Mercurial > urweb

annotate src/mono_reduce.sml @ 2150:763ccca119bc

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
location literal _LOC_
author Gabriel Riba Faura <griba2001@gmail.com>
date Wed, 03 Jun 2015 08:34:23 +0200
parents ec1614fb97bb
children 25874084bf1f
rev   line source
adam@2040 1 (* Copyright (c) 2008, 2013-2014, Adam Chlipala
adamc@133 2 * All rights reserved.
adamc@133 3 *
adamc@133 4 * Redistribution and use in source and binary forms, with or without
adamc@133 5 * modification, are permitted provided that the following conditions are met:
adamc@133 6 *
adamc@133 7 * - Redistributions of source code must retain the above copyright notice,
adamc@133 8 * this list of conditions and the following disclaimer.
adamc@133 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@133 10 * this list of conditions and the following disclaimer in the documentation
adamc@133 11 * and/or other materials provided with the distribution.
adamc@133 12 * - The names of contributors may not be used to endorse or promote products
adamc@133 13 * derived from this software without specific prior written permission.
adamc@133 14 *
adamc@133 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@133 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@133 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@133 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@133 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@133 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@133 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@133 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@133 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@133 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@133 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@133 26 *)
adamc@133 27
adamc@133 28 (* Simplify a Mono program algebraically *)
adamc@133 29
adamc@133 30 structure MonoReduce :> MONO_REDUCE = struct
adamc@133 31
adamc@133 32 open Mono
adamc@133 33
adam@1852 34 val fullMode = ref false
adam@1852 35
adamc@133 36 structure E = MonoEnv
adamc@133 37 structure U = MonoUtil
adamc@133 38
adamc@470 39 structure IM = IntBinaryMap
adamc@916 40 structure IS = IntBinarySet
adamc@470 41
adam@2084 42 structure SS = BinarySetFn(struct
adam@2084 43 type ord_key = string
adam@2084 44 val compare = String.compare
adam@2084 45 end)
adamc@133 46
adamc@948 47 fun simpleTypeImpure tsyms =
adamc@919 48 U.Typ.exists (fn TFun _ => true
adamc@948 49 | TDatatype (n, _) => IS.member (tsyms, n)
adamc@919 50 | _ => false)
adamc@919 51
adam@1963 52 fun simpleImpure isGlobal (tsyms, syms) =
adamc@919 53 U.Exp.existsB {typ = fn _ => false,
adamc@919 54 exp = fn (env, e) =>
adamc@919 55 case e of
adamc@919 56 EWrite _ => true
adamc@919 57 | EQuery _ => true
adamc@919 58 | EDml _ => true
adamc@919 59 | ENextval _ => true
adamc@1073 60 | ESetval _ => true
adamc@1171 61 | EFfiApp (m, x, _) => Settings.isEffectful (m, x) orelse Settings.isBenignEffectful (m, x)
adamc@919 62 | EServerCall _ => true
adamc@919 63 | ERecv _ => true
adamc@919 64 | ESleep _ => true
adamc@919 65 | ENamed n => IS.member (syms, n)
adamc@919 66 | ERel n =>
adamc@919 67 let
adamc@919 68 val (_, t, _) = E.lookupERel env n
adamc@919 69 in
adamc@948 70 simpleTypeImpure tsyms t
adamc@919 71 end
adam@1963 72 | EApp _ => not isGlobal
adamc@919 73 | _ => false,
adamc@919 74 bind = fn (env, b) =>
adamc@919 75 case b of
adamc@919 76 U.Exp.RelE (x, t) => E.pushERel env x t NONE
adamc@919 77 | _ => env}
adamc@916 78
adamc@252 79 fun impure (e, _) =
adamc@252 80 case e of
adamc@252 81 EWrite _ => true
adamc@252 82 | EQuery _ => true
adamc@307 83 | EDml _ => true
adamc@338 84 | ENextval _ => true
adamc@1073 85 | ESetval _ => true
adam@1423 86 | EUnurlify (e, _, _) => impure e
adamc@252 87 | EAbs _ => false
adamc@252 88
adamc@252 89 | EPrim _ => false
adamc@252 90 | ERel _ => false
adamc@252 91 | ENamed _ => false
adamc@252 92 | ECon (_, _, eo) => (case eo of NONE => false | SOME e => impure e)
adamc@297 93 | ENone _ => false
adamc@290 94 | ESome (_, e) => impure e
adamc@252 95 | EFfi _ => false
adamc@1171 96 | EFfiApp (m, x, _) => Settings.isEffectful (m, x) orelse Settings.isBenignEffectful (m, x)
adamc@252 97 | EApp ((EFfi _, _), _) => false
adamc@252 98 | EApp _ => true
adamc@252 99
adamc@387 100 | EUnop (_, e) => impure e
adam@1360 101 | EBinop (_, _, e1, e2) => impure e1 orelse impure e2
adamc@387 102
adamc@252 103 | ERecord xes => List.exists (fn (_, e, _) => impure e) xes
adamc@252 104 | EField (e, _) => impure e
adamc@252 105
adamc@252 106 | ECase (e, pes, _) => impure e orelse List.exists (fn (_, e) => impure e) pes
adamc@252 107
adamc@1069 108 | EError _ => true
adam@1932 109 | EReturnBlob {blob = NONE, mimeType = e2, ...} => impure e2
adam@1932 110 | EReturnBlob {blob = SOME e1, mimeType = e2, ...} => impure e1 orelse impure e2
adamc@1065 111 | ERedirect (e, _) => impure e
adamc@283 112
adamc@252 113 | EStrcat (e1, e2) => impure e1 orelse impure e2
adamc@252 114
adamc@252 115 | ESeq (e1, e2) => impure e1 orelse impure e2
adamc@252 116 | ELet (_, _, e1, e2) => impure e1 orelse impure e2
adamc@252 117
adamc@252 118 | EClosure (_, es) => List.exists impure es
adamc@815 119 | EJavaScript (_, e) => impure e
adamc@568 120 | ESignalReturn e => impure e
adamc@572 121 | ESignalBind (e1, e2) => impure e1 orelse impure e2
adamc@574 122 | ESignalSource e => impure e
adamc@608 123 | EServerCall _ => true
adamc@670 124 | ERecv _ => true
adamc@695 125 | ESleep _ => true
adamc@1021 126 | ESpawn _ => true
adamc@252 127
adamc@252 128 val liftExpInExp = Monoize.liftExpInExp
adamc@252 129
adamc@829 130 fun multiLift n e =
adamc@829 131 case n of
adamc@829 132 0 => e
adamc@829 133 | _ => multiLift (n - 1) (liftExpInExp 0 e)
adamc@829 134
adamc@252 135 val subExpInExp' =
adamc@133 136 U.Exp.mapB {typ = fn t => t,
adamc@133 137 exp = fn (xn, rep) => fn e =>
adamc@133 138 case e of
adamc@133 139 ERel xn' =>
adamc@133 140 (case Int.compare (xn', xn) of
adamc@133 141 EQUAL => #1 rep
adamc@133 142 | GREATER=> ERel (xn' - 1)
adamc@133 143 | LESS => e)
adamc@133 144 | _ => e,
adamc@133 145 bind = fn ((xn, rep), U.Exp.RelE _) => (xn+1, liftExpInExp 0 rep)
adamc@133 146 | (ctx, _) => ctx}
adamc@133 147
adamc@252 148 fun subExpInExp (n, e1) e2 =
adamc@252 149 let
adamc@252 150 val r = subExpInExp' (n, e1) e2
adamc@252 151 in
adamc@252 152 (*Print.prefaces "subExpInExp" [("e1", MonoPrint.p_exp MonoEnv.empty e1),
adamc@252 153 ("e2", MonoPrint.p_exp MonoEnv.empty e2),
adamc@252 154 ("r", MonoPrint.p_exp MonoEnv.empty r)];*)
adamc@252 155 r
adamc@252 156 end
adamc@133 157
adamc@133 158 fun typ c = c
adamc@133 159
adamc@316 160 val swapExpVars =
adamc@316 161 U.Exp.mapB {typ = fn t => t,
adamc@316 162 exp = fn lower => fn e =>
adamc@316 163 case e of
adamc@316 164 ERel xn =>
adamc@316 165 if xn = lower then
adamc@316 166 ERel (lower + 1)
adamc@316 167 else if xn = lower + 1 then
adamc@316 168 ERel lower
adamc@316 169 else
adamc@316 170 e
adamc@316 171 | _ => e,
adamc@316 172 bind = fn (lower, U.Exp.RelE _) => lower+1
adamc@316 173 | (lower, _) => lower}
adamc@316 174
adamc@341 175 val swapExpVarsPat =
adamc@341 176 U.Exp.mapB {typ = fn t => t,
adamc@341 177 exp = fn (lower, len) => fn e =>
adamc@341 178 case e of
adamc@341 179 ERel xn =>
adamc@341 180 if xn = lower then
adamc@827 181 ERel (lower + len)
adamc@341 182 else if xn >= lower + 1 andalso xn < lower + 1 + len then
adamc@341 183 ERel (xn - 1)
adamc@341 184 else
adamc@341 185 e
adamc@341 186 | _ => e,
adamc@341 187 bind = fn ((lower, len), U.Exp.RelE _) => (lower+1, len)
adamc@341 188 | (st, _) => st}
adamc@341 189
adam@1817 190 datatype result = Yes of (string * typ * exp) list | No | Maybe
adamc@258 191
adamc@183 192 fun match (env, p : pat, e : exp) =
adamc@183 193 case (#1 p, #1 e) of
adamc@258 194 (PWild, _) => Yes env
adam@1817 195 | (PVar (x, t), _) => Yes ((x, t, e) :: env)
adamc@183 196
adam@2048 197 | (PPrim (Prim.String (_, s)), EStrcat ((EPrim (Prim.String (_, s')), _), _)) =>
adamc@280 198 if String.isPrefix s' s then
adamc@280 199 Maybe
adamc@280 200 else
adamc@280 201 No
adamc@280 202
adam@2048 203 | (PPrim (Prim.String (_, s)), EStrcat (_, (EPrim (Prim.String (_, s')), _))) =>
adamc@1207 204 if String.isSuffix s' s then
adamc@1207 205 Maybe
adamc@1207 206 else
adamc@1207 207 No
adamc@1207 208
adamc@183 209 | (PPrim p, EPrim p') =>
adamc@183 210 if Prim.equal (p, p') then
adamc@258 211 Yes env
adamc@183 212 else
adamc@258 213 No
adamc@183 214
adam@2082 215 | (PPrim (Prim.String (_, s)), _) =>
adam@2082 216 let
adam@2082 217 fun lengthLb (e : exp) =
adam@2082 218 case #1 e of
adam@2082 219 EStrcat (e1, e2) => lengthLb e1 + lengthLb e2
adam@2082 220 | EPrim (Prim.String (_, s)) => size s
adam@2082 221 | _ => 0
adam@2082 222 in
adam@2082 223 if lengthLb e > size s then
adam@2082 224 No
