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/**************************************************************************************************
MiniSat -- Copyright (c) 2005, Niklas Sorensson
http://www.cs.chalmers.se/Cs/Research/FormalMethods/MiniSat/
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute,
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
**************************************************************************************************/
// 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
//=================================================================================================
// 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 int sat_solver2_nvars(sat_solver2* s);
extern int sat_solver2_nclauses(sat_solver2* s);
extern int sat_solver2_nconflicts(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 );
// clause storage
extern void sat_solver2_store_alloc( sat_solver2 * s );
extern void sat_solver2_store_write( sat_solver2 * s, char * pFileName );
extern void sat_solver2_store_free( sat_solver2 * s );
extern void sat_solver2_store_mark_roots( sat_solver2 * s );
extern void sat_solver2_store_mark_clauses_a( sat_solver2 * s );
extern void * sat_solver2_store_release( sat_solver2 * s );
//=================================================================================================
// Solver representation:
struct clause_t;
typedef struct clause_t clause;
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.
// clauses
vecp clauses; // List of problem constraints. (contains: clause*)
vecp learnts; // List of learnt clauses. (contains: clause*)
// activities
// double var_inc; // Amount to bump next variable with.
// double var_decay; // INVERSE decay factor for variable activity: stores 1/decay.
int var_inc;
// int var_decay;
// float cla_inc; // Amount to bump next clause with.
int cla_inc; // Amount to bump next clause with.
// float cla_decay; // INVERSE decay factor for clause activity: stores 1/decay.
vecp* wlists; //
// double* activity; // A heuristic measurement of the activity of a variable.
unsigned*activity; // A heuristic measurement of the activity of a variable.
lbool* assigns; // Current values of variables.
int* orderpos; // Index in variable order.
clause** reasons; //
int* levels; //
lit* trail;
char* polarity;
clause* binary; // A temporary binary clause
lbool* tags; //
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 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.
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
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
// clause memory
int * pMemArray;
int nMemAlloc;
int nMemSize;
// int fSkipSimplify; // set to one to skip simplification of the clause database
int fNotUseRandom; // do not allow random decisions with a fixed probability
veci temp_clause; // temporary storage for a CNF clause
};
static 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 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 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 void sat_solver2_compress(sat_solver2* s)
{
if ( s->qtail != s->qhead )
{
int RetValue = sat_solver2_simplify(s);
assert( RetValue != 0 );
}
}
static int sat_solver2_final(sat_solver2* s, int ** ppArray)
{
*ppArray = s->conf_final.ptr;
return s->conf_final.size;
}
static int sat_solver2_set_runtime_limit(sat_solver2* s, int Limit)
{
int nRuntimeLimit = s->nRuntimeLimit;
s->nRuntimeLimit = Limit;
return nRuntimeLimit;
}
static int sat_solver2_set_random(sat_solver2* s, int fNotUseRandom)
{
int fNotUseRandomOld = s->fNotUseRandom;
s->fNotUseRandom = fNotUseRandom;
return fNotUseRandomOld;
}
ABC_NAMESPACE_HEADER_END
#endif
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