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modify c-parser.c
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Mon, 15 Feb 2010 00:54:17 +0900
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54:f62c169bbc24 57:326d9e06c2e3
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.
5
6 This file is part of GCC.
7
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
11 version.
12
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
16 for more details.
17
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/>. */
21
22 #ifndef GCC_C_TREE_H
23 #define GCC_C_TREE_H
24
25 #include "c-common.h"
26 #include "toplev.h"
27 #include "diagnostic.h"
28
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 *))
33
34 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
35 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
36
37 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
38 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
39
40 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
41 nonzero if the definition of the type has already started. */
42 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
43
44 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
45 declarations whose type would be completed by completing that type. */
46 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
47
48 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
49 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
50 and C_RID_YYCODE is the token number wanted by Yacc. */
51 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
52
53 /* Record whether a type or decl was written with nonconstant size.
54 Note that TYPE_SIZE may have simplified to a constant. */
55 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
56 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
57
58 /* Record whether a type is defined inside a struct or union type.
59 This is used for -Wc++-compat. */
60 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
61
62 /* Record whether a typedef for type `int' was actually `signed int'. */
63 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
64
65 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
66 return type. */
67 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
68
69 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
70 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
71
72 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
73 been declared. */
74 #define C_DECL_DECLARED_BUILTIN(EXP) \
75 DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
76
77 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
78 built-in prototype and does not have a non-built-in prototype. */
79 #define C_DECL_BUILTIN_PROTOTYPE(EXP) \
80 DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
81
82 /* Record whether a decl was declared register. This is strictly a
83 front-end flag, whereas DECL_REGISTER is used for code generation;
84 they may differ for structures with volatile fields. */
85 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
86
87 /* Record whether a decl was used in an expression anywhere except an
88 unevaluated operand of sizeof / typeof / alignof. This is only
89 used for functions declared static but not defined, though outside
90 sizeof and typeof it is set for other function decls as well. */
91 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
92
93 /* Record whether a variable has been declared threadprivate by
94 #pragma omp threadprivate. */
95 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
96
97 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
98 N.B. Could be simplified if all built-in decls had complete prototypes
99 (but this is presently difficult because some of them need FILE*). */
100 #define C_DECL_ISNT_PROTOTYPE(EXP) \
101 (EXP == 0 \
102 || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0 \
103 && !DECL_BUILT_IN (EXP)))
104
105 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
106 TYPE_ARG_TYPES for functions with prototypes, but created for functions
107 without prototypes. */
108 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
109
110 /* For a CONSTRUCTOR, whether some initializer contains a
111 subexpression meaning it is not a constant expression. */
112 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
113
114 /* Record parser information about an expression that is irrelevant
115 for code generation alongside a tree representing its value. */
116 struct c_expr
117 {
118 /* The value of the expression. */
119 tree value;
120 /* Record the original unary/binary operator of an expression, which may
121 have been changed by fold, STRING_CST for unparenthesized string
122 constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
123 (even if parenthesized), for subexpressions, and for non-constant
124 initializers, or ERROR_MARK for other expressions (including
125 parenthesized expressions). */
126 enum tree_code original_code;
127 /* If not NULL, the original type of an expression. This will
128 differ from the type of the value field for an enum constant.
129 The type of an enum constant is a plain integer type, but this
130 field will be the enum type. */
131 tree original_type;
132 };
133
134 /* A kind of type specifier. Note that this information is currently
135 only used to distinguish tag definitions, tag references and typeof
136 uses. */
137 enum c_typespec_kind {
138 /* A reserved keyword type specifier. */
139 ctsk_resword,
140 /* A reference to a tag, previously declared, such as "struct foo".
141 This includes where the previous declaration was as a different
142 kind of tag, in which case this is only valid if shadowing that
143 tag in an inner scope. */
144 ctsk_tagref,
145 /* A reference to a tag, not previously declared in a visible
146 scope. */
147 ctsk_tagfirstref,
148 /* A definition of a tag such as "struct foo { int a; }". */
149 ctsk_tagdef,
150 /* A typedef name. */
151 ctsk_typedef,
152 /* An ObjC-specific kind of type specifier. */
153 ctsk_objc,
154 /* A typeof specifier. */
155 ctsk_typeof
156 };
157
158 /* A type specifier: this structure is created in the parser and
159 passed to declspecs_add_type only. */
160 struct c_typespec {
161 /* What kind of type specifier this is. */
162 enum c_typespec_kind kind;
163 /* The specifier itself. */
164 tree spec;
165 /* An expression to be evaluated before the type specifier, in the
166 case of typeof specifiers, or NULL otherwise or if no such
167 expression is required for a particular typeof specifier. In
168 particular, when typeof is applied to an expression of variably
169 modified type, that expression must be evaluated in order to
170 determine array sizes that form part of the type, but the
171 expression itself (as opposed to the array sizes) forms no part
172 of the type and so needs to be recorded separately. */
173 tree expr;
174 /* Whether the expression has operands suitable for use in constant
175 expressions. */
176 bool expr_const_operands;
177 };
178
179 /* A storage class specifier. */
180 enum c_storage_class {
181 csc_none,
182 csc_auto,
183 csc_extern,
184 csc_register,
185 csc_static,
186 csc_typedef
187 };
188
189 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
190 "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
191 or none of these. */
192 enum c_typespec_keyword {
193 cts_none,
194 cts_void,
195 cts_bool,
196 cts_char,
197 cts_int,
198 cts_float,
199 cts_double,
200 #ifndef noCbC
201 cts_CbC_code,
202 #endif
203 cts_dfloat32,
204 cts_dfloat64,
205 cts_dfloat128,
206 cts_fract,
207 cts_accum
208 };
209
210 /* A sequence of declaration specifiers in C. */
211 struct c_declspecs {
212 /* The type specified, if a single type specifier such as a struct,
213 union or enum specifier, typedef name or typeof specifies the
214 whole type, or NULL_TREE if none or a keyword such as "void" or
215 "char" is used. Does not include qualifiers. */
216 tree type;
217 /* Any expression to be evaluated before the type, from a typeof
218 specifier. */
219 tree expr;
220 /* The attributes from a typedef decl. */
221 tree decl_attr;
222 /* When parsing, the attributes. Outside the parser, this will be
223 NULL; attributes (possibly from multiple lists) will be passed
224 separately. */
225 tree attrs;
226 /* Any type specifier keyword used such as "int", not reflecting
227 modifiers such as "short", or cts_none if none. */
228 enum c_typespec_keyword typespec_word;
229 /* The storage class specifier, or csc_none if none. */
230 enum c_storage_class storage_class;
231 /* Whether any expressions in typeof specifiers may appear in
232 constant expressions. */
233 BOOL_BITFIELD expr_const_operands : 1;
234 /* Whether any declaration specifiers have been seen at all. */
235 BOOL_BITFIELD declspecs_seen_p : 1;
236 /* Whether a type specifier has been seen. */
237 BOOL_BITFIELD type_seen_p : 1;
238 /* Whether something other than a storage class specifier or
239 attribute has been seen. This is used to warn for the
240 obsolescent usage of storage class specifiers other than at the
241 start of the list. (Doing this properly would require function
242 specifiers to be handled separately from storage class
243 specifiers.) */
244 BOOL_BITFIELD non_sc_seen_p : 1;
245 /* Whether the type is specified by a typedef or typeof name. */
246 BOOL_BITFIELD typedef_p : 1;
247 /* Whether a struct, union or enum type either had its content
248 defined by a type specifier in the list or was the first visible
249 declaration of its tag. */
250 BOOL_BITFIELD tag_defined_p : 1;
251 /* Whether the type is explicitly "signed" or specified by a typedef
252 whose type is explicitly "signed". */
253 BOOL_BITFIELD explicit_signed_p : 1;
254 /* Whether the specifiers include a deprecated typedef. */
255 BOOL_BITFIELD deprecated_p : 1;
256 /* Whether the type defaulted to "int" because there were no type
257 specifiers. */
258 BOOL_BITFIELD default_int_p;
259 /* Whether "long" was specified. */
260 BOOL_BITFIELD long_p : 1;
261 /* Whether "long" was specified more than once. */
262 BOOL_BITFIELD long_long_p : 1;
263 /* Whether "short" was specified. */
264 BOOL_BITFIELD short_p : 1;
265 /* Whether "signed" was specified. */
266 BOOL_BITFIELD signed_p : 1;
267 /* Whether "unsigned" was specified. */
268 BOOL_BITFIELD unsigned_p : 1;
269 /* Whether "complex" was specified. */
270 BOOL_BITFIELD complex_p : 1;
271 /* Whether "inline" was specified. */
272 BOOL_BITFIELD inline_p : 1;
273 /* Whether "__thread" was specified. */
274 BOOL_BITFIELD thread_p : 1;
275 /* Whether "const" was specified. */
276 BOOL_BITFIELD const_p : 1;
277 /* Whether "volatile" was specified. */
278 BOOL_BITFIELD volatile_p : 1;
279 /* Whether "restrict" was specified. */
280 BOOL_BITFIELD restrict_p : 1;
281 /* Whether "_Sat" was specified. */
282 BOOL_BITFIELD saturating_p : 1;
283 /* The address space that the declaration belongs to. */
284 addr_space_t address_space;
285 };
286
287 /* The various kinds of declarators in C. */
288 enum c_declarator_kind {
289 /* An identifier. */
290 cdk_id,
291 /* A function. */
292 cdk_function,
293 /* An array. */
294 cdk_array,
295 /* A pointer. */
296 cdk_pointer,
297 /* Parenthesized declarator with nested attributes. */
298 cdk_attrs
299 };
300
301 /* Information about the parameters in a function declarator. */
302 struct c_arg_info {
303 /* A list of parameter decls. */
304 tree parms;
305 /* A list of structure, union and enum tags defined. */
306 tree tags;
307 /* A list of argument types to go in the FUNCTION_TYPE. */
308 tree types;
309 /* A list of non-parameter decls (notably enumeration constants)
310 defined with the parameters. */
311 tree others;
312 /* A list of VLA sizes from the parameters. In a function
313 definition, these are used to ensure that side-effects in sizes
314 of arrays converted to pointers (such as a parameter int i[n++])
315 take place; otherwise, they are ignored. */
316 tree pending_sizes;
317 /* True when these arguments had [*]. */
318 BOOL_BITFIELD had_vla_unspec : 1;
319 };
320
321 /* A declarator. */
322 struct c_declarator {
323 /* The kind of declarator. */
324 enum c_declarator_kind kind;
325 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */
326 struct c_declarator *declarator;
327 location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
328 union {
329 /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
330 declarator. */
331 tree id;
332 /* For functions. */
333 struct c_arg_info *arg_info;
334 /* For arrays. */
335 struct {
336 /* The array dimension, or NULL for [] and [*]. */
337 tree dimen;
338 /* The qualifiers inside []. */
339 int quals;
340 /* The attributes (currently ignored) inside []. */
341 tree attrs;
342 /* Whether [static] was used. */
343 BOOL_BITFIELD static_p : 1;
344 /* Whether [*] was used. */
345 BOOL_BITFIELD vla_unspec_p : 1;
346 } array;
347 /* For pointers, the qualifiers on the pointer type. */
348 int pointer_quals;
349 /* For attributes. */
350 tree attrs;
351 } u;
352 };
353
354 /* A type name. */
355 struct c_type_name {
356 /* The declaration specifiers. */
357 struct c_declspecs *specs;
358 /* The declarator. */
359 struct c_declarator *declarator;
360 };
361
362 /* A parameter. */
363 struct c_parm {
364 /* The declaration specifiers, minus any prefix attributes. */
365 struct c_declspecs *specs;
366 /* The attributes. */
367 tree attrs;
368 /* The declarator. */
369 struct c_declarator *declarator;
370 };
371
372 /* Used when parsing an enum. Initialized by start_enum. */
373 struct c_enum_contents
374 {
375 /* While defining an enum type, this is 1 plus the last enumerator
376 constant value. */
377 tree enum_next_value;
378
379 /* Nonzero means that there was overflow computing enum_next_value. */
380 int enum_overflow;
381 };
382
383 /* A type of reference to a static identifier in an inline
384 function. */
385 enum c_inline_static_type {
386 /* Identifier with internal linkage used in function that may be an
387 inline definition (i.e., file-scope static). */
388 csi_internal,
389 /* Modifiable object with static storage duration defined in
390 function that may be an inline definition (i.e., local
391 static). */
392 csi_modifiable
393 };
394
395
396 /* in c-parser.c */
397 extern void c_parse_init (void);
398
399 /* in c-aux-info.c */
400 extern void gen_aux_info_record (tree, int, int, int);
401
402 /* in c-decl.c */
403 struct c_spot_bindings;
404 struct c_struct_parse_info;
405 extern struct obstack parser_obstack;
406 extern tree c_break_label;
407 extern tree c_cont_label;
408
409 extern int global_bindings_p (void);
410 extern void push_scope (void);
411 extern tree pop_scope (void);
412 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
413 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
414
415 extern void record_inline_static (location_t, tree, tree,