adam@2082 225 else
adam@2082 226 Maybe
adam@2082 227 end
adam@2082 228
kkallio@1489 229 | (PCon (_, PConVar n1, po), ECon (_, PConVar n2, eo)) =>
adamc@183 230 if n1 = n2 then
kkallio@1489 231 case (po, eo) of
kkallio@1489 232 (NONE, NONE) => Yes env
kkallio@1489 233 | (SOME p, SOME e) => match (env, p, e)
kkallio@1489 234 | _ => Maybe
adamc@183 235 else
adamc@258 236 No
adamc@183 237
adamc@188 238 | (PCon (_, PConFfi {mod = m1, con = con1, ...}, NONE), ECon (_, PConFfi {mod = m2, con = con2, ...}, NONE)) =>
adamc@185 239 if m1 = m2 andalso con1 = con2 then
adamc@258 240 Yes env
adamc@185 241 else
adamc@258 242 No
adamc@185 243
adamc@188 244 | (PCon (_, PConFfi {mod = m1, con = con1, ...}, SOME ep), ECon (_, PConFfi {mod = m2, con = con2, ...}, SOME e)) =>
adamc@185 245 if m1 = m2 andalso con1 = con2 then
adamc@185 246 match (env, p, e)
adamc@185 247 else
adamc@258 248 No
adamc@185 249
adamc@183 250 | (PRecord xps, ERecord xes) =>
adamc@183 251 let
adamc@183 252 fun consider (xps, env) =
adamc@183 253 case xps of
adamc@258 254 [] => Yes env
adamc@183 255 | (x, p, _) :: rest =>
adamc@183 256 case List.find (fn (x', _, _) => x' = x) xes of
adamc@258 257 NONE => No
adamc@183 258 | SOME (_, e, _) =>
adamc@183 259 case match (env, p, e) of
adamc@258 260 No => No
adamc@258 261 | Maybe => Maybe
adamc@258 262 | Yes env => consider (rest, env)
adamc@183 263 in
adamc@183 264 consider (xps, env)
adamc@183 265 end
adamc@183 266
adamc@726 267 | (PNone _, ENone _) => Yes env
adamc@921 268 | (PNone _, ESome _) => No
adamc@726 269 | (PSome (_, p), ESome (_, e)) => match (env, p, e)
adamc@921 270 | (PSome _, ENone _) => No
adamc@726 271
adamc@258 272 | _ => Maybe
adamc@183 273
adamc@318 274 datatype event =
adamc@318 275 WritePage
adamc@318 276 | ReadDb
adamc@318 277 | WriteDb
adamc@1225 278 | ReadCookie
adamc@1225 279 | WriteCookie
adamc@481 280 | UseRel
adamc@318 281 | Unsure
adamc@1225 282 | Abort
adamc@318 283
adamc@318 284 fun p_event e =
adamc@318 285 let
adamc@318 286 open Print.PD
adamc@318 287 in
adamc@318 288 case e of
adamc@318 289 WritePage => string "WritePage"
adamc@318 290 | ReadDb => string "ReadDb"
adamc@318 291 | WriteDb => string "WriteDb"
adamc@1225 292 | ReadCookie => string "ReadCookie"
adamc@1225 293 | WriteCookie => string "WriteCookie"
adamc@481 294 | UseRel => string "UseRel"
adamc@318 295 | Unsure => string "Unsure"
adamc@1225 296 | Abort => string "Abort"
adamc@318 297 end
adamc@318 298
adamc@470 299 val p_events = Print.p_list p_event
adamc@470 300
adamc@318 301 fun patBinds (p, _) =
adamc@318 302 case p of
adamc@318 303 PWild => 0
adamc@318 304 | PVar _ => 1
adamc@318 305 | PPrim _ => 0
adamc@318 306 | PCon (_, _, NONE) => 0
adamc@318 307 | PCon (_, _, SOME p) => patBinds p
adamc@318 308 | PRecord xpts => foldl (fn ((_, p, _), n) => n + patBinds p) 0 xpts
adamc@318 309 | PNone _ => 0
adamc@318 310 | PSome (_, p) => patBinds p
adamc@318 311
adamc@932 312 val countFree = U.Exp.foldB {typ = fn (_, n) => n,
adamc@932 313 exp = fn (x, e, n) =>
adamc@932 314 case e of
adamc@932 315 ERel x' => if x = x' then n + 1 else n
adamc@932 316 | _ => n,
adamc@932 317 bind = fn (n, b) =>
adamc@932 318 case b of
adamc@932 319 U.Exp.RelE _ => n + 1
adamc@975 320 | _ => n}
adamc@975 321
adamc@975 322 val freeInAbs = U.Exp.existsB {typ = fn _ => false,
adamc@975 323 exp = fn (n, e) =>
adamc@975 324 case e of
adamc@975 325 EAbs (_, _, _, b) => countFree n 0 b > 0
adamc@975 326 | EJavaScript (_, b) => countFree n 0 b > 0
adamc@975 327 | _ => false,
adamc@975 328 bind = fn (n, b) =>
adamc@975 329 case b of
adamc@975 330 U.Exp.RelE _ => n + 1
adamc@975 331 | _ => n} 0
adamc@932 332
adam@2126 333 val yankedCase = ref false
adam@2126 334
adam@2126 335 fun reduce' (file : file) =
adamc@470 336 let
adamc@948 337 val (timpures, impures, absCounts) =
adamc@948 338 foldl (fn ((d, _), (timpures, impures, absCounts)) =>
adamc@916 339 let
adam@1820 340 fun countAbs env e =
adam@1820 341 case #1 e of
adam@1820 342 EAbs (x, t, _, e) => 1 + countAbs (E.pushERel env x t NONE) e
adam@1820 343 | _ =>
adam@1820 344 let
adam@1820 345 fun remaining e =
adam@1820 346 case #1 e of
adam@1820 347 ENamed n => IM.find (absCounts, n)
adam@1820 348 | EApp (e, arg) =>
adam@1963 349 if simpleImpure true (timpures, impures) env arg then
adam@1820 350 NONE
adam@1820 351 else
adam@1820 352 (case remaining e of
adam@1820 353 NONE => NONE
adam@1820 354 | SOME n => if n > 0 then
