Commit | Line | Data |
---|---|---|
9219021c | 1 | /* Helper routines for C++ support in GDB. |
9b254dd1 | 2 | Copyright (C) 2003, 2004, 2007, 2008 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, | |
1fcb5155 DC |
76 | const char *scope, |
77 | int scope_len); | |
78 | ||
79 | static struct symbol *lookup_symbol_file (const char *name, | |
80 | const char *linkage_name, | |
81 | const struct block *block, | |
82 | const domain_enum domain, | |
1fcb5155 DC |
83 | int anonymous_namespace); |
84 | ||
b368761e DC |
85 | static struct type *cp_lookup_transparent_type_loop (const char *name, |
86 | const char *scope, | |
87 | int scope_len); | |
88 | ||
5c4e30ca DC |
89 | static void initialize_namespace_symtab (struct objfile *objfile); |
90 | ||
91 | static struct block *get_possible_namespace_block (struct objfile *objfile); | |
92 | ||
93 | static void free_namespace_block (struct symtab *symtab); | |
94 | ||
95 | static int check_possible_namespace_symbols_loop (const char *name, | |
96 | int len, | |
97 | struct objfile *objfile); | |
98 | ||
99 | static int check_one_possible_namespace_symbol (const char *name, | |
100 | int len, | |
101 | struct objfile *objfile); | |
102 | ||
21b556f4 | 103 | static struct symbol *lookup_possible_namespace_symbol (const char *name); |
5c4e30ca DC |
104 | |
105 | static void maintenance_cplus_namespace (char *args, int from_tty); | |
106 | ||
9219021c DC |
107 | /* Set up support for dealing with C++ namespace info in the current |
108 | symtab. */ | |
109 | ||
110 | void cp_initialize_namespace () | |
111 | { | |
112 | processing_has_namespace_info = 0; | |
113 | using_list = NULL; | |
114 | } | |
115 | ||
116 | /* Add all the using directives we've gathered to the current symtab. | |
117 | STATIC_BLOCK should be the symtab's static block; OBSTACK is used | |
118 | for allocation. */ | |
119 | ||
120 | void | |
121 | cp_finalize_namespace (struct block *static_block, | |
122 | struct obstack *obstack) | |
123 | { | |
124 | if (using_list != NULL) | |
125 | { | |
126 | block_set_using (static_block, | |
127 | cp_copy_usings (using_list, obstack), | |
128 | obstack); | |
129 | using_list = NULL; | |
130 | } | |
131 | } | |
132 | ||
133 | /* Check to see if SYMBOL refers to an object contained within an | |
134 | anonymous namespace; if so, add an appropriate using directive. */ | |
135 | ||
136 | /* Optimize away strlen ("(anonymous namespace)"). */ | |
137 | ||
138 | #define ANONYMOUS_NAMESPACE_LEN 21 | |
139 | ||
140 | void | |
141 | cp_scan_for_anonymous_namespaces (const struct symbol *symbol) | |
142 | { | |
143 | if (!processing_has_namespace_info | |
144 | && SYMBOL_CPLUS_DEMANGLED_NAME (symbol) != NULL) | |
145 | { | |
146 | const char *name = SYMBOL_CPLUS_DEMANGLED_NAME (symbol); | |
147 | unsigned int previous_component; | |
148 | unsigned int next_component; | |
149 | const char *len; | |
150 | ||
151 | /* Start with a quick-and-dirty check for mention of "(anonymous | |
152 | namespace)". */ | |
153 | ||
154 | if (!cp_is_anonymous (name)) | |
155 | return; | |
156 | ||
157 | previous_component = 0; | |
158 | next_component = cp_find_first_component (name + previous_component); | |
159 | ||
160 | while (name[next_component] == ':') | |
161 | { | |
162 | if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN | |
163 | && strncmp (name + previous_component, | |
164 | "(anonymous namespace)", | |
165 | ANONYMOUS_NAMESPACE_LEN) == 0) | |
166 | { | |
167 | /* We've found a component of the name that's an | |
168 | anonymous namespace. So add symbols in it to the | |
169 | namespace given by the previous component if there is | |
170 | one, or to the global namespace if there isn't. */ | |
171 | cp_add_using_directive (name, | |
172 | previous_component == 0 | |
173 | ? 0 : previous_component - 2, | |
174 | next_component); | |
175 | } | |
176 | /* The "+ 2" is for the "::". */ | |
177 | previous_component = next_component + 2; | |
178 | next_component = (previous_component | |
179 | + cp_find_first_component (name | |
180 | + previous_component)); | |
181 | } | |
182 | } | |
183 | } | |
184 | ||
185 | /* Add a using directive to using_list. NAME is the start of a string | |
186 | that should contain the namespaces we want to add as initial | |
187 | substrings, OUTER_LENGTH is the end of the outer namespace, and | |
188 | INNER_LENGTH is the end of the inner namespace. If the using | |
189 | directive in question has already been added, don't add it | |
190 | twice. */ | |
191 | ||
192 | void | |
193 | cp_add_using_directive (const char *name, unsigned int outer_length, | |
194 | unsigned int inner_length) | |
195 | { | |
196 | struct using_direct *current; | |
197 | struct using_direct *new; | |
198 | ||
199 | /* Has it already been added? */ | |
200 | ||
201 | for (current = using_list; current != NULL; current = current->next) | |
202 | { | |
203 | if ((strncmp (current->inner, name, inner_length) == 0) | |
204 | && (strlen (current->inner) == inner_length) | |
205 | && (strlen (current->outer) == outer_length)) | |
206 | return; | |
207 | } | |
208 | ||
209 | using_list = cp_add_using (name, inner_length, outer_length, | |
210 | using_list); | |
211 | } | |
212 | ||
213 | /* Record the namespace that the function defined by SYMBOL was | |
214 | defined in, if necessary. BLOCK is the associated block; use | |
215 | OBSTACK for allocation. */ | |
216 | ||
217 | void | |
218 | cp_set_block_scope (const struct symbol *symbol, | |
219 | struct block *block, | |
220 | struct obstack *obstack) | |
221 | { | |
222 | /* Make sure that the name was originally mangled: if not, there | |
223 | certainly isn't any namespace information to worry about! */ | |
224 | ||
225 | if (SYMBOL_CPLUS_DEMANGLED_NAME (symbol) != NULL) | |
226 | { | |
227 | if (processing_has_namespace_info) | |
228 | { | |
229 | block_set_scope | |
38d518c9 EZ |
230 | (block, obsavestring (processing_current_prefix, |
231 | strlen (processing_current_prefix), | |
9219021c DC |
232 | obstack), |
233 | obstack); | |
234 | } | |
235 | else | |
236 | { | |
237 | /* Try to figure out the appropriate namespace from the | |
238 | demangled name. */ | |
239 | ||
240 | /* FIXME: carlton/2003-04-15: If the function in question is | |
241 | a method of a class, the name will actually include the | |
242 | name of the class as well. This should be harmless, but | |
243 | is a little unfortunate. */ | |
244 | ||
245 | const char *name = SYMBOL_CPLUS_DEMANGLED_NAME (symbol); | |
246 | unsigned int prefix_len = cp_entire_prefix_len (name); | |
247 | ||
248 | block_set_scope (block, | |
249 | obsavestring (name, prefix_len, obstack), | |
250 | obstack); | |
251 | } | |
252 | } | |
253 | } | |
254 | ||
255 | /* Test whether or not NAMESPACE looks like it mentions an anonymous | |
256 | namespace; return nonzero if so. */ | |
257 | ||
258 | int | |
259 | cp_is_anonymous (const char *namespace) | |
260 | { | |
261 | return (strstr (namespace, "(anonymous namespace)") | |
262 | != NULL); | |
263 | } | |
264 | ||
265 | /* Create a new struct using direct whose inner namespace is the | |
266 | initial substring of NAME of leng INNER_LEN and whose outer | |
267 | namespace is the initial substring of NAME of length OUTER_LENGTH. | |
268 | Set its next member in the linked list to NEXT; allocate all memory | |
269 | using xmalloc. It copies the strings, so NAME can be a temporary | |
270 | string. */ | |
271 | ||
272 | static struct using_direct * | |
