1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
27 #include "diagnostic.h"
29 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
30 know how big it is. This is sanity-checked in c-decl.c. */
31 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
32 (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
34 /* Language-specific declaration information. */
36 struct GTY(()) lang_decl {
40 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
41 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
43 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
44 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
46 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
47 nonzero if the definition of the type has already started. */
48 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
50 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
51 declarations whose type would be completed by completing that type. */
52 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
54 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
55 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
56 and C_RID_YYCODE is the token number wanted by Yacc. */
57 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
59 struct GTY(()) lang_type {
60 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
61 struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
62 /* In an ENUMERAL_TYPE, the min and max values. */
65 /* In a RECORD_TYPE, information specific to Objective-C, such
66 as a list of adopted protocols or a pointer to a corresponding
67 @interface. See objc/objc-act.h for details. */
71 /* Record whether a type or decl was written with nonconstant size.
72 Note that TYPE_SIZE may have simplified to a constant. */
73 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
74 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
76 /* Record whether a typedef for type `int' was actually `signed int'. */
77 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
79 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
81 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
83 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
84 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
86 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
88 #define C_DECL_DECLARED_BUILTIN(EXP) \
89 DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
91 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
92 built-in prototype and does not have a non-built-in prototype. */
93 #define C_DECL_BUILTIN_PROTOTYPE(EXP) \
94 DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
96 /* Record whether a decl was declared register. This is strictly a
97 front-end flag, whereas DECL_REGISTER is used for code generation;
98 they may differ for structures with volatile fields. */
99 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
101 /* Record whether a decl was used in an expression anywhere except an
102 unevaluated operand of sizeof / typeof / alignof. This is only
103 used for functions declared static but not defined, though outside
104 sizeof and typeof it is set for other function decls as well. */
105 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
107 /* Record whether a label was defined in a statement expression which
108 has finished and so can no longer be jumped to. */
109 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP) \
110 DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
112 /* Record whether a label was the subject of a goto from outside the
113 current level of statement expression nesting and so cannot be
114 defined right now. */
115 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP) \
116 DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
118 /* Record whether a label was defined in the scope of an identifier
119 with variably modified type which has finished and so can no longer
121 #define C_DECL_UNJUMPABLE_VM(EXP) \
122 DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP))
124 /* Record whether a label was the subject of a goto from outside the
125 current level of scopes of identifiers with variably modified type
126 and so cannot be defined right now. */
127 #define C_DECL_UNDEFINABLE_VM(EXP) \
128 DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP))
130 /* Record whether a variable has been declared threadprivate by
131 #pragma omp threadprivate. */
132 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
134 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
135 N.B. Could be simplified if all built-in decls had complete prototypes
136 (but this is presently difficult because some of them need FILE*). */
137 #define C_DECL_ISNT_PROTOTYPE(EXP) \
139 || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0 \
140 && !DECL_BUILT_IN (EXP)))
142 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
143 TYPE_ARG_TYPES for functions with prototypes, but created for functions
144 without prototypes. */
145 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
147 /* For a CONSTRUCTOR, whether some initializer contains a
148 subexpression meaning it is not a constant expression. */
149 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
151 /* Record parser information about an expression that is irrelevant
152 for code generation alongside a tree representing its value. */
155 /* The value of the expression. */
157 /* Record the original unary/binary operator of an expression, which may
158 have been changed by fold, STRING_CST for unparenthesized string
159 constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
160 (even if parenthesized), for subexpressions, and for non-constant
161 initializers, or ERROR_MARK for other expressions (including
162 parenthesized expressions). */
163 enum tree_code original_code;
164 /* If not NULL, the original type of an expression. This will
165 differ from the type of the value field for an enum constant.
166 The type of an enum constant is a plain integer type, but this
167 field will be the enum type. */
171 /* A kind of type specifier. Note that this information is currently
172 only used to distinguish tag definitions, tag references and typeof
174 enum c_typespec_kind {
175 /* A reserved keyword type specifier. */
177 /* A reference to a tag, previously declared, such as "struct foo".
