--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/objects/ReadClassVariableNode.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package com.oracle.truffle.ruby.nodes.objects;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.ruby.nodes.*;
+import com.oracle.truffle.ruby.runtime.*;
+import com.oracle.truffle.ruby.runtime.core.*;
+
+@NodeInfo(shortName = "read-class-variable")
+public class ReadClassVariableNode extends RubyNode {
+
+    protected final String name;
+    @Child protected RubyNode module;
+
+    public ReadClassVariableNode(RubyContext context, SourceSection sourceSection, String name, RubyNode module) {
+        super(context, sourceSection);
+        this.name = name;
+        this.module = adoptChild(module);
+    }
+
+    @Override
+    public Object execute(VirtualFrame frame) {
+        final RubyObject object = (RubyObject) module.execute(frame);
+
+        RubyModule moduleObject;
+
+        // TODO(CS): this cannot be right
+
+        if (object instanceof RubyModule) {
+            moduleObject = (RubyModule) object;
+        } else {
+            moduleObject = object.getRubyClass();
+        }
+
+        final Object value = moduleObject.lookupClassVariable(name);
+
+        if (value == null) {
+            // TODO(CS): is this right?
+            return NilPlaceholder.INSTANCE;
+        }
+
+        return value;
+    }
+
+    @Override
+    public Object isDefined(VirtualFrame frame) {
+        final RubyContext context = getContext();
+
+        final RubyObject object = (RubyObject) module.execute(frame);
+
+        RubyModule moduleObject;
+
+        if (object instanceof RubyModule) {
+            moduleObject = (RubyModule) object;
+        } else {
+            moduleObject = object.getRubyClass();
+        }
+
+        final Object value = moduleObject.lookupClassVariable(name);
+
+        if (value == null) {
+            return NilPlaceholder.INSTANCE;
+        } else {
+            return context.makeString("class variable");
+        }
+    }
+
+}