c-tree.h revision 260919 
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  /* APPLE LOCAL begin "unavailable" attribute (radar 2809697) */
261  /* Whether the specifiers include a unavailable typedef.  */
262  BOOL_BITFIELD unavailable_p : 1;
263  /* APPLE LOCAL end "unavailable" attribute (radar 2809697) */
264  /* Whether the type defaulted to "int" because there were no type
265     specifiers.  */
266  BOOL_BITFIELD default_int_p;
267  /* Whether "long" was specified.  */
268  BOOL_BITFIELD long_p : 1;
269  /* Whether "long" was specified more than once.  */
270  BOOL_BITFIELD long_long_p : 1;
271  /* Whether "short" was specified.  */
272  BOOL_BITFIELD short_p : 1;
273  /* Whether "signed" was specified.  */
274  BOOL_BITFIELD signed_p : 1;
275  /* Whether "unsigned" was specified.  */
276  BOOL_BITFIELD unsigned_p : 1;
277  /* Whether "complex" was specified.  */
278  BOOL_BITFIELD complex_p : 1;
279  /* Whether "inline" was specified.  */
280  BOOL_BITFIELD inline_p : 1;
281  /* Whether "__thread" was specified.  */
282  BOOL_BITFIELD thread_p : 1;
283  /* Whether "const" was specified.  */
284  BOOL_BITFIELD const_p : 1;
285  /* Whether "volatile" was specified.  */
286  BOOL_BITFIELD volatile_p : 1;
287  /* Whether "restrict" was specified.  */
288  BOOL_BITFIELD restrict_p : 1;
289};
290
291/* The various kinds of declarators in C.  */
292enum c_declarator_kind {
293  /* An identifier.  */
294  cdk_id,
295  /* A function.  */
296  cdk_function,
297  /* An array.  */
298  cdk_array,
299  /* A pointer.  */
300  cdk_pointer,
301  /* Parenthesized declarator with nested attributes.  */
302  cdk_attrs
303};
304
305/* Information about the parameters in a function declarator.  */
306struct c_arg_info {
307  /* A list of parameter decls.  */
308  tree parms;
309  /* A list of structure, union and enum tags defined.  */
310  tree tags;
311  /* A list of argument types to go in the FUNCTION_TYPE.  */
312  tree types;
313  /* A list of non-parameter decls (notably enumeration constants)
314     defined with the parameters.  */
315  tree others;
316  /* A list of VLA sizes from the parameters.  In a function
317     definition, these are used to ensure that side-effects in sizes
318     of arrays converted to pointers (such as a parameter int i[n++])
319     take place; otherwise, they are ignored.  */
320  tree pending_sizes;
321  /* True when these arguments had [*].  */
322  BOOL_BITFIELD had_vla_unspec : 1;
323};
324
325/* A declarator.  */
326struct c_declarator {
327  /* The kind of declarator.  */
328  enum c_declarator_kind kind;
329  /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
330  struct c_declarator *declarator;
331  location_t id_loc; /* Currently only set for cdk_id. */
332  union {
333    /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
334       declarator.  */
335    tree id;
336    /* For functions.  */
337    struct c_arg_info *arg_info;
338    /* For arrays.  */
339    struct {
340      /* The array dimension, or NULL for [] and [*].  */
341      tree dimen;
342      /* The qualifiers inside [].  */
343      int quals;
344      /* The attributes (currently ignored) inside [].  */
345      tree attrs;
346      /* Whether [static] was used.  */
347      BOOL_BITFIELD static_p : 1;
348      /* Whether [*] was used.  */
349      BOOL_BITFIELD vla_unspec_p : 1;
350    } array;
351    /* For pointers, the qualifiers on the pointer type.  */
352    int pointer_quals;
353    /* For attributes.  */
354    tree attrs;
355  } u;
356};
357
358/* A type name.  */
359struct c_type_name {
360  /* The declaration specifiers.  */
361  struct c_declspecs *specs;
362  /* The declarator.  */
363  struct c_declarator *declarator;
364};
365
366/* A parameter.  */
367struct c_parm {
368  /* The declaration specifiers, minus any prefix attributes.  */
369  struct c_declspecs *specs;
370  /* The attributes.  */
371  tree attrs;
372  /* The declarator.  */
373  struct c_declarator *declarator;
374};
375
376/* Save and restore the variables in this file and elsewhere
377   that keep track of the progress of compilation of the current function.
378   Used for nested functions.  */
379
380struct language_function GTY(())
381{
382  struct c_language_function base;
383  tree x_break_label;
384  tree x_cont_label;
385  struct c_switch * GTY((skip)) x_switch_stack;
386  struct c_arg_info * GTY((skip)) arg_info;
387  int returns_value;
388  int returns_null;
389  int returns_abnormally;
390  int warn_about_return_type;
391};
392
393/* Save lists of labels used or defined in particular contexts.
394   Allocated on the parser obstack.  */
395
396struct c_label_list
397{
398  /* The label at the head of the list.  */
399  tree label;
400  /* The rest of the list.  */
401  struct c_label_list *next;
402};
403
404/* Statement expression context.  */
405
406struct c_label_context_se
407{
408  /* The labels defined at this level of nesting.  */
409  struct c_label_list *labels_def;
410  /* The labels used at this level of nesting.  */
411  struct c_label_list *labels_used;
412  /* The next outermost context.  */
413  struct c_label_context_se *next;
414};
415
416/* Context of variably modified declarations.  */
417
418struct c_label_context_vm
419{
420  /* The labels defined at this level of nesting.  */
421  struct c_label_list *labels_def;
422  /* The labels used at this level of nesting.  */
423  struct c_label_list *labels_used;
424  /* The scope of this context.  Multiple contexts may be at the same
425     numbered scope, since each variably modified declaration starts a
426     new context.  */
427  unsigned scope;
428  /* The next outermost context.  */
429  struct c_label_context_vm *next;
430};
431
432
433/* in c-parser.c */
434extern void c_parse_init (void);
435
436/* in c-aux-info.c */
437extern void gen_aux_info_record (tree, int, int, int);
438
439/* in c-decl.c */
440extern struct obstack parser_obstack;
441extern tree c_break_label;
442extern tree c_cont_label;
443
444extern int global_bindings_p (void);
445extern void push_scope (void);
446extern tree pop_scope (void);
447extern void insert_block (tree);
448extern void c_expand_body (tree);
449
450extern void c_init_decl_processing (void);
451extern void c_dup_lang_specific_decl (tree);
452extern void c_print_identifier (FILE *, tree, int);
453extern int quals_from_declspecs (const struct c_declspecs *);
454extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
455						    bool, bool);
456extern tree build_enumerator (tree, tree);
457extern tree check_for_loop_decls (void);
458extern void mark_forward_parm_decls (void);
459extern void declare_parm_level (void);
460extern void undeclared_variable (tree, location_t);
461extern tree declare_label (tree);
462extern tree define_label (location_t, tree);
463extern void c_maybe_initialize_eh (void);
464extern void finish_decl (tree, tree, tree);
465extern tree finish_enum (tree, tree, tree);
466extern void finish_function (void);
467extern tree finish_struct (tree, tree, tree);
468extern struct c_arg_info *get_parm_info (bool);
469extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
470extern tree groktypename (struct c_type_name *);
471extern tree grokparm (const struct c_parm *);
472extern tree implicitly_declare (tree);
473extern void keep_next_level (void);
474extern void pending_xref_error (void);
475extern void c_push_function_context (struct function *);
476extern void c_pop_function_context (struct function *);
477extern void push_parm_decl (const struct c_parm *);
478extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
479							struct c_declarator *,
480							bool);
481extern tree builtin_function (const char *, tree, int, enum built_in_class,
482			      const char *, tree);
483extern void shadow_tag (const struct c_declspecs *);
484extern void shadow_tag_warned (const struct c_declspecs *, int);
485extern tree start_enum (tree);
486extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
487extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
488			tree);
489extern tree start_struct (enum tree_code, tree);
490extern void store_parm_decls (void);
491extern void store_parm_decls_from (struct c_arg_info *);
492extern tree xref_tag (enum tree_code, tree);
493extern struct c_typespec parser_xref_tag (enum tree_code, tree);
494extern int c_expand_decl (tree);
495extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
496				    struct c_declarator *);
497extern struct c_declarator *build_attrs_declarator (tree,
498						    struct c_declarator *);
499extern struct c_declarator *build_function_declarator (struct c_arg_info *,
500						       struct c_declarator *);
501extern struct c_declarator *build_id_declarator (tree);
502extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
503						     struct c_declarator *);
504extern struct c_declspecs *build_null_declspecs (void);
505extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
506extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
507					       struct c_typespec);
508extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
509extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
510extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
511
512/* in c-objc-common.c */
513extern int c_disregard_inline_limits (tree);
514extern int c_cannot_inline_tree_fn (tree *);
515extern bool c_objc_common_init (void);
516extern bool c_missing_noreturn_ok_p (tree);
517extern tree c_objc_common_truthvalue_conversion (tree expr);
518extern bool c_warn_unused_global_decl (tree);
519extern void c_initialize_diagnostics (diagnostic_context *);
520extern bool c_vla_unspec_p (tree x, tree fn);
521
522#define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)		  \
523  c_build_qualified_type ((TYPE),				  \
524			  ((CONST_P) ? TYPE_QUAL_CONST : 0) |	  \
525			  ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
526
527/* in c-typeck.c */
528extern int in_alignof;
529extern int in_sizeof;
530extern int in_typeof;
531
532extern struct c_switch *c_switch_stack;
533extern struct c_label_context_se *label_context_stack_se;
534extern struct c_label_context_vm *label_context_stack_vm;
535
536extern tree require_complete_type (tree);
537extern int same_translation_unit_p (tree, tree);
538extern int comptypes (tree, tree);
539extern bool c_vla_type_p (tree);
540extern bool c_mark_addressable (tree);
541extern void c_incomplete_type_error (tree, tree);
542extern tree c_type_promotes_to (tree);
543extern struct c_expr default_function_array_conversion (struct c_expr);
544extern tree composite_type (tree, tree);
545extern tree build_component_ref (tree, tree);
546extern tree build_array_ref (tree, tree);
547extern tree build_external_ref (tree, int, location_t);
548extern void pop_maybe_used (bool);
549extern struct c_expr c_expr_sizeof_expr (struct c_expr);
550extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
551extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr);
552extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
553					     struct c_expr);
554extern tree build_conditional_expr (tree, tree, tree);
555extern tree build_compound_expr (tree, tree);
556extern tree c_cast_expr (struct c_type_name *, tree);
557extern tree build_c_cast (tree, tree);
558extern void store_init_value (tree, tree);
559extern void error_init (const char *);
560extern void pedwarn_init (const char *);
561extern void maybe_warn_string_init (tree, struct c_expr);
562extern void start_init (tree, tree, int);
563extern void finish_init (void);
564extern void really_start_incremental_init (tree);
565extern void push_init_level (int);
566extern struct c_expr pop_init_level (int);
567extern void set_init_index (tree, tree);
568extern void set_init_label (tree);
569extern void process_init_element (struct c_expr);
570extern tree build_compound_literal (tree, tree);
571extern tree c_start_case (tree);
572extern void c_finish_case (tree);
573extern tree build_asm_expr (tree, tree, tree, tree, bool);
574extern tree build_asm_stmt (tree, tree);
575extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
576extern int c_types_compatible_p (tree, tree);
577extern tree c_begin_compound_stmt (bool);
578extern tree c_end_compound_stmt (tree, bool);
579extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
580/* APPLE LOCAL begin for-fsf-4_4 3274130 5295549 */ \
581extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, tree,
582			   bool);
583/* APPLE LOCAL end for-fsf-4_4 3274130 5295549 */ \
584extern tree c_begin_stmt_expr (void);
585extern tree c_finish_stmt_expr (tree);
586extern tree c_process_expr_stmt (tree);
587extern tree c_finish_expr_stmt (tree);
588extern tree c_finish_return (tree);
589extern tree c_finish_bc_stmt (tree *, bool);
590extern tree c_finish_goto_label (tree);
591extern tree c_finish_goto_ptr (tree);
592extern void c_begin_vm_scope (unsigned int);
593extern void c_end_vm_scope (unsigned int);
594extern tree c_expr_to_decl (tree, bool *, bool *, bool *);
595extern tree c_begin_omp_parallel (void);
596extern tree c_finish_omp_parallel (tree, tree);
597extern tree c_finish_omp_clauses (tree);
598
599/* Set to 0 at beginning of a function definition, set to 1 if
600   a return statement that specifies a return value is seen.  */
601
602extern int current_function_returns_value;
603
604/* Set to 0 at beginning of a function definition, set to 1 if
605   a return statement with no argument is seen.  */
606
607extern int current_function_returns_null;
608
609/* Set to 0 at beginning of a function definition, set to 1 if
610   a call to a noreturn function is seen.  */
611
612extern int current_function_returns_abnormally;
613
614/* Nonzero means we are reading code that came from a system header file.  */
615
616extern int system_header_p;
617
618/* True means global_bindings_p should return false even if the scope stack
619   says we are in file scope.  */
620
621extern bool c_override_global_bindings_to_false;
622
623/* True means we've initialized exception handling.  */
624extern bool c_eh_initialized_p;
625
626/* In c-decl.c */
627extern void c_finish_incomplete_decl (tree);
628extern void c_write_global_declarations (void);
629
630/* In order for the format checking to accept the C frontend
631   diagnostic framework extensions, you must include this file before
632   toplev.h, not after.  */
633#if GCC_VERSION >= 4001
634#define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
635#else
636#define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
637#endif
638
639extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
640extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
641
642#endif /* ! GCC_C_TREE_H */
643