kliveness.c

Go to the documentation of this file.

/**CFile****************************************************************

  FileName    [kliveness.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Liveness property checking.]

  Synopsis      [Main implementation module of the algorithm k-Liveness ] 
            [invented by Koen Claessen, Niklas Sorensson. Implements]
            [the code for 'kcs'. 'kcs' pre-processes based on switch]
        [and then runs the (absorber circuit >> pdr) loop  ]

  Author      [Sayak Ray]
  
  Affiliation [UC Berkeley]

  Date        [Ver. 1.0. Started - October 31, 2012.]

***********************************************************************/

#include <stdio.h>
#include "base/main/main.h"
#include "aig/aig/aig.h"
#include "aig/saig/saig.h"
#include <string.h>
#include "base/main/mainInt.h"
#include "proof/pdr/pdr.h"
#include <time.h>

//#define WITHOUT_CONSTRAINTS

ABC_NAMESPACE_IMPL_START

/***************** Declaration of standard ABC related functions ********************/
extern Aig_Man_t * Abc_NtkToDar( Abc_Ntk_t * pNtk, int fExors, int fRegisters );
extern Abc_Ntk_t * Abc_NtkFromAigPhase( Aig_Man_t * pMan );
extern Abc_Ntk_t * Abc_NtkMakeOnePo( Abc_Ntk_t * pNtk, int Output, int nRange );
extern void Aig_ManDumpBlif( Aig_Man_t * p, char * pFileName, Vec_Ptr_t * vPiNames, Vec_Ptr_t * vPoNames );
/***********************************************************************************/

/***************** Declaration of kLiveness related functions **********************/
//function defined in kLiveConstraints.c
extern Aig_Man_t *generateWorkingAig( Aig_Man_t *pAig, Abc_Ntk_t *pNtk, int *pIndex0Live );

//function defined in arenaViolation.c
extern Aig_Man_t *generateWorkingAigWithDSC( Aig_Man_t *pAig, Abc_Ntk_t *pNtk, int *pIndex0Live, Vec_Ptr_t *vMasterBarriers );

//function defined in disjunctiveMonotone.c
extern Vec_Ptr_t *findDisjunctiveMonotoneSignals( Abc_Ntk_t *pNtk );
extern Vec_Int_t *createSingletonIntVector( int i );
/***********************************************************************************/
extern Aig_Man_t *generateDisjunctiveTester( Abc_Ntk_t *pNtk, Aig_Man_t *pAig, int combN, int combK );
extern Aig_Man_t *generateGeneralDisjunctiveTester( Abc_Ntk_t *pNtk, Aig_Man_t *pAig, int combK );

//Definition of some macros pertaining to modes/switches
#define SIMPLE_kCS 0
#define kCS_WITH_SAFETY_INVARIANTS 1
#define kCS_WITH_DISCOVER_MONOTONE_SIGNALS 2
#define kCS_WITH_SAFETY_AND_DCS_INVARIANTS 3
#define kCS_WITH_SAFETY_AND_USER_GIVEN_DCS_INVARIANTS 4

//unused function
#if 0
Aig_Obj_t *readTargetPinSignal(Aig_Man_t *pAig, Abc_Ntk_t *pNtk)
{
    Aig_Obj_t *pObj;
    int i;

    Saig_ManForEachPo( pAig, pObj, i )
    {
        if( strstr( Abc_ObjName(Abc_NtkPo( pNtk, i )), "0Liveness_" ) != NULL  )
        {
            //return Aig_ObjFanin0(pObj);
            return Aig_NotCond((Aig_Obj_t *)Aig_ObjFanin0(pObj), Aig_ObjFaninC0(pObj));
        }
    }   

    return NULL;
}
#endif

Aig_Obj_t *readLiveSignal_0( Aig_Man_t *pAig, int liveIndex_0 )
{
    Aig_Obj_t *pObj;

    pObj = Aig_ManCo( pAig, liveIndex_0 );
    return Aig_NotCond((Aig_Obj_t *)Aig_ObjFanin0(pObj), Aig_ObjFaninC0(pObj));
}

Aig_Obj_t *readLiveSignal_k( Aig_Man_t *pAig, int liveIndex_k )
{
    Aig_Obj_t *pObj;

    pObj = Aig_ManCo( pAig, liveIndex_k );
    return Aig_NotCond((Aig_Obj_t *)Aig_ObjFanin0(pObj), Aig_ObjFaninC0(pObj));
}

//unused funtion
#if 0
Aig_Obj_t *readTargetPoutSignal(Aig_Man_t *pAig, Abc_Ntk_t *pNtk, int nonFirstIteration)
{
    Aig_Obj_t *pObj;
    int i;

    if( nonFirstIteration == 0 )
        return NULL;
    else
        Saig_ManForEachPo( pAig, pObj, i )
        {
            if( strstr( Abc_ObjName(Abc_NtkPo( pNtk, i )), "kLiveness_" ) != NULL  )
            {
                //return Aig_ObjFanin0(pObj);
                return Aig_NotCond((Aig_Obj_t *)Aig_ObjFanin0(pObj), Aig_ObjFaninC0(pObj));
            }
        }   

    return NULL;
}
#endif

//unused function
#if 0
void updateNewNetworkNameManager_kCS( Abc_Ntk_t *pNtk, Aig_Man_t *pAig, Vec_Ptr_t *vPiNames, 
            Vec_Ptr_t *vLoNames, Vec_Ptr_t *vPoNames, Vec_Ptr_t *vLiNames )
{
    Aig_Obj_t *pObj;
    Abc_Obj_t *pNode;
    int i, ntkObjId;

    pNtk->pManName = Nm_ManCreate( Abc_NtkCiNum( pNtk ) );

    if( vPiNames )
    {
        Saig_ManForEachPi( pAig, pObj, i )
        {
            ntkObjId = Abc_NtkCi( pNtk, i )->Id;
            Nm_ManStoreIdName( pNtk->pManName, ntkObjId, Aig_ObjType(pObj), (char *)Vec_PtrEntry(vPiNames, i), NULL );
        }
    }
    if( vLoNames )
    {
        Saig_ManForEachLo( pAig, pObj, i )
        {
            ntkObjId = Abc_NtkCi( pNtk, Saig_ManPiNum( pAig ) + i )->Id;
            Nm_ManStoreIdName( pNtk->pManName, ntkObjId, Aig_ObjType(pObj), (char *)Vec_PtrEntry(vLoNames, i), NULL );
        }
    }

    if( vPoNames )
    {
        Saig_ManForEachPo( pAig, pObj, i )
        {
            ntkObjId = Abc_NtkCo( pNtk, i )->Id;
            Nm_ManStoreIdName( pNtk->pManName, ntkObjId, Aig_ObjType(pObj), (char *)Vec_PtrEntry(vPoNames, i), NULL );  
        }
    }

    if( vLiNames )
    {
        Saig_ManForEachLi( pAig, pObj, i )
        {
            ntkObjId = Abc_NtkCo( pNtk, Saig_ManPoNum( pAig ) + i )->Id;
            Nm_ManStoreIdName( pNtk->pManName, ntkObjId, Aig_ObjType(pObj), (char *)Vec_PtrEntry(vLiNames, i), NULL );
        }
    }

    // assign latch input names
    Abc_NtkForEachLatch(pNtk, pNode, i)
        if ( Nm_ManFindNameById(pNtk->pManName, Abc_ObjFanin0(pNode)->Id) == NULL )
            Abc_ObjAssignName( Abc_ObjFanin0(pNode), Abc_ObjName(Abc_ObjFanin0(pNode)), NULL );
}
#endif

