Commit | Line | Data |
---|---|---|
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; | |
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 | { | |
8c902bb1 SW |
102 | int dest_len = (previous_component == 0 ? 0 : previous_component - 2); |
103 | int src_len = next_component; | |
794684b6 | 104 | |
8c902bb1 SW |
105 | char *dest = alloca (dest_len + 1); |
106 | char *src = alloca (src_len + 1); | |
794684b6 | 107 | |
8c902bb1 SW |
108 | memcpy (dest, name, dest_len); |
109 | memcpy (src, name, src_len); | |
794684b6 | 110 | |
8c902bb1 SW |
111 | dest[dest_len] = '\0'; |
112 | src[src_len] = '\0'; | |
794684b6 | 113 | |
9219021c DC |
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. */ | |
c0cc3a76 SW |
118 | cp_add_using_directive (dest, src, NULL, |
119 | &SYMBOL_SYMTAB (symbol)->objfile->objfile_obstack); | |
9219021c DC |
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 | ||
c0cc3a76 SW |
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 | The arguments are copied into newly allocated memory so they can be | |
137 | temporaries. */ | |
9219021c DC |
138 | |
139 | void | |
c0cc3a76 SW |
140 | cp_add_using_directive (const char *dest, const char *src, const char *alias, |
141 | struct obstack *obstack) | |
9219021c DC |
142 | { |
143 | struct using_direct *current; | |
144 | struct using_direct *new; | |
145 | ||
146 | /* Has it already been added? */ | |
147 | ||
27aa8d6a | 148 | for (current = using_directives; current != NULL; current = current->next) |
9219021c | 149 | { |
8c902bb1 | 150 | if (strcmp (current->import_src, src) == 0 |
c0cc3a76 SW |
151 | && strcmp (current->import_dest, dest) == 0 |
152 | && ((alias == NULL && current->alias == NULL) | |
153 | || (alias != NULL && current->alias != NULL | |
154 | && strcmp (alias, current->alias) == 0))) | |
9219021c DC |
155 | return; |
156 | } | |
157 | ||
c0cc3a76 SW |
158 | new = OBSTACK_ZALLOC (obstack, struct using_direct); |
159 | ||
160 | new->import_src = obsavestring (src, strlen (src), obstack); | |
161 | new->import_dest = obsavestring (dest, strlen (dest), obstack); | |
794684b6 | 162 | |
c0cc3a76 SW |
163 | if (alias != NULL) |
164 | new->alias = obsavestring (alias, strlen (alias), obstack); | |
165 | ||
166 | new->next = using_directives; | |
167 | using_directives = new; | |
9219021c DC |
168 | } |
169 | ||
170 | /* Record the namespace that the function defined by SYMBOL was | |
171 | defined in, if necessary. BLOCK is the associated block; use | |
172 | OBSTACK for allocation. */ | |
173 | ||
174 | void | |
175 | cp_set_block_scope (const struct symbol *symbol, | |
176 | struct block *block, | |
df8a16a1 DJ |
177 | struct obstack *obstack, |
178 | const char *processing_current_prefix, | |
179 | int processing_has_namespace_info) | |
9219021c | 180 | { |
df8a16a1 | 181 | if (processing_has_namespace_info) |
9219021c | 182 | { |
df8a16a1 DJ |
183 | block_set_scope |
184 | (block, obsavestring (processing_current_prefix, | |
185 | strlen (processing_current_prefix), | |
186 | obstack), | |
187 | obstack); | |
188 | } | |
189 | else if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) | |
190 | { | |
191 | /* Try to figure out the appropriate namespace from the | |
192 | demangled name. */ | |
9219021c | 193 | |
df8a16a1 DJ |
194 | /* FIXME: carlton/2003-04-15: If the function in question is |
195 | a method of a class, the name will actually include the | |
196 | name of the class as well. This should be harmless, but | |
197 | is a little unfortunate. */ | |
9219021c | 198 | |
df8a16a1 DJ |
199 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
200 | unsigned int prefix_len = cp_entire_prefix_len (name); | |
9219021c | 201 | |
df8a16a1 DJ |
202 | block_set_scope (block, |
