/* Definitions for C parsing and type checking.
Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
#define GCC_C_TREE_H
#include "c-common.h"
+#include "diagnostic.h"
-/* Language-dependent contents of an identifier. */
+/* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
+ know how big it is. This is sanity-checked in c-decl.c. */
+#define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
+ (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
-/* The limbo_value is used for block level extern declarations, which need
- to be type checked against subsequent extern declarations. They can't
- be referenced after they fall out of scope, so they can't be global.
-
- The rid_code field is used for keywords. It is in all
- lang_identifier nodes, because some keywords are only special in a
- particular context. */
-
-struct lang_identifier GTY(())
-{
- struct c_common_identifier common_id;
- tree symbol_value;
- tree tag_value;
- tree label_value;
-};
-
-/* The resulting tree type. */
-
-union lang_tree_node
- GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
- chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *)TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *)TREE_CHAIN (&%h.generic)")))
-{
- union tree_node GTY ((tag ("0"),
- desc ("tree_node_structure (&%h)")))
- generic;
- struct lang_identifier GTY ((tag ("1"))) identifier;
-};
+/* For gc purposes, return the most likely link for the longest chain. */
+#define C_LANG_TREE_NODE_CHAIN_NEXT(T) \
+ ((union lang_tree_node *) \
+ (TREE_CODE (T) == INTEGER_TYPE ? TYPE_NEXT_VARIANT (T) \
+ : TREE_CODE (T) == COMPOUND_EXPR ? TREE_OPERAND (T, 1) \
+ : TREE_CHAIN (T)))
/* Language-specific declaration information. */
tree pending_sizes;
};
-/* Macros for access to language-specific slots in an identifier. */
-/* Each of these slots contains a DECL node or null. */
-
-/* The value of the identifier in the namespace of "ordinary identifiers"
- (data objects, enum constants, functions, typedefs). */
-#define IDENTIFIER_SYMBOL_VALUE(NODE) \
- (((struct lang_identifier *) (NODE))->symbol_value)
-/* The value of the identifier in the namespace of struct, union,
- and enum tags. */
-#define IDENTIFIER_TAG_VALUE(NODE) \
- (((struct lang_identifier *) (NODE))->tag_value)
-/* The value of the identifier in the namespace of labels. */
-#define IDENTIFIER_LABEL_VALUE(NODE) \
- (((struct lang_identifier *) (NODE))->label_value)
-
-/* In identifiers, C uses the following fields in a special way:
- TREE_PUBLIC to record that there was a previous local extern decl.
- TREE_USED to record that such a decl was used.
- TREE_ADDRESSABLE to record that the address of such a decl was used. */
-
/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
and C_RID_YYCODE is the token number wanted by Yacc. */
#define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
-/* In a RECORD_TYPE, a sorted array of the fields of the type. */
struct lang_type GTY(())
{
- struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
+ /* In a RECORD_TYPE, a sorted array of the fields of the type. */
+ struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
+ /* In an ENUMERAL_TYPE, the min and max values. */
+ tree enum_min;
+ tree enum_max;
};
/* Record whether a type or decl was written with nonconstant size.
#define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
#define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
-/* Store a value in that field. */
-#define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
- (TREE_COMPLEXITY (EXP) = (int) (CODE))
-
/* Record whether a typedef for type `int' was actually `signed int'. */
#define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
/* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
#define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
-/* Nonzero for a declaration of an external object which is not
- currently in scope. This is either a built-in declaration of
- a library function, before a real declaration has been seen,
- or a declaration that appeared in an inner scope that has ended. */
-#define C_DECL_INVISIBLE(EXP) DECL_LANG_FLAG_3 (EXP)
+/* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
+ been declared. */
+#define C_DECL_DECLARED_BUILTIN(EXP) DECL_LANG_FLAG_3 (EXP)
+
+/* Record whether a decl was declared register. This is strictly a
+ front-end flag, whereas DECL_REGISTER is used for code generation;
+ they may differ for structures with volatile fields. */
+#define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
+
+/* Record whether a decl was used in an expression anywhere except an
+ unevaluated operand of sizeof / typeof / alignof. This is only
+ used for functions declared static but not defined, though outside
+ sizeof and typeof it is set for other function decls as well. */
+#define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (EXP)
/* Nonzero for a decl which either doesn't exist or isn't a prototype.
N.B. Could be simplified if all built-in decls had complete prototypes
/* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
TYPE_ARG_TYPES for functions with prototypes, but created for functions
without prototypes. */
-#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
+#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
+
+/* Record parser information about an expression that is irrelevant
+ for code generation alongside a tree representing its value. */
+struct c_expr
+{
+ /* The value of the expression. */
+ tree value;
+ /* Record the original binary operator of an expression, which may
+ have been changed by fold, STRING_CST for unparenthesised string
+ constants, or ERROR_MARK for other expressions (including
+ parenthesized expressions). */
+ enum tree_code original_code;
+};
-/* Values for the first parameter to poplevel. */
-#define KEEP_NO 0
-#define KEEP_YES 1
-#define KEEP_MAYBE 2
+/* A storage class specifier. */
+enum c_storage_class {
+ csc_none,
+ csc_auto,
+ csc_extern,
+ csc_register,
+ csc_static,
+ csc_typedef
+};
+
+/* A sequence of declaration specifiers in C. */
+struct c_declspecs {
+ /* The type specified, not reflecting modifiers such as "short" and
+ "unsigned", or NULL_TREE if none. */
+ tree type;
+ /* The attributes from a typedef decl. */
+ tree decl_attr;
+ /* When parsing, the attributes. Outside the parser, this will be
+ NULL; attributes (possibly from multiple lists) will be passed
+ separately. */
+ tree attrs;
+ /* The modifier bits present. */
+ int specbits;
+ /* The storage class specifier, or csc_none if none. */
+ enum c_storage_class storage_class;
+ /* Whether something other than a storage class specifier or
+ attribute has been seen. This is used to warn for the
+ obsolescent usage of storage class specifiers other than at the
+ start of the list. (Doing this properly would require function
+ specifiers to be handled separately from storage class
+ specifiers.) */
+ BOOL_BITFIELD non_sc_seen_p : 1;
+ /* Whether the type is specified by a typedef. */
+ BOOL_BITFIELD typedef_p : 1;
+ /* Whether the type is specified by a typedef whose type is
+ explicitly "signed". */
+ BOOL_BITFIELD typedef_signed_p : 1;
+ /* Whether the specifiers include a deprecated typedef. */
+ BOOL_BITFIELD deprecated_p : 1;
+ /* Whether "int" was explicitly specified. */
+ BOOL_BITFIELD explicit_int_p : 1;
+ /* Whether "char" was explicitly specified. */
+ BOOL_BITFIELD explicit_char_p : 1;
+ /* Whether "long" was specified more than once. */
+ BOOL_BITFIELD long_long_p : 1;
+ /* Whether "inline" was specified. */
+ BOOL_BITFIELD inline_p : 1;
+ /* Whether "__thread" was specified. */
+ BOOL_BITFIELD thread_p : 1;
+};
+
+/* The various kinds of declarators in C. */
+enum c_declarator_kind {
+ /* An identifier. */
+ cdk_id,
+ /* A function. */
+ cdk_function,
+ /* An array. */
+ cdk_array,
+ /* A pointer. */
+ cdk_pointer,
+ /* Parenthesized declarator with nested attributes. */
+ cdk_attrs
+};
+
+/* Information about the parameters in a function declarator. */
+struct c_arg_info {
+ /* A list of parameter decls. */
+ tree parms;
+ /* A list of structure, union and enum tags defined. */
+ tree tags;
+ /* A list of argument types to go in the FUNCTION_TYPE. */
+ tree types;
+ /* A list of non-parameter decls (notably enumeration constants)
+ defined with the parameters. */
+ tree others;
+};
+
+/* A declarator. */
+struct c_declarator {
+ /* The kind of declarator. */
+ enum c_declarator_kind kind;
+ /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */
+ struct c_declarator *declarator;
+ union {
+ /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
+ declarator. */
+ tree id;
+ /* For functions. */
+ struct c_arg_info *arg_info;
+ /* For arrays. */
+ struct {
+ /* The array dimension, or NULL for [] and [*]. */
+ tree dimen;
+ /* The qualifiers (and attributes, currently ignored) inside []. */
+ struct c_declspecs *quals;
+ /* Whether [static] was used. */
+ BOOL_BITFIELD static_p : 1;
+ /* Whether [*] was used. */
+ BOOL_BITFIELD vla_unspec_p : 1;
+ } array;
+ /* For pointers, the qualifiers on the pointer type. */
+ struct c_declspecs *pointer_quals;
+ /* For attributes. */
+ tree attrs;
+ } u;
+};
+
+/* A type name. */
+struct c_type_name {
+ /* The declaration specifiers. */
+ struct c_declspecs *specs;
+ /* The declarator. */
+ struct c_declarator *declarator;
+};
+
+/* A parameter. */
+struct c_parm {
+ /* The declaration specifiers, minus any prefix attributes. */
+ struct c_declspecs *specs;
+ /* The attributes. */
+ tree attrs;
+ /* The declarator. */
+ struct c_declarator *declarator;
+};
+
+/* Save and restore the variables in this file and elsewhere
+ that keep track of the progress of compilation of the current function.
+ Used for nested functions. */
+
+struct language_function GTY(())
+{
+ struct c_language_function base;
+ tree x_break_label;
+ tree x_cont_label;
+ struct c_switch * GTY((skip)) x_switch_stack;
+ struct c_arg_info * GTY((skip)) arg_info;
+ int returns_value;
+ int returns_null;
+ int returns_abnormally;
+ int warn_about_return_type;
+ int extern_inline;
+};
\f
/* in c-parse.in */
extern void gen_aux_info_record (tree, int, int, int);
/* in c-decl.c */
+extern struct obstack parser_obstack;
+extern tree c_break_label;
+extern tree c_cont_label;
+
extern int global_bindings_p (void);
-extern tree getdecls (void);
-extern void pushlevel (int);
+extern void push_scope (void);
+extern tree pop_scope (void);
extern void insert_block (tree);
-extern void set_block (tree);
extern tree pushdecl (tree);
extern void c_expand_body (tree);
extern void c_init_decl_processing (void);
extern void c_dup_lang_specific_decl (tree);
extern void c_print_identifier (FILE *, tree, int);
-extern tree build_array_declarator (tree, tree, int, int);
+extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
+ bool, bool);
extern tree build_enumerator (tree, tree);
extern void check_for_loop_decls (void);
extern void mark_forward_parm_decls (void);
extern tree finish_enum (tree, tree, tree);
extern void finish_function (void);
extern tree finish_struct (tree, tree, tree);
-extern tree get_parm_info (int);
-extern tree grokfield (tree, tree, tree);
-extern tree groktypename (tree);
-extern tree groktypename_in_parm_context (tree);
+extern struct c_arg_info *get_parm_info (bool);
+extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
+extern tree groktypename (struct c_type_name *);
+extern tree grokparm (const struct c_parm *);
extern tree implicitly_declare (tree);
-extern int in_parm_level_p (void);
extern void keep_next_level (void);
extern tree lookup_name (tree);
extern void pending_xref_error (void);
extern void c_push_function_context (struct function *);
extern void c_pop_function_context (struct function *);
-extern void push_parm_decl (tree);
+extern void push_parm_decl (const struct c_parm *);
extern tree pushdecl_top_level (tree);
-extern void pushtag (tree, tree);
-extern tree set_array_declarator_type (tree, tree, int);
-extern void shadow_tag (tree);
-extern void shadow_tag_warned (tree, int);
+extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
+ struct c_declarator *,
+ bool);
+extern tree builtin_function (const char *, tree, int, enum built_in_class,
+ const char *, tree);
+extern void shadow_tag (const struct c_declspecs *);
+extern void shadow_tag_warned (const struct c_declspecs *, int);
extern tree start_enum (tree);
-extern int start_function (tree, tree, tree);
-extern tree start_decl (tree, tree, int, tree);
+extern int start_function (struct c_declspecs *, struct c_declarator *, tree);
+extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
+ tree);
extern tree start_struct (enum tree_code, tree);
extern void store_parm_decls (void);
+extern void store_parm_decls_from (struct c_arg_info *);
extern tree xref_tag (enum tree_code, tree);
-extern tree c_begin_compound_stmt (void);
-extern void c_expand_deferred_function (tree);
-extern void c_expand_decl_stmt (tree);
-extern void c_static_assembler_name (tree);
-extern tree make_pointer_declarator (tree, tree);
-extern void merge_translation_unit_decls (void);
+extern int c_expand_decl (tree);
+extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
+ struct c_declarator *);
+extern struct c_declarator *build_attrs_declarator (tree,
+ struct c_declarator *);
+extern struct c_declarator *build_function_declarator (struct c_arg_info *,
+ struct c_declarator *);
+extern struct c_declarator *build_id_declarator (tree);
+extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
+ struct c_declarator *);
+extern struct c_declspecs *build_null_declspecs (void);
+extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
+extern struct c_declspecs *declspecs_add_type (struct c_declspecs *, tree);
+extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
+extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
/* in c-objc-common.c */
extern int c_disregard_inline_limits (tree);
extern int c_cannot_inline_tree_fn (tree *);
extern bool c_objc_common_init (void);
-extern int c_missing_noreturn_ok_p (tree);
-extern void c_objc_common_finish_file (void);
+extern bool c_missing_noreturn_ok_p (tree);
+extern tree c_objc_common_truthvalue_conversion (tree expr);
extern int defer_fn (tree);
extern bool c_warn_unused_global_decl (tree);
+extern void c_initialize_diagnostics (diagnostic_context *);
#define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
c_build_qualified_type ((TYPE), \
((CONST_P) ? TYPE_QUAL_CONST : 0) | \
((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
-#define c_sizeof_nowarn(T) c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
-
/* in c-typeck.c */
+extern int in_alignof;
+extern int in_sizeof;
+extern int in_typeof;
-/* For use with comptypes. */
-enum {
- COMPARE_STRICT = 0
-};
+extern struct c_switch *c_switch_stack;
extern tree require_complete_type (tree);
-extern int comptypes (tree, tree, int);
+extern int same_translation_unit_p (tree, tree);
+extern int comptypes (tree, tree);
extern tree c_size_in_bytes (tree);
extern bool c_mark_addressable (tree);
extern void c_incomplete_type_error (tree, tree);
extern tree c_type_promotes_to (tree);
+extern tree composite_type (tree, tree);
extern tree build_component_ref (tree, tree);
extern tree build_indirect_ref (tree, const char *);
extern tree build_array_ref (tree, tree);
extern tree build_external_ref (tree, int);
-extern tree parser_build_binary_op (enum tree_code, tree, tree);
-extern int c_tree_expr_nonnegative_p (tree);
-extern void readonly_warning (tree, const char *);
+extern void record_maybe_used_decl (tree);
+extern void pop_maybe_used (bool);
+extern struct c_expr c_expr_sizeof_expr (struct c_expr);
+extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
+extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
+ struct c_expr);
+extern void readonly_error (tree, const char *);
extern tree build_conditional_expr (tree, tree, tree);
-extern tree build_compound_expr (tree);
-extern tree c_cast_expr (tree, tree);
+extern tree build_compound_expr (tree, tree);
+extern tree c_cast_expr (struct c_type_name *, tree);
extern tree build_c_cast (tree, tree);
extern tree build_modify_expr (tree, enum tree_code, tree);
extern void store_init_value (tree, tree);
extern void error_init (const char *);
extern void pedwarn_init (const char *);
+extern void maybe_warn_string_init (tree, struct c_expr);
extern void start_init (tree, tree, int);
extern void finish_init (void);
extern void really_start_incremental_init (tree);
extern void push_init_level (int);
-extern tree pop_init_level (int);
+extern struct c_expr pop_init_level (int);
extern void set_init_index (tree, tree);
extern void set_init_label (tree);
-extern void process_init_element (tree);
+extern void process_init_element (struct c_expr);
extern tree build_compound_literal (tree, tree);
extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_PRINTF_1;
extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_PRINTF_1;
extern tree c_start_case (tree);
-extern void c_finish_case (void);
-extern tree simple_asm_stmt (tree);
-extern tree build_asm_stmt (tree, tree, tree, tree, tree);
+extern void c_finish_case (tree);
+extern tree build_asm_expr (tree, tree, tree, tree, bool);
+extern tree build_asm_stmt (tree, tree);
extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
+extern int c_types_compatible_p (tree, tree);
+extern tree c_begin_compound_stmt (bool);
+extern tree c_end_compound_stmt (tree, bool);
+extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
+extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
+extern tree c_begin_stmt_expr (void);
+extern tree c_finish_stmt_expr (tree);
+extern tree c_process_expr_stmt (tree);
+extern tree c_finish_expr_stmt (tree);
+extern tree c_finish_return (tree);
+extern tree c_finish_bc_stmt (tree *, bool);
+extern tree c_finish_goto_label (tree);
+extern tree c_finish_goto_ptr (tree);
/* Set to 0 at beginning of a function definition, set to 1 if
a return statement that specifies a return value is seen. */
extern int system_header_p;
+/* True means global_bindings_p should return false even if the scope stack
+ says we are in file scope. */
+
+extern bool c_override_global_bindings_to_false;
+
+/* True means we've initialized exception handling. */
+extern bool c_eh_initialized_p;
+
/* In c-decl.c */
extern void c_finish_incomplete_decl (tree);
-extern void *get_current_scope (void);
-extern void objc_mark_locals_volatile (void *);
extern void c_write_global_declarations (void);
-extern GTY(()) tree static_ctors;
-extern GTY(()) tree static_dtors;
-
/* In order for the format checking to accept the C frontend
diagnostic framework extensions, you must include this file before
toplev.h, not after. */
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