| 1 | /* Helper routines for C++ support in GDB. |
| 2 | Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010 |
| 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 | |
| 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 | |
| 47 | static struct type *cp_lookup_transparent_type_loop (const char *name, |
| 48 | const char *scope, |
| 49 | int scope_len); |
| 50 | |
| 51 | static void initialize_namespace_symtab (struct objfile *objfile); |
| 52 | |
| 53 | static struct block *get_possible_namespace_block (struct objfile *objfile); |
| 54 | |
| 55 | static void free_namespace_block (struct symtab *symtab); |
| 56 | |
| 57 | static int check_possible_namespace_symbols_loop (const char *name, |
| 58 | int len, |
| 59 | struct objfile *objfile); |
| 60 | |
| 61 | static int check_one_possible_namespace_symbol (const char *name, |
| 62 | int len, |
| 63 | struct objfile *objfile); |
| 64 | |
| 65 | static struct symbol *lookup_possible_namespace_symbol (const char *name); |
| 66 | |
| 67 | static void maintenance_cplus_namespace (char *args, int from_tty); |
| 68 | |
| 69 | /* Check to see if SYMBOL refers to an object contained within an |
| 70 | anonymous namespace; if so, add an appropriate using directive. */ |
| 71 | |
| 72 | /* Optimize away strlen ("(anonymous namespace)"). */ |
| 73 | |
| 74 | #define ANONYMOUS_NAMESPACE_LEN 21 |
| 75 | |
| 76 | void |
| 77 | cp_scan_for_anonymous_namespaces (const struct symbol *symbol) |
| 78 | { |
| 79 | if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
| 80 | { |
| 81 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
| 82 | unsigned int previous_component; |
| 83 | unsigned int next_component; |
| 84 | const char *len; |
| 85 | |
| 86 | /* Start with a quick-and-dirty check for mention of "(anonymous |
| 87 | namespace)". */ |
| 88 | |
| 89 | if (!cp_is_anonymous (name)) |
| 90 | return; |
| 91 | |
| 92 | previous_component = 0; |
| 93 | next_component = cp_find_first_component (name + previous_component); |
| 94 | |
| 95 | while (name[next_component] == ':') |
| 96 | { |
| 97 | if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN |
| 98 | && strncmp (name + previous_component, |
| 99 | "(anonymous namespace)", |
| 100 | ANONYMOUS_NAMESPACE_LEN) == 0) |
| 101 | { |
| 102 | int dest_len = (previous_component == 0 ? 0 : previous_component - 2); |
| 103 | int src_len = next_component; |
| 104 | |
| 105 | char *dest = alloca (dest_len + 1); |
| 106 | char *src = alloca (src_len + 1); |
| 107 | |
| 108 | memcpy (dest, name, dest_len); |
| 109 | memcpy (src, name, src_len); |
| 110 | |
| 111 | dest[dest_len] = '\0'; |
| 112 | src[src_len] = '\0'; |
| 113 | |
| 114 | /* We've found a component of the name that's an |
| 115 | anonymous namespace. So add symbols in it to the |
| 116 | namespace given by the previous component if there is |
| 117 | one, or to the global namespace if there isn't. */ |
| 118 | cp_add_using_directive (dest, src, NULL, NULL, |
| 119 | &SYMBOL_SYMTAB (symbol)->objfile->objfile_obstack); |
| 120 | } |
| 121 | /* The "+ 2" is for the "::". */ |
| 122 | previous_component = next_component + 2; |
| 123 | next_component = (previous_component |
| 124 | + cp_find_first_component (name |
| 125 | + previous_component)); |
| 126 | } |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | |
| 131 | /* Add a using directive to using_directives. If the using directive in |
| 132 | question has already been added, don't add it twice. |
| 133 | Create a new struct using_direct which imports the namespace SRC into the |
| 134 | scope DEST. ALIAS is the name of the imported namespace in the current |
| 135 | scope. If ALIAS is NULL then the namespace is known by its original name. |
| 136 | DECLARATION is the name if the imported varable if this is a declaration |
| 137 | import (Eg. using A::x), otherwise it is NULL. The arguments are copied |
| 138 | into newly allocated memory so they can be temporaries. */ |
| 139 | |
| 140 | void |
| 141 | cp_add_using_directive (const char *dest, |
| 142 | const char *src, |
| 143 | const char *alias, |
| 144 | const char *declaration, |
| 145 | struct obstack *obstack) |
| 146 | { |
| 147 | struct using_direct *current; |
| 148 | struct using_direct *new; |
| 149 | |
| 150 | /* Has it already been added? */ |
| 151 | |
| 152 | for (current = using_directives; current != NULL; current = current->next) |
| 153 | { |
| 154 | if (strcmp (current->import_src, src) == 0 |
| 155 | && strcmp (current->import_dest, dest) == 0 |
| 156 | && ((alias == NULL && current->alias == NULL) |
| 157 | || (alias != NULL && current->alias != NULL |
| 158 | && strcmp (alias, current->alias) == 0)) |
| 159 | && ((declaration == NULL && current->declaration == NULL) |
| 160 | || (declaration != NULL && current->declaration != NULL |
| 161 | && strcmp (declaration, current->declaration) == 0))) |
| 162 | return; |
| 163 | } |
| 164 | |
| 165 | new = OBSTACK_ZALLOC (obstack, struct using_direct); |
| 166 | |
| 167 | new->import_src = obsavestring (src, strlen (src), obstack); |
| 168 | new->import_dest = obsavestring (dest, strlen (dest), obstack); |
| 169 | |
| 170 | if (alias != NULL) |
| 171 | new->alias = obsavestring (alias, strlen (alias), obstack); |
| 172 | |
| 173 | if (declaration != NULL) |
| 174 | new->declaration = obsavestring (declaration, strlen (declaration), |
| 175 | obstack); |
| 176 | |
| 177 | new->next = using_directives; |
| 178 | using_directives = new; |
| 179 | } |
| 180 | |
| 181 | /* Record the namespace that the function defined by SYMBOL was |
| 182 | defined in, if necessary. BLOCK is the associated block; use |
| 183 | OBSTACK for allocation. */ |
| 184 | |
| 185 | void |
| 186 | cp_set_block_scope (const struct symbol *symbol, |
| 187 | struct block *block, |
| 188 | struct obstack *obstack, |
| 189 | const char *processing_current_prefix, |
| 190 | int processing_has_namespace_info) |
| 191 | { |
| 192 | if (processing_has_namespace_info) |
| 193 | { |
| 194 | block_set_scope |
| 195 | (block, obsavestring (processing_current_prefix, |
| 196 | strlen (processing_current_prefix), |
| 197 | obstack), |
| 198 | obstack); |
| 199 | } |
| 200 | else if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
| 201 | { |
| 202 | /* Try to figure out the appropriate namespace from the |
| 203 | demangled name. */ |
| 204 | |
| 205 | /* FIXME: carlton/2003-04-15: If the function in question is |
| 206 | a method of a class, the name will actually include the |
| 207 | name of the class as well. This should be harmless, but |
| 208 | is a little unfortunate. */ |
| 209 | |
| 210 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
| 211 | unsigned int prefix_len = cp_entire_prefix_len (name); |
| 212 | |
| 213 | block_set_scope (block, |
| 214 | obsavestring (name, prefix_len, obstack), |
| 215 | obstack); |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | /* Test whether or not NAMESPACE looks like it mentions an anonymous |
| 220 | namespace; return nonzero if so. */ |
| 221 | |
| 222 | int |
| 223 | cp_is_anonymous (const char *namespace) |
| 224 | { |
| 225 | return (strstr (namespace, "(anonymous namespace)") |
| 226 | != NULL); |
| 227 | } |
| 228 | |
| 229 | /* The C++-specific version of name lookup for static and global |
| 230 | names. This makes sure that names get looked for in all namespaces |
| 231 | that are in scope. NAME is the natural name of the symbol that |
| 232 | we're looking for, BLOCK is the block that we're searching within, |
| 233 | DOMAIN says what kind of symbols we're looking for, and if SYMTAB is |
| 234 | non-NULL, we should store the symtab where we found the symbol in it. */ |
| 235 | |
| 236 | struct symbol * |
| 237 | cp_lookup_symbol_nonlocal (const char *name, |
| 238 | const struct block *block, |
| 239 | const domain_enum domain) |
| 240 | { |
| 241 | struct symbol *sym; |
| 242 | const char *scope = block_scope (block); |
| 243 | |
| 244 | sym = lookup_namespace_scope (name, block, domain, scope, 0); |
| 245 | if (sym != NULL) |
| 246 | return sym; |
| 247 | |
| 248 | return cp_lookup_symbol_namespace (scope, name, block, domain); |
| 249 | } |
| 250 | |
| 251 | /* Look up NAME in the C++ namespace NAMESPACE. Other arguments are as in |
| 252 | cp_lookup_symbol_nonlocal. */ |
| 253 | |
| 254 | static struct symbol * |
