import HsSyn
import RdrHsSyn ( RdrNameIE )
import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual,
- mkRdrUnqual, qualifyRdrName
+ mkRdrUnqual, qualifyRdrName, lookupRdrEnv
)
-import HsTypes ( hsTyVarName, hsTyVarNames, replaceTyVarName )
+import HsTypes ( hsTyVarName, replaceTyVarName )
import HscTypes ( Provenance(..), pprNameProvenance, hasBetterProv,
- ImportReason(..), GlobalRdrEnv, Avails, AvailEnv,
- AvailInfo, GenAvailInfo(..), RdrAvailInfo )
+ ImportReason(..), GlobalRdrEnv, AvailEnv,
+ AvailInfo, Avails, GenAvailInfo(..), RdrAvailInfo )
import RnMonad
import Name ( Name, NamedThing(..),
getSrcLoc,
mkLocalName, mkImportedLocalName, mkGlobalName,
- mkIPName, isLocallyDefined,
- nameOccName, nameModule,
+ mkIPName, nameOccName, nameModule_maybe,
extendNameEnv_C, plusNameEnv_C, nameEnvElts,
setNameModuleAndLoc
)
import NameSet
import OccName ( OccName, occNameUserString, occNameFlavour )
-import Module ( ModuleName, moduleName, mkVanillaModule )
+import Module ( ModuleName, moduleName, mkVanillaModule, mkSysModuleNameFS, moduleNameFS )
import FiniteMap
import Unique ( Unique )
import UniqSupply
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
+import FastString ( FastString )
\end{code}
-
-
%*********************************************************
%* *
\subsection{Making new names}
%*********************************************************
\begin{code}
-implicitImportProvenance = NonLocalDef ImplicitImport False
-
newTopBinder :: Module -> RdrName -> SrcLoc -> RnM d Name
+ -- newTopBinder puts into the cache the binder with the
+ -- module information set correctly. When the decl is later renamed,
+ -- the binding site will thereby get the correct module.
+ -- There maybe occurrences that don't have the correct Module, but
+ -- by the typechecker will propagate the binding definition to all
+ -- the occurrences, so that doesn't matter
+
newTopBinder mod rdr_name loc
= -- First check the cache
traceRn (text "newTopBinder" <+> ppr mod <+> ppr loc) `thenRn_`
+ -- There should never be a qualified name in a binding position (except in instance decls)
+ -- The parser doesn't check this because the same parser parses instance decls
+ (if isQual rdr_name then
+ qualNameErr (text "its declaration") (rdr_name,loc)
+ else
+ returnRn ()
+ ) `thenRn_`
+
getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
let
occ = rdrNameOcc rdr_name
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 rdr_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}
%
Just name -> pushSrcLocRn loc $
addWarnRn (shadowedNameWarn rdr_name)
-bindCoreLocalFVRn :: RdrName -> (Name -> RnMS (a, FreeVars))
- -> RnMS (a, FreeVars)
+bindCoreLocalRn :: RdrName -> (Name -> RnMS a) -> RnMS a
-- A specialised variant when renaming stuff from interface
-- files (of which there is a lot)
-- * one at a time
-- * no checks for shadowing
-- * always imported
-- * deal with free vars
-bindCoreLocalFVRn rdr_name enclosed_scope
+bindCoreLocalRn rdr_name enclosed_scope
= getSrcLocRn `thenRn` \ loc ->
getLocalNameEnv `thenRn` \ name_env ->
getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
let
new_name_env = extendRdrEnv name_env rdr_name name
in
- setLocalNameEnv new_name_env (enclosed_scope name) `thenRn` \ (result, fvs) ->
- returnRn (result, delFromNameSet fvs name)
+ setLocalNameEnv new_name_env (enclosed_scope name)
-bindCoreLocalsFVRn [] thing_inside = thing_inside []
