--- a/hotspot/src/share/vm/runtime/fieldDescriptor.cpp	Fri May 18 14:57:28 2012 -0700
+++ b/hotspot/src/share/vm/runtime/fieldDescriptor.cpp	Mon May 21 14:10:35 2012 -0400
@@ -28,6 +28,7 @@
 #include "memory/resourceArea.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/instanceKlass.hpp"
+#include "oops/fieldStreams.hpp"
 #include "runtime/fieldDescriptor.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/signature.hpp"
@@ -37,6 +38,20 @@
   return instanceKlass::cast(_cp->pool_holder())->class_loader();
 }
 
+Symbol* fieldDescriptor::generic_signature() const {
+  int idx = 0;
+  instanceKlass* ik = instanceKlass::cast(field_holder());
+  for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
+    if (idx == _index) {
+      return fs.generic_signature();
+    } else {
+      idx ++;
+    }
+  }
+  assert(false, "should never happen");
+  return NULL;
+}
+
 typeArrayOop fieldDescriptor::annotations() const {
   instanceKlass* ik = instanceKlass::cast(field_holder());
   objArrayOop md = ik->fields_annotations();