X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRename.lhs;h=e1381ba88d9836df3aba5411707918068bdd3826;hb=39262efa1c066d97547ac72d8bd16a145ac3f359;hp=0cb23f06dd4c70d7ff9e6d463b957db4b9714261;hpb=87fe9c34612b5149ae8c8307567cb4cf54db82f2;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/Rename.lhs b/ghc/compiler/rename/Rename.lhs index 0cb23f0..e1381ba 100644 --- a/ghc/compiler/rename/Rename.lhs +++ b/ghc/compiler/rename/Rename.lhs @@ -1,5 +1,5 @@ % -% (c) The GRASP Project, Glasgow University, 1992-1996 +% (c) The GRASP Project, Glasgow University, 1992-1998 % \section[Rename]{Renaming and dependency analysis passes} @@ -9,41 +9,49 @@ module Rename ( renameModule ) where #include "HsVersions.h" import HsSyn -import RdrHsSyn ( RdrName(..), RdrNameHsModule, RdrNameImportDecl ) -import RnHsSyn ( RenamedHsModule, RenamedHsDecl, extractHsTyNames ) +import RdrHsSyn ( RdrNameHsModule ) +import RnHsSyn ( RenamedHsModule, RenamedHsDecl, + extractHsTyNames, extractHsCtxtTyNames + ) -import CmdLineOpts ( opt_HiMap, opt_WarnNameShadowing, opt_D_show_rn_trace, - opt_D_dump_rn, opt_D_show_rn_stats, +import CmdLineOpts ( opt_HiMap, opt_D_dump_rn_trace, + opt_D_dump_rn, opt_D_dump_rn_stats, opt_WarnUnusedBinds, opt_WarnUnusedImports ) import RnMonad import RnNames ( getGlobalNames ) -import RnSource ( rnDecl ) -import RnIfaces ( getImportedInstDecls, importDecl, getImportVersions, getSpecialInstModules, - getDeferredDataDecls, - mkSearchPath, getSlurpedNames, getRnStats +import RnSource ( rnSourceDecls, rnDecl ) +import RnIfaces ( getImportedInstDecls, importDecl, getImportVersions, + getImportedRules, loadHomeInterface, getSlurped, removeContext ) -import RnEnv ( availsToNameSet, addAvailToNameSet, - addImplicitOccsRn, lookupImplicitOccRn ) -import Name ( Name, PrintUnqualified, Provenance, ExportFlag(..), - isLocallyDefined, - NameSet(..), elemNameSet, mkNameSet, unionNameSets, - nameSetToList, minusNameSet, NamedThing(..), - nameModule, pprModule, pprOccName, nameOccName +import RnEnv ( availName, availNames, availsToNameSet, + warnUnusedTopNames, mapFvRn, lookupImplicitOccRn, + FreeVars, plusFVs, plusFV, unitFV, emptyFVs, isEmptyFVs ) -import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon ) -import TyCon ( TyCon ) -import PrelMods ( mAIN, pREL_MAIN ) -import PrelInfo ( ioTyCon_NAME ) -import ErrUtils ( pprBagOfErrors, pprBagOfWarnings, - doIfSet, dumpIfSet, ghcExit +import Module ( Module, ModuleName, pprModule, mkSearchPath, mkThisModule ) +import Name ( Name, isLocallyDefined, + NamedThing(..), ImportReason(..), Provenance(..), + pprOccName, nameOccName, + getNameProvenance, + maybeWiredInTyConName, maybeWiredInIdName, isWiredInName ) -import FiniteMap ( emptyFM, eltsFM, fmToList, addToFM, FiniteMap ) -import Bag ( isEmptyBag ) +import Id ( idType ) +import DataCon ( dataConTyCon, dataConType ) +import TyCon ( TyCon, tyConDataCons, isSynTyCon, getSynTyConDefn ) +import RdrName ( RdrName ) +import NameSet +import PrelMods ( mAIN_Name, pREL_MAIN_Name ) +import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon, boolTyCon ) +import PrelInfo ( ioTyCon_NAME, numClass_RDR, thinAirIdNames, derivingOccurrences ) +import Type ( namesOfType, funTyCon ) +import ErrUtils ( printErrorsAndWarnings, dumpIfSet, ghcExit ) +import BasicTypes ( NewOrData(..) ) +import Bag ( isEmptyBag, bagToList ) +import FiniteMap ( fmToList, delListFromFM, addToFM, sizeFM, eltsFM ) import UniqSupply ( UniqSupply ) +import UniqFM ( lookupUFM ) import Util ( equivClasses ) import Maybes ( maybeToBool ) -import List ( partition ) import Outputable \end{code} @@ -52,252 +60,548 @@ import Outputable \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 - -renameModule us this_mod@(HsModule mod_name vers exports imports fixities local_decls loc) + -> IO (Maybe + ( Module + , RenamedHsModule -- Output, after renaming + , InterfaceDetails -- Interface; for interface file generation + , RnNameSupply -- Final env; for renaming derivings + , [ModuleName] -- Imported modules; for profiling + )) + +renameModule us this_mod@(HsModule mod_name vers exports imports local_decls loc) = -- Initialise the renamer monad initRn mod_name us (mkSearchPath opt_HiMap) loc (rename this_mod) >>= - \ (maybe_rn_stuff, rn_errs_bag, rn_warns_bag) -> + \ ((maybe_rn_stuff, dump_action), rn_errs_bag, rn_warns_bag) -> -- Check for warnings - doIfSet (not (isEmptyBag rn_warns_bag)) - (printErrs (pprBagOfWarnings rn_warns_bag)) >> - - -- Check for errors; exit if so - doIfSet (not (isEmptyBag rn_errs_bag)) - (printErrs (pprBagOfErrors rn_errs_bag) >> - ghcExit 1 - ) >> - - -- Dump output, if any - (case maybe_rn_stuff of - Nothing -> return () - Just results@(rn_mod, _, _, _) - -> dumpIfSet opt_D_dump_rn "Renamer:" - (ppr rn_mod) - ) >> + printErrorsAndWarnings rn_errs_bag rn_warns_bag >> + + -- Dump any debugging output + dump_action >> -- Return results - return maybe_rn_stuff + if not (isEmptyBag rn_errs_bag) then + ghcExit 1 >> return Nothing + else + return maybe_rn_stuff \end{code} \begin{code} -rename this_mod@(HsModule mod_name vers exports imports fixities local_decls loc) +rename this_mod@(HsModule mod_name vers _ imports local_decls loc) = -- 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 + rnDump [] [] `thenRn` \ dump_action -> + returnRn (Nothing, dump_action) else let - Just (export_env, rn_env, explicit_names, print_unqual) = maybe_stuff + Just (export_env, gbl_env, fixity_env, global_avail_env) = maybe_stuff in -- RENAME THE SOURCE - initRnMS rn_env mod_name SourceMode ( - addImplicits mod_name `thenRn_` - mapRn rnDecl local_decls - ) `thenRn` \ rn_local_decls -> + initRnMS gbl_env fixity_env SourceMode ( + rnSourceDecls local_decls + ) `thenRn` \ (rn_local_decls, source_fvs) -> -- SLURP IN ALL THE NEEDED DECLARATIONS - slurpDecls print_unqual rn_local_decls `thenRn` \ rn_all_decls -> + implicitFVs mod_name rn_local_decls `thenRn` \ implicit_fvs -> + let + real_source_fvs = implicit_fvs `plusFV` source_fvs + -- It's important to do the "plus" this way round, so that + -- when compiling the prelude, locally-defined (), Bool, etc + -- override the implicit ones. + in + slurpImpDecls real_source_fvs `thenRn` \ rn_imp_decls -> + let + rn_all_decls = rn_imp_decls ++ rn_local_decls + in -- EXIT IF ERRORS FOUND - checkErrsRn `thenRn` \ no_errs_so_far -> + checkErrsRn `thenRn` \ no_errs_so_far -> if not no_errs_so_far then -- Found errors already, so exit now - rnStats [] `thenRn_` - returnRn Nothing + rnDump rn_imp_decls rn_all_decls `thenRn` \ dump_action -> + returnRn (Nothing, dump_action) else -- GENERATE THE VERSION/USAGE INFO - getImportVersions mod_name exports `thenRn` \ import_versions -> - getNameSupplyRn `thenRn` \ name_supply -> + getImportVersions mod_name export_env `thenRn` \ my_usages -> + getNameSupplyRn `thenRn` \ name_supply -> -- REPORT UNUSED NAMES - reportUnusedNames explicit_names `thenRn_` + reportUnusedNames gbl_env global_avail_env + export_env + source_fvs `thenRn_` - -- GENERATE THE SPECIAL-INSTANCE MODULE LIST - -- The "special instance" modules are those modules that contain instance - -- declarations that contain no type constructor or class that was declared - -- in that module. - getSpecialInstModules `thenRn` \ imported_special_inst_mods -> - let - special_inst_decls = [d | InstD d@(InstDecl inst_ty _ _ _ _) <- rn_local_decls, - all (not.isLocallyDefined) (nameSetToList (extractHsTyNames inst_ty)) - ] - special_inst_mods | null special_inst_decls = imported_special_inst_mods - | otherwise = mod_name : imported_special_inst_mods - in - - -- RETURN THE RENAMED MODULE let - import_mods = [mod | ImportDecl mod _ _ _ _ _ <- imports] - + has_orphans = any isOrphanDecl rn_local_decls + direct_import_mods = [mod | ImportDecl mod _ _ _ _ _ <- imports] renamed_module = HsModule mod_name vers - trashed_exports trashed_imports trashed_fixities + trashed_exports trashed_imports rn_all_decls loc in - rnStats rn_all_decls `thenRn_` - returnRn (Just (renamed_module, - (import_versions, export_env, special_inst_mods), - name_supply, - import_mods)) + rnDump rn_imp_decls rn_all_decls `thenRn` \ dump_action -> + returnRn (Just (mkThisModule mod_name, + renamed_module, + (has_orphans, my_usages, export_env), + name_supply, + direct_import_mods), dump_action) where trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing trashed_imports = {-trace "rnSource:trashed_imports"-} [] - trashed_fixities = [] \end{code} -@addImplicits@ forces the renamer to slurp in some things which aren't +@implicitFVs@ forces the renamer to slurp in some things which aren't mentioned explicitly, but which might be needed by the type checker. \begin{code} -addImplicits mod_name - = addImplicitOccsRn (implicit_main ++ default_tys) +implicitFVs mod_name decls + = mapRn lookupImplicitOccRn implicit_occs `thenRn` \ implicit_names -> + returnRn (implicit_main `plusFV` + mkNameSet default_tys `plusFV` + mkNameSet thinAirIdNames `plusFV` + mkNameSet implicit_names) + 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 ] + -- ALSO: funTyCon, since it occurs implicitly everywhere! + -- (we don't want to be bothered with making funTyCon a + -- free var at every function application!) + default_tys = [getName intTyCon, getName doubleTyCon, + getName unitTyCon, getName funTyCon, getName boolTyCon] -- Add occurrences for IO or PrimIO - implicit_main | mod_name == mAIN - || mod_name == pREL_MAIN = [ioTyCon_NAME] - | otherwise = [] + implicit_main | mod_name == mAIN_Name + || mod_name == pREL_MAIN_Name = unitFV ioTyCon_NAME + | otherwise = emptyFVs + + -- Now add extra "occurrences" for things that + -- the deriving mechanism, or defaulting, will later need in order to + -- generate code + implicit_occs = foldr ((++) . get) [] decls + + get (DefD _) = [numClass_RDR] + get (TyClD (TyData _ _ _ _ _ (Just deriv_classes) _ _)) + = concat (map get_deriv deriv_classes) + get other = [] + + get_deriv cls = case lookupUFM derivingOccurrences cls of + Nothing -> [] + Just occs -> occs +\end{code} + +\begin{code} +isOrphanDecl (InstD (InstDecl inst_ty _ _ _ _)) + = not (foldNameSet ((||) . isLocallyDefined) False (extractHsTyNames (removeContext inst_ty))) + -- The 'removeContext' is because of + -- instance Foo a => Baz T where ... + -- The decl is an orphan if Baz and T are both not locally defined, + -- even if Foo *is* locally defined + +isOrphanDecl (RuleD (RuleDecl _ _ _ lhs _ _)) + = check lhs + where + -- At the moment we just check for common LHS forms + -- Expand as necessary. Getting it wrong just means + -- more orphans than necessary + check (HsVar v) = not (isLocallyDefined v) + check (HsApp f a) = check f && check a + check (HsLit _) = False + check (OpApp l o _ r) = check l && check o && check r + check (NegApp e _) = check e + check (HsPar e) = check e + check (SectionL e o) = check e && check o + check (SectionR o e) = check e && check o + + check other = True -- Safe fall through + +isOrphanDecl other = False +\end{code} + + +%********************************************************* +%* * +\subsection{Slurping declarations} +%* * +%********************************************************* + +\begin{code} +------------------------------------------------------- +slurpImpDecls source_fvs + = traceRn (text "slurpImp" <+> fsep (map ppr (nameSetToList source_fvs))) `thenRn_` + + -- The current slurped-set records all local things + getSlurped `thenRn` \ source_binders -> + slurpSourceRefs source_binders source_fvs `thenRn` \ (decls, needed) -> + + -- And finally get everything else + closeDecls decls needed + +------------------------------------------------------- +slurpSourceRefs :: NameSet -- Variables defined in source + -> FreeVars -- Variables referenced in source + -> RnMG ([RenamedHsDecl], + FreeVars) -- Un-satisfied needs +-- The declaration (and hence home module) of each gate has +-- already been loaded + +slurpSourceRefs source_binders source_fvs + = go_outer [] -- Accumulating decls + emptyFVs -- Unsatisfied needs + emptyFVs -- Accumulating gates + (nameSetToList source_fvs) -- Things whose defn hasn't been loaded yet + where + -- The outer loop repeatedly slurps the decls for the current gates + -- and the instance decls + + -- The outer loop is needed because consider + -- instance Foo a => Baz (Maybe a) where ... + -- It may be that @Baz@ and @Maybe@ are used in the source module, + -- but not @Foo@; so we need to chase @Foo@ too. + -- + -- We also need to follow superclass refs. In particular, 'chasing @Foo@' must + -- include actually getting in Foo's class decl + -- class Wib a => Foo a where .. + -- so that its superclasses are discovered. The point is that Wib is a gate too. + -- We do this for tycons too, so that we look through type synonyms. + + go_outer decls fvs all_gates [] + = returnRn (decls, fvs) + + go_outer decls fvs all_gates refs -- refs are not necessarily slurped yet + = traceRn (text "go_outer" <+> ppr refs) `thenRn_` + go_inner decls fvs emptyFVs refs `thenRn` \ (decls1, fvs1, gates1) -> + getImportedInstDecls (all_gates `plusFV` gates1) `thenRn` \ inst_decls -> + rnInstDecls decls1 fvs1 gates1 inst_decls `thenRn` \ (decls2, fvs2, gates2) -> + go_outer decls2 fvs2 (all_gates `plusFV` gates2) + (nameSetToList (gates2 `minusNameSet` all_gates)) + -- Knock out the all_gates because even ifwe don't slurp any new + -- decls we can get some apparently-new gates from wired-in names + + go_inner decls fvs gates [] + = returnRn (decls, fvs, gates) + + go_inner decls fvs gates (wanted_name:refs) + | isWiredInName wanted_name + = load_home wanted_name `thenRn_` + go_inner decls fvs (gates `plusFV` getWiredInGates wanted_name) refs + + | otherwise + = importDecl wanted_name `thenRn` \ maybe_decl -> + case maybe_decl of + Nothing -> go_inner decls fvs gates refs -- No declaration... (already slurped, or local) + Just decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) -> + go_inner (new_decl : decls) + (fvs1 `plusFV` fvs) + (gates `plusFV` getGates source_fvs new_decl) + refs + + -- When we find a wired-in name we must load its + -- home module so that we find any instance decls therein + load_home name + | name `elemNameSet` source_binders = returnRn () + -- When compiling the prelude, a wired-in thing may + -- be defined in this module, in which case we don't + -- want to load its home module! + -- Using 'isLocallyDefined' doesn't work because some of + -- the free variables returned are simply 'listTyCon_Name', + -- with a system provenance. We could look them up every time + -- but that seems a waste. + | otherwise = loadHomeInterface doc name `thenRn_` + returnRn () + where + doc = ptext SLIT("need home module for wired in thing") <+> ppr name + +rnInstDecls decls fvs gates [] + = returnRn (decls, fvs, gates) +rnInstDecls decls fvs gates (d:ds) + = rnIfaceDecl d `thenRn` \ (new_decl, fvs1) -> + rnInstDecls (new_decl:decls) + (fvs1 `plusFV` fvs) + (gates `plusFV` getInstDeclGates new_decl) + ds \end{code} \begin{code} -slurpDecls print_unqual decls - = -- First of all, get all the compulsory decls - slurp_compulsories decls `thenRn` \ decls1 -> +------------------------------------------------------- +-- closeDecls keeps going until the free-var set is empty +closeDecls decls needed + | not (isEmptyFVs needed) + = slurpDecls decls needed `thenRn` \ (decls1, needed1) -> + closeDecls decls1 needed1 + + | otherwise + = getImportedRules `thenRn` \ rule_decls -> + case rule_decls of + [] -> returnRn decls -- No new rules, so we