gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001,
   3    2002, 2003, 2004, 2005, 2007  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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_C_TREE_H
  22 #define GCC_C_TREE_H
  23
  24 #include "c-common.h"
  25 #include "toplev.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 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  93    built-in prototype and does not have a non-built-in prototype.  */
  94 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  95   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  96
  97 /* Record whether a decl was declared register.  This is strictly a
  98    front-end flag, whereas DECL_REGISTER is used for code generation;
  99    they may differ for structures with volatile fields.  */
 100 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
 101
 102 /* Record whether a decl was used in an expression anywhere except an
 103    unevaluated operand of sizeof / typeof / alignof.  This is only
 104    used for functions declared static but not defined, though outside
 105    sizeof and typeof it is set for other function decls as well.  */
 106 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
 107
 108 /* Record whether a label was defined in a statement expression which
 109    has finished and so can no longer be jumped to.  */
 110 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP)        \
 111   DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
 112
 113 /* Record whether a label was the subject of a goto from outside the
 114    current level of statement expression nesting and so cannot be
 115    defined right now.  */
 116 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP)       \
 117   DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
 118
 119 /* Record whether a label was defined in the scope of an identifier
 120    with variably modified type which has finished and so can no longer
 121    be jumped to.  */
 122 #define C_DECL_UNJUMPABLE_VM(EXP)       \
 123   DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP))
 124
 125 /* Record whether a label was the subject of a goto from outside the
 126    current level of scopes of identifiers with variably modified type
 127    and so cannot be defined right now.  */
 128 #define C_DECL_UNDEFINABLE_VM(EXP)      \
 129   DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP))
 130
 131 /* Record whether a variable has been declared threadprivate by
 132    #pragma omp threadprivate.  */
 133 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
 134
 135 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 136    N.B. Could be simplified if all built-in decls had complete prototypes
 137    (but this is presently difficult because some of them need FILE*).  */
 138 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 139        (EXP == 0                                        \
 140         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 141             && !DECL_BUILT_IN (EXP)))
 142
 143 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 144    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 145    without prototypes.  */
 146 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 147
 148 /* Record parser information about an expression that is irrelevant
 149    for code generation alongside a tree representing its value.  */
 150 struct c_expr
 151 {
 152   /* The value of the expression.  */
 153   tree value;
 154   /* Record the original binary operator of an expression, which may
 155      have been changed by fold, STRING_CST for unparenthesized string
 156      constants, or ERROR_MARK for other expressions (including
 157      parenthesized expressions).  */
 158   enum tree_code original_code;
 159 };
 160
 161 /* A kind of type specifier.  Note that this information is currently
 162    only used to distinguish tag definitions, tag references and typeof
 163    uses.  */
 164 enum c_typespec_kind {
 165   /* A reserved keyword type specifier.  */
 166   ctsk_resword,
 167   /* A reference to a tag, previously declared, such as "struct foo".
 168      This includes where the previous declaration was as a different
 169      kind of tag, in which case this is only valid if shadowing that
 170      tag in an inner scope.  */
 171   ctsk_tagref,
 172   /* A reference to a tag, not previously declared in a visible
 173      scope.  */
 174   ctsk_tagfirstref,
 175   /* A definition of a tag such as "struct foo { int a; }".  */
 176   ctsk_tagdef,
 177   /* A typedef name.  */
 178   ctsk_typedef,
 179   /* An ObjC-specific kind of type specifier.  */
 180   ctsk_objc,
 181   /* A typeof specifier.  */
 182   ctsk_typeof
 183 };
 184
 185 /* A type specifier: this structure is created in the parser and
 186    passed to declspecs_add_type only.  */
 187 struct c_typespec {
 188   /* What kind of type specifier this is.  */
 189   enum c_typespec_kind kind;
 190   /* The specifier itself.  */
 191   tree spec;
 192 };
 193
 194 /* A storage class specifier.  */
 195 enum c_storage_class {
 196   csc_none,
 197   csc_auto,
 198   csc_extern,
 199   csc_register,
 200   csc_static,
 201   csc_typedef
 202 };
 203
 204 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 205    "double", or none of these.  */
 206 enum c_typespec_keyword {
 207   cts_none,
 208   cts_void,
 209   cts_bool,
 210   cts_char,
 211   cts_int,
 212   cts_float,
 213   cts_double,
 214   cts_dfloat32,
 215   cts_dfloat64,
 216   cts_dfloat128
 217 };
 218
 219 /* A sequence of declaration specifiers in C.  */
 220 struct c_declspecs {
 221   /* The type specified, if a single type specifier such as a struct,
 222      union or enum specifier, typedef name or typeof specifies the
 223      whole type, or NULL_TREE if none or a keyword such as "void" or
 224      "char" is used.  Does not include qualifiers.  */
 225   tree type;
 226   /* The attributes from a typedef decl.  */
 227   tree decl_attr;
 228   /* When parsing, the attributes.  Outside the parser, this will be
 229      NULL; attributes (possibly from multiple lists) will be passed
 230      separately.  */
 231   tree attrs;
 232   /* Any type specifier keyword used such as "int", not reflecting
 233      modifiers such as "short", or cts_none if none.  */
 234   enum c_typespec_keyword typespec_word;
 235   /* The storage class specifier, or csc_none if none.  */
 236   enum c_storage_class storage_class;
 237   /* Whether any declaration specifiers have been seen at all.  */
 238   BOOL_BITFIELD declspecs_seen_p : 1;
 239   /* Whether a type specifier has been seen.  */
 240   BOOL_BITFIELD type_seen_p : 1;
 241   /* Whether something other than a storage class specifier or
 242      attribute has been seen.  This is used to warn for the
 243      obsolescent usage of storage class specifiers other than at the
 244      start of the list.  (Doing this properly would require function
 245      specifiers to be handled separately from storage class
 246      specifiers.)  */
 247   BOOL_BITFIELD non_sc_seen_p : 1;
 248   /* Whether the type is specified by a typedef or typeof name.  */
 249   BOOL_BITFIELD typedef_p : 1;
 250   /* Whether a struct, union or enum type either had its content
 251      defined by a type specifier in the list or was the first visible
 252      declaration of its tag.  */
 253   BOOL_BITFIELD tag_defined_p : 1;
 254   /* Whether the type is explicitly "signed" or specified by a typedef
 255      whose type is explicitly "signed".  */
 256   BOOL_BITFIELD explicit_signed_p : 1;
 257   /* Whether the specifiers include a deprecated typedef.  */
 258   BOOL_BITFIELD deprecated_p : 1;
 259   /* Whether the type defaulted to "int" because there were no type
 260      specifiers.  */
 261   BOOL_BITFIELD default_int_p;
 262   /* Whether "long" was specified.  */
 263   BOOL_BITFIELD long_p : 1;
 264   /* Whether "long" was specified more than once.  */
 265   BOOL_BITFIELD long_long_p : 1;
 266   /* Whether "short" was specified.  */
 267   BOOL_BITFIELD short_p : 1;
 268   /* Whether "signed" was specified.  */
 269   BOOL_BITFIELD signed_p : 1;
 270   /* Whether "unsigned" was specified.  */
 271   BOOL_BITFIELD unsigned_p : 1;
 272   /* Whether "complex" was specified.  */
 273   BOOL_BITFIELD complex_p : 1;
 274   /* Whether "inline" was specified.  */
 275   BOOL_BITFIELD inline_p : 1;
 276   /* Whether "__thread" was specified.  */
 277   BOOL_BITFIELD thread_p : 1;
 278   /* Whether "const" was specified.  */
 279   BOOL_BITFIELD const_p : 1;
 280   /* Whether "volatile" was specified.  */
 281   BOOL_BITFIELD volatile_p : 1;
 282   /* Whether "restrict" was specified.  */
 283   BOOL_BITFIELD restrict_p : 1;
 284 };
 285
 286 /* The various kinds of declarators in C.  */
 287 enum c_declarator_kind {
 288   /* An identifier.  */
 289   cdk_id,
 290   /* A function.  */
 291   cdk_function,
 292   /* An array.  */
 293   cdk_array,
 294   /* A pointer.  */
 295   cdk_pointer,
 296   /* Parenthesized declarator with nested attributes.  */
 297   cdk_attrs
 298 };
 299
 300 /* Information about the parameters in a function declarator.  */
 301 struct c_arg_info {
 302   /* A list of parameter decls.  */
 303   tree parms;
 304   /* A list of structure, union and enum tags defined.  */
 305   tree tags;
 306   /* A list of argument types to go in the FUNCTION_TYPE.  */
 307   tree types;
 308   /* A list of non-parameter decls (notably enumeration constants)
 309      defined with the parameters.  */
 310   tree others;
 311   /* A list of VLA sizes from the parameters.  In a function
 312      definition, these are used to ensure that side-effects in sizes
 313      of arrays converted to pointers (such as a parameter int i[n++])
 314      take place; otherwise, they are ignored.  */
 315   tree pending_sizes;
 316   /* True when these arguments had [*].  */
 317   BOOL_BITFIELD had_vla_unspec : 1;
 318 };
 319
 320 /* A declarator.  */
 321 struct c_declarator {
 322   /* The kind of declarator.  */
 323   enum c_declarator_kind kind;
 324   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 325   struct c_declarator *declarator;
 326   location_t id_loc; /* Currently only set for cdk_id. */
 327   union {
 328     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 329        declarator.  */
 330     tree id;
 331     /* For functions.  */
 332     struct c_arg_info *arg_info;
 333     /* For arrays.  */
 334     struct {
 335       /* The array dimension, or NULL for [] and [*].  */
 336       tree dimen;
 337       /* The qualifiers inside [].  */
 338       int quals;
 339       /* The attributes (currently ignored) inside [].  */
 340       tree attrs;
 341       /* Whether [static] was used.  */
 342       BOOL_BITFIELD static_p : 1;
 343       /* Whether [*] was used.  */
 344       BOOL_BITFIELD vla_unspec_p : 1;
 345     } array;
 346     /* For pointers, the qualifiers on the pointer type.  */
 347     int pointer_quals;
 348     /* For attributes.  */
 349     tree attrs;
 350   } u;
 351 };
 352
 353 /* A type name.  */
 354 struct c_type_name {
 355   /* The declaration specifiers.  */
 356   struct c_declspecs *specs;
 357   /* The declarator.  */
 358   struct c_declarator *declarator;
 359 };
 360
 361 /* A parameter.  */
 362 struct c_parm {
 363   /* The declaration specifiers, minus any prefix attributes.  */
 364   struct c_declspecs *specs;
 365   /* The attributes.  */
 366   tree attrs;
 367   /* The declarator.  */
 368   struct c_declarator *declarator;
 369 };
 370
 371 /* Save and restore the variables in this file and elsewhere
 372    that keep track of the progress of compilation of the current function.
