summaryrefslogtreecommitdiff
path: root/src/especialize.sml
blob: e2bbeb9dd5ea6532ad5eca318e6d3d8d99320e9f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
(* Copyright (c) 2008, Adam Chlipala
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - The names of contributors may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *)

structure ESpecialize :> ESPECIALIZE = struct

open Core

structure E = CoreEnv
structure U = CoreUtil

type skey = exp

structure K = struct
type ord_key = exp list
val compare = Order.joinL U.Exp.compare
end

structure KM = BinaryMapFn(K)
structure IM = IntBinaryMap
structure IS = IntBinarySet

val freeVars = U.Exp.foldB {kind = fn (_, _, xs) => xs,
                            con = fn (_, _, xs) => xs,
                            exp = fn (bound, e, xs) =>
                                     case e of
                                         ERel x =>
                                         if x >= bound then
                                             IS.add (xs, x - bound)
                                         else
                                             xs
                                       | _ => xs,
                            bind = fn (bound, b) =>
                                      case b of
                                          U.Exp.RelE _ => bound + 1
                                        | _ => bound}
                           0 IS.empty

val isPoly = U.Decl.exists {kind = fn _ => false,
                            con = fn _ => false,
                            exp = fn ECAbs _ => true
                                   | _ => false,
                            decl = fn _ => false}

fun positionOf (v : int, ls) =
    let
        fun pof (pos, ls) =
            case ls of
                [] => raise Fail "Defunc.positionOf"
              | v' :: ls' =>
                if v = v' then
                    pos
                else
                    pof (pos + 1, ls')
    in
        pof (0, ls)
    end

fun squish fvs =
    U.Exp.mapB {kind = fn _ => fn k => k,
                con = fn _ => fn c => c,
                exp = fn bound => fn e =>
                                     case e of
                                         ERel x =>
                                         if x >= bound then
                                             ERel (positionOf (x - bound, fvs) + bound)
                                         else
                                             e
                                       | _ => e,
                bind = fn (bound, b) =>
                          case b of
                              U.Exp.RelE _ => bound + 1
                            | _ => bound}
               0

type func = {
     name : string,
     args : int KM.map,
     body : exp,
     typ : con,
     tag : string
}

type state = {
     maxName : int,
     funcs : func IM.map,
     decls : (string * int * con * exp * string) list
}

fun default (_, x, st) = (x, st)

structure SS = BinarySetFn(struct
                           type ord_key = string
                           val compare = String.compare
                           end)

val mayNotSpec = ref SS.empty

fun specialize' file =
    let
        fun bind (env, b) =
            case b of
                U.Decl.RelE xt => xt :: env
              | _ => env

        fun exp (env, e, st : state) =
            let
                (*val () = Print.prefaces "exp" [("e", CorePrint.p_exp CoreEnv.empty
                                                                     (e, ErrorMsg.dummySpan))]*)

                fun getApp e =
                    case e of
                        ENamed f => SOME (f, [])
                      | EApp (e1, e2) =>
                        (case getApp (#1 e1) of
                             NONE => NONE
                           | SOME (f, xs) => SOME (f, xs @ [e2]))
                      | _ => NONE
            in
                case getApp e of
                    NONE => ((*Print.prefaces "No" [("e", CorePrint.p_exp CoreEnv.empty
                                                                        (e, ErrorMsg.dummySpan))];*)
                             (e, st))
                  | SOME (f, xs) =>
                    case IM.find (#funcs st, f) of
                        NONE => (e, st)
                      | SOME {name, args, body, typ, tag} =>
                        let
                            (*val () = Print.prefaces "Consider" [("e", CorePrint.p_exp CoreEnv.empty
                                                                                      (e, ErrorMsg.dummySpan))]*)

                            val functionInside = U.Con.exists {kind = fn _ => false,
                                                               con = fn TFun _ => true
                                                                      | CFfi ("Basis", "transaction") => true
                                                                      | CFfi ("Basis", "eq") => true
                                                                      | CFfi ("Basis", "num") => true
                                                                      | CFfi ("Basis", "ord") => true
                                                                      | CFfi ("Basis", "show") => true
                                                                      | CFfi ("Basis", "read") => true
                                                                      | CFfi ("Basis", "sql_injectable_prim") => true
                                                                      | CFfi ("Basis", "sql_injectable") => true
                                                                      | _ => false}
                            val loc = ErrorMsg.dummySpan

