path: root/src/sat/bsat/satSolver2.h

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MiniSat -- Copyright (c) 2005, Niklas Sorensson
http://www.cs.chalmers.se/Cs/Research/FormalMethods/MiniSat/

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// Modified to compile with MS Visual Studio 6.0 by Alan Mishchenko

#ifndef satSolver2_h
#define satSolver2_h


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include "satVec.h"

ABC_NAMESPACE_HEADER_START

//#define USE_FLOAT_ACTIVITY2

//=================================================================================================
// Public interface:

struct sat_solver2_t;
typedef struct sat_solver2_t sat_solver2;

extern sat_solver2* sat_solver2_new(void);
extern void         sat_solver2_delete(sat_solver2* s);

extern int          sat_solver2_addclause(sat_solver2* s, lit* begin, lit* end);
extern int          sat_solver2_simplify(sat_solver2* s);
extern int          sat_solver2_solve(sat_solver2* s, lit* begin, lit* end, ABC_INT64_T nConfLimit, ABC_INT64_T nInsLimit, ABC_INT64_T nConfLimitGlobal, ABC_INT64_T nInsLimitGlobal);
extern void         sat_solver2_rollback(sat_solver2* s);

extern void         sat_solver2_setnvars(sat_solver2* s,int n);

extern void         Sat_Solver2WriteDimacs( sat_solver2 * p, char * pFileName, lit* assumptionsBegin, lit* assumptionsEnd, int incrementVars );
extern void         Sat_Solver2PrintStats( FILE * pFile, sat_solver2 * p );
extern int *        Sat_Solver2GetModel( sat_solver2 * p, int * pVars, int nVars );
extern void         Sat_Solver2DoubleClauses( sat_solver2 * p, int iVar );

// trace recording
extern void         sat_solver2TraceStart( sat_solver2 * pSat, char * pName );
extern void         sat_solver2TraceStop( sat_solver2 * pSat );
extern void         sat_solver2TraceWrite( sat_solver2 * pSat, int * pBeg, int * pEnd, int fRoot );

// global variables
extern int          var_is_partA (sat_solver2* s, int v);
extern void         var_set_partA(sat_solver2* s, int v, int partA);
// clause grouping (these two only work after creating a clause before the solver is called)
extern int          clause_is_partA (sat_solver2* s, int handle);
extern void         clause_set_partA(sat_solver2* s, int handle, int partA);
// other clause functions
extern int          clause_id(sat_solver2* s, int h);
 
// proof-based APIs
extern void *       Sat_ProofCore( sat_solver2 * s );
extern void *       Sat_ProofInterpolant( sat_solver2 * s, void * pGloVars );
extern word *       Sat_ProofInterpolantTruth( sat_solver2 * s, void * pGloVars );
extern void         Sat_ProofReduce( sat_solver2 * s );
extern void         Sat_ProofCheck( sat_solver2 * s );

//=================================================================================================
// Solver representation:

struct varinfo_t;
typedef struct varinfo2_t varinfo2;

struct sat_solver2_t
{
    int             size;           // nof variables
    int             cap;            // size of varmaps
    int             qhead;          // Head index of queue.
    int             qtail;          // Tail index of queue.

    int             root_level;     // Level of first proper decision.
    int             simpdb_assigns; // Number of top-level assignments at last 'simplifyDB()'.
    int             simpdb_props;   // Number of propagations before next 'simplifyDB()'.
    double          random_seed;
    double          progress_estimate;
    int             verbosity;      // Verbosity level. 0=silent, 1=some progress report, 2=everything    // activities

#ifdef USE_FLOAT_ACTIVITY2
    double          var_inc;        // Amount to bump next variable with.
    double          var_decay;      // INVERSE decay factor for variable activity: stores 1/decay. 
    float           cla_inc;        // Amount to bump next clause with.
    float           cla_decay;      // INVERSE decay factor for clause activity: stores 1/decay.
    double*         activity;       // A heuristic measurement of the activity of a variable.
#else
    int             var_inc;        // Amount to bump next variable with.
    int             cla_inc;        // Amount to bump next clause with.
    unsigned*       activity;       // A heuristic measurement of the activity of a variable.
#endif

    int             fNotUseRandom;  // do not allow random decisions with a fixed probability
    int             fSkipSimplify;  // set to one to skip simplification of the clause database
    int             fProofLogging;  // enable proof-logging

    // clauses
    veci            clauses;        // clause memory
    veci            learnts;        // learnt memory
    veci*           wlists;         // watcher lists (for each literal)
    int             hClausePivot;   // the pivot among problem clause
    int             hLearntPivot;   // the pivot among learned clause
    int             hLearntLast;    // in proof-logging mode, the ID of the final conflict clause (conf_final)
    int             iVarPivot;      // the pivot among the variables

    veci            claActs;        // clause activities
    veci            claProofs;      // clause proofs

