newLocalBndrRn, newLocalBndrsRn, newIPNameRn,
bindLocalName, bindLocalNames, bindLocalNamesFV,
MiniFixityEnv, emptyFsEnv, extendFsEnv, lookupFsEnv,
- bindLocalNamesFV_WithFixities,
+ addLocalFixities,
bindLocatedLocalsFV, bindLocatedLocalsRn,
bindSigTyVarsFV, bindPatSigTyVars, bindPatSigTyVarsFV,
- bindTyVarsRn, extendTyVarEnvFVRn,
+ bindTyVarsRn, bindTyVarsFV, extendTyVarEnvFVRn,
checkDupRdrNames, checkDupAndShadowedRdrNames,
- checkDupAndShadowedNames,
- mapFvRn, mapFvRnCPS,
+ checkDupNames, checkDupAndShadowedNames,
+ addFvRn, mapFvRn, mapMaybeFvRn, mapFvRnCPS,
warnUnusedMatches, warnUnusedModules, warnUnusedImports,
warnUnusedTopBinds, warnUnusedLocalBinds,
dataTcOccs, unknownNameErr, kindSigErr, perhapsForallMsg
nameSrcLoc, nameSrcSpan, nameOccName, nameModule, isExternalName )
import NameSet
import NameEnv
-import LazyUniqFM
+import UniqFM
import DataCon ( dataConFieldLabels )
import OccName
-import Module ( Module, ModuleName )
+import Module ( ModuleName )
import PrelNames ( mkUnboundName, rOOT_MAIN, iNTERACTIVE,
consDataConKey, forall_tv_RDR )
import Unique
%*********************************************************
\begin{code}
-newTopSrcBinder :: Module -> Located RdrName -> RnM Name
-newTopSrcBinder this_mod (L loc rdr_name)
+newTopSrcBinder :: Located RdrName -> RnM Name
+newTopSrcBinder (L loc rdr_name)
| Just name <- isExact_maybe rdr_name
= -- This is here to catch
-- (a) Exact-name binders created by Template Haskell
-- data T = (,) Int Int
-- unless we are in GHC.Tup
ASSERT2( isExternalName name, ppr name )
- do { unless (this_mod == nameModule name)
+ do { this_mod <- getModule
+ ; unless (this_mod == nameModule name)
(addErrAt loc (badOrigBinding rdr_name))
; return name }
| Just (rdr_mod, rdr_occ) <- isOrig_maybe rdr_name
- = do { unless (rdr_mod == this_mod || rdr_mod == rOOT_MAIN)
+ = do { this_mod <- getModule
+ ; unless (rdr_mod == this_mod || rdr_mod == rOOT_MAIN)
(addErrAt loc (badOrigBinding rdr_name))
-- When reading External Core we get Orig names as binders,
-- but they should agree with the module gotten from the monad
; return (mkInternalName uniq (rdrNameOcc rdr_name) loc) }
else
-- Normal case
- newGlobalBinder this_mod (rdrNameOcc rdr_name) loc }
+ do { this_mod <- getModule
+ ; newGlobalBinder this_mod (rdrNameOcc rdr_name) loc } }
\end{code}
%*********************************************************
| otherwise -- Find all the things the rdr-name maps to
= do { -- and pick the one with the right parent name
; env <- getGlobalRdrEnv
- ; let gres = (lookupGlobalRdrEnv env (rdrNameOcc rdr_name))
+ ; let gres = lookupGlobalRdrEnv env (rdrNameOcc rdr_name)
; case pick parent gres of
-- NB: lookupGlobalRdrEnv, not lookupGRE_RdrName!
-- The latter does pickGREs, but we want to allow 'x'
-- even if only 'M.x' is in scope
- [gre] -> do { addUsedRdrName gre rdr_name
+ [gre] -> do { addUsedRdrNames (used_rdr_names gre)
; return (gre_name gre) }
[] -> do { addErr (unknownSubordinateErr doc rdr_name)
; traceRn (text "RnEnv.lookup_sub_bndr" <+> (ppr rdr_name $$ ppr gres))
right_parent p (GRE { gre_par = ParentIs p' }) = p==p'
right_parent _ _ = False
+ -- Note [Usage for sub-bndrs]
+ used_rdr_names gre
+ | isQual rdr_name = [rdr_name]
+ | otherwise = case gre_prov gre of
+ LocalDef -> [rdr_name]
+ Imported is -> map mk_qual_rdr is
+ mk_qual_rdr imp_spec = mkRdrQual (is_as (is_decl imp_spec)) rdr_occ
+ rdr_occ = rdrNameOcc rdr_name
+
newIPNameRn :: IPName RdrName -> TcRnIf m n (IPName Name)
newIPNameRn ip_rdr = newIPName (mapIPName rdrNameOcc ip_rdr)
(gre:_) -> return $ gre_name gre
-- if there is more than one, an error will be raised elsewhere
[] -> lookupOccRn rdr_name
+\end{code}
+Note [Usage for sub-bndrs]
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+If you have this
+ import qualified M( C( f ) )
+ intance M.C T where
+ f x = x
+then is the qualified import M.f used? Obviously yes.
+But the RdrName used in the instance decl is unqualified. In effect,
+we fill in the qualification by looking for f's whose class is M.C
+But when adding to the UsedRdrNames we must make that qualification
+explicit, otherwise we get "Redundant import of M.C".
--------------------------------------------------
-- Occurrences
--------------------------------------------------
+\begin{code}
getLookupOccRn :: RnM (Name -> Maybe Name)
getLookupOccRn
= getLocalRdrEnv `thenM` \ local_env ->
--------------------------------
-- Used for nested fixity decls to bind names along with their fixities.
-- the fixities are given as a UFM from an OccName's FastString to a fixity decl
--- Also check for unused binders
-bindLocalNamesFV_WithFixities :: [Name]
- -> MiniFixityEnv
- -> RnM (a, FreeVars) -> RnM (a, FreeVars)
-bindLocalNamesFV_WithFixities names fixities thing_inside
- = bindLocalNamesFV names $
- extendFixityEnv boundFixities $
- thing_inside
+
+addLocalFixities :: MiniFixityEnv -> [Name] -> RnM a -> RnM a
+addLocalFixities mini_fix_env names thing_inside
+ = extendFixityEnv (mapCatMaybes find_fixity names) thing_inside
where
- -- find the names that have fixity decls
- boundFixities = foldr
- (\ name -> \ acc ->
- -- check whether this name has a fixity decl
- case lookupFsEnv fixities (occNameFS (nameOccName name)) of
- Just (L _ fix) -> (name, FixItem (nameOccName name) fix) : acc
- Nothing -> acc) [] names
- -- bind the names; extend the fixity env; do the thing inside
+ find_fixity name
+ = case lookupFsEnv mini_fix_env (occNameFS occ) of
+ Just (L _ fix) -> Just (name, FixItem occ fix)
+ Nothing -> Nothing
+ where
+ occ = nameOccName name
\end{code}
--------------------------------
bindLocalNamesFV :: [Name] -> RnM (a, FreeVars) -> RnM (a, FreeVars)
bindLocalNamesFV names enclosed_scope
= do { (result, fvs) <- bindLocalNames names enclosed_scope
- ; return (result, delListFromNameSet fvs names) }
+ ; return (result, delFVs names fvs) }
-------------------------------------
bindLocatedLocalsFV rdr_names enclosed_scope
= bindLocatedLocalsRn rdr_names $ \ names ->
enclosed_scope names `thenM` \ (thing, fvs) ->
- return (thing, delListFromNameSet fvs names)
+ return (thing, delFVs names fvs)
-------------------------------------
+bindTyVarsFV :: [LHsTyVarBndr RdrName]
+ -> ([LHsTyVarBndr Name] -> RnM (a, FreeVars))
+ -> RnM (a, FreeVars)
+bindTyVarsFV tyvars thing_inside
+ = bindTyVarsRn tyvars $ \ tyvars' ->
+ do { (res, fvs) <- thing_inside tyvars'
+ ; return (res, delFVs (map hsLTyVarName tyvars') fvs) }
+
bindTyVarsRn :: [LHsTyVarBndr RdrName]
-> ([LHsTyVarBndr Name] -> RnM a)
-> RnM a
\begin{code}
-- A useful utility
+addFvRn :: FreeVars -> RnM (thing, FreeVars) -> RnM (thing, FreeVars)
+addFvRn fvs1 thing_inside = do { (res, fvs2) <- thing_inside
+ ; return (res, fvs1 `plusFV` fvs2) }
+
mapFvRn :: (a -> RnM (b, FreeVars)) -> [a] -> RnM ([b], FreeVars)
mapFvRn f xs = do stuff <- mapM f xs
case unzip stuff of
(ys, fvs_s) -> return (ys, plusFVs fvs_s)
+mapMaybeFvRn :: (a -> RnM (b, FreeVars)) -> Maybe a -> RnM (Maybe b, FreeVars)
+mapMaybeFvRn _ Nothing = return (Nothing, emptyFVs)
+mapMaybeFvRn f (Just x) = do { (y, fvs) <- f x; return (Just y, fvs) }
+
-- because some of the rename functions are CPSed:
-- maps the function across the list from left to right;
-- collects all the free vars into one set
warnUnusedImports, warnUnusedTopBinds :: [GlobalRdrElt] -> RnM ()
warnUnusedImports gres = ifOptM Opt_WarnUnusedImports (warnUnusedGREs gres)
-warnUnusedTopBinds gres = ifOptM Opt_WarnUnusedBinds (warnUnusedGREs gres)
+warnUnusedTopBinds gres
+ = ifOptM Opt_WarnUnusedBinds
+ $ do isBoot <- tcIsHsBoot
+ let noParent gre = case gre_par gre of
+ NoParent -> True
+ ParentIs _ -> False
+ -- Don't warn about unused bindings with parents in
+ -- .hs-boot files, as you are sometimes required to give
+ -- unused bindings (trac #3449).
+ gres' = if isBoot then filter noParent gres
+ else gres
+ warnUnusedGREs gres'
warnUnusedLocalBinds, warnUnusedMatches :: [Name] -> FreeVars -> RnM ()
warnUnusedLocalBinds = check_unused Opt_WarnUnusedBinds
projects / ghc-hetmet.git / blobdiff