diff -r 000000000000 -r 959103a6100f src/share/classes/com/sun/tools/javac/jvm/ClassFile.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/classes/com/sun/tools/javac/jvm/ClassFile.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,196 @@
+/*
+ * Copyright (c) 1999, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.sun.tools.javac.jvm;
+
+import com.sun.tools.javac.code.Type;
+import com.sun.tools.javac.code.Types;
+import com.sun.tools.javac.code.Types.UniqueType;
+import com.sun.tools.javac.util.Name;
+
+
+/** A JVM class file.
+ *
+ *  <p>Generic Java classfiles have one additional attribute for classes,
+ *  methods and fields:
+ *  <pre>
+ *   "Signature" (u4 attr-length, u2 signature-index)
+ *  </pre>
+ *
+ *  <p>A signature gives the full Java type of a method or field. When
+ *  used as a class attribute, it indicates type parameters, followed
+ *  by supertype, followed by all interfaces.
+ *  <pre>
+ *     methodOrFieldSignature ::= type
+ *     classSignature         ::= [ typeparams ] supertype { interfacetype }
+ *  </pre>
+ *  <p>The type syntax in signatures is extended as follows:
+ *  <pre>{@literal
+ *     type       ::= ... | classtype | methodtype | typevar
+ *     classtype  ::= classsig { '.' classsig }
+ *     classig    ::= 'L' name [typeargs] ';'
+ *     methodtype ::= [ typeparams ] '(' { type } ')' type
+ *     typevar    ::= 'T' name ';'
+ *     typeargs   ::= '<' type { type } '>'
+ *     typeparams ::= '<' typeparam { typeparam } '>'
+ *     typeparam  ::= name ':' type
+ *  }</pre>
+ *  <p>This class defines constants used in class files as well
+ *  as routines to convert between internal ``.'' and external ``/''
+ *  separators in class names.
+ *
+ *  <p><b>This is NOT part of any supported API.
+ *  If you write code that depends on this, you do so at your own risk.
+ *  This code and its internal interfaces are subject to change or
+ *  deletion without notice.</b> */
+public class ClassFile {
+
+    public final static int JAVA_MAGIC = 0xCAFEBABE;
+
+    // see Target
+    public final static int CONSTANT_Utf8 = 1;
+    public final static int CONSTANT_Unicode = 2;
+    public final static int CONSTANT_Integer = 3;
+    public final static int CONSTANT_Float = 4;
+    public final static int CONSTANT_Long = 5;
+    public final static int CONSTANT_Double = 6;
+    public final static int CONSTANT_Class = 7;
+    public final static int CONSTANT_String = 8;
+    public final static int CONSTANT_Fieldref = 9;
+    public final static int CONSTANT_Methodref = 10;
+    public final static int CONSTANT_InterfaceMethodref = 11;
+    public final static int CONSTANT_NameandType = 12;
+    public final static int CONSTANT_MethodHandle = 15;
+    public final static int CONSTANT_MethodType = 16;
+    public final static int CONSTANT_InvokeDynamic = 18;
+
+    public final static int REF_getField = 1;
+    public final static int REF_getStatic = 2;
+    public final static int REF_putField = 3;
+    public final static int REF_putStatic = 4;
+    public final static int REF_invokeVirtual = 5;
+    public final static int REF_invokeStatic = 6;
+    public final static int REF_invokeSpecial = 7;
+    public final static int REF_newInvokeSpecial = 8;
+    public final static int REF_invokeInterface = 9;
+
+    public final static int MAX_PARAMETERS = 0xff;
+    public final static int MAX_DIMENSIONS = 0xff;
+    public final static int MAX_CODE = 0xffff;
+    public final static int MAX_LOCALS = 0xffff;
+    public final static int MAX_STACK = 0xffff;
+
+    public enum Version {
+        V45_3(45, 3), // base level for all attributes
+        V49(49, 0),   // JDK 1.5: enum, generics, annotations
+        V50(50, 0),   // JDK 1.6: stackmaps
+        V51(51, 0),   // JDK 1.7
+        V52(52, 0);   // JDK 1.8: lambda, type annos, param names
+        Version(int major, int minor) {
+            this.major = major;
+            this.minor = minor;
+        }
+        public final int major, minor;
+    }
+
+
+/************************************************************************
+ * String Translation Routines
+ ***********************************************************************/
+
+    /** Return internal representation of buf[offset..offset+len-1],
+     *  converting '/' to '.'.
+     */
+    public static byte[] internalize(byte[] buf, int offset, int len) {
+        byte[] translated = new byte[len];
+        for (int j = 0; j < len; j++) {
+            byte b = buf[offset + j];
+            if (b == '/') translated[j] = (byte) '.';
+            else translated[j] = b;
+        }
+        return translated;
+    }
+
+    /** Return internal representation of given name,
+     *  converting '/' to '.'.
+     */
+    public static byte[] internalize(Name name) {
+        return internalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
+    }
+
+    /** Return external representation of buf[offset..offset+len-1],
+     *  converting '.' to '/'.
+     */
+    public static byte[] externalize(byte[] buf, int offset, int len) {
+        byte[] translated = new byte[len];
+        for (int j = 0; j < len; j++) {
+            byte b = buf[offset + j];
+            if (b == '.') translated[j] = (byte) '/';
+            else translated[j] = b;
+        }
+        return translated;
+    }
+
+    /** Return external representation of given name,
+     *  converting '/' to '.'.
+     */
+    public static byte[] externalize(Name name) {
+        return externalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
+    }
+
+/************************************************************************
+ * Name-and-type
+ ***********************************************************************/
+
+    /** A class for the name-and-type signature of a method or field.
+     */
+    public static class NameAndType {
+        Name name;
+        UniqueType uniqueType;
+        Types types;
+
+        NameAndType(Name name, Type type, Types types) {
+            this.name = name;
+            this.uniqueType = new UniqueType(type, types);
+            this.types = types;
+        }
+
+        void setType(Type type) {
+            this.uniqueType = new UniqueType(type, types);
+        }
+
+        @Override
+        public boolean equals(Object other) {
+            return (other instanceof NameAndType &&
+                    name == ((NameAndType) other).name &&
+                        uniqueType.equals(((NameAndType) other).uniqueType));
+        }
+
+        @Override
+        public int hashCode() {
+            return name.hashCode() * uniqueType.hashCode();
+        }
+    }
+}