| 1 | /* Helper routines for C++ support in GDB. |
| 2 | Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010, 2011 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by David Carlton and by Kealia, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "cp-support.h" |
| 24 | #include "gdb_obstack.h" |
| 25 | #include "symtab.h" |
| 26 | #include "symfile.h" |
| 27 | #include "gdb_assert.h" |
| 28 | #include "block.h" |
| 29 | #include "objfiles.h" |
| 30 | #include "gdbtypes.h" |
| 31 | #include "dictionary.h" |
| 32 | #include "command.h" |
| 33 | #include "frame.h" |
| 34 | #include "buildsym.h" |
| 35 | #include "language.h" |
| 36 | |
| 37 | static struct symbol *lookup_namespace_scope (const char *name, |
| 38 | const struct block *block, |
| 39 | const domain_enum domain, |
| 40 | const char *scope, |
| 41 | int scope_len); |
| 42 | |
| 43 | static struct symbol *lookup_symbol_file (const char *name, |
| 44 | const struct block *block, |
| 45 | const domain_enum domain, |
| 46 | int anonymous_namespace); |
| 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 | /* Optimize away strlen ("(anonymous namespace)"). */ |
| 56 | |
| 57 | #define ANONYMOUS_NAMESPACE_LEN 21 |
| 58 | |
| 59 | void |
| 60 | cp_scan_for_anonymous_namespaces (const struct symbol *symbol) |
| 61 | { |
| 62 | if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
| 63 | { |
| 64 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
| 65 | unsigned int previous_component; |
| 66 | unsigned int next_component; |
| 67 | |
| 68 | /* Start with a quick-and-dirty check for mention of "(anonymous |
| 69 | namespace)". */ |
| 70 | |
| 71 | if (!cp_is_anonymous (name)) |
| 72 | return; |
| 73 | |
| 74 | previous_component = 0; |
| 75 | next_component = cp_find_first_component (name + previous_component); |
| 76 | |
| 77 | while (name[next_component] == ':') |
| 78 | { |
| 79 | if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN |
| 80 | && strncmp (name + previous_component, |
| 81 | "(anonymous namespace)", |
| 82 | ANONYMOUS_NAMESPACE_LEN) == 0) |
| 83 | { |
| 84 | int dest_len = (previous_component == 0 |
| 85 | ? 0 : previous_component - 2); |
| 86 | int src_len = next_component; |
| 87 | |
| 88 | char *dest = alloca (dest_len + 1); |
| 89 | char *src = alloca (src_len + 1); |
| 90 | |
| 91 | memcpy (dest, name, dest_len); |
| 92 | memcpy (src, name, src_len); |
| 93 | |
| 94 | dest[dest_len] = '\0'; |
| 95 | src[src_len] = '\0'; |
| 96 | |
| 97 | /* We've found a component of the name that's an |
| 98 | anonymous namespace. So add symbols in it to the |
| 99 | namespace given by the previous component if there is |
| 100 | one, or to the global namespace if there isn't. */ |
| 101 | cp_add_using_directive (dest, src, NULL, NULL, |
| 102 | &SYMBOL_SYMTAB (symbol)->objfile->objfile_obstack); |
| 103 | } |
| 104 | /* The "+ 2" is for the "::". */ |
| 105 | previous_component = next_component + 2; |
| 106 | next_component = (previous_component |
| 107 | + cp_find_first_component (name |
| 108 | + previous_component)); |
| 109 | } |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | |
| 114 | /* Add a using directive to using_directives. If the using directive |
| 115 | in question has already been added, don't add it twice. |
| 116 | |
| 117 | Create a new struct using_direct which imports the namespace SRC |
| 118 | into the scope DEST. ALIAS is the name of the imported namespace |
