gcc/ginclude/stddef.h

   1 /* Copyright (C) 1989-2018 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 #if defined(__NetBSD__)
  50 #include <machine/ansi.h>
  51 #endif
  52 /* On FreeBSD 5, machine/ansi.h does not exist anymore... */
  53 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
  54 #include <sys/_types.h>
  55 #endif
  56
  57 #if defined(__NetBSD__)
  58 #if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_)
  59 #define _SIZE_T
  60 #endif
  61 #if !defined(_PTRDIFF_T_) && !defined(_BSD_PTRDIFF_T_)
  62 #define _PTRDIFF_T
  63 #endif
  64 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
  65    instead of _WCHAR_T_. */
  66 #if !defined(_WCHAR_T_) && !defined(_BSD_WCHAR_T_)
  67 #ifndef _BSD_WCHAR_T_
  68 #define _WCHAR_T
  69 #endif
  70 #endif
  71 /* Undef _FOO_T_ if we are supposed to define foo_t.  */
  72 #if defined (__need_ptrdiff_t) || defined (_STDDEF_H_)
  73 #undef _PTRDIFF_T_
  74 #undef _BSD_PTRDIFF_T_
  75 #endif
  76 #if defined (__need_size_t) || defined (_STDDEF_H_)
  77 #undef _SIZE_T_
  78 #undef _BSD_SIZE_T_
  79 #endif
  80 #if defined (__need_wchar_t) || defined (_STDDEF_H_)
  81 #undef _WCHAR_T_
  82 #undef _BSD_WCHAR_T_
  83 #endif
  84 #endif /* defined(__NetBSD__) */
  85
  86 /* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
  87    Just ignore it.  */
  88 #if defined (__sequent__) && defined (_PTRDIFF_T_)
  89 #undef _PTRDIFF_T_
  90 #endif
  91
  92 /* On VxWorks, <type/vxTypesBase.h> may have defined macros like
  93    _TYPE_size_t which will typedef size_t.  fixincludes patched the
  94    vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
  95    not defined, and so that defining this macro defines _GCC_SIZE_T.
  96    If we find that the macros are still defined at this point, we must
  97    invoke them so that the type is defined as expected.  */
  98 #if defined (_TYPE_ptrdiff_t) && (defined (__need_ptrdiff_t) || defined (_STDDEF_H_))
  99 _TYPE_ptrdiff_t;
 100 #undef _TYPE_ptrdiff_t
 101 #endif
 102 #if defined (_TYPE_size_t) && (defined (__need_size_t) || defined (_STDDEF_H_))
 103 _TYPE_size_t;
 104 #undef _TYPE_size_t
 105 #endif
 106 #if defined (_TYPE_wchar_t) && (defined (__need_wchar_t) || defined (_STDDEF_H_))
 107 _TYPE_wchar_t;
 108 #undef _TYPE_wchar_t
 109 #endif
 110
 111 /* In case nobody has defined these types, but we aren't running under
 112    GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
 113    __WCHAR_TYPE__ have reasonable values.  This can happen if the
 114    parts of GCC is compiled by an older compiler, that actually
 115    include gstddef.h, such as collect2.  */
 116
 117 /* Signed type of difference of two pointers.  */
 118
 119 /* Define this type if we are doing the whole job,
 120    or if we want this type in particular.  */
 121 #if defined (_STDDEF_H) || defined (__need_ptrdiff_t)
 122 #ifndef _PTRDIFF_T      /* in case <sys/types.h> has defined it. */
 123 #ifndef _T_PTRDIFF_
 124 #ifndef _T_PTRDIFF
 125 #ifndef __PTRDIFF_T
 126 #ifndef _PTRDIFF_T_
 127 #ifndef _BSD_PTRDIFF_T_
 128 #ifndef ___int_ptrdiff_t_h
 129 #ifndef _GCC_PTRDIFF_T
 130 #ifndef _PTRDIFF_T_DECLARED /* DragonFly */
 131 #define _PTRDIFF_T
 132 #define _T_PTRDIFF_
 133 #define _T_PTRDIFF
 134 #define __PTRDIFF_T
 135 #define _PTRDIFF_T_
 136 #define _BSD_PTRDIFF_T_
 137 #define ___int_ptrdiff_t_h
 138 #define _GCC_PTRDIFF_T
 139 #define _PTRDIFF_T_DECLARED
 140 #ifndef __PTRDIFF_TYPE__
 141 #define __PTRDIFF_TYPE__ long int
 142 #endif
 143 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 144 #endif /* _PTRDIFF_T_DECLARED */
 145 #endif /* _GCC_PTRDIFF_T */
 146 #endif /* ___int_ptrdiff_t_h */
 147 #endif /* _BSD_PTRDIFF_T_ */
 148 #endif /* _PTRDIFF_T_ */
 149 #endif /* __PTRDIFF_T */
 150 #endif /* _T_PTRDIFF */
 151 #endif /* _T_PTRDIFF_ */
 152 #endif /* _PTRDIFF_T */
 153
 154 /* If this symbol has done its job, get rid of it.  */
 155 #undef  __need_ptrdiff_t
 156
 157 #endif /* _STDDEF_H or __need_ptrdiff_t.  */
 158
 159 /* Unsigned type of `sizeof' something.  */
 160
 161 /* Define this type if we are doing the whole job,
 162    or if we want this type in particular.  */
 163 #if defined (_STDDEF_H) || defined (__need_size_t)
 164 #ifndef __size_t__      /* BeOS */
 165 #ifndef __SIZE_T__      /* Cray Unicos/Mk */
 166 #ifndef _SIZE_T /* in case <sys/types.h> has defined it. */
 167 #ifndef _SYS_SIZE_T_H
 168 #ifndef _T_SIZE_
 169 #ifndef _T_SIZE
 170 #ifndef __SIZE_T
 171 #ifndef _SIZE_T_
 172 #ifndef _BSD_SIZE_T_
 173 #ifndef _SIZE_T_DEFINED_
 174 #ifndef _SIZE_T_DEFINED
 175 #ifndef _BSD_SIZE_T_DEFINED_    /* Darwin */
 176 #ifndef _SIZE_T_DECLARED        /* FreeBSD 5 */
 177 #ifndef ___int_size_t_h
 178 #ifndef _GCC_SIZE_T
 179 #ifndef _SIZET_
 180 #ifndef __size_t
 181 #define __size_t__      /* BeOS */
 182 #define __SIZE_T__      /* Cray Unicos/Mk */
 183 #define _SIZE_T
 184 #define _SYS_SIZE_T_H
 185 #define _T_SIZE_
 186 #define _T_SIZE
 187 #define __SIZE_T
 188 #define _SIZE_T_
 189 #define _BSD_SIZE_T_
 190 #define _SIZE_T_DEFINED_
 191 #define _SIZE_T_DEFINED
 192 #define _BSD_SIZE_T_DEFINED_    /* Darwin */
 193 #define _SIZE_T_DECLARED        /* FreeBSD 5 */
 194 #define ___int_size_t_h
 195 #define _GCC_SIZE_T
 196 #define _SIZET_
 197 #if (defined (__FreeBSD__) && (__FreeBSD__ >= 5)) \
 198   || defined(__DragonFly__) \
 199   || defined(__FreeBSD_kernel__)
 200 /* __size_t is a typedef on FreeBSD 5, must not trash it. */
 201 #elif defined (__VMS__)
 202 /* __size_t is also a typedef on VMS.  */
 203 #else
 204 #define __size_t
 205 #endif
 206 #ifndef __SIZE_TYPE__
 207 #define __SIZE_TYPE__ long unsigned int
 208 #endif
 209 #if !(defined (__GNUG__) && defined (size_t))
 210 typedef __SIZE_TYPE__ size_t;
 211 #ifdef __BEOS__
 212 typedef long ssize_t;
 213 #endif /* __BEOS__ */
 214 #endif /* !(defined (__GNUG__) && defined (size_t)) */
 215 #endif /* __size_t */
 216 #endif /* _SIZET_ */
 217 #endif /* _GCC_SIZE_T */
 218 #endif /* ___int_size_t_h */
 219 #endif /* _SIZE_T_DECLARED */
 220 #endif /* _BSD_SIZE_T_DEFINED_ */
 221 #endif /* _SIZE_T_DEFINED */
 222 #endif /* _SIZE_T_DEFINED_ */
 223 #endif /* _BSD_SIZE_T_ */
 224 #endif /* _SIZE_T_ */
 225 #endif /* __SIZE_T */
 226 #endif /* _T_SIZE */
 227 #endif /* _T_SIZE_ */
 228 #endif /* _SYS_SIZE_T_H */
 229 #endif /* _SIZE_T */
 230 #endif /* __SIZE_T__ */
 231 #endif /* __size_t__ */
 232 #undef  __need_size_t
 233 #endif /* _STDDEF_H or __need_size_t.  */
 234
 235
 236 /* Wide character type.