178 This includes where the previous declaration was as a different
179 kind of tag, in which case this is only valid if shadowing that
180 tag in an inner scope. */
182 /* A reference to a tag, not previously declared in a visible
185 /* A definition of a tag such as "struct foo { int a; }". */
187 /* A typedef name. */
189 /* An ObjC-specific kind of type specifier. */
191 /* A typeof specifier. */
195 /* A type specifier: this structure is created in the parser and
196 passed to declspecs_add_type only. */
198 /* What kind of type specifier this is. */
199 enum c_typespec_kind kind;
200 /* The specifier itself. */
202 /* An expression to be evaluated before the type specifier, in the
203 case of typeof specifiers, or NULL otherwise or if no such
204 expression is required for a particular typeof specifier. In
205 particular, when typeof is applied to an expression of variably
206 modified type, that expression must be evaluated in order to
207 determine array sizes that form part of the type, but the
208 expression itself (as opposed to the array sizes) forms no part
209 of the type and so needs to be recorded separately. */
211 /* Whether the expression has operands suitable for use in constant
213 bool expr_const_operands;
216 /* A storage class specifier. */
217 enum c_storage_class {
226 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
227 "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
229 enum c_typespec_keyword {
244 /* A sequence of declaration specifiers in C. */
246 /* The type specified, if a single type specifier such as a struct,
247 union or enum specifier, typedef name or typeof specifies the
248 whole type, or NULL_TREE if none or a keyword such as "void" or
249 "char" is used. Does not include qualifiers. */
251 /* Any expression to be evaluated before the type, from a typeof
254 /* The attributes from a typedef decl. */
256 /* When parsing, the attributes. Outside the parser, this will be
257 NULL; attributes (possibly from multiple lists) will be passed
260 /* Any type specifier keyword used such as "int", not reflecting
261 modifiers such as "short", or cts_none if none. */
262 enum c_typespec_keyword typespec_word;
263 /* The storage class specifier, or csc_none if none. */
264 enum c_storage_class storage_class;
265 /* Whether any expressions in typeof specifiers may appear in
266 constant expressions. */
267 BOOL_BITFIELD expr_const_operands : 1;
268 /* Whether any declaration specifiers have been seen at all. */
269 BOOL_BITFIELD declspecs_seen_p : 1;
270 /* Whether a type specifier has been seen. */
271 BOOL_BITFIELD type_seen_p : 1;
272 /* Whether something other than a storage class specifier or
273 attribute has been seen. This is used to warn for the
274 obsolescent usage of storage class specifiers other than at the
275 start of the list. (Doing this properly would require function
276 specifiers to be handled separately from storage class
278 BOOL_BITFIELD non_sc_seen_p : 1;
279 /* Whether the type is specified by a typedef or typeof name. */
280 BOOL_BITFIELD typedef_p : 1;
281 /* Whether a struct, union or enum type either had its content
282 defined by a type specifier in the list or was the first visible
283 declaration of its tag. */
284 BOOL_BITFIELD tag_defined_p : 1;
285 /* Whether the type is explicitly "signed" or specified by a typedef
286 whose type is explicitly "signed". */
287 BOOL_BITFIELD explicit_signed_p : 1;
288 /* Whether the specifiers include a deprecated typedef. */
289 BOOL_BITFIELD deprecated_p : 1;
290 /* Whether the type defaulted to "int" because there were no type
292 BOOL_BITFIELD default_int_p;
293 /* Whether "long" was specified. */
294 BOOL_BITFIELD long_p : 1;
295 /* Whether "long" was specified more than once. */
296 BOOL_BITFIELD long_long_p : 1;
297 /* Whether "short" was specified. */
298 BOOL_BITFIELD short_p : 1;
299 /* Whether "signed" was specified. */
300 BOOL_BITFIELD signed_p : 1;
301 /* Whether "unsigned" was specified. */
302 BOOL_BITFIELD unsigned_p : 1;
303 /* Whether "complex" was specified. */
304 BOOL_BITFIELD complex_p : 1;
305 /* Whether "inline" was specified. */
306 BOOL_BITFIELD inline_p : 1;
307 /* Whether "__thread" was specified. */
308 BOOL_BITFIELD thread_p : 1;
309 /* Whether "const" was specified. */
310 BOOL_BITFIELD const_p : 1;
311 /* Whether "volatile" was specified. */
312 BOOL_BITFIELD volatile_p : 1;
313 /* Whether "restrict" was specified. */
314 BOOL_BITFIELD restrict_p : 1;
315 /* Whether "_Sat" was specified. */
316 BOOL_BITFIELD saturating_p : 1;
319 /* The various kinds of declarators in C. */
320 enum c_declarator_kind {
329 /* Parenthesized declarator with nested attributes. */
333 /* Information about the parameters in a function declarator. */
335 /* A list of parameter decls. */
337 /* A list of structure, union and enum tags defined. */
339 /* A list of argument types to go in the FUNCTION_TYPE. */
341 /* A list of non-parameter decls (notably enumeration constants)
342 defined with the parameters. */
344 /* A list of VLA sizes from the parameters. In a function
345 definition, these are used to ensure that side-effects in sizes
346 of arrays converted to pointers (such as a parameter int i[n++])
347 take place; otherwise, they are ignored. */
349 /* True when these arguments had [*]. */
350 BOOL_BITFIELD had_vla_unspec : 1;
354 struct c_declarator {
355 /* The kind of declarator. */
356 enum c_declarator_kind kind;
357 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */
358 struct c_declarator *declarator;
359 location_t id_loc; /* Currently only set for cdk_id. */
361 /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
365 struct c_arg_info *arg_info;
368 /* The array dimension, or NULL for [] and [*]. */
370 /* The qualifiers inside []. */
372 /* The attributes (currently ignored) inside []. */
374 /* Whether [static] was used. */
375 BOOL_BITFIELD static_p : 1;
376 /* Whether [*] was used. */
377 BOOL_BITFIELD vla_unspec_p : 1;
379 /* For pointers, the qualifiers on the pointer type. */
381 /* For attributes. */
388 /* The declaration specifiers. */
389 struct c_declspecs *specs;
390 /* The declarator. */
391 struct c_declarator *declarator;
396 /* The declaration specifiers, minus any prefix attributes. */
397 struct c_declspecs *specs;
398 /* The attributes. */
400 /* The declarator. */
401 struct c_declarator *declarator;
404 /* Save and restore the variables in this file and elsewhere
405 that keep track of the progress of compilation of the current function.
406 Used for nested functions. */
408 struct GTY(()) language_function {
409 struct c_language_function base;
412 struct c_switch * GTY((skip)) x_switch_stack;
413 struct c_arg_info * GTY((skip)) arg_info;
416 int returns_abnormally;
417 int warn_about_return_type;
420 /* Save lists of labels used or defined in particular contexts.
