import Outputable
import FastString
+import Data.List ( zipWith4 )
import Control.Monad ( liftM, liftM2, zipWithM_ )
collectAnnTypeArgs :: AnnExpr b ann -> (AnnExpr b ann, [Type])
| otherwise = pprPanic s (ppr ty)
-splitCrossTy :: Type -> (Type, Type)
-splitCrossTy = splitBinTy "splitCrossTy" ndpCrossTyConName
+splitFixedTyConApp :: TyCon -> Type -> [Type]
+splitFixedTyConApp tc ty
+ | Just (tc', tys) <- splitTyConApp_maybe ty
+ , tc == tc'
+ = tys
-splitPlusTy :: Type -> (Type, Type)
-splitPlusTy = splitBinTy "splitSumTy" ndpPlusTyConName
+ | otherwise = pprPanic "splitFixedTyConApp" (ppr tc <+> ppr ty)
splitEmbedTy :: Type -> Type
splitEmbedTy = splitUnTy "splitEmbedTy" embedTyConName
mk tc ty1 ty2 = mkTyConApp tc [ty1,ty2]
mkPRepr :: [[Type]] -> VM Type
-mkPRepr [] = return unitTy
mkPRepr tys
= do
- embed <- builtin embedTyCon
- cross <- builtin crossTyCon
- plus <- builtin plusTyCon
+ embed_tc <- builtin embedTyCon
+ sum_tcs <- builtins sumTyCon
+ prod_tcs <- builtins prodTyCon
- let mk_embed ty = mkTyConApp embed [ty]
- mk_cross ty1 ty2 = mkTyConApp cross [ty1, ty2]
- mk_plus ty1 ty2 = mkTyConApp plus [ty1, ty2]
+ let mk_sum [] = unitTy
+ mk_sum [ty] = ty
+ mk_sum tys = mkTyConApp (sum_tcs $ length tys) tys
- mk_tup [] = unitTy
- mk_tup tys = foldr1 mk_cross tys
+ mk_prod [] = unitTy
+ mk_prod [ty] = ty
+ mk_prod tys = mkTyConApp (prod_tcs $ length tys) tys
- mk_sum [] = unitTy
- mk_sum tys = foldr1 mk_plus tys
+ mk_embed ty = mkTyConApp embed_tc [ty]
return . mk_sum
- . map (mk_tup . map mk_embed)
+ . map (mk_prod . map mk_embed)
$ tys
mkToPRepr :: [[CoreExpr]] -> VM ([CoreExpr], Type)
= do
embed_tc <- builtin embedTyCon
embed_dc <- builtin embedDataCon
- cross_tc <- builtin crossTyCon
- cross_dc <- builtin crossDataCon
- plus_tc <- builtin plusTyCon
- left_dc <- builtin leftDataCon
- right_dc <- builtin rightDataCon
-
- let mk_embed expr
- = (mkConApp embed_dc [Type ty, expr],
- mkTyConApp embed_tc [ty])
- where ty = exprType expr
-
- mk_cross (expr1, ty1) (expr2, ty2)
- = (mkConApp cross_dc [Type ty1, Type ty2, expr1, expr2],
- mkTyConApp cross_tc [ty1, ty2])
-
- mk_tup [] = (Var unitDataConId, unitTy)
- mk_tup es = foldr1 mk_cross es
+ sum_tcs <- builtins sumTyCon
+ prod_tcs <- builtins prodTyCon
- mk_sum [] = ([Var unitDataConId], unitTy)
+ let mk_sum [] = ([Var unitDataConId], unitTy)
mk_sum [(expr, ty)] = ([expr], ty)
- mk_sum ((expr, lty) : es)
- = let (alts, rty) = mk_sum es
- in
- (mkConApp left_dc [Type lty, Type rty, expr]
- : [mkConApp right_dc [Type lty, Type rty, alt] | alt <- alts],
- mkTyConApp plus_tc [lty, rty])
+ mk_sum es = (zipWith mk_alt (tyConDataCons sum_tc) exprs,
+ mkTyConApp sum_tc tys)
+ where
+ (exprs, tys) = unzip es
+ sum_tc = sum_tcs (length es)
+ mk_alt dc expr = mkConApp dc (map Type tys ++ [expr])
+
+ mk_prod [] = (Var unitDataConId, unitTy)
