1/* Definitions for C parsing and type checking.
2 Copyright (C) 1987-2024 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.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 *))
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, nonzero if any component is
38 volatile, restrict-qualified or atomic; that is, has a type not
39 permitted for a constexpr object. */
40#define C_TYPE_FIELDS_NON_CONSTEXPR(TYPE) TREE_LANG_FLAG_4 (TYPE)
41
42/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
43 nonzero if the definition of the type has already started. */
44#define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
45
46/* In an incomplete RECORD_TYPE, UNION_TYPE or ENUMERAL_TYPE, a list of
47 variable declarations whose type would be completed by completing
48 that type. */
49#define C_TYPE_INCOMPLETE_VARS(TYPE) \
50 TYPE_LANG_SLOT_1 (TREE_CHECK4 (TYPE, RECORD_TYPE, UNION_TYPE, \
51 QUAL_UNION_TYPE, ENUMERAL_TYPE))
52
53/* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
54 keyword. C_RID_CODE (node) is then the RID_* value of the keyword. */
55#define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
56
57/* Record whether a type or decl was written with nonconstant size.
58 Note that TYPE_SIZE may have simplified to a constant. */
59#define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
60#define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
61
62/* Record whether a type is variably modified. */
63#define C_TYPE_VARIABLY_MODIFIED(TYPE) TYPE_LANG_FLAG_6 (TYPE)
64
65
66/* Record whether a type is defined inside a struct or union type.
67 This is used for -Wc++-compat. */
68#define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
69
70/* Record whether a typedef for type `int' was actually `signed int'. */
71#define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
72
73/* For a FUNCTION_DECL, nonzero if it was defined without an explicit
74 return type. */
75#define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
76
77/* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
78#define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
79
80/* For a PARM_DECL, nonzero if it was declared as an array. */
81#define C_ARRAY_PARAMETER(NODE) DECL_LANG_FLAG_0 (NODE)
82
83/* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
84 been declared. */
85#define C_DECL_DECLARED_BUILTIN(EXP) \
86 DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
87
88/* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
89 built-in prototype and does not have a non-built-in prototype. */
90#define C_DECL_BUILTIN_PROTOTYPE(EXP) \
91 DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
92
93/* Record whether a decl was declared register. This is strictly a
94 front-end flag, whereas DECL_REGISTER is used for code generation;
95 they may differ for structures with volatile fields. */
96#define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
97
98/* Record whether a decl was used in an expression anywhere except an
99 unevaluated operand of sizeof / typeof / alignof. This is only
100 used for functions declared static but not defined, though outside
101 sizeof and typeof it is set for other function decls as well. */
102#define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
103
104/* Record whether a variable has been declared threadprivate by
105 #pragma omp threadprivate. */
106#define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
107
108/* Set on VAR_DECLs for compound literals. */
109#define C_DECL_COMPOUND_LITERAL_P(DECL) \
110 DECL_LANG_FLAG_5 (VAR_DECL_CHECK (DECL))
111
112/* Set on decls used as placeholders for a C23 underspecified object
113 definition. */
114#define C_DECL_UNDERSPECIFIED(DECL) DECL_LANG_FLAG_7 (DECL)
115
116/* Set on VAR_DECLs declared as 'constexpr'. */
117#define C_DECL_DECLARED_CONSTEXPR(DECL) \
118 DECL_LANG_FLAG_8 (VAR_DECL_CHECK (DECL))
119
120/* Nonzero for a decl which either doesn't exist or isn't a prototype.
