| 1 | /* varobj support for C and C++. |
| 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 "varobj.h" |
| 21 | #include "gdbthread.h" |
| 22 | #include "valprint.h" |
| 23 | |
| 24 | static void cplus_class_num_children (struct type *type, int children[3]); |
| 25 | |
| 26 | /* The names of varobjs representing anonymous structs or unions. */ |
| 27 | #define ANONYMOUS_STRUCT_NAME _("<anonymous struct>") |
| 28 | #define ANONYMOUS_UNION_NAME _("<anonymous union>") |
| 29 | |
| 30 | /* Does CHILD represent a child with no name? This happens when |
| 31 | the child is an anonmous struct or union and it has no field name |
| 32 | in its parent variable. |
| 33 | |
| 34 | This has already been determined by *_describe_child. The easiest |
| 35 | thing to do is to compare the child's name with ANONYMOUS_*_NAME. */ |
| 36 | |
| 37 | int |
| 38 | varobj_is_anonymous_child (const struct varobj *child) |
| 39 | { |
| 40 | return (child->name == ANONYMOUS_STRUCT_NAME |
| 41 | || child->name == ANONYMOUS_UNION_NAME); |
| 42 | } |
| 43 | |
| 44 | /* Given the value and the type of a variable object, |
| 45 | adjust the value and type to those necessary |
| 46 | for getting children of the variable object. |
| 47 | This includes dereferencing top-level references |
| 48 | to all types and dereferencing pointers to |
| 49 | structures. |
| 50 | |
| 51 | If LOOKUP_ACTUAL_TYPE is set the enclosing type of the |
| 52 | value will be fetched and if it differs from static type |
| 53 | the value will be casted to it. |
| 54 | |
| 55 | Both TYPE and *TYPE should be non-null. VALUE |
| 56 | can be null if we want to only translate type. |
| 57 | *VALUE can be null as well -- if the parent |
| 58 | value is not known. |
| 59 | |
| 60 | If WAS_PTR is not NULL, set *WAS_PTR to 0 or 1 |
| 61 | depending on whether pointer was dereferenced |
| 62 | in this function. */ |
| 63 | |
| 64 | static void |
| 65 | adjust_value_for_child_access (struct value **value, |
| 66 | struct type **type, |
| 67 | int *was_ptr, |
| 68 | int lookup_actual_type) |
| 69 | { |
| 70 | gdb_assert (type && *type); |
| 71 | |
| 72 | if (was_ptr) |
| 73 | *was_ptr = 0; |
| 74 | |
| 75 | *type = check_typedef (*type); |
| 76 | |
| 77 | /* The type of value stored in varobj, that is passed |
| 78 | to us, is already supposed to be |
| 79 | reference-stripped. */ |
| 80 | |
| 81 | gdb_assert (!TYPE_IS_REFERENCE (*type)); |
| 82 | |
| 83 | /* Pointers to structures are treated just like |
| 84 | structures when accessing children. Don't |
| 85 | dererences pointers to other types. */ |
| 86 | if (TYPE_CODE (*type) == TYPE_CODE_PTR) |
| 87 | { |
| 88 | struct type *target_type = get_target_type (*type); |
| 89 | if (TYPE_CODE (target_type) == TYPE_CODE_STRUCT |
| 90 | || TYPE_CODE (target_type) == TYPE_CODE_UNION) |
| 91 | { |
| 92 | if (value && *value) |
| 93 | { |
| 94 | |
| 95 | TRY |
| 96 | { |
| 97 | *value = value_ind (*value); |
| 98 | } |
| 99 | |
| 100 | CATCH (except, RETURN_MASK_ERROR) |
| 101 | { |
| 102 | *value = NULL; |
| 103 | } |
| 104 | END_CATCH |
| 105 | } |
| 106 | *type = target_type; |
| 107 | if (was_ptr) |
| 108 | *was_ptr = 1; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /* The 'get_target_type' function calls check_typedef on |
| 113 | result, so we can immediately check type code. No |
| 114 | need to call check_typedef here. */ |
| 115 | |
| 116 | /* Access a real type of the value (if necessary and possible). */ |
| 117 | if (value && *value && lookup_actual_type) |
| 118 | { |
| 119 | struct type *enclosing_type; |
| 120 | int real_type_found = 0; |
| 121 | |
| 122 | enclosing_type = value_actual_type (*value, 1, &real_type_found); |
| 123 | if (real_type_found) |
| 124 | { |
| 125 | *type = enclosing_type; |
