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 /* Record whether a variable has been declared threadprivate by
 133    #pragma omp threadprivate.  */
 134 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
 135
 136 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 137    N.B. Could be simplified if all built-in decls had complete prototypes
 138    (but this is presently difficult because some of them need FILE*).  */
 139 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 140        (EXP == 0                                        \
 141         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 142             && !DECL_BUILT_IN (EXP)))
 143
 144 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 145    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 146    without prototypes.  */
 147 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 148
 149 /* Record parser information about an expression that is irrelevant
 150    for code generation alongside a tree representing its value.  */
 151 struct c_expr
 152 {
 153   /* The value of the expression.  */
 154   tree value;
 155   /* Record the original binary operator of an expression, which may
 156      have been changed by fold, STRING_CST for unparenthesized string
 157      constants, or ERROR_MARK for other expressions (including
 158      parenthesized expressions).  */
 159   enum tree_code original_code;
 160 };
 161
 162 /* A kind of type specifier.  Note that this information is currently
 163    only used to distinguish tag definitions, tag references and typeof
 164    uses.  */
 165 enum c_typespec_kind {
 166   /* A reserved keyword type specifier.  */
 167   ctsk_resword,
 168   /* A reference to a tag, previously declared, such as "struct foo".
 169      This includes where the previous declaration was as a different
 170      kind of tag, in which case this is only valid if shadowing that
 171      tag in an inner scope.  */
 172   ctsk_tagref,
 173   /* A reference to a tag, not previously declared in a visible
 174      scope.  */
 175   ctsk_tagfirstref,
 176   /* A definition of a tag such as "struct foo { int a; }".  */
 177   ctsk_tagdef,
 178   /* A typedef name.  */
 179   ctsk_typedef,
 180   /* An ObjC-specific kind of type specifier.  */
 181   ctsk_objc,
 182   /* A typeof specifier.  */
 183   ctsk_typeof
 184 };
 185
 186 /* A type specifier: this structure is created in the parser and
 187    passed to declspecs_add_type only.  */
 188 struct c_typespec {
 189   /* What kind of type specifier this is.  */
 190   enum c_typespec_kind kind;
 191   /* The specifier itself.  */
 192   tree spec;
 193 };
 194
 195 /* A storage class specifier.  */
 196 enum c_storage_class {
 197   csc_none,
 198   csc_auto,
 199   csc_extern,
 200   csc_register,
 201   csc_static,
 202   csc_typedef
 203 };
 204
 205 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 206    "double", or none of these.  */
 207 enum c_typespec_keyword {
 208   cts_none,
 209   cts_void,
 210   cts_bool,
 211   cts_char,
 212   cts_int,
 213   cts_float,
 214   cts_double,
 215   cts_dfloat32,
 216   cts_dfloat64,
 217   cts_dfloat128
 218 };
 219
 220 /* A sequence of declaration specifiers in C.  */
 221 struct c_declspecs {
 222   /* The type specified, if a single type specifier such as a struct,
 223      union or enum specifier, typedef name or typeof specifies the
 224      whole type, or NULL_TREE if none or a keyword such as "void" or
 225      "char" is used.  Does not include qualifiers.  */
 226   tree type;
 227   /* The attributes from a typedef decl.  */
 228   tree decl_attr;
 229   /* When parsing, the attributes.  Outside the parser, this will be
 230      NULL; attributes (possibly from multiple lists) will be passed
 231      separately.  */
 232   tree attrs;
 233   /* Any type specifier keyword used such as "int", not reflecting
 234      modifiers such as "short", or cts_none if none.  */
 235   enum c_typespec_keyword typespec_word;
 236   /* The storage class specifier, or csc_none if none.  */
 237   enum c_storage_class storage_class;
 238   /* Whether any declaration specifiers have been seen at all.  */
 239   BOOL_BITFIELD declspecs_seen_p : 1;
 240   /* Whether a type specifier has been seen.  */
 241   BOOL_BITFIELD type_seen_p : 1;
 242   /* Whether something other than a storage class specifier or
 243      attribute has been seen.  This is used to warn for the
 244      obsolescent usage of storage class specifiers other than at the
 245      start of the list.  (Doing this properly would require function
 246      specifiers to be handled separately from storage class
 247      specifiers.)  */
