Inline fast case of the method that ensures that an array has a

src/objects.cc

 // Copyright 2006-2009 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 4959 matching lines @@
   } else {
     Object* obj = Heap::AllocateFixedArrayWithHoles(capacity);
     if (obj->IsFailure()) return obj;
     new_elements = FixedArray::cast(obj);
   }
   set_elements(new_elements);
   return this;
 }
 
 
-void JSArray::EnsureSize(int required_size) {
+void JSArray::Expand(int required_size) {
   Handle<JSArray> self(this);
-  ASSERT(HasFastElements());
-  if (elements()->length() >= required_size) return;
   Handle<FixedArray> old_backing(elements());
   int old_size = old_backing->length();
   // Doubling in size would be overkill, but leave some slack to avoid
   // constantly growing.
   int new_size = required_size + (required_size >> 3);
   Handle<FixedArray> new_backing = Factory::NewFixedArray(new_size);
   // Can't use this any more now because we may have had a GC!
   for (int i = 0; i < old_size; i++) new_backing->set(i, old_backing->get(i));
   self->SetContent(*new_backing);
 }
@@ skipping 2485 matching lines @@
   // No break point.
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 } }  // namespace v8::internal