#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;
};
}
#endif // PutByIdVariant_h