DFGVariableAccessData.h [plain text]
#ifndef DFGVariableAccessData_h
#define DFGVariableAccessData_h
#if ENABLE(DFG_JIT)
#include "DFGCommon.h"
#include "DFGDoubleFormatState.h"
#include "DFGFlushFormat.h"
#include "DFGFlushedAt.h"
#include "DFGNodeFlags.h"
#include "Operands.h"
#include "SpeculatedType.h"
#include "VirtualRegister.h"
#include <wtf/UnionFind.h>
#include <wtf/Vector.h>
namespace JSC { namespace DFG {
struct Node;
enum DoubleBallot { VoteValue, VoteDouble };
class VariableAccessData : public UnionFind<VariableAccessData> {
public:
VariableAccessData();
VariableAccessData(VirtualRegister local, bool isCaptured);
VirtualRegister local()
{
ASSERT(m_local == find()->m_local);
return m_local;
}
VirtualRegister& machineLocal()
{
ASSERT(find() == this);
return m_machineLocal;
}
bool mergeIsCaptured(bool isCaptured);
bool isCaptured()
{
return m_isCaptured;
}
bool mergeIsProfitableToUnbox(bool isProfitableToUnbox)
{
return checkAndSet(m_isProfitableToUnbox, m_isProfitableToUnbox | isProfitableToUnbox);
}
bool isProfitableToUnbox()
{
return m_isProfitableToUnbox;
}
bool mergeShouldNeverUnbox(bool shouldNeverUnbox);
bool shouldNeverUnbox()
{
ASSERT(!(m_isCaptured && !m_shouldNeverUnbox));
return m_shouldNeverUnbox;
}
bool shouldUnboxIfPossible()
{
return !shouldNeverUnbox() && isProfitableToUnbox();
}
bool mergeStructureCheckHoistingFailed(bool failed)
{
return checkAndSet(m_structureCheckHoistingFailed, m_structureCheckHoistingFailed | failed);
}
bool mergeCheckArrayHoistingFailed(bool failed)
{
return checkAndSet(m_checkArrayHoistingFailed, m_checkArrayHoistingFailed | failed);
}
bool structureCheckHoistingFailed()
{
return m_structureCheckHoistingFailed;
}
bool checkArrayHoistingFailed()
{
return m_checkArrayHoistingFailed;
}
bool mergeIsArgumentsAlias(bool isArgumentsAlias)
{
return checkAndSet(m_isArgumentsAlias, m_isArgumentsAlias | isArgumentsAlias);
}
bool isArgumentsAlias()
{
return m_isArgumentsAlias;
}
bool mergeIsLoadedFrom(bool isLoadedFrom)
{
return checkAndSet(m_isLoadedFrom, m_isLoadedFrom | isLoadedFrom);
}
void setIsLoadedFrom(bool isLoadedFrom)
{
m_isLoadedFrom = isLoadedFrom;
}
bool isLoadedFrom()
{
return m_isLoadedFrom;
}
bool predict(SpeculatedType prediction);
SpeculatedType nonUnifiedPrediction()
{
return m_prediction;
}
SpeculatedType prediction()
{
return find()->m_prediction;
}
SpeculatedType argumentAwarePrediction()
{
return find()->m_argumentAwarePrediction;
}
bool mergeArgumentAwarePrediction(SpeculatedType prediction);
void clearVotes()
{
ASSERT(find() == this);
m_votes[0] = 0;
m_votes[1] = 0;
}
void vote(unsigned ballot, float weight = 1)
{
ASSERT(ballot < 2);
m_votes[ballot] += weight;
}
double voteRatio()
{
ASSERT(find() == this);
return static_cast<double>(m_votes[1]) / m_votes[0];
}
bool shouldUseDoubleFormatAccordingToVote();
DoubleFormatState doubleFormatState()
{
return find()->m_doubleFormatState;
}
bool shouldUseDoubleFormat()
{
ASSERT(isRoot());
bool doubleState = m_doubleFormatState == UsingDoubleFormat;
ASSERT(!(doubleState && shouldNeverUnbox()));
ASSERT(!(doubleState && isCaptured()));
return doubleState && isProfitableToUnbox();
}
bool tallyVotesForShouldUseDoubleFormat();
bool mergeDoubleFormatState(DoubleFormatState);
bool makePredictionForDoubleFormat();
NodeFlags flags() const { return m_flags; }
bool mergeFlags(NodeFlags newFlags)
{
return checkAndSet(m_flags, m_flags | newFlags);
}
FlushFormat flushFormat();
bool couldRepresentInt52();
FlushedAt flushedAt()
{
return FlushedAt(flushFormat(), machineLocal());
}
private:
bool couldRepresentInt52Impl();
VirtualRegister m_local;
VirtualRegister m_machineLocal;
SpeculatedType m_prediction;
SpeculatedType m_argumentAwarePrediction;
NodeFlags m_flags;
bool m_isCaptured;
bool m_shouldNeverUnbox;
bool m_isArgumentsAlias;
bool m_structureCheckHoistingFailed;
bool m_checkArrayHoistingFailed;
bool m_isProfitableToUnbox;
bool m_isLoadedFrom;
float m_votes[2]; DoubleFormatState m_doubleFormatState;
};
} }
#endif // ENABLE(DFG_JIT)
#endif // DFGVariableAccessData_h