X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRename.lhs;h=1a75cb34e646b98623cda714306c1455a4224bb1;hb=dd6f34b632c29306e56b6bdf232316af26800a4f;hp=6f0c149abb2369c9495ecc9f4c5e77cb3e27ae93;hpb=6cce4a58fb206f16db579fded00fd0a7090543ae;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/Rename.lhs b/ghc/compiler/rename/Rename.lhs index 6f0c149..1a75cb3 100644 --- a/ghc/compiler/rename/Rename.lhs +++ b/ghc/compiler/rename/Rename.lhs @@ -4,518 +4,613 @@ \section[Rename]{Renaming and dependency analysis passes} \begin{code} -module Rename ( renameModule ) where +module Rename ( + renameModule, renameStmt, renameRdrName, + closeIfaceDecls, checkOldIface + ) where #include "HsVersions.h" import HsSyn -import RdrHsSyn ( RdrNameHsModule ) -import RnHsSyn ( RenamedHsModule, RenamedHsDecl, - extractHsTyNames, extractHsCtxtTyNames +import RdrHsSyn ( RdrNameHsModule, RdrNameHsDecl, RdrNameDeprecation, + RdrNameTyClDecl, RdrNameRuleDecl, RdrNameInstDecl, RdrNameImportDecl, + RdrNameStmt + ) +import RnHsSyn ( RenamedHsDecl, RenamedTyClDecl, RenamedRuleDecl, RenamedInstDecl, + RenamedStmt, + instDeclFVs, tyClDeclFVs, ruleDeclFVs ) -import CmdLineOpts ( opt_HiMap, opt_D_dump_rn_trace, - opt_D_dump_rn, opt_D_dump_rn_stats, - opt_WarnUnusedBinds, opt_WarnUnusedImports - ) +import CmdLineOpts ( DynFlags, DynFlag(..) ) import RnMonad -import RnNames ( getGlobalNames ) -import RnSource ( rnSourceDecls, rnDecl ) -import RnIfaces ( getImportedInstDecls, importDecl, getImportVersions, - getImportedRules, loadHomeInterface, getSlurped, removeContext +import RnExpr ( rnStmt ) +import RnNames ( getGlobalNames, exportsFromAvail ) +import RnSource ( rnSourceDecls, rnTyClDecl, rnIfaceRuleDecl, rnInstDecl ) +import RnIfaces ( slurpImpDecls, mkImportInfo, recordLocalSlurps, + closeDecls, + RecompileRequired, outOfDate, recompileRequired + ) +import RnHiFiles ( readIface, loadInterface, + loadExports, loadFixDecls, loadDeprecs, ) -import RnEnv ( availName, availNames, availsToNameSet, - warnUnusedImports, warnUnusedLocalBinds, mapFvRn, lookupImplicitOccRn, - FreeVars, plusFVs, plusFV, unitFV, emptyFVs, isEmptyFVs +import RnEnv ( availsToNameSet, mkIfaceGlobalRdrEnv, + emptyAvailEnv, unitAvailEnv, availEnvElts, + plusAvailEnv, groupAvails, warnUnusedImports, + warnUnusedLocalBinds, warnUnusedModules, + lookupSrcName, getImplicitStmtFVs, + getImplicitModuleFVs, newGlobalName, unQualInScope, + ubiquitousNames, lookupOccRn ) -import Module ( Module, ModuleName, pprModule, mkSearchPath, mkThisModule ) -import Name ( Name, isLocallyDefined, - NamedThing(..), ImportReason(..), Provenance(..), - pprOccName, nameOccName, nameUnique, - getNameProvenance, isUserImportedExplicitlyName, - maybeWiredInTyConName, maybeWiredInIdName, isWiredInName +import Module ( Module, ModuleName, WhereFrom(..), + moduleNameUserString, moduleName, + moduleEnvElts ) -import Id ( idType ) -import DataCon ( dataConTyCon, dataConType ) -import TyCon ( TyCon, tyConDataCons, isSynTyCon, getSynTyConDefn ) -import RdrName ( RdrName ) +import Name ( Name, nameModule ) +import NameEnv import NameSet -import PrelMods ( mAIN_Name, pREL_MAIN_Name ) -import TysWiredIn ( unitTyCon, intTyCon, doubleTyCon, boolTyCon ) -import PrelInfo ( ioTyCon_NAME, thinAirIdNames, fractionalClassKeys, 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 SrcLoc ( mkBuiltinSrcLoc ) +import RdrName ( foldRdrEnv, isQual ) +import PrelNames ( pRELUDE_Name ) +import ErrUtils ( dumpIfSet, dumpIfSet_dyn, showPass, + printErrorsAndWarnings, errorsFound ) +import Bag ( bagToList ) +import FiniteMap ( FiniteMap, fmToList, emptyFM, lookupFM, + addToFM_C, elemFM, addToFM + ) +import Maybes ( maybeToBool, catMaybes ) import Outputable +import IO ( openFile, IOMode(..) ) +import HscTypes ( PersistentCompilerState, HomeIfaceTable, HomeSymbolTable, + ModIface(..), WhatsImported(..), + VersionInfo(..), ImportVersion, IsExported, + IfaceDecls, mkIfaceDecls, dcl_tycl, dcl_rules, dcl_insts, + GlobalRdrEnv, GlobalRdrElt(..), pprGlobalRdrEnv, + AvailEnv, GenAvailInfo(..), AvailInfo, + Provenance(..), ImportReason(..), initialVersionInfo, + Deprecations(..), GhciMode(..), + LocalRdrEnv + ) +import List ( partition, nub ) \end{code} + +%********************************************************* +%* * +\subsection{The