intContain.c

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

  FileName    [intContain.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Interpolation engine.]

  Synopsis    [Interpolant containment checking.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

  Date        [Ver. 1.0. Started - June 24, 2008.]

  Revision    [$Id: intContain.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]

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

#include "intInt.h"
#include "fra.h"

ABC_NAMESPACE_IMPL_START

////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////

extern int Inter_ManCheckUniqueness( Aig_Man_t * p, sat_solver * pSat, Cnf_Dat_t * pCnf, int nFrames );

////////////////////////////////////////////////////////////////////////
///                     FUNCTION DEFINITIONS                         ///
////////////////////////////////////////////////////////////////////////

/**Function*************************************************************

  Synopsis    [Checks constainment of two interpolants.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Inter_ManCheckContainment( Aig_Man_t * pNew, Aig_Man_t * pOld )
{
    Aig_Man_t * pMiter, * pAigTemp;
    int RetValue;
    pMiter = Aig_ManCreateMiter( pNew, pOld, 1 );
//    pMiter = Dar_ManRwsat( pAigTemp = pMiter, 1, 0 );
//    Aig_ManStop( pAigTemp );
    RetValue = Fra_FraigMiterStatus( pMiter );
    if ( RetValue == -1 )
    {
        pAigTemp = Fra_FraigEquivence( pMiter, 1000000, 1 );
        RetValue = Fra_FraigMiterStatus( pAigTemp );
        Aig_ManStop( pAigTemp );
//        RetValue = Fra_FraigSat( pMiter, 1000000, 0, 0, 0, 0 );
    }
    assert( RetValue != -1 );
    Aig_ManStop( pMiter );
    return RetValue;
}

/**Function*************************************************************

  Synopsis    [Checks constainment of two interpolants.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Inter_ManCheckEquivalence( Aig_Man_t * pNew, Aig_Man_t * pOld )
{
    Aig_Man_t * pMiter, * pAigTemp;
    int RetValue;
    pMiter = Aig_ManCreateMiter( pNew, pOld, 0 );
//    pMiter = Dar_ManRwsat( pAigTemp = pMiter, 1, 0 );
//    Aig_ManStop( pAigTemp );
    RetValue = Fra_FraigMiterStatus( pMiter );
    if ( RetValue == -1 )
    {
        pAigTemp = Fra_FraigEquivence( pMiter, 1000000, 1 );
        RetValue = Fra_FraigMiterStatus( pAigTemp );
        Aig_ManStop( pAigTemp );
//        RetValue = Fra_FraigSat( pMiter, 1000000, 0, 0, 0, 0 );
    }
    assert( RetValue != -1 );
    Aig_ManStop( pMiter );
    return RetValue;
}


/**Function*************************************************************

  Synopsis    [Create timeframes of the manager for interpolation.]

  Description [The resulting manager is combinational. The primary inputs
  corresponding to register outputs are ordered first.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Aig_Man_t * Inter_ManFramesLatches( Aig_Man_t * pAig, int nFrames, Vec_Ptr_t ** pvMapReg )
{
    Aig_Man_t * pFrames;
    Aig_Obj_t * pObj, * pObjLi, * pObjLo;
    int i, f;
    assert( Saig_ManRegNum(pAig) > 0 );
    pFrames = Aig_ManStart( Aig_ManNodeNum(pAig) * nFrames );
    // map the constant node
    Aig_ManConst1(pAig)->pData = Aig_ManConst1( pFrames );
    // create variables for register outputs
    *pvMapReg = Vec_PtrAlloc( (nFrames+1) * Saig_ManRegNum(pAig) );
    Saig_ManForEachLo( pAig, pObj, i )
    {
        pObj->pData = Aig_ObjCreatePi( pFrames );
        Vec_PtrPush( *pvMapReg, pObj->pData );
    }
    // add timeframes
    for ( f = 0; f < nFrames; f++ )
    {
        // create PI nodes for this frame
        Saig_ManForEachPi( pAig, pObj, i )
            pObj->pData = Aig_ObjCreatePi( pFrames );
        // add internal nodes of this frame
        Aig_ManForEachNode( pAig, pObj, i )
            pObj->pData = Aig_And( pFrames, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
        // save register inputs
        Saig_ManForEachLi( pAig, pObj, i )
            pObj->pData = Aig_ObjChild0Copy(pObj);
        // transfer to register outputs
        Saig_ManForEachLiLo(  pAig, pObjLi, pObjLo, i )
        {
            pObjLo->pData = pObjLi->pData;
            Vec_PtrPush( *pvMapReg, pObjLo->pData );
        }
    }
    return pFrames;
}

/**Function*************************************************************

  Synopsis    [Duplicates AIG while mapping PIs into the given array.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Inter_ManAppendCone( Aig_Man_t * pOld, Aig_Man_t * pNew, Aig_Obj_t ** ppNewPis, int fCompl )
{
    Aig_Obj_t * pObj;
    int i;
    assert( Aig_ManPoNum(pOld) == 1 );
    // create the PIs
    Aig_ManCleanData( pOld );
    Aig_ManConst1(pOld)->pData = Aig_ManConst1(pNew);
    Aig_ManForEachPi( pOld, pObj, i )
        pObj->pData = ppNewPis[i];
    // duplicate internal nodes
    Aig_ManForEachNode( pOld, pObj, i )
        pObj->pData = Aig_And( pNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
    // add one PO to new
    pObj = Aig_ManPo( pOld, 0 );
    Aig_ObjCreatePo( pNew, Aig_NotCond( Aig_ObjChild0Copy(pObj), fCompl ) );
}


/**Function*************************************************************

  Synopsis    [Checks constainment of two interpolants inductively.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Inter_ManCheckInductiveContainment( Aig_Man_t * pTrans, Aig_Man_t * pInter, int nSteps, int fBackward )
{
    Aig_Man_t * pFrames;
    Aig_Obj_t ** ppNodes;
    Vec_Ptr_t * vMapRegs;
    Cnf_Dat_t * pCnf;
    sat_solver * pSat;
    int f, nRegs, status;
    nRegs = Saig_ManRegNum(pTrans);
    assert( nRegs > 0 );
    // generate the timeframes 
    pFrames = Inter_ManFramesLatches( pTrans, nSteps, &vMapRegs );
    assert( Vec_PtrSize(vMapRegs) == (nSteps + 1) * nRegs );
    // add main constraints to the timeframes
    ppNodes = (Aig_Obj_t **)Vec_PtrArray(vMapRegs);
    if ( !fBackward )
    { 
        // forward inductive check: p -> p -> ... -> !p
        for ( f = 0; f < nSteps; f++ )
            Inter_ManAppendCone( pInter, pFrames, ppNodes + f * nRegs, 0 );
        Inter_ManAppendCone( pInter, pFrames, ppNodes + f * nRegs, 1 );
    }
    else
    {
        // backward inductive check: p -> !p -> ... -> !p
        Inter_ManAppendCone( pInter, pFrames, ppNodes + 0 * nRegs, 1 );
        for ( f = 1; f <= nSteps; f++ )
            Inter_ManAppendCone( pInter, pFrames, ppNodes + f * nRegs, 0 );
    }
    Vec_PtrFree( vMapRegs );
    Aig_ManCleanup( pFrames );

    // convert to CNF
    pCnf = Cnf_Derive( pFrames, 0 ); 
    pSat = (sat_solver *)Cnf_DataWriteIntoSolver( pCnf, 1, 0 );
//    Cnf_DataFree( pCnf );
//    Aig_ManStop( pFrames );

    if ( pSat == NULL )
    {
        Cnf_DataFree( pCnf );
        Aig_ManStop( pFrames );
        return 1;
    }

