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9219021c | 1 | /* Helper routines for C++ support in GDB. |
4c38e0a4 JB |
2 | Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010 |
3 | Free Software Foundation, Inc. | |
9219021c | 4 | |
1fcb5155 | 5 | Contributed by David Carlton and by Kealia, Inc. |
9219021c DC |
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 | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
9219021c DC |
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 | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
9219021c DC |
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" | |
5c4e30ca DC |
29 | #include "objfiles.h" |
30 | #include "gdbtypes.h" | |
31 | #include "dictionary.h" | |
32 | #include "command.h" | |
b368761e | 33 | #include "frame.h" |
27aa8d6a | 34 | #include "buildsym.h" |
9219021c | 35 | |
1fcb5155 | 36 | static struct symbol *lookup_namespace_scope (const char *name, |
1fcb5155 DC |
37 | const struct block *block, |
38 | const domain_enum domain, | |
1fcb5155 DC |
39 | const char *scope, |
40 | int scope_len); | |
41 | ||
42 | static struct symbol *lookup_symbol_file (const char *name, | |
1fcb5155 DC |
43 | const struct block *block, |
44 | const domain_enum domain, | |
1fcb5155 DC |
45 | int anonymous_namespace); |
46 | ||
b368761e DC |
47 | static struct type *cp_lookup_transparent_type_loop (const char *name, |
48 | const char *scope, | |
49 | int scope_len); | |
50 | ||
5c4e30ca DC |
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 | ||
21b556f4 | 65 | static struct symbol *lookup_possible_namespace_symbol (const char *name); |
5c4e30ca DC |
66 | |
67 | static void maintenance_cplus_namespace (char *args, int from_tty); | |
68 | ||
9219021c DC |
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 | { | |
df8a16a1 | 79 | if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
9219021c | 80 | { |
df8a16a1 | 81 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
9219021c DC |
82 | unsigned int previous_component; |
83 | unsigned int next_component; | |
9219021c DC |
84 | |
85 | /* Start with a quick-and-dirty check for mention of "(anonymous | |
86 | namespace)". */ | |
87 | ||
88 | if (!cp_is_anonymous (name)) | |
89 | return; | |
90 | ||
91 | previous_component = 0; | |
92 | next_component = cp_find_first_component (name + previous_component); | |
93 | ||
94 | while (name[next_component] == ':') | |
95 | { | |
96 | if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN | |
97 | && strncmp (name + previous_component, | |
98 | "(anonymous namespace)", | |
99 | ANONYMOUS_NAMESPACE_LEN) == 0) | |
100 | { | |
8c902bb1 SW |
101 | int dest_len = (previous_component == 0 ? 0 : previous_component - 2); |
102 | int src_len = next_component; | |
794684b6 | 103 | |
8c902bb1 SW |
104 | char *dest = alloca (dest_len + 1); |
105 | char *src = alloca (src_len + 1); | |
794684b6 | 106 | |
8c902bb1 SW |
107 | memcpy (dest, name, dest_len); |
108 | memcpy (src, name, src_len); | |
794684b6 | 109 | |
8c902bb1 SW |
110 | dest[dest_len] = '\0'; |
111 | src[src_len] = '\0'; | |
794684b6 | 112 | |
9219021c DC |
113 | /* We've found a component of the name that's an |
114 | anonymous namespace. So add symbols in it to the | |
115 | namespace given by the previous component if there is | |
116 | one, or to the global namespace if there isn't. */ | |
13387711 | 117 | cp_add_using_directive (dest, src, NULL, NULL, |
c0cc3a76 | 118 | &SYMBOL_SYMTAB (symbol)->objfile->objfile_obstack); |
9219021c DC |
119 | } |
120 | /* The "+ 2" is for the "::". */ | |
121 | previous_component = next_component + 2; | |
122 | next_component = (previous_component | |
123 | + cp_find_first_component (name | |
124 | + previous_component)); | |
125 | } | |
126 | } | |
127 | } | |
128 | ||
c0cc3a76 SW |
129 | |
130 | /* Add a using directive to using_directives. If the using directive in | |
131 | question has already been added, don't add it twice. | |
132 | Create a new struct using_direct which imports the namespace SRC into the | |
133 | scope DEST. ALIAS is the name of the imported namespace in the current | |
134 | scope. If ALIAS is NULL then the namespace is known by its original name. | |
13387711 SW |
135 | DECLARATION is the name if the imported varable if this is a declaration |
136 | import (Eg. using A::x), otherwise it is NULL. The arguments are copied | |
137 | into newly allocated memory so they can be temporaries. */ | |
9219021c DC |
138 | |
139 | void | |
13387711 SW |
140 | cp_add_using_directive (const char *dest, |
141 | const char *src, | |
142 | const char *alias, | |
143 | const char *declaration, | |
c0cc3a76 | 144 | struct obstack *obstack) |
9219021c DC |
145 | { |
146 | struct using_direct *current; | |
147 | struct using_direct *new; | |
13387711 | 148 | |
9219021c DC |
149 | /* Has it already been added? */ |
150 | ||
27aa8d6a | 151 | for (current = using_directives; current != NULL; current = current->next) |
9219021c | 152 | { |
8c902bb1 | 153 | if (strcmp (current->import_src, src) == 0 |
c0cc3a76 SW |
154 | && strcmp (current->import_dest, dest) == 0 |
155 | && ((alias == NULL && current->alias == NULL) | |
156 | || (alias != NULL && current->alias != NULL | |
13387711 SW |
157 | && strcmp (alias, current->alias) == 0)) |
158 | && ((declaration == NULL && current->declaration == NULL) | |
159 | || (declaration != NULL && current->declaration != NULL | |
160 | && strcmp (declaration, current->declaration) == 0))) | |
9219021c DC |
161 | return; |
162 | } | |
163 | ||
c0cc3a76 SW |
164 | new = OBSTACK_ZALLOC (obstack, struct using_direct); |
165 | ||
166 | new->import_src = obsavestring (src, strlen (src), obstack); | |
167 | new->import_dest = obsavestring (dest, strlen (dest), obstack); | |
794684b6 | 168 | |
c0cc3a76 SW |
169 | if (alias != NULL) |
170 | new->alias = obsavestring (alias, strlen (alias), obstack); | |
171 | ||
13387711 SW |
172 | if (declaration != NULL) |
173 | new->declaration = obsavestring (declaration, strlen (declaration), | |
174 | obstack); | |
175 | ||
c0cc3a76 SW |
176 | new->next = using_directives; |
177 | using_directives = new; | |
9219021c DC |
178 | } |
179 | ||
180 | /* Record the namespace that the function defined by SYMBOL was | |
181 | defined in, if necessary. BLOCK is the associated block; use | |
182 | OBSTACK for allocation. */ | |
183 | ||
184 | void | |
185 | cp_set_block_scope (const struct symbol *symbol, | |
186 | struct block *block, | |
df8a16a1 DJ |
187 | struct obstack *obstack, |
188 | const char *processing_current_prefix, | |
189 | int processing_has_namespace_info) | |
9219021c | 190 | { |
df8a16a1 | 191 | if (processing_has_namespace_info) |
9219021c | 192 | { |
df8a16a1 DJ |
193 | block_set_scope |
194 | (block, obsavestring (processing_current_prefix, | |
195 | strlen (processing_current_prefix), | |
196 | obstack), | |
197 | obstack); | |
198 | } | |
199 | else if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) | |
200 | { | |
201 | /* Try to figure out the appropriate namespace from the | |
202 | demangled name. */ | |
9219021c | 203 | |
df8a16a1 DJ |
204 | /* FIXME: carlton/2003-04-15: If the function in question is |
205 | a method of a class, the name will actually include the | |
206 | name of the class as well. This should be harmless, but | |
207 | is a little unfortunate. */ | |
9219021c | 208 | |
df8a16a1 DJ |
209 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
210 | unsigned int prefix_len = cp_entire_prefix_len (name); | |
9219021c | 211 | |
df8a16a1 DJ |
212 | block_set_scope (block, |
213 | obsavestring (name, prefix_len, obstack), | |
214 | obstack); | |
9219021c DC |
215 | } |
216 | } | |
217 | ||
218 | /* Test whether or not NAMESPACE looks like it mentions an anonymous | |
219 | namespace; return nonzero if so. */ | |
220 | ||
221 | int | |
222 | cp_is_anonymous (const char *namespace) | |
223 | { | |
224 | return (strstr (namespace, "(anonymous namespace)") | |
225 | != NULL); | |
226 | } | |
227 | ||
1fcb5155 DC |
228 | /* The C++-specific version of name lookup for static and global |
229 | names. This makes sure that names get looked for in all namespaces | |
230 | that are in scope. NAME is the natural name of the symbol that | |
94af9270 KS |
231 | we're looking for, BLOCK is the block that we're searching within, |
232 | DOMAIN says what kind of symbols we're looking for, and if SYMTAB is | |
233 | non-NULL, we should store the symtab where we found the symbol in it. */ | |
1fcb5155 DC |
234 | |
235 | struct symbol * | |
236 | cp_lookup_symbol_nonlocal (const char *name, | |
1fcb5155 | 237 | const struct block *block, |
21b556f4 | 238 | const domain_enum domain) |
1fcb5155 | 239 | { |
8540c487 SW |
240 | struct symbol *sym; |
241 | const char *scope = block_scope (block); | |
242 | ||
94af9270 | 243 | sym = lookup_namespace_scope (name, block, domain, scope, 0); |
8540c487 SW |
244 | if (sym != NULL) |
245 | return sym; | |
246 | ||
13387711 | 247 | return cp_lookup_symbol_namespace (scope, name, block, domain); |
8540c487 SW |
248 | } |
249 | ||
13387711 | 250 | /* Look up NAME in the C++ namespace NAMESPACE. Other arguments are as in |
8540c487 SW |
251 | cp_lookup_symbol_nonlocal. */ |
252 | ||
253 | static struct symbol * | |
254 | cp_lookup_symbol_in_namespace (const char *namespace, | |
255 | const char *name, | |
8540c487 SW |
256 | const struct block *block, |
257 | const domain_enum domain) | |
258 | { | |
259 | if (namespace[0] == '\0') | |
260 | { | |
94af9270 | 261 | return lookup_symbol_file (name, block, domain, 0); |
8540c487 SW |
262 | } |
263 | else | |
264 | { | |
265 | char *concatenated_name = alloca (strlen (namespace) + 2 + | |
72f6eb52 | 266 | strlen (name) + 1); |
8540c487 SW |
267 | strcpy (concatenated_name, namespace); |
268 | strcat (concatenated_name, "::"); | |
269 | strcat (concatenated_name, name); | |
94af9270 | 270 | return lookup_symbol_file (concatenated_name, block, |
72f6eb52 | 271 | domain, cp_is_anonymous (namespace)); |
8540c487 SW |
272 | } |
273 | } | |
274 | ||
b14e635e SW |
275 | /* Used for cleanups to reset the "searched" flag incase |
276 | of an error. */ | |
277 | ||
278 | static void | |
279 | reset_directive_searched (void *data) | |
280 | { | |
281 | struct using_direct *direct = data; | |
282 | direct->searched = 0; | |
283 | } | |
284 | ||
8540c487 | 285 | /* Search for NAME by applying all import statements belonging |
13387711 SW |
286 | to BLOCK which are applicable in SCOPE. If DECLARATION_ONLY the search |
287 | is restricted to using declarations. | |
288 | Example: | |
289 | ||
290 | namespace A{ | |
291 | int x; | |
292 | } | |
293 | using A::x; | |
294 | ||
b14e635e SW |
295 | If SEARCH_PARENTS the search will include imports which are applicable in |
296 | parents of SCOPE. | |
297 | Example: | |
298 | ||
299 | namespace A{ | |
300 | using namespace X; | |
301 | namespace B{ | |
302 | using namespace Y; | |
303 | } | |
304 | } | |
305 | ||
306 | If SCOPE is "A::B" and SEARCH_PARENTS is true the imports of namespaces X | |
13387711 | 307 | and Y will be considered. If SEARCH_PARENTS is false only the import of Y |
b14e635e | 308 | is considered. */ |
8540c487 | 309 | |
13387711 | 310 | struct symbol * |
8540c487 SW |
311 | cp_lookup_symbol_imports (const char *scope, |
312 | const char *name, | |
8540c487 | 313 | const struct block *block, |
b14e635e | 314 | const domain_enum domain, |
13387711 | 315 | const int declaration_only, |
b14e635e | 316 | const int search_parents) |
8540c487 | 317 | { |
b14e635e | 318 | struct using_direct *current; |
13387711 | 319 | struct symbol *sym = NULL; |
8540c487 | 320 | int len; |
b14e635e SW |
321 | int directive_match; |
322 | struct cleanup *searched_cleanup; | |
8540c487 SW |
323 | |
324 | /* First, try to find the symbol in the given namespace. */ | |
13387711 SW |
325 | if (!declaration_only) |
326 | sym = cp_lookup_symbol_in_namespace (scope, name, block, domain); | |
327 | ||
8540c487 SW |
328 | if (sym != NULL) |
329 | return sym; | |
330 | ||
331 | /* Go through the using directives. If any of them add new | |
332 | names to the namespace we're searching in, see if we can find a | |
333 | match by applying them. */ | |
334 | ||
335 | for (current = block_using (block); | |
336 | current != NULL; | |
337 | current = current->next) | |
338 | { | |
b14e635e SW |
339 | len = strlen (current->import_dest); |
340 | directive_match = (search_parents | |
341 | ? (strncmp (scope, current->import_dest, | |
342 | strlen (current->import_dest)) == 0 | |
343 | && (len == 0 | |
344 | || scope[len] == ':' || scope[len] == '\0')) | |
345 | : strcmp (scope, current->import_dest) == 0); | |
8540c487 SW |
346 | |
347 | /* If the import destination is the current scope or one of its ancestors then | |
348 | it is applicable. */ | |
b14e635e | 349 | if (directive_match && !current->searched) |
8540c487 | 350 | { |
b14e635e SW |
351 | /* Mark this import as searched so that the recursive call does not |
352 | search it again. */ | |
353 | current->searched = 1; | |
354 | searched_cleanup = make_cleanup (reset_directive_searched, current); | |
355 | ||
13387711 | 356 | /* If there is an import of a single declaration, compare the imported |
1ac77ea1 JK |
357 | declaration (after optional renaming by its alias) with the sought |
358 | out name. If there is a match pass current->import_src as NAMESPACE | |
359 | to direct the search towards the imported namespace. */ | |
360 | if (current->declaration | |
361 | && strcmp (name, current->alias ? current->alias | |
362 | : current->declaration) == 0) | |
13387711 | 363 | sym = cp_lookup_symbol_in_namespace (current->import_src, |
1ac77ea1 | 364 | current->declaration, |
13387711 SW |
365 | block, |
366 | domain); | |
367 | ||
368 | /* If this is a DECLARATION_ONLY search or a symbol was found or | |
369 | this import statement was an import declaration, the search | |
370 | 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 | ||
82856980 SW |
382 | if (current->alias != NULL && strcmp (name, current->alias) == 0) |
383 | /* If the import is creating an alias and the alias matches the | |
384 | sought name. Pass current->import_src as the NAME to direct the | |
385 | search towards the aliased namespace. */ | |
386 | { | |
387 | sym = cp_lookup_symbol_in_namespace (scope, | |
388 | current->import_src, | |
82856980 SW |
389 | block, |
390 | domain); | |
391 | } | |
392 | else if (current->alias == NULL) | |
393 | { | |
394 | /* If this import statement creates no alias, pass current->inner as | |
395 | NAMESPACE to direct the search towards the imported namespace. */ | |
396 | sym = cp_lookup_symbol_imports (current->import_src, | |
397 | name, | |
82856980 SW |
398 | block, |
399 | domain, | |
13387711 | 400 | 0, |
82856980 SW |
401 | 0); |
402 | } | |
b14e635e SW |
403 | current->searched = 0; |
404 | discard_cleanups (searched_cleanup); | |
405 | ||
406 | if (sym != NULL) | |
407 | return sym; | |
8540c487 SW |
408 | } |
409 | } | |
410 | ||
411 | return NULL; | |
412 | } | |
413 | ||
8540c487 SW |
414 | /* Searches for NAME in the current namespace, and by applying relevant import |
415 | statements belonging to BLOCK and its parents. SCOPE is the namespace scope | |
416 | of the context in which the search is being evaluated. */ | |
417 | ||
418 | struct symbol* | |
419 | cp_lookup_symbol_namespace (const char *scope, | |
420 | const char *name, | |
8540c487 | 421 | const struct block *block, |
13387711 | 422 | const domain_enum domain) |
8540c487 SW |
423 | { |
424 | struct symbol *sym; | |
13387711 SW |
425 | |
426 | /* First, try to find the symbol in the given namespace. */ | |
427 | sym = cp_lookup_symbol_in_namespace (scope, name, block, domain); | |
428 | if (sym != NULL) | |
429 | return sym; | |
8540c487 SW |
430 | |
431 | /* Search for name in namespaces imported to this and parent blocks. */ | |
432 | while (block != NULL) | |
433 | { | |
13387711 | 434 | sym = cp_lookup_symbol_imports (scope, name, block, domain, 0, 1); |
8540c487 SW |
435 | |
436 | if (sym) | |
437 | return sym; | |
438 | ||
439 | block = BLOCK_SUPERBLOCK (block); | |
440 | } | |
441 | ||
442 | return NULL; | |
1fcb5155 DC |
443 | } |
444 | ||
445 | /* Lookup NAME at namespace scope (or, in C terms, in static and | |
446 | global variables). SCOPE is the namespace that the current | |
447 | function is defined within; only consider namespaces whose length | |
448 | is at least SCOPE_LEN. Other arguments are as in | |
449 | cp_lookup_symbol_nonlocal. | |
450 | ||
451 | For example, if we're within a function A::B::f and looking for a | |
3882f37a | 452 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
1fcb5155 DC |
453 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
454 | but with SCOPE_LEN = 1. And then it calls itself with NAME and | |
455 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for | |
456 | "A::B::x"; if it doesn't find it, then the second call looks for | |
457 | "A::x", and if that call fails, then the first call looks for | |
458 | "x". */ | |
459 | ||
460 | static struct symbol * | |
461 | lookup_namespace_scope (const char *name, | |
1fcb5155 DC |
462 | const struct block *block, |
463 | const domain_enum domain, | |
1fcb5155 DC |
464 | const char *scope, |
465 | int scope_len) | |
466 | { | |
467 | char *namespace; | |
468 | ||
469 | if (scope[scope_len] != '\0') | |
470 | { | |
471 | /* Recursively search for names in child namespaces first. */ | |
472 | ||
473 | struct symbol *sym; | |
474 | int new_scope_len = scope_len; | |
475 | ||
476 | /* If the current scope is followed by "::", skip past that. */ | |
477 | if (new_scope_len != 0) | |
478 | { | |
479 | gdb_assert (scope[new_scope_len] == ':'); | |
480 | new_scope_len += 2; | |
481 | } | |
482 | new_scope_len += cp_find_first_component (scope + new_scope_len); | |
94af9270 | 483 | sym = lookup_namespace_scope (name, block, domain, scope, new_scope_len); |
1fcb5155 DC |
484 | if (sym != NULL) |
485 | return sym; | |
486 | } | |
487 | ||
488 | /* Okay, we didn't find a match in our children, so look for the | |
489 | name in the current namespace. */ | |
490 | ||
491 | namespace = alloca (scope_len + 1); | |
492 | strncpy (namespace, scope, scope_len); | |
493 | namespace[scope_len] = '\0'; | |
94af9270 | 494 | return cp_lookup_symbol_in_namespace (namespace, name, block, domain); |
1fcb5155 DC |
495 | } |
496 | ||
497 | /* Look up NAME in BLOCK's static block and in global blocks. If | |
498 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located | |
499 | within an anonymous namespace. Other arguments are as in | |
500 | cp_lookup_symbol_nonlocal. */ | |
501 | ||
502 | static struct symbol * | |
503 | lookup_symbol_file (const char *name, | |
1fcb5155 DC |
504 | const struct block *block, |
505 | const domain_enum domain, | |
1fcb5155 DC |
506 | int anonymous_namespace) |
507 | { | |
508 | struct symbol *sym = NULL; | |
509 | ||
94af9270 | 510 | sym = lookup_symbol_static (name, block, domain); |
1fcb5155 DC |
511 | if (sym != NULL) |
512 | return sym; | |
513 | ||
514 | if (anonymous_namespace) | |
515 | { | |
516 | /* Symbols defined in anonymous namespaces have external linkage | |
517 | but should be treated as local to a single file nonetheless. | |
518 | So we only search the current file's global block. */ | |
519 | ||
520 | const struct block *global_block = block_global_block (block); | |
521 | ||
522 | if (global_block != NULL) | |
94af9270 | 523 | sym = lookup_symbol_aux_block (name, global_block, domain); |
1fcb5155 DC |
524 | } |
525 | else | |
526 | { | |
94af9270 | 527 | sym = lookup_symbol_global (name, block, domain); |
5c4e30ca DC |
528 | } |
529 | ||
530 | if (sym != NULL) | |
531 | return sym; | |
532 | ||
533 | /* Now call "lookup_possible_namespace_symbol". Symbols in here | |
534 | claim to be associated to namespaces, but this claim might be | |
535 | incorrect: the names in question might actually correspond to | |
536 | classes instead of namespaces. But if they correspond to | |
537 | classes, then we should have found a match for them above. So if | |
538 | we find them now, they should be genuine. */ | |
539 | ||
540 | /* FIXME: carlton/2003-06-12: This is a hack and should eventually | |
541 | be deleted: see comments below. */ | |
542 | ||
543 | if (domain == VAR_DOMAIN) | |
544 | { | |
21b556f4 | 545 | sym = lookup_possible_namespace_symbol (name); |
5c4e30ca DC |
546 | if (sym != NULL) |
547 | return sym; | |
548 | } | |
549 | ||
550 | return NULL; | |
551 | } | |
552 | ||
79c2c32d DC |
553 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
554 | class or namespace given by PARENT_TYPE, from within the context | |
555 | given by BLOCK. Return NULL if there is no such nested type. */ | |
556 | ||
79c2c32d DC |
557 | struct type * |
558 | cp_lookup_nested_type (struct type *parent_type, | |
559 | const char *nested_name, | |
560 | const struct block *block) | |
561 | { | |
562 | switch (TYPE_CODE (parent_type)) | |
563 | { | |
63d06c5c | 564 | case TYPE_CODE_STRUCT: |
79c2c32d | 565 | case TYPE_CODE_NAMESPACE: |
48e32051 | 566 | case TYPE_CODE_UNION: |
79c2c32d | 567 | { |
63d06c5c DC |
568 | /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
569 | of classes like, say, data or function members. Instead, | |
570 | they're just represented by symbols whose names are | |
571 | qualified by the name of the surrounding class. This is | |
572 | just like members of namespaces; in particular, | |
573 | lookup_symbol_namespace works when looking them up. */ | |
574 | ||
79c2c32d | 575 | const char *parent_name = TYPE_TAG_NAME (parent_type); |
8540c487 SW |
576 | struct symbol *sym = cp_lookup_symbol_in_namespace (parent_name, |
577 | nested_name, | |
8540c487 SW |
578 | block, |
579 | VAR_DOMAIN); | |
79c2c32d DC |
580 | if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF) |
581 | return NULL; | |
582 | else | |
583 | return SYMBOL_TYPE (sym); | |
584 | } | |
585 | default: | |
586 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 587 | _("cp_lookup_nested_type called on a non-aggregate type.")); |
79c2c32d DC |
588 | } |
589 | } | |
590 | ||
b368761e DC |
591 | /* The C++-version of lookup_transparent_type. */ |
592 | ||
593 | /* FIXME: carlton/2004-01-16: The problem that this is trying to | |
594 | address is that, unfortunately, sometimes NAME is wrong: it may not | |
595 | include the name of namespaces enclosing the type in question. | |
596 | lookup_transparent_type gets called when the the type in question | |
597 | is a declaration, and we're trying to find its definition; but, for | |
598 | declarations, our type name deduction mechanism doesn't work. | |
599 | There's nothing we can do to fix this in general, I think, in the | |
600 | absence of debug information about namespaces (I've filed PR | |
601 | gdb/1511 about this); until such debug information becomes more | |
602 | prevalent, one heuristic which sometimes looks is to search for the | |
603 | definition in namespaces containing the current namespace. | |
604 | ||
605 | We should delete this functions once the appropriate debug | |
606 | information becomes more widespread. (GCC 3.4 will be the first | |
607 | released version of GCC with such information.) */ | |
608 | ||
609 | struct type * | |
610 | cp_lookup_transparent_type (const char *name) | |
611 | { | |
612 | /* First, try the honest way of looking up the definition. */ | |
613 | struct type *t = basic_lookup_transparent_type (name); | |
614 | const char *scope; | |
615 | ||
616 | if (t != NULL) | |
617 | return t; | |
618 | ||
619 | /* If that doesn't work and we're within a namespace, look there | |
620 | instead. */ | |
621 | scope = block_scope (get_selected_block (0)); | |
622 | ||
623 | if (scope[0] == '\0') | |
624 | return NULL; | |
625 | ||
626 | return cp_lookup_transparent_type_loop (name, scope, 0); | |
627 | } | |
628 | ||
629 | /* Lookup the the type definition associated to NAME in | |
630 | namespaces/classes containing SCOPE whose name is strictly longer | |
631 | than LENGTH. LENGTH must be the index of the start of a | |
632 | component of SCOPE. */ | |
633 | ||
634 | static struct type * | |
635 | cp_lookup_transparent_type_loop (const char *name, const char *scope, | |
636 | int length) | |
637 | { | |
1198ecbe | 638 | int scope_length = length + cp_find_first_component (scope + length); |
b368761e DC |
639 | char *full_name; |
640 | ||
641 | /* If the current scope is followed by "::", look in the next | |
642 | component. */ | |
643 | if (scope[scope_length] == ':') | |
644 | { | |
645 | struct type *retval | |
646 | = cp_lookup_transparent_type_loop (name, scope, scope_length + 2); | |
647 | if (retval != NULL) | |
648 | return retval; | |
649 | } | |
650 | ||
651 | full_name = alloca (scope_length + 2 + strlen (name) + 1); | |
652 | strncpy (full_name, scope, scope_length); | |
653 | strncpy (full_name + scope_length, "::", 2); | |
654 | strcpy (full_name + scope_length + 2, name); | |
655 | ||
656 | return basic_lookup_transparent_type (full_name); | |
657 | } | |
658 | ||
5c4e30ca DC |
659 | /* Now come functions for dealing with symbols associated to |
660 | namespaces. (They're used to store the namespaces themselves, not | |
661 | objects that live in the namespaces.) These symbols come in two | |
662 | varieties: if we run into a DW_TAG_namespace DIE, then we know that | |
663 | we have a namespace, so dwarf2read.c creates a symbol for it just | |
664 | like normal. But, unfortunately, versions of GCC through at least | |
665 | 3.3 don't generate those DIE's. Our solution is to try to guess | |
666 | their existence by looking at demangled names. This might cause us | |
667 | to misidentify classes as namespaces, however. So we put those | |
668 | symbols in a special block (one per objfile), and we only search | |
669 | that block as a last resort. */ | |
670 | ||
671 | /* FIXME: carlton/2003-06-12: Once versions of GCC that generate | |
672 | DW_TAG_namespace have been out for a year or two, we should get rid | |
673 | of all of this "possible namespace" nonsense. */ | |
674 | ||
675 | /* Allocate everything necessary for the possible namespace block | |
676 | associated to OBJFILE. */ | |
677 | ||
678 | static void | |
679 | initialize_namespace_symtab (struct objfile *objfile) | |
680 | { | |
681 | struct symtab *namespace_symtab; | |
682 | struct blockvector *bv; | |
683 | struct block *bl; | |
