プログラミング研究室

ICFP 2019 での発表

叢悠悠が関数型言語の国際会議 ICFP 2019 で以下の論文を発表します。

タイトル: Compiling with Continuations, or without? Whatever.

著者: Youyou Cong, Leo Osvald, Gregory Essertel, and Tiark Rompf

概要:

What makes a good compiler IR?  In the context of functional languages, there has been an extensive debate on the advantages and disadvantages of continuation-passing-style (CPS).  The consensus seems to be that some form of explicit continuations is necessary to model jumps in a functional style, but that they should have a 2nd-class status, separate from regular functions, to ensure efficient code generation.  Building on this observation, a recent study from PLDI 2017 proposed a direct-style IR with explicit join points, which essentially represent local continuations, i.e., functions that do not return or escape.  While this IR can work well in practice, as evidenced by the implementation of join points in the Glasgow Haskell Compiler (GHC), there still seems to be room for improvement, especially with regard to the way continuations are handled in the course of optimization.

In this paper, we contribute to the CPS debate by developing a novel IR with the following features.   First, we integrate a control operator that resembles Felleisen’s C, eliminating certain redundant rewrites observed in the previous study.  Second, we treat the non-returning and non-escaping aspects of continuations separately, allowing efficient compilation of well-behaved functions defined by the user.  Third, we define a selective CPS translation of our IR, which erases control operators while preserving the meaning and typing of programs.  These features enable optimizations in both direct style and full CPS, as well as in any intermediate style with selectively exposed continuations.  Thus, we change the spectrum of available options from “CPS yes or no” to “as much or as little CPS as you want, when you want it”.

Chengkai Yangによるサマープログラム成果発表

ジョージア工科大学からの交換留学生Chengkai Yangがサマープログラムの成果発表を行いました。Yangは当研究室においてプログラム合成を用いたCUDAプログラムの最適器ツールKaniCUDAの高速化に取り組みました。

• 最終発表ポスター

コンピュータソフトウェア誌に増原の巻頭言が掲載

日本ソフトウェア科学会「コンピュータソフトウェア」誌の2019年36巻3号に増原の巻頭言「お前まだアレやってるの?」が掲載されました。