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9219021c | 1 | /* Helper routines for C++ support in GDB. |
6aba47ca | 2 | Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc. |
9219021c | 3 | |
1fcb5155 | 4 | Contributed by David Carlton and by Kealia, Inc. |
9219021c DC |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
9219021c DC |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
9219021c DC |
20 | |
21 | #include "defs.h" | |
22 | #include "cp-support.h" | |
23 | #include "gdb_obstack.h" | |
24 | #include "symtab.h" | |
25 | #include "symfile.h" | |
26 | #include "gdb_assert.h" | |
27 | #include "block.h" | |
5c4e30ca DC |
28 | #include "objfiles.h" |
29 | #include "gdbtypes.h" | |
30 | #include "dictionary.h" | |
31 | #include "command.h" | |
b368761e | 32 | #include "frame.h" |
9219021c | 33 | |
63d06c5c DC |
34 | /* When set, the file that we're processing is known to have debugging |
35 | info for C++ namespaces. */ | |
36 | ||
37 | /* NOTE: carlton/2004-01-13: No currently released version of GCC (the | |
38 | latest of which is 3.3.x at the time of this writing) produces this | |
39 | debug info. GCC 3.4 should, however. */ | |
9219021c DC |
40 | |
41 | unsigned char processing_has_namespace_info; | |
42 | ||
38d518c9 EZ |
43 | /* This contains our best guess as to the name of the current |
44 | enclosing namespace(s)/class(es), if any. For example, if we're | |
45 | within the method foo() in the following code: | |
9219021c | 46 | |
38d518c9 EZ |
47 | namespace N { |
48 | class C { | |
49 | void foo () { | |
50 | } | |
51 | }; | |
52 | } | |
53 | ||
54 | then processing_current_prefix should be set to "N::C". If | |
55 | processing_has_namespace_info is false, then this variable might | |
56 | not be reliable. */ | |
0fc9922a | 57 | |
38d518c9 | 58 | const char *processing_current_prefix; |
9219021c DC |
59 | |
60 | /* List of using directives that are active in the current file. */ | |
61 | ||
62 | static struct using_direct *using_list; | |
63 | ||
64 | static struct using_direct *cp_add_using (const char *name, | |
65 | unsigned int inner_len, | |
66 | unsigned int outer_len, | |
67 | struct using_direct *next); | |
68 | ||
69 | static struct using_direct *cp_copy_usings (struct using_direct *using, | |
70 | struct obstack *obstack); | |
71 | ||
1fcb5155 DC |
72 | static struct symbol *lookup_namespace_scope (const char *name, |
73 | const char *linkage_name, | |
74 | const struct block *block, | |
75 | const domain_enum domain, | |
76 | struct symtab **symtab, | |
77 | const char *scope, | |
78 | int scope_len); | |
79 | ||
80 | static struct symbol *lookup_symbol_file (const char *name, | |
81 | const char *linkage_name, | |
82 | const struct block *block, | |
83 | const domain_enum domain, | |
84 | struct symtab **symtab, | |
85 | int anonymous_namespace); | |
86 | ||
b368761e DC |
87 | static struct type *cp_lookup_transparent_type_loop (const char *name, |
88 | const char *scope, | |
89 | int scope_len); | |
90 | ||
5c4e30ca DC |
91 | static void initialize_namespace_symtab (struct objfile *objfile); |
92 | ||
93 | static struct block *get_possible_namespace_block (struct objfile *objfile); | |
94 | ||
95 | static void free_namespace_block (struct symtab *symtab); | |
96 | ||
97 | static int check_possible_namespace_symbols_loop (const char *name, | |
98 | int len, | |
99 | struct objfile *objfile); | |
100 | ||
101 | static int check_one_possible_namespace_symbol (const char *name, | |
102 | int len, | |
103 | struct objfile *objfile); | |
104 | ||
105 | static | |
106 | struct symbol *lookup_possible_namespace_symbol (const char *name, | |
107 | struct symtab **symtab); | |
108 | ||
109 | static void maintenance_cplus_namespace (char *args, int from_tty); | |
110 | ||
9219021c DC |
111 | /* Set up support for dealing with C++ namespace info in the current |
112 | symtab. */ | |
113 | ||
114 | void cp_initialize_namespace () | |
115 | { | |
116 | processing_has_namespace_info = 0; | |
117 | using_list = NULL; | |
118 | } | |
119 | ||
120 | /* Add all the using directives we've gathered to the current symtab. | |
121 | STATIC_BLOCK should be the symtab's static block; OBSTACK is used | |
