gcc/ginclude/stddef.h

   1 /* Copyright (C) 1989, 1997, 1998, 1999, 2000, 2002, 2004, 2009, 2011
   2    Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25 /*
  26  * ISO C Standard:  7.17  Common definitions  <stddef.h>
  27  */
  28 #if (!defined(_STDDEF_H) && !defined(_STDDEF_H_) && !defined(_ANSI_STDDEF_H) \
  29      && !defined(__STDDEF_H__)) \
  30     || defined(__need_wchar_t) || defined(__need_size_t) \
  31     || defined(__need_ptrdiff_t) || defined(__need_NULL) \
  32     || defined(__need_wint_t)
  33
  34 /* Any one of these symbols __need_* means that GNU libc
  35    wants us just to define one data type.  So don't define
  36    the symbols that indicate this file's entire job has been done.  */
  37 #if (!defined(__need_wchar_t) && !defined(__need_size_t)        \
  38      && !defined(__need_ptrdiff_t) && !defined(__need_NULL)     \
  39      && !defined(__need_wint_t))
  40 #define _STDDEF_H
  41 #define _STDDEF_H_
  42 /* snaroff@next.com says the NeXT needs this.  */
  43 #define _ANSI_STDDEF_H
  44 /* Irix 5.1 needs this.  */
  45 #define __STDDEF_H__
  46 #endif
  47
  48 #ifndef __sys_stdtypes_h
  49 /* This avoids lossage on SunOS but only if stdtypes.h comes first.
  50    There's no way to win with the other order!  Sun lossage.  */
  51
  52 /* On 4.3bsd-net2, make sure ansi.h is included, so we have
  53    one less case to deal with in the following.  */
  54 #if defined (__BSD_NET2__) || defined (____386BSD____) || (defined (__FreeBSD__) && (__FreeBSD__ < 5)) || defined(__NetBSD__)
  55 #include <machine/ansi.h>
  56 #endif
  57 /* On FreeBSD 5, machine/ansi.h does not exist anymore... */
  58 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
  59 #include <sys/_types.h>
  60 #endif
  61
  62 /* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are
  63    defined if the corresponding type is *not* defined.
  64    FreeBSD-2.1 defines _MACHINE_ANSI_H_ instead of _ANSI_H_.
  65    NetBSD defines _I386_ANSI_H_ and _X86_64_ANSI_H_ instead of _ANSI_H_ */
  66 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_)  || defined(_I386_ANSI_H_)
  67 #if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_)
  68 #define _SIZE_T
  69 #endif
  70 #if !defined(_PTRDIFF_T_) && !defined(_BSD_PTRDIFF_T_)
  71 #define _PTRDIFF_T
  72 #endif
  73 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
  74    instead of _WCHAR_T_. */
  75 #if !defined(_WCHAR_T_) && !defined(_BSD_WCHAR_T_)
  76 #ifndef _BSD_WCHAR_T_
  77 #define _WCHAR_T
  78 #endif
  79 #endif
  80 /* Undef _FOO_T_ if we are supposed to define foo_t.  */
  81 #if defined (__need_ptrdiff_t) || defined (_STDDEF_H_)
  82 #undef _PTRDIFF_T_
  83 #undef _BSD_PTRDIFF_T_
  84 #endif
  85 #if defined (__need_size_t) || defined (_STDDEF_H_)
  86 #undef _SIZE_T_
  87 #undef _BSD_SIZE_T_
  88 #endif
  89 #if defined (__need_wchar_t) || defined (_STDDEF_H_)
  90 #undef _WCHAR_T_
  91 #undef _BSD_WCHAR_T_
  92 #endif
  93 #endif /* defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_) */
  94
  95 /* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
  96    Just ignore it.  */
  97 #if defined (__sequent__) && defined (_PTRDIFF_T_)
  98 #undef _PTRDIFF_T_
  99 #endif
 100
 101 /* On VxWorks, <type/vxTypesBase.h> may have defined macros like
 102    _TYPE_size_t which will typedef size_t.  fixincludes patched the
 103    vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
 104    not defined, and so that defining this macro defines _GCC_SIZE_T.