| 126 | *value = value_cast (enclosing_type, *value); |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | /* Is VAR a path expression parent, i.e., can it be used to construct |
| 132 | a valid path expression? */ |
| 133 | |
| 134 | static int |
| 135 | c_is_path_expr_parent (const struct varobj *var) |
| 136 | { |
| 137 | struct type *type; |
| 138 | |
| 139 | /* "Fake" children are not path_expr parents. */ |
| 140 | if (CPLUS_FAKE_CHILD (var)) |
| 141 | return 0; |
| 142 | |
| 143 | type = varobj_get_gdb_type (var); |
| 144 | |
| 145 | /* Anonymous unions and structs are also not path_expr parents. */ |
| 146 | if ((TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 147 | || TYPE_CODE (type) == TYPE_CODE_UNION) |
| 148 | && TYPE_NAME (type) == NULL |
| 149 | && TYPE_TAG_NAME (type) == NULL) |
| 150 | { |
| 151 | const struct varobj *parent = var->parent; |
| 152 | |
| 153 | while (parent != NULL && CPLUS_FAKE_CHILD (parent)) |
| 154 | parent = parent->parent; |
| 155 | |
| 156 | if (parent != NULL) |
| 157 | { |
| 158 | struct type *parent_type; |
| 159 | int was_ptr; |
| 160 | |
| 161 | parent_type = varobj_get_value_type (parent); |
| 162 | adjust_value_for_child_access (NULL, &parent_type, &was_ptr, 0); |
| 163 | |
| 164 | if (TYPE_CODE (parent_type) == TYPE_CODE_STRUCT |
| 165 | || TYPE_CODE (parent_type) == TYPE_CODE_UNION) |
| 166 | { |
| 167 | const char *field_name; |
| 168 | |
| 169 | gdb_assert (var->index < TYPE_NFIELDS (parent_type)); |
| 170 | field_name = TYPE_FIELD_NAME (parent_type, var->index); |
| 171 | return !(field_name == NULL || *field_name == '\0'); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | return 1; |
| 179 | } |
| 180 | |
| 181 | /* C */ |
| 182 | |
| 183 | static int |
| 184 | c_number_of_children (const struct varobj *var) |
| 185 | { |
| 186 | struct type *type = varobj_get_value_type (var); |
| 187 | int children = 0; |
| 188 | struct type *target; |
| 189 | |
| 190 | adjust_value_for_child_access (NULL, &type, NULL, 0); |
| 191 | target = get_target_type (type); |
| 192 | |
| 193 | switch (TYPE_CODE (type)) |
| 194 | { |
| 195 | case TYPE_CODE_ARRAY: |
| 196 | if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (target) > 0 |
| 197 | && !TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type)) |
| 198 | children = TYPE_LENGTH (type) / TYPE_LENGTH (target); |
| 199 | else |
| 200 | /* If we don't know how many elements there are, don't display |
| 201 | any. */ |
| 202 | children = 0; |
| 203 | break; |
| 204 | |
| 205 | case TYPE_CODE_STRUCT: |
| 206 | case TYPE_CODE_UNION: |
| 207 | children = TYPE_NFIELDS (type); |
| 208 | break; |
| 209 | |
| 210 | case TYPE_CODE_PTR: |
| 211 | /* The type here is a pointer to non-struct. Typically, pointers |
| 212 | have one child, except for function ptrs, which have no children, |
| 213 | and except for void*, as we don't know what to show. |
| 214 | |
| 215 | We can show char* so we allow it to be dereferenced. If you decide |
| 216 | to test for it, please mind that a little magic is necessary to |
| 217 | properly identify it: char* has TYPE_CODE == TYPE_CODE_INT and |
| 218 | TYPE_NAME == "char". */ |
| 219 | if (TYPE_CODE (target) == TYPE_CODE_FUNC |
| 220 | || TYPE_CODE (target) == TYPE_CODE_VOID) |
| 221 | children = 0; |
| 222 | else |
| 223 | children = 1; |
| 224 | break; |
| 225 | |
| 226 | default: |
| 227 | /* Other types have no children. */ |
| 228 | break; |
| 229 | } |
| 230 | |
| 231 | return children; |
| 232 | } |
| 233 | |
| 234 | static std::string |
| 235 | c_name_of_variable (const struct varobj *parent) |
| 236 | { |
| 237 | return parent->name; |
| 238 | } |
| 239 | |
| 240 | /* Return the value of element TYPE_INDEX of a structure |
| 241 | value VALUE. VALUE's type should be a structure, |
| 242 | or union, or a typedef to struct/union. |
| 243 | |
