import HsSyn ( InPat(..), HsExpr(..), MonoBinds(..),
Match(..), GRHSs(..), Stmt(..), HsLit(..),
- HsBinds(..), StmtCtxt(..), HsType(..),
- unguardedRHS, mkSimpleMatch, mkMonoBind, andMonoBindList
+ HsBinds(..), HsType(..), HsDoContext(..),
+ unguardedRHS, mkSimpleMatch, mkMonoBind, andMonoBindList, placeHolderType
)
import RdrHsSyn ( mkHsOpApp, RdrNameMonoBinds, RdrNameHsExpr, RdrNamePat )
import RdrName ( RdrName, mkUnqual )
import BasicTypes ( RecFlag(..), Fixity(..), FixityDirection(..)
- , maxPrecedence
+ , maxPrecedence, defaultFixity
, Boxity(..)
)
import FieldLabel ( fieldLabelName )
import TyCon ( TyCon, isNewTyCon, tyConDataCons, isEnumerationTyCon,
maybeTyConSingleCon, tyConFamilySize
)
-import Type ( isUnLiftedType, isUnboxedType, Type )
+import TcType ( isUnLiftedType, tcEqType, Type )
import TysPrim ( charPrimTy, intPrimTy, wordPrimTy, addrPrimTy,
floatPrimTy, doublePrimTy
)
-import Util ( mapAccumL, zipEqual, zipWithEqual,
+import Util ( mapAccumL, zipEqual, zipWithEqual, isSingleton,
zipWith3Equal, nOfThem )
import Panic ( panic, assertPanic )
-import Maybes ( maybeToBool )
+import Maybes ( maybeToBool, orElse )
import Constants
import List ( partition, intersperse )
-import Outputable ( pprPanic, ppr, pprTrace )
#if __GLASGOW_HASKELL__ >= 404
import GlaExts ( fromInt )
(==) (O3 a1 b1 c1) (O3 a2 b2 c2) = a1 == a2 && b1 == b2 && c1 == c2
\end{verbatim}
- Note: if we're comparing unboxed things, e.g., if \tr{a1} and
+ Note: if we're comparing unlifted things, e.g., if \tr{a1} and
\tr{a2} are \tr{Float#}s, then we have to generate
\begin{verbatim}
case (a1 `eqFloat#` a2) of
else -- calc. and compare the tags
[([a_Pat, b_Pat],
untag_Expr tycon [(a_RDR,ah_RDR), (b_RDR,bh_RDR)]
- (cmp_tags_Expr eqH_Int_RDR ah_RDR bh_RDR true_Expr false_Expr))]
+ (genOpApp (HsVar ah_RDR) eqH_Int_RDR (HsVar bh_RDR)))]
in
mk_FunMonoBind tycon_loc eq_RDR ((map pats_etc nonnullary_cons) ++ rest)
`AndMonoBinds`
}
\end{verbatim}
- Again, we must be careful about unboxed comparisons. For example,
+ Again, we must be careful about unlifted comparisons. For example,
if \tr{a1} and \tr{a2} were \tr{Int#}s in the 2nd example above, we'd need to
generate:
(if maybeToBool (maybeTyConSingleCon tycon) then
-- cmp_eq_Expr ltTag_Expr eqTag_Expr gtTag_Expr a_Expr b_Expr
--- Wierd. Was: case (cmp a b) of { LT -> LT; EQ -> EQ; GT -> GT }
+-- Weird. Was: case (cmp a b) of { LT -> LT; EQ -> EQ; GT -> GT }
cmp_eq_Expr a_Expr b_Expr
else
cmp_eq =
mk_FunMonoBind tycon_loc
cmp_eq_RDR
- (if null nonnullary_cons && (length nullary_cons == 1) then
+ (if null nonnullary_cons && isSingleton nullary_cons then
-- catch this specially to avoid warnings
-- about overlapping patterns from the desugarer.
let
else
map pats_etc nonnullary_cons ++
-- leave out wildcards to silence desugarer.