 105    If we find that the macros are still defined at this point, we must
 106    invoke them so that the type is defined as expected.  */
 107 #if defined (_TYPE_ptrdiff_t) && (defined (__need_ptrdiff_t) || defined (_STDDEF_H_))
 108 _TYPE_ptrdiff_t;
 109 #undef _TYPE_ptrdiff_t
 110 #endif
 111 #if defined (_TYPE_size_t) && (defined (__need_size_t) || defined (_STDDEF_H_))
 112 _TYPE_size_t;
 113 #undef _TYPE_size_t
 114 #endif
 115 #if defined (_TYPE_wchar_t) && (defined (__need_wchar_t) || defined (_STDDEF_H_))
 116 _TYPE_wchar_t;
 117 #undef _TYPE_wchar_t
 118 #endif
 119
 120 /* In case nobody has defined these types, but we aren't running under
 121    GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
 122    __WCHAR_TYPE__ have reasonable values.  This can happen if the
 123    parts of GCC is compiled by an older compiler, that actually
 124    include gstddef.h, such as collect2.  */
 125
 126 /* Signed type of difference of two pointers.  */
 127
 128 /* Define this type if we are doing the whole job,
 129    or if we want this type in particular.  */
 130 #if defined (_STDDEF_H) || defined (__need_ptrdiff_t)
 131 #ifndef _PTRDIFF_T      /* in case <sys/types.h> has defined it. */
 132 #ifndef _T_PTRDIFF_
 133 #ifndef _T_PTRDIFF
 134 #ifndef __PTRDIFF_T
 135 #ifndef _PTRDIFF_T_
 136 #ifndef _BSD_PTRDIFF_T_
 137 #ifndef ___int_ptrdiff_t_h
 138 #ifndef _GCC_PTRDIFF_T
 139 #define _PTRDIFF_T
 140 #define _T_PTRDIFF_
 141 #define _T_PTRDIFF
 142 #define __PTRDIFF_T
 143 #define _PTRDIFF_T_
 144 #define _BSD_PTRDIFF_T_
 145 #define ___int_ptrdiff_t_h
 146 #define _GCC_PTRDIFF_T
 147 #ifndef __PTRDIFF_TYPE__
 148 #define __PTRDIFF_TYPE__ long int
 149 #endif
 150 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 151 #endif /* _GCC_PTRDIFF_T */
 152 #endif /* ___int_ptrdiff_t_h */
 153 #endif /* _BSD_PTRDIFF_T_ */
 154 #endif /* _PTRDIFF_T_ */
 155 #endif /* __PTRDIFF_T */
 156 #endif /* _T_PTRDIFF */
 157 #endif /* _T_PTRDIFF_ */
 158 #endif /* _PTRDIFF_T */
 159
 160 /* If this symbol has done its job, get rid of it.  */
 161 #undef  __need_ptrdiff_t
 162
 163 #endif /* _STDDEF_H or __need_ptrdiff_t.  */
 164
 165 /* Unsigned type of `sizeof' something.  */
 166
 167 /* Define this type if we are doing the whole job,
 168    or if we want this type in particular.  */
 169 #if defined (_STDDEF_H) || defined (__need_size_t)
 170 #ifndef __size_t__      /* BeOS */
 171 #ifndef __SIZE_T__      /* Cray Unicos/Mk */
 172 #ifndef _SIZE_T /* in case <sys/types.h> has defined it. */
 173 #ifndef _SYS_SIZE_T_H
 174 #ifndef _T_SIZE_
 175 #ifndef _T_SIZE
 176 #ifndef __SIZE_T
 177 #ifndef _SIZE_T_
 178 #ifndef _BSD_SIZE_T_
 179 #ifndef _SIZE_T_DEFINED_
 180 #ifndef _SIZE_T_DEFINED
 181 #ifndef _BSD_SIZE_T_DEFINED_    /* Darwin */
 182 #ifndef _SIZE_T_DECLARED        /* FreeBSD 5 */
 183 #ifndef ___int_size_t_h
 184 #ifndef _GCC_SIZE_T
 185 #ifndef _SIZET_
 186 #ifndef __size_t
 187 #define __size_t__      /* BeOS */
 188 #define __SIZE_T__      /* Cray Unicos/Mk */
 189 #define _SIZE_T
 190 #define _SYS_SIZE_T_H
 191 #define _T_SIZE_
 192 #define _T_SIZE
 193 #define __SIZE_T
 194 #define _SIZE_T_
 195 #define _BSD_SIZE_T_
 196 #define _SIZE_T_DEFINED_
 197 #define _SIZE_T_DEFINED
 198 #define _BSD_SIZE_T_DEFINED_    /* Darwin */
 199 #define _SIZE_T_DECLARED        /* FreeBSD 5 */
 200 #define ___int_size_t_h
 201 #define _GCC_SIZE_T
 202 #define _SIZET_
 203 #if (defined (__FreeBSD__) && (__FreeBSD__ >= 5)) \
 204   || defined(__FreeBSD_kernel__)
 205 /* __size_t is a typedef on FreeBSD 5, must not trash it. */
 206 #elif defined (VMS)
 207 /* __size_t is also a typedef on VMS.  */
 208 #else
 209 #define __size_t
 210 #endif
 211 #ifndef __SIZE_TYPE__
 212 #define __SIZE_TYPE__ long unsigned int
 213 #endif
 214 #if !(defined (__GNUG__) && defined (size_t))
 215 typedef __SIZE_TYPE__ size_t;
 216 #ifdef __BEOS__
 217 typedef long ssize_t;
 218 #endif /* __BEOS__ */
 219 #endif /* !(defined (__GNUG__) && defined (size_t)) */
 220 #endif /* __size_t */
 221 #endif /* _SIZET_ */
 222 #endif /* _GCC_SIZE_T */
 223 #endif /* ___int_size_t_h */
 224 #endif /* _SIZE_T_DECLARED */
 225 #endif /* _BSD_SIZE_T_DEFINED_ */
 226 #endif /* _SIZE_T_DEFINED */
 227 #endif /* _SIZE_T_DEFINED_ */
 228 #endif /* _BSD_SIZE_T_ */
 229 #endif /* _SIZE_T_ */
 230 #endif /* __SIZE_T */
 231 #endif /* _T_SIZE */
 232 #endif /* _T_SIZE_ */
 233 #endif /* _SYS_SIZE_T_H */
 234 #endif /* _SIZE_T */
 235 #endif /* __SIZE_T__ */
 236 #endif /* __size_t__ */
 237 #undef  __need_size_t
 238 #endif /* _STDDEF_H or __need_size_t.  */
 239
 240
 241 /* Wide character type.
