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 /* For gc purposes, return the most likely link for the longest chain.  */
  34 #define C_LANG_TREE_NODE_CHAIN_NEXT(T)                          \
  35   ((union lang_tree_node *)                                     \
  36    (TREE_CODE (T) == INTEGER_TYPE ? TYPE_NEXT_VARIANT (T)       \
  37     : TREE_CODE (T) == COMPOUND_EXPR ? TREE_OPERAND (T, 1)      \
  38     : TREE_CHAIN (T)))
  39
  40 /* Language-specific declaration information.  */
  41
  42 struct lang_decl GTY(())
  43 {
  44   char dummy;
  45 };
  46
  47 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  48 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  49
  50 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  51 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  52
  53 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  54    nonzero if the definition of the type has already started.  */
  55 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  56
  57 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  58    declarations whose type would be completed by completing that type.  */
  59 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  60
  61 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  62    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  63    and C_RID_YYCODE is the token number wanted by Yacc.  */
  64 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  65
  66 struct lang_type GTY(())
  67 {
  68   /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  69   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
  70   /* In an ENUMERAL_TYPE, the min and max values.  */
  71   tree enum_min;
  72   tree enum_max;
  73   /* In a RECORD_TYPE, information specific to Objective-C, such
  74      as a list of adopted protocols or a pointer to a corresponding
  75      @interface.  See objc/objc-act.h for details.  */
  76   tree objc_info;
  77 };
  78
  79 /* Record whether a type or decl was written with nonconstant size.
  80    Note that TYPE_SIZE may have simplified to a constant.  */
  81 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  82 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  83
  84 /* Record whether a typedef for type `int' was actually `signed int'.  */
  85 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  86
  87 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  88    return type.  */
  89 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  90
  91 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  92 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  93
  94 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  95    been declared.  */
  96 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  97   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  98
  99 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
 100    built-in prototype and does not have a non-built-in prototype.  */
 101 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
 102   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
 103
 104 /* Record whether a decl was declared register.  This is strictly a
 105    front-end flag, whereas DECL_REGISTER is used for code generation;
 106    they may differ for structures with volatile fields.  */
 107 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
 108
 109 /* Record whether a decl was used in an expression anywhere except an
 110    unevaluated operand of sizeof / typeof / alignof.  This is only
 111    used for functions declared static but not defined, though outside
 112    sizeof and typeof it is set for other function decls as well.  */
 113 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
 114
 115 /* Record whether a label was defined in a statement expression which
 116    has finished and so can no longer be jumped to.  */
 117 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP)        \
 118   DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
 119
 120 /* Record whether a label was the subject of a goto from outside the
 121    current level of statement expression nesting and so cannot be
 122    defined right now.  */
 123 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP)       \
 124   DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
 125
 126 /* Record whether a label was defined in the scope of an identifier
 127    with variably modified type which has finished and so can no longer
 128    be jumped to.  */
 129 #define C_DECL_UNJUMPABLE_VM(EXP)       \
 130   DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP))
 131
 132 /* Record whether a label was the subject of a goto from outside the
 133    current level of scopes of identifiers with variably modified type
 134    and so cannot be defined right now.  */
 135 #define C_DECL_UNDEFINABLE_VM(EXP)      \
 136   DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP))
 137
 138 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 139    N.B. Could be simplified if all built-in decls had complete prototypes
 140    (but this is presently difficult because some of them need FILE*).  */
 141 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 142        (EXP == 0                                        \
 143         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 144             && !DECL_BUILT_IN (EXP)))
 145
 146 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 147    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 148    without prototypes.  */
 149 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 150
 151 /* Record parser information about an expression that is irrelevant
 152    for code generation alongside a tree representing its value.  */
 153 struct c_expr
 154 {
 155   /* The value of the expression.  */
 156   tree value;
 157   /* Record the original binary operator of an expression, which may
 158      have been changed by fold, STRING_CST for unparenthesized string
 159      constants, or ERROR_MARK for other expressions (including
 160      parenthesized expressions).  */
 161   enum tree_code original_code;
 162 };
 163
 164 /* A kind of type specifier.  Note that this information is currently
 165    only used to distinguish tag definitions, tag references and typeof
 166    uses.  */
 167 enum c_typespec_kind {
 168   /* A reserved keyword type specifier.  */
 169   ctsk_resword,
 170   /* A reference to a tag, previously declared, such as "struct foo".
 171      This includes where the previous declaration was as a different
 172      kind of tag, in which case this is only valid if shadowing that
 173      tag in an inner scope.  */
 174   ctsk_tagref,
 175   /* A reference to a tag, not previously declared in a visible
 176      scope.  */
 177   ctsk_tagfirstref,
 178   /* A definition of a tag such as "struct foo { int a; }".  */
 179   ctsk_tagdef,
 180   /* A typedef name.  */
 181   ctsk_typedef,
 182   /* An ObjC-specific kind of type specifier.  */
 183   ctsk_objc,
 184   /* A typeof specifier.  */
 185   ctsk_typeof
 186 };
 187
 188 /* A type specifier: this structure is created in the parser and
 189    passed to declspecs_add_type only.  */
 190 struct c_typespec {
 191   /* What kind of type specifier this is.  */
 192   enum c_typespec_kind kind;
 193   /* The specifier itself.  */
 194   tree spec;
 195 };
 196
 197 /* A storage class specifier.  */
 198 enum c_storage_class {
 199   csc_none,
 200   csc_auto,
 201   csc_extern,
 202   csc_register,
 203   csc_static,
 204   csc_typedef
 205 };
 206
 207 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 208    "double", 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_double
 217 };
 218
 219 /* A sequence of declaration specifiers in C.  */
 220 struct c_declspecs {
 221   /* The type specified, if a single type specifier such as a struct,
 222      union or enum specifier, typedef name or typeof specifies the
 223      whole type, or NULL_TREE if none or a keyword such as "void" or
 224      "char" is used.  Does not include qualifiers.  */
 225   tree type;
 226   /* The attributes from a typedef decl.  */
 227   tree decl_attr;
 228   /* When parsing, the attributes.  Outside the parser, this will be
 229      NULL; attributes (possibly from multiple lists) will be passed
 230      separately.  */
 231   tree attrs;
 232   /* Any type specifier keyword used such as "int", not reflecting
 233      modifiers such as "short", or cts_none if none.  */
 234   enum c_typespec_keyword typespec_word;
 235   /* The storage class specifier, or csc_none if none.  */
 236   enum c_storage_class storage_class;
 237   /* Whether something other than a storage class specifier or
 238      attribute has been seen.  This is used to warn for the
 239      obsolescent usage of storage class specifiers other than at the
 240      start of the list.  (Doing this properly would require function
 241      specifiers to be handled separately from storage class
 242      specifiers.)  */
 243   BOOL_BITFIELD non_sc_seen_p : 1;
 244   /* Whether the type is specified by a typedef or typeof name.  */
 245   BOOL_BITFIELD typedef_p : 1;
 246   /* Whether a struct, union or enum type either had its content
 247      defined by a type specifier in the list or was the first visible
 248      declaration of its tag.  */
 249   BOOL_BITFIELD tag_defined_p : 1;
 250   /* Whether the type is explicitly "signed" or specified by a typedef
 251      whose type is explicitly "signed".  */
 252   BOOL_BITFIELD explicit_signed_p : 1;
 253   /* Whether the specifiers include a deprecated typedef.  */
 254   BOOL_BITFIELD deprecated_p : 1;
 255   /* Whether the type defaulted to "int" because there were no type
 256      specifiers.  */
 257   BOOL_BITFIELD default_int_p;
 258   /* Whether "long" was specified.  */
 259   BOOL_BITFIELD long_p : 1;
