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(* Copyright (c) 2013, Adam Chlipala
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - The names of contributors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*)
structure SigCheck :> SIG_CHECK = struct
open Mono
structure IS = IntBinarySet
structure E = ErrorMsg
fun check (ds, sl) =
let
fun isSiggy siggers =
MonoUtil.Decl.exists {typ = fn _ => false,
decl = fn _ => false,
exp = fn e =>
case e of
ERel n => IS.member (siggers, n)
| EFfiApp ("Basis", "sigString", _) => true
| _ => false}
fun sigify' sigdecs e =
case e of
ENamed n => if IS.member (sigdecs, n) then
(EApp ((e, E.dummySpan),
(ERecord [], E.dummySpan)))
else
e
| _ => e
fun sigify sigdecs =
MonoUtil.Decl.map {typ = fn x => x,
decl = fn d => d,
exp = sigify' sigdecs}
fun sigifyE sigdecs =
MonoUtil.Exp.map {typ = fn x => x,
exp = sigify' sigdecs}
fun isFun (e, _) =
case e of
EAbs _ => true
| _ => false
fun doDecl (d : decl, (siggers, sigdecs)) =
case #1 d of
DVal (x, n, t, e, s) =>
if isSiggy siggers d then
if isFun e then
(sigify sigdecs d, (IS.add (siggers, n), sigdecs))
else
((DVal (x, n, (TFun ((TRecord [], #2 d), t), #2 d),
(EAbs ("_", (TRecord [], #2 d), t, sigifyE sigdecs e), #2 d),
s), #2 d),
(IS.add (siggers, n),
IS.add (sigdecs, n)))
else
(sigify sigdecs d, (siggers, sigdecs))
| DValRec vis =>
if isSiggy siggers d then
(sigify sigdecs d,
(foldl IS.add' siggers (map #2 vis),
sigdecs))
else
(sigify sigdecs d, (siggers, sigdecs))
| _ => (sigify sigdecs d, (siggers, sigdecs))
val (ds, _) = ListUtil.foldlMap doDecl (IS.empty, IS.empty) ds
in
(ds, sl)
end
end
|
