#include "HsVersions.h"
-import CmdLineOpts ( opt_WarnNameShadowing, opt_WarnUnusedMatches,
- opt_WarnUnusedBinds, opt_WarnUnusedImports )
import HsSyn
-import RdrHsSyn ( RdrName(..), RdrNameIE,
- rdrNameOcc, isQual, qual
+import RdrHsSyn ( RdrNameIE )
+import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual,
+ mkRdrUnqual, qualifyRdrName
)
-import HsTypes ( getTyVarName, replaceTyVarName )
-import BasicTypes ( Fixity(..), FixityDirection(..), IfaceFlavour(..) )
+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, mkGlobalName,
- nameOccName,
- pprOccName, isLocalName, isLocallyDefined, isAnonOcc,
- 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, mkModuleFS,
- mkDFunOcc, tcOcc, varOcc, tvOcc,
- isVarOcc, occNameFlavour, occNameString
- )
-import TyCon ( TyCon )
+import OccName ( OccName, occNameUserString, occNameFlavour )
+import Module ( ModuleName, moduleName, mkVanillaModule )
import FiniteMap
-import Unique ( Unique, Uniquable(..), unboundKey )
-import UniqFM ( emptyUFM, listToUFM, plusUFM_C )
+import Unique ( Unique )
import UniqSupply
import SrcLoc ( SrcLoc, noSrcLoc )
import Outputable
-import Util ( removeDups )
+import ListSetOps ( removeDups, equivClasses )
+import Util ( sortLt )
import List ( nub )
-\end{code}
-
-
-
-%*********************************************************
-%* *
-\subsection{Making new rdr names}
-%* *
-%*********************************************************
-
-These functions make new RdrNames from stuff read from an interface file
-
-\begin{code}
-ifaceQualTC (m,n,hif) = Qual (mkModuleFS m) (tcOcc n) hif
-ifaceQualVar (m,n,hif) = Qual (mkModuleFS m) (varOcc n) hif
-
-ifaceUnqualTC n = Unqual (tcOcc n)
-ifaceUnqualVar n = Unqual (varOcc n)
-ifaceUnqualTv n = Unqual (tvOcc n)
+import PrelNames ( mkUnboundName )
+import CmdLineOpts
\end{code}
%*********************************************************
%*********************************************************
\begin{code}
-newImportedGlobalName :: Module -> OccName -> IfaceFlavour
- -> RnM s d Name
-newImportedGlobalName mod occ hif
+newTopBinder :: Module -> RdrName -> SrcLoc -> RnM d Name
+newTopBinder mod rdr_name loc
= -- First check the cache
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache) ->
- let
- key = (mod,occ)
- prov = NonLocalDef ImplicitImport hif False
- -- For in-scope things we improve the provenance in RnNames.qualifyImports
- in
- case lookupFM cache key of
-
- -- A hit in the cache!
- -- If it has no provenance at the moment then set its provenance
- -- so that it has the right HiFlag component.
- -- (This is necessary for known-key things.
- -- For example, GHCmain.lhs imports as SOURCE
- -- Main; but Main.main is a known-key thing.)
- -- Don't fiddle with the provenance if it already has one
- Just name -> case getNameProvenance name of
- NoProvenance -> let
- new_name = setNameProvenance name prov
- new_cache = addToFM cache key new_name
- in
- setNameSupplyRn (us, inst_ns, new_cache) `thenRn_`
- returnRn new_name
- other -> returnRn name
-
- Nothing -> -- Miss in the cache!
- -- Build a new original name, and put it in the cache
- let
- (us', us1) = splitUniqSupply us
- uniq = uniqFromSupply us1
- name = mkGlobalName uniq mod occ prov
- new_cache = addToFM cache key name
- in
- setNameSupplyRn (us', inst_ns, new_cache) `thenRn_`
- returnRn name
-
-
-newImportedGlobalFromRdrName (Qual mod_name occ hif)
- = newImportedGlobalName mod_name occ hif
+ traceRn (text "newTopBinder" <+> ppr mod <+> ppr loc) `thenRn_`
-newImportedGlobalFromRdrName (Unqual occ)
- = -- An Unqual is allowed; interface files contain
- -- unqualified names for locally-defined things, such as
- -- constructors of a data type.
