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 /* Record whether a decl was declared register.  This is strictly a
  93    front-end flag, whereas DECL_REGISTER is used for code generation;
  94    they may differ for structures with volatile fields.  */
  95 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  96
  97 /* Record whether a decl was used in an expression anywhere except an
  98    unevaluated operand of sizeof / typeof / alignof.  This is only
  99    used for functions declared static but not defined, though outside
 100    sizeof and typeof it is set for other function decls as well.  */
 101 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
 102
 103 /* Record whether a label was defined in a statement expression which
 104    has finished and so can no longer be jumped to.  */
 105 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP)        \
 106   DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
 107
 108 /* Record whether a label was the subject of a goto from outside the
 109    current level of statement expression nesting and so cannot be
 110    defined right now.  */
 111 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP)       \
 112   DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
 113
 114 /* Record whether a label was defined in the scope of an identifier
 115    with variably modified type which has finished and so can no longer
 116    be jumped to.  */
 117 #define C_DECL_UNJUMPABLE_VM(EXP)       \
 118   DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP))
 119
 120 /* Record whether a label was the subject of a goto from outside the
 121    current level of scopes of identifiers with variably modified type
 122    and so cannot be defined right now.  */
 123 #define C_DECL_UNDEFINABLE_VM(EXP)      \
 124   DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP))
 125
 126 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 127    N.B. Could be simplified if all built-in decls had complete prototypes
 128    (but this is presently difficult because some of them need FILE*).  */
 129 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 130        (EXP == 0                                        \
 131         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 132             && !DECL_BUILT_IN (EXP)))
 133
 134 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 135    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 136    without prototypes.  */
 137 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 138
 139 /* Record parser information about an expression that is irrelevant
 140    for code generation alongside a tree representing its value.  */
 141 struct c_expr
 142 {
 143   /* The value of the expression.  */
 144   tree value;
 145   /* Record the original binary operator of an expression, which may
 146      have been changed by fold, STRING_CST for unparenthesized string
 147      constants, or ERROR_MARK for other expressions (including
 148      parenthesized expressions).  */
 149   enum tree_code original_code;
 150 };
 151
 152 /* A kind of type specifier.  Note that this information is currently
 153    only used to distinguish tag definitions, tag references and typeof
 154    uses.  */
 155 enum c_typespec_kind {
 156   /* A reserved keyword type specifier.  */
 157   ctsk_resword,
 158   /* A reference to a tag, previously declared, such as "struct foo".
 159      This includes where the previous declaration was as a different
 160      kind of tag, in which case this is only valid if shadowing that
 161      tag in an inner scope.  */
 162   ctsk_tagref,
 163   /* A reference to a tag, not previously declared in a visible
 164      scope.  */
 165   ctsk_tagfirstref,
 166   /* A definition of a tag such as "struct foo { int a; }".  */
 167   ctsk_tagdef,
 168   /* A typedef name.  */
 169   ctsk_typedef,
 170   /* An ObjC-specific kind of type specifier.  */
 171   ctsk_objc,
 172   /* A typeof specifier.  */
 173   ctsk_typeof
 174 };
 175
 176 /* A type specifier: this structure is created in the parser and
 177    passed to declspecs_add_type only.  */
 178 struct c_typespec {
 179   /* What kind of type specifier this is.  */
 180   enum c_typespec_kind kind;
 181   /* The specifier itself.  */
 182   tree spec;
 183 };
 184