273 | cp_add_using (const char *name, | |
274 | unsigned int inner_len, | |
275 | unsigned int outer_len, | |
276 | struct using_direct *next) | |
277 | { | |
278 | struct using_direct *retval; | |
279 | ||
280 | gdb_assert (outer_len < inner_len); | |
281 | ||
282 | retval = xmalloc (sizeof (struct using_direct)); | |
283 | retval->inner = savestring (name, inner_len); | |
284 | retval->outer = savestring (name, outer_len); | |
285 | retval->next = next; | |
286 | ||
287 | return retval; | |
288 | } | |
289 | ||
290 | /* Make a copy of the using directives in the list pointed to by | |
291 | USING, using OBSTACK to allocate memory. Free all memory pointed | |
292 | to by USING via xfree. */ | |
293 | ||
294 | static struct using_direct * | |
295 | cp_copy_usings (struct using_direct *using, | |
296 | struct obstack *obstack) | |
297 | { | |
298 | if (using == NULL) | |
299 | { | |
300 | return NULL; | |
301 | } | |
302 | else | |
303 | { | |
304 | struct using_direct *retval | |
305 | = obstack_alloc (obstack, sizeof (struct using_direct)); | |
306 | retval->inner = obsavestring (using->inner, strlen (using->inner), | |
307 | obstack); | |
308 | retval->outer = obsavestring (using->outer, strlen (using->outer), | |
309 | obstack); | |
310 | retval->next = cp_copy_usings (using->next, obstack); | |
311 | ||
312 | xfree (using->inner); | |
313 | xfree (using->outer); | |
314 | xfree (using); | |
315 | ||
316 | return retval; | |
317 | } | |
318 | } | |
1fcb5155 DC |
319 | |
320 | /* The C++-specific version of name lookup for static and global | |
321 | names. This makes sure that names get looked for in all namespaces | |
322 | that are in scope. NAME is the natural name of the symbol that | |
323 | we're looking for, LINKAGE_NAME (which is optional) is its linkage | |
324 | name, BLOCK is the block that we're searching within, DOMAIN says | |
325 | what kind of symbols we're looking for, and if SYMTAB is non-NULL, | |
326 | we should store the symtab where we found the symbol in it. */ | |
327 | ||
328 | struct symbol * | |
329 | cp_lookup_symbol_nonlocal (const char *name, | |
330 | const char *linkage_name, | |
331 | const struct block *block, | |
21b556f4 | 332 | const domain_enum domain) |
1fcb5155 DC |
333 | { |
334 | return lookup_namespace_scope (name, linkage_name, block, domain, | |
21b556f4 | 335 | block_scope (block), 0); |
1fcb5155 DC |
336 | } |
337 | ||
338 | /* Lookup NAME at namespace scope (or, in C terms, in static and | |
339 | global variables). SCOPE is the namespace that the current | |
340 | function is defined within; only consider namespaces whose length | |
341 | is at least SCOPE_LEN. Other arguments are as in | |
342 | cp_lookup_symbol_nonlocal. | |
343 | ||
344 | For example, if we're within a function A::B::f and looking for a | |
3882f37a | 345 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
1fcb5155 DC |
346 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
347 | but with SCOPE_LEN = 1. And then it calls itself with NAME and | |
348 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for | |
349 | "A::B::x"; if it doesn't find it, then the second call looks for | |
350 | "A::x", and if that call fails, then the first call looks for | |
351 | "x". */ | |
352 | ||
353 | static struct symbol * | |
354 | lookup_namespace_scope (const char *name, | |
355 | const char *linkage_name, | |
356 | const struct block *block, | |
357 | const domain_enum domain, | |
1fcb5155 DC |
358 | const char *scope, |
359 | int scope_len) | |
360 | { | |
361 | char *namespace; | |
362 | ||
363 | if (scope[scope_len] != '\0') | |
364 | { | |
365 | /* Recursively search for names in child namespaces first. */ | |
366 | ||
367 | struct symbol *sym; | |
368 | int new_scope_len = scope_len; | |
