--- old/src/share/vm/runtime/signature.hpp	2013-10-08 14:00:28.684650619 +0200
+++ new/src/share/vm/runtime/signature.hpp	2013-10-08 14:00:28.454156167 +0200
@@ -401,6 +401,9 @@
 
   // return same as_symbol except allocation of new symbols is avoided.
   Symbol* as_symbol_or_null();
+
+  // count the number of references in the signature
+  int reference_parameter_count();
 };
 
 class SignatureVerifier : public StackObj {