mirror of
https://github.com/darlinghq/darling-bmalloc.git
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61 lines
2.3 KiB
C++
61 lines
2.3 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "BMalloced.h"
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#include "IsoDirectory.h"
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namespace bmalloc {
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template<typename Config>
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class IsoDirectoryPage {
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MAKE_BMALLOCED;
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public:
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// By my math, this results in an IsoDirectoryPage using 4036 bytes on 64-bit platforms. We allocate it
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// with malloc, so it doesn't really matter how much memory it uses. But it's nice that this about a
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// page, since that's quite intuitive.
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//
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// On 32-bit platforms, I think that this will be 2112 bytes. That's still quite intuitive.
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//
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// Note that this is a multiple of 32 so that it uses bitvectors efficiently.
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static constexpr unsigned numPages = 480;
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IsoDirectoryPage(IsoHeapImpl<Config>&, unsigned index);
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static IsoDirectoryPage* pageFor(IsoDirectory<Config, numPages>* payload);
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unsigned index() const { return m_index; }
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IsoDirectory<Config, numPages> payload;
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IsoDirectoryPage* next { nullptr };
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private:
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unsigned m_index;
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};
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} // namespace bmalloc
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