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annotate src/iflow.sml @ 1218:48d2ca496d2c

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Path conditions, used to track implicit flows
author Adam Chlipala <adamc@hcoop.net>
date Sat, 10 Apr 2010 13:02:15 -0400
parents 4d206e603300
children 3224faec752d
rev   line source
adamc@1200 1 (* Copyright (c) 2010, Adam Chlipala
adamc@1200 2 * All rights reserved.
adamc@1200 3 *
adamc@1200 4 * Redistribution and use in source and binary forms, with or without
adamc@1200 5 * modification, are permitted provided that the following conditions are met:
adamc@1200 6 *
adamc@1200 7 * - Redistributions of source code must retain the above copyright notice,
adamc@1200 8 * this list of conditions and the following disclaimer.
adamc@1200 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@1200 10 * this list of conditions and the following disclaimer in the documentation
adamc@1200 11 * and/or other materials provided with the distribution.
adamc@1200 12 * - The names of contributors may not be used to endorse or promote products
adamc@1200 13 * derived from this software without specific prior written permission.
adamc@1200 14 *
adamc@1200 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@1200 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@1200 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@1200 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@1200 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@1200 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@1200 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@1200 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@1200 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@1200 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@1200 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@1200 26 *)
adamc@1200 27
adamc@1200 28 structure Iflow :> IFLOW = struct
adamc@1200 29
adamc@1200 30 open Mono
adamc@1200 31
adamc@1207 32 structure IS = IntBinarySet
adamc@1202 33 structure IM = IntBinaryMap
adamc@1202 34
adamc@1215 35 structure SK = struct
adamc@1215 36 type ord_key = string
adamc@1215 37 val compare = String.compare
adamc@1215 38 end
adamc@1215 39
adamc@1215 40 structure SS = BinarySetFn(SK)
adamc@1215 41 structure SM = BinaryMapFn(SK)
adamc@1200 42
adamc@1200 43 val writers = ["htmlifyInt_w",
adamc@1200 44 "htmlifyFloat_w",
adamc@1200 45 "htmlifyString_w",
adamc@1200 46 "htmlifyBool_w",
adamc@1200 47 "htmlifyTime_w",
adamc@1200 48 "attrifyInt_w",
adamc@1200 49 "attrifyFloat_w",
adamc@1200 50 "attrifyString_w",
adamc@1200 51 "attrifyChar_w",
adamc@1200 52 "urlifyInt_w",
adamc@1200 53 "urlifyFloat_w",
adamc@1200 54 "urlifyString_w",
adamc@1213 55 "urlifyBool_w",
adamc@1213 56 "set_cookie"]
adamc@1200 57
adamc@1200 58 val writers = SS.addList (SS.empty, writers)
adamc@1200 59
adamc@1200 60 type lvar = int
adamc@1200 61
adamc@1215 62 datatype func =
adamc@1215 63 DtCon0 of string
adamc@1215 64 | DtCon1 of string
adamc@1215 65 | UnCon of string
adamc@1215 66 | Other of string
adamc@1215 67
adamc@1200 68 datatype exp =
adamc@1200 69 Const of Prim.t
adamc@1200 70 | Var of int
adamc@1200 71 | Lvar of lvar
adamc@1215 72 | Func of func * exp list
adamc@1200 73 | Recd of (string * exp) list
adamc@1200 74 | Proj of exp * string
adamc@1200 75 | Finish
adamc@1200 76
adamc@1200 77 datatype reln =
adamc@1207 78 Known
adamc@1207 79 | Sql of string
adamc@1215 80 | PCon0 of string
adamc@1215 81 | PCon1 of string
adamc@1200 82 | Eq
adamc@1210 83 | Ne
adamc@1210 84 | Lt
adamc@1210 85 | Le
adamc@1210 86 | Gt
adamc@1210 87 | Ge
adamc@1200 88
adamc@1200 89 datatype prop =
adamc@1200 90 True
adamc@1200 91 | False
adamc@1200 92 | Unknown
adamc@1200 93 | And of prop * prop
adamc@1200 94 | Or of prop * prop
adamc@1200 95 | Reln of reln * exp list
adamc@1212 96 | Cond of exp * prop
adamc@1200 97
adamc@1215 98 val unif = ref (IM.empty : exp IM.map)
adamc@1215 99
adamc@1215 100 fun reset () = unif := IM.empty
adamc@1215 101 fun save () = !unif
adamc@1215 102 fun restore x = unif := x
adamc@1215 103
adamc@1200 104 local
adamc@1207 105 open Print
adamc@1207 106 val string = PD.string
adamc@1207 107 in
adamc@1207 108
adamc@1215 109 fun p_func f =
adamc@1215 110 string (case f of
adamc@1215 111 DtCon0 s => s
adamc@1215 112 | DtCon1 s => s
adamc@1215 113 | UnCon s => "un" ^ s
adamc@1215 114 | Other s => s)
adamc@1215 115
adamc@1207 116 fun p_exp e =
adamc@1207 117 case e of
adamc@1207 118 Const p => Prim.p_t p
adamc@1207 119 | Var n => string ("x" ^ Int.toString n)
adamc@1215 120 | Lvar n =>
adamc@1215 121 (case IM.find (!unif, n) of
adamc@1215 122 NONE => string ("X" ^ Int.toString n)
adamc@1215 123 | SOME e => p_exp e)
adamc@1215 124 | Func (f, es) => box [p_func f,
adamc@1215 125 string "(",
adamc@1207 126 p_list p_exp es,
adamc@1207 127 string ")"]
adamc@1207 128 | Recd xes => box [string "{",
adamc@1210 129 p_list (fn (x, e) => box [string x,
adamc@1207 130 space,
adamc@1207 131 string "=",
adamc@1207 132 space,
adamc@1207 133 p_exp e]) xes,
adamc@1207 134 string "}"]
adamc@1207 135 | Proj (e, x) => box [p_exp e,
adamc@1207 136 string ("." ^ x)]
adamc@1207 137 | Finish => string "FINISH"
adamc@1207 138
adamc@1210 139 fun p_bop s es =
adamc@1210 140 case es of
adamc@1210 141 [e1, e2] => box [p_exp e1,
adamc@1210 142 space,
adamc@1210 143 string s,
adamc@1210 144 space,
adamc@1210 145 p_exp e2]
adamc@1210 146 | _ => raise Fail "Iflow.p_bop"
adamc@1210 147
adamc@1207 148 fun p_reln r es =
adamc@1207 149 case r of
adamc@1207 150 Known =>
adamc@1207 151 (case es of
adamc@1207 152 [e] => box [string "known(",
adamc@1207 153 p_exp e,
adamc@1207 154 string ")"]
adamc@1207 155 | _ => raise Fail "Iflow.p_reln: Known")
adamc@1207 156 | Sql s => box [string (s ^ "("),
adamc@1207 157 p_list p_exp es,
adamc@1207 158 string ")"]
adamc@1215 159 | PCon0 s => box [string (s ^ "("),
adamc@1215 160 p_list p_exp es,
adamc@1215 161 string ")"]
adamc@1215 162 | PCon1 s => box [string (s ^ "("),
adamc@1211 163 p_list p_exp es,
adamc@1211 164 string ")"]
adamc@1210 165 | Eq => p_bop "=" es
adamc@1210 166 | Ne => p_bop "<>" es
adamc@1210 167 | Lt => p_bop "<" es
adamc@1210 168 | Le => p_bop "<=" es
adamc@1210 169 | Gt => p_bop ">" es
adamc@1210 170 | Ge => p_bop ">=" es
adamc@1207 171
adamc@1207 172 fun p_prop p =
adamc@1207 173 case p of
adamc@1207 174 True => string "True"
adamc@1207 175 | False => string "False"
adamc@1207 176 | Unknown => string "??"
adamc@1207 177 | And (p1, p2) => box [string "(",
adamc@1207 178 p_prop p1,
adamc@1207 179 string ")",
adamc@1207 180 space,
adamc@1207 181 string "&&",
adamc@1207 182 space,
adamc@1207 183 string "(",
adamc@1207 184 p_prop p2,
adamc@1207 185 string ")"]
adamc@1207 186 | Or (p1, p2) => box [string "(",
adamc@1207 187 p_prop p1,
adamc@1207 188 string ")",
adamc@1207 189 space,
adamc@1207 190 string "||",
adamc@1207 191 space,
adamc@1207 192 string "(",
adamc@1207 193 p_prop p2,
adamc@1207 194 string ")"]
adamc@1207 195 | Reln (r, es) => p_reln r es
adamc@1212 196 | Cond (e, p) => box [string "(",
adamc@1212 197 p_exp e,
adamc@1212 198 space,
adamc@1212 199 string "==",
adamc@1212 200 space,
adamc@1212 201 p_prop p,
adamc@1212 202 string ")"]
adamc@1207 203
adamc@1207 204 end
adamc@1207 205
adamc@1207 206 local
adamc@1202 207 val count = ref 1
adamc@1200 208 in
adamc@1200 209 fun newLvar () =
adamc@1200 210 let
adamc@1200 211 val n = !count
adamc@1200 212 in
adamc@1200 213 count := n + 1;
adamc@1200 214 n
adamc@1200 215 end
adamc@1200 216 end
adamc@1200 217
adamc@1200 218 fun isKnown e =
adamc@1200 219 case e of
adamc@1200 220 Const _ => true
adamc@1200 221 | Func (_, es) => List.all isKnown es
adamc@1200 222 | Recd xes => List.all (isKnown o #2) xes
adamc@1200 223 | Proj (e, _) => isKnown e
adamc@1200 224 | _ => false
adamc@1200 225
adamc@1200 226 fun isFinish e =
adamc@1200 227 case e of
adamc@1200 228 Finish => true
adamc@1200 229 | _ => false
adamc@1200 230
adamc@1200 231 fun simplify e =
adamc@1200 232 case e of
adamc@1200 233 Const _ => e
adamc@1200 234 | Var _ => e
adamc@1208 235 | Lvar n =>
adamc@1208 236 (case IM.find (!unif, n) of
adamc@1208 237 NONE => e
adamc@1208 238 | SOME e => simplify e)
