\begin{code}
module RnNames (
- getGlobalNames
+ getGlobalNames, exportsFromAvail
) where
#include "HsVersions.h"
-import CmdLineOpts ( opt_NoImplicitPrelude, opt_WarnDuplicateExports,
- opt_SourceUnchanged, opt_WarnUnusedBinds
- )
-
-import HsSyn ( HsModule(..), HsDecl(..), TyClDecl(..),
- IE(..), ieName,
- ForeignDecl(..), ForKind(..), isDynamic,
- FixitySig(..), Sig(..), ImportDecl(..),
- collectTopBinders
- )
-import RdrHsSyn ( RdrNameIE, RdrNameImportDecl,
- RdrNameHsModule, RdrNameHsDecl
- )
-import RnIfaces ( getInterfaceExports, getDeclBinders,
- recordSlurp, checkUpToDate
- )
+import CmdLineOpts ( DynFlag(..) )
+
+import HsSyn ( HsModule(..), HsDecl(..), IE(..), ieName, ImportDecl(..),
+ ForeignDecl(..), ForKind(..), isDynamicExtName,
+ collectLocatedHsBinders
+ )
+import RdrHsSyn ( RdrNameIE, RdrNameImportDecl,
+ RdrNameHsModule, RdrNameHsDecl
+ )
+import RnIfaces ( recordLocalSlurps )
+import RnHiFiles ( getTyClDeclBinders, loadInterface )
import RnEnv
import RnMonad
import FiniteMap
-import PrelMods
-import PrelInfo ( main_RDR )
-import UniqFM ( lookupUFM )
-import Bag ( bagToList )
-import Maybes ( maybeToBool )
-import Module ( ModuleName, mkThisModule, pprModuleName, WhereFrom(..) )
+import PrelNames ( pRELUDE_Name, mAIN_Name, main_RDR_Unqual, isUnboundName )
+import UniqFM ( lookupUFM )
+import Bag ( bagToList )
+import Module ( ModuleName, moduleName, WhereFrom(..) )
import NameSet
-import Name ( Name, ExportFlag(..), ImportReason(..), Provenance(..),
- isLocallyDefined, setNameProvenance,
- nameOccName, getSrcLoc, pprProvenance, getNameProvenance
- )
-import RdrName ( RdrName, rdrNameOcc, mkRdrQual, mkRdrUnqual, isQual )
-import SrcLoc ( SrcLoc )
-import NameSet ( elemNameSet, emptyNameSet )
+import Name ( Name, nameSrcLoc, nameOccName, nameEnvElts )
+import HscTypes ( Provenance(..), ImportReason(..), GlobalRdrEnv,
+ GenAvailInfo(..), AvailInfo, Avails, AvailEnv,
+ Deprecations(..), ModIface(..)
+ )
+import RdrName ( rdrNameOcc, setRdrNameOcc )
+import OccName ( setOccNameSpace, dataName )
+import NameSet ( elemNameSet, emptyNameSet )
import Outputable
-import Unique ( getUnique )
-import Util ( removeDups, equivClassesByUniq, sortLt )
-import List ( partition )
+import Maybes ( maybeToBool, catMaybes, mapMaybe )
+import UniqFM ( emptyUFM, listToUFM )
+import ListSetOps ( removeDups )
+import Util ( sortLt )
+import List ( partition )
\end{code}
%************************************************************************
\begin{code}
-getGlobalNames :: RdrNameHsModule
- -> RnMG (Maybe (ExportEnv,
- GlobalRdrEnv,
- FixityEnv, -- Fixities for local decls only
- NameEnv AvailInfo -- Maps a name to its parent AvailInfo
- -- Just for in-scope things only
- ))
- -- Nothing => no need to recompile
-
-getGlobalNames (HsModule this_mod _ exports imports decls mod_loc)
- = -- These two fix-loops are to get the right
- -- provenance information into a Name
- fixRn (\ ~(rec_gbl_env, rec_exported_avails, _) ->
-
--- fixRn (\ ~(rec_rn_env, _) ->
- let
- rec_unqual_fn :: Name -> Bool -- Is this chap in scope unqualified?
- rec_unqual_fn = unQualInScope rec_gbl_env
-
- rec_exp_fn :: Name -> ExportFlag
- rec_exp_fn = mk_export_fn (availsToNameSet rec_exported_avails)
- in
--- setOmitQualFn rec_unqual_fn $
- setModuleRn this_mod $
+getGlobalNames :: Module -> RdrNameHsModule
+ -> RnMG (GlobalRdrEnv, -- Maps all in-scope things
+ GlobalRdrEnv, -- Maps just *local* things
+ ExportAvails) -- The exported stuff
- -- PROCESS LOCAL DECLS
+getGlobalNames this_mod (HsModule _ _ _ imports decls _ mod_loc)
+ = -- PROCESS LOCAL DECLS
-- Do these *first* so that the correct provenance gets
-- into the global name cache.
- importsFromLocalDecls this_mod rec_exp_fn decls `thenRn` \ (local_gbl_env, local_mod_avails) ->
+ importsFromLocalDecls this_mod decls `thenRn` \ (local_gbl_env, local_mod_avails) ->
-- PROCESS IMPORT DECLS
-- Do the non {- SOURCE -} ones first, so that we get a helpful
-- warning for {- SOURCE -} ones that are unnecessary
+ doptRn Opt_NoImplicitPrelude `thenRn` \ opt_no_prelude ->
let
+ all_imports = mk_prel_imports opt_no_prelude ++ imports
(source, ordinary) = partition is_source_import all_imports
is_source_import (ImportDecl _ ImportByUserSource _ _ _ _) = True
is_source_import other = False
+
+ get_imports = importsFromImportDecl this_mod_name
in
- mapAndUnzipRn (importsFromImportDecl rec_unqual_fn) ordinary `thenRn` \ (imp_gbl_envs1, imp_avails_s1) ->
- mapAndUnzipRn (importsFromImportDecl rec_unqual_fn) source `thenRn` \ (imp_gbl_envs2, imp_avails_s2) ->
+ mapAndUnzipRn get_imports ordinary `thenRn` \ (imp_gbl_envs1, imp_avails_s1) ->
+ mapAndUnzipRn get_imports source `thenRn` \ (imp_gbl_envs2, imp_avails_s2) ->
-- COMBINE RESULTS
-- We put the local env second, so that a local provenance
all_avails :: ExportAvails
all_avails = foldr plusExportAvails local_mod_avails (imp_avails_s2 ++ imp_avails_s1)
in
--- returnRn (gbl_env, all_avails)
--- ) `thenRn` \ (gbl_env, all_avails) ->
- -- TRY FOR EARLY EXIT
- -- We can't go for an early exit before this because we have to check
- -- for name clashes. Consider:
- --
- -- module A where module B where
- -- import B h = True
- -- f = h
- --
- -- Suppose I've compiled everything up, and then I add a
- -- new definition to module B, that defines "f".
- --
- -- Then I must detect the name clash in A before going for an early
- -- exit. The early-exit code checks what's actually needed from B
- -- to compile A, and of course that doesn't include B.f. That's
- -- why we wait till after the plusEnv stuff to do the early-exit.
- checkEarlyExit this_mod `thenRn` \ up_to_date ->
- if up_to_date then
- returnRn (gbl_env, junk_exp_fn, Nothing)
- else
-
- -- RECORD BETTER PROVENANCES IN THE CACHE
- -- The names in the envirnoment have better provenances (e.g. imported on line x)
- -- than the names in the name cache. We update the latter now, so that we
- -- we start renaming declarations we'll get the good names
- -- The isQual is because the qualified name is always in scope
- updateProvenances (concat [names | (rdr_name, names) <- rdrEnvToList imp_gbl_env,
- isQual rdr_name]) `thenRn_`
-
- -- PROCESS EXPORT LISTS
- exportsFromAvail this_mod exports all_avails gbl_env `thenRn` \ exported_avails ->
-
- -- DONE
- returnRn (gbl_env, exported_avails, Just all_avails)
- ) `thenRn` \ (gbl_env, exported_avails, maybe_stuff) ->
-
- case maybe_stuff of {
- Nothing -> returnRn Nothing ;
- Just all_avails ->
-
- traceRn (text "updateProv" <+> fsep (map ppr (rdrEnvElts gbl_env))) `thenRn_`
-
- -- DEAL WITH FIXITIES
- fixitiesFromLocalDecls gbl_env decls `thenRn` \ local_fixity_env ->
- let
- -- Export only those fixities that are for names that are
- -- (a) defined in this module
- -- (b) exported
- exported_fixities :: [(Name,Fixity)]
- exported_fixities = [(name,fixity) | FixitySig name fixity _ <- nameEnvElts local_fixity_env,
- isLocallyDefined name
- ]
- in
- traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts local_fixity_env))) `thenRn_`
-
- --- TIDY UP
- let
- export_env = ExportEnv exported_avails exported_fixities
- (_, global_avail_env) = all_avails
- in
- returnRn (Just (export_env, gbl_env, local_fixity_env, global_avail_env))
- }
+ -- ALL DONE
+ returnRn (gbl_env, local_gbl_env, all_avails)
where
- junk_exp_fn = error "RnNames:export_fn"
-
- all_imports = prel_imports ++ imports
+ this_mod_name = moduleName this_mod
-- 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.
