--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/UnexpectedResultException.java	Tue Dec 18 15:33:55 2012 +0100
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2012, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.api.nodes;
+
+/**
+ * An exception that should be thrown if the return value cannot be represented as a value of the return type. The
+ * Truffle optimizer has special knowledge of this exception class and will never compile a catch block that catches this
+ * exception type.
+ */
+public final class UnexpectedResultException extends SlowPathException {
+
+    private static final long serialVersionUID = 3676602078425211386L;
+    private final Object result;
+
+    /**
+     * Creates the exception with the alternative result that cannot be respresented as a value of the return type.
+     * @param result the alternative result
+     */
+    public UnexpectedResultException(Object result) {
+        super(null, null);
+        assert !(result instanceof Throwable);
+        this.result = result;
+    }
+
+    /**
+     * @return the unexpected result
+     */
+    public Object getResult() {
+        return result;
+    }
+
+    /**
+     * For performance reasons, this exception does not record any stack trace information.
+     */
+    @Override
+    public synchronized Throwable fillInStackTrace() {
+        return null;
+    }
+}