--- old/src/share/vm/gc_implementation/parallelScavenge/psScavenge.hpp	2019-01-28 17:43:44.000000000 +0800
+++ new/src/share/vm/gc_implementation/parallelScavenge/psScavenge.hpp	2019-01-28 17:43:44.000000000 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2019, 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
@@ -93,6 +93,8 @@
   // Private accessors
   static CardTableExtension* const card_table()       { assert(_card_table != NULL, "Sanity"); return _card_table; }
 
+  static const ParallelScavengeTracer* gc_tracer() { return &_gc_tracer; }
+
  public:
   // Accessors
   static uint             tenuring_threshold()  { return _tenuring_threshold; }