\begin{code}
module RnNames (
- getGlobalNames
+ getGlobalNames, exportsFromAvail
) where
#include "HsVersions.h"
import HsSyn ( HsModule(..), HsDecl(..), IE(..), ieName, ImportDecl(..),
ForeignDecl(..), ForKind(..), isDynamicExtName,
- collectTopBinders
+ collectLocatedHsBinders
)
import RdrHsSyn ( RdrNameIE, RdrNameImportDecl,
RdrNameHsModule, RdrNameHsDecl
)
-import RnIfaces ( getInterfaceExports, recordLocalSlurps )
-import RnHiFiles ( getTyClDeclBinders )
+import RnIfaces ( recordLocalSlurps )
+import RnHiFiles ( getTyClDeclBinders, loadInterface )
import RnEnv
import RnMonad
import FiniteMap
-import PrelNames ( pRELUDE_Name, mAIN_Name, main_RDR )
+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, nameSrcLoc,
- setLocalNameSort, nameOccName, nameEnvElts )
+import Name ( Name, nameSrcLoc, nameOccName, nameEnvElts )
import HscTypes ( Provenance(..), ImportReason(..), GlobalRdrEnv,
- GenAvailInfo(..), AvailInfo, Avails, AvailEnv )
-import RdrName ( RdrName, rdrNameOcc, setRdrNameOcc, mkRdrQual, mkRdrUnqual )
+ GenAvailInfo(..), AvailInfo, Avails, AvailEnv,
+ Deprecations(..), ModIface(..)
+ )
+import RdrName ( rdrNameOcc, setRdrNameOcc )
import OccName ( setOccNameSpace, dataName )
import NameSet ( elemNameSet, emptyNameSet )
import Outputable
getGlobalNames :: Module -> RdrNameHsModule
-> RnMG (GlobalRdrEnv, -- Maps all in-scope things
GlobalRdrEnv, -- Maps just *local* things
- Avails, -- The exported stuff
- AvailEnv) -- Maps a name to its parent AvailInfo
- -- Just for in-scope things only
-
-getGlobalNames this_mod (HsModule _ _ exports imports decls _ mod_loc)
- = -- These two fix-loops are to get the right
- -- provenance information into a Name
- fixRn ( \ ~(rec_gbl_env, _, rec_export_avails, _) ->
-
- let
- rec_unqual_fn :: Name -> Bool -- Is this chap in scope unqualified?
- rec_unqual_fn = unQualInScope rec_gbl_env
+ ExportAvails) -- The exported stuff
- rec_exp_fn :: Name -> Bool
- rec_exp_fn = mk_export_fn (availsToNameSet rec_export_avails)
- in
-
- -- 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
is_source_import (ImportDecl _ ImportByUserSource _ _ _ _) = True
is_source_import other = False
- get_imports = importsFromImportDecl this_mod_name rec_unqual_fn
+ get_imports = importsFromImportDecl this_mod_name
in
mapAndUnzipRn get_imports ordinary `thenRn` \ (imp_gbl_envs1, imp_avails_s1) ->
mapAndUnzipRn get_imports source `thenRn` \ (imp_gbl_envs2, imp_avails_s2) ->
all_avails :: ExportAvails
all_avails = foldr plusExportAvails local_mod_avails (imp_avails_s2 ++ imp_avails_s1)
-
- (_, global_avail_env) = all_avails
in
- -- PROCESS EXPORT LIST (but not if we've had errors already)
- checkErrsRn `thenRn` \ no_errs_so_far ->
- (if no_errs_so_far then
- exportsFromAvail this_mod_name exports all_avails gbl_env
- else
- returnRn []
- ) `thenRn` \ export_avails ->
-
-- ALL DONE
- returnRn (gbl_env, local_gbl_env, export_avails, global_avail_env)
- )
+ returnRn (gbl_env, local_gbl_env, all_avails)
where
this_mod_name = moduleName this_mod
\begin{code}
importsFromImportDecl :: ModuleName
- -> (Name -> Bool) -- OK to omit qualifier
-> RdrNameImportDecl
-> RnMG (GlobalRdrEnv,
ExportAvails)
-importsFromImportDecl this_mod_name 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_by_module) ->
-
- if null avails_by_module then
- -- If there's an error in getInterfaceExports, (e.g. interface
- -- file not found) we get lots of spurious errors from 'filterImports'
- returnRn (emptyRdrEnv, mkEmptyExportAvails imp_mod_name)
- else
+ 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,
-- then you'll get a 'B does not export AType' message. Oh well.
in
- filterImports imp_mod_name import_spec avails `thenRn` \ (filtered_avails, hides, explicits) ->
+ 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
+
+ -- 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) ->
let
- mk_provenance name = NonLocalDef (UserImport imp_mod iloc (name `elemNameSet` explicits))
- (is_unqual name)
+ 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
- mk_provenance
- filtered_avails
+ returnRn (gbl_env, exports)
\end{code}
\begin{code}
-importsFromLocalDecls this_mod rec_exp_fn decls
- = mapRn (getLocalDeclBinders this_mod rec_exp_fn) 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
(_, 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
- recordLocalSlurps avails `thenRn_`
- -- Build the environment
- qualifyImports (moduleName this_mod)
- True -- Want unqualified names
- Nothing -- no 'as M'
- [] -- Hide nothing
- (\n -> LocalDef) -- Provenance is local
- avails
+ -- 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
- -> (Name -> Bool) -- Whether exported
- -> RdrNameHsDecl -> RnMG Avails
-getLocalDeclBinders mod rec_exp_fn (TyClD tycl_decl)
+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 ->
+ getTyClDeclBinders mod tycl_decl `thenRn` \ (avail, sys_names) ->
+
+ -- Record that the system names are available
+ recordLocalSlurps (mkNameSet sys_names) `thenRn_`
returnRn [avail]
-getLocalDeclBinders mod rec_exp_fn (ValD binds)
- = mapRn (newLocalBinder mod rec_exp_fn)
- (bagToList (collectTopBinders binds))
+getLocalDeclBinders mod (ValD binds)
+ = mapRn new (collectLocatedHsBinders binds) `thenRn` \ avails ->
+ returnRn avails
+ where
+ new (rdr_name, loc) = newTopBinder mod rdr_name loc `thenRn` \ name ->
+ returnRn (Avail name)
-getLocalDeclBinders mod rec_exp_fn (ForD (ForeignDecl nm kind _ ext_nm _ loc))
+getLocalDeclBinders mod (ForD (ForeignDecl nm kind _ ext_nm _ loc))
| binds_haskell_name kind
- = newLocalBinder mod rec_exp_fn (nm, loc) `thenRn` \ avail ->
- returnRn [avail]
+ = newTopBinder mod nm loc `thenRn` \ name ->
+ returnRn [Avail name]
| otherwise -- a foreign export
= returnRn []
binds_haskell_name FoLabel = True
binds_haskell_name FoExport = isDynamicExtName ext_nm
-getLocalDeclBinders mod rec_exp_fn (FixD _) = returnRn []
-getLocalDeclBinders mod rec_exp_fn (DeprecD _) = returnRn []
-getLocalDeclBinders mod rec_exp_fn (DefD _) = returnRn []
-getLocalDeclBinders mod rec_exp_fn (InstD _) = returnRn []
-getLocalDeclBinders mod rec_exp_fn (RuleD _) = returnRn []
-
----------------------------
-newLocalBinder mod rec_exp_fn (rdr_name, loc)
- = -- Generate a local name, and with a suitable export indicator
- newTopBinder mod rdr_name loc `thenRn` \ name ->
- returnRn (Avail (setLocalNameSort name (rec_exp_fn name)))
+getLocalDeclBinders mod (FixD _) = returnRn []
+getLocalDeclBinders mod (DeprecD _) = returnRn []
+getLocalDeclBinders mod (DefD _) = returnRn []
+getLocalDeclBinders mod (InstD _) = returnRn []
+getLocalDeclBinders mod (RuleD _) = returnRn []
\end{code}
\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
-- 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)) total_avails
+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
-- they won't make any difference because naked entities like T
-- in an import list map to TcOccs, not VarOccs.
- bale_out item = addErrRn (badImportItemErr mod item) `thenRn_`
+ bale_out item = addErrRn (badImportItemErr mod from item) `thenRn_`
returnRn []
get_item item@(IEModuleContents _) = bale_out item
%* *
%************************************************************************
-@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
- -> (Name -> Provenance)
- -> Avails -- Whats imported and how
- -> RnMG (GlobalRdrEnv, ExportAvails)
-
-qualifyImports this_mod unqual_imp as_mod hides mk_provenance avails
- =
- -- 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
-
- -- Delete things that are hidden
- name_env2 = foldl del_avail name_env1 hides
-
- -- Create the export-availability info
- export_avails = mkExportAvails qual_mod unqual_imp name_env2 avails
- in
- returnRn (name_env2, export_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) (name,prov)
- env2 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) (name,prov)
- occ = nameOccName name
- prov = mk_provenance name
-
- del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names
- where
- rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail)
-
-
mkEmptyExportAvails :: ModuleName -> ExportAvails
mkEmptyExportAvails mod_name = (unitFM mod_name [], emptyUFM)
mkExportAvails :: ModuleName -> Bool -> GlobalRdrEnv -> [AvailInfo] -> ExportAvails
-mkExportAvails mod_name unqual_imp name_env avails
+mkExportAvails mod_name unqual_imp gbl_env avails
= (mod_avail_env, entity_avail_env)
where
mod_avail_env = unitFM mod_name unqual_avails
where
uqs = filter unqual_in_scope ns
- unqual_in_scope n = unQualInScope name_env n
+ unqual_in_scope n = unQualInScope gbl_env n
entity_avail_env = listToUFM [ (name,avail) | avail <- avails,
name <- availNames avail]
= 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.
returnRn (mod:mods, occs', avails')
exports_from_item warn_dups acc@(mods, occs, avails) ie
- | not (maybeToBool maybe_in_scope)
- = failWithRn acc (unknownNameErr (ieName ie))
-
- | not (null dup_names)
- = addNameClashErrRn rdr_name ((name,prov):dup_names) `thenRn_`
- returnRn acc
+ = lookupSrcName global_name_env (ieName ie) `thenRn` \ name ->
-#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
+ -- 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 ;
- | not enough_avail
- = failWithRn acc (exportItemErr ie)
+ Just avail ->
- | otherwise -- Phew! It's OK! Now to check the occurrence stuff!
+ -- Filter out the bits we want
+ case filterAvail ie avail of {
+ Nothing -> -- Not enough availability
+ failWithRn acc (exportItemErr ie) ;
+ Just export_avail ->
- = warnCheckRn (ok_item ie avail) (dodgyExportWarn ie) `thenRn_`
+ -- 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)
+ }}
+
+
- where
- rdr_name = ieName ie
- maybe_in_scope = lookupFM global_name_env rdr_name
- Just ((name,prov):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
-
- 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
+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
failWithRn occs (exportClashErr name_occ ie ie')
where
name_occ = nameOccName name
-
-mk_export_fn :: NameSet -> (Name -> Bool) -- True => exported
-mk_export_fn exported_names = \name -> name `elemNameSet` exported_names
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-badImportItemErr mod ie
- = sep [ptext SLIT("Module"), quotes (ppr mod),
+badImportItemErr mod from ie
+ = sep [ptext SLIT("Module"), quotes (ppr mod), source_import,
ptext SLIT("does not export"), quotes (ppr ie)]
+ 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
= hsep [ptext SLIT("Duplicate"),
quotes (ptext SLIT("Module") <+> ppr mod),
ptext SLIT("in export list")]
+
+moduleDeprec mod txt
+ = sep [ ptext SLIT("Module") <+> quotes (ppr mod) <+> ptext SLIT("is deprecated:"),
+ nest 4 (ppr txt) ]
\end{code}