Aig_Man_t *introduceAbsorberLogic( Aig_Man_t *pAig, int *pLiveIndex_0, int *pLiveIndex_k, int nonFirstIteration )
{
    Aig_Man_t *pNewAig;
    Aig_Obj_t *pObj, *pObjAbsorberLo, *pPInNewArg, *pPOutNewArg;
    Aig_Obj_t *pPIn = NULL, *pPOut = NULL, *pPOutCo = NULL;
    Aig_Obj_t *pFirstAbsorberOr, *pSecondAbsorberOr;
    int i;
    int piCopied = 0, loCreated = 0, loCopied = 0, liCreated = 0, liCopied = 0; 
    int nRegCount;

    assert(*pLiveIndex_0 != -1);
    if(nonFirstIteration == 0)
        assert( *pLiveIndex_k == -1 );
    else
        assert( *pLiveIndex_k != -1  );

    //****************************************************************
    // Step1: create the new manager
    // Note: The new manager is created with "2 * Aig_ManObjNumMax(p)"
    // nodes, but this selection is arbitrary - need to be justified
    //****************************************************************
    pNewAig = Aig_ManStart( Aig_ManObjNumMax(pAig) );
    pNewAig->pName = (char *)malloc( strlen( pAig->pName ) + strlen("_kCS") + 1 );
    sprintf(pNewAig->pName, "%s_%s", pAig->pName, "kCS");
        pNewAig->pSpec = NULL;

    //****************************************************************
    // reading the signal pIn, and pOut
    //****************************************************************

    pPIn = readLiveSignal_0( pAig, *pLiveIndex_0 );
    if( *pLiveIndex_k == -1 )
        pPOut = NULL;
    else
        pPOut = readLiveSignal_k( pAig, *pLiveIndex_k );
    
    //****************************************************************
    // Step 2: map constant nodes
    //****************************************************************
        pObj = Aig_ManConst1( pAig );
        pObj->pData = Aig_ManConst1( pNewAig );

    //****************************************************************
        // Step 3: create true PIs
    //****************************************************************
        Saig_ManForEachPi( pAig, pObj, i )
    {
        piCopied++;
        pObj->pData = Aig_ObjCreateCi(pNewAig);
    }

    //****************************************************************
    // Step 5: create register outputs
    //****************************************************************
        Saig_ManForEachLo( pAig, pObj, i )
        {
        loCopied++;
        pObj->pData = Aig_ObjCreateCi(pNewAig);
        }

    //****************************************************************
    // Step 6: create "D" register output for the ABSORBER logic
    //****************************************************************
    loCreated++;
    pObjAbsorberLo = Aig_ObjCreateCi( pNewAig );

    nRegCount = loCreated + loCopied;

    //********************************************************************
    // Step 7: create internal nodes
    //********************************************************************
        Aig_ManForEachNode( pAig, pObj, i )
    {
        pObj->pData = Aig_And( pNewAig, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
    }

    //****************************************************************
    // Step 8: create the two OR gates of the OBSERVER logic
    //****************************************************************
    if( nonFirstIteration == 0 )
    {
        assert(pPIn);
        
        pPInNewArg = !Aig_IsComplement(pPIn)? 
                (Aig_Obj_t *)((Aig_Regular(pPIn))->pData) : 
                Aig_Not((Aig_Obj_t *)((Aig_Regular(pPIn))->pData));

        pFirstAbsorberOr = Aig_Or( pNewAig, Aig_Not(pPInNewArg), pObjAbsorberLo );
        pSecondAbsorberOr = Aig_Or( pNewAig, pPInNewArg, Aig_Not(pObjAbsorberLo) );
    }
    else
    {
        assert( pPOut );

        pPInNewArg = !Aig_IsComplement(pPIn)? 
                (Aig_Obj_t *)((Aig_Regular(pPIn))->pData) : 
                Aig_Not((Aig_Obj_t *)((Aig_Regular(pPIn))->pData));
        pPOutNewArg = !Aig_IsComplement(pPOut)? 
                (Aig_Obj_t *)((Aig_Regular(pPOut))->pData) : 
                Aig_Not((Aig_Obj_t *)((Aig_Regular(pPOut))->pData));
        
        pFirstAbsorberOr = Aig_Or( pNewAig, Aig_Not(pPOutNewArg), pObjAbsorberLo );
        pSecondAbsorberOr = Aig_Or( pNewAig, pPInNewArg, Aig_Not(pObjAbsorberLo) );
    }   
    
