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9219021c | 1 | /* Helper routines for C++ support in GDB. |
4c38e0a4 JB |
2 | Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010 |
3 | Free Software Foundation, Inc. | |
9219021c | 4 | |
1fcb5155 | 5 | Contributed by David Carlton and by Kealia, Inc. |
9219021c DC |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
9219021c DC |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
9219021c DC |
21 | |
22 | #include "defs.h" | |
23 | #include "cp-support.h" | |
24 | #include "gdb_obstack.h" | |
25 | #include "symtab.h" | |
26 | #include "symfile.h" | |
27 | #include "gdb_assert.h" | |
28 | #include "block.h" | |
5c4e30ca DC |
29 | #include "objfiles.h" |
30 | #include "gdbtypes.h" | |
31 | #include "dictionary.h" | |
32 | #include "command.h" | |
b368761e | 33 | #include "frame.h" |
27aa8d6a | 34 | #include "buildsym.h" |
9219021c DC |
35 | |
36 | static struct using_direct *cp_copy_usings (struct using_direct *using, | |
37 | struct obstack *obstack); | |
38 | ||
1fcb5155 DC |
39 | static struct symbol *lookup_namespace_scope (const char *name, |
40 | const char *linkage_name, | |
41 | const struct block *block, | |
42 | const domain_enum domain, | |
1fcb5155 DC |
43 | const char *scope, |
44 | int scope_len); | |
45 | ||
46 | static struct symbol *lookup_symbol_file (const char *name, | |
47 | const char *linkage_name, | |
48 | const struct block *block, | |
49 | const domain_enum domain, | |
1fcb5155 DC |
50 | int anonymous_namespace); |
51 | ||
b368761e DC |
52 | static struct type *cp_lookup_transparent_type_loop (const char *name, |
53 | const char *scope, | |
54 | int scope_len); | |
55 | ||
5c4e30ca DC |
56 | static void initialize_namespace_symtab (struct objfile *objfile); |
57 | ||
58 | static struct block *get_possible_namespace_block (struct objfile *objfile); | |
59 | ||
60 | static void free_namespace_block (struct symtab *symtab); | |
61 | ||
62 | static int check_possible_namespace_symbols_loop (const char *name, | |
63 | int len, | |
64 | struct objfile *objfile); | |
65 | ||
66 | static int check_one_possible_namespace_symbol (const char *name, | |
67 | int len, | |
68 | struct objfile *objfile); | |
69 | ||
21b556f4 | 70 | static struct symbol *lookup_possible_namespace_symbol (const char *name); |
5c4e30ca DC |
71 | |
72 | static void maintenance_cplus_namespace (char *args, int from_tty); | |
73 | ||
9219021c DC |
74 | /* Check to see if SYMBOL refers to an object contained within an |
75 | anonymous namespace; if so, add an appropriate using directive. */ | |
76 | ||
77 | /* Optimize away strlen ("(anonymous namespace)"). */ | |
78 | ||
79 | #define ANONYMOUS_NAMESPACE_LEN 21 | |
80 | ||
81 | void | |
82 | cp_scan_for_anonymous_namespaces (const struct symbol *symbol) | |
83 | { | |
df8a16a1 | 84 | if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
9219021c | 85 | { |
df8a16a1 | 86 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
9219021c DC |
87 | unsigned int previous_component; |
88 | unsigned int next_component; | |
89 | const char *len; | |
90 | ||
91 | /* Start with a quick-and-dirty check for mention of "(anonymous | |
92 | namespace)". */ | |
93 | ||
94 | if (!cp_is_anonymous (name)) | |
95 | return; | |
96 | ||
97 | previous_component = 0; | |
98 | next_component = cp_find_first_component (name + previous_component); | |
99 | ||
100 | while (name[next_component] == ':') | |
101 | { | |
102 | if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN | |
103 | && strncmp (name + previous_component, | |
104 | "(anonymous namespace)", | |
105 | ANONYMOUS_NAMESPACE_LEN) == 0) | |
106 | { | |
8c902bb1 SW |
107 | int dest_len = (previous_component == 0 ? 0 : previous_component - 2); |
108 | int src_len = next_component; | |
794684b6 | 109 | |
8c902bb1 SW |
110 | char *dest = alloca (dest_len + 1); |
