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
156 let mk_embed (expr, ty, pa)
157 = (mkConApp embed_dc [Type ty, pa, expr],
158 mkTyConApp embed_tc [ty])
160 mk_cross (expr1, ty1) (expr2, ty2)
161 = (mkConApp cross_dc [Type ty1, Type ty2, expr1, expr2],
162 mkTyConApp cross_tc [ty1, ty2])
164 mk_tup [] = (Var unitDataConId, unitTy)
165 mk_tup es = foldr1 mk_cross es
167 mk_sum [] = ([Var unitDataConId], unitTy)
168 mk_sum [(expr, ty)] = ([expr], ty)
169 mk_sum ((expr, lty) : es)
170 = let (alts, rty) = mk_sum es
172 (mkConApp left_dc [Type lty, Type rty, expr]
173 : [mkConApp right_dc [Type lty, Type rty, alt] | alt <- alts],
174 mkTyConApp plus_tc [lty, rty])
176 liftM (mk_sum . map (mk_tup . map mk_embed))
177 (mapM (mapM init) ess)
179 init expr = let ty = exprType expr
181 pa <- paDictOfType ty
182 return (expr, ty, pa)
184 mkFromPRepr :: CoreExpr -> Type -> [([Var], CoreExpr)] -> VM CoreExpr
185 mkFromPRepr scrut res_ty alts
187 embed_dc <- builtin embedDataCon
188 cross_dc <- builtin crossDataCon
189 left_dc <- builtin leftDataCon
190 right_dc <- builtin rightDataCon
191 pa_tc <- builtin paTyCon
193 let un_embed expr ty var res
195 pa <- newLocalVar FSLIT("pa") (mkTyConApp pa_tc [idType var])
196 return $ Case expr (mkWildId ty) res_ty
197 [(DataAlt embed_dc, [pa, var], res)]
199 un_cross expr ty var1 var2 res
200 = Case expr (mkWildId ty) res_ty
201 [(DataAlt cross_dc, [var1, var2], res)]
203 un_tup expr ty [] res = return res
204 un_tup expr ty [var] res = un_embed expr ty var res
205 un_tup expr ty (var : vars) res
207 lv <- newLocalVar FSLIT("x") lty
208 rv <- newLocalVar FSLIT("y") rty
209 liftM (un_cross expr ty lv rv)
210 (un_embed (Var lv) lty var
211 =<< un_tup (Var rv) rty vars res)
213 (lty, rty) = splitCrossTy ty
215 un_plus expr ty var1 var2 res1 res2
216 = Case expr (mkWildId ty) res_ty
217 [(DataAlt left_dc, [var1], res1),
218 (DataAlt right_dc, [var2], res2)]
220 un_sum expr ty [(vars, res)] = un_tup expr ty vars res
221 un_sum expr ty ((vars, res) : alts)
223 lv <- newLocalVar FSLIT("l") lty
224 rv <- newLocalVar FSLIT("r") rty
225 liftM2 (un_plus expr ty lv rv)
226 (un_tup (Var lv) lty vars res)
227 (un_sum (Var rv) rty alts)
229 (lty, rty) = splitPlusTy ty
231 un_sum scrut (exprType scrut) alts
233 mkClosureType :: Type -> Type -> VM Type
234 mkClosureType arg_ty res_ty = mkBuiltinTyConApp closureTyCon [arg_ty, res_ty]
236 mkClosureTypes :: [Type] -> Type -> VM Type
237 mkClosureTypes = mkBuiltinTyConApps closureTyCon
239 mkPReprType :: Type -> VM Type
240 mkPReprType ty = mkBuiltinTyConApp preprTyCon [ty]
242 mkPADictType :: Type -> VM Type
243 mkPADictType ty = mkBuiltinTyConApp paTyCon [ty]
245 mkPArrayType :: Type -> VM Type
246 mkPArrayType ty = mkBuiltinTyConApp parrayTyCon [ty]
248 parrayReprTyCon :: Type -> VM (TyCon, [Type])
249 parrayReprTyCon ty = builtin parrayTyCon >>= (`lookupFamInst` [ty])
251 parrayReprDataCon :: Type -> VM (DataCon, [Type])
254 (tc, arg_tys) <- parrayReprTyCon ty
255 let [dc] = tyConDataCons tc
258 mkVScrut :: VExpr -> VM (VExpr, TyCon, [Type])
261 (tc, arg_tys) <- parrayReprTyCon (exprType ve)
262 return ((ve, unwrapFamInstScrut tc arg_tys le), tc, arg_tys)
264 paDictArgType :: TyVar -> VM (Maybe Type)
265 paDictArgType tv = go (TyVarTy tv) (tyVarKind tv)
267 go ty k | Just k' <- kindView k = go ty k'
270 tv <- newTyVar FSLIT("a") k1
