/usr/lib/ats-anairiats-0.2.11/libats/SATS/freelst.sats is in ats-lang-anairiats 0.2.11-1build1.
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(* *)
(* Applied Type System *)
(* *)
(* Hongwei Xi *)
(* *)
(***********************************************************************)
(*
** ATS - Unleashing the Potential of Types!
** Copyright (C) 2002-2010 Hongwei Xi, Boston University
** All rights reserved
**
** ATS 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 2.1, or (at your option) any
** later version.
**
** ATS 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 ATS; see the file COPYING. If not, please write to the
** Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
** 02110-1301, USA.
*)
(* ****** ****** *)
(*
**
** A simple implementation of free-lists (of memory items)
**
** Contributed by Hongwei Xi (hwxi AT cs DOT bu DOT edu)
** Time: August, 2009
**
*)
(* ****** ****** *)
(*
** memory for storing a pointer to the next item
*)
sortdef itm = {a:viewt@ype | sizeof a >= sizeof ptr}
(* ****** ****** *)
abst@ype freeitm_t (a:viewt@ype, l:addr)
typedef freeitm_t (a:viewt@ype) = [l:addr] freeitm_t (a, l)
(* ****** ****** *)
fun freeitm_nxt_get {a:itm}
{l:addr} (x: &freeitm_t (a, l)):<> ptr l // x
= "atslib_freeitm_nxt_get"
fun freeitm_nxt_set {a:itm} {l1,l2:addr}
(x: &freeitm_t (a, l1) >> freeitm_t (a, l2), p: ptr l2):<> void // x := p
= "atslib_freeitm_nxt_set"
(* ****** ****** *)
absview freelst_v (a:viewt@ype, l:addr)
prfun freelst_v_nil {a:viewt@ype} (): freelst_v (a, null)
prfun freelst_v_unnil {a:viewt@ype} (pf: freelst_v (a, null)): void
prfun freelst_v_cons {a:viewt@ype} {l0:addr} {l:addr}
(pf1: freeitm_t (a, l) @ l0, pf2: freelst_v (a, l)): freelst_v (a, l0)
// end of [extern]
prfun freelst_v_uncons {a:viewt@ype} {l0:addr | l0 <> null}
(pf: freelst_v (a, l0)): [l:addr] (freeitm_t (a, l) @ l0, freelst_v (a, l))
// end of [extern]
(* ****** ****** *)
fun freelst_cons
{a:itm} {l_at,l:addr} (
pf_at: a? @ l_at, pf: !freelst_v (a, l) >> freelst_v (a, l_at)
| p_at: ptr l_at, p: ptr l
) :<> void
// end of [freelst_cons]
fun freelst_uncons
{a:itm} {l:addr | l <> null} (
pf: !freelst_v (a, l) >> freelst_v (a, l_nxt) | p: ptr l)
:<> #[l_nxt:addr] (a? @ l | ptr l_nxt)
// end of [freelst_uncons]
(* ****** ****** *)
fun{a:itm} freelst_add_bytes
{l:addr} {n:nat} {l_arr:addr} (
pf: !freelst_v (a, l) >> freelst_v (a, l), pf_arr: b0ytes n @ l_arr
| p: ptr l, p_arr: ptr l_arr, n: size_t n
) :<> #[l:addr] ptr l
// end of [freelst_add_bytes]
fun freelst_add_bytes_tsz
{a:itm} {l:addr} {n:nat} {l_arr:addr} (
pf: !freelst_v (a, l) >> freelst_v (a, l), pf_arr: b0ytes n @ l_arr
| p: ptr l, p_arr: ptr l_arr, n: size_t n, tsz: sizeof_t a
) :<> #[l:addr] ptr l
// end of [freelst_add_bytes_tsz]
(* ****** ****** *)
(* end of [freelst.sats] *)
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