 185 /* A storage class specifier.  */
 186 enum c_storage_class {
 187   csc_none,
 188   csc_auto,
 189   csc_extern,
 190   csc_register,
 191   csc_static,
 192   csc_typedef
 193 };
 194
 195 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 196    "double", or none of these.  */
 197 enum c_typespec_keyword {
 198   cts_none,
 199   cts_void,
 200   cts_bool,
 201   cts_char,
 202   cts_int,
 203   cts_float,
 204   cts_double
 205 };
 206
 207 /* A sequence of declaration specifiers in C.  */
 208 struct c_declspecs {
 209   /* The type specified, if a single type specifier such as a struct,
 210      union or enum specifier, typedef name or typeof specifies the
 211      whole type, or NULL_TREE if none or a keyword such as "void" or
 212      "char" is used.  Does not include qualifiers.  */
 213   tree type;
 214   /* The attributes from a typedef decl.  */
 215   tree decl_attr;
 216   /* When parsing, the attributes.  Outside the parser, this will be
 217      NULL; attributes (possibly from multiple lists) will be passed
 218      separately.  */
 219   tree attrs;
 220   /* Any type specifier keyword used such as "int", not reflecting
 221      modifiers such as "short", or cts_none if none.  */
 222   enum c_typespec_keyword typespec_word;
 223   /* The storage class specifier, or csc_none if none.  */
 224   enum c_storage_class storage_class;
 225   /* Whether any declaration specifiers have been seen at all.  */
 226   BOOL_BITFIELD declspecs_seen_p : 1;
 227   /* Whether a type specifier has been seen.  */
 228   BOOL_BITFIELD type_seen_p : 1;
 229   /* Whether something other than a storage class specifier or
 230      attribute has been seen.  This is used to warn for the
 231      obsolescent usage of storage class specifiers other than at the
 232      start of the list.  (Doing this properly would require function
 233      specifiers to be handled separately from storage class
 234      specifiers.)  */
 235   BOOL_BITFIELD non_sc_seen_p : 1;
 236   /* Whether the type is specified by a typedef or typeof name.  */
 237   BOOL_BITFIELD typedef_p : 1;
 238   /* Whether a struct, union or enum type either had its content
 239      defined by a type specifier in the list or was the first visible
 240      declaration of its tag.  */
 241   BOOL_BITFIELD tag_defined_p : 1;
 242   /* Whether the type is explicitly "signed" or specified by a typedef
 243      whose type is explicitly "signed".  */
 244   BOOL_BITFIELD explicit_signed_p : 1;
 245   /* Whether the specifiers include a deprecated typedef.  */
 246   BOOL_BITFIELD deprecated_p : 1;
 247   /* Whether the type defaulted to "int" because there were no type
 248      specifiers.  */
 249   BOOL_BITFIELD default_int_p;
 250   /* Whether "long" was specified.  */
 251   BOOL_BITFIELD long_p : 1;
 252   /* Whether "long" was specified more than once.  */
 253   BOOL_BITFIELD long_long_p : 1;
 254   /* Whether "short" was specified.  */
 255   BOOL_BITFIELD short_p : 1;
 256   /* Whether "signed" was specified.  */
 257   BOOL_BITFIELD signed_p : 1;
 258   /* Whether "unsigned" was specified.  */
 259   BOOL_BITFIELD unsigned_p : 1;
 260   /* Whether "complex" was specified.  */
 261   BOOL_BITFIELD complex_p : 1;
 262   /* Whether "inline" was specified.  */
 263   BOOL_BITFIELD inline_p : 1;
 264   /* Whether "__thread" was specified.  */
 265   BOOL_BITFIELD thread_p : 1;
 266   /* Whether "const" was specified.  */
 267   BOOL_BITFIELD const_p : 1;
 268   /* Whether "volatile" was specified.  */
 269   BOOL_BITFIELD volatile_p : 1;
 270   /* Whether "restrict" was specified.  */
 271   BOOL_BITFIELD restrict_p : 1;
 272 };
 273
 274 /* The various kinds of declarators in C.  */
 275 enum c_declarator_kind {
 276   /* An identifier.  */
 277   cdk_id,
 278   /* A function.  */
 279   cdk_function,
 280   /* An array.  */
 281   cdk_array,
 282   /* A pointer.  */
 283   cdk_pointer,
 284   /* Parenthesized declarator with nested attributes.  */
 285   cdk_attrs
 286 };
 287
 288 /* Information about the parameters in a function declarator.  */
 289 struct c_arg_info {
 290   /* A list of parameter decls.  */
 291   tree parms;
 292   /* A list of structure, union and enum tags defined.  */
 293   tree tags;
 294   /* A list of argument types to go in the FUNCTION_TYPE.  */
 295   tree types;
 296   /* A list of non-parameter decls (notably enumeration constants)
 297      defined with the parameters.  */
 298   tree others;
 299 };
 300
 301 /* A declarator.  */
 302 struct c_declarator {
 303   /* The kind of declarator.  */
 304   enum c_declarator_kind kind;
 305   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 306   struct c_declarator *declarator;
 307   location_t id_loc; /* Currently only set for cdk_id. */
 308   union {
 309     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 310        declarator.  */
 311     tree id;
 312     /* For functions.  */
 313     struct c_arg_info *arg_info;
 314     /* For arrays.  */
 315     struct {
 316       /* The array dimension, or NULL for [] and [*].  */
 317       tree dimen;
 318       /* The qualifiers inside [].  */
 319       int quals;
 320       /* The attributes (currently ignored) inside [].  */
 321       tree attrs;
 322       /* Whether [static] was used.  */
 323       BOOL_BITFIELD static_p : 1;
 324       /* Whether [*] was used.  */
 325       BOOL_BITFIELD vla_unspec_p : 1;
 326     } array;
 327     /* For pointers, the qualifiers on the pointer type.  */
 328     int pointer_quals;
 329     /* For attributes.  */
 330     tree attrs;
 331   } u;
 332 };
 333
 334 /* A type name.  */
 335 struct c_type_name {
 336   /* The declaration specifiers.  */
 337   struct c_declspecs *specs;
 338   /* The declarator.  */
 339   struct c_declarator *declarator;
 340 };
 341
 342 /* A parameter.  */
 343 struct c_parm {
 344   /* The declaration specifiers, minus any prefix attributes.  */
 345   struct c_declspecs *specs;
 346   /* The attributes.  */
 347   tree attrs;
 348   /* The declarator.  */
 349   struct c_declarator *declarator;
 350 };
 351
 352 /* Save and restore the variables in this file and elsewhere
 353    that keep track of the progress of compilation of the current function.
 354    Used for nested functions.  */
 355
 356 struct language_function GTY(())
 357 {
 358   struct c_language_function base;
 359   tree x_break_label;
 360   tree x_cont_label;
 361   struct c_switch * GTY((skip)) x_switch_stack;
 362   struct c_arg_info * GTY((skip)) arg_info;
 363   int returns_value;
 364   int returns_null;
 365   int returns_abnormally;
 366   int warn_about_return_type;
 367   int extern_inline;
 368 };
 369
 370 /* Save lists of labels used or defined in particular contexts.
 371    Allocated on the parser obstack.  */
 372
 373 struct c_label_list
 374 {
 375   /* The label at the head of the list.  */
 376   tree label;
 377   /* The rest of the list.  */
 378   struct c_label_list *next;
 379 };
 380
 381 /* Statement expression context.  */
 382
 383 struct c_label_context_se
 384 {
 385   /* The labels defined at this level of nesting.  */
 386   struct c_label_list *labels_def;
 387   /* The labels used at this level of nesting.  */
 388   struct c_label_list *labels_used;
 389   /* The next outermost context.  */
 390   struct c_label_context_se *next;
 391 };
 392
 393 /* Context of variably modified declarations.  */
 394
 395 struct c_label_context_vm
 396 {
 397   /* The labels defined at this level of nesting.  */
 398   struct c_label_list *labels_def;
 399   /* The labels used at this level of nesting.  */
 400   struct c_label_list *labels_used;
 401   /* The scope of this context.  Multiple contexts may be at the same
 402      numbered scope, since each variably modified declaration starts a
 403      new context.  */
 404   unsigned scope;
 405   /* The next outermost context.  */
 406   struct c_label_context_vm *next;
 407 };
 408
 409 \f
 410 /* in c-parser.c */
 411 extern void c_parse_init (void);
 412
 413 /* in c-aux-info.c */
 414 extern void gen_aux_info_record (tree, int, int, int);
 415
 416 /* in c-decl.c */
 417 extern struct obstack parser_obstack;
 418 extern tree c_break_label;
 419 extern tree c_cont_label;
 420
 421 extern int global_bindings_p (void);
 422 extern void push_scope (void);
 423 extern tree pop_scope (void);
 424 extern void insert_block (tree);
 425 extern tree pushdecl (tree);
 426 extern void c_expand_body (tree);
 427
 428 extern void c_init_decl_processing (void);
 429 extern void c_dup_lang_specific_decl (tree);
 430 extern void c_print_identifier (FILE *, tree, int);
