2 collectAnnTypeBinders, collectAnnTypeArgs, isAnnTypeArg,
5 mkPADictType, mkPArrayType,
6 paDictArgType, paDictOfType,
7 paMethod, lengthPA, replicatePA, emptyPA,
8 polyAbstract, polyApply, polyVApply,
10 hoistExpr, hoistPolyVExpr, takeHoisted,
11 buildClosure, buildClosures,
15 #include "HsVersions.h"
26 import DataCon ( dataConWrapId )
28 import Id ( mkWildId )
29 import MkId ( unwrapFamInstScrut )
32 import BasicTypes ( Boxity(..) )
37 import Control.Monad ( liftM, zipWithM_ )
39 collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
40 collectAnnTypeArgs expr = go expr []
42 go (_, AnnApp f (_, AnnType ty)) tys = go f (ty : tys)
45 collectAnnTypeBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
46 collectAnnTypeBinders expr = go [] expr
48 go bs (_, AnnLam b e) | isTyVar b = go (b:bs) e
49 go bs e = (reverse bs, e)
51 collectAnnValBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
52 collectAnnValBinders expr = go [] expr
54 go bs (_, AnnLam b e) | isId b = go (b:bs) e
55 go bs e = (reverse bs, e)
57 isAnnTypeArg :: AnnExpr b ann -> Bool
58 isAnnTypeArg (_, AnnType t) = True
59 isAnnTypeArg _ = False
61 isClosureTyCon :: TyCon -> Bool
62 isClosureTyCon tc = tyConName tc == closureTyConName
64 splitClosureTy :: Type -> (Type, Type)
66 | Just (tc, [arg_ty, res_ty]) <- splitTyConApp_maybe ty
70 | otherwise = pprPanic "splitClosureTy" (ppr ty)
72 isPArrayTyCon :: TyCon -> Bool
73 isPArrayTyCon tc = tyConName tc == parrayTyConName
75 splitPArrayTy :: Type -> Type
77 | Just (tc, [arg_ty]) <- splitTyConApp_maybe ty
81 | otherwise = pprPanic "splitPArrayTy" (ppr ty)
83 mkClosureType :: Type -> Type -> VM Type
84 mkClosureType arg_ty res_ty
86 tc <- builtin closureTyCon
87 return $ mkTyConApp tc [arg_ty, res_ty]
89 mkClosureTypes :: [Type] -> Type -> VM Type
90 mkClosureTypes arg_tys res_ty
92 tc <- builtin closureTyCon
93 return $ foldr (mk tc) res_ty arg_tys
95 mk tc arg_ty res_ty = mkTyConApp tc [arg_ty, res_ty]
97 mkPADictType :: Type -> VM Type
100 tc <- builtin paDictTyCon
101 return $ TyConApp tc [ty]
103 mkPArrayType :: Type -> VM Type
106 tc <- builtin parrayTyCon
107 return $ TyConApp tc [ty]
109 paDictArgType :: TyVar -> VM (Maybe Type)
110 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
112 go ty k | Just k' <- kindView k = go ty k'
115 tv <- newTyVar FSLIT("a") k1
116 mty1 <- go (TyVarTy tv) k1
119 mty2 <- go (AppTy ty (TyVarTy tv)) k2
120 return $ fmap (ForAllTy tv . FunTy ty1) mty2
125 = liftM Just (mkPADictType ty)
127 go ty k = return Nothing
129 paDictOfType :: Type -> VM CoreExpr
130 paDictOfType ty = paDictOfTyApp ty_fn ty_args
132 (ty_fn, ty_args) = splitAppTys ty
134 paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
135 paDictOfTyApp ty_fn ty_args
136 | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
137 paDictOfTyApp (TyVarTy tv) ty_args
139 dfun <- maybeV (lookupTyVarPA tv)
140 paDFunApply dfun ty_args
141 paDictOfTyApp (TyConApp tc _) ty_args
143 pa_class <- builtin paClass
144 (dfun, ty_args') <- lookupInst pa_class [TyConApp tc ty_args]
145 paDFunApply (Var dfun) ty_args'
146 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
148 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
151 dicts <- mapM paDictOfType tys
152 return $ mkApps (mkTyApps dfun tys) dicts
154 paMethod :: (Builtins -> Var) -> Type -> VM CoreExpr
158 dict <- paDictOfType ty
159 return $ mkApps (Var fn) [Type ty, dict]
161 lengthPA :: CoreExpr -> VM CoreExpr
162 lengthPA x = liftM (`App` x) (paMethod lengthPAVar ty)
164 ty = splitPArrayTy (exprType x)
166 replicatePA :: CoreExpr -> CoreExpr -> VM CoreExpr
167 replicatePA len x = liftM (`mkApps` [len,x])
168 (paMethod replicatePAVar (exprType x))
170 emptyPA :: Type -> VM CoreExpr
171 emptyPA = paMethod emptyPAVar
173 newLocalVVar :: FastString -> Type -> VM VVar
176 lty <- mkPArrayType vty
177 vv <- newLocalVar fs vty
178 lv <- newLocalVar fs lty
181 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
185 mdicts <- mapM mk_dict_var tvs
186 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
190 r <- paDictArgType tv
192 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
193 Nothing -> return Nothing
195 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
