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/********************* */
/*! \file arith_ite_utils.h
** \verbatim
** Top contributors (to current version):
** Tim King
** This file is part of the CVC4 project.
** Copyright (c) 2009-2018 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 [[ Add one-line brief description here ]]
**
** [[ Add lengthier description here ]]
** \todo document this file
**/
// Pass 1: label the ite as (constant) or (+ constant variable)
#include "cvc4_private.h"
#ifndef __CVC4__THEORY__ARITH__ARITH_ITE_UTILS_H
#define __CVC4__THEORY__ARITH__ARITH_ITE_UTILS_H
#include <unordered_map>
#include "expr/node.h"
#include "context/cdo.h"
#include "context/cdtrail_hashmap.h"
namespace CVC4 {
namespace theory {
class ContainsTermITEVisitor;
class SubstitutionMap;
class TheoryModel;
namespace arith {
class ArithIteUtils {
ContainsTermITEVisitor& d_contains;
SubstitutionMap* d_subs;
TheoryModel* d_model;
typedef std::unordered_map<Node, Node, NodeHashFunction> NodeMap;
// cache for reduce vars
NodeMap d_reduceVar; // if reduceVars[n].isNull(), treat reduceVars[n] == n
// reduceVars[n] = d_constants[n] + d_varParts[n]
NodeMap d_constants; // d_constants[n] is a constant ite tree
NodeMap d_varParts; // d_varParts[n] is a polynomial
NodeMap d_reduceGcd;
typedef std::unordered_map<Node, Integer, NodeHashFunction> NodeIntegerMap;
NodeIntegerMap d_gcds;
Integer d_one;
context::CDO<unsigned> d_subcount;
typedef context::CDTrailHashMap<Node, Node, NodeHashFunction> CDNodeMap;
CDNodeMap d_skolems;
typedef std::map<Node, std::set<Node> > ImpMap;
ImpMap d_implies;
std::vector<Node> d_skolemsAdded;
std::vector<Node> d_orBinEqs;
public:
ArithIteUtils(ContainsTermITEVisitor& contains,
context::Context* userContext,
TheoryModel* model);
~ArithIteUtils();
//(ite ?v_2 ?v_1 (ite ?v_3 (- ?v_1 128) (- ?v_1 256)))
/** removes common sums variables sums from term ites. */
Node reduceVariablesInItes(Node n);
Node reduceConstantIteByGCD(Node n);
void clear();
Node applySubstitutions(TNode f);
unsigned getSubCount() const;
void learnSubstitutions(const std::vector<Node>& assertions);
private:
/* applies this to all children of n and constructs the result */
Node applyReduceVariablesInItes(Node n);
const Integer& gcdIte(Node n);
Node reduceIteConstantIteByGCD_rec(Node n, const Rational& q);
Node reduceIteConstantIteByGCD(Node n);
void addSubstitution(TNode f, TNode t);
Node selectForCmp(Node n) const;
void collectAssertions(TNode assertion);
void addImplications(Node x, Node y);
Node findIteCnd(TNode tb, TNode fb) const;
bool solveBinOr(TNode binor);
}; /* class ArithIteUtils */
}/* CVC4::theory::arith namespace */
}/* CVC4::theory namespace */
}/* CVC4 namespace */
#endif /* __CVC4__THEORY__ARITH__ARITH_ITE_UTILS_H */
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