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annotate src/mono_reduce.sml @ 1963:fec7beec96c7

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Make that purity analysis a bit more lax again
author Adam Chlipala <adam@chlipala.net>
date Sun, 19 Jan 2014 14:31:55 -0500
parents 16c219c74426
children b15a4c2cb542
rev   line source
adam@1848 1 (* Copyright (c) 2008, 2013, 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
adamc@133 42
adamc@948 43 fun simpleTypeImpure tsyms =
adamc@919 44 U.Typ.exists (fn TFun _ => true
adamc@948 45 | TDatatype (n, _) => IS.member (tsyms, n)
adamc@919 46 | _ => false)
adamc@919 47
adam@1963 48 fun simpleImpure isGlobal (tsyms, syms) =
adamc@919 49 U.Exp.existsB {typ = fn _ => false,
adamc@919 50 exp = fn (env, e) =>
adamc@919 51 case e of
adamc@919 52 EWrite _ => true
adamc@919 53 | EQuery _ => true
adamc@919 54 | EDml _ => true
adamc@919 55 | ENextval _ => true
adamc@1073 56 | ESetval _ => true
adamc@1171 57 | EFfiApp (m, x, _) => Settings.isEffectful (m, x) orelse Settings.isBenignEffectful (m, x)
adamc@919 58 | EServerCall _ => true
adamc@919 59 | ERecv _ => true
adamc@919 60 | ESleep _ => true
adamc@919 61 | ENamed n => IS.member (syms, n)
adamc@919 62 | ERel n =>
adamc@919 63 let
adamc@919 64 val (_, t, _) = E.lookupERel env n
adamc@919 65 in
adamc@948 66 simpleTypeImpure tsyms t
adamc@919 67 end
adam@1963 68 | EApp _ => not isGlobal
adamc@919 69 | _ => false,
adamc@919 70 bind = fn (env, b) =>
adamc@919 71 case b of
adamc@919 72 U.Exp.RelE (x, t) => E.pushERel env x t NONE
adamc@919 73 | _ => env}
adamc@916 74
adamc@252 75 fun impure (e, _) =
adamc@252 76 case e of
adamc@252 77 EWrite _ => true
adamc@252 78 | EQuery _ => true
adamc@307 79 | EDml _ => true
adamc@338 80 | ENextval _ => true
adamc@1073 81 | ESetval _ => true
adam@1423 82 | EUnurlify (e, _, _) => impure e
adamc@252 83 | EAbs _ => false
adamc@252 84
adamc@252 85 | EPrim _ => false
adamc@252 86 | ERel _ => false
adamc@252 87 | ENamed _ => false
adamc@252 88 | ECon (_, _, eo) => (case eo of NONE => false | SOME e => impure e)
adamc@297 89 | ENone _ => false
adamc@290 90 | ESome (_, e) => impure e
adamc@252 91 | EFfi _ => false
adamc@1171 92 | EFfiApp (m, x, _) => Settings.isEffectful (m, x) orelse Settings.isBenignEffectful (m, x)
adamc@252 93 | EApp ((EFfi _, _), _) => false
adamc@252 94 | EApp _ => true
adamc@252 95
adamc@387 96 | EUnop (_, e) => impure e
adam@1360 97 | EBinop (_, _, e1, e2) => impure e1 orelse impure e2
adamc@387 98
adamc@252 99 | ERecord xes => List.exists (fn (_, e, _) => impure e) xes
adamc@252 100 | EField (e, _) => impure e
adamc@252 101
adamc@252 102 | ECase (e, pes, _) => impure e orelse List.exists (fn (_, e) => impure e) pes
adamc@252 103
adamc@1069 104 | EError _ => true
adam@1932 105 | EReturnBlob {blob = NONE, mimeType = e2, ...} => impure e2
adam@1932 106 | EReturnBlob {blob = SOME e1, mimeType = e2, ...} => impure e1 orelse impure e2
adamc@1065 107 | ERedirect (e, _) => impure e
adamc@283 108
adamc@252 109 | EStrcat (e1, e2) => impure e1 orelse impure e2
adamc@252 110
adamc@252 111 | ESeq (e1, e2) => impure e1 orelse impure e2
adamc@252 112 | ELet (_, _, e1, e2) => impure e1 orelse impure e2
adamc@252 113
adamc@252 114 | EClosure (_, es) => List.exists impure es
adamc@815 115 | EJavaScript (_, e) => impure e
adamc@568 116 | ESignalReturn e => impure e
adamc@572 117 | ESignalBind (e1, e2) => impure e1 orelse impure e2
adamc@574 118 | ESignalSource e => impure e
adamc@608 119 | EServerCall _ => true
adamc@670 120 | ERecv _ => true
adamc@695 121 | ESleep _ => true
adamc@1021 122 | ESpawn _ => true
adamc@252 123
adamc@252 124 val liftExpInExp = Monoize.liftExpInExp
adamc@252 125
adamc@829 126 fun multiLift n e =
adamc@829 127 case n of
adamc@829 128 0 => e
adamc@829 129 | _ => multiLift (n - 1) (liftExpInExp 0 e)
adamc@829 130
adamc@252 131 val subExpInExp' =
adamc@133 132 U.Exp.mapB {typ = fn t => t,
adamc@133 133 exp = fn (xn, rep) => fn e =>
adamc@133 134 case e of
adamc@133 135 ERel xn' =>
adamc@133 136 (case Int.compare (xn', xn) of
adamc@133 137 EQUAL => #1 rep
adamc@133 138 | GREATER=> ERel (xn' - 1)
adamc@133 139 | LESS => e)
adamc@133 140 | _ => e,
adamc@133 141 bind = fn ((xn, rep), U.Exp.RelE _) => (xn+1, liftExpInExp 0 rep)
adamc@133 142 | (ctx, _) => ctx}
adamc@133 143
adamc@252 144 fun subExpInExp (n, e1) e2 =
adamc@252 145 let
adamc@252 146 val r = subExpInExp' (n, e1) e2
adamc@252 147 in
adamc@252 148 (*Print.prefaces "subExpInExp" [("e1", MonoPrint.p_exp MonoEnv.empty e1),
adamc@252 149 ("e2", MonoPrint.p_exp MonoEnv.empty e2),
adamc@252 150 ("r", MonoPrint.p_exp MonoEnv.empty r)];*)
adamc@252 151 r
adamc@252 152 end
adamc@133 153
adamc@133 154 fun typ c = c
adamc@133 155
adamc@316 156 val swapExpVars =
adamc@316 157 U.Exp.mapB {typ = fn t => t,
adamc@316 158 exp = fn lower => fn e =>
adamc@316 159 case e of
adamc@316 160 ERel xn =>
adamc@316 161 if xn = lower then
adamc@316 162 ERel (lower + 1)
adamc@316 163 else if xn = lower + 1 then
adamc@316 164 ERel lower
adamc@316 165 else
adamc@316 166 e
adamc@316 167 | _ => e,
adamc@316 168 bind = fn (lower, U.Exp.RelE _) => lower+1
adamc@316 169 | (lower, _) => lower}
adamc@316 170
adamc@341 171 val swapExpVarsPat =
adamc@341 172 U.Exp.mapB {typ = fn t => t,
adamc@341 173 exp = fn (lower, len) => fn e =>
adamc@341 174 case e of
adamc@341 175 ERel xn =>
adamc@341 176 if xn = lower then
adamc@827 177 ERel (lower + len)
adamc@341 178 else if xn >= lower + 1 andalso xn < lower + 1 + len then
adamc@341 179 ERel (xn - 1)
adamc@341 180 else
adamc@341 181 e
adamc@341 182 | _ => e,
adamc@341 183 bind = fn ((lower, len), U.Exp.RelE _) => (lower+1, len)
adamc@341 184 | (st, _) => st}
adamc@341 185
adam@1817 186 datatype result = Yes of (string * typ * exp) list | No | Maybe
adamc@258 187
adamc@183 188 fun match (env, p : pat, e : exp) =
adamc@183 189 case (#1 p, #1 e) of
adamc@258 190 (PWild, _) => Yes env
adam@1817 191 | (PVar (x, t), _) => Yes ((x, t, e) :: env)
adamc@183 192
adamc@280 193 | (PPrim (Prim.String s), EStrcat ((EPrim (Prim.String s'), _), _)) =>
adamc@280 194 if String.isPrefix s' s then
adamc@280 195 Maybe
adamc@280 196 else
adamc@280 197 No
adamc@280 198
adamc@1207 199 | (PPrim (Prim.String s), EStrcat (_, (EPrim (Prim.String s'), _))) =>
adamc@1207 200 if String.isSuffix s' s then
adamc@1207 201 Maybe
adamc@1207 202 else
adamc@1207 203 No
adamc@1207 204
adamc@183 205 | (PPrim p, EPrim p') =>
adamc@183 206 if Prim.equal (p, p') then
adamc@258 207 Yes env
adamc@183 208 else
adamc@258 209 No
adamc@183 210
kkallio@1489 211 | (PCon (_, PConVar n1, po), ECon (_, PConVar n2, eo)) =>
adamc@183 212 if n1 = n2 then
kkallio@1489 213 case (po, eo) of
kkallio@1489 214 (NONE, NONE) => Yes env
kkallio@1489 215 | (SOME p, SOME e) => match (env, p, e)
kkallio@1489 216 | _ => Maybe
adamc@183 217 else
adamc@258 218 No
adamc@183 219
adamc@188 220 | (PCon (_, PConFfi {mod = m1, con = con1, ...}, NONE), ECon (_, PConFfi {mod = m2, con = con2, ...}, NONE)) =>
adamc@185 221 if m1 = m2 andalso con1 = con2 then
adamc@258 222 Yes env
adamc@185 223 else
adamc@258 224 No
adamc@185 225
adamc@188 226 | (PCon (_, PConFfi {mod = m1, con = con1, ...}, SOME ep), ECon (_, PConFfi {mod = m2, con = con2, ...}, SOME e)) =>
adamc@185 227 if m1 = m2 andalso con1 = con2 then
adamc@185 228 match (env, p, e)
adamc@185 229 else
adamc@258 230 No
adamc@185 231
adamc@183 232 | (PRecord xps, ERecord xes) =>
adamc@183 233 let
adamc@183 234 fun consider (xps, env) =
adamc@183 235 case xps of
adamc@258 236 [] => Yes env
adamc@183 237 | (x, p, _) :: rest =>
adamc@183 238 case List.find (fn (x', _, _) => x' = x) xes of
adamc@258 239 NONE => No
adamc@183 240 | SOME (_, e, _) =>
adamc@183 241 case match (env, p, e) of
adamc@258 242 No => No
adamc@258 243 | Maybe => Maybe
adamc@258 244 | Yes env => consider (rest, env)
adamc@183 245 in
adamc@183 246 consider (xps, env)
adamc@183 247 end
adamc@183 248
adamc@726 249 | (PNone _, ENone _) => Yes env
adamc@921 250 | (PNone _, ESome _) => No
adamc@726 251 | (PSome (_, p), ESome (_, e)) => match (env, p, e)
adamc@921 252 | (PSome _, ENone _) => No
adamc@726 253
adamc@258 254 | _ => Maybe
adamc@183 255
adamc@318 256 datatype event =
adamc@318 257 WritePage
adamc@318 258 | ReadDb
adamc@318 259 | WriteDb
adamc@1225 260 | ReadCookie
adamc@1225 261 | WriteCookie
adamc@481 262 | UseRel
adamc@318 263 | Unsure
adamc@1225 264 | Abort
adamc@318 265
adamc@318 266 fun p_event e =
adamc@318 267 let
adamc@318 268 open Print.PD
adamc@318 269 in
adamc@318 270 case e of
adamc@318 271 WritePage => string "WritePage"
adamc@318 272 | ReadDb => string "ReadDb"
adamc@318 273 | WriteDb => string "WriteDb"
adamc@1225 274 | ReadCookie => string "ReadCookie"
adamc@1225 275 | WriteCookie => string "WriteCookie"
adamc@481 276 | UseRel => string "UseRel"
adamc@318 277 | Unsure => string "Unsure"
adamc@1225 278 | Abort => string "Abort"
adamc@318 279 end
adamc@318 280
adamc@470 281 val p_events = Print.p_list p_event
adamc@470 282
adamc@318 283 fun patBinds (p, _) =
adamc@318 284 case p of
adamc@318 285 PWild => 0
adamc@318 286 | PVar _ => 1
adamc@318 287 | PPrim _ => 0
adamc@318 288 | PCon (_, _, NONE) => 0
adamc@318 289 | PCon (_, _, SOME p) => patBinds p
adamc@318 290 | PRecord xpts => foldl (fn ((_, p, _), n) => n + patBinds p) 0 xpts
adamc@318 291 | PNone _ => 0
adamc@318 292 | PSome (_, p) => patBinds p
adamc@318 293
adamc@932 294 val countFree = U.Exp.foldB {typ = fn (_, n) => n,
adamc@932 295 exp = fn (x, e, n) =>
adamc@932 296 case e of
adamc@932 297 ERel x' => if x = x' then n + 1 else n
adamc@932 298 | _ => n,
adamc@932 299 bind = fn (n, b) =>
adamc@932 300 case b of
adamc@932 301 U.Exp.RelE _ => n + 1
adamc@975 302 | _ => n}
adamc@975 303
adamc@975 304 val freeInAbs = U.Exp.existsB {typ = fn _ => false,
adamc@975 305 exp = fn (n, e) =>
adamc@975 306 case e of
adamc@975 307 EAbs (_, _, _, b) => countFree n 0 b > 0
adamc@975 308 | EJavaScript (_, b) => countFree n 0 b > 0
adamc@975 309 | _ => false,
adamc@975 310 bind = fn (n, b) =>
adamc@975 311 case b of
adamc@975 312 U.Exp.RelE _ => n + 1
adamc@975 313 | _ => n} 0
adamc@932 314
adam@1845 315 fun reduce (file : file) =
adamc@470 316 let
adamc@948 317 val (timpures, impures, absCounts) =
adamc@948 318 foldl (fn ((d, _), (timpures, impures, absCounts)) =>
adamc@916 319 let
adam@1820 320 fun countAbs env e =
adam@1820 321 case #1 e of
adam@1820 322 EAbs (x, t, _, e) => 1 + countAbs (E.pushERel env x t NONE) e
adam@1820 323 | _ =>
adam@1820 324 let
adam@1820 325 fun remaining e =
adam@1820 326 case #1 e of
adam@1820 327 ENamed n => IM.find (absCounts, n)
adam@1820 328 | EApp (e, arg) =>
adam@1963 329 if simpleImpure true (timpures, impures) env arg then
adam@1820 330 NONE
adam@1820 331 else
adam@1820 332 (case remaining e of
adam@1820 333 NONE => NONE
adam@1820 334 | SOME n => if n > 0 then
adam@1820 335 SOME (n - 1)
adam@1820 336 else
adam@1820 337 NONE)
adam@1820 338 | _ => NONE
adam@1820 339 in
adam@1820 340 getOpt (remaining e, 0)
adam@1820 341 end
adamc@916 342 in
adamc@916 343 case d of
adamc@948 344 DDatatype dts =>
adamc@948 345 (if List.exists (fn (_, _, cs) =>
adamc@948 346 List.exists (fn (_, _, NONE) => false
adamc@948 347 | (_, _, SOME t) => simpleTypeImpure timpures t) cs)
adamc@948 348 dts then
adamc@948 349 IS.addList (timpures, map #2 dts)
adamc@948 350 else
adamc@948 351 timpures,
adamc@948 352 impures,
adamc@948 353 absCounts)
adamc@948 354 | DVal (_, n, _, e, _) =>
adamc@948 355 (timpures,
adam@1963 356 if simpleImpure true (timpures, impures) E.empty e then
adamc@916 357 IS.add (impures, n)
adamc@916 358 else
adamc@916 359 impures,
adam@1820 360 IM.insert (absCounts, n, countAbs E.empty e))
adamc@916 361 | DValRec vis =>
adamc@948 362 (timpures,
adam@1963 363 if List.exists (fn (_, _, _, e, _) => simpleImpure true (timpures, impures) E.empty e) vis then
adamc@916 364 foldl (fn ((_, n, _, _, _), impures) =>
adamc@916 365 IS.add (impures, n)) impures vis
adamc@916 366 else
adamc@916 367 impures,
adamc@916 368 foldl (fn ((x, n, _, e, _), absCounts) =>
adam@1820 369 IM.insert (absCounts, n, countAbs E.empty e))
adamc@916 370 absCounts vis)
adamc@948 371 | _ => (timpures, impures, absCounts)
adamc@916 372 end)
adam@1845 373 (IS.empty, IS.empty, IM.empty) (#1 file)
adamc@387 374
adamc@1017 375 val uses = U.File.fold {typ = fn (_, m) => m,
adamc@1017 376 exp = fn (e, m) =>
adamc@1017 377 case e of
adamc@1017 378 ENamed n => IM.insert (m, n, 1 + Option.getOpt (IM.find (m, n), 0))
adamc@1017 379 | _ => m,
adamc@1017 380 decl = fn (_, m) => m}
adamc@1017 381 IM.empty file
adamc@1017 382
adamc@1017 383 val size = U.Exp.fold {typ = fn (_, n) => n,
adamc@1017 384 exp = fn (_, n) => n + 1} 0
adamc@1017 385
adam@1360 386 val functionInside' = U.Typ.exists (fn c => case c of
adam@1360 387 TFun _ => true
adam@1360 388 | _ => false)
adam@1360 389
adam@1360 390 fun functionInside t =
adam@1360 391 case #1 t of
adam@1360 392 TFun (t1, t2) => functionInside' t1 orelse functionInside t2
adam@1360 393 | _ => functionInside' t
adam@1360 394
adam@1393 395 fun mayInline (n, e, t, s) =
adamc@1017 396 case IM.find (uses, n) of
adamc@1017 397 NONE => false
adamc@1017 398 | SOME count => count <= 1
adamc@1017 399 orelse size e <= Settings.getMonoInline ()
adam@1360 400 orelse functionInside t
adam@1393 401 orelse Settings.checkAlwaysInline s
adamc@1017 402
adamc@470 403 fun summarize d (e, _) =
adamc@579 404 let
adamc@579 405 val s =
adamc@579 406 case e of
adamc@579 407 EPrim _ => []
adamc@579 408 | ERel n => if n = d then [UseRel] else []
adamc@579 409 | ENamed _ => []
adamc@579 410 | ECon (_, _, NONE) => []
adamc@579 411 | ECon (_, _, SOME e) => summarize d e
adamc@579 412 | ENone _ => []
adamc@579 413 | ESome (_, e) => summarize d e
adamc@579 414 | EFfi _ => []
adam@1663 415 | EFfiApp ("Basis", "get_cookie", [(e, _)]) =>
adamc@1225 416 summarize d e @ [ReadCookie]
adam@1423 417 | EFfiApp ("Basis", "set_cookie", es) =>
adam@1663 418 List.concat (map (summarize d o #1) es) @ [WriteCookie]
adam@1423 419 | EFfiApp ("Basis", "clear_cookie", es) =>
adam@1663 420 List.concat (map (summarize d o #1) es) @ [WriteCookie]
adamc@765 421 | EFfiApp (m, x, es) =>
adamc@1171 422 if Settings.isEffectful (m, x) orelse Settings.isBenignEffectful (m, x) then
adam@1663 423 List.concat (map (summarize d o #1) es) @ [if m = "Basis" andalso String.isSuffix "_w" x then
adam@1663 424 WritePage
adam@1663 425 else
adam@1663 426 Unsure]
