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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 DC |
36 | static struct symbol *lookup_namespace_scope (const char *name, |
37 | const char *linkage_name, | |
38 | const struct block *block, | |
39 | const domain_enum domain, | |
1fcb5155 DC |
40 | const char *scope, |
41 | int scope_len); | |
42 | ||
43 | static struct symbol *lookup_symbol_file (const char *name, | |
44 | const char *linkage_name, | |
45 | const struct block *block, | |
46 | const domain_enum domain, | |
1fcb5155 DC |
47 | int anonymous_namespace); |
48 | ||
b368761e DC |
49 | static struct type *cp_lookup_transparent_type_loop (const char *name, |
50 | const char *scope, | |
51 | int scope_len); | |
52 | ||
5c4e30ca DC |
53 | static void initialize_namespace_symtab (struct objfile *objfile); |
54 | ||
55 | static struct block *get_possible_namespace_block (struct objfile *objfile); | |
56 | ||
57 | static void free_namespace_block (struct symtab *symtab); | |
58 | ||
59 | static int check_possible_namespace_symbols_loop (const char *name, | |
60 | int len, | |
61 | struct objfile *objfile); | |
62 | ||
63 | static int check_one_possible_namespace_symbol (const char *name, | |
64 | int len, | |
65 | struct objfile *objfile); | |
66 | ||
21b556f4 | 67 | static struct symbol *lookup_possible_namespace_symbol (const char *name); |
5c4e30ca DC |
68 | |
69 | static void maintenance_cplus_namespace (char *args, int from_tty); | |
70 | ||
9219021c DC |
71 | /* Check to see if SYMBOL refers to an object contained within an |
72 | anonymous namespace; if so, add an appropriate using directive. */ | |
73 | ||
74 | /* Optimize away strlen ("(anonymous namespace)"). */ | |
75 | ||
76 | #define ANONYMOUS_NAMESPACE_LEN 21 | |
77 | ||
78 | void | |
79 | cp_scan_for_anonymous_namespaces (const struct symbol *symbol) | |
80 | { | |
df8a16a1 | 81 | if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
9219021c | 82 | { |
df8a16a1 | 83 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
9219021c DC |
84 | unsigned int previous_component; |
85 | unsigned int next_component; | |
86 | const char *len; | |
87 | ||
88 | /* Start with a quick-and-dirty check for mention of "(anonymous | |
89 | namespace)". */ | |
90 | ||
91 | if (!cp_is_anonymous (name)) | |
92 | return; | |
93 | ||
94 | previous_component = 0; | |
95 | next_component = cp_find_first_component (name + previous_component); | |
96 | ||
97 | while (name[next_component] == ':') | |
98 | { | |
99 | if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN | |
100 | && strncmp (name + previous_component, | |
101 | "(anonymous namespace)", | |
102 | ANONYMOUS_NAMESPACE_LEN) == 0) | |
103 | { | |
8c902bb1 SW |
104 | int dest_len = (previous_component == 0 ? 0 : previous_component - 2); |
105 | int src_len = next_component; | |
794684b6 | 106 | |
8c902bb1 SW |
107 | char *dest = alloca (dest_len + 1); |
108 | char *src = alloca (src_len + 1); | |
794684b6 | 109 | |
8c902bb1 SW |
110 | memcpy (dest, name, dest_len); |
111 | memcpy (src, name, src_len); | |
794684b6 | 112 | |
8c902bb1 SW |
113 | dest[dest_len] = '\0'; |
114 | src[src_len] = '\0'; | |
794684b6 | 115 | |
9219021c DC |
116 | /* We've found a component of the name that's an |
117 | anonymous namespace. So add symbols in it to the | |
118 | namespace given by the previous component if there is | |
119 | one, or to the global namespace if there isn't. */ | |
82856980 | 120 | cp_add_using_directive (dest, src, NULL); |
9219021c DC |
121 | } |
122 | /* The "+ 2" is for the "::". */ | |
123 | previous_component = next_component + 2; | |
124 | next_component = (previous_component | |
125 | + cp_find_first_component (name | |
126 | + previous_component)); | |
127 | } | |
128 | } | |
129 | } | |
130 | ||
794684b6 SW |
131 | /* Add a using directive to using_list. If the using directive in question |
132 | has already been added, don't add it twice. */ | |
9219021c DC |
133 | |
134 | void | |
82856980 | 135 | cp_add_using_directive (const char *dest, const char *src, const char *alias) |
9219021c DC |
136 | { |
137 | struct using_direct *current; | |
138 | struct using_direct *new; | |
139 | ||
140 | /* Has it already been added? */ | |
141 | ||
27aa8d6a | 142 | for (current = using_directives; current != NULL; current = current->next) |
9219021c | 143 | { |
8c902bb1 SW |
144 | if (strcmp (current->import_src, src) == 0 |
145 | && strcmp (current->import_dest, dest) == 0) | |
9219021c DC |
146 | return; |
147 | } | |
148 | ||
82856980 | 149 | using_directives = cp_add_using (dest, src, alias, using_directives); |
794684b6 | 150 | |
9219021c DC |
151 | } |
152 | ||
153 | /* Record the namespace that the function defined by SYMBOL was | |
154 | defined in, if necessary. BLOCK is the associated block; use | |
155 | OBSTACK for allocation. */ | |
156 | ||
157 | void | |
158 | cp_set_block_scope (const struct symbol *symbol, | |
159 | struct block *block, | |
df8a16a1 DJ |
160 | struct obstack *obstack, |
161 | const char *processing_current_prefix, | |
162 | int processing_has_namespace_info) | |
9219021c | 163 | { |
df8a16a1 | 164 | if (processing_has_namespace_info) |
9219021c | 165 | { |
df8a16a1 DJ |
166 | block_set_scope |
167 | (block, obsavestring (processing_current_prefix, | |
168 | strlen (processing_current_prefix), | |
169 | obstack), | |
170 | obstack); | |
171 | } | |
172 | else if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) | |
173 | { | |
174 | /* Try to figure out the appropriate namespace from the | |
175 | demangled name. */ | |
9219021c | 176 | |
df8a16a1 DJ |
177 | /* FIXME: carlton/2003-04-15: If the function in question is |
178 | a method of a class, the name will actually include the | |
179 | name of the class as well. This should be harmless, but | |
180 | is a little unfortunate. */ | |
9219021c | 181 | |
df8a16a1 DJ |
182 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
183 | unsigned int prefix_len = cp_entire_prefix_len (name); | |
9219021c | 184 | |
df8a16a1 DJ |
185 | block_set_scope (block, |
186 | obsavestring (name, prefix_len, obstack), | |
187 | obstack); | |
9219021c DC |
188 | } |
189 | } | |
190 | ||
191 | /* Test whether or not NAMESPACE looks like it mentions an anonymous | |
192 | namespace; return nonzero if so. */ | |
193 | ||
194 | int | |
195 | cp_is_anonymous (const char *namespace) | |
196 | { | |
197 | return (strstr (namespace, "(anonymous namespace)") | |
198 | != NULL); | |
199 | } | |
200 | ||
82856980 SW |
201 | /* Create a new struct using direct which imports the namespace SRC into the |
202 | scope DEST. ALIAS is the name of the imported namespace in the current | |
203 | scope. If ALIAS is NULL then the namespace is known by its original name. | |
9219021c DC |
204 | Set its next member in the linked list to NEXT; allocate all memory |
205 | using xmalloc. It copies the strings, so NAME can be a temporary | |
206 | string. */ | |
207 | ||
27aa8d6a | 208 | struct using_direct * |
8c902bb1 SW |
209 | cp_add_using (const char *dest, |
210 | const char *src, | |
82856980 | 211 | const char *alias, |
9219021c DC |
212 | struct using_direct *next) |
213 | { | |
214 | struct using_direct *retval; | |
215 | ||
9219021c | 216 | retval = xmalloc (sizeof (struct using_direct)); |
8c902bb1 SW |
217 | retval->import_src = savestring (src, strlen(src)); |
218 | retval->import_dest = savestring (dest, strlen(dest)); | |
82856980 SW |
219 | |
220 | if (alias != NULL) | |
221 | retval->alias = savestring (alias, strlen (alias)); | |
222 | else | |
223 | retval->alias = NULL; | |
224 | ||
9219021c | 225 | retval->next = next; |
b14e635e | 226 | retval->searched = 0; |
9219021c DC |
227 | |
228 | return retval; | |
229 | } | |
230 | ||
1fcb5155 DC |
231 | /* The C++-specific version of name lookup for static and global |
232 | names. This makes sure that names get looked for in all namespaces | |
233 | that are in scope. NAME is the natural name of the symbol that | |
234 | we're looking for, LINKAGE_NAME (which is optional) is its linkage | |
235 | name, BLOCK is the block that we're searching within, DOMAIN says | |
236 | what kind of symbols we're looking for, and if SYMTAB is non-NULL, | |
237 | we should store the symtab where we found the symbol in it. */ | |
238 | ||
239 | struct symbol * | |
240 | cp_lookup_symbol_nonlocal (const char *name, | |
241 | const char *linkage_name, | |
242 | const struct block *block, | |
21b556f4 | 243 | const domain_enum domain) |
1fcb5155 | 244 | { |
8540c487 SW |
245 | struct symbol *sym; |
246 | const char *scope = block_scope (block); | |
247 | ||
248 | sym = lookup_namespace_scope (name, linkage_name, block, domain, scope, 0); | |
249 | if (sym != NULL) | |
250 | return sym; | |
251 | ||
b14e635e SW |
252 | return cp_lookup_symbol_namespace (scope, name, linkage_name, block, domain, |
253 | 1); | |
8540c487 SW |
254 | } |
255 | ||
256 | /* Look up NAME in the C++ namespace NAMESPACE. Other arguments are as in | |
257 | cp_lookup_symbol_nonlocal. */ | |
258 | ||
259 | static struct symbol * | |
260 | cp_lookup_symbol_in_namespace (const char *namespace, | |
261 | const char *name, | |
262 | const char *linkage_name, | |
263 | const struct block *block, | |
264 | const domain_enum domain) | |
265 | { | |
266 | if (namespace[0] == '\0') | |
267 | { | |
268 | return lookup_symbol_file (name, linkage_name, block, | |
269 | domain, 0); | |
270 | } | |
271 | else | |
272 | { | |
273 | char *concatenated_name = alloca (strlen (namespace) + 2 + | |
274 | strlen (name+ 1)); | |
275 | strcpy (concatenated_name, namespace); | |
276 | strcat (concatenated_name, "::"); | |
277 | strcat (concatenated_name, name); | |
278 | return lookup_symbol_file (concatenated_name, linkage_name, | |
279 | block, domain,cp_is_anonymous (namespace)); | |
280 | } | |
281 | } | |
282 | ||
b14e635e SW |
283 | /* Used for cleanups to reset the "searched" flag incase |
284 | of an error. */ | |
285 | ||
286 | static void | |
287 | reset_directive_searched (void *data) | |
288 | { | |
289 | struct using_direct *direct = data; | |
290 | direct->searched = 0; | |
291 | } | |
292 | ||
8540c487 | 293 | /* Search for NAME by applying all import statements belonging |
b14e635e SW |
294 | to BLOCK which are applicable in SCOPE. |
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 | |
307 | and Y will be considered. If SEARCH_PARENTS is false only the import of Y | |
308 | is considered. */ | |
8540c487 SW |
309 | |
310 | static struct symbol * | |
311 | cp_lookup_symbol_imports (const char *scope, | |
312 | const char *name, | |
313 | const char *linkage_name, | |
314 | const struct block *block, | |
b14e635e SW |
315 | const domain_enum domain, |
316 | const int search_parents) | |
8540c487 | 317 | { |
b14e635e | 318 | struct using_direct *current; |
8540c487 SW |
319 | struct symbol *sym; |
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. */ | |
325 | sym = cp_lookup_symbol_in_namespace (scope, name, linkage_name, block, | |
326 | domain); | |
327 | if (sym != NULL) | |
328 | return sym; | |
329 | ||
330 | /* Go through the using directives. If any of them add new | |
331 | names to the namespace we're searching in, see if we can find a | |
332 | match by applying them. */ | |
333 | ||
334 | for (current = block_using (block); | |
335 | current != NULL; | |
336 | current = current->next) | |
337 | { | |
b14e635e SW |
338 | len = strlen (current->import_dest); |
339 | directive_match = (search_parents | |
340 | ? (strncmp (scope, current->import_dest, | |
341 | strlen (current->import_dest)) == 0 | |
342 | && (len == 0 | |
343 | || scope[len] == ':' || scope[len] == '\0')) | |
344 | : strcmp (scope, current->import_dest) == 0); | |
8540c487 SW |
345 | |
346 | /* If the import destination is the current scope or one of its ancestors then | |
347 | it is applicable. */ | |
b14e635e | 348 | if (directive_match && !current->searched) |
8540c487 | 349 | { |
b14e635e SW |
350 | /* Mark this import as searched so that the recursive call does not |
351 | search it again. */ | |
352 | current->searched = 1; | |
353 | searched_cleanup = make_cleanup (reset_directive_searched, current); | |
354 | ||
82856980 SW |
355 | if (current->alias != NULL && strcmp (name, current->alias) == 0) |
356 | /* If the import is creating an alias and the alias matches the | |
357 | sought name. Pass current->import_src as the NAME to direct the | |
358 | search towards the aliased namespace. */ | |
359 | { | |
360 | sym = cp_lookup_symbol_in_namespace (scope, | |
361 | current->import_src, | |