adam@1820 355 SOME (n - 1)
adam@1820 356 else
adam@1820 357 NONE)
adam@1820 358 | _ => NONE
adam@1820 359 in
adam@1820 360 getOpt (remaining e, 0)
adam@1820 361 end
adamc@916 362 in
adamc@916 363 case d of
adamc@948 364 DDatatype dts =>
adamc@948 365 (if List.exists (fn (_, _, cs) =>
adamc@948 366 List.exists (fn (_, _, NONE) => false
adamc@948 367 | (_, _, SOME t) => simpleTypeImpure timpures t) cs)
adamc@948 368 dts then
adamc@948 369 IS.addList (timpures, map #2 dts)
adamc@948 370 else
adamc@948 371 timpures,
adamc@948 372 impures,
adamc@948 373 absCounts)
adamc@948 374 | DVal (_, n, _, e, _) =>
adamc@948 375 (timpures,
adam@1963 376 if simpleImpure true (timpures, impures) E.empty e then
adamc@916 377 IS.add (impures, n)
adamc@916 378 else
adamc@916 379 impures,
adam@1820 380 IM.insert (absCounts, n, countAbs E.empty e))
adamc@916 381 | DValRec vis =>
adamc@948 382 (timpures,
adam@1963 383 if List.exists (fn (_, _, _, e, _) => simpleImpure true (timpures, impures) E.empty e) vis then
adamc@916 384 foldl (fn ((_, n, _, _, _), impures) =>
adamc@916 385 IS.add (impures, n)) impures vis
adamc@916 386 else
adamc@916 387 impures,
adamc@916 388 foldl (fn ((x, n, _, e, _), absCounts) =>
adam@1820 389 IM.insert (absCounts, n, countAbs E.empty e))
adamc@916 390 absCounts vis)
adamc@948 391 | _ => (timpures, impures, absCounts)
adamc@916 392 end)
adam@1845 393 (IS.empty, IS.empty, IM.empty) (#1 file)
adamc@387 394
adamc@1017 395 val uses = U.File.fold {typ = fn (_, m) => m,
adamc@1017 396 exp = fn (e, m) =>
adamc@1017 397 case e of
adamc@1017 398 ENamed n => IM.insert (m, n, 1 + Option.getOpt (IM.find (m, n), 0))
adamc@1017 399 | _ => m,
adamc@1017 400 decl = fn (_, m) => m}
adamc@1017 401 IM.empty file
adamc@1017 402
adamc@1017 403 val size = U.Exp.fold {typ = fn (_, n) => n,
adamc@1017 404 exp = fn (_, n) => n + 1} 0
adamc@1017 405
adam@1360 406 val functionInside' = U.Typ.exists (fn c => case c of
adam@1360 407 TFun _ => true
adam@1360 408 | _ => false)
adam@1360 409
adam@1360 410 fun functionInside t =
adam@1360 411 case #1 t of
adam@1360 412 TFun (t1, t2) => functionInside' t1 orelse functionInside t2
adam@1360 413 | _ => functionInside' t
adam@1360 414
adam@1393 415 fun mayInline (n, e, t, s) =
adamc@1017 416 case IM.find (uses, n) of
adamc@1017 417 NONE => false
adam@1966 418 | SOME count => not (Settings.checkNeverInline s)
adam@1966 419 andalso (count <= 1
adam@1966 420 orelse size e <= Settings.getMonoInline ()
adam@1966 421 orelse functionInside t
adam@1966 422 orelse Settings.checkAlwaysInline s)
adamc@1017 423
adamc@470 424 fun summarize d (e, _) =
adamc@579 425 let
adamc@579 426 val s =
adamc@579 427 case e of
adamc@579 428 EPrim _ => []
adamc@579 429 | ERel n => if n = d then [UseRel] else []
adamc@579 430 | ENamed _ => []
adamc@579 431 | ECon (_, _, NONE) => []
adamc@579 432 | ECon (_, _, SOME e) => summarize d e
adamc@579 433 | ENone _ => []
adamc@579 434 | ESome (_, e) => summarize d e
adamc@579 435 | EFfi _ => []
adam@1663 436 | EFfiApp ("Basis", "get_cookie", [(e, _)]) =>
adamc@1225 437 summarize d e @ [ReadCookie]
adam@1423 438 | EFfiApp ("Basis", "set_cookie", es) =>
adam@1663 439 List.concat (map (summarize d o #1) es) @ [WriteCookie]
adam@1423 440 | EFfiApp ("Basis", "clear_cookie", es) =>
adam@1663 441 List.concat (map (summarize d o #1) es) @ [WriteCookie]
adamc@765 442 | EFfiApp (m, x, es) =>
adamc@1171 443 if Settings.isEffectful (m, x) orelse Settings.isBenignEffectful (m, x) then
adam@1663 444 List.concat (map (summarize d o #1) es) @ [if m = "Basis" andalso String.isSuffix "_w" x then
adam@1663 445 WritePage
adam@1663 446 else
adam@1663 447 Unsure]
adamc@765 448 else
adam@1663 449 List.concat (map (summarize d o #1) es)
adamc@579 450 | EApp ((EFfi _, _), e) => summarize d e
adamc@579 451 | EApp _ =>
adamc@579 452 let
adamc@694 453 fun unravel (e, passed, ls) =
adamc@579 454 case e of
adamc@579 455 ENamed n =>
adamc@579 456 let
adamc@579 457 val ls = rev ls
adamc@579 458 in
adamc@948 459 if IS.member (impures, n) then
adamc@948 460 case IM.find (absCounts, n) of
adamc@948 461 NONE => [Unsure]
adamc@948 462 | SOME len =>
adamc@948 463 if passed < len then
adamc@948 464 ls
adamc@948 465 else
adamc@948 466 ls @ [Unsure]
adamc@948 467 else
adamc@948 468 ls
adamc@579 469 end
adamc@579 470 | ERel n => List.revAppend (ls,
adamc@579 471 if n = d then
adamc@579 472 [UseRel, Unsure]
adamc@579 473 else
adamc@579 474 [Unsure])
adamc@579 475 | EApp (f, x) =>
adamc@995 476 unravel (#1 f, passed + 1, List.revAppend (summarize d x,
adamc@995 477 ls))
adam@1394 478 | EError _ => [Abort]
adamc@579 479 | _ => [Unsure]
adamc@579 480 in
adamc@694 481 unravel (e, 0, [])
adamc@579 482 end
adamc@252 483
adamc@941 484 | EAbs _ => []
adamc@316 485
adamc@579 486 | EUnop (_, e) => summarize d e
adam@1360 487 | EBinop (_, _, e1, e2) => summarize d e1 @ summarize d e2
adamc@470 488
adamc@579 489 | ERecord xets => List.concat (map (summarize d o #2) xets)
adamc@579 490 | EField (e, _) => summarize d e
adamc@470 491
adamc@1214 492 | ECase (e, pes, _) =>
adamc@1214 493 let
adam@2040 494 val lss = map (fn (p, e) => summarize (if d = ~1 then ~1 else d + patBinds p) e) pes
adam@1394 495
adam@1394 496 fun splitRel ls acc =
adam@1394 497 case ls of
adam@1394 498 [] => (acc, false, ls)
adam@1394 499 | UseRel :: ls => (acc, true, ls)
adam@1394 500 | v :: ls => splitRel ls (v :: acc)
adam@1394 501
adam@1394 502 val (pre, used, post) = foldl (fn (ls, (pre, used, post)) =>
adam@1394 503 let
adam@1394 504 val (pre', used', post') = splitRel ls []
adam@1394 505 in
adam@1394 506 (pre' @ pre, used' orelse used, post' @ post)
adam@1394 507 end)
adam@1394 508 ([], false, []) lss
adamc@579 509 in
adam@1394 510 summarize d e
adam@1394 511 @ pre
adam@1394 512 @ (if used then [UseRel] else [])
adam@1394 513 @ post
adamc@1214 514 end
adamc@579 515 | EStrcat (e1, e2) => summarize d e1 @ summarize d e2
adamc@316 516
adamc@1225 517 | EError (e, _) => summarize d e @ [Abort]
adam@1932 518 | EReturnBlob {blob = NONE, mimeType = e2, ...} => summarize d e2 @ [Abort]
adam@1932 519 | EReturnBlob {blob = SOME e1, mimeType = e2, ...} => summarize d e1 @ summarize d e2 @ [Abort]
adamc@1225 520 | ERedirect (e, _) => summarize d e @ [Abort]
adamc@318 521
adamc@579 522 | EWrite e => summarize d e @ [WritePage]
adamc@579 523
adamc@579 524 | ESeq (e1, e2) => summarize d e1 @ summarize d e2
adam@2041 525 | ELet (_, _, e1, e2) => summarize d e1 @ summarize (if d = ~1 then ~1 else d + 1) e2
adamc@456 526
adamc@579 527 | EClosure (_, es) => List.concat (map (summarize d) es)
adamc@470 528
adamc@579 529 | EQuery {query, body, initial, ...} =>
adamc@579 530 List.concat [summarize d query,
adamc@579 531 summarize d initial,
adamc@941 532 [ReadDb],
adam@2040 533 summarize (if d = ~1 then ~1 else d + 2) body]
adamc@470 534
adam@1293 535 | EDml (e, _) => summarize d e @ [WriteDb]
adamc@579 536 | ENextval e => summarize d e @ [WriteDb]
adamc@1073 537 | ESetval (e1, e2) => summarize d e1 @ summarize d e2 @ [WriteDb]
adamc@1112 538 | EUnurlify (e, _, _) => summarize d e
adamc@815 539 | EJavaScript (_, e) => summarize d e
adamc@579 540 | ESignalReturn e => summarize d e
adamc@579 541 | ESignalBind (e1, e2) => summarize d e1 @ summarize d e2
adamc@579 542 | ESignalSource e => summarize d e
adamc@608 543
adam@1848 544 | EServerCall (e, _, _, _) => summarize d e @ [Unsure]
adamc@1021 545 | ERecv (e, _) => summarize d e @ [Unsure]
adamc@1021 546 | ESleep e => summarize d e @ [Unsure]
adamc@1021 547 | ESpawn e => summarize d e @ [Unsure]
adamc@579 548 in
adamc@579 549 (*Print.prefaces "Summarize"
adamc@579 550 [("e", MonoPrint.p_exp MonoEnv.empty (e, ErrorMsg.dummySpan)),
adamc@579 551 ("d", Print.PD.string (Int.toString d)),
adamc@579 552 ("s", p_events s)];*)
adamc@579 553 s
adamc@579 554 end
adamc@470 555
adamc@919 556 val impure = fn env => fn e =>
adam@1963 557 simpleImpure false (timpures, impures) env e andalso impure e
adamc@916 558 andalso not (List.null (summarize ~1 e))
adamc@916 559
adam@1852 560 fun passive (e : exp) =
adam@1852 561 case #1 e of
adam@1852 562 EPrim _ => true
adam@1852 563 | ERel _ => true
adam@1852 564 | ENamed _ => true
adam@1852 565 | ECon (_, _, NONE) => true
adam@1852 566 | ECon (_, _, SOME e) => passive e
adam@1852 567 | ENone _ => true
adam@1852 568 | ESome (_, e) => passive e
adam@1852 569 | EFfi _ => true
adam@1852 570 | EAbs _ => true
adam@1852 571 | ERecord xets => List.all (passive o #2) xets
adam@1852 572 | EField (e, _) => passive e
adam@1852 573 | _ => false
adam@1852 574
adamc@470 575 fun exp env e =
adamc@470 576 let
adamc@470 577 (*val () = Print.prefaces "exp" [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan))]*)
adamc@470 578
adamc@1017 579 fun doLet (x, t, e', b) =
adamc@1017 580 let
adamc@1017 581 fun doSub () =
adamc@1017 582 let
adamc@1017 583 val r = subExpInExp (0, e') b
