1 /* Definitions for C parsing and type checking. 2 Copyright (C) 1987-2017 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.c, but langhooks.c needs to 27 know how big it is. This is sanity-checked in c-decl.c. */ 28 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \ 29 (sizeof (struct c_common_identifier) + 3 * sizeof (void *)) 30 31 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */ 32 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE) 33 34 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */ 35 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE) 36 37 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE 38 nonzero if the definition of the type has already started. */ 39 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE) 40 41 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable 42 declarations whose type would be completed by completing that type. */ 43 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE) 44 45 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a 46 keyword. C_RID_CODE (node) is then the RID_* value of the keyword. */ 47 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID) 48 49 /* Record whether a type or decl was written with nonconstant size. 50 Note that TYPE_SIZE may have simplified to a constant. */ 51 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE) 52 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE) 53 54 /* Record whether a type is defined inside a struct or union type. 55 This is used for -Wc++-compat. */ 56 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE) 57 58 /* Record whether an "incomplete type" error was given for the type. */ 59 #define C_TYPE_ERROR_REPORTED(TYPE) TYPE_LANG_FLAG_3 (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 /* Nonzero for a decl which either doesn't exist or isn't a prototype. 100 N.B. Could be simplified if all built-in decls had complete prototypes 101 (but this is presently difficult because some of them need FILE*). */ 102 #define C_DECL_ISNT_PROTOTYPE(EXP) \ 103 (EXP == 0 \ 104 || (!prototype_p (TREE_TYPE (EXP)) \ 105 && !DECL_BUILT_IN (EXP))) 106 107 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as 108 TYPE_ARG_TYPES for functions with prototypes, but created for functions 109 without prototypes. */ 110 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE) 111 112 /* For a CONSTRUCTOR, whether some initializer contains a 113 subexpression meaning it is not a constant expression. */ 114 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR)) 115 116 /* Record parser information about an expression that is irrelevant 117 for code generation alongside a tree representing its value. */ 118 struct c_expr 119 { 120 /* The value of the expression. */ 121 tree value; 122 /* Record the original unary/binary operator of an expression, which may 123 have been changed by fold, STRING_CST for unparenthesized string 124 constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls 125 (even if parenthesized), for subexpressions, and for non-constant 126 initializers, or ERROR_MARK for other expressions (including 127 parenthesized expressions). */ 128 enum tree_code original_code; 129 /* If not NULL, the original type of an expression. This will 130 differ from the type of the value field for an enum constant. 131 The type of an enum constant is a plain integer type, but this 132 field will be the enum type. */ 133 tree original_type; 134 135 /* The source range of this expression. This is redundant 136 for node values that have locations, but not all node kinds 137 have locations (e.g. constants, and references to params, locals, 138 etc), so we stash a copy here. */ 139 source_range src_range; 140 141 /* Access to the first and last locations within the source spelling 142 of this expression. */ 143 location_t get_start () const { return src_range.m_start; } 144 location_t get_finish () const { return src_range.m_finish; } 145 146 /* Set the value to error_mark_node whilst