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/********************* */
/*! \file unconstrained_simplifier.h
** \verbatim
** Top contributors (to current version):
** Clark Barrett, Tim King
** This file is part of the CVC4 project.
** Copyright (c) 2009-2016 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 Simplifications based on unconstrained variables
**
** This module implements a preprocessing phase which replaces certain "unconstrained" expressions
** by variables. Based on Roberto Bruttomesso's PhD thesis.
**/
#include "cvc4_private.h"
#ifndef __CVC4__UNCONSTRAINED_SIMPLIFIER_H
#define __CVC4__UNCONSTRAINED_SIMPLIFIER_H
#include <vector>
#include <utility>
#include "expr/node.h"
#include "theory/substitutions.h"
#include "util/statistics_registry.h"
namespace CVC4 {
/* Forward Declarations */
class LogicInfo;
class UnconstrainedSimplifier {
/** number of expressions eliminated due to unconstrained simplification */
IntStat d_numUnconstrainedElim;
typedef std::hash_map<TNode, unsigned, TNodeHashFunction> TNodeCountMap;
typedef std::hash_map<TNode, TNode, TNodeHashFunction> TNodeMap;
typedef std::hash_set<TNode, TNodeHashFunction> TNodeSet;
TNodeCountMap d_visited;
TNodeMap d_visitedOnce;
TNodeSet d_unconstrained;
context::Context* d_context;
theory::SubstitutionMap d_substitutions;
const LogicInfo& d_logicInfo;
void visitAll(TNode assertion);
Node newUnconstrainedVar(TypeNode t, TNode var);
void processUnconstrained();
public:
UnconstrainedSimplifier(context::Context* context, const LogicInfo& logicInfo);
~UnconstrainedSimplifier();
void processAssertions(std::vector<Node>& assertions);
};
}
#endif
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