adamc@1017 584 in
adamc@1017 585 (*Print.prefaces "doSub" [("e'", MonoPrint.p_exp env e'),
adam@1423 586 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adam@1423 587 ("r", MonoPrint.p_exp env r)];*)
adamc@1017 588 #1 (reduceExp env r)
adamc@1017 589 end
adamc@1017 590
adam@1855 591 fun trySub () =
adamc@1017 592 ((*Print.prefaces "trySub"
adamc@1017 593 [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan))];*)
adamc@1017 594 case t of
adamc@1017 595 (TFfi ("Basis", "string"), _) => doSub ()
adamc@1017 596 | (TSignal _, _) => e
adamc@1017 597 | _ =>
adam@1855 598 case e' of
adam@1855 599 (ECase _, _) => e
adam@1855 600 | _ => doSub ())
adam@2084 601
adam@2084 602 fun isRecord () =
adam@2084 603 case #1 e' of
adam@2084 604 ERecord _ => true
adam@2084 605 | _ => false
adam@2084 606
adam@2084 607 fun whichProj i (e : exp) =
adam@2084 608 case #1 e of
adam@2084 609 EPrim _ => SOME SS.empty
adam@2084 610 | ERel i' => if i' = i then NONE else SOME SS.empty
adam@2084 611 | ENamed _ => SOME SS.empty
adam@2084 612 | ECon (_, _, NONE) => SOME SS.empty
adam@2084 613 | ECon (_, _, SOME e') => whichProj i e'
adam@2084 614 | ENone _ => SOME SS.empty
adam@2084 615 | ESome (_, e') => whichProj i e'
adam@2084 616 | EFfi _ => SOME SS.empty
adam@2084 617 | EFfiApp (_, _, es) => whichProjs i (map #1 es)
adam@2084 618 | EApp (e1, e2) => whichProjs i [e1, e2]
adam@2084 619 | EAbs (_, _, _, e) => whichProj (i + 1) e
adam@2084 620 | EUnop (_, e1) => whichProj i e1
adam@2084 621 | EBinop (_, _, e1, e2) => whichProjs i [e1, e2]
adam@2084 622 | ERecord xets => whichProjs i (map #2 xets)
adam@2084 623 | EField ((ERel i', _), s) =>
adam@2084 624 if i' = i then
adam@2084 625 SOME (SS.singleton s)
adam@2084 626 else
adam@2084 627 SOME SS.empty
adam@2084 628 | EField (e1, _) => whichProj i e1
adam@2084 629 | ECase (e1, pes, _) =>
adam@2084 630 whichProjs' i ((0, e1)
adam@2084 631 :: map (fn (p, e) => (patBinds p, e)) pes)
adam@2084 632 | EStrcat (e1, e2) => whichProjs i [e1, e2]
adam@2084 633 | EError (e1, _) => whichProj i e1
adam@2084 634 | EReturnBlob {blob = NONE, mimeType = e2, ...} => whichProj i e2
adam@2084 635 | EReturnBlob {blob = SOME e1, mimeType = e2, ...} => whichProjs i [e1, e2]
adam@2084 636 | ERedirect (e1, _) => whichProj i e1
adam@2084 637 | EWrite e1 => whichProj i e1
adam@2084 638 | ESeq (e1, e2) => whichProjs i [e1, e2]
adam@2084 639 | ELet (_, _, e1, e2) => whichProjs' i [(0, e1), (1, e2)]
adam@2084 640 | EClosure (_, es) => whichProjs i es
adam@2084 641 | EQuery {query = e1, body = e2, initial = e3, ...} =>
adam@2084 642 whichProjs' i [(0, e1), (2, e2), (0, e3)]
adam@2084 643 | EDml (e1, _) => whichProj i e1
adam@2084 644 | ENextval e1 => whichProj i e1
adam@2084 645 | ESetval (e1, e2) => whichProjs i [e1, e2]
adam@2084 646 | EUnurlify (e1, _, _) => whichProj i e1
adam@2084 647 | EJavaScript (_, e1) => whichProj i e1
adam@2084 648 | ESignalReturn e1 => whichProj i e1
adam@2084 649 | ESignalBind (e1, e2) => whichProjs i [e1, e2]
adam@2084 650 | ESignalSource e1 => whichProj i e1
adam@2084 651 | EServerCall (e1, _, _, _) => whichProj i e1
adam@2084 652 | ERecv (e1, _) => whichProj i e1
adam@2084 653 | ESleep e1 => whichProj i e1
adam@2084 654 | ESpawn e1 => whichProj i e1
adam@2084 655
adam@2084 656 and whichProjs i es =
adam@2084 657 whichProjs' i (map (fn e => (0, e)) es)
adam@2084 658
adam@2084 659 and whichProjs' i es =
adam@2084 660 case es of
adam@2084 661 [] => SOME SS.empty
adam@2084 662 | (n, e) :: es' =>
adam@2084 663 case (whichProj (i + n) e, whichProjs' i es') of
adam@2084 664 (SOME m1, SOME m2) =>
adam@2084 665 if SS.isEmpty (SS.intersection (m1, m2)) then
adam@2084 666 SOME (SS.union (m1, m2))
adam@2084 667 else
adam@2084 668 NONE
adam@2084 669 | _ => NONE
adamc@1017 670 in
adamc@1017 671 if impure env e' then
adamc@1017 672 let
adamc@1017 673 val effs_e' = summarize 0 e'
adamc@1017 674 val effs_e' = List.filter (fn x => x <> UseRel) effs_e'
adamc@1017 675 val effs_b = summarize 0 b
adamc@1017 676
adam@2040 677 (*val () = Print.prefaces "Try"
adam@1394 678 [(*("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan)),*)
adamc@1017 679 ("e'", MonoPrint.p_exp env e'),
adamc@1017 680 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adamc@1017 681 ("e'_eff", p_events effs_e'),
adamc@1017 682 ("b_eff", p_events effs_b)]*)
adamc@1017 683
adamc@1017 684 fun does eff = List.exists (fn eff' => eff' = eff) effs_e'
