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annotate src/mono_reduce.sml @ 1804:62c18ecbfec4

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Tweaking treatment of function application: substitute or introduce a 'let'?
author Adam Chlipala <adam@chlipala.net>
date Sun, 05 Aug 2012 14:55:28 -0400
parents 0577be31a435
children d12192c7aa3e
rev   line source
adamc@133 1 (* Copyright (c) 2008, 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
adamc@133 34 structure E = MonoEnv
adamc@133 35 structure U = MonoUtil
adamc@133 36
adamc@470 37 structure IM = IntBinaryMap
adamc@916 38 structure IS = IntBinarySet
adamc@470 39
adamc@133 40
adamc@948 41 fun simpleTypeImpure tsyms =
adamc@919 42 U.Typ.exists (fn TFun _ => true
adamc@948 43 | TDatatype (n, _) => IS.member (tsyms, n)
adamc@919 44 | _ => false)
adamc@919 45
adamc@948 46 fun simpleImpure (tsyms, syms) =
adamc@919 47 U.Exp.existsB {typ = fn _ => false,
adamc@919 48 exp = fn (env, e) =>
adamc@919 49 case e of
adamc@919 50 EWrite _ => true
adamc@919 51 | EQuery _ => true
adamc@919 52 | EDml _ => true
adamc@919 53 | ENextval _ => true
adamc@1073 54 | ESetval _ => true
adamc@1171 55 | EFfiApp (m, x, _) => Settings.isEffectful (m, x) orelse Settings.isBenignEffectful (m, x)
adamc@919 56 | EServerCall _ => true
adamc@919 57 | ERecv _ => true
adamc@919 58 | ESleep _ => true
adamc@919 59 | ENamed n => IS.member (syms, n)
adamc@919 60 | ERel n =>
adamc@919 61 let
adamc@919 62 val (_, t, _) = E.lookupERel env n
adamc@919 63 in
adamc@948 64 simpleTypeImpure tsyms t
adamc@919 65 end
adamc@919 66 | _ => false,
adamc@919 67 bind = fn (env, b) =>
adamc@919 68 case b of
adamc@919 69 U.Exp.RelE (x, t) => E.pushERel env x t NONE
adamc@919 70 | _ => env}
adamc@916 71
adamc@252 72 fun impure (e, _) =
adamc@252 73 case e of
adamc@252 74 EWrite _ => true
adamc@252 75 | EQuery _ => true
adamc@307 76 | EDml _ => true
adamc@338 77 | ENextval _ => true
adamc@1073 78 | ESetval _ => true
adam@1423 79 | EUnurlify (e, _, _) => impure e
adamc@252 80 | EAbs _ => false
adamc@252 81
adamc@252 82 | EPrim _ => false
adamc@252 83 | ERel _ => false
adamc@252 84 | ENamed _ => false
adamc@252 85 | ECon (_, _, eo) => (case eo of NONE => false | SOME e => impure e)
adamc@297 86 | ENone _ => false
adamc@290 87 | ESome (_, e) => impure e
adamc@252 88 | EFfi _ => false
adamc@1171 89 | EFfiApp (m, x, _) => Settings.isEffectful (m, x) orelse Settings.isBenignEffectful (m, x)
adamc@252 90 | EApp ((EFfi _, _), _) => false
adamc@252 91 | EApp _ => true
adamc@252 92
adamc@387 93 | EUnop (_, e) => impure e
adam@1360 94 | EBinop (_, _, e1, e2) => impure e1 orelse impure e2
adamc@387 95
adamc@252 96 | ERecord xes => List.exists (fn (_, e, _) => impure e) xes
adamc@252 97 | EField (e, _) => impure e
adamc@252 98
adamc@252 99 | ECase (e, pes, _) => impure e orelse List.exists (fn (_, e) => impure e) pes
adamc@252 100
adamc@1069 101 | EError _ => true
adamc@741 102 | EReturnBlob {blob = e1, mimeType = e2, ...} => impure e1 orelse impure e2
adamc@1065 103 | ERedirect (e, _) => impure e
adamc@283 104
adamc@252 105 | EStrcat (e1, e2) => impure e1 orelse impure e2
adamc@252 106
adamc@252 107 | ESeq (e1, e2) => impure e1 orelse impure e2
adamc@252 108 | ELet (_, _, e1, e2) => impure e1 orelse impure e2
adamc@252 109
adamc@252 110 | EClosure (_, es) => List.exists impure es
adamc@815 111 | EJavaScript (_, e) => impure e
adamc@568 112 | ESignalReturn e => impure e
adamc@572 113 | ESignalBind (e1, e2) => impure e1 orelse impure e2
adamc@574 114 | ESignalSource e => impure e
adamc@608 115 | EServerCall _ => true
adamc@670 116 | ERecv _ => true
adamc@695 117 | ESleep _ => true
adamc@1021 118 | ESpawn _ => true
adamc@252 119
adamc@252 120 val liftExpInExp = Monoize.liftExpInExp
adamc@252 121
adamc@829 122 fun multiLift n e =
adamc@829 123 case n of
adamc@829 124 0 => e
adamc@829 125 | _ => multiLift (n - 1) (liftExpInExp 0 e)
adamc@829 126
adamc@252 127 val subExpInExp' =
adamc@133 128 U.Exp.mapB {typ = fn t => t,
adamc@133 129 exp = fn (xn, rep) => fn e =>
adamc@133 130 case e of
adamc@133 131 ERel xn' =>
adamc@133 132 (case Int.compare (xn', xn) of
adamc@133 133 EQUAL => #1 rep
adamc@133 134 | GREATER=> ERel (xn' - 1)
adamc@133 135 | LESS => e)
adamc@133 136 | _ => e,
adamc@133 137 bind = fn ((xn, rep), U.Exp.RelE _) => (xn+1, liftExpInExp 0 rep)
adamc@133 138 | (ctx, _) => ctx}
adamc@133 139
adamc@252 140 fun subExpInExp (n, e1) e2 =
adamc@252 141 let
adamc@252 142 val r = subExpInExp' (n, e1) e2
adamc@252 143 in
adamc@252 144 (*Print.prefaces "subExpInExp" [("e1", MonoPrint.p_exp MonoEnv.empty e1),
adamc@252 145 ("e2", MonoPrint.p_exp MonoEnv.empty e2),
adamc@252 146 ("r", MonoPrint.p_exp MonoEnv.empty r)];*)
adamc@252 147 r
adamc@252 148 end
adamc@133 149
adamc@133 150 fun typ c = c
adamc@133 151
adamc@316 152 val swapExpVars =
adamc@316 153 U.Exp.mapB {typ = fn t => t,
adamc@316 154 exp = fn lower => fn e =>
adamc@316 155 case e of
adamc@316 156 ERel xn =>
adamc@316 157 if xn = lower then
adamc@316 158 ERel (lower + 1)
adamc@316 159 else if xn = lower + 1 then
adamc@316 160 ERel lower
adamc@316 161 else
adamc@316 162 e
adamc@316 163 | _ => e,
adamc@316 164 bind = fn (lower, U.Exp.RelE _) => lower+1
adamc@316 165 | (lower, _) => lower}
adamc@316 166
adamc@341 167 val swapExpVarsPat =
adamc@341 168 U.Exp.mapB {typ = fn t => t,
adamc@341 169 exp = fn (lower, len) => fn e =>
adamc@341 170 case e of
adamc@341 171 ERel xn =>
adamc@341 172 if xn = lower then
adamc@827 173 ERel (lower + len)
adamc@341 174 else if xn >= lower + 1 andalso xn < lower + 1 + len then
adamc@341 175 ERel (xn - 1)
adamc@341 176 else
adamc@341 177 e
adamc@341 178 | _ => e,
adamc@341 179 bind = fn ((lower, len), U.Exp.RelE _) => (lower+1, len)
adamc@341 180 | (st, _) => st}
adamc@341 181
adam@1804 182 datatype result = Yes of (string * typ * exp) list | No | Maybe
adamc@258 183
adamc@183 184 fun match (env, p : pat, e : exp) =
adamc@183 185 case (#1 p, #1 e) of
adamc@258 186 (PWild, _) => Yes env
adam@1804 187 | (PVar (x, t), _) => Yes ((x, t, e) :: env)
adamc@183 188
adamc@280 189 | (PPrim (Prim.String s), EStrcat ((EPrim (Prim.String s'), _), _)) =>
adamc@280 190 if String.isPrefix s' s then
adamc@280 191 Maybe
adamc@280 192 else
adamc@280 193 No
adamc@280 194
adamc@1207 195 | (PPrim (Prim.String s), EStrcat (_, (EPrim (Prim.String s'), _))) =>
adamc@1207 196 if String.isSuffix s' s then
adamc@1207 197 Maybe
adamc@1207 198 else
adamc@1207 199 No
adamc@1207 200
adamc@183 201 | (PPrim p, EPrim p') =>
adamc@183 202 if Prim.equal (p, p') then
adamc@258 203 Yes env
adamc@183 204 else
adamc@258 205 No
adamc@183 206
kkallio@1489 207 | (PCon (_, PConVar n1, po), ECon (_, PConVar n2, eo)) =>
adamc@183 208 if n1 = n2 then
kkallio@1489 209 case (po, eo) of
kkallio@1489 210 (NONE, NONE) => Yes env
kkallio@1489 211 | (SOME p, SOME e) => match (env, p, e)
kkallio@1489 212 | _ => Maybe
adamc@183 213 else
adamc@258 214 No
adamc@183 215