111 | char *src = alloca (src_len + 1); | |
794684b6 | 112 | |
8c902bb1 SW |
113 | memcpy (dest, name, dest_len); |
114 | memcpy (src, name, src_len); | |
794684b6 | 115 | |
8c902bb1 SW |
116 | dest[dest_len] = '\0'; |
117 | src[src_len] = '\0'; | |
794684b6 | 118 | |
9219021c DC |
119 | /* We've found a component of the name that's an |
120 | anonymous namespace. So add symbols in it to the | |
121 | namespace given by the previous component if there is | |
122 | one, or to the global namespace if there isn't. */ | |
8c902bb1 | 123 | cp_add_using_directive (dest, src); |
9219021c DC |
124 | } |
125 | /* The "+ 2" is for the "::". */ | |
126 | previous_component = next_component + 2; | |
127 | next_component = (previous_component | |
128 | + cp_find_first_component (name | |
129 | + previous_component)); | |
130 | } | |
131 | } | |
132 | } | |
133 | ||
794684b6 SW |
134 | /* Add a using directive to using_list. If the using directive in question |
135 | has already been added, don't add it twice. */ | |
9219021c DC |
136 | |
137 | void | |
8c902bb1 | 138 | cp_add_using_directive (const char *dest, const char *src) |
9219021c DC |
139 | { |
140 | struct using_direct *current; | |
141 | struct using_direct *new; | |
142 | ||
143 | /* Has it already been added? */ | |
144 | ||
27aa8d6a | 145 | for (current = using_directives; current != NULL; current = current->next) |
9219021c | 146 | { |
8c902bb1 SW |
147 | if (strcmp (current->import_src, src) == 0 |
148 | && strcmp (current->import_dest, dest) == 0) | |
9219021c DC |
149 | return; |
150 | } | |
151 | ||
8c902bb1 | 152 | using_directives = cp_add_using (dest, src, using_directives); |
794684b6 | 153 | |
9219021c DC |
154 | } |
155 | ||
156 | /* Record the namespace that the function defined by SYMBOL was | |
157 | defined in, if necessary. BLOCK is the associated block; use | |
158 | OBSTACK for allocation. */ | |
159 | ||
160 | void | |
161 | cp_set_block_scope (const struct symbol *symbol, | |
162 | struct block *block, | |
df8a16a1 DJ |
163 | struct obstack *obstack, |
164 | const char *processing_current_prefix, | |
165 | int processing_has_namespace_info) | |
9219021c | 166 | { |
df8a16a1 | 167 | if (processing_has_namespace_info) |
9219021c | 168 | { |
df8a16a1 DJ |
169 | block_set_scope |
170 | (block, obsavestring (processing_current_prefix, | |
171 | strlen (processing_current_prefix), | |
172 | obstack), | |
173 | obstack); | |
174 | } | |
175 | else if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) | |
176 | { | |
177 | /* Try to figure out the appropriate namespace from the | |
178 | demangled name. */ | |
9219021c | 179 | |
df8a16a1 DJ |
180 | /* FIXME: carlton/2003-04-15: If the function in question is |
181 | a method of a class, the name will actually include the | |
182 | name of the class as well. This should be harmless, but | |
183 | is a little unfortunate. */ | |
9219021c | 184 | |
df8a16a1 DJ |
185 | const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
186 | unsigned int prefix_len = cp_entire_prefix_len (name); | |
9219021c | 187 | |
df8a16a1 DJ |
188 | block_set_scope (block, |
189 | obsavestring (name, prefix_len, obstack), | |
190 | obstack); | |
9219021c DC |
191 | } |
192 | } | |
193 | ||
194 | /* Test whether or not NAMESPACE looks like it mentions an anonymous | |
195 | namespace; return nonzero if so. */ | |
196 | ||
197 | int | |
198 | cp_is_anonymous (const char *namespace) | |
199 | { | |
200 | return (strstr (namespace, "(anonymous namespace)") | |
201 | != NULL); | |
202 | } | |
203 | ||
8c902bb1 SW |
204 | /* Create a new struct using direct which imports the namespace SRC |
205 | into the scope DEST. | |
9219021c DC |
206 | Set its next member in the linked list to NEXT; allocate all memory |
207 | using xmalloc. It copies the strings, so NAME can be a temporary | |
208 | string. */ | |
209 | ||
27aa8d6a | 210 | struct using_direct * |
8c902bb1 SW |
211 | cp_add_using (const char *dest, |
212 | const char *src, | |
9219021c DC |
213 | struct using_direct *next) |
214 | { | |
215 | struct using_direct *retval; | |
216 | ||
9219021c | 217 | retval = xmalloc (sizeof (struct using_direct)); |
8c902bb1 SW |
218 | retval->import_src = savestring (src, strlen(src)); |
219 | retval->import_dest = savestring (dest, strlen(dest)); | |
9219021c DC |
220 | retval->next = next; |
221 | ||
222 | return retval; | |
223 | } | |
224 | ||
225 | /* Make a copy of the using directives in the list pointed to by | |
226 | USING, using OBSTACK to allocate memory. Free all memory pointed | |
227 | to by USING via xfree. */ | |
228 | ||
229 | static struct using_direct * | |
230 | cp_copy_usings (struct using_direct *using, | |
231 | struct obstack *obstack) | |
232 | { | |
233 | if (using == NULL) | |
234 | { | |
235 | return NULL; | |
236 | } | |
237 | else | |
238 | { | |
239 | struct using_direct *retval | |
240 | = obstack_alloc (obstack, sizeof (struct using_direct)); | |
8c902bb1 | 241 | retval->import_src = obsavestring (using->import_src, strlen (using->import_src), |
9219021c | 242 | obstack); |
8c902bb1 | 243 | retval->import_dest = obsavestring (using->import_dest, strlen (using->import_dest), |
9219021c DC |
244 | obstack); |
245 | retval->next = cp_copy_usings (using->next, obstack); | |
246 | ||
8c902bb1 SW |
247 | xfree (using->import_src); |
248 | xfree (using->import_dest); | |
9219021c DC |
249 | xfree (using); |
250 | ||
251 | return retval; | |
252 | } | |
253 | } | |
1fcb5155 DC |
254 | |
255 | /* The C++-specific version of name lookup for static and global | |
256 | names. This makes sure that names get looked for in all namespaces | |
257 | that are in scope. NAME is the natural name of the symbol that | |
258 | we're looking for, LINKAGE_NAME (which is optional) is its linkage | |
259 | name, BLOCK is the block that we're searching within, DOMAIN says | |
260 | what kind of symbols we're looking for, and if SYMTAB is non-NULL, | |
261 | we should store the symtab where we found the symbol in it. */ | |
262 | ||
263 | struct symbol * | |
264 | cp_lookup_symbol_nonlocal (const char *name, | |
265 | const char *linkage_name, | |
266 | const struct block *block, | |
21b556f4 | 267 | const domain_enum domain) |
1fcb5155 DC |
268 | { |
269 | return lookup_namespace_scope (name, linkage_name, block, domain, | |
21b556f4 | 270 | block_scope (block), 0); |
1fcb5155 DC |
271 | } |
272 | ||
273 | /* Lookup NAME at namespace scope (or, in C terms, in static and | |
274 | global variables). SCOPE is the namespace that the current | |
275 | function is defined within; only consider namespaces whose length | |
276 | is at least SCOPE_LEN. Other arguments are as in | |
277 | cp_lookup_symbol_nonlocal. | |
278 | ||
279 | For example, if we're within a function A::B::f and looking for a | |
3882f37a | 280 | symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
1fcb5155 DC |
281 | SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
282 | but with SCOPE_LEN = 1. And then it calls itself with NAME and | |
283 | SCOPE the same, but with SCOPE_LEN = 4. This third call looks for | |
284 | "A::B::x"; if it doesn't find it, then the second call looks for | |
285 | "A::x", and if that call fails, then the first call looks for | |
286 | "x". */ | |
287 | ||
288 | static struct symbol * | |
289 | lookup_namespace_scope (const char *name, | |
290 | const char *linkage_name, | |
291 | const struct block *block, | |
292 | const domain_enum domain, | |
1fcb5155 DC |
293 | const char *scope, |
294 | int scope_len) | |
295 | { | |
296 | char *namespace; | |
297 | ||
298 | if (scope[scope_len] != '\0') | |
299 | { | |
300 | /* Recursively search for names in child namespaces first. */ | |
301 | ||
302 | struct symbol *sym; | |
303 | int new_scope_len = scope_len; | |
