Zero-Overhead Exeption Handling Using Metaprogramming

We present a novel approach to exception handling which is based on metaprogramming. Our mechanism does not require language support, imposes no run time overhead to errorfree programs, and is easy to implement. Exception handlers are implemented as ordinary procedures. When an exception occurs, the corresponding handler is searched dynamically using the type of the exception as a search criterion. Our implementation was done in the Oberon System but it could be ported to most other systems that support metaprogramming.