     // solve the problem
    status = sat_solver_solve( pSat, NULL, NULL, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );

//    Inter_ManCheckUniqueness( pTrans, pSat, pCnf, nSteps );

    Cnf_DataFree( pCnf );
    Aig_ManStop( pFrames );

    sat_solver_delete( pSat );
    return status == l_False;
}
ABC_NAMESPACE_IMPL_END

#include "fra.h"

ABC_NAMESPACE_IMPL_START


/**Function*************************************************************

  Synopsis    [Check if cex satisfies uniqueness constraints.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Inter_ManCheckUniqueness( Aig_Man_t * p, sat_solver * pSat, Cnf_Dat_t * pCnf, int nFrames )
{
    extern int Fra_SmlNodesCompareInFrame( Fra_Sml_t * p, Aig_Obj_t * pObj0, Aig_Obj_t * pObj1, int iFrame0, int iFrame1 );
    extern void Fra_SmlAssignConst( Fra_Sml_t * p, Aig_Obj_t * pObj, int fConst1, int iFrame );
    extern void Fra_SmlSimulateOne( Fra_Sml_t * p );

    Fra_Sml_t * pSml;
    Vec_Int_t * vPis;
    Aig_Obj_t * pObj, * pObj0;
    int i, k, v, iBit, * pCounterEx;
    int Counter;
    if ( nFrames == 1 )
        return 1;
    if ( pSat->model.size == 0 )
        return 1;
//    assert( Saig_ManPoNum(p) == 1 );
    assert( Aig_ManRegNum(p) > 0 );
    assert( Aig_ManRegNum(p) < Aig_ManPiNum(p) );

    // get the counter-example
    vPis = Vec_IntAlloc( 100 );
    Aig_ManForEachPi( pCnf->pMan, pObj, k )
        Vec_IntPush( vPis, pCnf->pVarNums[Aig_ObjId(pObj)] );
    assert( Vec_IntSize(vPis) == Aig_ManRegNum(p) + nFrames * Saig_ManPiNum(p) );
    pCounterEx = Sat_SolverGetModel( pSat, vPis->pArray, vPis->nSize );
    Vec_IntFree( vPis );

    // start a new sequential simulator
    pSml = Fra_SmlStart( p, 0, nFrames, 1 );
    // assign simulation info for the registers
    iBit = 0;
    Aig_ManForEachLoSeq( p, pObj, i )
        Fra_SmlAssignConst( pSml, pObj, pCounterEx[iBit++], 0 );
    // assign simulation info for the primary inputs
    for ( i = 0; i < nFrames; i++ )
        Aig_ManForEachPiSeq( p, pObj, k )
            Fra_SmlAssignConst( pSml, pObj, pCounterEx[iBit++], i );
    assert( iBit == Aig_ManPiNum(pCnf->pMan) );
    // run simulation
    Fra_SmlSimulateOne( pSml );

    // check if the given output has failed
//    RetValue = !Fra_SmlNodeIsZero( pSml, Aig_ManPo(pAig, 0) );
//    assert( RetValue );

    // check values at the internal nodes
    Counter = 0;
    for ( i = 0; i < nFrames; i++ )
    for ( k = i+1; k < nFrames; k++ )
    {
        for ( v = 0; v < Aig_ManRegNum(p); v++ )
        {
            pObj0 = Aig_ManLo(p, v);
            if ( !Fra_SmlNodesCompareInFrame( pSml, pObj0, pObj0, i, k ) )
                break;
        }
        if ( v == Aig_ManRegNum(p) )
            Counter++;
    }
    printf( "Uniquness does not hold in %d frames.\n", Counter );

    Fra_SmlStop( pSml );
    ABC_FREE( pCounterEx );
    return 1;
}

////////////////////////////////////////////////////////////////////////
///                       END OF FILE                                ///
////////////////////////////////////////////////////////////////////////


ABC_NAMESPACE_IMPL_END