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Reducing (non-mutual) 'val rec'
author Adam Chlipala <adamc@hcoop.net>
date Thu, 17 Jul 2008 10:43:16 -0400
parents 76a4d69719d8
children 78d59cf0a0cc
rev   line source
adamc@29 1 (* Copyright (c) 2008, Adam Chlipala
adamc@29 2 * All rights reserved.
adamc@29 3 *
adamc@29 4 * Redistribution and use in source and binary forms, with or without
adamc@29 5 * modification, are permitted provided that the following conditions are met:
adamc@29 6 *
adamc@29 7 * - Redistributions of source code must retain the above copyright notice,
adamc@29 8 * this list of conditions and the following disclaimer.
adamc@29 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@29 10 * this list of conditions and the following disclaimer in the documentation
adamc@29 11 * and/or other materials provided with the distribution.
adamc@29 12 * - The names of contributors may not be used to endorse or promote products
adamc@29 13 * derived from this software without specific prior written permission.
adamc@29 14 *
adamc@29 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@29 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@29 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@29 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@29 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@29 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@29 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@29 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@29 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@29 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@29 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@29 26 *)
adamc@29 27
adamc@29 28 structure Cjrize :> CJRIZE = struct
adamc@29 29
adamc@109 30 structure L = Mono
adamc@29 31 structure L' = Cjr
adamc@29 32
adamc@29 33 structure Sm :> sig
adamc@29 34 type t
adamc@29 35
adamc@29 36 val empty : t
adamc@29 37 val find : t * (string * L.typ) list * (string * L'.typ) list -> t * int
adamc@29 38
adamc@29 39 val declares : t -> (int * (string * L'.typ) list) list
adamc@29 40 end = struct
adamc@29 41
adamc@29 42 structure FM = BinaryMapFn(struct
adamc@29 43 type ord_key = L.typ
adamc@109 44 val compare = MonoUtil.Typ.compare
adamc@29 45 end)
adamc@29 46
adamc@29 47 type t = int * int FM.map * (int * (string * L'.typ) list) list
adamc@29 48
adamc@102 49 val empty : t = (1, FM.insert (FM.empty, (L.TRecord [], ErrorMsg.dummySpan), 0), [])
adamc@29 50
adamc@29 51 fun find ((n, m, ds), xts, xts') =
adamc@29 52 let
adamc@29 53 val t = (L.TRecord xts, ErrorMsg.dummySpan)
adamc@29 54 in
adamc@29 55 case FM.find (m, t) of
adamc@29 56 NONE => ((n+1, FM.insert (m, t, n), (n, xts') :: ds), n)
adamc@29 57 | SOME i => ((n, m, ds), i)
adamc@29 58 end
adamc@29 59
adamc@29 60 fun declares (_, _, ds) = ds
adamc@29 61
adamc@29 62 end
adamc@29 63
adamc@29 64 fun cifyTyp ((t, loc), sm) =
adamc@29 65 case t of
adamc@109 66 L.TFun (t1, t2) =>
adamc@29 67 let
adamc@29 68 val (t1, sm) = cifyTyp (t1, sm)
adamc@29 69 val (t2, sm) = cifyTyp (t2, sm)
adamc@29 70 in
adamc@109 71 ((L'.TFun (t1, t2), loc), sm)
adamc@29 72 end
adamc@29 73 | L.TRecord xts =>
adamc@29 74 let
adamc@29 75 val old_xts = xts
adamc@29 76 val (xts, sm) = ListUtil.foldlMap (fn ((x, t), sm) =>
adamc@29 77 let
adamc@29 78 val (t, sm) = cifyTyp (t, sm)
adamc@29 79 in
adamc@29 80 ((x, t), sm)
adamc@29 81 end)
adamc@29 82 sm xts
adamc@29 83 val (sm, si) = Sm.find (sm, old_xts, xts)
adamc@29 84 in
adamc@29 85 ((L'.TRecord si, loc), sm)
adamc@29 86 end
adamc@29 87 | L.TNamed n => ((L'.TNamed n, loc), sm)
adamc@53 88 | L.TFfi mx => ((L'.TFfi mx, loc), sm)
adamc@29 89
adamc@109 90 val dummye = (L'.EPrim (Prim.Int 0), ErrorMsg.dummySpan)
adamc@109 91
adamc@29 92 fun cifyExp ((e, loc), sm) =
adamc@29 93 case e of
adamc@29 94 L.EPrim p => ((L'.EPrim p, loc), sm)
adamc@29 95 | L.ERel n => ((L'.ERel n, loc), sm)
adamc@29 96 | L.ENamed n => ((L'.ENamed n, loc), sm)
adamc@53 97 | L.EFfi mx => ((L'.EFfi mx, loc), sm)
adamc@53 98 | L.EFfiApp (m, x, es) =>
adamc@53 99 let
adamc@53 100 val (es, sm) = ListUtil.foldlMap cifyExp sm es
