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 that represents binding established by a declaration between
55 a name and a C++ entity. */
56 typedef struct cxx_binding cxx_binding;
58 /* The datatype used to implement C++ scope. */
59 typedef struct cp_binding_level cxx_scope;
61 /* Nonzero if this binding is for a local scope, as opposed to a class
62 or namespace scope. */
63 #define LOCAL_BINDING_P(NODE) ((NODE)->is_local)
65 /* True if NODE->value is from a base class of the class which is
66 currently being defined. */
67 #define INHERITED_VALUE_BINDING_P(NODE) ((NODE)->value_is_inherited)
69 struct cxx_binding GTY(())
71 /* Link to chain together various bindings for this name. */
72 cxx_binding *previous;
73 /* The non-type entity this name is bound to. */
75 /* The type entity this name is bound to. */
77 /* The scope at which this binding was made. */
79 unsigned value_is_inherited : 1;
80 unsigned is_local : 1;
83 /* Datatype used to temporarily save C++ bindings (for implicit
84 instantiations purposes and like). Implemented in decl.c. */
85 typedef struct cxx_saved_binding GTY(())
87 /* The name of the current binding. */
89 /* The binding we're saving. */
94 DEF_VEC_GC_O(cxx_saved_binding);
96 extern tree identifier_type_value (tree);
97 extern void set_identifier_type_value (tree, tree);
98 extern void pop_binding (tree, tree);
99 extern tree constructor_name_full (tree);
100 extern tree constructor_name (tree);
101 extern bool constructor_name_p (tree, tree);
103 /* The kinds of scopes we recognize. */
104 typedef enum scope_kind {
105 sk_block = 0, /* An ordinary block scope. This enumerator must
106 have the value zero because "cp_binding_level"
107 is initialized by using "memset" to set the
108 contents to zero, and the default scope kind
110 sk_cleanup, /* A scope for (pseudo-)scope for cleanup. It is
111 peusdo in that it is transparent to name lookup
113 sk_try, /* A try-block. */
114 sk_catch, /* A catch-block. */
115 sk_for, /* The scope of the variable declared in a
116 for-init-statement. */
117 sk_function_parms, /* The scope containing function parameters. */
118 sk_class, /* The scope containing the members of a class. */
119 sk_namespace, /* The scope containing the members of a
120 namespace, including the global scope. */
121 sk_template_parms, /* A scope for template parameters. */
122 sk_template_spec /* Like sk_template_parms, but for an explicit
123 specialization. Since, by definition, an
124 explicit specialization is introduced by
125 "template <>", this scope is always empty. */
128 /* The scope where the class/struct/union/enum tag applies. */
129 typedef enum tag_scope {
130 ts_current = 0, /* Current scope only. This is for the
131 class-key identifier;
132 case mentioned in [basic.lookup.elab]/2,
133 or the class/enum definition
134 class-key identifier { ... }; */
135 ts_global = 1, /* All scopes. This is the 3.4.1
136 [basic.lookup.unqual] lookup mentioned
137 in [basic.lookup.elab]/2. */
138 ts_within_enclosing_non_class = 2 /* Search within enclosing non-class
139 only, for friend class lookup
140 according to [namespace.memdef]/3
141 and [class.friend]/9. */
144 typedef struct cp_class_binding GTY(())
147 /* The bound name. */
151 DEF_VEC_GC_O(cp_class_binding);
153 /* For each binding contour we allocate a binding_level structure
154 which records the names defined in that contour.
157 1) one for each function definition,
158 where internal declarations of the parameters appear.
159 2) one for each compound statement,
160 to record its declarations.
162 The current meaning of a name can be found by searching the levels
163 from the current one out to the global one.
165 Off to the side, may be the class_binding_level. This exists only
166 to catch class-local declarations. It is otherwise nonexistent.