    //********************************************************************
    // Step 9: create primary outputs 
    //********************************************************************
    Saig_ManForEachPo( pAig, pObj, i )
    {
        pObj->pData = Aig_ObjCreateCo( pNewAig, Aig_ObjChild0Copy(pObj) ); 
        if( i == *pLiveIndex_k )
            pPOutCo = (Aig_Obj_t *)(pObj->pData);
    }

    //create new po
    if( nonFirstIteration == 0 )
    {
        assert(pPOutCo == NULL);
        pPOutCo = Aig_ObjCreateCo( pNewAig, pSecondAbsorberOr );    

        *pLiveIndex_k = i;
    }   
    else
    {
        assert( pPOutCo != NULL );
        //pPOutCo = Aig_ObjCreateCo( pNewAig, pSecondAbsorberOr );  
        //*pLiveIndex_k = Saig_ManPoNum(pAig);

        Aig_ObjPatchFanin0( pNewAig, pPOutCo, pSecondAbsorberOr );
    }

    Saig_ManForEachLi( pAig, pObj, i )
    {
        liCopied++;
        Aig_ObjCreateCo( pNewAig, Aig_ObjChild0Copy(pObj) );
    }

    //create new li
    liCreated++;
    Aig_ObjCreateCo( pNewAig, pFirstAbsorberOr );

    Aig_ManSetRegNum( pNewAig, nRegCount );
    Aig_ManCleanup( pNewAig );
    
    assert( Aig_ManCheck( pNewAig ) );

    assert( *pLiveIndex_k != - 1);
    return pNewAig;
}

void modifyAigToApplySafetyInvar(Aig_Man_t *pAig, int csTarget, int safetyInvarPO)
{
    Aig_Obj_t *pObjPOSafetyInvar, *pObjSafetyInvar;
    Aig_Obj_t *pObjPOCSTarget, *pObjCSTarget;
    Aig_Obj_t *pObjCSTargetNew;

    pObjPOSafetyInvar = Aig_ManCo( pAig, safetyInvarPO );
    pObjSafetyInvar =  Aig_NotCond((Aig_Obj_t *)Aig_ObjFanin0(pObjPOSafetyInvar), Aig_ObjFaninC0(pObjPOSafetyInvar));   
    pObjPOCSTarget = Aig_ManCo( pAig, csTarget );
    pObjCSTarget = Aig_NotCond((Aig_Obj_t *)Aig_ObjFanin0(pObjPOCSTarget), Aig_ObjFaninC0(pObjPOCSTarget)); 

    pObjCSTargetNew = Aig_And( pAig, pObjSafetyInvar, pObjCSTarget );
    Aig_ObjPatchFanin0( pAig, pObjPOCSTarget, pObjCSTargetNew );
}

int flipConePdr( Aig_Man_t *pAig, int directive, int targetCSPropertyIndex, int safetyInvariantPOIndex, int absorberCount )
{
    int RetValue, i;
    Aig_Obj_t *pObjTargetPo;
    Aig_Man_t *pAigDupl;
    Pdr_Par_t Pars, * pPars = &Pars;
    Abc_Cex_t * pCex = NULL;

    char *fileName;
    
    fileName = (char *)malloc(sizeof(char) * 50);
    sprintf(fileName, "%s_%d.%s", "kLive", absorberCount, "blif" );

    if( directive == kCS_WITH_SAFETY_INVARIANTS || directive == kCS_WITH_SAFETY_AND_DCS_INVARIANTS || directive == kCS_WITH_SAFETY_AND_USER_GIVEN_DCS_INVARIANTS )
    {
        assert( safetyInvariantPOIndex != -1 );
        modifyAigToApplySafetyInvar(pAig, targetCSPropertyIndex, safetyInvariantPOIndex);
    }

    pAigDupl = pAig;
    pAig = Aig_ManDupSimple( pAigDupl );

    for( i=0; i<Saig_ManPoNum(pAig); i++ )
    {
        pObjTargetPo = Aig_ManCo( pAig, i );
        Aig_ObjChild0Flip( pObjTargetPo );
    }

