1 /* Definitions for C parsing and type checking. 2 Copyright (C) 1987-2024 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 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 9 version. 10 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 14 for more details. 15 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/>. */ 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. */ 152 struct 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 (get_start (), get_start (), 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. */ 204 typedef 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. */ 209 enum 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. */ 238 struct 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. */ 262 enum 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. */ 274 enum 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. */ 300 enum 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 }; 329 330 enum 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. */ 341 struct 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. */ 468 enum 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 }; 480 481 struct 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. */ 490 struct 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. */ 513 struct 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. */ 552 struct 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. */ 560 struct 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. */ 572 struct 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. */ 587 enum 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 */ 600 struct c_tree_token_vec; 601 extern void c_parse_init (void); 602 extern bool c_keyword_starts_typename (enum rid keyword); 603 604 /* in c-aux-info.cc */ 605 extern void gen_aux_info_record (tree, int, int, int); 606 607 /* in c-decl.cc */ 608 struct c_spot_bindings; 609 class c_struct_parse_info; 610 extern struct obstack parser_obstack; 611 /* Set to IN_ITERATION_STMT if parsing an iteration-statement, 612 to IN_OMP_BLOCK if parsing OpenMP structured block and 613 IN_OMP_FOR if parsing OpenMP loop. If parsing a switch statement, 614 this is bitwise ORed with IN_SWITCH_STMT, unless parsing an 615 iteration-statement, OpenMP block or loop within that switch. */ 616 #define IN_SWITCH_STMT 1 617 #define IN_ITERATION_STMT 2 618 #define IN_OMP_BLOCK 4 619 #define IN_OMP_FOR 8 620 #define IN_OBJC_FOREACH 16 621 extern unsigned char in_statement; 622 623 extern bool switch_statement_break_seen_p; 624 625 extern bool global_bindings_p (void); 626 extern tree pushdecl (tree); 627 extern unsigned int start_underspecified_init (location_t, tree); 628 extern void finish_underspecified_init (tree, unsigned int); 629 extern void push_scope (void); 630 extern tree pop_scope (void); 631 extern void c_mark_decl_jump_unsafe_in_current_scope (); 632 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *); 633 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *); 634 635 extern void record_inline_static (location_t, tree, tree, 636 enum c_inline_static_type); 637 extern void c_init_decl_processing (void); 638 extern void c_print_identifier (FILE *, tree, int); 639 extern int quals_from_declspecs (const struct c_declspecs *); 640 extern struct c_declarator *build_array_declarator (location_t, tree, 641 struct c_declspecs *, 642 bool, bool); 643 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *, 644 tree, tree); 645 extern tree check_for_loop_decls (location_t, bool); 646 extern void mark_forward_parm_decls (void); 647 extern void declare_parm_level (void); 648 extern void undeclared_variable (location_t, tree); 649 extern tree lookup_label_for_goto (location_t, tree); 650 extern tree declare_label (tree); 651 extern tree define_label (location_t, tree); 652 extern struct c_spot_bindings *c_get_switch_bindings (void); 653 extern void c_release_switch_bindings (struct c_spot_bindings *); 654 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *, 655 location_t, location_t); 656 extern void finish_decl (tree, location_t, tree, tree, tree); 657 extern tree finish_enum (tree, tree, tree); 658 extern void finish_function (location_t = input_location); 659 extern tree finish_struct (location_t, tree, tree, tree, 660 class c_struct_parse_info *, 661 tree *expr = NULL); 662 extern tree c_simulate_enum_decl (location_t, const char *, 663 vec<string_int_pair> *); 664 extern tree c_simulate_record_decl (location_t, const char *, 665 array_slice<const tree>); 666 extern struct c_arg_info *build_arg_info (void); 667 extern struct c_arg_info *get_parm_info (bool, tree); 668 extern tree grokfield (location_t, struct c_declarator *, 669 struct c_declspecs *, tree, tree *, tree *); 670 extern tree groktypename (struct c_type_name *, tree *, bool *); 671 extern tree grokparm (const struct c_parm *, tree *); 672 extern tree implicitly_declare (location_t, tree); 673 extern void keep_next_level (void); 674 extern void pending_xref_error (void); 675 extern void c_push_function_context (void); 676 extern void c_pop_function_context (void); 677 extern void push_parm_decl (const struct c_parm *, tree *); 678 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *, 679 struct c_declarator *); 680 extern tree c_builtin_function (tree); 681 extern tree c_builtin_function_ext_scope (tree); 682 extern tree c_simulate_builtin_function_decl (tree); 683 extern void c_warn_unused_attributes (tree); 684 extern tree c_warn_type_attributes (tree); 685 extern void shadow_tag (const struct c_declspecs *); 686 extern void shadow_tag_warned (const struct c_declspecs *, int); 687 extern tree start_enum (location_t, struct c_enum_contents *, tree, tree, 688 bool potential_nesting_p); 689 extern bool start_function (struct c_declspecs *, struct c_declarator *, tree); 690 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool, 691 tree, bool = true, location_t * = NULL); 692 extern tree start_struct (location_t, enum tree_code, tree, 693 class c_struct_parse_info **); 694 extern void store_parm_decls (void); 695 extern void store_parm_decls_from (struct c_arg_info *); 696 extern void temp_store_parm_decls (tree, tree); 697 extern void temp_pop_parm_decls (void); 698 extern tree xref_tag (enum tree_code, tree); 699 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree, 700 bool, tree, bool); 701 extern struct c_parm *build_c_parm (struct c_declspecs *, tree, 702 struct c_declarator *, location_t); 703 extern struct c_declarator *build_attrs_declarator (tree, 704 struct c_declarator *); 705 extern struct c_declarator *build_function_declarator (struct c_arg_info *, 706 struct c_declarator *); 707 extern struct c_declarator *build_id_declarator (tree); 708 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *, 709 struct c_declarator *); 710 extern struct c_declspecs *build_null_declspecs (void); 711 extern struct c_declspecs *declspecs_add_qual (location_t, 712 struct c_declspecs *, tree); 713 extern struct c_declspecs *declspecs_add_type (location_t, 714 struct c_declspecs *, 715 struct c_typespec); 716 extern struct c_declspecs *declspecs_add_scspec (location_t, 717 struct c_declspecs *, tree); 718 extern struct c_declspecs *declspecs_add_attrs (location_t, 719 struct c_declspecs *, tree); 720 extern struct c_declspecs *declspecs_add_addrspace (location_t, 721 struct c_declspecs *, 722 addr_space_t); 723 extern struct c_declspecs *declspecs_add_alignas (location_t, 724 struct c_declspecs *, tree); 725 extern struct c_declspecs *finish_declspecs (struct c_declspecs *); 726 extern size_t c_tree_size (enum tree_code); 727 728 /* in c-objc-common.cc */ 729 extern bool c_objc_common_init (void); 730 extern bool c_missing_noreturn_ok_p (tree); 731 extern bool c_warn_unused_global_decl (const_tree); 732 extern void c_initialize_diagnostics (diagnostic_context *); 733 extern bool c_var_mod_p (tree x, tree fn); 734 extern alias_set_type c_get_alias_set (tree); 735 extern int c_type_dwarf_attribute (const_tree, int); 736 737 /* in c-typeck.cc */ 738 extern int in_alignof; 739 extern int in_sizeof; 740 extern int in_typeof; 741 extern bool c_in_omp_for; 742 extern bool c_omp_array_section_p; 743 744 extern tree c_last_sizeof_arg; 745 extern location_t c_last_sizeof_loc; 746 747 extern struct c_switch *c_switch_stack; 748 749 extern bool null_pointer_constant_p (const_tree); 750 751 752 inline bool 753 c_type_variably_modified_p (tree t) 754 { 755 return error_mark_node != t && C_TYPE_VARIABLY_MODIFIED (t); 756 } 757 758 inline bool 759 c_type_unspecified_p (tree t) 760 { 761 return error_mark_node != t 762 && C_TYPE_VARIABLE_SIZE (t) && TREE_CODE (t) == ARRAY_TYPE 763 && TYPE_DOMAIN (t) && TYPE_MAX_VALUE (TYPE_DOMAIN (t)) 764 && TREE_CODE (TYPE_MAX_VALUE (TYPE_DOMAIN (t))) == COMPOUND_EXPR 765 && integer_zerop (TREE_OPERAND (TYPE_MAX_VALUE (TYPE_DOMAIN (t)), 0)) 766 && integer_zerop (TREE_OPERAND (TYPE_MAX_VALUE (TYPE_DOMAIN (t)), 1)); 767 } 768 769 extern bool char_type_p (tree); 770 extern tree c_objc_common_truthvalue_conversion (location_t, tree, 771 tree = integer_type_node); 772 extern tree require_complete_type (location_t, tree); 773 extern bool same_translation_unit_p (const_tree, const_tree); 774 extern int comptypes (tree, tree); 775 extern bool comptypes_same_p (tree, tree); 776 extern bool comptypes_equiv_p (tree, tree); 777 extern int comptypes_check_different_types (tree, tree, bool *); 778 extern int comptypes_check_enum_int (tree, tree, bool *); 779 extern bool c_mark_addressable (tree, bool = false); 780 extern void c_incomplete_type_error (location_t, const_tree, const_tree); 781 extern tree c_type_promotes_to (tree); 782 extern struct c_expr default_function_array_conversion (location_t, 783 struct c_expr); 784 extern struct c_expr default_function_array_read_conversion (location_t, 785 struct c_expr); 786 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr, 787 bool, bool, bool = false); 788 extern tree decl_constant_value_1 (tree, bool); 789 extern void mark_exp_read (tree); 790 extern tree composite_type (tree, tree); 791 extern tree build_component_ref (location_t, tree, tree, location_t, 792 location_t); 793 extern tree build_array_ref (location_t, tree, tree); 794 extern tree build_omp_array_section (location_t, tree, tree, tree); 795 extern tree build_external_ref (location_t, tree, bool, tree *); 796 extern void pop_maybe_used (bool); 797 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr); 798 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *); 799 extern struct c_expr parser_build_unary_op (location_t, enum tree_code, 800 struct c_expr); 801 extern struct c_expr parser_build_binary_op (location_t, 802 enum tree_code, struct c_expr, 803 struct c_expr); 804 extern tree build_conditional_expr (location_t, tree, bool, tree, tree, 805 location_t, tree, tree, location_t); 806 extern tree build_compound_expr (location_t, tree, tree); 807 extern tree c_cast_expr (location_t, struct c_type_name *, tree); 808 extern tree build_c_cast (location_t, tree, tree); 809 extern void store_init_value (location_t, tree, tree, tree); 810 extern void maybe_warn_string_init (location_t, tree, struct c_expr); 811 extern void start_init (tree, tree, bool, bool, rich_location *); 812 extern void finish_init (void); 813 extern void really_start_incremental_init (tree); 814 extern void finish_implicit_inits (location_t, struct obstack *); 815 extern void push_init_level (location_t, int, struct obstack *); 816 extern struct c_expr pop_init_level (location_t, int, struct obstack *, 817 location_t); 818 extern void set_init_index (location_t, tree, tree, struct obstack *); 819 extern void set_init_label (location_t, tree, location_t, struct obstack *); 820 extern void process_init_element (location_t, struct c_expr, bool, 821 struct obstack *); 822 extern tree build_compound_literal (location_t, tree, tree, bool, 823 unsigned int, struct c_declspecs *); 824 extern void check_compound_literal_type (location_t, struct c_type_name *); 825 extern tree c_start_switch (location_t, location_t, tree, bool); 826 extern void c_finish_switch (tree, tree); 827 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool, 828 bool); 829 extern tree build_asm_stmt (bool, tree); 830 extern int c_types_compatible_p (tree, tree); 831 extern tree c_begin_compound_stmt (bool); 832 extern tree c_end_compound_stmt (location_t, tree, bool); 833 extern void c_finish_if_stmt (location_t, tree, tree, tree); 834 extern void c_finish_loop (location_t, location_t, tree, location_t, tree, 835 tree, tree, tree, bool); 836 extern tree c_begin_stmt_expr (void); 837 extern tree c_finish_stmt_expr (location_t, tree); 838 extern tree c_process_expr_stmt (location_t, tree); 839 extern tree c_finish_expr_stmt (location_t, tree); 840 extern tree c_finish_return (location_t, tree, tree); 841 extern tree c_finish_bc_stmt (location_t, tree, bool); 842 extern tree c_finish_goto_label (location_t, tree); 843 