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/********************* */
/*! \file prop_engine.h
** \verbatim
** Original author: mdeters
** Major contributors: taking, dejan
** Minor contributors (to current version): cconway
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief The PropEngine (proposiitonal engine); main interface point
** between CVC4's SMT infrastructure and the SAT solver.
**
** The PropEngine (proposiitonal engine); main interface point
** between CVC4's SMT infrastructure and the SAT solver.
**/
#include "cvc4_private.h"
#ifndef __CVC4__PROP_ENGINE_H
#define __CVC4__PROP_ENGINE_H
#include "expr/node.h"
#include "util/result.h"
#include "util/decision_engine.h"
#include "smt/options.h"
namespace CVC4 {
class TheoryEngine;
namespace prop {
class CnfStream;
class SatSolver;
/**
* PropEngine is the abstraction of a Sat Solver, providing methods for
* solving the SAT problem and conversion to CNF (via the CnfStream).
*/
class PropEngine {
/**
* Indicates that the sat solver is currently solving something and we should
* not mess with it's internal state.
*/
bool d_inCheckSat;
/** The global options */
//const Options d_options;
/** The decision engine we will be using */
DecisionEngine *d_decisionEngine;
/** The theory engine we will be using */
TheoryEngine *d_theoryEngine;
context::Context* d_context;
/** The SAT solver proxy */
SatSolver* d_satSolver;
/** List of all of the assertions that need to be made */
std::vector<Node> d_assertionList;
/** The CNF converter in use */
CnfStream* d_cnfStream;
void printSatisfyingAssignment();
public:
/**
* Create a PropEngine with a particular decision and theory engine.
*/
PropEngine(DecisionEngine*, TheoryEngine*, context::Context*, const Options&);
/**
* Destructor.
*/
CVC4_PUBLIC ~PropEngine();
/**
* This is called by SmtEngine, at shutdown time, just before
* destruction. It is important because there are destruction
* ordering issues between some parts of the system (notably between
* PropEngine and Theory). For now, there's nothing to do here in
* the PropEngine.
*/
void shutdown() { }
/**
* Converts the given formula to CNF and assert the CNF to the sat solver.
* The formula is asserted permanently for the current context.
* @param node the formula to assert
*/
void assertFormula(TNode node);
/**
* Converts the given formula to CNF and assert the CNF to the sat solver.
* The formula can be removed by the sat solver after backtracking lower
* than the (SAT and SMT) level at which it was asserted.
*
* @param node the formula to assert
*/
void assertLemma(TNode node);
/**
* Checks the current context for satisfiability.
*/
Result checkSat();
/**
* Get the value of a boolean variable.
*
* @return mkConst<true>, mkConst<false>, or Node::null() if
* unassigned.
*/
Node getValue(TNode node);
/**
* Push the context level.
*/
void push();
/**
* Pop the context level.
*/
void pop();
};/* class PropEngine */
}/* CVC4::prop namespace */
}/* CVC4 namespace */
#endif /* __CVC4__PROP_ENGINE_H */
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