are done + other -> rnIfaceDecls decls emptyFVs rule_decls `thenRn` \ (decls1, needed1) -> + closeDecls decls1 needed1 + + +------------------------------------------------------- +rnIfaceDecls :: [RenamedHsDecl] -> FreeVars + -> [(Module, RdrNameHsDecl)] + -> RnM d ([RenamedHsDecl], FreeVars) +rnIfaceDecls decls fvs [] = returnRn (decls, fvs) +rnIfaceDecls decls fvs (d:ds) = rnIfaceDecl d `thenRn` \ (new_decl, fvs1) -> + rnIfaceDecls (new_decl:decls) (fvs1 `plusFV` fvs) ds + +rnIfaceDecl (mod, decl) = initIfaceRnMS mod (rnDecl decl) + + +------------------------------------------------------- +-- Augment decls with any decls needed by needed. +-- Return also free vars of the new decls (only) +slurpDecls decls needed + = go decls emptyFVs (nameSetToList needed) + where + go decls fvs [] = returnRn (decls, fvs) + go decls fvs (ref:refs) = slurpDecl decls fvs ref `thenRn` \ (decls1, fvs1) -> + go decls1 fvs1 refs + +------------------------------------------------------- +slurpDecl decls fvs wanted_name + = importDecl wanted_name `thenRn` \ maybe_decl -> + case maybe_decl of + -- No declaration... (wired in thing) + Nothing -> returnRn (decls, fvs) + + -- Found a declaration... rename it + Just decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) -> + returnRn (new_decl:decls, fvs1 `plusFV` fvs) +\end{code} + - -- Next get the optional ones - closeDecls optional_mode decls1 `thenRn` \ decls2 -> +%********************************************************* +%* * +\subsection{Extracting the `gates'} +%* * +%********************************************************* - -- Finally get those deferred data type declarations - getDeferredDataDecls `thenRn` \ data_decls -> - mapRn (rn_data_decl compulsory_mode) data_decls `thenRn` \ rn_data_decls -> +When we import a declaration like +\begin{verbatim} + data T = T1 Wibble | T2 Wobble +\end{verbatim} +we don't want to treat @Wibble@ and @Wobble@ as gates +{\em unless} @T1@, @T2@ respectively are mentioned by the user program. +If only @T@ is mentioned +we want only @T@ to be a gate; +that way we don't suck in useless instance +decls for (say) @Eq Wibble@, when they can't possibly be useful. - -- Done - returnRn (rn_data_decls ++ decls2) +@getGates@ takes a newly imported (and renamed) decl, and the free +vars of the source program, and extracts from the decl the gate names. +\begin{code} +getGates source_fvs (SigD (IfaceSig _ ty _ _)) + = extractHsTyNames ty + +getGates source_fvs (TyClD (ClassDecl ctxt cls tvs _ sigs _ _ _ _ _ _)) + = delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) sigs) + (map getTyVarName tvs) + `addOneToNameSet` cls 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. - -- We *must* loop again here. Why? Two reasons: - -- (a) an instance decl will give rise to an unresolved dfun, whose - -- decl we must slurp to get its version number; that's the version - -- number for the whole instance decl. (And its unfolding might mention new - -- unresolved names.) - -- (b) an instance decl might give rise to a new unresolved class, - -- 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_mode decls `thenRn` \ decls1 -> + get (ClassOpSig n _ _ ty _) + | n `elemNameSet` source_fvs = extractHsTyNames ty + | otherwise = emptyFVs + +getGates source_fvs (TyClD (TySynonym tycon tvs ty _)) + = delListFromNameSet (extractHsTyNames ty) + (map getTyVarName tvs) + -- A type synonym type constructor isn't a "gate" for instance decls + +getGates source_fvs (TyClD (TyData _ ctxt tycon tvs cons _ _ _)) + = delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) cons) + (map getTyVarName tvs) + `addOneToNameSet` tycon + where + get (ConDecl n tvs ctxt details _) + | n `elemNameSet` source_fvs + -- If the constructor is method, get fvs from all its fields + = delListFromNameSet (get_details details `plusFV` + extractHsCtxtTyNames ctxt) + (map getTyVarName