#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 ( getTyVarName, replaceTyVarName )
-
+import HsTypes ( hsTyVarName, replaceTyVarName )
+import HscTypes ( Provenance(..), pprNameProvenance, hasBetterProv,
+ ImportReason(..), GlobalRdrEnv, AvailEnv,
+ AvailInfo, Avails, GenAvailInfo(..), RdrAvailInfo )
import RnMonad
-import Name ( Name, Provenance(..), ExportFlag(..), NamedThing(..),
- ImportReason(..), getSrcLoc,
- mkLocalName, mkImportedLocalName, mkGlobalName, mkUnboundName,
- mkIPName, isSystemName,
- nameOccName, setNameModule, nameModule,
- pprOccName, isLocallyDefined, nameUnique, nameOccName,
- occNameUserString,
- setNameProvenance, getNameProvenance, pprNameProvenance
+import Name ( Name, NamedThing(..),
+ getSrcLoc,
+ mkLocalName, mkImportedLocalName, mkGlobalName,
+ mkIPName, nameOccName, nameModule,
+ extendNameEnv_C, plusNameEnv_C, nameEnvElts,
+ setNameModuleAndLoc
)
import NameSet
-import OccName ( OccName,
- mkDFunOcc, occNameUserString, occNameString,
- occNameFlavour
- )
-import TysWiredIn ( tupleTyCon, unboxedTupleTyCon, listTyCon )
-import Type ( funTyCon )
-import Module ( ModuleName, mkThisModule, moduleName, mkVanillaModule )
-import TyCon ( TyCon )
+import OccName ( OccName, occNameUserString, occNameFlavour )
+import Module ( ModuleName, moduleName, mkVanillaModule )
import FiniteMap
-import Unique ( Unique, Uniquable(..) )
-import UniqFM ( emptyUFM, listToUFM, plusUFM_C )
+import Unique ( Unique )
import UniqSupply
import SrcLoc ( SrcLoc, noSrcLoc )
import Outputable
-import Util ( removeDups, equivClasses, thenCmp )
+import ListSetOps ( removeDups, equivClasses )
+import Util ( sortLt )
import List ( nub )
-import Maybes ( mapMaybe )
+import PrelNames ( mkUnboundName )
+import CmdLineOpts
\end{code}
-
-
%*********************************************************
%* *
\subsection{Making new names}
%*********************************************************
\begin{code}
-newImportedGlobalName :: ModuleName -> OccName -> Module -> RnM d Name
-newImportedGlobalName mod_name occ mod
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- let
- key = (mod_name, occ)
- in
- case lookupFM cache key of
- Just name -> returnRn name
- Nothing -> setNameSupplyRn (us', inst_ns, new_cache, ipcache) `thenRn_`
- returnRn name
- where
- (us', us1) = splitUniqSupply us
- uniq = uniqFromSupply us1
- name = mkGlobalName uniq mod occ (NonLocalDef ImplicitImport False)
- new_cache = addToFM cache key name
-
-updateProvenances :: [Name] -> RnM d ()
-updateProvenances names
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- setNameSupplyRn (us, inst_ns, 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)
-
-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 (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)
-
-
-newLocalTopBinder :: Module -> OccName
- -> (Name -> ExportFlag) -> SrcLoc
- -> RnM d Name
-newLocalTopBinder mod occ rec_exp_fn loc
+newTopBinder :: Module -> RdrName -> SrcLoc -> RnM d Name
+newTopBinder mod rdr_name loc
= -- First check the cache
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
+ traceRn (text "newTopBinder" <+> ppr mod <+> ppr loc) `thenRn_`
+
+ getNameSupplyRn `thenRn` \ (us, 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
+ occ = rdrNameOcc rdr_name
+ key = (moduleName mod, occ)
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
+ -- 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 = setNameProvenance name (mk_prov new_name)
+ new_name = setNameModuleAndLoc name mod loc
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
-- Miss in the cache!
- -- Build a new original name, and put it in the cache
+ -- Build a completely new Name, and put it in the cache
+ -- Even for locally-defined names we use implicitImportProvenance;
+ -- updateProvenances will set it to rights
Nothing -> let
(us', us1) = splitUniqSupply us
uniq = uniqFromSupply us1
- new_name = mkGlobalName uniq mod occ (mk_prov new_name)
+ new_name = mkGlobalName uniq mod occ loc
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
-getIPName rdr_name
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
+
+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 (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
+ -- 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
+ -- *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).
+newGlobalName mod_name occ
+ = getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+ let
+ key = (mod_name, occ)
+ in
+ case lookupFM cache key of
+ 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_`
+ returnRn name
+ where
+ (us', us1) = splitUniqSupply us
+ 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) ->
case lookupFM ipcache key of
Just name -> returnRn name
- Nothing -> setNameSupplyRn (us', inst_ns, cache, new_ipcache) `thenRn_`
+ Nothing -> setNameSupplyRn (us', cache, new_ipcache) `thenRn_`
returnRn name
where
(us', us1) = splitUniqSupply us
%*********************************************************
%* *
-\subsection{Dfuns and default methods}
+\subsection{Looking up names}
%* *
%*********************************************************
-@newImplicitBinder@ is used for (a) dfuns
-(b) default methods, defined in this module.