- prel_imports | this_mod == pRELUDE_Name ||
- explicit_prelude_import ||
- opt_NoImplicitPrelude
- = []
-
- | otherwise = [ImportDecl pRELUDE_Name
- ImportByUser
- False {- Not qualified -}
- Nothing {- No "as" -}
- Nothing {- No import list -}
- mod_loc]
+ mk_prel_imports no_prelude
+ | this_mod_name == pRELUDE_Name ||
+ explicit_prelude_import ||
+ no_prelude
+ = []
+
+ | otherwise = [ImportDecl pRELUDE_Name
+ ImportByUser
+ False {- Not qualified -}
+ Nothing {- No "as" -}
+ Nothing {- No import list -}
+ mod_loc]
explicit_prelude_import
= not (null [ () | (ImportDecl mod _ _ _ _ _) <- imports, mod == pRELUDE_Name ])
\end{code}
\begin{code}
-checkEarlyExit mod
- = checkErrsRn `thenRn` \ no_errs_so_far ->
- if not no_errs_so_far then
- -- Found errors already, so exit now
- returnRn True
- else
-
- traceRn (text "Considering whether compilation is required...") `thenRn_`
- if not opt_SourceUnchanged then
- -- Source code changed and no errors yet... carry on
- traceRn (nest 4 (text "source file changed or recompilation check turned off")) `thenRn_`
- returnRn False
- else
-
- -- Unchanged source, and no errors yet; see if usage info
- -- up to date, and exit if so
- checkUpToDate mod `thenRn` \ up_to_date ->
- putDocRn (text "Compilation" <+>
- text (if up_to_date then "IS NOT" else "IS") <+>
- text "required") `thenRn_`
- returnRn up_to_date
-\end{code}
-
-\begin{code}
-importsFromImportDecl :: (Name -> Bool) -- OK to omit qualifier
+importsFromImportDecl :: ModuleName
-> RdrNameImportDecl
-> RnMG (GlobalRdrEnv,
ExportAvails)
-importsFromImportDecl is_unqual (ImportDecl imp_mod_name from qual_only as_mod import_spec iloc)
+importsFromImportDecl this_mod_name (ImportDecl imp_mod_name from qual_only as_mod import_spec iloc)
= pushSrcLocRn iloc $
- getInterfaceExports imp_mod_name from `thenRn` \ (imp_mod, avails) ->
- if null avails then
- -- If there's an error in getInterfaceExports, (e.g. interface
+ loadInterface (ppr imp_mod_name <+> ptext SLIT("is directly imported"))
+ imp_mod_name from `thenRn` \ iface ->
+ let
+ imp_mod = mi_module iface
+ avails_by_module = mi_exports iface
+ deprecs = mi_deprecs iface
+
+ avails :: Avails
+ avails = [ avail | (mod_name, avails) <- avails_by_module,
+ mod_name /= this_mod_name,
+ avail <- avails ]
+ -- If the module exports anything defined in this module, just ignore it.
+ -- Reason: otherwise it looks as if there are two local definition sites
+ -- for the thing, and an error gets reported. Easiest thing is just to
+ -- filter them out up front. This situation only arises if a module
+ -- imports itself, or another module that imported it. (Necessarily,
+ -- this invoves a loop.)
+ --
+ -- Tiresome consequence: if you say
+ -- module A where
+ -- import B( AType )
+ -- type AType = ...
+ --
+ -- module B( AType ) where
+ -- import {-# SOURCE #-} A( AType )
+ --
+ -- then you'll get a 'B does not export AType' message. Oh well.
+
+ in
+ if null avails_by_module then
+ -- If there's an error in loadInterface, (e.g. interface
-- file not found) we get lots of spurious errors from 'filterImports'
returnRn (emptyRdrEnv, mkEmptyExportAvails imp_mod_name)
else
- filterImports imp_mod_name import_spec avails `thenRn` \ (filtered_avails, hides, explicits) ->
+ -- Complain if we import a deprecated module
+ (case deprecs of
+ DeprecAll txt -> addWarnRn (moduleDeprec imp_mod_name txt)
+ other -> returnRn ()
+ ) `thenRn_`
+
+ -- Filter the imports according to the import list
+ filterImports imp_mod_name from import_spec avails `thenRn` \ (filtered_avails, hides, explicits) ->
- -- We 'improve' the provenance by setting
- -- (a) the import-reason field, so that the Name says how it came into scope
- -- including whether it's explicitly imported
- -- (b) the print-unqualified field
- -- But don't fiddle with wired-in things or we get in a twist
let
- improve_prov name = setNameProvenance name (NonLocalDef (UserImport imp_mod iloc (is_explicit name))
- (is_unqual name))
- is_explicit name = name `elemNameSet` explicits
+ unqual_imp = not qual_only -- Maybe want unqualified names
+ qual_mod = case as_mod of
+ Nothing -> imp_mod_name
+ Just another_name -> another_name
+
+ mk_prov name = NonLocalDef (UserImport imp_mod iloc (name `elemNameSet` explicits))
+ gbl_env = mkGlobalRdrEnv qual_mod unqual_imp True hides mk_prov filtered_avails deprecs
+ exports = mkExportAvails qual_mod unqual_imp gbl_env filtered_avails
in
- qualifyImports imp_mod_name
- (not qual_only) -- Maybe want unqualified names
- as_mod hides
- filtered_avails improve_prov `thenRn` \ (rdr_name_env, mod_avails) ->
-
- returnRn (rdr_name_env, mod_avails)
+ returnRn (gbl_env, exports)
\end{code}
\begin{code}
-importsFromLocalDecls mod_name rec_exp_fn decls
- = mapRn (getLocalDeclBinders newLocalName) decls `thenRn` \ avails_s ->
-
+importsFromLocalDecls this_mod decls
+ = mapRn (getLocalDeclBinders this_mod) decls `thenRn` \ avails_s ->
+ -- The avails that are returned don't include the "system" names
let
avails = concat avails_s
all_names = [name | avail <- avails, name <- availNames avail]
dups :: [[Name]]
- dups = filter non_singleton (equivClassesByUniq getUnique all_names)
- where
- non_singleton (x1:x2:xs) = True
- non_singleton other = False
+ (_, dups) = removeDups compare all_names
in
-- Check for duplicate definitions
- mapRn_ (addErrRn . dupDeclErr) dups `thenRn_`
+ mapRn_ (addErrRn . dupDeclErr) dups `thenRn_`
- -- Record that locally-defined things are available
- mapRn_ (recordSlurp Nothing) avails `thenRn_`
-
- -- Build the environment
- qualifyImports mod_name
- True -- Want unqualified names
- Nothing -- no 'as M'
- [] -- Hide nothing
- avails
- (\n -> n)
+ -- Record that locally-defined things are available
+ recordLocalSlurps (availsToNameSet avails) `thenRn_`
+ let
+ mod_name = moduleName this_mod
+ unqual_imp = True -- Want unqualified names
+ mk_prov n = LocalDef -- Provenance is local
+ hides = [] -- Hide nothing
+
+ gbl_env = mkGlobalRdrEnv mod_name unqual_imp True hides mk_prov avails NoDeprecs
+ -- NoDeprecs: don't complain about locally defined names
+ -- For a start, we may be exporting a deprecated thing
+ -- Also we may use a deprecated thing in the defn of another
+ -- deprecated things. We may even use a deprecated thing in
+ -- the defn of a non-deprecated thing, when changing a module's
+ -- interface
+
+ exports = mkExportAvails mod_name unqual_imp gbl_env avails
+ in
+ returnRn (gbl_env, exports)
+
+---------------------------
+getLocalDeclBinders :: Module -> RdrNameHsDecl -> RnMG [AvailInfo]
+getLocalDeclBinders mod (TyClD tycl_decl)
+ = -- 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.
+ getTyClDeclBinders mod tycl_decl `thenRn` \ (avail, sys_names) ->
+
+ -- Record that the system names are available
+ recordLocalSlurps (mkNameSet sys_names) `thenRn_`
+ returnRn [avail]
+
+getLocalDeclBinders mod (ValD binds)
+ = mapRn new (collectLocatedHsBinders binds) `thenRn` \ avails ->
+ returnRn avails
where
- newLocalName rdr_name loc = newLocalTopBinder mod (rdrNameOcc rdr_name)
- rec_exp_fn loc
- mod = mkThisModule mod_name
-
-getLocalDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function
- -> RdrNameHsDecl
- -> RnMG Avails
-getLocalDeclBinders new_name (ValD binds)
- = mapRn do_one (bagToList (collectTopBinders binds))
- where
- do_one (rdr_name, loc) = new_name rdr_name loc `thenRn` \ name ->
- returnRn (Avail name)
+ new (rdr_name, loc) = newTopBinder mod rdr_name loc `thenRn` \ name ->
+ returnRn (Avail name)
- -- foreign declarations
-getLocalDeclBinders new_name (ForD (ForeignDecl nm kind _ dyn _ loc))
- | binds_haskell_name kind dyn
- = new_name nm loc `thenRn` \ name ->
+getLocalDeclBinders mod (ForD (ForeignDecl nm kind _ ext_nm _ loc))
+ | binds_haskell_name kind
+ = newTopBinder mod nm loc `thenRn` \ name ->
returnRn [Avail name]
- | otherwise
+ | otherwise -- a foreign export
= returnRn []
-
-getLocalDeclBinders new_name decl
- = getDeclBinders new_name decl `thenRn` \ maybe_avail ->
- case maybe_avail of
- Nothing -> returnRn [] -- Instance decls and suchlike
- Just avail -> returnRn [avail]
-
-binds_haskell_name (FoImport _) _ = True
-binds_haskell_name FoLabel _ = True
-binds_haskell_name FoExport ext_nm = isDynamic ext_nm
-
-fixitiesFromLocalDecls :: GlobalRdrEnv -> [RdrNameHsDecl] -> RnMG FixityEnv
-fixitiesFromLocalDecls gbl_env decls
- = foldlRn getFixities emptyNameEnv decls
where
- getFixities :: FixityEnv -> RdrNameHsDecl -> RnMG FixityEnv
- getFixities acc (FixD fix)
- = fix_decl acc fix
-
- getFixities acc (TyClD (ClassDecl _ _ _ sigs _ _ _ _ _ _))
- = foldlRn fix_decl acc [sig | FixSig sig <- sigs]
- -- Get fixities from class decl sigs too.
