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9219021c | 1 | /* Helper routines for C++ support in GDB. |
0fb0cc75 | 2 | Copyright (C) 2003, 2004, 2007, 2008, 2009 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" |
27aa8d6a | 33 | #include "buildsym.h" |
9219021c DC |
34 | |
35 | static struct using_direct *cp_copy_usings (struct using_direct *using, | |
36 | struct obstack *obstack); | |
37 | ||
1fcb5155 DC |
38 | static struct symbol *lookup_namespace_scope (const char *name, |
39 | const char *linkage_name, | |
40 | const struct block *block, | |
41 | const domain_enum domain, | |
1fcb5155 DC |
42 | const char *scope, |
43 | int scope_len); | |
44 | ||
45 | static struct symbol *lookup_symbol_file (const char *name, | |
46 | const char *linkage_name, | |
47 | const struct block *block, | |
48 | const domain_enum domain, | |
1fcb5155 DC |
49 | int anonymous_namespace); |
50 | ||
b368761e DC |
51 | static struct type *cp_lookup_transparent_type_loop (const char *name, |
52 | const char *scope, | |
53 | int scope_len); | |
54 | ||
5c4e30ca DC |
55 | static void initialize_namespace_symtab (struct objfile *objfile); |
56 | ||
57 | static struct block *get_possible_namespace_block (struct objfile *objfile); | |
58 | ||
59 | static void free_namespace_block (struct symtab *symtab); | |
60 | ||
61 | static int check_possible_namespace_symbols_loop (const char *name, | |
62 | int len, | |
63 | struct objfile *objfile); | |
64 | ||
65 | static int check_one_possible_namespace_symbol (const char *name, | |
66 | int len, | |
67 | struct objfile *objfile); | |
68 | ||
21b556f4 | 69 | static struct symbol *lookup_possible_namespace_symbol (const char *name); |
5c4e30ca DC |
70 | |
71 | static void maintenance_cplus_namespace (char *args, int from_tty); | |
72 | ||
9219021c DC |
73 | /* Check to see if SYMBOL refers to an object contained within an |
74 | anonymous namespace; if so, add an appropriate using directive. */ | |
75 | ||
76 | /* Optimize away strlen ("(anonymous namespace)"). */ | |
77 | ||
78 | #define ANONYMOUS_NAMESPACE_LEN 21 | |
79 | ||
80 | void | |
81 | cp_scan_for_anonymous_namespaces (const struct symbol *symbol) | |
82 | { | |
df8a16a1 | 83 | if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
9219021c | 84 | { |
df8a16a1 | 85 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
9219021c DC |
86 | unsigned int previous_component; |
87 | unsigned int next_component; | |
88 | const char *len; | |
89 | ||
90 | /* Start with a quick-and-dirty check for mention of "(anonymous | |
91 | namespace)". */ | |
92 | ||
93 | if (!cp_is_anonymous (name)) | |
94 | return; | |
95 | ||
96 | previous_component = 0; | |
97 | next_component = cp_find_first_component (name + previous_component); | |
98 | ||
99 | while (name[next_component] == ':') | |
100 | { | |
101 | if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN | |
102 | && strncmp (name + previous_component, | |
103 | "(anonymous namespace)", | |
104 | ANONYMOUS_NAMESPACE_LEN) == 0) | |
105 | { | |
8c902bb1 SW |
106 | int dest_len = (previous_component == 0 ? 0 : previous_component - 2); |
107 | int src_len = next_component; | |
794684b6 | 108 | |
8c902bb1 SW |
109 | char *dest = alloca (dest_len + 1); |
110 | char *src = alloca (src_len + 1); | |
794684b6 | 111 | |
8c902bb1 SW |
112 | memcpy (dest, name, dest_len); |
113 | memcpy (src, name, src_len); | |
794684b6 | 114 | |
8c902bb1 SW |
115 | dest[dest_len] = '\0'; |
116 | src[src_len] = '\0'; | |
794684b6 | 117 | |
9219021c DC |
118 | /* We've found a component of the name that's an |
119 | anonymous namespace. So add symbols in it to the | |
120 | namespace given by the previous component if there is | |
121 | one, or to the global namespace if there isn't. */ | |
8c902bb1 | 122 | cp_add_using_directive (dest, src); |
9219021c DC |
123 | } |
124 | /* The "+ 2" is for the "::". */ | |
125 | previous_component = next_component + 2; | |
126 | next_component = (previous_component | |
127 | + cp_find_first_component (name | |
128 | + previous_component)); | |
129 | } | |
130 | } | |
131 | } | |
132 | ||
794684b6 SW |
133 | /* Add a using directive to using_list. If the using directive in question |
134 | has already been added, don't add it twice. */ | |
9219021c DC |
135 | |
136 | void | |
8c902bb1 | 137 | cp_add_using_directive (const char *dest, const char *src) |
9219021c DC |
138 | { |
139 | struct using_direct *current; | |
140 | struct using_direct *new; | |
141 | ||
142 | /* Has it already been added? */ | |
143 | ||
27aa8d6a | 144 | for (current = using_directives; current != NULL; current = current->next) |
9219021c | 145 | { |
8c902bb1 SW |
146 | if (strcmp (current->import_src, src) == 0 |
147 | && strcmp (current->import_dest, dest) == 0) | |
9219021c DC |
148 | return; |
149 | } | |
150 | ||
8c902bb1 | 151 | using_directives = cp_add_using (dest, src, using_directives); |
794684b6 | 152 | |
9219021c DC |
153 | } |
154 | ||
155 | /* Record the namespace that the function defined by SYMBOL was | |
156 | defined in, if necessary. BLOCK is the associated block; use | |
157 | OBSTACK for allocation. */ | |
158 | ||
159 | void | |
160 | cp_set_block_scope (const struct symbol *symbol, | |
161 | struct block *block, | |
df8a16a1 DJ |
162 | struct obstack *obstack, |
163 | const char *processing_current_prefix, | |
164 | int processing_has_namespace_info) | |
9219021c | 165 | { |
df8a16a1 | 166 | if (processing_has_namespace_info) |
9219021c | 167 | { |
df8a16a1 DJ |
168 | block_set_scope |
169 | (block, obsavestring (processing_current_prefix, | |
170 | strlen (processing_current_prefix), | |
171 | obstack), | |
172 | obstack); | |
173 | } | |
174 | else if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) | |
175 | { | |
176 | /* Try to figure out the appropriate namespace from the | |
177 | demangled name. */ | |
9219021c | 178 | |
df8a16a1 DJ |
179 | /* FIXME: carlton/2003-04-15: If the function in question is |
180 | a method of a class, the name will actually include the | |
181 | name of the class as well. This should be harmless, but | |
182 | is a little unfortunate. */ | |
9219021c | 183 | |
df8a16a1 DJ |
184 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
185 | unsigned int prefix_len = cp_entire_prefix_len (name); | |
9219021c | 186 | |
df8a16a1 DJ |
187 | block_set_scope (block, |
188 | obsavestring (name, prefix_len, obstack), | |
189 | obstack); | |
9219021c DC |
190 | } |
191 | } | |
192 | ||
193 | /* Test whether or not NAMESPACE looks like it mentions an anonymous | |
194 | namespace; return nonzero if so. */ | |
195 | ||
196 | int | |
197 | cp_is_anonymous (const char *namespace) | |
198 | { | |
199 | return (strstr (namespace, "(anonymous namespace)") | |
200 | != NULL); | |
201 | } | |
202 | ||
8c902bb1 SW |
203 | /* Create a new struct using direct which imports the namespace SRC |
204 | into the scope DEST. | |
9219021c DC |
205 | Set its next member in the linked list to NEXT; allocate all memory |
206 | using xmalloc. It copies the strings, so NAME can be a temporary | |
207 | string. */ | |
208 | ||
27aa8d6a | 209 | struct using_direct * |
8c902bb1 SW |
210 | cp_add_using (const char *dest, |
211 | const char *src, | |
9219021c DC |
212 | struct using_direct *next) |
213 | { | |
214 | struct using_direct *retval; | |
215 | ||
9219021c | 216 | retval = xmalloc (sizeof (struct using_direct)); |
8c902bb1 SW |
217 | retval->import_src = savestring (src, strlen(src)); |
218 | retval->import_dest = savestring (dest, strlen(dest)); | |
9219021c DC |
219 | retval->next = next; |
220 | ||
221 | return retval; | |
222 | } | |
223 | ||
224 | /* Make a copy of the using directives in the list pointed to by | |