122 | for allocation. */ | |
123 | ||
124 | void | |
125 | cp_finalize_namespace (struct block *static_block, | |
126 | struct obstack *obstack) | |
127 | { | |
128 | if (using_list != NULL) | |
129 | { | |
130 | block_set_using (static_block, | |
131 | cp_copy_usings (using_list, obstack), | |
132 | obstack); | |
133 | using_list = NULL; | |
134 | } | |
135 | } | |
136 | ||
137 | /* Check to see if SYMBOL refers to an object contained within an | |
138 | anonymous namespace; if so, add an appropriate using directive. */ | |
139 | ||
140 | /* Optimize away strlen ("(anonymous namespace)"). */ | |
141 | ||
142 | #define ANONYMOUS_NAMESPACE_LEN 21 | |
143 | ||
144 | void | |
145 | cp_scan_for_anonymous_namespaces (const struct symbol *symbol) | |
146 | { | |
147 | if (!processing_has_namespace_info | |
148 | && SYMBOL_CPLUS_DEMANGLED_NAME (symbol) != NULL) | |
149 | { | |
150 | const char *name = SYMBOL_CPLUS_DEMANGLED_NAME (symbol); | |
151 | unsigned int previous_component; | |
152 | unsigned int next_component; | |
153 | const char *len; | |
154 | ||
155 | /* Start with a quick-and-dirty check for mention of "(anonymous | |
156 | namespace)". */ | |
157 | ||
158 | if (!cp_is_anonymous (name)) | |
159 | return; | |
160 | ||
161 | previous_component = 0; | |
162 | next_component = cp_find_first_component (name + previous_component); | |
163 | ||
164 | while (name[next_component] == ':') | |
165 | { | |
166 | if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN | |
167 | && strncmp (name + previous_component, | |
168 | "(anonymous namespace)", | |
169 | ANONYMOUS_NAMESPACE_LEN) == 0) | |
170 | { | |
171 | /* We've found a component of the name that's an | |
172 | anonymous namespace. So add symbols in it to the | |
173 | namespace given by the previous component if there is | |
174 | one, or to the global namespace if there isn't. */ | |
175 | cp_add_using_directive (name, | |
176 | previous_component == 0 | |
177 | ? 0 : previous_component - 2, | |
178 | next_component); | |
179 | } | |
180 | /* The "+ 2" is for the "::". */ | |
181 | previous_component = next_component + 2; | |
182 | next_component = (previous_component | |
183 | + cp_find_first_component (name | |
184 | + previous_component)); | |
185 | } | |
186 | } | |
187 | } | |
188 | ||
189 | /* Add a using directive to using_list. NAME is the start of a string | |
190 | that should contain the namespaces we want to add as initial | |
191 | substrings, OUTER_LENGTH is the end of the outer namespace, and | |
192 | INNER_LENGTH is the end of the inner namespace. If the using | |
193 | directive in question has already been added, don't add it | |
194 | twice. */ | |
195 | ||
196 | void | |
197 | cp_add_using_directive (const char *name, unsigned int outer_length, | |
198 | unsigned int inner_length) | |
199 | { | |
200 | struct using_direct *current; | |
201 | struct using_direct *new; | |
202 | ||
203 | /* Has it already been added? */ | |
204 | ||
205 | for (current = using_list; current != NULL; current = current->next) | |
206 | { | |
207 | if ((strncmp (current->inner, name, inner_length) == 0) | |
208 | && (strlen (current->inner) == inner_length) | |
209 | && (strlen (current->outer) == outer_length)) | |
210 | return; | |
211 | } | |
212 | ||
213 | using_list = cp_add_using (name, inner_length, outer_length, | |
214 | using_list); | |
215 | } | |
216 | ||
217 | /* Record the namespace that the function defined by SYMBOL was | |
218 | defined in, if necessary. BLOCK is the associated block; use | |
219 | OBSTACK for allocation. */ | |
220 | ||
221 | void | |
222 | cp_set_block_scope (const struct symbol *symbol, | |
223 | struct block *block, | |
224 | struct obstack *obstack) | |
225 | { | |
226 | /* Make sure that the name was originally mangled: if not, there | |
227 | certainly isn't any namespace information to worry about! */ | |
228 | ||
229 | if (SYMBOL_CPLUS_DEMANGLED_NAME (symbol) != NULL) | |
230 | { | |
231 | if (processing_has_namespace_info) | |
232 | { | |
233 | block_set_scope | |
38d518c9 EZ |
234 | (block, obsavestring (processing_current_prefix, |
235 | strlen (processing_current_prefix), | |
