1 /* Definitions for C parsing and type checking. 2 Copyright (C) 1987-2022 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 or ENUMERAL_TYPE 38 nonzero if the definition of the type has already started. */ 39 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE) 40 41 /* In an incomplete RECORD_TYPE, UNION_TYPE or ENUMERAL_TYPE, a list of 42 variable declarations whose type would be completed by completing 43 that type. */ 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)) 47 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) 51 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) 56 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) 60 61 /* Record whether a typedef for type `int' was actually `signed int'. */ 62 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP) 63 64 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit 65 return type. */ 66 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP) 67 68 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */ 69 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP) 70 71 /* For a PARM_DECL, nonzero if it was declared as an array. */ 72 #define C_ARRAY_PARAMETER(NODE) DECL_LANG_FLAG_0 (NODE) 73 74 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has 75 been declared. */ 76 #define C_DECL_DECLARED_BUILTIN(EXP) \ 77 DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP)) 78 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)) 83 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) 88 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)) 94 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)) 98 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)) 102 103 /* 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) \ 107 (EXP == 0 \ 108 || (!prototype_p (TREE_TYPE (EXP)) \ 109 && !fndecl_built_in_p (EXP))) 110 111 /* 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)) 116 117 /* 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)) 120 121 /* For a SAVE_EXPR, nonzero if the operand of the SAVE_EXPR has already 122 been folded. */ 123 #define SAVE_EXPR_FOLDED_P(EXP) TREE_LANG_FLAG_1 (SAVE_EXPR_CHECK (EXP)) 124 125 /* Record parser information about an expression that is irrelevant 126 for code generation alongside a tree representing its value. */ 127 struct c_expr 128 { 129 /* The value of the expression. */ 130 tree value; 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. */ 142 tree original_type; 143 144 /* 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; 149 150 /* Access to the first and last locations within the source spelling 151 of this expression. */ get_startc_expr152 location_t get_start () const { return src_range.m_start; } get_finishc_expr153 location_t get_finish () const { return src_range.m_finish; } 154 get_locationc_expr155 location_t get_location () const 156 { 157 if (EXPR_HAS_LOCATION (value)) 158 return EXPR_LOCATION (value); 159 else 160 return make_location (get_start (), get_start (), get_finish ()); 161 } 162 163 /* Set the value to error_mark_node whilst ensuring that src_range 164 is initialized. */ set_errorc_expr165 void set_error () 166 { 167 value = error_mark_node; 168 src_range.m_start = UNKNOWN_LOCATION; 169 src_range.m_finish = UNKNOWN_LOCATION; 170 } 171 }; 172 173 /* Type alias for struct c_expr. This allows to use the structure 174 inside the VEC types. */ 175 typedef struct c_expr c_expr_t; 176 177 /* A kind of type specifier. Note that this information is currently 178 only used to distinguish tag definitions, tag references and typeof 179 uses. */ 180 enum c_typespec_kind { 181 /* No typespec. This appears only in struct c_declspec. */ 182 ctsk_none, 183 /* A reserved keyword type specifier. */ 184 ctsk_resword, 185 /* A reference to a tag, previously declared, such as "struct foo". 186 This includes where the previous declaration was as a different 187 kind of tag, in which case this is only valid if shadowing that 188 tag in an inner scope. */ 189 ctsk_tagref, 190 /* Likewise, with standard attributes present in the reference. */ 191 ctsk_tagref_attrs, 192 /* A reference to a tag, not previously declared in a visible 193 scope. */ 194 ctsk_tagfirstref, 195 /* Likewise, with standard attributes present in the reference. */ 196 ctsk_tagfirstref_attrs, 197 /* A definition of a tag such as "struct foo { int a; }". */ 198 ctsk_tagdef, 199 /* A typedef name. */ 200 ctsk_typedef, 201 /* An ObjC-specific kind of type specifier. */ 202 ctsk_objc, 203 /* A typeof specifier, or _Atomic ( type-name ). */ 204 ctsk_typeof 205 }; 206 207 /* A type specifier: this structure is created in the parser and 208 passed to declspecs_add_type only. */ 209 struct c_typespec { 210 /* What kind of type specifier this is. */ 211 enum c_typespec_kind kind; 212 /* Whether the expression has operands suitable for use in constant 213 expressions. */ 214 bool expr_const_operands; 215 /* The specifier itself. */ 216 tree spec; 217 /* An expression to be evaluated before the type specifier, in the 218 case of typeof specifiers, or NULL otherwise or if no such 219 expression is required for a particular typeof specifier. In 220 particular, when typeof is applied to an expression of variably 221 modified type, that expression must be evaluated in order to 222 determine array sizes that form part of the type, but the 223 expression itself (as opposed to the array sizes) forms no part 224 of the type and so needs to be recorded separately. */ 225 tree expr; 226 }; 227 228 /* A storage class specifier. */ 229 enum c_storage_class { 230 csc_none, 231 csc_auto, 232 csc_extern, 233 csc_register, 234 csc_static, 235 csc_typedef 236 }; 237 238 /* A type specifier keyword "void", "_Bool", "char", "int", "float", 239 "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum", 240 or none of these. */ 241 enum c_typespec_keyword { 242 cts_none, 243 cts_void, 244 cts_bool, 245 cts_char, 246 cts_int, 247 cts_float, 248 cts_int_n, 249 cts_double, 250 cts_dfloat32, 251 cts_dfloat64, 252 cts_dfloat128, 253 cts_floatn_nx, 254 cts_fract, 255 cts_accum, 256 cts_auto_type 257 }; 258 259 /* This enum lists all the possible declarator specifiers, storage 260 class or attribute that a user can write. There is at least one 261 enumerator per possible declarator specifier in the struct 262 c_declspecs below. 263 264 It is used to index the array of declspec locations in struct 265 c_declspecs. */ 266 enum c_declspec_word { 267 cdw_typespec /* A catch-all for a typespec. */, 268 cdw_storage_class /* A catch-all for a storage class */, 269 cdw_attributes, 270 cdw_typedef, 271 cdw_explicit_signed, 272 cdw_deprecated, 273 cdw_default_int, 274 cdw_long, 275 cdw_long_long, 276 cdw_short, 277 cdw_signed, 278 cdw_unsigned, 279 cdw_complex, 280 cdw_inline, 281 cdw_noreturn, 282 cdw_thread, 283 cdw_const, 284 cdw_volatile, 285 cdw_restrict, 286 cdw_atomic, 287 cdw_saturating, 288 cdw_alignas, 289 cdw_address_space, 290 cdw_gimple, 291 cdw_rtl, 292 cdw_number_of_elements /* This one must always be the last 293 enumerator. */ 294 }; 295 296 enum c_declspec_il { 297 cdil_none, 298 cdil_gimple, /* __GIMPLE */ 299 cdil_gimple_cfg, /* __GIMPLE(cfg) */ 300 cdil_gimple_ssa, /* __GIMPLE(ssa) */ 301 cdil_rtl /* __RTL */ 302 }; 303 304 /* A sequence of declaration specifiers in C. When a new declaration 305 specifier is added, please update the enum c_declspec_word above 306 accordingly. */ 307 struct c_declspecs { 308 location_t locations[cdw_number_of_elements]; 309 /* The type specified, if a single type specifier such as a struct, 310 union or enum specifier, typedef name or typeof specifies the 311 whole type, or NULL_TREE if none or a keyword such as "void" or 312 "char" is used. Does not include qualifiers. */ 313 tree type; 314 /* Any expression to be evaluated before the type, from a typeof 315 specifier. */ 316 tree expr; 317 /* The attributes from a typedef decl. */ 318 tree decl_attr; 319 /* When parsing, the GNU attributes and prefix standard attributes. 320 Outside the parser, this will be NULL; attributes (possibly from 321 multiple lists) will be passed separately. */ 322 tree attrs; 323 /* When parsing, postfix standard attributes (which appertain to the 324 type specified by the preceding declaration specifiers, unlike 325 prefix standard attributes which appertain to the declaration or 326 declarations as a whole). */ 327 tree postfix_attrs; 328 /* The pass to start compiling a __GIMPLE or __RTL function with. */ 329 char *gimple_or_rtl_pass; 330 /* ENTRY BB count. */ 331 profile_count entry_bb_count; 332 /* The base-2 log of the greatest alignment required by an _Alignas 333 specifier, in bytes, or -1 if no such specifiers with nonzero 334 alignment. */ 335 int align_log; 336 /* For the __intN declspec, this stores the index into the int_n_* arrays. */ 337 int int_n_idx; 338 /* For the _FloatN and _FloatNx declspec, this stores the index into 339 the floatn_nx_types array. */ 340 int floatn_nx_idx; 341 /* The storage class specifier, or csc_none if none. */ 342 enum c_storage_class storage_class; 343 /* Any type specifier keyword used such as "int", not reflecting 344 modifiers such as "short", or cts_none if none. */ 345 ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8; 346 /* The kind of type specifier if one has been seen, ctsk_none 347 otherwise. */ 348 ENUM_BITFIELD (c_typespec_kind) typespec_kind : 4; 349 ENUM_BITFIELD (c_declspec_il) declspec_il : 3; 350 /* Whether any expressions in typeof specifiers may appear in 351 constant expressions. */ 352 BOOL_BITFIELD expr_const_operands : 1; 353 /* Whether any declaration specifiers have been seen at all. */ 354 BOOL_BITFIELD declspecs_seen_p : 1; 355 /* Whether any declaration specifiers other than standard attributes 356 have been seen at all. If only standard attributes have been 357 seen, this is an attribute-declaration. */ 358 BOOL_BITFIELD non_std_attrs_seen_p : 1; 359 /* Whether something other than a storage class specifier or 360 attribute has been seen. This is used to warn for the 361 obsolescent usage of storage class specifiers other than at the 362 start of the list. (Doing this properly would require function 363 specifiers to be handled separately from storage class 364 specifiers.) */ 365 BOOL_BITFIELD non_sc_seen_p : 1; 366 /* Whether the type is specified by a typedef or typeof name. */ 367 BOOL_BITFIELD typedef_p : 1; 368 /* Whether the type is explicitly "signed" or specified by a typedef 369 whose type is explicitly "signed". */ 370 BOOL_BITFIELD explicit_signed_p : 1; 371 /* Whether the specifiers include a deprecated typedef. */ 372 BOOL_BITFIELD deprecated_p : 1; 373 /* Whether the specifiers include an unavailable typedef. */ 374 BOOL_BITFIELD unavailable_p : 1; 375 /* Whether the type defaulted to "int" because there were no type 376 specifiers. */ 377 BOOL_BITFIELD default_int_p : 1; 378 /* Whether "long" was specified. */ 379 BOOL_BITFIELD long_p : 1; 380 /* Whether "long" was specified more than once. */ 381 BOOL_BITFIELD long_long_p : 1; 382 /* Whether "short" was specified. */ 383 BOOL_BITFIELD short_p : 1; 384 /* Whether "signed" was specified. */ 385 BOOL_BITFIELD signed_p : 1; 386 /* Whether "unsigned" was specified. */ 387 BOOL_BITFIELD unsigned_p : 1; 388 /* Whether "complex" was specified. */ 389 BOOL_BITFIELD complex_p : 1; 390 /* Whether "inline" was specified. */ 391 BOOL_BITFIELD inline_p : 1; 392 /* Whether "_Noreturn" was speciied. */ 393 BOOL_BITFIELD noreturn_p : 1; 394 /* Whether "__thread" or "_Thread_local" was specified. */ 395 BOOL_BITFIELD thread_p : 1; 396 /* Whether "__thread" rather than "_Thread_local" was specified. */ 397 BOOL_BITFIELD thread_gnu_p : 1; 398 /* Whether "const" was specified. */ 399 BOOL_BITFIELD const_p : 1; 400 /* Whether "volatile" was specified. */ 401 BOOL_BITFIELD volatile_p : 1; 402 /* Whether "restrict" was specified. */ 403 BOOL_BITFIELD restrict_p : 1; 404 /* Whether "_Atomic" was specified. */ 405 BOOL_BITFIELD atomic_p : 1; 406 /* Whether "_Sat" was specified. */ 407 BOOL_BITFIELD saturating_p : 1; 408 /* Whether any alignment specifier (even with zero alignment) was 409 specified. */ 410 BOOL_BITFIELD alignas_p : 1; 411 /* The address space that the declaration belongs to. */ 412 addr_space_t address_space; 413 }; 414 415 /* The various kinds of declarators in C. */ 416 enum c_declarator_kind { 417 /* An identifier. */ 418 cdk_id, 419 /* A function. */ 420 cdk_function, 421 /* An array. */ 422 cdk_array, 423 /* A pointer. */ 424 cdk_pointer, 425 /* Parenthesized declarator with nested attributes. */ 426 cdk_attrs 427 }; 428 429 struct c_arg_tag { 430 /* The argument name. */ 431 tree id; 432 /* The type of the argument. */ 433 tree type; 434 }; 435 436 437 /* Information about the parameters in a function declarator. */ 438 struct c_arg_info { 439 /* A list of parameter decls. */ 440 tree parms; 441 /* A list of structure, union and enum tags defined. */ 442 vec<c_arg_tag, va_gc> *tags; 443 /* A list of argument types to go in the FUNCTION_TYPE. */ 444 tree types; 445 /* A list of non-parameter decls (notably enumeration constants) 446 defined with the parameters. */ 447 tree others; 448 /* A compound expression of VLA sizes from the parameters, or NULL. 449 In a function definition, these are used to ensure that 450 side-effects in sizes of arrays converted to pointers (such as a 451 parameter int i[n++]) take place; otherwise, they are 452 ignored. */ 453 tree pending_sizes; 454 /* True when these arguments had [*]. */ 455 BOOL_BITFIELD had_vla_unspec : 1; 456 }; 457 458 /* A declarator. */ 459 struct c_declarator { 460 /* The kind of declarator. */ 461 enum c_declarator_kind kind; 462 location_t id_loc; /* Currently only set for cdk_id, cdk_array. */ 463 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */ 464 struct c_declarator *declarator; 465 union { 466 /* For identifiers. */ 467 struct { 468 /* An IDENTIFIER_NODE, or NULL_TREE if an abstract 469 declarator. */ 470 tree id; 471 /* Any attributes (which apply to the declaration rather than to 472 the type described by the outer declarators). */ 473 tree attrs; 474 } id; 475 /* For functions. */ 476 struct c_arg_info *arg_info; 477 /* For arrays. */ 478 struct { 479 /* The array dimension, or NULL for [] and [*]. */ 480 tree dimen; 481 /* The qualifiers inside []. */ 482 int quals; 483 /* The attributes (currently ignored) inside []. */ 484 tree attrs; 485 /* Whether [static] was used. */ 486 BOOL_BITFIELD static_p : 1; 487 /* Whether [*] was used. */ 488 BOOL_BITFIELD vla_unspec_p : 1; 489 } array; 490 /* For pointers, the qualifiers on the pointer type. */ 491 int pointer_quals; 492 /* For attributes. */ 493 tree attrs; 494 } u; 495 }; 496 497 /* A type name. */ 498 struct c_type_name { 499 /* The declaration specifiers. */ 500 struct c_declspecs *specs; 501 /* The declarator. */ 502 struct c_declarator *declarator; 503 }; 504 505 /* A parameter. */ 506 struct c_parm { 507 /* The declaration specifiers, minus any prefix attributes. */ 508 struct c_declspecs *specs; 509 /* The attributes. */ 510 tree attrs; 511 /* The declarator. */ 512 struct c_declarator *declarator; 513 /* The location of the parameter. */ 514 location_t loc; 515 }; 516 517 /* Used when parsing an enum. Initialized by start_enum. */ 518 struct c_enum_contents 519 { 520 /* While defining an enum type, this is 1 plus the last enumerator 521 constant value. */ 522 tree enum_next_value; 523 524 /* Nonzero means that there was overflow computing enum_next_value. */ 525 int enum_overflow; 526 }; 527 528 /* A type of reference to a static identifier in an inline 529 function. */ 530 enum c_inline_static_type { 531 /* Identifier with internal linkage used in function that may be an 532 inline definition (i.e., file-scope static). */ 533 csi_internal, 534 /* Modifiable object with static storage duration defined in 535 function that may be an inline definition (i.e., local 536 static). */ 537 csi_modifiable 538 }; 539 540 541 /* in c-parser.cc */ 542 extern void c_parse_init (void); 543 extern bool c_keyword_starts_typename (enum rid keyword); 544 545 /* in c-aux-info.cc */ 546 extern void gen_aux_info_record (tree, int, int, int); 547 548 /* in c-decl.cc */ 549 struct c_spot_bindings; 550 class c_struct_parse_info; 551 extern struct obstack parser_obstack; 552 /* Set to IN_ITERATION_STMT if parsing an iteration-statement, 553 to IN_OMP_BLOCK if parsing OpenMP structured block and 554 IN_OMP_FOR if parsing OpenMP loop. If parsing a switch statement, 555 this is bitwise ORed with IN_SWITCH_STMT, unless parsing an 556 iteration-statement, OpenMP block or loop within that switch. */ 557 #define IN_SWITCH_STMT 1 558 #define IN_ITERATION_STMT 2 559 #define IN_OMP_BLOCK 4 560 #define IN_OMP_FOR 8 561 #define IN_OBJC_FOREACH 16 562 extern unsigned char in_statement; 563 564 extern bool switch_statement_break_seen_p; 565 566 extern bool global_bindings_p (void); 567 extern tree pushdecl (tree); 568 extern void push_scope (void); 569 extern tree pop_scope (void); 570 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *); 571 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *); 572 573 extern void record_inline_static (location_t, tree, tree, 574 enum c_inline_static_type); 575 extern void c_init_decl_processing (void); 576 extern void c_print_identifier (FILE *, tree, int); 577 extern int quals_from_declspecs (const struct c_declspecs *); 578 extern struct c_declarator *build_array_declarator (location_t, tree, 579 struct c_declspecs *, 580 bool, bool); 581 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *, 582 tree, tree); 583 extern tree check_for_loop_decls (location_t, bool); 584 extern void mark_forward_parm_decls (void); 585 extern void declare_parm_level (void); 586 extern void undeclared_variable (location_t, tree); 587 extern tree lookup_label_for_goto (location_t, tree); 588 extern tree declare_label (tree); 589 extern tree define_label (location_t, tree); 590 extern struct c_spot_bindings *c_get_switch_bindings (void); 591 extern void c_release_switch_bindings (struct c_spot_bindings *); 592 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *, 593 location_t, location_t); 594 extern void finish_decl (tree, location_t, tree, tree, tree); 595 extern tree finish_enum (tree, tree, tree); 596 extern void finish_function (location_t = input_location); 597 extern tree finish_struct (location_t, tree, tree, tree, 598 class c_struct_parse_info *); 599 extern tree c_simulate_enum_decl (location_t, const char *, 600 vec<string_int_pair> *); 601 extern tree c_simulate_record_decl (location_t, const char *, 602 array_slice<const tree>); 603 extern struct c_arg_info *build_arg_info (void); 604 extern struct c_arg_info *get_parm_info (bool, tree); 605 extern tree grokfield (location_t, struct c_declarator *, 606 struct c_declspecs *, tree, tree *); 607 extern tree groktypename (struct c_type_name *, tree *, bool *); 608 extern tree grokparm (const struct c_parm *, tree *); 609 extern tree implicitly_declare (location_t, tree); 610 extern void keep_next_level (void); 611 extern void pending_xref_error (void); 612 extern void c_push_function_context (void); 613 extern void c_pop_function_context (void); 614 extern void push_parm_decl (const struct c_parm *, tree *); 615 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *, 616 struct c_declarator *); 617 extern tree c_builtin_function (tree); 618 extern tree c_builtin_function_ext_scope (tree); 619 extern tree c_simulate_builtin_function_decl (tree); 620 extern void c_warn_unused_attributes (tree); 621 extern tree c_warn_type_attributes (tree); 622 extern void shadow_tag (const struct c_declspecs *); 623 extern void shadow_tag_warned (const struct c_declspecs *, int); 624 extern tree start_enum (location_t, struct c_enum_contents *, tree); 625 extern bool start_function (struct c_declspecs *, struct c_declarator *, tree); 626 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool, 627 tree, location_t * = NULL); 628 extern tree start_struct (location_t, enum tree_code, tree, 629 class c_struct_parse_info **); 630 extern void store_parm_decls (void); 631 extern void store_parm_decls_from (struct c_arg_info *); 632 extern void temp_store_parm_decls (tree, tree); 633 extern void temp_pop_parm_decls (void); 634 extern tree xref_tag (enum tree_code, tree); 635 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree, 636 bool, tree); 637 extern struct c_parm *build_c_parm (struct c_declspecs *, tree, 638 struct c_declarator *, location_t); 639 extern struct c_declarator *build_attrs_declarator (tree, 640 struct c_declarator *); 641 extern struct c_declarator *build_function_declarator (struct c_arg_info *, 642 struct c_declarator *); 643 extern struct c_declarator *build_id_declarator (tree); 644 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *, 645 struct c_declarator *); 646 extern struct c_declspecs *build_null_declspecs (void); 647 extern struct c_declspecs *declspecs_add_qual (location_t, 648 struct c_declspecs *, tree); 649 extern struct c_declspecs *declspecs_add_type (location_t, 650 struct c_declspecs *, 651 struct c_typespec); 652 extern struct c_declspecs *declspecs_add_scspec (location_t, 653 struct c_declspecs *, tree); 654 extern struct c_declspecs *declspecs_add_attrs (location_t, 655 struct c_declspecs *, tree); 656 extern struct c_declspecs *declspecs_add_addrspace (location_t, 657 struct c_declspecs *, 658 addr_space_t); 659 extern struct c_declspecs *declspecs_add_alignas (location_t, 660 struct c_declspecs *, tree); 661 extern struct c_declspecs *finish_declspecs (struct c_declspecs *); 662 663 /* in c-objc-common.cc */ 664 extern bool c_objc_common_init (void); 665 extern bool c_missing_noreturn_ok_p (tree); 666 extern bool c_warn_unused_global_decl (const_tree); 667 extern void c_initialize_diagnostics (diagnostic_context *); 668 extern bool c_vla_unspec_p (tree x, tree fn); 669 extern alias_set_type c_get_alias_set (tree); 670 671 /* in c-typeck.cc */ 672 extern int in_alignof; 673 extern int in_sizeof; 674 extern int in_typeof; 675 extern bool c_in_omp_for; 676 677 extern tree c_last_sizeof_arg; 678 extern location_t c_last_sizeof_loc; 679 680 extern struct c_switch *c_switch_stack; 681 682 extern bool char_type_p (tree); 683 extern tree c_objc_common_truthvalue_conversion (location_t, tree); 684 extern tree require_complete_type (location_t, tree); 685 extern bool same_translation_unit_p (const_tree, const_tree); 686 extern int comptypes (tree, tree); 687 extern int comptypes_check_different_types (tree, tree, bool *); 688 extern bool c_vla_type_p (const_tree); 689 extern bool c_mark_addressable (tree, bool = false); 690 extern void c_incomplete_type_error (location_t, const_tree, const_tree); 691 extern tree c_type_promotes_to (tree); 692 extern struct c_expr default_function_array_conversion (location_t, 693 struct c_expr); 694 extern struct c_expr default_function_array_read_conversion (location_t, 695 struct c_expr); 696 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr, 697 bool, bool); 698 extern tree decl_constant_value_1 (tree, bool); 699 extern void mark_exp_read (tree); 700 extern tree composite_type (tree, tree); 701 extern tree build_component_ref (location_t, tree, tree, location_t); 702 extern tree build_array_ref (location_t, tree, tree); 703 extern tree build_external_ref (location_t, tree, bool, tree *); 704 extern void pop_maybe_used (bool); 705 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr); 706 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *); 707 extern struct c_expr parser_build_unary_op (location_t, enum tree_code, 708 struct c_expr); 709 extern struct c_expr parser_build_binary_op (location_t, 710 enum tree_code, struct c_expr, 711 struct c_expr); 712 extern tree build_conditional_expr (location_t, tree, bool, tree, tree, 713 location_t, tree, tree, location_t); 714 extern tree build_compound_expr (location_t, tree, tree); 715 extern tree c_cast_expr (location_t, struct c_type_name *, tree); 716 extern tree build_c_cast (location_t, tree, tree); 717 extern void store_init_value (location_t, tree, tree, tree); 718 extern void maybe_warn_string_init (location_t, tree, struct c_expr); 719 extern void start_init (tree, tree, int, rich_location *); 720 extern void finish_init (void); 721 extern void really_start_incremental_init (tree); 722 extern void finish_implicit_inits (location_t, struct obstack *); 723 extern void push_init_level (location_t, int, struct obstack *); 724 extern struct c_expr pop_init_level (location_t, int, struct obstack *, 725 location_t); 726 extern void set_init_index (location_t, tree, tree, struct obstack *); 727 extern void set_init_label (location_t, tree, location_t, struct obstack *); 728 extern void process_init_element (location_t, struct c_expr, bool, 729 struct obstack *); 730 extern tree build_compound_literal (location_t, tree, tree, bool, 731 unsigned int); 732 extern void check_compound_literal_type (location_t, struct c_type_name *); 733 extern tree c_start_switch (location_t, location_t, tree, bool); 734 extern void c_finish_switch (tree, tree); 735 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool, 736 bool); 737 extern tree build_asm_stmt (bool, tree); 738 extern int c_types_compatible_p (tree, tree); 739 extern tree c_begin_compound_stmt (bool); 740 extern tree c_end_compound_stmt (location_t, tree, bool); 741 extern void c_finish_if_stmt (location_t, tree, tree, tree); 742 extern void c_finish_loop (location_t, location_t, tree, location_t, tree, 743 tree, tree, tree, bool); 744 extern tree c_begin_stmt_expr (void); 745 extern tree c_finish_stmt_expr (location_t, tree); 746 extern tree c_process_expr_stmt (location_t, tree); 747 extern tree c_finish_expr_stmt (location_t, tree); 748 extern tree c_finish_return (location_t, tree, tree); 749 extern tree c_finish_bc_stmt (location_t, tree, bool); 750 extern tree c_finish_goto_label (location_t, tree); 751 extern tree c_finish_goto_ptr (location_t, c_expr val); 752 extern tree c_expr_to_decl (tree, bool *, bool *); 753 extern tree c_finish_omp_construct (location_t, enum tree_code, tree, tree); 754 extern tree c_finish_oacc_data (location_t, tree, tree); 755 extern tree c_finish_oacc_host_data (location_t, tree, tree); 756 extern tree c_begin_omp_parallel (void); 757 extern tree c_finish_omp_parallel (location_t, tree, tree); 758 extern tree c_begin_omp_task (void); 759 extern tree c_finish_omp_task (location_t, tree, tree); 760 extern void c_finish_omp_cancel (location_t, tree); 761 extern void c_finish_omp_cancellation_point (location_t, tree); 762 extern tree c_finish_omp_clauses (tree, enum c_omp_region_type); 763 extern tree c_build_va_arg (location_t, tree, location_t, tree); 764 extern tree c_finish_transaction (location_t, tree, int); 765 extern bool c_tree_equal (tree, tree); 766 extern tree c_build_function_call_vec (location_t, const vec<location_t>&, 767 tree, vec<tree, va_gc> *, 768 vec<tree, va_gc> *); 769 extern tree c_omp_clause_copy_ctor (tree, tree, tree); 770 771 /* Set to 0 at beginning of a function definition, set to 1 if 772 a return statement that specifies a return value is seen. */ 773 774 extern int current_function_returns_value; 775 776 /* Set to 0 at beginning of a function definition, set to 1 if 777 a return statement with no argument is seen. */ 778 779 extern int current_function_returns_null; 780 781 /* Set to 0 at beginning of a function definition, set to 1 if 782 a call to a noreturn function is seen. */ 783 784 extern int current_function_returns_abnormally; 785 786 /* In c-decl.cc */ 787 788 /* Tell the binding oracle what kind of binding we are looking for. */ 789 790 enum c_oracle_request 791 { 792 C_ORACLE_SYMBOL, 793 C_ORACLE_TAG, 794 C_ORACLE_LABEL 795 }; 796 797 /* If this is non-NULL, then it is a "binding oracle" which can lazily 798 create bindings when needed by the C compiler. The oracle is told 799 the name and type of the binding to create. It can call pushdecl 800 or the like to ensure the binding is visible; or do nothing, 801 leaving the binding untouched. c-decl.cc takes note of when the 802 oracle has been called and will not call it again if it fails to 803 create a given binding. */ 804 805 typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier); 806 807 extern c_binding_oracle_function *c_binding_oracle; 808 809 extern void c_finish_incomplete_decl (tree); 810 extern tree c_omp_reduction_id (enum tree_code, tree); 811 extern tree c_omp_reduction_decl (tree); 812 extern tree c_omp_reduction_lookup (tree, tree); 813 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *); 814 extern bool c_check_in_current_scope (tree); 815 extern void c_pushtag (location_t, tree, tree); 816 extern void c_bind (location_t, tree, bool); 817 extern bool tag_exists_p (enum tree_code, tree); 818 819 /* In c-errors.cc */ 820 extern bool pedwarn_c90 (location_t, int opt, const char *, ...) 821 ATTRIBUTE_GCC_DIAG(3,4); 822 extern bool pedwarn_c99 (location_t, int opt, const char *, ...) 823 ATTRIBUTE_GCC_DIAG(3,4); 824 extern bool pedwarn_c11 (location_t, int opt, const char *, ...) 825 ATTRIBUTE_GCC_DIAG(3,4); 826 827 extern void 828 set_c_expr_source_range (c_expr *expr, 829 location_t start, location_t finish); 830 831 extern void 832 set_c_expr_source_range (c_expr *expr, 833 source_range src_range); 834 835 /* In c-fold.cc */ 836 extern vec<tree> incomplete_record_decls; 837 838 #if CHECKING_P 839 namespace selftest { 840 extern void run_c_tests (void); 841 } // namespace selftest 842 #endif /* #if CHECKING_P */ 843 844 845 #endif /* ! GCC_C_TREE_H */ 846