+ mk_prod [(expr, ty)] = (expr, ty)
+ mk_prod es = (mkConApp prod_dc (map Type tys ++ exprs),
+ mkTyConApp prod_tc tys)
+ where
+ (exprs, tys) = unzip es
+ prod_tc = prod_tcs (length es)
+ [prod_dc] = tyConDataCons prod_tc
+
+ mk_embed expr = (mkConApp embed_dc [Type ty, expr],
+ mkTyConApp embed_tc [ty])
+ where ty = exprType expr
- return . mk_sum $ map (mk_tup . map mk_embed) ess
+ return . mk_sum $ map (mk_prod . map mk_embed) ess
mkFromPRepr :: CoreExpr -> Type -> [([Var], CoreExpr)] -> VM CoreExpr
mkFromPRepr scrut res_ty alts
= do
embed_dc <- builtin embedDataCon
- cross_dc <- builtin crossDataCon
- left_dc <- builtin leftDataCon
- right_dc <- builtin rightDataCon
- pa_tc <- builtin paTyCon
+ sum_tcs <- builtins sumTyCon
+ prod_tcs <- builtins prodTyCon
- let un_embed expr ty var res
- = Case expr (mkWildId ty) res_ty
- [(DataAlt embed_dc, [var], res)]
-
- un_cross expr ty var1 var2 res
- = Case expr (mkWildId ty) res_ty
- [(DataAlt cross_dc, [var1, var2], res)]
-
- un_tup expr ty [] res = return res
- un_tup expr ty [var] res = return $ un_embed expr ty var res
- un_tup expr ty (var : vars) res
+ let un_sum expr ty [(vars, res)] = un_prod expr ty vars res
+ un_sum expr ty bs
= do
- lv <- newLocalVar FSLIT("x") lty
- rv <- newLocalVar FSLIT("y") rty
- liftM (un_cross expr ty lv rv
- . un_embed (Var lv) lty var)
- (un_tup (Var rv) rty vars res)
+ ps <- mapM (newLocalVar FSLIT("p")) tys
+ bodies <- sequence
+ $ zipWith4 un_prod (map Var ps) tys vars rs
+ return . Case expr (mkWildId ty) res_ty
+ $ zipWith3 mk_alt sum_dcs ps bodies
where
- (lty, rty) = splitCrossTy ty
+ (vars, rs) = unzip bs
+ tys = splitFixedTyConApp sum_tc ty
+ sum_tc = sum_tcs $ length bs
+ sum_dcs = tyConDataCons sum_tc
- un_plus expr ty var1 var2 res1 res2
- = Case expr (mkWildId ty) res_ty
- [(DataAlt left_dc, [var1], res1),
- (DataAlt right_dc, [var2], res2)]
+ mk_alt dc p body = (DataAlt dc, [p], body)
- un_sum expr ty [(vars, res)] = un_tup expr ty vars res
- un_sum expr ty ((vars, res) : alts)
+ un_prod expr ty [] r = return r
+ un_prod expr ty [var] r = return $ un_embed expr ty var r
+ un_prod expr ty vars r
= do
- lv <- newLocalVar FSLIT("l") lty
- rv <- newLocalVar FSLIT("r") rty
- liftM2 (un_plus expr ty lv rv)
- (un_tup (Var lv) lty vars res)
- (un_sum (Var rv) rty alts)
+ xs <- mapM (newLocalVar FSLIT("x")) tys
+ let body = foldr (\(e,t,v) r -> un_embed e t v r) r
+ $ zip3 (map Var xs) tys vars
+ return $ Case expr (mkWildId ty) res_ty
+ [(DataAlt prod_dc, xs, body)]
where
- (lty, rty) = splitPlusTy ty
+ tys = splitFixedTyConApp prod_tc ty
+ prod_tc = prod_tcs $ length vars
+ [prod_dc] = tyConDataCons prod_tc
+
+ un_embed expr ty var r
+ = Case expr (mkWildId ty) res_ty
+ [(DataAlt embed_dc, [var], r)]
un_sum scrut (exprType scrut) alts
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