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 splitClosureTy :: Type -> (Type, Type)
98 splitClosureTy = splitBinTy "splitClosureTy" closureTyConName
100 splitPArrayTy :: Type -> Type
101 splitPArrayTy = splitUnTy "splitPArrayTy" parrayTyConName
103 mkBuiltinTyConApp :: (Builtins -> TyCon) -> [Type] -> VM Type
104 mkBuiltinTyConApp get_tc tys
107 return $ mkTyConApp tc tys
109 mkBuiltinTyConApps :: (Builtins -> TyCon) -> [Type] -> Type -> VM Type
110 mkBuiltinTyConApps get_tc tys ty
113 return $ foldr (mk tc) ty tys
115 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
117 mkBuiltinTyConApps1 :: (Builtins -> TyCon) -> Type -> [Type] -> VM Type
118 mkBuiltinTyConApps1 get_tc dft [] = return dft
119 mkBuiltinTyConApps1 get_tc dft tys
123 [] -> pprPanic "mkBuiltinTyConApps1" (ppr tc)
124 _ -> return $ foldr1 (mk tc) tys
126 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
128 data TyConRepr = TyConRepr {
129 repr_tyvars :: [TyVar]
130 , repr_tys :: [[Type]]
132 , repr_prod_tycons :: [Maybe TyCon]
133 , repr_prod_tys :: [Type]
134 , repr_sum_tycon :: Maybe TyCon
138 mkTyConRepr :: TyCon -> VM TyConRepr
141 prod_tycons <- mapM (mk_tycon prodTyCon) rep_tys
142 let prod_tys = zipWith mk_tc_app_maybe prod_tycons rep_tys
143 sum_tycon <- mk_tycon sumTyCon prod_tys
149 , repr_prod_tycons = prod_tycons
150 , repr_prod_tys = prod_tys
151 , repr_sum_tycon = sum_tycon
152 , repr_type = mk_tc_app_maybe sum_tycon prod_tys
155 tyvars = tyConTyVars vect_tc
156 data_cons = tyConDataCons vect_tc
157 rep_tys = map dataConRepArgTys data_cons
160 | n > 1 = builtin (Just . get_tc n)
161 | otherwise = return Nothing
164 mk_tc_app_maybe Nothing [] = unitTy
165 mk_tc_app_maybe Nothing [ty] = ty
166 mk_tc_app_maybe (Just tc) tys = mkTyConApp tc tys
169 mkPRepr :: [[Type]] -> VM Type
172 embed_tc <- builtin embedTyCon
173 sum_tcs <- builtins sumTyCon
174 prod_tcs <- builtins prodTyCon
176 let mk_sum [] = unitTy
178 mk_sum tys = mkTyConApp (sum_tcs $ length tys) tys
182 mk_prod tys = mkTyConApp (prod_tcs $ length tys) tys
184 mk_embed ty = mkTyConApp embed_tc [ty]
187 . map (mk_prod . map mk_embed)
191 mkToPRepr :: TyConRepr -> [[CoreExpr]] -> [CoreExpr]
192 mkToPRepr (TyConRepr {
194 , repr_prod_tycons = prod_tycons
195 , repr_prod_tys = prod_tys
196 , repr_sum_tycon = repr_sum_tycon
198 = mk_sum . zipWith3 mk_prod prod_tycons repr_tys
200 Just sum_tycon = repr_sum_tycon
202 mk_sum [] = [Var unitDataConId]
203 mk_sum [expr] = [expr]
204 mk_sum exprs = zipWith (mk_alt prod_tys) (tyConDataCons sum_tycon) exprs
206 mk_alt tys dc expr = mk_con_app dc tys [expr]
208 mk_prod _ _ [] = Var unitDataConId
209 mk_prod _ _ [expr] = expr
210 mk_prod (Just tc) tys exprs = mk_con_app dc tys exprs
212 [dc] = tyConDataCons tc
214 mk_con_app dc tys exprs = mkConApp dc (map Type tys ++ exprs)
216 mkToArrPRepr :: CoreExpr -> CoreExpr -> [[CoreExpr]] -> VM CoreExpr
217 mkToArrPRepr len sel ess
219 let mk_sum [(expr, ty)] = return (expr, ty)
222 sum_tc <- builtin . sumTyCon $ length es
223 (sum_rtc, _) <- parrayReprTyCon (mkTyConApp sum_tc tys)
224 let [sum_rdc] = tyConDataCons sum_rtc
226 return (mkConApp sum_rdc (map Type tys ++ (len : sel : exprs)),
227 mkTyConApp sum_tc tys)
229 (exprs, tys) = unzip es
231 mk_prod [expr] = return (expr, splitPArrayTy (exprType expr))
234 prod_tc <- builtin . prodTyCon $ length exprs
235 (prod_rtc, _) <- parrayReprTyCon (mkTyConApp prod_tc tys)
236 let [prod_rdc] = tyConDataCons prod_rtc
238 return (mkConApp prod_rdc (map Type tys ++ (len : exprs)),
239 mkTyConApp prod_tc tys)
241 tys = map (splitPArrayTy . exprType) exprs
243 liftM fst (mk_sum =<< mapM mk_prod ess)
245 mkFromPRepr :: CoreExpr -> Type -> [([Var], CoreExpr)] -> VM CoreExpr
246 mkFromPRepr scrut res_ty alts
248 sum_tcs <- builtins sumTyCon
249 prod_tcs <- builtins prodTyCon
251 let un_sum expr ty [(vars, res)] = un_prod expr ty vars res
254 ps <- mapM (newLocalVar FSLIT("p")) tys
256 $ zipWith4 un_prod (map Var ps) tys vars rs
257 return . Case expr (mkWildId ty) res_ty
258 $ zipWith3 mk_alt sum_dcs ps bodies
260 (vars, rs) = unzip bs
261 tys = splitFixedTyConApp sum_tc ty
262 sum_tc = sum_tcs $ length bs
263 sum_dcs = tyConDataCons sum_tc
265 mk_alt dc p body = (DataAlt dc, [p], body)
267 un_prod expr ty [] r = return r
268 un_prod expr ty [var] r = return $ Let (NonRec var expr) r
269 un_prod expr ty vars r
270 = return $ Case expr (mkWildId ty) res_ty
271 [(DataAlt prod_dc, vars, r)]
273 prod_tc = prod_tcs $ length vars
274 [prod_dc] = tyConDataCons prod_tc
276 un_sum scrut (exprType scrut) alts
278 mkFromArrPRepr :: CoreExpr -> Type -> Var -> Var -> [[Var]] -> CoreExpr
280 mkFromArrPRepr scrut res_ty len sel vars res
281 = return (Var unitDataConId)
283 mkClosureType :: Type -> Type -> VM Type
284 mkClosureType arg_ty res_ty = mkBuiltinTyConApp closureTyCon [arg_ty, res_ty]
286 mkClosureTypes :: [Type] -> Type -> VM Type
287 mkClosureTypes = mkBuiltinTyConApps closureTyCon
289 mkPReprType :: Type -> VM Type
290 mkPReprType ty = mkBuiltinTyConApp preprTyCon [ty]
292 mkPADictType :: Type -> VM Type
293 mkPADictType ty = mkBuiltinTyConApp paTyCon [ty]
295 mkPArrayType :: Type -> VM Type
296 mkPArrayType ty = mkBuiltinTyConApp parrayTyCon [ty]
298 parrayCoerce :: TyCon -> [Type] -> CoreExpr -> VM CoreExpr
299 parrayCoerce repr_tc args expr
300 | Just arg_co <- tyConFamilyCoercion_maybe repr_tc
302 parray <- builtin parrayTyCon
304 let co = mkAppCoercion (mkTyConApp parray [])
305 (mkSymCoercion (mkTyConApp arg_co args))
307 return $ mkCoerce co expr
309 parrayReprTyCon :: Type -> VM (TyCon, [Type])
310 parrayReprTyCon ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
312 parrayReprDataCon :: Type -> VM (DataCon, [Type])
315 (tc, arg_tys) <- parrayReprTyCon ty
316 let [dc] = tyConDataCons tc
319 mkVScrut :: VExpr -> VM (VExpr, TyCon, [Type])
322 (tc, arg_tys) <- parrayReprTyCon (exprType ve)
323 return ((ve, unwrapFamInstScrut tc arg_tys le), tc, arg_tys)
325 prDictOfType :: Type -> VM CoreExpr
327 | Just (tycon, ty_args) <- splitTyConApp_maybe orig_ty
329 dfun <- traceMaybeV "prDictOfType" (ppr tycon) (lookupTyConPR tycon)
330 prDFunApply (Var dfun) ty_args
332 prDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
335 args <- mapM mkDFunArg arg_tys
336 return $ mkApps mono_dfun args
338 mono_dfun = mkTyApps dfun tys
339 (arg_tys, _) = splitFunTys (exprType mono_dfun)
341 mkDFunArg :: Type -> VM CoreExpr
343 | Just (tycon, [arg]) <- splitTyConApp_maybe ty
345 = let name = tyConName tycon
347 get_dict | name == paTyConName = paDictOfType
348 | name == prTyConName = prDictOfType
349 | otherwise = pprPanic "mkDFunArg" (ppr ty)
353 mkDFunArg ty = pprPanic "mkDFunArg" (ppr ty)
355 prCoerce :: TyCon -> [Type] -> CoreExpr -> VM CoreExpr
356 prCoerce repr_tc args expr
357 | Just arg_co <- tyConFamilyCoercion_maybe repr_tc
359 pr_tc <- builtin prTyCon
