X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Frename%2FRnNames.lhs;h=2f62681dd88a118a86ad8f6071e37516f80c1b32;hb=27286cf2ce6733cbbf008972c6bea30ea2e562ee;hp=9fcfd2877f9795101fc0315ad83d7d92e50e979d;hpb=786932468faac49aafe20b65eabc8bdf465fbc9d;p=ghc-hetmet.git diff --git a/compiler/rename/RnNames.lhs b/compiler/rename/RnNames.lhs index 9fcfd28..2f62681 100644 --- a/compiler/rename/RnNames.lhs +++ b/compiler/rename/RnNames.lhs @@ -6,7 +6,8 @@ \begin{code} module RnNames ( rnImports, getLocalNonValBinders, - rnExports, extendGlobalRdrEnvRn, + rnExports, extendGlobalRdrEnvRn, + gresFromAvails, reportUnusedNames, finishWarnings, ) where @@ -69,10 +70,11 @@ rnImports imports when (notNull prel_imports) $ addWarn (implicitPreludeWarn) ) - stuff1 <- mapM (rnImportDecl this_mod) (prel_imports ++ ordinary) - stuff2 <- mapM (rnImportDecl this_mod) source - let (decls, rdr_env, imp_avails,hpc_usage) = combine (stuff1 ++ stuff2) - return (decls, rdr_env, imp_avails,hpc_usage) + stuff1 <- mapM (rnImportDecl this_mod True) prel_imports + stuff2 <- mapM (rnImportDecl this_mod False) ordinary + stuff3 <- mapM (rnImportDecl this_mod False) source + let (decls, rdr_env, imp_avails, hpc_usage) = combine (stuff1 ++ stuff2 ++ stuff3) + return (decls, rdr_env, imp_avails, hpc_usage) where combine :: [(LImportDecl Name, GlobalRdrEnv, ImportAvails,AnyHpcUsage)] @@ -85,11 +87,11 @@ rnImports imports imp_avails1 `plusImportAvails` imp_avails2, hpc_usage1 || hpc_usage2) -rnImportDecl :: Module +rnImportDecl :: Module -> Bool -> LImportDecl RdrName -> RnM (LImportDecl Name, GlobalRdrEnv, ImportAvails,AnyHpcUsage) -rnImportDecl this_mod (L loc (ImportDecl loc_imp_mod_name mb_pkg want_boot +rnImportDecl this_mod implicit_prelude (L loc (ImportDecl loc_imp_mod_name mb_pkg want_boot qual_only as_mod imp_details)) = setSrcSpan loc $ do @@ -103,6 +105,17 @@ rnImportDecl this_mod (L loc (ImportDecl loc_imp_mod_name mb_pkg want_boot imp_mod_name = unLoc loc_imp_mod_name doc = ppr imp_mod_name <+> ptext (sLit "is directly imported") + let isExplicit lie = case unLoc lie of + IEThingAll _ -> False + _ -> True + case imp_details of + Just (False, lies) + | all isExplicit lies -> + return () + _ -> + unless implicit_prelude $ + ifOptM Opt_WarnMissingImportList (addWarn (missingImportListWarn imp_mod_name)) + iface <- loadSrcInterface doc imp_mod_name want_boot mb_pkg -- Compiler sanity check: if the import didn't say @@ -260,23 +273,34 @@ top level binders specially in two ways 2. We make them *shadow* the outer bindings. If we don't do that, we'll get a complaint when extending the GlobalRdrEnv, saying that - there are two bindings for 'f'. - - This shadowing applies even if the binding for 'f' is in a - where-clause, and hence is in the *local* RdrEnv not the *global* - RdrEnv. - -We find out whether we are inside a [d| ... |] by testing the TH -stage. This is a slight hack, because the stage field was really meant for -the type checker, and here we are not interested in the fields of Brack, -hence the error thunks in thRnBrack. + there are two bindings for 'f'. There are several tricky points: + + * This shadowing applies even if the binding for 'f' is in a + where-clause, and hence is in the *local* RdrEnv not the *global* + RdrEnv. + + * The *qualified* name M.f from the enclosing module must certainly + still be available. So we don't nuke it entirely; we just make + it seem like qualified import. + + * We only shadow *External* names (which come from the main module) + Do not shadow *Inernal* names because in the bracket + [d| class C a where f :: a + f = 4 |] + rnSrcDecls will first call extendGlobalRdrEnvRn with C[f] from the + class decl, and *separately* extend the envt with the value binding. + +3. We find out whether we are inside a [d| ... |] by testing the TH + stage. This is a slight hack, because the stage field was really + meant for the type checker, and here we are not interested in the + fields of Brack, hence the error thunks in thRnBrack. \begin{code} extendGlobalRdrEnvRn :: [AvailInfo] -> MiniFixityEnv -> RnM (TcGblEnv, TcLclEnv) -- Updates both the GlobalRdrEnv and the FixityEnv - -- We return a new TcLclEnv only becuase we might have to + -- We return a new TcLclEnv only because we might have to -- delete some bindings from it; -- see Note [Top-level Names in Template Haskell decl quotes] @@ -292,7 +316,7 @@ extendGlobalRdrEnvRn avails new_fixities -- See Note [Top-level Names in Template Haskell decl quotes] shadowP = isBrackStage stage new_occs = map (nameOccName . gre_name) gres - rdr_env1 = hideSomeUnquals rdr_env new_occs + rdr_env1 = transformGREs qual_gre new_occs rdr_env lcl_env1 = lcl_env { tcl_rdr = delListFromOccEnv (tcl_rdr lcl_env) new_occs } (rdr_env2, lcl_env2) | shadowP = (rdr_env1, lcl_env1) | otherwise = (rdr_env, lcl_env) @@ -319,6 +343,35 @@ extendGlobalRdrEnvRn avails new_fixities where name = gre_name gre occ = nameOccName name + + qual_gre :: GlobalRdrElt -> GlobalRdrElt + -- Transform top-level GREs from the module being compiled + -- so that they are out of the way of new definitions in a Template + -- Haskell bracket + -- See Note [Top-level Names in Template Haskell decl quotes] + -- Seems like 5 times as much work as it deserves! + -- + -- For a LocalDef we make a (fake) qualified imported GRE for a + -- local GRE so that the original *qualified* name is still in scope + -- but the *unqualified* one no longer is. What a hack! + + qual_gre gre@(GRE { gre_prov = LocalDef, gre_name = name }) + | isExternalName name = gre { gre_prov = Imported [imp_spec] } + | otherwise = gre + -- Do not shadow Internal (ie Template Haskell) Names + -- See Note [Top-level Names in Template Haskell decl quotes] + where + mod = ASSERT2( isExternalName name, ppr name) moduleName (nameModule name) + imp_spec = ImpSpec { is_item = ImpAll, is_decl = decl_spec } + decl_spec = ImpDeclSpec { is_mod = mod, is_as = mod, + is_qual = True, -- Qualified only! + is_dloc = srcLocSpan (nameSrcLoc name) } + + qual_gre gre@(GRE { gre_prov = Imported specs }) + = gre { gre_prov = Imported (map qual_spec specs) } + + qual_spec spec@(ImpSpec { is_decl = decl_spec }) + = spec { is_decl = decl_spec { is_qual = True } } \end{code} @getLocalDeclBinders@ returns the names for an @HsDecl@. It's @@ -376,8 +429,8 @@ getLocalNonValBinders :: HsGroup RdrName -> RnM [AvailInfo] -- Get all the top-level binders bound the group *except* -- for value bindings, which are treated separately -- Specificaly we return AvailInfo for --- type decls --- class decls +-- type decls (incl constructors and record selectors) +-- class decls (including class ops) -- associated types -- foreign imports -- (in hs-boot files) value signatures @@ -1446,6 +1499,10 @@ nullModuleExport :: ModuleName -> SDoc nullModuleExport mod = ptext (sLit "The export item `module") <+> ppr mod <> ptext (sLit "' exports nothing") +missingImportListWarn :: ModuleName -> SDoc +missingImportListWarn mod + = ptext (sLit "The module") <+> quotes (ppr mod) <+> ptext (sLit "does not have an explicit import list") + moduleWarn :: ModuleName -> WarningTxt -> SDoc moduleWarn mod (WarningTxt txt) = sep [ ptext (sLit "Module") <+> quotes (ppr mod) <> ptext (sLit ":"),