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annotate src/mono_util.sml @ 321:cd4cabaf3e52

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Fix memory management bug
author Adam Chlipala <adamc@hcoop.net>
date Thu, 11 Sep 2008 12:12:22 -0400
parents 52d4c60518d4
children e976b187d73a
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 MonoUtil :> MONO_UTIL = struct
adamc@26 29
adamc@26 30 open Mono
adamc@26 31
adamc@26 32 structure S = Search
adamc@26 33
adamc@267 34 val dummyt = (TRecord [], ErrorMsg.dummySpan)
adamc@267 35
adamc@26 36 structure Typ = struct
adamc@26 37
adamc@193 38 open Order
adamc@109 39
adamc@109 40 fun compare ((t1, _), (t2, _)) =
adamc@109 41 case (t1, t2) of
adamc@109 42 (TFun (d1, r1), TFun (d2, r2)) =>
adamc@109 43 join (compare (d1, d2), fn () => compare (r1, r2))
adamc@109 44 | (TRecord xts1, TRecord xts2) =>
adamc@109 45 let
adamc@109 46 val xts1 = sortFields xts1
adamc@109 47 val xts2 = sortFields xts2
adamc@109 48 in
adamc@109 49 joinL compareFields (xts1, xts2)
adamc@109 50 end
adamc@196 51 | (TDatatype (n1, _), TDatatype (n2, _)) => Int.compare (n1, n2)
adamc@109 52 | (TFfi (m1, x1), TFfi (m2, x2)) => join (String.compare (m1, m2), fn () => String.compare (x1, x2))
adamc@288 53 | (TOption t1, TOption t2) => compare (t1, t2)
adamc@109 54
adamc@109 55 | (TFun _, _) => LESS
adamc@109 56 | (_, TFun _) => GREATER
adamc@109 57
adamc@109 58 | (TRecord _, _) => LESS
adamc@109 59 | (_, TRecord _) => GREATER
adamc@109 60
adamc@168 61 | (TDatatype _, _) => LESS
adamc@168 62 | (_, TDatatype _) => GREATER
adamc@109 63
adamc@288 64 | (TFfi _, _) => LESS
adamc@288 65 | (_, TFfi _) => GREATER
adamc@288 66
adamc@109 67 and compareFields ((x1, t1), (x2, t2)) =
adamc@109 68 join (String.compare (x1, x2),
adamc@109 69 fn () => compare (t1, t2))
adamc@109 70
adamc@109 71 and sortFields xts = ListMergeSort.sort (fn (x, y) => compareFields (x, y) = GREATER) xts
adamc@109 72
adamc@26 73 fun mapfold fc =
adamc@26 74 let
adamc@26 75 fun mft c acc =
adamc@26 76 S.bindP (mft' c acc, fc)
adamc@26 77
adamc@26 78 and mft' (cAll as (c, loc)) =
adamc@26 79 case c of
adamc@26 80 TFun (t1, t2) =>
adamc@26 81 S.bind2 (mft t1,
adamc@26 82 fn t1' =>
adamc@26 83 S.map2 (mft t2,
adamc@26 84 fn t2' =>
adamc@26 85 (TFun (t1', t2'), loc)))
adamc@26 86 | TRecord xts =>
adamc@26 87 S.map2 (ListUtil.mapfold (fn (x, t) =>
adamc@26 88 S.map2 (mft t,
adamc@26 89 fn t' =>
adamc@26 90 (x, t')))
adamc@26 91 xts,
adamc@26 92 fn xts' => (TRecord xts', loc))
adamc@168 93 | TDatatype _ => S.return2 cAll
adamc@51 94 | TFfi _ => S.return2 cAll
adamc@288 95 | TOption t =>
adamc@288 96 S.map2 (mft t,
adamc@288 97 fn t' =>
