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/********************* */
/*! \file cryptominisat.h
** \verbatim
** Top contributors (to current version):
** Mathias Preiner, Liana Hadarean, Aina Niemetz
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief SAT Solver.
**
** Implementation of the cryptominisat sat solver for cvc4 (bitvectors).
**/
#include "cvc4_private.h"
#ifndef CVC4__PROP__CRYPTOMINISAT_H
#define CVC4__PROP__CRYPTOMINISAT_H
#ifdef CVC4_USE_CRYPTOMINISAT
#include "proof/clausal_bitvector_proof.h"
#include "prop/sat_solver.h"
// Cryptominisat has name clashes with the other Minisat implementations since
// the Minisat implementations export var_Undef, l_True, ... as macro whereas
// Cryptominisat uses static const. In order to avoid these conflicts we
// forward declare CMSat::SATSolver and include the cryptominisat header only
// in cryptominisat.cpp.
namespace CMSat {
class SATSolver;
}
namespace CVC4 {
namespace prop {
class CryptoMinisatSolver : public SatSolver
{
friend class SatSolverFactory;
public:
~CryptoMinisatSolver() override;
ClauseId addClause(SatClause& clause, bool removable) override;
ClauseId addXorClause(SatClause& clause, bool rhs, bool removable) override;
bool nativeXor() override { return true; }
SatVariable newVar(bool isTheoryAtom = false,
bool preRegister = false,
bool canErase = true) override;
SatVariable trueVar() override;
SatVariable falseVar() override;
void markUnremovable(SatLiteral lit);
void interrupt() override;
SatValue solve() override;
SatValue solve(long unsigned int&) override;
SatValue solve(const std::vector<SatLiteral>& assumptions) override;
bool ok() const override;
SatValue value(SatLiteral l) override;
SatValue modelValue(SatLiteral l) override;
unsigned getAssertionLevel() const override;
void setClausalProofLog(proof::ClausalBitVectorProof* bvp) override;
private:
class Statistics
{
public:
StatisticsRegistry* d_registry;
IntStat d_statCallsToSolve;
IntStat d_xorClausesAdded;
IntStat d_clausesAdded;
TimerStat d_solveTime;
bool d_registerStats;
Statistics(StatisticsRegistry* registry, const std::string& prefix);
~Statistics();
};
/**
* Private to disallow creation outside of SatSolverFactory.
* Function init() must be called after creation.
*/
CryptoMinisatSolver(StatisticsRegistry* registry,
const std::string& name = "");
/**
* Initialize SAT solver instance.
* Note: Split out to not call virtual functions in constructor.
*/
void init();
std::unique_ptr<CMSat::SATSolver> d_solver;
proof::ClausalBitVectorProof* d_bvp;
unsigned d_numVariables;
bool d_okay;
SatVariable d_true;
SatVariable d_false;
Statistics d_statistics;
};
} // namespace prop
} // namespace CVC4
#endif // CVC4_USE_CRYPTOMINISAT
#endif // CVC4__PROP__CRYPTOMINISAT_H
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