--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/oops/FieldVisitor.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2000, 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 sun.jvm.hotspot.oops;
+
+// An OopVisitor can be used to inspect all fields within an object.
+// Fields include vm fields, java fields, indexable fields.
+
+public interface FieldVisitor {
+  // Callback methods for each field type in an object
+  public void doMetadata(MetadataField field, boolean isVMField);
+  public void doOop(OopField field, boolean isVMField);
+  public void doOop(NarrowOopField field, boolean isVMField);
+  public void doByte(ByteField field, boolean isVMField);
+  public void doChar(CharField field, boolean isVMField);
+  public void doBoolean(BooleanField field, boolean isVMField);
+  public void doShort(ShortField field, boolean isVMField);
+  public void doInt(IntField field, boolean isVMField);
+  public void doLong(LongField field, boolean isVMField);
+  public void doFloat(FloatField field, boolean isVMField);
+  public void doDouble(DoubleField field, boolean isVMField);
+  public void doCInt(CIntField field, boolean isVMField);
+};