    // internal state
    varinfo2 *      vi;             // variable information
    int*            levels;         // 
    char*           assigns;        // 
    lit*            trail;          // sequence of assignment and implications
    int*            orderpos;       // Index in variable order.
    cla*            reasons;        // reason clauses
    cla*            units;          // unit clauses

    veci            tagged;         // (contains: var)
    veci            stack;          // (contains: var)
    veci            order;          // Variable order. (heap) (contains: var)
    veci            trail_lim;      // Separator indices for different decision levels in 'trail'. (contains: int)
    veci            temp_clause;    // temporary storage for a CNF clause
    veci            model;          // If problem is solved, this vector contains the model (contains: lbool).
    veci            conf_final;     // If problem is unsatisfiable (possibly under assumptions),
                                    // this vector represent the final conflict clause expressed in the assumptions.
    veci            mark_levels;    // temporary storage for labeled levels
    veci            min_lit_order;  // ordering of removable literals
    veci            min_step_order; // ordering of resolution steps
    veci            learnt_live;    // remaining clauses after reduce DB

    // proof logging
    veci            proofs;         // sequence of proof records
    int             iStartChain;    // temporary variable to remember beginning of the current chain in proof logging
    int             nUnits;         // the total number of unit clauses

    // statistics
    stats_t         stats;
    ABC_INT64_T     nConfLimit;     // external limit on the number of conflicts
    ABC_INT64_T     nInsLimit;      // external limit on the number of implications
    int             nRuntimeLimit;  // external limit on runtime
};

typedef struct satset_t satset;
struct satset_t 
{
    unsigned learnt :  1;
    unsigned mark   :  1;
    unsigned partA  :  1;
    unsigned nEnts  : 29;
    int      Id;
    lit      pEnts[0];
};

static inline satset* satset_read   (veci* p, cla h )     { return h ? (satset*)(veci_begin(p) + h) : NULL;                           }
static inline cla     satset_handle (veci* p, satset* c)  { return (cla)((int *)c - veci_begin(p));                                   }
static inline int     satset_check  (veci* p, satset* c)  { return (int*)c > veci_begin(p) && (int*)c < veci_begin(p) + veci_size(p); }
static inline int     satset_size   (int nLits)           { return sizeof(satset)/4 + nLits;                                          }
static inline void    satset_print  (satset * c)          { 
    int i;
    printf( "{ " );
    for ( i = 0; i < (int)c->nEnts; i++ )
        printf( "%d ", (c->pEnts[i] & 1)? -(c->pEnts[i] >> 1) : c->pEnts[i] >> 1 );
    printf( "}\n" );
}

#define satset_foreach_entry( p, c, h, s )            \
    for ( h = s; (h < veci_size(p)) && (((c) = satset_read(p, h)), 1); h += satset_size(c->nEnts) )
#define satset_foreach_entry_vec( pVec, p, c, i )     \
    for ( i = 0; (i < veci_size(pVec)) && ((c) = satset_read(p, veci_begin(pVec)[i])); i++ )
#define satset_foreach_var( p, var, i, start )        \
    for ( i = start; (i < (int)(p)->nEnts) && ((var) = lit_var((p)->pEnts[i])); i++ )
#define satset_foreach_lit( p, lit, i, start )        \
    for ( i = start; (i < (int)(p)->nEnts) && ((lit) = (p)->pEnts[i]); i++ )

#define sat_solver_foreach_clause( s, c, h )  satset_foreach_entry( &s->clauses, c, h, 1 )
#define sat_solver_foreach_learnt( s, c, h )  satset_foreach_entry( &s->learnts, c, h, 1 )

//=================================================================================================
// Public APIs:

static inline int sat_solver2_nvars(sat_solver2* s)
{
    return s->size;
}

static inline int sat_solver2_nclauses(sat_solver2* s)
{
    return (int)s->stats.clauses;
}

static inline int sat_solver2_nconflicts(sat_solver2* s)
{
    return (int)s->stats.conflicts;
}

static inline int sat_solver2_var_value( sat_solver2* s, int v ) 
{
    assert( s->model.ptr != NULL && v < s->size );
    return (int)(s->model.ptr[v] == l_True);
}
static inline int sat_solver2_var_literal( sat_solver2* s, int v ) 
{
    assert( s->model.ptr != NULL && v < s->size );
    return toLitCond( v, s->model.ptr[v] != l_True );
}
static inline void sat_solver2_act_var_clear(sat_solver2* s) 
{
    int i;
    for (i = 0; i < s->size; i++)
        s->activity[i] = 0;//.0;
    s->var_inc = 1.0;
}
static inline void sat_solver2_compress(sat_solver2* s) 
{
    if ( s->qtail != s->qhead )
    {
        int RetValue = sat_solver2_simplify(s);
        assert( RetValue != 0 );
    }
}

static inline int sat_solver2_final(sat_solver2* s, int ** ppArray)
{
    *ppArray = s->conf_final.ptr;
    return s->conf_final.size;
}

static inline int sat_solver2_set_runtime_limit(sat_solver2* s, int Limit)
{
    int nRuntimeLimit = s->nRuntimeLimit;
    s->nRuntimeLimit = Limit;
    return nRuntimeLimit;
}

static inline int sat_solver2_set_random(sat_solver2* s, int fNotUseRandom)
{
    int fNotUseRandomOld = s->fNotUseRandom;
    s->fNotUseRandom = fNotUseRandom;
    return fNotUseRandomOld;
}

static inline int sat_solver2_bookmark(sat_solver2* s)
{
    s->hLearntPivot = veci_size(&s->learnts);
    s->hClausePivot = veci_size(&s->clauses);
    s->iVarPivot    = s->size;
}

ABC_NAMESPACE_HEADER_END

#endif