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/********************* */
/*! \file arith_prop_manager.h
** \verbatim
** Original author: taking
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief [[ Add one-line brief description here ]]
**
** [[ Add lengthier description here ]]
** \todo document this file
**/
#include "cvc4_private.h"
#ifndef __CVC4__THEORY__ARITH__ARITH_PROP_MANAGER_H
#define __CVC4__THEORY__ARITH__ARITH_PROP_MANAGER_H
#include "theory/valuation.h"
#include "theory/arith/arith_utilities.h"
#include "theory/arith/arithvar_node_map.h"
#include "theory/arith/atom_database.h"
#include "theory/arith/delta_rational.h"
#include "context/context.h"
#include "context/cdlist.h"
#include "context/cdmap.h"
#include "context/cdo.h"
#include "util/stats.h"
namespace CVC4 {
namespace theory {
namespace arith {
class PropManager {
private:
context::CDList<TNode> d_propagated;
context::CDO<uint32_t> d_propagatedPos;
typedef context::CDMap<TNode, TNode, TNodeHashFunction> ExplainMap;
ExplainMap d_explanationMap;
context::CDList<Node> d_reasons;
public:
PropManager(context::Context* c):
d_propagated(c),
d_propagatedPos(c, 0),
d_explanationMap(c),
d_reasons(c)
{ }
bool isPropagated(TNode n) const {
return d_explanationMap.find(n) != d_explanationMap.end();
}
void propagate(TNode n, Node reason) {
Assert(!isPropagated(n));
Assert(reason.getKind() == kind::AND);
d_explanationMap.insert(n, reason);
d_reasons.push_back(reason);
d_propagated.push_back(n);
Debug("ArithPropManager") << n << std::endl << "<="<< reason<< std::endl;
}
bool hasMorePropagations() const {
return d_propagatedPos < d_propagated.size();
}
TNode getPropagation() {
Assert(hasMorePropagations());
TNode prop = d_propagated[d_propagatedPos];
d_propagatedPos = d_propagatedPos + 1;
return prop;
}
TNode explain(TNode n) const {
Assert(isPropagated(n));
ExplainMap::iterator p = d_explanationMap.find(n);
return (*p).second;
}
};/* class PropManager */
class ArithPropManager : public PropManager {
private:
const ArithVarNodeMap& d_arithvarNodeMap;
const ArithAtomDatabase& d_atomDatabase;
Valuation d_valuation;
public:
ArithPropManager(context::Context* c,
const ArithVarNodeMap& map,
const ArithAtomDatabase& db,
Valuation v):
PropManager(c), d_arithvarNodeMap(map), d_atomDatabase(db), d_valuation(v)
{}
/**
* Returns true if the node has a value in sat solver in the current context.
* In debug mode this fails an Assert() if the node has a negative assignment.
*/
bool isAsserted(TNode n) const;
/** Returns true if a bound was added. */
bool propagateArithVar(bool upperbound, ArithVar var, const DeltaRational& b, TNode reason);
Node boundAsNode(bool upperbound, ArithVar var, const DeltaRational& b) const;
Node strictlyWeakerLowerBound(TNode n) const{
return d_atomDatabase.getWeakerImpliedLowerBound(n);
}
Node strictlyWeakerUpperBound(TNode n) const{
return d_atomDatabase.getWeakerImpliedUpperBound(n);
}
Node strictlyWeakerAssertedUpperBound(ArithVar v, const DeltaRational& b) const;
Node strictlyWeakerAssertedLowerBound(ArithVar v, const DeltaRational& b) const;
Node getBestImpliedLowerBound(ArithVar v, const DeltaRational& b) const;
Node getBestImpliedUpperBound(ArithVar v, const DeltaRational& b) const;
bool containsLiteral(TNode n) const {
return d_atomDatabase.containsLiteral(n);
}
private:
class Statistics {
public:
IntStat d_propagateArithVarCalls;
IntStat d_addedPropagation;
IntStat d_alreadySetSatLiteral;
IntStat d_alreadyPropagatedNode;
Statistics();
~Statistics();
};
Statistics d_statistics;
};
}/* CVC4::theory::arith namespace */
}/* CVC4::theory namespace */
}/* CVC4 namespace */
#endif /* __CVC4__THEORY__ARITH__ARITH_PROP_MANAGER_H */
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