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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Mathias Preiner |
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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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* expr_miner |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__THEORY__QUANTIFIERS__EXPRESSION_MINER_H |
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#define CVC5__THEORY__QUANTIFIERS__EXPRESSION_MINER_H |
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#include <map> |
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#include <memory> |
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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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#include "theory/quantifiers/sygus_sampler.h" |
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#include "theory/smt_engine_subsolver.h" |
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namespace cvc5 { |
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class Env; |
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class SmtEngine; |
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namespace theory { |
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namespace quantifiers { |
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/** Expression miner |
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* |
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* This is a virtual base class for modules that "mines" certain information |
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* from (enumerated) expressions. This includes: |
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* - candidate rewrite rules (--sygus-rr-synth) |
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*/ |
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class ExprMiner : protected EnvObj |
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{ |
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public: |
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ExprMiner(Env& env) : EnvObj(env), d_sampler(nullptr) {} |
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virtual ~ExprMiner() {} |
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/** initialize |
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* |
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* This initializes this expression miner. The argument vars indicates the |
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* free variables of terms that will be added to this class. The argument |
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* sampler gives an (optional) pointer to a sampler, which is used to |
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* sample tuples of valuations of these variables. |
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*/ |
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virtual void initialize(const std::vector<Node>& vars, |
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SygusSampler* ss = nullptr); |
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/** add term |
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* |
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* This registers term n with this expression miner. The output stream out |
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* is provided as an argument for the purposes of outputting the result of |
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* the expression mining done by this class. For example, candidate-rewrite |
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* output is printed on out by the candidate rewrite generator miner. |
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*/ |
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virtual bool addTerm(Node n, std::ostream& out) = 0; |
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protected: |
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/** the set of variables used by this class */ |
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std::vector<Node> d_vars; |
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/** |
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* The set of skolems corresponding to the above variables. These are |
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* used during initializeChecker so that query (which may contain free |
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* variables) is converted to a formula without free variables. |
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*/ |
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std::vector<Node> d_skolems; |
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/** pointer to the sygus sampler object we are using */ |
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SygusSampler* d_sampler; |
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/** Maps to skolems for each free variable based on d_vars/d_skolems. */ |
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std::map<Node, Node> d_fv_to_skolem; |
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/** convert */ |
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Node convertToSkolem(Node n); |
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/** initialize checker |
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* |
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* This function initializes the smt engine smte to check the satisfiability |
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* of the argument "query", which is a formula whose free variables (of |
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* kind BOUND_VARIABLE) are a subset of d_vars. |
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*/ |
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void initializeChecker(std::unique_ptr<SmtEngine>& smte, Node query); |
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/** |
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* Run the satisfiability check on query and return the result |
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* (sat/unsat/unknown). |
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* |
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* In contrast to the above method, this call should be used for cases where |
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* the model for the query is not important. |
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*/ |
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Result doCheck(Node query); |
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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 /* CVC5__THEORY__QUANTIFIERS__EXPRESSION_MINER_H */ |