271 mty1 <- go (TyVarTy tv) k1
274 mty2 <- go (AppTy ty (TyVarTy tv)) k2
275 return $ fmap (ForAllTy tv . FunTy ty1) mty2
280 = liftM Just (mkPADictType ty)
282 go ty k = return Nothing
284 paDictOfType :: Type -> VM CoreExpr
285 paDictOfType ty = paDictOfTyApp ty_fn ty_args
287 (ty_fn, ty_args) = splitAppTys ty
289 paDictOfTyApp :: Type -> [Type] -> VM CoreExpr
290 paDictOfTyApp ty_fn ty_args
291 | Just ty_fn' <- coreView ty_fn = paDictOfTyApp ty_fn' ty_args
292 paDictOfTyApp (TyVarTy tv) ty_args
294 dfun <- maybeV (lookupTyVarPA tv)
295 paDFunApply dfun ty_args
296 paDictOfTyApp (TyConApp tc _) ty_args
298 dfun <- traceMaybeV "paDictOfTyApp" (ppr tc) (lookupTyConPA tc)
299 paDFunApply (Var dfun) ty_args
300 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)
302 paDFunType :: TyCon -> VM Type
305 margs <- mapM paDictArgType tvs
306 res <- mkPADictType (mkTyConApp tc arg_tys)
307 return . mkForAllTys tvs
308 $ mkFunTys [arg | Just arg <- margs] res
311 arg_tys = mkTyVarTys tvs
313 paDFunApply :: CoreExpr -> [Type] -> VM CoreExpr
316 dicts <- mapM paDictOfType tys
317 return $ mkApps (mkTyApps dfun tys) dicts
319 paMethod :: (Builtins -> Var) -> Type -> VM CoreExpr
323 dict <- paDictOfType ty
324 return $ mkApps (Var fn) [Type ty, dict]
326 lengthPA :: CoreExpr -> VM CoreExpr
327 lengthPA x = liftM (`App` x) (paMethod lengthPAVar ty)
329 ty = splitPArrayTy (exprType x)
331 replicatePA :: CoreExpr -> CoreExpr -> VM CoreExpr
332 replicatePA len x = liftM (`mkApps` [len,x])
333 (paMethod replicatePAVar (exprType x))
335 emptyPA :: Type -> VM CoreExpr
336 emptyPA = paMethod emptyPAVar
338 liftPA :: CoreExpr -> VM CoreExpr
341 lc <- builtin liftingContext
342 replicatePA (Var lc) x
344 newLocalVVar :: FastString -> Type -> VM VVar
347 lty <- mkPArrayType vty
348 vv <- newLocalVar fs vty
349 lv <- newLocalVar fs lty
352 polyAbstract :: [TyVar] -> ((CoreExpr -> CoreExpr) -> VM a) -> VM a
356 mdicts <- mapM mk_dict_var tvs
357 zipWithM_ (\tv -> maybe (defLocalTyVar tv) (defLocalTyVarWithPA tv . Var)) tvs mdicts
361 r <- paDictArgType tv
363 Just ty -> liftM Just (newLocalVar FSLIT("dPA") ty)
364 Nothing -> return Nothing
366 mk_lams mdicts = mkLams (tvs ++ [dict | Just dict <- mdicts])
368 polyApply :: CoreExpr -> [Type] -> VM CoreExpr
371 dicts <- mapM paDictOfType tys
372 return $ expr `mkTyApps` tys `mkApps` dicts
374 polyVApply :: VExpr -> [Type] -> VM VExpr
377 dicts <- mapM paDictOfType tys
378 return $ mapVect (\e -> e `mkTyApps` tys `mkApps` dicts) expr
380 hoistBinding :: Var -> CoreExpr -> VM ()
381 hoistBinding v e = updGEnv $ \env ->
382 env { global_bindings = (v,e) : global_bindings env }
384 hoistExpr :: FastString -> CoreExpr -> VM Var
387 var <- newLocalVar fs (exprType expr)
388 hoistBinding var expr
391 hoistVExpr :: VExpr -> VM VVar
395 vv <- hoistExpr ('v' `consFS` fs) ve
396 lv <- hoistExpr ('l' `consFS` fs) le
399 hoistPolyVExpr :: [TyVar] -> VM VExpr -> VM VExpr
402 expr <- closedV . polyAbstract tvs $ \abstract ->
403 liftM (mapVect abstract) p
404 fn <- hoistVExpr expr
405 polyVApply (vVar fn) (mkTyVarTys tvs)
407 takeHoisted :: VM [(Var, CoreExpr)]
411 setGEnv $ env { global_bindings = [] }
412 return $ global_bindings env
414 mkClosure :: Type -> Type -> Type -> VExpr -> VExpr -> VM VExpr
415 mkClosure arg_ty res_ty env_ty (vfn,lfn) (venv,lenv)
417 dict <- paDictOfType env_ty
