--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/core/ExceptionNodes.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,82 @@
+/*
+ * 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.core;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.ruby.runtime.*;
+import com.oracle.truffle.ruby.runtime.core.*;
+import com.oracle.truffle.ruby.runtime.core.array.*;
+
+@CoreClass(name = "Exception")
+public abstract class ExceptionNodes {
+
+    @CoreMethod(names = "initialize", minArgs = 0, maxArgs = 1)
+    public abstract static class InitializeNode extends CoreMethodNode {
+
+        public InitializeNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public InitializeNode(InitializeNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public NilPlaceholder initialize(RubyException exception, @SuppressWarnings("unused") UndefinedPlaceholder message) {
+            exception.initialize(getContext().makeString(" "));
+            return NilPlaceholder.INSTANCE;
+        }
+
+        @Specialization
+        public NilPlaceholder initialize(RubyException exception, RubyString message) {
+            exception.initialize(message);
+            return NilPlaceholder.INSTANCE;
+        }
+
+    }
+
+    @CoreMethod(names = "backtrace", needsSelf = false, maxArgs = 0)
+    public abstract static class BacktraceNode extends CoreMethodNode {
+
+        public BacktraceNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public BacktraceNode(BacktraceNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public RubyArray backtrace() {
+            return new RubyArray(getContext().getCoreLibrary().getArrayClass());
+        }
+
+    }
+
+    @CoreMethod(names = "message", maxArgs = 0)
+    public abstract static class MessageNode extends CoreMethodNode {
+
+        public MessageNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public MessageNode(MessageNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public RubyString message(RubyException exception) {
+            return exception.getMessage();
+        }
+
+    }
+
+}