121 N.B. Could be simplified if all built-in decls had complete prototypes
122 (but this is presently difficult because some of them need FILE*). */
123#define C_DECL_ISNT_PROTOTYPE(EXP) \
124 (EXP == 0 \
125 || (!prototype_p (TREE_TYPE (EXP)) \
126 && !fndecl_built_in_p (EXP)))
127
128/* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
129 TYPE_ARG_TYPES for functions with prototypes, but created for functions
130 without prototypes. */
131#define TYPE_ACTUAL_ARG_TYPES(NODE) \
132 TYPE_LANG_SLOT_1 (FUNCTION_TYPE_CHECK (NODE))
133
134/* For a CONSTRUCTOR, whether some initializer contains a
135 subexpression meaning it is not a constant expression. */
136#define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
137
138/* For a SAVE_EXPR, nonzero if the operand of the SAVE_EXPR has already
139 been folded. */
140#define SAVE_EXPR_FOLDED_P(EXP) TREE_LANG_FLAG_1 (SAVE_EXPR_CHECK (EXP))
141
142/* Whether a type has boolean semantics: either a boolean type or an
143 enumeration type with a boolean type as its underlying type. */
144#define C_BOOLEAN_TYPE_P(TYPE) \
145 (TREE_CODE (TYPE) == BOOLEAN_TYPE \
146 || (TREE_CODE (TYPE) == ENUMERAL_TYPE \
147 && ENUM_UNDERLYING_TYPE (TYPE) != NULL_TREE \
148 && TREE_CODE (ENUM_UNDERLYING_TYPE (TYPE)) == BOOLEAN_TYPE))
149
150/* Record parser information about an expression that is irrelevant
151 for code generation alongside a tree representing its value. */
152struct c_expr
153{
154 /* The value of the expression. */
155 tree value;
156 /* Record the original unary/binary operator of an expression, which may
157 have been changed by fold, STRING_CST for unparenthesized string
158 constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
159 (even if parenthesized), for subexpressions, and for non-constant
160 initializers, or ERROR_MARK for other expressions (including
161 parenthesized expressions). */
162 enum tree_code original_code;
163 /* If not NULL, the original type of an expression. This will
164 differ from the type of the value field for an enum constant.
165 The type of an enum constant is a plain integer type, but this
166 field will be the enum type. */
167 tree original_type;
168
169 /* The source range of this expression. This is redundant
170 for node values that have locations, but not all node kinds
171 have locations (e.g. constants, and references to params, locals,
172 etc), so we stash a copy here. */
173 source_range src_range;
174
175 /* True if this was directly from a decimal constant token. */
176 bool m_decimal : 1;
177
178 /* Access to the first and last locations within the source spelling
179 of this expression. */
180 location_t get_start () const { return src_range.m_start; }
181 location_t get_finish () const { return src_range.m_finish; }
182
183 location_t get_location () const
184 {
185 if (EXPR_HAS_LOCATION (value))
186 return EXPR_LOCATION (value);
187 else
188 return make_location (caret: get_start (), start: get_start (), finish: get_finish ());
189 }
190
191 /* Set the value to error_mark_node whilst ensuring that src_range
192 and m_decimal are initialized. */
193 void set_error ()
194 {
195 value = error_mark_node;
196 src_range.m_start = UNKNOWN_LOCATION;
197 src_range.m_finish = UNKNOWN_LOCATION;
198 m_decimal = 0;
199 }
200};
201
202/* Type alias for struct c_expr. This allows to use the structure
203 inside the VEC types. */
204typedef struct c_expr c_expr_t;
205
206/* A kind of type specifier. Note that this information is currently
207 only used to distinguish tag definitions, tag references and typeof
208 uses. */
209enum c_typespec_kind {
210 /* No typespec. This appears only in struct c_declspec. */
211 ctsk_none,
212 /* A reserved keyword type specifier. */
213 ctsk_resword,
214 /* A reference to a tag, previously declared, such as "struct foo".
215 This includes where the previous declaration was as a different
216 kind of tag, in which case this is only valid if shadowing that
217 tag in an inner scope. */
218 ctsk_tagref,
219 /* Likewise, with standard attributes present in the reference. */
220 ctsk_tagref_attrs,
221 /* A reference to a tag, not previously declared in a visible
222 scope. */
223 ctsk_tagfirstref,
224 /* Likewise, with standard attributes present in the reference. */
225 ctsk_tagfirstref_attrs,
226 /* A definition of a tag such as "struct foo { int a; }". */
227 ctsk_tagdef,
228 /* A typedef name. */
229 ctsk_typedef,
230 /* An ObjC-specific kind of type specifier. */
231 ctsk_objc,
232 /* A typeof specifier, or _Atomic ( type-name ). */
233 ctsk_typeof
234};
235
236/* A type specifier: this structure is created in the parser and
237 passed to declspecs_add_type only. */
238struct c_typespec {
239 /* What kind of type specifier this is. */
240 enum c_typespec_kind kind;
241 /* Whether the expression has operands suitable for use in constant
242 expressions. */
243 bool expr_const_operands;
244 /* Whether the type specifier includes an enum type specifier (that
245 is, ": specifier-qualifier-list" in a declaration using
246 "enum"). */
247 bool has_enum_type_specifier;
248 /* The specifier itself. */
249 tree spec;
250 /* An expression to be evaluated before the type specifier, in the
251 case of typeof specifiers, or NULL otherwise or if no such
252 expression is required for a particular typeof specifier. In
253 particular, when typeof is applied to an expression of variably
254 modified type, that expression must be evaluated in order to
255 determine array sizes that form part of the type, but the
256 expression itself (as opposed to the array sizes) forms no part
257 of the type and so needs to be recorded separately. */
258 tree expr;
259};
260
261/* A storage class specifier. */
262enum c_storage_class {
263 csc_none,
264 csc_auto,
265 csc_extern,
266 csc_register,
267 csc_static,
268 csc_typedef
269};
270
271/* A type specifier keyword "void", "_Bool", "char", "int", "float",
272 "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
273 "_BitInt", or none of these. */
274enum c_typespec_keyword {
275 cts_none,
276 cts_void,
277 cts_bool,
278 cts_char,
279 cts_int,
280 cts_float,
281 cts_int_n,
282 cts_double,
283 cts_dfloat32,
284 cts_dfloat64,
285 cts_dfloat128,
286 cts_floatn_nx,
287 cts_fract,
288 cts_accum,
289 cts_bitint,
290 cts_auto_type
291};
292
293/* This enum lists all the possible declarator specifiers, storage
294 class or attribute that a user can write. There is at least one
295 enumerator per possible declarator specifier in the struct
296 c_declspecs below.
