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Diffstat (limited to 'src/proof/ssw/sswBmc.c')
| -rw-r--r-- | src/proof/ssw/sswBmc.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/src/proof/ssw/sswBmc.c b/src/proof/ssw/sswBmc.c new file mode 100644 index 00000000..8cb14f4a --- /dev/null +++ b/src/proof/ssw/sswBmc.c @@ -0,0 +1,224 @@ +/**CFile**************************************************************** + + FileName [sswBmc.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [Inductive prover with constraints.] + + Synopsis [Bounded model checker using dynamic unrolling.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - September 1, 2008.] + + Revision [$Id: sswBmc.c,v 1.00 2008/09/01 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "sswInt.h" + +ABC_NAMESPACE_IMPL_START + + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Incrementally unroll the timeframes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Aig_Obj_t * Ssw_BmcUnroll_rec( Ssw_Frm_t * pFrm, Aig_Obj_t * pObj, int f ) +{ + Aig_Obj_t * pRes, * pRes0, * pRes1; + if ( (pRes = Ssw_ObjFrame_(pFrm, pObj, f)) ) + return pRes; + if ( Aig_ObjIsConst1(pObj) ) + pRes = Aig_ManConst1( pFrm->pFrames ); + else if ( Saig_ObjIsPi(pFrm->pAig, pObj) ) + pRes = Aig_ObjCreatePi( pFrm->pFrames ); + else if ( Aig_ObjIsPo(pObj) ) + { + Ssw_BmcUnroll_rec( pFrm, Aig_ObjFanin0(pObj), f ); + pRes = Ssw_ObjChild0Fra_( pFrm, pObj, f ); + } + else if ( Saig_ObjIsLo(pFrm->pAig, pObj) ) + { + if ( f == 0 ) + pRes = Aig_ManConst0( pFrm->pFrames ); + else + pRes = Ssw_BmcUnroll_rec( pFrm, Saig_ObjLoToLi(pFrm->pAig, pObj), f-1 ); + } + else + { + assert( Aig_ObjIsNode(pObj) ); + Ssw_BmcUnroll_rec( pFrm, Aig_ObjFanin0(pObj), f ); + Ssw_BmcUnroll_rec( pFrm, Aig_ObjFanin1(pObj), f ); + pRes0 = Ssw_ObjChild0Fra_( pFrm, pObj, f ); + pRes1 = Ssw_ObjChild1Fra_( pFrm, pObj, f ); + pRes = Aig_And( pFrm->pFrames, pRes0, pRes1 ); + } + Ssw_ObjSetFrame_( pFrm, pObj, f, pRes ); + return pRes; +} + +/**Function************************************************************* + + Synopsis [Derives counter-example.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Abc_Cex_t * Ssw_BmcGetCounterExample( Ssw_Frm_t * pFrm, Ssw_Sat_t * pSat, int iPo, int iFrame ) +{ + Abc_Cex_t * pCex; + Aig_Obj_t * pObj, * pObjFrames; + int f, i, nShift; + assert( Saig_ManRegNum(pFrm->pAig) > 0 ); + // allocate the counter example + pCex = Abc_CexAlloc( Saig_ManRegNum(pFrm->pAig), Saig_ManPiNum(pFrm->pAig), iFrame + 1 ); + pCex->iPo = iPo; + pCex->iFrame = iFrame; + // create data-bits + nShift = Saig_ManRegNum(pFrm->pAig); + for ( f = 0; f <= iFrame; f++, nShift += Saig_ManPiNum(pFrm->pAig) ) + Saig_ManForEachPi( pFrm->pAig, pObj, i ) + { + pObjFrames = Ssw_ObjFrame_(pFrm, pObj, f); + if ( pObjFrames == NULL ) + continue; + if ( Ssw_CnfGetNodeValue( pSat, pObjFrames ) ) + Abc_InfoSetBit( pCex->pData, nShift + i ); + } + return pCex; +} + + +/**Function************************************************************* + + Synopsis [Performs BMC for the given AIG.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Ssw_BmcDynamic( Aig_Man_t * pAig, int nFramesMax, int nConfLimit, int fVerbose, int * piFrame ) +{ + Ssw_Frm_t * pFrm; + Ssw_Sat_t * pSat; + Aig_Obj_t * pObj, * pObjFrame; + int status, clkPart, Lit, i, f, RetValue; + + // start managers + assert( Saig_ManRegNum(pAig) > 0 ); + Aig_ManSetPioNumbers( pAig ); + pSat = Ssw_SatStart( 0 ); + pFrm = Ssw_FrmStart( pAig ); + pFrm->pFrames = Aig_ManStart( Aig_ManObjNumMax(pAig) * 3 ); + // report statistics + if ( fVerbose ) + { + printf( "AIG: PI/PO/Reg = %d/%d/%d. Node = %6d. Lev = %5d.\n", + Saig_ManPiNum(pAig), Saig_ManPoNum(pAig), Saig_ManRegNum(pAig), + Aig_ManNodeNum(pAig), Aig_ManLevelNum(pAig) ); + fflush( stdout ); + } + // perform dynamic unrolling + RetValue = -1; + for ( f = 0; f < nFramesMax; f++ ) + { + clkPart = clock(); + Saig_ManForEachPo( pAig, pObj, i ) + { + // unroll the circuit for this output + Ssw_BmcUnroll_rec( pFrm, pObj, f ); + pObjFrame = Ssw_ObjFrame_( pFrm, pObj, f ); + Ssw_CnfNodeAddToSolver( pSat, Aig_Regular(pObjFrame) ); + status = sat_solver_simplify(pSat->pSat); + assert( status ); + // solve + Lit = toLitCond( Ssw_ObjSatNum(pSat,pObjFrame), Aig_IsComplement(pObjFrame) ); + if ( fVerbose ) + { + printf( "Solving output %2d of frame %3d ... \r", + i % Saig_ManPoNum(pAig), i / Saig_ManPoNum(pAig) ); + } + status = sat_solver_solve( pSat->pSat, &Lit, &Lit + 1, (ABC_INT64_T)nConfLimit, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 ); + if ( status == l_False ) + { +/* + Lit = lit_neg( Lit ); + RetValue = sat_solver_addclause( pSat->pSat, &Lit, &Lit + 1 ); + assert( RetValue ); + if ( pSat->pSat->qtail != pSat->pSat->qhead ) + { + RetValue = sat_solver_simplify(pSat->pSat); + assert( RetValue ); + } +*/ + RetValue = 1; + continue; + } + else if ( status == l_True ) + { + pAig->pSeqModel = Ssw_BmcGetCounterExample( pFrm, pSat, i, f ); + if ( piFrame ) + *piFrame = f; + RetValue = 0; + break; + } + else + { + if ( piFrame ) + *piFrame = f; + RetValue = -1; + break; + } + } + if ( fVerbose ) + { + printf( "Solved %2d outputs of frame %3d. ", Saig_ManPoNum(pAig), f ); + printf( "Conf =%8.0f. Var =%8d. AIG=%9d. ", + (double)pSat->pSat->stats.conflicts, + pSat->nSatVars, Aig_ManNodeNum(pFrm->pFrames) ); + ABC_PRT( "T", clock() - clkPart ); + clkPart = clock(); + fflush( stdout ); + } + if ( RetValue != 1 ) + break; + } + + Ssw_SatStop( pSat ); + Ssw_FrmStop( pFrm ); + return RetValue; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + +ABC_NAMESPACE_IMPL_END + |