    Pdr_ManSetDefaultParams( pPars );
    pPars->fVerbose = 1;
    pPars->fNotVerbose = 1;
    pPars->fSolveAll = 1;
    pAig->vSeqModelVec = NULL;

    Aig_ManCleanup( pAig );
    assert( Aig_ManCheck( pAig ) );

    Pdr_ManSolve( pAig, pPars );    

    if( pAig->vSeqModelVec )
    {
        pCex = (Abc_Cex_t *)Vec_PtrEntry( pAig->vSeqModelVec, targetCSPropertyIndex );
        if( pCex == NULL )
        {
            RetValue = 1;
        }
        else
            RetValue = 0;
    }
    else
    {
        RetValue = -1;
        exit(0);
    }

    free(fileName);

    for( i=0; i<Saig_ManPoNum(pAig); i++ )
    {
        pObjTargetPo = Aig_ManCo( pAig, i );
        Aig_ObjChild0Flip( pObjTargetPo );
    }
    
    Aig_ManStop( pAig );
    return RetValue;
}

//unused function
#if 0
int read0LiveIndex( Abc_Ntk_t *pNtk )
{
    Abc_Obj_t *pObj;
    int i;

    Abc_NtkForEachPo( pNtk, pObj, i )
    {
        if( strstr( Abc_ObjName( pObj ), "0Liveness_" ) != NULL )
            return i;
    }       

    return -1;
}
#endif

int collectSafetyInvariantPOIndex(Abc_Ntk_t *pNtk)
{
    Abc_Obj_t *pObj;
    int i;

    Abc_NtkForEachPo( pNtk, pObj, i )
    {
        if( strstr( Abc_ObjName( pObj ), "csSafetyInvar_" ) != NULL )
            return i;
    }       

    return -1;
}

Vec_Ptr_t *collectUserGivenDisjunctiveMonotoneSignals( Abc_Ntk_t *pNtk )
{
    Abc_Obj_t *pObj;
    int i;
    Vec_Ptr_t *monotoneVector;
    Vec_Int_t *newIntVector;

    monotoneVector = Vec_PtrAlloc(0);   
    Abc_NtkForEachPo( pNtk, pObj, i )
    {
        if( strstr( Abc_ObjName( pObj ), "csLevel1Stabil_" ) != NULL )
        {
            newIntVector = createSingletonIntVector(i);
            Vec_PtrPush(monotoneVector, newIntVector);
        }
    }

    if( Vec_PtrSize(monotoneVector) > 0 )
        return monotoneVector;
    else
        return NULL;

}

void deallocateMasterBarrierDisjunctInt(Vec_Ptr_t *vMasterBarrierDisjunctsArg)
{
    Vec_Int_t *vInt;
    int i;

    if(vMasterBarrierDisjunctsArg)
    {
        Vec_PtrForEachEntry(Vec_Int_t *, vMasterBarrierDisjunctsArg, vInt, i)
        {   
            Vec_IntFree(vInt);
        }
        Vec_PtrFree(vMasterBarrierDisjunctsArg);
    }
}

void deallocateMasterBarrierDisjunctVecPtrVecInt(Vec_Ptr_t *vMasterBarrierDisjunctsArg)
{
    Vec_Int_t *vInt;
    Vec_Ptr_t *vPtr;
    int i, j, k, iElem;

    if(vMasterBarrierDisjunctsArg)
    {
        Vec_PtrForEachEntry(Vec_Ptr_t *, vMasterBarrierDisjunctsArg, vPtr, i)
        {   
            assert(vPtr);
            Vec_PtrForEachEntry( Vec_Int_t *, vPtr, vInt, j )
            {
                //Vec_IntFree(vInt);
                Vec_IntForEachEntry( vInt, iElem, k )
                    printf("%d - ", iElem);
                //printf("Chung Chang j = %d\n", j);
            }
            Vec_PtrFree(vPtr);
        }
        Vec_PtrFree(vMasterBarrierDisjunctsArg);
    }
}

Vec_Ptr_t *getVecOfVecFairness(FILE *fp)
{
    Vec_Ptr_t *masterVector = Vec_PtrAlloc(0);
    //Vec_Ptr_t *currSignalVector;
    char stringBuffer[100];
    //int i;
    
    while(fgets(stringBuffer, 50, fp))
    {
        if(strstr(stringBuffer, ":"))
        {

        }
        else
        {
                
        }
    }

    return masterVector;
}


int Abc_CommandCS_kLiveness( Abc_Frame_t * pAbc, int argc, char ** argv )
{
        Abc_Ntk_t * pNtk, * pNtkTemp;
    Aig_Man_t * pAig, *pAigCS, *pAigCSNew;
    int absorberCount;
    int absorberLimit = 500;
    int RetValue;
    int liveIndex_0 = -1, liveIndex_k = -1;
    int fVerbose = 1;
    int directive = -1;
    int c;
    int safetyInvariantPO = -1;
    abctime beginTime, endTime;
    double time_spent;
    Vec_Ptr_t *vMasterBarrierDisjuncts = NULL;
    Aig_Man_t *pWorkingAig;
    //FILE *fp;

    pNtk = Abc_FrameReadNtk(pAbc);

    //fp = fopen("propFile.txt", "r");
    //if( fp )
    //  getVecOfVecFairness(fp);
    //exit(0);

    /*************************************************
    Extraction of Command Line Argument 
    *************************************************/
    if( argc == 1 )
    {
        assert( directive == -1 );
        directive = SIMPLE_kCS;
    }
    else
    {
        Extra_UtilGetoptReset();
        while ( ( c = Extra_UtilGetopt( argc, argv, "cmCgh" ) ) != EOF )
        {
            switch( c )
            {
            case 'c':
                directive = kCS_WITH_SAFETY_INVARIANTS; 
                break;
            case 'm':
                directive = kCS_WITH_DISCOVER_MONOTONE_SIGNALS; 
                break;
            case 'C':
                directive = kCS_WITH_SAFETY_AND_DCS_INVARIANTS;
                break;
            case 'g':
                directive = kCS_WITH_SAFETY_AND_USER_GIVEN_DCS_INVARIANTS;
                break;
            case 'h':
                goto usage;
                break;
            default:
                goto usage;
            }
        }
    }
    /*************************************************
    Extraction of Command Line Argument Ends    
    *************************************************/

    if( !Abc_NtkIsStrash( pNtk ) )
    {
        printf("The input network was not strashed, strashing....\n");
        pNtkTemp = Abc_NtkStrash( pNtk, 0, 0, 0 );
        pAig = Abc_NtkToDar( pNtkTemp, 0, 1 );
    }
    else
    {
        pAig = Abc_NtkToDar( pNtk, 0, 1 );
        pNtkTemp = pNtk;
    }

    if( directive == kCS_WITH_SAFETY_INVARIANTS )
    {
        safetyInvariantPO = collectSafetyInvariantPOIndex(pNtkTemp);            
        assert( safetyInvariantPO != -1 );
    }

    if(directive == kCS_WITH_DISCOVER_MONOTONE_SIGNALS)
    {
        beginTime = Abc_Clock();
        vMasterBarrierDisjuncts = findDisjunctiveMonotoneSignals( pNtk );
        endTime = Abc_Clock();
        time_spent = (double)(endTime - beginTime)/CLOCKS_PER_SEC;
        printf("pre-processing time = %f\n",time_spent); 
        return 0;
    }

