Synbit: synthesizing bidirectional programs using unidirectional sketches

Author:

Yamaguchi Masaomi,Matsuda Kazutaka,David CristinaORCID,Wang Meng

Abstract

AbstractWe propose a technique for synthesizing bidirectional programs from the corresponding unidirectional code plus input/output examples. The core ideas are: (1) constructing a sketch using the given unidirectional program as a specification, and (2) filling the sketch in a modular fashion by exploiting the properties of bidirectional programs. These ideas are enabled by our choice of programming language, HOBiT, which is specifically designed to maintain the unidirectional program structure in bidirectional programming, and keep the parts that control bidirectional behavior modular. To evaluate our approach, we implemented it in a tool called Synbit and used it to generate bidirectional programs for intricate microbenchmarks, as well as for a few larger, more realistic problems. We also compared Synbit to a state-of-the-art unidirectional synthesis tool on the task of synthesizing backward computations. This is an extended version of the paper “Synbit: Synthesizing Bidirectional Programs using Unidirectional Sketches”, published at OOPSLA 2021. In addition to the OOPSLA’21 paper, this journal will contain additional formalization and detailed examples.

Funder

Royal Society

EPSRC

JSPS KAKENHI

JSPS Bilateral Program

Kayamori Foundation of Informational Science Advancement

Publisher

Springer Science and Business Media LLC

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