168 Also there may be binding levels that catch cleanups that must be
169 run when exceptions occur. Thus, to see whether a name is bound in
170 the current scope, it is not enough to look in the
171 CURRENT_BINDING_LEVEL. You should use lookup_name_current_level
174 /* Note that the information in the `names' component of the global contour
175 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
177 struct cp_binding_level GTY(())
179 /* A chain of _DECL nodes for all variables, constants, functions,
180 and typedef types. These are in the reverse of the order
181 supplied. There may be OVERLOADs on this list, too, but they
182 are wrapped in TREE_LISTs; the TREE_VALUE is the OVERLOAD. */
185 /* Count of elements in names chain. */
188 /* A chain of NAMESPACE_DECL nodes. */
191 /* An array of static functions and variables (for namespaces only) */
192 varray_type static_decls;
194 /* A chain of VTABLE_DECL nodes. */
197 /* A dictionary for looking up user-defined-types. */
198 binding_table type_decls;
200 /* A list of USING_DECL nodes. */
203 /* A list of used namespaces. PURPOSE is the namespace,
204 VALUE the common ancestor with this binding_level's namespace. */
205 tree using_directives;
207 /* For the binding level corresponding to a class, the entities
208 declared in the class or its base classes. */
209 VEC(cp_class_binding) *class_shadowed;
211 /* Similar to class_shadowed, but for IDENTIFIER_TYPE_VALUE, and
212 is used for all binding levels. The TREE_PURPOSE is the name of
213 the entity, the TREE_TYPE is the associated type. In addition
214 the TREE_VALUE is the IDENTIFIER_TYPE_VALUE before we entered
218 /* A TREE_LIST. Each TREE_VALUE is the LABEL_DECL for a local
219 label in this scope. The TREE_PURPOSE is the previous value of
220 the IDENTIFIER_LABEL VALUE. */
221 tree shadowed_labels;
223 /* For each level (except not the global one),
224 a chain of BLOCK nodes for all the levels
225 that were entered and exited one level down. */
228 /* The entity (namespace, class, function) the scope of which this
229 binding contour corresponds to. Otherwise NULL. */
232 /* The binding level which this one is contained in (inherits from). */
233 struct cp_binding_level *level_chain;
235 /* List of VAR_DECLS saved from a previous for statement.
236 These would be dead in ISO-conforming code, but might
237 be referenced in ARM-era code. These are stored in a
238 TREE_LIST; the TREE_VALUE is the actual declaration. */
239 tree dead_vars_from_for;
241 /* STATEMENT_LIST for statements in this binding contour.
242 Only used at present for SK_CLEANUP temporary bindings. */
245 /* Binding depth at which this level began. */
248 /* The kind of scope that this object represents. However, a
249 SK_TEMPLATE_SPEC scope is represented with KIND set to
250 SK_TEMPLATE_PARMS and EXPLICIT_SPEC_P set to true. */
251 ENUM_BITFIELD (scope_kind) kind : 4;
253 /* True if this scope is an SK_TEMPLATE_SPEC scope. This field is
254 only valid if KIND == SK_TEMPLATE_PARMS. */
255 BOOL_BITFIELD explicit_spec_p : 1;
257 /* true means make a BLOCK for this level regardless of all else. */
260 /* Nonzero if this level can safely have additional
261 cleanup-needing variables added to it. */
262 unsigned more_cleanups_ok : 1;
263 unsigned have_cleanups : 1;
265 /* 22 bits left to fill a 32-bit word. */
268 /* The binding level currently in effect. */
270 #define current_binding_level \
271 (*(cfun && cp_function_chain->bindings \
272 ? &cp_function_chain->bindings \
273 : &scope_chain->bindings))
275 /* The binding level of the current class, if any. */
277 #define class_binding_level scope_chain->class_bindings
279 /* The tree node representing the global scope. */
280 extern GTY(()) tree global_namespace;
