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annotate src/shake.sml @ 1018:9304474170ed

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Extend Fuse to work on non-recursive functions
author Adam Chlipala <adamc@hcoop.net>
date Sun, 25 Oct 2009 13:02:13 -0400
parents 2a50da66ffd8
children dfe34fad749d
rev   line source
adamc@23 1 (* Copyright (c) 2008, 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@23 32 open Core
adamc@23 33
adamc@23 34 structure U = CoreUtil
adamc@23 35
adamc@23 36 structure IS = IntBinarySet
adamc@23 37 structure IM = IntBinaryMap
adamc@23 38
adamc@23 39 type free = {
adamc@23 40 con : IS.set,
adamc@23 41 exp : IS.set
adamc@23 42 }
adamc@23 43
adamc@338 44 val dummyt = (TRecord (CRecord ((KType, ErrorMsg.dummySpan), []), ErrorMsg.dummySpan), ErrorMsg.dummySpan)
adamc@247 45 val dummye = (EPrim (Prim.String ""), ErrorMsg.dummySpan)
adamc@247 46
adamc@23 47 fun shake file =
adamc@100 48 let
adamc@704 49 val usedVars = U.Exp.fold {kind = fn (_, st) => st,
adamc@704 50 con = fn (c, st as (es, cs)) =>
adamc@704 51 case c of
adamc@704 52 CNamed n => (es, IS.add (cs, n))
adamc@704 53 | _ => st,
adamc@704 54 exp = fn (e, st as (es, cs)) =>
adamc@704 55 case e of
adamc@704 56 ENamed n => (IS.add (es, n), cs)
adamc@704 57 | _ => st}
adamc@704 58
adamc@704 59 val (usedE, usedC, table_cs) =
adamc@248 60 List.foldl
adamc@704 61 (fn ((DExport (_, n), _), (usedE, usedC, table_cs)) => (IS.add (usedE, n), usedE, table_cs)
adamc@707 62 | ((DTable (_, _, c, _, pe, _, ce, _), _), (usedE, usedC, table_cs)) =>
adamc@704 63 let
adamc@707 64 val (usedE, usedC) = usedVars (usedE, usedC) pe
adamc@707 65 val (usedE, usedC) = usedVars (usedE, usedC) ce
adamc@704 66 in
adamc@704 67 (usedE, usedC, c :: table_cs)
adamc@704 68 end
adamc@704 69 | (_, acc) => acc) (IS.empty, IS.empty, []) file
adamc@23 70
adamc@163 71 val (cdef, edef) = foldl (fn ((DCon (_, n, _, c), _), (cdef, edef)) => (IM.insert (cdef, n, [c]), edef)
adamc@807 72 | ((DDatatype dts, _), (cdef, edef)) =>
adamc@807 73 (foldl (fn ((_, n, _, xncs), cdef) =>
adamc@807 74 IM.insert (cdef, n, List.mapPartial #3 xncs)) cdef dts, edef)
adamc@453 75 | ((DVal (_, n, t, e, _), _), (cdef, edef)) => (cdef, IM.insert (edef, n, ([], t, e)))
adamc@125 76 | ((DValRec vis, _), (cdef, edef)) =>
adamc@453 77 let
adamc@453 78 val all_ns = map (fn (_, n, _, _, _) => n) vis
adamc@453 79 in
adamc@453 80 (cdef, foldl (fn ((_, n, t, e, _), edef) =>
adamc@453 81 IM.insert (edef, n, (all_ns, t, e))) edef vis)
adamc@453 82 end
adamc@247 83 | ((DExport _, _), acc) => acc
adamc@707 84 | ((DTable (_, n, c, _, _, _, _, _), _), (cdef, edef)) =>
adamc@453 85 (cdef, IM.insert (edef, n, ([], c, dummye)))
adamc@338 86 | ((DSequence (_, n, _), _), (cdef, edef)) =>
adamc@453 87 (cdef, IM.insert (edef, n, ([], dummyt, dummye)))
adamc@754 88 | ((DView (_, n, _, _, c), _), (cdef, edef)) =>
adamc@754 89 (cdef, IM.insert (edef, n, ([], c, dummye)))
adamc@461 90 | ((DDatabase _, _), acc) => acc
