FlowSensitive.h

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//===- FlowSensitive.h -- Flow-sensitive pointer analysis---------------------//
//
//                     SVF: Static Value-Flow Analysis
//
// Copyright (C) <2013-2017>  <Yulei Sui>
//
 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
 
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
//===----------------------------------------------------------------------===//
 
/*
 * FlowSensitiveAnalysis.h
 *
 *  Created on: Oct 28, 2013
 *      Author: Yulei Sui
 */
 
#ifndef FLOWSENSITIVEANALYSIS_H_
#define FLOWSENSITIVEANALYSIS_H_
 
#include "FastCluster/fastcluster.h"
#include "Graphs/SVFGOPT.h"
#include "MemoryModel/PointerAnalysisImpl.h"
#include "MSSA/SVFGBuilder.h"
#include "WPA/WPAFSSolver.h"
 
namespace SVF
{
 
class AndersenWaveDiff;
class SVFModule;
 
typedef WPAFSSolver<SVFG*> WPASVFGFSSolver;
class FlowSensitive : public WPASVFGFSSolver, public BVDataPTAImpl
{
    friend class FlowSensitiveStat;
protected:
    typedef SVFG::SVFGEdgeSetTy SVFGEdgeSetTy;
 
public:
    typedef BVDataPTAImpl::MutDFPTDataTy MutDFPTDataTy;
    typedef BVDataPTAImpl::MutDFPTDataTy::DFPtsMap DFInOutMap;
    typedef BVDataPTAImpl::MutDFPTDataTy::PtsMap PtsMap;
 
    explicit FlowSensitive(SVFIR* _pag, PTATY type = FSSPARSE_WPA) : WPASVFGFSSolver(), BVDataPTAImpl(_pag, type)
    {
        svfg = nullptr;
        solveTime = sccTime = processTime = propagationTime = updateTime = 0;
        addrTime = copyTime = gepTime = loadTime = storeTime = phiTime = 0;
        updateCallGraphTime = directPropaTime = indirectPropaTime = 0;
        numOfProcessedAddr = numOfProcessedCopy = numOfProcessedGep = 0;
        numOfProcessedLoad = numOfProcessedStore = 0;
        numOfProcessedPhi = numOfProcessedActualParam = numOfProcessedFormalRet = 0;
        numOfProcessedMSSANode = 0;
        maxSCCSize = numOfSCC = numOfNodesInSCC = 0;
        iterationForPrintStat = OnTheFlyIterBudgetForStat;
    }
 
    ~FlowSensitive() override = default;
 
    static FlowSensitive* createFSWPA(SVFIR* _pag)
    {
        if (fspta == nullptr)
        {
            fspta = std::unique_ptr<FlowSensitive>(new FlowSensitive(_pag));
            fspta->analyze();
        }
        return fspta.get();
    }
 
    static void releaseFSWPA()
    {
        fspta = nullptr;
    }
 
    virtual bool runOnModule(SVFModule*)
    {
        return false;
    }
 
    void analyze() override;
 
    virtual void solveAndwritePtsToFile(const std::string& filename);
 
    virtual void readPtsFromFile(const std::string& filename);
 
    virtual void solveConstraints();
 
    void initialize() override;
 
    void finalize() override;
 
    const std::string PTAName() const override
    {
        return "FlowSensitive";
    }
 
 
    static inline bool classof(const FlowSensitive *)
    {
        return true;
    }
    static inline bool classof(const PointerAnalysis *pta)
    {
        return pta->getAnalysisTy() == FSSPARSE_WPA;
    }
 
    inline SVFG* getSVFG() const
    {
        return svfg;
    }
 
protected:
    NodeStack& SCCDetect() override;
 
 
 
    bool propFromSrcToDst(SVFGEdge* edge) override;
    virtual bool propAlongDirectEdge(const DirectSVFGEdge* edge);
    virtual bool propAlongIndirectEdge(const IndirectSVFGEdge* edge);
    virtual bool propVarPtsFromSrcToDst(NodeID var, const SVFGNode* src, const SVFGNode* dst);
    virtual bool propagateFromAPToFP(const ActualParmSVFGNode* ap, const SVFGNode* dst);
    virtual bool propagateFromFRToAR(const FormalRetSVFGNode* fr, const SVFGNode* dst);
    virtual bool weakUpdateOutFromIn(const SVFGNode* node)
    {
        return getDFPTDataTy()->updateAllDFOutFromIn(node->getId(),0,false);
    }
    virtual bool strongUpdateOutFromIn(const SVFGNode* node, NodeID singleton)
    {
        return getDFPTDataTy()->updateAllDFOutFromIn(node->getId(),singleton,true);
    }
 
 
    bool propVarPtsAfterCGUpdated(NodeID var, const SVFGNode* src, const SVFGNode* dst);
 