| 119 | in the current scope. If ALIAS is NULL then the namespace is known |
| 120 | by its original name. DECLARATION is the name if the imported |
| 121 | varable if this is a declaration import (Eg. using A::x), otherwise |
| 122 | it is NULL. The arguments are copied into newly allocated memory |
| 123 | so they can be temporaries. */ |
| 124 | |
| 125 | void |
| 126 | cp_add_using_directive (const char *dest, |
| 127 | const char *src, |
| 128 | const char *alias, |
| 129 | const char *declaration, |
| 130 | struct obstack *obstack) |
| 131 | { |
| 132 | struct using_direct *current; |
| 133 | struct using_direct *new; |
| 134 | |
| 135 | /* Has it already been added? */ |
| 136 | |
| 137 | for (current = using_directives; current != NULL; current = current->next) |
| 138 | { |
| 139 | if (strcmp (current->import_src, src) == 0 |
| 140 | && strcmp (current->import_dest, dest) == 0 |
| 141 | && ((alias == NULL && current->alias == NULL) |
| 142 | || (alias != NULL && current->alias != NULL |
| 143 | && strcmp (alias, current->alias) == 0)) |
| 144 | && ((declaration == NULL && current->declaration == NULL) |
| 145 | || (declaration != NULL && current->declaration != NULL |
| 146 | && strcmp (declaration, current->declaration) == 0))) |
| 147 | return; |
| 148 | } |
| 149 | |
| 150 | new = OBSTACK_ZALLOC (obstack, struct using_direct); |
| 151 | |
| 152 | new->import_src = obsavestring (src, strlen (src), obstack); |
| 153 | new->import_dest = obsavestring (dest, strlen (dest), obstack); |
| 154 | |
| 155 | if (alias != NULL) |
| 156 | new->alias = obsavestring (alias, strlen (alias), obstack); |
| 157 | |
| 158 | if (declaration != NULL) |
| 159 | new->declaration = obsavestring (declaration, strlen (declaration), |
| 160 | obstack); |
| 161 | |
| 162 | new->next = using_directives; |
| 163 | using_directives = new; |
| 164 | } |
| 165 | |
| 166 | /* Record the namespace that the function defined by SYMBOL was |
| 167 | defined in, if necessary. BLOCK is the associated block; use |
| 168 | OBSTACK for allocation. */ |
| 169 | |
| 170 | void |
| 171 | cp_set_block_scope (const struct symbol *symbol, |
| 172 | struct block *block, |
| 173 | struct obstack *obstack, |
| 174 | const char *processing_current_prefix, |
| 175 | int processing_has_namespace_info) |
| 176 | { |
| 177 | if (processing_has_namespace_info) |
| 178 | { |
| 179 | block_set_scope |
| 180 | (block, obsavestring (processing_current_prefix, |
| 181 | strlen (processing_current_prefix), |
| 182 | obstack), |
| 183 | obstack); |
| 184 | } |
| 185 | else if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
| 186 | { |
| 187 | /* Try to figure out the appropriate namespace from the |
| 188 | demangled name. */ |
| 189 | |
| 190 | /* FIXME: carlton/2003-04-15: If the function in question is |
| 191 | a method of a class, the name will actually include the |
| 192 | name of the class as well. This should be harmless, but |
| 193 | is a little unfortunate. */ |
| 194 | |
| 195 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
| 196 | unsigned int prefix_len = cp_entire_prefix_len (name); |
| 197 | |
| 198 | block_set_scope (block, |
| 199 | obsavestring (name, prefix_len, obstack), |
| 200 | obstack); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | /* Test whether or not NAMESPACE looks like it mentions an anonymous |
| 205 | namespace; return nonzero if so. */ |
| 206 | |
| 207 | int |
| 208 | cp_is_anonymous (const char *namespace) |
