| /* Helper routines for C++ support in GDB. |
| Copyright 2003 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 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "cp-support.h" |
| #include "gdb_obstack.h" |
| #include "symtab.h" |
| #include "symfile.h" |
| #include "gdb_assert.h" |
| #include "block.h" |
| |
| /* When set, the file that we're processing seems to have debugging |
| info for C++ namespaces, so cp-namespace.c shouldn't try to guess |
| namespace info itself. */ |
| |
| unsigned char processing_has_namespace_info; |
| |
| /* If processing_has_namespace_info is nonzero, this string should |
| contain the name of the current namespace. The string is |
| temporary; copy it if you need it. */ |
| |
| const char *processing_current_namespace; |
| |
| /* List of using directives that are active in the current file. */ |
| |
| static struct using_direct *using_list; |
| |
| static struct using_direct *cp_add_using (const char *name, |
| unsigned int inner_len, |
| unsigned int outer_len, |
| struct using_direct *next); |
| |
| static struct using_direct *cp_copy_usings (struct using_direct *using, |
| struct obstack *obstack); |
| |
| static struct symbol *lookup_namespace_scope (const char *name, |
| const char *linkage_name, |
| const struct block *block, |
| const domain_enum domain, |
| struct symtab **symtab, |
| const char *scope, |
| int scope_len); |
| |
| static struct symbol *lookup_symbol_file (const char *name, |
| const char *linkage_name, |
| const struct block *block, |
| const domain_enum domain, |
| struct symtab **symtab, |
| int anonymous_namespace); |
| |
| /* Set up support for dealing with C++ namespace info in the current |
| symtab. */ |
| |
| void cp_initialize_namespace () |
| { |
| processing_has_namespace_info = 0; |
| using_list = NULL; |
| } |
| |
| /* Add all the using directives we've gathered to the current symtab. |
| STATIC_BLOCK should be the symtab's static block; OBSTACK is used |
| for allocation. */ |
| |
| void |
| cp_finalize_namespace (struct block *static_block, |
| struct obstack *obstack) |
| { |
| if (using_list != NULL) |
| { |
| block_set_using (static_block, |
| cp_copy_usings (using_list, obstack), |
| obstack); |
| using_list = NULL; |
| } |
| } |
| |
| /* 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 (!processing_has_namespace_info |
| && SYMBOL_CPLUS_DEMANGLED_NAME (symbol) != NULL) |
| { |
| const char *name = SYMBOL_CPLUS_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) |
| { |
| /* 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 (name, |
| previous_component == 0 |
| ? 0 : previous_component - 2, |
| next_component); |
| } |
| /* 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_list. NAME is the start of a string |
| that should contain the namespaces we want to add as initial |
| substrings, OUTER_LENGTH is the end of the outer namespace, and |
| INNER_LENGTH is the end of the inner namespace. If the using |
| directive in question has already been added, don't add it |
| twice. */ |
| |
| void |
| cp_add_using_directive (const char *name, unsigned int outer_length, |
| unsigned int inner_length) |
| { |
| struct using_direct *current; |
| struct using_direct *new; |
| |
| /* Has it already been added? */ |
| |
| for (current = using_list; current != NULL; current = current->next) |
| { |
| if ((strncmp (current->inner, name, inner_length) == 0) |
| && (strlen (current->inner) == inner_length) |
| && (strlen (current->outer) == outer_length)) |
| return; |
| } |
| |
| using_list = cp_add_using (name, inner_length, outer_length, |
| using_list); |
| } |
| |
| /* 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) |
| { |
| /* Make sure that the name was originally mangled: if not, there |
| certainly isn't any namespace information to worry about! */ |
| |
| if (SYMBOL_CPLUS_DEMANGLED_NAME (symbol) != NULL) |
| { |
| if (processing_has_namespace_info) |
| { |
| block_set_scope |
| (block, obsavestring (processing_current_namespace, |
| strlen (processing_current_namespace), |
| obstack), |
| obstack); |
| } |
| else |
| { |
| /* 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_CPLUS_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); |
| } |
| |
| /* Create a new struct using direct whose inner namespace is the |
| initial substring of NAME of leng INNER_LEN and whose outer |
