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/**CFile****************************************************************
FileName [cnfUtil.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [AIG-to-CNF conversion.]
Synopsis []
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: cnfUtil.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "cnf.h"
#include "sat/bsat/satSolver.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ManScanMapping_rec( Cnf_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vMapped )
{
Aig_Obj_t * pLeaf;
Dar_Cut_t * pCutBest;
int aArea, i;
if ( pObj->nRefs++ || Aig_ObjIsCi(pObj) || Aig_ObjIsConst1(pObj) )
return 0;
assert( Aig_ObjIsAnd(pObj) );
// collect the node first to derive pre-order
if ( vMapped )
Vec_PtrPush( vMapped, pObj );
// visit the transitive fanin of the selected cut
if ( pObj->fMarkB )
{
Vec_Ptr_t * vSuper = Vec_PtrAlloc( 100 );
Aig_ObjCollectSuper( pObj, vSuper );
aArea = Vec_PtrSize(vSuper) + 1;
Vec_PtrForEachEntry( Aig_Obj_t *, vSuper, pLeaf, i )
aArea += Aig_ManScanMapping_rec( p, Aig_Regular(pLeaf), vMapped );
Vec_PtrFree( vSuper );
////////////////////////////
pObj->fMarkB = 1;
}
else
{
pCutBest = Dar_ObjBestCut( pObj );
aArea = Cnf_CutSopCost( p, pCutBest );
Dar_CutForEachLeaf( p->pManAig, pCutBest, pLeaf, i )
aArea += Aig_ManScanMapping_rec( p, pLeaf, vMapped );
}
return aArea;
}
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
Description [Collects the nodes in reverse topological order.]
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManScanMapping( Cnf_Man_t * p, int fCollect )
{
Vec_Ptr_t * vMapped = NULL;
Aig_Obj_t * pObj;
int i;
// clean all references
Aig_ManForEachObj( p->pManAig, pObj, i )
pObj->nRefs = 0;
// allocate the array
if ( fCollect )
vMapped = Vec_PtrAlloc( 1000 );
// collect nodes reachable from POs in the DFS order through the best cuts
p->aArea = 0;
Aig_ManForEachCo( p->pManAig, pObj, i )
p->aArea += Aig_ManScanMapping_rec( p, Aig_ObjFanin0(pObj), vMapped );
// printf( "Variables = %6d. Clauses = %8d.\n", vMapped? Vec_PtrSize(vMapped) + Aig_ManCiNum(p->pManAig) + 1 : 0, p->aArea + 2 );
return vMapped;
}
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Cnf_ManScanMapping_rec( Cnf_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vMapped, int fPreorder )
{
Aig_Obj_t * pLeaf;
Cnf_Cut_t * pCutBest;
int aArea, i;
if ( pObj->nRefs++ || Aig_ObjIsCi(pObj) || Aig_ObjIsConst1(pObj) )
return 0;
assert( Aig_ObjIsAnd(pObj) );
assert( pObj->pData != NULL );
// add the node to the mapping
if ( vMapped && fPreorder )
Vec_PtrPush( vMapped, pObj );
// visit the transitive fanin of the selected cut
if ( pObj->fMarkB )
{
Vec_Ptr_t * vSuper = Vec_PtrAlloc( 100 );
Aig_ObjCollectSuper( pObj, vSuper );
aArea = Vec_PtrSize(vSuper) + 1;
Vec_PtrForEachEntry( Aig_Obj_t *, vSuper, pLeaf, i )
aArea += Cnf_ManScanMapping_rec( p, Aig_Regular(pLeaf), vMapped, fPreorder );
Vec_PtrFree( vSuper );
////////////////////////////
pObj->fMarkB = 1;
}
else
{
pCutBest = (Cnf_Cut_t *)pObj->pData;
// assert( pCutBest->nFanins > 0 );
assert( pCutBest->Cost < 127 );
aArea = pCutBest->Cost;
Cnf_CutForEachLeaf( p->pManAig, pCutBest, pLeaf, i )
aArea += Cnf_ManScanMapping_rec( p, pLeaf, vMapped, fPreorder );
}
// add the node to the mapping
if ( vMapped && !fPreorder )
Vec_PtrPush( vMapped, pObj );
return aArea;
}
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
Description [Collects the nodes in reverse topological order.]
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Cnf_ManScanMapping( Cnf_Man_t * p, int fCollect, int fPreorder )
{
Vec_Ptr_t * vMapped = NULL;
Aig_Obj_t * pObj;
int i;
// clean all references
Aig_ManForEachObj( p->pManAig, pObj, i )
pObj->nRefs = 0;
// allocate the array
if ( fCollect )
vMapped = Vec_PtrAlloc( 1000 );
// collect nodes reachable from POs in the DFS order through the best cuts
p->aArea = 0;
Aig_ManForEachCo( p->pManAig, pObj, i )
p->aArea += Cnf_ManScanMapping_rec( p, Aig_ObjFanin0(pObj), vMapped, fPreorder );
// printf( "Variables = %6d. Clauses = %8d.\n", vMapped? Vec_PtrSize(vMapped) + Aig_ManCiNum(p->pManAig) + 1 : 0, p->aArea + 2 );
return vMapped;
}
/**Function*************************************************************
Synopsis [Returns the array of CI IDs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Cnf_DataCollectCiSatNums( Cnf_Dat_t * pCnf, Aig_Man_t * p )
{
Vec_Int_t * vCiIds;
Aig_Obj_t * pObj;
int i;
vCiIds = Vec_IntAlloc( Aig_ManCiNum(p) );
Aig_ManForEachCi( p, pObj, i )
Vec_IntPush( vCiIds, pCnf->pVarNums[pObj->Id] );
return vCiIds;
}
/**Function*************************************************************
Synopsis [Returns the array of CI IDs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Cnf_DataCollectCoSatNums( Cnf_Dat_t * pCnf, Aig_Man_t * p )
{
Vec_Int_t * vCoIds;
Aig_Obj_t * pObj;
int i;
vCoIds = Vec_IntAlloc( Aig_ManCoNum(p) );
Aig_ManForEachCo( p, pObj, i )
Vec_IntPush( vCoIds, pCnf->pVarNums[pObj->Id] );
return vCoIds;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
unsigned char * Cnf_DataDeriveLitPolarities( Cnf_Dat_t * p )
{
int i, c, iClaBeg, iClaEnd, * pLit;
unsigned * pPols0 = ABC_CALLOC( unsigned, Aig_ManObjNumMax(p->pMan) );
unsigned * pPols1 = ABC_CALLOC( unsigned, Aig_ManObjNumMax(p->pMan) );
unsigned char * pPres = ABC_CALLOC( unsigned char, p->nClauses );
for ( i = 0; i < Aig_ManObjNumMax(p->pMan); i++ )
{
if ( p->pObj2Count[i] == 0 )
continue;
iClaBeg = p->pObj2Clause[i];
iClaEnd = p->pObj2Clause[i] + p->pObj2Count[i];
// go through the negative polarity clauses
for ( c = iClaBeg; c < iClaEnd; c++ )
for ( pLit = p->pClauses[c]+1; pLit < p->pClauses[c+1]; pLit++ )
if ( Abc_LitIsCompl(p->pClauses[c][0]) )
pPols0[Abc_Lit2Var(*pLit)] |= (unsigned)(2 - Abc_LitIsCompl(*pLit)); // taking the opposite (!) -- not the case
else
pPols1[Abc_Lit2Var(*pLit)] |= (unsigned)(2 - Abc_LitIsCompl(*pLit)); // taking the opposite (!) -- not the case
// record these clauses
for ( c = iClaBeg; c < iClaEnd; c++ )
for ( pLit = p->pClauses[c]+1; pLit < p->pClauses[c+1]; pLit++ )
if ( Abc_LitIsCompl(p->pClauses[c][0]) )
pPres[c] = (unsigned char)( (unsigned)pPres[c] | (pPols0[Abc_Lit2Var(*pLit)] << (2*(pLit-p->pClauses[c]-1))) );
else
pPres[c] = (unsigned char)( (unsigned)pPres[c] | (pPols1[Abc_Lit2Var(*pLit)] << (2*(pLit-p->pClauses[c]-1))) );
// clean negative polarity
for ( c = iClaBeg; c < iClaEnd; c++ )
for ( pLit = p->pClauses[c]+1; pLit < p->pClauses[c+1]; pLit++ )
pPols0[Abc_Lit2Var(*pLit)] = pPols1[Abc_Lit2Var(*pLit)] = 0;
}
ABC_FREE( pPols0 );
ABC_FREE( pPols1 );
/*
// for ( c = 0; c < p->nClauses; c++ )
for ( c = 0; c < 100; c++ )
{
printf( "Clause %6d : ", c );
for ( i = 0; i < 4; i++ )
printf( "%d ", ((unsigned)pPres[c] >> (2*i)) & 3 );
printf( " " );
for ( pLit = p->pClauses[c]; pLit < p->pClauses[c+1]; pLit++ )
printf( "%6d ", *pLit );
printf( "\n" );
}
*/
return pPres;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cnf_Dat_t * Cnf_DataReadFromFile( char * pFileName )
{
int MaxLine = 1000000;
int Var, Lit, nVars = -1, nClas = -1, i, Entry, iLine = 0;
Cnf_Dat_t * pCnf = NULL;
Vec_Int_t * vClas = NULL;
Vec_Int_t * vLits = NULL;
char * pBuffer, * pToken;
