import HscTypes
import PrelInfo
import PrelNames
-import MkId
import PrimOp
import SrcLoc
import TyCon
import MonadUtils
import Outputable
import FastString
-import OccName
import Bag
-
import Data.List ( partition, intersperse )
\end{code}
| Just (con, prim_tc) <- primWrapperType_maybe tycon
= gen_PrimOrd_binds con prim_tc
- | otherwise
+ | otherwise
= (unitBag compare, aux_binds)
- -- `AndMonoBinds` compare
- -- The default declaration in PrelBase handles this
+ -- `AndMonoBinds` compare
+ -- The default declaration in PrelBase handles this
where
aux_binds | single_con_type = []
- | otherwise = [GenCon2Tag tycon]
+ | otherwise = [GenCon2Tag tycon]
compare = L loc (mkFunBind (L loc compare_RDR) compare_matches)
compare_matches = [mkMatch [a_Pat, b_Pat] compare_rhs cmp_eq_binds]
cmp_eq_binds = HsValBinds (ValBindsIn (unitBag cmp_eq) [])
compare_rhs
- | single_con_type = cmp_eq_Expr a_Expr b_Expr
- | otherwise
- = untag_Expr tycon [(a_RDR, ah_RDR), (b_RDR, bh_RDR)]
- (cmp_tags_Expr eqInt_RDR ah_RDR bh_RDR
- (cmp_eq_Expr a_Expr b_Expr) -- True case
- -- False case; they aren't equal
- -- So we need to do a less-than comparison on the tags
- (cmp_tags_Expr ltInt_RDR ah_RDR bh_RDR ltTag_Expr gtTag_Expr))
+ | single_con_type = cmp_eq_Expr a_Expr b_Expr
+ | otherwise
+ = untag_Expr tycon [(a_RDR, ah_RDR), (b_RDR, bh_RDR)]
+ (cmp_tags_Expr eqInt_RDR ah_RDR bh_RDR
+ (cmp_eq_Expr a_Expr b_Expr) -- True case
+ -- False case; they aren't equal
+ -- So we need to do a less-than comparison on the tags
+ (cmp_tags_Expr ltInt_RDR ah_RDR bh_RDR
+ ltTag_Expr gtTag_Expr))
tycon_data_cons = tyConDataCons tycon
single_con_type = isSingleton tycon_data_cons
(nullary_cons, nonnullary_cons)
| isNewTyCon tycon = ([], tyConDataCons tycon)
- | otherwise = partition isNullarySrcDataCon tycon_data_cons
+ | otherwise = partition isNullarySrcDataCon tycon_data_cons
cmp_eq = mk_FunBind loc cmp_eq_RDR cmp_eq_match
cmp_eq_match
| isEnumerationTyCon tycon
- -- We know the tags are equal, so if it's an enumeration TyCon,
- -- then there is nothing left to do
- -- Catch this specially to avoid warnings
- -- about overlapping patterns from the desugarer,
- -- and to avoid unnecessary pattern-matching
+ -- We know the tags are equal, so if it's an
+ -- enumeration TyCon,
+ -- then there is nothing left to do
+ -- Catch this specially to avoid warnings
+ -- about overlapping patterns from the desugarer,
+ -- and to avoid unnecessary pattern-matching
= [([nlWildPat,nlWildPat], eqTag_Expr)]
| otherwise
= map pats_etc nonnullary_cons ++
- (if single_con_type then -- Omit wildcards when there's just one
- [] -- constructor, to silence desugarer
- else
+ (if single_con_type then -- Omit wildcards when there's just one
+ [] -- constructor, to silence desugarer
+ else
[([nlWildPat, nlWildPat], default_rhs)])
- default_rhs | null nullary_cons = impossible_Expr -- Keep desugarer from complaining about
- -- inexhaustive patterns
- | otherwise = eqTag_Expr -- Some nullary constructors;
- -- Tags are equal, no args => return EQ
+ default_rhs | null nullary_cons = -- Keep desugarer from complaining about
+ -- inexhaustive patterns
+ impossible_Expr
+ | otherwise = -- Some nullary constructors;