225 | USING, using OBSTACK to allocate memory. Free all memory pointed | |
226 | to by USING via xfree. */ | |
227 | ||
228 | static struct using_direct * | |
229 | cp_copy_usings (struct using_direct *using, | |
230 | struct obstack *obstack) | |
231 | { | |
232 | if (using == NULL) | |
233 | { | |
234 | return NULL; | |
235 | } | |
236 | else | |
237 | { | |
238 | struct using_direct *retval | |
239 | = obstack_alloc (obstack, sizeof (struct using_direct)); | |
8c902bb1 | 240 | retval->import_src = obsavestring (using->import_src, strlen (using->import_src), |
9219021c | 241 | obstack); |
8c902bb1 | 242 | retval->import_dest = obsavestring (using->import_dest, strlen (using->import_dest), |
9219021c DC |
243 | obstack); |
244 | retval->next = cp_copy_usings (using->next, obstack); | |
245 | ||
8c902bb1 SW |
246 | xfree (using->import_src); |
247 | xfree (using->import_dest); | |
9219021c DC |
248 | xfree (using); |
249 | ||
250 | return retval; | |
251 | } | |
252 | } | |
1fcb5155 DC |
253 | |
254 | /* The C++-specific version of name lookup for static and global | |
255 | names. This makes sure that names get looked for in all namespaces | |
256 | that are in scope. NAME is the natural name of the symbol that | |
257 | we're looking for, LINKAGE_NAME (which is optional) is its linkage | |
258 | name, BLOCK is the block that we're searching within, DOMAIN says | |
259 | what kind of symbols we're looking for, and if SYMTAB is non-NULL, | |
260 | we should store the symtab where we found the symbol in it. */ | |
261 | ||
262 | struct symbol * | |
263 | cp_lookup_symbol_nonlocal (const char *name, | |
264 | const char *linkage_name, | |
265 | const struct block *block, | |
21b556f4 | 266 | const domain_enum domain) |
1fcb5155 DC |
267 | { |
268 | return lookup_namespace_scope (name, linkage_name, block, domain, | |
21b556f4 | 269 | block_scope (block), 0); |
1fcb5155 DC |
270 | } |
271 | ||
272 | /* Lookup NAME at namespace scope (or, in C terms, in static and | |
273 | global variables). SCOPE is the namespace that the current | |
274 | function is defined within; only consider namespaces whose length | |
275 | is at least SCOPE_LEN. Other arguments are as in | |
276 | cp_lookup_symbol_nonlocal. | |
277 | ||
278 | For example, if we're within a function A::B::f and looking for a | |
3882f37a | 279 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
1fcb5155 DC |
280 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
281 | but with SCOPE_LEN = 1. And then it calls itself with NAME and | |
282 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for | |
283 | "A::B::x"; if it doesn't find it, then the second call looks for | |
284 | "A::x", and if that call fails, then the first call looks for | |
285 | "x". */ | |
286 | ||
287 | static struct symbol * | |
288 | lookup_namespace_scope (const char *name, | |
289 | const char *linkage_name, | |
290 | const struct block *block, | |
291 | const domain_enum domain, | |
1fcb5155 DC |
292 | const char *scope, |
293 | int scope_len) | |
294 | { | |
295 | char *namespace; | |
296 | ||
297 | if (scope[scope_len] != '\0') | |
298 | { | |
299 | /* Recursively search for names in child namespaces first. */ | |
300 | ||
301 | struct symbol *sym; | |
302 | int new_scope_len = scope_len; | |
303 | ||
304 | /* If the current scope is followed by "::", skip past that. */ | |
305 | if (new_scope_len != 0) | |
306 | { | |
307 | gdb_assert (scope[new_scope_len] == ':'); | |
308 | new_scope_len += 2; | |
309 | } | |
310 | new_scope_len += cp_find_first_component (scope + new_scope_len); | |
311 | sym = lookup_namespace_scope (name, linkage_name, block, | |
21b556f4 | 312 | domain, scope, new_scope_len); |
1fcb5155 DC |
313 | if (sym != NULL) |
314 | return sym; | |
315 | } | |
316 | ||
317 | /* Okay, we didn't find a match in our children, so look for the | |