adamc@288 98 (TOption t, loc))
adamc@26 99 in
adamc@26 100 mft
adamc@26 101 end
adamc@26 102
adamc@26 103 fun map typ c =
adamc@26 104 case mapfold (fn c => fn () => S.Continue (typ c, ())) c () of
adamc@26 105 S.Return () => raise Fail "Mono_util.Typ.map"
adamc@26 106 | S.Continue (c, ()) => c
adamc@26 107
adamc@26 108 fun fold typ s c =
adamc@26 109 case mapfold (fn c => fn s => S.Continue (c, typ (c, s))) c s of
adamc@26 110 S.Continue (_, s) => s
adamc@26 111 | S.Return _ => raise Fail "MonoUtil.Typ.fold: Impossible"
adamc@26 112
adamc@26 113 fun exists typ k =
adamc@26 114 case mapfold (fn c => fn () =>
adamc@26 115 if typ c then
adamc@26 116 S.Return ()
adamc@26 117 else
adamc@26 118 S.Continue (c, ())) k () of
adamc@26 119 S.Return _ => true
adamc@26 120 | S.Continue _ => false
adamc@26 121
adamc@26 122 end
adamc@26 123
adamc@26 124 structure Exp = struct
adamc@26 125
adamc@26 126 datatype binder =
adamc@168 127 Datatype of string * int * (string * int * typ option) list
adamc@26 128 | RelE of string * typ
adamc@109 129 | NamedE of string * int * typ * exp option * string
adamc@26 130
adamc@26 131 fun mapfoldB {typ = fc, exp = fe, bind} =
adamc@26 132 let
adamc@26 133 val mft = Typ.mapfold fc
adamc@26 134
adamc@26 135 fun mfe ctx e acc =
adamc@26 136 S.bindP (mfe' ctx e acc, fe ctx)
adamc@26 137
adamc@26 138 and mfe' ctx (eAll as (e, loc)) =
adamc@26 139 case e of
adamc@26 140 EPrim _ => S.return2 eAll
adamc@26 141 | ERel _ => S.return2 eAll
adamc@26 142 | ENamed _ => S.return2 eAll
adamc@188 143 | ECon (_, _, NONE) => S.return2 eAll
adamc@188 144 | ECon (dk, n, SOME e) =>
adamc@178 145 S.map2 (mfe ctx e,
adamc@178 146 fn e' =>
adamc@188 147 (ECon (dk, n, SOME e'), loc))
adamc@297 148 | ENone t =>
adamc@297 149 S.map2 (mft t,
adamc@297 150 fn t' =>
adamc@297 151 (ENone t', loc))
adamc@290 152 | ESome (t, e) =>
adamc@290 153 S.bind2 (mft t,
adamc@290 154 fn t' =>
adamc@290 155 S.map2 (mfe ctx e,
adamc@290 156 fn e' =>
adamc@290 157 (ESome (t', e'), loc)))
adamc@51 158 | EFfi _ => S.return2 eAll
adamc@51 159 | EFfiApp (m, x, es) =>
adamc@51 160 S.map2 (ListUtil.mapfold (fn e => mfe ctx e) es,
adamc@51 161 fn es' =>
adamc@51 162 (EFfiApp (m, x, es'), loc))
adamc@26 163 | EApp (e1, e2) =>
adamc@26 164 S.bind2 (mfe ctx e1,
adamc@26 165 fn e1' =>
adamc@26 166 S.map2 (mfe ctx e2,
adamc@26 167 fn e2' =>
adamc@26 168 (EApp (e1', e2'), loc)))
adamc@26 169 | EAbs (x, dom, ran, e) =>
adamc@26 170 S.bind2 (mft dom,
adamc@26 171 fn dom' =>
adamc@26 172 S.bind2 (mft ran,
adamc@26 173 fn ran' =>
adamc@26 174 S.map2 (mfe (bind (ctx, RelE (x, dom'))) e,
adamc@26 175 fn e' =>
adamc@26 176 (EAbs (x, dom', ran', e'), loc))))
