\begin{code}
module RnNames (
rnImports, importsFromLocalDecls,
+ getLocalDeclBinders, extendRdrEnvRn,
reportUnusedNames, reportDeprecations,
mkModDeps, exportsFromAvail
) where
mkOccEnv, lookupOccEnv, emptyOccEnv, extendOccEnv )
import HscTypes ( GenAvailInfo(..), AvailInfo,
HomePackageTable, PackageIfaceTable,
- availNames, unQualInScope,
+ unQualInScope,
Deprecs(..), ModIface(..), Dependencies(..),
lookupIface, ExternalPackageState(..)
)
import RdrName ( RdrName, rdrNameOcc, setRdrNameSpace,
GlobalRdrEnv, mkGlobalRdrEnv, GlobalRdrElt(..),
emptyGlobalRdrEnv, plusGlobalRdrEnv, globalRdrEnvElts,
- unQualOK, lookupGRE_Name,
+ extendGlobalRdrEnv, lookupGlobalRdrEnv, unQualOK, lookupGRE_Name,
Provenance(..), ImportSpec(..),
isLocalGRE, pprNameProvenance )
import Outputable
import Maybes ( isNothing, catMaybes, mapCatMaybes, seqMaybe, orElse )
import SrcLoc ( Located(..), mkGeneralSrcSpan,
- unLoc, noLoc, srcLocSpan, combineSrcSpans, SrcSpan )
+ unLoc, noLoc, srcLocSpan, SrcSpan )
import BasicTypes ( DeprecTxt )
-import ListSetOps ( removeDups )
-import Util ( sortLe, notNull, isSingleton )
+import DriverPhases ( isHsBoot )
+import Util ( notNull, isSingleton )
import List ( partition )
import IO ( openFile, IOMode(..) )
\end{code}
Complain about duplicate bindings
\begin{code}
-importsFromLocalDecls :: HsGroup RdrName
- -> RnM (GlobalRdrEnv, ImportAvails)
+importsFromLocalDecls :: HsGroup RdrName -> RnM TcGblEnv
importsFromLocalDecls group
- = getModule `thenM` \ this_mod ->
- getLocalDeclBinders this_mod group `thenM` \ avails ->
- -- The avails that are returned don't include the "system" names
- let
- all_names :: [Name] -- All the defns; no dups eliminated
- all_names = [name | avail <- avails, name <- availNames avail]
-
- dups :: [[Name]]
- (_, dups) = removeDups compare all_names
- in
- -- Check for duplicate definitions
- -- The complaint will come out as "Multiple declarations of Foo.f" because
- -- since 'f' is in the env twice, the unQualInScope used by the error-msg
- -- printer returns False. It seems awkward to fix, unfortunately.
- mappM_ addDupDeclErr dups `thenM_`
+ = do { gbl_env <- getGblEnv
- doptM Opt_ImplicitPrelude `thenM` \ implicit_prelude ->
- let
- prov = LocalDef this_mod
- gbl_env = mkGlobalRdrEnv gres
- gres = [ GRE { gre_name = name, gre_prov = prov}
- | name <- all_names]
+ ; names <- 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
-- 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.
- filtered_names
- | implicit_prelude = all_names
- | otherwise = filter (not . isBuiltInSyntax) all_names
+ filtered_names
+ | implicit_prelude = names
+ | otherwise = filter (not . isBuiltInSyntax) names ;
- imports = emptyImportAvails {
- imp_env = unitModuleEnv this_mod $
+ ; this_mod = tcg_mod gbl_env
+ ; imports = emptyImportAvails {
+ imp_env = unitModuleEnv this_mod $
mkNameSet filtered_names
- }
- in
- returnM (gbl_env, imports)
-\end{code}
+ }
+ }
+ ; rdr_env' <- extendRdrEnvRn this_mod (tcg_rdr_env gbl_env) names
-%*********************************************************
-%* *
-\subsection{Getting binders out of a declaration}
-%* *
-%*********************************************************
+ ; returnM (gbl_env { tcg_rdr_env = rdr_env',
+ tcg_imports = imports `plusImportAvails` tcg_imports gbl_env })
+ }
+
+extendRdrEnvRn :: Module -> GlobalRdrEnv -> [Name] -> 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 mod rdr_env names
+ = foldlM add_local rdr_env names
+ where
+ add_local rdr_env name
+ | gres <- lookupGlobalRdrEnv rdr_env (nameOccName name)
+ , (dup_gre:_) <- filter isLocalGRE gres -- Check for existing *local* defns
+ = do { addDupDeclErr (gre_name dup_gre) name
+ ; return rdr_env }
+ | otherwise
+ = return (extendGlobalRdrEnv rdr_env new_gre)
+ where
+ new_gre = GRE {gre_name = name, gre_prov = prov}
+
+ prov = LocalDef mod
+\end{code}
@getLocalDeclBinders@ returns the names for an @HsDecl@. It's
used for source code.
*** See "THE NAMING STORY" in HsDecls ****
\begin{code}
-getLocalDeclBinders :: Module -> HsGroup RdrName -> RnM [AvailInfo]
-getLocalDeclBinders mod (HsGroup {hs_valds = val_decls,
- hs_tyclds = tycl_decls,
- hs_fords = foreign_decls })
- = -- For type and class decls, we generate Global names, with
- -- no export indicator. They need to be global because they get
- -- permanently bound into the TyCons and Classes. They don't need
- -- an export indicator because they are all implicitly exported.
-
- mappM new_tc tycl_decls `thenM` \ tc_avails ->
-
+getLocalDeclBinders :: TcGblEnv -> HsGroup RdrName -> RnM [Name]
+getLocalDeclBinders gbl_env (HsGroup {hs_valds = val_decls,
+ hs_tyclds = tycl_decls,
+ hs_fords = foreign_decls })
+ = do { tc_names_s <- mappM new_tc tycl_decls
+ ; val_names <- mappM new_simple val_bndrs
+ ; return (foldr (++) val_names tc_names_s) }
+ where
+ mod = tcg_mod gbl_env
+ is_hs_boot = isHsBoot (tcg_src gbl_env) ;
+ val_bndrs | is_hs_boot = sig_hs_bndrs
+ | otherwise = for_hs_bndrs ++ val_hs_bndrs
-- In a hs-boot file, the value binders come from the
-- *signatures*, and there should be no foreign binders
- tcIsHsBoot `thenM` \ is_hs_boot ->
- let val_bndrs | is_hs_boot = sig_hs_bndrs
- | otherwise = for_hs_bndrs ++ val_hs_bndrs
- in
- mappM new_simple val_bndrs `thenM` \ names ->
- returnM (tc_avails ++ map Avail names)
- where
new_simple rdr_name = newTopSrcBinder mod Nothing rdr_name
sig_hs_bndrs = [nm | HsBindGroup _ lsigs _ <- val_decls,
for_hs_bndrs = [nm | L _ (ForeignImport nm _ _ _) <- foreign_decls]
new_tc tc_decl
- = newTopSrcBinder mod Nothing main_rdr `thenM` \ main_name ->
- mappM (newTopSrcBinder mod (Just main_name)) sub_rdrs `thenM` \ sub_names ->
- returnM (AvailTC main_name (main_name : sub_names))
+ = do { main_name <- newTopSrcBinder mod Nothing main_rdr
+ ; sub_names <- mappM (newTopSrcBinder mod (Just main_name)) sub_rdrs
+ ; return (main_name : sub_names) }
where
(main_rdr : sub_rdrs) = tyClDeclNames (unLoc tc_decl)
\end{code}
(gre:_) -> gre
[] -> pprPanic "exportClashErr" (ppr name)
-addDupDeclErr :: [Name] -> TcRn ()
-addDupDeclErr names
- = addErrAt big_loc $
+addDupDeclErr :: Name -> Name -> TcRn ()
+addDupDeclErr name1 name2
+ = addErrAt (srcLocSpan loc2) $
vcat [ptext SLIT("Multiple declarations of") <+> quotes (ppr name1),
- ptext SLIT("Declared at:") <+> vcat (map ppr sorted_locs)]
+ ptext SLIT("Declared at:") <+> vcat [ppr (nameSrcLoc name1), ppr loc2]]
where
- locs = map nameSrcLoc names
- big_loc = foldr1 combineSrcSpans (map srcLocSpan locs)
- name1 = head names
- sorted_locs = sortLe (<=) (sortLe (<=) locs)
+ loc2 = nameSrcLoc name2
dupExportWarn occ_name ie1 ie2
= hsep [quotes (ppr occ_name),
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