416 enum c_inline_static_type);
417 extern void c_init_decl_processing (void);
418 extern void c_print_identifier (FILE *, tree, int);
419 extern int quals_from_declspecs (const struct c_declspecs *);
420 extern struct c_declarator *build_array_declarator (location_t, tree,
421 struct c_declspecs *,
422 bool, bool);
423 extern tree build_enumerator (location_t, struct c_enum_contents *, tree, tree);
424 extern tree check_for_loop_decls (location_t);
425 extern void mark_forward_parm_decls (void);
426 extern void declare_parm_level (void);
427 extern void undeclared_variable (location_t, tree);
428 extern tree lookup_label_for_goto (location_t, tree);
429 extern tree declare_label (tree);
430 extern tree define_label (location_t, tree);
431 extern struct c_spot_bindings *c_get_switch_bindings (void);
432 extern void c_release_switch_bindings (struct c_spot_bindings *);
433 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
434 location_t, location_t);
435 extern void finish_decl (tree, location_t, tree, tree, tree);
436 extern tree finish_enum (tree, tree, tree);
437 extern void finish_function (void);
438 extern tree finish_struct (location_t, tree, tree, tree,
439 struct c_struct_parse_info *);
440 extern struct c_arg_info *get_parm_info (bool);
441 extern tree grokfield (location_t, struct c_declarator *,
442 struct c_declspecs *, tree, tree *);
443 extern tree groktypename (struct c_type_name *, tree *, bool *);
444 extern tree grokparm (const struct c_parm *);
445
446 #ifndef noCbC
447 extern tree implicitly_declare (location_t, tree, int);
448 #else
449 extern tree implicitly_declare (location_t, tree);
450 #endif
451
452 extern void keep_next_level (void);
453 extern void pending_xref_error (void);
454 extern void c_push_function_context (void);
455 extern void c_pop_function_context (void);
456 extern void push_parm_decl (const struct c_parm *);
457 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
458 struct c_declarator *);
459 extern tree c_builtin_function (tree);
460 extern tree c_builtin_function_ext_scope (tree);
461 extern void shadow_tag (const struct c_declspecs *);
462 extern void shadow_tag_warned (const struct c_declspecs *, int);
463 extern tree start_enum (location_t, struct c_enum_contents *, tree);
464 extern int start_function (struct c_declspecs *, struct c_declarator *, tree);
465 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
466 tree);
467 extern tree start_struct (location_t, enum tree_code, tree,
468 struct c_struct_parse_info **);
469 extern void store_parm_decls (void);
470 extern void store_parm_decls_from (struct c_arg_info *);
471 extern tree xref_tag (enum tree_code, tree);
472 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
473 extern int c_expand_decl (tree);
474 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
475 struct c_declarator *);
476 extern struct c_declarator *build_attrs_declarator (tree,
477 struct c_declarator *);
478 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
479 struct c_declarator *);
480 extern struct c_declarator *build_id_declarator (tree);
481 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
482 struct c_declarator *);
483 extern struct c_declspecs *build_null_declspecs (void);
484 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
485 extern struct c_declspecs *declspecs_add_type (location_t,
486 struct c_declspecs *,
487 struct c_typespec);
488 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
489 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
490 extern struct c_declspecs *declspecs_add_addrspace (struct c_declspecs *,
491 addr_space_t);
492 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
493
494 /* in c-objc-common.c */
495 extern bool c_objc_common_init (void);
496 extern bool c_missing_noreturn_ok_p (tree);
497 extern bool c_warn_unused_global_decl (const_tree);
498 extern void c_initialize_diagnostics (diagnostic_context *);
499 extern bool c_vla_unspec_p (tree x, tree fn);
500
501 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
502 c_build_qualified_type ((TYPE), \
503 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
504 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
505
506 /* in c-typeck.c */
507 extern bool in_late_binary_op;
508 extern int in_alignof;
509 extern int in_sizeof;
510 extern int in_typeof;
511
512 extern struct c_switch *c_switch_stack;
513
514 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
515 extern tree require_complete_type (tree);
516 extern int same_translation_unit_p (const_tree, const_tree);
517 extern int comptypes (tree, tree);
518 extern bool c_vla_type_p (const_tree);
519 extern bool c_mark_addressable (tree);
520 extern void c_incomplete_type_error (const_tree, const_tree);
521 extern tree c_type_promotes_to (tree);
522 extern struct c_expr default_function_array_conversion (location_t,
523 struct c_expr);
524 extern tree composite_type (tree, tree);
525 extern tree build_component_ref (location_t, tree, tree);
526 extern tree build_array_ref (location_t, tree, tree);
527 extern tree build_external_ref (location_t, tree, int, tree *);
528 extern void pop_maybe_used (bool);
529 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
530 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
531 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
532 struct c_expr);
533 extern struct c_expr parser_build_binary_op (location_t,
534 enum tree_code, struct c_expr,
535 struct c_expr);
536 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
537 tree, tree);
538 extern tree build_compound_expr (location_t, tree, tree);
539 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
540 extern tree build_c_cast (location_t, tree, tree);
541 extern void store_init_value (location_t, tree, tree, tree);
542 extern void error_init (const char *);
543 extern void pedwarn_init (location_t, int opt, const char *);
544 extern void maybe_warn_string_init (tree, struct c_expr);
545 extern void start_init (tree, tree, int);
546 extern void finish_init (void);
547 extern void really_start_incremental_init (tree);
548 extern void push_init_level (int);
549 extern struct c_expr pop_init_level (int);
550 extern void set_init_index (tree, tree);
551 extern void set_init_label (tree);
552 extern void process_init_element (struct c_expr, bool);
553 extern tree build_compound_literal (location_t, tree, tree, bool);
554 extern void check_compound_literal_type (location_t, struct c_type_name *);
555 extern tree c_start_case (location_t, location_t, tree);
556 extern void c_finish_case (tree);
557 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
558 extern tree build_asm_stmt (tree, tree);
559 extern int c_types_compatible_p (tree, tree);
560 extern tree c_begin_compound_stmt (bool);
561 extern tree c_end_compound_stmt (location_t, tree, bool);
562 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
563 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
564 extern tree c_begin_stmt_expr (void);
565 extern tree c_finish_stmt_expr (location_t, tree);
566 extern tree c_process_expr_stmt (location_t, tree);
567 extern tree c_finish_expr_stmt (location_t, tree);
568 extern tree c_finish_return (location_t, tree, tree);
569 extern tree c_finish_bc_stmt (location_t, tree *, bool);
570 extern tree c_finish_goto_label (location_t, tree);
571 extern tree c_finish_goto_ptr (location_t, tree);
572 extern tree c_expr_to_decl (tree, bool *, bool *);
573 extern tree c_begin_omp_parallel (void);
574 extern tree c_finish_omp_parallel (location_t, tree, tree);
575 extern tree c_begin_omp_task (void);
576 extern tree c_finish_omp_task (location_t, tree, tree);
577 extern tree c_finish_omp_clauses (tree);
578 extern tree c_build_va_arg (location_t, tree, tree);
579
580 /* Set to 0 at beginning of a function definition, set to 1 if
581 a return statement that specifies a return value is seen. */
582
583 extern int current_function_returns_value;
584
585 /* Set to 0 at beginning of a function definition, set to 1 if
586 a return statement with no argument is seen. */
587
588 extern int current_function_returns_null;
589
590 /* Set to 0 at beginning of a function definition, set to 1 if
591 a call to a noreturn function is seen. */
592
593 extern int current_function_returns_abnormally;
594
595 /* Nonzero means we are reading code that came from a system header file. */
596
597 extern int system_header_p;
598
599 /* True means global_bindings_p should return false even if the scope stack
600 says we are in file scope. */
601
602 extern bool c_override_global_bindings_to_false;
603
604 /* In c-decl.c */
605 extern void c_finish_incomplete_decl (tree);
606 extern void c_write_global_declarations (void);
607
608 /* In order for the format checking to accept the C frontend
609 diagnostic framework extensions, you must include this file before
610 toplev.h, not after. */
611 #if GCC_VERSION >= 4001
612 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
613 #else
614 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
615 #endif
616
617 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
618 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
619
620 extern bool c_cpp_error (cpp_reader *, int, location_t, unsigned int,
621 const char *, va_list *)
622 ATTRIBUTE_GCC_CDIAG(5,0);
623
624 #endif /* ! GCC_C_TREE_H */