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 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_C_TREE_H
  22 #define GCC_C_TREE_H
  23
  24 #include "c-common.h"
  25 #include "toplev.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 /* Language-specific declaration information.  */
  34
  35 struct lang_decl GTY(())
  36 {
  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 lang_type GTY(())
  60 {
  61   /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  62   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
  63   /* In an ENUMERAL_TYPE, the min and max values.  */
  64   tree enum_min;
  65   tree enum_max;
  66   /* In a RECORD_TYPE, information specific to Objective-C, such
  67      as a list of adopted protocols or a pointer to a corresponding
  68      @interface.  See objc/objc-act.h for details.  */
  69   tree objc_info;
  70 };
  71
  72 /* Record whether a type or decl was written with nonconstant size.
  73    Note that TYPE_SIZE may have simplified to a constant.  */
  74 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  75 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  76
  77 /* Record whether a typedef for type `int' was actually `signed int'.  */
  78 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  79
  80 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  81    return type.  */
  82 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  83
  84 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  85 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  86
  87 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  88    been declared.  */
  89 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  90   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  91
  92 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  93    built-in prototype and does not have a non-built-in prototype.  */
  94 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  95   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  96
  97 /* Record whether a decl was declared register.  This is strictly a
  98    front-end flag, whereas DECL_REGISTER is used for code generation;
  99    they may differ for structures with volatile fields.  */
 100 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
 101
 102 /* Record whether a decl was used in an expression anywhere except an
 103    unevaluated operand of sizeof / typeof / alignof.  This is only
 104    used for functions declared static but not defined, though outside
 105    sizeof and typeof it is set for other function decls as well.  */
 106 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
 107
 108 /* Record whether a label was defined in a statement expression which
 109    has finished and so can no longer be jumped to.  */
 110 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP)        \
 111   DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
 112
 113 /* Record whether a label was the subject of a goto from outside the
 114    current level of statement expression nesting and so cannot be
 115    defined right now.  */
 116 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP)       \
 117   DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
 118
 119 /* Record whether a label was defined in the scope of an identifier
 120    with variably modified type which has finished and so can no longer
 121    be jumped to.  */
 122 #define C_DECL_UNJUMPABLE_VM(EXP)       \
 123   DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP))
 124
 125 /* Record whether a label was the subject of a goto from outside the
 126    current level of scopes of identifiers with variably modified type
 127    and so cannot be defined right now.  */
 128 #define C_DECL_UNDEFINABLE_VM(EXP)      \
 129   DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP))
 130
 131 /* Record whether a variable has been declared threadprivate by
 132    #pragma omp threadprivate.  */
 133 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
 134
 135 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 136    N.B. Could be simplified if all built-in decls had complete prototypes
 137    (but this is presently difficult because some of them need FILE*).  */
 138 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 139        (EXP == 0                                        \
 140         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 141             && !DECL_BUILT_IN (EXP)))
 142
 143 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 144    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 145    without prototypes.  */
 146 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 147
 148 /* Record parser information about an expression that is irrelevant
 149    for code generation alongside a tree representing its value.  */
 150 struct c_expr
 151 {
 152   /* The value of the expression.  */
 153   tree value;
 154   /* Record the original binary operator of an expression, which may
 155      have been changed by fold, STRING_CST for unparenthesized string
 156      constants, or ERROR_MARK for other expressions (including
 157      parenthesized expressions).  */
 158   enum tree_code original_code;
 159 };
 160
 161 /* A kind of type specifier.  Note that this information is currently
 162    only used to distinguish tag definitions, tag references and typeof
 163    uses.  */
 164 enum c_typespec_kind {
 165   /* A reserved keyword type specifier.  */
 166   ctsk_resword,
 167   /* A reference to a tag, previously declared, such as "struct foo".
 168      This includes where the previous declaration was as a different
 169      kind of tag, in which case this is only valid if shadowing that
 170      tag in an inner scope.  */
 171   ctsk_tagref,
 172   /* A reference to a tag, not previously declared in a visible
 173      scope.  */
 174   ctsk_tagfirstref,
 175   /* A definition of a tag such as "struct foo { int a; }".  */
 176   ctsk_tagdef,
 177   /* A typedef name.  */
 178   ctsk_typedef,
 179   /* An ObjC-specific kind of type specifier.  */
 180   ctsk_objc,
 181   /* A typeof specifier.  */
 182   ctsk_typeof
 183 };
 184
 185 /* A type specifier: this structure is created in the parser and
 186    passed to declspecs_add_type only.  */
 187 struct c_typespec {
 188   /* What kind of type specifier this is.  */
 189   enum c_typespec_kind kind;
 190   /* The specifier itself.  */
 191   tree spec;
 192 };
 193
 194 /* A storage class specifier.  */
 195 enum c_storage_class {
 196   csc_none,
 197   csc_auto,
 198   csc_extern,
 199   csc_register,
 200   csc_static,
 201   csc_typedef
 202 };
 203
 204 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 205    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 206    or none of these.  */
 207 enum c_typespec_keyword {
 208   cts_none,
 209   cts_void,
 210   cts_bool,
 211   cts_char,
 212   cts_int,
 213   cts_float,
 214   cts_double,
 215   cts_dfloat32,
 216   cts_dfloat64,
 217   cts_dfloat128,
 218   cts_fract,
 219   cts_accum
 220 };
 221
 222 /* A sequence of declaration specifiers in C.  */
 223 struct c_declspecs {
 224   /* The type specified, if a single type specifier such as a struct,
 225      union or enum specifier, typedef name or typeof specifies the
 226      whole type, or NULL_TREE if none or a keyword such as "void" or
 227      "char" is used.  Does not include qualifiers.  */
 228   tree type;
 229   /* The attributes from a typedef decl.  */
 230   tree decl_attr;
 231   /* When parsing, the attributes.  Outside the parser, this will be
 232      NULL; attributes (possibly from multiple lists) will be passed
 233      separately.  */
 234   tree attrs;
 235   /* Any type specifier keyword used such as "int", not reflecting
 236      modifiers such as "short", or cts_none if none.  */
 237   enum c_typespec_keyword typespec_word;
 238   /* The storage class specifier, or csc_none if none.  */
 239   enum c_storage_class storage_class;
 240   /* Whether any declaration specifiers have been seen at all.  */
 241   BOOL_BITFIELD declspecs_seen_p : 1;
 242   /* Whether a type specifier has been seen.  */
 243   BOOL_BITFIELD type_seen_p : 1;
 244   /* Whether something other than a storage class specifier or
 245      attribute has been seen.  This is used to warn for the
 246      obsolescent usage of storage class specifiers other than at the
 247      start of the list.  (Doing this properly would require function
 248      specifiers to be handled separately from storage class
 249      specifiers.)  */
 250   BOOL_BITFIELD non_sc_seen_p : 1;
 251   /* Whether the type is specified by a typedef or typeof name.  */
 252   BOOL_BITFIELD typedef_p : 1;
 253   /* Whether a struct, union or enum type either had its content
 254      defined by a type specifier in the list or was the first visible
 255      declaration of its tag.  */
 256   BOOL_BITFIELD tag_defined_p : 1;
 257   /* Whether the type is explicitly "signed" or specified by a typedef
 258      whose type is explicitly "signed".  */
 259   BOOL_BITFIELD explicit_signed_p : 1;
 260   /* Whether the specifiers include a deprecated typedef.  */
 261   BOOL_BITFIELD deprecated_p : 1;
 262   /* Whether the type defaulted to "int" because there were no type
 263      specifiers.  */
 264   BOOL_BITFIELD default_int_p;
 265   /* Whether "long" was specified.  */
 266   BOOL_BITFIELD long_p : 1;
 267   /* Whether "long" was specified more than once.  */
 268   BOOL_BITFIELD long_long_p : 1;
 269   /* Whether "short" was specified.  */
 270   BOOL_BITFIELD short_p : 1;
 271   /* Whether "signed" was specified.  */
 272   BOOL_BITFIELD signed_p : 1;
 273   /* Whether "unsigned" was specified.  */
 274   BOOL_BITFIELD unsigned_p : 1;
 275   /* Whether "complex" was specified.  */
 276   BOOL_BITFIELD complex_p : 1;
 277   /* Whether "inline" was specified.  */
 278   BOOL_BITFIELD inline_p : 1;
 279   /* Whether "__thread" was specified.  */
 280   BOOL_BITFIELD thread_p : 1;
 281   /* Whether "const" was specified.  */
 282   BOOL_BITFIELD const_p : 1;
 283   /* Whether "volatile" was specified.  */
 284   BOOL_BITFIELD volatile_p : 1;
 285   /* Whether "restrict" was specified.  */
 286   BOOL_BITFIELD restrict_p : 1;
 287   /* Whether "_Sat" was specified.  */
 288   BOOL_BITFIELD saturating_p : 1;
 289 };
 290
 291 /* The various kinds of declarators in C.  */
 292 enum c_declarator_kind {
 293   /* An identifier.  */
 294   cdk_id,
 295   /* A function.  */
 296   cdk_function,
 297   /* An array.  */
 298   cdk_array,
 299   /* A pointer.  */
 300   cdk_pointer,
 301   /* Parenthesized declarator with nested attributes.  */
 302   cdk_attrs
 303 };
 304
 305 /* Information about the parameters in a function declarator.  */
 306 struct c_arg_info {
 307   /* A list of parameter decls.  */
 308   tree parms;
 309   /* A list of structure, union and enum tags defined.  */
 310   tree tags;
 311   /* A list of argument types to go in the FUNCTION_TYPE.  */
 312   tree types;
 313   /* A list of non-parameter decls (notably enumeration constants)
 314      defined with the parameters.  */
 315   tree others;
 316   /* A list of VLA sizes from the parameters.  In a function
 317      definition, these are used to ensure that side-effects in sizes
 318      of arrays converted to pointers (such as a parameter int i[n++])
 319      take place; otherwise, they are ignored.  */
 320   tree pending_sizes;
 321   /* True when these arguments had [*].  */
 322   BOOL_BITFIELD had_vla_unspec : 1;
 323 };
 324
 325 /* A declarator.  */
 326 struct c_declarator {
 327   /* The kind of declarator.  */
 328   enum c_declarator_kind kind;
 329   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 330   struct c_declarator *declarator;
 331   location_t id_loc; /* Currently only set for cdk_id. */
 332   union {
 333     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 334        declarator.  */
 335     tree id;
 336     /* For functions.  */
 337     struct c_arg_info *arg_info;
 338     /* For arrays.  */
 339     struct {
 340       /* The array dimension, or NULL for [] and [*].  */
 341       tree dimen;
 342       /* The qualifiers inside [].  */
 343       int quals;
 344       /* The attributes (currently ignored) inside [].  */
 345       tree attrs;
 346       /* Whether [static] was used.  */
 347       BOOL_BITFIELD static_p : 1;
 348       /* Whether [*] was used.  */
 349       BOOL_BITFIELD vla_unspec_p : 1;
 350     } array;
 351     /* For pointers, the qualifiers on the pointer type.  */
 352     int pointer_quals;
 353     /* For attributes.  */
 354     tree attrs;
 355   } u;
 356 };
 357
 358 /* A type name.  */
 359 struct c_type_name {
 360   /* The declaration specifiers.  */
 361   struct c_declspecs *specs;
 362   /* The declarator.  */
 363   struct c_declarator *declarator;
 364 };
 365
 366 /* A parameter.  */
 367 struct c_parm {
 368   /* The declaration specifiers, minus any prefix attributes.  */
 369   struct c_declspecs *specs;
 370   /* The attributes.  */
 371   tree attrs;
 372   /* The declarator.  */
 373   struct c_declarator *declarator;
 374 };
 375
 376 /* Save and restore the variables in this file and elsewhere
 377    that keep track of the progress of compilation of the current function.
 378    Used for nested functions.  */
 379
 380 struct language_function GTY(())
 381 {
 382   struct c_language_function base;
 383   tree x_break_label;
 384   tree x_cont_label;
 385   struct c_switch * GTY((skip)) x_switch_stack;
 386   struct c_arg_info * GTY((skip)) arg_info;
 387   int returns_value;
 388   int returns_null;
 389   int returns_abnormally;
 390   int warn_about_return_type;
 391 };
 392
 393 /* Save lists of labels used or defined in particular contexts.
