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tables.scm
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1999-01-02
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67 lines
#| -*-Scheme-*-
$Id: tables.scm,v 4.3 1999/01/02 06:19:10 cph Exp $
Copyright (c) 1987, 1993, 1999 Massachusetts Institute of Technology
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|#
;;;; SCode Optimizer: Tables
(declare (usual-integrations)
(integrate-external "object"))
;;;; Operations
(define (operations/make)
(cons '() '()))
(define (operations/lookup operations variable if-found if-not)
(let ((entry (assq variable (car operations))))
(if entry
(if (cdr entry)
(if-found (cadr entry) (cddr entry))
(if-not))
(let ((entry (assq variable (cdr operations))))
(if entry
(if-found (cadr entry) (cddr entry))
(if-not))))))
(define (operations/shadow operations variables)
(cons (map* (car operations)
(lambda (variable) (cons variable false))
variables)
(cdr operations)))
(define (operations/bind operations operation variable value)
(cons (cons (cons* variable operation value)
(car operations))
(cdr operations)))
(define (operations/bind-global operations operation variable value)
(cons (car operations)
(cons (cons* variable operation value)
(cdr operations))))
(define (operations/map-external operations procedure)
(let loop ((elements (car operations)))
(cond ((null? elements)
'())
((cdar elements)
(cons (procedure (cadar elements) (caar elements) (cddar elements))
(loop (cdr elements))))
(else
(loop (cdr elements))))))