rnImports, importsFromLocalDecls,
rnExports,
getLocalDeclBinders, extendRdrEnvRn,
- reportUnusedNames, reportDeprecations
+ reportUnusedNames, finishDeprecations
) where
#include "HsVersions.h"
-import DynFlags ( DynFlag(..), GhcMode(..), DynFlags(..) )
+import DynFlags
import HsSyn ( IE(..), ieName, ImportDecl(..), LImportDecl,
ForeignDecl(..), HsGroup(..), HsValBinds(..),
Sig(..), collectHsBindLocatedBinders, tyClDeclNames,
- instDeclATs, isIdxTyDecl,
+ instDeclATs, isFamInstDecl,
LIE )
import RnEnv
import RnHsDoc ( rnHsDoc )
import IfaceEnv ( ifaceExportNames )
-import LoadIface ( loadSrcInterface )
+import LoadIface ( loadSrcInterface, loadSysInterface )
import TcRnMonad hiding (LIE)
import PrelNames
import Module
import Name
-import NameSet
import NameEnv
-import OccName ( srcDataName, isTcOcc, pprNonVarNameSpace,
- occNameSpace,
- OccEnv, mkOccEnv, lookupOccEnv, emptyOccEnv,
- extendOccEnv )
-import HscTypes ( GenAvailInfo(..), AvailInfo, availNames, availName,
- HomePackageTable, PackageIfaceTable,
- mkPrintUnqualified, availsToNameSet,
- availsToNameEnv,
- Deprecs(..), ModIface(..), Dependencies(..),
- lookupIfaceByModule, ExternalPackageState(..)
- )
-import RdrName ( RdrName, rdrNameOcc, setRdrNameSpace,
- GlobalRdrEnv, mkGlobalRdrEnv, GlobalRdrElt(..),
- emptyGlobalRdrEnv, plusGlobalRdrEnv, globalRdrEnvElts,
- extendGlobalRdrEnv, lookupGlobalRdrEnv, unQualOK, lookupGRE_Name,
- Provenance(..), ImportSpec(..), ImpDeclSpec(..), ImpItemSpec(..),
- importSpecLoc, importSpecModule, isLocalGRE, pprNameProvenance )
+import NameSet
+import OccName
+import HscTypes
+import RdrName
import Outputable
-import UniqFM
import Maybes
-import SrcLoc ( Located(..), mkGeneralSrcSpan, getLoc,
- unLoc, noLoc, srcLocSpan, SrcSpan )
+import SrcLoc
import FiniteMap
import ErrUtils
import BasicTypes ( DeprecTxt )
import DriverPhases ( isHsBoot )
-import Util ( notNull )
-import Data.List ( nub, partition, concatMap )
+import Util
+import ListSetOps
+import Data.List ( partition, concatMap, (\\), delete )
import IO ( openFile, IOMode(..) )
import Monad ( when )
\end{code}
\begin{code}
rnImports :: [LImportDecl RdrName]
- -> RnM ([LImportDecl Name], GlobalRdrEnv, ImportAvails)
+ -> RnM ([LImportDecl Name], GlobalRdrEnv, ImportAvails,AnyHpcUsage)
rnImports imports
-- PROCESS IMPORT DECLS
-- warning for {- SOURCE -} ones that are unnecessary
= do this_mod <- getModule
implicit_prelude <- doptM Opt_ImplicitPrelude
- let all_imports = mk_prel_imports this_mod implicit_prelude ++ imports
- (source, ordinary) = partition is_source_import all_imports
+ let prel_imports = mkPrelImports this_mod implicit_prelude imports
+ (source, ordinary) = partition is_source_import imports
is_source_import (L _ (ImportDecl _ is_boot _ _ _)) = is_boot
- stuff1 <- mapM (rnImportDecl this_mod) ordinary
+ ifOptM Opt_WarnImplicitPrelude (
+ when (notNull prel_imports) $ addWarn (implicitPreludeWarn)
+ )
+
+ stuff1 <- mapM (rnImportDecl this_mod) (prel_imports ++ ordinary)
stuff2 <- mapM (rnImportDecl this_mod) source
- let (decls, rdr_env, avails, imp_avails) = combine (stuff1 ++ stuff2)
- return (decls, rdr_env,
- imp_avails{ imp_parent = availsToNameEnv (nubAvails avails) })
- -- why wait until now to set the imp_parent, rather than
- -- setting it in rnImportDecl for each import, and
- -- combining them with plusImportAvails? The reason is
- -- that we need to combine all the AvailInfos *before*
- -- we build the NameEnv, otherwise the NameEnv can
- -- end up with inconsistencies, eg. the parent can say
- -- C(m1,m2), but the entry for m2 might only say C(m2).
- -- The test mod118 illustrates the bug.
+ let (decls, rdr_env, imp_avails,hpc_usage) = combine (stuff1 ++ stuff2)
+ return (decls, rdr_env, imp_avails,hpc_usage)
+
where
+ combine :: [(LImportDecl Name, GlobalRdrEnv, ImportAvails,AnyHpcUsage)]
+ -> ([LImportDecl Name], GlobalRdrEnv, ImportAvails,AnyHpcUsage)
+ combine = foldr plus ([], emptyGlobalRdrEnv, emptyImportAvails,False)
+ where plus (decl, gbl_env1, imp_avails1,hpc_usage1)
+ (decls, gbl_env2, imp_avails2,hpc_usage2)
+ = (decl:decls,
+ gbl_env1 `plusGlobalRdrEnv` gbl_env2,
+ imp_avails1 `plusImportAvails` imp_avails2,
+ hpc_usage1 || hpc_usage2)
+
+mkPrelImports :: Module -> Bool -> [LImportDecl RdrName] -> [LImportDecl RdrName]
+-- Consruct the implicit declaration "import Prelude" (or not)
+--
-- NB: opt_NoImplicitPrelude is slightly different to import Prelude ();
-- because the former doesn't even look at Prelude.hi for instance
-- declarations, whereas the latter does.
