src/theory/shared_solver_distributed.cpp

   1 /*********************                                                        */
   2 /*! \file shared_solver_distributed.cpp
   3  ** \verbatim
   4  ** Top contributors (to current version):
   5  **   Andrew Reynolds
   6  ** This file is part of the CVC4 project.
   7  ** Copyright (c) 2009-2020 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.\endverbatim
  11  **
  12  ** \brief Shared solver in the distributed architecture
  13  **/
  14
  15 #include "theory/shared_solver_distributed.h"
  16
  17 #include "theory/theory_engine.h"
  18
  19 namespace CVC4 {
  20 namespace theory {
  21
  22 SharedSolverDistributed::SharedSolverDistributed(TheoryEngine& te,
  23                                                  ProofNodeManager* pnm)
  24     : SharedSolver(te, pnm)
  25 {
  26 }
  27
  28 bool SharedSolverDistributed::needsEqualityEngine(theory::EeSetupInfo& esi)
  29 {
  30   return d_sharedTerms.needsEqualityEngine(esi);
  31 }
  32
  33 void SharedSolverDistributed::setEqualityEngine(eq::EqualityEngine* ee)
  34 {
  35   d_sharedTerms.setEqualityEngine(ee);
  36 }
  37
  38 void SharedSolverDistributed::preRegisterSharedInternal(TNode t)
  39 {
  40   if (t.getKind() == kind::EQUAL)
  41   {
  42     // When sharing is enabled, we propagate from the shared terms manager also
  43     d_sharedTerms.addEqualityToPropagate(t);
  44   }
  45 }
  46
  47 EqualityStatus SharedSolverDistributed::getEqualityStatus(TNode a, TNode b)
  48 {
  49   // if we're using a shared terms database, ask its status if a and b are
  50   // shared.
  51   if (d_sharedTerms.isShared(a) && d_sharedTerms.isShared(b))
  52   {
  53     if (d_sharedTerms.areEqual(a, b))
  54     {
  55       return EQUALITY_TRUE_AND_PROPAGATED;
  56     }
  57     else if (d_sharedTerms.areDisequal(a, b))
  58     {
  59       return EQUALITY_FALSE_AND_PROPAGATED;
  60     }
  61   }
  62   // otherwise, ask the theory
  63   return d_te.theoryOf(Theory::theoryOf(a.getType()))->getEqualityStatus(a, b);
  64 }
  65
  66 TrustNode SharedSolverDistributed::explain(TNode literal, TheoryId id)
  67 {
  68   TrustNode texp;
  69   if (id == THEORY_BUILTIN)
  70   {
  71     // explanation using the shared terms database
  72     texp = d_sharedTerms.explain(literal);
  73     Trace("shared-solver")
  74         << "\tTerm was propagated by THEORY_BUILTIN. Explanation: "
  75         << texp.getNode() << std::endl;
  76   }
  77   else
  78   {
  79     // By default, we ask the individual theory for the explanation.
  80     // It is possible that a centralized approach could preempt this.
  81     texp = d_te.theoryOf(id)->explain(literal);
  82     Trace("shared-solver") << "\tTerm was propagated by owner theory: " << id
  83                            << ". Explanation: " << texp.getNode() << std::endl;
  84   }
  85   return texp;
  86 }
  87
  88 void SharedSolverDistributed::assertSharedEquality(TNode equality,
  89                                                    bool polarity,
  90                                                    TNode reason)
  91 {
  92   d_sharedTerms.assertEquality(equality, polarity, reason);
  93 }
  94
  95 }  // namespace theory
  96 }  // namespace CVC4