main wrappers} +%* * +%********************************************************* + \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 +renameModule :: DynFlags + -> HomeIfaceTable -> HomeSymbolTable + -> PersistentCompilerState + -> Module -> RdrNameHsModule + -> IO (PersistentCompilerState, PrintUnqualified, + Maybe (IsExported, ModIface, [RenamedHsDecl])) + -- Nothing => some error occurred in the renamer + +renameModule dflags hit hst pcs this_module rdr_module + = renameSource dflags hit hst pcs this_module $ + rename this_module rdr_module \end{code} - \begin{code} -rename this_mod@(HsModule mod_name vers _ imports local_decls mod_deprec 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) +renameStmt :: DynFlags + -> HomeIfaceTable -> HomeSymbolTable + -> PersistentCompilerState + -> Module -- current context (scope to compile in) + -> Module -- current module + -> LocalRdrEnv -- current context (temp bindings) + -> RdrNameStmt -- parsed stmt + -> IO ( PersistentCompilerState, + PrintUnqualified, + Maybe ([Name], (RenamedStmt, [RenamedHsDecl])) + ) + +renameStmt dflags hit hst pcs scope_module this_module local_env stmt + = renameSource dflags hit hst pcs this_module $ + + -- load the context module + loadContextModule scope_module $ \ (rdr_env, print_unqual) -> + + -- Rename the stmt + initRnMS rdr_env local_env emptyLocalFixityEnv CmdLineMode ( + rnStmt stmt $ \ stmt' -> + returnRn (([], stmt'), emptyFVs) + ) `thenRn` \ ((binders, stmt), fvs) -> + + -- Bale out if we fail + checkErrsRn `thenRn` \ no_errs_so_far -> + if not no_errs_so_far then + doDump dflags [] stmt [] `thenRn_` returnRn (print_unqual, Nothing) else + + slurpImplicitDecls fvs local_env `thenRn` \ decls -> + + doDump dflags binders stmt decls `thenRn_` + returnRn (print_unqual, Just (binders, (stmt, decls))) + + where + doDump :: DynFlags -> [Name] -> RenamedStmt -> [RenamedHsDecl] + -> RnMG (Either IOError ()) + doDump dflags bndrs stmt decls + = ioToRnM (dumpIfSet_dyn dflags Opt_D_dump_rn "Renamer:" + (vcat [text "Binders:" <+> ppr bndrs, + ppr stmt, text "", + vcat (map ppr decls)])) + + +renameRdrName + :: DynFlags + -> HomeIfaceTable -> HomeSymbolTable + -> PersistentCompilerState + -> Module -- current context (scope to compile in) + -> Module -- current module + -> LocalRdrEnv -- current context (temp bindings) + -> [RdrName] -- name to rename + -> IO ( PersistentCompilerState, + PrintUnqualified, + Maybe ([Name], [RenamedHsDecl]) + ) + +renameRdrName dflags hit hst pcs scope_module this_module local_env rdr_names = + renameSource dflags hit hst pcs this_module $ + loadContextModule scope_module $ \ (rdr_env, print_unqual) -> + + -- rename the rdr_name + initRnMS rdr_env local_env emptyLocalFixityEnv CmdLineMode + (mapRn (tryRn.lookupOccRn) rdr_names) `thenRn` \ maybe_names -> + let + ok_names = [ a | Right a <- maybe_names ] + in + if null ok_names + then let errs = head [ e | Left e <- maybe_names ] + in setErrsRn errs `thenRn_` + doDump dflags ok_names [] `thenRn_` + returnRn (print_unqual, Nothing) + else + + slurpImplicitDecls (mkNameSet ok_names) local_env `thenRn` \ decls -> + doDump dflags ok_names decls `thenRn_` + returnRn (print_unqual, Just (ok_names, decls)) + where + doDump :: DynFlags -> [Name] -> [RenamedHsDecl] -> RnMG (Either IOError ()) + doDump dflags names decls + = ioToRnM (dumpIfSet_dyn dflags Opt_D_dump_rn "Renamer:" + (vcat [ppr names, text "", + vcat (map ppr decls)])) + + +-- Load the interface for the context module, so +-- that we can get its top-level lexical environment +-- Bale out if we fail to do this +loadContextModule scope_module thing_inside + = let doc = text "context for compiling expression" + in + loadInterface doc (moduleName scope_module) ImportByUser `thenRn` \ iface -> + let rdr_env = mi_globals iface + print_unqual = unQualInScope rdr_env + in + checkErrsRn `thenRn` \ no_errs_so_far -> + if not no_errs_so_far then + returnRn (print_unqual, Nothing) + else + thing_inside (rdr_env, print_unqual) + +-- Add implicit free vars, and close decls +slurpImplicitDecls fvs local_env + = getImplicitStmtFVs `thenRn` \ implicit_fvs -> let - Just (export_env, gbl_env, fixity_env, global_avail_env) = maybe_stuff + filtered_fvs = fvs `delListFromNameSet` rdrEnvElts local_env + source_fvs = implicit_fvs `plusFV` filtered_fvs in + slurpImpDecls source_fvs +\end{code} - -- RENAME THE SOURCE - initRnMS gbl_env fixity_env SourceMode ( - rnSourceDecls local_decls - ) `thenRn` \ (rn_local_decls, source_fvs) -> +%********************************************************* +%* * +\subsection{The main function: rename} +%* * +%********************************************************* - -- SLURP IN ALL THE NEEDED DECLARATIONS - implicitFVs mod_name rn_local_decls `thenRn` \ implicit_fvs -> +\begin{code} +renameSource :: DynFlags + -> HomeIfaceTable -> HomeSymbolTable + -> PersistentCompilerState + -> Module + -> RnMG (PrintUnqualified, Maybe r) + -> IO (PersistentCompilerState, PrintUnqualified, Maybe r) + -- Nothing => some error occurred in the renamer + +renameSource dflags hit hst old_pcs this_module thing_inside + = do { showPass dflags "Renamer" + + -- Initialise the renamer monad + ; (new_pcs, msgs, (print_unqual, maybe_rn_stuff)) + <- initRn dflags hit hst old_pcs this_module thing_inside + + -- Print errors from renaming + ; printErrorsAndWarnings print_unqual msgs ; + + -- Return results. No harm in updating the PCS + ; if errorsFound msgs then + return (new_pcs, print_unqual, Nothing) + else + return (new_pcs, print_unqual, maybe_rn_stuff) + } +\end{code} + +\begin{code} +rename :: Module -> RdrNameHsModule + -> RnMG (PrintUnqualified, Maybe (IsExported, ModIface, [RenamedHsDecl])) +rename this_module contents@(HsModule _ _ exports imports local_decls mod_deprec loc) + = pushSrcLocRn loc $ + + -- FIND THE GLOBAL NAME ENVIRONMENT + getGlobalNames this_module contents `thenRn` \ (gbl_env, local_gbl_env, all_avails@(_, global_avail_env)) -> 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. + print_unqualified = unQualInScope gbl_env in - slurpImpDecls real_source_fvs `thenRn` \ rn_imp_decls -> - let - rn_all_decls = rn_local_decls ++ rn_imp_decls + -- Exit if we've found any errors + checkErrsRn `thenRn` \ no_errs_so_far -> + if not no_errs_so_far then + -- Found errors already, so exit now + rnDump [] [] `thenRn_` + returnRn (print_unqualified, Nothing) + else + + -- PROCESS EXPORT LIST + exportsFromAvail mod_name exports all_avails gbl_env `thenRn` \ export_avails -> + + traceRn (text "Local top-level environment" $$ + nest 4 (pprGlobalRdrEnv local_gbl_env)) `thenRn_` - -- COLLECT ALL DEPRECATIONS - deprec_sigs = [ ds | ValD bnds <- rn_local_decls, ds <- collectDeprecs bnds ] + -- DEAL WITH DEPRECATIONS + rnDeprecs local_gbl_env mod_deprec + [d | DeprecD d <- local_decls] `thenRn` \ my_deprecs -> - (rn_mod_deprec, deprecs) = case mod_deprec of - Nothing -> (Nothing, deprec_sigs) - Just (DeprecMod t) -> let dm = DeprecMod t in (Just dm, dm:deprec_sigs) + -- DEAL WITH LOCAL FIXITIES + fixitiesFromLocalDecls local_gbl_env local_decls `thenRn` \ local_fixity_env -> - collectDeprecs EmptyBinds = [] - collectDeprecs (ThenBinds x y) = collectDeprecs x ++ collectDeprecs y - collectDeprecs (MonoBind _ sigs _) = [ d | DeprecSig d _ <- sigs ] - in + -- RENAME THE SOURCE + rnSourceDecls gbl_env local_fixity_env local_decls `thenRn` \ (rn_local_decls, source_fvs) -> -- EXIT IF ERRORS FOUND + -- We exit here if there are any errors in the source, *before* + -- we attempt to slurp the decls from the interfaces, otherwise + -- the slurped decls may get lost when we return up the stack + -- to hscMain/hscExpr. 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) + rnDump [] rn_local_decls `thenRn_` + returnRn (print_unqualified, Nothing) else - -- GENERATE THE VERSION/USAGE INFO - getImportVersions mod_name export_env `thenRn` \ my_usages -> - getNameSupplyRn `thenRn` \ name_supply -> + -- SLURP IN ALL THE NEEDED DECLARATIONS + -- Find out what re-bindable names to use for desugaring + getImplicitModuleFVs mod_name rn_local_decls `thenRn` \ implicit_fvs -> + let + export_fvs = availsToNameSet export_avails + source_fvs2 = source_fvs `plusFV` export_fvs + -- The export_fvs make the exported names look just as if they + -- occurred in the source program. For the reasoning, see the + -- comments with RnIfaces.mkImportInfo + -- It also helps reportUnusedNames, which of course must not complain + -- that 'f' isn't mentioned if it is mentioned in the export list + + source_fvs3 = implicit_fvs `plusFV` source_fvs2 + -- 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 + traceRn (text "Source FVs:" <+> fsep (map ppr (nameSetToList source_fvs3))) `thenRn_` + slurpImpDecls source_fvs3 `thenRn` \ rn_imp_decls -> + rnDump rn_imp_decls rn_local_decls `thenRn_` - -- REPORT UNUSED NAMES - reportUnusedNames gbl_env global_avail_env - export_env - source_fvs `thenRn_` + -- GENERATE THE VERSION/USAGE INFO + mkImportInfo mod_name imports `thenRn` \ my_usages -> - -- RETURN THE RENAMED MODULE + -- BUILD THE MODULE INTERFACE 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 - rn_mod_deprec - loc + -- We record fixities even for things that aren't exported, + -- so that we can change into the context of this moodule easily + fixities = mkNameEnv [ (name, fixity) + | FixitySig name fixity loc <- nameEnvElts local_fixity_env + ] + + -- Sort the exports to make them easier to compare for versions + my_exports = groupAvails this_module export_avails + + final_decls = rn_local_decls ++ rn_imp_decls + + mod_iface = ModIface { mi_module = this_module, + mi_version = initialVersionInfo, + mi_usages = my_usages, + mi_boot = False, + mi_orphan = panic "is_orphan", + mi_exports = my_exports, + mi_globals = gbl_env, + mi_fixities = fixities, + mi_deprecs = my_deprecs, + mi_decls = panic "mi_decls" + } + + is_exported name = name `elemNameSet` exported_names + exported_names = availsToNameSet export_avails in - rnDump rn_imp_decls rn_all_decls `thenRn` \ dump_action -> - returnRn (Just (mkThisModule mod_name, - renamed_module, - (InterfaceDetails has_orphans my_usages export_env deprecs), - 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. + -- REPORT UNUSED NAMES, AND DEBUG DUMP + reportUnusedNames mod_iface print_unqualified + imports global_avail_env + source_fvs2 rn_imp_decls `thenRn_` + -- NB: source_fvs2: include exports (else we get bogus + -- warnings of unused things) but not implicit FVs. -\begin{code} -implicitFVs mod_name decls - = mapRn lookupImplicitOccRn implicit_occs `thenRn` \ implicit_names -> - returnRn (implicit_main `plusFV` - mkNameSet (map getName default_tycons) `plusFV` - mkNameSet thinAirIdNames `plusFV` - mkNameSet implicit_names) + returnRn (print_unqualified, Just (is_exported, mod_iface, final_decls)) where - -- Add occurrences for Int, 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!) - -- Double is dealt with separately in getGates - default_tycons = [unitTyCon, funTyCon, boolTyCon, intTyCon] - - -- 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 (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 + mod_name = moduleName this_module \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{Fixities} +%* * +%********************************************************* + \begin{code} -dupDefaultDeclErrRn (DefaultDecl _ locn1 : dup_things) - = pushSrcLocRn locn1 $ - addErrRn msg +fixitiesFromLocalDecls :: GlobalRdrEnv -> [RdrNameHsDecl] -> RnMG LocalFixityEnv +fixitiesFromLocalDecls gbl_env decls + = foldlRn getFixities emptyNameEnv decls `thenRn` \ env -> + traceRn (text "fixity env" <+> vcat (map ppr (nameEnvElts env))) `thenRn_` + returnRn env where - msg = hang (ptext SLIT("Multiple default declarations")) - 4 (vcat (map pp dup_things)) - pp (DefaultDecl _ locn) = ptext SLIT("here was another default declaration") <+> ppr locn + getFixities :: LocalFixityEnv -> RdrNameHsDecl -> RnMG LocalFixityEnv + getFixities acc (FixD fix) + = fix_decl acc fix + + getFixities acc (TyClD (ClassDecl { tcdSigs = 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 + pushSrcLocRn loc $ + lookupSrcName gbl_env rdr_name `thenRn` \ 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 (extendNameEnv acc name (FixitySig name fixity loc)) \end{code} %********************************************************* %* * -\subsection{Slurping declarations} +\subsection{Deprecations} %* * %********************************************************* +For deprecations, all we do is check that the names are in scope. +It's only imported deprecations, dealt with in RnIfaces, that we +gather them together. + \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 if we 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 +rnDeprecs :: GlobalRdrEnv -> Maybe DeprecTxt + -> [RdrNameDeprecation] -> RnMG Deprecations +rnDeprecs gbl_env Nothing [] + = returnRn NoDeprecs + +rnDeprecs gbl_env (Just txt) decls + = mapRn (addErrRn . badDeprec) decls `thenRn_` + returnRn (DeprecAll txt) + +rnDeprecs gbl_env Nothing decls + = mapRn rn_deprec decls `thenRn` \ pairs -> + returnRn (DeprecSome (mkNameEnv (catMaybes pairs))) + where + rn_deprec (Deprecation rdr_name txt loc) + = pushSrcLocRn loc $ + lookupSrcName gbl_env rdr_name `thenRn` \ name -> + returnRn (Just (name, (name,txt))) +\end{code} - | 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 + +%************************************************************************ +%* * +\subsection{Grabbing the old interface file and checking versions} +%* * +%************************************************************************ + +\begin{code} +checkOldIface :: GhciMode + -> DynFlags + -> HomeIfaceTable -> HomeSymbolTable + -> PersistentCompilerState + -> FilePath + -> Bool -- Source unchanged + -> Maybe ModIface -- Old interface from compilation manager, if any + -> IO (PersistentCompilerState, Bool, (RecompileRequired, Maybe ModIface)) + -- True <=> errors happened + +checkOldIface ghci_mode dflags hit hst pcs iface_path source_unchanged maybe_iface + = runRn dflags hit hst pcs (panic "Bogus module") $ + + -- CHECK WHETHER THE SOURCE HAS CHANGED + ( if not source_unchanged then + traceHiDiffsRn (nest 4 (text "Source file changed or recompilation check turned off")) + else returnRn () ) `thenRn_` + + -- If the source has changed and we're in interactive mode, avoid reading + -- an interface; just return the one we might have been supplied with. + if ghci_mode == Interactive && not source_unchanged then + returnRn (outOfDate, maybe_iface) + else + + case maybe_iface of + Just old_iface -> -- Use the one we already have + setModuleRn (mi_module old_iface) (check_versions old_iface) + + Nothing -- try and read it from a file + -> readIface iface_path `thenRn` \ read_result -> + case read_result of + Left err -> -- Old interface file not found, or garbled; give up + traceHiDiffsRn ( + text "Cannot read old interface file:" + $$ nest 4 err) `thenRn_` + returnRn (outOfDate, Nothing) + + Right parsed_iface + -> setModuleRn (pi_mod parsed_iface) $ + loadOldIface parsed_iface `thenRn` \ m_iface -> + check_versions m_iface + where + check_versions :: ModIface -> RnMG (RecompileRequired, Maybe ModIface) + check_versions iface + | not source_unchanged + = returnRn (outOfDate, Just iface) + | otherwise + = -- Check versions + recompileRequired iface_path iface `thenRn` \ recompile -> + returnRn (recompile, Just iface) \end{code} +I think the following function should now have a more representative name, +but what? + +\begin{code} +loadOldIface :: ParsedIface -> RnMG ModIface + +loadOldIface parsed_iface + = let iface = parsed_iface + mod = pi_mod iface + in + initIfaceRnMS mod ( + loadHomeDecls (pi_decls iface) `thenRn` \ decls -> + loadHomeRules (pi_rules iface) `thenRn` \ rules -> + loadHomeInsts (pi_insts iface) `thenRn` \ insts -> + returnRn (decls, rules, insts) + ) + `thenRn` \ ((decls_vers, new_decls), (rule_vers, new_rules), new_insts) -> + + mapRn loadHomeUsage (pi_usages iface) `thenRn` \ usages -> + loadExports (pi_exports iface) `thenRn` \ (export_vers, avails) -> + loadFixDecls mod (pi_fixity iface) `thenRn` \ fix_env -> + loadDeprecs mod (pi_deprecs iface) `thenRn` \ deprec_env -> + let + version = VersionInfo { vers_module = pi_vers iface, + vers_exports = export_vers, + vers_rules = rule_vers, + vers_decls = decls_vers } + + decls = mkIfaceDecls new_decls new_rules new_insts + + mod_iface = ModIface { mi_module = mod, mi_version = version, + mi_exports = avails, mi_usages = usages, + mi_boot = False, mi_orphan = pi_orphan iface, + mi_fixities = fix_env, mi_deprecs = deprec_env, + mi_decls = decls, + mi_globals = mkIfaceGlobalRdrEnv avails + } + in + returnRn mod_iface +\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) +loadHomeDecls :: [(Version, RdrNameTyClDecl)] + -> RnMS (NameEnv Version, [RenamedTyClDecl]) +loadHomeDecls decls = foldlRn loadHomeDecl (emptyNameEnv, []) decls + +loadHomeDecl :: (NameEnv Version, [RenamedTyClDecl]) + -> (Version, RdrNameTyClDecl) + -> RnMS (NameEnv Version, [RenamedTyClDecl]) +loadHomeDecl (version_map, decls) (version, decl) + = rnTyClDecl