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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [cp/] [name-lookup.h] - Blame information for rev 294

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1 283 jeremybenn
/* Declarations for C++ name lookup routines.
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   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009
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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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This file is part of GCC.
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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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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-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;
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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 cxx_scope;
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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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  cxx_scope *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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DEF_VEC_O(cxx_saved_binding);
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DEF_VEC_ALLOC_O(cxx_saved_binding,gc);
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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_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
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                        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.  */
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} scope_kind;
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/* The scope where the class/struct/union/enum tag applies.  */
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typedef enum tag_scope {
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  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
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                             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
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                           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.  */
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} tag_scope;
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typedef struct GTY(()) cp_class_binding {
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  cxx_binding base;
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  /* The bound name.  */
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  tree identifier;
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} cp_class_binding;
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148
DEF_VEC_O(cp_class_binding);
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DEF_VEC_ALLOC_O(cp_class_binding,gc);
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/* 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:
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    0) the global one
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    1) one for each function definition,
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       where internal declarations of the parameters appear.
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    2) one for each compound statement,
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       to record its declarations.
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   The current meaning of a name can be found by searching the levels
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   from the current one out to the global one.
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   Off to the side, may be the class_binding_level.  This exists only
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   to catch class-local declarations.  It is otherwise nonexistent.
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166
   Also there may be binding levels that catch cleanups that must be
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   run when exceptions occur.  Thus, to see whether a name is bound in
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   the current scope, it is not enough to look in the
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   CURRENT_BINDING_LEVEL.  You should use lookup_name_current_level
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   instead.  */
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172
/* Note that the information in the `names' component of the global contour
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   is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers.  */
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175
struct GTY(()) cp_binding_level {
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    /* A chain of _DECL nodes for all variables, constants, functions,
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       and typedef types.  These are in the reverse of the order
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       supplied.  There may be OVERLOADs on this list, too, but they
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       are wrapped in TREE_LISTs; the TREE_VALUE is the OVERLOAD.  */
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    tree names;
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    /* Count of elements in names chain.  */
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    size_t names_size;
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    /* A chain of NAMESPACE_DECL nodes.  */
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    tree namespaces;
187
 
188
    /* An array of static functions and variables (for namespaces only) */
189
    VEC(tree,gc) *static_decls;
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191
    /* A list of USING_DECL nodes.  */
192
    tree usings;
193
 
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    /* A list of used namespaces. PURPOSE is the namespace,
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       VALUE the common ancestor with this binding_level's namespace.  */
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    tree using_directives;
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    /* For the binding level corresponding to a class, the entities
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       declared in the class or its base classes.  */
200
    VEC(cp_class_binding,gc) *class_shadowed;
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    /* Similar to class_shadowed, but for IDENTIFIER_TYPE_VALUE, and
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       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
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       the TREE_VALUE is the IDENTIFIER_TYPE_VALUE before we entered
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       the class.  */
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    tree type_shadowed;
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    /* A TREE_LIST.  Each TREE_VALUE is the LABEL_DECL for a local
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       label in this scope.  The TREE_PURPOSE is the previous value of
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       the IDENTIFIER_LABEL VALUE.  */
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    tree shadowed_labels;
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    /* For each level (except not the global one),
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       a chain of BLOCK nodes for all the levels
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       that were entered and exited one level down.  */
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    tree blocks;
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    /* The entity (namespace, class, function) the scope of which this
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       binding contour corresponds to.  Otherwise NULL.  */
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    tree this_entity;
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    /* The binding level which this one is contained in (inherits from).  */
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    struct cp_binding_level *level_chain;
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    /* List of VAR_DECLS saved from a previous for statement.
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       These would be dead in ISO-conforming code, but might
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       be referenced in ARM-era code.  These are stored in a
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       TREE_LIST; the TREE_VALUE is the actual declaration.  */
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    tree dead_vars_from_for;
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232
    /* STATEMENT_LIST for statements in this binding contour.
233
       Only used at present for SK_CLEANUP temporary bindings.  */
234
    tree statement_list;
235
 
236
    /* Binding depth at which this level began.  */
237
    int binding_depth;
238
 
239
    /* The kind of scope that this object represents.  However, a
240
       SK_TEMPLATE_SPEC scope is represented with KIND set to
241
       SK_TEMPLATE_PARMS and EXPLICIT_SPEC_P set to true.  */
242
    ENUM_BITFIELD (scope_kind) kind : 4;
243
 
244
    /* True if this scope is an SK_TEMPLATE_SPEC scope.  This field is
245
       only valid if KIND == SK_TEMPLATE_PARMS.  */
246
    BOOL_BITFIELD explicit_spec_p : 1;
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248
    /* true means make a BLOCK for this level regardless of all else.  */
249
    unsigned keep : 1;
250
 
251
    /* Nonzero if this level can safely have additional
252
       cleanup-needing variables added to it.  */
253
    unsigned more_cleanups_ok : 1;
254
    unsigned have_cleanups : 1;
255
 
