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/****************************************************************************** |
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* Top contributors (to current version): |
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* 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 the unsat core manager of SmtEngine. |
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*/ |
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#include "unsat_core_manager.h" |
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#include "expr/proof_node_algorithm.h" |
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#include "smt/assertions.h" |
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namespace cvc5 { |
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namespace smt { |
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void UnsatCoreManager::getUnsatCore(std::shared_ptr<ProofNode> pfn, |
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Assertions& as, |
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std::vector<Node>& core) |
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{ |
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Trace("unsat-core") << "UCManager::getUnsatCore: final proof: " << *pfn.get() |
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<< "\n"; |
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Assert(pfn->getRule() == PfRule::SCOPE); |
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std::vector<Node> fassumps; |
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expr::getFreeAssumptions(pfn->getChildren()[0].get(), fassumps); |
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Trace("unsat-core") << "UCManager::getUnsatCore: free assumptions: " |
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<< fassumps << "\n"; |
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context::CDList<Node>* al = as.getAssertionList(); |
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Assert(al != nullptr); |
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for (context::CDList<Node>::const_iterator i = al->begin(); i != al->end(); |
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++i) |
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{ |
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Trace("unsat-core") << "is assertion " << *i << " there?\n"; |
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if (std::find(fassumps.begin(), fassumps.end(), *i) != fassumps.end()) |
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{ |
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Trace("unsat-core") << "\tyes\n"; |
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core.push_back(*i); |
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} |
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} |
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if (Trace.isOn("unsat-core")) |
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{ |
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Trace("unsat-core") << "UCManager::getUnsatCore():\n"; |
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for (const Node& n : core) |
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{ |
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Trace("unsat-core") << "- " << n << "\n"; |
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} |
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} |
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} |
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void UnsatCoreManager::getRelevantInstantiations( |
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std::shared_ptr<ProofNode> pfn, |
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std::map<Node, std::vector<std::vector<Node>>>& insts) |
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{ |
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std::unordered_map<ProofNode*, bool> visited; |
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std::unordered_map<ProofNode*, bool>::iterator it; |
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std::vector<std::shared_ptr<ProofNode>> visit; |
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std::shared_ptr<ProofNode> cur; |
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visit.push_back(pfn); |
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do |
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{ |
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cur = visit.back(); |
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visit.pop_back(); |
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it = visited.find(cur.get()); |
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if (it != visited.end()) |
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{ |
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continue; |
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} |
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visited[cur.get()] = true; |
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const std::vector<std::shared_ptr<ProofNode>>& cs = cur->getChildren(); |
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if (cur->getRule() == PfRule::INSTANTIATE) |
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{ |
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const std::vector<Node>& instTerms = cur->getArguments(); |
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Assert(cs.size() == 1); |
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Node q = cs[0]->getResult(); |
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insts[q].push_back({instTerms.begin(), instTerms.end()}); |
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} |
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for (const std::shared_ptr<ProofNode>& cp : cs) |
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{ |
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visit.push_back(cp); |
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} |
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} while (!visit.empty()); |
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} |
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} // namespace smt |
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} // namespace cvc5 |