362 | linkage_name, | |
363 | block, | |
364 | domain); | |
365 | } | |
366 | else if (current->alias == NULL) | |
367 | { | |
368 | /* If this import statement creates no alias, pass current->inner as | |
369 | NAMESPACE to direct the search towards the imported namespace. */ | |
370 | sym = cp_lookup_symbol_imports (current->import_src, | |
371 | name, | |
372 | linkage_name, | |
373 | block, | |
374 | domain, | |
375 | 0); | |
376 | } | |
b14e635e SW |
377 | current->searched = 0; |
378 | discard_cleanups (searched_cleanup); | |
379 | ||
380 | if (sym != NULL) | |
381 | return sym; | |
8540c487 SW |
382 | } |
383 | } | |
384 | ||
385 | return NULL; | |
386 | } | |
387 | ||
8540c487 SW |
388 | /* Searches for NAME in the current namespace, and by applying relevant import |
389 | statements belonging to BLOCK and its parents. SCOPE is the namespace scope | |
390 | of the context in which the search is being evaluated. */ | |
391 | ||
392 | struct symbol* | |
393 | cp_lookup_symbol_namespace (const char *scope, | |
394 | const char *name, | |
395 | const char *linkage_name, | |
396 | const struct block *block, | |
b14e635e SW |
397 | const domain_enum domain, |
398 | const int search_parents) | |
8540c487 SW |
399 | { |
400 | struct symbol *sym; | |
401 | ||
402 | /* Search for name in namespaces imported to this and parent blocks. */ | |
403 | while (block != NULL) | |
404 | { | |
b14e635e SW |
405 | sym = cp_lookup_symbol_imports (scope, name, linkage_name, block, domain, |
406 | search_parents); | |
8540c487 SW |
407 | |
408 | if (sym) | |
409 | return sym; | |
410 | ||
411 | block = BLOCK_SUPERBLOCK (block); | |
412 | } | |
413 | ||
414 | return NULL; | |
1fcb5155 DC |
415 | } |
416 | ||
417 | /* Lookup NAME at namespace scope (or, in C terms, in static and | |
418 | global variables). SCOPE is the namespace that the current | |
419 | function is defined within; only consider namespaces whose length | |
420 | is at least SCOPE_LEN. Other arguments are as in | |
421 | cp_lookup_symbol_nonlocal. | |
422 | ||
423 | For example, if we're within a function A::B::f and looking for a | |
3882f37a | 424 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
1fcb5155 DC |
425 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
426 | but with SCOPE_LEN = 1. And then it calls itself with NAME and | |
427 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for | |
428 | "A::B::x"; if it doesn't find it, then the second call looks for | |
429 | "A::x", and if that call fails, then the first call looks for | |
430 | "x". */ | |
431 | ||
432 | static struct symbol * | |
433 | lookup_namespace_scope (const char *name, | |
434 | const char *linkage_name, | |
435 | const struct block *block, | |
436 | const domain_enum domain, | |
1fcb5155 DC |
437 | const char *scope, |
438 | int scope_len) | |
439 | { | |
440 | char *namespace; | |
441 | ||
442 | if (scope[scope_len] != '\0') | |
443 | { | |
444 | /* Recursively search for names in child namespaces first. */ | |
445 | ||
446 | struct symbol *sym; | |
447 | int new_scope_len = scope_len; | |
448 | ||
449 | /* If the current scope is followed by "::", skip past that. */ | |
450 | if (new_scope_len != 0) | |
451 | { | |
452 | gdb_assert (scope[new_scope_len] == ':'); | |
453 | new_scope_len += 2; | |
454 | } | |
455 | new_scope_len += cp_find_first_component (scope + new_scope_len); | |
456 | sym = lookup_namespace_scope (name, linkage_name, block, | |
21b556f4 | 457 | domain, scope, new_scope_len); |
1fcb5155 DC |
458 | if (sym != NULL) |
459 | return sym; | |
460 | } | |
461 | ||
462 | /* Okay, we didn't find a match in our children, so look for the | |
463 | name in the current namespace. */ | |
464 | ||
465 | namespace = alloca (scope_len + 1); | |
466 | strncpy (namespace, scope, scope_len); | |
467 | namespace[scope_len] = '\0'; | |
8540c487 SW |
468 | return cp_lookup_symbol_in_namespace (namespace, name, linkage_name, |
469 | block, domain); | |
1fcb5155 DC |
470 | } |
471 | ||
472 | /* Look up NAME in BLOCK's static block and in global blocks. If | |
473 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located | |
474 | within an anonymous namespace. Other arguments are as in | |
475 | cp_lookup_symbol_nonlocal. */ | |
476 | ||
477 | static struct symbol * | |
478 | lookup_symbol_file (const char *name, | |
479 | const char *linkage_name, | |
480 | const struct block *block, | |
481 | const domain_enum domain, | |
1fcb5155 DC |
482 | int anonymous_namespace) |
483 | { | |
484 | struct symbol *sym = NULL; | |
485 | ||
21b556f4 | 486 | sym = lookup_symbol_static (name, linkage_name, block, domain); |
1fcb5155 DC |
487 | if (sym != NULL) |
488 | return sym; | |
489 | ||
490 | if (anonymous_namespace) | |
491 | { | |
492 | /* Symbols defined in anonymous namespaces have external linkage | |
493 | but should be treated as local to a single file nonetheless. | |
494 | So we only search the current file's global block. */ | |
495 | ||
496 | const struct block *global_block = block_global_block (block); | |
497 | ||
498 | if (global_block != NULL) | |
5c4e30ca | 499 | sym = lookup_symbol_aux_block (name, linkage_name, global_block, |
21b556f4 | 500 | domain); |
1fcb5155 DC |
501 | } |
502 | else | |
503 | { | |
21b556f4 | 504 | sym = lookup_symbol_global (name, linkage_name, block, domain); |
5c4e30ca DC |
505 | } |
506 | ||
507 | if (sym != NULL) | |
508 | return sym; | |
509 | ||
510 | /* Now call "lookup_possible_namespace_symbol". Symbols in here | |
511 | claim to be associated to namespaces, but this claim might be | |
512 | incorrect: the names in question might actually correspond to | |
513 | classes instead of namespaces. But if they correspond to | |
514 | classes, then we should have found a match for them above. So if | |
515 | we find them now, they should be genuine. */ | |
516 | ||
517 | /* FIXME: carlton/2003-06-12: This is a hack and should eventually | |
518 | be deleted: see comments below. */ | |
519 | ||
520 | if (domain == VAR_DOMAIN) | |
521 | { | |
21b556f4 | 522 | sym = lookup_possible_namespace_symbol (name); |
5c4e30ca DC |
523 | if (sym != NULL) |
524 | return sym; | |
525 | } | |
526 | ||
527 | return NULL; | |
528 | } | |
529 | ||
79c2c32d DC |
530 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
531 | class or namespace given by PARENT_TYPE, from within the context | |
532 | given by BLOCK. Return NULL if there is no such nested type. */ | |
533 | ||
79c2c32d DC |
534 | struct type * |
535 | cp_lookup_nested_type (struct type *parent_type, | |
536 | const char *nested_name, | |
537 | const struct block *block) | |
538 | { | |
539 | switch (TYPE_CODE (parent_type)) | |
540 | { | |
63d06c5c | 541 | case TYPE_CODE_STRUCT: |
79c2c32d | 542 | case TYPE_CODE_NAMESPACE: |
48e32051 | 543 | case TYPE_CODE_UNION: |
79c2c32d | 544 | { |
63d06c5c DC |
545 | /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
546 | of classes like, say, data or function members. Instead, | |
547 | they're just represented by symbols whose names are | |
548 | qualified by the name of the surrounding class. This is | |
549 | just like members of namespaces; in particular, | |
550 | lookup_symbol_namespace works when looking them up. */ | |
551 | ||
79c2c32d | 552 | const char *parent_name = TYPE_TAG_NAME (parent_type); |
8540c487 SW |
553 | struct symbol *sym = cp_lookup_symbol_in_namespace (parent_name, |
554 | nested_name, | |
555 | NULL, | |
556 | block, | |
557 | VAR_DOMAIN); | |
79c2c32d DC |
558 | if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF) |
559 | return NULL; | |
560 | else | |
561 | return SYMBOL_TYPE (sym); | |
562 | } | |
563 | default: | |
564 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 565 | _("cp_lookup_nested_type called on a non-aggregate type.")); |
79c2c32d DC |
566 | } |
567 | } | |
568 | ||
b368761e DC |
569 | /* The C++-version of lookup_transparent_type. */ |
570 | ||
571 | /* FIXME: carlton/2004-01-16: The problem that this is trying to | |
572 | address is that, unfortunately, sometimes NAME is wrong: it may not | |
573 | include the name of namespaces enclosing the type in question. | |
574 | lookup_transparent_type gets called when the the type in question | |
575 | is a declaration, and we're trying to find its definition; but, for | |
576 | declarations, our type name deduction mechanism doesn't work. | |
