gcc/ginclude/stddef.h

   1 /* Copyright (C) 1989-2013 Free Software Foundation, Inc.
   2
   3 This file is part of GCC.
   4
   5 GCC is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 3, or (at your option)
   8 any later version.
   9
  10 GCC is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 Under Section 7 of GPL version 3, you are granted additional
  16 permissions described in the GCC Runtime Library Exception, version
  17 3.1, as published by the Free Software Foundation.
  18
  19 You should have received a copy of the GNU General Public License and
  20 a copy of the GCC Runtime Library Exception along with this program;
  21 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22 <http://www.gnu.org/licenses/>.  */
  23
  24 /*
  25  * ISO C Standard:  7.17  Common definitions  <stddef.h>
  26  */
  27 #if (!defined(_STDDEF_H) && !defined(_STDDEF_H_) && !defined(_ANSI_STDDEF_H) \
  28      && !defined(__STDDEF_H__)) \
  29     || defined(__need_wchar_t) || defined(__need_size_t) \
  30     || defined(__need_ptrdiff_t) || defined(__need_NULL) \
  31     || defined(__need_wint_t)
  32
  33 /* Any one of these symbols __need_* means that GNU libc
  34    wants us just to define one data type.  So don't define
  35    the symbols that indicate this file's entire job has been done.  */
  36 #if (!defined(__need_wchar_t) && !defined(__need_size_t)        \
  37      && !defined(__need_ptrdiff_t) && !defined(__need_NULL)     \
  38      && !defined(__need_wint_t))
  39 #define _STDDEF_H
  40 #define _STDDEF_H_
  41 /* snaroff@next.com says the NeXT needs this.  */
  42 #define _ANSI_STDDEF_H
  43 #endif
  44
  45 #ifndef __sys_stdtypes_h
  46 /* This avoids lossage on SunOS but only if stdtypes.h comes first.
  47    There's no way to win with the other order!  Sun lossage.  */
  48
  49 /* On 4.3bsd-net2, make sure ansi.h is included, so we have
  50    one less case to deal with in the following.  */
  51 #if defined (__BSD_NET2__) || defined (____386BSD____) || (defined (__FreeBSD__) && (__FreeBSD__ < 5)) || defined(__NetBSD__)
  52 #include <machine/ansi.h>
  53 #endif
  54 /* On FreeBSD 5, machine/ansi.h does not exist anymore... */
  55 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
  56 #include <sys/_types.h>
  57 #endif
  58
  59 /* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are
  60    defined if the corresponding type is *not* defined.
  61    FreeBSD-2.1 defines _MACHINE_ANSI_H_ instead of _ANSI_H_.
  62    NetBSD defines _I386_ANSI_H_ and _X86_64_ANSI_H_ instead of _ANSI_H_ */
  63 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_)  || defined(_I386_ANSI_H_)
  64 #if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_)
  65 #define _SIZE_T
  66 #endif
  67 #if !defined(_PTRDIFF_T_) && !defined(_BSD_PTRDIFF_T_)
  68 #define _PTRDIFF_T
  69 #endif
  70 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
  71    instead of _WCHAR_T_. */
  72 #if !defined(_WCHAR_T_) && !defined(_BSD_WCHAR_T_)
  73 #ifndef _BSD_WCHAR_T_
  74 #define _WCHAR_T
  75 #endif
  76 #endif
  77 /* Undef _FOO_T_ if we are supposed to define foo_t.  */
  78 #if defined (__need_ptrdiff_t) || defined (_STDDEF_H_)
  79 #undef _PTRDIFF_T_
  80 #undef _BSD_PTRDIFF_T_
  81 #endif
  82 #if defined (__need_size_t) || defined (_STDDEF_H_)
  83 #undef _SIZE_T_
  84 #undef _BSD_SIZE_T_
  85 #endif
  86 #if defined (__need_wchar_t) || defined (_STDDEF_H_)
  87 #undef _WCHAR_T_
  88 #undef _BSD_WCHAR_T_
  89 #endif
  90 #endif /* defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_) */
  91
  92 /* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
  93    Just ignore it.  */
  94 #if defined (__sequent__) && defined (_PTRDIFF_T_)
  95 #undef _PTRDIFF_T_
  96 #endif
  97
  98 /* On VxWorks, <type/vxTypesBase.h> may have defined macros like
  99    _TYPE_size_t which will typedef size_t.  fixincludes patched the
 100    vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
 101    not defined, and so that defining this macro defines _GCC_SIZE_T.
