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 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 2, 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 COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_C_TREE_H
  23 #define GCC_C_TREE_H
  24
  25 #include "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 /* 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 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 132    N.B. Could be simplified if all built-in decls had complete prototypes
 133    (but this is presently difficult because some of them need FILE*).  */
 134 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 135        (EXP == 0                                        \
 136         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 137             && !DECL_BUILT_IN (EXP)))
 138
 139 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 140    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 141    without prototypes.  */
 142 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 143
 144 /* Record parser information about an expression that is irrelevant
 145    for code generation alongside a tree representing its value.  */
 146 struct c_expr
 147 {
 148   /* The value of the expression.  */
 149   tree value;
 150   /* Record the original binary operator of an expression, which may
 151      have been changed by fold, STRING_CST for unparenthesized string
 152      constants, or ERROR_MARK for other expressions (including
 153      parenthesized expressions).  */
 154   enum tree_code original_code;
 155 };
 156
 157 /* A kind of type specifier.  Note that this information is currently
 158    only used to distinguish tag definitions, tag references and typeof
 159    uses.  */
 160 enum c_typespec_kind {
 161   /* A reserved keyword type specifier.  */
 162   ctsk_resword,
 163   /* A reference to a tag, previously declared, such as "struct foo".
 164      This includes where the previous declaration was as a different
 165      kind of tag, in which case this is only valid if shadowing that
 166      tag in an inner scope.  */
 167   ctsk_tagref,
 168   /* A reference to a tag, not previously declared in a visible
 169      scope.  */
 170   ctsk_tagfirstref,
 171   /* A definition of a tag such as "struct foo { int a; }".  */
 172   ctsk_tagdef,
 173   /* A typedef name.  */
 174   ctsk_typedef,
 175   /* An ObjC-specific kind of type specifier.  */
 176   ctsk_objc,
 177   /* A typeof specifier.  */
 178   ctsk_typeof
 179 };
 180
 181 /* A type specifier: this structure is created in the parser and
 182    passed to declspecs_add_type only.  */
 183 struct c_typespec {
 184   /* What kind of type specifier this is.  */
 185   enum c_typespec_kind kind;
 186   /* The specifier itself.  */
 187   tree spec;
 188 };
 189
 190 /* A storage class specifier.  */
 191 enum c_storage_class {
 192   csc_none,
 193   csc_auto,
 194   csc_extern,
 195   csc_register,
 196   csc_static,
 197   csc_typedef
 198 };
 199
 200 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 201    "double", or none of these.  */
 202 enum c_typespec_keyword {
 203   cts_none,
 204   cts_void,
 205   cts_bool,
 206   cts_char,
 207   cts_int,
 208   cts_float,
 209   cts_double
 210 };
 211
 212 /* A sequence of declaration specifiers in C.  */
 213 struct c_declspecs {
 214   /* The type specified, if a single type specifier such as a struct,
 215      union or enum specifier, typedef name or typeof specifies the
 216      whole type, or NULL_TREE if none or a keyword such as "void" or
 217      "char" is used.  Does not include qualifiers.  */
 218   tree type;
 219   /* The attributes from a typedef decl.  */
 220   tree decl_attr;
 221   /* When parsing, the attributes.  Outside the parser, this will be
 222      NULL; attributes (possibly from multiple lists) will be passed
 223      separately.  */
 224   tree attrs;
 225   /* Any type specifier keyword used such as "int", not reflecting
 226      modifiers such as "short", or cts_none if none.  */
 227   enum c_typespec_keyword typespec_word;
 228   /* The storage class specifier, or csc_none if none.  */
 229   enum c_storage_class storage_class;
 230   /* Whether any declaration specifiers have been seen at all.  */
 231   BOOL_BITFIELD declspecs_seen_p : 1;
 232   /* Whether a type specifier has been seen.  */
 233   BOOL_BITFIELD type_seen_p : 1;
 234   /* Whether something other than a storage class specifier or
 235      attribute has been seen.  This is used to warn for the
 236      obsolescent usage of storage class specifiers other than at the
 237      start of the list.  (Doing this properly would require function
 238      specifiers to be handled separately from storage class
 239      specifiers.)  */
 240   BOOL_BITFIELD non_sc_seen_p : 1;
 241   /* Whether the type is specified by a typedef or typeof name.  */
 242   BOOL_BITFIELD typedef_p : 1;
 243   /* Whether a struct, union or enum type either had its content
 244      defined by a type specifier in the list or was the first visible
 245      declaration of its tag.  */
 246   BOOL_BITFIELD tag_defined_p : 1;
 247   /* Whether the type is explicitly "signed" or specified by a typedef
 248      whose type is explicitly "signed".  */
 249   BOOL_BITFIELD explicit_signed_p : 1;
 250   /* Whether the specifiers include a deprecated typedef.  */
 251   BOOL_BITFIELD deprecated_p : 1;
 252   /* Whether the type defaulted to "int" because there were no type
 253      specifiers.  */
 254   BOOL_BITFIELD default_int_p;
 255   /* Whether "long" was specified.  */
 256   BOOL_BITFIELD long_p : 1;
 257   /* Whether "long" was specified more than once.  */
 258   BOOL_BITFIELD long_long_p : 1;
 259   /* Whether "short" was specified.  */
 260   BOOL_BITFIELD short_p : 1;
 261   /* Whether "signed" was specified.  */
 262   BOOL_BITFIELD signed_p : 1;
 263   /* Whether "unsigned" was specified.  */
 264   BOOL_BITFIELD unsigned_p : 1;
 265   /* Whether "complex" was specified.  */
 266   BOOL_BITFIELD complex_p : 1;
 267   /* Whether "inline" was specified.  */
 268   BOOL_BITFIELD inline_p : 1;
 269   /* Whether "__thread" was specified.  */
 270   BOOL_BITFIELD thread_p : 1;
 271   /* Whether "const" was specified.  */
 272   BOOL_BITFIELD const_p : 1;
 273   /* Whether "volatile" was specified.  */
 274   BOOL_BITFIELD volatile_p : 1;
 275   /* Whether "restrict" was specified.  */
 276   BOOL_BITFIELD restrict_p : 1;
 277 };
 278
 279 /* The various kinds of declarators in C.  */
 280 enum c_declarator_kind {
 281   /* An identifier.  */
 282   cdk_id,
 283   /* A function.  */
 284   cdk_function,
 285   /* An array.  */
 286   cdk_array,
 287   /* A pointer.  */
 288   cdk_pointer,
 289   /* Parenthesized declarator with nested attributes.  */
 290   cdk_attrs
 291 };
 292
 293 /* Information about the parameters in a function declarator.  */
 294 struct c_arg_info {
 295   /* A list of parameter decls.  */
 296   tree parms;
 297   /* A list of structure, union and enum tags defined.  */
 298   tree tags;
 299   /* A list of argument types to go in the FUNCTION_TYPE.  */
 300   tree types;
 301   /* A list of non-parameter decls (notably enumeration constants)
 302      defined with the parameters.  */
 303   tree others;
 304 };
 305
 306 /* A declarator.  */
 307 struct c_declarator {
 308   /* The kind of declarator.  */
 309   enum c_declarator_kind kind;
 310   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 311   struct c_declarator *declarator;
 312   location_t id_loc; /* Currently only set for cdk_id. */
 313   union {
 314     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 315        declarator.  */
 316     tree id;
 317     /* For functions.  */
 318     struct c_arg_info *arg_info;
 319     /* For arrays.  */
 320     struct {
 321       /* The array dimension, or NULL for [] and [*].  */
 322       tree dimen;
 323       /* The qualifiers inside [].  */
 324       int quals;
 325       /* The attributes (currently ignored) inside [].  */
 326       tree attrs;
 327       /* Whether [static] was used.  */
 328       BOOL_BITFIELD static_p : 1;
 329       /* Whether [*] was used.  */
 330       BOOL_BITFIELD vla_unspec_p : 1;
 331     } array;
 332     /* For pointers, the qualifiers on the pointer type.  */
 333     int pointer_quals;
 334     /* For attributes.  */
 335     tree attrs;
 336   } u;
 337 };
 338
 339 /* A type name.  */
 340 struct c_type_name {
 341   /* The declaration specifiers.  */
 342   struct c_declspecs *specs;
 343   /* The declarator.  */
 344   struct c_declarator *declarator;
 345 };
 346
 347 /* A parameter.  */
 348 struct c_parm {
 349   /* The declaration specifiers, minus any prefix attributes.  */
 350   struct c_declspecs *specs;
 351   /* The attributes.  */
 352   tree attrs;
 353   /* The declarator.  */
 354   struct c_declarator *declarator;
 355 };
 356
 357 /* Save and restore the variables in this file and elsewhere
 358    that keep track of the progress of compilation of the current function.
 359    Used for nested functions.  */
 360
 361 struct language_function GTY(())
 362 {
 363   struct c_language_function base;
 364   tree x_break_label;
 365   tree x_cont_label;
 366   struct c_switch * GTY((skip)) x_switch_stack;
 367   struct c_arg_info * GTY((skip)) arg_info;
 368   int returns_value;
 369   int returns_null;
 370   int returns_abnormally;
 371   int warn_about_return_type;
 372   int extern_inline;
 373 };
 374
 375 /* Save lists of labels used or defined in particular contexts.
