| /* Helper routines for C++ support in GDB. |
| Copyright (C) 2003-2021 Free Software Foundation, Inc. |
| |
| Contributed by David Carlton and by Kealia, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "cp-support.h" |
| #include "gdb_obstack.h" |
| #include "symtab.h" |
| #include "symfile.h" |
| #include "block.h" |
| #include "objfiles.h" |
| #include "gdbtypes.h" |
| #include "dictionary.h" |
| #include "command.h" |
| #include "frame.h" |
| #include "buildsym.h" |
| #include "language.h" |
| #include "namespace.h" |
| #include <string> |
| |
| static struct block_symbol |
| cp_lookup_nested_symbol_1 (struct type *container_type, |
| const char *nested_name, |
| const char *concatenated_name, |
| const struct block *block, |
| const domain_enum domain, |
| int basic_lookup, int is_in_anonymous); |
| |
| static struct type *cp_lookup_transparent_type_loop (const char *name, |
| const char *scope, |
| int scope_len); |
| |
| /* Check to see if SYMBOL refers to an object contained within an |
| anonymous namespace; if so, add an appropriate using directive. */ |
| |
| void |
| cp_scan_for_anonymous_namespaces (struct buildsym_compunit *compunit, |
| const struct symbol *const symbol, |
| struct objfile *const objfile) |
| { |
| if (symbol->demangled_name () != NULL) |
| { |
| const char *name = symbol->demangled_name (); |
| unsigned int previous_component; |
| unsigned int next_component; |
| |
| /* Start with a quick-and-dirty check for mention of "(anonymous |
| namespace)". */ |
| |
| if (!cp_is_in_anonymous (name)) |
| return; |
| |
| previous_component = 0; |
| next_component = cp_find_first_component (name + previous_component); |
| |
| while (name[next_component] == ':') |
| { |
| if (((next_component - previous_component) |
| == CP_ANONYMOUS_NAMESPACE_LEN) |
| && strncmp (name + previous_component, |
| CP_ANONYMOUS_NAMESPACE_STR, |
| CP_ANONYMOUS_NAMESPACE_LEN) == 0) |
| { |
| int dest_len = (previous_component == 0 |
| ? 0 : previous_component - 2); |
| int src_len = next_component; |
| |
| char *dest = (char *) alloca (dest_len + 1); |
| char *src = (char *) alloca (src_len + 1); |
| |
| memcpy (dest, name, dest_len); |
| memcpy (src, name, src_len); |
| |
| dest[dest_len] = '\0'; |
| src[src_len] = '\0'; |
| |
| /* We've found a component of the name that's an |
| anonymous namespace. So add symbols in it to the |
| namespace given by the previous component if there is |
| one, or to the global namespace if there isn't. */ |
| std::vector<const char *> excludes; |
| add_using_directive (compunit->get_local_using_directives (), |
| dest, src, NULL, NULL, excludes, |
| 1, &objfile->objfile_obstack); |
| } |
| /* The "+ 2" is for the "::". */ |
| previous_component = next_component + 2; |
| next_component = (previous_component |
| + cp_find_first_component (name |
| + previous_component)); |
| } |
| } |
| } |
| |
| /* Test whether or not NAMESPACE looks like it mentions an anonymous |
| namespace; return nonzero if so. */ |
| |
| int |
| cp_is_in_anonymous (const char *symbol_name) |
| { |
| return (strstr (symbol_name, CP_ANONYMOUS_NAMESPACE_STR) |
| != NULL); |
| } |
| |
| /* Look up NAME in DOMAIN in BLOCK's static block and in global blocks. |
| If IS_IN_ANONYMOUS is nonzero, the symbol in question is located |
| within an anonymous namespace. */ |
| |
| static struct block_symbol |
| cp_basic_lookup_symbol (const char *name, const struct block *block, |
| const domain_enum domain, int is_in_anonymous) |
| { |
| struct block_symbol sym; |
| |
| sym = lookup_symbol_in_static_block (name, block, domain); |
| if (sym.symbol != NULL) |
| return sym; |
| |
| if (is_in_anonymous) |
| { |
| /* Symbols defined in anonymous namespaces have external linkage |
| but should be treated as local to a single file nonetheless. |
| So we only search the current file's global block. */ |
| |
| const struct block *global_block = block_global_block (block); |
| |
| if (global_block != NULL) |
| { |
| sym.symbol = lookup_symbol_in_block (name, |
| symbol_name_match_type::FULL, |
| global_block, domain); |
| sym.block = global_block; |
| } |
| } |
| else |
| sym = lookup_global_symbol (name, block, domain); |
| |
| return sym; |
| } |
| |
