= -- First check the cache
traceRn (text "newTopBinder" <+> ppr mod <+> ppr occ) `thenRn_`
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
+ getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
let
- key = (moduleName mod, occ)
+ key = (moduleName mod, occ)
in
case lookupFM cache key of
new_name = setNameModule name mod
new_cache = addToFM cache key new_name
in
- setNameSupplyRn (us, inst_ns, new_cache, ipcache) `thenRn_`
+ setNameSupplyRn (us, new_cache, ipcache) `thenRn_`
traceRn (text "newTopBinder: overwrite" <+> ppr new_name) `thenRn_`
returnRn new_name
new_name = mkGlobalName uniq mod occ implicitImportProvenance
new_cache = addToFM cache key new_name
in
- setNameSupplyRn (us', inst_ns, new_cache, ipcache) `thenRn_`
+ setNameSupplyRn (us', new_cache, ipcache) `thenRn_`
traceRn (text "newTopBinder: new" <+> ppr new_name) `thenRn_`
returnRn new_name
-mkImportedGlobalName :: ModuleName -> OccName -> RnM d Name
+newGlobalName :: ModuleName -> OccName -> RnM d Name
-- Used for *occurrences*. We make a place-holder Name, really just
-- to agree on its unique, which gets overwritten when we read in
-- the binding occurence later (newImportedBinder)
-- The place-holder Name doesn't have the right Provenance, and its
- -- Module won't have the right Package either
+ -- Module won't have the right Package either.
+ --
+ -- (We have to pass a ModuleName, not a Module, because we may be
+ -- simply looking at an occurrence M.x in an interface file.)
--
-- This means that a renamed program may have incorrect info
-- on implicitly-imported occurrences, but the correct info on the
-- it doesn't matter that we get the correct info in place till later,
-- (but since it affects DLL-ery it does matter that we get it right
-- in the end).
-mkImportedGlobalName mod_name occ
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
+newGlobalName mod_name occ
+ = getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
let
key = (mod_name, occ)
in
case lookupFM cache key of
- Just name -> traceRn (text "mkImportedGlobalName: hit" <+> ppr name) `thenRn_`
+ Just name -> traceRn (text "newGlobalName: hit" <+> ppr name) `thenRn_`
returnRn name
- Nothing -> setNameSupplyRn (us', inst_ns, new_cache, ipcache) `thenRn_`
- traceRn (text "mkImportedGlobalName: new" <+> ppr name) `thenRn_`
+
+ Nothing -> setNameSupplyRn (us', new_cache, ipcache) `thenRn_`
+ traceRn (text "newGlobalName: new" <+> ppr name) `thenRn_`
returnRn name
where
(us', us1) = splitUniqSupply us
name = mkGlobalName uniq mod occ implicitImportProvenance
new_cache = addToFM cache key name
+
+newIPName rdr_name
+ = getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+ case lookupFM ipcache key of
+ Just name -> returnRn name
+ Nothing -> setNameSupplyRn (us', cache, new_ipcache) `thenRn_`
+ returnRn name
+ where
+ (us', us1) = splitUniqSupply us
+ uniq = uniqFromSupply us1
+ name = mkIPName uniq key
+ new_ipcache = addToFM ipcache key name
+ where key = (rdrNameOcc rdr_name)
+
updateProvenances :: [Name] -> RnM d ()
-- Update the provenances of everything that is in scope.
-- We must be careful not to disturb the Module package info
-- Step 3 must not destroy package info recorded in Step 2.
updateProvenances names
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- setNameSupplyRn (us, inst_ns, foldr update cache names, ipcache)
+ = getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+ setNameSupplyRn (us, foldr update cache names, ipcache)
where
update name cache = addToFM_C update_prov cache key name
where
update_prov name_in_cache name_with_prov
= setNameProvenance name_in_cache (getNameProvenance name_with_prov)
-
+\end{code}
+
+%*********************************************************
+%* *
+\subsection{Looking up names}
+%* *
+%*********************************************************
+
+Looking up a name in the RnEnv.
