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/*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*
* Copyright (c) 2009 Helge Bahmann
* Copyright (c) 2012 Tim Blechmann
* Copyright (c) 2013 - 2014 Andrey Semashev
*/
/*!
* \file atomic/detail/storage_type.hpp
*
* This header defines underlying types used as storage
*/
#ifndef BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
#define BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
#include <cstddef>
#include <boost/cstdint.hpp>
#include <boost/atomic/detail/config.hpp>
#include <boost/atomic/detail/string_ops.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
namespace atomics {
namespace detail {
template< typename T >
BOOST_FORCEINLINE void non_atomic_load(T const volatile& from, T& to) BOOST_NOEXCEPT
{
to = from;
}
template< std::size_t Size >
struct BOOST_ATOMIC_DETAIL_MAY_ALIAS buffer_storage
{
BOOST_ALIGNMENT(16) unsigned char data[Size];
BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT
{
return (data[0] == 0u && BOOST_ATOMIC_DETAIL_MEMCMP(data, data + 1, Size - 1) == 0);
}
BOOST_FORCEINLINE bool operator== (buffer_storage const& that) const BOOST_NOEXCEPT
{
return BOOST_ATOMIC_DETAIL_MEMCMP(data, that.data, Size) == 0;
}
BOOST_FORCEINLINE bool operator!= (buffer_storage const& that) const BOOST_NOEXCEPT
{
return BOOST_ATOMIC_DETAIL_MEMCMP(data, that.data, Size) != 0;
}
};
template< std::size_t Size >
BOOST_FORCEINLINE void non_atomic_load(buffer_storage< Size > const volatile& from, buffer_storage< Size >& to) BOOST_NOEXCEPT
{
BOOST_ATOMIC_DETAIL_MEMCPY(to.data, const_cast< unsigned char const* >(from.data), Size);
}
template< std::size_t Size >
struct make_storage_type
{
typedef buffer_storage< Size > type;
struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
{
type value;
BOOST_DEFAULTED_FUNCTION(aligned(), {})
BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type const& v) BOOST_NOEXCEPT : value(v) {}
};
};
template< >
struct make_storage_type< 1u >
{
typedef boost::uint8_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
{
type value;
BOOST_DEFAULTED_FUNCTION(aligned(), {})
BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
};
};
template< >
struct make_storage_type< 2u >
{
typedef boost::uint16_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
{
BOOST_ALIGNMENT(2) type value;
BOOST_DEFAULTED_FUNCTION(aligned(), {})
BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
};
};
template< >
struct make_storage_type< 4u >
{
typedef boost::uint32_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
{
BOOST_ALIGNMENT(4) type value;
BOOST_DEFAULTED_FUNCTION(aligned(), {})
BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
};
};
template< >
struct make_storage_type< 8u >
{
typedef boost::uint64_t BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
{
BOOST_ALIGNMENT(8) type value;
BOOST_DEFAULTED_FUNCTION(aligned(), {})
BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
};
};
#if defined(BOOST_HAS_INT128)
template< >
struct make_storage_type< 16u >
{
typedef boost::uint128_type BOOST_ATOMIC_DETAIL_MAY_ALIAS type;
struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
{
BOOST_ALIGNMENT(16) type value;
BOOST_DEFAULTED_FUNCTION(aligned(), {})
BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
};
};
#elif !defined(BOOST_NO_ALIGNMENT)
struct BOOST_ATOMIC_DETAIL_MAY_ALIAS storage128_t
{
typedef boost::uint64_t BOOST_ATOMIC_DETAIL_MAY_ALIAS element_type;
element_type data[2];
BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT
{
return (data[0] | data[1]) == 0u;
}
};
BOOST_FORCEINLINE bool operator== (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT
{
return ((left.data[0] ^ right.data[0]) | (left.data[1] ^ right.data[1])) == 0u;
}
BOOST_FORCEINLINE bool operator!= (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT
{
return !(left == right);
}
BOOST_FORCEINLINE void non_atomic_load(storage128_t const volatile& from, storage128_t& to) BOOST_NOEXCEPT
{
to.data[0] = from.data[0];
to.data[1] = from.data[1];
}
template< >
struct make_storage_type< 16u >
{
typedef storage128_t type;
struct BOOST_ATOMIC_DETAIL_MAY_ALIAS aligned
{
BOOST_ALIGNMENT(16) type value;
BOOST_DEFAULTED_FUNCTION(aligned(), {})
BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type const& v) BOOST_NOEXCEPT : value(v) {}
};
};
#endif
template< typename T >
struct storage_size_of
{
static BOOST_CONSTEXPR_OR_CONST std::size_t size = sizeof(T);
static BOOST_CONSTEXPR_OR_CONST std::size_t value = (size == 3u ? 4u : (size >= 5u && size <= 7u ? 8u : (size >= 9u && size <= 15u ? 16u : size)));
};
} // namespace detail
} // namespace atomics
} // namespace boost
#endif // BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
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