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/****************************************************************************** |
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* Top contributors (to current version): |
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* Kshitij Bansal, Andrew Reynolds, Aina Niemetz |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Decision engine. |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__DECISION__DECISION_ENGINE_H |
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#define CVC5__DECISION__DECISION_ENGINE_H |
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#include "expr/node.h" |
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#include "prop/cnf_stream.h" |
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#include "prop/sat_solver.h" |
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#include "prop/sat_solver_types.h" |
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namespace cvc5 { |
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namespace decision { |
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class DecisionEngine |
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{ |
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public: |
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/** Constructor */ |
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DecisionEngine(context::Context* sc, |
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ResourceManager* rm); |
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virtual ~DecisionEngine() {} |
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/** Finish initialize */ |
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void finishInit(prop::CDCLTSatSolverInterface* ss, prop::CnfStream* cs); |
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/** Presolve, called at the beginning of each check-sat call */ |
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virtual void presolve() {} |
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/** |
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* Gets the next decision based on strategies that are enabled. This sets |
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* stopSearch to true if no further SAT variables need to be assigned in |
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* this SAT context. |
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*/ |
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prop::SatLiteral getNext(bool& stopSearch); |
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/** Is the DecisionEngine in a state where it has solved everything? */ |
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virtual bool isDone() = 0; |
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/** |
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* Notify this class that assertion is an (input) assertion, not corresponding |
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* to a skolem definition. |
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*/ |
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virtual void addAssertion(TNode assertion) = 0; |
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/** |
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* Notify this class that lem is the skolem definition for skolem, which is |
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* a part of the current assertions. |
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*/ |
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virtual void addSkolemDefinition(TNode lem, TNode skolem) = 0; |
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/** |
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* Notify this class that the literal n has been asserted, possibly |
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* propagated by the SAT solver. |
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*/ |
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virtual void notifyAsserted(TNode n) {} |
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protected: |
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/** Get next internal, the engine-specific implementation of getNext */ |
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virtual prop::SatLiteral getNextInternal(bool& stopSearch) = 0; |
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/** Pointer to the SAT context */ |
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context::Context* d_context; |
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/** Pointer to resource manager for associated SmtEngine */ |
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ResourceManager* d_resourceManager; |
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/** Pointer to the CNF stream */ |
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prop::CnfStream* d_cnfStream; |
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/** Pointer to the SAT solver */ |
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prop::CDCLTSatSolverInterface* d_satSolver; |
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}; |
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/** |
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* Instance of the above class which does nothing. This is used when |
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* the decision mode is set to internal. |
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*/ |
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class DecisionEngineEmpty : public DecisionEngine |
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{ |
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public: |
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DecisionEngineEmpty(context::Context* sc, ResourceManager* rm); |
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bool isDone() override; |
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void addAssertion(TNode assertion) override; |
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void addSkolemDefinition(TNode lem, TNode skolem) override; |
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protected: |
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prop::SatLiteral getNextInternal(bool& stopSearch) override; |
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}; |
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} // namespace decision |
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} // namespace cvc5 |
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#endif /* CVC5__DECISION__DECISION_ENGINE_H */ |