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/**CFile****************************************************************
FileName [saigAbsGla.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Sequential AIG package.]
Synopsis [Gate level abstraction.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: saigAbsGla.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "saig.h"
#include "satSolver.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
typedef struct Aig_GlaMan_t_ Aig_GlaMan_t;
struct Aig_GlaMan_t_
{
// user data
Aig_Man_t * pAig;
int nConfLimit;
int nFramesMax;
int fVerbose;
// abstraction
Vec_Int_t * vAbstr; // collects objects used in the abstraction
Vec_Int_t * vUsed; // maps object ID into its status (0=unused; 1=used)
Vec_Int_t * vPis; // primary inputs
Vec_Int_t * vPPis; // pseudo primary inputs
Vec_Int_t * vFlops; // flops
Vec_Int_t * vNodes; // nodes
// unrolling
int iFrame;
int nFrames;
Vec_Int_t * vObj2Vec; // maps obj ID into its vec ID
Vec_Int_t * vVec2Var; // maps vec ID into its sat Var (nFrames per vec ID)
Vec_Int_t * vVar2Inf; // maps sat Var into its frame and obj ID
// SAT solver
sat_solver * pSat;
};
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Performs abstraction of the AIG to preserve the included gates.]
Description [The array contains 1 if the obj is included; 0 otherwise.]
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Man_t * Aig_GlaDupAbsGates( Aig_Man_t * p, Vec_Int_t * vUsed, int * pnRealPis )
{
Aig_Man_t * pNew;
Aig_Obj_t * pObj, * pObjLi, * pObjLo;
int i, nFlops = 0, RetValue;
assert( Aig_ManPoNum(p) == 1 );
// start the new manager
pNew = Aig_ManStart( 5000 );
pNew->pName = Aig_UtilStrsav( p->pName );
// create constant
Aig_ManCleanData( p );
Aig_ManConst1(p)->pData = Aig_ManConst1(pNew);
// create PIs
Saig_ManForEachPi( p, pObj, i )
if ( Vec_IntEntry(vUsed, Aig_ObjId(pObj)) )
pObj->pData = Aig_ObjCreatePi(pNew);
if ( pnRealPis )
*pnRealPis = Aig_ManPiNum(pNew);
// create additional PIs
Saig_ManForEachLiLo( p, pObjLi, pObjLo, i )
if ( Vec_IntEntry(vUsed, Aig_ObjId(pObjLo)) && !Vec_IntEntry(vUsed, Aig_ObjId(pObjLi)) )
pObjLo->pData = Aig_ObjCreatePi(pNew);
Aig_ManForEachNode( p, pObj, i )
{
if ( Vec_IntEntry(vUsed, Aig_ObjId(pObj)) &&
(!Vec_IntEntry(vUsed, Aig_ObjFaninId0(pObj)) ||
!Vec_IntEntry(vUsed, Aig_ObjFaninId1(pObj))) )
pObj->pData = Aig_ObjCreatePi(pNew);
}
// create ROs
Saig_ManForEachLiLo( p, pObjLi, pObjLo, i )
if ( Vec_IntEntry(vUsed, Aig_ObjId(pObjLo)) && Vec_IntEntry(vUsed, Aig_ObjId(pObjLi)) )
pObjLo->pData = Aig_ObjCreatePi(pNew), nFlops++;
// create internal nodes
Aig_ManForEachNode( p, pObj, i )
{
if ( Vec_IntEntry(vUsed, Aig_ObjId(pObj)) &&
Vec_IntEntry(vUsed, Aig_ObjFaninId0(pObj)) &&
Vec_IntEntry(vUsed, Aig_ObjFaninId1(pObj)) )
pObj->pData = Aig_And( pNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
}
// create PO
Saig_ManForEachPo( p, pObj, i )
pObj->pData = Aig_ObjCreatePo( pNew, Aig_ObjChild0Copy(pObj) );
// create RIs
Saig_ManForEachLiLo( p, pObjLi, pObjLo, i )
if ( Vec_IntEntry(vUsed, Aig_ObjId(pObjLo)) && Vec_IntEntry(vUsed, Aig_ObjId(pObjLi)) )
pObjLi->pData = Aig_ObjCreatePo( pNew, Aig_ObjChild0Copy(pObjLi) );
Aig_ManSetRegNum( pNew, nFlops );
// clean up
RetValue = Aig_ManCleanup( pNew );
assert( RetValue == 0 );
return pNew;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Man_t * Aig_GlaDeriveAbs( Aig_GlaMan_t * p )
{
Aig_Man_t * pNew;
Aig_Obj_t * pObj;
int i, nFlops = 0, RetValue;
assert( Aig_ManPoNum(p) == 1 );
// start the new manager
pNew = Aig_ManStart( 5000 );
pNew->pName = Aig_UtilStrsav( p->pAig->pName );
// create constant
Aig_ManCleanData( p->pAig );
Aig_ManConst1(p->pAig)->pData = Aig_ManConst1(pNew);
// create PIs
Aig_ManForEachObjVec( p->vPis, p->pAig, pObj, i )
pObj->pData = Aig_ObjCreatePi(pNew);
// create additional PIs
Aig_ManForEachObjVec( p->vPPis, p->pAig, pObj, i )
pObj->pData = Aig_ObjCreatePi(pNew);
// create ROs
Aig_ManForEachObjVec( p->vFlops, p->pAig, pObj, i )
pObj->pData = Aig_ObjCreatePi(pNew);
// create internal nodes
Aig_ManForEachObjVec( p->vNodes, p->pAig, pObj, i )
pObj->pData = Aig_And( pNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
// create PO
Saig_ManForEachPo( p->pAig, pObj, i )
pObj->pData = Aig_ObjCreatePo( pNew, Aig_ObjChild0Copy(pObj) );
// create RIs
Aig_ManForEachObjVec( p->vFlops, p->pAig, pObj, i )
Saig_ObjLoToLi(p->pAig, pObj)->pData = Aig_ObjCreatePo( pNew, Aig_ObjChild0Copy(Saig_ObjLoToLi(p->pAig, pObj)) );
Aig_ManSetRegNum( pNew, Vec_IntSize(p->vFlops) );
// clean up
RetValue = Aig_ManCleanup( pNew );
assert( RetValue == 0 );
return pNew;
}
/**Function*************************************************************
Synopsis [Adds constant to the solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_GlaAddConst( sat_solver * pSat, int iVar, int fCompl )
{
lit Lit = toLitCond( iVar, fCompl );
if ( !sat_solver_addclause( pSat, &Lit, &Lit + 1 ) )
return 0;
return 1;
}
/**Function*************************************************************
Synopsis [Adds buffer to the solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_GlaAddBuffer( sat_solver * pSat, int iVar0, int iVar1, int fCompl )
{
lit Lits[2];
Lits[0] = toLitCond( iVar0, 0 );
Lits[1] = toLitCond( iVar1, !fCompl );
if ( !sat_solver_addclause( pSat, Lits, Lits + 2 ) )
return 0;
Lits[0] = toLitCond( iVar0, 1 );
Lits[1] = toLitCond( iVar1, fCompl );
if ( !sat_solver_addclause( pSat, Lits, Lits + 2 ) )
return 0;
return 1;
}
/**Function*************************************************************
Synopsis [Adds buffer to the solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_GlaAddNode( sat_solver * pSat, int iVar, int iVar0, int iVar1, int fCompl0, int fCompl1 )
{
lit Lits[3];
Lits[0] = toLitCond( iVar, 1 );
Lits[1] = toLitCond( iVar0, fCompl0 );
if ( !sat_solver_addclause( pSat, Lits, Lits + 2 ) )
return 0;
Lits[0] = toLitCond( iVar, 1 );
Lits[1] = toLitCond( iVar1, fCompl1 );
if ( !sat_solver_addclause( pSat, Lits, Lits + 2 ) )
return 0;
Lits[0] = toLitCond( iVar, 0 );
Lits[1] = toLitCond( iVar0, !fCompl0 );
Lits[2] = toLitCond( iVar1, !fCompl1 );
if ( !sat_solver_addclause( pSat, Lits, Lits + 3 ) )
return 0;
return 1;
}
/**Function*************************************************************
Synopsis [Finds existing SAT variable or creates a new one.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_GlaFetchVar( Aig_GlaMan_t * p, Aig_Obj_t * pObj, int k )
{
int i, iVecId, iSatVar;
if ( !Vec_IntEntry(p->vUsed, Aig_ObjId(pObj)) )
{
Vec_IntWriteEntry( p->vUsed, Aig_ObjId(pObj), 1 );
Vec_IntPush( p->vAbstr, Aig_ObjId(pObj) );
}
iVecId = Vec_IntEntry( p->vObj2Vec, Aig_ObjId(pObj) );
if ( iVecId == 0 )
{
iVecId = Vec_IntSize( p->vVec2Var ) / p->nFrames;
for ( i = 0; i < p->nFrames; i++ )
Vec_IntPush( p->vVec2Var, 0 );
}
iSatVar = Vec_IntEntry( p->vVec2Var, iVecId * p->nFrames + k );
if ( iSatVar == 0 )
{
iSatVar = Vec_IntSize( p->vVar2Inf ) / 2;
Vec_IntPush( p->vVar2Inf, Aig_ObjId(pObj) );
Vec_IntPush( p->vVar2Inf, k );
Vec_IntWriteEntry( p->vVec2Var, iVecId * p->nFrames + k, iSatVar );
}
return iSatVar;
}
/**Function*************************************************************
Synopsis [Adds CNF for the given object in the given frame.]
