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/********************* */
/*! \file arith_preprocess.cpp
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 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 Arithmetic preprocess
**/
#include "theory/arith/arith_preprocess.h"
#include "theory/arith/inference_manager.h"
namespace CVC4 {
namespace theory {
namespace arith {
ArithPreprocess::ArithPreprocess(ArithState& state,
InferenceManager& im,
ProofNodeManager* pnm,
const LogicInfo& info)
: d_im(im), d_opElim(pnm, info), d_reduced(state.getUserContext())
{
}
TrustNode ArithPreprocess::eliminate(TNode n, bool partialOnly)
{
return d_opElim.eliminate(n, partialOnly);
}
bool ArithPreprocess::reduceAssertion(TNode atom)
{
context::CDHashMap<Node, bool, NodeHashFunction>::const_iterator it =
d_reduced.find(atom);
if (it != d_reduced.end())
{
// already computed
return (*it).second;
}
TrustNode tn = eliminate(atom);
if (tn.isNull())
{
// did not reduce
d_reduced[atom] = false;
return false;
}
Assert(tn.getKind() == TrustNodeKind::REWRITE);
// tn is of kind REWRITE, turn this into a LEMMA here
TrustNode tlem = TrustNode::mkTrustLemma(tn.getProven(), tn.getGenerator());
// send the trusted lemma
d_im.trustedLemma(tlem, InferenceId::ARITH_PP_ELIM_OPERATORS);
// mark the atom as reduced
d_reduced[atom] = true;
return true;
}
bool ArithPreprocess::isReduced(TNode atom) const
{
context::CDHashMap<Node, bool, NodeHashFunction>::const_iterator it =
d_reduced.find(atom);
if (it == d_reduced.end())
{
return false;
}
return (*it).second;
}
} // namespace arith
} // namespace theory
} // namespace CVC4
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