421 Allocated on the parser obstack. */
425 /* The label at the head of the list. */
427 /* The rest of the list. */
428 struct c_label_list *next;
431 /* Statement expression context. */
433 struct c_label_context_se
435 /* The labels defined at this level of nesting. */
436 struct c_label_list *labels_def;
437 /* The labels used at this level of nesting. */
438 struct c_label_list *labels_used;
439 /* The next outermost context. */
440 struct c_label_context_se *next;
443 /* Context of variably modified declarations. */
445 struct c_label_context_vm
447 /* The labels defined at this level of nesting. */
448 struct c_label_list *labels_def;
449 /* The labels used at this level of nesting. */
450 struct c_label_list *labels_used;
451 /* The scope of this context. Multiple contexts may be at the same
452 numbered scope, since each variably modified declaration starts a
455 /* The next outermost context. */
456 struct c_label_context_vm *next;
459 /* Used when parsing an enum. Initialized by start_enum. */
460 struct c_enum_contents
462 /* While defining an enum type, this is 1 plus the last enumerator
464 tree enum_next_value;
466 /* Nonzero means that there was overflow computing enum_next_value. */
472 extern void c_parse_init (void);
474 /* in c-aux-info.c */
475 extern void gen_aux_info_record (tree, int, int, int);
478 extern struct obstack parser_obstack;
479 extern tree c_break_label;
480 extern tree c_cont_label;
482 extern int global_bindings_p (void);
483 extern void push_scope (void);
484 extern tree pop_scope (void);
486 extern void c_init_decl_processing (void);
487 extern void c_dup_lang_specific_decl (tree);
488 extern void c_print_identifier (FILE *, tree, int);
489 extern int quals_from_declspecs (const struct c_declspecs *);
490 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
492 extern tree build_enumerator (struct c_enum_contents *, tree, tree, location_t);
493 extern tree check_for_loop_decls (void);
494 extern void mark_forward_parm_decls (void);
495 extern void declare_parm_level (void);
496 extern void undeclared_variable (tree, location_t);
497 extern tree declare_label (tree);
498 extern tree define_label (location_t, tree);
499 extern void c_maybe_initialize_eh (void);
500 extern void finish_decl (tree, tree, tree, tree);
501 extern tree finish_enum (tree, tree, tree);
502 extern void finish_function (void);
503 extern tree finish_struct (tree, tree, tree);
504 extern struct c_arg_info *get_parm_info (bool);
505 extern tree grokfield (location_t, struct c_declarator *,
506 struct c_declspecs *, tree, tree *);
507 extern tree groktypename (struct c_type_name *, tree *, bool *);
508 extern tree grokparm (const struct c_parm *);
509 extern tree implicitly_declare (tree);
510 extern void keep_next_level (void);
511 extern void pending_xref_error (void);
512 extern void c_push_function_context (void);
513 extern void c_pop_function_context (void);
514 extern void push_parm_decl (const struct c_parm *);
515 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
516 struct c_declarator *);
517 extern tree c_builtin_function (tree);
518 extern tree c_builtin_function_ext_scope (tree);
519 extern void shadow_tag (const struct c_declspecs *);
520 extern void shadow_tag_warned (const struct c_declspecs *, int);
521 extern tree start_enum (struct c_enum_contents *, tree);
522 extern int start_function (struct c_declspecs *, struct c_declarator *, tree);
523 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
525 extern tree start_struct (enum tree_code, tree);
526 extern void store_parm_decls (void);
527 extern void store_parm_decls_from (struct c_arg_info *);
528 extern tree xref_tag (enum tree_code, tree);
529 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
530 extern int c_expand_decl (tree);
531 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
532 struct c_declarator *);
533 extern struct c_declarator *build_attrs_declarator (tree,
534 struct c_declarator *);
535 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
536 struct c_declarator *);
537 extern struct c_declarator *build_id_declarator (tree);
538 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
539 struct c_declarator *);
540 extern struct c_declspecs *build_null_declspecs (void);
541 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
542 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
544 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
545 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
546 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
548 /* in c-objc-common.c */
549 extern bool c_objc_common_init (void);
550 extern bool c_missing_noreturn_ok_p (tree);
551 extern bool c_warn_unused_global_decl (const_tree);
552 extern void c_initialize_diagnostics (diagnostic_context *);
553 extern bool c_vla_unspec_p (tree x, tree fn);
555 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
556 c_build_qualified_type ((TYPE), \
557 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
