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, 2011
   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         || (!prototype_p (TREE_TYPE (EXP))      \
 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 /* Type alias for struct c_expr. This allows to use the structure
 134    inside the VEC types.  */
 135 typedef struct c_expr c_expr_t;
 136
 137 /* A varray of c_expr_t.  */
 138 DEF_VEC_O (c_expr_t);
 139 DEF_VEC_ALLOC_O (c_expr_t, gc);
 140 DEF_VEC_ALLOC_O (c_expr_t, heap);
 141
 142 /* Append a new c_expr_t element to V.  */
 143 #define C_EXPR_APPEND(V, ELEM) \
 144   do { \
 145     c_expr_t *__elem_p = VEC_safe_push (c_expr_t, gc, V, NULL); \
 146     *__elem_p = (ELEM); \
 147   } while (0)
 148
 149 /* A kind of type specifier.  Note that this information is currently
 150    only used to distinguish tag definitions, tag references and typeof
 151    uses.  */
 152 enum c_typespec_kind {
 153   /* No typespec.  This appears only in struct c_declspec.  */
 154   ctsk_none,
 155   /* A reserved keyword type specifier.  */
 156   ctsk_resword,
 157   /* A reference to a tag, previously declared, such as "struct foo".
 158      This includes where the previous declaration was as a different
 159      kind of tag, in which case this is only valid if shadowing that
 160      tag in an inner scope.  */
 161   ctsk_tagref,
 162   /* A reference to a tag, not previously declared in a visible
 163      scope.  */
 164   ctsk_tagfirstref,
 165   /* A definition of a tag such as "struct foo { int a; }".  */
 166   ctsk_tagdef,
 167   /* A typedef name.  */
 168   ctsk_typedef,
 169   /* An ObjC-specific kind of type specifier.  */
 170   ctsk_objc,
 171   /* A typeof specifier.  */
 172   ctsk_typeof
 173 };
 174
 175 /* A type specifier: this structure is created in the parser and
 176    passed to declspecs_add_type only.  */
 177 struct c_typespec {
 178   /* What kind of type specifier this is.  */
 179   enum c_typespec_kind kind;
 180   /* Whether the expression has operands suitable for use in constant
 181      expressions.  */
 182   bool expr_const_operands;
 183   /* The specifier itself.  */
 184   tree spec;
 185   /* An expression to be evaluated before the type specifier, in the
 186      case of typeof specifiers, or NULL otherwise or if no such
 187      expression is required for a particular typeof specifier.  In
 188      particular, when typeof is applied to an expression of variably
 189      modified type, that expression must be evaluated in order to
 190      determine array sizes that form part of the type, but the
 191      expression itself (as opposed to the array sizes) forms no part
 192      of the type and so needs to be recorded separately.  */
 193   tree expr;
 194 };
 195
 196 /* A storage class specifier.  */
 197 enum c_storage_class {
 198   csc_none,
 199   csc_auto,
 200   csc_extern,
 201   csc_register,
 202   csc_static,
 203   csc_typedef
 204 };
 205
 206 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 207    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 208    or none of these.  */
 209 enum c_typespec_keyword {
 210   cts_none,
 211   cts_void,
 212   cts_bool,
 213   cts_char,
 214   cts_int,
 215   cts_float,
 216   cts_int128,
 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   /* The storage class specifier, or csc_none if none.  */
 242   enum c_storage_class storage_class;
 243   /* Any type specifier keyword used such as "int", not reflecting
 244      modifiers such as "short", or cts_none if none.  */
 245   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 246   /* The kind of type specifier if one has been seen, ctsk_none
 247      otherwise.  */
 248   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 249   /* Whether any expressions in typeof specifiers may appear in
 250      constant expressions.  */
 251   BOOL_BITFIELD expr_const_operands : 1;
 252   /* Whether any declaration specifiers have been seen at all.  */
 253   BOOL_BITFIELD declspecs_seen_p : 1;
 254   /* Whether something other than a storage class specifier or
 255      attribute has been seen.  This is used to warn for the
 256      obsolescent usage of storage class specifiers other than at the
 257      start of the list.  (Doing this properly would require function
 258      specifiers to be handled separately from storage class
 259      specifiers.)  */
 260   BOOL_BITFIELD non_sc_seen_p : 1;
 261   /* Whether the type is specified by a typedef or typeof name.  */
 262   BOOL_BITFIELD typedef_p : 1;
 263   /* Whether the type is explicitly "signed" or specified by a typedef
 264      whose type is explicitly "signed".  */
 265   BOOL_BITFIELD explicit_signed_p : 1;
 266   /* Whether the specifiers include a deprecated typedef.  */
 267   BOOL_BITFIELD deprecated_p : 1;
 268   /* Whether the type defaulted to "int" because there were no type
 269      specifiers.  */
 270   BOOL_BITFIELD default_int_p : 1;
 271   /* Whether "long" was specified.  */
 272   BOOL_BITFIELD long_p : 1;
 273   /* Whether "long" was specified more than once.  */
 274   BOOL_BITFIELD long_long_p : 1;
 275   /* Whether "short" was specified.  */
 276   BOOL_BITFIELD short_p : 1;
 277   /* Whether "signed" was specified.  */
 278   BOOL_BITFIELD signed_p : 1;
 279   /* Whether "unsigned" was specified.  */
 280   BOOL_BITFIELD unsigned_p : 1;
 281   /* Whether "complex" was specified.  */
 282   BOOL_BITFIELD complex_p : 1;
 283   /* Whether "inline" was specified.  */
 284   BOOL_BITFIELD inline_p : 1;
 285   /* Whether "_Noreturn" was speciied.  */
 286   BOOL_BITFIELD noreturn_p : 1;
 287   /* Whether "__thread" was specified.  */
 288   BOOL_BITFIELD thread_p : 1;
 289   /* Whether "const" was specified.  */
 290   BOOL_BITFIELD const_p : 1;
 291   /* Whether "volatile" was specified.  */
 292   BOOL_BITFIELD volatile_p : 1;
 293   /* Whether "restrict" was specified.  */
 294   BOOL_BITFIELD restrict_p : 1;
 295   /* Whether "_Sat" was specified.  */
 296   BOOL_BITFIELD saturating_p : 1;
 297   /* The address space that the declaration belongs to.  */
 298   addr_space_t address_space;
 299 };
 300
 301 /* The various kinds of declarators in C.  */
 302 enum c_declarator_kind {
 303   /* An identifier.  */
 304   cdk_id,
 305   /* A function.  */
 306   cdk_function,
 307   /* An array.  */
 308   cdk_array,
 309   /* A pointer.  */
 310   cdk_pointer,
 311   /* Parenthesized declarator with nested attributes.  */
 312   cdk_attrs
 313 };
 314
 315 typedef struct c_arg_tag_d {
 316   /* The argument name.  */
 317   tree id;
 318   /* The type of the argument.  */
 319   tree type;
 320 } c_arg_tag;
 321
 322 DEF_VEC_O(c_arg_tag);
 323 DEF_VEC_ALLOC_O(c_arg_tag,gc);
 324
 325 /* Information about the parameters in a function declarator.  */
 326 struct c_arg_info {
 327   /* A list of parameter decls.  */
 328   tree parms;
 329   /* A list of structure, union and enum tags defined.  */
 330   VEC(c_arg_tag,gc) *tags;
 331   /* A list of argument types to go in the FUNCTION_TYPE.  */
 332   tree types;
 333   /* A list of non-parameter decls (notably enumeration constants)
 334      defined with the parameters.  */
 335   tree others;
 336   /* A compound expression of VLA sizes from the parameters, or NULL.
 337      In a function definition, these are used to ensure that
 338      side-effects in sizes of arrays converted to pointers (such as a
 339      parameter int i[n++]) take place; otherwise, they are
 340      ignored.  */
 341   tree pending_sizes;
 342   /* True when these arguments had [*].  */
 343   BOOL_BITFIELD had_vla_unspec : 1;
 344 };
 345
 346 /* A declarator.  */
 347 struct c_declarator {
 348   /* The kind of declarator.  */
 349   enum c_declarator_kind kind;
 350   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 351   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 352   struct c_declarator *declarator;
 353   union {
 354     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 355        declarator.  */
 356     tree id;
 357     /* For functions.  */
 358     struct c_arg_info *arg_info;
 359     /* For arrays.  */
 360     struct {
 361       /* The array dimension, or NULL for [] and [*].  */
 362       tree dimen;
 363       /* The qualifiers inside [].  */
 364       int quals;
 365       /* The attributes (currently ignored) inside [].  */
 366       tree attrs;
 367       /* Whether [static] was used.  */
 368       BOOL_BITFIELD static_p : 1;
 369       /* Whether [*] was used.  */
 370       BOOL_BITFIELD vla_unspec_p : 1;
 371     } array;
 372     /* For pointers, the qualifiers on the pointer type.  */
 373     int pointer_quals;
 374     /* For attributes.  */
 375     tree attrs;
 376   } u;
 377 };
 378
 379 /* A type name.  */
 380 struct c_type_name {
 381   /* The declaration specifiers.  */
 382   struct c_declspecs *specs;
 383   /* The declarator.  */
 384   struct c_declarator *declarator;
 385 };
 386
 387 /* A parameter.  */
 388 struct c_parm {
 389   /* The declaration specifiers, minus any prefix attributes.  */
 390   struct c_declspecs *specs;
 391   /* The attributes.  */
 392   tree attrs;
 393   /* The declarator.  */
 394   struct c_declarator *declarator;
 395 };
 396
 397 /* Used when parsing an enum.  Initialized by start_enum.  */
 398 struct c_enum_contents
 399 {
 400   /* While defining an enum type, this is 1 plus the last enumerator
 401      constant value.  */
 402   tree enum_next_value;
 403
 404   /* Nonzero means that there was overflow computing enum_next_value.  */
 405   int enum_overflow;
 406 };
 407
 408 /* A type of reference to a static identifier in an inline
 409    function.  */
 410 enum c_inline_static_type {
 411   /* Identifier with internal linkage used in function that may be an
 412      inline definition (i.e., file-scope static).  */
 413   csi_internal,
 414   /* Modifiable object with static storage duration defined in
 415      function that may be an inline definition (i.e., local
 416      static).  */
 417   csi_modifiable
 418 };
 419
 420 \f
 421 /* in c-parser.c */
 422 extern void c_parse_init (void);
 423
 424 /* in c-aux-info.c */
 425 extern void gen_aux_info_record (tree, int, int, int);
 426
 427 /* in c-decl.c */
 428 struct c_spot_bindings;
 429 struct c_struct_parse_info;
 430 extern struct obstack parser_obstack;
 431 extern tree c_break_label;
 432 extern tree c_cont_label;
 433
 434 extern bool global_bindings_p (void);
 435 extern void push_scope (void);
 436 extern tree pop_scope (void);
 437 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 438 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 439
 440 extern void record_inline_static (location_t, tree, tree,
 441                                   enum c_inline_static_type);
 442 extern void c_init_decl_processing (void);
 443 extern void c_print_identifier (FILE *, tree, int);
 444 extern int quals_from_declspecs (const struct c_declspecs *);
 445 extern struct c_declarator *build_array_declarator (location_t, tree,
 446                                                     struct c_declspecs *,
 447                                                     bool, bool);
 448 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 449                               tree, tree);
 450 extern tree check_for_loop_decls (location_t, bool);
 451 extern void mark_forward_parm_decls (void);
 452 extern void declare_parm_level (void);
 453 extern void undeclared_variable (location_t, tree);
 454 extern tree lookup_label_for_goto (location_t, tree);
 455 extern tree declare_label (tree);
 456 extern tree define_label (location_t, tree);
 457 extern struct c_spot_bindings *c_get_switch_bindings (void);
 458 extern void c_release_switch_bindings (struct c_spot_bindings *);
 459 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 460                                           location_t, location_t);
 461 extern void finish_decl (tree, location_t, tree, tree, tree);
 462 extern tree finish_enum (tree, tree, tree);
 463 extern void finish_function (void);
 464 extern tree finish_struct (location_t, tree, tree, tree,
 465                            struct c_struct_parse_info *);
 466 extern struct c_arg_info *build_arg_info (void);
 467 extern struct c_arg_info *get_parm_info (bool, tree);
 468 extern tree grokfield (location_t, struct c_declarator *,
 469                        struct c_declspecs *, tree, tree *);
 470 extern tree groktypename (struct c_type_name *, tree *, bool *);
 471 extern tree grokparm (const struct c_parm *, tree *);
 472 extern tree implicitly_declare (location_t, tree);
 473 extern void keep_next_level (void);
 474 extern void pending_xref_error (void);
 475 extern void c_push_function_context (void);
 476 extern void c_pop_function_context (void);
 477 extern void push_parm_decl (const struct c_parm *, tree *);
 478 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 479                                                         struct c_declarator *);
 480 extern tree c_builtin_function (tree);
 481 extern tree c_builtin_function_ext_scope (tree);
 482 extern void shadow_tag (const struct c_declspecs *);
 483 extern void shadow_tag_warned (const struct c_declspecs *, int);
 484 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 485 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 486 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 487                         tree);
 488 extern tree start_struct (location_t, enum tree_code, tree,
 489                           struct c_struct_parse_info **);
 490 extern void store_parm_decls (void);
 491 extern void store_parm_decls_from (struct c_arg_info *);
 492 extern tree xref_tag (enum tree_code, tree);
 493 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 494 extern int c_expand_decl (tree);
 495 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 496                                     struct c_declarator *);
 497 extern struct c_declarator *build_attrs_declarator (tree,
 498                                                     struct c_declarator *);
 499 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 500                                                        struct c_declarator *);
 501 extern struct c_declarator *build_id_declarator (tree);
 502 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 503                                                      struct c_declarator *);
 504 extern struct c_declspecs *build_null_declspecs (void);
 505 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 506 extern struct c_declspecs *declspecs_add_type (location_t,
 507                                                struct c_declspecs *,
 508                                                struct c_typespec);
 509 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 510 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 511 extern struct c_declspecs *declspecs_add_addrspace (struct c_declspecs *,
 512                                                     addr_space_t);
 513 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 514
 515 /* in c-objc-common.c */
 516 extern bool c_objc_common_init (void);
 517 extern bool c_missing_noreturn_ok_p (tree);
 518 extern bool c_warn_unused_global_decl (const_tree);
 519 extern void c_initialize_diagnostics (diagnostic_context *);
 520 extern bool c_vla_unspec_p (tree x, tree fn);
 521
 522 /* in c-typeck.c */
 523 extern int in_alignof;
 524 extern int in_sizeof;
 525 extern int in_typeof;
 526
 527 extern struct c_switch *c_switch_stack;
 528
 529 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 530 extern tree require_complete_type (tree);
 531 extern int same_translation_unit_p (const_tree, const_tree);
 532 extern int comptypes (tree, tree);
 533 extern int comptypes_check_different_types (tree, tree, bool *);
 534 extern bool c_vla_type_p (const_tree);
 535 extern bool c_mark_addressable (tree);
 536 extern void c_incomplete_type_error (const_tree, const_tree);
 537 extern tree c_type_promotes_to (tree);
 538 extern struct c_expr default_function_array_conversion (location_t,
 539                                                         struct c_expr);
 540 extern struct c_expr default_function_array_read_conversion (location_t,
 541                                                              struct c_expr);
 542 extern void mark_exp_read (tree);
 543 extern tree composite_type (tree, tree);
 544 extern tree build_component_ref (location_t, tree, tree);
 545 extern tree build_array_ref (location_t, tree, tree);
 546 extern tree build_external_ref (location_t, tree, int, tree *);
 547 extern void pop_maybe_used (bool);
 548 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 549 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 550 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 551                                             struct c_expr);
 552 extern struct c_expr parser_build_binary_op (location_t,
 553                                              enum tree_code, struct c_expr,
 554                                              struct c_expr);
 555 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 556                                     tree, tree);
 557 extern tree build_compound_expr (location_t, tree, tree);
 558 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 559 extern tree build_c_cast (location_t, tree, tree);
 560 extern void store_init_value (location_t, tree, tree, tree);
 561 extern void error_init (const char *);
 562 extern void pedwarn_init (location_t, int opt, const char *);
 563 extern void maybe_warn_string_init (tree, struct c_expr);
 564 extern void start_init (tree, tree, int);
 565 extern void finish_init (void);
 566 extern void really_start_incremental_init (tree);
 567 extern void push_init_level (int, struct obstack *);
 568 extern struct c_expr pop_init_level (int, struct obstack *);
 569 extern void set_init_index (tree, tree, struct obstack *);
 570 extern void set_init_label (tree, struct obstack *);
 571 extern void process_init_element (struct c_expr, bool, struct obstack *);
 572 extern tree build_compound_literal (location_t, tree, tree, bool);
 573 extern void check_compound_literal_type (location_t, struct c_type_name *);
 574 extern tree c_start_case (location_t, location_t, tree);
 575 extern void c_finish_case (tree);
 576 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 577 extern tree build_asm_stmt (tree, tree);
 578 extern int c_types_compatible_p (tree, tree);
 579 extern tree c_begin_compound_stmt (bool);
 580 extern tree c_end_compound_stmt (location_t, tree, bool);
 581 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 582 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 583 extern tree c_begin_stmt_expr (void);
 584 extern tree c_finish_stmt_expr (location_t, tree);
 585 extern tree c_process_expr_stmt (location_t, tree);
 586 extern tree c_finish_expr_stmt (location_t, tree);
 587 extern tree c_finish_return (location_t, tree, tree);
 588 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 589 extern tree c_finish_goto_label (location_t, tree);
 590 extern tree c_finish_goto_ptr (location_t, tree);
 591 extern tree c_expr_to_decl (tree, bool *, bool *);
 592 extern tree c_begin_omp_parallel (void);
 593 extern tree c_finish_omp_parallel (location_t, tree, tree);
 594 extern tree c_begin_omp_task (void);
 595 extern tree c_finish_omp_task (location_t, tree, tree);
 596 extern tree c_finish_omp_clauses (tree);
 597 extern tree c_build_va_arg (location_t, tree, tree);
 598 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree);
 599
 600 /* Set to 0 at beginning of a function definition, set to 1 if
 601    a return statement that specifies a return value is seen.  */
 602
 603 extern int current_function_returns_value;
 604
 605 /* Set to 0 at beginning of a function definition, set to 1 if
 606    a return statement with no argument is seen.  */
 607
 608 extern int current_function_returns_null;
 609
 610 /* Set to 0 at beginning of a function definition, set to 1 if
 611    a call to a noreturn function is seen.  */
 612
 613 extern int current_function_returns_abnormally;
 614
 615 /* Nonzero means we are reading code that came from a system header file.  */
 616
 617 extern int system_header_p;
 618
 619 /* In c-decl.c */
 620 extern void c_finish_incomplete_decl (tree);
 621 extern void c_write_global_declarations (void);
 622
 623 /* In c-errors.c */
 624 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 625 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 626
 627 #endif /* ! GCC_C_TREE_H */