2 collectAnnTypeBinders, collectAnnTypeArgs, isAnnTypeArg,
6 mkPRepr, mkToPRepr, mkFromPRepr,
7 mkPADictType, mkPArrayType, mkPReprType,
8 parrayReprTyCon, parrayReprDataCon, mkVScrut,
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"
29 import DataCon ( DataCon, dataConWrapId, dataConTag )
31 import Id ( mkWildId )
32 import MkId ( unwrapFamInstScrut )
36 import BasicTypes ( Boxity(..) )
41 import Control.Monad ( liftM, liftM2, zipWithM_ )
43 collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
44 collectAnnTypeArgs expr = go expr []
46 go (_, AnnApp f (_, AnnType ty)) tys = go f (ty : tys)
49 collectAnnTypeBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
50 collectAnnTypeBinders expr = go [] expr
52 go bs (_, AnnLam b e) | isTyVar b = go (b:bs) e
53 go bs e = (reverse bs, e)
55 collectAnnValBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
56 collectAnnValBinders expr = go [] expr
58 go bs (_, AnnLam b e) | isId b = go (b:bs) e
59 go bs e = (reverse bs, e)
61 isAnnTypeArg :: AnnExpr b ann -> Bool
62 isAnnTypeArg (_, AnnType t) = True
63 isAnnTypeArg _ = False
65 mkDataConTag :: DataCon -> CoreExpr
66 mkDataConTag dc = mkConApp intDataCon [mkIntLitInt $ dataConTag dc]
68 splitUnTy :: String -> Name -> Type -> Type
70 | Just (tc, [ty']) <- splitTyConApp_maybe ty
71 , tyConName tc == name
74 | otherwise = pprPanic s (ppr ty)
76 splitBinTy :: String -> Name -> Type -> (Type, Type)
78 | Just (tc, [ty1, ty2]) <- splitTyConApp_maybe ty
79 , tyConName tc == name
82 | otherwise = pprPanic s (ppr ty)
84 splitCrossTy :: Type -> (Type, Type)
85 splitCrossTy = splitBinTy "splitCrossTy" ndpCrossTyConName
87 splitPlusTy :: Type -> (Type, Type)
88 splitPlusTy = splitBinTy "splitSumTy" ndpPlusTyConName
90 splitEmbedTy :: Type -> Type
91 splitEmbedTy = splitUnTy "splitEmbedTy" embedTyConName
93 splitClosureTy :: Type -> (Type, Type)
94 splitClosureTy = splitBinTy "splitClosureTy" closureTyConName
96 splitPArrayTy :: Type -> Type
97 splitPArrayTy = splitUnTy "splitPArrayTy" parrayTyConName
99 mkBuiltinTyConApp :: (Builtins -> TyCon) -> [Type] -> VM Type
100 mkBuiltinTyConApp get_tc tys
103 return $ mkTyConApp tc tys
105 mkBuiltinTyConApps :: (Builtins -> TyCon) -> [Type] -> Type -> VM Type
106 mkBuiltinTyConApps get_tc tys ty
109 return $ foldr (mk tc) ty tys
111 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
113 mkBuiltinTyConApps1 :: (Builtins -> TyCon) -> Type -> [Type] -> VM Type
114 mkBuiltinTyConApps1 get_tc dft [] = return dft
115 mkBuiltinTyConApps1 get_tc dft tys
119 [] -> pprPanic "mkBuiltinTyConApps1" (ppr tc)
120 _ -> return $ foldr1 (mk tc) tys
122 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
124 mkPRepr :: [[Type]] -> VM Type
125 mkPRepr [] = return unitTy
128 embed <- builtin embedTyCon
129 cross <- builtin crossTyCon
130 plus <- builtin plusTyCon
132 let mk_embed ty = mkTyConApp embed [ty]
133 mk_cross ty1 ty2 = mkTyConApp cross [ty1, ty2]
134 mk_plus ty1 ty2 = mkTyConApp plus [ty1, ty2]
137 mk_tup tys = foldr1 mk_cross tys
140 mk_sum tys = foldr1 mk_plus tys
143 . map (mk_tup . map mk_embed)
146 mkToPRepr :: [[CoreExpr]] -> VM ([CoreExpr], Type)
149 embed_tc <- builtin embedTyCon
150 embed_dc <- builtin embedDataCon
151 cross_tc <- builtin crossTyCon
152 cross_dc <- builtin crossDataCon
153 plus_tc <- builtin plusTyCon
154 left_dc <- builtin leftDataCon
155 right_dc <- builtin rightDataCon
158 = (mkConApp embed_dc [Type ty, expr],
159 mkTyConApp embed_tc [ty])
160 where ty = exprType expr
162 mk_cross (expr1, ty1) (expr2, ty2)
163 = (mkConApp cross_dc [Type ty1, Type ty2, expr1, expr2],
164 mkTyConApp cross_tc [ty1, ty2])
166 mk_tup [] = (Var unitDataConId, unitTy)
167 mk_tup es = foldr1 mk_cross es
169 mk_sum [] = ([Var unitDataConId], unitTy)
170 mk_sum [(expr, ty)] = ([expr], ty)
171 mk_sum ((expr, lty) : es)
172 = let (alts, rty) = mk_sum es
174 (mkConApp left_dc [Type lty, Type rty, expr]
175 : [mkConApp right_dc [Type lty, Type rty, alt] | alt <- alts],
176 mkTyConApp plus_tc [lty, rty])
178 return . mk_sum $ map (mk_tup . map mk_embed) ess
180 mkFromPRepr :: CoreExpr -> Type -> [([Var], CoreExpr)] -> VM CoreExpr
181 mkFromPRepr scrut res_ty alts
183 embed_dc <- builtin embedDataCon
184 cross_dc <- builtin crossDataCon
185 left_dc <- builtin leftDataCon
186 right_dc <- builtin rightDataCon
187 pa_tc <- builtin paTyCon
189 let un_embed expr ty var res
190 = Case expr (mkWildId ty) res_ty
191 [(DataAlt embed_dc, [var], res)]
193 un_cross expr ty var1 var2 res
194 = Case expr (mkWildId ty) res_ty
195 [(DataAlt cross_dc, [var1, var2], res)]
197 un_tup expr ty [] res = return res
198 un_tup expr ty [var] res = return $ un_embed expr ty var res
199 un_tup expr ty (var : vars) res
201 lv <- newLocalVar FSLIT("x") lty
202 rv <- newLocalVar FSLIT("y") rty
203 liftM (un_cross expr ty lv rv
204 . un_embed (Var lv) lty var)
205 (un_tup (Var rv) rty vars res)
207 (lty, rty) = splitCrossTy ty
209 un_plus expr ty var1 var2 res1 res2
210 = Case expr (mkWildId ty) res_ty
211 [(DataAlt left_dc, [var1], res1),
212 (DataAlt right_dc, [var2], res2)]
214 un_sum expr ty [(vars, res)] = un_tup expr ty vars res
215 un_sum expr ty ((vars, res) : alts)
217 lv <- newLocalVar FSLIT("l") lty
218 rv <- newLocalVar FSLIT("r") rty
219 liftM2 (un_plus expr ty lv rv)
220 (un_tup (Var lv) lty vars res)
221 (un_sum (Var rv) rty alts)
223 (lty, rty) = splitPlusTy ty
225 un_sum scrut (exprType scrut) alts
227 mkClosureType :: Type -> Type -> VM Type
228 mkClosureType arg_ty res_ty = mkBuiltinTyConApp closureTyCon [arg_ty, res_ty]
230 mkClosureTypes :: [Type] -> Type -> VM Type
231 mkClosureTypes = mkBuiltinTyConApps closureTyCon
233 mkPReprType :: Type -> VM Type
234 mkPReprType ty = mkBuiltinTyConApp preprTyCon [ty]
236 mkPADictType :: Type -> VM Type
237 mkPADictType ty = mkBuiltinTyConApp paTyCon [ty]
239 mkPArrayType :: Type -> VM Type
240 mkPArrayType ty = mkBuiltinTyConApp parrayTyCon [ty]
242 parrayReprTyCon :: Type -> VM (TyCon, [Type])
243 parrayReprTyCon ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
245 parrayReprDataCon :: Type -> VM (DataCon, [Type])
248 (tc, arg_tys) <- parrayReprTyCon ty
249 let [dc] = tyConDataCons tc
252 mkVScrut :: VExpr -> VM (VExpr, TyCon, [Type])
255 (tc, arg_tys) <- parrayReprTyCon (exprType ve)
256 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 paDictArgType :: TyVar -> VM (Maybe Type)
290 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
292 go ty k | Just k' <- kindView k = go ty k'
295 tv <- newTyVar FSLIT("a") k1
296 mty1 <- go (TyVarTy tv) k1
299 mty2 <- go (AppTy ty (TyVarTy tv)) k2
300 return $ fmap (ForAllTy tv . FunTy ty1) mty2
305 = liftM Just (mkPADictType ty)
307 go ty k = return Nothing
309 paDictOfType :: Type -> VM CoreExpr
310 paDictOfType ty = paDictOfTyApp ty_fn ty_args
312 (ty_fn, ty_args) = splitAppTys ty
314 paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
315 paDictOfTyApp ty_fn ty_args
316 | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
317 paDictOfTyApp (TyVarTy tv) ty_args
319 dfun <- maybeV (lookupTyVarPA tv)
320 paDFunApply dfun ty_args
321 paDictOfTyApp (TyConApp tc _) ty_args
323 dfun <- traceMaybeV "paDictOfTyApp" (ppr tc) (lookupTyConPA tc)
324 paDFunApply (Var dfun) ty_args
325 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
327 paDFunType :: TyCon -> VM Type
330 margs <- mapM paDictArgType tvs
331 res <- mkPADictType (mkTyConApp tc arg_tys)
332 return . mkForAllTys tvs
333 $ mkFunTys [arg | Just arg <- margs] res
336 arg_tys = mkTyVarTys tvs
338 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
341 dicts <- mapM paDictOfType tys
342 return $ mkApps (mkTyApps dfun tys) dicts
344 paMethod :: (Builtins -> Var) -> Type -> VM CoreExpr
348 dict <- paDictOfType ty
349 return $ mkApps (Var fn) [Type ty, dict]
351 lengthPA :: CoreExpr -> VM CoreExpr
352 lengthPA x = liftM (`App` x) (paMethod lengthPAVar ty)
354 ty = splitPArrayTy (exprType x)
356 replicatePA :: CoreExpr -> CoreExpr -> VM CoreExpr
357 replicatePA len x = liftM (`mkApps` [len,x])
358 (paMethod replicatePAVar (exprType x))
360 emptyPA :: Type -> VM CoreExpr
361 emptyPA = paMethod emptyPAVar
363 liftPA :: CoreExpr -> VM CoreExpr
366 lc <- builtin liftingContext
367 replicatePA (Var lc) x
369 newLocalVVar :: FastString -> Type -> VM VVar
372 lty <- mkPArrayType vty
373 vv <- newLocalVar fs vty
374 lv <- newLocalVar fs lty
377 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
381 mdicts <- mapM mk_dict_var tvs
382 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
386 r <- paDictArgType tv
388 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
389 Nothing -> return Nothing
391 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
393 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
396 dicts <- mapM paDictOfType tys
397 return $ expr `mkTyApps` tys `mkApps` dicts
399 polyVApply :: VExpr -> [Type] -> VM VExpr
402 dicts <- mapM paDictOfType tys
403 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
405 hoistBinding :: Var -> CoreExpr -> VM ()
406 hoistBinding v e = updGEnv $ \env ->
407 env { global_bindings = (v,e) : global_bindings env }
409 hoistExpr :: FastString -> CoreExpr -> VM Var
412 var <- newLocalVar fs (exprType expr)
413 hoistBinding var expr
416 hoistVExpr :: VExpr -> VM VVar
420 vv <- hoistExpr ('v' `consFS` fs) ve
421 lv <- hoistExpr ('l' `consFS` fs) le
424 hoistPolyVExpr :: [TyVar] -> VM VExpr -> VM VExpr
427 expr <- closedV . polyAbstract tvs $ \abstract ->
428 liftM (mapVect abstract) p
429 fn <- hoistVExpr expr
430 polyVApply (vVar fn) (mkTyVarTys tvs)
432 takeHoisted :: VM [(Var, CoreExpr)]
436 setGEnv $ env { global_bindings = [] }
437 return $ global_bindings env
439 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
440 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
442 dict <- paDictOfType env_ty
443 mkv <- builtin mkClosureVar
444 mkl <- builtin mkClosurePVar
445 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
446 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
448 mkClosureApp :: VExpr -> VExpr -> VM VExpr
449 mkClosureApp (vclo, lclo) (varg, larg)
451 vapply <- builtin applyClosureVar
452 lapply <- builtin applyClosurePVar
453 return (Var vapply `mkTyApps` [arg_ty, res_ty] `mkApps` [vclo, varg],
454 Var lapply `mkTyApps` [arg_ty, res_ty] `mkApps` [lclo, larg])
456 (arg_ty, res_ty) = splitClosureTy (exprType vclo)
458 buildClosures :: [TyVar] -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
459 buildClosures tvs vars [] res_ty mk_body
461 buildClosures tvs vars [arg_ty] res_ty mk_body
462 = buildClosure tvs vars arg_ty res_ty mk_body
463 buildClosures tvs vars (arg_ty : arg_tys) res_ty mk_body
465 res_ty' <- mkClosureTypes arg_tys res_ty
466 arg <- newLocalVVar FSLIT("x") arg_ty
467 buildClosure tvs vars arg_ty res_ty'
470 lc <- builtin liftingContext
471 clo <- buildClosures tvs (vars ++ [arg]) arg_tys res_ty mk_body
472 return $ vLams lc (vars ++ [arg]) clo
474 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
476 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
477 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
479 buildClosure :: [TyVar] -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
480 buildClosure tvs vars arg_ty res_ty mk_body
482 (env_ty, env, bind) <- buildEnv vars
483 env_bndr <- newLocalVVar FSLIT("env") env_ty
484 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
486 fn <- hoistPolyVExpr tvs
488 lc <- builtin liftingContext
490 body' <- bind (vVar env_bndr)
491 (vVarApps lc body (vars ++ [arg_bndr]))
492 return (vLamsWithoutLC [env_bndr, arg_bndr] body')
494 mkClosure arg_ty res_ty env_ty fn env
496 buildEnv :: [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
499 lc <- builtin liftingContext
500 let (ty, venv, vbind) = mkVectEnv tys vs
501 (lenv, lbind) <- mkLiftEnv lc tys ls
502 return (ty, (venv, lenv),
503 \(venv,lenv) (vbody,lbody) ->
505 let vbody' = vbind venv vbody
506 lbody' <- lbind lenv lbody
507 return (vbody', lbody'))
512 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
513 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
514 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
515 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
516 \env body -> Case env (mkWildId ty) (exprType body)
517 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
521 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
522 mkLiftEnv lc [ty] [v]
523 = return (Var v, \env body ->
525 len <- lengthPA (Var v)
526 return . Let (NonRec v env)
527 $ Case len lc (exprType body) [(DEFAULT, [], body)])
529 -- NOTE: this transparently deals with empty environments
532 (env_tc, env_tyargs) <- parrayReprTyCon vty
533 let [env_con] = tyConDataCons env_tc
535 env = Var (dataConWrapId env_con)
536 `mkTyApps` env_tyargs
537 `mkVarApps` (lc : vs)
539 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
541 return $ Case scrut (mkWildId (exprType scrut))
543 [(DataAlt env_con, lc : bndrs, body)]
546 vty = mkCoreTupTy tys
548 bndrs | null vs = [mkWildId unitTy]