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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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* Pool-based instantiation strategy |
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*/ |
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#include "theory/quantifiers/inst_strategy_pool.h" |
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#include "options/quantifiers_options.h" |
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#include "theory/quantifiers/first_order_model.h" |
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#include "theory/quantifiers/instantiate.h" |
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#include "theory/quantifiers/quantifiers_inference_manager.h" |
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#include "theory/quantifiers/term_pools.h" |
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#include "theory/quantifiers/term_registry.h" |
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#include "theory/quantifiers/term_tuple_enumerator.h" |
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using namespace cvc5::kind; |
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using namespace cvc5::context; |
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namespace cvc5 { |
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namespace theory { |
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namespace quantifiers { |
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InstStrategyPool::InstStrategyPool(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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: QuantifiersModule(env, qs, qim, qr, tr) |
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{ |
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} |
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void InstStrategyPool::presolve() {} |
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bool InstStrategyPool::needsCheck(Theory::Effort e) |
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{ |
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return d_qstate.getInstWhenNeedsCheck(e); |
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} |
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void InstStrategyPool::reset_round(Theory::Effort e) {} |
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void InstStrategyPool::registerQuantifier(Node q) |
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{ |
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// take into account user pools |
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if (q.getNumChildren() == 3) |
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{ |
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Node subsPat = d_qreg.substituteBoundVariablesToInstConstants(q[2], q); |
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// add patterns |
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for (const Node& p : subsPat) |
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{ |
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if (p.getKind() == INST_POOL) |
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{ |
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d_userPools[q].push_back(p); |
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} |
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} |
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} |
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} |
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void InstStrategyPool::check(Theory::Effort e, QEffort quant_e) |
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{ |
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if (d_userPools.empty()) |
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{ |
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return; |
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} |
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double clSet = 0; |
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if (Trace.isOn("pool-engine")) |
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{ |
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clSet = double(clock()) / double(CLOCKS_PER_SEC); |
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Trace("pool-engine") << "---Pool instantiation, effort = " << e << "---" |
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<< std::endl; |
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} |
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FirstOrderModel* fm = d_treg.getModel(); |
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bool inConflict = false; |
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uint64_t addedLemmas = 0; |
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size_t nquant = fm->getNumAssertedQuantifiers(); |
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std::map<Node, std::vector<Node> >::iterator uit; |
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for (size_t i = 0; i < nquant; i++) |
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{ |
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Node q = fm->getAssertedQuantifier(i, true); |
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uit = d_userPools.find(q); |
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if (uit == d_userPools.end()) |
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{ |
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// no user pools for this |
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continue; |
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} |
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if (!d_qreg.hasOwnership(q, this) || !fm->isQuantifierActive(q)) |
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{ |
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// quantified formula is not owned by this or is inactive |
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continue; |
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} |
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// process with each user pool |
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for (const Node& p : uit->second) |
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{ |
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inConflict = process(q, p, addedLemmas); |
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if (inConflict) |
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{ |
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break; |
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} |
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} |
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if (inConflict) |
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{ |
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break; |
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} |
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} |
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if (Trace.isOn("pool-engine")) |
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{ |
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Trace("pool-engine") << "Added lemmas = " << addedLemmas << std::endl; |
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double clSet2 = double(clock()) / double(CLOCKS_PER_SEC); |
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Trace("pool-engine") << "Finished pool instantiation, time = " |
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<< (clSet2 - clSet) << std::endl; |
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} |
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} |
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std::string InstStrategyPool::identify() const |
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{ |
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return std::string("InstStrategyPool"); |
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} |
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bool InstStrategyPool::process(Node q, Node p, uint64_t& addedLemmas) |
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{ |
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TermTupleEnumeratorEnv ttec; |
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ttec.d_fullEffort = true; |
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ttec.d_increaseSum = options::fullSaturateSum(); |
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TermPools* tp = d_treg.getTermPools(); |
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std::shared_ptr<TermTupleEnumeratorInterface> enumerator( |
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mkTermTupleEnumeratorPool(q, &ttec, tp, p)); |
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Instantiate* ie = d_qim.getInstantiate(); |
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std::vector<Node> terms; |
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std::vector<bool> failMask; |
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// we instantiate exhaustively |
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enumerator->init(); |
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while (enumerator->hasNext()) |
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{ |
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if (d_qstate.isInConflict()) |
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{ |
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// could be conflicting for an internal reason |
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return true; |
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} |
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enumerator->next(terms); |
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// try instantiation |
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failMask.clear(); |
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if (ie->addInstantiationExpFail( |
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q, terms, failMask, InferenceId::QUANTIFIERS_INST_POOL)) |
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{ |
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Trace("pool-inst") << "Success with " << terms << std::endl; |
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addedLemmas++; |
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} |
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else |
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{ |
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Trace("pool-inst") << "Fail with " << terms << std::endl; |
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// notify the enumerator of the failure |
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enumerator->failureReason(failMask); |
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} |
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} |
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return false; |
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} |
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} // namespace quantifiers |
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} // namespace theory |
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} // namespace cvc5 |