 373    Used for nested functions.  */
 374
 375 struct language_function GTY(())
 376 {
 377   struct c_language_function base;
 378   tree x_break_label;
 379   tree x_cont_label;
 380   struct c_switch * GTY((skip)) x_switch_stack;
 381   struct c_arg_info * GTY((skip)) arg_info;
 382   int returns_value;
 383   int returns_null;
 384   int returns_abnormally;
 385   int warn_about_return_type;
 386   int extern_inline;
 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 extern void c_expand_body (tree);
 445
 446 extern void c_init_decl_processing (void);
 447 extern void c_dup_lang_specific_decl (tree);
 448 extern void c_print_identifier (FILE *, tree, int);
 449 extern int quals_from_declspecs (const struct c_declspecs *);
 450 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 451                                                     bool, bool);
 452 extern tree build_enumerator (tree, tree);
 453 extern tree check_for_loop_decls (void);
 454 extern void mark_forward_parm_decls (void);
 455 extern void declare_parm_level (void);
 456 extern void undeclared_variable (tree, location_t);
 457 extern tree declare_label (tree);
 458 extern tree define_label (location_t, tree);
 459 extern void c_maybe_initialize_eh (void);
 460 extern void finish_decl (tree, tree, tree);
 461 extern tree finish_enum (tree, tree, tree);
 462 extern void finish_function (void);
 463 extern tree finish_struct (tree, tree, tree);
 464 extern struct c_arg_info *get_parm_info (bool);
 465 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
 466 extern tree groktypename (struct c_type_name *);
 467 extern tree grokparm (const struct c_parm *);
 468 extern tree implicitly_declare (tree);
 469 extern void keep_next_level (void);
 470 extern void pending_xref_error (void);
 471 extern void c_push_function_context (struct function *);
 472 extern void c_pop_function_context (struct function *);
 473 extern void push_parm_decl (const struct c_parm *);
 474 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 475                                                         struct c_declarator *,
 476                                                         bool);
 477 extern tree builtin_function (const char *, tree, int, enum built_in_class,
 478                               const char *, tree);
 479 extern void shadow_tag (const struct c_declspecs *);
 480 extern void shadow_tag_warned (const struct c_declspecs *, int);
 481 extern tree start_enum (tree);
 482 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 483 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 484                         tree);
 485 extern tree start_struct (enum tree_code, tree);
 486 extern void store_parm_decls (void);
 487 extern void store_parm_decls_from (struct c_arg_info *);
 488 extern tree xref_tag (enum tree_code, tree);
 489 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 490 extern int c_expand_decl (tree);
 491 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 492                                     struct c_declarator *);
 493 extern struct c_declarator *build_attrs_declarator (tree,
 494                                                     struct c_declarator *);
 495 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 496                                                        struct c_declarator *);
 497 extern struct c_declarator *build_id_declarator (tree);
 498 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 499                                                      struct c_declarator *);
 500 extern struct c_declspecs *build_null_declspecs (void);
 501 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 502 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 503                                                struct c_typespec);
 504 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 505 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 506 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 507
 508 /* in c-objc-common.c */
 509 extern int c_disregard_inline_limits (tree);
 510 extern int c_cannot_inline_tree_fn (tree *);
 511 extern bool c_objc_common_init (void);
 512 extern bool c_missing_noreturn_ok_p (tree);
 513 extern tree c_objc_common_truthvalue_conversion (tree expr);
 514 extern bool c_warn_unused_global_decl (tree);
 515 extern void c_initialize_diagnostics (diagnostic_context *);
 516 extern bool c_vla_unspec_p (tree x, tree fn);
 517
 518 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 519   c_build_qualified_type ((TYPE),                                 \
 520                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 521                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 522
 523 /* in c-typeck.c */
 524 extern int in_alignof;
