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   /* The address space that the declaration belongs to.  */
 281   addr_space_t address_space;
 282 };
 283
 284 /* The various kinds of declarators in C.  */
 285 enum c_declarator_kind {
 286   /* An identifier.  */
 287   cdk_id,
 288   /* A function.  */
 289   cdk_function,
 290   /* An array.  */
 291   cdk_array,
 292   /* A pointer.  */
 293   cdk_pointer,
 294   /* Parenthesized declarator with nested attributes.  */
 295   cdk_attrs
 296 };
 297
 298 /* Information about the parameters in a function declarator.  */
 299 struct c_arg_info {
 300   /* A list of parameter decls.  */
 301   tree parms;
 302   /* A list of structure, union and enum tags defined.  */
 303   tree tags;
 304   /* A list of argument types to go in the FUNCTION_TYPE.  */
 305   tree types;
 306   /* A list of non-parameter decls (notably enumeration constants)
 307      defined with the parameters.  */
 308   tree others;
 309   /* A list of VLA sizes from the parameters.  In a function
 310      definition, these are used to ensure that side-effects in sizes
 311      of arrays converted to pointers (such as a parameter int i[n++])
 312      take place; otherwise, they are ignored.  */
 313   tree pending_sizes;
 314   /* True when these arguments had [*].  */
 315   BOOL_BITFIELD had_vla_unspec : 1;
 316 };
 317
 318 /* A declarator.  */
 319 struct c_declarator {
 320   /* The kind of declarator.  */
 321   enum c_declarator_kind kind;
 322   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 323   struct c_declarator *declarator;
 324   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 325   union {
 326     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 327        declarator.  */
 328     tree id;
 329     /* For functions.  */
 330     struct c_arg_info *arg_info;
 331     /* For arrays.  */
 332     struct {
 333       /* The array dimension, or NULL for [] and [*].  */
 334       tree dimen;
 335       /* The qualifiers inside [].  */
 336       int quals;
 337       /* The attributes (currently ignored) inside [].  */
 338       tree attrs;
 339       /* Whether [static] was used.  */
 340       BOOL_BITFIELD static_p : 1;
 341       /* Whether [*] was used.  */
 342       BOOL_BITFIELD vla_unspec_p : 1;
 343     } array;
 344     /* For pointers, the qualifiers on the pointer type.  */
 345     int pointer_quals;
 346     /* For attributes.  */
 347     tree attrs;
 348   } u;
 349 };
 350
 351 /* A type name.  */
 352 struct c_type_name {
 353   /* The declaration specifiers.  */
 354   struct c_declspecs *specs;
 355   /* The declarator.  */
 356   struct c_declarator *declarator;
 357 };
 358
 359 /* A parameter.  */
 360 struct c_parm {
 361   /* The declaration specifiers, minus any prefix attributes.  */
 362   struct c_declspecs *specs;
 363   /* The attributes.  */
 364   tree attrs;
 365   /* The declarator.  */
 366   struct c_declarator *declarator;
 367 };
 368
 369 /* Used when parsing an enum.  Initialized by start_enum.  */
 370 struct c_enum_contents
 371 {
 372   /* While defining an enum type, this is 1 plus the last enumerator
 373      constant value.  */
 374   tree enum_next_value;
 375
 376   /* Nonzero means that there was overflow computing enum_next_value.  */
 377   int enum_overflow;
 378 };
 379
 380 /* A type of reference to a static identifier in an inline
 381    function.  */
 382 enum c_inline_static_type {
 383   /* Identifier with internal linkage used in function that may be an
 384      inline definition (i.e., file-scope static).  */
 385   csi_internal,
 386   /* Modifiable object with static storage duration defined in
 387      function that may be an inline definition (i.e., local
 388      static).  */
 389   csi_modifiable
 390 };
 391
 392 \f
 393 /* in c-parser.c */
 394 extern void c_parse_init (void);
 395
 396 /* in c-aux-info.c */
 397 extern void gen_aux_info_record (tree, int, int, int);
 398
 399 /* in c-decl.c */
 400 struct c_spot_bindings;
 401 struct c_struct_parse_info;
 402 extern struct obstack parser_obstack;
 403 extern tree c_break_label;
 404 extern tree c_cont_label;
 405
 406 extern int global_bindings_p (void);
 407 extern void push_scope (void);
 408 extern tree pop_scope (void);
 409 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 410 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 411
 412 extern void record_inline_static (location_t, tree, tree,
 413                                   enum c_inline_static_type);
 414 extern void c_init_decl_processing (void);
 415 extern void c_print_identifier (FILE *, tree, int);
 416 extern int quals_from_declspecs (const struct c_declspecs *);
 417 extern struct c_declarator *build_array_declarator (location_t, tree,
 418                                                     struct c_declspecs *,
 419                                                     bool, bool);
 420 extern tree build_enumerator (location_t, struct c_enum_contents *, tree, tree);
 421 extern tree check_for_loop_decls (location_t);
 422 extern void mark_forward_parm_decls (void);
 423 extern void declare_parm_level (void);
 424 extern void undeclared_variable (location_t, tree);
 425 extern tree lookup_label_for_goto (location_t, tree);
 426 extern tree declare_label (tree);
 427 extern tree define_label (location_t, tree);
 428 extern struct c_spot_bindings *c_get_switch_bindings (void);
 429 extern void c_release_switch_bindings (struct c_spot_bindings *);
 430 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 431                                           location_t, location_t);
 432 extern void finish_decl (tree, location_t, tree, tree, tree);
 433 extern tree finish_enum (tree, tree, tree);
 434 extern void finish_function (void);
 435 extern tree finish_struct (location_t, tree, tree, tree,
 436                            struct c_struct_parse_info *);
 437 extern struct c_arg_info *get_parm_info (bool);
 438 extern tree grokfield (location_t, struct c_declarator *,
 439                        struct c_declspecs *, tree, tree *);
 440 extern tree groktypename (struct c_type_name *, tree *, bool *);
 441 extern tree grokparm (const struct c_parm *);
 442 extern tree implicitly_declare (location_t, tree);
 443 extern void keep_next_level (void);
 444 extern void pending_xref_error (void);
 445 extern void c_push_function_context (void);
 446 extern void c_pop_function_context (void);
 447 extern void push_parm_decl (const struct c_parm *);
 448 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 449                                                         struct c_declarator *);
 450 extern tree c_builtin_function (tree);
 451 extern tree c_builtin_function_ext_scope (tree);
 452 extern void shadow_tag (const struct c_declspecs *);
 453 extern void shadow_tag_warned (const struct c_declspecs *, int);
 454 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 455 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 456 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 457                         tree);
 458 extern tree start_struct (location_t, enum tree_code, tree,
 459                           struct c_struct_parse_info **);
 460 extern void store_parm_decls (void);
 461 extern void store_parm_decls_from (struct c_arg_info *);
 462 extern tree xref_tag (enum tree_code, tree);
 463 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 464 extern int c_expand_decl (tree);
 465 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 466                                     struct c_declarator *);
 467 extern struct c_declarator *build_attrs_declarator (tree,
 468                                                     struct c_declarator *);
 469 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 470                                                        struct c_declarator *);
 471 extern struct c_declarator *build_id_declarator (tree);
 472 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 473                                                      struct c_declarator *);
 474 extern struct c_declspecs *build_null_declspecs (void);
 475 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 476 extern struct c_declspecs *declspecs_add_type (location_t,
 477                                                struct c_declspecs *,
 478                                                struct c_typespec);
 479 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 480 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 481 extern struct c_declspecs *declspecs_add_addrspace (struct c_declspecs *,
 482                                                     addr_space_t);
 483 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 484
 485 /* in c-objc-common.c */
 486 extern bool c_objc_common_init (void);
 487 extern bool c_missing_noreturn_ok_p (tree);
 488 extern bool c_warn_unused_global_decl (const_tree);
 489 extern void c_initialize_diagnostics (diagnostic_context *);
 490 extern bool c_vla_unspec_p (tree x, tree fn);
 491
 492 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 493   c_build_qualified_type ((TYPE),                                 \
 494                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 495                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 496
 497 /* in c-typeck.c */
 498 extern bool in_late_binary_op;
 499 extern int in_alignof;
 500 extern int in_sizeof;
 501 extern int in_typeof;
 502
 503 extern struct c_switch *c_switch_stack;
 504
 505 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 506 extern tree require_complete_type (tree);
 507 extern int same_translation_unit_p (const_tree, const_tree);
 508 extern int comptypes (tree, tree);
 509 extern bool c_vla_type_p (const_tree);
 510 extern bool c_mark_addressable (tree);
 511 extern void c_incomplete_type_error (const_tree, const_tree);
 512 extern tree c_type_promotes_to (tree);
 513 extern struct c_expr default_function_array_conversion (location_t,
 514                                                         struct c_expr);
 515 extern tree composite_type (tree, tree);
 516 extern tree build_component_ref (location_t, tree, tree);
 517 extern tree build_array_ref (location_t, tree, tree);
 518 extern tree build_external_ref (location_t, tree, int, tree *);
 519 extern void pop_maybe_used (bool);
 520 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 521 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 522 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 523                                             struct c_expr);
 524 extern struct c_expr parser_build_binary_op (location_t,
 525                                              enum tree_code, struct c_expr,
 526                                              struct c_expr);
 527 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 528                                     tree, tree);
 529 extern tree build_compound_expr (location_t, tree, tree);
 530 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 531 extern tree build_c_cast (location_t, tree, tree);
 532 extern void store_init_value (location_t, tree, tree, tree);
 533 extern void error_init (const char *);
 534 extern void pedwarn_init (location_t, int opt, const char *);
 535 extern void maybe_warn_string_init (tree, struct c_expr);
 536 extern void start_init (tree, tree, int);
 537 extern void finish_init (void);
 538 extern void really_start_incremental_init (tree);
 539 extern void push_init_level (int);
 540 extern struct c_expr pop_init_level (int);
 541 extern void set_init_index (tree, tree);
 542 extern void set_init_label (tree);
 543 extern void process_init_element (struct c_expr, bool);
 544 extern tree build_compound_literal (location_t, tree, tree, bool);
 545 extern void check_compound_literal_type (location_t, struct c_type_name *);
 546 extern tree c_start_case (location_t, location_t, tree);
 547 extern void c_finish_case (tree);
 548 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 549 extern tree build_asm_stmt (tree, tree);
 550 extern int c_types_compatible_p (tree, tree);
 551 extern tree c_begin_compound_stmt (bool);
 552 extern tree c_end_compound_stmt (location_t, tree, bool);
 553 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 554 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 555 extern tree c_begin_stmt_expr (void);
 556 extern tree c_finish_stmt_expr (location_t, tree);
 557 extern tree c_process_expr_stmt (location_t, tree);
 558 extern tree c_finish_expr_stmt (location_t, tree);
 559 extern tree c_finish_return (location_t, tree, tree);
 560 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 561 extern tree c_finish_goto_label (location_t, tree);
 562 extern tree c_finish_goto_ptr (location_t, tree);
 563 extern tree c_expr_to_decl (tree, bool *, bool *);
 564 extern tree c_begin_omp_parallel (void);
 565 extern tree c_finish_omp_parallel (location_t, tree, tree);
 566 extern tree c_begin_omp_task (void);
 567 extern tree c_finish_omp_task (location_t, tree, tree);
 568 extern tree c_finish_omp_clauses (tree);
 569 extern tree c_build_va_arg (location_t, tree, tree);
 570
 571 /* Set to 0 at beginning of a function definition, set to 1 if
 572    a return statement that specifies a return value is seen.  */
 573
 574 extern int current_function_returns_value;
 575
 576 /* Set to 0 at beginning of a function definition, set to 1 if
 577    a return statement with no argument is seen.  */
 578
 579 extern int current_function_returns_null;
 580
 581 /* Set to 0 at beginning of a function definition, set to 1 if
 582    a call to a noreturn function is seen.  */
 583
 584 extern int current_function_returns_abnormally;
 585
 586 /* Nonzero means we are reading code that came from a system header file.  */
 587
 588 extern int system_header_p;
 589
 590 /* True means global_bindings_p should return false even if the scope stack
 591    says we are in file scope.  */
 592
 593 extern bool c_override_global_bindings_to_false;
 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 */