| 1 | /* Implementation of the GDB variable objects API. |
| 2 | |
| 3 | Copyright (C) 1999-2017 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 "vec.h" |
| 30 | #include "gdbthread.h" |
| 31 | #include "inferior.h" |
| 32 | #include "varobj-iter.h" |
| 33 | |
| 34 | #if HAVE_PYTHON |
| 35 | #include "python/python.h" |
| 36 | #include "python/python-internal.h" |
| 37 | #include "python/py-ref.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 | 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 int pretty_printing = 0; |
| 58 | |
| 59 | void |
| 60 | varobj_enable_pretty_printing (void) |
| 61 | { |
| 62 | pretty_printing = 1; |
| 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 | |
| 72 | /* The expression for this parent. */ |
| 73 | expression_up exp; |
| 74 | |
| 75 | /* Block for which this expression is valid. */ |
| 76 | const struct block *valid_block; |
| 77 | |
| 78 | /* The frame for this expression. This field is set iff valid_block is |
| 79 | not NULL. */ |
| 80 | struct frame_id frame; |
| 81 | |
| 82 | /* The global thread ID that this varobj_root belongs to. This field |
| 83 | is only valid if valid_block is not NULL. |
| 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. */ |
| 87 | int thread_id; |
| 88 | |
| 89 | /* If 1, the -var-update always recomputes the value in the |
| 90 | current thread and frame. Otherwise, variable object is |
| 91 | always updated in the specific scope/thread/frame. */ |
| 92 | int floating; |
| 93 | |
| 94 | /* Flag that indicates validity: set to 0 when this varobj_root refers |
| 95 | to symbols that do not exist anymore. */ |
| 96 | int is_valid; |
| 97 | |
| 98 | /* Language-related operations for this variable and its |
| 99 | children. */ |
| 100 | const struct lang_varobj_ops *lang_ops; |
| 101 | |
| 102 | /* The varobj for this root node. */ |
| 103 | struct varobj *rootvar; |
| 104 | |
| 105 | /* Next root variable */ |
| 106 | struct varobj_root *next; |
| 107 | }; |
| 108 | |
| 109 | /* Dynamic part of varobj. */ |
| 110 | |
| 111 | struct varobj_dynamic |
| 112 | { |
| 113 | /* Whether the children of this varobj were requested. This field is |
| 114 | used to decide if dynamic varobj should recompute their children. |
| 115 | In the event that the frontend never asked for the children, we |
| 116 | can avoid that. */ |
| 117 | int children_requested; |
| 118 | |
| 119 | /* The pretty-printer constructor. If NULL, then the default |
| 120 | pretty-printer will be looked up. If None, then no |
| 121 | pretty-printer will be installed. */ |
| 122 | PyObject *constructor; |
| 123 | |
| 124 | /* The pretty-printer that has been constructed. If NULL, then a |
| 125 | new printer object is needed, and one will be constructed. */ |
| 126 | PyObject *pretty_printer; |
| 127 | |
| 128 | /* The iterator returned by the printer's 'children' method, or NULL |
| 129 | if not available. */ |
| 130 | struct varobj_iter *child_iter; |
| 131 | |
| 132 | /* We request one extra item from the iterator, so that we can |
| 133 | report to the caller whether there are more items than we have |
| 134 | already reported. However, we don't want to install this value |
| 135 | when we read it, because that will mess up future updates. So, |
| 136 | we stash it here instead. */ |
| 137 | varobj_item *saved_item; |
| 138 | }; |
| 139 | |
| 140 | /* A list of varobjs */ |
| 141 | |
| 142 | struct vlist |
| 143 | { |
| 144 | struct varobj *var; |
| 145 | struct vlist *next; |
| 146 | }; |
| 147 | |
| 148 | /* Private function prototypes */ |
| 149 | |
| 150 | /* Helper functions for the above subcommands. */ |
| 151 | |
| 152 | static int delete_variable (struct varobj *, int); |
| 153 | |
| 154 | static void delete_variable_1 (int *, struct varobj *, int, int); |
| 155 | |
| 156 | static int install_variable (struct varobj *); |
| 157 | |
| 158 | static void uninstall_variable (struct varobj *); |
| 159 | |
| 160 | static struct varobj *create_child (struct varobj *, int, std::string &); |
| 161 | |
| 162 | static struct varobj * |
| 163 | create_child_with_value (struct varobj *parent, int index, |
| 164 | struct varobj_item *item); |
| 165 | |
| 166 | /* Utility routines */ |
| 167 | |
| 168 | static struct varobj *new_variable (void); |
| 169 | |
| 170 | static struct varobj *new_root_variable (void); |
| 171 | |
| 172 | static void free_variable (struct varobj *var); |
| 173 | |
| 174 | static struct cleanup *make_cleanup_free_variable (struct varobj *var); |
| 175 | |
| 176 | static enum varobj_display_formats variable_default_display (struct varobj *); |
| 177 | |
| 178 | static int update_type_if_necessary (struct varobj *var, |
| 179 | struct value *new_value); |
| 180 | |
| 181 | static int install_new_value (struct varobj *var, struct value *value, |
| 182 | int initial); |
| 183 | |
| 184 | /* Language-specific routines. */ |
| 185 | |
| 186 | static int number_of_children (const struct varobj *); |
| 187 | |
| 188 | static std::string name_of_variable (const struct varobj *); |
| 189 | |
| 190 | static std::string name_of_child (struct varobj *, int); |
| 191 | |
| 192 | static struct value *value_of_root (struct varobj **var_handle, int *); |
| 193 | |
| 194 | static struct value *value_of_child (const struct varobj *parent, int index); |
| 195 | |
| 196 | static std::string my_value_of_variable (struct varobj *var, |
| 197 | enum varobj_display_formats format); |
| 198 | |
| 199 | static int is_root_p (const struct varobj *var); |
| 200 | |
| 201 | static struct varobj *varobj_add_child (struct varobj *var, |
| 202 | struct varobj_item *item); |
| 203 | |
| 204 | /* Private data */ |
| 205 | |
| 206 | /* Mappings of varobj_display_formats enums to gdb's format codes. */ |
| 207 | static int format_code[] = { 0, 't', 'd', 'x', 'o', 'z' }; |
| 208 | |
| 209 | /* Header of the list of root variable objects. */ |
| 210 | static struct varobj_root *rootlist; |
| 211 | |
| 212 | /* Prime number indicating the number of buckets in the hash table. */ |
| 213 | /* A prime large enough to avoid too many collisions. */ |
| 214 | #define VAROBJ_TABLE_SIZE 227 |
| 215 | |
| 216 | /* Pointer to the varobj hash table (built at run time). */ |
| 217 | static struct vlist **varobj_table; |
| 218 | |
| 219 | \f |
| 220 | |
| 221 | /* API Implementation */ |
| 222 | static int |
| 223 | is_root_p (const struct varobj *var) |
| 224 | { |
| 225 | return (var->root->rootvar == var); |
| 226 | } |
| 227 | |
| 228 | #ifdef HAVE_PYTHON |
| 229 | |
| 230 | /* See python-internal.h. */ |
| 231 | gdbpy_enter_varobj::gdbpy_enter_varobj (const struct varobj *var) |
| 232 | : gdbpy_enter (var->root->exp->gdbarch, var->root->exp->language_defn) |
| 233 | { |
| 234 | } |
| 235 | |
| 236 | #endif |
| 237 | |
| 238 | /* Return the full FRAME which corresponds to the given CORE_ADDR |
| 239 | or NULL if no FRAME on the chain corresponds to CORE_ADDR. */ |
| 240 | |
| 241 | static struct frame_info * |
| 242 | find_frame_addr_in_frame_chain (CORE_ADDR frame_addr) |
| 243 | { |
| 244 | struct frame_info *frame = NULL; |
| 245 | |
| 246 | if (frame_addr == (CORE_ADDR) 0) |
| 247 | return NULL; |
| 248 | |
| 249 | for (frame = get_current_frame (); |
| 250 | frame != NULL; |
| 251 | frame = get_prev_frame (frame)) |
| 252 | { |
| 253 | /* The CORE_ADDR we get as argument was parsed from a string GDB |
| 254 | output as $fp. This output got truncated to gdbarch_addr_bit. |
| 255 | Truncate the frame base address in the same manner before |
| 256 | comparing it against our argument. */ |
| 257 | CORE_ADDR frame_base = get_frame_base_address (frame); |
| 258 | int addr_bit = gdbarch_addr_bit (get_frame_arch (frame)); |
| 259 | |
| 260 | if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)) |
| 261 | frame_base &= ((CORE_ADDR) 1 << addr_bit) - 1; |
| 262 | |
| 263 | if (frame_base == frame_addr) |
| 264 | return frame; |
| 265 | } |
| 266 | |
| 267 | return NULL; |
| 268 | } |
| 269 | |
| 270 | /* Creates a varobj (not its children). */ |
| 271 | |
| 272 | struct varobj * |
| 273 | varobj_create (const char *objname, |
| 274 | const char *expression, CORE_ADDR frame, enum varobj_type type) |
| 275 | { |
| 276 | struct varobj *var; |
| 277 | struct cleanup *old_chain; |
| 278 | |
| 279 | /* Fill out a varobj structure for the (root) variable being constructed. */ |
| 280 | var = new_root_variable (); |
| 281 | old_chain = make_cleanup_free_variable (var); |
| 282 | |
| 283 | if (expression != NULL) |
| 284 | { |
| 285 | struct frame_info *fi; |
| 286 | struct frame_id old_id = null_frame_id; |
| 287 | const struct block *block; |
| 288 | const char *p; |
| 289 | struct value *value = NULL; |
| 290 | CORE_ADDR pc; |
| 291 | |
| 292 | /* Parse and evaluate the expression, filling in as much of the |
| 293 | variable's data as possible. */ |
| 294 | |
| 295 | if (has_stack_frames ()) |
| 296 | { |
| 297 | /* Allow creator to specify context of variable. */ |
| 298 | if ((type == USE_CURRENT_FRAME) || (type == USE_SELECTED_FRAME)) |
| 299 | fi = get_selected_frame (NULL); |
| 300 | else |
| 301 | /* FIXME: cagney/2002-11-23: This code should be doing a |
| 302 | lookup using the frame ID and not just the frame's |
| 303 | ``address''. This, of course, means an interface |
| 304 | change. However, with out that interface change ISAs, |
| 305 | such as the ia64 with its two stacks, won't work. |
| 306 | Similar goes for the case where there is a frameless |
| 307 | function. */ |
| 308 | fi = find_frame_addr_in_frame_chain (frame); |
| 309 | } |
| 310 | else |
| 311 | fi = NULL; |
| 312 | |
| 313 | /* frame = -2 means always use selected frame. */ |
| 314 | if (type == USE_SELECTED_FRAME) |
| 315 | var->root->floating = 1; |
| 316 | |
| 317 | pc = 0; |
| 318 | block = NULL; |
| 319 | if (fi != NULL) |
| 320 | { |
| 321 | block = get_frame_block (fi, 0); |
| 322 | pc = get_frame_pc (fi); |
| 323 | } |
| 324 | |
| 325 | p = expression; |
| 326 | innermost_block = NULL; |
| 327 | /* Wrap the call to parse expression, so we can |
| 328 | return a sensible error. */ |
| 329 | TRY |
| 330 | { |
| 331 | var->root->exp = parse_exp_1 (&p, pc, block, 0); |
| 332 | } |
| 333 | |
| 334 | CATCH (except, RETURN_MASK_ERROR) |
| 335 | { |
| 336 | do_cleanups (old_chain); |
| 337 | return NULL; |
| 338 | } |
| 339 | END_CATCH |
| 340 | |
| 341 | /* Don't allow variables to be created for types. */ |
| 342 | if (var->root->exp->elts[0].opcode == OP_TYPE |
| 343 | || var->root->exp->elts[0].opcode == OP_TYPEOF |
| 344 | || var->root->exp->elts[0].opcode == OP_DECLTYPE) |
| 345 | { |
| 346 | do_cleanups (old_chain); |
| 347 | fprintf_unfiltered (gdb_stderr, "Attempt to use a type name" |
| 348 | " as an expression.\n"); |
| 349 | return NULL; |
| 350 | } |
| 351 | |
| 352 | var->format = variable_default_display (var); |
| 353 | var->root->valid_block = innermost_block; |
| 354 | var->name = expression; |
| 355 | /* For a root var, the name and the expr are the same. */ |
| 356 | var->path_expr = expression; |
| 357 | |
| 358 | /* When the frame is different from the current frame, |
| 359 | we must select the appropriate frame before parsing |
| 360 | the expression, otherwise the value will not be current. |
| 361 | Since select_frame is so benign, just call it for all cases. */ |
| 362 | if (innermost_block) |
| 363 | { |
