--- old/src/hotspot/share/utilities/accessFlags.hpp	2019-12-03 19:37:17.000000000 -0800
+++ new/src/hotspot/share/utilities/accessFlags.hpp	2019-12-03 19:37:17.000000000 -0800
@@ -66,6 +66,7 @@
   JVM_ACC_IS_CLONEABLE_FAST       = (int)0x80000000,// True if klass implements the Cloneable interface and can be optimized in generated code
   JVM_ACC_HAS_FINAL_METHOD        = 0x01000000,     // True if klass has final method
   JVM_ACC_IS_SHARED_CLASS         = 0x02000000,     // True if klass is shared
+  JVM_ACC_IS_HIDDEN_CLASS         = 0x04000000,     // True if klass is hidden 
 
   // Klass* and Method* flags
   JVM_ACC_HAS_LOCAL_VARIABLE_TABLE= 0x00200000,
@@ -149,6 +150,7 @@
   bool has_final_method        () const { return (_flags & JVM_ACC_HAS_FINAL_METHOD       ) != 0; }
   bool is_cloneable_fast       () const { return (_flags & JVM_ACC_IS_CLONEABLE_FAST      ) != 0; }
   bool is_shared_class         () const { return (_flags & JVM_ACC_IS_SHARED_CLASS        ) != 0; }
+  bool is_hidden_class         () const { return (_flags & JVM_ACC_IS_HIDDEN_CLASS        ) != 0; }
 
   // Klass* and Method* flags
   bool has_localvariable_table () const { return (_flags & JVM_ACC_HAS_LOCAL_VARIABLE_TABLE) != 0; }
@@ -221,6 +223,7 @@
   void set_is_cloneable_fast()         { atomic_set_bits(JVM_ACC_IS_CLONEABLE_FAST);       }
   void set_has_miranda_methods()       { atomic_set_bits(JVM_ACC_HAS_MIRANDA_METHODS);     }
   void set_is_shared_class()           { atomic_set_bits(JVM_ACC_IS_SHARED_CLASS);         }
+  void set_is_hidden_class()           { atomic_set_bits(JVM_ACC_IS_HIDDEN_CLASS);         }
 
  public:
   // field flags