[slime-devel] Refactoring, take two

[Luke Gorrie]

Ahoy,

I'm having another crack at backend refactoring. This time I'm going
"by the book" and doing it incrementally on CVS HEAD.

The plan is to move to James's plan [1], roughly:

  swank.lisp:             shared, portable code
  swank-backend.lisp:     defines the interface to non-portable code
  swank-{cmucl,...}.lisp: implements the interface from swank-backend.lisp

Ultimately each file will be a different package, but for now all
files are in the SWANK package. The advantage is that nothing breaks
by default - some things are now working via swank-backend.lisp, but
the rest (not refactored yet) is just like before and still works.

The most significant refactoring so far is the compiler-note
reportage: now each backend detects a compiler note in whatever
non-portable way is appropriate, then resignals it as a
`swank:compiler-condition' which is handled in swank.lisp. So all the
notes-database business is shared now.

I also switched to using generic functions to define callbacks and
methods to implement them. This seems like a neat fit compared with my
ugly macro hacks from last time.

Still hacking, so things may be a little unstable. Currently

NB: I updated the FAIRLY-STABLE tag incase I'm breaking
things. Currently HEAD should be okay on all platforms AFAIK.

NB2: SLIME's surprisingly nice for doing major surgery on itself, at
least when not breaking the debugger and repl :-)

NB3: Thanks James, Dan, and Brian for helping me with OpenMCL access!

Cheers,
Luke

1: http://jamesjb.com/slime/slime-impl.txt