 376    Allocated on the parser obstack.  */
 377
 378 struct c_label_list
 379 {
 380   /* The label at the head of the list.  */
 381   tree label;
 382   /* The rest of the list.  */
 383   struct c_label_list *next;
 384 };
 385
 386 /* Statement expression context.  */
 387
 388 struct c_label_context_se
 389 {
 390   /* The labels defined at this level of nesting.  */
 391   struct c_label_list *labels_def;
 392   /* The labels used at this level of nesting.  */
 393   struct c_label_list *labels_used;
 394   /* The next outermost context.  */
 395   struct c_label_context_se *next;
 396 };
 397
 398 /* Context of variably modified declarations.  */
 399
 400 struct c_label_context_vm
 401 {
 402   /* The labels defined at this level of nesting.  */
 403   struct c_label_list *labels_def;
 404   /* The labels used at this level of nesting.  */
 405   struct c_label_list *labels_used;
 406   /* The scope of this context.  Multiple contexts may be at the same
 407      numbered scope, since each variably modified declaration starts a
 408      new context.  */
 409   unsigned scope;
 410   /* The next outermost context.  */
 411   struct c_label_context_vm *next;
 412 };
 413
 414 \f
 415 /* in c-parser.c */
 416 extern void c_parse_init (void);
 417
 418 /* in c-aux-info.c */
 419 extern void gen_aux_info_record (tree, int, int, int);
 420
 421 /* in c-decl.c */
 422 extern struct obstack parser_obstack;
 423 extern tree c_break_label;
 424 extern tree c_cont_label;
 425
 426 extern int global_bindings_p (void);
 427 extern void push_scope (void);
 428 extern tree pop_scope (void);
 429 extern void insert_block (tree);
 430 extern tree pushdecl (tree);
 431 extern void c_expand_body (tree);
 432
 433 extern void c_init_decl_processing (void);
 434 extern void c_dup_lang_specific_decl (tree);
 435 extern void c_print_identifier (FILE *, tree, int);
 436 extern int quals_from_declspecs (const struct c_declspecs *);
 437 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 438                                                     bool, bool);
 439 extern tree build_enumerator (tree, tree);
 440 extern void check_for_loop_decls (void);
 441 extern void mark_forward_parm_decls (void);
 442 extern void declare_parm_level (void);
 443 extern void undeclared_variable (tree, location_t);
 444 extern tree declare_label (tree);
 445 extern tree define_label (location_t, tree);
 446 extern void finish_decl (tree, tree, tree);
 447 extern tree finish_enum (tree, tree, tree);
 448 extern void finish_function (void);
 449 extern tree finish_struct (tree, tree, tree);
 450 extern struct c_arg_info *get_parm_info (bool);
 451 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
 452 extern tree groktypename (struct c_type_name *);
 453 extern tree grokparm (const struct c_parm *);
 454 extern tree implicitly_declare (tree);
 455 extern void keep_next_level (void);
 456 extern tree lookup_name (tree);
 457 extern void pending_xref_error (void);
 458 extern void c_push_function_context (struct function *);
 459 extern void c_pop_function_context (struct function *);
 460 extern void push_parm_decl (const struct c_parm *);
 461 extern tree pushdecl_top_level (tree);
 462 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 463                                                         struct c_declarator *,
 464                                                         bool);
 465 extern tree builtin_function (const char *, tree, int, enum built_in_class,
 466                               const char *, tree);
 467 extern void shadow_tag (const struct c_declspecs *);
 468 extern void shadow_tag_warned (const struct c_declspecs *, int);
 469 extern tree start_enum (tree);
 470 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 471 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 472                         tree);
 473 extern tree start_struct (enum tree_code, tree);
 474 extern void store_parm_decls (void);
 475 extern void store_parm_decls_from (struct c_arg_info *);
 476 extern tree xref_tag (enum tree_code, tree);
 477 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 478 extern int c_expand_decl (tree);
 479 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 480                                     struct c_declarator *);
 481 extern struct c_declarator *build_attrs_declarator (tree,
 482                                                     struct c_declarator *);
 483 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 484                                                        struct c_declarator *);
 485 extern struct c_declarator *build_id_declarator (tree);
 486 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 487                                                      struct c_declarator *);
 488 extern struct c_declspecs *build_null_declspecs (void);
 489 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 490 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 491                                                struct c_typespec);
 492 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 493 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 494 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 495
