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/******************************************************************************
* Top contributors (to current version):
* Andrew Reynolds, Dejan Jovanovic, Tim King
*
* 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.
* ****************************************************************************
*
* SAT Solver.
*/
#include "cvc5_private.h"
#ifndef CVC5__PROP__SAT_H
#define CVC5__PROP__SAT_H
// Just defining this for now, since there's no other SAT solver bindings.
// Optional blocks below will be unconditionally included
#define CVC5_USE_MINISAT
#include <unordered_set>
#include "context/cdqueue.h"
#include "expr/node.h"
#include "proof/trust_node.h"
#include "prop/registrar.h"
#include "prop/sat_solver_types.h"
#include "theory/theory.h"
#include "theory/theory_preprocessor.h"
#include "util/resource_manager.h"
namespace cvc5 {
namespace decision {
class DecisionEngine;
}
class TheoryEngine;
namespace prop {
class PropEngine;
class CnfStream;
class SkolemDefManager;
/**
* The proxy class that allows the SatSolver to communicate with the theories
*/
class TheoryProxy : public Registrar
{
public:
TheoryProxy(PropEngine* propEngine,
TheoryEngine* theoryEngine,
decision::DecisionEngine* decisionEngine,
SkolemDefManager* skdm,
context::Context* context,
context::UserContext* userContext,
ProofNodeManager* pnm);
~TheoryProxy();
/** Finish initialize */
void finishInit(CnfStream* cnfStream);
/** Notify a lemma, possibly corresponding to a skolem definition */
void notifyAssertion(Node lem, TNode skolem = TNode::null());
void theoryCheck(theory::Theory::Effort effort);
void explainPropagation(SatLiteral l, SatClause& explanation);
void theoryPropagate(SatClause& output);
void enqueueTheoryLiteral(const SatLiteral& l);
SatLiteral getNextTheoryDecisionRequest();
SatLiteral getNextDecisionEngineRequest(bool& stopSearch);
bool theoryNeedCheck() const;
/**
* Notifies of a new variable at a decision level.
*/
void variableNotify(SatVariable var);
TNode getNode(SatLiteral lit);
void notifyRestart();
void spendResource(Resource r);
bool isDecisionEngineDone();
bool isDecisionRelevant(SatVariable var);
SatValue getDecisionPolarity(SatVariable var);
CnfStream* getCnfStream();
/**
* Call the preprocessor on node, return trust node corresponding to the
* rewrite.
*/
theory::TrustNode preprocessLemma(theory::TrustNode trn,
std::vector<theory::TrustNode>& newLemmas,
std::vector<Node>& newSkolems);
/**
* Call the preprocessor on node, return trust node corresponding to the
* rewrite.
*/
theory::TrustNode preprocess(TNode node,
std::vector<theory::TrustNode>& newLemmas,
std::vector<Node>& newSkolems);
/**
* Remove ITEs from the node.
*/
theory::TrustNode removeItes(TNode node,
std::vector<theory::TrustNode>& newLemmas,
std::vector<Node>& newSkolems);
/**
* Get the skolems within node and their corresponding definitions, store
* them in sks and skAsserts respectively. Note that this method does not
* necessary include all of the skolems in skAsserts. In other words, it
* collects from node only. To compute all skolems that node depends on
* requires calling this method again on each lemma in skAsserts until a
* fixed point is reached.
*/
void getSkolems(TNode node,
std::vector<Node>& skAsserts,
std::vector<Node>& sks);
/** Preregister term */
void preRegister(Node n) override;
private:
/** The prop engine we are using. */
PropEngine* d_propEngine;
/** The CNF engine we are using. */
CnfStream* d_cnfStream;
/** The decision engine we are using. */
decision::DecisionEngine* d_decisionEngine;
/** The theory engine we are using. */
TheoryEngine* d_theoryEngine;
/** Queue of asserted facts */
context::CDQueue<TNode> d_queue;
/**
* Set of all lemmas that have been "shared" in the portfolio---i.e.,
* all imported and exported lemmas.
*/
std::unordered_set<Node> d_shared;
/** The theory preprocessor */
theory::TheoryPreprocessor d_tpp;
/** The skolem definition manager */
SkolemDefManager* d_skdm;
}; /* class TheoryProxy */
} // namespace prop
} // namespace cvc5
#endif /* CVC5__PROP__SAT_H */
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