2 collectAnnTypeBinders, collectAnnTypeArgs, isAnnTypeArg,
6 mkPRepr, mkToPRepr, mkFromPRepr,
7 mkPADictType, mkPArrayType, mkPReprType,
8 parrayReprTyCon, parrayReprDataCon, mkVScrut,
9 paDictArgType, paDictOfType, paDFunType,
10 paMethod, lengthPA, replicatePA, emptyPA, liftPA,
11 polyAbstract, polyApply, polyVApply,
12 hoistBinding, hoistExpr, hoistPolyVExpr, takeHoisted,
13 buildClosure, buildClosures,
17 #include "HsVersions.h"
28 import DataCon ( DataCon, dataConWrapId, dataConTag )
30 import Id ( mkWildId )
31 import MkId ( unwrapFamInstScrut )
35 import BasicTypes ( Boxity(..) )
40 import Control.Monad ( liftM, liftM2, zipWithM_ )
42 collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
43 collectAnnTypeArgs expr = go expr []
45 go (_, AnnApp f (_, AnnType ty)) tys = go f (ty : tys)
48 collectAnnTypeBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
49 collectAnnTypeBinders expr = go [] expr
51 go bs (_, AnnLam b e) | isTyVar b = go (b:bs) e
52 go bs e = (reverse bs, e)
54 collectAnnValBinders :: AnnExpr Var ann -> ([Var], AnnExpr Var ann)
55 collectAnnValBinders expr = go [] expr
57 go bs (_, AnnLam b e) | isId b = go (b:bs) e
58 go bs e = (reverse bs, e)
60 isAnnTypeArg :: AnnExpr b ann -> Bool
61 isAnnTypeArg (_, AnnType t) = True
62 isAnnTypeArg _ = False
64 mkDataConTag :: DataCon -> CoreExpr
65 mkDataConTag dc = mkConApp intDataCon [mkIntLitInt $ dataConTag dc]
67 splitUnTy :: String -> Name -> Type -> Type
69 | Just (tc, [ty']) <- splitTyConApp_maybe ty
70 , tyConName tc == name
73 | otherwise = pprPanic s (ppr ty)
75 splitBinTy :: String -> Name -> Type -> (Type, Type)
77 | Just (tc, [ty1, ty2]) <- splitTyConApp_maybe ty
78 , tyConName tc == name
81 | otherwise = pprPanic s (ppr ty)
83 splitCrossTy :: Type -> (Type, Type)
84 splitCrossTy = splitBinTy "splitCrossTy" ndpCrossTyConName
86 splitPlusTy :: Type -> (Type, Type)
87 splitPlusTy = splitBinTy "splitSumTy" ndpPlusTyConName
89 splitEmbedTy :: Type -> Type
90 splitEmbedTy = splitUnTy "splitEmbedTy" embedTyConName
92 splitClosureTy :: Type -> (Type, Type)
93 splitClosureTy = splitBinTy "splitClosureTy" closureTyConName
95 splitPArrayTy :: Type -> Type
96 splitPArrayTy = splitUnTy "splitPArrayTy" parrayTyConName
98 mkBuiltinTyConApp :: (Builtins -> TyCon) -> [Type] -> VM Type
99 mkBuiltinTyConApp get_tc tys
102 return $ mkTyConApp tc tys
104 mkBuiltinTyConApps :: (Builtins -> TyCon) -> [Type] -> Type -> VM Type
105 mkBuiltinTyConApps get_tc tys ty
108 return $ foldr (mk tc) ty tys
110 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
112 mkBuiltinTyConApps1 :: (Builtins -> TyCon) -> Type -> [Type] -> VM Type
113 mkBuiltinTyConApps1 get_tc dft [] = return dft
114 mkBuiltinTyConApps1 get_tc dft tys
118 [] -> pprPanic "mkBuiltinTyConApps1" (ppr tc)
119 _ -> return $ foldr1 (mk tc) tys
121 mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
123 mkPRepr :: [[Type]] -> VM Type
124 mkPRepr [] = return unitTy
127 embed <- builtin embedTyCon
128 cross <- builtin crossTyCon
129 plus <- builtin plusTyCon
131 let mk_embed ty = mkTyConApp embed [ty]
132 mk_cross ty1 ty2 = mkTyConApp cross [ty1, ty2]
133 mk_plus ty1 ty2 = mkTyConApp plus [ty1, ty2]
136 mk_tup tys = foldr1 mk_cross tys
139 mk_sum tys = foldr1 mk_plus tys
142 . map (mk_tup . map mk_embed)
145 mkToPRepr :: [[CoreExpr]] -> VM ([CoreExpr], Type)
148 embed_tc <- builtin embedTyCon
149 embed_dc <- builtin embedDataCon
150 cross_tc <- builtin crossTyCon
151 cross_dc <- builtin crossDataCon
152 plus_tc <- builtin plusTyCon
153 left_dc <- builtin leftDataCon
154 right_dc <- builtin rightDataCon
157 = (mkConApp embed_dc [Type ty, expr],
158 mkTyConApp embed_tc [ty])
159 where ty = exprType expr
161 mk_cross (expr1, ty1) (expr2, ty2)
162 = (mkConApp cross_dc [Type ty1, Type ty2, expr1, expr2],
163 mkTyConApp cross_tc [ty1, ty2])
165 mk_tup [] = (Var unitDataConId, unitTy)
166 mk_tup es = foldr1 mk_cross es
168 mk_sum [] = ([Var unitDataConId], unitTy)
169 mk_sum [(expr, ty)] = ([expr], ty)
170 mk_sum ((expr, lty) : es)
171 = let (alts, rty) = mk_sum es
173 (mkConApp left_dc [Type lty, Type rty, expr]
174 : [mkConApp right_dc [Type lty, Type rty, alt] | alt <- alts],
175 mkTyConApp plus_tc [lty, rty])
177 return . mk_sum $ map (mk_tup . map mk_embed) ess
179 mkFromPRepr :: CoreExpr -> Type -> [([Var], CoreExpr)] -> VM CoreExpr
180 mkFromPRepr scrut res_ty alts
182 embed_dc <- builtin embedDataCon
183 cross_dc <- builtin crossDataCon
184 left_dc <- builtin leftDataCon
185 right_dc <- builtin rightDataCon
186 pa_tc <- builtin paTyCon
188 let un_embed expr ty var res
189 = Case expr (mkWildId ty) res_ty
190 [(DataAlt embed_dc, [var], res)]
192 un_cross expr ty var1 var2 res
193 = Case expr (mkWildId ty) res_ty
194 [(DataAlt cross_dc, [var1, var2], res)]
196 un_tup expr ty [] res = return res
197 un_tup expr ty [var] res = return $ un_embed expr ty var res
198 un_tup expr ty (var : vars) res
200 lv <- newLocalVar FSLIT("x") lty
201 rv <- newLocalVar FSLIT("y") rty
202 liftM (un_cross expr ty lv rv
203 . un_embed (Var lv) lty var)
204 (un_tup (Var rv) rty vars res)
206 (lty, rty) = splitCrossTy ty
208 un_plus expr ty var1 var2 res1 res2
209 = Case expr (mkWildId ty) res_ty
210 [(DataAlt left_dc, [var1], res1),
211 (DataAlt right_dc, [var2], res2)]
213 un_sum expr ty [(vars, res)] = un_tup expr ty vars res
214 un_sum expr ty ((vars, res) : alts)
216 lv <- newLocalVar FSLIT("l") lty
217 rv <- newLocalVar FSLIT("r") rty
218 liftM2 (un_plus expr ty lv rv)
219 (un_tup (Var lv) lty vars res)
220 (un_sum (Var rv) rty alts)
222 (lty, rty) = splitPlusTy ty
224 un_sum scrut (exprType scrut) alts
226 mkClosureType :: Type -> Type -> VM Type
227 mkClosureType arg_ty res_ty = mkBuiltinTyConApp closureTyCon [arg_ty, res_ty]
229 mkClosureTypes :: [Type] -> Type -> VM Type
230 mkClosureTypes = mkBuiltinTyConApps closureTyCon
232 mkPReprType :: Type -> VM Type
233 mkPReprType ty = mkBuiltinTyConApp preprTyCon [ty]
235 mkPADictType :: Type -> VM Type
236 mkPADictType ty = mkBuiltinTyConApp paTyCon [ty]
238 mkPArrayType :: Type -> VM Type
239 mkPArrayType ty = mkBuiltinTyConApp parrayTyCon [ty]
241 parrayReprTyCon :: Type -> VM (TyCon, [Type])
242 parrayReprTyCon ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
244 parrayReprDataCon :: Type -> VM (DataCon, [Type])
247 (tc, arg_tys) <- parrayReprTyCon ty
248 let [dc] = tyConDataCons tc
251 mkVScrut :: VExpr -> VM (VExpr, TyCon, [Type])
254 (tc, arg_tys) <- parrayReprTyCon (exprType ve)
255 return ((ve, unwrapFamInstScrut tc arg_tys le), tc, arg_tys)
257 paDictArgType :: TyVar -> VM (Maybe Type)
258 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
260 go ty k | Just k' <- kindView k = go ty k'
263 tv <- newTyVar FSLIT("a") k1
264 mty1 <- go (TyVarTy tv) k1
267 mty2 <- go (AppTy ty (TyVarTy tv)) k2
268 return $ fmap (ForAllTy tv . FunTy ty1) mty2
273 = liftM Just (mkPADictType ty)
275 go ty k = return Nothing
277 paDictOfType :: Type -> VM CoreExpr
278 paDictOfType ty = paDictOfTyApp ty_fn ty_args
280 (ty_fn, ty_args) = splitAppTys ty
282 paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
283 paDictOfTyApp ty_fn ty_args
284 | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
285 paDictOfTyApp (TyVarTy tv) ty_args
287 dfun <- maybeV (lookupTyVarPA tv)
288 paDFunApply dfun ty_args
289 paDictOfTyApp (TyConApp tc _) ty_args
291 dfun <- traceMaybeV "paDictOfTyApp" (ppr tc) (lookupTyConPA tc)
292 paDFunApply (Var dfun) ty_args
293 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
295 paDFunType :: TyCon -> VM Type
298 margs <- mapM paDictArgType tvs
299 res <- mkPADictType (mkTyConApp tc arg_tys)
300 return . mkForAllTys tvs
301 $ mkFunTys [arg | Just arg <- margs] res
304 arg_tys = mkTyVarTys tvs
306 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
309 dicts <- mapM paDictOfType tys
310 return $ mkApps (mkTyApps dfun tys) dicts
312 paMethod :: (Builtins -> Var) -> Type -> VM CoreExpr
316 dict <- paDictOfType ty
317 return $ mkApps (Var fn) [Type ty, dict]
319 lengthPA :: CoreExpr -> VM CoreExpr
320 lengthPA x = liftM (`App` x) (paMethod lengthPAVar ty)
322 ty = splitPArrayTy (exprType x)
324 replicatePA :: CoreExpr -> CoreExpr -> VM CoreExpr
325 replicatePA len x = liftM (`mkApps` [len,x])
326 (paMethod replicatePAVar (exprType x))
328 emptyPA :: Type -> VM CoreExpr
329 emptyPA = paMethod emptyPAVar
331 liftPA :: CoreExpr -> VM CoreExpr
334 lc <- builtin liftingContext
335 replicatePA (Var lc) x
337 newLocalVVar :: FastString -> Type -> VM VVar
340 lty <- mkPArrayType vty
341 vv <- newLocalVar fs vty
342 lv <- newLocalVar fs lty
345 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
349 mdicts <- mapM mk_dict_var tvs
350 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
354 r <- paDictArgType tv
356 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
357 Nothing -> return Nothing
359 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
361 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
364 dicts <- mapM paDictOfType tys
365 return $ expr `mkTyApps` tys `mkApps` dicts
367 polyVApply :: VExpr -> [Type] -> VM VExpr
370 dicts <- mapM paDictOfType tys
371 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
373 hoistBinding :: Var -> CoreExpr -> VM ()
374 hoistBinding v e = updGEnv $ \env ->
375 env { global_bindings = (v,e) : global_bindings env }
377 hoistExpr :: FastString -> CoreExpr -> VM Var
380 var <- newLocalVar fs (exprType expr)
381 hoistBinding var expr
384 hoistVExpr :: VExpr -> VM VVar
388 vv <- hoistExpr ('v' `consFS` fs) ve
389 lv <- hoistExpr ('l' `consFS` fs) le
392 hoistPolyVExpr :: [TyVar] -> VM VExpr -> VM VExpr
395 expr <- closedV . polyAbstract tvs $ \abstract ->
396 liftM (mapVect abstract) p
397 fn <- hoistVExpr expr
398 polyVApply (vVar fn) (mkTyVarTys tvs)
400 takeHoisted :: VM [(Var, CoreExpr)]
404 setGEnv $ env { global_bindings = [] }
405 return $ global_bindings env
407 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