| 244 | Returns NULL if getting the value fails. Never throws. */ |
| 245 | |
| 246 | static struct value * |
| 247 | value_struct_element_index (struct value *value, int type_index) |
| 248 | { |
| 249 | struct value *result = NULL; |
| 250 | struct type *type = value_type (value); |
| 251 | |
| 252 | type = check_typedef (type); |
| 253 | |
| 254 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 255 | || TYPE_CODE (type) == TYPE_CODE_UNION); |
| 256 | |
| 257 | TRY |
| 258 | { |
| 259 | if (field_is_static (&TYPE_FIELD (type, type_index))) |
| 260 | result = value_static_field (type, type_index); |
| 261 | else |
| 262 | result = value_primitive_field (value, 0, type_index, type); |
| 263 | } |
| 264 | CATCH (e, RETURN_MASK_ERROR) |
| 265 | { |
| 266 | return NULL; |
| 267 | } |
| 268 | END_CATCH |
| 269 | |
| 270 | return result; |
| 271 | } |
| 272 | |
| 273 | /* Obtain the information about child INDEX of the variable |
| 274 | object PARENT. |
| 275 | If CNAME is not null, sets *CNAME to the name of the child relative |
| 276 | to the parent. |
| 277 | If CVALUE is not null, sets *CVALUE to the value of the child. |
| 278 | If CTYPE is not null, sets *CTYPE to the type of the child. |
| 279 | |
| 280 | If any of CNAME, CVALUE, or CTYPE is not null, but the corresponding |
| 281 | information cannot be determined, set *CNAME, *CVALUE, or *CTYPE |
| 282 | to empty. */ |
| 283 | |
| 284 | static void |
| 285 | c_describe_child (const struct varobj *parent, int index, |
| 286 | std::string *cname, struct value **cvalue, |
| 287 | struct type **ctype, std::string *cfull_expression) |
| 288 | { |
| 289 | struct value *value = parent->value; |
| 290 | struct type *type = varobj_get_value_type (parent); |
| 291 | std::string parent_expression; |
| 292 | int was_ptr; |
| 293 | |
| 294 | if (cname) |
| 295 | *cname = std::string (); |
| 296 | if (cvalue) |
| 297 | *cvalue = NULL; |
| 298 | if (ctype) |
| 299 | *ctype = NULL; |
| 300 | if (cfull_expression) |
| 301 | { |
| 302 | *cfull_expression = std::string (); |
| 303 | parent_expression |
| 304 | = varobj_get_path_expr (varobj_get_path_expr_parent (parent)); |
| 305 | } |
| 306 | adjust_value_for_child_access (&value, &type, &was_ptr, 0); |
| 307 | |
| 308 | switch (TYPE_CODE (type)) |
| 309 | { |
| 310 | case TYPE_CODE_ARRAY: |
| 311 | if (cname) |
| 312 | *cname = int_string (index |
| 313 | + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)), |
| 314 | 10, 1, 0, 0); |
| 315 | |
| 316 | if (cvalue && value) |
| 317 | { |
| 318 | int real_index = index + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)); |
| 319 | |
| 320 | TRY |
| 321 | { |
| 322 | *cvalue = value_subscript (value, real_index); |
| 323 | } |
| 324 | CATCH (except, RETURN_MASK_ERROR) |
| 325 | { |
| 326 | } |
| 327 | END_CATCH |
| 328 | } |
| 329 | |
| 330 | if (ctype) |
| 331 | *ctype = get_target_type (type); |
| 332 | |
| 333 | if (cfull_expression) |
| 334 | *cfull_expression = |
| 335 | string_printf ("(%s)[%s]", parent_expression.c_str (), |
| 336 | int_string (index |
| 337 | + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)), |
| 338 | 10, 1, 0, 0)); |
| 339 | |
| 340 | |
| 341 | break; |
| 342 | |
| 343 | case TYPE_CODE_STRUCT: |
| 344 | case TYPE_CODE_UNION: |
| 345 | { |
| 346 | const char *field_name; |
| 347 | |
| 348 | /* If the type is anonymous and the field has no name, |
| 349 | set an appropriate name. */ |
| 350 | field_name = TYPE_FIELD_NAME (type, index); |
| 351 | if (field_name == NULL || *field_name == '\0') |
| 352 | { |
| 353 | if (cname) |
| 354 | { |
| 355 | if (TYPE_CODE (TYPE_FIELD_TYPE (type, index)) |
| 356 | == TYPE_CODE_STRUCT) |
| 357 | *cname = ANONYMOUS_STRUCT_NAME; |
| 358 | else |
| 359 | *cname = ANONYMOUS_UNION_NAME; |
| 360 | } |
| 361 | |
| 362 | if (cfull_expression) |
| 363 | *cfull_expression = ""; |
| 364 | } |
| 365 | else |
| 366 | { |
| 367 | if (cname) |
| 368 | *cname = field_name; |
| 369 | |
| 370 | if (cfull_expression) |
| 371 | { |
| 372 | const char *join = was_ptr ? "->" : "."; |
| 373 | |
| 374 | *cfull_expression = string_printf ("(%s)%s%s", |
| 375 | parent_expression.c_str (), |
| 376 | join, field_name); |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | if (cvalue && value) |
| 381 | { |
| 382 | /* For C, varobj index is the same as type index. */ |
| 383 | *cvalue = value_struct_element_index (value, index); |
| 384 | } |
| 385 | |
| 386 | if (ctype) |
| 387 | *ctype = TYPE_FIELD_TYPE (type, index); |
| 388 | } |
| 389 | break; |
| 390 | |
| 391 | case TYPE_CODE_PTR: |
| 392 | if (cname) |
| 393 | *cname = string_printf ("*%s", parent->name.c_str ()); |
| 394 | |
| 395 | if (cvalue && value) |
| 396 | { |
| 397 | TRY |
| 398 | { |
| 399 | *cvalue = value_ind (value); |
| 400 | } |
| 401 | |
| 402 | CATCH (except, RETURN_MASK_ERROR) |
| 403 | { |
| 404 | *cvalue = NULL; |
| 405 | } |
| 406 | END_CATCH |
| 407 | } |
| 408 | |
| 409 | /* Don't use get_target_type because it calls |
| 410 | check_typedef and here, we want to show the true |
| 411 | declared type of the variable. */ |
| 412 | if (ctype) |
| 413 | *ctype = TYPE_TARGET_TYPE (type); |
| 414 | |
| 415 | if (cfull_expression) |
| 416 | *cfull_expression = string_printf ("*(%s)", parent_expression.c_str ()); |
| 417 | break; |
| 418 | |
| 419 | default: |
| 420 | /* This should not happen. */ |
| 421 | if (cname) |
| 422 | *cname = "???"; |
| 423 | if (cfull_expression) |
| 424 | *cfull_expression = "???"; |
| 425 | /* Don't set value and type, we don't know then. */ |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | static std::string |
| 430 | c_name_of_child (const struct varobj *parent, int index) |
| 431 | { |
| 432 | std::string name; |
| 433 | |
| 434 | c_describe_child (parent, index, &name, NULL, NULL, NULL); |
| 435 | return name; |
| 436 | } |
| 437 | |
| 438 | static std::string |
| 439 | c_path_expr_of_child (const struct varobj *child) |
| 440 | { |
| 441 | std::string path_expr; |
| 442 | |
| 443 | c_describe_child (child->parent, child->index, NULL, NULL, NULL, |
| 444 | &path_expr); |
| 445 | return path_expr; |
| 446 | } |
| 447 | |
| 448 | static struct value * |
| 449 | c_value_of_child (const struct varobj *parent, int index) |
| 450 | { |
| 451 | struct value *value = NULL; |
| 452 | |
| 453 | c_describe_child (parent, index, NULL, &value, NULL, NULL); |
| 454 | return value; |
| 455 | } |
| 456 | |
| 457 | static struct type * |
| 458 | c_type_of_child (const struct varobj *parent, int index) |
| 459 | { |
| 460 | struct type *type = NULL; |
| 461 | |
| 462 | c_describe_child (parent, index, NULL, NULL, &type, NULL); |
| 463 | return type; |
| 464 | } |
| 465 | |
| 466 | /* This returns the type of the variable. It also skips past typedefs |
| 467 | to return the real type of the variable. */ |
| 468 | |
| 469 | static struct type * |
| 470 | get_type (const struct varobj *var) |
| 471 | { |
| 472 | struct type *type; |
| 473 | |
| 474 | type = var->type; |
| 475 | if (type != NULL) |
| 476 | type = check_typedef (type); |
| 477 | |
| 478 | return type; |
| 479 | } |
| 480 | |
| 481 | static std::string |
| 482 | c_value_of_variable (const struct varobj *var, |
| 483 | enum varobj_display_formats format) |
| 484 | { |
| 485 | /* BOGUS: if val_print sees a struct/class, or a reference to one, |
| 486 | it will print out its children instead of "{...}". So we need to |
| 487 | catch that case explicitly. */ |
| 488 | struct type *type = get_type (var); |
| 489 | |
| 490 | /* Strip top-level references. */ |
| 491 | while (TYPE_IS_REFERENCE (type)) |
| 492 | type = check_typedef (TYPE_TARGET_TYPE (type)); |
| 493 | |
| 494 | switch (TYPE_CODE (type)) |
| 495 | { |
| 496 | case TYPE_CODE_STRUCT: |
| 497 | case TYPE_CODE_UNION: |
| 498 | return "{...}"; |
| 499 | /* break; */ |
| 500 | |
| 501 | case TYPE_CODE_ARRAY: |
| 502 | return string_printf ("[%d]", var->num_children); |
| 503 | /* break; */ |
| 504 | |
| 505 | default: |
| 506 | { |
| 507 | if (var->value == NULL) |
| 508 | { |
| 509 | /* This can happen if we attempt to get the value of a struct |
| 510 | member when the parent is an invalid pointer. This is an |
| 511 | error condition, so we should tell the caller. */ |
| 512 | return std::string (); |
| 513 | } |
| 514 | else |
| 515 | { |
| 516 | if (var->not_fetched && value_lazy (var->value)) |
| 517 | /* Frozen variable and no value yet. We don't |
| 518 | implicitly fetch the value. MI response will |
| 519 | use empty string for the value, which is OK. */ |
| 520 | return std::string (); |
| 521 | |
| 522 | gdb_assert (varobj_value_is_changeable_p (var)); |
| 523 | gdb_assert (!value_lazy (var->value)); |
| 524 | |
| 525 | /* If the specified format is the current one, |
| 526 | we can reuse print_value. */ |
| 527 | if (format == var->format) |
| 528 | return var->print_value; |
| 529 | else |
| 530 | return varobj_value_get_print_value (var->value, format, var); |
| 531 | } |
| 532 | } |
| 533 | } |
| 534 | } |
| 535 | \f |
| 536 | |
| 537 | /* varobj operations for c. */ |
| 538 | |
| 539 | const struct lang_varobj_ops c_varobj_ops = |
| 540 | { |
| 541 | c_number_of_children, |
| 542 | c_name_of_variable, |
| 543 | c_name_of_child, |
| 544 | c_path_expr_of_child, |
| 545 | c_value_of_child, |
| 546 | c_type_of_child, |
| 547 | c_value_of_variable, |
| 548 | varobj_default_value_is_changeable_p, |
| 549 | NULL, /* value_has_mutated */ |
| 550 | c_is_path_expr_parent /* is_path_expr_parent */ |
| 551 | }; |
| 552 | |
| 553 | /* A little convenience enum for dealing with C++. */ |
| 554 | enum vsections |
| 555 | { |
| 556 | v_public = 0, v_private, v_protected |
| 557 | }; |
| 558 | |
| 559 | /* C++ */ |
| 560 | |
| 561 | static int |
| 562 | cplus_number_of_children (const struct varobj *var) |
| 563 | { |
| 564 | struct value *value = NULL; |
| 565 | struct type *type; |
| 566 | int children, dont_know; |
| 567 | int lookup_actual_type = 0; |
| 568 | struct value_print_options opts; |
| 569 | |
| 570 | dont_know = 1; |
| 571 | children = 0; |
| 572 | |
| 573 | get_user_print_options (&opts); |
| 574 | |
| 575 | if (!CPLUS_FAKE_CHILD (var)) |
| 576 | { |
| 577 | type = varobj_get_value_type (var); |
| 578 | |
| 579 | /* It is necessary to access a real type (via RTTI). */ |
| 580 | if (opts.objectprint) |
| 581 | { |
| 582 | value = var->value; |
| 583 | lookup_actual_type = (TYPE_IS_REFERENCE (var->type) |
| 584 | || TYPE_CODE (var->type) == TYPE_CODE_PTR); |
| 585 | } |
| 586 | adjust_value_for_child_access (&value, &type, NULL, lookup_actual_type); |
| 587 | |
| 588 | if (((TYPE_CODE (type)) == TYPE_CODE_STRUCT) |
| 589 | || ((TYPE_CODE (type)) == TYPE_CODE_UNION)) |
| 590 | { |
| 591 | int kids[3]; |
| 592 | |
| 593 | cplus_class_num_children (type, kids); |
| 594 | if (kids[v_public] != 0) |
| 595 | children++; |
| 596 | if (kids[v_private] != 0) |
| 597 | children++; |
| 598 | if (kids[v_protected] != 0) |
| 599 | children++; |
| 600 | |
| 601 | /* Add any baseclasses. */ |
| 602 | children += TYPE_N_BASECLASSES (type); |
| 603 | dont_know = 0; |
| 604 | |
| 605 | /* FIXME: save children in var. */ |
| 606 | } |
| 607 | } |
| 608 | else |
| 609 | { |
| 610 | int kids[3]; |
| 611 | |
| 612 | type = varobj_get_value_type (var->parent); |
| 613 | |
| 614 | /* It is necessary to access a real type (via RTTI). */ |
| 615 | if (opts.objectprint) |
| 616 | { |
| 617 | const struct varobj *parent = var->parent; |
| 618 | |
| 619 | value = parent->value; |
| 620 | lookup_actual_type = (TYPE_IS_REFERENCE (parent->type) |
| 621 | || TYPE_CODE (parent->type) == TYPE_CODE_PTR); |
| 622 | } |
| 623 | adjust_value_for_child_access (&value, &type, NULL, lookup_actual_type); |
| 624 | |
| 625 | cplus_class_num_children (type, kids); |
| 626 | if (var->name == "public") |
| 627 | children = kids[v_public]; |
| 628 | else if (var->name == "private") |
| 629 | children = kids[v_private]; |
| 630 | else |
| 631 | children = kids[v_protected]; |
| 632 | dont_know = 0; |
| 633 | } |
| 634 | |
| 635 | if (dont_know) |
| 636 | children = c_number_of_children (var); |
| 637 | |
| 638 | return children; |
| 639 | } |
| 640 | |
| 641 | /* Compute # of public, private, and protected variables in this class. |
| 642 | That means we need to descend into all baseclasses and find out |
| 643 | how many are there, too. */ |
| 644 | |
| 645 | static void |
| 646 | cplus_class_num_children (struct type *type, int children[3]) |
| 647 | { |
| 648 | int i, vptr_fieldno; |
| 649 | struct type *basetype = NULL; |
| 650 | |
| 651 | children[v_public] = 0; |
| 652 | children[v_private] = 0; |
| 653 | children[v_protected] = 0; |
| 654 | |
| 655 | vptr_fieldno = get_vptr_fieldno (type, &basetype); |
| 656 | for (i = TYPE_N_BASECLASSES (type); i < TYPE_NFIELDS (type); i++) |
| 657 | { |
| 658 | /* If we have a virtual table pointer, omit it. Even if virtual |
| 659 | table pointers are not specifically marked in the debug info, |
| 660 | they should be artificial. */ |
| 661 | if ((type == basetype && i == vptr_fieldno) |
| 662 | || TYPE_FIELD_ARTIFICIAL (type, i)) |
| 663 | continue; |
| 664 | |
| 665 | if (TYPE_FIELD_PROTECTED (type, i)) |
| 666 | children[v_protected]++; |
| 667 | else if (TYPE_FIELD_PRIVATE (type, i)) |
| 668 | children[v_private]++; |
| 669 | else |
| 670 | children[v_public]++; |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | static std::string |
| 675 | cplus_name_of_variable (const struct varobj *parent) |
| 676 | { |
| 677 | return c_name_of_variable (parent); |
| 678 | } |
| 679 | |
| 680 | enum accessibility { private_field, protected_field, public_field }; |
| 681 | |
| 682 | /* Check if field INDEX of TYPE has the specified accessibility. |
| 683 | Return 0 if so and 1 otherwise. */ |
| 684 | |
| 685 | static int |
| 686 | match_accessibility (struct type *type, int index, enum accessibility acc) |
| 687 | { |
| 688 | if (acc == private_field && TYPE_FIELD_PRIVATE (type, index)) |
| 689 | return 1; |
| 690 | else if (acc == protected_field && TYPE_FIELD_PROTECTED (type, index)) |
| 691 | return 1; |
| 692 | else if (acc == public_field && !TYPE_FIELD_PRIVATE (type, index) |
| 693 | && !TYPE_FIELD_PROTECTED (type, index)) |
| 694 | return 1; |
| 695 | else |
| 696 | return 0; |
| 697 | } |
| 698 | |
| 699 | static void |
| 700 | cplus_describe_child (const struct varobj *parent, int index, |
| 701 | std::string *cname, struct value **cvalue, struct type **ctype, |
| 702 | std::string *cfull_expression) |
| 703 | { |
| 704 | struct value *value; |
| 705 | struct type *type; |
| 706 | int was_ptr; |
| 707 | int lookup_actual_type = 0; |
| 708 | const char *parent_expression = NULL; |
| 709 | const struct varobj *var; |
| 710 | struct value_print_options opts; |
| 711 | |
| 712 | if (cname) |
| 713 | *cname = std::string (); |
| 714 | if (cvalue) |
| 715 | *cvalue = NULL; |
| 716 | if (ctype) |
| 717 | *ctype = NULL; |
| 718 | if (cfull_expression) |
| 719 | *cfull_expression = std::string (); |
| 720 | |
| 721 | get_user_print_options (&opts); |
| 722 | |
| 723 | var = (CPLUS_FAKE_CHILD (parent)) ? parent->parent : parent; |
| 724 | if (opts.objectprint) |
| 725 | lookup_actual_type = (TYPE_IS_REFERENCE (var->type) |
| 726 | || TYPE_CODE (var->type) == TYPE_CODE_PTR); |
| 727 | value = var->value; |