- mk_prel_imports this_mod implicit_prelude
- | this_mod == pRELUDE
- || explicit_prelude_import
- || not implicit_prelude
- = []
- | otherwise = [preludeImportDecl]
- explicit_prelude_import
- = notNull [ () | L _ (ImportDecl mod _ _ _ _) <- imports,
+mkPrelImports this_mod implicit_prelude import_decls
+ | this_mod == pRELUDE
+ || explicit_prelude_import
+ || not implicit_prelude
+ = []
+ | otherwise = [preludeImportDecl]
+ where
+ explicit_prelude_import
+ = notNull [ () | L _ (ImportDecl mod _ _ _ _) <- import_decls,
unLoc mod == pRELUDE_NAME ]
- combine :: [(LImportDecl Name, GlobalRdrEnv, [AvailInfo], ImportAvails)]
- -> ([LImportDecl Name], GlobalRdrEnv, [AvailInfo], ImportAvails)
- combine = foldr plus ([], emptyGlobalRdrEnv, [], emptyImportAvails)
- where plus (decl, gbl_env1, avails1, imp_avails1)
- (decls, gbl_env2, avails2, imp_avails2)
- = (decl:decls,
- gbl_env1 `plusGlobalRdrEnv` gbl_env2,
- avails1 ++ avails2,
- imp_avails1 `plusImportAvails` imp_avails2)
-
-preludeImportDecl :: LImportDecl RdrName
-preludeImportDecl
- = L loc $
- ImportDecl (L loc pRELUDE_NAME)
+ preludeImportDecl :: LImportDecl RdrName
+ preludeImportDecl
+ = L loc $
+ ImportDecl (L loc pRELUDE_NAME)
False {- Not a boot interface -}
False {- Not qualified -}
Nothing {- No "as" -}
Nothing {- No import list -}
- where
- loc = mkGeneralSrcSpan FSLIT("Implicit import declaration")
-
+ loc = mkGeneralSrcSpan FSLIT("Implicit import declaration")
+
rnImportDecl :: Module
-> LImportDecl RdrName
- -> RnM (LImportDecl Name, GlobalRdrEnv,
- [AvailInfo], ImportAvails)
+ -> RnM (LImportDecl Name, GlobalRdrEnv, ImportAvails,AnyHpcUsage)
rnImportDecl this_mod (L loc (ImportDecl loc_imp_mod_name want_boot
qual_only as_mod imp_details))
let
imp_mod = mi_module iface
deprecs = mi_deprecs iface
- is_orph = mi_orphan iface
+ orph_iface = mi_orphan iface
has_finsts = mi_finsts iface
deps = mi_deps iface
total_avails <- ifaceExportNames filtered_exports
-- filter the imports according to the import declaration
- (new_imp_details, filtered_avails, gbl_env) <-
+ (new_imp_details, gbl_env) <-
filterImports iface imp_spec imp_details total_avails
dflags <- getDOpts
let
-- Compute new transitive dependencies
- orphans | is_orph = ASSERT( not (imp_mod `elem` dep_orphs deps) )
- imp_mod : dep_orphs deps
- | otherwise = dep_orphs deps
+ orphans | orph_iface = ASSERT( not (imp_mod `elem` dep_orphs deps) )
+ imp_mod : dep_orphs deps
+ | otherwise = dep_orphs deps
finsts | has_finsts = ASSERT( not (imp_mod `elem` dep_finsts deps) )
imp_mod : dep_finsts deps
other -> False
imports = ImportAvails {
- imp_env = unitUFM qual_mod_name filtered_avails,
imp_mods = unitModuleEnv imp_mod (imp_mod, import_all, loc),
imp_orphs = orphans,
imp_finsts = finsts,
imp_dep_mods = mkModDeps dependent_mods,
- imp_dep_pkgs = dependent_pkgs,
- imp_parent = emptyNameEnv
+ imp_dep_pkgs = dependent_pkgs
}
- -- in
-
-- Complain if we import a deprecated module
ifOptM Opt_WarnDeprecations (
case deprecs of
let new_imp_decl = L loc (ImportDecl loc_imp_mod_name want_boot
qual_only as_mod new_imp_details)
- returnM (new_imp_decl, gbl_env, filtered_avails, imports)
+ returnM (new_imp_decl, gbl_env, imports, mi_hpc iface)
)
warnRedundantSourceImport mod_name
; avails <- getLocalDeclBinders gbl_env group
- ; implicit_prelude <- doptM Opt_ImplicitPrelude
- ; let {
- -- Optimisation: filter out names for built-in syntax
- -- They just clutter up the environment (esp tuples), and the parser
- -- will generate Exact RdrNames for them, so the cluttered
- -- envt is no use. To avoid doing this filter all the time,
- -- we use -fno-implicit-prelude as a clue that the filter is
- -- worth while. Really, it's only useful for GHC.Base and GHC.Tuple.
- --
- -- It's worth doing because it makes the environment smaller for
- -- every module that imports the Prelude
- --
- -- Note: don't filter the gbl_env (hence all_names, not filered_all_names
- -- in defn of gres above). Stupid reason: when parsing
- -- data type decls, the constructors start as Exact tycon-names,
- -- and then get turned into data con names by zapping the name space;
- -- but that stops them being Exact, so they get looked up.
- -- Ditto in fixity decls; e.g. infix 5 :
- -- Sigh. It doesn't matter because it only affects the Data.Tuple really.
- -- The important thing is to trim down the exports.
- names = concatMap availNames avails;
-
- filtered_avails
- | implicit_prelude = avails
- | otherwise = filterAvails (not.isBuiltInSyntax) avails;
-
- ; this_mod = tcg_mod gbl_env
- ; imports = emptyImportAvails {
- imp_env = unitUFM (moduleName this_mod)
- filtered_avails,
- imp_parent = availsToNameEnv avails
- }
- }
-
- ; rdr_env' <- extendRdrEnvRn (tcg_rdr_env gbl_env) names
+ ; rdr_env' <- extendRdrEnvRn (tcg_rdr_env gbl_env) avails
; traceRn (text "local avails: " <> ppr avails)
- ; returnM (gbl_env { tcg_rdr_env = rdr_env',
- tcg_imports = imports `plusImportAvails` tcg_imports gbl_env })
+ ; returnM (gbl_env { tcg_rdr_env = rdr_env' })
}
-extendRdrEnvRn :: GlobalRdrEnv -> [Name] -> RnM GlobalRdrEnv
+extendRdrEnvRn :: GlobalRdrEnv -> [AvailInfo] -> RnM GlobalRdrEnv
-- Add the new locally-bound names one by one, checking for duplicates as
-- we do so. Remember that in Template Haskell the duplicates
-- might *already be* in the GlobalRdrEnv from higher up the module
-extendRdrEnvRn rdr_env names
- = foldlM add_local rdr_env names
+extendRdrEnvRn rdr_env avails
+ = foldlM add_local rdr_env (gresFromAvails LocalDef avails)
where
- add_local rdr_env name
- | gres <- lookupGlobalRdrEnv rdr_env (nameOccName name)
+ add_local rdr_env gre
+ | gres <- lookupGlobalRdrEnv rdr_env (nameOccName (gre_name gre))
, (dup_gre:_) <- filter isLocalGRE gres -- Check for existing *local* defns
- = do { addDupDeclErr (gre_name dup_gre) name
+ = do { addDupDeclErr (gre_name dup_gre) (gre_name gre)
; return rdr_env }
| otherwise
- = return (extendGlobalRdrEnv rdr_env new_gre)
- where
- new_gre = GRE {gre_name = name, gre_prov = LocalDef}
+ = return (extendGlobalRdrEnv rdr_env gre)
\end{code}
@getLocalDeclBinders@ returns the names for an @HsDecl@. It's
*** See "THE NAMING STORY" in HsDecls ****
-Instances of indexed types
+Instances of type families
~~~~~~~~~~~~~~~~~~~~~~~~~~
Indexed data/newtype instances contain data constructors that we need to
collect, too. Moreover, we need to descend into the data/newtypes instances
for_hs_bndrs = [nm | L _ (ForeignImport nm _ _) <- foreign_decls]
new_tc tc_decl
- | isIdxTyDecl (unLoc tc_decl)
+ | isFamInstDecl (unLoc tc_decl)
= do { main_name <- lookupFamInstDeclBndr mod main_rdr
; sub_names <- mappM (newTopSrcBinder mod) sub_rdrs
; return (AvailTC main_name sub_names) }
inst_ats inst_decl
= mappM new_tc (instDeclATs (unLoc inst_decl))
+
+getLocalDeclBinders _ _ = panic "getLocalDeclBinders" -- ValBindsOut can't happen
\end{code}
-> Maybe (Bool, [LIE RdrName]) -- Import spec; True => hiding
-> [AvailInfo] -- What's available
-> RnM (Maybe (Bool, [LIE Name]), -- Import spec w/ Names
- [AvailInfo], -- What's imported
GlobalRdrEnv) -- Same again, but in GRE form
filterImports iface decl_spec Nothing all_avails
- = return (Nothing, all_avails, mkGenericRdrEnv decl_spec all_avails)
+ = return (Nothing, mkGlobalRdrEnv (gresFromAvails prov all_avails))
+ where
+ prov = Imported [ImpSpec { is_decl = decl_spec, is_item = ImpAll }]
+
filterImports iface decl_spec (Just (want_hiding, import_items)) all_avails
- = do
- -- check for errors, convert RdrNames to Names
- opt_indexedtypes <- doptM Opt_IndexedTypes
- items1 <- mapM (lookup_lie opt_indexedtypes) import_items
-
- let -- build the AvailInfo corresponding to each import item.
