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 /* For gc purposes, return the most likely link for the longest chain.  */
  34 #define C_LANG_TREE_NODE_CHAIN_NEXT(T)                          \
  35   ((union lang_tree_node *)                                     \
  36    (TREE_CODE (T) == INTEGER_TYPE ? TYPE_NEXT_VARIANT (T)       \
  37     : TREE_CODE (T) == COMPOUND_EXPR ? TREE_OPERAND (T, 1)      \
  38     : TREE_CHAIN (T)))
  39
  40 /* Language-specific declaration information.  */
  41
  42 struct lang_decl GTY(())
  43 {
  44   char dummy;
  45 };
  46
  47 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  48 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  49
  50 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  51 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  52
  53 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  54    nonzero if the definition of the type has already started.  */
  55 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  56
  57 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  58    declarations whose type would be completed by completing that type.  */
  59 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  60
  61 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  62    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  63    and C_RID_YYCODE is the token number wanted by Yacc.  */
  64 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  65
  66 struct lang_type GTY(())
  67 {
  68   /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  69   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
  70   /* In an ENUMERAL_TYPE, the min and max values.  */
  71   tree enum_min;
  72   tree enum_max;
  73   /* In a RECORD_TYPE, information specific to Objective-C, such
  74      as a list of adopted protocols or a pointer to a corresponding
  75      @interface.  See objc/objc-act.h for details.  */
  76   tree objc_info;
  77 };
  78
  79 /* Record whether a type or decl was written with nonconstant size.
  80    Note that TYPE_SIZE may have simplified to a constant.  */
  81 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  82 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  83
  84 /* Record whether a typedef for type `int' was actually `signed int'.  */
  85 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  86
  87 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  88    return type.  */
  89 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  90
  91 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  92 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  93
  94 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  95    been declared.  */
  96 #define C_DECL_DECLARED_BUILTIN(EXP) DECL_LANG_FLAG_3 (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 (EXP)
 108
 109 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 110    N.B. Could be simplified if all built-in decls had complete prototypes
 111    (but this is presently difficult because some of them need FILE*).  */
 112 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 113        (EXP == 0                                        \
 114         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 115             && !DECL_BUILT_IN (EXP)))
 116
 117 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 118    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 119    without prototypes.  */
 120 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 121
 122 /* Record parser information about an expression that is irrelevant
 123    for code generation alongside a tree representing its value.  */
 124 struct c_expr
 125 {
 126   /* The value of the expression.  */
 127   tree value;
 128   /* Record the original binary operator of an expression, which may
 129      have been changed by fold, STRING_CST for unparenthesized string
 130      constants, or ERROR_MARK for other expressions (including
 131      parenthesized expressions).  */
 132   enum tree_code original_code;
 133 };
 134
 135 /* A kind of type specifier.  Note that this information is currently
 136    only used to distinguish tag definitions, tag references and typeof
 137    uses.  */
 138 enum c_typespec_kind {
 139   /* A reserved keyword type specifier.  */
 140   ctsk_resword,
 141   /* A reference to a tag, previously declared, such as "struct foo".
 142      This includes where the previous declaration was as a different
 143      kind of tag, in which case this is only valid if shadowing that
 144      tag in an inner scope.  */
 145   ctsk_tagref,
 146   /* A reference to a tag, not previously declared in a visible
 147      scope.  */
 148   ctsk_tagfirstref,
 149   /* A definition of a tag such as "struct foo { int a; }".  */
 150   ctsk_tagdef,
 151   /* A typedef name.  */
 152   ctsk_typedef,
 153   /* An ObjC-specific kind of type specifier.  */
 154   ctsk_objc,
 155   /* A typeof specifier.  */
 156   ctsk_typeof
 157 };
 158
 159 /* A type specifier: this structure is created in the parser and
 160    passed to declspecs_add_type only.  */
 161 struct c_typespec {
 162   /* What kind of type specifier this is.  */
 163   enum c_typespec_kind kind;
 164   /* The specifier itself.  */
 165   tree spec;
 166 };
 167
 168 /* A storage class specifier.  */
 169 enum c_storage_class {
 170   csc_none,
 171   csc_auto,
 172   csc_extern,
 173   csc_register,
 174   csc_static,
 175   csc_typedef
 176 };
 177
 178 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 179    "double", or none of these.  */
 180 enum c_typespec_keyword {
 181   cts_none,
 182   cts_void,
 183   cts_bool,
 184   cts_char,
 185   cts_int,
 186   cts_float,
 187   cts_double
 188 };
 189
 190 /* A sequence of declaration specifiers in C.  */
 191 struct c_declspecs {
 192   /* The type specified, if a single type specifier such as a struct,
 193      union or enum specifier, typedef name or typeof specifies the
 194      whole type, or NULL_TREE if none or a keyword such as "void" or
 195      "char" is used.  Does not include qualifiers.  */
 196   tree type;
 197   /* The attributes from a typedef decl.  */
 198   tree decl_attr;
 199   /* When parsing, the attributes.  Outside the parser, this will be
 200      NULL; attributes (possibly from multiple lists) will be passed
 201      separately.  */
 202   tree attrs;
 203   /* Any type specifier keyword used such as "int", not reflecting
 204      modifiers such as "short", or cts_none if none.  */
 205   enum c_typespec_keyword typespec_word;
 206   /* The storage class specifier, or csc_none if none.  */
 207   enum c_storage_class storage_class;
 208   /* Whether any declaration specifiers have been seen at all.  */
 209   BOOL_BITFIELD declspecs_seen_p : 1;
 210   /* Whether a type specifier has been seen.  */
 211   BOOL_BITFIELD type_seen_p : 1;
 212   /* Whether something other than a storage class specifier or
 213      attribute has been seen.  This is used to warn for the
 214      obsolescent usage of storage class specifiers other than at the
 215      start of the list.  (Doing this properly would require function
 216      specifiers to be handled separately from storage class
 217      specifiers.)  */
 218   BOOL_BITFIELD non_sc_seen_p : 1;
 219   /* Whether the type is specified by a typedef or typeof name.  */
 220   BOOL_BITFIELD typedef_p : 1;
 221   /* Whether a struct, union or enum type either had its content
 222      defined by a type specifier in the list or was the first visible
 223      declaration of its tag.  */
 224   BOOL_BITFIELD tag_defined_p : 1;
 225   /* Whether the type is explicitly "signed" or specified by a typedef
 226      whose type is explicitly "signed".  */
 227   BOOL_BITFIELD explicit_signed_p : 1;
 228   /* Whether the specifiers include a deprecated typedef.  */
 229   BOOL_BITFIELD deprecated_p : 1;
 230   /* Whether the type defaulted to "int" because there were no type
 231      specifiers.  */
 232   BOOL_BITFIELD default_int_p;
 233   /* Whether "long" was specified.  */
 234   BOOL_BITFIELD long_p : 1;
 235   /* Whether "long" was specified more than once.  */
 236   BOOL_BITFIELD long_long_p : 1;
 237   /* Whether "short" was specified.  */
 238   BOOL_BITFIELD short_p : 1;
 239   /* Whether "signed" was specified.  */
 240   BOOL_BITFIELD signed_p : 1;
 241   /* Whether "unsigned" was specified.  */
 242   BOOL_BITFIELD unsigned_p : 1;
 243   /* Whether "complex" was specified.  */
 244   BOOL_BITFIELD complex_p : 1;
 245   /* Whether "inline" was specified.  */
 246   BOOL_BITFIELD inline_p : 1;
 247   /* Whether "__thread" was specified.  */
 248   BOOL_BITFIELD thread_p : 1;
 249   /* Whether "const" was specified.  */
 250   BOOL_BITFIELD const_p : 1;
 251   /* Whether "volatile" was specified.  */
 252   BOOL_BITFIELD volatile_p : 1;
 253   /* Whether "restrict" was specified.  */
 254   BOOL_BITFIELD restrict_p : 1;
 255 };
 256
 257 /* The various kinds of declarators in C.  */
 258 enum c_declarator_kind {
 259   /* An identifier.  */
 260   cdk_id,
 261   /* A function.  */
 262   cdk_function,
 263   /* An array.  */
 264   cdk_array,
 265   /* A pointer.  */
 266   cdk_pointer,
 267   /* Parenthesized declarator with nested attributes.  */
 268   cdk_attrs
 269 };
 270
 271 /* Information about the parameters in a function declarator.  */
 272 struct c_arg_info {
 273   /* A list of parameter decls.  */
 274   tree parms;
 275   /* A list of structure, union and enum tags defined.  */
 276   tree tags;
 277   /* A list of argument types to go in the FUNCTION_TYPE.  */
 278   tree types;
 279   /* A list of non-parameter decls (notably enumeration constants)
 280      defined with the parameters.  */
 281   tree others;
 282 };
 283
 284 /* A declarator.  */
 285 struct c_declarator {
 286   /* The kind of declarator.  */
 287   enum c_declarator_kind kind;
 288   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 289   struct c_declarator *declarator;
 290   union {
 291     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 292        declarator.  */
 293     tree id;
 294     /* For functions.  */
 295     struct c_arg_info *arg_info;
 296     /* For arrays.  */
 297     struct {
 298       /* The array dimension, or NULL for [] and [*].  */
 299       tree dimen;
 300       /* The qualifiers inside [].  */
 301       int quals;
 302       /* The attributes (currently ignored) inside [].  */
 303       tree attrs;
 304       /* Whether [static] was used.  */
 305       BOOL_BITFIELD static_p : 1;
 306       /* Whether [*] was used.  */
 307       BOOL_BITFIELD vla_unspec_p : 1;
 308     } array;
 309     /* For pointers, the qualifiers on the pointer type.  */
 310     int pointer_quals;
 311     /* For attributes.  */
 312     tree attrs;
 313   } u;
 314 };
 315
 316 /* A type name.  */
 317 struct c_type_name {
 318   /* The declaration specifiers.  */
 319   struct c_declspecs *specs;
 320   /* The declarator.  */
 321   struct c_declarator *declarator;
 322 };
 323
 324 /* A parameter.  */
 325 struct c_parm {
 326   /* The declaration specifiers, minus any prefix attributes.  */
 327   struct c_declspecs *specs;
 328   /* The attributes.  */
 329   tree attrs;
 330   /* The declarator.  */
 331   struct c_declarator *declarator;
 332 };
 333
 334 /* Save and restore the variables in this file and elsewhere
 335    that keep track of the progress of compilation of the current function.