+
+\begin{code}
+lookupBndrRn rdr_name
+ = getLocalNameEnv `thenRn` \ local_env ->
+ case lookupRdrEnv local_env rdr_name of
+ Just name -> returnRn name
+ Nothing -> lookupTopBndrRn rdr_name
+
+lookupTopBndrRn rdr_name
+ = getModeRn `thenRn` \ mode ->
+ case mode of
+ InterfaceMode -> -- Look in the global name cache
+ lookupOrigName rdr_name
+
+ SourceMode -> -- Source mode, so look up a *qualified* version
+ -- of the name, so that we get the right one even
+ -- if there are many with the same occ name
+ -- There must *be* a binding
+ 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
+ Nothing -> -- Almost always this case is a compiler bug.
+ -- But consider a type signature that doesn't have
+ -- a corresponding binder:
+ -- module M where { f :: Int->Int }
+ -- We use lookupSigOccRn, which uses lookupBndrRn (for good reasons)
+ -- and we don't want to panic. So we report an out-of-scope error
+ failWithRn (mkUnboundName rdr_name)
+ (unknownNameErr rdr_name)
+
+-- lookupSigOccRn is used for type signatures and pragmas
+-- Is this valid?
+-- module A
+-- import M( f )
+-- f :: Int -> Int
+-- f x = x
+-- It's clear that the 'f' in the signature must refer to A.f
+-- The Haskell98 report does not stipulate this, but it will!
+-- So we must treat the 'f' in the signature in the same way
+-- as the binding occurrence of 'f', using lookupBndrRn
+lookupSigOccRn :: RdrName -> RnMS Name
+lookupSigOccRn = lookupBndrRn
+
+-- lookupOccRn looks up an occurrence of a RdrName
+lookupOccRn :: RdrName -> RnMS Name
+lookupOccRn rdr_name
+ = getLocalNameEnv `thenRn` \ local_env ->
+ case lookupRdrEnv local_env rdr_name of
+ Just name -> returnRn name
+ Nothing -> lookupGlobalOccRn rdr_name
+
+-- lookupGlobalOccRn is like lookupOccRn, except that it looks in the global
+-- environment. It's used only for
+-- record field names
+-- class op names in class and instance decls
+lookupGlobalOccRn rdr_name
+ = getModeRn `thenRn` \ mode ->
+ case mode of {
+ -- When processing interface files, the global env
+ -- is always empty, so go straight to the name cache
+ InterfaceMode -> lookupOrigName rdr_name ;
+
+ SourceMode ->
+
+ getGlobalNameEnv `thenRn` \ global_env ->
+ case lookupRdrEnv global_env rdr_name of
+ Just [name] -> 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)
+ }
+\end{code}
+%
+
+@lookupOrigName@ takes an RdrName representing an {\em original}
+name, and adds it to the occurrence pool so that it'll be loaded
+later. This is used when language constructs (such as monad
+comprehensions, overloaded literals, or deriving clauses) require some
+stuff to be loaded that isn't explicitly mentioned in the code.
+
+This doesn't apply in interface mode, where everything is explicit,
+but we don't check for this case: it does no harm to record an
+``extra'' occurrence and @lookupOrigNames@ isn't used much in
+interface mode (it's only the @Nothing@ clause of @rnDerivs@ that
+calls it at all I think).
-mkImportedGlobalFromRdrName :: RdrName -> RnM d Name
-mkImportedGlobalFromRdrName rdr_name
+ \fbox{{\em Jan 98: this comment is wrong: @rnHsType@ uses it quite a bit.}}
+
+For List and Tuple types it's important to get the correct
+@isLocallyDefined@ flag, which is used in turn when deciding
+whether there are any instance decls in this module are ``special''.
+The name cache should have the correct provenance, though.
+
+\begin{code}
+lookupOrigName :: RdrName -> RnM d Name
+lookupOrigName rdr_name
| isQual rdr_name
- = mkImportedGlobalName (rdrNameModule rdr_name) (rdrNameOcc rdr_name)
+ = newGlobalName (rdrNameModule rdr_name) (rdrNameOcc rdr_name)
| otherwise
= -- An Unqual is allowed; interface files contain
-- unqualified names for locally-defined things, such as
-- constructors of a data type.
- getModuleRn `thenRn ` \ mod_name ->
- mkImportedGlobalName mod_name (rdrNameOcc rdr_name)
-
+ getModuleRn `thenRn ` \ mod ->
+ newGlobalName (moduleName mod) (rdrNameOcc rdr_name)
-getIPName rdr_name
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- case lookupFM ipcache key of
- Just name -> returnRn name
- Nothing -> setNameSupplyRn (us', inst_ns, cache, new_ipcache) `thenRn_`
- returnRn name
- where
- (us', us1) = splitUniqSupply us
- uniq = uniqFromSupply us1
- name = mkIPName uniq key
- new_ipcache = addToFM ipcache key name
- where key = (rdrNameOcc rdr_name)
+lookupOrigNames :: [RdrName] -> RnM d NameSet
+lookupOrigNames rdr_names
+ = mapRn lookupOrigName rdr_names `thenRn` \ names ->
+ returnRn (mkNameSet names)
\end{code}
-%*********************************************************
-%* *
-\subsection{Dfuns and default methods}
-%* *
-%*********************************************************
-
-@newImplicitBinder@ is used for
- (a) dfuns (RnSource.rnDecl on InstDecls)
- (b) default methods (RnSource.rnDecl on ClassDecls)
-when these dfuns/default methods are defined in the module being compiled
+lookupSysBinder is used for the "system binders" of a type, class, or instance decl.
+It ensures that the module is set correctly in the name cache, and sets the provenance
+on the returned name too. The returned name will end up actually in the type, class,
+or instance.
\begin{code}
-newImplicitBinder occ src_loc
- = getModuleRn `thenRn` \ mod_name ->
- newTopBinder (mkThisModule mod_name) occ `thenRn` \ name ->
- returnRn (setNameProvenance name (LocalDef src_loc Exported))
+lookupSysBinder rdr_name
+ = ASSERT( isUnqual rdr_name )
+ getModuleRn `thenRn` \ mod ->
+ newTopBinder mod (rdrNameOcc rdr_name) `thenRn` \ name ->
+ getModeRn `thenRn` \ mode ->
+ case mode of
+ SourceMode -> getSrcLocRn `thenRn` \ loc ->
+ returnRn (setNameProvenance name (LocalDef loc Exported))
+ InterfaceMode -> returnRn name
\end{code}
-Make a name for the dict fun for an instance decl
+@unQualInScope@ returns a function that takes a @Name@ and tells whether
+its unqualified name is in scope. This is put as a boolean flag in
+the @Name@'s provenance to guide whether or not to print the name qualified
+in error messages.
\begin{code}
-newDFunName :: (OccName, OccName) -> SrcLoc -> RnMS Name
-newDFunName key@(cl_occ, tycon_occ) loc
- = newInstUniq string `thenRn` \ inst_uniq ->
- newImplicitBinder (mkDFunOcc string inst_uniq) loc
+unQualInScope :: GlobalRdrEnv -> Name -> Bool
+unQualInScope env
+ = lookup
where
- -- Any string that is somewhat unique will do
- string = occNameString cl_occ ++ occNameString tycon_occ
-\end{code}
-
-\begin{code}
-getDFunKey :: RenamedHsType -> (OccName, OccName) -- Used to manufacture DFun names
-getDFunKey (HsForAllTy _ _ ty) = getDFunKey ty
-getDFunKey (HsFunTy _ ty) = getDFunKey ty
-getDFunKey (HsPredTy (HsPClass cls (ty:_))) = (nameOccName cls, get_tycon_key ty)
-
-get_tycon_key (HsTyVar tv) = getOccName tv
-get_tycon_key (HsAppTy ty _) = get_tycon_key ty
-get_tycon_key (HsTupleTy (HsTupCon n _) tys) = getOccName n
-get_tycon_key (HsListTy _) = getOccName listTyCon
-get_tycon_key (HsFunTy _ _) = getOccName funTyCon
+ lookup name = case lookupRdrEnv env (mkRdrUnqual (nameOccName name)) of
+ Just [name'] -> name == name'
+ other -> False
\end{code}
%*********************************************************
\begin{code}
--------------------------------------
bindLocatedLocalsRn :: SDoc -- Documentation string for error message
-> [(RdrName,SrcLoc)]
-> ([Name] -> RnMS a)
other -> returnRn ()
) `thenRn_`
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
+ getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
let
n = length rdr_names_w_loc
(us', us1) = splitUniqSupply us
-- Keep track of whether the name originally came from
-- an interface file.
