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/********************* */
/*! \file bv_to_bool.h
** \verbatim
** Original author: Liana Hadarean
** Major contributors: None.
** Minor contributors (to current version): None.
** This file is part of the CVC4 project.
** Copyright (c) 2009-2013 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Preprocessing pass that lifts bit-vectors of size 1 to booleans.
**
** Preprocessing pass that lifts bit-vectors of size 1 to booleans.
**/
#include "cvc4_private.h"
#include "theory/bv/theory_bv_utils.h"
#ifndef __CVC4__THEORY__BV__BV_TO_BOOL_H
#define __CVC4__THEORY__BV__BV_TO_BOOL_H
namespace CVC4 {
namespace theory {
namespace bv {
class BvToBoolVisitor {
typedef __gnu_cxx::hash_set<TNode, TNodeHashFunction> TNodeSet;
typedef __gnu_cxx::hash_map<TNode, Node, TNodeHashFunction> TNodeNodeMap;
TNodeNodeMap d_cache;
TNodeNodeMap d_bvToBoolTerm;
TNodeSet d_visited;
Node d_one;
Node d_zero;
void storeBvToBool(TNode bv_term, Node bool_term);
Node getBoolTerm(TNode bv_term) const;
bool hasBoolTerm(TNode bv_term) const;
void addToCache(TNode term, Node new_term);
Node getCache(TNode term) const;
bool hasCache(TNode term) const;
bool isConvertibleToBool(TNode current);
Node convertToBool(TNode current);
public:
typedef Node return_type;
BvToBoolVisitor()
: d_cache(),
d_bvToBoolTerm(),
d_visited(),
d_one(utils::mkConst(BitVector(1, 1u))),
d_zero(utils::mkConst(BitVector(1, 0u)))
{}
void start(TNode node);
bool alreadyVisited(TNode current, TNode parent);
void visit(TNode current, TNode parent);
return_type done(TNode node);
};
class BvToBoolPreprocessor {
BvToBoolVisitor d_visitor;
public:
BvToBoolPreprocessor()
: d_visitor()
{}
~BvToBoolPreprocessor() {}
Node liftBoolToBV(TNode assertion);
};
}/* CVC4::theory::bv namespace */
}/* CVC4::theory namespace */
}/* CVC4 namespace */
#endif /* __CVC4__THEORY__BV__BV_TO_BOOL_H */
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