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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Mathias Preiner, Aina Niemetz |
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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 utility for building model cores. |
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*/ |
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#include "smt/model_core_builder.h" |
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#include "theory/subs_minimize.h" |
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using namespace cvc5::kind; |
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namespace cvc5 { |
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ModelCoreBuilder::ModelCoreBuilder(Env& env) : EnvObj(env) {} |
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bool ModelCoreBuilder::setModelCore(const std::vector<Node>& assertions, |
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theory::TheoryModel* m, |
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options::ModelCoresMode mode) |
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{ |
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if (m->isUsingModelCore()) |
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{ |
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// already computed |
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return true; |
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} |
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if (Trace.isOn("model-core")) |
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{ |
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Trace("model-core") << "Compute model core, assertions:" << std::endl; |
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for (const Node& a : assertions) |
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{ |
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Trace("model-core") << " " << a << std::endl; |
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} |
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} |
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// convert to nodes |
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NodeManager* nm = NodeManager::currentNM(); |
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Node formula = nm->mkAnd(assertions); |
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std::vector<Node> vars; |
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std::vector<Node> subs; |
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Trace("model-core") << "Assignments: " << std::endl; |
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std::unordered_set<TNode> visited; |
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std::vector<TNode> visit; |
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TNode cur; |
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visit.push_back(formula); |
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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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if (visited.find(cur) == visited.end()) |
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{ |
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visited.insert(cur); |
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if (cur.isVar()) |
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{ |
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Node vcur = m->getValue(cur); |
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Trace("model-core") << " " << cur << " -> " << vcur << std::endl; |
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vars.push_back(cur); |
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subs.push_back(vcur); |
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} |
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if (cur.getMetaKind() == metakind::PARAMETERIZED) |
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{ |
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visit.push_back(cur.getOperator()); |
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} |
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visit.insert(visit.end(), cur.begin(), cur.end()); |
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} |
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} while (!visit.empty()); |
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Node truen = nm->mkConst(true); |
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Trace("model-core") << "Minimizing substitution..." << std::endl; |
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std::vector<Node> coreVars; |
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std::vector<Node> impliedVars; |
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bool minimized = false; |
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theory::SubstitutionMinimize sm(d_env); |
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if (mode == options::ModelCoresMode::NON_IMPLIED) |
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{ |
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minimized = sm.findWithImplied(formula, vars, subs, coreVars, impliedVars); |
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} |
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else if (mode == options::ModelCoresMode::SIMPLE) |
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{ |
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minimized = sm.find(formula, truen, vars, subs, coreVars); |
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} |
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else |
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{ |
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Unreachable() << "Unknown model cores mode"; |
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} |
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Assert(minimized) |
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<< "cannot compute model core, since model does not satisfy input!"; |
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if (minimized) |
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{ |
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m->setUsingModelCore(); |
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Trace("model-core") << "...got core vars : " << coreVars << std::endl; |
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for (const Node& cv : coreVars) |
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{ |
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m->recordModelCoreSymbol(cv); |
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} |
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return true; |
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} |
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Trace("model-core") << "...failed, model does not satisfy input!" |
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<< std::endl; |
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return false; |
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} |
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} // namespace cvc5 |