304 | ||
305 | /* If the current scope is followed by "::", skip past that. */ | |
306 | if (new_scope_len != 0) | |
307 | { | |
308 | gdb_assert (scope[new_scope_len] == ':'); | |
309 | new_scope_len += 2; | |
310 | } | |
311 | new_scope_len += cp_find_first_component (scope + new_scope_len); | |
312 | sym = lookup_namespace_scope (name, linkage_name, block, | |
21b556f4 | 313 | domain, scope, new_scope_len); |
1fcb5155 DC |
314 | if (sym != NULL) |
315 | return sym; | |
316 | } | |
317 | ||
318 | /* Okay, we didn't find a match in our children, so look for the | |
319 | name in the current namespace. */ | |
320 | ||
321 | namespace = alloca (scope_len + 1); | |
322 | strncpy (namespace, scope, scope_len); | |
323 | namespace[scope_len] = '\0'; | |
324 | return cp_lookup_symbol_namespace (namespace, name, linkage_name, | |
21b556f4 | 325 | block, domain); |
1fcb5155 DC |
326 | } |
327 | ||
328 | /* Look up NAME in the C++ namespace NAMESPACE, applying the using | |
329 | directives that are active in BLOCK. Other arguments are as in | |
330 | cp_lookup_symbol_nonlocal. */ | |
331 | ||
332 | struct symbol * | |
333 | cp_lookup_symbol_namespace (const char *namespace, | |
334 | const char *name, | |
335 | const char *linkage_name, | |
336 | const struct block *block, | |
21b556f4 | 337 | const domain_enum domain) |
1fcb5155 DC |
338 | { |
339 | const struct using_direct *current; | |
340 | struct symbol *sym; | |
341 | ||
342 | /* First, go through the using directives. If any of them add new | |
343 | names to the namespace we're searching in, see if we can find a | |
344 | match by applying them. */ | |
345 | ||
346 | for (current = block_using (block); | |
347 | current != NULL; | |
348 | current = current->next) | |
349 | { | |
8c902bb1 | 350 | if (strcmp (namespace, current->import_dest) == 0) |
1fcb5155 | 351 | { |
8c902bb1 | 352 | sym = cp_lookup_symbol_namespace (current->import_src, |
1fcb5155 DC |
353 | name, |
354 | linkage_name, | |
355 | block, | |
21b556f4 | 356 | domain); |
1fcb5155 DC |
357 | if (sym != NULL) |
358 | return sym; | |
359 | } | |
360 | } | |
361 | ||
362 | /* We didn't find anything by applying any of the using directives | |
363 | that are still applicable; so let's see if we've got a match | |
364 | using the current namespace. */ | |
365 | ||
366 | if (namespace[0] == '\0') | |
367 | { | |
368 | return lookup_symbol_file (name, linkage_name, block, | |
21b556f4 | 369 | domain, 0); |
1fcb5155 DC |
370 | } |
371 | else | |
372 | { | |
373 | char *concatenated_name | |
374 | = alloca (strlen (namespace) + 2 + strlen (name) + 1); | |
375 | strcpy (concatenated_name, namespace); | |
376 | strcat (concatenated_name, "::"); | |
377 | strcat (concatenated_name, name); | |
378 | sym = lookup_symbol_file (concatenated_name, linkage_name, | |
21b556f4 | 379 | block, domain, |
1fcb5155 DC |
380 | cp_is_anonymous (namespace)); |
381 | return sym; | |
382 | } | |
383 | } | |
384 | ||
385 | /* Look up NAME in BLOCK's static block and in global blocks. If | |
386 | ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located | |
387 | within an anonymous namespace. Other arguments are as in | |
388 | cp_lookup_symbol_nonlocal. */ | |
389 | ||
390 | static struct symbol * | |
391 | lookup_symbol_file (const char *name, | |
392 | const char *linkage_name, | |
393 | const struct block *block, | |
394 | const domain_enum domain, | |
1fcb5155 DC |
395 | int anonymous_namespace) |
396 | { | |
397 | struct symbol *sym = NULL; | |
398 | ||
21b556f4 | 399 | sym = lookup_symbol_static (name, linkage_name, block, domain); |
1fcb5155 DC |
400 | if (sym != NULL) |
401 | return sym; | |
402 | ||
403 | if (anonymous_namespace) | |
404 | { | |
405 | /* Symbols defined in anonymous namespaces have external linkage | |
406 | but should be treated as local to a single file nonetheless. | |
