Conversions to/from generic array representation (not finished yet)
[ghc.git] / compiler / vectorise / VectType.hs
1 module VectType ( vectTyCon, vectType, vectTypeEnv,
2 PAInstance, buildPADict )
3 where
4
5 #include "HsVersions.h"
6
7 import VectMonad
8 import VectUtils
9 import VectCore
10
11 import HscTypes ( TypeEnv, extendTypeEnvList, typeEnvTyCons )
12 import CoreSyn
13 import CoreUtils
14 import BuildTyCl
15 import DataCon
16 import TyCon
17 import Type
18 import TypeRep
19 import Coercion
20 import FamInstEnv ( FamInst, mkLocalFamInst )
21 import InstEnv ( Instance, mkLocalInstance, instanceDFunId )
22 import OccName
23 import MkId
24 import BasicTypes ( StrictnessMark(..), OverlapFlag(..), boolToRecFlag )
25 import Var ( Var )
26 import Id ( mkWildId )
27 import Name ( Name, getOccName )
28 import NameEnv
29 import TysWiredIn ( unitTy, intTy, intDataCon )
30 import TysPrim ( intPrimTy )
31
32 import Unique
33 import UniqFM
34 import UniqSet
35 import Digraph ( SCC(..), stronglyConnComp )
36
37 import Outputable
38
39 import Control.Monad ( liftM, liftM2, zipWithM, zipWithM_ )
40 import Data.List ( inits, tails, zipWith4, zipWith5 )
41
42 -- ----------------------------------------------------------------------------
43 -- Types
44
45 vectTyCon :: TyCon -> VM TyCon
46 vectTyCon tc
47 | isFunTyCon tc = builtin closureTyCon
48 | isBoxedTupleTyCon tc = return tc
49 | isUnLiftedTyCon tc = return tc
50 | otherwise = do
51 r <- lookupTyCon tc
52 case r of
53 Just tc' -> return tc'
54
55 -- FIXME: just for now
56 Nothing -> pprTrace "ccTyCon:" (ppr tc) $ return tc
57
58 vectType :: Type -> VM Type
59 vectType ty | Just ty' <- coreView ty = vectType ty'
60 vectType (TyVarTy tv) = return $ TyVarTy tv
61 vectType (AppTy ty1 ty2) = liftM2 AppTy (vectType ty1) (vectType ty2)
62 vectType (TyConApp tc tys) = liftM2 TyConApp (vectTyCon tc) (mapM vectType tys)
63 vectType (FunTy ty1 ty2) = liftM2 TyConApp (builtin closureTyCon)
64 (mapM vectType [ty1,ty2])
65 vectType ty@(ForAllTy _ _)
66 = do
67 mdicts <- mapM paDictArgType tyvars
68 mono_ty' <- vectType mono_ty
69 return $ tyvars `mkForAllTys` ([dict | Just dict <- mdicts] `mkFunTys` mono_ty')
70 where
71 (tyvars, mono_ty) = splitForAllTys ty
72
73 vectType ty = pprPanic "vectType:" (ppr ty)
74
75 -- ----------------------------------------------------------------------------
76 -- Type definitions
77
78 type TyConGroup = ([TyCon], UniqSet TyCon)
79
80 data PAInstance = PAInstance {
81 painstDFun :: Var
82 , painstOrigTyCon :: TyCon
83 , painstVectTyCon :: TyCon
84 , painstArrTyCon :: TyCon
85 }
86
87 vectTypeEnv :: TypeEnv -> VM (TypeEnv, [FamInst], [(Var, CoreExpr)])
88 vectTypeEnv env
89 = do
90 cs <- readGEnv $ mk_map . global_tycons
91 let (conv_tcs, keep_tcs) = classifyTyCons cs groups
92 keep_dcs = concatMap tyConDataCons keep_tcs
93 zipWithM_ defTyCon keep_tcs keep_tcs
94 zipWithM_ defDataCon keep_dcs keep_dcs
95 new_tcs <- vectTyConDecls conv_tcs
96
97 let orig_tcs = keep_tcs ++ conv_tcs
98 vect_tcs = keep_tcs ++ new_tcs
99
100 repr_tcs <- zipWithM buildPReprTyCon orig_tcs vect_tcs
101 parr_tcs <- zipWithM buildPArrayTyCon orig_tcs vect_tcs
102 dfuns <- mapM mkPADFun vect_tcs
103 defTyConPAs (zip vect_tcs dfuns)
104 binds <- sequence (zipWith5 buildTyConBindings orig_tcs
105 vect_tcs
106 repr_tcs
107 parr_tcs
108 dfuns)
109
110 let all_new_tcs = new_tcs ++ repr_tcs ++ parr_tcs
111
112 let new_env = extendTypeEnvList env
113 (map ATyCon all_new_tcs
114 ++ [ADataCon dc | tc <- all_new_tcs
115 , dc <- tyConDataCons tc])
116
117 return (new_env, map mkLocalFamInst (repr_tcs ++ parr_tcs), concat binds)
118 where
119 tycons = typeEnvTyCons env
120 groups = tyConGroups tycons
121
122 mk_map env = listToUFM_Directly [(u, getUnique n /= u) | (u,n) <- nameEnvUniqueElts env]
123
124 keep_tc tc = let dcs = tyConDataCons tc
125 in
126 defTyCon tc tc >> zipWithM_ defDataCon dcs dcs
127
128
129 vectTyConDecls :: [TyCon] -> VM [TyCon]
130 vectTyConDecls tcs = fixV $ \tcs' ->
131 do
132 mapM_ (uncurry defTyCon) (lazy_zip tcs tcs')
133 mapM vectTyConDecl tcs
134 where
135 lazy_zip [] _ = []
136 lazy_zip (x:xs) ~(y:ys) = (x,y) : lazy_zip xs ys
137
138 vectTyConDecl :: TyCon -> VM TyCon
139 vectTyConDecl tc
140 = do
141 name' <- cloneName mkVectTyConOcc name
142 rhs' <- vectAlgTyConRhs (algTyConRhs tc)
143
144 liftDs $ buildAlgTyCon name'
145 tyvars
146 [] -- no stupid theta
147 rhs'
148 rec_flag -- FIXME: is this ok?
149 False -- FIXME: no generics
150 False -- not GADT syntax
151 Nothing -- not a family instance
152 where
153 name = tyConName tc
154 tyvars = tyConTyVars tc
155 rec_flag = boolToRecFlag (isRecursiveTyCon tc)
156
157 vectAlgTyConRhs :: AlgTyConRhs -> VM AlgTyConRhs
158 vectAlgTyConRhs (DataTyCon { data_cons = data_cons
159 , is_enum = is_enum
160 })
161 = do
162 data_cons' <- mapM vectDataCon data_cons
163 zipWithM_ defDataCon data_cons data_cons'
164 return $ DataTyCon { data_cons = data_cons'
165 , is_enum = is_enum
166 }
167
168 vectDataCon :: DataCon -> VM DataCon
169 vectDataCon dc
170 | not . null $ dataConExTyVars dc = pprPanic "vectDataCon: existentials" (ppr dc)
171 | not . null $ dataConEqSpec dc = pprPanic "vectDataCon: eq spec" (ppr dc)
172 | otherwise
173 = do
174 name' <- cloneName mkVectDataConOcc name
175 tycon' <- vectTyCon tycon
176 arg_tys <- mapM vectType rep_arg_tys
177
178 liftDs $ buildDataCon name'
179 False -- not infix
180 (map (const NotMarkedStrict) arg_tys)
181 [] -- no labelled fields
182 univ_tvs
183 [] -- no existential tvs for now
184 [] -- no eq spec for now
185 [] -- no context
186 arg_tys
187 tycon'
188 where