| /* Search bare symbol NAME in DOMAIN in BLOCK. |
| NAME is guaranteed to not have any scope (no "::") in its name, though |
| if for example NAME is a template spec then "::" may appear in the |
| argument list. |
| If LANGDEF is non-NULL then try to lookup NAME as a primitive type in |
| that language. Normally we wouldn't need LANGDEF but fortran also uses |
| this code. |
| If SEARCH is non-zero then see if we can determine "this" from BLOCK, and |
| if so then also search for NAME in that class. */ |
| |
| static struct block_symbol |
| cp_lookup_bare_symbol (const struct language_defn *langdef, |
| const char *name, const struct block *block, |
| const domain_enum domain, int search) |
| { |
| struct block_symbol sym; |
| |
| /* Note: We can't do a simple assert for ':' not being in NAME because |
| ':' may be in the args of a template spec. This isn't intended to be |
| a complete test, just cheap and documentary. */ |
| if (strchr (name, '<') == NULL && strchr (name, '(') == NULL) |
| gdb_assert (strstr (name, "::") == NULL); |
| |
| sym = lookup_symbol_in_static_block (name, block, domain); |
| if (sym.symbol != NULL) |
| return sym; |
| |
| /* If we didn't find a definition for a builtin type in the static block, |
| search for it now. This is actually the right thing to do and can be |
| a massive performance win. E.g., when debugging a program with lots of |
| shared libraries we could search all of them only to find out the |
| builtin type isn't defined in any of them. This is common for types |
| like "void". */ |
| if (langdef != NULL && domain == VAR_DOMAIN) |
| { |
| struct gdbarch *gdbarch; |
| |
| if (block == NULL) |
| gdbarch = target_gdbarch (); |
| else |
| gdbarch = block_gdbarch (block); |
| sym.symbol |
| = language_lookup_primitive_type_as_symbol (langdef, gdbarch, name); |
| sym.block = NULL; |
| if (sym.symbol != NULL) |
| return sym; |
| } |
| |
| sym = lookup_global_symbol (name, block, domain); |
| if (sym.symbol != NULL) |
| return sym; |
| |
| if (search) |
| { |
| struct block_symbol lang_this; |
| struct type *type; |
| |
| lang_this.symbol = NULL; |
| |
| if (langdef != NULL) |
| lang_this = lookup_language_this (langdef, block); |
| |
| if (lang_this.symbol == NULL) |
| return {}; |
| |
| |
| type = check_typedef (TYPE_TARGET_TYPE (SYMBOL_TYPE (lang_this.symbol))); |
| /* If TYPE_NAME is NULL, abandon trying to find this symbol. |
| This can happen for lambda functions compiled with clang++, |
| which outputs no name for the container class. */ |
| if (type->name () == NULL) |
| return {}; |
| |
| /* Look for symbol NAME in this class. */ |
| sym = cp_lookup_nested_symbol (type, name, block, domain); |
| } |
| |
| return sym; |
| } |
| |
| /* Search NAME in DOMAIN in all static blocks, and then in all baseclasses. |
| BLOCK specifies the context in which to perform the search. |
| NAME is guaranteed to have scope (contain "::") and PREFIX_LEN specifies |
| the length of the entire scope of NAME (up to, but not including, the last |
| "::". |
| |
| Note: At least in the case of Fortran, which also uses this code, there |
| may be no text after the last "::". */ |
| |
| static struct block_symbol |
| cp_search_static_and_baseclasses (const char *name, |
| const struct block *block, |
| const domain_enum domain, |
| unsigned int prefix_len, |
| int is_in_anonymous) |
| { |
| /* Check for malformed input. */ |
| if (prefix_len + 2 > strlen (name) || name[prefix_len + 1] != ':') |
| return {}; |
| |
| /* The class, namespace or function name is everything up to and |
| including PREFIX_LEN. */ |
| std::string scope (name, prefix_len); |
| |
| /* The rest of the name is everything else past the initial scope |
| operator. */ |
| const char *nested = name + prefix_len + 2; |
| |
| /* Lookup the scope symbol. If none is found, there is nothing more |
| that can be done. SCOPE could be a namespace, so always look in |
| VAR_DOMAIN. This works for classes too because of |
| symbol_matches_domain (which should be replaced with something |
| else, but it's what we have today). */ |
| block_symbol scope_sym = lookup_symbol_in_static_block (scope.c_str (), |
| block, VAR_DOMAIN); |
| if (scope_sym.symbol == NULL) |