9219021c DC |
236 | obstack), |
237 | obstack); | |
238 | } | |
239 | else | |
240 | { | |
241 | /* Try to figure out the appropriate namespace from the | |
242 | demangled name. */ | |
243 | ||
244 | /* FIXME: carlton/2003-04-15: If the function in question is | |
245 | a method of a class, the name will actually include the | |
246 | name of the class as well. This should be harmless, but | |
247 | is a little unfortunate. */ | |
248 | ||
249 | const char *name = SYMBOL_CPLUS_DEMANGLED_NAME (symbol); | |
250 | unsigned int prefix_len = cp_entire_prefix_len (name); | |
251 | ||
252 | block_set_scope (block, | |
253 | obsavestring (name, prefix_len, obstack), | |
254 | obstack); | |
255 | } | |
256 | } | |
257 | } | |
258 | ||
259 | /* Test whether or not NAMESPACE looks like it mentions an anonymous | |
260 | namespace; return nonzero if so. */ | |
261 | ||
262 | int | |
263 | cp_is_anonymous (const char *namespace) | |
264 | { | |
265 | return (strstr (namespace, "(anonymous namespace)") | |
266 | != NULL); | |
267 | } | |
268 | ||
269 | /* Create a new struct using direct whose inner namespace is the | |
270 | initial substring of NAME of leng INNER_LEN and whose outer | |
271 | namespace is the initial substring of NAME of length OUTER_LENGTH. | |
272 | Set its next member in the linked list to NEXT; allocate all memory | |
273 | using xmalloc. It copies the strings, so NAME can be a temporary | |
274 | string. */ | |
275 | ||
276 | static struct using_direct * | |
277 | cp_add_using (const char *name, | |
278 | unsigned int inner_len, | |
279 | unsigned int outer_len, | |
280 | struct using_direct *next) | |
281 | { | |
282 | struct using_direct *retval; | |
283 | ||
284 | gdb_assert (outer_len < inner_len); | |
285 | ||
286 | retval = xmalloc (sizeof (struct using_direct)); | |
287 | retval->inner = savestring (name, inner_len); | |
288 | retval->outer = savestring (name, outer_len); | |
289 | retval->next = next; | |
290 | ||
291 | return retval; | |
292 | } | |
293 | ||
294 | /* Make a copy of the using directives in the list pointed to by | |
295 | USING, using OBSTACK to allocate memory. Free all memory pointed | |
296 | to by USING via xfree. */ | |
297 | ||
298 | static struct using_direct * | |
299 | cp_copy_usings (struct using_direct *using, | |
300 | struct obstack *obstack) | |
301 | { | |
302 | if (using == NULL) | |
303 | { | |
304 | return NULL; | |
305 | } | |
306 | else | |
307 | { | |
308 | struct using_direct *retval | |
309 | = obstack_alloc (obstack, sizeof (struct using_direct)); | |
310 | retval->inner = obsavestring (using->inner, strlen (using->inner), | |
311 | obstack); | |
312 | retval->outer = obsavestring (using->outer, strlen (using->outer), | |
313 | obstack); | |
314 | retval->next = cp_copy_usings (using->next, obstack); | |
315 | ||
316 | xfree (using->inner); | |
317 | xfree (using->outer); | |
318 | xfree (using); | |
319 | ||
320 | return retval; | |
321 | } | |
322 | } | |
1fcb5155 DC |
323 | |
324 | /* The C++-specific version of name lookup for static and global | |
325 | names. This makes sure that names get looked for in all namespaces | |
326 | that are in scope. NAME is the natural name of the symbol that | |
327 | we're looking for, LINKAGE_NAME (which is optional) is its linkage | |
328 | name, BLOCK is the block that we're searching within, DOMAIN says | |
329 | what kind of symbols we're looking for, and if SYMTAB is non-NULL, | |
330 | we should store the symtab where we found the symbol in it. */ | |
331 | ||
332 | struct symbol * | |
333 | cp_lookup_symbol_nonlocal (const char *name, | |
334 | const char *linkage_name, | |
335 | const struct block *block, | |
336 | const domain_enum domain, | |
337 | struct symtab **symtab) | |
338 | { | |
339 | return lookup_namespace_scope (name, linkage_name, block, domain, | |
340 | symtab, block_scope (block), 0); | |
341 | } | |
342 | ||
343 | /* Lookup NAME at namespace scope (or, in C terms, in static and | |
344 | global variables). SCOPE is the namespace that the current | |
345 | function is defined within; only consider namespaces whose length | |
