Support for global var shortcuts in script contexts.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 4c72aa9d6c5e60723e931762a8b20804fd6e30b2..198e501e6efaa2898ac8fbf6e55584104828ee16 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1802,9 +1802,21 @@ void JSObject::MigrateToMap(Handle<JSObject> object, Handle<Map> new_map,
         DCHECK(new_map->GetBackPointer()->IsUndefined());
       }
     } else {
+      DCHECK(!object->IsGlobalObject());
       MigrateFastToSlow(object, new_map, expected_additional_properties);
     }
   } else {
+    if (object->IsGlobalObject()) {

[Toon Verwaest, 2015/07/01 09:28:55]

What case is this needed for?
Add a comment at least.

[Igor Sheludko, 2015/07/02 16:50:13]

Done.

+      Handle<Context> native_context(
+          GlobalObject::cast(*object)->native_context());
+      Handle<ScriptContextTable> script_contexts(
+          native_context->script_context_table());
+      for (int i = 0; i < script_contexts->used(); i++) {
+        Handle<Context> context =
+            ScriptContextTable::GetContext(script_contexts, i);
+        context->InvalidateGlobalSlots();
+      }
+    }
     // For slow-to-fast migrations JSObject::MigrateSlowToFast()
     // must be used instead.
     CHECK(new_map->is_dictionary_map());