577 | There's nothing we can do to fix this in general, I think, in the | |
578 | absence of debug information about namespaces (I've filed PR | |
579 | gdb/1511 about this); until such debug information becomes more | |
580 | prevalent, one heuristic which sometimes looks is to search for the | |
581 | definition in namespaces containing the current namespace. | |
582 | ||
583 | We should delete this functions once the appropriate debug | |
584 | information becomes more widespread. (GCC 3.4 will be the first | |
585 | released version of GCC with such information.) */ | |
586 | ||
587 | struct type * | |
588 | cp_lookup_transparent_type (const char *name) | |
589 | { | |
590 | /* First, try the honest way of looking up the definition. */ | |
591 | struct type *t = basic_lookup_transparent_type (name); | |
592 | const char *scope; | |
593 | ||
594 | if (t != NULL) | |
595 | return t; | |
596 | ||
597 | /* If that doesn't work and we're within a namespace, look there | |
598 | instead. */ | |
599 | scope = block_scope (get_selected_block (0)); | |
600 | ||
601 | if (scope[0] == '\0') | |
602 | return NULL; | |
603 | ||
604 | return cp_lookup_transparent_type_loop (name, scope, 0); | |
605 | } | |
606 | ||
607 | /* Lookup the the type definition associated to NAME in | |
608 | namespaces/classes containing SCOPE whose name is strictly longer | |
609 | than LENGTH. LENGTH must be the index of the start of a | |
610 | component of SCOPE. */ | |
611 | ||
612 | static struct type * | |
613 | cp_lookup_transparent_type_loop (const char *name, const char *scope, | |
614 | int length) | |
615 | { | |
1198ecbe | 616 | int scope_length = length + cp_find_first_component (scope + length); |
b368761e DC |
617 | char *full_name; |
618 | ||
619 | /* If the current scope is followed by "::", look in the next | |
620 | component. */ | |
621 | if (scope[scope_length] == ':') | |
622 | { | |
623 | struct type *retval | |
624 | = cp_lookup_transparent_type_loop (name, scope, scope_length + 2); | |
625 | if (retval != NULL) | |
626 | return retval; | |
627 | } | |
628 | ||
629 | full_name = alloca (scope_length + 2 + strlen (name) + 1); | |
630 | strncpy (full_name, scope, scope_length); | |
631 | strncpy (full_name + scope_length, "::", 2); | |
632 | strcpy (full_name + scope_length + 2, name); | |
633 | ||
634 | return basic_lookup_transparent_type (full_name); | |
635 | } | |
636 | ||
5c4e30ca DC |
637 | /* Now come functions for dealing with symbols associated to |
638 | namespaces. (They're used to store the namespaces themselves, not | |
639 | objects that live in the namespaces.) These symbols come in two | |
640 | varieties: if we run into a DW_TAG_namespace DIE, then we know that | |
641 | we have a namespace, so dwarf2read.c creates a symbol for it just | |
642 | like normal. But, unfortunately, versions of GCC through at least | |
643 | 3.3 don't generate those DIE's. Our solution is to try to guess | |
644 | their existence by looking at demangled names. This might cause us | |
645 | to misidentify classes as namespaces, however. So we put those | |
646 | symbols in a special block (one per objfile), and we only search | |
647 | that block as a last resort. */ | |
648 | ||
649 | /* FIXME: carlton/2003-06-12: Once versions of GCC that generate | |
650 | DW_TAG_namespace have been out for a year or two, we should get rid | |
651 | of all of this "possible namespace" nonsense. */ | |
652 | ||
653 | /* Allocate everything necessary for the possible namespace block | |
654 | associated to OBJFILE. */ | |
655 | ||
656 | static void | |
657 | initialize_namespace_symtab (struct objfile *objfile) | |
658 | { | |
659 | struct symtab *namespace_symtab; | |
660 | struct blockvector *bv; | |
661 | struct block *bl; | |
662 | ||
663 | namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); | |
664 | namespace_symtab->language = language_cplus; | |
665 | namespace_symtab->free_code = free_nothing; | |
666 | namespace_symtab->dirname = NULL; | |
667 | ||
4a146b47 | 668 | bv = obstack_alloc (&objfile->objfile_obstack, |
5c4e30ca DC |
669 | sizeof (struct blockvector) |
670 | + FIRST_LOCAL_BLOCK * sizeof (struct block *)); | |