418 mkv <- builtin mkClosureVar
419 mkl <- builtin mkClosurePVar
420 return (Var mkv `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, venv],
421 Var mkl `mkTyApps` [arg_ty, res_ty, env_ty] `mkApps` [dict, vfn, lfn, lenv])
423 mkClosureApp :: VExpr -> VExpr -> VM VExpr
424 mkClosureApp (vclo, lclo) (varg, larg)
426 vapply <- builtin applyClosureVar
427 lapply <- builtin applyClosurePVar
428 return (Var vapply `mkTyApps` [arg_ty, res_ty] `mkApps` [vclo, varg],
429 Var lapply `mkTyApps` [arg_ty, res_ty] `mkApps` [lclo, larg])
431 (arg_ty, res_ty) = splitClosureTy (exprType vclo)
433 buildClosures :: [TyVar] -> [VVar] -> [Type] -> Type -> VM VExpr -> VM VExpr
434 buildClosures tvs vars [] res_ty mk_body
436 buildClosures tvs vars [arg_ty] res_ty mk_body
437 = buildClosure tvs vars arg_ty res_ty mk_body
438 buildClosures tvs vars (arg_ty : arg_tys) res_ty mk_body
440 res_ty' <- mkClosureTypes arg_tys res_ty
441 arg <- newLocalVVar FSLIT("x") arg_ty
442 buildClosure tvs vars arg_ty res_ty'
445 lc <- builtin liftingContext
446 clo <- buildClosures tvs (vars ++ [arg]) arg_tys res_ty mk_body
447 return $ vLams lc (vars ++ [arg]) clo
449 -- (clo <x1,...,xn> <f,f^>, aclo (Arr lc xs1 ... xsn) <f,f^>)
451 -- f = \env v -> case env of <x1,...,xn> -> e x1 ... xn v
452 -- f^ = \env v -> case env of Arr l xs1 ... xsn -> e^ l x1 ... xn v
454 buildClosure :: [TyVar] -> [VVar] -> Type -> Type -> VM VExpr -> VM VExpr
455 buildClosure tvs vars arg_ty res_ty mk_body
457 (env_ty, env, bind) <- buildEnv vars
458 env_bndr <- newLocalVVar FSLIT("env") env_ty
459 arg_bndr <- newLocalVVar FSLIT("arg") arg_ty
461 fn <- hoistPolyVExpr tvs
463 lc <- builtin liftingContext
465 body' <- bind (vVar env_bndr)
466 (vVarApps lc body (vars ++ [arg_bndr]))
467 return (vLamsWithoutLC [env_bndr, arg_bndr] body')
469 mkClosure arg_ty res_ty env_ty fn env
471 buildEnv :: [VVar] -> VM (Type, VExpr, VExpr -> VExpr -> VM VExpr)
474 lc <- builtin liftingContext
475 let (ty, venv, vbind) = mkVectEnv tys vs
476 (lenv, lbind) <- mkLiftEnv lc tys ls
477 return (ty, (venv, lenv),
478 \(venv,lenv) (vbody,lbody) ->
480 let vbody' = vbind venv vbody
481 lbody' <- lbind lenv lbody
482 return (vbody', lbody'))
487 mkVectEnv :: [Type] -> [Var] -> (Type, CoreExpr, CoreExpr -> CoreExpr -> CoreExpr)
488 mkVectEnv [] [] = (unitTy, Var unitDataConId, \env body -> body)
489 mkVectEnv [ty] [v] = (ty, Var v, \env body -> Let (NonRec v env) body)
490 mkVectEnv tys vs = (ty, mkCoreTup (map Var vs),
491 \env body -> Case env (mkWildId ty) (exprType body)
492 [(DataAlt (tupleCon Boxed (length vs)), vs, body)])
496 mkLiftEnv :: Var -> [Type] -> [Var] -> VM (CoreExpr, CoreExpr -> CoreExpr -> VM CoreExpr)
497 mkLiftEnv lc [ty] [v]
498 = return (Var v, \env body ->
500 len <- lengthPA (Var v)
501 return . Let (NonRec v env)
502 $ Case len lc (exprType body) [(DEFAULT, [], body)])
504 -- NOTE: this transparently deals with empty environments
507 (env_tc, env_tyargs) <- parrayReprTyCon vty
508 let [env_con] = tyConDataCons env_tc
510 env = Var (dataConWrapId env_con)
511 `mkTyApps` env_tyargs
512 `mkVarApps` (lc : vs)
514 bind env body = let scrut = unwrapFamInstScrut env_tc env_tyargs env
516 return $ Case scrut (mkWildId (exprType scrut))
518 [(DataAlt env_con, lc : bndrs, body)]
521 vty = mkCoreTupTy tys
523 bndrs | null vs = [mkWildId unitTy]