--- old/src/share/vm/oops/constantPool.hpp	2017-06-29 15:57:41.904596067 -0700
+++ new/src/share/vm/oops/constantPool.hpp	2017-06-29 15:57:41.720588993 -0700
@@ -211,6 +211,9 @@
   ConstantPoolCache* cache() const        { return _cache; }
   void set_cache(ConstantPoolCache* cache){ _cache = cache; }
 
+  virtual void metaspace_pointers_do(MetaspaceClosure* iter);
+  virtual MetaspaceObj::Type type() const { return ConstantPoolType; }
+
   // Create object cache in the constant pool
   void initialize_resolved_references(ClassLoaderData* loader_data,
                                       const intStack& reference_map,
@@ -764,6 +767,9 @@
   void collect_statistics(KlassSizeStats *sz) const;
 #endif
 
+  // ConstantPools should be stored in the read-only region of CDS archive.
+  static bool is_read_only_by_default() { return true; }
+
   friend class ClassFileParser;
   friend class SystemDictionary;