| /* Helper routines for C++ support in GDB. |
| Copyright 2003, 2004 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" |
| #include "objfiles.h" |
| #include "gdbtypes.h" |
| #include "dictionary.h" |
| #include "command.h" |
| #include "frame.h" |
| |
| /* When set, the file that we're processing is known to have debugging |
| info for C++ namespaces. */ |
| |
| /* NOTE: carlton/2004-01-13: No currently released version of GCC (the |
| latest of which is 3.3.x at the time of this writing) produces this |
| debug info. GCC 3.4 should, however. */ |
| |
| unsigned char processing_has_namespace_info; |
| |
| /* This contains our best guess as to the name of the current |
| enclosing namespace(s)/class(es), if any. For example, if we're |
| within the method foo() in the following code: |
| |
| namespace N { |
| class C { |
| void foo () { |
| } |
| }; |
| } |
| |
| then processing_current_prefix should be set to "N::C". If |
| processing_has_namespace_info is false, then this variable might |
| not be reliable. */ |
| |
| const char *processing_current_prefix; |
| |
| /* 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); |
| |
| 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, |
| struct symtab **symtab); |
| |
| static void maintenance_cplus_namespace (char *args, int from_tty); |
| |
| /* 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_prefix, |
| strlen (processing_current_prefix), |
| 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 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 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) |
| sym = lookup_symbol_aux_block (name, linkage_name, global_block, |
| domain, symtab); |
| } |
| else |
| { |
| sym = lookup_symbol_global (name, linkage_name, domain, symtab); |
| } |
| |
| 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, symtab); |
| 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: |
| { |
| /* 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_namespace (parent_name, |
| nested_name, |
| NULL, |
| block, |
| VAR_DOMAIN, |
| NULL); |
| 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, NULL, VAR_DOMAIN); |
| |
| if (sym == NULL) |
| { |
| struct type *type; |
| name_copy = obsavestring (name, len, &objfile->objfile_obstack); |
| |
| 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; |
| SYMBOL_SET_NAMES (sym, name_copy, len, 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; if SYMTAB is non-NULL, set *SYMTAB to |
| equal the symtab where it was found. */ |
| |
| static struct symbol * |
| lookup_possible_namespace_symbol (const char *name, struct symtab **symtab) |
| { |
| struct objfile *objfile; |
| |
| ALL_OBJFILES (objfile) |
| { |
| struct symbol *sym; |
| |
| sym = lookup_block_symbol (get_possible_namespace_block (objfile), |
| name, NULL, VAR_DOMAIN); |
| |
| if (sym != NULL) |
| { |
| if (symtab != NULL) |
| *symtab = objfile->cp_namespace_symtab; |
| |
| 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)); |
| } |
| } |
| } |
| |
| void |
| _initialize_cp_namespace (void) |
| { |
| add_cmd ("namespace", class_maintenance, maintenance_cplus_namespace, |
| "Print the list of possible C++ namespaces.", |
| &maint_cplus_cmd_list); |
| } |