adamc@188 216 | (PCon (_, PConFfi {mod = m1, con = con1, ...}, NONE), ECon (_, PConFfi {mod = m2, con = con2, ...}, NONE)) =>
adamc@185 217 if m1 = m2 andalso con1 = con2 then
adamc@258 218 Yes env
adamc@185 219 else
adamc@258 220 No
adamc@185 221
adamc@188 222 | (PCon (_, PConFfi {mod = m1, con = con1, ...}, SOME ep), ECon (_, PConFfi {mod = m2, con = con2, ...}, SOME e)) =>
adamc@185 223 if m1 = m2 andalso con1 = con2 then
adamc@185 224 match (env, p, e)
adamc@185 225 else
adamc@258 226 No
adamc@185 227
adamc@183 228 | (PRecord xps, ERecord xes) =>
adamc@183 229 let
adamc@183 230 fun consider (xps, env) =
adamc@183 231 case xps of
adamc@258 232 [] => Yes env
adamc@183 233 | (x, p, _) :: rest =>
adamc@183 234 case List.find (fn (x', _, _) => x' = x) xes of
adamc@258 235 NONE => No
adamc@183 236 | SOME (_, e, _) =>
adamc@183 237 case match (env, p, e) of
adamc@258 238 No => No
adamc@258 239 | Maybe => Maybe
adamc@258 240 | Yes env => consider (rest, env)
adamc@183 241 in
adamc@183 242 consider (xps, env)
adamc@183 243 end
adamc@183 244
adamc@726 245 | (PNone _, ENone _) => Yes env
adamc@921 246 | (PNone _, ESome _) => No
adamc@726 247 | (PSome (_, p), ESome (_, e)) => match (env, p, e)
adamc@921 248 | (PSome _, ENone _) => No
adamc@726 249
adamc@258 250 | _ => Maybe
adamc@183 251
adamc@318 252 datatype event =
adamc@318 253 WritePage
adamc@318 254 | ReadDb
adamc@318 255 | WriteDb
adamc@1225 256 | ReadCookie
adamc@1225 257 | WriteCookie
adamc@481 258 | UseRel
adamc@318 259 | Unsure
adamc@1225 260 | Abort
adamc@318 261
adamc@318 262 fun p_event e =
adamc@318 263 let
adamc@318 264 open Print.PD
adamc@318 265 in
adamc@318 266 case e of
adamc@318 267 WritePage => string "WritePage"
adamc@318 268 | ReadDb => string "ReadDb"
adamc@318 269 | WriteDb => string "WriteDb"
adamc@1225 270 | ReadCookie => string "ReadCookie"
adamc@1225 271 | WriteCookie => string "WriteCookie"
adamc@481 272 | UseRel => string "UseRel"
adamc@318 273 | Unsure => string "Unsure"
adamc@1225 274 | Abort => string "Abort"
adamc@318 275 end
adamc@318 276
adamc@470 277 val p_events = Print.p_list p_event
adamc@470 278
adamc@318 279 fun patBinds (p, _) =
adamc@318 280 case p of
adamc@318 281 PWild => 0
adamc@318 282 | PVar _ => 1
adamc@318 283 | PPrim _ => 0
adamc@318 284 | PCon (_, _, NONE) => 0
adamc@318 285 | PCon (_, _, SOME p) => patBinds p
adamc@318 286 | PRecord xpts => foldl (fn ((_, p, _), n) => n + patBinds p) 0 xpts
adamc@318 287 | PNone _ => 0
adamc@318 288 | PSome (_, p) => patBinds p
adamc@318 289
adamc@932 290 val countFree = U.Exp.foldB {typ = fn (_, n) => n,
adamc@932 291 exp = fn (x, e, n) =>
adamc@932 292 case e of
adamc@932 293 ERel x' => if x = x' then n + 1 else n
adamc@932 294 | _ => n,
adamc@932 295 bind = fn (n, b) =>
adamc@932 296 case b of
adamc@932 297 U.Exp.RelE _ => n + 1
adamc@975 298 | _ => n}
adamc@975 299
adamc@975 300 val freeInAbs = U.Exp.existsB {typ = fn _ => false,
adamc@975 301 exp = fn (n, e) =>
adamc@975 302 case e of
adamc@975 303 EAbs (_, _, _, b) => countFree n 0 b > 0
adamc@975 304 | EJavaScript (_, b) => countFree n 0 b > 0
adamc@975 305 | _ => false,
adamc@975 306 bind = fn (n, b) =>
adamc@975 307 case b of
adamc@975 308 U.Exp.RelE _ => n + 1
adamc@975 309 | _ => n} 0
adamc@932 310
adamc@470 311 fun reduce file =
adamc@470 312 let
adamc@948 313 val (timpures, impures, absCounts) =
adamc@948 314 foldl (fn ((d, _), (timpures, impures, absCounts)) =>
adamc@916 315 let
adamc@916 316 fun countAbs (e, _) =
