diff --git a/include/llvm/CFGdecls.h b/include/llvm/CFGdecls.h
index 8d4152fea0a..b59a1d25367 100644
--- a/include/llvm/CFGdecls.h
+++ b/include/llvm/CFGdecls.h
@@ -73,6 +73,7 @@ struct      BasicBlockGraph;
 struct ConstBasicBlockGraph;
 struct      InverseBasicBlockGraph;
 struct ConstInverseBasicBlockGraph;
+struct TypeGraph;
 
 // Forward declare iterator class template...
 template<class GraphInfo> class DFIterator;
@@ -104,6 +105,15 @@ inline idf_iterator       idf_end  (      BasicBlock *BB);
 inline idf_const_iterator idf_end  (const BasicBlock *BB);
 
 
+// Depth First Iterator Definitions for Types.  This lets you iterator over 
+// (possibly cyclic) type graphs in dfo
+//
+typedef DFIterator<TypeGraph> tdf_iterator;
+
+inline tdf_iterator tdf_begin(const Type *T, bool Reverse = false);
+inline tdf_iterator tdf_end  (const Type *T);
+
+
 //===--------------------------------------------------------------------===//
 // Post Order CFG iterator code
 //===--------------------------------------------------------------------===//