+Looking up a name in the RnEnv.
\begin{code}
-newImplicitBinder occ src_loc
- = getModuleRn `thenRn` \ mod_name ->
- newLocalTopBinder (mkThisModule mod_name) occ (\_ -> Exported) src_loc
+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}
+%
-Make a name for the dict fun for an instance decl
+@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).
+
+ \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}
-newDFunName :: (OccName, OccName) -> SrcLoc -> RnMS Name
-newDFunName key@(cl_occ, tycon_occ) loc
- = newInstUniq string `thenRn` \ inst_uniq ->
- newImplicitBinder (mkDFunOcc string inst_uniq) loc
- where
- -- Any string that is somewhat unique will do
- string = occNameString cl_occ ++ occNameString tycon_occ
+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.
+
\begin{code}
-getDFunKey :: RenamedHsType -> (OccName, OccName) -- Used to manufacture DFun names
-getDFunKey (HsForAllTy _ _ ty) = getDFunKey ty
-getDFunKey (MonoFunTy _ ty) = getDFunKey ty
-getDFunKey (MonoDictTy cls (ty:_)) = (nameOccName cls, get_tycon_key ty)
-
-get_tycon_key (MonoTyVar tv) = nameOccName (getName tv)
-get_tycon_key (MonoTyApp ty _) = get_tycon_key ty
-get_tycon_key (MonoTupleTy tys True) = getOccName (tupleTyCon (length tys))
-get_tycon_key (MonoTupleTy tys False) = getOccName (unboxedTupleTyCon (length tys))
-get_tycon_key (MonoListTy _) = getOccName listTyCon
-get_tycon_key (MonoFunTy _ _) = getOccName funTyCon
+lookupSysBinder rdr_name
+ = ASSERT( isUnqual rdr_name )
+ getModuleRn `thenRn` \ mod ->
+ getSrcLocRn `thenRn` \ loc ->
+ newTopBinder mod rdr_name loc
\end{code}
+
%*********************************************************
%* *
\subsection{Binding}
%*********************************************************
\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 ->
getLocalNameEnv `thenRn` \ name_env ->
- (if opt_WarnNameShadowing
- then
- mapRn_ (check_shadow name_env) rdr_names_w_loc
- else
- returnRn ()
+
+ -- 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 | warn_shadow -> mapRn_ (check_shadow name_env) rdr_names_w_loc
+ other -> returnRn ()
) `thenRn_`
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- getModeRn `thenRn` \ mode ->
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', inst_ns, 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)
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
bindCoreLocalsFVRn bs $ \ names' ->
thing_inside (name':names')
+bindLocalNames names enclosed_scope
+ = getLocalNameEnv `thenRn` \ name_env ->
+ setLocalNameEnv (addListToRdrEnv name_env pairs)
+ enclosed_scope
+ where
+ pairs = [(mkRdrUnqual (nameOccName n), n) | n <- names]
+
-------------------------------------
bindLocalRn doc rdr_name enclosed_scope
= getSrcLocRn `thenRn` \ loc ->
bindUVarRn = bindLocalRn
-------------------------------------
-extendTyVarEnvFVRn :: [HsTyVar 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
- = getLocalNameEnv `thenRn` \ env ->
- let
- tyvar_names = map getTyVarName tyvars
- new_env = addListToRdrEnv env [ (mkRdrUnqual (getOccName name), name)
- | name <- tyvar_names
- ]
- in
- setLocalNameEnv new_env enclosed_scope `thenRn` \ (thing, fvs) ->
- returnRn (thing, delListFromNameSet fvs tyvar_names)
+ = bindLocalNames tyvars enclosed_scope `thenRn` \ (thing, fvs) ->
+ returnRn (thing, delListFromNameSet fvs tyvars)
-bindTyVarsRn :: SDoc -> [HsTyVar RdrName]
- -> ([HsTyVar Name] -> RnMS a)
+bindTyVarsRn :: SDoc -> [HsTyVarBndr RdrName]
+ -> ([HsTyVarBndr Name] -> RnMS a)
-> RnMS a
bindTyVarsRn doc_str tyvar_names enclosed_scope
= bindTyVars2Rn doc_str tyvar_names $ \ names tyvars ->
enclosed_scope tyvars
-- Gruesome name: return Names as well as HsTyVars
-bindTyVars2Rn :: SDoc -> [HsTyVar RdrName]
- -> ([Name] -> [HsTyVar Name] -> RnMS a)
+bindTyVars2Rn :: SDoc -> [HsTyVarBndr RdrName]
+ -> ([Name] -> [HsTyVarBndr Name] -> RnMS a)
-> RnMS a
bindTyVars2Rn doc_str tyvar_names enclosed_scope
= getSrcLocRn `thenRn` \ loc ->
let
- located_tyvars = [(getTyVarName tv, loc) | tv <- tyvar_names]
+ located_tyvars = [(hsTyVarName tv, loc) | tv <- tyvar_names]
in
bindLocatedLocalsRn doc_str located_tyvars $ \ names ->
enclosed_scope names (zipWith replaceTyVarName tyvar_names names)
-bindTyVarsFVRn :: SDoc -> [HsTyVar RdrName]
- -> ([HsTyVar Name] -> RnMS (a, FreeVars))
+bindTyVarsFVRn :: SDoc -> [HsTyVarBndr RdrName]
+ -> ([HsTyVarBndr Name] -> RnMS (a, FreeVars))