-bindCoreLocalsFVRn (b:bs) thing_inside = bindCoreLocalFVRn b $ \ name' ->
- bindCoreLocalsFVRn bs $ \ names' ->
- thing_inside (name':names')
+bindCoreLocalsRn [] thing_inside = thing_inside []
+bindCoreLocalsRn (b:bs) thing_inside = bindCoreLocalRn b $ \ name' ->
+ bindCoreLocalsRn bs $ \ names' ->
+ thing_inside (name':names')
bindLocalNames names enclosed_scope
= getLocalNameEnv `thenRn` \ name_env ->
returnRn (thing, delListFromNameSet fvs names)
-------------------------------------
-bindUVarRn :: SDoc -> RdrName -> (Name -> RnMS (a, FreeVars)) -> RnMS (a, FreeVars)
-bindUVarRn = bindLocalRn
+bindUVarRn :: RdrName -> (Name -> RnMS a) -> RnMS a
+bindUVarRn = bindCoreLocalRn
-------------------------------------
extendTyVarEnvFVRn :: [Name] -> RnMS (a, FreeVars) -> RnMS (a, FreeVars)
(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 = 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
+-------------------------------------
+groupAvails :: Module -> Avails -> [(ModuleName, Avails)]
+ -- Group by module and sort by occurrence
+ -- This keeps the list in canonical order
+groupAvails this_mod avails
+ = [ (mkSysModuleNameFS fs, sortLt lt avails)
+ | (fs,avails) <- fmToList groupFM
+ ]
+ where
+ groupFM :: FiniteMap FastString Avails
+ -- Deliberatey use the FastString so we
+ -- get a canonical ordering
+ groupFM = foldl add emptyFM avails
+
+ add env avail = addToFM_C combine env mod_fs [avail]
+ where
+ mod_fs = moduleNameFS (moduleName avail_mod)
+ avail_mod = case nameModule_maybe (availName avail) of
+ Just m -> m
+ Nothing -> this_mod
+ combine old _ = avail:old
+
+ a1 `lt` a2 = occ1 < occ2
+ where
+ occ1 = nameOccName (availName a1)
+ occ2 = nameOccName (availName a2)
+
+-------------------------------------
pprAvail :: AvailInfo -> SDoc
pprAvail (AvailTC n ns) = ppr n <> case filter (/= n) ns of
[] -> empty
%************************************************************************
\begin{code}
-type FreeVars = NameSet
-
-plusFV :: FreeVars -> FreeVars -> FreeVars
-addOneFV :: FreeVars -> Name -> FreeVars
-unitFV :: Name -> FreeVars
-emptyFVs :: FreeVars
-plusFVs :: [FreeVars] -> FreeVars
-mkFVs :: [Name] -> FreeVars
-
-isEmptyFVs = isEmptyNameSet
-emptyFVs = emptyNameSet
-plusFVs = unionManyNameSets
-plusFV = unionNameSets
-mkFVs = mkNameSet
-
--- No point in adding implicitly imported names to the free-var set
-addOneFV s n = addOneToNameSet s n
-unitFV n = unitNameSet n
-
-- A useful utility
mapFvRn f xs = mapRn f xs `thenRn` \ stuff ->
let
%************************************************************************
\begin{code}
-warnUnusedModules :: [Module] -> RnM d ()
+warnUnusedModules :: [ModuleName] -> RnM d ()
warnUnusedModules mods
= doptRn Opt_WarnUnusedImports `thenRn` \ warn ->
- if warn then mapRn_ (addWarnRn . unused_mod . moduleName) mods
+ if warn then mapRn_ (addWarnRn . unused_mod) mods
else returnRn ()
where
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 (ppr (moduleName m)))]
+ quotes (ppr m))]
warnUnusedImports :: [(Name,Provenance)] -> RnM d ()
warnUnusedImports names
= doptRn Opt_WarnUnusedImports `thenRn` \ warn ->
- if warn then warnUnusedBinds names else return ()
+ if warn then warnUnusedBinds names else returnRn ()
warnUnusedLocalBinds, warnUnusedMatches :: [Name] -> RnM d ()
warnUnusedLocalBinds names
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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