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 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright 2014 Garrett D'Amore <garrett@damore.org> 28 * 29 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 30 * Use is subject to license terms. 31 */ 32 33 #ifndef _SYS_VA_IMPL_H 34 #define _SYS_VA_IMPL_H 35 36 /* 37 * An application should not include this header directly. Instead it 38 * should be included only through the inclusion of other Sun headers, 39 * specifically <stdarg.h> and <varargs.h>. 40 * 41 * This header serves two purposes. 42 * 43 * First, it provides a common set of definitions that implementations 44 * of the various standards for variable argument lists may use. These 45 * various standards are implemented in <varargs.h>, <stdarg.h>, 46 * <iso/stdarg_iso.h>, <iso/stdarg_c99.h>, and <sys/varargs.h>. 47 * 48 * Second, it provides varying implementations of the common definitions, 49 * depending upon the compiler. 50 */ 51 52 /* 53 * The common definitions exported by this header or compilers using 54 * this header are: 55 * 56 * the macro __va_start(list, name) starting the list iteration 57 * the macro __va_arg(list, type) getting the current arg and iterating 58 * the macro __va_copy(to, from) to bookmark the list iteration 59 * the macro __va_end(list) to end the iteration 60 * 61 * In addition, the following are exported via inclusion of <sys/va_list.h>: 62 * 63 * the identifier __builtin_va_alist for the variable list pseudo parameter 64 * the type __va_alist_type for the variable list pseudo parameter 65 * the type __va_list defining the type of the variable list iterator 66 */ 67 68 /* 69 * This header uses feature macros (e.g. __BUILTIN_VA_ARG_INCR and 70 * __BUILTIN_VA_STRUCT), compiler macros (e.g. __GNUC__), and processor 71 * macros (e.g. __sparc) to determine the protocol appropriate to the 72 * current compilation. It is intended that the compilation system 73 * define the feature, processor, and compiler macros, not the user of 74 * the system. 75 */ 76 77 /* 78 * Many compilation systems depend upon the use of special functions 79 * built into the the compilation system to handle variable argument 80 * lists. These built-in symbols may include one or more of the 81 * following: 82 * 83 * __builtin_va_alist 84 * __builtin_va_start 85 * __builtin_va_arg_incr 86 * __builtin_stdarg_start 87 * __builtin_va_end 88 * __builtin_va_arg 89 * __builtin_va_copy 90 */ 91 92 /* 93 * The following are defined in <sys/va_list.h>: 94 * 95 * __va_alist_type 96 * __va_void() 97 * __va_ptr_base 98 * ISA definitions via inclusion of <sys/isa_defs.h> 99 * 100 * Inclusion of this header also makes visible the symbols in <sys/va_list.h>. 101 * This header is included in <varargs.h>, <sys/varargs.h> and in <stdarg.h> 102 * via inclusion of <iso/stdarg_iso.h>. 103 */ 104 105 #include <sys/va_list.h> 106 107 #ifdef __cplusplus 108 extern "C" { 109 #endif 110 111 #if defined(__lint) /* ---------------------------------------- protocol */ 112 113 #define __va_start(list, name) ((list) = (__va_list)&name) 114 #define __va_arg(list, type) ((type *)(list))[0] 115 #define __va_copy(to, from) __va_void(((to) = (from))) 116 /*ARGSUSED*/ 117 static void __va_end(__va_list list) { __va_end(list); } 118 119 #elif defined(__BUILTIN_VA_STRUCT) /* ------------------------ protocol */ 120 121 /* ISA __va_list structures defined in <sys/va_list.h> */ 122 123 void __builtin_va_start(__va_list, ...); 124 void *__builtin_va_arg_incr(__va_list, ...); 125 126 #define __va_start(list, name) __builtin_va_start(list, 0) 127 #define __va_arg(list, type) \ 128 ((type *)__builtin_va_arg_incr(list, (type *)0))[0] 129 #define __va_copy(to, from) __va_void(((to)[0] = (from)[0])) 130 #define __va_end(list) __va_void(0) 131 132 #elif defined(__BUILTIN_VA_ARG_INCR) /* ------------------------ protocol */ 133 134 #define __va_start(list, name) \ 135 __va_void(((list) = (__va_list)&__builtin_va_alist)) 136 #define __va_arg(list, type) \ 137 ((type *)__builtin_va_arg_incr((type *)(list)))[0] 138 #define __va_copy(to, from) __va_void(((to) = (from))) 139 #define __va_end(list) __va_void(0) 140 141 #elif defined(__GNUC__) && ((__GNUC__ == 2 && __GNUC_MINOR__ >= 96) || \ 142 (__GNUC__ >= 3)) /* ------------------------ protocol */ 143 #if (__GNUC__ < 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ < 3)) 144 #define __va_start(list, name) __builtin_stdarg_start(list, name) 145 #else 146 #define __va_start(list, name) __builtin_va_start(list, name) 147 #endif 148 149 #define __va_arg(list, type) __builtin_va_arg(list, type) 150 #define __va_end(list) __builtin_va_end(list) 151 #define __va_copy(to, from) __builtin_va_copy(to, from) 152 153 #else /* ----------------------- protocol */ 154 155 /* 156 * Because we can not predict the compiler protocol for unknown compilers, we 157 * force an error in order to avoid unpredictable behavior. For versions of 158 * gcc 2.95 and earlier, variable argument lists are handled in gcc specific 159 * stdarg.h and varargs.h headers created via the gcc fixincl utility. In 160 * those cases, the gcc headers would override this header. 161 */ 162 163 #error("Unrecognized compiler protocol for variable argument lists") 164 165 #endif /* -------------------------------------------------------- protocol */ 166 167 #ifdef __cplusplus 168 } 169 #endif 170 171 #endif /* _SYS_VA_IMPL_H */ 172