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/********************* */
/*! \file cadical.h
** \verbatim
** Top contributors (to current version):
** Mathias Preiner, Aina Niemetz, Liana Hadarean
** This file is part of the CVC4 project.
** Copyright (c) 2009-2021 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 Wrapper for CaDiCaL SAT Solver.
**
** Implementation of the CaDiCaL SAT solver for CVC4 (bitvectors).
**/
#include "cvc4_private.h"
#ifndef CVC4__PROP__CADICAL_H
#define CVC4__PROP__CADICAL_H
#ifdef CVC4_USE_CADICAL
#include "prop/sat_solver.h"
#include "util/stats_timer.h"
#include <cadical.hpp>
namespace CVC4 {
namespace prop {
class CadicalSolver : public SatSolver
{
friend class SatSolverFactory;
public:
~CadicalSolver() override;
ClauseId addClause(SatClause& clause, bool removable) override;
ClauseId addXorClause(SatClause& clause, bool rhs, bool removable) override;
SatVariable newVar(bool isTheoryAtom = false,
bool preRegister = false,
bool canErase = true) override;
SatVariable trueVar() override;
SatVariable falseVar() override;
SatValue solve() override;
SatValue solve(long unsigned int&) override;
SatValue solve(const std::vector<SatLiteral>& assumptions) override;
bool setPropagateOnly() override;
void getUnsatAssumptions(std::vector<SatLiteral>& assumptions) override;
void interrupt() override;
SatValue value(SatLiteral l) override;
SatValue modelValue(SatLiteral l) override;
unsigned getAssertionLevel() const override;
bool ok() const override;
private:
/**
* Private to disallow creation outside of SatSolverFactory.
* Function init() must be called after creation.
*/
CadicalSolver(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<CaDiCaL::Solver> d_solver;
/**
* Stores the current set of assumptions provided via solve() and is used to
* query the solver if a given assumption is false.
*/
std::vector<SatLiteral> d_assumptions;
unsigned d_nextVarIdx;
bool d_inSatMode;
SatVariable d_true;
SatVariable d_false;
struct Statistics
{
StatisticsRegistry* d_registry;
IntStat d_numSatCalls;
IntStat d_numVariables;
IntStat d_numClauses;
TimerStat d_solveTime;
Statistics(StatisticsRegistry* registry, const std::string& prefix);
~Statistics();
};
Statistics d_statistics;
};
} // namespace prop
} // namespace CVC4
#endif // CVC4_USE_CADICAL
#endif // CVC4__PROP__CADICAL_H
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