FILE * pFile = fopen( pFileName, "rb" );
if ( pFile == NULL )
{
printf( "Cannot open file \"%s\" for writing.\n", pFileName );
return NULL;
}
pBuffer = ABC_ALLOC( char, MaxLine );
while ( fgets(pBuffer, MaxLine, pFile) != NULL )
{
iLine++;
if ( pBuffer[0] == 'c' )
continue;
if ( pBuffer[0] == 'p' )
{
pToken = strtok( pBuffer+1, " \t" );
if ( strcmp(pToken, "cnf") )
{
printf( "Incorrect input file.\n" );
goto finish;
}
pToken = strtok( NULL, " \t" );
nVars = atoi( pToken );
pToken = strtok( NULL, " \t" );
nClas = atoi( pToken );
if ( nVars <= 0 || nClas <= 0 )
{
printf( "Incorrect parameters.\n" );
goto finish;
}
// temp storage
vClas = Vec_IntAlloc( nClas+1 );
vLits = Vec_IntAlloc( nClas*8 );
continue;
}
pToken = strtok( pBuffer, " \t\r\n" );
if ( pToken == NULL )
continue;
Vec_IntPush( vClas, Vec_IntSize(vLits) );
while ( pToken )
{
Var = atoi( pToken );
if ( Var == 0 )
break;
Lit = (Var > 0) ? Abc_Var2Lit(Var-1, 0) : Abc_Var2Lit(-Var-1, 1);
if ( Lit >= 2*nVars )
{
printf( "Literal %d is out-of-bound for %d variables.\n", Lit, nVars );
goto finish;
}
Vec_IntPush( vLits, Lit );
pToken = strtok( NULL, " \t\r\n" );
}
if ( Var != 0 )
{
printf( "There is no zero-terminator in line %d.\n", iLine );
goto finish;
}
}
// finalize
if ( Vec_IntSize(vClas) != nClas )
printf( "Warning! The number of clauses (%d) is different from declaration (%d).\n", Vec_IntSize(vClas), nClas );
Vec_IntPush( vClas, Vec_IntSize(vLits) );
// create
pCnf = ABC_CALLOC( Cnf_Dat_t, 1 );
pCnf->nVars = nVars;
pCnf->nClauses = nClas;
pCnf->nLiterals = Vec_IntSize(vLits);
pCnf->pClauses = ABC_ALLOC( int *, Vec_IntSize(vClas) );
pCnf->pClauses[0] = Vec_IntReleaseArray(vLits);
Vec_IntForEachEntry( vClas, Entry, i )
pCnf->pClauses[i] = pCnf->pClauses[0] + Entry;
finish:
fclose( pFile );
Vec_IntFreeP( &vClas );
Vec_IntFreeP( &vLits );
ABC_FREE( pBuffer );
return pCnf;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Cnf_DataSolveFromFile( char * pFileName, int nConfLimit, int nLearnedStart, int nLearnedDelta, int nLearnedPerce, int fVerbose, int ** ppModel, int nPis )
{
abctime clk = Abc_Clock();
Cnf_Dat_t * pCnf = Cnf_DataReadFromFile( pFileName );
sat_solver * pSat;
int i, status, RetValue = -1;
if ( pCnf == NULL )
return -1;
if ( fVerbose )
{
printf( "CNF stats: Vars = %6d. Clauses = %7d. Literals = %8d. ", pCnf->nVars, pCnf->nClauses, pCnf->nLiterals );
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
}
// convert into SAT solver
pSat = (sat_solver *)Cnf_DataWriteIntoSolver( pCnf, 1, 0 );
if ( pSat == NULL )
{
printf( "The problem is trivially UNSAT.\n" );
Cnf_DataFree( pCnf );
return 1;
}
if ( nLearnedStart )
pSat->nLearntStart = pSat->nLearntMax = nLearnedStart;
if ( nLearnedDelta )
pSat->nLearntDelta = nLearnedDelta;
if ( nLearnedPerce )
pSat->nLearntRatio = nLearnedPerce;
if ( fVerbose )
pSat->fVerbose = fVerbose;
// solve the miter
status = sat_solver_solve( pSat, NULL, NULL, (ABC_INT64_T)nConfLimit, 0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
if ( status == l_Undef )
RetValue = -1;
else if ( status == l_True )
RetValue = 0;
else if ( status == l_False )
RetValue = 1;
else
assert( 0 );
if ( fVerbose )
Sat_SolverPrintStats( stdout, pSat );
if ( RetValue == -1 )
Abc_Print( 1, "UNDECIDED " );
else if ( RetValue == 0 )
Abc_Print( 1, "SATISFIABLE " );
else
Abc_Print( 1, "UNSATISFIABLE " );
//Abc_Print( -1, "\n" );
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
// derive SAT assignment
if ( RetValue == 0 )
{
*ppModel = ABC_ALLOC( int, nPis );
for ( i = 0; i < nPis; i++ )
(*ppModel)[i] = sat_solver_var_value( pSat, pCnf->nVars - nPis + i );
}
Cnf_DataFree( pCnf );
sat_solver_delete( pSat );
return RetValue;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