adamc@916 317 case e of
adamc@916 318 EAbs (_, _, _, e) => 1 + countAbs e
adamc@916 319 | _ => 0
adamc@916 320 in
adamc@916 321 case d of
adamc@948 322 DDatatype dts =>
adamc@948 323 (if List.exists (fn (_, _, cs) =>
adamc@948 324 List.exists (fn (_, _, NONE) => false
adamc@948 325 | (_, _, SOME t) => simpleTypeImpure timpures t) cs)
adamc@948 326 dts then
adamc@948 327 IS.addList (timpures, map #2 dts)
adamc@948 328 else
adamc@948 329 timpures,
adamc@948 330 impures,
adamc@948 331 absCounts)
adamc@948 332 | DVal (_, n, _, e, _) =>
adamc@948 333 (timpures,
adamc@948 334 if simpleImpure (timpures, impures) E.empty e then
adamc@916 335 IS.add (impures, n)
adamc@916 336 else
adamc@916 337 impures,
adamc@916 338 IM.insert (absCounts, n, countAbs e))
adamc@916 339 | DValRec vis =>
adamc@948 340 (timpures,
adamc@948 341 if List.exists (fn (_, _, _, e, _) => simpleImpure (timpures, impures) E.empty e) vis then
adamc@916 342 foldl (fn ((_, n, _, _, _), impures) =>
adamc@916 343 IS.add (impures, n)) impures vis
adamc@916 344 else
adamc@916 345 impures,
adamc@916 346 foldl (fn ((x, n, _, e, _), absCounts) =>
adamc@916 347 IM.insert (absCounts, n, countAbs e))
adamc@916 348 absCounts vis)
adamc@948 349 | _ => (timpures, impures, absCounts)
adamc@916 350 end)
adamc@948 351 (IS.empty, IS.empty, IM.empty) file
adamc@387 352
adamc@1017 353 val uses = U.File.fold {typ = fn (_, m) => m,
adamc@1017 354 exp = fn (e, m) =>
adamc@1017 355 case e of
adamc@1017 356 ENamed n => IM.insert (m, n, 1 + Option.getOpt (IM.find (m, n), 0))
adamc@1017 357 | _ => m,
adamc@1017 358 decl = fn (_, m) => m}
adamc@1017 359 IM.empty file
adamc@1017 360
adamc@1017 361 val size = U.Exp.fold {typ = fn (_, n) => n,
adamc@1017 362 exp = fn (_, n) => n + 1} 0
adamc@1017 363
adam@1360 364 val functionInside' = U.Typ.exists (fn c => case c of
adam@1360 365 TFun _ => true
adam@1360 366 | _ => false)
adam@1360 367
adam@1360 368 fun functionInside t =
adam@1360 369 case #1 t of
adam@1360 370 TFun (t1, t2) => functionInside' t1 orelse functionInside t2
adam@1360 371 | _ => functionInside' t
adam@1360 372
adam@1393 373 fun mayInline (n, e, t, s) =
adamc@1017 374 case IM.find (uses, n) of
adamc@1017 375 NONE => false
adamc@1017 376 | SOME count => count <= 1
adamc@1017 377 orelse size e <= Settings.getMonoInline ()
adam@1360 378 orelse functionInside t
adam@1393 379 orelse Settings.checkAlwaysInline s
adamc@1017 380
adamc@470 381 fun summarize d (e, _) =
adamc@579 382 let
adamc@579 383 val s =
adamc@579 384 case e of
adamc@579 385 EPrim _ => []
adamc@579 386 | ERel n => if n = d then [UseRel] else []
adamc@579 387 | ENamed _ => []
adamc@579 388 | ECon (_, _, NONE) => []
adamc@579 389 | ECon (_, _, SOME e) => summarize d e
adamc@579 390 | ENone _ => []
adamc@579 391 | ESome (_, e) => summarize d e
adamc@579 392 | EFfi _ => []
adam@1663 393 | EFfiApp ("Basis", "get_cookie", [(e, _)]) =>
adamc@1225 394 summarize d e @ [ReadCookie]
adam@1423 395 | EFfiApp ("Basis", "set_cookie", es) =>
adam@1663 396 List.concat (map (summarize d o #1) es) @ [WriteCookie]
adam@1423 397 | EFfiApp ("Basis", "clear_cookie", es) =>
adam@1663 398 List.concat (map (summarize d o #1) es) @ [WriteCookie]
adamc@765 399 | EFfiApp (m, x, es) =>
adamc@1171 400 if Settings.isEffectful (m, x) orelse Settings.isBenignEffectful (m, x) then
adam@1663 401 List.concat (map (summarize d o #1) es) @ [if m = "Basis" andalso String.isSuffix "_w" x then
adam@1663 402 WritePage
adam@1663 403 else
adam@1663 404 Unsure]
adamc@765 405 else
adam@1663 406 List.concat (map (summarize d o #1) es)
adamc@579 407 | EApp ((EFfi _, _), e) => summarize d e
adamc@579 408 | EApp _ =>
adamc@579 409 let
adamc@694 410 fun unravel (e, passed, ls) =
adamc@579 411 case e of
adamc@579 412 ENamed n =>
adamc@579 413 let
adamc@579 414 val ls = rev ls
adamc@579 415 in
adamc@948 416 if IS.member (impures, n) then
adamc@948 417 case IM.find (absCounts, n) of
adamc@948 418 NONE => [Unsure]
adamc@948 419 | SOME len =>
adamc@948 420 if passed < len then
adamc@948 421 ls
adamc@948 422 else
adamc@948 423 ls @ [Unsure]
adamc@948 424 else
adamc@948 425 ls
adamc@579 426 end
adamc@579 427 | ERel n => List.revAppend (ls,
adamc@579 428 if n = d then
adamc@579 429 [UseRel, Unsure]
adamc@579 430 else
adamc@579 431 [Unsure])
adamc@579 432 | EApp (f, x) =>
adamc@995 433 unravel (#1 f, passed + 1, List.revAppend (summarize d x,
adamc@995 434 ls))
adam@1394 435 | EError _ => [Abort]
adamc@579 436 | _ => [Unsure]
adamc@579 437 in
adamc@694 438 unravel (e, 0, [])
adamc@579 439 end
adamc@252 440
adamc@941 441 | EAbs _ => []
adamc@316 442
adamc@579 443 | EUnop (_, e) => summarize d e
adam@1360 444 | EBinop (_, _, e1, e2) => summarize d e1 @ summarize d e2
adamc@470 445
adamc@579 446 | ERecord xets => List.concat (map (summarize d o #2) xets)
adamc@579 447 | EField (e, _) => summarize d e
adamc@470 448
adamc@1214 449 | ECase (e, pes, _) =>
adamc@1214 450 let
adamc@579 451 val lss = map (fn (p, e) => summarize (d + patBinds p) e) pes
adam@1394 452
adam@1394 453 fun splitRel ls acc =
adam@1394 454 case ls of
adam@1394 455 [] => (acc, false, ls)
adam@1394 456 | UseRel :: ls => (acc, true, ls)
adam@1394 457 | v :: ls => splitRel ls (v :: acc)
adam@1394 458
adam@1394 459 val (pre, used, post) = foldl (fn (ls, (pre, used, post)) =>
adam@1394 460 let
adam@1394 461 val (pre', used', post') = splitRel ls []
adam@1394 462 in
adam@1394 463 (pre' @ pre, used' orelse used, post' @ post)
adam@1394 464 end)
adam@1394 465 ([], false, []) lss
adamc@579 466 in
adam@1394 467 summarize d e
adam@1394 468 @ pre
adam@1394 469 @ (if used then [UseRel] else [])
adam@1394 470 @ post
adamc@1214 471 end
adamc@579 472 | EStrcat (e1, e2) => summarize d e1 @ summarize d e2
adamc@316 473
adamc@1225 474 | EError (e, _) => summarize d e @ [Abort]
adamc@1225 475 | EReturnBlob {blob = e1, mimeType = e2, ...} => summarize d e1 @ summarize d e2 @ [Abort]
adamc@1225 476 | ERedirect (e, _) => summarize d e @ [Abort]
adamc@318 477
adamc@579 478 | EWrite e => summarize d e @ [WritePage]
adamc@579 479
adamc@579 480 | ESeq (e1, e2) => summarize d e1 @ summarize d e2
adamc@579 481 | ELet (_, _, e1, e2) => summarize d e1 @ summarize (d + 1) e2
adamc@456 482
adamc@579 483 | EClosure (_, es) => List.concat (map (summarize d) es)
adamc@470 484
adamc@579 485 | EQuery {query, body, initial, ...} =>
adamc@579 486 List.concat [summarize d query,
adamc@579 487 summarize d initial,
adamc@941 488 [ReadDb],
adamc@941 489 summarize (d + 2) body]
adamc@470 490
adam@1293 491 | EDml (e, _) => summarize d e @ [WriteDb]
adamc@579 492 | ENextval e => summarize d e @ [WriteDb]
adamc@1073 493 | ESetval (e1, e2) => summarize d e1 @ summarize d e2 @ [WriteDb]
adamc@1112 494 | EUnurlify (e, _, _) => summarize d e
adamc@815 495 | EJavaScript (_, e) => summarize d e
adamc@579 496 | ESignalReturn e => summarize d e
adamc@579 497 | ESignalBind (e1, e2) => summarize d e1 @ summarize d e2