adamc@461 91 | ((DCookie (_, n, c, _), _), (cdef, edef)) =>
adamc@718 92 (cdef, IM.insert (edef, n, ([], c, dummye)))
adamc@720 93 | ((DStyle (_, n, _), _), (cdef, edef)) =>
adamc@720 94 (cdef, IM.insert (edef, n, ([], dummyt, dummye))))
adamc@100 95 (IM.empty, IM.empty) file
adamc@23 96
adamc@100 97 fun kind (_, s) = s
adamc@23 98
adamc@100 99 fun con (c, s) =
adamc@100 100 case c of
adamc@100 101 CNamed n =>
adamc@100 102 if IS.member (#con s, n) then
adamc@100 103 s
adamc@100 104 else
adamc@100 105 let
adamc@100 106 val s' = {con = IS.add (#con s, n),
adamc@100 107 exp = #exp s}
adamc@100 108 in
adamc@100 109 case IM.find (cdef, n) of
adamc@100 110 NONE => s'
adamc@163 111 | SOME cs => foldl (fn (c, s') => shakeCon s' c) s' cs
adamc@100 112 end
adamc@100 113 | _ => s
adamc@23 114
adamc@100 115 and shakeCon s = U.Con.fold {kind = kind, con = con} s
adamc@23 116
adamc@100 117 fun exp (e, s) =
adamc@607 118 let
adamc@607 119 fun check n =
adamc@607 120 if IS.member (#exp s, n) then
adamc@607 121 s
adamc@607 122 else
adamc@607 123 let
adamc@607 124 val s' = {exp = IS.add (#exp s, n),
adamc@607 125 con = #con s}
adamc@607 126 in
adamc@607 127 (*print ("Need " ^ Int.toString n ^ "\n");*)
adamc@607 128 case IM.find (edef, n) of
adamc@607 129 NONE => s'
adamc@607 130 | SOME (ns, t, e) =>
adamc@607 131 let
adamc@607 132 val s' = shakeExp (shakeCon s' t) e
adamc@607 133 in
adamc@607 134 foldl (fn (n, s') => exp (ENamed n, s')) s' ns
adamc@607 135 end
adamc@607 136 end
adamc@607 137 in
adamc@607 138 case e of
adamc@607 139 ENamed n => check n
adamc@908 140 | EServerCall (n, _, _, _, _) => check n
adamc@954 141 | ETailCall (n, _, _, _, _) => check n
adamc@607 142 | _ => s
adamc@607 143 end
adamc@23 144
adamc@100 145 and shakeExp s = U.Exp.fold {kind = kind, con = con, exp = exp} s
adamc@100 146
adamc@704 147 val s = {con = usedC, exp = usedE}
adamc@109 148
adamc@704 149 val s = IS.foldl (fn (n, s) =>
adamc@704 150 case IM.find (edef, n) of
adamc@704 151 NONE => raise Fail "Shake: Couldn't find 'val'"
adamc@704 152 | SOME (ns, t, e) =>
adamc@704 153 let
adamc@704 154 val s = shakeExp (shakeCon s t) e
adamc@704 155 in
adamc@704 156 foldl (fn (n, s) => exp (ENamed n, s)) s ns
adamc@704 157 end) s usedE
adamc@248 158
adamc@248 159 val s = foldl (fn (c, s) => shakeCon s c) s table_cs
adamc@100 160 in
adamc@100 161 List.filter (fn (DCon (_, n, _, _), _) => IS.member (#con s, n)
adamc@807 162 | (DDatatype dts, _) => List.exists (fn (_, n, _, _) => IS.member (#con s, n)) dts
adamc@109 163 | (DVal (_, n, _, _, _), _) => IS.member (#exp s, n)
adamc@125 164 | (DValRec vis, _) => List.exists (fn (_, n, _, _, _) => IS.member (#exp s, n)) vis
adamc@247 165 | (DExport _, _) => true
adamc@754 166 | (DView _, _) => true
adamc@754 167 | (DSequence _, _) => true
adamc@271 168 | (DTable _, _) => true
adamc@461 169 | (DDatabase _, _) => true
adamc@718 170 | (DCookie _, _) => true
adamc@718 171 | (DStyle _, _) => true) file
adamc@100 172 end
adamc@23 173
adamc@23 174 end