1 module VectType ( vectTyCon, vectType, vectTypeEnv,
2 PAInstance, buildPADict )
5 #include "HsVersions.h"
11 import HscTypes ( TypeEnv, extendTypeEnvList, typeEnvTyCons )
20 import FamInstEnv ( FamInst, mkLocalFamInst )
21 import InstEnv ( Instance, mkLocalInstance, instanceDFunId )
24 import BasicTypes ( StrictnessMark(..), OverlapFlag(..), boolToRecFlag )
26 import Id ( mkWildId )
27 import Name ( Name, getOccName )
29 import TysWiredIn ( unitTy, unitTyCon, intTy, intDataCon, unitDataConId )
30 import TysPrim ( intPrimTy )
35 import Digraph ( SCC(..), stronglyConnComp )
39 import Control.Monad ( liftM, liftM2, zipWithM, zipWithM_ )
40 import Data.List ( inits, tails, zipWith4, zipWith5 )
42 -- ----------------------------------------------------------------------------
45 vectTyCon :: TyCon -> VM TyCon
47 | isFunTyCon tc = builtin closureTyCon
48 | isBoxedTupleTyCon tc = return tc
49 | isUnLiftedTyCon tc = return tc
53 Just tc' -> return tc'
55 -- FIXME: just for now
56 Nothing -> pprTrace "ccTyCon:" (ppr tc) $ return tc
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 _ _)
67 mdicts <- mapM paDictArgType tyvars
68 mono_ty' <- vectType mono_ty
69 return $ tyvars `mkForAllTys` ([dict | Just dict <- mdicts] `mkFunTys` mono_ty')
71 (tyvars, mono_ty) = splitForAllTys ty
73 vectType ty = pprPanic "vectType:" (ppr ty)
75 -- ----------------------------------------------------------------------------
78 type TyConGroup = ([TyCon], UniqSet TyCon)
80 data PAInstance = PAInstance {
82 , painstOrigTyCon :: TyCon
83 , painstVectTyCon :: TyCon
84 , painstArrTyCon :: TyCon
87 vectTypeEnv :: TypeEnv -> VM (TypeEnv, [FamInst], [(Var, CoreExpr)])
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
97 let orig_tcs = keep_tcs ++ conv_tcs
98 vect_tcs = keep_tcs ++ new_tcs
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
110 let all_new_tcs = new_tcs ++ repr_tcs ++ parr_tcs
112 let new_env = extendTypeEnvList env
113 (map ATyCon all_new_tcs
114 ++ [ADataCon dc | tc <- all_new_tcs
115 , dc <- tyConDataCons tc])
117 return (new_env, map mkLocalFamInst (repr_tcs ++ parr_tcs), concat binds)
119 tycons = typeEnvTyCons env
120 groups = tyConGroups tycons
122 mk_map env = listToUFM_Directly [(u, getUnique n /= u) | (u,n) <- nameEnvUniqueElts env]
124 keep_tc tc = let dcs = tyConDataCons tc
126 defTyCon tc tc >> zipWithM_ defDataCon dcs dcs
129 vectTyConDecls :: [TyCon] -> VM [TyCon]
130 vectTyConDecls tcs = fixV $ \tcs' ->
132 mapM_ (uncurry defTyCon) (lazy_zip tcs tcs')
133 mapM vectTyConDecl tcs
136 lazy_zip (x:xs) ~(y:ys) = (x,y) : lazy_zip xs ys
138 vectTyConDecl :: TyCon -> VM TyCon
141 name' <- cloneName mkVectTyConOcc name
142 rhs' <- vectAlgTyConRhs (algTyConRhs tc)
144 liftDs $ buildAlgTyCon name'
146 [] -- no stupid theta
148 rec_flag -- FIXME: is this ok?
149 False -- FIXME: no generics
150 False -- not GADT syntax
151 Nothing -- not a family instance
154 tyvars = tyConTyVars tc
155 rec_flag = boolToRecFlag (isRecursiveTyCon tc)
157 vectAlgTyConRhs :: AlgTyConRhs -> VM AlgTyConRhs
158 vectAlgTyConRhs (DataTyCon { data_cons = data_cons
162 data_cons' <- mapM vectDataCon data_cons
163 zipWithM_ defDataCon data_cons data_cons'
164 return $ DataTyCon { data_cons = data_cons'
168 vectDataCon :: DataCon -> VM DataCon
170 | not . null $ dataConExTyVars dc = pprPanic "vectDataCon: existentials" (ppr dc)
171 | not . null $ dataConEqSpec dc = pprPanic "vectDataCon: eq spec" (ppr dc)
174 name' <- cloneName mkVectDataConOcc name
175 tycon' <- vectTyCon tycon
176 arg_tys <- mapM vectType rep_arg_tys
178 liftDs $ buildDataCon name'
180 (map (const NotMarkedStrict) arg_tys)
181 [] -- no labelled fields
183 [] -- no existential tvs for now
184 [] -- no eq spec for now
189 name = dataConName dc
190 univ_tvs = dataConUnivTyVars dc
191 rep_arg_tys = dataConRepArgTys dc
192 tycon = dataConTyCon dc
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])
198 buildPReprTyCon :: TyCon -> TyCon -> VM TyCon
199 buildPReprTyCon orig_tc vect_tc
201 name <- cloneName mkPReprTyConOcc (tyConName orig_tc)
202 rhs_ty <- buildPReprType vect_tc
203 prepr_tc <- builtin preprTyCon
204 liftDs $ buildSynTyCon name
206 (SynonymTyCon rhs_ty)
207 (Just $ mk_fam_inst prepr_tc vect_tc)
209 tyvars = tyConTyVars vect_tc
211 data TyConRepr = ProdRepr {
212 repr_prod_arg_tys :: [Type]
213 , repr_prod_tycon :: TyCon
214 , repr_prod_data_con :: DataCon
219 , repr_prod_tycons :: [Maybe TyCon]
220 , repr_prod_data_cons :: [Maybe DataCon]
221 , repr_prod_tys :: [Type]
222 , repr_sum_tycon :: TyCon
226 arrShapeTys :: TyConRepr -> VM [Type]
227 arrShapeTys (ProdRepr {}) = return [intPrimTy]
228 arrShapeTys (SumRepr {})
230 uarr <- builtin uarrTyCon
231 return [intPrimTy, mkTyConApp uarr [intTy]]
233 arrReprTys :: TyConRepr -> VM [Type]
234 arrReprTys (ProdRepr { repr_prod_arg_tys = tys })
235 = mapM mkPArrayType tys
236 arrReprTys (SumRepr { repr_tys = tys })
237 = concat `liftM` mapM (mapM mkPArrayType) (map mk_prod tys)
239 mk_prod [] = [unitTy]
243 mkTyConRepr :: TyCon -> VM TyConRepr
247 [prod_arg_tys] = repr_tys
250 prod_tycon <- builtin (prodTyCon $ length prod_arg_tys)
251 let [prod_data_con] = tyConDataCons prod_tycon
254 repr_prod_arg_tys = prod_arg_tys
255 , repr_prod_tycon = prod_tycon
256 , repr_prod_data_con = prod_data_con
257 , repr_type = mkTyConApp prod_tycon prod_arg_tys
262 uarr <- builtin uarrTyCon
263 prod_tycons <- mapM (mk_tycon prodTyCon) repr_tys
264 let prod_tys = zipWith mk_tc_app_maybe prod_tycons repr_tys
265 sum_tycon <- builtin (sumTyCon $ length repr_tys)
266 arr_repr_tys <- mapM (mapM mkPArrayType . arr_repr_elem_tys) repr_tys
270 , repr_prod_tycons = prod_tycons
271 , repr_prod_data_cons = map (fmap mk_single_datacon) prod_tycons
272 , repr_prod_tys = prod_tys
273 , repr_sum_tycon = sum_tycon
274 , repr_type = mkTyConApp sum_tycon prod_tys
277 tyvars = tyConTyVars vect_tc
278 data_cons = tyConDataCons vect_tc
279 repr_tys = map dataConRepArgTys data_cons
281 is_product | [_] <- data_cons = True
284 mk_shape uarr = intPrimTy : mk_sel uarr
286 mk_sel uarr | is_product = []
287 | otherwise = [uarr_int, uarr_int]
289 uarr_int = mkTyConApp uarr [intTy]
292 | n > 1 = builtin (Just . get_tc n)
293 | otherwise = return Nothing
296 mk_single_datacon tc | [dc] <- tyConDataCons tc = dc
298 mk_tc_app_maybe Nothing [] = unitTy
299 mk_tc_app_maybe Nothing [ty] = ty
300 mk_tc_app_maybe (Just tc) tys = mkTyConApp tc tys
302 arr_repr_elem_tys [] = [unitTy]
303 arr_repr_elem_tys tys = tys
305 buildPReprType :: TyCon -> VM Type
306 buildPReprType = liftM repr_type . mkTyConRepr
308 buildToPRepr :: TyConRepr -> TyCon -> TyCon -> TyCon -> VM CoreExpr
309 buildToPRepr (ProdRepr {
310 repr_prod_arg_tys = prod_arg_tys
311 , repr_prod_data_con = prod_data_con
312 , repr_type = repr_type
316 arg <- newLocalVar FSLIT("x") arg_ty
317 vars <- mapM (newLocalVar FSLIT("x")) prod_arg_tys
320 . wrapFamInstBody prepr_tc var_tys
321 $ Case (Var arg) (mkWildId arg_ty) repr_type
322 [(DataAlt data_con, vars,
323 mkConApp prod_data_con (map Type prod_arg_tys ++ map Var vars))]
325 var_tys = mkTyVarTys $ tyConTyVars vect_tc
326 arg_ty = mkTyConApp vect_tc var_tys
327 [data_con] = tyConDataCons vect_tc
329 buildToPRepr (SumRepr {
331 , repr_prod_data_cons = prod_data_cons
332 , repr_prod_tys = prod_tys
333 , repr_sum_tycon = sum_tycon
334 , repr_type = repr_type
338 arg <- newLocalVar FSLIT("x") arg_ty
339 vars <- mapM (mapM (newLocalVar FSLIT("x"))) repr_tys
342 . wrapFamInstBody prepr_tc var_tys
343 . Case (Var arg) (mkWildId arg_ty) repr_type
344 . zipWith4 mk_alt data_cons vars sum_data_cons
345 . zipWith3 mk_prod prod_data_cons repr_tys $ map (map Var) vars
347 var_tys = mkTyVarTys $ tyConTyVars vect_tc
348 arg_ty = mkTyConApp vect_tc var_tys
349 data_cons = tyConDataCons vect_tc
351 sum_data_cons = tyConDataCons sum_tycon
353 mk_alt dc vars sum_dc expr = (DataAlt dc, vars,
354 mkConApp sum_dc (map Type prod_tys ++ [expr]))
356 mk_prod _ _ [] = Var unitDataConId
357 mk_prod _ _ [expr] = expr
358 mk_prod (Just dc) tys exprs = mkConApp dc (map Type tys ++ exprs)
360 buildFromPRepr :: TyConRepr -> TyCon -> TyCon -> TyCon -> VM CoreExpr
361 buildFromPRepr (ProdRepr {
362 repr_prod_arg_tys = prod_arg_tys
363 , repr_prod_data_con = prod_data_con
364 , repr_type = repr_type
368 arg_ty <- mkPReprType res_ty
369 arg <- newLocalVar FSLIT("x") arg_ty
370 vars <- mapM (newLocalVar FSLIT("x")) prod_arg_tys
373 $ Case (unwrapFamInstScrut prepr_tc var_tys (Var arg))
376 [(DataAlt prod_data_con, vars,
377 mkConApp data_con (map Type var_tys ++ map Var vars))]
379 var_tys = mkTyVarTys $ tyConTyVars vect_tc
380 ty_args = map Type var_tys
381 res_ty = mkTyConApp vect_tc var_tys
382 [data_con] = tyConDataCons vect_tc
384 buildFromPRepr (SumRepr {
386 , repr_prod_data_cons = prod_data_cons
387 , repr_prod_tys = prod_tys
388 , repr_sum_tycon = sum_tycon
389 , repr_type = repr_type
393 arg_ty <- mkPReprType res_ty
394 arg <- newLocalVar FSLIT("x") arg_ty
397 . Case (unwrapFamInstScrut prepr_tc var_tys (Var arg))
400 . zipWith mk_alt sum_data_cons)
402 $ zipWith4 un_prod data_cons prod_data_cons prod_tys repr_tys)
404 var_tys = mkTyVarTys $ tyConTyVars vect_tc
405 ty_args = map Type var_tys
406 res_ty = mkTyConApp vect_tc var_tys
407 data_cons = tyConDataCons vect_tc
409 sum_data_cons = tyConDataCons sum_tycon
413 var <- newLocalVar FSLIT("u") unitTy
414 return (var, mkConApp dc ty_args)
417 var <- newLocalVar FSLIT("x") ty
418 return (var, mkConApp dc (ty_args ++ [Var var]))
420 un_prod dc (Just prod_dc) prod_ty tys
422 vars <- mapM (newLocalVar FSLIT("x")) tys
423 pv <- newLocalVar FSLIT("p") prod_ty
425 let res = mkConApp dc (ty_args ++ map Var vars)
426 expr = Case (Var pv) (mkWildId prod_ty) res_ty
427 [(DataAlt prod_dc, vars, res)]
431 mk_alt sum_dc (var, expr) = (DataAlt sum_dc, [var], expr)
434 buildToArrPRepr :: TyConRepr -> TyCon -> TyCon -> TyCon -> VM CoreExpr
436 buildToArrPRepr (ProdRepr {
437 repr_prod_arg_tys = prod_arg_tys
438 , repr_prod_data_con = prod_data_con
439 , repr_type = repr_type
443 arg_ty <- mkPArratType el_ty
444 rep_tys <- mapM mkPArrayType prod_arg_tys
448 var_tys = mkTyVarTys $ tyConTyVars vect_tc
449 el_ty = mkTyConApp vect_tc var_tys
451 buildToArrPRepr _ _ _ _ = return (Var unitDataConId)
453 buildToArrPRepr _ vect_tc prepr_tc arr_tc
455 arg_ty <- mkPArrayType el_ty
456 rep_tys <- mapM (mapM mkPArrayType) rep_el_tys
458 arg <- newLocalVar FSLIT("xs") arg_ty
459 bndrss <- mapM (mapM (newLocalVar FSLIT("ys"))) rep_tys
460 len <- newLocalVar FSLIT("len") intPrimTy
461 sel <- newLocalVar FSLIT("sel") =<< mkPArrayType intTy
463 let add_sel xs | has_selector = sel : xs
466 all_bndrs = len : add_sel (concat bndrss)
468 res <- parrayCoerce prepr_tc var_tys
469 =<< mkToArrPRepr (Var len) (Var sel) (map (map Var) bndrss)
470 res_ty <- mkPArrayType =<< mkPReprType el_ty
473 $ Case (unwrapFamInstScrut arr_tc var_tys (Var arg))
474 (mkWildId (mkTyConApp arr_tc var_tys))
476 [(DataAlt arr_dc, all_bndrs, res)]
478 var_tys = mkTyVarTys $ tyConTyVars vect_tc
479 el_ty = mkTyConApp vect_tc var_tys
480 data_cons = tyConDataCons vect_tc
481 rep_el_tys = map dataConRepArgTys data_cons
483 [arr_dc] = tyConDataCons arr_tc
485 has_selector | [_] <- data_cons = False
489 buildFromArrPRepr :: TyConRepr -> TyCon -> TyCon -> TyCon -> VM CoreExpr
490 buildFromArrPRepr _ _ _ _ = return (Var unitDataConId)
492 buildPRDict :: TyConRepr -> TyCon -> TyCon -> TyCon -> VM CoreExpr
493 buildPRDict (ProdRepr {
494 repr_prod_arg_tys = prod_arg_tys
495 , repr_prod_tycon = prod_tycon
499 prs <- mapM mkPR prod_arg_tys
500 dfun <- prDFunOfTyCon prod_tycon
501 return $ dfun `mkTyApps` prod_arg_tys `mkApps` prs
503 buildPRDict (SumRepr {
505 , repr_prod_tycons = prod_tycons
506 , repr_prod_tys = prod_tys
507 , repr_sum_tycon = sum_tycon
511 prs <- mapM (mapM mkPR) repr_tys
512 prod_prs <- sequence $ zipWith3 mk_prod_pr prod_tycons repr_tys prs
513 sum_dfun <- prDFunOfTyCon sum_tycon
514 prCoerce prepr_tc var_tys
515 $ sum_dfun `mkTyApps` prod_tys `mkApps` prod_prs
517 var_tys = mkTyVarTys $ tyConTyVars vect_tc
519 mk_prod_pr _ _ [] = prDFunOfTyCon unitTyCon
520 mk_prod_pr _ _ [pr] = return pr
521 mk_prod_pr (Just tc) tys prs
523 dfun <- prDFunOfTyCon tc
524 return $ dfun `mkTyApps` tys `mkApps` prs
526 buildPArrayTyCon :: TyCon -> TyCon -> VM TyCon
527 buildPArrayTyCon orig_tc vect_tc = fixV $ \repr_tc ->
529 name' <- cloneName mkPArrayTyConOcc orig_name
530 rhs <- buildPArrayTyConRhs orig_name vect_tc repr_tc
531 parray <- builtin parrayTyCon
533 liftDs $ buildAlgTyCon name'
535 [] -- no stupid theta
537 rec_flag -- FIXME: is this ok?
538 False -- FIXME: no generics
539 False -- not GADT syntax
540 (Just $ mk_fam_inst parray vect_tc)
542 orig_name = tyConName orig_tc
543 tyvars = tyConTyVars vect_tc
544 rec_flag = boolToRecFlag (isRecursiveTyCon vect_tc)
547 buildPArrayTyConRhs :: Name -> TyCon -> TyCon -> VM AlgTyConRhs
548 buildPArrayTyConRhs orig_name vect_tc repr_tc
550 data_con <- buildPArrayDataCon orig_name vect_tc repr_tc
551 return $ DataTyCon { data_cons = [data_con], is_enum = False }
553 buildPArrayDataCon :: Name -> TyCon -> TyCon -> VM DataCon
554 buildPArrayDataCon orig_name vect_tc repr_tc
556 dc_name <- cloneName mkPArrayDataConOcc orig_name
557 repr <- mkTyConRepr vect_tc
559 shape_tys <- arrShapeTys repr
560 repr_tys <- arrReprTys repr
562 let tys = shape_tys ++ repr_tys
564 liftDs $ buildDataCon dc_name
566 (map (const NotMarkedStrict) tys)
567 [] -- no field labels
568 (tyConTyVars vect_tc)
569 [] -- no existentials
575 mkPADFun :: TyCon -> VM Var
577 = newExportedVar (mkPADFunOcc $ getOccName vect_tc) =<< paDFunType vect_tc
580 shapeReprTys :: [Type]
581 , shapeStrictness :: [StrictnessMark]
582 , shapeLength :: [CoreExpr] -> VM CoreExpr
583 , shapeReplicate :: CoreExpr -> CoreExpr -> VM [CoreExpr]
586 tyConShape :: TyCon -> VM Shape
588 | isProductTyCon vect_tc
590 shapeReprTys = [intPrimTy]
591 , shapeStrictness = [NotMarkedStrict]
592 , shapeLength = \[len] -> return len
593 , shapeReplicate = \len _ -> return [len]
598 repr_ty <- mkPArrayType intTy -- FIXME: we want to unbox this
600 shapeReprTys = [repr_ty]
601 , shapeStrictness = [MarkedStrict]
602 , shapeLength = \[sel] -> lengthPA sel
603 , shapeReplicate = \len n -> do
604 e <- replicatePA len n
608 buildTyConBindings :: TyCon -> TyCon -> TyCon -> TyCon -> Var
609 -> VM [(Var, CoreExpr)]
610 buildTyConBindings orig_tc vect_tc prepr_tc arr_tc dfun
612 shape <- tyConShape vect_tc
613 repr <- mkTyConRepr vect_tc
614 sequence_ (zipWith4 (vectDataConWorker shape vect_tc arr_tc arr_dc)
619 dict <- buildPADict repr vect_tc prepr_tc arr_tc dfun
621 return $ (dfun, dict) : binds
623 orig_dcs = tyConDataCons orig_tc
624 vect_dcs = tyConDataCons vect_tc
625 [arr_dc] = tyConDataCons arr_tc
627 repr_tys = map dataConRepArgTys vect_dcs
629 vectDataConWorker :: Shape -> TyCon -> TyCon -> DataCon
630 -> DataCon -> DataCon -> [[Type]] -> [[Type]]
632 vectDataConWorker shape vect_tc arr_tc arr_dc orig_dc vect_dc pre (dc_tys : post)
636 . polyAbstract tvs $ \abstract ->
637 liftM (abstract . vectorised)
638 $ buildClosures tvs [] dc_tys res_ty (liftM2 (,) mk_vect mk_lift)
640 worker <- cloneId mkVectOcc orig_worker (exprType clo)
641 hoistBinding worker clo
642 defGlobalVar orig_worker worker
645 tvs = tyConTyVars vect_tc
646 arg_tys = mkTyVarTys tvs
647 res_ty = mkTyConApp vect_tc arg_tys
649 orig_worker = dataConWorkId orig_dc
651 mk_vect = return . mkConApp vect_dc $ map Type arg_tys
653 len <- newLocalVar FSLIT("n") intPrimTy
654 arr_tys <- mapM mkPArrayType dc_tys
655 args <- mapM (newLocalVar FSLIT("xs")) arr_tys
656 shapes <- shapeReplicate shape
658 (mkDataConTag vect_dc)
660 empty_pre <- mapM emptyPA (concat pre)
661 empty_post <- mapM emptyPA (concat post)
663 return . mkLams (len : args)
664 . wrapFamInstBody arr_tc arg_tys
666 $ map Type arg_tys ++ shapes
671 buildPADict :: TyConRepr -> TyCon -> TyCon -> TyCon -> Var -> VM CoreExpr
672 buildPADict repr vect_tc prepr_tc arr_tc dfun
673 = polyAbstract tvs $ \abstract ->
675 meth_binds <- mapM (mk_method repr) paMethods
676 let meth_exprs = map (Var . fst) meth_binds
678 pa_dc <- builtin paDataCon
679 let dict = mkConApp pa_dc (Type (mkTyConApp vect_tc arg_tys) : meth_exprs)
680 body = Let (Rec meth_binds) dict
681 return . mkInlineMe $ abstract body
683 tvs = tyConTyVars arr_tc
684 arg_tys = mkTyVarTys tvs
686 mk_method repr (name, build)
689 body <- build repr vect_tc prepr_tc arr_tc
690 var <- newLocalVar name (exprType body)
691 return (var, mkInlineMe body)
693 paMethods = [(FSLIT("toPRepr"), buildToPRepr),
694 (FSLIT("fromPRepr"), buildFromPRepr),
695 (FSLIT("toArrPRepr"), buildToArrPRepr),
696 (FSLIT("fromArrPRepr"), buildFromArrPRepr),
697 (FSLIT("dictPRepr"), buildPRDict)]
699 -- | Split the given tycons into two sets depending on whether they have to be
700 -- converted (first list) or not (second list). The first argument contains
701 -- information about the conversion status of external tycons:
703 -- * tycons which have converted versions are mapped to True
704 -- * tycons which are not changed by vectorisation are mapped to False
705 -- * tycons which can't be converted are not elements of the map
707 classifyTyCons :: UniqFM Bool -> [TyConGroup] -> ([TyCon], [TyCon])
708 classifyTyCons = classify [] []
710 classify conv keep cs [] = (conv, keep)
711 classify conv keep cs ((tcs, ds) : rs)
712 | can_convert && must_convert
713 = classify (tcs ++ conv) keep (cs `addListToUFM` [(tc,True) | tc <- tcs]) rs
715 = classify conv (tcs ++ keep) (cs `addListToUFM` [(tc,False) | tc <- tcs]) rs
717 = classify conv keep cs rs
719 refs = ds `delListFromUniqSet` tcs
721 can_convert = isNullUFM (refs `minusUFM` cs) && all convertable tcs
722 must_convert = foldUFM (||) False (intersectUFM_C const cs refs)
724 convertable tc = isDataTyCon tc && all isVanillaDataCon (tyConDataCons tc)
726 -- | Compute mutually recursive groups of tycons in topological order
728 tyConGroups :: [TyCon] -> [TyConGroup]
729 tyConGroups tcs = map mk_grp (stronglyConnComp edges)
731 edges = [((tc, ds), tc, uniqSetToList ds) | tc <- tcs
732 , let ds = tyConsOfTyCon tc]
734 mk_grp (AcyclicSCC (tc, ds)) = ([tc], ds)
735 mk_grp (CyclicSCC els) = (tcs, unionManyUniqSets dss)
737 (tcs, dss) = unzip els
739 tyConsOfTyCon :: TyCon -> UniqSet TyCon
741 = tyConsOfTypes . concatMap dataConRepArgTys . tyConDataCons
743 tyConsOfType :: Type -> UniqSet TyCon
745 | Just ty' <- coreView ty = tyConsOfType ty'
746 tyConsOfType (TyVarTy v) = emptyUniqSet
747 tyConsOfType (TyConApp tc tys) = extend (tyConsOfTypes tys)
749 extend | isUnLiftedTyCon tc
750 || isTupleTyCon tc = id
752 | otherwise = (`addOneToUniqSet` tc)
754 tyConsOfType (AppTy a b) = tyConsOfType a `unionUniqSets` tyConsOfType b
755 tyConsOfType (FunTy a b) = (tyConsOfType a `unionUniqSets` tyConsOfType b)
756 `addOneToUniqSet` funTyCon
757 tyConsOfType (ForAllTy _ ty) = tyConsOfType ty
758 tyConsOfType other = pprPanic "ClosureConv.tyConsOfType" $ ppr other
760 tyConsOfTypes :: [Type] -> UniqSet TyCon
761 tyConsOfTypes = unionManyUniqSets . map tyConsOfType