External string table.

src/global-handles.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 150 matching lines @@
 
     v8::Persistent<v8::Object> object = ToApi<v8::Object>(handle());
     {
       // Forbid reuse of destroyed nodes as they might be already deallocated.
       // It's fine though to reuse nodes that were destroyed in weak callback
       // as those cannot be deallocated until we are back from the callback.
       set_first_free(NULL);
       if (first_deallocated()) {
         first_deallocated()->set_next(head());
       }
+      // Check that we are not passing a finalized external string to
+      // the callback.
+      ASSERT(!object_->IsExternalAsciiString() ||
+             ExternalAsciiString::cast(object_)->resource() != NULL);
+      ASSERT(!object_->IsExternalTwoByteString() ||
+             ExternalTwoByteString::cast(object_)->resource() != NULL);
       // Leaving V8.
       VMState state(EXTERNAL);
       func(object, par);
     }
     return true;
   }
 
   // Place the handle address first to avoid offset computation.
   Object* object_;  // Storage for object pointer.
 
@@ skipping 319 matching lines @@
 
 
 void GlobalHandles::RemoveObjectGroups() {
   List<ObjectGroup*>* object_groups = ObjectGroups();
   for (int i = 0; i< object_groups->length(); i++) {
     delete object_groups->at(i);
   }
   object_groups->Clear();
 }
 
-
 } }  // namespace v8::internal