| scope_sym = lookup_global_symbol (scope.c_str (), block, VAR_DOMAIN); |
| if (scope_sym.symbol == NULL) |
| return {}; |
| |
| struct type *scope_type = SYMBOL_TYPE (scope_sym.symbol); |
| |
| /* If the scope is a function/method, then look up NESTED as a local |
| static variable. E.g., "print 'function()::static_var'". */ |
| if ((scope_type->code () == TYPE_CODE_FUNC |
| || scope_type->code () == TYPE_CODE_METHOD) |
| && domain == VAR_DOMAIN) |
| return lookup_symbol (nested, SYMBOL_BLOCK_VALUE (scope_sym.symbol), |
| VAR_DOMAIN, NULL); |
| |
| /* Look for a symbol named NESTED in this class/namespace. |
| The caller is assumed to have already have done a basic lookup of NAME. |
| So we pass zero for BASIC_LOOKUP to cp_lookup_nested_symbol_1 here. */ |
| return cp_lookup_nested_symbol_1 (scope_type, nested, name, |
| block, domain, 0, is_in_anonymous); |
| } |
| |
| /* Look up NAME in the C++ namespace NAMESPACE. Other arguments are |
| as in cp_lookup_symbol_nonlocal. If SEARCH is non-zero, search |
| through base classes for a matching symbol. |
| |
| Note: Part of the complexity is because NAME may itself specify scope. |
| Part of the complexity is also because this handles the case where |
| there is no scoping in which case we also try looking in the class of |
| "this" if we can compute it. */ |
| |
| static struct block_symbol |
| cp_lookup_symbol_in_namespace (const char *the_namespace, const char *name, |
| const struct block *block, |
| const domain_enum domain, int search) |
| { |
| char *concatenated_name = NULL; |
| int is_in_anonymous; |
| unsigned int prefix_len; |
| struct block_symbol sym; |
| |
| if (the_namespace[0] != '\0') |
| { |
| concatenated_name |
| = (char *) alloca (strlen (the_namespace) + 2 + strlen (name) + 1); |
| strcpy (concatenated_name, the_namespace); |
| strcat (concatenated_name, "::"); |
| strcat (concatenated_name, name); |
| name = concatenated_name; |
| } |
| |
| prefix_len = cp_entire_prefix_len (name); |
| if (prefix_len == 0) |
| return cp_lookup_bare_symbol (NULL, name, block, domain, search); |
| |
| /* This would be simpler if we just called cp_lookup_nested_symbol |
| at this point. But that would require first looking up the containing |
| class/namespace. Since we're only searching static and global blocks |
| there's often no need to first do that lookup. */ |
| |
| is_in_anonymous |
| = the_namespace[0] != '\0' && cp_is_in_anonymous (the_namespace); |
| sym = cp_basic_lookup_symbol (name, block, domain, is_in_anonymous); |
| if (sym.symbol != NULL) |
| return sym; |
| |
| if (search) |
| sym = cp_search_static_and_baseclasses (name, block, domain, prefix_len, |
| is_in_anonymous); |
| |
| return sym; |
| } |
| |
| /* Search for NAME by applying all import statements belonging to |
| BLOCK which are applicable in SCOPE. If DECLARATION_ONLY the |
| search is restricted to using declarations. |
| Example: |
| |
| namespace A { |
| int x; |
| } |
| using A::x; |
| |
| If SEARCH_PARENTS the search will include imports which are |
| applicable in parents of SCOPE. |
| Example: |
| |
| namespace A { |
| using namespace X; |
| namespace B { |
| using namespace Y; |
| } |
| } |
| |
| If SCOPE is "A::B" and SEARCH_PARENTS is true the imports of |
| namespaces X and Y will be considered. If SEARCH_PARENTS is false |
| only the import of Y is considered. |
| |
| SEARCH_SCOPE_FIRST is an internal implementation detail: Callers must |
| pass 0 for it. Internally we pass 1 when recursing. */ |
| |
| static struct block_symbol |
| cp_lookup_symbol_via_imports (const char *scope, |
| const char *name, |
| const struct block *block, |
| const domain_enum domain, |
| const int search_scope_first, |
| const int declaration_only, |
| const int search_parents) |
| { |
| struct using_direct *current; |
| struct block_symbol sym = {}; |
| int len; |
| int directive_match; |
| |
| /* First, try to find the symbol in the given namespace if requested. */ |
| if (search_scope_first) |
| sym = cp_lookup_symbol_in_namespace (scope, name, |
| block, domain, 1); |
| |
| if (sym.symbol != NULL) |
| return sym; |
| |
| /* Go through the using directives. If any of them add new names to |
| the namespace we're searching in, see if we can find a match by |
