96 lines
3.2 KiB
C++
96 lines
3.2 KiB
C++
/*
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* Copyright (C) 2014-2018 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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#ifndef SmallPage_h
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#define SmallPage_h
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#include "BAssert.h"
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#include "List.h"
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#include "Mutex.h"
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#include "VMAllocate.h"
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#include <mutex>
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namespace bmalloc {
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class SmallLine;
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class SmallPage : public ListNode<SmallPage> {
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public:
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void ref(UniqueLockHolder&);
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bool deref(UniqueLockHolder&);
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unsigned refCount(UniqueLockHolder&) { return m_refCount; }
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size_t sizeClass() { return m_sizeClass; }
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void setSizeClass(size_t sizeClass) { m_sizeClass = sizeClass; }
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bool hasFreeLines(UniqueLockHolder&) const { return m_hasFreeLines; }
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void setHasFreeLines(UniqueLockHolder&, bool hasFreeLines) { m_hasFreeLines = hasFreeLines; }
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bool hasPhysicalPages() { return m_hasPhysicalPages; }
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void setHasPhysicalPages(bool hasPhysicalPages) { m_hasPhysicalPages = hasPhysicalPages; }
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bool usedSinceLastScavenge() { return m_usedSinceLastScavenge; }
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void clearUsedSinceLastScavenge() { m_usedSinceLastScavenge = false; }
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void setUsedSinceLastScavenge() { m_usedSinceLastScavenge = true; }
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SmallLine* begin();
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unsigned char slide() const { return m_slide; }
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void setSlide(unsigned char slide) { m_slide = slide; }
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private:
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unsigned char m_hasFreeLines: 1;
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unsigned char m_hasPhysicalPages: 1;
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unsigned char m_usedSinceLastScavenge: 1;
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unsigned char m_refCount: 7;
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unsigned char m_sizeClass;
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unsigned char m_slide;
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static_assert(
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sizeClassCount <= std::numeric_limits<decltype(m_sizeClass)>::max(),
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"Largest size class must fit in SmallPage metadata");
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};
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using LineCache = std::array<List<SmallPage>, sizeClassCount>;
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inline void SmallPage::ref(UniqueLockHolder&)
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{
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BASSERT(!m_slide);
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++m_refCount;
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BASSERT(m_refCount);
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}
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inline bool SmallPage::deref(UniqueLockHolder&)
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{
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BASSERT(!m_slide);
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BASSERT(m_refCount);
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--m_refCount;
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return !m_refCount;
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}
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} // namespace bmalloc
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#endif // SmallPage_h
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