gcc/ginclude/stddef.h

   1 /* Copyright (C) 1989-2020 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
  53 #if defined (__FreeBSD__)
  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__) \
 198   || defined(__DragonFly__) \
 199   || defined(__FreeBSD_kernel__) \
 200   || defined(__VMS__)
 201 /* __size_t is a typedef, must not trash it.  */
 202 #else
 203 #define __size_t
 204 #endif
 205 #ifndef __SIZE_TYPE__
 206 #define __SIZE_TYPE__ long unsigned int
 207 #endif
 208 #if !(defined (__GNUG__) && defined (size_t))
 209 typedef __SIZE_TYPE__ size_t;
 210 #ifdef __BEOS__
 211 typedef long ssize_t;
 212 #endif /* __BEOS__ */
 213 #endif /* !(defined (__GNUG__) && defined (size_t)) */
 214 #endif /* __size_t */
 215 #endif /* _SIZET_ */
 216 #endif /* _GCC_SIZE_T */
 217 #endif /* ___int_size_t_h */
 218 #endif /* _SIZE_T_DECLARED */
 219 #endif /* _BSD_SIZE_T_DEFINED_ */
 220 #endif /* _SIZE_T_DEFINED */
 221 #endif /* _SIZE_T_DEFINED_ */
 222 #endif /* _BSD_SIZE_T_ */
 223 #endif /* _SIZE_T_ */
 224 #endif /* __SIZE_T */
 225 #endif /* _T_SIZE */
 226 #endif /* _T_SIZE_ */
 227 #endif /* _SYS_SIZE_T_H */
 228 #endif /* _SIZE_T */
 229 #endif /* __SIZE_T__ */
 230 #endif /* __size_t__ */
 231 #undef  __need_size_t
 232 #endif /* _STDDEF_H or __need_size_t.  */
 233
 234
 235 /* Wide character type.
 236    Locale-writers should change this as necessary to
 237    be big enough to hold unique values not between 0 and 127,
 238    and not (wchar_t) -1, for each defined multibyte character.  */
 239
 240 /* Define this type if we are doing the whole job,
 241    or if we want this type in particular.  */
 242 #if defined (_STDDEF_H) || defined (__need_wchar_t)
 243 #ifndef __wchar_t__     /* BeOS */
 244 #ifndef __WCHAR_T__     /* Cray Unicos/Mk */
 245 #ifndef _WCHAR_T
 246 #ifndef _T_WCHAR_
 247 #ifndef _T_WCHAR
 248 #ifndef __WCHAR_T
 249 #ifndef _WCHAR_T_
 250 #ifndef _BSD_WCHAR_T_
 251 #ifndef _BSD_WCHAR_T_DEFINED_    /* Darwin */
 252 #ifndef _BSD_RUNE_T_DEFINED_    /* Darwin */
 253 #ifndef _WCHAR_T_DECLARED /* FreeBSD 5 */
 254 #ifndef _WCHAR_T_DEFINED_
 255 #ifndef _WCHAR_T_DEFINED
 256 #ifndef _WCHAR_T_H
 257 #ifndef ___int_wchar_t_h
 258 #ifndef __INT_WCHAR_T_H
 259 #ifndef _GCC_WCHAR_T
 260 #define __wchar_t__     /* BeOS */
 261 #define __WCHAR_T__     /* Cray Unicos/Mk */
 262 #define _WCHAR_T
 263 #define _T_WCHAR_
 264 #define _T_WCHAR
 265 #define __WCHAR_T
 266 #define _WCHAR_T_
 267 #define _BSD_WCHAR_T_
 268 #define _WCHAR_T_DEFINED_
 269 #define _WCHAR_T_DEFINED
 270 #define _WCHAR_T_H
 271 #define ___int_wchar_t_h
 272 #define __INT_WCHAR_T_H
 273 #define _GCC_WCHAR_T
 274 #define _WCHAR_T_DECLARED
 275
 276 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
 277    instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
 278    symbols in the _FOO_T_ family, stays defined even after its
 279    corresponding type is defined).  If we define wchar_t, then we
 280    must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
 281    we undef _WCHAR_T_, then we must also define rune_t, since
 282    headers like runetype.h assume that if machine/ansi.h is included,
 283    and _BSD_WCHAR_T_ is not defined, then rune_t is available.