203 | obsavestring (name, prefix_len, obstack), | |
204 | obstack); | |
9219021c DC |
205 | } |
206 | } | |
207 | ||
208 | /* Test whether or not NAMESPACE looks like it mentions an anonymous | |
209 | namespace; return nonzero if so. */ | |
210 | ||
211 | int | |
212 | cp_is_anonymous (const char *namespace) | |
213 | { | |
214 | return (strstr (namespace, "(anonymous namespace)") | |
215 | != NULL); | |
216 | } | |
217 | ||
1fcb5155 DC |
218 | /* The C++-specific version of name lookup for static and global |
219 | names. This makes sure that names get looked for in all namespaces | |
220 | that are in scope. NAME is the natural name of the symbol that | |
94af9270 KS |
221 | we're looking for, BLOCK is the block that we're searching within, |
222 | DOMAIN says what kind of symbols we're looking for, and if SYMTAB is | |
223 | non-NULL, we should store the symtab where we found the symbol in it. */ | |
1fcb5155 DC |
224 | |
225 | struct symbol * | |
226 | cp_lookup_symbol_nonlocal (const char *name, | |
1fcb5155 | 227 | const struct block *block, |
21b556f4 | 228 | const domain_enum domain) |
1fcb5155 | 229 | { |
8540c487 SW |
230 | struct symbol *sym; |
231 | const char *scope = block_scope (block); | |
232 | ||
94af9270 | 233 | sym = lookup_namespace_scope (name, block, domain, scope, 0); |
8540c487 SW |
234 | if (sym != NULL) |
235 | return sym; | |
236 | ||
94af9270 | 237 | return cp_lookup_symbol_namespace (scope, name, block, domain, 1); |
8540c487 SW |
238 | } |
239 | ||
240 | /* Look up NAME in the C++ namespace NAMESPACE. Other arguments are as in | |
241 | cp_lookup_symbol_nonlocal. */ | |
242 | ||
243 | static struct symbol * | |
244 | cp_lookup_symbol_in_namespace (const char *namespace, | |
245 | const char *name, | |
8540c487 SW |
246 | const struct block *block, |
247 | const domain_enum domain) | |
248 | { | |
249 | if (namespace[0] == '\0') | |
250 | { | |
94af9270 | 251 | return lookup_symbol_file (name, block, domain, 0); |
8540c487 SW |
252 | } |
253 | else | |
254 | { | |
255 | char *concatenated_name = alloca (strlen (namespace) + 2 + | |
256 | strlen (name+ 1)); | |
257 | strcpy (concatenated_name, namespace); | |
258 | strcat (concatenated_name, "::"); | |
259 | strcat (concatenated_name, name); | |
94af9270 KS |
260 | return lookup_symbol_file (concatenated_name, block, |
261 | domain,cp_is_anonymous (namespace)); | |
8540c487 SW |
262 | } |
263 | } | |
264 | ||
b14e635e SW |
265 | /* Used for cleanups to reset the "searched" flag incase |
266 | of an error. */ | |
267 | ||
268 | static void | |
269 | reset_directive_searched (void *data) | |
270 | { | |
271 | struct using_direct *direct = data; | |
272 | direct->searched = 0; | |
273 | } | |
274 | ||
8540c487 | 275 | /* Search for NAME by applying all import statements belonging |
b14e635e SW |
276 | to BLOCK which are applicable in SCOPE. |
277 | If SEARCH_PARENTS the search will include imports which are applicable in | |
278 | parents of SCOPE. | |
279 | Example: | |
280 | ||
281 | namespace A{ | |
282 | using namespace X; | |
283 | namespace B{ | |
284 | using namespace Y; | |
285 | } | |
286 | } | |
287 | ||
288 | If SCOPE is "A::B" and SEARCH_PARENTS is true the imports of namespaces X | |
289 | and Y will be considered. If SEARCH_PARENTS is false only the import of Y | |
290 | is considered. */ | |
8540c487 SW |
291 | |
292 | static struct symbol * | |
293 | cp_lookup_symbol_imports (const char *scope, | |
294 | const char *name, | |
8540c487 | 295 | const struct block *block, |
b14e635e SW |
296 | const domain_enum domain, |
297 | const int search_parents) | |
8540c487 | 298 | { |
b14e635e | 299 | struct using_direct *current; |
8540c487 SW |
300 | struct symbol *sym; |
301 | int len; | |
b14e635e SW |