adamc@1215 239 | Func (f, es) => Func (f, map simplify es)
adamc@1215 240 | Recd xes => Recd (map (fn (x, e) => (x, simplify e)) xes)
adamc@1215 241 | Proj (e, s) => Proj (simplify e, s)
adamc@1200 242 | Finish => Finish
adamc@1200 243
adamc@1212 244 datatype atom =
adamc@1212 245 AReln of reln * exp list
adamc@1212 246 | ACond of exp * prop
adamc@1212 247
adamc@1212 248 fun p_atom a =
adamc@1212 249 p_prop (case a of
adamc@1212 250 AReln x => Reln x
adamc@1212 251 | ACond x => Cond x)
adamc@1212 252
adamc@1202 253 fun lvarIn lv =
adamc@1202 254 let
adamc@1202 255 fun lvi e =
adamc@1202 256 case e of
adamc@1202 257 Const _ => false
adamc@1202 258 | Var _ => false
adamc@1202 259 | Lvar lv' => lv' = lv
adamc@1202 260 | Func (_, es) => List.exists lvi es
adamc@1202 261 | Recd xes => List.exists (lvi o #2) xes
adamc@1202 262 | Proj (e, _) => lvi e
adamc@1202 263 | Finish => false
adamc@1202 264 in
adamc@1202 265 lvi
adamc@1202 266 end
adamc@1202 267
adamc@1212 268 fun lvarInP lv =
adamc@1212 269 let
adamc@1212 270 fun lvi p =
adamc@1212 271 case p of
adamc@1212 272 True => false
adamc@1212 273 | False => false
adamc@1212 274 | Unknown => true
adamc@1212 275 | And (p1, p2) => lvi p1 orelse lvi p2
adamc@1212 276 | Or (p1, p2) => lvi p1 orelse lvi p2
adamc@1212 277 | Reln (_, es) => List.exists (lvarIn lv) es
adamc@1212 278 | Cond (e, p) => lvarIn lv e orelse lvi p
adamc@1212 279 in
adamc@1212 280 lvi
adamc@1212 281 end
adamc@1212 282
adamc@1212 283 fun varIn lv =
adamc@1212 284 let
adamc@1212 285 fun lvi e =
adamc@1212 286 case e of
adamc@1212 287 Const _ => false
adamc@1212 288 | Lvar _ => false
adamc@1212 289 | Var lv' => lv' = lv
adamc@1212 290 | Func (_, es) => List.exists lvi es
adamc@1212 291 | Recd xes => List.exists (lvi o #2) xes
adamc@1212 292 | Proj (e, _) => lvi e
adamc@1212 293 | Finish => false
adamc@1212 294 in
adamc@1212 295 lvi
adamc@1212 296 end
adamc@1212 297
adamc@1212 298 fun varInP lv =
adamc@1212 299 let
adamc@1212 300 fun lvi p =
adamc@1212 301 case p of
adamc@1212 302 True => false
adamc@1212 303 | False => false
adamc@1212 304 | Unknown => false
adamc@1212 305 | And (p1, p2) => lvi p1 orelse lvi p2
adamc@1212 306 | Or (p1, p2) => lvi p1 orelse lvi p2
adamc@1212 307 | Reln (_, es) => List.exists (varIn lv) es
adamc@1212 308 | Cond (e, p) => varIn lv e orelse lvi p
adamc@1212 309 in
adamc@1212 310 lvi
adamc@1212 311 end
adamc@1212 312
adamc@1202 313 fun eq' (e1, e2) =
adamc@1202 314 case (e1, e2) of
adamc@1202 315 (Const p1, Const p2) => Prim.equal (p1, p2)
adamc@1202 316 | (Var n1, Var n2) => n1 = n2
adamc@1202 317
adamc@1202 318 | (Lvar n1, _) =>
adamc@1202 319 (case IM.find (!unif, n1) of
adamc@1202 320 SOME e1 => eq' (e1, e2)
adamc@1202 321 | NONE =>
adamc@1202 322 case e2 of
adamc@1202 323 Lvar n2 =>
adamc@1202 324 (case IM.find (!unif, n2) of
adamc@1202 325 SOME e2 => eq' (e1, e2)
adamc@1202 326 | NONE => n1 = n2
adamc@1208 327 orelse (unif := IM.insert (!unif, n2, e1);
adamc@1202 328 true))
adamc@1202 329 | _ =>
adamc@1202 330 if lvarIn n1 e2 then
adamc@1202 331 false
adamc@1202 332 else
adamc@1202 333 (unif := IM.insert (!unif, n1, e2);
adamc@1202 334 true))
adamc@1202 335
adamc@1202 336 | (_, Lvar n2) =>
adamc@1202 337 (case IM.find (!unif, n2) of
adamc@1202 338 SOME e2 => eq' (e1, e2)
adamc@1202 339 | NONE =>
adamc@1202 340 if lvarIn n2 e1 then
adamc@1202 341 false
adamc@1202 342 else
adamc@1213 343 ((*Print.prefaces "unif" [("n2", Print.PD.string (Int.toString n2)),
adamc@1213 344 ("e1", p_exp e1)];*)
adamc@1213 345 unif := IM.insert (!unif, n2, e1);
adamc@1202 346 true))
adamc@1202 347
adamc@1202 348 | (Func (f1, es1), Func (f2, es2)) => f1 = f2 andalso ListPair.allEq eq' (es1, es2)
adamc@1202 349 | (Recd xes1, Recd xes2) => ListPair.allEq (fn ((x1, e1), (x2, e2)) => x1 = x2 andalso eq' (e1, e2)) (xes1, xes2)
adamc@1202 350 | (Proj (e1, s1), Proj (e2, s2)) => eq' (e1, e2) andalso s1 = s2
adamc@1202 351 | (Finish, Finish) => true
adamc@1202 352 | _ => false
adamc@1202 353
adamc@1202 354 fun eq (e1, e2) =
adamc@1202 355 let
adamc@1203 356 val saved = save ()
adamc@1202 357 in
adamc@1202 358 if eq' (simplify e1, simplify e2) then
adamc@1202 359 true
adamc@1202 360 else
adamc@1203 361 (restore saved;
adamc@1202 362 false)
adamc@1202 363 end
adamc@1202 364
adamc@1208 365 val debug = ref false
adamc@1208 366
adamc@1211 367 fun eeq (e1, e2) =
adamc@1211 368 case (e1, e2) of
adamc@1211 369 (Const p1, Const p2) => Prim.equal (p1, p2)
adamc@1211 370 | (Var n1, Var n2) => n1 = n2
adamc@1211 371 | (Lvar n1, Lvar n2) => n1 = n2
adamc@1211 372 | (Func (f1, es1), Func (f2, es2)) => f1 = f2 andalso ListPair.allEq eeq (es1, es2)
adamc@1211 373 | (Recd xes1, Recd xes2) => length xes1 = length xes2 andalso
adamc@1211 374 List.all (fn (x2, e2) =>
adamc@1211 375 List.exists (fn (x1, e1) => x1 = x2 andalso eeq (e1, e2)) xes2) xes1
adamc@1211 376 | (Proj (e1, x1), Proj (e2, x2)) => eeq (e1, e2) andalso x1 = x2
adamc@1211 377 | (Finish, Finish) => true
adamc@1211 378 | _ => false
adamc@1211 379
adamc@1208 380 (* Congruence closure *)
adamc@1208 381 structure Cc :> sig
adamc@1215 382 type database
adamc@1215 383
adamc@1215 384 exception Contradiction
adamc@1215 385 exception Undetermined
adamc@1215 386
adamc@1215 387 val database : unit -> database
adamc@1215 388
adamc@1215 389 val assert : database * atom -> unit
adamc@1215 390 val check : database * atom -> bool
adamc@1215 391
adamc@1215 392 val p_database : database Print.printer
adamc@1218 393
adamc@1218 394 val builtFrom : database * {Base : exp list, Derived : exp} -> bool
adamc@1208 395 end = struct
adamc@1208 396
adamc@1215 397 exception Contradiction
adamc@1215 398 exception Undetermined
adamc@1208 399
adamc@1215 400 structure CM = BinaryMapFn(struct
adamc@1215 401 type ord_key = Prim.t
adamc@1215 402 val compare = Prim.compare
adamc@1215 403 end)
adamc@1208 404
adamc@1215 405 datatype node = Node of {Rep : node ref option ref,
adamc@1215 406 Cons : node ref SM.map ref,
adamc@1215 407 Variety : variety,
adamc@1215 408 Known : bool ref}
adamc@1208 409
adamc@1215 410 and variety =
adamc@1215 411 Dt0 of string
adamc@1215 412 | Dt1 of string * node ref
adamc@1215 413 | Prim of Prim.t
adamc@1215 414 | Recrd of node ref SM.map ref
adamc@1215 415 | VFinish
adamc@1215 416 | Nothing
adamc@1208 417
adamc@1215 418 type representative = node ref
adamc@1215 419
adamc@1215 420 val finish = ref (Node {Rep = ref NONE,
adamc@1215 421 Cons = ref SM.empty,
adamc@1215 422 Variety = VFinish,
adamc@1218 423 Known = ref true})
adamc@1215 424
adamc@1215 425 type database = {Vars : representative IM.map ref,
adamc@1215 426 Consts : representative CM.map ref,
adamc@1215 427 Con0s : representative SM.map ref,
adamc@1215 428 Records : (representative SM.map * representative) list ref,
adamc@1215 429 Funcs : ((string * representative list) * representative) list ref }
adamc@1215 430
adamc@1215 431 fun database () = {Vars = ref IM.empty,
adamc@1215 432 Consts = ref CM.empty,
adamc@1215 433 Con0s = ref SM.empty,
adamc@1215 434 Records = ref [],
adamc@1215 435 Funcs = ref []}
adamc@1215 436
adamc@1215 437 fun unNode n =
adamc@1215 438 case !n of
adamc@1215 439 Node r => r
adamc@1215 440
adamc@1215 441 open Print
adamc@1215 442 val string = PD.string
adamc@1215 443 val newline = PD.newline
adamc@1215 444
adamc@1215 445 fun p_rep n =
adamc@1215 446 case !(#Rep (unNode n)) of
adamc@1215 447 SOME n => p_rep n
adamc@1215 448 | NONE =>
adamc@1215 449 case #Variety (unNode n) of
adamc@1215 450 Nothing => string ("?" ^ Int.toString (Unsafe.cast n))
adamc@1215 451 | Dt0 s => string ("Dt0(" ^ s ^ ")")
adamc@1215 452 | Dt1 (s, n) => box[string ("Dt1(" ^ s ^ ","),
adamc@1215 453 space,
adamc@1215 454 p_rep n,
adamc@1215 455 string ")"]
adamc@1215 456 | Prim p => Prim.p_t p
adamc@1215 457 | Recrd (ref m) => box [string "{",
adamc@1215 458 p_list (fn (x, n) => box [string x,
adamc@1215 459 space,
adamc@1215 460 string "=",
adamc@1215 461 space,
adamc@1215 462 p_rep n]) (SM.listItemsi m),
adamc@1215 463 string "}"]
adamc@1215 464 | VFinish => string "FINISH"
adamc@1215 465
adamc@1215 466 fun p_database (db : database) =
adamc@1215 467 box [string "Vars:",
adamc@1215 468 newline,
adamc@1215 469 p_list_sep newline (fn (i, n) => box [string ("x" ^ Int.toString i),
adamc@1215 470 space,
adamc@1215 471 string "=",
adamc@1215 472 space,
adamc@1218 473 p_rep n,
adamc@1218 474 if !(#Known (unNode n)) then
adamc@1218 475 box [space,
adamc@1218 476 string "(known)"]
adamc@1218 477 else
adamc@1218 478 box []]) (IM.listItemsi (!(#Vars db)))]
adamc@1215 479
adamc@1215 480 fun repOf (n : representative) : representative =
adamc@1215 481 case !(#Rep (unNode n)) of
adamc@1215 482 NONE => n
adamc@1215 483 | SOME r =>
adamc@1215 484 let
adamc@1215 485 val r = repOf r
adamc@1215 486 in
adamc@1215 487 #Rep (unNode n) := SOME r;
adamc@1215 488 r
adamc@1215 489 end
adamc@1215 490
adamc@1215 491 fun markKnown r =
adamc@1218 492 if !(#Known (unNode r)) then
adamc@1218 493 ()
adamc@1218 494 else
adamc@1218 495 (#Known (unNode r) := true;
adamc@1218 496 SM.app markKnown (!(#Cons (unNode r)));
adamc@1218 497 case #Variety (unNode r) of
adamc@1218 498 Dt1 (_, r) => markKnown r
adamc@1218 499 | Recrd xes => SM.app markKnown (!xes)
adamc@1218 500 | _ => ())
adamc@1215 501
adamc@1215 502 fun representative (db : database, e) =
adamc@1208 503 let
adamc@1215 504 fun rep e =
adamc@1215 505 case e of
adamc@1215 506 Const p => (case CM.find (!(#Consts db), p) of
adamc@1215 507 SOME r => repOf r
adamc@1215 508 | NONE =>
adamc@1215 509 let
adamc@1215 510 val r = ref (Node {Rep = ref NONE,
adamc@1215 511 Cons = ref SM.empty,
adamc@1215 512 Variety = Prim p,
adamc@1215 513 Known = ref false})
adamc@1215 514 in
adamc@1215 515 #Consts db := CM.insert (!(#Consts db), p, r);
adamc@1215 516 r
adamc@1215 517 end)
adamc@1215 518 | Var n => (case IM.find (!(#Vars db), n) of
adamc@1215 519 SOME r => repOf r
adamc@1215 520 | NONE =>
adamc@1215 521 let
adamc@1215 522 val r = ref (Node {Rep = ref NONE,
adamc@1215 523 Cons = ref SM.empty,
adamc@1215 524 Variety = Nothing,
adamc@1215 525 Known = ref false})
adamc@1215 526 in
adamc@1215 527 #Vars db := IM.insert (!(#Vars db), n, r);
adamc@1215 528 r
adamc@1215 529 end)
adamc@1215 530 | Lvar n =>
adamc@1215 531 (case IM.find (!unif, n) of
adamc@1215 532 NONE => raise Undetermined
adamc@1215 533 | SOME e => rep e)
adamc@1215 534 | Func (DtCon0 f, []) => (case SM.find (!(#Con0s db), f) of
adamc@1215 535 SOME r => repOf r
adamc@1215 536 | NONE =>
adamc@1215 537 let
adamc@1215 538 val r = ref (Node {Rep = ref NONE,
adamc@1215 539 Cons = ref SM.empty,
adamc@1215 540 Variety = Dt0 f,
adamc@1218 541 Known = ref true})
adamc@1215 542 in
adamc@1215 543 #Con0s db := SM.insert (!(#Con0s db), f, r);
adamc@1215 544 r
adamc@1215 545 end)
adamc@1215 546 | Func (DtCon0 _, _) => raise Fail "Iflow.rep: DtCon0"
adamc@1215 547 | Func (DtCon1 f, [e]) =>
adamc@1215 548 let
adamc@1215 549 val r = rep e
adamc@1215 550 in
adamc@1215 551 case SM.find (!(#Cons (unNode r)), f) of
adamc@1215 552 SOME r => repOf r
adamc@1215 553 | NONE =>
adamc@1215 554 let
adamc@1215 555 val r' = ref (Node {Rep = ref NONE,
adamc@1215 556 Cons = ref SM.empty,
adamc@1215 557 Variety = Dt1 (f, r),
adamc@1216 558 Known = #Known (unNode r)})
adamc@1215 559 in
adamc@1215 560 #Cons (unNode r) := SM.insert (!(#Cons (unNode r)), f, r');
adamc@1215 561 r'
adamc@1215 562 end
adamc@1215 563 end
adamc@1215 564 | Func (DtCon1 _, _) => raise Fail "Iflow.rep: DtCon1"
adamc@1215 565 | Func (UnCon f, [e]) =>
adamc@1215 566 let
adamc@1215 567 val r = rep e
adamc@1215 568 in
adamc@1215 569 case #Variety (unNode r) of
adamc@1215 570 Dt1 (f', n) => if f' = f then
adamc@1215 571 repOf n
adamc@1215 572 else
adamc@1215 573 raise Contradiction
adamc@1215 574 | Nothing =>
adamc@1215 575 let
adamc@1215 576 val cons = ref SM.empty
adamc@1215 577 val r' = ref (Node {Rep = ref NONE,
adamc@1215 578 Cons = cons,
adamc@1215 579 Variety = Nothing,
adamc@1216 580 Known = #Known (unNode r)})
adamc@1215 581
adamc@1215 582 val r'' = ref (Node {Rep = ref NONE,
adamc@1215 583 Cons = #Cons (unNode r),
adamc@1215 584 Variety = Dt1 (f, r'),
adamc@1215 585 Known = #Known (unNode r)})
adamc@1215 586 in
adamc@1215 587 cons := SM.insert (!cons, f, r'');
adamc@1215 588 #Rep (unNode r) := SOME r'';
adamc@1215 589 r'
adamc@1215 590 end
adamc@1215 591 | VFinish => r
adamc@1215 592 | _ => raise Contradiction
adamc@1215 593 end
adamc@1215 594 | Func (UnCon _, _) => raise Fail "Iflow.rep: UnCon"
adamc@1215 595 | Func (Other f, es) =>
adamc@1215 596 let
adamc@1215 597 val rs = map rep es
adamc@1215 598 in
adamc@1215 599 case List.find (fn (x : string * representative list, _) => x = (f, rs)) (!(#Funcs db)) of
adamc@1215 600 NONE =>
adamc@1215 601 let
adamc@1215 602 val r = ref (Node {Rep = ref NONE,
adamc@1215 603 Cons = ref SM.empty,
adamc@1215 604 Variety = Nothing,
adamc@1215 605 Known = ref false})
adamc@1215 606 in
adamc@1215 607 #Funcs db := ((f, rs), r) :: (!(#Funcs db));
adamc@1215 608 r
adamc@1215 609 end
adamc@1215 610 | SOME (_, r) => repOf r
adamc@1215 611 end
adamc@1215 612 | Recd xes =>
adamc@1215 613 let
adamc@1215 614 val xes = map (fn (x, e) => (x, rep e)) xes
adamc@1215 615 val len = length xes
adamc@1215 616 in
adamc@1215 617 case List.find (fn (xes', _) =>
adamc@1215 618 SM.numItems xes' = len
adamc@1215 619 andalso List.all (fn (x, n) =>
adamc@1215 620 case SM.find (xes', x) of
adamc@1215 621 NONE => false
adamc@1215 622 | SOME n' => n = repOf n') xes)
adamc@1215 623 (!(#Records db)) of
adamc@1215 624 SOME (_, r) => repOf r
adamc@1215 625 | NONE =>
adamc@1215 626 let
adamc@1215 627 val xes = foldl SM.insert' SM.empty xes
adamc@1215 628
adamc@1215 629 val r' = ref (Node {Rep = ref NONE,
adamc@1215 630 Cons = ref SM.empty,
adamc@1215 631 Variety = Recrd (ref xes),
adamc@1215 632 Known = ref false})
adamc@1215 633 in
adamc@1215 634 #Records db := (xes, r') :: (!(#Records db));
adamc@1215 635 r'
adamc@1215 636 end
adamc@1215 637 end
adamc@1215 638 | Proj (e, f) =>
adamc@1215 639 let
adamc@1215 640 val r = rep e
adamc@1215 641 in
adamc@1215 642 case #Variety (unNode r) of
adamc@1215 643 Recrd xes =>
adamc@1215 644 (case SM.find (!xes, f) of
adamc@1215 645 SOME r => repOf r
adamc@1216 646 | NONE => let
adamc@1215 647 val r = ref (Node {Rep = ref NONE,
adamc@1215 648 Cons = ref SM.empty,
adamc@1215 649 Variety = Nothing,
adamc@1216 650 Known = #Known (unNode r)})
adamc@1215 651 in
adamc@1215 652 xes := SM.insert (!xes, f, r);
adamc@1215 653 r
adamc@1215 654 end)
adamc@1215 655 | Nothing =>
adamc@1215 656 let
adamc@1215 657 val r' = ref (Node {Rep = ref NONE,
adamc@1215 658 Cons = ref SM.empty,
adamc@1215 659 Variety = Nothing,
adamc@1216 660 Known = #Known (unNode r)})
adamc@1215 661
adamc@1215 662 val r'' = ref (Node {Rep = ref NONE,
adamc@1215 663 Cons = #Cons (unNode r),
adamc@1215 664 Variety = Recrd (ref (SM.insert (SM.empty, f, r'))),
adamc@1215 665 Known = #Known (unNode r)})
adamc@1215 666 in
adamc@1215 667 #Rep (unNode r) := SOME r'';
adamc@1215 668 r'
adamc@1215 669 end
adamc@1215 670 | VFinish => r
adamc@1215 671 | _ => raise Contradiction
adamc@1215 672 end
adamc@1215 673 | Finish => finish
adamc@1208 674 in
adamc@1215 675 rep e
adamc@1208 676 end
adamc@1208 677
adamc@1215 678 fun assert (db, a) =
adamc@1215 679 case a of
adamc@1215 680 ACond _ => ()
adamc@1215 681 | AReln x =>
adamc@1215 682 case x of
adamc@1215 683 (Known, [e]) => markKnown (representative (db, e))
adamc@1215 684 | (PCon0 f, [e]) =>
adamc@1215 685 let
adamc@1215 686 val r = representative (db, e)
adamc@1215 687 in
adamc@1215 688 case #Variety (unNode r) of
adamc@1215 689 Dt0 f' => if f = f' then
adamc@1215 690 ()
adamc@1215 691 else
adamc@1215 692 raise Contradiction
adamc@1215 693 | Nothing =>
adamc@1215 694 let
adamc@1215 695 val r' = ref (Node {Rep = ref NONE,
adamc@1215 696 Cons = ref SM.empty,
adamc@1215 697 Variety = Dt0 f,
adamc@1215 698 Known = ref false})
adamc@1215 699 in
adamc@1215 700 #Rep (unNode r) := SOME r'
adamc@1215 701 end
adamc@1215 702 | _ => raise Contradiction
adamc@1215 703 end
adamc@1215 704 | (PCon1 f, [e]) =>
adamc@1215 705 let
adamc@1215 706 val r = representative (db, e)
adamc@1215 707 in
adamc@1215 708 case #Variety (unNode r) of
adamc@1215 709 Dt1 (f', e') => if f = f' then
adamc@1215 710 ()
adamc@1215 711 else
adamc@1215 712 raise Contradiction
adamc@1215 713 | Nothing =>
adamc@1215 714 let
adamc@1215 715 val r'' = ref (Node {Rep = ref NONE,
adamc@1215 716 Cons = ref SM.empty,
adamc@1215 717 Variety = Nothing,
adamc@1215 718 Known = ref false})
adamc@1214 719
adamc@1215 720 val r' = ref (Node {Rep = ref NONE,
adamc@1215 721 Cons = ref SM.empty,
adamc@1215 722 Variety = Dt1 (f, r''),
adamc@1215 723 Known = ref false})
adamc@1215 724 in
adamc@1215 725 #Rep (unNode r) := SOME r'
adamc@1215 726 end
adamc@1215 727 | _ => raise Contradiction
adamc@1215 728 end
adamc@1215 729 | (Eq, [e1, e2]) =>
adamc@1215 730 let
adamc@1215 731 fun markEq (r1, r2) =
adamc@1215 732 if r1 = r2 then
adamc@1215 733 ()
adamc@1215 734 else case (#Variety (unNode r1), #Variety (unNode r2)) of
adamc@1215 735 (Prim p1, Prim p2) => if Prim.equal (p1, p2) then
adamc@1215 736 ()
adamc@1215 737 else
adamc@1215 738 raise Contradiction
adamc@1215 739 | (Dt0 f1, Dt0 f2) => if f1 = f2 then
adamc@1215 740 ()
adamc@1215 741 else
adamc@1215 742 raise Contradiction
adamc@1215 743 | (Dt1 (f1, r1), Dt1 (f2, r2)) => if f1 = f2 then
adamc@1215 744 markEq (r1, r2)
adamc@1215 745 else
adamc@1215 746 raise Contradiction
adamc@1215 747 | (Recrd xes1, Recrd xes2) =>
adamc@1215 748 let
adamc@1215 749 fun unif (xes1, xes2) =
adamc@1215 750 SM.appi (fn (x, r1) =>
adamc@1215 751 case SM.find (xes2, x) of
adamc@1215 752 NONE => ()
adamc@1215 753 | SOME r2 => markEq (r1, r2)) xes1
adamc@1215 754 in
adamc@1215 755 unif (!xes1, !xes2);
adamc@1215 756 unif (!xes2, !xes1)
adamc@1215 757 end
adamc@1215 758 | (VFinish, VFinish) => ()
adamc@1218 759 | (Nothing, _) => mergeNodes (r1, r2)
adamc@1218 760 | (_, Nothing) => mergeNodes (r2, r1)
adamc@1215 761 | _ => raise Contradiction
adamc@1214 762
adamc@1218 763 and mergeNodes (r1, r2) =
adamc@1218 764 (#Rep (unNode r1) := SOME r2;
adamc@1218 765 if !(#Known (unNode r1)) then
adamc@1218 766 markKnown r2
adamc@1218 767 else
adamc@1218 768 ();
adamc@1218 769 if !(#Known (unNode r2)) then
adamc@1218 770 markKnown r1
adamc@1218 771 else
adamc@1218 772 ();
adamc@1218 773 #Cons (unNode r2) := SM.unionWith #1 (!(#Cons (unNode r2)), !(#Cons (unNode r1)));
adamc@1218 774 compactFuncs ())
adamc@1218 775
adamc@1215 776 and compactFuncs () =
adamc@1214 777 let
adamc@1215 778 fun loop funcs =
adamc@1215 779 case funcs of
adamc@1215 780 [] => []
adamc@1215 781 | (fr as ((f, rs), r)) :: rest =>
adamc@1215 782 let
adamc@1215 783 val rest = List.filter (fn ((f' : string, rs'), r') =>
adamc@1215 784 if f' = f
adamc@1215 785 andalso ListPair.allEq (fn (r1, r2) =>
adamc@1215 786 repOf r1 = repOf r2)
adamc@1215 787 (rs, rs') then
adamc@1215 788 (markEq (r, r');
adamc@1215 789 false)
adamc@1215 790 else
adamc@1215 791 true) rest
adamc@1215 792 in
adamc@1215 793 fr :: loop rest
adamc@1215 794 end
adamc@1214 795 in
adamc@1215 796 #Funcs db := loop (!(#Funcs db))
adamc@1214 797 end
adamc@1215 798 in
adamc@1215 799 markEq (representative (db, e1), representative (db, e2))
adamc@1215 800 end
adamc@1215 801 | _ => ()
adamc@1214 802
adamc@1215 803 fun check (db, a) =
adamc@1215 804 case a of
adamc@1215 805 ACond _ => false
adamc@1215 806 | AReln x =>
adamc@1215 807 case x of
adamc@1215 808 (Known, [e]) => !(#Known (unNode (representative (db, e))))
adamc@1215 809 | (PCon0 f, [e]) =>
adamc@1215 810 (case #Variety (unNode (representative (db, e))) of
adamc@1215 811 Dt0 f' => f' = f
adamc@1215 812 | _ => false)
adamc@1215 813 | (PCon1 f, [e]) =>
adamc@1215 814 (case #Variety (unNode (representative (db, e))) of
adamc@1215 815 Dt1 (f', _) => f' = f
adamc@1215 816 | _ => false)
adamc@1215 817 | (Eq, [e1, e2]) =>
adamc@1214 818 let
adamc@1215 819 val r1 = representative (db, e1)
adamc@1215 820 val r2 = representative (db, e2)
adamc@1214 821 in
adamc@1215 822 repOf r1 = repOf r2
adamc@1214 823 end
adamc@1215 824 | _ => false
adamc@1212 825
adamc@1218 826 fun builtFrom (db, {Base = bs, Derived = d}) =
adamc@1218 827 let
adamc@1218 828 val bs = map (fn b => representative (db, b)) bs
adamc@1218 829
adamc@1218 830 fun loop d =
adamc@1218 831 let
adamc@1218 832 val d = repOf d
adamc@1218 833 in
adamc@1218 834 List.exists (fn b => repOf b = d) bs
adamc@1218 835 orelse case #Variety (unNode d) of
adamc@1218 836 Dt0 _ => true
adamc@1218 837 | Dt1 (_, d) => loop d
adamc@1218 838 | Prim _ => true
adamc@1218 839 | Recrd xes => List.all loop (SM.listItems (!xes))
adamc@1218 840 | VFinish => true
adamc@1218 841 | Nothing => false
adamc@1218 842 end
adamc@1218 843 in
adamc@1218 844 loop (representative (db, d))
adamc@1218 845 end
adamc@1218 846
adamc@1208 847 end
adamc@1208 848
adamc@1215 849 fun decomp fals or =
adamc@1215 850 let
adamc@1215 851 fun decomp p k =
adamc@1215 852 case p of
adamc@1215 853 True => k []
adamc@1215 854 | False => fals
adamc@1215 855 | Unknown => k []
adamc@1215 856 | And (p1, p2) =>
adamc@1215 857 decomp p1 (fn ps1 =>
adamc@1215 858 decomp p2 (fn ps2 =>
adamc@1215 859 k (ps1 @ ps2)))
adamc@1215 860 | Or (p1, p2) =>
adamc@1215 861 or (decomp p1 k, fn () => decomp p2 k)
adamc@1215 862 | Reln x => k [AReln x]
adamc@1215 863 | Cond x => k [ACond x]
adamc@1215 864 in
adamc@1215 865 decomp
adamc@1215 866 end
adamc@1202 867
adamc@1218 868 fun imply (hyps, goals, outs) =
adamc@1218 869 let
adamc@1218 870 fun gls goals onFail acc =
adamc@1218 871 case goals of
adamc@1218 872 [] =>
adamc@1218 873 (let
adamc@1218 874 val cc = Cc.database ()
adamc@1218 875 val () = app (fn a => Cc.assert (cc, a)) hyps
adamc@1218 876 in
adamc@1218 877 (List.all (fn a =>
adamc@1218 878 if Cc.check (cc, a) then
adamc@1218 879 true
adamc@1218 880 else
adamc@1218 881 ((*Print.prefaces "Can't prove"
adamc@1218 882 [("a", p_atom a),
adamc@1218 883 ("hyps", Print.p_list p_atom hyps),
adamc@1218 884 ("db", Cc.p_database cc)];*)
adamc@1218 885 false)) acc
adamc@1218 886 (*andalso (Print.preface ("Finding", Cc.p_database cc); true)*)
adamc@1218 887 andalso Cc.builtFrom (cc, {Derived = Var 0,
adamc@1218 888 Base = outs}))
adamc@1218 889 handle Cc.Contradiction => false
adamc@1218 890 end handle Cc.Undetermined => false)
adamc@1218 891 orelse onFail ()
adamc@1218 892 | (g as AReln (Sql gf, [ge])) :: goals =>
adamc@1218 893 let
adamc@1218 894 fun hps hyps =
adamc@1218 895 case hyps of
adamc@1218 896 [] => gls goals onFail (g :: acc)
adamc@1218 897 | (h as AReln (Sql hf, [he])) :: hyps =>
adamc@1218 898 if gf = hf then
adamc@1218 899 let
adamc@1218 900 val saved = save ()
adamc@1218 901 in
adamc@1218 902 if eq (ge, he) then
adamc@1218 903 let
adamc@1218 904 val changed = IM.numItems (!unif)
adamc@1218 905 <> IM.numItems saved
adamc@1218 906 in
adamc@1218 907 gls goals (fn () => (restore saved;
adamc@1218 908 changed
adamc@1218 909 andalso hps hyps))
adamc@1218 910 acc
adamc@1218 911 end
adamc@1218 912 else
adamc@1218 913 hps hyps
adamc@1218 914 end
adamc@1218 915 else
adamc@1218 916 hps hyps
adamc@1218 917 | _ :: hyps => hps hyps
adamc@1218 918 in
adamc@1218 919 hps hyps
adamc@1218 920 end
adamc@1218 921 | g :: goals => gls goals onFail (g :: acc)
adamc@1218 922 in
adamc@1218 923 reset ();
adamc@1218 924 (*Print.prefaces "Big go" [("hyps", Print.p_list p_atom hyps),
adamc@1218 925 ("goals", Print.p_list p_atom goals)];*)
adamc@1218 926 gls goals (fn () => false) []
adamc@1218 927 end handle Cc.Contradiction => true
adamc@1200 928
adamc@1200 929 fun patCon pc =
adamc@1200 930 case pc of
adamc@1200 931 PConVar n => "C" ^ Int.toString n
adamc@1200 932 | PConFfi {mod = m, datatyp = d, con = c, ...} => m ^ "." ^ d ^ "." ^ c
adamc@1200 933
adamc@1200 934 datatype chunk =
adamc@1200 935 String of string
adamc@1200 936 | Exp of Mono.exp
adamc@1200 937
adamc@1200 938 fun chunkify e =
adamc@1200 939 case #1 e of
adamc@1200 940 EPrim (Prim.String s) => [String s]
adamc@1207 941 | EStrcat (e1, e2) =>
adamc@1207 942 let
adamc@1207 943 val chs1 = chunkify e1
adamc@1207 944 val chs2 = chunkify e2
adamc@1207 945 in
adamc@1207 946 case chs2 of
adamc@1207 947 String s2 :: chs2' =>
adamc@1207 948 (case List.last chs1 of
adamc@1207 949 String s1 => List.take (chs1, length chs1 - 1) @ String (s1 ^ s2) :: chs2'
adamc@1207 950 | _ => chs1 @ chs2)
adamc@1207 951 | _ => chs1 @ chs2
adamc@1207 952 end
adamc@1200 953 | _ => [Exp e]
adamc@1200 954
adamc@1201 955 type 'a parser = chunk list -> ('a * chunk list) option
adamc@1201 956
adamc@1201 957 fun always v chs = SOME (v, chs)
