src/hotspot/share/oops/instanceKlass.hpp

@@ -255,11 +255,12 @@
  public:
   enum {
     _extra_is_being_redefined   = 1 << 0, // used for locking redefinition
     _extra_has_resolved_methods = 1 << 1, // resolved methods table entries added for this class
     _extra_has_value_fields     = 1 << 2, // has value fields and related embedded section is not empty
-    _extra_is_bufferable        = 1 << 3  // value can be buffered out side of the Java heap
+    _extra_is_bufferable        = 1 << 3, // value can be buffered out side of the Java heap
+    _extra_is_empty_value       = 1 << 4  // empty value type
   };
 
  protected:
   u1              _extra_flags;
 

@@ -422,10 +423,17 @@
   }
   void set_has_value_fields()  {
     _extra_flags |= _extra_has_value_fields;
   }
 
+  bool is_empty_value() const {
+    return (_extra_flags & _extra_is_empty_value) != 0;
+  }
+  void set_is_empty_value() {
+    _extra_flags |= _extra_is_empty_value;
+  }
+
   // field sizes
   int nonstatic_field_size() const         { return _nonstatic_field_size; }
   void set_nonstatic_field_size(int size)  { _nonstatic_field_size = size; }
 
   int static_field_size() const            { return _static_field_size; }