#| -*-Scheme-*-

$Id: asm.scm,v 1.5 2003/02/14 18:28:01 cph Exp $

Copyright (c) 1989-1999 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

MIT/GNU Scheme is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with MIT/GNU Scheme; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.

|#

;;;; Source (lap) assembler

(declare (usual-integrations))

;; To be loaded in (compiler top-level)

;;; Example of `lap->code' usage:

(define bar
  ;; defines bar to be a procedure that adds 1 to its argument
  ;; with no type or range checks.
  (scode-eval
   (lap->code
    'start
    `((pea (@pcr proc))
      (or b (& ,(* (microcode-type 'compiled-entry) 4)) (@a 7))
      (mov l (@a+ 7) (@ao 6 8))
      (and b (& #x3) (@a 7))
      (rts)
      (dc uw #x0202)
      (block-offset proc)
      (label proc)
      (mov l (@a+ 7) (d 0))
      (addq l (& 1) (d 0))
      (mov l (d 0) (@ao 6 8))
      (and b (& #x3) (@a 7))
      (rts)))
   '()))

(define (lap->code label lap)
  (in-compiler
   (lambda ()
     (set! *lap* lap)
     (set! *entry-label* label)
     (set! *current-label-number* 0)
     (set! *next-constant* 0)
     (set! *interned-constants* '())
     (set! *interned-variables* '())
     (set! *interned-assignments* '())
     (set! *interned-uuo-links* '())
     (set! *block-label* (generate-label))
     (set! *external-labels* '())
     (set! *ic-procedure-headers* '())
     (phase/assemble)
     (phase/link)
     *result*)))