DDAClient.cpp

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//===- DDAClient.cpp -- Clients of demand-driven analysis-------------//
//
//                     SVF: Static Value-Flow Analysis
//
// Copyright (C) <2013->  <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/>.
//
//===----------------------------------------------------------------------===//
 
/*
 * @file: DDAClient.cpp
 * @author: yesen
 * @date: 16 Feb 2015
 *
 * LICENSE
 *
 */
 
 
#include "Util/Options.h"
#include "Util/SVFUtil.h"
#include "MemoryModel/PointsTo.h"
 
#include "DDA/DDAClient.h"
#include "DDA/FlowDDA.h"
#include <iostream>
#include <iomanip>  // for std::setw
 
using namespace SVF;
using namespace SVFUtil;
 
 
void DDAClient::answerQueries(PointerAnalysis* pta)
{
 
    DDAStat* stat = static_cast<DDAStat*>(pta->getStat());
    u32_t vmrss = 0;
    u32_t vmsize = 0;
    SVFUtil::getMemoryUsageKB(&vmrss, &vmsize);
    stat->setMemUsageBefore(vmrss, vmsize);
 
    collectCandidateQueries(pta->getPAG());
 
    // We tell the compiler count is used as DBOUT ignores the statement on some builds.
    u32_t count = 0;
    (void)count;
    for (OrderedNodeSet::iterator nIter = candidateQueries.begin();
            nIter != candidateQueries.end(); ++nIter,++count)
    {
        const SVFVar* node = pta->getPAG()->getSVFVar(*nIter);
        if(pta->getPAG()->isValidTopLevelPtr(node))
        {
            DBOUT(DGENERAL,outs() << "\n@@Computing PointsTo for :" << node->getId() <<
                                     " [" << count + 1<< "/" << candidateQueries.size() << "]" << " \n");
            DBOUT(DDDA,outs() << "\n@@Computing PointsTo for :" << node->getId() <<
                                 " [" << count + 1<< "/" << candidateQueries.size() << "]" << " \n");
            setCurrentQueryPtr(node->getId());
            pta->computeDDAPts(node->getId());
        }
    }
 
    vmrss = vmsize = 0;
    SVFUtil::getMemoryUsageKB(&vmrss, &vmsize);
    stat->setMemUsageAfter(vmrss, vmsize);
}
 
OrderedNodeSet& FunptrDDAClient::collectCandidateQueries(SVFIR* p)
{
    setPAG(p);
    for(SVFIR::CallSiteToFunPtrMap::const_iterator it = pag->getIndirectCallsites().begin(),
            eit = pag->getIndirectCallsites().end(); it!=eit; ++it)
    {
        if (it->first->isVirtualCall())
        {
            const SVFVar* vtblPtr = it->first->getVtablePtr();
            assert(vtblPtr != nullptr && "not a vtable pointer?");
            NodeID vtblId = vtblPtr->getId();
            addCandidate(vtblId);
            vtableToCallSiteMap[vtblId] = it->first;
        }
        else
        {
            addCandidate(it->second);
        }
    }
    return candidateQueries;
}
 
void FunptrDDAClient::performStat(PointerAnalysis* pta)
{
 
    AndersenWaveDiff* ander = AndersenWaveDiff::createAndersenWaveDiff(pta->getPAG());
    u32_t totalCallsites = 0;
    u32_t morePreciseCallsites = 0;
    u32_t zeroTargetCallsites = 0;
    u32_t oneTargetCallsites = 0;
    u32_t twoTargetCallsites = 0;
    u32_t moreThanTwoCallsites = 0;
 
    for (VTablePtrToCallSiteMap::iterator nIter = vtableToCallSiteMap.begin();
            nIter != vtableToCallSiteMap.end(); ++nIter)
    {
        NodeID vtptr = nIter->first;
        const PointsTo& ddaPts = pta->getPts(vtptr);
        const PointsTo& anderPts = ander->getPts(vtptr);
 
        CallGraph* callgraph = ander->getCallGraph();
        const CallICFGNode* cbn = nIter->second;
 
        if(!callgraph->hasIndCSCallees(cbn))
        {
            //outs() << "virtual callsite has no callee" << *(nIter->second.getInstruction()) << "\n";
            continue;
        }
 
        const CallGraph::FunctionSet& callees = callgraph->getIndCSCallees(cbn);
        totalCallsites++;
        if(callees.size() == 0)
            zeroTargetCallsites++;
        else if(callees.size() == 1)
            oneTargetCallsites++;
        else if(callees.size() == 2)
            twoTargetCallsites++;
        else
            moreThanTwoCallsites++;
 
        if(ddaPts.count() >= anderPts.count() || ddaPts.empty())
            continue;
 