adamc@1017 685 val writesPage = does WritePage
adamc@1017 686 val readsDb = does ReadDb
adamc@1017 687 val writesDb = does WriteDb
adamc@1225 688 val readsCookie = does ReadCookie
adamc@1225 689 val writesCookie = does ReadCookie
adamc@1017 690
adamc@1017 691 fun verifyUnused eff =
adamc@1017 692 case eff of
adamc@1017 693 UseRel => false
adamc@1017 694 | _ => true
adamc@1017 695
adamc@1017 696 fun verifyCompatible effs =
adamc@1017 697 case effs of
adamc@1017 698 [] => false
adamc@1017 699 | eff :: effs =>
adamc@1017 700 case eff of
adamc@1017 701 Unsure => false
adamc@1017 702 | UseRel => List.all verifyUnused effs
adamc@1017 703 | WritePage => not writesPage andalso verifyCompatible effs
adamc@1017 704 | ReadDb => not writesDb andalso verifyCompatible effs
adamc@1017 705 | WriteDb => not writesDb andalso not readsDb andalso verifyCompatible effs
adamc@1225 706 | ReadCookie => not writesCookie andalso verifyCompatible effs
adamc@1225 707 | WriteCookie => not writesCookie andalso not readsCookie
adamc@1225 708 andalso verifyCompatible effs
adamc@1225 709 | Abort => true
adamc@1017 710 in
adamc@1017 711 (*Print.prefaces "verifyCompatible"
adamc@1017 712 [("e'", MonoPrint.p_exp env e'),
adamc@1017 713 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adamc@1017 714 ("effs_e'", Print.p_list p_event effs_e'),
adamc@1017 715 ("effs_b", Print.p_list p_event effs_b)];*)
adamc@1017 716 if (List.null effs_e'
adamc@1017 717 orelse (List.all (fn eff => eff <> Unsure) effs_e'
adamc@1017 718 andalso verifyCompatible effs_b)
adamc@1017 719 orelse (case effs_b of
adamc@1017 720 UseRel :: effs => List.all verifyUnused effs
adamc@1017 721 | _ => false))
adamc@1017 722 andalso countFree 0 0 b = 1
adamc@1017 723 andalso not (freeInAbs b) then
adam@1855 724 trySub ()
adamc@1017 725 else
adamc@1017 726 e
adamc@1017 727 end
adam@2084 728 else if countFree 0 0 b > 1
adam@2084 729 andalso not (!fullMode)
adam@2084 730 andalso not (passive e')
adam@2084 731 andalso not (isRecord () andalso Option.isSome (whichProj 0 b)) then
adam@1817 732 e
adamc@1017 733 else
adam@1855 734 trySub ()
adamc@1017 735 end
adamc@1017 736
adamc@470 737 val r =
adamc@470 738 case e of
adamc@470 739 ERel n =>
adamc@470 740 (case E.lookupERel env n of
adamc@470 741 (_, _, SOME e') => #1 e'
adamc@470 742 | _ => e)
adamc@470 743 | ENamed n =>
adamc@470 744 (case E.lookupENamed env n of
adamc@470 745 (_, _, SOME e', _) => ((*Print.prefaces "Switch" [("n", Print.PD.string (Int.toString n)),
adamc@470 746 ("e'", MonoPrint.p_exp env e')];*)
adamc@470 747 #1 e')
adamc@470 748 | _ => e)
adamc@470 749
adamc@470 750 | EApp ((EAbs (x, t, _, e1), loc), e2) =>
adamc@470 751 ((*Print.prefaces "Considering" [("e1", MonoPrint.p_exp (E.pushERel env x t NONE) e1),
adamc@694 752 ("e2", MonoPrint.p_exp env e2),
adamc@694 753 ("sub", MonoPrint.p_exp env (reduceExp env (subExpInExp (0, e2) e1)))];*)
adam@1852 754 if impure env e2 orelse (not (!fullMode) andalso countFree 0 0 e1 > 1) then
adamc@470 755 #1 (reduceExp env (ELet (x, t, e2, e1), loc))
adamc@470 756 else
adamc@470 757 #1 (reduceExp env (subExpInExp (0, e2) e1)))
adamc@470 758
adamc@470 759 | ECase (e', pes, {disc, result}) =>
adamc@442 760 let
adamc@470 761 fun push () =
adamc@470 762 case result of
adamc@470 763 (TFun (dom, result), loc) =>
adamc@1107 764 let
adam@1855 765 fun safe e =
adam@1855 766 List.all (fn UseRel => true
adam@1855 767 | Abort => true
adam@1855 768 | _ => false) (summarize 0 e)
adam@1855 769
adam@1855 770 fun p_events' es = Print.box [Print.PD.string "{",
adam@1855 771 p_events es,
adam@1855 772 Print.PD.string "}"]
adamc@1107 773 in
adamc@1107 774 if List.all (safe o #2) pes then
adam@2126 775 (yankedCase := true;
adam@2126 776 EAbs ("y", dom, result,
adam@2126 777 (ECase (liftExpInExp 0 e',
adam@2126 778 map (fn (p, (EAbs (_, _, _, e), _)) =>
adam@2126 779 (p, swapExpVarsPat (0, patBinds p) e)
adam@2126 780 | (p, (EError (e, (TFun (_, t), _)), loc)) =>
adam@2126 781 (p, (EError (liftExpInExp (patBinds p) e, t), loc))
adam@2126 782 | (p, e) =>
adam@2126 783 (p, (EApp (liftExpInExp (patBinds p) e,
adam@2126 784 (ERel (patBinds p), loc)), loc)))
adam@2126 785 pes,
adam@2126 786 {disc = disc, result = result}), loc)))
adamc@1107 787 else
adamc@1107 788 e
adamc@1107 789 end
adamc@470 790 | _ => e
adamc@318 791
adamc@470 792 fun search pes =
adamc@470 793 case pes of
adamc@470 794 [] => push ()
