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/*
* Copyright (C) 2017 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 "CacheableIdentifier.h"
#include "StructureID.h"
#include "VM.h"
#include <wtf/FixedVector.h>
#include <wtf/Vector.h>
namespace JSC {
class JSCell;
class JSGlobalObject;
class JSObject;
class PropertySlot;
class Structure;
class PolyProtoAccessChain final : public ThreadSafeRefCounted<PolyProtoAccessChain> {
public:
// Returns nullptr when invalid.
static RefPtr<PolyProtoAccessChain> tryCreate(JSGlobalObject*, JSCell* base, CacheableIdentifier, const PropertySlot&);
static RefPtr<PolyProtoAccessChain> tryCreate(JSGlobalObject*, JSCell* base, CacheableIdentifier, JSObject* target);
const FixedVector<StructureID>& chain() const { return m_chain; }
void dump(Structure* baseStructure, PrintStream& out) const;
bool operator==(const PolyProtoAccessChain&) const;
bool needImpurePropertyWatchpoint(VM&) const;
template <typename Func>
void forEach(VM&, Structure* baseStructure, const Func& func) const
{
bool atEnd = !m_chain.size();
func(baseStructure, atEnd);
for (unsigned i = 0; i < m_chain.size(); ++i) {
atEnd = i + 1 == m_chain.size();
func(m_chain[i].decode(), atEnd);
}
}
Structure* slotBaseStructure(VM&, Structure* baseStructure) const
{
if (m_chain.size())
return m_chain.last().decode();
return baseStructure;
}
private:
explicit PolyProtoAccessChain(Vector<StructureID>&& chain)
: m_chain(WTFMove(chain))
{
}
// This does not include the base. We rely on AccessCase providing it for us. That said, this data
// structure is tied to the base that it was created with.
FixedVector<StructureID> m_chain;
};
}
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