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/*
* Copyright (C) 2014-2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 VMHeap_h
#define VMHeap_h
#include "Chunk.h"
#include "FixedVector.h"
#include "Map.h"
#include "Vector.h"
#include "XLargeRange.h"
#if BOS(DARWIN)
#include "Zone.h"
#endif
namespace bmalloc {
class BeginTag;
class EndTag;
class Heap;
class VMHeap {
public:
SmallPage* allocateSmallPage(std::lock_guard<StaticMutex>&, size_t);
void deallocateSmallPage(std::unique_lock<StaticMutex>&, size_t, SmallPage*);
XLargeRange tryAllocateLargeChunk(std::lock_guard<StaticMutex>&, size_t alignment, size_t);
private:
void allocateSmallChunk(std::lock_guard<StaticMutex>&, size_t);
std::array<List<SmallPage>, pageClassCount> m_smallPages;
#if BOS(DARWIN)
Zone m_zone;
#endif
};
inline SmallPage* VMHeap::allocateSmallPage(std::lock_guard<StaticMutex>& lock, size_t pageClass)
{
if (m_smallPages[pageClass].isEmpty())
allocateSmallChunk(lock, pageClass);
SmallPage* page = m_smallPages[pageClass].pop();
vmAllocatePhysicalPagesSloppy(page->begin()->begin(), pageSize(pageClass));
return page;
}
inline void VMHeap::deallocateSmallPage(std::unique_lock<StaticMutex>& lock, size_t pageClass, SmallPage* page)
{
lock.unlock();
vmDeallocatePhysicalPagesSloppy(page->begin()->begin(), pageSize(pageClass));
lock.lock();
m_smallPages[pageClass].push(page);
}
} // namespace bmalloc
#endif // VMHeap_h
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