2 collectAnnTypeBinders, collectAnnTypeArgs, isAnnTypeArg,
6 mkPRepr, mkToPRepr, mkFromPRepr,
7 mkPADictType, mkPArrayType, mkPReprType,
8 parrayReprTyCon, parrayReprDataCon, mkVScrut,
9 prDictOfType, prCoerce,
10 paDictArgType, paDictOfType, paDFunType,
11 paMethod, lengthPA, replicatePA, emptyPA, liftPA,
12 polyAbstract, polyApply, polyVApply,
13 hoistBinding, hoistExpr, hoistPolyVExpr, takeHoisted,
14 buildClosure, buildClosures,
18 #include "HsVersions.h"
30 import DataCon ( DataCon, dataConWrapId, dataConTag )
32 import Id ( mkWildId )
33 import MkId ( unwrapFamInstScrut )
37 import BasicTypes ( Boxity(..) )
42 import Control.Monad ( liftM, liftM2, zipWithM_ )
44 collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
45 collectAnnTypeArgs expr = go expr []
47 go (_, AnnApp f (_, AnnType ty)) tys = go f (ty : tys)
50 collectAnnTypeBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
51 collectAnnTypeBinders expr = go [] expr
53 go bs (_, AnnLam b e) | isTyVar b = go (b:bs) e
54 go bs e = (reverse bs, e)
56 collectAnnValBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
57 collectAnnValBinders expr = go [] expr
59 go bs (_, AnnLam b e) | isId b = go (b:bs) e
60 go bs e = (reverse bs, e)
62 isAnnTypeArg :: AnnExpr b ann -> Bool
63 isAnnTypeArg (_, AnnType t) = True
64 isAnnTypeArg _ = False
66 mkDataConTag :: DataCon -> CoreExpr
67 mkDataConTag dc = mkConApp intDataCon [mkIntLitInt $ dataConTag dc]
69 splitUnTy :: String -> Name -> Type -> Type
71 | Just (tc, [ty']) <- splitTyConApp_maybe ty
72 , tyConName tc == name
75 | otherwise = pprPanic s (ppr ty)
77 splitBinTy :: String -> Name -> Type -> (Type, Type)
79 | Just (tc, [ty1, ty2]) <- splitTyConApp_maybe ty
80 , tyConName tc == name
83 | otherwise = pprPanic s (ppr ty)
85 splitCrossTy :: Type -> (Type, Type)
86 splitCrossTy = splitBinTy "splitCrossTy" ndpCrossTyConName
88 splitPlusTy :: Type -> (Type, Type)
89 splitPlusTy = splitBinTy "splitSumTy" ndpPlusTyConName
91 splitEmbedTy :: Type -> Type
92 splitEmbedTy = splitUnTy "splitEmbedTy" embedTyConName
94 splitClosureTy :: Type -> (Type, Type)
95 splitClosureTy = splitBinTy "splitClosureTy" closureTyConName
97 splitPArrayTy :: Type -> Type
98 splitPArrayTy = splitUnTy "splitPArrayTy" parrayTyConName
100 mkBuiltinTyConApp :: (Builtins -> TyCon) -> [Type] -> VM Type
101 mkBuiltinTyConApp get_tc tys
104 return $ mkTyConApp tc tys
106 mkBuiltinTyConApps :: (Builtins -> TyCon) -> [Type] -> Type -> VM Type
107 mkBuiltinTyConApps get_tc tys ty
110 return $ foldr (mk tc) ty tys
112 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
114 mkBuiltinTyConApps1 :: (Builtins -> TyCon) -> Type -> [Type] -> VM Type
115 mkBuiltinTyConApps1 get_tc dft [] = return dft
116 mkBuiltinTyConApps1 get_tc dft tys
120 [] -> pprPanic "mkBuiltinTyConApps1" (ppr tc)
121 _ -> return $ foldr1 (mk tc) tys
123 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
125 mkPRepr :: [[Type]] -> VM Type
126 mkPRepr [] = return unitTy
129 embed <- builtin embedTyCon
130 cross <- builtin crossTyCon
131 plus <- builtin plusTyCon
133 let mk_embed ty = mkTyConApp embed [ty]
134 mk_cross ty1 ty2 = mkTyConApp cross [ty1, ty2]
135 mk_plus ty1 ty2 = mkTyConApp plus [ty1, ty2]
138 mk_tup tys = foldr1 mk_cross tys
141 mk_sum tys = foldr1 mk_plus tys
144 . map (mk_tup . map mk_embed)
147 mkToPRepr :: [[CoreExpr]] -> VM ([CoreExpr], Type)
150 embed_tc <- builtin embedTyCon
151 embed_dc <- builtin embedDataCon
152 cross_tc <- builtin crossTyCon
153 cross_dc <- builtin crossDataCon
154 plus_tc <- builtin plusTyCon
155 left_dc <- builtin leftDataCon