 284    machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
 285    the same type." */
 286 #ifdef _BSD_WCHAR_T_
 287 #undef _BSD_WCHAR_T_
 288 #ifdef _BSD_RUNE_T_
 289 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 290 typedef _BSD_RUNE_T_ rune_t;
 291 #define _BSD_WCHAR_T_DEFINED_
 292 #define _BSD_RUNE_T_DEFINED_    /* Darwin */
 293 #if defined (__FreeBSD__) && (__FreeBSD__ < 5)
 294 /* Why is this file so hard to maintain properly?  In contrast to
 295    the comment above regarding BSD/386 1.1, on FreeBSD for as long
 296    as the symbol has existed, _BSD_RUNE_T_ must not stay defined or
 297    redundant typedefs will occur when stdlib.h is included after this file. */
 298 #undef _BSD_RUNE_T_
 299 #endif
 300 #endif
 301 #endif
 302 #endif
 303 /* FreeBSD 5 can't be handled well using "traditional" logic above
 304    since it no longer defines _BSD_RUNE_T_ yet still desires to export
 305    rune_t in some cases... */
 306 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 307 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 308 #if __BSD_VISIBLE
 309 #ifndef _RUNE_T_DECLARED
 310 typedef __rune_t        rune_t;
 311 #define _RUNE_T_DECLARED
 312 #endif
 313 #endif
 314 #endif
 315 #endif
 316
 317 #ifndef __WCHAR_TYPE__
 318 #define __WCHAR_TYPE__ int
 319 #endif
 320 #ifndef __cplusplus
 321 typedef __WCHAR_TYPE__ wchar_t;
 322 #endif
 323 #endif
 324 #endif
 325 #endif
 326 #endif
 327 #endif
 328 #endif
 329 #endif /* _WCHAR_T_DECLARED */
 330 #endif /* _BSD_RUNE_T_DEFINED_ */
 331 #endif
 332 #endif
 333 #endif
 334 #endif
 335 #endif
 336 #endif
 337 #endif
 338 #endif /* __WCHAR_T__ */
 339 #endif /* __wchar_t__ */
 340 #undef  __need_wchar_t
 341 #endif /* _STDDEF_H or __need_wchar_t.  */
 342
 343 #if defined (__need_wint_t)
 344 #ifndef _WINT_T
 345 #define _WINT_T
 346
 347 #ifndef __WINT_TYPE__
 348 #define __WINT_TYPE__ unsigned int
 349 #endif
 350 typedef __WINT_TYPE__ wint_t;
 351 #endif
 352 #undef __need_wint_t
 353 #endif
 354
 355 #if defined(__NetBSD__)
 356 /*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
 357     are probably typos and should be removed before 2.8 is released.  */
 358 #ifdef _GCC_PTRDIFF_T_
 359 #undef _PTRDIFF_T_
 360 #undef _BSD_PTRDIFF_T_
 361 #endif
 362 #ifdef _GCC_SIZE_T_
 363 #undef _SIZE_T_
 364 #undef _BSD_SIZE_T_
 365 #endif
 366 #ifdef _GCC_WCHAR_T_
 367 #undef _WCHAR_T_
 368 #undef _BSD_WCHAR_T_
 369 #endif
 370 /*  The following ones are the real ones.  */
 371 #ifdef _GCC_PTRDIFF_T
 372 #undef _PTRDIFF_T_
 373 #undef _BSD_PTRDIFF_T_
 374 #endif
 375 #ifdef _GCC_SIZE_T
 376 #undef _SIZE_T_
 377 #undef _BSD_SIZE_T_
 378 #endif
 379 #ifdef _GCC_WCHAR_T
 380 #undef _WCHAR_T_
 381 #undef _BSD_WCHAR_T_
 382 #endif
 383 #endif /* __NetBSD__ */
 384
 385 #endif /* __sys_stdtypes_h */
 386
 387 /* A null pointer constant.  */
 388
 389 #if defined (_STDDEF_H) || defined (__need_NULL)
 390 #undef NULL             /* in case <stdio.h> has defined it. */
 391 #ifdef __GNUG__
 392 #define NULL __null
 393 #else   /* G++ */
 394 #ifndef __cplusplus
 395 #define NULL ((void *)0)
 396 #else   /* C++ */
 397 #define NULL 0
 398 #endif  /* C++ */
 399 #endif  /* G++ */
 400 #endif  /* NULL not defined and <stddef.h> or need NULL.  */
 401 #undef  __need_NULL
 402
 403 #ifdef _STDDEF_H
 404
 405 /* Offset of member MEMBER in a struct of type TYPE. */
 406 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
 407
 408 #if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) \
 409   || (defined(__cplusplus) && __cplusplus >= 201103L)
 410 #ifndef _GCC_MAX_ALIGN_T
 411 #define _GCC_MAX_ALIGN_T
 412 /* Type whose alignment is supported in every context and is at least
 413    as great as that of any standard type not using alignment
 414    specifiers.  */
 415 typedef struct {
 416   long long __max_align_ll __attribute__((__aligned__(__alignof__(long long))));
 417   long double __max_align_ld __attribute__((__aligned__(__alignof__(long double))));
 418   /* _Float128 is defined as a basic type, so max_align_t must be
 419      sufficiently aligned for it.  This code must work in C++, so we
 420      use __float128 here; that is only available on some
 421      architectures, but only on i386 is extra alignment needed for
 422      __float128.  */
 423 #ifdef __i386__
 424   __float128 __max_align_f128 __attribute__((__aligned__(__alignof(__float128))));
 425 #endif
 426 } max_align_t;
 427 #endif
 428 #endif /* C11 or C++11.  */
 429
 430 #if defined(__cplusplus) && __cplusplus >= 201103L
 431 #ifndef _GXX_NULLPTR_T
 432 #define _GXX_NULLPTR_T
 433   typedef decltype(nullptr) nullptr_t;
 434 #endif
 435 #endif /* C++11.  */
 436
 437 #endif /* _STDDEF_H was defined this time */
 438
 439 #endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__
 440           || __need_XXX was not defined before */