Annotation of sys/arch/sparc/include/stdarg.h, Revision 1.1.1.1
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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