#include "HsVersions.h"
-import CmdLineOpts ( opt_WarnNameShadowing, opt_WarnUnusedMatches,
- opt_WarnUnusedBinds, opt_WarnUnusedImports )
import HsSyn
import RdrHsSyn ( RdrNameIE )
-import RnHsSyn ( RenamedHsType )
import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual,
mkRdrUnqual, qualifyRdrName
)
import HsTypes ( hsTyVarName, hsTyVarNames, replaceTyVarName )
-
+import HscTypes ( Provenance(..), pprNameProvenance, hasBetterProv,
+ ImportReason(..), GlobalRdrEnv, Avails, AvailEnv,
+ AvailInfo, GenAvailInfo(..), RdrAvailInfo )
import RnMonad
-import Name ( Name, Provenance(..), ExportFlag(..), NamedThing(..),
- ImportReason(..), getSrcLoc,
- mkLocalName, mkImportedLocalName, mkGlobalName, mkUnboundName,
- mkIPName, isWiredInName, hasBetterProv,
- nameOccName, setNameModule, nameModule,
- pprOccName, isLocallyDefined, nameUnique,
- setNameProvenance, getNameProvenance, pprNameProvenance,
- extendNameEnv_C, plusNameEnv_C, nameEnvElts
+import Name ( Name, NamedThing(..),
+ getSrcLoc,
+ mkLocalName, mkImportedLocalName, mkGlobalName,
+ mkIPName, isLocallyDefined,
+ nameOccName, nameModule,
+ extendNameEnv_C, plusNameEnv_C, nameEnvElts,
+ setNameModuleAndLoc
)
import NameSet
-import OccName ( OccName,
- mkDFunOcc, occNameUserString, occNameString,
- occNameFlavour
- )
-import TysWiredIn ( listTyCon )
-import Type ( funTyCon )
-import Module ( ModuleName, mkThisModule, moduleName, mkVanillaModule, pprModuleName )
+import OccName ( OccName, occNameUserString, occNameFlavour )
+import Module ( ModuleName, moduleName, mkVanillaModule )
import FiniteMap
+import Unique ( Unique )
import UniqSupply
import SrcLoc ( SrcLoc, noSrcLoc )
import Outputable
-import Util ( removeDups, equivClasses, thenCmp, sortLt )
+import ListSetOps ( removeDups, equivClasses )
+import Util ( thenCmp, sortLt )
import List ( nub )
+import PrelNames ( mkUnboundName )
+import CmdLineOpts
\end{code}
-
-
%*********************************************************
%* *
\subsection{Making new names}
%*********************************************************
\begin{code}
-implicitImportProvenance = NonLocalDef ImplicitImport False
-
-newTopBinder :: Module -> OccName -> RnM d Name
-newTopBinder mod occ
+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
+ occ = rdrNameOcc rdr_name
key = (moduleName mod, occ)
in
case lookupFM cache key of
- -- A hit in the cache! We are at the binding site of the name, which is
- -- the time we know all about the Name's host Module (in particular, which
- -- package it comes from), so update the Module in the name.
- -- But otherwise *leave the Provenance alone*:
- --
- -- * For imported names, the Provenance may already be correct.
- -- e.g. We imported Prelude.hi, and set the provenance of PrelShow.Show
- -- to 'UserImport from Prelude'. Note that we havn't yet opened PrelShow.hi
- -- Later we find we really need PrelShow.Show, so we open PrelShow.hi, and
- -- that's when we find the binding occurrence of Show.
- --
- -- * For locally defined names, we do a setProvenance on the Name
- -- right after newTopBinder, and then use updateProveances to finally
- -- set the provenances in the cache correctly.
- --
- -- NB: for wired-in names it's important not to
- -- forget that they are wired in even when compiling that module
- -- (else we spit out redundant defns into the interface file)
+ -- A hit in the cache! We are at the binding site of the name, and
+ -- this is the moment when we know all about
+ -- a) the Name's host Module (in particular, which
+ -- package it comes from)
+ -- b) its defining SrcLoc
+ -- So we update this info
Just name -> let
- new_name = setNameModule name mod
+ new_name = setNameModuleAndLoc name mod loc
new_cache = addToFM cache key new_name
in
setNameSupplyRn (us, new_cache, ipcache) `thenRn_`
Nothing -> let
(us', us1) = splitUniqSupply us
uniq = uniqFromSupply us1
- new_name = mkGlobalName uniq mod occ implicitImportProvenance
+ new_name = mkGlobalName uniq mod occ loc
new_cache = addToFM cache key new_name
in
setNameSupplyRn (us', new_cache, ipcache) `thenRn_`
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
+ -- the binding occurence later (newTopBinder)
+ -- The place-holder Name doesn't have the right SrcLoc, and its
-- Module won't have the right Package either.
--
-- (We have to pass a ModuleName, not a Module, because we may be
(us', us1) = splitUniqSupply us
uniq = uniqFromSupply us1
mod = mkVanillaModule mod_name
- name = mkGlobalName uniq mod occ implicitImportProvenance
+ name = mkGlobalName uniq mod occ noSrcLoc
new_cache = addToFM cache key name
-
newIPName rdr_name
= getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
case lookupFM ipcache key of
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
--- 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, cache, ipcache) ->
- setNameSupplyRn (us, foldr update cache names, ipcache)
- where
- 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)
\end{code}
%*********************************************************
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@(name:_) -> addNameClashErrRn rdr_name stuff `thenRn_`
- returnRn name
+ 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)
\begin{code}
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
+ getModuleRn `thenRn` \ mod ->
+ getSrcLocRn `thenRn` \ loc ->
+ newTopBinder mod rdr_name loc
\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}
%*********************************************************
%*********************************************************
\begin{code}
+newLocalsRn :: (Unique -> OccName -> SrcLoc -> Name)
+ -> [(RdrName,SrcLoc)]
+ -> RnMS [Name]
+newLocalsRn mk_name rdr_names_w_loc
+ = getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+ let
+ n = length rdr_names_w_loc
+ (us', us1) = splitUniqSupply us
+ uniqs = uniqsFromSupply n us1
+ names = [ mk_name uniq (rdrNameOcc rdr_name) loc
+ | ((rdr_name,loc), uniq) <- rdr_names_w_loc `zip` uniqs
+ ]
+ in
+ setNameSupplyRn (us', cache, ipcache) `thenRn_`
+ returnRn names
+
+
bindLocatedLocalsRn :: SDoc -- Documentation string for error message
-> [(RdrName,SrcLoc)]
-> ([Name] -> RnMS a)
-> RnMS a
bindLocatedLocalsRn doc_str rdr_names_w_loc enclosed_scope
- = checkDupOrQualNames doc_str rdr_names_w_loc `thenRn_`
-
- getModeRn `thenRn` \ mode ->
+ = getModeRn `thenRn` \ mode ->
getLocalNameEnv `thenRn` \ name_env ->
- -- Warn about shadowing, but only in source modules
+ -- 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_`
- getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
let
- n = length rdr_names_w_loc
- (us', us1) = splitUniqSupply us
- uniqs = uniqsFromSupply n us1
- names = [ mk_name uniq (rdrNameOcc rdr_name) loc
- | ((rdr_name,loc), uniq) <- rdr_names_w_loc `zip` uniqs
- ]
mk_name = case mode of
SourceMode -> mkLocalName
InterfaceMode -> mkImportedLocalName
-- Keep track of whether the name originally came from
-- an interface file.
