155126Storek /* 255126Storek * Copyright (c) 1992 The Regents of the University of California. 355126Storek * All rights reserved. 455126Storek * 555126Storek * This software was developed by the Computer Systems Engineering group 655126Storek * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 755126Storek * contributed to Berkeley. 855126Storek * 955501Sbostic * All advertising materials mentioning features or use of this software 1055501Sbostic * must display the following acknowledgement: 1155501Sbostic * This product includes software developed by the University of 1259210Storek * California, Lawrence Berkeley Laboratory. 1355501Sbostic * 1455126Storek * %sccs.include.redist.c% 1555126Storek * 16*59792Storek * @(#)stdarg.h 7.5 (Berkeley) 05/07/93 1755126Storek * 18*59792Storek * from: $Header: stdarg.h,v 1.8 93/05/07 18:10:14 torek Exp $ 1955126Storek */ 2055126Storek 2155126Storek /* 2255126Storek * SPARC stdarg.h 2355126Storek */ 2455126Storek 2555126Storek #ifndef _MACHINE_STDARG_H 2655126Storek #define _MACHINE_STDARG_H 2755126Storek 2855126Storek typedef char *va_list; 2955126Storek 3055126Storek /* 3155126Storek * va_start sets ap to point to the first variable argument. 3255126Storek * The `last fixed argument' parameter l is ignored (and should 3355126Storek * never have been included in the ANSI standard!). 3455126Storek * 3555126Storek * va_end cleans up after va_start. There is nothing to do there. 3655126Storek */ 3755126Storek #define va_start(ap, l) (__builtin_saveregs(), \ 3855126Storek ap = (char *)__builtin_next_arg()) 3955126Storek #define va_end(ap) /* empty */ 4055126Storek 4156566Storek #if __GNUC__ == 1 4256566Storek #define __extension__ /* hack for bootstrapping via gcc 1.x */ 4356566Storek #endif 4456566Storek 4555126Storek /* 4656566Storek * va_arg picks up the next argument of type `ty'. Appending an 4756566Storek * asterisk to ty must produce a pointer to ty (i.e., ty may not be, 4856566Storek * e.g., `int (*)()'). In addition, ty must not be any type which 4955126Storek * undergoes promotion to some other type (e.g., char): it must 5055126Storek * be the promoted type instead. 5156566Storek * 5256566Storek * Gcc-2.x tries to use ldd/std for double and quad_t values, but Sun's 5356566Storek * brain-damaged calling convention does not quad-align these. Thus, 5456566Storek * for 8-byte arguments, we have to pick up the actual value four bytes 5556566Storek * at a time, and use type punning (i.e., a union) to produce the result. 5656566Storek * (We could also do this with a libc function, actually, by returning 5756566Storek * 8 byte integers in %o0+%o1 and the same 8 bytes as a double in %f0+%f1.) 58*59792Storek * 59*59792Storek * Note: we cannot use the union trick (which generates better code) for 60*59792Storek * C++, since `ty' might be a type with a constructor (these may not appear 61*59792Storek * in a union). 62*59792Storek * 63*59792Storek * The extraneous casts through `void *' avoid gcc alignment warnings. 6455126Storek */ 65*59792Storek #ifdef __cplusplus 66*59792Storek #define __va_8byte(ap, ty) ({ \ 67*59792Storek int __va_i[2]; \ 68*59792Storek __va_i[0] = ((int *)(void *)(ap))[0]; \ 69*59792Storek __va_i[1] = ((int *)(void *)(ap))[1]; \ 70*59792Storek (ap) += 8; *(ty *)(void *)__va_i; }) 71*59792Storek #else 72*59792Storek #define __va_8byte(ap, ty) ({ \ 73*59792Storek union { ty __d; int __i[2]; } __va_u; \ 74*59792Storek __va_u.__i[0] = ((int *)(void *)(ap))[0]; \ 75*59792Storek __va_u.__i[1] = ((int *)(void *)(ap))[1]; \ 76*59792Storek (ap) += 8; __va_u.__d; }) 77*59792Storek #endif /* __cplusplus */ 7855126Storek 79*59792Storek #define va_arg(ap, ty) __extension__ ({ \ 80*59792Storek ty __va_temp; /* to check for invisible-ptr struct-valued args */ \ 81*59792Storek __builtin_classify_type(__va_temp) >= 12 ? \ 82*59792Storek ((ty **)(void *)((ap) += sizeof(ty *)))[-1][0] : \ 83*59792Storek sizeof(ty) == 8 ? __va_8byte(ap, ty) : \ 84*59792Storek ((ty *)(void *)(ap += sizeof(ty)))[-1]; }) 85*59792Storek 8655126Storek #endif /* _MACHINE_STDARG_H */ 87