| /* Helper routines for C++ support in GDB. |
| Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010 |
| 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 "gdb_assert.h" |
| #include "block.h" |
| #include "objfiles.h" |
| #include "gdbtypes.h" |
| #include "dictionary.h" |
| #include "command.h" |
| #include "frame.h" |
| #include "buildsym.h" |
| |
| static struct symbol *lookup_namespace_scope (const char *name, |
| const struct block *block, |
| const domain_enum domain, |
| const char *scope, |
| int scope_len); |
| |
| static struct symbol *lookup_symbol_file (const char *name, |
| const struct block *block, |
| const domain_enum domain, |
| int anonymous_namespace); |
| |
| static struct type *cp_lookup_transparent_type_loop (const char *name, |
| const char *scope, |
| int scope_len); |
| |
| static void initialize_namespace_symtab (struct objfile *objfile); |
| |
| static struct block *get_possible_namespace_block (struct objfile *objfile); |
| |
| static void free_namespace_block (struct symtab *symtab); |
| |
| static int check_possible_namespace_symbols_loop (const char *name, |
| int len, |
| struct objfile *objfile); |
| |
| static int check_one_possible_namespace_symbol (const char *name, |
| int len, |
| struct objfile *objfile); |
| |
| static struct symbol *lookup_possible_namespace_symbol (const char *name); |
| |
| static void maintenance_cplus_namespace (char *args, int from_tty); |
| |
| /* Check to see if SYMBOL refers to an object contained within an |
| anonymous namespace; if so, add an appropriate using directive. */ |
| |
| /* Optimize away strlen ("(anonymous namespace)"). */ |
| |
| #define ANONYMOUS_NAMESPACE_LEN 21 |
| |
| void |
| cp_scan_for_anonymous_namespaces (const struct symbol *symbol) |
| { |
| if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
| { |
| const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
| unsigned int previous_component; |
| unsigned int next_component; |
| const char *len; |
| |
| /* Start with a quick-and-dirty check for mention of "(anonymous |
| namespace)". */ |
| |
| if (!cp_is_anonymous (name)) |
| return; |
| |
| previous_component = 0; |
| next_component = cp_find_first_component (name + previous_component); |
| |
| while (name[next_component] == ':') |
| { |
| if ((next_component - previous_component) == ANONYMOUS_NAMESPACE_LEN |
| && strncmp (name + previous_component, |
| "(anonymous namespace)", |
| ANONYMOUS_NAMESPACE_LEN) == 0) |
| { |
| int dest_len = (previous_component == 0 ? 0 : previous_component - 2); |
| int src_len = next_component; |
| |
| char *dest = alloca (dest_len + 1); |
| char *src = 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. */ |
| cp_add_using_directive (dest, src, NULL, NULL, |
| &SYMBOL_SYMTAB (symbol)->objfile->objfile_obstack); |
| } |
| /* The "+ 2" is for the "::". */ |
| previous_component = next_component + 2; |
| next_component = (previous_component |
| + cp_find_first_component (name |
| + previous_component)); |
| } |
| } |
| } |
| |
| |
| /* Add a using directive to using_directives. If the using directive in |
| question has already been added, don't add it twice. |
| Create a new struct using_direct which imports the namespace SRC into the |
| scope DEST. ALIAS is the name of the imported namespace in the current |
| scope. If ALIAS is NULL then the namespace is known by its original name. |
| DECLARATION is the name if the imported varable if this is a declaration |
| import (Eg. using A::x), otherwise it is NULL. The arguments are copied |
| into newly allocated memory so they can be temporaries. */ |
| |
| void |
| cp_add_using_directive (const char *dest, |
| const char *src, |
| const char *alias, |
| const char *declaration, |
| struct obstack *obstack) |
| { |
| struct using_direct *current; |
| struct using_direct *new; |
| |
| /* Has it already been added? */ |
| |
| for (current = using_directives; current != NULL; current = current->next) |
| { |
| if (strcmp (current->import_src, src) == 0 |
| && strcmp (current->import_dest, dest) == 0 |
| && ((alias == NULL && current->alias == NULL) |
| || (alias != NULL && current->alias != NULL |
| && strcmp (alias, current->alias) == 0)) |
| && ((declaration == NULL && current->declaration == NULL) |
| || (declaration != NULL && current->declaration != NULL |
| && strcmp (declaration, current->declaration) == 0))) |
| return; |
| } |
| |
| new = OBSTACK_ZALLOC (obstack, struct using_direct); |
| |
| new->import_src = obsavestring (src, strlen (src), obstack); |
| new->import_dest = obsavestring (dest, strlen (dest), obstack); |
| |
| if (alias != NULL) |
| new->alias = obsavestring (alias, strlen (alias), obstack); |
| |
| if (declaration != NULL) |
| new->declaration = obsavestring (declaration, strlen (declaration), |
| obstack); |
| |
| new->next = using_directives; |
| using_directives = new; |
| } |
| |
| /* Record the namespace that the function defined by SYMBOL was |
| defined in, if necessary. BLOCK is the associated block; use |
| OBSTACK for allocation. */ |
| |
| void |
| cp_set_block_scope (const struct symbol *symbol, |
| struct block *block, |
| struct obstack *obstack, |
| const char *processing_current_prefix, |
| int processing_has_namespace_info) |
| { |
| if (processing_has_namespace_info) |
| { |
| block_set_scope |
| (block, obsavestring (processing_current_prefix, |
| strlen (processing_current_prefix), |
| obstack), |
| obstack); |
| } |
| else if (SYMBOL_DEMANGLED_NAME (symbol) != NULL) |
| { |
| /* Try to figure out the appropriate namespace from the |
| demangled name. */ |
| |
| /* FIXME: carlton/2003-04-15: If the function in question is |
| a method of a class, the name will actually include the |
| name of the class as well. This should be harmless, but |
| is a little unfortunate. */ |
| |
| const char *name = SYMBOL_DEMANGLED_NAME (symbol); |
| unsigned int prefix_len = cp_entire_prefix_len (name); |
| |
| block_set_scope (block, |
| obsavestring (name, prefix_len, obstack), |
| obstack); |
| } |
| } |
| |
| /* Test whether or not NAMESPACE looks like it mentions an anonymous |
| namespace; return nonzero if so. */ |
| |
| int |
| cp_is_anonymous (const char *namespace) |
| { |
| return (strstr (namespace, "(anonymous namespace)") |
| != NULL); |
| } |
| |
| /* 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, and if SYMTAB is |
| non-NULL, we should store the symtab where we found the symbol in it. */ |
| |
| struct symbol * |
| cp_lookup_symbol_nonlocal (const char *name, |
| const struct block *block, |
| const domain_enum domain) |
| { |
| struct symbol *sym; |
| const char *scope = block_scope (block); |
| |
| sym = lookup_namespace_scope (name, block, domain, scope, 0); |
| if (sym != NULL) |
| return sym; |
| |
| return cp_lookup_symbol_namespace (scope, name, block, domain); |
| } |
| |
| /* Look up NAME in the C++ namespace NAMESPACE. Other arguments are as in |
| cp_lookup_symbol_nonlocal. */ |
| |
| static struct symbol * |
| cp_lookup_symbol_in_namespace (const char *namespace, |
| const char *name, |
| const struct block *block, |
| const domain_enum domain) |
| { |
| if (namespace[0] == '\0') |
| { |
| return lookup_symbol_file (name, block, domain, 0); |
| } |
| else |
| { |
| char *concatenated_name = alloca (strlen (namespace) + 2 + |
| strlen (name+ 1)); |
| strcpy (concatenated_name, namespace); |
| strcat (concatenated_name, "::"); |
| strcat (concatenated_name, name); |
| return lookup_symbol_file (concatenated_name, block, |
| domain,cp_is_anonymous (namespace)); |
| } |
| } |
| |
| /* Used for cleanups to reset the "searched" flag incase |
| of an error. */ |
| |
| static void |
| reset_directive_searched (void *data) |
| { |
| struct using_direct *direct = data; |
| direct->searched = 0; |
| } |
| |
| /* 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. */ |
| |
| struct symbol * |
| cp_lookup_symbol_imports (const char *scope, |
| const char *name, |
| const struct block *block, |
| const domain_enum domain, |
| const int declaration_only, |
| const int search_parents) |
| { |
| struct using_direct *current; |
| struct symbol *sym = NULL; |
| int len; |
| int directive_match; |
| struct cleanup *searched_cleanup; |
| |
| /* First, try to find the symbol in the given namespace. */ |
| if (!declaration_only) |
| sym = cp_lookup_symbol_in_namespace (scope, name, block, domain); |
| |
| if (sym != 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) |
| { |
| len = strlen (current->import_dest); |
| directive_match = (search_parents |
| ? (strncmp (scope, current->import_dest, |
| strlen (current->import_dest)) == 0 |
| && (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. */ |
| current->searched = 1; |
| searched_cleanup = make_cleanup (reset_directive_searched, current); |
| |
| /* If there is an import of a single declaration, compare the imported |
| declaration 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->declaration) == 0) |
| sym = cp_lookup_symbol_in_namespace (current->import_src, |
| name, |
| block, |
| domain); |
| |
| /* 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 != NULL || current->declaration) |
| { |
| current->searched = 0; |
| discard_cleanups (searched_cleanup); |
| |
| if (sym != NULL) |
| return sym; |
| |
| 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); |
| } |
| 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_imports (current->import_src, |
| name, |
| block, |
| domain, |
| 0, |
| 0); |
| } |
| current->searched = 0; |
| discard_cleanups (searched_cleanup); |
| |
| if (sym != NULL) |
| return sym; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* 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 symbol* |
| cp_lookup_symbol_namespace (const char *scope, |
| const char *name, |
| const struct block *block, |
| const domain_enum domain) |
| { |
| struct symbol *sym; |
| |
| /* First, try to find the symbol in the given namespace. */ |
| sym = cp_lookup_symbol_in_namespace (scope, name, block, domain); |
| if (sym != NULL) |
| return sym; |
| |
| /* Search for name in namespaces imported to this and parent blocks. */ |
| while (block != NULL) |
| { |
| sym = cp_lookup_symbol_imports (scope, name, block, domain, 0, 1); |
| |
| if (sym) |
| return sym; |
| |
| block = BLOCK_SUPERBLOCK (block); |
| } |
| |
| return NULL; |
| } |
| |
| /* 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 symbol * |
| lookup_namespace_scope (const char *name, |
| const struct block *block, |
| const domain_enum domain, |
| const char *scope, |
| int scope_len) |
| { |
| char *namespace; |
| |
| if (scope[scope_len] != '\0') |
| { |
| /* Recursively search for names in child namespaces first. */ |
| |
| struct 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 (name, block, domain, scope, new_scope_len); |
| if (sym != NULL) |
| return sym; |
| } |
| |
| /* Okay, we didn't find a match in our children, so look for the |
| name in the current namespace. */ |
| |
| namespace = alloca (scope_len + 1); |
| strncpy (namespace, scope, scope_len); |
| namespace[scope_len] = '\0'; |
| return cp_lookup_symbol_in_namespace (namespace, name, block, domain); |
| } |
| |
| /* Look up NAME in BLOCK's static block and in global blocks. If |