-> RnMS (a, FreeVars)
bindTyVarsFVRn doc_str rdr_names enclosed_scope
= bindTyVars2Rn doc_str rdr_names $ \ names tyvars ->
enclosed_scope tyvars `thenRn` \ (thing, fvs) ->
returnRn (thing, delListFromNameSet fvs names)
-bindTyVarsFV2Rn :: SDoc -> [HsTyVar RdrName]
- -> ([Name] -> [HsTyVar Name] -> RnMS (a, FreeVars))
+bindTyVarsFV2Rn :: SDoc -> [HsTyVarBndr RdrName]
+ -> ([Name] -> [HsTyVarBndr Name] -> RnMS (a, FreeVars))
-> RnMS (a, FreeVars)
bindTyVarsFV2Rn doc_str rdr_names enclosed_scope
= bindTyVars2Rn doc_str rdr_names $ \ names tyvars ->
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
\end{code}
-%*********************************************************
-%* *
-\subsection{Looking up names}
-%* *
-%*********************************************************
-
-Looking up a name in the RnEnv.
-
-\begin{code}
-lookupBndrRn rdr_name
- = 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
-
- 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 -> pprPanic "lookupBndrRn" (ppr mod <+> ppr rdr_name)
- }
-
--- Just like lookupRn except that we record the occurrence too
--- Perhaps surprisingly, even wired-in names are recorded.
--- Why? So that we know which wired-in names are referred to when
--- deciding which instance declarations to import.
-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
-
--- 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
-\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}
+\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 n' | n==n' && better_provenance n n' = n
- | otherwise = n'
-
--- Choose
--- a local thing over an imported thing
--- a user-imported thing over a non-user-imported thing
--- an explicitly-imported thing over an implicitly imported thing
-better_provenance n1 n2
- = case (getNameProvenance n1, getNameProvenance n2) of
- (LocalDef _ _, _ ) -> True
- (NonLocalDef (UserImport _ _ True) _, _ ) -> True
- (NonLocalDef (UserImport _ _ _ ) _, NonLocalDef ImplicitImport _) -> True
- other -> False
-
-is_duplicate :: Name -> Name -> Bool
-is_duplicate n1 n2 | isLocallyDefined n1 && isLocallyDefined n2 = False
- | otherwise = n1 == n2
+
+ choose n m | n `beats` m = n
+ | otherwise = m
+
+ (n,pn) `beats` (m,pm) = n==m && pn `hasBetterProv` pm
+
+ 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,
because they might be two separate, local defns and we want to report
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.
-
-\subsubsection{ExportAvails}% ================
+@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}
-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)
+unQualInScope :: GlobalRdrEnv -> Name -> Bool
+unQualInScope env
+ = lookup
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!
+ 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
#endif
addAvail :: AvailEnv -> AvailInfo -> AvailEnv
-addAvail avails avail = addToNameEnv_C plusAvail avails (availName avail) avail
+addAvail avails avail = extendNameEnv_C plusAvail avails (availName avail) avail
emptyAvailEnv = emptyNameEnv
unitAvailEnv :: AvailInfo -> AvailEnv
availsToNameSet :: [AvailInfo] -> NameSet
availsToNameSet avails = foldl addAvailToNameSet emptyNameSet avails
-availName :: AvailInfo -> Name
+availName :: GenAvailInfo name -> name
availName (Avail n) = n
availName (AvailTC n _) = n
-availNames :: AvailInfo -> [Name]
+availNames :: GenAvailInfo name -> [name]
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
+-------------------------------------
+sortAvails :: Avails -> Avails
+sortAvails avails = sortLt lt avails
+ where
+ a1 `lt` a2 = mod1 < mod2 ||
+ (mod1 == mod2 && occ1 < occ2)
+ where
+ name1 = availName a1
+ name2 = availName a2
+ mod1 = nameModule name1
+ mod2 = nameModule name2
+ occ1 = nameOccName name1
+ occ2 = nameOccName name2
+
+-------------------------------------
pprAvail :: AvailInfo -> SDoc
pprAvail (AvailTC n ns) = ppr n <> case filter (/= n) ns of
[] -> empty
\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}
-warnUnusedLocalBinds, warnUnusedImports, warnUnusedMatches :: [Name] -> RnM d ()
+warnUnusedModules :: [ModuleName] -> RnM d ()
+warnUnusedModules 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 (ppr m) <+>
+ text "is imported, but nothing from it is used",
+ parens (ptext SLIT("except perhaps to re-export instances visible in") <+>
+ quotes (ppr m))]
+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)])