| 364 | /* User could specify explicit FRAME-ADDR which was not found but |
| 365 | EXPRESSION is frame specific and we would not be able to evaluate |
| 366 | it correctly next time. With VALID_BLOCK set we must also set |
| 367 | FRAME and THREAD_ID. */ |
| 368 | if (fi == NULL) |
| 369 | error (_("Failed to find the specified frame")); |
| 370 | |
| 371 | var->root->frame = get_frame_id (fi); |
| 372 | var->root->thread_id = ptid_to_global_thread_id (inferior_ptid); |
| 373 | old_id = get_frame_id (get_selected_frame (NULL)); |
| 374 | select_frame (fi); |
| 375 | } |
| 376 | |
| 377 | /* We definitely need to catch errors here. |
| 378 | If evaluate_expression succeeds we got the value we wanted. |
| 379 | But if it fails, we still go on with a call to evaluate_type(). */ |
| 380 | TRY |
| 381 | { |
| 382 | value = evaluate_expression (var->root->exp.get ()); |
| 383 | } |
| 384 | CATCH (except, RETURN_MASK_ERROR) |
| 385 | { |
| 386 | /* Error getting the value. Try to at least get the |
| 387 | right type. */ |
| 388 | struct value *type_only_value = evaluate_type (var->root->exp.get ()); |
| 389 | |
| 390 | var->type = value_type (type_only_value); |
| 391 | } |
| 392 | END_CATCH |
| 393 | |
| 394 | if (value != NULL) |
| 395 | { |
| 396 | int real_type_found = 0; |
| 397 | |
| 398 | var->type = value_actual_type (value, 0, &real_type_found); |
| 399 | if (real_type_found) |
| 400 | value = value_cast (var->type, value); |
| 401 | } |
| 402 | |
| 403 | /* Set language info */ |
| 404 | var->root->lang_ops = var->root->exp->language_defn->la_varobj_ops; |
| 405 | |
| 406 | install_new_value (var, value, 1 /* Initial assignment */); |
| 407 | |
| 408 | /* Set ourselves as our root. */ |
| 409 | var->root->rootvar = var; |
| 410 | |
| 411 | /* Reset the selected frame. */ |
| 412 | if (frame_id_p (old_id)) |
| 413 | select_frame (frame_find_by_id (old_id)); |
| 414 | } |
| 415 | |
| 416 | /* If the variable object name is null, that means this |
| 417 | is a temporary variable, so don't install it. */ |
| 418 | |
| 419 | if ((var != NULL) && (objname != NULL)) |
| 420 | { |
| 421 | var->obj_name = objname; |
| 422 | |
| 423 | /* If a varobj name is duplicated, the install will fail so |
| 424 | we must cleanup. */ |
| 425 | if (!install_variable (var)) |
| 426 | { |
| 427 | do_cleanups (old_chain); |
| 428 | return NULL; |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | discard_cleanups (old_chain); |
| 433 | return var; |
| 434 | } |
| 435 | |
| 436 | /* Generates an unique name that can be used for a varobj. */ |
| 437 | |
| 438 | char * |
| 439 | varobj_gen_name (void) |
| 440 | { |
| 441 | static int id = 0; |
| 442 | char *obj_name; |
| 443 | |
| 444 | /* Generate a name for this object. */ |
| 445 | id++; |
| 446 | obj_name = xstrprintf ("var%d", id); |
| 447 | |
| 448 | return obj_name; |
| 449 | } |
| 450 | |
| 451 | /* Given an OBJNAME, returns the pointer to the corresponding varobj. Call |
| 452 | error if OBJNAME cannot be found. */ |
| 453 | |
| 454 | struct varobj * |
| 455 | varobj_get_handle (const char *objname) |
| 456 | { |
| 457 | struct vlist *cv; |
| 458 | const char *chp; |
| 459 | unsigned int index = 0; |
| 460 | unsigned int i = 1; |
| 461 | |
| 462 | for (chp = objname; *chp; chp++) |
| 463 | { |
| 464 | index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; |
| 465 | } |
| 466 | |
| 467 | cv = *(varobj_table + index); |
| 468 | while (cv != NULL && cv->var->obj_name != objname) |
| 469 | cv = cv->next; |
| 470 | |
| 471 | if (cv == NULL) |
| 472 | error (_("Variable object not found")); |
| 473 | |
| 474 | return cv->var; |
| 475 | } |
| 476 | |
| 477 | /* Given the handle, return the name of the object. */ |
| 478 | |
| 479 | const char * |
| 480 | varobj_get_objname (const struct varobj *var) |
| 481 | { |
| 482 | return var->obj_name.c_str (); |
| 483 | } |
| 484 | |
| 485 | /* Given the handle, return the expression represented by the |
| 486 | object. */ |
| 487 | |
| 488 | std::string |
| 489 | varobj_get_expression (const struct varobj *var) |
| 490 | { |
| 491 | return name_of_variable (var); |
| 492 | } |
| 493 | |
| 494 | /* See varobj.h. */ |
| 495 | |
| 496 | int |
| 497 | varobj_delete (struct varobj *var, int only_children) |
| 498 | { |
| 499 | return delete_variable (var, only_children); |
| 500 | } |
| 501 | |
| 502 | #if HAVE_PYTHON |
| 503 | |
| 504 | /* Convenience function for varobj_set_visualizer. Instantiate a |
| 505 | pretty-printer for a given value. */ |
| 506 | static PyObject * |
| 507 | instantiate_pretty_printer (PyObject *constructor, struct value *value) |
| 508 | { |
| 509 | PyObject *val_obj = NULL; |
| 510 | PyObject *printer; |
| 511 | |
| 512 | val_obj = value_to_value_object (value); |
| 513 | if (! val_obj) |
| 514 | return NULL; |
| 515 | |
| 516 | printer = PyObject_CallFunctionObjArgs (constructor, val_obj, NULL); |
| 517 | Py_DECREF (val_obj); |
| 518 | return printer; |
| 519 | } |
| 520 | |
| 521 | #endif |
| 522 | |
| 523 | /* Set/Get variable object display format. */ |
| 524 | |
| 525 | enum varobj_display_formats |
| 526 | varobj_set_display_format (struct varobj *var, |
| 527 | enum varobj_display_formats format) |
| 528 | { |
| 529 | switch (format) |
| 530 | { |
| 531 | case FORMAT_NATURAL: |
| 532 | case FORMAT_BINARY: |
| 533 | case FORMAT_DECIMAL: |
| 534 | case FORMAT_HEXADECIMAL: |
| 535 | case FORMAT_OCTAL: |
| 536 | case FORMAT_ZHEXADECIMAL: |
| 537 | var->format = format; |
| 538 | break; |
| 539 | |
| 540 | default: |
| 541 | var->format = variable_default_display (var); |
| 542 | } |
| 543 | |
| 544 | if (varobj_value_is_changeable_p (var) |
| 545 | && var->value && !value_lazy (var->value)) |
| 546 | { |
| 547 | var->print_value = varobj_value_get_print_value (var->value, |
| 548 | var->format, var); |
| 549 | } |
| 550 | |
| 551 | return var->format; |
| 552 | } |
| 553 | |
| 554 | enum varobj_display_formats |
| 555 | varobj_get_display_format (const struct varobj *var) |
| 556 | { |
| 557 | return var->format; |
| 558 | } |
| 559 | |
| 560 | gdb::unique_xmalloc_ptr<char> |
| 561 | varobj_get_display_hint (const struct varobj *var) |
| 562 | { |
| 563 | gdb::unique_xmalloc_ptr<char> result; |
| 564 | |
| 565 | #if HAVE_PYTHON |
| 566 | if (!gdb_python_initialized) |
| 567 | return NULL; |
| 568 | |
| 569 | gdbpy_enter_varobj enter_py (var); |
| 570 | |
| 571 | if (var->dynamic->pretty_printer != NULL) |
| 572 | result = gdbpy_get_display_hint (var->dynamic->pretty_printer); |
| 573 | #endif |
| 574 | |
| 575 | return result; |
| 576 | } |
| 577 | |
| 578 | /* Return true if the varobj has items after TO, false otherwise. */ |
| 579 | |
| 580 | int |
| 581 | varobj_has_more (const struct varobj *var, int to) |
| 582 | { |
| 583 | if (VEC_length (varobj_p, var->children) > to) |
| 584 | return 1; |
| 585 | return ((to == -1 || VEC_length (varobj_p, var->children) == to) |
| 586 | && (var->dynamic->saved_item != NULL)); |
| 587 | } |
| 588 | |
| 589 | /* If the variable object is bound to a specific thread, that |
| 590 | is its evaluation can always be done in context of a frame |
| 591 | inside that thread, returns GDB id of the thread -- which |
| 592 | is always positive. Otherwise, returns -1. */ |
| 593 | int |
| 594 | varobj_get_thread_id (const struct varobj *var) |
| 595 | { |
| 596 | if (var->root->valid_block && var->root->thread_id > 0) |
| 597 | return var->root->thread_id; |
| 598 | else |
| 599 | return -1; |
| 600 | } |
| 601 | |
| 602 | void |
| 603 | varobj_set_frozen (struct varobj *var, int frozen) |
| 604 | { |
| 605 | /* When a variable is unfrozen, we don't fetch its value. |
| 606 | The 'not_fetched' flag remains set, so next -var-update |
| 607 | won't complain. |
| 608 | |
| 609 | We don't fetch the value, because for structures the client |
| 610 | should do -var-update anyway. It would be bad to have different |
| 611 | client-size logic for structure and other types. */ |
| 612 | var->frozen = frozen; |
| 613 | } |
| 614 | |
| 615 | int |
| 616 | varobj_get_frozen (const struct varobj *var) |
| 617 | { |
| 618 | return var->frozen; |
| 619 | } |
| 620 | |
| 621 | /* A helper function that restricts a range to what is actually |
| 622 | available in a VEC. This follows the usual rules for the meaning |
| 623 | of FROM and TO -- if either is negative, the entire range is |
| 624 | used. */ |
| 625 | |
| 626 | void |
| 627 | varobj_restrict_range (VEC (varobj_p) *children, int *from, int *to) |
| 628 | { |
| 629 | if (*from < 0 || *to < 0) |
| 630 | { |
| 631 | *from = 0; |
| 632 | *to = VEC_length (varobj_p, children); |
| 633 | } |
| 634 | else |
| 635 | { |
| 636 | if (*from > VEC_length (varobj_p, children)) |
| 637 | *from = VEC_length (varobj_p, children); |
| 638 | if (*to > VEC_length (varobj_p, children)) |
| 639 | *to = VEC_length (varobj_p, children); |
| 640 | if (*from > *to) |
| 641 | *from = *to; |
| 642 | } |
| 643 | } |
| 644 | |
| 645 | /* A helper for update_dynamic_varobj_children that installs a new |
| 646 | child when needed. */ |
| 647 | |
| 648 | static void |
| 649 | install_dynamic_child (struct varobj *var, |
| 650 | VEC (varobj_p) **changed, |
| 651 | VEC (varobj_p) **type_changed, |
| 652 | VEC (varobj_p) **newobj, |
| 653 | VEC (varobj_p) **unchanged, |
| 654 | int *cchanged, |
| 655 | int index, |
| 656 | struct varobj_item *item) |
| 657 | { |
| 658 | if (VEC_length (varobj_p, var->children) < index + 1) |
| 659 | { |
| 660 | /* There's no child yet. */ |
| 661 | struct varobj *child = varobj_add_child (var, item); |
| 662 | |
| 663 | if (newobj) |
| 664 | { |
| 665 | VEC_safe_push (varobj_p, *newobj, child); |
| 666 | *cchanged = 1; |
| 667 | } |
| 668 | } |
| 669 | else |
| 670 | { |
| 671 | varobj_p existing = VEC_index (varobj_p, var->children, index); |
| 672 | int type_updated = update_type_if_necessary (existing, item->value); |
| 673 | |
| 674 | if (type_updated) |
| 675 | { |
| 676 | if (type_changed) |
| 677 | VEC_safe_push (varobj_p, *type_changed, existing); |
| 678 | } |
| 679 | if (install_new_value (existing, item->value, 0)) |
| 680 | { |
| 681 | if (!type_updated && changed) |
| 682 | VEC_safe_push (varobj_p, *changed, existing); |
| 683 | } |
| 684 | else if (!type_updated && unchanged) |
| 685 | VEC_safe_push (varobj_p, *unchanged, existing); |
| 686 | } |
| 687 | } |
| 688 | |
| 689 | #if HAVE_PYTHON |
| 690 | |
| 691 | static int |
| 692 | dynamic_varobj_has_child_method (const struct varobj *var) |
| 693 | { |
| 694 | PyObject *printer = var->dynamic->pretty_printer; |
| 695 | |
| 696 | if (!gdb_python_initialized) |
| 697 | return 0; |
| 698 | |
| 699 | gdbpy_enter_varobj enter_py (var); |
| 700 | return PyObject_HasAttr (printer, gdbpy_children_cst); |
| 701 | } |
| 702 | #endif |
| 703 | |
| 704 | /* A factory for creating dynamic varobj's iterators. Returns an |
| 705 | iterator object suitable for iterating over VAR's children. */ |
| 706 | |
| 707 | static struct varobj_iter * |
| 708 | varobj_get_iterator (struct varobj *var) |
| 709 | { |
| 710 | #if HAVE_PYTHON |
| 711 | if (var->dynamic->pretty_printer) |
| 712 | return py_varobj_get_iterator (var, var->dynamic->pretty_printer); |
| 713 | #endif |
| 714 | |
| 715 | gdb_assert_not_reached (_("\ |
| 716 | requested an iterator from a non-dynamic varobj")); |
| 717 | } |
| 718 | |
