The deferred handes list belongs to the Isolate and not to the

src/isolate.h

 // 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 1037 matching lines @@
     return date_cache_;
   }
 
   void set_date_cache(DateCache* date_cache) {
     if (date_cache != date_cache_) {
       delete date_cache_;
     }
     date_cache_ = date_cache;
   }
 
+  void IterateDeferredHandles(ObjectVisitor* visitor);
+
  private:
   Isolate();
 
   friend struct GlobalState;
   friend struct InitializeGlobalState;
 
   enum State {
     UNINITIALIZED,    // Some components may not have been allocated.
     INITIALIZED       // All components are fully initialized.
   };
@@ skipping 98 matching lines @@
   void FillCache();
 
   void PropagatePendingExceptionToExternalTryCatch();
 
   void InitializeDebugger();
 
   // Traverse prototype chain to find out whether the object is derived from
   // the Error object.
   bool IsErrorObject(Handle<Object> obj);
 
+  void DestroyDeferredHandles(DeferredHandles* deferred);
+
   EntryStackItem* entry_stack_;
   int stack_trace_nesting_level_;
   StringStream* incomplete_message_;
   // The preallocated memory thread singleton.
   PreallocatedMemoryThread* preallocated_memory_thread_;
   Address isolate_addresses_[kIsolateAddressCount + 1];  // NOLINT
   NoAllocationStringAllocator* preallocated_message_space_;
   Bootstrapper* bootstrapper_;
   RuntimeProfiler* runtime_profiler_;
   CompilationCache* compilation_cache_;
@@ skipping 85 matching lines @@
   // This class is huge and has a number of fields controlled by
   // preprocessor defines. Make sure the offsets of these fields agree
   // between compilation units.
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                              \
   static const intptr_t name##_debug_offset_;
   ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
   ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
+  DeferredHandles* deferred_handles_head_;
+
+  friend class DeferredHandles;

[danno, 2012/07/18 13:36:17]

No friend in this direction.

[sanjoy, 2012/07/18 14:00:44]

Done.

   friend class ExecutionAccess;
   friend class IsolateInitializer;
   friend class ThreadManager;
   friend class Simulator;
   friend class StackGuard;
   friend class ThreadId;
   friend class TestMemoryAllocatorScope;
   friend class v8::Isolate;
   friend class v8::Locker;
   friend class v8::Unlocker;
@@ skipping 137 matching lines @@
 
 // Mark the global context with out of memory.
 inline void Context::mark_out_of_memory() {
   global_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_