Support for global var shortcuts in script contexts.

src/runtime/runtime-scopes.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/frames-inl.h"
 #include "src/messages.h"
@@ skipping 614 matching lines @@
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
 
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
   CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 1);
   Handle<GlobalObject> global_object(function->context()->global_object());
   Handle<Context> native_context(global_object->native_context());
   Handle<ScriptContextTable> script_context_table(
       native_context->script_context_table());
 
-  Handle<String> clashed_name;
   Object* name_clash_result =
       FindNameClash(scope_info, global_object, script_context_table);
   if (isolate->has_pending_exception()) return name_clash_result;
 
   // Script contexts have a canonical empty function as their closure, not the
   // anonymous closure containing the global code.  See
   // FullCodeGenerator::PushFunctionArgumentForContextAllocation.
-  Handle<JSFunction> closure(native_context->closure());
+  Handle<JSFunction> closure(global_object->IsJSBuiltinsObject()
+                                 ? *function
+                                 : native_context->closure());
   Handle<Context> result =
       isolate->factory()->NewScriptContext(closure, scope_info);
 
+  result->InitializeGlobalSlots();
+
   DCHECK(function->context() == isolate->context());
-  DCHECK(function->context()->global_object() == result->global_object());
+  DCHECK(*global_object == result->global_object());
 
   Handle<ScriptContextTable> new_script_context_table =
       ScriptContextTable::Extend(script_context_table, result);
   native_context->set_script_context_table(*new_script_context_table);
   return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_NewFunctionContext) {
   HandleScope scope(isolate);
@@ skipping 470 matching lines @@
   return Smi::FromInt(frame->GetArgumentsLength());
 }
 
 
 RUNTIME_FUNCTION(Runtime_Arguments) {
   SealHandleScope shs(isolate);
   return __RT_impl_Runtime_GetArgumentsProperty(args, isolate);
 }
 }  // namespace internal
 }  // namespace v8