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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds |
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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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* The theory engine proof generator. |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__THEORY_ENGINE_PROOF_GENERATOR_H |
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#define CVC5__THEORY_ENGINE_PROOF_GENERATOR_H |
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#include <memory> |
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#include "context/cdhashmap.h" |
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#include "context/context.h" |
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#include "proof/lazy_proof.h" |
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#include "proof/proof_generator.h" |
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#include "proof/proof_node_manager.h" |
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#include "proof/trust_node.h" |
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namespace cvc5 { |
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/** |
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* A simple proof generator class used by the theory engine. This class |
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* stores proofs for TheoryEngine::getExplanation. |
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* |
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* Notice that this class could be made general purpose. Its main feature is |
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* storing lazy proofs for facts in a context-dependent manner. |
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*/ |
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class TheoryEngineProofGenerator : public ProofGenerator |
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{ |
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typedef context::CDHashMap<Node, std::shared_ptr<LazyCDProof>> |
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NodeLazyCDProofMap; |
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public: |
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TheoryEngineProofGenerator(ProofNodeManager* pnm, context::UserContext* u); |
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~TheoryEngineProofGenerator() {} |
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/** |
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* Make trust explanation. Called when lpf has a proof of lit from free |
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* assumptions in exp. |
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* |
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* This stores lpf in the map d_proofs below and returns the trust node for |
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* this propagation, which has TrustNodeKind TrustNodeKind::PROP_EXP. If this |
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* explanation already exists, then the previous explanation is taken, which |
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* also suffices for proving the implication. |
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*/ |
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TrustNode mkTrustExplain(TNode lit, |
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Node exp, |
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std::shared_ptr<LazyCDProof> lpf); |
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/** |
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* Get proof for, which expects implications corresponding to explained |
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* propagations (=> exp lit) registered by the above method. This currently |
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* involves calling the mkScope method of ProofNodeManager internally, which |
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* returns a closed proof. |
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*/ |
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std::shared_ptr<ProofNode> getProofFor(Node f) override; |
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/** Identify this generator (for debugging, etc..) */ |
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std::string identify() const override; |
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private: |
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/** The proof manager, used for allocating new ProofNode objects */ |
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ProofNodeManager* d_pnm; |
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/** Map from formulas to lazy CD proofs */ |
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NodeLazyCDProofMap d_proofs; |
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/** The false node */ |
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Node d_false; |
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}; |
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} // namespace cvc5 |
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#endif /* CVC5__THEORY_ENGINE_PROOF_GENERATOR_H */ |