| 728 | type = varobj_get_value_type (var); |
| 729 | if (cfull_expression) |
| 730 | parent_expression |
| 731 | = varobj_get_path_expr (varobj_get_path_expr_parent (var)); |
| 732 | |
| 733 | adjust_value_for_child_access (&value, &type, &was_ptr, lookup_actual_type); |
| 734 | |
| 735 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 736 | || TYPE_CODE (type) == TYPE_CODE_UNION) |
| 737 | { |
| 738 | const char *join = was_ptr ? "->" : "."; |
| 739 | |
| 740 | if (CPLUS_FAKE_CHILD (parent)) |
| 741 | { |
| 742 | /* The fields of the class type are ordered as they |
| 743 | appear in the class. We are given an index for a |
| 744 | particular access control type ("public","protected", |
| 745 | or "private"). We must skip over fields that don't |
| 746 | have the access control we are looking for to properly |
| 747 | find the indexed field. */ |
| 748 | int type_index = TYPE_N_BASECLASSES (type); |
| 749 | enum accessibility acc = public_field; |
| 750 | int vptr_fieldno; |
| 751 | struct type *basetype = NULL; |
| 752 | const char *field_name; |
| 753 | |
| 754 | vptr_fieldno = get_vptr_fieldno (type, &basetype); |
| 755 | if (parent->name == "private") |
| 756 | acc = private_field; |
| 757 | else if (parent->name == "protected") |
| 758 | acc = protected_field; |
| 759 | |
| 760 | while (index >= 0) |
| 761 | { |
| 762 | if ((type == basetype && type_index == vptr_fieldno) |
| 763 | || TYPE_FIELD_ARTIFICIAL (type, type_index)) |
| 764 | ; /* ignore vptr */ |
| 765 | else if (match_accessibility (type, type_index, acc)) |
| 766 | --index; |
| 767 | ++type_index; |
| 768 | } |
| 769 | --type_index; |
| 770 | |
| 771 | /* If the type is anonymous and the field has no name, |
| 772 | set an appopriate name. */ |
| 773 | field_name = TYPE_FIELD_NAME (type, type_index); |
| 774 | if (field_name == NULL || *field_name == '\0') |
| 775 | { |
| 776 | if (cname) |
| 777 | { |
| 778 | if (TYPE_CODE (TYPE_FIELD_TYPE (type, type_index)) |
| 779 | == TYPE_CODE_STRUCT) |
| 780 | *cname = ANONYMOUS_STRUCT_NAME; |
| 781 | else if (TYPE_CODE (TYPE_FIELD_TYPE (type, type_index)) |
| 782 | == TYPE_CODE_UNION) |
| 783 | *cname = ANONYMOUS_UNION_NAME; |
| 784 | } |
| 785 | |
| 786 | if (cfull_expression) |
| 787 | *cfull_expression = std::string (); |
| 788 | } |
| 789 | else |
| 790 | { |
| 791 | if (cname) |
| 792 | *cname = TYPE_FIELD_NAME (type, type_index); |
| 793 | |
| 794 | if (cfull_expression) |
| 795 | *cfull_expression |
| 796 | = string_printf ("((%s)%s%s)", parent_expression, join, |
| 797 | field_name); |
| 798 | } |
| 799 | |
| 800 | if (cvalue && value) |
| 801 | *cvalue = value_struct_element_index (value, type_index); |
| 802 | |
| 803 | if (ctype) |
| 804 | *ctype = TYPE_FIELD_TYPE (type, type_index); |
| 805 | } |
| 806 | else if (index < TYPE_N_BASECLASSES (type)) |
| 807 | { |
| 808 | /* This is a baseclass. */ |
| 809 | if (cname) |
| 810 | *cname = TYPE_FIELD_NAME (type, index); |
| 811 | |
| 812 | if (cvalue && value) |
| 813 | *cvalue = value_cast (TYPE_FIELD_TYPE (type, index), value); |
| 814 | |
| 815 | if (ctype) |
| 816 | { |
| 817 | *ctype = TYPE_FIELD_TYPE (type, index); |
| 818 | } |
| 819 | |
| 820 | if (cfull_expression) |
| 821 | { |
| 822 | const char *ptr = was_ptr ? "*" : ""; |
| 823 | |
| 824 | /* Cast the parent to the base' type. Note that in gdb, |
| 825 | expression like |
| 826 | (Base1)d |
| 827 | will create an lvalue, for all appearences, so we don't |
| 828 | need to use more fancy: |
| 829 | *(Base1*)(&d) |
| 830 | construct. |
| 831 | |
| 832 | When we are in the scope of the base class or of one |
| 833 | of its children, the type field name will be interpreted |
| 834 | as a constructor, if it exists. Therefore, we must |
| 835 | indicate that the name is a class name by using the |
| 836 | 'class' keyword. See PR mi/11912 */ |
| 837 | *cfull_expression = string_printf ("(%s(class %s%s) %s)", |
| 838 | ptr, |
| 839 | TYPE_FIELD_NAME (type, index), |
| 840 | ptr, |
| 841 | parent_expression); |
| 842 | } |
| 843 | } |
| 844 | else |
| 845 | { |
| 846 | const char *access = NULL; |
| 847 | int children[3]; |
| 848 | |
| 849 | cplus_class_num_children (type, children); |
| 850 | |
| 851 | /* Everything beyond the baseclasses can |
| 852 | only be "public", "private", or "protected" |
| 853 | |
| 854 | The special "fake" children are always output by varobj in |
| 855 | this order. So if INDEX == 2, it MUST be "protected". */ |
| 856 | index -= TYPE_N_BASECLASSES (type); |
| 857 | switch (index) |
| 858 | { |
| 859 | case 0: |
| 860 | if (children[v_public] > 0) |
| 861 | access = "public"; |
| 862 | else if (children[v_private] > 0) |
| 863 | access = "private"; |
| 864 | else |
| 865 | access = "protected"; |
| 866 | break; |
| 867 | case 1: |
| 868 | if (children[v_public] > 0) |
| 869 | { |
| 870 | if (children[v_private] > 0) |
| 871 | access = "private"; |
| 872 | else |
| 873 | access = "protected"; |
| 874 | } |
| 875 | else if (children[v_private] > 0) |
| 876 | access = "protected"; |
| 877 | break; |
| 878 | case 2: |
| 879 | /* Must be protected. */ |
| 880 | access = "protected"; |
| 881 | break; |
| 882 | default: |
| 883 | /* error! */ |
| 884 | break; |
| 885 | } |
| 886 | |
| 887 | gdb_assert (access); |
| 888 | if (cname) |
| 889 | *cname = access; |
| 890 | |
| 891 | /* Value and type and full expression are null here. */ |
| 892 | } |
| 893 | } |
| 894 | else |
| 895 | { |
| 896 | c_describe_child (parent, index, cname, cvalue, ctype, cfull_expression); |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | static std::string |
| 901 | cplus_name_of_child (const struct varobj *parent, int index) |
| 902 | { |
| 903 | std::string name; |
| 904 | |
| 905 | cplus_describe_child (parent, index, &name, NULL, NULL, NULL); |
| 906 | return name; |
| 907 | } |
| 908 | |
| 909 | static std::string |
| 910 | cplus_path_expr_of_child (const struct varobj *child) |
| 911 | { |
| 912 | std::string path_expr; |
| 913 | |
| 914 | cplus_describe_child (child->parent, child->index, NULL, NULL, NULL, |
| 915 | &path_expr); |
| 916 | return path_expr; |
| 917 | } |
| 918 | |
| 919 | static struct value * |
| 920 | cplus_value_of_child (const struct varobj *parent, int index) |
| 921 | { |
| 922 | struct value *value = NULL; |
| 923 | |
| 924 | cplus_describe_child (parent, index, NULL, &value, NULL, NULL); |
| 925 | return value; |
| 926 | } |
| 927 | |
| 928 | static struct type * |
| 929 | cplus_type_of_child (const struct varobj *parent, int index) |
| 930 | { |
| 931 | struct type *type = NULL; |
| 932 | |
| 933 | cplus_describe_child (parent, index, NULL, NULL, &type, NULL); |
| 934 | return type; |
| 935 | } |
| 936 | |
| 937 | static std::string |
| 938 | cplus_value_of_variable (const struct varobj *var, |
| 939 | enum varobj_display_formats format) |
| 940 | { |
| 941 | |
| 942 | /* If we have one of our special types, don't print out |
| 943 | any value. */ |
| 944 | if (CPLUS_FAKE_CHILD (var)) |
| 945 | return std::string (); |
| 946 | |
| 947 | return c_value_of_variable (var, format); |
| 948 | } |
| 949 | \f |
| 950 | |
| 951 | /* varobj operations for c++. */ |
| 952 | |
| 953 | const struct lang_varobj_ops cplus_varobj_ops = |
| 954 | { |
| 955 | cplus_number_of_children, |
| 956 | cplus_name_of_variable, |
| 957 | cplus_name_of_child, |
| 958 | cplus_path_expr_of_child, |
| 959 | cplus_value_of_child, |
| 960 | cplus_type_of_child, |
| 961 | cplus_value_of_variable, |
| 962 | varobj_default_value_is_changeable_p, |
| 963 | NULL, /* value_has_mutated */ |
| 964 | c_is_path_expr_parent /* is_path_expr_parent */ |
| 965 | }; |
| 966 | |
| 967 | \f |