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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_ */