| 209 | { |
| 210 | return (strstr (namespace, "(anonymous namespace)") |
| 211 | != NULL); |
| 212 | } |
| 213 | |
| 214 | /* The C++-specific version of name lookup for static and global |
| 215 | names. This makes sure that names get looked for in all namespaces |
| 216 | that are in scope. NAME is the natural name of the symbol that |
| 217 | we're looking for, BLOCK is the block that we're searching within, |
| 218 | DOMAIN says what kind of symbols we're looking for, and if SYMTAB |
| 219 | is non-NULL, we should store the symtab where we found the symbol |
| 220 | in it. */ |
| 221 | |
| 222 | struct symbol * |
| 223 | cp_lookup_symbol_nonlocal (const char *name, |
| 224 | const struct block *block, |
| 225 | const domain_enum domain) |
| 226 | { |
| 227 | struct symbol *sym; |
| 228 | const char *scope = block_scope (block); |
| 229 | |
| 230 | sym = lookup_namespace_scope (name, block, |
| 231 | domain, scope, 0); |
| 232 | if (sym != NULL) |
| 233 | return sym; |
| 234 | |
| 235 | return cp_lookup_symbol_namespace (scope, name, |
| 236 | block, domain); |
| 237 | } |
| 238 | |
| 239 | /* Look up NAME in the C++ namespace NAMESPACE. Other arguments are |
| 240 | as in cp_lookup_symbol_nonlocal. */ |
| 241 | |
| 242 | static struct symbol * |
| 243 | cp_lookup_symbol_in_namespace (const char *namespace, |
| 244 | const char *name, |
| 245 | const struct block *block, |
| 246 | const domain_enum domain) |
| 247 | { |
| 248 | if (namespace[0] == '\0') |
| 249 | { |
| 250 | return lookup_symbol_file (name, block, domain, 0); |
| 251 | } |
| 252 | else |
| 253 | { |
| 254 | char *concatenated_name = alloca (strlen (namespace) + 2 |
| 255 | + strlen (name) + 1); |
| 256 | |
| 257 | strcpy (concatenated_name, namespace); |
| 258 | strcat (concatenated_name, "::"); |
| 259 | strcat (concatenated_name, name); |
| 260 | return lookup_symbol_file (concatenated_name, block, domain, |
| 261 | cp_is_anonymous (namespace)); |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | /* Used for cleanups to reset the "searched" flag incase |
| 266 | of an error. */ |
| 267 | |
| 268 | static void |
| 269 | reset_directive_searched (void *data) |
| 270 | { |
| 271 | struct using_direct *direct = data; |
| 272 | direct->searched = 0; |
| 273 | } |
| 274 | |
| 275 | /* Search for NAME by applying all import statements belonging to |
| 276 | BLOCK which are applicable in SCOPE. If DECLARATION_ONLY the |
| 277 | search is restricted to using declarations. |
| 278 | Example: |
| 279 | |
| 280 | namespace A { |
| 281 | int x; |
| 282 | } |
| 283 | using A::x; |
| 284 | |
| 285 | If SEARCH_PARENTS the search will include imports which are |
| 286 | applicable in parents of SCOPE. |
| 287 | Example: |
| 288 | |
| 289 | namespace A { |
| 290 | using namespace X; |
| 291 | namespace B { |
| 292 | using namespace Y; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | If SCOPE is "A::B" and SEARCH_PARENTS is true the imports of |
| 297 | namespaces X and Y will be considered. If SEARCH_PARENTS is false |
| 298 | only the import of Y is considered. */ |
| 299 | |
| 300 | struct symbol * |
| 301 | cp_lookup_symbol_imports (const char *scope, |
| 302 | const char *name, |
| 303 | const struct block *block, |
| 304 | const domain_enum domain, |
| 305 | const int declaration_only, |
| 306 | const int search_parents) |
| 307 | { |
| 308 | struct using_direct *current; |
| 309 | struct symbol *sym = NULL; |