in
- setNameSupplyRn (us', cache, ipcache) `thenRn_`
-
+ newLocalsRn mk_name rdr_names_w_loc `thenRn` \ names ->
let
- new_name_env = addListToRdrEnv name_env (map fst rdr_names_w_loc `zip` names)
+ new_local_env = addListToRdrEnv name_env (map fst rdr_names_w_loc `zip` names)
in
- setLocalNameEnv new_name_env (enclosed_scope names)
+ setLocalNameEnv new_local_env (enclosed_scope names)
where
check_shadow name_env (rdr_name,loc)
bindUVarRn = bindLocalRn
-------------------------------------
-extendTyVarEnvFVRn :: [HsTyVarBndr Name] -> RnMS (a, FreeVars) -> RnMS (a, FreeVars)
+extendTyVarEnvFVRn :: [Name] -> RnMS (a, FreeVars) -> RnMS (a, FreeVars)
-- This tiresome function is used only in rnDecl on InstDecl
extendTyVarEnvFVRn tyvars enclosed_scope
- = bindLocalNames tyvar_names enclosed_scope `thenRn` \ (thing, fvs) ->
- returnRn (thing, delListFromNameSet fvs tyvar_names)
- where
- tyvar_names = hsTyVarNames tyvars
+ = bindLocalNames tyvars enclosed_scope `thenRn` \ (thing, fvs) ->
+ returnRn (thing, delListFromNameSet fvs tyvars)
bindTyVarsRn :: SDoc -> [HsTyVarBndr RdrName]
-> ([HsTyVarBndr Name] -> RnMS a)
enclosed_scope names tyvars `thenRn` \ (thing, fvs) ->
returnRn (thing, delListFromNameSet fvs names)
+bindNakedTyVarsFVRn :: SDoc -> [RdrName]
+ -> ([Name] -> RnMS (a, FreeVars))
+ -> RnMS (a, FreeVars)
+bindNakedTyVarsFVRn doc_str tyvar_names enclosed_scope
+ = getSrcLocRn `thenRn` \ loc ->
+ let
+ located_tyvars = [(tv, loc) | tv <- tyvar_names]
+ in
+ bindLocatedLocalsRn doc_str located_tyvars $ \ names ->
+ enclosed_scope names `thenRn` \ (thing, fvs) ->
+ returnRn (thing, delListFromNameSet fvs names)
+
-------------------------------------
checkDupOrQualNames, checkDupNames :: SDoc
%************************************************************************
%* *
-\subsection{Envt utility functions}
+\subsection{GlobalRdrEnv}
%* *
%************************************************************************
-\subsubsection{NameEnv}% ================
-
\begin{code}
plusGlobalRdrEnv :: GlobalRdrEnv -> GlobalRdrEnv -> GlobalRdrEnv
plusGlobalRdrEnv env1 env2 = plusFM_C combine_globals env1 env2
-addOneToGlobalRdrEnv :: GlobalRdrEnv -> RdrName -> Name -> GlobalRdrEnv
+addOneToGlobalRdrEnv :: GlobalRdrEnv -> RdrName -> (Name,Provenance) -> GlobalRdrEnv
addOneToGlobalRdrEnv env rdr_name name = addToFM_C combine_globals env rdr_name [name]
delOneFromGlobalRdrEnv :: GlobalRdrEnv -> RdrName -> GlobalRdrEnv
delOneFromGlobalRdrEnv env rdr_name = delFromFM env rdr_name
-combine_globals :: [Name] -- Old
- -> [Name] -- New
- -> [Name]
+combine_globals :: [(Name,Provenance)] -- Old
+ -> [(Name,Provenance)] -- New
+ -> [(Name,Provenance)]
combine_globals ns_old ns_new -- ns_new is often short
= foldr add ns_old ns_new
where
- add n ns | any (is_duplicate n) ns_old = map choose ns -- Eliminate duplicates
+ add n ns | any (is_duplicate n) ns_old = map (choose n) ns -- Eliminate duplicates
| otherwise = n:ns
- where
- choose m | n==m && n `hasBetterProv` m = n
- | otherwise = m
+ choose n m | n `beats` m = n
+ | otherwise = m
+
+ (n,pn) `beats` (m,pm) = n==m && pn `hasBetterProv` pm
-is_duplicate :: Name -> Name -> Bool
-is_duplicate n1 n2 | isLocallyDefined n1 && isLocallyDefined n2 = False
- | otherwise = 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,
and error for that, {\em not} eliminate a duplicate.
On the other hand, if you import the same name from two different
-import statements, we {\em d}* want to eliminate the duplicate, not report
+import statements, we {\em do} want to eliminate the duplicate, not report
an error.
If a module imports itself then there might be a local defn and an imported
will still have different provenances.