256
    /* 24 bits left to fill a 32-bit word.  */
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  };
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259
/* The binding level currently in effect.  */
260
 
261
#define current_binding_level                   \
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  (*(cfun && cp_function_chain && cp_function_chain->bindings \
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   ? &cp_function_chain->bindings               \
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   : &scope_chain->bindings))
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266
/* The binding level of the current class, if any.  */
267
 
268
#define class_binding_level scope_chain->class_bindings
269
 
270
/* The tree node representing the global scope.  */
271
extern GTY(()) tree global_namespace;
272
extern GTY(()) tree global_scope_name;
273
 
274
/* Indicates that there is a type value in some namespace, although
275
   that is not necessarily in scope at the moment.  */
276
 
277
extern GTY(()) tree global_type_node;
278
 
279
/* True if SCOPE designates the global scope binding contour.  */
280
#define global_scope_p(SCOPE) \
281
  ((SCOPE) == NAMESPACE_LEVEL (global_namespace))
282
 
283
extern cxx_scope *leave_scope (void);
284
extern bool kept_level_p (void);
285
extern int global_bindings_p (void);
286
extern bool toplevel_bindings_p (void);
287
extern bool namespace_bindings_p (void);
288
extern bool template_parm_scope_p (void);
289
extern scope_kind innermost_scope_kind (void);
290
extern cxx_scope *begin_scope (scope_kind, tree);
291
extern void print_binding_stack (void);
292
extern void push_to_top_level (void);
293
extern void pop_from_top_level (void);
294
extern void pop_everything (void);
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extern void keep_next_level (bool);
296
extern bool is_ancestor (tree, tree);
297
extern tree push_scope (tree);
298
extern void pop_scope (tree);
299
extern tree push_inner_scope (tree);
300
extern void pop_inner_scope (tree, tree);
301
extern void push_binding_level (struct cp_binding_level *);
302
 
303
extern void push_namespace (tree);
304
extern void pop_namespace (void);
305
extern void push_nested_namespace (tree);
306
extern void pop_nested_namespace (tree);
307
extern bool handle_namespace_attrs (tree, tree);
308
extern void pushlevel_class (void);
309
extern void poplevel_class (void);
310
extern tree pushdecl_with_scope (tree, cxx_scope *, bool);
311
extern tree lookup_name_prefer_type (tree, int);
312
extern tree lookup_name_real (tree, int, int, bool, int, int);
313
extern tree lookup_type_scope (tree, tag_scope);
314
extern tree namespace_binding (tree, tree);
315
extern void set_namespace_binding (tree, tree, tree);
316
extern bool hidden_name_p (tree);
317
extern tree remove_hidden_names (tree);
318
extern tree lookup_qualified_name (tree, tree, bool, bool);
319
extern tree lookup_name_nonclass (tree);
320
extern tree lookup_name_innermost_nonclass_level (tree);
321
extern bool is_local_extern (tree);
322
extern tree lookup_function_nonclass (tree, VEC(tree,gc) *, bool);
323
extern void push_local_binding (tree, tree, int);
324
extern bool pushdecl_class_level (tree);
325
extern tree pushdecl_namespace_level (tree, bool);
326
extern bool push_class_level_binding (tree, tree);
327
extern tree getdecls (void);
328
extern tree cp_namespace_decls (tree);
329
extern void set_decl_namespace (tree, tree, bool);
330
extern void push_decl_namespace (tree);
331
extern void pop_decl_namespace (void);
332
extern void do_namespace_alias (tree, tree);
333
extern void do_toplevel_using_decl (tree, tree, tree);
334
extern void do_local_using_decl (tree, tree, tree);
335
extern tree do_class_using_decl (tree, tree);
336
extern void do_using_directive (tree);
337
extern tree lookup_arg_dependent (tree, tree, VEC(tree,gc) *);
338
extern bool is_associated_namespace (tree, tree);
339
extern void parse_using_directive (tree, tree);
340
extern tree innermost_non_namespace_value (tree);
341
extern cxx_binding *outer_binding (tree, cxx_binding *, bool);
342
extern void cp_emit_debug_info_for_using (tree, tree);
343
 
344
/* Set *DECL to the (non-hidden) declaration for ID at global scope,
345
   if present and return true; otherwise return false.  */
346
 
347
static inline bool
348
get_global_value_if_present (tree id, tree *decl)
349
{
350
  tree global_value = namespace_binding (id, global_namespace);
351
  if (global_value)
352
    *decl = global_value;
353
  return global_value != NULL;
354
}
355
 
356
/* True is the binding of IDENTIFIER at global scope names a type.  */
357
 
358
static inline bool
359
is_typename_at_global_scope (tree id)
360
{
361
  tree global_value = namespace_binding (id, global_namespace);
362
 
363
  return global_value && TREE_CODE (global_value) == TYPE_DECL;
364
}
365
 
366
#endif /* GCC_CP_NAME_LOOKUP_H */

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