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annotate src/flat_util.sml @ 26:4ab19c19665f

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Closure conversion
author Adam Chlipala <adamc@hcoop.net>
date Tue, 10 Jun 2008 15:56:33 -0400
parents
children 104d43266b33
rev   line source
adamc@26 1 (* Copyright (c) 2008, Adam Chlipala
adamc@26 2 * All rights reserved.
adamc@26 3 *
adamc@26 4 * Redistribution and use in source and binary forms, with or without
adamc@26 5 * modification, are permitted provided that the following conditions are met:
adamc@26 6 *
adamc@26 7 * - Redistributions of source code must retain the above copyright notice,
adamc@26 8 * this list of conditions and the following disclaimer.
adamc@26 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@26 10 * this list of conditions and the following disclaimer in the documentation
adamc@26 11 * and/or other materials provided with the distribution.
adamc@26 12 * - The names of contributors may not be used to endorse or promote products
adamc@26 13 * derived from this software without specific prior written permission.
adamc@26 14 *
adamc@26 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@26 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@26 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@26 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@26 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@26 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@26 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@26 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@26 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@26 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@26 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@26 26 *)
adamc@26 27
adamc@26 28 structure FlatUtil :> FLAT_UTIL = struct
adamc@26 29
adamc@26 30 open Flat
adamc@26 31
adamc@26 32 structure S = Search
adamc@26 33
adamc@26 34 structure Typ = struct
adamc@26 35
adamc@26 36 fun mapfold fc =
adamc@26 37 let
adamc@26 38 fun mft c acc =
adamc@26 39 S.bindP (mft' c acc, fc)
adamc@26 40
adamc@26 41 and mft' (cAll as (c, loc)) =
adamc@26 42 case c of
adamc@26 43 TFun (t1, t2) =>
adamc@26 44 S.bind2 (mft t1,
adamc@26 45 fn t1' =>
adamc@26 46 S.map2 (mft t2,
adamc@26 47 fn t2' =>
adamc@26 48 (TFun (t1', t2'), loc)))
adamc@26 49 | TCode (t1, t2) =>
adamc@26 50 S.bind2 (mft t1,
adamc@26 51 fn t1' =>
adamc@26 52 S.map2 (mft t2,
adamc@26 53 fn t2' =>
adamc@26 54 (TCode (t1', t2'), loc)))
adamc@26 55 | TRecord xts =>
adamc@26 56 S.map2 (ListUtil.mapfold (fn (x, t) =>
adamc@26 57 S.map2 (mft t,
adamc@26 58 fn t' =>
adamc@26 59 (x, t')))
adamc@26 60 xts,
adamc@26 61 fn xts' => (TRecord xts', loc))
adamc@26 62 | TNamed _ => S.return2 cAll
adamc@26 63 in
adamc@26 64 mft
adamc@26 65 end
adamc@26 66
adamc@26 67 fun map typ c =
adamc@26 68 case mapfold (fn c => fn () => S.Continue (typ c, ())) c () of
adamc@26 69 S.Return () => raise Fail "Flat_util.Typ.map"
adamc@26 70 | S.Continue (c, ()) => c
adamc@26 71
adamc@26 72 fun fold typ s c =
adamc@26 73 case mapfold (fn c => fn s => S.Continue (c, typ (c, s))) c s of
adamc@26 74 S.Continue (_, s) => s
adamc@26 75 | S.Return _ => raise Fail "FlatUtil.Typ.fold: Impossible"
adamc@26 76
adamc@26 77 fun exists typ k =
adamc@26 78 case mapfold (fn c => fn () =>
adamc@26 79 if typ c then
adamc@26 80 S.Return ()
adamc@26 81 else
adamc@26 82 S.Continue (c, ())) k () of
