RdrNameHsModule, RdrNameHsDecl
)
import RnIfaces ( getInterfaceExports, getDeclBinders, getDeclSysBinders,
- recordSlurp, checkUpToDate
+ recordLocalSlurps, checkModUsage, findAndReadIface, outOfDate
)
import RnEnv
import RnMonad
import FiniteMap
-import PrelMods
-import PrelInfo ( main_RDR )
+import PrelInfo ( pRELUDE_Name, mAIN_Name, main_RDR )
import UniqFM ( lookupUFM )
import Bag ( bagToList )
-import Maybes ( maybeToBool, catMaybes )
import Module ( ModuleName, mkThisModule, pprModuleName, WhereFrom(..) )
import NameSet
import Name ( Name, ExportFlag(..), ImportReason(..), Provenance(..),
isLocallyDefined, setNameProvenance,
nameOccName, getSrcLoc, pprProvenance, getNameProvenance
)
-import RdrName ( RdrName, rdrNameOcc, setRdrNameOcc, mkRdrQual, mkRdrUnqual, isQual )
+import RdrName ( RdrName, rdrNameOcc, setRdrNameOcc, mkRdrQual, mkRdrUnqual, isQual, isUnqual )
import OccName ( setOccNameSpace, dataName )
import SrcLoc ( SrcLoc )
import NameSet ( elemNameSet, emptyNameSet )
import Outputable
-import Unique ( getUnique )
+import Maybes ( maybeToBool, catMaybes, mapMaybe )
+import UniqFM ( emptyUFM, listToUFM, plusUFM_C )
import Util ( removeDups, equivClassesByUniq, 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
+ -> RnMG (Maybe (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
+ Maybe ParsedIface -- The old interface file, if any
))
-- 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 ( \ ~(Just (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
rec_exp_fn :: Name -> ExportFlag
- rec_exp_fn = mk_export_fn (availsToNameSet rec_exported_avails)
+ rec_exp_fn = mk_export_fn (availsToNameSet rec_export_avails)
in
setModuleRn this_mod $
all_avails :: ExportAvails
all_avails = foldr plusExportAvails local_mod_avails (imp_avails_s2 ++ imp_avails_s1)
+ (_, global_avail_env) = all_avails
in
- -- 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 ->
-
- -- 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
- ]
-
- -- CONSTRUCT RESULTS
- export_mods = case exports of
- Nothing -> []
- Just es -> [mod | IEModuleContents mod <- es, mod /= this_mod]
-
- export_env = ExportEnv exported_avails exported_fixities export_mods
- (_, global_avail_env) = all_avails
- in
- traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts local_fixity_env))) `thenRn_`
-
- returnRn (Just (export_env, gbl_env, local_fixity_env, global_avail_env))
- }
+ -- 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.
+
+ -- Check For eacly exit
+ checkErrsRn `thenRn` \ no_errs_so_far ->
+ if not no_errs_so_far then
+ -- Found errors already, so exit now
+ returnRn Nothing
+ else
+ checkEarlyExit this_mod `thenRn` \ (up_to_date, old_iface) ->
+ if up_to_date then
+ -- Interface files are sufficiently unchanged
+ putDocRn (text "Compilation IS NOT required") `thenRn_`
+ returnRn 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 gbl_env,
+ isQual rdr_name]) `thenRn_`
+
+ -- PROCESS EXPORT LISTS
+ exportsFromAvail this_mod exports all_avails gbl_env `thenRn` \ export_avails ->
+
+
+ -- ALL DONE
+ returnRn (Just (gbl_env, local_gbl_env, export_avails, global_avail_env, old_iface))
+ )
where
- junk_exp_fn = error "RnNames:export_fn"
-
all_imports = prel_imports ++ imports
-- NB: opt_NoImplicitPrelude is slightly different to import Prelude ();
\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 ->
- (if up_to_date
- then putDocRn (text "Compilation IS NOT required")
- else returnRn ()) `thenRn_`
- returnRn up_to_date
+checkEarlyExit mod_name
+ = traceRn (text "Considering whether compilation is required...") `thenRn_`
+
+ -- Read the old interface file, if any, for the module being compiled
+ findAndReadIface doc_str mod_name False {- Not hi-boot -} `thenRn` \ maybe_iface ->
+
+ -- CHECK WHETHER WE HAVE IT ALREADY
+ case maybe_iface of
+ Left err -> -- Old interface file not found, so we'd better bail out
+ traceRn (vcat [ptext SLIT("No old interface file for") <+> pprModuleName mod_name,
+ err]) `thenRn_`
+ returnRn (outOfDate, Nothing)
+
+ Right iface
+ | not opt_SourceUnchanged
+ -> -- Source code changed
+ traceRn (nest 4 (text "source file changed or recompilation check turned off")) `thenRn_`
+ returnRn (False, Just iface)
+
+ | otherwise
+ -> -- Source code unchanged and no errors yet... carry on
+ checkModUsage (pi_usages iface) `thenRn` \ up_to_date ->
+ returnRn (up_to_date, Just iface)
+ where
+ -- Only look in current directory, with suffix .hi
+ doc_str = sep [ptext SLIT("need usage info from"), pprModuleName mod_name]
\end{code}
\begin{code}
returnRn (emptyRdrEnv, mkEmptyExportAvails imp_mod_name)
else
- filterImports imp_mod_name import_spec avails
- `thenRn` \ (filtered_avails, hides, explicits) ->