- getModuleRn `thenRn ` \ mod_name ->
- newImportedGlobalName mod_name occ HiFile
-
-
-newLocallyDefinedGlobalName :: Module -> OccName
- -> (Name -> ExportFlag) -> SrcLoc
- -> RnM s d Name
-newLocallyDefinedGlobalName mod occ rec_exp_fn loc
- = -- First check the cache
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache) ->
+ getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
let
- key = (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) `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) `thenRn_`
+ setNameSupplyRn (us', new_cache, ipcache) `thenRn_`
+ traceRn (text "newTopBinder: new" <+> ppr new_name) `thenRn_`
returnRn new_name
-newLocalNames :: [(RdrName,SrcLoc)] -> RnM s d [Name]
-newLocalNames rdr_names
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache) ->
+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
- n = length rdr_names
- (us', us1) = splitUniqSupply us
- uniqs = uniqsFromSupply n us1
- -- Note: we're not making use of the source location. Not good.
- locals = [ mkLocalName uniq (rdrNameOcc rdr_name)
- | ((rdr_name,loc), uniq) <- rdr_names `zip` uniqs
- ]
+ key = (mod_name, occ)
in
- setNameSupplyRn (us', inst_ns, cache) `thenRn_`
- returnRn locals
+ 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', 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)
+\end{code}
-newDFunName cl_occ tycon_occ (Just n) src_loc -- Imported ones have "Just n"
- = getModuleRn `thenRn` \ mod_name ->
- newImportedGlobalName mod_name (rdrNameOcc n) HiFile {- Correct? -}
+%*********************************************************
+%* *
+\subsection{Looking up names}
+%* *
+%*********************************************************
-newDFunName cl_occ tycon_occ Nothing src_loc -- Local instance decls have a "Nothing"
- = getModuleRn `thenRn` \ mod_name ->
- newInstUniq (cl_occ, tycon_occ) `thenRn` \ inst_uniq ->
- let
- dfun_occ = mkDFunOcc cl_occ tycon_occ inst_uniq
- in
- newLocallyDefinedGlobalName mod_name dfun_occ (\_ -> Exported) src_loc
+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
--- mkUnboundName makes a place-holder Name; it shouldn't be looked at except possibly
--- during compiler debugging.
-mkUnboundName :: RdrName -> Name
-mkUnboundName rdr_name = mkLocalName unboundKey (rdrNameOcc 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
-isUnboundName :: Name -> Bool
-isUnboundName name = getUnique name == unboundKey
+-- 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).
+
+ \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}
--------------------------------------
-bindLocatedLocalsRn :: SDoc -- Documentation string for error message
+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}
+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 s a)
- -> RnMS s a
+ -> ([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_`
- newLocalNames rdr_names_w_loc `thenRn` \ names ->
let
- new_name_env = addListToRdrEnv name_env (map fst rdr_names_w_loc `zip` names)
+ 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 ->
+ let
+ 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)
= case lookupRdrEnv name_env rdr_name of
Just name -> pushSrcLocRn loc $
addWarnRn (shadowedNameWarn rdr_name)
+bindCoreLocalFVRn :: RdrName -> (Name -> RnMS (a, FreeVars))
+ -> RnMS (a, FreeVars)
+ -- A specialised variant when renaming stuff from interface
+ -- files (of which there is a lot)
+ -- * one at a time
+ -- * no checks for shadowing