 242    Locale-writers should change this as necessary to
 243    be big enough to hold unique values not between 0 and 127,
 244    and not (wchar_t) -1, for each defined multibyte character.  */
 245
 246 /* Define this type if we are doing the whole job,
 247    or if we want this type in particular.  */
 248 #if defined (_STDDEF_H) || defined (__need_wchar_t)
 249 #ifndef __wchar_t__     /* BeOS */
 250 #ifndef __WCHAR_T__     /* Cray Unicos/Mk */
 251 #ifndef _WCHAR_T
 252 #ifndef _T_WCHAR_
 253 #ifndef _T_WCHAR
 254 #ifndef __WCHAR_T
 255 #ifndef _WCHAR_T_
 256 #ifndef _BSD_WCHAR_T_
 257 #ifndef _BSD_WCHAR_T_DEFINED_    /* Darwin */
 258 #ifndef _BSD_RUNE_T_DEFINED_    /* Darwin */
 259 #ifndef _WCHAR_T_DECLARED /* FreeBSD 5 */
 260 #ifndef _WCHAR_T_DEFINED_
 261 #ifndef _WCHAR_T_DEFINED
 262 #ifndef _WCHAR_T_H
 263 #ifndef ___int_wchar_t_h
 264 #ifndef __INT_WCHAR_T_H
 265 #ifndef _GCC_WCHAR_T
 266 #define __wchar_t__     /* BeOS */
 267 #define __WCHAR_T__     /* Cray Unicos/Mk */
 268 #define _WCHAR_T
 269 #define _T_WCHAR_
 270 #define _T_WCHAR
 271 #define __WCHAR_T
 272 #define _WCHAR_T_
 273 #define _BSD_WCHAR_T_
 274 #define _WCHAR_T_DEFINED_
 275 #define _WCHAR_T_DEFINED
 276 #define _WCHAR_T_H
 277 #define ___int_wchar_t_h
 278 #define __INT_WCHAR_T_H
 279 #define _GCC_WCHAR_T
 280 #define _WCHAR_T_DECLARED
 281
 282 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
 283    instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
 284    symbols in the _FOO_T_ family, stays defined even after its
 285    corresponding type is defined).  If we define wchar_t, then we
 286    must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
 287    we undef _WCHAR_T_, then we must also define rune_t, since
 288    headers like runetype.h assume that if machine/ansi.h is included,
 289    and _BSD_WCHAR_T_ is not defined, then rune_t is available.
