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9219021c DC |
1 | /* Helper routines for C++ support in GDB. |
2 | Copyright 2003 Free Software Foundation, Inc. | |
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 | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "cp-support.h" | |
25 | #include "gdb_obstack.h" | |
26 | #include "symtab.h" | |
27 | #include "symfile.h" | |
28 | #include "gdb_assert.h" | |
29 | #include "block.h" | |
5c4e30ca DC |
30 | #include "objfiles.h" |
31 | #include "gdbtypes.h" | |
32 | #include "dictionary.h" | |
33 | #include "command.h" | |
9219021c DC |
34 | |
35 | /* When set, the file that we're processing seems to have debugging | |
36 | info for C++ namespaces, so cp-namespace.c shouldn't try to guess | |
37 | namespace info itself. */ | |
38 | ||
39 | unsigned char processing_has_namespace_info; | |
40 | ||
41 | /* If processing_has_namespace_info is nonzero, this string should | |
42 | contain the name of the current namespace. The string is | |
43 | temporary; copy it if you need it. */ | |
44 | ||
0fc9922a DC |
45 | /* FIXME: carlton/2003-06-12: This isn't entirely reliable: currently, |
46 | we get mislead by DW_AT_specification. */ | |
47 | ||
9219021c DC |
48 | const char *processing_current_namespace; |
49 | ||
50 | /* List of using directives that are active in the current file. */ | |
51 | ||
52 | static struct using_direct *using_list; | |
53 | ||
54 | static struct using_direct *cp_add_using (const char *name, | |
55 | unsigned int inner_len, | |
56 | unsigned int outer_len, | |
57 | struct using_direct *next); | |
58 | ||
59 | static struct using_direct *cp_copy_usings (struct using_direct *using, | |
60 | struct obstack *obstack); | |
61 | ||
1fcb5155 DC |
62 | static struct symbol *lookup_namespace_scope (const char *name, |
63 | const char *linkage_name, | |
64 | const struct block *block, | |
65 | const domain_enum domain, | |
66 | struct symtab **symtab, | |
67 | const char *scope, | |
68 | int scope_len); | |
69 | ||
70 | static struct symbol *lookup_symbol_file (const char *name, | |
71 | const char *linkage_name, | |
72 | const struct block *block, | |
73 | const domain_enum domain, | |
74 | struct symtab **symtab, | |
75 | int anonymous_namespace); | |
76 | ||
5c4e30ca DC |
77 | static void initialize_namespace_symtab (struct objfile *objfile); |
78 | ||
79 | static struct block *get_possible_namespace_block (struct objfile *objfile); | |
80 | ||
81 | static void free_namespace_block (struct symtab *symtab); | |
82 | ||
83 | static int check_possible_namespace_symbols_loop (const char *name, | |
84 | int len, | |
85 | struct objfile *objfile); | |
86 | ||
87 | static int check_one_possible_namespace_symbol (const char *name, | |
88 | int len, | |
89 | struct objfile *objfile); | |
90 | ||
91 | static | |
92 | struct symbol *lookup_possible_namespace_symbol (const char *name, | |
93 | struct symtab **symtab); | |
94 | ||
95 | static void maintenance_cplus_namespace (char *args, int from_tty); | |
96 | ||
9219021c DC |
97 | /* Set up support for dealing with C++ namespace info in the current |
98 | symtab. */ | |
99 | ||
100 | void cp_initialize_namespace () | |
101 | { | |
102 | processing_has_namespace_info = 0; | |
103 | using_list = NULL; | |
104 | } | |
105 | ||
106 | /* Add all the using directives we've gathered to the current symtab. | |
107 | STATIC_BLOCK should be the symtab's static block; OBSTACK is used | |
108 | for allocation. */ | |
109 | ||
110 | void | |
111 | cp_finalize_namespace (struct block *static_block, | |
112 | struct obstack *obstack) | |
113 | { | |
114 | if (using_list != NULL) | |
115 | { | |
116 | block_set_using (static_block, | |
