1 /* Declarations for C++ name lookup routines.
2 Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 #ifndef GCC_CP_NAME_LOOKUP_H
23 #define GCC_CP_NAME_LOOKUP_H
25 #include "c-family/c-common.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 GTY(()) binding_entry_s {
41 /* These macros indicate the initial chains count for binding_table. */
42 #define SCOPE_DEFAULT_HT_SIZE (1 << 3)
43 #define CLASS_SCOPE_HT_SIZE (1 << 3)
44 #define NAMESPACE_ORDINARY_HT_SIZE (1 << 5)
45 #define NAMESPACE_STD_HT_SIZE (1 << 8)
46 #define GLOBAL_SCOPE_HT_SIZE (1 << 8)
48 extern void binding_table_foreach (binding_table, bt_foreach_proc, void *);
49 extern binding_entry binding_table_find (binding_table, tree);
51 /* Datatype that represents binding established by a declaration between
52 a name and a C++ entity. */
53 typedef struct cxx_binding cxx_binding;
55 /* The datatype used to implement C++ scope. */
56 typedef struct cp_binding_level cxx_scope;
58 /* Nonzero if this binding is for a local scope, as opposed to a class
59 or namespace scope. */
60 #define LOCAL_BINDING_P(NODE) ((NODE)->is_local)
62 /* True if NODE->value is from a base class of the class which is
63 currently being defined. */
64 #define INHERITED_VALUE_BINDING_P(NODE) ((NODE)->value_is_inherited)
66 struct GTY(()) cxx_binding {
67 /* Link to chain together various bindings for this name. */
68 cxx_binding *previous;
69 /* The non-type entity this name is bound to. */
71 /* The type entity this name is bound to. */
73 /* The scope at which this binding was made. */
75 unsigned value_is_inherited : 1;
76 unsigned is_local : 1;
79 /* Datatype used to temporarily save C++ bindings (for implicit
80 instantiations purposes and like). Implemented in decl.c. */
81 typedef struct GTY(()) cxx_saved_binding {
82 /* The name of the current binding. */
84 /* The binding we're saving. */
89 DEF_VEC_O(cxx_saved_binding);
90 DEF_VEC_ALLOC_O(cxx_saved_binding,gc);
92 extern tree identifier_type_value (tree);
93 extern void set_identifier_type_value (tree, tree);
94 extern void pop_binding (tree, tree);
95 extern tree constructor_name (tree);
96 extern bool constructor_name_p (tree, tree);
98 /* The kinds of scopes we recognize. */
99 typedef enum scope_kind {
100 sk_block = 0, /* An ordinary block scope. This enumerator must
101 have the value zero because "cp_binding_level"
102 is initialized by using "memset" to set the
103 contents to zero, and the default scope kind
105 sk_cleanup, /* A scope for (pseudo-)scope for cleanup. It is
106 pseudo in that it is transparent to name lookup
108 sk_try, /* A try-block. */
109 sk_catch, /* A catch-block. */
110 sk_for, /* The scope of the variable declared in a
111 for-init-statement. */
112 sk_cond, /* The scope of the variable declared in the condition
113 of an if or switch statement. */
114 sk_function_parms, /* The scope containing function parameters. */
115 sk_class, /* The scope containing the members of a class. */
116 sk_scoped_enum, /* The scope containing the enumertors of a C++0x
117 scoped enumeration. */
118 sk_namespace, /* The scope containing the members of a
119 namespace, including the global scope. */
120 sk_template_parms, /* A scope for template parameters. */
121 sk_template_spec, /* Like sk_template_parms, but for an explicit
122 specialization. Since, by definition, an
123 explicit specialization is introduced by
124 "template <>", this scope is always empty. */
125 sk_omp /* An OpenMP structured block. */
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 GTY(()) cp_class_binding {
146 /* The bound name. */
150 DEF_VEC_O(cp_class_binding);
151 DEF_VEC_ALLOC_O(cp_class_binding,gc);
153 typedef struct GTY(()) cp_label_binding {
154 /* The bound LABEL_DECL. */
156 /* The previous IDENTIFIER_LABEL_VALUE. */
160 DEF_VEC_O(cp_label_binding);
161 DEF_VEC_ALLOC_O(cp_label_binding,gc);
163 /* For each binding contour we allocate a binding_level structure
164 which records the names defined in that contour.
167 1) one for each function definition,
168 where internal declarations of the parameters appear.
169 2) one for each compound statement,
170 to record its declarations.
172 The current meaning of a name can be found by searching the levels
173 from the current one out to the global one.
175 Off to the side, may be the class_binding_level. This exists only
176 to catch class-local declarations. It is otherwise nonexistent.
178 Also there may be binding levels that catch cleanups that must be
179 run when exceptions occur. Thus, to see whether a name is bound in
180 the current scope, it is not enough to look in the
181 CURRENT_BINDING_LEVEL. You should use lookup_name_current_level
184 /* Note that the information in the `names' component of the global contour
185 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
187 struct GTY(()) cp_binding_level {
188 /* A chain of _DECL nodes for all variables, constants, functions,
189 and typedef types. These are in the reverse of the order
190 supplied. There may be OVERLOADs on this list, too, but they
191 are wrapped in TREE_LISTs; the TREE_VALUE is the OVERLOAD. */
194 /* Count of elements in names chain. */
197 /* A chain of NAMESPACE_DECL nodes. */
200 /* An array of static functions and variables (for namespaces only) */
201 VEC(tree,gc) *static_decls;
203 /* A list of USING_DECL nodes. */
206 /* A list of used namespaces. PURPOSE is the namespace,
207 VALUE the common ancestor with this binding_level's namespace. */
208 tree using_directives;
210 /* For the binding level corresponding to a class, the entities
211 declared in the class or its base classes. */
212 VEC(cp_class_binding,gc) *class_shadowed;
214 /* Similar to class_shadowed, but for IDENTIFIER_TYPE_VALUE, and
215 is used for all binding levels. The TREE_PURPOSE is the name of
216 the entity, the TREE_TYPE is the associated type. In addition
217 the TREE_VALUE is the IDENTIFIER_TYPE_VALUE before we entered
221 /* Similar to class_shadowed, but for IDENTIFIER_LABEL_VALUE, and
222 used for all binding levels. */
223 VEC(cp_label_binding,gc) *shadowed_labels;
225 /* For each level (except not the global one),
226 a chain of BLOCK nodes for all the levels
227 that were entered and exited one level down. */
230 /* The entity (namespace, class, function) the scope of which this
231 binding contour corresponds to. Otherwise NULL. */
234 /* The binding level which this one is contained in (inherits from). */
235 struct cp_binding_level *level_chain;
237 /* List of VAR_DECLS saved from a previous for statement.
238 These would be dead in ISO-conforming code, but might
239 be referenced in ARM-era code. */
240 VEC(tree,gc) *dead_vars_from_for;
242 /* STATEMENT_LIST for statements in this binding contour.
243 Only used at present for SK_CLEANUP temporary bindings. */
246 /* Binding depth at which this level began. */
249 /* The kind of scope that this object represents. However, a
250 SK_TEMPLATE_SPEC scope is represented with KIND set to
251 SK_TEMPLATE_PARMS and EXPLICIT_SPEC_P set to true. */
252 ENUM_BITFIELD (scope_kind) kind : 4;
254 /* True if this scope is an SK_TEMPLATE_SPEC scope. This field is
255 only valid if KIND == SK_TEMPLATE_PARMS. */
256 BOOL_BITFIELD explicit_spec_p : 1;
258 /* true means make a BLOCK for this level regardless of all else. */
261 /* Nonzero if this level can safely have additional
262 cleanup-needing variables added to it. */
263 unsigned more_cleanups_ok : 1;
264 unsigned have_cleanups : 1;
266 /* 24 bits left to fill a 32-bit word. */
269 /* The binding level currently in effect. */
271 #define current_binding_level \
272 (*(cfun && cp_function_chain && cp_function_chain->bindings \
273 ? &cp_function_chain->bindings \
274 : &scope_chain->bindings))
276 /* The binding level of the current class, if any. */
278 #define class_binding_level scope_chain->class_bindings
280 /* The tree node representing the global scope. */
281 extern GTY(()) tree global_namespace;
282 extern GTY(()) tree global_scope_name;
284 /* Indicates that there is a type value in some namespace, although
285 that is not necessarily in scope at the moment. */
287 extern GTY(()) tree global_type_node;
289 /* True if SCOPE designates the global scope binding contour. */
290 #define global_scope_p(SCOPE) \
291 ((SCOPE) == NAMESPACE_LEVEL (global_namespace))
293 extern cxx_scope *leave_scope (void);
294 extern bool kept_level_p (void);
295 extern bool global_bindings_p (void);
296 extern bool toplevel_bindings_p (void);
297 extern bool namespace_bindings_p (void);
298 extern bool template_parm_scope_p (void);
299 extern scope_kind innermost_scope_kind (void);
300 extern cxx_scope *begin_scope (scope_kind, tree);
301 extern void print_binding_stack (void);
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 tree 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 bool handle_namespace_attrs (tree, tree);
318 extern void pushlevel_class (void);
319 extern void poplevel_class (void);
320 extern tree pushdecl_with_scope (tree, cxx_scope *, bool);
321 extern tree lookup_name_prefer_type (tree, int);
322 extern tree lookup_name_real (tree, int, int, bool, int, int);
323 extern tree lookup_type_scope (tree, tag_scope);
324 extern tree namespace_binding (tree, tree);
325 extern void set_namespace_binding (tree, tree, tree);
326 extern bool hidden_name_p (tree);
327 extern tree remove_hidden_names (tree);
328 extern tree lookup_qualified_name (tree, tree, bool, bool);
329 extern tree lookup_name_nonclass (tree);
330 extern tree lookup_name_innermost_nonclass_level (tree);
331 extern bool is_local_extern (tree);
332 extern tree lookup_function_nonclass (tree, VEC(tree,gc) *, bool);
333 extern void push_local_binding (tree, tree, int);
334 extern bool pushdecl_class_level (tree);
335 extern tree pushdecl_namespace_level (tree, bool);
336 extern bool push_class_level_binding (tree, tree);
337 extern tree getdecls (void);
338 extern int function_parm_depth (void);
339 extern tree cp_namespace_decls (tree);
340 extern void set_decl_namespace (tree, tree, bool);
341 extern void push_decl_namespace (tree);
342 extern void pop_decl_namespace (void);
343 extern void do_namespace_alias (tree, tree);
344 extern void do_toplevel_using_decl (tree, tree, tree);
345 extern void do_local_using_decl (tree, tree, tree);
346 extern tree do_class_using_decl (tree, tree);
347 extern void do_using_directive (tree);
348 extern tree lookup_arg_dependent (tree, tree, VEC(tree,gc) *, bool);
349 extern bool is_associated_namespace (tree, tree);
350 extern void parse_using_directive (tree, tree);
351 extern tree innermost_non_namespace_value (tree);
352 extern cxx_binding *outer_binding (tree, cxx_binding *, bool);
353 extern void cp_emit_debug_info_for_using (tree, tree);
355 /* Set *DECL to the (non-hidden) declaration for ID at global scope,
356 if present and return true; otherwise return false. */
359 get_global_value_if_present (tree id, tree *decl)
361 tree global_value = namespace_binding (id, global_namespace);
363 *decl = global_value;
364 return global_value != NULL;
367 /* True is the binding of IDENTIFIER at global scope names a type. */
370 is_typename_at_global_scope (tree id)
372 tree global_value = namespace_binding (id, global_namespace);
374 return global_value && TREE_CODE (global_value) == TYPE_DECL;
377 #endif /* GCC_CP_NAME_LOOKUP_H */