Fixed global object leak

src/v8natives.js

 // 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 152 matching lines @@
 function GlobalParseFloat(string) {
   string = TO_STRING_INLINE(string);
   if (%_HasCachedArrayIndex(string)) return %_GetCachedArrayIndex(string);
   return %StringParseFloat(string);
 }
 
 
 function GlobalEval(x) {
   if (!IS_STRING(x)) return x;
 
-  var global_receiver = %GlobalReceiver(global);
-  var global_is_detached = (global === global_receiver);
-
   // For consistency with JSC we require the global object passed to
   // eval to be the global object from which 'eval' originated. This
   // is not mandated by the spec.
   // We only throw if the global has been detached, since we need the
   // receiver as this-value for the call.
-  if (global_is_detached) {
+  if (!%IsAttachedGlobal(global)) {
     throw new $EvalError('The "this" value passed to eval must ' +
                          'be the global object from which eval originated');
   }
 
+  var global_receiver = %GlobalReceiver(global);
+
   var f = %CompileString(x, false);
   if (!IS_FUNCTION(f)) return f;
 
   return %_CallFunction(global_receiver, f);
 }
 
 
 // ----------------------------------------------------------------------------
 
 // Set up global object.
@@ skipping 1649 matching lines @@
 // Eventually, we should move to a real event queue that allows to maintain
 // relative ordering of different kinds of tasks.
 
 RunMicrotasks.runners = new InternalArray;
 
 function RunMicrotasks() {
   while (%SetMicrotaskPending(false)) {
     for (var i in RunMicrotasks.runners) RunMicrotasks.runners[i]();
   }
 }