import HsSyn
import RdrHsSyn ( RdrNameIE )
-import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual,
- mkRdrUnqual, qualifyRdrName, lookupRdrEnv
+import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual, isOrig,
+ mkRdrUnqual, mkRdrQual, qualifyRdrName, lookupRdrEnv, foldRdrEnv
)
import HsTypes ( hsTyVarName, replaceTyVarName )
import HscTypes ( Provenance(..), pprNameProvenance, hasBetterProv,
ImportReason(..), GlobalRdrEnv, AvailEnv,
- AvailInfo, Avails, GenAvailInfo(..), RdrAvailInfo )
+ AvailInfo, Avails, GenAvailInfo(..), NameSupply(..) )
import RnMonad
-import Name ( Name, NamedThing(..),
+import Name ( Name,
getSrcLoc,
- mkLocalName, mkImportedLocalName, mkGlobalName,
+ mkLocalName, mkGlobalName,
mkIPName, nameOccName, nameModule_maybe,
setNameModuleAndLoc
)
import OccName ( OccName, occNameUserString, occNameFlavour )
import Module ( ModuleName, moduleName, mkVanillaModule, mkSysModuleNameFS, moduleNameFS )
import FiniteMap
-import Unique ( Unique )
import UniqSupply
import SrcLoc ( SrcLoc, noSrcLoc )
import Outputable
newTopBinder mod rdr_name loc
= -- First check the cache
- traceRn (text "newTopBinder" <+> ppr mod <+> ppr loc) `thenRn_`
+ -- 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
returnRn ()
) `thenRn_`
- getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+ getNameSupplyRn `thenRn` \ name_supply ->
let
occ = rdrNameOcc rdr_name
key = (moduleName mod, occ)
+ cache = nsNames name_supply
in
case lookupFM cache key of
new_name = setNameModuleAndLoc name mod loc
new_cache = addToFM cache key new_name
in
- setNameSupplyRn (us, new_cache, ipcache) `thenRn_`
+ setNameSupplyRn (name_supply {nsNames = new_cache}) `thenRn_`
traceRn (text "newTopBinder: overwrite" <+> ppr new_name) `thenRn_`
returnRn new_name
-- Even for locally-defined names we use implicitImportProvenance;
-- updateProvenances will set it to rights
Nothing -> let
- (us', us1) = splitUniqSupply us
+ (us', us1) = splitUniqSupply (nsUniqs name_supply)
uniq = uniqFromSupply us1
new_name = mkGlobalName uniq mod occ loc
new_cache = addToFM cache key new_name
in
- setNameSupplyRn (us', new_cache, ipcache) `thenRn_`
+ setNameSupplyRn (name_supply {nsUniqs = us', nsNames = new_cache}) `thenRn_`
traceRn (text "newTopBinder: new" <+> ppr new_name) `thenRn_`
returnRn new_name
-- (but since it affects DLL-ery it does matter that we get it right
-- in the end).
newGlobalName mod_name occ
- = getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+ = getNameSupplyRn `thenRn` \ name_supply ->
let
key = (mod_name, occ)
+ cache = nsNames name_supply
in
case lookupFM cache key of
- Just name -> traceRn (text "newGlobalName: hit" <+> ppr name) `thenRn_`
+ Just name -> -- traceRn (text "newGlobalName: hit" <+> ppr name) `thenRn_`
returnRn name
- Nothing -> setNameSupplyRn (us', new_cache, ipcache) `thenRn_`
- traceRn (text "newGlobalName: new" <+> ppr name) `thenRn_`
+ Nothing -> setNameSupplyRn (name_supply {nsUniqs = us', nsNames = new_cache}) `thenRn_`
+ -- traceRn (text "newGlobalName: new" <+> ppr name) `thenRn_`
returnRn name
where
- (us', us1) = splitUniqSupply us
+ (us', us1) = splitUniqSupply (nsUniqs name_supply)
uniq = uniqFromSupply us1
mod = mkVanillaModule mod_name
name = mkGlobalName uniq mod occ noSrcLoc
new_cache = addToFM cache key name
newIPName rdr_name
- = getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+ = getNameSupplyRn `thenRn` \ name_supply ->
+ let
+ ipcache = nsIPs name_supply
+ in
case lookupFM ipcache key of
Just name -> returnRn name
- Nothing -> setNameSupplyRn (us', cache, new_ipcache) `thenRn_`
+ Nothing -> setNameSupplyRn (name_supply {nsUniqs = us', nsIPs = new_ipcache}) `thenRn_`
returnRn name
where
- (us', us1) = splitUniqSupply us
+ (us', us1) = splitUniqSupply (nsUniqs name_supply)
uniq = uniqFromSupply us1
name = mkIPName uniq key
new_ipcache = addToFM ipcache key 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
+ if isInterfaceMode mode
+ then lookupIfaceName rdr_name
+ else -- 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)
+ lookupSrcName global_env (qualifyRdrName (moduleName mod) rdr_name)
-- lookupSigOccRn is used for type signatures and pragmas
-- Is this valid?
