Fixing exception reporting so that a verbose TryCatch handler works again.

src/top.h

 // 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 28 matching lines @@
 // Top has static variables used for JavaScript execution.
 
 class SaveContext;  // Forward decleration.
 
 class ThreadLocalTop BASE_EMBEDDED {
  public:
   // The context where the current execution method is created and for variable
   // lookups.
   Context* context_;
   Object* pending_exception_;
+  bool has_pending_message_;
   const char* pending_message_;
   Object* pending_message_obj_;
   Script* pending_message_script_;
   int pending_message_start_pos_;
   int pending_message_end_pos_;
   // Use a separate value for scheduled exceptions to preserve the
   // invariants that hold about pending_exception.  We may want to
   // unify them later.
   Object* scheduled_exception_;
   bool external_caught_exception_;
@@ skipping 61 matching lines @@
   }
 
   static Object** pending_exception_address() {
     return &thread_local_.pending_exception_;
   }
   static bool has_pending_exception() {
     return !thread_local_.pending_exception_->IsTheHole();
   }
   static void clear_pending_message() {
     thread_local_.catcher_ = NULL;
+    thread_local_.has_pending_message_ = false;
     thread_local_.pending_message_ = NULL;
     thread_local_.pending_message_obj_ = Heap::the_hole_value();
     thread_local_.pending_message_script_ = NULL;
   }
   static v8::TryCatch* try_catch_handler() {
     return thread_local_.try_catch_handler_;
   }
   // This method is called by the api after operations that may throw
   // exceptions.  If an exception was thrown and not handled by an external
   // handler the exception is scheduled to be rethrown when we return to running
@@ skipping 239 matching lines @@
 
 class ExecutionAccess BASE_EMBEDDED {
  public:
   ExecutionAccess();
   ~ExecutionAccess();
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TOP_H_