503   Object* last = result->IsProperty() ? result->holder() : heap->null_value();  in GetProperty()
615     return heap->null_value();  in GetPrototype()
1812        pt != heap->null_value();  in LookupCallbackSetterInPrototypes()
1830        pt != heap->null_value();  in SetElementWithCallbackSetterInPrototypes()
2013        pt != heap->null_value();  in LookupRealNamedPropertyInPrototypes()
3084        o != heap->null_value();  in IsSimpleEnum()
3186        current != heap->null_value();  in Lookup()
3199        current != heap->null_value();  in LookupCallback()
3517          obj != heap->null_value();  in LookupAccessor()
3536          obj != heap->null_value();  in LookupAccessor()
4052   set(EntryToIndex(index), heap->null_value());  in RemoveByIndex()
4053   set(EntryToIndex(index) + 1, heap->null_value());  in RemoveByIndex()
4103   return GetHeap()->null_value();  // Failure case needs to "return" a value.  in AddKeysFromJSArray()
5921        obj != heap->null_value();  in CanGenerateInlineConstructor()
6974   for (Object* pt = value; pt != heap->null_value(); pt = pt->GetPrototype()) {  in SetPrototype()
7651   return isolate->heap()->null_value();  in SetElementWithoutInterceptor()
7822   if (pt == heap->null_value()) return heap->undefined_value();  in GetElementWithReceiver()
8178   return GetHeap()->null_value();  in HasRealElementProperty()
9599   Object* null_value = GetHeap()->null_value();  in Remove()  local
9604       fast_set(this, entry_index, null_value);  in Remove()
9605       fast_set(this, value_index, null_value);  in Remove()
9764   Object* sentinel = heap->null_value();  in RemoveNumberEntries()
9791   SetEntry(entry, heap->null_value(), heap->null_value());  in DeleteProperty()