adamc@26 83 S.Return _ => true
adamc@26 84 | S.Continue _ => false
adamc@26 85
adamc@26 86 end
adamc@26 87
adamc@26 88 structure Exp = struct
adamc@26 89
adamc@26 90 datatype binder =
adamc@26 91 NamedT of string * int * typ option
adamc@26 92 | RelE of string * typ
adamc@26 93 | NamedE of string * int * typ * exp option
adamc@26 94
adamc@26 95 fun mapfoldB {typ = fc, exp = fe, bind} =
adamc@26 96 let
adamc@26 97 val mft = Typ.mapfold fc
adamc@26 98
adamc@26 99 fun mfe ctx e acc =
adamc@26 100 S.bindP (mfe' ctx e acc, fe ctx)
adamc@26 101
adamc@26 102 and mfe' ctx (eAll as (e, loc)) =
adamc@26 103 case e of
adamc@26 104 EPrim _ => S.return2 eAll
adamc@26 105 | ERel _ => S.return2 eAll
adamc@26 106 | ENamed _ => S.return2 eAll
adamc@26 107 | ECode _ => S.return2 eAll
adamc@26 108 | EApp (e1, e2) =>
adamc@26 109 S.bind2 (mfe ctx e1,
adamc@26 110 fn e1' =>
adamc@26 111 S.map2 (mfe ctx e2,
adamc@26 112 fn e2' =>
adamc@26 113 (EApp (e1', e2'), loc)))
adamc@26 114
adamc@26 115 | ERecord xes =>
adamc@26 116 S.map2 (ListUtil.mapfold (fn (x, e) =>
adamc@26 117 S.map2 (mfe ctx e,
adamc@26 118 fn e' =>
adamc@26 119 (x, e')))
adamc@26 120 xes,
adamc@26 121 fn xes' =>
adamc@26 122 (ERecord xes', loc))
adamc@26 123 | EField (e, x) =>
adamc@26 124 S.map2 (mfe ctx e,
adamc@26 125 fn e' =>
adamc@26 126 (EField (e', x), loc))
adamc@26 127
adamc@26 128 | ELet (xes, e) =>
adamc@26 129 S.bind2 (ListUtil.mapfold (fn (x, e) =>
adamc@26 130 S.map2 (mfe ctx e,
adamc@26 131 fn e' =>
adamc@26 132 (x, e')))
adamc@26 133 xes,
adamc@26 134 fn xes' =>
adamc@26 135 S.map2 (mfe ctx e,
adamc@26 136 fn e' =>
adamc@26 137 (ELet (xes', e'), loc)))
adamc@26 138 in
adamc@26 139 mfe
adamc@26 140 end
adamc@26 141
adamc@26 142 fun mapfold {typ = fc, exp = fe} =
adamc@26 143 mapfoldB {typ = fc,
adamc@26 144 exp = fn () => fe,
adamc@26 145 bind = fn ((), _) => ()} ()
adamc@26 146
adamc@26 147 fun mapB {typ, exp, bind} ctx e =
adamc@26 148 case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26 149 exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@26 150 bind = bind} ctx e () of
adamc@26 151 S.Continue (e, ()) => e
adamc@26 152 | S.Return _ => raise Fail "FlatUtil.Exp.mapB: Impossible"
adamc@26 153
adamc@26 154 fun map {typ, exp} e =
adamc@26 155 case mapfold {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26 156 exp = fn e => fn () => S.Continue (exp e, ())} e () of
adamc@26 157 S.Return () => raise Fail "Flat_util.Exp.map"
adamc@26 158 | S.Continue (e, ()) => e
adamc@26 159
adamc@26 160 fun fold {typ, exp} s e =
adamc@26 161 case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26 162 exp = fn e => fn s => S.Continue (e, exp (e, s))} e s of
adamc@26 163 S.Continue (_, s) => s
adamc@26 164 | S.Return _ => raise Fail "FlatUtil.Exp.fold: Impossible"
adamc@26 165
adamc@26 166 fun exists {typ, exp} k =
adamc@26 167 case mapfold {typ = fn c => fn () =>
adamc@26 168 if typ c then
adamc@26 169 S.Return ()
adamc@26 170 else
adamc@26 171 S.Continue (c, ()),
adamc@26 172 exp = fn e => fn () =>
adamc@26 173 if exp e then
adamc@26 174 S.Return ()
adamc@26 175 else
adamc@26 176 S.Continue (e, ())} k () of
adamc@26 177 S.Return _ => true
adamc@26 178 | S.Continue _ => false
adamc@26 179
adamc@26 180 end
adamc@26 181
adamc@26 182 structure Decl = struct
adamc@26 183
adamc@26 184 datatype binder = datatype Exp.binder
adamc@26 185
adamc@26 186 fun mapfoldB {typ = fc, exp = fe, decl = fd, bind} =
