--- /dev/null	2020-01-17 11:46:19.065201212 +0100
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/shenandoah/ShenandoahHeapRegion.java	2020-01-17 17:10:56.410127928 +0100
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2017, Red Hat, Inc. All rights reserved.
+ *
+ * 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.gc.shenandoah;
+
+import sun.jvm.hotspot.gc.shared.ContiguousSpace;
+import sun.jvm.hotspot.types.CIntegerField;
+import sun.jvm.hotspot.runtime.VM;
+import sun.jvm.hotspot.types.Type;
+import sun.jvm.hotspot.types.TypeDataBase;
+import sun.jvm.hotspot.debugger.Address;
+
+import java.util.Observable;
+import java.util.Observer;
+
+
+public class ShenandoahHeapRegion extends ContiguousSpace {
+    private static CIntegerField RegionSizeBytes;
+    static {
+        VM.registerVMInitializedObserver(new Observer() {
+            public void update(Observable o, Object data) {
+                initialize(VM.getVM().getTypeDataBase());
+            }
+        });
+    }
+
+    static private synchronized void initialize(TypeDataBase db) {
+        Type type = db.lookupType("ShenandoahHeapRegion");
+        RegionSizeBytes = type.getCIntegerField("RegionSizeBytes");
+    }
+
+    public static long regionSizeBytes() { return RegionSizeBytes.getValue(); }
+
+    public ShenandoahHeapRegion(Address addr) {
+        super(addr);
+    }
+}