1 /* Helper routines for C++ support in GDB.
2 Copyright (C) 2003-2015 Free Software Foundation, Inc.
4 Contributed by David Carlton and by Kealia, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "cp-support.h"
23 #include "gdb_obstack.h"
29 #include "dictionary.h"
35 static struct block_symbol
36 cp_lookup_nested_symbol_1 (struct type *container_type,
37 const char *nested_name,
38 const char *concatenated_name,
39 const struct block *block,
40 const domain_enum domain,
41 int basic_lookup, int is_in_anonymous);
43 static struct type *cp_lookup_transparent_type_loop (const char *name,
47 /* Check to see if SYMBOL refers to an object contained within an
48 anonymous namespace; if so, add an appropriate using directive. */
51 cp_scan_for_anonymous_namespaces (const struct symbol *const symbol,
52 struct objfile *const objfile)
54 if (SYMBOL_DEMANGLED_NAME (symbol) != NULL)
56 const char *name = SYMBOL_DEMANGLED_NAME (symbol);
57 unsigned int previous_component;
58 unsigned int next_component;
60 /* Start with a quick-and-dirty check for mention of "(anonymous
63 if (!cp_is_in_anonymous (name))
66 previous_component = 0;
67 next_component = cp_find_first_component (name + previous_component);
69 while (name[next_component] == ':')
71 if (((next_component - previous_component)
72 == CP_ANONYMOUS_NAMESPACE_LEN)
73 && strncmp (name + previous_component,
74 CP_ANONYMOUS_NAMESPACE_STR,
75 CP_ANONYMOUS_NAMESPACE_LEN) == 0)
77 int dest_len = (previous_component == 0
78 ? 0 : previous_component - 2);
79 int src_len = next_component;
81 char *dest = alloca (dest_len + 1);
82 char *src = alloca (src_len + 1);
84 memcpy (dest, name, dest_len);
85 memcpy (src, name, src_len);
87 dest[dest_len] = '\0';
90 /* We've found a component of the name that's an
91 anonymous namespace. So add symbols in it to the
92 namespace given by the previous component if there is
93 one, or to the global namespace if there isn't. */
94 cp_add_using_directive (dest, src, NULL, NULL, NULL, 1,
95 &objfile->objfile_obstack);
97 /* The "+ 2" is for the "::". */
98 previous_component = next_component + 2;
99 next_component = (previous_component
100 + cp_find_first_component (name
101 + previous_component));
106 /* Add a using directive to using_directives. If the using directive
107 in question has already been added, don't add it twice.
109 Create a new struct using_direct which imports the namespace SRC
110 into the scope DEST. ALIAS is the name of the imported namespace
111 in the current scope. If ALIAS is NULL then the namespace is known
112 by its original name. DECLARATION is the name if the imported
113 varable if this is a declaration import (Eg. using A::x), otherwise
114 it is NULL. EXCLUDES is a list of names not to import from an
115 imported module or NULL. If COPY_NAMES is non-zero, then the
116 arguments are copied into newly allocated memory so they can be
117 temporaries. For EXCLUDES the VEC pointers are copied but the
118 pointed to characters are not copied. */
121 cp_add_using_directive (const char *dest,
124 const char *declaration,
125 VEC (const_char_ptr) *excludes,
127 struct obstack *obstack)
129 struct using_direct *current;
130 struct using_direct *newobj;
132 /* Has it already been added? */
134 for (current = using_directives; current != NULL; current = current->next)
139 if (strcmp (current->import_src, src) != 0)
141 if (strcmp (current->import_dest, dest) != 0)
143 if ((alias == NULL && current->alias != NULL)
144 || (alias != NULL && current->alias == NULL)
145 || (alias != NULL && current->alias != NULL
146 && strcmp (alias, current->alias) != 0))
148 if ((declaration == NULL && current->declaration != NULL)
149 || (declaration != NULL && current->declaration == NULL)
150 || (declaration != NULL && current->declaration != NULL
151 && strcmp (declaration, current->declaration) != 0))
154 /* Compare the contents of EXCLUDES. */
155 for (ix = 0; VEC_iterate (const_char_ptr, excludes, ix, param); ix++)
156 if (current->excludes[ix] == NULL
157 || strcmp (param, current->excludes[ix]) != 0)
159 if (ix < VEC_length (const_char_ptr, excludes)
160 || current->excludes[ix] != NULL)
163 /* Parameters exactly match CURRENT. */