| namespace is the initial substring of NAME of length OUTER_LENGTH. |
| Set its next member in the linked list to NEXT; allocate all memory |
| using xmalloc. It copies the strings, so NAME can be a temporary |
| string. */ |
| |
| static struct using_direct * |
| cp_add_using (const char *name, |
| unsigned int inner_len, |
| unsigned int outer_len, |
| struct using_direct *next) |
| { |
| struct using_direct *retval; |
| |
| gdb_assert (outer_len < inner_len); |
| |
| retval = xmalloc (sizeof (struct using_direct)); |
| retval->inner = savestring (name, inner_len); |
| retval->outer = savestring (name, outer_len); |
| retval->next = next; |
| |
| return retval; |
| } |
| |
| /* Make a copy of the using directives in the list pointed to by |
| USING, using OBSTACK to allocate memory. Free all memory pointed |
| to by USING via xfree. */ |
| |
| static struct using_direct * |
| cp_copy_usings (struct using_direct *using, |
| struct obstack *obstack) |
| { |
| if (using == NULL) |
| { |
| return NULL; |
| } |
| else |
| { |
| struct using_direct *retval |
| = obstack_alloc (obstack, sizeof (struct using_direct)); |
| retval->inner = obsavestring (using->inner, strlen (using->inner), |
| obstack); |
| retval->outer = obsavestring (using->outer, strlen (using->outer), |
| obstack); |
| retval->next = cp_copy_usings (using->next, obstack); |
| |
| xfree (using->inner); |
| xfree (using->outer); |
| xfree (using); |
| |
| return retval; |
| } |
| } |
| |
| /* 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, LINKAGE_NAME (which is optional) is its linkage |
| name, 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 char *linkage_name, |
| const struct block *block, |
| const domain_enum domain, |
| struct symtab **symtab) |
| { |
| return lookup_namespace_scope (name, linkage_name, block, domain, |
| symtab, block_scope (block), 0); |
| } |
| |
| /* 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 f, this will get called with NAME = "f", 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 char *linkage_name, |
| const struct block *block, |
| const domain_enum domain, |
| struct symtab **symtab, |
| 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, linkage_name, block, |
| domain, symtab, |
| 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_namespace (namespace, name, linkage_name, |
| block, domain, symtab); |
| } |
| |
| /* Look up NAME in the C++ namespace NAMESPACE, applying the using |
| directives that are active in BLOCK. Other arguments are as in |
| cp_lookup_symbol_nonlocal. */ |
| |
| struct symbol * |
| cp_lookup_symbol_namespace (const char *namespace, |
| const char *name, |
| const char *linkage_name, |
| const struct block *block, |
| const domain_enum domain, |
| struct symtab **symtab) |
| { |
| const struct using_direct *current; |
| struct symbol *sym; |
| |
| /* First, 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) |
| { |
| if (strcmp (namespace, current->outer) == 0) |
| { |
| sym = cp_lookup_symbol_namespace (current->inner, |
| name, |
| linkage_name, |
| block, |
| domain, |
| symtab); |
| if (sym != NULL) |
| return sym; |
| } |
| } |
| |
| /* We didn't find anything by applying any of the using directives |
| that are still applicable; so let's see if we've got a match |
| using the current namespace. */ |
| |
| if (namespace[0] == '\0') |
| { |
| return lookup_symbol_file (name, linkage_name, block, |
| domain, symtab, 0); |
| } |
| else |
| { |
| char *concatenated_name |
| = alloca (strlen (namespace) + 2 + strlen (name) + 1); |
| strcpy (concatenated_name, namespace); |
| strcat (concatenated_name, "::"); |
| strcat (concatenated_name, name); |
| sym = lookup_symbol_file (concatenated_name, linkage_name, |
| block, domain, symtab, |
| cp_is_anonymous (namespace)); |
| return sym; |
| } |
| } |
| |
| /* 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 char *linkage_name, |
| const struct block *block, |
| const domain_enum domain, |
| struct symtab **symtab, |
| int anonymous_namespace) |
| { |
| struct symbol *sym = NULL; |
| |
| sym = lookup_symbol_static (name, linkage_name, block, domain, symtab); |
| 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) |
| return lookup_symbol_aux_block (name, linkage_name, global_block, |
| domain, symtab); |
| else |
| return NULL; |
| } |
| else |
| { |
| return lookup_symbol_global (name, linkage_name, domain, symtab); |
| } |
| } |