mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-06-23 12:00:21 +02:00
c4a209b96f
* module/language/cps/self-references.scm: New pass, avoids the need for self-recursion to allocate free variables. * module/Makefile.am: * module/language/cps/compile-bytecode.scm: Wire up the new pass.
79 lines
2.9 KiB
Scheme
79 lines
2.9 KiB
Scheme
;;; Continuation-passing style (CPS) intermediate language (IL)
|
|
|
|
;; Copyright (C) 2013, 2014 Free Software Foundation, Inc.
|
|
|
|
;;;; This library is free software; you can redistribute it and/or
|
|
;;;; modify it under the terms of the GNU Lesser General Public
|
|
;;;; License as published by the Free Software Foundation; either
|
|
;;;; version 3 of the License, or (at your option) any later version.
|
|
;;;;
|
|
;;;; This library 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
|
|
;;;; Lesser General Public License for more details.
|
|
;;;;
|
|
;;;; You should have received a copy of the GNU Lesser General Public
|
|
;;;; License along with this library; if not, write to the Free Software
|
|
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
;;; Commentary:
|
|
;;;
|
|
;;; A pass that prunes successors of expressions that bail out.
|
|
;;;
|
|
;;; Code:
|
|
|
|
(define-module (language cps self-references)
|
|
#:use-module (ice-9 match)
|
|
#:use-module (language cps)
|
|
#:export (resolve-self-references))
|
|
|
|
(define* (resolve-self-references fun #:optional (env '()))
|
|
(define (subst var)
|
|
(or (assq-ref env var) var))
|
|
|
|
(define (visit-cont cont)
|
|
(rewrite-cps-cont cont
|
|
(($ $cont label ($ $kargs names vars body))
|
|
(label ($kargs names vars ,(visit-term body))))
|
|
(($ $cont label ($ $kentry self tail clause))
|
|
(label ($kentry self ,tail
|
|
,(and clause (visit-cont clause)))))
|
|
(($ $cont label ($ $kclause arity body alternate))
|
|
(label ($kclause ,arity ,(visit-cont body)
|
|
,(and alternate (visit-cont alternate)))))
|
|
(_ ,cont)))
|
|
|
|
(define (visit-term term)
|
|
(rewrite-cps-term term
|
|
(($ $letrec names vars funs body)
|
|
($letrec names vars (map visit-recursive-fun funs vars)
|
|
,(visit-term body)))
|
|
(($ $letk conts body)
|
|
($letk ,(map visit-cont conts)
|
|
,(visit-term body)))
|
|
(($ $continue k src exp)
|
|
($continue k src ,(visit-exp exp)))))
|
|
|
|
(define (visit-exp exp)
|
|
(rewrite-cps-exp exp
|
|
((or ($ $void) ($ $const) ($ $prim)) ,exp)
|
|
(($ $fun) ,(resolve-self-references exp env))
|
|
(($ $call proc args)
|
|
($call (subst proc) ,(map subst args)))
|
|
(($ $callk k proc args)
|
|
($callk k (subst proc) ,(map subst args)))
|
|
(($ $primcall name args)
|
|
($primcall name ,(map subst args)))
|
|
(($ $values args)
|
|
($values ,(map subst args)))
|
|
(($ $prompt escape? tag handler)
|
|
($prompt escape? (subst tag) handler))))
|
|
|
|
(define (visit-recursive-fun fun var)
|
|
(match fun
|
|
(($ $fun src meta free (and cont ($ $cont _ ($ $kentry self))))
|
|
(resolve-self-references fun (acons var self env)))))
|
|
|
|
(rewrite-cps-exp fun
|
|
(($ $fun src meta free cont)
|
|
($fun src meta (map subst free) ,(visit-cont cont)))))
|