbpy_enter_varobj enter_py (var); |
b6313243 TT |
1418 | |
1419 | mainmod = PyImport_AddModule ("__main__"); | |
7c66fffc TT |
1420 | gdbpy_ref<> globals |
1421 | = gdbpy_ref<>::new_reference (PyModule_GetDict (mainmod)); | |
7780f186 TT |
1422 | gdbpy_ref<> constructor (PyRun_String (visualizer, Py_eval_input, |
1423 | globals.get (), globals.get ())); | |
b6313243 | 1424 | |
bde7b3e3 | 1425 | if (constructor == NULL) |
b6313243 TT |
1426 | { |
1427 | gdbpy_print_stack (); | |
da1f2771 | 1428 | error (_("Could not evaluate visualizer expression: %s"), visualizer); |
b6313243 TT |
1429 | } |
1430 | ||
bde7b3e3 | 1431 | construct_visualizer (var, constructor.get ()); |
b6313243 | 1432 | |
0cc7d26f | 1433 | /* If there are any children now, wipe them. */ |
30914ca8 | 1434 | varobj_delete (var, 1 /* children only */); |
0cc7d26f | 1435 | var->num_children = -1; |
b6313243 | 1436 | #else |
da1f2771 | 1437 | error (_("Python support required")); |
b6313243 TT |
1438 | #endif |
1439 | } | |
1440 | ||
7a290c40 | 1441 | /* If NEW_VALUE is the new value of the given varobj (var), return |
4c37490d | 1442 | true if var has mutated. In other words, if the type of |
7a290c40 JB |
1443 | the new value is different from the type of the varobj's old |
1444 | value. | |
1445 | ||
1446 | NEW_VALUE may be NULL, if the varobj is now out of scope. */ | |
1447 | ||
4c37490d | 1448 | static bool |
b09e2c59 | 1449 | varobj_value_has_mutated (const struct varobj *var, struct value *new_value, |
7a290c40 JB |
1450 | struct type *new_type) |
1451 | { | |
1452 | /* If we haven't previously computed the number of children in var, | |
1453 | it does not matter from the front-end's perspective whether | |
1454 | the type has mutated or not. For all intents and purposes, | |
1455 | it has not mutated. */ | |
1456 | if (var->num_children < 0) | |
4c37490d | 1457 | return false; |
7a290c40 | 1458 | |
4c37490d | 1459 | if (var->root->lang_ops->value_has_mutated != NULL) |
8776cfe9 JB |
1460 | { |
1461 | /* The varobj module, when installing new values, explicitly strips | |
1462 | references, saying that we're not interested in those addresses. | |
1463 | But detection of mutation happens before installing the new | |
1464 | value, so our value may be a reference that we need to strip | |
1465 | in order to remain consistent. */ | |
1466 | if (new_value != NULL) | |
1467 | new_value = coerce_ref (new_value); | |
1468 | return var->root->lang_ops->value_has_mutated (var, new_value, new_type); | |
1469 | } | |
7a290c40 | 1470 | else |
4c37490d | 1471 | return false; |
7a290c40 JB |
1472 | } |
1473 | ||
8b93c638 JM |
1474 | /* Update the values for a variable and its children. This is a |
1475 | two-pronged attack. First, re-parse the value for the root's | |
1476 | expression to see if it's changed. Then go all the way | |
1477 | through its children, reconstructing them and noting if they've | |
1478 | changed. | |
1479 | ||
4c37490d | 1480 | The IS_EXPLICIT parameter specifies if this call is result |
25d5ea92 | 1481 | of MI request to update this specific variable, or |
581e13c1 | 1482 | result of implicit -var-update *. For implicit request, we don't |
25d5ea92 | 1483 | update frozen variables. |
705da579 | 1484 | |
581e13c1 | 1485 | NOTE: This function may delete the caller's varobj. If it |
8756216b DP |
1486 | returns TYPE_CHANGED, then it has done this and VARP will be modified |
1487 | to point to the new varobj. */ | |
8b93c638 | 1488 | |
0604393c | 1489 | std::vector<varobj_update_result> |
4c37490d | 1490 | varobj_update (struct varobj **varp, bool is_explicit) |
8b93c638 | 1491 | { |
4c37490d | 1492 | bool type_changed = false; |
fe978cb0 | 1493 | struct value *newobj; |
0604393c SM |
1494 | std::vector<varobj_update_result> stack; |
1495 | std::vector<varobj_update_result> result; | |
8b93c638 | 1496 | |
25d5ea92 VP |
1497 | /* Frozen means frozen -- we don't check for any change in |
1498 | this varobj, including its going out of scope, or | |
1499 | changing type. One use case for frozen varobjs is | |
1500 | retaining previously evaluated expressions, and we don't | |
1501 | want them to be reevaluated at all. */ | |
fe978cb0 | 1502 | if (!is_explicit && (*varp)->frozen) |
f7f9ae2c | 1503 | return result; |
8756216b DP |
1504 | |
1505 | if (!(*varp)->root->is_valid) | |
f7f9ae2c | 1506 | { |
0604393c | 1507 | result.emplace_back (*varp, VAROBJ_INVALID); |
f7f9ae2c VP |
1508 | return result; |
1509 | } | |
8b93c638 | 1510 | |
25d5ea92 | 1511 | if ((*varp)->root->rootvar == *varp) |
ae093f96 | 1512 | { |
0604393c | 1513 | varobj_update_result r (*varp); |
f7f9ae2c | 1514 | |
581e13c1 | 1515 | /* Update the root variable. value_of_root can return NULL |
25d5ea92 | 1516 | if the variable is no longer around, i.e. we stepped out of |
581e13c1 | 1517 | the frame in which a local existed. We are letting the |
25d5ea92 VP |
1518 | value_of_root variable dispose of the varobj if the type |
1519 | has changed. */ | |
fe978cb0 | 1520 | newobj = value_of_root (varp, &type_changed); |
4c37490d SM |
1521 | if (update_type_if_necessary (*varp, newobj)) |
1522 | type_changed = true; | |
f7f9ae2c | 1523 | r.varobj = *varp; |
f7f9ae2c | 1524 | r.type_changed = type_changed; |
fe978cb0 | 1525 | if (install_new_value ((*varp), newobj, type_changed)) |
4c37490d | 1526 | r.changed = true; |
ea56f9c2 | 1527 | |
fe978cb0 | 1528 | if (newobj == NULL) |
f7f9ae2c | 1529 | r.status = VAROBJ_NOT_IN_SCOPE; |
4c37490d | 1530 | r.value_installed = true; |
f7f9ae2c VP |
1531 | |
1532 | if (r.status == VAROBJ_NOT_IN_SCOPE) | |
b6313243 | 1533 | { |
0b4bc29a | 1534 | if (r.type_changed || r.changed) |
0604393c SM |
1535 | result.push_back (std::move (r)); |
1536 | ||
b6313243 TT |
1537 | return result; |
1538 | } | |
a109c7c1 | 1539 | |
0604393c | 1540 | stack.push_back (std::move (r)); |
b20d8971 | 1541 | } |
0604393c SM |
1542 | else |
1543 | stack.emplace_back (*varp); | |
8b93c638 | 1544 | |
8756216b | 1545 | /* Walk through the children, reconstructing them all. */ |
0604393c | 1546 | while (!stack.empty ()) |
8b93c638 | 1547 | { |
0604393c SM |
1548 | varobj_update_result r = std::move (stack.back ()); |
1549 | stack.pop_back (); | |
b6313243 TT |
1550 | struct varobj *v = r.varobj; |
1551 | ||
b6313243 TT |
1552 | /* Update this variable, unless it's a root, which is already |
1553 | updated. */ | |
1554 | if (!r.value_installed) | |
7a290c40 JB |
1555 | { |
1556 | struct type *new_type; | |
1557 | ||
fe978cb0 | 1558 | newobj = value_of_child (v->parent, v->index); |
4c37490d SM |
1559 | if (update_type_if_necessary (v, newobj)) |
1560 | r.type_changed = true; | |
fe978cb0 PA |
1561 | if (newobj) |
1562 | new_type = value_type (newobj); | |
7a290c40 | 1563 | else |
ca20d462 | 1564 | new_type = v->root->lang_ops->type_of_child (v->parent, v->index); |
7a290c40 | 1565 | |
fe978cb0 | 1566 | if (varobj_value_has_mutated (v, newobj, new_type)) |
7a290c40 JB |
1567 | { |
1568 | /* The children are no longer valid; delete them now. | |
dda83cd7 | 1569 | Report the fact that its type changed as well. */ |
30914ca8 | 1570 | varobj_delete (v, 1 /* only_children */); |
7a290c40 JB |
1571 | v->num_children = -1; |
1572 | v->to = -1; | |
1573 | v->from = -1; | |
1574 | v->type = new_type; | |
4c37490d | 1575 | r.type_changed = true; |
7a290c40 JB |
1576 | } |
1577 | ||
fe978cb0 | 1578 | if (install_new_value (v, newobj, r.type_changed)) |
b6313243 | 1579 | { |
4c37490d SM |
1580 | r.changed = true; |
1581 | v->updated = false; | |
b6313243 TT |
1582 | } |
1583 | } | |
1584 | ||
31f628ae YQ |
1585 | /* We probably should not get children of a dynamic varobj, but |
1586 | for which -var-list-children was never invoked. */ | |
1587 | if (varobj_is_dynamic_p (v)) | |
b6313243 | 1588 | { |
b926417a | 1589 | std::vector<varobj *> changed, type_changed_vec, unchanged, newobj_vec; |
4c37490d | 1590 | bool children_changed = false; |
b6313243 TT |
1591 | |
1592 | if (v->frozen) | |
1593 | continue; | |
1594 | ||
bd046f64 | 1595 | if (!v->dynamic->children_requested) |
0cc7d26f | 1596 | { |
4c37490d | 1597 | bool dummy; |
0cc7d26f TT |
1598 | |
1599 | /* If we initially did not have potential children, but | |
1600 | now we do, consider the varobj as changed. | |
1601 | Otherwise, if children were never requested, consider | |
1602 | it as unchanged -- presumably, such varobj is not yet | |
1603 | expanded in the UI, so we need not bother getting | |
1604 | it. */ | |
1605 | if (!varobj_has_more (v, 0)) | |
1606 | { | |
8264ba82 | 1607 | update_dynamic_varobj_children (v, NULL, NULL, NULL, NULL, |
4c37490d | 1608 | &dummy, false, 0, 0); |
0cc7d26f | 1609 | if (varobj_has_more (v, 0)) |
4c37490d | 1610 | r.changed = true; |
0cc7d26f TT |
1611 | } |
1612 | ||
1613 | if (r.changed) | |
0604393c | 1614 | result.push_back (std::move (r)); |
0cc7d26f TT |
1615 | |
1616 | continue; | |
1617 | } | |
1618 | ||
4c37490d | 1619 | /* If update_dynamic_varobj_children returns false, then we have |
b6313243 | 1620 | a non-conforming pretty-printer, so we skip it. */ |
b926417a TT |
1621 | if (update_dynamic_varobj_children (v, &changed, &type_changed_vec, |
1622 | &newobj_vec, | |
1623 | &unchanged, &children_changed, | |
1624 | true, v->from, v->to)) | |
b6313243 | 1625 | { |
b926417a | 1626 | if (children_changed || !newobj_vec.empty ()) |
b6313243 | 1627 | { |
4c37490d | 1628 | r.children_changed = true; |
b926417a | 1629 | r.newobj = std::move (newobj_vec); |
b6313243 | 1630 | } |
0cc7d26f TT |
1631 | /* Push in reverse order so that the first child is |
1632 | popped from the work stack first, and so will be | |
1633 | added to result first. This does not affect | |
1634 | correctness, just "nicer". */ | |
b926417a | 1635 | for (int i = type_changed_vec.size () - 1; i >= 0; --i) |
8264ba82 | 1636 | { |
b926417a | 1637 | varobj_update_result item (type_changed_vec[i]); |
8264ba82 AG |
1638 | |
1639 | /* Type may change only if value was changed. */ | |
b926417a TT |
1640 | item.changed = true; |
1641 | item.type_changed = true; | |
1642 | item.value_installed = true; | |
0604393c | 1643 | |
b926417a | 1644 | stack.push_back (std::move (item)); |
8264ba82 | 1645 | } |
0604393c | 1646 | for (int i = changed.size () - 1; i >= 0; --i) |
b6313243 | 1647 | { |
b926417a | 1648 | varobj_update_result item (changed[i]); |
a109c7c1 | 1649 | |
b926417a TT |
1650 | item.changed = true; |
1651 | item.value_installed = true; | |
0604393c | 1652 | |
b926417a | 1653 | stack.push_back (std::move (item)); |
b6313243 | 1654 | } |
0604393c SM |
1655 | for (int i = unchanged.size () - 1; i >= 0; --i) |
1656 | { | |
1657 | if (!unchanged[i]->frozen) | |
1658 | { | |
b926417a | 1659 | varobj_update_result item (unchanged[i]); |
0604393c | 1660 | |
b926417a | 1661 | item.value_installed = true; |
0cc7d26f | 1662 | |
b926417a | 1663 | stack.push_back (std::move (item)); |
0604393c SM |
1664 | } |
1665 | } | |
1666 | if (r.changed || r.children_changed) | |
1667 | result.push_back (std::move (r)); | |
0cc7d26f | 1668 | |
b6313243 TT |
1669 | continue; |
1670 | } | |
1671 | } | |
28335dcc VP |
1672 | |
1673 | /* Push any children. Use reverse order so that the first | |
1674 | child is popped from the work stack first, and so | |
1675 | will be added to result first. This does not | |
1676 | affect correctness, just "nicer". */ | |
0604393c | 1677 | for (int i = v->children.size () - 1; i >= 0; --i) |
8b93c638 | 1678 | { |
ddf0ea08 | 1679 | varobj *c = v->children[i]; |
a109c7c1 | 1680 | |
28335dcc | 1681 | /* Child may be NULL if explicitly deleted by -var-delete. */ |
25d5ea92 | 1682 | if (c != NULL && !c->frozen) |
0604393c | 1683 | stack.emplace_back (c); |
8b93c638 | 1684 | } |
b6313243 TT |
1685 | |
1686 | if (r.changed || r.type_changed) | |
0604393c | 1687 | result.push_back (std::move (r)); |
8b93c638 JM |
1688 | } |
1689 | ||
f7f9ae2c | 1690 | return result; |
8b93c638 | 1691 | } |
8b93c638 JM |
1692 | |
1693 | /* Helper functions */ | |
1694 | ||
1695 | /* | |
1696 | * Variable object construction/destruction | |
1697 | */ | |
1698 | ||
1699 | static int | |
4c37490d | 1700 | delete_variable (struct varobj *var, bool only_children_p) |
8b93c638 JM |
1701 | { |
1702 | int delcount = 0; | |
1703 | ||
30914ca8 | 1704 | delete_variable_1 (&delcount, var, only_children_p, |
4c37490d | 1705 | true /* remove_from_parent_p */ ); |
8b93c638 JM |
1706 | |
1707 | return delcount; | |
1708 | } | |
1709 | ||
581e13c1 | 1710 | /* Delete the variable object VAR and its children. */ |
8b93c638 JM |
1711 | /* IMPORTANT NOTE: If we delete a variable which is a child |
1712 | and the parent is not removed we dump core. It must be always | |
581e13c1 | 1713 | initially called with remove_from_parent_p set. */ |
8b93c638 | 1714 | static void |
4c37490d SM |
1715 | delete_variable_1 (int *delcountp, struct varobj *var, bool only_children_p, |
1716 | bool remove_from_parent_p) | |
8b93c638 | 1717 | { |
581e13c1 | 1718 | /* Delete any children of this variable, too. */ |
ddf0ea08 | 1719 | for (varobj *child : var->children) |
28335dcc | 1720 | { |
214270ab VP |
1721 | if (!child) |
1722 | continue; | |
ddf0ea08 | 1723 | |
8b93c638 | 1724 | if (!remove_from_parent_p) |
28335dcc | 1725 | child->parent = NULL; |
ddf0ea08 | 1726 | |
4c37490d | 1727 | delete_variable_1 (delcountp, child, false, only_children_p); |
8b93c638 | 1728 | } |
ddf0ea08 | 1729 | var->children.clear (); |
8b93c638 | 1730 | |
581e13c1 | 1731 | /* if we were called to delete only the children we are done here. */ |
8b93c638 JM |
1732 | if (only_children_p) |
1733 | return; | |
1734 | ||
581e13c1 | 1735 | /* Otherwise, add it to the list of deleted ones and proceed to do so. */ |
2f408ecb | 1736 | /* If the name is empty, this is a temporary variable, that has not |
581e13c1 | 1737 | yet been installed, don't report it, it belongs to the caller... */ |
2f408ecb | 1738 | if (!var->obj_name.empty ()) |
8b93c638 | 1739 | { |
8b93c638 JM |
1740 | *delcountp = *delcountp + 1; |
1741 | } | |
1742 | ||
581e13c1 | 1743 | /* If this variable has a parent, remove it from its parent's list. */ |
8b93c638 JM |
1744 | /* OPTIMIZATION: if the parent of this variable is also being deleted, |
1745 | (as indicated by remove_from_parent_p) we don't bother doing an | |
1746 | expensive list search to find the element to remove when we are | |
581e13c1 | 1747 | discarding the list afterwards. */ |
72330bd6 | 1748 | if ((remove_from_parent_p) && (var->parent != NULL)) |
ddf0ea08 | 1749 | var->parent->children[var->index] = NULL; |
72330bd6 | 1750 | |
2f408ecb | 1751 | if (!var->obj_name.empty ()) |
73a93a32 | 1752 | uninstall_variable (var); |
8b93c638 | 1753 | |
581e13c1 | 1754 | /* Free memory associated with this variable. */ |
9e5b9d2b | 1755 | delete var; |
8b93c638 JM |
1756 | } |
1757 | ||
581e13c1 | 1758 | /* Install the given variable VAR with the object name VAR->OBJ_NAME. */ |
4c37490d | 1759 | static bool |
fba45db2 | 1760 | install_variable (struct varobj *var) |
8b93c638 | 1761 | { |
2c1413a9 TT |
1762 | hashval_t hash = htab_hash_string (var->obj_name.c_str ()); |
1763 | void **slot = htab_find_slot_with_hash (varobj_table, | |
1764 | var->obj_name.c_str (), | |
1765 | hash, INSERT); | |
1766 | if (*slot != nullptr) | |
8a3fe4f8 | 1767 | error (_("Duplicate variable object name")); |
8b93c638 | 1768 | |
581e13c1 | 1769 | /* Add varobj to hash table. */ |
2c1413a9 | 1770 | *slot = var; |
8b93c638 | 1771 | |
581e13c1 | 1772 | /* If root, add varobj to root list. */ |
b2c2bd75 | 1773 | if (is_root_p (var)) |
76deb5d9 | 1774 | rootlist.push_front (var->root); |
8b93c638 | 1775 | |
4c37490d | 1776 | return true; /* OK */ |
8b93c638 JM |
1777 | } |
1778 | ||
405feb71 | 1779 | /* Uninstall the object VAR. */ |
8b93c638 | 1780 | static void |
fba45db2 | 1781 | uninstall_variable (struct varobj *var) |
8b93c638 | 1782 | { |
2c1413a9 TT |
1783 | hashval_t hash = htab_hash_string (var->obj_name.c_str ()); |
1784 | htab_remove_elt_with_hash (varobj_table, var->obj_name.c_str (), hash); | |
8b93c638 JM |
1785 | |
1786 | if (varobjdebug) | |
2f408ecb | 1787 | fprintf_unfiltered (gdb_stdlog, "Deleting %s\n", var->obj_name.c_str ()); |
8b93c638 | 1788 | |
581e13c1 | 1789 | /* If root, remove varobj from root list. */ |
b2c2bd75 | 1790 | if (is_root_p (var)) |
8b93c638 | 1791 | { |
76deb5d9 TT |
1792 | auto iter = std::find (rootlist.begin (), rootlist.end (), var->root); |
1793 | rootlist.erase (iter); | |
8b93c638 | 1794 | } |
8b93c638 JM |
1795 | } |
1796 | ||
837ce252 SM |
1797 | /* Create and install a child of the parent of the given name. |
1798 | ||
1799 | The created VAROBJ takes ownership of the allocated NAME. */ | |
1800 | ||
8b93c638 | 1801 | static struct varobj * |
2f408ecb | 1802 | create_child (struct varobj *parent, int index, std::string &name) |
b6313243 | 1803 | { |
5a2e0d6e YQ |
1804 | struct varobj_item item; |
1805 | ||
2f408ecb | 1806 | std::swap (item.name, name); |
5a2e0d6e YQ |
1807 | item.value = value_of_child (parent, index); |
1808 | ||
1809 | return create_child_with_value (parent, index, &item); | |
b6313243 TT |
1810 | } |
1811 | ||
1812 | static struct varobj * | |
5a2e0d6e YQ |
1813 | create_child_with_value (struct varobj *parent, int index, |
1814 | struct varobj_item *item) | |
8b93c638 | 1815 | { |
9e5b9d2b | 1816 | varobj *child = new varobj (parent->root); |
8b93c638 | 1817 | |
5e5ac9a5 | 1818 | /* NAME is allocated by caller. */ |
2f408ecb | 1819 | std::swap (child->name, item->name); |
8b93c638 | 1820 | child->index = index; |
8b93c638 | 1821 | child->parent = parent; |
85254831 | 1822 | |
99ad9427 | 1823 | if (varobj_is_anonymous_child (child)) |
2f408ecb PA |
1824 | child->obj_name = string_printf ("%s.%d_anonymous", |
1825 | parent->obj_name.c_str (), index); | |
85254831 | 1826 | else |
2f408ecb PA |
1827 | child->obj_name = string_printf ("%s.%s", |
1828 | parent->obj_name.c_str (), | |
1829 | child->name.c_str ()); | |
85254831 | 1830 | |
8b93c638 JM |
1831 | install_variable (child); |
1832 | ||
acd65feb VP |
1833 | /* Compute the type of the child. Must do this before |
1834 | calling install_new_value. */ | |
5a2e0d6e | 1835 | if (item->value != NULL) |
acd65feb | 1836 | /* If the child had no evaluation errors, var->value |
581e13c1 | 1837 | will be non-NULL and contain a valid type. */ |
5a2e0d6e | 1838 | child->type = value_actual_type (item->value, 0, NULL); |
acd65feb | 1839 | else |
581e13c1 | 1840 | /* Otherwise, we must compute the type. */ |
ca20d462 YQ |
1841 | child->type = (*child->root->lang_ops->type_of_child) (child->parent, |
1842 | child->index); | |
5a2e0d6e | 1843 | install_new_value (child, item->value, 1); |
acd65feb | 1844 | |
8b93c638 JM |
1845 | return child; |
1846 | } | |
8b93c638 JM |
1847 | \f |
1848 | ||
1849 | /* | |
1850 | * Miscellaneous utility functions. | |
1851 | */ | |
1852 | ||
581e13c1 | 1853 | /* Allocate memory and initialize a new variable. */ |
9e5b9d2b SM |
1854 | varobj::varobj (varobj_root *root_) |
1855 | : root (root_), dynamic (new varobj_dynamic) | |
8b93c638 | 1856 | { |
8b93c638 JM |
1857 | } |
1858 | ||
581e13c1 | 1859 | /* Free any allocated memory associated with VAR. */ |
9e5b9d2b SM |
1860 | |
1861 | varobj::~varobj () | |
8b93c638 | 1862 | { |
9e5b9d2b SM |
1863 | varobj *var = this; |
1864 | ||
d452c4bc | 1865 | #if HAVE_PYTHON |
bb5ce47a | 1866 | if (var->dynamic->pretty_printer != NULL) |
d452c4bc | 1867 | { |
bde7b3e3 | 1868 | gdbpy_enter_varobj enter_py (var); |
bb5ce47a YQ |
1869 | |
1870 | Py_XDECREF (var->dynamic->constructor); | |
1871 | Py_XDECREF (var->dynamic->pretty_printer); | |
d452c4bc UW |
1872 | } |
1873 | #endif | |
1874 | ||
827f100c | 1875 | varobj_clear_saved_item (var->dynamic); |
36746093 | 1876 | |
b2c2bd75 | 1877 | if (is_root_p (var)) |
4d01a485 | 1878 | delete var->root; |
8b93c638 | 1879 | |
9e5b9d2b | 1880 | delete var->dynamic; |
74b7792f AC |
1881 | } |
1882 | ||
6e2a9270 VP |
1883 | /* Return the type of the value that's stored in VAR, |
1884 | or that would have being stored there if the | |
581e13c1 | 1885 | value were accessible. |
6e2a9270 VP |
1886 | |
1887 | This differs from VAR->type in that VAR->type is always | |
85102364 | 1888 | the true type of the expression in the source language. |
6e2a9270 VP |
1889 | The return value of this function is the type we're |
1890 | actually storing in varobj, and using for displaying | |
1891 | the values and for comparing previous and new values. | |
1892 | ||
1893 | For example, top-level references are always stripped. */ | |
99ad9427 | 1894 | struct type * |
b09e2c59 | 1895 | varobj_get_value_type (const struct varobj *var) |
6e2a9270 VP |
1896 | { |
1897 | struct type *type; | |
1898 | ||
b4d61099 TT |
1899 | if (var->value != nullptr) |
1900 | type = value_type (var->value.get ()); | |
6e2a9270 VP |
1901 | else |
1902 | type = var->type; | |
1903 | ||
1904 | type = check_typedef (type); | |
1905 | ||
aa006118 | 1906 | if (TYPE_IS_REFERENCE (type)) |
6e2a9270 VP |
1907 | type = get_target_type (type); |
1908 | ||
1909 | type = check_typedef (type); | |
1910 | ||
1911 | return type; | |
1912 | } | |
1913 | ||
8b93c638 | 1914 | /* What is the default display for this variable? We assume that |
581e13c1 | 1915 | everything is "natural". Any exceptions? */ |
8b93c638 | 1916 | static enum varobj_display_formats |
fba45db2 | 1917 | variable_default_display (struct varobj *var) |
8b93c638 JM |
1918 | { |
1919 | return FORMAT_NATURAL; | |
1920 | } | |
1921 | ||
8b93c638 JM |
1922 | /* |
1923 | * Language-dependencies | |
1924 | */ | |
1925 | ||
1926 | /* Common entry points */ | |
1927 | ||
8b93c638 JM |
1928 | /* Return the number of children for a given variable. |
1929 | The result of this function is defined by the language | |
581e13c1 | 1930 | implementation. The number of children returned by this function |
8b93c638 | 1931 | is the number of children that the user will see in the variable |
581e13c1 | 1932 | display. */ |
8b93c638 | 1933 | static int |
b09e2c59 | 1934 | number_of_children (const struct varobj *var) |
8b93c638 | 1935 | { |
ca20d462 | 1936 | return (*var->root->lang_ops->number_of_children) (var); |
8b93c638 JM |
1937 | } |
1938 | ||
2f408ecb PA |
1939 | /* What is the expression for the root varobj VAR? */ |
1940 | ||
1941 | static std::string | |
b09e2c59 | 1942 | name_of_variable (const struct varobj *var) |
8b93c638 | 1943 | { |
ca20d462 | 1944 | return (*var->root->lang_ops->name_of_variable) (var); |
8b93c638 JM |
1945 | } |
1946 | ||
2f408ecb PA |
1947 | /* What is the name of the INDEX'th child of VAR? */ |
1948 | ||
1949 | static std::string | |
fba45db2 | 1950 | name_of_child (struct varobj *var, int index) |
8b93c638 | 1951 | { |
ca20d462 | 1952 | return (*var->root->lang_ops->name_of_child) (var, index); |
8b93c638 JM |
1953 | } |
1954 | ||
2213e2be | 1955 | /* If frame associated with VAR can be found, switch |
4c37490d | 1956 | to it and return true. Otherwise, return false. */ |
2213e2be | 1957 | |
4c37490d | 1958 | static bool |
b09e2c59 | 1959 | check_scope (const struct varobj *var) |
2213e2be YQ |
1960 | { |
1961 | struct frame_info *fi; | |
4c37490d | 1962 | bool scope; |
2213e2be YQ |
1963 | |
1964 | fi = frame_find_by_id (var->root->frame); | |
1965 | scope = fi != NULL; | |
1966 | ||
1967 | if (fi) | |
1968 | { | |
1969 | CORE_ADDR pc = get_frame_pc (fi); | |
1970 | ||
1971 | if (pc < BLOCK_START (var->root->valid_block) || | |
1972 | pc >= BLOCK_END (var->root->valid_block)) | |
4c37490d | 1973 | scope = false; |
2213e2be YQ |
1974 | else |
1975 | select_frame (fi); | |
1976 | } | |
1977 | return scope; | |
1978 | } | |
1979 | ||
1980 | /* Helper function to value_of_root. */ | |
1981 | ||
1982 | static struct value * | |
1983 | value_of_root_1 (struct varobj **var_handle) | |
1984 | { | |
1985 | struct value *new_val = NULL; | |
1986 | struct varobj *var = *var_handle; | |
4c37490d | 1987 | bool within_scope = false; |
2213e2be YQ |
1988 | |
1989 | /* Only root variables can be updated... */ | |
1990 | if (!is_root_p (var)) | |
1991 | /* Not a root var. */ | |
1992 | return NULL; | |
1993 | ||
5ed8105e | 1994 | scoped_restore_current_thread restore_thread; |
2213e2be YQ |
1995 | |
1996 | /* Determine whether the variable is still around. */ | |
1997 | if (var->root->valid_block == NULL || var->root->floating) | |
4c37490d | 1998 | within_scope = true; |
2213e2be YQ |
1999 | else if (var->root->thread_id == 0) |
2000 | { | |
2001 | /* The program was single-threaded when the variable object was | |
2002 | created. Technically, it's possible that the program became | |
2003 | multi-threaded since then, but we don't support such | |
2004 | scenario yet. */ | |
2005 | within_scope = check_scope (var); | |
2006 | } | |
2007 | else | |
2008 | { | |
00431a78 | 2009 | thread_info *thread = find_thread_global_id (var->root->thread_id); |
5d5658a1 | 2010 | |
00431a78 | 2011 | if (thread != NULL) |
2213e2be | 2012 | { |
00431a78 | 2013 | switch_to_thread (thread); |
2213e2be YQ |
2014 | within_scope = check_scope (var); |
2015 | } | |
2016 | } | |
2017 | ||
2018 | if (within_scope) | |
2019 | { | |
2213e2be YQ |
2020 | |
2021 | /* We need to catch errors here, because if evaluate | |
dda83cd7 | 2022 | expression fails we want to just return NULL. */ |
a70b8144 | 2023 | try |
2213e2be | 2024 | { |
4d01a485 | 2025 | new_val = evaluate_expression (var->root->exp.get ()); |
2213e2be | 2026 | } |
230d2906 | 2027 | catch (const gdb_exception_error &except) |
492d29ea PA |
2028 | { |
2029 | } | |
2213e2be YQ |
2030 | } |
2031 | ||
2213e2be YQ |
2032 | return new_val; |
2033 | } | |
2034 | ||
a5defcdc VP |
2035 | /* What is the ``struct value *'' of the root variable VAR? |
2036 | For floating variable object, evaluation can get us a value | |
2037 | of different type from what is stored in varobj already. In | |
2038 | that case: | |
2039 | - *type_changed will be set to 1 | |
2040 | - old varobj will be freed, and new one will be | |
2041 | created, with the same name. | |
2042 | - *var_handle will be set to the new varobj | |
2043 | Otherwise, *type_changed will be set to 0. */ | |
30b28db1 | 2044 | static struct value * |
4c37490d | 2045 | value_of_root (struct varobj **var_handle, bool *type_changed) |
8b93c638 | 2046 | { |
73a93a32 JI |
2047 | struct varobj *var; |
2048 | ||
2049 | if (var_handle == NULL) | |
2050 | return NULL; | |
2051 | ||
2052 | var = *var_handle; | |
2053 | ||
2054 | /* This should really be an exception, since this should | |
581e13c1 | 2055 | only get called with a root variable. */ |
73a93a32 | 2056 | |
b2c2bd75 | 2057 | if (!is_root_p (var)) |
73a93a32 JI |
2058 | return NULL; |
2059 | ||
a5defcdc | 2060 | if (var->root->floating) |
73a93a32 JI |
2061 | { |
2062 | struct varobj *tmp_var; | |
6225abfa | 2063 | |
2f408ecb | 2064 | tmp_var = varobj_create (NULL, var->name.c_str (), (CORE_ADDR) 0, |
73a93a32 JI |
2065 | USE_SELECTED_FRAME); |
2066 | if (tmp_var == NULL) | |
2067 | { | |
2068 | return NULL; | |
2069 | } | |
2f408ecb PA |
2070 | std::string old_type = varobj_get_type (var); |
2071 | std::string new_type = varobj_get_type (tmp_var); | |
2072 | if (old_type == new_type) | |
73a93a32 | 2073 | { |
fcacd99f VP |
2074 | /* The expression presently stored inside var->root->exp |
2075 | remembers the locations of local variables relatively to | |
2076 | the frame where the expression was created (in DWARF location | |
2077 | button, for example). Naturally, those locations are not | |
2078 | correct in other frames, so update the expression. */ | |
2079 | ||
4d01a485 | 2080 | std::swap (var->root->exp, tmp_var->root->exp); |
fcacd99f | 2081 | |
30914ca8 | 2082 | varobj_delete (tmp_var, 0); |
73a93a32 JI |
2083 | *type_changed = 0; |
2084 | } | |
2085 | else | |
2086 | { | |
2f408ecb | 2087 | tmp_var->obj_name = var->obj_name; |
0cc7d26f TT |
2088 | tmp_var->from = var->from; |
2089 | tmp_var->to = var->to; | |
30914ca8 | 2090 | varobj_delete (var, 0); |
a5defcdc | 2091 | |
73a93a32 JI |
2092 | install_variable (tmp_var); |
2093 | *var_handle = tmp_var; | |
705da579 | 2094 | var = *var_handle; |
4c37490d | 2095 | *type_changed = true; |
73a93a32 JI |
2096 | } |
2097 | } | |
2098 | else | |
2099 | { | |
2100 | *type_changed = 0; | |
2101 | } | |
2102 | ||
7a290c40 JB |
2103 | { |
2104 | struct value *value; | |
2105 | ||
2213e2be | 2106 | value = value_of_root_1 (var_handle); |
7a290c40 JB |
2107 | if (var->value == NULL || value == NULL) |
2108 | { | |
2109 | /* For root varobj-s, a NULL value indicates a scoping issue. | |
2110 | So, nothing to do in terms of checking for mutations. */ | |
2111 | } | |
2112 | else if (varobj_value_has_mutated (var, value, value_type (value))) | |
2113 | { | |
2114 | /* The type has mutated, so the children are no longer valid. | |
2115 | Just delete them, and tell our caller that the type has | |
2116 | changed. */ | |
30914ca8 | 2117 | varobj_delete (var, 1 /* only_children */); |
7a290c40 JB |
2118 | var->num_children = -1; |
2119 | var->to = -1; | |
2120 | var->from = -1; | |
4c37490d | 2121 | *type_changed = true; |
7a290c40 JB |
2122 | } |
2123 | return value; | |
2124 | } | |
8b93c638 JM |
2125 | } |
2126 | ||
581e13c1 | 2127 | /* What is the ``struct value *'' for the INDEX'th child of PARENT? */ |
30b28db1 | 2128 | static struct value * |
c1cc6152 | 2129 | value_of_child (const struct varobj *parent, int index) |
8b93c638 | 2130 | { |
30b28db1 | 2131 | struct value *value; |
8b93c638 | 2132 | |
ca20d462 | 2133 | value = (*parent->root->lang_ops->value_of_child) (parent, index); |
8b93c638 | 2134 | |
8b93c638 JM |
2135 | return value; |
2136 | } | |
2137 | ||
581e13c1 | 2138 | /* GDB already has a command called "value_of_variable". Sigh. */ |
2f408ecb | 2139 | static std::string |
de051565 | 2140 | my_value_of_variable (struct varobj *var, enum varobj_display_formats format) |
8b93c638 | 2141 | { |
8756216b | 2142 | if (var->root->is_valid) |
0cc7d26f | 2143 | { |
bb5ce47a | 2144 | if (var->dynamic->pretty_printer != NULL) |
b4d61099 TT |
2145 | return varobj_value_get_print_value (var->value.get (), var->format, |
2146 | var); | |
ca20d462 | 2147 | return (*var->root->lang_ops->value_of_variable) (var, format); |
0cc7d26f | 2148 | } |
8756216b | 2149 | else |
2f408ecb | 2150 | return std::string (); |
8b93c638 JM |
2151 | } |
2152 | ||
99ad9427 YQ |
2153 | void |
2154 | varobj_formatted_print_options (struct value_print_options *opts, | |
2155 | enum varobj_display_formats format) | |
2156 | { | |
2157 | get_formatted_print_options (opts, format_code[(int) format]); | |
2158 | opts->deref_ref = 0; | |
0625771b | 2159 | opts->raw = !pretty_printing; |
99ad9427 YQ |
2160 | } |
2161 | ||
2f408ecb | 2162 | std::string |
99ad9427 YQ |
2163 | varobj_value_get_print_value (struct value *value, |
2164 | enum varobj_display_formats format, | |
b09e2c59 | 2165 | const struct varobj *var) |
85265413 | 2166 | { |
79a45b7d | 2167 | struct value_print_options opts; |
be759fcf PM |
2168 | struct type *type = NULL; |
2169 | long len = 0; | |
1eba6383 | 2170 | gdb::unique_xmalloc_ptr<char> encoding; |
3a182a69 JK |
2171 | /* Initialize it just to avoid a GCC false warning. */ |
2172 | CORE_ADDR str_addr = 0; | |
4c37490d | 2173 | bool string_print = false; |
57e66780 DJ |
2174 | |
2175 | if (value == NULL) | |
2f408ecb | 2176 | return std::string (); |
57e66780 | 2177 | |
d7e74731 | 2178 | string_file stb; |
2f408ecb PA |
2179 | std::string thevalue; |
2180 | ||
b6313243 | 2181 | #if HAVE_PYTHON |
0646da15 TT |
2182 | if (gdb_python_initialized) |
2183 | { | |
bb5ce47a | 2184 | PyObject *value_formatter = var->dynamic->pretty_printer; |
d452c4bc | 2185 | |
68cdc557 | 2186 | gdbpy_enter_varobj enter_py (var); |
09ca9e2e | 2187 | |
0646da15 TT |
2188 | if (value_formatter) |
2189 | { | |
2190 | /* First check to see if we have any children at all. If so, | |
2191 | we simply return {...}. */ | |
2192 | if (dynamic_varobj_has_child_method (var)) | |
d7e74731 | 2193 | return "{...}"; |
b6313243 | 2194 | |
0646da15 TT |
2195 | if (PyObject_HasAttr (value_formatter, gdbpy_to_string_cst)) |
2196 | { | |
2197 | struct value *replacement; | |
0646da15 | 2198 | |
a5c5eda7 SM |
2199 | gdbpy_ref<> output = apply_varobj_pretty_printer (value_formatter, |
2200 | &replacement, | |
2201 | &stb); | |
0646da15 TT |
2202 | |
2203 | /* If we have string like output ... */ | |
68cdc557 | 2204 | if (output != NULL) |
0646da15 | 2205 | { |
0646da15 TT |
2206 | /* If this is a lazy string, extract it. For lazy |
2207 | strings we always print as a string, so set | |
2208 | string_print. */ | |
68cdc557 | 2209 | if (gdbpy_is_lazy_string (output.get ())) |
0646da15 | 2210 | { |
68cdc557 TT |
2211 | gdbpy_extract_lazy_string (output.get (), &str_addr, |
2212 | &type, &len, &encoding); | |
4c37490d | 2213 | string_print = true; |
0646da15 TT |
2214 | } |
2215 | else | |
2216 | { | |
2217 | /* If it is a regular (non-lazy) string, extract | |
2218 | it and copy the contents into THEVALUE. If the | |
2219 | hint says to print it as a string, set | |
2220 | string_print. Otherwise just return the extracted | |
2221 | string as a value. */ | |
2222 | ||
9b972014 | 2223 | gdb::unique_xmalloc_ptr<char> s |
68cdc557 | 2224 | = python_string_to_target_string (output.get ()); |
0646da15 TT |
2225 | |
2226 | if (s) | |
2227 | { | |
e3821cca | 2228 | struct gdbarch *gdbarch; |
0646da15 | 2229 | |
9b972014 TT |
2230 | gdb::unique_xmalloc_ptr<char> hint |
2231 | = gdbpy_get_display_hint (value_formatter); | |
0646da15 TT |
2232 | if (hint) |
2233 | { | |
9b972014 | 2234 | if (!strcmp (hint.get (), "string")) |
4c37490d | 2235 | string_print = true; |
0646da15 TT |
2236 | } |
2237 | ||
9b972014 | 2238 | thevalue = std::string (s.get ()); |
2f408ecb | 2239 | len = thevalue.size (); |
e3821cca | 2240 | gdbarch = get_type_arch (value_type (value)); |
0646da15 | 2241 | type = builtin_type (gdbarch)->builtin_char; |
0646da15 TT |
2242 | |
2243 | if (!string_print) | |
d7e74731 | 2244 | return thevalue; |
0646da15 TT |
2245 | } |
2246 | else | |
2247 | gdbpy_print_stack (); | |
2248 | } | |
2249 | } | |
2250 | /* If the printer returned a replacement value, set VALUE | |
2251 | to REPLACEMENT. If there is not a replacement value, | |
2252 | just use the value passed to this function. */ | |
2253 | if (replacement) | |
2254 | value = replacement; | |
2255 | } | |
2256 | } | |
2257 | } | |
b6313243 TT |
2258 | #endif |
2259 | ||
99ad9427 | 2260 | varobj_formatted_print_options (&opts, format); |
00bd41d6 PM |
2261 | |
2262 | /* If the THEVALUE has contents, it is a regular string. */ | |
2f408ecb | 2263 | if (!thevalue.empty ()) |
d7e74731 | 2264 | LA_PRINT_STRING (&stb, type, (gdb_byte *) thevalue.c_str (), |
1eba6383 | 2265 | len, encoding.get (), 0, &opts); |
09ca9e2e | 2266 | else if (string_print) |
00bd41d6 PM |
2267 | /* Otherwise, if string_print is set, and it is not a regular |
2268 | string, it is a lazy string. */ | |
d7e74731 | 2269 | val_print_string (type, encoding.get (), str_addr, len, &stb, &opts); |
b6313243 | 2270 | else |
00bd41d6 | 2271 | /* All other cases. */ |
d7e74731 | 2272 | common_val_print (value, &stb, 0, &opts, current_language); |
57e66780 | 2273 | |
d7e74731 | 2274 | return std::move (stb.string ()); |
85265413 NR |
2275 | } |
2276 | ||
4c37490d | 2277 | bool |
b09e2c59 | 2278 | varobj_editable_p (const struct varobj *var) |
340a7723 NR |
2279 | { |
2280 | struct type *type; | |
340a7723 | 2281 | |
b4d61099 TT |
2282 | if (!(var->root->is_valid && var->value != nullptr |
2283 | && VALUE_LVAL (var->value.get ()))) | |
4c37490d | 2284 | return false; |
340a7723 | 2285 | |
99ad9427 | 2286 | type = varobj_get_value_type (var); |
340a7723 | 2287 | |
78134374 | 2288 | switch (type->code ()) |
340a7723 NR |
2289 | { |
2290 | case TYPE_CODE_STRUCT: | |
2291 | case TYPE_CODE_UNION: | |
2292 | case TYPE_CODE_ARRAY: | |
2293 | case TYPE_CODE_FUNC: | |
2294 | case TYPE_CODE_METHOD: | |
4c37490d | 2295 | return false; |
340a7723 NR |
2296 | break; |
2297 | ||
2298 | default: | |
4c37490d | 2299 | return true; |
340a7723 NR |
2300 | break; |
2301 | } | |
2302 | } | |
2303 | ||
d32cafc7 | 2304 | /* Call VAR's value_is_changeable_p language-specific callback. */ |
acd65feb | 2305 | |
4c37490d | 2306 | bool |
b09e2c59 | 2307 | varobj_value_is_changeable_p (const struct varobj *var) |
8b93c638 | 2308 | { |
