X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnMonad.lhs;h=f5d4641a99675ff06177e886eb18cc2ab4aec80d;hb=a237946da277f10bd3d223e5926d118044d24194;hp=1d3578a1d2a3d4f2644b5cd3aad122e68c752483;hpb=db85bf1cc51d2e428175ccf2f3608014e9459ba8;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnMonad.lhs b/ghc/compiler/rename/RnMonad.lhs index 1d3578a..f5d4641 100644 --- a/ghc/compiler/rename/RnMonad.lhs +++ b/ghc/compiler/rename/RnMonad.lhs @@ -6,10 +6,13 @@ \begin{code} module RnMonad( module RnMonad, + + module RdrName, -- Re-exports + module Name, -- from these two + Module, FiniteMap, Bag, - Name, RdrNameHsDecl, RdrNameInstDecl, Version, @@ -20,51 +23,42 @@ module RnMonad( #include "HsVersions.h" -import SST -import GlaExts ( RealWorld, stToIO ) -import List ( intersperse ) - +#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 405 +import IOExts ( fixIO ) +#elif defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 302 +import PrelIOBase ( fixIO ) -- Should be in GlaExts +#else +import IOBase ( fixIO ) +#endif +import IOExts ( IORef, newIORef, readIORef, writeIORef, unsafePerformIO ) + import HsSyn import RdrHsSyn import RnHsSyn ( RenamedFixitySig ) -import BasicTypes ( Version ) -import SrcLoc ( noSrcLoc ) +import BasicTypes ( Version, defaultFixity ) import ErrUtils ( addShortErrLocLine, addShortWarnLocLine, pprBagOfErrors, ErrMsg, WarnMsg, Message ) -import Name ( Name, OccName, NamedThing(..), - isLocallyDefinedName, nameModule, nameOccName, - decode +import RdrName ( RdrName, dummyRdrVarName, rdrNameModule, rdrNameOcc, + RdrNameEnv, emptyRdrEnv, extendRdrEnv, + lookupRdrEnv, addListToRdrEnv, rdrEnvToList, rdrEnvElts ) -import Module ( Module, IfaceFlavour, setModuleFlavour, mkSysModuleFS, - bootFlavour, moduleString, moduleIfaceFlavour, mkDynFlavour +import Name ( Name, OccName, NamedThing(..), getSrcLoc, + isLocallyDefinedName, nameModule, nameOccName, + decode, mkLocalName, mkUnboundName, mkKnownKeyGlobal, + NameEnv, lookupNameEnv, emptyNameEnv, unitNameEnv, extendNameEnvList ) +import Module ( Module, ModuleName, WhereFrom, moduleName ) import NameSet -import RdrName ( RdrName ) -import CmdLineOpts ( opt_D_show_rn_trace, opt_IgnoreIfacePragmas, - opt_WarnHiShadows, opt_Static - ) -import PrelInfo ( builtinNames ) -import TysWiredIn ( boolTyCon ) +import CmdLineOpts ( DynFlags, dopt_D_dump_rn_trace ) +import PrelInfo ( wiredInNames, knownKeyRdrNames ) import SrcLoc ( SrcLoc, mkGeneratedSrcLoc ) import Unique ( Unique ) -import UniqFM ( UniqFM ) -import FiniteMap ( FiniteMap, emptyFM, bagToFM, lookupFM, addToFM, addListToFM, - addListToFM_C, addToFM_C, eltsFM - ) +import FiniteMap ( FiniteMap, emptyFM, listToFM, plusFM ) import Bag ( Bag, mapBag, emptyBag, isEmptyBag, snocBag ) -import Maybes ( seqMaybe, mapMaybe ) -import UniqSet -import UniqFM import UniqSupply -import Util import Outputable -import DirUtils ( getDirectoryContents ) -import Directory ( doesFileExist ) -import IO ( hPutStrLn, stderr, isDoesNotExistError ) -import Monad ( foldM ) -import Maybe ( fromMaybe ) -import Constants ( interfaceFileFormatVersion ) +import CmFind ( Finder ) infixr 9 `thenRn`, `thenRn_` \end{code} @@ -77,18 +71,18 @@ infixr 9 `thenRn`, `thenRn_` %************************************************************************ \begin{code} -sstToIO :: SST RealWorld r -> IO r -sstToIO sst = stToIO (sstToST sst) - -ioToRnMG :: IO r -> RnMG (Either IOError r) -ioToRnMG io rn_down g_down = ioToSST io +ioToRnM :: IO r -> RnM d (Either IOError r) +ioToRnM io rn_down g_down = (io >>= \ ok -> return (Right ok)) + `catch` + (\ err -> return (Left err)) -traceRn :: SDoc -> RnMG () -traceRn msg | opt_D_show_rn_trace = putDocRn msg - | otherwise = returnRn () +traceRn :: SDoc -> RnM d () +traceRn msg + = doptsRn dopt_D_dump_rn_trace `thenRn` \b -> + if b then putDocRn msg else returnRn () -putDocRn :: SDoc -> RnMG () -putDocRn msg = ioToRnMG (printErrs msg) `thenRn_` +putDocRn :: SDoc -> RnM d () +putDocRn msg = ioToRnM (printErrs msg) `thenRn_` returnRn () \end{code} @@ -99,253 +93,227 @@ putDocRn msg = ioToRnMG (printErrs msg) `thenRn_` %* * %************************************************************************ -=================================================== - MONAD TYPES -=================================================== +%=================================================== +\subsubsection{ MONAD TYPES} +%=================================================== \begin{code} -type RnM s d r = RnDown s -> d -> SST s r -type RnMS