--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/objects/instancevariables/WriteInstanceVariableNode.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,63 @@
+/*
+ * 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.instancevariables;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.ruby.nodes.*;
+import com.oracle.truffle.ruby.runtime.*;
+import com.oracle.truffle.ruby.runtime.objects.*;
+
+public abstract class WriteInstanceVariableNode extends RubyNode implements WriteNode {
+
+    protected final String name;
+    @Child protected RubyNode receiver;
+    @Child protected RubyNode rhs;
+
+    public WriteInstanceVariableNode(RubyContext context, SourceSection sourceSection, String name, RubyNode receiver, RubyNode rhs) {
+        super(context, sourceSection);
+        this.name = name;
+        this.receiver = adoptChild(receiver);
+        this.rhs = adoptChild(rhs);
+    }
+
+    public WriteInstanceVariableNode respecialize(RubyBasicObject receiverObject) {
+        StorageLocation storageLocation = receiverObject.getObjectLayout().findStorageLocation(name);
+
+        if (storageLocation == null) {
+            throw new RuntimeException("Storage location should be found at this point");
+        }
+
+        if (storageLocation instanceof FixnumStorageLocation) {
+            return new WriteFixnumInstanceVariableNode(getContext(), getSourceSection(), name, receiver, rhs, storageLocation.getObjectLayout(), (FixnumStorageLocation) storageLocation);
+        } else if (storageLocation instanceof FloatStorageLocation) {
+            return new WriteFloatInstanceVariableNode(getContext(), getSourceSection(), name, receiver, rhs, storageLocation.getObjectLayout(), (FloatStorageLocation) storageLocation);
+        } else {
+            return new WriteObjectInstanceVariableNode(getContext(), getSourceSection(), name, receiver, rhs, storageLocation.getObjectLayout(), (ObjectStorageLocation) storageLocation);
+        }
+    }
+
+    @Override
+    public ReadInstanceVariableNode makeReadNode() {
+        return new UninitializedReadInstanceVariableNode(getContext(), getEncapsulatingSourceSection(), name, (RubyNode) receiver.copy());
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public RubyNode getReceiver() {
+        return receiver;
+    }
+
+    public RubyNode getRHS() {
+        return rhs;
+    }
+
+}