ubuntu/vbox/vboxguest/include/iprt/alloca.h

   1 /** @file
   2  * IPRT - alloca().
   3  */
   4
   5 /*
   6  * Copyright (C) 2006-2017 Oracle Corporation
   7  *
   8  * This file is part of VirtualBox Open Source Edition (OSE), as
   9  * available from http://www.virtualbox.org. This file is free software;
  10  * you can redistribute it and/or modify it under the terms of the GNU
  11  * General Public License (GPL) as published by the Free Software
  12  * Foundation, in version 2 as it comes in the "COPYING" file of the
  13  * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
  14  * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
  15  *
  16  * The contents of this file may alternatively be used under the terms
  17  * of the Common Development and Distribution License Version 1.0
  18  * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
  19  * VirtualBox OSE distribution, in which case the provisions of the
  20  * CDDL are applicable instead of those of the GPL.
  21  *
  22  * You may elect to license modified versions of this file under the
  23  * terms and conditions of either the GPL or the CDDL or both.
  24  */
  25
  26 #ifndef ___iprt_alloca_h
  27 #define ___iprt_alloca_h
  28
  29 #if defined(IN_RC) || defined(IN_RING0_AGNOSTIC)
  30 # error "No alloca() in raw-mode and agnostic ring-0 context as it may have external dependencies like libgcc."
  31 #endif
  32
  33 /*
  34  * If there are more difficult platforms out there, we'll do OS
  35  * specific #ifdefs. But for now we'll just include the headers
  36  * which normally contains the alloca() prototype.
  37  * When we're in kernel territory it starts getting a bit more
  38  * interesting of course...
  39  */
  40 #if defined(IN_RING0) \
  41  && (   defined(RT_OS_DARWIN) \
  42      || defined(RT_OS_FREEBSD) \
  43      || defined(RT_OS_LINUX) \
  44      || defined(RT_OS_NETBSD) \
  45      || defined(RT_OS_SOLARIS))
  46 /* ASSUMES GNU C */
  47 # define alloca(cb) __builtin_alloca(cb)
  48
  49 #else
  50 # include <stdlib.h>
  51 # if !defined(RT_OS_DARWIN) && !defined(RT_OS_FREEBSD) && !defined(RT_OS_NETBSD)
  52 #  include <malloc.h>
  53 # endif
  54 # if defined(RT_OS_SOLARIS) || defined(RT_OS_LINUX)
  55 #  include <alloca.h>
  56 # endif
  57 #endif
  58
  59 #endif
  60