adamc@26 187 let
adamc@26 188 val mft = Typ.mapfold fc
adamc@26 189
adamc@26 190 val mfe = Exp.mapfoldB {typ = fc, exp = fe, bind = bind}
adamc@26 191
adamc@26 192 fun mfd ctx d acc =
adamc@26 193 S.bindP (mfd' ctx d acc, fd ctx)
adamc@26 194
adamc@26 195 and mfd' ctx (dAll as (d, loc)) =
adamc@26 196 case d of
adamc@26 197 DVal (x, n, t, e) =>
adamc@26 198 S.bind2 (mft t,
adamc@26 199 fn t' =>
adamc@26 200 S.map2 (mfe ctx e,
adamc@26 201 fn e' =>
adamc@26 202 (DVal (x, n, t', e'), loc)))
adamc@26 203 | DFun (n, x, dom, ran, e) =>
adamc@26 204 S.bind2 (mft dom,
adamc@26 205 fn dom' =>
adamc@26 206 S.bind2 (mft ran,
adamc@26 207 fn ran' =>
adamc@26 208 S.map2 (mfe ctx e,
adamc@26 209 fn e' =>
adamc@26 210 (DFun (n, x, dom', ran', e'), loc))))
adamc@26 211 in
adamc@26 212 mfd
adamc@26 213 end
adamc@26 214
adamc@26 215 fun mapfold {typ = fc, exp = fe, decl = fd} =
adamc@26 216 mapfoldB {typ = fc,
adamc@26 217 exp = fn () => fe,
adamc@26 218 decl = fn () => fd,
adamc@26 219 bind = fn ((), _) => ()} ()
adamc@26 220
adamc@26 221 fun fold {typ, exp, decl} s d =
adamc@26 222 case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26 223 exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@26 224 decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@26 225 S.Continue (_, s) => s
adamc@26 226 | S.Return _ => raise Fail "FlatUtil.Decl.fold: Impossible"
adamc@26 227
adamc@26 228 end
adamc@26 229
adamc@26 230 structure File = struct
adamc@26 231
adamc@26 232 datatype binder =
adamc@26 233 NamedT of string * int * typ option
adamc@26 234 | RelE of string * typ
adamc@26 235 | NamedE of string * int * typ * exp option
adamc@26 236 | F of int * string * Flat.typ * Flat.typ * Flat.exp
adamc@26 237
adamc@26 238 fun mapfoldB (all as {bind, ...}) =
adamc@26 239 let
adamc@26 240 val mfd = Decl.mapfoldB all
adamc@26 241
adamc@26 242 fun mff ctx ds =
adamc@26 243 case ds of
adamc@26 244 nil => S.return2 nil
adamc@26 245 | d :: ds' =>
adamc@26 246 S.bind2 (mfd ctx d,
adamc@26 247 fn d' =>
adamc@26 248 let
adamc@26 249 val b =
adamc@26 250 case #1 d' of
adamc@26 251 DVal (x, n, t, e) => NamedE (x, n, t, SOME e)
adamc@26 252 | DFun v => F v
adamc@26 253 val ctx' = bind (ctx, b)
adamc@26 254 in
adamc@26 255 S.map2 (mff ctx' ds',
adamc@26 256 fn ds' =>
adamc@26 257 d' :: ds')
adamc@26 258 end)
adamc@26 259 in
adamc@26 260 mff
adamc@26 261 end
adamc@26 262
adamc@26 263 fun mapfold {typ = fc, exp = fe, decl = fd} =
adamc@26 264 mapfoldB {typ = fc,
adamc@26 265 exp = fn () => fe,
adamc@26 266 decl = fn () => fd,
adamc@26 267 bind = fn ((), _) => ()} ()
adamc@26 268
adamc@26 269 fun mapB {typ, exp, decl, bind} ctx ds =
adamc@26 270 case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26 271 exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@26 272 decl = fn ctx => fn d => fn () => S.Continue (decl ctx d, ()),
adamc@26 273 bind = bind} ctx ds () of
adamc@26 274 S.Continue (ds, ()) => ds
adamc@26 275 | S.Return _ => raise Fail "FlatUtil.File.mapB: Impossible"
adamc@26 276
adamc@26 277 fun fold {typ, exp, decl} s d =
adamc@26 278 case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26 279 exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@26 280 decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@26 281 S.Continue (_, s) => s
adamc@26 282 | S.Return _ => raise Fail "FlatUtil.File.fold: Impossible"
adamc@26 283
adamc@26 284 end
adamc@26 285
adamc@26 286 end