diff -r fa2f93f99dbc -r b96466cdfc45 src/hotspot/share/memory/metaspaceShared.hpp
--- a/src/hotspot/share/memory/metaspaceShared.hpp	Fri Jul 06 15:22:07 2018 -0400
+++ b/src/hotspot/share/memory/metaspaceShared.hpp	Sun Jul 08 12:43:05 2018 -0400
@@ -232,6 +232,8 @@
   static char* misc_code_space_alloc(size_t num_bytes);
   static char* read_only_space_alloc(size_t num_bytes);
 
+  static char* read_only_space_top();
+
   template <typename T>
   static Array<T>* new_ro_array(int length) {
 #if INCLUDE_CDS