684 | ||
685 | namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); | |
686 | namespace_symtab->language = language_cplus; | |
687 | namespace_symtab->free_code = free_nothing; | |
688 | namespace_symtab->dirname = NULL; | |
689 | ||
4a146b47 | 690 | bv = obstack_alloc (&objfile->objfile_obstack, |
5c4e30ca DC |
691 | sizeof (struct blockvector) |
692 | + FIRST_LOCAL_BLOCK * sizeof (struct block *)); | |
693 | BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; | |
694 | BLOCKVECTOR (namespace_symtab) = bv; | |
695 | ||
696 | /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ | |
697 | ||
4a146b47 EZ |
698 | bl = allocate_block (&objfile->objfile_obstack); |
699 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
700 | NULL); |
701 | BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; | |
4a146b47 EZ |
702 | bl = allocate_block (&objfile->objfile_obstack); |
703 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
704 | NULL); |
705 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; | |
706 | ||
707 | /* Allocate the possible namespace block; we put it where the first | |
708 | local block will live, though I don't think there's any need to | |
709 | pretend that it's actually a local block (e.g. by setting | |
710 | BLOCK_SUPERBLOCK appropriately). We don't use the global or | |
711 | static block because we don't want it searched during the normal | |
712 | search of all global/static blocks in lookup_symbol: we only want | |
713 | it used as a last resort. */ | |
714 | ||
715 | /* NOTE: carlton/2003-09-11: I considered not associating the fake | |
716 | symbols to a block/symtab at all. But that would cause problems | |
717 | with lookup_symbol's SYMTAB argument and with block_found, so | |
718 | having a symtab/block for this purpose seems like the best | |
719 | solution for now. */ | |
720 | ||
4a146b47 | 721 | bl = allocate_block (&objfile->objfile_obstack); |
5c4e30ca DC |
722 | BLOCK_DICT (bl) = dict_create_hashed_expandable (); |
723 | BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; | |
724 | ||
725 | namespace_symtab->free_func = free_namespace_block; | |
726 | ||
727 | objfile->cp_namespace_symtab = namespace_symtab; | |
728 | } | |
729 | ||
730 | /* Locate the possible namespace block associated to OBJFILE, | |
731 | allocating it if necessary. */ | |
732 | ||
733 | static struct block * | |
734 | get_possible_namespace_block (struct objfile *objfile) | |
735 | { | |
736 | if (objfile->cp_namespace_symtab == NULL) | |
737 | initialize_namespace_symtab (objfile); | |
738 | ||
739 | return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), | |
740 | FIRST_LOCAL_BLOCK); | |
741 | } | |
742 | ||
743 | /* Free the dictionary associated to the possible namespace block. */ | |
744 | ||
745 | static void | |
746 | free_namespace_block (struct symtab *symtab) | |
747 | { | |
748 | struct block *possible_namespace_block; | |
749 | ||
750 | possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), | |
751 | FIRST_LOCAL_BLOCK); | |
752 | gdb_assert (possible_namespace_block != NULL); | |
753 | dict_free (BLOCK_DICT (possible_namespace_block)); | |
754 | } | |
755 | ||
756 | /* Ensure that there are symbols in the possible namespace block | |
757 | associated to OBJFILE for all initial substrings of NAME that look | |
758 | like namespaces or classes. NAME should end in a member variable: | |
759 | it shouldn't consist solely of namespaces. */ | |
760 | ||
761 | void | |
762 | cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) | |
763 | { | |
764 | check_possible_namespace_symbols_loop (name, | |
765 | cp_find_first_component (name), | |
766 | objfile); | |
767 | } | |
768 | ||
769 | /* This is a helper loop for cp_check_possible_namespace_symbols; it | |
770 | ensures that there are symbols in the possible namespace block | |
771 | associated to OBJFILE for all namespaces that are initial | |
772 | substrings of NAME of length at least LEN. It returns 1 if a | |
773 | previous loop had already created the shortest such symbol and 0 | |
774 | otherwise. | |
775 | ||
776 | This function assumes that if there is already a symbol associated | |
777 | to a substring of NAME of a given length, then there are already | |
778 | symbols associated to all substrings of NAME whose length is less | |
779 | than that length. So if cp_check_possible_namespace_symbols has | |
