--- a/hotspot/src/share/vm/prims/whitebox.cpp	Thu Nov 12 14:03:14 2015 +0100
+++ b/hotspot/src/share/vm/prims/whitebox.cpp	Tue Aug 18 11:27:23 2015 -0700
@@ -1271,6 +1271,10 @@
                    attemptedNoSafepointValue == JNI_TRUE);
 WB_END
 
+WB_ENTRY(jboolean, WB_IsSharedClass(JNIEnv* env, jobject wb, jclass clazz))
+  return (jboolean)MetaspaceShared::is_in_shared_space(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz)));
+WB_END
+
 WB_ENTRY(jboolean, WB_IsMonitorInflated(JNIEnv* env, jobject wb, jobject obj))
   oop obj_oop = JNIHandles::resolve(obj);
   return (jboolean) obj_oop->mark()->has_monitor();
@@ -1471,6 +1475,7 @@
   {CC"runMemoryUnitTests", CC"()V",                   (void*)&WB_RunMemoryUnitTests},
   {CC"readFromNoaccessArea",CC"()V",                  (void*)&WB_ReadFromNoaccessArea},
   {CC"stressVirtualSpaceResize",CC"(JJJ)I",           (void*)&WB_StressVirtualSpaceResize},
+  {CC"isSharedClass", CC"(Ljava/lang/Class;)Z",       (void*)&WB_IsSharedClass },
 #if INCLUDE_ALL_GCS
   {CC"g1InConcurrentMark", CC"()Z",                   (void*)&WB_G1InConcurrentMark},
   {CC"g1IsHumongous0",      CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous     },