c-tree.h revision 169699 
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 Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to the Free
19Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
2002110-1301, USA.  */
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
36struct 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
60struct 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.  */
151struct c_expr
152{
153  /* The value of the expression.  */
154  tree value;
155  /* Record the original 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.  */
165enum 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.  */
188struct 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.  */
196enum 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", or none of these.  */
207enum c_typespec_keyword {
208  cts_none,
209  cts_void,
210  cts_bool,
211  cts_char,
212  cts_int,
213  cts_float,
214  cts_double,
215  cts_dfloat32,
216  cts_dfloat64,
217  cts_dfloat128
218};
219
220/* A sequence of declaration specifiers in C.  */
221struct c_declspecs {
222  /* The type specified, if a single type specifier such as a struct,
223     union or enum specifier, typedef name or typeof specifies the
224     whole type, or NULL_TREE if none or a keyword such as "void" or
225     "char" is used.  Does not include qualifiers.  */
226  tree type;
227  /* The attributes from a typedef decl.  */
228  tree decl_attr;
229  /* When parsing, the attributes.  Outside the parser, this will be
230     NULL; attributes (possibly from multiple lists) will be passed
231     separately.  */
232  tree attrs;
233  /* Any type specifier keyword used such as "int", not reflecting
234     modifiers such as "short", or cts_none if none.  */
235  enum c_typespec_keyword typespec_word;
236  /* The storage class specifier, or csc_none if none.  */
237  enum c_storage_class storage_class;
238  /* Whether any declaration specifiers have been seen at all.  */
239  BOOL_BITFIELD declspecs_seen_p : 1;
240  /* Whether a type specifier has been seen.  */
241  BOOL_BITFIELD type_seen_p : 1;
242  /* Whether something other than a storage class specifier or
243     attribute has been seen.  This is used to warn for the
244     obsolescent usage of storage class specifiers other than at the
245     start of the list.  (Doing this properly would require function
246     specifiers to be handled separately from storage class
247     specifiers.)  */
248  BOOL_BITFIELD non_sc_seen_p : 1;
249  /* Whether the type is specified by a typedef or typeof name.  */
250  BOOL_BITFIELD typedef_p : 1;
251  /* Whether a struct, union or enum type either had its content
252     defined by a type specifier in the list or was the first visible
253     declaration of its tag.  */
254  BOOL_BITFIELD tag_defined_p : 1;
255  /* Whether the type is explicitly "signed" or specified by a typedef
256     whose type is explicitly "signed".  */
257  BOOL_BITFIELD explicit_signed_p : 1;
258  /* Whether the specifiers include a deprecated typedef.  */
259  BOOL_BITFIELD deprecated_p : 1;
260  /* Whether the type defaulted to "int" because there were no type
261     specifiers.  */
262  BOOL_BITFIELD default_int_p;
263  /* Whether "long" was specified.  */
264  BOOL_BITFIELD long_p : 1;
265  /* Whether "long" was specified more than once.  */
266  BOOL_BITFIELD long_long_p : 1;
267  /* Whether "short" was specified.  */
268  BOOL_BITFIELD short_p : 1;
269  /* Whether "signed" was specified.  */
270  BOOL_BITFIELD signed_p : 1;
271  /* Whether "unsigned" was specified.  */
272  BOOL_BITFIELD unsigned_p : 1;
273  /* Whether "complex" was specified.  */
274  BOOL_BITFIELD complex_p : 1;
275  /* Whether "inline" was specified.  */
276  BOOL_BITFIELD inline_p : 1;
277  /* Whether "__thread" was specified.  */
278  BOOL_BITFIELD thread_p : 1;
279  /* Whether "const" was specified.  */
280  BOOL_BITFIELD const_p : 1;
281  /* Whether "volatile" was specified.  */
282  BOOL_BITFIELD volatile_p : 1;
283  /* Whether "restrict" was specified.  */
284  BOOL_BITFIELD restrict_p : 1;
285};
286
287/* The various kinds of declarators in C.  */
288enum 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.  */
302struct 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.  */
322struct 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. */
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.  */
355struct 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.  */
363struct 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/* Save and restore the variables in this file and elsewhere
373   that keep track of the progress of compilation of the current function.
374   Used for nested functions.  */
375
376struct language_function GTY(())
377{
378  struct c_language_function base;
379  tree x_break_label;
380  tree x_cont_label;
381  struct c_switch * GTY((skip)) x_switch_stack;
382  struct c_arg_info * GTY((skip)) arg_info;
383  int returns_value;
384  int returns_null;
385  int returns_abnormally;
386  int warn_about_return_type;
387  int extern_inline;
388};
389
390/* Save lists of labels used or defined in particular contexts.