408 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
410 dict <- paDictOfType env_ty
411 mkv <- builtin mkClosureVar
412 mkl <- builtin mkClosurePVar
413 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
414 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
416 mkClosureApp :: VExpr -> VExpr -> VM VExpr
417 mkClosureApp (vclo, lclo) (varg, larg)
419 vapply <- builtin applyClosureVar
420 lapply <- builtin applyClosurePVar
421 return (Var vapply `mkTyApps` [arg_ty, res_ty] `mkApps` [vclo, varg],
422 Var lapply `mkTyApps` [arg_ty, res_ty] `mkApps` [lclo, larg])
424 (arg_ty, res_ty) = splitClosureTy (exprType vclo)
426 buildClosures :: [TyVar] -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
427 buildClosures tvs vars [] res_ty mk_body
429 buildClosures tvs vars [arg_ty] res_ty mk_body
430 = buildClosure tvs vars arg_ty res_ty mk_body
431 buildClosures tvs vars (arg_ty : arg_tys) res_ty mk_body
433 res_ty' <- mkClosureTypes arg_tys res_ty
434 arg <- newLocalVVar FSLIT("x") arg_ty
435 buildClosure tvs vars arg_ty res_ty'
438 lc <- builtin liftingContext
439 clo <- buildClosures tvs (vars ++ [arg]) arg_tys res_ty mk_body
440 return $ vLams lc (vars ++ [arg]) clo
442 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
444 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
445 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
447 buildClosure :: [TyVar] -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
448 buildClosure tvs vars arg_ty res_ty mk_body
450 (env_ty, env, bind) <- buildEnv vars
451 env_bndr <- newLocalVVar FSLIT("env") env_ty
452 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
454 fn <- hoistPolyVExpr tvs
456 lc <- builtin liftingContext
458 body' <- bind (vVar env_bndr)
459 (vVarApps lc body (vars ++ [arg_bndr]))
460 return (vLamsWithoutLC [env_bndr, arg_bndr] body')
462 mkClosure arg_ty res_ty env_ty fn env
464 buildEnv :: [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
467 lc <- builtin liftingContext
468 let (ty, venv, vbind) = mkVectEnv tys vs
469 (lenv, lbind) <- mkLiftEnv lc tys ls
470 return (ty, (venv, lenv),
471 \(venv,lenv) (vbody,lbody) ->
473 let vbody' = vbind venv vbody
474 lbody' <- lbind lenv lbody
475 return (vbody', lbody'))
480 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
481 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
482 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
483 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
484 \env body -> Case env (mkWildId ty) (exprType body)
485 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
489 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
490 mkLiftEnv lc [ty] [v]
491 = return (Var v, \env body ->
493 len <- lengthPA (Var v)
494 return . Let (NonRec v env)
495 $ Case len lc (exprType body) [(DEFAULT, [], body)])
497 -- NOTE: this transparently deals with empty environments
500 (env_tc, env_tyargs) <- parrayReprTyCon vty
501 let [env_con] = tyConDataCons env_tc
503 env = Var (dataConWrapId env_con)
504 `mkTyApps` env_tyargs
505 `mkVarApps` (lc : vs)
507 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
509 return $ Case scrut (mkWildId (exprType scrut))
511 [(DataAlt env_con, lc : bndrs, body)]
514 vty = mkCoreTupTy tys
516 bndrs | null vs = [mkWildId unitTy]