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 /* Language-specific declaration information.  */
  35
  36 struct GTY(()) lang_decl {
  37   char dummy;
  38 };
  39
  40 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  41 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  42
  43 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  44 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  45
  46 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  47    nonzero if the definition of the type has already started.  */
  48 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  49
  50 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  51    declarations whose type would be completed by completing that type.  */
  52 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  53
  54 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  55    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  56    and C_RID_YYCODE is the token number wanted by Yacc.  */
  57 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  58
  59 struct GTY(()) lang_type {
  60   /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  61   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
  62   /* In an ENUMERAL_TYPE, the min and max values.  */
  63   tree enum_min;
  64   tree enum_max;
  65   /* In a RECORD_TYPE, information specific to Objective-C, such
  66      as a list of adopted protocols or a pointer to a corresponding
  67      @interface.  See objc/objc-act.h for details.  */
  68   tree objc_info;
  69 };
  70
  71 /* Record whether a type or decl was written with nonconstant size.
  72    Note that TYPE_SIZE may have simplified to a constant.  */
  73 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  74 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  75
  76 /* Record whether a type is defined inside a struct or union type.
  77    This is used for -Wc++-compat. */
  78 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  79
  80 /* Record whether a typedef for type `int' was actually `signed int'.  */
  81 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  82
  83 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  84    return type.  */
  85 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  86
  87 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  88 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  89
  90 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  91    been declared.  */
  92 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  93   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  94
  95 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  96    built-in prototype and does not have a non-built-in prototype.  */
  97 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  98   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  99
 100 /* Record whether a decl was declared register.  This is strictly a
 101    front-end flag, whereas DECL_REGISTER is used for code generation;
 102    they may differ for structures with volatile fields.  */
 103 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
 104
 105 /* Record whether a decl was used in an expression anywhere except an
 106    unevaluated operand of sizeof / typeof / alignof.  This is only
 107    used for functions declared static but not defined, though outside
 108    sizeof and typeof it is set for other function decls as well.  */
 109 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
 110
 111 /* Record whether a variable has been declared threadprivate by
 112    #pragma omp threadprivate.  */
 113 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
 114
 115 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 116    N.B. Could be simplified if all built-in decls had complete prototypes
 117    (but this is presently difficult because some of them need FILE*).  */
 118 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 119        (EXP == 0                                        \
 120         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 121             && !DECL_BUILT_IN (EXP)))
 122
 123 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 124    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 125    without prototypes.  */
 126 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 127
 128 /* For a CONSTRUCTOR, whether some initializer contains a
 129    subexpression meaning it is not a constant expression.  */
 130 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 131
 132 /* Record parser information about an expression that is irrelevant
 133    for code generation alongside a tree representing its value.  */
 134 struct c_expr
 135 {
 136   /* The value of the expression.  */
 137   tree value;
 138   /* Record the original unary/binary operator of an expression, which may
 139      have been changed by fold, STRING_CST for unparenthesized string
 140      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 141      (even if parenthesized), for subexpressions, and for non-constant
 142      initializers, or ERROR_MARK for other expressions (including
 143      parenthesized expressions).  */
 144   enum tree_code original_code;
 145   /* If not NULL, the original type of an expression.  This will
 146      differ from the type of the value field for an enum constant.
 147      The type of an enum constant is a plain integer type, but this
 148      field will be the enum type.  */
 149   tree original_type;
 150 };
 151
 152 /* A kind of type specifier.  Note that this information is currently
 153    only used to distinguish tag definitions, tag references and typeof
 154    uses.  */
 155 enum c_typespec_kind {
 156   /* A reserved keyword type specifier.  */
 157   ctsk_resword,
 158   /* A reference to a tag, previously declared, such as "struct foo".
