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, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, USA.  */
  21
  22 #ifndef GCC_C_TREE_H
  23 #define GCC_C_TREE_H
  24
  25 #include "c-common.h"
  26 #include "toplev.h"
  27 #include "diagnostic.h"
  28
  29 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  30    know how big it is.  This is sanity-checked in c-decl.c.  */
  31 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  32   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  33
  34 /* Language-specific declaration information.  */
  35
  36 struct lang_decl GTY(())
  37 {
  38   char dummy;
  39 };
  40
  41 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  42 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  43
  44 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  45 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  46
  47 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  48    nonzero if the definition of the type has already started.  */
  49 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  50
  51 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  52    declarations whose type would be completed by completing that type.  */
  53 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  54
  55 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  56    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  57    and C_RID_YYCODE is the token number wanted by Yacc.  */
  58 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  59
  60 struct lang_type GTY(())
  61 {
  62   /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  63   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
  64   /* In an ENUMERAL_TYPE, the min and max values.  */
  65   tree enum_min;
  66   tree enum_max;
  67   /* In a RECORD_TYPE, information specific to Objective-C, such
  68      as a list of adopted protocols or a pointer to a corresponding
  69      @interface.  See objc/objc-act.h for details.  */
  70   tree objc_info;
  71 };
  72
  73 /* Record whether a type or decl was written with nonconstant size.
  74    Note that TYPE_SIZE may have simplified to a constant.  */
  75 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  76 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  77
  78 /* Record whether a typedef for type `int' was actually `signed int'.  */
  79 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  80
  81 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  82    return type.  */
  83 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  84
  85 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  86 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  87
  88 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  89    been declared.  */
  90 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  91   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  92
  93 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  94    built-in prototype and does not have a non-built-in prototype.  */
  95 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  96   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  97
  98 /* Record whether a decl was declared register.  This is strictly a
  99    front-end flag, whereas DECL_REGISTER is used for code generation;
 100    they may differ for structures with volatile fields.  */
 101 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
 102
 103 /* Record whether a decl was used in an expression anywhere except an
 104    unevaluated operand of sizeof / typeof / alignof.  This is only
 105    used for functions declared static but not defined, though outside
 106    sizeof and typeof it is set for other function decls as well.  */
 107 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
 108
 109 /* Record whether a label was defined in a statement expression which
 110    has finished and so can no longer be jumped to.  */
 111 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP)        \
 112   DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
 113
 114 /* Record whether a label was the subject of a goto from outside the
 115    current level of statement expression nesting and so cannot be
 116    defined right now.  */
 117 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP)       \
 118   DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
 119
 120 /* Record whether a label was defined in the scope of an identifier
 121    with variably modified type which has finished and so can no longer
 122    be jumped to.  */
 123 #define C_DECL_UNJUMPABLE_VM(EXP)       \
 124   DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP))
 125
 126 /* Record whether a label was the subject of a goto from outside the
 127    current level of scopes of identifiers with variably modified type
 128    and so cannot be defined right now.  */
 129 #define C_DECL_UNDEFINABLE_VM(EXP)      \
 130   DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP))
 131
 132 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 133    N.B. Could be simplified if all built-in decls had complete prototypes
 134    (but this is presently difficult because some of them need FILE*).  */
 135 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 136        (EXP == 0                                        \
 137         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 138             && !DECL_BUILT_IN (EXP)))
 139
 140 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 141    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 142    without prototypes.  */
 143 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 144
 145 /* Record parser information about an expression that is irrelevant
 146    for code generation alongside a tree representing its value.  */
 147 struct c_expr
 148 {
 149   /* The value of the expression.  */
 150   tree value;
 151   /* Record the original binary operator of an expression, which may
 152      have been changed by fold, STRING_CST for unparenthesized string
 153      constants, or ERROR_MARK for other expressions (including
 154      parenthesized expressions).  */
 155   enum tree_code original_code;
 156 };
 157
 158 /* A kind of type specifier.  Note that this information is currently
 159    only used to distinguish tag definitions, tag references and typeof
 160    uses.  */
 161 enum c_typespec_kind {
 162   /* A reserved keyword type specifier.  */
 163   ctsk_resword,
 164   /* A reference to a tag, previously declared, such as "struct foo".
