diff -r cc231bd80c8b -r 7638bf98a312 src/hotspot/share/runtime/vm_operations.hpp
--- a/src/hotspot/share/runtime/vm_operations.hpp	Sat Jan 13 02:56:22 2018 +0100
+++ b/src/hotspot/share/runtime/vm_operations.hpp	Tue Nov 21 09:47:55 2017 -0500
@@ -115,6 +115,7 @@
   template(ICBufferFull)                          \
   template(ScavengeMonitors)                      \
   template(PrintMetadata)                         \
+  template(GTestExecuteAtSafepoint)               \
 
 class VM_Operation: public CHeapObj<mtInternal> {
  public:
@@ -286,6 +287,17 @@
   bool is_cheap_allocated() const                { return true; }
 };
 
+// Base class for invoking parts of a gtest in a safepoint.
+// Derived classes provide the doit method.
+// Typically also need to transition the gtest thread from native to VM.
+class VM_GTestExecuteAtSafepoint: public VM_Operation {
+ public:
+  VMOp_Type type() const                         { return VMOp_GTestExecuteAtSafepoint; }
+
+ protected:
+  VM_GTestExecuteAtSafepoint() {}
+};
+
 class VM_Deoptimize: public VM_Operation {
  public:
   VM_Deoptimize() {}