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 * @(#)stdarg.h 8.1 (Berkeley) 06/11/93 17 * 18 * from: $Header: stdarg.h,v 1.8 93/05/07 18:10:14 torek Exp $ 19 */ 20 21 /* 22 * SPARC stdarg.h 23 */ 24 25 #ifndef _MACHINE_STDARG_H 26 #define _MACHINE_STDARG_H 27 28 typedef char *va_list; 29 30 /* 31 * va_start sets ap to point to the first variable argument. 32 * The `last fixed argument' parameter l is ignored (and should 33 * never have been included in the ANSI standard!). 34 * 35 * va_end cleans up after va_start. There is nothing to do there. 36 */ 37 #define va_start(ap, l) (__builtin_saveregs(), \ 38 ap = (char *)__builtin_next_arg()) 39 #define va_end(ap) /* empty */ 40 41 #if __GNUC__ == 1 42 #define __extension__ /* hack for bootstrapping via gcc 1.x */ 43 #endif 44 45 /* 46 * va_arg picks up the next argument of type `ty'. Appending an 47 * asterisk to ty must produce a pointer to ty (i.e., ty may not be, 48 * e.g., `int (*)()'). In addition, ty must not be any type which 49 * undergoes promotion to some other type (e.g., char): it must 50 * be the promoted type instead. 51 * 52 * Gcc-2.x tries to use ldd/std for double and quad_t values, but Sun's 53 * brain-damaged calling convention does not quad-align these. Thus, 54 * for 8-byte arguments, we have to pick up the actual value four bytes 55 * at a time, and use type punning (i.e., a union) to produce the result. 56 * (We could also do this with a libc function, actually, by returning 57 * 8 byte integers in %o0+%o1 and the same 8 bytes as a double in %f0+%f1.) 58 * 59 * Note: we cannot use the union trick (which generates better code) for 60 * C++, since `ty' might be a type with a constructor (these may not appear 61 * in a union). 62 * 63 * The extraneous casts through `void *' avoid gcc alignment warnings. 64 */ 65 #ifdef __cplusplus 66 #define __va_8byte(ap, ty) ({ \ 67 int __va_i[2]; \ 68 __va_i[0] = ((int *)(void *)(ap))[0]; \ 69 __va_i[1] = ((int *)(void *)(ap))[1]; \ 70 (ap) += 8; *(ty *)(void *)__va_i; }) 71 #else 72 #define __va_8byte(ap, ty) ({ \ 73 union { ty __d; int __i[2]; } __va_u; \ 74 __va_u.__i[0] = ((int *)(void *)(ap))[0]; \ 75 __va_u.__i[1] = ((int *)(void *)(ap))[1]; \ 76 (ap) += 8; __va_u.__d; }) 77 #endif /* __cplusplus */ 78 79 #define va_arg(ap, ty) __extension__ ({ \ 80 ty __va_temp; /* to check for invisible-ptr struct-valued args */ \ 81 __builtin_classify_type(__va_temp) >= 12 ? \ 82 ((ty **)(void *)((ap) += sizeof(ty *)))[-1][0] : \ 83 sizeof(ty) == 8 ? __va_8byte(ap, ty) : \ 84 ((ty *)(void *)(ap += sizeof(ty)))[-1]; }) 85 86 #endif /* _MACHINE_STDARG_H */ 87