Description [Returns 0, if the solver becames UNSAT.]
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_GlaObjAddToSolver( Aig_GlaMan_t * p, Aig_Obj_t * pObj, int k )
{
assert( Vec_IntEntry(vUsed, Aig_ObjId(pObj)) );
if ( Aig_ObjIsConst1(pObj) )
return Aig_GlaAddConst( p->pSat, Aig_GlaFetchVar(p, pObj, k), 0 );
if ( Saig_ObjIsPi(p->pAig, pObj) )
return 1;
if ( Saig_ObjIsLo(p->pAig, pObj) )
{
Aig_Obj_t * pObjLi = Saig_ObjLoToLi(p->pAig, pObj);
if ( k == 0 )
return Aig_GlaAddConst( p->pSat, Aig_GlaFetchVar(p, pObj, k), 1 );
if ( Vec_IntEntry(p->vUsed, Aig_ObjId(pObjLi)) )
return 1;
return Aig_GlaAddBuffer( p->pSat, Aig_GlaFetchVar(p, pObj, k), Aig_GlaFetchVar(p, Aig_ObjFanin0(pObjLi), k-1), Aig_ObjFaninC0(pObjLi) );
}
assert( Aig_ObjIsNode(pObj) );
if ( Vec_IntEntry(p->vUsed, Aig_ObjFaninId0(pObj)) && Vec_IntEntry(p->vUsed, Aig_ObjFaninId1(pObj)) )
return 0;
return Aig_GlaAddNode( p->pSat, Aig_GlaFetchVar(p, pObj, k),
Aig_GlaFetchVar(p, Aig_ObjFanin0(pObj), k),
Aig_GlaFetchVar(p, Aig_ObjFanin1(pObj), k),
Aig_ObjFaninC0(pObj), Aig_ObjFaninC1(pObj) );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_GlaMan_t * Aig_GlaManStart( Aig_Man_t * pAig )
{
Aig_GlaMan_t * p;
int i;
p = ABC_CALLOC( Aig_GlaMan_t, 1 );
p->pAig = pAig;
p->vAbstr = Vec_IntAlloc( 1000 );
p->vUsed = Vec_IntStart( Aig_ManObjNumMax(pAig) );
p->nFrames = 16;
p->vPis = Vec_IntAlloc( 1000 );
p->vPPis = Vec_IntAlloc( 1000 );
p->vFlops = Vec_IntAlloc( 1000 );
p->vNodes = Vec_IntAlloc( 1000 );
p->vObj2Vec = Vec_IntStart( Aig_ManObjNumMax(pAig) );
p->vVec2Var = Vec_IntAlloc( 1 << 20 );
p->vVar2Inf = Vec_IntAlloc( 1 << 20 );
// skip first vector ID
for ( i = 0; i < p->nFrames; i++ )
Vec_IntPush( p->vVec2Var, -1 );
// skip first SAT variable
Vec_IntPush( p->vVar2Inf, -1 );
Vec_IntPush( p->vVar2Inf, -1 );
// start the SAT solver
p->pSat = sat_solver_new();
sat_solver_setnvars( p->pSat, 1000 );
return p;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_GlaManStop( Aig_GlaMan_t * p )
{
Vec_IntFreeP( &p->vAbstr );
Vec_IntFreeP( &p->vUsed );
Vec_IntFreeP( &p->vPis );
Vec_IntFreeP( &p->vPPis );
Vec_IntFreeP( &p->vFlops );
Vec_IntFreeP( &p->vNodes );
Vec_IntFreeP( &p->vObj2Vec );
Vec_IntFreeP( &p->vVec2Var );
Vec_IntFreeP( &p->vVar2Inf );
if ( p->pSat )
sat_solver_delete( p->pSat );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_GlaCollectAbstr( Aig_GlaMan_t * p )
{
Aig_Obj_t * pObj, * pObjLi, * pObjLo;
int i;
Vec_IntClear( p->vPis );
Vec_IntClear( p->vPPis );
Vec_IntClear( p->vFlops );
Vec_IntClear( p->vNodes );
Saig_ManForEachPi( p->pAig, pObj, i )
if ( Vec_IntEntry(p->vUsed, Aig_ObjId(pObj)) )
Vec_IntPush( p->vPis, Aig_ObjId(pObj) );
Saig_ManForEachLiLo( p->pAig, pObjLi, pObjLo, i )
if ( Vec_IntEntry(p->vUsed, Aig_ObjId(pObjLo)) )
{
if ( Vec_IntEntry(p->vUsed, Aig_ObjFaninId0(pObjLi)) )