117 | cp_copy_usings (using_list, obstack), | |
118 | obstack); | |
119 | using_list = NULL; | |
120 | } | |
121 | } | |
122 | ||
123 | /* Check to see if SYMBOL refers to an object contained within an | |
124 | anonymous namespace; if so, add an appropriate using directive. */ | |
125 | ||
126 | /* Optimize away strlen ("(anonymous namespace)"). */ | |
127 | ||
128 | #define ANONYMOUS_NAMESPACE_LEN 21 | |
129 | ||
130 | void | |
131 | cp_scan_for_anonymous_namespaces (const struct symbol *symbol) | |
132 | { | |
133 | if (!processing_has_namespace_info | |
134 | && SYMBOL_CPLUS_DEMANGLED_NAME (symbol) != NULL) | |
135 | { | |
136 | const char *name = SYMBOL_CPLUS_DEMANGLED_NAME (symbol); | |
137 | unsigned int previous_component; | |
138 | unsigned int next_component; | |
139 | const char *len; | |
140 | ||
141 | /* Start with a quick-and-dirty check for mention of "(anonymous | |
142 | namespace)". */ | |
143 | ||
144 | if (!cp_is_anonymous (name)) | |
145 | return; | |
146 | ||
147 | previous_component = 0; | |
148 | next_component = cp_find_first_component (name + previous_component); | |
149 | ||
150 | while (name[next_component] == ':') | |
151 | { | |
152 | if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN | |
153 | && strncmp (name + previous_component, | |
154 | "(anonymous namespace)", | |
155 | ANONYMOUS_NAMESPACE_LEN) == 0) | |
156 | { | |
157 | /* We've found a component of the name that's an | |
158 | anonymous namespace. So add symbols in it to the | |
159 | namespace given by the previous component if there is | |
160 | one, or to the global namespace if there isn't. */ | |
161 | cp_add_using_directive (name, | |
162 | previous_component == 0 | |
163 | ? 0 : previous_component - 2, | |
164 | next_component); | |
165 | } | |
166 | /* The "+ 2" is for the "::". */ | |
167 | previous_component = next_component + 2; | |
168 | next_component = (previous_component | |
169 | + cp_find_first_component (name | |
170 | + previous_component)); | |
171 | } | |
172 | } | |
173 | } | |
174 | ||
175 | /* Add a using directive to using_list. NAME is the start of a string | |
176 | that should contain the namespaces we want to add as initial | |
177 | substrings, OUTER_LENGTH is the end of the outer namespace, and | |
178 | INNER_LENGTH is the end of the inner namespace. If the using | |
179 | directive in question has already been added, don't add it | |
180 | twice. */ | |
181 | ||
182 | void | |
183 | cp_add_using_directive (const char *name, unsigned int outer_length, | |
184 | unsigned int inner_length) | |
185 | { | |
186 | struct using_direct *current; | |
187 | struct using_direct *new; | |
188 | ||
189 | /* Has it already been added? */ | |
190 | ||
191 | for (current = using_list; current != NULL; current = current->next) | |
192 | { | |
193 | if ((strncmp (current->inner, name, inner_length) == 0) | |
194 | && (strlen (current->inner) == inner_length) | |
195 | && (strlen (current->outer) == outer_length)) | |
196 | return; | |
197 | } | |
198 | ||
199 | using_list = cp_add_using (name, inner_length, outer_length, | |
200 | using_list); | |
201 | } | |
202 | ||
203 | /* Record the namespace that the function defined by SYMBOL was | |
204 | defined in, if necessary. BLOCK is the associated block; use | |
205 | OBSTACK for allocation. */ | |
206 | ||
207 | void | |
208 | cp_set_block_scope (const struct symbol *symbol, | |
209 | struct block *block, | |
210 | struct obstack *obstack) | |
211 | { | |
212 | /* Make sure that the name was originally mangled: if not, there | |
213 | certainly isn't any namespace information to worry about! */ | |
214 | ||