ensuring that src_range 147 is initialized. */ 148 void set_error () 149 { 150 value = error_mark_node; 151 src_range.m_start = UNKNOWN_LOCATION; 152 src_range.m_finish = UNKNOWN_LOCATION; 153 } 154 }; 155 156 /* Type alias for struct c_expr. This allows to use the structure 157 inside the VEC types. */ 158 typedef struct c_expr c_expr_t; 159 160 /* A kind of type specifier. Note that this information is currently 161 only used to distinguish tag definitions, tag references and typeof 162 uses. */ 163 enum c_typespec_kind { 164 /* No typespec. This appears only in struct c_declspec. */ 165 ctsk_none, 166 /* A reserved keyword type specifier. */ 167 ctsk_resword, 168 /* A reference to a tag, previously declared, such as "struct foo". 169 This includes where the previous declaration was as a different 170 kind of tag, in which case this is only valid if shadowing that 171 tag in an inner scope. */ 172 ctsk_tagref, 173 /* A reference to a tag, not previously declared in a visible 174 scope. */ 175 ctsk_tagfirstref, 176 /* A definition of a tag such as "struct foo { int a; }". */ 177 ctsk_tagdef, 178 /* A typedef name. */ 179 ctsk_typedef, 180 /* An ObjC-specific kind of type specifier. */ 181 ctsk_objc, 182 /* A typeof specifier, or _Atomic ( type-name ). */ 183 ctsk_typeof 184 }; 185 186 /* A type specifier: this structure is created in the parser and 187 passed to declspecs_add_type only. */ 188 struct c_typespec { 189 /* What kind of type specifier this is. */ 190 enum c_typespec_kind kind; 191 /* Whether the expression has operands suitable for use in constant 192 expressions. */ 193 bool expr_const_operands; 194 /* The specifier itself. */ 195 tree spec; 196 /* An expression to be evaluated before the type specifier, in the 197 case of typeof specifiers, or NULL otherwise or if no such 198 expression is required for a particular typeof specifier. In 199 particular, when typeof is applied to an expression of variably 200 modified type, that expression must be evaluated in order to 201 determine array sizes that form part of the type, but the 202 expression itself (as opposed to the array sizes) forms no part 203 of the type and so needs to be recorded separately. */ 204 tree expr; 205 }; 206 207 /* A storage class specifier. */ 208 enum c_storage_class { 209 csc_none, 210 csc_auto, 211 csc_extern, 212 csc_register, 213 csc_static, 214 csc_typedef 215 }; 216 217 /* A type specifier keyword "void", "_Bool", "char", "int", "float", 218 "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum", 219 or none of these. */ 220 enum c_typespec_keyword { 221 cts_none, 222 cts_void, 223 cts_bool, 224 cts_char, 225 cts_int, 226 cts_float, 227 cts_int_n, 228 cts_double, 229 cts_dfloat32, 230 cts_dfloat64, 231 cts_dfloat128, 232 cts_floatn_nx, 233 cts_fract, 234 cts_accum, 235 cts_auto_type 236 }; 237 238 /* This enum lists all the possible declarator specifiers, storage 239 class or attribute that a user can write. There is at least one 240 enumerator per possible declarator specifier in the struct 241 c_declspecs below. 242 243 It is used to index the array of declspec locations in struct 244 c_declspecs. */ 245 enum c_declspec_word { 246 cdw_typespec /* A catch-all for a typespec. */, 247 cdw_storage_class /* A catch-all for a storage class */, 248 cdw_attributes, 249 cdw_typedef, 250 cdw_explicit_signed, 251 cdw_deprecated, 252 cdw_default_int, 253 cdw_long, 254 cdw_long_long, 255 cdw_short, 256 cdw_signed, 257 cdw_unsigned, 258 cdw_complex, 259 cdw_inline, 260 cdw_noreturn, 261 cdw_thread, 262 cdw_const, 263 cdw_volatile, 264 cdw_restrict, 265 cdw_atomic, 266 cdw_saturating, 267 cdw_alignas, 268 cdw_address_space, 269 cdw_gimple, 270 cdw_rtl, 271 cdw_number_of_elements /* This one must always be the last 272 enumerator. */ 273 }; 274 275 /* A sequence of declaration specifiers in C. When a new declaration 276 specifier is added, please update the enum c_declspec_word above 277 accordingly. */ 278 struct c_declspecs { 279 