import Name ( Name, Provenance(..), ExportFlag(..), NamedThing(..),
ImportReason(..), getSrcLoc,
mkLocalName, mkImportedLocalName, mkGlobalName, mkUnboundName,
- mkIPName, isSystemName,
+ mkIPName, isSystemName, isWiredInName,
nameOccName, setNameModule, nameModule,
pprOccName, isLocallyDefined, nameUnique, nameOccName,
occNameUserString,
)
import TysWiredIn ( tupleTyCon, unboxedTupleTyCon, listTyCon )
import Type ( funTyCon )
-import Module ( ModuleName, mkThisModule, moduleName, mkVanillaModule )
+import Module ( ModuleName, mkThisModule, moduleName, mkVanillaModule, pprModuleName )
import TyCon ( TyCon )
import FiniteMap
import Unique ( Unique, Uniquable(..) )
-import UniqFM ( emptyUFM, listToUFM, plusUFM_C )
import UniqSupply
import SrcLoc ( SrcLoc, noSrcLoc )
import Outputable
import Util ( removeDups, equivClasses, thenCmp )
import List ( nub )
-import Maybes ( mapMaybe )
\end{code}
%*********************************************************
\begin{code}
-newImportedGlobalName :: ModuleName -> OccName -> Module -> RnM d Name
-newImportedGlobalName mod_name occ mod
+newLocalTopBinder :: Module -> OccName
+ -> (Name -> ExportFlag) -> SrcLoc
+ -> RnM d Name
+newLocalTopBinder mod occ rec_exp_fn loc
+ = newTopBinder mod occ (\name -> setNameProvenance name (LocalDef loc (rec_exp_fn name)))
+ -- We must set the provenance of the thing in the cache
+ -- correctly, particularly whether or not it is locally defined.
+ --
+ -- Since newLocalTopBinder is used only
+ -- at binding occurrences, we may as well get the provenance
+ -- dead right first time; hence the rec_exp_fn passed in
+
+newImportedBinder :: Module -> RdrName -> RnM d Name
+newImportedBinder mod rdr_name
+ = ASSERT2( isUnqual rdr_name, ppr rdr_name )
+ newTopBinder mod (rdrNameOcc rdr_name) (\name -> name)
+ -- Provenance is already implicitImportProvenance
+
+implicitImportProvenance = NonLocalDef ImplicitImport False
+
+newTopBinder :: Module -> OccName -> (Name -> Name) -> RnM d Name
+newTopBinder mod occ set_prov
+ = -- First check the cache
+ getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
+ let
+ key = (moduleName mod, occ)
+ in
+ case lookupFM cache key of
+
+ -- A hit in the cache!
+ -- Set the Module of the thing, and set its provenance (hack pending
+ -- spj update)
+ --
+ -- It also means that if there are two defns for the same thing
+ -- in a module, then each gets a separate SrcLoc
+ --
+ -- There's a complication for wired-in names. We don't want to
+ -- forget that they are wired in even when compiling that module
+ -- (else we spit out redundant defns into the interface file)
+ -- So for them we just set the provenance
+
+ Just name -> let
+ new_name = set_prov (setNameModule name mod)
+ new_cache = addToFM cache key new_name
+ in
+ setNameSupplyRn (us, inst_ns, new_cache, ipcache) `thenRn_`
+ returnRn new_name
+
+ -- Miss in the cache!
+ -- Build a completely new Name, and put it in the cache
+ Nothing -> let
+ (us', us1) = splitUniqSupply us
+ uniq = uniqFromSupply us1
+ new_name = set_prov (mkGlobalName uniq mod occ implicitImportProvenance)
+ new_cache = addToFM cache key new_name
+ in
+ setNameSupplyRn (us', inst_ns, new_cache, ipcache) `thenRn_`
+ returnRn new_name
+
+
+mkImportedGlobalName :: 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
+ --
+ -- This means that a renamed program may have incorrect info
+ -- on implicitly-imported occurrences, but the correct info on the
+ -- *binding* declaration. It's the type checker that propagates the
+ -- correct information to all the occurrences.
+ -- Since implicitly-imported names never occur in error messages,
+ -- 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) ->
let
key = (mod_name, occ)
where
(us', us1) = splitUniqSupply us
uniq = uniqFromSupply us1
- name = mkGlobalName uniq mod occ (NonLocalDef ImplicitImport False)
+ mod = mkVanillaModule mod_name
+ name = mkGlobalName uniq mod occ implicitImportProvenance
new_cache = addToFM cache key 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
+-- already in the cache. Why not? Consider
+-- module A module M( f )
+-- import M( f ) import N( f)
+-- import N
+-- So f is defined in N, and M re-exports it.
+-- When processing module A:
+-- 1. We read M.hi first, and make a vanilla name N.f
+-- (without reading N.hi). The package info says <THIS>
+-- for lack of anything better.
+-- 2. Now we read N, which update the cache to record
+-- the correct package for N.f.
+-- 3. Finally we update provenances (once we've read all imports).
+-- Step 3 must not destroy package info recorded in Step 2.
+
updateProvenances names
= getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- setNameSupplyRn (us, inst_ns, update cache names, ipcache)
+ setNameSupplyRn (us, inst_ns, foldr update cache names, ipcache)
where
- update cache [] = cache
- update cache (name:names) = WARN( not (key `elemFM` cache), ppr name )
- update (addToFM cache key name) names
- where
- key = (moduleName (nameModule name), nameOccName name)
+ update name cache = addToFM_C update_prov cache key name
+ where
+ key = (moduleName (nameModule name), nameOccName name)
+
+ update_prov name_in_cache name_with_prov
+ = setNameProvenance name_in_cache (getNameProvenance name_with_prov)
+
-newImportedBinder :: Module -> RdrName -> RnM d Name
-newImportedBinder mod rdr_name
- = ASSERT2( isUnqual rdr_name, ppr rdr_name )
- newImportedGlobalName (moduleName mod) (rdrNameOcc rdr_name) mod
--- Make an imported global name, checking first to see if it's in the cache
-mkImportedGlobalName :: ModuleName -> OccName -> RnM d Name
-mkImportedGlobalName mod_name occ
- = newImportedGlobalName mod_name occ (mkVanillaModule mod_name)
-
mkImportedGlobalFromRdrName :: RdrName -> RnM d Name
mkImportedGlobalFromRdrName rdr_name
| isQual rdr_name
mkImportedGlobalName mod_name (rdrNameOcc rdr_name)
-newLocalTopBinder :: Module -> OccName
- -> (Name -> ExportFlag) -> SrcLoc
- -> RnM d Name
-newLocalTopBinder mod occ rec_exp_fn loc
- = -- First check the cache
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- let
- key = (moduleName mod,occ)
- mk_prov name = LocalDef loc (rec_exp_fn name)
- -- We must set the provenance of the thing in the cache
- -- correctly, particularly whether or not it is locally defined.
- --
- -- Since newLocallyDefinedGlobalName is used only
- -- at binding occurrences, we may as well get the provenance
- -- dead right first time; hence the rec_exp_fn passed in
- in
- case lookupFM cache key of
-
- -- A hit in the cache!
- -- Overwrite whatever provenance is in the cache already;
- -- this updates WiredIn things and known-key things,
- -- which are there from the start, to LocalDef.
- --
- -- It also means that if there are two defns for the same thing
- -- in a module, then each gets a separate SrcLoc
- Just name -> let
- new_name = setNameProvenance name (mk_prov new_name)
- new_cache = addToFM cache key new_name
- in
- setNameSupplyRn (us, inst_ns, new_cache, ipcache) `thenRn_`
- returnRn new_name
-
- -- Miss in the cache!
- -- Build a new original name, and put it in the cache
- Nothing -> let
- (us', us1) = splitUniqSupply us
- uniq = uniqFromSupply us1
- new_name = mkGlobalName uniq mod occ (mk_prov new_name)
- new_cache = addToFM cache key new_name
- in
- setNameSupplyRn (us', inst_ns, new_cache, ipcache) `thenRn_`
- returnRn new_name
-
getIPName rdr_name
= getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
case lookupFM ipcache key of
-\subsubsection{ExportAvails}% ================
-
-\begin{code}
-mkEmptyExportAvails :: ModuleName -> ExportAvails
-mkEmptyExportAvails mod_name = (unitFM mod_name [], emptyUFM)
-
-mkExportAvails :: ModuleName -> Bool -> GlobalRdrEnv -> [AvailInfo] -> ExportAvails
-mkExportAvails mod_name unqual_imp name_env avails
- = (mod_avail_env, entity_avail_env)
- where
- mod_avail_env = unitFM mod_name unqual_avails
-
- -- unqual_avails is the Avails that are visible in *unqualfied* form
- -- (1.4 Report, Section 5.1.1)
- -- For example, in
- -- import T hiding( f )
- -- we delete f from avails
-
- unqual_avails | not unqual_imp = [] -- Short cut when no unqualified imports
- | otherwise = mapMaybe prune avails
-
- prune (Avail n) | unqual_in_scope n = Just (Avail n)
- prune (Avail n) | otherwise = Nothing
- prune (AvailTC n ns) | null uqs = Nothing
- | otherwise = Just (AvailTC n uqs)
- where
- uqs = filter unqual_in_scope ns
-
- unqual_in_scope n = unQualInScope name_env n
-
- entity_avail_env = listToUFM [ (name,avail) | avail <- avails,
- name <- availNames avail]
-
-plusExportAvails :: ExportAvails -> ExportAvails -> ExportAvails
-plusExportAvails (m1, e1) (m2, e2)
- = (plusFM_C (++) m1 m2, plusAvailEnv e1 e2)
- -- ToDo: wasteful: we do this once for each constructor!
-\end{code}
-
-
\subsubsection{AvailInfo}% ================
\begin{code}
\begin{code}
-warnUnusedLocalBinds, warnUnusedImports, warnUnusedMatches :: [Name] -> RnM d ()
+warnUnusedModules :: [ModuleName] -> RnM d ()
+warnUnusedModules mods
+ | not opt_WarnUnusedImports = returnRn ()
+ | otherwise = mapRn_ (addWarnRn . unused_mod) mods
+ where
+ unused_mod m = ptext SLIT("Module") <+> quotes (pprModuleName m) <+>
+ text "is imported, but nothing from it is used"
+warnUnusedLocalBinds, warnUnusedImports, warnUnusedMatches :: [Name] -> RnM d ()
warnUnusedImports names
| not opt_WarnUnusedImports
= returnRn () -- Don't force names unless necessary
projects / ghc-hetmet.git / blobdiff