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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 "StructureIDTable.h"
#include "VM.h"
#include <wtf/Vector.h>
namespace JSC {
class JSCell;
class JSGlobalObject;
class JSObject;
class PropertySlot;
class Structure;
class PolyProtoAccessChain {
WTF_MAKE_FAST_ALLOCATED;
public:
PolyProtoAccessChain(PolyProtoAccessChain&) = default;
// Returns nullptr when invalid.
static std::unique_ptr<PolyProtoAccessChain> create(JSGlobalObject*, JSCell* base, const PropertySlot&);
static std::unique_ptr<PolyProtoAccessChain> create(JSGlobalObject*, JSCell* base, JSObject* target);
std::unique_ptr<PolyProtoAccessChain> clone()
{
return makeUnique<PolyProtoAccessChain>(*this);
}
const Vector<StructureID>& chain() const { return m_chain; }
void dump(Structure* baseStructure, PrintStream& out) const;
bool operator==(const PolyProtoAccessChain& other) const;
bool operator!=(const PolyProtoAccessChain& other) const
{
return !(*this == other);
}
bool needImpurePropertyWatchpoint(VM&) const;
template <typename Func>
void forEach(VM& 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(vm.getStructure(m_chain[i]), atEnd);
}
}
Structure* slotBaseStructure(VM& vm, Structure* baseStructure) const
{
if (m_chain.size())
return vm.getStructure(m_chain.last());
return baseStructure;
}
private:
PolyProtoAccessChain() = default;
// 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.
Vector<StructureID> m_chain;
};
}