%
-% (c) The GRASP Project, Glasgow University, 1992-1996
+% (c) The GRASP Project, Glasgow University, 1992-1998
%
\section[Rename]{Renaming and dependency analysis passes}
\begin{code}
-#include "HsVersions.h"
-
module Rename ( renameModule ) where
-#if __GLASGOW_HASKELL__ <= 201
-import PreludeGlaST ( thenPrimIO )
-#else
-import GlaExts
-import IO
-#endif
-
-IMP_Ubiq()
-IMPORT_1_3(List(partition))
+#include "HsVersions.h"
import HsSyn
-import RdrHsSyn ( RdrName(..), SYN_IE(RdrNameHsModule), SYN_IE(RdrNameImportDecl) )
-import RnHsSyn ( SYN_IE(RenamedHsModule), SYN_IE(RenamedHsDecl), extractHsTyNames )
+import RdrHsSyn ( RdrName(..), RdrNameHsModule )
+import RnHsSyn ( RenamedHsModule, RenamedHsDecl, extractHsTyNames )
-import CmdLineOpts ( opt_HiMap, opt_WarnNameShadowing, opt_D_show_rn_trace,
+import CmdLineOpts ( opt_HiMap, opt_D_show_rn_trace,
opt_D_dump_rn, opt_D_show_rn_stats,
- opt_D_show_unused_imports, opt_PprUserLength
+ opt_WarnUnusedBinds, opt_WarnUnusedImports
)
import RnMonad
import RnNames ( getGlobalNames )
getDeferredDataDecls,
mkSearchPath, getSlurpedNames, getRnStats
)
-import RnEnv ( availsToNameSet, addAvailToNameSet,
- addImplicitOccsRn, lookupImplicitOccRn )
-import Id ( GenId {- instance NamedThing -} )
-import Name ( Name, Provenance, ExportFlag(..), isLocallyDefined,
- NameSet(..), elemNameSet, mkNameSet, unionNameSets,
- nameSetToList, minusNameSet, NamedThing(..),
+import RnEnv ( addImplicitOccsRn, availNames )
+import Name ( Name, isLocallyDefined,
+ NamedThing(..),
nameModule, pprModule, pprOccName, nameOccName
)
-import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon )
+import NameSet
import TyCon ( TyCon )
-import PrelMods ( mAIN, gHC_MAIN )
-import PrelInfo ( ioTyCon_NAME )
-import ErrUtils ( SYN_IE(Error), SYN_IE(Warning), pprBagOfErrors,
+import PrelMods ( mAIN, pREL_MAIN )
+import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon )
+import PrelInfo ( ioTyCon_NAME, thinAirIdNames )
+import ErrUtils ( pprBagOfErrors, pprBagOfWarnings,
doIfSet, dumpIfSet, ghcExit
)
-import FiniteMap ( emptyFM, eltsFM, fmToList, addToFM, FiniteMap )
-import Pretty
-import Outputable ( Outputable(..), PprStyle(..),
- pprErrorsStyle, pprDumpStyle, printErrs
- )
import Bag ( isEmptyBag )
-import Util ( cmpPString, equivClasses, panic, assertPanic, pprTrace )
-#if __GLASGOW_HASKELL__ >= 202
-import UniqSupply
-#endif
+import FiniteMap ( fmToList, delListFromFM )
+import UniqSupply ( UniqSupply )
+import Util ( equivClasses )
+import Maybes ( maybeToBool )
+import Outputable
\end{code}
\begin{code}
renameModule :: UniqSupply
-> RdrNameHsModule
- -> IO (Maybe (RenamedHsModule, -- Output, after renaming
- InterfaceDetails, -- Interface; for interface file generatino
- RnNameSupply, -- Final env; for renaming derivings
- [Module])) -- Imported modules; for profiling
+ -> IO (Maybe
+ ( RenamedHsModule -- Output, after renaming
+ , InterfaceDetails -- Interface; for interface file generatino
+ , RnNameSupply -- Final env; for renaming derivings
+ , [Module] -- Imported modules; for profiling
+ ))
renameModule us this_mod@(HsModule mod_name vers exports imports fixities local_decls loc)
= -- Initialise the renamer monad
-- Check for warnings
doIfSet (not (isEmptyBag rn_warns_bag))
- (print_errs rn_warns_bag) >>
+ (printErrs (pprBagOfWarnings rn_warns_bag)) >>
-- Check for errors; exit if so
doIfSet (not (isEmptyBag rn_errs_bag))
- (print_errs rn_errs_bag >>
+ (printErrs (pprBagOfErrors rn_errs_bag) >>
ghcExit 1
) >>
Nothing -> return ()
Just results@(rn_mod, _, _, _)
-> dumpIfSet opt_D_dump_rn "Renamer:"
- (ppr pprDumpStyle rn_mod)
+ (ppr rn_mod)
) >>
-- Return results
return maybe_rn_stuff
-
-
-print_errs errs = printErrs (pprBagOfErrors pprErrorsStyle errs)
\end{code}
\begin{code}
rename this_mod@(HsModule mod_name vers exports imports fixities local_decls loc)
- = -- FIND THE GLOBAL NAME ENVIRONMENT
- getGlobalNames this_mod `thenRn` \ global_name_info ->
-
- case global_name_info of {
- Nothing -> -- Everything is up to date; no need to recompile further
- rnStats [] `thenRn_`
- returnRn Nothing ;
-
- -- Otherwise, just carry on
- Just (export_env, rn_env, explicit_names) ->
+ = -- FIND THE GLOBAL NAME ENVIRONMENT
+ getGlobalNames this_mod `thenRn` \ maybe_stuff ->
+
+ -- CHECK FOR EARLY EXIT
+ if not (maybeToBool maybe_stuff) then
+ -- Everything is up to date; no need to recompile further
+ rnStats [] `thenRn_`
+ returnRn Nothing
+ else
+ let
+ Just (export_env, rn_env, explicit_info, print_unqual) = maybe_stuff
+ in
-- RENAME THE SOURCE
initRnMS rn_env mod_name SourceMode (
) `thenRn` \ rn_local_decls ->
-- SLURP IN ALL THE NEEDED DECLARATIONS
- slurpDecls rn_local_decls `thenRn` \ rn_all_decls ->
+ slurpDecls print_unqual rn_local_decls `thenRn` \ rn_all_decls ->
+ -- EXIT IF ERRORS FOUND
+ checkErrsRn `thenRn` \ no_errs_so_far ->
+ if not no_errs_so_far then
+ -- Found errors already, so exit now
+ rnStats [] `thenRn_`
+ returnRn Nothing
+ else
-- GENERATE THE VERSION/USAGE INFO
getImportVersions mod_name exports `thenRn` \ import_versions ->
getNameSupplyRn `thenRn` \ name_supply ->
-- REPORT UNUSED NAMES
- reportUnusedNames explicit_names `thenRn_`
+ reportUnusedNames export_env explicit_info `thenRn_`
-- GENERATE THE SPECIAL-INSTANCE MODULE LIST
-- The "special instance" modules are those modules that contain instance
(import_versions, export_env, special_inst_mods),
name_supply,
import_mods))
- }
where
trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing
trashed_imports = {-trace "rnSource:trashed_imports"-} []
\begin{code}
addImplicits mod_name
- = addImplicitOccsRn (implicit_main ++ default_tys)
+ = addImplicitOccsRn (implicit_main ++ default_tys ++ thinAirIdNames)
where
-- Add occurrences for Int, Double, and (), because they
-- are the types to which ambigious type variables may be defaulted by
- -- the type checker; so they won't every appear explicitly.
+ -- the type checker; so they won't always appear explicitly.
-- [The () one is a GHC extension for defaulting CCall results.]
default_tys = [getName intTyCon, getName doubleTyCon, getName unitTyCon ]
-- Add occurrences for IO or PrimIO
implicit_main | mod_name == mAIN
- || mod_name == gHC_MAIN = [ioTyCon_NAME]
- | otherwise = []
+ || mod_name == pREL_MAIN = [ioTyCon_NAME]
+ | otherwise = []
\end{code}
\begin{code}
-slurpDecls decls
+slurpDecls print_unqual decls
= -- First of all, get all the compulsory decls
slurp_compulsories decls `thenRn` \ decls1 ->
-- Next get the optional ones
- closeDecls Optional decls1 `thenRn` \ decls2 ->
+ closeDecls optional_mode decls1 `thenRn` \ decls2 ->
-- Finally get those deferred data type declarations
- getDeferredDataDecls `thenRn` \ data_decls ->
- mapRn rn_data_decl data_decls `thenRn` \ rn_data_decls ->
+ getDeferredDataDecls `thenRn` \ data_decls ->
+ mapRn (rn_data_decl compulsory_mode) data_decls `thenRn` \ rn_data_decls ->
-- Done
returnRn (rn_data_decls ++ decls2)
where
+ compulsory_mode = InterfaceMode Compulsory print_unqual
+ optional_mode = InterfaceMode Optional print_unqual
+
-- The "slurp_compulsories" function is a loop that alternates
-- between slurping compulsory decls and slurping the instance
-- decls thus made relavant.
-- whose decl we must slurp, which might let in some new instance decls,
-- and so on. Example: instance Foo a => Baz [a] where ...
slurp_compulsories decls
- = closeDecls Compulsory decls `thenRn` \ decls1 ->
+ = closeDecls compulsory_mode decls `thenRn` \ decls1 ->
-- Instance decls still pending?
getImportedInstDecls `thenRn` \ inst_decls ->
else
-- Yes, there are some, so rename them and loop
traceRn (sep [ptext SLIT("Slurped"), int (length inst_decls), ptext SLIT("instance decls")])
- `thenRn_`
- mapRn rn_inst_decl inst_decls `thenRn` \ new_inst_decls ->
+ `thenRn_`
+ mapRn (rn_inst_decl compulsory_mode) inst_decls `thenRn` \ new_inst_decls ->
slurp_compulsories (new_inst_decls ++ decls1)
\end{code}
\begin{code}
-closeDecls :: Necessity
+closeDecls :: RnSMode
-> [RenamedHsDecl] -- Declarations got so far
-> RnMG [RenamedHsDecl] -- input + extra decls slurped
-- The monad includes a list of possibly-unresolved Names
-- This list is empty when closeDecls returns
-closeDecls necessity decls
- = popOccurrenceName necessity `thenRn` \ maybe_unresolved ->
+closeDecls mode decls
+ = popOccurrenceName mode `thenRn` \ maybe_unresolved ->
case maybe_unresolved of
-- No more unresolved names
Nothing -> returnRn decls
-- An unresolved name
- Just name
+ Just name_w_loc
-> -- Slurp its declaration, if any
--- traceRn (sep [ptext SLIT("Considering"), ppr PprDebug name]) `thenRn_`
- importDecl name necessity `thenRn` \ maybe_decl ->
+-- traceRn (sep [ptext SLIT("Considering"), ppr name_w_loc]) `thenRn_`
+ importDecl name_w_loc mode `thenRn` \ maybe_decl ->
case maybe_decl of
-- No declaration... (wired in thing or optional)
- Nothing -> closeDecls necessity decls
+ Nothing -> closeDecls mode decls
-- Found a declaration... rename it
- Just decl -> rn_iface_decl mod_name necessity decl `thenRn` \ new_decl ->
- closeDecls necessity (new_decl : decls)
+ Just decl -> rn_iface_decl mod_name mode decl `thenRn` \ new_decl ->
