--- old/src/hotspot/os/windows/gc/z/zBackingFile_windows.hpp	2019-12-13 16:42:41.165877982 +0100
+++ new/src/hotspot/os/windows/gc/z/zBackingFile_windows.hpp	2019-12-13 16:42:40.586858865 +0100
@@ -44,6 +44,10 @@
 public:
   ZBackingFile();
 
+  bool is_initialized() const;
+
+  void warn_commit_limits(size_t max) const;
+
   size_t size() const;
 
   size_t commit(size_t offset, size_t length);