in
- setNameSupplyRn (us', inst_ns, cache, ipcache) `thenRn_`
+ setNameSupplyRn (us', cache, ipcache) `thenRn_`
let
new_name_env = addListToRdrEnv name_env (map fst rdr_names_w_loc `zip` names)
bindCoreLocalFVRn rdr_name enclosed_scope
= getSrcLocRn `thenRn` \ loc ->
getLocalNameEnv `thenRn` \ name_env ->
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
+ getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
let
(us', us1) = splitUniqSupply us
uniq = uniqFromSupply us1
name = mkImportedLocalName uniq (rdrNameOcc rdr_name) loc
in
- setNameSupplyRn (us', inst_ns, cache, ipcache) `thenRn_`
+ setNameSupplyRn (us', cache, ipcache) `thenRn_`
let
new_name_env = extendRdrEnv name_env rdr_name name
in
\end{code}
-%*********************************************************
-%* *
-\subsection{Looking up names}
-%* *
-%*********************************************************
-
-Looking up a name in the RnEnv.
-
-\begin{code}
-lookupBndrRn rdr_name
- = traceRn (text "lookupBndrRn" <+> ppr rdr_name) `thenRn_`
- getNameEnvs `thenRn` \ (global_env, local_env) ->
-
- -- Try local env
- case lookupRdrEnv local_env rdr_name of {
- Just name -> returnRn name ;
- Nothing ->
-
- getModeRn `thenRn` \ mode ->
- case mode of
- InterfaceMode -> -- Look in the global name cache
- mkImportedGlobalFromRdrName rdr_name `thenRn` \ n ->
- traceRn (text "lookupBndrRn result:" <+> ppr n) `thenRn_`
- returnRn n
-
- SourceMode -> -- Source mode, so look up a *qualified* version
- -- of the name, so that we get the right one even
- -- if there are many with the same occ name
- -- There must *be* a binding
- getModuleRn `thenRn` \ mod ->
- case lookupRdrEnv global_env (qualifyRdrName mod rdr_name) of
- 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:
- -- module M where { f :: Int->Int }
- -- We use lookupSigOccRn, which uses lookupBndrRn (for good reasons)
- -- and we don't want to panic. So we report an out-of-scope error
- failWithRn (mkUnboundName rdr_name)
- (unknownNameErr rdr_name)
- }
-
--- lookupOccRn looks up an occurrence of a RdrName
-lookupOccRn :: RdrName -> RnMS Name
-lookupOccRn rdr_name
- = getNameEnvs `thenRn` \ (global_env, local_env) ->
- lookup_occ global_env local_env rdr_name
-
--- lookupGlobalOccRn is like lookupOccRn, except that it looks in the global
--- environment. It's used only for
--- record field names
--- class op names in class and instance decls
-lookupGlobalOccRn :: RdrName -> RnMS Name
-lookupGlobalOccRn rdr_name
- = getNameEnvs `thenRn` \ (global_env, local_env) ->
- lookup_global_occ global_env rdr_name
-
--- lookupSigOccRn is used for type signatures and pragmas
--- Is this valid?
--- module A
--- import M( f )
--- f :: Int -> Int
--- f x = x
--- It's clear that the 'f' in the signature must refer to A.f
--- The Haskell98 report does not stipulate this, but it will!