 159      This includes where the previous declaration was as a different
 160      kind of tag, in which case this is only valid if shadowing that
 161      tag in an inner scope.  */
 162   ctsk_tagref,
 163   /* A reference to a tag, not previously declared in a visible
 164      scope.  */
 165   ctsk_tagfirstref,
 166   /* A definition of a tag such as "struct foo { int a; }".  */
 167   ctsk_tagdef,
 168   /* A typedef name.  */
 169   ctsk_typedef,
 170   /* An ObjC-specific kind of type specifier.  */
 171   ctsk_objc,
 172   /* A typeof specifier.  */
 173   ctsk_typeof
 174 };
 175
 176 /* A type specifier: this structure is created in the parser and
 177    passed to declspecs_add_type only.  */
 178 struct c_typespec {
 179   /* What kind of type specifier this is.  */
 180   enum c_typespec_kind kind;
 181   /* The specifier itself.  */
 182   tree spec;
 183   /* An expression to be evaluated before the type specifier, in the
 184      case of typeof specifiers, or NULL otherwise or if no such
 185      expression is required for a particular typeof specifier.  In
 186      particular, when typeof is applied to an expression of variably
 187      modified type, that expression must be evaluated in order to
 188      determine array sizes that form part of the type, but the
 189      expression itself (as opposed to the array sizes) forms no part
 190      of the type and so needs to be recorded separately.  */
 191   tree expr;
 192   /* Whether the expression has operands suitable for use in constant
 193      expressions.  */
 194   bool expr_const_operands;
 195 };
 196
 197 /* A storage class specifier.  */
 198 enum c_storage_class {
 199   csc_none,
 200   csc_auto,
 201   csc_extern,
 202   csc_register,
 203   csc_static,
 204   csc_typedef
 205 };
 206
 207 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 208    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 209    or none of these.  */
 210 enum c_typespec_keyword {
 211   cts_none,
 212   cts_void,
 213   cts_bool,
 214   cts_char,
 215   cts_int,
 216   cts_float,
 217   cts_double,
 218   cts_dfloat32,
 219   cts_dfloat64,
 220   cts_dfloat128,
 221   cts_fract,
 222   cts_accum
 223 };
 224
 225 /* A sequence of declaration specifiers in C.  */
 226 struct c_declspecs {
 227   /* The type specified, if a single type specifier such as a struct,
 228      union or enum specifier, typedef name or typeof specifies the
 229      whole type, or NULL_TREE if none or a keyword such as "void" or
 230      "char" is used.  Does not include qualifiers.  */
 231   tree type;
 232   /* Any expression to be evaluated before the type, from a typeof
 233      specifier.  */
 234   tree expr;
 235   /* The attributes from a typedef decl.  */
 236   tree decl_attr;
 237   /* When parsing, the attributes.  Outside the parser, this will be
 238      NULL; attributes (possibly from multiple lists) will be passed
 239      separately.  */
 240   tree attrs;
 241   /* Any type specifier keyword used such as "int", not reflecting
 242      modifiers such as "short", or cts_none if none.  */
 243   enum c_typespec_keyword typespec_word;
 244   /* The storage class specifier, or csc_none if none.  */
 245   enum c_storage_class storage_class;
 246   /* Whether any expressions in typeof specifiers may appear in
 247      constant expressions.  */
 248   BOOL_BITFIELD expr_const_operands : 1;
 249   /* Whether any declaration specifiers have been seen at all.  */
 250   BOOL_BITFIELD declspecs_seen_p : 1;
 251   /* Whether a type specifier has been seen.  */
 252   BOOL_BITFIELD type_seen_p : 1;
 253   /* Whether something other than a storage class specifier or
 254      attribute has been seen.  This is used to warn for the
 255      obsolescent usage of storage class specifiers other than at the
 256      start of the list.  (Doing this properly would require function
 257      specifiers to be handled separately from storage class
 258      specifiers.)  */
 259   BOOL_BITFIELD non_sc_seen_p : 1;
 260   /* Whether the type is specified by a typedef or typeof name.  */
 261   BOOL_BITFIELD typedef_p : 1;
 262   /* Whether a struct, union or enum type either had its content
 263      defined by a type specifier in the list or was the first visible
 264      declaration of its tag.  */
 265   BOOL_BITFIELD tag_defined_p : 1;
