1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#ifndef	_ALLOCA_H
28#define	_ALLOCA_H
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#include <sys/types.h>
33
34#ifdef __cplusplus
35extern "C" {
36#endif
37
38/*
39 * Many compilation systems depend upon the use of special functions
40 * built into the the compilation system to handle variable argument
41 * lists and stack allocations.  The method to obtain this in SunOS
42 * is to define the feature test macro "__BUILTIN_VA_ARG_INCR" which
43 * enables the following special built-in functions:
44 *	__builtin_alloca
45 *	__builtin_va_alist
46 *	__builtin_va_arg_incr
47 * It is intended that the compilation system define this feature test
48 * macro, not the user of the system.
49 *
50 * The tests on the processor type are to provide a transitional period
51 * for existing compilation systems, and may be removed in a future
52 * release.
53 */
54
55#if defined(__BUILTIN_VA_ARG_INCR) || \
56	defined(__sparc) || defined(__i386) || defined(__amd64)
57#define	alloca(x)	__builtin_alloca(x)
58
59#ifdef	__STDC__
60extern void *__builtin_alloca(size_t);
61#else
62extern void *__builtin_alloca();
63#endif
64
65#else
66
67#ifdef	__STDC__
68extern void *alloca(size_t);
69#else
70extern void *alloca();
71#endif
72
73#endif	/* defined(__BUILTIN_VA_ARG_INCR) || defined(__sparc) ... */
74
75#ifdef __cplusplus
76}
77#endif
78
79#endif	/* _ALLOCA_H */
80