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annotate src/sqlcache.sml @ 2267:e5b7b066bf1b

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Factor out SQL simplification.
author Ziv Scully <ziv@mit.edu>
date Wed, 14 Oct 2015 20:40:57 -0400
parents afd12c75e0d6
children bc1ef958d801
rev   line source
ziv@2250 1 structure Sqlcache :> SQLCACHE = struct
ziv@2209 2
ziv@2209 3 open Mono
ziv@2209 4
ziv@2209 5 structure IS = IntBinarySet
ziv@2209 6 structure IM = IntBinaryMap
ziv@2213 7 structure SK = struct type ord_key = string val compare = String.compare end
ziv@2213 8 structure SS = BinarySetFn(SK)
ziv@2213 9 structure SM = BinaryMapFn(SK)
ziv@2213 10 structure SIMM = MultimapFn(structure KeyMap = SM structure ValSet = IS)
ziv@2209 11
ziv@2250 12 fun iterate f n x = if n < 0
ziv@2250 13 then raise Fail "Can't iterate function negative number of times."
ziv@2250 14 else if n = 0
ziv@2250 15 then x
ziv@2250 16 else iterate f (n-1) (f x)
ziv@2250 17
ziv@2265 18 (* Filled in by [cacheWrap]. *)
ziv@2213 19 val ffiInfo : {index : int, params : int} list ref = ref []
ziv@2209 20
ziv@2227 21 fun resetFfiInfo () = ffiInfo := []
ziv@2227 22
ziv@2213 23 fun getFfiInfo () = !ffiInfo
ziv@2213 24
ziv@2215 25 (* Some FFIs have writing as their only effect, which the caching records. *)
ziv@2215 26 val ffiEffectful =
ziv@2223 27 (* ASK: how can this be less hard-coded? *)
ziv@2215 28 let
ziv@2258 29 val okayWrites = SS.fromList ["htmlifyInt_w",
ziv@2258 30 "htmlifyFloat_w",
ziv@2258 31 "htmlifyString_w",
ziv@2258 32 "htmlifyBool_w",
ziv@2258 33 "htmlifyTime_w",
ziv@2258 34 "attrifyInt_w",
ziv@2258 35 "attrifyFloat_w",
ziv@2258 36 "attrifyString_w",
ziv@2258 37 "attrifyChar_w",
ziv@2258 38 "urlifyInt_w",
ziv@2258 39 "urlifyFloat_w",
ziv@2258 40 "urlifyString_w",
ziv@2258 41 "urlifyBool_w",
ziv@2258 42 "urlifyChannel_w"]
ziv@2215 43 in
ziv@2265 44 (* ASK: is it okay to hardcode Sqlcache functions as effectful? *)
ziv@2215 45 fn (m, f) => Settings.isEffectful (m, f)
ziv@2258 46 andalso not (m = "Basis" andalso SS.member (okayWrites, f))
ziv@2215 47 end
ziv@2215 48
ziv@2234 49 val cache = ref LruCache.cache
ziv@2233 50 fun setCache c = cache := c
ziv@2233 51 fun getCache () = !cache
ziv@2233 52
ziv@2248 53 (* Used to have type context for local variables in MonoUtil functions. *)
ziv@2248 54 val doBind =
ziv@2262 55 fn (env, MonoUtil.Exp.RelE (x, t)) => MonoEnv.pushERel env x t NONE
ziv@2262 56 | (env, MonoUtil.Exp.NamedE (x, n, t, eo, s)) => MonoEnv.pushENamed env x n t eo s
ziv@2262 57 | (env, MonoUtil.Exp.Datatype (x, n, cs)) => MonoEnv.pushDatatype env x n cs
ziv@2215 58
ziv@2266 59 (***********************)
ziv@2266 60 (* General Combinators *)
ziv@2266 61 (***********************)
ziv@2266 62
ziv@2266 63 (* From the MLton wiki. *)
ziv@2266 64 infix 3 <\ fun x <\ f = fn y => f (x, y) (* Left section *)
ziv@2266 65 infix 3 \> fun f \> y = f y (* Left application *)
ziv@2266 66 infixr 3 /> fun f /> y = fn x => f (x, y) (* Right section *)
ziv@2266 67 infixr 3 </ fun x </ f = f x (* Right application *)
ziv@2266 68
ziv@2266 69 (* Option monad. *)
ziv@2266 70 fun obind (x, f) = Option.mapPartial f x
ziv@2266 71 fun oguard (b, x) = if b then x else NONE
ziv@2248 72
ziv@2248 73 (*******************)
ziv@2248 74 (* Effect Analysis *)
ziv@2248 75 (*******************)
ziv@2215 76
ziv@2216 77 (* Makes an exception for [EWrite] (which is recorded when caching). *)
ziv@2248 78 fun effectful (effs : IS.set) =
ziv@2215 79 let
ziv@2248 80 val isFunction =
ziv@2248 81 fn (TFun _, _) => true
ziv@2248 82 | _ => false
ziv@2250 83 fun doExp (env, e) =
ziv@2248 84 case e of
ziv@2248 85 EPrim _ => false
ziv@2248 86 (* For now: variables of function type might be effectful, but
ziv@2248 87 others are fully evaluated and are therefore not effectful. *)
ziv@2250 88 | ERel n => isFunction (#2 (MonoEnv.lookupERel env n))
ziv@2248 89 | ENamed n => IS.member (effs, n)
ziv@2248 90 | EFfi (m, f) => ffiEffectful (m, f)
ziv@2248 91 | EFfiApp (m, f, _) => ffiEffectful (m, f)
ziv@2248 92 (* These aren't effectful unless a subexpression is. *)
ziv@2248 93 | ECon _ => false
ziv@2248 94 | ENone _ => false
ziv@2248 95 | ESome _ => false
ziv@2248 96 | EApp _ => false
ziv@2248 97 | EAbs _ => false
ziv@2248 98 | EUnop _ => false
ziv@2248 99 | EBinop _ => false
ziv@2248 100 | ERecord _ => false
ziv@2248 101 | EField _ => false
ziv@2248 102 | ECase _ => false
ziv@2248 103 | EStrcat _ => false
ziv@2248 104 (* EWrite is a special exception because we record writes when caching. *)
ziv@2248 105 | EWrite _ => false
ziv@2248 106 | ESeq _ => false
ziv@2248 107 | ELet _ => false
ziv@2250 108 | EUnurlify _ => false
ziv@2248 109 (* ASK: what should we do about closures? *)
ziv@2248 110 (* Everything else is some sort of effect. We could flip this and
ziv@2248 111 explicitly list bits of Mono that are effectful, but this is
ziv@2248 112 conservatively robust to future changes (however unlikely). *)
ziv@2248 113 | _ => true
ziv@2215 114 in
ziv@2248 115 MonoUtil.Exp.existsB {typ = fn _ => false, exp = doExp, bind = doBind}
ziv@2215 116 end
ziv@2215 117
ziv@2215 118 (* TODO: test this. *)
ziv@2252 119 fun effectfulDecls (decls, _) =
ziv@2215 120 let
ziv@2248 121 fun doVal ((_, name, _, e, _), effs) =
ziv@2250 122 if effectful effs MonoEnv.empty e
ziv@2248 123 then IS.add (effs, name)
ziv@2248 124 else effs
ziv@2215 125 val doDecl =
ziv@2248 126 fn ((DVal v, _), effs) => doVal (v, effs)
ziv@2248 127 (* Repeat the list of declarations a number of times equal to its size,
ziv@2248 128 making sure effectfulness propagates everywhere it should. This is
ziv@2248 129 analagous to the Bellman-Ford algorithm. *)
ziv@2248 130 | ((DValRec vs, _), effs) =>
ziv@2248 131 List.foldl doVal effs (List.concat (List.map (fn _ => vs) vs))
ziv@2215 132 (* ASK: any other cases? *)
ziv@2248 133 | (_, effs) => effs
ziv@2215 134 in
ziv@2248 135 List.foldl doDecl IS.empty decls
ziv@2215 136 end
ziv@2215 137
ziv@2215 138
ziv@2248 139 (*********************************)
ziv@2248 140 (* Boolean Formula Normalization *)
ziv@2248 141 (*********************************)
ziv@2216 142
ziv@2234 143 datatype junctionType = Conj | Disj
ziv@2216 144
ziv@2216 145 datatype 'atom formula =
ziv@2216 146 Atom of 'atom
ziv@2216 147 | Negate of 'atom formula
ziv@2234 148 | Combo of junctionType * 'atom formula list
ziv@2216 149
ziv@2243 150 (* Guaranteed to have all negation pushed to the atoms. *)
ziv@2243 151 datatype 'atom formula' =
ziv@2243 152 Atom' of 'atom
ziv@2243 153 | Combo' of junctionType * 'atom formula' list
ziv@2243 154
ziv@2234 155 val flipJt = fn Conj => Disj | Disj => Conj
ziv@2216 156
ziv@2236 157 fun concatMap f xs = List.concat (map f xs)
ziv@2216 158
ziv@2216 159 val rec cartesianProduct : 'a list list -> 'a list list =
ziv@2216 160 fn [] => [[]]
ziv@2236 161 | (xs :: xss) => concatMap (fn ys => concatMap (fn x => [x :: ys]) xs)
ziv@2236 162 (cartesianProduct xss)
ziv@2216 163
ziv@2218 164 (* Pushes all negation to the atoms.*)
ziv@2244 165 fun pushNegate (normalizeAtom : bool * 'atom -> 'atom) (negating : bool) =
ziv@2244 166 fn Atom x => Atom' (normalizeAtom (negating, x))
ziv@2244 167 | Negate f => pushNegate normalizeAtom (not negating) f
ziv@2244 168 | Combo (j, fs) => Combo' (if negating then flipJt j else j,
ziv@2244 169 map (pushNegate normalizeAtom negating) fs)
ziv@2218 170
ziv@2218 171 val rec flatten =
ziv@2243 172 fn Combo' (_, [f]) => flatten f
ziv@2243 173 | Combo' (j, fs) =>
ziv@2243 174 Combo' (j, List.foldr (fn (f, acc) =>
ziv@2243 175 case f of
ziv@2243 176 Combo' (j', fs') =>
ziv@2243 177 if j = j' orelse length fs' = 1
ziv@2243 178 then fs' @ acc
ziv@2243 179 else f :: acc
ziv@2243 180 | _ => f :: acc)
ziv@2243 181 []
ziv@2243 182 (map flatten fs))
ziv@2218 183 | f => f
ziv@2218 184
ziv@2243 185 (* [simplify] operates on the desired normal form. E.g., if [junc] is [Disj],
ziv@2243 186 consider the list of lists to be a disjunction of conjunctions. *)
ziv@2237 187 fun normalize' (simplify : 'a list list -> 'a list list)
ziv@2235 188 (junc : junctionType) =
ziv@2216 189 let
ziv@2235 190 fun norm junc =
ziv@2237 191 simplify
ziv@2243 192 o (fn Atom' x => [[x]]
ziv@2243 193 | Combo' (j, fs) =>
ziv@2235 194 let
ziv@2236 195 val fss = map (norm junc) fs
ziv@2235 196 in
ziv@2236 197 if j = junc
ziv@2236 198 then List.concat fss
ziv@2236 199 else map List.concat (cartesianProduct fss)
ziv@2235 200 end)
ziv@2216 201 in
ziv@2235 202 norm junc
ziv@2216 203 end
ziv@2216 204
ziv@2244 205 fun normalize simplify normalizeAtom junc =
ziv@2243 206 normalize' simplify junc
ziv@2235 207 o flatten
ziv@2244 208 o pushNegate normalizeAtom false
ziv@2216 209
ziv@2221 210 fun mapFormula mf =
ziv@2221 211 fn Atom x => Atom (mf x)
ziv@2221 212 | Negate f => Negate (mapFormula mf f)
ziv@2235 213 | Combo (j, fs) => Combo (j, map (mapFormula mf) fs)
ziv@2216 214
ziv@2230 215
ziv@2248 216 (****************)
ziv@2248 217 (* SQL Analysis *)
ziv@2248 218 (****************)
ziv@2213 219
ziv@2240 220 structure CmpKey = struct
ziv@2235 221
ziv@2235 222 type ord_key = Sql.cmp
ziv@2235 223
ziv@2235 224 val compare =
ziv@2235 225 fn (Sql.Eq, Sql.Eq) => EQUAL
ziv@2235 226 | (Sql.Eq, _) => LESS
ziv@2235 227 | (_, Sql.Eq) => GREATER
ziv@2235 228 | (Sql.Ne, Sql.Ne) => EQUAL
ziv@2235 229 | (Sql.Ne, _) => LESS
ziv@2235 230 | (_, Sql.Ne) => GREATER
ziv@2235 231 | (Sql.Lt, Sql.Lt) => EQUAL
ziv@2235 232 | (Sql.Lt, _) => LESS
ziv@2235 233 | (_, Sql.Lt) => GREATER
ziv@2235 234 | (Sql.Le, Sql.Le) => EQUAL
ziv@2235 235 | (Sql.Le, _) => LESS
ziv@2235 236 | (_, Sql.Le) => GREATER
ziv@2235 237 | (Sql.Gt, Sql.Gt) => EQUAL
ziv@2235 238 | (Sql.Gt, _) => LESS
ziv@2235 239 | (_, Sql.Gt) => GREATER
ziv@2235 240 | (Sql.Ge, Sql.Ge) => EQUAL
ziv@2235 241
ziv@2235 242 end
ziv@2235 243
ziv@2216 244 val rec chooseTwos : 'a list -> ('a * 'a) list =
ziv@2216 245 fn [] => []
ziv@2216 246 | x :: ys => map (fn y => (x, y)) ys @ chooseTwos ys
ziv@2213 247
ziv@2237 248 fun removeRedundant madeRedundantBy zs =
ziv@2237 249 let
ziv@2237 250 fun removeRedundant' (xs, ys) =
ziv@2237 251 case xs of
ziv@2237 252 [] => ys
ziv@2237 253 | x :: xs' =>
ziv@2237 254 removeRedundant' (xs',
ziv@2237 255 if List.exists (fn y => madeRedundantBy (x, y)) (xs' @ ys)
ziv@2237 256 then ys
ziv@2237 257 else x :: ys)
ziv@2237 258 in
ziv@2237 259 removeRedundant' (zs, [])
ziv@2237 260 end
ziv@2237 261
ziv@2216 262 datatype atomExp =
ziv@2216 263 QueryArg of int
ziv@2216 264 | DmlRel of int
ziv@2216 265 | Prim of Prim.t
ziv@2216 266 | Field of string * string
ziv@2216 267
ziv@2216 268 structure AtomExpKey : ORD_KEY = struct
ziv@2216 269
ziv@2234 270 type ord_key = atomExp
ziv@2216 271
ziv@2234 272 val compare =
ziv@2234 273 fn (QueryArg n1, QueryArg n2) => Int.compare (n1, n2)
ziv@2234 274 | (QueryArg _, _) => LESS
ziv@2234 275 | (_, QueryArg _) => GREATER
ziv@2234 276 | (DmlRel n1, DmlRel n2) => Int.compare (n1, n2)
ziv@2234 277 | (DmlRel _, _) => LESS
ziv@2234 278 | (_, DmlRel _) => GREATER
ziv@2234 279 | (Prim p1, Prim p2) => Prim.compare (p1, p2)
ziv@2234 280 | (Prim _, _) => LESS
ziv@2234 281 | (_, Prim _) => GREATER
ziv@2234 282 | (Field (t1, f1), Field (t2, f2)) =>
ziv@2234 283 case String.compare (t1, t2) of
ziv@2234 284 EQUAL => String.compare (f1, f2)
ziv@2234 285 | ord => ord
ziv@2216 286
ziv@2216 287 end
ziv@2216 288
ziv@2244 289 structure AtomOptionKey = OptionKeyFn(AtomExpKey)
ziv@2244 290
ziv@2216 291 structure UF = UnionFindFn(AtomExpKey)
ziv@2234 292
ziv@2235 293 structure ConflictMaps = struct
ziv@2235 294
ziv@2235 295 structure TK = TripleKeyFn(structure I = CmpKey
ziv@2244 296 structure J = AtomOptionKey
ziv@2244 297 structure K = AtomOptionKey)
ziv@2244 298 structure TS : ORD_SET = BinarySetFn(TK)
ziv@2235 299
ziv@2235 300 val toKnownEquality =
ziv@2235 301 (* [NONE] here means unkown. Anything that isn't a comparison between two
ziv@2235 302 knowns shouldn't be used, and simply dropping unused terms is okay in
ziv@2235 303 disjunctive normal form. *)
ziv@2235 304 fn (Sql.Eq, SOME e1, SOME e2) => SOME (e1, e2)
ziv@2235 305 | _ => NONE
ziv@2235 306
ziv@2235 307 val equivClasses : (Sql.cmp * atomExp option * atomExp option) list -> atomExp list list =
ziv@2235 308 UF.classes
ziv@2235 309 o List.foldl UF.union' UF.empty
ziv@2235 310 o List.mapPartial toKnownEquality
ziv@2235 311
ziv@2235 312 fun addToEqs (eqs, n, e) =
ziv@2235 313 case IM.find (eqs, n) of
ziv@2235 314 (* Comparing to a constant is probably better than comparing to a
ziv@2235 315 variable? Checking that existing constants match a new ones is
ziv@2235 316 handled by [accumulateEqs]. *)
ziv@2235 317 SOME (Prim _) => eqs
ziv@2235 318 | _ => IM.insert (eqs, n, e)
ziv@2235 319
ziv@2235 320 val accumulateEqs =
ziv@2235 321 (* [NONE] means we have a contradiction. *)
ziv@2235 322 fn (_, NONE) => NONE
ziv@2235 323 | ((Prim p1, Prim p2), eqso) =>
ziv@2235 324 (case Prim.compare (p1, p2) of
ziv@2235 325 EQUAL => eqso
ziv@2235 326 | _ => NONE)
ziv@2235 327 | ((QueryArg n, Prim p), SOME eqs) => SOME (addToEqs (eqs, n, Prim p))
ziv@2235 328 | ((QueryArg n, DmlRel r), SOME eqs) => SOME (addToEqs (eqs, n, DmlRel r))
ziv@2235 329 | ((Prim p, QueryArg n), SOME eqs) => SOME (addToEqs (eqs, n, Prim p))
ziv@2235 330 | ((DmlRel r, QueryArg n), SOME eqs) => SOME (addToEqs (eqs, n, DmlRel r))
ziv@2235 331 (* TODO: deal with equalities between [DmlRel]s and [Prim]s.
ziv@2235 332 This would involve guarding the invalidation with a check for the
ziv@2235 333 relevant comparisons. *)
ziv@2235 334 | (_, eqso) => eqso
ziv@2235 335
ziv@2235 336 val eqsOfClass : atomExp list -> atomExp IM.map option =
ziv@2235 337 List.foldl accumulateEqs (SOME IM.empty)
ziv@2235 338 o chooseTwos
ziv@2235 339
ziv@2235 340 fun toAtomExps rel (cmp, e1, e2) =
ziv@2235 341 let
ziv@2235 342 val qa =
ziv@2235 343 (* Here [NONE] means unkown. *)
ziv@2235 344 fn Sql.SqConst p => SOME (Prim p)
ziv@2235 345 | Sql.Field tf => SOME (Field tf)
ziv@2235 346 | Sql.Inj (EPrim p, _) => SOME (Prim p)
ziv@2235 347 | Sql.Inj (ERel n, _) => SOME (rel n)
ziv@2235 348 (* We can't deal with anything else, e.g., CURRENT_TIMESTAMP
ziv@2235 349 becomes Sql.Unmodeled, which becomes NONE here. *)
ziv@2235 350 | _ => NONE
ziv@2235 351 in
ziv@2235 352 (cmp, qa e1, qa e2)
ziv@2235 353 end
ziv@2235 354
ziv@2244 355 val negateCmp =
ziv@2244 356 fn Sql.Eq => Sql.Ne
ziv@2244 357 | Sql.Ne => Sql.Eq
ziv@2244 358 | Sql.Lt => Sql.Ge
ziv@2244 359 | Sql.Le => Sql.Gt
ziv@2244 360 | Sql.Gt => Sql.Le
ziv@2244 361 | Sql.Ge => Sql.Lt
ziv@2244 362
ziv@2244 363 fun normalizeAtom (negating, (cmp, e1, e2)) =
ziv@2244 364 (* Restricting to Le/Lt and sorting the expressions in Eq/Ne helps with
ziv@2244 365 simplification, where we put the triples in sets. *)
ziv@2244 366 case (if negating then negateCmp cmp else cmp) of
ziv@2244 367 Sql.Eq => (case AtomOptionKey.compare (e1, e2) of
ziv@2244 368 LESS => (Sql.Eq, e2, e1)
ziv@2244 369 | _ => (Sql.Eq, e1, e2))
ziv@2244 370 | Sql.Ne => (case AtomOptionKey.compare (e1, e2) of
ziv@2244 371 LESS => (Sql.Ne, e2, e1)
ziv@2244 372 | _ => (Sql.Ne, e1, e2))
ziv@2244 373 | Sql.Lt => (Sql.Lt, e1, e2)
ziv@2244 374 | Sql.Le => (Sql.Le, e1, e2)
ziv@2244 375 | Sql.Gt => (Sql.Lt, e2, e1)
ziv@2244 376 | Sql.Ge => (Sql.Le, e2, e1)
ziv@2235 377
ziv@2235 378 val markQuery : (Sql.cmp * Sql.sqexp * Sql.sqexp) formula ->
ziv@2235 379 (Sql.cmp * atomExp option * atomExp option) formula =
ziv@2235 380 mapFormula (toAtomExps QueryArg)
ziv@2235 381
ziv@2235 382 val markDml : (Sql.cmp * Sql.sqexp * Sql.sqexp) formula ->
ziv@2235 383 (Sql.cmp * atomExp option * atomExp option) formula =
ziv@2235 384 mapFormula (toAtomExps DmlRel)
ziv@2250 385
ziv@2235 386 (* No eqs should have key conflicts because no variable is in two
ziv@2235 387 equivalence classes, so the [#1] could be [#2]. *)
ziv@2235 388 val mergeEqs : (atomExp IntBinaryMap.map option list
ziv@2235 389 -> atomExp IntBinaryMap.map option) =
ziv@2235 390 List.foldr (fn (SOME eqs, SOME acc) => SOME (IM.unionWith #1 (eqs, acc)) | _ => NONE)
ziv@2235 391 (SOME IM.empty)
ziv@2235 392
ziv@2239 393 val simplify =
ziv@2239 394 map TS.listItems
ziv@2239 395 o removeRedundant (fn (x, y) => TS.isSubset (y, x))
ziv@2239 396 o map (fn xs => TS.addList (TS.empty, xs))
ziv@2239 397
ziv@2235 398 fun dnf (fQuery, fDml) =
ziv@2244 399 normalize simplify normalizeAtom Disj (Combo (Conj, [markQuery fQuery, markDml fDml]))
ziv@2235 400
ziv@2235 401 val conflictMaps = List.mapPartial (mergeEqs o map eqsOfClass o equivClasses) o dnf
ziv@2235 402
ziv@2235 403 end
ziv@2235 404
ziv@2235 405 val conflictMaps = ConflictMaps.conflictMaps
ziv@2213 406
ziv@2216 407 val rec sqexpToFormula =
ziv@2234 408 fn Sql.SqTrue => Combo (Conj, [])
ziv@2234 409 | Sql.SqFalse => Combo (Disj, [])
ziv@2216 410 | Sql.SqNot e => Negate (sqexpToFormula e)
ziv@2216 411 | Sql.Binop (Sql.RCmp c, e1, e2) => Atom (c, e1, e2)
ziv@2234 412 | Sql.Binop (Sql.RLop l, p1, p2) => Combo (case l of Sql.And => Conj | Sql.Or => Disj,
ziv@2216 413 [sqexpToFormula p1, sqexpToFormula p2])
ziv@2216 414 (* ASK: any other sqexps that can be props? *)
ziv@2216 415 | _ => raise Match
ziv@2213 416
ziv@2218 417 fun renameTables tablePairs =
ziv@2216 418 let
ziv@2216 419 fun renameString table =
ziv@2216 420 case List.find (fn (_, t) => table = t) tablePairs of
ziv@2216 421 NONE => table
ziv@2216 422 | SOME (realTable, _) => realTable
ziv@2216 423 val renameSqexp =
ziv@2216 424 fn Sql.Field (table, field) => Sql.Field (renameString table, field)
ziv@2216 425 | e => e
ziv@2218 426 fun renameAtom (cmp, e1, e2) = (cmp, renameSqexp e1, renameSqexp e2)
ziv@2216 427 in
ziv@2218 428 mapFormula renameAtom
ziv@2216 429 end
ziv@2218 430
ziv@2218 431 val rec queryToFormula =
ziv@2234 432 fn Sql.Query1 {Where = NONE, ...} => Combo (Conj, [])
ziv@2218 433 | Sql.Query1 {From = tablePairs, Where = SOME e, ...} =>
ziv@2218 434 renameTables tablePairs (sqexpToFormula e)
ziv@2234 435 | Sql.Union (q1, q2) => Combo (Disj, [queryToFormula q1, queryToFormula q2])
ziv@2216 436
ziv@2218 437 fun valsToFormula (table, vals) =
ziv@2234 438 Combo (Conj, map (fn (field, v) => Atom (Sql.Eq, Sql.Field (table, field), v)) vals)
ziv@2218 439
ziv@2216 440 val rec dmlToFormula =
ziv@2221 441 fn Sql.Insert (table, vals) => valsToFormula (table, vals)
ziv@2218 442 | Sql.Delete (table, wher) => renameTables [(table, "T")] (sqexpToFormula wher)
ziv@2218 443 | Sql.Update (table, vals, wher) =>
ziv@2218 444 let
ziv@2221 445 val fWhere = sqexpToFormula wher
ziv@2221 446 val fVals = valsToFormula (table, vals)
ziv@2237 447 val modifiedFields = SS.addList (SS.empty, map #1 vals)
ziv@2221 448 (* TODO: don't use field name hack. *)
ziv@2221 449 val markField =
ziv@2237 450 fn e as Sql.Field (t, v) => if SS.member (modifiedFields, v)
ziv@2237 451 then Sql.Field (t, v ^ "'")
ziv@2237 452 else e
ziv@2221 453 | e => e
ziv@2221 454 val mark = mapFormula (fn (cmp, e1, e2) => (cmp, markField e1, markField e2))
ziv@2218 455 in
ziv@2218 456 renameTables [(table, "T")]
ziv@2234 457 (Combo (Disj, [Combo (Conj, [fVals, mark fWhere]),
ziv@2244 458 Combo (Conj, [mark fVals, fWhere])]))
ziv@2218 459 end
ziv@2213 460
ziv@2213 461 val rec tablesQuery =
ziv@2216 462 fn Sql.Query1 {From = tablePairs, ...} => SS.fromList (map #1 tablePairs)
ziv@2216 463 | Sql.Union (q1, q2) => SS.union (tablesQuery q1, tablesQuery q2)
ziv@2213 464
ziv@2213 465 val tableDml =
ziv@2216 466 fn Sql.Insert (tab, _) => tab
ziv@2216 467 | Sql.Delete (tab, _) => tab
ziv@2216 468 | Sql.Update (tab, _, _) => tab
ziv@2213 469
ziv@2213 470
ziv@2265 471 (*************************************)
ziv@2265 472 (* Program Instrumentation Utilities *)
ziv@2265 473 (*************************************)
ziv@2213 474
ziv@2234 475 val varName =
ziv@2234 476 let
ziv@2234 477 val varNumber = ref 0
ziv@2234 478 in
ziv@2234 479 fn s => (varNumber := !varNumber + 1; s ^ Int.toString (!varNumber))
ziv@2234 480 end
ziv@2234 481
ziv@2233 482 val {check, store, flush, ...} = getCache ()
ziv@2233 483
ziv@2230 484 val dummyLoc = ErrorMsg.dummySpan
ziv@2216 485
ziv@2248 486 val dummyTyp = (TRecord [], dummyLoc)
ziv@2248 487
ziv@2230 488 fun stringExp s = (EPrim (Prim.String (Prim.Normal, s)), dummyLoc)
ziv@2230 489
ziv@2230 490 val stringTyp = (TFfi ("Basis", "string"), dummyLoc)
ziv@2213 491
ziv@2213 492 val sequence =
ziv@2213 493 fn (exp :: exps) =>
ziv@2213 494 let
ziv@2230 495 val loc = dummyLoc
ziv@2213 496 in
ziv@2213 497 List.foldl (fn (e', seq) => ESeq ((seq, loc), (e', loc))) exp exps
ziv@2213 498 end
ziv@2213 499 | _ => raise Match
ziv@2213 500
ziv@2248 501 (* Always increments negative indices as a hack we use later. *)
ziv@2248 502 fun incRels inc =
ziv@2215 503 MonoUtil.Exp.mapB
ziv@2248 504 {typ = fn t' => t',
ziv@2248 505 exp = fn bound =>
ziv@2248 506 (fn ERel n => ERel (if n >= bound orelse n < 0 then n + inc else n)
ziv@2248 507 | e' => e'),
ziv@2248 508 bind = fn (bound, MonoUtil.Exp.RelE _) => bound + 1 | (bound, _) => bound}
ziv@2248 509 0
ziv@2213 510
ziv@2262 511 fun fileTopLevelMapfoldB doTopLevelExp (decls, sideInfo) state =
ziv@2262 512 let
ziv@2262 513 fun doVal env ((x, n, t, exp, s), state) =
ziv@2262 514 let
ziv@2262 515 val (exp, state) = doTopLevelExp env exp state
ziv@2262 516 in
ziv@2262 517 ((x, n, t, exp, s), state)
ziv@2262 518 end
ziv@2262 519 fun doDecl' env (decl', state) =
ziv@2262 520 case decl' of
ziv@2262 521 DVal v =>
ziv@2262 522 let
ziv@2262 523 val (v, state) = doVal env (v, state)
ziv@2262 524 in
ziv@2262 525 (DVal v, state)
ziv@2262 526 end
ziv@2262 527 | DValRec vs =>
ziv@2262 528 let
ziv@2262 529 val (vs, state) = ListUtil.foldlMap (doVal env) state vs
ziv@2262 530 in
ziv@2262 531 (DValRec vs, state)
ziv@2262 532 end
ziv@2262 533 | _ => (decl', state)
ziv@2262 534 fun doDecl (decl as (decl', loc), (env, state)) =
ziv@2262 535 let
ziv@2262 536 val env = MonoEnv.declBinds env decl
ziv@2262 537 val (decl', state) = doDecl' env (decl', state)
ziv@2262 538 in
ziv@2262 539 ((decl', loc), (env, state))
ziv@2262 540 end
ziv@2262 541 val (decls, (_, state)) = (ListUtil.foldlMap doDecl (MonoEnv.empty, state) decls)
ziv@2262 542 in
ziv@2262 543 ((decls, sideInfo), state)
ziv@2262 544 end
ziv@2262 545
ziv@2262 546 fun fileAllMapfoldB doExp file start =
ziv@2248 547 case MonoUtil.File.mapfoldB
ziv@2248 548 {typ = Search.return2,
ziv@2250 549 exp = fn env => fn e' => fn s => Search.Continue (doExp env e' s),
ziv@2248 550 decl = fn _ => Search.return2,
ziv@2248 551 bind = doBind}
ziv@2250 552 MonoEnv.empty file start of
ziv@2213 553 Search.Continue x => x
ziv@2213 554 | Search.Return _ => raise Match
ziv@2213 555
ziv@2262 556 fun fileMap doExp file = #1 (fileAllMapfoldB (fn _ => fn e => fn _ => (doExp e, ())) file ())
ziv@2213 557
ziv@2267 558 (* TODO: make this a bit prettier.... *)
ziv@2267 559 val simplifySql =
ziv@2266 560 let
ziv@2267 561 fun factorOutNontrivial text =
ziv@2267 562 let
ziv@2267 563 val loc = dummyLoc
ziv@2267 564 fun strcat (e1, e2) = (EStrcat (e1, e2), loc)
ziv@2267 565 val chunks = Sql.chunkify text
ziv@2267 566 val (newText, newVariables) =
ziv@2267 567 (* Important that this is foldr (to oppose foldl below). *)
ziv@2267 568 List.foldr
ziv@2267 569 (fn (chunk, (qText, newVars)) =>
ziv@2267 570 (* Variable bound to the head of newVars will have the lowest index. *)
ziv@2267 571 case chunk of
ziv@2267 572 (* EPrim should always be a string in this case. *)
ziv@2267 573 Sql.Exp (e as (EPrim _, _)) => (strcat (e, qText), newVars)
ziv@2267 574 | Sql.Exp e =>
ziv@2267 575 let
ziv@2267 576 val n = length newVars
ziv@2267 577 in
ziv@2267 578 (* This is the (n+1)th new variable, so there are
ziv@2267 579 already n new variables bound, so we increment
ziv@2267 580 indices by n. *)
ziv@2267 581 (strcat ((ERel (~(n+1)), loc), qText), incRels n e :: newVars)
ziv@2267 582 end
ziv@2267 583 | Sql.String s => (strcat (stringExp s, qText), newVars))
ziv@2267 584 (stringExp "", [])
ziv@2267 585 chunks
ziv@2267 586 fun wrapLets e' =
ziv@2267 587 (* Important that this is foldl (to oppose foldr above). *)
ziv@2267 588 List.foldl (fn (v, e') => ELet (varName "sqlArg", stringTyp, v, (e', loc)))
ziv@2267 589 e'
ziv@2267 590 newVariables
ziv@2267 591 val numArgs = length newVariables
ziv@2267 592 in
ziv@2267 593 (newText, wrapLets, numArgs)
ziv@2267 594 end
ziv@2267 595 fun doExp exp' =
ziv@2267 596 let
ziv@2267 597 val text = case exp' of
ziv@2267 598 EQuery {query = text, ...} => text
ziv@2267 599 | EDml (text, _) => text
ziv@2267 600 | _ => raise Match
ziv@2267 601 val (newText, wrapLets, numArgs) = factorOutNontrivial text
ziv@2267 602 val newExp' = case exp' of
ziv@2267 603 EQuery q => EQuery {query = newText,
ziv@2267 604 exps = #exps q,
ziv@2267 605 tables = #tables q,
ziv@2267 606 state = #state q,
ziv@2267 607 body = #body q,
ziv@2267 608 initial = #initial q}
ziv@2267 609 | EDml (_, failureMode) => EDml (newText, failureMode)
ziv@2267 610 | _ => raise Match
ziv@2267 611 in
ziv@2267 612 (* Increment once for each new variable just made. This is
ziv@2267 613 where we use the negative De Bruijn indices hack. *)
ziv@2267 614 (* TODO: please don't use that hack. As anyone could have
ziv@2267 615 predicted, it was incomprehensible a year later.... *)
ziv@2267 616 wrapLets (#1 (incRels numArgs (newExp', dummyLoc)))
ziv@2267 617 end
ziv@2266 618 in
ziv@2267 619 fileMap (fn exp' => case exp' of
ziv@2267 620 EQuery _ => doExp exp'
ziv@2267 621 | EDml _ => doExp exp'
ziv@2267 622 | _ => exp')
ziv@2266 623 end
ziv@2266 624
ziv@2250 625
ziv@2250 626 (**********************)
ziv@2250 627 (* Mono Type Checking *)
ziv@2250 628 (**********************)
ziv@2250 629
ziv@2250 630 fun typOfExp' (env : MonoEnv.env) : exp' -> typ option =
ziv@2250 631 fn EPrim p => SOME (TFfi ("Basis", case p of
ziv@2250 632 Prim.Int _ => "int"
ziv@2250 633 | Prim.Float _ => "double"
ziv@2250 634 | Prim.String _ => "string"
ziv@2250 635 | Prim.Char _ => "char"),
ziv@2250 636 dummyLoc)
ziv@2250 637 | ERel n => SOME (#2 (MonoEnv.lookupERel env n))
ziv@2250 638 | ENamed n => SOME (#2 (MonoEnv.lookupENamed env n))
ziv@2250 639 (* ASK: okay to make a new [ref] each time? *)
ziv@2250 640 | ECon (dk, PConVar nCon, _) =>
ziv@2250 641 let
ziv@2250 642 val (_, _, nData) = MonoEnv.lookupConstructor env nCon
ziv@2250 643 val (_, cs) = MonoEnv.lookupDatatype env nData
ziv@2250 644 in
ziv@2250 645 SOME (TDatatype (nData, ref (dk, cs)), dummyLoc)
ziv@2250 646 end
ziv@2250 647 | ECon (_, PConFfi {mod = s, datatyp, ...}, _) => SOME (TFfi (s, datatyp), dummyLoc)
ziv@2250 648 | ENone t => SOME (TOption t, dummyLoc)
ziv@2250 649 | ESome (t, _) => SOME (TOption t, dummyLoc)
ziv@2250 650 | EFfi _ => NONE
ziv@2250 651 | EFfiApp _ => NONE
ziv@2250 652 | EApp (e1, e2) => (case typOfExp env e1 of
ziv@2250 653 SOME (TFun (_, t), _) => SOME t
ziv@2250 654 | _ => NONE)
ziv@2250 655 | EAbs (_, t1, t2, _) => SOME (TFun (t1, t2), dummyLoc)
ziv@2250 656 (* ASK: is this right? *)
ziv@2250 657 | EUnop (unop, e) => (case unop of
ziv@2250 658 "!" => SOME (TFfi ("Basis", "bool"), dummyLoc)
ziv@2250 659 | "-" => typOfExp env e
ziv@2250 660 | _ => NONE)
ziv@2250 661 (* ASK: how should this (and other "=> NONE" cases) work? *)
ziv@2250 662 | EBinop _ => NONE
ziv@2250 663 | ERecord fields => SOME (TRecord (map (fn (s, _, t) => (s, t)) fields), dummyLoc)
ziv@2250 664 | EField (e, s) => (case typOfExp env e of
ziv@2250 665 SOME (TRecord fields, _) =>
ziv@2250 666 (case List.find (fn (s', _) => s = s') fields of
ziv@2250 667 SOME (_, t) => SOME t
ziv@2250 668 | _ => NONE)
ziv@2250 669 | _ => NONE)
ziv@2250 670 | ECase (_, _, {result, ...}) => SOME result
ziv@2250 671 | EStrcat _ => SOME (TFfi ("Basis", "string"), dummyLoc)
ziv@2250 672 | EWrite _ => SOME (TRecord [], dummyLoc)
ziv@2250 673 | ESeq (_, e) => typOfExp env e
ziv@2250 674 | ELet (s, t, e1, e2) => typOfExp (MonoEnv.pushERel env s t (SOME e1)) e2
ziv@2250 675 | EClosure _ => NONE
ziv@2250 676 | EUnurlify (_, t, _) => SOME t
ziv@2256 677 | _ => NONE
ziv@2250 678
ziv@2250 679 and typOfExp env (e', loc) = typOfExp' env e'
ziv@2250 680
ziv@2250 681
ziv@2266 682 (***********)
ziv@2266 683 (* Caching *)
ziv@2266 684 (***********)
ziv@2250 685
ziv@2267 686 (*
ziv@2267 687
ziv@2267 688 To get the invalidations for a dml, we need (each <- is list-monad-y):
ziv@2267 689 * table <- dml
ziv@2267 690 * cache <- table
ziv@2267 691 * query <- cache
ziv@2267 692 * inval <- (query, dml),
ziv@2267 693 where inval is a list of query argument indices, so
ziv@2267 694 * way to change query args in inval to cache args.
ziv@2267 695 For now, the last one is just
ziv@2267 696 * a map from query arg number to the corresponding free variable (per query)
ziv@2267 697 * a map from free variable to cache arg number (per cache).
ziv@2267 698 Both queries and caches should have IDs.
ziv@2267 699
ziv@2267 700 *)
ziv@2267 701
ziv@2265 702 fun cacheWrap (env, exp, resultTyp, args, i) =
ziv@2265 703 let
ziv@2265 704 val loc = dummyLoc
ziv@2265 705 val rel0 = (ERel 0, loc)
ziv@2265 706 in
ziv@2265 707 case MonoFooify.urlify env (rel0, resultTyp) of
ziv@2265 708 NONE => NONE
ziv@2265 709 | SOME urlified =>
ziv@2265 710 let
ziv@2265 711 val () = ffiInfo := {index = i, params = length args} :: !ffiInfo
ziv@2265 712 (* We ensure before this step that all arguments aren't effectful.
ziv@2265 713 by turning them into local variables as needed. *)
ziv@2265 714 val argsInc = map (incRels 1) args
ziv@2265 715 val check = (check (i, args), loc)
ziv@2265 716 val store = (store (i, argsInc, urlified), loc)
ziv@2265 717 in
ziv@2265 718 SOME (ECase
ziv@2265 719 (check,
ziv@2265 720 [((PNone stringTyp, loc),
ziv@2265 721 (ELet (varName "q", resultTyp, exp, (ESeq (store, rel0), loc)), loc)),
ziv@2265 722 ((PSome (stringTyp, (PVar (varName "hit", stringTyp), loc)), loc),
ziv@2265 723 (* Boolean is false because we're not unurlifying from a cookie. *)
ziv@2265 724 (EUnurlify (rel0, resultTyp, false), loc))],
ziv@2265 725 {disc = (TOption stringTyp, loc), result = resultTyp}))
ziv@2265 726 end
ziv@2265 727 end
ziv@2265 728
ziv@2267 729 val maxFreeVar =
ziv@2267 730 MonoUtil.Exp.foldB
ziv@2267 731 {typ = #2,
ziv@2267 732 exp = fn (bound, ERel n, v) => Int.max (v, n - bound) | (_, _, v) => v,
ziv@2267 733 bind = fn (bound, MonoUtil.Exp.RelE _) => bound + 1 | (bound, _) => bound}
ziv@2267 734 0
ziv@2267 735 ~1
ziv@2267 736
ziv@2257 737 val freeVars =
ziv@2257 738 IS.listItems
ziv@2257 739 o MonoUtil.Exp.foldB
ziv@2257 740 {typ = #2,
ziv@2257 741 exp = fn (bound, ERel n, vars) => if n < bound
ziv@2257 742 then vars
ziv@2257 743 else IS.add (vars, n - bound)
ziv@2257 744 | (_, _, vars) => vars,
ziv@2257 745 bind = fn (bound, MonoUtil.Exp.RelE _) => bound + 1 | (bound, _) => bound}
ziv@2257 746 0
ziv@2257 747 IS.empty
ziv@2257 748
ziv@2258 749 val expSize = MonoUtil.Exp.fold {typ = #2, exp = fn (_, n) => n+1} 0
ziv@2258 750
ziv@2267 751 datatype subexp = Cachable of unit -> exp | Impure of exp
ziv@2250 752
ziv@2250 753 val isImpure =
ziv@2267 754 fn Cachable _ => false
ziv@2250 755 | Impure _ => true
ziv@2250 756
ziv@2250 757 val expOfSubexp =
ziv@2267 758 fn Cachable f => f ()
ziv@2250 759 | Impure e => e
ziv@2250 760
ziv@2259 761 (* TODO: pick a number. *)
ziv@2259 762 val sizeWorthCaching = 5
ziv@2259 763
ziv@2266 764 type state = (SIMM.multimap * (Sql.query * int) IntBinaryMap.map * int)
ziv@2266 765
ziv@2266 766 fun incIndex (x, y, index) = (x, y, index+1)
ziv@2266 767
ziv@2266 768 fun cacheQuery effs env (state as (tableToIndices, indexToQueryNumArgs, index)) =
ziv@2267 769 fn q as {query = queryText,
ziv@2267 770 state = resultTyp,
ziv@2267 771 initial, body, tables, exps} =>
ziv@2266 772 let
ziv@2267 773 val numArgs = maxFreeVar queryText + 1
ziv@2267 774 val queryExp = (EQuery q, dummyLoc)
ziv@2266 775 (* DEBUG *)
ziv@2266 776 (* val () = Print.preface ("sqlcache> ", MonoPrint.p_exp MonoEnv.empty queryText) *)
ziv@2266 777 val args = List.tabulate (numArgs, fn n => (ERel n, dummyLoc))
ziv@2266 778 (* We use dummyTyp here. I think this is okay because databases don't
ziv@2266 779 store (effectful) functions, but perhaps there's some pathalogical
ziv@2266 780 corner case missing.... *)
ziv@2266 781 fun safe bound =
ziv@2266 782 not
ziv@2266 783 o effectful effs
ziv@2266 784 (iterate (fn env => MonoEnv.pushERel env "_" dummyTyp NONE)
ziv@2266 785 bound
ziv@2266 786 env)
ziv@2266 787 val attempt =
ziv@2266 788 (* Ziv misses Haskell's do notation.... *)
ziv@2267 789 (safe 0 queryText andalso safe 0 initial andalso safe 2 body)
ziv@2267 790 <\oguard\>
ziv@2267 791 Sql.parse Sql.query queryText
ziv@2266 792 <\obind\>
ziv@2267 793 (fn queryParsed =>
ziv@2267 794 (cacheWrap (env, queryExp, resultTyp, args, index))
ziv@2266 795 <\obind\>
ziv@2267 796 (fn cachedExp =>
ziv@2267 797 SOME (cachedExp,
ziv@2267 798 (SS.foldr (fn (tab, qi) => SIMM.insert (qi, tab, index))
ziv@2267 799 tableToIndices
ziv@2267 800 (tablesQuery queryParsed),
ziv@2267 801 IM.insert (indexToQueryNumArgs, index, (queryParsed, numArgs)),
ziv@2267 802 index + 1))))
ziv@2266 803 in
ziv@2266 804 case attempt of
ziv@2266 805 SOME pair => pair
ziv@2266 806 (* Even in this case, we have to increment index to avoid some bug,
ziv@2266 807 but I forget exactly what it is or why this helps. *)
ziv@2266 808 (* TODO: just use a reference for current index.... *)
ziv@2266 809 | NONE => (EQuery q, incIndex state)
ziv@2266 810 end