 248   BOOL_BITFIELD non_sc_seen_p : 1;
 249   /* Whether the type is specified by a typedef or typeof name.  */
 250   BOOL_BITFIELD typedef_p : 1;
 251   /* Whether a struct, union or enum type either had its content
 252      defined by a type specifier in the list or was the first visible
 253      declaration of its tag.  */
 254   BOOL_BITFIELD tag_defined_p : 1;
 255   /* Whether the type is explicitly "signed" or specified by a typedef
 256      whose type is explicitly "signed".  */
 257   BOOL_BITFIELD explicit_signed_p : 1;
 258   /* Whether the specifiers include a deprecated typedef.  */
 259   BOOL_BITFIELD deprecated_p : 1;
 260   /* Whether the type defaulted to "int" because there were no type
 261      specifiers.  */
 262   BOOL_BITFIELD default_int_p;
 263   /* Whether "long" was specified.  */
 264   BOOL_BITFIELD long_p : 1;
 265   /* Whether "long" was specified more than once.  */
 266   BOOL_BITFIELD long_long_p : 1;
 267   /* Whether "short" was specified.  */
 268   BOOL_BITFIELD short_p : 1;
 269   /* Whether "signed" was specified.  */
 270   BOOL_BITFIELD signed_p : 1;
 271   /* Whether "unsigned" was specified.  */
 272   BOOL_BITFIELD unsigned_p : 1;
 273   /* Whether "complex" was specified.  */
 274   BOOL_BITFIELD complex_p : 1;
 275   /* Whether "inline" was specified.  */
 276   BOOL_BITFIELD inline_p : 1;
 277   /* Whether "__thread" was specified.  */
 278   BOOL_BITFIELD thread_p : 1;
 279   /* Whether "const" was specified.  */
 280   BOOL_BITFIELD const_p : 1;
 281   /* Whether "volatile" was specified.  */
 282   BOOL_BITFIELD volatile_p : 1;
 283   /* Whether "restrict" was specified.  */
 284   BOOL_BITFIELD restrict_p : 1;
 285 };
 286
 287 /* The various kinds of declarators in C.  */
 288 enum c_declarator_kind {
 289   /* An identifier.  */
 290   cdk_id,
 291   /* A function.  */
 292   cdk_function,
 293   /* An array.  */
 294   cdk_array,
 295   /* A pointer.  */
 296   cdk_pointer,
 297   /* Parenthesized declarator with nested attributes.  */
 298   cdk_attrs
 299 };
 300
 301 /* Information about the parameters in a function declarator.  */
 302 struct c_arg_info {
 303   /* A list of parameter decls.  */
 304   tree parms;
 305   /* A list of structure, union and enum tags defined.  */
 306   tree tags;
 307   /* A list of argument types to go in the FUNCTION_TYPE.  */
 308   tree types;
 309   /* A list of non-parameter decls (notably enumeration constants)
 310      defined with the parameters.  */
 311   tree others;
 312   /* A list of VLA sizes from the parameters.  In a function
 313      definition, these are used to ensure that side-effects in sizes
 314      of arrays converted to pointers (such as a parameter int i[n++])
 315      take place; otherwise, they are ignored.  */
 316   tree pending_sizes;
 317   /* True when these arguments had [*].  */
 318   BOOL_BITFIELD had_vla_unspec : 1;
 319 };
 320
 321 /* A declarator.  */
 322 struct c_declarator {
 323   /* The kind of declarator.  */
 324   enum c_declarator_kind kind;
 325   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 326   struct c_declarator *declarator;
 327   location_t id_loc; /* Currently only set for cdk_id. */
 328   union {
 329     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 330        declarator.  */
 331     tree id;
 332     /* For functions.  */
 333     struct c_arg_info *arg_info;
 334     /* For arrays.  */
 335     struct {
 336       /* The array dimension, or NULL for [] and [*].  */
 337       tree dimen;
 338       /* The qualifiers inside [].  */
 339       int quals;
 340       /* The attributes (currently ignored) inside [].  */
 341       tree attrs;
 342       /* Whether [static] was used.  */
 343       BOOL_BITFIELD static_p : 1;
 344       /* Whether [*] was used.  */
 345       BOOL_BITFIELD vla_unspec_p : 1;
 346     } array;
 347     /* For pointers, the qualifiers on the pointer type.  */
 348     int pointer_quals;
 349     /* For attributes.  */
 350     tree attrs;
 351   } u;
 352 };
 353
 354 /* A type name.  */
 355 struct c_type_name {
 356   /* The declaration specifiers.  */
 357   struct c_declspecs *specs;
 358   /* The declarator.  */
 359   struct c_declarator *declarator;
 360 };
 361
 362 /* A parameter.  */
 363 struct c_parm {
 364   /* The declaration specifiers, minus any prefix attributes.  */
 365   struct c_declspecs *specs;
 366   /* The attributes.  */
 367   tree attrs;
 368   /* The declarator.  */
 369   struct c_declarator *declarator;
 370 };
 371
 372 /* Save and restore the variables in this file and elsewhere
 373    that keep track of the progress of compilation of the current function.
 374    Used for nested functions.  */
 375
 376 struct language_function GTY(())
 377 {
 378   struct c_language_function base;
 379   tree x_break_label;
 380   tree x_cont_label;
 381   struct c_switch * GTY((skip)) x_switch_stack;
 382   struct c_arg_info * GTY((skip)) arg_info;
 383   int returns_value;
 384   int returns_null;
 385   int returns_abnormally;
 386   int warn_about_return_type;
 387 };
 388
 389 /* Save lists of labels used or defined in particular contexts.
 390    Allocated on the parser obstack.  */
 391
 392 struct c_label_list
 393 {
 394   /* The label at the head of the list.  */
 395   tree label;
 396   /* The rest of the list.  */
 397   struct c_label_list *next;
 398 };
 399
 400 /* Statement expression context.  */
 401
 402 struct c_label_context_se
 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 next outermost context.  */
 409   struct c_label_context_se *next;
 410 };
 411
 412 /* Context of variably modified declarations.  */
 413
 414 struct c_label_context_vm
 415 {
 416   /* The labels defined at this level of nesting.  */
 417   struct c_label_list *labels_def;
 418   /* The labels used at this level of nesting.  */
 419   struct c_label_list *labels_used;
 420   /* The scope of this context.  Multiple contexts may be at the same
 421      numbered scope, since each variably modified declaration starts a
 422      new context.  */
 423   unsigned scope;
 424   /* The next outermost context.  */
 425   struct c_label_context_vm *next;
 426 };
 427
 428 \f
 429 /* in c-parser.c */
 430 extern void c_parse_init (void);
 431
 432 /* in c-aux-info.c */
 433 extern void gen_aux_info_record (tree, int, int, int);
 434
 435 /* in c-decl.c */
 436 extern struct obstack parser_obstack;
 437 extern tree c_break_label;
 438 extern tree c_cont_label;
 439
 440 extern int global_bindings_p (void);
 441 extern void push_scope (void);
 442 extern tree pop_scope (void);
 443 extern void insert_block (tree);
 444
 445 extern void c_init_decl_processing (void);
 446 extern void c_dup_lang_specific_decl (tree);
 447 extern void c_print_identifier (FILE *, tree, int);
 448 extern int quals_from_declspecs (const struct c_declspecs *);
 449 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 450                                                     bool, bool);
 451 extern tree build_enumerator (tree, tree);
 452 extern tree check_for_loop_decls (void);
 453 extern void mark_forward_parm_decls (void);
 454 extern void declare_parm_level (void);
 455 extern void undeclared_variable (tree, location_t);
 456 extern tree declare_label (tree);
 457 extern tree define_label (location_t, tree);
 458 extern void c_maybe_initialize_eh (void);
 459 extern void finish_decl (tree, tree, tree);
 460 extern tree finish_enum (tree, tree, tree);
 461 extern void finish_function (void);
 462 extern tree finish_struct (tree, tree, tree);
 463 extern struct c_arg_info *get_parm_info (bool);
 464 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
 465 extern tree groktypename (struct c_type_name *);
 466 extern tree grokparm (const struct c_parm *);
 467 extern tree implicitly_declare (tree);
 468 extern void keep_next_level (void);
 469 extern void pending_xref_error (void);
 470 extern void c_push_function_context (struct function *);
 471 extern void c_pop_function_context (struct function *);
 472 extern void push_parm_decl (const struct c_parm *);
 473 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 474                                                         struct c_declarator *,
 475                                                         bool);
 476 extern tree c_builtin_function (tree);
 477 extern void shadow_tag (const struct c_declspecs *);
 478 extern void shadow_tag_warned (const struct c_declspecs *, int);
 479 extern tree start_enum (tree);
 480 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 481 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 482                         tree);
 483 extern tree start_struct (enum tree_code, tree);
 484 extern void store_parm_decls (void);
 485 extern void store_parm_decls_from (struct c_arg_info *);
 486 extern tree xref_tag (enum tree_code, tree);
 487 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 488 extern int c_expand_decl (tree);
 489 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 490                                     struct c_declarator *);
 491 extern struct c_declarator *build_attrs_declarator (tree,
 492                                                     struct c_declarator *);
 493 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 494                                                        struct c_declarator *);
 495 extern struct c_declarator *build_id_declarator (tree);
 496 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 497                                                      struct c_declarator *);
 498 extern struct c_declspecs *build_null_declspecs (void);
 499 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 500 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 501                                                struct c_typespec);
 502 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 503 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 504 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 505
 506 /* in c-objc-common.c */
 507 extern int c_disregard_inline_limits (tree);
 508 extern int c_cannot_inline_tree_fn (tree *);
