| 1 | /* Implementation of the GDB variable objects API. |
| 2 | |
| 3 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include "defs.h" |
| 19 | #include "value.h" |
| 20 | #include "expression.h" |
| 21 | #include "frame.h" |
| 22 | #include "language.h" |
| 23 | #include "gdbcmd.h" |
| 24 | #include "block.h" |
| 25 | #include "valprint.h" |
| 26 | #include "gdb_regex.h" |
| 27 | |
| 28 | #include "varobj.h" |
| 29 | #include "common/vec.h" |
| 30 | #include "gdbthread.h" |
| 31 | #include "inferior.h" |
| 32 | #include "varobj-iter.h" |
| 33 | #include "parser-defs.h" |
| 34 | |
| 35 | #if HAVE_PYTHON |
| 36 | #include "python/python.h" |
| 37 | #include "python/python-internal.h" |
| 38 | #else |
| 39 | typedef int PyObject; |
| 40 | #endif |
| 41 | |
| 42 | /* Non-zero if we want to see trace of varobj level stuff. */ |
| 43 | |
| 44 | unsigned int varobjdebug = 0; |
| 45 | static void |
| 46 | show_varobjdebug (struct ui_file *file, int from_tty, |
| 47 | struct cmd_list_element *c, const char *value) |
| 48 | { |
| 49 | fprintf_filtered (file, _("Varobj debugging is %s.\n"), value); |
| 50 | } |
| 51 | |
| 52 | /* String representations of gdb's format codes. */ |
| 53 | const char *varobj_format_string[] = |
| 54 | { "natural", "binary", "decimal", "hexadecimal", "octal", "zero-hexadecimal" }; |
| 55 | |
| 56 | /* True if we want to allow Python-based pretty-printing. */ |
| 57 | static bool pretty_printing = false; |
| 58 | |
| 59 | void |
| 60 | varobj_enable_pretty_printing (void) |
| 61 | { |
| 62 | pretty_printing = true; |
| 63 | } |
| 64 | |
| 65 | /* Data structures */ |
| 66 | |
| 67 | /* Every root variable has one of these structures saved in its |
| 68 | varobj. */ |
| 69 | struct varobj_root |
| 70 | { |
| 71 | /* The expression for this parent. */ |
| 72 | expression_up exp; |
| 73 | |
| 74 | /* Block for which this expression is valid. */ |
| 75 | const struct block *valid_block = NULL; |
| 76 | |
| 77 | /* The frame for this expression. This field is set iff valid_block is |
| 78 | not NULL. */ |
| 79 | struct frame_id frame = null_frame_id; |
| 80 | |
| 81 | /* The global thread ID that this varobj_root belongs to. This field |
| 82 | is only valid if valid_block is not NULL. |
| 83 | When not 0, indicates which thread 'frame' belongs to. |
| 84 | When 0, indicates that the thread list was empty when the varobj_root |
| 85 | was created. */ |
| 86 | int thread_id = 0; |
| 87 | |
| 88 | /* If true, the -var-update always recomputes the value in the |
| 89 | current thread and frame. Otherwise, variable object is |
| 90 | always updated in the specific scope/thread/frame. */ |
| 91 | bool floating = false; |
| 92 | |
| 93 | /* Flag that indicates validity: set to false when this varobj_root refers |
| 94 | to symbols that do not exist anymore. */ |
| 95 | bool is_valid = true; |
| 96 | |
| 97 | /* Language-related operations for this variable and its |
| 98 | children. */ |
| 99 | const struct lang_varobj_ops *lang_ops = NULL; |
| 100 | |
| 101 | /* The varobj for this root node. */ |
| 102 | struct varobj *rootvar = NULL; |
| 103 | |
| 104 | /* Next root variable */ |
| 105 | struct varobj_root *next = NULL; |
| 106 | }; |
| 107 | |
| 108 | /* Dynamic part of varobj. */ |
| 109 | |
| 110 | struct varobj_dynamic |
| 111 | { |
| 112 | /* Whether the children of this varobj were requested. This field is |
| 113 | used to decide if dynamic varobj should recompute their children. |
| 114 | In the event that the frontend never asked for the children, we |
| 115 | can avoid that. */ |
| 116 | bool children_requested = false; |
| 117 | |
| 118 | /* The pretty-printer constructor. If NULL, then the default |
| 119 | pretty-printer will be looked up. If None, then no |
| 120 | pretty-printer will be installed. */ |
| 121 | PyObject *constructor = NULL; |
| 122 | |
| 123 | /* The pretty-printer that has been constructed. If NULL, then a |
| 124 | new printer object is needed, and one will be constructed. */ |
| 125 | PyObject *pretty_printer = NULL; |
| 126 | |
| 127 | /* The iterator returned by the printer's 'children' method, or NULL |
| 128 | if not available. */ |
| 129 | struct varobj_iter *child_iter = NULL; |
| 130 | |
| 131 | /* We request one extra item from the iterator, so that we can |
| 132 | report to the caller whether there are more items than we have |
| 133 | already reported. However, we don't want to install this value |
| 134 | when we read it, because that will mess up future updates. So, |
| 135 | we stash it here instead. */ |
| 136 | varobj_item *saved_item = NULL; |
| 137 | }; |
| 138 | |
| 139 | /* A list of varobjs */ |
| 140 | |
| 141 | struct vlist |
| 142 | { |
| 143 | struct varobj *var; |
| 144 | struct vlist *next; |
| 145 | }; |
| 146 | |
| 147 | /* Private function prototypes */ |
| 148 | |
| 149 | /* Helper functions for the above subcommands. */ |
| 150 | |
| 151 | static int delete_variable (struct varobj *, bool); |
| 152 | |
| 153 | static void delete_variable_1 (int *, struct varobj *, bool, bool); |
| 154 | |
| 155 | static bool install_variable (struct varobj *); |
| 156 | |
| 157 | static void uninstall_variable (struct varobj *); |
| 158 | |
| 159 | static struct varobj *create_child (struct varobj *, int, std::string &); |
| 160 | |
| 161 | static struct varobj * |
| 162 | create_child_with_value (struct varobj *parent, int index, |
| 163 | struct varobj_item *item); |
| 164 | |
| 165 | /* Utility routines */ |
| 166 | |
| 167 | static enum varobj_display_formats variable_default_display (struct varobj *); |
| 168 | |
| 169 | static bool update_type_if_necessary (struct varobj *var, |
| 170 | struct value *new_value); |
| 171 | |
| 172 | static bool install_new_value (struct varobj *var, struct value *value, |
| 173 | bool initial); |
| 174 | |
| 175 | /* Language-specific routines. */ |
| 176 | |
| 177 | static int number_of_children (const struct varobj *); |
| 178 | |
| 179 | static std::string name_of_variable (const struct varobj *); |
| 180 | |
| 181 | static std::string name_of_child (struct varobj *, int); |
| 182 | |
| 183 | static struct value *value_of_root (struct varobj **var_handle, bool *); |
| 184 | |
| 185 | static struct value *value_of_child (const struct varobj *parent, int index); |
| 186 | |
| 187 | static std::string my_value_of_variable (struct varobj *var, |
| 188 | enum varobj_display_formats format); |
| 189 | |
| 190 | static bool is_root_p (const struct varobj *var); |
| 191 | |
| 192 | static struct varobj *varobj_add_child (struct varobj *var, |
| 193 | struct varobj_item *item); |
| 194 | |
| 195 | /* Private data */ |
| 196 | |
| 197 | /* Mappings of varobj_display_formats enums to gdb's format codes. */ |
| 198 | static int format_code[] = { 0, 't', 'd', 'x', 'o', 'z' }; |
| 199 | |
| 200 | /* Header of the list of root variable objects. */ |
| 201 | static struct varobj_root *rootlist; |
| 202 | |
| 203 | /* Prime number indicating the number of buckets in the hash table. */ |
| 204 | /* A prime large enough to avoid too many collisions. */ |
| 205 | #define VAROBJ_TABLE_SIZE 227 |
| 206 | |
| 207 | /* Pointer to the varobj hash table (built at run time). */ |
| 208 | static struct vlist **varobj_table; |
| 209 | |
| 210 | \f |
| 211 | |
| 212 | /* API Implementation */ |
| 213 | static bool |
| 214 | is_root_p (const struct varobj *var) |
| 215 | { |
| 216 | return (var->root->rootvar == var); |
| 217 | } |
| 218 | |
| 219 | #ifdef HAVE_PYTHON |
| 220 | |
| 221 | /* See python-internal.h. */ |
| 222 | gdbpy_enter_varobj::gdbpy_enter_varobj (const struct varobj *var) |
| 223 | : gdbpy_enter (var->root->exp->gdbarch, var->root->exp->language_defn) |
| 224 | { |
| 225 | } |
| 226 | |
| 227 | #endif |
| 228 | |
| 229 | /* Return the full FRAME which corresponds to the given CORE_ADDR |
| 230 | or NULL if no FRAME on the chain corresponds to CORE_ADDR. */ |
| 231 | |
| 232 | static struct frame_info * |
| 233 | find_frame_addr_in_frame_chain (CORE_ADDR frame_addr) |
| 234 | { |
| 235 | struct frame_info *frame = NULL; |
| 236 | |
| 237 | if (frame_addr == (CORE_ADDR) 0) |
| 238 | return NULL; |
| 239 | |
| 240 | for (frame = get_current_frame (); |
| 241 | frame != NULL; |
| 242 | frame = get_prev_frame (frame)) |
| 243 | { |
| 244 | /* The CORE_ADDR we get as argument was parsed from a string GDB |
| 245 | output as $fp. This output got truncated to gdbarch_addr_bit. |
| 246 | Truncate the frame base address in the same manner before |
| 247 | comparing it against our argument. */ |
| 248 | CORE_ADDR frame_base = get_frame_base_address (frame); |
| 249 | int addr_bit = gdbarch_addr_bit (get_frame_arch (frame)); |
| 250 | |
| 251 | if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)) |
| 252 | frame_base &= ((CORE_ADDR) 1 << addr_bit) - 1; |
| 253 | |
| 254 | if (frame_base == frame_addr) |
| 255 | return frame; |
| 256 | } |
| 257 | |
| 258 | return NULL; |
| 259 | } |
| 260 | |
| 261 | /* Creates a varobj (not its children). */ |
| 262 | |
| 263 | struct varobj * |
| 264 | varobj_create (const char *objname, |
| 265 | const char *expression, CORE_ADDR frame, enum varobj_type type) |
| 266 | { |
| 267 | /* Fill out a varobj structure for the (root) variable being constructed. */ |
| 268 | std::unique_ptr<varobj> var (new varobj (new varobj_root)); |
| 269 | |
| 270 | if (expression != NULL) |
| 271 | { |
| 272 | struct frame_info *fi; |
| 273 | struct frame_id old_id = null_frame_id; |
| 274 | const struct block *block; |
| 275 | const char *p; |
| 276 | struct value *value = NULL; |
| 277 | CORE_ADDR pc; |
| 278 | |
| 279 | /* Parse and evaluate the expression, filling in as much of the |
| 280 | variable's data as possible. */ |
| 281 | |
| 282 | if (has_stack_frames ()) |
| 283 | { |
| 284 | /* Allow creator to specify context of variable. */ |
| 285 | if ((type == USE_CURRENT_FRAME) || (type == USE_SELECTED_FRAME)) |
| 286 | fi = get_selected_frame (NULL); |
| 287 | else |
| 288 | /* FIXME: cagney/2002-11-23: This code should be doing a |
| 289 | lookup using the frame ID and not just the frame's |
| 290 | ``address''. This, of course, means an interface |
| 291 | change. However, with out that interface change ISAs, |
| 292 | such as the ia64 with its two stacks, won't work. |
| 293 | Similar goes for the case where there is a frameless |
| 294 | function. */ |
| 295 | fi = find_frame_addr_in_frame_chain (frame); |
| 296 | } |
| 297 | else |
| 298 | fi = NULL; |
| 299 | |
| 300 | if (type == USE_SELECTED_FRAME) |
| 301 | var->root->floating = true; |
| 302 | |
| 303 | pc = 0; |
| 304 | block = NULL; |
| 305 | if (fi != NULL) |
| 306 | { |
| 307 | block = get_frame_block (fi, 0); |
| 308 | pc = get_frame_pc (fi); |
| 309 | } |
| 310 | |
| 311 | p = expression; |
| 312 | |
| 313 | innermost_block_tracker tracker (INNERMOST_BLOCK_FOR_SYMBOLS |
| 314 | | INNERMOST_BLOCK_FOR_REGISTERS); |
| 315 | /* Wrap the call to parse expression, so we can |
| 316 | return a sensible error. */ |
| 317 | try |
| 318 | { |
| 319 | var->root->exp = parse_exp_1 (&p, pc, block, 0, &tracker); |
| 320 | } |
| 321 | |
| 322 | catch (const gdb_exception_error &except) |
| 323 | { |
| 324 | return NULL; |
| 325 | } |
| 326 | |
| 327 | /* Don't allow variables to be created for types. */ |
| 328 | if (var->root->exp->elts[0].opcode == OP_TYPE |
| 329 | || var->root->exp->elts[0].opcode == OP_TYPEOF |
| 330 | || var->root->exp->elts[0].opcode == OP_DECLTYPE) |
| 331 | { |
| 332 | fprintf_unfiltered (gdb_stderr, "Attempt to use a type name" |
| 333 | " as an expression.\n"); |
| 334 | return NULL; |
| 335 | } |
| 336 | |
| 337 | var->format = variable_default_display (var.get ()); |
| 338 | var->root->valid_block = |
| 339 | var->root->floating ? NULL : tracker.block (); |
| 340 | var->name = expression; |
| 341 | /* For a root var, the name and the expr are the same. */ |
| 342 | var->path_expr = expression; |
| 343 | |
| 344 | /* When the frame is different from the current frame, |
| 345 | we must select the appropriate frame before parsing |
| 346 | the expression, otherwise the value will not be current. |
| 347 | Since select_frame is so benign, just call it for all cases. */ |
| 348 | if (var->root->valid_block) |
| 349 | { |
| 350 | /* User could specify explicit FRAME-ADDR which was not found but |
| 351 | EXPRESSION is frame specific and we would not be able to evaluate |
| 352 | it correctly next time. With VALID_BLOCK set we must also set |
| 353 | FRAME and THREAD_ID. */ |
| 354 | if (fi == NULL) |
| 355 | error (_("Failed to find the specified frame")); |
| 356 | |
| 357 | var->root->frame = get_frame_id (fi); |
| 358 | var->root->thread_id = inferior_thread ()->global_num; |
| 359 | old_id = get_frame_id (get_selected_frame (NULL)); |
| 360 | select_frame (fi); |
| 361 | } |
| 362 | |
| 363 | /* We definitely need to catch errors here. |
| 364 | If evaluate_expression succeeds we got the value we wanted. |
| 365 | But if it fails, we still go on with a call to evaluate_type(). */ |
| 366 | try |
| 367 | { |
| 368 | value = evaluate_expression (var->root->exp.get ()); |
| 369 | } |
| 370 | catch (const gdb_exception_error &except) |
| 371 | { |
| 372 | /* Error getting the value. Try to at least get the |
| 373 | right type. */ |
| 374 | struct value *type_only_value = evaluate_type (var->root->exp.get ()); |
| 375 | |
| 376 | var->type = value_type (type_only_value); |
| 377 | } |
| 378 | |
| 379 | if (value != NULL) |
| 380 | { |
| 381 | int real_type_found = 0; |
| 382 | |
| 383 | var->type = value_actual_type (value, 0, &real_type_found); |
| 384 | if (real_type_found) |
| 385 | value = value_cast (var->type, value); |
| 386 | } |
| 387 | |
| 388 | /* Set language info */ |
| 389 | var->root->lang_ops = var->root->exp->language_defn->la_varobj_ops; |
| 390 | |
| 391 | install_new_value (var.get (), value, 1 /* Initial assignment */); |
| 392 | |
| 393 | /* Set ourselves as our root. */ |
| 394 | var->root->rootvar = var.get (); |
| 395 | |
| 396 | /* Reset the selected frame. */ |
| 397 | if (frame_id_p (old_id)) |
| 398 | select_frame (frame_find_by_id (old_id)); |
| 399 | } |
| 400 | |
| 401 | /* If the variable object name is null, that means this |
| 402 | is a temporary variable, so don't install it. */ |
| 403 | |
| 404 | if ((var != NULL) && (objname != NULL)) |
| 405 | { |
| 406 | var->obj_name = objname; |
| 407 | |
| 408 | /* If a varobj name is duplicated, the install will fail so |
| 409 | we must cleanup. */ |
| 410 | if (!install_variable (var.get ())) |
| 411 | return NULL; |
| 412 | } |
| 413 | |
| 414 | return var.release (); |
| 415 | } |
| 416 | |
| 417 | /* Generates an unique name that can be used for a varobj. */ |
| 418 | |
| 419 | std::string |
| 420 | varobj_gen_name (void) |
| 421 | { |
| 422 | static int id = 0; |
| 423 | |
| 424 | /* Generate a name for this object. */ |
| 425 | id++; |
| 426 | return string_printf ("var%d", id); |
| 427 | } |
| 428 | |
| 429 | /* Given an OBJNAME, returns the pointer to the corresponding varobj. Call |
| 430 | error if OBJNAME cannot be found. */ |
| 431 | |
| 432 | struct varobj * |
| 433 | varobj_get_handle (const char *objname) |
| 434 | { |
| 435 | struct vlist *cv; |
| 436 | const char *chp; |
| 437 | unsigned int index = 0; |
| 438 | unsigned int i = 1; |
| 439 | |
| 440 | for (chp = objname; *chp; chp++) |
| 441 | { |
| 442 | index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; |
| 443 | } |
| 444 | |
| 445 | cv = *(varobj_table + index); |
| 446 | while (cv != NULL && cv->var->obj_name != objname) |
| 447 | cv = cv->next; |
| 448 | |
| 449 | if (cv == NULL) |
| 450 | error (_("Variable object not found")); |
| 451 | |
| 452 | return cv->var; |
| 453 | } |
| 454 | |
| 455 | /* Given the handle, return the name of the object. */ |
| 456 | |
| 457 | const char * |
| 458 | varobj_get_objname (const struct varobj *var) |
| 459 | { |
| 460 | return var->obj_name.c_str (); |
| 461 | } |
| 462 | |
| 463 | /* Given the handle, return the expression represented by the |
| 464 | object. */ |
| 465 | |
| 466 | std::string |
| 467 | varobj_get_expression (const struct varobj *var) |
| 468 | { |
| 469 | return name_of_variable (var); |
| 470 | } |
| 471 | |
| 472 | /* See varobj.h. */ |
| 473 | |
| 474 | int |
| 475 | varobj_delete (struct varobj *var, bool only_children) |
| 476 | { |
| 477 | return delete_variable (var, only_children); |
| 478 | } |
| 479 | |
| 480 | #if HAVE_PYTHON |
| 481 | |
| 482 | /* Convenience function for varobj_set_visualizer. Instantiate a |
| 483 | pretty-printer for a given value. */ |
| 484 | static PyObject * |
| 485 | instantiate_pretty_printer (PyObject *constructor, struct value *value) |
| 486 | { |
| 487 | PyObject *val_obj = NULL; |
| 488 | PyObject *printer; |
| 489 | |
| 490 | val_obj = value_to_value_object (value); |
| 491 | if (! val_obj) |
| 492 | return NULL; |
| 493 | |
| 494 | printer = PyObject_CallFunctionObjArgs (constructor, val_obj, NULL); |
| 495 | Py_DECREF (val_obj); |
| 496 | return printer; |
| 497 | } |
| 498 | |
| 499 | #endif |
| 500 | |
| 501 | /* Set/Get variable object display format. */ |
| 502 | |
| 503 | enum varobj_display_formats |
| 504 | varobj_set_display_format (struct varobj *var, |
| 505 | enum varobj_display_formats format) |
| 506 | { |
| 507 | switch (format) |
| 508 | { |
| 509 | case FORMAT_NATURAL: |
| 510 | case FORMAT_BINARY: |
| 511 | case FORMAT_DECIMAL: |
| 512 | case FORMAT_HEXADECIMAL: |
| 513 | case FORMAT_OCTAL: |
| 514 | case FORMAT_ZHEXADECIMAL: |
| 515 | var->format = format; |
| 516 | break; |
| 517 | |
| 518 | default: |
| 519 | var->format = variable_default_display (var); |
| 520 | } |
| 521 | |
| 522 | if (varobj_value_is_changeable_p (var) |
| 523 | && var->value != nullptr && !value_lazy (var->value.get ())) |
| 524 | { |
| 525 | var->print_value = varobj_value_get_print_value (var->value.get (), |
| 526 | var->format, var); |
| 527 | } |
| 528 | |
| 529 | return var->format; |
| 530 | } |
| 531 | |
| 532 | enum varobj_display_formats |
| 533 | varobj_get_display_format (const struct varobj *var) |
| 534 | { |
| 535 | return var->format; |
| 536 | } |
| 537 | |
| 538 | gdb::unique_xmalloc_ptr<char> |
| 539 | varobj_get_display_hint (const struct varobj *var) |
| 540 | { |
| 541 | gdb::unique_xmalloc_ptr<char> result; |
| 542 | |
| 543 | #if HAVE_PYTHON |
| 544 | if (!gdb_python_initialized) |
| 545 | return NULL; |
| 546 | |
| 547 | gdbpy_enter_varobj enter_py (var); |
| 548 | |
| 549 | if (var->dynamic->pretty_printer != NULL) |
| 550 | result = gdbpy_get_display_hint (var->dynamic->pretty_printer); |
| 551 | #endif |
| 552 | |
| 553 | return result; |
| 554 | } |
| 555 | |
| 556 | /* Return true if the varobj has items after TO, false otherwise. */ |
| 557 | |
| 558 | bool |
| 559 | varobj_has_more (const struct varobj *var, int to) |
| 560 | { |
| 561 | if (var->children.size () > to) |
| 562 | return true; |
| 563 | |
| 564 | return ((to == -1 || var->children.size () == to) |
| 565 | && (var->dynamic->saved_item != NULL)); |
| 566 | } |
| 567 | |
| 568 | /* If the variable object is bound to a specific thread, that |
| 569 | is its evaluation can always be done in context of a frame |
| 570 | inside that thread, returns GDB id of the thread -- which |
| 571 | is always positive. Otherwise, returns -1. */ |
| 572 | int |
| 573 | varobj_get_thread_id (const struct varobj *var) |
| 574 | { |
| 575 | if (var->root->valid_block && var->root->thread_id > 0) |
| 576 | return var->root->thread_id; |
| 577 | else |
| 578 | return -1; |
| 579 | } |
| 580 | |
| 581 | void |
| 582 | varobj_set_frozen (struct varobj *var, bool frozen) |
| 583 | { |
| 584 | /* When a variable is unfrozen, we don't fetch its value. |
| 585 | The 'not_fetched' flag remains set, so next -var-update |
| 586 | won't complain. |
| 587 | |
| 588 | We don't fetch the value, because for structures the client |
| 589 | should do -var-update anyway. It would be bad to have different |
| 590 | client-size logic for structure and other types. */ |
| 591 | var->frozen = frozen; |
| 592 | } |
| 593 | |
| 594 | bool |
| 595 | varobj_get_frozen (const struct varobj *var) |
| 596 | { |
| 597 | return var->frozen; |
| 598 | } |
| 599 | |
| 600 | /* A helper function that restricts a range to what is actually |
| 601 | available in a VEC. This follows the usual rules for the meaning |
| 602 | of FROM and TO -- if either is negative, the entire range is |
| 603 | used. */ |
| 604 | |
| 605 | void |
| 606 | varobj_restrict_range (const std::vector<varobj *> &children, |
| 607 | int *from, int *to) |
| 608 | { |
| 609 | int len = children.size (); |
| 610 | |
| 611 | if (*from < 0 || *to < 0) |
| 612 | { |
| 613 | *from = 0; |
| 614 | *to = len; |
| 615 | } |
| 616 | else |
| 617 | { |
| 618 | if (*from > len) |
| 619 | *from = len; |
| 620 | if (*to > len) |
| 621 | *to = len; |
| 622 | if (*from > *to) |
| 623 | *from = *to; |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | /* A helper for update_dynamic_varobj_children that installs a new |
| 628 | child when needed. */ |
| 629 | |
| 630 | static void |
| 631 | install_dynamic_child (struct varobj *var, |
| 632 | std::vector<varobj *> *changed, |
| 633 | std::vector<varobj *> *type_changed, |
| 634 | std::vector<varobj *> *newobj, |
| 635 | std::vector<varobj *> *unchanged, |
| 636 | bool *cchanged, |
| 637 | int index, |
| 638 | struct varobj_item *item) |
| 639 | { |
| 640 | if (var->children.size () < index + 1) |
| 641 | { |
| 642 | /* There's no child yet. */ |
| 643 | struct varobj *child = varobj_add_child (var, item); |
| 644 | |
| 645 | if (newobj != NULL) |
| 646 | { |
| 647 | newobj->push_back (child); |
| 648 | *cchanged = true; |
| 649 | } |
| 650 | } |
| 651 | else |
| 652 | { |
| 653 | varobj *existing = var->children[index]; |
| 654 | bool type_updated = update_type_if_necessary (existing, item->value); |
| 655 | |
| 656 | if (type_updated) |
| 657 | { |
| 658 | if (type_changed != NULL) |
| 659 | type_changed->push_back (existing); |
| 660 | } |