| 255 | cp_lookup_symbol_in_namespace (const char *namespace, |
| 256 | const char *name, |
| 257 | const struct block *block, |
| 258 | const domain_enum domain) |
| 259 | { |
| 260 | if (namespace[0] == '\0') |
| 261 | { |
| 262 | return lookup_symbol_file (name, block, domain, 0); |
| 263 | } |
| 264 | else |
| 265 | { |
| 266 | char *concatenated_name = alloca (strlen (namespace) + 2 + |
| 267 | strlen (name) + 1); |
| 268 | strcpy (concatenated_name, namespace); |
| 269 | strcat (concatenated_name, "::"); |
| 270 | strcat (concatenated_name, name); |
| 271 | return lookup_symbol_file (concatenated_name, block, |
| 272 | domain, cp_is_anonymous (namespace)); |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | /* Used for cleanups to reset the "searched" flag incase |
| 277 | of an error. */ |
| 278 | |
| 279 | static void |
| 280 | reset_directive_searched (void *data) |
| 281 | { |
| 282 | struct using_direct *direct = data; |
| 283 | direct->searched = 0; |
| 284 | } |
| 285 | |
| 286 | /* Search for NAME by applying all import statements belonging |
| 287 | to BLOCK which are applicable in SCOPE. If DECLARATION_ONLY the search |
| 288 | is restricted to using declarations. |
| 289 | Example: |
| 290 | |
| 291 | namespace A{ |
| 292 | int x; |
| 293 | } |
| 294 | using A::x; |
| 295 | |
| 296 | If SEARCH_PARENTS the search will include imports which are applicable in |
| 297 | parents of SCOPE. |
| 298 | Example: |
| 299 | |
| 300 | namespace A{ |
| 301 | using namespace X; |
| 302 | namespace B{ |
| 303 | using namespace Y; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | If SCOPE is "A::B" and SEARCH_PARENTS is true the imports of namespaces X |
| 308 | and Y will be considered. If SEARCH_PARENTS is false only the import of Y |
| 309 | is considered. */ |
| 310 | |
| 311 | struct symbol * |
| 312 | cp_lookup_symbol_imports (const char *scope, |
| 313 | const char *name, |
| 314 | const struct block *block, |
| 315 | const domain_enum domain, |
| 316 | const int declaration_only, |
| 317 | const int search_parents) |
| 318 | { |
| 319 | struct using_direct *current; |
| 320 | struct symbol *sym = NULL; |
| 321 | int len; |
| 322 | int directive_match; |
| 323 | struct cleanup *searched_cleanup; |
| 324 | |
| 325 | /* First, try to find the symbol in the given namespace. */ |
| 326 | if (!declaration_only) |
| 327 | sym = cp_lookup_symbol_in_namespace (scope, name, block, domain); |
| 328 | |
| 329 | if (sym != NULL) |
| 330 | return sym; |
| 331 | |
| 332 | /* Go through the using directives. If any of them add new |
| 333 | names to the namespace we're searching in, see if we can find a |
| 334 | match by applying them. */ |
| 335 | |
| 336 | for (current = block_using (block); |
| 337 | current != NULL; |
| 338 | current = current->next) |
| 339 | { |
| 340 | len = strlen (current->import_dest); |
| 341 | directive_match = (search_parents |
| 342 | ? (strncmp (scope, current->import_dest, |
| 343 | strlen (current->import_dest)) == 0 |
| 344 | && (len == 0 |
| 345 | || scope[len] == ':' || scope[len] == '\0')) |
| 346 | : strcmp (scope, current->import_dest) == 0); |
| 347 | |
| 348 | /* If the import destination is the current scope or one of its ancestors then |
| 349 | it is applicable. */ |
| 350 | if (directive_match && !current->searched) |
| 351 | { |
| 352 | /* Mark this import as searched so that the recursive call does not |
| 353 | search it again. */ |
| 354 | current->searched = 1; |
| 355 | searched_cleanup = make_cleanup (reset_directive_searched, current); |
| 356 | |
| 357 | /* If there is an import of a single declaration, compare the imported |
| 358 | declaration with the sought out name. If there is a match pass |
| 359 | current->import_src as NAMESPACE to direct the search towards the |
| 360 | imported namespace. */ |
| 361 | if (current->declaration && strcmp (name, current->declaration) == 0) |
| 362 | sym = cp_lookup_symbol_in_namespace (current->import_src, |
| 363 | name, |
| 364 | block, |
| 365 | domain); |
| 366 | |
| 367 | /* If this is a DECLARATION_ONLY search or a symbol was found or |
| 368 | this import statement was an import declaration, the search |