- getFixities acc other_decl
- = returnRn acc
-
- fix_decl 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:_) ->
-
- -- Check for duplicate fixity decl
- case lookupNameEnv acc name of {
- Just (FixitySig _ _ loc') -> addErrRn (dupFixityDecl rdr_name loc loc') `thenRn_`
- returnRn acc ;
-
- Nothing -> returnRn (addToNameEnv acc name (FixitySig name fixity loc))
- }}
+ binds_haskell_name (FoImport _) = True
+ binds_haskell_name FoLabel = True
+ binds_haskell_name FoExport = isDynamicExtName ext_nm
+
+getLocalDeclBinders mod (FixD _) = returnRn []
+getLocalDeclBinders mod (DeprecD _) = returnRn []
+getLocalDeclBinders mod (DefD _) = returnRn []
+getLocalDeclBinders mod (InstD _) = returnRn []
+getLocalDeclBinders mod (RuleD _) = returnRn []
\end{code}
+
%************************************************************************
%* *
\subsection{Filtering imports}
\begin{code}
filterImports :: ModuleName -- The module being imported
+ -> WhereFrom -- Tells whether it's a {-# SOURCE #-} import
-> Maybe (Bool, [RdrNameIE]) -- Import spec; True => hiding
-> [AvailInfo] -- What's available
-> RnMG ([AvailInfo], -- What's actually imported
- [AvailInfo], -- What's to be hidden (the unqualified version, that is)
+ [AvailInfo], -- What's to be hidden
+ -- (the unqualified version, that is)
+ -- (We need to return both the above sets, because
+ -- the qualified version is never hidden; so we can't
+ -- implement hiding by reducing what's imported.)
NameSet) -- What was imported explicitly
-- Complains if import spec mentions things that the module doesn't export
-- Warns/informs if import spec contains duplicates.
-filterImports mod Nothing imports
+filterImports mod from Nothing imports
= returnRn (imports, [], emptyNameSet)
-filterImports mod (Just (want_hiding, import_items)) avails
- = mapMaybeRn check_item import_items `thenRn` \ avails_w_explicits ->
+filterImports mod from (Just (want_hiding, import_items)) total_avails
+ = flatMapRn get_item import_items `thenRn` \ avails_w_explicits ->
let
(item_avails, explicits_s) = unzip avails_w_explicits
explicits = foldl addListToNameSet emptyNameSet explicits_s
if want_hiding
then
-- All imported; item_avails to be hidden
- returnRn (avails, item_avails, emptyNameSet)
+ returnRn (total_avails, item_avails, emptyNameSet)
else
-- Just item_avails imported; nothing to be hidden
returnRn (item_avails, [], explicits)
where
import_fm :: FiniteMap OccName AvailInfo
import_fm = listToFM [ (nameOccName name, avail)
- | avail <- avails,
+ | avail <- total_avails,
name <- availNames avail]
-- Even though availNames returns data constructors too,
-- they won't make any difference because naked entities like T
-- in an import list map to TcOccs, not VarOccs.
- check_item item@(IEModuleContents _)
- = addErrRn (badImportItemErr mod item) `thenRn_`
- returnRn Nothing
+ bale_out item = addErrRn (badImportItemErr mod from item) `thenRn_`
+ returnRn []
+
+ get_item item@(IEModuleContents _) = bale_out item
+
+ get_item item@(IEThingAll _)
+ = case check_item item of
+ Nothing -> bale_out item
+ Just avail@(AvailTC _ [n]) -> -- This occurs when you import T(..), but
+ -- only export T abstractly. The single [n]
+ -- in the AvailTC is the type or class itself
+ addWarnRn (dodgyImportWarn mod item) `thenRn_`
+ returnRn [(avail, [availName avail])]
+ Just avail -> returnRn [(avail, [availName avail])]
+
+ get_item item@(IEThingAbs n)
+ | want_hiding -- hiding( C )
+ -- Here the 'C' can be a data constructor *or* a type/class
+ = case catMaybes [check_item item, check_item (IEThingAbs data_n)] of
+ [] -> bale_out item
+ avails -> returnRn [(a, []) | a <- avails]
+ -- The 'explicits' list is irrelevant when hiding
+ where
+ data_n = setRdrNameOcc n (setOccNameSpace (rdrNameOcc n) dataName)
+
+ get_item item
+ = case check_item item of
+ Nothing -> bale_out item
+ Just avail -> returnRn [(avail, availNames avail)]
check_item item
| not (maybeToBool maybe_in_import_avails) ||
not (maybeToBool maybe_filtered_avail)
- = addErrRn (badImportItemErr mod item) `thenRn_`
- returnRn Nothing
+ = Nothing
- | dodgy_import = addWarnRn (dodgyImportWarn mod item) `thenRn_`
- returnRn (Just (filtered_avail, explicits))
-
- | otherwise = returnRn (Just (filtered_avail, explicits))
+ | otherwise
+ = Just filtered_avail
where
wanted_occ = rdrNameOcc (ieName item)
Just avail = maybe_in_import_avails
maybe_filtered_avail = filterAvail item avail
Just filtered_avail = maybe_filtered_avail
- explicits | dot_dot = [availName filtered_avail]
- | otherwise = availNames filtered_avail
-
- dot_dot = case item of
- IEThingAll _ -> True
- other -> False
-
- dodgy_import = case (item, avail) of
- (IEThingAll _, AvailTC _ [n]) -> True
- -- This occurs when you import T(..), but
- -- only export T abstractly. The single [n]
- -- in the AvailTC is the type or class itself
-
- other -> False
\end{code}
%* *
%************************************************************************
-@qualifyImports@ takes the @ExportEnv@ after filtering through the import spec
-of an import decl, and deals with producing an @RnEnv@ with the
-right qualified names. It also turns the @Names@ in the @ExportEnv@ into
-fully fledged @Names@.
-
\begin{code}
-qualifyImports :: ModuleName -- Imported module
- -> Bool -- True <=> want unqualified import
- -> Maybe ModuleName -- Optional "as M" part
- -> [AvailInfo] -- What's to be hidden
- -> Avails -- Whats imported and how
- -> (Name -> Name) -- Improves the provenance on imported things
- -> RnMG (GlobalRdrEnv, ExportAvails)
- -- NB: the Names in ExportAvails don't have the improve-provenance
- -- function applied to them
- -- We could fix that, but I don't think it matters
-
-qualifyImports this_mod unqual_imp as_mod hides
- avails improve_prov
- =
- -- Make the name environment. We're talking about a
- -- single module here, so there must be no name clashes.
- -- In practice there only ever will be if it's the module
- -- being compiled.
- let
- -- Add the things that are available
- name_env1 = foldl add_avail emptyRdrEnv avails
+mkEmptyExportAvails :: ModuleName -> ExportAvails
+mkEmptyExportAvails mod_name = (unitFM mod_name [], emptyUFM)
+
+mkExportAvails :: ModuleName -> Bool -> GlobalRdrEnv -> [AvailInfo] -> ExportAvails
+mkExportAvails mod_name unqual_imp gbl_env avails
+ = (mod_avail_env, entity_avail_env)
+ where
+ mod_avail_env = unitFM mod_name unqual_avails
- -- Delete things that are hidden
- name_env2 = foldl del_avail name_env1 hides
+ -- 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
- -- Create the export-availability info
- export_avails = mkExportAvails qual_mod unqual_imp name_env2 avails
- in
- returnRn (name_env2, export_avails)
+ unqual_avails | not unqual_imp = [] -- Short cut when no unqualified imports
+ | otherwise = mapMaybe prune avails
- where
- qual_mod = case as_mod of
- Nothing -> this_mod
- Just another_name -> another_name
-
- add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv
- add_avail env avail = foldl add_name env (availNames avail)
-
- add_name env name
- | unqual_imp = env2
- | otherwise = env1
- where
- env1 = addOneToGlobalRdrEnv env (mkRdrQual qual_mod occ) better_name
- env2 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) better_name
- occ = nameOccName name
- better_name = improve_prov name
-
- del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names
- where
- rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail)
+ prune (Avail n) | unqual_in_scope n = Just (Avail n)
+ prune (Avail n) | otherwise = Nothing
+ prune (AvailTC n ns) | null uqs = Nothing
+ | otherwise = Just (AvailTC n uqs)
+ where
+ uqs = filter unqual_in_scope ns
+
+ unqual_in_scope n = unQualInScope gbl_env n
+
+ entity_avail_env = listToUFM [ (name,avail) | avail <- avails,
+ name <- availNames avail]
+
+plusExportAvails :: ExportAvails -> ExportAvails -> ExportAvails
+plusExportAvails (m1, e1) (m2, e2)
+ = (plusFM_C (++) m1 m2, plusAvailEnv e1 e2)
+ -- ToDo: wasteful: we do this once for each constructor!
\end{code}
%************************************************************************
%* *
-\subsection{Export list processing
+\subsection{Export list processing}
%* *
%************************************************************************
Processing the export list.
-You might think that we should record things that appear in the export list as
-``occurrences'' (using addOccurrenceName), but you'd be wrong. We do check (here)
-that they are in scope, but there is no need to slurp in their actual declaration
-(which is what addOccurrenceName forces). Indeed, doing so would big trouble when
-compiling PrelBase, because it re-exports GHC, which includes takeMVar#, whose type
-includes ConcBase.StateAndSynchVar#, and so on...
+You might think that we should record things that appear in the export list
+as ``occurrences'' (using @addOccurrenceName@), but you'd be wrong.
+We do check (here) that they are in scope,
+but there is no need to slurp in their actual declaration
+(which is what @addOccurrenceName@ forces).