ziv@2266 811
ziv@2266 812 fun cachePure (env, exp', (_, _, index)) =
ziv@2267 813 case (expSize (exp', dummyLoc) > sizeWorthCaching)
ziv@2267 814 </oguard/>
ziv@2267 815 typOfExp' env exp' of
ziv@2256 816 NONE => NONE
ziv@2256 817 | SOME (TFun _, _) => NONE
ziv@2256 818 | SOME typ =>
ziv@2267 819 (List.foldr (fn (_, NONE) => NONE
ziv@2267 820 | ((n, typ), SOME args) =>
ziv@2267 821 (MonoFooify.urlify env ((ERel n, dummyLoc), typ))
ziv@2267 822 </obind/>
ziv@2267 823 (fn arg => SOME (arg :: args)))
ziv@2267 824 (SOME [])
ziv@2267 825 (map (fn n => (n, #2 (MonoEnv.lookupERel env n)))
ziv@2267 826 (freeVars (exp', dummyLoc))))
ziv@2266 827 </obind/>
ziv@2266 828 (fn args => cacheWrap (env, (exp', dummyLoc), typ, args, index))
ziv@2250 829
ziv@2266 830 fun cache (effs : IS.set) ((env, exp as (exp', loc)), state) : subexp * state =
ziv@2250 831 let
ziv@2250 832 fun wrapBindN f (args : (MonoEnv.env * exp) list) =
ziv@2250 833 let
ziv@2266 834 val (subexps, state) = ListUtil.foldlMap (cache effs) state args
ziv@2256 835 fun mkExp () = (f (map expOfSubexp subexps), loc)
ziv@2250 836 in
ziv@2250 837 if List.exists isImpure subexps
ziv@2266 838 then (Impure (mkExp ()), state)
ziv@2267 839 else (Cachable (fn () => case cachePure (env, f (map #2 args), state) of
ziv@2267 840 NONE => mkExp ()
ziv@2267 841 | SOME e' => (e', loc)),
ziv@2256 842 (* Conservatively increment index. *)
ziv@2266 843 incIndex state)
ziv@2250 844 end
ziv@2250 845 fun wrapBind1 f arg =
ziv@2250 846 wrapBindN (fn [arg] => f arg | _ => raise Match) [arg]
ziv@2250 847 fun wrapBind2 f (arg1, arg2) =
ziv@2250 848 wrapBindN (fn [arg1, arg2] => f (arg1, arg2) | _ => raise Match) [arg1, arg2]
ziv@2250 849 fun wrapN f es = wrapBindN f (map (fn e => (env, e)) es)
ziv@2250 850 fun wrap1 f e = wrapBind1 f (env, e)
ziv@2250 851 fun wrap2 f (e1, e2) = wrapBind2 f ((env, e1), (env, e2))
ziv@2250 852 in
ziv@2250 853 case exp' of
ziv@2250 854 ECon (dk, pc, SOME e) => wrap1 (fn e => ECon (dk, pc, SOME e)) e
ziv@2250 855 | ESome (t, e) => wrap1 (fn e => ESome (t, e)) e
ziv@2250 856 | EFfiApp (s1, s2, args) =>
ziv@2258 857 if ffiEffectful (s1, s2)
ziv@2266 858 then (Impure exp, state)
ziv@2258 859 else wrapN (fn es =>
ziv@2258 860 EFfiApp (s1, s2, ListPair.map (fn (e, (_, t)) => (e, t)) (es, args)))
ziv@2258 861 (map #1 args)
ziv@2250 862 | EApp (e1, e2) => wrap2 EApp (e1, e2)
ziv@2250 863 | EAbs (s, t1, t2, e) =>
ziv@2250 864 wrapBind1 (fn e => EAbs (s, t1, t2, e))
ziv@2250 865 (MonoEnv.pushERel env s t1 NONE, e)
ziv@2250 866 | EUnop (s, e) => wrap1 (fn e => EUnop (s, e)) e
ziv@2250 867 | EBinop (bi, s, e1, e2) => wrap2 (fn (e1, e2) => EBinop (bi, s, e1, e2)) (e1, e2)
ziv@2250 868 | ERecord fields =>
ziv@2250 869 wrapN (fn es => ERecord (ListPair.map (fn (e, (s, _, t)) => (s, e, t)) (es, fields)))
ziv@2250 870 (map #2 fields)
ziv@2250 871 | EField (e, s) => wrap1 (fn e => EField (e, s)) e
ziv@2250 872 | ECase (e, cases, {disc, result}) =>
ziv@2250 873 wrapBindN (fn (e::es) =>
ziv@2250 874 ECase (e,
ziv@2250 875 (ListPair.map (fn (e, (p, _)) => (p, e)) (es, cases)),
ziv@2256 876 {disc = disc, result = result})
ziv@2256 877 | _ => raise Match)
ziv@2250 878 ((env, e) :: map (fn (p, e) => (MonoEnv.patBinds env p, e)) cases)
ziv@2250 879 | EStrcat (e1, e2) => wrap2 EStrcat (e1, e2)
ziv@2250 880 (* We record page writes, so they're cachable. *)
ziv@2250 881 | EWrite e => wrap1 EWrite e
ziv@2250 882 | ESeq (e1, e2) => wrap2 ESeq (e1, e2)
ziv@2250 883 | ELet (s, t, e1, e2) =>
ziv@2250 884 wrapBind2 (fn (e1, e2) => ELet (s, t, e1, e2))
ziv@2250 885 ((env, e1), (MonoEnv.pushERel env s t (SOME e1), e2))
ziv@2250 886 (* ASK: | EClosure (n, es) => ? *)
ziv@2250 887 | EUnurlify (e, t, b) => wrap1 (fn e => EUnurlify (e, t, b)) e
ziv@2266 888 | EQuery q =>
ziv@2266 889 let
ziv@2266 890 val (exp', state) = cacheQuery effs env state q
ziv@2266 891 in
ziv@2266 892 (Impure (exp', loc), state)
ziv@2266 893 end
ziv@2250 894 | _ => if effectful effs env exp
ziv@2266 895 then (Impure exp, state)
ziv@2267 896 else (Cachable (fn () => (case cachePure (env, exp', state) of
ziv@2267 897 NONE => exp'
ziv@2267 898 | SOME e' => e',
ziv@2267 899 loc)),
ziv@2266 900 incIndex state)
ziv@2256 901 end
ziv@2256 902
ziv@2266 903 fun addCaching file =
ziv@2256 904 let
ziv@2266 905 val effs = effectfulDecls file
ziv@2266 906 fun doTopLevelExp env exp state =
ziv@2256 907 let
ziv@2266 908 val (subexp, state) = cache effs ((env, exp), state)
ziv@2256 909 in
ziv@2266 910 (expOfSubexp subexp, state)
ziv@2256 911 end
ziv@2256 912 in
ziv@2266 913 ((fileTopLevelMapfoldB doTopLevelExp file (SIMM.empty, IM.empty, 0)), effs)
ziv@2265 914 end
ziv@2265 915
ziv@2265 916
ziv@2265 917 (************)
ziv@2265 918 (* Flushing *)
ziv@2265 919 (************)
ziv@2265 920
ziv@2265 921 structure Invalidations = struct
ziv@2265 922
ziv@2265 923 val loc = dummyLoc
