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/*
* Copyright (C) 2018-2019 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.
*/
#include "config.h"
#include "IsoSubspacePerVM.h"
#include "JSCInlines.h"
namespace JSC {
class IsoSubspacePerVM::AutoremovingIsoSubspace : public IsoSubspace {
public:
AutoremovingIsoSubspace(IsoSubspacePerVM& perVM, CString name, Heap& heap, HeapCellType* heapCellType, size_t size)
: IsoSubspace(name, heap, heapCellType, size, /* numberOfLowerTierCells */ 0)
, m_perVM(perVM)
{
}
~AutoremovingIsoSubspace()
{
auto locker = holdLock(m_perVM.m_lock);
m_perVM.m_subspacePerVM.remove(&space().heap().vm());
}
private:
IsoSubspacePerVM& m_perVM;
};
IsoSubspacePerVM::IsoSubspacePerVM(Function<SubspaceParameters(VM&)> subspaceParameters)
: m_subspaceParameters(WTFMove(subspaceParameters))
{
}
IsoSubspacePerVM::~IsoSubspacePerVM()
{
UNREACHABLE_FOR_PLATFORM();
}
IsoSubspace& IsoSubspacePerVM::forVM(VM& vm)
{
auto locker = holdLock(m_lock);
auto result = m_subspacePerVM.add(&vm, nullptr);
if (result.isNewEntry) {
SubspaceParameters params = m_subspaceParameters(vm);
result.iterator->value = new AutoremovingIsoSubspace(*this, params.name, vm.heap, params.heapCellType, params.size);
}
return *result.iterator->value;
}
} // namespace JSC