281 extern GTY(()) tree global_scope_name;
283 /* Indicates that there is a type value in some namespace, although
284 that is not necessarily in scope at the moment. */
286 extern GTY(()) tree global_type_node;
288 /* True if SCOPE designates the global scope binding contour. */
289 #define global_scope_p(SCOPE) \
290 ((SCOPE) == NAMESPACE_LEVEL (global_namespace))
292 extern cxx_scope *leave_scope (void);
293 extern bool kept_level_p (void);
294 extern int global_bindings_p (void);
295 extern bool toplevel_bindings_p (void);
296 extern bool namespace_bindings_p (void);
297 extern bool template_parm_scope_p (void);
298 extern scope_kind innermost_scope_kind (void);
299 extern cxx_scope *begin_scope (scope_kind, tree);
300 extern void print_binding_stack (void);
301 extern void print_binding_level (cxx_scope *);
302 extern void push_to_top_level (void);
303 extern void pop_from_top_level (void);
304 extern void pop_everything (void);
305 extern void keep_next_level (bool);
306 extern bool is_ancestor (tree, tree);
307 extern bool push_scope (tree);
308 extern void pop_scope (tree);
309 extern tree push_inner_scope (tree);
310 extern void pop_inner_scope (tree, tree);
311 extern void push_binding_level (struct cp_binding_level *);
313 extern void push_namespace (tree);
314 extern void pop_namespace (void);
315 extern void push_nested_namespace (tree);
316 extern void pop_nested_namespace (tree);
317 extern void pushlevel_class (void);
318 extern void poplevel_class (void);
319 extern tree pushdecl_with_scope (tree, cxx_scope *);
320 extern tree lookup_tag (enum tree_code, tree, cxx_scope *, int);
321 extern tree lookup_tag_reverse (tree, tree);
322 extern tree lookup_name (tree, int);
323 extern tree lookup_name_real (tree, int, int, bool, int, int);
324 extern tree lookup_type_scope (tree, tag_scope);
325 extern tree namespace_binding (tree, tree);
326 extern void set_namespace_binding (tree, tree, tree);
327 extern tree lookup_namespace_name (tree, tree);
328 extern tree lookup_qualified_name (tree, tree, bool, bool);
329 extern tree lookup_name_nonclass (tree);
330 extern tree lookup_function_nonclass (tree, tree, bool);
331 extern void push_local_binding (tree, tree, int);
332 extern bool pushdecl_class_level (tree);
333 extern tree pushdecl_namespace_level (tree);
334 extern bool push_class_level_binding (tree, tree);
335 extern void storetags (tree);
336 extern tree getdecls (void);
337 extern tree cp_namespace_decls (tree);
338 extern void set_decl_namespace (tree, tree, bool);
339 extern tree current_decl_namespace (void);
340 extern void push_decl_namespace (tree);
341 extern void pop_decl_namespace (void);
342 extern void do_namespace_alias (tree, tree);
343 extern void do_toplevel_using_decl (tree, tree, tree);
344 extern void do_local_using_decl (tree, tree, tree);
345 extern tree do_class_using_decl (tree);
346 extern void do_using_directive (tree);
347 extern tree lookup_arg_dependent (tree, tree, tree);
348 extern bool is_associated_namespace (tree, tree);
349 extern void parse_using_directive (tree, tree);
350 extern tree innermost_non_namespace_value (tree);
351 extern cxx_binding *outer_binding (tree, cxx_binding *, bool);
353 /* Set *DECL to the (non-hidden) declaration for ID at global scope,
354 if present and return true; otherwise return false. */
357 get_global_value_if_present (tree id, tree *decl)
359 tree global_value = namespace_binding (id, global_namespace);
361 *decl = global_value;
362 return global_value != NULL;
365 /* True is the binding of IDENTIFIER at global scope names a type. */
368 is_typename_at_global_scope (tree id)
370 tree global_value = namespace_binding (id, global_namespace);
372 return global_value && TREE_CODE (global_value) == TYPE_DECL;
375 #endif /* GCC_CP_NAME_LOOKUP_H */