Move CopyElements to the accessor of the target.

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 9288 matching lines @@
       new_elements_kind = FAST_SMI_ELEMENTS;
     }
   } else {
     if (IsHoleyElementsKind(elements_kind)) {
       new_elements_kind = FAST_HOLEY_ELEMENTS;
     } else {
       new_elements_kind = FAST_ELEMENTS;
     }
   }
   FixedArrayBase* old_elements = elements();
-  ElementsAccessor* accessor = ElementsAccessor::ForKind(elements_kind);
+  ElementsAccessor* accessor = ElementsAccessor::ForKind(new_elements_kind);
   MaybeObject* maybe_obj =
-      accessor->CopyElements(this, new_elements, new_elements_kind);
+      accessor->CopyElements(this, new_elements, elements_kind);
   if (maybe_obj->IsFailure()) return maybe_obj;
 
   if (elements_kind != NON_STRICT_ARGUMENTS_ELEMENTS) {
     Map* new_map = map();
     if (new_elements_kind != elements_kind) {
       MaybeObject* maybe =
           GetElementsTransitionMap(GetIsolate(), new_elements_kind);
       if (!maybe->To(&new_map)) return maybe;
     }
     ValidateElements();
@@ skipping 36 matching lines @@
     new_elements_kind = FAST_DOUBLE_ELEMENTS;
   }
 
   Map* new_map;
   { MaybeObject* maybe_obj =
         GetElementsTransitionMap(heap->isolate(), new_elements_kind);
     if (!maybe_obj->To(&new_map)) return maybe_obj;
   }
 
   FixedArrayBase* old_elements = elements();
-  ElementsAccessor* accessor = ElementsAccessor::ForKind(elements_kind);
+  ElementsAccessor* accessor = ElementsAccessor::ForKind(FAST_DOUBLE_ELEMENTS);
   { MaybeObject* maybe_obj =
-        accessor->CopyElements(this, elems, FAST_DOUBLE_ELEMENTS);
+        accessor->CopyElements(this, elems, elements_kind);
     if (maybe_obj->IsFailure()) return maybe_obj;
   }
   if (elements_kind != NON_STRICT_ARGUMENTS_ELEMENTS) {
     ValidateElements();
     set_map_and_elements(new_map, elems);
   } else {
     FixedArray* parameter_map = FixedArray::cast(old_elements);
     parameter_map->set(1, elems);
   }
 
@@ skipping 4502 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