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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Aina Niemetz, Mathias Preiner |
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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 model builder class. |
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*/ |
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#include "theory/quantifiers/fmf/model_builder.h" |
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#include "options/quantifiers_options.h" |
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#include "options/strings_options.h" |
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#include "theory/quantifiers/first_order_model.h" |
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#include "theory/quantifiers/fmf/model_engine.h" |
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#include "theory/quantifiers/instantiate.h" |
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#include "theory/quantifiers/quant_rep_bound_ext.h" |
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#include "theory/quantifiers/quantifiers_state.h" |
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using namespace std; |
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using namespace cvc5; |
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using namespace cvc5::kind; |
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using namespace cvc5::context; |
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using namespace cvc5::theory; |
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using namespace cvc5::theory::quantifiers; |
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QModelBuilder::QModelBuilder(Env& env, |
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QuantifiersState& qs, |
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QuantifiersInferenceManager& qim, |
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QuantifiersRegistry& qr, |
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TermRegistry& tr) |
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: TheoryEngineModelBuilder(env), |
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d_addedLemmas(0), |
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d_triedLemmas(0), |
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d_qstate(qs), |
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d_qim(qim), |
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d_qreg(qr), |
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d_treg(tr), |
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d_model(nullptr) |
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{ |
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} |
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void QModelBuilder::finishInit() |
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{ |
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// allocate the default model |
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d_modelAloc.reset(new FirstOrderModel(d_env, d_qstate, d_qreg, d_treg)); |
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d_model = d_modelAloc.get(); |
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} |
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bool QModelBuilder::optUseModel() { |
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return options::mbqiMode() != options::MbqiMode::NONE || options::fmfBound() |
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|| options::stringExp(); |
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} |
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bool QModelBuilder::preProcessBuildModel(TheoryModel* m) { |
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return preProcessBuildModelStd( m ); |
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} |
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bool QModelBuilder::preProcessBuildModelStd(TheoryModel* m) { |
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d_addedLemmas = 0; |
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d_triedLemmas = 0; |
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if (options::fmfFunWellDefinedRelevant()) |
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{ |
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//traverse equality engine |
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std::map< TypeNode, bool > eqc_usort; |
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eq::EqClassesIterator eqcs_i = |
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eq::EqClassesIterator(m->getEqualityEngine()); |
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while( !eqcs_i.isFinished() ){ |
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TypeNode tr = (*eqcs_i).getType(); |
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eqc_usort[tr] = true; |
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++eqcs_i; |
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} |
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//look at quantified formulas |
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for (size_t i = 0, nquant = d_model->getNumAssertedQuantifiers(); |
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i < nquant; |
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i++) |
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{ |
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Node q = d_model->getAssertedQuantifier(i, true); |
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if (d_model->isQuantifierActive(q)) |
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{ |
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//check if any of these quantified formulas can be set inactive |
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if (q[0].getNumChildren() == 1) |
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{ |
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TypeNode tn = q[0][0].getType(); |
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if (tn.getAttribute(AbsTypeFunDefAttribute())) |
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{ |
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// we are allowed to assume the introduced type is empty |
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if (eqc_usort.find(tn) == eqc_usort.end()) |
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{ |
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Trace("model-engine-debug") |
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<< "Irrelevant function definition : " << q << std::endl; |
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d_model->setQuantifierActive(q, false); |
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} |
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} |
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} |
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} |
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} |
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} |
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return true; |
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} |
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void QModelBuilder::debugModel( TheoryModel* m ){ |
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//debug the model: cycle through all instantiations for all quantifiers, report ones that are not true |
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if( Trace.isOn("quant-check-model") ){ |
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FirstOrderModel* fm = d_model; |
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Trace("quant-check-model") << "Testing quantifier instantiations..." << std::endl; |
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int tests = 0; |
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int bad = 0; |
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QuantifiersBoundInference& qbi = d_qreg.getQuantifiersBoundInference(); |
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Instantiate* inst = d_qim.getInstantiate(); |
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for( unsigned i=0; i<fm->getNumAssertedQuantifiers(); i++ ){ |
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Node f = fm->getAssertedQuantifier( i ); |
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std::vector< Node > vars; |
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for( unsigned j=0; j<f[0].getNumChildren(); j++ ){ |
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vars.push_back( f[0][j] ); |
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} |
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QRepBoundExt qrbe(qbi, fm); |
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RepSetIterator riter(m->getRepSet(), &qrbe); |
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if( riter.setQuantifier( f ) ){ |
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while( !riter.isFinished() ){ |
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tests++; |
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std::vector< Node > terms; |
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for (unsigned k = 0; k < riter.getNumTerms(); k++) |
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{ |
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terms.push_back( riter.getCurrentTerm( k ) ); |
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} |
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Node n = inst->getInstantiation(f, vars, terms); |
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Node val = m->getValue(n); |
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if (!val.isConst() || !val.getConst<bool>()) |
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{ |
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Trace("quant-check-model") << "******* Instantiation " << n << " for " << std::endl; |
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Trace("quant-check-model") << " " << f << std::endl; |
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Trace("quant-check-model") << " Evaluates to " << val << std::endl; |
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bad++; |
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} |
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riter.increment(); |
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} |
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Trace("quant-check-model") << "Tested " << tests << " instantiations"; |
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if( bad>0 ){ |
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Trace("quant-check-model") << ", " << bad << " failed" << std::endl; |
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} |
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Trace("quant-check-model") << "." << std::endl; |
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}else{ |
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if( riter.isIncomplete() ){ |
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Trace("quant-check-model") << "Warning: Could not test quantifier " << f << std::endl; |
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} |
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} |
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} |
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} |
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} |
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FirstOrderModel* QModelBuilder::getModel() { return d_model; } |