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/*
* Copyright (C) 2011 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 PredictionTracker_h
#define PredictionTracker_h
#include "PredictedType.h"
#include <wtf/HashMap.h>
namespace JSC {
struct PredictionSlot {
public:
PredictionSlot()
: m_value(PredictNone)
{
}
PredictedType m_value;
};
class PredictionTracker {
public:
PredictionTracker()
{
}
bool predictGlobalVar(unsigned varNumber, PredictedType prediction)
{
HashMap<unsigned, PredictionSlot>::iterator iter = m_globalVars.find(varNumber + 1);
if (iter == m_globalVars.end()) {
PredictionSlot predictionSlot;
bool result = mergePrediction(predictionSlot.m_value, prediction);
m_globalVars.add(varNumber + 1, predictionSlot);
return result;
}
return mergePrediction(iter->second.m_value, prediction);
}
PredictedType getGlobalVarPrediction(unsigned varNumber)
{
HashMap<unsigned, PredictionSlot>::iterator iter = m_globalVars.find(varNumber + 1);
if (iter == m_globalVars.end())
return PredictNone;
return iter->second.m_value;
}
private:
HashMap<unsigned, PredictionSlot> m_globalVars;
};
} // namespace JSC
#endif // PredictionTracker_h
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