167 newobj = obstack_alloc (obstack, (sizeof (*newobj)
168 + (VEC_length (const_char_ptr, excludes)
169 * sizeof (*newobj->excludes))));
170 memset (newobj, 0, sizeof (*newobj));
174 newobj->import_src = obstack_copy0 (obstack, src, strlen (src));
175 newobj->import_dest = obstack_copy0 (obstack, dest, strlen (dest));
179 newobj->import_src = src;
180 newobj->import_dest = dest;
183 if (alias != NULL && copy_names)
184 newobj->alias = obstack_copy0 (obstack, alias, strlen (alias));
186 newobj->alias = alias;
188 if (declaration != NULL && copy_names)
189 newobj->declaration = obstack_copy0 (obstack,
190 declaration, strlen (declaration));
192 newobj->declaration = declaration;
194 memcpy (newobj->excludes, VEC_address (const_char_ptr, excludes),
195 VEC_length (const_char_ptr, excludes) * sizeof (*newobj->excludes));
196 newobj->excludes[VEC_length (const_char_ptr, excludes)] = NULL;
198 newobj->next = using_directives;
199 using_directives = newobj;
202 /* Test whether or not NAMESPACE looks like it mentions an anonymous
203 namespace; return nonzero if so. */
206 cp_is_in_anonymous (const char *symbol_name)
208 return (strstr (symbol_name, CP_ANONYMOUS_NAMESPACE_STR)
212 /* Look up NAME in DOMAIN in BLOCK's static block and in global blocks.
213 If IS_IN_ANONYMOUS is nonzero, the symbol in question is located
214 within an anonymous namespace. */
216 static struct block_symbol
217 cp_basic_lookup_symbol (const char *name, const struct block *block,
218 const domain_enum domain, int is_in_anonymous)
220 struct block_symbol sym;
222 sym = lookup_symbol_in_static_block (name, block, domain);
223 if (sym.symbol != NULL)
228 /* Symbols defined in anonymous namespaces have external linkage
229 but should be treated as local to a single file nonetheless.
230 So we only search the current file's global block. */
232 const struct block *global_block = block_global_block (block);
234 if (global_block != NULL)
236 sym.symbol = lookup_symbol_in_block (name, global_block, domain);
237 sym.block = global_block;
241 sym = lookup_global_symbol (name, block, domain);
246 /* Search bare symbol NAME in DOMAIN in BLOCK.
247 NAME is guaranteed to not have any scope (no "::") in its name, though
248 if for example NAME is a template spec then "::" may appear in the
250 If LANGDEF is non-NULL then try to lookup NAME as a primitive type in
251 that language. Normally we wouldn't need LANGDEF but fortran also uses
253 If SEARCH is non-zero then see if we can determine "this" from BLOCK, and
254 if so then also search for NAME in that class. */
256 static struct block_symbol
257 cp_lookup_bare_symbol (const struct language_defn *langdef,
258 const char *name, const struct block *block,
259 const domain_enum domain, int search)
261 struct block_symbol sym;
263 /* Note: We can't do a simple assert for ':' not being in NAME because
264 ':' may be in the args of a template spec. This isn't intended to be
265 a complete test, just cheap and documentary. */
266 if (strchr (name, '<') == NULL && strchr (name, '(') == NULL)
267 gdb_assert (strchr (name, ':') == NULL);
269 sym = lookup_symbol_in_static_block (name, block, domain);
270 if (sym.symbol != NULL)
273 /* If we didn't find a definition for a builtin type in the static block,
274 search for it now. This is actually the right thing to do and can be
275 a massive performance win. E.g., when debugging a program with lots of
276 shared libraries we could search all of them only to find out the
277 builtin type isn't defined in any of them. This is common for types
279 if (langdef != NULL && domain == VAR_DOMAIN)
281 struct gdbarch *gdbarch;
284 gdbarch = target_gdbarch ();
286 gdbarch = block_gdbarch (block);
288 = language_lookup_primitive_type_as_symbol (langdef, gdbarch, name);
290 if (sym.symbol != NULL)
294 sym = lookup_global_symbol (name, block, domain);
295 if (sym.symbol != NULL)
300 struct block_symbol lang_this;
303 lang_this = lookup_language_this (language_def (language_cplus), block);
304 if (lang_this.symbol == NULL)
305 return (struct block_symbol) {NULL, NULL};
307 type = check_typedef (TYPE_TARGET_TYPE (SYMBOL_TYPE (lang_this.symbol)));
308 /* If TYPE_NAME is NULL, abandon trying to find this symbol.
309 This can happen for lambda functions compiled with clang++,
310 which outputs no name for the container class. */
311 if (TYPE_NAME (type) == NULL)
312 return (struct block_symbol) {NULL, NULL};
314 /* Look for symbol NAME in this class. */
315 sym = cp_lookup_nested_symbol (type, name, block, domain);
321 /* Search NAME in DOMAIN in all static blocks, and then in all baseclasses.
322 BLOCK specifies the context in which to perform the search.
323 NAME is guaranteed to have scope (contain "::") and PREFIX_LEN specifies
324 the length of the entire scope of NAME (up to, but not including, the last
327 Note: At least in the case of Fortran, which also uses this code, there
328 may be no text after the last "::". */
330 static struct block_symbol
331 cp_search_static_and_baseclasses (const char *name,
332 const struct block *block,
333 const domain_enum domain,
334 unsigned int prefix_len,
337 struct block_symbol sym;
338 char *klass, *nested;
339 struct cleanup *cleanup;
340 struct block_symbol klass_sym;
341 struct type *klass_type;
343 /* The test here uses <= instead of < because Fortran also uses this,
344 and the module.exp testcase will pass "modmany::" for NAME here. */
345 gdb_assert (prefix_len + 2 <= strlen (name));
346 gdb_assert (name[prefix_len + 1] == ':');
348 /* Find the name of the class and the name of the method, variable, etc. */
350 /* The class name is everything up to and including PREFIX_LEN. */
351 klass = savestring (name, prefix_len);
353 /* The rest of the name is everything else past the initial scope
355 nested = xstrdup (name + prefix_len + 2);
357 /* Add cleanups to free memory for these strings. */
358 cleanup = make_cleanup (xfree, klass);
359 make_cleanup (xfree, nested);
361 /* Lookup a class named KLASS. If none is found, there is nothing
362 more that can be done. KLASS could be a namespace, so always look
363 in VAR_DOMAIN. This works for classes too because of
364 symbol_matches_domain (which should be replaced with something else,
365 but it's what we have today). */
366 klass_sym = lookup_global_symbol (klass, block, VAR_DOMAIN);
367 if (klass_sym.symbol == NULL)
369 do_cleanups (cleanup);
370 return (struct block_symbol) {NULL, NULL};
372 klass_type = SYMBOL_TYPE (klass_sym.symbol);
374 /* Look for a symbol named NESTED in this class.
375 The caller is assumed to have already have done a basic lookup of NAME.
376 So we pass zero for BASIC_LOOKUP to cp_lookup_nested_symbol_1 here. */
377 sym = cp_lookup_nested_symbol_1 (klass_type, nested, name, block, domain,
380 do_cleanups (cleanup);
384 /* Look up NAME in the C++ namespace NAMESPACE. Other arguments are
385 as in cp_lookup_symbol_nonlocal. If SEARCH is non-zero, search
386 through base classes for a matching symbol.
388 Note: Part of the complexity is because NAME may itself specify scope.
389 Part of the complexity is also because this handles the case where
390 there is no scoping in which case we also try looking in the class of
391 "this" if we can compute it. */
393 static struct block_symbol
394 cp_lookup_symbol_in_namespace (const char *the_namespace, const char *name,
395 const struct block *block,
396 const domain_enum domain, int search)
398 char *concatenated_name = NULL;
400 unsigned int prefix_len;
401 struct block_symbol sym;
403 if (the_namespace[0] != '\0')
405 concatenated_name = alloca (strlen (the_namespace) + 2
406 + strlen (name) + 1);
407 strcpy (concatenated_name, the_namespace);
408 strcat (concatenated_name, "::");
409 strcat (concatenated_name, name);
410 name = concatenated_name;
413 prefix_len = cp_entire_prefix_len (name);
415 return cp_lookup_bare_symbol (NULL, name, block, domain, search);
417 /* This would be simpler if we just called cp_lookup_nested_symbol
418 at this point. But that would require first looking up the containing
419 class/namespace. Since we're only searching static and global blocks
420 there's often no need to first do that lookup. */
423 = the_namespace[0] != '\0' && cp_is_in_anonymous (the_namespace);
424 sym = cp_basic_lookup_symbol (name, block, domain, is_in_anonymous);
425 if (sym.symbol != NULL)
429 sym = cp_search_static_and_baseclasses (name, block, domain, prefix_len,
435 /* Used for cleanups to reset the "searched" flag in case of an error. */
438 reset_directive_searched (void *data)
440 struct using_direct *direct = data;
441 direct->searched = 0;
444 /* Search for NAME by applying all import statements belonging to
445 BLOCK which are applicable in SCOPE. If DECLARATION_ONLY the
446 search is restricted to using declarations.