297
298 It is used to index the array of declspec locations in struct
299 c_declspecs. */
300enum c_declspec_word {
301 cdw_typespec /* A catch-all for a typespec. */,
302 cdw_storage_class /* A catch-all for a storage class */,
303 cdw_attributes,
304 cdw_typedef,
305 cdw_explicit_signed,
306 cdw_deprecated,
307 cdw_default_int,
308 cdw_long,
309 cdw_long_long,
310 cdw_short,
311 cdw_signed,
312 cdw_unsigned,
313 cdw_complex,
314 cdw_inline,
315 cdw_noreturn,
316 cdw_thread,
317 cdw_const,
318 cdw_volatile,
319 cdw_restrict,
320 cdw_atomic,
321 cdw_saturating,
322 cdw_alignas,
323 cdw_address_space,
324 cdw_gimple,
325 cdw_rtl,
326 cdw_number_of_elements /* This one must always be the last
327 enumerator. */
328};
329
330enum c_declspec_il {
331 cdil_none,
332 cdil_gimple, /* __GIMPLE */
333 cdil_gimple_cfg, /* __GIMPLE(cfg) */
334 cdil_gimple_ssa, /* __GIMPLE(ssa) */
335 cdil_rtl /* __RTL */
336};
337
338/* A sequence of declaration specifiers in C. When a new declaration
339 specifier is added, please update the enum c_declspec_word above
340 accordingly. */
341struct c_declspecs {
342 location_t locations[cdw_number_of_elements];
343 /* The type specified, if a single type specifier such as a struct,
344 union or enum specifier, typedef name or typeof specifies the
345 whole type, or NULL_TREE if none or a keyword such as "void" or
346 "char" is used. Does not include qualifiers. */
347 tree type;
348 /* Any expression to be evaluated before the type, from a typeof
349 specifier. */
350 tree expr;
351 /* The attributes from a typedef decl. */
352 tree decl_attr;
353 /* When parsing, the GNU attributes and prefix standard attributes.
354 Outside the parser, this will be NULL; attributes (possibly from
355 multiple lists) will be passed separately. */
356 tree attrs;
357 /* When parsing, postfix standard attributes (which appertain to the
358 type specified by the preceding declaration specifiers, unlike
359 prefix standard attributes which appertain to the declaration or
360 declarations as a whole). */
361 tree postfix_attrs;
362 /* The pass to start compiling a __GIMPLE or __RTL function with. */
363 char *gimple_or_rtl_pass;
364 /* ENTRY BB count. */
365 profile_count entry_bb_count;
366 /* The base-2 log of the greatest alignment required by an _Alignas
367 specifier, in bytes, or -1 if no such specifiers with nonzero
368 alignment. */
369 int align_log;
370 union {
371 /* For the __intN declspec, this stores the index into the int_n_*
372 arrays. */
373 int int_n_idx;
374 /* For the _FloatN and _FloatNx declspec, this stores the index into
375 the floatn_nx_types array. */
376 int floatn_nx_idx;
377 /* For _BitInt(N) this stores the N. */
378 int bitint_prec;
379 } u;
380 /* The storage class specifier, or csc_none if none. */
381 enum c_storage_class storage_class;
382 /* Any type specifier keyword used such as "int", not reflecting
383 modifiers such as "short", or cts_none if none. */
384 ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
385 /* The kind of type specifier if one has been seen, ctsk_none
386 otherwise. */
387 ENUM_BITFIELD (c_typespec_kind) typespec_kind : 4;
388 ENUM_BITFIELD (c_declspec_il) declspec_il : 3;
389 /* Whether any expressions in typeof specifiers may appear in
390 constant expressions. */
391 BOOL_BITFIELD expr_const_operands : 1;
392 /* Whether any declaration specifiers have been seen at all. */
393 BOOL_BITFIELD declspecs_seen_p : 1;
394 /* Whether any declaration specifiers other than standard attributes
395 have been seen at all. If only standard attributes have been
396 seen, this is an attribute-declaration. */
397 BOOL_BITFIELD non_std_attrs_seen_p : 1;
398 /* Whether something other than a storage class specifier or
399 attribute has been seen. This is used to warn for the
400 obsolescent usage of storage class specifiers other than at the