source_location locations[cdw_number_of_elements]; 280 /* The type specified, if a single type specifier such as a struct, 281 union or enum specifier, typedef name or typeof specifies the 282 whole type, or NULL_TREE if none or a keyword such as "void" or 283 "char" is used. Does not include qualifiers. */ 284 tree type; 285 /* Any expression to be evaluated before the type, from a typeof 286 specifier. */ 287 tree expr; 288 /* The attributes from a typedef decl. */ 289 tree decl_attr; 290 /* When parsing, the attributes. Outside the parser, this will be 291 NULL; attributes (possibly from multiple lists) will be passed 292 separately. */ 293 tree attrs; 294 /* The pass to start compiling a __GIMPLE or __RTL function with. */ 295 char *gimple_or_rtl_pass; 296 /* The base-2 log of the greatest alignment required by an _Alignas 297 specifier, in bytes, or -1 if no such specifiers with nonzero 298 alignment. */ 299 int align_log; 300 /* For the __intN declspec, this stores the index into the int_n_* arrays. */ 301 int int_n_idx; 302 /* For the _FloatN and _FloatNx declspec, this stores the index into 303 the floatn_nx_types array. */ 304 int floatn_nx_idx; 305 /* The storage class specifier, or csc_none if none. */ 306 enum c_storage_class storage_class; 307 /* Any type specifier keyword used such as "int", not reflecting 308 modifiers such as "short", or cts_none if none. */ 309 ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8; 310 /* The kind of type specifier if one has been seen, ctsk_none 311 otherwise. */ 312 ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3; 313 /* Whether any expressions in typeof specifiers may appear in 314 constant expressions. */ 315 BOOL_BITFIELD expr_const_operands : 1; 316 /* Whether any declaration specifiers have been seen at all. */ 317 BOOL_BITFIELD declspecs_seen_p : 1; 318 /* Whether something other than a storage class specifier or 319 attribute has been seen. This is used to warn for the 320 obsolescent usage of storage class specifiers other than at the 321 start of the list. (Doing this properly would require function 322 specifiers to be handled separately from storage class 323 specifiers.) */ 324 BOOL_BITFIELD non_sc_seen_p : 1; 325 /* Whether the type is specified by a typedef or typeof name. */ 326 BOOL_BITFIELD typedef_p : 1; 327 /* Whether the type is explicitly "signed" or specified by a typedef 328 whose type is explicitly "signed". */ 329 BOOL_BITFIELD explicit_signed_p : 1; 330 /* Whether the specifiers include a deprecated typedef. */ 331 BOOL_BITFIELD deprecated_p : 1; 332 /* Whether the type defaulted to "int" because there were no type 333 specifiers. */ 334 BOOL_BITFIELD default_int_p : 1; 335 /* Whether "long" was specified. */ 336 BOOL_BITFIELD long_p : 1; 337 /* Whether "long" was specified more than once. */ 338 BOOL_BITFIELD long_long_p : 1; 339 /* Whether "short" was specified. */ 340 BOOL_BITFIELD short_p : 1; 341 /* Whether "signed" was specified. */ 342 BOOL_BITFIELD signed_p : 1; 343 /* Whether "unsigned" was specified. */ 344 BOOL_BITFIELD unsigned_p : 1; 345 /* Whether "complex" was specified. */ 346 BOOL_BITFIELD complex_p : 1; 347 /* Whether "inline" was specified. */ 348 BOOL_BITFIELD inline_p : 1; 349 /* Whether "_Noreturn" was speciied. */ 350 BOOL_BITFIELD noreturn_p : 1; 351 /* Whether "__thread" or "_Thread_local" was specified. */ 352 BOOL_BITFIELD thread_p : 1; 353 /* Whether "__thread" rather than "_Thread_local" was specified. */ 354 BOOL_BITFIELD thread_gnu_p : 1; 355 /* Whether "const" was specified. */ 356 BOOL_BITFIELD const_p : 1; 357 /* Whether "volatile" was specified. */ 358 BOOL_BITFIELD volatile_p : 1; 359 /* Whether "restrict" was specified. */ 360 BOOL_BITFIELD restrict_p : 1; 361 /* Whether "_Atomic" was specified. */ 362 BOOL_BITFIELD atomic_p : 1; 363 /* Whether "_Sat" was specified. */ 364 BOOL_BITFIELD saturating_p : 1; 365 /* Whether any alignment specifier (even with zero alignment) was 366 specified. */ 367 BOOL_BITFIELD alignas_p : 1; 368 /* Whether any __GIMPLE specifier was specified. */ 369 BOOL_BITFIELD gimple_p : 1; 370 /* Whether any __RTL specifier was specified. */ 371 BOOL_BITFIELD rtl_p : 1; 372 /* The address space that the declaration belongs to. */ 373 addr_space_t address_space; 374 }; 375 376 /* The various kinds of declarators in C. */ 377 enum c_declarator_kind { 378 /* An identifier. */ 379 cdk_id, 380 /* A function. */ 381 cdk_function, 382 /* An array. */ 383 cdk_array, 384 /* A pointer. */ 385 cdk_pointer, 386 /* Parenthesized declarator with nested attributes. */ 387 cdk_attrs 388 }; 389 390 struct c_arg_tag { 391 /* The argument name. */ 392 tree id; 393 /* The type of the argument. */ 394 tree type; 395 }; 396 397 398 /* Information about the parameters in a function declarator. */ 399 struct c_arg_info { 400 /* A list of parameter decls. */ 401 tree parms; 402 /* A list of structure, union and enum tags defined. */ 403 vec<c_arg_tag, va_gc> *tags; 404 /* A list of argument types to go in the FUNCTION_TYPE. */ 405 tree types; 406 /* A list of non-parameter decls (notably enumeration constants) 407 defined with the parameters. */ 408 tree others; 409 /* A compound expression of VLA sizes from the parameters, or NULL. 410 In a function definition, these are used to ensure that 411 side-effects in sizes of arrays converted to pointers (such as a 412 parameter int i[n++]) take place; otherwise, they are 413 ignored. */ 414 tree pending_sizes; 415 /* True when these arguments had [*]. */ 416 BOOL_BITFIELD had_vla_unspec : 1; 417 }; 418 419 /* A declarator. */ 420 struct c_declarator { 421 /* The kind of declarator. */ 422 enum c_declarator_kind kind; 423 location_t id_loc; /* Currently only set for cdk_id, cdk_array. */ 424 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */ 425 struct c_declarator *declarator; 426 union { 427 /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract 428 declarator. */ 429 tree id; 430 /* For functions. */ 431 struct c_arg_info *arg_info; 432 /* For arrays. */ 433 struct { 434 /* The array dimension, or NULL for [] and [*]. */ 435 tree dimen; 436 /* The qualifiers inside []. */ 437 int quals; 438 /* The attributes (currently ignored) inside []. */ 439 tree attrs; 440 /* Whether [static] was used. */ 441 BOOL_BITFIELD static_p : 1; 442 /* Whether [*] was used. */ 443 BOOL_BITFIELD vla_unspec_p : 1; 444 } array; 445 /* For pointers, the qualifiers on the pointer type. */ 446 int pointer_quals; 447 /* For attributes. */ 448 tree attrs; 449 } u; 450 }; 451 452 /* A type name. */ 453 struct c_type_name { 454 /* The declaration specifiers. */ 455 struct c_declspecs *specs; 456 /* The declarator. */ 457 struct c_declarator *declarator; 458 }; 459 460 /* A parameter. */ 461 struct c_parm { 462 /* The declaration specifiers, minus any prefix attributes. */ 463 struct c_declspecs *specs; 464 /* The attributes. */ 465 tree attrs; 466 /* The declarator. */ 467 struct c_declarator *declarator; 468 }; 469 470 /* Used when parsing an enum. Initialized by start_enum. */ 471 struct c_enum_contents 472 { 473 /* While defining an enum type, this is 1 plus the last enumerator 474 constant value. */ 475 tree enum_next_value; 476 477 /* Nonzero means that there was overflow computing enum_next_value. */ 478 int enum_overflow; 479 }; 480 481 /* A type of reference to a static identifier in an inline 482 function. */ 483 enum c_inline_static_type { 484 /* Identifier with internal linkage used in function that may be an 485 inline definition (i.e., file-scope static). */ 486 csi_internal, 487 /* Modifiable object with static storage duration defined in 488 function that may be an inline definition (i.e., local 489 static). */ 490 csi_modifiable 491 }; 492 493 494 /* in c-parser.c */ 495 extern void c_parse_init (void); 496 extern bool c_keyword_starts_typename (enum rid keyword); 497 498 /* in c-aux-info.c */ 499 extern void gen_aux_info_record (tree, int, int, int); 500 501 /* in