 102    If we find that the macros are still defined at this point, we must
 103    invoke them so that the type is defined as expected.  */
 104 #if defined (_TYPE_ptrdiff_t) && (defined (__need_ptrdiff_t) || defined (_STDDEF_H_))
 105 _TYPE_ptrdiff_t;
 106 #undef _TYPE_ptrdiff_t
 107 #endif
 108 #if defined (_TYPE_size_t) && (defined (__need_size_t) || defined (_STDDEF_H_))
 109 _TYPE_size_t;
 110 #undef _TYPE_size_t
 111 #endif
 112 #if defined (_TYPE_wchar_t) && (defined (__need_wchar_t) || defined (_STDDEF_H_))
 113 _TYPE_wchar_t;
 114 #undef _TYPE_wchar_t
 115 #endif
 116
 117 /* In case nobody has defined these types, but we aren't running under
 118    GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
 119    __WCHAR_TYPE__ have reasonable values.  This can happen if the
 120    parts of GCC is compiled by an older compiler, that actually
 121    include gstddef.h, such as collect2.  */
 122
 123 /* Signed type of difference of two pointers.  */
 124
 125 /* Define this type if we are doing the whole job,
 126    or if we want this type in particular.  */
 127 #if defined (_STDDEF_H) || defined (__need_ptrdiff_t)
 128 #ifndef _PTRDIFF_T      /* in case <sys/types.h> has defined it. */
 129 #ifndef _T_PTRDIFF_
 130 #ifndef _T_PTRDIFF
 131 #ifndef __PTRDIFF_T
 132 #ifndef _PTRDIFF_T_
 133 #ifndef _BSD_PTRDIFF_T_
 134 #ifndef ___int_ptrdiff_t_h
 135 #ifndef _GCC_PTRDIFF_T
 136 #define _PTRDIFF_T
 137 #define _T_PTRDIFF_
 138 #define _T_PTRDIFF
 139 #define __PTRDIFF_T
 140 #define _PTRDIFF_T_
 141 #define _BSD_PTRDIFF_T_
 142 #define ___int_ptrdiff_t_h
 143 #define _GCC_PTRDIFF_T
 144 #ifndef __PTRDIFF_TYPE__
 145 #define __PTRDIFF_TYPE__ long int
 146 #endif
 147 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 148 #endif /* _GCC_PTRDIFF_T */
 149 #endif /* ___int_ptrdiff_t_h */
 150 #endif /* _BSD_PTRDIFF_T_ */
 151 #endif /* _PTRDIFF_T_ */
 152 #endif /* __PTRDIFF_T */
 153 #endif /* _T_PTRDIFF */
 154 #endif /* _T_PTRDIFF_ */
 155 #endif /* _PTRDIFF_T */
 156
 157 /* If this symbol has done its job, get rid of it.  */
 158 #undef  __need_ptrdiff_t
 159
 160 #endif /* _STDDEF_H or __need_ptrdiff_t.  */
 161
 162 /* Unsigned type of `sizeof' something.  */
 163
 164 /* Define this type if we are doing the whole job,
 165    or if we want this type in particular.  */
