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/******************************************************************************
* Top contributors (to current version):
* Kshitij Bansal, Andrew Reynolds, Aina Niemetz
*
* This file is part of the cvc5 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.
* ****************************************************************************
*
* Decision engine.
*/
#include "cvc5_private.h"
#ifndef CVC5__DECISION__DECISION_ENGINE_H
#define CVC5__DECISION__DECISION_ENGINE_H
#include "expr/node.h"
#include "prop/cnf_stream.h"
#include "prop/sat_solver.h"
#include "prop/sat_solver_types.h"
#include "smt/env_obj.h"
namespace cvc5 {
namespace decision {
class DecisionEngine : protected EnvObj
{
public:
/** Constructor */
DecisionEngine(Env& env);
virtual ~DecisionEngine() {}
/** Finish initialize */
void finishInit(prop::CDCLTSatSolverInterface* ss, prop::CnfStream* cs);
/** Presolve, called at the beginning of each check-sat call */
virtual void presolve() {}
/**
* Gets the next decision based on strategies that are enabled. This sets
* stopSearch to true if no further SAT variables need to be assigned in
* this SAT context.
*/
prop::SatLiteral getNext(bool& stopSearch);
/** Is the DecisionEngine in a state where it has solved everything? */
virtual bool isDone() = 0;
/**
* Notify this class that assertion is an (input) assertion, not corresponding
* to a skolem definition.
*/
virtual void addAssertion(TNode assertion, bool isLemma) = 0;
/**
* Notify this class that lem is the skolem definition for skolem, which is
* a part of the current assertions.
*/
virtual void addSkolemDefinition(TNode lem, TNode skolem, bool isLemma) = 0;
/**
* Notify this class that the list of lemmas defs are now active in the
* current SAT context.
*/
virtual void notifyActiveSkolemDefs(std::vector<TNode>& defs) {}
/**
* Track active skolem defs, whether we need to call the above method
* when appropriate.
*/
virtual bool needsActiveSkolemDefs() const { return false; }
protected:
/** Get next internal, the engine-specific implementation of getNext */
virtual prop::SatLiteral getNextInternal(bool& stopSearch) = 0;
/** Pointer to the SAT context */
context::Context* d_context;
/** Pointer to resource manager for associated SolverEngine */
ResourceManager* d_resourceManager;
/** Pointer to the CNF stream */
prop::CnfStream* d_cnfStream;
/** Pointer to the SAT solver */
prop::CDCLTSatSolverInterface* d_satSolver;
};
/**
* Instance of the above class which does nothing. This is used when
* the decision mode is set to internal.
*/
class DecisionEngineEmpty : public DecisionEngine
{
public:
DecisionEngineEmpty(Env& env);
bool isDone() override;
void addAssertion(TNode assertion, bool isLemma) override;
void addSkolemDefinition(TNode lem, TNode skolem, bool isLemma) override;
protected:
prop::SatLiteral getNextInternal(bool& stopSearch) override;
};
} // namespace decision
} // namespace cvc5
#endif /* CVC5__DECISION__DECISION_ENGINE_H */
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