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/*
* Copyright (C) 2014 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.
*/
#ifndef PutByIdVariant_h
#define PutByIdVariant_h
#include "IntendedStructureChain.h"
#include "PropertyOffset.h"
#include "StructureSet.h"
namespace JSC {
class CallLinkStatus;
class PutByIdVariant {
public:
enum Kind {
NotSet,
Replace,
Transition,
Setter
};
PutByIdVariant()
: m_kind(NotSet)
, m_newStructure(nullptr)
, m_alternateBase(nullptr)
, m_offset(invalidOffset)
{
}
PutByIdVariant(const PutByIdVariant&);
PutByIdVariant& operator=(const PutByIdVariant&);
static PutByIdVariant replace(
const StructureSet& structure, PropertyOffset offset);
static PutByIdVariant transition(
const StructureSet& oldStructure, Structure* newStructure,
const IntendedStructureChain* structureChain, PropertyOffset offset);
static PutByIdVariant setter(
const StructureSet& structure, PropertyOffset offset,
IntendedStructureChain* chain, std::unique_ptr<CallLinkStatus> callLinkStatus);
Kind kind() const { return m_kind; }
bool isSet() const { return kind() != NotSet; }
bool operator!() const { return !isSet(); }
const StructureSet& structure() const
{
ASSERT(kind() == Replace || kind() == Setter);
return m_oldStructure;
}
const StructureSet& oldStructure() const
{
ASSERT(kind() == Transition || kind() == Replace || kind() == Setter);
return m_oldStructure;
}
StructureSet& oldStructure()
{
ASSERT(kind() == Transition || kind() == Replace || kind() == Setter);
return m_oldStructure;
}
Structure* oldStructureForTransition() const;
Structure* newStructure() const
{
ASSERT(kind() == Transition);
return m_newStructure;
}
bool writesStructures() const;
bool reallocatesStorage() const;
bool makesCalls() const;
const ConstantStructureCheckVector& constantChecks() const
{
return m_constantChecks;
}
PropertyOffset offset() const
{
ASSERT(isSet());
return m_offset;
}
JSObject* alternateBase() const
{
ASSERT(kind() == Setter);
return m_alternateBase;
}
StructureSet baseStructure() const;
CallLinkStatus* callLinkStatus() const
{
ASSERT(kind() == Setter);
return m_callLinkStatus.get();
}
bool attemptToMerge(const PutByIdVariant& other);
void dump(PrintStream&) const;
void dumpInContext(PrintStream&, DumpContext*) const;
private:
bool attemptToMergeTransitionWithReplace(const PutByIdVariant& replace);
Kind m_kind;
StructureSet m_oldStructure;
Structure* m_newStructure;
ConstantStructureCheckVector m_constantChecks;
JSObject* m_alternateBase;
PropertyOffset m_offset;
std::unique_ptr<CallLinkStatus> m_callLinkStatus;
};
} // namespace JSC
#endif // PutByIdVariant_h
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