adamc@1201 958
adamc@1202 959 fun parse p s =
adamc@1202 960 case p (chunkify s) of
adamc@1201 961 SOME (v, []) => SOME v
adamc@1201 962 | _ => NONE
adamc@1201 963
adamc@1201 964 fun const s chs =
adamc@1201 965 case chs of
adamc@1201 966 String s' :: chs => if String.isPrefix s s' then
adamc@1201 967 SOME ((), if size s = size s' then
adamc@1201 968 chs
adamc@1201 969 else
adamc@1201 970 String (String.extract (s', size s, NONE)) :: chs)
adamc@1201 971 else
adamc@1201 972 NONE
adamc@1201 973 | _ => NONE
adamc@1201 974
adamc@1201 975 fun follow p1 p2 chs =
adamc@1201 976 case p1 chs of
adamc@1201 977 NONE => NONE
adamc@1201 978 | SOME (v1, chs) =>
adamc@1201 979 case p2 chs of
adamc@1201 980 NONE => NONE
adamc@1201 981 | SOME (v2, chs) => SOME ((v1, v2), chs)
adamc@1201 982
adamc@1201 983 fun wrap p f chs =
adamc@1201 984 case p chs of
adamc@1201 985 NONE => NONE
adamc@1201 986 | SOME (v, chs) => SOME (f v, chs)
adamc@1201 987
adamc@1209 988 fun wrapP p f chs =
adamc@1209 989 case p chs of
adamc@1209 990 NONE => NONE
adamc@1209 991 | SOME (v, chs) =>
adamc@1209 992 case f v of
adamc@1209 993 NONE => NONE
adamc@1209 994 | SOME r => SOME (r, chs)
adamc@1209 995
adamc@1201 996 fun alt p1 p2 chs =
adamc@1201 997 case p1 chs of
adamc@1201 998 NONE => p2 chs
adamc@1201 999 | v => v
adamc@1201 1000
adamc@1207 1001 fun altL ps =
adamc@1207 1002 case rev ps of
adamc@1207 1003 [] => (fn _ => NONE)
adamc@1207 1004 | p :: ps =>
adamc@1207 1005 foldl (fn (p1, p2) => alt p1 p2) p ps
adamc@1207 1006
adamc@1204 1007 fun opt p chs =
adamc@1204 1008 case p chs of
adamc@1204 1009 NONE => SOME (NONE, chs)
adamc@1204 1010 | SOME (v, chs) => SOME (SOME v, chs)
adamc@1204 1011
adamc@1201 1012 fun skip cp chs =
adamc@1201 1013 case chs of
adamc@1201 1014 String "" :: chs => skip cp chs
adamc@1201 1015 | String s :: chs' => if cp (String.sub (s, 0)) then
adamc@1201 1016 skip cp (String (String.extract (s, 1, NONE)) :: chs')
adamc@1201 1017 else
adamc@1201 1018 SOME ((), chs)
adamc@1201 1019 | _ => SOME ((), chs)
adamc@1201 1020
adamc@1201 1021 fun keep cp chs =
adamc@1201 1022 case chs of
adamc@1201 1023 String "" :: chs => keep cp chs
adamc@1201 1024 | String s :: chs' =>
adamc@1201 1025 let
adamc@1201 1026 val (befor, after) = Substring.splitl cp (Substring.full s)
adamc@1201 1027 in
adamc@1201 1028 if Substring.isEmpty befor then
adamc@1201 1029 NONE
adamc@1201 1030 else
adamc@1201 1031 SOME (Substring.string befor,
adamc@1201 1032 if Substring.isEmpty after then
adamc@1201 1033 chs'
adamc@1201 1034 else
adamc@1201 1035 String (Substring.string after) :: chs')
adamc@1201 1036 end
adamc@1201 1037 | _ => NONE
adamc@1201 1038
adamc@1204 1039 fun ws p = wrap (follow (skip (fn ch => ch = #" "))
adamc@1204 1040 (follow p (skip (fn ch => ch = #" ")))) (#1 o #2)
adamc@1204 1041
adamc@1204 1042 fun log name p chs =
adamc@1206 1043 (if !debug then
adamc@1206 1044 case chs of
adamc@1207 1045 String s :: _ => print (name ^ ": " ^ s ^ "\n")
adamc@1206 1046 | _ => print (name ^ ": blocked!\n")
adamc@1206 1047 else
adamc@1206 1048 ();
adamc@1204 1049 p chs)
adamc@1201 1050
adamc@1201 1051 fun list p chs =
adamc@1207 1052 altL [wrap (follow p (follow (ws (const ",")) (list p)))
adamc@1207 1053 (fn (v, ((), ls)) => v :: ls),
adamc@1207 1054 wrap (ws p) (fn v => [v]),
adamc@1207 1055 always []] chs
adamc@1201 1056
adamc@1201 1057 val ident = keep (fn ch => Char.isAlphaNum ch orelse ch = #"_")
adamc@1201 1058
adamc@1211 1059 val t_ident = wrapP ident (fn s => if String.isPrefix "T_" s then
adamc@1211 1060 SOME (String.extract (s, 2, NONE))
adamc@1201 1061 else
adamc@1211 1062 NONE)
adamc@1211 1063 val uw_ident = wrapP ident (fn s => if String.isPrefix "uw_" s andalso size s >= 4 then
adamc@1211 1064 SOME (str (Char.toUpper (String.sub (s, 3)))
adamc@1211 1065 ^ String.extract (s, 4, NONE))
adamc@1211 1066 else
adamc@1211 1067 NONE)
adamc@1201 1068
adamc@1211 1069 val field = wrap (follow t_ident
adamc@1201 1070 (follow (const ".")
adamc@1201 1071 uw_ident))
adamc@1201 1072 (fn (t, ((), f)) => (t, f))
adamc@1201 1073
adamc@1206 1074 datatype Rel =
adamc@1206 1075 Exps of exp * exp -> prop
adamc@1206 1076 | Props of prop * prop -> prop
adamc@1206 1077
adamc@1204 1078 datatype sqexp =
adamc@1206 1079 SqConst of Prim.t
adamc@1206 1080 | Field of string * string
adamc@1206 1081 | Binop of Rel * sqexp * sqexp
adamc@1207 1082 | SqKnown of sqexp
adamc@1207 1083 | Inj of Mono.exp
adamc@1211 1084 | SqFunc of string * sqexp
adamc@1211 1085 | Count
adamc@1204 1086
adamc@1210 1087 fun cmp s r = wrap (const s) (fn () => Exps (fn (e1, e2) => Reln (r, [e1, e2])))
adamc@1210 1088
adamc@1210 1089 val sqbrel = altL [cmp "=" Eq,
adamc@1210 1090 cmp "<>" Ne,
adamc@1210 1091 cmp "<=" Le,
adamc@1210 1092 cmp "<" Lt,
adamc@1210 1093 cmp ">=" Ge,
adamc@1210 1094 cmp ">" Gt,
adamc@1207 1095 wrap (const "AND") (fn () => Props And),
adamc@1207 1096 wrap (const "OR") (fn () => Props Or)]
adamc@1204 1097
adamc@1204 1098 datatype ('a, 'b) sum = inl of 'a | inr of 'b
adamc@1204 1099
adamc@1209 1100 fun string chs =
adamc@1206 1101 case chs of
adamc@1209 1102 String s :: chs =>
adamc@1209 1103 if size s >= 2 andalso String.sub (s, 0) = #"'" then
adamc@1209 1104 let
adamc@1209 1105 fun loop (cs, acc) =
adamc@1209 1106 case cs of
adamc@1209 1107 [] => NONE
adamc@1209 1108 | c :: cs =>
adamc@1209 1109 if c = #"'" then
adamc@1209 1110 SOME (String.implode (rev acc), cs)
adamc@1209 1111 else if c = #"\\" then
adamc@1209 1112 case cs of
adamc@1209 1113 c :: cs => loop (cs, c :: acc)
adamc@1209 1114 | _ => raise Fail "Iflow.string: Unmatched backslash escape"
adamc@1209 1115 else
adamc@1209 1116 loop (cs, c :: acc)
adamc@1209 1117 in
adamc@1209 1118 case loop (String.explode (String.extract (s, 1, NONE)), []) of
adamc@1209 1119 NONE => NONE
adamc@1209 1120 | SOME (s, []) => SOME (s, chs)
adamc@1209 1121 | SOME (s, cs) => SOME (s, String (String.implode cs) :: chs)
adamc@1209 1122 end
adamc@1209 1123 else
adamc@1209 1124 NONE
adamc@1209 1125 | _ => NONE
adamc@1206 1126
adamc@1209 1127 val prim =
adamc@1209 1128 altL [wrap (follow (wrapP (follow (keep Char.isDigit) (follow (const ".") (keep Char.isDigit)))
adamc@1209 1129 (fn (x, ((), y)) => Option.map Prim.Float (Real64.fromString (x ^ "." ^ y))))
adamc@1209 1130 (opt (const "::float8"))) #1,
adamc@1209 1131 wrap (follow (wrapP (keep Char.isDigit)
adamc@1209 1132 (Option.map Prim.Int o Int64.fromString))
adamc@1209 1133 (opt (const "::int8"))) #1,
adamc@1209 1134 wrap (follow (opt (const "E")) (follow string (opt (const "::text"))))
adamc@1209 1135 (Prim.String o #1 o #2)]
adamc@1206 1136
adamc@1207 1137 fun known' chs =
adamc@1207 1138 case chs of
adamc@1207 1139 Exp (EFfi ("Basis", "sql_known"), _) :: chs => SOME ((), chs)
adamc@1207 1140 | _ => NONE
adamc@1207 1141
adamc@1207 1142 fun sqlify chs =
adamc@1207 1143 case chs of
adamc@1207 1144 Exp (EFfiApp ("Basis", f, [e]), _) :: chs =>
adamc@1207 1145 if String.isPrefix "sqlify" f then
adamc@1207 1146 SOME (e, chs)
adamc@1207 1147 else
adamc@1207 1148 NONE
adamc@1207 1149 | _ => NONE
adamc@1207 1150
adamc@1211 1151 fun constK s = wrap (const s) (fn () => s)
adamc@1211 1152
adamc@1211 1153 val funcName = altL [constK "COUNT",
adamc@1211 1154 constK "MIN",
adamc@1211 1155 constK "MAX",
adamc@1211 1156 constK "SUM",
adamc@1211 1157 constK "AVG"]
adamc@1211 1158
adamc@1204 1159 fun sqexp chs =
adamc@1206 1160 log "sqexp"
adamc@1207 1161 (altL [wrap prim SqConst,
adamc@1211 1162 wrap field Field,
adamc@1207 1163 wrap known SqKnown,
adamc@1211 1164 wrap func SqFunc,
adamc@1211 1165 wrap (const "COUNT(*)") (fn () => Count),
adamc@1207 1166 wrap sqlify Inj,
adamc@1211 1167 wrap (follow (const "COALESCE(") (follow sqexp (follow (const ",")
adamc@1211 1168 (follow (keep (fn ch => ch <> #")")) (const ")")))))
adamc@1211 1169 (fn ((), (e, _)) => e),
adamc@1207 1170 wrap (follow (ws (const "("))
adamc@1207 1171 (follow (wrap
adamc@1207 1172 (follow sqexp
adamc@1207 1173 (alt
adamc@1207 1174 (wrap
adamc@1207 1175 (follow (ws sqbrel)
adamc@1207 1176 (ws sqexp))
adamc@1207 1177 inl)
adamc@1207 1178 (always (inr ()))))
adamc@1207 1179 (fn (e1, sm) =>
adamc@1207 1180 case sm of
adamc@1207 1181 inl (bo, e2) => Binop (bo, e1, e2)
