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 };
 212
 213 /* A sequence of declaration specifiers in C.  */
 214 struct c_declspecs {
 215   /* The type specified, if a single type specifier such as a struct,
 216      union or enum specifier, typedef name or typeof specifies the
 217      whole type, or NULL_TREE if none or a keyword such as "void" or
 218      "char" is used.  Does not include qualifiers.  */
 219   tree type;
 220   /* The attributes from a typedef decl.  */
 221   tree decl_attr;
 222   /* When parsing, the attributes.  Outside the parser, this will be
 223      NULL; attributes (possibly from multiple lists) will be passed
 224      separately.  */
 225   tree attrs;
 226   /* Any type specifier keyword used such as "int", not reflecting
 227      modifiers such as "short", or cts_none if none.  */
 228   enum c_typespec_keyword typespec_word;
 229   /* The storage class specifier, or csc_none if none.  */
 230   enum c_storage_class storage_class;
 231   /* Whether any declaration specifiers have been seen at all.  */
 232   BOOL_BITFIELD declspecs_seen_p : 1;
 233   /* Whether a type specifier has been seen.  */
 234   BOOL_BITFIELD type_seen_p : 1;
 235   /* Whether something other than a storage class specifier or
 236      attribute has been seen.  This is used to warn for the
 237      obsolescent usage of storage class specifiers other than at the
 238      start of the list.  (Doing this properly would require function
 239      specifiers to be handled separately from storage class
 240      specifiers.)  */
 241   BOOL_BITFIELD non_sc_seen_p : 1;
 242   /* Whether the type is specified by a typedef or typeof name.  */
 243   BOOL_BITFIELD typedef_p : 1;
 244   /* Whether a struct, union or enum type either had its content
 245      defined by a type specifier in the list or was the first visible
 246      declaration of its tag.  */
 247   BOOL_BITFIELD tag_defined_p : 1;
 248   /* Whether the type is explicitly "signed" or specified by a typedef
 249      whose type is explicitly "signed".  */
 250   BOOL_BITFIELD explicit_signed_p : 1;
 251   /* Whether the specifiers include a deprecated typedef.  */
 252   BOOL_BITFIELD deprecated_p : 1;
 253   /* Whether the type defaulted to "int" because there were no type
 254      specifiers.  */
 255   BOOL_BITFIELD default_int_p;
 256   /* Whether "long" was specified.  */
 257   BOOL_BITFIELD long_p : 1;
 258   /* Whether "long" was specified more than once.  */
 259   BOOL_BITFIELD long_long_p : 1;
 260   /* Whether "short" was specified.  */
 261   BOOL_BITFIELD short_p : 1;
 262   /* Whether "signed" was specified.  */
 263   BOOL_BITFIELD signed_p : 1;
 264   /* Whether "unsigned" was specified.  */
 265   BOOL_BITFIELD unsigned_p : 1;
 266   /* Whether "complex" was specified.  */
 267   BOOL_BITFIELD complex_p : 1;
 268   /* Whether "inline" was specified.  */
 269   BOOL_BITFIELD inline_p : 1;
 270   /* Whether "__thread" was specified.  */
 271   BOOL_BITFIELD thread_p : 1;
 272   /* Whether "const" was specified.  */
 273   BOOL_BITFIELD const_p : 1;
 274   /* Whether "volatile" was specified.  */
 275   BOOL_BITFIELD volatile_p : 1;
 276   /* Whether "restrict" was specified.  */
 277   BOOL_BITFIELD restrict_p : 1;
 278 };
 279
 280 /* The various kinds of declarators in C.  */
 281 enum c_declarator_kind {
 282   /* An identifier.  */
 283   cdk_id,
 284   /* A function.  */
 285   cdk_function,
 286   /* An array.  */
 287   cdk_array,
 288   /* A pointer.  */
 289   cdk_pointer,
 290   /* Parenthesized declarator with nested attributes.  */
 291   cdk_attrs
 292 };
 293
 294 /* Information about the parameters in a function declarator.  */
 295 struct c_arg_info {
 296   /* A list of parameter decls.  */
 297   tree parms;
 298   /* A list of structure, union and enum tags defined.  */
 299   tree tags;
 300   /* A list of argument types to go in the FUNCTION_TYPE.  */
 301   tree types;
 302   /* A list of non-parameter decls (notably enumeration constants)
 303      defined with the parameters.  */
 304   tree others;
 305 };
 306
 307 /* A declarator.  */
 308 struct c_declarator {
 309   /* The kind of declarator.  */
 310   enum c_declarator_kind kind;
 311   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 312   struct c_declarator *declarator;
 313   location_t id_loc; /* Currently only set for cdk_id. */
 314   union {
 315     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 316        declarator.  */
 317     tree id;
 318     /* For functions.  */
 319     struct c_arg_info *arg_info;
 320     /* For arrays.  */
 321     struct {
 322       /* The array dimension, or NULL for [] and [*].  */
 323       tree dimen;
 324       /* The qualifiers inside [].  */
 325       int quals;
 326       /* The attributes (currently ignored) inside [].  */
 327       tree attrs;
 328       /* Whether [static] was used.  */
 329       BOOL_BITFIELD static_p : 1;
 330       /* Whether [*] was used.  */
 331       BOOL_BITFIELD vla_unspec_p : 1;
 332     } array;
 333     /* For pointers, the qualifiers on the pointer type.  */
 334     int pointer_quals;
 335     /* For attributes.  */
 336     tree attrs;
 337   } u;
 338 };
 339
 340 /* A type name.  */
 341 struct c_type_name {
 342   /* The declaration specifiers.  */
 343   struct c_declspecs *specs;
 344   /* The declarator.  */
 345   struct c_declarator *declarator;
 346 };
 347
 348 /* A parameter.  */
 349 struct c_parm {
 350   /* The declaration specifiers, minus any prefix attributes.  */
 351   struct c_declspecs *specs;
 352   /* The attributes.  */
 353   tree attrs;
 354   /* The declarator.  */
 355   struct c_declarator *declarator;
 356 };
 357
 358 /* Save and restore the variables in this file and elsewhere
 359    that keep track of the progress of compilation of the current function.
 360    Used for nested functions.  */
 361
 362 struct language_function GTY(())
 363 {
 364   struct c_language_function base;
 365   tree x_break_label;
 366   tree x_cont_label;
 367   struct c_switch * GTY((skip)) x_switch_stack;
 368   struct c_arg_info * GTY((skip)) arg_info;
 369   int returns_value;
 370   int returns_null;
 371   int returns_abnormally;
 372   int warn_about_return_type;
 373   int extern_inline;
 374 };
 375
 376 /* Save lists of labels used or defined in particular contexts.
 377    Allocated on the parser obstack.  */
 378
 379 struct c_label_list
 380 {
 381   /* The label at the head of the list.  */
 382   tree label;
 383   /* The rest of the list.  */
 384   struct c_label_list *next;
 385 };
 386
 387 /* Statement expression context.  */
 388
 389 struct c_label_context_se
 390 {
 391   /* The labels defined at this level of nesting.  */
 392   struct c_label_list *labels_def;
 393   /* The labels used at this level of nesting.  */
 394   struct c_label_list *labels_used;
 395   /* The next outermost context.  */
 396   struct c_label_context_se *next;
 397 };
 398
 399 /* Context of variably modified declarations.  */
 400
 401 struct c_label_context_vm
 402 {
 403   /* The labels defined at this level of nesting.  */
 404   struct c_label_list *labels_def;
 405   /* The labels used at this level of nesting.  */
 406   struct c_label_list *labels_used;
 407   /* The scope of this context.  Multiple contexts may be at the same
 408      numbered scope, since each variably modified declaration starts a
 409      new context.  */
 410   unsigned scope;
 411   /* The next outermost context.  */
 412   struct c_label_context_vm *next;
 413 };
 414
 415 \f
 416 /* in c-parser.c */
 417 extern void c_parse_init (void);
 418
 419 /* in c-aux-info.c */
 420 extern void gen_aux_info_record (tree, int, int, int);
 421
 422 /* in c-decl.c */
 423 extern struct obstack parser_obstack;
 424 extern tree c_break_label;
 425 extern tree c_cont_label;
 426
 427 extern int global_bindings_p (void);
 428 extern void push_scope (void);
 429 extern tree pop_scope (void);
 430 extern void insert_block (tree);
 431 extern tree pushdecl (tree);
 432 extern void c_expand_body (tree);
 433
 434 extern void c_init_decl_processing (void);
 435 extern void c_dup_lang_specific_decl (tree);
 436 extern void c_print_identifier (FILE *, tree, int);
 437 extern int quals_from_declspecs (const struct c_declspecs *);
 438 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 439                                                     bool, bool);
 440 extern tree build_enumerator (tree, tree);
 441 extern void check_for_loop_decls (void);