 290    machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
 291    the same type." */
 292 #ifdef _BSD_WCHAR_T_
 293 #undef _BSD_WCHAR_T_
 294 #ifdef _BSD_RUNE_T_
 295 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 296 typedef _BSD_RUNE_T_ rune_t;
 297 #define _BSD_WCHAR_T_DEFINED_
 298 #define _BSD_RUNE_T_DEFINED_    /* Darwin */
 299 #if defined (__FreeBSD__) && (__FreeBSD__ < 5)
 300 /* Why is this file so hard to maintain properly?  In contrast to
 301    the comment above regarding BSD/386 1.1, on FreeBSD for as long
 302    as the symbol has existed, _BSD_RUNE_T_ must not stay defined or
 303    redundant typedefs will occur when stdlib.h is included after this file. */
 304 #undef _BSD_RUNE_T_
 305 #endif
 306 #endif
 307 #endif
 308 #endif
 309 /* FreeBSD 5 can't be handled well using "traditional" logic above
 310    since it no longer defines _BSD_RUNE_T_ yet still desires to export
 311    rune_t in some cases... */
 312 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 313 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 314 #if __BSD_VISIBLE
 315 #ifndef _RUNE_T_DECLARED
 316 typedef __rune_t        rune_t;
 317 #define _RUNE_T_DECLARED
 318 #endif
 319 #endif
 320 #endif
 321 #endif
 322
 323 #ifndef __WCHAR_TYPE__
 324 #define __WCHAR_TYPE__ int
 325 #endif
 326 #ifndef __cplusplus
 327 typedef __WCHAR_TYPE__ wchar_t;
 328 #endif
 329 #endif
 330 #endif
 331 #endif
 332 #endif
 333 #endif
 334 #endif
 335 #endif /* _WCHAR_T_DECLARED */
 336 #endif /* _BSD_RUNE_T_DEFINED_ */
 337 #endif
 338 #endif
 339 #endif
 340 #endif
 341 #endif
 342 #endif
 343 #endif
 344 #endif /* __WCHAR_T__ */
 345 #endif /* __wchar_t__ */
 346 #undef  __need_wchar_t
 347 #endif /* _STDDEF_H or __need_wchar_t.  */
 348
 349 #if defined (__need_wint_t)
 350 #ifndef _WINT_T
 351 #define _WINT_T
 352
 353 #ifndef __WINT_TYPE__
 354 #define __WINT_TYPE__ unsigned int
 355 #endif
 356 typedef __WINT_TYPE__ wint_t;
 357 #endif
 358 #undef __need_wint_t
 359 #endif
 360
 361 /*  In 4.3bsd-net2, leave these undefined to indicate that size_t, etc.
 362     are already defined.  */
 363 /*  BSD/OS 3.1 and FreeBSD [23].x require the MACHINE_ANSI_H check here.  */
 364 /*  NetBSD 5 requires the I386_ANSI_H and X86_64_ANSI_H checks here.  */
 365 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_)
 366 /*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
 367     are probably typos and should be removed before 2.8 is released.  */
 368 #ifdef _GCC_PTRDIFF_T_
 369 #undef _PTRDIFF_T_
 370 #undef _BSD_PTRDIFF_T_
 371 #endif
 372 #ifdef _GCC_SIZE_T_
 373 #undef _SIZE_T_
 374 #undef _BSD_SIZE_T_
 375 #endif
 376 #ifdef _GCC_WCHAR_T_
 377 #undef _WCHAR_T_
 378 #undef _BSD_WCHAR_T_
 379 #endif
 380 /*  The following ones are the real ones.  */
 381 #ifdef _GCC_PTRDIFF_T
 382 #undef _PTRDIFF_T_
 383 #undef _BSD_PTRDIFF_T_
 384 #endif
 385 #ifdef _GCC_SIZE_T
 386 #undef _SIZE_T_
 387 #undef _BSD_SIZE_T_
 388 #endif
 389 #ifdef _GCC_WCHAR_T
 390 #undef _WCHAR_T_
 391 #undef _BSD_WCHAR_T_
 392 #endif
 393 #endif /* _ANSI_H_ || _MACHINE_ANSI_H_ || _X86_64_ANSI_H_ || _I386_ANSI_H_ */
 394
 395 #endif /* __sys_stdtypes_h */
 396
 397 /* A null pointer constant.  */
 398
 399 #if defined (_STDDEF_H) || defined (__need_NULL)
 400 #undef NULL             /* in case <stdio.h> has defined it. */
 401 #ifdef __GNUG__
 402 #define NULL __null
 403 #else   /* G++ */
 404 #ifndef __cplusplus
 405 #define NULL ((void *)0)
 406 #else   /* C++ */
 407 #define NULL 0
 408 #endif  /* C++ */
 409 #endif  /* G++ */
 410 #endif  /* NULL not defined and <stddef.h> or need NULL.  */
 411 #undef  __need_NULL
 412
 413 #ifdef _STDDEF_H
 414
 415 /* Offset of member MEMBER in a struct of type TYPE. */
 416 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
 417
 418 #if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) \
 419   || (defined(__cplusplus) && __cplusplus >= 201103L)
 420 #ifndef _GCC_MAX_ALIGN_T
 421 #define _GCC_MAX_ALIGN_T
 422 /* Type whose alignment is supported in every context and is at least
 423    as great as that of any standard type not using alignment
 424    specifiers.  */
 425 typedef struct {
 426   long long __max_align_ll __attribute__((__aligned__(__alignof__(long long))));
 427   long double __max_align_ld __attribute__((__aligned__(__alignof__(long double))));
 428 } max_align_t;
 429 #endif
 430 #endif /* C11 or C++11.  */
 431
 432 #endif /* _STDDEF_H was defined this time */
 433
 434 #endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__
 435           || __need_XXX was not defined before */