--- a/src/hotspot/share/prims/whitebox.cpp	Tue Nov 07 14:13:18 2017 -0800
+++ b/src/hotspot/share/prims/whitebox.cpp	Tue Nov 07 18:48:17 2017 -0500
@@ -1715,6 +1715,10 @@
   }
 WB_END
 
+WB_ENTRY(jboolean, WB_AreOpenArchiveHeapObjectsMapped(JNIEnv* env))
+  return MetaspaceShared::open_archive_heap_region_mapped();
+WB_END
+
 WB_ENTRY(jboolean, WB_IsCDSIncludedInVmBuild(JNIEnv* env))
 #if INCLUDE_CDS
   return true;
@@ -2031,6 +2035,7 @@
   {CC"isSharedClass",      CC"(Ljava/lang/Class;)Z",  (void*)&WB_IsSharedClass },
   {CC"areSharedStringsIgnored",           CC"()Z",    (void*)&WB_AreSharedStringsIgnored },
   {CC"getResolvedReferences", CC"(Ljava/lang/Class;)Ljava/lang/Object;", (void*)&WB_GetResolvedReferences},
+  {CC"areOpenArchiveHeapObjectsMapped",   CC"()Z",    (void*)&WB_AreOpenArchiveHeapObjectsMapped},
   {CC"isCDSIncludedInVmBuild",            CC"()Z",    (void*)&WB_IsCDSIncludedInVmBuild },
   {CC"clearInlineCaches0",  CC"(Z)V",                 (void*)&WB_ClearInlineCaches },
   {CC"addCompilerDirective",    CC"(Ljava/lang/String;)I",