1/* Definitions for C parsing and type checking.
2   Copyright (C) 1987-2015 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3.  If not see
18<http://www.gnu.org/licenses/>.  */
19
20#ifndef GCC_C_TREE_H
21#define GCC_C_TREE_H
22
23#include "c-family/c-common.h"
24#include "diagnostic.h"
25
26/* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
27   know how big it is.  This is sanity-checked in c-decl.c.  */
28#define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
29  (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
30
31/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
32#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
33
34/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
35#define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
36
37/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
38   nonzero if the definition of the type has already started.  */
39#define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
40
41/* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
42   declarations whose type would be completed by completing that type.  */
43#define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
44
45/* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
46   keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
47   and C_RID_YYCODE is the token number wanted by Yacc.  */
48#define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
49
50/* Record whether a type or decl was written with nonconstant size.
51   Note that TYPE_SIZE may have simplified to a constant.  */
52#define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
53#define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
54
55/* Record whether a type is defined inside a struct or union type.
56   This is used for -Wc++-compat. */
57#define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
58
59/* Record whether an "incomplete type" error was given for the type.  */
60#define C_TYPE_ERROR_REPORTED(TYPE) TYPE_LANG_FLAG_3 (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 a PARM_DECL, nonzero if it was declared as an array.  */
73#define C_ARRAY_PARAMETER(NODE) DECL_LANG_FLAG_0 (NODE)
74
75/* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
76   been declared.  */
77#define C_DECL_DECLARED_BUILTIN(EXP)		\
78  DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
79
80/* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
81   built-in prototype and does not have a non-built-in prototype.  */
82#define C_DECL_BUILTIN_PROTOTYPE(EXP)		\
83  DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
84
85/* Record whether a decl was declared register.  This is strictly a
86   front-end flag, whereas DECL_REGISTER is used for code generation;
87   they may differ for structures with volatile fields.  */
88#define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
89
90/* Record whether a decl was used in an expression anywhere except an
91   unevaluated operand of sizeof / typeof / alignof.  This is only
92   used for functions declared static but not defined, though outside
93   sizeof and typeof it is set for other function decls as well.  */
94#define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
95
96/* Record whether a variable has been declared threadprivate by
97   #pragma omp threadprivate.  */
98#define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
99
100/* Nonzero for a decl which either doesn't exist or isn't a prototype.
101   N.B. Could be simplified if all built-in decls had complete prototypes
102   (but this is presently difficult because some of them need FILE*).  */
103#define C_DECL_ISNT_PROTOTYPE(EXP)			\
104       (EXP == 0					\
105	|| (!prototype_p (TREE_TYPE (EXP))	\
106	    && !DECL_BUILT_IN (EXP)))
107
108/* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
109   TYPE_ARG_TYPES for functions with prototypes, but created for functions
110   without prototypes.  */
111#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
112
113/* For a CONSTRUCTOR, whether some initializer contains a
114   subexpression meaning it is not a constant expression.  */
115#define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
116
117/* Record parser information about an expression that is irrelevant
118   for code generation alongside a tree representing its value.  */
119struct c_expr
120{
121  /* The value of the expression.  */
122  tree value;
123  /* Record the original unary/binary operator of an expression, which may
124     have been changed by fold, STRING_CST for unparenthesized string
125     constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
126     (even if parenthesized), for subexpressions, and for non-constant
127     initializers, or ERROR_MARK for other expressions (including
128     parenthesized expressions).  */
129  enum tree_code original_code;
130  /* If not NULL, the original type of an expression.  This will
131     differ from the type of the value field for an enum constant.
132     The type of an enum constant is a plain integer type, but this
133     field will be the enum type.  */
134  tree original_type;
135};
136
137/* Type alias for struct c_expr. This allows to use the structure
138   inside the VEC types.  */
139typedef struct c_expr c_expr_t;
140
141/* A kind of type specifier.  Note that this information is currently
142   only used to distinguish tag definitions, tag references and typeof
143   uses.  */
144enum c_typespec_kind {
145  /* No typespec.  This appears only in struct c_declspec.  */
146  ctsk_none,
147  /* A reserved keyword type specifier.  */
148  ctsk_resword,
149  /* A reference to a tag, previously declared, such as "struct foo".
