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Strengthen consNeq, to avoid unwise unifications
author Adam Chlipala <adam@chlipala.net>
date Sat, 05 Nov 2011 11:33:59 -0400
parents b4480a56cab7
children e15234fbb163
rev   line source
adamc@1265 1 (* Copyright (c) 2008-2010, Adam Chlipala
adamc@23 2 * All rights reserved.
adamc@23 3 *
adamc@23 4 * Redistribution and use in source and binary forms, with or without
adamc@23 5 * modification, are permitted provided that the following conditions are met:
adamc@23 6 *
adamc@23 7 * - Redistributions of source code must retain the above copyright notice,
adamc@23 8 * this list of conditions and the following disclaimer.
adamc@23 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@23 10 * this list of conditions and the following disclaimer in the documentation
adamc@23 11 * and/or other materials provided with the distribution.
adamc@23 12 * - The names of contributors may not be used to endorse or promote products
adamc@23 13 * derived from this software without specific prior written permission.
adamc@23 14 *
adamc@23 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@23 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@23 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@23 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@23 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@23 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@23 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@23 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@23 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@23 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@23 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@23 26 *)
adamc@23 27
adamc@23 28 (* Remove unused definitions from a file *)
adamc@23 29
adamc@23 30 structure Shake :> SHAKE = struct
adamc@23 31
adamc@1112 32 val sliceDb = ref false
adamc@1112 33
adamc@23 34 open Core
adamc@23 35
adamc@23 36 structure U = CoreUtil
adamc@23 37
adamc@23 38 structure IS = IntBinarySet
adamc@23 39 structure IM = IntBinaryMap
adamc@23 40
adamc@23 41 type free = {
adamc@23 42 con : IS.set,
adamc@23 43 exp : IS.set
adamc@23 44 }
adamc@23 45
adamc@338 46 val dummyt = (TRecord (CRecord ((KType, ErrorMsg.dummySpan), []), ErrorMsg.dummySpan), ErrorMsg.dummySpan)
adamc@247 47 val dummye = (EPrim (Prim.String ""), ErrorMsg.dummySpan)
adamc@247 48
adamc@1060 49 fun tupleC cs = (CTuple cs, ErrorMsg.dummySpan)
adamc@1060 50 fun tupleE es = (ERecord (map (fn e => (dummyt, e, dummyt)) es), ErrorMsg.dummySpan)
adamc@1060 51
adamc@23 52 fun shake file =
adamc@100 53 let
adamc@1060 54 val usedVarsC = U.Con.fold {kind = fn (_, st) => st,
adamc@1060 55 con = fn (c, cs) =>
adamc@1060 56 case c of
adamc@1060 57 CNamed n => IS.add (cs, n)
adamc@1060 58 | _ => cs}
adamc@1060 59
adamc@704 60 val usedVars = U.Exp.fold {kind = fn (_, st) => st,
adamc@704 61 con = fn (c, st as (es, cs)) =>
adamc@704 62 case c of
adamc@704 63 CNamed n => (es, IS.add (cs, n))
adamc@704 64 | _ => st,
adamc@704 65 exp = fn (e, st as (es, cs)) =>
adamc@704 66 case e of
adamc@704 67 ENamed n => (IS.add (es, n), cs)
adamc@704 68 | _ => st}
adamc@704 69
adamc@1060 70 val (usedE, usedC) =
adamc@248 71 List.foldl
adamc@1112 72 (fn ((DExport (_, n, _), _), st as (usedE, usedC)) =>
adamc@1112 73 if !sliceDb then
adamc@1112 74 st
adamc@1112 75 else
adamc@1112 76 (IS.add (usedE, n), usedC)
adamc@1060 77 | ((DTable (_, _, c, _, pe, pc, ce, cc), _), (usedE, usedC)) =>
adamc@704 78 let
adamc@1060 79 val usedC = usedVarsC usedC c
adamc@1060 80 val usedC = usedVarsC usedC pc
adamc@1060 81 val usedC = usedVarsC usedC cc
adamc@1060 82
adamc@707 83 val (usedE, usedC) = usedVars (usedE, usedC) pe
adamc@707 84 val (usedE, usedC) = usedVars (usedE, usedC) ce
adamc@704 85 in
adamc@1060 86 (usedE, usedC)
adamc@704 87 end
adamc@1265 88 | ((DView (_, _, _, e, c), _), (usedE, usedC)) =>
adamc@1265 89 let
adamc@1265 90 val usedC = usedVarsC usedC c
adamc@1265 91 in
adamc@1265 92 usedVars (usedE, usedC) e
adamc@1265 93 end
adamc@1112 94 | ((DTask (e1, e2), _), st) =>
adamc@1112 95 if !sliceDb then
adamc@1112 96 st
adamc@1112 97 else
adamc@1112 98 usedVars (usedVars st e1) e2
adamc@1199 99 | ((DPolicy e1, _), st) =>
adamc@1199 100 if !sliceDb then
adamc@1199 101 st
adamc@1199 102 else
adamc@1199 103 usedVars st e1
adam@1294 104 | ((DOnError n, _), st as (usedE, usedC)) =>
adam@1294 105 if !sliceDb then
adam@1294 106 st
adam@1294 107 else
adam@1294 108 (IS.add (usedE, n), usedC)
adamc@1060 109 | (_, acc) => acc) (IS.empty, IS.empty) file
adamc@23 110
adamc@163 111 val (cdef, edef) = foldl (fn ((DCon (_, n, _, c), _), (cdef, edef)) => (IM.insert (cdef, n, [c]), edef)
adamc@807 112 | ((DDatatype dts, _), (cdef, edef)) =>
adamc@807 113 (foldl (fn ((_, n, _, xncs), cdef) =>
adamc@807 114 IM.insert (cdef, n, List.mapPartial #3 xncs)) cdef dts, edef)
adamc@453 115 | ((DVal (_, n, t, e, _), _), (cdef, edef)) => (cdef, IM.insert (edef, n, ([], t, e)))
adamc@125 116 | ((DValRec vis, _), (cdef, edef)) =>
adamc@453 117 let
adamc@453 118 val all_ns = map (fn (_, n, _, _, _) => n) vis
adamc@453 119 in
adamc@453 120 (cdef, foldl (fn ((_, n, t, e, _), edef) =>
adamc@453 121 IM.insert (edef, n, (all_ns, t, e))) edef vis)
adamc@453 122 end
adamc@247 123 | ((DExport _, _), acc) => acc
adamc@1060 124 | ((DTable (_, n, c, _, e1, c1, e2, c2), _), (cdef, edef)) =>
adamc@1060 125 (cdef, IM.insert (edef, n, ([], tupleC [c, c1, c2], tupleE [e1, e2])))
adamc@338 126 | ((DSequence (_, n, _), _), (cdef, edef)) =>
adamc@453 127 (cdef, IM.insert (edef, n, ([], dummyt, dummye)))
adamc@754 128 | ((DView (_, n, _, _, c), _), (cdef, edef)) =>
adamc@754 129 (cdef, IM.insert (edef, n, ([], c, dummye)))
adamc@461 130 | ((DDatabase _, _), acc) => acc
adamc@461 131 | ((DCookie (_, n, c, _), _), (cdef, edef)) =>
adamc@718 132 (cdef, IM.insert (edef, n, ([], c, dummye)))
adamc@720 133 | ((DStyle (_, n, _), _), (cdef, edef)) =>
adamc@1073 134 (cdef, IM.insert (edef, n, ([], dummyt, dummye)))
adamc@1199 135 | ((DTask _, _), acc) => acc
adam@1294 136 | ((DPolicy _, _), acc) => acc
adam@1294 137 | ((DOnError _, _), acc) => acc)
adamc@100 138 (IM.empty, IM.empty) file
adamc@23 139
adamc@100 140 fun kind (_, s) = s
adamc@23 141
adamc@100 142 fun con (c, s) =
adamc@100 143 case c of
adamc@100 144 CNamed n =>
adamc@100 145 if IS.member (#con s, n) then
adamc@100 146 s
adamc@100 147 else
adamc@100 148 let
adamc@100 149 val s' = {con = IS.add (#con s, n),
adamc@100 150 exp = #exp s}
adamc@100 151 in
adamc@100 152 case IM.find (cdef, n) of
adamc@100 153 NONE => s'
adamc@163 154 | SOME cs => foldl (fn (c, s') => shakeCon s' c) s' cs
adamc@100 155 end
adamc@100 156 | _ => s
adamc@23 157
adamc@100 158 and shakeCon s = U.Con.fold {kind = kind, con = con} s
adamc@23 159
adamc@1080 160 (*val () = print "=====\nSHAKE\n=====\n"
adamc@1080 161 val current = ref 0*)
adamc@1080 162
adamc@100 163 fun exp (e, s) =
adamc@607 164 let
adamc@607 165 fun check n =
adamc@607 166 if IS.member (#exp s, n) then
adamc@607 167 s
adamc@607 168 else
adamc@607 169 let
adamc@607 170 val s' = {exp = IS.add (#exp s, n),
adamc@607 171 con = #con s}
adamc@607 172 in
adamc@1080 173 (*print ("Need " ^ Int.toString n ^ " <-- " ^ Int.toString (!current) ^ "\n");*)
adamc@607 174 case IM.find (edef, n) of
adamc@607 175 NONE => s'
adamc@607 176 | SOME (ns, t, e) =>
adamc@607 177 let
adamc@1080 178 (*val old = !current
adamc@1080 179 val () = current := n*)
adamc@607 180 val s' = shakeExp (shakeCon s' t) e
adamc@607 181 in
adamc@1080 182 (*current := old;*)
adamc@607 183 foldl (fn (n, s') => exp (ENamed n, s')) s' ns
adamc@607 184 end
adamc@607 185 end
adamc@607 186 in
adamc@607 187 case e of
adamc@607 188 ENamed n => check n
adamc@1020 189 | EServerCall (n, _, _) => check n
adamc@607 190 | _ => s
adamc@607 191 end
adamc@23 192
adamc@100 193 and shakeExp s = U.Exp.fold {kind = kind, con = con, exp = exp} s
adamc@100 194
adamc@704 195 val s = {con = usedC, exp = usedE}
adamc@109 196
adamc@704 197 val s = IS.foldl (fn (n, s) =>
adamc@704 198 case IM.find (edef, n) of
adamc@704 199 NONE => raise Fail "Shake: Couldn't find 'val'"
adamc@704 200 | SOME (ns, t, e) =>
adamc@704 201 let
adamc@1080 202 (*val () = current := n*)
adamc@704 203 val s = shakeExp (shakeCon s t) e
adamc@704 204 in
adamc@704 205 foldl (fn (n, s) => exp (ENamed n, s)) s ns
adamc@704 206 end) s usedE
adamc@248 207
adamc@1060 208 val s = IS.foldl (fn (n, s) =>
adamc@1060 209 case IM.find (cdef, n) of
adamc@1062 210 NONE => raise Fail ("Shake: Couldn't find 'con' " ^ Int.toString n)
adamc@1060 211 | SOME cs => foldl (fn (c, s) => shakeCon s c) s cs) s usedC
adamc@100 212 in
adamc@100 213 List.filter (fn (DCon (_, n, _, _), _) => IS.member (#con s, n)
adamc@807 214 | (DDatatype dts, _) => List.exists (fn (_, n, _, _) => IS.member (#con s, n)) dts
adamc@109 215 | (DVal (_, n, _, _, _), _) => IS.member (#exp s, n)
adamc@125 216 | (DValRec vis, _) => List.exists (fn (_, n, _, _, _) => IS.member (#exp s, n)) vis
adamc@1112 217 | (DExport _, _) => not (!sliceDb)
adamc@754 218 | (DView _, _) => true
adamc@754 219 | (DSequence _, _) => true
adamc@271 220 | (DTable _, _) => true
adamc@1112 221 | (DDatabase _, _) => not (!sliceDb)
adamc@1112 222 | (DCookie _, _) => not (!sliceDb)
adamc@1112 223 | (DStyle _, _) => not (!sliceDb)
adamc@1199 224 | (DTask _, _) => not (!sliceDb)
adam@1294 225 | (DPolicy _, _) => not (!sliceDb)
adam@1294 226 | (DOnError _, _) => not (!sliceDb)) file
adamc@100 227 end
adamc@23 228
adamc@23 229 end