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/*
* Copyright (C) 2017-2021 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.
*/
#pragma once
#include "AlignedMemoryAllocator.h"
#include <wtf/BitVector.h>
#include <wtf/DebugHeap.h>
#include <wtf/HashMap.h>
#include <wtf/Vector.h>
namespace JSC {
class IsoMemoryAllocatorBase : public AlignedMemoryAllocator {
public:
IsoMemoryAllocatorBase(CString);
~IsoMemoryAllocatorBase() override;
void* tryAllocateAlignedMemory(size_t alignment, size_t size) final;
void freeAlignedMemory(void*) final;
protected:
void releaseMemoryFromSubclassDestructor();
virtual void* tryMallocBlock() = 0;
virtual void freeBlock(void* block) = 0;
virtual void commitBlock(void* block) = 0;
virtual void decommitBlock(void* block) = 0;
private:
Vector<void*> m_blocks;
UncheckedKeyHashMap<void*, unsigned> m_blockIndices;
BitVector m_committed;
unsigned m_firstUncommitted { 0 };
Lock m_lock;
};
} // namespace JSC
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