 509 extern bool c_objc_common_init (void);
 510 extern bool c_missing_noreturn_ok_p (tree);
 511 extern tree c_objc_common_truthvalue_conversion (tree expr);
 512 extern bool c_warn_unused_global_decl (tree);
 513 extern void c_initialize_diagnostics (diagnostic_context *);
 514 extern bool c_vla_unspec_p (tree x, tree fn);
 515
 516 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 517   c_build_qualified_type ((TYPE),                                 \
 518                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 519                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 520
 521 /* in c-typeck.c */
 522 extern int in_alignof;
 523 extern int in_sizeof;
 524 extern int in_typeof;
 525
 526 extern struct c_switch *c_switch_stack;
 527 extern struct c_label_context_se *label_context_stack_se;
 528 extern struct c_label_context_vm *label_context_stack_vm;
 529
 530 extern tree require_complete_type (tree);
 531 extern int same_translation_unit_p (tree, tree);
 532 extern int comptypes (tree, tree);
 533 extern bool c_vla_type_p (tree);
 534 extern bool c_mark_addressable (tree);
 535 extern void c_incomplete_type_error (tree, tree);
 536 extern tree c_type_promotes_to (tree);
 537 extern struct c_expr default_function_array_conversion (struct c_expr);
 538 extern tree composite_type (tree, tree);
 539 extern tree build_component_ref (tree, tree);
 540 extern tree build_array_ref (tree, tree);
 541 extern tree build_external_ref (tree, int, location_t);
 542 extern void pop_maybe_used (bool);
 543 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 544 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 545 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr);
 546 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
 547                                              struct c_expr);
 548 extern tree build_conditional_expr (tree, tree, tree);
 549 extern tree build_compound_expr (tree, tree);
 550 extern tree c_cast_expr (struct c_type_name *, tree);
 551 extern tree build_c_cast (tree, tree);
 552 extern void store_init_value (tree, tree);
 553 extern void error_init (const char *);
 554 extern void pedwarn_init (const char *);
 555 extern void maybe_warn_string_init (tree, struct c_expr);
 556 extern void start_init (tree, tree, int);
 557 extern void finish_init (void);
 558 extern void really_start_incremental_init (tree);
 559 extern void push_init_level (int);
 560 extern struct c_expr pop_init_level (int);
 561 extern void set_init_index (tree, tree);
 562 extern void set_init_label (tree);
 563 extern void process_init_element (struct c_expr);
 564 extern tree build_compound_literal (tree, tree);
 565 extern tree c_start_case (tree);
 566 extern void c_finish_case (tree);
 567 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 568 extern tree build_asm_stmt (tree, tree);
 569 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 570 extern int c_types_compatible_p (tree, tree);
 571 extern tree c_begin_compound_stmt (bool);
 572 extern tree c_end_compound_stmt (tree, bool);
 573 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 574 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 575 extern tree c_begin_stmt_expr (void);
 576 extern tree c_finish_stmt_expr (tree);
 577 extern tree c_process_expr_stmt (tree);
 578 extern tree c_finish_expr_stmt (tree);
 579 extern tree c_finish_return (tree);
 580 extern tree c_finish_bc_stmt (tree *, bool);
 581 extern tree c_finish_goto_label (tree);
 582 extern tree c_finish_goto_ptr (tree);
 583 extern void c_begin_vm_scope (unsigned int);
 584 extern void c_end_vm_scope (unsigned int);
 585 extern tree c_expr_to_decl (tree, bool *, bool *, bool *);
 586 extern tree c_begin_omp_parallel (void);
 587 extern tree c_finish_omp_parallel (tree, tree);
 588 extern tree c_finish_omp_clauses (tree);
 589
 590 /* Set to 0 at beginning of a function definition, set to 1 if
 591    a return statement that specifies a return value is seen.  */
 592
 593 extern int current_function_returns_value;
 594
 595 /* Set to 0 at beginning of a function definition, set to 1 if
 596    a return statement with no argument is seen.  */
 597
 598 extern int current_function_returns_null;
 599
 600 /* Set to 0 at beginning of a function definition, set to 1 if
 601    a call to a noreturn function is seen.  */
 602
 603 extern int current_function_returns_abnormally;
 604
 605 /* Nonzero means we are reading code that came from a system header file.  */
 606
 607 extern int system_header_p;
 608
 609 /* True means global_bindings_p should return false even if the scope stack
 610    says we are in file scope.  */
 611
 612 extern bool c_override_global_bindings_to_false;
 613
 614 /* True means we've initialized exception handling.  */
 615 extern bool c_eh_initialized_p;
 616
 617 /* In c-decl.c */
 618 extern void c_finish_incomplete_decl (tree);
 619 extern void c_write_global_declarations (void);
 620
 621 /* In order for the format checking to accept the C frontend
 622    diagnostic framework extensions, you must include this file before
 623    toplev.h, not after.  */
 624 #if GCC_VERSION >= 4001
 625 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 626 #else
 627 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 628 #endif
 629
 630 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 631 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 632
 633 #endif /* ! GCC_C_TREE_H */