| 1 | /** @file
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| 2 | * IPRT - alloca().
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2006-2022 Oracle Corporation
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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| 24 | */
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| 25 |
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| 26 | #ifndef IPRT_INCLUDED_alloca_h
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| 27 | #define IPRT_INCLUDED_alloca_h
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| 28 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 29 | # pragma once
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| 30 | #endif
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| 31 |
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| 32 | #if defined(IN_RC) || defined(IN_RING0_AGNOSTIC)
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| 33 | # error "No alloca() in raw-mode and agnostic ring-0 context as it may have external dependencies like libgcc."
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| 34 | #endif
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| 35 |
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| 36 | /*
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| 37 | * If there are more difficult platforms out there, we'll do OS
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| 38 | * specific #ifdefs. But for now we'll just include the headers
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| 39 | * which normally contains the alloca() prototype.
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| 40 | * When we're in kernel territory it starts getting a bit more
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| 41 | * interesting of course...
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| 42 | */
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| 43 | #if defined(IN_RING0) \
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| 44 | && ( defined(RT_OS_DARWIN) \
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| 45 | || defined(RT_OS_FREEBSD) \
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| 46 | || defined(RT_OS_LINUX) \
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| 47 | || defined(RT_OS_NETBSD) \
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| 48 | || defined(RT_OS_SOLARIS))
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| 49 | /* ASSUMES GNU C */
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| 50 | # define alloca(cb) __builtin_alloca(cb)
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| 51 |
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| 52 | #elif defined(IPRT_NO_CRT) && defined(RT_OS_WINDOWS)
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| 53 | # include <iprt/types.h>
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| 54 |
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| 55 | RT_C_DECLS_BEGIN
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| 56 | # ifdef RT_ARCH_X86
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| 57 | void * __cdecl _alloca(size_t);
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| 58 | # else
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| 59 | void *_alloca(size_t);
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| 60 | # endif
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| 61 | # define alloca _alloca
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| 62 | RT_C_DECLS_END
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| 63 |
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| 64 | #else
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| 65 | # include <stdlib.h>
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| 66 | # if !defined(RT_OS_DARWIN) && !defined(RT_OS_FREEBSD) && !defined(RT_OS_NETBSD)
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| 67 | # include <malloc.h>
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| 68 | # endif
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| 69 | # if defined(RT_OS_SOLARIS) || defined(RT_OS_LINUX)
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| 70 | # include <alloca.h>
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| 71 | # endif
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| 72 |
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| 73 | # if defined(RT_OS_SOLARIS) && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)) \
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| 74 | && defined(_SYS_REGSET_H) && !defined(IPRT_NO_SOLARIS_UCONTEXT_CLEANUPS)
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| 75 | /* Solaris' sys/regset.h pollutes the namespace with register constants that
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| 76 | frequently conflicts with structure members and variable/parameter names. */
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| 77 | # undef CS
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| 78 | # undef DS
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| 79 | # undef EAX
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| 80 | # undef EBP
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| 81 | # undef EBX
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| 82 | # undef ECX
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| 83 | # undef EDI
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| 84 | # undef EDX
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| 85 | # undef EFL
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| 86 | # undef EIP
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| 87 | # undef ERR
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| 88 | # undef ES
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| 89 | # undef ESI
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| 90 | # undef ESP
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| 91 | # undef FS
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| 92 | # undef GS
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| 93 | # undef SS
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| 94 | # undef TRAPNO
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| 95 | # undef UESP
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| 96 | # endif
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| 97 | #endif
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| 98 |
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| 99 | #endif /* !IPRT_INCLUDED_alloca_h */
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| 100 |
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