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annotate src/mono_reduce.sml @ 668:b0c1a46b1f15

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author Adam Chlipala <adamc@hcoop.net>
date Sun, 22 Mar 2009 15:05:07 -0400
parents 5891f47d7cff
children f73913d97a40
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@470 38
adamc@133 39
adamc@252 40 fun impure (e, _) =
adamc@252 41 case e of
adamc@252 42 EWrite _ => true
adamc@252 43 | EQuery _ => true
adamc@307 44 | EDml _ => true
adamc@338 45 | ENextval _ => true
adamc@463 46 | EUnurlify _ => true
adamc@252 47 | EAbs _ => false
adamc@252 48
adamc@252 49 | EPrim _ => false
adamc@252 50 | ERel _ => false
adamc@252 51 | ENamed _ => false
adamc@252 52 | ECon (_, _, eo) => (case eo of NONE => false | SOME e => impure e)
adamc@297 53 | ENone _ => false
adamc@290 54 | ESome (_, e) => impure e
adamc@252 55 | EFfi _ => false
adamc@462 56 | EFfiApp ("Basis", "set_cookie", _) => true
adamc@565 57 | EFfiApp ("Basis", "new_client_source", _) => true
adamc@577 58 | EFfiApp ("Basis", "set_client_source", _) => true
adamc@579 59 | EFfiApp ("Basis", "alert", _) => true
adamc@668 60 | EFfiApp ("Basis", "new_channel", _) => true
adamc@668 61 | EFfiApp ("Basis", "subscribe", _) => true
adamc@668 62 | EFfiApp ("Basis", "send", _) => true
adamc@252 63 | EFfiApp _ => false
adamc@252 64 | EApp ((EFfi _, _), _) => false
adamc@252 65 | EApp _ => true
adamc@252 66
adamc@387 67 | EUnop (_, e) => impure e
adamc@387 68 | EBinop (_, e1, e2) => impure e1 orelse impure e2
adamc@387 69
adamc@252 70 | ERecord xes => List.exists (fn (_, e, _) => impure e) xes
adamc@252 71 | EField (e, _) => impure e
adamc@252 72
adamc@252 73 | ECase (e, pes, _) => impure e orelse List.exists (fn (_, e) => impure e) pes
adamc@252 74
adamc@283 75 | EError (e, _) => impure e
adamc@283 76
adamc@252 77 | EStrcat (e1, e2) => impure e1 orelse impure e2
adamc@252 78
adamc@252 79 | ESeq (e1, e2) => impure e1 orelse impure e2
adamc@252 80 | ELet (_, _, e1, e2) => impure e1 orelse impure e2
adamc@252 81
adamc@252 82 | EClosure (_, es) => List.exists impure es
adamc@578 83 | EJavaScript (_, e, _) => impure e
adamc@568 84 | ESignalReturn e => impure e
adamc@572 85 | ESignalBind (e1, e2) => impure e1 orelse impure e2
adamc@574 86 | ESignalSource e => impure e
adamc@608 87 | EServerCall _ => true
adamc@252 88
adamc@252 89
adamc@252 90 val liftExpInExp = Monoize.liftExpInExp
adamc@252 91
adamc@252 92 val subExpInExp' =
adamc@133 93 U.Exp.mapB {typ = fn t => t,
adamc@133 94 exp = fn (xn, rep) => fn e =>
adamc@133 95 case e of
adamc@133 96 ERel xn' =>
adamc@133 97 (case Int.compare (xn', xn) of
adamc@133 98 EQUAL => #1 rep
adamc@133 99 | GREATER=> ERel (xn' - 1)
adamc@133 100 | LESS => e)
adamc@133 101 | _ => e,
adamc@133 102 bind = fn ((xn, rep), U.Exp.RelE _) => (xn+1, liftExpInExp 0 rep)
adamc@133 103 | (ctx, _) => ctx}
adamc@133 104
adamc@252 105 fun subExpInExp (n, e1) e2 =
adamc@252 106 let
adamc@252 107 val r = subExpInExp' (n, e1) e2
adamc@252 108 in
adamc@252 109 (*Print.prefaces "subExpInExp" [("e1", MonoPrint.p_exp MonoEnv.empty e1),