346 | is at least SCOPE_LEN. Other arguments are as in | |
347 | cp_lookup_symbol_nonlocal. | |
348 | ||
349 | For example, if we're within a function A::B::f and looking for a | |
3882f37a | 350 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
1fcb5155 DC |
351 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
352 | but with SCOPE_LEN = 1. And then it calls itself with NAME and | |
353 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for | |
354 | "A::B::x"; if it doesn't find it, then the second call looks for | |
355 | "A::x", and if that call fails, then the first call looks for | |
356 | "x". */ | |
357 | ||
358 | static struct symbol * | |
359 | lookup_namespace_scope (const char *name, | |
360 | const char *linkage_name, | |
361 | const struct block *block, | |
362 | const domain_enum domain, | |
363 | struct symtab **symtab, | |
364 | const char *scope, | |
365 | int scope_len) | |
366 | { | |
367 | char *namespace; | |
368 | ||
369 | if (scope[scope_len] != '\0') | |
370 | { | |
371 | /* Recursively search for names in child namespaces first. */ | |
372 | ||
373 | struct symbol *sym; | |
374 | int new_scope_len = scope_len; | |
375 | ||
376 | /* If the current scope is followed by "::", skip past that. */ | |
377 | if (new_scope_len != 0) | |
378 | { | |
379 | gdb_assert (scope[new_scope_len] == ':'); | |
380 | new_scope_len += 2; | |
381 | } | |
382 | new_scope_len += cp_find_first_component (scope + new_scope_len); | |
383 | sym = lookup_namespace_scope (name, linkage_name, block, | |
384 | domain, symtab, | |
385 | scope, new_scope_len); | |
386 | if (sym != NULL) | |
387 | return sym; | |
388 | } | |
389 | ||
390 | /* Okay, we didn't find a match in our children, so look for the | |
391 | name in the current namespace. */ | |
392 | ||
393 | namespace = alloca (scope_len + 1); | |
394 | strncpy (namespace, scope, scope_len); | |
395 | namespace[scope_len] = '\0'; | |
396 | return cp_lookup_symbol_namespace (namespace, name, linkage_name, | |
397 | block, domain, symtab); | |
398 | } | |
399 | ||
400 | /* Look up NAME in the C++ namespace NAMESPACE, applying the using | |
401 | directives that are active in BLOCK. Other arguments are as in | |
402 | cp_lookup_symbol_nonlocal. */ | |
403 | ||
404 | struct symbol * | |
405 | cp_lookup_symbol_namespace (const char *namespace, | |
406 | const char *name, | |
407 | const char *linkage_name, | |
408 | const struct block *block, | |
409 | const domain_enum domain, | |
410 | struct symtab **symtab) | |
411 | { | |
412 | const struct using_direct *current; | |
413 | struct symbol *sym; | |
414 | ||
415 | /* First, go through the using directives. If any of them add new | |
416 | names to the namespace we're searching in, see if we can find a | |
417 | match by applying them. */ | |
418 | ||
419 | for (current = block_using (block); | |
420 | current != NULL; | |
421 | current = current->next) | |
422 | { | |
423 | if (strcmp (namespace, current->outer) == 0) | |
424 | { | |
425 | sym = cp_lookup_symbol_namespace (current->inner, | |
426 | name, | |
427 | linkage_name, | |
428 | block, | |
429 | domain, | |
430 | symtab); | |
431 | if (sym != NULL) | |
432 | return sym; | |
433 | } | |
434 | } | |
435 | ||
436 | /* We didn't find anything by applying any of the using directives | |
437 | that are still applicable; so let's see if we've got a match | |
438 | using the current namespace. */ | |
439 | ||
440 | if (namespace[0] == '\0') | |
441 | { | |
442 | return lookup_symbol_file (name, linkage_name, block, | |
443 | domain, symtab, 0); | |
444 | } | |
445 | else | |
446 | { | |
447 | char *concatenated_name | |
448 | = alloca (strlen (namespace) + 2 + strlen (name) + 1); | |
449 | strcpy (concatenated_name, namespace); | |
450 | strcat (concatenated_name, "::"); | |
451 | strcat (concatenated_name, name); | |
452 | sym = lookup_symbol_file (concatenated_name, linkage_name, | |
453 | block, domain, symtab, | |
454 | cp_is_anonymous (namespace)); | |
455 | return sym; | |
456 | } | |
457 | } | |
458 | ||
459 | /* Look up NAME in BLOCK's static block and in global blocks. If | |
460 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located | |