+ -- * always imported
+ -- * deal with free vars
+bindCoreLocalFVRn rdr_name enclosed_scope
+ = getSrcLocRn `thenRn` \ loc ->
+ getLocalNameEnv `thenRn` \ name_env ->
+ getNameSupplyRn `thenRn` \ (us, cache, ipcache) ->
+ let
+ (us', us1) = splitUniqSupply us
+ uniq = uniqFromSupply us1
+ name = mkImportedLocalName uniq (rdrNameOcc rdr_name) loc
+ in
+ setNameSupplyRn (us', cache, ipcache) `thenRn_`
+ let
+ new_name_env = extendRdrEnv name_env rdr_name name
+ in
+ setLocalNameEnv new_name_env (enclosed_scope name) `thenRn` \ (result, fvs) ->
+ returnRn (result, delFromNameSet fvs name)
+
+bindCoreLocalsFVRn [] thing_inside = thing_inside []
+bindCoreLocalsFVRn (b:bs) thing_inside = bindCoreLocalFVRn b $ \ name' ->
+ 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]
-------------------------------------
-bindLocalsRn doc_str rdr_names enclosed_scope
+bindLocalRn doc rdr_name enclosed_scope
+ = getSrcLocRn `thenRn` \ loc ->
+ bindLocatedLocalsRn doc [(rdr_name,loc)] $ \ (n:ns) ->
+ ASSERT( null ns )
+ enclosed_scope n
+
+bindLocalsRn doc rdr_names enclosed_scope
= getSrcLocRn `thenRn` \ loc ->
- bindLocatedLocalsRn (text doc_str)
+ bindLocatedLocalsRn doc
(rdr_names `zip` repeat loc)
enclosed_scope
-- binLocalsFVRn is the same as bindLocalsRn
-- except that it deals with free vars
-bindLocalsFVRn doc_str rdr_names enclosed_scope
- = bindLocalsRn doc_str rdr_names $ \ names ->
+bindLocalsFVRn doc rdr_names enclosed_scope
+ = bindLocalsRn doc rdr_names $ \ names ->
enclosed_scope names `thenRn` \ (thing, fvs) ->
returnRn (thing, delListFromNameSet fvs names)
-------------------------------------
-extendTyVarEnvRn :: [HsTyVar Name] -> RnMS s a -> RnMS s a
+bindUVarRn :: SDoc -> RdrName -> (Name -> RnMS (a, FreeVars)) -> RnMS (a, FreeVars)
+bindUVarRn = bindLocalRn
+
+-------------------------------------
+extendTyVarEnvFVRn :: [Name] -> RnMS (a, FreeVars) -> RnMS (a, FreeVars)
-- This tiresome function is used only in rnDecl on InstDecl
-extendTyVarEnvRn tyvars enclosed_scope
- = getLocalNameEnv `thenRn` \ env ->
- let
- new_env = addListToRdrEnv env [ (Unqual (getOccName name), name)
- | tyvar <- tyvars,
- let name = getTyVarName tyvar
- ]
- in
- setLocalNameEnv new_env enclosed_scope
+extendTyVarEnvFVRn tyvars enclosed_scope
+ = bindLocalNames tyvars enclosed_scope `thenRn` \ (thing, fvs) ->
+ returnRn (thing, delListFromNameSet fvs tyvars)
-bindTyVarsRn :: SDoc -> [HsTyVar RdrName]
- -> ([HsTyVar Name] -> RnMS s a)
- -> RnMS s 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 s a)
- -> RnMS s 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 s (a, FreeVars))
- -> RnMS s (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 s (a, FreeVars))
- -> RnMS s (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
-> [(RdrName, SrcLoc)]
- -> RnM s d ()
+ -> RnM d ()
-- Works in any variant of the renamer monad
checkDupOrQualNames doc_str rdr_names_w_loc
= -- Check for use of qualified names
- mapRn (qualNameErr doc_str) quals `thenRn_`
+ mapRn_ (qualNameErr doc_str) quals `thenRn_`
checkDupNames doc_str rdr_names_w_loc
where
quals = filter (isQual.fst) rdr_names_w_loc
checkDupNames doc_str rdr_names_w_loc
- = -- Check for dupicated names in a binding group
- mapRn (dupNamesErr doc_str) dups `thenRn_`
- returnRn ()
+ = -- Check for duplicated names in a binding group
+ mapRn_ (dupNamesErr doc_str) dups
where
(_, dups) = removeDups (\(n1,l1) (n2,l2) -> n1 `compare` n2) rdr_names_w_loc
-
-
--- Yuk!
-ifaceFlavour name = case getNameProvenance name of
- NonLocalDef _ hif _ -> hif
- other -> HiFile -- Shouldn't happen
-\end{code}
-
-
-%*********************************************************
-%* *
-\subsection{Looking up names}
-%* *
-%*********************************************************
-
-Looking up a name in the RnEnv.
-
-\begin{code}
-checkUnboundRn :: RdrName -> Maybe Name -> RnMS s Name
-checkUnboundRn rdr_name (Just name)
- = -- Found it!
- returnRn name
-
-checkUnboundRn rdr_name Nothing
- = -- Not found by lookup
- 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 _ -> newImportedGlobalFromRdrName rdr_name
-
-lookupBndrRn rdr_name
- = lookupNameRn rdr_name `thenRn` \ maybe_name ->
- checkUnboundRn rdr_name maybe_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 s Name
-lookupOccRn rdr_name
- = lookupNameRn rdr_name `thenRn` \ maybe_name ->
- checkUnboundRn rdr_name maybe_name `thenRn` \ name ->
- let
- name' = mungePrintUnqual rdr_name name
- in
- addOccurrenceName 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 s Name
-lookupGlobalOccRn rdr_name
- = lookupGlobalNameRn rdr_name `thenRn` \ maybe_name ->
- checkUnboundRn rdr_name maybe_name `thenRn` \ name ->
- let
- name' = mungePrintUnqual rdr_name name
- in
- addOccurrenceName name'
-
-
--- mungePrintUnqual is used to make *imported* *occurrences* print unqualified
--- if they were mentioned unqualified in the source code.
--- This improves error messages from the type checker.
--- NB: the binding site is treated differently; see lookupBndrRn
--- After the type checker all occurrences are replaced by the one
--- at the binding site.
-mungePrintUnqual (Qual _ _ _) name = name
-mungePrintUnqual (Unqual _) name
- = case getNameProvenance name of
- NonLocalDef imp hif False -> setNameProvenance name (NonLocalDef imp hif True)
- other -> name
-
--- lookupImplicitOccRn takes an RdrName representing an *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).
--- [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.
-
-lookupImplicitOccRn :: RdrName -> RnMS s Name
-lookupImplicitOccRn (Qual mod occ hif)
- = newImportedGlobalName mod occ hif `thenRn` \ name ->
- addOccurrenceName name
-
-addImplicitOccRn :: Name -> RnMS s Name
-addImplicitOccRn name = addOccurrenceName name
-
-addImplicitOccsRn :: [Name] -> RnMS s ()
-addImplicitOccsRn names = addOccurrenceNames names
\end{code}
-\begin{code}
-lookupFixity :: Name -> RnMS s Fixity
-lookupFixity name
- = getFixityEnv `thenRn` \ fixity_env ->
- case lookupNameEnv fixity_env name of
- Just (FixitySig _ fixity _) -> returnRn fixity
- Nothing -> returnRn (Fixity 9 InfixL) -- Default case
-\end{code}
-
-mkPrintUnqualFn 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}
-mkPrintUnqualFn :: GlobalRdrEnv -> Name -> Bool
-mkPrintUnqualFn env
- = lookup
- where
- lookup name = case lookupRdrEnv env (Unqual (nameOccName name)) of
- Just [name'] -> name == name'
- other -> False
-\end{code}
%************************************************************************
%* *
-\subsection{Envt utility functions}
+\subsection{GlobalRdrEnv}
%* *
%************************************************************************
-=============== RnEnv ================
-\begin{code}
-plusRnEnv (RnEnv n1 f1) (RnEnv n2 f2)
- = RnEnv (n1 `plusGlobalRdrEnv` n2)
- (f1 `plusNameEnv` f2)
-\end{code}
-
-
-=============== NameEnv ================
\begin{code}
--- Look in global env only
-lookupGlobalNameRn :: RdrName -> RnMS s (Maybe Name)
-lookupGlobalNameRn rdr_name
- = getNameEnvs `thenRn` \ (global_env, local_env) ->
- lookup_global global_env rdr_name
-
--- Look in both local and global env
-lookupNameRn :: RdrName -> RnMS s (Maybe Name)
-lookupNameRn rdr_name
- = getNameEnvs `thenRn` \ (global_env, local_env) ->
- case lookupRdrEnv local_env rdr_name of
- Just name -> returnRn (Just name)
- Nothing -> lookup_global global_env rdr_name
-
-lookup_global global_env rdr_name
- = case lookupRdrEnv global_env rdr_name of
- Just [name] -> returnRn (Just name)
- Just stuff@(name:_) -> addNameClashErrRn rdr_name stuff `thenRn_`
- returnRn (Just name)
- Nothing -> returnRn Nothing
-
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 | all (no_conflict n) ns_old = map choose 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
-
-no_conflict :: Name -> Name -> Bool
-no_conflict n1 n2 | isLocallyDefined n1 && isLocallyDefined n2 = False
- | otherwise = n1 == n2
- -- We complain of a conflict if one RdrName maps to two different Names,
- -- OR if one RdrName maps to the same *locally-defined* Name. The latter
- -- case is to catch two separate, local definitions of the same thing.
