A Minimalist's Reversible While Language

Robert GLÜCK  Tetsuo YOKOYAMA  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E100-D   No.5   pp.1026-1034
Publication Date: 2017/05/01
Online ISSN: 1745-1361
Type of Manuscript: PAPER
Category: Software System
Keyword: 
reversible programming language,  reversible self-interpreter,  while language,  translation,  program inversion,  

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Summary: 
The paper presents a small reversible language R-CORE, a structured imperative programming language with symbolic tree-structured data (S-expressions). The language is reduced to the core of a reversible language, with a single command for reversibly updating the store, a single reversible control-flow operator, a limited number of variables, and data with a single atom and a single constructor. Despite its extreme simplicity, the language is reversibly universal, which means that it is as powerful as any reversible language can be, while it is linear-time self-interpretable, and it allows reversible programming with dynamic data structures. The four-line program inverter for R-CORE is among the shortest existing program inverters, which demonstrates the conciseness of the language. The translator to R-CORE, which is used to show the formal properties of the language, is clean and modular, and it may serve as a model for related reversible translation problems. The goal is to provide a language that is sufficiently concise for theoretical investigations. Owing to its simplicity, the language may also be used for educational purposes.