diff --git a/llvm/lib/Support/GraphWriter.cpp b/llvm/lib/Support/GraphWriter.cpp
new file mode 100644
index 0000000..73126e2
--- /dev/null
+++ b/llvm/lib/Support/GraphWriter.cpp
@@ -0,0 +1,89 @@
+//===-- GraphWriter.cpp - Implements GraphWriter support routines ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements misc. GraphWriter support routines.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/System/Path.h"
+#include "llvm/System/Program.h"
+#include "llvm/Config/config.h"
+
+#include <iostream>
+
+using namespace llvm;
+
+namespace llvm {
+
+void DisplayGraph(const sys::Path& Filename)
+{
+#if HAVE_GRAPHVIZ
+  sys::Path Graphviz(LLVM_PATH_GRAPHVIZ);
+
+  std::vector<const char*> args;
+  args.push_back(Graphviz.c_str());
+  args.push_back(Filename.c_str());
+  args.push_back(0);
+  
+  std::cerr << "Running 'Graphviz' program... " << std::flush;
+  if (sys::Program::ExecuteAndWait(Graphviz, &args[0])) {
+    std::cerr << "Error viewing graph: 'Graphviz' not in path?\n";
+  }
+#elif (HAVE_GV && HAVE_DOT)
+  sys::Path PSFilename = Filename;
+  PSFilename.appendSuffix("ps");
+  
+  sys::Path dot(LLVM_PATH_DOT);
+
+  std::vector<const char*> args;
+  args.push_back(dot.c_str());
+  args.push_back("-Tps");
+  args.push_back("-Nfontname=Courier");
+  args.push_back("-Gsize=7.5,10");
+  args.push_back(Filename.c_str());
+  args.push_back("-o");
+  args.push_back(PSFilename.c_str());
+  args.push_back(0);
+  
+  std::cerr << "Running 'dot' program... " << std::flush;
+  if (sys::Program::ExecuteAndWait(dot, &args[0])) {
+    std::cerr << "Error viewing graph: 'dot' not in path?\n";
+  } else {
+    std::cerr << " done. \n";
+
+    sys::Path gv(LLVM_PATH_GV);
+    args.clear();
+    args.push_back(gv.c_str());
+    args.push_back(PSFilename.c_str());
+    args.push_back(0);
+    
+    sys::Program::ExecuteAndWait(gv, &args[0]);
+  }
+  PSFilename.eraseFromDisk();
+#elif HAVE_DOTTY
+  sys::Path dotty(LLVM_PATH_DOTTY);
+
+  std::vector<const char*> args;
+  args.push_back(Filename.c_str());
+  args.push_back(0);
+  
+  std::cerr << "Running 'dotty' program... " << std::flush;
+  if (sys::Program::ExecuteAndWait(dotty, &args[0])) {
+    std::cerr << "Error viewing graph: 'dotty' not in path?\n";
+  } else {
+#ifdef __MINGW32__ // Dotty spawns another app and doesn't wait until it returns.
+    return;
+#endif
+  }
+#endif
+  
+  Filename.eraseFromDisk();
+}
+
+} // End llvm namespace