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+;;; Continuation-passing style (CPS) intermediate language (IL)
+
+;; Copyright (C) 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
+
+;;; Code:
+
+(define-module (language cps spec)
+ #:use-module (ice-9 match)
+ #:use-module (system base language)
+ #:use-module (language cps)
+ #:use-module (language cps intmap)
+ #:use-module (language cps compile-bytecode)
+ #:export (cps))
+
+(define (read-cps port env)
+ (let lp ((out empty-intmap))
+ (match (read port)
+ ((k exp) (lp (intmap-add! out k (parse-cps exp))))
+ ((? eof-object?)
+ (if (eq? out empty-intmap)
+ the-eof-object
+ (persistent-intmap out))))))
+
+(define* (write-cps exp #:optional (port (current-output-port)))
+ (intmap-fold (lambda (k cps port)
+ (write (list k (unparse-cps cps)) port)
+ (newline port)
+ port)
+ exp port))
+
+(define-language cps
+ #:title "CPS Intermediate Language"
+ #:reader read-cps
+ #:printer write-cps
+ #:compilers `((bytecode . ,compile-bytecode))
+ #:for-humans? #f
+ )