Add a marker for the graph root.

llvm-svn: 19445

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
index db094a0a120..4a70642c4b5 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
@@ -32,6 +32,12 @@ namespace llvm {
     static std::string getNodeAttributes(const SDNode *N) {
       return "shape=Mrecord";
     }
+
+    static void addCustomGraphFeatures(SelectionDAG *G,
+                                       GraphWriter<SelectionDAG*> &GW) {
+      GW.emitSimpleNode(0, "plaintext=circle", "GraphRoot");
+      GW.emitEdge(0, -1, G->getRoot().Val, -1, "");
+    }
   };
 }