On Aug 19, 2012, at 10:40 , Heinrich Apfelmus <apfel...@quantentunnel.de> wrote:
> Doaitse Swierstra wrote: >> Over the years we have been constructing a collection of Embedded >> Domain Specific Languages for describing compilers which are >> assembled from fragments which can be compiled individually. In this >> way one can gradually ``grow a language'' in a large number of small >> steps. The technique replaces things like macro extensions or >> Template Haskell; it has become feasible to just extend the language >> at hand by providing extra modules. The nice thing is that existing >> code does not have to be adapted, nor has to be available nor has to >> be recompiled. >> Recently we have been using (and adapting) the frameworks such that >> we could create an entry in the ldta11 (http://ldta.info/tool.html) >> tool challenge, where one has to show how one's tools can be used to >> create a compiler for the Oberon0 language, which is used a a running >> example in Wirth's compiler construction book. >> We have uploaded our implementation to hackage at: >> http://hackage.haskell.org/package/oberon0. >> More information can be found at the wiki: >> http://www.cs.uu.nl/wiki/bin/view/Center/CoCoCo >> You may take a look at the various Gram modules to see how syntax is >> being defined, and at the various Sem modules to see how we use our >> first class attribute grammars to implement the static semantics >> associated with the various tasks of the challenge. >> We hope you like it, and comments are welcome, > > Awesome! > > I have a small question: Last I remember, you've mainly been using your UUAGC > preprocessor to write attribute grammars in Haskell, especially for UHC. Now > that you have first-class attribute grammars in Haskell ("achievement > unlocked"), what do you intend to do with the preprocessor? How do these two > approaches compare at the moment and where would you like to take them? > > > Best regards, > Heinrich Apfelmus On the page http://www.cs.uu.nl/wiki/bin/view/Center/CoCoCo there is a link (http://www.fing.edu.uy/~mviera/papers/VSM12.pdf) to a paper we presented at LDTA (one of the ETAPS events) this spring. It explains how UUAGC can be used to generate first class compiler modules. We have also a facility for grouping attributes, so one can trade flexibility for speed. The first class approach stores list of attributes as nested cartesian products, access to which a clever compiler might be able to optimize. This however would correspond a form of specialisation, so you can hardly say that we have really independent modules; as always global optimisation is never compositional). From the point of view of the first class approach such grouped non-termionals are seen as a single composite non-terminal. Doaitse > > -- > http://apfelmus.nfshost.com > > > _______________________________________________ > Haskell mailing list > Haskell@haskell.org > http://www.haskell.org/mailman/listinfo/haskell _______________________________________________ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell
