2 collectAnnTypeBinders, collectAnnTypeArgs, isAnnTypeArg,
4 mkPADictType, mkPArrayType,
5 paDictArgType, paDictOfType,
6 paMethod, lengthPA, replicatePA, emptyPA,
7 polyAbstract, polyApply, polyVApply,
9 hoistExpr, hoistPolyVExpr, takeHoisted,
13 #include "HsVersions.h"
24 import DataCon ( dataConWrapId )
26 import Id ( mkWildId )
27 import MkId ( unwrapFamInstScrut )
30 import BasicTypes ( Boxity(..) )
35 import Control.Monad ( liftM, zipWithM_ )
37 collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
38 collectAnnTypeArgs expr = go expr []
40 go (_, AnnApp f (_, AnnType ty)) tys = go f (ty : tys)
43 collectAnnTypeBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
44 collectAnnTypeBinders expr = go [] expr
46 go bs (_, AnnLam b e) | isTyVar b = go (b:bs) e
47 go bs e = (reverse bs, e)
49 isAnnTypeArg :: AnnExpr b ann -> Bool
50 isAnnTypeArg (_, AnnType t) = True
51 isAnnTypeArg _ = False
53 isClosureTyCon :: TyCon -> Bool
54 isClosureTyCon tc = tyConName tc == closureTyConName
56 splitClosureTy :: Type -> (Type, Type)
58 | Just (tc, [arg_ty, res_ty]) <- splitTyConApp_maybe ty
62 | otherwise = pprPanic "splitClosureTy" (ppr ty)
64 isPArrayTyCon :: TyCon -> Bool
65 isPArrayTyCon tc = tyConName tc == parrayTyConName
67 splitPArrayTy :: Type -> Type
69 | Just (tc, [arg_ty]) <- splitTyConApp_maybe ty
73 | otherwise = pprPanic "splitPArrayTy" (ppr ty)
75 mkPADictType :: Type -> VM Type
78 tc <- builtin paDictTyCon
79 return $ TyConApp tc [ty]
81 mkPArrayType :: Type -> VM Type
84 tc <- builtin parrayTyCon
85 return $ TyConApp tc [ty]
87 paDictArgType :: TyVar -> VM (Maybe Type)
88 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
90 go ty k | Just k' <- kindView k = go ty k'
93 tv <- newTyVar FSLIT("a") k1
94 mty1 <- go (TyVarTy tv) k1
97 mty2 <- go (AppTy ty (TyVarTy tv)) k2
98 return $ fmap (ForAllTy tv . FunTy ty1) mty2
103 = liftM Just (mkPADictType ty)
105 go ty k = return Nothing
107 paDictOfType :: Type -> VM CoreExpr
108 paDictOfType ty = paDictOfTyApp ty_fn ty_args
110 (ty_fn, ty_args) = splitAppTys ty
112 paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
113 paDictOfTyApp ty_fn ty_args
114 | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
115 paDictOfTyApp (TyVarTy tv) ty_args
117 dfun <- maybeV (lookupTyVarPA tv)
118 paDFunApply dfun ty_args
119 paDictOfTyApp (TyConApp tc _) ty_args
121 pa_class <- builtin paClass
122 (dfun, ty_args') <- lookupInst pa_class [TyConApp tc ty_args]
123 paDFunApply (Var dfun) ty_args'
124 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
126 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
129 dicts <- mapM paDictOfType tys
130 return $ mkApps (mkTyApps dfun tys) dicts
132 paMethod :: (Builtins -> Var) -> Type -> VM CoreExpr
136 dict <- paDictOfType ty
137 return $ mkApps (Var fn) [Type ty, dict]
139 lengthPA :: CoreExpr -> VM CoreExpr
140 lengthPA x = liftM (`App` x) (paMethod lengthPAVar ty)
142 ty = splitPArrayTy (exprType x)
144 replicatePA :: CoreExpr -> CoreExpr -> VM CoreExpr
145 replicatePA len x = liftM (`mkApps` [len,x])
146 (paMethod replicatePAVar (exprType x))
148 emptyPA :: Type -> VM CoreExpr
149 emptyPA = paMethod emptyPAVar
151 newLocalVVar :: FastString -> Type -> VM VVar
154 lty <- mkPArrayType vty
155 vv <- newLocalVar fs vty
156 lv <- newLocalVar fs lty
159 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
163 mdicts <- mapM mk_dict_var tvs
164 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
168 r <- paDictArgType tv
170 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