-- 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 ->
+lookupGlobalOccRn rdr_name
+ = getModeRn `thenRn` \ mode ->
+ if (isInterfaceMode mode)
+ then lookupIfaceName rdr_name
+ else
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)
- }
-
-lookupGlobalRn :: GlobalRdrEnv -> RdrName -> RnM d (Maybe Name)
- -- Checks that there is exactly one
-lookupGlobalRn global_env rdr_name
+ case mode of
+ SourceMode -> lookupSrcName global_env rdr_name
+
+ CmdLineMode
+ | not (isQual rdr_name) ->
+ lookupSrcName global_env rdr_name
+
+ -- We allow qualified names on the command line to refer to
+ -- *any* name exported by any module in scope, just as if
+ -- there was an "import qualified M" declaration for every
+ -- module.
+ --
+ -- First look up the name in the normal environment. If
+ -- it isn't there, we manufacture a new occurrence of an
+ -- original name.
+ | otherwise ->
+ case lookupRdrEnv global_env rdr_name of
+ Just _ -> lookupSrcName global_env rdr_name
+ Nothing -> newGlobalName (rdrNameModule rdr_name)
+ (rdrNameOcc rdr_name)
+
+
+lookupSrcName :: GlobalRdrEnv -> RdrName -> RnM d Name
+-- NB: passed GlobalEnv explicitly, not necessarily in RnMS monad
+lookupSrcName global_env rdr_name
+ | isOrig rdr_name -- Can occur in source code too
+ = lookupOrigName rdr_name
+
+ | otherwise
= case lookupRdrEnv global_env rdr_name of
- Just [(name,_)] -> returnRn (Just name)
+ Just [(name,_)] -> returnRn name
Just stuff@((name,_):_) -> addNameClashErrRn rdr_name stuff `thenRn_`
- returnRn (Just name)
- Nothing -> returnRn Nothing
+ returnRn name
+ Nothing -> failWithRn (mkUnboundName rdr_name)
+ (unknownNameErr rdr_name)
+
+lookupOrigName :: RdrName -> RnM d Name
+lookupOrigName rdr_name
+ = ASSERT( isOrig rdr_name )
+ newGlobalName (rdrNameModule rdr_name) (rdrNameOcc rdr_name)
+
+lookupIfaceUnqual :: RdrName -> RnM d Name
+lookupIfaceUnqual rdr_name
+ = ASSERT( isUnqual rdr_name )
+ -- An Unqual is allowed; interface files contain
+ -- unqualified names for locally-defined things, such as
+ -- constructors of a data type.
+ getModuleRn `thenRn ` \ mod ->
+ newGlobalName (moduleName mod) (rdrNameOcc rdr_name)
+
+lookupIfaceName :: RdrName -> RnM d Name
+lookupIfaceName rdr_name
+ | isUnqual rdr_name = lookupIfaceUnqual rdr_name
+ | otherwise = lookupOrigName 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
\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
- = 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 ->
- newGlobalName (moduleName mod) (rdrNameOcc rdr_name)
-
lookupOrigNames :: [RdrName] -> RnM d NameSet
lookupOrigNames rdr_names
= mapRn lookupOrigName rdr_names `thenRn` \ names ->
returnRn (mkNameSet names)
\end{code}
-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.
+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}
lookupSysBinder rdr_name
\end{code}
-
%*********************************************************
%* *
\subsection{Binding}
%*********************************************************
\begin{code}
-newLocalsRn :: (Unique -> OccName -> SrcLoc -> Name)
- -> [(RdrName,SrcLoc)]
+newLocalsRn :: [(RdrName,SrcLoc)]
-> RnMS [Name]
-newLocalsRn mk_name rdr_names_w_loc
- = getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+newLocalsRn rdr_names_w_loc
+ = getNameSupplyRn `thenRn` \ name_supply ->
let
n = length rdr_names_w_loc
- (us', us1) = splitUniqSupply us
+ (us', us1) = splitUniqSupply (nsUniqs name_supply)
uniqs = uniqsFromSupply n us1
- names = [ mk_name uniq (rdrNameOcc rdr_name) loc
+ names = [ mkLocalName uniq (rdrNameOcc rdr_name) loc
| ((rdr_name,loc), uniq) <- rdr_names_w_loc `zip` uniqs
]
in
- setNameSupplyRn (us', cache, ipcache) `thenRn_`
+ setNameSupplyRn (name_supply {nsUniqs = us'}) `thenRn_`
returnRn names
-- Check for duplicate names
checkDupOrQualNames doc_str rdr_names_w_loc `thenRn_`
- doptRn Opt_WarnNameShadowing `thenRn` \ warn_shadow ->
+ doptRn Opt_WarnNameShadowing `thenRn` \ warn_shadow ->
-- Warn about shadowing, but only in source modules
(case mode of
other -> returnRn ()
) `thenRn_`
- let
- mk_name = case mode of
- SourceMode -> mkLocalName
- InterfaceMode -> mkImportedLocalName
- -- Keep track of whether the name originally came from
- -- an interface file.
- in
- newLocalsRn mk_name rdr_names_w_loc `thenRn` \ names ->
+ newLocalsRn rdr_names_w_loc `thenRn` \ names ->
let
new_local_env = addListToRdrEnv name_env (map fst rdr_names_w_loc `zip` names)
in
bindCoreLocalRn rdr_name enclosed_scope
= getSrcLocRn `thenRn` \ loc ->
getLocalNameEnv `thenRn` \ name_env ->
- getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+ getNameSupplyRn `thenRn` \ name_supply ->
let
- (us', us1) = splitUniqSupply us
+ (us', us1) = splitUniqSupply (nsUniqs name_supply)
uniq = uniqFromSupply us1
- name = mkImportedLocalName uniq (rdrNameOcc rdr_name) loc
+ name = mkLocalName uniq (rdrNameOcc rdr_name) loc
in
- setNameSupplyRn (us', cache, ipcache) `thenRn_`
+ setNameSupplyRn (name_supply {nsUniqs = us'}) `thenRn_`
let
new_name_env = extendRdrEnv name_env rdr_name name
in
where
pairs = [(mkRdrUnqual (nameOccName n), n) | n <- names]
+bindLocalNamesFV names enclosed_scope
+ = bindLocalNames names $
+ enclosed_scope `thenRn` \ (thing, fvs) ->
+ returnRn (thing, delListFromNameSet fvs names)
+
+
-------------------------------------
bindLocalRn doc rdr_name enclosed_scope
= getSrcLocRn `thenRn` \ loc ->
returnRn (thing, delListFromNameSet fvs names)
-------------------------------------
-bindUVarRn :: RdrName -> (Name -> RnMS a) -> RnMS a
-bindUVarRn = bindCoreLocalRn
-
--------------------------------------
extendTyVarEnvFVRn :: [Name] -> RnMS (a, FreeVars) -> RnMS (a, FreeVars)
- -- This tiresome function is used only in rnDecl on InstDecl
+ -- This tiresome function is used only in rnSourceDecl on InstDecl
extendTyVarEnvFVRn tyvars enclosed_scope
= bindLocalNames tyvars enclosed_scope `thenRn` \ (thing, fvs) ->
returnRn (thing, delListFromNameSet fvs tyvars)
mapRn_ (qualNameErr doc_str) quals `thenRn_`
checkDupNames doc_str rdr_names_w_loc
where
- quals = filter (isQual.fst) rdr_names_w_loc
+ quals = filter (isQual . fst) rdr_names_w_loc
checkDupNames doc_str rdr_names_w_loc
= -- Check for duplicated names in a binding group
%************************************************************************
\begin{code}
+mkGlobalRdrEnv :: ModuleName -- Imported module (after doing the "as M" name change)
+ -> Bool -- True <=> want unqualified import
+ -> Bool -- True <=> want qualified import
+ -> [AvailInfo] -- What's to be hidden (but only the unqualified
+ -- version is hidden)
+ -> (Name -> Provenance)
+ -> Avails -- Whats imported and how
+ -> GlobalRdrEnv
+
+mkGlobalRdrEnv this_mod unqual_imp qual_imp hides mk_provenance avails
+ = gbl_env2
+ where
+ -- Make the name environment. We're talking about a
+ -- single module here, so there must be no name clashes.