| applying them. */ |
| |
| for (current = block_using (block); |
| current != NULL; |
| current = current->next) |
| { |
| const char **excludep; |
| |
| len = strlen (current->import_dest); |
| directive_match = (search_parents |
| ? (startswith (scope, current->import_dest) |
| && (len == 0 |
| || scope[len] == ':' |
| || scope[len] == '\0')) |
| : strcmp (scope, current->import_dest) == 0); |
| |
| /* If the import destination is the current scope or one of its |
| ancestors then it is applicable. */ |
| if (directive_match && !current->searched) |
| { |
| /* Mark this import as searched so that the recursive call |
| does not search it again. */ |
| scoped_restore reset_directive_searched |
| = make_scoped_restore (¤t->searched, 1); |
| |
| /* If there is an import of a single declaration, compare the |
| imported declaration (after optional renaming by its alias) |
| with the sought out name. If there is a match pass |
| current->import_src as NAMESPACE to direct the search |
| towards the imported namespace. */ |
| if (current->declaration |
| && strcmp (name, current->alias |
| ? current->alias : current->declaration) == 0) |
| sym = cp_lookup_symbol_in_namespace (current->import_src, |
| current->declaration, |
| block, domain, 1); |
| |
| /* If this is a DECLARATION_ONLY search or a symbol was found |
| or this import statement was an import declaration, the |
| search of this import is complete. */ |
| if (declaration_only || sym.symbol != NULL || current->declaration) |
| { |
| if (sym.symbol != NULL) |
| return sym; |
| |
| continue; |
| } |
| |
| /* Do not follow CURRENT if NAME matches its EXCLUDES. */ |
| for (excludep = current->excludes; *excludep; excludep++) |
| if (strcmp (name, *excludep) == 0) |
| break; |
| if (*excludep) |
| continue; |
| |
| if (current->alias != NULL |
| && strcmp (name, current->alias) == 0) |
| /* If the import is creating an alias and the alias matches |
| the sought name. Pass current->import_src as the NAME to |
| direct the search towards the aliased namespace. */ |
| { |
| sym = cp_lookup_symbol_in_namespace (scope, |
| current->import_src, |
| block, domain, 1); |
| } |
| else if (current->alias == NULL) |
| { |
| /* If this import statement creates no alias, pass |
| current->inner as NAMESPACE to direct the search |
| towards the imported namespace. */ |
| sym = cp_lookup_symbol_via_imports (current->import_src, |
| name, block, |
| domain, 1, 0, 0); |
| } |
| |
| if (sym.symbol != NULL) |
| return sym; |
| } |
| } |
| |
| return {}; |
| } |
| |
| /* Helper function that searches an array of symbols for one named NAME. */ |
| |
| static struct symbol * |
| search_symbol_list (const char *name, int num, |
| struct symbol **syms) |
| { |
| int i; |
| |
| /* Maybe we should store a dictionary in here instead. */ |
| for (i = 0; i < num; ++i) |
| { |
| if (strcmp (name, syms[i]->natural_name ()) == 0) |
| return syms[i]; |
| } |
| return NULL; |
| } |
| |
| /* Like cp_lookup_symbol_via_imports, but if BLOCK is a function, it |
| searches through the template parameters of the function and the |
| function's type. */ |
| |
| struct block_symbol |
| cp_lookup_symbol_imports_or_template (const char *scope, |
| const char *name, |
| const struct block *block, |
| const domain_enum domain) |
| { |
| struct symbol *function = BLOCK_FUNCTION (block); |
| struct block_symbol result; |
| |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_symbol_imports_or_template" |
| " (%s, %s, %s, %s)\n", |
| scope, name, host_address_to_string (block), |
| domain_name (domain)); |
| } |
| |
| if (function != NULL && function->language () == language_cplus) |
| { |
| /* Search the function's template parameters. */ |
| if (SYMBOL_IS_CPLUS_TEMPLATE_FUNCTION (function)) |
| { |
| struct template_symbol *templ |
| = (struct template_symbol *) function; |
| struct symbol *sym = search_symbol_list (name, |
| templ->n_template_arguments, |
| templ->template_arguments); |
| |
| if (sym != NULL) |
| { |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_symbol_imports_or_template" |
| " (...) = %s\n", |
| host_address_to_string (sym)); |
| } |
| return (struct block_symbol) {sym, block}; |
| } |
| } |
| |
| /* Search the template parameters of the function's defining |
| context. */ |
| if (function->natural_name ()) |
| { |
| struct type *context; |
| std::string name_copy (function->natural_name ()); |
| const struct language_defn *lang = language_def (language_cplus); |
| const struct block *parent = BLOCK_SUPERBLOCK (block); |
| struct symbol *sym; |
| |
| while (1) |
| { |
| unsigned int prefix_len |
| = cp_entire_prefix_len (name_copy.c_str ()); |
| |
| if (prefix_len == 0) |
| context = NULL; |
| else |
| { |
| name_copy.erase (prefix_len); |
| context = lookup_typename (lang, |
| name_copy.c_str (), |
| parent, 1); |
| } |
| |
| if (context == NULL) |
| break; |
| |
| sym |
| = search_symbol_list (name, |
| TYPE_N_TEMPLATE_ARGUMENTS (context), |
| TYPE_TEMPLATE_ARGUMENTS (context)); |
| if (sym != NULL) |
| { |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered |
| (gdb_stdlog, |
| "cp_lookup_symbol_imports_or_template (...) = %s\n", |
| host_address_to_string (sym)); |
| } |
| return (struct block_symbol) {sym, parent}; |
| } |
| } |
| } |
| } |
| |
| result = cp_lookup_symbol_via_imports (scope, name, block, domain, 0, 1, 1); |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_symbol_imports_or_template (...) = %s\n", |
| result.symbol != NULL |
| ? host_address_to_string (result.symbol) : "NULL"); |
| } |
| return result; |
| } |
| |
| /* Search for NAME by applying relevant import statements belonging to BLOCK |
| and its parents. SCOPE is the namespace scope of the context in which the |
| search is being evaluated. */ |
| |
| static struct block_symbol |
| cp_lookup_symbol_via_all_imports (const char *scope, const char *name, |
| const struct block *block, |
| const domain_enum domain) |
| { |
| struct block_symbol sym; |
| |
| while (block != NULL) |
| { |
| sym = cp_lookup_symbol_via_imports (scope, name, block, domain, 0, 0, 1); |
| if (sym.symbol) |
| return sym; |
| |
| block = BLOCK_SUPERBLOCK (block); |
| } |
| |
| return {}; |
| } |
| |
| /* Searches for NAME in the current namespace, and by applying |
| relevant import statements belonging to BLOCK and its parents. |
| SCOPE is the namespace scope of the context in which the search is |
| being evaluated. */ |
| |
| struct block_symbol |
| cp_lookup_symbol_namespace (const char *scope, |
| const char *name, |
| const struct block *block, |
| const domain_enum domain) |
| { |
| struct block_symbol sym; |
| |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_symbol_namespace (%s, %s, %s, %s)\n", |
| scope, name, host_address_to_string (block), |
| domain_name (domain)); |
| } |
| |
| /* First, try to find the symbol in the given namespace. */ |
| sym = cp_lookup_symbol_in_namespace (scope, name, block, domain, 1); |
| |
| /* Search for name in namespaces imported to this and parent blocks. */ |
| if (sym.symbol == NULL) |
| sym = cp_lookup_symbol_via_all_imports (scope, name, block, domain); |
| |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_symbol_namespace (...) = %s\n", |
| sym.symbol != NULL |
| ? host_address_to_string (sym.symbol) : "NULL"); |
| } |
| return sym; |
| } |
| |
| /* Lookup NAME at namespace scope (or, in C terms, in static and |
| global variables). SCOPE is the namespace that the current |
| function is defined within; only consider namespaces whose length |
| is at least SCOPE_LEN. Other arguments are as in |
| cp_lookup_symbol_nonlocal. |
| |
| For example, if we're within a function A::B::f and looking for a |
| symbol x, this will get called with NAME = "x", SCOPE = "A::B", and |
| SCOPE_LEN = 0. It then calls itself with NAME and SCOPE the same, |
| but with SCOPE_LEN = 1. And then it calls itself with NAME and |
| SCOPE the same, but with SCOPE_LEN = 4. This third call looks for |
| "A::B::x"; if it doesn't find it, then the second call looks for |
| "A::x", and if that call fails, then the first call looks for |
| "x". */ |
| |
| static struct block_symbol |
| lookup_namespace_scope (const struct language_defn *langdef, |
| const char *name, |
| const struct block *block, |
| const domain_enum domain, |
| const char *scope, |
| int scope_len) |
| { |
| char *the_namespace; |
| |
| if (scope[scope_len] != '\0') |
| { |
