Use a wrapper for copying object.

src/objects.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5806 matching lines @@
   } else if (old_map->CanHaveMoreTransitions()) {
     new_map = Map::CopyForObserved(old_map);
   } else {
     new_map = Map::Copy(old_map);
     new_map->set_is_observed();
   }
   JSObject::MigrateToMap(object, new_map);
 }
 
 
+Handle<JSObject> JSObject::Copy(Handle<JSObject> object,
+                                Handle<AllocationSite> site) {
+  Isolate* isolate = object->GetIsolate();
+  CALL_HEAP_FUNCTION(isolate,
+                     isolate->heap()->CopyJSObject(
+                         *object,
+                         site.is_null() ? NULL : *site),
+                     JSObject);
+}
+
+
 Handle<JSObject> JSObject::Copy(Handle<JSObject> object) {
   Isolate* isolate = object->GetIsolate();
   CALL_HEAP_FUNCTION(isolate,
-                     isolate->heap()->CopyJSObject(*object), JSObject);
+                     isolate->heap()->CopyJSObject(*object, NULL),
+                     JSObject);
 }
 
 
 Handle<Object> JSObject::FastPropertyAt(Handle<JSObject> object,
                                         Representation representation,
                                         int index) {
   Isolate* isolate = object->GetIsolate();
   Handle<Object> raw_value(object->RawFastPropertyAt(index), isolate);
   return Object::NewStorageFor(isolate, raw_value, representation);
 }
@@ skipping 50 matching lines @@
   if (object->map()->is_deprecated()) {
     JSObject::MigrateInstance(object);
   }
 
   Handle<JSObject> copy;
   if (copying) {
     Handle<AllocationSite> site_to_pass;
     if (site_context()->ShouldCreateMemento(object)) {
       site_to_pass = site_context()->current();
     }
-    CALL_AND_RETRY_OR_DIE(isolate,
-                          isolate->heap()->CopyJSObject(*object,
-                              site_to_pass.is_null() ? NULL : *site_to_pass),
-                          { copy = Handle<JSObject>(JSObject::cast(__object__),
-                                                    isolate);
-                            break;
-                          },
-                          return Handle<JSObject>());
+    copy = JSObject::Copy(object, site_to_pass);
   } else {
     copy = object;
   }
 
   ASSERT(copying || copy.is_identical_to(object));
 
   ElementsKind kind = copy->GetElementsKind();
   if (copying && IsFastSmiOrObjectElementsKind(kind) &&
       FixedArray::cast(copy->elements())->map() ==
         isolate->heap()->fixed_cow_array_map()) {
@@ skipping 10675 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal