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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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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 /* Language-specific declaration information. */
35
36 struct lang_decl GTY(())
37 {
38 char dummy;
39 };
40
41 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
42 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
43
44 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
45 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
46
47 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
48 nonzero if the definition of the type has already started. */
49 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
50
51 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
52 declarations whose type would be completed by completing that type. */
53 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
54
55 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
56 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
57 and C_RID_YYCODE is the token number wanted by Yacc. */
58 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
59
60 struct lang_type GTY(())
61 {
62 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
63 struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
64 /* In an ENUMERAL_TYPE, the min and max values. */
65 tree enum_min;
66 tree enum_max;
67 /* In a RECORD_TYPE, information specific to Objective-C, such
68 as a list of adopted protocols or a pointer to a corresponding
69 @interface. See objc/objc-act.h for details. */
70 tree objc_info;
71 };
72
73 /* Record whether a type or decl was written with nonconstant size.
74 Note that TYPE_SIZE may have simplified to a constant. */
75 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
76 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
77
78 /* Record whether a typedef for type `int' was actually `signed int'. */
79 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
80
81 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
82 return type. */
83 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
84
85 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
86 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
87
88 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
89 been declared. */
90 #define C_DECL_DECLARED_BUILTIN(EXP) \
91 DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
92
93 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
94 built-in prototype and does not have a non-built-in prototype. */
95 #define C_DECL_BUILTIN_PROTOTYPE(EXP) \
96 DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
97
98 /* Record whether a decl was declared register. This is strictly a
99 front-end flag, whereas DECL_REGISTER is used for code generation;
100 they may differ for structures with volatile fields. */
101 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
102
103 /* Record whether a decl was used in an expression anywhere except an
104 unevaluated operand of sizeof / typeof / alignof. This is only
105 used for functions declared static but not defined, though outside
106 sizeof and typeof it is set for other function decls as well. */
107 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
108
109 /* Record whether a label was defined in a statement expression which
110 has finished and so can no longer be jumped to. */
111 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP) \
112 DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
113
114 /* Record whether a label was the subject of a goto from outside the
115 current level of statement expression nesting and so cannot be
116 defined right now. */
117 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP) \
118 DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
119
120 /* Record whether a label was defined in the scope of an identifier
121 with variably modified type which has finished and so can no longer
122 be jumped to. */
123 #define C_DECL_UNJUMPABLE_VM(EXP) \
124 DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP))
125
126 /* Record whether a label was the subject of a goto from outside the
127 current level of scopes of identifiers with variably modified type
128 and so cannot be defined right now. */
129 #define C_DECL_UNDEFINABLE_VM(EXP) \
130 DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP))
131
132 /* Record whether a variable has been declared threadprivate by
133 #pragma omp threadprivate. */
134 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
135
136 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
137 N.B. Could be simplified if all built-in decls had complete prototypes
138 (but this is presently difficult because some of them need FILE*). */
139 #define C_DECL_ISNT_PROTOTYPE(EXP) \
140 (EXP == 0 \
141 || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0 \
142 && !DECL_BUILT_IN (EXP)))
143
144 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
145 TYPE_ARG_TYPES for functions with prototypes, but created for functions
146 without prototypes. */
147 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
148
149 /* Record parser information about an expression that is irrelevant
150 for code generation alongside a tree representing its value. */
151 struct c_expr
152 {
153 /* The value of the expression. */
154 tree value;
155 /* Record the original unary/binary operator of an expression, which may
156 have been changed by fold, STRING_CST for unparenthesized string
157 constants, or ERROR_MARK for other expressions (including
158 parenthesized expressions). */
159 enum tree_code original_code;
160 };
161
162 /* A kind of type specifier. Note that this information is currently
163 only used to distinguish tag definitions, tag references and typeof
164 uses. */
165 enum c_typespec_kind {
166 /* A reserved keyword type specifier. */
167 ctsk_resword,
168 /* A reference to a tag, previously declared, such as "struct foo".
