Fix global object check in %IsObserved and %SetIsObserved.

src/runtime.cc

 // 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 12809 matching lines @@
   return isolate->heap()->ToBoolean(obj1->map() == obj2->map());
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_IsObserved) {
   NoHandleAllocation ha(isolate);
   ASSERT(args.length() == 1);
   CONVERT_ARG_CHECKED(JSReceiver, obj, 0);
   if (obj->IsJSGlobalProxy()) {
     Object* proto = obj->GetPrototype();
-    if (obj->IsNull()) return isolate->heap()->false_value();
+    if (proto->IsNull()) return isolate->heap()->false_value();
     ASSERT(proto->IsJSGlobalObject());
     obj = JSReceiver::cast(proto);
   }
   return isolate->heap()->ToBoolean(obj->map()->is_observed());
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_SetIsObserved) {
   NoHandleAllocation ha(isolate);
   ASSERT(args.length() == 2);
   CONVERT_ARG_CHECKED(JSReceiver, obj, 0);
   CONVERT_BOOLEAN_ARG_CHECKED(is_observed, 1);
   if (obj->IsJSGlobalProxy()) {
     Object* proto = obj->GetPrototype();
-    if (obj->IsNull()) return isolate->heap()->undefined_value();
+    if (proto->IsNull()) return isolate->heap()->undefined_value();
     ASSERT(proto->IsJSGlobalObject());
     obj = JSReceiver::cast(proto);
   }
   ASSERT(!(obj->map()->is_observed() && obj->IsJSObject() &&
            JSObject::cast(obj)->HasFastElements()));
   if (obj->map()->is_observed() != is_observed) {
     if (is_observed && obj->IsJSObject() &&
         !JSObject::cast(obj)->HasExternalArrayElements()) {
       // Go to dictionary mode, so that we don't skip map checks.
       MaybeObject* maybe = JSObject::cast(obj)->NormalizeElements();
@@ skipping 130 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal