--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/RootCallTarget.java	Fri Apr 11 11:52:19 2014 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/RootCallTarget.java	Fri Apr 11 11:53:11 2014 +0200
@@ -24,6 +24,7 @@
  */
 package com.oracle.truffle.api;
 
+import com.oracle.truffle.api.frame.*;
 import com.oracle.truffle.api.nodes.*;
 
 /**
@@ -48,4 +49,13 @@
     public final RootNode getRootNode() {
         return rootNode;
     }
+
+    protected final Object callProxy(VirtualFrame frame) {
+        try {
+            return getRootNode().execute(frame);
+        } finally {
+            // this assertion is needed to keep the values from being cleared as non-live locals
+            assert frame != null && this != null;
+        }
+    }
 }