--- a/src/hotspot/share/memory/metaspace.hpp	Thu Oct 04 14:03:13 2018 +0200
+++ b/src/hotspot/share/memory/metaspace.hpp	Thu Oct 04 16:39:07 2018 +0200
@@ -71,6 +71,7 @@
   class PrintCLDMetaspaceInfoClosure;
   class SpaceManager;
   class VirtualSpaceList;
+  class VirtualSpaceNode;
 }
 
 // Metaspaces each have a  SpaceManager and allocations
@@ -297,6 +298,10 @@
   // Spacemanager updates running counters.
   friend class metaspace::SpaceManager;
 
+  // Special access for error reporting (checks without locks).
+  friend class oopDesc;
+  friend class Klass;
+
   // Running counters for statistics concerning in-use chunks.
   // Note: capacity = used + free + waste + overhead. Note that we do not
   // count free and waste. Their sum can be deduces from the three other values.
@@ -324,6 +329,12 @@
   // Helper for print_xx_report.
   static void print_vs(outputStream* out, size_t scale);
 
+  // Utils to check if a pointer or range is part of a committed metaspace region
+  // without acquiring any locks.
+  static metaspace::VirtualSpaceNode* find_enclosing_virtual_space(const void* p);
+  static bool is_in_committed(const void* p);
+  static bool is_range_in_committed(const void* from, const void* to);
+
 public:
 
   // Collect used metaspace statistics. This involves walking the CLDG. The resulting