#include "HsVersions.h"
import HsSyn
-import HsPragmas ( DataPragmas(..) )
import RdrHsSyn ( RdrNameHsModule, RdrNameHsDecl, RdrNameDeprecation )
-import RnHsSyn ( RenamedHsModule, RenamedHsDecl,
+import RnHsSyn ( RenamedHsDecl,
extractHsTyNames, extractHsCtxtTyNames
)
-import CmdLineOpts ( opt_HiMap, opt_D_dump_rn_trace, opt_D_dump_minimal_imports,
- opt_D_dump_rn, opt_D_dump_rn_stats, opt_WarnDeprecations,
- opt_WarnUnusedBinds
- )
+import CmdLineOpts ( DynFlags, DynFlag(..) )
import RnMonad
import RnNames ( getGlobalNames )
import RnSource ( rnSourceDecls, rnDecl )
-import RnIfaces ( getImportedInstDecls, importDecl, mkImportExportInfo, getInterfaceExports,
- getImportedRules, getSlurped, removeContext,
- loadBuiltinRules, getDeferredDecls, ImportDeclResult(..)
+import RnIfaces ( getImportedInstDecls, importDecl, mkImportInfo,
+ getInterfaceExports,
+ getImportedRules, getSlurped,
+ ImportDeclResult(..)
)
+import RnHiFiles ( removeContext )
import RnEnv ( availName, availsToNameSet,
- emptyAvailEnv, unitAvailEnv, availEnvElts, plusAvailEnv,
+ emptyAvailEnv, unitAvailEnv, availEnvElts, plusAvailEnv, sortAvails,
warnUnusedImports, warnUnusedLocalBinds, warnUnusedModules,
- lookupOrigNames, unknownNameErr,
+ lookupOrigNames, lookupGlobalRn,
FreeVars, plusFVs, plusFV, unitFV, emptyFVs, isEmptyFVs, addOneFV
)
import Module ( Module, ModuleName, WhereFrom(..),
- moduleNameUserString, mkSearchPath, moduleName, mkThisModule
+ moduleNameUserString, moduleName,
+ lookupModuleEnv
)
import Name ( Name, isLocallyDefined, NamedThing(..), getSrcLoc,
- nameOccName, nameUnique, nameModule, maybeUserImportedFrom,
- isUserImportedExplicitlyName, isUserImportedName,
- maybeWiredInTyConName, maybeWiredInIdName,
- isUserExportedName, toRdrName,
- nameEnvElts, extendNameEnv
+ nameOccName, nameUnique, nameModule,
+ mkNameEnv, nameEnvElts, extendNameEnv
)
-import OccName ( occNameFlavour, isValOcc )
+import OccName ( occNameFlavour )
import Id ( idType )
import TyCon ( isSynTyCon, getSynTyConDefn )
import NameSet
import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon, boolTyCon )
-import PrelRules ( builtinRules )
-import PrelInfo ( mAIN_Name, pREL_MAIN_Name, pRELUDE_Name,
- ioTyCon_RDR, unpackCString_RDR, unpackCString2_RDR, unpackCStringFoldr_RDR,
- fractionalClassKeys, derivingOccurrences
+import PrelNames ( mAIN_Name, pREL_MAIN_Name, pRELUDE_Name,
+ ioTyCon_RDR,
+ unpackCString_RDR, unpackCStringFoldr_RDR, unpackCStringUtf8_RDR,
+ eqString_RDR
)
+import PrelInfo ( fractionalClassKeys, derivingOccurrences, wiredInThingEnv )
import Type ( namesOfType, funTyCon )
-import ErrUtils ( printErrorsAndWarnings, dumpIfSet, ghcExit )
-import BasicTypes ( Version, initialVersion )
+import ErrUtils ( printErrorsAndWarnings, dumpIfSet )
import Bag ( isEmptyBag, bagToList )
import FiniteMap ( FiniteMap, eltsFM, fmToList, emptyFM, lookupFM,
addToFM_C, elemFM, addToFM
)
-import UniqSupply ( UniqSupply )
import UniqFM ( lookupUFM )
-import SrcLoc ( noSrcLoc )
-import Maybes ( maybeToBool, expectJust )
