Implemented really weak handles.

src/api.cc

 // Copyright 2009 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 354 matching lines @@
 }
 
 
 void V8::MakeWeak(i::Object** object, void* parameters,
                   WeakReferenceCallback callback) {
   LOG_API("MakeWeak");
   i::GlobalHandles::MakeWeak(object, parameters, callback);
 }
 
 
+void V8::MakeReallyWeak(i::Object** object, void* parameters,
+                        WeakReferenceCallback callback) {
+  LOG_API("MakeReallyWeak");
+  i::GlobalHandles::MakeReallyWeak(object, parameters, callback);
+}
+
+
 void V8::ClearWeak(i::Object** obj) {
   LOG_API("ClearWeak");
   i::GlobalHandles::ClearWeakness(obj);
 }
 
 
 bool V8::IsGlobalNearDeath(i::Object** obj) {
   LOG_API("IsGlobalNearDeath");
   if (!i::V8::IsRunning()) return false;
   return i::GlobalHandles::IsNearDeath(obj);
 }
 
 
 bool V8::IsGlobalWeak(i::Object** obj) {
   LOG_API("IsGlobalWeak");
   if (!i::V8::IsRunning()) return false;
   return i::GlobalHandles::IsWeak(obj);
 }
 
 
 void V8::DisposeGlobal(i::Object** obj) {
   LOG_API("DisposeGlobal");
   if (!i::V8::IsRunning()) return;
-  if ((*obj)->IsGlobalContext()) i::Heap::NotifyContextDisposed();
+  if (!i::GlobalHandles::IsReallyWeak(obj) && (*obj)->IsGlobalContext()) {
+    i::Heap::NotifyContextDisposed();
+  }
   i::GlobalHandles::Destroy(obj);
 }
 
 // --- H a n d l e s ---
 
 
 HandleScope::HandleScope() : is_closed_(false) {
   API_ENTRY_CHECK("HandleScope::HandleScope");
   i::HandleScope::Enter(&previous_);
 }
@@ skipping 3357 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal