1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987-2022 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
23 #include "c-family/c-common.h"
24 #include "diagnostic.h"
26 /* struct lang_identifier is private to c-decl.cc, but langhooks.cc needs to
27 know how big it is. This is sanity-checked in c-decl.cc. */
28 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
29 (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
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)
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)
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)
41 /* In an incomplete RECORD_TYPE, UNION_TYPE or ENUMERAL_TYPE, a list of
42 variable declarations whose type would be completed by completing
44 #define C_TYPE_INCOMPLETE_VARS(TYPE) \
45 TYPE_LANG_SLOT_1 (TREE_CHECK4 (TYPE, RECORD_TYPE, UNION_TYPE, \
46 QUAL_UNION_TYPE, ENUMERAL_TYPE))
48 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
49 keyword. C_RID_CODE (node) is then the RID_* value of the keyword. */
50 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
52 /* Record whether a type or decl was written with nonconstant size.
53 Note that TYPE_SIZE may have simplified to a constant. */
54 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
55 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
57 /* Record whether a type is defined inside a struct or union type.
58 This is used for -Wc++-compat. */
59 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
61 /* Record whether a typedef for type `int' was actually `signed int'. */
62 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
64 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
66 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
68 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
69 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
71 /* For a PARM_DECL, nonzero if it was declared as an array. */
72 #define C_ARRAY_PARAMETER(NODE) DECL_LANG_FLAG_0 (NODE)
74 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
76 #define C_DECL_DECLARED_BUILTIN(EXP) \
77 DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
79 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
80 built-in prototype and does not have a non-built-in prototype. */
81 #define C_DECL_BUILTIN_PROTOTYPE(EXP) \
82 DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
84 /* Record whether a decl was declared register. This is strictly a
85 front-end flag, whereas DECL_REGISTER is used for code generation;
86 they may differ for structures with volatile fields. */
87 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
89 /* Record whether a decl was used in an expression anywhere except an
90 unevaluated operand of sizeof / typeof / alignof. This is only
91 used for functions declared static but not defined, though outside
92 sizeof and typeof it is set for other function decls as well. */
93 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
95 /* Record whether a variable has been declared threadprivate by
96 #pragma omp threadprivate. */
97 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
99 /* Set on VAR_DECLs for compound literals. */
100 #define C_DECL_COMPOUND_LITERAL_P(DECL) \
101 DECL_LANG_FLAG_5 (VAR_DECL_CHECK (DECL))
103 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
104 N.B. Could be simplified if all built-in decls had complete prototypes
105 (but this is presently difficult because some of them need FILE*). */
106 #define C_DECL_ISNT_PROTOTYPE(EXP) \
108 || (!prototype_p (TREE_TYPE (EXP)) \
109 && !fndecl_built_in_p (EXP)))
111 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
112 TYPE_ARG_TYPES for functions with prototypes, but created for functions
113 without prototypes. */
114 #define TYPE_ACTUAL_ARG_TYPES(NODE) \
115 TYPE_LANG_SLOT_1 (FUNCTION_TYPE_CHECK (NODE))
117 /* For a CONSTRUCTOR, whether some initializer contains a
118 subexpression meaning it is not a constant expression. */
119 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
121 /* For a SAVE_EXPR, nonzero if the operand of the SAVE_EXPR has already
123 #define SAVE_EXPR_FOLDED_P(EXP) TREE_LANG_FLAG_1 (SAVE_EXPR_CHECK (EXP))
125 /* Record parser information about an expression that is irrelevant
126 for code generation alongside a tree representing its value. */
129 /* The value of the expression. */
131 /* Record the original unary/binary operator of an expression, which may
132 have been changed by fold, STRING_CST for unparenthesized string
133 constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
134 (even if parenthesized), for subexpressions, and for non-constant
135 initializers, or ERROR_MARK for other expressions (including
136 parenthesized expressions). */
137 enum tree_code original_code;
138 /* If not NULL, the original type of an expression. This will
139 differ from the type of the value field for an enum constant.
140 The type of an enum constant is a plain integer type, but this
141 field will be the enum type. */
144 /* The source range of this expression. This is redundant
145 for node values that have locations, but not all node kinds
146 have locations (e.g. constants, and references to params, locals,
147 etc), so we stash a copy here. */
148 source_range src_range;
150 /* True if this was directly from a decimal constant token. */
153 /* Access to the first and last locations within the source spelling
154 of this expression. */
155 location_t get_start () const { return src_range.m_start; }
156 location_t get_finish () const { return src_range.m_finish; }
158 location_t get_location () const
160 if (EXPR_HAS_LOCATION (value))
161 return EXPR_LOCATION (value);
163 return make_location (get_start (), get_start (), get_finish ());
166 /* Set the value to error_mark_node whilst ensuring that src_range
167 and m_decimal are initialized. */
170 value = error_mark_node;
171 src_range.m_start = UNKNOWN_LOCATION;
172 src_range.m_finish = UNKNOWN_LOCATION;
177 /* Type alias for struct c_expr. This allows to use the structure
178 inside the VEC types. */
179 typedef struct c_expr c_expr_t;
181 /* A kind of type specifier. Note that this information is currently
182 only used to distinguish tag definitions, tag references and typeof
184 enum c_typespec_kind {
185 /* No typespec. This appears only in struct c_declspec. */
187 /* A reserved keyword type specifier. */
189 /* A reference to a tag, previously declared, such as "struct foo".
190 This includes where the previous declaration was as a different
191 kind of tag, in which case this is only valid if shadowing that
192 tag in an inner scope. */
194 /* Likewise, with standard attributes present in the reference. */
196 /* A reference to a tag, not previously declared in a visible
199 /* Likewise, with standard attributes present in the reference. */
200 ctsk_tagfirstref_attrs,
201 /* A definition of a tag such as "struct foo { int a; }". */
203 /* A typedef name. */
205 /* An ObjC-specific kind of type specifier. */
207 /* A typeof specifier, or _Atomic ( type-name ). */
211 /* A type specifier: this structure is created in the parser and
212 passed to declspecs_add_type only. */
214 /* What kind of type specifier this is. */
215 enum c_typespec_kind kind;
216 /* Whether the expression has operands suitable for use in constant
218 bool expr_const_operands;
219 /* The specifier itself. */
221 /* An expression to be evaluated before the type specifier, in the
222 case of typeof specifiers, or NULL otherwise or if no such
223 expression is required for a particular typeof specifier. In
224 particular, when typeof is applied to an expression of variably
225 modified type, that expression must be evaluated in order to
226 determine array sizes that form part of the type, but the
227 expression itself (as opposed to the array sizes) forms no part
228 of the type and so needs to be recorded separately. */
232 /* A storage class specifier. */
233 enum c_storage_class {
242 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
243 "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
245 enum c_typespec_keyword {
263 /* This enum lists all the possible declarator specifiers, storage
264 class or attribute that a user can write. There is at least one
265 enumerator per possible declarator specifier in the struct
268 It is used to index the array of declspec locations in struct
270 enum c_declspec_word {
271 cdw_typespec /* A catch-all for a typespec. */,
272 cdw_storage_class /* A catch-all for a storage class */,
296 cdw_number_of_elements /* This one must always be the last
302 cdil_gimple, /* __GIMPLE */
303 cdil_gimple_cfg, /* __GIMPLE(cfg) */
304 cdil_gimple_ssa, /* __GIMPLE(ssa) */
308 /* A sequence of declaration specifiers in C. When a new declaration
309 specifier is added, please update the enum c_declspec_word above
312 location_t locations[cdw_number_of_elements];
313 /* The type specified, if a single type specifier such as a struct,
314 union or enum specifier, typedef name or typeof specifies the
315 whole type, or NULL_TREE if none or a keyword such as "void" or
316 "char" is used. Does not include qualifiers. */
318 /* Any expression to be evaluated before the type, from a typeof
321 /* The attributes from a typedef decl. */
323 /* When parsing, the GNU attributes and prefix standard attributes.
324 Outside the parser, this will be NULL; attributes (possibly from
325 multiple lists) will be passed separately. */
327 /* When parsing, postfix standard attributes (which appertain to the
328 type specified by the preceding declaration specifiers, unlike
329 prefix standard attributes which appertain to the declaration or
330 declarations as a whole). */
332 /* The pass to start compiling a __GIMPLE or __RTL function with. */
333 char *gimple_or_rtl_pass;
334 /* ENTRY BB count. */
335 profile_count entry_bb_count;
336 /* The base-2 log of the greatest alignment required by an _Alignas
337 specifier, in bytes, or -1 if no such specifiers with nonzero
340 /* For the __intN declspec, this stores the index into the int_n_* arrays. */
342 /* For the _FloatN and _FloatNx declspec, this stores the index into
343 the floatn_nx_types array. */
345 /* The storage class specifier, or csc_none if none. */
346 enum c_storage_class storage_class;
347 /* Any type specifier keyword used such as "int", not reflecting
348 modifiers such as "short", or cts_none if none. */
349 ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
350 /* The kind of type specifier if one has been seen, ctsk_none
352 ENUM_BITFIELD (c_typespec_kind) typespec_kind : 4;
353 ENUM_BITFIELD (c_declspec_il) declspec_il : 3;
354 /* Whether any expressions in typeof specifiers may appear in
355 constant expressions. */
356 BOOL_BITFIELD expr_const_operands : 1;
357 /* Whether any declaration specifiers have been seen at all. */
358 BOOL_BITFIELD declspecs_seen_p : 1;
359 /* Whether any declaration specifiers other than standard attributes
360 have been seen at all. If only standard attributes have been
361 seen, this is an attribute-declaration. */
362 BOOL_BITFIELD non_std_attrs_seen_p : 1;
363 /* Whether something other than a storage class specifier or
364 attribute has been seen. This is used to warn for the
365 obsolescent usage of storage class specifiers other than at the
366 start of the list. (Doing this properly would require function
367 specifiers to be handled separately from storage class
369 BOOL_BITFIELD non_sc_seen_p : 1;
370 /* Whether the type is specified by a typedef or typeof name. */
371 BOOL_BITFIELD typedef_p : 1;
372 /* Whether the type is explicitly "signed" or specified by a typedef
373 whose type is explicitly "signed". */
374 BOOL_BITFIELD explicit_signed_p : 1;
375 /* Whether the specifiers include a deprecated typedef. */
376 BOOL_BITFIELD deprecated_p : 1;
377 /* Whether the specifiers include an unavailable typedef. */
378 BOOL_BITFIELD unavailable_p : 1;
379 /* Whether the type defaulted to "int" because there were no type
381 BOOL_BITFIELD default_int_p : 1;
382 /* Whether "long" was specified. */
383 BOOL_BITFIELD long_p : 1;
384 /* Whether "long" was specified more than once. */
385 BOOL_BITFIELD long_long_p : 1;
386 /* Whether "short" was specified. */
387 BOOL_BITFIELD short_p : 1;
388 /* Whether "signed" was specified. */
389 BOOL_BITFIELD signed_p : 1;
390 /* Whether "unsigned" was specified. */
391 BOOL_BITFIELD unsigned_p : 1;
392 /* Whether "complex" was specified. */
393 BOOL_BITFIELD complex_p : 1;
394 /* Whether "inline" was specified. */
395 BOOL_BITFIELD inline_p : 1;
396 /* Whether "_Noreturn" was speciied. */
397 BOOL_BITFIELD noreturn_p : 1;
398 /* Whether "__thread" or "_Thread_local" was specified. */
399 BOOL_BITFIELD thread_p : 1;
400 /* Whether "__thread" rather than "_Thread_local" was specified. */
401 BOOL_BITFIELD thread_gnu_p : 1;
402 /* Whether "const" was specified. */
403 BOOL_BITFIELD const_p : 1;
404 /* Whether "volatile" was specified. */
405 BOOL_BITFIELD volatile_p : 1;
406 /* Whether "restrict" was specified. */
407 BOOL_BITFIELD restrict_p : 1;
408 /* Whether "_Atomic" was specified. */
409 BOOL_BITFIELD atomic_p : 1;
410 /* Whether "_Sat" was specified. */
411 BOOL_BITFIELD saturating_p : 1;
412 /* Whether any alignment specifier (even with zero alignment) was
414 BOOL_BITFIELD alignas_p : 1;
415 /* The address space that the declaration belongs to. */
416 addr_space_t address_space;
419 /* The various kinds of declarators in C. */
420 enum c_declarator_kind {
429 /* Parenthesized declarator with nested attributes. */
434 /* The argument name. */
436 /* The type of the argument. */
441 /* Information about the parameters in a function declarator. */
443 /* A list of parameter decls. */
445 /* A list of structure, union and enum tags defined. */
446 vec<c_arg_tag, va_gc> *tags;
447 /* A list of argument types to go in the FUNCTION_TYPE. */
449 /* A list of non-parameter decls (notably enumeration constants)
450 defined with the parameters. */
452 /* A compound expression of VLA sizes from the parameters, or NULL.
