Skip access checks for hidden properties.

Hidden properties are used like internal fields which do not have
access checks. The checks can cause problems because there may be no
current context. See http://crbug.com/24200.

Review URL: http://codereview.chromium.org/271080

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3062 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/top.cc

@@ -494,11 +494,17 @@ static MayAccessDecision MayAccessPreCheck(JSObject* receiver,
 
 bool Top::MayNamedAccess(JSObject* receiver, Object* key, v8::AccessType type) {
   ASSERT(receiver->IsAccessCheckNeeded());
+
+  // The callers of this method are not expecting a GC.
+  AssertNoAllocation no_gc;
+
+  // Skip checks for hidden properties access.  Note, we do not
+  // require existence of a context in this case.
+  if (key == Heap::hidden_symbol()) return true;
+
   // Check for compatibility between the security tokens in the
   // current lexical context and the accessed object.
   ASSERT(Top::context());
-  // The callers of this method are not expecting a GC.
-  AssertNoAllocation no_gc;
 
   MayAccessDecision decision = MayAccessPreCheck(receiver, type);
   if (decision != UNKNOWN) return decision == YES;