391   Allocated on the parser obstack.  */
392
393struct c_label_list
394{
395  /* The label at the head of the list.  */
396  tree label;
397  /* The rest of the list.  */
398  struct c_label_list *next;
399};
400
401/* Statement expression context.  */
402
403struct c_label_context_se
404{
405  /* The labels defined at this level of nesting.  */
406  struct c_label_list *labels_def;
407  /* The labels used at this level of nesting.  */
408  struct c_label_list *labels_used;
409  /* The next outermost context.  */
410  struct c_label_context_se *next;
411};
412
413/* Context of variably modified declarations.  */
414
415struct c_label_context_vm
416{
417  /* The labels defined at this level of nesting.  */
418  struct c_label_list *labels_def;
419  /* The labels used at this level of nesting.  */
420  struct c_label_list *labels_used;
421  /* The scope of this context.  Multiple contexts may be at the same
422     numbered scope, since each variably modified declaration starts a
423     new context.  */
424  unsigned scope;
425  /* The next outermost context.  */
426  struct c_label_context_vm *next;
427};
428
429
430/* in c-parser.c */
431extern void c_parse_init (void);
432
433/* in c-aux-info.c */
434extern void gen_aux_info_record (tree, int, int, int);
435
436/* in c-decl.c */
437extern struct obstack parser_obstack;
438extern tree c_break_label;
439extern tree c_cont_label;
440
441extern int global_bindings_p (void);
442extern void push_scope (void);
443extern tree pop_scope (void);
444extern void insert_block (tree);
445extern void c_expand_body (tree);
446
447extern void c_init_decl_processing (void);
448extern void c_dup_lang_specific_decl (tree);
449extern void c_print_identifier (FILE *, tree, int);
450extern int quals_from_declspecs (const struct c_declspecs *);
451extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
452						    bool, bool);
453extern tree build_enumerator (tree, tree);
454extern tree check_for_loop_decls (void);
455extern void mark_forward_parm_decls (void);
456extern void declare_parm_level (void);
457extern void undeclared_variable (tree, location_t);
458extern tree declare_label (tree);
459extern tree define_label (location_t, tree);
460extern void c_maybe_initialize_eh (void);
461extern void finish_decl (tree, tree, tree);
462extern tree finish_enum (tree, tree, tree);
463extern void finish_function (void);
464extern tree finish_struct (tree, tree, tree);
465extern struct c_arg_info *get_parm_info (bool);
466extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
467extern tree groktypename (struct c_type_name *);
468extern tree grokparm (const struct c_parm *);
469extern tree implicitly_declare (tree);
470extern void keep_next_level (void);
471extern void pending_xref_error (void);
472extern void c_push_function_context (struct function *);
473extern void c_pop_function_context (struct function *);
474extern void push_parm_decl (const struct c_parm *);
475extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
476							struct c_declarator *,
477							bool);
478extern tree builtin_function (const char *, tree, int, enum built_in_class,
479			      const char *, tree);
480extern void shadow_tag (const struct c_declspecs *);
481extern void shadow_tag_warned (const struct c_declspecs *, int);
482extern tree start_enum (tree);
483extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
484extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
485			tree);
486extern tree start_struct (enum tree_code, tree);
487extern void store_parm_decls (void);
488extern void store_parm_decls_from (struct c_arg_info *);
489extern tree xref_tag (enum tree_code, tree);
490extern struct c_typespec parser_xref_tag (enum tree_code, tree);
491extern int c_expand_decl (tree);
492extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
493				    struct c_declarator *);
494extern struct c_declarator *build_attrs_declarator (tree,
495						    struct c_declarator *);
496extern struct c_declarator *build_function_declarator (struct c_arg_info *,
497						       struct c_declarator *);
498extern struct c_declarator *build_id_declarator (tree);
499extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
500						     struct c_declarator *);
501extern struct c_declspecs *build_null_declspecs (void);
502extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
503extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
504					       struct c_typespec);
505extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
506extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
507extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
508
509/* in c-objc-common.c */
510extern int c_disregard_inline_limits (tree);
511extern int c_cannot_inline_tree_fn (tree *);
512extern bool c_objc_common_init (void);
513extern bool c_missing_noreturn_ok_p (tree);
514extern tree c_objc_common_truthvalue_conversion (tree expr);
515extern bool c_warn_unused_global_decl (tree);
516extern void c_initialize_diagnostics (diagnostic_context *);
517extern bool c_vla_unspec_p (tree x, tree fn);
518
519#define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)		  \
520  c_build_qualified_type ((TYPE),				  \
521			  ((CONST_P) ? TYPE_QUAL_CONST : 0) |	  \
522			  ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
523
524/* in c-typeck.c */
525extern int in_alignof;
526extern int in_sizeof;
527extern int in_typeof;
528
529extern struct c_switch *c_switch_stack;
530extern struct c_label_context_se *label_context_stack_se;
531extern struct c_label_context_vm *label_context_stack_vm;
532
533extern tree require_complete_type (tree);
534extern int same_translation_unit_p (tree, tree);
535extern int comptypes (tree, tree);
536extern bool c_vla_type_p (tree);
537extern bool c_mark_addressable (tree);
538extern void c_incomplete_type_error (tree, tree);
539extern tree c_type_promotes_to (tree);
540extern struct c_expr default_function_array_conversion (struct c_expr);
541extern tree composite_type (tree, tree);
542extern tree build_component_ref (tree, tree);
543extern tree build_array_ref (tree, tree);
544extern tree build_external_ref (tree, int, location_t);
545extern void pop_maybe_used (bool);
546extern struct c_expr c_expr_sizeof_expr (struct c_expr);
547extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
548extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr);
549extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
550					     struct c_expr);
551extern tree build_conditional_expr (tree, tree, tree);
552extern tree build_compound_expr (tree, tree);
553extern tree c_cast_expr (struct c_type_name *, tree);
554extern tree build_c_cast (tree, tree);
555extern void store_init_value (tree, tree);
556extern void error_init (const char *);
557extern void pedwarn_init (const char *);
558extern void maybe_warn_string_init (tree, struct c_expr);
559extern void start_init (tree, tree, int);
560extern void finish_init (void);
561extern void really_start_incremental_init (tree);
562extern void push_init_level (int);
563extern struct c_expr pop_init_level (int);
564extern void set_init_index (tree, tree);
565extern void set_init_label (tree);
566extern void process_init_element (struct c_expr);
567extern tree build_compound_literal (tree, tree);
568extern tree c_start_case (tree);
569extern void c_finish_case (tree);
570extern tree build_asm_expr (tree, tree, tree, tree, bool);
571extern tree build_asm_stmt (tree, tree);
572extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
573extern int c_types_compatible_p (tree, tree);
574extern tree c_begin_compound_stmt (bool);
575extern tree c_end_compound_stmt (tree, bool);
576extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
577extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
578extern tree c_begin_stmt_expr (void);
579extern tree c_finish_stmt_expr (tree);
580extern tree c_process_expr_stmt (tree);
581extern tree c_finish_expr_stmt (tree);
582extern tree c_finish_return (tree);
583extern tree c_finish_bc_stmt (tree *, bool);
584extern tree c_finish_goto_label (tree);
585extern tree c_finish_goto_ptr (tree);
586extern void c_begin_vm_scope (unsigned int);
587extern void c_end_vm_scope (unsigned int);
588extern tree c_expr_to_decl (tree, bool *, bool *, bool *);
589extern tree c_begin_omp_parallel (void);
590extern tree c_finish_omp_parallel (tree, tree);
591extern tree c_finish_omp_clauses (tree);
592
593/* Set to 0 at beginning of a function definition, set to 1 if
594   a return statement that specifies a return value is seen.  */
595
596extern int current_function_returns_value;
597
598/* Set to 0 at beginning of a function definition, set to 1 if
599   a return statement with no argument is seen.  */
600
601extern int current_function_returns_null;
602
603/* Set to 0 at beginning of a function definition, set to 1 if
604   a call to a noreturn function is seen.  */
605
606extern int current_function_returns_abnormally;
607
608/* Nonzero means we are reading code that came from a system header file.  */
609
610extern int system_header_p;
611
612/* True means global_bindings_p should return false even if the scope stack
613   says we are in file scope.  */
614
615extern bool c_override_global_bindings_to_false;
616
617/* True means we've initialized exception handling.  */
618extern bool c_eh_initialized_p;
619
620/* In c-decl.c */
621extern void c_finish_incomplete_decl (tree);
622extern void c_write_global_declarations (void);
623
624/* In order for the format checking to accept the C frontend
625   diagnostic framework extensions, you must include this file before
626   toplev.h, not after.  */
627#if GCC_VERSION >= 4001
628#define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
629#else
630#define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
631#endif
632
633extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
634extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
635
636#endif /* ! GCC_C_TREE_H */
637