197 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
200 dicts <- mapM paDictOfType tys
201 return $ expr `mkTyApps` tys `mkApps` dicts
203 polyVApply :: VExpr -> [Type] -> VM VExpr
206 dicts <- mapM paDictOfType tys
207 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
209 lookupPArrayFamInst :: Type -> VM (TyCon, [Type])
210 lookupPArrayFamInst ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
212 hoistExpr :: FastString -> CoreExpr -> VM Var
215 var <- newLocalVar fs (exprType expr)
217 env { global_bindings = (var, expr) : global_bindings env }
220 hoistVExpr :: VExpr -> VM VVar
224 vv <- hoistExpr ('v' `consFS` fs) ve
225 lv <- hoistExpr ('l' `consFS` fs) le
228 hoistPolyVExpr :: [TyVar] -> VM VExpr -> VM VExpr
231 expr <- closedV . polyAbstract tvs $ \abstract ->
232 liftM (mapVect abstract) p
233 fn <- hoistVExpr expr
234 polyVApply (vVar fn) (mkTyVarTys tvs)
236 takeHoisted :: VM [(Var, CoreExpr)]
240 setGEnv $ env { global_bindings = [] }
241 return $ global_bindings env
243 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
244 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
246 dict <- paDictOfType env_ty
247 mkv <- builtin mkClosureVar
248 mkl <- builtin mkClosurePVar
249 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
250 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
252 mkClosureApp :: VExpr -> VExpr -> VM VExpr
253 mkClosureApp (vclo, lclo) (varg, larg)
255 vapply <- builtin applyClosureVar
256 lapply <- builtin applyClosurePVar
257 return (Var vapply `mkTyApps` [arg_ty, res_ty] `mkApps` [vclo, varg],
258 Var lapply `mkTyApps` [arg_ty, res_ty] `mkApps` [lclo, larg])
260 (arg_ty, res_ty) = splitClosureTy (exprType vclo)
262 buildClosures :: [TyVar] -> Var -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
263 buildClosures tvs lc vars [arg_ty] res_ty mk_body
264 = buildClosure tvs lc vars arg_ty res_ty mk_body
265 buildClosures tvs lc vars (arg_ty : arg_tys) res_ty mk_body
267 res_ty' <- mkClosureTypes arg_tys res_ty
268 arg <- newLocalVVar FSLIT("x") arg_ty
269 buildClosure tvs lc vars arg_ty res_ty'
272 clo <- buildClosures tvs lc (vars ++ [arg]) arg_tys res_ty mk_body
273 return $ vLams lc (vars ++ [arg]) clo
275 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
277 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
278 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
280 buildClosure :: [TyVar] -> Var -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
281 buildClosure tvs lv vars arg_ty res_ty mk_body
283 (env_ty, env, bind) <- buildEnv lv vars
284 env_bndr <- newLocalVVar FSLIT("env") env_ty
285 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
287 fn <- hoistPolyVExpr tvs
290 body' <- bind (vVar env_bndr)
291 (vVarApps lv body (vars ++ [arg_bndr]))
292 return (vLamsWithoutLC [env_bndr, arg_bndr] body')
294 mkClosure arg_ty res_ty env_ty fn env
296 buildEnv :: Var -> [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
299 let (ty, venv, vbind) = mkVectEnv tys vs
300 (lenv, lbind) <- mkLiftEnv lv tys ls
301 return (ty, (venv, lenv),
302 \(venv,lenv) (vbody,lbody) ->
304 let vbody' = vbind venv vbody
305 lbody' <- lbind lenv lbody
306 return (vbody', lbody'))
311 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
312 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
313 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
314 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
315 \env body -> Case env (mkWildId ty) (exprType body)
316 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
320 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
321 mkLiftEnv lv [ty] [v]
322 = return (Var v, \env body ->
324 len <- lengthPA (Var v)
325 return . Let (NonRec v env)
326 $ Case len lv (exprType body) [(DEFAULT, [], body)])
328 -- NOTE: this transparently deals with empty environments
331 (env_tc, env_tyargs) <- lookupPArrayFamInst vty
332 let [env_con] = tyConDataCons env_tc
334 env = Var (dataConWrapId env_con)
335 `mkTyApps` env_tyargs
336 `mkVarApps` (lv : vs)
338 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
340 return $ Case scrut (mkWildId (exprType scrut))
342 [(DataAlt env_con, lv : bndrs, body)]
345 vty = mkCoreTupTy tys
347 bndrs | null vs = [mkWildId unitTy]