/usr/lib/ats2-postiats-0.1.3/libats/DATS/refcount.dats is in ats2-lang 0.1.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(* *)
(* Applied Type System *)
(* *)
(***********************************************************************)
(*
** ATS/Postiats - Unleashing the Potential of Types!
** Copyright (C) 2011-2013 Hongwei Xi, ATS Trustful Software, Inc.
** All rights reserved
**
** ATS is free software; you can redistribute it and/or modify it under
** the terms of the GNU GENERAL PUBLIC LICENSE (GPL) as published by the
** Free Software Foundation; either version 3, 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.
*)
(* ****** ****** *)
(* Author: Hongwei Xi *)
(* Authoremail: hwxi AT cs DOT bu DOT edu *)
(* Start time: July, 2013 *)
(* ****** ****** *)
//
// HX: For supporting ref-counted resourse.
// HX: This implementation does not support locked counting
//
(* ****** ****** *)
staload
UN = "prelude/SATS/unsafe.sats"
(* ****** ****** *)
staload "libats/SATS/refcount.sats"
(* ****** ****** *)
datavtype
refcnt (a:vt@ype) = REFCNT (a) of (uint, a)
(* ****** ****** *)
assume refcnt_vt0ype_vtype (a) = refcnt (a)
(* ****** ****** *)
implement{a}
refcnt_make (x) = REFCNT (1u, x)
(* ****** ****** *)
implement{a}
refcnt_get_count
(rfc) = let
//
val+REFCNT (u, _) = rfc
//
in
$UN.cast{intGte(1)}(u)
end // end of [refcnt_get_count]
(* ****** ****** *)
implement{a}
refcnt_decref
(rfc, x0) = let
//
val+@REFCNT (u, x) = rfc
val u1 = pred (u)
//
in
//
if
isgtz(u1)
then let
val ((*void*)) = u := u1
prval () = fold@(rfc)
prval () = $UN.cast2void (rfc)
prval () = opt_none{a}(x0)
in
false
end else let
val () = x0 := x
val ((*freed*)) = free@(rfc)
prval () = opt_some{a}(x0)
in
true
end // end of [if]
//
end // end of [refcnt_decref]
implement{a}
refcnt_decref_opt
(rfc) = let
//
var x0: a?
val ans = refcnt_decref (rfc, x0)
//
in (* in of [let] *)
//
if ans
then let
prval () = opt_unsome{a}(x0) in Some_vt{a}(x0)
end else let
prval () = opt_unnone{a}(x0) in None_vt{a}((*void*))
end // end of [if]
//
end // end of [refcnt_decref_opt]
(* ****** ****** *)
implement{a}
refcnt_incref
(rfc) = let
//
val+@REFCNT (u, _) = rfc
val ((*void*)) = u := succ (u)
prval () = fold@(rfc)
//
in
$UN.castvwtp1{refcnt(a)}(rfc)
end // end of [refcnt_incref]
(* ****** ****** *)
implement{a}
refcnt_vtakeout
(rfc) = let
//
val+@REFCNT (_, x) = rfc
val p_x = addr@x
prval () = fold@(rfc)
//
val (pf, fpf | p_x) = $UN.ptr_vtake{a}(p_x)
//
in
(pf, fpf | p_x)
end // end of [refcnt_vtakeout]
(* ****** ****** *)
(* end of [refcount.dats] *)
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