Index: llvm/include/llvm/ExecutionEngine/Orc/Core.h
===================================================================
--- llvm/include/llvm/ExecutionEngine/Orc/Core.h
+++ llvm/include/llvm/ExecutionEngine/Orc/Core.h
@@ -726,6 +726,9 @@
   /// the ExecutionSession.
   JITDylib &getMainJITDylib();
 
+  /// Return a pointer to the "name" JITDylib.
+  /// Ownership of JITDylib remains within Execution Session
+  JITDylib *getJITDylibByName(std::string Name);
   /// Add a new JITDylib to this ExecutionSession.
   JITDylib &createJITDylib(std::string Name,
                            bool AddToMainDylibSearchOrder = true);
Index: llvm/lib/ExecutionEngine/Orc/Core.cpp
===================================================================
--- llvm/lib/ExecutionEngine/Orc/Core.cpp
+++ llvm/lib/ExecutionEngine/Orc/Core.cpp
@@ -1610,8 +1610,19 @@
   return runSessionLocked([this]() -> JITDylib & { return *JDs.front(); });
 }
 
+JITDylib *ExecutionSession::getJITDylibByName(std::string Name) {
+  return runSessionLocked([&, this]() -> JITDylib * {
+    for (auto &JD : JDs) {
+      if (JD->getName() == Name)
+        return JD.get();
+    }
+    return nullptr;
+  });
+}
+
 JITDylib &ExecutionSession::createJITDylib(std::string Name,
                                            bool AddToMainDylibSearchOrder) {
+  assert(!getJITDylibByName(Name) && "JITDylib with that name already exists");
   return runSessionLocked([&, this]() -> JITDylib & {
     JDs.push_back(
         std::unique_ptr<JITDylib>(new JITDylib(*this, std::move(Name))));