| 719 | /* Release and clear VAR's saved item, if any. */ |
| 720 | |
| 721 | static void |
| 722 | varobj_clear_saved_item (struct varobj_dynamic *var) |
| 723 | { |
| 724 | if (var->saved_item != NULL) |
| 725 | { |
| 726 | value_free (var->saved_item->value); |
| 727 | delete var->saved_item; |
| 728 | var->saved_item = NULL; |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | static int |
| 733 | update_dynamic_varobj_children (struct varobj *var, |
| 734 | VEC (varobj_p) **changed, |
| 735 | VEC (varobj_p) **type_changed, |
| 736 | VEC (varobj_p) **newobj, |
| 737 | VEC (varobj_p) **unchanged, |
| 738 | int *cchanged, |
| 739 | int update_children, |
| 740 | int from, |
| 741 | int to) |
| 742 | { |
| 743 | int i; |
| 744 | |
| 745 | *cchanged = 0; |
| 746 | |
| 747 | if (update_children || var->dynamic->child_iter == NULL) |
| 748 | { |
| 749 | varobj_iter_delete (var->dynamic->child_iter); |
| 750 | var->dynamic->child_iter = varobj_get_iterator (var); |
| 751 | |
| 752 | varobj_clear_saved_item (var->dynamic); |
| 753 | |
| 754 | i = 0; |
| 755 | |
| 756 | if (var->dynamic->child_iter == NULL) |
| 757 | return 0; |
| 758 | } |
| 759 | else |
| 760 | i = VEC_length (varobj_p, var->children); |
| 761 | |
| 762 | /* We ask for one extra child, so that MI can report whether there |
| 763 | are more children. */ |
| 764 | for (; to < 0 || i < to + 1; ++i) |
| 765 | { |
| 766 | varobj_item *item; |
| 767 | |
| 768 | /* See if there was a leftover from last time. */ |
| 769 | if (var->dynamic->saved_item != NULL) |
| 770 | { |
| 771 | item = var->dynamic->saved_item; |
| 772 | var->dynamic->saved_item = NULL; |
| 773 | } |
| 774 | else |
| 775 | { |
| 776 | item = varobj_iter_next (var->dynamic->child_iter); |
| 777 | /* Release vitem->value so its lifetime is not bound to the |
| 778 | execution of a command. */ |
| 779 | if (item != NULL && item->value != NULL) |
| 780 | release_value_or_incref (item->value); |
| 781 | } |
| 782 | |
| 783 | if (item == NULL) |
| 784 | { |
| 785 | /* Iteration is done. Remove iterator from VAR. */ |
| 786 | varobj_iter_delete (var->dynamic->child_iter); |
| 787 | var->dynamic->child_iter = NULL; |
| 788 | break; |
| 789 | } |
| 790 | /* We don't want to push the extra child on any report list. */ |
| 791 | if (to < 0 || i < to) |
| 792 | { |
| 793 | int can_mention = from < 0 || i >= from; |
| 794 | |
| 795 | install_dynamic_child (var, can_mention ? changed : NULL, |
| 796 | can_mention ? type_changed : NULL, |
| 797 | can_mention ? newobj : NULL, |
| 798 | can_mention ? unchanged : NULL, |
| 799 | can_mention ? cchanged : NULL, i, |
| 800 | item); |
| 801 | |
| 802 | delete item; |
| 803 | } |
| 804 | else |
| 805 | { |
| 806 | var->dynamic->saved_item = item; |
| 807 | |
| 808 | /* We want to truncate the child list just before this |
| 809 | element. */ |
| 810 | break; |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | if (i < VEC_length (varobj_p, var->children)) |
| 815 | { |
| 816 | int j; |
| 817 | |
| 818 | *cchanged = 1; |
| 819 | for (j = i; j < VEC_length (varobj_p, var->children); ++j) |
| 820 | varobj_delete (VEC_index (varobj_p, var->children, j), 0); |
| 821 | VEC_truncate (varobj_p, var->children, i); |
| 822 | } |
| 823 | |
| 824 | /* If there are fewer children than requested, note that the list of |
| 825 | children changed. */ |
| 826 | if (to >= 0 && VEC_length (varobj_p, var->children) < to) |
| 827 | *cchanged = 1; |
| 828 | |
| 829 | var->num_children = VEC_length (varobj_p, var->children); |
| 830 | |
| 831 | return 1; |
| 832 | } |
| 833 | |
| 834 | int |
| 835 | varobj_get_num_children (struct varobj *var) |
| 836 | { |
| 837 | if (var->num_children == -1) |
| 838 | { |
| 839 | if (varobj_is_dynamic_p (var)) |
| 840 | { |
| 841 | int dummy; |
| 842 | |
| 843 | /* If we have a dynamic varobj, don't report -1 children. |
| 844 | So, try to fetch some children first. */ |
| 845 | update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, &dummy, |
| 846 | 0, 0, 0); |
| 847 | } |
| 848 | else |
| 849 | var->num_children = number_of_children (var); |
| 850 | } |
| 851 | |
| 852 | return var->num_children >= 0 ? var->num_children : 0; |
| 853 | } |
| 854 | |
| 855 | /* Creates a list of the immediate children of a variable object; |
| 856 | the return code is the number of such children or -1 on error. */ |
| 857 | |
| 858 | VEC (varobj_p)* |
| 859 | varobj_list_children (struct varobj *var, int *from, int *to) |
| 860 | { |
| 861 | int i, children_changed; |
| 862 | |
| 863 | var->dynamic->children_requested = 1; |
| 864 | |
| 865 | if (varobj_is_dynamic_p (var)) |
| 866 | { |
| 867 | /* This, in theory, can result in the number of children changing without |
| 868 | frontend noticing. But well, calling -var-list-children on the same |
| 869 | varobj twice is not something a sane frontend would do. */ |
| 870 | update_dynamic_varobj_children (var, NULL, NULL, NULL, NULL, |
| 871 | &children_changed, 0, 0, *to); |
| 872 | varobj_restrict_range (var->children, from, to); |
| 873 | return var->children; |
| 874 | } |
| 875 | |
| 876 | if (var->num_children == -1) |
| 877 | var->num_children = number_of_children (var); |
| 878 | |
| 879 | /* If that failed, give up. */ |
| 880 | if (var->num_children == -1) |
| 881 | return var->children; |
| 882 | |
| 883 | /* If we're called when the list of children is not yet initialized, |
| 884 | allocate enough elements in it. */ |
| 885 | while (VEC_length (varobj_p, var->children) < var->num_children) |
| 886 | VEC_safe_push (varobj_p, var->children, NULL); |
| 887 | |
| 888 | for (i = 0; i < var->num_children; i++) |
| 889 | { |
| 890 | varobj_p existing = VEC_index (varobj_p, var->children, i); |
| 891 | |
| 892 | if (existing == NULL) |
| 893 | { |
| 894 | /* Either it's the first call to varobj_list_children for |
| 895 | this variable object, and the child was never created, |
| 896 | or it was explicitly deleted by the client. */ |
| 897 | std::string name = name_of_child (var, i); |
| 898 | existing = create_child (var, i, name); |
| 899 | VEC_replace (varobj_p, var->children, i, existing); |
| 900 | } |
| 901 | } |
| 902 | |
| 903 | varobj_restrict_range (var->children, from, to); |
| 904 | return var->children; |
| 905 | } |
| 906 | |
| 907 | static struct varobj * |
| 908 | varobj_add_child (struct varobj *var, struct varobj_item *item) |
| 909 | { |
| 910 | varobj_p v = create_child_with_value (var, |
| 911 | VEC_length (varobj_p, var->children), |
| 912 | item); |
| 913 | |
| 914 | VEC_safe_push (varobj_p, var->children, v); |
| 915 | return v; |
| 916 | } |
| 917 | |
| 918 | /* Obtain the type of an object Variable as a string similar to the one gdb |
| 919 | prints on the console. The caller is responsible for freeing the string. |
| 920 | */ |
| 921 | |
| 922 | std::string |
| 923 | varobj_get_type (struct varobj *var) |
| 924 | { |
| 925 | /* For the "fake" variables, do not return a type. (Its type is |
| 926 | NULL, too.) |
| 927 | Do not return a type for invalid variables as well. */ |
| 928 | if (CPLUS_FAKE_CHILD (var) || !var->root->is_valid) |
| 929 | return std::string (); |
| 930 | |
| 931 | return type_to_string (var->type); |
| 932 | } |
| 933 | |
| 934 | /* Obtain the type of an object variable. */ |
| 935 | |
| 936 | struct type * |
| 937 | varobj_get_gdb_type (const struct varobj *var) |
| 938 | { |
| 939 | return var->type; |
| 940 | } |
| 941 | |
| 942 | /* Is VAR a path expression parent, i.e., can it be used to construct |
| 943 | a valid path expression? */ |
| 944 | |
| 945 | static int |
| 946 | is_path_expr_parent (const struct varobj *var) |
| 947 | { |
| 948 | gdb_assert (var->root->lang_ops->is_path_expr_parent != NULL); |
| 949 | return var->root->lang_ops->is_path_expr_parent (var); |
| 950 | } |
| 951 | |
| 952 | /* Is VAR a path expression parent, i.e., can it be used to construct |
| 953 | a valid path expression? By default we assume any VAR can be a path |
| 954 | parent. */ |
| 955 | |
| 956 | int |
| 957 | varobj_default_is_path_expr_parent (const struct varobj *var) |
| 958 | { |
| 959 | return 1; |
| 960 | } |
| 961 | |
| 962 | /* Return the path expression parent for VAR. */ |
| 963 | |
| 964 | const struct varobj * |
| 965 | varobj_get_path_expr_parent (const struct varobj *var) |
| 966 | { |
| 967 | const struct varobj *parent = var; |
| 968 | |
| 969 | while (!is_root_p (parent) && !is_path_expr_parent (parent)) |
| 970 | parent = parent->parent; |
| 971 | |
| 972 | return parent; |
| 973 | } |
| 974 | |
| 975 | /* Return a pointer to the full rooted expression of varobj VAR. |
| 976 | If it has not been computed yet, compute it. */ |
| 977 | |
| 978 | const char * |
| 979 | varobj_get_path_expr (const struct varobj *var) |
| 980 | { |
| 981 | if (var->path_expr.empty ()) |
| 982 | { |
| 983 | /* For root varobjs, we initialize path_expr |
| 984 | when creating varobj, so here it should be |
| 985 | child varobj. */ |
| 986 | struct varobj *mutable_var = (struct varobj *) var; |
| 987 | gdb_assert (!is_root_p (var)); |
| 988 | |
| 989 | mutable_var->path_expr = (*var->root->lang_ops->path_expr_of_child) (var); |
| 990 | } |
| 991 | |
| 992 | return var->path_expr.c_str (); |
| 993 | } |
| 994 | |
| 995 | const struct language_defn * |
| 996 | varobj_get_language (const struct varobj *var) |
| 997 | { |
| 998 | return var->root->exp->language_defn; |
| 999 | } |
| 1000 | |
| 1001 | int |
| 1002 | varobj_get_attributes (const struct varobj *var) |
| 1003 | { |
| 1004 | int attributes = 0; |
| 1005 | |
| 1006 | if (varobj_editable_p (var)) |
| 1007 | /* FIXME: define masks for attributes. */ |
| 1008 | attributes |= 0x00000001; /* Editable */ |
| 1009 | |
| 1010 | return attributes; |
| 1011 | } |
| 1012 | |
| 1013 | /* Return true if VAR is a dynamic varobj. */ |
| 1014 | |
| 1015 | int |
| 1016 | varobj_is_dynamic_p (const struct varobj *var) |
| 1017 | { |
| 1018 | return var->dynamic->pretty_printer != NULL; |
| 1019 | } |
| 1020 | |
| 1021 | std::string |
| 1022 | varobj_get_formatted_value (struct varobj *var, |
| 1023 | enum varobj_display_formats format) |
| 1024 | { |
| 1025 | return my_value_of_variable (var, format); |
| 1026 | } |
| 1027 | |
| 1028 | std::string |
| 1029 | varobj_get_value (struct varobj *var) |
| 1030 | { |
| 1031 | return my_value_of_variable (var, var->format); |
| 1032 | } |
| 1033 | |
| 1034 | /* Set the value of an object variable (if it is editable) to the |
| 1035 | value of the given expression. */ |
| 1036 | /* Note: Invokes functions that can call error(). */ |
| 1037 | |
| 1038 | int |
| 1039 | varobj_set_value (struct varobj *var, const char *expression) |
| 1040 | { |
| 1041 | struct value *val = NULL; /* Initialize to keep gcc happy. */ |
| 1042 | /* The argument "expression" contains the variable's new value. |
| 1043 | We need to first construct a legal expression for this -- ugh! */ |
| 1044 | /* Does this cover all the bases? */ |
| 1045 | struct value *value = NULL; /* Initialize to keep gcc happy. */ |
| 1046 | int saved_input_radix = input_radix; |
| 1047 | const char *s = expression; |
| 1048 | |
| 1049 | gdb_assert (varobj_editable_p (var)); |
| 1050 | |
| 1051 | input_radix = 10; /* ALWAYS reset to decimal temporarily. */ |
| 1052 | expression_up exp = parse_exp_1 (&s, 0, 0, 0); |
| 1053 | TRY |
| 1054 | { |