189 name = dataConName dc
190 univ_tvs = dataConUnivTyVars dc
191 rep_arg_tys = dataConRepArgTys dc
192 tycon = dataConTyCon dc
193
194 mk_fam_inst :: TyCon -> TyCon -> (TyCon, [Type])
195 mk_fam_inst fam_tc arg_tc
196 = (fam_tc, [mkTyConApp arg_tc . mkTyVarTys $ tyConTyVars arg_tc])
197
198 buildPReprTyCon :: TyCon -> TyCon -> VM TyCon
199 buildPReprTyCon orig_tc vect_tc
200 = do
201 name <- cloneName mkPReprTyConOcc (tyConName orig_tc)
202 rhs_ty <- buildPReprType vect_tc
203 prepr_tc <- builtin preprTyCon
204 liftDs $ buildSynTyCon name
205 tyvars
206 (SynonymTyCon rhs_ty)
207 (Just $ mk_fam_inst prepr_tc vect_tc)
208 where
209 tyvars = tyConTyVars vect_tc
210
211 buildPReprType :: TyCon -> VM Type
212 buildPReprType = mkPRepr . map dataConRepArgTys . tyConDataCons
213
214 buildToPRepr :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
215 buildToPRepr _ vect_tc prepr_tc _
216 = do
217 arg <- newLocalVar FSLIT("x") arg_ty
218 bndrss <- mapM (mapM (newLocalVar FSLIT("x"))) rep_tys
219 (alt_bodies, res_ty) <- mkToPRepr $ map (map Var) bndrss
220
221 return . Lam arg
222 . wrapFamInstBody prepr_tc var_tys
223 . Case (Var arg) (mkWildId arg_ty) res_ty
224 $ zipWith3 mk_alt data_cons bndrss alt_bodies
225 where
226 var_tys = mkTyVarTys $ tyConTyVars vect_tc
227 arg_ty = mkTyConApp vect_tc var_tys
228 data_cons = tyConDataCons vect_tc
229 rep_tys = map dataConRepArgTys data_cons
230
231 mk_alt data_con bndrs body = (DataAlt data_con, bndrs, body)
232
233 buildToArrPRepr :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
234 buildToArrPRepr _ vect_tc prepr_tc arr_tc
235 = do
236 arg_ty <- mkPArrayType el_ty
237 rep_tys <- mapM (mapM mkPArrayType) rep_el_tys
238
239 arg <- newLocalVar FSLIT("xs") arg_ty
240 bndrss <- mapM (mapM (newLocalVar FSLIT("ys"))) rep_tys
241 len <- newLocalVar FSLIT("len") intPrimTy
242 sel <- newLocalVar FSLIT("sel") =<< mkPArrayType intTy
243
244 let add_sel xs | has_selector = sel : xs
245 | otherwise = xs
246
247 all_bndrs = len : add_sel (concat bndrss)
248
249 res <- parrayCoerce prepr_tc var_tys
250 =<< mkToArrPRepr (Var len) (Var sel) (map (map Var) bndrss)
251 res_ty <- mkPArrayType =<< mkPReprType el_ty
252
253 return . Lam arg
254 $ Case (unwrapFamInstScrut arr_tc var_tys (Var arg))
255 (mkWildId (mkTyConApp arr_tc var_tys))
256 res_ty
257 [(DataAlt arr_dc, all_bndrs, res)]
258 where
259 var_tys = mkTyVarTys $ tyConTyVars vect_tc
260 el_ty = mkTyConApp vect_tc var_tys
261 data_cons = tyConDataCons vect_tc
262 rep_el_tys = map dataConRepArgTys data_cons
263
264 [arr_dc] = tyConDataCons arr_tc
265
266 has_selector | [_] <- data_cons = False
267 | otherwise = True
268
269
270 buildFromPRepr :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
271 buildFromPRepr _ vect_tc prepr_tc _
272 = do
273 arg_ty <- mkPReprType res_ty
274 arg <- newLocalVar FSLIT("x") arg_ty
275 alts <- mapM mk_alt data_cons
276 body <- mkFromPRepr (unwrapFamInstScrut prepr_tc var_tys (Var arg))
277 res_ty alts
278 return $ Lam arg body
279 where
280 var_tys = mkTyVarTys $ tyConTyVars vect_tc
281 res_ty = mkTyConApp vect_tc var_tys
282 data_cons = tyConDataCons vect_tc
283
284 mk_alt dc = do
285 bndrs <- mapM (newLocalVar FSLIT("x")) $ dataConRepArgTys dc
286 return (bndrs, mkConApp dc (map Type var_tys ++ map Var bndrs))
287
288 buildFromArrPRepr :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
289 buildFromArrPRepr _ vect_tc prepr_tc arr_tc
290 = mkFromArrPRepr undefined undefined undefined undefined undefined undefined
291
292 buildPRDict :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
293 buildPRDict _ vect_tc prepr_tc _
294 = prCoerce prepr_tc var_tys
295 =<< prDictOfType (mkTyConApp prepr_tc var_tys)
296 where
297 var_tys = mkTyVarTys $ tyConTyVars vect_tc
298
299 buildPArrayTyCon :: TyCon -> TyCon -> VM TyCon
300 buildPArrayTyCon orig_tc vect_tc = fixV $ \repr_tc ->
301 do
302 name' <- cloneName mkPArrayTyConOcc orig_name
303 rhs <- buildPArrayTyConRhs orig_name vect_tc repr_tc
304 parray <- builtin parrayTyCon
305
306 liftDs $ buildAlgTyCon name'
307 tyvars
308 [] -- no stupid theta
309 rhs
310 rec_flag -- FIXME: is this ok?
311 False -- FIXME: no generics
312 False -- not GADT syntax
313 (Just $ mk_fam_inst parray vect_tc)
314 where
315 orig_name = tyConName orig_tc
316 tyvars = tyConTyVars vect_tc
317 rec_flag = boolToRecFlag (isRecursiveTyCon vect_tc)
318
319
320 buildPArrayTyConRhs :: Name -> TyCon -> TyCon -> VM AlgTyConRhs
321 buildPArrayTyConRhs orig_name vect_tc repr_tc
322 = do
323 data_con <- buildPArrayDataCon orig_name vect_tc repr_tc
324 return $ DataTyCon { data_cons = [data_con], is_enum = False }
325
326 buildPArrayDataCon :: Name -> TyCon -> TyCon -> VM DataCon
327 buildPArrayDataCon orig_name vect_tc repr_tc
328 = do
329 dc_name <- cloneName mkPArrayDataConOcc orig_name
330 shape <- tyConShape vect_tc
331 repr_tys <- mapM mkPArrayType types
332
333 liftDs $ buildDataCon dc_name
334 False -- not infix
335 (shapeStrictness shape ++ map (const NotMarkedStrict) repr_tys)
336 [] -- no field labels
337 (tyConTyVars vect_tc)
338 [] -- no existentials
339 [] -- no eq spec
340 [] -- no context
341 (shapeReprTys shape ++ repr_tys)
342 repr_tc
343 where
344 types = [ty | dc <- tyConDataCons vect_tc
345 , ty <- dataConRepArgTys dc]
346
347 mkPADFun :: TyCon -> VM Var
348 mkPADFun vect_tc
349 = newExportedVar (mkPADFunOcc $ getOccName vect_tc) =<< paDFunType vect_tc
350
351 data Shape = Shape {
352 shapeReprTys :: [Type]
353 , shapeStrictness :: [StrictnessMark]
354 , shapeLength :: [CoreExpr] -> VM CoreExpr
355 , shapeReplicate :: CoreExpr -> CoreExpr -> VM [CoreExpr]
356 }
357
358 tyConShape :: TyCon -> VM Shape
359 tyConShape vect_tc
360 | isProductTyCon vect_tc
361 = return $ Shape {
362 shapeReprTys = [intPrimTy]
363 , shapeStrictness = [NotMarkedStrict]
364 , shapeLength = \[len] -> return len
365 , shapeReplicate = \len _ -> return [len]
366 }
367
368 | otherwise
369 = do
370 repr_ty <- mkPArrayType intTy -- FIXME: we want to unbox this
371 return $ Shape {
372 shapeReprTys = [repr_ty]
373 , shapeStrictness = [MarkedStrict]
374 , shapeLength = \[sel] -> lengthPA sel
375 , shapeReplicate = \len n -> do
376 e <- replicatePA len n
377 return [e]
378 }
379
380 buildTyConBindings :: TyCon -> TyCon -> TyCon -> TyCon -> Var
381 -> VM [(Var, CoreExpr)]
382 buildTyConBindings orig_tc vect_tc prepr_tc arr_tc dfun
383 = do
384 shape <- tyConShape vect_tc
385 sequence_ (zipWith4 (vectDataConWorker shape vect_tc arr_tc arr_dc)
386 orig_dcs
387 vect_dcs
388 (inits repr_tys)
389 (tails repr_tys))
390 dict <- buildPADict shape vect_tc prepr_tc arr_tc dfun
391 binds <- takeHoisted
392 return $ (dfun, dict) : binds
393 where
394 orig_dcs = tyConDataCons orig_tc
395 vect_dcs = tyConDataCons vect_tc
396 [arr_dc] = tyConDataCons arr_tc
397
398 repr_tys = map dataConRepArgTys vect_dcs
399
400 vectDataConWorker :: Shape -> TyCon -> TyCon -> DataCon
401 -> DataCon -> DataCon -> [[Type]] -> [[Type]]
402 -> VM ()
403 vectDataConWorker shape vect_tc arr_tc arr_dc orig_dc vect_dc pre (dc_tys : post)
404 = do
405 clo <- closedV
406 . inBind orig_worker
407 . polyAbstract tvs $ \abstract ->
408 liftM (abstract . vectorised)
409 $ buildClosures tvs [] dc_tys res_ty (liftM2 (,) mk_vect mk_lift)
410
411 worker <- cloneId mkVectOcc orig_worker (exprType clo)
412 hoistBinding worker clo
413 defGlobalVar orig_worker worker
414 return ()
415 where
416 tvs = tyConTyVars vect_tc
417 arg_tys = mkTyVarTys tvs
418 res_ty = mkTyConApp vect_tc arg_tys
419
420 orig_worker = dataConWorkId orig_dc
421
422 mk_vect = return . mkConApp vect_dc $ map Type arg_tys
423 mk_lift = do
424 len <- newLocalVar FSLIT("n") intPrimTy
425 arr_tys <- mapM mkPArrayType dc_tys
426 args <- mapM (newLocalVar FSLIT("xs")) arr_tys
427 shapes <- shapeReplicate shape
428 (Var len)
429 (mkDataConTag vect_dc)
430
431 empty_pre <- mapM emptyPA (concat pre)
432 empty_post <- mapM emptyPA (concat post)
433
434 return . mkLams (len : args)
435 . wrapFamInstBody arr_tc arg_tys
436 . mkConApp arr_dc
437 $ map Type arg_tys ++ shapes
438 ++ empty_pre
439 ++ map Var args
440 ++ empty_post
441
442 buildPADict :: Shape -> TyCon -> TyCon -> TyCon -> Var -> VM CoreExpr
443 buildPADict shape vect_tc prepr_tc arr_tc dfun
444 = polyAbstract tvs $ \abstract ->
445 do
446 meth_binds <- mapM (mk_method shape) paMethods
447 let meth_exprs = map (Var . fst) meth_binds
448
449 pa_dc <- builtin paDataCon
450 let dict = mkConApp pa_dc (Type (mkTyConApp vect_tc arg_tys) : meth_exprs)
451 body = Let (Rec meth_binds) dict
452 return . mkInlineMe $ abstract body
453 where
454 tvs = tyConTyVars arr_tc
455 arg_tys = mkTyVarTys tvs
456
457 mk_method shape (name, build)
458 = localV
459 $ do
460 body <- build shape vect_tc prepr_tc arr_tc
461 var <- newLocalVar name (exprType body)
462 return (var, mkInlineMe body)
463
464 paMethods = [(FSLIT("toPRepr"), buildToPRepr),
465 (FSLIT("fromPRepr"), buildFromPRepr),
466 (FSLIT("toArrPRepr"), buildToArrPRepr),
467 (FSLIT("fromArrPRepr"), buildFromArrPRepr),
468 (FSLIT("dictPRepr"), buildPRDict)]
469
470 buildLengthPA :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
471 buildLengthPA shape vect_tc _ arr_tc
472 = do
473 parr_ty <- mkPArrayType (mkTyConApp vect_tc arg_tys)
474 arg <- newLocalVar FSLIT("xs") parr_ty
475 shapes <- mapM (newLocalVar FSLIT("sh")) shape_tys
476 wilds <- mapM newDummyVar repr_tys
477 let scrut = unwrapFamInstScrut arr_tc arg_tys (Var arg)
478 scrut_ty = exprType scrut
479
480 body <- shapeLength shape (map Var shapes)
481
482 return . Lam arg
483 $ Case scrut (mkWildId scrut_ty) intPrimTy
484 [(DataAlt repr_dc, shapes ++ wilds, body)]
485 where
486 arg_tys = mkTyVarTys $ tyConTyVars arr_tc
487 [repr_dc] = tyConDataCons arr_tc
488
489 shape_tys = shapeReprTys shape
490 repr_tys = drop (length shape_tys) (dataConRepArgTys repr_dc)
491
492 -- data T = C0 t1 ... tm
493 -- ...
494 -- Ck u1 ... un
495 --
496 -- data [:T:] = A ![:Int:] [:t1:] ... [:un:]
497 --
498 -- replicatePA :: Int# -> T -> [:T:]
499 -- replicatePA n# t
500 -- = let c = case t of
501 -- C0 _ ... _ -> 0
502 -- ...
503 -- Ck _ ... _ -> k
504 --
505 -- xs1 = case t of
506 -- C0 x1 _ ... _ -> replicatePA @t1 n# x1
507 -- _ -> emptyPA @t1
508 --
509 -- ...
510 --
511 -- ysn = case t of
512 -- Ck _ ... _ yn -> replicatePA @un n# yn
513 -- _ -> emptyPA @un
514 -- in
515 -- A (replicatePA @Int n# c) xs1 ... ysn
516 --
517 --
518
519 buildReplicatePA :: Shape -> TyCon -> TyCon -> TyCon -> VM CoreExpr
520 buildReplicatePA shape vect_tc _ arr_tc
521 = do
522 len_var <- newLocalVar FSLIT("n") intPrimTy
523 val_var <- newLocalVar FSLIT("x") val_ty
524
525 let len = Var len_var
526 val = Var val_var
527
528 shape_reprs <- shapeReplicate shape len (ctr_num val)
529 reprs <- liftM concat $ mapM (mk_comp_arrs len val) vect_dcs
530
531 return . mkLams [len_var, val_var]
532 . wrapFamInstBody arr_tc arg_tys
533 $ mkConApp arr_dc (map Type arg_tys ++ shape_reprs ++ reprs)
534 where
535 arg_tys = mkTyVarTys (tyConTyVars arr_tc)
536 val_ty = mkTyConApp vect_tc arg_tys
537 wild = mkWildId val_ty
538 vect_dcs = tyConDataCons vect_tc
539 [arr_dc] = tyConDataCons arr_tc
540
541 ctr_num val = Case val wild intTy (zipWith ctr_num_alt vect_dcs [0..])
542 ctr_num_alt dc i = (DataAlt dc, map mkWildId (dataConRepArgTys dc),
543 mkConApp intDataCon [mkIntLitInt i])
544
545
546 mk_comp_arrs len val dc = let tys = dataConRepArgTys dc
547 wilds = map mkWildId tys
548 in
549 sequence (zipWith3 (mk_comp_arr len val dc)
550 tys (inits wilds) (tails wilds))
551
552 mk_comp_arr len val dc ty pre (_:post)
553 = do
554 var <- newLocalVar FSLIT("x") ty
555 rep <- replicatePA len (Var var)
556 empty <- emptyPA ty
557 arr_ty <- mkPArrayType ty
558
559 return $ Case val wild arr_ty
560 [(DEFAULT, [], empty), (DataAlt dc, pre ++ (var : post), rep)]
561
562 -- | Split the given tycons into two sets depending on whether they have to be
563 -- converted (first list) or not (second list). The first argument contains
564 -- information about the conversion status of external tycons:
565 --
566 -- * tycons which have converted versions are mapped to True
567 -- * tycons which are not changed by vectorisation are mapped to False
568 -- * tycons which can't be converted are not elements of the map
569 --
570 classifyTyCons :: UniqFM Bool -> [TyConGroup] -> ([TyCon], [TyCon])
571 classifyTyCons = classify [] []
572 where
573 classify conv keep cs [] = (conv, keep)
574 classify conv keep cs ((tcs, ds) : rs)
575 | can_convert && must_convert
576 = classify (tcs ++ conv) keep (cs `addListToUFM` [(tc,True) | tc <- tcs]) rs
577 | can_convert
578 = classify conv (tcs ++ keep) (cs `addListToUFM` [(tc,False) | tc <- tcs]) rs
579 | otherwise
580 = classify conv keep cs rs
581 where
582 refs = ds `delListFromUniqSet` tcs
583
584 can_convert = isNullUFM (refs `minusUFM` cs) && all convertable tcs
585 must_convert = foldUFM (||) False (intersectUFM_C const cs refs)
586
587 convertable tc = isDataTyCon tc && all isVanillaDataCon (tyConDataCons tc)
588
589 -- | Compute mutually recursive groups of tycons in topological order
590 --
591 tyConGroups :: [TyCon] -> [TyConGroup]
592 tyConGroups tcs = map mk_grp (stronglyConnComp edges)
593 where
594 edges = [((tc, ds), tc, uniqSetToList ds) | tc <- tcs
595 , let ds = tyConsOfTyCon tc]
596
597 mk_grp (AcyclicSCC (tc, ds)) = ([tc], ds)
598 mk_grp (CyclicSCC els) = (tcs, unionManyUniqSets dss)
599 where
600 (tcs, dss) = unzip els
601
602 tyConsOfTyCon :: TyCon -> UniqSet TyCon
603 tyConsOfTyCon
604 = tyConsOfTypes . concatMap dataConRepArgTys . tyConDataCons
605
606 tyConsOfType :: Type -> UniqSet TyCon
607 tyConsOfType ty
608 | Just ty' <- coreView ty = tyConsOfType ty'
609 tyConsOfType (TyVarTy v) = emptyUniqSet
610 tyConsOfType (TyConApp tc tys) = extend (tyConsOfTypes tys)
611 where
612 extend | isUnLiftedTyCon tc
613 || isTupleTyCon tc = id
614
615 | otherwise = (`addOneToUniqSet` tc)
616
617 tyConsOfType (AppTy a b) = tyConsOfType a `unionUniqSets` tyConsOfType b
618 tyConsOfType (FunTy a b) = (tyConsOfType a `unionUniqSets` tyConsOfType b)
619 `addOneToUniqSet` funTyCon
620 tyConsOfType (ForAllTy _ ty) = tyConsOfType ty
621 tyConsOfType other = pprPanic "ClosureConv.tyConsOfType" $ ppr other
622
623 tyConsOfTypes :: [Type] -> UniqSet TyCon
624 tyConsOfTypes = unionManyUniqSets . map tyConsOfType
625