- items2 = [ (ie, filterAvailByIE (unLoc ie) av)
- | (ie,av) <- concat items1 ]
-
- -- eliminate duplicates
- avails = nubAvails (map snd items2)
-
- -- the new import spec, with Names instead of RdrNames
- imp_spec_out = Just (want_hiding, map fst items2)
-
- case want_hiding of
- True ->
- let
- keep n = not (n `elemNameSet` availsToNameSet avails)
- pruned_avails = filterAvails keep all_avails
- in do
- traceRn (text "pruned_avails: " <> ppr pruned_avails)
- return (imp_spec_out, pruned_avails,
- mkGenericRdrEnv decl_spec pruned_avails)
-
- False ->
- let
- gres = concat [ mkGlobalRdrEltsFromIE decl_spec lie avail
- | (lie, avail) <- items2 ]
- in do
- traceRn (text "imported avails: " <> ppr avails)
- return (imp_spec_out, avails, mkGlobalRdrEnv gres)
+ = do -- check for errors, convert RdrNames to Names
+ opt_typeFamilies <- doptM Opt_TypeFamilies
+ items1 <- mapM (lookup_lie opt_typeFamilies) import_items
+
+ let items2 :: [(LIE Name, AvailInfo)]
+ items2 = concat items1
+ -- NB the AvailInfo may have duplicates, and several items
+ -- for the same parent; e.g N(x) and N(y)
+
+ names = availsToNameSet (map snd items2)
+ keep n = not (n `elemNameSet` names)
+ pruned_avails = filterAvails keep all_avails
+ hiding_prov = Imported [ImpSpec { is_decl = decl_spec, is_item = ImpAll }]
+
+ gres | want_hiding = gresFromAvails hiding_prov pruned_avails
+ | otherwise = concatMap (gresFromIE decl_spec) items2
+
+ return (Just (want_hiding, map fst items2), mkGlobalRdrEnv gres)
where
-- This environment is how we map names mentioned in the import
- -- list to the actual Name they correspond to, and the family
- -- that the Name belongs to (an AvailInfo).
+ -- list to the actual Name they correspond to, and the name family
+ -- that the Name belongs to (the AvailInfo). The situation is
+ -- complicated by associated families, which introduce a three-level
+ -- hierachy, where class = grand parent, assoc family = parent, and
+ -- data constructors = children. The occ_env entries for associated
+ -- families needs to capture all this information; hence, we have the
+ -- third component of the environment that gives the class name (=
+ -- grand parent) in case of associated families.
--
-- This env will have entries for data constructors too,
-- they won't make any difference because naked entities like T
-- in an import list map to TcOccs, not VarOccs.
- occ_env :: OccEnv (Name,AvailInfo)
- occ_env = mkOccEnv [ (nameOccName n, (n,a))
- | a <- all_avails, n <- availNames a ]
+ occ_env :: OccEnv (Name, -- the name
+ AvailInfo, -- the export item providing the name
+ Maybe Name) -- the parent of associated types
+ occ_env = mkOccEnv_C combine [ (nameOccName n, (n, a, Nothing))
+ | a <- all_avails, n <- availNames a]
+ where
+ -- we know that (1) there are at most entries for one name, (2) their
+ -- first component is identical, (3) they are for tys/cls, and (4) one
+ -- entry has the name in its parent position (the other doesn't)
+ combine (name, AvailTC p1 subs1, Nothing)
+ (_ , AvailTC p2 subs2, Nothing)
+ = let
+ (parent, subs) = if p1 == name then (p2, subs1) else (p1, subs2)
+ in
+ (name, AvailTC name subs, Just parent)
lookup_lie :: Bool -> LIE RdrName -> TcRn [(LIE Name, AvailInfo)]
- lookup_lie opt_indexedtypes (L loc ieRdr)
+ lookup_lie opt_typeFamilies (L loc ieRdr)
= do
stuff <- setSrcSpan loc $
- case lookup_ie opt_indexedtypes ieRdr of
+ case lookup_ie opt_typeFamilies ieRdr of
Failed err -> addErr err >> return []
Succeeded a -> return a
checkDodgyImport stuff
return [ (L loc ie, avail) | (ie,avail) <- stuff ]
where
- -- warn when importing T(..) if T was exported absgtractly
+ -- Warn when importing T(..) if T was exported abstractly
checkDodgyImport stuff
| IEThingAll n <- ieRdr, (_, AvailTC _ [one]):_ <- stuff
= ifOptM Opt_WarnDodgyImports (addWarn (dodgyImportWarn n))
-- Returns Nothing on error.
-- We return a list here, because in the case of an import
-- item like C, if we are hiding, then C refers to *both* a
- -- type/class and a data constructor.
+ -- type/class and a data constructor. Moreover, when we import
+ -- data constructors of an associated family, we need separate
+ -- AvailInfos for the data constructors and the family (as they have
+ -- different parents). See the discussion at occ_env.
lookup_ie :: Bool -> IE RdrName -> MaybeErr Message [(IE Name,AvailInfo)]
- lookup_ie opt_indexedtypes ie
+ lookup_ie opt_typeFamilies ie
= let bad_ie = Failed (badImportItemErr iface decl_spec ie)
lookup_name rdrName =
in
case ie of
IEVar n -> do
- (name,avail) <- lookup_name n
- return [(IEVar name, avail)]
+ (name, avail, _) <- lookup_name n
+ return [(IEVar name, trimAvail avail name)]
IEThingAll tc -> do
- (name,avail) <- lookup_name tc
- return [(IEThingAll name, avail)]
+ (name, avail@(AvailTC name2 subs), mb_parent) <- lookup_name tc
+ case mb_parent of
+ -- non-associated ty/cls
+ Nothing -> return [(IEThingAll name, avail)]
+ -- associated ty
+ Just parent -> return [(IEThingAll name,
+ AvailTC name2 (subs \\ [name])),
+ (IEThingAll name, AvailTC parent [name])]
IEThingAbs tc
| want_hiding -- hiding ( C )
in
case catMaybeErr [ tc_name, dc_name ] of
[] -> bad_ie
- names -> return [ (IEThingAbs n, av) | (n,av) <- names ]
+ names -> return [mkIEThingAbs name | name <- names]
| otherwise
- -> do (name,avail) <- lookup_name tc
- return [(IEThingAbs name, avail)]
-
- IEThingWith n ns -> do
- (name,avail) <- lookup_name n
- case avail of
- AvailTC nm subnames | nm == name -> do
- let env = mkOccEnv [ (nameOccName s, s)
- | s <- subnames ]
- let mb_children = map (lookupOccEnv env . rdrNameOcc) ns
- children <-
- if any isNothing mb_children
- then bad_ie
- else return (catMaybes mb_children)
- -- check for proper import of indexed types
- when (not opt_indexedtypes && any isTyConName children) $
- Failed (typeItemErr (head . filter isTyConName
- $ children )
- (text "in import list"))
- return [(IEThingWith name children, avail)]
- _otherwise -> bad_ie
+ -> do nameAvail <- lookup_name tc
+ return [mkIEThingAbs nameAvail]
+
+ IEThingWith tc ns -> do
+ (name, AvailTC name2 subnames, mb_parent) <- lookup_name tc
+ let
+ env = mkOccEnv [(nameOccName s, s) | s <- subnames]
+ mb_children = map (lookupOccEnv env . rdrNameOcc) ns
+ children <- if any isNothing mb_children
+ then bad_ie
+ else return (catMaybes mb_children)
+ -- check for proper import of type families
+ when (not opt_typeFamilies && any isTyConName children) $
+ Failed (typeItemErr (head . filter isTyConName $ children)
+ (text "in import list"))
+ case mb_parent of
+ -- non-associated ty/cls
+ Nothing -> return [(IEThingWith name children,
+ AvailTC name (name:children))]
+ -- associated ty
+ Just parent -> return [(IEThingWith name children,
+ AvailTC name children),
+ (IEThingWith name children,
+ AvailTC parent [name])]
_other -> Failed illegalImportItemErr
-- could be IEModuleContents, IEGroup, IEDoc, IEDocNamed
-- all errors.
