2 collectAnnTypeBinders, collectAnnTypeArgs, isAnnTypeArg,
6 mkPADictType, mkPArrayType,
7 parrayReprTyCon, parrayReprDataCon, mkVScrut,
8 paDictArgType, paDictOfType, paDFunType,
9 paMethod, lengthPA, replicatePA, emptyPA, liftPA,
10 polyAbstract, polyApply, polyVApply,
11 hoistBinding, hoistExpr, hoistPolyVExpr, takeHoisted,
12 buildClosure, buildClosures,
16 #include "HsVersions.h"
27 import DataCon ( DataCon, dataConWrapId, dataConTag )
29 import Id ( mkWildId )
30 import MkId ( unwrapFamInstScrut )
33 import BasicTypes ( Boxity(..) )
38 import Control.Monad ( liftM, zipWithM_ )
40 collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
41 collectAnnTypeArgs expr = go expr []
43 go (_, AnnApp f (_, AnnType ty)) tys = go f (ty : tys)
46 collectAnnTypeBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
47 collectAnnTypeBinders expr = go [] expr
49 go bs (_, AnnLam b e) | isTyVar b = go (b:bs) e
50 go bs e = (reverse bs, e)
52 collectAnnValBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
53 collectAnnValBinders expr = go [] expr
55 go bs (_, AnnLam b e) | isId b = go (b:bs) e
56 go bs e = (reverse bs, e)
58 isAnnTypeArg :: AnnExpr b ann -> Bool
59 isAnnTypeArg (_, AnnType t) = True
60 isAnnTypeArg _ = False
62 mkDataConTag :: DataCon -> CoreExpr
63 mkDataConTag dc = mkConApp intDataCon [mkIntLitInt $ dataConTag dc]
65 isClosureTyCon :: TyCon -> Bool
66 isClosureTyCon tc = tyConName tc == closureTyConName
68 splitClosureTy :: Type -> (Type, Type)
70 | Just (tc, [arg_ty, res_ty]) <- splitTyConApp_maybe ty
74 | otherwise = pprPanic "splitClosureTy" (ppr ty)
76 isPArrayTyCon :: TyCon -> Bool
77 isPArrayTyCon tc = tyConName tc == parrayTyConName
79 splitPArrayTy :: Type -> Type
81 | Just (tc, [arg_ty]) <- splitTyConApp_maybe ty
85 | otherwise = pprPanic "splitPArrayTy" (ppr ty)
87 mkClosureType :: Type -> Type -> VM Type
88 mkClosureType arg_ty res_ty
90 tc <- builtin closureTyCon
91 return $ mkTyConApp tc [arg_ty, res_ty]
93 mkClosureTypes :: [Type] -> Type -> VM Type
94 mkClosureTypes arg_tys res_ty
96 tc <- builtin closureTyCon
97 return $ foldr (mk tc) res_ty arg_tys
99 mk tc arg_ty res_ty = mkTyConApp tc [arg_ty, res_ty]
101 mkPADictType :: Type -> VM Type
104 tc <- builtin paTyCon
105 return $ TyConApp tc [ty]
107 mkPArrayType :: Type -> VM Type
110 tc <- builtin parrayTyCon
111 return $ TyConApp tc [ty]
113 parrayReprTyCon :: Type -> VM (TyCon, [Type])
114 parrayReprTyCon ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
116 parrayReprDataCon :: Type -> VM (DataCon, [Type])
119 (tc, arg_tys) <- parrayReprTyCon ty
120 let [dc] = tyConDataCons tc
123 mkVScrut :: VExpr -> VM (VExpr, TyCon, [Type])
126 (tc, arg_tys) <- parrayReprTyCon (exprType ve)
127 return ((ve, unwrapFamInstScrut tc arg_tys le), tc, arg_tys)
129 paDictArgType :: TyVar -> VM (Maybe Type)
130 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
132 go ty k | Just k' <- kindView k = go ty k'
135 tv <- newTyVar FSLIT("a") k1
136 mty1 <- go (TyVarTy tv) k1
139 mty2 <- go (AppTy ty (TyVarTy tv)) k2
140 return $ fmap (ForAllTy tv . FunTy ty1) mty2
145 = liftM Just (mkPADictType ty)
147 go ty k = return Nothing
149 paDictOfType :: Type -> VM CoreExpr
150 paDictOfType ty = paDictOfTyApp ty_fn ty_args
152 (ty_fn, ty_args) = splitAppTys ty
154 paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
155 paDictOfTyApp ty_fn ty_args
156 | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
157 paDictOfTyApp (TyVarTy tv) ty_args
159 dfun <- maybeV (lookupTyVarPA tv)
160 paDFunApply dfun ty_args
161 paDictOfTyApp (TyConApp tc _) ty_args
163 dfun <- traceMaybeV "paDictOfTyApp" (ppr tc) (lookupTyConPA tc)
164 paDFunApply (Var dfun) ty_args
165 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
167 paDFunType :: TyCon -> VM Type
170 margs <- mapM paDictArgType tvs
171 res <- mkPADictType (mkTyConApp tc arg_tys)
172 return . mkForAllTys tvs
173 $ mkFunTys [arg | Just arg <- margs] res
176 arg_tys = mkTyVarTys tvs
178 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
181 dicts <- mapM paDictOfType tys
182 return $ mkApps (mkTyApps dfun tys) dicts
184 paMethod :: (Builtins -> Var) -> Type -> VM CoreExpr
188 dict <- paDictOfType ty
189 return $ mkApps (Var fn) [Type ty, dict]
191 lengthPA :: CoreExpr -> VM CoreExpr
192 lengthPA x = liftM (`App` x) (paMethod lengthPAVar ty)
194 ty = splitPArrayTy (exprType x)
196 replicatePA :: CoreExpr -> CoreExpr -> VM CoreExpr
197 replicatePA len x = liftM (`mkApps` [len,x])
198 (paMethod replicatePAVar (exprType x))
200 emptyPA :: Type -> VM CoreExpr
201 emptyPA = paMethod emptyPAVar
203 liftPA :: CoreExpr -> VM CoreExpr
206 lc <- builtin liftingContext
207 replicatePA (Var lc) x
209 newLocalVVar :: FastString -> Type -> VM VVar
212 lty <- mkPArrayType vty
213 vv <- newLocalVar fs vty
214 lv <- newLocalVar fs lty
217 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
221 mdicts <- mapM mk_dict_var tvs
222 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
226 r <- paDictArgType tv
228 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
229 Nothing -> return Nothing
231 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
233 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
236 dicts <- mapM paDictOfType tys
237 return $ expr `mkTyApps` tys `mkApps` dicts
239 polyVApply :: VExpr -> [Type] -> VM VExpr
242 dicts <- mapM paDictOfType tys
243 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
245 hoistBinding :: Var -> CoreExpr -> VM ()
246 hoistBinding v e = updGEnv $ \env ->
247 env { global_bindings = (v,e) : global_bindings env }
249 hoistExpr :: FastString -> CoreExpr -> VM Var
252 var <- newLocalVar fs (exprType expr)
253 hoistBinding var expr
256 hoistVExpr :: VExpr -> VM VVar
260 vv <- hoistExpr ('v' `consFS` fs) ve
261 lv <- hoistExpr ('l' `consFS` fs) le
264 hoistPolyVExpr :: [TyVar] -> VM VExpr -> VM VExpr
267 expr <- closedV . polyAbstract tvs $ \abstract ->
268 liftM (mapVect abstract) p
269 fn <- hoistVExpr expr
270 polyVApply (vVar fn) (mkTyVarTys tvs)
272 takeHoisted :: VM [(Var, CoreExpr)]
276 setGEnv $ env { global_bindings = [] }
277 return $ global_bindings env
279 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
280 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
282 dict <- paDictOfType env_ty
283 mkv <- builtin mkClosureVar
284 mkl <- builtin mkClosurePVar
285 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
286 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
288 mkClosureApp :: VExpr -> VExpr -> VM VExpr
289 mkClosureApp (vclo, lclo) (varg, larg)
291 vapply <- builtin applyClosureVar
292 lapply <- builtin applyClosurePVar
293 return (Var vapply `mkTyApps` [arg_ty, res_ty] `mkApps` [vclo, varg],
294 Var lapply `mkTyApps` [arg_ty, res_ty] `mkApps` [lclo, larg])
296 (arg_ty, res_ty) = splitClosureTy (exprType vclo)
298 buildClosures :: [TyVar] -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
299 buildClosures tvs vars [arg_ty] res_ty mk_body
300 = buildClosure tvs vars arg_ty res_ty mk_body
301 buildClosures tvs vars (arg_ty : arg_tys) res_ty mk_body
303 res_ty' <- mkClosureTypes arg_tys res_ty
304 arg <- newLocalVVar FSLIT("x") arg_ty
305 buildClosure tvs vars arg_ty res_ty'
308 lc <- builtin liftingContext
309 clo <- buildClosures tvs (vars ++ [arg]) arg_tys res_ty mk_body
310 return $ vLams lc (vars ++ [arg]) clo
312 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
314 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
315 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
317 buildClosure :: [TyVar] -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
318 buildClosure tvs vars arg_ty res_ty mk_body
320 (env_ty, env, bind) <- buildEnv vars
321 env_bndr <- newLocalVVar FSLIT("env") env_ty
322 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
324 fn <- hoistPolyVExpr tvs
326 lc <- builtin liftingContext
328 body' <- bind (vVar env_bndr)
329 (vVarApps lc body (vars ++ [arg_bndr]))
330 return (vLamsWithoutLC [env_bndr, arg_bndr] body')
332 mkClosure arg_ty res_ty env_ty fn env
334 buildEnv :: [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
337 lc <- builtin liftingContext
338 let (ty, venv, vbind) = mkVectEnv tys vs
339 (lenv, lbind) <- mkLiftEnv lc tys ls
340 return (ty, (venv, lenv),
341 \(venv,lenv) (vbody,lbody) ->
343 let vbody' = vbind venv vbody
344 lbody' <- lbind lenv lbody
345 return (vbody', lbody'))
350 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
351 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
352 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
353 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
354 \env body -> Case env (mkWildId ty) (exprType body)
355 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
359 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
360 mkLiftEnv lc [ty] [v]
361 = return (Var v, \env body ->
363 len <- lengthPA (Var v)
364 return . Let (NonRec v env)
365 $ Case len lc (exprType body) [(DEFAULT, [], body)])
367 -- NOTE: this transparently deals with empty environments
370 (env_tc, env_tyargs) <- parrayReprTyCon vty
371 let [env_con] = tyConDataCons env_tc
373 env = Var (dataConWrapId env_con)
374 `mkTyApps` env_tyargs
375 `mkVarApps` (lc : vs)
377 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
379 return $ Case scrut (mkWildId (exprType scrut))
381 [(DataAlt env_con, lc : bndrs, body)]
384 vty = mkCoreTupTy tys
386 bndrs | null vs = [mkWildId unitTy]