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1 (* Copyright (c) 2008, Adam Chlipala
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2 * All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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6 *
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7 * - Redistributions of source code must retain the above copyright notice,
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8 * this list of conditions and the following disclaimer.
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9 * - Redistributions in binary form must reproduce the above copyright notice,
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10 * this list of conditions and the following disclaimer in the documentation
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11 * and/or other materials provided with the distribution.
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12 * - The names of contributors may not be used to endorse or promote products
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13 * derived from this software without specific prior written permission.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 * POSSIBILITY OF SUCH DAMAGE.
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26 *)
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27
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28 (* Remove unused definitions from a file *)
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29
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30 structure Shake :> SHAKE = struct
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31
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32 open Core
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33
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34 structure U = CoreUtil
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35
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36 structure IS = IntBinarySet
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37 structure IM = IntBinaryMap
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38
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39 type free = {
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40 con : IS.set,
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41 exp : IS.set
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42 }
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43
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44 fun shake file =
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45 let
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46 val (page_cs, page_es) = List.foldl
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47 (fn ((DPage (c, e), _), (cs, es)) => (c :: cs, e :: es)
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48 | (_, acc) => acc) ([], []) file
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49
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50 val (cdef, edef) = foldl (fn ((DCon (_, n, _, c), _), (cdef, edef)) => (IM.insert (cdef, n, c), edef)
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51 | ((DVal (_, n, t, e), _), (cdef, edef)) => (cdef, IM.insert (edef, n, (t, e)))
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52 | ((DPage _, _), acc) => acc)
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53 (IM.empty, IM.empty) file
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54
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55 fun kind (_, s) = s
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56
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57 fun con (c, s) =
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58 case c of
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59 CNamed n =>
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60 if IS.member (#con s, n) then
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61 s
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62 else
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63 let
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64 val s' = {con = IS.add (#con s, n),
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65 exp = #exp s}
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66 in
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67 case IM.find (cdef, n) of
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68 NONE => s'
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69 | SOME c => shakeCon s' c
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70 end
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71 | _ => s
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72
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73 and shakeCon s = U.Con.fold {kind = kind, con = con} s
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74
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75 fun exp (e, s) =
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76 case e of
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77 ENamed n =>
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78 if IS.member (#exp s, n) then
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79 s
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80 else
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81 let
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82 val s' = {exp = IS.add (#exp s, n),
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83 con = #con s}
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84 in
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85 case IM.find (edef, n) of
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86 NONE => s'
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87 | SOME (t, e) => shakeExp (shakeCon s' t) e
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88 end
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89 | _ => s
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90
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91 and shakeExp s = U.Exp.fold {kind = kind, con = con, exp = exp} s
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92
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93 val s = {con = IS.empty, exp = IS.empty}
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94
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95 val s = foldl (fn (c, s) => U.Con.fold {kind = kind, con = con} s c) s page_cs
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96 val s = foldl (fn (e, s) => U.Exp.fold {kind = kind, con = con, exp = exp} s e) s page_es
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97 in
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98 List.filter (fn (DCon (_, n, _, _), _) => IS.member (#con s, n)
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99 | (DVal (_, n, _, _), _) => IS.member (#exp s, n)
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100 | (DPage _, _) => true) file
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101 end
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102
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103 end
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