--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/lib/testlibrary/bytecode/jdk/experimental/bytecode/TypeTag.java	Fri Sep 08 10:46:46 2017 -0700
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2017, 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 jdk.experimental.bytecode;
+
+public enum TypeTag implements Type {
+    /**
+     * byte
+     */
+    B("B", 0, 1, 8),
+    /**
+     * short
+     */
+    S("S", 0, 1, 9),
+    /**
+     * int
+     */
+    I("I", 0, 1, 10),
+    /**
+     * float
+     */
+    F("F", 2, 1, 6),
+    /**
+     * long
+     */
+    J("J", 1, 2, 11),
+    /**
+     * double
+     */
+    D("D", 3, 2, 7),
+    /**
+     * Reference type
+     */
+    A("A", 4, 1, -1),
+    /**
+     * char
+     */
+    C("C", 0, 1, 5),
+    /**
+     * boolean
+     */
+    Z("Z", 0, 1, 4),
+    /**
+     * void
+     */
+    V("V", -1, -1, -1),
+    /**
+     * Value type
+     */
+    Q("Q", -1, 1, -1);
+
+    String typeStr;
+    int offset;
+    int width;
+    int newarraycode;
+
+    TypeTag(String typeStr, int offset, int width, int newarraycode) {
+        this.typeStr = typeStr;
+        this.offset = offset;
+        this.width = width;
+        this.newarraycode = newarraycode;
+    }
+
+    static TypeTag commonSupertype(TypeTag t1, TypeTag t2) {
+        if (t1.isIntegral() && t2.isIntegral()) {
+            int p1 = t1.ordinal();
+            int p2 = t2.ordinal();
+            return (p1 <= p2) ? t2 : t1;
+        } else {
+            return null;
+        }
+    }
+
+    public int width() {
+        return width;
+    }
+
+    boolean isIntegral() {
+        switch (this) {
+            case B:
+            case S:
+            case I:
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    @Override
+    public TypeTag getTag() {
+        return this;
+    }
+}