s r = RnM s (SDown s) r -- Renaming source -type RnMG r = RnM RealWorld GDown r -- Getting global names etc -type SSTRWRef a = SSTRef RealWorld a -- ToDo: there ought to be a standard defn of this +type RnM d r = RnDown -> d -> IO r +type RnMS r = RnM SDown r -- Renaming source +type RnMG r = RnM () r -- Getting global names etc -- Common part -data RnDown s = RnDown { - rn_loc :: SrcLoc, - rn_omit :: Name -> Bool, -- True <=> omit qualifier when printing - rn_ns :: SSTRef s RnNameSupply, - rn_errs :: SSTRef s (Bag WarnMsg, Bag ErrMsg), - rn_occs :: SSTRef s ([Occurrence],[Occurrence]), -- Occurrences: compulsory and optional resp - rn_hi_map :: ModuleHiMap, -- for .hi files - rn_hiboot_map :: ModuleHiMap, -- for .hi-boot files - rn_mod :: Module - } +data RnDown + = RnDown { + rn_mod :: Module, -- This module + rn_loc :: SrcLoc, -- Current locn + + rn_finder :: Finder, + rn_dflags :: DynFlags, + rn_gst :: GlobalSymbolTable, -- Both home modules and packages, + -- at the moment we started compiling + -- this module + + rn_errs :: IORef (Bag WarnMsg, Bag ErrMsg), + rn_ns :: IORef NameSupply, + rn_ifaces :: IORef Ifaces + } -type Occurrence = (Name, SrcLoc) -- The srcloc is the occurrence site + -- For renaming source code +data SDown = SDown { + rn_mode :: RnMode, -data Necessity = Compulsory | Optional -- We *must* find definitions for - -- compulsory occurrences; we *may* find them - -- for optional ones. + rn_genv :: GlobalRdrEnv, -- Global envt - -- For getting global names -data GDown = GDown { - rn_ifaces :: SSTRWRef Ifaces - } + rn_lenv :: LocalRdrEnv, -- Local name envt + -- Does *not* include global name envt; may shadow it + -- Includes both ordinary variables and type variables; + -- they are kept distinct because tyvar have a different + -- occurrence contructor (Name.TvOcc) + -- We still need the unsullied global name env so that + -- we can look up record field names - -- For renaming source code -data SDown s = SDown { - rn_mode :: RnMode, - rn_genv :: RnEnv, -- Global envt; the fixity component gets extended - -- with local fixity decls - rn_lenv :: LocalRdrEnv -- Local name envt - -- Does *not* includes global name envt; may shadow it - -- Includes both ordinary variables and type variables; - -- they are kept distinct because tyvar have a different - -- occurrence contructor (Name.TvOcc) - -- We still need the unsullied global name env so that - -- we can look up record field names + rn_fixenv :: FixityEnv -- Local fixities + -- The global fixities are held in the + -- rn_ifaces field. Why? See the comments + -- with RnIfaces.lookupFixity } data RnMode = SourceMode -- Renaming source code | InterfaceMode -- Renaming interface declarations. - Necessity -- The "necessity" - -- flag says free variables *must* be found and slurped - -- or whether they need not be. For value signatures of - -- things that are themselves compulsorily imported - -- we arrange that the type signature is read - -- in compulsory mode, - -- but the pragmas in optional mode. - -type SearchPath = [(String,String)] -- List of (directory,suffix) pairs to search - -- for interface files. - -type ModuleHiMap = FiniteMap String (String, Bool) - -- mapping from module name to the file path of its corresponding - -- interface file. \end{code} -=================================================== - ENVIRONMENTS -=================================================== +%=================================================== +\subsubsection{ ENVIRONMENTS} +%=================================================== \begin{code} -------------------------------- -type RdrNameEnv a = FiniteMap RdrName a type GlobalRdrEnv = RdrNameEnv [Name] -- The list is because there may be name clashes -- These only get reported on lookup, -- not on construction type LocalRdrEnv = RdrNameEnv Name -emptyRdrEnv :: RdrNameEnv a -lookupRdrEnv :: RdrNameEnv a -> RdrName -> Maybe a -addListToRdrEnv :: RdrNameEnv a -> [(RdrName,a)] -> RdrNameEnv a - -emptyRdrEnv = emptyFM -lookupRdrEnv = lookupFM -addListToRdrEnv = addListToFM -rdrEnvElts = eltsFM - --------------------------------- -type NameEnv a = UniqFM a -- Domain is Name - -emptyNameEnv :: NameEnv a -nameEnvElts :: NameEnv a -> [a] -addToNameEnv_C :: (a->a->a) -> NameEnv a -> Name -> a -> NameEnv a -addToNameEnv :: NameEnv a -> Name -> a -> NameEnv a -plusNameEnv :: NameEnv a -> NameEnv a -> NameEnv a -extendNameEnv :: NameEnv a -> [(Name,a)] -> NameEnv a -lookupNameEnv :: NameEnv a -> Name -> Maybe a -delFromNameEnv :: NameEnv a -> Name -> NameEnv a -elemNameEnv :: Name -> NameEnv a -> Bool - -emptyNameEnv = emptyUFM -nameEnvElts = eltsUFM -addToNameEnv_C = addToUFM_C -addToNameEnv = addToUFM -plusNameEnv = plusUFM -extendNameEnv = addListToUFM -lookupNameEnv = lookupUFM -delFromNameEnv = delFromUFM -elemNameEnv = elemUFM - -------------------------------- type FixityEnv = NameEnv RenamedFixitySig - --------------------------------- -data RnEnv = RnEnv GlobalRdrEnv FixityEnv -emptyRnEnv = RnEnv emptyRdrEnv emptyNameEnv + -- We keep the whole fixity sig so that we + -- can report line-number info when there is a duplicate + -- fixity declaration + +lookupFixity :: FixityEnv -> Name -> Fixity +lookupFixity env name + = case lookupNameEnv env name of + Just (FixitySig _ fix _) -> fix + Nothing -> defaultFixity \end{code} \begin{code} --------------------------------- -type RnNameSupply - = ( UniqSupply - - , FiniteMap (OccName, OccName) Int - -- This is used as a name supply for dictionary functions - -- From the inst decl we derive a (class, tycon) pair; - -- this map then gives a unique int for each inst decl with that - -- (class, tycon) pair. (In Haskell 98 there can only be one, - -- but not so in more extended versions.) - -- - -- We could just use one Int for all the instance decls, but this - -- way the uniques change less when you add an instance decl, - -- hence less recompilation - - , FiniteMap (Module,OccName) Name - -- Ensures that one (module,occname) pair gets one unique - ) - +type ExportAvails = (FiniteMap ModuleName Avails, + -- Used to figure out "module M" export specifiers + -- Includes avails only from *unqualified* imports + -- (see 1.4 Report Section 5.1.1) --------------------------------- -data ExportEnv = ExportEnv Avails Fixities -type Avails = [AvailInfo] -type Fixities = [(Name, Fixity)] - -type ExportAvails = (FiniteMap Module Avails, -- Used to figure out "module M" export specifiers - -- Includes avails only from *unqualified* imports - -- (see 1.4 Report Section 5.1.1) - - NameEnv AvailInfo) -- Used to figure out all other export specifiers. - -- Maps a Name to the AvailInfo that contains it - - -data GenAvailInfo name = Avail name -- An ordinary identifier - | AvailTC name -- The name of the type or class - [name] -- The available pieces of type/class. NB: If the type or - -- class is itself to be in scope, it must be in this list. - -- Thus, typically: AvailTC Eq [Eq, ==, /=] -type AvailInfo = GenAvailInfo Name -type RdrAvailInfo = GenAvailInfo OccName + AvailEnv) -- Used to figure out all other export specifiers. \end{code} -=================================================== - INTERFACE FILE STUFF -=================================================== +%=================================================== +\subsubsection{ INTERFACE FILE STUFF} +%=================================================== \begin{code} -type ExportItem = (Module, [RdrAvailInfo]) -type VersionInfo name = [ImportVersion name] +type ExportItem = (ModuleName, [RdrAvailInfo]) -type ImportVersion name = (Module, Version, WhatsImported name) -data WhatsImported name = Everything - | Specifically [LocalVersion name] -- List guaranteed non-empty +type ImportVersion name = (ModuleName, WhetherHasOrphans, IsBootInterface, WhatsImported name) - -- ("M", hif, ver, Everything) means there was a "module M" in - -- this module's export list, so we just have to go by M's version, "ver", - -- not the list of LocalVersions. +type ModVersionInfo = (Version, -- Version of the whole module + Version, -- Version number for all fixity decls together + Version) -- ...ditto all rules together +type WhetherHasOrphans = Bool + -- An "orphan" is + -- * an instance decl in a module other than the defn module for + -- one of the tycons or classes in the instance head + -- * a transformation rule in a module other than the one defining + -- the function in the head of the rule. -type LocalVersion name = (name, Version) +type IsBootInterface = Bool -data ParsedIface - = ParsedIface - Version -- Module version number - [ImportVersion OccName] -- Usages - [ExportItem] -- Exports - [Module] -- Special instance modules - [(Version, RdrNameHsDecl)] -- Local definitions - [RdrNameInstDecl] -- Local instance declarations +data WhatsImported name = NothingAtAll -- The module is below us in the + -- hierarchy, but we import nothing -type InterfaceDetails = (VersionInfo Name, -- Version information for what this module imports - ExportEnv, -- What this module exports - [Module]) -- Instance modules + | Everything Version -- The module version + | Specifically Version -- Module version + Version -- Fixity version + Version -- Rules version + [(name,Version)] -- List guaranteed non-empty + deriving( Eq ) + -- 'Specifically' doesn't let you say "I imported f but none of the fixities in + -- the module". If you use anything in the module you get its fixity and rule version + -- So if the fixities or rules change, you'll recompile, even if you don't use either. + -- This is easy to implement, and it's safer: you might not have used the rules last + -- time round, but if someone has added a new rule you might need it this time --- needed by Main to fish out the fixities assoc list. -getIfaceFixities :: InterfaceDetails -> Fixities -getIfaceFixities (_, ExportEnv _ fs, _) = fs + -- 'Everything' means there was a "module M" in + -- this module's export list, so we just have to go by M's version, + -- not the list of (name,version) pairs + +data ParsedIface + = ParsedIface { + pi_mod :: Module, -- Complete with package info + pi_vers :: Version, -- Module version number + pi_orphan :: WhetherHasOrphans, -- Whether this module has orphans + pi_usages :: [ImportVersion OccName], -- Usages + pi_exports :: [ExportItem], -- Exports + pi_insts :: [RdrNameInstDecl], -- Local instance declarations + pi_decls :: [(Version, RdrNameHsDecl)], -- Local definitions + pi_fixity :: (Version, [RdrNameFixitySig]), -- Local fixity declarations, with their version + pi_rules :: (Version, [RdrNameRuleDecl]), -- Rules, with their version + pi_deprecs :: [RdrNameDeprecation] -- Deprecations + } type RdrNamePragma = () -- Fudge for now ------------------- -data Ifaces = Ifaces { - iMod :: Module, -- Name of the module being compiled - - iModMap :: FiniteMap Module (IfaceFlavour, -- Exports - Version, - Avails), - - iDecls :: DeclsMap, -- A single, global map of Names to decls - - iFixes :: FixityEnv, -- A single, global map of Names to fixities - - iSlurp :: NameSet, -- All the names (whether "big" or "small", whether wired-in or not, - -- whether locally defined or not) that have been slurped in so far. +\end{code} - iVSlurp :: [(Name,Version)], -- All the (a) non-wired-in (b) "big" (c) non-locally-defined names that - -- have been slurped in so far, with their versions. - -- This is used to generate the "usage" information for this module. - -- Subset of the previous field. +%************************************************************************ +%* * +\subsection{The renamer state} +%* * +%************************************************************************ - iDefInsts :: (Bag IfaceInst, NameSet), - -- The as-yet un-slurped instance decls; this bag is depleted when we - -- slurp an instance decl so that we don't slurp the same one twice. - -- Together with them is the set of tycons/classes that may allow - -- the instance decls in. +\begin{code} +data Ifaces = Ifaces { - iDefData :: NameEnv (Module, RdrNameTyClDecl), - -- Deferred data type declarations; each has the following properties - -- * it's a data type decl - -- * its TyCon is needed - -- * the decl may or may not have been slurped, depending on whether any - -- of the constrs are needed. + -- PERSISTENT FIELDS + iImpModInfo :: ImportedModuleInfo, + -- Modules this one depends on: that is, the union + -- of the modules its *direct* imports depend on. + -- NB: The direct imports have .hi files that enumerate *all* the + -- dependencies (direct or not) of the imported module. - iInstMods :: [Module] -- Set of modules with "special" instance declarations - -- Excludes this module + iDecls :: DeclsMap, -- A single, global map of Names to decls + -- we can get away with importing them abstractly + + iInsts :: IfaceInsts, + -- The as-yet un-slurped instance decls; this bag is depleted when we + -- slurp an instance decl so that we don't slurp the same one twice. + -- Each is 'gated' by the names that must be available before + -- this instance decl is needed. + + iRules :: IfaceRules, + -- Similar to instance decls, only for rules + + -- SEMI-EPHEMERAL FIELDS + -- iFixes and iDeprecs are accumulated here while one module + -- is compiled, but are transferred to the package symbol table + -- at the end. We don't add them to the table as we encounter them + -- because doing so would require us to have a mutable symbol table + -- which is yukky. + + iFixes :: FixityEnv, -- A single, global map of Names to fixities + -- See comments with RnIfaces.lookupFixity + iDeprecs :: DeprecationEnv, + + -- EPHEMERAL FIELDS + -- These fields persist during the compilation of a single module only + + iSlurp :: NameSet, + -- All the names (whether "big" or "small", whether wired-in or not, + -- whether locally defined or not) that have been slurped in so far. + + iVSlurp :: [(Name,Version)] + -- All the (a) non-wired-in (b) "big" (c) non-locally-defined + -- names that have been slurped in so far, with their versions. + -- This is used to generate the "usage" information for this module. + -- Subset of the previous field. } - -type DeclsMap = NameEnv (Version, AvailInfo, RdrNameHsDecl, Bool) - -- A DeclsMap contains a binding for each Name in the declaration - -- including the constructors of a type decl etc. - -- The Bool is True just for the 'main' Name. - -type IfaceInst = ((Module, RdrNameInstDecl), -- Instance decl - NameSet) -- "Gate" names. Slurp this instance decl when this - -- set becomes empty. It's depleted whenever we - -- slurp another type or class decl. +type ImportedModuleInfo + = FiniteMap ModuleName (WhetherHasOrphans, IsBootInterface, + Maybe (Module, Version, Version, Version, WhereFrom, Avails)) + -- The three Versions are module version, fixity version, rules version + + -- Suppose the domain element is module 'A' + -- + -- The first Bool is True if A contains + -- 'orphan' rules or instance decls + + -- The second Bool is true if the interface file actually + -- read was an .hi-boot file + + -- Nothing => A's interface not yet read, but this module has + -- imported a module, B, that itself depends on A + -- + -- Just xx => A's interface has been read. The Module in + -- the Just has the correct Dll flag + + -- This set is used to decide whether to look for + -- A.hi or A.hi-boot when importing A.f. + -- Basically, we look for A.hi if A is in the map, and A.hi-boot + -- otherwise \end{code} @@ -356,196 +324,117 @@ type IfaceInst = ((Module, RdrNameInstDecl), -- Instance decl %************************************************************************ \begin{code} -initRn :: Module -> UniqSupply -> SearchPath -> SrcLoc - -> RnMG r - -> IO (r, Bag ErrMsg, Bag WarnMsg) - -initRn mod us dirs loc do_rn = do - names_var <- sstToIO (newMutVarSST (us, emptyFM, builtins)) - errs_var <- sstToIO (newMutVarSST (emptyBag,emptyBag)) - iface_var <- sstToIO (newMutVarSST (emptyIfaces mod)) - occs_var <- sstToIO (newMutVarSST initOccs) - (himap, hibmap) <- mkModuleHiMaps dirs +initRn :: DynFlags -> Finder -> GlobalSymbolTable + -> PersistentRenamerState + -> Module -> SrcLoc + +initRn dflags finder gst prs mod loc do_rn = do + himaps <- mkModuleHiMaps dirs + names_var <- newIORef (prsNS pcs) + errs_var <- newIORef (emptyBag,emptyBag) + iface_var <- newIORef (initIfaces prs) let - rn_down = RnDown { rn_loc = loc, rn_omit = \n -> False, rn_ns = names_var, - rn_errs = errs_var, rn_occs = occs_var, - rn_hi_map = himap, rn_hiboot_map = hibmap, - rn_mod = mod } - g_down = GDown {rn_ifaces = iface_var } + rn_down = RnDown { rn_mod = mod, + rn_loc = loc, + + rn_finder = finder, + rn_dflags = dflags, + rn_gst = gst, + + rn_ns = names_var, + rn_errs = errs_var, + rn_ifaces = iface_var, + } -- do the business - res <- sstToIO (do_rn rn_down g_down) + res <- do_rn rn_down () -- grab errors and return - (warns, errs) <- sstToIO (readMutVarSST errs_var) + (warns, errs) <- readIORef errs_var + return (res, errs, warns) -initRnMS :: RnEnv -> RnMode -> RnMS RealWorld r -> RnMG r -initRnMS rn_env mode m rn_down g_down +initIfaces :: PersistentRenamerState -> Ifaces +initIfaces prs + = Ifaces { iDecls = prsDecls prs, + iInsts = prsInsts prs, + iRules = prsRules rules, + + iFixes = emptyNameEnv, + iDeprecs = emptyNameEnv, + + iImpModInfo = emptyFM, + iDeferred = emptyNameSet, + iSlurp = unitNameSet (mkUnboundName dummyRdrVarName), + -- Pretend that the dummy unbound name has already been + -- slurped. This is what's returned for an out-of-scope name, + -- and we don't want thereby to try to suck it in! + iVSlurp = [] + } + + +initRnMS :: GlobalRdrEnv -> FixityEnv -> RnMode -> RnMS r -> RnM d r +initRnMS rn_env fixity_env mode thing_inside rn_down g_down = let - s_down = SDown { rn_genv = rn_env, rn_lenv = emptyRdrEnv, rn_mode = mode } + s_down = SDown { rn_genv = rn_env, rn_lenv = emptyRdrEnv, + rn_fixenv = fixity_env, rn_mode = mode } in - m rn_down s_down - - -emptyIfaces :: Module -> Ifaces -emptyIfaces mod = Ifaces { iMod = mod, - iModMap = emptyFM, - iDecls = emptyNameEnv, - iFixes = emptyNameEnv, - iSlurp = emptyNameSet, - iVSlurp = [], - iDefInsts = (emptyBag, emptyNameSet), - iDefData = emptyNameEnv, - iInstMods = [] - } + thing_inside rn_down s_down -builtins :: FiniteMap (Module,OccName) Name -builtins = bagToFM $ - mapBag (\ name -> ((nameModule name, nameOccName name), name)) - builtinNames - - -- Initial value for the occurrence pool. -initOccs :: ([Occurrence],[Occurrence]) -- Compulsory and optional respectively -initOccs = ([(getName boolTyCon, noSrcLoc)], []) - -- Booleans occur implicitly a lot, so it's tiresome to keep recording the fact, and - -- rather implausible that not one will be used in the module. - -- We could add some other common types, notably lists, but the general idea is - -- to do as much as possible explicitly. -\end{code} +initIfaceRnMS :: Module -> RnMS r -> RnM d r +initIfaceRnMS mod thing_inside + = initRnMS emptyRdrEnv emptyNameEnv InterfaceMode $ + setModuleRn mod thing_inside -We (allege) that it is quicker to build up a mapping from module names -to the paths to their corresponding interface files once, than to search -along the import part every time we slurp in a new module (which we -do quite a lot of.) - -\begin{code} -mkModuleHiMaps :: SearchPath -> IO (ModuleHiMap, ModuleHiMap) -mkModuleHiMaps dirs = foldM (getAllFilesMatching dirs) (env,env) dirs - where - env = emptyFM - -{- a pseudo file which signals that the interface files - contained in a particular directory have got their - corresponding object codes stashed away in a DLL - - This stuff is only needed to deal with Win32 DLLs, - and conceivably we conditionally compile in support - for handling it. (ToDo?) --} -dir_contain_dll_his = "dLL_ifs.hi" - -getAllFilesMatching :: SearchPath - -> (ModuleHiMap, ModuleHiMap) - -> (FilePath, String) - -> IO (ModuleHiMap, ModuleHiMap) -getAllFilesMatching dirs hims (dir_path, suffix) = ( do - -- fpaths entries do not have dir_path prepended - fpaths <- getDirectoryContents dir_path - is_dyns <- catch - (if opt_Static || dir_path == "." then - return False - else - doesFileExist (dir_path ++ '/': dir_contain_dll_his)) - (\ _ {-don't care-} -> return False) - return (foldl (addModules is_dyns) hims fpaths) - ) -- soft failure - `catch` - (\ err -> do - hPutStrLn stderr - ("Import path element `" ++ dir_path ++ - if (isDoesNotExistError err) then - "' does not exist, ignoring." - else - "' couldn't read, ignoring.") - - return hims - ) - where - xiffus = reverse dotted_suffix - - dotted_suffix = - case suffix of - [] -> [] - ('.':xs) -> suffix - ls -> '.':ls - - hi_boot_version_xiffus = - reverse (show interfaceFileFormatVersion) ++ '-':hi_boot_xiffus - hi_boot_xiffus = "toob-ih." -- .hi-boot reversed. - - addModules is_dll his@(hi_env, hib_env) nm = fromMaybe his $ - FMAP (\ (mod_nm,v) -> (addToFM_C addNewOne hi_env mod_nm (v, is_dll), hib_env)) - (go xiffus rev_nm) `seqMaybe` - - FMAP (\ (mod_nm,v) -> (hi_env, addToFM_C overrideNew hib_env mod_nm (v,is_dll))) - (go hi_boot_version_xiffus rev_nm) `seqMaybe` - - FMAP (\ (mod_nm,v) -> (hi_env, addToFM_C addNewOne hib_env mod_nm (v,is_dll))) - (go hi_boot_xiffus rev_nm) - where - rev_nm = reverse nm - - go [] xs = Just (reverse xs, dir_path ++'/':nm) - go _ [] = Nothing - go (x:xs) (y:ys) - | x == y = go xs ys - | otherwise = Nothing - - addNewOne - | opt_WarnHiShadows = conflict - | otherwise = stickWithOld - - stickWithOld old new = old - overrideNew old new = new - - conflict old_path new_path - | old_path /= new_path = - pprTrace "Warning: " (text "Identically named interface files present on the import path, " $$ - text (show old_path) <+> text "shadows" $$ - text (show new_path) $$ - text "on the import path: " <+> - text (concat (intersperse ":" (map fst dirs)))) - old_path - | otherwise = old_path -- don't warn about innocous shadowings. +builtins :: FiniteMap (ModuleName,OccName) Name +builtins = listToFM wired_in `plusFM` listToFM known_key + where + wired_in = [ ((moduleName (nameModule name), nameOccName name), name) + | name <- wiredInNames ] + known_key = [ ((rdrNameModule rdr_name, rdrNameOcc rdr_name), mkKnownKeyGlobal rdr_name uniq) + | (rdr_name, uniq) <- knownKeyRdrNames ] \end{code} +@renameSourceCode@ is used to rename stuff ``out-of-line''; +that is, not as part of the main renamer. +Sole examples: derived definitions, +which are only generated in the type checker. -@renameSourceCode@ is used to rename stuff "out-of-line"; that is, not as part of -the main renamer. Examples: pragmas (which we don't want to