302 | int directive_match; |
303 | struct cleanup *searched_cleanup; | |
8540c487 SW |
304 | |
305 | /* First, try to find the symbol in the given namespace. */ | |
94af9270 | 306 | sym = cp_lookup_symbol_in_namespace (scope, name, block, domain); |
8540c487 SW |
307 | if (sym != NULL) |
308 | return sym; | |
309 | ||
310 | /* Go through the using directives. If any of them add new | |
311 | names to the namespace we're searching in, see if we can find a | |
312 | match by applying them. */ | |
313 | ||
314 | for (current = block_using (block); | |
315 | current != NULL; | |
316 | current = current->next) | |
317 | { | |
b14e635e SW |
318 | len = strlen (current->import_dest); |
319 | directive_match = (search_parents | |
320 | ? (strncmp (scope, current->import_dest, | |
321 | strlen (current->import_dest)) == 0 | |
322 | && (len == 0 | |
323 | || scope[len] == ':' || scope[len] == '\0')) | |
324 | : strcmp (scope, current->import_dest) == 0); | |
8540c487 SW |
325 | |
326 | /* If the import destination is the current scope or one of its ancestors then | |
327 | it is applicable. */ | |
b14e635e | 328 | if (directive_match && !current->searched) |
8540c487 | 329 | { |
b14e635e SW |
330 | /* Mark this import as searched so that the recursive call does not |
331 | search it again. */ | |
332 | current->searched = 1; | |
333 | searched_cleanup = make_cleanup (reset_directive_searched, current); | |
334 | ||
82856980 SW |
335 | if (current->alias != NULL && strcmp (name, current->alias) == 0) |
336 | /* If the import is creating an alias and the alias matches the | |
337 | sought name. Pass current->import_src as the NAME to direct the | |
338 | search towards the aliased namespace. */ | |
339 | { | |
340 | sym = cp_lookup_symbol_in_namespace (scope, | |
341 | current->import_src, | |
82856980 SW |
342 | block, |
343 | domain); | |
344 | } | |
345 | else if (current->alias == NULL) | |
346 | { | |
347 | /* If this import statement creates no alias, pass current->inner as | |
348 | NAMESPACE to direct the search towards the imported namespace. */ | |
349 | sym = cp_lookup_symbol_imports (current->import_src, | |
350 | name, | |
82856980 SW |
351 | block, |
352 | domain, | |
353 | 0); | |
354 | } | |
b14e635e SW |
355 | current->searched = 0; |
356 | discard_cleanups (searched_cleanup); | |
357 | ||
358 | if (sym != NULL) | |
359 | return sym; | |
8540c487 SW |
360 | } |
361 | } | |
362 | ||
363 | return NULL; | |
364 | } | |
365 | ||
8540c487 SW |
366 | /* Searches for NAME in the current namespace, and by applying relevant import |
367 | statements belonging to BLOCK and its parents. SCOPE is the namespace scope | |
368 | of the context in which the search is being evaluated. */ | |
369 | ||
370 | struct symbol* | |
371 | cp_lookup_symbol_namespace (const char *scope, | |
372 | const char *name, | |
8540c487 | 373 | const struct block *block, |
b14e635e SW |
374 | const domain_enum domain, |
375 | const int search_parents) | |
8540c487 SW |
376 | { |
377 | struct symbol *sym; | |
378 | ||
379 | /* Search for name in namespaces imported to this and parent blocks. */ | |
380 | while (block != NULL) | |
381 | { | |
94af9270 | 382 | sym = cp_lookup_symbol_imports (scope, name, block, domain, |
b14e635e | 383 | search_parents); |
8540c487 SW |
384 | |
385 | if (sym) | |
386 | return sym; | |
387 | ||
388 | block = BLOCK_SUPERBLOCK (block); | |
389 | } | |
390 | ||
391 | return NULL; | |
1fcb5155 DC |
392 | } |
393 | ||
394 | /* Lookup NAME at namespace scope (or, in C terms, in static and | |
395 | global variables). SCOPE is the namespace that the current | |
396 | function is defined within; only consider namespaces whose length | |
397 | is at least SCOPE_LEN. Other arguments are as in | |
398 | cp_lookup_symbol_nonlocal. | |
399 | ||
400 | For example, if we're within a function A::B::f and looking for a | |
3882f37a | 401 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
1fcb5155 DC |
402 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
403 | but with SCOPE_LEN = 1. And then it calls itself with NAME and | |
404 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for | |
405 | "A::B::x"; if it doesn't find it, then the second call looks for | |
406 | "A::x", and if that call fails, then the first call looks for | |
407 | "x". */ | |
408 | ||
409 | static struct symbol * | |
410 | lookup_namespace_scope (const char *name, | |
1fcb5155 DC |
411 | const struct block *block, |
412 | const domain_enum domain, | |
1fcb5155 DC |
413 | const char *scope, |
414 | int scope_len) | |
415 | { | |
416 | char *namespace; | |
417 | ||
418 | if (scope[scope_len] != '\0') | |
419 | { | |
420 | /* Recursively search for names in child namespaces first. */ | |
421 | ||
422 | struct symbol *sym; | |
423 | int new_scope_len = scope_len; | |
424 | ||
425 | /* If the current scope is followed by "::", skip past that. */ | |
426 | if (new_scope_len != 0) | |
427 | { | |
428 | gdb_assert (scope[new_scope_len] == ':'); | |
429 | new_scope_len += 2; | |
430 | } | |
431 | new_scope_len += cp_find_first_component (scope + new_scope_len); | |
94af9270 | 432 | sym = lookup_namespace_scope (name, block, domain, scope, new_scope_len); |
1fcb5155 DC |
433 | if (sym != NULL) |
434 | return sym; | |
435 | } | |
436 | ||
437 | /* Okay, we didn't find a match in our children, so look for the | |
438 | name in the current namespace. */ | |
439 | ||
440 | namespace = alloca (scope_len + 1); | |
441 | strncpy (namespace, scope, scope_len); | |
442 | namespace[scope_len] = '\0'; | |
94af9270 | 443 | return cp_lookup_symbol_in_namespace (namespace, name, block, domain); |
1fcb5155 DC |
444 | } |
445 | ||
446 | /* Look up NAME in BLOCK's static block and in global blocks. If | |
447 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located | |
448 | within an anonymous namespace. Other arguments are as in | |
449 | cp_lookup_symbol_nonlocal. */ | |
450 | ||
451 | static struct symbol * | |
452 | lookup_symbol_file (const char *name, | |
1fcb5155 DC |
453 | const struct block *block, |
454 | const domain_enum domain, | |
1fcb5155 DC |
455 | int anonymous_namespace) |
456 | { | |
457 | struct symbol *sym = NULL; | |
458 | ||
94af9270 | 459 | sym = lookup_symbol_static (name, block, domain); |
1fcb5155 DC |
460 | if (sym != NULL) |
461 | return sym; | |
462 | ||
463 | if (anonymous_namespace) | |
464 | { | |
465 | /* Symbols defined in anonymous namespaces have external linkage | |
466 | but should be treated as local to a single file nonetheless. | |
467 | So we only search the current file's global block. */ | |
468 | ||
469 | const struct block *global_block = block_global_block (block); | |
470 | ||
471 | if (global_block != NULL) | |
94af9270 | 472 | sym = lookup_symbol_aux_block (name, global_block, domain); |
1fcb5155 DC |
473 | } |
474 | else | |
475 | { | |
94af9270 | 476 | sym = lookup_symbol_global (name, block, domain); |
5c4e30ca DC |
477 | } |
478 | ||
479 | if (sym != NULL) | |
480 | return sym; | |
481 | ||
482 | /* Now call "lookup_possible_namespace_symbol". Symbols in here | |
483 | claim to be associated to namespaces, but this claim might be | |
484 | incorrect: the names in question might actually correspond to | |
485 | classes instead of namespaces. But if they correspond to | |
486 | classes, then we should have found a match for them above. So if | |
487 | we find them now, they should be genuine. */ | |
488 | ||
489 | /* FIXME: carlton/2003-06-12: This is a hack and should eventually | |