 165      This includes where the previous declaration was as a different
 166      kind of tag, in which case this is only valid if shadowing that
 167      tag in an inner scope.  */
 168   ctsk_tagref,
 169   /* A reference to a tag, not previously declared in a visible
 170      scope.  */
 171   ctsk_tagfirstref,
 172   /* A definition of a tag such as "struct foo { int a; }".  */
 173   ctsk_tagdef,
 174   /* A typedef name.  */
 175   ctsk_typedef,
 176   /* An ObjC-specific kind of type specifier.  */
 177   ctsk_objc,
 178   /* A typeof specifier.  */
 179   ctsk_typeof
 180 };
 181
 182 /* A type specifier: this structure is created in the parser and
 183    passed to declspecs_add_type only.  */
 184 struct c_typespec {
 185   /* What kind of type specifier this is.  */
 186   enum c_typespec_kind kind;
 187   /* The specifier itself.  */
 188   tree spec;
 189 };
 190
 191 /* A storage class specifier.  */
 192 enum c_storage_class {
 193   csc_none,
 194   csc_auto,
 195   csc_extern,
 196   csc_register,
 197   csc_static,
 198   csc_typedef
 199 };
 200
 201 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 202    "double", or none of these.  */
 203 enum c_typespec_keyword {
 204   cts_none,
 205   cts_void,
 206   cts_bool,
 207   cts_char,
 208   cts_int,
 209   cts_float,
 210   cts_double,
 211   cts_dfloat32,
 212   cts_dfloat64,
 213   cts_dfloat128
 214 };
 215
 216 /* A sequence of declaration specifiers in C.  */
 217 struct c_declspecs {
 218   /* The type specified, if a single type specifier such as a struct,
 219      union or enum specifier, typedef name or typeof specifies the
 220      whole type, or NULL_TREE if none or a keyword such as "void" or
 221      "char" is used.  Does not include qualifiers.  */
 222   tree type;
 223   /* The attributes from a typedef decl.  */
 224   tree decl_attr;
 225   /* When parsing, the attributes.  Outside the parser, this will be
 226      NULL; attributes (possibly from multiple lists) will be passed
 227      separately.  */
 228   tree attrs;
 229   /* Any type specifier keyword used such as "int", not reflecting
 230      modifiers such as "short", or cts_none if none.  */
 231   enum c_typespec_keyword typespec_word;
 232   /* The storage class specifier, or csc_none if none.  */
 233   enum c_storage_class storage_class;
 234   /* Whether any declaration specifiers have been seen at all.  */
 235   BOOL_BITFIELD declspecs_seen_p : 1;
 236   /* Whether a type specifier has been seen.  */
 237   BOOL_BITFIELD type_seen_p : 1;
 238   /* Whether something other than a storage class specifier or
 239      attribute has been seen.  This is used to warn for the
 240      obsolescent usage of storage class specifiers other than at the
 241      start of the list.  (Doing this properly would require function
 242      specifiers to be handled separately from storage class
 243      specifiers.)  */
 244   BOOL_BITFIELD non_sc_seen_p : 1;
 245   /* Whether the type is specified by a typedef or typeof name.  */
 246   BOOL_BITFIELD typedef_p : 1;
 247   /* Whether a struct, union or enum type either had its content
 248      defined by a type specifier in the list or was the first visible
 249      declaration of its tag.  */
 250   BOOL_BITFIELD tag_defined_p : 1;
 251   /* Whether the type is explicitly "signed" or specified by a typedef
 252      whose type is explicitly "signed".  */
 253   BOOL_BITFIELD explicit_signed_p : 1;
 254   /* Whether the specifiers include a deprecated typedef.  */
 255   BOOL_BITFIELD deprecated_p : 1;
 256   /* Whether the type defaulted to "int" because there were no type
 257      specifiers.  */
 258   BOOL_BITFIELD default_int_p;
 259   /* Whether "long" was specified.  */
 260   BOOL_BITFIELD long_p : 1;
 261   /* Whether "long" was specified more than once.  */
 262   BOOL_BITFIELD long_long_p : 1;