671 | BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; | |
672 | BLOCKVECTOR (namespace_symtab) = bv; | |
673 | ||
674 | /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ | |
675 | ||
4a146b47 EZ |
676 | bl = allocate_block (&objfile->objfile_obstack); |
677 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
678 | NULL); |
679 | BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; | |
4a146b47 EZ |
680 | bl = allocate_block (&objfile->objfile_obstack); |
681 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
682 | NULL); |
683 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; | |
684 | ||
685 | /* Allocate the possible namespace block; we put it where the first | |
686 | local block will live, though I don't think there's any need to | |
687 | pretend that it's actually a local block (e.g. by setting | |
688 | BLOCK_SUPERBLOCK appropriately). We don't use the global or | |
689 | static block because we don't want it searched during the normal | |
690 | search of all global/static blocks in lookup_symbol: we only want | |
691 | it used as a last resort. */ | |
692 | ||
693 | /* NOTE: carlton/2003-09-11: I considered not associating the fake | |
694 | symbols to a block/symtab at all. But that would cause problems | |
695 | with lookup_symbol's SYMTAB argument and with block_found, so | |
696 | having a symtab/block for this purpose seems like the best | |
697 | solution for now. */ | |
698 | ||
4a146b47 | 699 | bl = allocate_block (&objfile->objfile_obstack); |
5c4e30ca DC |
700 | BLOCK_DICT (bl) = dict_create_hashed_expandable (); |
701 | BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; | |
702 | ||
703 | namespace_symtab->free_func = free_namespace_block; | |
704 | ||
705 | objfile->cp_namespace_symtab = namespace_symtab; | |
706 | } | |
707 | ||
708 | /* Locate the possible namespace block associated to OBJFILE, | |
709 | allocating it if necessary. */ | |
710 | ||
711 | static struct block * | |
712 | get_possible_namespace_block (struct objfile *objfile) | |
713 | { | |
714 | if (objfile->cp_namespace_symtab == NULL) | |
715 | initialize_namespace_symtab (objfile); | |
716 | ||
717 | return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), | |
718 | FIRST_LOCAL_BLOCK); | |
719 | } | |
720 | ||
721 | /* Free the dictionary associated to the possible namespace block. */ | |
722 | ||
723 | static void | |
724 | free_namespace_block (struct symtab *symtab) | |
725 | { | |
726 | struct block *possible_namespace_block; | |
727 | ||
728 | possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), | |
729 | FIRST_LOCAL_BLOCK); | |
730 | gdb_assert (possible_namespace_block != NULL); | |
731 | dict_free (BLOCK_DICT (possible_namespace_block)); | |
732 | } | |
733 | ||
734 | /* Ensure that there are symbols in the possible namespace block | |
735 | associated to OBJFILE for all initial substrings of NAME that look | |
736 | like namespaces or classes. NAME should end in a member variable: | |
737 | it shouldn't consist solely of namespaces. */ | |
738 | ||
739 | void | |
740 | cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) | |
741 | { | |
742 | check_possible_namespace_symbols_loop (name, | |
743 | cp_find_first_component (name), | |
744 | objfile); | |
745 | } | |
746 | ||
747 | /* This is a helper loop for cp_check_possible_namespace_symbols; it | |
748 | ensures that there are symbols in the possible namespace block | |
749 | associated to OBJFILE for all namespaces that are initial | |
750 | substrings of NAME of length at least LEN. It returns 1 if a | |
751 | previous loop had already created the shortest such symbol and 0 | |
752 | otherwise. | |
753 | ||
754 | This function assumes that if there is already a symbol associated | |
755 | to a substring of NAME of a given length, then there are already | |
756 | symbols associated to all substrings of NAME whose length is less | |
757 | than that length. So if cp_check_possible_namespace_symbols has | |
758 | been called once with argument "A::B::C::member", then that will | |
759 | create symbols "A", "A::B", and "A::B::C". If it is then later | |
760 | called with argument "A::B::D::member", then the new call will | |
