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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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* Implementation of the trust node utility. |
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*/ |
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#include "proof/trust_node.h" |
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#include "proof/proof_ensure_closed.h" |
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#include "proof/proof_generator.h" |
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namespace cvc5 { |
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const char* toString(TrustNodeKind tnk) |
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{ |
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switch (tnk) |
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{ |
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case TrustNodeKind::CONFLICT: return "CONFLICT"; |
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case TrustNodeKind::LEMMA: return "LEMMA"; |
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case TrustNodeKind::PROP_EXP: return "PROP_EXP"; |
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case TrustNodeKind::REWRITE: return "REWRITE"; |
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default: return "?"; |
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} |
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} |
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std::ostream& operator<<(std::ostream& out, TrustNodeKind tnk) |
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{ |
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out << toString(tnk); |
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return out; |
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} |
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TrustNode TrustNode::mkTrustConflict(Node conf, ProofGenerator* g) |
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{ |
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Node ckey = getConflictProven(conf); |
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// if a generator is provided, should confirm that it can prove it |
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Assert(g == nullptr || g->hasProofFor(ckey)); |
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return TrustNode(TrustNodeKind::CONFLICT, ckey, g); |
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} |
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TrustNode TrustNode::mkTrustLemma(Node lem, ProofGenerator* g) |
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{ |
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Node lkey = getLemmaProven(lem); |
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// if a generator is provided, should confirm that it can prove it |
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Assert(g == nullptr || g->hasProofFor(lkey)); |
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return TrustNode(TrustNodeKind::LEMMA, lkey, g); |
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} |
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TrustNode TrustNode::mkTrustPropExp(TNode lit, Node exp, ProofGenerator* g) |
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{ |
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Node pekey = getPropExpProven(lit, exp); |
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Assert(g == nullptr || g->hasProofFor(pekey)); |
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return TrustNode(TrustNodeKind::PROP_EXP, pekey, g); |
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} |
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TrustNode TrustNode::mkTrustRewrite(TNode n, Node nr, ProofGenerator* g) |
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{ |
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Node rkey = getRewriteProven(n, nr); |
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Assert(g == nullptr || g->hasProofFor(rkey)); |
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return TrustNode(TrustNodeKind::REWRITE, rkey, g); |
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} |
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TrustNode TrustNode::null() |
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{ |
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return TrustNode(TrustNodeKind::INVALID, Node::null()); |
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} |
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TrustNode::TrustNode(TrustNodeKind tnk, Node p, ProofGenerator* g) |
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: d_tnk(tnk), d_proven(p), d_gen(g) |
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{ |
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// does not make sense to provide null node with generator |
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Assert(!d_proven.isNull() || d_gen == nullptr); |
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} |
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TrustNodeKind TrustNode::getKind() const { return d_tnk; } |
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Node TrustNode::getNode() const |
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{ |
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switch (d_tnk) |
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{ |
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// the node of lemma is the node itself |
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case TrustNodeKind::LEMMA: return d_proven; |
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// the node of the rewrite is the right hand side of EQUAL |
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case TrustNodeKind::REWRITE: return d_proven[1]; |
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// the node of an explained propagation is the antecendant of an IMPLIES |
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// the node of a conflict is underneath a NOT |
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default: return d_proven[0]; |
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} |
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} |
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Node TrustNode::getProven() const { return d_proven; } |
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ProofGenerator* TrustNode::getGenerator() const { return d_gen; } |
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bool TrustNode::isNull() const { return d_proven.isNull(); } |
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std::shared_ptr<ProofNode> TrustNode::toProofNode() const |
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{ |
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if (d_gen == nullptr) |
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{ |
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return nullptr; |
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} |
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return d_gen->getProofFor(d_proven); |
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} |
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Node TrustNode::getConflictProven(Node conf) { return conf.notNode(); } |
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Node TrustNode::getLemmaProven(Node lem) { return lem; } |
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Node TrustNode::getPropExpProven(TNode lit, Node exp) |
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{ |
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return NodeManager::currentNM()->mkNode(kind::IMPLIES, exp, lit); |
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} |
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Node TrustNode::getRewriteProven(TNode n, Node nr) { return n.eqNode(nr); } |
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void TrustNode::debugCheckClosed(const char* c, |
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const char* ctx, |
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bool reqNullGen) |
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{ |
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pfgEnsureClosed(d_proven, d_gen, c, ctx, reqNullGen); |
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} |
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std::string TrustNode::identifyGenerator() const |
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{ |
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if (d_gen == nullptr) |
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{ |
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return "null"; |
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} |
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return d_gen->identify(); |
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} |
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std::ostream& operator<<(std::ostream& out, TrustNode n) |
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{ |
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out << "(" << n.getKind() << " " << n.getProven() << " " |
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<< n.identifyGenerator() << ")"; |
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return out; |
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} |
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} // namespace cvc5 |