 260   /* Whether "long" was specified more than once.  */
 261   BOOL_BITFIELD long_long_p : 1;
 262   /* Whether "short" was specified.  */
 263   BOOL_BITFIELD short_p : 1;
 264   /* Whether "signed" was specified.  */
 265   BOOL_BITFIELD signed_p : 1;
 266   /* Whether "unsigned" was specified.  */
 267   BOOL_BITFIELD unsigned_p : 1;
 268   /* Whether "complex" was specified.  */
 269   BOOL_BITFIELD complex_p : 1;
 270   /* Whether "inline" was specified.  */
 271   BOOL_BITFIELD inline_p : 1;
 272   /* Whether "__thread" was specified.  */
 273   BOOL_BITFIELD thread_p : 1;
 274   /* Whether "const" was specified.  */
 275   BOOL_BITFIELD const_p : 1;
 276   /* Whether "volatile" was specified.  */
 277   BOOL_BITFIELD volatile_p : 1;
 278   /* Whether "restrict" was specified.  */
 279   BOOL_BITFIELD restrict_p : 1;
 280 };
 281
 282 /* The various kinds of declarators in C.  */
 283 enum c_declarator_kind {
 284   /* An identifier.  */
 285   cdk_id,
 286   /* A function.  */
 287   cdk_function,
 288   /* An array.  */
 289   cdk_array,
 290   /* A pointer.  */
 291   cdk_pointer,
 292   /* Parenthesized declarator with nested attributes.  */
 293   cdk_attrs
 294 };
 295
 296 /* Information about the parameters in a function declarator.  */
 297 struct c_arg_info {
 298   /* A list of parameter decls.  */
 299   tree parms;
 300   /* A list of structure, union and enum tags defined.  */
 301   tree tags;
 302   /* A list of argument types to go in the FUNCTION_TYPE.  */
 303   tree types;
 304   /* A list of non-parameter decls (notably enumeration constants)
 305      defined with the parameters.  */
 306   tree others;
 307 };
 308
 309 /* A declarator.  */
 310 struct c_declarator {
 311   /* The kind of declarator.  */
 312   enum c_declarator_kind kind;
 313   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 314   struct c_declarator *declarator;
 315   union {
 316     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 317        declarator.  */
 318     tree id;
 319     /* For functions.  */
 320     struct c_arg_info *arg_info;
 321     /* For arrays.  */
 322     struct {
 323       /* The array dimension, or NULL for [] and [*].  */
 324       tree dimen;
 325       /* The qualifiers inside [].  */
 326       int quals;
 327       /* The attributes (currently ignored) inside [].  */
 328       tree attrs;
 329       /* Whether [static] was used.  */
 330       BOOL_BITFIELD static_p : 1;
 331       /* Whether [*] was used.  */
 332       BOOL_BITFIELD vla_unspec_p : 1;
 333     } array;
 334     /* For pointers, the qualifiers on the pointer type.  */
 335     int pointer_quals;
 336     /* For attributes.  */
 337     tree attrs;
 338   } u;
 339 };
 340
 341 /* A type name.  */
 342 struct c_type_name {
 343   /* The declaration specifiers.  */
 344   struct c_declspecs *specs;
 345   /* The declarator.  */
 346   struct c_declarator *declarator;
 347 };
 348
 349 /* A parameter.  */
 350 struct c_parm {
 351   /* The declaration specifiers, minus any prefix attributes.  */
 352   struct c_declspecs *specs;
 353   /* The attributes.  */
 354   tree attrs;
 355   /* The declarator.  */
 356   struct c_declarator *declarator;
 357 };
 358
 359 /* Save and restore the variables in this file and elsewhere
 360    that keep track of the progress of compilation of the current function.
