Push an exception handler in this.
Whenever a JavaScript exception happens in the Context, the given handler will
be called. The default ExceptionHandler simply calls
throw_exception to throw the exception to the
Context. If you don't want to catch the exception, but only get notified about it, call
throw_exception in handler like the default one does. The last
exception handler pushed is the only one used by the Context, use
pop_exception_handler to remove it and set the previous one. When
handler is removed from the context, destroy_notify i called with user_data as parameter.
| this |
a Context |
| handler | |
| destroy_notify |
destroy notifier for |
| user_data |
user data to pass to |