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annotate src/effectize.sml @ 1421:3dab4696d116

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Subqueries may always return NULL
author Adam Chlipala <adam@chlipala.net>
date Thu, 03 Feb 2011 21:04:12 -0500
parents 44a12a321150
children 66092ce45a76
rev   line source
adam@1370 1 (* Copyright (c) 2009-2010, 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@1020 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
adam@1361 69 fun exp writers readers pushers e =
adamc@1104 70 case e of
adam@1361 71 ENamed n => IM.inDomain (pushers, n)
adam@1361 72 | EServerCall (n, _, _) => IM.inDomain (writers, n) andalso IM.inDomain (readers, n)
adamc@1104 73 | _ => false
adamc@1104 74
adam@1361 75 fun couldWriteWithRpc writers readers pushers = U.Exp.exists {kind = fn _ => false,
adam@1361 76 con = fn _ => false,
adam@1361 77 exp = exp writers readers pushers}
adamc@1104 78
adamc@735 79 fun exp evs e =
adamc@735 80 case e of
adamc@735 81 EFfi ("Basis", "getCookie") => true
adamc@735 82 | ENamed n => IM.inDomain (evs, n)
adamc@1020 83 | EServerCall (n, _, _) => IM.inDomain (evs, n)
adamc@735 84 | _ => false
adamc@735 85
adamc@735 86 fun couldReadCookie evs = U.Exp.exists {kind = fn _ => false,
adamc@735 87 con = fn _ => false,
adamc@735 88 exp = exp evs}
adamc@735 89
adamc@1104 90 fun doDecl (d, evs as (writers, readers, pushers)) =
adamc@732 91 case #1 d of
adamc@732 92 DVal (x, n, t, e, s) =>
adamc@735 93 (d, (if couldWrite writers e then
adamc@735 94 IM.insert (writers, n, (#2 d, s))
adamc@735 95 else
adamc@735 96 writers,
adamc@735 97 if couldReadCookie readers e then
adamc@735 98 IM.insert (readers, n, (#2 d, s))
adamc@735 99 else
adamc@1104 100 readers,
adam@1361 101 if couldWriteWithRpc writers readers pushers e then
adamc@1104 102 IM.insert (pushers, n, (#2 d, s))
adamc@1104 103 else
adamc@1104 104 pushers))
adamc@732 105 | DValRec vis =>
adamc@732 106 let
adamc@732 107 fun oneRound evs =
adamc@1104 108 foldl (fn ((_, n, _, e, s), (changed, (writers, readers, pushers))) =>
adamc@735 109 let
adamc@735 110 val (changed, writers) =
adamc@735 111 if couldWrite writers e andalso not (IM.inDomain (writers, n)) then
adamc@735 112 (true, IM.insert (writers, n, (#2 d, s)))
adamc@735 113 else
adamc@735 114 (changed, writers)
adamc@735 115
adamc@735 116 val (changed, readers) =
adamc@735 117 if couldReadCookie readers e andalso not (IM.inDomain (readers, n)) then
adamc@735 118 (true, IM.insert (readers, n, (#2 d, s)))
adamc@735 119 else
adamc@735 120 (changed, readers)
adamc@1104 121
adamc@1104 122 val (changed, pushers) =
adam@1361 123 if couldWriteWithRpc writers readers pushers e
adamc@1104 124 andalso not (IM.inDomain (pushers, n)) then
adamc@1104 125 (true, IM.insert (pushers, n, (#2 d, s)))
adamc@1104 126 else
adamc@1104 127 (changed, pushers)
adamc@735 128 in
adamc@1104 129 (changed, (writers, readers, pushers))
adamc@735 130 end) (false, evs) vis
adamc@732 131
adamc@732 132 fun loop evs =
adamc@732 133 let
adamc@732 134 val (b, evs) = oneRound evs
adamc@732 135 in
adamc@732 136 if b then
adamc@732 137 loop evs
adamc@732 138 else
adamc@732 139 evs
adamc@732 140 end
adamc@732 141 in
adamc@1104 142 (d, loop (writers, readers, pushers))
adamc@732 143 end
adam@1370 144 | DExport (Link, n, t) =>
adamc@735 145 (case IM.find (writers, n) of
adamc@732 146 NONE => ()
adamc@1183 147 | SOME (loc, s) =>
adamc@1183 148 if Settings.isSafeGet s then
adamc@1183 149 ()
adamc@1183 150 else
adamc@1183 151 ErrorMsg.errorAt loc ("A link (" ^ s
adamc@1183 152 ^ ") could cause side effects; try implementing it with a form instead");
adamc@1104 153 ((DExport (Link, n, IM.inDomain (pushers, n)), #2 d), evs))
adamc@1104 154 | DExport (Action _, n, _) =>
adamc@735 155 ((DExport (Action (if IM.inDomain (writers, n) then
adamc@735 156 if IM.inDomain (readers, n) then
adamc@735 157 ReadCookieWrite
adamc@735 158 else
adamc@735 159 ReadWrite
adamc@732 160 else
adamc@1104 161 ReadOnly), n, IM.inDomain (pushers, n)), #2 d),
adamc@732 162 evs)
adamc@1104 163 | DExport (Rpc _, n, _) =>
adamc@735 164 ((DExport (Rpc (if IM.inDomain (writers, n) then
adamc@735 165 if IM.inDomain (readers, n) then
adamc@735 166 ReadCookieWrite
adamc@735 167 else
adamc@735 168 ReadWrite
adamc@732 169 else
adamc@1104 170 ReadOnly), n, IM.inDomain (pushers, n)), #2 d),
adamc@732 171 evs)
adam@1347 172 | DExport (Extern _, n, _) =>
adam@1347 173 ((DExport (Extern (if IM.inDomain (writers, n) then
adam@1347 174 if IM.inDomain (readers, n) then
adam@1347 175 ReadCookieWrite
adam@1347 176 else
adam@1347 177 ReadWrite
adam@1347 178 else
adam@1347 179 ReadOnly), n, IM.inDomain (pushers, n)), #2 d),
adam@1347 180 evs)
adamc@732 181 | _ => (d, evs)
adamc@732 182
adamc@1104 183 val (file, _) = ListUtil.foldlMap doDecl (IM.empty, IM.empty, IM.empty) file
adamc@732 184 in
adamc@732 185 file
adamc@732 186 end
adamc@732 187
adamc@732 188 end