215 | if (SYMBOL_CPLUS_DEMANGLED_NAME (symbol) != NULL) | |
216 | { | |
0fc9922a DC |
217 | #if 0 |
218 | /* FIXME: carlton/2003-06-12: As mentioned above, | |
219 | 'processing_has_namespace_info' currently isn't entirely | |
220 | reliable, so let's always use demangled names to get this | |
221 | information for now. */ | |
222 | ||
9219021c DC |
223 | if (processing_has_namespace_info) |
224 | { | |
225 | block_set_scope | |
226 | (block, obsavestring (processing_current_namespace, | |
227 | strlen (processing_current_namespace), | |
228 | obstack), | |
229 | obstack); | |
230 | } | |
231 | else | |
0fc9922a | 232 | #endif |
9219021c DC |
233 | { |
234 | /* Try to figure out the appropriate namespace from the | |
235 | demangled name. */ | |
236 | ||
237 | /* FIXME: carlton/2003-04-15: If the function in question is | |
238 | a method of a class, the name will actually include the | |
239 | name of the class as well. This should be harmless, but | |
240 | is a little unfortunate. */ | |
241 | ||
242 | const char *name = SYMBOL_CPLUS_DEMANGLED_NAME (symbol); | |
243 | unsigned int prefix_len = cp_entire_prefix_len (name); | |
244 | ||
245 | block_set_scope (block, | |
246 | obsavestring (name, prefix_len, obstack), | |
247 | obstack); | |
248 | } | |
249 | } | |
250 | } | |
251 | ||
252 | /* Test whether or not NAMESPACE looks like it mentions an anonymous | |
253 | namespace; return nonzero if so. */ | |
254 | ||
255 | int | |
256 | cp_is_anonymous (const char *namespace) | |
257 | { | |
258 | return (strstr (namespace, "(anonymous namespace)") | |
259 | != NULL); | |
260 | } | |
261 | ||
262 | /* Create a new struct using direct whose inner namespace is the | |
263 | initial substring of NAME of leng INNER_LEN and whose outer | |
264 | namespace is the initial substring of NAME of length OUTER_LENGTH. | |
265 | Set its next member in the linked list to NEXT; allocate all memory | |
266 | using xmalloc. It copies the strings, so NAME can be a temporary | |
267 | string. */ | |
268 | ||
269 | static struct using_direct * | |
270 | cp_add_using (const char *name, | |
271 | unsigned int inner_len, | |
272 | unsigned int outer_len, | |
273 | struct using_direct *next) | |
274 | { | |
275 | struct using_direct *retval; | |
276 | ||
277 | gdb_assert (outer_len < inner_len); | |
278 | ||
279 | retval = xmalloc (sizeof (struct using_direct)); | |
280 | retval->inner = savestring (name, inner_len); | |
281 | retval->outer = savestring (name, outer_len); | |
282 | retval->next = next; | |
283 | ||
284 | return retval; | |
285 | } | |
286 | ||
287 | /* Make a copy of the using directives in the list pointed to by | |
288 | USING, using OBSTACK to allocate memory. Free all memory pointed | |
289 | to by USING via xfree. */ | |
290 | ||
291 | static struct using_direct * | |
292 | cp_copy_usings (struct using_direct *using, | |
293 | struct obstack *obstack) | |
294 | { | |
295 | if (using == NULL) | |
296 | { | |
297 | return NULL; | |
298 | } | |
299 | else | |
300 | { | |
301 | struct using_direct *retval | |
302 | = obstack_alloc (obstack, sizeof (struct using_direct)); | |
303 | retval->inner = obsavestring (using->inner, strlen (using->inner), | |
304 | obstack); | |
305 | retval->outer = obsavestring (using->outer, strlen (using->outer), | |
306 | obstack); | |
307 | retval->next = cp_copy_usings (using->next, obstack); | |
308 | ||
309 | xfree (using->inner); | |
310 | xfree (using->outer); | |
311 | xfree (using); | |
312 | ||
313 | return retval; | |
314 | } | |
315 | } | |
1fcb5155 DC |
316 | |
317 | /* The C++-specific version of name lookup for static and global | |
318 | names. This makes sure that names get looked for in all namespaces | |