490 | be deleted: see comments below. */ | |
491 | ||
492 | if (domain == VAR_DOMAIN) | |
493 | { | |
21b556f4 | 494 | sym = lookup_possible_namespace_symbol (name); |
5c4e30ca DC |
495 | if (sym != NULL) |
496 | return sym; | |
497 | } | |
498 | ||
499 | return NULL; | |
500 | } | |
501 | ||
79c2c32d DC |
502 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
503 | class or namespace given by PARENT_TYPE, from within the context | |
504 | given by BLOCK. Return NULL if there is no such nested type. */ | |
505 | ||
79c2c32d DC |
506 | struct type * |
507 | cp_lookup_nested_type (struct type *parent_type, | |
508 | const char *nested_name, | |
509 | const struct block *block) | |
510 | { | |
511 | switch (TYPE_CODE (parent_type)) | |
512 | { | |
63d06c5c | 513 | case TYPE_CODE_STRUCT: |
79c2c32d | 514 | case TYPE_CODE_NAMESPACE: |
48e32051 | 515 | case TYPE_CODE_UNION: |
79c2c32d | 516 | { |
63d06c5c DC |
517 | /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
518 | of classes like, say, data or function members. Instead, | |
519 | they're just represented by symbols whose names are | |
520 | qualified by the name of the surrounding class. This is | |
521 | just like members of namespaces; in particular, | |
522 | lookup_symbol_namespace works when looking them up. */ | |
523 | ||
79c2c32d | 524 | const char *parent_name = TYPE_TAG_NAME (parent_type); |
8540c487 SW |
525 | struct symbol *sym = cp_lookup_symbol_in_namespace (parent_name, |
526 | nested_name, | |
8540c487 SW |
527 | block, |
528 | VAR_DOMAIN); | |
79c2c32d DC |
529 | if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF) |
530 | return NULL; | |
531 | else | |
532 | return SYMBOL_TYPE (sym); | |
533 | } | |
534 | default: | |
535 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 536 | _("cp_lookup_nested_type called on a non-aggregate type.")); |
79c2c32d DC |
537 | } |
538 | } | |
539 | ||
b368761e DC |
540 | /* The C++-version of lookup_transparent_type. */ |
541 | ||
542 | /* FIXME: carlton/2004-01-16: The problem that this is trying to | |
543 | address is that, unfortunately, sometimes NAME is wrong: it may not | |
544 | include the name of namespaces enclosing the type in question. | |
545 | lookup_transparent_type gets called when the the type in question | |
546 | is a declaration, and we're trying to find its definition; but, for | |
547 | declarations, our type name deduction mechanism doesn't work. | |
548 | There's nothing we can do to fix this in general, I think, in the | |
549 | absence of debug information about namespaces (I've filed PR | |
550 | gdb/1511 about this); until such debug information becomes more | |
551 | prevalent, one heuristic which sometimes looks is to search for the | |
552 | definition in namespaces containing the current namespace. | |
553 | ||
554 | We should delete this functions once the appropriate debug | |
555 | information becomes more widespread. (GCC 3.4 will be the first | |
556 | released version of GCC with such information.) */ | |
557 | ||
558 | struct type * | |
559 | cp_lookup_transparent_type (const char *name) | |
560 | { | |
561 | /* First, try the honest way of looking up the definition. */ | |
562 | struct type *t = basic_lookup_transparent_type (name); | |
563 | const char *scope; | |
564 | ||
565 | if (t != NULL) | |
566 | return t; | |
567 | ||
568 | /* If that doesn't work and we're within a namespace, look there | |
569 | instead. */ | |
570 | scope = block_scope (get_selected_block (0)); | |
571 | ||
572 | if (scope[0] == '\0') | |
573 | return NULL; | |
574 | ||
575 | return cp_lookup_transparent_type_loop (name, scope, 0); | |
576 | } | |
577 | ||
578 | /* Lookup the the type definition associated to NAME in | |