decl `thenRn` \ decl' -> + returnRn (extendNameEnv version_map (tyClDeclName decl') version, decl':decls) + +------------------ +loadHomeRules :: (Version, [RdrNameRuleDecl]) + -> RnMS (Version, [RenamedRuleDecl]) +loadHomeRules (version, rules) + = mapRn rnIfaceRuleDecl rules `thenRn` \ rules' -> + returnRn (version, rules') + +------------------ +loadHomeInsts :: [RdrNameInstDecl] + -> RnMS [RenamedInstDecl] +loadHomeInsts insts = mapRn rnInstDecl insts + +------------------ +loadHomeUsage :: ImportVersion OccName + -> RnMG (ImportVersion Name) +loadHomeUsage (mod_name, orphans, is_boot, whats_imported) + = rn_imps whats_imported `thenRn` \ whats_imported' -> + returnRn (mod_name, orphans, is_boot, whats_imported') 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) + rn_imps NothingAtAll = returnRn NothingAtAll + rn_imps (Everything v) = returnRn (Everything v) + rn_imps (Specifically mv ev items rv) = mapRn rn_imp items `thenRn` \ items' -> + returnRn (Specifically mv ev items' rv) + rn_imp (occ,vers) = newGlobalName mod_name occ `thenRn` \ name -> + returnRn (name,vers) \end{code} + %********************************************************* %* * -\subsection{Extracting the `gates'} +\subsection{Closing up the interface 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. - -@getGates@ takes a newly imported (and renamed) decl, and the free -vars of the source program, and extracts from the decl the gate names. +Suppose we discover we don't need to recompile. Then we start from the +IfaceDecls in the ModIface, and fluff them up by sucking in all the decls they need. \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) - `plusFV` maybe_double - where - get (ClassOpSig n _ _ ty _) - | n `elemNameSet` source_fvs = extractHsTyNames ty - | otherwise = emptyFVs - - -- If we load any numeric class that doesn't have - -- Int as an instance, add Double to the gates. - -- This takes account of the fact that Double might be needed for - -- defaulting, but we don't want to load Double (and all its baggage) - -- if the more exotic classes aren't used at all. - maybe_double | nameUnique cls `elem` fractionalClassKeys - = unitFV (getName doubleTyCon) - | 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 +closeIfaceDecls :: DynFlags + -> HomeIfaceTable -> HomeSymbolTable + -> PersistentCompilerState + -> ModIface -- Get the decls from here + -> IO (PersistentCompilerState, Bool, [RenamedHsDecl]) + -- True <=> errors happened +closeIfaceDecls dflags hit hst pcs + mod_iface@(ModIface { mi_module = mod, mi_decls = iface_decls }) + = runRn dflags hit hst pcs mod $ - 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} + let + rule_decls = dcl_rules iface_decls + inst_decls = dcl_insts iface_decls + tycl_decls = dcl_tycl iface_decls + decls = map RuleD rule_decls ++ + map InstD inst_decls ++ + map TyClD tycl_decls + needed = unionManyNameSets (map ruleDeclFVs rule_decls) `unionNameSets` + unionManyNameSets (map instDeclFVs inst_decls) `unionNameSets` + unionManyNameSets (map tyClDeclFVs tycl_decls) + local_names = foldl add emptyNameSet tycl_decls + add names decl = addListToNameSet names (map fst (tyClDeclSysNames decl ++ tyClDeclNames decl)) + in -@getWiredInGates@ is just like @getGates@, but it sees a wired-in @Name@ -rather than a declaration. + recordLocalSlurps local_names `thenRn_` -\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 + -- Do the transitive closure + closeDecls decls (needed `plusFV` implicit_fvs) `thenRn` \closed_decls -> + rnDump [] closed_decls `thenRn_` + returnRn closed_decls 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) + implicit_fvs = ubiquitousNames -- Data type decls with record selectors, + -- which may appear in the decls, need unpackCString + -- and friends. It's easier to just grab them right now. \end{code} -\begin{code} -getInstDeclGates (InstD (InstDecl inst_ty _ _ _ _)) = extractHsTyNames inst_ty -getInstDeclGates other = emptyFVs -\end{code} - - %********************************************************* %* * \subsection{Unused names} @@ -523,45 +618,185 @@ getInstDeclGates other = emptyFVs %********************************************************* \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_locals = [n | n <- defined_but_not_used, isLocallyDefined