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/******************************************************************************
* Top contributors (to current version):
* Liana Hadarean, Haniel Barbosa, Andres Noetzli
*
* 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.
* ****************************************************************************
*
* A manager for CnfProofs.
*/
#include "cvc5_private.h"
#ifndef CVC5__CNF_PROOF_H
#define CVC5__CNF_PROOF_H
#include <unordered_map>
#include <unordered_set>
#include "context/cdhashmap.h"
#include "proof/clause_id.h"
#include "proof/proof_manager.h"
namespace cvc5 {
namespace prop {
class CnfStream;
} // namespace prop
class CnfProof;
typedef std::unordered_map<Node, Node, NodeHashFunction> NodeToNode;
typedef std::unordered_set<ClauseId> ClauseIdSet;
typedef context::CDHashMap<ClauseId, Node> ClauseIdToNode;
typedef std::pair<Node, Node> NodePair;
typedef std::set<NodePair> NodePairSet;
typedef std::unordered_set<Node, NodeHashFunction> NodeSet;
class CnfProof {
protected:
cvc5::prop::CnfStream* d_cnfStream;
/** Map from ClauseId to the assertion that lead to adding this clause **/
ClauseIdToNode d_clauseToAssertion;
/** Top of stack is assertion currently being converted to CNF. Also saves
* whether it is input (rather than a lemma). **/
std::vector<std::pair<Node, bool>> d_currentAssertionStack;
/** Map from top-level fact to facts/assertion that it follows from **/
NodeToNode d_cnfDeps;
ClauseIdSet d_explanations;
// The clause ID of the unit clause defining the true SAT literal.
ClauseId d_trueUnitClause;
// The clause ID of the unit clause defining the false SAT literal.
ClauseId d_falseUnitClause;
std::string d_name;
public:
CnfProof(cvc5::prop::CnfStream* cnfStream,
context::Context* ctx,
const std::string& name);
~CnfProof();
/** Methods for logging what the CnfStream does **/
// map the clause back to the current assertion where it came from
void registerConvertedClause(ClauseId clause);
/** Clause is one of the clauses defining top-level assertion node*/
void setClauseAssertion(ClauseId clause, Node node);
/** Current assertion being converted and whether it is an input (rather than
* a lemma) */
void pushCurrentAssertion(Node assertion, bool isInput = false);
void popCurrentAssertion();
Node getCurrentAssertion();
bool getCurrentAssertionKind();
/**
* Checks whether the assertion stack is empty.
*/
bool isAssertionStackEmpty() const { return d_currentAssertionStack.empty(); }
// accessors for the leaf assertions that are being converted to CNF
Node getAssertionForClause(ClauseId clause);
};/* class CnfProof */
} // namespace cvc5
#endif /* CVC5__CNF_PROOF_H */
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