--- So we must treat the 'f' in the signature in the same way
--- as the binding occurrence of 'f', using lookupBndrRn
-lookupSigOccRn :: RdrName -> RnMS Name
-lookupSigOccRn = lookupBndrRn
-
-
--- Look in both local and global env
-lookup_occ global_env local_env rdr_name
- = case lookupRdrEnv local_env rdr_name of
- Just name -> returnRn name
- Nothing -> lookup_global_occ global_env rdr_name
-
--- Look in global env only
-lookup_global_occ global_env rdr_name
- = case lookupRdrEnv global_env rdr_name of
- Just [name] -> returnRn name
- Just stuff@(name:_) -> addNameClashErrRn rdr_name stuff `thenRn_`
- returnRn name
- Nothing -> getModeRn `thenRn` \ mode ->
- case mode of
- -- Not found when processing source code; so fail
- SourceMode -> failWithRn (mkUnboundName rdr_name)
- (unknownNameErr rdr_name)
-
- -- Not found when processing an imported declaration,
- -- so we create a new name for the purpose
- InterfaceMode -> mkImportedGlobalFromRdrName rdr_name
-\end{code}
-%
-@lookupImplicitOccRn@ takes an RdrName representing an {\em original} name,
-and adds it to the occurrence pool so that it'll be loaded later.
-This is used when language constructs
-(such as monad comprehensions, overloaded literals, or deriving clauses)
-require some stuff to be loaded that isn't explicitly mentioned in the code.
-
-This doesn't apply in interface mode, where everything is explicit,
-but we don't check for this case:
-it does no harm to record an ``extra'' occurrence
-and @lookupImplicitOccRn@ isn't used much in interface mode
-(it's only the @Nothing@ clause of @rnDerivs@ that calls it at all I think).
-
- \fbox{{\em Jan 98: this comment is wrong: @rnHsType@ uses it quite a bit.}}
-
-For List and Tuple types it's important to get the correct
-@isLocallyDefined@ flag, which is used in turn when deciding
-whether there are any instance decls in this module are ``special''.
-The name cache should have the correct provenance, though.
-
-\begin{code}
-lookupImplicitOccRn :: RdrName -> RnM d Name
-lookupImplicitOccRn rdr_name = mkImportedGlobalFromRdrName rdr_name
-
-lookupImplicitOccsRn :: [RdrName] -> RnM d NameSet
-lookupImplicitOccsRn rdr_names
- = mapRn lookupImplicitOccRn rdr_names `thenRn` \ names ->
- returnRn (mkNameSet names)
-\end{code}
-
-@unQualInScope@ returns a function that takes a @Name@ and tells whether
-its unqualified name is in scope. This is put as a boolean flag in
-the @Name@'s provenance to guide whether or not to print the name qualified
-in error messages.
-
-\begin{code}
-unQualInScope :: GlobalRdrEnv -> Name -> Bool
-unQualInScope env
- = lookup
- where
- lookup name = case lookupRdrEnv env (mkRdrUnqual (nameOccName name)) of
- Just [name'] -> name == name'
- other -> False
-\end{code}
-
%************************************************************************
%* *
\subsection{Envt utility functions}
is_duplicate n1 n2 | isLocallyDefined n1 && isLocallyDefined n2 = False
| otherwise = n1 == n2
\end{code}
+
We treat two bindings of a locally-defined name as a duplicate,
because they might be two separate, local defns and we want to report
and error for that, {\em not} eliminate a duplicate.
\begin{code}
-warnUnusedModules :: [ModuleName] -> RnM d ()
+warnUnusedModules :: [Module] -> RnM d ()
warnUnusedModules mods
| not opt_WarnUnusedImports = returnRn ()
- | otherwise = mapRn_ (addWarnRn . unused_mod) mods
+ | otherwise = mapRn_ (addWarnRn . unused_mod . moduleName) mods
where
unused_mod m = vcat [ptext SLIT("Module") <+> quotes (pprModuleName m) <+>
text "is imported, but nothing from it is used",
projects / ghc-hetmet.git / blobdiff