361 let co = mkAppCoercion (mkTyConApp pr_tc [])
362 (mkSymCoercion (mkTyConApp arg_co args))
364 return $ mkCoerce co expr
366 paDictArgType :: TyVar -> VM (Maybe Type)
367 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
369 go ty k | Just k' <- kindView k = go ty k'
372 tv <- newTyVar FSLIT("a") k1
373 mty1 <- go (TyVarTy tv) k1
376 mty2 <- go (AppTy ty (TyVarTy tv)) k2
377 return $ fmap (ForAllTy tv . FunTy ty1) mty2
382 = liftM Just (mkPADictType ty)
384 go ty k = return Nothing
386 paDictOfType :: Type -> VM CoreExpr
387 paDictOfType ty = paDictOfTyApp ty_fn ty_args
389 (ty_fn, ty_args) = splitAppTys ty
391 paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
392 paDictOfTyApp ty_fn ty_args
393 | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
394 paDictOfTyApp (TyVarTy tv) ty_args
396 dfun <- maybeV (lookupTyVarPA tv)
397 paDFunApply dfun ty_args
398 paDictOfTyApp (TyConApp tc _) ty_args
400 dfun <- traceMaybeV "paDictOfTyApp" (ppr tc) (lookupTyConPA tc)
401 paDFunApply (Var dfun) ty_args
402 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
404 paDFunType :: TyCon -> VM Type
407 margs <- mapM paDictArgType tvs
408 res <- mkPADictType (mkTyConApp tc arg_tys)
409 return . mkForAllTys tvs
410 $ mkFunTys [arg | Just arg <- margs] res
413 arg_tys = mkTyVarTys tvs
415 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
418 dicts <- mapM paDictOfType tys
419 return $ mkApps (mkTyApps dfun tys) dicts
421 paMethod :: (Builtins -> Var) -> Type -> VM CoreExpr
425 dict <- paDictOfType ty
426 return $ mkApps (Var fn) [Type ty, dict]
428 mkPR :: Type -> VM CoreExpr
429 mkPR = paMethod mkPRVar
431 lengthPA :: CoreExpr -> VM CoreExpr
432 lengthPA x = liftM (`App` x) (paMethod lengthPAVar ty)
434 ty = splitPArrayTy (exprType x)
436 replicatePA :: CoreExpr -> CoreExpr -> VM CoreExpr
437 replicatePA len x = liftM (`mkApps` [len,x])
438 (paMethod replicatePAVar (exprType x))
440 emptyPA :: Type -> VM CoreExpr
441 emptyPA = paMethod emptyPAVar
443 liftPA :: CoreExpr -> VM CoreExpr
446 lc <- builtin liftingContext
447 replicatePA (Var lc) x
449 newLocalVVar :: FastString -> Type -> VM VVar
452 lty <- mkPArrayType vty
453 vv <- newLocalVar fs vty
454 lv <- newLocalVar fs lty
457 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
461 mdicts <- mapM mk_dict_var tvs
462 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
466 r <- paDictArgType tv
468 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
469 Nothing -> return Nothing
471 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
473 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
476 dicts <- mapM paDictOfType tys
477 return $ expr `mkTyApps` tys `mkApps` dicts
479 polyVApply :: VExpr -> [Type] -> VM VExpr
482 dicts <- mapM paDictOfType tys
483 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
485 hoistBinding :: Var -> CoreExpr -> VM ()
486 hoistBinding v e = updGEnv $ \env ->
487 env { global_bindings = (v,e) : global_bindings env }
489 hoistExpr :: FastString -> CoreExpr -> VM Var
492 var <- newLocalVar fs (exprType expr)
493 hoistBinding var expr
496 hoistVExpr :: VExpr -> VM VVar
500 vv <- hoistExpr ('v' `consFS` fs) ve
501 lv <- hoistExpr ('l' `consFS` fs) le
504 hoistPolyVExpr :: [TyVar] -> VM VExpr -> VM VExpr
507 expr <- closedV . polyAbstract tvs $ \abstract ->
508 liftM (mapVect abstract) p
509 fn <- hoistVExpr expr
510 polyVApply (vVar fn) (mkTyVarTys tvs)
512 takeHoisted :: VM [(Var, CoreExpr)]