369 | ||
370 | /* If the current scope is followed by "::", skip past that. */ | |
371 | if (new_scope_len != 0) | |
372 | { | |
373 | gdb_assert (scope[new_scope_len] == ':'); | |
374 | new_scope_len += 2; | |
375 | } | |
376 | new_scope_len += cp_find_first_component (scope + new_scope_len); | |
377 | sym = lookup_namespace_scope (name, linkage_name, block, | |
21b556f4 | 378 | domain, scope, new_scope_len); |
1fcb5155 DC |
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, | |
21b556f4 | 390 | block, domain); |
1fcb5155 DC |
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, | |
21b556f4 | 402 | const domain_enum domain) |
1fcb5155 DC |
403 | { |
404 | const struct using_direct *current; | |
405 | struct symbol *sym; | |
406 | ||
407 | /* First, go through the using directives. If any of them add new | |
408 | names to the namespace we're searching in, see if we can find a | |
409 | match by applying them. */ | |
410 | ||
411 | for (current = block_using (block); | |
412 | current != NULL; | |
413 | current = current->next) | |
414 | { | |
415 | if (strcmp (namespace, current->outer) == 0) | |
416 | { | |
417 | sym = cp_lookup_symbol_namespace (current->inner, | |
418 | name, | |
419 | linkage_name, | |
420 | block, | |
21b556f4 | 421 | domain); |
1fcb5155 DC |
422 | if (sym != NULL) |
423 | return sym; | |
424 | } | |
425 | } | |
426 | ||
427 | /* We didn't find anything by applying any of the using directives | |
428 | that are still applicable; so let's see if we've got a match | |
429 | using the current namespace. */ | |
430 | ||
431 | if (namespace[0] == '\0') | |
432 | { | |
433 | return lookup_symbol_file (name, linkage_name, block, | |
21b556f4 | 434 | domain, 0); |
1fcb5155 DC |
435 | } |
436 | else | |
437 | { | |
438 | char *concatenated_name | |
439 | = alloca (strlen (namespace) + 2 + strlen (name) + 1); | |
440 | strcpy (concatenated_name, namespace); | |
441 | strcat (concatenated_name, "::"); | |
442 | strcat (concatenated_name, name); | |
443 | sym = lookup_symbol_file (concatenated_name, linkage_name, | |
21b556f4 | 444 | block, domain, |
1fcb5155 DC |
445 | cp_is_anonymous (namespace)); |
446 | return sym; | |
447 | } | |
448 | } | |
449 | ||
450 | /* Look up NAME in BLOCK's static block and in global blocks. If | |
451 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located | |
452 | within an anonymous namespace. Other arguments are as in | |
453 | cp_lookup_symbol_nonlocal. */ | |
454 | ||
455 | static struct symbol * | |
456 | lookup_symbol_file (const char *name, | |
457 | const char *linkage_name, | |
458 | const struct block *block, | |
459 | const domain_enum domain, | |
1fcb5155 DC |
460 | int anonymous_namespace) |
461 | { | |
462 | struct symbol *sym = NULL; | |
463 | ||
21b556f4 | 464 | sym = lookup_symbol_static (name, linkage_name, block, domain); |
1fcb5155 DC |
465 | if (sym != NULL) |
466 | return sym; | |
467 | ||
468 | if (anonymous_namespace) | |
469 | { | |
470 | /* Symbols defined in anonymous namespaces have external linkage | |
471 | but should be treated as local to a single file nonetheless. | |
472 | So we only search the current file's global block. */ | |
473 | ||
474 | const struct block *global_block = block_global_block (block); | |
475 | ||
476 | if (global_block != NULL) | |
5c4e30ca | 477 | sym = lookup_symbol_aux_block (name, linkage_name, global_block, |
21b556f4 | 478 | domain); |
1fcb5155 DC |
479 | } |
480 | else | |
481 | { | |
21b556f4 | 482 | sym = lookup_symbol_global (name, linkage_name, block, domain); |
5c4e30ca DC |
483 | } |
484 | ||
485 | if (sym != NULL) | |
486 | return sym; | |
487 | ||
488 | /* Now call "lookup_possible_namespace_symbol". Symbols in here | |
489 | claim to be associated to namespaces, but this claim might be | |
490 | incorrect: the names in question might actually correspond to | |
491 | classes instead of namespaces. But if they correspond to | |
492 | classes, then we should have found a match for them above. So if | |
493 | we find them now, they should be genuine. */ | |
494 | ||
495 | /* FIXME: carlton/2003-06-12: This is a hack and should eventually | |
496 | be deleted: see comments below. */ | |
497 | ||
498 | if (domain == VAR_DOMAIN) | |
499 | { | |
21b556f4 | 500 | sym = lookup_possible_namespace_symbol (name); |
5c4e30ca DC |
501 | if (sym != NULL) |
502 | return sym; | |
503 | } | |
504 | ||
505 | return NULL; | |
506 | } | |
507 | ||
79c2c32d DC |
508 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
509 | class or namespace given by PARENT_TYPE, from within the context | |
510 | given by BLOCK. Return NULL if there is no such nested type. */ | |
511 | ||
79c2c32d DC |
512 | struct type * |
513 | cp_lookup_nested_type (struct type *parent_type, | |
514 | const char *nested_name, | |
515 | const struct block *block) | |
516 | { | |
517 | switch (TYPE_CODE (parent_type)) | |
518 | { | |
63d06c5c | 519 | case TYPE_CODE_STRUCT: |
79c2c32d DC |
520 | case TYPE_CODE_NAMESPACE: |
521 | { | |
63d06c5c DC |
522 | /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
523 | of classes like, say, data or function members. Instead, | |
524 | they're just represented by symbols whose names are | |
525 | qualified by the name of the surrounding class. This is | |
526 | just like members of namespaces; in particular, | |
527 | lookup_symbol_namespace works when looking them up. */ | |
528 | ||
79c2c32d DC |
529 | const char *parent_name = TYPE_TAG_NAME (parent_type); |
530 | struct symbol *sym = cp_lookup_symbol_namespace (parent_name, | |
531 | nested_name, | |
532 | NULL, | |
533 | block, | |
21b556f4 | 534 | VAR_DOMAIN); |
79c2c32d DC |
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__, | |
e2e0b3e5 | 542 | _("cp_lookup_nested_type called on a non-aggregate type.")); |
79c2c32d DC |
543 | } |
544 | } | |
545 | ||
b368761e DC |
546 | /* The C++-version of lookup_transparent_type. */ |
547 | ||
548 | /* FIXME: carlton/2004-01-16: The problem that this is trying to | |
549 | address is that, unfortunately, sometimes NAME is wrong: it may not | |
550 | include the name of namespaces enclosing the type in question. | |
551 | lookup_transparent_type gets called when the the type in question | |
552 | is a declaration, and we're trying to find its definition; but, for | |
553 | declarations, our type name deduction mechanism doesn't work. | |
554 | There's nothing we can do to fix this in general, I think, in the | |
555 | absence of debug information about namespaces (I've filed PR | |
556 | gdb/1511 about this); until such debug information becomes more | |
557 | prevalent, one heuristic which sometimes looks is to search for the | |
558 | definition in namespaces containing the current namespace. | |
559 | ||
560 | We should delete this functions once the appropriate debug | |
561 | information becomes more widespread. (GCC 3.4 will be the first | |
562 | released version of GCC with such information.) */ | |
563 | ||
564 | struct type * | |
565 | cp_lookup_transparent_type (const char *name) | |
566 | { | |
567 | /* First, try the honest way of looking up the definition. */ | |
568 | struct type *t = basic_lookup_transparent_type (name); | |
569 | const char *scope; | |
570 | ||
571 | if (t != NULL) | |
572 | return t; | |
573 | ||
574 | /* If that doesn't work and we're within a namespace, look there | |
575 | instead. */ | |
576 | scope = block_scope (get_selected_block (0)); | |
577 | ||
578 | if (scope[0] == '\0') | |
