gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_C_TREE_H
  23 #define GCC_C_TREE_H
  24
  25 #include "c-common.h"
  26 #include "toplev.h"
  27 #include "diagnostic.h"
  28
  29 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  30    know how big it is.  This is sanity-checked in c-decl.c.  */
  31 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  32   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  33
  34 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  35 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  36
  37 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  38 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  39
  40 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  41    nonzero if the definition of the type has already started.  */
  42 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  43
  44 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  45    declarations whose type would be completed by completing that type.  */
  46 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (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    and C_RID_YYCODE is the token number wanted by Yacc.  */
  51 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  52
  53 /* Record whether a type or decl was written with nonconstant size.
  54    Note that TYPE_SIZE may have simplified to a constant.  */
  55 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  56 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  57
  58 /* Record whether a type is defined inside a struct or union type.
  59    This is used for -Wc++-compat. */
  60 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  61
  62 /* Record whether a typedef for type `int' was actually `signed int'.  */
  63 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  64
  65 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  66    return type.  */
  67 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  68
  69 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  70 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  71
  72 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  73    been declared.  */
  74 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  75   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  76
  77 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  78    built-in prototype and does not have a non-built-in prototype.  */
  79 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  80   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  81
  82 /* Record whether a decl was declared register.  This is strictly a
  83    front-end flag, whereas DECL_REGISTER is used for code generation;
  84    they may differ for structures with volatile fields.  */
  85 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  86
  87 /* Record whether a decl was used in an expression anywhere except an
  88    unevaluated operand of sizeof / typeof / alignof.  This is only
  89    used for functions declared static but not defined, though outside
  90    sizeof and typeof it is set for other function decls as well.  */
  91 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  92
  93 /* Record whether a variable has been declared threadprivate by
  94    #pragma omp threadprivate.  */
  95 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  96
  97 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
  98    N.B. Could be simplified if all built-in decls had complete prototypes
  99    (but this is presently difficult because some of them need FILE*).  */
 100 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 101        (EXP == 0                                        \
 102         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 103             && !DECL_BUILT_IN (EXP)))
 104
 105 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 106    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 107    without prototypes.  */
 108 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 109
 110 /* For a CONSTRUCTOR, whether some initializer contains a
 111    subexpression meaning it is not a constant expression.  */
 112 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 113
 114 /* Record parser information about an expression that is irrelevant
 115    for code generation alongside a tree representing its value.  */
 116 struct c_expr
 117 {
 118   /* The value of the expression.  */
 119   tree value;
 120   /* Record the original unary/binary operator of an expression, which may
 121      have been changed by fold, STRING_CST for unparenthesized string
 122      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 123      (even if parenthesized), for subexpressions, and for non-constant
 124      initializers, or ERROR_MARK for other expressions (including
 125      parenthesized expressions).  */
 126   enum tree_code original_code;
 127   /* If not NULL, the original type of an expression.  This will
 128      differ from the type of the value field for an enum constant.
 129      The type of an enum constant is a plain integer type, but this
 130      field will be the enum type.  */
 131   tree original_type;
 132 };
 133
 134 /* A kind of type specifier.  Note that this information is currently
 135    only used to distinguish tag definitions, tag references and typeof
 136    uses.  */
 137 enum c_typespec_kind {
 138   /* A reserved keyword type specifier.  */
 139   ctsk_resword,
 140   /* A reference to a tag, previously declared, such as "struct foo".
 141      This includes where the previous declaration was as a different
 142      kind of tag, in which case this is only valid if shadowing that
 143      tag in an inner scope.  */
 144   ctsk_tagref,
 145   /* A reference to a tag, not previously declared in a visible
 146      scope.  */
 147   ctsk_tagfirstref,
 148   /* A definition of a tag such as "struct foo { int a; }".  */
 149   ctsk_tagdef,
 150   /* A typedef name.  */
 151   ctsk_typedef,
 152   /* An ObjC-specific kind of type specifier.  */
 153   ctsk_objc,
 154   /* A typeof specifier.  */
 155   ctsk_typeof
 156 };
 157
 158 /* A type specifier: this structure is created in the parser and
 159    passed to declspecs_add_type only.  */
 160 struct c_typespec {
 161   /* What kind of type specifier this is.  */
 162   enum c_typespec_kind kind;
 163   /* The specifier itself.  */
 164   tree spec;
 165   /* An expression to be evaluated before the type specifier, in the
 166      case of typeof specifiers, or NULL otherwise or if no such
 167      expression is required for a particular typeof specifier.  In
 168      particular, when typeof is applied to an expression of variably
 169      modified type, that expression must be evaluated in order to
 170      determine array sizes that form part of the type, but the
 171      expression itself (as opposed to the array sizes) forms no part
 172      of the type and so needs to be recorded separately.  */
 173   tree expr;
 174   /* Whether the expression has operands suitable for use in constant
 175      expressions.  */
 176   bool expr_const_operands;
 177 };
 178
 179 /* A storage class specifier.  */
 180 enum c_storage_class {
 181   csc_none,
 182   csc_auto,
 183   csc_extern,
 184   csc_register,
 185   csc_static,
 186   csc_typedef
 187 };
 188
 189 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 190    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 191    or none of these.  */
 192 enum c_typespec_keyword {
 193   cts_none,
 194   cts_void,
 195   cts_bool,
 196   cts_char,
 197   cts_int,
 198   cts_float,
 199   cts_double,
 200   cts_dfloat32,
 201   cts_dfloat64,
 202   cts_dfloat128,
 203   cts_fract,
 204   cts_accum
 205 };
 206
 207 /* A sequence of declaration specifiers in C.  */
 208 struct c_declspecs {
 209   /* The type specified, if a single type specifier such as a struct,
 210      union or enum specifier, typedef name or typeof specifies the
 211      whole type, or NULL_TREE if none or a keyword such as "void" or
 212      "char" is used.  Does not include qualifiers.  */
 213   tree type;
 214   /* Any expression to be evaluated before the type, from a typeof
 215      specifier.  */
 216   tree expr;
 217   /* The attributes from a typedef decl.  */
 218   tree decl_attr;
 219   /* When parsing, the attributes.  Outside the parser, this will be
 220      NULL; attributes (possibly from multiple lists) will be passed
 221      separately.  */
 222   tree attrs;
 223   /* Any type specifier keyword used such as "int", not reflecting
 224      modifiers such as "short", or cts_none if none.  */
 225   enum c_typespec_keyword typespec_word;
 226   /* The storage class specifier, or csc_none if none.  */
 227   enum c_storage_class storage_class;
 228   /* Whether any expressions in typeof specifiers may appear in
 229      constant expressions.  */
 230   BOOL_BITFIELD expr_const_operands : 1;
 231   /* Whether any declaration specifiers have been seen at all.  */
 232   BOOL_BITFIELD declspecs_seen_p : 1;
 233   /* Whether a type specifier has been seen.  */
 234   BOOL_BITFIELD type_seen_p : 1;
 235   /* Whether something other than a storage class specifier or
 236      attribute has been seen.  This is used to warn for the
 237      obsolescent usage of storage class specifiers other than at the
 238      start of the list.  (Doing this properly would require function
 239      specifiers to be handled separately from storage class
 240      specifiers.)  */
 241   BOOL_BITFIELD non_sc_seen_p : 1;
 242   /* Whether the type is specified by a typedef or typeof name.  */
 243   BOOL_BITFIELD typedef_p : 1;
 244   /* Whether a struct, union or enum type either had its content
 245      defined by a type specifier in the list or was the first visible
 246      declaration of its tag.  */
 247   BOOL_BITFIELD tag_defined_p : 1;
 248   /* Whether the type is explicitly "signed" or specified by a typedef
 249      whose type is explicitly "signed".  */
 250   BOOL_BITFIELD explicit_signed_p : 1;
 251   /* Whether the specifiers include a deprecated typedef.  */
 252   BOOL_BITFIELD deprecated_p : 1;
 253   /* Whether the type defaulted to "int" because there were no type
 254      specifiers.  */
 255   BOOL_BITFIELD default_int_p;
 256   /* Whether "long" was specified.  */
 257   BOOL_BITFIELD long_p : 1;
 258   /* Whether "long" was specified more than once.  */
 259   BOOL_BITFIELD long_long_p : 1;
 260   /* Whether "short" was specified.  */
 261   BOOL_BITFIELD short_p : 1;
 262   /* Whether "signed" was specified.  */
 263   BOOL_BITFIELD signed_p : 1;
 264   /* Whether "unsigned" was specified.  */
 265   BOOL_BITFIELD unsigned_p : 1;
 266   /* Whether "complex" was specified.  */
 267   BOOL_BITFIELD complex_p : 1;
 268   /* Whether "inline" was specified.  */
 269   BOOL_BITFIELD inline_p : 1;
 270   /* Whether "__thread" was specified.  */
 271   BOOL_BITFIELD thread_p : 1;
 272   /* Whether "const" was specified.  */
 273   BOOL_BITFIELD const_p : 1;
 274   /* Whether "volatile" was specified.  */
 275   BOOL_BITFIELD volatile_p : 1;
 276   /* Whether "restrict" was specified.  */
 277   BOOL_BITFIELD restrict_p : 1;
 278   /* Whether "_Sat" was specified.  */
 279   BOOL_BITFIELD saturating_p : 1;
 280 };
 281
 282 /* The various kinds of declarators in C.  */
 283 enum c_declarator_kind {
 284   /* An identifier.  */
 285   cdk_id,
 286   /* A function.  */
 287   cdk_function,
 288   /* An array.  */
 289   cdk_array,
 290   /* A pointer.  */
 291   cdk_pointer,
 292   /* Parenthesized declarator with nested attributes.  */
 293   cdk_attrs
 294 };
 295
 296 /* Information about the parameters in a function declarator.  */
 297 struct c_arg_info {
 298   /* A list of parameter decls.  */
 299   tree parms;
 300   /* A list of structure, union and enum tags defined.  */
 301   tree tags;
 302   /* A list of argument types to go in the FUNCTION_TYPE.  */
 303   tree types;
 304   /* A list of non-parameter decls (notably enumeration constants)
 305      defined with the parameters.  */
 306   tree others;
 307   /* A list of VLA sizes from the parameters.  In a function
 308      definition, these are used to ensure that side-effects in sizes
 309      of arrays converted to pointers (such as a parameter int i[n++])
 310      take place; otherwise, they are ignored.  */
 311   tree pending_sizes;
 312   /* True when these arguments had [*].  */
 313   BOOL_BITFIELD had_vla_unspec : 1;
 314 };
 315
 316 /* A declarator.  */
 317 struct c_declarator {
 318   /* The kind of declarator.  */
 319   enum c_declarator_kind kind;
 320   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 321   struct c_declarator *declarator;
 322   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 323   union {
 324     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 325        declarator.  */
 326     tree id;
 327     /* For functions.  */
 328     struct c_arg_info *arg_info;
 329     /* For arrays.  */
 330     struct {
 331       /* The array dimension, or NULL for [] and [*].  */
 332       tree dimen;
 333       /* The qualifiers inside [].  */
 334       int quals;
 335       /* The attributes (currently ignored) inside [].  */
 336       tree attrs;
 337       /* Whether [static] was used.  */
 338       BOOL_BITFIELD static_p : 1;
 339       /* Whether [*] was used.  */
 340       BOOL_BITFIELD vla_unspec_p : 1;
 341     } array;
 342     /* For pointers, the qualifiers on the pointer type.  */
 343     int pointer_quals;
 344     /* For attributes.  */
 345     tree attrs;
 346   } u;
 347 };
 348
 349 /* A type name.  */
 350 struct c_type_name {
 351   /* The declaration specifiers.  */
 352   struct c_declspecs *specs;
 353   /* The declarator.  */
 354   struct c_declarator *declarator;
 355 };
 356
 357 /* A parameter.  */
 358 struct c_parm {
 359   /* The declaration specifiers, minus any prefix attributes.  */
 360   struct c_declspecs *specs;
 361   /* The attributes.  */
 362   tree attrs;
 363   /* The declarator.  */
 364   struct c_declarator *declarator;
 365 };
 366
 367 /* Used when parsing an enum.  Initialized by start_enum.  */
 368 struct c_enum_contents
 369 {
 370   /* While defining an enum type, this is 1 plus the last enumerator
 371      constant value.  */
 372   tree enum_next_value;
 373
 374   /* Nonzero means that there was overflow computing enum_next_value.  */
 375   int enum_overflow;
 376 };
 377
 378 /* A type of reference to a static identifier in an inline
 379    function.  */
 380 enum c_inline_static_type {
 381   /* Identifier with internal linkage used in function that may be an
 382      inline definition (i.e., file-scope static).  */
 383   csi_internal,
 384   /* Modifiable object with static storage duration defined in
 385      function that may be an inline definition (i.e., local
 386      static).  */
 387   csi_modifiable
 388 };
 389
 390 \f
 391 /* in c-parser.c */
 392 extern void c_parse_init (void);
 393
 394 /* in c-aux-info.c */
 395 extern void gen_aux_info_record (tree, int, int, int);
 396
 397 /* in c-decl.c */
 398 struct c_spot_bindings;
 399 struct c_struct_parse_info;
 400 extern struct obstack parser_obstack;
 401 extern tree c_break_label;
 402 extern tree c_cont_label;
 403
 404 extern int global_bindings_p (void);
 405 extern void push_scope (void);
 406 extern tree pop_scope (void);
 407 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 408 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 409
 410 extern void record_inline_static (location_t, tree, tree,
 411                                   enum c_inline_static_type);
 412 extern void c_init_decl_processing (void);
 413 extern void c_print_identifier (FILE *, tree, int);
 414 extern int quals_from_declspecs (const struct c_declspecs *);
 415 extern struct c_declarator *build_array_declarator (location_t, tree,
 416                                                     struct c_declspecs *,
 417                                                     bool, bool);
 418 extern tree build_enumerator (location_t, struct c_enum_contents *, tree, tree);
 419 extern tree check_for_loop_decls (location_t);
 420 extern void mark_forward_parm_decls (void);
 421 extern void declare_parm_level (void);
 422 extern void undeclared_variable (location_t, tree);
 423 extern tree lookup_label_for_goto (location_t, tree);
 424 extern tree declare_label (tree);
 425 extern tree define_label (location_t, tree);
 426 extern struct c_spot_bindings *c_get_switch_bindings (void);
 427 extern void c_release_switch_bindings (struct c_spot_bindings *);
 428 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 429                                           location_t, location_t);
 430 extern void c_maybe_initialize_eh (void);
 431 extern void finish_decl (tree, location_t, tree, tree, tree);
 432 extern tree finish_enum (tree, tree, tree);
 433 extern void finish_function (void);
 434 extern tree finish_struct (location_t, tree, tree, tree,
 435                            struct c_struct_parse_info *);
 436 extern struct c_arg_info *get_parm_info (bool);
 437 extern tree grokfield (location_t, struct c_declarator *,
 438                        struct c_declspecs *, tree, tree *);
 439 extern tree groktypename (struct c_type_name *, tree *, bool *);
 440 extern tree grokparm (const struct c_parm *);
 441 extern tree implicitly_declare (location_t, tree);
 442 extern void keep_next_level (void);
 443 extern void pending_xref_error (void);
 444 extern void c_push_function_context (void);
 445 extern void c_pop_function_context (void);
 446 extern void push_parm_decl (const struct c_parm *);
 447 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 448                                                         struct c_declarator *);
 449 extern tree c_builtin_function (tree);
 450 extern tree c_builtin_function_ext_scope (tree);
 451 extern void shadow_tag (const struct c_declspecs *);
 452 extern void shadow_tag_warned (const struct c_declspecs *, int);
 453 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 454 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 455 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 456                         tree);
 457 extern tree start_struct (location_t, enum tree_code, tree,
 458                           struct c_struct_parse_info **);
 459 extern void store_parm_decls (void);
 460 extern void store_parm_decls_from (struct c_arg_info *);
 461 extern tree xref_tag (enum tree_code, tree);
 462 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 463 extern int c_expand_decl (tree);
 464 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 465                                     struct c_declarator *);
 466 extern struct c_declarator *build_attrs_declarator (tree,
 467                                                     struct c_declarator *);
 468 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 469                                                        struct c_declarator *);
 470 extern struct c_declarator *build_id_declarator (tree);
 471 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 472                                                      struct c_declarator *);
 473 extern struct c_declspecs *build_null_declspecs (void);
 474 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 475 extern struct c_declspecs *declspecs_add_type (location_t,
 476                                                struct c_declspecs *,
 477                                                struct c_typespec);
 478 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 479 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 480 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 481
 482 /* in c-objc-common.c */
 483 extern bool c_objc_common_init (void);
 484 extern bool c_missing_noreturn_ok_p (tree);
 485 extern bool c_warn_unused_global_decl (const_tree);
 486 extern void c_initialize_diagnostics (diagnostic_context *);
 487 extern bool c_vla_unspec_p (tree x, tree fn);
 488
 489 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 490   c_build_qualified_type ((TYPE),                                 \
 491                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 492                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 493
 494 /* in c-typeck.c */
 495 extern bool in_late_binary_op;
 496 extern int in_alignof;
 497 extern int in_sizeof;
 498 extern int in_typeof;
 499
 500 extern struct c_switch *c_switch_stack;
 501
 502 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 503 extern tree require_complete_type (tree);
 504 extern int same_translation_unit_p (const_tree, const_tree);
 505 extern int comptypes (tree, tree);
 506 extern bool c_vla_type_p (const_tree);
 507 extern bool c_mark_addressable (tree);
 508 extern void c_incomplete_type_error (const_tree, const_tree);
 509 extern tree c_type_promotes_to (tree);
 510 extern struct c_expr default_function_array_conversion (location_t,
 511                                                         struct c_expr);
 512 extern tree composite_type (tree, tree);
 513 extern tree build_component_ref (location_t, tree, tree);
 514 extern tree build_array_ref (location_t, tree, tree);
 515 extern tree build_external_ref (location_t, tree, int, tree *);
 516 extern void pop_maybe_used (bool);
 517 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 518 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 519 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 520                                             struct c_expr);
 521 extern struct c_expr parser_build_binary_op (location_t,
 522                                              enum tree_code, struct c_expr,
 523                                              struct c_expr);
 524 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 525                                     tree, tree);
 526 extern tree build_compound_expr (location_t, tree, tree);
 527 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 528 extern tree build_c_cast (location_t, tree, tree);
 529 extern void store_init_value (location_t, tree, tree, tree);
 530 extern void error_init (const char *);
 531 extern void pedwarn_init (location_t, int opt, const char *);
 532 extern void maybe_warn_string_init (tree, struct c_expr);
 533 extern void start_init (tree, tree, int);
 534 extern void finish_init (void);
 535 extern void really_start_incremental_init (tree);
 536 extern void push_init_level (int);
 537 extern struct c_expr pop_init_level (int);
 538 extern void set_init_index (tree, tree);
 539 extern void set_init_label (tree);
 540 extern void process_init_element (struct c_expr, bool);
 541 extern tree build_compound_literal (location_t, tree, tree, bool);
 542 extern void check_compound_literal_type (location_t, struct c_type_name *);
 543 extern tree c_start_case (location_t, location_t, tree);
 544 extern void c_finish_case (tree);
 545 extern tree build_asm_expr (location_t, tree, tree, tree, tree, bool);
 546 extern tree build_asm_stmt (tree, tree);
 547 extern int c_types_compatible_p (tree, tree);
 548 extern tree c_begin_compound_stmt (bool);
 549 extern tree c_end_compound_stmt (location_t, tree, bool);
 550 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 551 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 552 extern tree c_begin_stmt_expr (void);
 553 extern tree c_finish_stmt_expr (location_t, tree);
 554 extern tree c_process_expr_stmt (location_t, tree);
 555 extern tree c_finish_expr_stmt (location_t, tree);
 556 extern tree c_finish_return (location_t, tree, tree);
 557 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 558 extern tree c_finish_goto_label (location_t, tree);
 559 extern tree c_finish_goto_ptr (location_t, tree);
 560 extern tree c_expr_to_decl (tree, bool *, bool *);
 561 extern tree c_begin_omp_parallel (void);
 562 extern tree c_finish_omp_parallel (location_t, tree, tree);
 563 extern tree c_begin_omp_task (void);
 564 extern tree c_finish_omp_task (location_t, tree, tree);
 565 extern tree c_finish_omp_clauses (tree);
 566 extern tree c_build_va_arg (location_t, tree, tree);
 567
 568 /* Set to 0 at beginning of a function definition, set to 1 if
 569    a return statement that specifies a return value is seen.  */
 570
 571 extern int current_function_returns_value;
 572
 573 /* Set to 0 at beginning of a function definition, set to 1 if
 574    a return statement with no argument is seen.  */
 575
 576 extern int current_function_returns_null;
 577
 578 /* Set to 0 at beginning of a function definition, set to 1 if
 579    a call to a noreturn function is seen.  */
 580
 581 extern int current_function_returns_abnormally;
 582
 583 /* Nonzero means we are reading code that came from a system header file.  */
 584
 585 extern int system_header_p;
 586
 587 /* True means global_bindings_p should return false even if the scope stack
 588    says we are in file scope.  */
 589
 590 extern bool c_override_global_bindings_to_false;
 591
 592 /* True means we've initialized exception handling.  */
 593 extern bool c_eh_initialized_p;
 594
 595 /* In c-decl.c */
 596 extern void c_finish_incomplete_decl (tree);
 597 extern void c_write_global_declarations (void);
 598
 599 /* In order for the format checking to accept the C frontend
 600    diagnostic framework extensions, you must include this file before
 601    toplev.h, not after.  */
 602 #if GCC_VERSION >= 4001
 603 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 604 #else
 605 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 606 #endif
 607
 608 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
 609 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
 610
 611 extern bool c_cpp_error (cpp_reader *, int, location_t, unsigned int,
 612                          const char *, va_list *)
 613      ATTRIBUTE_GCC_CDIAG(5,0);
 614
 615 #endif /* ! GCC_C_TREE_H */