ziv@2265 924
ziv@2265 925 val optionAtomExpToExp =
ziv@2265 926 fn NONE => (ENone stringTyp, loc)
ziv@2265 927 | SOME e => (ESome (stringTyp,
ziv@2265 928 (case e of
ziv@2265 929 DmlRel n => ERel n
ziv@2265 930 | Prim p => EPrim p
ziv@2265 931 (* TODO: make new type containing only these two. *)
ziv@2265 932 | _ => raise Match,
ziv@2265 933 loc)),
ziv@2265 934 loc)
ziv@2265 935
ziv@2265 936 fun eqsToInvalidation numArgs eqs =
ziv@2265 937 let
ziv@2265 938 fun inv n = if n < 0 then [] else IM.find (eqs, n) :: inv (n - 1)
ziv@2265 939 in
ziv@2265 940 inv (numArgs - 1)
ziv@2265 941 end
ziv@2265 942
ziv@2265 943 (* Tests if [ys] makes [xs] a redundant cache invalidation. [NONE] here
ziv@2265 944 represents unknown, which means a wider invalidation. *)
ziv@2265 945 val rec madeRedundantBy : atomExp option list * atomExp option list -> bool =
ziv@2265 946 fn ([], []) => true
ziv@2265 947 | (_ :: xs, NONE :: ys) => madeRedundantBy (xs, ys)
ziv@2265 948 | (SOME x :: xs, SOME y :: ys) => (case AtomExpKey.compare (x, y) of
ziv@2265 949 EQUAL => madeRedundantBy (xs, ys)
ziv@2265 950 | _ => false)
ziv@2265 951 | _ => false
ziv@2265 952
ziv@2265 953 fun eqss (query, dml) = conflictMaps (queryToFormula query, dmlToFormula dml)
ziv@2265 954
ziv@2265 955 fun invalidations ((query, numArgs), dml) =
ziv@2265 956 (map (map optionAtomExpToExp)
ziv@2265 957 o removeRedundant madeRedundantBy
ziv@2265 958 o map (eqsToInvalidation numArgs)
ziv@2265 959 o eqss)
ziv@2265 960 (query, dml)
ziv@2265 961
ziv@2265 962 end
ziv@2265 963
ziv@2265 964 val invalidations = Invalidations.invalidations
ziv@2265 965
ziv@2265 966 (* DEBUG *)
ziv@2265 967 (* val gunk : ((Sql.query * int) * Sql.dml) list ref = ref [] *)
ziv@2265 968 (* val gunk' : exp list ref = ref [] *)
ziv@2265 969
ziv@2265 970 fun addFlushing ((file, (tableToIndices, indexToQueryNumArgs, index)), effs) =
ziv@2265 971 let
ziv@2265 972 val flushes = List.concat
ziv@2265 973 o map (fn (i, argss) => map (fn args => flush (i, args)) argss)
ziv@2265 974 val doExp =
ziv@2267 975 fn dmlExp as EDml (dmlText, failureMode) =>
ziv@2265 976 let
ziv@2265 977 (* DEBUG *)
ziv@2265 978 (* val () = gunk' := origDmlText :: !gunk' *)
ziv@2265 979 (* val () = Print.preface ("SQLCACHE: ", (MonoPrint.p_exp MonoEnv.empty origDmlText)) *)
ziv@2265 980 val inval =
ziv@2265 981 case Sql.parse Sql.dml dmlText of
ziv@2265 982 SOME dmlParsed =>
ziv@2265 983 SOME (map (fn i => (case IM.find (indexToQueryNumArgs, i) of
ziv@2265 984 SOME queryNumArgs =>
ziv@2265 985 (* DEBUG *)
ziv@2265 986 ((* gunk := (queryNumArgs, dmlParsed) :: !gunk; *)
ziv@2265 987 (i, invalidations (queryNumArgs, dmlParsed)))
ziv@2265 988 (* TODO: fail more gracefully. *)
ziv@2265 989 | NONE => raise Match))
ziv@2265 990 (SIMM.findList (tableToIndices, tableDml dmlParsed)))
ziv@2265 991 | NONE => NONE
ziv@2265 992 in
ziv@2265 993 case inval of
ziv@2265 994 (* TODO: fail more gracefully. *)
ziv@2265 995 NONE => raise Match
ziv@2267 996 | SOME invs => sequence (flushes invs @ [dmlExp])
ziv@2265 997 end
ziv@2265 998 | e' => e'
ziv@2265 999 in
ziv@2265 1000 (* DEBUG *)
ziv@2265 1001 (* gunk := []; *)
ziv@2266 1002 fileMap doExp file
ziv@2265 1003 end
ziv@2265 1004
ziv@2265 1005
ziv@2265 1006 (***************)
ziv@2265 1007 (* Entry point *)
ziv@2265 1008 (***************)
ziv@2265 1009
ziv@2265 1010 val inlineSql =
ziv@2265 1011 let
ziv@2265 1012 val doExp =
ziv@2265 1013 (* TODO: EQuery, too? *)
ziv@2265 1014 (* ASK: should this live in [MonoOpt]? *)
ziv@2265 1015 fn EDml ((ECase (disc, cases, {disc = dTyp, ...}), loc), failureMode) =>
ziv@2265 1016 let
ziv@2265 1017 val newCases = map (fn (p, e) => (p, (EDml (e, failureMode), loc))) cases
ziv@2265 1018 in
ziv@2265 1019 ECase (disc, newCases, {disc = dTyp, result = (TRecord [], loc)})
ziv@2265 1020 end
ziv@2265 1021 | e => e
ziv@2265 1022 in
ziv@2265 1023 fileMap doExp
ziv@2265 1024 end
ziv@2265 1025
ziv@2262 1026 fun insertAfterDatatypes ((decls, sideInfo), newDecls) =
ziv@2262 1027 let
ziv@2262 1028 val (datatypes, others) = List.partition (fn (DDatatype _, _) => true | _ => false) decls
ziv@2262 1029 in
ziv@2262 1030 (datatypes @ newDecls @ others, sideInfo)
ziv@2262 1031 end
ziv@2262 1032
ziv@2267 1033 val go' = addFlushing o addCaching o simplifySql o inlineSql
ziv@2256 1034
ziv@2256 1035 fun go file =
ziv@2256 1036 let
ziv@2256 1037 (* TODO: do something nicer than [Sql] being in one of two modes. *)
ziv@2256 1038 val () = (resetFfiInfo (); Sql.sqlcacheMode := true)
ziv@2262 1039 val file = go' file
ziv@2262 1040 (* Important that this happens after [MonoFooify.urlify] calls! *)
ziv@2262 1041 val fmDecls = MonoFooify.getNewFmDecls ()
ziv@2256 1042 val () = Sql.sqlcacheMode := false
ziv@2256 1043 in
ziv@2262 1044 insertAfterDatatypes (file, rev fmDecls)
ziv@2250 1045 end
ziv@2250 1046
ziv@2209 1047 end