579 | return NULL; | |
580 | ||
581 | return cp_lookup_transparent_type_loop (name, scope, 0); | |
582 | } | |
583 | ||
584 | /* Lookup the the type definition associated to NAME in | |
585 | namespaces/classes containing SCOPE whose name is strictly longer | |
586 | than LENGTH. LENGTH must be the index of the start of a | |
587 | component of SCOPE. */ | |
588 | ||
589 | static struct type * | |
590 | cp_lookup_transparent_type_loop (const char *name, const char *scope, | |
591 | int length) | |
592 | { | |
1198ecbe | 593 | int scope_length = length + cp_find_first_component (scope + length); |
b368761e DC |
594 | char *full_name; |
595 | ||
596 | /* If the current scope is followed by "::", look in the next | |
597 | component. */ | |
598 | if (scope[scope_length] == ':') | |
599 | { | |
600 | struct type *retval | |
601 | = cp_lookup_transparent_type_loop (name, scope, scope_length + 2); | |
602 | if (retval != NULL) | |
603 | return retval; | |
604 | } | |
605 | ||
606 | full_name = alloca (scope_length + 2 + strlen (name) + 1); | |
607 | strncpy (full_name, scope, scope_length); | |
608 | strncpy (full_name + scope_length, "::", 2); | |
609 | strcpy (full_name + scope_length + 2, name); | |
610 | ||
611 | return basic_lookup_transparent_type (full_name); | |
612 | } | |
613 | ||
5c4e30ca DC |
614 | /* Now come functions for dealing with symbols associated to |
615 | namespaces. (They're used to store the namespaces themselves, not | |
616 | objects that live in the namespaces.) These symbols come in two | |
617 | varieties: if we run into a DW_TAG_namespace DIE, then we know that | |
618 | we have a namespace, so dwarf2read.c creates a symbol for it just | |
619 | like normal. But, unfortunately, versions of GCC through at least | |
620 | 3.3 don't generate those DIE's. Our solution is to try to guess | |
621 | their existence by looking at demangled names. This might cause us | |
622 | to misidentify classes as namespaces, however. So we put those | |
623 | symbols in a special block (one per objfile), and we only search | |
624 | that block as a last resort. */ | |
625 | ||
626 | /* FIXME: carlton/2003-06-12: Once versions of GCC that generate | |
627 | DW_TAG_namespace have been out for a year or two, we should get rid | |
628 | of all of this "possible namespace" nonsense. */ | |
629 | ||
630 | /* Allocate everything necessary for the possible namespace block | |
631 | associated to OBJFILE. */ | |
632 | ||
633 | static void | |
634 | initialize_namespace_symtab (struct objfile *objfile) | |
635 | { | |
636 | struct symtab *namespace_symtab; | |
637 | struct blockvector *bv; | |
638 | struct block *bl; | |
639 | ||
640 | namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); | |
641 | namespace_symtab->language = language_cplus; | |
642 | namespace_symtab->free_code = free_nothing; | |
643 | namespace_symtab->dirname = NULL; | |
644 | ||
4a146b47 | 645 | bv = obstack_alloc (&objfile->objfile_obstack, |
5c4e30ca DC |
646 | sizeof (struct blockvector) |
647 | + FIRST_LOCAL_BLOCK * sizeof (struct block *)); | |
648 | BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; | |
649 | BLOCKVECTOR (namespace_symtab) = bv; | |
650 | ||
651 | /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ | |
652 | ||
4a146b47 EZ |
653 | bl = allocate_block (&objfile->objfile_obstack); |
654 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
655 | NULL); |
656 | BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; | |
4a146b47 EZ |
657 | bl = allocate_block (&objfile->objfile_obstack); |
658 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
659 | NULL); |
660 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; | |
661 | ||
662 | /* Allocate the possible namespace block; we put it where the first | |
663 | local block will live, though I don't think there's any need to | |
664 | pretend that it's actually a local block (e.g. by setting | |
665 | BLOCK_SUPERBLOCK appropriately). We don't use the global or | |
666 | static block because we don't want it searched during the normal | |
667 | search of all global/static blocks in lookup_symbol: we only want | |
668 | it used as a last resort. */ | |
669 | ||
670 | /* NOTE: carlton/2003-09-11: I considered not associating the fake | |
671 | symbols to a block/symtab at all. But that would cause problems | |
672 | with lookup_symbol's SYMTAB argument and with block_found, so | |
673 | having a symtab/block for this purpose seems like the best | |
674 | solution for now. */ | |
675 | ||
4a146b47 | 676 | bl = allocate_block (&objfile->objfile_obstack); |
5c4e30ca DC |
677 | BLOCK_DICT (bl) = dict_create_hashed_expandable (); |
678 | BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; | |
679 | ||
680 | namespace_symtab->free_func = free_namespace_block; | |
681 | ||
682 | objfile->cp_namespace_symtab = namespace_symtab; | |
683 | } | |
684 | ||
685 | /* Locate the possible namespace block associated to OBJFILE, | |
686 | allocating it if necessary. */ | |
687 | ||
688 | static struct block * | |
689 | get_possible_namespace_block (struct objfile *objfile) | |
690 | { | |
691 | if (objfile->cp_namespace_symtab == NULL) | |
692 | initialize_namespace_symtab (objfile); | |
693 | ||
694 | return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), | |
695 | FIRST_LOCAL_BLOCK); | |
696 | } | |
697 | ||
698 | /* Free the dictionary associated to the possible namespace block. */ | |
699 | ||
700 | static void | |
701 | free_namespace_block (struct symtab *symtab) | |
702 | { | |
703 | struct block *possible_namespace_block; | |
704 | ||
705 | possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), | |
706 | FIRST_LOCAL_BLOCK); | |
707 | gdb_assert (possible_namespace_block != NULL); | |
708 | dict_free (BLOCK_DICT (possible_namespace_block)); | |
709 | } | |
710 | ||
711 | /* Ensure that there are symbols in the possible namespace block | |
712 | associated to OBJFILE for all initial substrings of NAME that look | |
713 | like namespaces or classes. NAME should end in a member variable: | |
714 | it shouldn't consist solely of namespaces. */ | |
715 | ||
716 | void | |
717 | cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) | |
718 | { | |
719 | check_possible_namespace_symbols_loop (name, | |
720 | cp_find_first_component (name), | |
721 | objfile); | |
722 | } | |
723 | ||
724 | /* This is a helper loop for cp_check_possible_namespace_symbols; it | |
725 | ensures that there are symbols in the possible namespace block | |
726 | associated to OBJFILE for all namespaces that are initial | |
727 | substrings of NAME of length at least LEN. It returns 1 if a | |
728 | previous loop had already created the shortest such symbol and 0 | |
729 | otherwise. | |
730 | ||
731 | This function assumes that if there is already a symbol associated | |
732 | to a substring of NAME of a given length, then there are already | |
733 | symbols associated to all substrings of NAME whose length is less | |
734 | than that length. So if cp_check_possible_namespace_symbols has | |
735 | been called once with argument "A::B::C::member", then that will | |
736 | create symbols "A", "A::B", and "A::B::C". If it is then later | |
737 | called with argument "A::B::D::member", then the new call will | |
738 | generate a new symbol for "A::B::D", but once it sees that "A::B" | |
739 | has already been created, it doesn't bother checking to see if "A" | |
740 | has also been created. */ | |
741 | ||
742 | static int | |