319 | that are in scope. NAME is the natural name of the symbol that | |
320 | we're looking for, LINKAGE_NAME (which is optional) is its linkage | |
321 | name, BLOCK is the block that we're searching within, DOMAIN says | |
322 | what kind of symbols we're looking for, and if SYMTAB is non-NULL, | |
323 | we should store the symtab where we found the symbol in it. */ | |
324 | ||
325 | struct symbol * | |
326 | cp_lookup_symbol_nonlocal (const char *name, | |
327 | const char *linkage_name, | |
328 | const struct block *block, | |
329 | const domain_enum domain, | |
330 | struct symtab **symtab) | |
331 | { | |
332 | return lookup_namespace_scope (name, linkage_name, block, domain, | |
333 | symtab, block_scope (block), 0); | |
334 | } | |
335 | ||
336 | /* Lookup NAME at namespace scope (or, in C terms, in static and | |
337 | global variables). SCOPE is the namespace that the current | |
338 | function is defined within; only consider namespaces whose length | |
339 | is at least SCOPE_LEN. Other arguments are as in | |
340 | cp_lookup_symbol_nonlocal. | |
341 | ||
342 | For example, if we're within a function A::B::f and looking for a | |
3882f37a | 343 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
1fcb5155 DC |
344 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
345 | but with SCOPE_LEN = 1. And then it calls itself with NAME and | |
346 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for | |
347 | "A::B::x"; if it doesn't find it, then the second call looks for | |
348 | "A::x", and if that call fails, then the first call looks for | |
349 | "x". */ | |
350 | ||
351 | static struct symbol * | |
352 | lookup_namespace_scope (const char *name, | |
353 | const char *linkage_name, | |
354 | const struct block *block, | |
355 | const domain_enum domain, | |
356 | struct symtab **symtab, | |
357 | const char *scope, | |
358 | int scope_len) | |
359 | { | |
360 | char *namespace; | |
361 | ||
362 | if (scope[scope_len] != '\0') | |
363 | { | |
364 | /* Recursively search for names in child namespaces first. */ | |
365 | ||
366 | struct symbol *sym; | |
367 | int new_scope_len = scope_len; | |
368 | ||
369 | /* If the current scope is followed by "::", skip past that. */ | |
370 | if (new_scope_len != 0) | |
371 | { | |
372 | gdb_assert (scope[new_scope_len] == ':'); | |
373 | new_scope_len += 2; | |
374 | } | |
375 | new_scope_len += cp_find_first_component (scope + new_scope_len); | |
376 | sym = lookup_namespace_scope (name, linkage_name, block, | |
377 | domain, symtab, | |
378 | scope, new_scope_len); | |
379 | if (sym != NULL) | |
380 | return sym; | |
381 | } | |
382 | ||
383 | /* Okay, we didn't find a match in our children, so look for the | |
384 | name in the current namespace. */ | |
385 | ||
386 | namespace = alloca (scope_len + 1); | |
387 | strncpy (namespace, scope, scope_len); | |
388 | namespace[scope_len] = '\0'; | |
389 | return cp_lookup_symbol_namespace (namespace, name, linkage_name, | |
390 | block, domain, symtab); | |
391 | } | |
392 | ||
393 | /* Look up NAME in the C++ namespace NAMESPACE, applying the using | |
394 | directives that are active in BLOCK. Other arguments are as in | |
395 | cp_lookup_symbol_nonlocal. */ | |
396 | ||
397 | struct symbol * | |
398 | cp_lookup_symbol_namespace (const char *namespace, | |
399 | const char *name, | |
400 | const char *linkage_name, | |
401 | const struct block *block, | |
402 | const domain_enum domain, | |
403 | struct symtab **symtab) | |
404 | { | |
405 | const struct using_direct *current; | |
406 | struct symbol *sym; | |
407 | ||
408 | /* First, go through the using directives. If any of them add new | |