| /* Recursively search for names in child namespaces first. */ |
| |
| struct block_symbol sym; |
| int new_scope_len = scope_len; |
| |
| /* If the current scope is followed by "::", skip past that. */ |
| if (new_scope_len != 0) |
| { |
| gdb_assert (scope[new_scope_len] == ':'); |
| new_scope_len += 2; |
| } |
| new_scope_len += cp_find_first_component (scope + new_scope_len); |
| sym = lookup_namespace_scope (langdef, name, block, domain, |
| scope, new_scope_len); |
| if (sym.symbol != NULL) |
| return sym; |
| } |
| |
| /* Okay, we didn't find a match in our children, so look for the |
| name in the current namespace. |
| |
| If we there is no scope and we know we have a bare symbol, then short |
| circuit everything and call cp_lookup_bare_symbol directly. |
| This isn't an optimization, rather it allows us to pass LANGDEF which |
| is needed for primitive type lookup. The test doesn't have to be |
| perfect: if NAME is a bare symbol that our test doesn't catch (e.g., a |
| template symbol with "::" in the argument list) then |
| cp_lookup_symbol_in_namespace will catch it. */ |
| |
| if (scope_len == 0 && strchr (name, ':') == NULL) |
| return cp_lookup_bare_symbol (langdef, name, block, domain, 1); |
| |
| the_namespace = (char *) alloca (scope_len + 1); |
| strncpy (the_namespace, scope, scope_len); |
| the_namespace[scope_len] = '\0'; |
| return cp_lookup_symbol_in_namespace (the_namespace, name, |
| block, domain, 1); |
| } |
| |
| /* The C++-specific version of name lookup for static and global |
| names. This makes sure that names get looked for in all namespaces |
| that are in scope. NAME is the natural name of the symbol that |
| we're looking for, BLOCK is the block that we're searching within, |
| DOMAIN says what kind of symbols we're looking for. */ |
| |
| struct block_symbol |
| cp_lookup_symbol_nonlocal (const struct language_defn *langdef, |
| const char *name, |
| const struct block *block, |
| const domain_enum domain) |
| { |
| struct block_symbol sym; |
| const char *scope = block_scope (block); |
| |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_symbol_non_local" |
| " (%s, %s (scope %s), %s)\n", |
| name, host_address_to_string (block), scope, |
| domain_name (domain)); |
| } |
| |
| /* First, try to find the symbol in the given namespace, and all |
| containing namespaces. */ |
| sym = lookup_namespace_scope (langdef, name, block, domain, scope, 0); |
| |
| /* Search for name in namespaces imported to this and parent blocks. */ |
| if (sym.symbol == NULL) |
| sym = cp_lookup_symbol_via_all_imports (scope, name, block, domain); |
| |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_symbol_nonlocal (...) = %s\n", |
| (sym.symbol != NULL |
| ? host_address_to_string (sym.symbol) |
| : "NULL")); |
| } |
| return sym; |
| } |
| |
| /* Search through the base classes of PARENT_TYPE for a base class |
| named NAME and return its type. If not found, return NULL. */ |
| |
| struct type * |
| cp_find_type_baseclass_by_name (struct type *parent_type, const char *name) |
| { |
| int i; |
| |
| parent_type = check_typedef (parent_type); |
| for (i = 0; i < TYPE_N_BASECLASSES (parent_type); ++i) |
| { |
| struct type *type = check_typedef (TYPE_BASECLASS (parent_type, i)); |
| const char *base_name = TYPE_BASECLASS_NAME (parent_type, i); |
| |
| if (base_name == NULL) |
| continue; |
| |
| if (streq (base_name, name)) |
| return type; |
| |
| type = cp_find_type_baseclass_by_name (type, name); |
| if (type != NULL) |
| return type; |
| } |
| |
| return NULL; |
| } |
| |
| /* Search through the base classes of PARENT_TYPE for a symbol named |
| NAME in block BLOCK. */ |
| |
| static struct block_symbol |
| find_symbol_in_baseclass (struct type *parent_type, const char *name, |
| const struct block *block, const domain_enum domain, |
| int is_in_anonymous) |
| { |
| int i; |
| struct block_symbol sym = {}; |
| |
| for (i = 0; i < TYPE_N_BASECLASSES (parent_type); ++i) |
| { |
| struct type *base_type = TYPE_BASECLASS (parent_type, i); |
| const char *base_name = TYPE_BASECLASS_NAME (parent_type, i); |
| |
| if (base_name == NULL) |
| continue; |
| |
| std::string concatenated_name = std::string (base_name) + "::" + name; |
| |
