-%\r
-% (c) The GRASP Project, Glasgow University, 1992-1998\r
-%\r
-\section[Rename]{Renaming and dependency analysis passes}\r
-\r
-\begin{code}\r
-module Rename ( renameModule ) where\r
-\r
-#include "HsVersions.h"\r
-\r
-import HsSyn\r
-import RdrHsSyn ( RdrNameHsModule )\r
-import RnHsSyn ( RenamedHsModule, RenamedHsDecl, \r
- extractHsTyNames, extractHsCtxtTyNames\r
- )\r
-\r
-import CmdLineOpts ( opt_HiMap, opt_D_dump_rn_trace,\r
- opt_D_dump_rn, opt_D_dump_rn_stats,\r
- opt_WarnUnusedBinds, opt_WarnUnusedImports\r
- )\r
-import RnMonad\r
-import RnNames ( getGlobalNames )\r
-import RnSource ( rnSourceDecls, rnDecl )\r
-import RnIfaces ( getImportedInstDecls, importDecl, getImportVersions,\r
- getImportedRules, loadHomeInterface, getSlurped\r
- )\r
-import RnEnv ( availName, availNames, availsToNameSet, \r
- warnUnusedTopNames, mapFvRn,\r
- FreeVars, plusFVs, plusFV, unitFV, emptyFVs, isEmptyFVs\r
- )\r
-import Module ( Module, ModuleName, pprModule, mkSearchPath, mkThisModule )\r
-import Name ( Name, isLocallyDefined,\r
- NamedThing(..), ImportReason(..), Provenance(..),\r
- pprOccName, nameOccName,\r
- getNameProvenance, occNameUserString, \r
- maybeWiredInTyConName, maybeWiredInIdName, isWiredInName\r
- )\r
-import Id ( idType )\r
-import DataCon ( dataConTyCon, dataConType )\r
-import TyCon ( TyCon, tyConDataCons, isSynTyCon, getSynTyConDefn )\r
-import RdrName ( RdrName )\r
-import NameSet\r
-import PrelMods ( mAIN_Name, pREL_MAIN_Name )\r
-import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon, boolTyCon )\r
-import PrelInfo ( ioTyCon_NAME, thinAirIdNames )\r
-import Type ( namesOfType, funTyCon )\r
-import ErrUtils ( pprBagOfErrors, pprBagOfWarnings,\r
- doIfSet, dumpIfSet, ghcExit\r
- )\r
-import BasicTypes ( NewOrData(..) )\r
-import Bag ( isEmptyBag, bagToList )\r
-import FiniteMap ( fmToList, delListFromFM, addToFM, sizeFM, eltsFM )\r
-import UniqSupply ( UniqSupply )\r
-import Util ( equivClasses )\r
-import Maybes ( maybeToBool )\r
-import Outputable\r
-\end{code}\r
-\r
-\r
-\r
-\begin{code}\r
-renameModule :: UniqSupply\r
- -> RdrNameHsModule\r
- -> IO (Maybe \r
- ( Module\r
- , RenamedHsModule -- Output, after renaming\r
- , InterfaceDetails -- Interface; for interface file generation\r
- , RnNameSupply -- Final env; for renaming derivings\r
- , [ModuleName] -- Imported modules; for profiling\r
- ))\r
-\r
-renameModule us this_mod@(HsModule mod_name vers exports imports local_decls loc)\r
- = -- Initialise the renamer monad\r
- initRn mod_name us (mkSearchPath opt_HiMap) loc\r
- (rename this_mod) >>=\r
- \ (maybe_rn_stuff, rn_errs_bag, rn_warns_bag) ->\r
-\r
- -- Check for warnings\r
- doIfSet (not (isEmptyBag rn_warns_bag))\r
- (printErrs (pprBagOfWarnings rn_warns_bag)) >>\r
-\r
- -- Check for errors; exit if so\r
- doIfSet (not (isEmptyBag rn_errs_bag))\r
- (printErrs (pprBagOfErrors rn_errs_bag) >>\r
- ghcExit 1\r
- ) >>\r
-\r
- -- Dump output, if any\r
- (case maybe_rn_stuff of\r
- Nothing -> return ()\r
- Just results@(_, rn_mod, _, _, _)\r
- -> dumpIfSet opt_D_dump_rn "Renamer:"\r
- (ppr rn_mod)\r
- ) >>\r
-\r
- -- Return results\r
- return maybe_rn_stuff\r
-\end{code}\r
-\r
-\r
-\begin{code}\r
-rename this_mod@(HsModule mod_name vers exports imports local_decls loc)\r
- = -- FIND THE GLOBAL NAME ENVIRONMENT\r
- getGlobalNames this_mod `thenRn` \ maybe_stuff ->\r
-\r
- -- CHECK FOR EARLY EXIT\r
- if not (maybeToBool maybe_stuff) then\r
- -- Everything is up to date; no need to recompile further\r