409 | names to the namespace we're searching in, see if we can find a | |
410 | match by applying them. */ | |
411 | ||
412 | for (current = block_using (block); | |
413 | current != NULL; | |
414 | current = current->next) | |
415 | { | |
416 | if (strcmp (namespace, current->outer) == 0) | |
417 | { | |
418 | sym = cp_lookup_symbol_namespace (current->inner, | |
419 | name, | |
420 | linkage_name, | |
421 | block, | |
422 | domain, | |
423 | symtab); | |
424 | if (sym != NULL) | |
425 | return sym; | |
426 | } | |
427 | } | |
428 | ||
429 | /* We didn't find anything by applying any of the using directives | |
430 | that are still applicable; so let's see if we've got a match | |
431 | using the current namespace. */ | |
432 | ||
433 | if (namespace[0] == '\0') | |
434 | { | |
435 | return lookup_symbol_file (name, linkage_name, block, | |
436 | domain, symtab, 0); | |
437 | } | |
438 | else | |
439 | { | |
440 | char *concatenated_name | |
441 | = alloca (strlen (namespace) + 2 + strlen (name) + 1); | |
442 | strcpy (concatenated_name, namespace); | |
443 | strcat (concatenated_name, "::"); | |
444 | strcat (concatenated_name, name); | |
445 | sym = lookup_symbol_file (concatenated_name, linkage_name, | |
446 | block, domain, symtab, | |
447 | cp_is_anonymous (namespace)); | |
448 | return sym; | |
449 | } | |
450 | } | |
451 | ||
452 | /* Look up NAME in BLOCK's static block and in global blocks. If | |
453 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located | |
454 | within an anonymous namespace. Other arguments are as in | |
455 | cp_lookup_symbol_nonlocal. */ | |
456 | ||
457 | static struct symbol * | |
458 | lookup_symbol_file (const char *name, | |
459 | const char *linkage_name, | |
460 | const struct block *block, | |
461 | const domain_enum domain, | |
462 | struct symtab **symtab, | |
463 | int anonymous_namespace) | |
464 | { | |
465 | struct symbol *sym = NULL; | |
466 | ||
467 | sym = lookup_symbol_static (name, linkage_name, block, domain, symtab); | |
468 | if (sym != NULL) | |
469 | return sym; | |
470 | ||
471 | if (anonymous_namespace) | |
472 | { | |
473 | /* Symbols defined in anonymous namespaces have external linkage | |
474 | but should be treated as local to a single file nonetheless. | |
475 | So we only search the current file's global block. */ | |
476 | ||
477 | const struct block *global_block = block_global_block (block); | |
478 | ||
479 | if (global_block != NULL) | |
5c4e30ca DC |
480 | sym = lookup_symbol_aux_block (name, linkage_name, global_block, |
481 | domain, symtab); | |
1fcb5155 DC |
482 | } |
483 | else | |
484 | { | |
5c4e30ca DC |
485 | sym = lookup_symbol_global (name, linkage_name, domain, symtab); |
486 | } | |
487 | ||
488 | if (sym != NULL) | |
489 | return sym; | |
490 | ||
491 | /* Now call "lookup_possible_namespace_symbol". Symbols in here | |
492 | claim to be associated to namespaces, but this claim might be | |
493 | incorrect: the names in question might actually correspond to | |
494 | classes instead of namespaces. But if they correspond to | |
495 | classes, then we should have found a match for them above. So if | |
496 | we find them now, they should be genuine. */ | |
497 | ||
498 | /* FIXME: carlton/2003-06-12: This is a hack and should eventually | |
499 | be deleted: see comments below. */ | |
500 | ||
501 | if (domain == VAR_DOMAIN) | |
502 | { | |
503 | sym = lookup_possible_namespace_symbol (name, symtab); | |
504 | if (sym != NULL) | |
505 | return sym; | |
506 | } | |
507 | ||
508 | return NULL; | |
509 | } | |
510 | ||
79c2c32d DC |
511 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