                            fun findSplit (xs, typ, fxs, fvs) =
                                case (#1 typ, xs) of
                                    (TFun (dom, ran), e :: xs') =>
                                    if functionInside dom then
                                        findSplit (xs',
                                                   ran,
                                                   e :: fxs,
                                                   IS.union (fvs, freeVars e))
                                    else
                                        (rev fxs, xs, fvs)
                                  | _ => (rev fxs, xs, fvs)

                            val (fxs, xs, fvs) = findSplit (xs, typ, [], IS.empty)

                            val fxs' = map (squish (IS.listItems fvs)) fxs

                            fun firstRel () =
                                case fxs' of
                                    (ERel _, _) :: _ => true
                                  | _ => false
                        in
                            (*Print.preface ("fxs'", Print.p_list (CorePrint.p_exp CoreEnv.empty) fxs');*)
                            if firstRel ()
                               orelse List.all (fn (ERel _, _) => true
                                                 | _ => false) fxs' then
                                (e, st)
                            else
                                case (KM.find (args, fxs'), SS.member (!mayNotSpec, name)) of
                                    (SOME f', _) =>
                                    let
                                        val e = (ENamed f', loc)
                                        val e = IS.foldr (fn (arg, e) => (EApp (e, (ERel arg, loc)), loc))
                                                         e fvs
                                        val e = foldl (fn (arg, e) => (EApp (e, arg), loc))
                                                      e xs
                                    in
                                        (*Print.prefaces "Brand new (reuse)"
                                                       [("e'", CorePrint.p_exp CoreEnv.empty e)];*)
                                        (#1 e, st)
                                    end
                                  | (_, true) => ((*Print.prefaces ("No(" ^ name ^ ")")
                                                                 [("fxs'",
                                                                   Print.p_list (CorePrint.p_exp CoreEnv.empty) fxs')];*)
                                                  (e, st))
                                  | (NONE, false) =>
                                    let
                                        (*val () = Print.prefaces "New one"
                                                 [("f", Print.PD.string (Int.toString f)),
                                                  ("mns", Print.p_list Print.PD.string
                                                                       (SS.listItems (!mayNotSpec)))]*)

                                        (*val () = Print.prefaces ("Yes(" ^ name ^ ")")
                                                                [("fxs'",
                                                                  Print.p_list (CorePrint.p_exp CoreEnv.empty) fxs')]*)

                                        fun subBody (body, typ, fxs') =
                                            case (#1 body, #1 typ, fxs') of
                                                (_, _, []) => SOME (body, typ)
                                              | (EAbs (_, _, _, body'), TFun (_, typ'), x :: fxs'') =>
                                                let
                                                    val body'' = E.subExpInExp (0, x) body'
                                                in
                                                    subBody (body'',
                                                             typ',
                                                             fxs'')
                                                end
                                              | _ => NONE
                                    in
                                        case subBody (body, typ, fxs') of
                                            NONE => (e, st)
                                          | SOME (body', typ') =>
                                            let
                                                val f' = #maxName st
                                                val args = KM.insert (args, fxs', f')
                                                val funcs = IM.insert (#funcs st, f, {name = name,
                                                                                      args = args,
                                                                                      body = body,
                                                                                      typ = typ,
                                                                                      tag = tag})
                                                val st = {
                                                    maxName = f' + 1,
                                                    funcs = funcs,
                                                    decls = #decls st
                                                }

                                                (*val () = Print.prefaces "specExp"
                                                                        [("f", CorePrint.p_exp env (ENamed f, loc)),
                                                                         ("f'", CorePrint.p_exp env (ENamed f', loc)),
                                                                         ("xs", Print.p_list (CorePrint.p_exp env) xs),
                                                                         ("fxs'", Print.p_list
                                                                                      (CorePrint.p_exp E.empty) fxs'),
                                                                         ("e", CorePrint.p_exp env (e, loc))]*)
                                                val (body', typ') = IS.foldl (fn (n, (body', typ')) =>
                                                                                 let
                                                                                     val (x, xt) = List.nth (env, n)
                                                                                 in
                                                                                     ((EAbs (x, xt, typ', body'),
                                                                                       loc),
                                                                                      (TFun (xt, typ'), loc))
                                                                                 end)
                                                                             (body', typ') fvs
                                                val mns = !mayNotSpec
                                                val () = mayNotSpec := SS.add (mns, name)
                                                (*val () = Print.preface ("body'", CorePrint.p_exp CoreEnv.empty body')*)
                                                val (body', st) = specExp env st body'
                                                val () = mayNotSpec := mns

                                                val e' = (ENamed f', loc)
                                                val e' = IS.foldr (fn (arg, e) => (EApp (e, (ERel arg, loc)), loc))
                                                                  e' fvs
                                                val e' = foldl (fn (arg, e) => (EApp (e, arg), loc))
                                                               e' xs
                                                (*val () = Print.prefaces "Brand new"
                                                                        [("e'", CorePrint.p_exp CoreEnv.empty e'),
                                                                         ("e", CorePrint.p_exp CoreEnv.empty (e, loc)),
                                                                         ("body'", CorePrint.p_exp CoreEnv.empty body')]*)
                                            in
                                                (#1 e',
                                                 {maxName = #maxName st,
                                                  funcs = #funcs st,
                                                  decls = (name, f', typ', body', tag) :: #decls st})
                                            end
                                    end
                        end
            end

        and specExp env = U.Exp.foldMapB {kind = default, con = default, exp = exp, bind = bind} env

        val specDecl = U.Decl.foldMapB {kind = default, con = default, exp = exp, decl = default, bind = bind}

        fun doDecl (d, (st : state, changed)) =
            let
                (*val befor = Time.now ()*)

                val funcs = #funcs st
                val funcs = 
                    case #1 d of
                        DValRec vis =>
                        foldl (fn ((x, n, c, e, tag), funcs) =>
                                  IM.insert (funcs, n, {name = x,
                                                        args = KM.empty,
                                                        body = e,
                                                        typ = c,
                                                        tag = tag}))
                              funcs vis
                      | _ => funcs

                val st = {maxName = #maxName st,
                          funcs = funcs,
                          decls = []}

                (*val () = Print.prefaces "decl" [("d", CorePrint.p_decl CoreEnv.empty d)]*)

                val (d', st) =
                    if isPoly d then
                        (d, st)
                    else
                        (mayNotSpec := (case #1 d of
                                            DValRec vis => foldl (fn ((x, _, _, _, _), mns) =>
                                                                     SS.add (mns, x)) SS.empty vis
                                          | DVal (x, _, _, _, _) => SS.singleton x
                                          | _ => SS.empty);
                         specDecl [] st d
                         before mayNotSpec := SS.empty)

                (*val () = print "/decl\n"*)

                val funcs = #funcs st
                val funcs =
                    case #1 d of
                        DVal (x, n, c, e as (EAbs _, _), tag) =>
                        IM.insert (funcs, n, {name = x,
                                              args = KM.empty,
                                              body = e,
                                              typ = c,
                                              tag = tag})
                      | DVal (_, n, _, (ENamed n', _), _) =>
                        (case IM.find (funcs, n') of
                             NONE => funcs
                           | SOME v => IM.insert (funcs, n, v))
                      | _ => funcs

                val (changed, ds) =
                    case #decls st of
                        [] => (changed, [d'])
                      | vis =>
                        (true, case d' of
                                   (DValRec vis', _) => [(DValRec (vis @ vis'), ErrorMsg.dummySpan)]
                                 | _ => [(DValRec vis, ErrorMsg.dummySpan), d'])
            in
                (*Print.prefaces "doDecl" [("d", CorePrint.p_decl E.empty d),
                                         ("d'", CorePrint.p_decl E.empty d')];*)
                (ds, ({maxName = #maxName st,
                       funcs = funcs,
                       decls = []}, changed))
            end

        val (ds, (_, changed)) = ListUtil.foldlMapConcat doDecl
                                                            ({maxName = U.File.maxName file + 1,
                                                              funcs = IM.empty,
                                                              decls = []},
                                                             false)
                                                            file
    in
        (changed, ds)
    end

fun specialize file =
    let
        val file = ReduceLocal.reduce file
        (*val () = Print.prefaces "Intermediate" [("file", CorePrint.p_file CoreEnv.empty file)]*)
        (*val file = ReduceLocal.reduce file*)
        val (changed, file) = specialize' file
        (*val file = ReduceLocal.reduce file
        val file = CoreUntangle.untangle file
        val file = Shake.shake file*)
    in
        (*print "Round over\n";*)
        if changed then
            let
                (*val file = ReduceLocal.reduce file*)
                (*val () = Print.prefaces "Pre-untangle" [("file", CorePrint.p_file CoreEnv.empty file)]*)
                val file = CoreUntangle.untangle file
                (*val () = Print.prefaces "Post-untangle" [("file", CorePrint.p_file CoreEnv.empty file)]*)
                val file = Shake.shake file
            in
                (*print "Again!\n";*)
                specialize file
            end
        else
            file
    end

end