c-decl.c */ 502 struct c_spot_bindings; 503 struct c_struct_parse_info; 504 extern struct obstack parser_obstack; 505 extern tree c_break_label; 506 extern tree c_cont_label; 507 508 extern bool global_bindings_p (void); 509 extern void push_scope (void); 510 extern tree pop_scope (void); 511 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *); 512 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *); 513 514 extern void record_inline_static (location_t, tree, tree, 515 enum c_inline_static_type); 516 extern void c_init_decl_processing (void); 517 extern void c_print_identifier (FILE *, tree, int); 518 extern int quals_from_declspecs (const struct c_declspecs *); 519 extern struct c_declarator *build_array_declarator (location_t, tree, 520 struct c_declspecs *, 521 bool, bool); 522 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *, 523 tree, tree); 524 extern tree check_for_loop_decls (location_t, bool); 525 extern void mark_forward_parm_decls (void); 526 extern void declare_parm_level (void); 527 extern void undeclared_variable (location_t, tree); 528 extern tree lookup_label_for_goto (location_t, tree); 529 extern tree declare_label (tree); 530 extern tree define_label (location_t, tree); 531 extern struct c_spot_bindings *c_get_switch_bindings (void); 532 extern void c_release_switch_bindings (struct c_spot_bindings *); 533 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *, 534 location_t, location_t); 535 extern void finish_decl (tree, location_t, tree, tree, tree); 536 extern tree finish_enum (tree, tree, tree); 537 extern void finish_function (void); 538 extern tree finish_struct (location_t, tree, tree, tree, 539 struct c_struct_parse_info *); 540 extern struct c_arg_info *build_arg_info (void); 541 extern struct c_arg_info *get_parm_info (bool, tree); 542 extern tree grokfield (location_t, struct c_declarator *, 543 struct c_declspecs *, tree, tree *); 544 extern tree groktypename (struct c_type_name *, tree *, bool *); 545 extern tree grokparm (const struct c_parm *, tree *); 546 extern tree implicitly_declare (location_t, tree); 547 extern void keep_next_level (void); 548 extern void pending_xref_error (void); 549 extern void c_push_function_context (void); 550 extern void c_pop_function_context (void); 551 extern void push_parm_decl (const struct c_parm *, tree *); 552 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *, 553 struct c_declarator *); 554 extern tree c_builtin_function (tree); 555 extern tree c_builtin_function_ext_scope (tree); 556 extern void shadow_tag (const struct c_declspecs *); 557 extern void shadow_tag_warned (const struct c_declspecs *, int); 558 extern tree start_enum (location_t, struct c_enum_contents *, tree); 559 extern int start_function (struct c_declspecs *, struct c_declarator *, tree); 560 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool, 561 tree); 562 extern tree start_struct (location_t, enum tree_code, tree, 563 struct c_struct_parse_info **); 564 extern void store_parm_decls (void); 565 extern void store_parm_decls_from (struct c_arg_info *); 566 extern void temp_store_parm_decls (tree, tree); 567 extern void temp_pop_parm_decls (void); 568 extern tree xref_tag (enum tree_code, tree); 569 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree); 570 extern struct c_parm *build_c_parm (struct c_declspecs *, tree, 571 struct c_declarator *); 572 extern struct c_declarator *build_attrs_declarator (tree, 573 struct c_declarator *); 574 extern struct c_declarator *build_function_declarator (struct c_arg_info *, 575 struct c_declarator *); 576 extern struct c_declarator *build_id_declarator (tree); 577 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *, 578 struct c_declarator *); 579 extern struct c_declspecs *build_null_declspecs (void); 580 extern struct c_declspecs *declspecs_add_qual (source_location, 581 struct c_declspecs *, tree); 582 extern struct c_declspecs *declspecs_add_type (location_t, 583 struct c_declspecs *, 584 struct c_typespec); 585 extern struct c_declspecs *declspecs_add_scspec (source_location, 586 struct c_declspecs *, tree); 587 extern struct c_declspecs *declspecs_add_attrs (source_location, 588 struct c_declspecs *, tree); 589 extern struct c_declspecs *declspecs_add_addrspace (source_location, 590 struct c_declspecs *, 591 addr_space_t); 592 extern struct c_declspecs *declspecs_add_alignas (source_location, 593 struct c_declspecs *, tree); 594 extern struct c_declspecs *finish_declspecs (struct c_declspecs *); 595 596 /* in c-objc-common.c */ 597 extern bool c_objc_common_init (void); 598 extern bool c_missing_noreturn_ok_p (tree); 599 extern bool c_warn_unused_global_decl (const_tree); 600 extern void c_initialize_diagnostics (diagnostic_context *); 601 extern bool c_vla_unspec_p (tree x, tree fn); 602 603 /* in c-typeck.c */ 604 extern int in_alignof; 605 extern int in_sizeof; 606 extern int in_typeof; 607 608 extern tree c_last_sizeof_arg; 609 610 extern struct c_switch *c_switch_stack; 611 612 extern tree c_objc_common_truthvalue_conversion (location_t, tree); 613 extern tree require_complete_type (location_t, tree); 614 extern int same_translation_unit_p (const_tree, const_tree); 615 extern int comptypes (tree, tree); 616 extern int comptypes_check_different_types (tree, tree, bool *); 617 extern bool c_vla_type_p (const_tree); 618 extern bool c_mark_addressable (tree, bool = false); 619 extern void c_incomplete_type_error (location_t, const_tree, const_tree); 620 extern tree c_type_promotes_to (tree); 621 extern struct c_expr default_function_array_conversion (location_t, 622 struct c_expr); 623 extern struct c_expr default_function_array_read_conversion (location_t, 624 struct c_expr); 625 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr, 626 bool, bool); 627 extern void mark_exp_read (tree); 628 extern tree composite_type (tree, tree); 629 extern tree build_component_ref (location_t, tree, tree, location_t); 630 extern tree build_array_ref (location_t, tree, tree); 631 extern tree build_external_ref (location_t, tree, int, tree *); 632 extern void pop_maybe_used (bool); 633 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr); 634 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *); 635 extern struct c_expr parser_build_unary_op (location_t, enum tree_code, 636 struct c_expr); 637 extern struct c_expr parser_build_binary_op (location_t, 638 enum tree_code, struct c_expr, 639 struct c_expr); 640 extern tree build_conditional_expr (location_t, tree, bool, tree, tree, 641 tree, tree); 642 extern tree build_compound_expr (location_t, tree, tree); 643 extern tree c_cast_expr (location_t, struct c_type_name *, tree); 644 extern tree build_c_cast (location_t, tree, tree); 645 extern void store_init_value (location_t, tree, tree, tree); 646 extern void maybe_warn_string_init (location_t, tree, struct c_expr); 647 extern void start_init (tree, tree, int, rich_location *); 648 extern void finish_init (void); 649 extern void really_start_incremental_init (tree); 650 extern void finish_implicit_inits (location_t, struct obstack *); 651 extern void push_init_level (location_t, int, struct obstack *); 652 extern struct c_expr pop_init_level (location_t, int, struct obstack *, 653 location_t); 654 extern void set_init_index (location_t, tree, tree, struct obstack *); 655 extern void set_init_label (location_t, tree, location_t, struct obstack *); 656 extern void process_init_element (location_t, struct c_expr, bool, 657 struct obstack *); 658 extern tree build_compound_literal (location_t, tree, tree, bool); 659 extern void check_compound_literal_type (location_t, struct c_type_name *); 660 extern tree c_start_case (location_t, location_t, tree, bool); 661 extern void c_finish_case (tree, tree); 662 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool, 663 bool); 664 extern tree build_asm_stmt (bool, tree); 665 extern int c_types_compatible_p (tree, tree); 666 extern tree c_begin_compound_stmt (bool); 667 