407 | So we only search the current file's global block. */ | |
408 | ||
409 | const struct block *global_block = block_global_block (block); | |
410 | ||
411 | if (global_block != NULL) | |
5c4e30ca | 412 | sym = lookup_symbol_aux_block (name, linkage_name, global_block, |
21b556f4 | 413 | domain); |
1fcb5155 DC |
414 | } |
415 | else | |
416 | { | |
21b556f4 | 417 | sym = lookup_symbol_global (name, linkage_name, block, domain); |
5c4e30ca DC |
418 | } |
419 | ||
420 | if (sym != NULL) | |
421 | return sym; | |
422 | ||
423 | /* Now call "lookup_possible_namespace_symbol". Symbols in here | |
424 | claim to be associated to namespaces, but this claim might be | |
425 | incorrect: the names in question might actually correspond to | |
426 | classes instead of namespaces. But if they correspond to | |
427 | classes, then we should have found a match for them above. So if | |
428 | we find them now, they should be genuine. */ | |
429 | ||
430 | /* FIXME: carlton/2003-06-12: This is a hack and should eventually | |
431 | be deleted: see comments below. */ | |
432 | ||
433 | if (domain == VAR_DOMAIN) | |
434 | { | |
21b556f4 | 435 | sym = lookup_possible_namespace_symbol (name); |
5c4e30ca DC |
436 | if (sym != NULL) |
437 | return sym; | |
438 | } | |
439 | ||
440 | return NULL; | |
441 | } | |
442 | ||
79c2c32d DC |
443 | /* Look up a type named NESTED_NAME that is nested inside the C++ |
444 | class or namespace given by PARENT_TYPE, from within the context | |
445 | given by BLOCK. Return NULL if there is no such nested type. */ | |
446 | ||
79c2c32d DC |
447 | struct type * |
448 | cp_lookup_nested_type (struct type *parent_type, | |
449 | const char *nested_name, | |
450 | const struct block *block) | |
451 | { | |
452 | switch (TYPE_CODE (parent_type)) | |
453 | { | |
63d06c5c | 454 | case TYPE_CODE_STRUCT: |
79c2c32d DC |
455 | case TYPE_CODE_NAMESPACE: |
456 | { | |
63d06c5c DC |
457 | /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
458 | of classes like, say, data or function members. Instead, | |
459 | they're just represented by symbols whose names are | |
460 | qualified by the name of the surrounding class. This is | |
461 | just like members of namespaces; in particular, | |
462 | lookup_symbol_namespace works when looking them up. */ | |
463 | ||
79c2c32d DC |
464 | const char *parent_name = TYPE_TAG_NAME (parent_type); |
465 | struct symbol *sym = cp_lookup_symbol_namespace (parent_name, | |
466 | nested_name, | |
467 | NULL, | |
468 | block, | |
21b556f4 | 469 | VAR_DOMAIN); |
79c2c32d DC |
470 | if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF) |
471 | return NULL; | |
472 | else | |
473 | return SYMBOL_TYPE (sym); | |
474 | } | |
475 | default: | |
476 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 477 | _("cp_lookup_nested_type called on a non-aggregate type.")); |
79c2c32d DC |
478 | } |
479 | } | |
480 | ||
b368761e DC |
481 | /* The C++-version of lookup_transparent_type. */ |
482 | ||
483 | /* FIXME: carlton/2004-01-16: The problem that this is trying to | |
484 | address is that, unfortunately, sometimes NAME is wrong: it may not | |
485 | include the name of namespaces enclosing the type in question. | |
486 | lookup_transparent_type gets called when the the type in question | |
487 | is a declaration, and we're trying to find its definition; but, for | |
488 | declarations, our type name deduction mechanism doesn't work. | |
489 | There's nothing we can do to fix this in general, I think, in the | |
490 | absence of debug information about namespaces (I've filed PR | |
491 | gdb/1511 about this); until such debug information becomes more | |
492 | prevalent, one heuristic which sometimes looks is to search for the | |
493 | definition in namespaces containing the current namespace. | |
494 | ||
495 | We should delete this functions once the appropriate debug | |