150     This includes where the previous declaration was as a different
151     kind of tag, in which case this is only valid if shadowing that
152     tag in an inner scope.  */
153  ctsk_tagref,
154  /* A reference to a tag, not previously declared in a visible
155     scope.  */
156  ctsk_tagfirstref,
157  /* A definition of a tag such as "struct foo { int a; }".  */
158  ctsk_tagdef,
159  /* A typedef name.  */
160  ctsk_typedef,
161  /* An ObjC-specific kind of type specifier.  */
162  ctsk_objc,
163  /* A typeof specifier, or _Atomic ( type-name ).  */
164  ctsk_typeof
165};
166
167/* A type specifier: this structure is created in the parser and
168   passed to declspecs_add_type only.  */
169struct c_typespec {
170  /* What kind of type specifier this is.  */
171  enum c_typespec_kind kind;
172  /* Whether the expression has operands suitable for use in constant
173     expressions.  */
174  bool expr_const_operands;
175  /* The specifier itself.  */
176  tree spec;
177  /* An expression to be evaluated before the type specifier, in the
178     case of typeof specifiers, or NULL otherwise or if no such
179     expression is required for a particular typeof specifier.  In
180     particular, when typeof is applied to an expression of variably
181     modified type, that expression must be evaluated in order to
182     determine array sizes that form part of the type, but the
183     expression itself (as opposed to the array sizes) forms no part
184     of the type and so needs to be recorded separately.  */
185  tree expr;
186};
187
188/* A storage class specifier.  */
189enum c_storage_class {
190  csc_none,
191  csc_auto,
192  csc_extern,
193  csc_register,
194  csc_static,
195  csc_typedef
196};
197
198/* A type specifier keyword "void", "_Bool", "char", "int", "float",
199   "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
200   or none of these.  */
201enum c_typespec_keyword {
202  cts_none,
203  cts_void,
204  cts_bool,
205  cts_char,
206  cts_int,
207  cts_float,
208  cts_int_n,
209  cts_double,
210  cts_dfloat32,
211  cts_dfloat64,
212  cts_dfloat128,
213  cts_fract,
214  cts_accum,
215  cts_auto_type
216};
217
218/* This enum lists all the possible declarator specifiers, storage
219   class or attribute that a user can write.  There is at least one
220   enumerator per possible declarator specifier in the struct
221   c_declspecs below.
222
223   It is used to index the array of declspec locations in struct
224   c_declspecs.  */
225enum c_declspec_word {
226  cdw_typespec /* A catch-all for a typespec.  */,
227  cdw_storage_class  /* A catch-all for a storage class */,
228  cdw_attributes,
229  cdw_typedef,
230  cdw_explicit_signed,
231  cdw_deprecated,
232  cdw_default_int,
233  cdw_long,
234  cdw_long_long,
235  cdw_short,
236  cdw_signed,
237  cdw_unsigned,
238  cdw_complex,
239  cdw_inline,
240  cdw_noreturn,
241  cdw_thread,
242  cdw_const,
243  cdw_volatile,
244  cdw_restrict,
245  cdw_saturating,
246  cdw_alignas,
247  cdw_address_space,
248  cdw_number_of_elements /* This one must always be the last
249			    enumerator.  */
250};
251
252/* A sequence of declaration specifiers in C.  When a new declaration
253   specifier is added, please update the enum c_declspec_word above
254   accordingly.  */
255struct c_declspecs {
256  source_location locations[cdw_number_of_elements];
257  /* The type specified, if a single type specifier such as a struct,
258     union or enum specifier, typedef name or typeof specifies the
259     whole type, or NULL_TREE if none or a keyword such as "void" or
260     "char" is used.  Does not include qualifiers.  */
261  tree type;
262  /* Any expression to be evaluated before the type, from a typeof
263     specifier.  */
264  tree expr;
265  /* The attributes from a typedef decl.  */
266  tree decl_attr;
267  /* When parsing, the attributes.  Outside the parser, this will be
268     NULL; attributes (possibly from multiple lists) will be passed
269     separately.  */
270  tree attrs;
271  /* The base-2 log of the greatest alignment required by an _Alignas
272     specifier, in bytes, or -1 if no such specifiers with nonzero
273     alignment.  */