+ where
+ mkIEThingAbs (n, av, Nothing ) = (IEThingAbs n, trimAvail av n)
+ mkIEThingAbs (n, av, Just parent) = (IEThingAbs n, AvailTC parent [n])
+
+
catMaybeErr :: [MaybeErr err a] -> [a]
catMaybeErr ms = [ a | Succeeded a <- ms ]
\end{code}
-- | make a 'GlobalRdrEnv' where all the elements point to the same
-- import declaration (useful for "hiding" imports, or imports with
-- no details).
-mkGenericRdrEnv decl_spec avails
- = mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = Imported [imp_spec] }
- | name <- concatMap availNames avails ]
- where
- imp_spec = ImpSpec { is_decl = decl_spec, is_item = ImpAll }
-
-
--- | filters an 'AvailInfo' by the given import/export spec.
-filterAvailByIE :: IE Name -> AvailInfo -> AvailInfo
-filterAvailByIE (IEVar n) a@(Avail _) = a
-filterAvailByIE (IEVar n) a@(AvailTC tc subs) = AvailTC tc [n]
-filterAvailByIE (IEThingAbs n) a@(AvailTC _ _) = AvailTC n [n]
-filterAvailByIE (IEThingAll n) a@(AvailTC tc subs) = a
-filterAvailByIE (IEThingWith n ns) a@(AvailTC tc subs) =
- AvailTC tc (filter (`elem` (n:ns)) subs)
-filterAvailByIE _ _ = panic "filterAvailByIE"
+gresFromAvails :: Provenance -> [AvailInfo] -> [GlobalRdrElt]
+gresFromAvails prov avails
+ = concatMap (gresFromAvail (const prov)) avails
+
+gresFromAvail :: (Name -> Provenance) -> AvailInfo -> [GlobalRdrElt]
+gresFromAvail prov_fn avail
+ = [ GRE {gre_name = n,
+ gre_par = availParent n avail,
+ gre_prov = prov_fn n}
+ | n <- availNames avail ]
+
+greAvail :: GlobalRdrElt -> AvailInfo
+greAvail gre = mkUnitAvail (gre_name gre) (gre_par gre)
+
+mkUnitAvail :: Name -> Parent -> AvailInfo
+mkUnitAvail me (ParentIs p) = AvailTC p [me]
+mkUnitAvail me NoParent | isTyConName me = AvailTC me [me]
+ | otherwise = Avail me
+
+plusAvail (Avail n1) (Avail n2) = Avail n1
+plusAvail (AvailTC n1 ns1) (AvailTC n2 ns2) = AvailTC n2 (ns1 `unionLists` ns2)
+plusAvail a1 a2 = pprPanic "RnEnv.plusAvail" (hsep [ppr a1,ppr a2])
+
+availParent :: Name -> AvailInfo -> Parent
+availParent n (Avail _) = NoParent
+availParent n (AvailTC m ms) | n==m = NoParent
+ | otherwise = ParentIs m
+
+trimAvail :: AvailInfo -> Name -> AvailInfo
+trimAvail (Avail n) m = Avail n
+trimAvail (AvailTC n ns) m = ASSERT( m `elem` ns) AvailTC n [m]
-- | filters 'AvailInfo's by the given predicate
filterAvails :: (Name -> Bool) -> [AvailInfo] -> [AvailInfo]
let left = filter keep ns in
if null left then rest else AvailTC tc left : rest
--- | combines 'AvailInfo's from the same family
-nubAvails :: [AvailInfo] -> [AvailInfo]
-nubAvails avails = nameEnvElts (foldr add emptyNameEnv avails)
- where
- add avail env = extendNameEnv_C comb_avails env (availName avail) avail
- comb_avails (AvailTC tc subs1) (AvailTC _ subs2)
- = AvailTC tc (nub (subs1 ++ subs2))
- comb_avails avail _ = avail
-
-- | Given an import/export spec, construct the appropriate 'GlobalRdrElt's.
-mkGlobalRdrEltsFromIE :: ImpDeclSpec -> LIE Name -> AvailInfo -> [GlobalRdrElt]
-mkGlobalRdrEltsFromIE decl_spec (L loc ie) avail =
- case ie of
- IEVar name ->
- [mk_explicit_gre name]
- IEThingAbs name ->
- [mk_explicit_gre name]
- IEThingAll name | AvailTC _ subs <- avail ->
- mk_explicit_gre name : map mk_implicit_gre subs
- IEThingWith name subs ->
- mk_explicit_gre name : map mk_explicit_gre subs
- _ ->
- panic "mkGlobalRdrEltsFromIE"
+gresFromIE :: ImpDeclSpec -> (LIE Name, AvailInfo) -> [GlobalRdrElt]
+gresFromIE decl_spec (L loc ie, avail)
+ = gresFromAvail prov_fn avail
where
- mk_explicit_gre = mk_gre True
- mk_implicit_gre = mk_gre False
-
- mk_gre explicit name = GRE { gre_name = name,
- gre_prov = Imported [imp_spec] }
- where
- imp_spec = ImpSpec { is_decl = decl_spec, is_item = item_spec }
- item_spec = ImpSome { is_explicit = explicit, is_iloc = loc }
+ is_explicit = case ie of
+ IEThingAll name -> \n -> n==name
+ other -> \n -> True
+ prov_fn name = Imported [imp_spec]
+ where
+ imp_spec = ImpSpec { is_decl = decl_spec, is_item = item_spec }
+ item_spec = ImpSome { is_explicit = is_explicit name, is_iloc = loc }
+
+mkChildEnv :: [GlobalRdrElt] -> NameEnv [Name]
+mkChildEnv gres = foldr add emptyNameEnv gres
+ where
+ add (GRE { gre_name = n, gre_par = ParentIs p }) env = extendNameEnv_C (++) env p [n]
+ add other_gre env = env
+
+findChildren :: NameEnv [Name] -> Name -> [Name]
+findChildren env n = lookupNameEnv env n `orElse` []
+\end{code}
+
+---------------------------------------
+ AvailEnv and friends
+
+All this AvailEnv stuff is hardly used; only in a very small
+part of RnNames. Todo: remove?
+---------------------------------------
+
+\begin{code}
+type AvailEnv = NameEnv AvailInfo -- Maps a Name to the AvailInfo that contains it
+
+emptyAvailEnv :: AvailEnv
+emptyAvailEnv = emptyNameEnv
+
+unitAvailEnv :: AvailInfo -> AvailEnv
+unitAvailEnv a = unitNameEnv (availName a) a
+
+plusAvailEnv :: AvailEnv -> AvailEnv -> AvailEnv
+plusAvailEnv = plusNameEnv_C plusAvail
+
+availEnvElts :: AvailEnv -> [AvailInfo]
+availEnvElts = nameEnvElts
+
+addAvail :: AvailEnv -> AvailInfo -> AvailEnv
+addAvail avails avail = extendNameEnv_C plusAvail avails (availName avail) avail
+
+mkAvailEnv :: [AvailInfo] -> AvailEnv
+ -- 'avails' may have several items with the same availName
+ -- E.g import Ix( Ix(..), index )
+ -- will give Ix(Ix,index,range) and Ix(index)
+ -- We want to combine these; addAvail does that
+mkAvailEnv avails = foldl addAvail emptyAvailEnv avails
+
+-- After combining the avails, we need to ensure that the parent name is the
+-- first entry in the list of subnames, if it is included at all. (Subsequent
+-- functions rely on that.)
+normaliseAvail :: AvailInfo -> AvailInfo
+normaliseAvail avail@(Avail _) = avail
+normaliseAvail (AvailTC name subs) = AvailTC name subs'
+ where
+ subs' = if name `elem` subs then name : (delete name subs) else subs
+
+-- | combines 'AvailInfo's from the same family
+nubAvails :: [AvailInfo] -> [AvailInfo]
+nubAvails avails = map normaliseAvail . nameEnvElts . mkAvailEnv $ avails
\end{code}
\begin{code}
type ExportAccum -- The type of the accumulating parameter of
-- the main worker function in rnExports
- = ([LIE Name], -- export items with Names
+ = ([LIE Name], -- Export items with Names
ExportOccMap, -- Tracks exported occurrence names
[AvailInfo]) -- The accumulated exported stuff
+ -- Not nub'd!
+
emptyExportAccum = ([], emptyOccEnv, [])
type ExportOccMap = OccEnv (Name, IE RdrName)
-- it came from. It's illegal to export two distinct things
-- that have the same occurrence name
-rnExports :: Bool -- False => no 'module M(..) where' header at all
+rnExports :: Bool -- False => no 'module M(..) where' header at all
-> Maybe [LIE RdrName] -- Nothing => no explicit export list
- -> RnM (Maybe [LIE Name], [AvailInfo])
+ -> TcGblEnv
+ -> RnM TcGblEnv
-- Complains if two distinct exports have same OccName
-- Warns about identical exports.
-- Complains about exports items not in scope
-rnExports explicit_mod exports
- = do TcGblEnv { tcg_mod = this_mod,
- tcg_rdr_env = rdr_env,
- tcg_imports = imports } <- getGblEnv
-
+rnExports explicit_mod exports
+ tcg_env@(TcGblEnv { tcg_mod = this_mod,
+ tcg_rdr_env = rdr_env,
+ tcg_imports = imports })
+ = do {
-- If the module header is omitted altogether, then behave
-- as if the user had written "module Main(main) where..."
-- EXCEPT in interactive mode, when we behave as if he had
-- written "module Main where ..."
-- Reason: don't want to complain about 'main' not in scope
-- in interactive mode
- ghc_mode <- getGhcMode
- real_exports <-
- case () of
- () | explicit_mod
- -> return exports
- | ghc_mode == Interactive
- -> return Nothing
- | otherwise
- -> do mainName <- lookupGlobalOccRn main_RDR_Unqual
- return (Just ([noLoc (IEVar main_RDR_Unqual)]))
- -- ToDo: the 'noLoc' here is unhelpful if 'main' turns
- -- out to be out of scope
-
- (exp_spec, avails) <- exports_from_avail real_exports rdr_env
- imports this_mod
- return (exp_spec, nubAvails avails)
- -- combine families
+ ; dflags <- getDOpts
+ ; let real_exports
+ | explicit_mod = exports
+ | ghcLink dflags == LinkInMemory = Nothing
+ | otherwise = Just ([noLoc (IEVar main_RDR_Unqual)])
+ -- ToDo: the 'noLoc' here is unhelpful if 'main'
+ -- turns out to be out of scope
+
+ ; (rn_exports, avails) <- exports_from_avail real_exports rdr_env imports this_mod
+ ; let final_avails = nubAvails avails -- Combine families
+
+ ; return (tcg_env { tcg_exports = final_avails,
+ tcg_rn_exports = case tcg_rn_exports tcg_env of
+ Nothing -> Nothing
+ Just _ -> rn_exports,
+ tcg_dus = tcg_dus tcg_env `plusDU`
+ usesOnly (availsToNameSet final_avails) }) }
+
exports_from_avail :: Maybe [LIE RdrName]
-- Nothing => no explicit export list
-> RnM (Maybe [LIE Name], [AvailInfo])
exports_from_avail Nothing rdr_env imports this_mod
- = -- the same as (module M) where M is the current module name,
+ = -- The same as (module M) where M is the current module name,
-- so that's how we handle it.
let
- names = [ gre_name gre | gre <- globalRdrEnvElts rdr_env,
+ avails = [ greAvail gre | gre <- globalRdrEnvElts rdr_env,
isLocalGRE gre ]
- avails = map (lookupNameEnv_NF (imp_parent imports)) names
in
return (Nothing, avails)
exports_from_avail (Just rdr_items) rdr_env imports this_mod
- = do traceRn (text "parent: " <> ppr (imp_parent imports))
- (ie_names, _, exports) <- foldlM do_litem emptyExportAccum rdr_items
+ = do (ie_names, _, exports) <- foldlM do_litem emptyExportAccum rdr_items
+
return (Just ie_names, exports)
where
do_litem :: ExportAccum -> LIE RdrName -> RnM ExportAccum
do_litem acc lie = setSrcSpan (getLoc lie) (exports_from_item acc lie)
+ kids_env :: NameEnv [Name] -- Maps a parent to its in-scope children
+ kids_env = mkChildEnv (globalRdrEnvElts rdr_env)
+
exports_from_item :: ExportAccum -> LIE RdrName -> RnM ExportAccum
exports_from_item acc@(ie_names, occs, exports)
- (L loc ie@(IEModuleContents mod))
- | mod `elem` mods -- Duplicate export of M
+ (L loc ie@(IEModuleContents mod))
+ | let earlier_mods = [ mod | (L _ (IEModuleContents mod)) <- ie_names ]
+ , mod `elem` earlier_mods -- Duplicate export of M
= do { warn_dup_exports <- doptM Opt_WarnDuplicateExports ;
warnIf warn_dup_exports (dupModuleExport mod) ;
returnM acc }
| otherwise
- = case lookupUFM (imp_env imports) mod of
- Nothing -> do addErr (modExportErr mod)
- return acc
- Just avails
- -> do traceRn (text "mod avails: " <> ppr mod <+> ppr avails)
- let avails' = filterAvails (inScopeUnqual rdr_env) $
- nubAvails avails
- new_exps = concatMap availNames avails'
-
- occs' <- check_occs ie occs new_exps
+ = do { implicit_prelude <- doptM Opt_ImplicitPrelude
+ ; let gres = filter (isModuleExported implicit_prelude mod)
+ (globalRdrEnvElts rdr_env)
+
+ ; warnIf (null gres) (nullModuleExport mod)
+
+ ; occs' <- check_occs ie occs (map gre_name gres)
-- This check_occs not only finds conflicts
-- between this item and others, but also
-- internally within this item. That is, if
-- 'M.x' is in scope in several ways, we'll have
-- several members of mod_avails with the same
-- OccName.
- return (L loc (IEModuleContents mod) : ie_names,
- occs', avails' ++ exports)
- where
- mods = [ mod | (L _ (IEModuleContents mod)) <- ie_names ]
+ ; return (L loc (IEModuleContents mod) : ie_names,
+ occs', map greAvail gres ++ exports) }
exports_from_item acc@(lie_names, occs, exports) (L loc ie)
- = do new_ie <- lookup_ie ie
- let ie_name = ieName new_ie
- if isUnboundName ie_name
+ | isDoc ie
+ = do new_ie <- lookup_doc_ie ie
+ return (L loc new_ie : lie_names, occs, exports)
+
+ | otherwise
+ = do (new_ie, avail) <- lookup_ie ie
+ if isUnboundName (ieName new_ie)
then return acc -- Avoid error cascade
else do
- if isDoc new_ie -- deal with docs
- then return (L loc new_ie : lie_names, occs, exports)
- else do
- traceRn (text "lookup_avail: " <> ppr (lookup_avail ie_name))
- let avail = filterAvailByIE new_ie (lookup_avail ie_name)
- new_exports = case new_ie of
- IEThingWith n ns -> n : ns
- _ -> availNames avail
- -- ^^^ an IEThingWith might contain duplicates
- -- whereas the avail doesn't, but we want
- -- duplicates to be noticed by check_occs below.
- -- checkErr (not (null (drop 1 new_exports))) (exportItemErr ie)
- checkForDodgyExport new_ie new_exports
- occs' <- check_occs ie occs new_exports
- return (L loc new_ie : lie_names, occs', avail : exports)
-
- lookup_avail :: Name -> AvailInfo
- lookup_avail name =
- case lookupNameEnv avail_env name of
- Nothing -> pprPanic "rnExports:lookup_avail" (ppr name)
- Just a -> a
- where avail_env = imp_parent imports
- lookup_ie :: IE RdrName -> RnM (IE Name)
+ occs' <- check_occs ie occs (availNames avail)
+ return (L loc new_ie : lie_names, occs', avail : exports)
+
+ -------------
+ lookup_ie :: IE RdrName -> RnM (IE Name, AvailInfo)
lookup_ie (IEVar rdr)
- = do name <- lookupGlobalOccRn rdr
- return (IEVar name)
+ = do gre <- lookupGreRn rdr
+ return (IEVar (gre_name gre), greAvail gre)
lookup_ie (IEThingAbs rdr)
+ = do gre <- lookupGreRn rdr
+ let name = gre_name gre
+ case gre_par gre of
+ NoParent -> return (IEThingAbs name,
+ AvailTC name [name])
+ ParentIs p -> return (IEThingAbs name,
+ AvailTC p [name])
+
+ lookup_ie ie@(IEThingAll rdr)
= do name <- lookupGlobalOccRn rdr
- return (IEThingAbs name)
-
- lookup_ie (IEThingAll rdr)
- = do name <- lookupGlobalOccRn rdr
- return (IEThingAll name)
+ let kids = findChildren kids_env name
+ when (null kids)
+ (if (isTyConName name) then addWarn (dodgyExportWarn name)
+ -- This occurs when you export T(..), but
+ -- only import T abstractly, or T is a synonym.
+ else addErr (exportItemErr ie))
+
+ return (IEThingAll name, AvailTC name (name:kids))
lookup_ie ie@(IEThingWith rdr sub_rdrs)
= do name <- lookupGlobalOccRn rdr
if isUnboundName name
- then return (IEThingWith name [])
+ then return (IEThingWith name [], AvailTC name [name])
else do
- let avail = lookup_avail name
- env = mkOccEnv [ (nameOccName s, s)
- | AvailTC _ subnames <- [avail],
- s <- subnames ]
- let mb_names = map (lookupOccEnv env . rdrNameOcc) sub_rdrs
+ let env = mkOccEnv [ (nameOccName s, s)
+ | s <- findChildren kids_env name ]
+ mb_names = map (lookupOccEnv env . rdrNameOcc) sub_rdrs
if any isNothing mb_names
then do addErr (exportItemErr ie)
- return (IEThingWith name [])
+ return (IEThingWith name [], AvailTC name [name])
else do let names = catMaybes mb_names
- optIdxTypes <- doptM Opt_IndexedTypes
- when (not optIdxTypes && any isTyConName names) $
+ optTyFam <- doptM Opt_TypeFamilies
+ when (not optTyFam && any isTyConName names) $
addErr (typeItemErr ( head
. filter isTyConName
$ names )
(text "in export list"))
- return (IEThingWith name (catMaybes mb_names))
+ return (IEThingWith name names, AvailTC name (name:names))
- lookup_ie (IEGroup lev doc)
- = do rn_doc <- rnHsDoc doc
- return (IEGroup lev rn_doc)
- lookup_ie (IEDoc doc)
- = do rn_doc <- rnHsDoc doc
- return (IEDoc rn_doc)
- lookup_ie (IEDocNamed str)
- = return (IEDocNamed str)
+ lookup_ie ie = panic "lookup_ie" -- Other cases covered earlier
- lookup_ie (IEModuleContents _)
- = panic "rnExports:lookup_ie" -- caught earlier
+ -------------
+ lookup_doc_ie :: IE RdrName -> RnM (IE Name)
+ lookup_doc_ie (IEGroup lev doc) = do rn_doc <- rnHsDoc doc
+ return (IEGroup lev rn_doc)
+ lookup_doc_ie (IEDoc doc) = do rn_doc <- rnHsDoc doc
+ return (IEDoc rn_doc)
+ lookup_doc_ie (IEDocNamed str) = return (IEDocNamed str)
+ lookup_doc_ie ie = panic "lookup_doc_ie" -- Other cases covered earlier
isDoc (IEDoc _) = True
isDoc _ = False
-------------------------------
-inScopeUnqual :: GlobalRdrEnv -> Name -> Bool
--- Checks whether the Name is in scope unqualified,
--- regardless of whether it's ambiguous or not
-inScopeUnqual env n = any unQualOK (lookupGRE_Name env n)
-
--------------------------------
-checkForDodgyExport :: IE Name -> [Name] -> RnM ()
-checkForDodgyExport ie@(IEThingAll tc) [n]
- | isTcOcc (nameOccName n) = addWarn (dodgyExportWarn tc)
- -- This occurs when you export T(..), but
- -- only import T abstractly, or T is a synonym.
- -- The single [n] is the type or class itself
- | otherwise = addErr (exportItemErr ie)
- -- This happes if you export x(..), which is bogus
-checkForDodgyExport _ _ = return ()
+isModuleExported :: Bool -> ModuleName -> GlobalRdrElt -> Bool
+-- True if the thing is in scope *both* unqualified, *and* with qualifier M
+isModuleExported implicit_prelude mod (GRE { gre_name = name, gre_prov = prov })
+ | implicit_prelude && isBuiltInSyntax name = False
+ -- Optimisation: filter out names for built-in syntax
+ -- They just clutter up the environment (esp tuples), and the parser
+ -- will generate Exact RdrNames for them, so the cluttered
+ -- envt is no use. To avoid doing this filter all the time,
+ -- we use -fno-implicit-prelude as a clue that the filter is
+ -- worth while. Really, it's only useful for GHC.Base and GHC.Tuple.
