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1 | (* Copyright (C) 1999-2006 Henry Cejtin, Matthew Fluet, Suresh |
2 | * Jagannathan, and Stephen Weeks. | |
3 | * Copyright (C) 1997-2000 NEC Research Institute. | |
4 | * | |
5 | * MLton is released under a BSD-style license. | |
6 | * See the file MLton-LICENSE for details. | |
7 | *) | |
8 | ||
9 | functor Uncurry(S: XML_TRANSFORM_STRUCTS): XML_TRANSFORM = | |
10 | struct | |
11 | ||
12 | open S | |
13 | open Dec PrimExp | |
14 | ||
15 | fun transform (program as Program.T{datatypes, body, overflow}) = | |
16 | let | |
17 | datatype D = T of {var: Var.t, lambda : Lambda.t} | |
18 | ||
19 | val {get = getArity: Var.t -> int, | |
20 | set = setArity, ...} = | |
21 | Property.getSet(Var.plist, | |
22 | Property.initConst 0) | |
23 | ||
24 | val {get = curriedRep: Var.t -> {unCurriedFun: D, curriedFun: D} option, | |
25 | set = setCurriedRep, ...} = | |
26 | Property.getSet(Var.plist, | |
27 | Property.initConst NONE) | |
28 | ||
29 | val {get = getType: Var.t -> {args: Type.t vector, result: Type.t}, | |
30 | set = setType, ...} = | |
31 | Property.getSet(Var.plist, | |
32 | Property.initConst {args = Vector.new1 Type.unit, | |
33 | result = Type.unit}) | |
34 | ||
35 | fun getResultType(exp) = | |
36 | let | |
37 | val {decs,result} = Exp.dest(exp) | |
38 | in | |
39 | List.fold | |
40 | (decs, Type.unit, fn (d, i) => | |
41 | case d of | |
42 | MonoVal {var, ty, exp} => | |
43 | if Var.equals(var,VarExp.var(result)) | |
44 | then ty | |
45 | else i | |
46 | | Fun {tyvars, decs} => | |
47 | Vector.fold | |
48 | (decs, Type.unit, fn ({var,ty,lambda}, i) => | |
49 | if Var.equals(var,VarExp.var(result)) | |
50 | then ty | |
51 | else i) | |
52 | | _ => i) | |
53 | end | |
54 | ||
55 | fun buildLambda(f,args,types,resultType) = | |
56 | let | |
57 | val newArg' = Var.newString("c") | |
58 | val newArg'' = Var.newString("c") | |
59 | in | |
60 | Lambda.new | |
61 | {arg = Vector.last(args), | |
62 | argType = Vector.last(types), | |
63 | body = Vector.fold2 | |
64 | (Vector.tabulate(Vector.length args - 2, | |
65 | fn i => Vector.sub(args, i + 1)), | |
66 | Vector.tabulate(Vector.length types - 2, | |
67 | fn i => Vector.sub(types, i + 1)), | |
68 | let | |
69 | val newVar = Var.newString("c") | |
70 | val arg = Vector.sub(args,0) | |
71 | val argType = Vector.sub(types,0) | |
72 | val decs = | |
73 | [MonoVal | |
74 | {var = newVar, | |
75 | ty = Type.arrow(argType,resultType), | |
76 | exp = Lambda | |
77 | (Lambda.new | |
78 | {arg = arg, | |
79 | argType = argType, | |
80 | body = Exp.new | |
81 | {decs = | |
82 | [MonoVal | |
83 | {var = newArg', | |
84 | ty = Type.tuple(Vector.rev(types)), | |
85 | exp = Tuple(Vector.map | |
86 | (Vector.rev(args), | |
87 | fn a => VarExp.mono(a)))}, | |
88 | MonoVal | |
89 | {var = newArg'', | |
90 | ty = resultType, | |
91 | exp = App {func = f, | |
92 | arg = VarExp.mono(newArg')}}], | |
93 | result = VarExp.mono(newArg'')}})}] | |
94 | val result = VarExp.mono(newVar) | |
95 | in | |
96 | Exp.new | |
97 | {decs = decs, result = result} | |
98 | end, | |
99 | fn (a, atype, i) => | |
100 | let | |
101 | val newVar = Var.newString("c") | |
102 | in | |
103 | Exp.new | |
104 | {decs = [MonoVal | |
105 | {var = newVar, | |
106 | ty = Type.arrow(atype, getResultType(i)), | |
107 | exp = Lambda(Lambda.new {arg = a, | |
108 | argType = atype, | |
109 | body = i})}], | |
110 | result = VarExp.mono(newVar)} | |
111 | end)} | |
112 | end | |
113 | ||
114 | fun uncurryFun(dec) = | |
115 | let | |
116 | fun lamExp(decs,result,args,types,newDecs,e) = | |
117 | case decs of | |
118 | [] => (args,types,e) | |
119 | | d::rest => | |
120 | case d of | |
121 | Dec.MonoVal{var, ty, exp = Const c} => | |
122 | lamExp(rest, result, args,types,d::newDecs,e) | |
123 | | Dec.MonoVal{var, ty, exp = Var v} => | |
124 | lamExp(rest, result, args,types,d::newDecs,e) | |
125 | | Dec.MonoVal{var, ty, exp = Select tuple} => | |
126 | lamExp(rest, result, args,types,d::newDecs,e) | |
127 | | Dec.MonoVal{var, ty, exp = Lambda l} => | |
128 | let | |
129 | val body = Lambda.body(l) | |
130 | val r = result | |
131 | val {decs,result} = Exp.dest(body) | |
132 | val newDecs = List.append(newDecs,decs) | |
133 | val new = Exp.new{decs = newDecs,result = result} | |
134 | in | |
135 | if Var.equals(var, VarExp.var(r)) | |
136 | andalso List.isEmpty(rest) | |
137 | then lamExp(newDecs, | |
138 | result, | |
139 | Lambda.arg(l)::args, | |
140 | Lambda.argType(l)::types, | |
141 | [], | |
142 | new) | |
143 | else (args,types,e) | |
144 | end | |
145 | | _ => (args,types,e) | |
146 | val lamExp = fn x => | |
147 | let val (args,types,e) = lamExp x | |
148 | in (Vector.fromList args, Vector.fromList types, e) | |
149 | end | |
150 | ||
151 | val T{var,lambda} = dec | |
152 | val (f, r) = let | |
153 | val arg = Lambda.arg(lambda) | |
154 | val argType = Lambda.argType(lambda) | |
155 | val body = Lambda.body(lambda) | |
156 | val {decs,result} = Exp.dest(body) | |
157 | in | |
158 | (var, lamExp(decs, result, [arg], [argType], [],body)) | |
159 | end | |
160 | ||
161 | fun buildCurried (f,args,types,e) = | |
162 | let | |
163 | val newVar = Var.newString("c") | |
164 | val newArg = Var.newString("c") | |
165 | val (newDecs,n) = | |
166 | Vector.fold2 | |
167 | (Vector.rev(args), | |
168 | Vector.rev(types), | |
169 | ([],0), fn (a, mtype, (l, i)) => | |
170 | (MonoVal | |
171 | {var = a, | |
172 | ty = mtype, | |
173 | exp = PrimExp.Select {tuple = VarExp.mono(newArg), | |
174 | offset = i}}::l, | |
175 | i+1)) | |
176 | val newExp = Exp.new {decs = List.append(newDecs, Exp.decs(e)), | |
177 | result = Exp.result(e)} | |
178 | val resultType = getResultType(newExp) | |
179 | val unCurriedFun = | |
180 | T{var = newVar, | |
181 | lambda = Lambda.new {arg = newArg, | |
182 | argType = Type.tuple(Vector.rev(types)), | |
183 | body = newExp}} | |
184 | val newArgs = Vector.map(args, fn z => Var.newString("c")) | |
185 | val newFun = buildLambda(VarExp.mono(newVar),newArgs,types,resultType) | |
186 | ||
187 | val newFunBinding = T{var = f, lambda = newFun} | |
188 | in | |
189 | setCurriedRep(f, SOME {unCurriedFun = unCurriedFun, | |
190 | curriedFun = newFunBinding}) | |
191 | end | |
192 | in | |
193 | case r of | |
194 | (args,types,e) => | |
195 | (setArity(f, Vector.length(args)); | |
196 | setType(f, {args = types, result = getResultType(e)}); | |
197 | if getArity(f) > 1 | |
198 | then buildCurried(f,args,types,e) | |
199 | else ()) | |
200 | end | |
201 | ||
202 | fun replaceVar(decs,old,new) = | |
203 | let | |
204 | fun compare(v) = if Var.equals(VarExp.var(v),old) | |
205 | then new | |
206 | else v | |
207 | fun replaceExp(e) = let | |
208 | val {decs,result} = Exp.dest(e) | |
209 | val newDecs = replaceVar(decs,old,new) | |
210 | val newResult = compare(result) | |
211 | in | |
212 | Exp.new {decs = newDecs, | |
213 | result = newResult} | |
214 | end | |
215 | in | |
216 | List.map | |
217 | (decs, fn d => | |
218 | (case d of | |
219 | MonoVal {var, ty, exp} => | |
220 | MonoVal {var=var, | |
221 | ty = ty, | |
222 | exp = (case exp of | |
223 | Var v => PrimExp.Var(compare(v)) | |
224 | | Tuple vs => | |
225 | Tuple(Vector.map(vs, fn v => compare(v))) | |
226 | | Select {tuple,offset} => | |
227 | Select {tuple = compare(tuple), | |
228 | offset = offset} | |
229 | | Lambda l => | |
230 | let | |
231 | val {arg,argType,body} = Lambda.dest(l) | |
232 | val {decs,result} = Exp.dest(body) | |
233 | val newDecs = replaceVar(decs,old,new) | |
234 | in | |
235 | Lambda (Lambda.new | |
236 | {arg=arg, | |
237 | argType=argType, | |
238 | body=Exp.new {decs = newDecs, | |
239 | result = result}}) | |
240 | end | |
241 | | ConApp {con,targs,arg} => | |
242 | (case arg of | |
243 | NONE => exp | |
244 | | SOME v => ConApp {con = con, | |
245 | targs = targs, | |
246 | arg = SOME (compare(v))}) | |
247 | | PrimApp {prim,targs,args} => | |
248 | PrimApp {prim = prim, | |
249 | targs = targs, | |
250 | args = Vector.map(args, fn a => compare(a))} | |
251 | | App {func,arg} => | |
252 | App {func = compare(func), | |
253 | arg = compare(arg)} | |
254 | | Raise {exn,filePos} => | |
255 | Raise {exn = compare(exn), | |
256 | filePos = filePos} | |
257 | | Case {test,cases,default} => | |
258 | Case {test=compare(test), | |
259 | cases = Cases.map | |
260 | (cases,fn e => | |
261 | replaceExp(e)), | |
262 | default = Option.map | |
263 | (default, fn (e,r) => | |
264 | (replaceExp e,r))} | |
265 | | Handle {try,catch,handler} => | |
266 | Handle {try = replaceExp(try), | |
267 | catch = catch, | |
268 | handler = replaceExp(handler)} | |
269 | | _ => exp)} | |
270 | | Fun {tyvars,decs} => | |
271 | Fun {tyvars=tyvars, | |
272 | decs = Vector.map | |
273 | (decs, fn {var,ty,lambda} => | |
274 | {var = var, | |
275 | ty = ty, | |
276 | lambda = let | |
277 | val {arg,argType,body} = | |
278 | Lambda.dest(lambda) | |
279 | in | |
280 | Lambda.new | |
281 | ({arg = arg, | |
282 | argType = argType, | |
283 | body = replaceExp(body)}) | |
284 | end})} | |
285 | | _ => d)) | |
286 | end | |
287 | ||
288 | fun uncurryApp(decs,expResult) = | |
289 | let | |
290 | fun makeUncurryApp(f,arguments,lastCall) = | |
291 | let | |
292 | val newArg = Var.newString("c") | |
293 | val newArg' = Var.newString("c") | |
294 | val varF = VarExp.var(f) | |
295 | val {args,result} = getType(varF) | |
296 | val var = (case curriedRep(varF) of | |
297 | NONE => Error.bug "Uncurry: uncurryApp" | |
298 | | SOME {unCurriedFun,curriedFun} => | |
299 | let val T{var,lambda} = unCurriedFun | |
300 | in var | |
301 | end) | |
302 | val argDec = MonoVal{var = newArg, | |
303 | ty = Type.tuple(Vector.rev(args)), | |
304 | exp = Tuple(Vector.rev(arguments))} | |
305 | val appDec = MonoVal{var = newArg', | |
306 | ty = result, | |
307 | exp = App {func = VarExp.mono(var), | |
308 | arg = VarExp.mono(newArg)}} | |
309 | val newR = if Var.equals(lastCall, VarExp.var(expResult)) | |
310 | then (SOME newArg') | |
311 | else NONE | |
312 | in (appDec::[argDec],newR,newArg') | |
313 | end | |
314 | in case decs of | |
315 | [] => Error.bug "Uncurry: uncurryApp" | |
316 | | d::r => (case d of | |
317 | MonoVal {var, ty, exp = App {func,arg}} => | |
318 | (case curriedRep(VarExp.var(func)) of | |
319 | NONE => Error.bug "Uncurry: uncurryApp" | |
320 | | SOME _ => let | |
321 | val arity = getArity(VarExp.var(func)) | |
322 | fun loop(args,arity,d,f) = | |
323 | if arity = 0 | |
324 | then SOME (Vector.fromList args,d,f) | |
325 | else | |
326 | case d of | |
327 | [] => NONE | |
328 | | h::r => | |
329 | (case h of | |
330 | MonoVal {var,ty, | |
331 | exp = App {func,arg}} => | |
332 | if Var.equals(VarExp.var(func),f) | |
333 | then loop(arg::args, | |
334 | arity-1, | |
335 | r, | |
336 | var) | |
337 | else NONE | |
338 | | _ => NONE) | |
339 | in | |
340 | case loop([arg],arity-1,r,var) of | |
341 | NONE => ([d],r,NONE) | |
342 | | SOME (args,r,lastCall) => | |
343 | let | |
344 | val (newDecs,newR,newArg) = | |
345 | makeUncurryApp(func,args,lastCall) | |
346 | val r = (replaceVar(r,lastCall, | |
347 | VarExp.mono(newArg))) | |
348 | in | |
349 | (newDecs,r,newR) | |
350 | end | |
351 | end) | |
352 | | _ => Error.bug "Uncurry: uncurryApp") | |
353 | end | |
354 | ||
355 | fun singleUse(var,decs) = | |
356 | let | |
357 | fun compare(e) = (case e of | |
358 | App {func,arg} => Var.equals(VarExp.var(func),var) | |
359 | | _ => false) | |
360 | in | |
361 | List.fold | |
362 | (decs, false, fn (d,r) => | |
363 | case d of | |
364 | MonoVal {var,ty,exp} => compare(exp) | |
365 | | _ => false) | |
366 | end | |
367 | ||
368 | ||
369 | fun transform(body) = | |
370 | let | |
371 | val {decs,result} = Exp.dest(body) | |
372 | val newR = ref NONE | |
373 | in | |
374 | Exp.new | |
375 | {decs = | |
376 | List.rev | |
377 | (let | |
378 | fun loop(decs,newDecs) = | |
379 | case decs of | |
380 | [] => newDecs | |
381 | | d::rest => | |
382 | (case d of | |
383 | MonoVal {var,ty, exp = Lambda l} => | |
384 | (case curriedRep(var) of | |
385 | NONE => | |
386 | let | |
387 | val lamBody = Lambda.body(l) | |
388 | val arg = Lambda.arg(l) | |
389 | val argType = Lambda.argType(l) | |
390 | val newLam = | |
391 | Lambda.new{arg=arg, | |
392 | argType = argType, | |
393 | body = transform(lamBody)} | |
394 | val newDec = MonoVal{var=var, | |
395 | ty=ty, | |
396 | exp = Lambda newLam} | |
397 | in | |
398 | loop(rest,newDec::newDecs) | |
399 | end | |
400 | | SOME {unCurriedFun,curriedFun} => | |
401 | let | |
402 | val T{var,lambda} = unCurriedFun | |
403 | val body = Lambda.body(lambda) | |
404 | val newBody = transform(body) | |
405 | val resultType = getResultType(newBody) | |
406 | val argType = Lambda.argType(lambda) | |
407 | val l = Lambda(Lambda.new | |
408 | {arg = | |
409 | Lambda.arg(lambda), | |
410 | argType = argType, | |
411 | body = newBody}) | |
412 | val b1 = MonoVal{var=var, | |
413 | ty = Type.arrow(argType,resultType), | |
414 | exp = l} | |
415 | val T{var,lambda} = curriedFun | |
416 | val argType = Lambda.argType(lambda) | |
417 | val resultType = getResultType(Lambda.body(lambda)) | |
418 | val b2 = MonoVal{var=var, | |
419 | ty = | |
420 | Type.arrow(argType, resultType), | |
421 | exp = Lambda lambda} | |
422 | in loop(rest,b2::(b1::newDecs)) | |
423 | end) | |
424 | | MonoVal {var,ty,exp = App {func,arg}} => | |
425 | (case curriedRep(VarExp.var(func)) of | |
426 | NONE => loop(rest,d::newDecs) | |
427 | | SOME _ => | |
428 | if singleUse(var,rest) | |
429 | then | |
430 | let | |
431 | val (appDecs,r,newResult) = | |
432 | uncurryApp(decs,result) | |
433 | in (newR := newResult; | |
434 | loop(r,List.append(appDecs,newDecs))) | |
435 | end | |
436 | else loop(rest,d::newDecs)) | |
437 | | MonoVal {var,ty,exp = Case {test,cases,default}} => | |
438 | let | |
439 | val newCases = | |
440 | Cases.map(cases, fn e => transform(e)) | |
441 | val default = Option.map | |
442 | (default, fn (e,r) => | |
443 | (transform(e),r)) | |
444 | in | |
445 | loop(rest, | |
446 | (MonoVal{var=var, | |
447 | ty=ty, | |
448 | exp = Case {test = test, | |
449 | cases = newCases, | |
450 | default = default}}:: | |
451 | newDecs)) | |
452 | end | |
453 | | MonoVal {var,ty, exp = Handle {try,catch,handler}} => | |
454 | loop(rest, | |
455 | (MonoVal{var=var, | |
456 | ty=ty, | |
457 | exp = Handle {try = transform(try), | |
458 | catch = catch, | |
459 | handler = transform(handler)}}:: | |
460 | newDecs)) | |
461 | | Fun {tyvars,decs} => | |
462 | loop(rest, | |
463 | Fun {tyvars = Vector.new0 (), | |
464 | decs = | |
465 | Vector.fromList( | |
466 | Vector.fold | |
467 | (decs, | |
468 | []:{var:Var.t, | |
469 | ty:Type.t, | |
470 | lambda:Lambda.t} list, | |
471 | fn (d as {var, | |
472 | ty, | |
473 | lambda:Lambda.t}, | |
474 | acc) => | |
475 | (case curriedRep(var) of | |
476 | NONE => | |
477 | let | |
478 | val body = Lambda.body(lambda) | |
479 | val arg = Lambda.arg(lambda) | |
480 | val argType = Lambda.argType(lambda) | |
481 | val newBody = transform(body) | |
482 | val newLam = Lambda.new{arg = arg, | |
483 | argType = argType, | |
484 | body = newBody} | |
485 | in | |
486 | {var=var, | |
487 | ty=ty, | |
488 | lambda=newLam}::acc | |
489 | end | |
490 | | SOME {unCurriedFun,curriedFun} => | |
491 | let | |
492 | val T{var,lambda} = unCurriedFun | |
493 | val body = Lambda.body(lambda) | |
494 | val newBody = transform(body) | |
495 | val argType = Lambda.argType(lambda) | |
496 | val resultType = getResultType(newBody) | |
497 | val b1 = {var=var, | |
498 | ty = Type.arrow(argType,resultType), | |
499 | lambda = | |
500 | Lambda.new{arg = Lambda.arg(lambda), | |
501 | argType = argType, | |
502 | body = newBody}} | |
503 | val T{var,lambda} = curriedFun | |
504 | val argType = Lambda.argType(lambda) | |
505 | val newBody = transform(Lambda.body(lambda)) | |
506 | val resultType = getResultType(newBody) | |
507 | val b2 = {var=var, | |
508 | ty = Type.arrow(argType,resultType), | |
509 | lambda = lambda} | |
510 | in b1::(b2::acc) | |
511 | end)))}::newDecs) | |
512 | | _ => loop(rest,d::newDecs)) | |
513 | in loop(decs,[]) | |
514 | end), | |
515 | result = (case !newR of | |
516 | NONE => result | |
517 | | SOME r => VarExp.mono(r))} | |
518 | end | |
519 | in | |
520 | Exp.foreachExp | |
521 | (body, fn e => | |
522 | let | |
523 | val {decs,result} = Exp.dest(e) | |
524 | in | |
525 | List.foreach | |
526 | (decs, fn d => | |
527 | case d of | |
528 | MonoVal {var,ty,exp = Lambda l} => | |
529 | uncurryFun(T{var=var,lambda=l}) | |
530 | | Fun {tyvars,decs} => | |
531 | Vector.foreach | |
532 | (decs, fn {var,ty,lambda} => | |
533 | uncurryFun(T{var=var,lambda=lambda})) | |
534 | | _ => ()) | |
535 | end); | |
536 | let val newBody = transform(body) | |
537 | in | |
538 | Program.T{datatypes = datatypes, body = newBody, overflow = overflow} | |
539 | end | |
540 | end | |
541 | end |