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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Dejan Jovanovic |
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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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* Management of a care graph based approach for theory combination. |
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*/ |
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#include "theory/combination_care_graph.h" |
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#include "expr/node_visitor.h" |
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#include "prop/prop_engine.h" |
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#include "theory/care_graph.h" |
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#include "theory/model_manager.h" |
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#include "theory/shared_solver.h" |
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#include "theory/theory_engine.h" |
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namespace cvc5 { |
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namespace theory { |
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CombinationCareGraph::CombinationCareGraph( |
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TheoryEngine& te, |
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Env& env, |
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const std::vector<Theory*>& paraTheories, |
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ProofNodeManager* pnm) |
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: CombinationEngine(te, env, paraTheories, pnm) |
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{ |
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} |
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CombinationCareGraph::~CombinationCareGraph() {} |
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void CombinationCareGraph::combineTheories() |
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{ |
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Trace("combineTheories") << "TheoryEngine::combineTheories()" << std::endl; |
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// Care graph we'll be building |
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CareGraph careGraph; |
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// get the care graph from the parametric theories |
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for (Theory* t : d_paraTheories) |
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{ |
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t->getCareGraph(&careGraph); |
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} |
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Trace("combineTheories") |
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<< "TheoryEngine::combineTheories(): care graph size = " |
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<< careGraph.size() << std::endl; |
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// Now add splitters for the ones we are interested in |
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prop::PropEngine* propEngine = d_te.getPropEngine(); |
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for (const CarePair& carePair : careGraph) |
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{ |
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Debug("combineTheories") |
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<< "TheoryEngine::combineTheories(): checking " << carePair.d_a << " = " |
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<< carePair.d_b << " from " << carePair.d_theory << std::endl; |
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// The equality in question (order for no repetition) |
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Node equality = carePair.d_a.eqNode(carePair.d_b); |
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// We need to split on it |
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Debug("combineTheories") |
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<< "TheoryEngine::combineTheories(): requesting a split " << std::endl; |
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TrustNode tsplit; |
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if (isProofEnabled()) |
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{ |
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// make proof of splitting lemma |
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tsplit = d_cmbsPg->mkTrustNodeSplit(equality); |
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} |
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else |
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{ |
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Node split = equality.orNode(equality.notNode()); |
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tsplit = TrustNode::mkTrustLemma(split, nullptr); |
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} |
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d_sharedSolver->sendLemma( |
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tsplit, carePair.d_theory, InferenceId::COMBINATION_SPLIT); |
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// Could check the equality status here: |
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// EqualityStatus es = getEqualityStatus(carePair.d_a, carePair.d_b); |
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// and only require true phase below if: |
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// es == EQUALITY_TRUE || es == EQUALITY_TRUE_IN_MODEL |
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// and require false phase below if: |
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// es == EQUALITY_FALSE_IN_MODEL |
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// This is supposed to force preference to follow what the theory models |
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// already have but it doesn't seem to make a big difference - need to |
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// explore more -Clark |
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Node e = d_valuation.ensureLiteral(equality); |
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propEngine->requirePhase(e, true); |
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} |
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} |
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bool CombinationCareGraph::buildModel() |
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{ |
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// building the model happens as a separate step |
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return d_mmanager->buildModel(); |
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} |
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} // namespace theory |
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} // namespace cvc5 |