SAT solver with dynamic CNF loading.

src/sat/bmc/bmcLoad.c

+/**CFile****************************************************************
+
+  FileName    [bmcLoad.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [SAT-based bounded model checking.]
+
+  Synopsis    [Experiments with CNF loading.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: bmcLoad.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "bmc.h"
+#include "sat/bsat/satStore.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Bmc_Lad_t_ Bmc_Lad_t;  
+struct Bmc_Lad_t_
+{
+    Bmc_LadPar_t *   pPars;     // parameters
+    Gia_Man_t *      pGia;      // unrolled AIG
+    sat_solver *     pSat;      // SAT solvers
+    Vec_Int_t *      vSat2Id;   // maps SAT var into its node
+//    Vec_Int_t *      vCut;      // cut in terms of GIA IDs
+//    Vec_Int_t *      vCnf;      // CNF for the cut
+    int              nCallBacks1; 
+    int              nCallBacks2; 
+};
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+
+/**Function*************************************************************
+
+  Synopsis    [Load CNF for the cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Bmc_LadGetSatVar( Bmc_Lad_t * p, int Id )
+{
+    Gia_Obj_t * pObj = Gia_ManObj( p->pGia, Id );
+    if ( pObj->Value == 0 )
+    {
+        pObj->Value = Vec_IntSize( p->vSat2Id );
+        Vec_IntPush( p->vSat2Id, Id );
+        sat_solver_setnvars( p->pSat, Vec_IntSize(p->vSat2Id) );
+    }
+    return pObj->Value;
+}
+int Bmc_LadAddCnf( void * pMan, int iLit )
+{
+    Bmc_Lad_t * p = (Bmc_Lad_t *)pMan;
+    int Lits[3], iVar = Abc_Lit2Var(iLit);
+    Gia_Obj_t * pObj = Gia_ManObj( p->pGia, Vec_IntEntry(p->vSat2Id, iVar) );
+    p->nCallBacks1++;
+    if ( Gia_ObjIsCi(pObj) || Gia_ObjIsConst0(pObj) )
+        return 0;
+    assert( Gia_ObjIsAnd(pObj) );
+    if ( (Abc_LitIsCompl(iLit) ? pObj->fMark1 : pObj->fMark0) )
+        return 0;
+    Lits[0] = Abc_LitNot(iLit);
+    if ( Abc_LitIsCompl(iLit) )
+    {
+        Lits[1] = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId0p(p->pGia, pObj)), !Gia_ObjFaninC0(pObj) );
+        Lits[2] = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId1p(p->pGia, pObj)), !Gia_ObjFaninC1(pObj) );
+        sat_solver_clause_new( p->pSat, Lits, Lits + 3, 0 );
+        pObj->fMark1 = 1;
+    }
+    else
+    {
+        Lits[1] = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId0p(p->pGia, pObj)), Gia_ObjFaninC0(pObj) );
+        sat_solver_clause_new( p->pSat, Lits, Lits + 2, 0 );
+        Lits[1] = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId1p(p->pGia, pObj)), Gia_ObjFaninC1(pObj) );
+        sat_solver_clause_new( p->pSat, Lits, Lits + 2, 0 );
+        pObj->fMark0 = 1;
+    }
+    p->nCallBacks2++;
+    return 1;
+}
+int Bmc_LadAddCnf_rec( Bmc_Lad_t * p, int Id )
+{
+    int iVar = Bmc_LadGetSatVar( p, Id );
+    Gia_Obj_t * pObj = Gia_ManObj( p->pGia, Id );
+    if ( Gia_ObjIsAnd(pObj) && !(pObj->fMark0 && pObj->fMark1) )
+    {
+        Bmc_LadAddCnf( p, Abc_Var2Lit(iVar, 0) );
+        Bmc_LadAddCnf( p, Abc_Var2Lit(iVar, 1) );
+        Bmc_LadAddCnf_rec( p, Gia_ObjFaninId0(pObj, Id) );
+        Bmc_LadAddCnf_rec( p, Gia_ObjFaninId1(pObj, Id) );
+    }
+    return iVar;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Bmc_Lad_t * Bmc_LadStart( Gia_Man_t * pGia, Bmc_LadPar_t * pPars )
+{
+    Bmc_Lad_t * p;
+    int Lit;
+    Gia_ManSetPhase( pGia );
+    Gia_ManCleanValue( pGia );
+    Gia_ManCreateRefs( pGia );
+    p = ABC_CALLOC( Bmc_Lad_t, 1 );
+    p->pPars     = pPars;
+    p->pGia      = pGia;
+    p->pSat      = sat_solver_new();
+    p->vSat2Id   = Vec_IntAlloc( 1000 );
+    Vec_IntPush( p->vSat2Id, 0 );
+    // create constant node
+    Lit = Abc_Var2Lit( Bmc_LadGetSatVar(p, 0), 1 );
+    sat_solver_addclause( p->pSat, &Lit, &Lit + 1 );
+    // add callback for CNF loading
+    if ( pPars->fLoadCnf )
+        p->pSat->pCnfMan  = p;
+    if ( pPars->fLoadCnf )
+        p->pSat->pCnfFunc = Bmc_LadAddCnf;
+    return p;
+}
+void Bmc_LadStop( Bmc_Lad_t * p )
+{
+    Vec_IntFree( p->vSat2Id );
+    sat_solver_delete( p->pSat );
+    ABC_FREE( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bmc_PerformBmc( Gia_Man_t * pGia, Bmc_LadPar_t * pPars )
+{
+    int nConfLimit = 0;
+    Bmc_Lad_t * p;
+    Gia_Obj_t * pObj;
+    int i, status, Lit;
+    abctime clk = Abc_Clock();
+    p = Bmc_LadStart( pGia, pPars );
+    Gia_ManForEachPo( pGia, pObj, i )
+    {
+        if ( pPars->fLoadCnf )
+            Lit = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId0p(pGia, pObj)), Gia_ObjFaninC0(pObj) );
+        else
+            Lit = Abc_Var2Lit( Bmc_LadAddCnf_rec(p, Gia_ObjFaninId0p(pGia, pObj)), Gia_ObjFaninC0(pObj) );
+        if ( pPars->fVerbose )
+        {
+            printf( "Frame%4d :  ", i );
+            printf( "Vars = %6d  ", Vec_IntSize(p->vSat2Id) );
+            printf( "Clas = %6d  ", sat_solver_nclauses(p->pSat) );
+        }
+        status = sat_solver_solve( p->pSat, &Lit, &Lit + 1, (ABC_INT64_T)pPars->nConfLimit, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
+        if ( pPars->fVerbose )
+        {
+            printf( "Conf = %6d  ", sat_solver_nconflicts(p->pSat) );
+            if ( status == l_False )
+                printf( "UNSAT  " );
+            else if ( status == l_True )
+                printf( "SAT    " );
+            else // if ( status == l_Undec )
+                printf( "UNDEC  " );
+            Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
+        }
+    }
+    printf( "Callbacks = %d.  Loadings = %d.\n", p->nCallBacks1, p->nCallBacks2 );
+    Bmc_LadStop( p );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+