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Diffstat (limited to 'src/aig/llb/llb4Cex.c')
| -rw-r--r-- | src/aig/llb/llb4Cex.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/src/aig/llb/llb4Cex.c b/src/aig/llb/llb4Cex.c new file mode 100644 index 00000000..e63b48f3 --- /dev/null +++ b/src/aig/llb/llb4Cex.c @@ -0,0 +1,191 @@ +/**CFile**************************************************************** + + FileName [llb2Cex.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [BDD based reachability.] + + Synopsis [Non-linear quantification scheduling.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: llb2Cex.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "llbInt.h" +#include "cnf.h" +#include "satSolver.h" + +ABC_NAMESPACE_IMPL_START + + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Translates a sequence of states into a counter-example.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Abc_Cex_t * Llb4_Nonlin4TransformCex( Aig_Man_t * pAig, Vec_Ptr_t * vStates, int fVerbose ) +{ + Abc_Cex_t * pCex; + Cnf_Dat_t * pCnf; + Vec_Int_t * vAssumps; + sat_solver * pSat; + Aig_Obj_t * pObj; + unsigned * pNext, * pThis; + int i, k, iBit, status, nRegs, clk = clock(); +/* + Vec_PtrForEachEntry( unsigned *, vStates, pNext, i ) + { + printf( "%4d : ", i ); + Extra_PrintBinary( stdout, pNext, Aig_ManRegNum(pAig) ); + printf( "\n" ); + } +*/ + // derive SAT solver + nRegs = Aig_ManRegNum(pAig); pAig->nRegs = 0; + pCnf = Cnf_Derive( pAig, Aig_ManPoNum(pAig) ); + pAig->nRegs = nRegs; +// Cnf_DataTranformPolarity( pCnf, 0 ); + // convert into SAT solver + pSat = (sat_solver *)Cnf_DataWriteIntoSolver( pCnf, 1, 0 ); + if ( pSat == NULL ) + { + printf( "Llb4_Nonlin4TransformCex(): Counter-example generation has failed.\n" ); + Cnf_DataFree( pCnf ); + return NULL; + } + // simplify the problem + status = sat_solver_simplify(pSat); + if ( status == 0 ) + { + printf( "Llb4_Nonlin4TransformCex(): SAT solver is invalid.\n" ); + sat_solver_delete( pSat ); + Cnf_DataFree( pCnf ); + return NULL; + } + // start the counter-example + pCex = Abc_CexAlloc( Saig_ManRegNum(pAig), Saig_ManPiNum(pAig), Vec_PtrSize(vStates) ); + pCex->iFrame = Vec_PtrSize(vStates)-1; + pCex->iPo = -1; + + // solve each time frame + iBit = Saig_ManRegNum(pAig); + pThis = Vec_PtrEntry( vStates, 0 ); + vAssumps = Vec_IntAlloc( 2 * Aig_ManRegNum(pAig) ); + Vec_PtrForEachEntryStart( unsigned *, vStates, pNext, i, 1 ) + { + // create assumptions + Vec_IntClear( vAssumps ); + Saig_ManForEachLo( pAig, pObj, k ) + Vec_IntPush( vAssumps, toLitCond( pCnf->pVarNums[Aig_ObjId(pObj)], !Aig_InfoHasBit(pThis,k) ) ); + Saig_ManForEachLi( pAig, pObj, k ) + Vec_IntPush( vAssumps, toLitCond( pCnf->pVarNums[Aig_ObjId(pObj)], !Aig_InfoHasBit(pNext,k) ) ); + // solve SAT problem + status = sat_solver_solve( pSat, Vec_IntArray(vAssumps), Vec_IntArray(vAssumps) + Vec_IntSize(vAssumps), + (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 ); + // if the problem is SAT, get the counterexample + if ( status != l_True ) + { + printf( "Llb4_Nonlin4TransformCex(): There is no transition between state %d and %d.\n", i-1, i ); + Vec_IntFree( vAssumps ); + sat_solver_delete( pSat ); + Cnf_DataFree( pCnf ); + ABC_FREE( pCex ); + return NULL; + } + // get the assignment of PIs + Saig_ManForEachPi( pAig, pObj, k ) + if ( sat_solver_var_value(pSat, pCnf->pVarNums[Aig_ObjId(pObj)]) ) + Aig_InfoSetBit( pCex->pData, iBit + k ); + // update the counter + iBit += Saig_ManPiNum(pAig); + pThis = pNext; + } + + // add the last frame when the property fails + Vec_IntClear( vAssumps ); + Saig_ManForEachPo( pAig, pObj, k ) + Vec_IntPush( vAssumps, toLitCond( pCnf->pVarNums[Aig_ObjId(pObj)], 0 ) ); + // add clause + status = sat_solver_addclause( pSat, Vec_IntArray(vAssumps), Vec_IntArray(vAssumps) + Vec_IntSize(vAssumps) ); + if ( status == 0 ) + { + printf( "Llb4_Nonlin4TransformCex(): The SAT solver is unsat after adding last clause.\n" ); + Vec_IntFree( vAssumps ); + sat_solver_delete( pSat ); + Cnf_DataFree( pCnf ); + ABC_FREE( pCex ); + return NULL; + } + // create assumptions + Vec_IntClear( vAssumps ); + Saig_ManForEachLo( pAig, pObj, k ) + Vec_IntPush( vAssumps, toLitCond( pCnf->pVarNums[Aig_ObjId(pObj)], !Aig_InfoHasBit(pThis,k) ) ); + // solve the last frame + status = sat_solver_solve( pSat, Vec_IntArray(vAssumps), Vec_IntArray(vAssumps) + Vec_IntSize(vAssumps), + (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 ); + if ( status != l_True ) + { + printf( "Llb4_Nonlin4TransformCex(): There is no last transition that makes the property fail.\n" ); + Vec_IntFree( vAssumps ); + sat_solver_delete( pSat ); + Cnf_DataFree( pCnf ); + ABC_FREE( pCex ); + return NULL; + } + // get the assignment of PIs + Saig_ManForEachPi( pAig, pObj, k ) + if ( sat_solver_var_value(pSat, pCnf->pVarNums[Aig_ObjId(pObj)]) ) + Aig_InfoSetBit( pCex->pData, iBit + k ); + iBit += Saig_ManPiNum(pAig); + assert( iBit == pCex->nBits ); + + // free the sat_solver + Vec_IntFree( vAssumps ); + sat_solver_delete( pSat ); + Cnf_DataFree( pCnf ); + + // verify counter-example + status = Saig_ManFindFailedPoCex( pAig, pCex ); + if ( status >= 0 && status < Saig_ManPoNum(pAig) ) + pCex->iPo = status; + else + { + printf( "Inter_ManGetCounterExample(): Counter-example verification has FAILED.\n" ); + ABC_FREE( pCex ); + return NULL; + } + // report the results +// if ( fVerbose ) +// Abc_PrintTime( 1, "SAT-based cex generation time", clock() - clk ); + return pCex; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + +ABC_NAMESPACE_IMPL_END + |