extern tree c_finish_goto_ptr (location_t, c_expr val); 844 extern tree c_expr_to_decl (tree, bool *, bool *); 845 extern tree c_finish_omp_construct (location_t, enum tree_code, tree, tree); 846 extern tree c_finish_oacc_data (location_t, tree, tree); 847 extern tree c_finish_oacc_host_data (location_t, tree, tree); 848 extern tree c_begin_omp_parallel (void); 849 extern tree c_finish_omp_parallel (location_t, tree, tree); 850 extern tree c_begin_omp_task (void); 851 extern tree c_finish_omp_task (location_t, tree, tree); 852 extern void c_finish_omp_cancel (location_t, tree); 853 extern void c_finish_omp_cancellation_point (location_t, tree); 854 extern tree c_finish_omp_clauses (tree, enum c_omp_region_type); 855 extern tree c_build_va_arg (location_t, tree, location_t, tree); 856 extern tree c_finish_transaction (location_t, tree, int); 857 extern bool c_tree_equal (tree, tree); 858 extern tree c_build_function_call_vec (location_t, const vec<location_t>&, 859 tree, vec<tree, va_gc> *, 860 vec<tree, va_gc> *); 861 extern tree c_omp_clause_copy_ctor (tree, tree, tree); 862 extern tree c_reconstruct_complex_type (tree, tree); 863 extern tree c_build_type_attribute_variant (tree ntype, tree attrs); 864 extern tree c_build_pointer_type (tree type); 865 extern tree c_build_array_type (tree type, tree domain); 866 extern tree c_build_array_type_unspecified (tree type); 867 extern tree c_build_function_type (tree type, tree args, bool no = false); 868 extern tree c_build_pointer_type_for_mode (tree type, machine_mode mode, bool m); 869 870 /* Set to 0 at beginning of a function definition, set to 1 if 871 a return statement that specifies a return value is seen. */ 872 873 extern int current_function_returns_value; 874 875 /* Set to 0 at beginning of a function definition, set to 1 if 876 a return statement with no argument is seen. */ 877 878 extern int current_function_returns_null; 879 880 /* Set to 0 at beginning of a function definition, set to 1 if 881 a call to a noreturn function is seen. */ 882 883 extern int current_function_returns_abnormally; 884 885 /* In c-decl.cc */ 886 887 /* Tell the binding oracle what kind of binding we are looking for. */ 888 889 enum c_oracle_request 890 { 891 C_ORACLE_SYMBOL, 892 C_ORACLE_TAG, 893 C_ORACLE_LABEL 894 }; 895 896 /* If this is non-NULL, then it is a "binding oracle" which can lazily 897 create bindings when needed by the C compiler. The oracle is told 898 the name and type of the binding to create. It can call pushdecl 899 or the like to ensure the binding is visible; or do nothing, 900 leaving the binding untouched. c-decl.cc takes note of when the 901 oracle has been called and will not call it again if it fails to 902 create a given binding. */ 903 904 typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier); 905 906 extern c_binding_oracle_function *c_binding_oracle; 907 908 extern void c_finish_incomplete_decl (tree); 909 extern tree c_omp_reduction_id (enum tree_code, tree); 910 extern tree c_omp_reduction_decl (tree); 911 extern tree c_omp_reduction_lookup (tree, tree); 912 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *); 913 extern bool c_check_in_current_scope (tree); 914 extern void c_pushtag (location_t, tree, tree); 915 extern void c_bind (location_t, tree, bool); 916 extern bool tag_exists_p (enum tree_code, tree); 917 918 /* In c-errors.cc */ 919 extern bool pedwarn_c90 (location_t, int opt, const char *, ...) 920 ATTRIBUTE_GCC_DIAG(3,4); 921 extern bool pedwarn_c99 (location_t, int opt, const char *, ...) 922 ATTRIBUTE_GCC_DIAG(3,4); 923 extern bool pedwarn_c11 (location_t, int opt, const char *, ...) 924 ATTRIBUTE_GCC_DIAG(3,4); 925 926 extern void 927 set_c_expr_source_range (c_expr *expr, 928 location_t start, location_t finish); 929 930 extern void 931 set_c_expr_source_range (c_expr *expr, 932 source_range src_range); 933 934 /* In c-fold.cc */ 935 extern vec<tree> incomplete_record_decls; 936 937 extern const char *c_get_sarif_source_language (const char *filename); 938 939 extern const struct scoped_attribute_specs std_attribute_table; 940 941 #if CHECKING_P 942 namespace selftest { 943 extern void run_c_tests (void); 944 } // namespace selftest 945 #endif /* #if CHECKING_P */ 946 947 948 #endif /* ! GCC_C_TREE_H */ 949
Indexes created Sat Jun 20 00:25:23 UTC 2026