| 1055 | value = evaluate_expression (exp.get ()); |
| 1056 | } |
| 1057 | |
| 1058 | CATCH (except, RETURN_MASK_ERROR) |
| 1059 | { |
| 1060 | /* We cannot proceed without a valid expression. */ |
| 1061 | return 0; |
| 1062 | } |
| 1063 | END_CATCH |
| 1064 | |
| 1065 | /* All types that are editable must also be changeable. */ |
| 1066 | gdb_assert (varobj_value_is_changeable_p (var)); |
| 1067 | |
| 1068 | /* The value of a changeable variable object must not be lazy. */ |
| 1069 | gdb_assert (!value_lazy (var->value)); |
| 1070 | |
| 1071 | /* Need to coerce the input. We want to check if the |
| 1072 | value of the variable object will be different |
| 1073 | after assignment, and the first thing value_assign |
| 1074 | does is coerce the input. |
| 1075 | For example, if we are assigning an array to a pointer variable we |
| 1076 | should compare the pointer with the array's address, not with the |
| 1077 | array's content. */ |
| 1078 | value = coerce_array (value); |
| 1079 | |
| 1080 | /* The new value may be lazy. value_assign, or |
| 1081 | rather value_contents, will take care of this. */ |
| 1082 | TRY |
| 1083 | { |
| 1084 | val = value_assign (var->value, value); |
| 1085 | } |
| 1086 | |
| 1087 | CATCH (except, RETURN_MASK_ERROR) |
| 1088 | { |
| 1089 | return 0; |
| 1090 | } |
| 1091 | END_CATCH |
| 1092 | |
| 1093 | /* If the value has changed, record it, so that next -var-update can |
| 1094 | report this change. If a variable had a value of '1', we've set it |
| 1095 | to '333' and then set again to '1', when -var-update will report this |
| 1096 | variable as changed -- because the first assignment has set the |
| 1097 | 'updated' flag. There's no need to optimize that, because return value |
| 1098 | of -var-update should be considered an approximation. */ |
| 1099 | var->updated = install_new_value (var, val, 0 /* Compare values. */); |
| 1100 | input_radix = saved_input_radix; |
| 1101 | return 1; |
| 1102 | } |
| 1103 | |
| 1104 | #if HAVE_PYTHON |
| 1105 | |
| 1106 | /* A helper function to install a constructor function and visualizer |
| 1107 | in a varobj_dynamic. */ |
| 1108 | |
| 1109 | static void |
| 1110 | install_visualizer (struct varobj_dynamic *var, PyObject *constructor, |
| 1111 | PyObject *visualizer) |
| 1112 | { |
| 1113 | Py_XDECREF (var->constructor); |
| 1114 | var->constructor = constructor; |
| 1115 | |
| 1116 | Py_XDECREF (var->pretty_printer); |
| 1117 | var->pretty_printer = visualizer; |
| 1118 | |
| 1119 | varobj_iter_delete (var->child_iter); |
| 1120 | var->child_iter = NULL; |
| 1121 | } |
| 1122 | |
| 1123 | /* Install the default visualizer for VAR. */ |
| 1124 | |
| 1125 | static void |
| 1126 | install_default_visualizer (struct varobj *var) |
| 1127 | { |
| 1128 | /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
| 1129 | if (CPLUS_FAKE_CHILD (var)) |
| 1130 | return; |
| 1131 | |
| 1132 | if (pretty_printing) |
| 1133 | { |
| 1134 | PyObject *pretty_printer = NULL; |
| 1135 | |
| 1136 | if (var->value) |
| 1137 | { |
| 1138 | pretty_printer = gdbpy_get_varobj_pretty_printer (var->value); |
| 1139 | if (! pretty_printer) |
| 1140 | { |
| 1141 | gdbpy_print_stack (); |
| 1142 | error (_("Cannot instantiate printer for default visualizer")); |
| 1143 | } |
| 1144 | } |
| 1145 | |
| 1146 | if (pretty_printer == Py_None) |
| 1147 | { |
| 1148 | Py_DECREF (pretty_printer); |
| 1149 | pretty_printer = NULL; |
| 1150 | } |
| 1151 | |
| 1152 | install_visualizer (var->dynamic, NULL, pretty_printer); |
| 1153 | } |
| 1154 | } |
| 1155 | |
| 1156 | /* Instantiate and install a visualizer for VAR using CONSTRUCTOR to |
| 1157 | make a new object. */ |
| 1158 | |
| 1159 | static void |
| 1160 | construct_visualizer (struct varobj *var, PyObject *constructor) |
| 1161 | { |
| 1162 | PyObject *pretty_printer; |
| 1163 | |
| 1164 | /* Do not install a visualizer on a CPLUS_FAKE_CHILD. */ |
| 1165 | if (CPLUS_FAKE_CHILD (var)) |
| 1166 | return; |
| 1167 | |
| 1168 | Py_INCREF (constructor); |
| 1169 | if (constructor == Py_None) |
| 1170 | pretty_printer = NULL; |
| 1171 | else |
| 1172 | { |
| 1173 | pretty_printer = instantiate_pretty_printer (constructor, var->value); |
| 1174 | if (! pretty_printer) |
| 1175 | { |
| 1176 | gdbpy_print_stack (); |
| 1177 | Py_DECREF (constructor); |
| 1178 | constructor = Py_None; |
| 1179 | Py_INCREF (constructor); |
| 1180 | } |
| 1181 | |
| 1182 | if (pretty_printer == Py_None) |
| 1183 | { |
| 1184 | Py_DECREF (pretty_printer); |
| 1185 | pretty_printer = NULL; |
| 1186 | } |
| 1187 | } |
| 1188 | |
| 1189 | install_visualizer (var->dynamic, constructor, pretty_printer); |
| 1190 | } |
| 1191 | |
| 1192 | #endif /* HAVE_PYTHON */ |
| 1193 | |
| 1194 | /* A helper function for install_new_value. This creates and installs |
| 1195 | a visualizer for VAR, if appropriate. */ |
| 1196 | |
| 1197 | static void |
| 1198 | install_new_value_visualizer (struct varobj *var) |
| 1199 | { |
| 1200 | #if HAVE_PYTHON |
| 1201 | /* If the constructor is None, then we want the raw value. If VAR |
| 1202 | does not have a value, just skip this. */ |
| 1203 | if (!gdb_python_initialized) |
| 1204 | return; |
| 1205 | |
| 1206 | if (var->dynamic->constructor != Py_None && var->value != NULL) |
| 1207 | { |
| 1208 | gdbpy_enter_varobj enter_py (var); |
| 1209 | |
| 1210 | if (var->dynamic->constructor == NULL) |
| 1211 | install_default_visualizer (var); |
| 1212 | else |
| 1213 | construct_visualizer (var, var->dynamic->constructor); |
| 1214 | } |
| 1215 | #else |
| 1216 | /* Do nothing. */ |
| 1217 | #endif |
| 1218 | } |
| 1219 | |
| 1220 | /* When using RTTI to determine variable type it may be changed in runtime when |
| 1221 | the variable value is changed. This function checks whether type of varobj |
| 1222 | VAR will change when a new value NEW_VALUE is assigned and if it is so |
| 1223 | updates the type of VAR. */ |
| 1224 | |
| 1225 | static int |
| 1226 | update_type_if_necessary (struct varobj *var, struct value *new_value) |
| 1227 | { |
| 1228 | if (new_value) |
| 1229 | { |
| 1230 | struct value_print_options opts; |
| 1231 | |
| 1232 | get_user_print_options (&opts); |
| 1233 | if (opts.objectprint) |
| 1234 | { |
| 1235 | struct type *new_type = value_actual_type (new_value, 0, 0); |
| 1236 | std::string new_type_str = type_to_string (new_type); |
| 1237 | std::string curr_type_str = varobj_get_type (var); |
| 1238 | |
| 1239 | /* Did the type name change? */ |
| 1240 | if (curr_type_str != new_type_str) |
| 1241 | { |
| 1242 | var->type = new_type; |
| 1243 | |
| 1244 | /* This information may be not valid for a new type. */ |
| 1245 | varobj_delete (var, 1); |
| 1246 | VEC_free (varobj_p, var->children); |
| 1247 | var->num_children = -1; |
| 1248 | return 1; |
| 1249 | } |
| 1250 | } |
| 1251 | } |
| 1252 | |
| 1253 | return 0; |
| 1254 | } |
| 1255 | |
| 1256 | /* Assign a new value to a variable object. If INITIAL is non-zero, |
| 1257 | this is the first assignement after the variable object was just |
| 1258 | created, or changed type. In that case, just assign the value |
| 1259 | and return 0. |
| 1260 | Otherwise, assign the new value, and return 1 if the value is |
| 1261 | different from the current one, 0 otherwise. The comparison is |
| 1262 | done on textual representation of value. Therefore, some types |
| 1263 | need not be compared. E.g. for structures the reported value is |
| 1264 | always "{...}", so no comparison is necessary here. If the old |
| 1265 | value was NULL and new one is not, or vice versa, we always return 1. |
| 1266 | |
| 1267 | The VALUE parameter should not be released -- the function will |
| 1268 | take care of releasing it when needed. */ |
| 1269 | static int |
| 1270 | install_new_value (struct varobj *var, struct value *value, int initial) |
| 1271 | { |
| 1272 | int changeable; |
| 1273 | int need_to_fetch; |
| 1274 | int changed = 0; |
| 1275 | int intentionally_not_fetched = 0; |
| 1276 | |
| 1277 | /* We need to know the varobj's type to decide if the value should |
| 1278 | be fetched or not. C++ fake children (public/protected/private) |
| 1279 | don't have a type. */ |
| 1280 | gdb_assert (var->type || CPLUS_FAKE_CHILD (var)); |
| 1281 | changeable = varobj_value_is_changeable_p (var); |
| 1282 | |
| 1283 | /* If the type has custom visualizer, we consider it to be always |
| 1284 | changeable. FIXME: need to make sure this behaviour will not |
| 1285 | mess up read-sensitive values. */ |
| 1286 | if (var->dynamic->pretty_printer != NULL) |
| 1287 | changeable = 1; |
| 1288 | |
| 1289 | need_to_fetch = changeable; |
| 1290 | |
| 1291 | /* We are not interested in the address of references, and given |
| 1292 | that in C++ a reference is not rebindable, it cannot |
| 1293 | meaningfully change. So, get hold of the real value. */ |
| 1294 | if (value) |
| 1295 | value = coerce_ref (value); |
| 1296 | |
| 1297 | if (var->type && TYPE_CODE (var->type) == TYPE_CODE_UNION) |
| 1298 | /* For unions, we need to fetch the value implicitly because |
| 1299 | of implementation of union member fetch. When gdb |
| 1300 | creates a value for a field and the value of the enclosing |
| 1301 | structure is not lazy, it immediately copies the necessary |
| 1302 | bytes from the enclosing values. If the enclosing value is |
| 1303 | lazy, the call to value_fetch_lazy on the field will read |
| 1304 | the data from memory. For unions, that means we'll read the |
| 1305 | same memory more than once, which is not desirable. So |
| 1306 | fetch now. */ |
| 1307 | need_to_fetch = 1; |
| 1308 | |
| 1309 | /* The new value might be lazy. If the type is changeable, |
| 1310 | that is we'll be comparing values of this type, fetch the |
| 1311 | value now. Otherwise, on the next update the old value |
| 1312 | will be lazy, which means we've lost that old value. */ |
| 1313 | if (need_to_fetch && value && value_lazy (value)) |
| 1314 | { |
| 1315 | const struct varobj *parent = var->parent; |
| 1316 | int frozen = var->frozen; |
| 1317 | |
| 1318 | for (; !frozen && parent; parent = parent->parent) |
| 1319 | frozen |= parent->frozen; |
| 1320 | |
| 1321 | if (frozen && initial) |
| 1322 | { |
| 1323 | /* For variables that are frozen, or are children of frozen |
| 1324 | variables, we don't do fetch on initial assignment. |
| 1325 | For non-initial assignemnt we do the fetch, since it means we're |
| 1326 | explicitly asked to compare the new value with the old one. */ |
| 1327 | intentionally_not_fetched = 1; |
| 1328 | } |
| 1329 | else |
| 1330 | { |
| 1331 | |
| 1332 | TRY |
| 1333 | { |
| 1334 | value_fetch_lazy (value); |
| 1335 | } |
| 1336 | |
| 1337 | CATCH (except, RETURN_MASK_ERROR) |
| 1338 | { |
| 1339 | /* Set the value to NULL, so that for the next -var-update, |
| 1340 | we don't try to compare the new value with this value, |
| 1341 | that we couldn't even read. */ |
| 1342 | value = NULL; |
| 1343 | } |
| 1344 | END_CATCH |
| 1345 | } |
| 1346 | } |
| 1347 | |
| 1348 | /* Get a reference now, before possibly passing it to any Python |
| 1349 | code that might release it. */ |
| 1350 | if (value != NULL) |
| 1351 | value_incref (value); |
| 1352 | |
| 1353 | /* Below, we'll be comparing string rendering of old and new |
| 1354 | values. Don't get string rendering if the value is |