 336    Used for nested functions.  */
 337
 338 struct language_function GTY(())
 339 {
 340   struct c_language_function base;
 341   tree x_break_label;
 342   tree x_cont_label;
 343   struct c_switch * GTY((skip)) x_switch_stack;
 344   struct c_arg_info * GTY((skip)) arg_info;
 345   int returns_value;
 346   int returns_null;
 347   int returns_abnormally;
 348   int warn_about_return_type;
 349   int extern_inline;
 350 };
 351
 352 \f
 353 /* in c-parser.c */
 354 extern void c_parse_init (void);
 355
 356 /* in c-aux-info.c */
 357 extern void gen_aux_info_record (tree, int, int, int);
 358
 359 /* in c-decl.c */
 360 extern struct obstack parser_obstack;
 361 extern tree c_break_label;
 362 extern tree c_cont_label;
 363
 364 extern int global_bindings_p (void);
 365 extern void push_scope (void);
 366 extern tree pop_scope (void);
 367 extern void insert_block (tree);
 368 extern tree pushdecl (tree);
 369 extern void c_expand_body (tree);
 370
 371 extern void c_init_decl_processing (void);
 372 extern void c_dup_lang_specific_decl (tree);
 373 extern void c_print_identifier (FILE *, tree, int);
 374 extern int quals_from_declspecs (const struct c_declspecs *);
 375 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 376                                                     bool, bool);
 377 extern tree build_enumerator (tree, tree);
 378 extern void check_for_loop_decls (void);
 379 extern void mark_forward_parm_decls (void);
 380 extern int  complete_array_type (tree, tree, int);
 381 extern void declare_parm_level (void);
 382 extern void undeclared_variable (tree);
 383 extern tree declare_label (tree);
 384 extern tree define_label (location_t, tree);
 385 extern void finish_decl (tree, tree, tree);
 386 extern tree finish_enum (tree, tree, tree);
 387 extern void finish_function (void);
 388 extern tree finish_struct (tree, tree, tree);
 389 extern struct c_arg_info *get_parm_info (bool);
 390 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
 391 extern tree groktypename (struct c_type_name *);
 392 extern tree grokparm (const struct c_parm *);
 393 extern tree implicitly_declare (tree);
 394 extern void keep_next_level (void);
 395 extern tree lookup_name (tree);
 396 extern void pending_xref_error (void);
 397 extern void c_push_function_context (struct function *);
 398 extern void c_pop_function_context (struct function *);
 399 extern void push_parm_decl (const struct c_parm *);
 400 extern tree pushdecl_top_level (tree);
 401 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 402                                                         struct c_declarator *,
 403                                                         bool);
 404 extern tree builtin_function (const char *, tree, int, enum built_in_class,
 405                               const char *, tree);
 406 extern void shadow_tag (const struct c_declspecs *);
 407 extern void shadow_tag_warned (const struct c_declspecs *, int);
 408 extern tree start_enum (tree);
 409 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 410 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 411                         tree);
 412 extern tree start_struct (enum tree_code, tree);
 413 extern void store_parm_decls (void);
 414 extern void store_parm_decls_from (struct c_arg_info *);
 415 extern tree xref_tag (enum tree_code, tree);
 416 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 417 extern int c_expand_decl (tree);
 418 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 419                                     struct c_declarator *);
 420 extern struct c_declarator *build_attrs_declarator (tree,
 421                                                     struct c_declarator *);
 422 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 423                                                        struct c_declarator *);
 424 extern struct c_declarator *build_id_declarator (tree);
 425 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 426                                                      struct c_declarator *);
 427 extern struct c_declspecs *build_null_declspecs (void);
 428 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 429 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 430                                                struct c_typespec);
 431 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 432 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 433 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 434
 435 /* in c-objc-common.c */
 436 extern int c_disregard_inline_limits (tree);
 437 extern int c_cannot_inline_tree_fn (tree *);
 438 extern bool c_objc_common_init (void);
 439 extern bool c_missing_noreturn_ok_p (tree);
 440 extern tree c_objc_common_truthvalue_conversion (tree expr);
 441 extern bool c_warn_unused_global_decl (tree);
 442 extern void c_initialize_diagnostics (diagnostic_context *);
 443
 444 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 445   c_build_qualified_type ((TYPE),                                 \
 446                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 447                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 448
 449 /* in c-typeck.c */
 450 extern int in_alignof;
 451 extern int in_sizeof;
 452 extern int in_typeof;
 453
 454 extern struct c_switch *c_switch_stack;
 455
 456 extern tree require_complete_type (tree);
 457 extern int same_translation_unit_p (tree, tree);
 458 extern int comptypes (tree, tree);
 459 extern bool c_mark_addressable (tree);
 460 extern void c_incomplete_type_error (tree, tree);
 461 extern tree c_type_promotes_to (tree);
 462 extern tree composite_type (tree, tree);
 463 extern tree build_component_ref (tree, tree);
 464 extern tree build_indirect_ref (tree, const char *);
 465 extern tree build_array_ref (tree, tree);
 466 extern tree build_external_ref (tree, int);
 467 extern void pop_maybe_used (bool);
 468 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 469 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 470 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
 471                                              struct c_expr);
 472 extern tree build_conditional_expr (tree, tree, tree);
 473 extern tree build_compound_expr (tree, tree);
 474 extern tree c_cast_expr (struct c_type_name *, tree);
 475 extern tree build_c_cast (tree, tree);
 476 extern tree build_modify_expr (tree, enum tree_code, tree);
 477 extern void store_init_value (tree, tree);
 478 extern void error_init (const char *);
 479 extern void pedwarn_init (const char *);
 480 extern void maybe_warn_string_init (tree, struct c_expr);
 481 extern void start_init (tree, tree, int);
 482 extern void finish_init (void);
 483 extern void really_start_incremental_init (tree);
 484 extern void push_init_level (int);
 485 extern struct c_expr pop_init_level (int);
 486 extern void set_init_index (tree, tree);
 487 extern void set_init_label (tree);
 488 extern void process_init_element (struct c_expr);
 489 extern tree build_compound_literal (tree, tree);
 490 extern tree c_start_case (tree);
 491 extern void c_finish_case (tree);
 492 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 493 extern tree build_asm_stmt (tree, tree);
 494 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 495 extern int c_types_compatible_p (tree, tree);
 496 extern tree c_begin_compound_stmt (bool);
 497 extern tree c_end_compound_stmt (tree, bool);
 498 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 499 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 500 extern tree c_begin_stmt_expr (void);
 501 extern tree c_finish_stmt_expr (tree);
 502 extern tree c_process_expr_stmt (tree);
 503 extern tree c_finish_expr_stmt (tree);
 504 extern tree c_finish_return (tree);
 505 extern tree c_finish_bc_stmt (tree *, bool);
 506 extern tree c_finish_goto_label (tree);
 507 extern tree c_finish_goto_ptr (tree);
 508
 509 /* Set to 0 at beginning of a function definition, set to 1 if
 510    a return statement that specifies a return value is seen.  */
 511
 512 extern int current_function_returns_value;
 513
 514 /* Set to 0 at beginning of a function definition, set to 1 if
 515    a return statement with no argument is seen.  */
 516
 517 extern int current_function_returns_null;
 518
 519 /* Set to 0 at beginning of a function definition, set to 1 if
 520    a call to a noreturn function is seen.  */
 521
 522 extern int current_function_returns_abnormally;
 523
 524 /* Nonzero means we are reading code that came from a system header file.  */
 525
 526 extern int system_header_p;
 527
 528 /* True means global_bindings_p should return false even if the scope stack
 529    says we are in file scope.  */
 530
 531 extern bool c_override_global_bindings_to_false;
 532
 533 /* True means we've initialized exception handling.  */
 534 extern bool c_eh_initialized_p;
 535
 536 /* In c-decl.c */
 537 extern void c_finish_incomplete_decl (tree);
 538 extern void c_write_global_declarations (void);
 539
 540 /* In order for the format checking to accept the C frontend
 541    diagnostic framework extensions, you must include this file before
 542    toplev.h, not after.  */
 543 #define GCC_DIAG_STYLE __gcc_cdiag__
 544 #if GCC_VERSION >= 3005
 545 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 546 #else
 547 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 548 #endif
 549
 550 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 551 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 552
 553 #endif /* ! GCC_C_TREE_H */