    if(directive == kCS_WITH_SAFETY_AND_DCS_INVARIANTS)
    {
        safetyInvariantPO = collectSafetyInvariantPOIndex(pNtkTemp);            
        assert( safetyInvariantPO != -1 );

        beginTime = Abc_Clock();
        vMasterBarrierDisjuncts = findDisjunctiveMonotoneSignals( pNtk );
        endTime = Abc_Clock();
        time_spent = (double)(endTime - beginTime)/CLOCKS_PER_SEC;
        printf("pre-processing time = %f\n",time_spent); 

        assert( vMasterBarrierDisjuncts != NULL );
        assert( Vec_PtrSize(vMasterBarrierDisjuncts) > 0 );
    }

    if(directive == kCS_WITH_SAFETY_AND_USER_GIVEN_DCS_INVARIANTS)
    {
        safetyInvariantPO = collectSafetyInvariantPOIndex(pNtkTemp);            
        assert( safetyInvariantPO != -1 );

        beginTime = Abc_Clock();
        vMasterBarrierDisjuncts = collectUserGivenDisjunctiveMonotoneSignals( pNtk );
        endTime = Abc_Clock();
        time_spent = (double)(endTime - beginTime)/CLOCKS_PER_SEC;
        printf("pre-processing time = %f\n",time_spent); 

        assert( vMasterBarrierDisjuncts != NULL );
        assert( Vec_PtrSize(vMasterBarrierDisjuncts) > 0 );
    }

    if(directive == kCS_WITH_SAFETY_AND_DCS_INVARIANTS || directive == kCS_WITH_SAFETY_AND_USER_GIVEN_DCS_INVARIANTS)
    {
        assert( vMasterBarrierDisjuncts != NULL );
        pWorkingAig = generateWorkingAigWithDSC( pAig, pNtk, &liveIndex_0, vMasterBarrierDisjuncts );
        pAigCS = introduceAbsorberLogic(pWorkingAig, &liveIndex_0, &liveIndex_k, 0);
    }
    else
    {
        pWorkingAig = generateWorkingAig( pAig, pNtk, &liveIndex_0 );
        pAigCS = introduceAbsorberLogic(pWorkingAig, &liveIndex_0, &liveIndex_k, 0);
    }

    Aig_ManStop(pWorkingAig);

    for( absorberCount=1; absorberCount<absorberLimit; absorberCount++ )
    {
        //printf( "\nindex of the liveness output = %d\n", liveIndex_k );
        RetValue = flipConePdr( pAigCS, directive, liveIndex_k, safetyInvariantPO, absorberCount );

        if ( RetValue == 1 )
        {
                Abc_Print( 1, "k = %d, Property proved\n", absorberCount );
            break;
        }
            else if ( RetValue == 0 )
        {
            if( fVerbose )
            {
                Abc_Print( 1, "k = %d, Property DISPROVED\n", absorberCount );
            }
        }
            else if ( RetValue == -1 )
        {
                Abc_Print( 1, "Property UNDECIDED with k = %d.\n", absorberCount );
        }
            else
                assert( 0 );

        pAigCSNew = introduceAbsorberLogic(pAigCS, &liveIndex_0, &liveIndex_k, absorberCount);
        Aig_ManStop(pAigCS);
        pAigCS = pAigCSNew;
    }

    Aig_ManStop(pAigCS);
    Aig_ManStop(pAig);

    if(directive == kCS_WITH_SAFETY_AND_USER_GIVEN_DCS_INVARIANTS)
    {
        deallocateMasterBarrierDisjunctInt(vMasterBarrierDisjuncts);
    }
    else
    {
        //if(vMasterBarrierDisjuncts)
        //  Vec_PtrFree(vMasterBarrierDisjuncts);
        //deallocateMasterBarrierDisjunctVecPtrVecInt(vMasterBarrierDisjuncts);
        deallocateMasterBarrierDisjunctInt(vMasterBarrierDisjuncts);
    }
    return 0;

    usage:
        fprintf( stdout, "usage: kcs [-cmgCh]\n" );
            fprintf( stdout, "\timplements Claessen-Sorensson's k-Liveness algorithm\n" );
        fprintf( stdout, "\t-c : verification with constraints, looks for POs prefixed with csSafetyInvar_\n");
        fprintf( stdout, "\t-m : discovers monotone signals\n");
            fprintf( stdout, "\t-g : verification with user-supplied barriers, looks for POs prefixed with csLevel1Stabil_\n");
        fprintf( stdout, "\t-C : verification with discovered monotone signals\n");
        fprintf( stdout, "\t-h : print usage\n");
            return 1;