+ -- In practice there only ever will be if it's the module
+ -- being compiled.
+
+ -- Add the things that are available
+ gbl_env1 = foldl add_avail emptyRdrEnv avails
+
+ -- Delete things that are hidden
+ gbl_env2 = foldl del_avail gbl_env1 hides
+
+ add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv
+ add_avail env avail = foldl add_name env (availNames avail)
+
+ add_name env name
+ | qual_imp && unqual_imp = env3
+ | unqual_imp = env2
+ | qual_imp = env1
+ | otherwise = env
+ where
+ env1 = addOneToGlobalRdrEnv env (mkRdrQual this_mod occ) (name,prov)
+ env2 = addOneToGlobalRdrEnv env (mkRdrUnqual occ) (name,prov)
+ env3 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) (name,prov)
+ occ = nameOccName name
+ prov = mk_provenance name
+
+ del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names
+ where
+ rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail)
+
+mkIfaceGlobalRdrEnv :: [(ModuleName,Avails)] -> GlobalRdrEnv
+-- Used to construct a GlobalRdrEnv for an interface that we've
+-- read from a .hi file. We can't construct the original top-level
+-- environment because we don't have enough info, but we compromise
+-- by making an environment from its exports
+mkIfaceGlobalRdrEnv m_avails
+ = foldl add emptyRdrEnv m_avails
+ where
+ add env (mod,avails) = plusGlobalRdrEnv env (mkGlobalRdrEnv mod True False [] (\n -> LocalDef) avails)
+\end{code}
+
+\begin{code}
plusGlobalRdrEnv :: GlobalRdrEnv -> GlobalRdrEnv -> GlobalRdrEnv
plusGlobalRdrEnv env1 env2 = plusFM_C combine_globals env1 env2
\begin{code}
unQualInScope :: GlobalRdrEnv -> Name -> Bool
unQualInScope env
- = lookup
+ = (`elemNameSet` unqual_names)
where
- lookup name = case lookupRdrEnv env (mkRdrUnqual (nameOccName name)) of
- Just [(name',_)] -> name == name'
- other -> False
+ unqual_names :: NameSet
+ unqual_names = foldRdrEnv add emptyNameSet env
+ add rdr_name [(name,_)] unquals | isUnqual rdr_name = addOneToNameSet unquals name
+ add _ _ unquals = unquals
\end{code}
plusAvail (AvailTC n1 ns1) (AvailTC n2 ns2) = AvailTC n2 (nub (ns1 ++ ns2))
-- Added SOF 4/97
#ifdef DEBUG
-plusAvail a1 a2 = pprPanic "RnEnv.plusAvail" (hsep [pprAvail a1,pprAvail a2])
+plusAvail a1 a2 = pprPanic "RnEnv.plusAvail" (hsep [ppr a1,ppr a2])
#endif
addAvail :: AvailEnv -> AvailInfo -> AvailEnv
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;
-- get a canonical ordering
groupFM = foldl add emptyFM avails
- add env avail = addToFM_C combine env mod_fs [avail]
+ 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
+ combine old _ = avail':old
+ avail' = sortAvail avail
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
- ns' -> parens (hsep (punctuate comma (map ppr ns')))
-pprAvail (Avail n) = ppr n
+sortAvail :: AvailInfo -> AvailInfo
+-- Sort the sub-names into canonical order.
+-- The canonical order has the "main name" at the beginning
+-- (if it's there at all)
+sortAvail (Avail n) = Avail n
+sortAvail (AvailTC n ns) | n `elem` ns = AvailTC n (n : sortLt lt (filter (/= n) ns))
+ | otherwise = AvailTC n ( sortLt lt ns)
+ where
+ n1 `lt` n2 = nameOccName n1 < nameOccName n2
\end{code}
= case prov1 of
LocalDef -> (True, getSrcLoc name1, text "Defined but not used")
- NonLocalDef (UserImport mod loc _) _
+ NonLocalDef (UserImport mod loc _)
-> (True, loc, text "Imported from" <+> quotes (ppr mod) <+> text "but not used")
reportable (name,_) = case occNameUserString (nameOccName name) of
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