Add just enough state changes from EXTERNAL (outside V8) to OTHER...

src/handles.cc

 // Copyright 2006-2008 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 290 matching lines @@
 }
 
 
 // Wrappers for scripts are kept alive and cached in weak global
 // handles referred from proxy objects held by the scripts as long as
 // they are used. When they are not used anymore, the garbage
 // collector will call the weak callback on the global handle
 // associated with the wrapper and get rid of both the wrapper and the
 // handle.
 static void ClearWrapperCache(Persistent<v8::Value> handle, void*) {
+#ifdef ENABLE_HEAP_PROTECTION
+  // Weak reference callbacks are called as if from outside V8.  We
+  // need to reeenter to unprotect the heap.
+  VMState state(OTHER);
+#endif
   Handle<Object> cache = Utils::OpenHandle(*handle);
   JSValue* wrapper = JSValue::cast(*cache);
   Proxy* proxy = Script::cast(wrapper->value())->wrapper();
   ASSERT(proxy->proxy() == reinterpret_cast<Address>(cache.location()));
   proxy->set_proxy(0);
   GlobalHandles::Destroy(cache.location());
   Counters::script_wrappers.Decrement();
 }
 
 
@@ skipping 353 matching lines @@
                Handle<Context> compile_context,
                Handle<Context> function_context) {
   Handle<FixedArray> arr = Factory::NewFixedArray(3);
   arr->set(0, Smi::FromInt(index));
   arr->set(1, *compile_context);  // Compile in this context
   arr->set(2, *function_context);  // Set function context to this
   fun->shared()->set_lazy_load_data(*arr);
 }
 
 } }  // namespace v8::internal