adamc@252 110 ("e2", MonoPrint.p_exp MonoEnv.empty e2),
adamc@252 111 ("r", MonoPrint.p_exp MonoEnv.empty r)];*)
adamc@252 112 r
adamc@252 113 end
adamc@133 114
adamc@133 115 fun typ c = c
adamc@133 116
adamc@316 117 val swapExpVars =
adamc@316 118 U.Exp.mapB {typ = fn t => t,
adamc@316 119 exp = fn lower => fn e =>
adamc@316 120 case e of
adamc@316 121 ERel xn =>
adamc@316 122 if xn = lower then
adamc@316 123 ERel (lower + 1)
adamc@316 124 else if xn = lower + 1 then
adamc@316 125 ERel lower
adamc@316 126 else
adamc@316 127 e
adamc@316 128 | _ => e,
adamc@316 129 bind = fn (lower, U.Exp.RelE _) => lower+1
adamc@316 130 | (lower, _) => lower}
adamc@316 131
adamc@341 132 val swapExpVarsPat =
adamc@341 133 U.Exp.mapB {typ = fn t => t,
adamc@341 134 exp = fn (lower, len) => fn e =>
adamc@341 135 case e of
adamc@341 136 ERel xn =>
adamc@341 137 if xn = lower then
adamc@341 138 ERel (lower + 1)
adamc@341 139 else if xn >= lower + 1 andalso xn < lower + 1 + len then
adamc@341 140 ERel (xn - 1)
adamc@341 141 else
adamc@341 142 e
adamc@341 143 | _ => e,
adamc@341 144 bind = fn ((lower, len), U.Exp.RelE _) => (lower+1, len)
adamc@341 145 | (st, _) => st}
adamc@341 146
adamc@258 147 datatype result = Yes of E.env | No | Maybe
adamc@258 148
adamc@183 149 fun match (env, p : pat, e : exp) =
adamc@183 150 case (#1 p, #1 e) of
adamc@258 151 (PWild, _) => Yes env
adamc@258 152 | (PVar (x, t), _) => Yes (E.pushERel env x t (SOME e))
adamc@183 153
adamc@280 154 | (PPrim (Prim.String s), EStrcat ((EPrim (Prim.String s'), _), _)) =>
adamc@280 155 if String.isPrefix s' s then
adamc@280 156 Maybe
adamc@280 157 else
adamc@280 158 No
adamc@280 159
adamc@183 160 | (PPrim p, EPrim p') =>
adamc@183 161 if Prim.equal (p, p') then
adamc@258 162 Yes env
adamc@183 163 else
adamc@258 164 No
adamc@183 165
adamc@188 166 | (PCon (_, PConVar n1, NONE), ECon (_, PConVar n2, NONE)) =>
adamc@183 167 if n1 = n2 then
adamc@258 168 Yes env
adamc@183 169 else
adamc@258 170 No
adamc@183 171
adamc@188 172 | (PCon (_, PConVar n1, SOME p), ECon (_, PConVar n2, SOME e)) =>
adamc@183 173 if n1 = n2 then
adamc@183 174 match (env, p, e)
adamc@183 175 else
adamc@258 176 No
adamc@183 177
adamc@188 178 | (PCon (_, PConFfi {mod = m1, con = con1, ...}, NONE), ECon (_, PConFfi {mod = m2, con = con2, ...}, NONE)) =>
adamc@185 179 if m1 = m2 andalso con1 = con2 then
adamc@258 180 Yes env
adamc@185 181 else
adamc@258 182 No
adamc@185 183
adamc@188 184 | (PCon (_, PConFfi {mod = m1, con = con1, ...}, SOME ep), ECon (_, PConFfi {mod = m2, con = con2, ...}, SOME e)) =>
adamc@185 185 if m1 = m2 andalso con1 = con2 then
adamc@185 186 match (env, p, e)
adamc@185 187 else
adamc@258 188 No
adamc@185 189
adamc@183 190 | (PRecord xps, ERecord xes) =>
adamc@183 191 let
adamc@183 192 fun consider (xps, env) =
adamc@183 193 case xps of
adamc@258 194 [] => Yes env
adamc@183 195 | (x, p, _) :: rest =>
adamc@183 196 case List.find (fn (x', _, _) => x' = x) xes of
adamc@258 197 NONE => No
adamc@183 198 | SOME (_, e, _) =>
adamc@183 199 case match (env, p, e) of
adamc@258 200 No => No
adamc@258 201 | Maybe => Maybe