| 661 | if (install_new_value (existing, item->value, 0)) |
| 662 | { |
| 663 | if (!type_updated && changed != NULL) |
| 664 | changed->push_back (existing); |
| 665 | } |
| 666 | else if (!type_updated && unchanged != NULL) |
| 667 | unchanged->push_back (existing); |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | #if HAVE_PYTHON |
| 672 | |
| 673 | static bool |
| 674 | dynamic_varobj_has_child_method (const struct varobj *var) |
| 675 | { |
| 676 | PyObject *printer = var->dynamic->pretty_printer; |
| 677 | |
| 678 | if (!gdb_python_initialized) |
| 679 | return false; |
| 680 | |
| 681 | gdbpy_enter_varobj enter_py (var); |
| 682 | return PyObject_HasAttr (printer, gdbpy_children_cst); |
| 683 | } |
| 684 | #endif |
| 685 | |
| 686 | /* A factory for creating dynamic varobj's iterators. Returns an |
| 687 | iterator object suitable for iterating over VAR's children. */ |
| 688 | |
| 689 | static struct varobj_iter * |
| 690 | varobj_get_iterator (struct varobj *var) |
| 691 | { |
| 692 | #if HAVE_PYTHON |
| 693 | if (var->dynamic->pretty_printer) |
| 694 | return py_varobj_get_iterator (var, var->dynamic->pretty_printer); |
| 695 | #endif |
| 696 | |
| 697 | gdb_assert_not_reached (_("\ |
| 698 | requested an iterator from a non-dynamic varobj")); |
| 699 | } |
| 700 | |
| 701 | /* Release and clear VAR's saved item, if any. */ |
| 702 | |
| 703 | static void |
| 704 | varobj_clear_saved_item (struct varobj_dynamic *var) |
| 705 | { |
| 706 | if (var->saved_item != NULL) |
| 707 | { |
| 708 | value_decref (var->saved_item->value); |
| 709 | delete var->saved_item; |
| 710 | var->saved_item = NULL; |
| 711 | } |
| 712 | } |
| 713 | |
| 714 | static bool |
| 715 | update_dynamic_varobj_children (struct varobj *var, |
| 716 | std::vector<varobj *> *changed, |
| 717 | std::vector<varobj *> *type_changed, |
| 718 | std::vector<varobj *> *newobj, |
| 719 | std::vector<varobj *> *unchanged, |
| 720 | bool *cchanged, |
| 721 | bool update_children, |
| 722 | int from, |
| 723 | int to) |
| 724 | { |
| 725 | int i; |
| 726 | |
| 727 | *cchanged = false; |
| 728 | |
| 729 | if (update_children || var->dynamic->child_iter == NULL) |
| 730 | { |
| 731 | varobj_iter_delete (var->dynamic->child_iter); |
| 732 | var->dynamic->child_iter = varobj_get_iterator (var); |
| 733 | |
| 734 | varobj_clear_saved_item (var->dynamic); |
| 735 | |
| 736 | i = 0; |
| 737 | |
| 738 | if (var->dynamic->child_iter == NULL) |
| 739 | return false; |
| 740 | } |
| 741 | else |
| 742 | i = var->children.size (); |
| 743 | |
| 744 | /* We ask for one extra child, so that MI can report whether there |
| 745 | are more children. */ |
| 746 | for (; to < 0 || i < to + 1; ++i) |
| 747 | { |
| 748 | varobj_item *item; |
| 749 | |
| 750 | /* See if there was a leftover from last time. */ |
| 751 | if (var->dynamic->saved_item != NULL) |
| 752 | { |
| 753 | item = var->dynamic->saved_item; |
| 754 | var->dynamic->saved_item = NULL; |
| 755 | } |
| 756 | else |
| 757 | { |
| 758 | item = varobj_iter_next (var->dynamic->child_iter); |
| 759 | /* Release vitem->value so its lifetime is not bound to the |
| 760 | execution of a command. */ |
| 761 | if (item != NULL && item->value != NULL) |
| 762 | item->value = release_value (item->value).release (); |
| 763 | } |
| 764 | |
| 765 | if (item == NULL) |
| 766 | { |
| 767 | /* Iteration is done. Remove iterator from VAR. */ |
| 768 | varobj_iter_delete (var->dynamic->child_iter); |
| 769 | var->dynamic->child_iter = NULL; |
| 770 | break; |
| 771 | } |
| 772 | /* We don't want to push the extra child on any report list. */ |
| 773 | if (to < 0 || i < to) |
| 774 | { |
| 775 | bool can_mention = from < 0 || i >= from; |
| 776 | |
| 777 | install_dynamic_child (var, can_mention ? changed : NULL, |
| 778 | can_mention ? type_changed : NULL, |
| 779 | can_mention ? newobj : NULL, |
| 780 | can_mention ? unchanged : NULL, |
| 781 | can_mention ? cchanged : NULL, i, |
| 782 | item); |
| 783 | |
| 784 | delete item; |
| 785 | } |
| 786 | else |
| 787 | { |
| 788 | var->dynamic->saved_item = item; |
| 789 | |
| 790 | /* We want to truncate the child list just before this |
| 791 | element. */ |
| 792 | break; |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | if (i < var->children.size ()) |
| 797 | { |
| 798 | *cchanged = true; |
| 799 | for (int j = i; j < var->children.size (); ++j) |
| 800 | varobj_delete (var->children[j], 0); |
| 801 | |
| 802 | var->children.resize (i); |
| 803 | } |
| 804 | |
| 805 | /* If there are fewer children than requested, note that the list of |
| 806 | children changed. */ |
| 807 | if (to >= 0 && var->children.size () < to) |
| 808 | *cchanged = true; |
| 809 | |
| 810 | var->num_children = var->children.size (); |
| 811 | |
| 812 | return true; |
| 813 | } |
| 814 | |
| 815 | int |
| 816 | varobj_get_num_children (struct varobj *var) |
| 817 | { |
| 818 | if (var->num_children == -1) |
| 819 | { |
| 820 | if (varobj_is_dynamic_p (var)) |
| 821 | { |
| 822 | bool dummy; |
| 823 | |
| 824 | /* If we have a dynamic varobj, don't report -1 children. |
| 825 | So, try to fetch some children first. */ |
| 826 | update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, &dummy, |
| 827 | false, 0, 0); |
| 828 | } |
| 829 | else |
| 830 | var->num_children = number_of_children (var); |
| 831 | } |
| 832 | |
| 833 | return var->num_children >= 0 ? var->num_children : 0; |
| 834 | } |
| 835 | |
| 836 | /* Creates a list of the immediate children of a variable object; |
| 837 | the return code is the number of such children or -1 on error. */ |
| 838 | |
| 839 | const std::vector<varobj *> & |
| 840 | varobj_list_children (struct varobj *var, int *from, int *to) |
| 841 | { |
| 842 | var->dynamic->children_requested = true; |
| 843 | |
| 844 | if (varobj_is_dynamic_p (var)) |
| 845 | { |
| 846 | bool children_changed; |
| 847 | |
| 848 | /* This, in theory, can result in the number of children changing without |
| 849 | frontend noticing. But well, calling -var-list-children on the same |
| 850 | varobj twice is not something a sane frontend would do. */ |
| 851 | update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, |
| 852 | &children_changed, false, 0, *to); |
| 853 | varobj_restrict_range (var->children, from, to); |
| 854 | return var->children; |
| 855 | } |
| 856 | |
| 857 | if (var->num_children == -1) |
| 858 | var->num_children = number_of_children (var); |
| 859 | |
| 860 | /* If that failed, give up. */ |
| 861 | if (var->num_children == -1) |
| 862 | return var->children; |
| 863 | |
| 864 | /* If we're called when the list of children is not yet initialized, |
| 865 | allocate enough elements in it. */ |
| 866 | while (var->children.size () < var->num_children) |
| 867 | var->children.push_back (NULL); |
| 868 | |
| 869 | for (int i = 0; i < var->num_children; i++) |
| 870 | { |
| 871 | if (var->children[i] == NULL) |
| 872 | { |
| 873 | /* Either it's the first call to varobj_list_children for |
| 874 | this variable object, and the child was never created, |
| 875 | or it was explicitly deleted by the client. */ |
| 876 | std::string name = name_of_child (var, i); |
| 877 | var->children[i] = create_child (var, i, name); |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | varobj_restrict_range (var->children, from, to); |
| 882 | return var->children; |
| 883 | } |
| 884 | |
| 885 | static struct varobj * |
| 886 | varobj_add_child (struct varobj *var, struct varobj_item *item) |
| 887 | { |
| 888 | varobj *v = create_child_with_value (var, var->children.size (), item); |
| 889 | |
| 890 | var->children.push_back (v); |
| 891 | |
| 892 | return v; |
| 893 | } |
| 894 | |
| 895 | /* Obtain the type of an object Variable as a string similar to the one gdb |
| 896 | prints on the console. The caller is responsible for freeing the string. |
| 897 | */ |
| 898 | |
| 899 | std::string |
| 900 | varobj_get_type (struct varobj *var) |
| 901 | { |
| 902 | /* For the "fake" variables, do not return a type. (Its type is |
| 903 | NULL, too.) |
| 904 | Do not return a type for invalid variables as well. */ |
| 905 | if (CPLUS_FAKE_CHILD (var) || !var->root->is_valid) |
| 906 | return std::string (); |
| 907 | |
| 908 | return type_to_string (var->type); |
| 909 | } |
| 910 | |
| 911 | /* Obtain the type of an object variable. */ |
| 912 | |
| 913 | struct type * |
| 914 | varobj_get_gdb_type (const struct varobj *var) |
| 915 | { |
| 916 | return var->type; |
| 917 | } |
| 918 | |
| 919 | /* Is VAR a path expression parent, i.e., can it be used to construct |
| 920 | a valid path expression? */ |
| 921 | |
| 922 | static bool |
| 923 | is_path_expr_parent (const struct varobj *var) |
| 924 | { |
| 925 | gdb_assert (var->root->lang_ops->is_path_expr_parent != NULL); |
| 926 | return var->root->lang_ops->is_path_expr_parent (var); |
| 927 | } |
| 928 | |
| 929 | /* Is VAR a path expression parent, i.e., can it be used to construct |
| 930 | a valid path expression? By default we assume any VAR can be a path |
| 931 | parent. */ |
| 932 | |
| 933 | bool |
| 934 | varobj_default_is_path_expr_parent (const struct varobj *var) |
| 935 | { |
| 936 | return true; |
| 937 | } |
| 938 | |
| 939 | /* Return the path expression parent for VAR. */ |
| 940 | |
| 941 | const struct varobj * |
| 942 | varobj_get_path_expr_parent (const struct varobj *var) |
| 943 | { |
| 944 | const struct varobj *parent = var; |
| 945 | |
| 946 | while (!is_root_p (parent) && !is_path_expr_parent (parent)) |
| 947 | parent = parent->parent; |
| 948 | |
| 949 | /* Computation of full rooted expression for children of dynamic |
| 950 | varobjs is not supported. */ |
| 951 | if (varobj_is_dynamic_p (parent)) |
| 952 | error (_("Invalid variable object (child of a dynamic varobj)")); |
| 953 | |
| 954 | return parent; |
| 955 | } |
| 956 | |
| 957 | /* Return a pointer to the full rooted expression of varobj VAR. |
| 958 | If it has not been computed yet, compute it. */ |
| 959 | |
| 960 | const char * |
| 961 | varobj_get_path_expr (const struct varobj *var) |
| 962 | { |
| 963 | if (var->path_expr.empty ()) |
| 964 | { |
| 965 | /* For root varobjs, we initialize path_expr |
| 966 | when creating varobj, so here it should be |
| 967 | child varobj. */ |
| 968 | struct varobj *mutable_var = (struct varobj *) var; |
| 969 | gdb_assert (!is_root_p (var)); |
| 970 | |
| 971 | mutable_var->path_expr = (*var->root->lang_ops->path_expr_of_child) (var); |
| 972 | } |
| 973 | |
| 974 | return var->path_expr.c_str (); |
| 975 | } |
| 976 | |
| 977 | const struct language_defn * |
| 978 | varobj_get_language (const struct varobj *var) |
| 979 | { |
| 980 | return var->root->exp->language_defn; |
| 981 | } |
| 982 | |
| 983 | int |
| 984 | varobj_get_attributes (const struct varobj *var) |
| 985 | { |
| 986 | int attributes = 0; |
| 987 | |
| 988 | if (varobj_editable_p (var)) |
| 989 | /* FIXME: define masks for attributes. */ |
| 990 | attributes |= 0x00000001; /* Editable */ |
| 991 | |
| 992 | return attributes; |
| 993 | } |
| 994 | |