512 | class or namespace given by PARENT_TYPE, from within the context | |
513 | given by BLOCK. Return NULL if there is no such nested type. */ | |
514 | ||
515 | /* FIXME: carlton/2003-09-24: For now, this only works for nested | |
516 | namespaces; the patch to make this work on other sorts of nested | |
517 | types is next on my TODO list. */ | |
518 | ||
519 | struct type * | |
520 | cp_lookup_nested_type (struct type *parent_type, | |
521 | const char *nested_name, | |
522 | const struct block *block) | |
523 | { | |
524 | switch (TYPE_CODE (parent_type)) | |
525 | { | |
526 | case TYPE_CODE_NAMESPACE: | |
527 | { | |
528 | const char *parent_name = TYPE_TAG_NAME (parent_type); | |
529 | struct symbol *sym = cp_lookup_symbol_namespace (parent_name, | |
530 | nested_name, | |
531 | NULL, | |
532 | block, | |
533 | VAR_DOMAIN, | |
534 | NULL); | |
535 | if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF) | |
536 | return NULL; | |
537 | else | |
538 | return SYMBOL_TYPE (sym); | |
539 | } | |
540 | default: | |
541 | internal_error (__FILE__, __LINE__, | |
542 | "cp_lookup_nested_type called on a non-namespace."); | |
543 | } | |
544 | } | |
545 | ||
5c4e30ca DC |
546 | /* Now come functions for dealing with symbols associated to |
547 | namespaces. (They're used to store the namespaces themselves, not | |
548 | objects that live in the namespaces.) These symbols come in two | |
549 | varieties: if we run into a DW_TAG_namespace DIE, then we know that | |
550 | we have a namespace, so dwarf2read.c creates a symbol for it just | |
551 | like normal. But, unfortunately, versions of GCC through at least | |
552 | 3.3 don't generate those DIE's. Our solution is to try to guess | |
553 | their existence by looking at demangled names. This might cause us | |
554 | to misidentify classes as namespaces, however. So we put those | |
555 | symbols in a special block (one per objfile), and we only search | |
556 | that block as a last resort. */ | |
557 | ||
558 | /* FIXME: carlton/2003-06-12: Once versions of GCC that generate | |
559 | DW_TAG_namespace have been out for a year or two, we should get rid | |
560 | of all of this "possible namespace" nonsense. */ | |
561 | ||
562 | /* Allocate everything necessary for the possible namespace block | |
563 | associated to OBJFILE. */ | |
564 | ||
565 | static void | |
566 | initialize_namespace_symtab (struct objfile *objfile) | |
567 | { | |
568 | struct symtab *namespace_symtab; | |
569 | struct blockvector *bv; | |
570 | struct block *bl; | |
571 | ||
572 | namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); | |
573 | namespace_symtab->language = language_cplus; | |
574 | namespace_symtab->free_code = free_nothing; | |
575 | namespace_symtab->dirname = NULL; | |
576 | ||
577 | bv = obstack_alloc (&objfile->symbol_obstack, | |
578 | sizeof (struct blockvector) | |
579 | + FIRST_LOCAL_BLOCK * sizeof (struct block *)); | |
580 | BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; | |
581 | BLOCKVECTOR (namespace_symtab) = bv; | |
582 | ||
583 | /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ | |
584 | ||
585 | bl = allocate_block (&objfile->symbol_obstack); | |
586 | BLOCK_DICT (bl) = dict_create_linear (&objfile->symbol_obstack, | |
587 | NULL); | |
588 | BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; | |
589 | bl = allocate_block (&objfile->symbol_obstack); | |
590 | BLOCK_DICT (bl) = dict_create_linear (&objfile->symbol_obstack, | |
591 | NULL); | |
592 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; | |
593 | ||
594 | /* Allocate the possible namespace block; we put it where the first | |
595 | local block will live, though I don't think there's any need to | |
