1 /* Declarations for C++ name lookup routines.
2 Copyright (C) 2003-2013 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 3, 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 COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 #ifndef GCC_CP_NAME_LOOKUP_H
22 #define GCC_CP_NAME_LOOKUP_H
24 #include "c-family/c-common.h"
26 /* The type of dictionary used to map names to types declared at
28 typedef struct binding_table_s *binding_table;
29 typedef struct binding_entry_s *binding_entry;
31 /* The type of a routine repeatedly called by binding_table_foreach. */
32 typedef void (*bt_foreach_proc) (binding_entry, void *);
34 struct GTY(()) binding_entry_s {
40 /* These macros indicate the initial chains count for binding_table. */
41 #define SCOPE_DEFAULT_HT_SIZE (1 << 3)
42 #define CLASS_SCOPE_HT_SIZE (1 << 3)
43 #define NAMESPACE_ORDINARY_HT_SIZE (1 << 5)
44 #define NAMESPACE_STD_HT_SIZE (1 << 8)
45 #define GLOBAL_SCOPE_HT_SIZE (1 << 8)
47 extern void binding_table_foreach (binding_table, bt_foreach_proc, void *);
48 extern binding_entry binding_table_find (binding_table, tree);
50 /* Datatype that represents binding established by a declaration between
51 a name and a C++ entity. */
52 typedef struct cxx_binding cxx_binding;
54 /* The datatype used to implement C++ scope. */
55 typedef struct cp_binding_level cp_binding_level;
57 /* Nonzero if this binding is for a local scope, as opposed to a class
58 or namespace scope. */
59 #define LOCAL_BINDING_P(NODE) ((NODE)->is_local)
61 /* True if NODE->value is from a base class of the class which is
62 currently being defined. */
63 #define INHERITED_VALUE_BINDING_P(NODE) ((NODE)->value_is_inherited)
65 struct GTY(()) cxx_binding {
66 /* Link to chain together various bindings for this name. */
67 cxx_binding *previous;
68 /* The non-type entity this name is bound to. */
70 /* The type entity this name is bound to. */
72 /* The scope at which this binding was made. */
73 cp_binding_level *scope;
74 unsigned value_is_inherited : 1;
75 unsigned is_local : 1;
78 /* Datatype used to temporarily save C++ bindings (for implicit
79 instantiations purposes and like). Implemented in decl.c. */
80 typedef struct GTY(()) cxx_saved_binding {
81 /* The name of the current binding. */
83 /* The binding we're saving. */
89 extern tree identifier_type_value (tree);
90 extern void set_identifier_type_value (tree, tree);
91 extern void pop_binding (tree, 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 pseudo 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_cond, /* The scope of the variable declared in the condition
110 of an if or switch statement. */
111 sk_function_parms, /* The scope containing function parameters. */
112 sk_class, /* The scope containing the members of a class. */
113 sk_scoped_enum, /* The scope containing the enumertors of a C++0x
114 scoped enumeration. */
115 sk_namespace, /* The scope containing the members of a
116 namespace, including the global scope. */
117 sk_template_parms, /* A scope for template parameters. */
118 sk_template_spec, /* Like sk_template_parms, but for an explicit
119 specialization. Since, by definition, an
120 explicit specialization is introduced by
121 "template <>", this scope is always empty. */
122 sk_omp /* An OpenMP structured block. */
125 /* The scope where the class/struct/union/enum tag applies. */
126 typedef enum tag_scope {
127 ts_current = 0, /* Current scope only. This is for the
128 class-key identifier;
129 case mentioned in [basic.lookup.elab]/2,
130 or the class/enum definition
131 class-key identifier { ... }; */
132 ts_global = 1, /* All scopes. This is the 3.4.1
133 [basic.lookup.unqual] lookup mentioned
134 in [basic.lookup.elab]/2. */
135 ts_within_enclosing_non_class = 2, /* Search within enclosing non-class
136 only, for friend class lookup
137 according to [namespace.memdef]/3
138 and [class.friend]/9. */
139 ts_lambda = 3 /* Declaring a lambda closure. */
142 typedef struct GTY(()) cp_class_binding {
144 /* The bound name. */
149 typedef struct GTY(()) cp_label_binding {
150 /* The bound LABEL_DECL. */
152 /* The previous IDENTIFIER_LABEL_VALUE. */
157 /* For each binding contour we allocate a binding_level structure
158 which records the names defined in that contour.
161 1) one for each function definition,
162 where internal declarations of the parameters appear.
163 2) one for each compound statement,
164 to record its declarations.
166 The current meaning of a name can be found by searching the levels
167 from the current one out to the global one.
169 Off to the side, may be the class_binding_level. This exists only
170 to catch class-local declarations. It is otherwise nonexistent.
172 Also there may be binding levels that catch cleanups that must be
173 run when exceptions occur. Thus, to see whether a name is bound in
174 the current scope, it is not enough to look in the
175 CURRENT_BINDING_LEVEL. You should use lookup_name_current_level
178 /* Note that the information in the `names' component of the global contour
179 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
181 struct GTY(()) cp_binding_level {
182 /* A chain of _DECL nodes for all variables, constants, functions,
183 and typedef types. These are in the reverse of the order
184 supplied. There may be OVERLOADs on this list, too, but they
185 are wrapped in TREE_LISTs; the TREE_VALUE is the OVERLOAD. */
188 /* A chain of NAMESPACE_DECL nodes. */
191 /* An array of static functions and variables (for namespaces only) */
192 vec<tree, va_gc> *static_decls;
194 /* A list of USING_DECL nodes. */
197 /* A list of used namespaces. PURPOSE is the namespace,
198 VALUE the common ancestor with this binding_level's namespace. */
199 tree using_directives;
201 /* For the binding level corresponding to a class, the entities
202 declared in the class or its base classes. */
203 vec<cp_class_binding, va_gc> *class_shadowed;
205 /* Similar to class_shadowed, but for IDENTIFIER_TYPE_VALUE, and
206 is used for all binding levels. The TREE_PURPOSE is the name of
207 the entity, the TREE_TYPE is the associated type. In addition
208 the TREE_VALUE is the IDENTIFIER_TYPE_VALUE before we entered
212 /* Similar to class_shadowed, but for IDENTIFIER_LABEL_VALUE, and
213 used for all binding levels. */
214 vec<cp_label_binding, va_gc> *shadowed_labels;
216 /* For each level (except not the global one),
217 a chain of BLOCK nodes for all the levels
218 that were entered and exited one level down. */
221 /* The entity (namespace, class, function) the scope of which this
222 binding contour corresponds to. Otherwise NULL. */
225 /* The binding level which this one is contained in (inherits from). */
226 cp_binding_level *level_chain;
228 /* List of VAR_DECLS saved from a previous for statement.
229 These would be dead in ISO-conforming code, but might
230 be referenced in ARM-era code. */
231 vec<tree, va_gc> *dead_vars_from_for;
233 /* STATEMENT_LIST for statements in this binding contour.
234 Only used at present for SK_CLEANUP temporary bindings. */
237 /* Binding depth at which this level began. */
240 /* The kind of scope that this object represents. However, a
241 SK_TEMPLATE_SPEC scope is represented with KIND set to
242 SK_TEMPLATE_PARMS and EXPLICIT_SPEC_P set to true. */
243 ENUM_BITFIELD (scope_kind) kind : 4;
245 /* True if this scope is an SK_TEMPLATE_SPEC scope. This field is
246 only valid if KIND == SK_TEMPLATE_PARMS. */
247 BOOL_BITFIELD explicit_spec_p : 1;
249 /* true means make a BLOCK for this level regardless of all else. */
252 /* Nonzero if this level can safely have additional
253 cleanup-needing variables added to it. */
254 unsigned more_cleanups_ok : 1;
255 unsigned have_cleanups : 1;
257 /* 24 bits left to fill a 32-bit word. */
260 /* The binding level currently in effect. */
262 #define current_binding_level \
263 (*(cfun && cp_function_chain && cp_function_chain->bindings \
264 ? &cp_function_chain->bindings \
265 : &scope_chain->bindings))
267 /* The binding level of the current class, if any. */
269 #define class_binding_level scope_chain->class_bindings
271 /* The tree node representing the global scope. */
272 extern GTY(()) tree global_namespace;