461 | within an anonymous namespace. Other arguments are as in | |
462 | cp_lookup_symbol_nonlocal. */ | |
463 | ||
464 | static struct symbol * | |
465 | lookup_symbol_file (const char *name, | |
466 | const char *linkage_name, | |
467 | const struct block *block, | |
468 | const domain_enum domain, | |
469 | struct symtab **symtab, | |
470 | int anonymous_namespace) | |
471 | { | |
472 | struct symbol *sym = NULL; | |
473 | ||
474 | sym = lookup_symbol_static (name, linkage_name, block, domain, symtab); | |
475 | if (sym != NULL) | |
476 | return sym; | |
477 | ||
478 | if (anonymous_namespace) | |
479 | { | |
480 | /* Symbols defined in anonymous namespaces have external linkage | |
481 | but should be treated as local to a single file nonetheless. | |
482 | So we only search the current file's global block. */ | |
483 | ||
484 | const struct block *global_block = block_global_block (block); | |
485 | ||
486 | if (global_block != NULL) | |
5c4e30ca DC |
487 | sym = lookup_symbol_aux_block (name, linkage_name, global_block, |
488 | domain, symtab); | |
1fcb5155 DC |
489 | } |
490 | else | |
491 | { | |
3a40aaa0 | 492 | sym = lookup_symbol_global (name, linkage_name, block, domain, symtab); |
5c4e30ca DC |
493 | } |
494 | ||
495 | if (sym != NULL) | |
496 | return sym; | |
497 | ||
498 | /* Now call "lookup_possible_namespace_symbol". Symbols in here | |
499 | claim to be associated to namespaces, but this claim might be | |
500 | incorrect: the names in question might actually correspond to | |
501 | classes instead of namespaces. But if they correspond to | |
502 | classes, then we should have found a match for them above. So if | |
503 | we find them now, they should be genuine. */ | |
504 | ||
505 | /* FIXME: carlton/2003-06-12: This is a hack and should eventually | |
506 | be deleted: see comments below. */ | |
507 | ||
508 | if (domain == VAR_DOMAIN) | |
509 | { | |
510 | sym = lookup_possible_namespace_symbol (name, symtab); | |
511 | if (sym != NULL) | |
512 | return sym; | |
513 | } | |
514 | ||
515 | return NULL; | |
516 | } | |
517 | ||
79c2c32d DC |
518 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
519 | class or namespace given by PARENT_TYPE, from within the context | |
520 | given by BLOCK. Return NULL if there is no such nested type. */ | |
521 | ||
79c2c32d DC |
522 | struct type * |
523 | cp_lookup_nested_type (struct type *parent_type, | |
524 | const char *nested_name, | |
525 | const struct block *block) | |
526 | { | |
527 | switch (TYPE_CODE (parent_type)) | |
528 | { | |
63d06c5c | 529 | case TYPE_CODE_STRUCT: |
79c2c32d DC |
530 | case TYPE_CODE_NAMESPACE: |
531 | { | |
63d06c5c DC |
532 | /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
533 | of classes like, say, data or function members. Instead, | |
534 | they're just represented by symbols whose names are | |
535 | qualified by the name of the surrounding class. This is | |
536 | just like members of namespaces; in particular, | |
537 | lookup_symbol_namespace works when looking them up. */ | |
538 | ||
79c2c32d DC |
539 | const char *parent_name = TYPE_TAG_NAME (parent_type); |
540 | struct symbol *sym = cp_lookup_symbol_namespace (parent_name, | |
541 | nested_name, | |
542 | NULL, | |
543 | block, | |
544 | VAR_DOMAIN, | |
545 | NULL); | |
546 | if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF) | |
547 | return NULL; | |
548 | else | |
549 | return SYMBOL_TYPE (sym); | |
550 | } | |
551 | default: | |
552 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 553 | _("cp_lookup_nested_type called on a non-aggregate type.")); |
79c2c32d DC |
554 | } |
555 | } | |
556 | ||
b368761e DC |
557 | /* The C++-version of lookup_transparent_type. */ |
558 | ||
559 | /* FIXME: carlton/2004-01-16: The problem that this is trying to | |
560 | address is that, unfortunately, sometimes NAME is wrong: it may not | |
561 | include the name of namespaces enclosing the type in question. | |
562 | lookup_transparent_type gets called when the the type in question | |
563 | is a declaration, and we're trying to find its definition; but, for | |
564 | declarations, our type name deduction mechanism doesn't work. | |
565 | There's nothing we can do to fix this in general, I think, in the | |
566 | absence of debug information about namespaces (I've filed PR | |
567 | gdb/1511 about this); until such debug information becomes more | |
568 | prevalent, one heuristic which sometimes looks is to search for the | |
569 | definition in namespaces containing the current namespace. | |
570 | ||
571 | We should delete this functions once the appropriate debug | |
572 | information becomes more widespread. (GCC 3.4 will be the first | |
573 | released version of GCC with such information.) */ | |
574 | ||
575 | struct type * | |
576 | cp_lookup_transparent_type (const char *name) | |
577 | { | |
578 | /* First, try the honest way of looking up the definition. */ | |
579 | struct type *t = basic_lookup_transparent_type (name); | |
580 | const char *scope; | |
581 | ||
582 | if (t != NULL) | |
583 | return t; | |
584 | ||
585 | /* If that doesn't work and we're within a namespace, look there | |
586 | instead. */ | |
587 | scope = block_scope (get_selected_block (0)); | |
588 | ||
589 | if (scope[0] == '\0') | |
590 | return NULL; | |
591 | ||
592 | return cp_lookup_transparent_type_loop (name, scope, 0); | |
593 | } | |
594 | ||
595 | /* Lookup the the type definition associated to NAME in | |
596 | namespaces/classes containing SCOPE whose name is strictly longer | |
597 | than LENGTH. LENGTH must be the index of the start of a | |
598 | component of SCOPE. */ | |
599 | ||
600 | static struct type * | |
601 | cp_lookup_transparent_type_loop (const char *name, const char *scope, | |
602 | int length) | |
603 | { | |
1198ecbe | 604 | int scope_length = length + cp_find_first_component (scope + length); |
b368761e DC |
605 | char *full_name; |
606 | ||
607 | /* If the current scope is followed by "::", look in the next | |
608 | component. */ | |
609 | if (scope[scope_length] == ':') | |
610 | { | |
611 | struct type *retval | |
612 | = cp_lookup_transparent_type_loop (name, scope, scope_length + 2); | |
613 | if (retval != NULL) | |
614 | return retval; | |
615 | } | |
616 | ||
617 | full_name = alloca (scope_length + 2 + strlen (name) + 1); | |
618 | strncpy (full_name, scope, scope_length); | |
619 | strncpy (full_name + scope_length, "::", 2); | |
620 | strcpy (full_name + scope_length + 2, name); | |
621 | ||
622 | return basic_lookup_transparent_type (full_name); | |
623 | } | |
624 | ||
5c4e30ca DC |
625 | /* Now come functions for dealing with symbols associated to |
626 | namespaces. (They're used to store the namespaces themselves, not | |
627 | objects that live in the namespaces.) These symbols come in two | |
628 | varieties: if we run into a DW_TAG_namespace DIE, then we know that | |
629 | we have a namespace, so dwarf2read.c creates a symbol for it just | |
630 | like normal. But, unfortunately, versions of GCC through at least | |
631 | 3.3 don't generate those DIE's. Our solution is to try to guess | |
632 | their existence by looking at demangled names. This might cause us | |
633 | to misidentify classes as namespaces, however. So we put those | |
634 | symbols in a special block (one per objfile), and we only search | |
635 | that block as a last resort. */ | |
636 | ||
637 | /* FIXME: carlton/2003-06-12: Once versions of GCC that generate | |
638 | DW_TAG_namespace have been out for a year or two, we should get rid | |
639 | of all of this "possible namespace" nonsense. */ | |
640 | ||
641 | /* Allocate everything necessary for the possible namespace block | |
642 | associated to OBJFILE. */ | |
643 | ||
644 | static void | |
645 | initialize_namespace_symtab (struct objfile *objfile) | |
646 | { | |
647 | struct symtab *namespace_symtab; | |
648 | struct blockvector *bv; | |
649 | struct block *bl; | |
650 | ||
651 | namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); | |
652 | namespace_symtab->language = language_cplus; | |
653 | namespace_symtab->free_code = free_nothing; | |
654 | namespace_symtab->dirname = NULL; | |
655 | ||
4a146b47 | 656 | bv = obstack_alloc (&objfile->objfile_obstack, |
5c4e30ca DC |
657 | sizeof (struct blockvector) |
658 | + FIRST_LOCAL_BLOCK * sizeof (struct block *)); | |
