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annotate src/effectize.sml @ 782:a44daa674810

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Make Effectize more precise
author Adam Chlipala <adamc@hcoop.net>
date Tue, 05 May 2009 10:23:16 -0400
parents a28982de5645
children ed06e25c70ef
rev   line source
adamc@732 1 (* Copyright (c) 2009, Adam Chlipala
adamc@732 2 * All rights reserved.
adamc@732 3 *
adamc@732 4 * Redistribution and use in source and binary forms, with or without
adamc@732 5 * modification, are permitted provided that the following conditions are met:
adamc@732 6 *
adamc@732 7 * - Redistributions of source code must retain the above copyright notice,
adamc@732 8 * this list of conditions and the following disclaimer.
adamc@732 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@732 10 * this list of conditions and the following disclaimer in the documentation
adamc@732 11 * and/or other materials provided with the distribution.
adamc@732 12 * - The names of contributors may not be used to endorse or promote products
adamc@732 13 * derived from this software without specific prior written permission.
adamc@732 14 *
adamc@732 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@732 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@732 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@732 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@732 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@732 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@732 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@732 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@732 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@732 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@732 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@732 26 *)
adamc@732 27
adamc@732 28 structure Effective :> EFFECTIZE = struct
adamc@732 29
adamc@732 30 open Core
adamc@732 31
adamc@732 32 structure U = CoreUtil
adamc@732 33
adamc@732 34 structure IM = IntBinaryMap
adamc@732 35 structure SS = BinarySetFn(struct
adamc@732 36 type ord_key = string
adamc@732 37 val compare = String.compare
adamc@732 38 end)
adamc@732 39
adamc@765 40 fun effectful x = Settings.isEffectful x andalso not (Settings.isClientOnly x)
adamc@732 41
adamc@732 42 fun effectize file =
adamc@732 43 let
adamc@782 44 fun expOnload evs e =
adamc@782 45 case e of
adamc@782 46 EFfi f => effectful f
adamc@782 47 | EFfiApp (m, x, _) => effectful (m, x)
adamc@782 48 | ENamed n => IM.inDomain (evs, n)
adamc@782 49 | EServerCall (n, _, _, _) => IM.inDomain (evs, n)
adamc@782 50 | _ => false
adamc@782 51
adamc@782 52 fun couldWriteOnload evs = U.Exp.exists {kind = fn _ => false,
adamc@782 53 con = fn _ => false,
adamc@782 54 exp = expOnload evs}
adamc@782 55
adamc@732 56 fun exp evs e =
adamc@732 57 case e of
adamc@765 58 EFfi f => effectful f
adamc@765 59 | EFfiApp (m, x, _) => effectful (m, x)
adamc@732 60 | ENamed n => IM.inDomain (evs, n)
adamc@782 61 | ERecord xets => List.exists (fn ((CName "Onload", _), e, _) => couldWriteOnload evs e
adamc@782 62 | _ => false) xets
adamc@732 63 | _ => false
adamc@732 64
adamc@732 65 fun couldWrite evs = U.Exp.exists {kind = fn _ => false,
adamc@732 66 con = fn _ => false,
adamc@732 67 exp = exp evs}
adamc@732 68
adamc@735 69 fun exp evs e =
adamc@735 70 case e of
adamc@735 71 EFfi ("Basis", "getCookie") => true
adamc@735 72 | ENamed n => IM.inDomain (evs, n)
adamc@735 73 | EServerCall (n, _, _, _) => IM.inDomain (evs, n)
adamc@735 74 | _ => false
adamc@735 75
adamc@735 76 fun couldReadCookie evs = U.Exp.exists {kind = fn _ => false,
adamc@735 77 con = fn _ => false,
adamc@735 78 exp = exp evs}
adamc@735 79
adamc@735 80 fun doDecl (d, evs as (writers, readers)) =
adamc@732 81 case #1 d of
adamc@732 82 DVal (x, n, t, e, s) =>
adamc@735 83 (d, (if couldWrite writers e then
adamc@735 84 IM.insert (writers, n, (#2 d, s))
adamc@735 85 else
adamc@735 86 writers,
adamc@735 87 if couldReadCookie readers e then
adamc@735 88 IM.insert (readers, n, (#2 d, s))
adamc@735 89 else
adamc@735 90 readers))
adamc@732 91 | DValRec vis =>
adamc@732 92 let
adamc@732 93 fun oneRound evs =
adamc@735 94 foldl (fn ((_, n, _, e, s), (changed, (writers, readers))) =>
adamc@735 95 let
adamc@735 96 val (changed, writers) =
adamc@735 97 if couldWrite writers e andalso not (IM.inDomain (writers, n)) then
adamc@735 98 (true, IM.insert (writers, n, (#2 d, s)))
adamc@735 99 else
adamc@735 100 (changed, writers)
adamc@735 101
adamc@735 102 val (changed, readers) =
adamc@735 103 if couldReadCookie readers e andalso not (IM.inDomain (readers, n)) then
adamc@735 104 (true, IM.insert (readers, n, (#2 d, s)))
adamc@735 105 else
adamc@735 106 (changed, readers)
adamc@735 107 in
adamc@735 108 (changed, (writers, readers))
adamc@735 109 end) (false, evs) vis
adamc@732 110
adamc@732 111 fun loop evs =
adamc@732 112 let
adamc@732 113 val (b, evs) = oneRound evs
adamc@732 114 in
adamc@732 115 if b then
adamc@732 116 loop evs
adamc@732 117 else
adamc@732 118 evs
adamc@732 119 end
adamc@732 120 in
adamc@735 121 (d, loop (writers, readers))
adamc@732 122 end
adamc@732 123 | DExport (Link, n) =>
adamc@735 124 (case IM.find (writers, n) of
adamc@732 125 NONE => ()
adamc@732 126 | SOME (loc, s) => ErrorMsg.errorAt loc ("A link (" ^ s ^ ") could cause side effects; try implementing it with a form instead");
adamc@732 127 (d, evs))
adamc@732 128 | DExport (Action _, n) =>
adamc@735 129 ((DExport (Action (if IM.inDomain (writers, n) then
adamc@735 130 if IM.inDomain (readers, n) then
adamc@735 131 ReadCookieWrite
adamc@735 132 else
adamc@735 133 ReadWrite
adamc@732 134 else
adamc@732 135 ReadOnly), n), #2 d),
adamc@732 136 evs)
adamc@732 137 | DExport (Rpc _, n) =>
adamc@735 138 ((DExport (Rpc (if IM.inDomain (writers, n) then
adamc@735 139 if IM.inDomain (readers, n) then
adamc@735 140 ReadCookieWrite
adamc@735 141 else
adamc@735 142 ReadWrite
adamc@732 143 else
adamc@732 144 ReadOnly), n), #2 d),
adamc@732 145 evs)
adamc@732 146 | _ => (d, evs)
adamc@732 147
adamc@735 148 val (file, _) = ListUtil.foldlMap doDecl (IM.empty, IM.empty) file
adamc@732 149 in
adamc@732 150 file
adamc@732 151 end
adamc@732 152
adamc@732 153 end