+ closeDecls mode (new_decl : decls)
where
- mod_name = nameModule name
+ mod_name = nameModule (fst name_w_loc)
-
-rn_iface_decl mod_name necessity decl -- Notice that the rnEnv starts empty
- = initRnMS emptyRnEnv mod_name (InterfaceMode necessity) (rnDecl decl)
+rn_iface_decl mod_name mode decl
+ = initRnMS emptyRnEnv mod_name mode (rnDecl decl)
-rn_inst_decl (mod_name,decl) = rn_iface_decl mod_name Compulsory (InstD decl)
-
-rn_data_decl (tycon_name,ty_decl) = rn_iface_decl mod_name Compulsory (TyD ty_decl)
- where
- mod_name = nameModule tycon_name
+rn_inst_decl mode (mod_name,decl) = rn_iface_decl mod_name mode (InstD decl)
+rn_data_decl mode (tycon_name,ty_decl) = rn_iface_decl mod_name mode (TyD ty_decl)
+ where
+ mod_name = nameModule tycon_name
\end{code}
\begin{code}
-reportUnusedNames explicit_avail_names
- | not opt_D_show_unused_imports
+reportUnusedNames (ExportEnv export_avails _) explicit_info
+ | not (opt_WarnUnusedBinds || opt_WarnUnusedImports)
= returnRn ()
| otherwise
= getSlurpedNames `thenRn` \ slurped_names ->
let
- unused = explicit_avail_names `minusNameSet` slurped_names
- (local_unused, imported_unused) = partition isLocallyDefined (nameSetToList unused)
- imports_by_module = equivClasses cmp imported_unused
- name1 `cmp` name2 = nameModule name1 `_CMP_STRING_` nameModule name2
-
- pp_imp sty = sep [text "For information: the following unqualified imports are unused:",
- nest 4 (vcat (map (pp_group sty) imports_by_module))]
- pp_group sty (n:ns) = sep [hcat [text "Module ", pprModule (PprForUser opt_PprUserLength) (nameModule n), char ':'],
- nest 4 (sep (map (pprOccName sty . nameOccName) (n:ns)))]
-
- pp_local sty = sep [text "For information: the following local top-level definitions are unused:",
- nest 4 (sep (map (pprOccName sty . nameOccName) local_unused))]
- in
- (if null imported_unused
- then returnRn ()
- else addWarnRn pp_imp) `thenRn_`
+ unused_info :: FiniteMap Name HowInScope
+ unused_info = foldl delListFromFM
+ (delListFromFM explicit_info (nameSetToList slurped_names))
+ (map availNames export_avails)
+ unused_list = fmToList unused_info
+
+ groups = filter wanted (equivClasses cmp unused_list)
+ where
+ (name1, his1) `cmp` (name2, his2) = his1 `cmph` his2
+
+ (FromLocalDefn _) `cmph` (FromImportDecl _ _) = LT
+ (FromLocalDefn _) `cmph` (FromLocalDefn _) = EQ
+ (FromImportDecl m1 _) `cmph` (FromImportDecl m2 _) = m1 `compare` m2
+ h1 `cmph` h2 = GT
+
+ wanted ((_,FromImportDecl _ _) : _) = opt_WarnUnusedImports
+ wanted ((_,FromLocalDefn _) : _) = opt_WarnUnusedImports
+
+ pp_imp = sep [text "Warning: the following are unused:",
+ nest 4 (vcat (map pp_group groups))]
+
+ pp_group group = sep [msg <> char ':',
+ nest 4 (sep (map (pprOccName . nameOccName . fst) group))]
+ where
+ his = case group of
+ ((_,his) : _) -> his
+
+ msg = case his of
+ FromImportDecl m _ -> text "Imported from" <+> pprModule m
+ FromLocalDefn _ -> text "Locally defined"
- (if null local_unused
- then returnRn ()
- else addWarnRn pp_local)
+ in
+ if null groups
+ then returnRn ()
+ else addWarnRn pp_imp
rnStats :: [RenamedHsDecl] -> RnMG ()
rnStats all_decls
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