1 files changed, 74 insertions, 0 deletions
diff --git a/src/expr/proof_generator.cpp b/src/expr/proof_generator.cpp
new file mode 100644
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--- /dev/null
+++ b/src/expr/proof_generator.cpp
@@ -0,0 +1,74 @@
+/*********************                                                        */
+/*! \file proof_generator.cpp
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Andrew Reynolds
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Implementation of proof generator utility
+ **/
+
+#include "expr/proof_generator.h"
+
+#include "expr/proof.h"
+
+namespace CVC4 {
+
+std::ostream& operator<<(std::ostream& out, CDPOverwrite opol)
+{
+  switch (opol)
+  {
+    case CDPOverwrite::ALWAYS: out << "ALWAYS"; break;
+    case CDPOverwrite::ASSUME_ONLY: out << "ASSUME_ONLY"; break;
+    case CDPOverwrite::NEVER: out << "NEVER"; break;
+    default: out << "CDPOverwrite:unknown"; break;
+  }
+  return out;
+}
+
+ProofGenerator::ProofGenerator() {}
+
+ProofGenerator::~ProofGenerator() {}
+
+std::shared_ptr<ProofNode> ProofGenerator::getProofFor(Node f)
+{
+  Unreachable() << "ProofGenerator::getProofFor: " << identify()
+                << " has no implementation" << std::endl;
+  return nullptr;
+}
+
+bool ProofGenerator::addProofTo(Node f, CDProof* pf, CDPOverwrite opolicy)
+{
+  Trace("pfgen") << "ProofGenerator::addProofTo: " << f << "..." << std::endl;
+  Assert(pf != nullptr);
+  // plug in the proof provided by the generator, if it exists
+  std::shared_ptr<ProofNode> apf = getProofFor(f);
+  if (apf != nullptr)
+  {
+    if (Trace.isOn("pfgen"))
+    {
+      std::stringstream ss;
+      apf->printDebug(ss);
+      Trace("pfgen") << "...got proof " << ss.str() << std::endl;
+    }
+    // Add the proof, without deep copying.
+    if (pf->addProof(apf, opolicy, false))
+    {
+      Trace("pfgen") << "...success!" << std::endl;
+      return true;
+    }
+    Trace("pfgen") << "...failed to add proof" << std::endl;
+  }
+  else
+  {
+    Trace("pfgen") << "...failed, no proof" << std::endl;
+    Assert(false) << "Failed to get proof from generator for fact " << f;
+  }
+  return false;
+}
+
+}  // namespace CVC4