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/** @file
* IPRT - alloca().
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
#ifndef IPRT_INCLUDED_alloca_h
#define IPRT_INCLUDED_alloca_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#if defined(IN_RC) || defined(IN_RING0_AGNOSTIC)
# error "No alloca() in raw-mode and agnostic ring-0 context as it may have external dependencies like libgcc."
#endif
/*
* If there are more difficult platforms out there, we'll do OS
* specific #ifdefs. But for now we'll just include the headers
* which normally contains the alloca() prototype.
* When we're in kernel territory it starts getting a bit more
* interesting of course...
*/
#if defined(IN_RING0) \
&& ( defined(RT_OS_DARWIN) \
|| defined(RT_OS_FREEBSD) \
|| defined(RT_OS_LINUX) \
|| defined(RT_OS_NETBSD) \
|| defined(RT_OS_SOLARIS))
/* ASSUMES GNU C */
# define alloca(cb) __builtin_alloca(cb)
#else
# include <stdlib.h>
# if !defined(RT_OS_DARWIN) && !defined(RT_OS_FREEBSD) && !defined(RT_OS_NETBSD)
# include <malloc.h>
# endif
# if defined(RT_OS_SOLARIS) || defined(RT_OS_LINUX)
# include <alloca.h>
# endif
#endif
#endif /* !IPRT_INCLUDED_alloca_h */
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