+ --
+ -- It's worth doing because it makes the environment smaller for
+ -- every module that imports the Prelude
+ | otherwise
+ = case prov of
+ LocalDef -> moduleName (nameModule name) == mod
+ Imported is -> any unQualSpecOK is && any (qualSpecOK mod) is
-------------------------------
check_occs :: IE RdrName -> ExportOccMap -> [Name] -> RnM ExportOccMap
%*********************************************************
\begin{code}
-reportDeprecations :: DynFlags -> TcGblEnv -> RnM ()
-reportDeprecations dflags tcg_env
- = ifOptM Opt_WarnDeprecations $
- do { (eps,hpt) <- getEpsAndHpt
+finishDeprecations :: DynFlags -> Maybe DeprecTxt
+ -> TcGblEnv -> RnM TcGblEnv
+-- (a) Report usasge of deprecated imports
+-- (b) If the whole module is deprecated, update tcg_deprecs
+-- All this happens only once per module
+finishDeprecations dflags mod_deprec tcg_env
+ = do { (eps,hpt) <- getEpsAndHpt
+ ; ifOptM Opt_WarnDeprecations $
+ mapM_ (check hpt (eps_PIT eps)) all_gres
-- By this time, typechecking is complete,
-- so the PIT is fully populated
- ; mapM_ (check hpt (eps_PIT eps)) all_gres }
+
+ -- Deal with a module deprecation; it overrides all existing deprecs
+ ; let new_deprecs = case mod_deprec of
+ Just txt -> DeprecAll txt
+ Nothing -> tcg_deprecs tcg_env
+ ; return (tcg_env { tcg_deprecs = new_deprecs }) }
where
used_names = allUses (tcg_dus tcg_env)
-- Report on all deprecated uses; hence allUses
all_gres = globalRdrEnvElts (tcg_rdr_env tcg_env)
- avail_env = imp_parent (tcg_imports tcg_env)
-
- check hpt pit (GRE {gre_name = name, gre_prov = Imported (imp_spec:_)})
+ check hpt pit gre@(GRE {gre_name = name, gre_prov = Imported (imp_spec:_)})
| name `elemNameSet` used_names
- , Just deprec_txt <- lookupDeprec dflags hpt pit avail_env name
+ , Just deprec_txt <- lookupImpDeprec dflags hpt pit gre
= addWarnAt (importSpecLoc imp_spec)
(sep [ptext SLIT("Deprecated use of") <+>
pprNonVarNameSpace (occNameSpace (nameOccName name)) <+>
-- the defn of a non-deprecated thing, when changing a module's
-- interface
-lookupDeprec :: DynFlags -> HomePackageTable -> PackageIfaceTable
- -> NameEnv AvailInfo -- parent info
- -> Name -> Maybe DeprecTxt
-lookupDeprec dflags hpt pit avail_env n
- = case lookupIfaceByModule dflags hpt pit (nameModule n) of
- Just iface -> mi_dep_fn iface n `seqMaybe` -- Bleat if the thing, *or
- mi_dep_fn iface (nameParent n) -- its parent*, is deprec'd
- Nothing
- | isWiredInName n -> Nothing
- -- We have not necessarily loaded the .hi file for a
- -- wired-in name (yet), although we *could*.
- -- And we never deprecate them
-
- | otherwise -> pprPanic "lookupDeprec" (ppr n)
- -- By now all the interfaces should have been loaded
+lookupImpDeprec :: DynFlags -> HomePackageTable -> PackageIfaceTable
+ -> GlobalRdrElt -> Maybe DeprecTxt
+-- The name is definitely imported, so look in HPT, PIT
+lookupImpDeprec dflags hpt pit gre
+ = case lookupIfaceByModule dflags hpt pit (nameModule name) of
+ Just iface -> mi_dep_fn iface name `seqMaybe` -- Bleat if the thing, *or
+ case gre_par gre of
+ ParentIs p -> mi_dep_fn iface p -- its parent*, is deprec'd
+ NoParent -> Nothing
+
+ Nothing -> Nothing -- See Note [Used names with interface not loaded]
where
- nameParent n = case lookupNameEnv avail_env n of
- Just (AvailTC parent _) -> parent
- _ -> n
-
-gre_is_used :: NameSet -> GlobalRdrElt -> Bool
-gre_is_used used_names gre = gre_name gre `elemNameSet` used_names
+ name = gre_name gre
\end{code}
+Note [Used names with interface not loaded]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+By now all the interfaces should have been loaded,
+because reportDeprecations happens after typechecking.
+However, it's still (just) possible to to find a used
+Name whose interface hasn't been loaded:
+
+a) It might be a WiredInName; in that case we may not load
+ its interface (although we could).
+
+b) It might be GHC.Real.fromRational, or GHC.Num.fromInteger
+ These are seen as "used" by the renamer (if -fno-implicit-prelude)
+ is on), but the typechecker may discard their uses
+ if in fact the in-scope fromRational is GHC.Read.fromRational,
+ (see tcPat.tcOverloadedLit), and the typechecker sees that the type
+ is fixed, say, to GHC.Base.Float (see Inst.lookupSimpleInst).
+ In that obscure case it won't force the interface in.
+
+In both cases we simply don't permit deprecations;
+this is, after all, wired-in stuff.
+
+
%*********************************************************
%* *
Unused names
; warnDuplicateImports defined_and_used
; printMinimalImports minimal_imports }
where
- used_names, all_used_names :: NameSet
+ used_names :: NameSet
used_names = findUses (tcg_dus gbl_env) emptyNameSet
-- NB: currently, if f x = g, we only treat 'g' as used if 'f' is used
-- Hence findUses
- avail_env = imp_parent (tcg_imports gbl_env)
- nameParent_maybe n = case lookupNameEnv avail_env n of
- Just (AvailTC tc _) | tc /= n -> Just tc
- _otherwise -> Nothing
-
- all_used_names = used_names `unionNameSets`
- mkNameSet (mapCatMaybes nameParent_maybe (nameSetToList used_names))
- -- A use of C implies a use of T,
- -- if C was brought into scope by T(..) or T(C)
-
-- Collect the defined names from the in-scope environment
defined_names :: [GlobalRdrElt]
defined_names = globalRdrEnvElts (tcg_rdr_env gbl_env)
-- Note that defined_and_used, defined_but_not_used
-- are both [GRE]; that's why we need defined_and_used
- -- rather than just all_used_names
+ -- rather than just used_names
defined_and_used, defined_but_not_used :: [GlobalRdrElt]
(defined_and_used, defined_but_not_used)
- = partition (gre_is_used all_used_names) defined_names
+ = partition (gre_is_used used_names) defined_names
+ kids_env = mkChildEnv defined_names
+ -- This is done in mkExports too; duplicated work
+
+ gre_is_used :: NameSet -> GlobalRdrElt -> Bool
+ gre_is_used used_names (GRE {gre_name = name})
+ = name `elemNameSet` used_names
+ || any (`elemNameSet` used_names) (findChildren kids_env name)
+ -- A use of C implies a use of T,
+ -- if C was brought into scope by T(..) or T(C)
+
-- Filter out the ones that are
-- (a) defined in this module, and
-- (b) not defined by a 'deriving' clause
is_unused_local :: GlobalRdrElt -> Bool
is_unused_local gre = isLocalGRE gre && isExternalName (gre_name gre)
- unused_imports :: [GlobalRdrElt]
- unused_imports = filter unused_imp defined_but_not_used
- unused_imp (GRE {gre_prov = Imported imp_specs})
- = not (all (module_unused . importSpecModule) imp_specs)
- && or [exp | ImpSpec { is_item = ImpSome { is_explicit = exp } } <- imp_specs]
- -- Don't complain about unused imports if we've already said the
- -- entire import is unused
- unused_imp other = False
+ unused_imports :: [GlobalRdrElt]
+ unused_imports = mapCatMaybes unused_imp defined_but_not_used
+ unused_imp :: GlobalRdrElt -> Maybe GlobalRdrElt -- Result has trimmed Imported provenances
+ unused_imp gre@(GRE {gre_prov = LocalDef}) = Nothing
+ unused_imp gre@(GRE {gre_prov = Imported imp_specs})
+ | null trimmed_specs = Nothing
+ | otherwise = Just (gre {gre_prov = Imported trimmed_specs})
+ where
+ trimmed_specs = filter report_if_unused imp_specs
-- 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
-- We've carefully preserved the provenance so that we can
-- construct minimal imports that import the name by (one of)
-- the same route(s) as the programmer originally did.