adamc@53 101 in
adamc@53 102 ((L'.EFfiApp (m, x, es), loc), sm)
adamc@53 103 end
adamc@29 104 | L.EApp (e1, e2) =>
adamc@29 105 let
adamc@29 106 val (e1, sm) = cifyExp (e1, sm)
adamc@29 107 val (e2, sm) = cifyExp (e2, sm)
adamc@29 108 in
adamc@29 109 ((L'.EApp (e1, e2), loc), sm)
adamc@29 110 end
adamc@109 111 | L.EAbs _ => (ErrorMsg.errorAt loc "Anonymous function remains at code generation";
adamc@109 112 (dummye, sm))
adamc@29 113
adamc@29 114 | L.ERecord xes =>
adamc@29 115 let
adamc@29 116 val old_xts = map (fn (x, _, t) => (x, t)) xes
adamc@29 117
adamc@29 118 val (xets, sm) = ListUtil.foldlMap (fn ((x, e, t), sm) =>
adamc@29 119 let
adamc@29 120 val (e, sm) = cifyExp (e, sm)
adamc@29 121 val (t, sm) = cifyTyp (t, sm)
adamc@29 122 in
adamc@29 123 ((x, e, t), sm)
adamc@29 124 end)
adamc@29 125 sm xes
adamc@29 126
adamc@29 127 val (sm, si) = Sm.find (sm, old_xts, map (fn (x, _, t) => (x, t)) xets)
adamc@29 128
adamc@29 129 val xes = map (fn (x, e, _) => (x, e)) xets
adamc@29 130 val xes = ListMergeSort.sort (fn ((x1, _), (x2, _)) => String.compare (x1, x2) = GREATER) xes
adamc@29 131 in
adamc@29 132 ((L'.ERecord (si, xes), loc), sm)
adamc@29 133 end
adamc@29 134 | L.EField (e, x) =>
adamc@29 135 let
adamc@29 136 val (e, sm) = cifyExp (e, sm)
adamc@29 137 in
adamc@29 138 ((L'.EField (e, x), loc), sm)
adamc@29 139 end
adamc@29 140
adamc@102 141 | L.EStrcat _ => raise Fail "Cjrize EStrcat"
adamc@102 142
adamc@102 143 | L.EWrite e =>
adamc@102 144 let
adamc@102 145 val (e, sm) = cifyExp (e, sm)
adamc@102 146 in
adamc@102 147 ((L'.EWrite e, loc), sm)
adamc@102 148 end
adamc@102 149
adamc@106 150 | L.ESeq (e1, e2) =>
adamc@106 151 let
adamc@106 152 val (e1, sm) = cifyExp (e1, sm)
adamc@106 153 val (e2, sm) = cifyExp (e2, sm)
adamc@106 154 in
adamc@106 155 ((L'.ESeq (e1, e2), loc), sm)
adamc@106 156 end
adamc@106 157
adamc@111 158 | L.EClosure _ => (ErrorMsg.errorAt loc "Nested closure remains in code generation";
adamc@111 159 (dummye, sm))
adamc@111 160
adamc@29 161 fun cifyDecl ((d, loc), sm) =
adamc@29 162 case d of
adamc@109 163 L.DVal (x, n, t, e, _) =>
adamc@29 164 let
adamc@29 165 val (t, sm) = cifyTyp (t, sm)
adamc@109 166
adamc@109 167 val (d, sm) = case #1 t of
adamc@121 168 L'.TFun _ =>
adamc@121 169 let
adamc@121 170 fun unravel (tAll as (t, _), eAll as (e, _)) =
adamc@121 171 case (t, e) of
adamc@121 172 (L'.TFun (dom, ran), L.EAbs (ax, _, _, e)) =>
adamc@121 173 let
adamc@121 174 val (args, t, e) = unravel (ran, e)
adamc@121 175 in
adamc@121 176 ((ax, dom) :: args, t, e)
adamc@121 177 end
adamc@121 178 | (L'.TFun _, _) =>
adamc@121 179 (ErrorMsg.errorAt loc "Function isn't explicit at code generation";
adamc@121 180 ([], tAll, eAll))
adamc@121 181 | _ => ([], tAll, eAll)
adamc@121 182
adamc@121 183 val (args, ran, e) = unravel (t, e)
adamc@121 184 val (e, sm) = cifyExp (e, sm)
adamc@121 185 in
adamc@121 186 (L'.DFun (x, n, args, ran, e), sm)
adamc@121 187 end
adamc@121 188
adamc@109 189 | _ =>
adamc@109 190 let
adamc@109 191 val (e, sm) = cifyExp (e, sm)
adamc@109 192 in
adamc@109 193 (L'.DVal (x, n, t, e), sm)
adamc@109 194 end
adamc@29 195 in
adamc@109 196 (SOME (d, loc), NONE, sm)
adamc@29 197 end
adamc@126 198 | L.DValRec _ => raise Fail "Cjrize DValRec"
adamc@120 199 | L.DExport (s, n, ts) =>
adamc@120 200 let
adamc@120 201 val (ts, sm) = ListUtil.foldlMap cifyTyp sm ts
adamc@120 202 in
adamc@120 203 (NONE, SOME ("/" ^ s, n, ts), sm)
adamc@120 204 end
adamc@29 205
adamc@29 206 fun cjrize ds =
adamc@29 207 let
adamc@101 208 val (ds, ps, sm) = foldl (fn (d, (ds, ps, sm)) =>
adamc@101 209 let
adamc@101 210 val (dop, pop, sm) = cifyDecl (d, sm)
adamc@101 211 val ds = case dop of
adamc@101 212 NONE => ds
adamc@101 213 | SOME d => d :: ds
adamc@101 214 val ps = case pop of
adamc@101 215 NONE => ps
adamc@101 216 | SOME p => p :: ps
adamc@101 217 in
adamc@101 218 (ds, ps, sm)
adamc@101 219 end)
adamc@101 220 ([], [], Sm.empty) ds
adamc@29 221 in
adamc@101 222 (List.revAppend (map (fn v => (L'.DStruct v, ErrorMsg.dummySpan)) (Sm.declares sm),
adamc@101 223 rev ds),
adamc@101 224 ps)
adamc@29 225 end
adamc@29 226
adamc@29 227 end