summaryrefslogtreecommitdiffstats
path: root/src/proof/pdr/pdrCnf.c
blob: 3b28c3c8b2092bab6df616fdc67ddb88192d7eb2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
/**CFile****************************************************************

  FileName    [pdrCnf.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Property driven reachability.]

  Synopsis    [CNF computation on demand.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

  Date        [Ver. 1.0. Started - November 20, 2010.]

  Revision    [$Id: pdrCnf.c,v 1.00 2010/11/20 00:00:00 alanmi Exp $]

***********************************************************************/

#include "pdrInt.h"

ABC_NAMESPACE_IMPL_START


////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////

/*
    The CNF (p->pCnf2) is expressed in terms of object IDs.
    Each node in the CNF is marked if it has clauses (p->pCnf2->pObj2Count[Id] > 0).
    Each node in the CNF has the first clause (p->pCnf2->pObj2Clause) 
    and the number of clauses (p->pCnf2->pObj2Count).
    Each node used in a CNF of any timeframe has its SAT var recorded.
    Each frame has a reserve mapping of SAT variables into ObjIds.
*/

////////////////////////////////////////////////////////////////////////
///                     FUNCTION DEFINITIONS                         ///
////////////////////////////////////////////////////////////////////////

/**Function*************************************************************

  Synopsis    [Returns SAT variable of the given object.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int Pdr_ObjSatVar1( Pdr_Man_t * p, int k, Aig_Obj_t * pObj )
{
    return p->pCnf1->pVarNums[ Aig_ObjId(pObj) ];
}

/**Function*************************************************************

  Synopsis    [Returns SAT variable of the given object.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
//#define USE_PG
#ifdef USE_PG
static inline int Pdr_ObjSatVar2FindOrAdd( Pdr_Man_t * p, int k, Aig_Obj_t * pObj )
{ 
    Vec_Int_t * vId2Vars = p->pvId2Vars + Aig_ObjId(pObj);
    assert( p->pCnf2->pObj2Count[Aig_ObjId(pObj)] >= 0 );
    if ( Vec_IntSize(vId2Vars) == 0 )
        Vec_IntGrow(vId2Vars, 2 * k + 1);
    if ( Vec_IntGetEntry(vId2Vars, k) == 0 )
    {
        sat_solver * pSat = Pdr_ManSolver(p, k);
        Vec_Int_t * vVar2Ids = (Vec_Int_t *)Vec_PtrEntry(&p->vVar2Ids, k);
        int iVarNew = Vec_IntSize( vVar2Ids );
        assert( iVarNew > 0 );
        Vec_IntPush( vVar2Ids, Aig_ObjId(pObj) );
        Vec_IntWriteEntry( vId2Vars, k, iVarNew << 2 );
        sat_solver_setnvars( pSat, iVarNew + 1 );
        if ( k == 0 && Saig_ObjIsLo(p->pAig, pObj) ) // initialize the register output
        {
            int Lit = Abc_Var2Lit( iVarNew, 1 );
            int RetValue = sat_solver_addclause( pSat, &Lit, &Lit + 1 );
            assert( RetValue == 1 );
            (void) RetValue;
            sat_solver_compress( pSat );
        }
    }
    return Vec_IntEntry( vId2Vars, k );
}
int Pdr_ObjSatVar2( Pdr_Man_t * p, int k, Aig_Obj_t * pObj, int Level, int Pol )
{
    Vec_Int_t * vLits;
    sat_solver * pSat;
    Vec_Int_t * vVar2Ids = (Vec_Int_t *)Vec_PtrEntry(&p->vVar2Ids, k);
    int nVarCount = Vec_IntSize(vVar2Ids);
    int iVarThis  = Pdr_ObjSatVar2FindOrAdd( p, k, pObj );
    int * pLit, i, iVar, iClaBeg, iClaEnd, RetValue;
    int PolPres = (iVarThis & 3);
    iVarThis >>= 2;
    if ( Aig_ObjIsCi(pObj) )
        return iVarThis;
//    Pol = 3;
//    if ( nVarCount != Vec_IntSize(vVar2Ids) || (Pol & ~PolPres) )
    if ( (Pol & ~PolPres) )
    {
        *Vec_IntEntryP( p->pvId2Vars + Aig_ObjId(pObj), k ) |= Pol;
        iClaBeg = p->pCnf2->pObj2Clause[Aig_ObjId(pObj)];
        iClaEnd = iClaBeg + p->pCnf2->pObj2Count[Aig_ObjId(pObj)];
        assert( iClaBeg < iClaEnd );
/*
        if ( (Pol & ~PolPres) != 3 )
        for ( i = iFirstClause; i < iFirstClause + nClauses; i++ )
        {
            printf( "Clause %5d : ", i );
            for ( iVar = 0; iVar < 4; iVar++ )
                printf( "%d ", ((unsigned)p->pCnf2->pClaPols[i] >> (2*iVar)) & 3 );
            printf( "  " );
            for ( pLit = p->pCnf2->pClauses[i]; pLit < p->pCnf2->pClauses[i+1]; pLit++ )
                printf( "%6d ", *pLit );
            printf( "\n" );
        }
*/
        pSat = Pdr_ManSolver(p, k);
        vLits = Vec_WecEntry( p->vVLits, Level );
        if ( (Pol & ~PolPres) == 3 )
        {
            assert( nVarCount + 1 == Vec_IntSize(vVar2Ids) );
            for ( i = iClaBeg; i < iClaEnd; i++ )
            {
                Vec_IntClear( vLits );
                Vec_IntPush( vLits, Abc_Var2Lit( iVarThis, Abc_LitIsCompl(p->pCnf2->pClauses[i][0]) ) );
                for ( pLit = p->pCnf2->pClauses[i]+1; pLit < p->pCnf2->pClauses[i+1]; pLit++ )
                {
                    iVar = Pdr_ObjSatVar2( p, k, Aig_ManObj(p->pAig, Abc_Lit2Var(*pLit)), Level+1, 3 );
                    Vec_IntPush( vLits, Abc_Var2Lit( iVar, Abc_LitIsCompl(*pLit) ) );
                }
                RetValue = sat_solver_addclause( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits)+Vec_IntSize(vLits) );
                assert( RetValue );
                (void) RetValue;
            }
        }
        else // if ( (Pol & ~PolPres) == 2 || (Pol & ~PolPres) == 1 ) // write pos/neg polarity
        {
            assert( (Pol & ~PolPres) );
            for ( i = iClaBeg; i < iClaEnd; i++ )
            if ( 2 - !Abc_LitIsCompl(p->pCnf2->pClauses[i][0]) == (Pol & ~PolPres) ) // taking opposite literal
            {
                Vec_IntClear( vLits );
                Vec_IntPush( vLits, Abc_Var2Lit( iVarThis, Abc_LitIsCompl(p->pCnf2->pClauses[i][0]) ) );
                for ( pLit = p->pCnf2->pClauses[i]+1; pLit < p->pCnf2->pClauses[i+1]; pLit++ )
                {
                    iVar = Pdr_ObjSatVar2( p, k, Aig_ManObj(p->pAig, Abc_Lit2Var(*pLit)), Level+1, ((unsigned)p->pCnf2->pClaPols[i] >> (2*(pLit-p->pCnf2->pClauses[i]-1))) & 3 );
                    Vec_IntPush( vLits, Abc_Var2Lit( iVar, Abc_LitIsCompl(*pLit) ) );
                }
                RetValue = sat_solver_addclause( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits)+Vec_IntSize(vLits) );
                assert( RetValue );
                (void) RetValue;
            }
        }
    }
    return iVarThis;
}