579 | namespaces/classes containing SCOPE whose name is strictly longer | |
580 | than LENGTH. LENGTH must be the index of the start of a | |
581 | component of SCOPE. */ | |
582 | ||
583 | static struct type * | |
584 | cp_lookup_transparent_type_loop (const char *name, const char *scope, | |
585 | int length) | |
586 | { | |
1198ecbe | 587 | int scope_length = length + cp_find_first_component (scope + length); |
b368761e DC |
588 | char *full_name; |
589 | ||
590 | /* If the current scope is followed by "::", look in the next | |
591 | component. */ | |
592 | if (scope[scope_length] == ':') | |
593 | { | |
594 | struct type *retval | |
595 | = cp_lookup_transparent_type_loop (name, scope, scope_length + 2); | |
596 | if (retval != NULL) | |
597 | return retval; | |
598 | } | |
599 | ||
600 | full_name = alloca (scope_length + 2 + strlen (name) + 1); | |
601 | strncpy (full_name, scope, scope_length); | |
602 | strncpy (full_name + scope_length, "::", 2); | |
603 | strcpy (full_name + scope_length + 2, name); | |
604 | ||
605 | return basic_lookup_transparent_type (full_name); | |
606 | } | |
607 | ||
5c4e30ca DC |
608 | /* Now come functions for dealing with symbols associated to |
609 | namespaces. (They're used to store the namespaces themselves, not | |
610 | objects that live in the namespaces.) These symbols come in two | |
611 | varieties: if we run into a DW_TAG_namespace DIE, then we know that | |
612 | we have a namespace, so dwarf2read.c creates a symbol for it just | |
613 | like normal. But, unfortunately, versions of GCC through at least | |
614 | 3.3 don't generate those DIE's. Our solution is to try to guess | |
615 | their existence by looking at demangled names. This might cause us | |
616 | to misidentify classes as namespaces, however. So we put those | |
617 | symbols in a special block (one per objfile), and we only search | |
618 | that block as a last resort. */ | |
619 | ||
620 | /* FIXME: carlton/2003-06-12: Once versions of GCC that generate | |
621 | DW_TAG_namespace have been out for a year or two, we should get rid | |
622 | of all of this "possible namespace" nonsense. */ | |
623 | ||
624 | /* Allocate everything necessary for the possible namespace block | |
625 | associated to OBJFILE. */ | |
626 | ||
627 | static void | |
628 | initialize_namespace_symtab (struct objfile *objfile) | |
629 | { | |
630 | struct symtab *namespace_symtab; | |
631 | struct blockvector *bv; | |
632 | struct block *bl; | |
633 | ||
634 | namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); | |
635 | namespace_symtab->language = language_cplus; | |
636 | namespace_symtab->free_code = free_nothing; | |
637 | namespace_symtab->dirname = NULL; | |
638 | ||
4a146b47 | 639 | bv = obstack_alloc (&objfile->objfile_obstack, |
5c4e30ca DC |
640 | sizeof (struct blockvector) |
641 | + FIRST_LOCAL_BLOCK * sizeof (struct block *)); | |
642 | BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; | |
643 | BLOCKVECTOR (namespace_symtab) = bv; | |
644 | ||
645 | /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ | |
646 | ||
4a146b47 EZ |
647 | bl = allocate_block (&objfile->objfile_obstack); |
648 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
649 | NULL); |
650 | BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; | |
4a146b47 EZ |
651 | bl = allocate_block (&objfile->objfile_obstack); |
652 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
653 | NULL); |
654 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; | |
655 | ||
656 | /* Allocate the possible namespace block; we put it where the first | |
657 | local block will live, though I don't think there's any need to | |
658 | pretend that it's actually a local block (e.g. by setting | |
659 | BLOCK_SUPERBLOCK appropriately). We don't use the global or | |