        Set<const FunObjVar*> ander_vfns;
        Set<const FunObjVar*> dda_vfns;
        ander->getVFnsFromPts(cbn,anderPts, ander_vfns);
        pta->getVFnsFromPts(cbn,ddaPts, dda_vfns);
 
        ++morePreciseCallsites;
        outs() << "============more precise callsite =================\n";
        outs() << (nIter->second)->toString() << "\n";
        outs() << (nIter->second)->getSourceLoc() << "\n";
        outs() << "\n";
        outs() << "------ander pts or vtable num---(" << anderPts.count()  << ")--\n";
        outs() << "------DDA vfn num---(" << ander_vfns.size() << ")--\n";
        //ander->dumpPts(vtptr, anderPts);
        outs() << "------DDA pts or vtable num---(" << ddaPts.count() << ")--\n";
        outs() << "------DDA vfn num---(" << dda_vfns.size() << ")--\n";
        //pta->dumpPts(vtptr, ddaPts);
        outs() << "-------------------------\n";
        outs() << "\n";
        outs() << "=================================================\n";
    }
 
    outs() << "=================================================\n";
    outs() << "Total virtual callsites: " << vtableToCallSiteMap.size() << "\n";
    outs() << "Total analyzed virtual callsites: " << totalCallsites << "\n";
    outs() << "Indirect call map size: " << ander->getCallGraph()->getIndCallMap().size() << "\n";
    outs() << "Precise callsites: " << morePreciseCallsites << "\n";
    outs() << "Zero target callsites: " << zeroTargetCallsites << "\n";
    outs() << "One target callsites: " << oneTargetCallsites << "\n";
    outs() << "Two target callsites: " << twoTargetCallsites << "\n";
    outs() << "More than two target callsites: " << moreThanTwoCallsites << "\n";
    outs() << "=================================================\n";
}
 

OrderedNodeSet& AliasDDAClient::collectCandidateQueries(SVFIR* pag)
{
    setPAG(pag);
    SVFStmt::SVFStmtSetTy& loads = pag->getSVFStmtSet(SVFStmt::Load);
    for (SVFStmt::SVFStmtSetTy::iterator iter = loads.begin(), eiter =
                loads.end(); iter != eiter; ++iter)
    {
        PAGNode* loadsrc = (*iter)->getSrcNode();
        loadSrcNodes.insert(loadsrc);
        addCandidate(loadsrc->getId());
    }
 
    SVFStmt::SVFStmtSetTy& stores = pag->getSVFStmtSet(SVFStmt::Store);
    for (SVFStmt::SVFStmtSetTy::iterator iter = stores.begin(), eiter =
                stores.end(); iter != eiter; ++iter)
    {
        PAGNode* storedst = (*iter)->getDstNode();
        storeDstNodes.insert(storedst);
        addCandidate(storedst->getId());
    }
    SVFStmt::SVFStmtSetTy& geps = pag->getSVFStmtSet(SVFStmt::Gep);
    for (SVFStmt::SVFStmtSetTy::iterator iter = geps.begin(), eiter =
                geps.end(); iter != eiter; ++iter)
    {
        PAGNode* gepsrc = (*iter)->getSrcNode();
        gepSrcNodes.insert(gepsrc);
        addCandidate(gepsrc->getId());
    }
    return candidateQueries;
}
 
void AliasDDAClient::performStat(PointerAnalysis* pta)
{
 
    for(PAGNodeSet::const_iterator lit = loadSrcNodes.begin(); lit!=loadSrcNodes.end(); lit++)
    {
        for(PAGNodeSet::const_iterator sit = storeDstNodes.begin(); sit!=storeDstNodes.end(); sit++)
        {
            const PAGNode* node1 = *lit;
            const PAGNode* node2 = *sit;
            AliasResult result = pta->alias(node1->getId(), node2->getId());
            outs() << "\n=================================================\n";
            outs() << "Alias Query for (" << node1->valueOnlyToString() << ",";
            outs() << node2->valueOnlyToString() << ") \n";
            outs() << "[NodeID:" << node1->getId() << ", NodeID:" << node2->getId() << " " << result << "]\n";
            outs() << "=================================================\n";
        }
    }
}