1 /* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * All advertising materials mentioning features or use of this software 10 * must display the following acknowledgement: 11 * This product includes software developed by the University of 12 * California, Lawrence Berkeley Laboratory. 13 * 14 * %sccs.include.redist.c% 15 * 16 * @(#)varargs.h 8.2 (Berkeley) 09/27/93 17 * 18 * from: $Header: varargs.h,v 1.8 93/09/27 00:53:20 torek Exp $ 19 */ 20 21 #ifndef _MACHINE_VARARGS_H_ 22 #define _MACHINE_VARARGS_H_ 23 24 typedef char *va_list; 25 26 /* See <machine/stdarg.h> for comments. */ 27 #if __GNUC__ == 1 28 #define __extension__ 29 #define va_dcl int va_alist; 30 #else /* gcc2 */ 31 #ifdef __GCC_NEW_VARARGS__ /* gcc 2.4.5 */ 32 #define va_alist __builtin_va_alist 33 #define va_dcl int __builtin_va_alist; 34 #else /* gcc 2.3.3 */ 35 #define va_dcl int va_alist; ... 36 #endif 37 #endif 38 39 #ifdef __GCC_NEW_VARARGS__ 40 #define va_start(ap) ((ap) = (char *)__builtin_saveregs()) 41 #else 42 #define va_start(ap) (__builtin_saveregs(), (ap) = (char *)&va_alist) 43 #endif 44 #define va_end(ap) /* empty */ 45 46 /* Note, we can assume C code here; C++ does not use <varargs.h>. */ 47 #define __va_8byte(ap, ty) ({ \ 48 union { ty __d; int __i[2]; } __va_u; \ 49 __va_u.__i[0] = ((int *)(void *)(ap))[0]; \ 50 __va_u.__i[1] = ((int *)(void *)(ap))[1]; \ 51 (ap) += 8; __va_u.__d; }) 52 #define va_arg(ap, ty) __extension__ ({ \ 53 ty __va_temp; \ 54 __builtin_classify_type(__va_temp) >= 12 ? \ 55 ((ty **)(void *)((ap) += sizeof(ty *)))[-1][0] : \ 56 sizeof(ty) == 8 ? __va_8byte(ap, ty) : \ 57 ((ty *)(void *)(ap += sizeof(ty)))[-1]; }) 58 59 #endif /* !_MACHINE_VARARGS_H_ */ 60