- add_name (GRE {gre_name = n, gre_prov = Imported imp_specs}) acc
- = addToFM_C plusAvailEnv acc (importSpecModule (head imp_specs))
- (unitAvailEnv (mk_avail n (nameParent_maybe n)))
- add_name other acc
- = acc
+ add_name gre@(GRE {gre_prov = Imported (imp_spec:_)}) acc
+ = addToFM_C plusAvailEnv acc
+ (importSpecModule imp_spec) (unitAvailEnv (greAvail gre))
+ add_name gre acc = acc -- Local
-- Modules mentioned as 'module M' in the export list
expall_mods = case export_decls of
-- qualified imports into account. But it's an improvement.
add_expall mod acc = addToFM_C plusAvailEnv acc mod emptyAvailEnv
- -- n is the name of the thing, p is the name of its parent
- mk_avail n (Just p) = AvailTC p [p,n]
- mk_avail n Nothing | isTcOcc (nameOccName n) = AvailTC n [n]
- | otherwise = Avail n
-
add_inst_mod (mod,_,_) acc
| mod_name `elemFM` acc = acc -- We import something already
| otherwise = addToFM acc mod_name emptyAvailEnv
--
-- BUG WARNING: does not deal correctly with multiple imports of the same module
-- becuase direct_import_mods has only one entry per module
+ unused_imp_mods :: [(ModuleName, SrcSpan)]
unused_imp_mods = [(mod_name,loc) | (mod,no_imp,loc) <- direct_import_mods,
let mod_name = moduleName mod,
not (mod_name `elemFM` minimal_imports1),
module_unused :: ModuleName -> Bool
module_unused mod = any (((==) mod) . fst) unused_imp_mods
+ report_if_unused :: ImportSpec -> Bool
+ -- Do we want to report this as an unused import?
+ report_if_unused (ImpSpec {is_decl = d, is_item = i})
+ = not (module_unused (is_mod d)) -- Not if we've already said entire import is unused
+ && isExplicitItem i -- Only if the import was explicit
+
---------------------
warnDuplicateImports :: [GlobalRdrElt] -> RnM ()
-- Given the GREs for names that are used, figure out which imports
warnDuplicateImports gres
= ifOptM Opt_WarnUnusedImports $
sequenceM_ [ warn name pr
- -- The 'head' picks the first offending group
- -- for this particular name
| GRE { gre_name = name, gre_prov = Imported imps } <- gres
, pr <- redundants imps ]
where
redundants imps
= [ (red_imp, cov_imp)
| red_imp <- imps
+ , isExplicitItem (is_item red_imp)
+ -- Complain only about redundant imports
+ -- mentioned explicitly by the user
, cov_imp <- take 1 (filter (covers red_imp) imps) ]
+ -- The 'take 1' picks the first offending group
+ -- for this particular name
-- "red_imp" is a putative redundant import
-- "cov_imp" potentially covers it
= False -- They bring into scope different qualified names
| not (is_qual red_decl) && is_qual cov_decl
= False -- Covering one doesn't bring unqualified name into scope
+ | otherwise
+ = not (isExplicitItem cov_item) -- Redundant one is selective and covering one isn't
+ || red_later -- or both are explicit; tie-break using red_later
+{-
| red_selective
= not cov_selective -- Redundant one is selective and covering one isn't
|| red_later -- Both are explicit; tie-break using red_later
= not cov_selective -- Neither import is selective
&& (is_mod red_decl == is_mod cov_decl) -- They import the same module
&& red_later -- Tie-break
+-}
where
red_loc = importSpecLoc red_imp
cov_loc = importSpecLoc cov_imp
red_later = red_loc > cov_loc
- cov_selective = selectiveImpItem cov_item
- red_selective = selectiveImpItem red_item
-
-selectiveImpItem :: ImpItemSpec -> Bool
-selectiveImpItem ImpAll = False
-selectiveImpItem (ImpSome {}) = True
-- ToDo: deal with original imports with 'qualified' and 'as M' clauses
printMinimalImports :: FiniteMap ModuleName AvailEnv -- Minimal imports
printMinimalImports imps
= ifOptM Opt_D_dump_minimal_imports $ do {
- mod_ies <- mappM to_ies (fmToList imps) ;
+ mod_ies <- initIfaceTcRn $ mappM to_ies (fmToList imps) ;
this_mod <- getModule ;
rdr_env <- getGlobalRdrEnv ;
ioToTcRn (do { h <- openFile (mkFilename this_mod) WriteMode ;
to_ies (mod, avail_env) = do ies <- mapM to_ie (availEnvElts avail_env)
returnM (mod, ies)
- to_ie :: AvailInfo -> RnM (IE Name)
+ to_ie :: AvailInfo -> IfG (IE Name)
-- The main trick here is that if we're importing all the constructors
-- we want to say "T(..)", but if we're importing only a subset we want
-- to say "T(A,B,C)". So we have to find out what the module exports.
to_ie (AvailTC n [m]) = ASSERT( n==m )
returnM (IEThingAbs n)
to_ie (AvailTC n ns)
- = loadSrcInterface doc n_mod False `thenM` \ iface ->
+ = loadSysInterface doc n_mod `thenM` \ iface ->
case [xs | (m,as) <- mi_exports iface,
- moduleName m == n_mod,
+ m == n_mod,
AvailTC x xs <- as,
x == nameOccName n] of
[xs] | all_used xs -> returnM (IEThingAll n)
where
all_used avail_occs = all (`elem` map nameOccName ns) avail_occs
doc = text "Compute minimal imports from" <+> ppr n
- n_mod = moduleName (nameModule n)
+ n_mod = nameModule n
\end{code}
dodgyMsg kind tc
= sep [ ptext SLIT("The") <+> kind <+> ptext SLIT("item") <+> quotes (ppr (IEThingAll tc)),
- ptext SLIT("suggests that") <+> quotes (ppr tc) <+> ptext SLIT("has constructor or class methods"),
- ptext SLIT("but it has none; it is a type synonym or abstract type or class") ]
+ ptext SLIT("suggests that") <+> quotes (ppr tc) <+> ptext SLIT("has constructors or class methods,"),
+ ptext SLIT("but it has none") ]
-modExportErr mod
- = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (ppr mod)]
-
exportItemErr export_item
= sep [ ptext SLIT("The export item") <+> quotes (ppr export_item),
ptext SLIT("attempts to export constructors or class methods that are not visible here") ]
typeItemErr name wherestr
= sep [ ptext SLIT("Using 'type' tag on") <+> quotes (ppr name) <+> wherestr,
- ptext SLIT("Use -findexed-types to enable this extension") ]
+ ptext SLIT("Use -ftype-families to enable this extension") ]
+exportClashErr :: GlobalRdrEnv -> Name -> Name -> IE RdrName -> IE RdrName
+ -> Message
exportClashErr global_env name1 name2 ie1 ie2
= vcat [ ptext SLIT("Conflicting exports for") <+> quotes (ppr occ) <> colon
- , ppr_export ie1 name1
- , ppr_export ie2 name2 ]
+ , ppr_export ie1' name1'
+ , ppr_export ie2' name2' ]
where
occ = nameOccName name1
ppr_export ie name = nest 2 (quotes (ppr ie) <+> ptext SLIT("exports") <+>
= case lookupGRE_Name global_env name of
(gre:_) -> gre
[] -> pprPanic "exportClashErr" (ppr name)
+ get_loc name = nameSrcLoc $ gre_name $ get_gre name
+ (name1', ie1', name2', ie2') = if get_loc name1 < get_loc name2
+ then (name1, ie1, name2, ie2)
+ else (name2, ie2, name1, ie1)
addDupDeclErr :: Name -> Name -> TcRn ()
addDupDeclErr name_a name_b
quotes (ptext SLIT("Module") <+> ppr mod),
ptext SLIT("in export list")]
+nullModuleExport mod
+ = ptext SLIT("The export item `module") <+> ppr mod <> ptext SLIT("' exports nothing")
+
moduleDeprec mod txt
= sep [ ptext SLIT("Module") <+> quotes (ppr mod) <+> ptext SLIT("is deprecated:"),
nest 4 (ppr txt) ]
+
+implicitPreludeWarn
+ = ptext SLIT("Module `Prelude' implicitly imported")
\end{code}
projects / ghc-hetmet.git / blobdiff