adamc@26 177
adamc@26 178 | ERecord xes =>
adamc@29 179 S.map2 (ListUtil.mapfold (fn (x, e, t) =>
adamc@29 180 S.bind2 (mfe ctx e,
adamc@26 181 fn e' =>
adamc@29 182 S.map2 (mft t,
adamc@29 183 fn t' =>
adamc@29 184 (x, e', t'))))
adamc@26 185 xes,
adamc@26 186 fn xes' =>
adamc@26 187 (ERecord xes', loc))
adamc@26 188 | EField (e, x) =>
adamc@26 189 S.map2 (mfe ctx e,
adamc@26 190 fn e' =>
adamc@26 191 (EField (e', x), loc))
adamc@94 192
adamc@182 193 | ECase (e, pes, {disc, result}) =>
adamc@178 194 S.bind2 (mfe ctx e,
adamc@178 195 fn e' =>
adamc@178 196 S.bind2 (ListUtil.mapfold (fn (p, e) =>
adamc@179 197 let
adamc@179 198 fun pb ((p, _), ctx) =
adamc@179 199 case p of
adamc@179 200 PWild => ctx
adamc@182 201 | PVar (x, t) => bind (ctx, RelE (x, t))
adamc@179 202 | PPrim _ => ctx
adamc@188 203 | PCon (_, _, NONE) => ctx
adamc@188 204 | PCon (_, _, SOME p) => pb (p, ctx)
adamc@182 205 | PRecord xps => foldl (fn ((_, p, _), ctx) =>
adamc@179 206 pb (p, ctx)) ctx xps
adamc@288 207 | PNone _ => ctx
adamc@288 208 | PSome (_, p) => pb (p, ctx)
adamc@179 209 in
adamc@179 210 S.map2 (mfe (pb (p, ctx)) e,
adamc@179 211 fn e' => (p, e'))
adamc@179 212 end) pes,
adamc@178 213 fn pes' =>
adamc@182 214 S.bind2 (mft disc,
adamc@182 215 fn disc' =>
adamc@182 216 S.map2 (mft result,
adamc@182 217 fn result' =>
adamc@182 218 (ECase (e', pes', {disc = disc', result = result'}), loc)))))
adamc@178 219
adamc@283 220 | EError (e, t) =>
adamc@283 221 S.bind2 (mfe ctx e,
adamc@283 222 fn e' =>
adamc@283 223 S.map2 (mft t,
adamc@283 224 fn t' =>
adamc@283 225 (EError (e', t'), loc)))
adamc@283 226
adamc@94 227 | EStrcat (e1, e2) =>
adamc@94 228 S.bind2 (mfe ctx e1,
adamc@94 229 fn e1' =>
adamc@94 230 S.map2 (mfe ctx e2,
adamc@94 231 fn e2' =>
adamc@94 232 (EStrcat (e1', e2'), loc)))
adamc@102 233
adamc@102 234 | EWrite e =>
adamc@102 235 S.map2 (mfe ctx e,
adamc@102 236 fn e' =>
adamc@102 237 (EWrite e', loc))
adamc@106 238
adamc@106 239 | ESeq (e1, e2) =>
adamc@106 240 S.bind2 (mfe ctx e1,
adamc@106 241 fn e1' =>
adamc@106 242 S.map2 (mfe ctx e2,
adamc@106 243 fn e2' =>
adamc@106 244 (ESeq (e1', e2'), loc)))
adamc@251 245 | ELet (x, t, e1, e2) =>
adamc@251 246 S.bind2 (mft t,
adamc@251 247 fn t' =>
adamc@251 248 S.bind2 (mfe ctx e1,
adamc@251 249 fn e1' =>
adamc@252 250 S.map2 (mfe (bind (ctx, RelE (x, t'))) e2,
adamc@251 251 fn e2' =>
adamc@251 252 (ELet (x, t', e1', e2'), loc))))
adamc@111 253
adamc@111 254 | EClosure (n, es) =>
adamc@111 255 S.map2 (ListUtil.mapfold (mfe ctx) es,
adamc@111 256 fn es' =>
adamc@111 257 (EClosure (n, es'), loc))
adamc@252 258
adamc@252 259 | EQuery {exps, tables, state, query, body, initial} =>