453 In a function definition, these are used to ensure that
454 side-effects in sizes of arrays converted to pointers (such as a
455 parameter int i[n++]) take place; otherwise, they are
458 /* True when these arguments had [*]. */
459 BOOL_BITFIELD had_vla_unspec : 1;
463 struct c_declarator {
464 /* The kind of declarator. */
465 enum c_declarator_kind kind;
466 location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
467 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */
468 struct c_declarator *declarator;
470 /* For identifiers. */
472 /* An IDENTIFIER_NODE, or NULL_TREE if an abstract
475 /* Any attributes (which apply to the declaration rather than to
476 the type described by the outer declarators). */
480 struct c_arg_info *arg_info;
483 /* The array dimension, or NULL for [] and [*]. */
485 /* The qualifiers inside []. */
487 /* The attributes (currently ignored) inside []. */
489 /* Whether [static] was used. */
490 BOOL_BITFIELD static_p : 1;
491 /* Whether [*] was used. */
492 BOOL_BITFIELD vla_unspec_p : 1;
494 /* For pointers, the qualifiers on the pointer type. */
496 /* For attributes. */
503 /* The declaration specifiers. */
504 struct c_declspecs *specs;
505 /* The declarator. */
506 struct c_declarator *declarator;
511 /* The declaration specifiers, minus any prefix attributes. */
512 struct c_declspecs *specs;
513 /* The attributes. */
515 /* The declarator. */
516 struct c_declarator *declarator;
517 /* The location of the parameter. */
521 /* Used when parsing an enum. Initialized by start_enum. */
522 struct c_enum_contents
524 /* While defining an enum type, this is 1 plus the last enumerator
526 tree enum_next_value;
528 /* Nonzero means that there was overflow computing enum_next_value. */
532 /* A type of reference to a static identifier in an inline
534 enum c_inline_static_type {
535 /* Identifier with internal linkage used in function that may be an
536 inline definition (i.e., file-scope static). */
538 /* Modifiable object with static storage duration defined in
539 function that may be an inline definition (i.e., local
546 extern void c_parse_init (void);
547 extern bool c_keyword_starts_typename (enum rid keyword);
549 /* in c-aux-info.cc */
550 extern void gen_aux_info_record (tree, int, int, int);
553 struct c_spot_bindings;
554 class c_struct_parse_info;
555 extern struct obstack parser_obstack;
556 /* Set to IN_ITERATION_STMT if parsing an iteration-statement,
557 to IN_OMP_BLOCK if parsing OpenMP structured block and
558 IN_OMP_FOR if parsing OpenMP loop. If parsing a switch statement,
559 this is bitwise ORed with IN_SWITCH_STMT, unless parsing an
560 iteration-statement, OpenMP block or loop within that switch. */
561 #define IN_SWITCH_STMT 1
562 #define IN_ITERATION_STMT 2
563 #define IN_OMP_BLOCK 4
565 #define IN_OBJC_FOREACH 16
566 extern unsigned char in_statement;
568 extern bool switch_statement_break_seen_p;
570 extern bool global_bindings_p (void);
571 extern tree pushdecl (tree);
572 extern void push_scope (void);
573 extern tree pop_scope (void);
574 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
575 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
577 extern void record_inline_static (location_t, tree, tree,
578 enum c_inline_static_type);
579 extern void c_init_decl_processing (void);
580 extern void c_print_identifier (FILE *, tree, int);
581 extern int quals_from_declspecs (const struct c_declspecs *);
582 extern struct c_declarator *build_array_declarator (location_t, tree,
583 struct c_declspecs *,
585 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
587 extern tree check_for_loop_decls (location_t, bool);
588 extern void mark_forward_parm_decls (void);
589 extern void declare_parm_level (void);
590 extern void undeclared_variable (location_t, tree);
591 extern tree lookup_label_for_goto (location_t, tree);
592 extern tree declare_label (tree);
593 extern tree define_label (location_t, tree);
594 extern struct c_spot_bindings *c_get_switch_bindings (void);
595 extern void c_release_switch_bindings (struct c_spot_bindings *);
596 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
597 location_t, location_t);
598 extern void finish_decl (tree, location_t, tree, tree, tree);
599 extern tree finish_enum (tree, tree, tree);
600 extern void finish_function (location_t = input_location);
601 extern tree finish_struct (location_t, tree, tree, tree,
602 class c_struct_parse_info *);
603 extern tree c_simulate_enum_decl (location_t, const char *,
604 vec<string_int_pair> *);
605 extern tree c_simulate_record_decl (location_t, const char *,
606 array_slice<const tree>);
607 extern struct c_arg_info *build_arg_info (void);
608 extern struct c_arg_info *get_parm_info (bool, tree);
609 extern tree grokfield (location_t, struct c_declarator *,
610 struct c_declspecs *, tree, tree *);
611 extern tree groktypename (struct c_type_name *, tree *, bool *);
612 extern tree grokparm (const struct c_parm *, tree *);
613 extern tree implicitly_declare (location_t, tree);
614 extern void keep_next_level (void);
615 extern void pending_xref_error (void);
616 extern void c_push_function_context (void);
617 extern void c_pop_function_context (void);
618 extern void push_parm_decl (const struct c_parm *, tree *);
619 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
620 struct c_declarator *);
621 extern tree c_builtin_function (tree);
622 extern tree c_builtin_function_ext_scope (tree);
623 extern tree c_simulate_builtin_function_decl (tree);
624 extern void c_warn_unused_attributes (tree);
625 extern tree c_warn_type_attributes (tree);
626 extern void shadow_tag (const struct c_declspecs *);
627 extern void shadow_tag_warned (const struct c_declspecs *, int);
628 extern tree start_enum (location_t, struct c_enum_contents *, tree);
629 extern bool start_function (struct c_declspecs *, struct c_declarator *, tree);
630 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
631 tree, location_t * = NULL);
632 extern tree start_struct (location_t, enum tree_code, tree,
633 class c_struct_parse_info **);
634 extern void store_parm_decls (void);
635 extern void store_parm_decls_from (struct c_arg_info *);
636 extern void temp_store_parm_decls (tree, tree);
637 extern void temp_pop_parm_decls (void);
638 extern tree xref_tag (enum tree_code, tree);
639 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree,
641 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
642 struct c_declarator *, location_t);
643 extern struct c_declarator *build_attrs_declarator (tree,
644 struct c_declarator *);
645 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
646 struct c_declarator *);
647 extern struct c_declarator *build_id_declarator (tree);
648 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
649 struct c_declarator *);
650 extern struct c_declspecs *build_null_declspecs (void);
651 extern struct c_declspecs *declspecs_add_qual (location_t,
652 struct c_declspecs *, tree);
653 extern struct c_declspecs *declspecs_add_type (location_t,
654 struct c_declspecs *,
656 extern struct c_declspecs *declspecs_add_scspec (location_t,
657 struct c_declspecs *, tree);
658 extern struct c_declspecs *declspecs_add_attrs (location_t,
659 struct c_declspecs *, tree);
660 extern struct c_declspecs *declspecs_add_addrspace (location_t,
661 struct c_declspecs *,
663 extern struct c_declspecs *declspecs_add_alignas (location_t,
664 struct c_declspecs *, tree);
665 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
667 /* in c-objc-common.cc */
668 extern bool c_objc_common_init (void);
669 extern bool c_missing_noreturn_ok_p (tree);
670 extern bool c_warn_unused_global_decl (const_tree);
671 extern void c_initialize_diagnostics (diagnostic_context *);
672 extern bool c_vla_unspec_p (tree x, tree fn);
673 extern alias_set_type c_get_alias_set (tree);
676 extern int in_alignof;
677 extern int in_sizeof;
678 extern int in_typeof;
679 extern bool c_in_omp_for;
681 extern tree c_last_sizeof_arg;
682 extern location_t c_last_sizeof_loc;
684 extern struct c_switch *c_switch_stack;
686 extern bool char_type_p (tree);
687 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
688 extern tree require_complete_type (location_t, tree);
689 extern bool same_translation_unit_p (const_tree, const_tree);
690 extern int comptypes (tree, tree);
691 extern int comptypes_check_different_types (tree, tree, bool *);
692 extern int comptypes_check_enum_int (tree, tree, bool *);
693 extern bool c_vla_type_p (const_tree);
694 extern bool c_mark_addressable (tree, bool = false);
695 extern void c_incomplete_type_error (location_t, const_tree, const_tree);
696 extern tree c_type_promotes_to (tree);
697 extern struct c_expr default_function_array_conversion (location_t,
699 extern struct c_expr default_function_array_read_conversion (location_t,
701 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
703 extern tree decl_constant_value_1 (tree, bool);
704 extern void mark_exp_read (tree);
705 extern tree composite_type (tree, tree);
706 extern tree build_component_ref (location_t, tree, tree, location_t,
708 extern tree build_array_ref (location_t, tree, tree);
709 extern tree build_external_ref (location_t, tree, bool, tree *);
710 extern void pop_maybe_used (bool);
711 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
712 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
713 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
715 extern struct c_expr parser_build_binary_op (location_t,
716 enum tree_code, struct c_expr,
718 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
719 location_t, tree, tree, location_t);
720 extern tree build_compound_expr (location_t, tree, tree);
721 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
722 extern tree build_c_cast (location_t, tree, tree);
723 extern void store_init_value (location_t, tree, tree, tree);
724 extern void maybe_warn_string_init (location_t, tree, struct c_expr);
725 extern void start_init (tree, tree, int, rich_location *);
726 extern void finish_init (void);
727 extern void really_start_incremental_init (tree);
728 extern void finish_implicit_inits (location_t, struct obstack *);
729 extern void push_init_level (location_t, int, struct obstack *);
730 extern struct c_expr pop_init_level (location_t, int, struct obstack *,
732 extern void set_init_index (location_t, tree, tree, struct obstack *);
733 extern void set_init_label (location_t, tree, location_t, struct obstack *);
734 extern void process_init_element (location_t, struct c_expr, bool,
736 extern tree build_compound_literal (location_t, tree, tree, bool,
737 unsigned int, struct c_declspecs *);
738 extern void check_compound_literal_type (location_t, struct c_type_name *);
739 extern tree c_start_switch (location_t, location_t, tree, bool);
740 extern void c_finish_switch (tree, tree);
741 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool,
743 extern tree build_asm_stmt (bool, tree);
744 extern int c_types_compatible_p (tree, tree);
745 extern tree c_begin_compound_stmt (bool);
746 extern tree c_end_compound_stmt (location_t, tree, bool);
747 extern void c_finish_if_stmt (location_t, tree, tree, tree);
748 extern void c_finish_loop (location_t, location_t, tree, location_t, tree,
749 tree, tree, tree, bool);
750 extern tree c_begin_stmt_expr (void);
