libc/newlib/libc/include/sys/cdefs.h

/* libc/sys/linux/sys/cdefs.h - Helper macros for K&R vs. ANSI C compat. */

/* Written 2000 by Werner Almesberger */

/*
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Berkeley Software Design, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)cdefs.h	8.8 (Berkeley) 1/9/95
 * $FreeBSD: src/sys/sys/cdefs.h,v 1.54 2002/05/11 03:58:24 alfred Exp $
 */

#ifndef _SYS_CDEFS_H
#define _SYS_CDEFS_H

#include <sys/features.h>
#include <stddef.h>
#include <stdint.h>

#define __FBSDID(x) /* nothing */
/*
 * Note: the goal here is not compatibility to K&R C. Since we know that we
 * have GCC which understands ANSI C perfectly well, we make use of this.
 */

#define __P(args)	args
#define __PMT(args)	args
#define __const		const
#define __signed	signed
#define __volatile	volatile
#define __DOTS    	, ...
#define __THROW

/*
 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
 * mode -- there must be no spaces between its arguments, and for nested
 * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
 * concatenate double-quoted strings produced by the __STRING macro, but
 * this only works with ANSI C.
 *
 * __XSTRING is like __STRING, but it expands any macros in its argument
 * first.  It is only available with ANSI C.
 */
#define __CONCAT1(x,y)  x ## y
#define __CONCAT(x,y)   __CONCAT1(x,y)
#define __STRING(x)     #x              /* stringify without expanding x */
#define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */

#ifdef __GNUC__
# define __ASMNAME(cname)  __XSTRING (__USER_LABEL_PREFIX__) cname
#endif

#define __ptr_t void *
#define __long_double_t  long double

#define __attribute_malloc__
#define __attribute_pure__
#define __attribute_format_strfmon__(a,b)
#define __flexarr      [0]

#ifdef  __cplusplus
# define __BEGIN_DECLS  extern "C" {
# define __END_DECLS    }
#else
# define __BEGIN_DECLS
# define __END_DECLS
#endif

#ifndef __BOUNDED_POINTERS__
# define __bounded      /* nothing */
# define __unbounded    /* nothing */
# define __ptrvalue     /* nothing */
#endif

/*
 * Given the pointer x to the member m of the struct s, return
 * a pointer to the containing structure.  When using GCC, we first
 * assign pointer x to a local variable, to check that its type is
 * compatible with member m.
 */
#if __GNUC_PREREQ(3, 1)
#define	__containerof(x, s, m) ({					\
	const volatile __typeof__(((s *)0)->m) *__x = (x);		\
	__DEQUALIFY(s *, (const volatile char *)__x - offsetof(s, m));\
})
#else
#define	__containerof(x, s, m)						\
	__DEQUALIFY(s *, (const volatile char *)(x) - offsetof(s, m))
#endif

#ifndef	__DEQUALIFY
#define	__DEQUALIFY(type, var)	((type)(uintptr_t)(const volatile void *)(var))
#endif

#ifdef __GNUC__
#define	__strong_reference(sym,aliassym)	\
	extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
#ifdef __ELF__
#ifdef __STDC__
#define	__weak_reference(sym,alias)	\
	__asm__(".weak " #alias);	\
	__asm__(".equ "  #alias ", " #sym)
#define	__warn_references(sym,msg)	\
	__asm__(".section .gnu.warning." #sym);	\
	__asm__(".asciz \"" msg "\"");	\
	__asm__(".previous")
#else
#define	__weak_reference(sym,alias)	\
	__asm__(".weak alias");		\
	__asm__(".equ alias, sym")
#define	__warn_references(sym,msg)	\
	__asm__(".section .gnu.warning.sym"); \
	__asm__(".asciz \"msg\"");	\
	__asm__(".previous")
#endif	/* __STDC__ */
#else	/* !__ELF__ */
#ifdef __STDC__
#define	__weak_reference(sym,alias)	\
	__asm__(".stabs \"_" #alias "\",11,0,0,0");	\
	__asm__(".stabs \"_" #sym "\",1,0,0,0")
#define	__warn_references(sym,msg)	\
	__asm__(".stabs \"" msg "\",30,0,0,0");		\
	__asm__(".stabs \"_" #sym "\",1,0,0,0")
#else
#define	__weak_reference(sym,alias)	\
	__asm__(".stabs \"_/**/alias\",11,0,0,0");	\
	__asm__(".stabs \"_/**/sym\",1,0,0,0")
#define	__warn_references(sym,msg)	\
	__asm__(".stabs msg,30,0,0,0");			\
	__asm__(".stabs \"_/**/sym\",1,0,0,0")
#endif	/* __STDC__ */
#endif	/* __ELF__ */
#endif	/* __GNUC__ */

#endif /* _SYS_CDEFS_H */