1 /* Helper routines for C++ support in GDB. 2 Copyright (C) 2003-2013 Free Software Foundation, Inc. 3 4 Contributed by David Carlton and by Kealia, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 22 #include "cp-support.h" 23 #include "gdb_obstack.h" 24 #include "symtab.h" 25 #include "symfile.h" 26 #include "gdb_assert.h" 27 #include "block.h" 28 #include "objfiles.h" 29 #include "gdbtypes.h" 30 #include "dictionary.h" 31 #include "command.h" 32 #include "frame.h" 33 #include "buildsym.h" 34 #include "language.h" 35 36 static struct symbol *lookup_namespace_scope (const char *name, 37 const struct block *block, 38 const domain_enum domain, 39 const char *scope, 40 int scope_len); 41 42 static struct symbol *lookup_symbol_file (const char *name, 43 const struct block *block, 44 const domain_enum domain, 45 int anonymous_namespace, 46 int search); 47 48 static struct type *cp_lookup_transparent_type_loop (const char *name, 49 const char *scope, 50 int scope_len); 51 52 /* Check to see if SYMBOL refers to an object contained within an 53 anonymous namespace; if so, add an appropriate using directive. */ 54 55 void 56 cp_scan_for_anonymous_namespaces (const struct symbol *const symbol, 57 struct objfile *const objfile) 58 { 59 if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) 60 { 61 const char *name = SYMBOL_DEMANGLED_NAME (symbol); 62 unsigned int previous_component; 63 unsigned int next_component; 64 65 /* Start with a quick-and-dirty check for mention of "(anonymous 66 namespace)". */ 67 68 if (!cp_is_anonymous (name)) 69 return; 70 71 previous_component = 0; 72 next_component = cp_find_first_component (name + previous_component); 73 74 while (name[next_component] == ':') 75 { 76 if (((next_component - previous_component) 77 == CP_ANONYMOUS_NAMESPACE_LEN) 78 && strncmp (name + previous_component, 79 CP_ANONYMOUS_NAMESPACE_STR, 80 CP_ANONYMOUS_NAMESPACE_LEN) == 0) 81 { 82 int dest_len = (previous_component == 0 83 ? 0 : previous_component - 2); 84 int src_len = next_component; 85 86 char *dest = alloca (dest_len + 1); 87 char *src = alloca (src_len + 1); 88 89 memcpy (dest, name, dest_len); 90 memcpy (src, name, src_len); 91 92 dest[dest_len] = '\0'; 93 src[src_len] = '\0'; 94 95 /* We've found a component of the name that's an 96 anonymous namespace. So add symbols in it to the 97 namespace given by the previous component if there is 98 one, or to the global namespace if there isn't. */ 99 cp_add_using_directive (dest, src, NULL, NULL, NULL, 1, 100 &objfile->objfile_obstack); 101 } 102 /* The "+ 2" is for the "::". */ 103 previous_component = next_component + 2; 104 next_component = (previous_component 105 + cp_find_first_component (name 106 + previous_component)); 107 } 108 } 109 } 110 111 112 /* Add a using directive to using_directives. If the using directive 113 in question has already been added, don't add it twice. 114 115 Create a new struct using_direct which imports the namespace SRC 116 into the scope DEST. ALIAS is the name of the imported namespace 117 in the current scope. If ALIAS is NULL then the namespace is known 118 by its original name. DECLARATION is the name if the imported 119 varable if this is a declaration import (Eg. using A::x), otherwise 120 it is NULL. EXCLUDES is a list of names not to import from an 121 imported module or NULL. If COPY_NAMES is non-zero, then the 122 arguments are copied into newly allocated memory so they can be 123 temporaries. For EXCLUDES the VEC pointers are copied but the 124 pointed to characters are not copied. */ 125 126 void 127 cp_add_using_directive (const char *dest, 128 const char *src, 129 const char *alias, 130 const char *declaration, 131 VEC (const_char_ptr) *excludes, 132 int copy_names, 133 struct obstack *obstack) 134 { 135 struct using_direct *current; 136 struct using_direct *new; 137 138 /* Has it already been added? */ 139 140 for (current = using_directives; current != NULL; current = current->next) 141 { 142 int ix; 143 const char *param; 144 145 if (strcmp (current->import_src, src) != 0) 146 continue; 147 if (strcmp (current->import_dest, dest) != 0) 148 continue; 149 if ((alias == NULL && current->alias != NULL) 150 || (alias != NULL && current->alias == NULL) 151 || (alias != NULL && current->alias != NULL 152 && strcmp (alias, current->alias) != 0)) 153 continue; 154 if ((declaration == NULL && current->declaration != NULL) 155 || (declaration != NULL && current->declaration == NULL) 156 || (declaration != NULL && current->declaration != NULL 157 && strcmp (declaration, current->declaration) != 0)) 158 continue; 159 160 /* Compare the contents of EXCLUDES. */ 161 for (ix = 0; VEC_iterate (const_char_ptr, excludes, ix, param); ix++) 162 if (current->excludes[ix] == NULL 163 || strcmp (param, current->excludes[ix]) != 0) 164 break; 165 if (ix < VEC_length (const_char_ptr, excludes) 166 || current->excludes[ix] != NULL) 167 continue; 168 169 /* Parameters exactly match CURRENT. */ 170 return; 171 } 172 173 new = obstack_alloc (obstack, (sizeof (*new) 174 + (VEC_length (const_char_ptr, excludes) 175 * sizeof (*new->excludes)))); 176 memset (new, 0, sizeof (*new)); 177 178 if (copy_names) 179 { 180 new->import_src = obstack_copy0 (obstack, src, strlen (src)); 181 new->import_dest = obstack_copy0 (obstack, dest, strlen (dest)); 182 } 183 else 184 { 185 new->import_src = src; 186 new->import_dest = dest; 187 } 188 189 if (alias != NULL && copy_names) 190 new->alias = obstack_copy0 (obstack, alias, strlen (alias)); 191 else 192 new->alias = alias; 193 194 if (declaration != NULL && copy_names) 195 new->declaration = obstack_copy0 (obstack, 196 declaration, strlen (declaration)); 197 else 198 new->declaration = declaration; 199 200 memcpy (new->excludes, VEC_address (const_char_ptr, excludes), 201 VEC_length (const_char_ptr, excludes) * sizeof (*new->excludes)); 202 new->excludes[VEC_length (const_char_ptr, excludes)] = NULL; 203 204 new->next = using_directives; 205 using_directives = new; 206 } 207 208 /* Test whether or not NAMESPACE looks like it mentions an anonymous 209 namespace; return nonzero if so. */ 210 211 int 212 cp_is_anonymous (const char *namespace) 213 { 214 return (strstr (namespace, CP_ANONYMOUS_NAMESPACE_STR) 215 != NULL); 216 } 217 218 /* The C++-specific version of name lookup for static and global 219 names. This makes sure that names get looked for in all namespaces 220 that are in scope. NAME is the natural name of the symbol that 221 we're looking for, BLOCK is the block that we're searching within, 222 DOMAIN says what kind of symbols we're looking for, and if SYMTAB 223 is non-NULL, we should store the symtab where we found the symbol 224 in it. */ 225 226 struct symbol * 227 cp_lookup_symbol_nonlocal (const char *name, 228 const struct block *block, 229 const domain_enum domain) 230 { 231 struct symbol *sym; 232 const char *scope = block_scope (block); 233 234 sym = lookup_namespace_scope (name, block, 235 domain, scope, 0); 236 if (sym != NULL) 237 return sym; 238 239 return cp_lookup_symbol_namespace (scope, name, 240 block, domain); 241 } 242 243 /* Look up NAME in the C++ namespace NAMESPACE. Other arguments are 244 as in cp_lookup_symbol_nonlocal. If SEARCH is non-zero, search 245 through base classes for a matching symbol. */ 246 247 static struct symbol * 248 cp_lookup_symbol_in_namespace (const char *namespace, 249 const char *name, 250 const struct block *block, 251 const domain_enum domain, int search) 252 { 253 if (namespace[0] == '\0') 254 { 255 return lookup_symbol_file (name, block, domain, 0, search); 256 } 257 else 258 { 259 char *concatenated_name = alloca (strlen (namespace) + 2 260 + strlen (name) + 1); 261 262 strcpy (concatenated_name, namespace); 263 strcat (concatenated_name, "::"); 264 strcat (concatenated_name, name); 265 return lookup_symbol_file (concatenated_name, block, domain, 266 cp_is_anonymous (namespace), search); 267 } 268 } 269 270 /* Used for cleanups to reset the "searched" flag incase 271 of an error. */ 272 273 static void 274 reset_directive_searched (void *data) 275 { 276 struct using_direct *direct = data; 277 direct->searched = 0; 278 } 279 280 /* Search for NAME by applying all import statements belonging to 281 BLOCK which are applicable in SCOPE. If DECLARATION_ONLY the 282 search is restricted to using declarations. 283 Example: 284 285 namespace A { 286 int x; 287 } 288 using A::x; 289 290 If SEARCH_PARENTS the search will include imports which are 291 applicable in parents of SCOPE. 292 Example: 293 294 namespace A { 295 using namespace X; 296 namespace B { 297 using namespace Y; 298 } 299 } 300 301 If SCOPE is "A::B" and SEARCH_PARENTS is true the imports of 302 namespaces X and Y will be considered. If SEARCH_PARENTS is false 303 only the import of Y is considered. */ 304 305 struct symbol * 306 cp_lookup_symbol_imports (const char *scope, 307 const char *name, 308 const struct block *block, 309 const domain_enum domain, 310 const int declaration_only, 311 const int search_parents) 312 { 313 struct using_direct *current; 314 struct symbol *sym = NULL; 315 int len; 316 int directive_match; 317 struct cleanup *searched_cleanup; 318 319 /* First, try to find the symbol in the given namespace. */ 320 if (!declaration_only) 321 sym = cp_lookup_symbol_in_namespace (scope, name, 322 block, domain, 1); 323 324 if (sym != NULL) 325 return sym; 326 327 /* Go through the using directives. If any of them add new names to 328 the namespace we're searching in, see if we can find a match by 329 applying them. */ 330 331 for (current = block_using (block); 332 current != NULL; 333 current = current->next) 334 { 335 const char **excludep; 336 337 len = strlen (current->import_dest); 338 directive_match = (search_parents 339 ? (strncmp (scope, current->import_dest, 340 strlen (current->import_dest)) == 0 341 && (len == 0 342 || scope[len] == ':' 343 || scope[len] == '\0')) 344 : strcmp (scope, current->import_dest) == 0); 345 346 /* If the import destination is the current scope or one of its 347 ancestors then it is applicable. */ 348 if (directive_match && !current->searched) 349 { 350 /* Mark this import as searched so that the recursive call 351 does not search it again. */ 352 current->searched = 1; 353 searched_cleanup = make_cleanup (reset_directive_searched, 354 current); 355 356 /* If there is an import of a single declaration, compare the 357 imported declaration (after optional renaming by its alias) 358 with the sought out name. If there is a match pass 359 current->import_src as NAMESPACE to direct the search 360 towards the imported namespace. */ 361 if (current->declaration 362 && strcmp (name, current->alias 363 ? current->alias : current->declaration) == 0) 364 sym = cp_lookup_symbol_in_namespace (current->import_src, 365 current->declaration, 366 block, domain, 1); 367 368 /* If this is a DECLARATION_ONLY search or a symbol was found 369 or this import statement was an import declaration, the 370 search of this import is complete. */ 371 if (declaration_only || sym != NULL || current->declaration) 372 { 373 current->searched = 0; 374 discard_cleanups (searched_cleanup); 375 376 if (sym != NULL) 377 return sym; 378 379 continue; 380 } 381 382 /* Do not follow CURRENT if NAME matches its EXCLUDES. */ 383 for (excludep = current->excludes; *excludep; excludep++) 384 if (strcmp (name, *excludep) == 0) 385 break; 386 if (*excludep) 387 { 388 discard_cleanups (searched_cleanup); 389 continue; 390 } 391 392 if (current->alias != NULL 393 && strcmp (name, current->alias) == 0) 394 /* If the import is creating an alias and the alias matches 395 the sought name. Pass current->import_src as the NAME to 396 direct the search towards the aliased namespace. */ 397 { 398 sym = cp_lookup_symbol_in_namespace (scope, 399 current->import_src, 400 block, domain, 1); 401 } 402 else if (current->alias == NULL) 403 { 404 /* If this import statement creates no alias, pass 405 current->inner as NAMESPACE to direct the search 406 towards the imported namespace. */ 407 sym = cp_lookup_symbol_imports (current->import_src, 408 name, block, 409 domain, 0, 0); 410 } 411 current->searched = 0; 412 discard_cleanups (searched_cleanup); 413 414 if (sym != NULL) 415 return sym; 416 } 417 } 418 419 return NULL; 420 } 421 422 /* Helper function that searches an array of symbols for one named 423 NAME. */ 424 425 static struct symbol * 426 search_symbol_list (const char *name, int num, 427 struct symbol **syms) 428 { 429 int i; 430 431 /* Maybe we should store a dictionary in here instead. */ 432 for (i = 0; i < num; ++i) 433 { 434 if (strcmp (name, SYMBOL_NATURAL_NAME (syms[i])) == 0) 435 return syms[i]; 436 } 437 return NULL; 438 } 439 440 /* Like cp_lookup_symbol_imports, but if BLOCK is a function, it 441 searches through the template parameters of the function and the 442 function's type. */ 443 444 struct symbol * 445 cp_lookup_symbol_imports_or_template (const char *scope, 446 const char *name, 447 const struct block *block, 448 const domain_enum domain) 449 { 450 struct symbol *function = BLOCK_FUNCTION (block); 451 452 if (function != NULL && SYMBOL_LANGUAGE (function) == language_cplus) 453 { 454 /* Search the function's template parameters. */ 455 if (SYMBOL_IS_CPLUS_TEMPLATE_FUNCTION (function)) 456 { 457 struct template_symbol *templ 458 = (struct template_symbol *) function; 459 struct symbol *result; 460 461 result = search_symbol_list (name, 462 templ->n_template_arguments, 463 templ->template_arguments); 464 if (result != NULL) 465 return result; 466 } 467 468 /* Search the template parameters of the function's defining 469 context. */ 470 if (SYMBOL_NATURAL_NAME (function)) 471 { 472 struct type *context; 473 char *name_copy = xstrdup (SYMBOL_NATURAL_NAME (function)); 474 struct cleanup *cleanups = make_cleanup (xfree, name_copy); 475 const struct language_defn *lang = language_def (language_cplus); 476 struct gdbarch *arch = SYMBOL_SYMTAB (function)->objfile->gdbarch; 477 const struct block *parent = BLOCK_SUPERBLOCK (block); 478 479 while (1) 480 { 481 struct symbol *result; 482 unsigned int prefix_len = cp_entire_prefix_len (name_copy); 483 484 if (prefix_len == 0) 485 context = NULL; 486 else 487 { 488 name_copy[prefix_len] = '\0'; 489 context = lookup_typename (lang, arch, 490 name_copy, 491 parent, 1); 492 } 493 494 if (context == NULL) 495 break; 496 497 result 498 = search_symbol_list (name, 499 TYPE_N_TEMPLATE_ARGUMENTS (context), 500 TYPE_TEMPLATE_ARGUMENTS (context)); 501 if (result != NULL) 502 return result; 503 } 504 505 do_cleanups (cleanups); 506 } 507 } 508 509 return cp_lookup_symbol_imports (scope, name, block, domain, 1, 1); 510 } 511 512 /* Searches for NAME in the current namespace, and by applying 513 relevant import statements belonging to BLOCK and its parents. 514 SCOPE is the namespace scope of the context in which the search is 515 being evaluated. */ 516 517 struct symbol* 518 cp_lookup_symbol_namespace (const char *scope, 519 const char *name, 520 const struct block *block, 521 const domain_enum domain) 522 { 523 struct symbol *sym; 524 525 /* First, try to find the symbol in the given namespace. */ 526 sym = cp_lookup_symbol_in_namespace (scope, name, 527 block, domain, 1); 528 if (sym != NULL) 529 return sym; 530 531 /* Search for name in namespaces imported to this and parent 532 blocks. */ 533 while (block != NULL) 534 { 535 sym = cp_lookup_symbol_imports (scope, name, block, 536 domain, 0, 1); 537 538 if (sym) 539 return sym; 540 541 block = BLOCK_SUPERBLOCK (block); 542 } 543 544 return NULL; 545 } 546 547 /* Lookup NAME at namespace scope (or, in C terms, in static and 548 global variables). SCOPE is the namespace that the current 549 function is defined within; only consider namespaces whose length 550 is at least SCOPE_LEN. Other arguments are as in 551 cp_lookup_symbol_nonlocal. 