adamc@1207 1182 | inr () => e1))
adamc@1207 1183 (const ")")))
adamc@1207 1184 (fn ((), (e, ())) => e)])
adamc@1207 1185 chs
adamc@1206 1186
adamc@1207 1187 and known chs = wrap (follow known' (follow (const "(") (follow sqexp (const ")"))))
adamc@1211 1188 (fn ((), ((), (e, ()))) => e) chs
adamc@1211 1189
adamc@1211 1190 and func chs = wrap (follow funcName (follow (const "(") (follow sqexp (const ")"))))
adamc@1211 1191 (fn (f, ((), (e, ()))) => (f, e)) chs
adamc@1211 1192
adamc@1211 1193 datatype sitem =
adamc@1211 1194 SqField of string * string
adamc@1211 1195 | SqExp of sqexp * string
adamc@1211 1196
adamc@1211 1197 val sitem = alt (wrap field SqField)
adamc@1211 1198 (wrap (follow sqexp (follow (const " AS ") uw_ident))
adamc@1211 1199 (fn (e, ((), s)) => SqExp (e, s)))
adamc@1207 1200
adamc@1207 1201 val select = log "select"
adamc@1207 1202 (wrap (follow (const "SELECT ") (list sitem))
adamc@1207 1203 (fn ((), ls) => ls))
adamc@1201 1204
adamc@1201 1205 val fitem = wrap (follow uw_ident
adamc@1201 1206 (follow (const " AS ")
adamc@1201 1207 t_ident))
adamc@1201 1208 (fn (t, ((), f)) => (t, f))
adamc@1201 1209
adamc@1207 1210 val from = log "from"
adamc@1207 1211 (wrap (follow (const "FROM ") (list fitem))
adamc@1207 1212 (fn ((), ls) => ls))
adamc@1201 1213
adamc@1204 1214 val wher = wrap (follow (ws (const "WHERE ")) sqexp)
adamc@1204 1215 (fn ((), ls) => ls)
adamc@1204 1216
adamc@1207 1217 val query = log "query"
adamc@1207 1218 (wrap (follow (follow select from) (opt wher))
adamc@1207 1219 (fn ((fs, ts), wher) => {Select = fs, From = ts, Where = wher}))
adamc@1201 1220
adamc@1215 1221 fun removeDups (ls : (string * string) list) =
adamc@1211 1222 case ls of
adamc@1211 1223 [] => []
adamc@1211 1224 | x :: ls =>
adamc@1211 1225 let
adamc@1211 1226 val ls = removeDups ls
adamc@1211 1227 in
adamc@1211 1228 if List.exists (fn x' => x' = x) ls then
adamc@1211 1229 ls
adamc@1211 1230 else
adamc@1211 1231 x :: ls
adamc@1211 1232 end
adamc@1211 1233
adamc@1212 1234 datatype queryMode =
adamc@1218 1235 SomeCol
adamc@1212 1236 | AllCols of exp
adamc@1212 1237
adamc@1216 1238 exception Default
adamc@1216 1239
adamc@1214 1240 fun queryProp env rvN rv oe e =
adamc@1216 1241 let
adamc@1216 1242 fun default () = (print ("Warning: Information flow checker can't parse SQL query at "
adamc@1216 1243 ^ ErrorMsg.spanToString (#2 e) ^ "\n");
adamc@1218 1244 (rvN, Unknown, Unknown, [], []))
adamc@1216 1245 in
adamc@1216 1246 case parse query e of
adamc@1216 1247 NONE => default ()
adamc@1216 1248 | SOME r =>
adamc@1216 1249 let
adamc@1216 1250 val (rvs, rvN) = ListUtil.foldlMap (fn ((_, v), rvN) =>
adamc@1216 1251 let
adamc@1216 1252 val (rvN, e) = rv rvN
adamc@1216 1253 in
adamc@1216 1254 ((v, e), rvN)
adamc@1216 1255 end) rvN (#From r)
adamc@1214 1256
adamc@1216 1257 fun rvOf v =
adamc@1216 1258 case List.find (fn (v', _) => v' = v) rvs of
adamc@1216 1259 NONE => raise Fail "Iflow.queryProp: Bad table variable"
adamc@1216 1260 | SOME (_, e) => e
adamc@1214 1261
adamc@1216 1262 fun usedFields e =
adamc@1216 1263 case e of
adamc@1216 1264 SqConst _ => []
adamc@1216 1265 | Field (v, f) => [(v, f)]
adamc@1216 1266 | Binop (_, e1, e2) => removeDups (usedFields e1 @ usedFields e2)
adamc@1216 1267 | SqKnown _ => []
adamc@1216 1268 | Inj _ => []
adamc@1216 1269 | SqFunc (_, e) => usedFields e
adamc@1216 1270 | Count => []
adamc@1214 1271
adamc@1216 1272 val p =
adamc@1216 1273 foldl (fn ((t, v), p) => And (p, Reln (Sql t, [rvOf v]))) True (#From r)
adamc@1211 1274
adamc@1216 1275 fun expIn e =
adamc@1216 1276 case e of
adamc@1216 1277 SqConst p => inl (Const p)
adamc@1216 1278 | Field (v, f) => inl (Proj (rvOf v, f))
adamc@1216 1279 | Binop (bo, e1, e2) =>
adamc@1216 1280 inr (case (bo, expIn e1, expIn e2) of
adamc@1216 1281 (Exps f, inl e1, inl e2) => f (e1, e2)
adamc@1216 1282 | (Props f, inr p1, inr p2) => f (p1, p2)
adamc@1216 1283 | _ => Unknown)
adamc@1216 1284 | SqKnown e =>
adamc@1216 1285 inr (case expIn e of
adamc@1216 1286 inl e => Reln (Known, [e])
adamc@1216 1287 | _ => Unknown)
adamc@1216 1288 | Inj e =>
adamc@1216 1289 let
adamc@1216 1290 fun deinj (e, _) =
adamc@1216 1291 case e of
adamc@1216 1292 ERel n => List.nth (env, n)
adamc@1216 1293 | EField (e, f) => Proj (deinj e, f)
adamc@1216 1294 | _ => raise Fail "Iflow: non-variable injected into query"
adamc@1216 1295 in
adamc@1216 1296 inl (deinj e)
adamc@1216 1297 end
adamc@1216 1298 | SqFunc (f, e) =>
adamc@1216 1299 inl (case expIn e of
adamc@1216 1300 inl e => Func (Other f, [e])
adamc@1216 1301 | _ => raise Fail ("Iflow: non-expresion passed to function " ^ f))
adamc@1216 1302 | Count => raise Default
adamc@1205 1303
adamc@1216 1304 val p = case #Where r of
adamc@1216 1305 NONE => p
adamc@1216 1306 | SOME e =>
adamc@1216 1307 case expIn e of
adamc@1216 1308 inr p' => And (p, p')
adamc@1216 1309 | _ => p
adamc@1210 1310
adamc@1216 1311 fun normal () =
adamc@1218 1312 case oe of
adamc@1218 1313 SomeCol =>
adamc@1218 1314 (rvN, p, True,
adamc@1218 1315 List.mapPartial (fn si =>
adamc@1218 1316 case si of
adamc@1218 1317 SqField (v, f) => SOME (Proj (rvOf v, f))
adamc@1218 1318 | SqExp (e, f) =>
adamc@1218 1319 case expIn e of
adamc@1218 1320 inr _ => NONE
adamc@1218 1321 | inl e => SOME e) (#Select r))
adamc@1218 1322 | AllCols oe =>
adamc@1218 1323 (rvN, And (p, foldl (fn (si, p) =>
adamc@1218 1324 let
adamc@1218 1325 val p' = case si of
adamc@1218 1326 SqField (v, f) => Reln (Eq, [Proj (Proj (oe, v), f),
adamc@1218 1327 Proj (rvOf v, f)])
adamc@1218 1328 | SqExp (e, f) =>
adamc@1218 1329 case expIn e of
adamc@1218 1330 inr p => Cond (Proj (oe, f), p)
adamc@1218 1331 | inl e => Reln (Eq, [Proj (oe, f), e])
adamc@1218 1332 in
adamc@1216 1333 And (p, p')
adamc@1218 1334 end)
adamc@1218 1335 True (#Select r)),
adamc@1218 1336 True, [])
adamc@1217 1337
adamc@1218 1338 val (rvN, p, wp, outs) =
adamc@1217 1339 case #Select r of
adamc@1217 1340 [SqExp (Binop (Exps bo, Count, SqConst (Prim.Int 0)), f)] =>
adamc@1217 1341 (case bo (Const (Prim.Int 1), Const (Prim.Int 2)) of
adamc@1217 1342 Reln (Gt, [Const (Prim.Int 1), Const (Prim.Int 2)]) =>
adamc@1218 1343 (case oe of
adamc@1218 1344 SomeCol =>
adamc@1218 1345 let
adamc@1218 1346 val (rvN, oe) = rv rvN
adamc@1218 1347 in
adamc@1218 1348 (rvN,
adamc@1218 1349 Or (Reln (Eq, [oe, Func (DtCon0 "Basis.bool.False", [])]),
adamc@1218 1350 And (Reln (Eq, [oe, Func (DtCon0 "Basis.bool.True", [])]),
adamc@1218 1351 p)),
adamc@1218 1352 Reln (Eq, [oe, Func (DtCon0 "Basis.bool.True", [])]),
adamc@1218 1353 [oe])
adamc@1218 1354 end
adamc@1218 1355 | AllCols oe =>
adamc@1218 1356 let
adamc@1218 1357 val oe = Proj (oe, f)
adamc@1218 1358 in
adamc@1218 1359 (rvN,
adamc@1218 1360 Or (Reln (Eq, [oe, Func (DtCon0 "Basis.bool.False", [])]),
adamc@1218 1361 And (Reln (Eq, [oe, Func (DtCon0 "Basis.bool.True", [])]),
adamc@1218 1362 p)),
adamc@1218 1363 Reln (Eq, [oe, Func (DtCon0 "Basis.bool.True", [])]),
adamc@1218 1364 [])
adamc@1218 1365 end)
adamc@1217 1366 | _ => normal ())
adamc@1217 1367 | _ => normal ()
adamc@1216 1368 in
adamc@1217 1369 (rvN, p, wp, case #Where r of
adamc@1217 1370 NONE => []
adamc@1218 1371 | SOME e => map (fn (v, f) => Proj (rvOf v, f)) (usedFields e), outs)
adamc@1216 1372 end
adamc@1216 1373 handle Default => default ()
adamc@1216 1374 end
adamc@1200 1375
adamc@1211 1376 fun evalPat env e (pt, _) =
adamc@1211 1377 case pt of
adamc@1211 1378 PWild => (env, True)
adamc@1211 1379 | PVar _ => (e :: env, True)
adamc@1211 1380 | PPrim _ => (env, True)
adamc@1215 1381 | PCon (_, pc, NONE) => (env, Reln (PCon0 (patCon pc), [e]))
adamc@1211 1382 | PCon (_, pc, SOME pt) =>
adamc@1211 1383 let
adamc@1215 1384 val (env, p) = evalPat env (Func (UnCon (patCon pc), [e])) pt
adamc@1211 1385 in
adamc@1215 1386 (env, And (p, Reln (PCon1 (patCon pc), [e])))
adamc@1211 1387 end
adamc@1211 1388 | PRecord xpts =>
adamc@1211 1389 foldl (fn ((x, pt, _), (env, p)) =>
adamc@1211 1390 let
adamc@1211 1391 val (env, p') = evalPat env (Proj (e, x)) pt
adamc@1211 1392 in
adamc@1211 1393 (env, And (p', p))
adamc@1211 1394 end) (env, True) xpts
adamc@1215 1395 | PNone _ => (env, Reln (PCon0 "None", [e]))
adamc@1211 1396 | PSome (_, pt) =>
adamc@1211 1397 let
