diff --git a/js/rhino/src/org/mozilla/javascript/Interpreter.java b/js/rhino/src/org/mozilla/javascript/Interpreter.java
index 8c1196e82f05..75416b0b9a4d 100644
--- a/js/rhino/src/org/mozilla/javascript/Interpreter.java
+++ b/js/rhino/src/org/mozilla/javascript/Interpreter.java
@@ -255,6 +255,7 @@ public class Interpreter
             jsi.scriptOrFn = def;
             jsi.itsData = new InterpreterData(itsData.securityDomain,
                                               itsData.languageVersion);
+            jsi.itsData.parentData = itsData;
             jsi.itsData.itsSourceFile = itsData.itsSourceFile;
             jsi.itsData.encodedSource = itsData.encodedSource;
             jsi.itsData.itsCheckThis = def.getCheckThis();
diff --git a/js/rhino/src/org/mozilla/javascript/InterpreterData.java b/js/rhino/src/org/mozilla/javascript/InterpreterData.java
index f965a3acc947..8271242f980f 100644
--- a/js/rhino/src/org/mozilla/javascript/InterpreterData.java
+++ b/js/rhino/src/org/mozilla/javascript/InterpreterData.java
@@ -100,6 +100,8 @@ final class InterpreterData implements Serializable, DebuggableScript
 
     boolean topLevel;
 
+    InterpreterData parentData;
+
     public boolean isTopLevel()
     {
         return topLevel;
@@ -139,4 +141,10 @@ final class InterpreterData implements Serializable, DebuggableScript
     {
         return itsNestedFunctions[index];
     }
+
+    public DebuggableScript getParent()
+    {
+         return parentData;
+    }
+
 }
diff --git a/js/rhino/src/org/mozilla/javascript/debug/DebuggableScript.java b/js/rhino/src/org/mozilla/javascript/debug/DebuggableScript.java
index 93487c06d2ae..104e5df0d034 100644
--- a/js/rhino/src/org/mozilla/javascript/debug/DebuggableScript.java
+++ b/js/rhino/src/org/mozilla/javascript/debug/DebuggableScript.java
@@ -83,4 +83,6 @@ public interface DebuggableScript
 
     public DebuggableScript getFunction(int index);
 
+    public DebuggableScript getParent();
+
 }