659 | BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; | |
660 | BLOCKVECTOR (namespace_symtab) = bv; | |
661 | ||
662 | /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ | |
663 | ||
4a146b47 EZ |
664 | bl = allocate_block (&objfile->objfile_obstack); |
665 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
666 | NULL); |
667 | BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; | |
4a146b47 EZ |
668 | bl = allocate_block (&objfile->objfile_obstack); |
669 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
670 | NULL); |
671 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; | |
672 | ||
673 | /* Allocate the possible namespace block; we put it where the first | |
674 | local block will live, though I don't think there's any need to | |
675 | pretend that it's actually a local block (e.g. by setting | |
676 | BLOCK_SUPERBLOCK appropriately). We don't use the global or | |
677 | static block because we don't want it searched during the normal | |
678 | search of all global/static blocks in lookup_symbol: we only want | |
679 | it used as a last resort. */ | |
680 | ||
681 | /* NOTE: carlton/2003-09-11: I considered not associating the fake | |
682 | symbols to a block/symtab at all. But that would cause problems | |
683 | with lookup_symbol's SYMTAB argument and with block_found, so | |
684 | having a symtab/block for this purpose seems like the best | |
685 | solution for now. */ | |
686 | ||
4a146b47 | 687 | bl = allocate_block (&objfile->objfile_obstack); |
5c4e30ca DC |
688 | BLOCK_DICT (bl) = dict_create_hashed_expandable (); |
689 | BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; | |
690 | ||
691 | namespace_symtab->free_func = free_namespace_block; | |
692 | ||
693 | objfile->cp_namespace_symtab = namespace_symtab; | |
694 | } | |
695 | ||
696 | /* Locate the possible namespace block associated to OBJFILE, | |
697 | allocating it if necessary. */ | |
698 | ||
699 | static struct block * | |
700 | get_possible_namespace_block (struct objfile *objfile) | |
701 | { | |
702 | if (objfile->cp_namespace_symtab == NULL) | |
703 | initialize_namespace_symtab (objfile); | |
704 | ||
705 | return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), | |
706 | FIRST_LOCAL_BLOCK); | |
707 | } | |
708 | ||
709 | /* Free the dictionary associated to the possible namespace block. */ | |
710 | ||
711 | static void | |
712 | free_namespace_block (struct symtab *symtab) | |
713 | { | |
714 | struct block *possible_namespace_block; | |
715 | ||
716 | possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), | |
717 | FIRST_LOCAL_BLOCK); | |
718 | gdb_assert (possible_namespace_block != NULL); | |
719 | dict_free (BLOCK_DICT (possible_namespace_block)); | |
720 | } | |
721 | ||
722 | /* Ensure that there are symbols in the possible namespace block | |
723 | associated to OBJFILE for all initial substrings of NAME that look | |
724 | like namespaces or classes. NAME should end in a member variable: | |
725 | it shouldn't consist solely of namespaces. */ | |
726 | ||
727 | void | |
728 | cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) | |
729 | { | |
730 | check_possible_namespace_symbols_loop (name, | |
731 | cp_find_first_component (name), | |
732 | objfile); | |
733 | } | |
734 | ||
735 | /* This is a helper loop for cp_check_possible_namespace_symbols; it | |
736 | ensures that there are symbols in the possible namespace block | |
737 | associated to OBJFILE for all namespaces that are initial | |
738 | substrings of NAME of length at least LEN. It returns 1 if a | |
739 | previous loop had already created the shortest such symbol and 0 | |
740 | otherwise. | |
741 | ||
742 | This function assumes that if there is already a symbol associated | |
743 | to a substring of NAME of a given length, then there are already | |
744 | symbols associated to all substrings of NAME whose length is less | |
745 | than that length. So if cp_check_possible_namespace_symbols has | |
746 | been called once with argument "A::B::C::member", then that will | |
747 | create symbols "A", "A::B", and "A::B::C". If it is then later | |
748 | called with argument "A::B::D::member", then the new call will | |