}

int Abc_CommandNChooseK( Abc_Frame_t * pAbc, int argc, char ** argv )
{
    Abc_Ntk_t * pNtk, * pNtkTemp, *pNtkCombStabil;
    Aig_Man_t * pAig, *pAigCombStabil;
    int directive = -1;
    int c;
    int parameterizedCombK;

    pNtk = Abc_FrameReadNtk(pAbc);


    /*************************************************
    Extraction of Command Line Argument 
    *************************************************/
    if( argc == 1 )
    {
        assert( directive == -1 );
        directive = SIMPLE_kCS;
    }
    else
    {
        Extra_UtilGetoptReset();
        while ( ( c = Extra_UtilGetopt( argc, argv, "cmCgh" ) ) != EOF )
        {
            switch( c )
            {
            case 'c':
                directive = kCS_WITH_SAFETY_INVARIANTS; 
                break;
            case 'm':
                directive = kCS_WITH_DISCOVER_MONOTONE_SIGNALS; 
                break;
            case 'C':
                directive = kCS_WITH_SAFETY_AND_DCS_INVARIANTS;
                break;
            case 'g':
                directive = kCS_WITH_SAFETY_AND_USER_GIVEN_DCS_INVARIANTS;
                break;
            case 'h':
                goto usage;
                break;
            default:
                goto usage;
            }
        }
    }
    /*************************************************
    Extraction of Command Line Argument Ends    
    *************************************************/

    if( !Abc_NtkIsStrash( pNtk ) )
    {
        printf("The input network was not strashed, strashing....\n");
        pNtkTemp = Abc_NtkStrash( pNtk, 0, 0, 0 );
        pAig = Abc_NtkToDar( pNtkTemp, 0, 1 );
    }
    else
    {
        pAig = Abc_NtkToDar( pNtk, 0, 1 );
        pNtkTemp = pNtk;
    }

/**********************Code for generation of nCk outputs**/
    //combCount = countCombination(1000, 3);
    //pAigCombStabil = generateDisjunctiveTester( pNtk, pAig, 7, 2 );
    printf("Enter parameterizedCombK = " );
    if( scanf("%d", &parameterizedCombK) != 1 )
    {
        printf("\nFailed to read integer!\n");
        return 0;
    }
    printf("\n");

    pAigCombStabil = generateGeneralDisjunctiveTester( pNtk, pAig, parameterizedCombK );
    Aig_ManPrintStats(pAigCombStabil);
    pNtkCombStabil = Abc_NtkFromAigPhase( pAigCombStabil );
    pNtkCombStabil->pName = Abc_UtilStrsav( pAigCombStabil->pName );
    if ( !Abc_NtkCheck( pNtkCombStabil ) )
            fprintf( stdout, "Abc_NtkCreateCone(): Network check has failed.\n" );
    Abc_FrameSetCurrentNetwork( pAbc, pNtkCombStabil );

    Aig_ManStop( pAigCombStabil );
    Aig_ManStop( pAig );

    return 1;
    //printf("\ncombCount = %d\n", combCount);
    //exit(0);
/**********************************************************/

    usage:
        fprintf( stdout, "usage: nck [-cmgCh]\n" );
            fprintf( stdout, "\tgenerates combinatorial signals for stabilization\n" );
        fprintf( stdout, "\t-h : print usage\n");
            return 1;

}


ABC_NAMESPACE_IMPL_END