src/expr/proof_generator.cpp

   1 /*********************                                                        */
   2 /*! \file proof_generator.cpp
   3  ** \verbatim
   4  ** Top contributors (to current version):
   5  **   Andrew Reynolds
   6  ** This file is part of the CVC4 project.
   7  ** Copyright (c) 2009-2019 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 Implementation of proof generator utility
  13  **/
  14
  15 #include "expr/proof_generator.h"
  16
  17 #include "expr/proof.h"
  18
  19 namespace CVC4 {
  20
  21 ProofGenerator::ProofGenerator() {}
  22
  23 ProofGenerator::~ProofGenerator() {}
  24
  25 std::shared_ptr<ProofNode> ProofGenerator::getProofFor(Node f)
  26 {
  27   Unreachable() << "ProofGenerator::getProofFor: " << identify()
  28                 << " has no implementation" << std::endl;
  29   return nullptr;
  30 }
  31
  32 bool ProofGenerator::addProofTo(Node f, CDProof* pf, CDPOverwrite opolicy)
  33 {
  34   Trace("pfgen") << "ProofGenerator::addProofTo: " << f << "..." << std::endl;
  35   Assert(pf != nullptr);
  36   // plug in the proof provided by the generator, if it exists
  37   std::shared_ptr<ProofNode> apf = getProofFor(f);
  38   if (apf != nullptr)
  39   {
  40     if (Trace.isOn("pfgen"))
  41     {
  42       std::stringstream ss;
  43       apf->printDebug(ss);
  44       Trace("pfgen") << "...got proof " << ss.str() << std::endl;
  45     }
  46     // Add the proof, without deep copying.
  47     if (pf->addProof(apf, opolicy, false))
  48     {
  49       Trace("pfgen") << "...success!" << std::endl;
  50       return true;
  51     }
  52     Trace("pfgen") << "...failed to add proof" << std::endl;
  53   }
  54   else
  55   {
  56     Trace("pfgen") << "...failed, no proof" << std::endl;
  57     Assert(false) << "Failed to get proof from generator for fact " << f;
  58   }
  59   return false;
  60 }
  61
  62 PRefProofGenerator::PRefProofGenerator(CDProof* cd) : d_proof(cd) {}
  63
  64 PRefProofGenerator::~PRefProofGenerator() {}
  65
  66 std::shared_ptr<ProofNode> PRefProofGenerator::getProofFor(Node f)
  67 {
  68   Trace("pfgen") << "PRefProofGenerator::getProofFor: " << f << std::endl;
  69   return d_proof->mkProof(f);
  70 }
  71
  72 std::string PRefProofGenerator::identify() const
  73 {
  74   return "PRefProofGenerator";
  75 }
  76
  77 }  // namespace CVC4