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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Gereon Kremer, 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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* Arrays inference manager. |
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*/ |
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#include "theory/arrays/inference_manager.h" |
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#include "options/smt_options.h" |
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#include "theory/theory.h" |
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#include "theory/theory_state.h" |
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#include "theory/uf/equality_engine.h" |
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using namespace cvc5::kind; |
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namespace cvc5 { |
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namespace theory { |
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namespace arrays { |
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InferenceManager::InferenceManager(Theory& t, |
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TheoryState& state, |
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ProofNodeManager* pnm) |
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: TheoryInferenceManager(t, state, pnm, "theory::arrays::", false), |
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d_lemmaPg(pnm ? new EagerProofGenerator( |
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pnm, state.getUserContext(), "ArrayLemmaProofGenerator") |
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: nullptr) |
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{ |
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} |
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bool InferenceManager::assertInference(TNode atom, |
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bool polarity, |
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InferenceId id, |
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TNode reason, |
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PfRule pfr) |
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{ |
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Trace("arrays-infer") << "TheoryArrays::assertInference: " |
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<< (polarity ? Node(atom) : atom.notNode()) << " by " |
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<< reason << "; " << id << std::endl; |
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Assert(atom.getKind() == EQUAL); |
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// if proofs are enabled, we determine which proof rule to add, otherwise |
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// we simply assert the internal fact |
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if (isProofEnabled()) |
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{ |
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Node fact = polarity ? Node(atom) : atom.notNode(); |
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std::vector<Node> children; |
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std::vector<Node> args; |
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// convert to proof rule application |
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convert(pfr, fact, reason, children, args); |
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return assertInternalFact(atom, polarity, id, pfr, children, args); |
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} |
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return assertInternalFact(atom, polarity, id, reason); |
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} |
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bool InferenceManager::arrayLemma( |
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Node conc, InferenceId id, Node exp, PfRule pfr, LemmaProperty p) |
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{ |
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Trace("arrays-infer") << "TheoryArrays::arrayLemma: " << conc << " by " << exp |
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<< "; " << id << std::endl; |
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NodeManager* nm = NodeManager::currentNM(); |
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if (isProofEnabled()) |
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{ |
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std::vector<Node> children; |
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std::vector<Node> args; |
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// convert to proof rule application |
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convert(pfr, conc, exp, children, args); |
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// make the trusted lemma based on the eager proof generator and send |
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TrustNode tlem = d_lemmaPg->mkTrustNode(conc, pfr, children, args); |
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return trustedLemma(tlem, id, p); |
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} |
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// send lemma without proofs |
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Node lem = nm->mkNode(IMPLIES, exp, conc); |
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return lemma(lem, id, p); |
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} |
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void InferenceManager::convert(PfRule& id, |
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Node conc, |
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Node exp, |
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std::vector<Node>& children, |
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std::vector<Node>& args) |
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{ |
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// note that children must contain something equivalent to exp, |
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// regardless of the PfRule. |
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switch (id) |
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{ |
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case PfRule::MACRO_SR_PRED_INTRO: |
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Assert(exp.isConst()); |
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args.push_back(conc); |
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break; |
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case PfRule::ARRAYS_READ_OVER_WRITE: |
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if (exp.isConst()) |
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{ |
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// Premise can be shown by rewriting, use standard predicate intro rule. |
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// This is the case where we have 2 constant indices. |
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id = PfRule::MACRO_SR_PRED_INTRO; |
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args.push_back(conc); |
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} |
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else |
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{ |
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children.push_back(exp); |
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args.push_back(conc[0]); |
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} |
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break; |
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case PfRule::ARRAYS_READ_OVER_WRITE_CONTRA: children.push_back(exp); break; |
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case PfRule::ARRAYS_READ_OVER_WRITE_1: |
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Assert(exp.isConst()); |
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args.push_back(conc[0]); |
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break; |
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case PfRule::ARRAYS_EXT: children.push_back(exp); break; |
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default: |
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if (id != PfRule::ARRAYS_TRUST) |
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{ |
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Assert(false) << "Unknown rule " << id << "\n"; |
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} |
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children.push_back(exp); |
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args.push_back(conc); |
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id = PfRule::ARRAYS_TRUST; |
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break; |
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} |
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} |
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} // namespace arrays |
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} // namespace theory |
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} // namespace cvc5 |