Use CopyElements for SetFastDoubleElementsCapacityAndLength

src/elements.h

 // 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 70 matching lines @@
   // EcmaScript 5.1 semantics.
   virtual MaybeObject* SetCapacityAndLength(JSArray* array,
                                             int capacity,
                                             int length) = 0;
 
   // Deletes an element in an object, returning a new elements backing store.
   virtual MaybeObject* Delete(JSObject* holder,
                               uint32_t key,
                               JSReceiver::DeleteMode mode) = 0;
 
+  // If kCopyToEnd is specified as the copy_size to CopyElements, it copies all
+  // of elements from source after source_start to the destination array.
+  static const int kCopyToEnd = -1;
+  // If kCopyToEndAndInitializeToHole is specified as the copy_size to
+  // CopyElements, it copies all of elements from source after source_start to
+  // destination array, padding any remaining uninitialized elements in the
+  // destination array with the hole.
+  static const int kCopyToEndAndInitializeToHole = -2;
+
   // Copy elements from one backing store to another. Typically, callers specify
   // the source JSObject or JSArray in source_holder. If the holder's backing
   // store is available, it can be passed in source and source_holder is
   // ignored.
   virtual MaybeObject* CopyElements(JSObject* source_holder,
                                     uint32_t source_start,
                                     FixedArrayBase* destination,
                                     ElementsKind destination_kind,
                                     uint32_t destination_start,
                                     int copy_size,
+                                    WriteBarrierMode mode,
                                     FixedArrayBase* source = NULL) = 0;
 
   MaybeObject* CopyElements(JSObject* from_holder,
                             FixedArrayBase* to,
                             ElementsKind to_kind,
+                            WriteBarrierMode mode,
                             FixedArrayBase* from = NULL) {
-    return CopyElements(from_holder, 0, to, to_kind, 0, -1, from);
+    return CopyElements(from_holder, 0, to, to_kind, 0,
+                        kCopyToEndAndInitializeToHole, mode, from);
   }
 
   virtual MaybeObject* AddElementsToFixedArray(Object* receiver,
                                                JSObject* holder,
                                                FixedArray* to,
                                                FixedArrayBase* from = NULL) = 0;
 
   // Returns a shared ElementsAccessor for the specified ElementsKind.
   static ElementsAccessor* ForKind(ElementsKind elements_kind) {
     ASSERT(elements_kind < kElementsKindCount);
@@ skipping 21 matching lines @@
                                   uint32_t index) = 0;
 
  private:
   static ElementsAccessor** elements_accessors_;
   const char* name_;
 
   DISALLOW_COPY_AND_ASSIGN(ElementsAccessor);
 };
 
 
-void CopyObjectToObjectElements(AssertNoAllocation* no_gc,
-                                FixedArray* from_obj,
+void CopyObjectToObjectElements(FixedArray* from_obj,
                                 ElementsKind from_kind,
                                 uint32_t from_start,
                                 FixedArray* to_obj,
                                 ElementsKind to_kind,
                                 uint32_t to_start,
-                                int copy_size);
+                                int copy_size,
+                                WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ELEMENTS_H_