516 setGEnv $ env { global_bindings = [] }
517 return $ global_bindings env
519 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
520 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
522 dict <- paDictOfType env_ty
523 mkv <- builtin mkClosureVar
524 mkl <- builtin mkClosurePVar
525 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
526 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
528 mkClosureApp :: VExpr -> VExpr -> VM VExpr
529 mkClosureApp (vclo, lclo) (varg, larg)
531 vapply <- builtin applyClosureVar
532 lapply <- builtin applyClosurePVar
533 return (Var vapply `mkTyApps` [arg_ty, res_ty] `mkApps` [vclo, varg],
534 Var lapply `mkTyApps` [arg_ty, res_ty] `mkApps` [lclo, larg])
536 (arg_ty, res_ty) = splitClosureTy (exprType vclo)
538 buildClosures :: [TyVar] -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
539 buildClosures tvs vars [] res_ty mk_body
541 buildClosures tvs vars [arg_ty] res_ty mk_body
542 = buildClosure tvs vars arg_ty res_ty mk_body
543 buildClosures tvs vars (arg_ty : arg_tys) res_ty mk_body
545 res_ty' <- mkClosureTypes arg_tys res_ty
546 arg <- newLocalVVar FSLIT("x") arg_ty
547 buildClosure tvs vars arg_ty res_ty'
550 lc <- builtin liftingContext
551 clo <- buildClosures tvs (vars ++ [arg]) arg_tys res_ty mk_body
552 return $ vLams lc (vars ++ [arg]) clo
554 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
556 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
557 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
559 buildClosure :: [TyVar] -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
560 buildClosure tvs vars arg_ty res_ty mk_body
562 (env_ty, env, bind) <- buildEnv vars
563 env_bndr <- newLocalVVar FSLIT("env") env_ty
564 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
566 fn <- hoistPolyVExpr tvs
568 lc <- builtin liftingContext
570 body' <- bind (vVar env_bndr)
571 (vVarApps lc body (vars ++ [arg_bndr]))
572 return (vLamsWithoutLC [env_bndr, arg_bndr] body')
574 mkClosure arg_ty res_ty env_ty fn env
576 buildEnv :: [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
579 lc <- builtin liftingContext
580 let (ty, venv, vbind) = mkVectEnv tys vs
581 (lenv, lbind) <- mkLiftEnv lc tys ls
582 return (ty, (venv, lenv),
583 \(venv,lenv) (vbody,lbody) ->
585 let vbody' = vbind venv vbody
586 lbody' <- lbind lenv lbody
587 return (vbody', lbody'))
592 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
593 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
594 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
595 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
596 \env body -> Case env (mkWildId ty) (exprType body)
597 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
601 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
602 mkLiftEnv lc [ty] [v]
603 = return (Var v, \env body ->
605 len <- lengthPA (Var v)
606 return . Let (NonRec v env)
607 $ Case len lc (exprType body) [(DEFAULT, [], body)])
609 -- NOTE: this transparently deals with empty environments
612 (env_tc, env_tyargs) <- parrayReprTyCon vty
613 let [env_con] = tyConDataCons env_tc
615 env = Var (dataConWrapId env_con)
616 `mkTyApps` env_tyargs
617 `mkVarApps` (lc : vs)
619 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
621 return $ Case scrut (mkWildId (exprType scrut))
623 [(DataAlt env_con, lc : bndrs, body)]
626 vty = mkCoreTupTy tys
628 bndrs | null vs = [mkWildId unitTy]