A Self-Applicable Supercompiler

A supercompiler is a program which can perform a deep transformation of programs using a principle which is similar to partial evaluation, and can be referred to as metacomputation. Supercompilers that have been in existence up to now (see [12], [13]) were not self-applicable: this is a more difficult problem than self-application of a partial evaluator, because of the more intricate logic of supercompilation. In the present paper we describe the first self-applicable model of a supercompiler and present some tests. Three features distinguish it from the previous models and make self-application possible: (1) The input language is a subset of Refal which we refer to as flat Refal. (2) The process of driving is performed as a transformation of pattern-matching graphs. (3) Metasystem jumps are implemented, which allows the supercompiler to avoid interpretation whenever direct computation is possible