#else
static inline int Pdr_ObjSatVar2FindOrAdd( Pdr_Man_t * p, int k, Aig_Obj_t * pObj, int * pfNewVar )
{ 
    Vec_Int_t * vId2Vars = p->pvId2Vars + Aig_ObjId(pObj);
    assert( p->pCnf2->pObj2Count[Aig_ObjId(pObj)] >= 0 );
    if ( Vec_IntSize(vId2Vars) == 0 )
        Vec_IntGrow(vId2Vars, 2 * k + 1);
    if ( Vec_IntGetEntry(vId2Vars, k) == 0 )
    {
        sat_solver * pSat = Pdr_ManSolver(p, k);
        Vec_Int_t * vVar2Ids = (Vec_Int_t *)Vec_PtrEntry(&p->vVar2Ids, k);
        int iVarNew = Vec_IntSize( vVar2Ids );
        assert( iVarNew > 0 );
        Vec_IntPush( vVar2Ids, Aig_ObjId(pObj) );
        Vec_IntWriteEntry( vId2Vars, k, iVarNew );
        sat_solver_setnvars( pSat, iVarNew + 1 );
        if ( k == 0 && Saig_ObjIsLo(p->pAig, pObj) ) // initialize the register output
        {
            int Lit = Abc_Var2Lit( iVarNew, 1 );
            int RetValue = sat_solver_addclause( pSat, &Lit, &Lit + 1 );
            assert( RetValue == 1 );
            (void) RetValue;
            sat_solver_compress( pSat );
        }
        *pfNewVar = 1;
    }
    return Vec_IntEntry( vId2Vars, k );
}
int Pdr_ObjSatVar2( Pdr_Man_t * p, int k, Aig_Obj_t * pObj, int Level, int Pol )
{
    Vec_Int_t * vLits;
    sat_solver * pSat;
    int fNewVar = 0, iVarThis  = Pdr_ObjSatVar2FindOrAdd( p, k, pObj, &fNewVar );
    int * pLit, i, iVar, iClaBeg, iClaEnd, RetValue;
    if ( Aig_ObjIsCi(pObj) || !fNewVar )
        return iVarThis;
    iClaBeg = p->pCnf2->pObj2Clause[Aig_ObjId(pObj)];
    iClaEnd = iClaBeg + p->pCnf2->pObj2Count[Aig_ObjId(pObj)];
    assert( iClaBeg < iClaEnd );
    pSat = Pdr_ManSolver(p, k);
    vLits = Vec_WecEntry( p->vVLits, Level );
    for ( i = iClaBeg; i < iClaEnd; i++ )
    {
        Vec_IntClear( vLits );
        Vec_IntPush( vLits, Abc_Var2Lit( iVarThis, Abc_LitIsCompl(p->pCnf2->pClauses[i][0]) ) );
        for ( pLit = p->pCnf2->pClauses[i]+1; pLit < p->pCnf2->pClauses[i+1]; pLit++ )
        {
            iVar = Pdr_ObjSatVar2( p, k, Aig_ManObj(p->pAig, Abc_Lit2Var(*pLit)), Level+1, Pol );
            Vec_IntPush( vLits, Abc_Var2Lit( iVar, Abc_LitIsCompl(*pLit) ) );
        }
        RetValue = sat_solver_addclause( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits)+Vec_IntSize(vLits) );
        assert( RetValue );
        (void) RetValue;
    }
    return iVarThis;
}
#endif

/**Function*************************************************************

  Synopsis    [Returns SAT variable of the given object.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Pdr_ObjSatVar( Pdr_Man_t * p, int k, int Pol, Aig_Obj_t * pObj )
{
    if ( p->pPars->fMonoCnf )
        return Pdr_ObjSatVar1( p, k, pObj );
    else
        return Pdr_ObjSatVar2( p, k, pObj, 0, Pol );
}


/**Function*************************************************************

  Synopsis    [Returns register number for the given SAT variable.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int Pdr_ObjRegNum1( Pdr_Man_t * p, int k, int iSatVar )
{
    int RegId;
    assert( iSatVar >= 0 );
    // consider the case of auxiliary variable
    if ( iSatVar >= p->pCnf1->nVars )
        return -1;
    // consider the case of register output
    RegId = Vec_IntEntry( p->vVar2Reg, iSatVar );
    assert( RegId >= 0 && RegId < Aig_ManRegNum(p->pAig) );
    return RegId;
}

/**Function*************************************************************

  Synopsis    [Returns register number for the given SAT variable.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int Pdr_ObjRegNum2( Pdr_Man_t * p, int k, int iSatVar )
{
    Aig_Obj_t * pObj;
    int ObjId;
    Vec_Int_t * vVar2Ids = (Vec_Int_t *)Vec_PtrEntry(&p->vVar2Ids, k);
    assert( iSatVar > 0 && iSatVar < Vec_IntSize(vVar2Ids) );
    ObjId = Vec_IntEntry( vVar2Ids, iSatVar );
    if ( ObjId == -1 ) // activation variable
        return -1;
    pObj = Aig_ManObj( p->pAig, ObjId );
    if ( Saig_ObjIsLi( p->pAig, pObj ) )
        return Aig_ObjCioId(pObj)-Saig_ManPoNum(p->pAig);
    assert( 0 ); // should be called for register inputs only
    return -1;
}

/**Function*************************************************************

  Synopsis    [Returns register number for the given SAT variable.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Pdr_ObjRegNum( Pdr_Man_t * p, int k, int iSatVar )
{
    if ( p->pPars->fMonoCnf )
        return Pdr_ObjRegNum1( p, k, iSatVar );
    else
        return Pdr_ObjRegNum2( p, k, iSatVar );
}


/**Function*************************************************************

  Synopsis    [Returns the index of unused SAT variable.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Pdr_ManFreeVar( Pdr_Man_t * p, int k )
{
    if ( p->pPars->fMonoCnf )
        return sat_solver_nvars( Pdr_ManSolver(p, k) );
    else
    {
        Vec_Int_t * vVar2Ids = (Vec_Int_t *)Vec_PtrEntry( &p->vVar2Ids, k );
        Vec_IntPush( vVar2Ids, -1 );
        return Vec_IntSize( vVar2Ids ) - 1;
    }
}

/**Function*************************************************************

  Synopsis    [Creates SAT solver.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline sat_solver * Pdr_ManNewSolver1( sat_solver * pSat, Pdr_Man_t * p, int k, int fInit )
{
    Aig_Obj_t * pObj;
    int i;
    assert( pSat );
    if ( p->pCnf1 == NULL )
    {
        int nRegs = p->pAig->nRegs;
        p->pAig->nRegs = Aig_ManCoNum(p->pAig);
        p->pCnf1 = Cnf_DeriveWithMan( p->pCnfMan, p->pAig, Aig_ManCoNum(p->pAig) );
        p->pAig->nRegs = nRegs;
        assert( p->vVar2Reg == NULL );
        p->vVar2Reg = Vec_IntStartFull( p->pCnf1->nVars );
        Saig_ManForEachLi( p->pAig, pObj, i )
            Vec_IntWriteEntry( p->vVar2Reg, Pdr_ObjSatVar(p, k, 3, pObj), i );
    }
    pSat = (sat_solver *)Cnf_DataWriteIntoSolverInt( pSat, p->pCnf1, 1, fInit );
    sat_solver_set_runtime_limit( pSat, p->timeToStop );
    sat_solver_set_runid( pSat, p->pPars->RunId );
    sat_solver_set_stop_func( pSat, p->pPars->pFuncStop );
    return pSat;
}

/**Function*************************************************************

  Synopsis    [Creates SAT solver.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline sat_solver * Pdr_ManNewSolver2( sat_solver * pSat, Pdr_Man_t * p, int k, int fInit )
{
    Vec_Int_t * vVar2Ids;
    int i, Entry;
    assert( pSat );
    if ( p->pCnf2 == NULL )
    {
        p->pCnf2     = Cnf_DeriveOtherWithMan( p->pCnfMan, p->pAig, 0 );
#ifdef USE_PG
        p->pCnf2->pClaPols = Cnf_DataDeriveLitPolarities( p->pCnf2 );
#endif
        p->pvId2Vars = ABC_CALLOC( Vec_Int_t, Aig_ManObjNumMax(p->pAig) );
        Vec_PtrGrow( &p->vVar2Ids, 256 );
    }
    // update the variable mapping
    vVar2Ids = (Vec_Int_t *)Vec_PtrGetEntry( &p->vVar2Ids, k );
    if ( vVar2Ids == NULL )
    {
        vVar2Ids = Vec_IntAlloc( 500 );
        Vec_PtrWriteEntry( &p->vVar2Ids, k, vVar2Ids );
    }
    Vec_IntForEachEntry( vVar2Ids, Entry, i )
    {
        if ( Entry == -1 )
            continue;
        assert( Vec_IntEntry( p->pvId2Vars + Entry, k ) > 0 );
        Vec_IntWriteEntry( p->pvId2Vars + Entry, k, 0 );
    }
    Vec_IntClear( vVar2Ids );
    Vec_IntPush( vVar2Ids, -1 );
    // start the SAT solver
//    pSat = sat_solver_new();
    sat_solver_setnvars( pSat, 500 );
    sat_solver_set_runtime_limit( pSat, p->timeToStop );
    sat_solver_set_runid( pSat, p->pPars->RunId );
    sat_solver_set_stop_func( pSat, p->pPars->pFuncStop );
    return pSat;
}

/**Function*************************************************************

  Synopsis    [Creates SAT solver.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
sat_solver * Pdr_ManNewSolver( sat_solver * pSat, Pdr_Man_t * p, int k, int fInit )
{
    assert( pSat != NULL );
    if ( p->pPars->fMonoCnf )
        return Pdr_ManNewSolver1( pSat, p, k, fInit );
    else
        return Pdr_ManNewSolver2( pSat, p, k, fInit );
}


////////////////////////////////////////////////////////////////////////
///                       END OF FILE                                ///
////////////////////////////////////////////////////////////////////////


ABC_NAMESPACE_IMPL_END