274  int align_log;
275  /* For the __intN declspec, this stores the index into the int_n_* arrays.  */
276  int int_n_idx;
277  /* The storage class specifier, or csc_none if none.  */
278  enum c_storage_class storage_class;
279  /* Any type specifier keyword used such as "int", not reflecting
280     modifiers such as "short", or cts_none if none.  */
281  ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
282  /* The kind of type specifier if one has been seen, ctsk_none
283     otherwise.  */
284  ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
285  /* Whether any expressions in typeof specifiers may appear in
286     constant expressions.  */
287  BOOL_BITFIELD expr_const_operands : 1;
288  /* Whether any declaration specifiers have been seen at all.  */
289  BOOL_BITFIELD declspecs_seen_p : 1;
290  /* Whether something other than a storage class specifier or
291     attribute has been seen.  This is used to warn for the
292     obsolescent usage of storage class specifiers other than at the
293     start of the list.  (Doing this properly would require function
294     specifiers to be handled separately from storage class
295     specifiers.)  */
296  BOOL_BITFIELD non_sc_seen_p : 1;
297  /* Whether the type is specified by a typedef or typeof name.  */
298  BOOL_BITFIELD typedef_p : 1;
299  /* Whether the type is explicitly "signed" or specified by a typedef
300     whose type is explicitly "signed".  */
301  BOOL_BITFIELD explicit_signed_p : 1;
302  /* Whether the specifiers include a deprecated typedef.  */
303  BOOL_BITFIELD deprecated_p : 1;
304  /* Whether the type defaulted to "int" because there were no type
305     specifiers.  */
306  BOOL_BITFIELD default_int_p : 1;
307  /* Whether "long" was specified.  */
308  BOOL_BITFIELD long_p : 1;
309  /* Whether "long" was specified more than once.  */
310  BOOL_BITFIELD long_long_p : 1;
311  /* Whether "short" was specified.  */
312  BOOL_BITFIELD short_p : 1;
313  /* Whether "signed" was specified.  */
314  BOOL_BITFIELD signed_p : 1;
315  /* Whether "unsigned" was specified.  */
316  BOOL_BITFIELD unsigned_p : 1;
317  /* Whether "complex" was specified.  */
318  BOOL_BITFIELD complex_p : 1;
319  /* Whether "inline" was specified.  */
320  BOOL_BITFIELD inline_p : 1;
321  /* Whether "_Noreturn" was speciied.  */
322  BOOL_BITFIELD noreturn_p : 1;
323  /* Whether "__thread" or "_Thread_local" was specified.  */
324  BOOL_BITFIELD thread_p : 1;
325  /* Whether "__thread" rather than "_Thread_local" was specified.  */
326  BOOL_BITFIELD thread_gnu_p : 1;
327  /* Whether "const" was specified.  */
328  BOOL_BITFIELD const_p : 1;
329  /* Whether "volatile" was specified.  */
330  BOOL_BITFIELD volatile_p : 1;
331  /* Whether "restrict" was specified.  */
332  BOOL_BITFIELD restrict_p : 1;
333  /* Whether "_Atomic" was specified.  */
334  BOOL_BITFIELD atomic_p : 1;
335  /* Whether "_Sat" was specified.  */
336  BOOL_BITFIELD saturating_p : 1;
337  /* Whether any alignment specifier (even with zero alignment) was
338     specified.  */
339  BOOL_BITFIELD alignas_p : 1;
340  /* The address space that the declaration belongs to.  */
341  addr_space_t address_space;
342};
343
344/* The various kinds of declarators in C.  */
345enum c_declarator_kind {
346  /* An identifier.  */
347  cdk_id,
348  /* A function.  */
349  cdk_function,
350  /* An array.  */
351  cdk_array,
352  /* A pointer.  */
353  cdk_pointer,
354  /* Parenthesized declarator with nested attributes.  */
355  cdk_attrs
356};
357
358typedef struct c_arg_tag_d {
359  /* The argument name.  */
360  tree id;
361  /* The type of the argument.  */
362  tree type;
363} c_arg_tag;
364
365
366/* Information about the parameters in a function declarator.  */
367struct c_arg_info {
368  /* A list of parameter decls.  */
369  tree parms;
370  /* A list of structure, union and enum tags defined.  */
371  vec<c_arg_tag, va_gc> *tags;
372  /* A list of argument types to go in the FUNCTION_TYPE.  */
373  tree types;
374  /* A list of non-parameter decls (notably enumeration constants)
375     defined with the parameters.  */
376  tree others;
377  /* A compound expression of VLA sizes from the parameters, or NULL.
378     In a function definition, these are used to ensure that
379     side-effects in sizes of arrays converted to pointers (such as a
380     parameter int i[n++]) take place; otherwise, they are
381     ignored.  */
382  tree pending_sizes;
383  /* True when these arguments had [*].  */
384  BOOL_BITFIELD had_vla_unspec : 1;
385};
386
387/* A declarator.  */
388struct c_declarator {
389  /* The kind of declarator.  */
390  enum c_declarator_kind kind;
391  location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
392  /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
393  struct c_declarator *declarator;
394  union {
395    /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
396       declarator.  */
397    tree id;
398    /* For functions.  */
399    struct c_arg_info *arg_info;
400    /* For arrays.  */
401    struct {
402      /* The array dimension, or NULL for [] and [*].  */
403      tree dimen;
404      /* The qualifiers inside [].  */
405      int quals;
406      /* The attributes (currently ignored) inside [].  */
407      tree attrs;
408      /* Whether [static] was used.  */
409      BOOL_BITFIELD static_p : 1;
410      /* Whether [*] was used.  */
411      BOOL_BITFIELD vla_unspec_p : 1;
412    } array;
413    /* For pointers, the qualifiers on the pointer type.  */
414    int pointer_quals;
415    /* For attributes.  */
416    tree attrs;
417  } u;
418};
419
420/* A type name.  */
421struct c_type_name {
422  /* The declaration specifiers.  */
423  struct c_declspecs *specs;
424  /* The declarator.  */
425  struct c_declarator *declarator;
426};
427
428/* A parameter.  */
429struct c_parm {
430  /* The declaration specifiers, minus any prefix attributes.  */
431  struct c_declspecs *specs;
432  /* The attributes.  */
433  tree attrs;
434  /* The declarator.  */
435  struct c_declarator *declarator;
436};
437
438/* Used when parsing an enum.  Initialized by start_enum.  */
439struct c_enum_contents
440{
441  /* While defining an enum type, this is 1 plus the last enumerator
442     constant value.  */
443  tree enum_next_value;
444
445  /* Nonzero means that there was overflow computing enum_next_value.  */
446  int enum_overflow;
447};
448
449/* A type of reference to a static identifier in an inline
450   function.  */
451enum c_inline_static_type {
452  /* Identifier with internal linkage used in function that may be an
453     inline definition (i.e., file-scope static).  */
454  csi_internal,
455  /* Modifiable object with static storage duration defined in
456     function that may be an inline definition (i.e., local
457     static).  */
458  csi_modifiable
459};
460
461
462/* in c-parser.c */
463extern void c_parse_init (void);
464
465/* in c-aux-info.c */
466extern void gen_aux_info_record (tree, int, int, int);
467
468/* in c-decl.c */
469struct c_spot_bindings;
470struct c_struct_parse_info;
471extern struct obstack parser_obstack;
472extern tree c_break_label;
473extern tree c_cont_label;
474
475extern bool global_bindings_p (void);
476extern void push_scope (void);
477extern tree pop_scope (void);
478extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
479extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
480
481extern void record_inline_static (location_t, tree, tree,
482				  enum c_inline_static_type);
483extern void c_init_decl_processing (void);
484extern void c_print_identifier (FILE *, tree, int);
485extern int quals_from_declspecs (const struct c_declspecs *);
486extern struct c_declarator *build_array_declarator (location_t, tree,
487    						    struct c_declspecs *,
488						    bool, bool);
489extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
490			      tree, tree);
491extern tree check_for_loop_decls (location_t, bool);
492extern void mark_forward_parm_decls (void);
493extern void declare_parm_level (void);
494extern void undeclared_variable (location_t, tree);
495extern tree lookup_label_for_goto (location_t, tree);
496extern tree declare_label (tree);
497extern tree define_label (location_t, tree);
498extern struct c_spot_bindings *c_get_switch_bindings (void);
499extern void c_release_switch_bindings (struct c_spot_bindings *);
500extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
501					  location_t, location_t);
502extern void finish_decl (tree, location_t, tree, tree, tree);
503extern tree finish_enum (tree, tree, tree);
504extern void finish_function (void);
505extern tree finish_struct (location_t, tree, tree, tree,
506			   struct c_struct_parse_info *);
507extern struct c_arg_info *build_arg_info (void);
508extern struct c_arg_info *get_parm_info (bool, tree);
509extern tree grokfield (location_t, struct c_declarator *,
510		       struct c_declspecs *, tree, tree *);
