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/*
* Copyright (C) 2015 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.
*/
#include "config.h"
#include "CopiedBlock.h"
#include "JSCInlines.h"
namespace JSC {
static const bool computeBalance = false;
static size_t balance;
CopiedBlock* CopiedBlock::createNoZeroFill(Heap& heap, size_t capacity)
{
if (computeBalance) {
balance++;
if (!(balance % 10))
dataLog("CopiedBlock Balance: ", balance, "\n");
}
CopiedBlock* block = new (NotNull, fastAlignedMalloc(CopiedBlock::blockSize, capacity)) CopiedBlock(capacity);
heap.didAllocateBlock(capacity);
return block;
}
void CopiedBlock::destroy(Heap& heap, CopiedBlock* copiedBlock)
{
if (computeBalance) {
balance--;
if (!(balance % 10))
dataLog("CopiedBlock Balance: ", balance, "\n");
}
size_t capacity = copiedBlock->capacity();
copiedBlock->~CopiedBlock();
fastAlignedFree(copiedBlock);
heap.didFreeBlock(capacity);
}
CopiedBlock* CopiedBlock::create(Heap& heap, size_t capacity)
{
CopiedBlock* newBlock = createNoZeroFill(heap, capacity);
newBlock->zeroFillWilderness();
return newBlock;
}
void CopiedBlock::zeroFillWilderness()
{
#if USE(JSVALUE64)
memset(wilderness(), 0, wildernessSize());
#else
JSValue emptyValue;
JSValue* limit = reinterpret_cast_ptr<JSValue*>(wildernessEnd());
for (JSValue* currentValue = reinterpret_cast_ptr<JSValue*>(wilderness()); currentValue < limit; currentValue++)
*currentValue = emptyValue;
#endif
}
CopiedBlock::CopiedBlock(size_t capacity)
: DoublyLinkedListNode<CopiedBlock>()
, m_capacity(capacity)
, m_remaining(payloadCapacity())
, m_isPinned(false)
, m_isOld(false)
, m_liveBytes(0)
#ifndef NDEBUG
, m_liveObjects(0)
#endif
{
ASSERT(is8ByteAligned(reinterpret_cast<void*>(m_remaining)));
}
} // namespace JSC
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