Jordan Delong
363d1bb20f
This change is mostly for FB internal organizational reasons. Building is not effected beyond the fact that the target now lands in hphp/hhvm/hhvm rather than src/hhvm/hhvm.
119 linhas
3.3 KiB
C++
119 linhas
3.3 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010- Facebook, Inc. (http://www.facebook.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#ifndef incl_HPHP_UTIL_MALLOC_SIZE_CLASS_H_
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#define incl_HPHP_UTIL_MALLOC_SIZE_CLASS_H_
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/int.hpp>
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#include "util/assertions.h"
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namespace HPHP {
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//////////////////////////////////////////////////////////////////////
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/*
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* Define two metafunctions:
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*
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* - is_malloc_size_class<Size>
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*
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* Returns true is Size is a malloc size class, or true if we
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* don't know anything about the malloc implementation and can't
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* tell.
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*
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* - next_malloc_size_class<Size>
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*
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* Returns the next size class larger than or equal to Size, or
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* returns Size if we don't know anything about this malloc.
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*/
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//////////////////////////////////////////////////////////////////////
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#ifndef USE_JEMALLOC
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template<size_t Size>
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struct is_malloc_size_class
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: boost::mpl::true_
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{};
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template<size_t Size>
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struct next_malloc_size_class
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: boost::mpl::int_<Size>
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{};
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#else
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/*
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* jemalloc-specific implementation.
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*/
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template<size_t Size>
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struct is_malloc_size_class
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: boost::mpl::bool_<
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// Small classes:
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Size == 8
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|| Size <= 128 && !(Size % 16)
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|| Size <= 256 && !(Size % 32)
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|| Size <= 512 && !(Size % 64)
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|| Size <= 1024 && !(Size % 128)
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|| Size <= 2048 && !(Size % 256)
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|| Size <= 4096 && !(Size % 512)
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// Large:
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|| Size <= 4096 * 1024 && !(Size % 4096)
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// Huge:
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|| !(Size % (4096 * 1024))
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>
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{};
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template<size_t Size>
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class next_malloc_size_class {
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template<size_t Multiple>
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struct round {
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static const size_t value =
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!(Size % Multiple) ? Size : Size + Multiple - Size % Multiple;
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};
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public:
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typedef typename boost::mpl::int_<
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// Small classes:
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Size <= 8 ? 8 :
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Size <= 16 ? 16 :
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Size <= 128 ? round< 16>::value :
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Size <= 256 ? round< 32>::value :
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Size <= 512 ? round< 64>::value :
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Size <= 1024 ? round<128>::value :
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Size <= 2048 ? round<256>::value :
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Size <= 4096 ? round<512>::value :
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// Large:
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Size <= 4096 * 1024 ? round<4096>::value :
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// Huge:
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round<4096 * 1024>::value
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>::type type;
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static const size_t value = type::value;
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static_assert(is_malloc_size_class<value>::value,
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"Bug in malloc_size_class.h");
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};
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#endif
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//////////////////////////////////////////////////////////////////////
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}
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#endif
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