511extern tree groktypename (struct c_type_name *, tree *, bool *);
512extern tree grokparm (const struct c_parm *, tree *);
513extern tree implicitly_declare (location_t, tree);
514extern void keep_next_level (void);
515extern void pending_xref_error (void);
516extern void c_push_function_context (void);
517extern void c_pop_function_context (void);
518extern void push_parm_decl (const struct c_parm *, tree *);
519extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
520							struct c_declarator *);
521extern tree c_builtin_function (tree);
522extern tree c_builtin_function_ext_scope (tree);
523extern void shadow_tag (const struct c_declspecs *);
524extern void shadow_tag_warned (const struct c_declspecs *, int);
525extern tree start_enum (location_t, struct c_enum_contents *, tree);
526extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
527extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
528			tree);
529extern tree start_struct (location_t, enum tree_code, tree,
530			  struct c_struct_parse_info **);
531extern void store_parm_decls (void);
532extern void store_parm_decls_from (struct c_arg_info *);
533extern void temp_store_parm_decls (tree, tree);
534extern void temp_pop_parm_decls (void);
535extern tree xref_tag (enum tree_code, tree);
536extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
537extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
538				    struct c_declarator *);
539extern struct c_declarator *build_attrs_declarator (tree,
540						    struct c_declarator *);
541extern struct c_declarator *build_function_declarator (struct c_arg_info *,
542						       struct c_declarator *);
543extern struct c_declarator *build_id_declarator (tree);
544extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
545						     struct c_declarator *);
546extern struct c_declspecs *build_null_declspecs (void);
547extern struct c_declspecs *declspecs_add_qual (source_location,
548					       struct c_declspecs *, tree);
549extern struct c_declspecs *declspecs_add_type (location_t,
550					       struct c_declspecs *,
551					       struct c_typespec);
552extern struct c_declspecs *declspecs_add_scspec (source_location,
553						 struct c_declspecs *, tree);
554extern struct c_declspecs *declspecs_add_attrs (source_location,
555						struct c_declspecs *, tree);
556extern struct c_declspecs *declspecs_add_addrspace (source_location,
557						    struct c_declspecs *,
558						    addr_space_t);
559extern struct c_declspecs *declspecs_add_alignas (source_location,
560						  struct c_declspecs *, tree);
561extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
562
563/* in c-objc-common.c */
564extern bool c_objc_common_init (void);
565extern bool c_missing_noreturn_ok_p (tree);
566extern bool c_warn_unused_global_decl (const_tree);
567extern void c_initialize_diagnostics (diagnostic_context *);
568extern bool c_vla_unspec_p (tree x, tree fn);
569
570/* in c-typeck.c */
571extern int in_alignof;
572extern int in_sizeof;
573extern int in_typeof;
574
575extern tree c_last_sizeof_arg;
576
577extern struct c_switch *c_switch_stack;
578
579extern tree c_objc_common_truthvalue_conversion (location_t, tree);
580extern tree require_complete_type (tree);
581extern int same_translation_unit_p (const_tree, const_tree);
582extern int comptypes (tree, tree);
583extern int comptypes_check_different_types (tree, tree, bool *);
584extern bool c_vla_type_p (const_tree);
585extern bool c_mark_addressable (tree);
586extern void c_incomplete_type_error (const_tree, const_tree);
587extern tree c_type_promotes_to (tree);
588extern struct c_expr default_function_array_conversion (location_t,
589							struct c_expr);
590extern struct c_expr default_function_array_read_conversion (location_t,
591							     struct c_expr);
592extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
593					       bool, bool);
594extern void mark_exp_read (tree);
595extern tree composite_type (tree, tree);
596extern tree build_component_ref (location_t, tree, tree);
597extern tree build_array_ref (location_t, tree, tree);
598extern tree build_external_ref (location_t, tree, int, tree *);
599extern void pop_maybe_used (bool);
600extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
601extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
602extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
603    					    struct c_expr);
604extern struct c_expr parser_build_binary_op (location_t,
605    					     enum tree_code, struct c_expr,
606					     struct c_expr);
607extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
608				    tree, tree);
609extern tree build_compound_expr (location_t, tree, tree);
610extern tree c_cast_expr (location_t, struct c_type_name *, tree);
611extern tree build_c_cast (location_t, tree, tree);
612extern void store_init_value (location_t, tree, tree, tree);
613extern void maybe_warn_string_init (location_t, tree, struct c_expr);
614extern void start_init (tree, tree, int);
615extern void finish_init (void);
616extern void really_start_incremental_init (tree);
617extern void finish_implicit_inits (location_t, struct obstack *);
618extern void push_init_level (location_t, int, struct obstack *);
619extern struct c_expr pop_init_level (location_t, int, struct obstack *);
620extern void set_init_index (location_t, tree, tree, struct obstack *);
621extern void set_init_label (location_t, tree, struct obstack *);
622extern void process_init_element (location_t, struct c_expr, bool,
623				  struct obstack *);
624extern tree build_compound_literal (location_t, tree, tree, bool);
625extern void check_compound_literal_type (location_t, struct c_type_name *);
626extern tree c_start_case (location_t, location_t, tree, bool);
627extern void c_finish_case (tree, tree);
628extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
629extern tree build_asm_stmt (tree, tree);
630extern int c_types_compatible_p (tree, tree);
631extern tree c_begin_compound_stmt (bool);
632extern tree c_end_compound_stmt (location_t, tree, bool);
633extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
634extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
635extern tree c_begin_stmt_expr (void);
636extern tree c_finish_stmt_expr (location_t, tree);
637extern tree c_process_expr_stmt (location_t, tree);
638extern tree c_finish_expr_stmt (location_t, tree);
639extern tree c_finish_return (location_t, tree, tree);
640extern tree c_finish_bc_stmt (location_t, tree *, bool);
641extern tree c_finish_goto_label (location_t, tree);
642extern tree c_finish_goto_ptr (location_t, tree);
643extern tree c_expr_to_decl (tree, bool *, bool *);
644extern tree c_finish_oacc_parallel (location_t, tree, tree);
645extern tree c_finish_oacc_kernels (location_t, tree, tree);
646extern tree c_finish_oacc_data (location_t, tree, tree);
647extern tree c_begin_omp_parallel (void);
648extern tree c_finish_omp_parallel (location_t, tree, tree);
649extern tree c_begin_omp_task (void);
650extern tree c_finish_omp_task (location_t, tree, tree);
651extern void c_finish_omp_cancel (location_t, tree);
652extern void c_finish_omp_cancellation_point (location_t, tree);
653extern tree c_finish_omp_clauses (tree);
654extern tree c_build_va_arg (location_t, tree, tree);
655extern tree c_finish_transaction (location_t, tree, int);
656extern bool c_tree_equal (tree, tree);
657extern tree c_build_function_call_vec (location_t, vec<location_t>, tree,
658				       vec<tree, va_gc> *, vec<tree, va_gc> *);
659
660/* Set to 0 at beginning of a function definition, set to 1 if
661   a return statement that specifies a return value is seen.  */
662
663extern int current_function_returns_value;
664
665/* Set to 0 at beginning of a function definition, set to 1 if
666   a return statement with no argument is seen.  */
667
668extern int current_function_returns_null;
669
670/* Set to 0 at beginning of a function definition, set to 1 if
671   a call to a noreturn function is seen.  */
672
673extern int current_function_returns_abnormally;
674
675/* In c-decl.c */
676
677/* Tell the binding oracle what kind of binding we are looking for.  */
678
679enum c_oracle_request
680{
681  C_ORACLE_SYMBOL,
682  C_ORACLE_TAG,
683  C_ORACLE_LABEL
684};
685
686/* If this is non-NULL, then it is a "binding oracle" which can lazily
687   create bindings when needed by the C compiler.  The oracle is told
688   the name and type of the binding to create.  It can call pushdecl
689   or the like to ensure the binding is visible; or do nothing,
690   leaving the binding untouched.  c-decl.c takes note of when the
691   oracle has been called and will not call it again if it fails to
692   create a given binding.  */
693
694typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier);
695
696extern c_binding_oracle_function *c_binding_oracle;
697
698extern void c_finish_incomplete_decl (tree);
699extern void c_write_global_declarations (void);
700extern tree c_omp_reduction_id (enum tree_code, tree);
701extern tree c_omp_reduction_decl (tree);
702extern tree c_omp_reduction_lookup (tree, tree);
703extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
704extern void c_pushtag (location_t, tree, tree);
705extern void c_bind (location_t, tree, bool);
706
707/* In c-errors.c */
708extern void pedwarn_c90 (location_t, int opt, const char *, ...)
709    ATTRIBUTE_GCC_DIAG(3,4);
710extern bool pedwarn_c99 (location_t, int opt, const char *, ...)
711    ATTRIBUTE_GCC_DIAG(3,4);
712
713#endif /* ! GCC_C_TREE_H */
714