52 lines
1.8 KiB
Scheme
52 lines
1.8 KiB
Scheme
;;; Ported from Scheme 48 1.9. See file COPYING for notices and license.
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;;;
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;;; Port Author: Andrew Whatson
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;;;
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;;; Original Authors: Richard Kelsey, Mike Sperber
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;;;
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;;; scheme48-1.9.2/ps-compiler/node/node-util.scm
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;;;
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;;; This file contains miscellaneous utilities for accessing and modifying the
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;;; node tree.
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;;;
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(define-module (ps-compiler node node-letrec)
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#:use-module (prescheme scheme48)
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#:use-module (ps-compiler node let-nodes)
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#:use-module (ps-compiler node node)
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#:use-module (ps-compiler node node-util)
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#:use-module (ps-compiler node primop)
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#:use-module (ps-compiler node variable)
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#:export (put-in-letrec make-letrec))
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;;-------------------------------------------------------------------------------
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;; Bind VARS to VALUES using letrec at CALL. If CALL is already a letrec
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;; call, just add to it, otherwise make a new one.
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(define (put-in-letrec vars values call)
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(cond ((eq? 'letrec2 (primop-id (call-primop call)))
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(let ((binder (node-parent call)))
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(mark-changed call)
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(for-each (lambda (var)
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(set-variable-binder! var binder))
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vars)
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(set-lambda-variables! binder
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(append (lambda-variables binder) vars))
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(for-each (lambda (value)
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(append-call-arg call value))
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values)))
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(else
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(move-body
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call
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(lambda (call)
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(receive (letrec-call letrec-cont)
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(make-letrec vars values)
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(attach-body letrec-cont call)
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letrec-call))))))
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(define (make-letrec vars vals)
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(let ((cont (make-lambda-node 'c 'cont '())))
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(let-nodes ((call (letrec1 1 l2))
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(l2 ((x #f) . vars) (letrec2 1 cont (* x) . vals)))
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(values call cont))))
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