751 extern tree c_finish_stmt_expr (location_t, tree);
752 extern tree c_process_expr_stmt (location_t, tree);
753 extern tree c_finish_expr_stmt (location_t, tree);
754 extern tree c_finish_return (location_t, tree, tree);
755 extern tree c_finish_bc_stmt (location_t, tree, bool);
756 extern tree c_finish_goto_label (location_t, tree);
757 extern tree c_finish_goto_ptr (location_t, c_expr val);
758 extern tree c_expr_to_decl (tree, bool *, bool *);
759 extern tree c_finish_omp_construct (location_t, enum tree_code, tree, tree);
760 extern tree c_finish_oacc_data (location_t, tree, tree);
761 extern tree c_finish_oacc_host_data (location_t, tree, tree);
762 extern tree c_begin_omp_parallel (void);
763 extern tree c_finish_omp_parallel (location_t, tree, tree);
764 extern tree c_begin_omp_task (void);
765 extern tree c_finish_omp_task (location_t, tree, tree);
766 extern void c_finish_omp_cancel (location_t, tree);
767 extern void c_finish_omp_cancellation_point (location_t, tree);
768 extern tree c_finish_omp_clauses (tree, enum c_omp_region_type);
769 extern tree c_build_va_arg (location_t, tree, location_t, tree);
770 extern tree c_finish_transaction (location_t, tree, int);
771 extern bool c_tree_equal (tree, tree);
772 extern tree c_build_function_call_vec (location_t, const vec<location_t>&,
773 tree, vec<tree, va_gc> *,
775 extern tree c_omp_clause_copy_ctor (tree, tree, tree);
777 /* Set to 0 at beginning of a function definition, set to 1 if
778 a return statement that specifies a return value is seen. */
780 extern int current_function_returns_value;
782 /* Set to 0 at beginning of a function definition, set to 1 if
783 a return statement with no argument is seen. */
785 extern int current_function_returns_null;
787 /* Set to 0 at beginning of a function definition, set to 1 if
788 a call to a noreturn function is seen. */
790 extern int current_function_returns_abnormally;
794 /* Tell the binding oracle what kind of binding we are looking for. */
796 enum c_oracle_request
803 /* If this is non-NULL, then it is a "binding oracle" which can lazily
804 create bindings when needed by the C compiler. The oracle is told
805 the name and type of the binding to create. It can call pushdecl
806 or the like to ensure the binding is visible; or do nothing,
807 leaving the binding untouched. c-decl.cc takes note of when the
808 oracle has been called and will not call it again if it fails to
809 create a given binding. */
811 typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier);
813 extern c_binding_oracle_function *c_binding_oracle;
815 extern void c_finish_incomplete_decl (tree);
816 extern tree c_omp_reduction_id (enum tree_code, tree);
817 extern tree c_omp_reduction_decl (tree);
818 extern tree c_omp_reduction_lookup (tree, tree);
819 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
820 extern bool c_check_in_current_scope (tree);
821 extern void c_pushtag (location_t, tree, tree);
822 extern void c_bind (location_t, tree, bool);
823 extern bool tag_exists_p (enum tree_code, tree);
826 extern bool pedwarn_c90 (location_t, int opt, const char *, ...)
827 ATTRIBUTE_GCC_DIAG(3,4);
828 extern bool pedwarn_c99 (location_t, int opt, const char *, ...)
829 ATTRIBUTE_GCC_DIAG(3,4);
830 extern bool pedwarn_c11 (location_t, int opt, const char *, ...)
831 ATTRIBUTE_GCC_DIAG(3,4);
834 set_c_expr_source_range (c_expr *expr,
835 location_t start, location_t finish);
838 set_c_expr_source_range (c_expr *expr,
839 source_range src_range);
842 extern vec<tree> incomplete_record_decls;
844 extern const char *c_get_sarif_source_language (const char *filename);
848 extern void run_c_tests (void);
849 } // namespace selftest
850 #endif /* #if CHECKING_P */
853 #endif /* ! GCC_C_TREE_H */