 442 extern void mark_forward_parm_decls (void);
 443 extern void declare_parm_level (void);
 444 extern void undeclared_variable (tree, location_t);
 445 extern tree declare_label (tree);
 446 extern tree define_label (location_t, tree);
 447 extern void finish_decl (tree, tree, tree);
 448 extern tree finish_enum (tree, tree, tree);
 449 extern void finish_function (void);
 450 extern tree finish_struct (tree, tree, tree);
 451 extern struct c_arg_info *get_parm_info (bool);
 452 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
 453 extern tree groktypename (struct c_type_name *);
 454 extern tree grokparm (const struct c_parm *);
 455 extern tree implicitly_declare (tree);
 456 extern void keep_next_level (void);
 457 extern tree lookup_name (tree);
 458 extern void pending_xref_error (void);
 459 extern void c_push_function_context (struct function *);
 460 extern void c_pop_function_context (struct function *);
 461 extern void push_parm_decl (const struct c_parm *);
 462 extern tree pushdecl_top_level (tree);
 463 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 464                                                         struct c_declarator *,
 465                                                         bool);
 466 extern tree builtin_function (const char *, tree, int, enum built_in_class,
 467                               const char *, tree);
 468 extern void shadow_tag (const struct c_declspecs *);
 469 extern void shadow_tag_warned (const struct c_declspecs *, int);
 470 extern tree start_enum (tree);
 471 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 472 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 473                         tree);
 474 extern tree start_struct (enum tree_code, tree);
 475 extern void store_parm_decls (void);
 476 extern void store_parm_decls_from (struct c_arg_info *);
 477 extern tree xref_tag (enum tree_code, tree);
 478 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 479 extern int c_expand_decl (tree);
 480 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 481                                     struct c_declarator *);
 482 extern struct c_declarator *build_attrs_declarator (tree,
 483                                                     struct c_declarator *);
 484 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 485                                                        struct c_declarator *);
 486 extern struct c_declarator *build_id_declarator (tree);
 487 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 488                                                      struct c_declarator *);
 489 extern struct c_declspecs *build_null_declspecs (void);
 490 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 491 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 492                                                struct c_typespec);
 493 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 494 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 495 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 496
 497 /* in c-objc-common.c */
 498 extern int c_disregard_inline_limits (tree);
 499 extern int c_cannot_inline_tree_fn (tree *);
 500 extern bool c_objc_common_init (void);
 501 extern bool c_missing_noreturn_ok_p (tree);
 502 extern tree c_objc_common_truthvalue_conversion (tree expr);
 503 extern bool c_warn_unused_global_decl (tree);
 504 extern void c_initialize_diagnostics (diagnostic_context *);
 505
 506 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 507   c_build_qualified_type ((TYPE),                                 \
 508                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 509                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 510
 511 /* in c-typeck.c */
 512 extern int in_alignof;
 513 extern int in_sizeof;
 514 extern int in_typeof;
 515
 516 extern struct c_switch *c_switch_stack;
 517 extern struct c_label_context_se *label_context_stack_se;
 518 extern struct c_label_context_vm *label_context_stack_vm;
 519
 520 extern tree require_complete_type (tree);
 521 extern int same_translation_unit_p (tree, tree);
 522 extern int comptypes (tree, tree);
 523 extern bool c_mark_addressable (tree);
 524 extern void c_incomplete_type_error (tree, tree);
 525 extern tree c_type_promotes_to (tree);
 526 extern tree default_conversion (tree);
 527 extern struct c_expr default_function_array_conversion (struct c_expr);
 528 extern tree composite_type (tree, tree);
 529 extern tree build_component_ref (tree, tree);
 530 extern tree build_indirect_ref (tree, const char *);
 531 extern tree build_array_ref (tree, tree);
 532 extern tree build_external_ref (tree, int, location_t);
 533 extern void pop_maybe_used (bool);
 534 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 535 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 536 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr);
 537 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
 538                                              struct c_expr);
 539 extern tree build_conditional_expr (tree, tree, tree);
 540 extern tree build_compound_expr (tree, tree);
 541 extern tree c_cast_expr (struct c_type_name *, tree);
 542 extern tree build_c_cast (tree, tree);
 543 extern tree build_modify_expr (tree, enum tree_code, tree);
 544 extern void store_init_value (tree, tree);
 545 extern void error_init (const char *);
 546 extern void pedwarn_init (const char *);
 547 extern void maybe_warn_string_init (tree, struct c_expr);
 548 extern void start_init (tree, tree, int);
 549 extern void finish_init (void);
 550 extern void really_start_incremental_init (tree);
 551 extern void push_init_level (int);
 552 extern struct c_expr pop_init_level (int);
 553 extern void set_init_index (tree, tree);
 554 extern void set_init_label (tree);
 555 extern void process_init_element (struct c_expr);
 556 extern tree build_compound_literal (tree, tree);
 557 extern tree c_start_case (tree);
 558 extern void c_finish_case (tree);
 559 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 560 extern tree build_asm_stmt (tree, tree);
 561 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 562 extern int c_types_compatible_p (tree, tree);
 563 extern tree c_begin_compound_stmt (bool);
 564 extern tree c_end_compound_stmt (tree, bool);
 565 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 566 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 567 extern tree c_begin_stmt_expr (void);
 568 extern tree c_finish_stmt_expr (tree);
 569 extern tree c_process_expr_stmt (tree);
 570 extern tree c_finish_expr_stmt (tree);
 571 extern tree c_finish_return (tree);
 572 extern tree c_finish_bc_stmt (tree *, bool);
 573 extern tree c_finish_goto_label (tree);
 574 extern tree c_finish_goto_ptr (tree);
 575 extern void c_begin_vm_scope (unsigned int);
 576 extern void c_end_vm_scope (unsigned int);
 577 extern tree c_expr_to_decl (tree, bool *, bool *, bool *);
 578
 579 /* Set to 0 at beginning of a function definition, set to 1 if
 580    a return statement that specifies a return value is seen.  */
 581
 582 extern int current_function_returns_value;
 583
 584 /* Set to 0 at beginning of a function definition, set to 1 if
 585    a return statement with no argument is seen.  */
 586
 587 extern int current_function_returns_null;
 588
 589 /* Set to 0 at beginning of a function definition, set to 1 if
 590    a call to a noreturn function is seen.  */
 591
 592 extern int current_function_returns_abnormally;
 593
 594 /* Nonzero means we are reading code that came from a system header file.  */
 595
 596 extern int system_header_p;
 597
 598 /* True means global_bindings_p should return false even if the scope stack
 599    says we are in file scope.  */
 600
 601 extern bool c_override_global_bindings_to_false;
 602
 603 /* True means we've initialized exception handling.  */
 604 extern bool c_eh_initialized_p;
 605
 606 /* In c-decl.c */
 607 extern void c_finish_incomplete_decl (tree);
 608 extern void c_write_global_declarations (void);
 609
 610 /* In order for the format checking to accept the C frontend
 611    diagnostic framework extensions, you must include this file before
 612    toplev.h, not after.  */
 613 #if GCC_VERSION >= 4001
 614 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 615 #else
 616 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 617 #endif
 618
 619 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 620 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 621
 622 #endif /* ! GCC_C_TREE_H */