- --
- -- If a module imports itself then there might be a local defn and an imported
- -- defn of the same name; in this case the names will compare as equal, but
- -- will still have different provenances
-\end{code}
+ add n ns | any (is_duplicate n) ns_old = map (choose n) ns -- Eliminate duplicates
+ | otherwise = n:ns
+ choose n m | n `beats` m = n
+ | otherwise = m
+ (n,pn) `beats` (m,pm) = n==m && pn `hasBetterProv` pm
-=============== ExportAvails ================
-\begin{code}
-mkEmptyExportAvails :: Module -> ExportAvails
-mkEmptyExportAvails mod_name = (unitFM mod_name [], emptyUFM)
-
-mkExportAvails :: Module -> 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
+ is_duplicate :: (Name,Provenance) -> (Name,Provenance) -> Bool
+ is_duplicate (n1,LocalDef) (n2,LocalDef) = False
+ is_duplicate (n1,_) (n2,_) = n1 == n2
+\end{code}
- -- 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
+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.
- unqual_avails | not unqual_imp = [] -- Short cut when no unqualified imports
- | otherwise = [prune avail | avail <- avails]
+On the other hand, if you import the same name from two different
+import statements, we {\em do} want to eliminate the duplicate, not report
+an error.
- prune (Avail n) | unqual_in_scope n = Avail n
- prune (Avail n) | otherwise = NotAvailable
- prune (AvailTC n ns) = AvailTC n (filter unqual_in_scope ns)
+If a module imports itself then there might be a local defn and an imported
+defn of the same name; in this case the names will compare as equal, but
+will still have different provenances.
- unqual_in_scope n = Unqual (nameOccName n) `elemFM` name_env
- entity_avail_env = listToUFM [ (name,avail) | avail <- avails,
- name <- availNames avail]
+@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.
-plusExportAvails :: ExportAvails -> ExportAvails -> ExportAvails
-plusExportAvails (m1, e1) (m2, e2)
- = (plusFM_C (++) m1 m2, plusUFM_C plusAvail e1 e2)
- -- ToDo: wasteful: we do this once for each constructor!
+\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}
-=============== AvailInfo ================
+%************************************************************************
+%* *
+\subsection{Avails}
+%* *
+%************************************************************************
+
\begin{code}
plusAvail (Avail n1) (Avail n2) = Avail n1
-plusAvail (AvailTC n1 ns1) (AvailTC n2 ns2) = AvailTC n1 (nub (ns1 ++ ns2))
-plusAvail a NotAvailable = a
-plusAvail NotAvailable a = a
+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])
#endif
+addAvail :: AvailEnv -> AvailInfo -> AvailEnv
+addAvail avails avail = extendNameEnv_C plusAvail avails (availName avail) avail
+
+emptyAvailEnv = emptyNameEnv
+unitAvailEnv :: AvailInfo -> AvailEnv
+unitAvailEnv a = unitNameEnv (availName a) a
+
+plusAvailEnv :: AvailEnv -> AvailEnv -> AvailEnv
+plusAvailEnv = plusNameEnv_C plusAvail
+
+availEnvElts = nameEnvElts
+
addAvailToNameSet :: NameSet -> AvailInfo -> NameSet
addAvailToNameSet names avail = addListToNameSet names (availNames avail)
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 NotAvailable = []
+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
- -> AvailInfo -- Resulting available;
- -- NotAvailable if (any of the) wanted stuff isn't there
+ -> Maybe AvailInfo -- Resulting available;
+ -- Nothing if (any of the) wanted stuff isn't there
filterAvail ie@(IEThingWith want wants) avail@(AvailTC n ns)
- | sub_names_ok = AvailTC n (filter is_wanted ns)
- | otherwise =
-#ifdef DEBUG
- pprTrace "filterAvail" (hsep [ppr ie, pprAvail avail]) $
-#endif
- NotAvailable
+ | sub_names_ok = Just (AvailTC n (filter is_wanted ns))
+ | otherwise = Nothing
where
is_wanted name = nameOccName name `elem` wanted_occs
sub_names_ok = all (`elem` avail_occs) wanted_occs
wanted_occs = map rdrNameOcc (want:wants)
filterAvail (IEThingAbs _) (AvailTC n ns) = ASSERT( n `elem` ns )
- AvailTC n [n]
-filterAvail (IEThingAll _) avail@(AvailTC _ _) = avail
+ Just (AvailTC n [n])
-filterAvail (IEVar _) avail@(Avail n) = avail
-filterAvail (IEVar v) avail@(AvailTC n ns) = AvailTC n (filter wanted ns)
+filterAvail (IEThingAbs _) avail@(Avail n) = Just avail -- Type synonyms
+
+filterAvail (IEVar _) avail@(Avail n) = Just avail
+filterAvail (IEVar v) avail@(AvailTC n ns) = Just (AvailTC n (filter wanted ns))
where
wanted n = nameOccName n == occ
occ = rdrNameOcc v
-- import A( op )
-- where op is a class operation
+filterAvail (IEThingAll _) avail@(AvailTC _ _) = Just avail
+ -- We don't complain even if the IE says T(..), but
+ -- no constrs/class ops of T are available
+ -- Instead that's caught with a warning by the caller
-#ifdef DEBUG
-filterAvail ie avail = pprPanic "filterAvail" (ppr ie $$ pprAvail avail)
-#endif
+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
+ ns' -> parens (hsep (punctuate comma (map ppr ns')))
--- In interfaces, pprAvail gets given the OccName of the "host" thing
-pprAvail avail = getPprStyle $ \ sty ->
- if ifaceStyle sty then
- ppr_avail (pprOccName . nameOccName) avail
- else
- ppr_avail ppr avail
-
-ppr_avail pp_name NotAvailable = ptext SLIT("NotAvailable")
-ppr_avail pp_name (AvailTC n ns) = hsep [
- pp_name n,
- parens $ hsep $ punctuate comma $
- map pp_name ns
- ]
-ppr_avail pp_name (Avail n) = pp_name n
+pprAvail (Avail n) = ppr n
\end{code}
-
-
%************************************************************************
%* *
\subsection{Free variable manipulation}
unitFV :: Name -> FreeVars
emptyFVs :: FreeVars
plusFVs :: [FreeVars] -> FreeVars
-
-plusFV = unionNameSets
-addOneFV = addOneToNameSet
-unitFV = unitNameSet
-emptyFVs = emptyNameSet
-plusFVs = unionManyNameSets
+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
+unitFV n = unitNameSet n
+
+-- A useful utility
+mapFvRn f xs = mapRn f xs `thenRn` \ stuff ->
+ let
+ (ys, fvs_s) = unzip stuff
+ in
+ returnRn (ys, plusFVs fvs_s)
\end{code}
%* *
%************************************************************************
-
\begin{code}
-warnUnusedBinds, warnUnusedMatches :: [Name] -> RnM s d ()
-
-warnUnusedTopNames ns
- | not opt_WarnUnusedBinds && not opt_WarnUnusedImports
- = returnRn () -- Don't force ns unless necessary
-
-warnUnusedTopNames (n:ns)
- | is_local && opt_WarnUnusedBinds = warnUnusedNames False{-include name's provenance-} ns
- | not is_local && opt_WarnUnusedImports = warnUnusedNames False ns
+warnUnusedModules :: [ModuleName] -> RnM d ()
+warnUnusedModules mods
+ = doptRn Opt_WarnUnusedImports `thenRn` \ warn ->
+ if warn then mapRn_ (addWarnRn . unused_mod) mods
+ else returnRn ()
where
- is_local = isLocallyDefined n
-
-warnUnusedTopName other = returnRn ()
-
-warnUnusedBinds ns
- | not opt_WarnUnusedBinds = returnRn ()
- | otherwise = warnUnusedNames False ns
-
-{-
- Haskell 98 encourages compilers to suppress warnings about
- unused names in a pattern if they start with "_". Which
- we do here.
+ 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
+ = doptRn Opt_WarnUnusedImports `thenRn` \ warn ->
+ if warn then warnUnusedBinds names else returnRn ()
+
+warnUnusedLocalBinds, warnUnusedMatches :: [Name] -> RnM d ()
+warnUnusedLocalBinds names
+ = doptRn Opt_WarnUnusedBinds `thenRn` \ warn ->
+ if warn then warnUnusedBinds [(n,LocalDef) | n<-names]
+ else returnRn ()
- Note: omit the inclusion of the names' provenance in the
- generated warning -- it's already given in the header
- of the warning (+ the local names we've been given have
- a provenance that's ultra low in content.)
-
--}
warnUnusedMatches names
- | opt_WarnUnusedMatches = warnUnusedNames True (filter (not.isAnonOcc.getOccName) names)
- | otherwise = returnRn ()
+ = doptRn Opt_WarnUnusedMatches `thenRn` \ warn ->
+ if warn then warnUnusedGroup [(n,LocalDef) | n<-names]
+ else returnRn ()
-warnUnusedNames :: Bool{-display provenance-} -> [Name] -> RnM s d ()
-warnUnusedNames _ []
- = returnRn ()
+-------------------------
-warnUnusedNames short_msg names
- = addWarnRn $
- sep [text "The following names are unused:",
- nest 4 ((if short_msg then hsep else vcat) (map pp names))]
+warnUnusedBinds :: [(Name,Provenance)] -> RnM d ()
+warnUnusedBinds names
+ = mapRn_ warnUnusedGroup groups
where
- pp n
- | short_msg = ppr n
- | otherwise = ppr n <> comma <+> pprNameProvenance n
-
-addNameClashErrRn rdr_name names
-{- NO LONGER NEEDED WITH LAZY NAME-CLASH REPORTING
- | isClassDataConRdrName rdr_name
- -- Nasty hack to prevent error messages complain about conflicts for ":C",
- -- where "C" is a class. There'll be a message about C, and :C isn't
- -- the programmer's business. There may be a better way to filter this
- -- out, but I couldn't get up the energy to find it.
- = returnRn ()
+ -- Group by provenance
+ groups = equivClasses cmp names
+ (_,prov1) `cmp` (_,prov2) = prov1 `compare` prov2
+
+
+-------------------------
+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.fst) filtered_names)))]
+ where
+ filtered_names = filter reportable names
+ (name1, prov1) = head filtered_names
+ (is_local, def_loc, msg)
+ = 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 (np1:nps)
= addErrRn (vcat [ptext SLIT("Ambiguous occurrence") <+> quotes (ppr rdr_name),
- ptext SLIT("It could refer to:") <+> vcat (map mk_ref names)])
+ ptext SLIT("It could refer to") <+> vcat (msg1 : msgs)])
where
- mk_ref name = ppr name <> colon <+> 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)])
dupNamesErr descriptor ((name,loc) : dup_things)
= pushSrcLocRn loc $
- addErrRn (hsep [ptext SLIT("Conflicting definitions for"),
- quotes (ppr name),
- ptext SLIT("in"), descriptor])
+ addErrRn ((ptext SLIT("Conflicting definitions for") <+> quotes (ppr name))
+ $$
+ (ptext SLIT("in") <+> descriptor))
\end{code}
-