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/********************* */
/*! \file sat_solver.h
** \verbatim
** Original author: Dejan Jovanovic
** Major contributors: Morgan Deters, Liana Hadarean
** Minor contributors (to current version): none
** This file is part of the CVC4 project.
** Copyright (c) 2009-2013 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief SAT Solver.
**
** SAT Solver.
**/
#include "cvc4_private.h"
#ifndef __CVC4__PROP__SAT_SOLVER_H
#define __CVC4__PROP__SAT_SOLVER_H
#include <string>
#include <stdint.h>
#include "util/statistics_registry.h"
#include "context/cdlist.h"
#include "prop/sat_solver_types.h"
namespace CVC4 {
namespace prop {
class TheoryProxy;
class SatSolver {
public:
/** Virtual destructor */
virtual ~SatSolver() { }
/** Assert a clause in the solver. */
virtual void addClause(SatClause& clause, bool removable) = 0;
/** Create a new boolean variable in the solver. */
virtual SatVariable newVar(bool theoryAtom = false) = 0;
/** Create a new (or return an existing) boolean variable representing the constant true */
virtual SatVariable trueVar() = 0;
/** Create a new (or return an existing) boolean variable representing the constant false */
virtual SatVariable falseVar() = 0;
/** Check the satisfiability of the added clauses */
virtual SatValue solve() = 0;
/** Check the satisfiability of the added clauses */
virtual SatValue solve(long unsigned int&) = 0;
/** Interrupt the solver */
virtual void interrupt() = 0;
/** Call value() during the search.*/
virtual SatValue value(SatLiteral l) = 0;
/** Call modelValue() when the search is done.*/
virtual SatValue modelValue(SatLiteral l) = 0;
/** Get the current assertion level */
virtual unsigned getAssertionLevel() const = 0;
};/* class SatSolver */
class BVSatSolverInterface: public SatSolver {
public:
/** Interface for notifications */
class Notify {
public:
virtual ~Notify() {};
/**
* If the notify returns false, the solver will break out of whatever it's currently doing
* with an "unknown" answer.
*/
virtual bool notify(SatLiteral lit) = 0;
/**
* Notify about a learnt clause.
*/
virtual void notify(SatClause& clause) = 0;
virtual void safePoint() = 0;
};/* class BVSatSolverInterface::Notify */
virtual void setNotify(Notify* notify) = 0;
virtual void markUnremovable(SatLiteral lit) = 0;
virtual void getUnsatCore(SatClause& unsatCore) = 0;
virtual void addMarkerLiteral(SatLiteral lit) = 0;
virtual SatValue propagate() = 0;
virtual void explain(SatLiteral lit, std::vector<SatLiteral>& explanation) = 0;
virtual SatValue assertAssumption(SatLiteral lit, bool propagate = false) = 0;
virtual void popAssumption() = 0;
};/* class BVSatSolverInterface */
class DPLLSatSolverInterface: public SatSolver {
public:
virtual void initialize(context::Context* context, prop::TheoryProxy* theoryProxy) = 0;
virtual void push() = 0;
virtual void pop() = 0;
virtual bool properExplanation(SatLiteral lit, SatLiteral expl) const = 0;
virtual void requirePhase(SatLiteral lit) = 0;
virtual bool flipDecision() = 0;
virtual bool isDecision(SatVariable decn) const = 0;
};/* class DPLLSatSolverInterface */
inline std::ostream& operator <<(std::ostream& out, prop::SatLiteral lit) {
out << lit.toString();
return out;
}
inline std::ostream& operator <<(std::ostream& out, const prop::SatClause& clause) {
out << "clause:";
for(unsigned i = 0; i < clause.size(); ++i) {
out << " " << clause[i];
}
out << ";";
return out;
}
inline std::ostream& operator <<(std::ostream& out, prop::SatValue val) {
std::string str;
switch(val) {
case prop::SAT_VALUE_UNKNOWN:
str = "_";
break;
case prop::SAT_VALUE_TRUE:
str = "1";
break;
case prop::SAT_VALUE_FALSE:
str = "0";
break;
default:
str = "Error";
break;
}
out << str;
return out;
}
}/* CVC4::prop namespace */
}/* CVC4 namespace */
#endif /* __CVC4__PROP__SAT_MODULE_H */
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