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/*
* Copyright (C) 2016-2020 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 "HeapCell.h"
#include "HeapCellInlines.h"
#include "MarkedBlockInlines.h"
#include <wtf/PrintStream.h>
namespace JSC {
// isPendingDestruction must not be called on a freed (i.e. already destructed) HeapCell
// since the backing MarkedBlock may have been freed too.
bool HeapCell::isPendingDestruction()
{
if (isPreciseAllocation())
return !preciseAllocation().isLive();
auto& markedBlockHandle = markedBlock().handle();
// If the block is freelisted then either:
// (1) The cell is not on the FreeList, in which case it is newly allocated or
// (2) The cell is on the FreeList, in which case it is free.
// In either case, the destructor is not pending.
// (And as indicated above, it's not legal to call this method in state #2).
if (markedBlockHandle.isFreeListed())
return false;
return !markedBlockHandle.isLive(this);
}
} // namespace JSC
namespace WTF {
using namespace JSC;
void printInternal(PrintStream& out, HeapCell::Kind kind)
{
switch (kind) {
case HeapCell::JSCell:
out.print("JSCell");
return;
case HeapCell::JSCellWithIndexingHeader:
out.print("JSCellWithIndexingHeader");
return;
case HeapCell::Auxiliary:
out.print("Auxiliary");
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
} // namespace WTF
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