mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-07 17:31:46 +00:00
103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
/*
|
|
* Copyright (C) 2016-2019 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 <wtf/StdLibExtras.h>
|
|
|
|
namespace JSC {
|
|
|
|
class Heap;
|
|
class HeapCell;
|
|
class PreciseAllocation;
|
|
class MarkedBlock;
|
|
class WeakSet;
|
|
class VM;
|
|
|
|
typedef uint32_t HeapVersion;
|
|
|
|
// This is how we abstract over either MarkedBlock& or PreciseAllocation&. Put things in here as you
|
|
// find need for them.
|
|
|
|
class CellContainer {
|
|
public:
|
|
CellContainer()
|
|
: m_encodedPointer(0)
|
|
{
|
|
}
|
|
|
|
CellContainer(MarkedBlock& markedBlock)
|
|
: m_encodedPointer(bitwise_cast<uintptr_t>(&markedBlock))
|
|
{
|
|
}
|
|
|
|
CellContainer(PreciseAllocation& preciseAllocation)
|
|
: m_encodedPointer(bitwise_cast<uintptr_t>(&preciseAllocation) | isPreciseAllocationBit)
|
|
{
|
|
}
|
|
|
|
VM& vm() const;
|
|
Heap* heap() const;
|
|
|
|
explicit operator bool() const { return !!m_encodedPointer; }
|
|
|
|
bool isMarkedBlock() const { return m_encodedPointer && !(m_encodedPointer & isPreciseAllocationBit); }
|
|
bool isPreciseAllocation() const { return m_encodedPointer & isPreciseAllocationBit; }
|
|
|
|
MarkedBlock& markedBlock() const
|
|
{
|
|
ASSERT(isMarkedBlock());
|
|
return *bitwise_cast<MarkedBlock*>(m_encodedPointer);
|
|
}
|
|
|
|
PreciseAllocation& preciseAllocation() const
|
|
{
|
|
ASSERT(isPreciseAllocation());
|
|
return *bitwise_cast<PreciseAllocation*>(m_encodedPointer - isPreciseAllocationBit);
|
|
}
|
|
|
|
void aboutToMark(HeapVersion markingVersion);
|
|
bool areMarksStale() const;
|
|
|
|
bool isMarked(HeapCell*) const;
|
|
bool isMarked(HeapVersion markingVersion, HeapCell*) const;
|
|
|
|
bool isNewlyAllocated(HeapCell*) const;
|
|
|
|
void noteMarked();
|
|
void assertValidCell(VM&, HeapCell*) const;
|
|
|
|
size_t cellSize() const;
|
|
|
|
WeakSet& weakSet() const;
|
|
|
|
private:
|
|
static constexpr uintptr_t isPreciseAllocationBit = 1;
|
|
uintptr_t m_encodedPointer;
|
|
};
|
|
|
|
} // namespace JSC
|
|
|