552 553 For example, if we're within a function A::B::f and looking for a 554 symbol x, this will get called with NAME = "x", SCOPE = "A::B", and 555 SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, 556 but with SCOPE_LEN = 1. And then it calls itself with NAME and 557 SCOPE the same, but with SCOPE_LEN = 4. This third call looks for 558 "A::B::x"; if it doesn't find it, then the second call looks for 559 "A::x", and if that call fails, then the first call looks for 560 "x". */ 561 562 static struct symbol * 563 lookup_namespace_scope (const char *name, 564 const struct block *block, 565 const domain_enum domain, 566 const char *scope, 567 int scope_len) 568 { 569 char *namespace; 570 571 if (scope[scope_len] != '\0') 572 { 573 /* Recursively search for names in child namespaces first. */ 574 575 struct symbol *sym; 576 int new_scope_len = scope_len; 577 578 /* If the current scope is followed by "::", skip past that. */ 579 if (new_scope_len != 0) 580 { 581 gdb_assert (scope[new_scope_len] == ':'); 582 new_scope_len += 2; 583 } 584 new_scope_len += cp_find_first_component (scope + new_scope_len); 585 sym = lookup_namespace_scope (name, block, domain, 586 scope, new_scope_len); 587 if (sym != NULL) 588 return sym; 589 } 590 591 /* Okay, we didn't find a match in our children, so look for the 592 name in the current namespace. */ 593 594 namespace = alloca (scope_len + 1); 595 strncpy (namespace, scope, scope_len); 596 namespace[scope_len] = '\0'; 597 return cp_lookup_symbol_in_namespace (namespace, name, 598 block, domain, 1); 599 } 600 601 /* Look up NAME in BLOCK's static block and in global blocks. If 602 ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located 603 within an anonymous namespace. If SEARCH is non-zero, search through 604 base classes for a matching symbol. Other arguments are as in 605 cp_lookup_symbol_nonlocal. */ 606 607 static struct symbol * 608 lookup_symbol_file (const char *name, 609 const struct block *block, 610 const domain_enum domain, 611 int anonymous_namespace, int search) 612 { 613 struct symbol *sym = NULL; 614 615 sym = lookup_symbol_static (name, block, domain); 616 if (sym != NULL) 617 return sym; 618 619 if (anonymous_namespace) 620 { 621 /* Symbols defined in anonymous namespaces have external linkage 622 but should be treated as local to a single file nonetheless. 623 So we only search the current file's global block. */ 624 625 const struct block *global_block = block_global_block (block); 626 627 if (global_block != NULL) 628 sym = lookup_symbol_aux_block (name, global_block, domain); 629 } 630 else 631 { 632 sym = lookup_symbol_global (name, block, domain); 633 } 634 635 if (sym != NULL) 636 return sym; 637 638 if (search) 639 { 640 char *klass, *nested; 641 unsigned int prefix_len; 642 struct cleanup *cleanup; 643 struct symbol *klass_sym; 644 645 /* A simple lookup failed. Check if the symbol was defined in 646 a base class. */ 647 648 cleanup = make_cleanup (null_cleanup, NULL); 649 650 /* Find the name of the class and the name of the method, 651 variable, etc. */ 652 prefix_len = cp_entire_prefix_len (name); 653 654 /* If no prefix was found, search "this". */ 655 if (prefix_len == 0) 656 { 657 struct type *type; 658 struct symbol *this; 659 660 this = lookup_language_this (language_def (language_cplus), block); 661 if (this == NULL) 662 { 663 do_cleanups (cleanup); 664 return NULL; 665 } 666 667 type = check_typedef (TYPE_TARGET_TYPE (SYMBOL_TYPE (this))); 668 klass = xstrdup (TYPE_NAME (type)); 669 nested = xstrdup (name); 670 } 671 else 672 { 673 /* The class name is everything up to and including PREFIX_LEN. */ 674 klass = savestring (name, prefix_len); 675 676 /* The rest of the name is everything else past the initial scope 677 operator. */ 678 nested = xstrdup (name + prefix_len + 2); 679 } 680 681 /* Add cleanups to free memory for these strings. */ 682 make_cleanup (xfree, klass); 683 make_cleanup (xfree, nested); 684 685 /* Lookup a class named KLASS. If none is found, there is nothing 686 more that can be done. */ 687 klass_sym = lookup_symbol_global (klass, block, domain); 688 if (klass_sym == NULL) 689 { 690 do_cleanups (cleanup); 691 return NULL; 692 } 693 694 /* Look for a symbol named NESTED in this class. */ 695 sym = cp_lookup_nested_symbol (SYMBOL_TYPE (klass_sym), nested, block); 696 do_cleanups (cleanup); 697 } 698 699 return sym; 700 } 701 702 /* Search through the base classes of PARENT_TYPE for a symbol named 703 NAME in block BLOCK. */ 704 705 static struct symbol * 706 find_symbol_in_baseclass (struct type *parent_type, const char *name, 707 const struct block *block) 708 { 709 int i; 710 struct symbol *sym; 711 struct cleanup *cleanup; 712 char *concatenated_name; 713 714 sym = NULL; 715 concatenated_name = NULL; 716 cleanup = make_cleanup (free_current_contents, &concatenated_name); 717 for (i = 0; i < TYPE_N_BASECLASSES (parent_type); ++i) 718 { 719 size_t len; 720 struct type *base_type = TYPE_BASECLASS (parent_type, i); 721 const char *base_name = TYPE_BASECLASS_NAME (parent_type, i); 722 723 if (base_name == NULL) 724 continue; 725 726 /* Search this particular base class. */ 727 sym = cp_lookup_symbol_in_namespace (base_name, name, block, 728 VAR_DOMAIN, 0); 729 if (sym != NULL) 730 break; 731 732 /* Now search all static file-level symbols. We have to do this for 733 things like typedefs in the class. First search in this symtab, 734 what we want is possibly there. */ 735 len = strlen (base_name) + 2 + strlen (name) + 1; 736 concatenated_name = xrealloc (concatenated_name, len); 737 xsnprintf (concatenated_name, len, "%s::%s", base_name, name); 738 sym = lookup_symbol_static (concatenated_name, block, VAR_DOMAIN); 739 if (sym != NULL) 740 break; 741 742 /* Nope. We now have to search all static blocks in all objfiles, 743 even if block != NULL, because there's no guarantees as to which 744 symtab the symbol we want is in. */ 745 sym = lookup_static_symbol_aux (concatenated_name, VAR_DOMAIN); 746 if (sym != NULL) 747 break; 748 749 /* If this class has base classes, search them next. */ 750 CHECK_TYPEDEF (base_type); 751 if (TYPE_N_BASECLASSES (base_type) > 0) 752 { 753 sym = find_symbol_in_baseclass (base_type, name, block); 754 if (sym != NULL) 755 break; 756 } 757 } 758 759 do_cleanups (cleanup); 760 return sym; 761 } 762 763 /* Look up a symbol named NESTED_NAME that is nested inside the C++ 764 class or namespace given by PARENT_TYPE, from within the context 765 given by BLOCK. Return NULL if there is no such nested type. */ 766 767 struct symbol * 768 cp_lookup_nested_symbol (struct type *parent_type, 769 const char *nested_name, 770 const struct block *block) 771 { 772 /* type_name_no_tag_required provides better error reporting using the 773 original type. */ 774 struct type *saved_parent_type = parent_type; 775 776 CHECK_TYPEDEF (parent_type); 777 778 switch (TYPE_CODE (parent_type)) 779 { 780 case TYPE_CODE_STRUCT: 781 case TYPE_CODE_NAMESPACE: 782 case TYPE_CODE_UNION: 783 { 784 /* NOTE: carlton/2003-11-10: We don't treat C++ class members 785 of classes like, say, data or function members. Instead, 786 they're just represented by symbols whose names are 787 qualified by the name of the surrounding class. This is 788 just like members of namespaces; in particular, 789 lookup_symbol_namespace works when looking them up. */ 790 791 int size; 792 const char *parent_name = type_name_no_tag_or_error (saved_parent_type); 793 struct symbol *sym 794 = cp_lookup_symbol_in_namespace (parent_name, nested_name, 795 block, VAR_DOMAIN, 0); 796 char *concatenated_name; 797 798 if (sym != NULL) 799 return sym; 800 801 /* Now search all static file-level symbols. We have to do this 802 for things like typedefs in the class. We do not try to 803 guess any imported namespace as even the fully specified 804 namespace search is already not C++ compliant and more 805 assumptions could make it too magic. */ 806 807 size = strlen (parent_name) + 2 + strlen (nested_name) + 1; 808 concatenated_name = alloca (size); 809 xsnprintf (concatenated_name, size, "%s::%s", 810 parent_name, nested_name); 811 sym = lookup_static_symbol_aux (concatenated_name, VAR_DOMAIN); 812 if (sym != NULL) 813 return sym; 814 815 /* If no matching symbols were found, try searching any 816 base classes. */ 817 return find_symbol_in_baseclass (parent_type, nested_name, block); 818 } 819 820 case TYPE_CODE_FUNC: 821 case TYPE_CODE_METHOD: 822 return NULL; 823 824 default: 825 internal_error (__FILE__, __LINE__, 826 _("cp_lookup_nested_symbol called " 827 "on a non-aggregate type.")); 828 } 829 } 830 831 /* The C++-version of lookup_transparent_type. */ 832 833 /* FIXME: carlton/2004-01-16: The problem that this is trying to 834 address is that, unfortunately, sometimes NAME is wrong: it may not 835 include the name of namespaces enclosing the type in question. 836 lookup_transparent_type gets called when the type in question 837 is a declaration, and we're trying to find its definition; but, for 838 declarations, our type name deduction mechanism doesn't work. 839 There's nothing we can do to fix this in general, I think, in the 840 absence of debug information about namespaces (I've filed PR 841 gdb/1511 about this); until such debug information becomes more 842 prevalent, one heuristic which sometimes looks is to search for the 843 definition in namespaces containing the current namespace. 844 845 We should delete this functions once the appropriate debug 846 information becomes more widespread. (GCC 3.4 will be the first 847 released version of GCC with such information.) */ 848 849 struct type * 850 cp_lookup_transparent_type (const char *name) 851 { 852 /* First, try the honest way of looking up the definition. */ 853 struct type *t = basic_lookup_transparent_type (name); 854 const char *scope; 855 856 if (t != NULL) 857 return t; 858 859 /* If that doesn't work and we're within a namespace, look there 860 instead. */ 861 scope = block_scope (get_selected_block (0)); 862 863 if (scope[0] == '\0') 864 return NULL; 865 866 return cp_lookup_transparent_type_loop (name, scope, 0); 867 } 868 869 /* Lookup the type definition associated to NAME in namespaces/classes 870 containing SCOPE whose name is strictly longer than LENGTH. LENGTH 871 must be the index of the start of a component of SCOPE. */ 872 873 static struct type * 874 cp_lookup_transparent_type_loop (const char *name, 875 const char *scope, 876 int length) 877 { 878 int scope_length = length + cp_find_first_component (scope + length); 879 char *full_name; 880 881 /* If the current scope is followed by "::", look in the next 882 component. */ 883 if (scope[scope_length] == ':') 884 { 885 struct type *retval 886 = cp_lookup_transparent_type_loop (name, scope, 887 scope_length + 2); 888 889 if (retval != NULL) 890 return retval; 891 } 892 893 full_name = alloca (scope_length + 2 + strlen (name) + 1); 894 strncpy (full_name, scope, scope_length); 895 strncpy (full_name + scope_length, "::", 2); 896 strcpy (full_name + scope_length + 2, name); 897 898 return basic_lookup_transparent_type (full_name); 899 } 900 901 /* This used to do something but was removed when it became 902 obsolete. */ 903 904 static void 905 maintenance_cplus_namespace (char *args, int from_tty) 906 { 907 printf_unfiltered (_("The `maint namespace' command was removed.\n")); 908 } 909 910 /* Provide a prototype to silence -Wmissing-prototypes. */ 911 extern initialize_file_ftype _initialize_cp_namespace; 912 913 void 914 _initialize_cp_namespace (void) 915 { 916 struct cmd_list_element *cmd; 917 918 cmd = add_cmd ("namespace", class_maintenance, 919 maintenance_cplus_namespace, 920 _("Deprecated placeholder for removed functionality."), 921 &maint_cplus_cmd_list); 922 deprecate_cmd (cmd, NULL); 923 } 924