n] - bad_imps = [n | n <- defined_but_not_used, isUserImportedExplicitlyName n] - in - warnUnusedLocalBinds bad_locals `thenRn_` - warnUnusedImports bad_imps +reportUnusedNames :: ModIface -> PrintUnqualified + -> [RdrNameImportDecl] + -> AvailEnv + -> NameSet -- Used in this module + -> [RenamedHsDecl] + -> RnMG () +reportUnusedNames my_mod_iface unqual imports avail_env + used_names imported_decls + = warnUnusedModules unused_imp_mods `thenRn_` + warnUnusedLocalBinds bad_locals `thenRn_` + warnUnusedImports bad_imp_names `thenRn_` + printMinimalImports this_mod unqual minimal_imports + where + this_mod = mi_module my_mod_iface + gbl_env = mi_globals my_mod_iface + + -- 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 [ parent_name + | sub_name <- nameSetToList used_names + + -- Usually, every used name will appear in avail_env, but there + -- is one time when it doesn't: tuples and other built in syntax. When you + -- write (a,b) that gives rise to a *use* of "(,)", so that the + -- instances will get pulled in, but the tycon "(,)" isn't actually + -- in scope. Also, (-x) gives rise to an implicit use of 'negate'; + -- similarly, 3.5 gives rise to an implcit use of :% + -- Hence the silent 'False' in all other cases + + , Just parent_name <- [case lookupNameEnv avail_env sub_name of + Just (AvailTC n _) -> Just n + other -> Nothing] + ] + + -- Collect the defined names from the in-scope environment + -- Look for the qualified ones only, else get duplicates + defined_names :: [GlobalRdrElt] + defined_names = foldRdrEnv add [] gbl_env + add rdr_name ns acc | isQual rdr_name = ns ++ acc + | otherwise = acc + + defined_and_used, defined_but_not_used :: [GlobalRdrElt] + (defined_and_used, defined_but_not_used) = partition used defined_names + used (GRE name _ _) = name `elemNameSet` really_used_names + + -- Filter out the ones only defined implicitly + bad_locals :: [Name] + bad_locals = [n | (GRE n LocalDef _) <- defined_but_not_used] + + bad_imp_names :: [(Name,Provenance)] + bad_imp_names = [(n,p) | GRE n p@(NonLocalDef (UserImport mod _ True)) _ <- defined_but_not_used, + not (module_unused mod)] + + -- inst_mods are directly-imported modules that + -- contain instance decl(s) that the renamer decided to suck in + -- It's not necessarily redundant to import such modules. + -- + -- NOTE: Consider + -- module This + -- import M () + -- + -- The import M() is not *necessarily* redundant, even if + -- we suck in no instance decls from M (e.g. it contains + -- no instance decls, or This contains no code). It may be + -- that we import M solely to ensure that M's orphan instance + -- decls (or those in its imports) are visible to people who + -- import This. Sigh. + -- There's really no good way to detect this, so the error message + -- in RnEnv.warnUnusedModules is weakened instead + inst_mods :: [ModuleName] + inst_mods = [m | InstD (InstDecl _ _ _ (Just dfun) _) <- imported_decls, + let m = moduleName (nameModule dfun), + m `elem` direct_import_mods + ] + + -- To figure out the minimal set of imports, start with the things + -- that are in scope (i.e. in gbl_env). Then just combine them + -- into a bunch of avails, so they are properly grouped + minimal_imports :: FiniteMap ModuleName AvailEnv + minimal_imports0 = emptyFM + minimal_imports1 = foldr add_name minimal_imports0 defined_and_used + minimal_imports = foldr add_inst_mod minimal_imports1 inst_mods + + -- We've carefully preserved the provenance so that we can + -- construct minimal imports that import the name by (one of) + -- the same route(s) as the programmer originally did. + add_name (GRE n (NonLocalDef (UserImport m _ _)) _) acc = addToFM_C plusAvailEnv acc (moduleName m) + (unitAvailEnv (mk_avail n)) + add_name (GRE n other_prov _) acc = acc + + mk_avail n = case lookupNameEnv avail_env n of + Just (AvailTC m _) | n==m -> AvailTC n [n] + | otherwise -> AvailTC m [n,m] + Just avail -> Avail n + Nothing -> pprPanic "mk_avail" (ppr n) + + add_inst_mod m acc + | m `elemFM` acc = acc -- We import something already + | otherwise = addToFM acc m emptyAvailEnv + -- Add an empty collection of imports for a module + -- from which we have sucked only instance decls + + direct_import_mods :: [ModuleName] + direct_import_mods = nub [m | ImportDecl m _ _ _ _ _ <- imports] + + -- unused_imp_mods are the directly-imported modules + -- that are not mentioned in minimal_imports + unused_imp_mods = [m | m <- direct_import_mods, + not (maybeToBool (lookupFM minimal_imports m)), + m /= pRELUDE_Name] + + module_unused :: Module -> Bool + module_unused mod = moduleName mod `elem` unused_imp_mods + + +-- ToDo: deal with original imports with 'qualified' and 'as M' clauses +printMinimalImports :: Module -- This module + -> PrintUnqualified + -> FiniteMap ModuleName AvailEnv -- Minimal imports + -> RnMG () +printMinimalImports this_mod unqual imps + = ifOptRn Opt_D_dump_minimal_imports $ + + mapRn to_ies (fmToList imps) `thenRn` \ mod_ies -> + ioToRnM (do { h <- openFile filename WriteMode ; + printForUser h unqual (vcat (map ppr_mod_ie mod_ies)) + }) `thenRn_` + returnRn () + where + filename = moduleNameUserString (moduleName this_mod) ++ ".imports" + ppr_mod_ie (mod_name, ies) + | mod_name == pRELUDE_Name + = empty + | otherwise + = ptext SLIT("import") <+> ppr mod_name <> + parens (fsep (punctuate comma (map ppr ies))) + + to_ies (mod, avail_env) = mapRn to_ie (availEnvElts avail_env) `thenRn` \ ies -> + returnRn (mod, ies) + + to_ie :: AvailInfo -> RnMG (IE Name) + -- The main trick here is that if we're importing all the constructors + -- we want to say "T(..)", but if we're importing only a subset we want + -- to say "T(A,B,C)". So we have to find out what the module exports. + to_ie (Avail n) = returnRn (IEVar n) + to_ie (AvailTC n [m]) = ASSERT( n==m ) + returnRn (IEThingAbs n) + to_ie (AvailTC n ns) + = loadInterface (text "Compute minimal imports from" <+> ppr n_mod) n_mod ImportBySystem `thenRn` \ iface -> + case [xs | (m,as) <- mi_exports iface, + m == n_mod, + AvailTC x xs <- as, + x == n] of + [xs] | all (`elem` ns) xs -> returnRn (IEThingAll n) + | otherwise -> returnRn (IEThingWith n (filter (/= n) ns)) + other -> pprTrace "to_ie" (ppr n <+> ppr (nameModule n) <+> ppr other) $ + returnRn (IEVar n) + where + n_mod = moduleName (nameModule n) 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 ()) + -> RnMG () +rnDump imp_decls local_decls + = doptRn Opt_D_dump_rn_trace `thenRn` \ dump_rn_trace -> + doptRn Opt_D_dump_rn_stats `thenRn` \ dump_rn_stats -> + doptRn Opt_D_dump_rn `thenRn` \ dump_rn -> + getIfacesRn `thenRn` \ ifaces -> + + ioToRnM (do { dumpIfSet (dump_rn_trace || dump_rn_stats || dump_rn) + "Renamer statistics" + (getRnStats imp_decls ifaces) ; + + dumpIfSet dump_rn "Renamer:" + (vcat (map ppr (local_decls ++ imp_decls))) + }) `thenRn_` + + returnRn () \end{code} @@ -572,60 +807,55 @@ rnDump imp_decls decls %********************************************************* \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) +getRnStats :: [RenamedHsDecl] -> Ifaces -> SDoc +getRnStats imported_decls ifaces + = hcat [text "Renamer stats: ", stats] 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] + n_mods = length [() | _ <- moduleEnvElts (iPIT ifaces)] + -- This is really only right for a one-shot compile + + (decls_map, n_decls_slurped) = iDecls ifaces + + n_decls_left = length [decl | (avail, True, (_,decl)) <- nameEnvElts decls_map + -- 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 + ] + + (insts_left, n_insts_slurped) = iInsts ifaces + n_insts_left = length (bagToList insts_left) + + (rules_left, n_rules_slurped) = iRules ifaces + n_rules_left = length (bagToList rules_left) + + stats = vcat + [int n_mods <+> text "interfaces read", + hsep [ int n_decls_slurped, text "type/class/variable imported, out of", + int (n_decls_slurped + n_decls_left), text "read"], + hsep [ int n_insts_slurped, text "instance decls imported, out of", + int (n_insts_slurped + n_insts_left), text "read"], + hsep [ int n_rules_slurped, text "rule decls imported, out of", + int (n_rules_slurped + n_rules_left), text "read"] + ] \end{code} + +%************************************************************************ +%* * +\subsection{Errors and warnings} +%* * +%************************************************************************ + +\begin{code} +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] + +badDeprec d + = sep [ptext SLIT("Illegal deprecation when whole module is deprecated"), + nest 4 (ppr d)] +\end{code} + +