--- old/src/hotspot/share/gc/shared/collectedHeap.hpp	2020-02-21 11:14:38.536168483 +0100
+++ new/src/hotspot/share/gc/shared/collectedHeap.hpp	2020-02-21 11:14:38.332165070 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2020, 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
@@ -27,6 +27,7 @@
 
 #include "gc/shared/gcCause.hpp"
 #include "gc/shared/gcWhen.hpp"
+#include "gc/shared/objectMarker.hpp"
 #include "gc/shared/verifyOption.hpp"
 #include "memory/allocation.hpp"
 #include "runtime/handles.hpp"
@@ -383,6 +384,9 @@
   virtual GrowableArray<GCMemoryManager*> memory_managers() = 0;
   virtual GrowableArray<MemoryPool*> memory_pools() = 0;
 
+  // ObjectMarker for JVMTI heap walk
+  virtual ObjectMarker* object_marker();
+
   // Iterate over all objects, calling "cl.do_object" on each.
   virtual void object_iterate(ObjectClosure* cl) = 0;