1 files changed, 63 insertions, 0 deletions
diff --git a/include/iprt/alloca.h b/include/iprt/alloca.h
new file mode 100644
index 00000000..e4463ef5
--- /dev/null
+++ b/include/iprt/alloca.h
@@ -0,0 +1,63 @@
+/** @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 */
+