 496 /* in c-objc-common.c */
 497 extern int c_disregard_inline_limits (tree);
 498 extern int c_cannot_inline_tree_fn (tree *);
 499 extern bool c_objc_common_init (void);
 500 extern bool c_missing_noreturn_ok_p (tree);
 501 extern tree c_objc_common_truthvalue_conversion (tree expr);
 502 extern bool c_warn_unused_global_decl (tree);
 503 extern void c_initialize_diagnostics (diagnostic_context *);
 504
 505 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 506   c_build_qualified_type ((TYPE),                                 \
 507                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 508                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 509
 510 /* in c-typeck.c */
 511 extern int in_alignof;
 512 extern int in_sizeof;
 513 extern int in_typeof;
 514
 515 extern struct c_switch *c_switch_stack;
 516 extern struct c_label_context_se *label_context_stack_se;
 517 extern struct c_label_context_vm *label_context_stack_vm;
 518
 519 extern tree require_complete_type (tree);
 520 extern int same_translation_unit_p (tree, tree);
 521 extern int comptypes (tree, tree);
 522 extern bool c_mark_addressable (tree);
 523 extern void c_incomplete_type_error (tree, tree);
 524 extern tree c_type_promotes_to (tree);
 525 extern tree default_conversion (tree);
 526 extern tree composite_type (tree, tree);
 527 extern tree build_component_ref (tree, tree);
 528 extern tree build_indirect_ref (tree, const char *);
 529 extern tree build_array_ref (tree, tree);
 530 extern tree build_external_ref (tree, int, location_t);
 531 extern void pop_maybe_used (bool);
 532 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 533 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 534 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr);
 535 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
 536                                              struct c_expr);
 537 extern tree build_conditional_expr (tree, tree, tree);
 538 extern tree build_compound_expr (tree, tree);
 539 extern tree c_cast_expr (struct c_type_name *, tree);
 540 extern tree build_c_cast (tree, tree);
 541 extern tree build_modify_expr (tree, enum tree_code, tree);
 542 extern void store_init_value (tree, tree);
 543 extern void error_init (const char *);
 544 extern void pedwarn_init (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);
 550 extern struct c_expr pop_init_level (int);
 551 extern void set_init_index (tree, tree);
 552 extern void set_init_label (tree);
 553 extern void process_init_element (struct c_expr);
 554 extern tree build_compound_literal (tree, tree);
 555 extern tree c_start_case (tree);
 556 extern void c_finish_case (tree);
 557 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 558 extern tree build_asm_stmt (tree, tree);
 559 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 560 extern int c_types_compatible_p (tree, tree);
 561 extern tree c_begin_compound_stmt (bool);
 562 extern tree c_end_compound_stmt (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 (tree);
 567 extern tree c_process_expr_stmt (tree);
 568 extern tree c_finish_expr_stmt (tree);
 569 extern tree c_finish_return (tree);
 570 extern tree c_finish_bc_stmt (tree *, bool);
 571 extern tree c_finish_goto_label (tree);
 572 extern tree c_finish_goto_ptr (tree);
 573 extern void c_begin_vm_scope (unsigned int);
 574 extern void c_end_vm_scope (unsigned int);
 575
 576 /* Set to 0 at beginning of a function definition, set to 1 if
 577    a return statement that specifies a return value is seen.  */
 578
 579 extern int current_function_returns_value;
 580
 581 /* Set to 0 at beginning of a function definition, set to 1 if
 582    a return statement with no argument is seen.  */
 583
 584 extern int current_function_returns_null;
 585
 586 /* Set to 0 at beginning of a function definition, set to 1 if
 587    a call to a noreturn function is seen.  */
 588
 589 extern int current_function_returns_abnormally;
 590
 591 /* Nonzero means we are reading code that came from a system header file.  */
 592
 593 extern int system_header_p;
 594
 595 /* True means global_bindings_p should return false even if the scope stack
 596    says we are in file scope.  */
 597
 598 extern bool c_override_global_bindings_to_false;
 599
 600 /* True means we've initialized exception handling.  */
 601 extern bool c_eh_initialized_p;
 602
 603 /* In c-decl.c */
 604 extern void c_finish_incomplete_decl (tree);
 605 extern void c_write_global_declarations (void);
 606
 607 /* In order for the format checking to accept the C frontend
 608    diagnostic framework extensions, you must include this file before
 609    toplev.h, not after.  */
 610 #define GCC_DIAG_STYLE __gcc_cdiag__
 611 #if GCC_VERSION >= 3005
 612 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 613 #else
 614 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 615 #endif
 616
 617 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 618 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 619
 620 #endif /* ! GCC_C_TREE_H */