Introduce an abstraction to write to a field.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index f4d2fc892d205f7aa920e0da61be3dc49a2f8a91..d0d67357a45dfd23fbc6e88548a832cd7db0fe43 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2614,6 +2614,7 @@ class JSObject: public JSReceiver {
                                        int index);
   inline Object* RawFastPropertyAt(int index);
   inline void FastPropertyAtPut(int index, Object* value);
+  void WriteToField(int descriptor, Object* value);
 
   // Access to in object properties.
   inline int GetInObjectPropertyOffset(int index);
@@ -2902,6 +2903,11 @@ class JSObject: public JSReceiver {
                               ValueType value_type,
                               TransitionFlag flag);
 
+  static void MigrateToNewProperty(Handle<JSObject> object,
+                                   Handle<Map> transition,
+                                   Handle<Object> value);
+
+

[Igor Sheludko, 2014/04/16 09:50:03]

Extra empty line?

   // Add a property to a slow-case object.
   static void AddSlowProperty(Handle<JSObject> object,
                               Handle<Name> name,