| 1355 | lazy -- if it is, the code above has decided that the value |
| 1356 | should not be fetched. */ |
| 1357 | std::string print_value; |
| 1358 | if (value != NULL && !value_lazy (value) |
| 1359 | && var->dynamic->pretty_printer == NULL) |
| 1360 | print_value = varobj_value_get_print_value (value, var->format, var); |
| 1361 | |
| 1362 | /* If the type is changeable, compare the old and the new values. |
| 1363 | If this is the initial assignment, we don't have any old value |
| 1364 | to compare with. */ |
| 1365 | if (!initial && changeable) |
| 1366 | { |
| 1367 | /* If the value of the varobj was changed by -var-set-value, |
| 1368 | then the value in the varobj and in the target is the same. |
| 1369 | However, that value is different from the value that the |
| 1370 | varobj had after the previous -var-update. So need to the |
| 1371 | varobj as changed. */ |
| 1372 | if (var->updated) |
| 1373 | { |
| 1374 | changed = 1; |
| 1375 | } |
| 1376 | else if (var->dynamic->pretty_printer == NULL) |
| 1377 | { |
| 1378 | /* Try to compare the values. That requires that both |
| 1379 | values are non-lazy. */ |
| 1380 | if (var->not_fetched && value_lazy (var->value)) |
| 1381 | { |
| 1382 | /* This is a frozen varobj and the value was never read. |
| 1383 | Presumably, UI shows some "never read" indicator. |
| 1384 | Now that we've fetched the real value, we need to report |
| 1385 | this varobj as changed so that UI can show the real |
| 1386 | value. */ |
| 1387 | changed = 1; |
| 1388 | } |
| 1389 | else if (var->value == NULL && value == NULL) |
| 1390 | /* Equal. */ |
| 1391 | ; |
| 1392 | else if (var->value == NULL || value == NULL) |
| 1393 | { |
| 1394 | changed = 1; |
| 1395 | } |
| 1396 | else |
| 1397 | { |
| 1398 | gdb_assert (!value_lazy (var->value)); |
| 1399 | gdb_assert (!value_lazy (value)); |
| 1400 | |
| 1401 | gdb_assert (!var->print_value.empty () && !print_value.empty ()); |
| 1402 | if (var->print_value != print_value) |
| 1403 | changed = 1; |
| 1404 | } |
| 1405 | } |
| 1406 | } |
| 1407 | |
| 1408 | if (!initial && !changeable) |
| 1409 | { |
| 1410 | /* For values that are not changeable, we don't compare the values. |
| 1411 | However, we want to notice if a value was not NULL and now is NULL, |
| 1412 | or vise versa, so that we report when top-level varobjs come in scope |
| 1413 | and leave the scope. */ |
| 1414 | changed = (var->value != NULL) != (value != NULL); |
| 1415 | } |
| 1416 | |
| 1417 | /* We must always keep the new value, since children depend on it. */ |
| 1418 | if (var->value != NULL && var->value != value) |
| 1419 | value_free (var->value); |
| 1420 | var->value = value; |
| 1421 | if (value && value_lazy (value) && intentionally_not_fetched) |
| 1422 | var->not_fetched = 1; |
| 1423 | else |
| 1424 | var->not_fetched = 0; |
| 1425 | var->updated = 0; |
| 1426 | |
| 1427 | install_new_value_visualizer (var); |
| 1428 | |
| 1429 | /* If we installed a pretty-printer, re-compare the printed version |
| 1430 | to see if the variable changed. */ |
| 1431 | if (var->dynamic->pretty_printer != NULL) |
| 1432 | { |
| 1433 | print_value = varobj_value_get_print_value (var->value, var->format, |
| 1434 | var); |
| 1435 | if ((var->print_value.empty () && !print_value.empty ()) |
| 1436 | || (!var->print_value.empty () && print_value.empty ()) |
| 1437 | || (!var->print_value.empty () && !print_value.empty () |
| 1438 | && var->print_value != print_value)) |
| 1439 | changed = 1; |
| 1440 | } |
| 1441 | var->print_value = print_value; |
| 1442 | |
| 1443 | gdb_assert (!var->value || value_type (var->value)); |
| 1444 | |
| 1445 | return changed; |
| 1446 | } |
| 1447 | |
| 1448 | /* Return the requested range for a varobj. VAR is the varobj. FROM |
| 1449 | and TO are out parameters; *FROM and *TO will be set to the |
| 1450 | selected sub-range of VAR. If no range was selected using |
| 1451 | -var-set-update-range, then both will be -1. */ |
| 1452 | void |
| 1453 | varobj_get_child_range (const struct varobj *var, int *from, int *to) |
| 1454 | { |
| 1455 | *from = var->from; |
| 1456 | *to = var->to; |
| 1457 | } |
| 1458 | |
| 1459 | /* Set the selected sub-range of children of VAR to start at index |
| 1460 | FROM and end at index TO. If either FROM or TO is less than zero, |
| 1461 | this is interpreted as a request for all children. */ |
| 1462 | void |
| 1463 | varobj_set_child_range (struct varobj *var, int from, int to) |
| 1464 | { |
| 1465 | var->from = from; |
| 1466 | var->to = to; |
| 1467 | } |
| 1468 | |
| 1469 | void |
| 1470 | varobj_set_visualizer (struct varobj *var, const char *visualizer) |
| 1471 | { |
| 1472 | #if HAVE_PYTHON |
| 1473 | PyObject *mainmod; |
| 1474 | |
| 1475 | if (!gdb_python_initialized) |
| 1476 | return; |
| 1477 | |
| 1478 | gdbpy_enter_varobj enter_py (var); |
| 1479 | |
| 1480 | mainmod = PyImport_AddModule ("__main__"); |
| 1481 | gdbpy_ref<> globals (PyModule_GetDict (mainmod)); |
| 1482 | Py_INCREF (globals.get ()); |
| 1483 | |
| 1484 | gdbpy_ref<> constructor (PyRun_String (visualizer, Py_eval_input, |
| 1485 | globals.get (), globals.get ())); |
| 1486 | |
| 1487 | if (constructor == NULL) |
| 1488 | { |
| 1489 | gdbpy_print_stack (); |
| 1490 | error (_("Could not evaluate visualizer expression: %s"), visualizer); |
| 1491 | } |
| 1492 | |
| 1493 | construct_visualizer (var, constructor.get ()); |
| 1494 | |
| 1495 | /* If there are any children now, wipe them. */ |
| 1496 | varobj_delete (var, 1 /* children only */); |
| 1497 | var->num_children = -1; |
| 1498 | #else |
| 1499 | error (_("Python support required")); |
| 1500 | #endif |
| 1501 | } |
| 1502 | |
| 1503 | /* If NEW_VALUE is the new value of the given varobj (var), return |
| 1504 | non-zero if var has mutated. In other words, if the type of |
| 1505 | the new value is different from the type of the varobj's old |
| 1506 | value. |
| 1507 | |
| 1508 | NEW_VALUE may be NULL, if the varobj is now out of scope. */ |
| 1509 | |
| 1510 | static int |
| 1511 | varobj_value_has_mutated (const struct varobj *var, struct value *new_value, |
| 1512 | struct type *new_type) |
| 1513 | { |
| 1514 | /* If we haven't previously computed the number of children in var, |
| 1515 | it does not matter from the front-end's perspective whether |
| 1516 | the type has mutated or not. For all intents and purposes, |
| 1517 | it has not mutated. */ |
| 1518 | if (var->num_children < 0) |
| 1519 | return 0; |
| 1520 | |
| 1521 | if (var->root->lang_ops->value_has_mutated) |
| 1522 | { |
| 1523 | /* The varobj module, when installing new values, explicitly strips |
| 1524 | references, saying that we're not interested in those addresses. |
| 1525 | But detection of mutation happens before installing the new |
| 1526 | value, so our value may be a reference that we need to strip |
| 1527 | in order to remain consistent. */ |
| 1528 | if (new_value != NULL) |
| 1529 | new_value = coerce_ref (new_value); |
| 1530 | return var->root->lang_ops->value_has_mutated (var, new_value, new_type); |
| 1531 | } |
| 1532 | else |
| 1533 | return 0; |
| 1534 | } |
| 1535 | |
| 1536 | /* Update the values for a variable and its children. This is a |
| 1537 | two-pronged attack. First, re-parse the value for the root's |
| 1538 | expression to see if it's changed. Then go all the way |
| 1539 | through its children, reconstructing them and noting if they've |
| 1540 | changed. |
| 1541 | |
| 1542 | The EXPLICIT parameter specifies if this call is result |
| 1543 | of MI request to update this specific variable, or |
| 1544 | result of implicit -var-update *. For implicit request, we don't |
| 1545 | update frozen variables. |
| 1546 | |
| 1547 | NOTE: This function may delete the caller's varobj. If it |
| 1548 | returns TYPE_CHANGED, then it has done this and VARP will be modified |
| 1549 | to point to the new varobj. */ |
| 1550 | |
| 1551 | VEC(varobj_update_result) * |
| 1552 | varobj_update (struct varobj **varp, int is_explicit) |
| 1553 | { |
| 1554 | int type_changed = 0; |
| 1555 | int i; |
| 1556 | struct value *newobj; |
| 1557 | VEC (varobj_update_result) *stack = NULL; |
| 1558 | VEC (varobj_update_result) *result = NULL; |
| 1559 | |
| 1560 | /* Frozen means frozen -- we don't check for any change in |
| 1561 | this varobj, including its going out of scope, or |
| 1562 | changing type. One use case for frozen varobjs is |
| 1563 | retaining previously evaluated expressions, and we don't |
| 1564 | want them to be reevaluated at all. */ |
| 1565 | if (!is_explicit && (*varp)->frozen) |
| 1566 | return result; |
| 1567 | |
| 1568 | if (!(*varp)->root->is_valid) |
| 1569 | { |
| 1570 | varobj_update_result r = {0}; |
| 1571 | |
| 1572 | r.varobj = *varp; |
| 1573 | r.status = VAROBJ_INVALID; |
| 1574 | VEC_safe_push (varobj_update_result, result, &r); |
| 1575 | return result; |
| 1576 | } |
| 1577 | |
| 1578 | if ((*varp)->root->rootvar == *varp) |
| 1579 | { |
| 1580 | varobj_update_result r = {0}; |
| 1581 | |
| 1582 | r.varobj = *varp; |
| 1583 | r.status = VAROBJ_IN_SCOPE; |
| 1584 | |
| 1585 | /* Update the root variable. value_of_root can return NULL |
| 1586 | if the variable is no longer around, i.e. we stepped out of |
| 1587 | the frame in which a local existed. We are letting the |
| 1588 | value_of_root variable dispose of the varobj if the type |
| 1589 | has changed. */ |
| 1590 | newobj = value_of_root (varp, &type_changed); |
| 1591 | if (update_type_if_necessary(*varp, newobj)) |
| 1592 | type_changed = 1; |
| 1593 | r.varobj = *varp; |
| 1594 | r.type_changed = type_changed; |
| 1595 | if (install_new_value ((*varp), newobj, type_changed)) |
| 1596 | r.changed = 1; |
| 1597 | |
| 1598 | if (newobj == NULL) |
| 1599 | r.status = VAROBJ_NOT_IN_SCOPE; |
| 1600 | r.value_installed = 1; |
| 1601 | |
| 1602 | if (r.status == VAROBJ_NOT_IN_SCOPE) |
| 1603 | { |
| 1604 | if (r.type_changed || r.changed) |
| 1605 | VEC_safe_push (varobj_update_result, result, &r); |
| 1606 | return result; |
| 1607 | } |
| 1608 | |
| 1609 | VEC_safe_push (varobj_update_result, stack, &r); |
| 1610 | } |
| 1611 | else |
| 1612 | { |
| 1613 | varobj_update_result r = {0}; |
| 1614 | |
| 1615 | r.varobj = *varp; |
| 1616 | VEC_safe_push (varobj_update_result, stack, &r); |
| 1617 | } |
| 1618 | |
| 1619 | /* Walk through the children, reconstructing them all. */ |
| 1620 | while (!VEC_empty (varobj_update_result, stack)) |
| 1621 | { |
| 1622 | varobj_update_result r = *(VEC_last (varobj_update_result, stack)); |
| 1623 | struct varobj *v = r.varobj; |
| 1624 | |
| 1625 | VEC_pop (varobj_update_result, stack); |
| 1626 | |
| 1627 | /* Update this variable, unless it's a root, which is already |
| 1628 | updated. */ |
| 1629 | if (!r.value_installed) |
| 1630 | { |
| 1631 | struct type *new_type; |
| 1632 | |
| 1633 | newobj = value_of_child (v->parent, v->index); |
| 1634 | if (update_type_if_necessary(v, newobj)) |
| 1635 | r.type_changed = 1; |
| 1636 | if (newobj) |
| 1637 | new_type = value_type (newobj); |
| 1638 | else |
| 1639 | new_type = v->root->lang_ops->type_of_child (v->parent, v->index); |
| 1640 | |
| 1641 | if (varobj_value_has_mutated (v, newobj, new_type)) |
| 1642 | { |
| 1643 | /* The children are no longer valid; delete them now. |
| 1644 | Report the fact that its type changed as well. */ |
| 1645 | varobj_delete (v, 1 /* only_children */); |
| 1646 | v->num_children = -1; |
| 1647 | v->to = -1; |
| 1648 | v->from = -1; |
| 1649 | v->type = new_type; |
| 1650 | r.type_changed = 1; |
| 1651 | } |
| 1652 | |
| 1653 | if (install_new_value (v, newobj, r.type_changed)) |
| 1654 | { |
| 1655 | r.changed = 1; |
| 1656 | v->updated = 0; |
| 1657 | } |
| 1658 | } |
| 1659 | |
| 1660 | /* We probably should not get children of a dynamic varobj, but |
| 1661 | for which -var-list-children was never invoked. */ |
| 1662 | if (varobj_is_dynamic_p (v)) |
| 1663 | { |
| 1664 | VEC (varobj_p) *changed = 0, *type_changed = 0, *unchanged = 0; |
| 1665 | VEC (varobj_p) *newobj = 0; |
| 1666 | int i, children_changed = 0; |
| 1667 | |
| 1668 | if (v->frozen) |
| 1669 | continue; |
| 1670 | |
| 1671 | if (!v->dynamic->children_requested) |
| 1672 | { |
| 1673 | int dummy; |
| 1674 | |
| 1675 | /* If we initially did not have potential children, but |
| 1676 | now we do, consider the varobj as changed. |
| 1677 | Otherwise, if children were never requested, consider |
| 1678 | it as unchanged -- presumably, such varobj is not yet |
| 1679 | expanded in the UI, so we need not bother getting |
| 1680 | it. */ |
| 1681 | if (!varobj_has_more (v, 0)) |
| 1682 | { |
| 1683 | update_dynamic_varobj_children (v, NULL, NULL, NULL, NULL, |
| 1684 | &dummy, 0, 0, 0); |
| 1685 | if (varobj_has_more (v, 0)) |
| 1686 | r.changed = 1; |
| 1687 | } |
| 1688 | |
| 1689 | if (r.changed) |
| 1690 | VEC_safe_push (varobj_update_result, result, &r); |
| 1691 | |
| 1692 | continue; |
| 1693 | } |
| 1694 | |
| 1695 | /* If update_dynamic_varobj_children returns 0, then we have |
| 1696 | a non-conforming pretty-printer, so we skip it. */ |
| 1697 | if (update_dynamic_varobj_children (v, &changed, &type_changed, &newobj, |
| 1698 | &unchanged, &children_changed, 1, |
| 1699 | v->from, v->to)) |
| 1700 | { |
| 1701 | if (children_changed || newobj) |
| 1702 | { |
| 1703 | r.children_changed = 1; |
| 1704 | r.newobj = newobj; |
| 1705 | } |
| 1706 | /* Push in reverse order so that the first child is |
| 1707 | popped from the work stack first, and so will be |
| 1708 | added to result first. This does not affect |
| 1709 | correctness, just "nicer". */ |
| 1710 | for (i = VEC_length (varobj_p, type_changed) - 1; i >= 0; --i) |
| 1711 | { |
| 1712 | varobj_p tmp = VEC_index (varobj_p, type_changed, i); |
| 1713 | varobj_update_result r = {0}; |
| 1714 | |
| 1715 | /* Type may change only if value was changed. */ |
| 1716 | r.varobj = tmp; |
| 1717 | r.changed = 1; |
| 1718 | r.type_changed = 1; |
| 1719 | r.value_installed = 1; |
| 1720 | VEC_safe_push (varobj_update_result, stack, &r); |
| 1721 | } |
| 1722 | for (i = VEC_length (varobj_p, changed) - 1; i >= 0; --i) |
| 1723 | { |
| 1724 | varobj_p tmp = VEC_index (varobj_p, changed, i); |
| 1725 | varobj_update_result r = {0}; |
| 1726 | |
| 1727 | r.varobj = tmp; |
| 1728 | r.changed = 1; |
| 1729 | r.value_installed = 1; |
| 1730 | VEC_safe_push (varobj_update_result, stack, &r); |
| 1731 | } |
| 1732 | for (i = VEC_length (varobj_p, unchanged) - 1; i >= 0; --i) |
| 1733 | { |
| 1734 | varobj_p tmp = VEC_index (varobj_p, unchanged, i); |
| 1735 | |
| 1736 | if (!tmp->frozen) |
| 1737 | { |
| 1738 | varobj_update_result r = {0}; |
| 1739 | |
| 1740 | r.varobj = tmp; |
| 1741 | r.value_installed = 1; |
| 1742 | VEC_safe_push (varobj_update_result, stack, &r); |
| 1743 | } |
| 1744 | } |
| 1745 | if (r.changed || r.children_changed) |
| 1746 | VEC_safe_push (varobj_update_result, result, &r); |
| 1747 | |
| 1748 | /* Free CHANGED, TYPE_CHANGED and UNCHANGED, but not NEW, |
| 1749 | because NEW has been put into the result vector. */ |
| 1750 | VEC_free (varobj_p, changed); |
| 1751 | VEC_free (varobj_p, type_changed); |
| 1752 | VEC_free (varobj_p, unchanged); |
| 1753 | |
| 1754 | continue; |
| 1755 | } |
| 1756 | } |
| 1757 | |
| 1758 | /* Push any children. Use reverse order so that the first |
| 1759 | child is popped from the work stack first, and so |
| 1760 | will be added to result first. This does not |
| 1761 | affect correctness, just "nicer". */ |
| 1762 | for (i = VEC_length (varobj_p, v->children)-1; i >= 0; --i) |
| 1763 | { |
| 1764 | varobj_p c = VEC_index (varobj_p, v->children, i); |
| 1765 | |
| 1766 | /* Child may be NULL if explicitly deleted by -var-delete. */ |
| 1767 | if (c != NULL && !c->frozen) |
| 1768 | { |
| 1769 | varobj_update_result r = {0}; |
| 1770 | |
| 1771 | r.varobj = c; |
| 1772 | VEC_safe_push (varobj_update_result, stack, &r); |
| 1773 | } |
| 1774 | } |
| 1775 | |
| 1776 | if (r.changed || r.type_changed) |
| 1777 | VEC_safe_push (varobj_update_result, result, &r); |
| 1778 | } |
| 1779 | |
| 1780 | VEC_free (varobj_update_result, stack); |
| 1781 | |
| 1782 | return result; |
| 1783 | } |
| 1784 | \f |
| 1785 | |
| 1786 | /* Helper functions */ |
| 1787 | |
| 1788 | /* |
| 1789 | * Variable object construction/destruction |
| 1790 | */ |
| 1791 | |
| 1792 | static int |
| 1793 | delete_variable (struct varobj *var, int only_children_p) |
| 1794 | { |
| 1795 | int delcount = 0; |
| 1796 | |
| 1797 | delete_variable_1 (&delcount, var, only_children_p, |
| 1798 | 1 /* remove_from_parent_p */ ); |
| 1799 | |
| 1800 | return delcount; |
| 1801 | } |
| 1802 | |
| 1803 | /* Delete the variable object VAR and its children. */ |
| 1804 | /* IMPORTANT NOTE: If we delete a variable which is a child |
| 1805 | and the parent is not removed we dump core. It must be always |
| 1806 | initially called with remove_from_parent_p set. */ |
| 1807 | static void |
| 1808 | delete_variable_1 (int *delcountp, struct varobj *var, int only_children_p, |
| 1809 | int remove_from_parent_p) |
| 1810 | { |
| 1811 | int i; |
| 1812 | |
| 1813 | /* Delete any children of this variable, too. */ |
| 1814 | for (i = 0; i < VEC_length (varobj_p, var->children); ++i) |
| 1815 | { |
| 1816 | varobj_p child = VEC_index (varobj_p, var->children, i); |
| 1817 | |
| 1818 | if (!child) |
| 1819 | continue; |
| 1820 | if (!remove_from_parent_p) |
| 1821 | child->parent = NULL; |
| 1822 | delete_variable_1 (delcountp, child, 0, only_children_p); |
| 1823 | } |
| 1824 | VEC_free (varobj_p, var->children); |
| 1825 | |
| 1826 | /* if we were called to delete only the children we are done here. */ |
| 1827 | if (only_children_p) |
| 1828 | return; |
| 1829 | |
| 1830 | /* Otherwise, add it to the list of deleted ones and proceed to do so. */ |
| 1831 | /* If the name is empty, this is a temporary variable, that has not |
| 1832 | yet been installed, don't report it, it belongs to the caller... */ |
| 1833 | if (!var->obj_name.empty ()) |
| 1834 | { |
| 1835 | *delcountp = *delcountp + 1; |
| 1836 | } |
| 1837 | |
| 1838 | /* If this variable has a parent, remove it from its parent's list. */ |
| 1839 | /* OPTIMIZATION: if the parent of this variable is also being deleted, |
| 1840 | (as indicated by remove_from_parent_p) we don't bother doing an |
| 1841 | expensive list search to find the element to remove when we are |
| 1842 | discarding the list afterwards. */ |
| 1843 | if ((remove_from_parent_p) && (var->parent != NULL)) |
| 1844 | { |
| 1845 | VEC_replace (varobj_p, var->parent->children, var->index, NULL); |
| 1846 | } |
| 1847 | |
| 1848 | if (!var->obj_name.empty ()) |
| 1849 | uninstall_variable (var); |
| 1850 | |
| 1851 | /* Free memory associated with this variable. */ |
| 1852 | free_variable (var); |
| 1853 | } |
| 1854 | |
| 1855 | /* Install the given variable VAR with the object name VAR->OBJ_NAME. */ |
| 1856 | static int |
| 1857 | install_variable (struct varobj *var) |
| 1858 | { |
| 1859 | struct vlist *cv; |
| 1860 | struct vlist *newvl; |
| 1861 | const char *chp; |
| 1862 | unsigned int index = 0; |
| 1863 | unsigned int i = 1; |
| 1864 | |
| 1865 | for (chp = var->obj_name.c_str (); *chp; chp++) |
| 1866 | { |
| 1867 | index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; |
| 1868 | } |
| 1869 | |
| 1870 | cv = *(varobj_table + index); |
| 1871 | while (cv != NULL && cv->var->obj_name != var->obj_name) |
| 1872 | cv = cv->next; |
| 1873 | |
| 1874 | if (cv != NULL) |
| 1875 | error (_("Duplicate variable object name")); |
| 1876 | |
| 1877 | /* Add varobj to hash table. */ |
| 1878 | newvl = XNEW (struct vlist); |
| 1879 | newvl->next = *(varobj_table + index); |
| 1880 | newvl->var = var; |
| 1881 | *(varobj_table + index) = newvl; |
| 1882 | |
| 1883 | /* If root, add varobj to root list. */ |
| 1884 | if (is_root_p (var)) |
| 1885 | { |
| 1886 | /* Add to list of root variables. */ |
| 1887 | if (rootlist == NULL) |
| 1888 | var->root->next = NULL; |
| 1889 | else |
| 1890 | var->root->next = rootlist; |
| 1891 | rootlist = var->root; |
| 1892 | } |
| 1893 | |
| 1894 | return 1; /* OK */ |
| 1895 | } |
| 1896 | |
| 1897 | /* Unistall the object VAR. */ |
| 1898 | static void |
| 1899 | uninstall_variable (struct varobj *var) |
| 1900 | { |
| 1901 | struct vlist *cv; |
| 1902 | struct vlist *prev; |
| 1903 | struct varobj_root *cr; |
| 1904 | struct varobj_root *prer; |
| 1905 | const char *chp; |
| 1906 | unsigned int index = 0; |
| 1907 | unsigned int i = 1; |
| 1908 | |
| 1909 | /* Remove varobj from hash table. */ |
| 1910 | for (chp = var->obj_name.c_str (); *chp; chp++) |
| 1911 | { |
| 1912 | index = (index + (i++ * (unsigned int) *chp)) % VAROBJ_TABLE_SIZE; |
| 1913 | } |
| 1914 | |
| 1915 | cv = *(varobj_table + index); |
| 1916 | prev = NULL; |
| 1917 | while (cv != NULL && cv->var->obj_name != var->obj_name) |
| 1918 | { |
| 1919 | prev = cv; |
| 1920 | cv = cv->next; |
| 1921 | } |
| 1922 | |
| 1923 | if (varobjdebug) |
| 1924 | fprintf_unfiltered (gdb_stdlog, "Deleting %s\n", var->obj_name.c_str ()); |
| 1925 | |
| 1926 | if (cv == NULL) |
| 1927 | { |
| 1928 | warning |
| 1929 | ("Assertion failed: Could not find variable object \"%s\" to delete", |
| 1930 | var->obj_name.c_str ()); |
| 1931 | return; |
| 1932 | } |
| 1933 | |
| 1934 | if (prev == NULL) |
| 1935 | *(varobj_table + index) = cv->next; |
| 1936 | else |
| 1937 | prev->next = cv->next; |
| 1938 | |
| 1939 | xfree (cv); |
| 1940 | |
| 1941 | /* If root, remove varobj from root list. */ |
| 1942 | if (is_root_p (var)) |
| 1943 | { |
| 1944 | /* Remove from list of root variables. */ |
| 1945 | if (rootlist == var->root) |
| 1946 | rootlist = var->root->next; |
| 1947 | else |
| 1948 | { |
| 1949 | prer = NULL; |
| 1950 | cr = rootlist; |
| 1951 | while ((cr != NULL) && (cr->rootvar != var)) |
| 1952 | { |
| 1953 | prer = cr; |
| 1954 | cr = cr->next; |
| 1955 | } |
| 1956 | if (cr == NULL) |
| 1957 | { |
| 1958 | warning (_("Assertion failed: Could not find " |
| 1959 | "varobj \"%s\" in root list"), |
| 1960 | var->obj_name.c_str ()); |
| 1961 | return; |
| 1962 | } |
| 1963 | if (prer == NULL) |
| 1964 | rootlist = NULL; |
| 1965 | else |
| 1966 | prer->next = cr->next; |
| 1967 | } |
| 1968 | } |
| 1969 | |
| 1970 | } |
| 1971 | |
| 1972 | /* Create and install a child of the parent of the given name. |
| 1973 | |
| 1974 | The created VAROBJ takes ownership of the allocated NAME. */ |
| 1975 | |
| 1976 | static struct varobj * |
| 1977 | create_child (struct varobj *parent, int index, std::string &name) |
| 1978 | { |
| 1979 | struct varobj_item item; |
| 1980 | |
| 1981 | std::swap (item.name, name); |
| 1982 | item.value = value_of_child (parent, index); |
| 1983 | |
| 1984 | return create_child_with_value (parent, index, &item); |
| 1985 | } |
| 1986 | |
| 1987 | static struct varobj * |
| 1988 | create_child_with_value (struct varobj *parent, int index, |
| 1989 | struct varobj_item *item) |
| 1990 | { |
| 1991 | struct varobj *child; |
| 1992 | |
| 1993 | child = new_variable (); |
| 1994 | |
| 1995 | /* NAME is allocated by caller. */ |
| 1996 | std::swap (child->name, item->name); |
| 1997 | child->index = index; |
| 1998 | child->parent = parent; |
| 1999 | child->root = parent->root; |
| 2000 | |
| 2001 | if (varobj_is_anonymous_child (child)) |
| 2002 | child->obj_name = string_printf ("%s.%d_anonymous", |
| 2003 | parent->obj_name.c_str (), index); |
| 2004 | else |
| 2005 | child->obj_name = string_printf ("%s.%s", |
| 2006 | parent->obj_name.c_str (), |
| 2007 | child->name.c_str ()); |
| 2008 | |
| 2009 | install_variable (child); |
| 2010 | |
| 2011 | /* Compute the type of the child. Must do this before |
| 2012 | calling install_new_value. */ |
| 2013 | if (item->value != NULL) |
| 2014 | /* If the child had no evaluation errors, var->value |
| 2015 | will be non-NULL and contain a valid type. */ |
| 2016 | child->type = value_actual_type (item->value, 0, NULL); |
| 2017 | else |
| 2018 | /* Otherwise, we must compute the type. */ |
| 2019 | child->type = (*child->root->lang_ops->type_of_child) (child->parent, |
| 2020 | child->index); |
| 2021 | install_new_value (child, item->value, 1); |
| 2022 | |
| 2023 | return child; |
| 2024 | } |
| 2025 | \f |
| 2026 | |
| 2027 | /* |
| 2028 | * Miscellaneous utility functions. |
| 2029 | */ |
| 2030 | |
| 2031 | /* Allocate memory and initialize a new variable. */ |
| 2032 | static struct varobj * |
| 2033 | new_variable (void) |
| 2034 | { |
| 2035 | struct varobj *var; |
| 2036 | |
| 2037 | var = new varobj (); |
| 2038 | var->index = -1; |
| 2039 | var->type = NULL; |
| 2040 | var->value = NULL; |
| 2041 | var->num_children = -1; |
| 2042 | var->parent = NULL; |
| 2043 | var->children = NULL; |
| 2044 | var->format = FORMAT_NATURAL; |
| 2045 | var->root = NULL; |
| 2046 | var->updated = 0; |
| 2047 | var->frozen = 0; |
| 2048 | var->not_fetched = 0; |
| 2049 | var->dynamic = XNEW (struct varobj_dynamic); |
| 2050 | var->dynamic->children_requested = 0; |
| 2051 | var->from = -1; |
| 2052 | var->to = -1; |
| 2053 | var->dynamic->constructor = 0; |
| 2054 | var->dynamic->pretty_printer = 0; |
| 2055 | var->dynamic->child_iter = 0; |
| 2056 | var->dynamic->saved_item = 0; |
| 2057 | |
| 2058 | return var; |
| 2059 | } |
| 2060 | |
| 2061 | /* Allocate memory and initialize a new root variable. */ |
| 2062 | static struct varobj * |
| 2063 | new_root_variable (void) |
| 2064 | { |
| 2065 | struct varobj *var = new_variable (); |
| 2066 | |
| 2067 | var->root = new varobj_root (); |
| 2068 | var->root->lang_ops = NULL; |
| 2069 | var->root->exp = NULL; |
| 2070 | var->root->valid_block = NULL; |
| 2071 | var->root->frame = null_frame_id; |
| 2072 | var->root->floating = 0; |
| 2073 | var->root->rootvar = NULL; |
| 2074 | var->root->is_valid = 1; |
| 2075 | |
| 2076 | return var; |
| 2077 | } |
| 2078 | |
| 2079 | /* Free any allocated memory associated with VAR. */ |
| 2080 | static void |
| 2081 | free_variable (struct varobj *var) |
| 2082 | { |
| 2083 | #if HAVE_PYTHON |
| 2084 | if (var->dynamic->pretty_printer != NULL) |
| 2085 | { |
| 2086 | gdbpy_enter_varobj enter_py (var); |
| 2087 | |
| 2088 | Py_XDECREF (var->dynamic->constructor); |
| 2089 | Py_XDECREF (var->dynamic->pretty_printer); |
| 2090 | } |
| 2091 | #endif |
| 2092 | |
| 2093 | varobj_iter_delete (var->dynamic->child_iter); |
| 2094 | varobj_clear_saved_item (var->dynamic); |
| 2095 | value_free (var->value); |
| 2096 | |
| 2097 | if (is_root_p (var)) |
| 2098 | delete var->root; |
| 2099 | |
| 2100 | xfree (var->dynamic); |
| 2101 | delete var; |
| 2102 | } |
| 2103 | |
| 2104 | static void |
| 2105 | do_free_variable_cleanup (void *var) |
| 2106 | { |
| 2107 | free_variable ((struct varobj *) var); |
| 2108 | } |
| 2109 | |
| 2110 | static struct cleanup * |
| 2111 | make_cleanup_free_variable (struct varobj *var) |
| 2112 | { |
| 2113 | return make_cleanup (do_free_variable_cleanup, var); |
| 2114 | } |
| 2115 | |
| 2116 | /* Return the type of the value that's stored in VAR, |
| 2117 | or that would have being stored there if the |
| 2118 | value were accessible. |
| 2119 | |
| 2120 | This differs from VAR->type in that VAR->type is always |
| 2121 | the true type of the expession in the source language. |
| 2122 | The return value of this function is the type we're |
| 2123 | actually storing in varobj, and using for displaying |
| 2124 | the values and for comparing previous and new values. |
| 2125 | |
| 2126 | For example, top-level references are always stripped. */ |
| 2127 | struct type * |
| 2128 | varobj_get_value_type (const struct varobj *var) |
| 2129 | { |
| 2130 | struct type *type; |
| 2131 | |
| 2132 | if (var->value) |
| 2133 | type = value_type (var->value); |
| 2134 | else |
| 2135 | type = var->type; |
| 2136 | |
| 2137 | type = check_typedef (type); |
| 2138 | |
| 2139 | if (TYPE_IS_REFERENCE (type)) |
| 2140 | type = get_target_type (type); |
| 2141 | |
| 2142 | type = check_typedef (type); |
| 2143 | |
| 2144 | return type; |
| 2145 | } |
| 2146 | |
| 2147 | /* What is the default display for this variable? We assume that |
| 2148 | everything is "natural". Any exceptions? */ |
| 2149 | static enum varobj_display_formats |
| 2150 | variable_default_display (struct varobj *var) |
| 2151 | { |
| 2152 | return FORMAT_NATURAL; |
| 2153 | } |
| 2154 | |
| 2155 | /* |
| 2156 | * Language-dependencies |
| 2157 | */ |
| 2158 | |
| 2159 | /* Common entry points */ |
| 2160 | |
| 2161 | /* Return the number of children for a given variable. |
| 2162 | The result of this function is defined by the language |
| 2163 | implementation. The number of children returned by this function |
| 2164 | is the number of children that the user will see in the variable |
| 2165 | display. */ |
| 2166 | static int |
| 2167 | number_of_children (const struct varobj *var) |
| 2168 | { |
| 2169 | return (*var->root->lang_ops->number_of_children) (var); |
| 2170 | } |
| 2171 | |
| 2172 | /* What is the expression for the root varobj VAR? */ |
| 2173 | |
| 2174 | static std::string |
| 2175 | name_of_variable (const struct varobj *var) |
| 2176 | { |
| 2177 | return (*var->root->lang_ops->name_of_variable) (var); |
| 2178 | } |
| 2179 | |
| 2180 | /* What is the name of the INDEX'th child of VAR? */ |
| 2181 | |
| 2182 | static std::string |
| 2183 | name_of_child (struct varobj *var, int index) |
| 2184 | { |
| 2185 | return (*var->root->lang_ops->name_of_child) (var, index); |
| 2186 | } |
| 2187 | |
| 2188 | /* If frame associated with VAR can be found, switch |
| 2189 | to it and return 1. Otherwise, return 0. */ |
| 2190 | |
| 2191 | static int |
| 2192 | check_scope (const struct varobj *var) |
| 2193 | { |
| 2194 | struct frame_info *fi; |
| 2195 | int scope; |
| 2196 | |
| 2197 | fi = frame_find_by_id (var->root->frame); |
| 2198 | scope = fi != NULL; |
| 2199 | |
| 2200 | if (fi) |
| 2201 | { |
| 2202 | CORE_ADDR pc = get_frame_pc (fi); |
| 2203 | |
| 2204 | if (pc < BLOCK_START (var->root->valid_block) || |
| 2205 | pc >= BLOCK_END (var->root->valid_block)) |
| 2206 | scope = 0; |
| 2207 | else |
| 2208 | select_frame (fi); |
| 2209 | } |
| 2210 | return scope; |
| 2211 | } |
| 2212 | |
| 2213 | /* Helper function to value_of_root. */ |
| 2214 | |
| 2215 | static struct value * |
| 2216 | value_of_root_1 (struct varobj **var_handle) |
| 2217 | { |
| 2218 | struct value *new_val = NULL; |
| 2219 | struct varobj *var = *var_handle; |
| 2220 | int within_scope = 0; |
| 2221 | struct cleanup *back_to; |
| 2222 | |
| 2223 | /* Only root variables can be updated... */ |
| 2224 | if (!is_root_p (var)) |
| 2225 | /* Not a root var. */ |
| 2226 | return NULL; |
| 2227 | |
| 2228 | back_to = make_cleanup_restore_current_thread (); |
| 2229 | |
| 2230 | /* Determine whether the variable is still around. */ |
| 2231 | if (var->root->valid_block == NULL || var->root->floating) |
| 2232 | within_scope = 1; |
| 2233 | else if (var->root->thread_id == 0) |
| 2234 | { |
| 2235 | /* The program was single-threaded when the variable object was |
| 2236 | created. Technically, it's possible that the program became |
| 2237 | multi-threaded since then, but we don't support such |
| 2238 | scenario yet. */ |
| 2239 | within_scope = check_scope (var); |
| 2240 | } |
| 2241 | else |
| 2242 | { |
| 2243 | ptid_t ptid = global_thread_id_to_ptid (var->root->thread_id); |
| 2244 | |
| 2245 | if (!ptid_equal (minus_one_ptid, ptid)) |
| 2246 | { |
| 2247 | switch_to_thread (ptid); |
| 2248 | within_scope = check_scope (var); |
| 2249 | } |
| 2250 | } |
| 2251 | |
| 2252 | if (within_scope) |
| 2253 | { |
| 2254 | |
| 2255 | /* We need to catch errors here, because if evaluate |
| 2256 | expression fails we want to just return NULL. */ |
| 2257 | TRY |
| 2258 | { |
| 2259 | new_val = evaluate_expression (var->root->exp.get ()); |
| 2260 | } |
| 2261 | CATCH (except, RETURN_MASK_ERROR) |
| 2262 | { |
| 2263 | } |
| 2264 | END_CATCH |
| 2265 | } |
| 2266 | |
| 2267 | do_cleanups (back_to); |
| 2268 | |
| 2269 | return new_val; |
| 2270 | } |
| 2271 | |
| 2272 | /* What is the ``struct value *'' of the root variable VAR? |
| 2273 | For floating variable object, evaluation can get us a value |
| 2274 | of different type from what is stored in varobj already. In |
| 2275 | that case: |
| 2276 | - *type_changed will be set to 1 |
| 2277 | - old varobj will be freed, and new one will be |
| 2278 | created, with the same name. |
| 2279 | - *var_handle will be set to the new varobj |
| 2280 | Otherwise, *type_changed will be set to 0. */ |
| 2281 | static struct value * |
| 2282 | value_of_root (struct varobj **var_handle, int *type_changed) |
| 2283 | { |
| 2284 | struct varobj *var; |
| 2285 | |
| 2286 | if (var_handle == NULL) |
| 2287 | return NULL; |
| 2288 | |
| 2289 | var = *var_handle; |
| 2290 | |
| 2291 | /* This should really be an exception, since this should |
| 2292 | only get called with a root variable. */ |
| 2293 | |
| 2294 | if (!is_root_p (var)) |
| 2295 | return NULL; |
| 2296 | |
| 2297 | if (var->root->floating) |
| 2298 | { |
| 2299 | struct varobj *tmp_var; |
| 2300 | |
| 2301 | tmp_var = varobj_create (NULL, var->name.c_str (), (CORE_ADDR) 0, |
| 2302 | USE_SELECTED_FRAME); |
| 2303 | if (tmp_var == NULL) |
| 2304 | { |
| 2305 | return NULL; |
| 2306 | } |
| 2307 | std::string old_type = varobj_get_type (var); |
| 2308 | std::string new_type = varobj_get_type (tmp_var); |
| 2309 | if (old_type == new_type) |
| 2310 | { |
| 2311 | /* The expression presently stored inside var->root->exp |
| 2312 | remembers the locations of local variables relatively to |
| 2313 | the frame where the expression was created (in DWARF location |
| 2314 | button, for example). Naturally, those locations are not |
| 2315 | correct in other frames, so update the expression. */ |
| 2316 | |
| 2317 | std::swap (var->root->exp, tmp_var->root->exp); |
| 2318 | |
| 2319 | varobj_delete (tmp_var, 0); |
| 2320 | *type_changed = 0; |
