Move SetFastDoubleElementsCapacity into GrowCapacityAndConvert

src/lookup.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/bootstrapper.h"
 #include "src/deoptimizer.h"
 #include "src/lookup.h"
 #include "src/lookup-inl.h"
@@ skipping 103 matching lines @@
 
   if (IsElement()) {
     ElementsKind old_kind = holder_map_->elements_kind();
     holder_map_ = Map::PrepareForDataElement(holder_map_, value);
     ElementsKind new_kind = holder_map_->elements_kind();
     if (new_kind != old_kind) {
       // TODO(verwaest): Handle element migration in MigrateToMap.
       JSObject::UpdateAllocationSite(holder, new_kind);
       if (IsFastDoubleElementsKind(old_kind) !=
           IsFastDoubleElementsKind(new_kind)) {
-        Handle<FixedArrayBase> old_elements(holder->elements());
-        int capacity = old_elements->length();
-        Handle<FixedArrayBase> new_elements;
-        if (IsFastDoubleElementsKind(new_kind)) {
-          new_elements = factory()->NewFixedDoubleArray(capacity);
-        } else {
-          new_elements = factory()->NewFixedArray(capacity);
-        }
-
+        uint32_t capacity = holder->elements()->length();
         ElementsAccessor* accessor = ElementsAccessor::ForKind(new_kind);
-        accessor->CopyElements(holder, new_elements, old_kind);
-
-        JSObject::ValidateElements(holder);
-        JSObject::SetMapAndElements(holder, holder_map_, new_elements);
-
-        if (FLAG_trace_elements_transitions) {
-          JSObject::PrintElementsTransition(
-              stdout, holder, old_kind, old_elements, new_kind, new_elements);
-        }
-        // SetMapAndElements above migrated the object. No reloading of property
+        accessor->GrowCapacityAndConvert(holder, capacity);
+        // GrowCapacityAndConvert migrated the object. No reloading of property
         // infomation is necessary for elements.
         return;
       } else if (FLAG_trace_elements_transitions) {
         Handle<FixedArrayBase> elements(holder->elements());
         JSObject::PrintElementsTransition(stdout, holder, old_kind, elements,
                                           new_kind, elements);
       }
     }
 
     // Copy the backing store if it is copy-on-write.
@@ skipping 344 matching lines @@
       case InterceptorState::kSkipNonMasking:
         return true;
       case InterceptorState::kProcessNonMasking:
         return false;
     }
   }
   return interceptor_state_ == InterceptorState::kProcessNonMasking;
 }
 }  // namespace internal
 }  // namespace v8