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/********************* */
/*! \file ee_manager_distributed.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** 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 Management of a distributed approach for equality engines over
** all theories.
**/
#include "cvc4_private.h"
#ifndef CVC4__THEORY__EE_MANAGER_DISTRIBUTED__H
#define CVC4__THEORY__EE_MANAGER_DISTRIBUTED__H
#include <map>
#include <memory>
#include "theory/ee_manager.h"
#include "theory/uf/equality_engine.h"
namespace CVC4 {
namespace theory {
/**
* The (distributed) equality engine manager. This encapsulates an architecture
* in which all theories maintain their own copy of an equality engine.
*
* This class is not responsible for actually initializing equality engines in
* theories (since this class does not have access to the internals of Theory).
* Instead, it is only responsible for the construction of the equality
* engine objects themselves. TheoryEngine is responsible for querying this
* class during finishInit() to determine the equality engines to pass to each
* theories based on getEeTheoryInfo.
*
* This class is also responsible for setting up the master equality engine,
* which is used as a special communication channel to quantifiers engine (e.g.
* for ensuring quantifiers E-matching is aware of terms from all theories).
*/
class EqEngineManagerDistributed : public EqEngineManager
{
public:
EqEngineManagerDistributed(TheoryEngine& te);
~EqEngineManagerDistributed();
/**
* Initialize theories. This method allocates unique equality engines
* per theories and connects them to a master equality engine.
*/
void initializeTheories() override;
/** get the core equality engine */
eq::EqualityEngine* getCoreEqualityEngine() override;
private:
/** notify class for master equality engine */
class MasterNotifyClass : public theory::eq::EqualityEngineNotify
{
public:
MasterNotifyClass(QuantifiersEngine* qe) : d_quantEngine(qe) {}
/**
* Called when a new equivalence class is created in the master equality
* engine.
*/
void eqNotifyNewClass(TNode t) override;
bool eqNotifyTriggerPredicate(TNode predicate, bool value) override
{
return true;
}
bool eqNotifyTriggerTermEquality(TheoryId tag,
TNode t1,
TNode t2,
bool value) override
{
return true;
}
void eqNotifyConstantTermMerge(TNode t1, TNode t2) override {}
void eqNotifyMerge(TNode t1, TNode t2) override {}
void eqNotifyDisequal(TNode t1, TNode t2, TNode reason) override {}
private:
/** Pointer to quantifiers engine */
QuantifiersEngine* d_quantEngine;
};
/** The master equality engine notify class */
std::unique_ptr<MasterNotifyClass> d_masterEENotify;
/** The master equality engine. */
std::unique_ptr<eq::EqualityEngine> d_masterEqualityEngine;
};
} // namespace theory
} // namespace CVC4
#endif /* CVC4__THEORY__EE_MANAGER_DISTRIBUTED__H */
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