+ -- Tags are equal, no args => return EQ
+ eqTag_Expr
pats_etc data_con
- = ([con1_pat, con2_pat],
- nested_compare_expr tys_needed as_needed bs_needed)
- where
- con1_pat = nlConVarPat data_con_RDR as_needed
- con2_pat = nlConVarPat data_con_RDR bs_needed
-
- data_con_RDR = getRdrName data_con
- con_arity = length tys_needed
- as_needed = take con_arity as_RDRs
- bs_needed = take con_arity bs_RDRs
- tys_needed = dataConOrigArgTys data_con
-
- nested_compare_expr [ty] [a] [b]
- = careful_compare_Case tycon ty eqTag_Expr (nlHsVar a) (nlHsVar b)
-
- nested_compare_expr (ty:tys) (a:as) (b:bs)
- = let eq_expr = nested_compare_expr tys as bs
- in careful_compare_Case tycon ty eq_expr (nlHsVar a) (nlHsVar b)
-
- nested_compare_expr _ _ _ = panic "nested_compare_expr" -- Args always equal length
+ = ([con1_pat, con2_pat],
+ nested_compare_expr tys_needed as_needed bs_needed)
+ where
+ con1_pat = nlConVarPat data_con_RDR as_needed
+ con2_pat = nlConVarPat data_con_RDR bs_needed
+
+ data_con_RDR = getRdrName data_con
+ con_arity = length tys_needed
+ as_needed = take con_arity as_RDRs
+ bs_needed = take con_arity bs_RDRs
+ tys_needed = dataConOrigArgTys data_con
+
+ nested_compare_expr [ty] [a] [b]
+ = careful_compare_Case tycon ty eqTag_Expr (nlHsVar a) (nlHsVar b)
+
+ nested_compare_expr (ty:tys) (a:as) (b:bs)
+ = let eq_expr = nested_compare_expr tys as bs
+ in careful_compare_Case tycon ty eq_expr (nlHsVar a) (nlHsVar b)
+
+ -- Args always equal length
+ nested_compare_expr _ _ _ = panic "nested_compare_expr"
\end{code}
Note [Comparision of primitive types]
data_cons = tyConDataCons tycon
----- enum-flavored: ---------------------------
- min_bound_enum = mkVarBind loc minBound_RDR (nlHsVar data_con_1_RDR)
- max_bound_enum = mkVarBind loc maxBound_RDR (nlHsVar data_con_N_RDR)
+ min_bound_enum = mkHsVarBind loc minBound_RDR (nlHsVar data_con_1_RDR)
+ max_bound_enum = mkHsVarBind loc maxBound_RDR (nlHsVar data_con_N_RDR)
data_con_1 = head data_cons
data_con_N = last data_cons
----- single-constructor-flavored: -------------
arity = dataConSourceArity data_con_1
- min_bound_1con = mkVarBind loc minBound_RDR $
+ min_bound_1con = mkHsVarBind loc minBound_RDR $
nlHsVarApps data_con_1_RDR (nOfThem arity minBound_RDR)
- max_bound_1con = mkVarBind loc maxBound_RDR $
+ max_bound_1con = mkHsVarBind loc maxBound_RDR $
nlHsVarApps data_con_1_RDR (nOfThem arity maxBound_RDR)
\end{code}
mk_qual a b c = noLoc $ mkBindStmt (nlVarPat c)
(nlHsApp (nlHsVar range_RDR)
- (nlTuple [nlHsVar a, nlHsVar b] Boxed))
+ (mkLHsVarTuple [a,b]))
----------------
single_con_index
) plus_RDR (
genOpApp (
(nlHsApp (nlHsVar unsafeRangeSize_RDR)
- (nlTuple [nlHsVar l, nlHsVar u] Boxed))
+ (mkLHsVarTuple [l,u]))
) times_RDR (mk_index rest)
)
mk_one l u i
- = nlHsApps unsafeIndex_RDR [nlTuple [nlHsVar l, nlHsVar u] Boxed, nlHsVar i]
+ = nlHsApps unsafeIndex_RDR [mkLHsVarTuple [l,u], nlHsVar i]
------------------
single_con_inRange
con_pat cs_needed] $
foldl1 and_Expr (zipWith3Equal "single_con_inRange" in_range as_needed bs_needed cs_needed)
where
- in_range a b c = nlHsApps inRange_RDR [nlTuple [nlHsVar a, nlHsVar b] Boxed,
- nlHsVar c]
+ in_range a b c = nlHsApps inRange_RDR [mkLHsVarTuple [a,b], nlHsVar c]
\end{code}
%************************************************************************
where
-----------------------------------------------------------------------
default_readlist
- = mkVarBind loc readList_RDR (nlHsVar readListDefault_RDR)
+ = mkHsVarBind loc readList_RDR (nlHsVar readListDefault_RDR)
default_readlistprec
- = mkVarBind loc readListPrec_RDR (nlHsVar readListPrecDefault_RDR)
+ = mkHsVarBind loc readListPrec_RDR (nlHsVar readListPrecDefault_RDR)
-----------------------------------------------------------------------
data_cons = tyConDataCons tycon
(nullary_cons, non_nullary_cons) = partition isNullarySrcDataCon data_cons
- read_prec = mkVarBind loc readPrec_RDR
+ read_prec = mkHsVarBind loc readPrec_RDR
(nlHsApp (nlHsVar parens_RDR) read_cons)
read_cons = foldr1 mk_alt (read_nullary_cons ++ read_non_nullary_cons)
_ -> [nlHsApp (nlHsVar choose_RDR)
(nlList (map mk_pair nullary_cons))]
- mk_pair con = nlTuple [nlHsLit (mkHsString (data_con_str con)),
- result_expr con []]
- Boxed
+ mk_pair con = mkLHsTupleExpr [nlHsLit (mkHsString (data_con_str con)),
+ result_expr con []]
read_non_nullary_con data_con
| is_infix = mk_parser infix_prec infix_stmts body
= (listToBag [shows_prec, show_list], [])
where
-----------------------------------------------------------------------
- show_list = mkVarBind loc showList_RDR
+ show_list = mkHsVarBind loc showList_RDR
(nlHsApp (nlHsVar showList___RDR) (nlHsPar (nlHsApp (nlHsVar showsPrec_RDR) (nlHsIntLit 0))))
-----------------------------------------------------------------------
shows_prec = mk_FunBind loc showsPrec_RDR (map pats_etc (tyConDataCons tycon))
[nlWildPat]
(nlHsApps mkTypeRep_RDR [tycon_rep, nlList []])
where
- tycon_rep = nlHsVar mkTyConRep_RDR `nlHsApp` nlHsLit (mkHsString (showSDoc (ppr tycon)))
+ tycon_rep = nlHsVar mkTyConRep_RDR `nlHsApp` nlHsLit (mkHsString (showSDocOneLine (ppr tycon)))
mk_typeOf_RDR :: TyCon -> RdrName
-- Use the arity of the TyCon to make the right typeOfn function
dataTypeOf _ = $dT
+ dataCast1 = gcast1 -- If T :: * -> *
+ dataCast2 = gcast2 -- if T :: * -> * -> *
+
+
\begin{code}
gen_Data_binds :: SrcSpan
-> TyCon
-> (LHsBinds RdrName, -- The method bindings
DerivAuxBinds) -- Auxiliary bindings
gen_Data_binds loc tycon
- = (listToBag [gfoldl_bind, gunfold_bind, toCon_bind, dataTypeOf_bind],
+ = (listToBag [gfoldl_bind, gunfold_bind, toCon_bind, dataTypeOf_bind]
+ `unionBags` gcast_binds,
-- Auxiliary definitions: the data type and constructors
MkTyCon tycon : map MkDataCon data_cons)
where
[nlWildPat]
(nlHsVar (mk_data_type_name tycon))
+ ------------ gcast1/2
+ tycon_kind = tyConKind tycon
+ gcast_binds | tycon_kind `eqKind` kind1 = mk_gcast dataCast1_RDR gcast1_RDR
+ | tycon_kind `eqKind` kind2 = mk_gcast dataCast2_RDR gcast2_RDR
+ | otherwise = emptyBag
+ mk_gcast dataCast_RDR gcast_RDR
+ = unitBag (mk_easy_FunBind loc dataCast_RDR [nlVarPat f_RDR]
+ (nlHsVar gcast_RDR `nlHsApp` nlHsVar f_RDR))
+
+
+kind1, kind2 :: Kind
+kind1 = liftedTypeKind `mkArrowKind` liftedTypeKind
+kind2 = liftedTypeKind `mkArrowKind` kind1
gfoldl_RDR, gunfold_RDR, toConstr_RDR, dataTypeOf_RDR, mkConstr_RDR,
- mkDataType_RDR, conIndex_RDR, prefix_RDR, infix_RDR :: RdrName
+ mkDataType_RDR, conIndex_RDR, prefix_RDR, infix_RDR,
+ dataCast1_RDR, dataCast2_RDR, gcast1_RDR, gcast2_RDR :: RdrName
gfoldl_RDR = varQual_RDR gENERICS (fsLit "gfoldl")
gunfold_RDR = varQual_RDR gENERICS (fsLit "gunfold")
toConstr_RDR = varQual_RDR gENERICS (fsLit "toConstr")
dataTypeOf_RDR = varQual_RDR gENERICS (fsLit "dataTypeOf")
+dataCast1_RDR = varQual_RDR gENERICS (fsLit "dataCast1")
+dataCast2_RDR = varQual_RDR gENERICS (fsLit "dataCast2")
+gcast1_RDR = varQual_RDR tYPEABLE (fsLit "gcast1")
+gcast2_RDR = varQual_RDR tYPEABLE (fsLit "gcast2")
mkConstr_RDR = varQual_RDR gENERICS (fsLit "mkConstr")
mkDataType_RDR = varQual_RDR gENERICS (fsLit "mkDataType")
conIndex_RDR = varQual_RDR gENERICS (fsLit "constrIndex")
%************************************************************************
%* *
- Functor instances
+ Functor instances
+
+ see http://www.mail-archive.com/haskell-prime@haskell.org/msg02116.html
+
%* *
%************************************************************************
%************************************************************************
%* *
- Foldable instances
+ Foldable instances
+
+ see http://www.mail-archive.com/haskell-prime@haskell.org/msg02116.html
+
%* *
%************************************************************************
where
data_cons = tyConDataCons tycon
- foldr_bind = L loc $ mkFunBind (L loc foldr_RDR) (map foldr_eqn data_cons)
+ foldr_bind = L loc $ mkFunBind (L loc foldable_foldr_RDR) (map foldr_eqn data_cons)
foldr_eqn con = evalState (match_for_con z_Expr [f_Pat,z_Pat] con parts) bs_RDRs
where
parts = foldDataConArgs ft_foldr con
%************************************************************************
%* *
- Traversable instances
+ Traversable instances
+
+ see http://www.mail-archive.com/haskell-prime@haskell.org/msg02116.html
%* *
%************************************************************************
get_tag_rhs = L loc $ ExprWithTySig
(nlHsLam (mkSimpleHsAlt (nlVarPat a_RDR)
(nlHsApp (nlHsVar getTag_RDR) a_Expr)))
- (noLoc (mkExplicitHsForAllTy (map (noLoc.UserTyVar) tvs) (noLoc []) con2tag_ty))
+ (noLoc (mkExplicitHsForAllTy (userHsTyVarBndrs (map noLoc tvs))
+ (noLoc []) con2tag_ty))
con2tag_ty = nlHsTyConApp (getRdrName tycon) (map nlHsTyVar tvs)
`nlHsFunTy`
rdr_name = tag2con_RDR tycon
genAuxBind loc (GenMaxTag tycon)
- = mkVarBind loc rdr_name
+ = mkHsVarBind loc rdr_name
(nlHsApp (nlHsVar intDataCon_RDR) (nlHsLit (HsIntPrim max_tag)))
where
rdr_name = maxtag_RDR tycon
data_cons -> toInteger ((length data_cons) - fIRST_TAG)
genAuxBind loc (MkTyCon tycon) -- $dT
- = mkVarBind loc (mk_data_type_name tycon)
- ( nlHsVar mkDataType_RDR
- `nlHsApp` nlHsLit (mkHsString (showSDoc (ppr tycon)))
+ = mkHsVarBind loc (mk_data_type_name tycon)
+ ( nlHsVar mkDataType_RDR
+ `nlHsApp` nlHsLit (mkHsString (showSDocOneLine (ppr tycon)))
`nlHsApp` nlList constrs )
where
constrs = [nlHsVar (mk_constr_name con) | con <- tyConDataCons tycon]
genAuxBind loc (MkDataCon dc) -- $cT1 etc
- = mkVarBind loc (mk_constr_name dc)
- (nlHsApps mkConstr_RDR constr_args)
+ = mkHsVarBind loc (mk_constr_name dc)
+ (nlHsApps mkConstr_RDR constr_args)
where
constr_args
= [ -- nlHsIntLit (toInteger (dataConTag dc)), -- Tag
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