596 | pretend that it's actually a local block (e.g. by setting | |
597 | BLOCK_SUPERBLOCK appropriately). We don't use the global or | |
598 | static block because we don't want it searched during the normal | |
599 | search of all global/static blocks in lookup_symbol: we only want | |
600 | it used as a last resort. */ | |
601 | ||
602 | /* NOTE: carlton/2003-09-11: I considered not associating the fake | |
603 | symbols to a block/symtab at all. But that would cause problems | |
604 | with lookup_symbol's SYMTAB argument and with block_found, so | |
605 | having a symtab/block for this purpose seems like the best | |
606 | solution for now. */ | |
607 | ||
608 | bl = allocate_block (&objfile->symbol_obstack); | |
609 | BLOCK_DICT (bl) = dict_create_hashed_expandable (); | |
610 | BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; | |
611 | ||
612 | namespace_symtab->free_func = free_namespace_block; | |
613 | ||
614 | objfile->cp_namespace_symtab = namespace_symtab; | |
615 | } | |
616 | ||
617 | /* Locate the possible namespace block associated to OBJFILE, | |
618 | allocating it if necessary. */ | |
619 | ||
620 | static struct block * | |
621 | get_possible_namespace_block (struct objfile *objfile) | |
622 | { | |
623 | if (objfile->cp_namespace_symtab == NULL) | |
624 | initialize_namespace_symtab (objfile); | |
625 | ||
626 | return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), | |
627 | FIRST_LOCAL_BLOCK); | |
628 | } | |
629 | ||
630 | /* Free the dictionary associated to the possible namespace block. */ | |
631 | ||
632 | static void | |
633 | free_namespace_block (struct symtab *symtab) | |
634 | { | |
635 | struct block *possible_namespace_block; | |
636 | ||
637 | possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), | |
638 | FIRST_LOCAL_BLOCK); | |
639 | gdb_assert (possible_namespace_block != NULL); | |
640 | dict_free (BLOCK_DICT (possible_namespace_block)); | |
641 | } | |
642 | ||
643 | /* Ensure that there are symbols in the possible namespace block | |
644 | associated to OBJFILE for all initial substrings of NAME that look | |
645 | like namespaces or classes. NAME should end in a member variable: | |
646 | it shouldn't consist solely of namespaces. */ | |
647 | ||
648 | void | |
649 | cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) | |
650 | { | |
651 | check_possible_namespace_symbols_loop (name, | |
652 | cp_find_first_component (name), | |
653 | objfile); | |
654 | } | |
655 | ||
656 | /* This is a helper loop for cp_check_possible_namespace_symbols; it | |
657 | ensures that there are symbols in the possible namespace block | |
658 | associated to OBJFILE for all namespaces that are initial | |
659 | substrings of NAME of length at least LEN. It returns 1 if a | |
660 | previous loop had already created the shortest such symbol and 0 | |
661 | otherwise. | |
662 | ||
663 | This function assumes that if there is already a symbol associated | |
664 | to a substring of NAME of a given length, then there are already | |
665 | symbols associated to all substrings of NAME whose length is less | |
666 | than that length. So if cp_check_possible_namespace_symbols has | |
667 | been called once with argument "A::B::C::member", then that will | |
668 | create symbols "A", "A::B", and "A::B::C". If it is then later | |
669 | called with argument "A::B::D::member", then the new call will | |
670 | generate a new symbol for "A::B::D", but once it sees that "A::B" | |
671 | has already been created, it doesn't bother checking to see if "A" | |
672 | has also been created. */ | |
673 | ||
674 | static int | |
675 | check_possible_namespace_symbols_loop (const char *name, int len, | |
