--- /dev/null	2020-01-14 10:13:11.907818291 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahObjectMarker.hpp	2020-02-21 11:14:41.416216678 +0100
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2020, Red Hat, Inc. 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.
+ *
+ */
+
+#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHOBJECTMARKER_HPP
+#define SHARE_GC_SHENANDOAH_SHENANDOAHOBJECTMARKER_HPP
+
+#include "gc/shared/objectMarker.hpp"
+
+class MarkBitMap;
+class ShenandoahHeap;
+
+class ShenandoahObjectMarker : public ObjectMarker {
+private:
+  ShenandoahHeap* const _heap;
+  MarkBitMap*           _bit_map;
+
+public:
+  ShenandoahObjectMarker(ShenandoahHeap* heap, MarkBitMap* bitmap) :
+    _heap(heap), _bit_map(bitmap) {
+  }
+
+  bool init();
+  void done();
+
+  bool mark(oop o);
+  bool marked(oop o);
+};
+
+#endif // SHARE_GC_SHENANDOAH_SHENANDOAHOBJECTMARKER_HPP