#| -*-Scheme-*-

$Id: asm.scm,v 1.7 2007/01/05 21:19:20 cph Exp $

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

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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
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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
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|#

;;;; 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*)))