| 995 | /* Return true if VAR is a dynamic varobj. */ |
| 996 | |
| 997 | bool |
| 998 | varobj_is_dynamic_p (const struct varobj *var) |
| 999 | { |
| 1000 | return var->dynamic->pretty_printer != NULL; |
| 1001 | } |
| 1002 | |
| 1003 | std::string |
| 1004 | varobj_get_formatted_value (struct varobj *var, |
| 1005 | enum varobj_display_formats format) |
| 1006 | { |
| 1007 | return my_value_of_variable (var, format); |
| 1008 | } |
| 1009 | |
| 1010 | std::string |
| 1011 | varobj_get_value (struct varobj *var) |
| 1012 | { |
| 1013 | return my_value_of_variable (var, var->format); |
| 1014 | } |
| 1015 | |
| 1016 | /* Set the value of an object variable (if it is editable) to the |
| 1017 | value of the given expression. */ |
| 1018 | /* Note: Invokes functions that can call error(). */ |
| 1019 | |
| 1020 | bool |
| 1021 | varobj_set_value (struct varobj *var, const char *expression) |
| 1022 | { |
| 1023 | struct value *val = NULL; /* Initialize to keep gcc happy. */ |
| 1024 | /* The argument "expression" contains the variable's new value. |
| 1025 | We need to first construct a legal expression for this -- ugh! */ |
| 1026 | /* Does this cover all the bases? */ |
| 1027 | struct value *value = NULL; /* Initialize to keep gcc happy. */ |
| 1028 | int saved_input_radix = input_radix; |
| 1029 | const char *s = expression; |
| 1030 | |
| 1031 | gdb_assert (varobj_editable_p (var)); |
| 1032 | |
| 1033 | input_radix = 10; /* ALWAYS reset to decimal temporarily. */ |
| 1034 | expression_up exp = parse_exp_1 (&s, 0, 0, 0); |
| 1035 | try |
| 1036 | { |
| 1037 | value = evaluate_expression (exp.get ()); |
| 1038 | } |
| 1039 | |
| 1040 | catch (const gdb_exception_error &except) |
| 1041 | { |
| 1042 | /* We cannot proceed without a valid expression. */ |
| 1043 | return false; |
| 1044 | } |
| 1045 | |
| 1046 | /* All types that are editable must also be changeable. */ |
| 1047 | gdb_assert (varobj_value_is_changeable_p (var)); |
| 1048 | |
| 1049 | /* The value of a changeable variable object must not be lazy. */ |
| 1050 | gdb_assert (!value_lazy (var->value.get ())); |
| 1051 | |
| 1052 | /* Need to coerce the input. We want to check if the |
| 1053 | value of the variable object will be different |
| 1054 | after assignment, and the first thing value_assign |
| 1055 | does is coerce the input. |
| 1056 | For example, if we are assigning an array to a pointer variable we |
| 1057 | should compare the pointer with the array's address, not with the |
| 1058 | array's content. */ |
| 1059 | value = coerce_array (value); |
| 1060 | |
| 1061 | /* The new value may be lazy. value_assign, or |
| 1062 | rather value_contents, will take care of this. */ |
| 1063 | try |
| 1064 | { |
| 1065 | val = value_assign (var->value.get (), value); |
| 1066 | } |
| 1067 | |
| 1068 | catch (const gdb_exception_error &except) |
| 1069 | { |
| 1070 | return false; |
| 1071 | } |
| 1072 | |
| 1073 | /* If the value has changed, record it, so that next -var-update can |
| 1074 | report this change. If a variable had a value of '1', we've set it |
| 1075 | to '333' and then set again to '1', when -var-update will report this |
| 1076 | variable as changed -- because the first assignment has set the |
| 1077 | 'updated' flag. There's no need to optimize that, because return value |
| 1078 | of -var-update should be considered an approximation. */ |
| 1079 | var->updated = install_new_value (var, val, false /* Compare values. */); |
| 1080 | input_radix = saved_input_radix; |
| 1081 | return true; |
| 1082 | } |
| 1083 | |
| 1084 | #if HAVE_PYTHON |
| 1085 | |
| 1086 | /* A helper function to install a constructor function and visualizer |
| 1087 | in a varobj_dynamic. */ |
| 1088 | |
| 1089 | static void |
| 1090 | install_visualizer (struct varobj_dynamic *var, PyObject *constructor, |
| 1091 | PyObject *visualizer) |
| 1092 | { |
| 1093 | Py_XDECREF (var->constructor); |
| 1094 | var->constructor = constructor; |
| 1095 | |
| 1096 | Py_XDECREF (var->pretty_printer); |
| 1097 | var->pretty_printer = visualizer; |
| 1098 | |
| 1099 | varobj_iter_delete (var->child_iter); |
| 1100 | var->child_iter = NULL; |
| 1101 | } |
| 1102 | |
| 1103 | /* Install the default visualizer for VAR. */ |
| 1104 | |
| 1105 | static void |
| 1106 | install_default_visualizer (struct varobj *var) |
| 1107 | { |
| 1108 | /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
| 1109 | if (CPLUS_FAKE_CHILD (var)) |
| 1110 | return; |
| 1111 | |
| 1112 | if (pretty_printing) |
| 1113 | { |
| 1114 | gdbpy_ref<> pretty_printer; |
| 1115 | |
| 1116 | if (var->value != nullptr) |
| 1117 | { |
| 1118 | pretty_printer = gdbpy_get_varobj_pretty_printer (var->value.get ()); |
| 1119 | if (pretty_printer == nullptr) |
| 1120 | { |
| 1121 | gdbpy_print_stack (); |
| 1122 | error (_("Cannot instantiate printer for default visualizer")); |
| 1123 | } |
| 1124 | } |
| 1125 | |
| 1126 | if (pretty_printer == Py_None) |
| 1127 | pretty_printer.reset (nullptr); |
| 1128 | |
| 1129 | install_visualizer (var->dynamic, NULL, pretty_printer.release ()); |
| 1130 | } |
| 1131 | } |
| 1132 | |
| 1133 | /* Instantiate and install a visualizer for VAR using CONSTRUCTOR to |
| 1134 | make a new object. */ |
| 1135 | |
| 1136 | static void |
| 1137 | construct_visualizer (struct varobj *var, PyObject *constructor) |
| 1138 | { |
| 1139 | PyObject *pretty_printer; |
| 1140 | |
| 1141 | /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
| 1142 | if (CPLUS_FAKE_CHILD (var)) |
| 1143 | return; |
| 1144 | |
| 1145 | Py_INCREF (constructor); |
| 1146 | if (constructor == Py_None) |
| 1147 | pretty_printer = NULL; |
| 1148 | else |
| 1149 | { |
| 1150 | pretty_printer = instantiate_pretty_printer (constructor, |
| 1151 | var->value.get ()); |
| 1152 | if (! pretty_printer) |
| 1153 | { |
| 1154 | gdbpy_print_stack (); |
| 1155 | Py_DECREF (constructor); |
| 1156 | constructor = Py_None; |
| 1157 | Py_INCREF (constructor); |
| 1158 | } |
| 1159 | |
| 1160 | if (pretty_printer == Py_None) |
| 1161 | { |
| 1162 | Py_DECREF (pretty_printer); |
| 1163 | pretty_printer = NULL; |
| 1164 | } |
| 1165 | } |
| 1166 | |
| 1167 | install_visualizer (var->dynamic, constructor, pretty_printer); |
| 1168 | } |
| 1169 | |
| 1170 | #endif /* HAVE_PYTHON */ |
| 1171 | |
| 1172 | /* A helper function for install_new_value. This creates and installs |
| 1173 | a visualizer for VAR, if appropriate. */ |
| 1174 | |
| 1175 | static void |
| 1176 | install_new_value_visualizer (struct varobj *var) |
| 1177 | { |
| 1178 | #if HAVE_PYTHON |
| 1179 | /* If the constructor is None, then we want the raw value. If VAR |
| 1180 | does not have a value, just skip this. */ |
| 1181 | if (!gdb_python_initialized) |
| 1182 | return; |
| 1183 | |
| 1184 | if (var->dynamic->constructor != Py_None && var->value != NULL) |
| 1185 | { |
| 1186 | gdbpy_enter_varobj enter_py (var); |
| 1187 | |
| 1188 | if (var->dynamic->constructor == NULL) |
| 1189 | install_default_visualizer (var); |
| 1190 | else |
| 1191 | construct_visualizer (var, var->dynamic->constructor); |
| 1192 | } |
| 1193 | #else |
| 1194 | /* Do nothing. */ |
| 1195 | #endif |
| 1196 | } |
| 1197 | |
| 1198 | /* When using RTTI to determine variable type it may be changed in runtime when |
| 1199 | the variable value is changed. This function checks whether type of varobj |
| 1200 | VAR will change when a new value NEW_VALUE is assigned and if it is so |
| 1201 | updates the type of VAR. */ |
| 1202 | |
| 1203 | static bool |
| 1204 | update_type_if_necessary (struct varobj *var, struct value *new_value) |
| 1205 | { |
| 1206 | if (new_value) |
| 1207 | { |
| 1208 | struct value_print_options opts; |
| 1209 | |
| 1210 | get_user_print_options (&opts); |
| 1211 | if (opts.objectprint) |
| 1212 | { |
| 1213 | struct type *new_type = value_actual_type (new_value, 0, 0); |
| 1214 | std::string new_type_str = type_to_string (new_type); |
| 1215 | std::string curr_type_str = varobj_get_type (var); |
| 1216 | |
| 1217 | /* Did the type name change? */ |
| 1218 | if (curr_type_str != new_type_str) |
| 1219 | { |
| 1220 | var->type = new_type; |
| 1221 | |
| 1222 | /* This information may be not valid for a new type. */ |
| 1223 | varobj_delete (var, 1); |
| 1224 | var->children.clear (); |
| 1225 | var->num_children = -1; |
| 1226 | return true; |
| 1227 | } |
| 1228 | } |
| 1229 | } |
| 1230 | |
| 1231 | return false; |
| 1232 | } |
| 1233 | |
| 1234 | /* Assign a new value to a variable object. If INITIAL is true, |
| 1235 | this is the first assignment after the variable object was just |
| 1236 | created, or changed type. In that case, just assign the value |
| 1237 | and return false. |
| 1238 | Otherwise, assign the new value, and return true if the value is |
| 1239 | different from the current one, false otherwise. The comparison is |
| 1240 | done on textual representation of value. Therefore, some types |
| 1241 | need not be compared. E.g. for structures the reported value is |
| 1242 | always "{...}", so no comparison is necessary here. If the old |
| 1243 | value was NULL and new one is not, or vice versa, we always return true. |
| 1244 | |
| 1245 | The VALUE parameter should not be released -- the function will |
| 1246 | take care of releasing it when needed. */ |
| 1247 | static bool |
| 1248 | install_new_value (struct varobj *var, struct value *value, bool initial) |
| 1249 | { |
| 1250 | bool changeable; |
| 1251 | bool need_to_fetch; |
| 1252 | bool changed = false; |
| 1253 | bool intentionally_not_fetched = false; |
| 1254 | |
| 1255 | /* We need to know the varobj's type to decide if the value should |
| 1256 | be fetched or not. C++ fake children (public/protected/private) |
| 1257 | don't have a type. */ |
| 1258 | gdb_assert (var->type || CPLUS_FAKE_CHILD (var)); |
| 1259 | changeable = varobj_value_is_changeable_p (var); |
| 1260 | |
| 1261 | /* If the type has custom visualizer, we consider it to be always |
| 1262 | changeable. FIXME: need to make sure this behaviour will not |
| 1263 | mess up read-sensitive values. */ |
| 1264 | if (var->dynamic->pretty_printer != NULL) |
| 1265 | changeable = true; |
| 1266 | |
| 1267 | need_to_fetch = changeable; |
| 1268 | |
| 1269 | /* We are not interested in the address of references, and given |
| 1270 | that in C++ a reference is not rebindable, it cannot |
| 1271 | meaningfully change. So, get hold of the real value. */ |
| 1272 | if (value) |
| 1273 | value = coerce_ref (value); |
| 1274 | |
| 1275 | if (var->type && TYPE_CODE (var->type) == TYPE_CODE_UNION) |
| 1276 | /* For unions, we need to fetch the value implicitly because |
| 1277 | of implementation of union member fetch. When gdb |
| 1278 | creates a value for a field and the value of the enclosing |
| 1279 | structure is not lazy, it immediately copies the necessary |
| 1280 | bytes from the enclosing values. If the enclosing value is |
| 1281 | lazy, the call to value_fetch_lazy on the field will read |
| 1282 | the data from memory. For unions, that means we'll read the |
| 1283 | same memory more than once, which is not desirable. So |
| 1284 | fetch now. */ |
| 1285 | need_to_fetch = true; |
| 1286 | |
| 1287 | /* The new value might be lazy. If the type is changeable, |
| 1288 | that is we'll be comparing values of this type, fetch the |
| 1289 | value now. Otherwise, on the next update the old value |
| 1290 | will be lazy, which means we've lost that old value. */ |
| 1291 | if (need_to_fetch && value && value_lazy (value)) |
| 1292 | { |
| 1293 | const struct varobj *parent = var->parent; |
| 1294 | bool frozen = var->frozen; |
| 1295 | |
| 1296 | for (; !frozen && parent; parent = parent->parent) |
| 1297 | frozen |= parent->frozen; |
| 1298 | |
| 1299 | if (frozen && initial) |
| 1300 | { |
| 1301 | /* For variables that are frozen, or are children of frozen |
| 1302 | variables, we don't do fetch on initial assignment. |
| 1303 | For non-initial assignemnt we do the fetch, since it means we're |
| 1304 | explicitly asked to compare the new value with the old one. */ |
| 1305 | intentionally_not_fetched = true; |
| 1306 | } |
| 1307 | else |
| 1308 | { |
| 1309 | |
| 1310 | try |
| 1311 | { |
| 1312 | value_fetch_lazy (value); |
| 1313 | } |
| 1314 | |
| 1315 | catch (const gdb_exception_error &except) |
| 1316 | { |
| 1317 | /* Set the value to NULL, so that for the next -var-update, |
| 1318 | we don't try to compare the new value with this value, |
| 1319 | that we couldn't even read. */ |
| 1320 | value = NULL; |
| 1321 | } |
| 1322 | } |
| 1323 | } |
| 1324 | |
| 1325 | /* Get a reference now, before possibly passing it to any Python |
| 1326 | code that might release it. */ |
| 1327 | value_ref_ptr value_holder; |
| 1328 | if (value != NULL) |
| 1329 | value_holder = value_ref_ptr::new_reference (value); |
| 1330 | |
| 1331 | /* Below, we'll be comparing string rendering of old and new |
| 1332 | values. Don't get string rendering if the value is |
| 1333 | lazy -- if it is, the code above has decided that the value |
| 1334 | should not be fetched. */ |
| 1335 | std::string print_value; |
| 1336 | if (value != NULL && !value_lazy (value) |
| 1337 | && var->dynamic->pretty_printer == NULL) |
| 1338 | print_value = varobj_value_get_print_value (value, var->format, var); |
| 1339 | |
| 1340 | /* If the type is changeable, compare the old and the new values. |
| 1341 | If this is the initial assignment, we don't have any old value |
| 1342 | to compare with. */ |
| 1343 | if (!initial && changeable) |
| 1344 | { |
| 1345 | /* If the value of the varobj was changed by -var-set-value, |
| 1346 | then the value in the varobj and in the target is the same. |
| 1347 | However, that value is different from the value that the |
| 1348 | varobj had after the previous -var-update. So need to the |
| 1349 | varobj as changed. */ |
| 1350 | if (var->updated) |
| 1351 | changed = true; |
| 1352 | else if (var->dynamic->pretty_printer == NULL) |
| 1353 | { |
| 1354 | /* Try to compare the values. That requires that both |
| 1355 | values are non-lazy. */ |
| 1356 | if (var->not_fetched && value_lazy (var->value.get ())) |
| 1357 | { |
| 1358 | /* This is a frozen varobj and the value was never read. |
| 1359 | Presumably, UI shows some "never read" indicator. |
| 1360 | Now that we've fetched the real value, we need to report |
| 1361 | this varobj as changed so that UI can show the real |
| 1362 | value. */ |
| 1363 | changed = true; |
| 1364 | } |
| 1365 | else if (var->value == NULL && value == NULL) |
| 1366 | /* Equal. */ |
| 1367 | ; |
| 1368 | else if (var->value == NULL || value == NULL) |
| 1369 | { |
| 1370 | changed = true; |
| 1371 | } |
| 1372 | else |
| 1373 | { |
| 1374 | gdb_assert (!value_lazy (var->value.get ())); |
| 1375 | gdb_assert (!value_lazy (value)); |
| 1376 | |
| 1377 | gdb_assert (!var->print_value.empty () && !print_value.empty ()); |
| 1378 | if (var->print_value != print_value) |
| 1379 | changed = true; |
| 1380 | } |
| 1381 | } |
| 1382 | } |
| 1383 | |
| 1384 | if (!initial && !changeable) |
| 1385 | { |
| 1386 | /* For values that are not changeable, we don't compare the values. |
| 1387 | However, we want to notice if a value was not NULL and now is NULL, |
| 1388 | or vise versa, so that we report when top-level varobjs come in scope |
| 1389 | and leave the scope. */ |
| 1390 | changed = (var->value != NULL) != (value != NULL); |
| 1391 | } |
| 1392 | |
| 1393 | /* We must always keep the new value, since children depend on it. */ |
| 1394 | var->value = value_holder; |
| 1395 | if (value && value_lazy (value) && intentionally_not_fetched) |
| 1396 | var->not_fetched = true; |
| 1397 | else |
| 1398 | var->not_fetched = false; |
| 1399 | var->updated = false; |
| 1400 | |
| 1401 | install_new_value_visualizer (var); |
| 1402 | |
| 1403 | /* If we installed a pretty-printer, re-compare the printed version |
| 1404 | to see if the variable changed. */ |
| 1405 | if (var->dynamic->pretty_printer != NULL) |
| 1406 | { |
| 1407 | print_value = varobj_value_get_print_value (var->value.get (), |
| 1408 | var->format, var); |
| 1409 | if ((var->print_value.empty () && !print_value.empty ()) |
| 1410 | || (!var->print_value.empty () && print_value.empty ()) |
| 1411 | || (!var->print_value.empty () && !print_value.empty () |
| 1412 | && var->print_value != print_value)) |
| 1413 | changed = true; |
| 1414 | } |
| 1415 | var->print_value = print_value; |
| 1416 | |
| 1417 | gdb_assert (var->value == nullptr || value_type (var->value.get ())); |
| 1418 | |
| 1419 | return changed; |
| 1420 | } |
| 1421 | |
| 1422 | /* Return the requested range for a varobj. VAR is the varobj. FROM |
| 1423 | and TO are out parameters; *FROM and *TO will be set to the |
| 1424 | selected sub-range of VAR. If no range was selected using |
| 1425 | -var-set-update-range, then both will be -1. */ |
| 1426 | void |
| 1427 | varobj_get_child_range (const struct varobj *var, int *from, int *to) |
| 1428 | { |
| 1429 | *from = var->from; |
| 1430 | *to = var->to; |
| 1431 | } |
| 1432 | |
| 1433 | /* Set the selected sub-range of children of VAR to start at index |
| 1434 | FROM and end at index TO. If either FROM or TO is less than zero, |
| 1435 | this is interpreted as a request for all children. */ |
| 1436 | void |
| 1437 | varobj_set_child_range (struct varobj *var, int from, int to) |
| 1438 | { |
| 1439 | var->from = from; |
| 1440 | var->to = to; |
| 1441 | } |
| 1442 | |
| 1443 | void |
| 1444 | varobj_set_visualizer (struct varobj *var, const char *visualizer) |
| 1445 | { |
| 1446 | #if HAVE_PYTHON |
| 1447 | PyObject *mainmod; |
| 1448 | |
| 1449 | if (!gdb_python_initialized) |
| 1450 | return; |
| 1451 | |
| 1452 | gdbpy_enter_varobj enter_py (var); |
| 1453 | |
| 1454 | mainmod = PyImport_AddModule ("__main__"); |
| 1455 | gdbpy_ref<> globals |
| 1456 | = gdbpy_ref<>::new_reference (PyModule_GetDict (mainmod)); |
| 1457 | gdbpy_ref<> constructor (PyRun_String (visualizer, Py_eval_input, |
| 1458 | globals.get (), globals.get ())); |
| 1459 | |
| 1460 | if (constructor == NULL) |
| 1461 | { |
| 1462 | gdbpy_print_stack (); |
| 1463 | error (_("Could not evaluate visualizer expression: %s"), visualizer); |
| 1464 | } |
| 1465 | |
| 1466 | construct_visualizer (var, constructor.get ()); |
| 1467 | |
| 1468 | /* If there are any children now, wipe them. */ |
| 1469 | varobj_delete (var, 1 /* children only */); |
| 1470 | var->num_children = -1; |
| 1471 | #else |
| 1472 | error (_("Python support required")); |
| 1473 | #endif |
| 1474 | } |
| 1475 | |
| 1476 | /* If NEW_VALUE is the new value of the given varobj (var), return |
| 1477 | true if var has mutated. In other words, if the type of |
| 1478 | the new value is different from the type of the varobj's old |
| 1479 | value. |
| 1480 | |
| 1481 | NEW_VALUE may be NULL, if the varobj is now out of scope. */ |
| 1482 | |
| 1483 | static bool |
| 1484 | varobj_value_has_mutated (const struct varobj *var, struct value *new_value, |
| 1485 | struct type *new_type) |
| 1486 | { |
| 1487 | /* If we haven't previously computed the number of children in var, |
| 1488 | it does not matter from the front-end's perspective whether |
| 1489 | the type has mutated or not. For all intents and purposes, |
| 1490 | it has not mutated. */ |
| 1491 | if (var->num_children < 0) |
| 1492 | return false; |
| 1493 | |
| 1494 | if (var->root->lang_ops->value_has_mutated != NULL) |
| 1495 | { |
| 1496 | /* The varobj module, when installing new values, explicitly strips |
| 1497 | references, saying that we're not interested in those addresses. |
| 1498 | But detection of mutation happens before installing the new |
| 1499 | value, so our value may be a reference that we need to strip |
| 1500 | in order to remain consistent. */ |
| 1501 | if (new_value != NULL) |
| 1502 | new_value = coerce_ref (new_value); |
| 1503 | return var->root->lang_ops->value_has_mutated (var, new_value, new_type); |
| 1504 | } |
| 1505 | else |
| 1506 | return false; |
| 1507 | } |
| 1508 | |
| 1509 | /* Update the values for a variable and its children. This is a |
| 1510 | two-pronged attack. First, re-parse the value for the root's |
| 1511 | expression to see if it's changed. Then go all the way |
| 1512 | through its children, reconstructing them and noting if they've |
| 1513 | changed. |
| 1514 | |
| 1515 | The IS_EXPLICIT parameter specifies if this call is result |
| 1516 | of MI request to update this specific variable, or |
| 1517 | result of implicit -var-update *. For implicit request, we don't |
| 1518 | update frozen variables. |
| 1519 | |
| 1520 | NOTE: This function may delete the caller's varobj. If it |
| 1521 | returns TYPE_CHANGED, then it has done this and VARP will be modified |
| 1522 | to point to the new varobj. */ |
| 1523 | |
| 1524 | std::vector<varobj_update_result> |
| 1525 | varobj_update (struct varobj **varp, bool is_explicit) |
| 1526 | { |
| 1527 | bool type_changed = false; |
| 1528 | struct value *newobj; |
| 1529 | std::vector<varobj_update_result> stack; |
| 1530 | std::vector<varobj_update_result> result; |
| 1531 | |
| 1532 | /* Frozen means frozen -- we don't check for any change in |
| 1533 | this varobj, including its going out of scope, or |
| 1534 | changing type. One use case for frozen varobjs is |
| 1535 | retaining previously evaluated expressions, and we don't |
| 1536 | want them to be reevaluated at all. */ |
| 1537 | if (!is_explicit && (*varp)->frozen) |
| 1538 | return result; |
| 1539 | |
| 1540 | if (!(*varp)->root->is_valid) |
| 1541 | { |
| 1542 | result.emplace_back (*varp, VAROBJ_INVALID); |
| 1543 | return result; |
| 1544 | } |
| 1545 | |
| 1546 | if ((*varp)->root->rootvar == *varp) |
| 1547 | { |
| 1548 | varobj_update_result r (*varp); |
| 1549 | |
| 1550 | /* Update the root variable. value_of_root can return NULL |
| 1551 | if the variable is no longer around, i.e. we stepped out of |
| 1552 | the frame in which a local existed. We are letting the |
| 1553 | value_of_root variable dispose of the varobj if the type |
| 1554 | has changed. */ |
| 1555 | newobj = value_of_root (varp, &type_changed); |
| 1556 | if (update_type_if_necessary (*varp, newobj)) |
| 1557 | type_changed = true; |
| 1558 | r.varobj = *varp; |
| 1559 | r.type_changed = type_changed; |
| 1560 | if (install_new_value ((*varp), newobj, type_changed)) |
| 1561 | r.changed = true; |
| 1562 | |
| 1563 | if (newobj == NULL) |
| 1564 | r.status = VAROBJ_NOT_IN_SCOPE; |
| 1565 | r.value_installed = true; |
| 1566 | |
| 1567 | if (r.status == VAROBJ_NOT_IN_SCOPE) |
| 1568 | { |
| 1569 | if (r.type_changed || r.changed) |
| 1570 | result.push_back (std::move (r)); |
| 1571 | |
| 1572 | return result; |
| 1573 | } |
| 1574 | |
| 1575 | stack.push_back (std::move (r)); |
| 1576 | } |
| 1577 | else |
| 1578 | stack.emplace_back (*varp); |
| 1579 | |
| 1580 | /* Walk through the children, reconstructing them all. */ |
| 1581 | while (!stack.empty ()) |
| 1582 | { |
| 1583 | varobj_update_result r = std::move (stack.back ()); |
| 1584 | stack.pop_back (); |
| 1585 | struct varobj *v = r.varobj; |
| 1586 | |
| 1587 | /* Update this variable, unless it's a root, which is already |
| 1588 | updated. */ |
| 1589 | if (!r.value_installed) |
| 1590 | { |
| 1591 | struct type *new_type; |
| 1592 | |
| 1593 | newobj = value_of_child (v->parent, v->index); |
| 1594 | if (update_type_if_necessary (v, newobj)) |
| 1595 | r.type_changed = true; |
| 1596 | if (newobj) |
| 1597 | new_type = value_type (newobj); |
| 1598 | else |
| 1599 | new_type = v->root->lang_ops->type_of_child (v->parent, v->index); |
| 1600 | |
| 1601 | if (varobj_value_has_mutated (v, newobj, new_type)) |
| 1602 | { |
| 1603 | /* The children are no longer valid; delete them now. |
| 1604 | Report the fact that its type changed as well. */ |
| 1605 | varobj_delete (v, 1 /* only_children */); |
| 1606 | v->num_children = -1; |
| 1607 | v->to = -1; |
| 1608 | v->from = -1; |
| 1609 | v->type = new_type; |
| 1610 | r.type_changed = true; |
| 1611 | } |
| 1612 | |
| 1613 | if (install_new_value (v, newobj, r.type_changed)) |
| 1614 | { |
| 1615 | r.changed = true; |
| 1616 | v->updated = false; |
| 1617 | } |
| 1618 | } |
| 1619 | |
| 1620 | /* We probably should not get children of a dynamic varobj, but |
| 1621 | for which -var-list-children was never invoked. */ |
| 1622 | if (varobj_is_dynamic_p (v)) |
| 1623 | { |
| 1624 | std::vector<varobj *> changed, type_changed_vec, unchanged, newobj_vec; |
| 1625 | bool children_changed = false; |
| 1626 | |
| 1627 | if (v->frozen) |
| 1628 | continue; |
| 1629 | |
| 1630 | if (!v->dynamic->children_requested) |
| 1631 | { |
| 1632 | bool dummy; |
| 1633 | |
| 1634 | /* If we initially did not have potential children, but |
| 1635 | now we do, consider the varobj as changed. |
| 1636 | Otherwise, if children were never requested, consider |
| 1637 | it as unchanged -- presumably, such varobj is not yet |
| 1638 | expanded in the UI, so we need not bother getting |
| 1639 | it. */ |
| 1640 | if (!varobj_has_more (v, 0)) |
| 1641 | { |
| 1642 | update_dynamic_varobj_children (v, NULL, NULL, NULL, NULL, |
| 1643 | &dummy, false, 0, 0); |
| 1644 | if (varobj_has_more (v, 0)) |
| 1645 | r.changed = true; |
| 1646 | } |
| 1647 | |
| 1648 | if (r.changed) |
| 1649 | result.push_back (std::move (r)); |
| 1650 | |
| 1651 | continue; |
| 1652 | } |
| 1653 | |
| 1654 | /* If update_dynamic_varobj_children returns false, then we have |
| 1655 | a non-conforming pretty-printer, so we skip it. */ |
| 1656 | if (update_dynamic_varobj_children (v, &changed, &type_changed_vec, |
| 1657 | &newobj_vec, |
| 1658 | &unchanged, &children_changed, |
| 1659 | true, v->from, v->to)) |
| 1660 | { |
| 1661 | if (children_changed || !newobj_vec.empty ()) |
| 1662 | { |
| 1663 | r.children_changed = true; |
| 1664 | r.newobj = std::move (newobj_vec); |
| 1665 | } |
| 1666 | /* Push in reverse order so that the first child is |
| 1667 | popped from the work stack first, and so will be |
| 1668 | added to result first. This does not affect |
| 1669 | correctness, just "nicer". */ |
| 1670 | for (int i = type_changed_vec.size () - 1; i >= 0; --i) |
| 1671 | { |
| 1672 | varobj_update_result item (type_changed_vec[i]); |
| 1673 | |
| 1674 | /* Type may change only if value was changed. */ |
| 1675 | item.changed = true; |
| 1676 | item.type_changed = true; |
| 1677 | item.value_installed = true; |
| 1678 | |
| 1679 | stack.push_back (std::move (item)); |
| 1680 | } |
| 1681 | for (int i = changed.size () - 1; i >= 0; --i) |
| 1682 | { |
| 1683 | varobj_update_result item (changed[i]); |
| 1684 | |
| 1685 | item.changed = true; |
| 1686 | item.value_installed = true; |
| 1687 | |
| 1688 | stack.push_back (std::move (item)); |
| 1689 | } |
| 1690 | for (int i = unchanged.size () - 1; i >= 0; --i) |
| 1691 | { |
| 1692 | if (!unchanged[i]->frozen) |
| 1693 | { |
| 1694 | varobj_update_result item (unchanged[i]); |
| 1695 | |
| 1696 | item.value_installed = true; |
| 1697 | |
| 1698 | stack.push_back (std::move (item)); |
| 1699 | } |
| 1700 | } |
| 1701 | if (r.changed || r.children_changed) |
| 1702 | result.push_back (std::move (r)); |
| 1703 | |
| 1704 | continue; |
| 1705 | } |
| 1706 | } |
| 1707 | |
| 1708 | /* Push any children. Use reverse order so that the first |
| 1709 | child is popped from the work stack first, and so |
| 1710 | will be added to result first. This does not |
| 1711 | affect correctness, just "nicer". */ |
| 1712 | for (int i = v->children.size () - 1; i >= 0; --i) |
| 1713 | { |
| 1714 | varobj *c = v->children[i]; |
| 1715 | |
| 1716 | /* Child may be NULL if explicitly deleted by -var-delete. */ |
| 1717 | if (c != NULL && !c->frozen) |
| 1718 | stack.emplace_back (c); |
| 1719 | } |
| 1720 | |
| 1721 | if (r.changed || r.type_changed) |
| 1722 | result.push_back (std::move (r)); |
| 1723 | } |
| 1724 | |
| 1725 | return result; |
| 1726 | } |
| 1727 | |
| 1728 | /* Helper functions */ |
| 1729 | |
| 1730 | /* |
| 1731 | * Variable object construction/destruction |
| 1732 | */ |
| 1733 | |
| 1734 | static int |
| 1735 | delete_variable (struct varobj *var, bool only_children_p) |
| 1736 | { |
| 1737 | int delcount = 0; |
| 1738 | |
| 1739 | delete_variable_1 (&delcount, var, only_children_p, |
| 1740 | true /* remove_from_parent_p */ ); |
| 1741 | |
| 1742 | return delcount; |
| 1743 | } |
| 1744 | |
| 1745 | /* Delete the variable object VAR and its children. */ |
| 1746 | /* IMPORTANT NOTE: If we delete a variable which is a child |
| 1747 | and the parent is not removed we dump core. It must be always |
| 1748 | initially called with remove_from_parent_p set. */ |
| 1749 | static void |
| 1750 | delete_variable_1 (int *delcountp, struct varobj *var, bool only_children_p, |
| 1751 | bool remove_from_parent_p) |
| 1752 | { |
| 1753 | /* Delete any children of this variable, too. */ |
| 1754 | for (varobj *child : var->children) |
| 1755 | { |
| 1756 | if (!child) |
| 1757 | continue; |
| 1758 | |
| 1759 | if (!remove_from_parent_p) |
| 1760 | child->parent = NULL; |
| 1761 | |
| 1762 | delete_variable_1 (delcountp, child, false, only_children_p); |
| 1763 | } |
| 1764 | var->children.clear (); |
| 1765 | |
| 1766 | /* if we were called to delete only the children we are done here. */ |
| 1767 | if (only_children_p) |
| 1768 | return; |
| 1769 | |
| 1770 | /* Otherwise, add it to the list of deleted ones and proceed to do so. */ |
| 1771 | /* If the name is empty, this is a temporary variable, that has not |
| 1772 | yet been installed, don't report it, it belongs to the caller... */ |
| 1773 | if (!var->obj_name.empty ()) |
| 1774 | { |
| 1775 | *delcountp = *delcountp + 1; |
| 1776 | } |
| 1777 | |
| 1778 | /* If this variable has a parent, remove it from its parent's list. */ |
| 1779 | /* OPTIMIZATION: if the parent of this variable is also being deleted, |
| 1780 | (as indicated by remove_from_parent_p) we don't bother doing an |
| 1781 | expensive list search to find the element to remove when we are |
| 1782 | discarding the list afterwards. */ |
| 1783 | if ((remove_from_parent_p) && (var->parent != NULL)) |
| 1784 | var->parent->children[var->index] = NULL; |
| 1785 | |
| 1786 | if (!var->obj_name.empty ()) |
| 1787 | uninstall_variable (var); |
| 1788 | |
| 1789 | /* Free memory associated with this variable. */ |
| 1790 | delete var; |
| 1791 | } |
| 1792 | |
| 1793 | /* Install the given variable VAR with the object name VAR->OBJ_NAME. */ |
| 1794 | static bool |
| 1795 | install_variable (struct varobj *var) |
| 1796 | { |
| 1797 | struct vlist *cv; |
| 1798 | struct vlist *newvl; |
| 1799 | const char *chp; |
| 1800 | unsigned int index = 0; |
| 1801 | unsigned int i = 1; |
| 1802 | |
| 1803 | for (chp = var->obj_name.c_str (); *chp; chp++) |
| 1804 | { |
| 1805 | index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; |
| 1806 | } |
| 1807 | |
| 1808 | cv = *(varobj_table + index); |
| 1809 | while (cv != NULL && cv->var->obj_name != var->obj_name) |
| 1810 | cv = cv->next; |
| 1811 | |
| 1812 | if (cv != NULL) |
| 1813 | error (_("Duplicate variable object name")); |
| 1814 | |
| 1815 | /* Add varobj to hash table. */ |
| 1816 | newvl = XNEW (struct vlist); |
| 1817 | newvl->next = *(varobj_table + index); |
| 1818 | newvl->var = var; |
| 1819 | *(varobj_table + index) = newvl; |
| 1820 | |
| 1821 | /* If root, add varobj to root list. */ |
| 1822 | if (is_root_p (var)) |
| 1823 | { |
| 1824 | /* Add to list of root variables. */ |
| 1825 | if (rootlist == NULL) |
| 1826 | var->root->next = NULL; |
| 1827 | else |
| 1828 | var->root->next = rootlist; |
| 1829 | rootlist = var->root; |
| 1830 | } |
| 1831 | |
| 1832 | return true; /* OK */ |
| 1833 | } |
| 1834 | |
| 1835 | /* Unistall the object VAR. */ |
| 1836 | static void |
| 1837 | uninstall_variable (struct varobj *var) |
| 1838 | { |
| 1839 | struct vlist *cv; |
| 1840 | struct vlist *prev; |
| 1841 | struct varobj_root *cr; |
| 1842 | struct varobj_root *prer; |
| 1843 | const char *chp; |
| 1844 | unsigned int index = 0; |
| 1845 | unsigned int i = 1; |
| 1846 | |
| 1847 | /* Remove varobj from hash table. */ |
| 1848 | for (chp = var->obj_name.c_str (); *chp; chp++) |
| 1849 | { |
| 1850 | index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; |
| 1851 | } |
| 1852 | |
| 1853 | cv = *(varobj_table + index); |
| 1854 | prev = NULL; |
| 1855 | while (cv != NULL && cv->var->obj_name != var->obj_name) |
| 1856 | { |
| 1857 | prev = cv; |
| 1858 | cv = cv->next; |
| 1859 | } |
| 1860 | |
| 1861 | if (varobjdebug) |
| 1862 | fprintf_unfiltered (gdb_stdlog, "Deleting %s\n", var->obj_name.c_str ()); |
| 1863 | |
| 1864 | if (cv == NULL) |
| 1865 | { |
| 1866 | warning |
| 1867 | ("Assertion failed: Could not find variable object \"%s\" to delete", |
| 1868 | var->obj_name.c_str ()); |
| 1869 | return; |
| 1870 | } |
| 1871 | |
| 1872 | if (prev == NULL) |
| 1873 | *(varobj_table + index) = cv->next; |
| 1874 | else |
| 1875 | prev->next = cv->next; |
| 1876 | |
| 1877 | xfree (cv); |
| 1878 | |
| 1879 | /* If root, remove varobj from root list. */ |
| 1880 | if (is_root_p (var)) |
| 1881 | { |
| 1882 | /* Remove from list of root variables. */ |
| 1883 | if (rootlist == var->root) |
| 1884 | rootlist = var->root->next; |
| 1885 | else |
| 1886 | { |
| 1887 | prer = NULL; |
| 1888 | cr = rootlist; |
| 1889 | while ((cr != NULL) && (cr->rootvar != var)) |
| 1890 | { |
| 1891 | prer = cr; |
| 1892 | cr = cr->next; |
| 1893 | } |
| 1894 | if (cr == NULL) |
| 1895 | { |
| 1896 | warning (_("Assertion failed: Could not find " |
| 1897 | "varobj \"%s\" in root list"), |
| 1898 | var->obj_name.c_str ()); |
| 1899 | return; |
| 1900 | } |
| 1901 | if (prer == NULL) |
| 1902 | rootlist = NULL; |
| 1903 | else |
| 1904 | prer->next = cr->next; |
| 1905 | } |
| 1906 | } |
| 1907 | |
| 1908 | } |
| 1909 | |
| 1910 | /* Create and install a child of the parent of the given name. |
| 1911 | |
| 1912 | The created VAROBJ takes ownership of the allocated NAME. */ |
| 1913 | |
| 1914 | static struct varobj * |
| 1915 | create_child (struct varobj *parent, int index, std::string &name) |
| 1916 | { |
| 1917 | struct varobj_item item; |
| 1918 | |
| 1919 | std::swap (item.name, name); |
| 1920 | item.value = value_of_child (parent, index); |
| 1921 | |
| 1922 | return create_child_with_value (parent, index, &item); |
| 1923 | } |
| 1924 | |
| 1925 | static struct varobj * |
| 1926 | create_child_with_value (struct varobj *parent, int index, |
| 1927 | struct varobj_item *item) |
| 1928 | { |
| 1929 | varobj *child = new varobj (parent->root); |
| 1930 | |
| 1931 | /* NAME is allocated by caller. */ |
| 1932 | std::swap (child->name, item->name); |
| 1933 | child->index = index; |
| 1934 | child->parent = parent; |
| 1935 | |
| 1936 | if (varobj_is_anonymous_child (child)) |
| 1937 | child->obj_name = string_printf ("%s.%d_anonymous", |
| 1938 | parent->obj_name.c_str (), index); |
| 1939 | else |
| 1940 | child->obj_name = string_printf ("%s.%s", |
| 1941 | parent->obj_name.c_str (), |
| 1942 | child->name.c_str ()); |
| 1943 | |
| 1944 | install_variable (child); |
| 1945 | |
| 1946 | /* Compute the type of the child. Must do this before |
| 1947 | calling install_new_value. */ |
| 1948 | if (item->value != NULL) |
| 1949 | /* If the child had no evaluation errors, var->value |
| 1950 | will be non-NULL and contain a valid type. */ |
| 1951 | child->type = value_actual_type (item->value, 0, NULL); |
| 1952 | else |
| 1953 | /* Otherwise, we must compute the type. */ |
| 1954 | child->type = (*child->root->lang_ops->type_of_child) (child->parent, |
| 1955 | child->index); |
| 1956 | install_new_value (child, item->value, 1); |
| 1957 | |
| 1958 | return child; |
| 1959 | } |
| 1960 | \f |
| 1961 | |
| 1962 | /* |
| 1963 | * Miscellaneous utility functions. |
| 1964 | */ |
| 1965 | |
| 1966 | /* Allocate memory and initialize a new variable. */ |
| 1967 | varobj::varobj (varobj_root *root_) |
| 1968 | : root (root_), dynamic (new varobj_dynamic) |
| 1969 | { |
| 1970 | } |
| 1971 | |
| 1972 | /* Free any allocated memory associated with VAR. */ |
| 1973 | |
| 1974 | varobj::~varobj () |
| 1975 | { |
| 1976 | varobj *var = this; |
| 1977 | |
| 1978 | #if HAVE_PYTHON |
| 1979 | if (var->dynamic->pretty_printer != NULL) |
| 1980 | { |
| 1981 | gdbpy_enter_varobj enter_py (var); |
| 1982 | |
| 1983 | Py_XDECREF (var->dynamic->constructor); |
| 1984 | Py_XDECREF (var->dynamic->pretty_printer); |
| 1985 | } |
| 1986 | #endif |
| 1987 | |
| 1988 | varobj_iter_delete (var->dynamic->child_iter); |
| 1989 | varobj_clear_saved_item (var->dynamic); |
| 1990 | |
| 1991 | if (is_root_p (var)) |
| 1992 | delete var->root; |
| 1993 | |
| 1994 | delete var->dynamic; |
| 1995 | } |
| 1996 | |
| 1997 | /* Return the type of the value that's stored in VAR, |
| 1998 | or that would have being stored there if the |
| 1999 | value were accessible. |
| 2000 | |
| 2001 | This differs from VAR->type in that VAR->type is always |
| 2002 | the true type of the expession in the source language. |
| 2003 | The return value of this function is the type we're |
| 2004 | actually storing in varobj, and using for displaying |
| 2005 | the values and for comparing previous and new values. |
| 2006 | |
| 2007 | For example, top-level references are always stripped. */ |
| 2008 | struct type * |
| 2009 | varobj_get_value_type (const struct varobj *var) |
| 2010 | { |
| 2011 | struct type *type; |
| 2012 | |
| 2013 | if (var->value != nullptr) |
| 2014 | type = value_type (var->value.get ()); |
| 2015 | else |
| 2016 | type = var->type; |
| 2017 | |
| 2018 | type = check_typedef (type); |
| 2019 | |
| 2020 | if (TYPE_IS_REFERENCE (type)) |
| 2021 | type = get_target_type (type); |
| 2022 | |
| 2023 | type = check_typedef (type); |
| 2024 | |
| 2025 | return type; |
| 2026 | } |
| 2027 | |
| 2028 | /* What is the default display for this variable? We assume that |
| 2029 | everything is "natural". Any exceptions? */ |
| 2030 | static enum varobj_display_formats |
| 2031 | variable_default_display (struct varobj *var) |
| 2032 | { |
| 2033 | return FORMAT_NATURAL; |
| 2034 | } |
| 2035 | |
| 2036 | /* |
| 2037 | * Language-dependencies |
| 2038 | */ |
| 2039 | |
| 2040 | /* Common entry points */ |
| 2041 | |
| 2042 | /* Return the number of children for a given variable. |
| 2043 | The result of this function is defined by the language |
| 2044 | implementation. The number of children returned by this function |
| 2045 | is the number of children that the user will see in the variable |
| 2046 | display. */ |
| 2047 | static int |
| 2048 | number_of_children (const struct varobj *var) |
| 2049 | { |
| 2050 | return (*var->root->lang_ops->number_of_children) (var); |
| 2051 | } |
| 2052 | |
| 2053 | /* What is the expression for the root varobj VAR? */ |
| 2054 | |
| 2055 | static std::string |
| 2056 | name_of_variable (const struct varobj *var) |
| 2057 | { |
| 2058 | return (*var->root->lang_ops->name_of_variable) (var); |
| 2059 | } |
| 2060 | |
| 2061 | /* What is the name of the INDEX'th child of VAR? */ |
| 2062 | |
| 2063 | static std::string |
| 2064 | name_of_child (struct varobj *var, int index) |
| 2065 | { |
| 2066 | return (*var->root->lang_ops->name_of_child) (var, index); |
| 2067 | } |
| 2068 | |
| 2069 | /* If frame associated with VAR can be found, switch |
| 2070 | to it and return true. Otherwise, return false. */ |
| 2071 | |
| 2072 | static bool |
| 2073 | check_scope (const struct varobj *var) |
| 2074 | { |
| 2075 | struct frame_info *fi; |
| 2076 | bool scope; |
| 2077 | |
| 2078 | fi = frame_find_by_id (var->root->frame); |
| 2079 | scope = fi != NULL; |
| 2080 | |
| 2081 | if (fi) |
| 2082 | { |
| 2083 | CORE_ADDR pc = get_frame_pc (fi); |
| 2084 | |
| 2085 | if (pc < BLOCK_START (var->root->valid_block) || |
| 2086 | pc >= BLOCK_END (var->root->valid_block)) |
| 2087 | scope = false; |
| 2088 | else |
| 2089 | select_frame (fi); |
| 2090 | } |
| 2091 | return scope; |
| 2092 | } |
| 2093 | |
| 2094 | /* Helper function to value_of_root. */ |
| 2095 | |
| 2096 | static struct value * |
| 2097 | value_of_root_1 (struct varobj **var_handle) |
| 2098 | { |
| 2099 | struct value *new_val = NULL; |
| 2100 | struct varobj *var = *var_handle; |
| 2101 | bool within_scope = false; |
| 2102 | |
| 2103 | /* Only root variables can be updated... */ |
| 2104 | if (!is_root_p (var)) |
| 2105 | /* Not a root var. */ |
| 2106 | return NULL; |
| 2107 | |
| 2108 | scoped_restore_current_thread restore_thread; |
| 2109 | |
| 2110 | /* Determine whether the variable is still around. */ |
| 2111 | if (var->root->valid_block == NULL || var->root->floating) |
| 2112 | within_scope = true; |
| 2113 | else if (var->root->thread_id == 0) |
| 2114 | { |
| 2115 | /* The program was single-threaded when the variable object was |
| 2116 | created. Technically, it's possible that the program became |
| 2117 | multi-threaded since then, but we don't support such |
| 2118 | scenario yet. */ |
| 2119 | within_scope = check_scope (var); |
| 2120 | } |
| 2121 | else |
| 2122 | { |
| 2123 | thread_info *thread = find_thread_global_id (var->root->thread_id); |
| 2124 | |
| 2125 | if (thread != NULL) |
| 2126 | { |
| 2127 | switch_to_thread (thread); |
| 2128 | within_scope = check_scope (var); |
| 2129 | } |
| 2130 | } |
| 2131 | |
| 2132 | if (within_scope) |
| 2133 | { |
| 2134 | |
| 2135 | /* We need to catch errors here, because if evaluate |
| 2136 | expression fails we want to just return NULL. */ |
| 2137 | try |
| 2138 | { |
| 2139 | new_val = evaluate_expression (var->root->exp.get ()); |
| 2140 | } |
| 2141 | catch (const gdb_exception_error &except) |
| 2142 | { |
| 2143 | } |
| 2144 | } |
| 2145 | |
| 2146 | return new_val; |
| 2147 | } |
| 2148 | |
| 2149 | /* What is the ``struct value *'' of the root variable VAR? |
| 2150 | For floating variable object, evaluation can get us a value |
| 2151 | of different type from what is stored in varobj already. In |
| 2152 | that case: |
| 2153 | - *type_changed will be set to 1 |
| 2154 | - old varobj will be freed, and new one will be |
| 2155 | created, with the same name. |
| 2156 | - *var_handle will be set to the new varobj |
| 2157 | Otherwise, *type_changed will be set to 0. */ |
| 2158 | static struct value * |
| 2159 | value_of_root (struct varobj **var_handle, bool *type_changed) |
| 2160 | { |
| 2161 | struct varobj *var; |
| 2162 | |
| 2163 | if (var_handle == NULL) |
| 2164 | return NULL; |
| 2165 | |
| 2166 | var = *var_handle; |
| 2167 | |
| 2168 | /* This should really be an exception, since this should |
| 2169 | only get called with a root variable. */ |
| 2170 | |
| 2171 | if (!is_root_p (var)) |
| 2172 | return NULL; |
| 2173 | |
| 2174 | if (var->root->floating) |
| 2175 | { |
| 2176 | struct varobj *tmp_var; |
| 2177 | |
| 2178 | tmp_var = varobj_create (NULL, var->name.c_str (), (CORE_ADDR) 0, |
| 2179 | USE_SELECTED_FRAME); |
| 2180 | if (tmp_var == NULL) |
| 2181 | { |
| 2182 | return NULL; |
| 2183 | } |
| 2184 | std::string old_type = varobj_get_type (var); |
| 2185 | std::string new_type = varobj_get_type (tmp_var); |
| 2186 | if (old_type == new_type) |
| 2187 | { |
| 2188 | /* The expression presently stored inside var->root->exp |
| 2189 | remembers the locations of local variables relatively to |
| 2190 | the frame where the expression was created (in DWARF location |
| 2191 | button, for example). Naturally, those locations are not |
| 2192 | correct in other frames, so update the expression. */ |
| 2193 | |
| 2194 | std::swap (var->root->exp, tmp_var->root->exp); |
| 2195 | |
| 2196 | varobj_delete (tmp_var, 0); |
| 2197 | *type_changed = 0; |
| 2198 | } |
| 2199 | else |
| 2200 | { |
| 2201 | tmp_var->obj_name = var->obj_name; |
| 2202 | tmp_var->from = var->from; |
| 2203 | tmp_var->to = var->to; |
| 2204 | varobj_delete (var, 0); |
| 2205 | |
| 2206 | install_variable (tmp_var); |
| 2207 | *var_handle = tmp_var; |
| 2208 | var = *var_handle; |
| 2209 | *type_changed = true; |
| 2210 | } |
| 2211 | } |
