/* * 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