- rnStats [] `thenRn_`\r
- returnRn Nothing\r
- else\r
- let\r
- Just (export_env, gbl_env, fixity_env, global_avail_env) = maybe_stuff\r
- in\r
-\r
- -- RENAME THE SOURCE\r
- initRnMS gbl_env fixity_env SourceMode (\r
- rnSourceDecls local_decls\r
- ) `thenRn` \ (rn_local_decls, source_fvs) ->\r
-\r
- -- SLURP IN ALL THE NEEDED DECLARATIONS\r
- let\r
- real_source_fvs = implicitFVs mod_name `plusFV` source_fvs\r
- -- It's important to do the "plus" this way round, so that\r
- -- when compiling the prelude, locally-defined (), Bool, etc\r
- -- override the implicit ones. \r
- in\r
- slurpImpDecls real_source_fvs `thenRn` \ rn_imp_decls ->\r
-\r
- -- EXIT IF ERRORS FOUND\r
- checkErrsRn `thenRn` \ no_errs_so_far ->\r
- if not no_errs_so_far then\r
- -- Found errors already, so exit now\r
- rnStats [] `thenRn_`\r
- returnRn Nothing\r
- else\r
-\r
- -- GENERATE THE VERSION/USAGE INFO\r
- getImportVersions mod_name exports `thenRn` \ my_usages ->\r
- getNameSupplyRn `thenRn` \ name_supply ->\r
-\r
- -- REPORT UNUSED NAMES\r
- reportUnusedNames gbl_env global_avail_env\r
- export_env\r
- source_fvs `thenRn_`\r
-\r
- -- RETURN THE RENAMED MODULE\r
- let\r
- has_orphans = any isOrphanDecl rn_local_decls\r
- direct_import_mods = [mod | ImportDecl mod _ _ _ _ _ <- imports]\r
- rn_all_decls = rn_imp_decls ++ rn_local_decls \r
- renamed_module = HsModule mod_name vers \r
- trashed_exports trashed_imports\r
- rn_all_decls\r
- loc\r
- in\r
- rnStats rn_imp_decls `thenRn_`\r
- returnRn (Just (mkThisModule mod_name,\r
- renamed_module, \r
- (has_orphans, my_usages, export_env),\r
- name_supply,\r
- direct_import_mods))\r
- where\r
- trashed_exports = {-trace "rnSource:trashed_exports"-} Nothing\r
- trashed_imports = {-trace "rnSource:trashed_imports"-} []\r
-\end{code}\r
-\r
-@implicitFVs@ forces the renamer to slurp in some things which aren't\r
-mentioned explicitly, but which might be needed by the type checker.\r
-\r
-\begin{code}\r
-implicitFVs mod_name\r
- = implicit_main `plusFV` \r
- mkNameSet default_tys `plusFV`\r
- mkNameSet thinAirIdNames\r
- where\r
- -- Add occurrences for Int, Double, and (), because they\r
- -- are the types to which ambigious type variables may be defaulted by\r
- -- the type checker; so they won't always appear explicitly.\r
- -- [The () one is a GHC extension for defaulting CCall results.]\r
- -- ALSO: funTyCon, since it occurs implicitly everywhere!\r
- -- (we don't want to be bothered with making funTyCon a\r
- -- free var at every function application!)\r
- default_tys = [getName intTyCon, getName doubleTyCon,\r
- getName unitTyCon, getName funTyCon, getName boolTyCon]\r
-\r
- -- Add occurrences for IO or PrimIO\r
- implicit_main | mod_name == mAIN_Name\r
- || mod_name == pREL_MAIN_Name = unitFV ioTyCon_NAME\r
- | otherwise = emptyFVs\r
-\end{code}\r
-\r
-\begin{code}\r
-isOrphanDecl (InstD (InstDecl inst_ty _ _ _ _))\r
- = not (foldNameSet ((||) . isLocallyDefined) False (extractHsTyNames inst_ty))\r
-isOrphanDecl (RuleD (RuleDecl _ _ _ lhs _ _))\r
- = check lhs\r
- where\r
- check (HsVar v) = not (isLocallyDefined v)\r
- check (HsApp f a) = check f && check a\r
- check other = True\r
-isOrphanDecl other = False\r
-\end{code}\r
-\r
-\r
-%*********************************************************\r
-%* *\r
-\subsection{Slurping declarations}\r
-%* *\r
-%*********************************************************\r
-\r
-\begin{code}\r
--------------------------------------------------------\r
-slurpImpDecls source_fvs\r
- = traceRn (text "slurpImp" <+> fsep (map ppr (nameSetToList source_fvs))) `thenRn_`\r
-\r
- -- The current slurped-set records all local things\r
- getSlurped `thenRn` \ source_binders ->\r
- slurpSourceRefs source_binders source_fvs `thenRn` \ (decls1, needed1, inst_gates) ->\r
-\r
- -- Now we can get the instance decls\r
- slurpInstDecls decls1 needed1 inst_gates `thenRn` \ (decls2, needed2) ->\r
-\r
- -- And finally get everything else\r
- closeDecls decls2 needed2\r
-\r
--------------------------------------------------------\r
-slurpSourceRefs :: NameSet -- Variables defined in source\r
- -> FreeVars -- Variables referenced in source\r
- -> RnMG ([RenamedHsDecl],\r
- FreeVars, -- Un-satisfied needs\r
- FreeVars) -- "Gates"\r
--- The declaration (and hence home module) of each gate has\r
--- already been loaded\r
-\r
-slurpSourceRefs source_binders source_fvs\r
- = go [] -- Accumulating decls\r
- emptyFVs -- Unsatisfied needs\r
- source_fvs -- Accumulating gates\r
- (nameSetToList source_fvs) -- Gates whose defn hasn't been loaded yet\r
- where\r
- go decls fvs gates []\r
- = returnRn (decls, fvs, gates)\r
-\r
- go decls fvs gates (wanted_name:refs) \r
- | isWiredInName wanted_name\r
- = load_home wanted_name `thenRn_`\r
- go decls fvs (gates `plusFV` getWiredInGates wanted_name) refs\r
-\r
- | otherwise\r
- = importDecl wanted_name `thenRn` \ maybe_decl ->\r
- case maybe_decl of\r
- -- No declaration... (already slurped, or local)\r
- Nothing -> go decls fvs gates refs\r
- Just decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) ->\r
- let\r
- new_gates = getGates source_fvs new_decl\r
- in\r
- go (new_decl : decls)\r
- (fvs1 `plusFV` fvs)\r
- (gates `plusFV` new_gates)\r
- (nameSetToList new_gates ++ refs)\r
-\r
- -- When we find a wired-in name we must load its\r
- -- home module so that we find any instance decls therein\r
- load_home name \r
- | name `elemNameSet` source_binders = returnRn ()\r
- -- When compiling the prelude, a wired-in thing may\r
- -- be defined in this module, in which case we don't\r
- -- want to load its home module!\r
- -- Using 'isLocallyDefined' doesn't work because some of\r
- -- the free variables returned are simply 'listTyCon_Name',\r
- -- with a system provenance. We could look them up every time\r
- -- but that seems a waste.\r
- | otherwise = loadHomeInterface doc name `thenRn_`\r
- returnRn ()\r
- where\r
- doc = ptext SLIT("need home module for wired in thing") <+> ppr name\r
-\r
--------------------------------------------------------\r
--- slurpInstDecls imports appropriate instance decls.\r
--- It has to incorporate a loop, because consider\r
--- instance Foo a => Baz (Maybe a) where ...\r
--- It may be that Baz and Maybe are used in the source module,\r
--- but not Foo; so we need to chase Foo too.\r
-\r
-slurpInstDecls decls needed gates\r
- | isEmptyFVs gates\r
- = returnRn (decls, needed)\r
-\r
- | otherwise\r
- = getImportedInstDecls gates `thenRn` \ inst_decls ->\r
- rnInstDecls decls needed emptyFVs inst_decls `thenRn` \ (decls1, needed1, gates1) ->\r
- slurpInstDecls decls1 needed1 gates1\r
- where\r
- rnInstDecls decls fvs gates []\r
- = returnRn (decls, fvs, gates)\r
- rnInstDecls decls fvs gates (d:ds) \r
- = rnIfaceDecl d `thenRn` \ (new_decl, fvs1) ->\r
- rnInstDecls (new_decl:decls) \r
- (fvs1 `plusFV` fvs)\r
- (gates `plusFV` getInstDeclGates new_decl)\r
- ds\r
- \r
-\r
--------------------------------------------------------\r
--- closeDecls keeps going until the free-var set is empty\r
-closeDecls decls needed\r
- | not (isEmptyFVs needed)\r
- = slurpDecls decls needed `thenRn` \ (decls1, needed1) ->\r
- closeDecls decls1 needed1\r
-\r
- | otherwise\r
- = getImportedRules `thenRn` \ rule_decls ->\r
- case rule_decls of\r
- [] -> returnRn decls -- No new rules, so we are done\r
- other -> rnIfaceDecls decls emptyFVs rule_decls `thenRn` \ (decls1, needed1) ->\r
- closeDecls decls1 needed1\r
- \r
-\r
--------------------------------------------------------\r
-rnIfaceDecls :: [RenamedHsDecl] -> FreeVars\r
- -> [(Module, RdrNameHsDecl)]\r
- -> RnM d ([RenamedHsDecl], FreeVars)\r
-rnIfaceDecls decls fvs [] = returnRn (decls, fvs)\r
-rnIfaceDecls decls fvs (d:ds) = rnIfaceDecl d `thenRn` \ (new_decl, fvs1) ->\r
- rnIfaceDecls (new_decl:decls) (fvs1 `plusFV` fvs) ds\r
-\r
-rnIfaceDecl (mod, decl) = initIfaceRnMS mod (rnDecl decl) \r
- \r
-\r
--------------------------------------------------------\r
--- Augment decls with any decls needed by needed.\r
--- Return also free vars of the new decls (only)\r
-slurpDecls decls needed\r
- = go decls emptyFVs (nameSetToList needed) \r
- where\r
- go decls fvs [] = returnRn (decls, fvs)\r
- go decls fvs (ref:refs) = slurpDecl decls fvs ref `thenRn` \ (decls1, fvs1) ->\r
- go decls1 fvs1 refs\r
-\r
--------------------------------------------------------\r
-slurpDecl decls fvs wanted_name\r
- = importDecl wanted_name `thenRn` \ maybe_decl ->\r
- case maybe_decl of\r
- -- No declaration... (wired in thing)\r
- Nothing -> returnRn (decls, fvs)\r
-\r
- -- Found a declaration... rename it\r
- Just decl -> rnIfaceDecl decl `thenRn` \ (new_decl, fvs1) ->\r
- returnRn (new_decl:decls, fvs1 `plusFV` fvs)\r
-\end{code}\r
-\r
-\r
-%*********************************************************\r
-%* *\r
-\subsection{Extracting the 'gates'}\r
-%* *\r
-%*********************************************************\r
-\r
-When we import a declaration like\r
-\r
- data T = T1 Wibble | T2 Wobble\r
-\r
-we don't want to treat Wibble and Wobble as gates *unless* T1, T2\r
-respectively are mentioned by the user program. If only T is mentioned\r
-we want only T to be a gate; that way we don't suck in useless instance\r
-decls for (say) Eq Wibble, when they can't possibly be useful.\r
-\r
-@getGates@ takes a newly imported (and renamed) decl, and the free\r
-vars of the source program, and extracts from the decl the gate names.\r
-\r
-\begin{code}\r
-getGates source_fvs (SigD (IfaceSig _ ty _ _))\r
- = extractHsTyNames ty\r
-\r
-getGates source_fvs (TyClD (ClassDecl ctxt cls tvs sigs _ _ _ _ _ _))\r
- = delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) sigs)\r
- (map getTyVarName tvs)\r
- `addOneToNameSet` cls\r
- where\r
- get (ClassOpSig n _ ty _) \r
- | n `elemNameSet` source_fvs = extractHsTyNames ty\r
- | otherwise = emptyFVs\r
-\r
-getGates source_fvs (TyClD (TySynonym tycon tvs ty _))\r
- = delListFromNameSet (extractHsTyNames ty)\r
- (map getTyVarName tvs)\r
- -- A type synonym type constructor isn't a "gate" for instance decls\r
-\r
-getGates source_fvs (TyClD (TyData _ ctxt tycon tvs cons _ _ _))\r
- = delListFromNameSet (foldr (plusFV . get) (extractHsCtxtTyNames ctxt) cons)\r
- (map getTyVarName tvs)\r
- `addOneToNameSet` tycon\r
- where\r
- get (ConDecl n tvs ctxt details _)\r
- | n `elemNameSet` source_fvs\r
- -- If the constructor is method, get fvs from all its fields\r
- = delListFromNameSet (get_details details `plusFV` \r
