Writing a debugger for Eclipse

It's been said that the hardest, least well documented part of writing Eclipse plugins is writing a debugger for a new language (at least, a recent article in C/C++ User's Journal said so.) I now find myself in the unenviable position of writing one.
Just wondering if your book helps at all with this -- any juicy tidbits about writing debuggers? If not, or even as well, can you recommend other sources of info about debugger writing (other than the Star Wars injunction to "use the source?")
[ November 11, 2003: Message edited by: Ernest Friedman-Hill ]

I'm afraid we don't cover debugger writing. Perhaps Erich can point out some online sources of ideas.
Kent

yep - we don't cover integrating a debugger, all we do in the book is to provide some forward pointers to the Java debugger that is integrated in the Eclipse SDK.
Eventually there should be a an article with an example debugger integration. However, whenever we think we have an example for the article (e.g. integrate a ruby debugger), then someone else has already done it<g> So it cannot be that hard... see for example http://sourceforge.net/projects/rubyeclipse. This is an Eclipse ruby plug-in that contributes a debugger.
If you want to learn more about implementing debuggers then you might want to consider attending EclipseCon 2004 (www.eclipsecon.org). There will be a technology exchange on how to implement a debugger.
--erich

Thanks muchly, Erich, for both the EclipseCon info (sounds great, I should go!) and the rubyeclipse URL.