| 2212 | else |
| 2213 | { |
| 2214 | *type_changed = 0; |
| 2215 | } |
| 2216 | |
| 2217 | { |
| 2218 | struct value *value; |
| 2219 | |
| 2220 | value = value_of_root_1 (var_handle); |
| 2221 | if (var->value == NULL || value == NULL) |
| 2222 | { |
| 2223 | /* For root varobj-s, a NULL value indicates a scoping issue. |
| 2224 | So, nothing to do in terms of checking for mutations. */ |
| 2225 | } |
| 2226 | else if (varobj_value_has_mutated (var, value, value_type (value))) |
| 2227 | { |
| 2228 | /* The type has mutated, so the children are no longer valid. |
| 2229 | Just delete them, and tell our caller that the type has |
| 2230 | changed. */ |
| 2231 | varobj_delete (var, 1 /* only_children */); |
| 2232 | var->num_children = -1; |
| 2233 | var->to = -1; |
| 2234 | var->from = -1; |
| 2235 | *type_changed = true; |
| 2236 | } |
| 2237 | return value; |
| 2238 | } |
| 2239 | } |
| 2240 | |
| 2241 | /* What is the ``struct value *'' for the INDEX'th child of PARENT? */ |
| 2242 | static struct value * |
| 2243 | value_of_child (const struct varobj *parent, int index) |
| 2244 | { |
| 2245 | struct value *value; |
| 2246 | |
| 2247 | value = (*parent->root->lang_ops->value_of_child) (parent, index); |
| 2248 | |
| 2249 | return value; |
| 2250 | } |
| 2251 | |
| 2252 | /* GDB already has a command called "value_of_variable". Sigh. */ |
| 2253 | static std::string |
| 2254 | my_value_of_variable (struct varobj *var, enum varobj_display_formats format) |
| 2255 | { |
| 2256 | if (var->root->is_valid) |
| 2257 | { |
| 2258 | if (var->dynamic->pretty_printer != NULL) |
| 2259 | return varobj_value_get_print_value (var->value.get (), var->format, |
| 2260 | var); |
| 2261 | return (*var->root->lang_ops->value_of_variable) (var, format); |
| 2262 | } |
| 2263 | else |
| 2264 | return std::string (); |
| 2265 | } |
| 2266 | |
| 2267 | void |
| 2268 | varobj_formatted_print_options (struct value_print_options *opts, |
| 2269 | enum varobj_display_formats format) |
| 2270 | { |
| 2271 | get_formatted_print_options (opts, format_code[(int) format]); |
| 2272 | opts->deref_ref = 0; |
| 2273 | opts->raw = !pretty_printing; |
| 2274 | } |
| 2275 | |
| 2276 | std::string |
| 2277 | varobj_value_get_print_value (struct value *value, |
| 2278 | enum varobj_display_formats format, |
| 2279 | const struct varobj *var) |
| 2280 | { |
| 2281 | struct value_print_options opts; |
| 2282 | struct type *type = NULL; |
| 2283 | long len = 0; |
| 2284 | gdb::unique_xmalloc_ptr<char> encoding; |
| 2285 | /* Initialize it just to avoid a GCC false warning. */ |
| 2286 | CORE_ADDR str_addr = 0; |
| 2287 | bool string_print = false; |
| 2288 | |
| 2289 | if (value == NULL) |
| 2290 | return std::string (); |
| 2291 | |
| 2292 | string_file stb; |
| 2293 | std::string thevalue; |
| 2294 | |
| 2295 | #if HAVE_PYTHON |
| 2296 | if (gdb_python_initialized) |
| 2297 | { |
| 2298 | PyObject *value_formatter = var->dynamic->pretty_printer; |
| 2299 | |
| 2300 | gdbpy_enter_varobj enter_py (var); |
| 2301 | |
| 2302 | if (value_formatter) |
| 2303 | { |
| 2304 | /* First check to see if we have any children at all. If so, |
| 2305 | we simply return {...}. */ |
| 2306 | if (dynamic_varobj_has_child_method (var)) |
| 2307 | return "{...}"; |
| 2308 | |
| 2309 | if (PyObject_HasAttr (value_formatter, gdbpy_to_string_cst)) |
| 2310 | { |
| 2311 | struct value *replacement; |
| 2312 | |
| 2313 | gdbpy_ref<> output = apply_varobj_pretty_printer (value_formatter, |
| 2314 | &replacement, |
| 2315 | &stb); |
| 2316 | |
| 2317 | /* If we have string like output ... */ |
| 2318 | if (output != NULL) |
| 2319 | { |
| 2320 | /* If this is a lazy string, extract it. For lazy |
| 2321 | strings we always print as a string, so set |
| 2322 | string_print. */ |
| 2323 | if (gdbpy_is_lazy_string (output.get ())) |
| 2324 | { |
| 2325 | gdbpy_extract_lazy_string (output.get (), &str_addr, |
| 2326 | &type, &len, &encoding); |
| 2327 | string_print = true; |
| 2328 | } |
| 2329 | else |
| 2330 | { |
| 2331 | /* If it is a regular (non-lazy) string, extract |
| 2332 | it and copy the contents into THEVALUE. If the |
| 2333 | hint says to print it as a string, set |
| 2334 | string_print. Otherwise just return the extracted |
| 2335 | string as a value. */ |
| 2336 | |
| 2337 | gdb::unique_xmalloc_ptr<char> s |
| 2338 | = python_string_to_target_string (output.get ()); |
| 2339 | |
| 2340 | if (s) |
| 2341 | { |
| 2342 | struct gdbarch *gdbarch; |
| 2343 | |
| 2344 | gdb::unique_xmalloc_ptr<char> hint |
| 2345 | = gdbpy_get_display_hint (value_formatter); |
| 2346 | if (hint) |
| 2347 | { |
| 2348 | if (!strcmp (hint.get (), "string")) |
| 2349 | string_print = true; |
| 2350 | } |
| 2351 | |
| 2352 | thevalue = std::string (s.get ()); |
| 2353 | len = thevalue.size (); |
| 2354 | gdbarch = get_type_arch (value_type (value)); |
| 2355 | type = builtin_type (gdbarch)->builtin_char; |
| 2356 | |
| 2357 | if (!string_print) |
| 2358 | return thevalue; |
| 2359 | } |
| 2360 | else |
| 2361 | gdbpy_print_stack (); |
| 2362 | } |
| 2363 | } |
| 2364 | /* If the printer returned a replacement value, set VALUE |
| 2365 | to REPLACEMENT. If there is not a replacement value, |
| 2366 | just use the value passed to this function. */ |
| 2367 | if (replacement) |
| 2368 | value = replacement; |
| 2369 | } |
| 2370 | } |
| 2371 | } |
| 2372 | #endif |
| 2373 | |
| 2374 | varobj_formatted_print_options (&opts, format); |
| 2375 | |
| 2376 | /* If the THEVALUE has contents, it is a regular string. */ |
| 2377 | if (!thevalue.empty ()) |
| 2378 | LA_PRINT_STRING (&stb, type, (gdb_byte *) thevalue.c_str (), |
| 2379 | len, encoding.get (), 0, &opts); |
| 2380 | else if (string_print) |
| 2381 | /* Otherwise, if string_print is set, and it is not a regular |
| 2382 | string, it is a lazy string. */ |
| 2383 | val_print_string (type, encoding.get (), str_addr, len, &stb, &opts); |
| 2384 | else |
| 2385 | /* All other cases. */ |
| 2386 | common_val_print (value, &stb, 0, &opts, current_language); |
| 2387 | |
| 2388 | return std::move (stb.string ()); |
| 2389 | } |
| 2390 | |
| 2391 | bool |
| 2392 | varobj_editable_p (const struct varobj *var) |
| 2393 | { |
| 2394 | struct type *type; |
| 2395 | |
| 2396 | if (!(var->root->is_valid && var->value != nullptr |
| 2397 | && VALUE_LVAL (var->value.get ()))) |
| 2398 | return false; |
| 2399 | |
| 2400 | type = varobj_get_value_type (var); |
| 2401 | |
| 2402 | switch (TYPE_CODE (type)) |
| 2403 | { |
| 2404 | case TYPE_CODE_STRUCT: |
| 2405 | case TYPE_CODE_UNION: |
| 2406 | case TYPE_CODE_ARRAY: |
| 2407 | case TYPE_CODE_FUNC: |
| 2408 | case TYPE_CODE_METHOD: |
| 2409 | return false; |
| 2410 | break; |
| 2411 | |
| 2412 | default: |
| 2413 | return true; |
| 2414 | break; |
| 2415 | } |
| 2416 | } |
| 2417 | |
| 2418 | /* Call VAR's value_is_changeable_p language-specific callback. */ |
| 2419 | |
| 2420 | bool |
| 2421 | varobj_value_is_changeable_p (const struct varobj *var) |
| 2422 | { |
| 2423 | return var->root->lang_ops->value_is_changeable_p (var); |
| 2424 | } |
| 2425 | |
| 2426 | /* Return true if that varobj is floating, that is is always evaluated in the |
| 2427 | selected frame, and not bound to thread/frame. Such variable objects |
| 2428 | are created using '@' as frame specifier to -var-create. */ |
| 2429 | bool |
| 2430 | varobj_floating_p (const struct varobj *var) |
| 2431 | { |
| 2432 | return var->root->floating; |
| 2433 | } |
| 2434 | |
| 2435 | /* Implement the "value_is_changeable_p" varobj callback for most |
| 2436 | languages. */ |
| 2437 | |
| 2438 | bool |
| 2439 | varobj_default_value_is_changeable_p (const struct varobj *var) |
| 2440 | { |
| 2441 | bool r; |
| 2442 | struct type *type; |
| 2443 | |
| 2444 | if (CPLUS_FAKE_CHILD (var)) |
| 2445 | return false; |
| 2446 | |
| 2447 | type = varobj_get_value_type (var); |
| 2448 | |
| 2449 | switch (TYPE_CODE (type)) |
| 2450 | { |
| 2451 | case TYPE_CODE_STRUCT: |
| 2452 | case TYPE_CODE_UNION: |
| 2453 | case TYPE_CODE_ARRAY: |
| 2454 | r = false; |
| 2455 | break; |
| 2456 | |
| 2457 | default: |
| 2458 | r = true; |
| 2459 | } |
| 2460 | |
| 2461 | return r; |
| 2462 | } |
| 2463 | |
| 2464 | /* Iterate all the existing _root_ VAROBJs and call the FUNC callback for them |
| 2465 | with an arbitrary caller supplied DATA pointer. */ |
| 2466 | |
| 2467 | void |
| 2468 | all_root_varobjs (void (*func) (struct varobj *var, void *data), void *data) |
| 2469 | { |
| 2470 | struct varobj_root *var_root, *var_root_next; |
| 2471 | |
| 2472 | /* Iterate "safely" - handle if the callee deletes its passed VAROBJ. */ |
| 2473 | |
| 2474 | for (var_root = rootlist; var_root != NULL; var_root = var_root_next) |
| 2475 | { |
| 2476 | var_root_next = var_root->next; |
| 2477 | |
| 2478 | (*func) (var_root->rootvar, data); |
| 2479 | } |
| 2480 | } |
| 2481 | |
| 2482 | /* Invalidate varobj VAR if it is tied to locals and re-create it if it is |
| 2483 | defined on globals. It is a helper for varobj_invalidate. |
| 2484 | |
| 2485 | This function is called after changing the symbol file, in this case the |
| 2486 | pointers to "struct type" stored by the varobj are no longer valid. All |
| 2487 | varobj must be either re-evaluated, or marked as invalid here. */ |
| 2488 | |
| 2489 | static void |
| 2490 | varobj_invalidate_iter (struct varobj *var, void *unused) |
| 2491 | { |
| 2492 | /* global and floating var must be re-evaluated. */ |
| 2493 | if (var->root->floating || var->root->valid_block == NULL) |
| 2494 | { |
| 2495 | struct varobj *tmp_var; |
| 2496 | |
| 2497 | /* Try to create a varobj with same expression. If we succeed |
| 2498 | replace the old varobj, otherwise invalidate it. */ |
| 2499 | tmp_var = varobj_create (NULL, var->name.c_str (), (CORE_ADDR) 0, |
| 2500 | USE_CURRENT_FRAME); |
| 2501 | if (tmp_var != NULL) |
| 2502 | { |
| 2503 | tmp_var->obj_name = var->obj_name; |
| 2504 | varobj_delete (var, 0); |
| 2505 | install_variable (tmp_var); |
| 2506 | } |
| 2507 | else |
| 2508 | var->root->is_valid = false; |
| 2509 | } |
| 2510 | else /* locals must be invalidated. */ |
| 2511 | var->root->is_valid = false; |
| 2512 | } |
| 2513 | |
| 2514 | /* Invalidate the varobjs that are tied to locals and re-create the ones that |
| 2515 | are defined on globals. |
| 2516 | Invalidated varobjs will be always printed in_scope="invalid". */ |
| 2517 | |
| 2518 | void |
| 2519 | varobj_invalidate (void) |
| 2520 | { |
| 2521 | all_root_varobjs (varobj_invalidate_iter, NULL); |
| 2522 | } |
| 2523 | |
| 2524 | void |
| 2525 | _initialize_varobj (void) |
| 2526 | { |
| 2527 | varobj_table = XCNEWVEC (struct vlist *, VAROBJ_TABLE_SIZE); |
| 2528 | |
| 2529 | add_setshow_zuinteger_cmd ("varobj", class_maintenance, |
| 2530 | &varobjdebug, |
| 2531 | _("Set varobj debugging."), |
| 2532 | _("Show varobj debugging."), |
| 2533 | _("When non-zero, varobj debugging is enabled."), |
| 2534 | NULL, show_varobjdebug, |
| 2535 | &setdebuglist, &showdebuglist); |
| 2536 | } |