#include "HsVersions.h"
-import CmdLineOpts ( opt_WarnNameShadowing, opt_WarnUnusedMatches,
- opt_WarnUnusedBinds, opt_WarnUnusedImports )
import HsSyn
import RdrHsSyn ( RdrNameIE )
import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual,
- mkRdrUnqual, qualifyRdrName
+ mkRdrUnqual, qualifyRdrName, lookupRdrEnv
)
-import HsTypes ( hsTyVarName, hsTyVarNames, replaceTyVarName )
-import HscTypes ( pprNameProvenance )
+import HsTypes ( hsTyVarName, replaceTyVarName )
+import HscTypes ( Provenance(..), pprNameProvenance, hasBetterProv,
+ ImportReason(..), GlobalRdrEnv, AvailEnv,
+ AvailInfo, Avails, GenAvailInfo(..), RdrAvailInfo )
import RnMonad
-import Name ( Name, Provenance(..), ExportFlag(..), NamedThing(..),
- ImportReason(..), getSrcLoc,
- mkLocalName, mkImportedLocalName, mkGlobalName, mkUnboundName,
- mkIPName, hasBetterProv, isLocallyDefined,
- nameOccName, setNameModule, nameModule,
- extendNameEnv_C, plusNameEnv_C, nameEnvElts
+import Name ( Name, NamedThing(..),
+ getSrcLoc,
+ mkLocalName, mkImportedLocalName, mkGlobalName,
+ mkIPName, nameOccName, nameModule,
+ extendNameEnv_C, plusNameEnv_C, nameEnvElts,
+ setNameModuleAndLoc
)
import NameSet
import OccName ( OccName, occNameUserString, occNameFlavour )
-import Module ( ModuleName, moduleName, mkVanillaModule, pprModuleName )
+import Module ( ModuleName, moduleName, mkVanillaModule )
import FiniteMap
import Unique ( Unique )
import UniqSupply
-import SrcLoc ( SrcLoc )
+import SrcLoc ( SrcLoc, noSrcLoc )
import Outputable
import ListSetOps ( removeDups, equivClasses )
-import Util ( thenCmp, sortLt )
+import Util ( sortLt )
import List ( nub )
+import PrelNames ( mkUnboundName )
+import CmdLineOpts
\end{code}
-
-
%*********************************************************
%* *
\subsection{Making new names}
%*********************************************************
\begin{code}
-implicitImportProvenance = NonLocalDef ImplicitImport False
-
newTopBinder :: Module -> RdrName -> SrcLoc -> RnM d Name
newTopBinder mod rdr_name loc
= -- First check the cache
- traceRn (text "newTopBinder" <+> ppr mod <+> ppr occ) `thenRn_`
+ traceRn (text "newTopBinder" <+> ppr mod <+> ppr loc) `thenRn_`
getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
let
getModuleRn `thenRn` \ mod ->
getGlobalNameEnv `thenRn` \ global_env ->
case lookupRdrEnv global_env (qualifyRdrName (moduleName mod) rdr_name) of
- Just (name:rest) -> ASSERT( null rest )
- returnRn name
+ Just ((name,_):rest) -> ASSERT( null rest )
+ returnRn name
Nothing -> -- Almost always this case is a compiler bug.
-- But consider a type signature that doesn't have
-- a corresponding binder:
getGlobalNameEnv `thenRn` \ global_env ->
case lookupRdrEnv global_env rdr_name of
Just [(name,_)] -> returnRn name
- Just stuff@(_:_) -> addNameClashErrRn rdr_name stuff `thenRn_`
- returnRn name
+ Just stuff@((name,_):_)
+ -> addNameClashErrRn rdr_name stuff `thenRn_`
+ returnRn name
Nothing -> -- Not found when processing source code; so fail
failWithRn (mkUnboundName rdr_name)
(unknownNameErr rdr_name)
}
+
+lookupGlobalRn :: GlobalRdrEnv -> RdrName -> RnM d (Maybe Name)
+ -- Checks that there is exactly one
+lookupGlobalRn global_env rdr_name
+ = case lookupRdrEnv global_env rdr_name of
+ Just [(name,_)] -> returnRn (Just name)
+ Just stuff@((name,_):_) -> addNameClashErrRn rdr_name stuff `thenRn_`
+ returnRn (Just name)
+ Nothing -> returnRn Nothing
\end{code}
%
-- Check for duplicate names
checkDupOrQualNames doc_str rdr_names_w_loc `thenRn_`
+ doptRn Opt_WarnNameShadowing `thenRn` \ warn_shadow ->
+
-- Warn about shadowing, but only in source modules
(case mode of
- SourceMode | opt_WarnNameShadowing -> mapRn_ (check_shadow name_env) rdr_names_w_loc
+ SourceMode | warn_shadow -> mapRn_ (check_shadow name_env) rdr_names_w_loc
other -> returnRn ()
) `thenRn_`
(n,pn) `beats` (m,pm) = n==m && pn `hasBetterProv` pm
- is_duplicate :: Provenance -> (Name,Provenance) -> Bool
- is_duplicate (n1,LocalDef _) (n2,LocalDef _) = False
- is_duplicate _ _ = n1 == n2
+ is_duplicate :: (Name,Provenance) -> (Name,Provenance) -> Bool
+ is_duplicate (n1,LocalDef) (n2,LocalDef) = False
+ is_duplicate (n1,_) (n2,_) = n1 == n2
\end{code}
We treat two bindings of a locally-defined name as a duplicate,
availNames (Avail n) = [n]
availNames (AvailTC n ns) = ns
+-------------------------------------
addSysAvails :: AvailInfo -> [Name] -> AvailInfo
addSysAvails avail [] = avail
addSysAvails (AvailTC n ns) sys = AvailTC n (sys ++ ns)
+-------------------------------------
rdrAvailInfo :: AvailInfo -> RdrAvailInfo
-- Used when building the avails we are going to put in an interface file
-- We sort the components to reduce needless wobbling of interfaces
rdrAvailInfo (Avail n) = Avail (nameOccName n)
rdrAvailInfo (AvailTC n ns) = AvailTC (nameOccName n) (sortLt (<) (map nameOccName ns))
+-------------------------------------
filterAvail :: RdrNameIE -- Wanted
-> AvailInfo -- Available
-> Maybe AvailInfo -- Resulting available;
filterAvail ie avail = Nothing
+-------------------------------------
+sortAvails :: Avails -> Avails
+sortAvails avails = sortLt lt avails
+ where
+ a1 `lt` a2 = mod1 < mod2 ||
+ (mod1 == mod2 && occ1 < occ2)
+ where
+ name1 = availName a1
+ name2 = availName a2
+ mod1 = nameModule name1
+ mod2 = nameModule name2
+ occ1 = nameOccName name1
+ occ2 = nameOccName name2
+
+-------------------------------------
pprAvail :: AvailInfo -> SDoc
pprAvail (AvailTC n ns) = ppr n <> case filter (/= n) ns of
[] -> empty
%************************************************************************
\begin{code}
-warnUnusedModules :: [Module] -> RnM d ()
+warnUnusedModules :: [ModuleName] -> RnM d ()
warnUnusedModules mods
- | not opt_WarnUnusedImports = returnRn ()
- | otherwise = mapRn_ (addWarnRn . unused_mod . moduleName) mods
+ = doptRn Opt_WarnUnusedImports `thenRn` \ warn ->
+ if warn then mapRn_ (addWarnRn . unused_mod) mods
+ else returnRn ()
where
- unused_mod m = vcat [ptext SLIT("Module") <+> quotes (pprModuleName m) <+>
+ unused_mod m = vcat [ptext SLIT("Module") <+> quotes (ppr m) <+>
text "is imported, but nothing from it is used",
parens (ptext SLIT("except perhaps to re-export instances visible in") <+>
- quotes (pprModuleName m))]
+ quotes (ppr m))]
warnUnusedImports :: [(Name,Provenance)] -> RnM d ()
warnUnusedImports names
- | not opt_WarnUnusedImports
- = returnRn () -- Don't force names unless necessary
- | otherwise
- = warnUnusedBinds names
+ = doptRn Opt_WarnUnusedImports `thenRn` \ warn ->
+ if warn then warnUnusedBinds names else returnRn ()
warnUnusedLocalBinds, warnUnusedMatches :: [Name] -> RnM d ()
-warnUnusedLocalBinds ns
- | not opt_WarnUnusedBinds = returnRn ()
- | otherwise = warnUnusedBinds [(n,LocalDef) | n<-ns]
+warnUnusedLocalBinds names
+ = doptRn Opt_WarnUnusedBinds `thenRn` \ warn ->
+ if warn then warnUnusedBinds [(n,LocalDef) | n<-names]
+ else returnRn ()
warnUnusedMatches names
- | opt_WarnUnusedMatches = warnUnusedGroup [(n,LocalDef) | n<-ns]
- | otherwise = returnRn ()
+ = doptRn Opt_WarnUnusedMatches `thenRn` \ warn ->
+ if warn then warnUnusedGroup [(n,LocalDef) | n<-names]
+ else returnRn ()
-------------------------
where
-- Group by provenance
groups = equivClasses cmp names
- (_,prov1) `cmp` (_,prov2) = prov1 `cmp_prov` prov2
+ (_,prov1) `cmp` (_,prov2) = prov1 `compare` prov2
- cmp_prov (LocalDef _ _) (NonLocalDef _ _) = LT
- cmp_prov (LocalDef loc1 _) (LocalDef loc2 _) = loc1 `compare` loc2
- cmp_prov (NonLocalDef (UserImport m1 loc1 _) _)
- (NonLocalDef (UserImport m2 loc2 _) _) =
- (m1 `compare` m2) `thenCmp` (loc1 `compare` loc2)
- cmp_prov (NonLocalDef _ _) (LocalDef _ _) = GT
- -- In-scope NonLocalDefs must have UserImport info on them
-------------------------
| otherwise
= pushSrcLocRn def_loc $
addWarnRn $
- sep [msg <> colon, nest 4 (fsep (punctuate comma (map ppr filtered_names)))]
+ sep [msg <> colon, nest 4 (fsep (punctuate comma (map (ppr.fst) filtered_names)))]
where
filtered_names = filter reportable names
(name1, prov1) = head filtered_names
(is_local, def_loc, msg)
= case prov1 of
- LocalDef loc _ -> (True, loc, text "Defined but not used")
+ LocalDef -> (True, getSrcLoc name1, text "Defined but not used")
NonLocalDef (UserImport mod loc _) _
-> (True, loc, text "Imported from" <+> quotes (ppr mod) <+> text "but not used")
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