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annotate src/mono_shake.sml @ 683:9a2c18dab11d

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Expunging non-nullable rows
author Adam Chlipala <adamc@hcoop.net>
date Sun, 29 Mar 2009 13:30:01 -0400
parents 56aaa1941dad
children a3ddf05fb3e3
rev   line source
adamc@134 1 (* Copyright (c) 2008, Adam Chlipala
adamc@134 2 * All rights reserved.
adamc@134 3 *
adamc@134 4 * Redistribution and use in source and binary forms, with or without
adamc@134 5 * modification, are permitted provided that the following conditions are met:
adamc@134 6 *
adamc@134 7 * - Redistributions of source code must retain the above copyright notice,
adamc@134 8 * this list of conditions and the following disclaimer.
adamc@134 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@134 10 * this list of conditions and the following disclaimer in the documentation
adamc@134 11 * and/or other materials provided with the distribution.
adamc@134 12 * - The names of contributors may not be used to endorse or promote products
adamc@134 13 * derived from this software without specific prior written permission.
adamc@134 14 *
adamc@134 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@134 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@134 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@134 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@134 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@134 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@134 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@134 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@134 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@134 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@134 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@134 26 *)
adamc@134 27
adamc@134 28 (* Remove unused definitions from a file *)
adamc@134 29
adamc@134 30 structure MonoShake :> MONO_SHAKE = struct
adamc@134 31
adamc@134 32 open Mono
adamc@134 33
adamc@134 34 structure U = MonoUtil
adamc@134 35
adamc@134 36 structure IS = IntBinarySet
adamc@134 37 structure IM = IntBinaryMap
adamc@134 38
adamc@134 39 type free = {
adamc@134 40 con : IS.set,
adamc@134 41 exp : IS.set
adamc@134 42 }
adamc@134 43
adamc@134 44 fun shake file =
adamc@134 45 let
adamc@134 46 val page_es = List.foldl
adamc@609 47 (fn ((DExport (_, _, n, _, _), _), page_es) => n :: page_es
adamc@683 48 | ((DDatabase (_, n), _), page_es) => n :: page_es
adamc@134 49 | (_, page_es) => page_es) [] file
adamc@134 50
adamc@178 51 val (cdef, edef) = foldl (fn ((DDatatype (_, n, xncs), _), (cdef, edef)) =>
adamc@178 52 (IM.insert (cdef, n, xncs), edef)
adamc@178 53 | ((DVal (_, n, t, e, _), _), (cdef, edef)) =>
adamc@178 54 (cdef, IM.insert (edef, n, (t, e)))
adamc@134 55 | ((DValRec vis, _), (cdef, edef)) =>
adamc@134 56 (cdef, foldl (fn ((_, n, t, e, _), edef) => IM.insert (edef, n, (t, e))) edef vis)
adamc@271 57 | ((DExport _, _), acc) => acc
adamc@273 58 | ((DTable _, _), acc) => acc
adamc@338 59 | ((DSequence _, _), acc) => acc
adamc@569 60 | ((DDatabase _, _), acc) => acc
adamc@569 61 | ((DJavaScript _, _), acc) => acc)
adamc@134 62 (IM.empty, IM.empty) file
adamc@134 63
adamc@164 64 fun typ (c, s) =
adamc@164 65 case c of
adamc@196 66 TDatatype (n, _) =>
adamc@164 67 if IS.member (#con s, n) then
adamc@164 68 s
adamc@164 69 else
adamc@178 70 let
adamc@178 71 val s' = {exp = #exp s,
adamc@178 72 con = IS.add (#con s, n)}
adamc@178 73 in
adamc@178 74 case IM.find (cdef, n) of
adamc@178 75 NONE => s'
adamc@178 76 | SOME xncs => foldl (fn ((_, _, to), s) =>
adamc@178 77 case to of
adamc@178 78 NONE => s
adamc@178 79 | SOME t => shakeTyp s t)
adamc@178 80 s' xncs
adamc@178 81 end
adamc@164 82 | _ => s
adamc@134 83
adamc@178 84 and shakeTyp s = U.Typ.fold typ s
adamc@178 85
adamc@134 86 fun exp (e, s) =
adamc@134 87 case e of
adamc@134 88 ENamed n =>
adamc@134 89 if IS.member (#exp s, n) then
adamc@134 90 s
adamc@134 91 else
adamc@134 92 let
adamc@134 93 val s' = {exp = IS.add (#exp s, n),
adamc@134 94 con = #con s}
adamc@134 95 in
adamc@134 96 case IM.find (edef, n) of
adamc@134 97 NONE => s'
adamc@134 98 | SOME (t, e) => shakeExp s' e
adamc@134 99 end
adamc@134 100 | _ => s
adamc@134 101
adamc@134 102 and shakeExp s = U.Exp.fold {typ = typ, exp = exp} s
adamc@134 103
adamc@134 104 val s = {con = IS.empty, exp = IS.addList (IS.empty, page_es)}
adamc@134 105
adamc@134 106 val s = foldl (fn (n, s) =>
adamc@134 107 case IM.find (edef, n) of
adamc@134 108 NONE => raise Fail "Shake: Couldn't find 'val'"
adamc@134 109 | SOME (t, e) => shakeExp s e) s page_es
adamc@134 110 in
adamc@164 111 List.filter (fn (DDatatype (_, n, _), _) => IS.member (#con s, n)
adamc@164 112 | (DVal (_, n, _, _, _), _) => IS.member (#exp s, n)
adamc@134 113 | (DValRec vis, _) => List.exists (fn (_, n, _, _, _) => IS.member (#exp s, n)) vis
adamc@271 114 | (DExport _, _) => true
adamc@273 115 | (DTable _, _) => true
adamc@338 116 | (DSequence _, _) => true
adamc@569 117 | (DDatabase _, _) => true
adamc@569 118 | (DJavaScript _, _) => true) file
adamc@134 119 end
adamc@134 120
adamc@134 121 end