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 something other than a storage class specifier or
 209      attribute has been seen.  This is used to warn for the
 210      obsolescent usage of storage class specifiers other than at the
 211      start of the list.  (Doing this properly would require function
 212      specifiers to be handled separately from storage class
 213      specifiers.)  */
 214   BOOL_BITFIELD non_sc_seen_p : 1;
 215   /* Whether the type is specified by a typedef or typeof name.  */
 216   BOOL_BITFIELD typedef_p : 1;
 217   /* Whether a struct, union or enum type either had its content
 218      defined by a type specifier in the list or was the first visible
 219      declaration of its tag.  */
 220   BOOL_BITFIELD tag_defined_p : 1;
 221   /* Whether the type is explicitly "signed" or specified by a typedef
 222      whose type is explicitly "signed".  */
 223   BOOL_BITFIELD explicit_signed_p : 1;
 224   /* Whether the specifiers include a deprecated typedef.  */
 225   BOOL_BITFIELD deprecated_p : 1;
 226   /* Whether the type defaulted to "int" because there were no type
 227      specifiers.  */
 228   BOOL_BITFIELD default_int_p;
 229   /* Whether "long" was specified.  */
 230   BOOL_BITFIELD long_p : 1;
 231   /* Whether "long" was specified more than once.  */
 232   BOOL_BITFIELD long_long_p : 1;
 233   /* Whether "short" was specified.  */
 234   BOOL_BITFIELD short_p : 1;
 235   /* Whether "signed" was specified.  */
 236   BOOL_BITFIELD signed_p : 1;
 237   /* Whether "unsigned" was specified.  */
 238   BOOL_BITFIELD unsigned_p : 1;
 239   /* Whether "complex" was specified.  */
 240   BOOL_BITFIELD complex_p : 1;
 241   /* Whether "inline" was specified.  */
 242   BOOL_BITFIELD inline_p : 1;
 243   /* Whether "__thread" was specified.  */
 244   BOOL_BITFIELD thread_p : 1;
 245   /* Whether "const" was specified.  */
 246   BOOL_BITFIELD const_p : 1;
 247   /* Whether "volatile" was specified.  */
 248   BOOL_BITFIELD volatile_p : 1;
 249   /* Whether "restrict" was specified.  */
 250   BOOL_BITFIELD restrict_p : 1;
 251 };
 252
 253 /* The various kinds of declarators in C.  */
 254 enum c_declarator_kind {
 255   /* An identifier.  */
 256   cdk_id,
 257   /* A function.  */
 258   cdk_function,
 259   /* An array.  */
 260   cdk_array,
 261   /* A pointer.  */
 262   cdk_pointer,
 263   /* Parenthesized declarator with nested attributes.  */
 264   cdk_attrs
 265 };
 266
 267 /* Information about the parameters in a function declarator.  */
 268 struct c_arg_info {
 269   /* A list of parameter decls.  */
 270   tree parms;
 271   /* A list of structure, union and enum tags defined.  */
 272   tree tags;
 273   /* A list of argument types to go in the FUNCTION_TYPE.  */
 274   tree types;
 275   /* A list of non-parameter decls (notably enumeration constants)
 276      defined with the parameters.  */
 277   tree others;
 278 };
 279
 280 /* A declarator.  */
 281 struct c_declarator {
 282   /* The kind of declarator.  */
 283   enum c_declarator_kind kind;
 284   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 285   struct c_declarator *declarator;
 286   union {
 287     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 288        declarator.  */
 289     tree id;
 290     /* For functions.  */
 291     struct c_arg_info *arg_info;
 292     /* For arrays.  */
 293     struct {
 294       /* The array dimension, or NULL for [] and [*].  */
 295       tree dimen;
 296       /* The qualifiers inside [].  */
 297       int quals;
 298       /* The attributes (currently ignored) inside [].  */
 299       tree attrs;
 300       /* Whether [static] was used.  */
 301       BOOL_BITFIELD static_p : 1;
 302       /* Whether [*] was used.  */
 303       BOOL_BITFIELD vla_unspec_p : 1;
 304     } array;
 305     /* For pointers, the qualifiers on the pointer type.  */
 306     int pointer_quals;
 307     /* For attributes.  */
 308     tree attrs;
 309   } u;
 310 };
 311
 312 /* A type name.  */
 313 struct c_type_name {
 314   /* The declaration specifiers.  */
 315   struct c_declspecs *specs;
 316   /* The declarator.  */
 317   struct c_declarator *declarator;
 318 };
 319
 320 /* A parameter.  */
 321 struct c_parm {
 322   /* The declaration specifiers, minus any prefix attributes.  */
 323   struct c_declspecs *specs;
 324   /* The attributes.  */
 325   tree attrs;
 326   /* The declarator.  */
 327   struct c_declarator *declarator;
 328 };
 329
 330 /* Save and restore the variables in this file and elsewhere
 331    that keep track of the progress of compilation of the current function.
 332    Used for nested functions.  */
 333
 334 struct language_function GTY(())
 335 {
 336   struct c_language_function base;
 337   tree x_break_label;
 338   tree x_cont_label;
 339   struct c_switch * GTY((skip)) x_switch_stack;
 340   struct c_arg_info * GTY((skip)) arg_info;
 341   int returns_value;
 342   int returns_null;
 343   int returns_abnormally;
 344   int warn_about_return_type;
 345   int extern_inline;
 346 };
 347
 348 \f
 349 /* in c-parse.in */
 350 extern void c_parse_init (void);
 351
 352 /* in c-aux-info.c */
 353 extern void gen_aux_info_record (tree, int, int, int);
 354
 355 /* in c-decl.c */
 356 extern struct obstack parser_obstack;
 357 extern tree c_break_label;
 358 extern tree c_cont_label;
 359
 360 extern int global_bindings_p (void);
 361 extern void push_scope (void);
 362 extern tree pop_scope (void);
 363 extern void insert_block (tree);
 364 extern tree pushdecl (tree);
 365 extern void c_expand_body (tree);
 366
 367 extern void c_init_decl_processing (void);
 368 extern void c_dup_lang_specific_decl (tree);
 369 extern void c_print_identifier (FILE *, tree, int);
 370 extern int quals_from_declspecs (const struct c_declspecs *);
 371 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 372                                                     bool, bool);
 373 extern tree build_enumerator (tree, tree);
 374 extern void check_for_loop_decls (void);
 375 extern void mark_forward_parm_decls (void);
 376 extern int  complete_array_type (tree, tree, int);
 377 extern void declare_parm_level (void);
 378 extern void undeclared_variable (tree);
 379 extern tree declare_label (tree);
 380 extern tree define_label (location_t, tree);
 381 extern void finish_decl (tree, tree, tree);
 382 extern tree finish_enum (tree, tree, tree);
 383 extern void finish_function (void);
 384 extern tree finish_struct (tree, tree, tree);
 385 extern struct c_arg_info *get_parm_info (bool);
 386 extern tree grokfield (struct c_declarator *, struct c_declspecs *, tree);
 387 extern tree groktypename (struct c_type_name *);
 388 extern tree grokparm (const struct c_parm *);
 389 extern tree implicitly_declare (tree);
 390 extern void keep_next_level (void);
 391 extern tree lookup_name (tree);
 392 extern void pending_xref_error (void);
 393 extern void c_push_function_context (struct function *);
 394 extern void c_pop_function_context (struct function *);
 395 extern void push_parm_decl (const struct c_parm *);
 396 extern tree pushdecl_top_level (tree);
 397 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 398                                                         struct c_declarator *,
 399                                                         bool);
 400 extern tree builtin_function (const char *, tree, int, enum built_in_class,
 401                               const char *, tree);
 402 extern void shadow_tag (const struct c_declspecs *);
 403 extern void shadow_tag_warned (const struct c_declspecs *, int);
 404 extern tree start_enum (tree);
 405 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 406 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 407                         tree);
 408 extern tree start_struct (enum tree_code, tree);
 409 extern void store_parm_decls (void);
 410 extern void store_parm_decls_from (struct c_arg_info *);
 411 extern tree xref_tag (enum tree_code, tree);
 412 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 413 extern int c_expand_decl (tree);
 414 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 415                                     struct c_declarator *);
 416 extern struct c_declarator *build_attrs_declarator (tree,
 417                                                     struct c_declarator *);
 418 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 419                                                        struct c_declarator *);
 420 extern struct c_declarator *build_id_declarator (tree);
 421 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 422                                                      struct c_declarator *);
 423 extern struct c_declspecs *build_null_declspecs (void);
 424 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 425 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 426                                                struct c_typespec);
 427 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 428 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 429 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 430
 431 /* in c-objc-common.c */
 432 extern int c_disregard_inline_limits (tree);
 433 extern int c_cannot_inline_tree_fn (tree *);
 434 extern bool c_objc_common_init (void);
 435 extern bool c_missing_noreturn_ok_p (tree);
 436 extern tree c_objc_common_truthvalue_conversion (tree expr);
 437 extern bool c_warn_unused_global_decl (tree);
