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, 2010
   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-family/c-common.h"
  26 #include "diagnostic.h"
  27
  28 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  29    know how big it is.  This is sanity-checked in c-decl.c.  */
  30 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  31   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  32
  33 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  34 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  35
  36 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  37 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  38
  39 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  40    nonzero if the definition of the type has already started.  */
  41 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  42
  43 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  44    declarations whose type would be completed by completing that type.  */
  45 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  46
  47 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  48    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  49    and C_RID_YYCODE is the token number wanted by Yacc.  */
  50 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  51
  52 /* Record whether a type or decl was written with nonconstant size.
  53    Note that TYPE_SIZE may have simplified to a constant.  */
  54 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  55 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  56
  57 /* Record whether a type is defined inside a struct or union type.
  58    This is used for -Wc++-compat. */
  59 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  60
  61 /* Record whether a typedef for type `int' was actually `signed int'.  */
  62 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  63
  64 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  65    return type.  */
  66 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  67
  68 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  69 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  70
  71 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  72    been declared.  */
  73 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  74   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  75
  76 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  77    built-in prototype and does not have a non-built-in prototype.  */
  78 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  79   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  80
  81 /* Record whether a decl was declared register.  This is strictly a
  82    front-end flag, whereas DECL_REGISTER is used for code generation;
  83    they may differ for structures with volatile fields.  */
  84 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  85
  86 /* Record whether a decl was used in an expression anywhere except an
  87    unevaluated operand of sizeof / typeof / alignof.  This is only
  88    used for functions declared static but not defined, though outside
  89    sizeof and typeof it is set for other function decls as well.  */
  90 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  91
  92 /* Record whether a variable has been declared threadprivate by
  93    #pragma omp threadprivate.  */
  94 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  95
  96 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
  97    N.B. Could be simplified if all built-in decls had complete prototypes
  98    (but this is presently difficult because some of them need FILE*).  */
  99 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 100        (EXP == 0                                        \
 101         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 102             && !DECL_BUILT_IN (EXP)))
 103
 104 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 105    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 106    without prototypes.  */
 107 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 108
 109 /* For a CONSTRUCTOR, whether some initializer contains a
 110    subexpression meaning it is not a constant expression.  */
 111 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 112
 113 /* Record parser information about an expression that is irrelevant
 114    for code generation alongside a tree representing its value.  */
 115 struct c_expr
 116 {
 117   /* The value of the expression.  */
 118   tree value;
 119   /* Record the original unary/binary operator of an expression, which may
 120      have been changed by fold, STRING_CST for unparenthesized string
 121      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 122      (even if parenthesized), for subexpressions, and for non-constant
 123      initializers, or ERROR_MARK for other expressions (including
 124      parenthesized expressions).  */
 125   enum tree_code original_code;
 126   /* If not NULL, the original type of an expression.  This will
 127      differ from the type of the value field for an enum constant.
 128      The type of an enum constant is a plain integer type, but this
 129      field will be the enum type.  */
 130   tree original_type;
 131 };
 132
 133 /* A kind of type specifier.  Note that this information is currently
 134    only used to distinguish tag definitions, tag references and typeof
 135    uses.  */
 136 enum c_typespec_kind {
 137   /* A reserved keyword type specifier.  */
 138   ctsk_resword,
 139   /* A reference to a tag, previously declared, such as "struct foo".
 140      This includes where the previous declaration was as a different
 141      kind of tag, in which case this is only valid if shadowing that
 142      tag in an inner scope.  */
 143   ctsk_tagref,
 144   /* A reference to a tag, not previously declared in a visible
 145      scope.  */
 146   ctsk_tagfirstref,
 147   /* A definition of a tag such as "struct foo { int a; }".  */
 148   ctsk_tagdef,
 149   /* A typedef name.  */
 150   ctsk_typedef,
 151   /* An ObjC-specific kind of type specifier.  */
 152   ctsk_objc,
 153   /* A typeof specifier.  */
 154   ctsk_typeof
 155 };
 156
 157 /* A type specifier: this structure is created in the parser and
 158    passed to declspecs_add_type only.  */
 159 struct c_typespec {
 160   /* What kind of type specifier this is.  */
 161   enum c_typespec_kind kind;
 162   /* Whether the expression has operands suitable for use in constant
 163      expressions.  */
 164   bool expr_const_operands;
 165   /* The specifier itself.  */
 166   tree spec;
 167   /* An expression to be evaluated before the type specifier, in the
 168      case of typeof specifiers, or NULL otherwise or if no such
 169      expression is required for a particular typeof specifier.  In
 170      particular, when typeof is applied to an expression of variably
 171      modified type, that expression must be evaluated in order to
 172      determine array sizes that form part of the type, but the
 173      expression itself (as opposed to the array sizes) forms no part
 174      of the type and so needs to be recorded separately.  */
 175   tree expr;
 176 };
 177
 178 /* A storage class specifier.  */
 179 enum c_storage_class {
 180   csc_none,
 181   csc_auto,
 182   csc_extern,
 183   csc_register,
 184   csc_static,
 185   csc_typedef
 186 };
 187
 188 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 189    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 190    or none of these.  */
 191 enum c_typespec_keyword {
 192   cts_none,
 193   cts_void,
 194   cts_bool,
 195   cts_char,
 196   cts_int,
 197   cts_float,
 198   cts_int128,
 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   /* The storage class specifier, or csc_none if none.  */
 224   enum c_storage_class storage_class;
 225   /* Any type specifier keyword used such as "int", not reflecting
 226      modifiers such as "short", or cts_none if none.  */
 227   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 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 : 1;
 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 typedef struct GTY(()) c_arg_tag_d {
 299   /* The argument name.  */
 300   tree id;
 301   /* The type of the argument.  */
 302   tree type;
 303 } c_arg_tag;
 304
 305 DEF_VEC_O(c_arg_tag);
 306 DEF_VEC_ALLOC_O(c_arg_tag,gc);
 307
 308 /* Information about the parameters in a function declarator.  */
 309 struct c_arg_info {
 310   /* A list of parameter decls.  */
 311   tree parms;
 312   /* A list of structure, union and enum tags defined.  */
 313   VEC(c_arg_tag,gc) *tags;
 314   /* A list of argument types to go in the FUNCTION_TYPE.  */
 315   tree types;
 316   /* A list of non-parameter decls (notably enumeration constants)
 317      defined with the parameters.  */
 318   tree others;
 319   /* A VEC of VLA sizes from the parameters.  In a function
 320      definition, these are used to ensure that side-effects in sizes
 321      of arrays converted to pointers (such as a parameter int i[n++])
 322      take place; otherwise, they are ignored.  */
 323   VEC(tree,gc) *pending_sizes;
 324   /* True when these arguments had [*].  */
 325   BOOL_BITFIELD had_vla_unspec : 1;
 326 };
 327
 328 /* A declarator.  */
 329 struct c_declarator {
 330   /* The kind of declarator.  */
 331   enum c_declarator_kind kind;
 332   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 333   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 334   struct c_declarator *declarator;
 335   union {
 336     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 337        declarator.  */
 338     tree id;
 339     /* For functions.  */
 340     struct c_arg_info *arg_info;
 341     /* For arrays.  */
 342     struct {
 343       /* The array dimension, or NULL for [] and [*].  */
 344       tree dimen;
 345       /* The qualifiers inside [].  */
 346       int quals;
 347       /* The attributes (currently ignored) inside [].  */
 348       tree attrs;
 349       /* Whether [static] was used.  */
 350       BOOL_BITFIELD static_p : 1;
 351       /* Whether [*] was used.  */
 352       BOOL_BITFIELD vla_unspec_p : 1;
 353     } array;
 354     /* For pointers, the qualifiers on the pointer type.  */
 355     int pointer_quals;
 356     /* For attributes.  */
 357     tree attrs;
 358   } u;
 359 };
 360
 361 /* A type name.  */
 362 struct c_type_name {
 363   /* The declaration specifiers.  */
 364   struct c_declspecs *specs;
 365   /* The declarator.  */
 366   struct c_declarator *declarator;
 367 };
 368
 369 /* A parameter.  */
 370 struct c_parm {
 371   /* The declaration specifiers, minus any prefix attributes.  */
 372   struct c_declspecs *specs;
 373   /* The attributes.  */
 374   tree attrs;
 375   /* The declarator.  */
 376   struct c_declarator *declarator;
 377 };
 378
 379 /* Used when parsing an enum.  Initialized by start_enum.  */
 380 struct c_enum_contents
 381 {
 382   /* While defining an enum type, this is 1 plus the last enumerator
 383      constant value.  */
 384   tree enum_next_value;
 385
 386   /* Nonzero means that there was overflow computing enum_next_value.  */
 387   int enum_overflow;
 388 };
 389
 390 /* A type of reference to a static identifier in an inline
 391    function.  */
 392 enum c_inline_static_type {
 393   /* Identifier with internal linkage used in function that may be an
 394      inline definition (i.e., file-scope static).  */
 395   csi_internal,
 396   /* Modifiable object with static storage duration defined in
 397      function that may be an inline definition (i.e., local
 398      static).  */
 399   csi_modifiable
 400 };
 401
 402 \f
 403 /* in c-parser.c */
 404 extern void c_parse_init (void);
 405
 406 /* in c-aux-info.c */
 407 extern void gen_aux_info_record (tree, int, int, int);
 408
 409 /* in c-decl.c */
 410 struct c_spot_bindings;
 411 struct c_struct_parse_info;
 412 extern struct obstack parser_obstack;
 413 extern tree c_break_label;
 414 extern tree c_cont_label;
 415
 416 extern int global_bindings_p (void);
 417 extern void push_scope (void);
 418 extern tree pop_scope (void);
 419 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 420 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 421
 422 extern void record_inline_static (location_t, tree, tree,
 423                                   enum c_inline_static_type);
 424 extern void c_init_decl_processing (void);
 425 extern void c_print_identifier (FILE *, tree, int);
 426 extern int quals_from_declspecs (const struct c_declspecs *);
 427 extern struct c_declarator *build_array_declarator (location_t, tree,
 428                                                     struct c_declspecs *,
 429                                                     bool, bool);
 430 extern tree build_enumerator (location_t, struct c_enum_contents *, tree, tree);
 431 extern tree check_for_loop_decls (location_t);
 432 extern void mark_forward_parm_decls (void);
 433 extern void declare_parm_level (void);
 434 extern void undeclared_variable (location_t, tree);
 435 extern tree lookup_label_for_goto (location_t, tree);
 436 extern tree declare_label (tree);
 437 extern tree define_label (location_t, tree);
 438 extern struct c_spot_bindings *c_get_switch_bindings (void);
 439 extern void c_release_switch_bindings (struct c_spot_bindings *);
 440 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 441                                           location_t, location_t);
 442 extern void finish_decl (tree, location_t, tree, tree, tree);
 443 extern tree finish_enum (tree, tree, tree);
 444 extern void finish_function (void);
 445 extern tree finish_struct (location_t, tree, tree, tree,
 446                            struct c_struct_parse_info *);
 447 extern struct c_arg_info *build_arg_info (void);
 448 extern struct c_arg_info *get_parm_info (bool);
 449 extern tree grokfield (location_t, struct c_declarator *,
 450                        struct c_declspecs *, tree, tree *);
 451 extern tree groktypename (struct c_type_name *, tree *, bool *);
 452 extern tree grokparm (const struct c_parm *);
 453 extern tree implicitly_declare (location_t, tree);
 454 extern void keep_next_level (void);
 455 extern void pending_xref_error (void);
 456 extern void c_push_function_context (void);
 457 extern void c_pop_function_context (void);
 458 extern void push_parm_decl (const struct c_parm *);
 459 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 460                                                         struct c_declarator *);
 461 extern tree c_builtin_function (tree);
 462 extern tree c_builtin_function_ext_scope (tree);
 463 extern void shadow_tag (const struct c_declspecs *);
 464 extern void shadow_tag_warned (const struct c_declspecs *, int);
 465 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 466 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 467 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 468                         tree);
 469 extern tree start_struct (location_t, enum tree_code, tree,
 470                           struct c_struct_parse_info **);
 471 extern void store_parm_decls (void);
 472 extern void store_parm_decls_from (struct c_arg_info *);
 473 extern tree xref_tag (enum tree_code, tree);
 474 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 475 extern int c_expand_decl (tree);
 476 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 477                                     struct c_declarator *);
 478 extern struct c_declarator *build_attrs_declarator (tree,
 479                                                     struct c_declarator *);
 480 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 481                                                        struct c_declarator *);
 482 extern struct c_declarator *build_id_declarator (tree);
 483 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 484                                                      struct c_declarator *);
 485 extern struct c_declspecs *build_null_declspecs (void);
 486 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 487 extern struct c_declspecs *declspecs_add_type (location_t,
 488                                                struct c_declspecs *,
 489                                                struct c_typespec);
 490 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 491 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 492 extern struct c_declspecs *declspecs_add_addrspace (struct c_declspecs *,
 493                                                     addr_space_t);
 494 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 495
 496 /* in c-objc-common.c */
 497 extern bool c_objc_common_init (void);
 498 extern bool c_missing_noreturn_ok_p (tree);
 499 extern bool c_warn_unused_global_decl (const_tree);
 500 extern void c_initialize_diagnostics (diagnostic_context *);
 501 extern bool c_vla_unspec_p (tree x, tree fn);
 502
 503 /* in c-typeck.c */
 504 extern bool in_late_binary_op;
 505 extern int in_alignof;
 506 extern int in_sizeof;
 507 extern int in_typeof;
 508
 509 extern struct c_switch *c_switch_stack;
 510
 511 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 512 extern tree require_complete_type (tree);
 513 extern int same_translation_unit_p (const_tree, const_tree);
 514 extern int comptypes (tree, tree);
 515 extern int comptypes_check_different_types (tree, tree, bool *);
 516 extern bool c_vla_type_p (const_tree);
 517 extern bool c_mark_addressable (tree);
 518 extern void c_incomplete_type_error (const_tree, const_tree);
 519 extern tree c_type_promotes_to (tree);
 520 extern struct c_expr default_function_array_conversion (location_t,
 521                                                         struct c_expr);
 522 extern struct c_expr default_function_array_read_conversion (location_t,
 523                                                              struct c_expr);
 524 extern void mark_exp_read (tree);
 525 extern tree composite_type (tree, tree);
 526 extern tree build_component_ref (location_t, tree, tree);
 527 extern tree build_array_ref (location_t, tree, tree);
 528 extern tree build_external_ref (location_t, tree, int, tree *);
 529 extern void pop_maybe_used (bool);
 530 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 531 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 532 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 533                                             struct c_expr);
 534 extern struct c_expr parser_build_binary_op (location_t,
 535                                              enum tree_code, struct c_expr,
 536                                              struct c_expr);
 537 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 538                                     tree, tree);
 539 extern tree build_compound_expr (location_t, tree, tree);
 540 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 541 extern tree build_c_cast (location_t, tree, tree);
 542 extern void store_init_value (location_t, tree, tree, tree);
 543 extern void error_init (const char *);
 544 extern void pedwarn_init (location_t, int opt, const char *);
 545 extern void maybe_warn_string_init (tree, struct c_expr);
 546 extern void start_init (tree, tree, int);
 547 extern void finish_init (void);
 548 extern void really_start_incremental_init (tree);
 549 extern void push_init_level (int, struct obstack *);
 550 extern struct c_expr pop_init_level (int, struct obstack *);
 551 extern void set_init_index (tree, tree, struct obstack *);
 552 extern void set_init_label (tree, struct obstack *);
 553 extern void process_init_element (struct c_expr, bool, struct obstack *);
 554 extern tree build_compound_literal (location_t, tree, tree, bool);
 555 extern void check_compound_literal_type (location_t, struct c_type_name *);
 556 extern tree c_start_case (location_t, location_t, tree);
 557 extern void c_finish_case (tree);
 558 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 559 extern tree build_asm_stmt (tree, tree);
 560 extern int c_types_compatible_p (tree, tree);
 561 extern tree c_begin_compound_stmt (bool);
 562 extern tree c_end_compound_stmt (location_t, tree, bool);
 563 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 564 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 565 extern tree c_begin_stmt_expr (void);
 566 extern tree c_finish_stmt_expr (location_t, tree);
 567 extern tree c_process_expr_stmt (location_t, tree);
 568 extern tree c_finish_expr_stmt (location_t, tree);
 569 extern tree c_finish_return (location_t, tree, tree);
 570 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 571 extern tree c_finish_goto_label (location_t, tree);
 572 extern tree c_finish_goto_ptr (location_t, tree);
 573 extern tree c_expr_to_decl (tree, bool *, bool *);
 574 extern tree c_begin_omp_parallel (void);
 575 extern tree c_finish_omp_parallel (location_t, tree, tree);
 576 extern tree c_begin_omp_task (void);
 577 extern tree c_finish_omp_task (location_t, tree, tree);
 578 extern tree c_finish_omp_clauses (tree);
 579 extern tree c_build_va_arg (location_t, tree, tree);
 580
 581 /* Set to 0 at beginning of a function definition, set to 1 if
 582    a return statement that specifies a return value is seen.  */
 583
 584 extern int current_function_returns_value;
 585
 586 /* Set to 0 at beginning of a function definition, set to 1 if
 587    a return statement with no argument is seen.  */
 588
 589 extern int current_function_returns_null;
 590
 591 /* Set to 0 at beginning of a function definition, set to 1 if
 592    a call to a noreturn function is seen.  */
 593
 594 extern int current_function_returns_abnormally;
 595
 596 /* Nonzero means we are reading code that came from a system header file.  */
 597
 598 extern int system_header_p;
 599
 600 /* True means global_bindings_p should return false even if the scope stack
 601    says we are in file scope.  */
 602
 603 extern bool c_override_global_bindings_to_false;
 604
 605 /* In c-decl.c */
 606 extern void c_finish_incomplete_decl (tree);
 607 extern void c_write_global_declarations (void);
 608
 609 /* In c-errors.c */
 610 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 611 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 612
 613 #endif /* ! GCC_C_TREE_H */