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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [cp/] [name-lookup.h] - Blame information for rev 711

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1 710 jeremybenn
/* Declarations for C++ name lookup routines.
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   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
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   Free Software Foundation, Inc.
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   Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
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6
This file is part of GCC.
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8
GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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13
GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
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#ifndef GCC_CP_NAME_LOOKUP_H
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#define GCC_CP_NAME_LOOKUP_H
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#include "c-family/c-common.h"
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/* The type of dictionary used to map names to types declared at
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   a given scope.  */
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typedef struct binding_table_s *binding_table;
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typedef struct binding_entry_s *binding_entry;
31
 
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/* The type of a routine repeatedly called by binding_table_foreach.  */
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typedef void (*bt_foreach_proc) (binding_entry, void *);
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struct GTY(()) binding_entry_s {
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  binding_entry chain;
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  tree name;
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  tree type;
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};
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/* These macros indicate the initial chains count for binding_table.  */
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#define SCOPE_DEFAULT_HT_SIZE           (1 << 3)
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#define CLASS_SCOPE_HT_SIZE             (1 << 3)
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#define NAMESPACE_ORDINARY_HT_SIZE      (1 << 5)
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#define NAMESPACE_STD_HT_SIZE           (1 << 8)
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#define GLOBAL_SCOPE_HT_SIZE            (1 << 8)
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extern void binding_table_foreach (binding_table, bt_foreach_proc, void *);
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extern binding_entry binding_table_find (binding_table, tree);
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/* Datatype that represents binding established by a declaration between
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   a name and a C++ entity.  */
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typedef struct cxx_binding cxx_binding;
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/* The datatype used to implement C++ scope.  */
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typedef struct cp_binding_level cp_binding_level;
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/* Nonzero if this binding is for a local scope, as opposed to a class
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   or namespace scope.  */
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#define LOCAL_BINDING_P(NODE) ((NODE)->is_local)
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/* True if NODE->value is from a base class of the class which is
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   currently being defined.  */
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#define INHERITED_VALUE_BINDING_P(NODE) ((NODE)->value_is_inherited)
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struct GTY(()) cxx_binding {
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  /* Link to chain together various bindings for this name.  */
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  cxx_binding *previous;
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  /* The non-type entity this name is bound to.  */
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  tree value;
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  /* The type entity this name is bound to.  */
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  tree type;
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  /* The scope at which this binding was made.  */
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  cp_binding_level *scope;
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  unsigned value_is_inherited : 1;
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  unsigned is_local : 1;
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};
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/* Datatype used to temporarily save C++ bindings (for implicit
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   instantiations purposes and like).  Implemented in decl.c.  */
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typedef struct GTY(()) cxx_saved_binding {
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  /* The name of the current binding.  */
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  tree identifier;
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  /* The binding we're saving.  */
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  cxx_binding *binding;
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  tree real_type_value;
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} cxx_saved_binding;
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89
DEF_VEC_O(cxx_saved_binding);
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DEF_VEC_ALLOC_O(cxx_saved_binding,gc);
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92
extern tree identifier_type_value (tree);
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extern void set_identifier_type_value (tree, tree);
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extern void pop_binding (tree, tree);
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extern tree constructor_name (tree);
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extern bool constructor_name_p (tree, tree);
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/* The kinds of scopes we recognize.  */
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typedef enum scope_kind {
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  sk_block = 0,      /* An ordinary block scope.  This enumerator must
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                        have the value zero because "cp_binding_level"
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                        is initialized by using "memset" to set the
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                        contents to zero, and the default scope kind
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                        is "sk_block".  */
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  sk_cleanup,        /* A scope for (pseudo-)scope for cleanup.  It is
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                        pseudo in that it is transparent to name lookup
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                        activities.  */
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  sk_try,            /* A try-block.  */
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  sk_catch,          /* A catch-block.  */
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  sk_for,            /* The scope of the variable declared in a
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                        for-init-statement.  */
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  sk_cond,           /* The scope of the variable declared in the condition
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                        of an if or switch statement.  */
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  sk_function_parms, /* The scope containing function parameters.  */
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  sk_class,          /* The scope containing the members of a class.  */
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  sk_scoped_enum,    /* The scope containing the enumertors of a C++0x
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                        scoped enumeration.  */
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  sk_namespace,      /* The scope containing the members of a
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                        namespace, including the global scope.  */
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  sk_template_parms, /* A scope for template parameters.  */
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  sk_template_spec,  /* Like sk_template_parms, but for an explicit
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                        specialization.  Since, by definition, an
123
                        explicit specialization is introduced by
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                        "template <>", this scope is always empty.  */
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  sk_omp             /* An OpenMP structured block.  */
126
} scope_kind;
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128
/* The scope where the class/struct/union/enum tag applies.  */
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typedef enum tag_scope {
130
  ts_current = 0,        /* Current scope only.  This is for the
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                             class-key identifier;
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                           case mentioned in [basic.lookup.elab]/2,
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                           or the class/enum definition
134
                             class-key identifier { ... };  */
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  ts_global = 1,        /* All scopes.  This is the 3.4.1
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                           [basic.lookup.unqual] lookup mentioned
137
                           in [basic.lookup.elab]/2.  */
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  ts_within_enclosing_non_class = 2     /* Search within enclosing non-class
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                                           only, for friend class lookup
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                                           according to [namespace.memdef]/3
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                                           and [class.friend]/9.  */
142
} tag_scope;
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144
typedef struct GTY(()) cp_class_binding {
145
  cxx_binding *base;
146
  /* The bound name.  */
147
  tree identifier;
148
} cp_class_binding;
149
 
150
DEF_VEC_O(cp_class_binding);
151
DEF_VEC_ALLOC_O(cp_class_binding,gc);
152
 
153
typedef struct GTY(()) cp_label_binding {
154
  /* The bound LABEL_DECL.  */
155
  tree label;
156
  /* The previous IDENTIFIER_LABEL_VALUE.  */
157
  tree prev_value;
158
} cp_label_binding;
159
 
160
DEF_VEC_O(cp_label_binding);
161
DEF_VEC_ALLOC_O(cp_label_binding,gc);
162
 
163
/* For each binding contour we allocate a binding_level structure
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   which records the names defined in that contour.
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   Contours include:
166
    0) the global one
167
    1) one for each function definition,
168
       where internal declarations of the parameters appear.
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    2) one for each compound statement,
170
       to record its declarations.
171
 
172
   The current meaning of a name can be found by searching the levels
173
   from the current one out to the global one.
174
 
175
   Off to the side, may be the class_binding_level.  This exists only
176
   to catch class-local declarations.  It is otherwise nonexistent.
177
 
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
182
   instead.  */
183
 
184
/* Note that the information in the `names' component of the global contour
185
   is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers.  */
186
 
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.  */
192
  tree names;
193
 
194
  /* A chain of NAMESPACE_DECL nodes.  */
195
  tree namespaces;
196
 
197
  /* An array of static functions and variables (for namespaces only) */
198
  VEC(tree,gc) *static_decls;
199
 
200
  /* A list of USING_DECL nodes.  */
201
  tree usings;
202
 
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;
206
 
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,gc) *class_shadowed;
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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
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      the entity, the TREE_TYPE is the associated type.  In addition
214
      the TREE_VALUE is the IDENTIFIER_TYPE_VALUE before we entered
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      the class.  */
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  tree type_shadowed;
217
 
218
  /* Similar to class_shadowed, but for IDENTIFIER_LABEL_VALUE, and
219
      used for all binding levels.  */
220
  VEC(cp_label_binding,gc) *shadowed_labels;
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222
  /* For each level (except not the global one),
223
      a chain of BLOCK nodes for all the levels
224
      that were entered and exited one level down.  */
225
  tree blocks;
226
 
227
  /* The entity (namespace, class, function) the scope of which this
228
      binding contour corresponds to.  Otherwise NULL.  */
229
  tree this_entity;
230
 
231
  /* The binding level which this one is contained in (inherits from).  */
232
  cp_binding_level *level_chain;
233
 
234
  /* List of VAR_DECLS saved from a previous for statement.
235
      These would be dead in ISO-conforming code, but might
236
      be referenced in ARM-era code.  */
237
  VEC(tree,gc) *dead_vars_from_for;
238
 
239
  /* STATEMENT_LIST for statements in this binding contour.
240
      Only used at present for SK_CLEANUP temporary bindings.  */
241
  tree statement_list;
242
 
243
  /* Binding depth at which this level began.  */
244
  int binding_depth;
245
 
246
  /* The kind of scope that this object represents.  However, a
247
      SK_TEMPLATE_SPEC scope is represented with KIND set to
248
      SK_TEMPLATE_PARMS and EXPLICIT_SPEC_P set to true.  */
249
  ENUM_BITFIELD (scope_kind) kind : 4;
250
 
251
  /* True if this scope is an SK_TEMPLATE_SPEC scope.  This field is
252
      only valid if KIND == SK_TEMPLATE_PARMS.  */
253
  BOOL_BITFIELD explicit_spec_p : 1;
254
 
255
  /* true means make a BLOCK for this level regardless of all else.  */
256
  unsigned keep : 1;
257
 
258
  /* Nonzero if this level can safely have additional
259
      cleanup-needing variables added to it.  */
260
  unsigned more_cleanups_ok : 1;
261
  unsigned have_cleanups : 1;
262
 
263
  /* 24 bits left to fill a 32-bit word.  */
264
};
265
 
266
/* The binding level currently in effect.  */
267
 
268
#define current_binding_level                   \
269
  (*(cfun && cp_function_chain && cp_function_chain->bindings \
270
   ? &cp_function_chain->bindings               \
271
   : &scope_chain->bindings))
272
 
273
/* The binding level of the current class, if any.  */
274
 
275
#define class_binding_level scope_chain->class_bindings
276
 
277
/* The tree node representing the global scope.  */
278
extern GTY(()) tree global_namespace;
279
extern GTY(()) tree global_scope_name;
280
 
281
/* Indicates that there is a type value in some namespace, although
282
   that is not necessarily in scope at the moment.  */
283
 
284
extern GTY(()) tree global_type_node;
285
 
286
/* True if SCOPE designates the global scope binding contour.  */
287
#define global_scope_p(SCOPE) \
288
  ((SCOPE) == NAMESPACE_LEVEL (global_namespace))
289
 
290
extern cp_binding_level *leave_scope (void);
291
extern bool kept_level_p (void);
292
extern bool global_bindings_p (void);
293
extern bool toplevel_bindings_p (void);
294
extern bool namespace_bindings_p (void);
295
extern bool local_bindings_p (void);
296
extern bool template_parm_scope_p (void);
297
extern scope_kind innermost_scope_kind (void);
298
extern cp_binding_level *begin_scope (scope_kind, tree);
299
extern void print_binding_stack (void);
300
extern void push_to_top_level (void);
301
extern void pop_from_top_level (void);
302
extern void pop_everything (void);
303
extern void keep_next_level (bool);
304
extern bool is_ancestor (tree, tree);
305
extern tree push_scope (tree);
306
extern void pop_scope (tree);
307
extern tree push_inner_scope (tree);
308
extern void pop_inner_scope (tree, tree);
309
extern void push_binding_level (cp_binding_level *);
310
 
311
extern void push_namespace (tree);
312
extern void pop_namespace (void);
313
extern void push_nested_namespace (tree);
314
extern void pop_nested_namespace (tree);
315
extern bool handle_namespace_attrs (tree, tree);
316
extern void pushlevel_class (void);
317
extern void poplevel_class (void);
318
extern tree pushdecl_with_scope (tree, cp_binding_level *, bool);
319
extern tree lookup_name_prefer_type (tree, int);
320
extern tree lookup_name_real (tree, int, int, bool, int, int);
321
extern tree lookup_type_scope (tree, tag_scope);
322
extern tree namespace_binding (tree, tree);
323
extern void set_namespace_binding (tree, tree, tree);
324
extern bool hidden_name_p (tree);
325
extern tree remove_hidden_names (tree);
326
extern tree lookup_qualified_name (tree, tree, bool, bool);
327
extern tree lookup_name_nonclass (tree);
328
extern tree lookup_name_innermost_nonclass_level (tree);
329
extern bool is_local_extern (tree);
330
extern tree lookup_function_nonclass (tree, VEC(tree,gc) *, bool);
331
extern void push_local_binding (tree, tree, int);
332
extern bool pushdecl_class_level (tree);
333
extern tree pushdecl_namespace_level (tree, bool);
334
extern bool push_class_level_binding (tree, tree);
335
extern tree getdecls (void);
336
extern int function_parm_depth (void);
337
extern tree cp_namespace_decls (tree);
338
extern void set_decl_namespace (tree, tree, bool);
339
extern void push_decl_namespace (tree);
340
extern void pop_decl_namespace (void);
341
extern void do_namespace_alias (tree, tree);
342
extern void do_toplevel_using_decl (tree, tree, tree);
343
extern void do_local_using_decl (tree, tree, tree);
344
extern tree do_class_using_decl (tree, tree);
345
extern void do_using_directive (tree);
346
extern tree lookup_arg_dependent (tree, tree, VEC(tree,gc) *, bool);
347
extern bool is_associated_namespace (tree, tree);
348
extern void parse_using_directive (tree, tree);
349
extern tree innermost_non_namespace_value (tree);
350
extern cxx_binding *outer_binding (tree, cxx_binding *, bool);
351
extern void cp_emit_debug_info_for_using (tree, tree);
352
 
353
/* Set *DECL to the (non-hidden) declaration for ID at global scope,
354
   if present and return true; otherwise return false.  */
355
 
356
static inline bool
357
get_global_value_if_present (tree id, tree *decl)
358
{
359
  tree global_value = namespace_binding (id, global_namespace);
360
  if (global_value)
361
    *decl = global_value;
362
  return global_value != NULL;
363
}
364
 
365
/* True is the binding of IDENTIFIER at global scope names a type.  */
366
 
367
static inline bool
368
is_typename_at_global_scope (tree id)
369
{
370
  tree global_value = namespace_binding (id, global_namespace);
371
 
372
  return global_value && TREE_CODE (global_value) == TYPE_DECL;
373
}
374
 
375
#endif /* GCC_CP_NAME_LOOKUP_H */

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