|
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@23
|
44 fun shake file =
|
|
adamc@100
|
45 let
|
|
adamc@109
|
46 val page_es = List.foldl
|
|
adamc@109
|
47 (fn ((DExport n, _), page_es) => n :: page_es
|
|
adamc@109
|
48 | (_, page_es) => page_es) [] file
|
|
adamc@23
|
49
|
|
adamc@100
|
50 val (cdef, edef) = foldl (fn ((DCon (_, n, _, c), _), (cdef, edef)) => (IM.insert (cdef, n, c), edef)
|
|
adamc@109
|
51 | ((DVal (_, n, t, e, _), _), (cdef, edef)) => (cdef, IM.insert (edef, n, (t, e)))
|
|
adamc@109
|
52 | ((DExport _, _), acc) => acc)
|
|
adamc@100
|
53 (IM.empty, IM.empty) file
|
|
adamc@23
|
54
|
|
adamc@100
|
55 fun kind (_, s) = s
|
|
adamc@23
|
56
|
|
adamc@100
|
57 fun con (c, s) =
|
|
adamc@100
|
58 case c of
|
|
adamc@100
|
59 CNamed n =>
|
|
adamc@100
|
60 if IS.member (#con s, n) then
|
|
adamc@100
|
61 s
|
|
adamc@100
|
62 else
|
|
adamc@100
|
63 let
|
|
adamc@100
|
64 val s' = {con = IS.add (#con s, n),
|
|
adamc@100
|
65 exp = #exp s}
|
|
adamc@100
|
66 in
|
|
adamc@100
|
67 case IM.find (cdef, n) of
|
|
adamc@100
|
68 NONE => s'
|
|
adamc@100
|
69 | SOME c => shakeCon s' c
|
|
adamc@100
|
70 end
|
|
adamc@100
|
71 | _ => s
|
|
adamc@23
|
72
|
|
adamc@100
|
73 and shakeCon s = U.Con.fold {kind = kind, con = con} s
|
|
adamc@23
|
74
|
|
adamc@100
|
75 fun exp (e, s) =
|
|
adamc@100
|
76 case e of
|
|
adamc@100
|
77 ENamed n =>
|
|
adamc@100
|
78 if IS.member (#exp s, n) then
|
|
adamc@100
|
79 s
|
|
adamc@100
|
80 else
|
|
adamc@100
|
81 let
|
|
adamc@100
|
82 val s' = {exp = IS.add (#exp s, n),
|
|
adamc@100
|
83 con = #con s}
|
|
adamc@100
|
84 in
|
|
adamc@100
|
85 case IM.find (edef, n) of
|
|
adamc@100
|
86 NONE => s'
|
|
adamc@100
|
87 | SOME (t, e) => shakeExp (shakeCon s' t) e
|
|
adamc@100
|
88 end
|
|
adamc@100
|
89 | _ => s
|
|
adamc@23
|
90
|
|
adamc@100
|
91 and shakeExp s = U.Exp.fold {kind = kind, con = con, exp = exp} s
|
|
adamc@100
|
92
|
|
adamc@109
|
93 val s = {con = IS.empty, exp = IS.addList (IS.empty, page_es)}
|
|
adamc@109
|
94
|
|
adamc@109
|
95 val s = foldl (fn (n, s) =>
|
|
adamc@109
|
96 case IM.find (edef, n) of
|
|
adamc@109
|
97 NONE => raise Fail "Shake: Couldn't find 'val'"
|
|
adamc@109
|
98 | SOME (t, e) => shakeExp (shakeCon s t) e) s page_es
|
|
adamc@100
|
99 in
|
|
adamc@100
|
100 List.filter (fn (DCon (_, n, _, _), _) => IS.member (#con s, n)
|
|
adamc@109
|
101 | (DVal (_, n, _, _, _), _) => IS.member (#exp s, n)
|
|
adamc@109
|
102 | (DExport _, _) => true) file
|
|
adamc@100
|
103 end
|
|
adamc@23
|
104
|
|
adamc@23
|
105 end
|