| 369 | of this import is complete. */ |
| 370 | if (declaration_only || sym != NULL || current->declaration) |
| 371 | { |
| 372 | current->searched = 0; |
| 373 | discard_cleanups (searched_cleanup); |
| 374 | |
| 375 | if (sym != NULL) |
| 376 | return sym; |
| 377 | |
| 378 | continue; |
| 379 | } |
| 380 | |
| 381 | if (current->alias != NULL && strcmp (name, current->alias) == 0) |
| 382 | /* If the import is creating an alias and the alias matches the |
| 383 | sought name. Pass current->import_src as the NAME to direct the |
| 384 | search towards the aliased namespace. */ |
| 385 | { |
| 386 | sym = cp_lookup_symbol_in_namespace (scope, |
| 387 | current->import_src, |
| 388 | block, |
| 389 | domain); |
| 390 | } |
| 391 | else if (current->alias == NULL) |
| 392 | { |
| 393 | /* If this import statement creates no alias, pass current->inner as |
| 394 | NAMESPACE to direct the search towards the imported namespace. */ |
| 395 | sym = cp_lookup_symbol_imports (current->import_src, |
| 396 | name, |
| 397 | block, |
| 398 | domain, |
| 399 | 0, |
| 400 | 0); |
| 401 | } |
| 402 | current->searched = 0; |
| 403 | discard_cleanups (searched_cleanup); |
| 404 | |
| 405 | if (sym != NULL) |
| 406 | return sym; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | return NULL; |
| 411 | } |
| 412 | |
| 413 | /* Searches for NAME in the current namespace, and by applying relevant import |
| 414 | statements belonging to BLOCK and its parents. SCOPE is the namespace scope |
| 415 | of the context in which the search is being evaluated. */ |
| 416 | |
| 417 | struct symbol* |
| 418 | cp_lookup_symbol_namespace (const char *scope, |
| 419 | const char *name, |
| 420 | const struct block *block, |
| 421 | const domain_enum domain) |
| 422 | { |
| 423 | struct symbol *sym; |
| 424 | |
| 425 | /* First, try to find the symbol in the given namespace. */ |
| 426 | sym = cp_lookup_symbol_in_namespace (scope, name, block, domain); |
| 427 | if (sym != NULL) |
| 428 | return sym; |
| 429 | |
| 430 | /* Search for name in namespaces imported to this and parent blocks. */ |
| 431 | while (block != NULL) |
| 432 | { |
| 433 | sym = cp_lookup_symbol_imports (scope, name, block, domain, 0, 1); |
| 434 | |
| 435 | if (sym) |
| 436 | return sym; |
| 437 | |
| 438 | block = BLOCK_SUPERBLOCK (block); |
| 439 | } |
| 440 | |
| 441 | return NULL; |
| 442 | } |
| 443 | |
| 444 | /* Lookup NAME at namespace scope (or, in C terms, in static and |
| 445 | global variables). SCOPE is the namespace that the current |
| 446 | function is defined within; only consider namespaces whose length |
| 447 | is at least SCOPE_LEN. Other arguments are as in |
| 448 | cp_lookup_symbol_nonlocal. |
| 449 | |
| 450 | For example, if we're within a function A::B::f and looking for a |
| 451 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
| 452 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
| 453 | but with SCOPE_LEN = 1. And then it calls itself with NAME and |
| 454 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for |
| 455 | "A::B::x"; if it doesn't find it, then the second call looks for |
| 456 | "A::x", and if that call fails, then the first call looks for |
| 457 | "x". */ |
| 458 | |
| 459 | static struct symbol * |
| 460 | lookup_namespace_scope (const char *name, |
| 461 | const struct block *block, |
| 462 | const domain_enum domain, |
| 463 | const char *scope, |
| 464 | int scope_len) |
| 465 | { |
| 466 | char *namespace; |
| 467 | |
| 468 | if (scope[scope_len] != '\0') |
| 469 | { |
| 470 | /* Recursively search for names in child namespaces first. */ |
| 471 | |
| 472 | struct symbol *sym; |
| 473 | int new_scope_len = scope_len; |
| 474 | |
| 475 | /* If the current scope is followed by "::", skip past that. */ |
| 476 | if (new_scope_len != 0) |
| 477 | { |
| 478 | gdb_assert (scope[new_scope_len] == ':'); |
| 479 | new_scope_len += 2; |
| 480 | } |
| 481 | new_scope_len += cp_find_first_component (scope + new_scope_len); |
| 482 | sym = lookup_namespace_scope (name, block, domain, scope, new_scope_len); |
| 483 | if (sym != NULL) |
| 484 | return sym; |
| 485 | } |
| 486 | |
