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/****************************************************************************** |
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* Top contributors (to current version): |
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* Yoni Zohar, Gereon Kremer |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* The foreign_theory_rewrite preprocessing pass. |
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* |
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* Simplifies nodes of one theory using rewrites from another. |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__PREPROCESSING__PASSES__FOREIGN_THEORY_REWRITE_H |
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#define CVC5__PREPROCESSING__PASSES__FOREIGN_THEORY_REWRITE_H |
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#include "context/cdhashmap.h" |
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#include "expr/node.h" |
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#include "preprocessing/preprocessing_pass.h" |
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namespace cvc5 { |
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namespace preprocessing { |
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namespace passes { |
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using CDNodeMap = context::CDHashMap<Node, Node>; |
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class ForeignTheoryRewrite : public PreprocessingPass |
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{ |
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public: |
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ForeignTheoryRewrite(PreprocessingPassContext* preprocContext); |
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protected: |
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PreprocessingPassResult applyInternal( |
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AssertionPipeline* assertionsToPreprocess) override; |
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/** the main function that simplifies n. |
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* does a traversal on n and call rewriting fucntions. |
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*/ |
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Node simplify(Node n); |
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/** A specific simplification function specific for GEQ |
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* constraints in strings. |
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*/ |
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static Node rewriteStringsGeq(Node n); |
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/** invoke rewrite functions for n. |
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* based on the structure of n (typically its kind) |
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* we invoke rewrites from other theories. |
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* For example: when encountering a `>=` node, |
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* we invoke rewrites from the theory of strings. |
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*/ |
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static Node foreignRewrite(Node n); |
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/** construct a node with the same operator as originalNode whose children are |
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* processedChildren |
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*/ |
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static Node reconstructNode(Node originalNode, std::vector<Node> newChildren); |
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/** A cache to store the simplified nodes */ |
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CDNodeMap d_cache; |
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}; |
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} // namespace passes |
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} // namespace preprocessing |
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} // namespace cvc5 |
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#endif /* CVC5__PREPROCESSING__PASSES__FOREIGN_THEORY_REWRITE_H */ |