    virtual inline bool propDFOutToIn(const SVFGNode* srcStmt, NodeID srcVar, const SVFGNode* dstStmt, NodeID dstVar)
    {
        return getDFPTDataTy()->updateAllDFInFromOut(srcStmt->getId(), srcVar, dstStmt->getId(),dstVar);
    }
    virtual inline bool propDFInToIn(const SVFGNode* srcStmt, NodeID srcVar, const SVFGNode* dstStmt, NodeID dstVar)
    {
        return getDFPTDataTy()->updateAllDFInFromIn(srcStmt->getId(), srcVar, dstStmt->getId(),dstVar);
    }
 
 
    inline bool updateOutFromIn(const SVFGNode* srcStmt, NodeID srcVar, const SVFGNode* dstStmt, NodeID dstVar)
    {
        return getDFPTDataTy()->updateDFOutFromIn(srcStmt->getId(),srcVar, dstStmt->getId(),dstVar);
    }
    virtual inline bool updateInFromIn(const SVFGNode* srcStmt, NodeID srcVar, const SVFGNode* dstStmt, NodeID dstVar)
    {
        return getDFPTDataTy()->updateDFInFromIn(srcStmt->getId(),srcVar, dstStmt->getId(),dstVar);
    }
    virtual inline bool updateInFromOut(const SVFGNode* srcStmt, NodeID srcVar, const SVFGNode* dstStmt, NodeID dstVar)
    {
        return getDFPTDataTy()->updateDFInFromOut(srcStmt->getId(),srcVar, dstStmt->getId(),dstVar);
    }
 
    virtual inline bool unionPtsFromIn(const SVFGNode* stmt, NodeID srcVar, NodeID dstVar)
    {
        return getDFPTDataTy()->updateTLVPts(stmt->getId(),srcVar,dstVar);
    }
    virtual inline bool unionPtsFromTop(const SVFGNode* stmt, NodeID srcVar, NodeID dstVar)
    {
        return getDFPTDataTy()->updateATVPts(srcVar,stmt->getId(),dstVar);
    }
 
    inline void clearAllDFOutVarFlag(const SVFGNode* stmt)
    {
        getDFPTDataTy()->clearAllDFOutUpdatedVar(stmt->getId());
    }
 
 
    void processNode(NodeID nodeId) override;
    bool processSVFGNode(SVFGNode* node);
    virtual bool processAddr(const AddrSVFGNode* addr);
    virtual bool processCopy(const CopySVFGNode* copy);
    virtual bool processPhi(const PHISVFGNode* phi);
    virtual bool processGep(const GepSVFGNode* edge);
    virtual bool processLoad(const LoadSVFGNode* load);
    virtual bool processStore(const StoreSVFGNode* store);
 
 
 
    bool updateCallGraph(const CallSiteToFunPtrMap& callsites) override;
    void connectCallerAndCallee(const CallEdgeMap& newEdges, SVFGEdgeSetTy& edges);
    virtual void updateConnectedNodes(const SVFGEdgeSetTy& edges);
 
    bool isStrongUpdate(const SVFGNode* node, NodeID& singleton);
 
    virtual void countAliases(Set<std::pair<NodeID, NodeID>> cmp, unsigned *mayAliases, unsigned *noAliases);
 
    SVFG* svfg;
 
    inline const PointsTo& getDFInPtsSet(const SVFGNode* stmt, const NodeID node)
    {
        return getDFPTDataTy()->getDFInPtsSet(stmt->getId(),node);
    }
    inline const PointsTo& getDFOutPtsSet(const SVFGNode* stmt, const NodeID node)
    {
        return getDFPTDataTy()->getDFOutPtsSet(stmt->getId(),node);
    }
 
    inline const DFInOutMap& getDFInputMap() const
    {
        return getMutDFPTDataTy()->getDFIn();
    }
    inline const DFInOutMap& getDFOutputMap() const
    {
        return getMutDFPTDataTy()->getDFOut();
    }
 
    virtual void cluster(void);
    virtual void plainMap(void) const;
 
    static std::unique_ptr<FlowSensitive> fspta;
    SVFGBuilder memSSA;
    AndersenWaveDiff *ander;
 
    std::vector<std::pair<hclust_fast_methods, std::vector<NodeID>>> candidateMappings;
 
 
    u32_t numOfProcessedAddr;   
    u32_t numOfProcessedCopy;   
    u32_t numOfProcessedGep;    
    u32_t numOfProcessedPhi;    
    u32_t numOfProcessedLoad;   
    u32_t numOfProcessedStore;  
    u32_t numOfProcessedActualParam;    
    u32_t numOfProcessedFormalRet;  
    u32_t numOfProcessedMSSANode;   
 
    u32_t maxSCCSize;
    u32_t numOfSCC;
    u32_t numOfNodesInSCC;
 
    double solveTime;   
    double sccTime; 
    double processTime; 
    double propagationTime; 
    double directPropaTime; 
    double indirectPropaTime; 
    double updateTime;  
    double addrTime;    
    double copyTime;    
    double gepTime; 
    double loadTime;    
    double storeTime;   
    double phiTime; 
    double updateCallGraphTime; 
 
    NodeBS svfgHasSU;
 
    void svfgStat();
};
 
} // End namespace SVF
 
#endif /* FLOWSENSITIVEANALYSIS_H_ */