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       1                 :            : /******************************************************************************
       2                 :            :  * Top contributors (to current version):
       3                 :            :  *   Andrew Reynolds, Aina Niemetz
       4                 :            :  *
       5                 :            :  * This file is part of the cvc5 project.
       6                 :            :  *
       7                 :            :  * Copyright (c) 2009-2024 by the authors listed in the file AUTHORS
       8                 :            :  * in the top-level source directory and their institutional affiliations.
       9                 :            :  * All rights reserved.  See the file COPYING in the top-level source
      10                 :            :  * directory for licensing information.
      11                 :            :  * ****************************************************************************
      12                 :            :  *
      13                 :            :  * Utilities for management of equality engines.
      14                 :            :  */
      15                 :            : 
      16                 :            : #include "cvc5_private.h"
      17                 :            : 
      18                 :            : #ifndef CVC5__THEORY__EE_MANAGER__H
      19                 :            : #define CVC5__THEORY__EE_MANAGER__H
      20                 :            : 
      21                 :            : #include <map>
      22                 :            : #include <memory>
      23                 :            : 
      24                 :            : #include "smt/env_obj.h"
      25                 :            : #include "theory/ee_setup_info.h"
      26                 :            : #include "theory/theory.h"
      27                 :            : #include "theory/uf/equality_engine.h"
      28                 :            : 
      29                 :            : namespace cvc5::internal {
      30                 :            : 
      31                 :            : class TheoryEngine;
      32                 :            : 
      33                 :            : namespace theory {
      34                 :            : 
      35                 :            : class SharedSolver;
      36                 :            : 
      37                 :            : /**
      38                 :            :  * This is (theory-agnostic) information associated with the management of
      39                 :            :  * an equality engine for a single theory. This information is maintained
      40                 :            :  * by the manager class below.
      41                 :            :  *
      42                 :            :  * Currently, this simply is the equality engine itself, for memory
      43                 :            :  * management purposes.
      44                 :            :  */
      45                 :            : struct EeTheoryInfo
      46                 :            : {
      47                 :     689962 :   EeTheoryInfo() : d_usedEe(nullptr) {}
      48                 :            :   /** Equality engine that is used (if it exists) */
      49                 :            :   eq::EqualityEngine* d_usedEe;
      50                 :            :   /** Equality engine allocated specifically for this theory (if it exists) */
      51                 :            :   std::unique_ptr<eq::EqualityEngine> d_allocEe;
      52                 :            : };
      53                 :            : 
      54                 :            : /** Virtual base class for equality engine managers */
      55                 :            : class EqEngineManager : protected EnvObj
      56                 :            : {
      57                 :            :  public:
      58                 :            :    /**
      59                 :            :    * @param te Reference to the theory engine
      60                 :            :    * @param sharedSolver The shared solver that is being used in combination
      61                 :            :    * with this equality engine manager
      62                 :            :     */
      63                 :            :   EqEngineManager(Env& env, TheoryEngine& te, SharedSolver& shs);
      64                 :      49027 :   virtual ~EqEngineManager() {}
      65                 :            :   /**
      66                 :            :    * Initialize theories, called during TheoryEngine::finishInit after theory
      67                 :            :    * objects have been created but prior to their final initialization. This
      68                 :            :    * sets up equality engines for all theories.
      69                 :            :    *
      70                 :            :    * This method is context-independent, and is applied once during
      71                 :            :    * the lifetime of TheoryEngine (during finishInit).
      72                 :            :    */
      73                 :            :   virtual void initializeTheories() = 0;
      74                 :            :   /**
      75                 :            :    * Get the equality engine theory information for theory with the given id.
      76                 :            :    */
      77                 :            :   const EeTheoryInfo* getEeTheoryInfo(TheoryId tid) const;
      78                 :            : 
      79                 :            :   /** Allocate equality engine that is context-dependent on c with info esi */
      80                 :            :   eq::EqualityEngine* allocateEqualityEngine(EeSetupInfo& esi,
      81                 :            :                                              context::Context* c);
      82                 :            :   /**
      83                 :            :    * Notify this class that we are about to terminate with a model. This method
      84                 :            :    * is for debugging only.
      85                 :            :    *
      86                 :            :    * @param incomplete Whether we are answering "unknown" instead of "sat".
      87                 :            :    */
      88                 :         13 :   virtual void notifyModel(bool incomplete) {}
      89                 :            : 
      90                 :            :  protected:
      91                 :            :   /** Reference to the theory engine */
      92                 :            :   TheoryEngine& d_te;
      93                 :            :   /** Reference to the shared solver */
      94                 :            :   SharedSolver& d_sharedSolver;
      95                 :            :   /** Information related to the equality engine, per theory. */
      96                 :            :   std::map<TheoryId, EeTheoryInfo> d_einfo;
      97                 :            : };
      98                 :            : 
      99                 :            : }  // namespace theory
     100                 :            : }  // namespace cvc5::internal
     101                 :            : 
     102                 :            : #endif /* CVC5__THEORY__EE_MANAGER__H */