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/*
* Copyright (C) 2013-2024 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. AND ITS CONTRIBUTORS ``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 ITS 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 "Heap.h"
#include <wtf/Noncopyable.h>
namespace JSC {
class HeapIterationScope {
WTF_MAKE_NONCOPYABLE(HeapIterationScope);
public:
HeapIterationScope(Heap&);
~HeapIterationScope();
private:
JSC::Heap& m_heap;
};
inline HeapIterationScope::HeapIterationScope(JSC::Heap& heap)
: m_heap(heap)
{
// FIXME: It would be nice to assert we're holding the API lock when iterating the heap so we know no other thread is mutating the heap
// but adding `ASSERT_WITH_MESSAGE(heap.vm().currentThreadIsHoldingAPILock(), "Trying to iterate the JS heap without the API lock");`
// causes spurious crashes since the only thing technically needed is just heap.hasAccess() but that doesn't verify this thread is
// the one with access only that *some* thread has access.
m_heap.willStartIterating();
}
inline HeapIterationScope::~HeapIterationScope()
{
m_heap.didFinishIterating();
}
} // namespace JSC
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