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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Haniel Barbosa |
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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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* Implementation of a proof generator for buffered proof steps. |
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*/ |
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#include "expr/buffered_proof_generator.h" |
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#include "expr/proof.h" |
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#include "expr/proof_node_manager.h" |
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namespace cvc5 { |
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BufferedProofGenerator::BufferedProofGenerator(context::Context* c, |
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ProofNodeManager* pnm) |
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: ProofGenerator(), d_facts(c), d_pnm(pnm) |
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{ |
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} |
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bool BufferedProofGenerator::addStep(Node fact, |
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ProofStep ps, |
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CDPOverwrite opolicy) |
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{ |
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// check duplicates if we are not always overwriting |
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if (opolicy != CDPOverwrite::ALWAYS) |
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{ |
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if (d_facts.find(fact) != d_facts.end()) |
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{ |
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// duplicate |
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return false; |
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} |
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Node symFact = CDProof::getSymmFact(fact); |
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if (!symFact.isNull()) |
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{ |
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if (d_facts.find(symFact) != d_facts.end()) |
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{ |
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// duplicate due to symmetry |
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return false; |
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} |
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} |
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} |
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// note that this replaces the value fact is mapped to if there is already one |
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d_facts.insert(fact, std::make_shared<ProofStep>(ps)); |
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return true; |
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} |
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std::shared_ptr<ProofNode> BufferedProofGenerator::getProofFor(Node fact) |
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{ |
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Trace("pfee-fact-gen") << "BufferedProofGenerator::getProofFor: " << fact |
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<< std::endl; |
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NodeProofStepMap::iterator it = d_facts.find(fact); |
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if (it == d_facts.end()) |
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{ |
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Node symFact = CDProof::getSymmFact(fact); |
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if (symFact.isNull()) |
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{ |
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Trace("pfee-fact-gen") << "...cannot find step" << std::endl; |
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Assert(false); |
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return nullptr; |
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} |
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it = d_facts.find(symFact); |
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if (it == d_facts.end()) |
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{ |
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Assert(false); |
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Trace("pfee-fact-gen") << "...cannot find step (no sym)" << std::endl; |
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return nullptr; |
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} |
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} |
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Trace("pfee-fact-gen") << "...return via step " << *(*it).second << std::endl; |
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CDProof cdp(d_pnm); |
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cdp.addStep(fact, *(*it).second); |
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return cdp.getProofFor(fact); |
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} |
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bool BufferedProofGenerator::hasProofFor(Node f) |
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{ |
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NodeProofStepMap::iterator it = d_facts.find(f); |
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if (it == d_facts.end()) |
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{ |
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Node symFact = CDProof::getSymmFact(f); |
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if (symFact.isNull()) |
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{ |
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return false; |
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} |
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it = d_facts.find(symFact); |
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if (it == d_facts.end()) |
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{ |
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return false; |
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} |
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} |
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return true; |
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} |
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} // namespace cvc5 |