749 | generate a new symbol for "A::B::D", but once it sees that "A::B" | |
750 | has already been created, it doesn't bother checking to see if "A" | |
751 | has also been created. */ | |
752 | ||
753 | static int | |
754 | check_possible_namespace_symbols_loop (const char *name, int len, | |
755 | struct objfile *objfile) | |
756 | { | |
757 | if (name[len] == ':') | |
758 | { | |
759 | int done; | |
760 | int next_len = len + 2; | |
761 | ||
762 | next_len += cp_find_first_component (name + next_len); | |
763 | done = check_possible_namespace_symbols_loop (name, next_len, | |
764 | objfile); | |
765 | ||
766 | if (!done) | |
767 | done = check_one_possible_namespace_symbol (name, len, objfile); | |
768 | ||
769 | return done; | |
1fcb5155 | 770 | } |
5c4e30ca DC |
771 | else |
772 | return 0; | |
773 | } | |
774 | ||
775 | /* Check to see if there's already a possible namespace symbol in | |
776 | OBJFILE whose name is the initial substring of NAME of length LEN. | |
777 | If not, create one and return 0; otherwise, return 1. */ | |
778 | ||
779 | static int | |
780 | check_one_possible_namespace_symbol (const char *name, int len, | |
781 | struct objfile *objfile) | |
782 | { | |
783 | struct block *block = get_possible_namespace_block (objfile); | |
ec5cdd75 DJ |
784 | char *name_copy = alloca (len + 1); |
785 | struct symbol *sym; | |
786 | ||
787 | memcpy (name_copy, name, len); | |
788 | name_copy[len] = '\0'; | |
789 | sym = lookup_block_symbol (block, name_copy, NULL, VAR_DOMAIN); | |
5c4e30ca DC |
790 | |
791 | if (sym == NULL) | |
792 | { | |
ec5cdd75 DJ |
793 | struct type *type; |
794 | name_copy = obsavestring (name, len, &objfile->objfile_obstack); | |
795 | ||
796 | type = init_type (TYPE_CODE_NAMESPACE, 0, 0, name_copy, objfile); | |
797 | ||
5c4e30ca DC |
798 | TYPE_TAG_NAME (type) = TYPE_NAME (type); |
799 | ||
4a146b47 | 800 | sym = obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); |
5c4e30ca DC |
801 | memset (sym, 0, sizeof (struct symbol)); |
802 | SYMBOL_LANGUAGE (sym) = language_cplus; | |
803 | SYMBOL_SET_NAMES (sym, name_copy, len, objfile); | |
804 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; | |
805 | SYMBOL_TYPE (sym) = type; | |
806 | SYMBOL_DOMAIN (sym) = VAR_DOMAIN; | |
807 | ||
808 | dict_add_symbol (BLOCK_DICT (block), sym); | |
809 | ||
810 | return 0; | |
811 | } | |
812 | else | |
ec5cdd75 | 813 | return 1; |
5c4e30ca DC |
814 | } |
815 | ||
816 | /* Look for a symbol named NAME in all the possible namespace blocks. | |
817 | If one is found, return it; if SYMTAB is non-NULL, set *SYMTAB to | |
818 | equal the symtab where it was found. */ | |
819 | ||
820 | static struct symbol * | |
821 | lookup_possible_namespace_symbol (const char *name, struct symtab **symtab) | |
822 | { | |
823 | struct objfile *objfile; | |
824 | ||
825 | ALL_OBJFILES (objfile) | |
826 | { | |
827 | struct symbol *sym; | |
828 | ||
829 | sym = lookup_block_symbol (get_possible_namespace_block (objfile), | |
830 | name, NULL, VAR_DOMAIN); | |
831 | ||
832 | if (sym != NULL) | |
833 | { | |
834 | if (symtab != NULL) | |
835 | *symtab = objfile->cp_namespace_symtab; | |
836 | ||
837 | return sym; | |
838 | } | |
839 | } | |
840 | ||
841 | return NULL; | |
842 | } | |
843 | ||
844 | /* Print out all the possible namespace symbols. */ | |
845 | ||
846 | static void | |
847 | maintenance_cplus_namespace (char *args, int from_tty) | |
848 | { | |
849 | struct objfile *objfile; | |
a3f17187 | 850 | printf_unfiltered (_("Possible namespaces:\n")); |
5c4e30ca DC |
851 | ALL_OBJFILES (objfile) |
852 | { | |
853 | struct dict_iterator iter; | |
854 | struct symbol *sym; | |
855 | ||
856 | ALL_BLOCK_SYMBOLS (get_possible_namespace_block (objfile), iter, sym) | |
857 | { | |
858 | printf_unfiltered ("%s\n", SYMBOL_PRINT_NAME (sym)); | |
859 | } | |
860 | } | |
861 | } | |
862 | ||
863 | void | |
864 | _initialize_cp_namespace (void) | |
865 | { | |
866 | add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, | |
1a966eab | 867 | _("Print the list of possible C++ namespaces."), |
5c4e30ca | 868 | &maint_cplus_cmd_list); |
1fcb5155 | 869 | } |