--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.codegen.test/src/com/oracle/truffle/api/codegen/test/RuntimeStringTest.java	Tue Mar 12 11:38:24 2013 +0100
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2012, 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.codegen.test;
+
+import org.junit.*;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.codegen.*;
+import com.oracle.truffle.api.codegen.test.TypeSystemTest.TestRootNode;
+import com.oracle.truffle.api.codegen.test.TypeSystemTest.ValueNode;
+
+public class RuntimeStringTest {
+
+    @Test
+    public void testSubstr() {
+        assertExecute(new RuntimeString("es"), "substr", new RuntimeString("test"), 1, 3);
+    }
+
+    @Test
+    public void testConcat() {
+        assertExecute(new RuntimeString("concatconcat"), "concat", new RuntimeString("concat"), new RuntimeString("concat"));
+    }
+
+    @Test(expected = ArrayIndexOutOfBoundsException.class)
+    public void testConcatFail() {
+        assertExecute(new RuntimeString("concatconcat"), "concat", new RuntimeString("concat"));
+    }
+
+    @Test
+    public void testFindMethodByMethodName() {
+        // TODO
+    }
+
+    private static void assertExecute(Object expectedResult, String name, Object... argumentsArray) {
+        ArgNode[] args = new ArgNode[argumentsArray.length];
+        for (int i = 0; i < args.length; i++) {
+            args[i] = new ArgNode(argumentsArray, i);
+        }
+
+        BuiltinNode node = null;
+        for (NodeFactory<BuiltinNode> nodeFactory : RuntimeStringTestFactory.getFactories()) {
+            GeneratedBy generated = nodeFactory.getClass().getAnnotation(GeneratedBy.class);
+            Assert.assertNotNull(generated);
+            Assert.assertNotSame("", generated.methodName());
+            if (generated.methodName().equals(name)) {
+                node = nodeFactory.createNode((Object) args);
+                break;
+            }
+        }
+        Assert.assertNotNull("Node not found", node);
+        CallTarget target = Truffle.getRuntime().createCallTarget(new TestRootNode(node));
+        Assert.assertEquals(expectedResult, target.call());
+    }
+
+    static class ArgNode extends ValueNode {
+
+        final Object[] arguments;
+        final int index;
+
+        ArgNode(Object[] args, int index) {
+            this.arguments = args;
+            this.index = index;
+        }
+
+        @Override
+        Object execute() {
+            return arguments[index];
+        }
+    }
+
+    abstract static class BuiltinNode extends ValueNode {
+
+        @Children ArgNode[] parameters;
+
+        BuiltinNode(ArgNode[] parameters) {
+            this.parameters = adoptChildren(parameters);
+        }
+
+        BuiltinNode(BuiltinNode prev) {
+            this(prev.parameters);
+        }
+
+    }
+
+    @NodeClass(BuiltinNode.class)
+    static class RuntimeString {
+
+        private final String internal;
+
+        public RuntimeString(String internal) {
+            this.internal = internal;
+        }
+
+        @Specialization
+        static RuntimeString concat(RuntimeString s1, RuntimeString s2) {
+            return new RuntimeString(s1.internal + s2.internal);
+        }
+
+        @Specialization
+        RuntimeString substr(int beginIndex, int endIndex) {
+            return new RuntimeString(internal.substring(beginIndex, endIndex));
+        }
+
+        @Generic
+        RuntimeString substr(Object beginIndex, Object endIndex) {
+            return substr(convertInt(beginIndex), convertInt(endIndex));
+        }
+
+        static int convertInt(Object value) {
+            if (value instanceof Number) {
+                return ((Number) value).intValue();
+            } else if (value instanceof String) {
+                return Integer.parseInt((String) value);
+            }
+            throw new RuntimeException("Invalid datatype");
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (obj instanceof RuntimeString) {
+                return internal.equals(((RuntimeString) obj).internal);
+            }
+            return super.equals(obj);
+        }
+
+        @Override
+        public int hashCode() {
+            return internal.hashCode();
+        }
+
+        @Override
+        public String toString() {
+            return internal;
+        }
+
+    }
+
+}