adamc@258 202 | Yes env => consider (rest, env)
adamc@183 203 in
adamc@183 204 consider (xps, env)
adamc@183 205 end
adamc@183 206
adamc@258 207 | _ => Maybe
adamc@183 208
adamc@318 209 datatype event =
adamc@318 210 WritePage
adamc@318 211 | ReadDb
adamc@318 212 | WriteDb
adamc@481 213 | UseRel
adamc@318 214 | Unsure
adamc@318 215
adamc@318 216 fun p_event e =
adamc@318 217 let
adamc@318 218 open Print.PD
adamc@318 219 in
adamc@318 220 case e of
adamc@318 221 WritePage => string "WritePage"
adamc@318 222 | ReadDb => string "ReadDb"
adamc@318 223 | WriteDb => string "WriteDb"
adamc@481 224 | UseRel => string "UseRel"
adamc@318 225 | Unsure => string "Unsure"
adamc@318 226 end
adamc@318 227
adamc@470 228 val p_events = Print.p_list p_event
adamc@470 229
adamc@318 230 fun patBinds (p, _) =
adamc@318 231 case p of
adamc@318 232 PWild => 0
adamc@318 233 | PVar _ => 1
adamc@318 234 | PPrim _ => 0
adamc@318 235 | PCon (_, _, NONE) => 0
adamc@318 236 | PCon (_, _, SOME p) => patBinds p
adamc@318 237 | PRecord xpts => foldl (fn ((_, p, _), n) => n + patBinds p) 0 xpts
adamc@318 238 | PNone _ => 0
adamc@318 239 | PSome (_, p) => patBinds p
adamc@318 240
adamc@470 241 fun reduce file =
adamc@470 242 let
adamc@470 243 fun countAbs (e, _) =
adamc@470 244 case e of
adamc@470 245 EAbs (_, _, _, e) => 1 + countAbs e
adamc@470 246 | _ => 0
adamc@318 247
adamc@470 248 val absCounts =
adamc@470 249 foldl (fn ((d, _), absCounts) =>
adamc@470 250 case d of
adamc@470 251 DVal (_, n, _, e, _) =>
adamc@470 252 IM.insert (absCounts, n, countAbs e)
adamc@470 253 | DValRec vis =>
adamc@470 254 foldl (fn ((_, n, _, e, _), absCounts) =>
adamc@470 255 IM.insert (absCounts, n, countAbs e))
adamc@470 256 absCounts vis
adamc@470 257 | _ => absCounts)
adamc@470 258 IM.empty file
adamc@387 259
adamc@470 260 fun summarize d (e, _) =
adamc@579 261 let
adamc@668 262 fun ffi es = List.concat (map (summarize d) es) @ [Unsure]
adamc@668 263
adamc@579 264 val s =
adamc@579 265 case e of
adamc@579 266 EPrim _ => []
adamc@579 267 | ERel n => if n = d then [UseRel] else []
adamc@579 268 | ENamed _ => []
adamc@579 269 | ECon (_, _, NONE) => []
adamc@579 270 | ECon (_, _, SOME e) => summarize d e
adamc@579 271 | ENone _ => []
adamc@579 272 | ESome (_, e) => summarize d e
adamc@579 273 | EFfi _ => []
adamc@668 274 | EFfiApp ("Basis", "set_cookie", es) => ffi es
adamc@668 275 | EFfiApp ("Basis", "new_client_source", es) => ffi es
adamc@668 276 | EFfiApp ("Basis", "set_client_source", es) => ffi es
adamc@668 277 | EFfiApp ("Basis", "alert", es) => ffi es
adamc@668 278 | EFfiApp ("Basis", "new_channel", es) => ffi es
adamc@668 279 | EFfiApp ("Basis", "subscribe", es) => ffi es
adamc@668 280 | EFfiApp ("Basis", "send", es) => ffi es
adamc@579 281 | EFfiApp (_, _, es) => List.concat (map (summarize d) es)
adamc@579 282 | EApp ((EFfi _, _), e) => summarize d e
adamc@579 283 | EApp _ =>
adamc@579 284 let
adamc@579 285 fun unravel (e, ls) =
adamc@579 286 case e of
adamc@579 287 ENamed n =>
adamc@579 288 let
adamc@579 289 val ls = rev ls
adamc@579 290 in
adamc@579 291 case IM.find (absCounts, n) of
adamc@579 292 NONE => [Unsure]
adamc@579 293 | SOME len =>
adamc@579 294 if length ls < len then
adamc@579 295 ls
adamc@579 296 else
adamc@579 297 [Unsure]
adamc@579 298 end
adamc@579 299 | ERel n => List.revAppend (ls,
adamc@579 300 if n = d then
adamc@579 301 [UseRel, Unsure]
adamc@579 302 else
adamc@579 303 [Unsure])
adamc@579 304 | EApp (f, x) =>
adamc@579 305 unravel (#1 f, summarize d x @ ls)
adamc@579 306 | _ => [Unsure]
adamc@579 307 in
adamc@579 308 unravel (e, [])
adamc@579 309 end
adamc@252 310
adamc@579 311 | EAbs (_, _, _, e) => List.filter (fn UseRel => true
adamc@579 312 | _ => false) (summarize (d + 1) e)
adamc@316 313
adamc@579 314 | EUnop (_, e) => summarize d e
adamc@579 315 | EBinop (_, e1, e2) => summarize d e1 @ summarize d e2
adamc@470 316
adamc@579 317 | ERecord xets => List.concat (map (summarize d o #2) xets)
adamc@579 318 | EField (e, _) => summarize d e
adamc@470 319
adamc@579 320 | ECase (e, pes, _) =>
adamc@579 321 let
adamc@579 322 val lss = map (fn (p, e) => summarize (d + patBinds p) e) pes
adamc@579 323 in
adamc@579 324 case lss of
adamc@579 325 [] => raise Fail "Empty pattern match"
adamc@579 326 | ls :: lss =>
adamc@579 327 if List.all (fn ls' => ls' = ls) lss then
adamc@579 328 summarize d e @ ls
adamc@579 329 else
adamc@579 330 [Unsure]
adamc@579 331 end
adamc@579 332 | EStrcat (e1, e2) => summarize d e1 @ summarize d e2
adamc@316 333
adamc@579 334 | EError (e, _) => summarize d e @ [Unsure]
adamc@318 335
adamc@579 336 | EWrite e => summarize d e @ [WritePage]
adamc@579 337
adamc@579 338 | ESeq (e1, e2) => summarize d e1 @ summarize d e2
adamc@579 339 | ELet (_, _, e1, e2) => summarize d e1 @ summarize (d + 1) e2
adamc@456 340
adamc@579 341 | EClosure (_, es) => List.concat (map (summarize d) es)
adamc@470 342
adamc@579 343 | EQuery {query, body, initial, ...} =>
adamc@579 344 List.concat [summarize d query,
adamc@579 345 summarize (d + 2) body,
adamc@579 346 summarize d initial,
adamc@579 347 [ReadDb]]
adamc@470 348
adamc@579 349 | EDml e => summarize d e @ [WriteDb]
adamc@579 350 | ENextval e => summarize d e @ [WriteDb]
adamc@579 351 | EUnurlify (e, _) => summarize d e
adamc@579 352 | EJavaScript (_, e, _) => summarize d e
adamc@579 353 | ESignalReturn e => summarize d e
adamc@579 354 | ESignalBind (e1, e2) => summarize d e1 @ summarize d e2
adamc@579 355 | ESignalSource e => summarize d e
adamc@608 356
adamc@614 357 | EServerCall (e, ek, _) => summarize d e @ summarize d ek @ [Unsure]
adamc@579 358 in
adamc@579 359 (*Print.prefaces "Summarize"
adamc@579 360 [("e", MonoPrint.p_exp MonoEnv.empty (e, ErrorMsg.dummySpan)),
adamc@579 361 ("d", Print.PD.string (Int.toString d)),
adamc@579 362 ("s", p_events s)];*)
adamc@579 363 s
adamc@579 364 end
adamc@470 365
adamc@470 366 fun exp env e =
adamc@470 367 let
adamc@470 368 (*val () = Print.prefaces "exp" [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan))]*)
adamc@470 369
adamc@470 370 val r =
adamc@470 371 case e of
adamc@470 372 ERel n =>
adamc@470 373 (case E.lookupERel env n of
adamc@470 374 (_, _, SOME e') => #1 e'
