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/********************* */
/*! \file proof_node_manager.cpp
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Implementation of proof node manager
**/
#include "expr/proof_node_manager.h"
using namespace CVC4::kind;
namespace CVC4 {
ProofNodeManager::ProofNodeManager(ProofChecker* pc) : d_checker(pc) {}
std::shared_ptr<ProofNode> ProofNodeManager::mkNode(
PfRule id,
const std::vector<std::shared_ptr<ProofNode>>& children,
const std::vector<Node>& args,
Node expected)
{
Node res = checkInternal(id, children, args, expected);
if (res.isNull())
{
// if it was invalid, then we return the null node
return nullptr;
}
// otherwise construct the proof node and set its proven field
std::shared_ptr<ProofNode> pn =
std::make_shared<ProofNode>(id, children, args);
pn->d_proven = res;
return pn;
}
bool ProofNodeManager::updateNode(
ProofNode* pn,
PfRule id,
const std::vector<std::shared_ptr<ProofNode>>& children,
const std::vector<Node>& args)
{
// should have already computed what is proven
Assert(!pn->d_proven.isNull())
<< "ProofNodeManager::updateProofNode: invalid proof provided";
// We expect to prove the same thing as before
Node res = checkInternal(id, children, args, pn->d_proven);
if (res.isNull())
{
// if it was invalid, then we do not update
return false;
}
// we update its value
pn->setValue(id, children, args);
// proven field should already be the same as the result
Assert(res == pn->d_proven);
return true;
}
Node ProofNodeManager::checkInternal(
PfRule id,
const std::vector<std::shared_ptr<ProofNode>>& children,
const std::vector<Node>& args,
Node expected)
{
Node res;
if (d_checker)
{
// check with the checker, which takes expected as argument
res = d_checker->check(id, children, args, expected);
Assert(!res.isNull())
<< "ProofNodeManager::checkInternal: failed to check proof";
}
else
{
// otherwise we trust the expected value, if it exists
Assert(!expected.isNull()) << "ProofNodeManager::checkInternal: no checker "
"or expected value provided";
res = expected;
}
return res;
}
} // namespace CVC4
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