2 collectAnnTypeBinders, collectAnnTypeArgs, isAnnTypeArg,
5 mkPADictType, mkPArrayType,
6 paDictArgType, paDictOfType,
7 paMethod, lengthPA, replicatePA, emptyPA, liftPA,
8 polyAbstract, polyApply, polyVApply,
10 hoistBinding, 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 liftPA :: CoreExpr -> VM CoreExpr
176 lc <- builtin liftingContext
177 replicatePA (Var lc) x
179 newLocalVVar :: FastString -> Type -> VM VVar
182 lty <- mkPArrayType vty
183 vv <- newLocalVar fs vty
184 lv <- newLocalVar fs lty
187 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
191 mdicts <- mapM mk_dict_var tvs
192 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
196 r <- paDictArgType tv
198 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
199 Nothing -> return Nothing
201 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
203 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
206 dicts <- mapM paDictOfType tys
207 return $ expr `mkTyApps` tys `mkApps` dicts
209 polyVApply :: VExpr -> [Type] -> VM VExpr
212 dicts <- mapM paDictOfType tys
213 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
215 lookupPArrayFamInst :: Type -> VM (TyCon, [Type])
216 lookupPArrayFamInst ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
218 hoistBinding :: Var -> CoreExpr -> VM ()
219 hoistBinding v e = updGEnv $ \env ->
220 env { global_bindings = (v,e) : global_bindings env }
222 hoistExpr :: FastString -> CoreExpr -> VM Var
225 var <- newLocalVar fs (exprType expr)
226 hoistBinding var expr
229 hoistVExpr :: VExpr -> VM VVar
233 vv <- hoistExpr ('v' `consFS` fs) ve
234 lv <- hoistExpr ('l' `consFS` fs) le
237 hoistPolyVExpr :: [TyVar] -> VM VExpr -> VM VExpr
240 expr <- closedV . polyAbstract tvs $ \abstract ->
241 liftM (mapVect abstract) p
242 fn <- hoistVExpr expr
243 polyVApply (vVar fn) (mkTyVarTys tvs)
245 takeHoisted :: VM [(Var, CoreExpr)]
249 setGEnv $ env { global_bindings = [] }
250 return $ global_bindings env
252 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
253 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
255 dict <- paDictOfType env_ty
256 mkv <- builtin mkClosureVar
257 mkl <- builtin mkClosurePVar
258 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
259 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
261 mkClosureApp :: VExpr -> VExpr -> VM VExpr
262 mkClosureApp (vclo, lclo) (varg, larg)
264 vapply <- builtin applyClosureVar
265 lapply <- builtin applyClosurePVar
266 return (Var vapply `mkTyApps` [arg_ty, res_ty] `mkApps` [vclo, varg],
267 Var lapply `mkTyApps` [arg_ty, res_ty] `mkApps` [lclo, larg])
269 (arg_ty, res_ty) = splitClosureTy (exprType vclo)
271 buildClosures :: [TyVar] -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
272 buildClosures tvs vars [arg_ty] res_ty mk_body
273 = buildClosure tvs vars arg_ty res_ty mk_body
274 buildClosures tvs vars (arg_ty : arg_tys) res_ty mk_body
276 res_ty' <- mkClosureTypes arg_tys res_ty
277 arg <- newLocalVVar FSLIT("x") arg_ty
278 buildClosure tvs vars arg_ty res_ty'
281 lc <- builtin liftingContext
282 clo <- buildClosures tvs (vars ++ [arg]) arg_tys res_ty mk_body
283 return $ vLams lc (vars ++ [arg]) clo
285 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
287 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
288 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
290 buildClosure :: [TyVar] -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
291 buildClosure tvs vars arg_ty res_ty mk_body
293 (env_ty, env, bind) <- buildEnv vars
294 env_bndr <- newLocalVVar FSLIT("env") env_ty
295 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
297 fn <- hoistPolyVExpr tvs
299 lc <- builtin liftingContext
301 body' <- bind (vVar env_bndr)
302 (vVarApps lc body (vars ++ [arg_bndr]))
303 return (vLamsWithoutLC [env_bndr, arg_bndr] body')
305 mkClosure arg_ty res_ty env_ty fn env
307 buildEnv :: [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
310 lc <- builtin liftingContext
311 let (ty, venv, vbind) = mkVectEnv tys vs
312 (lenv, lbind) <- mkLiftEnv lc tys ls
313 return (ty, (venv, lenv),
314 \(venv,lenv) (vbody,lbody) ->
316 let vbody' = vbind venv vbody
317 lbody' <- lbind lenv lbody
318 return (vbody', lbody'))
323 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
324 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
325 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
326 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
327 \env body -> Case env (mkWildId ty) (exprType body)
328 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
332 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
333 mkLiftEnv lc [ty] [v]
334 = return (Var v, \env body ->
336 len <- lengthPA (Var v)
337 return . Let (NonRec v env)
338 $ Case len lc (exprType body) [(DEFAULT, [], body)])
340 -- NOTE: this transparently deals with empty environments
343 (env_tc, env_tyargs) <- lookupPArrayFamInst vty
344 let [env_con] = tyConDataCons env_tc
346 env = Var (dataConWrapId env_con)
347 `mkTyApps` env_tyargs
348 `mkVarApps` (lc : vs)
350 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
352 return $ Case scrut (mkWildId (exprType scrut))
354 [(DataAlt env_con, lc : bndrs, body)]
357 vty = mkCoreTupTy tys
359 bndrs | null vs = [mkWildId unitTy]