318 | name in the current namespace. */ | |
319 | ||
320 | namespace = alloca (scope_len + 1); | |
321 | strncpy (namespace, scope, scope_len); | |
322 | namespace[scope_len] = '\0'; | |
323 | return cp_lookup_symbol_namespace (namespace, name, linkage_name, | |
21b556f4 | 324 | block, domain); |
1fcb5155 DC |
325 | } |
326 | ||
327 | /* Look up NAME in the C++ namespace NAMESPACE, applying the using | |
328 | directives that are active in BLOCK. Other arguments are as in | |
329 | cp_lookup_symbol_nonlocal. */ | |
330 | ||
331 | struct symbol * | |
332 | cp_lookup_symbol_namespace (const char *namespace, | |
333 | const char *name, | |
334 | const char *linkage_name, | |
335 | const struct block *block, | |
21b556f4 | 336 | const domain_enum domain) |
1fcb5155 DC |
337 | { |
338 | const struct using_direct *current; | |
339 | struct symbol *sym; | |
340 | ||
341 | /* First, go through the using directives. If any of them add new | |
342 | names to the namespace we're searching in, see if we can find a | |
343 | match by applying them. */ | |
344 | ||
345 | for (current = block_using (block); | |
346 | current != NULL; | |
347 | current = current->next) | |
348 | { | |
8c902bb1 | 349 | if (strcmp (namespace, current->import_dest) == 0) |
1fcb5155 | 350 | { |
8c902bb1 | 351 | sym = cp_lookup_symbol_namespace (current->import_src, |
1fcb5155 DC |
352 | name, |
353 | linkage_name, | |
354 | block, | |
21b556f4 | 355 | domain); |
1fcb5155 DC |
356 | if (sym != NULL) |
357 | return sym; | |
358 | } | |
359 | } | |
360 | ||
361 | /* We didn't find anything by applying any of the using directives | |
362 | that are still applicable; so let's see if we've got a match | |
363 | using the current namespace. */ | |
364 | ||
365 | if (namespace[0] == '\0') | |
366 | { | |
367 | return lookup_symbol_file (name, linkage_name, block, | |
21b556f4 | 368 | domain, 0); |
1fcb5155 DC |
369 | } |
370 | else | |
371 | { | |
372 | char *concatenated_name | |
373 | = alloca (strlen (namespace) + 2 + strlen (name) + 1); | |
374 | strcpy (concatenated_name, namespace); | |
375 | strcat (concatenated_name, "::"); | |
376 | strcat (concatenated_name, name); | |
377 | sym = lookup_symbol_file (concatenated_name, linkage_name, | |
21b556f4 | 378 | block, domain, |
1fcb5155 DC |
379 | cp_is_anonymous (namespace)); |
380 | return sym; | |
381 | } | |
382 | } | |
383 | ||
384 | /* Look up NAME in BLOCK's static block and in global blocks. If | |
385 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located | |
386 | within an anonymous namespace. Other arguments are as in | |
387 | cp_lookup_symbol_nonlocal. */ | |
388 | ||
389 | static struct symbol * | |
390 | lookup_symbol_file (const char *name, | |
391 | const char *linkage_name, | |
392 | const struct block *block, | |
393 | const domain_enum domain, | |
1fcb5155 DC |
394 | int anonymous_namespace) |
395 | { | |
396 | struct symbol *sym = NULL; | |
397 | ||
21b556f4 | 398 | sym = lookup_symbol_static (name, linkage_name, block, domain); |
1fcb5155 DC |
399 | if (sym != NULL) |
400 | return sym; | |
401 | ||
402 | if (anonymous_namespace) | |
403 | { | |
404 | /* Symbols defined in anonymous namespaces have external linkage | |
405 | but should be treated as local to a single file nonetheless. | |
406 | So we only search the current file's global block. */ | |
407 | ||
408 | const struct block *global_block = block_global_block (block); | |
409 | ||
410 | if (global_block != NULL) | |
5c4e30ca | 411 | sym = lookup_symbol_aux_block (name, linkage_name, global_block, |
21b556f4 | 412 | domain); |
1fcb5155 DC |
413 | } |
414 | else | |
415 | { | |
21b556f4 | 416 | sym = lookup_symbol_global (name, linkage_name, block, domain); |
5c4e30ca DC |
417 | } |
418 | ||
419 | if (sym != NULL) | |
420 | return sym; | |
421 | ||
422 | /* Now call "lookup_possible_namespace_symbol". Symbols in here | |
423 | claim to be associated to namespaces, but this claim might be | |
424 | incorrect: the names in question might actually correspond to | |
425 | classes instead of namespaces. But if they correspond to | |
426 | classes, then we should have found a match for them above. So if | |
427 | we find them now, they should be genuine. */ | |
428 | ||
429 | /* FIXME: carlton/2003-06-12: This is a hack and should eventually | |
430 | be deleted: see comments below. */ | |
431 | ||
432 | if (domain == VAR_DOMAIN) | |
433 | { | |
21b556f4 | 434 | sym = lookup_possible_namespace_symbol (name); |
5c4e30ca DC |
435 | if (sym != NULL) |
436 | return sym; | |
437 | } | |
438 | ||
439 | return NULL; | |
440 | } | |
441 | ||
79c2c32d DC |
442 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
443 | class or namespace given by PARENT_TYPE, from within the context | |
444 | given by BLOCK. Return NULL if there is no such nested type. */ | |
445 | ||
79c2c32d DC |
446 | struct type * |
447 | cp_lookup_nested_type (struct type *parent_type, | |
448 | const char *nested_name, | |
449 | const struct block *block) | |
450 | { | |
451 | switch (TYPE_CODE (parent_type)) | |
452 | { | |
63d06c5c | 453 | case TYPE_CODE_STRUCT: |
79c2c32d DC |
454 | case TYPE_CODE_NAMESPACE: |
455 | { | |
63d06c5c DC |
456 | /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
457 | of classes like, say, data or function members. Instead, | |
458 | they're just represented by symbols whose names are | |
459 | qualified by the name of the surrounding class. This is | |
460 | just like members of namespaces; in particular, | |
461 | lookup_symbol_namespace works when looking them up. */ | |
462 | ||
79c2c32d DC |
463 | const char *parent_name = TYPE_TAG_NAME (parent_type); |
464 | struct symbol *sym = cp_lookup_symbol_namespace (parent_name, | |
465 | nested_name, | |
466 | NULL, | |
467 | block, | |
21b556f4 | 468 | VAR_DOMAIN); |
79c2c32d DC |
469 | if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF) |
470 | return NULL; | |
471 | else | |
472 | return SYMBOL_TYPE (sym); | |
473 | } | |
474 | default: | |
475 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 476 | _("cp_lookup_nested_type called on a non-aggregate type.")); |
79c2c32d DC |
477 | } |
478 | } | |
479 | ||
b368761e DC |
480 | /* The C++-version of lookup_transparent_type. */ |
481 | ||
482 | /* FIXME: carlton/2004-01-16: The problem that this is trying to | |
483 | address is that, unfortunately, sometimes NAME is wrong: it may not | |
484 | include the name of namespaces enclosing the type in question. | |
485 | lookup_transparent_type gets called when the the type in question | |
486 | is a declaration, and we're trying to find its definition; but, for | |
487 | declarations, our type name deduction mechanism doesn't work. | |
488 | There's nothing we can do to fix this in general, I think, in the | |
489 | absence of debug information about namespaces (I've filed PR | |
490 | gdb/1511 about this); until such debug information becomes more | |
491 | prevalent, one heuristic which sometimes looks is to search for the | |
492 | definition in namespaces containing the current namespace. | |
493 | ||
494 | We should delete this functions once the appropriate debug | |
495 | information becomes more widespread. (GCC 3.4 will be the first | |
496 | released version of GCC with such information.) */ | |
497 | ||
498 | struct type * | |
499 | cp_lookup_transparent_type (const char *name) | |
500 | { | |
501 | /* First, try the honest way of looking up the definition. */ | |
502 | struct type *t = basic_lookup_transparent_type (name); | |
503 | const char *scope; | |
504 | ||
505 | if (t != NULL) | |
506 | return t; | |
507 | ||
508 | /* If that doesn't work and we're within a namespace, look there | |
509 | instead. */ | |
510 | scope = block_scope (get_selected_block (0)); | |
511 | ||
512 | if (scope[0] == '\0') | |
513 | return NULL; | |
514 | ||
515 | return cp_lookup_transparent_type_loop (name, scope, 0); | |
516 | } | |
517 | ||
518 | /* Lookup the the type definition associated to NAME in | |
519 | namespaces/classes containing SCOPE whose name is strictly longer | |
520 | than LENGTH. LENGTH must be the index of the start of a | |
521 | component of SCOPE. */ | |
522 | ||
523 | static struct type * | |
524 | cp_lookup_transparent_type_loop (const char *name, const char *scope, | |
525 | int length) | |
526 | { | |
1198ecbe | 527 | int scope_length = length + cp_find_first_component (scope + length); |
b368761e DC |
528 | char *full_name; |
529 | ||
530 | /* If the current scope is followed by "::", look in the next | |
531 | component. */ | |
532 | if (scope[scope_length] == ':') | |
533 | { | |
534 | struct type *retval | |
535 | = cp_lookup_transparent_type_loop (name, scope, scope_length + 2); | |
536 | if (retval != NULL) | |
537 | return retval; | |
538 | } | |
539 | ||
540 | full_name = alloca (scope_length + 2 + strlen (name) + 1); | |
541 | strncpy (full_name, scope, scope_length); | |
542 | strncpy (full_name + scope_length, "::", 2); | |
543 | strcpy (full_name + scope_length + 2, name); | |
544 | ||
545 | return basic_lookup_transparent_type (full_name); | |
546 | } | |
547 | ||
5c4e30ca DC |
548 | /* Now come functions for dealing with symbols associated to |
549 | namespaces. (They're used to store the namespaces themselves, not | |
550 | objects that live in the namespaces.) These symbols come in two | |
551 | varieties: if we run into a DW_TAG_namespace DIE, then we know that | |
552 | we have a namespace, so dwarf2read.c creates a symbol for it just | |
553 | like normal. But, unfortunately, versions of GCC through at least | |
554 | 3.3 don't generate those DIE's. Our solution is to try to guess | |
555 | their existence by looking at demangled names. This might cause us | |
556 | to misidentify classes as namespaces, however. So we put those | |
557 | symbols in a special block (one per objfile), and we only search | |
558 | that block as a last resort. */ | |
559 | ||
560 | /* FIXME: carlton/2003-06-12: Once versions of GCC that generate | |
561 | DW_TAG_namespace have been out for a year or two, we should get rid | |
562 | of all of this "possible namespace" nonsense. */ | |
563 | ||
564 | /* Allocate everything necessary for the possible namespace block | |
565 | associated to OBJFILE. */ | |
566 | ||
567 | static void | |
568 | initialize_namespace_symtab (struct objfile *objfile) | |
569 | { | |
570 | struct symtab *namespace_symtab; | |
571 | struct blockvector *bv; | |
572 | struct block *bl; | |
573 | ||
574 | namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); | |
575 | namespace_symtab->language = language_cplus; | |
576 | namespace_symtab->free_code = free_nothing; | |
577 | namespace_symtab->dirname = NULL; | |
578 | ||
4a146b47 | 579 | bv = obstack_alloc (&objfile->objfile_obstack, |
5c4e30ca DC |
580 | sizeof (struct blockvector) |
581 | + FIRST_LOCAL_BLOCK * sizeof (struct block *)); | |
582 | BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; | |
583 | BLOCKVECTOR (namespace_symtab) = bv; | |
584 | ||
585 | /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ | |
586 | ||
4a146b47 EZ |
587 | bl = allocate_block (&objfile->objfile_obstack); |
588 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
589 | NULL); |
590 | BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; | |
4a146b47 EZ |
591 | bl = allocate_block (&objfile->objfile_obstack); |
592 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
593 | NULL); |
594 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; | |
595 | ||
596 | /* Allocate the possible namespace block; we put it where the first | |
