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/********************* */
/*! \file proof_engine_output_channel.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2019 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 The proof output channel class
**/
#include "cvc4_private.h"
#ifndef CVC4__THEORY__PROOF_ENGINE_OUTPUT_CHANNEL_H
#define CVC4__THEORY__PROOF_ENGINE_OUTPUT_CHANNEL_H
#include "context/cdhashmap.h"
#include "expr/node.h"
#include "theory/engine_output_channel.h"
namespace CVC4 {
class LazyCDProof;
namespace theory {
/**
* TODO: merge with engine output channel
*
* A layer on top of an output channel to ensure proofs are constructed and
* available for conflicts and lemmas that may require proofs. It is
* intended to be owned by TheoryEngine and passed as reference to each of
* its Theory solvers. Its use can be summarized in two parts:
*
* (1) Theory objects should use the output calls to methods in this class,
* e.g. trustedConflict(...), trustedLemma(...).
*
* (2) This class is responsible for adding proof steps to the provide proof
* object that correspond to steps.
*
* It is implemented by requiring that calls to conflict(...) provide an
* pointer to a proof generator object, as part of the TrustNode pair.
*
* In more detail, when a call to
* ProofOutputChannel::trustedConflict(TrustNode(conf, pfg))
* is made
*/
class ProofEngineOutputChannel : public EngineOutputChannel
{
typedef context::CDHashMap<Node, ProofGenerator*, NodeHashFunction>
NodeProofGenMap;
public:
ProofEngineOutputChannel(TheoryEngine* engine,
theory::TheoryId theory,
LazyCDProof* lpf);
~ProofEngineOutputChannel() {}
/**
* Let pconf be the pair (Node conf, ProofGenerator * pfg). This method
* sends conf on the output channel of this class whose proof can be generated
* by the generator pfg. It stores the mapping
* getConflictKeyValue(conf) |-> pfg
* as a (lazy) step in the lazy proof object owned by this class.
*/
void trustedConflict(TrustNode pconf) override;
/**
* Let plem be the pair (Node lem, ProofGenerator * pfg).
* Send lem on the output channel of this class whose proof can be generated
* by the generator pfg. Apart from pfg, the interface for this method is
* the same as OutputChannel. It stores the mapping
* getLemmaKeyValue(lem) |-> pfg
* as a (lazy) step in the lazy proof object owned by this class.
*/
LemmaStatus trustedLemma(TrustNode plem,
bool removable = false,
bool preprocess = false,
bool sendAtoms = false) override;
private:
/** Pointer to the lazy proof
*
* This object stores the mapping between formulas (conflicts or lemmas)
* and the proof generator provided for them.
*/
LazyCDProof* d_lazyPf;
/**
* Add coarse grained THEORY_LEMMA step for formula f that is the key of
* a lemma or conflict being sent out on the output channel of this class.
*/
bool addTheoryLemmaStep(Node f);
};
} // namespace theory
} // namespace CVC4
#endif /* CVC4__THEORY__PROOF_OUTPUT_CHANNEL_H */
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