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