+ filterImports imp_mod_name import_spec avails `thenRn` \ (filtered_avails, hides, explicits) ->
+ qualifyImports imp_mod_name
+ (not qual_only) -- Maybe want unqualified names
+ as_mod hides
+ (improveAvails imp_mod iloc explicits
+ is_unqual filtered_avails)
+
+
+improveAvails imp_mod iloc explicits is_unqual avails
-- 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
- 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) ->
+ = map improve_avail avails
+ where
+ improve_avail (Avail n) = Avail (improve n)
+ improve_avail (AvailTC n ns) = AvailTC (improve n) (map improve ns)
- returnRn (rdr_name_env, mod_avails)
+ improve name = setNameProvenance name
+ (NonLocalDef (UserImport imp_mod iloc (is_explicit name))
+ (is_unqual name))
+ is_explicit name = name `elemNameSet` explicits
\end{code}
mapRn_ (addErrRn . dupDeclErr) dups `thenRn_`
-- Record that locally-defined things are available
- mapRn_ (recordSlurp Nothing) avails `thenRn_`
+ recordLocalSlurps avails `thenRn_`
-- Build the environment
qualifyImports mod_name
Nothing -- no 'as M'
[] -- Hide nothing
avails
- (\n -> n)
where
mod = mkThisModule mod_name
newLocalName rdr_name loc
- = (if isQual rdr_name then
- qualNameErr (text "the binding for" <+> quotes (ppr rdr_name)) (rdr_name,loc)
- -- There should never be a qualified name in a binding position (except in instance decls)
- -- The parser doesn't check this because the same parser parses instance decls
- else
- returnRn ()) `thenRn_`
-
- newLocalTopBinder mod (rdrNameOcc rdr_name) rec_exp_fn loc
+ = check_unqual rdr_name loc `thenRn_`
+ newTopBinder mod (rdrNameOcc rdr_name) `thenRn` \ name ->
+ returnRn (setNameProvenance name (LocalDef loc (rec_exp_fn name)))
+ -- There should never be a qualified name in a binding position (except in instance decls)
+ -- The parser doesn't check this because the same parser parses instance decls
+ check_unqual rdr_name loc
+ | isUnqual rdr_name = returnRn ()
+ | otherwise = qualNameErr (text "the binding for" <+> quotes (ppr rdr_name))
+ (rdr_name,loc)
getLocalDeclBinders :: (RdrName -> SrcLoc -> RnMG Name) -- New-name function
-> RdrNameHsDecl
-- The getDeclSysBinders is just to get the names of superclass selectors
-- etc, into the cache
new_sys_name rdr_name loc = newImplicitBinder (rdrNameOcc rdr_name) loc
-
-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))
- }}
\end{code}
%************************************************************************
Nothing -> bale_out item
Just avail -> returnRn [(avail, availNames avail)]
- ok_dotdot_item (AvailTC _ [n]) = False
- ok_dotdot_item other = True
-
check_item item
| not (maybeToBool maybe_in_import_avails) ||
not (maybeToBool maybe_filtered_avail)
-> 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
+qualifyImports this_mod unqual_imp as_mod hides avails
=
-- Make the name environment. We're talking about a
-- single module here, so there must be no name clashes.
| 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
+ env1 = addOneToGlobalRdrEnv env (mkRdrQual qual_mod occ) name
+ env2 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) name
+ occ = nameOccName 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
+ = (mod_avail_env, entity_avail_env)
+ where
+ mod_avail_env = unitFM mod_name unqual_avails
+
+ -- 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
+
+ unqual_avails | not unqual_imp = [] -- Short cut when no unqualified imports
+ | otherwise = mapMaybe prune avails
+
+ 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 name_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}
-- 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)
(mod_avail_env, entity_avail_env)
global_name_env
= foldlRn exports_from_item
- ([], emptyFM, emptyNameEnv) export_items `thenRn` \ (_, _, export_avail_map) ->
+ ([], emptyFM, emptyAvailEnv) export_items `thenRn` \ (_, _, export_avail_map) ->
let
export_avails :: [AvailInfo]
export_avails = nameEnvElts export_avail_map
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')
= warnCheckRn (ok_item ie avail) (dodgyExportWarn ie) `thenRn_`
check_occs ie occs export_avail `thenRn` \ occs' ->
- returnRn (mods, occs', add_avail avails export_avail)
+ returnRn (mods, occs', addAvail avails export_avail)
where
rdr_name = ieName ie
-- in the AvailTC is the type or class itself
ok_item _ _ = True
-add_avail avails avail = addToNameEnv_C plusAvail avails (availName avail) avail
-
check_occs :: RdrNameIE -> ExportOccMap -> AvailInfo -> RnMG ExportOccMap
check_occs ie occs avail
= foldlRn check occs (availNames avail)
= hsep [ptext SLIT("Duplicate"),
quotes (ptext SLIT("Module") <+> pprModuleName 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]
\end{code}
projects / ghc-hetmet.git / blobdiff