676 | struct objfile *objfile) | |
677 | { | |
678 | if (name[len] == ':') | |
679 | { | |
680 | int done; | |
681 | int next_len = len + 2; | |
682 | ||
683 | next_len += cp_find_first_component (name + next_len); | |
684 | done = check_possible_namespace_symbols_loop (name, next_len, | |
685 | objfile); | |
686 | ||
687 | if (!done) | |
688 | done = check_one_possible_namespace_symbol (name, len, objfile); | |
689 | ||
690 | return done; | |
1fcb5155 | 691 | } |
5c4e30ca DC |
692 | else |
693 | return 0; | |
694 | } | |
695 | ||
696 | /* Check to see if there's already a possible namespace symbol in | |
697 | OBJFILE whose name is the initial substring of NAME of length LEN. | |
698 | If not, create one and return 0; otherwise, return 1. */ | |
699 | ||
700 | static int | |
701 | check_one_possible_namespace_symbol (const char *name, int len, | |
702 | struct objfile *objfile) | |
703 | { | |
704 | struct block *block = get_possible_namespace_block (objfile); | |
705 | char *name_copy = obsavestring (name, len, &objfile->symbol_obstack); | |
706 | struct symbol *sym = lookup_block_symbol (block, name_copy, NULL, | |
707 | VAR_DOMAIN); | |
708 | ||
709 | if (sym == NULL) | |
710 | { | |
711 | struct type *type = init_type (TYPE_CODE_NAMESPACE, 0, 0, | |
712 | name_copy, objfile); | |
713 | TYPE_TAG_NAME (type) = TYPE_NAME (type); | |
714 | ||
715 | sym = obstack_alloc (&objfile->symbol_obstack, sizeof (struct symbol)); | |
716 | memset (sym, 0, sizeof (struct symbol)); | |
717 | SYMBOL_LANGUAGE (sym) = language_cplus; | |
718 | SYMBOL_SET_NAMES (sym, name_copy, len, objfile); | |
719 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; | |
720 | SYMBOL_TYPE (sym) = type; | |
721 | SYMBOL_DOMAIN (sym) = VAR_DOMAIN; | |
722 | ||
723 | dict_add_symbol (BLOCK_DICT (block), sym); | |
724 | ||
725 | return 0; | |
726 | } | |
727 | else | |
728 | { | |
729 | obstack_free (&objfile->symbol_obstack, name_copy); | |
730 | ||
731 | return 1; | |
732 | } | |
733 | } | |
734 | ||
735 | /* Look for a symbol named NAME in all the possible namespace blocks. | |
736 | If one is found, return it; if SYMTAB is non-NULL, set *SYMTAB to | |
737 | equal the symtab where it was found. */ | |
738 | ||
739 | static struct symbol * | |
740 | lookup_possible_namespace_symbol (const char *name, struct symtab **symtab) | |
741 | { | |
742 | struct objfile *objfile; | |
743 | ||
744 | ALL_OBJFILES (objfile) | |
745 | { | |
746 | struct symbol *sym; | |
747 | ||
748 | sym = lookup_block_symbol (get_possible_namespace_block (objfile), | |
749 | name, NULL, VAR_DOMAIN); | |
750 | ||
751 | if (sym != NULL) | |
752 | { | |
753 | if (symtab != NULL) | |
754 | *symtab = objfile->cp_namespace_symtab; | |
755 | ||
756 | return sym; | |
757 | } | |
758 | } | |
759 | ||
760 | return NULL; | |
761 | } | |
762 | ||
763 | /* Print out all the possible namespace symbols. */ | |
764 | ||
765 | static void | |
766 | maintenance_cplus_namespace (char *args, int from_tty) | |
767 | { | |
768 | struct objfile *objfile; | |
769 | printf_unfiltered ("Possible namespaces:\n"); | |
770 | ALL_OBJFILES (objfile) | |
771 | { | |
772 | struct dict_iterator iter; | |
773 | struct symbol *sym; | |
774 | ||
775 | ALL_BLOCK_SYMBOLS (get_possible_namespace_block (objfile), iter, sym) | |
776 | { | |
777 | printf_unfiltered ("%s\n", SYMBOL_PRINT_NAME (sym)); | |
778 | } | |
779 | } | |
780 | } | |
781 | ||
782 | void | |
783 | _initialize_cp_namespace (void) | |
784 | { | |
785 | add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, | |
786 | "Print the list of possible C++ namespaces.", | |
787 | &maint_cplus_cmd_list); | |
1fcb5155 | 788 | } |