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+/* Declarations for C++ name lookup routines.
+ Copyright (C) 2003-2014 Free Software Foundation, Inc.
+ Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#ifndef GCC_CP_NAME_LOOKUP_H
+#define GCC_CP_NAME_LOOKUP_H
+
+#include "c-family/c-common.h"
+
+/* The type of dictionary used to map names to types declared at
+ a given scope. */
+typedef struct binding_table_s *binding_table;
+typedef struct binding_entry_s *binding_entry;
+
+/* The type of a routine repeatedly called by binding_table_foreach. */
+typedef void (*bt_foreach_proc) (binding_entry, void *);
+
+struct GTY(()) binding_entry_s {
+ binding_entry chain;
+ tree name;
+ tree type;
+};
+
+/* These macros indicate the initial chains count for binding_table. */
+#define SCOPE_DEFAULT_HT_SIZE (1 << 3)
+#define CLASS_SCOPE_HT_SIZE (1 << 3)
+#define NAMESPACE_ORDINARY_HT_SIZE (1 << 5)
+#define NAMESPACE_STD_HT_SIZE (1 << 8)
+#define GLOBAL_SCOPE_HT_SIZE (1 << 8)
+
+extern void binding_table_foreach (binding_table, bt_foreach_proc, void *);
+extern binding_entry binding_table_find (binding_table, tree);
+
+/* Datatype that represents binding established by a declaration between
+ a name and a C++ entity. */
+typedef struct cxx_binding cxx_binding;
+
+/* The datatype used to implement C++ scope. */
+typedef struct cp_binding_level cp_binding_level;
+
+/* Nonzero if this binding is for a local scope, as opposed to a class
+ or namespace scope. */
+#define LOCAL_BINDING_P(NODE) ((NODE)->is_local)
+
+/* True if NODE->value is from a base class of the class which is
+ currently being defined. */
+#define INHERITED_VALUE_BINDING_P(NODE) ((NODE)->value_is_inherited)
+
+struct GTY(()) cxx_binding {
+ /* Link to chain together various bindings for this name. */
+ cxx_binding *previous;
+ /* The non-type entity this name is bound to. */
+ tree value;
+ /* The type entity this name is bound to. */
+ tree type;
+ /* The scope at which this binding was made. */
+ cp_binding_level *scope;
+ unsigned value_is_inherited : 1;
+ unsigned is_local : 1;
+};
+
+/* Datatype used to temporarily save C++ bindings (for implicit
+ instantiations purposes and like). Implemented in decl.c. */
+typedef struct GTY(()) cxx_saved_binding {
+ /* The name of the current binding. */
+ tree identifier;
+ /* The binding we're saving. */
+ cxx_binding *binding;
+ tree real_type_value;
+} cxx_saved_binding;
+
+
+extern tree identifier_type_value (tree);
+extern void set_identifier_type_value (tree, tree);
+extern void pop_binding (tree, tree);
+extern void pop_bindings_and_leave_scope (void);
+extern tree constructor_name (tree);
+extern bool constructor_name_p (tree, tree);
+
+/* The kinds of scopes we recognize. */
+typedef enum scope_kind {
+ sk_block = 0, /* An ordinary block scope. This enumerator must
+ have the value zero because "cp_binding_level"
+ is initialized by using "memset" to set the
+ contents to zero, and the default scope kind
+ is "sk_block". */
+ sk_cleanup, /* A scope for (pseudo-)scope for cleanup. It is
+ pseudo in that it is transparent to name lookup
+ activities. */
+ sk_try, /* A try-block. */
+ sk_catch, /* A catch-block. */
+ sk_for, /* The scope of the variable declared in a
+ for-init-statement. */
+ sk_cond, /* The scope of the variable declared in the condition
+ of an if or switch statement. */
+ sk_function_parms, /* The scope containing function parameters. */
+ sk_class, /* The scope containing the members of a class. */
+ sk_scoped_enum, /* The scope containing the enumertors of a C++0x
+ scoped enumeration. */
+ sk_namespace, /* The scope containing the members of a
+ namespace, including the global scope. */
+ sk_template_parms, /* A scope for template parameters. */
+ sk_template_spec, /* Like sk_template_parms, but for an explicit
+ specialization. Since, by definition, an
+ explicit specialization is introduced by
+ "template <>", this scope is always empty. */
+ sk_omp /* An OpenMP structured block. */
+} scope_kind;
+
+/* The scope where the class/struct/union/enum tag applies. */
+typedef enum tag_scope {
+ ts_current = 0, /* Current scope only. This is for the
+ class-key identifier;
+ case mentioned in [basic.lookup.elab]/2,
+ or the class/enum definition
+ class-key identifier { ... }; */
+ ts_global = 1, /* All scopes. This is the 3.4.1
+ [basic.lookup.unqual] lookup mentioned
+ in [basic.lookup.elab]/2. */
+ ts_within_enclosing_non_class = 2, /* Search within enclosing non-class
+ only, for friend class lookup
+ according to [namespace.memdef]/3
+ and [class.friend]/9. */
+ ts_lambda = 3 /* Declaring a lambda closure. */
+} tag_scope;
+
+typedef struct GTY(()) cp_class_binding {
+ cxx_binding *base;
+ /* The bound name. */
+ tree identifier;
+} cp_class_binding;
+
+
+typedef struct GTY(()) cp_label_binding {
+ /* The bound LABEL_DECL. */
+ tree label;
+ /* The previous IDENTIFIER_LABEL_VALUE. */
+ tree prev_value;
+} cp_label_binding;
+
+
+/* For each binding contour we allocate a binding_level structure
+ which records the names defined in that contour.
+ Contours include:
+ 0) the global one
+ 1) one for each function definition,
+ where internal declarations of the parameters appear.
+ 2) one for each compound statement,
+ to record its declarations.
+
+ The current meaning of a name can be found by searching the levels
+ from the current one out to the global one.
+
+ Off to the side, may be the class_binding_level. This exists only
+ to catch class-local declarations. It is otherwise nonexistent.
+
+ Also there may be binding levels that catch cleanups that must be
+ run when exceptions occur. Thus, to see whether a name is bound in
+ the current scope, it is not enough to look in the
+ CURRENT_BINDING_LEVEL. You should use lookup_name_current_level
+ instead. */
+
+/* Note that the information in the `names' component of the global contour
+ is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
+
+struct GTY(()) cp_binding_level {
+ /* A chain of _DECL nodes for all variables, constants, functions,
+ and typedef types. These are in the reverse of the order
+ supplied. There may be OVERLOADs on this list, too, but they
+ are wrapped in TREE_LISTs; the TREE_VALUE is the OVERLOAD. */
+ tree names;
+
+ /* A chain of NAMESPACE_DECL nodes. */
+ tree namespaces;
+
+ /* An array of static functions and variables (for namespaces only) */
+ vec<tree, va_gc> *static_decls;
+
+ /* A list of USING_DECL nodes. */
+ tree usings;
+
+ /* A list of used namespaces. PURPOSE is the namespace,
+ VALUE the common ancestor with this binding_level's namespace. */
+ tree using_directives;
+
+ /* For the binding level corresponding to a class, the entities
+ declared in the class or its base classes. */
+ vec<cp_class_binding, va_gc> *class_shadowed;
+
+ /* Similar to class_shadowed, but for IDENTIFIER_TYPE_VALUE, and
+ is used for all binding levels. The TREE_PURPOSE is the name of
+ the entity, the TREE_TYPE is the associated type. In addition
+ the TREE_VALUE is the IDENTIFIER_TYPE_VALUE before we entered
+ the class. */
+ tree type_shadowed;
+
+ /* Similar to class_shadowed, but for IDENTIFIER_LABEL_VALUE, and
+ used for all binding levels. */
+ vec<cp_label_binding, va_gc> *shadowed_labels;
+
+ /* For each level (except not the global one),
+ a chain of BLOCK nodes for all the levels
+ that were entered and exited one level down. */
+ tree blocks;
+
+ /* The entity (namespace, class, function) the scope of which this
+ binding contour corresponds to. Otherwise NULL. */
+ tree this_entity;
+
+ /* The binding level which this one is contained in (inherits from). */
+ cp_binding_level *level_chain;
+
+ /* List of VAR_DECLS saved from a previous for statement.
+ These would be dead in ISO-conforming code, but might
+ be referenced in ARM-era code. */
+ vec<tree, va_gc> *dead_vars_from_for;
+
+ /* STATEMENT_LIST for statements in this binding contour.
+ Only used at present for SK_CLEANUP temporary bindings. */
+ tree statement_list;
+
+ /* Binding depth at which this level began. */
+ int binding_depth;
+
+ /* The kind of scope that this object represents. However, a
+ SK_TEMPLATE_SPEC scope is represented with KIND set to
+ SK_TEMPLATE_PARMS and EXPLICIT_SPEC_P set to true. */
+ ENUM_BITFIELD (scope_kind) kind : 4;
+
+ /* True if this scope is an SK_TEMPLATE_SPEC scope. This field is
+ only valid if KIND == SK_TEMPLATE_PARMS. */
+ BOOL_BITFIELD explicit_spec_p : 1;
+
+ /* true means make a BLOCK for this level regardless of all else. */
+ unsigned keep : 1;
+
+ /* Nonzero if this level can safely have additional
+ cleanup-needing variables added to it. */
+ unsigned more_cleanups_ok : 1;
+ unsigned have_cleanups : 1;
+
+ /* 24 bits left to fill a 32-bit word. */
+};
+
+/* The binding level currently in effect. */
+
+#define current_binding_level \
+ (*(cfun && cp_function_chain && cp_function_chain->bindings \
+ ? &cp_function_chain->bindings \
+ : &scope_chain->bindings))
+
+/* The binding level of the current class, if any. */
+
+#define class_binding_level scope_chain->class_bindings
+
+/* The tree node representing the global scope. */
+extern GTY(()) tree global_namespace;
+extern GTY(()) tree global_scope_name;
+
+/* Indicates that there is a type value in some namespace, although
+ that is not necessarily in scope at the moment. */
+
+extern GTY(()) tree global_type_node;
+
+/* True if SCOPE designates the global scope binding contour. */
+#define global_scope_p(SCOPE) \
+ ((SCOPE) == NAMESPACE_LEVEL (global_namespace))
+
+extern cp_binding_level *leave_scope (void);
+extern bool kept_level_p (void);
+extern bool global_bindings_p (void);
+extern bool toplevel_bindings_p (void);
+extern bool namespace_bindings_p (void);
+extern bool local_bindings_p (void);
+extern bool template_parm_scope_p (void);
+extern scope_kind innermost_scope_kind (void);
+extern cp_binding_level *begin_scope (scope_kind, tree);
+extern void print_binding_stack (void);
+extern void push_to_top_level (void);
+extern void pop_from_top_level (void);
+extern void pop_everything (void);
+extern void keep_next_level (bool);
+extern bool is_ancestor (tree, tree);
+extern tree push_scope (tree);
+extern void pop_scope (tree);
+extern tree push_inner_scope (tree);
+extern void pop_inner_scope (tree, tree);
+extern void push_binding_level (cp_binding_level *);
+
+extern void push_namespace (tree);
+extern void pop_namespace (void);
+extern void push_nested_namespace (tree);
+extern void pop_nested_namespace (tree);
+extern bool handle_namespace_attrs (tree, tree);
+extern void pushlevel_class (void);
+extern void poplevel_class (void);
+extern tree pushdecl_with_scope (tree, cp_binding_level *, bool);
+extern tree lookup_name_prefer_type (tree, int);
+extern tree lookup_name_real (tree, int, int, bool, int, int);
+extern tree lookup_type_scope (tree, tag_scope);
+extern tree namespace_binding (tree, tree);
+extern void set_namespace_binding (tree, tree, tree);
+extern bool hidden_name_p (tree);
+extern tree remove_hidden_names (tree);
+extern tree lookup_qualified_name (tree, tree, bool, bool);
+extern tree lookup_name_nonclass (tree);
+extern tree lookup_name_innermost_nonclass_level (tree);
+extern bool is_local_extern (tree);
+extern tree lookup_function_nonclass (tree, vec<tree, va_gc> *, bool);
+extern void push_local_binding (tree, tree, int);
+extern bool pushdecl_class_level (tree);
+extern tree pushdecl_namespace_level (tree, bool);
+extern bool push_class_level_binding (tree, tree);
+extern tree getdecls (void);
+extern int function_parm_depth (void);
+extern tree cp_namespace_decls (tree);
+extern void set_decl_namespace (tree, tree, bool);
+extern void push_decl_namespace (tree);
+extern void pop_decl_namespace (void);
+extern void do_namespace_alias (tree, tree);
+extern void do_toplevel_using_decl (tree, tree, tree);
+extern void do_local_using_decl (tree, tree, tree);
+extern tree do_class_using_decl (tree, tree);
+extern void do_using_directive (tree);
+extern tree lookup_arg_dependent (tree, tree, vec<tree, va_gc> *);
+extern bool is_associated_namespace (tree, tree);
+extern void parse_using_directive (tree, tree);
+extern tree innermost_non_namespace_value (tree);
+extern cxx_binding *outer_binding (tree, cxx_binding *, bool);
+extern void cp_emit_debug_info_for_using (tree, tree);
+
+/* Set *DECL to the (non-hidden) declaration for ID at global scope,
+ if present and return true; otherwise return false. */
+
+inline bool
+get_global_value_if_present (tree id, tree *decl)
+{
+ tree global_value = namespace_binding (id, global_namespace);
+ if (global_value)
+ *decl = global_value;
+ return global_value != NULL;
+}
+
+/* True is the binding of IDENTIFIER at global scope names a type. */
+
+inline bool
+is_typename_at_global_scope (tree id)
+{
+ tree global_value = namespace_binding (id, global_namespace);
+
+ return global_value && TREE_CODE (global_value) == TYPE_DECL;
+}
+
+#endif /* GCC_CP_NAME_LOOKUP_H */