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Some post-type-checking support for polymorphic variants
author Adam Chlipala <adam@chlipala.net>
date Sat, 21 Aug 2010 10:58:13 -0400
parents e8d68fd8ed4b
children b4480a56cab7
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
adamc@1060 104 | (_, acc) => acc) (IS.empty, IS.empty) file
adamc@23 105
adamc@163 106 val (cdef, edef) = foldl (fn ((DCon (_, n, _, c), _), (cdef, edef)) => (IM.insert (cdef, n, [c]), edef)
adamc@807 107 | ((DDatatype dts, _), (cdef, edef)) =>
adamc@807 108 (foldl (fn ((_, n, _, xncs), cdef) =>
adamc@807 109 IM.insert (cdef, n, List.mapPartial #3 xncs)) cdef dts, edef)
adamc@453 110 | ((DVal (_, n, t, e, _), _), (cdef, edef)) => (cdef, IM.insert (edef, n, ([], t, e)))
adamc@125 111 | ((DValRec vis, _), (cdef, edef)) =>
adamc@453 112 let
adamc@453 113 val all_ns = map (fn (_, n, _, _, _) => n) vis
adamc@453 114 in
adamc@453 115 (cdef, foldl (fn ((_, n, t, e, _), edef) =>
adamc@453 116 IM.insert (edef, n, (all_ns, t, e))) edef vis)
adamc@453 117 end
adamc@247 118 | ((DExport _, _), acc) => acc
adamc@1060 119 | ((DTable (_, n, c, _, e1, c1, e2, c2), _), (cdef, edef)) =>
adamc@1060 120 (cdef, IM.insert (edef, n, ([], tupleC [c, c1, c2], tupleE [e1, e2])))
adamc@338 121 | ((DSequence (_, n, _), _), (cdef, edef)) =>
adamc@453 122 (cdef, IM.insert (edef, n, ([], dummyt, dummye)))
adamc@754 123 | ((DView (_, n, _, _, c), _), (cdef, edef)) =>
adamc@754 124 (cdef, IM.insert (edef, n, ([], c, dummye)))
adamc@461 125 | ((DDatabase _, _), acc) => acc
adamc@461 126 | ((DCookie (_, n, c, _), _), (cdef, edef)) =>
adamc@718 127 (cdef, IM.insert (edef, n, ([], c, dummye)))
adamc@720 128 | ((DStyle (_, n, _), _), (cdef, edef)) =>
adamc@1073 129 (cdef, IM.insert (edef, n, ([], dummyt, dummye)))
adamc@1199 130 | ((DTask _, _), acc) => acc
adamc@1199 131 | ((DPolicy _, _), acc) => acc)
adamc@100 132 (IM.empty, IM.empty) file
adamc@23 133
adamc@100 134 fun kind (_, s) = s
adamc@23 135
adamc@100 136 fun con (c, s) =
adamc@100 137 case c of
adamc@100 138 CNamed n =>
adamc@100 139 if IS.member (#con s, n) then
adamc@100 140 s
adamc@100 141 else
adamc@100 142 let
adamc@100 143 val s' = {con = IS.add (#con s, n),
adamc@100 144 exp = #exp s}
adamc@100 145 in
adamc@100 146 case IM.find (cdef, n) of
adamc@100 147 NONE => s'
adamc@163 148 | SOME cs => foldl (fn (c, s') => shakeCon s' c) s' cs
adamc@100 149 end
adamc@100 150 | _ => s
adamc@23 151
adamc@100 152 and shakeCon s = U.Con.fold {kind = kind, con = con} s
adamc@23 153
adamc@1080 154 (*val () = print "=====\nSHAKE\n=====\n"
adamc@1080 155 val current = ref 0*)
adamc@1080 156
adamc@100 157 fun exp (e, s) =
adamc@607 158 let
adamc@607 159 fun check n =
adamc@607 160 if IS.member (#exp s, n) then
adamc@607 161 s
adamc@607 162 else
adamc@607 163 let
adamc@607 164 val s' = {exp = IS.add (#exp s, n),
adamc@607 165 con = #con s}
adamc@607 166 in
adamc@1080 167 (*print ("Need " ^ Int.toString n ^ " <-- " ^ Int.toString (!current) ^ "\n");*)
adamc@607 168 case IM.find (edef, n) of
adamc@607 169 NONE => s'
adamc@607 170 | SOME (ns, t, e) =>
adamc@607 171 let
adamc@1080 172 (*val old = !current
adamc@1080 173 val () = current := n*)
adamc@607 174 val s' = shakeExp (shakeCon s' t) e
adamc@607 175 in
adamc@1080 176 (*current := old;*)
adamc@607 177 foldl (fn (n, s') => exp (ENamed n, s')) s' ns
adamc@607 178 end
adamc@607 179 end
adamc@607 180 in
adamc@607 181 case e of
adamc@607 182 ENamed n => check n
adamc@1020 183 | EServerCall (n, _, _) => check n
adamc@607 184 | _ => s
adamc@607 185 end
adamc@23 186
adamc@100 187 and shakeExp s = U.Exp.fold {kind = kind, con = con, exp = exp} s
adamc@100 188
adamc@704 189 val s = {con = usedC, exp = usedE}
adamc@109 190
adamc@704 191 val s = IS.foldl (fn (n, s) =>
adamc@704 192 case IM.find (edef, n) of
adamc@704 193 NONE => raise Fail "Shake: Couldn't find 'val'"
adamc@704 194 | SOME (ns, t, e) =>
adamc@704 195 let
adamc@1080 196 (*val () = current := n*)
adamc@704 197 val s = shakeExp (shakeCon s t) e
adamc@704 198 in
adamc@704 199 foldl (fn (n, s) => exp (ENamed n, s)) s ns
adamc@704 200 end) s usedE
adamc@248 201
adamc@1060 202 val s = IS.foldl (fn (n, s) =>
adamc@1060 203 case IM.find (cdef, n) of
adamc@1062 204 NONE => raise Fail ("Shake: Couldn't find 'con' " ^ Int.toString n)
adamc@1060 205 | SOME cs => foldl (fn (c, s) => shakeCon s c) s cs) s usedC
adamc@100 206 in
adamc@100 207 List.filter (fn (DCon (_, n, _, _), _) => IS.member (#con s, n)
adamc@807 208 | (DDatatype dts, _) => List.exists (fn (_, n, _, _) => IS.member (#con s, n)) dts
adamc@109 209 | (DVal (_, n, _, _, _), _) => IS.member (#exp s, n)
adamc@125 210 | (DValRec vis, _) => List.exists (fn (_, n, _, _, _) => IS.member (#exp s, n)) vis
adamc@1112 211 | (DExport _, _) => not (!sliceDb)
adamc@754 212 | (DView _, _) => true
adamc@754 213 | (DSequence _, _) => true
adamc@271 214 | (DTable _, _) => true
adamc@1112 215 | (DDatabase _, _) => not (!sliceDb)
adamc@1112 216 | (DCookie _, _) => not (!sliceDb)
adamc@1112 217 | (DStyle _, _) => not (!sliceDb)
adamc@1199 218 | (DTask _, _) => not (!sliceDb)
adamc@1199 219 | (DPolicy _, _) => not (!sliceDb)) file
adamc@100 220 end
adamc@23 221
adamc@23 222 end