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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, 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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* A theory state for Theory. |
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*/ |
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#include "theory/theory_state.h" |
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#include "theory/uf/equality_engine.h" |
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namespace cvc5 { |
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namespace theory { |
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TheoryState::TheoryState(Env& env, Valuation val) |
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: EnvObj(env), d_valuation(val), d_ee(nullptr), d_conflict(context(), false) |
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{ |
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} |
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void TheoryState::setEqualityEngine(eq::EqualityEngine* ee) { d_ee = ee; } |
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bool TheoryState::hasTerm(TNode a) const |
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{ |
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Assert(d_ee != nullptr); |
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return d_ee->hasTerm(a); |
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} |
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TNode TheoryState::getRepresentative(TNode t) const |
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{ |
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Assert(d_ee != nullptr); |
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if (d_ee->hasTerm(t)) |
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{ |
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return d_ee->getRepresentative(t); |
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} |
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return t; |
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} |
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bool TheoryState::areEqual(TNode a, TNode b) const |
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{ |
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Assert(d_ee != nullptr); |
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if (a == b) |
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{ |
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return true; |
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} |
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else if (hasTerm(a) && hasTerm(b)) |
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{ |
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return d_ee->areEqual(a, b); |
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} |
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return false; |
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} |
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bool TheoryState::areDisequal(TNode a, TNode b) const |
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{ |
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Assert(d_ee != nullptr); |
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if (a == b) |
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{ |
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return false; |
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} |
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bool isConst = true; |
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bool hasTerms = true; |
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if (hasTerm(a)) |
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{ |
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a = d_ee->getRepresentative(a); |
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isConst = a.isConst(); |
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} |
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else if (!a.isConst()) |
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{ |
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// if not constant and not a term in the ee, it cannot be disequal |
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return false; |
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} |
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else |
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{ |
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hasTerms = false; |
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} |
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if (hasTerm(b)) |
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{ |
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b = d_ee->getRepresentative(b); |
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isConst = isConst && b.isConst(); |
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} |
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else if (!b.isConst()) |
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{ |
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// same as above, it cannot be disequal |
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return false; |
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} |
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else |
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{ |
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hasTerms = false; |
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} |
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if (isConst) |
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{ |
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// distinct constants are disequal |
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return a != b; |
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} |
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else if (!hasTerms) |
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{ |
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return false; |
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} |
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// otherwise there may be an explicit disequality in the equality engine |
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return d_ee->areDisequal(a, b, false); |
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} |
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void TheoryState::getEquivalenceClass(Node a, std::vector<Node>& eqc) const |
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{ |
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if (d_ee->hasTerm(a)) |
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{ |
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Node rep = d_ee->getRepresentative(a); |
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eq::EqClassIterator eqc_iter(rep, d_ee); |
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while (!eqc_iter.isFinished()) |
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{ |
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eqc.push_back(*eqc_iter); |
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eqc_iter++; |
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} |
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} |
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else |
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{ |
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eqc.push_back(a); |
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} |
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// a should be in its equivalence class |
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Assert(std::find(eqc.begin(), eqc.end(), a) != eqc.end()); |
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} |
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eq::EqualityEngine* TheoryState::getEqualityEngine() const { return d_ee; } |
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void TheoryState::notifyInConflict() { d_conflict = true; } |
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bool TheoryState::isInConflict() const { return d_conflict; } |
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bool TheoryState::isSatLiteral(TNode lit) const |
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{ |
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return d_valuation.isSatLiteral(lit); |
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} |
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TheoryModel* TheoryState::getModel() { return d_valuation.getModel(); } |
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SortInference* TheoryState::getSortInference() |
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{ |
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return d_valuation.getSortInference(); |
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} |
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bool TheoryState::hasSatValue(TNode n, bool& value) const |
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{ |
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return d_valuation.hasSatValue(n, value); |
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} |
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context::CDList<Assertion>::const_iterator TheoryState::factsBegin(TheoryId tid) |
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{ |
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return d_valuation.factsBegin(tid); |
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} |
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context::CDList<Assertion>::const_iterator TheoryState::factsEnd(TheoryId tid) |
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{ |
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return d_valuation.factsEnd(tid); |
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} |
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Valuation& TheoryState::getValuation() { return d_valuation; } |
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} // namespace theory |
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} // namespace cvc5 |