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/********************* */
/*! \file quant_util.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds, Mathias Preiner
** This file is part of the CVC4 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.\endverbatim
**
** \brief quantifier util
**/
#include "cvc4_private.h"
#ifndef CVC4__THEORY__QUANT_UTIL_H
#define CVC4__THEORY__QUANT_UTIL_H
#include <iostream>
#include <map>
#include <vector>
#include "expr/node.h"
#include "theory/theory.h"
namespace CVC4 {
namespace theory {
/** Quantifiers utility
*
* This is a lightweight version of a quantifiers module that does not implement
* methods for checking satisfiability.
*/
class QuantifiersUtil {
public:
QuantifiersUtil(){}
virtual ~QuantifiersUtil(){}
/* reset
* Called at the beginning of an instantiation round
* Returns false if the reset failed. When reset fails, the utility should
* have added a lemma via a call to d_qim.addPendingLemma.
*/
virtual bool reset( Theory::Effort e ) = 0;
/* Called for new quantifiers */
virtual void registerQuantifier(Node q) = 0;
/** Identify this module (for debugging, dynamic configuration, etc..) */
virtual std::string identify() const = 0;
/** Check complete?
*
* Returns false if the utility's reasoning was globally incomplete
* (e.g. "sat" must be replaced with "incomplete").
*/
virtual bool checkComplete() { return true; }
};
class QuantPhaseReq
{
private:
/** helper functions compute phase requirements */
void computePhaseReqs( Node n, bool polarity, std::map< Node, int >& phaseReqs );
public:
QuantPhaseReq(){}
QuantPhaseReq( Node n, bool computeEq = false );
~QuantPhaseReq(){}
void initialize( Node n, bool computeEq );
/** is phase required */
bool isPhaseReq( Node lit ) { return d_phase_reqs.find( lit )!=d_phase_reqs.end(); }
/** get phase requirement */
bool getPhaseReq( Node lit ) { return d_phase_reqs.find( lit )==d_phase_reqs.end() ? false : d_phase_reqs[ lit ]; }
/** phase requirements for each quantifier for each instantiation literal */
std::map< Node, bool > d_phase_reqs;
std::map< Node, bool > d_phase_reqs_equality;
std::map< Node, Node > d_phase_reqs_equality_term;
static void getPolarity( Node n, int child, bool hasPol, bool pol, bool& newHasPol, bool& newPol );
static void getEntailPolarity( Node n, int child, bool hasPol, bool pol, bool& newHasPol, bool& newPol );
};
}
}
#endif /* CVC4__THEORY__QUANT_UTIL_H */
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