401 start of the list. (Doing this properly would require function
402 specifiers to be handled separately from storage class
403 specifiers.) */
404 BOOL_BITFIELD non_sc_seen_p : 1;
405 /* Whether the type is specified by a typedef or typeof name. */
406 BOOL_BITFIELD typedef_p : 1;
407 /* Whether the type is explicitly "signed" or specified by a typedef
408 whose type is explicitly "signed". */
409 BOOL_BITFIELD explicit_signed_p : 1;
410 /* Whether the specifiers include a deprecated typedef. */
411 BOOL_BITFIELD deprecated_p : 1;
412 /* Whether the specifiers include an unavailable typedef. */
413 BOOL_BITFIELD unavailable_p : 1;
414 /* Whether the type defaulted to "int" because there were no type
415 specifiers. */
416 BOOL_BITFIELD default_int_p : 1;
417 /* Whether "long" was specified. */
418 BOOL_BITFIELD long_p : 1;
419 /* Whether "long" was specified more than once. */
420 BOOL_BITFIELD long_long_p : 1;
421 /* Whether "short" was specified. */
422 BOOL_BITFIELD short_p : 1;
423 /* Whether "signed" was specified. */
424 BOOL_BITFIELD signed_p : 1;
425 /* Whether "unsigned" was specified. */
426 BOOL_BITFIELD unsigned_p : 1;
427 /* Whether "complex" was specified. */
428 BOOL_BITFIELD complex_p : 1;
429 /* Whether "inline" was specified. */
430 BOOL_BITFIELD inline_p : 1;
431 /* Whether "_Noreturn" was speciied. */
432 BOOL_BITFIELD noreturn_p : 1;
433 /* Whether "__thread" or "_Thread_local" was specified. */
434 BOOL_BITFIELD thread_p : 1;
435 /* Whether "__thread" rather than "_Thread_local" was specified. */
436 BOOL_BITFIELD thread_gnu_p : 1;
437 /* Whether "const" was specified. */
438 BOOL_BITFIELD const_p : 1;
439 /* Whether "volatile" was specified. */
440 BOOL_BITFIELD volatile_p : 1;
441 /* Whether "restrict" was specified. */
442 BOOL_BITFIELD restrict_p : 1;
443 /* Whether "_Atomic" was specified. */
444 BOOL_BITFIELD atomic_p : 1;
445 /* Whether "_Sat" was specified. */
446 BOOL_BITFIELD saturating_p : 1;
447 /* Whether any alignment specifier (even with zero alignment) was
448 specified. */
449 BOOL_BITFIELD alignas_p : 1;
450 /* Whether an enum type specifier (": specifier-qualifier-list") was
451 specified other than in a definition of that enum (if so, this is
452 invalid unless it is an empty declaration "enum identifier
453 enum-type-specifier;", but such an empty declaration is valid in
454 C23 when "enum identifier;" would not be). */
455 BOOL_BITFIELD enum_type_specifier_ref_p : 1;
456 /* Whether "auto" was specified in C23 (or later) mode and means the
457 type is to be deduced from an initializer, or would mean that if
458 no type specifier appears later in these declaration
459 specifiers. */
460 BOOL_BITFIELD c23_auto_p : 1;
461 /* Whether "constexpr" was specified. */
462 BOOL_BITFIELD constexpr_p : 1;
463 /* The address space that the declaration belongs to. */
464 addr_space_t address_space;
465};
466
467/* The various kinds of declarators in C. */
468enum c_declarator_kind {
469 /* An identifier. */
470 cdk_id,
471 /* A function. */
472 cdk_function,
473 /* An array. */
474 cdk_array,
475 /* A pointer. */
476 cdk_pointer,
477 /* Parenthesized declarator with nested attributes. */
478 cdk_attrs
479};
480
481struct c_arg_tag {
482 /* The argument name. */
483 tree id;
484 /* The type of the argument. */
485 tree type;
486};
487
488
489/* Information about the parameters in a function declarator. */
490struct c_arg_info {
491 /* A list of parameter decls. */
492 tree parms;
493 /* A list of structure, union and enum tags defined. */
494 vec<c_arg_tag, va_gc> *tags;
495 /* A list of argument types to go in the FUNCTION_TYPE. */
496 tree types;
497 /* A list of non-parameter decls (notably enumeration constants)
498 defined with the parameters. */
499 tree others;
500 /* A compound expression of VLA sizes from the parameters, or NULL.