adamc@1215 1398 val (env, p) = evalPat env (Func (UnCon "Some", [e])) pt
adamc@1211 1399 in
adamc@1215 1400 (env, And (p, Reln (PCon1 "Some", [e])))
adamc@1211 1401 end
adamc@1211 1402
adamc@1211 1403 fun peq (p1, p2) =
adamc@1211 1404 case (p1, p2) of
adamc@1211 1405 (True, True) => true
adamc@1211 1406 | (False, False) => true
adamc@1211 1407 | (Unknown, Unknown) => true
adamc@1211 1408 | (And (x1, y1), And (x2, y2)) => peq (x1, x2) andalso peq (y1, y2)
adamc@1211 1409 | (Or (x1, y1), Or (x2, y2)) => peq (x1, x2) andalso peq (y1, y2)
adamc@1211 1410 | (Reln (r1, es1), Reln (r2, es2)) => r1 = r2 andalso ListPair.allEq eeq (es1, es2)
adamc@1212 1411 | (Cond (e1, p1), Cond (e2, p2)) => eeq (e1, e2) andalso peq (p1, p2)
adamc@1211 1412 | _ => false
adamc@1211 1413
adamc@1211 1414 fun removeRedundant p1 =
adamc@1211 1415 let
adamc@1211 1416 fun rr p2 =
adamc@1211 1417 if peq (p1, p2) then
adamc@1211 1418 True
adamc@1211 1419 else
adamc@1211 1420 case p2 of
adamc@1211 1421 And (x, y) => And (rr x, rr y)
adamc@1211 1422 | Or (x, y) => Or (rr x, rr y)
adamc@1211 1423 | _ => p2
adamc@1211 1424 in
adamc@1211 1425 rr
adamc@1211 1426 end
adamc@1211 1427
adamc@1218 1428 datatype cflow = Case | Where
adamc@1218 1429 datatype flow = Data | Control of cflow
adamc@1218 1430 type check = ErrorMsg.span * exp * prop
adamc@1218 1431
adamc@1217 1432 structure St :> sig
adamc@1217 1433 type t
adamc@1217 1434 val create : {Var : int,
adamc@1217 1435 Ambient : prop} -> t
adamc@1217 1436
adamc@1217 1437 val curVar : t -> int
adamc@1217 1438 val nextVar : t -> t * int
adamc@1217 1439
adamc@1217 1440 val ambient : t -> prop
adamc@1217 1441 val setAmbient : t * prop -> t
adamc@1217 1442
adamc@1218 1443 val paths : t -> (check * cflow) list
adamc@1218 1444 val addPath : t * (check * cflow) -> t
adamc@1218 1445 val addPaths : t * (check * cflow) list -> t
adamc@1218 1446 val clearPaths : t -> t
adamc@1218 1447 val setPaths : t * (check * cflow) list -> t
adamc@1217 1448
adamc@1218 1449 val sent : t -> (check * flow) list
adamc@1218 1450 val addSent : t * (check * flow) -> t
adamc@1218 1451 val setSent : t * (check * flow) list -> t
adamc@1217 1452 end = struct
adamc@1217 1453
adamc@1217 1454 type t = {Var : int,
adamc@1217 1455 Ambient : prop,
adamc@1218 1456 Path : (check * cflow) list,
adamc@1218 1457 Sent : (check * flow) list}
adamc@1217 1458
adamc@1217 1459 fun create {Var = v, Ambient = p} = {Var = v,
adamc@1217 1460 Ambient = p,
adamc@1217 1461 Path = [],
adamc@1217 1462 Sent = []}
adamc@1217 1463
adamc@1217 1464 fun curVar (t : t) = #Var t
adamc@1217 1465 fun nextVar (t : t) = ({Var = #Var t + 1,
adamc@1217 1466 Ambient = #Ambient t,
adamc@1217 1467 Path = #Path t,
adamc@1217 1468 Sent = #Sent t}, #Var t)
adamc@1217 1469
adamc@1217 1470 fun ambient (t : t) = #Ambient t
adamc@1217 1471 fun setAmbient (t : t, p) = {Var = #Var t,
adamc@1217 1472 Ambient = p,
adamc@1217 1473 Path = #Path t,
adamc@1217 1474 Sent = #Sent t}
adamc@1217 1475
adamc@1218 1476 fun paths (t : t) = #Path t
adamc@1217 1477 fun addPath (t : t, c) = {Var = #Var t,
adamc@1217 1478 Ambient = #Ambient t,
adamc@1217 1479 Path = c :: #Path t,
adamc@1217 1480 Sent = #Sent t}
adamc@1218 1481 fun addPaths (t : t, cs) = {Var = #Var t,
adamc@1218 1482 Ambient = #Ambient t,
adamc@1218 1483 Path = cs @ #Path t,
adamc@1218 1484 Sent = #Sent t}
adamc@1218 1485 fun clearPaths (t : t) = {Var = #Var t,
adamc@1218 1486 Ambient = #Ambient t,
adamc@1218 1487 Path = [],
adamc@1218 1488 Sent = #Sent t}
adamc@1218 1489 fun setPaths (t : t, cs) = {Var = #Var t,
adamc@1218 1490 Ambient = #Ambient t,
adamc@1218 1491 Path = cs,
adamc@1218 1492 Sent = #Sent t}
adamc@1217 1493
adamc@1217 1494 fun sent (t : t) = #Sent t
adamc@1217 1495 fun addSent (t : t, c) = {Var = #Var t,
adamc@1217 1496 Ambient = #Ambient t,
adamc@1217 1497 Path = #Path t,
adamc@1217 1498 Sent = c :: #Sent t}
adamc@1217 1499 fun setSent (t : t, cs) = {Var = #Var t,
adamc@1217 1500 Ambient = #Ambient t,
adamc@1217 1501 Path = #Path t,
adamc@1217 1502 Sent = cs}
adamc@1217 1503
adamc@1217 1504 end
adamc@1217 1505
adamc@1217 1506 fun evalExp env (e as (_, loc), st) =
adamc@1200 1507 let
adamc@1200 1508 fun default () =
adamc@1217 1509 let
adamc@1217 1510 val (st, nv) = St.nextVar st
adamc@1217 1511 in
adamc@1217 1512 (Var nv, st)
adamc@1217 1513 end
adamc@1200 1514
adamc@1217 1515 fun addSent (p, e, st) =
adamc@1218 1516 let
adamc@1218 1517 val st = if isKnown e then
adamc@1218 1518 st
adamc@1218 1519 else
adamc@1218 1520 St.addSent (st, ((loc, e, p), Data))
adamc@1218 1521
adamc@1218 1522 val st = foldl (fn ((c, fl), st) => St.addSent (st, (c, Control fl))) st (St.paths st)
adamc@1218 1523 in
adamc@1218 1524 St.clearPaths st
adamc@1218 1525 end
adamc@1200 1526 in
adamc@1200 1527 case #1 e of
adamc@1200 1528 EPrim p => (Const p, st)
adamc@1200 1529 | ERel n => (List.nth (env, n), st)
adamc@1200 1530 | ENamed _ => default ()
adamc@1215 1531 | ECon (_, pc, NONE) => (Func (DtCon0 (patCon pc), []), st)
adamc@1200 1532 | ECon (_, pc, SOME e) =>
adamc@1200 1533 let
adamc@1200 1534 val (e, st) = evalExp env (e, st)
adamc@1200 1535 in
adamc@1215 1536 (Func (DtCon1 (patCon pc), [e]), st)
adamc@1200 1537 end
adamc@1215 1538 | ENone _ => (Func (DtCon0 "None", []), st)
adamc@1200 1539 | ESome (_, e) =>
adamc@1200 1540 let
adamc@1200 1541 val (e, st) = evalExp env (e, st)
adamc@1200 1542 in
adamc@1215 1543 (Func (DtCon1 "Some", [e]), st)
adamc@1200 1544 end
adamc@1200 1545 | EFfi _ => default ()
adamc@1213 1546
adamc@1200 1547 | EFfiApp (m, s, es) =>
adamc@1200 1548 if m = "Basis" andalso SS.member (writers, s) then
adamc@1200 1549 let
adamc@1200 1550 val (es, st) = ListUtil.foldlMap (evalExp env) st es
adamc@1200 1551 in
adamc@1217 1552 (Recd [], foldl (fn (e, st) => addSent (St.ambient st, e, st)) st es)
adamc@1200 1553 end
adamc@1200 1554 else if Settings.isEffectful (m, s) andalso not (Settings.isBenignEffectful (m, s)) then
adamc@1200 1555 default ()
adamc@1200 1556 else
adamc@1200 1557 let
adamc@1200 1558 val (es, st) = ListUtil.foldlMap (evalExp env) st es
adamc@1200 1559 in
adamc@1215 1560 (Func (Other (m ^ "." ^ s), es), st)
adamc@1200 1561 end
adamc@1213 1562
adamc@1213 1563 | EApp (e1, e2) =>
adamc@1213 1564 let
adamc@1213 1565 val (e1, st) = evalExp env (e1, st)
adamc@1213 1566 in
adamc@1213 1567 case e1 of
adamc@1213 1568 Finish => (Finish, st)
adamc@1213 1569 | _ => default ()
adamc@1213 1570 end
adamc@1213 1571
adamc@1200 1572 | EAbs _ => default ()
adamc@1200 1573 | EUnop (s, e1) =>
adamc@1200 1574 let
adamc@1200 1575 val (e1, st) = evalExp env (e1, st)
adamc@1200 1576 in
adamc@1215 1577 (Func (Other s, [e1]), st)
adamc@1200 1578 end
adamc@1200 1579 | EBinop (s, e1, e2) =>
adamc@1200 1580 let
adamc@1200 1581 val (e1, st) = evalExp env (e1, st)
adamc@1200 1582 val (e2, st) = evalExp env (e2, st)
adamc@1200 1583 in
adamc@1215 1584 (Func (Other s, [e1, e2]), st)
adamc@1200 1585 end
adamc@1200 1586 | ERecord xets =>
adamc@1200 1587 let
adamc@1200 1588 val (xes, st) = ListUtil.foldlMap (fn ((x, e, _), st) =>
adamc@1200 1589 let
adamc@1200 1590 val (e, st) = evalExp env (e, st)
adamc@1200 1591 in
adamc@1200 1592 ((x, e), st)
adamc@1200 1593 end) st xets
adamc@1200 1594 in
adamc@1200 1595 (Recd xes, st)
adamc@1200 1596 end
adamc@1200 1597 | EField (e, s) =>
adamc@1200 1598 let
adamc@1200 1599 val (e, st) = evalExp env (e, st)
adamc@1200 1600 in
adamc@1200 1601 (Proj (e, s), st)
adamc@1200 1602 end
adamc@1218 1603 | ECase (e, pes, {result = res, ...}) =>
adamc@1211 1604 let
adamc@1211 1605 val (e, st) = evalExp env (e, st)
adamc@1217 1606 val (st, r) = St.nextVar st
adamc@1217 1607 val orig = St.ambient st
adamc@1218 1608 val origPaths = St.paths st
adamc@1211 1609
adamc@1218 1610 val st = St.addPath (st, ((loc, e, orig), Case))
adamc@1218 1611
adamc@1218 1612 val (st, paths) =
adamc@1218 1613 foldl (fn ((pt, pe), (st, paths)) =>
adamc@1218 1614 let
adamc@1218 1615 val (env, pp) = evalPat env e pt
adamc@1218 1616 val (pe, st') = evalExp env (pe, St.setAmbient (st, And (orig, pp)))
adamc@1218 1617
adamc@1218 1618 val this = And (removeRedundant orig (St.ambient st'),
adamc@1218 1619 Reln (Eq, [Var r, pe]))
adamc@1218 1620 in
adamc@1218 1621 (St.setPaths (St.setAmbient (st', Or (St.ambient st, this)), origPaths),