tvs) + get (ConDecl n tvs ctxt (RecCon fields) _) + -- Even if the constructor isn't mentioned, the fields + -- might be, as selectors. They can't mention existentially + -- bound tyvars (typechecker checks for that) so no need for + -- the deleteListFromNameSet part + = foldr (plusFV . get_field) emptyFVs fields - -- Instance decls still pending? - getImportedInstDecls `thenRn` \ inst_decls -> - if null inst_decls then - -- No, none - returnRn decls1 - 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 compulsory_mode) inst_decls `thenRn` \ new_inst_decls -> - slurp_compulsories (new_inst_decls ++ decls1) + get other_con = emptyFVs + + get_details (VanillaCon tys) = plusFVs (map get_bang tys) + get_details (InfixCon t1 t2) = get_bang t1 `plusFV` get_bang t2 + get_details (RecCon fields) = plusFVs [get_bang t | (_, t) <- fields] + get_details (NewCon t _) = extractHsTyNames t + + get_field (fs,t) | any (`elemNameSet` source_fvs) fs = get_bang t + | otherwise = emptyFVs + + get_bang (Banged t) = extractHsTyNames t + get_bang (Unbanged t) = extractHsTyNames t + get_bang (Unpacked t) = extractHsTyNames t + +getGates source_fvs other_decl = emptyFVs \end{code} +@getWiredInGates@ is just like @getGates@, but it sees a wired-in @Name@ +rather than a declaration. + \begin{code} -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 mode decls - = popOccurrenceName mode `thenRn` \ maybe_unresolved -> - case maybe_unresolved of - - -- No more unresolved names - Nothing -> returnRn decls - - -- An unresolved name - Just name_w_loc - -> -- Slurp its declaration, if any --- 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 mode decls - - -- Found a declaration... rename it - Just decl -> rn_iface_decl mod_name mode decl `thenRn` \ new_decl -> - closeDecls mode (new_decl : decls) - where - mod_name = nameModule (fst name_w_loc) - -rn_iface_decl mod_name mode decl - = initRnMS emptyRnEnv mod_name mode (rnDecl decl) - -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 +getWiredInGates :: Name -> FreeVars +getWiredInGates name -- No classes are wired in + | is_id = getWiredInGates_s (namesOfType (idType the_id)) + | isSynTyCon the_tycon = getWiredInGates_s + (delListFromNameSet (namesOfType ty) (map getName tyvars)) + | otherwise = unitFV name + where + maybe_wired_in_id = maybeWiredInIdName name + is_id = maybeToBool maybe_wired_in_id + maybe_wired_in_tycon = maybeWiredInTyConName name + Just the_id = maybe_wired_in_id + Just the_tycon = maybe_wired_in_tycon + (tyvars,ty) = getSynTyConDefn the_tycon + +getWiredInGates_s names = foldr (plusFV . getWiredInGates) emptyFVs (nameSetToList names) \end{code} \begin{code} -reportUnusedNames explicit_avail_names - = 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 `compare` nameModule name2 - - pp_imp = sep [text "Warning: the following unqualified imports are unused:", - nest 4 (vcat (map pp_group imports_by_module))] - pp_group (n:ns) = sep [hcat [text "Module ", pprModule (nameModule n), char ':'], - nest 4 (sep (map (pprOccName . nameOccName) (n:ns)))] - - pp_local = sep [text "Warning: the following local top-level definitions are unused:", - nest 4 (sep (map (pprOccName . nameOccName) local_unused))] +getInstDeclGates (InstD (InstDecl inst_ty _ _ _ _)) = extractHsTyNames inst_ty +getInstDeclGates other = emptyFVs +\end{code} + + +%********************************************************* +%* * +\subsection{Unused names} +%* * +%********************************************************* + +\begin{code} +reportUnusedNames gbl_env avail_env (ExportEnv export_avails _ _) mentioned_names + = let + used_names = mentioned_names `unionNameSets` availsToNameSet export_avails + + -- Now, a use of C implies a use of T, + -- if C was brought into scope by T(..) or T(C) + really_used_names = used_names `unionNameSets` + mkNameSet [ availName avail + | sub_name <- nameSetToList used_names, + let avail = case lookupNameEnv avail_env sub_name of + Just avail -> avail + Nothing -> WARN( True, text "reportUnusedName: not in avail_env" <+> ppr sub_name ) + Avail sub_name + ] + + defined_names = mkNameSet (concat (rdrEnvElts gbl_env)) + defined_but_not_used = + nameSetToList (defined_names `minusNameSet` really_used_names) + + -- Filter out the ones only defined implicitly + bad_guys = filter reportableUnusedName defined_but_not_used in - (if not opt_WarnUnusedImports || null imported_unused - then returnRn () - else addWarnRn pp_imp) `thenRn_` - - (if not opt_WarnUnusedBinds || null local_unused - then returnRn () - else addWarnRn pp_local) - -rnStats :: [RenamedHsDecl] -> RnMG () -rnStats all_decls - | opt_D_show_rn_trace || - opt_D_show_rn_stats || + warnUnusedTopNames bad_guys + +reportableUnusedName :: Name -> Bool +reportableUnusedName name + = explicitlyImported (getNameProvenance name) + where + explicitlyImported (LocalDef _ _) = True + -- Report unused defns of local vars + explicitlyImported (NonLocalDef (UserImport _ _ expl) _) = expl + -- Report unused explicit imports + explicitlyImported other = False + -- Don't report others + +rnDump :: [RenamedHsDecl] -- Renamed imported decls + -> [RenamedHsDecl] -- Renamed local decls + -> RnMG (IO ()) +rnDump imp_decls decls + | opt_D_dump_rn_trace || + opt_D_dump_rn_stats || opt_D_dump_rn - = getRnStats all_decls `thenRn` \ msg -> - ioToRnMG (printErrs msg) `thenRn_` - returnRn () + = getRnStats imp_decls `thenRn` \ stats_msg -> + + returnRn (printErrs stats_msg >> + dumpIfSet opt_D_dump_rn "Renamer:" (vcat (map ppr decls))) - | otherwise = returnRn () + | otherwise = returnRn (return ()) \end{code} + +%********************************************************* +%* * +\subsection{Statistics} +%* * +%********************************************************* + +\begin{code} +getRnStats :: [RenamedHsDecl] -> RnMG SDoc +getRnStats imported_decls + = getIfacesRn `thenRn` \ ifaces -> + let + n_mods = length [() | (_, _, Just _) <- eltsFM (iImpModInfo ifaces)] + + decls_read = [decl | (_, avail, True, (_,decl)) <- nameEnvElts (iDecls ifaces), + -- Data, newtype, and class decls are in the decls_fm + -- under multiple names; the tycon/class, and each + -- constructor/class op too. + -- The 'True' selects just the 'main' decl + not (isLocallyDefined (availName avail)) + ] + + (cd_rd, dd_rd, nd_rd, sd_rd, vd_rd, _) = count_decls decls_read + (cd_sp, dd_sp, nd_sp, sd_sp, vd_sp, id_sp) = count_decls imported_decls + + unslurped_insts = iInsts ifaces + inst_decls_unslurped = length (bagToList unslurped_insts) + inst_decls_read = id_sp + inst_decls_unslurped + + stats = vcat + [int n_mods <+> text "interfaces read", + hsep [ int cd_sp, text "class decls imported, out of", + int cd_rd, text "read"], + hsep [ int dd_sp, text "data decls imported, out of", + int dd_rd, text "read"], + hsep [ int nd_sp, text "newtype decls imported, out of", + int nd_rd, text "read"], + hsep [int sd_sp, text "type synonym decls imported, out of", + int sd_rd, text "read"], + hsep [int vd_sp, text "value signatures imported, out of", + int vd_rd, text "read"], + hsep [int id_sp, text "instance decls imported, out of", + int inst_decls_read, text "read"], + text "cls dcls slurp" <+> fsep (map (ppr . tyClDeclName) + [d | TyClD d <- imported_decls, isClassDecl d]), + text "cls dcls read" <+> fsep (map (ppr . tyClDeclName) + [d | TyClD d <- decls_read, isClassDecl d])] + in + returnRn (hcat [text "Renamer stats: ", stats]) + +count_decls decls + = (class_decls, + data_decls, + newtype_decls, + syn_decls, + val_decls, + inst_decls) + where + tycl_decls = [d | TyClD d <- decls] + (class_decls, data_decls, newtype_decls, syn_decls) = countTyClDecls tycl_decls + + val_decls = length [() | SigD _ <- decls] + inst_decls = length [() | InstD _ <- decls] +\end{code} +