--- a/src/hotspot/share/opto/node.hpp	Wed Aug 29 11:25:51 2018 +0100
+++ b/src/hotspot/share/opto/node.hpp	Wed Aug 22 10:29:17 2018 +0200
@@ -107,6 +107,7 @@
 class MachSpillCopyNode;
 class MachTempNode;
 class MachMergeNode;
+class MachMemBarNode;
 class Matcher;
 class MemBarNode;
 class MemBarStoreStoreNode;
@@ -659,6 +660,7 @@
       DEFINE_CLASS_ID(MachConstant,     Mach, 5)
         DEFINE_CLASS_ID(MachJump,       MachConstant, 0)
       DEFINE_CLASS_ID(MachMerge,        Mach, 6)
+      DEFINE_CLASS_ID(MachMemBar,       Mach, 7)
 
     DEFINE_CLASS_ID(Type,  Node, 2)
       DEFINE_CLASS_ID(Phi,   Type, 0)
@@ -852,6 +854,7 @@
   DEFINE_CLASS_QUERY(MachSafePoint)
   DEFINE_CLASS_QUERY(MachSpillCopy)
   DEFINE_CLASS_QUERY(MachTemp)
+  DEFINE_CLASS_QUERY(MachMemBar)
   DEFINE_CLASS_QUERY(MachMerge)
   DEFINE_CLASS_QUERY(Mem)
   DEFINE_CLASS_QUERY(MemBar)