adamc@1218 1622 St.paths st' @ paths)
adamc@1218 1623 end) (St.setAmbient (st, False), []) pes
adamc@1218 1624
adamc@1218 1625 val st = case #1 res of
adamc@1218 1626 TRecord [] => St.setPaths (st, origPaths)
adamc@1218 1627 | _ => St.setPaths (st, paths)
adamc@1211 1628 in
adamc@1217 1629 (Var r, St.setAmbient (st, And (orig, St.ambient st)))
adamc@1211 1630 end
adamc@1200 1631 | EStrcat (e1, e2) =>
adamc@1200 1632 let
adamc@1200 1633 val (e1, st) = evalExp env (e1, st)
adamc@1200 1634 val (e2, st) = evalExp env (e2, st)
adamc@1200 1635 in
adamc@1215 1636 (Func (Other "cat", [e1, e2]), st)
adamc@1200 1637 end
adamc@1200 1638 | EError _ => (Finish, st)
adamc@1200 1639 | EReturnBlob {blob = b, mimeType = m, ...} =>
adamc@1200 1640 let
adamc@1200 1641 val (b, st) = evalExp env (b, st)
adamc@1200 1642 val (m, st) = evalExp env (m, st)
adamc@1200 1643 in
adamc@1217 1644 (Finish, addSent (St.ambient st, b, addSent (St.ambient st, m, st)))
adamc@1200 1645 end
adamc@1200 1646 | ERedirect (e, _) =>
adamc@1200 1647 let
adamc@1200 1648 val (e, st) = evalExp env (e, st)
adamc@1200 1649 in
adamc@1217 1650 (Finish, addSent (St.ambient st, e, st))
adamc@1200 1651 end
adamc@1200 1652 | EWrite e =>
adamc@1200 1653 let
adamc@1200 1654 val (e, st) = evalExp env (e, st)
adamc@1200 1655 in
adamc@1217 1656 (Recd [], addSent (St.ambient st, e, st))
adamc@1200 1657 end
adamc@1200 1658 | ESeq (e1, e2) =>
adamc@1200 1659 let
adamc@1200 1660 val (_, st) = evalExp env (e1, st)
adamc@1200 1661 in
adamc@1200 1662 evalExp env (e2, st)
adamc@1200 1663 end
adamc@1200 1664 | ELet (_, _, e1, e2) =>
adamc@1200 1665 let
adamc@1200 1666 val (e1, st) = evalExp env (e1, st)
adamc@1200 1667 in
adamc@1200 1668 evalExp (e1 :: env) (e2, st)
adamc@1200 1669 end
adamc@1200 1670 | EClosure (n, es) =>
adamc@1200 1671 let
adamc@1200 1672 val (es, st) = ListUtil.foldlMap (evalExp env) st es
adamc@1200 1673 in
adamc@1215 1674 (Func (Other ("Cl" ^ Int.toString n), es), st)
adamc@1200 1675 end
adamc@1200 1676
adamc@1200 1677 | EQuery {query = q, body = b, initial = i, ...} =>
adamc@1200 1678 let
adamc@1200 1679 val (_, st) = evalExp env (q, st)
adamc@1200 1680 val (i, st) = evalExp env (i, st)
adamc@1200 1681
adamc@1217 1682 val (st', r) = St.nextVar st
adamc@1217 1683 val (st', acc) = St.nextVar st'
adamc@1200 1684
adamc@1200 1685 val (b, st') = evalExp (Var acc :: Var r :: env) (b, st')
adamc@1200 1686
adamc@1218 1687 val (st', qp, qwp, used, _) =
adamc@1214 1688 queryProp env
adamc@1217 1689 st' (fn st' =>
adamc@1217 1690 let
adamc@1217 1691 val (st', rv) = St.nextVar st'
adamc@1217 1692 in
adamc@1217 1693 (st', Var rv)
adamc@1217 1694 end)
adamc@1214 1695 (AllCols (Var r)) q
adamc@1200 1696
adamc@1217 1697 val p' = And (qp, St.ambient st')
adamc@1200 1698
adamc@1217 1699 val (st, res) = if varInP acc (St.ambient st') then
adamc@1217 1700 let
adamc@1217 1701 val (st, r) = St.nextVar st
adamc@1217 1702 in
adamc@1217 1703 (st, Var r)
adamc@1217 1704 end
adamc@1217 1705 else
adamc@1217 1706 let
adamc@1217 1707 val (st, out) = St.nextVar st'
adamc@1217 1708
adamc@1217 1709 val p = Or (Reln (Eq, [Var out, i]),
adamc@1217 1710 And (Reln (Eq, [Var out, b]),
adamc@1217 1711 p'))
adamc@1217 1712 in
adamc@1217 1713 (St.setAmbient (st, p), Var out)
adamc@1217 1714 end
adamc@1210 1715
adamc@1218 1716 val sent = map (fn ((loc, e, p), fl) => ((loc, e, And (qp, p)), fl)) (St.sent st')
adamc@1212 1717
adamc@1217 1718 val p' = And (p', qwp)
adamc@1218 1719 val paths = map (fn e => ((loc, e, p'), Where)) used
adamc@1200 1720 in
adamc@1218 1721 (res, St.addPaths (St.setSent (st, sent), paths))
adamc@1200 1722 end
adamc@1200 1723 | EDml _ => default ()
adamc@1200 1724 | ENextval _ => default ()
adamc@1200 1725 | ESetval _ => default ()
adamc@1200 1726
adamc@1213 1727 | EUnurlify ((EFfiApp ("Basis", "get_cookie", _), _), _, _) =>
adamc@1217 1728 let
adamc@1217 1729 val (st, nv) = St.nextVar st
adamc@1217 1730 in
adamc@1217 1731 (Var nv, St.setAmbient (st, And (St.ambient st, Reln (Known, [Var nv]))))
adamc@1217 1732 end
adamc@1213 1733
adamc@1200 1734 | EUnurlify _ => default ()
adamc@1200 1735 | EJavaScript _ => default ()
adamc@1200 1736 | ESignalReturn _ => default ()
adamc@1200 1737 | ESignalBind _ => default ()
adamc@1200 1738 | ESignalSource _ => default ()
adamc@1200 1739 | EServerCall _ => default ()
adamc@1200 1740 | ERecv _ => default ()
adamc@1200 1741 | ESleep _ => default ()
adamc@1200 1742 | ESpawn _ => default ()
adamc@1200 1743 end
adamc@1200 1744
adamc@1200 1745 fun check file =
adamc@1200 1746 let
adamc@1213 1747 val file = MonoReduce.reduce file
adamc@1213 1748 val file = MonoOpt.optimize file
adamc@1213 1749 val file = Fuse.fuse file
adamc@1213 1750 val file = MonoOpt.optimize file
adamc@1216 1751 val file = MonoShake.shake file
adamc@1213 1752 (*val () = Print.preface ("File", MonoPrint.p_file MonoEnv.empty file)*)
adamc@1213 1753
adamc@1207 1754 val exptd = foldl (fn ((d, _), exptd) =>
adamc@1207 1755 case d of
adamc@1207 1756 DExport (_, _, n, _, _, _) => IS.add (exptd, n)
adamc@1207 1757 | _ => exptd) IS.empty file
adamc@1207 1758
adamc@1202 1759 fun decl ((d, _), (vals, pols)) =
adamc@1200 1760 case d of
adamc@1207 1761 DVal (_, n, _, e, _) =>
adamc@1200 1762 let
adamc@1207 1763 val isExptd = IS.member (exptd, n)
adamc@1207 1764
adamc@1207 1765 fun deAbs (e, env, nv, p) =
adamc@1200 1766 case #1 e of
adamc@1207 1767 EAbs (_, _, _, e) => deAbs (e, Var nv :: env, nv + 1,
adamc@1207 1768 if isExptd then
adamc@1207 1769 And (p, Reln (Known, [Var nv]))
adamc@1207 1770 else
adamc@1207 1771 p)
adamc@1207 1772 | _ => (e, env, nv, p)
adamc@1200 1773
adamc@1207 1774 val (e, env, nv, p) = deAbs (e, [], 1, True)
adamc@1200 1775
adamc@1217 1776 val (_, st) = evalExp env (e, St.create {Var = nv,
adamc@1217 1777 Ambient = p})
adamc@1200 1778 in
adamc@1217 1779 (St.sent st @ vals, pols)
adamc@1200 1780 end
adamc@1202 1781
adamc@1218 1782 | DPolicy (PolClient e) =>
adamc@1218 1783 let
adamc@1218 1784 val (_, p, _, _, outs) = queryProp [] 0 (fn rvN => (rvN + 1, Lvar rvN)) SomeCol e
adamc@1218 1785 in
adamc@1218 1786 (vals, (p, outs) :: pols)
adamc@1218 1787 end
adamc@1214 1788
adamc@1202 1789 | _ => (vals, pols)
adamc@1202 1790
adamc@1203 1791 val () = reset ()
adamc@1202 1792
adamc@1202 1793 val (vals, pols) = foldl decl ([], []) file
adamc@1200 1794 in
adamc@1218 1795 app (fn ((loc, e, p), fl) =>
adamc@1207 1796 let
adamc@1213 1797 fun doOne e =
adamc@1213 1798 let
adamc@1213 1799 val p = And (p, Reln (Eq, [Var 0, e]))
adamc@1213 1800 in
adamc@1218 1801 if decomp true (fn (e1, e2) => e1 andalso e2 ()) p
adamc@1218 1802 (fn hyps =>
adamc@1218 1803 (fl <> Control Where
adamc@1218 1804 andalso imply (hyps, [AReln (Known, [Var 0])], [Var 0]))
adamc@1218 1805 orelse List.exists (fn (p', outs) =>
adamc@1218 1806 decomp false (fn (e1, e2) => e1 orelse e2 ()) p'
adamc@1218 1807 (fn goals => imply (hyps, goals, outs)))
adamc@1218 1808 pols) then
adamc@1213 1809 ()
adamc@1213 1810 else
adamc@1213 1811 (ErrorMsg.errorAt loc "The information flow policy may be violated here.";
adamc@1216 1812 Print.preface ("The state satisifies this predicate:", p_prop p))
adamc@1213 1813 end
adamc@1213 1814
adamc@1213 1815 fun doAll e =
adamc@1213 1816 case e of
adamc@1213 1817 Const _ => ()
adamc@1213 1818 | Var _ => doOne e
adamc@1213 1819 | Lvar _ => raise Fail "Iflow.doAll: Lvar"
adamc@1216 1820 | Func (UnCon _, [_]) => doOne e
adamc@1215 1821 | Func (_, es) => app doAll es
adamc@1213 1822 | Recd xes => app (doAll o #2) xes
adamc@1213 1823 | Proj _ => doOne e
adamc@1213 1824 | Finish => ()
adamc@1207 1825 in
adamc@1213 1826 doAll e
adamc@1207 1827 end) vals
adamc@1200 1828 end
adamc@1200 1829
adamc@1213 1830 val check = fn file =>
adamc@1213 1831 let
adamc@1213 1832 val oldInline = Settings.getMonoInline ()
adamc@1213 1833 in
adamc@1213 1834 (Settings.setMonoInline (case Int.maxInt of
adamc@1213 1835 NONE => 1000000
adamc@1213 1836 | SOME n => n);
adamc@1213 1837 check file;
adamc@1213 1838 Settings.setMonoInline oldInline)
adamc@1213 1839 handle ex => (Settings.setMonoInline oldInline;
adamc@1213 1840 raise ex)
adamc@1213 1841 end
adamc@1213 1842
adamc@1200 1843 end
adamc@1213 1844