 166 #if defined (_STDDEF_H) || defined (__need_size_t)
 167 #ifndef __size_t__      /* BeOS */
 168 #ifndef __SIZE_T__      /* Cray Unicos/Mk */
 169 #ifndef _SIZE_T /* in case <sys/types.h> has defined it. */
 170 #ifndef _SYS_SIZE_T_H
 171 #ifndef _T_SIZE_
 172 #ifndef _T_SIZE
 173 #ifndef __SIZE_T
 174 #ifndef _SIZE_T_
 175 #ifndef _BSD_SIZE_T_
 176 #ifndef _SIZE_T_DEFINED_
 177 #ifndef _SIZE_T_DEFINED
 178 #ifndef _BSD_SIZE_T_DEFINED_    /* Darwin */
 179 #ifndef _SIZE_T_DECLARED        /* FreeBSD 5 */
 180 #ifndef ___int_size_t_h
 181 #ifndef _GCC_SIZE_T
 182 #ifndef _SIZET_
 183 #ifndef __size_t
 184 #define __size_t__      /* BeOS */
 185 #define __SIZE_T__      /* Cray Unicos/Mk */
 186 #define _SIZE_T
 187 #define _SYS_SIZE_T_H
 188 #define _T_SIZE_
 189 #define _T_SIZE
 190 #define __SIZE_T
 191 #define _SIZE_T_
 192 #define _BSD_SIZE_T_
 193 #define _SIZE_T_DEFINED_
 194 #define _SIZE_T_DEFINED
 195 #define _BSD_SIZE_T_DEFINED_    /* Darwin */
 196 #define _SIZE_T_DECLARED        /* FreeBSD 5 */
 197 #define ___int_size_t_h
 198 #define _GCC_SIZE_T
 199 #define _SIZET_
 200 #if (defined (__FreeBSD__) && (__FreeBSD__ >= 5)) \
 201   || defined(__FreeBSD_kernel__)
 202 /* __size_t is a typedef on FreeBSD 5, must not trash it. */
 203 #elif defined (__VMS__)
 204 /* __size_t is also a typedef on VMS.  */
 205 #else
 206 #define __size_t
 207 #endif
 208 #ifndef __SIZE_TYPE__
 209 #define __SIZE_TYPE__ long unsigned int
 210 #endif
 211 #if !(defined (__GNUG__) && defined (size_t))
 212 typedef __SIZE_TYPE__ size_t;
 213 #ifdef __BEOS__
 214 typedef long ssize_t;
 215 #endif /* __BEOS__ */
 216 #endif /* !(defined (__GNUG__) && defined (size_t)) */
 217 #endif /* __size_t */
 218 #endif /* _SIZET_ */
 219 #endif /* _GCC_SIZE_T */
 220 #endif /* ___int_size_t_h */
 221 #endif /* _SIZE_T_DECLARED */
 222 #endif /* _BSD_SIZE_T_DEFINED_ */
 223 #endif /* _SIZE_T_DEFINED */
 224 #endif /* _SIZE_T_DEFINED_ */
 225 #endif /* _BSD_SIZE_T_ */
 226 #endif /* _SIZE_T_ */
 227 #endif /* __SIZE_T */
 228 #endif /* _T_SIZE */
 229 #endif /* _T_SIZE_ */
 230 #endif /* _SYS_SIZE_T_H */
 231 #endif /* _SIZE_T */
 232 #endif /* __SIZE_T__ */
 233 #endif /* __size_t__ */
 234 #undef  __need_size_t
 235 #endif /* _STDDEF_H or __need_size_t.  */
 236
 237
 238 /* Wide character type.
 239    Locale-writers should change this as necessary to
 240    be big enough to hold unique values not between 0 and 127,
 241    and not (wchar_t) -1, for each defined multibyte character.  */
 242
 243 /* Define this type if we are doing the whole job,
 244    or if we want this type in particular.  */
 245 #if defined (_STDDEF_H) || defined (__need_wchar_t)
 246 #ifndef __wchar_t__     /* BeOS */
 247 #ifndef __WCHAR_T__     /* Cray Unicos/Mk */
 248 #ifndef _WCHAR_T
 249 #ifndef _T_WCHAR_
 250 #ifndef _T_WCHAR
 251 #ifndef __WCHAR_T
 252 #ifndef _WCHAR_T_
 253 #ifndef _BSD_WCHAR_T_
 254 #ifndef _BSD_WCHAR_T_DEFINED_    /* Darwin */
 255 #ifndef _BSD_RUNE_T_DEFINED_    /* Darwin */
 256 #ifndef _WCHAR_T_DECLARED /* FreeBSD 5 */
 257 #ifndef _WCHAR_T_DEFINED_
 258 #ifndef _WCHAR_T_DEFINED
 259 #ifndef _WCHAR_T_H
 260 #ifndef ___int_wchar_t_h
 261 #ifndef __INT_WCHAR_T_H
 262 #ifndef _GCC_WCHAR_T
 263 #define __wchar_t__     /* BeOS */
 264 #define __WCHAR_T__     /* Cray Unicos/Mk */
 265 #define _WCHAR_T
 266 #define _T_WCHAR_
 267 #define _T_WCHAR
 268 #define __WCHAR_T
 269 #define _WCHAR_T_
 270 #define _BSD_WCHAR_T_
 271 #define _WCHAR_T_DEFINED_
 272 #define _WCHAR_T_DEFINED
 273 #define _WCHAR_T_H
 274 #define ___int_wchar_t_h
 275 #define __INT_WCHAR_T_H
 276 #define _GCC_WCHAR_T
 277 #define _WCHAR_T_DECLARED
 278
 279 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
 280    instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
 281    symbols in the _FOO_T_ family, stays defined even after its
 282    corresponding type is defined).  If we define wchar_t, then we
 283    must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
 284    we undef _WCHAR_T_, then we must also define rune_t, since
 285    headers like runetype.h assume that if machine/ansi.h is included,
 286    and _BSD_WCHAR_T_ is not defined, then rune_t is available.
 287    machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
 288    the same type." */
 289 #ifdef _BSD_WCHAR_T_
 290 #undef _BSD_WCHAR_T_
 291 #ifdef _BSD_RUNE_T_
 292 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 293 typedef _BSD_RUNE_T_ rune_t;
 294 #define _BSD_WCHAR_T_DEFINED_
 295 #define _BSD_RUNE_T_DEFINED_    /* Darwin */
 296 #if defined (__FreeBSD__) && (__FreeBSD__ < 5)
 297 /* Why is this file so hard to maintain properly?  In contrast to
 298    the comment above regarding BSD/386 1.1, on FreeBSD for as long
 299    as the symbol has existed, _BSD_RUNE_T_ must not stay defined or
 300    redundant typedefs will occur when stdlib.h is included after this file. */
 301 #undef _BSD_RUNE_T_
 302 #endif
 303 #endif
 304 #endif
 305 #endif
 306 /* FreeBSD 5 can't be handled well using "traditional" logic above
 307    since it no longer defines _BSD_RUNE_T_ yet still desires to export
 308    rune_t in some cases... */
 309 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 310 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 311 #if __BSD_VISIBLE
 312 #ifndef _RUNE_T_DECLARED
 313 typedef __rune_t        rune_t;
 314 #define _RUNE_T_DECLARED
 315 #endif
 316 #endif
 317 #endif
 318 #endif
 319
 320 #ifndef __WCHAR_TYPE__
 321 #define __WCHAR_TYPE__ int
 322 #endif
 323 #ifndef __cplusplus
 324 typedef __WCHAR_TYPE__ wchar_t;
 325 #endif
 326 #endif
 327 #endif
 328 #endif
 329 #endif
 330 #endif
 331 #endif
 332 #endif /* _WCHAR_T_DECLARED */
 333 #endif /* _BSD_RUNE_T_DEFINED_ */
 334 #endif
 335 #endif
 336 #endif
 337 #endif
 338 #endif
 339 #endif
 340 #endif
 341 #endif /* __WCHAR_T__ */
 342 #endif /* __wchar_t__ */
 343 #undef  __need_wchar_t
 344 #endif /* _STDDEF_H or __need_wchar_t.  */
 345
 346 #if defined (__need_wint_t)
 347 #ifndef _WINT_T
 348 #define _WINT_T
 349
 350 #ifndef __WINT_TYPE__
 351 #define __WINT_TYPE__ unsigned int
 352 #endif
 353 typedef __WINT_TYPE__ wint_t;
 354 #endif
 355 #undef __need_wint_t
 356 #endif
 357
 358 /*  In 4.3bsd-net2, leave these undefined to indicate that size_t, etc.
