#ifndef PutByIdVariant_h
#define PutByIdVariant_h
#include "IntendedStructureChain.h"
#include "PropertyOffset.h"
namespace JSC {
class PutByIdVariant {
public:
enum Kind {
NotSet,
Replace,
Transition
};
PutByIdVariant()
: m_kind(NotSet)
, m_oldStructure(0)
, m_newStructure(0)
, m_offset(invalidOffset)
{
}
static PutByIdVariant replace(Structure* structure, PropertyOffset offset)
{
PutByIdVariant result;
result.m_kind = Replace;
result.m_oldStructure = structure;
result.m_offset = offset;
return result;
}
static PutByIdVariant transition(
Structure* oldStructure, Structure* newStructure,
PassRefPtr<IntendedStructureChain> structureChain, PropertyOffset offset)
{
PutByIdVariant result;
result.m_kind = Transition;
result.m_oldStructure = oldStructure;
result.m_newStructure = newStructure;
result.m_structureChain = structureChain;
result.m_offset = offset;
return result;
}
Kind kind() const { return m_kind; }
bool isSet() const { return kind() != NotSet; }
bool operator!() const { return !isSet(); }
Structure* structure() const
{
ASSERT(kind() == Replace);
return m_oldStructure;
}
Structure* oldStructure() const
{
ASSERT(kind() == Transition || kind() == Replace);
return m_oldStructure;
}
Structure* newStructure() const
{
ASSERT(kind() == Transition);
return m_newStructure;
}
IntendedStructureChain* structureChain() const
{
ASSERT(kind() == Transition);
return m_structureChain.get();
}
PropertyOffset offset() const
{
ASSERT(isSet());
return m_offset;
}
void dump(PrintStream&) const;
void dumpInContext(PrintStream&, DumpContext*) const;
private:
Kind m_kind;
Structure* m_oldStructure;
Structure* m_newStructure;
RefPtr<IntendedStructureChain> m_structureChain;
PropertyOffset m_offset;
};
}
#endif // PutByIdVariant_h