| 310 | int len; |
| 311 | int directive_match; |
| 312 | struct cleanup *searched_cleanup; |
| 313 | |
| 314 | /* First, try to find the symbol in the given namespace. */ |
| 315 | if (!declaration_only) |
| 316 | sym = cp_lookup_symbol_in_namespace (scope, name, |
| 317 | block, domain); |
| 318 | |
| 319 | if (sym != NULL) |
| 320 | return sym; |
| 321 | |
| 322 | /* Go through the using directives. If any of them add new names to |
| 323 | the namespace we're searching in, see if we can find a match by |
| 324 | applying them. */ |
| 325 | |
| 326 | for (current = block_using (block); |
| 327 | current != NULL; |
| 328 | current = current->next) |
| 329 | { |
| 330 | len = strlen (current->import_dest); |
| 331 | directive_match = (search_parents |
| 332 | ? (strncmp (scope, current->import_dest, |
| 333 | strlen (current->import_dest)) == 0 |
| 334 | && (len == 0 |
| 335 | || scope[len] == ':' |
| 336 | || scope[len] == '\0')) |
| 337 | : strcmp (scope, current->import_dest) == 0); |
| 338 | |
| 339 | /* If the import destination is the current scope or one of its |
| 340 | ancestors then it is applicable. */ |
| 341 | if (directive_match && !current->searched) |
| 342 | { |
| 343 | /* Mark this import as searched so that the recursive call |
| 344 | does not search it again. */ |
| 345 | current->searched = 1; |
| 346 | searched_cleanup = make_cleanup (reset_directive_searched, |
| 347 | current); |
| 348 | |
| 349 | /* If there is an import of a single declaration, compare the |
| 350 | imported declaration (after optional renaming by its alias) |
| 351 | with the sought out name. If there is a match pass |
| 352 | current->import_src as NAMESPACE to direct the search |
| 353 | towards the imported namespace. */ |
| 354 | if (current->declaration |
| 355 | && strcmp (name, current->alias |
| 356 | ? current->alias : current->declaration) == 0) |
| 357 | sym = cp_lookup_symbol_in_namespace (current->import_src, |
| 358 | current->declaration, |
| 359 | block, domain); |
| 360 | |
| 361 | /* If this is a DECLARATION_ONLY search or a symbol was found |
| 362 | or this import statement was an import declaration, the |
| 363 | search of this import is complete. */ |
| 364 | if (declaration_only || sym != NULL || current->declaration) |
| 365 | { |
| 366 | current->searched = 0; |
| 367 | discard_cleanups (searched_cleanup); |
| 368 | |
| 369 | if (sym != NULL) |
| 370 | return sym; |
| 371 | |
| 372 | continue; |
| 373 | } |
| 374 | |
| 375 | if (current->alias != NULL |
| 376 | && strcmp (name, current->alias) == 0) |
| 377 | /* If the import is creating an alias and the alias matches |
| 378 | the sought name. Pass current->import_src as the NAME to |
| 379 | direct the search towards the aliased namespace. */ |
| 380 | { |
| 381 | sym = cp_lookup_symbol_in_namespace (scope, |
| 382 | current->import_src, |
| 383 | block, domain); |
| 384 | } |
| 385 | else if (current->alias == NULL) |
| 386 | { |
| 387 | /* If this import statement creates no alias, pass |
| 388 | current->inner as NAMESPACE to direct the search |
| 389 | towards the imported namespace. */ |
| 390 | sym = cp_lookup_symbol_imports (current->import_src, |
| 391 | name, block, |
| 392 | domain, 0, 0); |
| 393 | } |
| 394 | current->searched = 0; |
| 395 | discard_cleanups (searched_cleanup); |
| 396 | |
| 397 | if (sym != NULL) |
| 398 | return sym; |
| 399 | } |
| 400 | } |
| 401 | |
| 402 | return NULL; |
| 403 | } |
| 404 | |
| 405 | /* Helper function that searches an array of symbols for one named |
| 406 | NAME. */ |
| 407 | |
| 408 | static struct symbol * |
| 409 | search_symbol_list (const char *name, int num, |
| 410 | struct symbol **syms) |
| 411 | { |
| 412 | int i; |
| 413 | |
| 414 | /* Maybe we should store a dictionary in here instead. */ |
| 415 | for (i = 0; i < num; ++i) |
| 416 | { |
| 417 | if (strcmp (name, SYMBOL_NATURAL_NAME (syms[i])) == 0) |
| 418 | return syms[i]; |
| 419 | } |
| 420 | return NULL; |
| 421 | } |
| 422 | |
| 423 | /* Like cp_lookup_symbol_imports, but if BLOCK is a function, it |
| 424 | searches through the template parameters of the function and the |
| 425 | function's type. */ |
| 426 | |
| 427 | struct symbol * |
| 428 | cp_lookup_symbol_imports_or_template (const char *scope, |
| 429 | const char *name, |
| 430 | const struct block *block, |
| 431 | const domain_enum domain) |
| 432 | { |
| 433 | struct symbol *function = BLOCK_FUNCTION (block); |
| 434 | |
| 435 | if (function != NULL && SYMBOL_LANGUAGE (function) == language_cplus) |
| 436 | { |
| 437 | int i; |
| 438 | struct cplus_specific *cps |
| 439 | = function->ginfo.language_specific.cplus_specific; |
| 440 | |
| 441 | /* Search the function's template parameters. */ |
| 442 | if (SYMBOL_IS_CPLUS_TEMPLATE_FUNCTION (function)) |
| 443 | { |
| 444 | struct template_symbol *templ |
| 445 | = (struct template_symbol *) function; |
| 446 | struct symbol *result; |
| 447 | |
| 448 | result = search_symbol_list (name, |
| 449 | templ->n_template_arguments, |
| 450 | templ->template_arguments); |
| 451 | if (result != NULL) |
| 452 | return result; |
| 453 | } |
| 454 | |
| 455 | /* Search the template parameters of the function's defining |
| 456 | context. */ |
| 457 | if (SYMBOL_NATURAL_NAME (function)) |
| 458 | { |
| 459 | struct type *context; |
| 460 | char *name_copy = xstrdup (SYMBOL_NATURAL_NAME (function)); |
| 461 | struct cleanup *cleanups = make_cleanup (xfree, name_copy); |
| 462 | const struct language_defn *lang = language_def (language_cplus); |
| 463 | struct gdbarch *arch = SYMBOL_SYMTAB (function)->objfile->gdbarch; |
| 464 | const struct block *parent = BLOCK_SUPERBLOCK (block); |
| 465 | |
| 466 | while (1) |
| 467 | { |
| 468 | struct symbol *result; |
| 469 | unsigned int prefix_len = cp_entire_prefix_len (name_copy); |
| 470 | |
| 471 | if (prefix_len == 0) |
| 472 | context = NULL; |
| 473 | else |
| 474 | { |
| 475 | name_copy[prefix_len] = '\0'; |
| 476 | context = lookup_typename (lang, arch, |
| 477 | name_copy, |
| 478 | parent, 1); |
| 479 | } |
| 480 | |
| 481 | if (context == NULL) |
| 482 | break; |
| 483 | |
| 484 | result |
| 485 | = search_symbol_list (name, |
| 486 | TYPE_N_TEMPLATE_ARGUMENTS (context), |
| 487 | TYPE_TEMPLATE_ARGUMENTS (context)); |
| 488 | if (result != NULL) |
| 489 | return result; |
| 490 | } |
| 491 | |
| 492 | do_cleanups (cleanups); |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | return cp_lookup_symbol_imports (scope, name, block, domain, 1, 1); |
| 497 | } |
| 498 | |
| 499 | /* Searches for NAME in the current namespace, and by applying |
| 500 | relevant import statements belonging to BLOCK and its parents. |
| 501 | SCOPE is the namespace scope of the context in which the search is |
| 502 | being evaluated. */ |
| 503 | |
| 504 | struct symbol* |
| 505 | cp_lookup_symbol_namespace (const char *scope, |
| 506 | const char *name, |
| 507 | const struct block *block, |
| 508 | const domain_enum domain) |
| 509 | { |
| 510 | struct symbol *sym; |
| 511 | |
| 512 | /* First, try to find the symbol in the given namespace. */ |
| 513 | sym = cp_lookup_symbol_in_namespace (scope, name, |
| 514 | block, domain); |
| 515 | if (sym != NULL) |
| 516 | return sym; |
| 517 | |
| 518 | /* Search for name in namespaces imported to this and parent |
| 519 | blocks. */ |
| 520 | while (block != NULL) |
| 521 | { |
| 522 | sym = cp_lookup_symbol_imports (scope, name, block, |
| 523 | domain, 0, 1); |
| 524 | |
| 525 | if (sym) |
| 526 | return sym; |
| 527 | |
| 528 | block = BLOCK_SUPERBLOCK (block); |
| 529 | } |
| 530 | |
| 531 | return NULL; |
| 532 | } |
| 533 | |
| 534 | /* Lookup NAME at namespace scope (or, in C terms, in static and |
| 535 | global variables). SCOPE is the namespace that the current |
| 536 | function is defined within; only consider namespaces whose length |
| 537 | is at least SCOPE_LEN. Other arguments are as in |
| 538 | cp_lookup_symbol_nonlocal. |
| 539 | |
| 540 | For example, if we're within a function A::B::f and looking for a |
| 541 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
| 542 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
| 543 | but with SCOPE_LEN = 1. And then it calls itself with NAME and |
| 544 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for |
| 545 | "A::B::x"; if it doesn't find it, then the second call looks for |
| 546 | "A::x", and if that call fails, then the first call looks for |
| 547 | "x". */ |
| 548 | |
| 549 | static struct symbol * |
| 550 | lookup_namespace_scope (const char *name, |
| 551 | const struct block *block, |
| 552 | const domain_enum domain, |
| 553 | const char *scope, |
| 554 | int scope_len) |
| 555 | { |
| 556 | char *namespace; |
| 557 | |
| 558 | if (scope[scope_len] != '\0') |
| 559 | { |
| 560 | /* Recursively search for names in child namespaces first. */ |
| 561 | |
| 562 | struct symbol *sym; |
| 563 | int new_scope_len = scope_len; |
| 564 | |
| 565 | /* If the current scope is followed by "::", skip past that. */ |
| 566 | if (new_scope_len != 0) |
| 567 | { |
| 568 | gdb_assert (scope[new_scope_len] == ':'); |
| 569 | new_scope_len += 2; |
| 570 | } |
| 571 | new_scope_len += cp_find_first_component (scope + new_scope_len); |
| 572 | sym = lookup_namespace_scope (name, block, domain, |
| 573 | scope, new_scope_len); |
| 574 | if (sym != NULL) |
| 575 | return sym; |
| 576 | } |
| 577 | |
| 578 | /* Okay, we didn't find a match in our children, so look for the |
| 579 | name in the current namespace. */ |
| 580 | |
| 581 | namespace = alloca (scope_len + 1); |
| 582 | strncpy (namespace, scope, scope_len); |
| 583 | namespace[scope_len] = '\0'; |
| 584 | return cp_lookup_symbol_in_namespace (namespace, name, |
| 585 | block, domain); |
| 586 | } |
| 587 | |
| 588 | /* Look up NAME in BLOCK's static block and in global blocks. If |
| 589 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located |
| 590 | within an anonymous namespace. Other arguments are as in |
| 591 | cp_lookup_symbol_nonlocal. */ |
| 592 | |
| 593 | static struct symbol * |
| 594 | lookup_symbol_file (const char *name, |
| 595 | const struct block *block, |
| 596 | const domain_enum domain, |
| 597 | int anonymous_namespace) |
| 598 | { |
| 599 | struct symbol *sym = NULL; |
| 600 | |
| 601 | sym = lookup_symbol_static (name, block, domain); |
| 602 | if (sym != NULL) |
| 603 | return sym; |
| 604 | |
| 605 | if (anonymous_namespace) |
| 606 | { |
| 607 | /* Symbols defined in anonymous namespaces have external linkage |
| 608 | but should be treated as local to a single file nonetheless. |
| 609 | So we only search the current file's global block. */ |
| 610 | |
| 611 | const struct block *global_block = block_global_block (block); |
| 612 | |
| 613 | if (global_block != NULL) |
| 614 | sym = lookup_symbol_aux_block (name, global_block, domain); |
| 615 | } |
| 616 | else |
| 617 | { |
| 618 | sym = lookup_symbol_global (name, block, domain); |
| 619 | } |
| 620 | |
| 621 | return sym; |
| 622 | } |
| 623 | |
| 624 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
| 625 | class or namespace given by PARENT_TYPE, from within the context |
| 626 | given by BLOCK. Return NULL if there is no such nested type. */ |
| 627 | |
| 628 | struct type * |
| 629 | cp_lookup_nested_type (struct type *parent_type, |
| 630 | const char *nested_name, |
| 631 | const struct block *block) |
| 632 | { |
| 633 | /* type_name_no_tag_required provides better error reporting using the |
| 634 | original type. */ |
| 635 | struct type *saved_parent_type = parent_type; |
| 636 | |
| 637 | CHECK_TYPEDEF (parent_type); |
| 638 | |
| 639 | switch (TYPE_CODE (parent_type)) |
| 640 | { |
| 641 | case TYPE_CODE_STRUCT: |
| 642 | case TYPE_CODE_NAMESPACE: |
| 643 | case TYPE_CODE_UNION: |
| 644 | { |
| 645 | /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
| 646 | of classes like, say, data or function members. Instead, |
| 647 | they're just represented by symbols whose names are |
| 648 | qualified by the name of the surrounding class. This is |
| 649 | just like members of namespaces; in particular, |
| 650 | lookup_symbol_namespace works when looking them up. */ |
| 651 | |
| 652 | const char *parent_name = type_name_no_tag_or_error (saved_parent_type); |
| 653 | struct symbol *sym |
| 654 | = cp_lookup_symbol_in_namespace (parent_name, nested_name, |
| 655 | block, VAR_DOMAIN); |
| 656 | char *concatenated_name; |
| 657 | |
| 658 | if (sym != NULL && SYMBOL_CLASS (sym) == LOC_TYPEDEF) |
| 659 | return SYMBOL_TYPE (sym); |
| 660 | |
| 661 | /* Now search all static file-level symbols. Not strictly |
| 662 | correct, but more useful than an error. We do not try to |
| 663 | guess any imported namespace as even the fully specified |
| 664 | namespace seach is is already not C++ compliant and more |
| 665 | assumptions could make it too magic. */ |
| 666 | |
| 667 | concatenated_name = alloca (strlen (parent_name) + 2 |
| 668 | + strlen (nested_name) + 1); |
| 669 | sprintf (concatenated_name, "%s::%s", |
| 670 | parent_name, nested_name); |
| 671 | sym = lookup_static_symbol_aux (concatenated_name, |
| 672 | VAR_DOMAIN); |
| 673 | if (sym != NULL && SYMBOL_CLASS (sym) == LOC_TYPEDEF) |
| 674 | return SYMBOL_TYPE (sym); |
| 675 | |
| 676 | return NULL; |
| 677 | } |
| 678 | default: |
| 679 | internal_error (__FILE__, __LINE__, |
| 680 | _("cp_lookup_nested_type called " |
| 681 | "on a non-aggregate type.")); |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | /* The C++-version of lookup_transparent_type. */ |
| 686 | |
| 687 | /* FIXME: carlton/2004-01-16: The problem that this is trying to |
| 688 | address is that, unfortunately, sometimes NAME is wrong: it may not |
| 689 | include the name of namespaces enclosing the type in question. |
| 690 | lookup_transparent_type gets called when the type in question |
| 691 | is a declaration, and we're trying to find its definition; but, for |
| 692 | declarations, our type name deduction mechanism doesn't work. |
| 693 | There's nothing we can do to fix this in general, I think, in the |
| 694 | absence of debug information about namespaces (I've filed PR |
| 695 | gdb/1511 about this); until such debug information becomes more |
| 696 | prevalent, one heuristic which sometimes looks is to search for the |
| 697 | definition in namespaces containing the current namespace. |
| 698 | |
| 699 | We should delete this functions once the appropriate debug |
| 700 | information becomes more widespread. (GCC 3.4 will be the first |
| 701 | released version of GCC with such information.) */ |
| 702 | |
| 703 | struct type * |
| 704 | cp_lookup_transparent_type (const char *name) |
| 705 | { |
| 706 | /* First, try the honest way of looking up the definition. */ |
| 707 | struct type *t = basic_lookup_transparent_type (name); |
| 708 | const char *scope; |
| 709 | |
| 710 | if (t != NULL) |
| 711 | return t; |
| 712 | |
| 713 | /* If that doesn't work and we're within a namespace, look there |
| 714 | instead. */ |
| 715 | scope = block_scope (get_selected_block (0)); |
| 716 | |
| 717 | if (scope[0] == '\0') |
| 718 | return NULL; |
| 719 | |
| 720 | return cp_lookup_transparent_type_loop (name, scope, 0); |
| 721 | } |
| 722 | |
| 723 | /* Lookup the type definition associated to NAME in namespaces/classes |
| 724 | containing SCOPE whose name is strictly longer than LENGTH. LENGTH |
| 725 | must be the index of the start of a component of SCOPE. */ |
| 726 | |
| 727 | static struct type * |
| 728 | cp_lookup_transparent_type_loop (const char *name, |
| 729 | const char *scope, |
| 730 | int length) |
| 731 | { |
| 732 | int scope_length = length + cp_find_first_component (scope + length); |
| 733 | char *full_name; |
| 734 | |
| 735 | /* If the current scope is followed by "::", look in the next |
| 736 | component. */ |
| 737 | if (scope[scope_length] == ':') |
| 738 | { |
| 739 | struct type *retval |
| 740 | = cp_lookup_transparent_type_loop (name, scope, |
| 741 | scope_length + 2); |
| 742 | |
| 743 | if (retval != NULL) |
| 744 | return retval; |
| 745 | } |
| 746 | |
| 747 | full_name = alloca (scope_length + 2 + strlen (name) + 1); |
| 748 | strncpy (full_name, scope, scope_length); |
| 749 | strncpy (full_name + scope_length, "::", 2); |
| 750 | strcpy (full_name + scope_length + 2, name); |
| 751 | |
| 752 | return basic_lookup_transparent_type (full_name); |
| 753 | } |
| 754 | |
| 755 | /* This used to do something but was removed when it became |
| 756 | obsolete. */ |
| 757 | |
| 758 | static void |
| 759 | maintenance_cplus_namespace (char *args, int from_tty) |
| 760 | { |
| 761 | printf_unfiltered (_("The `maint namespace' command was removed.\n")); |
| 762 | } |
| 763 | |
| 764 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 765 | extern initialize_file_ftype _initialize_cp_namespace; |
| 766 | |
| 767 | void |
| 768 | _initialize_cp_namespace (void) |
| 769 | { |
| 770 | struct cmd_list_element *cmd; |
| 771 | |
| 772 | cmd = add_cmd ("namespace", class_maintenance, |
| 773 | maintenance_cplus_namespace, |
| 774 | _("Deprecated placeholder for removed functionality."), |
| 775 | &maint_cplus_cmd_list); |
| 776 | deprecate_cmd (cmd, NULL); |
| 777 | } |