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/******************************************************************************
* Top contributors (to current version):
* Liana Hadarean, Yoni Zohar, Mathias Preiner
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 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.
* ****************************************************************************
*
* Preprocessing pass that lifts bit-vectors of size 1 to booleans.
*/
#include "cvc4_private.h"
#ifndef CVC5__PREPROCESSING__PASSES__BV_TO_BOOL_H
#define CVC5__PREPROCESSING__PASSES__BV_TO_BOOL_H
#include "expr/node.h"
#include "preprocessing/preprocessing_pass.h"
#include "util/statistics_registry.h"
namespace cvc5 {
namespace preprocessing {
namespace passes {
typedef std::unordered_map<Node, Node, NodeHashFunction> NodeNodeMap;
class BVToBool : public PreprocessingPass
{
public:
BVToBool(PreprocessingPassContext* preprocContext);
protected:
PreprocessingPassResult applyInternal(
AssertionPipeline* assertionsToPreprocess) override;
private:
struct Statistics
{
IntStat d_numTermsLifted;
IntStat d_numAtomsLifted;
IntStat d_numTermsForcedLifted;
Statistics();
~Statistics();
};
void addToBoolCache(TNode term, Node new_term);
Node getBoolCache(TNode term) const;
bool hasBoolCache(TNode term) const;
void addToLiftCache(TNode term, Node new_term);
Node getLiftCache(TNode term) const;
bool hasLiftCache(TNode term) const;
bool isConvertibleBvTerm(TNode node);
bool isConvertibleBvAtom(TNode node);
Node convertBvAtom(TNode node);
Node convertBvTerm(TNode node);
Node liftNode(TNode current);
void liftBvToBool(const std::vector<Node>& assertions,
std::vector<Node>& new_assertions);
NodeNodeMap d_liftCache;
NodeNodeMap d_boolCache;
Node d_one;
Node d_zero;
Statistics d_statistics;
};
} // namespace passes
} // namespace preprocessing
} // namespace cvc5
#endif /* CVC5__PREPROCESSING__PASSES__BV_TO_BOOL_H */
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