2 collectAnnTypeBinders, collectAnnTypeArgs, isAnnTypeArg,
7 TyConRepr(..), mkTyConRepr,
8 mkToPRepr, mkToArrPRepr, mkFromPRepr, mkFromArrPRepr,
9 mkPADictType, mkPArrayType, mkPReprType,
11 parrayCoerce, parrayReprTyCon, parrayReprDataCon, mkVScrut,
12 prDictOfType, prCoerce,
13 paDictArgType, paDictOfType, paDFunType,
14 paMethod, lengthPA, replicatePA, emptyPA, liftPA,
15 polyAbstract, polyApply, polyVApply,
16 hoistBinding, hoistExpr, hoistPolyVExpr, takeHoisted,
17 buildClosure, buildClosures,
21 #include "HsVersions.h"
35 import Id ( mkWildId )
36 import MkId ( unwrapFamInstScrut )
40 import BasicTypes ( Boxity(..) )
45 import Data.List ( zipWith4 )
46 import Control.Monad ( liftM, liftM2, zipWithM_ )
48 collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
49 collectAnnTypeArgs expr = go expr []
51 go (_, AnnApp f (_, AnnType ty)) tys = go f (ty : tys)
54 collectAnnTypeBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
55 collectAnnTypeBinders expr = go [] expr
57 go bs (_, AnnLam b e) | isTyVar b = go (b:bs) e
58 go bs e = (reverse bs, e)
60 collectAnnValBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
61 collectAnnValBinders expr = go [] expr
63 go bs (_, AnnLam b e) | isId b = go (b:bs) e
64 go bs e = (reverse bs, e)
66 isAnnTypeArg :: AnnExpr b ann -> Bool
67 isAnnTypeArg (_, AnnType t) = True
68 isAnnTypeArg _ = False
70 mkDataConTag :: DataCon -> CoreExpr
71 mkDataConTag dc = mkConApp intDataCon [mkIntLitInt $ dataConTag dc]
73 splitUnTy :: String -> Name -> Type -> Type
75 | Just (tc, [ty']) <- splitTyConApp_maybe ty
76 , tyConName tc == name
79 | otherwise = pprPanic s (ppr ty)
81 splitBinTy :: String -> Name -> Type -> (Type, Type)
83 | Just (tc, [ty1, ty2]) <- splitTyConApp_maybe ty
84 , tyConName tc == name
87 | otherwise = pprPanic s (ppr ty)
89 splitFixedTyConApp :: TyCon -> Type -> [Type]
90 splitFixedTyConApp tc ty
91 | Just (tc', tys) <- splitTyConApp_maybe ty
95 | otherwise = pprPanic "splitFixedTyConApp" (ppr tc <+> ppr ty)
97 splitEmbedTy :: Type -> Type
98 splitEmbedTy = splitUnTy "splitEmbedTy" embedTyConName
100 splitClosureTy :: Type -> (Type, Type)
101 splitClosureTy = splitBinTy "splitClosureTy" closureTyConName
103 splitPArrayTy :: Type -> Type
104 splitPArrayTy = splitUnTy "splitPArrayTy" parrayTyConName
106 mkBuiltinTyConApp :: (Builtins -> TyCon) -> [Type] -> VM Type
107 mkBuiltinTyConApp get_tc tys
110 return $ mkTyConApp tc tys
112 mkBuiltinTyConApps :: (Builtins -> TyCon) -> [Type] -> Type -> VM Type
113 mkBuiltinTyConApps get_tc tys ty
116 return $ foldr (mk tc) ty tys
118 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
120 mkBuiltinTyConApps1 :: (Builtins -> TyCon) -> Type -> [Type] -> VM Type
121 mkBuiltinTyConApps1 get_tc dft [] = return dft
122 mkBuiltinTyConApps1 get_tc dft tys
126 [] -> pprPanic "mkBuiltinTyConApps1" (ppr tc)
127 _ -> return $ foldr1 (mk tc) tys
129 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
131 data TyConRepr = TyConRepr {
132 repr_tyvars :: [TyVar]
133 , repr_tys :: [[Type]]
135 , repr_embed_tys :: [[Type]]
136 , repr_prod_tycons :: [Maybe TyCon]
137 , repr_prod_tys :: [Type]
138 , repr_sum_tycon :: Maybe TyCon
142 mkTyConRepr :: TyCon -> VM TyConRepr
145 embed_tys <- mapM (mapM mkEmbedType) rep_tys
146 prod_tycons <- mapM (mk_tycon prodTyCon) rep_tys
147 sum_tycon <- mk_tycon sumTyCon rep_tys
149 let prod_tys = zipWith mk_tc_app_maybe prod_tycons embed_tys
155 , repr_embed_tys = embed_tys
156 , repr_prod_tycons = prod_tycons
157 , repr_prod_tys = prod_tys
158 , repr_sum_tycon = sum_tycon
159 , repr_type = mk_tc_app_maybe sum_tycon prod_tys
162 tyvars = tyConTyVars vect_tc
163 data_cons = tyConDataCons vect_tc
164 rep_tys = map dataConRepArgTys data_cons
167 | n > 1 = builtin (Just . get_tc n)
168 | otherwise = return Nothing
171 mk_tc_app_maybe Nothing [] = unitTy
172 mk_tc_app_maybe Nothing [ty] = ty
173 mk_tc_app_maybe (Just tc) tys = mkTyConApp tc tys
176 mkPRepr :: [[Type]] -> VM Type
179 embed_tc <- builtin embedTyCon
180 sum_tcs <- builtins sumTyCon
181 prod_tcs <- builtins prodTyCon
183 let mk_sum [] = unitTy
185 mk_sum tys = mkTyConApp (sum_tcs $ length tys) tys
189 mk_prod tys = mkTyConApp (prod_tcs $ length tys) tys
191 mk_embed ty = mkTyConApp embed_tc [ty]
194 . map (mk_prod . map mk_embed)
198 mkToPRepr :: [[CoreExpr]] -> VM ([CoreExpr], Type)
201 embed_tc <- builtin embedTyCon
202 embed_dc <- builtin embedDataCon
203 sum_tcs <- builtins sumTyCon
204 prod_tcs <- builtins prodTyCon
206 let mk_sum [] = ([Var unitDataConId], unitTy)
207 mk_sum [(expr, ty)] = ([expr], ty)
208 mk_sum es = (zipWith mk_alt (tyConDataCons sum_tc) exprs,
209 mkTyConApp sum_tc tys)
211 (exprs, tys) = unzip es
212 sum_tc = sum_tcs (length es)
213 mk_alt dc expr = mkConApp dc (map Type tys ++ [expr])
215 mk_prod [] = (Var unitDataConId, unitTy)
216 mk_prod [(expr, ty)] = (expr, ty)
217 mk_prod es = (mkConApp prod_dc (map Type tys ++ exprs),
218 mkTyConApp prod_tc tys)
220 (exprs, tys) = unzip es
221 prod_tc = prod_tcs (length es)
222 [prod_dc] = tyConDataCons prod_tc
224 mk_embed expr = (mkConApp embed_dc [Type ty, expr],
225 mkTyConApp embed_tc [ty])
226 where ty = exprType expr
228 return . mk_sum $ map (mk_prod . map mk_embed) ess
230 mkToArrPRepr :: CoreExpr -> CoreExpr -> [[CoreExpr]] -> VM CoreExpr
231 mkToArrPRepr len sel ess
233 embed_tc <- builtin embedTyCon
234 (embed_rtc, _) <- parrayReprTyCon (mkTyConApp embed_tc [unitTy])
235 let [embed_rdc] = tyConDataCons embed_rtc
237 let mk_sum [(expr, ty)] = return (expr, ty)
240 sum_tc <- builtin . sumTyCon $ length es
241 (sum_rtc, _) <- parrayReprTyCon (mkTyConApp sum_tc tys)
242 let [sum_rdc] = tyConDataCons sum_rtc
244 return (mkConApp sum_rdc (map Type tys ++ (len : sel : exprs)),
245 mkTyConApp sum_tc tys)
247 (exprs, tys) = unzip es
249 mk_prod [(expr, ty)] = return (expr, ty)
252 prod_tc <- builtin . prodTyCon $ length es
253 (prod_rtc, _) <- parrayReprTyCon (mkTyConApp prod_tc tys)
254 let [prod_rdc] = tyConDataCons prod_rtc
256 return (mkConApp prod_rdc (map Type tys ++ (len : exprs)),
257 mkTyConApp prod_tc tys)
259 (exprs, tys) = unzip es
261 mk_embed expr = (mkConApp embed_rdc [Type ty, expr],
262 mkTyConApp embed_tc [ty])
263 where ty = splitPArrayTy (exprType expr)
265 liftM fst (mk_sum =<< mapM (mk_prod . map mk_embed) ess)
267 mkFromPRepr :: CoreExpr -> Type -> [([Var], CoreExpr)] -> VM CoreExpr
268 mkFromPRepr scrut res_ty alts
270 embed_dc <- builtin embedDataCon
271 sum_tcs <- builtins sumTyCon
272 prod_tcs <- builtins prodTyCon
274 let un_sum expr ty [(vars, res)] = un_prod expr ty vars res
277 ps <- mapM (newLocalVar FSLIT("p")) tys
279 $ zipWith4 un_prod (map Var ps) tys vars rs
280 return . Case expr (mkWildId ty) res_ty
281 $ zipWith3 mk_alt sum_dcs ps bodies
283 (vars, rs) = unzip bs
284 tys = splitFixedTyConApp sum_tc ty
285 sum_tc = sum_tcs $ length bs
286 sum_dcs = tyConDataCons sum_tc
288 mk_alt dc p body = (DataAlt dc, [p], body)
290 un_prod expr ty [] r = return r
291 un_prod expr ty [var] r = return $ un_embed expr ty var r
292 un_prod expr ty vars r
294 xs <- mapM (newLocalVar FSLIT("x")) tys
295 let body = foldr (\(e,t,v) r -> un_embed e t v r) r
296 $ zip3 (map Var xs) tys vars
297 return $ Case expr (mkWildId ty) res_ty
298 [(DataAlt prod_dc, xs, body)]
300 tys = splitFixedTyConApp prod_tc ty
301 prod_tc = prod_tcs $ length vars
302 [prod_dc] = tyConDataCons prod_tc
304 un_embed expr ty var r
305 = Case expr (mkWildId ty) res_ty
306 [(DataAlt embed_dc, [var], r)]
308 un_sum scrut (exprType scrut) alts
310 mkFromArrPRepr :: CoreExpr -> Type -> Var -> Var -> [[Var]] -> CoreExpr
312 mkFromArrPRepr scrut res_ty len sel vars res
313 = return (Var unitDataConId)
315 mkEmbedType :: Type -> VM Type
316 mkEmbedType ty = mkBuiltinTyConApp embedTyCon [ty]
318 mkClosureType :: Type -> Type -> VM Type
319 mkClosureType arg_ty res_ty = mkBuiltinTyConApp closureTyCon [arg_ty, res_ty]
321 mkClosureTypes :: [Type] -> Type -> VM Type
322 mkClosureTypes = mkBuiltinTyConApps closureTyCon
324 mkPReprType :: Type -> VM Type
325 mkPReprType ty = mkBuiltinTyConApp preprTyCon [ty]
327 mkPADictType :: Type -> VM Type
328 mkPADictType ty = mkBuiltinTyConApp paTyCon [ty]
330 mkPArrayType :: Type -> VM Type
331 mkPArrayType ty = mkBuiltinTyConApp parrayTyCon [ty]
333 parrayCoerce :: TyCon -> [Type] -> CoreExpr -> VM CoreExpr
334 parrayCoerce repr_tc args expr
335 | Just arg_co <- tyConFamilyCoercion_maybe repr_tc
337 parray <- builtin parrayTyCon
339 let co = mkAppCoercion (mkTyConApp parray [])
340 (mkSymCoercion (mkTyConApp arg_co args))
342 return $ mkCoerce co expr
344 parrayReprTyCon :: Type -> VM (TyCon, [Type])
345 parrayReprTyCon ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
347 parrayReprDataCon :: Type -> VM (DataCon, [Type])
350 (tc, arg_tys) <- parrayReprTyCon ty
351 let [dc] = tyConDataCons tc
354 mkVScrut :: VExpr -> VM (VExpr, TyCon, [Type])
357 (tc, arg_tys) <- parrayReprTyCon (exprType ve)
358 return ((ve, unwrapFamInstScrut tc arg_tys le), tc, arg_tys)
360 prDictOfType :: Type -> VM CoreExpr
362 | Just (tycon, ty_args) <- splitTyConApp_maybe orig_ty
364 dfun <- traceMaybeV "prDictOfType" (ppr tycon) (lookupTyConPR tycon)
365 prDFunApply (Var dfun) ty_args
367 prDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
370 args <- mapM mkDFunArg arg_tys
371 return $ mkApps mono_dfun args
373 mono_dfun = mkTyApps dfun tys
374 (arg_tys, _) = splitFunTys (exprType mono_dfun)
376 mkDFunArg :: Type -> VM CoreExpr
378 | Just (tycon, [arg]) <- splitTyConApp_maybe ty
380 = let name = tyConName tycon
382 get_dict | name == paTyConName = paDictOfType
383 | name == prTyConName = prDictOfType
384 | otherwise = pprPanic "mkDFunArg" (ppr ty)
388 mkDFunArg ty = pprPanic "mkDFunArg" (ppr ty)
390 prCoerce :: TyCon -> [Type] -> CoreExpr -> VM CoreExpr
391 prCoerce repr_tc args expr
392 | Just arg_co <- tyConFamilyCoercion_maybe repr_tc
394 pr_tc <- builtin prTyCon
396 let co = mkAppCoercion (mkTyConApp pr_tc [])
397 (mkSymCoercion (mkTyConApp arg_co args))
399 return $ mkCoerce co expr