+
+Indeed, doing so would big trouble when
+compiling @PrelBase@, because it re-exports @GHC@, which includes @takeMVar#@,
+whose type includes @ConcBase.StateAndSynchVar#@, and so on...
\begin{code}
type ExportAccum -- The type of the accumulating parameter of
-- the main worker function in exportsFromAvail
= ([ModuleName], -- 'module M's seen so far
ExportOccMap, -- Tracks exported occurrence names
- NameEnv AvailInfo) -- The accumulated exported stuff, kept in an env
+ AvailEnv) -- The accumulated exported stuff, kept in an env
-- so we can common-up related AvailInfos
type ExportOccMap = FiniteMap OccName (Name, RdrNameIE)
= exportsFromAvail this_mod true_exports export_avails global_name_env
where
true_exports = Just $ if this_mod == mAIN_Name
- then [IEVar main_RDR]
+ then [IEVar main_RDR_Unqual]
-- export Main.main *only* unless otherwise specified,
else [IEModuleContents this_mod]
-- but for all other modules export everything.
exportsFromAvail this_mod (Just export_items)
(mod_avail_env, entity_avail_env)
global_name_env
- = foldlRn exports_from_item
- ([], emptyFM, emptyNameEnv) export_items `thenRn` \ (_, _, export_avail_map) ->
+ = doptRn Opt_WarnDuplicateExports `thenRn` \ warn_dup_exports ->
+ foldlRn (exports_from_item warn_dup_exports)
+ ([], emptyFM, emptyAvailEnv) export_items
+ `thenRn` \ (_, _, export_avail_map) ->
let
export_avails :: [AvailInfo]
export_avails = nameEnvElts export_avail_map
returnRn export_avails
where
- exports_from_item :: ExportAccum -> RdrNameIE -> RnMG ExportAccum
+ exports_from_item :: Bool -> ExportAccum -> RdrNameIE -> RnMG ExportAccum
- exports_from_item acc@(mods, occs, avails) ie@(IEModuleContents mod)
+ exports_from_item warn_dups acc@(mods, occs, avails) ie@(IEModuleContents mod)
| mod `elem` mods -- Duplicate export of M
- = warnCheckRn opt_WarnDuplicateExports
- (dupModuleExport mod) `thenRn_`
+ = warnCheckRn warn_dups (dupModuleExport mod) `thenRn_`
returnRn acc
| otherwise
= case lookupFM mod_avail_env mod of
Nothing -> failWithRn acc (modExportErr mod)
- Just mod_avails -> foldlRn (check_occs ie) occs mod_avails `thenRn` \ occs' ->
+ Just mod_avails -> foldlRn (check_occs ie) occs mod_avails
+ `thenRn` \ occs' ->
let
- avails' = foldl add_avail avails mod_avails
+ avails' = foldl addAvail avails mod_avails
in
returnRn (mod:mods, occs', avails')
- exports_from_item acc@(mods, occs, avails) ie
- | not (maybeToBool maybe_in_scope)
- = failWithRn acc (unknownNameErr (ieName ie))
+ exports_from_item warn_dups acc@(mods, occs, avails) ie
+ = lookupSrcName global_name_env (ieName ie) `thenRn` \ name ->
- | not (null dup_names)
- = addNameClashErrRn rdr_name (name:dup_names) `thenRn_`
- returnRn acc
+ -- See what's available in the current environment
+ case lookupUFM entity_avail_env name of {
+ Nothing -> -- Presumably this happens because lookupSrcName didn't find
+ -- the name and returned an unboundName, which won't be in
+ -- the entity_avail_env, of course
+ WARN( not (isUnboundName name), ppr name )
+ returnRn acc ;
-#ifdef DEBUG
- -- I can't see why this should ever happen; if the thing is in scope
- -- at all it ought to have some availability
- | not (maybeToBool maybe_avail)
- = pprTrace "exportsFromAvail: curious Nothing:" (ppr name)
- returnRn acc
-#endif
+ Just avail ->
+
+ -- Filter out the bits we want
+ case filterAvail ie avail of {
+ Nothing -> -- Not enough availability
+ failWithRn acc (exportItemErr ie) ;
- | not enough_avail
- = failWithRn acc (exportItemErr ie)
+ Just export_avail ->
+
+ -- Phew! It's OK! Now to check the occurrence stuff!
+ warnCheckRn (ok_item ie avail) (dodgyExportWarn ie) `thenRn_`
+ check_occs ie occs export_avail `thenRn` \ occs' ->
+ returnRn (mods, occs', addAvail avails export_avail)
+ }}
- | otherwise -- Phew! It's OK! Now to check the occurrence stuff!
- = check_occs ie occs export_avail `thenRn` \ occs' ->
- returnRn (mods, occs', add_avail avails export_avail)
- where
- rdr_name = ieName ie
- maybe_in_scope = lookupFM global_name_env rdr_name
- Just (name:dup_names) = maybe_in_scope
- maybe_avail = lookupUFM entity_avail_env name
- Just avail = maybe_avail
- maybe_export_avail = filterAvail ie avail
- enough_avail = maybeToBool maybe_export_avail
- Just export_avail = maybe_export_avail
-add_avail avails avail = addToNameEnv_C plusAvail avails (availName avail) avail
+ok_item (IEThingAll _) (AvailTC _ [n]) = False
+ -- This occurs when you import T(..), but
+ -- only export T abstractly. The single [n]
+ -- in the AvailTC is the type or class itself
+ok_item _ _ = True
check_occs :: RdrNameIE -> ExportOccMap -> AvailInfo -> RnMG ExportOccMap
check_occs ie occs avail
- = foldlRn check occs (availNames avail)
+ = doptRn Opt_WarnDuplicateExports `thenRn` \ warn_dup_exports ->
+ foldlRn (check warn_dup_exports) occs (availNames avail)
where
- check occs name
+ check warn_dup occs name
= case lookupFM occs name_occ of
Nothing -> returnRn (addToFM occs name_occ (name, ie))
Just (name', ie')
| name == name' -> -- Duplicate export
- warnCheckRn opt_WarnDuplicateExports
- (dupExportWarn name_occ ie ie') `thenRn_`
- returnRn occs
+ warnCheckRn warn_dup
+ (dupExportWarn name_occ ie ie')
+ `thenRn_` returnRn occs
| otherwise -> -- Same occ name but different names: an error
failWithRn occs (exportClashErr name_occ ie ie')
where
name_occ = nameOccName name
-
-mk_export_fn :: NameSet -> (Name -> ExportFlag)
-mk_export_fn exported_names
- = \name -> if name `elemNameSet` exported_names
- then Exported
- else NotExported
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-badImportItemErr mod ie
- = sep [ptext SLIT("Module"), quotes (pprModuleName mod),
+badImportItemErr mod from ie
+ = sep [ptext SLIT("Module"), quotes (ppr mod), source_import,
ptext SLIT("does not export"), quotes (ppr ie)]
-
-dodgyImportWarn mod (IEThingAll tc)
- = sep [ptext SLIT("Module") <+> quotes (pprModuleName mod) <+> ptext SLIT("exports") <+> quotes (ppr tc),
- ptext SLIT("with no constructors/class operations;"),
- ptext SLIT("yet it is imported with a (..)")]
-
+ where
+ source_import = case from of
+ ImportByUserSource -> ptext SLIT("(hi-boot interface)")
+ other -> empty
+
+dodgyImportWarn mod item = dodgyMsg (ptext SLIT("import")) item
+dodgyExportWarn item = dodgyMsg (ptext SLIT("export")) item
+
+dodgyMsg kind item@(IEThingAll tc)
+ = sep [ ptext SLIT("The") <+> kind <+> ptext SLIT("item") <+> quotes (ppr item),
+ 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") ]
+
modExportErr mod
- = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (pprModuleName mod)]
+ = hsep [ ptext SLIT("Unknown module in export list: module"), quotes (ppr mod)]
exportItemErr export_item
- = sep [ ptext SLIT("Bad export item"), quotes (ppr 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") ]
exportClashErr occ_name ie1 ie2
- = hsep [ptext SLIT("The export items"), quotes (ppr ie1), ptext SLIT("and"), quotes (ppr ie2),
- ptext SLIT("create conflicting exports for"), quotes (ppr occ_name)]
+ = hsep [ptext SLIT("The export items"), quotes (ppr ie1)
+ ,ptext SLIT("and"), quotes (ppr ie2)
+ ,ptext SLIT("create conflicting exports for"), quotes (ppr occ_name)]
dupDeclErr (n:ns)
= vcat [ptext SLIT("Multiple declarations of") <+> quotes (ppr n),
- nest 4 (vcat (map pp sorted_ns))]
+ nest 4 (vcat (map ppr sorted_locs))]
where
- sorted_ns = sortLt occ'ed_before (n:ns)
-
- occ'ed_before a b = LT == compare (getSrcLoc a) (getSrcLoc b)
-
- pp n = pprProvenance (getNameProvenance n)
+ sorted_locs = sortLt occ'ed_before (map nameSrcLoc (n:ns))
+ occ'ed_before a b = LT == compare a b
dupExportWarn occ_name ie1 ie2
= hsep [quotes (ppr occ_name),
dupModuleExport mod
= hsep [ptext SLIT("Duplicate"),
- quotes (ptext SLIT("Module") <+> pprModuleName mod),
+ quotes (ptext SLIT("Module") <+> ppr mod),
ptext SLIT("in export list")]
-unusedFixityDecl rdr_name fixity
- = hsep [ptext SLIT("Unused fixity declaration for"), quotes (ppr rdr_name)]
-
-dupFixityDecl rdr_name loc1 loc2
- = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
- ptext SLIT("at ") <+> ppr loc1,
- ptext SLIT("and") <+> ppr loc2]
-
+moduleDeprec mod txt
+ = sep [ ptext SLIT("Module") <+> quotes (ppr mod) <+> ptext SLIT("is deprecated:"),
+ nest 4 (ppr txt) ]
\end{code}