597 | local block will live, though I don't think there's any need to | |
598 | pretend that it's actually a local block (e.g. by setting | |
599 | BLOCK_SUPERBLOCK appropriately). We don't use the global or | |
600 | static block because we don't want it searched during the normal | |
601 | search of all global/static blocks in lookup_symbol: we only want | |
602 | it used as a last resort. */ | |
603 | ||
604 | /* NOTE: carlton/2003-09-11: I considered not associating the fake | |
605 | symbols to a block/symtab at all. But that would cause problems | |
606 | with lookup_symbol's SYMTAB argument and with block_found, so | |
607 | having a symtab/block for this purpose seems like the best | |
608 | solution for now. */ | |
609 | ||
4a146b47 | 610 | bl = allocate_block (&objfile->objfile_obstack); |
5c4e30ca DC |
611 | BLOCK_DICT (bl) = dict_create_hashed_expandable (); |
612 | BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; | |
613 | ||
614 | namespace_symtab->free_func = free_namespace_block; | |
615 | ||
616 | objfile->cp_namespace_symtab = namespace_symtab; | |
617 | } | |
618 | ||
619 | /* Locate the possible namespace block associated to OBJFILE, | |
620 | allocating it if necessary. */ | |
621 | ||
622 | static struct block * | |
623 | get_possible_namespace_block (struct objfile *objfile) | |
624 | { | |
625 | if (objfile->cp_namespace_symtab == NULL) | |
626 | initialize_namespace_symtab (objfile); | |
627 | ||
628 | return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), | |
629 | FIRST_LOCAL_BLOCK); | |
630 | } | |
631 | ||
632 | /* Free the dictionary associated to the possible namespace block. */ | |
633 | ||
634 | static void | |
635 | free_namespace_block (struct symtab *symtab) | |
636 | { | |
637 | struct block *possible_namespace_block; | |
638 | ||
639 | possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), | |
640 | FIRST_LOCAL_BLOCK); | |
641 | gdb_assert (possible_namespace_block != NULL); | |
642 | dict_free (BLOCK_DICT (possible_namespace_block)); | |
643 | } | |
644 | ||
645 | /* Ensure that there are symbols in the possible namespace block | |
646 | associated to OBJFILE for all initial substrings of NAME that look | |
647 | like namespaces or classes. NAME should end in a member variable: | |
648 | it shouldn't consist solely of namespaces. */ | |
649 | ||
650 | void | |
651 | cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) | |
652 | { | |
653 | check_possible_namespace_symbols_loop (name, | |
654 | cp_find_first_component (name), | |
655 | objfile); | |
656 | } | |
657 | ||
658 | /* This is a helper loop for cp_check_possible_namespace_symbols; it | |
659 | ensures that there are symbols in the possible namespace block | |
660 | associated to OBJFILE for all namespaces that are initial | |
661 | substrings of NAME of length at least LEN. It returns 1 if a | |
662 | previous loop had already created the shortest such symbol and 0 | |
663 | otherwise. | |
664 | ||
665 | This function assumes that if there is already a symbol associated | |
666 | to a substring of NAME of a given length, then there are already | |
667 | symbols associated to all substrings of NAME whose length is less | |
668 | than that length. So if cp_check_possible_namespace_symbols has | |
669 | been called once with argument "A::B::C::member", then that will | |
670 | create symbols "A", "A::B", and "A::B::C". If it is then later | |
671 | called with argument "A::B::D::member", then the new call will | |
672 | generate a new symbol for "A::B::D", but once it sees that "A::B" | |
673 | has already been created, it doesn't bother checking to see if "A" | |
674 | has also been created. */ | |
675 | ||
676 | static int | |
677 | check_possible_namespace_symbols_loop (const char *name, int len, | |
678 | struct objfile *objfile) | |
679 | { | |