 359     are already defined.  */
 360 /*  BSD/OS 3.1 and FreeBSD [23].x require the MACHINE_ANSI_H check here.  */
 361 /*  NetBSD 5 requires the I386_ANSI_H and X86_64_ANSI_H checks here.  */
 362 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_)
 363 /*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
 364     are probably typos and should be removed before 2.8 is released.  */
 365 #ifdef _GCC_PTRDIFF_T_
 366 #undef _PTRDIFF_T_
 367 #undef _BSD_PTRDIFF_T_
 368 #endif
 369 #ifdef _GCC_SIZE_T_
 370 #undef _SIZE_T_
 371 #undef _BSD_SIZE_T_
 372 #endif
 373 #ifdef _GCC_WCHAR_T_
 374 #undef _WCHAR_T_
 375 #undef _BSD_WCHAR_T_
 376 #endif
 377 /*  The following ones are the real ones.  */
 378 #ifdef _GCC_PTRDIFF_T
 379 #undef _PTRDIFF_T_
 380 #undef _BSD_PTRDIFF_T_
 381 #endif
 382 #ifdef _GCC_SIZE_T
 383 #undef _SIZE_T_
 384 #undef _BSD_SIZE_T_
 385 #endif
 386 #ifdef _GCC_WCHAR_T
 387 #undef _WCHAR_T_
 388 #undef _BSD_WCHAR_T_
 389 #endif
 390 #endif /* _ANSI_H_ || _MACHINE_ANSI_H_ || _X86_64_ANSI_H_ || _I386_ANSI_H_ */
 391
 392 #endif /* __sys_stdtypes_h */
 393
 394 /* A null pointer constant.  */
 395
 396 #if defined (_STDDEF_H) || defined (__need_NULL)
 397 #undef NULL             /* in case <stdio.h> has defined it. */
 398 #ifdef __GNUG__
 399 #define NULL __null
 400 #else   /* G++ */
 401 #ifndef __cplusplus
 402 #define NULL ((void *)0)
 403 #else   /* C++ */
 404 #define NULL 0
 405 #endif  /* C++ */
 406 #endif  /* G++ */
 407 #endif  /* NULL not defined and <stddef.h> or need NULL.  */
 408 #undef  __need_NULL
 409
 410 #ifdef _STDDEF_H
 411
 412 /* Offset of member MEMBER in a struct of type TYPE. */
 413 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
 414
 415 #if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) \
 416   || (defined(__cplusplus) && __cplusplus >= 201103L)
 417 #ifndef _GCC_MAX_ALIGN_T
 418 #define _GCC_MAX_ALIGN_T
 419 /* Type whose alignment is supported in every context and is at least
 420    as great as that of any standard type not using alignment
 421    specifiers.  */
 422 typedef struct {
 423   long long __max_align_ll __attribute__((__aligned__(__alignof__(long long))));
 424   long double __max_align_ld __attribute__((__aligned__(__alignof__(long double))));
 425 } max_align_t;
 426 #endif
 427 #endif /* C11 or C++11.  */
 428
 429 #if defined(__cplusplus) && __cplusplus >= 201103L
 430 #ifndef _GXX_NULLPTR_T
 431 #define _GXX_NULLPTR_T
 432   typedef decltype(nullptr) nullptr_t;
 433 #endif
 434 #endif /* C++11.  */
 435
 436 #endif /* _STDDEF_H was defined this time */
 437
 438 #endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__
 439           || __need_XXX was not defined before */