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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds |
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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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* Techniques for evaluating terms with recursively defined functions. |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__QUANTIFIERS_FUN_DEF_EVALUATOR_H |
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#define CVC5__QUANTIFIERS_FUN_DEF_EVALUATOR_H |
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#include <map> |
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#include <vector> |
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#include "expr/node.h" |
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#include "smt/env_obj.h" |
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namespace cvc5 { |
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namespace theory { |
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namespace quantifiers { |
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/** |
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* Techniques for evaluating recursively defined functions. |
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*/ |
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class FunDefEvaluator : protected EnvObj |
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{ |
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public: |
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FunDefEvaluator(Env& env); |
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~FunDefEvaluator() {} |
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/** |
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* Assert definition of a (recursive) function definition given by quantified |
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* formula q. |
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*/ |
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void assertDefinition(Node q); |
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/** |
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* Simplify node based on the (recursive) function definitions known by this |
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* class. If n cannot be simplified to a constant, then this method returns |
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* null. |
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*/ |
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Node evaluateDefinitions(Node n) const; |
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/** |
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* Has a call to assertDefinition been made? If this returns false, then |
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* the evaluate method is the same as calling the rewriter, and returning |
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* false if the result is non-constant. |
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*/ |
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bool hasDefinitions() const; |
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/** Get definitions */ |
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const std::vector<Node>& getDefinitions() const; |
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/** Get definition for function symbol f, if it is cached by this class */ |
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Node getDefinitionFor(Node f) const; |
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private: |
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/** information cached per function definition */ |
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class FunDefInfo |
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{ |
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public: |
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/** the quantified formula */ |
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Node d_quant; |
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/** the body */ |
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Node d_body; |
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/** the formal argument list */ |
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std::vector<Node> d_args; |
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}; |
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/** maps functions to the above information */ |
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std::map<Node, FunDefInfo> d_funDefMap; |
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/** list of all definitions */ |
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std::vector<Node> d_funDefs; |
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}; |
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} // namespace quantifiers |
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} // namespace theory |
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} // namespace cvc5 |
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#endif |