660 | static block because we don't want it searched during the normal | |
661 | search of all global/static blocks in lookup_symbol: we only want | |
662 | it used as a last resort. */ | |
663 | ||
664 | /* NOTE: carlton/2003-09-11: I considered not associating the fake | |
665 | symbols to a block/symtab at all. But that would cause problems | |
666 | with lookup_symbol's SYMTAB argument and with block_found, so | |
667 | having a symtab/block for this purpose seems like the best | |
668 | solution for now. */ | |
669 | ||
4a146b47 | 670 | bl = allocate_block (&objfile->objfile_obstack); |
5c4e30ca DC |
671 | BLOCK_DICT (bl) = dict_create_hashed_expandable (); |
672 | BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; | |
673 | ||
674 | namespace_symtab->free_func = free_namespace_block; | |
675 | ||
676 | objfile->cp_namespace_symtab = namespace_symtab; | |
677 | } | |
678 | ||
679 | /* Locate the possible namespace block associated to OBJFILE, | |
680 | allocating it if necessary. */ | |
681 | ||
682 | static struct block * | |
683 | get_possible_namespace_block (struct objfile *objfile) | |
684 | { | |
685 | if (objfile->cp_namespace_symtab == NULL) | |
686 | initialize_namespace_symtab (objfile); | |
687 | ||
688 | return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), | |
689 | FIRST_LOCAL_BLOCK); | |
690 | } | |
691 | ||
692 | /* Free the dictionary associated to the possible namespace block. */ | |
693 | ||
694 | static void | |
695 | free_namespace_block (struct symtab *symtab) | |
696 | { | |
697 | struct block *possible_namespace_block; | |
698 | ||
699 | possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), | |
700 | FIRST_LOCAL_BLOCK); | |
701 | gdb_assert (possible_namespace_block != NULL); | |
702 | dict_free (BLOCK_DICT (possible_namespace_block)); | |
703 | } | |
704 | ||
705 | /* Ensure that there are symbols in the possible namespace block | |
706 | associated to OBJFILE for all initial substrings of NAME that look | |
707 | like namespaces or classes. NAME should end in a member variable: | |
708 | it shouldn't consist solely of namespaces. */ | |
709 | ||
710 | void | |
711 | cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) | |
712 | { | |
713 | check_possible_namespace_symbols_loop (name, | |
714 | cp_find_first_component (name), | |
715 | objfile); | |
716 | } | |
717 | ||
718 | /* This is a helper loop for cp_check_possible_namespace_symbols; it | |
719 | ensures that there are symbols in the possible namespace block | |
720 | associated to OBJFILE for all namespaces that are initial | |
721 | substrings of NAME of length at least LEN. It returns 1 if a | |
722 | previous loop had already created the shortest such symbol and 0 | |
723 | otherwise. | |
724 | ||
725 | This function assumes that if there is already a symbol associated | |
726 | to a substring of NAME of a given length, then there are already | |
727 | symbols associated to all substrings of NAME whose length is less | |
728 | than that length. So if cp_check_possible_namespace_symbols has | |
729 | been called once with argument "A::B::C::member", then that will | |
730 | create symbols "A", "A::B", and "A::B::C". If it is then later | |
731 | called with argument "A::B::D::member", then the new call will | |
732 | generate a new symbol for "A::B::D", but once it sees that "A::B" | |
733 | has already been created, it doesn't bother checking to see if "A" | |
734 | has also been created. */ | |
735 | ||
736 | static int | |
737 | check_possible_namespace_symbols_loop (const char *name, int len, | |
738 | struct objfile *objfile) | |
739 | { | |
740 | if (name[len] == ':') | |
741 | { | |
742 | int done; | |
743 | int next_len = len + 2; | |
744 | ||
