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(* Copyright (c) 2009, 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 Effective :> EFFECTIZE = struct
open Core
structure U = CoreUtil
structure IM = IntBinaryMap
structure SS = BinarySetFn(struct
type ord_key = string
val compare = String.compare
end)
val effectful = ["dml", "nextval", "send", "setCookie"]
val effectful = SS.addList (SS.empty, effectful)
fun effectize file =
let
fun exp evs e =
case e of
EFfi ("Basis", s) => SS.member (effectful, s)
| EFfiApp ("Basis", s, _) => SS.member (effectful, s)
| ENamed n => IM.inDomain (evs, n)
| EServerCall (n, _, _, _) => IM.inDomain (evs, n)
| _ => false
fun couldWrite evs = U.Exp.exists {kind = fn _ => false,
con = fn _ => false,
exp = exp evs}
fun exp evs e =
case e of
EFfi ("Basis", "getCookie") => true
| ENamed n => IM.inDomain (evs, n)
| EServerCall (n, _, _, _) => IM.inDomain (evs, n)
| _ => false
fun couldReadCookie evs = U.Exp.exists {kind = fn _ => false,
con = fn _ => false,
exp = exp evs}
fun doDecl (d, evs as (writers, readers)) =
case #1 d of
DVal (x, n, t, e, s) =>
(d, (if couldWrite writers e then
IM.insert (writers, n, (#2 d, s))
else
writers,
if couldReadCookie readers e then
IM.insert (readers, n, (#2 d, s))
else
readers))
| DValRec vis =>
let
fun oneRound evs =
foldl (fn ((_, n, _, e, s), (changed, (writers, readers))) =>
let
val (changed, writers) =
if couldWrite writers e andalso not (IM.inDomain (writers, n)) then
(true, IM.insert (writers, n, (#2 d, s)))
else
(changed, writers)
val (changed, readers) =
if couldReadCookie readers e andalso not (IM.inDomain (readers, n)) then
(true, IM.insert (readers, n, (#2 d, s)))
else
(changed, readers)
in
(changed, (writers, readers))
end) (false, evs) vis
fun loop evs =
let
val (b, evs) = oneRound evs
in
if b then
loop evs
else
evs
end
in
(d, loop (writers, readers))
end
| DExport (Link, n) =>
(case IM.find (writers, n) of
NONE => ()
| SOME (loc, s) => ErrorMsg.errorAt loc ("A link (" ^ s ^ ") could cause side effects; try implementing it with a form instead");
(d, evs))
| DExport (Action _, n) =>
((DExport (Action (if IM.inDomain (writers, n) then
if IM.inDomain (readers, n) then
ReadCookieWrite
else
ReadWrite
else
ReadOnly), n), #2 d),
evs)
| DExport (Rpc _, n) =>
((DExport (Rpc (if IM.inDomain (writers, n) then
if IM.inDomain (readers, n) then
ReadCookieWrite
else
ReadWrite
else
ReadOnly), n), #2 d),
evs)
| _ => (d, evs)
val (file, _) = ListUtil.foldlMap doDecl (IM.empty, IM.empty) file
in
file
end
end
|
