AndersenPWC.h

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//===- AndersenSFR.h -- SFR based field-sensitive Andersen's 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/>.
//
//===----------------------------------------------------------------------===//
 
/*
 * AndersenSFR.h
 *
 *  Created on: 09, Feb, 2019
 *      Author: Yuxiang Lei
 */
 
#ifndef PROJECT_ANDERSENSFR_H
#define PROJECT_ANDERSENSFR_H
 
 
#include "WPA/Andersen.h"
#include "WPA/CSC.h"
#include "MemoryModel/PointsTo.h"
 
namespace SVF
{
 
class AndersenSCD : public Andersen
{
public:
    typedef Map<NodeID, NodeID> NodeToNodeMap;
 
protected:
    static AndersenSCD* scdAndersen;
    NodeSet sccCandidates;
    NodeToNodeMap pwcReps;
 
public:
    AndersenSCD(SVFIR* _pag, PTATY type = AndersenSCD_WPA) :
        Andersen(_pag,type)
    {
    }
 
    static AndersenSCD *createAndersenSCD(SVFIR* _pag)
    {
        if (scdAndersen == nullptr)
        {
            scdAndersen = new AndersenSCD(_pag);
            scdAndersen->analyze();
            return scdAndersen;
        }
        return scdAndersen;
    }
 
    static void releaseAndersenSCD()
    {
        if (scdAndersen)
            delete scdAndersen;
        scdAndersen = nullptr;
    }
 
protected:
    inline void addSccCandidate(NodeID nodeId)
    {
        sccCandidates.insert(sccRepNode(nodeId));
    }
 
    virtual NodeStack& SCCDetect();
    virtual void PWCDetect();
    virtual void solveWorklist();
    virtual void handleLoadStore(ConstraintNode* node);
    virtual void processAddr(const AddrCGEdge* addr);
    virtual bool addCopyEdge(NodeID src, NodeID dst);
    virtual bool updateCallGraph(const CallSiteToFunPtrMap& callsites);
    virtual void processPWC(ConstraintNode* rep);
    virtual void handleCopyGep(ConstraintNode* node);
 
};
 
 
 
class AndersenSFR : public AndersenSCD
{
public:
    typedef Map<NodeID, NodeBS> NodeStrides;
    typedef Map<NodeID, NodeSet> FieldReps;
    typedef Map<NodeID, std::pair<NodeID, NodeSet>> SFRTrait;
 
private:
    static AndersenSFR* sfrAndersen;
 
    CSC* csc;
    NodeSet sfrObjNodes;
    FieldReps fieldReps;
 
public:
    AndersenSFR(SVFIR* _pag, PTATY type = AndersenSFR_WPA) :
        AndersenSCD(_pag, type), csc(nullptr)
    {
    }
 
    static AndersenSFR *createAndersenSFR(SVFIR* _pag)
    {
        if (sfrAndersen == nullptr)
        {
            sfrAndersen = new AndersenSFR(_pag);
            sfrAndersen->analyze();
            return sfrAndersen;
        }
        return sfrAndersen;
    }
 
    static void releaseAndersenSFR()
    {
        if (sfrAndersen)
            delete sfrAndersen;
    }
 
    ~AndersenSFR()
    {
        if (csc != nullptr)
        {
            delete(csc);
            csc = nullptr;
        }
    }
 
protected:
    void initialize();
    void PWCDetect();
    void fieldExpand(NodeSet& initials, APOffset offset, NodeBS& strides, PointsTo& expandPts);
    bool processGepPts(const PointsTo& pts, const GepCGEdge* edge);
    bool mergeSrcToTgt(NodeID nodeId, NodeID newRepId);
 
};
 
} // End namespace SVF
 
#endif //PROJECT_ANDERSENSFR_H