558 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
561 extern bool in_late_binary_op;
562 extern int in_alignof;
563 extern int in_sizeof;
564 extern int in_typeof;
566 extern struct c_switch *c_switch_stack;
567 extern struct c_label_context_se *label_context_stack_se;
568 extern struct c_label_context_vm *label_context_stack_vm;
570 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
571 extern tree require_complete_type (tree);
572 extern int same_translation_unit_p (const_tree, const_tree);
573 extern int comptypes (tree, tree);
574 extern bool c_vla_type_p (const_tree);
575 extern bool c_mark_addressable (tree);
576 extern void c_incomplete_type_error (const_tree, const_tree);
577 extern tree c_type_promotes_to (tree);
578 extern struct c_expr default_function_array_conversion (struct c_expr);
579 extern tree composite_type (tree, tree);
580 extern tree build_component_ref (tree, tree);
581 extern tree build_array_ref (tree, tree, location_t);
582 extern tree build_external_ref (tree, int, location_t, tree *);
583 extern void pop_maybe_used (bool);
584 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
585 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
586 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr,
588 extern struct c_expr parser_build_binary_op (location_t,
589 enum tree_code, struct c_expr,
591 extern tree build_conditional_expr (tree, bool, tree, tree);
592 extern tree build_compound_expr (tree, tree);
593 extern tree c_cast_expr (struct c_type_name *, tree);
594 extern tree build_c_cast (tree, tree);
595 extern void store_init_value (tree, tree, tree);
596 extern void error_init (const char *);
597 extern void pedwarn_init (location_t, int opt, const char *);
598 extern void maybe_warn_string_init (tree, struct c_expr);
599 extern void start_init (tree, tree, int);
600 extern void finish_init (void);
601 extern void really_start_incremental_init (tree);
602 extern void push_init_level (int);
603 extern struct c_expr pop_init_level (int);
604 extern void set_init_index (tree, tree);
605 extern void set_init_label (tree);
606 extern void process_init_element (struct c_expr, bool);
607 extern tree build_compound_literal (tree, tree, bool);
608 extern tree c_start_case (tree);
609 extern void c_finish_case (tree);
610 extern tree build_asm_expr (tree, tree, tree, tree, bool);
611 extern tree build_asm_stmt (tree, tree);
612 extern int c_types_compatible_p (tree, tree);
613 extern tree c_begin_compound_stmt (bool);
614 extern tree c_end_compound_stmt (tree, bool);
615 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
616 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
617 extern tree c_begin_stmt_expr (void);
618 extern tree c_finish_stmt_expr (tree);
619 extern tree c_process_expr_stmt (tree);
620 extern tree c_finish_expr_stmt (tree);
621 extern tree c_finish_return (tree, tree);
622 extern tree c_finish_bc_stmt (tree *, bool);
623 extern tree c_finish_goto_label (tree);
624 extern tree c_finish_goto_ptr (tree);
625 extern void c_begin_vm_scope (unsigned int);
626 extern void c_end_vm_scope (unsigned int);
627 extern tree c_expr_to_decl (tree, bool *, bool *);
628 extern tree c_begin_omp_parallel (void);
629 extern tree c_finish_omp_parallel (tree, tree);
630 extern tree c_begin_omp_task (void);
631 extern tree c_finish_omp_task (tree, tree);
632 extern tree c_finish_omp_clauses (tree);
634 /* Set to 0 at beginning of a function definition, set to 1 if
635 a return statement that specifies a return value is seen. */
637 extern int current_function_returns_value;
639 /* Set to 0 at beginning of a function definition, set to 1 if
640 a return statement with no argument is seen. */
642 extern int current_function_returns_null;
644 /* Set to 0 at beginning of a function definition, set to 1 if
645 a call to a noreturn function is seen. */
647 extern int current_function_returns_abnormally;
649 /* Nonzero means we are reading code that came from a system header file. */
651 extern int system_header_p;
653 /* True means global_bindings_p should return false even if the scope stack
654 says we are in file scope. */
656 extern bool c_override_global_bindings_to_false;
658 /* True means we've initialized exception handling. */
659 extern bool c_eh_initialized_p;
662 extern void c_finish_incomplete_decl (tree);
663 extern void c_write_global_declarations (void);
665 /* In order for the format checking to accept the C frontend
666 diagnostic framework extensions, you must include this file before
667 toplev.h, not after. */
668 #if GCC_VERSION >= 4001
669 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
671 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
674 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
675 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
677 extern bool c_cpp_error (cpp_reader *, int, location_t, unsigned int,
678 const char *, va_list *)
679 ATTRIBUTE_GCC_CDIAG(5,0);
681 #endif /* ! GCC_C_TREE_H */