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/** @file
* IPRT - alloca().
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#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)
#elif defined(IPRT_NO_CRT) && defined(RT_OS_WINDOWS)
# include <iprt/types.h>
RT_C_DECLS_BEGIN
# ifdef RT_ARCH_X86
void * __cdecl _alloca(size_t);
# else
void *_alloca(size_t);
# endif
# define alloca _alloca
RT_C_DECLS_END
#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
# if defined(RT_OS_SOLARIS) && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)) \
&& defined(_SYS_REGSET_H) && !defined(IPRT_NO_SOLARIS_UCONTEXT_CLEANUPS)
/* Solaris' sys/regset.h pollutes the namespace with register constants that
frequently conflicts with structure members and variable/parameter names. */
# undef CS
# undef DS
# undef EAX
# undef EBP
# undef EBX
# undef ECX
# undef EDI
# undef EDX
# undef EFL
# undef EIP
# undef ERR
# undef ES
# undef ESI
# undef ESP
# undef FS
# undef GS
# undef SS
# undef TRAPNO
# undef UESP
# endif
#endif
#endif /* !IPRT_INCLUDED_alloca_h */
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