 361    Used for nested functions.  */
 362
 363 struct language_function GTY(())
 364 {
 365   struct c_language_function base;
 366   tree x_break_label;
 367   tree x_cont_label;
 368   struct c_switch * GTY((skip)) x_switch_stack;
 369   struct c_arg_info * GTY((skip)) arg_info;
 370   int returns_value;
 371   int returns_null;
 372   int returns_abnormally;
 373   int warn_about_return_type;
 374   int extern_inline;
 375 };
 376
 377 /* Save lists of labels used or defined in particular contexts.
 378    Allocated on the parser obstack.  */
 379
 380 struct c_label_list
 381 {
 382   /* The label at the head of the list.  */
 383   tree label;
 384   /* The rest of the list.  */
 385   struct c_label_list *next;
 386 };
 387
 388 /* Statement expression context.  */
 389
 390 struct c_label_context_se
 391 {
 392   /* The labels defined at this level of nesting.  */
 393   struct c_label_list *labels_def;
 394   /* The labels used at this level of nesting.  */
 395   struct c_label_list *labels_used;
 396   /* The next outermost context.  */
 397   struct c_label_context_se *next;
 398 };
 399
 400 /* Context of variably modified declarations.  */
 401
 402 struct c_label_context_vm
 403 {
 404   /* The labels defined at this level of nesting.  */
 405   struct c_label_list *labels_def;
 406   /* The labels used at this level of nesting.  */
 407   struct c_label_list *labels_used;
 408   /* The scope of this context.  Multiple contexts may be at the same
 409      numbered scope, since each variably modified declaration starts a
 410      new context.  */
 411   unsigned scope;
 412   /* The next outermost context.  */
 413   struct c_label_context_vm *next;
 414 };
 415
 416 \f
 417 /* in c-parse.in */
 418 extern void c_parse_init (void);
 419
 420 /* in c-aux-info.c */
 421 extern void gen_aux_info_record (tree, int, int, int);
 422
 423 /* in c-decl.c */
 424 extern struct obstack parser_obstack;
 425 extern tree c_break_label;
 426 extern tree c_cont_label;
 427
 428 extern int global_bindings_p (void);
 429 extern void push_scope (void);
 430 extern tree pop_scope (void);
 431 extern void insert_block (tree);
 432 extern tree pushdecl (tree);
 433 extern void c_expand_body (tree);
 434
 435 extern void c_init_decl_processing (void);
 436 extern void c_dup_lang_specific_decl (tree);
 437 extern void c_print_identifier (FILE *, tree, int);
 438 extern int quals_from_declspecs (const struct c_declspecs *);
 439 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 440                                                     bool, bool);
 441 extern tree build_enumerator (tree, tree);
 442 extern void check_for_loop_decls (void);
 443 extern void mark_forward_parm_decls (void);
 444 extern void declare_parm_level (void);
 445 extern void undeclared_variable (tree);
 446 extern tree declare_label (tree);
 447 extern tree define_label (location_t, tree);
 448 extern void finish_decl (tree, tree, tree);
 449 extern tree finish_enum (tree, tree, tree);
 450 extern void finish_function (void);
 451 extern tree finish_struct (tree, tree, tree);
 452 extern struct c_arg_info *get_parm_info (bool);
 453 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
 454 extern tree groktypename (struct c_type_name *);
 455 extern tree grokparm (const struct c_parm *);
 456 extern tree implicitly_declare (tree);
 457 extern void keep_next_level (void);
 458 extern tree lookup_name (tree);
 459 extern void pending_xref_error (void);
 460 extern void c_push_function_context (struct function *);
 461 extern void c_pop_function_context (struct function *);
 462 extern void push_parm_decl (const struct c_parm *);
 463 extern tree pushdecl_top_level (tree);
 464 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 465                                                         struct c_declarator *,
 466                                                         bool);
 467 extern tree builtin_function (const char *, tree, int, enum built_in_class,
 468                               const char *, tree);
 469 extern void shadow_tag (const struct c_declspecs *);
 470 extern void shadow_tag_warned (const struct c_declspecs *, int);
 471 extern tree start_enum (tree);
 472 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 473 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 474                         tree);
 475 extern tree start_struct (enum tree_code, tree);
 476 extern void store_parm_decls (void);
 477 extern void store_parm_decls_from (struct c_arg_info *);
 478 extern tree xref_tag (enum tree_code, tree);