adamc@470 375 | _ => e)
adamc@470 376 | ENamed n =>
adamc@470 377 (case E.lookupENamed env n of
adamc@470 378 (_, _, SOME e', _) => ((*Print.prefaces "Switch" [("n", Print.PD.string (Int.toString n)),
adamc@470 379 ("e'", MonoPrint.p_exp env e')];*)
adamc@470 380 #1 e')
adamc@470 381 | _ => e)
adamc@470 382
adamc@470 383 | EApp ((EAbs (x, t, _, e1), loc), e2) =>
adamc@470 384 ((*Print.prefaces "Considering" [("e1", MonoPrint.p_exp (E.pushERel env x t NONE) e1),
adamc@470 385 ("e2", MonoPrint.p_exp env e2),
adamc@470 386 ("sub", MonoPrint.p_exp env (reduceExp env (subExpInExp (0, e2) e1)))];*)
adamc@470 387 if impure e2 then
adamc@470 388 #1 (reduceExp env (ELet (x, t, e2, e1), loc))
adamc@470 389 else
adamc@470 390 #1 (reduceExp env (subExpInExp (0, e2) e1)))
adamc@470 391
adamc@470 392 | ECase (e', pes, {disc, result}) =>
adamc@442 393 let
adamc@470 394 fun push () =
adamc@470 395 case result of
adamc@470 396 (TFun (dom, result), loc) =>
adamc@470 397 if List.all (fn (_, (EAbs _, _)) => true | _ => false) pes then
adamc@470 398 EAbs ("_", dom, result,
adamc@470 399 (ECase (liftExpInExp 0 e',
adamc@470 400 map (fn (p, (EAbs (_, _, _, e), _)) =>
adamc@470 401 (p, swapExpVarsPat (0, patBinds p) e)
adamc@470 402 | _ => raise Fail "MonoReduce ECase") pes,
adamc@470 403 {disc = disc, result = result}), loc))
adamc@470 404 else
adamc@470 405 e
adamc@470 406 | _ => e
adamc@318 407
adamc@470 408 fun search pes =
adamc@470 409 case pes of
adamc@470 410 [] => push ()
adamc@470 411 | (p, body) :: pes =>
adamc@470 412 case match (env, p, e') of
adamc@470 413 No => search pes
adamc@470 414 | Maybe => push ()
adamc@470 415 | Yes env => #1 (reduceExp env body)
adamc@470 416 in
adamc@470 417 search pes
adamc@470 418 end
adamc@318 419
adamc@470 420 | EField ((ERecord xes, _), x) =>
adamc@470 421 (case List.find (fn (x', _, _) => x' = x) xes of
adamc@470 422 SOME (_, e, _) => #1 e
adamc@470 423 | NONE => e)
adamc@398 424
adamc@470 425 | ELet (x1, t1, (ELet (x2, t2, e1, b1), loc), b2) =>
adamc@470 426 let
adamc@470 427 val e' = (ELet (x2, t2, e1,
adamc@470 428 (ELet (x1, t1, b1,
adamc@470 429 liftExpInExp 1 b2), loc)), loc)
adamc@442 430 in
adamc@470 431 (*Print.prefaces "ELet commute" [("e", MonoPrint.p_exp env (e, loc)),
adamc@470 432 ("e'", MonoPrint.p_exp env e')];*)
adamc@470 433 #1 (reduceExp env e')
adamc@470 434 end
adamc@470 435 | EApp ((ELet (x, t, e, b), loc), e') =>
adamc@470 436 #1 (reduceExp env (ELet (x, t, e,
adamc@470 437 (EApp (b, liftExpInExp 0 e'), loc)), loc))
adamc@470 438
adamc@470 439 | ELet (x, t, e', (EAbs (x', t' as (TRecord [], _), ran, e''), loc)) =>
adamc@470 440 (*if impure e' then
adamc@470 441 e
adamc@470 442 else*)
adamc@470 443 (* Seems unsound in general without the check... should revisit later *)
adamc@470 444 EAbs (x', t', ran, (ELet (x, t, liftExpInExp 0 e', swapExpVars 0 e''), loc))
adamc@470 445
adamc@470 446 | ELet (x, t, e', b) =>
adamc@470 447 let
adamc@470 448 fun doSub () =
adamc@470 449 #1 (reduceExp env (subExpInExp (0, e') b))
adamc@470 450
adamc@470 451 fun trySub () =
adamc@470 452 case t of
