Annotation of sys/arch/sparc/include/stdarg.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: stdarg.h,v 1.13 2006/04/09 03:07:53 deraadt Exp $ */
! 2: /* $NetBSD: stdarg.h,v 1.10 1996/12/27 20:55:28 pk Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1992, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * This software was developed by the Computer Systems Engineering group
! 9: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 10: * contributed to Berkeley.
! 11: *
! 12: * All advertising materials mentioning features or use of this software
! 13: * must display the following acknowledgement:
! 14: * This product includes software developed by the University of
! 15: * California, Lawrence Berkeley Laboratory.
! 16: *
! 17: * Redistribution and use in source and binary forms, with or without
! 18: * modification, are permitted provided that the following conditions
! 19: * are met:
! 20: * 1. Redistributions of source code must retain the above copyright
! 21: * notice, this list of conditions and the following disclaimer.
! 22: * 2. Redistributions in binary form must reproduce the above copyright
! 23: * notice, this list of conditions and the following disclaimer in the
! 24: * documentation and/or other materials provided with the distribution.
! 25: * 3. Neither the name of the University nor the names of its contributors
! 26: * may be used to endorse or promote products derived from this software
! 27: * without specific prior written permission.
! 28: *
! 29: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 30: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 31: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 32: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 33: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 34: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 35: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 36: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 37: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 38: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 39: * SUCH DAMAGE.
! 40: *
! 41: * from: @(#)stdarg.h 8.2 (Berkeley) 9/27/93
! 42: */
! 43:
! 44: #ifndef _SPARC_STDARG_H_
! 45: #define _SPARC_STDARG_H_
! 46:
! 47: #include <sys/cdefs.h>
! 48: #include <machine/_types.h>
! 49:
! 50: #ifdef __lint__
! 51: #define __builtin_classify_type(t) (0)
! 52: #endif
! 53:
! 54: typedef __va_list va_list;
! 55:
! 56: #define __va_size(type) \
! 57: (((sizeof(type) + sizeof(long) - 1) / sizeof(long)) * sizeof(long))
! 58:
! 59: #ifdef lint
! 60: #define va_start(ap,lastarg) ((ap) = (ap))
! 61: #else
! 62: #define va_start(ap, last) \
! 63: (__builtin_next_arg(last), (ap) = (va_list)__builtin_saveregs())
! 64: #endif /* lint */
! 65:
! 66: /*
! 67: * va_arg picks up the next argument of type `type'. Appending an
! 68: * asterisk to `type' must produce a pointer to `type' (i.e., `type'
! 69: * may not be, e.g., `int (*)()').
! 70: *
! 71: * Gcc-2.x tries to use ldd/std for double and quad_t values, but Sun's
! 72: * brain-damaged calling convention does not quad-align these. Thus, for
! 73: * 8-byte arguments, we have to pick up the actual value four bytes at a
! 74: * time, and use type punning (i.e., a union) to produce the result.
! 75: * (We could also do this with a libc function, actually, by returning
! 76: * 8 byte integers in %o0+%o1 and the same 8 bytes as a double in %f0+%f1.)
! 77: *
! 78: * Note: We don't declare __d with type `type', since in C++ the type might
! 79: * have a constructor.
! 80: */
! 81: #define __va_8byte(ap, type) \
! 82: __statement({ \
! 83: union { char __d[sizeof(type)]; int __i[2]; } __va_u; \
! 84: __va_u.__i[0] = ((int *)(void *)(ap))[0]; \
! 85: __va_u.__i[1] = ((int *)(void *)(ap))[1]; \
! 86: (ap) += 8; *(type *)(va_list)__va_u.__d; \
! 87: })
! 88:
! 89: #define __va_arg(ap, type) \
! 90: (*(type *)((ap) += __va_size(type), \
! 91: (ap) - (sizeof(type) < sizeof(long) && \
! 92: sizeof(type) != __va_size(type) ? \
! 93: sizeof(type) : __va_size(type))))
! 94:
! 95: #define __RECORD_TYPE_CLASS 12
! 96: #define va_arg(ap, type) \
! 97: (__builtin_classify_type(*(type *)0) >= __RECORD_TYPE_CLASS ? \
! 98: *__va_arg(ap, type *) : __va_size(type) == 8 ? \
! 99: __va_8byte(ap, type) : __va_arg(ap, type))
! 100:
! 101: #if __ISO_C_VISIBLE >= 1999
! 102: #define va_copy(dest, src) \
! 103: ((dest) = (src))
! 104: #endif
! 105:
! 106: #define va_end(ap)
! 107:
! 108: #endif /* !_SPARC_STDARG_H_ */
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