680 | if (name[len] == ':') | |
681 | { | |
682 | int done; | |
683 | int next_len = len + 2; | |
684 | ||
685 | next_len += cp_find_first_component (name + next_len); | |
686 | done = check_possible_namespace_symbols_loop (name, next_len, | |
687 | objfile); | |
688 | ||
689 | if (!done) | |
690 | done = check_one_possible_namespace_symbol (name, len, objfile); | |
691 | ||
692 | return done; | |
1fcb5155 | 693 | } |
5c4e30ca DC |
694 | else |
695 | return 0; | |
696 | } | |
697 | ||
698 | /* Check to see if there's already a possible namespace symbol in | |
699 | OBJFILE whose name is the initial substring of NAME of length LEN. | |
700 | If not, create one and return 0; otherwise, return 1. */ | |
701 | ||
702 | static int | |
703 | check_one_possible_namespace_symbol (const char *name, int len, | |
704 | struct objfile *objfile) | |
705 | { | |
706 | struct block *block = get_possible_namespace_block (objfile); | |
ec5cdd75 DJ |
707 | char *name_copy = alloca (len + 1); |
708 | struct symbol *sym; | |
709 | ||
710 | memcpy (name_copy, name, len); | |
711 | name_copy[len] = '\0'; | |
712 | sym = lookup_block_symbol (block, name_copy, NULL, VAR_DOMAIN); | |
5c4e30ca DC |
713 | |
714 | if (sym == NULL) | |
715 | { | |
ec5cdd75 | 716 | struct type *type; |
ec5cdd75 DJ |
717 | |
718 | type = init_type (TYPE_CODE_NAMESPACE, 0, 0, name_copy, objfile); | |
719 | ||
5c4e30ca DC |
720 | TYPE_TAG_NAME (type) = TYPE_NAME (type); |
721 | ||
4a146b47 | 722 | sym = obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); |
5c4e30ca DC |
723 | memset (sym, 0, sizeof (struct symbol)); |
724 | SYMBOL_LANGUAGE (sym) = language_cplus; | |
04a679b8 TT |
725 | /* Note that init_type copied the name to the objfile's |
726 | obstack. */ | |
727 | SYMBOL_SET_NAMES (sym, TYPE_NAME (type), len, 0, objfile); | |
5c4e30ca DC |
728 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; |
729 | SYMBOL_TYPE (sym) = type; | |
730 | SYMBOL_DOMAIN (sym) = VAR_DOMAIN; | |
731 | ||
732 | dict_add_symbol (BLOCK_DICT (block), sym); | |
733 | ||
734 | return 0; | |
735 | } | |
736 | else | |
ec5cdd75 | 737 | return 1; |
5c4e30ca DC |
738 | } |
739 | ||
740 | /* Look for a symbol named NAME in all the possible namespace blocks. | |
21b556f4 | 741 | If one is found, return it. */ |
5c4e30ca DC |
742 | |
743 | static struct symbol * | |
21b556f4 | 744 | lookup_possible_namespace_symbol (const char *name) |
5c4e30ca DC |
745 | { |
746 | struct objfile *objfile; | |
747 | ||
748 | ALL_OBJFILES (objfile) | |
749 | { | |
750 | struct symbol *sym; | |
751 | ||
752 | sym = lookup_block_symbol (get_possible_namespace_block (objfile), | |
753 | name, NULL, VAR_DOMAIN); | |
754 | ||
755 | if (sym != NULL) | |
21b556f4 | 756 | return sym; |
5c4e30ca DC |
757 | } |
758 | ||
759 | return NULL; | |
760 | } | |
761 | ||
762 | /* Print out all the possible namespace symbols. */ | |
763 | ||
764 | static void | |
765 | maintenance_cplus_namespace (char *args, int from_tty) | |
766 | { | |
767 | struct objfile *objfile; | |
a3f17187 | 768 | printf_unfiltered (_("Possible namespaces:\n")); |
5c4e30ca DC |
769 | ALL_OBJFILES (objfile) |
770 | { | |
771 | struct dict_iterator iter; | |
772 | struct symbol *sym; | |
773 | ||
774 | ALL_BLOCK_SYMBOLS (get_possible_namespace_block (objfile), iter, sym) | |
775 | { | |
776 | printf_unfiltered ("%s\n", SYMBOL_PRINT_NAME (sym)); | |
777 | } | |
778 | } | |
779 | } | |
780 | ||
2c0b251b PA |
781 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
782 | extern initialize_file_ftype _initialize_cp_namespace; | |
783 | ||
5c4e30ca DC |
784 | void |
785 | _initialize_cp_namespace (void) | |
786 | { | |
787 | add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, | |
1a966eab | 788 | _("Print the list of possible C++ namespaces."), |
5c4e30ca | 789 | &maint_cplus_cmd_list); |
1fcb5155 | 790 | } |