 394    Allocated on the parser obstack.  */
 395
 396 struct c_label_list
 397 {
 398   /* The label at the head of the list.  */
 399   tree label;
 400   /* The rest of the list.  */
 401   struct c_label_list *next;
 402 };
 403
 404 /* Statement expression context.  */
 405
 406 struct c_label_context_se
 407 {
 408   /* The labels defined at this level of nesting.  */
 409   struct c_label_list *labels_def;
 410   /* The labels used at this level of nesting.  */
 411   struct c_label_list *labels_used;
 412   /* The next outermost context.  */
 413   struct c_label_context_se *next;
 414 };
 415
 416 /* Context of variably modified declarations.  */
 417
 418 struct c_label_context_vm
 419 {
 420   /* The labels defined at this level of nesting.  */
 421   struct c_label_list *labels_def;
 422   /* The labels used at this level of nesting.  */
 423   struct c_label_list *labels_used;
 424   /* The scope of this context.  Multiple contexts may be at the same
 425      numbered scope, since each variably modified declaration starts a
 426      new context.  */
 427   unsigned scope;
 428   /* The next outermost context.  */
 429   struct c_label_context_vm *next;
 430 };
 431
 432 /* Used when parsing an enum.  Initialized by start_enum.  */
 433 struct c_enum_contents
 434 {
 435   /* While defining an enum type, this is 1 plus the last enumerator
 436      constant value.  */
 437   tree enum_next_value;
 438
 439   /* Nonzero means that there was overflow computing enum_next_value.  */
 440   int enum_overflow;
 441 };
 442
 443 \f
 444 /* in c-parser.c */
 445 extern void c_parse_init (void);
 446
 447 /* in c-aux-info.c */
 448 extern void gen_aux_info_record (tree, int, int, int);
 449
 450 /* in c-decl.c */
 451 extern struct obstack parser_obstack;
 452 extern tree c_break_label;
 453 extern tree c_cont_label;
 454
 455 extern int global_bindings_p (void);
 456 extern void push_scope (void);
 457 extern tree pop_scope (void);
 458
 459 extern void c_init_decl_processing (void);
 460 extern void c_dup_lang_specific_decl (tree);
 461 extern void c_print_identifier (FILE *, tree, int);
 462 extern int quals_from_declspecs (const struct c_declspecs *);
 463 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 464                                                     bool, bool);
 465 extern tree build_enumerator (struct c_enum_contents *, tree, tree);
 466 extern tree check_for_loop_decls (void);
 467 extern void mark_forward_parm_decls (void);
 468 extern void declare_parm_level (void);
 469 extern void undeclared_variable (tree, location_t);
 470 extern tree declare_label (tree);
 471 extern tree define_label (location_t, tree);
 472 extern void c_maybe_initialize_eh (void);
 473 extern void finish_decl (tree, tree, tree);
 474 extern tree finish_enum (tree, tree, tree);
 475 extern void finish_function (void);
 476 extern tree finish_struct (tree, tree, tree);
 477 extern struct c_arg_info *get_parm_info (bool);
 478 extern tree grokfield (struct c_declarator *, struct c_declspecs *,
 479                        tree, tree *);
 480 extern tree groktypename (struct c_type_name *);
 481 extern tree grokparm (const struct c_parm *);
 482 extern tree implicitly_declare (tree);
 483 extern void keep_next_level (void);
 484 extern void pending_xref_error (void);
 485 extern void c_push_function_context (void);
 486 extern void c_pop_function_context (void);
 487 extern void push_parm_decl (const struct c_parm *);
 488 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 489                                                         struct c_declarator *);
 490 extern tree c_builtin_function (tree);
 491 extern void shadow_tag (const struct c_declspecs *);
 492 extern void shadow_tag_warned (const struct c_declspecs *, int);
 493 extern tree start_enum (struct c_enum_contents *, tree);
 494 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 495 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 496                         tree);
 497 extern tree start_struct (enum tree_code, tree);
 498 extern void store_parm_decls (void);
 499 extern void store_parm_decls_from (struct c_arg_info *);
 500 extern tree xref_tag (enum tree_code, tree);
 501 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 502 extern int c_expand_decl (tree);
 503 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 504                                     struct c_declarator *);
 505 extern struct c_declarator *build_attrs_declarator (tree,
 506                                                     struct c_declarator *);
 507 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 508                                                        struct c_declarator *);
 509 extern struct c_declarator *build_id_declarator (tree);
 510 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 511                                                      struct c_declarator *);
 512 extern struct c_declspecs *build_null_declspecs (void);
 513 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 514 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 515                                                struct c_typespec);
 516 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 517 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 518 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 519
 520 /* in c-objc-common.c */
 521 extern bool c_objc_common_init (void);
 522 extern bool c_missing_noreturn_ok_p (tree);
 523 extern tree c_objc_common_truthvalue_conversion (tree expr);
 524 extern bool c_warn_unused_global_decl (const_tree);
 525 extern void c_initialize_diagnostics (diagnostic_context *);
 526 extern bool c_vla_unspec_p (tree x, tree fn);
 527
 528 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 529   c_build_qualified_type ((TYPE),                                 \
 530                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 531                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 532
 533 /* in c-typeck.c */
 534 extern int in_alignof;
 535 extern int in_sizeof;
 536 extern int in_typeof;
 537
 538 extern struct c_switch *c_switch_stack;
 539 extern struct c_label_context_se *label_context_stack_se;
 540 extern struct c_label_context_vm *label_context_stack_vm;
 541
 542 extern tree require_complete_type (tree);
 543 extern int same_translation_unit_p (const_tree, const_tree);
 544 extern int comptypes (tree, tree);
 545 extern bool c_vla_type_p (const_tree);
 546 extern bool c_mark_addressable (tree);
 547 extern void c_incomplete_type_error (const_tree, const_tree);
 548 extern tree c_type_promotes_to (tree);
 549 extern struct c_expr default_function_array_conversion (struct c_expr);
 550 extern tree composite_type (tree, tree);
 551 extern tree build_component_ref (tree, tree);
 552 extern tree build_array_ref (tree, tree);
 553 extern tree build_external_ref (tree, int, location_t);
 554 extern void pop_maybe_used (bool);
 555 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 556 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 557 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr);
 558 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
 559                                              struct c_expr);
 560 extern tree build_conditional_expr (tree, tree, tree);
 561 extern tree build_compound_expr (tree, tree);
 562 extern tree c_cast_expr (struct c_type_name *, tree);
 563 extern tree build_c_cast (tree, tree);
 564 extern void store_init_value (tree, tree);
 565 extern void error_init (const char *);
 566 extern void pedwarn_init (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);
 576 extern tree build_compound_literal (tree, tree);
 577 extern tree c_start_case (tree);
 578 extern void c_finish_case (tree);
 579 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 580 extern tree build_asm_stmt (tree, tree);
 581 extern int c_types_compatible_p (tree, tree);
 582 extern tree c_begin_compound_stmt (bool);
 583 extern tree c_end_compound_stmt (tree, bool);
 584 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 585 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 586 extern tree c_begin_stmt_expr (void);
 587 extern tree c_finish_stmt_expr (tree);
 588 extern tree c_process_expr_stmt (tree);
 589 extern tree c_finish_expr_stmt (tree);
 590 extern tree c_finish_return (tree);
 591 extern tree c_finish_bc_stmt (tree *, bool);
 592 extern tree c_finish_goto_label (tree);
 593 extern tree c_finish_goto_ptr (tree);
 594 extern void c_begin_vm_scope (unsigned int);
 595 extern void c_end_vm_scope (unsigned int);
 596 extern tree c_expr_to_decl (tree, bool *, bool *);
 597 extern tree c_begin_omp_parallel (void);
 598 extern tree c_finish_omp_parallel (tree, tree);
 599 extern tree c_finish_omp_clauses (tree);
 600
 601 /* Set to 0 at beginning of a function definition, set to 1 if
 602    a return statement that specifies a return value is seen.  */
 603
 604 extern int current_function_returns_value;
 605
 606 /* Set to 0 at beginning of a function definition, set to 1 if
 607    a return statement with no argument is seen.  */
 608
 609 extern int current_function_returns_null;
 610
 611 /* Set to 0 at beginning of a function definition, set to 1 if
 612    a call to a noreturn function is seen.  */
 613
 614 extern int current_function_returns_abnormally;
 615
 616 /* Nonzero means we are reading code that came from a system header file.  */
 617
 618 extern int system_header_p;
 619
 620 /* True means global_bindings_p should return false even if the scope stack
 621    says we are in file scope.  */
 622
 623 extern bool c_override_global_bindings_to_false;
 624
 625 /* True means we've initialized exception handling.  */
 626 extern bool c_eh_initialized_p;
 627
 628 /* In c-decl.c */
 629 extern void c_finish_incomplete_decl (tree);
 630 extern void c_write_global_declarations (void);
 631
 632 /* In order for the format checking to accept the C frontend
 633    diagnostic framework extensions, you must include this file before
 634    toplev.h, not after.  */
 635 #if GCC_VERSION >= 4001
 636 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 637 #else
 638 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 639 #endif
 640
 641 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 642 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 643
 644 #endif /* ! GCC_C_TREE_H */