Support Smi->Double->HeapObject transitions in constructed Arrays.

src/factory.cc

 // Copyright 2011 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 908 matching lines @@
 
 Handle<JSArray> Factory::NewJSArray(int capacity,
                                     PretenureFlag pretenure) {
   Handle<JSObject> obj = NewJSObject(isolate()->array_function(), pretenure);
   CALL_HEAP_FUNCTION(isolate(),
                      Handle<JSArray>::cast(obj)->Initialize(capacity),
                      JSArray);
 }
 
 
-Handle<JSArray> Factory::NewJSArrayWithElements(Handle<FixedArray> elements,
+Handle<JSArray> Factory::NewJSArrayWithElements(Handle<FixedArrayBase> elements,
                                                 PretenureFlag pretenure) {
   Handle<JSArray> result =
       Handle<JSArray>::cast(NewJSObject(isolate()->array_function(),
                                         pretenure));
+  result->set_length(Smi::FromInt(0));
   SetContent(result, elements);
   return result;
 }
 
 
 void Factory::SetContent(Handle<JSArray> array,
-                         Handle<FixedArray> elements) {
+                         Handle<FixedArrayBase> elements) {
   CALL_HEAP_FUNCTION_VOID(
       isolate(),
       array->SetContent(*elements));
 }
 
 
-void Factory::EnsureCanContainNonSmiElements(Handle<JSArray> array) {
+void Factory::EnsureCanContainHeapObjectElements(Handle<JSArray> array) {
   CALL_HEAP_FUNCTION_VOID(
       isolate(),
-      array->EnsureCanContainNonSmiElements());
+      array->EnsureCanContainHeapObjectElements());
 }
 
 
+void Factory::EnsureCanContainElements(Handle<JSArray> array,
+                                       Handle<FixedArrayBase> elements,
+                                       EnsureElementsMode mode) {
+  CALL_HEAP_FUNCTION_VOID(
+      isolate(),
+      array->EnsureCanContainElements(*elements, mode));
+}
+
+
 Handle<JSProxy> Factory::NewJSProxy(Handle<Object> handler,
                                     Handle<Object> prototype) {
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateJSProxy(*handler, *prototype),
       JSProxy);
 }
 
 
 void Factory::BecomeJSObject(Handle<JSReceiver> object) {
@@ skipping 397 matching lines @@
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return Handle<Object>(value
                         ? isolate()->heap()->true_value()
                         : isolate()->heap()->false_value());
 }
 
 
 } }  // namespace v8::internal