501 In a function definition, these are used to ensure that
502 side-effects in sizes of arrays converted to pointers (such as a
503 parameter int i[n++]) take place; otherwise, they are
504 ignored. */
505 tree pending_sizes;
506 /* True when these arguments had [*]. */
507 BOOL_BITFIELD had_vla_unspec : 1;
508 /* True when the arguments are a (...) prototype. */
509 BOOL_BITFIELD no_named_args_stdarg_p : 1;
510};
511
512/* A declarator. */
513struct c_declarator {
514 /* The kind of declarator. */
515 enum c_declarator_kind kind;
516 location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
517 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */
518 struct c_declarator *declarator;
519 union {
520 /* For identifiers. */
521 struct {
522 /* An IDENTIFIER_NODE, or NULL_TREE if an abstract
523 declarator. */
524 tree id;
525 /* Any attributes (which apply to the declaration rather than to
526 the type described by the outer declarators). */
527 tree attrs;
528 } id;
529 /* For functions. */
530 struct c_arg_info *arg_info;
531 /* For arrays. */
532 struct {
533 /* The array dimension, or NULL for [] and [*]. */
534 tree dimen;
535 /* The qualifiers inside []. */
536 int quals;
537 /* The attributes (currently ignored) inside []. */
538 tree attrs;
539 /* Whether [static] was used. */
540 BOOL_BITFIELD static_p : 1;
541 /* Whether [*] was used. */
542 BOOL_BITFIELD vla_unspec_p : 1;
543 } array;
544 /* For pointers, the qualifiers on the pointer type. */
545 int pointer_quals;
546 /* For attributes. */
547 tree attrs;
548 } u;
549};
550
551/* A type name. */
552struct c_type_name {
553 /* The declaration specifiers. */
554 struct c_declspecs *specs;
555 /* The declarator. */
556 struct c_declarator *declarator;
557};
558
559/* A parameter. */
560struct c_parm {
561 /* The declaration specifiers, minus any prefix attributes. */
562 struct c_declspecs *specs;
563 /* The attributes. */
564 tree attrs;
565 /* The declarator. */
566 struct c_declarator *declarator;
567 /* The location of the parameter. */
568 location_t loc;
569};
570
571/* Used when parsing an enum. Initialized by start_enum. */
572struct c_enum_contents
573{
574 /* While defining an enum type, this is 1 plus the last enumerator
575 constant value. */
576 tree enum_next_value;
577
578 /* The enumeration type itself. */
579 tree enum_type;
580
581 /* Nonzero means that there was overflow computing enum_next_value. */
582 int enum_overflow;
583};
584
585/* A type of reference to a static identifier in an inline
586 function. */
587enum c_inline_static_type {
588 /* Identifier with internal linkage used in function that may be an
589 inline definition (i.e., file-scope static). */
590 csi_internal,
591 /* Modifiable object with static storage duration defined in
592 function that may be an inline definition (i.e., local
593 static). */
594 csi_modifiable
595};
596
597
598/* in c-parser.cc */
599struct c_tree_token_vec;
600extern void c_parse_init (void);
601extern bool c_keyword_starts_typename (enum rid keyword);
602
603/* in c-aux-info.cc */
604extern void gen_aux_info_record (tree, int, int, int);
605
606/* in c-decl.cc */
607struct c_spot_bindings;
608class c_struct_parse_info;
609extern struct obstack parser_obstack;
610/* Set to IN_ITERATION_STMT if parsing an iteration-statement,
611 to IN_OMP_BLOCK if parsing OpenMP structured block and
612 IN_OMP_FOR if parsing OpenMP loop. If parsing a switch statement,
613 this is bitwise ORed with IN_SWITCH_STMT, unless parsing an
614 iteration-statement, OpenMP block or loop within that switch. */
615#define IN_SWITCH_STMT 1
616#define IN_ITERATION_STMT 2
617#define IN_OMP_BLOCK 4
618#define IN_OMP_FOR 8
619#define IN_OBJC_FOREACH 16
620extern unsigned char in_statement;
621
622extern bool switch_statement_break_seen_p;
623
624extern bool global_bindings_p (void);
625extern tree pushdecl (tree);
626extern unsigned int start_underspecified_init (location_t, tree);
627extern void finish_underspecified_init (tree, unsigned int);
628extern void push_scope (void);
629extern tree pop_scope (void);
630extern void c_mark_decl_jump_unsafe_in_current_scope ();
631extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
632extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
633
634extern void record_inline_static (location_t, tree, tree,
635 enum c_inline_static_type);
636extern void c_init_decl_processing (void);
637extern void c_print_identifier (FILE *, tree, int);
638extern int quals_from_declspecs (const struct c_declspecs *);
639extern struct c_declarator *build_array_declarator (location_t, tree,
640 struct c_declspecs *,
641 bool, bool);
642extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
643 tree, tree);
644extern tree check_for_loop_decls (location_t, bool);
645extern void mark_forward_parm_decls (void);
646extern void declare_parm_level (void);
647extern void undeclared_variable (location_t, tree);
648extern tree lookup_label_for_goto (location_t, tree);
649extern tree declare_label (tree);
650extern tree define_label (location_t, tree);
651extern struct c_spot_bindings *c_get_switch_bindings (void);
652extern void c_release_switch_bindings (struct c_spot_bindings *);
653extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
654 location_t, location_t);
655extern void finish_decl (tree, location_t, tree, tree, tree);
656extern tree finish_enum (tree, tree, tree);
657extern void finish_function (location_t = input_location);
658extern tree finish_struct (location_t, tree, tree, tree,
659 class c_struct_parse_info *,
660 tree *expr = NULL);
661extern tree c_simulate_enum_decl (location_t, const char *,
662 vec<string_int_pair> *);
663extern tree c_simulate_record_decl (location_t, const char *,
664 array_slice<const tree>);
665extern struct c_arg_info *build_arg_info (void);
666extern struct c_arg_info *get_parm_info (bool, tree);
667extern tree grokfield (location_t, struct c_declarator *,
668 struct c_declspecs *, tree, tree *, tree *);
669extern tree groktypename (struct c_type_name *, tree *, bool *);
670extern tree grokparm (const struct c_parm *, tree *);
671extern tree implicitly_declare (location_t, tree);
672extern void keep_next_level (void);
673extern void pending_xref_error (void);
674extern void c_push_function_context (void);
675extern void c_pop_function_context (void);
676extern void push_parm_decl (const struct c_parm *, tree *);
677extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
678 struct c_declarator *);
679extern tree c_builtin_function (tree);
680extern tree c_builtin_function_ext_scope (tree);
681extern tree c_simulate_builtin_function_decl (tree);
682extern void c_warn_unused_attributes (tree);
683extern tree c_warn_type_attributes (tree);
684extern void shadow_tag (const struct c_declspecs *);
685extern void shadow_tag_warned (const struct c_declspecs *, int);
686extern tree start_enum (location_t, struct c_enum_contents *, tree, tree,
687 bool potential_nesting_p);
688extern bool start_function (struct c_declspecs *, struct c_declarator *, tree);
689extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
690 tree, bool = true, location_t * = NULL);
691extern tree start_struct (location_t, enum tree_code, tree,
692 class c_struct_parse_info **);
693extern void store_parm_decls (void);
694extern void store_parm_decls_from (struct c_arg_info *);
695extern void temp_store_parm_decls (tree, tree);
696extern void temp_pop_parm_decls (void);
697extern tree xref_tag (enum tree_code, tree);
698extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree,
699 bool, tree, bool);
700extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
701 struct c_declarator *, location_t);
702extern struct c_declarator *build_attrs_declarator (tree,
703 struct c_declarator *);
704extern struct c_declarator *build_function_declarator (struct c_arg_info *,
705 struct c_declarator *);
706extern struct c_declarator *build_id_declarator (tree);
707extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
708 struct c_declarator *);
709extern struct c_declspecs *build_null_declspecs (void);
710extern struct c_declspecs *declspecs_add_qual (location_t,
711 struct c_declspecs *, tree);
712extern struct c_declspecs *declspecs_add_type (location_t,
713 struct c_declspecs *,
714 struct c_typespec);
715extern struct c_declspecs *declspecs_add_scspec (location_t,
716 struct c_declspecs *, tree);
717extern struct c_declspecs *declspecs_add_attrs (location_t,
718 struct c_declspecs *, tree);
719extern struct c_declspecs *declspecs_add_addrspace (location_t,
720 struct c_declspecs *,
721 addr_space_t);
722extern struct c_declspecs *declspecs_add_alignas (location_t,
723 struct c_declspecs *, tree);
724extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
725extern size_t c_tree_size (enum tree_code);
726
727/* in c-objc-common.cc */
728extern bool c_objc_common_init (void);
729extern bool c_missing_noreturn_ok_p (tree);
730extern bool c_warn_unused_global_decl (const_tree);
731extern void c_initialize_diagnostics (diagnostic_context *);
732extern bool c_var_mod_p (tree x, tree fn);
733extern alias_set_type c_get_alias_set (tree);
734extern int c_type_dwarf_attribute (const_tree, int);
735
736/* in c-typeck.cc */
737extern int in_alignof;
738extern int in_sizeof;
739extern int in_typeof;
740extern bool c_in_omp_for;
741extern bool c_omp_array_section_p;
742
743extern tree c_last_sizeof_arg;
744extern location_t c_last_sizeof_loc;
745
746extern struct c_switch *c_switch_stack;
747
748extern bool null_pointer_constant_p (const_tree);
749
750
751inline
752bool c_type_variably_modified_p (tree t)
753{
754 return error_mark_node != t && C_TYPE_VARIABLY_MODIFIED (t);
755}
756
757
758extern bool char_type_p (tree);
759extern tree c_objc_common_truthvalue_conversion (location_t, tree,
760 tree = integer_type_node);
761extern tree require_complete_type (location_t, tree);
762extern bool same_translation_unit_p (const_tree, const_tree);
763extern int comptypes (tree, tree);
764extern bool comptypes_same_p (tree, tree);
765extern bool comptypes_equiv_p (tree, tree);
766extern int comptypes_check_different_types (tree, tree, bool *);
767extern int comptypes_check_enum_int (tree, tree, bool *);
768extern bool c_mark_addressable (tree, bool = false);
769extern void c_incomplete_type_error (location_t, const_tree, const_tree);
770extern tree c_type_promotes_to (tree);
771extern struct c_expr default_function_array_conversion (location_t,
772 struct c_expr);
773extern struct c_expr default_function_array_read_conversion (location_t,
774 struct c_expr);
775extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
776 bool, bool, bool = false);
777extern tree decl_constant_value_1 (tree, bool);
778extern void mark_exp_read (tree);
779extern tree composite_type (tree, tree);
780extern tree build_component_ref (location_t, tree, tree, location_t,
781 location_t);
782extern tree build_array_ref (location_t, tree, tree);
783extern tree build_omp_array_section (location_t, tree, tree, tree);
784extern tree build_external_ref (location_t, tree, bool, tree *);
785extern void pop_maybe_used (bool);
786extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
787extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
788extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
789 struct c_expr);
790extern struct c_expr parser_build_binary_op (location_t,
791 enum tree_code, struct c_expr,
792 struct c_expr);
793extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
794 location_t, tree, tree, location_t);
795extern tree build_compound_expr (location_t, tree, tree);
796extern tree c_cast_expr (location_t, struct c_type_name *, tree);
797extern tree build_c_cast (location_t, tree, tree);
798extern void store_init_value (location_t, tree, tree, tree);
799extern void maybe_warn_string_init (location_t, tree, struct c_expr);
800extern void start_init (tree, tree, bool, bool, rich_location *);
801extern void finish_init (void);
802extern void really_start_incremental_init (tree);
803extern void finish_implicit_inits (location_t, struct obstack *);
804extern void push_init_level (location_t, int, struct obstack *);
805extern struct c_expr pop_init_level (location_t, int, struct obstack *,
806 location_t);
807extern void set_init_index (location_t, tree, tree, struct obstack *);
808extern void set_init_label (location_t, tree, location_t, struct obstack *);
809extern void process_init_element (location_t, struct c_expr, bool,
810 struct obstack *);
811extern tree build_compound_literal (location_t, tree, tree, bool,
812 unsigned int, struct c_declspecs *);
813extern void check_compound_literal_type (location_t, struct c_type_name *);
814extern tree c_start_switch (location_t, location_t, tree, bool);
815extern void c_finish_switch (tree, tree);
816extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool,
817 bool);
818extern tree build_asm_stmt (bool, tree);
819extern int c_types_compatible_p (tree, tree);
820extern tree c_begin_compound_stmt (bool);
821extern tree c_end_compound_stmt (location_t, tree, bool);
822extern void c_finish_if_stmt (location_t, tree, tree, tree);
823extern void c_finish_loop (location_t, location_t, tree, location_t, tree,
824 tree, tree, tree, bool);
825extern tree c_begin_stmt_expr (void);
826extern tree c_finish_stmt_expr (location_t, tree);
827extern tree c_process_expr_stmt (location_t, tree);
828extern tree c_finish_expr_stmt (location_t, tree);
829extern tree c_finish_return (location_t, tree, tree);
830extern tree c_finish_bc_stmt (location_t, tree, bool);
831extern tree c_finish_goto_label (location_t, tree);
832extern tree c_finish_goto_ptr (location_t, c_expr val);
833extern tree c_expr_to_decl (tree, bool *, bool *);
834extern tree c_finish_omp_construct (location_t, enum tree_code, tree, tree);
835extern tree c_finish_oacc_data (location_t, tree, tree);
836extern tree c_finish_oacc_host_data (location_t, tree, tree);
837extern tree c_begin_omp_parallel (void);
838extern tree c_finish_omp_parallel (location_t, tree, tree);
839extern tree c_begin_omp_task (void);
840extern tree c_finish_omp_task (location_t, tree, tree);
841extern void c_finish_omp_cancel (location_t, tree);
842extern void c_finish_omp_cancellation_point (location_t, tree);
843extern tree c_finish_omp_clauses (tree, enum c_omp_region_type);
844extern tree c_build_va_arg (location_t, tree, location_t, tree);
845extern tree c_finish_transaction (location_t, tree, int);
846extern bool c_tree_equal (tree, tree);
847extern tree c_build_function_call_vec (location_t, const vec<location_t>&,
848 tree, vec<tree, va_gc> *,
849 vec<tree, va_gc> *);
850extern tree c_omp_clause_copy_ctor (tree, tree, tree);
851
852/* Set to 0 at beginning of a function definition, set to 1 if
853 a return statement that specifies a return value is seen. */
854
855extern int current_function_returns_value;
856
857/* Set to 0 at beginning of a function definition, set to 1 if
858 a return statement with no argument is seen. */
859
860extern int current_function_returns_null;
861
862/* Set to 0 at beginning of a function definition, set to 1 if
863 a call to a noreturn function is seen. */
864
865extern int current_function_returns_abnormally;
866
867/* In c-decl.cc */
868
869/* Tell the binding oracle what kind of binding we are looking for. */
870
871enum c_oracle_request
872{
873 C_ORACLE_SYMBOL,
874 C_ORACLE_TAG,
875 C_ORACLE_LABEL
876};
877
878/* If this is non-NULL, then it is a "binding oracle" which can lazily
879 create bindings when needed by the C compiler. The oracle is told
880 the name and type of the binding to create. It can call pushdecl
881 or the like to ensure the binding is visible; or do nothing,
882 leaving the binding untouched. c-decl.cc takes note of when the
883 oracle has been called and will not call it again if it fails to
884 create a given binding. */
885
886typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier);
887
888extern c_binding_oracle_function *c_binding_oracle;
889
890extern void c_finish_incomplete_decl (tree);
891extern tree c_omp_reduction_id (enum tree_code, tree);
892extern tree c_omp_reduction_decl (tree);
893extern tree c_omp_reduction_lookup (tree, tree);
894extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
895extern bool c_check_in_current_scope (tree);
896extern void c_pushtag (location_t, tree, tree);
897extern void c_bind (location_t, tree, bool);
898extern bool tag_exists_p (enum tree_code, tree);
899
900/* In c-errors.cc */
901extern bool pedwarn_c90 (location_t, int opt, const char *, ...)
902 ATTRIBUTE_GCC_DIAG(3,4);
903extern bool pedwarn_c99 (location_t, int opt, const char *, ...)
904 ATTRIBUTE_GCC_DIAG(3,4);
905extern bool pedwarn_c11 (location_t, int opt, const char *, ...)
906 ATTRIBUTE_GCC_DIAG(3,4);
907
908extern void
909set_c_expr_source_range (c_expr *expr,
910 location_t start, location_t finish);
911
912extern void
913set_c_expr_source_range (c_expr *expr,
914 source_range src_range);
915
916/* In c-fold.cc */
917extern vec<tree> incomplete_record_decls;
918
919extern const char *c_get_sarif_source_language (const char *filename);
920
921extern const struct scoped_attribute_specs std_attribute_table;
922
923#if CHECKING_P
924namespace selftest {
925 extern void run_c_tests (void);
926} // namespace selftest
927#endif /* #if CHECKING_P */
928
929
930#endif /* ! GCC_C_TREE_H */
931

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source code of gcc/c/c-tree.h