| sym = cp_lookup_nested_symbol_1 (base_type, name, |
| concatenated_name.c_str (), |
| block, domain, 1, is_in_anonymous); |
| if (sym.symbol != NULL) |
| break; |
| } |
| |
| return sym; |
| } |
| |
| /* Helper function to look up NESTED_NAME in CONTAINER_TYPE and in DOMAIN |
| and within the context of BLOCK. |
| NESTED_NAME may have scope ("::"). |
| CONTAINER_TYPE needn't have been "check_typedef'd" yet. |
| CONCATENATED_NAME is the fully scoped spelling of NESTED_NAME, it is |
| passed as an argument so that callers can control how space for it is |
| allocated. |
| If BASIC_LOOKUP is non-zero then perform a basic lookup of |
| CONCATENATED_NAME. See cp_basic_lookup_symbol for details. |
| If IS_IN_ANONYMOUS is non-zero then CONCATENATED_NAME is in an anonymous |
| namespace. */ |
| |
| static struct block_symbol |
| cp_lookup_nested_symbol_1 (struct type *container_type, |
| const char *nested_name, |
| const char *concatenated_name, |
| const struct block *block, |
| const domain_enum domain, |
| int basic_lookup, int is_in_anonymous) |
| { |
| struct block_symbol sym; |
| |
| /* NOTE: carlton/2003-11-10: We don't treat C++ class members |
| of classes like, say, data or function members. Instead, |
| they're just represented by symbols whose names are |
| qualified by the name of the surrounding class. This is |
| just like members of namespaces; in particular, |
| cp_basic_lookup_symbol works when looking them up. */ |
| |
| if (basic_lookup) |
| { |
| sym = cp_basic_lookup_symbol (concatenated_name, block, domain, |
| is_in_anonymous); |
| if (sym.symbol != NULL) |
| return sym; |
| } |
| |
| /* Now search all static file-level symbols. We have to do this for things |
| like typedefs in the class. We do not try to guess any imported |
| namespace as even the fully specified namespace search is already not |
| C++ compliant and more assumptions could make it too magic. */ |
| |
| /* First search in this symtab, what we want is possibly there. */ |
| sym = lookup_symbol_in_static_block (concatenated_name, block, domain); |
| if (sym.symbol != NULL) |
| return sym; |
| |
| /* Nope. We now have to search all static blocks in all objfiles, |
| even if block != NULL, because there's no guarantees as to which |
| symtab the symbol we want is in. Except for symbols defined in |
| anonymous namespaces should be treated as local to a single file, |
| which we just searched. */ |
| if (!is_in_anonymous) |
| { |
| sym = lookup_static_symbol (concatenated_name, domain); |
| if (sym.symbol != NULL) |
| return sym; |
| } |
| |
| /* If this is a class with baseclasses, search them next. */ |
| container_type = check_typedef (container_type); |
| if (TYPE_N_BASECLASSES (container_type) > 0) |
| { |
| sym = find_symbol_in_baseclass (container_type, nested_name, block, |
| domain, is_in_anonymous); |
| if (sym.symbol != NULL) |
| return sym; |
| } |
| |
| return {}; |
| } |
| |
| /* Look up a symbol named NESTED_NAME that is nested inside the C++ |
| class or namespace given by PARENT_TYPE, from within the context |
| given by BLOCK, and in DOMAIN. |
| Return NULL if there is no such nested symbol. */ |
| |
| struct block_symbol |
| cp_lookup_nested_symbol (struct type *parent_type, |
| const char *nested_name, |
| const struct block *block, |
| const domain_enum domain) |
| { |
| /* type_name_or_error provides better error reporting using the |
| original type. */ |
| struct type *saved_parent_type = parent_type; |
| |
| parent_type = check_typedef (parent_type); |
| |
| if (symbol_lookup_debug) |
| { |
| const char *type_name = saved_parent_type->name (); |
| |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_nested_symbol (%s, %s, %s, %s)\n", |
| type_name != NULL ? type_name : "unnamed", |
| nested_name, host_address_to_string (block), |
| domain_name (domain)); |
| } |
| |
| switch (parent_type->code ()) |
| { |
| case TYPE_CODE_STRUCT: |
| case TYPE_CODE_NAMESPACE: |
| case TYPE_CODE_UNION: |
| case TYPE_CODE_ENUM: |
| /* NOTE: Handle modules here as well, because Fortran is re-using the C++ |
| specific code to lookup nested symbols in modules, by calling the |
| method lookup_symbol_nonlocal, which ends up here. */ |
| case TYPE_CODE_MODULE: |
| { |
| int size; |
| const char *parent_name = type_name_or_error (saved_parent_type); |
| struct block_symbol sym; |
| char *concatenated_name; |
| int is_in_anonymous; |
| |
| size = strlen (parent_name) + 2 + strlen (nested_name) + 1; |
| concatenated_name = (char *) alloca (size); |
| xsnprintf (concatenated_name, size, "%s::%s", |
| parent_name, nested_name); |
| is_in_anonymous = cp_is_in_anonymous (concatenated_name); |
| |
| sym = cp_lookup_nested_symbol_1 (parent_type, nested_name, |
| concatenated_name, block, domain, |
| 1, is_in_anonymous); |
| |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_nested_symbol (...) = %s\n", |
| (sym.symbol != NULL |
| ? host_address_to_string (sym.symbol) |
| : "NULL")); |
| } |
| return sym; |
| } |
| |
| case TYPE_CODE_FUNC: |
| case TYPE_CODE_METHOD: |
| if (symbol_lookup_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "cp_lookup_nested_symbol (...) = NULL" |
| " (func/method)\n"); |
| } |
| return {}; |
| |
| default: |
| internal_error (__FILE__, __LINE__, |
| _("cp_lookup_nested_symbol called " |
| "on a non-aggregate type.")); |
| } |
| } |
| |
| /* The C++-version of lookup_transparent_type. */ |
| |
| /* FIXME: carlton/2004-01-16: The problem that this is trying to |
| address is that, unfortunately, sometimes NAME is wrong: it may not |
| include the name of namespaces enclosing the type in question. |
| lookup_transparent_type gets called when the type in question |
| is a declaration, and we're trying to find its definition; but, for |
| declarations, our type name deduction mechanism doesn't work. |
| There's nothing we can do to fix this in general, I think, in the |
| absence of debug information about namespaces (I've filed PR |
| gdb/1511 about this); until such debug information becomes more |
| prevalent, one heuristic which sometimes looks is to search for the |
| definition in namespaces containing the current namespace. |
| |
| We should delete this functions once the appropriate debug |
| information becomes more widespread. (GCC 3.4 will be the first |
| released version of GCC with such information.) */ |
| |
| struct type * |
| cp_lookup_transparent_type (const char *name) |
| { |
| /* First, try the honest way of looking up the definition. */ |
| struct type *t = basic_lookup_transparent_type (name); |
| const char *scope; |
| |
| if (t != NULL) |
| return t; |
| |
| /* If that doesn't work and we're within a namespace, look there |
| instead. */ |
| scope = block_scope (get_selected_block (0)); |
| |
| if (scope[0] == '\0') |
| return NULL; |
| |
| return cp_lookup_transparent_type_loop (name, scope, 0); |
| } |
| |
| /* Lookup the type definition associated to NAME in namespaces/classes |
| containing SCOPE whose name is strictly longer than LENGTH. LENGTH |
| must be the index of the start of a component of SCOPE. */ |
| |
| static struct type * |
| cp_lookup_transparent_type_loop (const char *name, |
| const char *scope, |
| int length) |
| { |
| int scope_length = length + cp_find_first_component (scope + length); |
| char *full_name; |
| |
| /* If the current scope is followed by "::", look in the next |
| component. */ |
| if (scope[scope_length] == ':') |
| { |
| struct type *retval |
| = cp_lookup_transparent_type_loop (name, scope, |
| scope_length + 2); |
| |
| if (retval != NULL) |
| return retval; |
| } |
| |
| full_name = (char *) alloca (scope_length + 2 + strlen (name) + 1); |
| strncpy (full_name, scope, scope_length); |
| memcpy (full_name + scope_length, "::", 2); |
| strcpy (full_name + scope_length + 2, name); |
| |
| return basic_lookup_transparent_type (full_name); |
| } |
| |
| /* This used to do something but was removed when it became |
| obsolete. */ |
| |
| static void |
| maintenance_cplus_namespace (const char *args, int from_tty) |
| { |
| printf_unfiltered (_("The `maint namespace' command was removed.\n")); |
| } |
| |
| void _initialize_cp_namespace (); |
| void |
| _initialize_cp_namespace () |
| { |
| struct cmd_list_element *cmd; |
| |
| cmd = add_cmd ("namespace", class_maintenance, |
| maintenance_cplus_namespace, |
| _("Deprecated placeholder for removed functionality."), |
| &maint_cplus_cmd_list); |
| deprecate_cmd (cmd, NULL); |
| } |