171 Nothing -> return Nothing
173 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
175 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
178 dicts <- mapM paDictOfType tys
179 return $ expr `mkTyApps` tys `mkApps` dicts
181 polyVApply :: VExpr -> [Type] -> VM VExpr
184 dicts <- mapM paDictOfType tys
185 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
187 lookupPArrayFamInst :: Type -> VM (TyCon, [Type])
188 lookupPArrayFamInst ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
190 hoistExpr :: FastString -> CoreExpr -> VM Var
193 var <- newLocalVar fs (exprType expr)
195 env { global_bindings = (var, expr) : global_bindings env }
198 hoistVExpr :: FastString -> VExpr -> VM VVar
199 hoistVExpr fs (ve, le)
201 vv <- hoistExpr ('v' `consFS` fs) ve
202 lv <- hoistExpr ('l' `consFS` fs) le
205 hoistPolyVExpr :: FastString -> [TyVar] -> VM VExpr -> VM VExpr
206 hoistPolyVExpr fs tvs p
208 expr <- closedV . polyAbstract tvs $ \abstract ->
209 liftM (mapVect abstract) p
210 fn <- hoistVExpr fs expr
211 polyVApply (vVar fn) (mkTyVarTys tvs)
213 takeHoisted :: VM [(Var, CoreExpr)]
217 setGEnv $ env { global_bindings = [] }
218 return $ global_bindings env
221 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
222 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
224 dict <- paDictOfType env_ty
225 mkv <- builtin mkClosureVar
226 mkl <- builtin mkClosurePVar
227 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
228 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
230 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
232 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
233 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
235 buildClosure :: [TyVar] -> Var -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
236 buildClosure tvs lv vars arg_ty res_ty mk_body
238 (env_ty, env, bind) <- buildEnv lv vars
239 env_bndr <- newLocalVVar FSLIT("env") env_ty
240 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
242 fn <- hoistPolyVExpr FSLIT("fn") tvs
245 body' <- bind (vVar env_bndr)
246 (mkVVarApps lv body (vars ++ [arg_bndr]))
247 return (mkVLams [env_bndr, arg_bndr] body')
249 mkClosure arg_ty res_ty env_ty fn env
251 buildEnv :: Var -> [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
254 let (ty, venv, vbind) = mkVectEnv tys vs
255 (lenv, lbind) <- mkLiftEnv lv tys ls
256 return (ty, (venv, lenv),
257 \(venv,lenv) (vbody,lbody) ->
259 let vbody' = vbind venv vbody
260 lbody' <- lbind lenv lbody
261 return (vbody', lbody'))
266 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
267 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
268 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
269 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
270 \env body -> Case env (mkWildId ty) (exprType body)
271 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
275 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
276 mkLiftEnv lv [ty] [v]
277 = return (Var v, \env body ->
279 len <- lengthPA (Var v)
280 return . Let (NonRec v env)
281 $ Case len lv (exprType body) [(DEFAULT, [], body)])
283 -- NOTE: this transparently deals with empty environments
286 (env_tc, env_tyargs) <- lookupPArrayFamInst vty
287 let [env_con] = tyConDataCons env_tc
289 env = Var (dataConWrapId env_con)
290 `mkTyApps` env_tyargs
291 `mkVarApps` (lv : vs)
293 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
295 return $ Case scrut (mkWildId (exprType scrut))
297 [(DataAlt env_con, lv : bndrs, body)]
300 vty = mkCoreTupTy tys
302 bndrs | null vs = [mkWildId unitTy]