common.hpp

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/*
 * Copyright 2016-2019, Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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.
 *
 *     * Neither the name of the copyright holder 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 COPYRIGHT HOLDERS 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 COPYRIGHT
 * OWNER 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 LIBPMEMOBJ_CPP_COMMON_HPP
#define LIBPMEMOBJ_CPP_COMMON_HPP

#include <libpmemobj++/detail/pexceptions.hpp>
#include <libpmemobj/tx_base.h>
#include <typeinfo>

#if defined(__GNUC__) || defined(__clang__)
#define POBJ_CPP_DEPRECATED __attribute__((deprecated))
#elif defined(_MSC_VER)
#define POBJ_CPP_DEPRECATED __declspec(deprecated)
#else
#define POBJ_CPP_DEPRECATED
#endif

/*
 * Workaround for missing "is_trivially_copyable" in gcc < 5.0.
 * Be aware of a difference between __has_trivial_copy and is_trivially_copyable
 * e.g. for deleted copy constructors __has_trivial_copy(A) returns 1 in clang
 * and 0 in gcc. It means that for gcc < 5 IS_TRIVIALLY_COPYABLE is more
 * restrictive than is_trivially_copyable.
 */
#if !defined(__clang__) && defined(__GNUG__) && __GNUC__ < 5
#define IS_TRIVIALLY_COPYABLE(T) __has_trivial_copy(T)
#else
#define IS_TRIVIALLY_COPYABLE(T) std::is_trivially_copyable<T>::value
#endif

namespace pmem
{

namespace obj
{
template <typename T>
class persistent_ptr;
}

namespace detail
{

/*
 * Conditionally add 'count' objects to a transaction.
 *
 * Adds count objects starting from `that` to the transaction if '*that' is
 * within a pmemobj pool and there is an active transaction.
 * Does nothing otherwise.
 *
 * @param[in] that pointer to the first object being added to the transaction.
 * @param[in] count number of elements to be added to the transaction.
 */
template <typename T>
inline void
conditional_add_to_tx(const T *that, std::size_t count = 1)
{
    if (count == 0)
        return;

    if (pmemobj_tx_stage() != TX_STAGE_WORK)
        return;

    /* 'that' is not in any open pool */
    if (!pmemobj_pool_by_ptr(that))
        return;

    if (pmemobj_tx_add_range_direct(that, sizeof(*that) * count))
        throw transaction_error(
            "Could not add object(s) to the transaction.");
}

/*
 * Return type number for given type.
 */
template <typename T>
uint64_t
type_num()
{
    return typeid(T).hash_code();
}

inline uint64_t
next_pow_2(uint64_t v)
{
    v--;
    v |= v >> 1;
    v |= v >> 2;
    v |= v >> 4;
    v |= v >> 8;
    v |= v >> 16;
    v |= v >> 32;
    ++v;
    return v + (v == 0);
}

inline uint64_t
next_pow_2(uint32_t v)
{
    v--;
    v |= v >> 1;
    v |= v >> 2;
    v |= v >> 4;
    v |= v >> 8;
    v |= v >> 16;
    ++v;
    return v + (v == 0);
}

} /* namespace detail */

} /* namespace pmem */

#endif /* LIBPMEMOBJ_CPP_COMMON_HPP */