src/hotspot/share/oops/valueKlass.cpp

@@ -128,10 +128,18 @@
   instanceOop oop = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
   assert(oop->mark().is_always_locked(), "Unlocked value type");
   return oop;
 }
 
+instanceOop ValueKlass::allocate_instance_buffer(TRAPS) {
+  int size = size_helper();  // Query before forming handle.
+
+  instanceOop oop = (instanceOop)Universe::heap()->obj_buffer_allocate(this, size, CHECK_NULL);
+  assert(oop->mark().is_always_locked(), "Unlocked value type");
+  return oop;
+}
+
 bool ValueKlass::is_atomic() {
   return (nonstatic_field_size() * heapOopSize) <= longSize;
 }
 
 int ValueKlass::nonstatic_oop_count() {

@@ -151,11 +159,11 @@
   this->initialize(CHECK_NULL); // will throw an exception if in error state
   if (is_empty_value()) {
     res = (instanceOop)default_value();
   } else {
     Handle obj_h(THREAD, obj);
-    res = allocate_instance(CHECK_NULL);
+    res = allocate_instance_buffer(CHECK_NULL);
     value_copy_payload_to_new_oop(((char*)(oopDesc*)obj_h()) + offset, res);
   }
   assert(res != NULL, "Must be set in one of two paths above");
   return res;
 }