1 /* Declarations for C++ name lookup routines.
2 Copyright (C) 2003, 2004 Free Software Foundation, Inc.
3 Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 #ifndef GCC_CP_NAME_LOOKUP_H
23 #define GCC_CP_NAME_LOOKUP_H
27 /* The type of dictionary used to map names to types declared at
29 typedef struct binding_table_s *binding_table;
30 typedef struct binding_entry_s *binding_entry;
32 /* The type of a routine repeatedly called by binding_table_foreach. */
33 typedef void (*bt_foreach_proc) (binding_entry, void *);
35 struct binding_entry_s GTY(())
42 /* These macros indicate the initial chains count for binding_table. */
43 #define SCOPE_DEFAULT_HT_SIZE (1 << 3)
44 #define CLASS_SCOPE_HT_SIZE (1 << 3)
45 #define NAMESPACE_ORDINARY_HT_SIZE (1 << 5)
46 #define NAMESPACE_STD_HT_SIZE (1 << 8)
47 #define GLOBAL_SCOPE_HT_SIZE (1 << 8)
49 extern void binding_table_remove_anonymous_types (binding_table);
50 extern void binding_table_foreach (binding_table, bt_foreach_proc, void *);
51 extern binding_entry binding_table_find (binding_table, tree);
52 extern void cxx_remember_type_decls (binding_table);
54 /* Datatype used to temporarily save C++ bindings (for implicit
55 instantiations purposes and like). Implemented in decl.c. */
56 typedef struct cxx_saved_binding cxx_saved_binding;
58 /* Datatype that represents binding established by a declaration between
59 a name and a C++ entity. */
60 typedef struct cxx_binding cxx_binding;
62 /* The datatype used to implement C++ scope. */
63 typedef struct cp_binding_level cxx_scope;
65 /* Nonzero if this binding is for a local scope, as opposed to a class
66 or namespace scope. */
67 #define LOCAL_BINDING_P(NODE) ((NODE)->is_local)
69 /* True if NODE->value is from a base class of the class which is
70 currently being defined. */
71 #define INHERITED_VALUE_BINDING_P(NODE) ((NODE)->value_is_inherited)
73 struct cxx_binding GTY(())
75 /* Link to chain together various bindings for this name. */
76 cxx_binding *previous;
77 /* The non-type entity this name is bound to. */
79 /* The type entity this name is bound to. */
81 /* The scope at which this binding was made. */
83 unsigned value_is_inherited : 1;
84 unsigned is_local : 1;
87 extern tree identifier_type_value (tree);
88 extern void set_identifier_type_value (tree, tree);
89 extern void pop_binding (tree, tree);
90 extern void clear_identifier_class_values (void);
91 extern tree constructor_name_full (tree);
92 extern tree constructor_name (tree);
93 extern bool constructor_name_p (tree, tree);
95 /* The kinds of scopes we recognize. */
96 typedef enum scope_kind {
97 sk_block = 0, /* An ordinary block scope. This enumerator must
98 have the value zero because "cp_binding_level"
99 is initialized by using "memset" to set the
100 contents to zero, and the default scope kind
102 sk_cleanup, /* A scope for (pseudo-)scope for cleanup. It is
103 peusdo in that it is transparent to name lookup
105 sk_try, /* A try-block. */
106 sk_catch, /* A catch-block. */
107 sk_for, /* The scope of the variable declared in a
108 for-init-statement. */
109 sk_function_parms, /* The scope containing function parameters. */
110 sk_class, /* The scope containing the members of a class. */
111 sk_namespace, /* The scope containing the members of a
112 namespace, including the global scope. */
113 sk_template_parms, /* A scope for template parameters. */
114 sk_template_spec /* Like sk_template_parms, but for an explicit
115 specialization. Since, by definition, an
116 explicit specialization is introduced by
117 "template <>", this scope is always empty. */
120 typedef struct cp_class_binding GTY(())
123 /* The bound name. */
127 DEF_VEC_O(cp_class_binding);
129 /* For each binding contour we allocate a binding_level structure
130 which records the names defined in that contour.
133 1) one for each function definition,
134 where internal declarations of the parameters appear.
135 2) one for each compound statement,
136 to record its declarations.
138 The current meaning of a name can be found by searching the levels
139 from the current one out to the global one.
141 Off to the side, may be the class_binding_level. This exists only
142 to catch class-local declarations. It is otherwise nonexistent.
144 Also there may be binding levels that catch cleanups that must be
145 run when exceptions occur. Thus, to see whether a name is bound in
146 the current scope, it is not enough to look in the
147 CURRENT_BINDING_LEVEL. You should use lookup_name_current_level
150 /* Note that the information in the `names' component of the global contour
151 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
153 struct cp_binding_level GTY(())
155 /* A chain of _DECL nodes for all variables, constants, functions,
156 and typedef types. These are in the reverse of the order
157 supplied. There may be OVERLOADs on this list, too, but they
158 are wrapped in TREE_LISTs; the TREE_VALUE is the OVERLOAD. */
161 /* Count of elements in names chain. */
164 /* A chain of NAMESPACE_DECL nodes. */
167 /* An array of static functions and variables (for namespaces only) */
168 varray_type static_decls;
170 /* A chain of VTABLE_DECL nodes. */
173 /* A dictionary for looking up user-defined-types. */
174 binding_table type_decls;
176 /* A list of USING_DECL nodes. */
179 /* A list of used namespaces. PURPOSE is the namespace,
180 VALUE the common ancestor with this binding_level's namespace. */
181 tree using_directives;
183 /* For the binding level corresponding to a class, the entities
184 declared in the class or its base classes. */
185 VEC(cp_class_binding) *class_shadowed;
187 /* Similar to class_shadowed, but for IDENTIFIER_TYPE_VALUE, and
188 is used for all binding levels. The TREE_PURPOSE is the name of
189 the entity, the TREE_TYPE is the associated type. In addition
190 the TREE_VALUE is the IDENTIFIER_TYPE_VALUE before we entered
194 /* A TREE_LIST. Each TREE_VALUE is the LABEL_DECL for a local
195 label in this scope. The TREE_PURPOSE is the previous value of
196 the IDENTIFIER_LABEL VALUE. */
197 tree shadowed_labels;
199 /* For each level (except not the global one),
200 a chain of BLOCK nodes for all the levels
201 that were entered and exited one level down. */
204 /* The entity (namespace, class, function) the scope of which this
205 binding contour corresponds to. Otherwise NULL. */
208 /* The binding level which this one is contained in (inherits from). */
209 struct cp_binding_level *level_chain;
211 /* List of VAR_DECLS saved from a previous for statement.
212 These would be dead in ISO-conforming code, but might
213 be referenced in ARM-era code. These are stored in a
214 TREE_LIST; the TREE_VALUE is the actual declaration. */
215 tree dead_vars_from_for;
217 /* STATEMENT_LIST for statements in this binding contour.
218 Only used at present for SK_CLEANUP temporary bindings. */
221 /* Binding depth at which this level began. */
224 /* The kind of scope that this object represents. However, a
225 SK_TEMPLATE_SPEC scope is represented with KIND set to
226 SK_TEMPALTE_PARMS and EXPLICIT_SPEC_P set to true. */
227 ENUM_BITFIELD (scope_kind) kind : 4;
229 /* True if this scope is an SK_TEMPLATE_SPEC scope. This field is
230 only valid if KIND == SK_TEMPLATE_PARMS. */
231 BOOL_BITFIELD explicit_spec_p : 1;
233 /* true means make a BLOCK for this level regardless of all else. */
236 /* Nonzero if this level can safely have additional
237 cleanup-needing variables added to it. */
238 unsigned more_cleanups_ok : 1;
239 unsigned have_cleanups : 1;
241 /* 22 bits left to fill a 32-bit word. */
244 /* The binding level currently in effect. */
246 #define current_binding_level \
247 (*(cfun && cp_function_chain->bindings \
248 ? &cp_function_chain->bindings \
249 : &scope_chain->bindings))
251 /* The binding level of the current class, if any. */
253 #define class_binding_level scope_chain->class_bindings
255 /* The tree node representing the global scope. */
256 extern GTY(()) tree global_namespace;
257 extern GTY(()) tree global_scope_name;
259 /* Indicates that there is a type value in some namespace, although
260 that is not necessarily in scope at the moment. */
262 extern GTY(()) tree global_type_node;
264 /* True if SCOPE designates the global scope binding contour. */
265 #define global_scope_p(SCOPE) \
266 ((SCOPE) == NAMESPACE_LEVEL (global_namespace))
268 extern cxx_scope *leave_scope (void);
269 extern bool kept_level_p (void);
270 extern int global_bindings_p (void);
271 extern bool toplevel_bindings_p (void);
272 extern bool namespace_bindings_p (void);
273 extern bool template_parm_scope_p (void);
274 extern scope_kind innermost_scope_kind (void);
275 extern cxx_scope *begin_scope (scope_kind, tree);
276 extern void print_binding_stack (void);
277 extern void print_binding_level (cxx_scope *);
278 extern void push_to_top_level (void);
279 extern void pop_from_top_level (void);
280 extern void pop_everything (void);
281 extern void keep_next_level (bool);
282 extern bool is_ancestor (tree, tree);
283 extern bool push_scope (tree);
284 extern void pop_scope (tree);
285 extern void push_binding_level (struct cp_binding_level *);
287 extern void push_namespace (tree);
288 extern void pop_namespace (void);
289 extern void push_nested_namespace (tree);
290 extern void pop_nested_namespace (tree);
291 extern void pushlevel_class (void);
292 extern void poplevel_class (void);
293 extern tree pushdecl_with_scope (tree, cxx_scope *);
294 extern tree lookup_tag (enum tree_code, tree, cxx_scope *, int);
295 extern tree lookup_tag_reverse (tree, tree);
296 extern tree lookup_name (tree, int);
297 extern tree lookup_name_real (tree, int, int, int, int);
298 extern tree namespace_binding (tree, tree);
299 extern void set_namespace_binding (tree, tree, tree);
300 extern tree lookup_namespace_name (tree, tree);
301 extern tree lookup_qualified_name (tree, tree, bool, bool);
302 extern tree lookup_name_nonclass (tree);
303 extern tree lookup_function_nonclass (tree, tree);
304 extern void push_local_binding (tree, tree, int);
305 extern int push_class_binding (tree, tree);
306 extern bool pushdecl_class_level (tree);
307 extern tree pushdecl_namespace_level (tree);
308 extern bool push_class_level_binding (tree, tree);
309 extern void storetags (tree);
310 extern tree getdecls (void);
311 extern tree cp_namespace_decls (tree);
312 extern void set_decl_namespace (tree, tree, bool);
313 extern tree current_decl_namespace (void);
314 extern void push_decl_namespace (tree);
315 extern void pop_decl_namespace (void);
316 extern void do_namespace_alias (tree, tree);
317 extern void do_toplevel_using_decl (tree, tree, tree);
318 extern void do_local_using_decl (tree, tree, tree);
319 extern tree do_class_using_decl (tree);
320 extern void do_using_directive (tree);
321 extern tree lookup_arg_dependent (tree, tree, tree);
322 extern bool is_associated_namespace (tree, tree);
323 extern void parse_using_directive (tree, tree);
326 /* Set *DECL to the (non-hidden) declaration for ID at global scope,
327 if present and return true; otherwise return false. */
330 get_global_value_if_present (tree id, tree *decl)
332 tree global_value = namespace_binding (id, global_namespace);
334 *decl = global_value;
335 return global_value != NULL;
338 /* True is the binding of IDENTIFIER at global scope names a type. */
341 is_typename_at_global_scope (tree id)
343 tree global_value = namespace_binding (id, global_namespace);
345 return global_value && TREE_CODE (global_value) == TYPE_DECL;
348 #endif /* GCC_CP_NAME_LOOKUP_H */