extern tree c_end_compound_stmt (location_t, tree, bool); 668 extern void c_finish_if_stmt (location_t, tree, tree, tree); 669 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool); 670 extern tree c_begin_stmt_expr (void); 671 extern tree c_finish_stmt_expr (location_t, tree); 672 extern tree c_process_expr_stmt (location_t, tree); 673 extern tree c_finish_expr_stmt (location_t, tree); 674 extern tree c_finish_return (location_t, tree, tree); 675 extern tree c_finish_bc_stmt (location_t, tree *, bool); 676 extern tree c_finish_goto_label (location_t, tree); 677 extern tree c_finish_goto_ptr (location_t, tree); 678 extern tree c_expr_to_decl (tree, bool *, bool *); 679 extern tree c_finish_omp_construct (location_t, enum tree_code, tree, tree); 680 extern tree c_finish_oacc_data (location_t, tree, tree); 681 extern tree c_finish_oacc_host_data (location_t, tree, tree); 682 extern tree c_begin_omp_parallel (void); 683 extern tree c_finish_omp_parallel (location_t, tree, tree); 684 extern tree c_begin_omp_task (void); 685 extern tree c_finish_omp_task (location_t, tree, tree); 686 extern void c_finish_omp_cancel (location_t, tree); 687 extern void c_finish_omp_cancellation_point (location_t, tree); 688 extern tree c_finish_omp_clauses (tree, enum c_omp_region_type); 689 extern tree c_build_va_arg (location_t, tree, location_t, tree); 690 extern tree c_finish_transaction (location_t, tree, int); 691 extern bool c_tree_equal (tree, tree); 692 extern tree c_build_function_call_vec (location_t, vec<location_t>, tree, 693 vec<tree, va_gc> *, vec<tree, va_gc> *); 694 extern tree c_omp_clause_copy_ctor (tree, tree, tree); 695 696 /* Set to 0 at beginning of a function definition, set to 1 if 697 a return statement that specifies a return value is seen. */ 698 699 extern int current_function_returns_value; 700 701 /* Set to 0 at beginning of a function definition, set to 1 if 702 a return statement with no argument is seen. */ 703 704 extern int current_function_returns_null; 705 706 /* Set to 0 at beginning of a function definition, set to 1 if 707 a call to a noreturn function is seen. */ 708 709 extern int current_function_returns_abnormally; 710 711 /* In c-decl.c */ 712 713 /* Tell the binding oracle what kind of binding we are looking for. */ 714 715 enum c_oracle_request 716 { 717 C_ORACLE_SYMBOL, 718 C_ORACLE_TAG, 719 C_ORACLE_LABEL 720 }; 721 722 /* If this is non-NULL, then it is a "binding oracle" which can lazily 723 create bindings when needed by the C compiler. The oracle is told 724 the name and type of the binding to create. It can call pushdecl 725 or the like to ensure the binding is visible; or do nothing, 726 leaving the binding untouched. c-decl.c takes note of when the 727 oracle has been called and will not call it again if it fails to 728 create a given binding. */ 729 730 typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier); 731 732 extern c_binding_oracle_function *c_binding_oracle; 733 734 extern void c_finish_incomplete_decl (tree); 735 extern tree c_omp_reduction_id (enum tree_code, tree); 736 extern tree c_omp_reduction_decl (tree); 737 extern tree c_omp_reduction_lookup (tree, tree); 738 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *); 739 extern void c_pushtag (location_t, tree, tree); 740 extern void c_bind (location_t, tree, bool); 741 extern bool tag_exists_p (enum tree_code, tree); 742 743 /* In c-errors.c */ 744 extern bool pedwarn_c90 (location_t, int opt, const char *, ...) 745 ATTRIBUTE_GCC_DIAG(3,4); 746 extern bool pedwarn_c99 (location_t, int opt, const char *, ...) 747 ATTRIBUTE_GCC_DIAG(3,4); 748 749 extern void 750 set_c_expr_source_range (c_expr *expr, 751 location_t start, location_t finish); 752 753 extern void 754 set_c_expr_source_range (c_expr *expr, 755 source_range src_range); 756 757 /* In c-fold.c */ 758 extern tree decl_constant_value_for_optimization (tree); 759 760 extern vec<tree> incomplete_record_decls; 761 762 #endif /* ! GCC_C_TREE_H */ 763