--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.xml/share/classes/com/sun/org/apache/bcel/internal/classfile/ConstantDynamic.java	Wed Jun 26 05:49:59 2019 +0000
@@ -0,0 +1,94 @@
+/*
+ * reserved comment block
+ * DO NOT REMOVE OR ALTER!
+ */
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+package com.sun.org.apache.bcel.internal.classfile;
+
+import java.io.DataInput;
+import java.io.IOException;
+
+import com.sun.org.apache.bcel.internal.Const;
+
+/**
+ * This class is derived from the abstract {@link Constant}
+ * and represents a reference to a dynamically computed constant.
+ *
+ * @see     Constant
+ * @see  <a href="https://bugs.openjdk.java.net/secure/attachment/74618/constant-dynamic.html">
+ * Change request for JEP 309</a>
+ * @since 6.3
+ */
+public final class ConstantDynamic extends ConstantCP {
+
+    /**
+     * Initialize from another object.
+     */
+    public ConstantDynamic(final ConstantDynamic c) {
+        this(c.getBootstrapMethodAttrIndex(), c.getNameAndTypeIndex());
+    }
+
+
+    /**
+     * Initialize instance from file data.
+     *
+     * @param file Input stream
+     * @throws IOException
+     */
+    ConstantDynamic(final DataInput file) throws IOException {
+        this(file.readShort(), file.readShort());
+    }
+
+
+    public ConstantDynamic(final int bootstrap_method_attr_index, final int name_and_type_index) {
+        super(Const.CONSTANT_Dynamic, bootstrap_method_attr_index, name_and_type_index);
+    }
+
+
+    /**
+     * Called by objects that are traversing the nodes of the tree implicitly
+     * defined by the contents of a Java class. I.e., the hierarchy of methods,
+     * fields, attributes, etc. spawns a tree of objects.
+     *
+     * @param v Visitor object
+     */
+    @Override
+    public void accept( final Visitor v ) {
+        v.visitConstantDynamic(this);
+    }
+
+    /**
+     * @return Reference (index) to bootstrap method this constant refers to.
+     *
+     * Note that this method is a functional duplicate of getClassIndex
+     * for use by ConstantInvokeDynamic.
+     * @since 6.0
+     */
+    public final int getBootstrapMethodAttrIndex() {
+        return super.getClassIndex();  // AKA bootstrap_method_attr_index
+    }
+
+    /**
+     * @return String representation
+     */
+    @Override
+    public final String toString() {
+        return super.toString().replace("class_index", "bootstrap_method_attr_index");
+    }
+}