adamc@579 498 | ESignalSource e => summarize d e
adamc@608 499
adamc@1020 500 | EServerCall (e, _, _) => summarize d e @ [Unsure]
adamc@1021 501 | ERecv (e, _) => summarize d e @ [Unsure]
adamc@1021 502 | ESleep e => summarize d e @ [Unsure]
adamc@1021 503 | ESpawn e => summarize d e @ [Unsure]
adamc@579 504 in
adamc@579 505 (*Print.prefaces "Summarize"
adamc@579 506 [("e", MonoPrint.p_exp MonoEnv.empty (e, ErrorMsg.dummySpan)),
adamc@579 507 ("d", Print.PD.string (Int.toString d)),
adamc@579 508 ("s", p_events s)];*)
adamc@579 509 s
adamc@579 510 end
adamc@470 511
adamc@919 512 val impure = fn env => fn e =>
adamc@948 513 simpleImpure (timpures, impures) env e andalso impure e
adamc@916 514 andalso not (List.null (summarize ~1 e))
adamc@916 515
adamc@470 516 fun exp env e =
adamc@470 517 let
adamc@470 518 (*val () = Print.prefaces "exp" [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan))]*)
adamc@470 519
adamc@1017 520 fun doLet (x, t, e', b) =
adamc@1017 521 let
adam@1804 522 val notValue = U.Exp.exists {typ = fn _ => false,
adam@1804 523 exp = fn e =>
adam@1804 524 case e of
adam@1804 525 EPrim _ => false
adam@1804 526 | ECon _ => false
adam@1804 527 | ENone _ => false
adam@1804 528 | ESome _ => false
adam@1804 529 | ERecord _ => false
adam@1804 530 | _ => true}
adam@1804 531
adam@1804 532
adamc@1017 533 fun doSub () =
adamc@1017 534 let
adamc@1017 535 val r = subExpInExp (0, e') b
adamc@1017 536 in
adamc@1017 537 (*Print.prefaces "doSub" [("e'", MonoPrint.p_exp env e'),
adam@1423 538 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adam@1423 539 ("r", MonoPrint.p_exp env r)];*)
adamc@1017 540 #1 (reduceExp env r)
adamc@1017 541 end
adamc@1017 542
adamc@1017 543 fun trySub () =
adamc@1017 544 ((*Print.prefaces "trySub"
adamc@1017 545 [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan))];*)
adamc@1017 546 case t of
adamc@1017 547 (TFfi ("Basis", "string"), _) => doSub ()
adamc@1017 548 | (TSignal _, _) => e
adamc@1017 549 | _ =>
adamc@1017 550 case e' of
adamc@1017 551 (ECase _, _) => e
adamc@1017 552 | _ => doSub ())
adamc@1017 553 in
adamc@1017 554 if impure env e' then
adamc@1017 555 let
adamc@1017 556 val effs_e' = summarize 0 e'
adamc@1017 557 val effs_e' = List.filter (fn x => x <> UseRel) effs_e'
adamc@1017 558 val effs_b = summarize 0 b
adamc@1017 559
adam@1394 560 (*val () = Print.fprefaces outf "Try"
adam@1394 561 [(*("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan)),*)
adamc@1017 562 ("e'", MonoPrint.p_exp env e'),
adamc@1017 563 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adamc@1017 564 ("e'_eff", p_events effs_e'),
adamc@1017 565 ("b_eff", p_events effs_b)]*)
adamc@1017 566
adamc@1017 567 fun does eff = List.exists (fn eff' => eff' = eff) effs_e'
adamc@1017 568 val writesPage = does WritePage
adamc@1017 569 val readsDb = does ReadDb
adamc@1017 570 val writesDb = does WriteDb
adamc@1225 571 val readsCookie = does ReadCookie
adamc@1225 572 val writesCookie = does ReadCookie
adamc@1017 573
adamc@1017 574 fun verifyUnused eff =
adamc@1017 575 case eff of
adamc@1017 576 UseRel => false
adamc@1017 577 | _ => true
adamc@1017 578
adamc@1017 579 fun verifyCompatible effs =
adamc@1017 580 case effs of
adamc@1017 581 [] => false
adamc@1017 582 | eff :: effs =>
adamc@1017 583 case eff of
adamc@1017 584 Unsure => false
adamc@1017 585 | UseRel => List.all verifyUnused effs
adamc@1017 586 | WritePage => not writesPage andalso verifyCompatible effs
adamc@1017 587 | ReadDb => not writesDb andalso verifyCompatible effs
adamc@1017 588 | WriteDb => not writesDb andalso not readsDb andalso verifyCompatible effs
adamc@1225 589 | ReadCookie => not writesCookie andalso verifyCompatible effs
adamc@1225 590 | WriteCookie => not writesCookie andalso not readsCookie
adamc@1225 591 andalso verifyCompatible effs
adamc@1225 592 | Abort => true
adamc@1017 593 in
adamc@1017 594 (*Print.prefaces "verifyCompatible"
adamc@1017 595 [("e'", MonoPrint.p_exp env e'),
adamc@1017 596 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adamc@1017 597 ("effs_e'", Print.p_list p_event effs_e'),
adamc@1017 598 ("effs_b", Print.p_list p_event effs_b)];*)
adamc@1017 599 if (List.null effs_e'
adamc@1017 600 orelse (List.all (fn eff => eff <> Unsure) effs_e'
adamc@1017 601 andalso verifyCompatible effs_b)
adamc@1017 602 orelse (case effs_b of
adamc@1017 603 UseRel :: effs => List.all verifyUnused effs
adamc@1017 604 | _ => false))
adamc@1017 605 andalso countFree 0 0 b = 1
adamc@1017 606 andalso not (freeInAbs b) then
adamc@1017 607 trySub ()
adamc@1017 608 else
adamc@1017 609 e
adamc@1017 610 end
adam@1804 611 else if countFree 0 0 b > 1 andalso notValue e' then
adam@1804 612 e
adamc@1017 613 else
adamc@1017 614 trySub ()
adamc@1017 615 end
adamc@1017 616
adamc@470 617 val r =
adamc@470 618 case e of
adamc@470 619 ERel n =>
adamc@470 620 (case E.lookupERel env n of
adamc@470 621 (_, _, SOME e') => #1 e'
adamc@470 622 | _ => e)
adamc@470 623 | ENamed n =>
adamc@470 624 (case E.lookupENamed env n of
adamc@470 625 (_, _, SOME e', _) => ((*Print.prefaces "Switch" [("n", Print.PD.string (Int.toString n)),
adamc@470 626 ("e'", MonoPrint.p_exp env e')];*)
adamc@470 627 #1 e')
adamc@470 628 | _ => e)
adamc@470 629
adamc@470 630 | EApp ((EAbs (x, t, _, e1), loc), e2) =>
adamc@470 631 ((*Print.prefaces "Considering" [("e1", MonoPrint.p_exp (E.pushERel env x t NONE) e1),
adamc@694 632 ("e2", MonoPrint.p_exp env e2),
adamc@694 633 ("sub", MonoPrint.p_exp env (reduceExp env (subExpInExp (0, e2) e1)))];*)
adamc@975 634 if impure env e2 orelse countFree 0 0 e1 > 1 then
adamc@470 635 #1 (reduceExp env (ELet (x, t, e2, e1), loc))
adamc@470 636 else
adamc@470 637 #1 (reduceExp env (subExpInExp (0, e2) e1)))
adamc@470 638
adamc@470 639 | ECase (e', pes, {disc, result}) =>
adamc@442 640 let
adamc@470 641 fun push () =
adamc@470 642 case result of
adamc@470 643 (TFun (dom, result), loc) =>
adamc@1107 644 let
adamc@1107 645 fun safe (e, _) =
adamc@1107 646 case e of
adamc@1107 647 EAbs _ => true
adam@1445 648 | EError _ => true
adamc@1107 649 | _ => false
adamc@1107 650 in
adamc@1107 651 if List.all (safe o #2) pes then
adamc@1107 652 EAbs ("y", dom, result,
adamc@1107 653 (ECase (liftExpInExp 0 e',
adamc@1107 654 map (fn (p, (EAbs (_, _, _, e), _)) =>
adamc@1107 655 (p, swapExpVarsPat (0, patBinds p) e)
adam@1445 656 | (p, (EError (e, (TFun (_, t), _)), loc)) =>
adam@1445 657 (p, (EError (e, t), loc))
adamc@1107 658 | _ => raise Fail "MonoReduce ECase") pes,
adamc@1107 659 {disc = disc, result = result}), loc))
adamc@1107 660 else
adamc@1107 661 e
adamc@1107 662 end
adamc@470 663 | _ => e
adamc@318 664
adamc@470 665 fun search pes =
adamc@470 666 case pes of
adamc@470 667 [] => push ()
adamc@470 668 | (p, body) :: pes =>
adamc@814 669 case match ([], p, e') of
adamc@470 670 No => search pes
adamc@470 671 | Maybe => push ()
adamc@814 672 | Yes subs =>
adamc@800 673 let
adamc@829 674 val (body, remaining) =