adamc@252 260 S.bind2 (ListUtil.mapfold (fn (x, t) =>
adamc@252 261 S.map2 (mft t,
adamc@252 262 fn t' => (x, t'))) exps,
adamc@252 263 fn exps' =>
adamc@252 264 S.bind2 (ListUtil.mapfold (fn (x, xts) =>
adamc@252 265 S.map2 (ListUtil.mapfold
adamc@252 266 (fn (x, t) =>
adamc@252 267 S.map2 (mft t,
adamc@252 268 fn t' => (x, t'))) xts,
adamc@252 269 fn xts' => (x, xts'))) tables,
adamc@252 270 fn tables' =>
adamc@252 271 S.bind2 (mft state,
adamc@252 272 fn state' =>
adamc@252 273 S.bind2 (mfe ctx query,
adamc@252 274 fn query' =>
adamc@267 275 S.bind2 (mfe (bind (bind (ctx, RelE ("r", dummyt)),
adamc@267 276 RelE ("acc", dummyt)))
adamc@267 277 body,
adamc@267 278 fn body' =>
adamc@267 279 S.map2 (mfe ctx initial,
adamc@267 280 fn initial' =>
adamc@267 281 (EQuery {exps = exps',
adamc@267 282 tables = tables',
adamc@267 283 state = state',
adamc@267 284 query = query',
adamc@267 285 body = body',
adamc@267 286 initial = initial'},
adamc@267 287 loc)))))))
adamc@307 288
adamc@307 289 | EDml e =>
adamc@307 290 S.map2 (mfe ctx e,
adamc@307 291 fn e' =>
adamc@307 292 (EDml e', loc))
adamc@26 293 in
adamc@26 294 mfe
adamc@26 295 end
adamc@26 296
adamc@26 297 fun mapfold {typ = fc, exp = fe} =
adamc@26 298 mapfoldB {typ = fc,
adamc@26 299 exp = fn () => fe,
adamc@26 300 bind = fn ((), _) => ()} ()
adamc@26 301
adamc@26 302 fun mapB {typ, exp, bind} ctx e =
adamc@26 303 case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26 304 exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@26 305 bind = bind} ctx e () of
adamc@26 306 S.Continue (e, ()) => e
adamc@26 307 | S.Return _ => raise Fail "MonoUtil.Exp.mapB: Impossible"
adamc@26 308
adamc@26 309 fun map {typ, exp} e =
adamc@26 310 case mapfold {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26 311 exp = fn e => fn () => S.Continue (exp e, ())} e () of
adamc@26 312 S.Return () => raise Fail "Mono_util.Exp.map"
adamc@26 313 | S.Continue (e, ()) => e
adamc@26 314
adamc@26 315 fun fold {typ, exp} s e =
adamc@26 316 case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26 317 exp = fn e => fn s => S.Continue (e, exp (e, s))} e s of
adamc@26 318 S.Continue (_, s) => s
adamc@26 319 | S.Return _ => raise Fail "MonoUtil.Exp.fold: Impossible"
adamc@26 320
adamc@26 321 fun exists {typ, exp} k =
adamc@26 322 case mapfold {typ = fn c => fn () =>
adamc@26 323 if typ c then
adamc@26 324 S.Return ()
adamc@26 325 else
adamc@26 326 S.Continue (c, ()),
adamc@26 327 exp = fn e => fn () =>
adamc@26 328 if exp e then
adamc@26 329 S.Return ()
adamc@26 330 else
adamc@26 331 S.Continue (e, ())} k () of
adamc@26 332 S.Return _ => true
adamc@26 333 | S.Continue _ => false
adamc@26 334
adamc@26 335 end
adamc@26 336
adamc@26 337 structure Decl = struct
adamc@26 338
adamc@26 339 datatype binder = datatype Exp.binder
adamc@26 340
adamc@26 341 fun mapfoldB {typ = fc, exp = fe, decl = fd, bind} =
adamc@26 342 let
adamc@26 343 val mft = Typ.mapfold fc
adamc@26 344
adamc@26 345 val mfe = Exp.mapfoldB {typ = fc, exp = fe, bind = bind}
adamc@26 346
adamc@26 347 fun mfd ctx d acc =
adamc@26 348 S.bindP (mfd' ctx d acc, fd ctx)
adamc@26 349
adamc@26 350 and mfd' ctx (dAll as (d, loc)) =
adamc@26 351 case d of
adamc@164 352 DDatatype (x, n, xncs) =>
adamc@164 353 S.map2 (ListUtil.mapfold (fn (x, n, c) =>
adamc@164 354 case c of
adamc@164 355 NONE => S.return2 (x, n, c)
adamc@164 356 | SOME c =>
adamc@164 357 S.map2 (mft c,
adamc@164 358 fn c' => (x, n, SOME c'))) xncs,
adamc@164 359 fn xncs' =>
adamc@164 360 (DDatatype (x, n, xncs'), loc))
adamc@164 361 | DVal vi =>
adamc@126 362 S.map2 (mfvi ctx vi,
adamc@126 363 fn vi' =>
adamc@126 364 (DVal vi', loc))
adamc@126 365 | DValRec vis =>
adamc@196 366 let
adamc@196 367 val ctx' = foldl (fn ((x, n, t, _, s), ctx') => bind (ctx', NamedE (x, n, t, NONE, s))) ctx vis
adamc@196 368 in
adamc@196 369 S.map2 (ListUtil.mapfold (mfvi ctx') vis,
adamc@196 370 fn vis' =>
adamc@196 371 (DValRec vis', loc))
adamc@196 372 end
adamc@144 373 | DExport (ek, s, n, ts) =>
adamc@120 374 S.map2 (ListUtil.mapfold mft ts,
adamc@120 375 fn ts' =>
adamc@144 376 (DExport (ek, s, n, ts'), loc))
adamc@273 377 | DTable _ => S.return2 dAll
adamc@271 378 | DDatabase _ => S.return2 dAll
adamc@126 379
adamc@126 380 and mfvi ctx (x, n, t, e, s) =
adamc@126 381 S.bind2 (mft t,
adamc@126 382 fn t' =>
adamc@126 383 S.map2 (mfe ctx e,
adamc@126 384 fn e' =>
adamc@126 385 (x, n, t', e', s)))
adamc@26 386 in
adamc@26 387 mfd
adamc@26 388 end
adamc@26 389
adamc@26 390 fun mapfold {typ = fc, exp = fe, decl = fd} =
adamc@26 391 mapfoldB {typ = fc,
adamc@26 392 exp = fn () => fe,
adamc@26 393 decl = fn () => fd,
adamc@26 394 bind = fn ((), _) => ()} ()
adamc@26 395
adamc@26 396 fun fold {typ, exp, decl} s d =
adamc@26 397 case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26 398 exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@26 399 decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@26 400 S.Continue (_, s) => s
adamc@26 401 | S.Return _ => raise Fail "MonoUtil.Decl.fold: Impossible"
adamc@26 402
adamc@26 403 end
adamc@26 404
adamc@26 405 structure File = struct
adamc@26 406
adamc@26 407 datatype binder = datatype Exp.binder
adamc@26 408
adamc@26 409 fun mapfoldB (all as {bind, ...}) =
adamc@26 410 let
adamc@26 411 val mfd = Decl.mapfoldB all
adamc@26 412
adamc@26 413 fun mff ctx ds =
adamc@26 414 case ds of
adamc@26 415 nil => S.return2 nil
adamc@26 416 | d :: ds' =>
adamc@26 417 S.bind2 (mfd ctx d,
adamc@26 418 fn d' =>
adamc@26 419 let
adamc@100 420 val ctx' =
adamc@26 421 case #1 d' of
adamc@164 422 DDatatype (x, n, xncs) =>
adamc@164 423 let
adamc@168 424 val ctx = bind (ctx, Datatype (x, n, xncs))
adamc@198 425 val t = (TDatatype (n, ref (ElabUtil.classifyDatatype xncs, xncs)), #2 d')
adamc@164 426 in
adamc@164 427 foldl (fn ((x, n, to), ctx) =>
adamc@164 428 let
adamc@164 429 val t = case to of
adamc@164 430 NONE => t
adamc@164 431 | SOME t' => (TFun (t', t), #2 d')
adamc@164 432 in
adamc@164 433 bind (ctx, NamedE (x, n, t, NONE, ""))
adamc@164 434 end)
adamc@164 435 ctx xncs
adamc@164 436 end
adamc@164 437 | DVal (x, n, t, e, s) => bind (ctx, NamedE (x, n, t, SOME e, s))
adamc@126 438 | DValRec vis => foldl (fn ((x, n, t, e, s), ctx) =>
adamc@196 439 bind (ctx, NamedE (x, n, t, NONE, s))) ctx vis
adamc@109 440 | DExport _ => ctx
adamc@273 441 | DTable _ => ctx
adamc@271 442 | DDatabase _ => ctx
adamc@26 443 in
adamc@26 444 S.map2 (mff ctx' ds',
adamc@26 445 fn ds' =>
adamc@26 446 d' :: ds')
adamc@26 447 end)
adamc@26 448 in
adamc@26 449 mff
adamc@26 450 end
adamc@26 451
adamc@26 452 fun mapfold {typ = fc, exp = fe, decl = fd} =
adamc@26 453 mapfoldB {typ = fc,
adamc@26 454 exp = fn () => fe,
adamc@26 455 decl = fn () => fd,
adamc@26 456 bind = fn ((), _) => ()} ()
adamc@26 457
adamc@26 458 fun mapB {typ, exp, decl, bind} ctx ds =
adamc@26 459 case mapfoldB {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@26 460 exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()),
adamc@26 461 decl = fn ctx => fn d => fn () => S.Continue (decl ctx d, ()),
adamc@26 462 bind = bind} ctx ds () of
adamc@26 463 S.Continue (ds, ()) => ds
adamc@26 464 | S.Return _ => raise Fail "MonoUtil.File.mapB: Impossible"
adamc@26 465
adamc@96 466 fun map {typ, exp, decl} e =
adamc@96 467 case mapfold {typ = fn c => fn () => S.Continue (typ c, ()),
adamc@96 468 exp = fn e => fn () => S.Continue (exp e, ()),
adamc@96 469 decl = fn d => fn () => S.Continue (decl d, ())} e () of
adamc@96 470 S.Return () => raise Fail "Mono_util.File.map"
adamc@96 471 | S.Continue (e, ()) => e
adamc@96 472
adamc@26 473 fun fold {typ, exp, decl} s d =
adamc@26 474 case mapfold {typ = fn c => fn s => S.Continue (c, typ (c, s)),
adamc@26 475 exp = fn e => fn s => S.Continue (e, exp (e, s)),
adamc@26 476 decl = fn d => fn s => S.Continue (d, decl (d, s))} d s of
adamc@26 477 S.Continue (_, s) => s
adamc@26 478 | S.Return _ => raise Fail "MonoUtil.File.fold: Impossible"
adamc@26 479
adamc@26 480 end
adamc@26 481
adamc@26 482 end