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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 Heap_h
#define Heap_h
#include "AsyncTask.h"
#include "BumpRange.h"
#include "Environment.h"
#include "LineMetadata.h"
#include "List.h"
#include "Map.h"
#include "Mutex.h"
#include "Object.h"
#include "SmallLine.h"
#include "SmallPage.h"
#include "VMHeap.h"
#include "Vector.h"
#include "XLargeMap.h"
#include <array>
#include <mutex>
namespace bmalloc {
class BeginTag;
class BumpAllocator;
class EndTag;
class Heap {
public:
Heap(std::lock_guard<StaticMutex>&);
Environment& environment() { return m_environment; }
void allocateSmallBumpRanges(std::lock_guard<StaticMutex>&, size_t sizeClass, BumpAllocator&, BumpRangeCache&);
void derefSmallLine(std::lock_guard<StaticMutex>&, Object);
void* allocateLarge(std::lock_guard<StaticMutex>&, size_t alignment, size_t);
void* tryAllocateLarge(std::lock_guard<StaticMutex>&, size_t alignment, size_t);
void deallocateLarge(std::lock_guard<StaticMutex>&, void*);
bool isLarge(std::lock_guard<StaticMutex>&, void*);
size_t largeSize(std::lock_guard<StaticMutex>&, void*);
void shrinkLarge(std::lock_guard<StaticMutex>&, const Range&, size_t);
void scavenge(std::unique_lock<StaticMutex>&, std::chrono::milliseconds sleepDuration);
private:
struct LargeObjectHash {
static unsigned hash(void* key)
{
return static_cast<unsigned>(
reinterpret_cast<uintptr_t>(key) / smallMax);
}
};
~Heap() = delete;
void initializeLineMetadata();
void initializePageMetadata();
void allocateSmallBumpRangesByMetadata(std::lock_guard<StaticMutex>&,
size_t sizeClass, BumpAllocator&, BumpRangeCache&);
void allocateSmallBumpRangesByObject(std::lock_guard<StaticMutex>&,
size_t sizeClass, BumpAllocator&, BumpRangeCache&);
SmallPage* allocateSmallPage(std::lock_guard<StaticMutex>&, size_t sizeClass);
void deallocateSmallLine(std::lock_guard<StaticMutex>&, Object);
void mergeLarge(BeginTag*&, EndTag*&, Range&);
void mergeLargeLeft(EndTag*&, BeginTag*&, Range&, bool& inVMHeap);
void mergeLargeRight(EndTag*&, BeginTag*&, Range&, bool& inVMHeap);
XLargeRange splitAndAllocate(XLargeRange&, size_t alignment, size_t);
void concurrentScavenge();
void scavengeSmallPages(std::unique_lock<StaticMutex>&, std::chrono::milliseconds);
void scavengeLargeObjects(std::unique_lock<StaticMutex>&, std::chrono::milliseconds);
size_t m_vmPageSizePhysical;
Vector<LineMetadata> m_smallLineMetadata;
std::array<size_t, sizeClassCount> m_pageClasses;
std::array<List<SmallPage>, sizeClassCount> m_smallPagesWithFreeLines;
std::array<List<SmallPage>, pageClassCount> m_smallPages;
Map<void*, size_t, LargeObjectHash> m_largeAllocated;
XLargeMap m_largeFree;
Map<Chunk*, ObjectType, ChunkHash> m_objectTypes;
bool m_isAllocatingPages;
AsyncTask<Heap, decltype(&Heap::concurrentScavenge)> m_scavenger;
Environment m_environment;
VMHeap m_vmHeap;
};
inline void Heap::allocateSmallBumpRanges(
std::lock_guard<StaticMutex>& lock, size_t sizeClass,
BumpAllocator& allocator, BumpRangeCache& rangeCache)
{
if (sizeClass < bmalloc::sizeClass(smallLineSize))
return allocateSmallBumpRangesByMetadata(lock, sizeClass, allocator, rangeCache);
return allocateSmallBumpRangesByObject(lock, sizeClass, allocator, rangeCache);
}
inline void Heap::derefSmallLine(std::lock_guard<StaticMutex>& lock, Object object)
{
if (!object.line()->deref(lock))
return;
deallocateSmallLine(lock, object);
}
} // namespace bmalloc
#endif // Heap_h
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