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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Mudathir Mohamed |
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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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* Sets state object. |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__THEORY__SETS__TERM_REGISTRY_H |
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#define CVC5__THEORY__SETS__TERM_REGISTRY_H |
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#include <map> |
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#include <vector> |
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#include "context/cdhashmap.h" |
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#include "theory/eager_proof_generator.h" |
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#include "theory/sets/inference_manager.h" |
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#include "theory/sets/skolem_cache.h" |
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#include "theory/sets/solver_state.h" |
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namespace cvc5 { |
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namespace theory { |
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namespace sets { |
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/** |
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* Term registry, the purpose of this class is to maintain a database of |
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* commonly used terms, and mappings from sets to their "proxy variables". |
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*/ |
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class TermRegistry |
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{ |
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typedef context::CDHashMap<Node, Node> NodeMap; |
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public: |
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TermRegistry(SolverState& state, |
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InferenceManager& im, |
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SkolemCache& skc, |
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ProofNodeManager* pnm); |
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/** Get type constraint skolem |
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* |
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* The sets theory solver outputs equality lemmas of the form: |
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* n = d_tc_skolem[n][tn] |
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* where the type of d_tc_skolem[n][tn] is tn, and the type |
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* of n is not a subtype of tn. This is required to handle benchmarks like |
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* test/regress/regress0/sets/sets-of-sets-subtypes.smt2 |
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* where for s : (Set Int) and t : (Set Real), we have that |
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* ( s = t ^ y in t ) implies ( exists k : Int. y = k ) |
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* The type constraint Skolem for (y, Int) is the skolemization of k above. |
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*/ |
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Node getTypeConstraintSkolem(Node n, TypeNode tn); |
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/** get the proxy variable for set n |
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* |
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* Proxy variables are used to communicate information that otherwise would |
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* not be possible due to rewriting. For example, the literal |
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* card( singleton( 0 ) ) = 1 |
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* is rewritten to true. Instead, to communicate this fact (e.g. to other |
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* theories), we require introducing a proxy variable x for singleton( 0 ). |
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* Then: |
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* card( x ) = 1 ^ x = singleton( 0 ) |
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* communicates the equivalent of the above literal. |
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*/ |
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Node getProxy(Node n); |
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/** Get the empty set of type tn */ |
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Node getEmptySet(TypeNode tn); |
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/** Get the universe set of type tn if it exists or create a new one */ |
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Node getUnivSet(TypeNode tn); |
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/** debug print set */ |
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void debugPrintSet(Node s, const char* c) const; |
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private: |
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/** Send simple lemma internal */ |
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void sendSimpleLemmaInternal(Node n, InferenceId id); |
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/** The inference manager */ |
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InferenceManager& d_im; |
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/** Reference to the skolem cache */ |
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SkolemCache& d_skCache; |
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/** Map from set terms to their proxy variables */ |
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NodeMap d_proxy; |
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/** Backwards map of above */ |
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NodeMap d_proxy_to_term; |
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/** Cache of type constraint skolems (see getTypeConstraintSkolem) */ |
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std::map<Node, std::map<TypeNode, Node> > d_tc_skolem; |
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/** Map from types to empty set of that type */ |
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std::map<TypeNode, Node> d_emptyset; |
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/** Map from types to universe set of that type */ |
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std::map<TypeNode, Node> d_univset; |
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/** Eager proof generator for purification lemmas */ |
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std::unique_ptr<EagerProofGenerator> d_epg; |
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}; /* class TheorySetsPrivate */ |
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} // namespace sets |
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} // namespace theory |
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} // namespace cvc5 |
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#endif /* CVC5__THEORY__SETS__TERM_REGISTRY_H */ |