169 This includes where the previous declaration was as a different
170 kind of tag, in which case this is only valid if shadowing that
171 tag in an inner scope. */
172 ctsk_tagref,
173 /* A reference to a tag, not previously declared in a visible
174 scope. */
175 ctsk_tagfirstref,
176 /* A definition of a tag such as "struct foo { int a; }". */
177 ctsk_tagdef,
178 /* A typedef name. */
179 ctsk_typedef,
180 /* An ObjC-specific kind of type specifier. */
181 ctsk_objc,
182 /* A typeof specifier. */
183 ctsk_typeof
184 };
185
186 /* A type specifier: this structure is created in the parser and
187 passed to declspecs_add_type only. */
188 struct c_typespec {
189 /* What kind of type specifier this is. */
190 enum c_typespec_kind kind;
191 /* The specifier itself. */
192 tree spec;
193 };
194
195 /* A storage class specifier. */
196 enum c_storage_class {
197 csc_none,
198 csc_auto,
199 csc_extern,
200 csc_register,
201 csc_static,
202 csc_typedef
203 };
204
205 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
206 "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
207 or none of these. */
208 enum c_typespec_keyword {
209 cts_none,
210 cts_void,
211 cts_bool,
212 cts_char,
213 cts_int,
214 cts_float,
215 cts_double,
216 cts_dfloat32,
217 cts_dfloat64,
218 cts_dfloat128,
219 cts_fract,
220 cts_accum
221 };
222
223 /* A sequence of declaration specifiers in C. */
224 struct c_declspecs {
225 /* The type specified, if a single type specifier such as a struct,
226 union or enum specifier, typedef name or typeof specifies the
227 whole type, or NULL_TREE if none or a keyword such as "void" or
228 "char" is used. Does not include qualifiers. */
229 tree type;
230 /* The attributes from a typedef decl. */
231 tree decl_attr;
232 /* When parsing, the attributes. Outside the parser, this will be
233 NULL; attributes (possibly from multiple lists) will be passed
234 separately. */
235 tree attrs;
236 /* Any type specifier keyword used such as "int", not reflecting
237 modifiers such as "short", or cts_none if none. */
238 enum c_typespec_keyword typespec_word;
239 /* The storage class specifier, or csc_none if none. */
240 enum c_storage_class storage_class;
241 /* Whether any declaration specifiers have been seen at all. */
242 BOOL_BITFIELD declspecs_seen_p : 1;
243 /* Whether a type specifier has been seen. */
244 BOOL_BITFIELD type_seen_p : 1;
245 /* Whether something other than a storage class specifier or
246 attribute has been seen. This is used to warn for the
247 obsolescent usage of storage class specifiers other than at the
248 start of the list. (Doing this properly would require function
249 specifiers to be handled separately from storage class
250 specifiers.) */
251 BOOL_BITFIELD non_sc_seen_p : 1;
252 /* Whether the type is specified by a typedef or typeof name. */
253 BOOL_BITFIELD typedef_p : 1;
254 /* Whether a struct, union or enum type either had its content
255 defined by a type specifier in the list or was the first visible
256 declaration of its tag. */
257 BOOL_BITFIELD tag_defined_p : 1;
258 /* Whether the type is explicitly "signed" or specified by a typedef
259 whose type is explicitly "signed". */
260 BOOL_BITFIELD explicit_signed_p : 1;
261 /* Whether the specifiers include a deprecated typedef. */
262 BOOL_BITFIELD deprecated_p : 1;
263 /* Whether the type defaulted to "int" because there were no type
264 specifiers. */
265 BOOL_BITFIELD default_int_p;
266 /* Whether "long" was specified. */
267 BOOL_BITFIELD long_p : 1;
268 /* Whether "long" was specified more than once. */
269 BOOL_BITFIELD long_long_p : 1;
270 /* Whether "short" was specified. */
271 BOOL_BITFIELD short_p : 1;
272 /* Whether "signed" was specified. */
273 BOOL_BITFIELD signed_p : 1;
274 /* Whether "unsigned" was specified. */
275 BOOL_BITFIELD unsigned_p : 1;
276 /* Whether "complex" was specified. */
277 BOOL_BITFIELD complex_p : 1;
278 /* Whether "inline" was specified. */
279 BOOL_BITFIELD inline_p : 1;
280 /* Whether "__thread" was specified. */
281 BOOL_BITFIELD thread_p : 1;
282 /* Whether "const" was specified. */
283 BOOL_BITFIELD const_p : 1;
284 /* Whether "volatile" was specified. */
285 BOOL_BITFIELD volatile_p : 1;
286 /* Whether "restrict" was specified. */
287 BOOL_BITFIELD restrict_p : 1;
288 /* Whether "_Sat" was specified. */
289 BOOL_BITFIELD saturating_p : 1;
290 };
291
292 /* The various kinds of declarators in C. */
293 enum c_declarator_kind {
294 /* An identifier. */
295 cdk_id,
296 /* A function. */
297 cdk_function,
298 /* An array. */
299 cdk_array,
300 /* A pointer. */
301 cdk_pointer,
302 /* Parenthesized declarator with nested attributes. */
303 cdk_attrs
304 };
305
306 /* Information about the parameters in a function declarator. */
307 struct c_arg_info {
308 /* A list of parameter decls. */
309 tree parms;
310 /* A list of structure, union and enum tags defined. */
311 tree tags;
312 /* A list of argument types to go in the FUNCTION_TYPE. */
313 tree types;
314 /* A list of non-parameter decls (notably enumeration constants)
315 defined with the parameters. */
316 tree others;
317 /* A list of VLA sizes from the parameters. In a function
318 definition, these are used to ensure that side-effects in sizes
319 of arrays converted to pointers (such as a parameter int i[n++])
320 take place; otherwise, they are ignored. */
321 tree pending_sizes;
322 /* True when these arguments had [*]. */
323 BOOL_BITFIELD had_vla_unspec : 1;
324 };
325
326 /* A declarator. */
327 struct c_declarator {
328 /* The kind of declarator. */
329 enum c_declarator_kind kind;
330 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */
331 struct c_declarator *declarator;
332 location_t id_loc; /* Currently only set for cdk_id. */
333 union {
334 /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
335 declarator. */
336 tree id;
337 /* For functions. */
338 struct c_arg_info *arg_info;
339 /* For arrays. */
340 struct {
341 /* The array dimension, or NULL for [] and [*]. */
342 tree dimen;
343 /* The qualifiers inside []. */
344 int quals;
345 /* The attributes (currently ignored) inside []. */
346 tree attrs;
347 /* Whether [static] was used. */
348 BOOL_BITFIELD static_p : 1;
349 /* Whether [*] was used. */
350 BOOL_BITFIELD vla_unspec_p : 1;
351 } array;
352 /* For pointers, the qualifiers on the pointer type. */
353 int pointer_quals;
354 /* For attributes. */
355 tree attrs;
356 } u;
357 };
358
359 /* A type name. */
360 struct c_type_name {
361 /* The declaration specifiers. */
362 struct c_declspecs *specs;
363 /* The declarator. */
364 struct c_declarator *declarator;
365 };
366
367 /* A parameter. */
368 struct c_parm {
369 /* The declaration specifiers, minus any prefix attributes. */
370 struct c_declspecs *specs;
371 /* The attributes. */
372 tree attrs;
373 /* The declarator. */
374 struct c_declarator *declarator;
375 };
376
377 /* Save and restore the variables in this file and elsewhere
378 that keep track of the progress of compilation of the current function.
379 Used for nested functions. */
380
381 struct language_function GTY(())
382 {
383 struct c_language_function base;
384 tree x_break_label;
385 tree x_cont_label;
386 struct c_switch * GTY((skip)) x_switch_stack;
387 struct c_arg_info * GTY((skip)) arg_info;
388 int returns_value;
389 int returns_null;
390 int returns_abnormally;
391 int warn_about_return_type;
392 };
393
394 /* Save lists of labels used or defined in particular contexts.
395 Allocated on the parser obstack. */
396
397 struct c_label_list
398 {
399 /* The label at the head of the list. */
400 tree label;
401 /* The rest of the list. */
402 struct c_label_list *next;
403 };
404
405 /* Statement expression context. */
406
407 struct c_label_context_se
408 {
409 /* The labels defined at this level of nesting. */
410 struct c_label_list *labels_def;
411 /* The labels used at this level of nesting. */
412 struct c_label_list *labels_used;
413 /* The next outermost context. */
414 struct c_label_context_se *next;
415 };
416
417 /* Context of variably modified declarations. */
418
419 struct c_label_context_vm
420 {
421 /* The labels defined at this level of nesting. */
422 struct c_label_list *labels_def;
423 /* The labels used at this level of nesting. */
424 struct c_label_list *labels_used;
425 /* The scope of this context. Multiple contexts may be at the same
426 numbered scope, since each variably modified declaration starts a
427 new context. */
428 unsigned scope;
429 /* The next outermost context. */
430 struct c_label_context_vm *next;
431 };
432
433 /* Used when parsing an enum. Initialized by start_enum. */
434 struct c_enum_contents
435 {
436 /* While defining an enum type, this is 1 plus the last enumerator
437 constant value. */
438 tree enum_next_value;
439
440 /* Nonzero means that there was overflow computing enum_next_value. */
441 int enum_overflow;
442 };
443
444
445 /* in c-parser.c */
446 extern void c_parse_init (void);
447
448 /* in c-aux-info.c */
449 extern void gen_aux_info_record (tree, int, int, int);
450
451 /* in c-decl.c */
452 extern struct obstack parser_obstack;
453 extern tree c_break_label;
454 extern tree c_cont_label;
455
456 extern int global_bindings_p (void);
457 extern void push_scope (void);
458 extern tree pop_scope (void);
459
460 extern void c_init_decl_processing (void);
461 extern void c_dup_lang_specific_decl (tree);
462 extern void c_print_identifier (FILE *, tree, int);
463 extern int quals_from_declspecs (const struct c_declspecs *);
464 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
465 bool, bool);
466 extern tree build_enumerator (struct c_enum_contents *, tree, tree, location_t);
467 extern tree check_for_loop_decls (void);
468 extern void mark_forward_parm_decls (void);
469 extern void declare_parm_level (void);
470 extern void undeclared_variable (tree, location_t);
471 extern tree declare_label (tree);
472 extern tree define_label (location_t, tree);
473 extern void c_maybe_initialize_eh (void);
474 extern void finish_decl (tree, tree, tree);
475 extern tree finish_enum (tree, tree, tree);
476 extern void finish_function (void);
477 extern tree finish_struct (tree, tree, tree);
478 extern struct c_arg_info *get_parm_info (bool);
479 extern tree grokfield (location_t, struct c_declarator *,
480 struct c_declspecs *, tree, tree *);
481 extern tree groktypename (struct c_type_name *);
482 extern tree grokparm (const struct c_parm *);
483 extern tree implicitly_declare (tree);
484 extern void keep_next_level (void);
485 extern void pending_xref_error (void);
486 extern void c_push_function_context (void);
487 extern void c_pop_function_context (void);
488 extern void push_parm_decl (const struct c_parm *);
489 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
490 struct c_declarator *);
491 extern tree c_builtin_function (tree);
492 extern tree c_builtin_function_ext_scope (tree);
493 extern void shadow_tag (const struct c_declspecs *);
494 extern void shadow_tag_warned (const struct c_declspecs *, int);
495 extern tree start_enum (struct c_enum_contents *, tree);
496 extern int start_function (struct c_declspecs *, struct c_declarator *, tree);
497 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
498 tree);
499 extern tree start_struct (enum tree_code, tree);
500 extern void store_parm_decls (void);
501 extern void store_parm_decls_from (struct c_arg_info *);
502 extern tree xref_tag (enum tree_code, tree);
503 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
504 extern int c_expand_decl (tree);
505 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
506 struct c_declarator *);
507 extern struct c_declarator *build_attrs_declarator (tree,
508 struct c_declarator *);
509 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
510 struct c_declarator *);
511 extern struct c_declarator *build_id_declarator (tree);
512 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
513 struct c_declarator *);
514 extern struct c_declspecs *build_null_declspecs (void);
515 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
516 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
517 struct c_typespec);
518 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
519 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
520 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
521
522 /* in c-objc-common.c */
523 extern bool c_objc_common_init (void);
524 extern bool c_missing_noreturn_ok_p (tree);
525 extern bool c_warn_unused_global_decl (const_tree);
526 extern void c_initialize_diagnostics (diagnostic_context *);
527 extern bool c_vla_unspec_p (tree x, tree fn);
528
529 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
530 c_build_qualified_type ((TYPE), \
531 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
532 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
533
534 /* in c-typeck.c */
535 extern int in_alignof;
536 extern int in_sizeof;
537 extern int in_typeof;
538
539 extern struct c_switch *c_switch_stack;
540 extern struct c_label_context_se *label_context_stack_se;
541 extern struct c_label_context_vm *label_context_stack_vm;
542
543 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
544 extern tree require_complete_type (tree);
545 extern int same_translation_unit_p (const_tree, const_tree);
546 extern int comptypes (tree, tree);
547 extern bool c_vla_type_p (const_tree);
548 extern bool c_mark_addressable (tree);
549 extern void c_incomplete_type_error (const_tree, const_tree);
550 extern tree c_type_promotes_to (tree);
551 extern struct c_expr default_function_array_conversion (struct c_expr);
552 extern tree composite_type (tree, tree);
553 extern tree build_component_ref (tree, tree);
554 extern tree build_array_ref (tree, tree, location_t);
555 extern tree build_external_ref (tree, int, location_t);
556 extern void pop_maybe_used (bool);
557 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
558 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
559 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr,
560 location_t);
561 extern struct c_expr parser_build_binary_op (location_t,
562 enum tree_code, struct c_expr,
563 struct c_expr);
564 extern tree build_conditional_expr (tree, tree, tree);
565 extern tree build_compound_expr (tree, tree);
566 extern tree c_cast_expr (struct c_type_name *, tree);
567 extern tree build_c_cast (tree, tree);
568 extern void store_init_value (tree, tree);
569 extern void error_init (const char *);
570 extern void pedwarn_init (location_t, int opt, const char *);
571 extern void maybe_warn_string_init (tree, struct c_expr);
572 extern void start_init (tree, tree, int);
573 extern void finish_init (void);
574 extern void really_start_incremental_init (tree);
575 extern void push_init_level (int);
576 extern struct c_expr pop_init_level (int);
577 extern void set_init_index (tree, tree);
578 extern void set_init_label (tree);
579 extern void process_init_element (struct c_expr, bool);
580 extern tree build_compound_literal (tree, tree);
581 extern tree c_start_case (tree);
582 extern void c_finish_case (tree);
583 extern tree build_asm_expr (tree, tree, tree, tree, bool);
584 extern tree build_asm_stmt (tree, tree);
585 extern int c_types_compatible_p (tree, tree);
586 extern tree c_begin_compound_stmt (bool);
587 extern tree c_end_compound_stmt (tree, bool);
588 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
589 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
590 extern tree c_begin_stmt_expr (void);
591 extern tree c_finish_stmt_expr (tree);
592 extern tree c_process_expr_stmt (tree);
593 extern tree c_finish_expr_stmt (tree);
594 extern tree c_finish_return (tree);
595 extern tree c_finish_bc_stmt (tree *, bool);
596 extern tree c_finish_goto_label (tree);
597 extern tree c_finish_goto_ptr (tree);
598 extern void c_begin_vm_scope (unsigned int);
599 extern void c_end_vm_scope (unsigned int);
600 extern tree c_expr_to_decl (tree, bool *, bool *);
601 extern tree c_begin_omp_parallel (void);
602 extern tree c_finish_omp_parallel (tree, tree);
603 extern tree c_begin_omp_task (void);
604 extern tree c_finish_omp_task (tree, tree);
605 extern tree c_finish_omp_clauses (tree);
606
607 /* Set to 0 at beginning of a function definition, set to 1 if
608 a return statement that specifies a return value is seen. */
609
610 extern int current_function_returns_value;
611
612 /* Set to 0 at beginning of a function definition, set to 1 if
613 a return statement with no argument is seen. */
614
615 extern int current_function_returns_null;
616
617 /* Set to 0 at beginning of a function definition, set to 1 if
618 a call to a noreturn function is seen. */
619
620 extern int current_function_returns_abnormally;
621
622 /* Nonzero means we are reading code that came from a system header file. */
623
624 extern int system_header_p;
625
626 /* True means global_bindings_p should return false even if the scope stack
627 says we are in file scope. */
628
629 extern bool c_override_global_bindings_to_false;
630
631 /* True means we've initialized exception handling. */
632 extern bool c_eh_initialized_p;
633
634 /* In c-decl.c */
635 extern void c_finish_incomplete_decl (tree);
636 extern void c_write_global_declarations (void);
637
638 /* In order for the format checking to accept the C frontend
639 diagnostic framework extensions, you must include this file before
640 toplev.h, not after. */
641 #if GCC_VERSION >= 4001
642 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
643 #else
644 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
645 #endif
646
647 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
648 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
649
650 #endif /* ! GCC_C_TREE_H */