adam@1804 675 foldl (fn ((x, t, e), (body, remaining)) =>
adam@1804 676 (if countFree 0 0 body > 1 then
adam@1804 677 (ELet (x, t, multiLift remaining e, body), #2 e')
adam@1804 678 else
adam@1804 679 subExpInExp (0, multiLift remaining e) body, remaining - 1))
adamc@829 680 (body, length subs - 1) subs
adamc@920 681 val r = reduceExp (E.patBinds env p) body
adamc@800 682 in
adamc@829 683 (*Print.preface ("subs", Print.p_list (MonoPrint.p_exp env) subs);*)
adamc@800 684 (*Print.prefaces "ECase"
adamc@829 685 [("old", MonoPrint.p_exp env body),
adamc@829 686 ("body", MonoPrint.p_exp env body),
adamc@800 687 ("r", MonoPrint.p_exp env r)];*)
adamc@800 688 #1 r
adamc@800 689 end
adamc@470 690 in
adamc@941 691 if impure env e' then
adamc@941 692 e
adamc@941 693 else
adamc@941 694 search pes
adamc@470 695 end
adamc@318 696
adamc@470 697 | EField ((ERecord xes, _), x) =>
adamc@470 698 (case List.find (fn (x', _, _) => x' = x) xes of
adamc@470 699 SOME (_, e, _) => #1 e
adamc@470 700 | NONE => e)
adamc@398 701
adamc@470 702 | ELet (x1, t1, (ELet (x2, t2, e1, b1), loc), b2) =>
adamc@470 703 let
adamc@470 704 val e' = (ELet (x2, t2, e1,
adamc@470 705 (ELet (x1, t1, b1,
adamc@470 706 liftExpInExp 1 b2), loc)), loc)
adamc@442 707 in
adamc@470 708 (*Print.prefaces "ELet commute" [("e", MonoPrint.p_exp env (e, loc)),
adamc@470 709 ("e'", MonoPrint.p_exp env e')];*)
adamc@470 710 #1 (reduceExp env e')
adamc@470 711 end
adamc@470 712 | EApp ((ELet (x, t, e, b), loc), e') =>
adamc@470 713 #1 (reduceExp env (ELet (x, t, e,
adamc@470 714 (EApp (b, liftExpInExp 0 e'), loc)), loc))
adamc@470 715
adamc@1017 716 | ELet (x, t, e', b as (EAbs (x', t' as (TRecord [], _), ran, e''), loc)) =>
adamc@919 717 if impure env e' then
adamc@1017 718 doLet (x, t, e', b)
adamc@848 719 else
adamc@920 720 EAbs (x', t', ran, reduceExp (E.pushERel env x' t' NONE)
adamc@920 721 (ELet (x, t, liftExpInExp 0 e', swapExpVars 0 e''), loc))
adamc@470 722
adamc@1017 723 | ELet (x, t, e', b) => doLet (x, t, e', b)
adamc@252 724
adamc@470 725 | EStrcat ((EPrim (Prim.String s1), _), (EPrim (Prim.String s2), _)) =>
adamc@470 726 EPrim (Prim.String (s1 ^ s2))
adamc@268 727
adamc@572 728 | ESignalBind ((ESignalReturn e1, loc), e2) =>
adamc@572 729 #1 (reduceExp env (EApp (e2, e1), loc))
adamc@572 730
adamc@470 731 | _ => e
adamc@470 732 in
adamc@829 733 (*Print.prefaces "exp'" [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan)),
adamc@829 734 ("r", MonoPrint.p_exp env (r, ErrorMsg.dummySpan))];*)
adamc@470 735 r
adamc@470 736 end
adamc@470 737
adamc@470 738 and bind (env, b) =
adamc@470 739 case b of
adamc@470 740 U.Decl.Datatype (x, n, xncs) => E.pushDatatype env x n xncs
adamc@470 741 | U.Decl.RelE (x, t) => E.pushERel env x t NONE
adamc@1017 742 | U.Decl.NamedE (x, n, t, eo, s) =>
adamc@1017 743 let
adamc@1017 744 val eo = case eo of
adamc@1017 745 NONE => NONE
adam@1393 746 | SOME e => if mayInline (n, e, t, s) then
adamc@1017 747 SOME e
adamc@1017 748 else
adamc@1017 749 NONE
adamc@1017 750 in
adamc@1017 751 E.pushENamed env x n t (Option.map (reduceExp env) eo) s
adamc@1017 752 end
adamc@470 753
adamc@470 754 and reduceExp env = U.Exp.mapB {typ = typ, exp = exp, bind = bind} env
adamc@470 755
adamc@801 756 fun decl env d = ((*Print.preface ("d", MonoPrint.p_decl env (d, ErrorMsg.dummySpan));*)
adamc@801 757 d)
adamc@398 758 in
adamc@470 759 U.File.mapB {typ = typ, exp = exp, decl = decl, bind = bind} E.empty file
adamc@398 760 end
adamc@133 761
adamc@133 762 end