#! /bin/sh
# -*-scheme-*-
echo ' ()' | cat $($(dirname $0)/../scripts/include.mes $0) $0 /dev/stdin | $(dirname $0)/../scripts/mes $MES_FLAGS "$@"
#paredit:||
exit $?
!#

;;; -*-scheme-*-

;;; Mes --- Maxwell Equations of Software
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of Mes.
;;;
;;; Mes 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 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Mes 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 Mes.  If not, see <http://www.gnu.org/licenses/>.

(mes-use-module (mes base-0))
(mes-use-module (mes base))
(mes-use-module (mes quasiquote))
(mes-use-module (mes let))
(mes-use-module (srfi srfi-0))
(mes-use-module (mes scm))
(mes-use-module (mes test))

(when guile?
  (use-modules (srfi srfi-1)))

(pass-if "first dummy" #t)
(pass-if-not "second dummy" #f)

(define gc-size 10)
(define the-cells (make-vector gc-size))
(define gc-free 0)

(define cell-type-alist
  '((0 . c) (1 . m) (2 . n) (3 . p) (4 . i) (5 . $) (6 . s) (7 . r)))

(define (cell-index c)
  (if (eq? (car c) 'p)
      (cdr c)))

(define (describe-cell c)
  (cons (assoc-ref cell-type-alist (mes-type-of c)) c))

(define (iota n)
  (if (= 0 n) '(0)
      (append (iota (- n 1)) (list n))))

(define (gc-show)
  (display "\nfree:") (display gc-free) (newline)
  (map (lambda (i) (display i) (display ": ") (display (describe-cell (vector-ref the-cells i))) (newline)) (iota (- gc-size 1))))

(define (gc-show-new)
  (display "new:\n")
  (map (lambda (i) (display i) (display ": ") (display (describe-cell (vector-ref new-cells i))) (newline)) (iota (- gc-size 1)))
  )
(gc-show)

(define (gc)
  (gc-show)
  barf-gc)

(define (alloc)
  (if (= gc-free gc-size) (gc))
  ((lambda (index)
     (set! gc-free (+ gc-free 1))
     (make-cell 'p index))
   gc-free))

(define (make-cell type . x)
  (cons type (if (pair? x) (car x) '*)))

(define (cell-index c)
  (if (eq? (car c) 'p)
      (cdr c)))

(define (make-number x)
  ((lambda (cell)
     (vector-set! the-cells (cell-index cell) x)
     cell)
   (alloc)))

(define (make-symbol x)
  ((lambda (cell)
     (vector-set! the-cells (cell-index cell) x)
     cell)
   (alloc)))

(define (gc-cons x y)
  ((lambda (cell)
     ((lambda (pair)
        (vector-set! the-cells (cell-index cell) pair)
        (set-car! pair x)
        (set-cdr! pair y))
      (cons *unspecified* *unspecified*))
     cell)
   (alloc)))

;; (define (gc-reg c)
;;   (vector-ref the-cells (cell-index c)))

(define gc-display display)
;;(define (gc-display c) (display (gc-reg c)))
;; (define (gc-car c) (car (gc-reg c)))
;; (define (gc-cdr c) (cdr (gc-reg c)))
;; (define (gc-pair? c) (pair? (gc-reg c)))
;; (define (gc-null? c) (null? (gc-reg c)))
;; (define (gc-display x . cont?)
;;   (if (gc-pair? x) (begin (if (null? cont?) (display "("))
;;                           (gc-display (gc-reg x))
;;                           (if (gc-pair? (gc-cdr x)) (display " "))
;;                           (if (not (gc-null? (gc-cdr x)))
;;                               (gc-display (gc-cdr x) #t))
;;                           (if (null? cont?) (display ")")))
;;       (if (gc-null? x) (if (not cont?) (display "()"))
;;           (display (gc-reg x)))))

(define gc-nil '())
(define first (make-symbol 'F)) (newline)

(define one (make-number 1))
(display "one=") (display one) (newline)
(define two (make-number 2))
(define pair2-nil (gc-cons two gc-nil))
(display "pair2-nil=") (display pair2-nil) (newline)
(gc-show)

(define list1-2 (gc-cons one pair2-nil))
(display "list1-2=") (display list1-2) (newline)
(gc-show)

(define three (make-number 3))
(define four (make-number 4))
(define pair4-nil (gc-cons four gc-nil))
(define list3-4 (gc-cons three pair4-nil))
(define list1234 (gc-cons list1-2 list3-4))
(gc-show)

(display "list1-2=") (display list1-2) (newline)
(display "list3-4=") (display list3-4) (newline)
(display "lst=") (display list1234) (newline)
(gc-show)

(display "sicp-lst:") (gc-display list1234) (newline)
(gc-show)

(display "\n**** trigger gc ****\n")
(define next (gc-list (make-symbol 'N) (make-symbol 'X)))
(set! list1234 '(p . 0))
(display "sicp-lst:") (gc-display list1234) (newline)
(gc-show)
(display "next=") (display next) (newline)
(display "gc-next=") (gc-display next) (newline)
(gc-show)



(result 'report)