 438 extern void c_initialize_diagnostics (diagnostic_context *);
 439
 440 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 441   c_build_qualified_type ((TYPE),                                 \
 442                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 443                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 444
 445 /* in c-typeck.c */
 446 extern int in_alignof;
 447 extern int in_sizeof;
 448 extern int in_typeof;
 449
 450 extern struct c_switch *c_switch_stack;
 451
 452 extern tree require_complete_type (tree);
 453 extern int same_translation_unit_p (tree, tree);
 454 extern int comptypes (tree, tree);
 455 extern bool c_mark_addressable (tree);
 456 extern void c_incomplete_type_error (tree, tree);
 457 extern tree c_type_promotes_to (tree);
 458 extern tree composite_type (tree, tree);
 459 extern tree build_component_ref (tree, tree);
 460 extern tree build_indirect_ref (tree, const char *);
 461 extern tree build_array_ref (tree, tree);
 462 extern tree build_external_ref (tree, int);
 463 extern void pop_maybe_used (bool);
 464 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 465 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 466 extern struct c_expr parser_build_binary_op (enum tree_code, struct c_expr,
 467                                              struct c_expr);
 468 extern tree build_conditional_expr (tree, tree, tree);
 469 extern tree build_compound_expr (tree, tree);
 470 extern tree c_cast_expr (struct c_type_name *, tree);
 471 extern tree build_c_cast (tree, tree);
 472 extern tree build_modify_expr (tree, enum tree_code, tree);
 473 extern void store_init_value (tree, tree);
 474 extern void error_init (const char *);
 475 extern void pedwarn_init (const char *);
 476 extern void maybe_warn_string_init (tree, struct c_expr);
 477 extern void start_init (tree, tree, int);
 478 extern void finish_init (void);
 479 extern void really_start_incremental_init (tree);
 480 extern void push_init_level (int);
 481 extern struct c_expr pop_init_level (int);
 482 extern void set_init_index (tree, tree);
 483 extern void set_init_label (tree);
 484 extern void process_init_element (struct c_expr);
 485 extern tree build_compound_literal (tree, tree);
 486 extern tree c_start_case (tree);
 487 extern void c_finish_case (tree);
 488 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 489 extern tree build_asm_stmt (tree, tree);
 490 extern tree c_convert_parm_for_inlining (tree, tree, tree, int);
 491 extern int c_types_compatible_p (tree, tree);
 492 extern tree c_begin_compound_stmt (bool);
 493 extern tree c_end_compound_stmt (tree, bool);
 494 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 495 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 496 extern tree c_begin_stmt_expr (void);
 497 extern tree c_finish_stmt_expr (tree);
 498 extern tree c_process_expr_stmt (tree);
 499 extern tree c_finish_expr_stmt (tree);
 500 extern tree c_finish_return (tree);
 501 extern tree c_finish_bc_stmt (tree *, bool);
 502 extern tree c_finish_goto_label (tree);
 503 extern tree c_finish_goto_ptr (tree);
 504
 505 /* Set to 0 at beginning of a function definition, set to 1 if
 506    a return statement that specifies a return value is seen.  */
 507
 508 extern int current_function_returns_value;
 509
 510 /* Set to 0 at beginning of a function definition, set to 1 if
 511    a return statement with no argument is seen.  */
 512
 513 extern int current_function_returns_null;
 514
 515 /* Set to 0 at beginning of a function definition, set to 1 if
 516    a call to a noreturn function is seen.  */
 517
 518 extern int current_function_returns_abnormally;
 519
 520 /* Nonzero means we are reading code that came from a system header file.  */
 521
 522 extern int system_header_p;
 523
 524 /* True means global_bindings_p should return false even if the scope stack
 525    says we are in file scope.  */
 526
 527 extern bool c_override_global_bindings_to_false;
 528
 529 /* True means we've initialized exception handling.  */
 530 extern bool c_eh_initialized_p;
 531
 532 /* In c-decl.c */
 533 extern void c_finish_incomplete_decl (tree);
 534 extern void c_write_global_declarations (void);
 535
 536 /* In order for the format checking to accept the C frontend
 537    diagnostic framework extensions, you must include this file before
 538    toplev.h, not after.  */
 539 #define GCC_DIAG_STYLE __gcc_cdiag__
 540 #if GCC_VERSION >= 3005
 541 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 542 #else
 543 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 544 #endif
 545
 546 extern void pedwarn_c90 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 547 extern void pedwarn_c99 (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
 548
 549 #endif /* ! GCC_C_TREE_H */