+import Maybes ( maybeToBool, catMaybes )
import Outputable
import IO ( openFile, IOMode(..) )
+import HscTypes ( Finder, PersistentCompilerState, HomeIfaceTable, HomeSymbolTable,
+ ModIface(..), TyThing(..),
+ GlobalRdrEnv, AvailEnv, Avails, GenAvailInfo(..), AvailInfo,
+ Provenance(..), ImportReason(..), initialVersionInfo,
+ Deprecations(..), lookupDeprec
+ )
+import List ( partition, nub )
\end{code}
\begin{code}
-type RenameResult = ( Module -- This module
- , RenamedHsModule -- Renamed module
- , Maybe ParsedIface -- The existing interface file, if any
- , ParsedIface -- The new interface
- , RnNameSupply -- Final env; for renaming derivings
- , FixityEnv -- The fixity environment; for derivings
- , [ModuleName]) -- Imported modules; for profiling
-
-renameModule :: UniqSupply -> RdrNameHsModule -> IO (Maybe RenameResult)
-renameModule us this_mod@(HsModule mod_name vers exports imports local_decls _ loc)
+renameModule :: DynFlags -> Finder
+ -> HomeIfaceTable -> HomeSymbolTable
+ -> PersistentCompilerState
+ -> Module -> RdrNameHsModule
+ -> IO (PersistentCompilerState, Maybe (ModIface, [RenamedHsDecl]))
+
+renameModule dflags finder hit hst old_pcs this_module
+ this_mod@(HsModule _ _ _ _ _ _ loc)
= -- Initialise the renamer monad
do {
- ((maybe_rn_stuff, dump_action), rn_errs_bag, rn_warns_bag)
- <- initRn (mkThisModule mod_name) us
- (mkSearchPath opt_HiMap) loc
- (rename this_mod) ;
+ ((maybe_rn_stuff, dump_action), (rn_warns_bag, rn_errs_bag), new_pcs)
+ <- initRn dflags finder hit hst old_pcs this_module loc (rename this_module this_mod) ;
-- Check for warnings
- printErrorsAndWarnings rn_errs_bag rn_warns_bag ;
+ printErrorsAndWarnings (rn_warns_bag, rn_errs_bag) ;
-- Dump any debugging output
dump_action ;
-- Return results
if not (isEmptyBag rn_errs_bag) then
- do { ghcExit 1 ; return Nothing }
+ return (old_pcs, Nothing)
else
- return maybe_rn_stuff
+ return (new_pcs, maybe_rn_stuff)
}
\end{code}
\begin{code}
-rename :: RdrNameHsModule -> RnMG (Maybe RenameResult, IO ())
-rename this_mod@(HsModule mod_name vers exports imports local_decls mod_deprec loc)
+rename :: Module -> RdrNameHsModule -> RnMG (Maybe (ModIface, [RenamedHsDecl]), IO ())
+rename this_module this_mod@(HsModule mod_name vers exports imports local_decls mod_deprec loc)
= -- FIND THE GLOBAL NAME ENVIRONMENT
getGlobalNames this_mod `thenRn` \ maybe_stuff ->
rnDump [] [] `thenRn` \ dump_action ->
returnRn (Nothing, dump_action) ;
- Just (gbl_env, local_gbl_env, export_avails, global_avail_env, old_iface) ->
+ Just (gbl_env, local_gbl_env, export_avails, global_avail_env) ->
-- DEAL WITH DEPRECATIONS
- rnDeprecs local_gbl_env mod_deprec local_decls `thenRn` \ my_deprecs ->
+ rnDeprecs local_gbl_env mod_deprec
+ [d | DeprecD d <- local_decls] `thenRn` \ my_deprecs ->
-- DEAL WITH LOCAL FIXITIES
fixitiesFromLocalDecls local_gbl_env local_decls `thenRn` \ local_fixity_env ->
-- when compiling the prelude, locally-defined (), Bool, etc
-- override the implicit ones.