454 If SEARCH_PARENTS the search will include imports which are
455 applicable in parents of SCOPE.
465 If SCOPE is "A::B" and SEARCH_PARENTS is true the imports of
466 namespaces X and Y will be considered. If SEARCH_PARENTS is false
467 only the import of Y is considered.
469 SEARCH_SCOPE_FIRST is an internal implementation detail: Callers must
470 pass 0 for it. Internally we pass 1 when recursing. */
472 static struct block_symbol
473 cp_lookup_symbol_via_imports (const char *scope,
475 const struct block *block,
476 const domain_enum domain,
477 const int search_scope_first,
478 const int declaration_only,
479 const int search_parents)
481 struct using_direct *current;
482 struct block_symbol sym;
485 struct cleanup *searched_cleanup;
489 /* First, try to find the symbol in the given namespace if requested. */
490 if (search_scope_first)
491 sym = cp_lookup_symbol_in_namespace (scope, name,
494 if (sym.symbol != NULL)
497 /* Go through the using directives. If any of them add new names to
498 the namespace we're searching in, see if we can find a match by
501 for (current = block_using (block);
503 current = current->next)
505 const char **excludep;
507 len = strlen (current->import_dest);
508 directive_match = (search_parents
509 ? (startswith (scope, current->import_dest)
512 || scope[len] == '\0'))
513 : strcmp (scope, current->import_dest) == 0);
515 /* If the import destination is the current scope or one of its
516 ancestors then it is applicable. */
517 if (directive_match && !current->searched)
519 /* Mark this import as searched so that the recursive call
520 does not search it again. */
521 current->searched = 1;
522 searched_cleanup = make_cleanup (reset_directive_searched,
525 /* If there is an import of a single declaration, compare the
526 imported declaration (after optional renaming by its alias)
527 with the sought out name. If there is a match pass
528 current->import_src as NAMESPACE to direct the search
529 towards the imported namespace. */
530 if (current->declaration
531 && strcmp (name, current->alias
532 ? current->alias : current->declaration) == 0)
533 sym = cp_lookup_symbol_in_namespace (current->import_src,
534 current->declaration,
537 /* If this is a DECLARATION_ONLY search or a symbol was found
538 or this import statement was an import declaration, the
539 search of this import is complete. */
540 if (declaration_only || sym.symbol != NULL || current->declaration)
542 current->searched = 0;
543 discard_cleanups (searched_cleanup);
545 if (sym.symbol != NULL)
551 /* Do not follow CURRENT if NAME matches its EXCLUDES. */
552 for (excludep = current->excludes; *excludep; excludep++)
553 if (strcmp (name, *excludep) == 0)
557 discard_cleanups (searched_cleanup);
561 if (current->alias != NULL
562 && strcmp (name, current->alias) == 0)
563 /* If the import is creating an alias and the alias matches
564 the sought name. Pass current->import_src as the NAME to
565 direct the search towards the aliased namespace. */
567 sym = cp_lookup_symbol_in_namespace (scope,
571 else if (current->alias == NULL)
573 /* If this import statement creates no alias, pass
574 current->inner as NAMESPACE to direct the search
575 towards the imported namespace. */
576 sym = cp_lookup_symbol_via_imports (current->import_src,
580 current->searched = 0;
581 discard_cleanups (searched_cleanup);
583 if (sym.symbol != NULL)
588 return (struct block_symbol) {NULL, NULL};
591 /* Helper function that searches an array of symbols for one named NAME. */
593 static struct symbol *
594 search_symbol_list (const char *name, int num,
595 struct symbol **syms)
599 /* Maybe we should store a dictionary in here instead. */
600 for (i = 0; i < num; ++i)
602 if (strcmp (name, SYMBOL_NATURAL_NAME (syms[i])) == 0)
608 /* Like cp_lookup_symbol_via_imports, but if BLOCK is a function, it
609 searches through the template parameters of the function and the
613 cp_lookup_symbol_imports_or_template (const char *scope,
615 const struct block *block,
616 const domain_enum domain)
618 struct symbol *function = BLOCK_FUNCTION (block);
619 struct block_symbol result;
621 if (symbol_lookup_debug)
623 fprintf_unfiltered (gdb_stdlog,
624 "cp_lookup_symbol_imports_or_template"
625 " (%s, %s, %s, %s)\n",
626 scope, name, host_address_to_string (block),
627 domain_name (domain));
630 if (function != NULL && SYMBOL_LANGUAGE (function) == language_cplus)
632 /* Search the function's template parameters. */
633 if (SYMBOL_IS_CPLUS_TEMPLATE_FUNCTION (function))
635 struct template_symbol *templ
636 = (struct template_symbol *) function;
637 struct symbol *sym = search_symbol_list (name,
638 templ->n_template_arguments,
639 templ->template_arguments);
643 if (symbol_lookup_debug)
645 fprintf_unfiltered (gdb_stdlog,
646 "cp_lookup_symbol_imports_or_template"
648 host_address_to_string (sym));
650 return (struct block_symbol) {sym, block};
654 /* Search the template parameters of the function's defining
656 if (SYMBOL_NATURAL_NAME (function))
658 struct type *context;
659 char *name_copy = xstrdup (SYMBOL_NATURAL_NAME (function));
660 struct cleanup *cleanups = make_cleanup (xfree, name_copy);
661 const struct language_defn *lang = language_def (language_cplus);
662 struct gdbarch *arch = symbol_arch (function);
663 const struct block *parent = BLOCK_SUPERBLOCK (block);
668 unsigned int prefix_len = cp_entire_prefix_len (name_copy);
674 name_copy[prefix_len] = '\0';
675 context = lookup_typename (lang, arch,
684 = search_symbol_list (name,
685 TYPE_N_TEMPLATE_ARGUMENTS (context),
686 TYPE_TEMPLATE_ARGUMENTS (context));
689 do_cleanups (cleanups);
690 if (symbol_lookup_debug)
694 "cp_lookup_symbol_imports_or_template (...) = %s\n",
695 host_address_to_string (sym));
697 return (struct block_symbol) {sym, parent};
701 do_cleanups (cleanups);
705 result = cp_lookup_symbol_via_imports (scope, name, block, domain, 0, 1, 1);
706 if (symbol_lookup_debug)
708 fprintf_unfiltered (gdb_stdlog,
709 "cp_lookup_symbol_imports_or_template (...) = %s\n",
710 result.symbol != NULL
711 ? host_address_to_string (result.symbol) : "NULL");
716 /* Search for NAME by applying relevant import statements belonging to BLOCK
717 and its parents. SCOPE is the namespace scope of the context in which the
718 search is being evaluated. */
720 static struct block_symbol
721 cp_lookup_symbol_via_all_imports (const char *scope, const char *name,
722 const struct block *block,
723 const domain_enum domain)
725 struct block_symbol sym;
727 while (block != NULL)
729 sym = cp_lookup_symbol_via_imports (scope, name, block, domain, 0, 0, 1);
733 block = BLOCK_SUPERBLOCK (block);
736 return (struct block_symbol) {NULL, NULL};
739 /* Searches for NAME in the current namespace, and by applying
740 relevant import statements belonging to BLOCK and its parents.
741 SCOPE is the namespace scope of the context in which the search is
745 cp_lookup_symbol_namespace (const char *scope,
747 const struct block *block,
748 const domain_enum domain)
750 struct block_symbol sym;
752 if (symbol_lookup_debug)
754 fprintf_unfiltered (gdb_stdlog,
755 "cp_lookup_symbol_namespace (%s, %s, %s, %s)\n",
756 scope, name, host_address_to_string (block),
757 domain_name (domain));
760 /* First, try to find the symbol in the given namespace. */
761 sym = cp_lookup_symbol_in_namespace (scope, name, block, domain, 1);
763 /* Search for name in namespaces imported to this and parent blocks. */
764 if (sym.symbol == NULL)
765 sym = cp_lookup_symbol_via_all_imports (scope, name, block, domain);
767 if (symbol_lookup_debug)
769 fprintf_unfiltered (gdb_stdlog,
770 "cp_lookup_symbol_namespace (...) = %s\n",
772 ? host_address_to_string (sym.symbol) : "NULL");
777 /* Lookup NAME at namespace scope (or, in C terms, in static and
778 global variables). SCOPE is the namespace that the current
779 function is defined within; only consider namespaces whose length
780 is at least SCOPE_LEN. Other arguments are as in
781 cp_lookup_symbol_nonlocal.
783 For example, if we're within a function A::B::f and looking for a
784 symbol x, this will get called with NAME = "x", SCOPE = "A::B", and
785 SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same,
786 but with SCOPE_LEN = 1. And then it calls itself with NAME and
787 SCOPE the same, but with SCOPE_LEN = 4. This third call looks for
788 "A::B::x"; if it doesn't find it, then the second call looks for
789 "A::x", and if that call fails, then the first call looks for
792 static struct block_symbol
793 lookup_namespace_scope (const struct language_defn *langdef,
795 const struct block *block,
796 const domain_enum domain,
802 if (scope[scope_len] != '\0')
804 /* Recursively search for names in child namespaces first. */
806 struct block_symbol sym;
807 int new_scope_len = scope_len;
809 /* If the current scope is followed by "::", skip past that. */
810 if (new_scope_len != 0)
812 gdb_assert (scope[new_scope_len] == ':');
815 new_scope_len += cp_find_first_component (scope + new_scope_len);
816 sym = lookup_namespace_scope (langdef, name, block, domain,
817 scope, new_scope_len);
818 if (sym.symbol != NULL)
822 /* Okay, we didn't find a match in our children, so look for the
823 name in the current namespace.
825 If we there is no scope and we know we have a bare symbol, then short
826 circuit everything and call cp_lookup_bare_symbol directly.
827 This isn't an optimization, rather it allows us to pass LANGDEF which
828 is needed for primitive type lookup. The test doesn't have to be
829 perfect: if NAME is a bare symbol that our test doesn't catch (e.g., a
830 template symbol with "::" in the argument list) then
831 cp_lookup_symbol_in_namespace will catch it. */
833 if (scope_len == 0 && strchr (name, ':') == NULL)
834 return cp_lookup_bare_symbol (langdef, name, block, domain, 1);
836 the_namespace = alloca (scope_len + 1);
837 strncpy (the_namespace, scope, scope_len);
838 the_namespace[scope_len] = '\0';
839 return cp_lookup_symbol_in_namespace (the_namespace, name,
843 /* The C++-specific version of name lookup for static and global
844 names. This makes sure that names get looked for in all namespaces
845 that are in scope. NAME is the natural name of the symbol that
846 we're looking for, BLOCK is the block that we're searching within,
847 DOMAIN says what kind of symbols we're looking for. */
850 cp_lookup_symbol_nonlocal (const struct language_defn *langdef,
852 const struct block *block,
853 const domain_enum domain)
855 struct block_symbol sym;
856 const char *scope = block_scope (block);
858 if (symbol_lookup_debug)
860 fprintf_unfiltered (gdb_stdlog,
861 "cp_lookup_symbol_non_local"
862 " (%s, %s (scope %s), %s)\n",
863 name, host_address_to_string (block), scope,
864 domain_name (domain));
867 /* First, try to find the symbol in the given namespace, and all
868 containing namespaces. */
869 sym = lookup_namespace_scope (langdef, name, block, domain, scope, 0);
871 /* Search for name in namespaces imported to this and parent blocks. */
872 if (sym.symbol == NULL)
873 sym = cp_lookup_symbol_via_all_imports (scope, name, block, domain);
875 if (symbol_lookup_debug)
877 fprintf_unfiltered (gdb_stdlog,
878 "cp_lookup_symbol_nonlocal (...) = %s\n",
880 ? host_address_to_string (sym.symbol)
886 /* Search through the base classes of PARENT_TYPE for a base class
887 named NAME and return its type. If not found, return NULL. */
890 cp_find_type_baseclass_by_name (struct type *parent_type, const char *name)
894 parent_type = check_typedef (parent_type);
895 for (i = 0; i < TYPE_N_BASECLASSES (parent_type); ++i)
897 struct type *type = check_typedef (TYPE_BASECLASS (parent_type, i));
898 const char *base_name = TYPE_BASECLASS_NAME (parent_type, i);
900 if (base_name == NULL)
903 if (streq (base_name, name))
906 type = cp_find_type_baseclass_by_name (type, name);
914 /* Search through the base classes of PARENT_TYPE for a symbol named
915 NAME in block BLOCK. */
917 static struct block_symbol
918 find_symbol_in_baseclass (struct type *parent_type, const char *name,
919 const struct block *block, const domain_enum domain,
923 struct block_symbol sym;
924 struct cleanup *cleanup;
925 char *concatenated_name;
929 concatenated_name = NULL;
930 cleanup = make_cleanup (free_current_contents, &concatenated_name);
932 for (i = 0; i < TYPE_N_BASECLASSES (parent_type); ++i)
935 struct type *base_type = TYPE_BASECLASS (parent_type, i);
936 const char *base_name = TYPE_BASECLASS_NAME (parent_type, i);
938 if (base_name == NULL)
941 len = strlen (base_name) + 2 + strlen (name) + 1;
942 concatenated_name = xrealloc (concatenated_name, len);
943 xsnprintf (concatenated_name, len, "%s::%s", base_name, name);
945 sym = cp_lookup_nested_symbol_1 (base_type, name, concatenated_name,
946 block, domain, 1, is_in_anonymous);
947 if (sym.symbol != NULL)
951 do_cleanups (cleanup);
955 /* Helper function to look up NESTED_NAME in CONTAINER_TYPE and in DOMAIN
956 and within the context of BLOCK.
957 NESTED_NAME may have scope ("::").
958 CONTAINER_TYPE needn't have been "check_typedef'd" yet.
959 CONCATENATED_NAME is the fully scoped spelling of NESTED_NAME, it is
960 passed as an argument so that callers can control how space for it is
962 If BASIC_LOOKUP is non-zero then perform a basic lookup of
963 CONCATENATED_NAME. See cp_basic_lookup_symbol for details.
964 If IS_IN_ANONYMOUS is non-zero then CONCATENATED_NAME is in an anonymous
967 static struct block_symbol
968 cp_lookup_nested_symbol_1 (struct type *container_type,
969 const char *nested_name,
970 const char *concatenated_name,
971 const struct block *block,
972 const domain_enum domain,
973 int basic_lookup, int is_in_anonymous)
975 struct block_symbol sym;
977 /* NOTE: carlton/2003-11-10: We don't treat C++ class members
978 of classes like, say, data or function members. Instead,
979 they're just represented by symbols whose names are
980 qualified by the name of the surrounding class. This is
981 just like members of namespaces; in particular,
982 cp_basic_lookup_symbol works when looking them up. */
986 sym = cp_basic_lookup_symbol (concatenated_name, block, domain,
988 if (sym.symbol != NULL)
992 /* Now search all static file-level symbols. We have to do this for things
993 like typedefs in the class. We do not try to guess any imported
994 namespace as even the fully specified namespace search is already not
995 C++ compliant and more assumptions could make it too magic. */
997 /* First search in this symtab, what we want is possibly there. */
998 sym = lookup_symbol_in_static_block (concatenated_name, block, domain);
999 if (sym.symbol != NULL)
1002 /* Nope. We now have to search all static blocks in all objfiles,
1003 even if block != NULL, because there's no guarantees as to which
1004 symtab the symbol we want is in. Except for symbols defined in
1005 anonymous namespaces should be treated as local to a single file,
1006 which we just searched. */
1007 if (!is_in_anonymous)
1009 sym = lookup_static_symbol (concatenated_name, domain);
1010 if (sym.symbol != NULL)
1014 /* If this is a class with baseclasses, search them next. */
1015 container_type = check_typedef (container_type);
1016 if (TYPE_N_BASECLASSES (container_type) > 0)
1018 sym = find_symbol_in_baseclass (container_type, nested_name, block,
1019 domain, is_in_anonymous);
1020 if (sym.symbol != NULL)
1024 return (struct block_symbol) {NULL, NULL};
1027 /* Look up a symbol named NESTED_NAME that is nested inside the C++
1028 class or namespace given by PARENT_TYPE, from within the context
1029 given by BLOCK, and in DOMAIN.
1030 Return NULL if there is no such nested symbol. */
1033 cp_lookup_nested_symbol (struct type *parent_type,
1034 const char *nested_name,
1035 const struct block *block,
1036 const domain_enum domain)
1038 /* type_name_no_tag_or_error provides better error reporting using the
1040 struct type *saved_parent_type = parent_type;
1042 parent_type = check_typedef (parent_type);
1044 if (symbol_lookup_debug)
1046 const char *type_name = type_name_no_tag (saved_parent_type);
1048 fprintf_unfiltered (gdb_stdlog,
1049 "cp_lookup_nested_symbol (%s, %s, %s, %s)\n",
1050 type_name != NULL ? type_name : "unnamed",
1051 nested_name, host_address_to_string (block),
1052 domain_name (domain));
1055 switch (TYPE_CODE (parent_type))
1057 case TYPE_CODE_STRUCT:
1058 case TYPE_CODE_NAMESPACE:
1059 case TYPE_CODE_UNION:
1060 case TYPE_CODE_ENUM:
1061 /* NOTE: Handle modules here as well, because Fortran is re-using the C++
1062 specific code to lookup nested symbols in modules, by calling the
1063 function pointer la_lookup_symbol_nonlocal, which ends up here. */
1064 case TYPE_CODE_MODULE:
1067 const char *parent_name = type_name_no_tag_or_error (saved_parent_type);
1068 struct block_symbol sym;
1069 char *concatenated_name;
1070 int is_in_anonymous;
1072 size = strlen (parent_name) + 2 + strlen (nested_name) + 1;
1073 concatenated_name = alloca (size);
1074 xsnprintf (concatenated_name, size, "%s::%s",
1075 parent_name, nested_name);
1076 is_in_anonymous = cp_is_in_anonymous (concatenated_name);
1078 sym = cp_lookup_nested_symbol_1 (parent_type, nested_name,
1079 concatenated_name, block, domain,
1080 1, is_in_anonymous);
1082 if (symbol_lookup_debug)
1084 fprintf_unfiltered (gdb_stdlog,
1085 "cp_lookup_nested_symbol (...) = %s\n",
1087 ? host_address_to_string (sym.symbol)
1093 case TYPE_CODE_FUNC:
1094 case TYPE_CODE_METHOD:
1095 if (symbol_lookup_debug)
1097 fprintf_unfiltered (gdb_stdlog,
1098 "cp_lookup_nested_symbol (...) = NULL"
1099 " (func/method)\n");
1101 return (struct block_symbol) {NULL, NULL};
1104 internal_error (__FILE__, __LINE__,
1105 _("cp_lookup_nested_symbol called "
1106 "on a non-aggregate type."));
1110 /* The C++-version of lookup_transparent_type. */
1112 /* FIXME: carlton/2004-01-16: The problem that this is trying to
1113 address is that, unfortunately, sometimes NAME is wrong: it may not
1114 include the name of namespaces enclosing the type in question.
1115 lookup_transparent_type gets called when the type in question
1116 is a declaration, and we're trying to find its definition; but, for
1117 declarations, our type name deduction mechanism doesn't work.
1118 There's nothing we can do to fix this in general, I think, in the
1119 absence of debug information about namespaces (I've filed PR
1120 gdb/1511 about this); until such debug information becomes more
1121 prevalent, one heuristic which sometimes looks is to search for the
1122 definition in namespaces containing the current namespace.
1124 We should delete this functions once the appropriate debug
1125 information becomes more widespread. (GCC 3.4 will be the first
1126 released version of GCC with such information.) */
1129 cp_lookup_transparent_type (const char *name)
1131 /* First, try the honest way of looking up the definition. */
1132 struct type *t = basic_lookup_transparent_type (name);
1138 /* If that doesn't work and we're within a namespace, look there
1140 scope = block_scope (get_selected_block (0));
1142 if (scope[0] == '\0')
1145 return cp_lookup_transparent_type_loop (name, scope, 0);
1148 /* Lookup the type definition associated to NAME in namespaces/classes
1149 containing SCOPE whose name is strictly longer than LENGTH. LENGTH
1150 must be the index of the start of a component of SCOPE. */
1152 static struct type *
1153 cp_lookup_transparent_type_loop (const char *name,
1157 int scope_length = length + cp_find_first_component (scope + length);
1160 /* If the current scope is followed by "::", look in the next
1162 if (scope[scope_length] == ':')
1165 = cp_lookup_transparent_type_loop (name, scope,
1172 full_name = alloca (scope_length + 2 + strlen (name) + 1);
1173 strncpy (full_name, scope, scope_length);
1174 strncpy (full_name + scope_length, "::", 2);
1175 strcpy (full_name + scope_length + 2, name);
1177 return basic_lookup_transparent_type (full_name);
1180 /* This used to do something but was removed when it became
1184 maintenance_cplus_namespace (char *args, int from_tty)
1186 printf_unfiltered (_("The `maint namespace' command was removed.\n"));
1189 /* Provide a prototype to silence -Wmissing-prototypes. */
1190 extern initialize_file_ftype _initialize_cp_namespace;
1193 _initialize_cp_namespace (void)
1195 struct cmd_list_element *cmd;
1197 cmd = add_cmd ("namespace", class_maintenance,
1198 maintenance_cplus_namespace,
1199 _("Deprecated placeholder for removed functionality."),
1200 &maint_cplus_cmd_list);
1201 deprecate_cmd (cmd, NULL);