diff --git a/lib/Driver/Phases.cpp b/lib/Driver/Phases.cpp
new file mode 100644
index 0000000..704540e
--- /dev/null
+++ b/lib/Driver/Phases.cpp
@@ -0,0 +1,27 @@
+//===--- Phases.cpp - Transformations on Driver Types -------------------*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Driver/Phases.h"
+
+#include <cassert>
+
+using namespace clang::driver;
+
+const char *phases::getPhaseName(ID Id) {
+  switch (Id) {
+  case Preprocess: return "preprocess";
+  case Precompile: return "precompile";
+  case Compile: return "compile";
+  case Assemble: return "assemble";
+  case Link: return "link";
+  }
+
+  assert(0 && "Invalid phase id.");
+  return 0;
+}