401 paDictArgType :: TyVar -> VM (Maybe Type)
402 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
404 go ty k | Just k' <- kindView k = go ty k'
407 tv <- newTyVar FSLIT("a") k1
408 mty1 <- go (TyVarTy tv) k1
411 mty2 <- go (AppTy ty (TyVarTy tv)) k2
412 return $ fmap (ForAllTy tv . FunTy ty1) mty2
417 = liftM Just (mkPADictType ty)
419 go ty k = return Nothing
421 paDictOfType :: Type -> VM CoreExpr
422 paDictOfType ty = paDictOfTyApp ty_fn ty_args
424 (ty_fn, ty_args) = splitAppTys ty
426 paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
427 paDictOfTyApp ty_fn ty_args
428 | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
429 paDictOfTyApp (TyVarTy tv) ty_args
431 dfun <- maybeV (lookupTyVarPA tv)
432 paDFunApply dfun ty_args
433 paDictOfTyApp (TyConApp tc _) ty_args
435 dfun <- traceMaybeV "paDictOfTyApp" (ppr tc) (lookupTyConPA tc)
436 paDFunApply (Var dfun) ty_args
437 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
439 paDFunType :: TyCon -> VM Type
442 margs <- mapM paDictArgType tvs
443 res <- mkPADictType (mkTyConApp tc arg_tys)
444 return . mkForAllTys tvs
445 $ mkFunTys [arg | Just arg <- margs] res
448 arg_tys = mkTyVarTys tvs
450 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
453 dicts <- mapM paDictOfType tys
454 return $ mkApps (mkTyApps dfun tys) dicts
456 paMethod :: (Builtins -> Var) -> Type -> VM CoreExpr
460 dict <- paDictOfType ty
461 return $ mkApps (Var fn) [Type ty, dict]
463 lengthPA :: CoreExpr -> VM CoreExpr
464 lengthPA x = liftM (`App` x) (paMethod lengthPAVar ty)
466 ty = splitPArrayTy (exprType x)
468 replicatePA :: CoreExpr -> CoreExpr -> VM CoreExpr
469 replicatePA len x = liftM (`mkApps` [len,x])
470 (paMethod replicatePAVar (exprType x))
472 emptyPA :: Type -> VM CoreExpr
473 emptyPA = paMethod emptyPAVar
475 liftPA :: CoreExpr -> VM CoreExpr
478 lc <- builtin liftingContext
479 replicatePA (Var lc) x
481 newLocalVVar :: FastString -> Type -> VM VVar
484 lty <- mkPArrayType vty
485 vv <- newLocalVar fs vty
486 lv <- newLocalVar fs lty
489 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
493 mdicts <- mapM mk_dict_var tvs
494 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
498 r <- paDictArgType tv
500 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
501 Nothing -> return Nothing
503 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
505 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
508 dicts <- mapM paDictOfType tys
509 return $ expr `mkTyApps` tys `mkApps` dicts
511 polyVApply :: VExpr -> [Type] -> VM VExpr
514 dicts <- mapM paDictOfType tys
515 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
517 hoistBinding :: Var -> CoreExpr -> VM ()
518 hoistBinding v e = updGEnv $ \env ->
519 env { global_bindings = (v,e) : global_bindings env }
521 hoistExpr :: FastString -> CoreExpr -> VM Var
524 var <- newLocalVar fs (exprType expr)
525 hoistBinding var expr
528 hoistVExpr :: VExpr -> VM VVar
532 vv <- hoistExpr ('v' `consFS` fs) ve
533 lv <- hoistExpr ('l' `consFS` fs) le
536 hoistPolyVExpr :: [TyVar] -> VM VExpr -> VM VExpr
539 expr <- closedV . polyAbstract tvs $ \abstract ->
540 liftM (mapVect abstract) p
541 fn <- hoistVExpr expr
542 polyVApply (vVar fn) (mkTyVarTys tvs)
544 takeHoisted :: VM [(Var, CoreExpr)]
548 setGEnv $ env { global_bindings = [] }
549 return $ global_bindings env