 266   /* Whether the type is explicitly "signed" or specified by a typedef
 267      whose type is explicitly "signed".  */
 268   BOOL_BITFIELD explicit_signed_p : 1;
 269   /* Whether the specifiers include a deprecated typedef.  */
 270   BOOL_BITFIELD deprecated_p : 1;
 271   /* Whether the type defaulted to "int" because there were no type
 272      specifiers.  */
 273   BOOL_BITFIELD default_int_p;
 274   /* Whether "long" was specified.  */
 275   BOOL_BITFIELD long_p : 1;
 276   /* Whether "long" was specified more than once.  */
 277   BOOL_BITFIELD long_long_p : 1;
 278   /* Whether "short" was specified.  */
 279   BOOL_BITFIELD short_p : 1;
 280   /* Whether "signed" was specified.  */
 281   BOOL_BITFIELD signed_p : 1;
 282   /* Whether "unsigned" was specified.  */
 283   BOOL_BITFIELD unsigned_p : 1;
 284   /* Whether "complex" was specified.  */
 285   BOOL_BITFIELD complex_p : 1;
 286   /* Whether "inline" was specified.  */
 287   BOOL_BITFIELD inline_p : 1;
 288   /* Whether "__thread" was specified.  */
 289   BOOL_BITFIELD thread_p : 1;
 290   /* Whether "const" was specified.  */
 291   BOOL_BITFIELD const_p : 1;
 292   /* Whether "volatile" was specified.  */
 293   BOOL_BITFIELD volatile_p : 1;
 294   /* Whether "restrict" was specified.  */
 295   BOOL_BITFIELD restrict_p : 1;
 296   /* Whether "_Sat" was specified.  */
 297   BOOL_BITFIELD saturating_p : 1;
 298 };
 299
 300 /* The various kinds of declarators in C.  */
 301 enum c_declarator_kind {
 302   /* An identifier.  */
 303   cdk_id,
 304   /* A function.  */
 305   cdk_function,
 306   /* An array.  */
 307   cdk_array,
 308   /* A pointer.  */
 309   cdk_pointer,
 310   /* Parenthesized declarator with nested attributes.  */
 311   cdk_attrs
 312 };
 313
 314 /* Information about the parameters in a function declarator.  */
 315 struct c_arg_info {
 316   /* A list of parameter decls.  */
 317   tree parms;
 318   /* A list of structure, union and enum tags defined.  */
 319   tree tags;
 320   /* A list of argument types to go in the FUNCTION_TYPE.  */
 321   tree types;
 322   /* A list of non-parameter decls (notably enumeration constants)
 323      defined with the parameters.  */
 324   tree others;
 325   /* A list of VLA sizes from the parameters.  In a function
 326      definition, these are used to ensure that side-effects in sizes
 327      of arrays converted to pointers (such as a parameter int i[n++])
 328      take place; otherwise, they are ignored.  */
 329   tree pending_sizes;
 330   /* True when these arguments had [*].  */
 331   BOOL_BITFIELD had_vla_unspec : 1;
 332 };
 333
 334 /* A declarator.  */
 335 struct c_declarator {
 336   /* The kind of declarator.  */
 337   enum c_declarator_kind kind;
 338   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 339   struct c_declarator *declarator;
 340   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 341   union {
 342     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 343        declarator.  */
 344     tree id;
 345     /* For functions.  */
 346     struct c_arg_info *arg_info;
 347     /* For arrays.  */
 348     struct {
 349       /* The array dimension, or NULL for [] and [*].  */
 350       tree dimen;
 351       /* The qualifiers inside [].  */
 352       int quals;
 353       /* The attributes (currently ignored) inside [].  */
 354       tree attrs;
 355       /* Whether [static] was used.  */
 356       BOOL_BITFIELD static_p : 1;
 357       /* Whether [*] was used.  */
 358       BOOL_BITFIELD vla_unspec_p : 1;
 359     } array;
 360     /* For pointers, the qualifiers on the pointer type.  */
 361     int pointer_quals;
 362     /* For attributes.  */
 363     tree attrs;
 364   } u;
 365 };
 366
 367 /* A type name.  */
 368 struct c_type_name {
 369   /* The declaration specifiers.  */
 370   struct c_declspecs *specs;
 371   /* The declarator.  */
 372   struct c_declarator *declarator;
 373 };
 374
 375 /* A parameter.  */
 376 struct c_parm {
 377   /* The declaration specifiers, minus any prefix attributes.  */
 378   struct c_declspecs *specs;
 379   /* The attributes.  */
 380   tree attrs;
 381   /* The declarator.  */
 382   struct c_declarator *declarator;
 383 };
 384
 385 /* Save and restore the variables in this file and elsewhere
 386    that keep track of the progress of compilation of the current function.
 387    Used for nested functions.  */
 388
 389 struct GTY(()) language_function {
 390   struct c_language_function base;
 391   tree x_break_label;
 392   tree x_cont_label;
 393   struct c_switch * GTY((skip)) x_switch_stack;
 394   struct c_arg_info * GTY((skip)) arg_info;
 395   int returns_value;
 396   int returns_null;
 397   int returns_abnormally;
 398   int warn_about_return_type;
 399 };
 400
 401 /* Used when parsing an enum.  Initialized by start_enum.  */
 402 struct c_enum_contents
 403 {
 404   /* While defining an enum type, this is 1 plus the last enumerator
 405      constant value.  */
 406   tree enum_next_value;
 407
 408   /* Nonzero means that there was overflow computing enum_next_value.  */
 409   int enum_overflow;
 410 };
 411
 412 /* A type of reference to a static identifier in an inline
 413    function.  */
 414 enum c_inline_static_type {
 415   /* Identifier with internal linkage used in function that may be an
 416      inline definition (i.e., file-scope static).  */
 417   csi_internal,
 418   /* Modifiable object with static storage duration defined in
 419      function that may be an inline definition (i.e., local
 420      static).  */
 421   csi_modifiable
 422 };
 423
 424 \f
 425 /* in c-parser.c */
 426 extern void c_parse_init (void);
 427
 428 /* in c-aux-info.c */
 429 extern void gen_aux_info_record (tree, int, int, int);
 430
 431 /* in c-decl.c */
 432 struct c_spot_bindings;
 433 struct c_struct_parse_info;
 434 extern struct obstack parser_obstack;
 435 extern tree c_break_label;
 436 extern tree c_cont_label;
 437
 438 extern int global_bindings_p (void);
 439 extern void push_scope (void);
 440 extern tree pop_scope (void);
 441 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 442 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 443
 444 extern void record_inline_static (location_t, tree, tree,
 445                                   enum c_inline_static_type);
 446 extern void c_init_decl_processing (void);
 447 extern void c_dup_lang_specific_decl (tree);
 448 extern void c_print_identifier (FILE *, tree, int);
 449 extern int quals_from_declspecs (const struct c_declspecs *);
 450 extern struct c_declarator *build_array_declarator (location_t, tree,
 451                                                     struct c_declspecs *,
 452                                                     bool, bool);
 453 extern tree build_enumerator (location_t, struct c_enum_contents *, tree, tree);
 454 extern tree check_for_loop_decls (location_t);
 455 extern void mark_forward_parm_decls (void);
 456 extern void declare_parm_level (void);
 457 extern void undeclared_variable (location_t, tree);
 458 extern tree lookup_label_for_goto (location_t, tree);
 459 extern tree declare_label (tree);
 460 extern tree define_label (location_t, tree);
 461 extern struct c_spot_bindings *c_get_switch_bindings (void);
 462 extern void c_release_switch_bindings (struct c_spot_bindings *);
 463 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 464                                           location_t, location_t);
 465 extern void c_maybe_initialize_eh (void);
 466 extern void finish_decl (tree, location_t, tree, tree, tree);
 467 extern tree finish_enum (tree, tree, tree);
 468 extern void finish_function (void);
 469 extern tree finish_struct (location_t, tree, tree, tree,
 470                            struct c_struct_parse_info *);
 471 extern struct c_arg_info *get_parm_info (bool);
 472 extern tree grokfield (location_t, struct c_declarator *,
 473                        struct c_declspecs *, tree, tree *);
 474 extern tree groktypename (struct c_type_name *, tree *, bool *);
 475 extern tree grokparm (const struct c_parm *);
 476 extern tree implicitly_declare (location_t, tree);
 477 extern void keep_next_level (void);
 478 extern void pending_xref_error (void);
 479 extern void c_push_function_context (void);
 480 extern void c_pop_function_context (void);
 481 extern void push_parm_decl (const struct c_parm *);
 482 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 483                                                         struct c_declarator *);