780 | been called once with argument "A::B::C::member", then that will | |
781 | create symbols "A", "A::B", and "A::B::C". If it is then later | |
782 | called with argument "A::B::D::member", then the new call will | |
783 | generate a new symbol for "A::B::D", but once it sees that "A::B" | |
784 | has already been created, it doesn't bother checking to see if "A" | |
785 | has also been created. */ | |
786 | ||
787 | static int | |
788 | check_possible_namespace_symbols_loop (const char *name, int len, | |
789 | struct objfile *objfile) | |
790 | { | |
791 | if (name[len] == ':') | |
792 | { | |
793 | int done; | |
794 | int next_len = len + 2; | |
795 | ||
796 | next_len += cp_find_first_component (name + next_len); | |
797 | done = check_possible_namespace_symbols_loop (name, next_len, | |
798 | objfile); | |
799 | ||
800 | if (!done) | |
801 | done = check_one_possible_namespace_symbol (name, len, objfile); | |
802 | ||
803 | return done; | |
1fcb5155 | 804 | } |
5c4e30ca DC |
805 | else |
806 | return 0; | |
807 | } | |
808 | ||
809 | /* Check to see if there's already a possible namespace symbol in | |
810 | OBJFILE whose name is the initial substring of NAME of length LEN. | |
811 | If not, create one and return 0; otherwise, return 1. */ | |
812 | ||
813 | static int | |
814 | check_one_possible_namespace_symbol (const char *name, int len, | |
815 | struct objfile *objfile) | |
816 | { | |
817 | struct block *block = get_possible_namespace_block (objfile); | |
ec5cdd75 DJ |
818 | char *name_copy = alloca (len + 1); |
819 | struct symbol *sym; | |
820 | ||
821 | memcpy (name_copy, name, len); | |
822 | name_copy[len] = '\0'; | |
94af9270 | 823 | sym = lookup_block_symbol (block, name_copy, VAR_DOMAIN); |
5c4e30ca DC |
824 | |
825 | if (sym == NULL) | |
826 | { | |
ec5cdd75 | 827 | struct type *type; |
ec5cdd75 DJ |
828 | |
829 | type = init_type (TYPE_CODE_NAMESPACE, 0, 0, name_copy, objfile); | |
830 | ||
5c4e30ca DC |
831 | TYPE_TAG_NAME (type) = TYPE_NAME (type); |
832 | ||
4a146b47 | 833 | sym = obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); |
5c4e30ca DC |
834 | memset (sym, 0, sizeof (struct symbol)); |
835 | SYMBOL_LANGUAGE (sym) = language_cplus; | |
04a679b8 TT |
836 | /* Note that init_type copied the name to the objfile's |
837 | obstack. */ | |
838 | SYMBOL_SET_NAMES (sym, TYPE_NAME (type), len, 0, objfile); | |
5c4e30ca DC |
839 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; |
840 | SYMBOL_TYPE (sym) = type; | |
841 | SYMBOL_DOMAIN (sym) = VAR_DOMAIN; | |
842 | ||
843 | dict_add_symbol (BLOCK_DICT (block), sym); | |
844 | ||
845 | return 0; | |
846 | } | |
847 | else | |
ec5cdd75 | 848 | return 1; |
5c4e30ca DC |
849 | } |
850 | ||
851 | /* Look for a symbol named NAME in all the possible namespace blocks. | |
21b556f4 | 852 | If one is found, return it. */ |
5c4e30ca DC |
853 | |
854 | static struct symbol * | |
21b556f4 | 855 | lookup_possible_namespace_symbol (const char *name) |
5c4e30ca DC |
856 | { |
857 | struct objfile *objfile; | |
858 | ||
859 | ALL_OBJFILES (objfile) | |
860 | { | |
861 | struct symbol *sym; | |
862 | ||
863 | sym = lookup_block_symbol (get_possible_namespace_block (objfile), | |
94af9270 | 864 | name, VAR_DOMAIN); |
5c4e30ca DC |
865 | |
866 | if (sym != NULL) | |
21b556f4 | 867 | return sym; |
5c4e30ca DC |
868 | } |
869 | ||
870 | return NULL; | |
871 | } | |
872 | ||
873 | /* Print out all the possible namespace symbols. */ | |
874 | ||
875 | static void | |
876 | maintenance_cplus_namespace (char *args, int from_tty) | |
877 | { | |
878 | struct objfile *objfile; | |
a3f17187 | 879 | printf_unfiltered (_("Possible namespaces:\n")); |
5c4e30ca DC |
880 | ALL_OBJFILES (objfile) |
881 | { | |
882 | struct dict_iterator iter; | |
883 | struct symbol *sym; | |
884 | ||
885 | ALL_BLOCK_SYMBOLS (get_possible_namespace_block (objfile), iter, sym) | |
886 | { | |
887 | printf_unfiltered ("%s\n", SYMBOL_PRINT_NAME (sym)); | |
888 | } | |
889 | } | |
890 | } | |
891 | ||
2c0b251b PA |
892 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
893 | extern initialize_file_ftype _initialize_cp_namespace; | |
894 | ||
5c4e30ca DC |
895 | void |
896 | _initialize_cp_namespace (void) | |
897 | { | |
898 | add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, | |
1a966eab | 899 | _("Print the list of possible C++ namespaces."), |
5c4e30ca | 900 | &maint_cplus_cmd_list); |
1fcb5155 | 901 | } |