745 | next_len += cp_find_first_component (name + next_len); | |
746 | done = check_possible_namespace_symbols_loop (name, next_len, | |
747 | objfile); | |
748 | ||
749 | if (!done) | |
750 | done = check_one_possible_namespace_symbol (name, len, objfile); | |
751 | ||
752 | return done; | |
1fcb5155 | 753 | } |
5c4e30ca DC |
754 | else |
755 | return 0; | |
756 | } | |
757 | ||
758 | /* Check to see if there's already a possible namespace symbol in | |
759 | OBJFILE whose name is the initial substring of NAME of length LEN. | |
760 | If not, create one and return 0; otherwise, return 1. */ | |
761 | ||
762 | static int | |
763 | check_one_possible_namespace_symbol (const char *name, int len, | |
764 | struct objfile *objfile) | |
765 | { | |
766 | struct block *block = get_possible_namespace_block (objfile); | |
ec5cdd75 DJ |
767 | char *name_copy = alloca (len + 1); |
768 | struct symbol *sym; | |
769 | ||
770 | memcpy (name_copy, name, len); | |
771 | name_copy[len] = '\0'; | |
94af9270 | 772 | sym = lookup_block_symbol (block, name_copy, VAR_DOMAIN); |
5c4e30ca DC |
773 | |
774 | if (sym == NULL) | |
775 | { | |
ec5cdd75 | 776 | struct type *type; |
ec5cdd75 DJ |
777 | |
778 | type = init_type (TYPE_CODE_NAMESPACE, 0, 0, name_copy, objfile); | |
779 | ||
5c4e30ca DC |
780 | TYPE_TAG_NAME (type) = TYPE_NAME (type); |
781 | ||
4a146b47 | 782 | sym = obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); |
5c4e30ca DC |
783 | memset (sym, 0, sizeof (struct symbol)); |
784 | SYMBOL_LANGUAGE (sym) = language_cplus; | |
04a679b8 TT |
785 | /* Note that init_type copied the name to the objfile's |
786 | obstack. */ | |
787 | SYMBOL_SET_NAMES (sym, TYPE_NAME (type), len, 0, objfile); | |
5c4e30ca DC |
788 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; |
789 | SYMBOL_TYPE (sym) = type; | |
790 | SYMBOL_DOMAIN (sym) = VAR_DOMAIN; | |
791 | ||
792 | dict_add_symbol (BLOCK_DICT (block), sym); | |
793 | ||
794 | return 0; | |
795 | } | |
796 | else | |
ec5cdd75 | 797 | return 1; |
5c4e30ca DC |
798 | } |
799 | ||
800 | /* Look for a symbol named NAME in all the possible namespace blocks. | |
21b556f4 | 801 | If one is found, return it. */ |
5c4e30ca DC |
802 | |
803 | static struct symbol * | |
21b556f4 | 804 | lookup_possible_namespace_symbol (const char *name) |
5c4e30ca DC |
805 | { |
806 | struct objfile *objfile; | |
807 | ||
808 | ALL_OBJFILES (objfile) | |
809 | { | |
810 | struct symbol *sym; | |
811 | ||
812 | sym = lookup_block_symbol (get_possible_namespace_block (objfile), | |
94af9270 | 813 | name, VAR_DOMAIN); |
5c4e30ca DC |
814 | |
815 | if (sym != NULL) | |
21b556f4 | 816 | return sym; |
5c4e30ca DC |
817 | } |
818 | ||
819 | return NULL; | |
820 | } | |
821 | ||
822 | /* Print out all the possible namespace symbols. */ | |
823 | ||
824 | static void | |
825 | maintenance_cplus_namespace (char *args, int from_tty) | |
826 | { | |
827 | struct objfile *objfile; | |
a3f17187 | 828 | printf_unfiltered (_("Possible namespaces:\n")); |
5c4e30ca DC |
829 | ALL_OBJFILES (objfile) |
830 | { | |
831 | struct dict_iterator iter; | |
832 | struct symbol *sym; | |
833 | ||
834 | ALL_BLOCK_SYMBOLS (get_possible_namespace_block (objfile), iter, sym) | |
835 | { | |
836 | printf_unfiltered ("%s\n", SYMBOL_PRINT_NAME (sym)); | |
837 | } | |
838 | } | |
839 | } | |
840 | ||
2c0b251b PA |
841 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
842 | extern initialize_file_ftype _initialize_cp_namespace; | |
843 | ||
5c4e30ca DC |
844 | void |
845 | _initialize_cp_namespace (void) | |
846 | { | |
847 | add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, | |
1a966eab | 848 | _("Print the list of possible C++ namespaces."), |
5c4e30ca | 849 | &maint_cplus_cmd_list); |
1fcb5155 | 850 | } |