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/********************* */
/*! \file apply_to_const.cpp
** \verbatim
** Top contributors (to current version):
** Haniel Barbosa, Morgan Deters
** 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 The ApplyToConst preprocessing pass
**
** Rewrites applies to constants
**/
#include "preprocessing/passes/apply_to_const.h"
#include "theory/rewriter.h"
namespace CVC4 {
namespace preprocessing {
namespace passes {
using namespace CVC4::theory;
ApplyToConst::ApplyToConst(PreprocessingPassContext* preprocContext)
: PreprocessingPass(preprocContext, "apply-to-const"){};
Node ApplyToConst::rewriteApplyToConst(TNode n, NodeMap& cache)
{
Trace("rewriteApplyToConst") << "rewriteApplyToConst :: " << n << std::endl;
if (n.getMetaKind() == kind::metakind::CONSTANT
|| n.getMetaKind() == kind::metakind::VARIABLE
|| n.getMetaKind() == kind::metakind::NULLARY_OPERATOR)
{
return n;
}
if (cache.find(n) != cache.end())
{
Trace("rewriteApplyToConst") << "in cache :: " << cache[n] << std::endl;
return cache[n];
}
if (n.getKind() == kind::APPLY_UF)
{
if (n.getNumChildren() == 1 && n[0].isConst() && n[0].getType().isInteger())
{
stringstream ss;
ss << n.getOperator() << "_";
if (n[0].getConst<Rational>() < 0)
{
ss << "m" << -n[0].getConst<Rational>();
}
else
{
ss << n[0];
}
Node newvar =
NodeManager::currentNM()->mkSkolem(ss.str(),
n.getType(),
"rewriteApplyToConst skolem",
NodeManager::SKOLEM_EXACT_NAME);
cache[n] = newvar;
Trace("rewriteApplyToConst") << "made :: " << newvar << std::endl;
return newvar;
}
stringstream ss;
ss << "The rewrite-apply-to-const preprocessor is currently limited;\n"
<< "it only works if all function symbols are unary and with Integer\n"
<< "domain, and all applications are to integer values.\n"
<< "Found application: " << n;
Unhandled(ss.str());
}
NodeBuilder<> builder(n.getKind());
if (n.getMetaKind() == kind::metakind::PARAMETERIZED)
{
builder << n.getOperator();
}
for (unsigned i = 0; i < n.getNumChildren(); ++i)
{
builder << rewriteApplyToConst(n[i], cache);
}
Node rewr = builder;
cache[n] = rewr;
Trace("rewriteApplyToConst") << "built :: " << rewr << std::endl;
return rewr;
}
PreprocessingPassResult ApplyToConst::applyInternal(
AssertionPipeline* assertionsToPreprocess)
{
NodeMap cache;
for (unsigned i = 0, size = assertionsToPreprocess->size(); i < size; ++i)
{
assertionsToPreprocess->replace(i,
Rewriter::rewrite(rewriteApplyToConst(
(*assertionsToPreprocess)[i], cache)));
}
return PreprocessingPassResult::NO_CONFLICT;
}
} // namespace passes
} // namespace preprocessing
} // namespace CVC4
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