1 files changed, 110 insertions, 0 deletions
diff --git a/include/iprt/alloca.h b/include/iprt/alloca.h
new file mode 100644
index 00000000..1866d975
--- /dev/null
+++ b/include/iprt/alloca.h
@@ -0,0 +1,110 @@
+/** @file
+ * IPRT - alloca().
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 */
+