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annotate src/effectize.sml @ 768:3b7e46790fa7

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Path rewriting
author Adam Chlipala <adamc@hcoop.net>
date Sat, 02 May 2009 13:23:07 -0400
parents a28982de5645
children a44daa674810
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@732 44 fun exp evs e =
adamc@732 45 case e of
adamc@765 46 EFfi f => effectful f
adamc@765 47 | EFfiApp (m, x, _) => effectful (m, x)
adamc@732 48 | ENamed n => IM.inDomain (evs, n)
adamc@732 49 | EServerCall (n, _, _, _) => IM.inDomain (evs, n)
adamc@732 50 | _ => false
adamc@732 51
adamc@732 52 fun couldWrite evs = U.Exp.exists {kind = fn _ => false,
adamc@732 53 con = fn _ => false,
adamc@732 54 exp = exp evs}
adamc@732 55
adamc@735 56 fun exp evs e =
adamc@735 57 case e of
adamc@735 58 EFfi ("Basis", "getCookie") => true
adamc@735 59 | ENamed n => IM.inDomain (evs, n)
adamc@735 60 | EServerCall (n, _, _, _) => IM.inDomain (evs, n)
adamc@735 61 | _ => false
adamc@735 62
adamc@735 63 fun couldReadCookie evs = U.Exp.exists {kind = fn _ => false,
adamc@735 64 con = fn _ => false,
adamc@735 65 exp = exp evs}
adamc@735 66
adamc@735 67 fun doDecl (d, evs as (writers, readers)) =
adamc@732 68 case #1 d of
adamc@732 69 DVal (x, n, t, e, s) =>
adamc@735 70 (d, (if couldWrite writers e then
adamc@735 71 IM.insert (writers, n, (#2 d, s))
adamc@735 72 else
adamc@735 73 writers,
adamc@735 74 if couldReadCookie readers e then
adamc@735 75 IM.insert (readers, n, (#2 d, s))
adamc@735 76 else
adamc@735 77 readers))
adamc@732 78 | DValRec vis =>
adamc@732 79 let
adamc@732 80 fun oneRound evs =
adamc@735 81 foldl (fn ((_, n, _, e, s), (changed, (writers, readers))) =>
adamc@735 82 let
adamc@735 83 val (changed, writers) =
adamc@735 84 if couldWrite writers e andalso not (IM.inDomain (writers, n)) then
adamc@735 85 (true, IM.insert (writers, n, (#2 d, s)))
adamc@735 86 else
adamc@735 87 (changed, writers)
adamc@735 88
adamc@735 89 val (changed, readers) =
adamc@735 90 if couldReadCookie readers e andalso not (IM.inDomain (readers, n)) then
adamc@735 91 (true, IM.insert (readers, n, (#2 d, s)))
adamc@735 92 else
adamc@735 93 (changed, readers)
adamc@735 94 in
adamc@735 95 (changed, (writers, readers))
adamc@735 96 end) (false, evs) vis
adamc@732 97
adamc@732 98 fun loop evs =
adamc@732 99 let
adamc@732 100 val (b, evs) = oneRound evs
adamc@732 101 in
adamc@732 102 if b then
adamc@732 103 loop evs
adamc@732 104 else
adamc@732 105 evs
adamc@732 106 end
adamc@732 107 in
adamc@735 108 (d, loop (writers, readers))
adamc@732 109 end
adamc@732 110 | DExport (Link, n) =>
adamc@735 111 (case IM.find (writers, n) of
adamc@732 112 NONE => ()
adamc@732 113 | SOME (loc, s) => ErrorMsg.errorAt loc ("A link (" ^ s ^ ") could cause side effects; try implementing it with a form instead");
adamc@732 114 (d, evs))
adamc@732 115 | DExport (Action _, n) =>
adamc@735 116 ((DExport (Action (if IM.inDomain (writers, n) then
adamc@735 117 if IM.inDomain (readers, n) then
adamc@735 118 ReadCookieWrite
adamc@735 119 else
adamc@735 120 ReadWrite
adamc@732 121 else
adamc@732 122 ReadOnly), n), #2 d),
adamc@732 123 evs)
adamc@732 124 | DExport (Rpc _, n) =>
adamc@735 125 ((DExport (Rpc (if IM.inDomain (writers, n) then
adamc@735 126 if IM.inDomain (readers, n) then
adamc@735 127 ReadCookieWrite
adamc@735 128 else
adamc@735 129 ReadWrite
adamc@732 130 else
adamc@732 131 ReadOnly), n), #2 d),
adamc@732 132 evs)
adamc@732 133 | _ => (d, evs)
adamc@732 134
adamc@735 135 val (file, _) = ListUtil.foldlMap doDecl (IM.empty, IM.empty) file
adamc@732 136 in
adamc@732 137 file
adamc@732 138 end
adamc@732 139
adamc@732 140 end