adamc@470 795 | (p, body) :: pes =>
adamc@814 796 case match ([], p, e') of
adamc@470 797 No => search pes
adamc@470 798 | Maybe => push ()
adamc@814 799 | Yes subs =>
adamc@800 800 let
adamc@829 801 val (body, remaining) =
adam@1817 802 foldl (fn ((x, t, e), (body, remaining)) =>
adam@1817 803 (if countFree 0 0 body > 1 then
adam@1817 804 (ELet (x, t, multiLift remaining e, body), #2 e')
adam@1817 805 else
adam@1817 806 subExpInExp (0, multiLift remaining e) body, remaining - 1))
adamc@829 807 (body, length subs - 1) subs
adamc@920 808 val r = reduceExp (E.patBinds env p) body
adamc@800 809 in
adamc@829 810 (*Print.preface ("subs", Print.p_list (MonoPrint.p_exp env) subs);*)
adamc@800 811 (*Print.prefaces "ECase"
adamc@829 812 [("old", MonoPrint.p_exp env body),
adamc@829 813 ("body", MonoPrint.p_exp env body),
adamc@800 814 ("r", MonoPrint.p_exp env r)];*)
adamc@800 815 #1 r
adamc@800 816 end
adamc@470 817 in
adamc@941 818 if impure env e' then
adamc@941 819 e
adamc@941 820 else
adamc@941 821 search pes
adamc@470 822 end
adamc@318 823
adam@2110 824 | EField (e1, x) =>
adam@2110 825 let
adam@2110 826 fun yankLets (e : exp) =
adam@2110 827 case #1 e of
adam@2110 828 ELet (x, t, e1, e2) => (ELet (x, t, e1, yankLets e2), #2 e)
adam@2110 829 | ERecord xes =>
adam@2110 830 (case List.find (fn (x', _, _) => x' = x) xes of
adam@2110 831 SOME (_, e, _) => e
adam@2110 832 | NONE => (EField (e, x), #2 e))
adam@2110 833 | _ => (EField (e, x), #2 e)
adam@2110 834 in
adam@2110 835 #1 (yankLets e1)
adam@2110 836 end
adamc@398 837
adamc@470 838 | ELet (x1, t1, (ELet (x2, t2, e1, b1), loc), b2) =>
adamc@470 839 let
adamc@470 840 val e' = (ELet (x2, t2, e1,
adamc@470 841 (ELet (x1, t1, b1,
adamc@470 842 liftExpInExp 1 b2), loc)), loc)
adamc@442 843 in
adamc@470 844 (*Print.prefaces "ELet commute" [("e", MonoPrint.p_exp env (e, loc)),
adamc@470 845 ("e'", MonoPrint.p_exp env e')];*)
adamc@470 846 #1 (reduceExp env e')
adamc@470 847 end
adamc@470 848 | EApp ((ELet (x, t, e, b), loc), e') =>
adamc@470 849 #1 (reduceExp env (ELet (x, t, e,
adamc@470 850 (EApp (b, liftExpInExp 0 e'), loc)), loc))
adamc@470 851
adamc@1017 852 | ELet (x, t, e', b as (EAbs (x', t' as (TRecord [], _), ran, e''), loc)) =>
adamc@919 853 if impure env e' then
adamc@1017 854 doLet (x, t, e', b)
adamc@848 855 else
adamc@920 856 EAbs (x', t', ran, reduceExp (E.pushERel env x' t' NONE)
adamc@920 857 (ELet (x, t, liftExpInExp 0 e', swapExpVars 0 e''), loc))
adamc@470 858
adamc@1017 859 | ELet (x, t, e', b) => doLet (x, t, e', b)
adamc@252 860
adam@2048 861 | EStrcat ((EPrim (Prim.String (k1, s1)), _), (EPrim (Prim.String (k2, s2)), _)) =>
adam@2048 862 EPrim (Prim.String ((case (k1, k2) of
adam@2048 863 (Prim.Html, Prim.Html) => Prim.Html
adam@2048 864 | _ => Prim.Normal), s1 ^ s2))
adamc@268 865
adamc@572 866 | ESignalBind ((ESignalReturn e1, loc), e2) =>
adamc@572 867 #1 (reduceExp env (EApp (e2, e1), loc))
adamc@572 868
adamc@470 869 | _ => e
adamc@470 870 in
adamc@829 871 (*Print.prefaces "exp'" [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan)),
adamc@829 872 ("r", MonoPrint.p_exp env (r, ErrorMsg.dummySpan))];*)
adamc@470 873 r
adamc@470 874 end
adamc@470 875
adamc@470 876 and bind (env, b) =
adamc@470 877 case b of
adamc@470 878 U.Decl.Datatype (x, n, xncs) => E.pushDatatype env x n xncs
adamc@470 879 | U.Decl.RelE (x, t) => E.pushERel env x t NONE
adamc@1017 880 | U.Decl.NamedE (x, n, t, eo, s) =>
adamc@1017 881 let
adamc@1017 882 val eo = case eo of
adamc@1017 883 NONE => NONE
adam@1393 884 | SOME e => if mayInline (n, e, t, s) then
adamc@1017 885 SOME e
adamc@1017 886 else
adamc@1017 887 NONE
adamc@1017 888 in
adamc@1017 889 E.pushENamed env x n t (Option.map (reduceExp env) eo) s
adamc@1017 890 end
adamc@470 891
adamc@470 892 and reduceExp env = U.Exp.mapB {typ = typ, exp = exp, bind = bind} env
adamc@470 893
adamc@801 894 fun decl env d = ((*Print.preface ("d", MonoPrint.p_decl env (d, ErrorMsg.dummySpan));*)
adamc@801 895 d)
adamc@398 896 in
adamc@470 897 U.File.mapB {typ = typ, exp = exp, decl = decl, bind = bind} E.empty file
adamc@398 898 end
adamc@133 899
adam@2126 900 fun reduce file =
adam@2126 901 let
adam@2126 902 val () = yankedCase := false
adam@2126 903 val file' = reduce' file
adam@2126 904 in
adam@2126 905 if !yankedCase then
adam@2126 906 reduce file'
adam@2126 907 else
adam@2126 908 file'
adam@2126 909 end
adam@2126 910
adam@2126 911
adamc@133 912 end