+@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}
+
-\subsubsection{AvailInfo}% ================
+%************************************************************************
+%* *
+\subsection{Avails}
+%* *
+%************************************************************************
\begin{code}
plusAvail (Avail n1) (Avail n2) = Avail n1
\end{code}
-
-
%************************************************************************
%* *
\subsection{Free variable manipulation}
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
%* *
%************************************************************************
-
-
\begin{code}
-warnUnusedModules :: [ModuleName] -> RnM d ()
+warnUnusedModules :: [Module] -> RnM d ()
warnUnusedModules mods
- | not opt_WarnUnusedImports = returnRn ()
- | otherwise = mapRn_ (addWarnRn . unused_mod) 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 (moduleName m)))]
-warnUnusedLocalBinds, warnUnusedImports, warnUnusedMatches :: [Name] -> RnM d ()
+warnUnusedImports :: [(Name,Provenance)] -> RnM d ()
warnUnusedImports names
- | not opt_WarnUnusedImports
- = returnRn () -- Don't force names unless necessary
- | otherwise
- = warnUnusedBinds (const True) names
+ = doptRn Opt_WarnUnusedImports `thenRn` \ warn ->
+ if warn then warnUnusedBinds names else returnRn ()
-warnUnusedLocalBinds ns
- | not opt_WarnUnusedBinds = returnRn ()
- | otherwise = warnUnusedBinds (const True) ns
+warnUnusedLocalBinds, warnUnusedMatches :: [Name] -> RnM d ()
+warnUnusedLocalBinds names
+ = doptRn Opt_WarnUnusedBinds `thenRn` \ warn ->
+ if warn then warnUnusedBinds [(n,LocalDef) | n<-names]
+ else returnRn ()
warnUnusedMatches names
- | opt_WarnUnusedMatches = warnUnusedGroup (const True) names
- | otherwise = returnRn ()
+ = doptRn Opt_WarnUnusedMatches `thenRn` \ warn ->
+ if warn then warnUnusedGroup [(n,LocalDef) | n<-names]
+ else returnRn ()
-------------------------
-warnUnusedBinds :: (Bool -> Bool) -> [Name] -> RnM d ()
-warnUnusedBinds warn_when_local names
- = mapRn_ (warnUnusedGroup warn_when_local) groups
+warnUnusedBinds :: [(Name,Provenance)] -> RnM d ()
+warnUnusedBinds names
+ = mapRn_ warnUnusedGroup groups
where
-- Group by provenance
groups = equivClasses cmp names
- name1 `cmp` name2 = getNameProvenance name1 `cmp_prov` getNameProvenance name2
+ (_,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
-------------------------
--- NOTE: the function passed to warnUnusedGroup is
--- now always (const True) so we should be able to
--- simplify the code slightly. I'm leaving it there
--- for now just in case I havn't realised why it was there.
--- Looks highly bogus to me. SLPJ Dec 99
-
-warnUnusedGroup :: (Bool -> Bool) -> [Name] -> RnM d ()
-warnUnusedGroup emit_warning names
- | null filtered_names = returnRn ()
- | not (emit_warning is_local) = returnRn ()
+warnUnusedGroup :: [(Name,Provenance)] -> RnM d ()
+warnUnusedGroup names
+ | null filtered_names = returnRn ()
+ | not is_local = returnRn ()
| 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 = head filtered_names
+ (name1, prov1) = head filtered_names
(is_local, def_loc, msg)
- = case getNameProvenance name1 of
- LocalDef loc _ -> (True, loc, text "Defined but not used")
- NonLocalDef (UserImport mod loc _) _ ->
- (True, loc, text "Imported from" <+> quotes (ppr mod) <+>
- text "but not used")
- other -> (False, getSrcLoc name1, text "Strangely defined but not used")
-
- reportable name = case occNameUserString (nameOccName name) of
- ('_' : _) -> False
- zz_other -> True
+ = case prov1 of
+ 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")
+
+ reportable (name,_) = case occNameUserString (nameOccName name) of
+ ('_' : _) -> False
+ zz_other -> True
-- Haskell 98 encourages compilers to suppress warnings about
-- unused names in a pattern if they start with "_".
\end{code}
\begin{code}
-addNameClashErrRn rdr_name (name1:names)
+addNameClashErrRn rdr_name (np1:nps)
= addErrRn (vcat [ptext SLIT("Ambiguous occurrence") <+> quotes (ppr rdr_name),
ptext SLIT("It could refer to") <+> vcat (msg1 : msgs)])
where
- msg1 = ptext SLIT("either") <+> mk_ref name1
- msgs = [ptext SLIT(" or") <+> mk_ref name | name <- names]
- mk_ref name = quotes (ppr name) <> comma <+> pprNameProvenance name
+ msg1 = ptext SLIT("either") <+> mk_ref np1
+ msgs = [ptext SLIT(" or") <+> mk_ref np | np <- nps]
+ mk_ref (name,prov) = quotes (ppr name) <> comma <+> pprNameProvenance name prov
fixityClashErr (rdr_name, ((_,how_in_scope1), (_, how_in_scope2)))
= hang (hsep [ptext SLIT("Conflicting fixities for"), quotes (ppr rdr_name)])
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