496 | information becomes more widespread. (GCC 3.4 will be the first | |
497 | released version of GCC with such information.) */ | |
498 | ||
499 | struct type * | |
500 | cp_lookup_transparent_type (const char *name) | |
501 | { | |
502 | /* First, try the honest way of looking up the definition. */ | |
503 | struct type *t = basic_lookup_transparent_type (name); | |
504 | const char *scope; | |
505 | ||
506 | if (t != NULL) | |
507 | return t; | |
508 | ||
509 | /* If that doesn't work and we're within a namespace, look there | |
510 | instead. */ | |
511 | scope = block_scope (get_selected_block (0)); | |
512 | ||
513 | if (scope[0] == '\0') | |
514 | return NULL; | |
515 | ||
516 | return cp_lookup_transparent_type_loop (name, scope, 0); | |
517 | } | |
518 | ||
519 | /* Lookup the the type definition associated to NAME in | |
520 | namespaces/classes containing SCOPE whose name is strictly longer | |
521 | than LENGTH. LENGTH must be the index of the start of a | |
522 | component of SCOPE. */ | |
523 | ||
524 | static struct type * | |
525 | cp_lookup_transparent_type_loop (const char *name, const char *scope, | |
526 | int length) | |
527 | { | |
1198ecbe | 528 | int scope_length = length + cp_find_first_component (scope + length); |
b368761e DC |
529 | char *full_name; |
530 | ||
531 | /* If the current scope is followed by "::", look in the next | |
532 | component. */ | |
533 | if (scope[scope_length] == ':') | |
534 | { | |
535 | struct type *retval | |
536 | = cp_lookup_transparent_type_loop (name, scope, scope_length + 2); | |
537 | if (retval != NULL) | |
538 | return retval; | |
539 | } | |
540 | ||
541 | full_name = alloca (scope_length + 2 + strlen (name) + 1); | |
542 | strncpy (full_name, scope, scope_length); | |
543 | strncpy (full_name + scope_length, "::", 2); | |
544 | strcpy (full_name + scope_length + 2, name); | |
545 | ||
546 | return basic_lookup_transparent_type (full_name); | |
547 | } | |
548 | ||
5c4e30ca DC |
549 | /* Now come functions for dealing with symbols associated to |
550 | namespaces. (They're used to store the namespaces themselves, not | |
551 | objects that live in the namespaces.) These symbols come in two | |
552 | varieties: if we run into a DW_TAG_namespace DIE, then we know that | |
553 | we have a namespace, so dwarf2read.c creates a symbol for it just | |
554 | like normal. But, unfortunately, versions of GCC through at least | |
555 | 3.3 don't generate those DIE's. Our solution is to try to guess | |
556 | their existence by looking at demangled names. This might cause us | |
557 | to misidentify classes as namespaces, however. So we put those | |
558 | symbols in a special block (one per objfile), and we only search | |
559 | that block as a last resort. */ | |
560 | ||
561 | /* FIXME: carlton/2003-06-12: Once versions of GCC that generate | |
562 | DW_TAG_namespace have been out for a year or two, we should get rid | |
563 | of all of this "possible namespace" nonsense. */ | |
564 | ||
565 | /* Allocate everything necessary for the possible namespace block | |
566 | associated to OBJFILE. */ | |
567 | ||
568 | static void | |
569 | initialize_namespace_symtab (struct objfile *objfile) | |
570 | { | |
571 | struct symtab *namespace_symtab; | |
572 | struct blockvector *bv; | |
573 | struct block *bl; | |
574 | ||
575 | namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); | |
576 | namespace_symtab->language = language_cplus; | |
577 | namespace_symtab->free_code = free_nothing; | |
578 | namespace_symtab->dirname = NULL; | |
579 | ||
4a146b47 | 580 | bv = obstack_alloc (&objfile->objfile_obstack, |
5c4e30ca DC |
581 | sizeof (struct blockvector) |
582 | + FIRST_LOCAL_BLOCK * sizeof (struct block *)); | |
583 | BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; | |
584 | BLOCKVECTOR (namespace_symtab) = bv; | |
585 | ||
586 | /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ | |
587 | ||
4a146b47 EZ |
588 | bl = allocate_block (&objfile->objfile_obstack); |
589 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
590 | NULL); |
591 | BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; | |
4a146b47 EZ |
592 | bl = allocate_block (&objfile->objfile_obstack); |
593 | BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, | |
5c4e30ca DC |
594 | NULL); |
595 | BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; | |
596 | ||
597 | /* Allocate the possible namespace block; we put it where the first | |
598 | local block will live, though I don't think there's any need to | |
599 | pretend that it's actually a local block (e.g. by setting | |
600 | BLOCK_SUPERBLOCK appropriately). We don't use the global or | |
601 | static block because we don't want it searched during the normal | |
602 | search of all global/static blocks in lookup_symbol: we only want | |
603 | it used as a last resort. */ | |
604 | ||
605 | /* NOTE: carlton/2003-09-11: I considered not associating the fake | |
606 | symbols to a block/symtab at all. But that would cause problems | |
607 | with lookup_symbol's SYMTAB argument and with block_found, so | |
608 | having a symtab/block for this purpose seems like the best | |
609 | solution for now. */ | |
610 | ||
4a146b47 | 611 | bl = allocate_block (&objfile->objfile_obstack); |
5c4e30ca DC |
612 | BLOCK_DICT (bl) = dict_create_hashed_expandable (); |
613 | BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; | |
614 | ||
615 | namespace_symtab->free_func = free_namespace_block; | |
616 | ||
617 | objfile->cp_namespace_symtab = namespace_symtab; | |
618 | } | |
619 | ||
620 | /* Locate the possible namespace block associated to OBJFILE, | |
621 | allocating it if necessary. */ | |
622 | ||
623 | static struct block * | |
624 | get_possible_namespace_block (struct objfile *objfile) | |
625 | { | |
626 | if (objfile->cp_namespace_symtab == NULL) | |
627 | initialize_namespace_symtab (objfile); | |
628 | ||
629 | return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), | |
630 | FIRST_LOCAL_BLOCK); | |
631 | } | |
632 | ||
633 | /* Free the dictionary associated to the possible namespace block. */ | |
634 | ||
635 | static void | |
636 | free_namespace_block (struct symtab *symtab) | |
637 | { | |
638 | struct block *possible_namespace_block; | |
639 | ||
640 | possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), | |
641 | FIRST_LOCAL_BLOCK); | |
642 | gdb_assert (possible_namespace_block != NULL); | |
643 | dict_free (BLOCK_DICT (possible_namespace_block)); | |
644 | } | |
645 | ||
646 | /* Ensure that there are symbols in the possible namespace block | |
647 | associated to OBJFILE for all initial substrings of NAME that look | |
648 | like namespaces or classes. NAME should end in a member variable: | |
649 | it shouldn't consist solely of namespaces. */ | |
650 | ||
651 | void | |
652 | cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) | |
653 | { | |
654 | check_possible_namespace_symbols_loop (name, | |
655 | cp_find_first_component (name), | |
656 | objfile); | |
657 | } | |
658 | ||
659 | /* This is a helper loop for cp_check_possible_namespace_symbols; it | |
660 | ensures that there are symbols in the possible namespace block | |
661 | associated to OBJFILE for all namespaces that are initial | |
662 | substrings of NAME of length at least LEN. It returns 1 if a | |
663 | previous loop had already created the shortest such symbol and 0 | |
664 | otherwise. | |
665 | ||
666 | This function assumes that if there is already a symbol associated | |
667 | to a substring of NAME of a given length, then there are already | |
668 | symbols associated to all substrings of NAME whose length is less | |
669 | than that length. So if cp_check_possible_namespace_symbols has | |
670 | been called once with argument "A::B::C::member", then that will | |
671 | create symbols "A", "A::B", and "A::B::C". If it is then later | |
672 | called with argument "A::B::D::member", then the new call will | |
673 | generate a new symbol for "A::B::D", but once it sees that "A::B" | |
674 | has already been created, it doesn't bother checking to see if "A" | |
675 | has also been created. */ | |
676 | ||
677 | static int | |
678 | check_possible_namespace_symbols_loop (const char *name, int len, | |
679 | struct objfile *objfile) | |
680 | { | |
681 | if (name[len] == ':') | |
682 | { | |
683 | int done; | |
684 | int next_len = len + 2; | |
685 | ||
686 | next_len += cp_find_first_component (name + next_len); | |
687 | done = check_possible_namespace_symbols_loop (name, next_len, | |
688 | objfile); | |
689 | ||
690 | if (!done) | |
691 | done = check_one_possible_namespace_symbol (name, len, objfile); | |
692 | ||
693 | return done; | |
1fcb5155 | 694 | } |
5c4e30ca DC |
695 | else |
696 | return 0; | |
697 | } | |
698 | ||
699 | /* Check to see if there's already a possible namespace symbol in | |
700 | OBJFILE whose name is the initial substring of NAME of length LEN. | |
701 | If not, create one and return 0; otherwise, return 1. */ | |
702 | ||
703 | static int | |
704 | check_one_possible_namespace_symbol (const char *name, int len, | |
705 | struct objfile *objfile) | |
706 | { | |
707 | struct block *block = get_possible_namespace_block (objfile); | |
ec5cdd75 DJ |
708 | char *name_copy = alloca (len + 1); |
709 | struct symbol *sym; | |
710 | ||
711 | memcpy (name_copy, name, len); | |
712 | name_copy[len] = '\0'; | |
713 | sym = lookup_block_symbol (block, name_copy, NULL, VAR_DOMAIN); | |
5c4e30ca DC |
714 | |
715 | if (sym == NULL) | |
716 | { | |
ec5cdd75 | 717 | struct type *type; |
ec5cdd75 DJ |
718 | |
719 | type = init_type (TYPE_CODE_NAMESPACE, 0, 0, name_copy, objfile); | |
720 | ||
5c4e30ca DC |
721 | TYPE_TAG_NAME (type) = TYPE_NAME (type); |
722 | ||
4a146b47 | 723 | sym = obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); |
5c4e30ca DC |
724 | memset (sym, 0, sizeof (struct symbol)); |
725 | SYMBOL_LANGUAGE (sym) = language_cplus; | |
04a679b8 TT |
726 | /* Note that init_type copied the name to the objfile's |
727 | obstack. */ | |
728 | SYMBOL_SET_NAMES (sym, TYPE_NAME (type), len, 0, objfile); | |
5c4e30ca DC |
729 | SYMBOL_CLASS (sym) = LOC_TYPEDEF; |
730 | SYMBOL_TYPE (sym) = type; | |
731 | SYMBOL_DOMAIN (sym) = VAR_DOMAIN; | |
732 | ||
733 | dict_add_symbol (BLOCK_DICT (block), sym); | |
734 | ||
735 | return 0; | |
736 | } | |
737 | else | |
ec5cdd75 | 738 | return 1; |
5c4e30ca DC |
739 | } |
740 | ||
741 | /* Look for a symbol named NAME in all the possible namespace blocks. | |
21b556f4 | 742 | If one is found, return it. */ |
5c4e30ca DC |
743 | |
744 | static struct symbol * | |
21b556f4 | 745 | lookup_possible_namespace_symbol (const char *name) |
5c4e30ca DC |
746 | { |
747 | struct objfile *objfile; | |
748 | ||
749 | ALL_OBJFILES (objfile) | |
750 | { | |
751 | struct symbol *sym; | |
752 | ||
753 | sym = lookup_block_symbol (get_possible_namespace_block (objfile), | |
754 | name, NULL, VAR_DOMAIN); | |
755 | ||
756 | if (sym != NULL) | |
21b556f4 | 757 | return sym; |
5c4e30ca DC |
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; | |
a3f17187 | 769 | printf_unfiltered (_("Possible namespaces:\n")); |
5c4e30ca DC |
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 | ||
2c0b251b PA |
782 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
783 | extern initialize_file_ftype _initialize_cp_namespace; | |
784 | ||
5c4e30ca DC |
785 | void |
786 | _initialize_cp_namespace (void) | |
787 | { | |
788 | add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, | |
1a966eab | 789 | _("Print the list of possible C++ namespaces."), |
5c4e30ca | 790 | &maint_cplus_cmd_list); |
1fcb5155 | 791 | } |