 237    Locale-writers should change this as necessary to
 238    be big enough to hold unique values not between 0 and 127,
 239    and not (wchar_t) -1, for each defined multibyte character.  */
 240
 241 /* Define this type if we are doing the whole job,
 242    or if we want this type in particular.  */
 243 #if defined (_STDDEF_H) || defined (__need_wchar_t)
 244 #ifndef __wchar_t__     /* BeOS */
 245 #ifndef __WCHAR_T__     /* Cray Unicos/Mk */
 246 #ifndef _WCHAR_T
 247 #ifndef _T_WCHAR_
 248 #ifndef _T_WCHAR
 249 #ifndef __WCHAR_T
 250 #ifndef _WCHAR_T_
 251 #ifndef _BSD_WCHAR_T_
 252 #ifndef _BSD_WCHAR_T_DEFINED_    /* Darwin */
 253 #ifndef _BSD_RUNE_T_DEFINED_    /* Darwin */
 254 #ifndef _WCHAR_T_DECLARED /* FreeBSD 5 */
 255 #ifndef _WCHAR_T_DEFINED_
 256 #ifndef _WCHAR_T_DEFINED
 257 #ifndef _WCHAR_T_H
 258 #ifndef ___int_wchar_t_h
 259 #ifndef __INT_WCHAR_T_H
 260 #ifndef _GCC_WCHAR_T
 261 #define __wchar_t__     /* BeOS */
 262 #define __WCHAR_T__     /* Cray Unicos/Mk */
 263 #define _WCHAR_T
 264 #define _T_WCHAR_
 265 #define _T_WCHAR
 266 #define __WCHAR_T
 267 #define _WCHAR_T_
 268 #define _BSD_WCHAR_T_
 269 #define _WCHAR_T_DEFINED_
 270 #define _WCHAR_T_DEFINED
 271 #define _WCHAR_T_H
 272 #define ___int_wchar_t_h
 273 #define __INT_WCHAR_T_H
 274 #define _GCC_WCHAR_T
 275 #define _WCHAR_T_DECLARED
 276
 277 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
 278    instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
 279    symbols in the _FOO_T_ family, stays defined even after its
 280    corresponding type is defined).  If we define wchar_t, then we
 281    must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
 282    we undef _WCHAR_T_, then we must also define rune_t, since
 283    headers like runetype.h assume that if machine/ansi.h is included,
 284    and _BSD_WCHAR_T_ is not defined, then rune_t is available.
 285    machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
 286    the same type." */
 287 #ifdef _BSD_WCHAR_T_
 288 #undef _BSD_WCHAR_T_
 289 #ifdef _BSD_RUNE_T_
 290 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 291 typedef _BSD_RUNE_T_ rune_t;
 292 #define _BSD_WCHAR_T_DEFINED_
 293 #define _BSD_RUNE_T_DEFINED_    /* Darwin */
 294 #if defined (__FreeBSD__) && (__FreeBSD__ < 5)
 295 /* Why is this file so hard to maintain properly?  In contrast to
 296    the comment above regarding BSD/386 1.1, on FreeBSD for as long
 297    as the symbol has existed, _BSD_RUNE_T_ must not stay defined or
 298    redundant typedefs will occur when stdlib.h is included after this file. */
 299 #undef _BSD_RUNE_T_
 300 #endif
 301 #endif
 302 #endif
 303 #endif
 304 /* FreeBSD 5 can't be handled well using "traditional" logic above
 305    since it no longer defines _BSD_RUNE_T_ yet still desires to export
 306    rune_t in some cases... */
 307 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 308 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 309 #if __BSD_VISIBLE
 310 #ifndef _RUNE_T_DECLARED
 311 typedef __rune_t        rune_t;
 312 #define _RUNE_T_DECLARED
 313 #endif
 314 #endif
 315 #endif
 316 #endif
 317
 318 #ifndef __WCHAR_TYPE__
 319 #define __WCHAR_TYPE__ int
 320 #endif
 321 #ifndef __cplusplus
 322 typedef __WCHAR_TYPE__ wchar_t;
 323 #endif
 324 #endif
 325 #endif
 326 #endif
 327 #endif
 328 #endif
 329 #endif
 330 #endif /* _WCHAR_T_DECLARED */
 331 #endif /* _BSD_RUNE_T_DEFINED_ */
 332 #endif
 333 #endif
 334 #endif
 335 #endif
 336 #endif
 337 #endif
 338 #endif
 339 #endif /* __WCHAR_T__ */
 340 #endif /* __wchar_t__ */
 341 #undef  __need_wchar_t
 342 #endif /* _STDDEF_H or __need_wchar_t.  */
 343
 344 #if defined (__need_wint_t)
 345 #ifndef _WINT_T
 346 #define _WINT_T
 347
 348 #ifndef __WINT_TYPE__
 349 #define __WINT_TYPE__ unsigned int
 350 #endif
 351 typedef __WINT_TYPE__ wint_t;
 352 #endif
 353 #undef __need_wint_t
 354 #endif
 355
 356 #if defined(__NetBSD__)
 357 /*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
 358     are probably typos and should be removed before 2.8 is released.  */
 359 #ifdef _GCC_PTRDIFF_T_
 360 #undef _PTRDIFF_T_
 361 #undef _BSD_PTRDIFF_T_
 362 #endif
 363 #ifdef _GCC_SIZE_T_
 364 #undef _SIZE_T_
 365 #undef _BSD_SIZE_T_
 366 #endif
 367 #ifdef _GCC_WCHAR_T_
 368 #undef _WCHAR_T_
 369 #undef _BSD_WCHAR_T_
 370 #endif
 371 /*  The following ones are the real ones.  */
 372 #ifdef _GCC_PTRDIFF_T
 373 #undef _PTRDIFF_T_
 374 #undef _BSD_PTRDIFF_T_
 375 #endif
 376 #ifdef _GCC_SIZE_T
 377 #undef _SIZE_T_
 378 #undef _BSD_SIZE_T_
 379 #endif
 380 #ifdef _GCC_WCHAR_T
 381 #undef _WCHAR_T_
 382 #undef _BSD_WCHAR_T_
 383 #endif
 384 #endif /* __NetBSD__ */
 385
 386 #endif /* __sys_stdtypes_h */
 387
 388 /* A null pointer constant.  */
 389
 390 #if defined (_STDDEF_H) || defined (__need_NULL)
 391 #undef NULL             /* in case <stdio.h> has defined it. */
 392 #ifdef __GNUG__
 393 #define NULL __null
 394 #else   /* G++ */
 395 #ifndef __cplusplus
 396 #define NULL ((void *)0)
 397 #else   /* C++ */
 398 #define NULL 0
 399 #endif  /* C++ */
 400 #endif  /* G++ */
 401 #endif  /* NULL not defined and <stddef.h> or need NULL.  */
 402 #undef  __need_NULL
 403
 404 #ifdef _STDDEF_H
 405
 406 /* Offset of member MEMBER in a struct of type TYPE. */
 407 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
 408
 409 #if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) \
 410   || (defined(__cplusplus) && __cplusplus >= 201103L)
 411 #ifndef _GCC_MAX_ALIGN_T
 412 #define _GCC_MAX_ALIGN_T
 413 /* Type whose alignment is supported in every context and is at least
 414    as great as that of any standard type not using alignment
 415    specifiers.  */
 416 typedef struct {
 417   long long __max_align_ll __attribute__((__aligned__(__alignof__(long long))));
 418   long double __max_align_ld __attribute__((__aligned__(__alignof__(long double))));
 419   /* _Float128 is defined as a basic type, so max_align_t must be
 420      sufficiently aligned for it.  This code must work in C++, so we
 421      use __float128 here; that is only available on some
 422      architectures, but only on i386 is extra alignment needed for
 423      __float128.  */
 424 #ifdef __i386__
 425   __float128 __max_align_f128 __attribute__((__aligned__(__alignof(__float128))));
 426 #endif
 427 } max_align_t;
 428 #endif
 429 #endif /* C11 or C++11.  */
 430
 431 #if defined(__cplusplus) && __cplusplus >= 201103L
 432 #ifndef _GXX_NULLPTR_T
 433 #define _GXX_NULLPTR_T
 434   typedef decltype(nullptr) nullptr_t;
 435 #endif
 436 #endif /* C++11.  */
 437
 438 #endif /* _STDDEF_H was defined this time */
 439
 440 #endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__
 441           || __need_XXX was not defined before */