 484 extern tree c_builtin_function (tree);
 485 extern tree c_builtin_function_ext_scope (tree);
 486 extern void shadow_tag (const struct c_declspecs *);
 487 extern void shadow_tag_warned (const struct c_declspecs *, int);
 488 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 489 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 490 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 491                         tree);
 492 extern tree start_struct (location_t, enum tree_code, tree,
 493                           struct c_struct_parse_info **);
 494 extern void store_parm_decls (void);
 495 extern void store_parm_decls_from (struct c_arg_info *);
 496 extern tree xref_tag (enum tree_code, tree);
 497 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 498 extern int c_expand_decl (tree);
 499 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 500                                     struct c_declarator *);
 501 extern struct c_declarator *build_attrs_declarator (tree,
 502                                                     struct c_declarator *);
 503 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 504                                                        struct c_declarator *);
 505 extern struct c_declarator *build_id_declarator (tree);
 506 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 507                                                      struct c_declarator *);
 508 extern struct c_declspecs *build_null_declspecs (void);
 509 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 510 extern struct c_declspecs *declspecs_add_type (location_t,
 511                                                struct c_declspecs *,
 512                                                struct c_typespec);
 513 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 514 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 515 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 516
 517 /* in c-objc-common.c */
 518 extern bool c_objc_common_init (void);
 519 extern bool c_missing_noreturn_ok_p (tree);
 520 extern bool c_warn_unused_global_decl (const_tree);
 521 extern void c_initialize_diagnostics (diagnostic_context *);
 522 extern bool c_vla_unspec_p (tree x, tree fn);
 523
 524 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 525   c_build_qualified_type ((TYPE),                                 \
 526                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 527                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 528
 529 /* in c-typeck.c */
 530 extern bool in_late_binary_op;
 531 extern int in_alignof;
 532 extern int in_sizeof;
 533 extern int in_typeof;
 534
 535 extern struct c_switch *c_switch_stack;
 536
 537 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 538 extern tree require_complete_type (tree);
 539 extern int same_translation_unit_p (const_tree, const_tree);
 540 extern int comptypes (tree, tree);
 541 extern bool c_vla_type_p (const_tree);
 542 extern bool c_mark_addressable (tree);
 543 extern void c_incomplete_type_error (const_tree, const_tree);
 544 extern tree c_type_promotes_to (tree);
 545 extern struct c_expr default_function_array_conversion (location_t,
 546                                                         struct c_expr);
 547 extern tree composite_type (tree, tree);
 548 extern tree build_component_ref (location_t, tree, tree);
 549 extern tree build_array_ref (location_t, tree, tree);
 550 extern tree build_external_ref (location_t, tree, int, tree *);
 551 extern void pop_maybe_used (bool);
 552 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 553 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 554 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 555                                             struct c_expr);
 556 extern struct c_expr parser_build_binary_op (location_t,
 557                                              enum tree_code, struct c_expr,
 558                                              struct c_expr);
 559 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 560                                     tree, tree);
 561 extern tree build_compound_expr (location_t, tree, tree);
 562 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 563 extern tree build_c_cast (location_t, tree, tree);
 564 extern void store_init_value (location_t, tree, tree, tree);
 565 extern void error_init (const char *);
 566 extern void pedwarn_init (location_t, int opt, const char *);
 567 extern void maybe_warn_string_init (tree, struct c_expr);
 568 extern void start_init (tree, tree, int);
 569 extern void finish_init (void);
 570 extern void really_start_incremental_init (tree);
 571 extern void push_init_level (int);
 572 extern struct c_expr pop_init_level (int);
 573 extern void set_init_index (tree, tree);
 574 extern void set_init_label (tree);
 575 extern void process_init_element (struct c_expr, bool);
 576 extern tree build_compound_literal (location_t, tree, tree, bool);
 577 extern void check_compound_literal_type (location_t, struct c_type_name *);
 578 extern tree c_start_case (location_t, location_t, tree);
 579 extern void c_finish_case (tree);
 580 extern tree build_asm_expr (location_t, tree, tree, tree, tree, bool);
 581 extern tree build_asm_stmt (tree, tree);
 582 extern int c_types_compatible_p (tree, tree);
 583 extern tree c_begin_compound_stmt (bool);
 584 extern tree c_end_compound_stmt (location_t, tree, bool);
 585 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 586 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 587 extern tree c_begin_stmt_expr (void);
 588 extern tree c_finish_stmt_expr (location_t, tree);
 589 extern tree c_process_expr_stmt (location_t, tree);
 590 extern tree c_finish_expr_stmt (location_t, tree);
 591 extern tree c_finish_return (location_t, tree, tree);
 592 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 593 extern tree c_finish_goto_label (location_t, tree);
 594 extern tree c_finish_goto_ptr (location_t, tree);
 595 extern tree c_expr_to_decl (tree, bool *, bool *);
 596 extern tree c_begin_omp_parallel (void);
 597 extern tree c_finish_omp_parallel (location_t, tree, tree);
 598 extern tree c_begin_omp_task (void);
 599 extern tree c_finish_omp_task (location_t, tree, tree);
 600 extern tree c_finish_omp_clauses (tree);
 601 extern tree c_build_va_arg (location_t, tree, tree);
 602
 603 /* Set to 0 at beginning of a function definition, set to 1 if
 604    a return statement that specifies a return value is seen.  */
 605
 606 extern int current_function_returns_value;
 607
 608 /* Set to 0 at beginning of a function definition, set to 1 if
 609    a return statement with no argument is seen.  */
 610
 611 extern int current_function_returns_null;
 612
 613 /* Set to 0 at beginning of a function definition, set to 1 if
 614    a call to a noreturn function is seen.  */
 615
 616 extern int current_function_returns_abnormally;
 617
 618 /* Nonzero means we are reading code that came from a system header file.  */
 619
 620 extern int system_header_p;
 621
 622 /* True means global_bindings_p should return false even if the scope stack
 623    says we are in file scope.  */
 624
 625 extern bool c_override_global_bindings_to_false;
 626
 627 /* True means we've initialized exception handling.  */
 628 extern bool c_eh_initialized_p;
 629
 630 /* In c-decl.c */
 631 extern void c_finish_incomplete_decl (tree);
 632 extern void c_write_global_declarations (void);
 633
 634 /* In order for the format checking to accept the C frontend
 635    diagnostic framework extensions, you must include this file before
 636    toplev.h, not after.  */
 637 #if GCC_VERSION >= 4001
 638 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 639 #else
 640 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 641 #endif
 642
 643 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
 644 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
 645
 646 extern bool c_cpp_error (cpp_reader *, int, location_t, unsigned int,
 647                          const char *, va_list *)
 648      ATTRIBUTE_GCC_CDIAG(5,0);
 649
 650 #endif /* ! GCC_C_TREE_H */