source: rtems-libbsd/freebsd/sys/contrib/ck/include/ck_cc.h @ 3489e3b

/*
 * Copyright 2009-2015 Samy Al Bahra.
 * Copyright 2014 Paul Khuong.
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

#ifndef CK_CC_H
#define CK_CC_H

#if defined(__GNUC__) || defined(__SUNPRO_C)
#include "gcc/ck_cc.h"
#endif

#ifndef CK_CC_RESTRICT
#define CK_CC_RESTRICT
#endif

#ifndef CK_CC_INLINE
#define CK_CC_INLINE inline
#endif

#ifndef CK_CC_FORCE_INLINE
#define CK_CC_FORCE_INLINE inline
#endif

#define CK_CC_DECONST_PTR(X) ((void *)(uintptr_t)(X))

/*
 * Container function.
 * This relies on (compiler) implementation-defined behavior.
 */
#define CK_CC_CONTAINER(F, T, M, N)                                             \
        CK_CC_INLINE static T *                                                 \
        N(F *p)                                                                 \
        {                                                                       \
                F *n = p;                                                       \
                return (T *)(void *)(((char *)n) - ((size_t)&((T *)0)->M));     \
        }

#define CK_CC_PAD(x) union { char pad[x]; }

#ifndef CK_CC_ALIASED
#define CK_CC_ALIASED
#endif

#ifndef CK_CC_UNUSED
#define CK_CC_UNUSED
#endif

#ifndef CK_CC_USED
#define CK_CC_USED
#endif

#ifndef CK_CC_IMM
#define CK_CC_IMM
#endif

#ifndef CK_CC_PACKED
#define CK_CC_PACKED
#endif

#ifndef CK_CC_WEAKREF
#define CK_CC_WEAKREF
#endif

#ifndef CK_CC_ALIGN
#define CK_CC_ALIGN(X)
#endif

#ifndef CK_CC_CACHELINE
#define CK_CC_CACHELINE
#endif

#ifndef CK_CC_LIKELY
#define CK_CC_LIKELY(x) x
#endif

#ifndef CK_CC_UNLIKELY
#define CK_CC_UNLIKELY(x) x
#endif

#ifndef CK_CC_TYPEOF
#define CK_CC_TYPEOF(X, DEFAULT) (DEFAULT)
#endif

#define CK_F_CC_FFS_G(L, T)                             \
CK_CC_INLINE static int                                 \
ck_cc_##L(T v)                                          \
{                                                       \
        unsigned int i;                                 \
                                                        \
        if (v == 0)                                     \
                return 0;                               \
                                                        \
        for (i = 1; (v & 1) == 0; i++, v >>= 1);        \
        return i;                                       \
}

#ifndef CK_F_CC_FFS
#define CK_F_CC_FFS
CK_F_CC_FFS_G(ffs, unsigned int)
#endif /* CK_F_CC_FFS */

#ifndef CK_F_CC_FFSL
#define CK_F_CC_FFSL
CK_F_CC_FFS_G(ffsl, unsigned long)
#endif /* CK_F_CC_FFSL */

#ifndef CK_F_CC_FFSLL
#define CK_F_CC_FFSLL
CK_F_CC_FFS_G(ffsll, unsigned long long)
#endif /* CK_F_CC_FFSLL */

#undef CK_F_CC_FFS_G

#ifndef CK_F_CC_CTZ
#define CK_F_CC_CTZ
CK_CC_INLINE static int
ck_cc_ctz(unsigned int x)
{
        unsigned int i;

        if (x == 0)
                return 0;

        for (i = 0; (x & 1) == 0; i++, x >>= 1);
        return i;
}
#endif

#ifndef CK_F_CC_POPCOUNT
#define CK_F_CC_POPCOUNT
CK_CC_INLINE static int
ck_cc_popcount(unsigned int x)
{
        unsigned int acc;

        for (acc = 0; x != 0; x >>= 1)
                acc += x & 1;

        return acc;
}
#endif


#ifdef __cplusplus
#define CK_CPP_CAST(type, arg) static_cast<type>(arg)
#else
#define CK_CPP_CAST(type, arg) arg
#endif

#endif /* CK_CC_H */