| 2321 | } |
| 2322 | else |
| 2323 | { |
| 2324 | tmp_var->obj_name = var->obj_name; |
| 2325 | tmp_var->from = var->from; |
| 2326 | tmp_var->to = var->to; |
| 2327 | varobj_delete (var, 0); |
| 2328 | |
| 2329 | install_variable (tmp_var); |
| 2330 | *var_handle = tmp_var; |
| 2331 | var = *var_handle; |
| 2332 | *type_changed = 1; |
| 2333 | } |
| 2334 | } |
| 2335 | else |
| 2336 | { |
| 2337 | *type_changed = 0; |
| 2338 | } |
| 2339 | |
| 2340 | { |
| 2341 | struct value *value; |
| 2342 | |
| 2343 | value = value_of_root_1 (var_handle); |
| 2344 | if (var->value == NULL || value == NULL) |
| 2345 | { |
| 2346 | /* For root varobj-s, a NULL value indicates a scoping issue. |
| 2347 | So, nothing to do in terms of checking for mutations. */ |
| 2348 | } |
| 2349 | else if (varobj_value_has_mutated (var, value, value_type (value))) |
| 2350 | { |
| 2351 | /* The type has mutated, so the children are no longer valid. |
| 2352 | Just delete them, and tell our caller that the type has |
| 2353 | changed. */ |
| 2354 | varobj_delete (var, 1 /* only_children */); |
| 2355 | var->num_children = -1; |
| 2356 | var->to = -1; |
| 2357 | var->from = -1; |
| 2358 | *type_changed = 1; |
| 2359 | } |
| 2360 | return value; |
| 2361 | } |
| 2362 | } |
| 2363 | |
| 2364 | /* What is the ``struct value *'' for the INDEX'th child of PARENT? */ |
| 2365 | static struct value * |
| 2366 | value_of_child (const struct varobj *parent, int index) |
| 2367 | { |
| 2368 | struct value *value; |
| 2369 | |
| 2370 | value = (*parent->root->lang_ops->value_of_child) (parent, index); |
| 2371 | |
| 2372 | return value; |
| 2373 | } |
| 2374 | |
| 2375 | /* GDB already has a command called "value_of_variable". Sigh. */ |
| 2376 | static std::string |
| 2377 | my_value_of_variable (struct varobj *var, enum varobj_display_formats format) |
| 2378 | { |
| 2379 | if (var->root->is_valid) |
| 2380 | { |
| 2381 | if (var->dynamic->pretty_printer != NULL) |
| 2382 | return varobj_value_get_print_value (var->value, var->format, var); |
| 2383 | return (*var->root->lang_ops->value_of_variable) (var, format); |
| 2384 | } |
| 2385 | else |
| 2386 | return std::string (); |
| 2387 | } |
| 2388 | |
| 2389 | void |
| 2390 | varobj_formatted_print_options (struct value_print_options *opts, |
| 2391 | enum varobj_display_formats format) |
| 2392 | { |
| 2393 | get_formatted_print_options (opts, format_code[(int) format]); |
| 2394 | opts->deref_ref = 0; |
| 2395 | opts->raw = 1; |
| 2396 | } |
| 2397 | |
| 2398 | std::string |
| 2399 | varobj_value_get_print_value (struct value *value, |
| 2400 | enum varobj_display_formats format, |
| 2401 | const struct varobj *var) |
| 2402 | { |
| 2403 | struct value_print_options opts; |
| 2404 | struct type *type = NULL; |
| 2405 | long len = 0; |
| 2406 | gdb::unique_xmalloc_ptr<char> encoding; |
| 2407 | /* Initialize it just to avoid a GCC false warning. */ |
| 2408 | CORE_ADDR str_addr = 0; |
| 2409 | int string_print = 0; |
| 2410 | |
| 2411 | if (value == NULL) |
| 2412 | return std::string (); |
| 2413 | |
| 2414 | string_file stb; |
| 2415 | std::string thevalue; |
| 2416 | |
| 2417 | #if HAVE_PYTHON |
| 2418 | if (gdb_python_initialized) |
| 2419 | { |
| 2420 | PyObject *value_formatter = var->dynamic->pretty_printer; |
| 2421 | |
| 2422 | gdbpy_enter_varobj enter_py (var); |
| 2423 | |
| 2424 | if (value_formatter) |
| 2425 | { |
| 2426 | /* First check to see if we have any children at all. If so, |
| 2427 | we simply return {...}. */ |
| 2428 | if (dynamic_varobj_has_child_method (var)) |
| 2429 | return "{...}"; |
| 2430 | |
| 2431 | if (PyObject_HasAttr (value_formatter, gdbpy_to_string_cst)) |
| 2432 | { |
| 2433 | struct value *replacement; |
| 2434 | |
| 2435 | gdbpy_ref<> output (apply_varobj_pretty_printer (value_formatter, |
| 2436 | &replacement, |
| 2437 | &stb)); |
| 2438 | |
| 2439 | /* If we have string like output ... */ |
| 2440 | if (output != NULL) |
| 2441 | { |
| 2442 | /* If this is a lazy string, extract it. For lazy |
| 2443 | strings we always print as a string, so set |
| 2444 | string_print. */ |
| 2445 | if (gdbpy_is_lazy_string (output.get ())) |
| 2446 | { |
| 2447 | gdbpy_extract_lazy_string (output.get (), &str_addr, |
| 2448 | &type, &len, &encoding); |
| 2449 | string_print = 1; |
| 2450 | } |
| 2451 | else |
| 2452 | { |
| 2453 | /* If it is a regular (non-lazy) string, extract |
| 2454 | it and copy the contents into THEVALUE. If the |
| 2455 | hint says to print it as a string, set |
| 2456 | string_print. Otherwise just return the extracted |
| 2457 | string as a value. */ |
| 2458 | |
| 2459 | gdb::unique_xmalloc_ptr<char> s |
| 2460 | = python_string_to_target_string (output.get ()); |
| 2461 | |
| 2462 | if (s) |
| 2463 | { |
| 2464 | struct gdbarch *gdbarch; |
| 2465 | |
| 2466 | gdb::unique_xmalloc_ptr<char> hint |
| 2467 | = gdbpy_get_display_hint (value_formatter); |
| 2468 | if (hint) |
| 2469 | { |
| 2470 | if (!strcmp (hint.get (), "string")) |
| 2471 | string_print = 1; |
| 2472 | } |
| 2473 | |
| 2474 | thevalue = std::string (s.get ()); |
| 2475 | len = thevalue.size (); |
| 2476 | gdbarch = get_type_arch (value_type (value)); |
| 2477 | type = builtin_type (gdbarch)->builtin_char; |
| 2478 | |
| 2479 | if (!string_print) |
| 2480 | return thevalue; |
| 2481 | } |
| 2482 | else |
| 2483 | gdbpy_print_stack (); |
| 2484 | } |
| 2485 | } |
| 2486 | /* If the printer returned a replacement value, set VALUE |
| 2487 | to REPLACEMENT. If there is not a replacement value, |
| 2488 | just use the value passed to this function. */ |
| 2489 | if (replacement) |
| 2490 | value = replacement; |
| 2491 | } |
| 2492 | } |
| 2493 | } |
| 2494 | #endif |
| 2495 | |
| 2496 | varobj_formatted_print_options (&opts, format); |
| 2497 | |
| 2498 | /* If the THEVALUE has contents, it is a regular string. */ |
| 2499 | if (!thevalue.empty ()) |
| 2500 | LA_PRINT_STRING (&stb, type, (gdb_byte *) thevalue.c_str (), |
| 2501 | len, encoding.get (), 0, &opts); |
| 2502 | else if (string_print) |
| 2503 | /* Otherwise, if string_print is set, and it is not a regular |
| 2504 | string, it is a lazy string. */ |
| 2505 | val_print_string (type, encoding.get (), str_addr, len, &stb, &opts); |
| 2506 | else |
| 2507 | /* All other cases. */ |
| 2508 | common_val_print (value, &stb, 0, &opts, current_language); |
| 2509 | |
| 2510 | return std::move (stb.string ()); |
| 2511 | } |
| 2512 | |
| 2513 | int |
| 2514 | varobj_editable_p (const struct varobj *var) |
| 2515 | { |
| 2516 | struct type *type; |
| 2517 | |
| 2518 | if (!(var->root->is_valid && var->value && VALUE_LVAL (var->value))) |
| 2519 | return 0; |
| 2520 | |
| 2521 | type = varobj_get_value_type (var); |
| 2522 | |
| 2523 | switch (TYPE_CODE (type)) |
| 2524 | { |
| 2525 | case TYPE_CODE_STRUCT: |
| 2526 | case TYPE_CODE_UNION: |
| 2527 | case TYPE_CODE_ARRAY: |
| 2528 | case TYPE_CODE_FUNC: |
| 2529 | case TYPE_CODE_METHOD: |
| 2530 | return 0; |
| 2531 | break; |
| 2532 | |
| 2533 | default: |
| 2534 | return 1; |
| 2535 | break; |
| 2536 | } |
| 2537 | } |
| 2538 | |
| 2539 | /* Call VAR's value_is_changeable_p language-specific callback. */ |
| 2540 | |
| 2541 | int |
| 2542 | varobj_value_is_changeable_p (const struct varobj *var) |
| 2543 | { |
| 2544 | return var->root->lang_ops->value_is_changeable_p (var); |
| 2545 | } |
| 2546 | |
| 2547 | /* Return 1 if that varobj is floating, that is is always evaluated in the |
| 2548 | selected frame, and not bound to thread/frame. Such variable objects |
| 2549 | are created using '@' as frame specifier to -var-create. */ |
| 2550 | int |
| 2551 | varobj_floating_p (const struct varobj *var) |
| 2552 | { |
| 2553 | return var->root->floating; |
| 2554 | } |
| 2555 | |
| 2556 | /* Implement the "value_is_changeable_p" varobj callback for most |
| 2557 | languages. */ |
| 2558 | |
| 2559 | int |
| 2560 | varobj_default_value_is_changeable_p (const struct varobj *var) |
| 2561 | { |
| 2562 | int r; |
| 2563 | struct type *type; |
| 2564 | |
| 2565 | if (CPLUS_FAKE_CHILD (var)) |
| 2566 | return 0; |
| 2567 | |
| 2568 | type = varobj_get_value_type (var); |
| 2569 | |
| 2570 | switch (TYPE_CODE (type)) |
| 2571 | { |
| 2572 | case TYPE_CODE_STRUCT: |
| 2573 | case TYPE_CODE_UNION: |
| 2574 | case TYPE_CODE_ARRAY: |
| 2575 | r = 0; |
| 2576 | break; |
| 2577 | |
| 2578 | default: |
| 2579 | r = 1; |
| 2580 | } |
| 2581 | |
| 2582 | return r; |
| 2583 | } |
| 2584 | |
| 2585 | /* Iterate all the existing _root_ VAROBJs and call the FUNC callback for them |
| 2586 | with an arbitrary caller supplied DATA pointer. */ |
| 2587 | |
| 2588 | void |
| 2589 | all_root_varobjs (void (*func) (struct varobj *var, void *data), void *data) |
| 2590 | { |
| 2591 | struct varobj_root *var_root, *var_root_next; |
| 2592 | |
| 2593 | /* Iterate "safely" - handle if the callee deletes its passed VAROBJ. */ |
| 2594 | |
| 2595 | for (var_root = rootlist; var_root != NULL; var_root = var_root_next) |
| 2596 | { |
| 2597 | var_root_next = var_root->next; |
| 2598 | |
| 2599 | (*func) (var_root->rootvar, data); |
| 2600 | } |
| 2601 | } |
| 2602 | |
| 2603 | /* Invalidate varobj VAR if it is tied to locals and re-create it if it is |
| 2604 | defined on globals. It is a helper for varobj_invalidate. |
| 2605 | |
| 2606 | This function is called after changing the symbol file, in this case the |
| 2607 | pointers to "struct type" stored by the varobj are no longer valid. All |
| 2608 | varobj must be either re-evaluated, or marked as invalid here. */ |
| 2609 | |
| 2610 | static void |
| 2611 | varobj_invalidate_iter (struct varobj *var, void *unused) |
| 2612 | { |
| 2613 | /* global and floating var must be re-evaluated. */ |
| 2614 | if (var->root->floating || var->root->valid_block == NULL) |
| 2615 | { |
| 2616 | struct varobj *tmp_var; |
| 2617 | |
| 2618 | /* Try to create a varobj with same expression. If we succeed |
| 2619 | replace the old varobj, otherwise invalidate it. */ |
| 2620 | tmp_var = varobj_create (NULL, var->name.c_str (), (CORE_ADDR) 0, |
| 2621 | USE_CURRENT_FRAME); |
| 2622 | if (tmp_var != NULL) |
| 2623 | { |
| 2624 | tmp_var->obj_name = var->obj_name; |
| 2625 | varobj_delete (var, 0); |
| 2626 | install_variable (tmp_var); |
| 2627 | } |
| 2628 | else |
| 2629 | var->root->is_valid = 0; |
| 2630 | } |
| 2631 | else /* locals must be invalidated. */ |
| 2632 | var->root->is_valid = 0; |
| 2633 | } |
| 2634 | |
| 2635 | /* Invalidate the varobjs that are tied to locals and re-create the ones that |
| 2636 | are defined on globals. |
| 2637 | Invalidated varobjs will be always printed in_scope="invalid". */ |
| 2638 | |
| 2639 | void |
| 2640 | varobj_invalidate (void) |
| 2641 | { |
| 2642 | all_root_varobjs (varobj_invalidate_iter, NULL); |
| 2643 | } |
| 2644 | \f |
| 2645 | extern void _initialize_varobj (void); |
| 2646 | void |
| 2647 | _initialize_varobj (void) |
| 2648 | { |
| 2649 | varobj_table = XCNEWVEC (struct vlist *, VAROBJ_TABLE_SIZE); |
| 2650 | |
| 2651 | add_setshow_zuinteger_cmd ("varobj", class_maintenance, |
| 2652 | &varobjdebug, |
| 2653 | _("Set varobj debugging."), |
| 2654 | _("Show varobj debugging."), |
| 2655 | _("When non-zero, varobj debugging is enabled."), |
| 2656 | NULL, show_varobjdebug, |
| 2657 | &setdebuglist, &showdebuglist); |
| 2658 | } |