 263   /* Whether "short" was specified.  */
 264   BOOL_BITFIELD short_p : 1;
 265   /* Whether "signed" was specified.  */
 266   BOOL_BITFIELD signed_p : 1;
 267   /* Whether "unsigned" was specified.  */
 268   BOOL_BITFIELD unsigned_p : 1;
 269   /* Whether "complex" was specified.  */
 270   BOOL_BITFIELD complex_p : 1;
 271   /* Whether "inline" was specified.  */
 272   BOOL_BITFIELD inline_p : 1;
 273   /* Whether "__thread" was specified.  */
 274   BOOL_BITFIELD thread_p : 1;
 275   /* Whether "const" was specified.  */
 276   BOOL_BITFIELD const_p : 1;
 277   /* Whether "volatile" was specified.  */
 278   BOOL_BITFIELD volatile_p : 1;
 279   /* Whether "restrict" was specified.  */
 280   BOOL_BITFIELD restrict_p : 1;
 281 };
 282
 283 /* The various kinds of declarators in C.  */
 284 enum c_declarator_kind {
 285   /* An identifier.  */
 286   cdk_id,
 287   /* A function.  */
 288   cdk_function,
 289   /* An array.  */
 290   cdk_array,
 291   /* A pointer.  */
 292   cdk_pointer,
 293   /* Parenthesized declarator with nested attributes.  */
 294   cdk_attrs
 295 };
 296
 297 /* Information about the parameters in a function declarator.  */
 298 struct c_arg_info {
 299   /* A list of parameter decls.  */
 300   tree parms;
 301   /* A list of structure, union and enum tags defined.  */
 302   tree tags;
 303   /* A list of argument types to go in the FUNCTION_TYPE.  */
 304   tree types;
 305   /* A list of non-parameter decls (notably enumeration constants)
 306      defined with the parameters.  */
 307   tree others;
 308 };
 309
 310 /* A declarator.  */
 311 struct c_declarator {
 312   /* The kind of declarator.  */
 313   enum c_declarator_kind kind;
 314   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 315   struct c_declarator *declarator;
 316   location_t id_loc; /* Currently only set for cdk_id. */
 317   union {
 318     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 319        declarator.  */
 320     tree id;
 321     /* For functions.  */
 322     struct c_arg_info *arg_info;
 323     /* For arrays.  */
 324     struct {
 325       /* The array dimension, or NULL for [] and [*].  */
 326       tree dimen;
 327       /* The qualifiers inside [].  */
 328       int quals;
 329       /* The attributes (currently ignored) inside [].  */
 330       tree attrs;
 331       /* Whether [static] was used.  */
 332       BOOL_BITFIELD static_p : 1;
 333       /* Whether [*] was used.  */
 334       BOOL_BITFIELD vla_unspec_p : 1;
 335     } array;
 336     /* For pointers, the qualifiers on the pointer type.  */
 337     int pointer_quals;
 338     /* For attributes.  */
 339     tree attrs;
 340   } u;
 341 };
 342
 343 /* A type name.  */
 344 struct c_type_name {
 345   /* The declaration specifiers.  */
 346   struct c_declspecs *specs;
 347   /* The declarator.  */
 348   struct c_declarator *declarator;
 349 };
 350
 351 /* A parameter.  */
 352 struct c_parm {
 353   /* The declaration specifiers, minus any prefix attributes.  */
 354   struct c_declspecs *specs;
 355   /* The attributes.  */
 356   tree attrs;
 357   /* The declarator.  */
 358   struct c_declarator *declarator;
 359 };
 360
 361 /* Save and restore the variables in this file and elsewhere
 362    that keep track of the progress of compilation of the current function.
 363    Used for nested functions.  */
 364
 365 struct language_function GTY(())
 366 {
 367   struct c_language_function base;
 368   tree x_break_label;
 369   tree x_cont_label;
 370   struct c_switch * GTY((skip)) x_switch_stack;
 371   struct c_arg_info * GTY((skip)) arg_info;
 372   int returns_value;
 373   int returns_null;
 374   int returns_abnormally;
 375   int warn_about_return_type;
 376   int extern_inline;
 377 };
 378
 379 /* Save lists of labels used or defined in particular contexts.
 380    Allocated on the parser obstack.  */
 381
 382 struct c_label_list
 383 {
 384   /* The label at the head of the list.  */
 385   tree label;
 386   /* The rest of the list.  */
 387   struct c_label_list *next;
 388 };
 389
 390 /* Statement expression context.  */
 391
 392 struct c_label_context_se
 393 {
 394   /* The labels defined at this level of nesting.  */
 395   struct c_label_list *labels_def;
 396   /* The labels used at this level of nesting.  */
 397   struct c_label_list *labels_used;
 398   /* The next outermost context.  */
 399   struct c_label_context_se *next;
 400 };
 401
 402 /* Context of variably modified declarations.  */
 403
 404 struct c_label_context_vm
 405 {
 406   /* The labels defined at this level of nesting.  */
 407   struct c_label_list *labels_def;
 408   /* The labels used at this level of nesting.  */
 409   struct c_label_list *labels_used;
 410   /* The scope of this context.  Multiple contexts may be at the same
 411      numbered scope, since each variably modified declaration starts a
 412      new context.  */
 413   unsigned scope;
 414   /* The next outermost context.  */
 415   struct c_label_context_vm *next;
 416 };
 417
 418 \f
 419 /* in c-parser.c */
 420 extern void c_parse_init (void);
 421
 422 /* in c-aux-info.c */
 423 extern void gen_aux_info_record (tree, int, int, int);
 424
 425 /* in c-decl.c */
 426 extern struct obstack parser_obstack;
 427 extern tree c_break_label;
 428 extern tree c_cont_label;
 429
 430 extern int global_bindings_p (void);
 431 extern void push_scope (void);
 432 extern tree pop_scope (void);
 433 extern void insert_block (tree);
 434 extern tree pushdecl (tree);
 435 extern void c_expand_body (tree);
 436
 437 extern void c_init_decl_processing (void);
 438 extern void c_dup_lang_specific_decl (tree);
 439 extern void c_print_identifier (FILE *, tree, int);
 440 extern int quals_from_declspecs (const struct c_declspecs *);
 441 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 442                                                     bool, bool);
 443 extern tree build_enumerator (tree, tree);
 444 extern void check_for_loop_decls (void);
 445 extern void mark_forward_parm_decls (void);
 446 extern void declare_parm_level (void);
 447 extern void undeclared_variable (tree, location_t);
 448 extern tree declare_label (tree);
 449 extern tree define_label (location_t, tree);
 450 extern void finish_decl (tree, tree, tree);
 451 extern tree finish_enum (tree, tree, tree);
 452 extern void finish_function (void);
 453 extern tree finish_struct (tree, tree, tree);
 454 extern struct c_arg_info *get_parm_info (bool);
 455 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
 456 extern tree groktypename (struct c_type_name *);
 457 extern tree grokparm (const struct c_parm *);
 458 extern tree implicitly_declare (tree);
 459 extern void keep_next_level (void);
 460 extern void pending_xref_error (void);
 461 extern void c_push_function_context (struct function *);
 462 extern void c_pop_function_context (struct function *);
 463 extern void push_parm_decl (const struct c_parm *);
 464 extern tree pushdecl_top_level (tree);
 465 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 466                                                         struct c_declarator *,
 467                                                         bool);
 468 extern tree builtin_function (const char *, tree, int, enum built_in_class,
 469                               const char *, tree);
 470 extern void shadow_tag (const struct c_declspecs *);
 471 extern void shadow_tag_warned (const struct c_declspecs *, int);
 472 extern tree start_enum (tree);
 473 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 474 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 475                         tree);
 476 extern tree start_struct (enum tree_code, tree);
 477 extern void store_parm_decls (void);
 478 extern void store_parm_decls_from (struct c_arg_info *);
 479 extern tree xref_tag (enum tree_code, tree);
 480 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 481 extern int c_expand_decl (tree);
 482 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 483                                     struct c_declarator *);
 484 extern struct c_declarator *build_attrs_declarator (tree,
 485                                                     struct c_declarator *);
 486 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 487                                                        struct c_declarator *);
 488 extern struct c_declarator *build_id_declarator (tree);
 489 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 490                                                      struct c_declarator *);
 491 extern struct c_declspecs *build_null_declspecs (void);
 492 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 493 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 494                                                struct c_typespec);
 495 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 496 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 497 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 498
 499 /* in c-objc-common.c */
 500 extern int c_disregard_inline_limits (tree);
 501 extern int c_cannot_inline_tree_fn (tree *);
 502 extern bool c_objc_common_init (void);
 503 extern bool c_missing_noreturn_ok_p (tree);
 504 extern tree c_objc_common_truthvalue_conversion (tree expr);
 505 extern bool c_warn_unused_global_decl (tree);
 506 extern void c_initialize_diagnostics (diagnostic_context *);
 507
 508 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 509   c_build_qualified_type ((TYPE),                                 \
 510                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 511                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 512
 513 /* in c-typeck.c */
 514 extern int in_alignof;
 515 extern int in_sizeof;
 516 extern int in_typeof;
 517
 518 extern struct c_switch *c_switch_stack;
 519 extern struct c_label_context_se *label_context_stack_se;
 520 extern struct c_label_context_vm *label_context_stack_vm;
 521
 522 extern tree require_complete_type (tree);
 523 extern int same_translation_unit_p (tree, tree);
 524 extern int comptypes (tree, tree);
 525 extern bool c_mark_addressable (tree);
 526 extern void c_incomplete_type_error (tree, tree);
 527 extern tree c_type_promotes_to (tree);
 528 extern tree default_conversion (tree);
 529 extern struct c_expr default_function_array_conversion (struct c_expr);
 530 extern tree composite_type (tree, tree);
 531 extern tree build_component_ref (tree, tree);
 532 extern tree build_indirect_ref (tree, const char *);
 533 extern tree build_array_ref (tree, tree);
 534 extern tree build_external_ref (tree, int, location_t);
 535 extern void pop_maybe_used (bool);
 536 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 537 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 538 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr);
 539 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
 540                                              struct c_expr);
 541 extern tree build_conditional_expr (tree, tree, tree);
 542 extern tree build_compound_expr (tree, tree);
 543 extern tree c_cast_expr (struct c_type_name *, tree);
 544 extern tree build_c_cast (tree, tree);
 545 extern tree build_modify_expr (tree, enum tree_code, tree);
 546 extern void store_init_value (tree, tree);
 547 extern void error_init (const char *);
 548 extern void pedwarn_init (const char *);
 549 extern void maybe_warn_string_init (tree, struct c_expr);
 550 extern void start_init (tree, tree, int);
 551 extern void finish_init (void);
 552 extern void really_start_incremental_init (tree);
 553 extern void push_init_level (int);
 554 extern struct c_expr pop_init_level (int);
 555 extern void set_init_index (tree, tree);
 556 extern void set_init_label (tree);
 557 extern void process_init_element (struct c_expr);
 558 extern tree build_compound_literal (tree, tree);
 559 extern tree c_start_case (tree);
 560 extern void c_finish_case (tree);
 561 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 562 extern tree build_asm_stmt (tree, tree);
 563 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 564 extern int c_types_compatible_p (tree, tree);
 565 extern tree c_begin_compound_stmt (bool);
 566 extern tree c_end_compound_stmt (tree, bool);
 567 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 568 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 569 extern tree c_begin_stmt_expr (void);
 570 extern tree c_finish_stmt_expr (tree);
 571 extern tree c_process_expr_stmt (tree);
 572 extern tree c_finish_expr_stmt (tree);
 573 extern tree c_finish_return (tree);
 574 extern tree c_finish_bc_stmt (tree *, bool);
 575 extern tree c_finish_goto_label (tree);
 576 extern tree c_finish_goto_ptr (tree);
 577 extern void c_begin_vm_scope (unsigned int);
 578 extern void c_end_vm_scope (unsigned int);
 579 extern tree c_expr_to_decl (tree, bool *, bool *, bool *);
 580
 581 /* Set to 0 at beginning of a function definition, set to 1 if
 582    a return statement that specifies a return value is seen.  */
 583
 584 extern int current_function_returns_value;
 585
 586 /* Set to 0 at beginning of a function definition, set to 1 if
 587    a return statement with no argument is seen.  */
 588
 589 extern int current_function_returns_null;
 590
 591 /* Set to 0 at beginning of a function definition, set to 1 if
 592    a call to a noreturn function is seen.  */
 593
 594 extern int current_function_returns_abnormally;
 595
 596 /* Nonzero means we are reading code that came from a system header file.  */
 597
 598 extern int system_header_p;
 599
 600 /* True means global_bindings_p should return false even if the scope stack
 601    says we are in file scope.  */
 602
 603 extern bool c_override_global_bindings_to_false;
 604
 605 /* True means we've initialized exception handling.  */
 606 extern bool c_eh_initialized_p;
 607
 608 /* In c-decl.c */
 609 extern void c_finish_incomplete_decl (tree);
 610 extern void c_write_global_declarations (void);
 611
 612 /* In order for the format checking to accept the C frontend
 613    diagnostic framework extensions, you must include this file before
 614    toplev.h, not after.  */
 615 #if GCC_VERSION >= 4001
 616 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 617 #else
 618 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 619 #endif
 620
 621 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 622 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 623
 624 #endif /* ! GCC_C_TREE_H */