273 extern GTY(()) tree global_scope_name;
275 /* Indicates that there is a type value in some namespace, although
276 that is not necessarily in scope at the moment. */
278 extern GTY(()) tree global_type_node;
280 /* True if SCOPE designates the global scope binding contour. */
281 #define global_scope_p(SCOPE) \
282 ((SCOPE) == NAMESPACE_LEVEL (global_namespace))
284 extern cp_binding_level *leave_scope (void);
285 extern bool kept_level_p (void);
286 extern bool global_bindings_p (void);
287 extern bool toplevel_bindings_p (void);
288 extern bool namespace_bindings_p (void);
289 extern bool local_bindings_p (void);
290 extern bool template_parm_scope_p (void);
291 extern scope_kind innermost_scope_kind (void);
292 extern cp_binding_level *begin_scope (scope_kind, tree);
293 extern void print_binding_stack (void);
294 extern void push_to_top_level (void);
295 extern void pop_from_top_level (void);
296 extern void pop_everything (void);
297 extern void keep_next_level (bool);
298 extern bool is_ancestor (tree, tree);
299 extern tree push_scope (tree);
300 extern void pop_scope (tree);
301 extern tree push_inner_scope (tree);
302 extern void pop_inner_scope (tree, tree);
303 extern void push_binding_level (cp_binding_level *);
305 extern void push_namespace (tree);
306 extern void pop_namespace (void);
307 extern void push_nested_namespace (tree);
308 extern void pop_nested_namespace (tree);
309 extern bool handle_namespace_attrs (tree, tree);
310 extern void pushlevel_class (void);
311 extern void poplevel_class (void);
312 extern tree pushdecl_with_scope (tree, cp_binding_level *, bool);
313 extern tree lookup_name_prefer_type (tree, int);
314 extern tree lookup_name_real (tree, int, int, bool, int, int);
315 extern tree lookup_type_scope (tree, tag_scope);
316 extern tree namespace_binding (tree, tree);
317 extern void set_namespace_binding (tree, tree, tree);
318 extern bool hidden_name_p (tree);
319 extern tree remove_hidden_names (tree);
320 extern tree lookup_qualified_name (tree, tree, bool, bool);
321 extern tree lookup_name_nonclass (tree);
322 extern tree lookup_name_innermost_nonclass_level (tree);
323 extern bool is_local_extern (tree);
324 extern tree lookup_function_nonclass (tree, vec<tree, va_gc> *, bool);
325 extern void push_local_binding (tree, tree, int);
326 extern bool pushdecl_class_level (tree);
327 extern tree pushdecl_namespace_level (tree, bool);
328 extern bool push_class_level_binding (tree, tree);
329 extern tree getdecls (void);
330 extern int function_parm_depth (void);
331 extern tree cp_namespace_decls (tree);
332 extern void set_decl_namespace (tree, tree, bool);
333 extern void push_decl_namespace (tree);
334 extern void pop_decl_namespace (void);
335 extern void do_namespace_alias (tree, tree);
336 extern void do_toplevel_using_decl (tree, tree, tree);
337 extern void do_local_using_decl (tree, tree, tree);
338 extern tree do_class_using_decl (tree, tree);
339 extern void do_using_directive (tree);
340 extern tree lookup_arg_dependent (tree, tree, vec<tree, va_gc> *, bool);
341 extern bool is_associated_namespace (tree, tree);
342 extern void parse_using_directive (tree, tree);
343 extern tree innermost_non_namespace_value (tree);
344 extern cxx_binding *outer_binding (tree, cxx_binding *, bool);
345 extern void cp_emit_debug_info_for_using (tree, tree);
347 /* Set *DECL to the (non-hidden) declaration for ID at global scope,
348 if present and return true; otherwise return false. */
351 get_global_value_if_present (tree id, tree *decl)
353 tree global_value = namespace_binding (id, global_namespace);
355 *decl = global_value;
356 return global_value != NULL;
359 /* True is the binding of IDENTIFIER at global scope names a type. */
362 is_typename_at_global_scope (tree id)
364 tree global_value = namespace_binding (id, global_namespace);
366 return global_value && TREE_CODE (global_value) == TYPE_DECL;
369 #endif /* GCC_CP_NAME_LOOKUP_H */