| 487 | /* Okay, we didn't find a match in our children, so look for the |
| 488 | name in the current namespace. */ |
| 489 | |
| 490 | namespace = alloca (scope_len + 1); |
| 491 | strncpy (namespace, scope, scope_len); |
| 492 | namespace[scope_len] = '\0'; |
| 493 | return cp_lookup_symbol_in_namespace (namespace, name, block, domain); |
| 494 | } |
| 495 | |
| 496 | /* Look up NAME in BLOCK's static block and in global blocks. If |
| 497 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located |
| 498 | within an anonymous namespace. Other arguments are as in |
| 499 | cp_lookup_symbol_nonlocal. */ |
| 500 | |
| 501 | static struct symbol * |
| 502 | lookup_symbol_file (const char *name, |
| 503 | const struct block *block, |
| 504 | const domain_enum domain, |
| 505 | int anonymous_namespace) |
| 506 | { |
| 507 | struct symbol *sym = NULL; |
| 508 | |
| 509 | sym = lookup_symbol_static (name, block, domain); |
| 510 | if (sym != NULL) |
| 511 | return sym; |
| 512 | |
| 513 | if (anonymous_namespace) |
| 514 | { |
| 515 | /* Symbols defined in anonymous namespaces have external linkage |
| 516 | but should be treated as local to a single file nonetheless. |
| 517 | So we only search the current file's global block. */ |
| 518 | |
| 519 | const struct block *global_block = block_global_block (block); |
| 520 | |
| 521 | if (global_block != NULL) |
| 522 | sym = lookup_symbol_aux_block (name, global_block, domain); |
| 523 | } |
| 524 | else |
| 525 | { |
| 526 | sym = lookup_symbol_global (name, block, domain); |
| 527 | } |
| 528 | |
| 529 | if (sym != NULL) |
| 530 | return sym; |
| 531 | |
| 532 | /* Now call "lookup_possible_namespace_symbol". Symbols in here |
| 533 | claim to be associated to namespaces, but this claim might be |
| 534 | incorrect: the names in question might actually correspond to |
| 535 | classes instead of namespaces. But if they correspond to |
| 536 | classes, then we should have found a match for them above. So if |
| 537 | we find them now, they should be genuine. */ |
| 538 | |
| 539 | /* FIXME: carlton/2003-06-12: This is a hack and should eventually |
| 540 | be deleted: see comments below. */ |
| 541 | |
| 542 | if (domain == VAR_DOMAIN) |
| 543 | { |
| 544 | sym = lookup_possible_namespace_symbol (name); |
| 545 | if (sym != NULL) |
| 546 | return sym; |
| 547 | } |
| 548 | |
| 549 | return NULL; |
| 550 | } |
| 551 | |
| 552 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
| 553 | class or namespace given by PARENT_TYPE, from within the context |
| 554 | given by BLOCK. Return NULL if there is no such nested type. */ |
| 555 | |
| 556 | struct type * |
| 557 | cp_lookup_nested_type (struct type *parent_type, |
| 558 | const char *nested_name, |
| 559 | const struct block *block) |
| 560 | { |
| 561 | switch (TYPE_CODE (parent_type)) |
| 562 | { |
| 563 | case TYPE_CODE_STRUCT: |
| 564 | case TYPE_CODE_NAMESPACE: |
| 565 | case TYPE_CODE_UNION: |
| 566 | { |
| 567 | /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
| 568 | of classes like, say, data or function members. Instead, |
| 569 | they're just represented by symbols whose names are |
| 570 | qualified by the name of the surrounding class. This is |
| 571 | just like members of namespaces; in particular, |
| 572 | lookup_symbol_namespace works when looking them up. */ |
| 573 | |
| 574 | const char *parent_name = TYPE_TAG_NAME (parent_type); |
| 575 | struct symbol *sym = cp_lookup_symbol_in_namespace (parent_name, |
| 576 | nested_name, |
| 577 | block, |
| 578 | VAR_DOMAIN); |
| 579 | if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF) |
| 580 | return NULL; |
| 581 | else |
| 582 | return SYMBOL_TYPE (sym); |
| 583 | } |
| 584 | default: |
| 585 | internal_error (__FILE__, __LINE__, |
| 586 | _("cp_lookup_nested_type called on a non-aggregate type.")); |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | /* The C++-version of lookup_transparent_type. */ |
| 591 | |
| 592 | /* FIXME: carlton/2004-01-16: The problem that this is trying to |
| 593 | address is that, unfortunately, sometimes NAME is wrong: it may not |
| 594 | include the name of namespaces enclosing the type in question. |
| 595 | lookup_transparent_type gets called when the the type in question |
| 596 | is a declaration, and we're trying to find its definition; but, for |
| 597 | declarations, our type name deduction mechanism doesn't work. |
| 598 | There's nothing we can do to fix this in general, I think, in the |
| 599 | absence of debug information about namespaces (I've filed PR |
| 600 | gdb/1511 about this); until such debug information becomes more |
| 601 | prevalent, one heuristic which sometimes looks is to search for the |
| 602 | definition in namespaces containing the current namespace. |
| 603 | |
| 604 | We should delete this functions once the appropriate debug |
| 605 | information becomes more widespread. (GCC 3.4 will be the first |
| 606 | released version of GCC with such information.) */ |
| 607 | |
| 608 | struct type * |
| 609 | cp_lookup_transparent_type (const char *name) |
| 610 | { |
| 611 | /* First, try the honest way of looking up the definition. */ |
| 612 | struct type *t = basic_lookup_transparent_type (name); |
| 613 | const char *scope; |
| 614 | |
| 615 | if (t != NULL) |
| 616 | return t; |
| 617 | |
| 618 | /* If that doesn't work and we're within a namespace, look there |
| 619 | instead. */ |
| 620 | scope = block_scope (get_selected_block (0)); |
| 621 | |
| 622 | if (scope[0] == '\0') |
| 623 | return NULL; |
| 624 | |
| 625 | return cp_lookup_transparent_type_loop (name, scope, 0); |
| 626 | } |
| 627 | |
| 628 | /* Lookup the the type definition associated to NAME in |
| 629 | namespaces/classes containing SCOPE whose name is strictly longer |
| 630 | than LENGTH. LENGTH must be the index of the start of a |
| 631 | component of SCOPE. */ |
| 632 | |
| 633 | static struct type * |
| 634 | cp_lookup_transparent_type_loop (const char *name, const char *scope, |
| 635 | int length) |
| 636 | { |
| 637 | int scope_length = length + cp_find_first_component (scope + length); |
| 638 | char *full_name; |
| 639 | |
| 640 | /* If the current scope is followed by "::", look in the next |
| 641 | component. */ |
| 642 | if (scope[scope_length] == ':') |
| 643 | { |
| 644 | struct type *retval |
| 645 | = cp_lookup_transparent_type_loop (name, scope, scope_length + 2); |
| 646 | if (retval != NULL) |
| 647 | return retval; |
| 648 | } |
| 649 | |
| 650 | full_name = alloca (scope_length + 2 + strlen (name) + 1); |
| 651 | strncpy (full_name, scope, scope_length); |
| 652 | strncpy (full_name + scope_length, "::", 2); |
| 653 | strcpy (full_name + scope_length + 2, name); |
| 654 | |
| 655 | return basic_lookup_transparent_type (full_name); |
| 656 | } |
| 657 | |
| 658 | /* Now come functions for dealing with symbols associated to |
| 659 | namespaces. (They're used to store the namespaces themselves, not |
| 660 | objects that live in the namespaces.) These symbols come in two |
| 661 | varieties: if we run into a DW_TAG_namespace DIE, then we know that |
| 662 | we have a namespace, so dwarf2read.c creates a symbol for it just |
| 663 | like normal. But, unfortunately, versions of GCC through at least |
| 664 | 3.3 don't generate those DIE's. Our solution is to try to guess |
| 665 | their existence by looking at demangled names. This might cause us |
| 666 | to misidentify classes as namespaces, however. So we put those |
| 667 | symbols in a special block (one per objfile), and we only search |
| 668 | that block as a last resort. */ |
| 669 | |
| 670 | /* FIXME: carlton/2003-06-12: Once versions of GCC that generate |
| 671 | DW_TAG_namespace have been out for a year or two, we should get rid |
| 672 | of all of this "possible namespace" nonsense. */ |
| 673 | |
| 674 | /* Allocate everything necessary for the possible namespace block |
| 675 | associated to OBJFILE. */ |
| 676 | |
| 677 | static void |
| 678 | initialize_namespace_symtab (struct objfile *objfile) |
| 679 | { |
| 680 | struct symtab *namespace_symtab; |
| 681 | struct blockvector *bv; |
| 682 | struct block *bl; |
| 683 | |
| 684 | namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); |
| 685 | namespace_symtab->language = language_cplus; |
| 686 | namespace_symtab->free_code = free_nothing; |
| 687 | namespace_symtab->dirname = NULL; |
| 688 | |
| 689 | bv = obstack_alloc (&objfile->objfile_obstack, |
| 690 | sizeof (struct blockvector) |
| 691 | + FIRST_LOCAL_BLOCK * sizeof (struct block *)); |
| 692 | BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; |
| 693 | BLOCKVECTOR (namespace_symtab) = bv; |
| 694 | |
| 695 | /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ |
| 696 | |
| 697 | bl = allocate_block (&objfile->objfile_obstack); |
| 698 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, |
| 699 | NULL); |
| 700 | BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; |
| 701 | bl = allocate_block (&objfile->objfile_obstack); |
| 702 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, |
| 703 | NULL); |
| 704 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; |
| 705 | |
| 706 | /* Allocate the possible namespace block; we put it where the first |
| 707 | local block will live, though I don't think there's any need to |
| 708 | pretend that it's actually a local block (e.g. by setting |
| 709 | BLOCK_SUPERBLOCK appropriately). We don't use the global or |
| 710 | static block because we don't want it searched during the normal |
| 711 | search of all global/static blocks in lookup_symbol: we only want |
| 712 | it used as a last resort. */ |
| 713 | |
| 714 | /* NOTE: carlton/2003-09-11: I considered not associating the fake |
| 715 | symbols to a block/symtab at all. But that would cause problems |
| 716 | with lookup_symbol's SYMTAB argument and with block_found, so |
| 717 | having a symtab/block for this purpose seems like the best |
| 718 | solution for now. */ |
| 719 | |
| 720 | bl = allocate_block (&objfile->objfile_obstack); |
| 721 | BLOCK_DICT (bl) = dict_create_hashed_expandable (); |
| 722 | BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; |
| 723 | |
| 724 | namespace_symtab->free_func = free_namespace_block; |
| 725 | |
| 726 | objfile->cp_namespace_symtab = namespace_symtab; |
| 727 | } |
| 728 | |
| 729 | /* Locate the possible namespace block associated to OBJFILE, |
| 730 | allocating it if necessary. */ |
| 731 | |
| 732 | static struct block * |
| 733 | get_possible_namespace_block (struct objfile *objfile) |
| 734 | { |
| 735 | if (objfile->cp_namespace_symtab == NULL) |
| 736 | initialize_namespace_symtab (objfile); |
| 737 | |
| 738 | return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), |
| 739 | FIRST_LOCAL_BLOCK); |
| 740 | } |
| 741 | |
| 742 | /* Free the dictionary associated to the possible namespace block. */ |
| 743 | |
| 744 | static void |
| 745 | free_namespace_block (struct symtab *symtab) |
| 746 | { |
| 747 | struct block *possible_namespace_block; |
| 748 | |
| 749 | possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), |
| 750 | FIRST_LOCAL_BLOCK); |
| 751 | gdb_assert (possible_namespace_block != NULL); |
| 752 | dict_free (BLOCK_DICT (possible_namespace_block)); |
| 753 | } |
| 754 | |
| 755 | /* Ensure that there are symbols in the possible namespace block |
| 756 | associated to OBJFILE for all initial substrings of NAME that look |
| 757 | like namespaces or classes. NAME should end in a member variable: |
| 758 | it shouldn't consist solely of namespaces. */ |
| 759 | |
| 760 | void |
| 761 | cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) |
| 762 | { |
| 763 | check_possible_namespace_symbols_loop (name, |
| 764 | cp_find_first_component (name), |
| 765 | objfile); |
| 766 | } |
| 767 | |
| 768 | /* This is a helper loop for cp_check_possible_namespace_symbols; it |
| 769 | ensures that there are symbols in the possible namespace block |
| 770 | associated to OBJFILE for all namespaces that are initial |
| 771 | substrings of NAME of length at least LEN. It returns 1 if a |
| 772 | previous loop had already created the shortest such symbol and 0 |
| 773 | otherwise. |
| 774 | |
| 775 | This function assumes that if there is already a symbol associated |
| 776 | to a substring of NAME of a given length, then there are already |
| 777 | symbols associated to all substrings of NAME whose length is less |
| 778 | than that length. So if cp_check_possible_namespace_symbols has |
| 779 | been called once with argument "A::B::C::member", then that will |
| 780 | create symbols "A", "A::B", and "A::B::C". If it is then later |
| 781 | called with argument "A::B::D::member", then the new call will |
| 782 | generate a new symbol for "A::B::D", but once it sees that "A::B" |
| 783 | has already been created, it doesn't bother checking to see if "A" |
| 784 | has also been created. */ |
| 785 | |
| 786 | static int |
| 787 | check_possible_namespace_symbols_loop (const char *name, int len, |
| 788 | struct objfile *objfile) |
| 789 | { |
| 790 | if (name[len] == ':') |
| 791 | { |
| 792 | int done; |
| 793 | int next_len = len + 2; |
| 794 | |
| 795 | next_len += cp_find_first_component (name + next_len); |
| 796 | done = check_possible_namespace_symbols_loop (name, next_len, |
| 797 | objfile); |
| 798 | |
| 799 | if (!done) |
| 800 | done = check_one_possible_namespace_symbol (name, len, objfile); |
| 801 | |
| 802 | return done; |
| 803 | } |
| 804 | else |
| 805 | return 0; |
| 806 | } |
| 807 | |
| 808 | /* Check to see if there's already a possible namespace symbol in |
| 809 | OBJFILE whose name is the initial substring of NAME of length LEN. |
| 810 | If not, create one and return 0; otherwise, return 1. */ |
| 811 | |
| 812 | static int |
| 813 | check_one_possible_namespace_symbol (const char *name, int len, |
| 814 | struct objfile *objfile) |
| 815 | { |
| 816 | struct block *block = get_possible_namespace_block (objfile); |
| 817 | char *name_copy = alloca (len + 1); |
| 818 | struct symbol *sym; |
| 819 | |
| 820 | memcpy (name_copy, name, len); |
| 821 | name_copy[len] = '\0'; |
| 822 | sym = lookup_block_symbol (block, name_copy, VAR_DOMAIN); |
| 823 | |
| 824 | if (sym == NULL) |
| 825 | { |
| 826 | struct type *type; |
| 827 | |
| 828 | type = init_type (TYPE_CODE_NAMESPACE, 0, 0, name_copy, objfile); |
| 829 | |
| 830 | TYPE_TAG_NAME (type) = TYPE_NAME (type); |
| 831 | |
| 832 | sym = obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); |
| 833 | memset (sym, 0, sizeof (struct symbol)); |
| 834 | SYMBOL_LANGUAGE (sym) = language_cplus; |
| 835 | /* Note that init_type copied the name to the objfile's |
| 836 | obstack. */ |
| 837 | SYMBOL_SET_NAMES (sym, TYPE_NAME (type), len, 0, objfile); |
| 838 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; |
| 839 | SYMBOL_TYPE (sym) = type; |
| 840 | SYMBOL_DOMAIN (sym) = VAR_DOMAIN; |
| 841 | |
| 842 | dict_add_symbol (BLOCK_DICT (block), sym); |
| 843 | |
| 844 | return 0; |
| 845 | } |
| 846 | else |
| 847 | return 1; |
| 848 | } |
| 849 | |
| 850 | /* Look for a symbol named NAME in all the possible namespace blocks. |
| 851 | If one is found, return it. */ |
| 852 | |
| 853 | static struct symbol * |
| 854 | lookup_possible_namespace_symbol (const char *name) |
| 855 | { |
| 856 | struct objfile *objfile; |
| 857 | |
| 858 | ALL_OBJFILES (objfile) |
| 859 | { |
| 860 | struct symbol *sym; |
| 861 | |
| 862 | sym = lookup_block_symbol (get_possible_namespace_block (objfile), |
| 863 | name, VAR_DOMAIN); |
| 864 | |
| 865 | if (sym != NULL) |
| 866 | return sym; |
| 867 | } |
| 868 | |
| 869 | return NULL; |
| 870 | } |
| 871 | |
| 872 | /* Print out all the possible namespace symbols. */ |
| 873 | |
| 874 | static void |
| 875 | maintenance_cplus_namespace (char *args, int from_tty) |
| 876 | { |
| 877 | struct objfile *objfile; |
| 878 | printf_unfiltered (_("Possible namespaces:\n")); |
| 879 | ALL_OBJFILES (objfile) |
| 880 | { |
| 881 | struct dict_iterator iter; |
| 882 | struct symbol *sym; |
| 883 | |
| 884 | ALL_BLOCK_SYMBOLS (get_possible_namespace_block (objfile), iter, sym) |
| 885 | { |
| 886 | printf_unfiltered ("%s\n", SYMBOL_PRINT_NAME (sym)); |
| 887 | } |
| 888 | } |
| 889 | } |
| 890 | |
| 891 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 892 | extern initialize_file_ftype _initialize_cp_namespace; |
| 893 | |
| 894 | void |
| 895 | _initialize_cp_namespace (void) |
| 896 | { |
| 897 | add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, |
| 898 | _("Print the list of possible C++ namespaces."), |
| 899 | &maint_cplus_cmd_list); |
| 900 | } |