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A tiny self-hosting Lisp-to-C compiler

branch: master
README
ICHBINS

This is a self-hosting compiler of a Lisp dialect to C in 6 pages of
code. I've tried to make it as simple as possible, with almost no
concessions to performance or extra functionality -- it's meant to be
educational rather than useful.


QUICK START

    $ git clone git@github.com:darius/ichbins.git
(Or get a tarball from http://github.com/darius/ichbins)
    $ cd ichbins
    $ make

To compile a program named foo.scm and then run it:
    $ ./ichbins <foo.scm >foo.c
    $ cc foo.c -o foo
    $ ./foo

There's a sketchy overview of the language and system in Overview.text.

To make a change to the compiler and rebuild it, just typing 'make'
isn't sufficient because of the circular dependency. 'make' will build
an executable named ichbins2, compiling the current source with the
previous executable. To replace that executable, type './bless', which
does two tests:

    * That the tests in the tests/ directory pass.

    * That the old and new versions of the compiler executable produce
      the same C output from the compiler source. This test typically
      passes for routine changes to the source, but it's perfectly OK
      for it to fail; you should just be sure you can say why this case
      is expected. Then do 'mv ichbins2 ichbins' by hand and do ./bless 
      again; this time it must pass, or something's buggered.

The Lisp dialect implemented here is undocumented, but there's also a
quick-and-dirty interpreter for it in C in boot-terp/. (I don't know if
it can still interpret the compiler by now.)


MOTIVATION

I'm a nut who wants to grow a beautiful wholeness from tiny beginnings.
This is a rewrite of 'icbins', which had the same larger goal in mind
but a more immediate focus on playing with bootstrapping.

Direct influences include:

Steele & Sussman, "The Art of the Interpreter"
http://library.readscheme.org/page1.html

Marc Feeley, "Scheme in 90 Minutes"
http://www.iro.umontreal.ca/~boucherd/mslug/meetings/20041020/minutes-en.html
(which compiles a more powerful Scheme subset, but is longer and not
self-hosting)

The name 'ichbins' could stand for "I Can Hardly Believe It's Not Scheme!"


THANKS

To Johnicholas Hines for example code.

To Manuel Simoni and Kragen Sitaker for feedback.


LICENSE & CONTACT

Copyright 2007 Darius Bacon under the terms of the MIT X license
found at http://www.opensource.org/licenses/mit-license.html

Darius Bacon <darius@wry.me>
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