551 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
552 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
554 dict <- paDictOfType env_ty
555 mkv <- builtin mkClosureVar
556 mkl <- builtin mkClosurePVar
557 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
558 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
560 mkClosureApp :: VExpr -> VExpr -> VM VExpr
561 mkClosureApp (vclo, lclo) (varg, larg)
563 vapply <- builtin applyClosureVar
564 lapply <- builtin applyClosurePVar
565 return (Var vapply `mkTyApps` [arg_ty, res_ty] `mkApps` [vclo, varg],
566 Var lapply `mkTyApps` [arg_ty, res_ty] `mkApps` [lclo, larg])
568 (arg_ty, res_ty) = splitClosureTy (exprType vclo)
570 buildClosures :: [TyVar] -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
571 buildClosures tvs vars [] res_ty mk_body
573 buildClosures tvs vars [arg_ty] res_ty mk_body
574 = buildClosure tvs vars arg_ty res_ty mk_body
575 buildClosures tvs vars (arg_ty : arg_tys) res_ty mk_body
577 res_ty' <- mkClosureTypes arg_tys res_ty
578 arg <- newLocalVVar FSLIT("x") arg_ty
579 buildClosure tvs vars arg_ty res_ty'
582 lc <- builtin liftingContext
583 clo <- buildClosures tvs (vars ++ [arg]) arg_tys res_ty mk_body
584 return $ vLams lc (vars ++ [arg]) clo
586 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
588 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
589 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
591 buildClosure :: [TyVar] -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
592 buildClosure tvs vars arg_ty res_ty mk_body
594 (env_ty, env, bind) <- buildEnv vars
595 env_bndr <- newLocalVVar FSLIT("env") env_ty
596 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
598 fn <- hoistPolyVExpr tvs
600 lc <- builtin liftingContext
602 body' <- bind (vVar env_bndr)
603 (vVarApps lc body (vars ++ [arg_bndr]))
604 return (vLamsWithoutLC [env_bndr, arg_bndr] body')
606 mkClosure arg_ty res_ty env_ty fn env
608 buildEnv :: [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
611 lc <- builtin liftingContext
612 let (ty, venv, vbind) = mkVectEnv tys vs
613 (lenv, lbind) <- mkLiftEnv lc tys ls
614 return (ty, (venv, lenv),
615 \(venv,lenv) (vbody,lbody) ->
617 let vbody' = vbind venv vbody
618 lbody' <- lbind lenv lbody
619 return (vbody', lbody'))
624 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
625 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
626 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
627 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
628 \env body -> Case env (mkWildId ty) (exprType body)
629 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
633 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
634 mkLiftEnv lc [ty] [v]
635 = return (Var v, \env body ->
637 len <- lengthPA (Var v)
638 return . Let (NonRec v env)
639 $ Case len lc (exprType body) [(DEFAULT, [], body)])
641 -- NOTE: this transparently deals with empty environments
644 (env_tc, env_tyargs) <- parrayReprTyCon vty
645 let [env_con] = tyConDataCons env_tc
647 env = Var (dataConWrapId env_con)
648 `mkTyApps` env_tyargs
649 `mkVarApps` (lc : vs)
651 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
653 return $ Case scrut (mkWildId (exprType scrut))
655 [(DataAlt env_con, lc : bndrs, body)]
658 vty = mkCoreTupTy tys
660 bndrs | null vs = [mkWildId unitTy]