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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) 2009-2018 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 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__PREPROCESSING_PASSES_UNCONSTRAINED_SIMPLIFIER_H
#define __CVC4__PREPROCESSING_PASSES_UNCONSTRAINED_SIMPLIFIER_H
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "context/context.h"
#include "expr/node.h"
#include "preprocessing/preprocessing_pass.h"
#include "preprocessing/preprocessing_pass_context.h"
#include "theory/logic_info.h"
#include "theory/substitutions.h"
#include "util/statistics_registry.h"
namespace CVC4 {
namespace preprocessing {
namespace passes {
class UnconstrainedSimplifier : public PreprocessingPass
{
public:
UnconstrainedSimplifier(PreprocessingPassContext* preprocContext);
~UnconstrainedSimplifier() override;
PreprocessingPassResult applyInternal(
AssertionPipeline* assertionsToPreprocess) override;
private:
/** number of expressions eliminated due to unconstrained simplification */
IntStat d_numUnconstrainedElim;
using TNodeCountMap = std::unordered_map<TNode, unsigned, TNodeHashFunction>;
using TNodeMap = std::unordered_map<TNode, TNode, TNodeHashFunction>;
using TNodeSet = std::unordered_set<TNode, TNodeHashFunction>;
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();
};
} // namespace passes
} // namespace preprocessing
} // namespace CVC4
#endif
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