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      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
     35 extern "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__
     60 extern void *__builtin_alloca(size_t);
     61 #else
     62 extern void *__builtin_alloca();
     63 #endif
     64 
     65 #else
     66 
     67 #ifdef	__STDC__
     68 extern void *alloca(size_t);
     69 #else
     70 extern 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