- (if length tycon_data_cons == 1 then
+ (if isSingleton tycon_data_cons then
[]
else
[([WildPatIn, WildPatIn], default_rhs)]))
-- inexhaustive patterns
| otherwise = eqTag_Expr -- Some nullary constructors;
-- Tags are equal, no args => return EQ
- --------------------------------------------------------------------
-
-{- Not necessary: the default decls in PrelBase handle these
-
-defaulted = foldr1 AndMonoBinds [lt, le, ge, gt, max_, min_]
-
-lt = mk_easy_FunMonoBind generatedSrcLoc lt_RDR [a_Pat, b_Pat] [] (
- compare_Case true_Expr false_Expr false_Expr a_Expr b_Expr)
-le = mk_easy_FunMonoBind generatedSrcLoc le_RDR [a_Pat, b_Pat] [] (
- compare_Case true_Expr true_Expr false_Expr a_Expr b_Expr)
-ge = mk_easy_FunMonoBind generatedSrcLoc ge_RDR [a_Pat, b_Pat] [] (
- compare_Case false_Expr true_Expr true_Expr a_Expr b_Expr)
-gt = mk_easy_FunMonoBind generatedSrcLoc gt_RDR [a_Pat, b_Pat] [] (
- compare_Case false_Expr false_Expr true_Expr a_Expr b_Expr)
-
-max_ = mk_easy_FunMonoBind generatedSrcLoc max_RDR [a_Pat, b_Pat] [] (
- compare_Case b_Expr a_Expr a_Expr a_Expr b_Expr)
-min_ = mk_easy_FunMonoBind generatedSrcLoc min_RDR [a_Pat, b_Pat] [] (
- compare_Case a_Expr b_Expr b_Expr a_Expr b_Expr)
--}
\end{code}
%************************************************************************
= if isEnumerationTyCon tycon then
min_bound_enum `AndMonoBinds` max_bound_enum
else
- ASSERT(length data_cons == 1)
+ ASSERT(isSingleton data_cons)
min_bound_1con `AndMonoBinds` max_bound_1con
where
data_cons = tyConDataCons tycon
False
}}}
\end{verbatim}
-(modulo suitable case-ification to handle the unboxed tags)
+(modulo suitable case-ification to handle the unlifted tags)
For a single-constructor type (NB: this includes all tuples), e.g.,
\begin{verbatim}
in
HsCase
(genOpApp (HsVar dh_RDR) minusH_RDR (HsVar ah_RDR))
- [mkSimpleMatch [VarPatIn c_RDR] rhs Nothing tycon_loc]
+ [mkSimpleMatch [VarPatIn c_RDR] rhs placeHolderType tycon_loc]
tycon_loc
))
) {-else-} (
where
stmts = zipWith3Equal "single_con_range" mk_qual as_needed bs_needed cs_needed
++
- [ReturnStmt con_expr]
+ [ResultStmt con_expr tycon_loc]
mk_qual a b c = BindStmt (VarPatIn c)
(HsApp (HsVar range_RDR)
| is_infix = let (h:t) = field_quals in (h:con_qual:t)
| otherwise = con_qual:field_quals
- stmts = quals ++ [ReturnStmt result_expr]
+ stmts = quals ++ [ResultStmt result_expr tycon_loc]
{-
c.f. Figure 18 in Haskell 1.1 report.
getPrecedence get_fixity nm
= case get_fixity nm of
Just (Fixity x _) -> fromInt x
- other -> pprTrace "TcGenDeriv.getPrecedence" (ppr nm) defaultPrecedence
+ other -> defaultPrecedence
isLRAssoc :: (Name -> Maybe Fixity) -> Name -> (Bool, Bool)
isLRAssoc get_fixity nm =
- case get_fixity nm of
- Just (Fixity _ InfixN) -> (False, False)
- Just (Fixity _ InfixR) -> (False, True)
- Just (Fixity _ InfixL) -> (True, False)
- other -> pprPanic "TcGenDeriv.isLRAssoc" (ppr nm)
-
-isInfixOccName :: String -> Bool
-isInfixOccName str =
- case str of
- (':':_) -> True
- _ -> False
+ case get_fixity nm `orElse` defaultFixity of
+ Fixity _ InfixN -> (False, False)
+ Fixity _ InfixR -> (False, True)
+ Fixity _ InfixL -> (True, False)
\end{code}
con2tag_Foo :: Foo ... -> Int#
tag2con_Foo :: Int -> Foo ... -- easier if Int, not Int#
-maxtag_Foo :: Int -- ditto (NB: not unboxed)
+maxtag_Foo :: Int -- ditto (NB: not unlifted)
\end{verbatim}
The `tags' here start at zero, hence the @fIRST_TAG@ (currently one)
loc
mk_match loc pats expr binds
- = Match [] (map paren pats) Nothing
- (GRHSs (unguardedRHS expr loc) binds Nothing)
+ = Match (map paren pats) Nothing
+ (GRHSs (unguardedRHS expr loc) binds placeHolderType)
where
paren p@(VarPatIn _) = p
paren other_p = ParPatIn other_p
ToDo: Better SrcLocs.
\begin{code}
-compare_Case ::
- RdrNameHsExpr -> RdrNameHsExpr -> RdrNameHsExpr
- -> RdrNameHsExpr -> RdrNameHsExpr
- -> RdrNameHsExpr
compare_gen_Case ::
RdrName
-> RdrNameHsExpr -> RdrNameHsExpr -> RdrNameHsExpr
-> RdrNameHsExpr -> RdrNameHsExpr
-> RdrNameHsExpr
-compare_Case = compare_gen_Case compare_RDR
cmp_eq_Expr a b = HsApp (HsApp (HsVar cmp_eq_RDR) a) b
-- Was: compare_gen_Case cmp_eq_RDR
compare_gen_Case fun lt eq gt a b
= HsCase (HsPar (HsApp (HsApp (HsVar fun) a) b)) {-of-}
- [mkSimpleMatch [ConPatIn ltTag_RDR []] lt Nothing generatedSrcLoc,
- mkSimpleMatch [ConPatIn eqTag_RDR []] eq Nothing generatedSrcLoc,
- mkSimpleMatch [ConPatIn gtTag_RDR []] gt Nothing generatedSrcLoc]
+ [mkSimpleMatch [ConPatIn ltTag_RDR []] lt placeHolderType generatedSrcLoc,
+ mkSimpleMatch [ConPatIn eqTag_RDR []] eq placeHolderType generatedSrcLoc,
+ mkSimpleMatch [ConPatIn gtTag_RDR []] gt placeHolderType generatedSrcLoc]
generatedSrcLoc
careful_compare_Case ty lt eq gt a b
- = if not (isUnboxedType ty) then
+ | not (isUnLiftedType ty) =
compare_gen_Case compare_RDR lt eq gt a b
-
- else -- we have to do something special for primitive things...
+ | otherwise =
+ -- we have to do something special for primitive things...
HsIf (genOpApp a relevant_eq_op b)
eq
(HsIf (genOpApp a relevant_lt_op b) lt gt generatedSrcLoc)
= if null res then panic "assoc_ty"
else head res
where
- res = [id | (ty',id) <- tyids, ty == ty']
+ res = [id | (ty',id) <- tyids, ty `tcEqType` ty']
eq_op_tbl =
[(charPrimTy, eqH_Char_RDR)
-----------------------------------------------------------------------
eq_Expr :: Type -> RdrNameHsExpr -> RdrNameHsExpr -> RdrNameHsExpr
-eq_Expr ty a b
- = if not (isUnboxedType ty) then
- genOpApp a eq_RDR b
- else -- we have to do something special for primitive things...
- genOpApp a relevant_eq_op b
- where
- relevant_eq_op = assoc_ty_id eq_op_tbl ty
+eq_Expr ty a b = genOpApp a eq_op b
+ where
+ eq_op
+ | not (isUnLiftedType ty) = eq_RDR
+ | otherwise =
+ -- we have to do something special for primitive things...
+ assoc_ty_id eq_op_tbl ty
+
\end{code}
\begin{code}
untag_Expr tycon [] expr = expr
untag_Expr tycon ((untag_this, put_tag_here) : more) expr
= HsCase (HsPar (HsApp (con2tag_Expr tycon) (HsVar untag_this))) {-of-}
- [mkSimpleMatch [VarPatIn put_tag_here] (untag_Expr tycon more expr) Nothing generatedSrcLoc]
+ [mkSimpleMatch [VarPatIn put_tag_here] (untag_Expr tycon more expr) placeHolderType generatedSrcLoc]
generatedSrcLoc
cmp_tags_Expr :: RdrName -- Comparison op
projects / ghc-hetmet.git / blobdiff