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The Disciplined Disciple Compiler (DDC)

DDC is a research compiler used to investigate program transformation in the presence of computational effects. It compiles a family of strict functional core languages and supports region, effect and closure typing. This extra information provides a handle on the operational behaviour of code that isn't available in other languages. Programs can be written in either a pure/functional or effectful/imperative style, and one of our goals is to provide both styles coherently in the same language.

State of Play

DDC is at a stage where it will compile first order programs to executables, and parse and type check-higher order programs. Back-end support for higher functions isn't finished, and we don't have a garbage collector yet. See the Release Notes for a summary of what works.

Example code:

Main changes to the repository over the last month or so:

  • 10/2/2014: DDC now includes a bi-directional type inferencer that reconstructs type abstractions and applications. We're currently fixing bugs in preparation for the 0.4 release.

Current Release

The current release is DDC 0.3.2 (July 2013). Release Notes.

DDC consists of the following packages. To get them all just install ddc-tools, and the others will be installed as dependencies.

  • ddc-tools Command line tools. This is the user interface for the other packages.
  • ddc-core Defines the abstract syntax, type checker, and substitution operators.
  • ddc-core-tetra Core language fragment using computation types instead of latent effects.
  • ddc-core-eval Provides a single step evaluator (interpreter). It is a direct implementation of the operational semantics.
  • ddc-core-salt Intermediate representation for C like languages, and C code generator.
  • ddc-base Re-exports the main external dependencies of the Disciplined Disciple Compiler project.

Tutorials

Language

Development

GitHub page: https://github.com/DDCSF/ddc

How to get help

How you can help

  • Download the compiler, do the tutorial, write programs.
  • File bug reports, fix tickets on the trac.
  • Complain if you can't work something out.

Further Reading