 479 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 480 extern int c_expand_decl (tree);
 481 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 482                                     struct c_declarator *);
 483 extern struct c_declarator *build_attrs_declarator (tree,
 484                                                     struct c_declarator *);
 485 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 486                                                        struct c_declarator *);
 487 extern struct c_declarator *build_id_declarator (tree);
 488 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 489                                                      struct c_declarator *);
 490 extern struct c_declspecs *build_null_declspecs (void);
 491 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 492 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 493                                                struct c_typespec);
 494 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 495 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 496 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 497
 498 /* in c-objc-common.c */
 499 extern int c_disregard_inline_limits (tree);
 500 extern int c_cannot_inline_tree_fn (tree *);
 501 extern bool c_objc_common_init (void);
 502 extern bool c_missing_noreturn_ok_p (tree);
 503 extern tree c_objc_common_truthvalue_conversion (tree expr);
 504 extern bool c_warn_unused_global_decl (tree);
 505 extern void c_initialize_diagnostics (diagnostic_context *);
 506
 507 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 508   c_build_qualified_type ((TYPE),                                 \
 509                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 510                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 511
 512 /* in c-typeck.c */
 513 extern int in_alignof;
 514 extern int in_sizeof;
 515 extern int in_typeof;
 516
 517 extern struct c_switch *c_switch_stack;
 518 extern struct c_label_context_se *label_context_stack_se;
 519 extern struct c_label_context_vm *label_context_stack_vm;
 520
 521 extern tree require_complete_type (tree);
 522 extern int same_translation_unit_p (tree, tree);
 523 extern int comptypes (tree, tree);
 524 extern bool c_mark_addressable (tree);
 525 extern void c_incomplete_type_error (tree, tree);
 526 extern tree c_type_promotes_to (tree);
 527 extern tree composite_type (tree, tree);
 528 extern tree build_component_ref (tree, tree);
 529 extern tree build_indirect_ref (tree, const char *);
 530 extern tree build_array_ref (tree, tree);
 531 extern tree build_external_ref (tree, int);
 532 extern void pop_maybe_used (bool);
 533 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 534 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 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 extern tree c_expr_to_decl (tree, bool *, bool *, bool *);
 576
 577 /* Set to 0 at beginning of a function definition, set to 1 if
 578    a return statement that specifies a return value is seen.  */
 579
 580 extern int current_function_returns_value;
 581
 582 /* Set to 0 at beginning of a function definition, set to 1 if
 583    a return statement with no argument is seen.  */
 584
 585 extern int current_function_returns_null;
 586
 587 /* Set to 0 at beginning of a function definition, set to 1 if
 588    a call to a noreturn function is seen.  */
 589
 590 extern int current_function_returns_abnormally;
 591
 592 /* Nonzero means we are reading code that came from a system header file.  */
 593
 594 extern int system_header_p;
 595
 596 /* True means global_bindings_p should return false even if the scope stack
 597    says we are in file scope.  */
 598
 599 extern bool c_override_global_bindings_to_false;
 600
 601 /* True means we've initialized exception handling.  */
 602 extern bool c_eh_initialized_p;
 603
 604 /* In c-decl.c */
 605 extern void c_finish_incomplete_decl (tree);
 606 extern void c_write_global_declarations (void);
 607
 608 /* In order for the format checking to accept the C frontend
 609    diagnostic framework extensions, you must include this file before
 610    toplev.h, not after.  */
 611 #define GCC_DIAG_STYLE __gcc_cdiag__
 612 #if GCC_VERSION >= 3005
 613 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 614 #else
 615 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 616 #endif
 617
 618 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 619 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 620
 621 #endif /* ! GCC_C_TREE_H */