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;;; Continuation-passing style (CPS) intermediate language (IL)
;; Copyright (C) 2013, 2014, 2015 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:
;;;
;;; Constructor inlining turns "list" primcalls into a series of conses,
;;; and does similar transformations for "vector".
;;;
;;; Code:
(define-module (language cps constructors)
#:use-module (ice-9 match)
#:use-module (srfi srfi-26)
#:use-module (language cps)
#:export (inline-constructors))
(define (inline-constructors* fun)
(define (visit-cont cont)
(rewrite-cps-cont cont
(($ $cont sym ($ $kargs names syms body))
(sym ($kargs names syms ,(visit-term body))))
(($ $cont sym ($ $kfun src meta self tail clause))
(sym ($kfun src meta self ,tail ,(and clause (visit-cont clause)))))
(($ $cont sym ($ $kclause arity body alternate))
(sym ($kclause ,arity ,(visit-cont body)
,(and alternate (visit-cont alternate)))))
(($ $cont)
,cont)))
(define (visit-term term)
(rewrite-cps-term term
(($ $letk conts body)
($letk ,(map visit-cont conts)
,(visit-term body)))
(($ $continue k src ($ $primcall 'list args))
,(let-fresh (kvalues) (val)
(build-cps-term
($letk ((kvalues ($kargs ('val) (val)
($continue k src
($primcall 'values (val))))))
,(let lp ((args args) (k kvalues))
(match args
(()
(build-cps-term
($continue k src ($const '()))))
((arg . args)
(let-fresh (ktail) (tail)
(build-cps-term
($letk ((ktail ($kargs ('tail) (tail)
($continue k src
($primcall 'cons (arg tail))))))
,(lp args ktail)))))))))))
(($ $continue k src ($ $primcall 'vector args))
,(let-fresh (kalloc) (vec len init)
(define (initialize args n)
(match args
(()
(build-cps-term
($continue k src ($primcall 'values (vec)))))
((arg . args)
(let-fresh (knext) (idx)
(build-cps-term
($letk ((knext ($kargs () ()
,(initialize args (1+ n)))))
($letconst (('idx idx n))
($continue knext src
($primcall 'vector-set! (vec idx arg))))))))))
(build-cps-term
($letk ((kalloc ($kargs ('vec) (vec)
,(initialize args 0))))
($letconst (('len len (length args))
('init init #f))
($continue kalloc src
($primcall 'make-vector (len init))))))))
(($ $continue k src (and fun ($ $fun)))
($continue k src ,(visit-fun fun)))
(($ $continue k src ($ $rec names syms funs))
($continue k src ($rec names syms (map visit-fun funs))))
(($ $continue)
,term)))
(define (visit-fun fun)
(rewrite-cps-exp fun
(($ $fun body)
($fun ,(inline-constructors* body)))))
(visit-cont fun))
(define (inline-constructors fun)
(with-fresh-name-state fun
(inline-constructors* fun)))
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