- extractHsCtxtTyNames ctxt)\r
- (map getTyVarName tvs)\r
- get (ConDecl n tvs ctxt (RecCon fields) _)\r
- -- Even if the constructor isn't mentioned, the fields\r
- -- might be, as selectors. They can't mention existentially\r
- -- bound tyvars (typechecker checks for that) so no need for \r
- -- the deleteListFromNameSet part\r
- = foldr (plusFV . get_field) emptyFVs fields\r
- \r
- get other_con = emptyFVs\r
-\r
- get_details (VanillaCon tys) = plusFVs (map get_bang tys)\r
- get_details (InfixCon t1 t2) = get_bang t1 `plusFV` get_bang t2\r
- get_details (RecCon fields) = plusFVs [get_bang t | (_, t) <- fields]\r
- get_details (NewCon t _) = extractHsTyNames t\r
-\r
- get_field (fs,t) | any (`elemNameSet` source_fvs) fs = get_bang t\r
- | otherwise = emptyFVs\r
-\r
- get_bang (Banged t) = extractHsTyNames t\r
- get_bang (Unbanged t) = extractHsTyNames t\r
- get_bang (Unpacked t) = extractHsTyNames t\r
-\r
-getGates source_fvs other_decl = emptyFVs\r
-\end{code}\r
-\r
-getWiredInGates is just like getGates, but it sees a wired-in Name\r
-rather than a declaration.\r
-\r
-\begin{code}\r
-getWiredInGates :: Name -> FreeVars\r
-getWiredInGates name -- No classes are wired in\r
- | is_id = getWiredInGates_s (namesOfType (idType the_id))\r
- | isSynTyCon the_tycon = getWiredInGates_s (delListFromNameSet (namesOfType ty) (map getName tyvars))\r
- | otherwise = unitFV name\r
- where\r
- maybe_wired_in_id = maybeWiredInIdName name\r
- is_id = maybeToBool maybe_wired_in_id\r
- maybe_wired_in_tycon = maybeWiredInTyConName name\r
- Just the_id = maybe_wired_in_id\r
- Just the_tycon = maybe_wired_in_tycon\r
- (tyvars,ty) = getSynTyConDefn the_tycon\r
-\r
-getWiredInGates_s names = foldr (plusFV . getWiredInGates) emptyFVs (nameSetToList names)\r
-\end{code}\r
-\r
-\begin{code}\r
-getInstDeclGates (InstD (InstDecl inst_ty _ _ _ _)) = extractHsTyNames inst_ty\r
-getInstDeclGates other = emptyFVs\r
-\end{code}\r
-\r
-\r
-%*********************************************************\r
-%* *\r
-\subsection{Unused names}\r
-%* *\r
-%*********************************************************\r
-\r
-\begin{code}\r
-reportUnusedNames gbl_env avail_env (ExportEnv export_avails _) mentioned_names\r
- | not (opt_WarnUnusedBinds || opt_WarnUnusedImports)\r
- = returnRn ()\r
-\r
- | otherwise\r
- = let\r
- used_names = mentioned_names `unionNameSets` availsToNameSet export_avails\r
-\r
- -- Now, a use of C implies a use of T,\r
- -- if C was brought into scope by T(..) or T(C)\r
- really_used_names = used_names `unionNameSets`\r
- mkNameSet [ availName avail \r
- | sub_name <- nameSetToList used_names,\r
- let avail = case lookupNameEnv avail_env sub_name of\r
- Just avail -> avail\r
- Nothing -> pprTrace "r.u.n" (ppr sub_name) $\r
- Avail sub_name\r
- ]\r
-\r
- defined_names = mkNameSet (concat (rdrEnvElts gbl_env))\r
- defined_but_not_used = nameSetToList (defined_names `minusNameSet` really_used_names)\r
-\r
- -- Filter out the ones only defined implicitly\r
- bad_guys = filter reportableUnusedName defined_but_not_used\r
- in\r
- warnUnusedTopNames bad_guys `thenRn_`\r
- returnRn ()\r
-\r
-reportableUnusedName :: Name -> Bool\r
-reportableUnusedName name\r
- = explicitlyImported (getNameProvenance name) &&\r
- not (startsWithUnderscore (occNameUserString (nameOccName name)))\r
- where\r
- explicitlyImported (LocalDef _ _) = True -- Report unused defns of local vars\r
- explicitlyImported (NonLocalDef (UserImport _ _ expl) _) = expl -- Report unused explicit imports\r
- explicitlyImported other = False -- Don't report others\r
- \r
- -- Haskell 98 encourages compilers to suppress warnings about\r
- -- unused names in a pattern if they start with "_".\r
- startsWithUnderscore ('_' : _) = True -- Suppress warnings for names starting\r
- startsWithUnderscore other = False -- with an underscore\r
-\r
-rnStats :: [RenamedHsDecl] -> RnMG ()\r
-rnStats imp_decls\r
- | opt_D_dump_rn_trace || \r
- opt_D_dump_rn_stats ||\r
- opt_D_dump_rn \r
- = getRnStats imp_decls `thenRn` \ msg ->\r
- ioToRnM (printErrs msg) `thenRn_`\r
- returnRn ()\r
-\r
- | otherwise = returnRn ()\r
-\end{code}\r
-\r
-\r
-\r
-%*********************************************************\r
-%* *\r
-\subsection{Statistics}\r
-%* *\r
-%*********************************************************\r
-\r
-\begin{code}\r
-getRnStats :: [RenamedHsDecl] -> RnMG SDoc\r
-getRnStats imported_decls\r
- = getIfacesRn `thenRn` \ ifaces ->\r
- let\r
- n_mods = length [() | (_, _, Just _) <- eltsFM (iImpModInfo ifaces)]\r
-\r
- decls_read = [decl | (_, avail, True, (_,decl)) <- nameEnvElts (iDecls ifaces),\r
- -- Data, newtype, and class decls are in the decls_fm\r
- -- under multiple names; the tycon/class, and each\r
- -- constructor/class op too.\r
- -- The 'True' selects just the 'main' decl\r
- not (isLocallyDefined (availName avail))\r
- ]\r
-\r
- (cd_rd, dd_rd, nd_rd, sd_rd, vd_rd, _) = count_decls decls_read\r
- (cd_sp, dd_sp, nd_sp, sd_sp, vd_sp, id_sp) = count_decls imported_decls\r
-\r
- unslurped_insts = iInsts ifaces\r
- inst_decls_unslurped = length (bagToList unslurped_insts)\r
- inst_decls_read = id_sp + inst_decls_unslurped\r
-\r
- stats = vcat \r
- [int n_mods <+> text "interfaces read",\r
- hsep [ int cd_sp, text "class decls imported, out of", \r
- int cd_rd, text "read"],\r
- hsep [ int dd_sp, text "data decls imported, out of", \r
- int dd_rd, text "read"],\r
- hsep [ int nd_sp, text "newtype decls imported, out of", \r
- int nd_rd, text "read"],\r
- hsep [int sd_sp, text "type synonym decls imported, out of", \r
- int sd_rd, text "read"],\r
- hsep [int vd_sp, text "value signatures imported, out of", \r
- int vd_rd, text "read"],\r
- hsep [int id_sp, text "instance decls imported, out of", \r
- int inst_decls_read, text "read"],\r
- text "cls dcls slurp" <+> fsep (map (ppr . tyClDeclName) \r
- [d | TyClD d <- imported_decls, isClassDecl d]),\r
- text "cls dcls read" <+> fsep (map (ppr . tyClDeclName) \r
- [d | TyClD d <- decls_read, isClassDecl d])]\r
- in\r
- returnRn (hcat [text "Renamer stats: ", stats])\r
-\r
-count_decls decls\r
- = (class_decls, \r
- data_decls, \r
- newtype_decls,\r
- syn_decls, \r
- val_decls, \r
- inst_decls)\r
- where\r
- tycl_decls = [d | TyClD d <- decls]\r
- (class_decls, data_decls, newtype_decls, syn_decls) = countTyClDecls tycl_decls\r
-\r
- val_decls = length [() | SigD _ <- decls]\r
- inst_decls = length [() | InstD _ <- decls]\r
-\end{code} \r
-\r
+%
+% (c) The GRASP Project, Glasgow University, 1992-1998
+%
+\section[Rename]{Renaming and dependency analysis passes}
+
+\begin{code}
+module Rename ( renameModule ) where
+
+#include "HsVersions.h"
+
+import HsSyn
+import RdrHsSyn ( RdrNameHsModule )
+import RnHsSyn ( RenamedHsModule, RenamedHsDecl,
+ extractHsTyNames, extractHsCtxtTyNames
+ )
+
+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 ( rnSourceDecls, rnDecl )
+import RnIfaces ( getImportedInstDecls, importDecl, getImportVersions,
+ getImportedRules, loadHomeInterface, getSlurped, removeContext
+ )
+import RnEnv ( availName, availNames, availsToNameSet,
+ warnUnusedTopNames, mapFvRn, lookupImplicitOccRn,
+ FreeVars, plusFVs, plusFV, unitFV, emptyFVs, isEmptyFVs
+ )
+import Module ( Module, ModuleName, pprModule, mkSearchPath, mkThisModule )
+import Name ( Name, isLocallyDefined,
+ NamedThing(..), ImportReason(..), Provenance(..),
+ pprOccName, nameOccName,
+ getNameProvenance,
+ maybeWiredInTyConName, maybeWiredInIdName, isWiredInName
+ )
+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 Outputable
+\end{code}
+
+
+
+\begin{code}
+renameModule :: UniqSupply
+ -> RdrNameHsModule
+ -> 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, dump_action), rn_errs_bag, rn_warns_bag) ->
+
+ -- Check for warnings
+ printErrorsAndWarnings rn_errs_bag rn_warns_bag >>
+
+ -- Dump any debugging output
+ dump_action >>
+
+ -- Return results
+ 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 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
+ rnDump [] [] `thenRn` \ dump_action ->
+ returnRn (Nothing, dump_action)
+ else
+ let
+ Just (export_env, gbl_env, fixity_env, global_avail_env) = maybe_stuff
+ in
+
+ -- RENAME THE SOURCE
+ initRnMS gbl_env fixity_env SourceMode (
+ rnSourceDecls local_decls
+ ) `thenRn` \ (rn_local_decls, source_fvs) ->
+
+ -- SLURP IN ALL THE NEEDED DECLARATIONS
+ 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 ->
+ if not no_errs_so_far then
+ -- Found errors already, so exit now
+ 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` \ my_usages ->
+ getNameSupplyRn `thenRn` \ name_supply ->
+
+ -- REPORT UNUSED NAMES
+ reportUnusedNames gbl_env global_avail_env
+ export_env
+ source_fvs `thenRn_`
+
+ -- RETURN THE RENAMED MODULE
+ let
+ has_orphans = any isOrphanDecl rn_local_decls
+ direct_import_mods = [mod | ImportDecl mod _ _ _ _ _ <- imports]
+ renamed_module = HsModule mod_name vers
+ trashed_exports trashed_imports
+ rn_all_decls
+ loc
+ in
+ 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"-} []
+\end{code}
+
+@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}
+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 always appear explicitly.
+ -- [The () one is a GHC extension for defaulting CCall results.]
+ -- 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_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
+ check (HsVar v) = not (isLocallyDefined v)
+ check (HsApp f a) = check f && check a
+ check other = True
+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}
+-------------------------------------------------------
+-- 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}
+
+
+%*********************************************************
+%* *
+\subsection{Extracting the `gates'}
+%* *
+%*********************************************************
+
+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.
+
+@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
+ 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
+
+ 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}
+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}
+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
+ 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 imp_decls `thenRn` \ stats_msg ->
+
+ returnRn (printErrs stats_msg >>
+ dumpIfSet opt_D_dump_rn "Renamer:" (vcat (map ppr decls)))
+
+ | 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}
+
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