c-tree.h revision 189824
168651Skris/* Definitions for C parsing and type checking. 268651Skris Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998, 368651Skris 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. 468651Skris 568651SkrisThis file is part of GCC. 668651Skris 768651SkrisGCC is free software; you can redistribute it and/or modify it under 868651Skristhe terms of the GNU General Public License as published by the Free 968651SkrisSoftware Foundation; either version 2, or (at your option) any later 1068651Skrisversion. 11160814Ssimon 1268651SkrisGCC is distributed in the hope that it will be useful, but WITHOUT ANY 1368651SkrisWARRANTY; without even the implied warranty of MERCHANTABILITY or 1468651SkrisFITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1568651Skrisfor more details. 1668651Skris 1768651SkrisYou should have received a copy of the GNU General Public License 1876866Skrisalong with GCC; see the file COPYING. If not, write to the Free 1968651SkrisSoftware Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 2068651Skris02110-1301, USA. */ 2168651Skris 2268651Skris#ifndef GCC_C_TREE_H 2368651Skris#define GCC_C_TREE_H 2468651Skris 2568651Skris#include "c-common.h" 2668651Skris#include "toplev.h" 2768651Skris#include "diagnostic.h" 2868651Skris 2968651Skris/* struct lang_identifier is private to c-decl.c, but langhooks.c needs to 3068651Skris know how big it is. This is sanity-checked in c-decl.c. */ 3168651Skris#define C_SIZEOF_STRUCT_LANG_IDENTIFIER \ 3268651Skris (sizeof (struct c_common_identifier) + 3 * sizeof (void *)) 3368651Skris 3468651Skris/* Language-specific declaration information. */ 3568651Skris 3668651Skrisstruct lang_decl GTY(()) 3768651Skris{ 3868651Skris char dummy; 3968651Skris}; 4068651Skris 4168651Skris/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */ 4268651Skris#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE) 4368651Skris 4468651Skris/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */ 4568651Skris#define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE) 4668651Skris 4768651Skris/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE 4868651Skris nonzero if the definition of the type has already started. */ 4968651Skris#define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE) 5068651Skris 5168651Skris/* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable 5268651Skris declarations whose type would be completed by completing that type. */ 53#define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE) 54 55/* In an IDENTIFIER_NODE, nonzero if this identifier is actually a 56 keyword. C_RID_CODE (node) is then the RID_* value of the keyword, 57 and C_RID_YYCODE is the token number wanted by Yacc. */ 58#define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID) 59 60struct lang_type GTY(()) 61{ 62 /* In a RECORD_TYPE, a sorted array of the fields of the type. */ 63 struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s; 64 /* In an ENUMERAL_TYPE, the min and max values. */ 65 tree enum_min; 66 tree enum_max; 67 /* In a RECORD_TYPE, information specific to Objective-C, such 68 as a list of adopted protocols or a pointer to a corresponding 69 @interface. See objc/objc-act.h for details. */ 70 tree objc_info; 71}; 72 73/* Record whether a type or decl was written with nonconstant size. 74 Note that TYPE_SIZE may have simplified to a constant. */ 75#define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE) 76#define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE) 77 78/* Record whether a typedef for type `int' was actually `signed int'. */ 79#define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP) 80 81/* For a FUNCTION_DECL, nonzero if it was defined without an explicit 82 return type. */ 83#define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP) 84 85/* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */ 86#define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP) 87 88/* For FUNCTION_DECLs, evaluates true if the decl is built-in but has 89 been declared. */ 90#define C_DECL_DECLARED_BUILTIN(EXP) \ 91 DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP)) 92 93/* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a 94 built-in prototype and does not have a non-built-in prototype. */ 95#define C_DECL_BUILTIN_PROTOTYPE(EXP) \ 96 DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP)) 97 98/* Record whether a decl was declared register. This is strictly a 99 front-end flag, whereas DECL_REGISTER is used for code generation; 100 they may differ for structures with volatile fields. */ 101#define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP) 102 103/* Record whether a decl was used in an expression anywhere except an 104 unevaluated operand of sizeof / typeof / alignof. This is only 105 used for functions declared static but not defined, though outside 106 sizeof and typeof it is set for other function decls as well. */ 107#define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP)) 108 109/* Record whether a label was defined in a statement expression which 110 has finished and so can no longer be jumped to. */ 111#define C_DECL_UNJUMPABLE_STMT_EXPR(EXP) \ 112 DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP)) 113 114/* Record whether a label was the subject of a goto from outside the 115 current level of statement expression nesting and so cannot be 116 defined right now. */ 117#define C_DECL_UNDEFINABLE_STMT_EXPR(EXP) \ 118 DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP)) 119 120/* Record whether a label was defined in the scope of an identifier 121 with variably modified type which has finished and so can no longer 122 be jumped to. */ 123#define C_DECL_UNJUMPABLE_VM(EXP) \ 124 DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP)) 125 126/* Record whether a label was the subject of a goto from outside the 127 current level of scopes of identifiers with variably modified type 128 and so cannot be defined right now. */ 129#define C_DECL_UNDEFINABLE_VM(EXP) \ 130 DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP)) 131 132/* Record whether a variable has been declared threadprivate by 133 #pragma omp threadprivate. */ 134#define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL)) 135 136/* Nonzero for a decl which either doesn't exist or isn't a prototype. 137 N.B. Could be simplified if all built-in decls had complete prototypes 138 (but this is presently difficult because some of them need FILE*). */ 139#define C_DECL_ISNT_PROTOTYPE(EXP) \ 140 (EXP == 0 \ 141 || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0 \ 142 && !DECL_BUILT_IN (EXP))) 143 144/* For FUNCTION_TYPE, a hidden list of types of arguments. The same as 145 TYPE_ARG_TYPES for functions with prototypes, but created for functions 146 without prototypes. */ 147#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE) 148 149/* Record parser information about an expression that is irrelevant 150 for code generation alongside a tree representing its value. */ 151struct c_expr 152{ 153 /* The value of the expression. */ 154 tree value; 155 /* Record the original binary operator of an expression, which may 156 have been changed by fold, STRING_CST for unparenthesized string 157 constants, or ERROR_MARK for other expressions (including 158 parenthesized expressions). */ 159 enum tree_code original_code; 160}; 161 162/* A kind of type specifier. Note that this information is currently 163 only used to distinguish tag definitions, tag references and typeof 164 uses. */ 165enum c_typespec_kind { 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. */ 183 ctsk_typeof 184}; 185 186/* A type specifier: this structure is created in the parser and 187 passed to declspecs_add_type only. */ 188struct c_typespec { 189 /* What kind of type specifier this is. */ 190 enum c_typespec_kind kind; 191 /* The specifier itself. */ 192 tree spec; 193}; 194 195/* A storage class specifier. */ 196enum c_storage_class { 197 csc_none, 198 csc_auto, 199 csc_extern, 200 csc_register, 201 csc_static, 202 csc_typedef 203}; 204 205/* A type specifier keyword "void", "_Bool", "char", "int", "float", 206 "double", or none of these. */ 207enum c_typespec_keyword { 208 cts_none, 209 cts_void, 210 cts_bool, 211 cts_char, 212 cts_int, 213 cts_float, 214 cts_double, 215 cts_dfloat32, 216 cts_dfloat64, 217 cts_dfloat128 218}; 219 220/* A sequence of declaration specifiers in C. */ 221struct c_declspecs { 222 /* The type specified, if a single type specifier such as a struct, 223 union or enum specifier, typedef name or typeof specifies the 224 whole type, or NULL_TREE if none or a keyword such as "void" or 225 "char" is used. Does not include qualifiers. */ 226 tree type; 227 /* The attributes from a typedef decl. */ 228 tree decl_attr; 229 /* When parsing, the attributes. Outside the parser, this will be 230 NULL; attributes (possibly from multiple lists) will be passed 231 separately. */ 232 tree attrs; 233 /* Any type specifier keyword used such as "int", not reflecting 234 modifiers such as "short", or cts_none if none. */ 235 enum c_typespec_keyword typespec_word; 236 /* The storage class specifier, or csc_none if none. */ 237 enum c_storage_class storage_class; 238 /* Whether any declaration specifiers have been seen at all. */ 239 BOOL_BITFIELD declspecs_seen_p : 1; 240 /* Whether a type specifier has been seen. */ 241 BOOL_BITFIELD type_seen_p : 1; 242 /* Whether something other than a storage class specifier or 243 attribute has been seen. This is used to warn for the 244 obsolescent usage of storage class specifiers other than at the 245 start of the list. (Doing this properly would require function 246 specifiers to be handled separately from storage class 247 specifiers.) */ 248 BOOL_BITFIELD non_sc_seen_p : 1; 249 /* Whether the type is specified by a typedef or typeof name. */ 250 BOOL_BITFIELD typedef_p : 1; 251 /* Whether a struct, union or enum type either had its content 252 defined by a type specifier in the list or was the first visible 253 declaration of its tag. */ 254 BOOL_BITFIELD tag_defined_p : 1; 255 /* Whether the type is explicitly "signed" or specified by a typedef 256 whose type is explicitly "signed". */ 257 BOOL_BITFIELD explicit_signed_p : 1; 258 /* Whether the specifiers include a deprecated typedef. */ 259 BOOL_BITFIELD deprecated_p : 1; 260 /* Whether the type defaulted to "int" because there were no type 261 specifiers. */ 262 BOOL_BITFIELD default_int_p; 263 /* Whether "long" was specified. */ 264 BOOL_BITFIELD long_p : 1; 265 /* Whether "long" was specified more than once. */ 266 BOOL_BITFIELD long_long_p : 1; 267 /* Whether "short" was specified. */ 268 BOOL_BITFIELD short_p : 1; 269 /* Whether "signed" was specified. */ 270 BOOL_BITFIELD signed_p : 1; 271 /* Whether "unsigned" was specified. */ 272 BOOL_BITFIELD unsigned_p : 1; 273 /* Whether "complex" was specified. */ 274 BOOL_BITFIELD complex_p : 1; 275 /* Whether "inline" was specified. */ 276 BOOL_BITFIELD inline_p : 1; 277 /* Whether "__thread" was specified. */ 278 BOOL_BITFIELD thread_p : 1; 279 /* Whether "const" was specified. */ 280 BOOL_BITFIELD const_p : 1; 281 /* Whether "volatile" was specified. */ 282 BOOL_BITFIELD volatile_p : 1; 283 /* Whether "restrict" was specified. */ 284 BOOL_BITFIELD restrict_p : 1; 285}; 286 287/* The various kinds of declarators in C. */ 288enum c_declarator_kind { 289 /* An identifier. */ 290 cdk_id, 291 /* A function. */ 292 cdk_function, 293 /* An array. */ 294 cdk_array, 295 /* A pointer. */ 296 cdk_pointer, 297 /* Parenthesized declarator with nested attributes. */ 298 cdk_attrs 299}; 300 301/* Information about the parameters in a function declarator. */ 302struct c_arg_info { 303 /* A list of parameter decls. */ 304 tree parms; 305 /* A list of structure, union and enum tags defined. */ 306 tree tags; 307 /* A list of argument types to go in the FUNCTION_TYPE. */ 308 tree types; 309 /* A list of non-parameter decls (notably enumeration constants) 310 defined with the parameters. */ 311 tree others; 312 /* A list of VLA sizes from the parameters. In a function 313 definition, these are used to ensure that side-effects in sizes 314 of arrays converted to pointers (such as a parameter int i[n++]) 315 take place; otherwise, they are ignored. */ 316 tree pending_sizes; 317 /* True when these arguments had [*]. */ 318 BOOL_BITFIELD had_vla_unspec : 1; 319}; 320 321/* A declarator. */ 322struct c_declarator { 323 /* The kind of declarator. */ 324 enum c_declarator_kind kind; 325 /* Except for cdk_id, the contained declarator. For cdk_id, NULL. */ 326 struct c_declarator *declarator; 327 location_t id_loc; /* Currently only set for cdk_id. */ 328 union { 329 /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract 330 declarator. */ 331 tree id; 332 /* For functions. */ 333 struct c_arg_info *arg_info; 334 /* For arrays. */ 335 struct { 336 /* The array dimension, or NULL for [] and [*]. */ 337 tree dimen; 338 /* The qualifiers inside []. */ 339 int quals; 340 /* The attributes (currently ignored) inside []. */ 341 tree attrs; 342 /* Whether [static] was used. */ 343 BOOL_BITFIELD static_p : 1; 344 /* Whether [*] was used. */ 345 BOOL_BITFIELD vla_unspec_p : 1; 346 } array; 347 /* For pointers, the qualifiers on the pointer type. */ 348 int pointer_quals; 349 /* For attributes. */ 350 tree attrs; 351 } u; 352}; 353 354/* A type name. */ 355struct c_type_name { 356 /* The declaration specifiers. */ 357 struct c_declspecs *specs; 358 /* The declarator. */ 359 struct c_declarator *declarator; 360}; 361 362/* A parameter. */ 363struct c_parm { 364 /* The declaration specifiers, minus any prefix attributes. */ 365 struct c_declspecs *specs; 366 /* The attributes. */ 367 tree attrs; 368 /* The declarator. */ 369 struct c_declarator *declarator; 370}; 371 372/* Save and restore the variables in this file and elsewhere 373 that keep track of the progress of compilation of the current function. 374 Used for nested functions. */ 375 376struct language_function GTY(()) 377{ 378 struct c_language_function base; 379 tree x_break_label; 380 tree x_cont_label; 381 struct c_switch * GTY((skip)) x_switch_stack; 382 struct c_arg_info * GTY((skip)) arg_info; 383 int returns_value; 384 int returns_null; 385 int returns_abnormally; 386 int warn_about_return_type; 387}; 388 389/* Save lists of labels used or defined in particular contexts. 390 Allocated on the parser obstack. */ 391 392struct c_label_list 393{ 394 /* The label at the head of the list. */ 395 tree label; 396 /* The rest of the list. */ 397 struct c_label_list *next; 398}; 399 400/* Statement expression context. */ 401 402struct c_label_context_se 403{ 404 /* The labels defined at this level of nesting. */ 405 struct c_label_list *labels_def; 406 /* The labels used at this level of nesting. */ 407 struct c_label_list *labels_used; 408 /* The next outermost context. */ 409 struct c_label_context_se *next; 410}; 411 412/* Context of variably modified declarations. */ 413 414struct c_label_context_vm 415{ 416 /* The labels defined at this level of nesting. */ 417 struct c_label_list *labels_def; 418 /* The labels used at this level of nesting. */ 419 struct c_label_list *labels_used; 420 /* The scope of this context. Multiple contexts may be at the same 421 numbered scope, since each variably modified declaration starts a 422 new context. */ 423 unsigned scope; 424 /* The next outermost context. */ 425 struct c_label_context_vm *next; 426}; 427 428 429/* in c-parser.c */ 430extern void c_parse_init (void); 431 432/* in c-aux-info.c */ 433extern void gen_aux_info_record (tree, int, int, int); 434 435/* in c-decl.c */ 436extern struct obstack parser_obstack; 437extern tree c_break_label; 438extern tree c_cont_label; 439 440extern int global_bindings_p (void); 441extern void push_scope (void); 442extern tree pop_scope (void); 443extern void insert_block (tree); 444extern void c_expand_body (tree); 445 446extern void c_init_decl_processing (void); 447extern void c_dup_lang_specific_decl (tree); 448extern void c_print_identifier (FILE *, tree, int); 449extern int quals_from_declspecs (const struct c_declspecs *); 450extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *, 451 bool, bool); 452extern tree build_enumerator (tree, tree); 453extern tree check_for_loop_decls (void); 454extern void mark_forward_parm_decls (void); 455extern void declare_parm_level (void); 456extern void undeclared_variable (tree, location_t); 457extern tree declare_label (tree); 458extern tree define_label (location_t, tree); 459extern void c_maybe_initialize_eh (void); 460extern void finish_decl (tree, tree, tree); 461extern tree finish_enum (tree, tree, tree); 462extern void finish_function (void); 463extern tree finish_struct (tree, tree, tree); 464extern struct c_arg_info *get_parm_info (bool); 465extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree); 466extern tree groktypename (struct c_type_name *); 467extern tree grokparm (const struct c_parm *); 468extern tree implicitly_declare (tree); 469extern void keep_next_level (void); 470extern void pending_xref_error (void); 471extern void c_push_function_context (struct function *); 472extern void c_pop_function_context (struct function *); 473extern void push_parm_decl (const struct c_parm *); 474extern struct c_declarator *set_array_declarator_inner (struct c_declarator *, 475 struct c_declarator *, 476 bool); 477extern tree builtin_function (const char *, tree, int, enum built_in_class, 478 const char *, tree); 479extern void shadow_tag (const struct c_declspecs *); 480extern void shadow_tag_warned (const struct c_declspecs *, int); 481extern tree start_enum (tree); 482extern int start_function (struct c_declspecs *, struct c_declarator *, tree); 483extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool, 484 tree); 485extern tree start_struct (enum tree_code, tree); 486extern void store_parm_decls (void); 487extern void store_parm_decls_from (struct c_arg_info *); 488extern tree xref_tag (enum tree_code, tree); 489extern struct c_typespec parser_xref_tag (enum tree_code, tree); 490extern int c_expand_decl (tree); 491extern struct c_parm *build_c_parm (struct c_declspecs *, tree, 492 struct c_declarator *); 493extern struct c_declarator *build_attrs_declarator (tree, 494 struct c_declarator *); 495extern struct c_declarator *build_function_declarator (struct c_arg_info *, 496 struct c_declarator *); 497extern struct c_declarator *build_id_declarator (tree); 498extern struct c_declarator *make_pointer_declarator (struct c_declspecs *, 499 struct c_declarator *); 500extern struct c_declspecs *build_null_declspecs (void); 501extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree); 502extern struct c_declspecs *declspecs_add_type (struct c_declspecs *, 503 struct c_typespec); 504extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree); 505extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree); 506extern struct c_declspecs *finish_declspecs (struct c_declspecs *); 507 508/* in c-objc-common.c */ 509extern int c_disregard_inline_limits (tree); 510extern int c_cannot_inline_tree_fn (tree *); 511extern bool c_objc_common_init (void); 512extern bool c_missing_noreturn_ok_p (tree); 513extern tree c_objc_common_truthvalue_conversion (tree expr); 514extern bool c_warn_unused_global_decl (tree); 515extern void c_initialize_diagnostics (diagnostic_context *); 516extern bool c_vla_unspec_p (tree x, tree fn); 517 518#define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \ 519 c_build_qualified_type ((TYPE), \ 520 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \ 521 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0)) 522 523/* in c-typeck.c */ 524extern int in_alignof; 525extern int in_sizeof; 526extern int in_typeof; 527 528extern struct c_switch *c_switch_stack; 529extern struct c_label_context_se *label_context_stack_se; 530extern struct c_label_context_vm *label_context_stack_vm; 531 532extern tree require_complete_type (tree); 533extern int same_translation_unit_p (tree, tree); 534extern int comptypes (tree, tree); 535extern bool c_vla_type_p (tree); 536extern bool c_mark_addressable (tree); 537extern void c_incomplete_type_error (tree, tree); 538extern tree c_type_promotes_to (tree); 539extern struct c_expr default_function_array_conversion (struct c_expr); 540extern tree composite_type (tree, tree); 541extern tree build_component_ref (tree, tree); 542extern tree build_array_ref (tree, tree); 543extern tree build_external_ref (tree, int, location_t); 544extern void pop_maybe_used (bool); 545extern struct c_expr c_expr_sizeof_expr (struct c_expr); 546extern struct c_expr c_expr_sizeof_type (struct c_type_name *); 547extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr); 548extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr, 549 struct c_expr); 550extern tree build_conditional_expr (tree, tree, tree); 551extern tree build_compound_expr (tree, tree); 552extern tree c_cast_expr (struct c_type_name *, tree); 553extern tree build_c_cast (tree, tree); 554extern void store_init_value (tree, tree); 555extern void error_init (const char *); 556extern void pedwarn_init (const char *); 557extern void maybe_warn_string_init (tree, struct c_expr); 558extern void start_init (tree, tree, int); 559extern void finish_init (void); 560extern void really_start_incremental_init (tree); 561extern void push_init_level (int); 562extern struct c_expr pop_init_level (int); 563extern void set_init_index (tree, tree); 564extern void set_init_label (tree); 565extern void process_init_element (struct c_expr); 566extern tree build_compound_literal (tree, tree); 567extern tree c_start_case (tree); 568extern void c_finish_case (tree); 569extern tree build_asm_expr (tree, tree, tree, tree, bool); 570extern tree build_asm_stmt (tree, tree); 571extern tree c_convert_parm_for_inlining (tree, tree, tree, int); 572extern int c_types_compatible_p (tree, tree); 573extern tree c_begin_compound_stmt (bool); 574extern tree c_end_compound_stmt (tree, bool); 575extern void c_finish_if_stmt (location_t, tree, tree, tree, bool); 576extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool); 577extern tree c_begin_stmt_expr (void); 578extern tree c_finish_stmt_expr (tree); 579extern tree c_process_expr_stmt (tree); 580extern tree c_finish_expr_stmt (tree); 581extern tree c_finish_return (tree); 582extern tree c_finish_bc_stmt (tree *, bool); 583extern tree c_finish_goto_label (tree); 584extern tree c_finish_goto_ptr (tree); 585extern void c_begin_vm_scope (unsigned int); 586extern void c_end_vm_scope (unsigned int); 587extern tree c_expr_to_decl (tree, bool *, bool *, bool *); 588extern tree c_begin_omp_parallel (void); 589extern tree c_finish_omp_parallel (tree, tree); 590extern tree c_finish_omp_clauses (tree); 591 592/* Set to 0 at beginning of a function definition, set to 1 if 593 a return statement that specifies a return value is seen. */ 594 595extern int current_function_returns_value; 596 597/* Set to 0 at beginning of a function definition, set to 1 if 598 a return statement with no argument is seen. */ 599 600extern int current_function_returns_null; 601 602/* Set to 0 at beginning of a function definition, set to 1 if 603 a call to a noreturn function is seen. */ 604 605extern int current_function_returns_abnormally; 606 607/* Nonzero means we are reading code that came from a system header file. */ 608 609extern int system_header_p; 610 611/* True means global_bindings_p should return false even if the scope stack 612 says we are in file scope. */ 613 614extern bool c_override_global_bindings_to_false; 615 616/* True means we've initialized exception handling. */ 617extern bool c_eh_initialized_p; 618 619/* In c-decl.c */ 620extern void c_finish_incomplete_decl (tree); 621extern void c_write_global_declarations (void); 622 623/* In order for the format checking to accept the C frontend 624 diagnostic framework extensions, you must include this file before 625 toplev.h, not after. */ 626#if GCC_VERSION >= 4001 627#define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m) 628#else 629#define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m) 630#endif 631 632extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2); 633extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2); 634 635#endif /* ! GCC_C_TREE_H */ 636