Vec_IntPush( p->vFlops, Aig_ObjId(pObjLo) );
else
Vec_IntPush( p->vPPis, Aig_ObjId(pObjLo) );
}
Aig_ManForEachNode( p->pAig, pObj, i )
if ( Vec_IntEntry(p->vUsed, Aig_ObjId(pObj)) )
{
if ( Vec_IntEntry(p->vUsed, Aig_ObjFaninId0(pObj)) && Vec_IntEntry(p->vUsed, Aig_ObjFaninId1(pObj)) )
Vec_IntPush( p->vNodes, Aig_ObjId(pObjLo) );
else
Vec_IntPush( p->vPPis, Aig_ObjId(pObjLo) );
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Cex_t * Aig_GlaDeriveCex( Aig_GlaMan_t * p )
{
return NULL;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_GlaPrintAbstr( Aig_GlaMan_t * p, int f, int r )
{
printf( "Fra %3d : Ref %3d : PI =%6d PPI =%6d Flop =%6d Node =%6d\n",
f, r, Vec_IntSize(p->vPis), Vec_IntSize(p->vPPis), Vec_IntSize(p->vFlops), Vec_IntSize(p->vNodes) );
}
/**Function*************************************************************
Synopsis [Perform variable frame abstraction.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_GlaManTest( Aig_Man_t * pAig, int nFramesMax, int nConfLimit, int fVerbose )
{
Aig_GlaMan_t * p;
Aig_Man_t * pAbs;
Aig_Obj_t * pObj;
Abc_Cex_t * pCex;
Vec_Int_t * vPPisToRefine;
int f, g, r, i, iSatVar, Lit, Entry, RetValue;
assert( Saig_ManPoNum(pAig) == 1 );
// start the solver
p = Aig_GlaManStart( pAig );
p->nFramesMax = nFramesMax;
p->nConfLimit = nConfLimit;
p->fVerbose = fVerbose;
// iterate over the timeframes
for ( f = 0; f < nFramesMax; f++ )
{
// initialize abstraction in this timeframe
Aig_ManForEachObjVec( p->vAbstr, pAig, pObj, i )
Aig_GlaObjAddToSolver( p, pObj, f );
// create output literal to represent property failure
pObj = Aig_ManPo( pAig, 0 );
iSatVar = Aig_GlaFetchVar( p, Aig_ObjFanin0(pObj), f );
Lit = toLitCond( iSatVar, Aig_ObjFaninC0(pObj) );
// try solving the abstraction
Aig_GlaPrintAbstr( p, f, -1 );
for ( r = 0; r < 1000000; r++ )
{
RetValue = sat_solver_solve( p->pSat, &Lit, &Lit + 1,
(ABC_INT64_T)nConfLimit, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
if ( RetValue != l_True )
break;
// derive abstraction
Aig_GlaCollectAbstr( p );
// derive counter-example
pCex = Aig_GlaDeriveCex( p );
// derive abstraction
pAbs = Aig_GlaDeriveAbs( p );
// perform refinement
vPPisToRefine = Saig_ManCbaFilterInputs( pAig, Vec_IntSize(p->vPis), pCex, 0 );
// update
Vec_IntForEachEntry( vPPisToRefine, Entry, i )
{
for ( g = 0; g <= f; g++ )
Aig_GlaObjAddToSolver( p, Aig_ManObj(pAig, Vec_IntEntry(p->vPPis, Entry)), g );
}
Vec_IntFree( vPPisToRefine );
// print abstraction
Aig_GlaPrintAbstr( p, f, r );
}
if ( RetValue != l_False )
break;
}
Aig_GlaPrintAbstr( p, f, -1 );
if ( f == nFramesMax )
printf( "Finished %d frames without exceeding conflict limit (%d).\n", f, nConfLimit );
else
printf( "Ran out of conflict limit (%d) at frame %d.\n", nConfLimit, f );
Aig_GlaManStop( p );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