 525 extern int in_sizeof;
 526 extern int in_typeof;
 527
 528 extern struct c_switch *c_switch_stack;
 529 extern struct c_label_context_se *label_context_stack_se;
 530 extern struct c_label_context_vm *label_context_stack_vm;
 531
 532 extern tree require_complete_type (tree);
 533 extern int same_translation_unit_p (tree, tree);
 534 extern int comptypes (tree, tree);
 535 extern bool c_vla_type_p (tree);
 536 extern bool c_mark_addressable (tree);
 537 extern void c_incomplete_type_error (tree, tree);
 538 extern tree c_type_promotes_to (tree);
 539 extern struct c_expr default_function_array_conversion (struct c_expr);
 540 extern tree composite_type (tree, tree);
 541 extern tree build_component_ref (tree, tree);
 542 extern tree build_array_ref (tree, tree);
 543 extern tree build_external_ref (tree, int, location_t);
 544 extern void pop_maybe_used (bool);
 545 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 546 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 547 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr);
 548 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
 549                                              struct c_expr);
 550 extern tree build_conditional_expr (tree, tree, tree);
 551 extern tree build_compound_expr (tree, tree);
 552 extern tree c_cast_expr (struct c_type_name *, tree);
 553 extern tree build_c_cast (tree, tree);
 554 extern void store_init_value (tree, tree);
 555 extern void error_init (const char *);
 556 extern void pedwarn_init (const char *);
 557 extern void maybe_warn_string_init (tree, struct c_expr);
 558 extern void start_init (tree, tree, int);
 559 extern void finish_init (void);
 560 extern void really_start_incremental_init (tree);
 561 extern void push_init_level (int);
 562 extern struct c_expr pop_init_level (int);
 563 extern void set_init_index (tree, tree);
 564 extern void set_init_label (tree);
 565 extern void process_init_element (struct c_expr);
 566 extern tree build_compound_literal (tree, tree);
 567 extern tree c_start_case (tree);
 568 extern void c_finish_case (tree);
 569 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 570 extern tree build_asm_stmt (tree, tree);
 571 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 572 extern int c_types_compatible_p (tree, tree);
 573 extern tree c_begin_compound_stmt (bool);
 574 extern tree c_end_compound_stmt (tree, bool);
 575 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 576 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 577 extern tree c_begin_stmt_expr (void);
 578 extern tree c_finish_stmt_expr (tree);
 579 extern tree c_process_expr_stmt (tree);
 580 extern tree c_finish_expr_stmt (tree);
 581 extern tree c_finish_return (tree);
 582 extern tree c_finish_bc_stmt (tree *, bool);
 583 extern tree c_finish_goto_label (tree);
 584 extern tree c_finish_goto_ptr (tree);
 585 extern void c_begin_vm_scope (unsigned int);
 586 extern void c_end_vm_scope (unsigned int);
 587 extern tree c_expr_to_decl (tree, bool *, bool *, bool *);
 588 extern tree c_begin_omp_parallel (void);
 589 extern tree c_finish_omp_parallel (tree, tree);
 590 extern tree c_finish_omp_clauses (tree);
 591
 592 /* Set to 0 at beginning of a function definition, set to 1 if
 593    a return statement that specifies a return value is seen.  */
 594
 595 extern int current_function_returns_value;
 596
 597 /* Set to 0 at beginning of a function definition, set to 1 if
 598    a return statement with no argument is seen.  */
 599
 600 extern int current_function_returns_null;
 601
 602 /* Set to 0 at beginning of a function definition, set to 1 if
 603    a call to a noreturn function is seen.  */
 604
 605 extern int current_function_returns_abnormally;
 606
 607 /* Nonzero means we are reading code that came from a system header file.  */
 608
 609 extern int system_header_p;
 610
 611 /* True means global_bindings_p should return false even if the scope stack
 612    says we are in file scope.  */
 613
 614 extern bool c_override_global_bindings_to_false;
 615
 616 /* True means we've initialized exception handling.  */
 617 extern bool c_eh_initialized_p;
 618
 619 /* In c-decl.c */
 620 extern void c_finish_incomplete_decl (tree);
 621 extern void c_write_global_declarations (void);
 622
 623 /* In order for the format checking to accept the C frontend
 624    diagnostic framework extensions, you must include this file before
 625    toplev.h, not after.  */
 626 #if GCC_VERSION >= 4001
 627 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 628 #else
 629 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 630 #endif
 631
 632 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 633 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 634
 635 #endif /* ! GCC_C_TREE_H */