Lightweight Modular Staging: A Pragmatic Approach to Runtime Code Generation and Compiled DSLs

摘要

Software engineering demands generality and abstraction, performance demands specialization and concretization. Generative programming can provide both, but developing high-quality program generators takes a large effort, even if a multi-stage programming language is used. We present lightweight modular staging, a library-based multistage programming approach that breaks with the tradition of syntactic quasi-quotation and instead uses only types to distinguish between binding times. Through extensive use of component technology, lightweight modular staging makes an optimizing compiler framework available at the library level, allowing programmers to tightly integrate domain-specific abstractions and optimizations into the generation process. We argue that lightweight modular staging enables a form of language visualization, i.e. allows to go from a pure-library embedded language to one that is practically equivalent to a standalone implementation with only modest effort.