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/********************* */
/*! \file global_negate.h
** \verbatim
** Top contributors (to current version):
** Yoni Zohar, Mathias Preiner, Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 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 the global_negate preprocessing pass
* Updates a set of assertions to the negation of
* these assertions. In detail, if assertions is:
* F1, ..., Fn
* then we update this vector to:
* forall x1...xm. ~( F1 ^ ... ^ Fn ), true, ..., true
* where x1...xm are the free variables of F1...Fn.
* When this is done, d_globalNegation flag is marked, so that the solver checks
*for unsat instead of sat.
**/
#include "cvc4_private.h"
#ifndef CVC4__PREPROCESSING__PASSES__GLOBAL_NEGATE_H
#define CVC4__PREPROCESSING__PASSES__GLOBAL_NEGATE_H
#include "expr/node.h"
#include "preprocessing/preprocessing_pass.h"
namespace CVC4 {
namespace preprocessing {
namespace passes {
class GlobalNegate : public PreprocessingPass
{
public:
GlobalNegate(PreprocessingPassContext* preprocContext);
protected:
PreprocessingPassResult applyInternal(
AssertionPipeline* assertionsToPreprocess) override;
private:
Node simplify(const std::vector<Node>& assertions, NodeManager* nm);
};
} // namespace passes
} // namespace preprocessing
} // namespace CVC4
#endif /* CVC4__PREPROCESSING_PASSES__GLOBAL_NEGATE_H */
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