743 | check_possible_namespace_symbols_loop (const char *name, int len, | |
744 | struct objfile *objfile) | |
745 | { | |
746 | if (name[len] == ':') | |
747 | { | |
748 | int done; | |
749 | int next_len = len + 2; | |
750 | ||
751 | next_len += cp_find_first_component (name + next_len); | |
752 | done = check_possible_namespace_symbols_loop (name, next_len, | |
753 | objfile); | |
754 | ||
755 | if (!done) | |
756 | done = check_one_possible_namespace_symbol (name, len, objfile); | |
757 | ||
758 | return done; | |
1fcb5155 | 759 | } |
5c4e30ca DC |
760 | else |
761 | return 0; | |
762 | } | |
763 | ||
764 | /* Check to see if there's already a possible namespace symbol in | |
765 | OBJFILE whose name is the initial substring of NAME of length LEN. | |
766 | If not, create one and return 0; otherwise, return 1. */ | |
767 | ||
768 | static int | |
769 | check_one_possible_namespace_symbol (const char *name, int len, | |
770 | struct objfile *objfile) | |
771 | { | |
772 | struct block *block = get_possible_namespace_block (objfile); | |
ec5cdd75 DJ |
773 | char *name_copy = alloca (len + 1); |
774 | struct symbol *sym; | |
775 | ||
776 | memcpy (name_copy, name, len); | |
777 | name_copy[len] = '\0'; | |
778 | sym = lookup_block_symbol (block, name_copy, NULL, VAR_DOMAIN); | |
5c4e30ca DC |
779 | |
780 | if (sym == NULL) | |
781 | { | |
ec5cdd75 DJ |
782 | struct type *type; |
783 | name_copy = obsavestring (name, len, &objfile->objfile_obstack); | |
784 | ||
785 | type = init_type (TYPE_CODE_NAMESPACE, 0, 0, name_copy, objfile); | |
786 | ||
5c4e30ca DC |
787 | TYPE_TAG_NAME (type) = TYPE_NAME (type); |
788 | ||
4a146b47 | 789 | sym = obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); |
5c4e30ca DC |
790 | memset (sym, 0, sizeof (struct symbol)); |
791 | SYMBOL_LANGUAGE (sym) = language_cplus; | |
792 | SYMBOL_SET_NAMES (sym, name_copy, len, objfile); | |
793 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; | |
794 | SYMBOL_TYPE (sym) = type; | |
795 | SYMBOL_DOMAIN (sym) = VAR_DOMAIN; | |
796 | ||
797 | dict_add_symbol (BLOCK_DICT (block), sym); | |
798 | ||
799 | return 0; | |
800 | } | |
801 | else | |
ec5cdd75 | 802 | return 1; |
5c4e30ca DC |
803 | } |
804 | ||
805 | /* Look for a symbol named NAME in all the possible namespace blocks. | |
21b556f4 | 806 | If one is found, return it. */ |
5c4e30ca DC |
807 | |
808 | static struct symbol * | |
21b556f4 | 809 | lookup_possible_namespace_symbol (const char *name) |
5c4e30ca DC |
810 | { |
811 | struct objfile *objfile; | |
812 | ||
813 | ALL_OBJFILES (objfile) | |
814 | { | |
815 | struct symbol *sym; | |
816 | ||
817 | sym = lookup_block_symbol (get_possible_namespace_block (objfile), | |
818 | name, NULL, VAR_DOMAIN); | |
819 | ||
820 | if (sym != NULL) | |
21b556f4 | 821 | return sym; |
5c4e30ca DC |
822 | } |
823 | ||
824 | return NULL; | |
825 | } | |
826 | ||
827 | /* Print out all the possible namespace symbols. */ | |
828 | ||
829 | static void | |
830 | maintenance_cplus_namespace (char *args, int from_tty) | |
831 | { | |
832 | struct objfile *objfile; | |
a3f17187 | 833 | printf_unfiltered (_("Possible namespaces:\n")); |
5c4e30ca DC |
834 | ALL_OBJFILES (objfile) |
835 | { | |
836 | struct dict_iterator iter; | |
837 | struct symbol *sym; | |
838 | ||
839 | ALL_BLOCK_SYMBOLS (get_possible_namespace_block (objfile), iter, sym) | |
840 | { | |
841 | printf_unfiltered ("%s\n", SYMBOL_PRINT_NAME (sym)); | |
842 | } | |
843 | } | |
844 | } | |
845 | ||
846 | void | |
847 | _initialize_cp_namespace (void) | |
848 | { | |
849 | add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, | |
1a966eab | 850 | _("Print the list of possible C++ namespaces."), |
5c4e30ca | 851 | &maint_cplus_cmd_list); |
1fcb5155 | 852 | } |