This repository contains an in-progress port of the original Lightweight Modular Staging (LMS) library to Scala 3.

Lightweight Modular Staging (LMS) is a runtime code generation approach. This framework, LMS-Core, provides a library of core components for building high performance code generators and embedded compilers in Scala.

The original LMS source can be found here.

Progress:

Most core functionality has been successfully ported, and basic code generation works as expected.

Missing features:

• Reification of complex data types
• In-process execution of staged code (eval and friends)
• Non-Scala backends

Bugs:

• Types with nested type parameters are buggy
• Writing overly-generic code is difficult-to-impossible due to changes to Scala 3's reflection semantics

Limitations:

• Staged mutable variables (e.g., something that should be mutated in the generated code) must be type-annotated, e.g.

  var x: Var[Int] = 1
  

  This is due to changes to how Scala 3 handles macros.

Background:

• LMS website

• LMS paper

How to build:

1. Install the SBT build tool.

2. Run sbt test to run the test suite.

3. Run sbt publish-local to install LMS-Core for use in other projects.

License:

Copyright 2010-2016, EPFL and collaborators. Licensed under the revised BSD License.