in
- loadBuiltinRules builtinRules `thenRn_`
slurpImpDecls slurp_fvs `thenRn` \ rn_imp_decls ->
-- EXIT IF ERRORS FOUND
else
-- GENERATE THE VERSION/USAGE INFO
- mkImportExportInfo mod_name export_avails exports `thenRn` \ (my_exports, my_usages) ->
+ mkImportInfo mod_name imports `thenRn` \ my_usages ->
-- RETURN THE RENAMED MODULE
- getNameSupplyRn `thenRn` \ name_supply ->
+ getNameSupplyRn `thenRn` \ name_supply ->
+ getIfacesRn `thenRn` \ ifaces ->
let
- this_module = mkThisModule mod_name
- direct_import_mods = [mod | ImportDecl mod _ _ _ _ _ <- imports]
-
- -- Export only those fixities that are for names that are
- -- (a) defined in this module
- -- (b) exported
- exported_fixities
- = [ FixitySig (toRdrName name) fixity loc
- | FixitySig name fixity loc <- nameEnvElts local_fixity_env,
- isUserExportedName name
- ]
-
- new_iface = ParsedIface { pi_mod = this_module
- , pi_vers = initialVersion
- , pi_orphan = any isOrphanDecl rn_local_decls
- , pi_exports = my_exports
- , pi_usages = my_usages
- , pi_fixity = (initialVersion, exported_fixities)
- , pi_deprecs = my_deprecs
- -- These ones get filled in later
- , pi_insts = [], pi_decls = []
- , pi_rules = (initialVersion, [])
- }
+ direct_import_mods :: [ModuleName]
+ direct_import_mods = nub [m | ImportDecl m _ _ _ _ _ <- imports]
+
+ -- We record fixities even for things that aren't exported,
+ -- so that we can change into the context of this moodule easily
+ fixities = mkNameEnv [ (name, fixity)
+ | FixitySig name fixity loc <- nameEnvElts local_fixity_env
+ ]
+
+
+ -- Sort the exports to make them easier to compare for versions
+ my_exports = sortAvails export_avails
- renamed_module = HsModule mod_name vers
- trashed_exports trashed_imports
- (rn_local_decls ++ rn_imp_decls)
- mod_deprec
- loc
-
- result = (this_module, renamed_module,
- old_iface, new_iface,
- name_supply, local_fixity_env,
- direct_import_mods)
+ mod_iface = ModIface { mi_module = this_module,
+ mi_version = initialVersionInfo,
+ mi_orphan = any isOrphanDecl rn_local_decls,
+ mi_exports = my_exports,
+ mi_globals = gbl_env,
+ mi_usages = my_usages,
+ mi_fixities = fixities,
+ mi_deprecs = my_deprecs,
+ mi_decls = panic "mi_decls"
+ }
+
+ final_decls = rn_local_decls ++ rn_imp_decls
in
-- REPORT UNUSED NAMES, AND DEBUG DUMP
export_avails source_fvs
rn_imp_decls `thenRn_`
- returnRn (Just result, dump_action) }
- where
- trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing
- trashed_imports = {-trace "rnSource:trashed_imports"-} []
+ returnRn (Just (mod_iface, final_decls), dump_action) }
\end{code}
@implicitFVs@ forces the renamer to slurp in some things which aren't
implicit_occs = string_occs ++ foldr ((++) . get) implicit_main decls
-- Virtually every program has error messages in it somewhere
- string_occs = [unpackCString_RDR, unpackCString2_RDR, unpackCStringFoldr_RDR]
+ string_occs = [unpackCString_RDR, unpackCStringFoldr_RDR, unpackCStringUtf8_RDR,
+ eqString_RDR]
- get (TyClD (TyData _ _ _ _ _ _ (Just deriv_classes) _ _))
+ get (TyClD (TyData _ _ _ _ _ _ (Just deriv_classes) _ _ _))
= concat (map get_deriv deriv_classes)
get other = []
check (HsVar v) = not (isLocallyDefined v)
check (HsApp f a) = check f && check a
check (HsLit _) = False
+ check (HsOverLit _) = False
check (OpApp l o _ r) = check l && check o && check r
check (NegApp e _) = check e
check (HsPar e) = check e
\end{code}
-\begin{code}
-dupDefaultDeclErrRn (DefaultDecl _ locn1 : dup_things)
- = pushSrcLocRn locn1 $
- addErrRn msg
- where
- msg = hang (ptext SLIT("Multiple default declarations"))
- 4 (vcat (map pp dup_things))
- pp (DefaultDecl _ locn) = ptext SLIT("here was another default declaration") <+> ppr locn
-\end{code}
-
-
%*********************************************************
%* *
\subsection{Slurping declarations}
\begin{code}
slurpDeferredDecls :: [RenamedHsDecl] -> RnMG [RenamedHsDecl]
+slurpDeferredDecls decls = returnRn decls
+
+{- OMIT FOR NOW
+slurpDeferredDecls :: [RenamedHsDecl] -> RnMG [RenamedHsDecl]
slurpDeferredDecls decls
= getDeferredDecls `thenRn` \ def_decls ->
rnIfaceDecls decls emptyFVs (map stripDecl def_decls) `thenRn` \ (decls1, fvs) ->
ASSERT( isEmptyFVs fvs )
returnRn decls1
-stripDecl (mod, TyClD (TyData dt _ tc tvs _ nconstrs _ _ loc))
- = (mod, TyClD (TyData dt [] tc tvs [] nconstrs Nothing NoDataPragmas loc))
+stripDecl (mod, TyClD (TyData dt _ tc tvs _ nconstrs _ loc name1 name2))
+ = (mod, TyClD (TyData dt [] tc tvs [] nconstrs Nothing loc
+ name1 name2))
-- Nuke the context and constructors
-- But retain the *number* of constructors!
-- Also the tvs will have kinds on them.
+-}
\end{code}
getGates source_fvs (SigD (IfaceSig _ ty _ _))
= extractHsTyNames ty
-getGates source_fvs (TyClD (ClassDecl ctxt cls tvs _ sigs _ _ _ _ _ _ _))
+getGates source_fvs (TyClD (ClassDecl ctxt cls tvs _ sigs _ _ _ ))
= (delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) sigs)
(hsTyVarNames tvs)
`addOneToNameSet` cls)
(hsTyVarNames tvs)
-- A type synonym type constructor isn't a "gate" for instance decls
-getGates source_fvs (TyClD (TyData _ ctxt tycon tvs cons _ _ _ _))
+getGates source_fvs (TyClD (TyData _ ctxt tycon tvs cons _ _ _ _ _))
= delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) cons)
(hsTyVarNames tvs)
`addOneToNameSet` tycon
get_details (VanillaCon tys) = plusFVs (map get_bang tys)
get_details (InfixCon t1 t2) = get_bang t1 `plusFV` get_bang t2
get_details (RecCon fields) = plusFVs [get_bang t | (_, t) <- fields]
- get_details (NewCon t _) = extractHsTyNames t
get_field (fs,t) | any (`elemNameSet` source_fvs) fs = get_bang t
| otherwise = emptyFVs
\begin{code}
getWiredInGates :: Name -> FreeVars
getWiredInGates name -- No classes are wired in
- | is_id = getWiredInGates_s (namesOfType (idType the_id))
- | isSynTyCon the_tycon = getWiredInGates_s
- (delListFromNameSet (namesOfType ty) (map getName tyvars))
- | otherwise = unitFV name
- where
- maybe_wired_in_id = maybeWiredInIdName name
- is_id = maybeToBool maybe_wired_in_id
- maybe_wired_in_tycon = maybeWiredInTyConName name
- Just the_id = maybe_wired_in_id
- Just the_tycon = maybe_wired_in_tycon
- (tyvars,ty) = getSynTyConDefn the_tycon
+ = case lookupNameEnv wiredInThingEnv name of
+ Just (AnId the_id) -> getWiredInGates_s (namesOfType (idType the_id))
+
+ Just (ATyCon tc)
+ | isSynTyCon tc
+ -> getWiredInGates_s (delListFromNameSet (namesOfType ty) (map getName tyvars))
+ where
+ (tyvars,ty) = getSynTyConDefn tc
+
+ other -> unitFV name
getWiredInGates_s names = foldr (plusFV . getWiredInGates) emptyFVs (nameSetToList names)
\end{code}
%*********************************************************
\begin{code}
-fixitiesFromLocalDecls :: GlobalRdrEnv -> [RdrNameHsDecl] -> RnMG FixityEnv
+fixitiesFromLocalDecls :: GlobalRdrEnv -> [RdrNameHsDecl] -> RnMG LocalFixityEnv
fixitiesFromLocalDecls gbl_env decls
- = foldlRn getFixities emptyNameEnv decls `thenRn` \ env ->
- traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts env))) `thenRn_`
+ = doptRn Opt_WarnUnusedBinds `thenRn` \ warn_unused ->
+ foldlRn (getFixities warn_unused) emptyNameEnv decls `thenRn` \ env ->
+ traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts env)))
+ `thenRn_`
returnRn env
where
- getFixities :: FixityEnv -> RdrNameHsDecl -> RnMG FixityEnv
- getFixities acc (FixD fix)
- = fix_decl acc fix
+ getFixities :: Bool -> LocalFixityEnv -> RdrNameHsDecl -> RnMG LocalFixityEnv
+ getFixities warn_uu acc (FixD fix)
+ = fix_decl warn_uu acc fix
- getFixities acc (TyClD (ClassDecl _ _ _ _ sigs _ _ _ _ _ _ _))
- = foldlRn fix_decl acc [sig | FixSig sig <- sigs]
+ getFixities warn_uu acc (TyClD (ClassDecl _ _ _ _ sigs _ _ _ ))
+ = foldlRn (fix_decl warn_uu) acc [sig | FixSig sig <- sigs]
-- Get fixities from class decl sigs too.
- getFixities acc other_decl
+ getFixities warn_uu acc other_decl
= returnRn acc
- fix_decl acc sig@(FixitySig rdr_name fixity loc)
+ fix_decl warn_uu acc sig@(FixitySig rdr_name fixity loc)
= -- Check for fixity decl for something not declared
- case lookupRdrEnv gbl_env rdr_name of {
- Nothing | opt_WarnUnusedBinds
- -> pushSrcLocRn loc (addWarnRn (unusedFixityDecl rdr_name fixity))
- `thenRn_` returnRn acc
- | otherwise -> returnRn acc ;
-
- Just (name:_) ->
+ pushSrcLocRn loc $
+ lookupGlobalRn gbl_env rdr_name `thenRn` \ maybe_name ->
+ case maybe_name of {
+ Nothing -> checkRn (not warn_uu) (unusedFixityDecl rdr_name fixity) `thenRn_`
+ returnRn acc ;
+
+ Just name ->
-- Check for duplicate fixity decl
case lookupNameEnv acc name of {
\begin{code}
rnDeprecs :: GlobalRdrEnv -> Maybe DeprecTxt
- -> [RdrNameHsDecl] -> RnMG [RdrNameDeprecation]
-rnDeprecs gbl_env mod_deprec decls
- = mapRn rn_deprec deprecs `thenRn_`
- returnRn (extra_deprec ++ deprecs)
+ -> [RdrNameDeprecation] -> RnMG Deprecations
+rnDeprecs gbl_env Nothing []
+ = returnRn NoDeprecs
+
+rnDeprecs gbl_env (Just txt) decls
+ = mapRn (addErrRn . badDeprec) decls `thenRn_`
+ returnRn (DeprecAll txt)
+
+rnDeprecs gbl_env Nothing decls
+ = mapRn rn_deprec decls `thenRn` \ pairs ->
+ returnRn (DeprecSome (mkNameEnv (catMaybes pairs)))
where
- deprecs = [d | DeprecD d <- decls]
- extra_deprec = case mod_deprec of
- Nothing -> []
- Just txt -> [Deprecation (IEModuleContents undefined) txt noSrcLoc]
-
- rn_deprec (Deprecation ie txt loc)
- = pushSrcLocRn loc $
- mapRn check (ieNames ie)
-
- check n = case lookupRdrEnv gbl_env n of
- Nothing -> addErrRn (unknownNameErr n)
- Just _ -> returnRn ()
+ rn_deprec (Deprecation rdr_name txt loc)
+ = pushSrcLocRn loc $
+ lookupGlobalRn gbl_env rdr_name `thenRn` \ maybe_name ->
+ case maybe_name of
+ Just n -> returnRn (Just (n,txt))
+ Nothing -> returnRn Nothing
\end{code}
gbl_env avail_env
export_avails mentioned_names
imported_decls
- = let
- used_names = mentioned_names `unionNameSets` availsToNameSet export_avails
-
- -- Now, a use of C implies a use of T,
- -- if C was brought into scope by T(..) or T(C)
- really_used_names = used_names `unionNameSets`
- mkNameSet [ availName parent_avail
- | sub_name <- nameSetToList used_names
- , isValOcc (getOccName sub_name)
-
- -- Usually, every used name will appear in avail_env, but there
- -- is one time when it doesn't: tuples and other built in syntax. When you
- -- write (a,b) that gives rise to a *use* of "(,)", so that the
- -- instances will get pulled in, but the tycon "(,)" isn't actually
- -- in scope. Hence the isValOcc filter.
- --
- -- Also, (-x) gives rise to an implicit use of 'negate'; similarly,
- -- 3.5 gives rise to an implcit use of :%
- -- hence the isUserImportedName filter on the warning
-
- , let parent_avail
- = case lookupNameEnv avail_env sub_name of
- Just avail -> avail
- Nothing -> WARN( isUserImportedName sub_name,
- text "reportUnusedName: not in avail_env" <+>
- ppr sub_name )
- Avail sub_name
-
- , case parent_avail of { AvailTC _ _ -> True; other -> False }
- ]
-
- defined_names = mkNameSet (concat (rdrEnvElts gbl_env))
- defined_but_not_used =
- nameSetToList (defined_names `minusNameSet` really_used_names)
-
- -- Filter out the ones only defined implicitly
- bad_locals = [n | n <- defined_but_not_used, isLocallyDefined n]
- bad_imp_names = [n | n <- defined_but_not_used, isUserImportedExplicitlyName n,
- not (module_unused n)]
-
- deprec_used deprec_env = [ (n,txt)
- | n <- nameSetToList mentioned_names,
- not (isLocallyDefined n),
- Just txt <- [lookupNameEnv deprec_env n] ]
-
- -- inst_mods are directly-imported modules that
- -- contain instance decl(s) that the renamer decided to suck in
- -- It's not necessarily redundant to import such modules.
- --
- -- NOTE: Consider
- -- module This
- -- import M ()
- --
- -- The import M() is not *necessarily* redundant, even if
- -- we suck in no instance decls from M (e.g. it contains
- -- no instance decls, or This contains no code). It may be
- -- that we import M solely to ensure that M's orphan instance
- -- decls (or those in its imports) are visible to people who
- -- import This. Sigh.
- -- There's really no good way to detect this, so the error message
- -- in RnEnv.warnUnusedModules is weakened instead
- inst_mods = [m | InstD (InstDecl _ _ _ (Just dfun) _) <- imported_decls,
- let m = moduleName (nameModule dfun),
- m `elem` direct_import_mods
- ]
-
- minimal_imports :: FiniteMap ModuleName AvailEnv
- minimal_imports0 = emptyFM
- minimal_imports1 = foldNameSet add_name minimal_imports0 really_used_names
- minimal_imports = foldr add_inst_mod minimal_imports1 inst_mods
-
- add_name n acc = case maybeUserImportedFrom n of
- Nothing -> acc
- Just m -> addToFM_C plusAvailEnv acc (moduleName m)
- (unitAvailEnv (mk_avail n))
- add_inst_mod m acc
- | m `elemFM` acc = acc -- We import something already
- | otherwise = addToFM acc m emptyAvailEnv
- -- Add an empty collection of imports for a module
- -- from which we have sucked only instance decls
-
- mk_avail n = case lookupNameEnv avail_env n of
- Just (AvailTC m _) | n==m -> AvailTC n [n]
- | otherwise -> AvailTC m [n,m]
- Just avail -> Avail n
- Nothing -> pprPanic "mk_avail" (ppr n)
-
- -- unused_imp_mods are the directly-imported modules
- -- that are not mentioned in minimal_imports
- unused_imp_mods = [m | m <- direct_import_mods,
- not (maybeToBool (lookupFM minimal_imports m))]
-
- module_unused :: Name -> Bool
- -- Name is imported from a module that's completely unused,
- -- so don't report stuff about the name (the module covers it)
- module_unused n = moduleName (expectJust "module_unused" (maybeUserImportedFrom n))
- `elem` unused_imp_mods
- -- module_unused is only called if it's user-imported
- in
- warnUnusedModules unused_imp_mods `thenRn_`
+ = warnUnusedModules unused_imp_mods `thenRn_`
warnUnusedLocalBinds bad_locals `thenRn_`
warnUnusedImports bad_imp_names `thenRn_`
printMinimalImports mod_name minimal_imports `thenRn_`
- getIfacesRn `thenRn` \ ifaces ->
- (if opt_WarnDeprecations
- then mapRn_ warnDeprec (deprec_used (iDeprecs ifaces))
- else returnRn ())
+ warnDeprecations really_used_names `thenRn_`
+ returnRn ()
+
+ where
+ used_names = mentioned_names `unionNameSets` availsToNameSet export_avails
+
+ -- Now, a use of C implies a use of T,
+ -- if C was brought into scope by T(..) or T(C)
+ really_used_names = used_names `unionNameSets`
+ mkNameSet [ parent_name
+ | sub_name <- nameSetToList used_names
+
+ -- Usually, every used name will appear in avail_env, but there
+ -- is one time when it doesn't: tuples and other built in syntax. When you
+ -- write (a,b) that gives rise to a *use* of "(,)", so that the
+ -- instances will get pulled in, but the tycon "(,)" isn't actually
+ -- in scope. Also, (-x) gives rise to an implicit use of 'negate';
+ -- similarly, 3.5 gives rise to an implcit use of :%
+ -- Hence the silent 'False' in all other cases
+
+ , Just parent_name <- [case lookupNameEnv avail_env sub_name of
+ Just (AvailTC n _) -> Just n
+ other -> Nothing]
+ ]
+
+ defined_names, defined_and_used, defined_but_not_used :: [(Name,Provenance)]
+ defined_names = concat (rdrEnvElts gbl_env)
+ (defined_and_used, defined_but_not_used) = partition used defined_names
+ used (name,_) = not (name `elemNameSet` really_used_names)
+
+ -- Filter out the ones only defined implicitly
+ bad_locals :: [Name]
+ bad_locals = [n | (n,LocalDef) <- defined_but_not_used]
+
+ bad_imp_names :: [(Name,Provenance)]
+ bad_imp_names = [(n,p) | (n,p@(NonLocalDef (UserImport mod _ True) _)) <- defined_but_not_used,
+ not (module_unused mod)]
+
+ -- inst_mods are directly-imported modules that
+ -- contain instance decl(s) that the renamer decided to suck in
+ -- It's not necessarily redundant to import such modules.
+ --
+ -- NOTE: Consider
+ -- module This
+ -- import M ()
+ --
+ -- The import M() is not *necessarily* redundant, even if
+ -- we suck in no instance decls from M (e.g. it contains
+ -- no instance decls, or This contains no code). It may be
+ -- that we import M solely to ensure that M's orphan instance
+ -- decls (or those in its imports) are visible to people who
+ -- import This. Sigh.
+ -- There's really no good way to detect this, so the error message
+ -- in RnEnv.warnUnusedModules is weakened instead
+ inst_mods :: [ModuleName]
+ inst_mods = [m | InstD (InstDecl _ _ _ (Just dfun) _) <- imported_decls,
+ let m = moduleName (nameModule dfun),
+ m `elem` direct_import_mods
+ ]
+
+ -- To figure out the minimal set of imports, start with the things
+ -- that are in scope (i.e. in gbl_env). Then just combine them
+ -- into a bunch of avails, so they are properly grouped
+ minimal_imports :: FiniteMap ModuleName AvailEnv
+ minimal_imports0 = emptyFM
+ minimal_imports1 = foldr add_name minimal_imports0 defined_and_used
+ minimal_imports = foldr add_inst_mod minimal_imports1 inst_mods
+
+ add_name (n,NonLocalDef (UserImport m _ _) _) acc = addToFM_C plusAvailEnv acc (moduleName (nameModule n))
+ (unitAvailEnv (mk_avail n))
+ add_name (n,other_prov) acc = acc
+
+ mk_avail n = case lookupNameEnv avail_env n of
+ Just (AvailTC m _) | n==m -> AvailTC n [n]
+ | otherwise -> AvailTC m [n,m]
+ Just avail -> Avail n
+ Nothing -> pprPanic "mk_avail" (ppr n)
+
+ add_inst_mod m acc
+ | m `elemFM` acc = acc -- We import something already
+ | otherwise = addToFM acc m emptyAvailEnv
+ -- Add an empty collection of imports for a module
+ -- from which we have sucked only instance decls
+
+ -- unused_imp_mods are the directly-imported modules
+ -- that are not mentioned in minimal_imports
+ unused_imp_mods = [m | m <- direct_import_mods,
+ not (maybeToBool (lookupFM minimal_imports m)),
+ m /= pRELUDE_Name]
+
+ module_unused :: Module -> Bool
+ module_unused mod = moduleName mod `elem` unused_imp_mods
+
+
+warnDeprecations used_names
+ = doptRn Opt_WarnDeprecations `thenRn` \ warn_drs ->
+ if not warn_drs then returnRn () else
+
+ getIfacesRn `thenRn` \ ifaces ->
+ getHomeIfaceTableRn `thenRn` \ hit ->
+ let
+ pit = iPIT ifaces
+ deprecs = [ (n,txt)
+ | n <- nameSetToList used_names,
+ Just txt <- [lookup_deprec hit pit n] ]
+ in
+ mapRn_ warnDeprec deprecs
+
+ where
+ lookup_deprec hit pit n
+ = case lookupModuleEnv hit mod of
+ Just iface -> lookupDeprec iface n
+ Nothing -> case lookupModuleEnv pit mod of
+ Just iface -> lookupDeprec iface n
+ Nothing -> pprPanic "warnDeprecations:" (ppr n)
+ where
+ mod = nameModule n
-- ToDo: deal with original imports with 'qualified' and 'as M' clauses
printMinimalImports mod_name imps
- | not opt_D_dump_minimal_imports
- = returnRn ()
- | otherwise
- = mapRn to_ies (fmToList imps) `thenRn` \ mod_ies ->
+ = doptRn Opt_D_dump_minimal_imports `thenRn` \ dump_minimal ->
+ if not dump_minimal then returnRn () else
+
+ mapRn to_ies (fmToList imps) `thenRn` \ mod_ies ->
ioToRnM (do { h <- openFile filename WriteMode ;
printForUser h (vcat (map ppr_mod_ie mod_ies))
}) `thenRn_`
-> [RenamedHsDecl] -- Renamed local decls
-> RnMG (IO ())
rnDump imp_decls local_decls
- | opt_D_dump_rn_trace ||
- opt_D_dump_rn_stats ||
- opt_D_dump_rn
- = getRnStats imp_decls `thenRn` \ stats_msg ->
-
- returnRn (printErrs stats_msg >>
- dumpIfSet opt_D_dump_rn "Renamer:"
- (vcat (map ppr (local_decls ++ imp_decls))))
-
- | otherwise = returnRn (return ())
+ = doptRn Opt_D_dump_rn_trace `thenRn` \ dump_rn_trace ->
+ doptRn Opt_D_dump_rn_stats `thenRn` \ dump_rn_stats ->
+ doptRn Opt_D_dump_rn `thenRn` \ dump_rn ->
+ if dump_rn_trace || dump_rn_stats || dump_rn then
+ getRnStats imp_decls `thenRn` \ stats_msg ->
+ returnRn (printErrs stats_msg >>
+ dumpIfSet dump_rn "Renamer:"
+ (vcat (map ppr (local_decls ++ imp_decls))))
+ else
+ returnRn (return ())
\end{code}
getRnStats imported_decls
= getIfacesRn `thenRn` \ ifaces ->
let
- n_mods = length [() | (_, _, Just _) <- eltsFM (iImpModInfo ifaces)]
+ n_mods = length [() | (_, _, True) <- eltsFM (iImpModInfo ifaces)]
- decls_read = [decl | (_, avail, True, (_,decl)) <- nameEnvElts (iDecls ifaces),
+ decls_read = [decl | (avail, True, (_,decl)) <- nameEnvElts (iDecls ifaces),
-- Data, newtype, and class decls are in the decls_fm
-- under multiple names; the tycon/class, and each
-- constructor/class op too.
= vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
ptext SLIT("at ") <+> ppr loc1,
ptext SLIT("and") <+> ppr loc2]
+
+badDeprec d
+ = sep [ptext SLIT("Illegal deprecation when whole module is deprecated"),
+ nest 4 (ppr d)]
\end{code}
+
+
projects / ghc-hetmet.git / blobdiff