Pretenure call new support.

src/heap.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 4385 matching lines @@
   return result;
 }
 
 
 MaybeObject* Heap::AllocateJSObjectWithAllocationSite(JSFunction* constructor,
     Handle<AllocationSite> allocation_site) {
   ASSERT(constructor->has_initial_map());
   // Allocate the object based on the constructors initial map, or the payload
   // advice
   Map* initial_map = constructor->initial_map();
+  AllocationSiteMode mode = TRACK_ALLOCATION_SITE;
 
-  ElementsKind to_kind = allocation_site->GetElementsKind();
-  AllocationSiteMode mode = TRACK_ALLOCATION_SITE;
-  if (to_kind != initial_map->elements_kind()) {
-    MaybeObject* maybe_new_map = initial_map->AsElementsKind(to_kind);
-    if (!maybe_new_map->To(&initial_map)) return maybe_new_map;
-    // Possibly alter the mode, since we found an updated elements kind
-    // in the type info cell.
-    mode = AllocationSite::GetMode(to_kind);
+  if (initial_map->instance_type() == JS_ARRAY_TYPE) {
+    ElementsKind to_kind = allocation_site->GetElementsKind();
+    if (to_kind != initial_map->elements_kind()) {
+      MaybeObject* maybe_new_map = initial_map->AsElementsKind(to_kind);
+      if (!maybe_new_map->To(&initial_map)) return maybe_new_map;
+      // Possibly alter the mode, since we found an updated elements kind
+      // in the type info cell.
+      mode = AllocationSite::GetMode(to_kind);
+    }
   }
 
   MaybeObject* result;
   if (mode == TRACK_ALLOCATION_SITE) {
     result = AllocateJSObjectFromMapWithAllocationSite(initial_map,
         allocation_site);
   } else {
     result = AllocateJSObjectFromMap(initial_map, NOT_TENURED);
   }
 #ifdef DEBUG
@@ skipping 3276 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   OS::MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   OS::MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 
 } }  // namespace v8::internal