adamc@470 453 (TFfi ("Basis", "string"), _) => doSub ()
adamc@568 454 | (TSignal _, _) => e
adamc@470 455 | _ =>
adamc@470 456 case e' of
adamc@470 457 (ECase _, _) => e
adamc@470 458 | _ => doSub ()
adamc@470 459 in
adamc@470 460 if impure e' then
adamc@470 461 let
adamc@470 462 val effs_e' = summarize 0 e'
adamc@489 463 val effs_e' = List.filter (fn x => x <> UseRel) effs_e'
adamc@470 464 val effs_b = summarize 0 b
adamc@470 465
adamc@470 466 (*val () = Print.prefaces "Try"
adamc@489 467 [("e", MonoPrint.p_exp env (e, ErrorMsg.dummySpan)),
adamc@489 468 ("e'", p_events effs_e'),
adamc@489 469 ("b", p_events effs_b)]*)
adamc@470 470
adamc@470 471 fun does eff = List.exists (fn eff' => eff' = eff) effs_e'
adamc@470 472 val writesPage = does WritePage
adamc@470 473 val readsDb = does ReadDb
adamc@470 474 val writesDb = does WriteDb
adamc@470 475
adamc@470 476 fun verifyUnused eff =
adamc@470 477 case eff of
adamc@481 478 UseRel => false
adamc@470 479 | _ => true
adamc@470 480
adamc@470 481 fun verifyCompatible effs =
adamc@470 482 case effs of
adamc@470 483 [] => false
adamc@470 484 | eff :: effs =>
adamc@470 485 case eff of
adamc@470 486 Unsure => false
adamc@481 487 | UseRel => List.all verifyUnused effs
adamc@470 488 | WritePage => not writesPage andalso verifyCompatible effs
adamc@470 489 | ReadDb => not writesDb andalso verifyCompatible effs
adamc@470 490 | WriteDb => not writesDb andalso not readsDb andalso verifyCompatible effs
adamc@470 491 in
adamc@470 492 (*Print.prefaces "verifyCompatible"
adamc@601 493 [("e'", MonoPrint.p_exp env e'),
adamc@601 494 ("b", MonoPrint.p_exp (E.pushERel env x t NONE) b),
adamc@601 495 ("effs_e'", Print.p_list p_event effs_e'),
adamc@601 496 ("effs_b", Print.p_list p_event effs_b)];*)
adamc@601 497 if List.null effs_e' orelse (List.all (fn eff => eff <> Unsure) effs_e'
adamc@601 498 andalso verifyCompatible effs_b) then
adamc@470 499 trySub ()
adamc@470 500 else
adamc@470 501 e
adamc@470 502 end
adamc@470 503 else
adamc@442 504 trySub ()
adamc@442 505 end
adamc@252 506
adamc@470 507 | EStrcat ((EPrim (Prim.String s1), _), (EPrim (Prim.String s2), _)) =>
adamc@470 508 EPrim (Prim.String (s1 ^ s2))
adamc@268 509
adamc@572 510 | ESignalBind ((ESignalReturn e1, loc), e2) =>
adamc@572 511 #1 (reduceExp env (EApp (e2, e1), loc))
adamc@572 512
adamc@470 513 | _ => e
adamc@470 514 in
adamc@470 515 (*Print.prefaces "exp'" [("r", MonoPrint.p_exp env (r, ErrorMsg.dummySpan))];*)
adamc@470 516 r
adamc@470 517 end
adamc@470 518
adamc@470 519 and bind (env, b) =
adamc@470 520 case b of
adamc@470 521 U.Decl.Datatype (x, n, xncs) => E.pushDatatype env x n xncs
adamc@470 522 | U.Decl.RelE (x, t) => E.pushERel env x t NONE
adamc@470 523 | U.Decl.NamedE (x, n, t, eo, s) => E.pushENamed env x n t (Option.map (reduceExp env) eo) s
adamc@470 524
adamc@470 525 and reduceExp env = U.Exp.mapB {typ = typ, exp = exp, bind = bind} env
adamc@470 526
adamc@470 527 fun decl env d = d
adamc@398 528 in
adamc@470 529 U.File.mapB {typ = typ, exp = exp, decl = decl, bind = bind} E.empty file
adamc@398 530 end
adamc@133 531
adamc@133 532 end