| ANONYMOUS_NAMESPACE is nonzero, the symbol in question is located |
| within an anonymous namespace. Other arguments are as in |
| cp_lookup_symbol_nonlocal. */ |
| |
| static struct symbol * |
| lookup_symbol_file (const char *name, |
| const struct block *block, |
| const domain_enum domain, |
| int anonymous_namespace) |
| { |
| struct symbol *sym = NULL; |
| |
| sym = lookup_symbol_static (name, block, domain); |
| if (sym != NULL) |
| return sym; |
| |
| if (anonymous_namespace) |
| { |
| /* 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 = lookup_symbol_aux_block (name, global_block, domain); |
| } |
| else |
| { |
| sym = lookup_symbol_global (name, block, domain); |
| } |
| |
| if (sym != NULL) |
| return sym; |
| |
| /* Now call "lookup_possible_namespace_symbol". Symbols in here |
| claim to be associated to namespaces, but this claim might be |
| incorrect: the names in question might actually correspond to |
| classes instead of namespaces. But if they correspond to |
| classes, then we should have found a match for them above. So if |
| we find them now, they should be genuine. */ |
| |
| /* FIXME: carlton/2003-06-12: This is a hack and should eventually |
| be deleted: see comments below. */ |
| |
| if (domain == VAR_DOMAIN) |
| { |
| sym = lookup_possible_namespace_symbol (name); |
| if (sym != NULL) |
| return sym; |
| } |
| |
| return NULL; |
| } |
| |
| /* Look up a type named NESTED_NAME that is nested inside the C++ |
| class or namespace given by PARENT_TYPE, from within the context |
| given by BLOCK. Return NULL if there is no such nested type. */ |
| |
| struct type * |
| cp_lookup_nested_type (struct type *parent_type, |
| const char *nested_name, |
| const struct block *block) |
| { |
| switch (TYPE_CODE (parent_type)) |
| { |
| case TYPE_CODE_STRUCT: |
| case TYPE_CODE_NAMESPACE: |
| case TYPE_CODE_UNION: |
| { |
| /* 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, |
| lookup_symbol_namespace works when looking them up. */ |
| |
| const char *parent_name = TYPE_TAG_NAME (parent_type); |
| struct symbol *sym = cp_lookup_symbol_in_namespace (parent_name, |
| nested_name, |
| block, |
| VAR_DOMAIN); |
| if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF) |
| return NULL; |
| else |
| return SYMBOL_TYPE (sym); |
| } |
| default: |
| internal_error (__FILE__, __LINE__, |
| _("cp_lookup_nested_type 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 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 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 = alloca (scope_length + 2 + strlen (name) + 1); |
| strncpy (full_name, scope, scope_length); |
| strncpy (full_name + scope_length, "::", 2); |
| strcpy (full_name + scope_length + 2, name); |
| |
| return basic_lookup_transparent_type (full_name); |
| } |
| |
| /* Now come functions for dealing with symbols associated to |
| namespaces. (They're used to store the namespaces themselves, not |
| objects that live in the namespaces.) These symbols come in two |
| varieties: if we run into a DW_TAG_namespace DIE, then we know that |
| we have a namespace, so dwarf2read.c creates a symbol for it just |
| like normal. But, unfortunately, versions of GCC through at least |
| 3.3 don't generate those DIE's. Our solution is to try to guess |
| their existence by looking at demangled names. This might cause us |
| to misidentify classes as namespaces, however. So we put those |
| symbols in a special block (one per objfile), and we only search |
| that block as a last resort. */ |
| |
| /* FIXME: carlton/2003-06-12: Once versions of GCC that generate |
| DW_TAG_namespace have been out for a year or two, we should get rid |
| of all of this "possible namespace" nonsense. */ |
| |
| /* Allocate everything necessary for the possible namespace block |
| associated to OBJFILE. */ |
| |
| static void |
| initialize_namespace_symtab (struct objfile *objfile) |
| { |
| struct symtab *namespace_symtab; |
| struct blockvector *bv; |
| struct block *bl; |
| |
| namespace_symtab = allocate_symtab ("<<C++-namespaces>>", objfile); |
| namespace_symtab->language = language_cplus; |
| namespace_symtab->free_code = free_nothing; |
| namespace_symtab->dirname = NULL; |
| |
| bv = obstack_alloc (&objfile->objfile_obstack, |
| sizeof (struct blockvector) |
| + FIRST_LOCAL_BLOCK * sizeof (struct block *)); |
| BLOCKVECTOR_NBLOCKS (bv) = FIRST_LOCAL_BLOCK + 1; |
| BLOCKVECTOR (namespace_symtab) = bv; |
| |
| /* Allocate empty GLOBAL_BLOCK and STATIC_BLOCK. */ |
| |
| bl = allocate_block (&objfile->objfile_obstack); |
| BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, |
| NULL); |
| BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl; |
| bl = allocate_block (&objfile->objfile_obstack); |
| BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack, |
| NULL); |
| BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl; |
| |
| /* Allocate the possible namespace block; we put it where the first |
| local block will live, though I don't think there's any need to |
| pretend that it's actually a local block (e.g. by setting |
| BLOCK_SUPERBLOCK appropriately). We don't use the global or |
| static block because we don't want it searched during the normal |
| search of all global/static blocks in lookup_symbol: we only want |
| it used as a last resort. */ |
| |
| /* NOTE: carlton/2003-09-11: I considered not associating the fake |
| symbols to a block/symtab at all. But that would cause problems |
| with lookup_symbol's SYMTAB argument and with block_found, so |
| having a symtab/block for this purpose seems like the best |
| solution for now. */ |
| |
| bl = allocate_block (&objfile->objfile_obstack); |
| BLOCK_DICT (bl) = dict_create_hashed_expandable (); |
| BLOCKVECTOR_BLOCK (bv, FIRST_LOCAL_BLOCK) = bl; |
| |
| namespace_symtab->free_func = free_namespace_block; |
| |
| objfile->cp_namespace_symtab = namespace_symtab; |
| } |
| |
| /* Locate the possible namespace block associated to OBJFILE, |
| allocating it if necessary. */ |
| |
| static struct block * |
| get_possible_namespace_block (struct objfile *objfile) |
| { |
| if (objfile->cp_namespace_symtab == NULL) |
| initialize_namespace_symtab (objfile); |
| |
| return BLOCKVECTOR_BLOCK (BLOCKVECTOR (objfile->cp_namespace_symtab), |
| FIRST_LOCAL_BLOCK); |
| } |
| |
| /* Free the dictionary associated to the possible namespace block. */ |
| |
| static void |
| free_namespace_block (struct symtab *symtab) |
| { |
| struct block *possible_namespace_block; |
| |
| possible_namespace_block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), |
| FIRST_LOCAL_BLOCK); |
| gdb_assert (possible_namespace_block != NULL); |
| dict_free (BLOCK_DICT (possible_namespace_block)); |
| } |
| |
| /* Ensure that there are symbols in the possible namespace block |
| associated to OBJFILE for all initial substrings of NAME that look |
| like namespaces or classes. NAME should end in a member variable: |
| it shouldn't consist solely of namespaces. */ |
| |
| void |
| cp_check_possible_namespace_symbols (const char *name, struct objfile *objfile) |
| { |
| check_possible_namespace_symbols_loop (name, |
| cp_find_first_component (name), |
| objfile); |
| } |
| |
| /* This is a helper loop for cp_check_possible_namespace_symbols; it |
| ensures that there are symbols in the possible namespace block |
| associated to OBJFILE for all namespaces that are initial |
| substrings of NAME of length at least LEN. It returns 1 if a |
| previous loop had already created the shortest such symbol and 0 |
| otherwise. |
| |
| This function assumes that if there is already a symbol associated |
| to a substring of NAME of a given length, then there are already |
| symbols associated to all substrings of NAME whose length is less |
| than that length. So if cp_check_possible_namespace_symbols has |
| been called once with argument "A::B::C::member", then that will |
| create symbols "A", "A::B", and "A::B::C". If it is then later |
| called with argument "A::B::D::member", then the new call will |
| generate a new symbol for "A::B::D", but once it sees that "A::B" |
| has already been created, it doesn't bother checking to see if "A" |
| has also been created. */ |
| |
| static int |
| check_possible_namespace_symbols_loop (const char *name, int len, |
| struct objfile *objfile) |
| { |
| if (name[len] == ':') |
| { |
| int done; |
| int next_len = len + 2; |
| |
| next_len += cp_find_first_component (name + next_len); |
| done = check_possible_namespace_symbols_loop (name, next_len, |
| objfile); |
| |
| if (!done) |
| done = check_one_possible_namespace_symbol (name, len, objfile); |
| |
| return done; |
| } |
| else |
| return 0; |
| } |
| |
| /* Check to see if there's already a possible namespace symbol in |
| OBJFILE whose name is the initial substring of NAME of length LEN. |
| If not, create one and return 0; otherwise, return 1. */ |
| |
| static int |
| check_one_possible_namespace_symbol (const char *name, int len, |
| struct objfile *objfile) |
| { |
| struct block *block = get_possible_namespace_block (objfile); |
| char *name_copy = alloca (len + 1); |
| struct symbol *sym; |
| |
| memcpy (name_copy, name, len); |
| name_copy[len] = '\0'; |
| sym = lookup_block_symbol (block, name_copy, VAR_DOMAIN); |
| |
| if (sym == NULL) |
| { |
| struct type *type; |
| |
| type = init_type (TYPE_CODE_NAMESPACE, 0, 0, name_copy, objfile); |
| |
| TYPE_TAG_NAME (type) = TYPE_NAME (type); |
| |
| sym = obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); |
| memset (sym, 0, sizeof (struct symbol)); |
| SYMBOL_LANGUAGE (sym) = language_cplus; |
| /* Note that init_type copied the name to the objfile's |
| obstack. */ |
| SYMBOL_SET_NAMES (sym, TYPE_NAME (type), len, 0, objfile); |
| SYMBOL_CLASS (sym) = LOC_TYPEDEF; |
| SYMBOL_TYPE (sym) = type; |
| SYMBOL_DOMAIN (sym) = VAR_DOMAIN; |
| |
| dict_add_symbol (BLOCK_DICT (block), sym); |
| |
| return 0; |
| } |
| else |
| return 1; |
| } |
| |
| /* Look for a symbol named NAME in all the possible namespace blocks. |
| If one is found, return it. */ |
| |
| static struct symbol * |
| lookup_possible_namespace_symbol (const char *name) |
| { |
| struct objfile *objfile; |
| |
| ALL_OBJFILES (objfile) |
| { |
| struct symbol *sym; |
| |
| sym = lookup_block_symbol (get_possible_namespace_block (objfile), |
| name, VAR_DOMAIN); |
| |
| if (sym != NULL) |
| return sym; |
| } |
| |
| return NULL; |
| } |
| |
| /* Print out all the possible namespace symbols. */ |
| |
| static void |
| maintenance_cplus_namespace (char *args, int from_tty) |
| { |
| struct objfile *objfile; |
| printf_unfiltered (_("Possible namespaces:\n")); |
| ALL_OBJFILES (objfile) |
| { |
| struct dict_iterator iter; |
| struct symbol *sym; |
| |
| ALL_BLOCK_SYMBOLS (get_possible_namespace_block (objfile), iter, sym) |
| { |
| printf_unfiltered ("%s\n", SYMBOL_PRINT_NAME (sym)); |
| } |
| } |
| } |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| extern initialize_file_ftype _initialize_cp_namespace; |
| |
| void |
| _initialize_cp_namespace (void) |
| { |
| add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, |
| _("Print the list of possible C++ namespaces."), |
| &maint_cplus_cmd_list); |
| } |