156 right_dc <- builtin rightDataCon
159 = (mkConApp embed_dc [Type ty, expr],
160 mkTyConApp embed_tc [ty])
161 where ty = exprType expr
163 mk_cross (expr1, ty1) (expr2, ty2)
164 = (mkConApp cross_dc [Type ty1, Type ty2, expr1, expr2],
165 mkTyConApp cross_tc [ty1, ty2])
167 mk_tup [] = (Var unitDataConId, unitTy)
168 mk_tup es = foldr1 mk_cross es
170 mk_sum [] = ([Var unitDataConId], unitTy)
171 mk_sum [(expr, ty)] = ([expr], ty)
172 mk_sum ((expr, lty) : es)
173 = let (alts, rty) = mk_sum es
175 (mkConApp left_dc [Type lty, Type rty, expr]
176 : [mkConApp right_dc [Type lty, Type rty, alt] | alt <- alts],
177 mkTyConApp plus_tc [lty, rty])
179 return . mk_sum $ map (mk_tup . map mk_embed) ess
181 mkFromPRepr :: CoreExpr -> Type -> [([Var], CoreExpr)] -> VM CoreExpr
182 mkFromPRepr scrut res_ty alts
184 embed_dc <- builtin embedDataCon
185 cross_dc <- builtin crossDataCon
186 left_dc <- builtin leftDataCon
187 right_dc <- builtin rightDataCon
188 pa_tc <- builtin paTyCon
190 let un_embed expr ty var res
191 = Case expr (mkWildId ty) res_ty
192 [(DataAlt embed_dc, [var], res)]
194 un_cross expr ty var1 var2 res
195 = Case expr (mkWildId ty) res_ty
196 [(DataAlt cross_dc, [var1, var2], res)]
198 un_tup expr ty [] res = return res
199 un_tup expr ty [var] res = return $ un_embed expr ty var res
200 un_tup expr ty (var : vars) res
202 lv <- newLocalVar FSLIT("x") lty
203 rv <- newLocalVar FSLIT("y") rty
204 liftM (un_cross expr ty lv rv
205 . un_embed (Var lv) lty var)
206 (un_tup (Var rv) rty vars res)
208 (lty, rty) = splitCrossTy ty
210 un_plus expr ty var1 var2 res1 res2
211 = Case expr (mkWildId ty) res_ty
212 [(DataAlt left_dc, [var1], res1),
213 (DataAlt right_dc, [var2], res2)]
215 un_sum expr ty [(vars, res)] = un_tup expr ty vars res
216 un_sum expr ty ((vars, res) : alts)
218 lv <- newLocalVar FSLIT("l") lty
219 rv <- newLocalVar FSLIT("r") rty
220 liftM2 (un_plus expr ty lv rv)
221 (un_tup (Var lv) lty vars res)
222 (un_sum (Var rv) rty alts)
224 (lty, rty) = splitPlusTy ty
226 un_sum scrut (exprType scrut) alts
228 mkClosureType :: Type -> Type -> VM Type
229 mkClosureType arg_ty res_ty = mkBuiltinTyConApp closureTyCon [arg_ty, res_ty]
231 mkClosureTypes :: [Type] -> Type -> VM Type
232 mkClosureTypes = mkBuiltinTyConApps closureTyCon
234 mkPReprType :: Type -> VM Type
235 mkPReprType ty = mkBuiltinTyConApp preprTyCon [ty]
237 mkPADictType :: Type -> VM Type
238 mkPADictType ty = mkBuiltinTyConApp paTyCon [ty]
240 mkPArrayType :: Type -> VM Type
241 mkPArrayType ty = mkBuiltinTyConApp parrayTyCon [ty]
243 parrayReprTyCon :: Type -> VM (TyCon, [Type])
244 parrayReprTyCon ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
246 parrayReprDataCon :: Type -> VM (DataCon, [Type])
249 (tc, arg_tys) <- parrayReprTyCon ty
250 let [dc] = tyConDataCons tc
253 mkVScrut :: VExpr -> VM (VExpr, TyCon, [Type])
256 (tc, arg_tys) <- parrayReprTyCon (exprType ve)
257 return ((ve, unwrapFamInstScrut tc arg_tys le), tc, arg_tys)
259 prDictOfType :: Type -> VM CoreExpr
261 | Just (tycon, ty_args) <- splitTyConApp_maybe orig_ty
263 dfun <- traceMaybeV "prDictOfType" (ppr tycon) (lookupTyConPR tycon)
264 prDFunApply (Var dfun) ty_args
266 prDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
269 args <- mapM mkDFunArg arg_tys
270 return $ mkApps mono_dfun args
272 mono_dfun = mkTyApps dfun tys
273 (arg_tys, _) = splitFunTys (exprType mono_dfun)
275 mkDFunArg :: Type -> VM CoreExpr
277 | Just (tycon, [arg]) <- splitTyConApp_maybe ty
279 = let name = tyConName tycon
281 get_dict | name == paTyConName = paDictOfType
282 | name == prTyConName = prDictOfType
283 | otherwise = pprPanic "mkDFunArg" (ppr ty)
287 mkDFunArg ty = pprPanic "mkDFunArg" (ppr ty)
289 prCoerce :: TyCon -> [Type] -> CoreExpr -> VM CoreExpr
290 prCoerce repr_tc args expr
291 | Just arg_co <- tyConFamilyCoercion_maybe repr_tc
293 pr_tc <- builtin prTyCon
295 let co = mkAppCoercion (mkTyConApp pr_tc [])
296 (mkSymCoercion (mkTyConApp arg_co args))
298 return $ mkCoerce co expr
300 paDictArgType :: TyVar -> VM (Maybe Type)
301 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
303 go ty k | Just k' <- kindView k = go ty k'
306 tv <- newTyVar FSLIT("a") k1
307 mty1 <- go (TyVarTy tv) k1
310 mty2 <- go (AppTy ty (TyVarTy tv)) k2
311 return $ fmap (ForAllTy tv . FunTy ty1) mty2
316 = liftM Just (mkPADictType ty)
318 go ty k = return Nothing
320 paDictOfType :: Type -> VM CoreExpr
321 paDictOfType ty = paDictOfTyApp ty_fn ty_args
323 (ty_fn, ty_args) = splitAppTys ty
325 paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
326 paDictOfTyApp ty_fn ty_args
327 | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
328 paDictOfTyApp (TyVarTy tv) ty_args
330 dfun <- maybeV (lookupTyVarPA tv)
331 paDFunApply dfun ty_args
332 paDictOfTyApp (TyConApp tc _) ty_args
334 dfun <- traceMaybeV "paDictOfTyApp" (ppr tc) (lookupTyConPA tc)
335 paDFunApply (Var dfun) ty_args
336 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
338 paDFunType :: TyCon -> VM Type
341 margs <- mapM paDictArgType tvs
342 res <- mkPADictType (mkTyConApp tc arg_tys)
343 return . mkForAllTys tvs
344 $ mkFunTys [arg | Just arg <- margs] res
347 arg_tys = mkTyVarTys tvs
349 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
352 dicts <- mapM paDictOfType tys
353 return $ mkApps (mkTyApps dfun tys) dicts
355 paMethod :: (Builtins -> Var) -> Type -> VM CoreExpr
359 dict <- paDictOfType ty
360 return $ mkApps (Var fn) [Type ty, dict]
362 lengthPA :: CoreExpr -> VM CoreExpr
363 lengthPA x = liftM (`App` x) (paMethod lengthPAVar ty)
365 ty = splitPArrayTy (exprType x)
367 replicatePA :: CoreExpr -> CoreExpr -> VM CoreExpr
368 replicatePA len x = liftM (`mkApps` [len,x])
369 (paMethod replicatePAVar (exprType x))
371 emptyPA :: Type -> VM CoreExpr
372 emptyPA = paMethod emptyPAVar
374 liftPA :: CoreExpr -> VM CoreExpr
377 lc <- builtin liftingContext
378 replicatePA (Var lc) x
380 newLocalVVar :: FastString -> Type -> VM VVar
383 lty <- mkPArrayType vty
384 vv <- newLocalVar fs vty
385 lv <- newLocalVar fs lty
388 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
392 mdicts <- mapM mk_dict_var tvs
393 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
397 r <- paDictArgType tv
399 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
400 Nothing -> return Nothing
402 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
404 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
407 dicts <- mapM paDictOfType tys
408 return $ expr `mkTyApps` tys `mkApps` dicts
410 polyVApply :: VExpr -> [Type] -> VM VExpr
413 dicts <- mapM paDictOfType tys
414 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
416 hoistBinding :: Var -> CoreExpr -> VM ()
417 hoistBinding v e = updGEnv $ \env ->
418 env { global_bindings = (v,e) : global_bindings env }
420 hoistExpr :: FastString -> CoreExpr -> VM Var
423 var <- newLocalVar fs (exprType expr)
424 hoistBinding var expr
427 hoistVExpr :: VExpr -> VM VVar
431 vv <- hoistExpr ('v' `consFS` fs) ve
432 lv <- hoistExpr ('l' `consFS` fs) le
435 hoistPolyVExpr :: [TyVar] -> VM VExpr -> VM VExpr
438 expr <- closedV . polyAbstract tvs $ \abstract ->
439 liftM (mapVect abstract) p
440 fn <- hoistVExpr expr
441 polyVApply (vVar fn) (mkTyVarTys tvs)
443 takeHoisted :: VM [(Var, CoreExpr)]
447 setGEnv $ env { global_bindings = [] }
448 return $ global_bindings env
450 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
451 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
453 dict <- paDictOfType env_ty
454 mkv <- builtin mkClosureVar
455 mkl <- builtin mkClosurePVar
456 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
457 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
459 mkClosureApp :: VExpr -> VExpr -> VM VExpr
460 mkClosureApp (vclo, lclo) (varg, larg)
462 vapply <- builtin applyClosureVar
463 lapply <- builtin applyClosurePVar
464 return (Var vapply `mkTyApps` [arg_ty, res_ty] `mkApps` [vclo, varg],
465 Var lapply `mkTyApps` [arg_ty, res_ty] `mkApps` [lclo, larg])
467 (arg_ty, res_ty) = splitClosureTy (exprType vclo)
469 buildClosures :: [TyVar] -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
470 buildClosures tvs vars [] res_ty mk_body
472 buildClosures tvs vars [arg_ty] res_ty mk_body
473 = buildClosure tvs vars arg_ty res_ty mk_body
474 buildClosures tvs vars (arg_ty : arg_tys) res_ty mk_body
476 res_ty' <- mkClosureTypes arg_tys res_ty
477 arg <- newLocalVVar FSLIT("x") arg_ty
478 buildClosure tvs vars arg_ty res_ty'
481 lc <- builtin liftingContext
482 clo <- buildClosures tvs (vars ++ [arg]) arg_tys res_ty mk_body
483 return $ vLams lc (vars ++ [arg]) clo
485 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
487 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
488 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
490 buildClosure :: [TyVar] -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
491 buildClosure tvs vars arg_ty res_ty mk_body
493 (env_ty, env, bind) <- buildEnv vars
494 env_bndr <- newLocalVVar FSLIT("env") env_ty
495 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
497 fn <- hoistPolyVExpr tvs
499 lc <- builtin liftingContext
501 body' <- bind (vVar env_bndr)
502 (vVarApps lc body (vars ++ [arg_bndr]))
503 return (vLamsWithoutLC [env_bndr, arg_bndr] body')
505 mkClosure arg_ty res_ty env_ty fn env
507 buildEnv :: [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
510 lc <- builtin liftingContext
511 let (ty, venv, vbind) = mkVectEnv tys vs
512 (lenv, lbind) <- mkLiftEnv lc tys ls
513 return (ty, (venv, lenv),
514 \(venv,lenv) (vbody,lbody) ->
516 let vbody' = vbind venv vbody
517 lbody' <- lbind lenv lbody
518 return (vbody', lbody'))
523 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
524 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
525 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
526 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
527 \env body -> Case env (mkWildId ty) (exprType body)
528 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
532 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
533 mkLiftEnv lc [ty] [v]
534 = return (Var v, \env body ->
536 len <- lengthPA (Var v)
537 return . Let (NonRec v env)
538 $ Case len lc (exprType body) [(DEFAULT, [], body)])
540 -- NOTE: this transparently deals with empty environments
543 (env_tc, env_tyargs) <- parrayReprTyCon vty
544 let [env_con] = tyConDataCons env_tc
546 env = Var (dataConWrapId env_con)
547 `mkTyApps` env_tyargs
548 `mkVarApps` (lc : vs)
550 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
552 return $ Case scrut (mkWildId (exprType scrut))
554 [(DataAlt env_con, lc : bndrs, body)]
557 vty = mkCoreTupTy tys
559 bndrs | null vs = [mkWildId unitTy]