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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds |
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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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* Utilities for term enumeration. |
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*/ |
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#include "theory/quantifiers/term_pools.h" |
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#include "theory/quantifiers/quantifiers_state.h" |
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namespace cvc5 { |
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namespace theory { |
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namespace quantifiers { |
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void TermPoolDomain::initialize() { d_terms.clear(); } |
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void TermPoolDomain::add(Node n) |
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{ |
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if (std::find(d_terms.begin(), d_terms.end(), n) == d_terms.end()) |
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{ |
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d_terms.push_back(n); |
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} |
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} |
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void TermPoolQuantInfo::initialize() |
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{ |
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d_instAddToPool.clear(); |
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d_skolemAddToPool.clear(); |
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} |
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TermPools::TermPools(QuantifiersState& qs) : d_qs(qs) {} |
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bool TermPools::reset(Theory::Effort e) |
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{ |
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for (std::pair<const Node, TermPoolDomain>& p : d_pools) |
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{ |
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p.second.d_currTerms.clear(); |
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} |
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return true; |
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} |
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void TermPools::registerQuantifier(Node q) |
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{ |
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if (q.getNumChildren() < 3) |
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{ |
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return; |
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} |
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TermPoolQuantInfo& qi = d_qinfo[q]; |
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qi.initialize(); |
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for (const Node& p : q[2]) |
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{ |
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Kind pk = p.getKind(); |
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if (pk == kind::INST_ADD_TO_POOL) |
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{ |
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qi.d_instAddToPool.push_back(p); |
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} |
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else if (pk == kind::SKOLEM_ADD_TO_POOL) |
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{ |
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qi.d_skolemAddToPool.push_back(p); |
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} |
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} |
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if (qi.d_instAddToPool.empty() && qi.d_skolemAddToPool.empty()) |
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{ |
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d_qinfo.erase(q); |
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} |
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} |
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std::string TermPools::identify() const { return "TermPools"; } |
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void TermPools::registerPool(Node p, const std::vector<Node>& initValue) |
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{ |
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TermPoolDomain& d = d_pools[p]; |
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d.initialize(); |
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for (const Node& i : initValue) |
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{ |
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Assert(i.getType().isComparableTo(p.getType().getSetElementType())); |
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d.add(i); |
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} |
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} |
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void TermPools::getTermsForPool(Node p, std::vector<Node>& terms) |
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{ |
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// for now, we assume p is a variable |
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Assert(p.isVar()); |
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TermPoolDomain& dom = d_pools[p]; |
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if (dom.d_terms.empty()) |
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{ |
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return; |
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} |
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// if we have yet to compute terms on this round |
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if (dom.d_currTerms.empty()) |
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{ |
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std::unordered_set<Node> reps; |
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// eliminate modulo equality |
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for (const Node& t : dom.d_terms) |
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{ |
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Node r = d_qs.getRepresentative(t); |
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if (reps.find(r) == reps.end()) |
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{ |
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reps.insert(r); |
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dom.d_currTerms.push_back(t); |
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} |
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} |
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Trace("pool-terms") << "* Domain for pool " << p << " is " |
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<< dom.d_currTerms << std::endl; |
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} |
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terms.insert(terms.end(), dom.d_currTerms.begin(), dom.d_currTerms.end()); |
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} |
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void TermPools::processInstantiation(Node q, const std::vector<Node>& terms) |
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{ |
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processInternal(q, terms, true); |
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} |
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void TermPools::processSkolemization(Node q, const std::vector<Node>& skolems) |
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{ |
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processInternal(q, skolems, false); |
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} |
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void TermPools::processInternal(Node q, |
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const std::vector<Node>& ts, |
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bool isInst) |
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{ |
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Assert(q.getKind() == kind::FORALL); |
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std::map<Node, TermPoolQuantInfo>::iterator it = d_qinfo.find(q); |
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if (it == d_qinfo.end()) |
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{ |
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// does not impact |
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return; |
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} |
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std::vector<Node> vars(q[0].begin(), q[0].end()); |
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Assert(vars.size() == ts.size()); |
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std::vector<Node>& cmds = |
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isInst ? it->second.d_instAddToPool : it->second.d_skolemAddToPool; |
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for (const Node& c : cmds) |
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{ |
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Assert(c.getNumChildren() == 2); |
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Node t = c[0]; |
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// substitute the term |
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Node st = t.substitute(vars.begin(), vars.end(), ts.begin(), ts.end()); |
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// add to pool |
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Trace("pool-terms") << "Due to " |
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<< (isInst ? "instantiation" : "skolemization") |
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<< ", add " << st << " to pool " << c[1] << std::endl; |
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TermPoolDomain& dom = d_pools[c[1]]; |
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dom.d_terms.push_back(st); |
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} |
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} |
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} // namespace quantifiers |
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} // namespace theory |
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} // namespace cvc5 |