A change in the way we place TransitionElementKinds in the tree.

src/objects.cc

 // Copyright 2012 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 2304 matching lines @@
         transitioned_map = maybe_transitioned_map;
         if (!IsFastPackedElementsKind(kind)) packed = false;
       }
       current_map = maybe_transitioned_map;
     }
   }
   return transitioned_map;
 }
 
 
-static Map* FindClosestElementsTransition(Map* map, ElementsKind to_kind) {
+Map* FindClosestElementsTransition(Map* map, ElementsKind to_kind) {
   Map* current_map = map;
   int index = GetSequenceIndexFromFastElementsKind(map->elements_kind());
   int to_index = IsFastElementsKind(to_kind)
       ? GetSequenceIndexFromFastElementsKind(to_kind)
       : GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
 
   ASSERT(index <= to_index);
 
   for (; index < to_index; ++index) {
     if (!current_map->HasElementsTransition()) return current_map;
@@ skipping 10 matching lines @@
 }
 
 
 Map* Map::LookupElementsTransitionMap(ElementsKind to_kind) {
   Map* to_map = FindClosestElementsTransition(this, to_kind);
   if (to_map->elements_kind() == to_kind) return to_map;
   return NULL;
 }
 
 
-static MaybeObject* AddMissingElementsTransitions(Map* map,
-                                                  ElementsKind to_kind) {
-  ASSERT(IsFastElementsKind(map->elements_kind()));
-  int index = GetSequenceIndexFromFastElementsKind(map->elements_kind());
+MaybeObject* Map::AddMissingElementsTransitions(ElementsKind to_kind) {
+  ASSERT(IsFastElementsKind(elements_kind()));
+  int index = GetSequenceIndexFromFastElementsKind(elements_kind());
   int to_index = IsFastElementsKind(to_kind)
       ? GetSequenceIndexFromFastElementsKind(to_kind)
       : GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
 
   ASSERT(index <= to_index);
 
-  Map* current_map = map;
+  Map* current_map = this;
 
   for (; index < to_index; ++index) {
     ElementsKind next_kind = GetFastElementsKindFromSequenceIndex(index + 1);
     MaybeObject* maybe_next_map =
         current_map->CopyAsElementsKind(next_kind, INSERT_TRANSITION);
     if (!maybe_next_map->To(&current_map)) return maybe_next_map;
   }
 
   // In case we are exiting the fast elements kind system, just add the map in
   // the end.
@@ skipping 43 matching lines @@
   if (!allow_store_transition) {
     return start_map->CopyAsElementsKind(to_kind, OMIT_TRANSITION);
   }
 
   Map* closest_map = FindClosestElementsTransition(start_map, to_kind);
 
   if (closest_map->elements_kind() == to_kind) {
     return closest_map;
   }
 
-  return AddMissingElementsTransitions(closest_map, to_kind);
+  return closest_map->AddMissingElementsTransitions(to_kind);
 }
 
 
 void JSObject::LocalLookupRealNamedProperty(String* name,
                                             LookupResult* result) {
   if (IsJSGlobalProxy()) {
     Object* proto = GetPrototype();
     if (proto->IsNull()) return result->NotFound();
     ASSERT(proto->IsJSGlobalObject());
     // A GlobalProxy's prototype should always be a proper JSObject.
@@ skipping 11427 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal