Merge 77597 - 2011-02-03 Anton Muhin <antonm@chromium.org>...

Source/WebCore/bindings/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. 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
@@ skipping 215 matching lines @@
 
             m_mode = DoNotExternalize;
             v8::TryCatch block;
             m_v8Object = m_v8Object->ToString();
             // Handle the case where an exception is thrown as part of invoking toString on the object.
             if (block.HasCaught()) {
                 block.ReThrow();
                 return false;
             }
 
+            // This path is unexpected.  However there is hypothesis that it
+            // might be combination of v8 and v8 bindings bugs.  For now
+            // just bailout as we'll crash if attempt to convert empty handle into a string.
+            if (m_v8Object.IsEmpty()) {
+                ASSERT_NOT_REACHED();
+                return false;
+            }
+
             return true;
         }
 
         v8::Local<v8::Value> object() { return m_v8Object; }
 
         void setString(String string)
         {
             m_string = string;
             m_v8Object.Clear(); // To signal that String is ready.
         }
@@ skipping 50 matching lines @@
             setString(String());
             return true;
         }
 
         return V8ParameterBase::prepareBase();
     }
 
 } // namespace WebCore
 
 #endif // V8Binding_h