 431 extern int quals_from_declspecs (const struct c_declspecs *);
 432 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 433                                                     bool, bool);
 434 extern tree build_enumerator (tree, tree);
 435 extern void check_for_loop_decls (void);
 436 extern void mark_forward_parm_decls (void);
 437 extern void declare_parm_level (void);
 438 extern void undeclared_variable (tree, location_t);
 439 extern tree declare_label (tree);
 440 extern tree define_label (location_t, tree);
 441 extern void finish_decl (tree, tree, tree);
 442 extern tree finish_enum (tree, tree, tree);
 443 extern void finish_function (void);
 444 extern tree finish_struct (tree, tree, tree);
 445 extern struct c_arg_info *get_parm_info (bool);
 446 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
 447 extern tree groktypename (struct c_type_name *);
 448 extern tree grokparm (const struct c_parm *);
 449 extern tree implicitly_declare (tree);
 450 extern void keep_next_level (void);
 451 extern tree lookup_name (tree);
 452 extern void pending_xref_error (void);
 453 extern void c_push_function_context (struct function *);
 454 extern void c_pop_function_context (struct function *);
 455 extern void push_parm_decl (const struct c_parm *);
 456 extern tree pushdecl_top_level (tree);
 457 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 458                                                         struct c_declarator *,
 459                                                         bool);
 460 extern tree builtin_function (const char *, tree, int, enum built_in_class,
 461                               const char *, tree);
 462 extern void shadow_tag (const struct c_declspecs *);
 463 extern void shadow_tag_warned (const struct c_declspecs *, int);
 464 extern tree start_enum (tree);
 465 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 466 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 467                         tree);
 468 extern tree start_struct (enum tree_code, tree);
 469 extern void store_parm_decls (void);
 470 extern void store_parm_decls_from (struct c_arg_info *);
 471 extern tree xref_tag (enum tree_code, tree);
 472 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 473 extern int c_expand_decl (tree);
 474 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 475                                     struct c_declarator *);
 476 extern struct c_declarator *build_attrs_declarator (tree,
 477                                                     struct c_declarator *);
 478 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 479                                                        struct c_declarator *);
 480 extern struct c_declarator *build_id_declarator (tree);
 481 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 482                                                      struct c_declarator *);
 483 extern struct c_declspecs *build_null_declspecs (void);
 484 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 485 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 486                                                struct c_typespec);
 487 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 488 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 489 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 490
 491 /* in c-objc-common.c */
 492 extern int c_disregard_inline_limits (tree);
 493 extern int c_cannot_inline_tree_fn (tree *);
 494 extern bool c_objc_common_init (void);
 495 extern bool c_missing_noreturn_ok_p (tree);
 496 extern tree c_objc_common_truthvalue_conversion (tree expr);
 497 extern bool c_warn_unused_global_decl (tree);
 498 extern void c_initialize_diagnostics (diagnostic_context *);
 499
 500 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 501   c_build_qualified_type ((TYPE),                                 \
 502                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 503                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 504
 505 /* in c-typeck.c */
 506 extern int in_alignof;
 507 extern int in_sizeof;
 508 extern int in_typeof;
 509
 510 extern struct c_switch *c_switch_stack;
 511 extern struct c_label_context_se *label_context_stack_se;
 512 extern struct c_label_context_vm *label_context_stack_vm;
 513
 514 extern tree require_complete_type (tree);
 515 extern int same_translation_unit_p (tree, tree);
 516 extern int comptypes (tree, tree);
 517 extern bool c_mark_addressable (tree);
 518 extern void c_incomplete_type_error (tree, tree);
 519 extern tree c_type_promotes_to (tree);
 520 extern tree default_conversion (tree);
 521 extern tree composite_type (tree, tree);
 522 extern tree build_component_ref (tree, tree);
 523 extern tree build_indirect_ref (tree, const char *);
 524 extern tree build_array_ref (tree, tree);
 525 extern tree build_external_ref (tree, int, location_t);
 526 extern void pop_maybe_used (bool);
 527 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 528 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 529 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
 530                                              struct c_expr);
 531 extern tree build_conditional_expr (tree, tree, tree);
 532 extern tree build_compound_expr (tree, tree);
 533 extern tree c_cast_expr (struct c_type_name *, tree);
 534 extern tree build_c_cast (tree, tree);
 535 extern tree build_modify_expr (tree, enum tree_code, tree);
 536 extern void store_init_value (tree, tree);
 537 extern void error_init (const char *);
 538 extern void pedwarn_init (const char *);
 539 extern void maybe_warn_string_init (tree, struct c_expr);
 540 extern void start_init (tree, tree, int);
 541 extern void finish_init (void);
 542 extern void really_start_incremental_init (tree);
 543 extern void push_init_level (int);
 544 extern struct c_expr pop_init_level (int);
 545 extern void set_init_index (tree, tree);
 546 extern void set_init_label (tree);
 547 extern void process_init_element (struct c_expr);
 548 extern tree build_compound_literal (tree, tree);
 549 extern tree c_start_case (tree);
 550 extern void c_finish_case (tree);
 551 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 552 extern tree build_asm_stmt (tree, tree);
 553 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 554 extern int c_types_compatible_p (tree, tree);
 555 extern tree c_begin_compound_stmt (bool);
 556 extern tree c_end_compound_stmt (tree, bool);
 557 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 558 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 559 extern tree c_begin_stmt_expr (void);
 560 extern tree c_finish_stmt_expr (tree);
 561 extern tree c_process_expr_stmt (tree);
 562 extern tree c_finish_expr_stmt (tree);
 563 extern tree c_finish_return (tree);
 564 extern tree c_finish_bc_stmt (tree *, bool);
 565 extern tree c_finish_goto_label (tree);
 566 extern tree c_finish_goto_ptr (tree);
 567 extern void c_begin_vm_scope (unsigned int);
 568 extern void c_end_vm_scope (unsigned int);
 569
 570 /* Set to 0 at beginning of a function definition, set to 1 if
 571    a return statement that specifies a return value is seen.  */
 572
 573 extern int current_function_returns_value;
 574
 575 /* Set to 0 at beginning of a function definition, set to 1 if
 576    a return statement with no argument is seen.  */
 577
 578 extern int current_function_returns_null;
 579
 580 /* Set to 0 at beginning of a function definition, set to 1 if
 581    a call to a noreturn function is seen.  */
 582
 583 extern int current_function_returns_abnormally;
 584
 585 /* Nonzero means we are reading code that came from a system header file.  */
 586
 587 extern int system_header_p;
 588
 589 /* True means global_bindings_p should return false even if the scope stack
 590    says we are in file scope.  */
 591
 592 extern bool c_override_global_bindings_to_false;
 593
 594 /* True means we've initialized exception handling.  */
 595 extern bool c_eh_initialized_p;
 596
 597 /* In c-decl.c */
 598 extern void c_finish_incomplete_decl (tree);
 599 extern void c_write_global_declarations (void);
 600
 601 /* In order for the format checking to accept the C frontend
 602    diagnostic framework extensions, you must include this file before
 603    toplev.h, not after.  */
 604 #define GCC_DIAG_STYLE __gcc_cdiag__
 605 #if GCC_VERSION >= 3005
 606 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 607 #else
 608 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 609 #endif
 610
 611 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 612 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 613
 614 #endif /* ! GCC_C_TREE_H */