adamc@765 427 else
adam@1663 428 List.concat (map (summarize d o #1) es)
adamc@579 429 | EApp ((EFfi _, _), e) => summarize d e
adamc@579 430 | EApp _ =>
adamc@579 431 let
adamc@694 432 fun unravel (e, passed, ls) =
adamc@579 433 case e of
adamc@579 434 ENamed n =>
adamc@579 435 let
adamc@579 436 val ls = rev ls
adamc@579 437 in
adamc@948 438 if IS.member (impures, n) then
adamc@948 439 case IM.find (absCounts, n) of
adamc@948 440 NONE => [Unsure]
adamc@948 441 | SOME len =>
adamc@948 442 if passed < len then
adamc@948 443 ls
adamc@948 444 else
adamc@948 445 ls @ [Unsure]
adamc@948 446 else
adamc@948 447 ls
adamc@579 448 end
adamc@579 449 | ERel n => List.revAppend (ls,
adamc@579 450 if n = d then
adamc@579 451 [UseRel, Unsure]
adamc@579 452 else
adamc@579 453 [Unsure])
adamc@579 454 | EApp (f, x) =>
adamc@995 455 unravel (#1 f, passed + 1, List.revAppend (summarize d x,
adamc@995 456 ls))
adam@1394 457 | EError _ => [Abort]
adamc@579 458 | _ => [Unsure]
adamc@579 459 in
adamc@694 460 unravel (e, 0, [])
adamc@579 461 end
adamc@252 462
adamc@941 463 | EAbs _ => []
adamc@316 464
adamc@579 465 | EUnop (_, e) => summarize d e
adam@1360 466 | EBinop (_, _, e1, e2) => summarize d e1 @ summarize d e2
adamc@470 467
adamc@579 468 | ERecord xets => List.concat (map (summarize d o #2) xets)
adamc@579 469 | EField (e, _) => summarize d e
adamc@470 470
adamc@1214 471 | ECase (e, pes, _) =>
adamc@1214 472 let
adamc@579 473 val lss = map (fn (p, e) => summarize (d + patBinds p) e) pes
adam@1394 474
adam@1394 475 fun splitRel ls acc =
adam@1394 476 case ls of
adam@1394 477 [] => (acc, false, ls)
adam@1394 478 | UseRel :: ls => (acc, true, ls)
adam@1394 479 | v :: ls => splitRel ls (v :: acc)
adam@1394 480
adam@1394 481 val (pre, used, post) = foldl (fn (ls, (pre, used, post)) =>
adam@1394 482 let
adam@1394 483 val (pre', used', post') = splitRel ls []
adam@1394 484 in
adam@1394 485 (pre' @ pre, used' orelse used, post' @ post)
adam@1394 486 end)
adam@1394 487 ([], false, []) lss
adamc@579 488 in
adam@1394 489 summarize d e
adam@1394 490 @ pre
adam@1394 491 @ (if used then [UseRel] else [])
adam@1394 492 @ post
adamc@1214 493 end
adamc@579 494 | EStrcat (e1, e2) => summarize d e1 @ summarize d e2
adamc@316 495
adamc@1225 496 | EError (e, _) => summarize d e @ [Abort]
adam@1932 497 | EReturnBlob {blob = NONE, mimeType = e2, ...} => summarize d e2 @ [Abort]
adam@1932 498 | EReturnBlob {blob = SOME e1, mimeType = e2, ...} => summarize d e1 @ summarize d e2 @ [Abort]
adamc@1225 499 | ERedirect (e, _) => summarize d e @ [Abort]
adamc@318 500
adamc@579 501 | EWrite e => summarize d e @ [WritePage]
adamc@579 502
adamc@579 503 | ESeq (e1, e2) => summarize d e1 @ summarize d e2
adamc@579 504 | ELet (_, _, e1, e2) => summarize d e1 @ summarize (d + 1) e2
adamc@456 505
adamc@579 506 | EClosure (_, es) => List.concat (map (summarize d) es)
adamc@470 507
adamc@579 508 | EQuery {query, body, initial, ...} =>
adamc@579 509 List.concat [summarize d query,
adamc@579 510 summarize d initial,
adamc@941 511 [ReadDb],
adamc@941 512 summarize (d + 2) body]
adamc@470 513
adam@1293 514 | EDml (e, _) => summarize d e @ [WriteDb]
adamc@579 515 | ENextval e => summarize d e @ [WriteDb]
adamc@1073 516 | ESetval (e1, e2) => summarize d e1 @ summarize d e2 @ [WriteDb]
adamc@1112 517 | EUnurlify (e, _, _) => summarize d e
adamc@815 518 | EJavaScript (_, e) => summarize d e
adamc@579 519 | ESignalReturn e => summarize d e
adamc@579 520 | ESignalBind (e1, e2) => summarize d e1 @ summarize d e2
adamc@579 521 | ESignalSource e => summarize d e
adamc@608 522
adam@1848 523 | EServerCall (e, _, _, _) => summarize d e @ [Unsure]
adamc@1021 524 | ERecv (e, _) => summarize d e @ [Unsure]
adamc@1021 525 | ESleep e => summarize d e @ [Unsure]
adamc@1021 526 | ESpawn e => summarize d e @ [Unsure]
adamc@579 527 in
adamc@579 528 (*Print.prefaces "Summarize"
adamc@579 529 [("e", MonoPrint.p_exp MonoEnv.empty (e, ErrorMsg.dummySpan)),
adamc@579 530 ("d", Print.PD.string (Int.toString d)),
adamc@579 531 ("s", p_events s)];*)
adamc@579 532 s
adamc@579 533 end
adamc@470 534
adamc@919 535 val impure = fn env => fn e =>
adam@1963 536 simpleImpure false (timpures, impures) env e andalso impure e
adamc@916 537 andalso not (List.null (summarize ~1 e))
adamc@916 538
adam@1852 539 fun passive (e : exp) =
adam@1852 540 case #1 e of
adam@1852 541 EPrim _ => true
adam@1852 542 | ERel _ => true
adam@1852 543 | ENamed _ => true
adam@1852 544 | ECon (_, _, NONE) => true
adam@1852 545 | ECon (_, _, SOME e) => passive e
adam@1852 546 | ENone _ => true
adam@1852 547 | ESome (_, e) => passive e
adam@1852 548 | EFfi _ => true
adam@1852 549 | EAbs _ => true
adam@1852 550 | ERecord xets => List.all (passive o #2) xets
adam@1852 551 | EField (e, _) => passive e
adam@1852 552 | _ => false
adam@1852 553
adamc@470 554 fun exp env e =
adamc@470 555 let
adamc@470 556 (*val () = Print.prefaces "exp" [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan))]*)
adamc@470 557
adamc@1017 558 fun doLet (x, t, e', b) =
adamc@1017 559 let
adamc@1017 560 fun doSub () =
adamc@1017 561 let
adamc@1017 562 val r = subExpInExp (0, e') b
adamc@1017 563 in
adamc@1017 564 (*Print.prefaces "doSub" [("e'", MonoPrint.p_exp env e'),
adam@1423 565 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adam@1423 566 ("r", MonoPrint.p_exp env r)];*)
adamc@1017 567 #1 (reduceExp env r)
adamc@1017 568 end
adamc@1017 569
adam@1855 570 fun trySub () =
adamc@1017 571 ((*Print.prefaces "trySub"
adamc@1017 572 [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan))];*)
adamc@1017 573 case t of
adamc@1017 574 (TFfi ("Basis", "string"), _) => doSub ()
adamc@1017 575 | (TSignal _, _) => e
adamc@1017 576 | _ =>
adam@1855 577 case e' of
adam@1855 578 (ECase _, _) => e
adam@1855 579 | _ => doSub ())
adamc@1017 580 in
adamc@1017 581 if impure env e' then
adamc@1017 582 let
adamc@1017 583 val effs_e' = summarize 0 e'
adamc@1017 584 val effs_e' = List.filter (fn x => x <> UseRel) effs_e'
adamc@1017 585 val effs_b = summarize 0 b
adamc@1017 586
adam@1394 587 (*val () = Print.fprefaces outf "Try"
adam@1394 588 [(*("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan)),*)
adamc@1017 589 ("e'", MonoPrint.p_exp env e'),
adamc@1017 590 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adamc@1017 591 ("e'_eff", p_events effs_e'),
adamc@1017 592 ("b_eff", p_events effs_b)]*)
adamc@1017 593
adamc@1017 594 fun does eff = List.exists (fn eff' => eff' = eff) effs_e'
adamc@1017 595 val writesPage = does WritePage
adamc@1017 596 val readsDb = does ReadDb
adamc@1017 597 val writesDb = does WriteDb
adamc@1225 598 val readsCookie = does ReadCookie
adamc@1225 599 val writesCookie = does ReadCookie
adamc@1017 600
adamc@1017 601 fun verifyUnused eff =
adamc@1017 602 case eff of
adamc@1017 603 UseRel => false
adamc@1017 604 | _ => true
adamc@1017 605
adamc@1017 606 fun verifyCompatible effs =
adamc@1017 607 case effs of
adamc@1017 608 [] => false
adamc@1017 609 | eff :: effs =>
adamc@1017 610 case eff of
adamc@1017 611 Unsure => false
adamc@1017 612 | UseRel => List.all verifyUnused effs
adamc@1017 613 | WritePage => not writesPage andalso verifyCompatible effs
adamc@1017 614 | ReadDb => not writesDb andalso verifyCompatible effs
adamc@1017 615 | WriteDb => not writesDb andalso not readsDb andalso verifyCompatible effs
adamc@1225 616 | ReadCookie => not writesCookie andalso verifyCompatible effs
adamc@1225 617 | WriteCookie => not writesCookie andalso not readsCookie
adamc@1225 618 andalso verifyCompatible effs
adamc@1225 619 | Abort => true
adamc@1017 620 in
adamc@1017 621 (*Print.prefaces "verifyCompatible"
adamc@1017 622 [("e'", MonoPrint.p_exp env e'),
adamc@1017 623 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adamc@1017 624 ("effs_e'", Print.p_list p_event effs_e'),
adamc@1017 625 ("effs_b", Print.p_list p_event effs_b)];*)
adamc@1017 626 if (List.null effs_e'
adamc@1017 627 orelse (List.all (fn eff => eff <> Unsure) effs_e'
adamc@1017 628 andalso verifyCompatible effs_b)
adamc@1017 629 orelse (case effs_b of
adamc@1017 630 UseRel :: effs => List.all verifyUnused effs
adamc@1017 631 | _ => false))
adamc@1017 632 andalso countFree 0 0 b = 1
adamc@1017 633 andalso not (freeInAbs b) then
adam@1855 634 trySub ()
adamc@1017 635 else
adamc@1017 636 e
adamc@1017 637 end
adam@1852 638 else if countFree 0 0 b > 1 andalso not (!fullMode) andalso not (passive e') then
adam@1817 639 e
adamc@1017 640 else
adam@1855 641 trySub ()
adamc@1017 642 end
adamc@1017 643
adamc@470 644 val r =
adamc@470 645 case e of
adamc@470 646 ERel n =>
adamc@470 647 (case E.lookupERel env n of
adamc@470 648 (_, _, SOME e') => #1 e'
adamc@470 649 | _ => e)
adamc@470 650 | ENamed n =>
adamc@470 651 (case E.lookupENamed env n of
adamc@470 652 (_, _, SOME e', _) => ((*Print.prefaces "Switch" [("n", Print.PD.string (Int.toString n)),
adamc@470 653 ("e'", MonoPrint.p_exp env e')];*)
adamc@470 654 #1 e')
adamc@470 655 | _ => e)
adamc@470 656
adamc@470 657 | EApp ((EAbs (x, t, _, e1), loc), e2) =>
adamc@470 658 ((*Print.prefaces "Considering" [("e1", MonoPrint.p_exp (E.pushERel env x t NONE) e1),
adamc@694 659 ("e2", MonoPrint.p_exp env e2),
adamc@694 660 ("sub", MonoPrint.p_exp env (reduceExp env (subExpInExp (0, e2) e1)))];*)
adam@1852 661 if impure env e2 orelse (not (!fullMode) andalso countFree 0 0 e1 > 1) then
adamc@470 662 #1 (reduceExp env (ELet (x, t, e2, e1), loc))
adamc@470 663 else
adamc@470 664 #1 (reduceExp env (subExpInExp (0, e2) e1)))
adamc@470 665
adamc@470 666 | ECase (e', pes, {disc, result}) =>
adamc@442 667 let
adamc@470 668 fun push () =
adamc@470 669 case result of
adamc@470 670 (TFun (dom, result), loc) =>
adamc@1107 671 let
adam@1855 672 fun safe e =
adam@1855 673 List.all (fn UseRel => true
adam@1855 674 | Abort => true
adam@1855 675 | _ => false) (summarize 0 e)
adam@1855 676
adam@1855 677 fun p_events' es = Print.box [Print.PD.string "{",
adam@1855 678 p_events es,
adam@1855 679 Print.PD.string "}"]
adamc@1107 680 in
adamc@1107 681 if List.all (safe o #2) pes then
adamc@1107 682 EAbs ("y", dom, result,
adamc@1107 683 (ECase (liftExpInExp 0 e',
adamc@1107 684 map (fn (p, (EAbs (_, _, _, e), _)) =>
adamc@1107 685 (p, swapExpVarsPat (0, patBinds p) e)
adam@1445 686 | (p, (EError (e, (TFun (_, t), _)), loc)) =>
adam@1445 687 (p, (EError (e, t), loc))
adam@1855 688 | (p, e) =>
adam@1855 689 (p, (EApp (liftExpInExp (patBinds p) e,
adam@1855 690 (ERel (patBinds p), loc)), loc)))
adam@1855 691 pes,
adamc@1107 692 {disc = disc, result = result}), loc))
adamc@1107 693 else
adamc@1107 694 e
adamc@1107 695 end
adamc@470 696 | _ => e
adamc@318 697
adamc@470 698 fun search pes =
adamc@470 699 case pes of
adamc@470 700 [] => push ()
adamc@470 701 | (p, body) :: pes =>
adamc@814 702 case match ([], p, e') of
adamc@470 703 No => search pes
adamc@470 704 | Maybe => push ()
adamc@814 705 | Yes subs =>
adamc@800 706 let
adamc@829 707 val (body, remaining) =
adam@1817 708 foldl (fn ((x, t, e), (body, remaining)) =>
adam@1817 709 (if countFree 0 0 body > 1 then
adam@1817 710 (ELet (x, t, multiLift remaining e, body), #2 e')
adam@1817 711 else
adam@1817 712 subExpInExp (0, multiLift remaining e) body, remaining - 1))
adamc@829 713 (body, length subs - 1) subs
adamc@920 714 val r = reduceExp (E.patBinds env p) body
adamc@800 715 in
adamc@829 716 (*Print.preface ("subs", Print.p_list (MonoPrint.p_exp env) subs);*)
adamc@800 717 (*Print.prefaces "ECase"
adamc@829 718 [("old", MonoPrint.p_exp env body),
adamc@829 719 ("body", MonoPrint.p_exp env body),
adamc@800 720 ("r", MonoPrint.p_exp env r)];*)
adamc@800 721 #1 r
adamc@800 722 end
adamc@470 723 in
adamc@941 724 if impure env e' then
adamc@941 725 e
adamc@941 726 else
adamc@941 727 search pes
adamc@470 728 end
adamc@318 729
adamc@470 730 | EField ((ERecord xes, _), x) =>
adamc@470 731 (case List.find (fn (x', _, _) => x' = x) xes of
adamc@470 732 SOME (_, e, _) => #1 e
adamc@470 733 | NONE => e)
adamc@398 734
adamc@470 735 | ELet (x1, t1, (ELet (x2, t2, e1, b1), loc), b2) =>
adamc@470 736 let
adamc@470 737 val e' = (ELet (x2, t2, e1,
adamc@470 738 (ELet (x1, t1, b1,
adamc@470 739 liftExpInExp 1 b2), loc)), loc)
adamc@442 740 in
adamc@470 741 (*Print.prefaces "ELet commute" [("e", MonoPrint.p_exp env (e, loc)),
adamc@470 742 ("e'", MonoPrint.p_exp env e')];*)
adamc@470 743 #1 (reduceExp env e')
adamc@470 744 end
adamc@470 745 | EApp ((ELet (x, t, e, b), loc), e') =>
adamc@470 746 #1 (reduceExp env (ELet (x, t, e,
adamc@470 747 (EApp (b, liftExpInExp 0 e'), loc)), loc))
adamc@470 748
adamc@1017 749 | ELet (x, t, e', b as (EAbs (x', t' as (TRecord [], _), ran, e''), loc)) =>
adamc@919 750 if impure env e' then
adamc@1017 751 doLet (x, t, e', b)
adamc@848 752 else
adamc@920 753 EAbs (x', t', ran, reduceExp (E.pushERel env x' t' NONE)
adamc@920 754 (ELet (x, t, liftExpInExp 0 e', swapExpVars 0 e''), loc))
adamc@470 755
adamc@1017 756 | ELet (x, t, e', b) => doLet (x, t, e', b)
adamc@252 757
adamc@470 758 | EStrcat ((EPrim (Prim.String s1), _), (EPrim (Prim.String s2), _)) =>
adamc@470 759 EPrim (Prim.String (s1 ^ s2))
adamc@268 760
adamc@572 761 | ESignalBind ((ESignalReturn e1, loc), e2) =>
adamc@572 762 #1 (reduceExp env (EApp (e2, e1), loc))
adamc@572 763
adamc@470 764 | _ => e
adamc@470 765 in
adamc@829 766 (*Print.prefaces "exp'" [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan)),
adamc@829 767 ("r", MonoPrint.p_exp env (r, ErrorMsg.dummySpan))];*)
adamc@470 768 r
adamc@470 769 end
adamc@470 770
adamc@470 771 and bind (env, b) =
adamc@470 772 case b of
adamc@470 773 U.Decl.Datatype (x, n, xncs) => E.pushDatatype env x n xncs
adamc@470 774 | U.Decl.RelE (x, t) => E.pushERel env x t NONE
adamc@1017 775 | U.Decl.NamedE (x, n, t, eo, s) =>
adamc@1017 776 let
adamc@1017 777 val eo = case eo of
adamc@1017 778 NONE => NONE
adam@1393 779 | SOME e => if mayInline (n, e, t, s) then
adamc@1017 780 SOME e
adamc@1017 781 else
adamc@1017 782 NONE
adamc@1017 783 in
adamc@1017 784 E.pushENamed env x n t (Option.map (reduceExp env) eo) s
adamc@1017 785 end
adamc@470 786
adamc@470 787 and reduceExp env = U.Exp.mapB {typ = typ, exp = exp, bind = bind} env
adamc@470 788
adamc@801 789 fun decl env d = ((*Print.preface ("d", MonoPrint.p_decl env (d, ErrorMsg.dummySpan));*)
adamc@801 790 d)
adamc@398 791 in
adamc@470 792 U.File.mapB {typ = typ, exp = exp, decl = decl, bind = bind} E.empty file
adamc@398 793 end
adamc@133 794
adamc@133 795 end