ca20d462 | 2309 | return var->root->lang_ops->value_is_changeable_p (var); |
8b93c638 JM |
2310 | } |
2311 | ||
4c37490d | 2312 | /* Return true if that varobj is floating, that is is always evaluated in the |
5a413362 VP |
2313 | selected frame, and not bound to thread/frame. Such variable objects |
2314 | are created using '@' as frame specifier to -var-create. */ | |
4c37490d | 2315 | bool |
b09e2c59 | 2316 | varobj_floating_p (const struct varobj *var) |
5a413362 VP |
2317 | { |
2318 | return var->root->floating; | |
2319 | } | |
2320 | ||
d32cafc7 JB |
2321 | /* Implement the "value_is_changeable_p" varobj callback for most |
2322 | languages. */ | |
2323 | ||
4c37490d | 2324 | bool |
b09e2c59 | 2325 | varobj_default_value_is_changeable_p (const struct varobj *var) |
d32cafc7 | 2326 | { |
4c37490d | 2327 | bool r; |
d32cafc7 JB |
2328 | struct type *type; |
2329 | ||
2330 | if (CPLUS_FAKE_CHILD (var)) | |
4c37490d | 2331 | return false; |
d32cafc7 | 2332 | |
99ad9427 | 2333 | type = varobj_get_value_type (var); |
d32cafc7 | 2334 | |
78134374 | 2335 | switch (type->code ()) |
d32cafc7 JB |
2336 | { |
2337 | case TYPE_CODE_STRUCT: | |
2338 | case TYPE_CODE_UNION: | |
2339 | case TYPE_CODE_ARRAY: | |
4c37490d | 2340 | r = false; |
d32cafc7 JB |
2341 | break; |
2342 | ||
2343 | default: | |
4c37490d | 2344 | r = true; |
d32cafc7 JB |
2345 | } |
2346 | ||
2347 | return r; | |
2348 | } | |
2349 | ||
d8f168dd TT |
2350 | /* Iterate all the existing _root_ VAROBJs and call the FUNC callback |
2351 | for each one. */ | |
54333c3b JK |
2352 | |
2353 | void | |
d8f168dd | 2354 | all_root_varobjs (gdb::function_view<void (struct varobj *var)> func) |
54333c3b | 2355 | { |
54333c3b | 2356 | /* Iterate "safely" - handle if the callee deletes its passed VAROBJ. */ |
76deb5d9 TT |
2357 | auto iter = rootlist.begin (); |
2358 | auto end = rootlist.end (); | |
2359 | while (iter != end) | |
54333c3b | 2360 | { |
76deb5d9 | 2361 | auto self = iter++; |
d8f168dd | 2362 | func ((*self)->rootvar); |
54333c3b JK |
2363 | } |
2364 | } | |
8756216b | 2365 | |
54333c3b | 2366 | /* Invalidate varobj VAR if it is tied to locals and re-create it if it is |
4e969b4f AB |
2367 | defined on globals. It is a helper for varobj_invalidate. |
2368 | ||
2369 | This function is called after changing the symbol file, in this case the | |
2370 | pointers to "struct type" stored by the varobj are no longer valid. All | |
2371 | varobj must be either re-evaluated, or marked as invalid here. */ | |
2dbd25e5 | 2372 | |
54333c3b | 2373 | static void |
d8f168dd | 2374 | varobj_invalidate_iter (struct varobj *var) |
8756216b | 2375 | { |
4e969b4f AB |
2376 | /* global and floating var must be re-evaluated. */ |
2377 | if (var->root->floating || var->root->valid_block == NULL) | |
2dbd25e5 | 2378 | { |
54333c3b | 2379 | struct varobj *tmp_var; |
2dbd25e5 | 2380 | |
54333c3b JK |
2381 | /* Try to create a varobj with same expression. If we succeed |
2382 | replace the old varobj, otherwise invalidate it. */ | |
2f408ecb | 2383 | tmp_var = varobj_create (NULL, var->name.c_str (), (CORE_ADDR) 0, |
54333c3b JK |
2384 | USE_CURRENT_FRAME); |
2385 | if (tmp_var != NULL) | |
2386 | { | |
2f408ecb | 2387 | tmp_var->obj_name = var->obj_name; |
30914ca8 | 2388 | varobj_delete (var, 0); |
54333c3b | 2389 | install_variable (tmp_var); |
2dbd25e5 | 2390 | } |
54333c3b | 2391 | else |
4c37490d | 2392 | var->root->is_valid = false; |
2dbd25e5 | 2393 | } |
54333c3b | 2394 | else /* locals must be invalidated. */ |
4c37490d | 2395 | var->root->is_valid = false; |
54333c3b JK |
2396 | } |
2397 | ||
2398 | /* Invalidate the varobjs that are tied to locals and re-create the ones that | |
2399 | are defined on globals. | |
2400 | Invalidated varobjs will be always printed in_scope="invalid". */ | |
2401 | ||
2402 | void | |
2403 | varobj_invalidate (void) | |
2404 | { | |
d8f168dd | 2405 | all_root_varobjs (varobj_invalidate_iter); |
8756216b | 2406 | } |
481695ed | 2407 | |
2c1413a9 TT |
2408 | /* A hash function for a varobj. */ |
2409 | ||
2410 | static hashval_t | |
2411 | hash_varobj (const void *a) | |
2412 | { | |
2413 | const varobj *obj = (const varobj *) a; | |
2414 | return htab_hash_string (obj->obj_name.c_str ()); | |
2415 | } | |
2416 | ||
2417 | /* A hash table equality function for varobjs. */ | |
2418 | ||
2419 | static int | |
2420 | eq_varobj_and_string (const void *a, const void *b) | |
2421 | { | |
2422 | const varobj *obj = (const varobj *) a; | |
2423 | const char *name = (const char *) b; | |
2424 | ||
2425 | return obj->obj_name == name; | |
2426 | } | |
2427 | ||
6c265988 | 2428 | void _initialize_varobj (); |
1c3569d4 | 2429 | void |
6c265988 | 2430 | _initialize_varobj () |
1c3569d4 | 2431 | { |
2c1413a9 TT |
2432 | varobj_table = htab_create_alloc (5, hash_varobj, eq_varobj_and_string, |
2433 | nullptr, xcalloc, xfree); | |
1c3569d4 MR |
2434 | |
2435 | add_setshow_zuinteger_cmd ("varobj", class_maintenance, | |
2436 | &varobjdebug, | |
2437 | _("Set varobj debugging."), | |
2438 | _("Show varobj debugging."), | |
2439 | _("When non-zero, varobj debugging is enabled."), | |
2440 | NULL, show_varobjdebug, | |
2441 | &setdebuglist, &showdebuglist); | |
2442 | } |