--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.graph/src/org/graalvm/compiler/graph/NodeStack.java	2017-03-20 17:38:01.000000000 -0700
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.graph/src/org/graalvm/compiler/graph/NodeStack.java	2017-03-20 17:38:01.000000000 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,6 +33,10 @@
         values = new Node[INITIAL_SIZE];
     }
 
+    public int size() {
+        return tos;
+    }
+
     public void push(Node n) {
         int newIndex = tos++;
         int valuesLength = values.length;
@@ -49,6 +53,10 @@
         values = newValues;
     }
 
+    public Node get(int index) {
+        return values[index];
+    }
+
     public Node pop() {
         assert tos > 0 : "stack must be non-empty";
         return values[--tos];