761 | generate a new symbol for "A::B::D", but once it sees that "A::B" | |
762 | has already been created, it doesn't bother checking to see if "A" | |
763 | has also been created. */ | |
764 | ||
765 | static int | |
766 | check_possible_namespace_symbols_loop (const char *name, int len, | |
767 | struct objfile *objfile) | |
768 | { | |
769 | if (name[len] == ':') | |
770 | { | |
771 | int done; | |
772 | int next_len = len + 2; | |
773 | ||
774 | next_len += cp_find_first_component (name + next_len); | |
775 | done = check_possible_namespace_symbols_loop (name, next_len, | |
776 | objfile); | |
777 | ||
778 | if (!done) | |
779 | done = check_one_possible_namespace_symbol (name, len, objfile); | |
780 | ||
781 | return done; | |
1fcb5155 | 782 | } |
5c4e30ca DC |
783 | else |
784 | return 0; | |
785 | } | |
786 | ||
787 | /* Check to see if there's already a possible namespace symbol in | |
788 | OBJFILE whose name is the initial substring of NAME of length LEN. | |
789 | If not, create one and return 0; otherwise, return 1. */ | |
790 | ||
791 | static int | |
792 | check_one_possible_namespace_symbol (const char *name, int len, | |
793 | struct objfile *objfile) | |
794 | { | |
795 | struct block *block = get_possible_namespace_block (objfile); | |
ec5cdd75 DJ |
796 | char *name_copy = alloca (len + 1); |
797 | struct symbol *sym; | |
798 | ||
799 | memcpy (name_copy, name, len); | |
800 | name_copy[len] = '\0'; | |
801 | sym = lookup_block_symbol (block, name_copy, NULL, VAR_DOMAIN); | |
5c4e30ca DC |
802 | |
803 | if (sym == NULL) | |
804 | { | |
ec5cdd75 | 805 | struct type *type; |
ec5cdd75 DJ |
806 | |
807 | type = init_type (TYPE_CODE_NAMESPACE, 0, 0, name_copy, objfile); | |
808 | ||
5c4e30ca DC |
809 | TYPE_TAG_NAME (type) = TYPE_NAME (type); |
810 | ||
4a146b47 | 811 | sym = obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); |
5c4e30ca DC |
812 | memset (sym, 0, sizeof (struct symbol)); |
813 | SYMBOL_LANGUAGE (sym) = language_cplus; | |
04a679b8 TT |
814 | /* Note that init_type copied the name to the objfile's |
815 | obstack. */ | |
816 | SYMBOL_SET_NAMES (sym, TYPE_NAME (type), len, 0, objfile); | |
5c4e30ca DC |
817 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; |
818 | SYMBOL_TYPE (sym) = type; | |
819 | SYMBOL_DOMAIN (sym) = VAR_DOMAIN; | |
820 | ||
821 | dict_add_symbol (BLOCK_DICT (block), sym); | |
822 | ||
823 | return 0; | |
824 | } | |
825 | else | |
ec5cdd75 | 826 | return 1; |
5c4e30ca DC |
827 | } |
828 | ||
829 | /* Look for a symbol named NAME in all the possible namespace blocks. | |
21b556f4 | 830 | If one is found, return it. */ |
5c4e30ca DC |
831 | |
832 | static struct symbol * | |
21b556f4 | 833 | lookup_possible_namespace_symbol (const char *name) |
5c4e30ca DC |
834 | { |
835 | struct objfile *objfile; | |
836 | ||
837 | ALL_OBJFILES (objfile) | |
838 | { | |
839 | struct symbol *sym; | |
840 | ||
841 | sym = lookup_block_symbol (get_possible_namespace_block (objfile), | |
842 | name, NULL, VAR_DOMAIN); | |
843 | ||
844 | if (sym != NULL) | |
21b556f4 | 845 | return sym; |
5c4e30ca DC |
846 | } |
847 | ||
848 | return NULL; | |
849 | } | |
850 | ||
851 | /* Print out all the possible namespace symbols. */ | |
852 | ||
853 | static void | |
854 | maintenance_cplus_namespace (char *args, int from_tty) | |
855 | { | |
856 | struct objfile *objfile; | |
a3f17187 | 857 | printf_unfiltered (_("Possible namespaces:\n")); |
5c4e30ca DC |
858 | ALL_OBJFILES (objfile) |
859 | { | |
860 | struct dict_iterator iter; | |
861 | struct symbol *sym; | |
862 | ||
863 | ALL_BLOCK_SYMBOLS (get_possible_namespace_block (objfile), iter, sym) | |
864 | { | |
865 | printf_unfiltered ("%s\n", SYMBOL_PRINT_NAME (sym)); | |
866 | } | |
867 | } | |
868 | } | |
869 | ||
2c0b251b PA |
870 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
871 | extern initialize_file_ftype _initialize_cp_namespace; | |
872 | ||
5c4e30ca DC |
873 | void |
874 | _initialize_cp_namespace (void) | |
875 | { | |
876 | add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, | |
1a966eab | 877 | _("Print the list of possible C++ namespaces."), |
5c4e30ca | 878 | &maint_cplus_cmd_list); |
1fcb5155 | 879 | } |