rename unless -we actually explore them); and derived definitions, which are only generated -in the type checker. - -The @RnNameSupply@ includes a @UniqueSupply@, so if you call it more than +The @NameSupply@ includes a @UniqueSupply@, so if you call it more than once you must either split it, or install a fresh unique supply. \begin{code} -renameSourceCode :: Module +renameSourceCode :: DynFlags + -> Module -> RnNameSupply - -> RnMS RealWorld r + -> RnMS r -> r --- Alas, we can't use the real runST, with the desired signature: --- renameSourceCode :: RnNameSupply -> RnMS s r -> r --- because we can't manufacture "new versions of runST". +renameSourceCode dflags mod name_supply m + = unsafePerformIO ( + -- It's not really unsafe! When renaming source code we + -- only do any I/O if we need to read in a fixity declaration; + -- and that doesn't happen in pragmas etc -renameSourceCode mod_name name_supply m - = runSST ( - newMutVarSST name_supply `thenSST` \ names_var -> - newMutVarSST (emptyBag,emptyBag) `thenSST` \ errs_var -> - newMutVarSST ([],[]) `thenSST` \ occs_var -> + newIORef name_supply >>= \ names_var -> + newIORef (emptyBag,emptyBag) >>= \ errs_var -> let - rn_down = RnDown { rn_loc = mkGeneratedSrcLoc, rn_ns = names_var, - rn_errs = errs_var, rn_occs = occs_var, - rn_mod = mod_name } - s_down = SDown { rn_mode = InterfaceMode Compulsory, - rn_genv = emptyRnEnv, rn_lenv = emptyRdrEnv } + rn_down = RnDown { rn_dflags = dflags, + rn_loc = mkGeneratedSrcLoc, rn_ns = names_var, + rn_errs = errs_var, + rn_mod = mod, + rn_ifaces = panic "rnameSourceCode: rn_ifaces" -- Not required + } + s_down = SDown { rn_mode = InterfaceMode, + -- So that we can refer to PrelBase.True etc + rn_genv = emptyRdrEnv, rn_lenv = emptyRdrEnv, + rn_fixenv = emptyNameEnv } in - m rn_down s_down `thenSST` \ result -> + m rn_down s_down >>= \ result -> - readMutVarSST errs_var `thenSST` \ (warns,errs) -> + readIORef errs_var >>= \ (warns,errs) -> (if not (isEmptyBag errs) then pprTrace "Urk! renameSourceCode found errors" (display errs) @@ -556,7 +445,7 @@ renameSourceCode mod_name name_supply m else id) $ - returnSST result + return result ) where display errs = pprBagOfErrors errs @@ -566,25 +455,27 @@ renameSourceCode mod_name name_supply m {-# INLINE returnRn #-} {-# INLINE andRn #-} -returnRn :: a -> RnM s d a -thenRn :: RnM s d a -> (a -> RnM s d b) -> RnM s d b -thenRn_ :: RnM s d a -> RnM s d b -> RnM s d b -andRn :: (a -> a -> a) -> RnM s d a -> RnM s d a -> RnM s d a -mapRn :: (a -> RnM s d b) -> [a] -> RnM s d [b] -mapMaybeRn :: (a -> RnM s d (Maybe b)) -> [a] -> RnM s d [b] -sequenceRn :: [RnM s d a] -> RnM s d [a] -foldlRn :: (b -> a -> RnM s d b) -> b -> [a] -> RnM s d b -mapAndUnzipRn :: (a -> RnM s d (b,c)) -> [a] -> RnM s d ([b],[c]) -fixRn :: (a -> RnM s d a) -> RnM s d a - -returnRn v gdown ldown = returnSST v -thenRn m k gdown ldown = m gdown ldown `thenSST` \ r -> k r gdown ldown -thenRn_ m k gdown ldown = m gdown ldown `thenSST_` k gdown ldown -fixRn m gdown ldown = fixSST (\r -> m r gdown ldown) +returnRn :: a -> RnM d a +thenRn :: RnM d a -> (a -> RnM d b) -> RnM d b +thenRn_ :: RnM d a -> RnM d b -> RnM d b +andRn :: (a -> a -> a) -> RnM d a -> RnM d a -> RnM d a +mapRn :: (a -> RnM d b) -> [a] -> RnM d [b] +mapRn_ :: (a -> RnM d b) -> [a] -> RnM d () +mapMaybeRn :: (a -> RnM d (Maybe b)) -> [a] -> RnM d [b] +flatMapRn :: (a -> RnM d [b]) -> [a] -> RnM d [b] +sequenceRn :: [RnM d a] -> RnM d [a] +foldlRn :: (b -> a -> RnM d b) -> b -> [a] -> RnM d b +mapAndUnzipRn :: (a -> RnM d (b,c)) -> [a] -> RnM d ([b],[c]) +fixRn :: (a -> RnM d a) -> RnM d a + +returnRn v gdown ldown = return v +thenRn m k gdown ldown = m gdown ldown >>= \ r -> k r gdown ldown +thenRn_ m k gdown ldown = m gdown ldown >> k gdown ldown +fixRn m gdown ldown = fixIO (\r -> m r gdown ldown) andRn combiner m1 m2 gdown ldown - = m1 gdown ldown `thenSST` \ res1 -> - m2 gdown ldown `thenSST` \ res2 -> - returnSST (combiner res1 res2) + = m1 gdown ldown >>= \ res1 -> + m2 gdown ldown >>= \ res2 -> + return (combiner res1 res2) sequenceRn [] = returnRn [] sequenceRn (m:ms) = m `thenRn` \ r -> @@ -597,6 +488,11 @@ mapRn f (x:xs) mapRn f xs `thenRn` \ rs -> returnRn (r:rs) +mapRn_ f [] = returnRn () +mapRn_ f (x:xs) = + f x `thenRn_` + mapRn_ f xs + foldlRn k z [] = returnRn z foldlRn k z (x:xs) = k z x `thenRn` \ z' -> foldlRn k z' xs @@ -619,6 +515,11 @@ mapMaybeRn f (x:xs) = f x `thenRn` \ maybe_r -> case maybe_r of Nothing -> returnRn rs Just r -> returnRn (r:rs) + +flatMapRn f [] = returnRn [] +flatMapRn f (x:xs) = f x `thenRn` \ r -> + flatMapRn f xs `thenRn` \ rs -> + returnRn (r ++ rs) \end{code} @@ -630,213 +531,103 @@ mapMaybeRn f (x:xs) = f x `thenRn` \ maybe_r -> %************************************************************************ -================ Errors and warnings ===================== +%================ +\subsubsection{ Errors and warnings} +%===================== \begin{code} -failWithRn :: a -> Message -> RnM s d a +failWithRn :: a -> Message -> RnM d a failWithRn res msg (RnDown {rn_errs = errs_var, rn_loc = loc}) l_down - = readMutVarSST errs_var `thenSST` \ (warns,errs) -> - writeMutVarSST errs_var (warns, errs `snocBag` err) `thenSST_` - returnSST res + = readIORef errs_var >>= \ (warns,errs) -> + writeIORef errs_var (warns, errs `snocBag` err) >> + return res where err = addShortErrLocLine loc msg -warnWithRn :: a -> Message -> RnM s d a +warnWithRn :: a -> Message -> RnM d a warnWithRn res msg (RnDown {rn_errs = errs_var, rn_loc = loc}) l_down - = readMutVarSST errs_var `thenSST` \ (warns,errs) -> - writeMutVarSST errs_var (warns `snocBag` warn, errs) `thenSST_` - returnSST res + = readIORef errs_var >>= \ (warns,errs) -> + writeIORef errs_var (warns `snocBag` warn, errs) >> + return res where warn = addShortWarnLocLine loc msg -addErrRn :: Message -> RnM s d () +addErrRn :: Message -> RnM d () addErrRn err = failWithRn () err -checkRn :: Bool -> Message -> RnM s d () -- Check that a condition is true +checkRn :: Bool -> Message -> RnM d () -- Check that a condition is true checkRn False err = addErrRn err checkRn True err = returnRn () -warnCheckRn :: Bool -> Message -> RnM s d () -- Check that a condition is true +warnCheckRn :: Bool -> Message -> RnM d () -- Check that a condition is true warnCheckRn False err = addWarnRn err warnCheckRn True err = returnRn () -addWarnRn :: Message -> RnM s d () +addWarnRn :: Message -> RnM d () addWarnRn warn = warnWithRn () warn -checkErrsRn :: RnM s d Bool -- True <=> no errors so far +checkErrsRn :: RnM d Bool -- True <=> no errors so far checkErrsRn (RnDown {rn_errs = errs_var}) l_down - = readMutVarSST errs_var `thenSST` \ (warns,errs) -> - returnSST (isEmptyBag errs) + = readIORef errs_var >>= \ (warns,errs) -> + return (isEmptyBag errs) + +doptsRn :: (DynFlags -> Bool) -> RnM d Bool +doptsRn dopt (RnDown { rn_dflags = dflags}) l_down + = return (dopt dflags) \end{code} -================ Source location ===================== +%================ +\subsubsection{ Source location} +%===================== \begin{code} -pushSrcLocRn :: SrcLoc -> RnM s d a -> RnM s d a +pushSrcLocRn :: SrcLoc -> RnM d a -> RnM d a pushSrcLocRn loc' m down l_down = m (down {rn_loc = loc'}) l_down -getSrcLocRn :: RnM s d SrcLoc +getSrcLocRn :: RnM d SrcLoc getSrcLocRn down l_down - = returnSST (rn_loc down) + = return (rn_loc down) \end{code} -================ Name supply ===================== +%================ +\subsubsection{ Name supply} +%===================== \begin{code} -getNameSupplyRn :: RnM s d RnNameSupply +getNameSupplyRn :: RnM d NameSupply getNameSupplyRn rn_down l_down - = readMutVarSST (rn_ns rn_down) + = readIORef (rn_ns rn_down) -setNameSupplyRn :: RnNameSupply -> RnM s d () +setNameSupplyRn :: NameSupply -> RnM d () setNameSupplyRn names' (RnDown {rn_ns = names_var}) l_down - = writeMutVarSST names_var names' - --- See comments with RnNameSupply above. -newInstUniq :: (OccName, OccName) -> RnM s d Int -newInstUniq key (RnDown {rn_ns = names_var}) l_down - = readMutVarSST names_var `thenSST` \ (us, mapInst, cache) -> - let - uniq = case lookupFM mapInst key of - Just x -> x+1 - Nothing -> 0 - mapInst' = addToFM mapInst key uniq - in - writeMutVarSST names_var (us, mapInst', cache) `thenSST_` - returnSST uniq + = writeIORef names_var names' -getUniqRn :: RnM s d Unique +getUniqRn :: RnM d Unique getUniqRn (RnDown {rn_ns = names_var}) l_down - = readMutVarSST names_var `thenSST` \ (us, mapInst, cache) -> + = readIORef names_var >>= \ (us, cache, ipcache) -> let (us1,us') = splitUniqSupply us in - writeMutVarSST names_var (us', mapInst, cache) `thenSST_` - returnSST (uniqFromSupply us1) + writeIORef names_var (us', cache, ipcache) >> + return (uniqFromSupply us1) \end{code} -================ Occurrences ===================== - -Every time we get an occurrence of a name we put it in one of two lists: - one for "compulsory" occurrences - one for "optional" occurrences - -The significance of "compulsory" is - (a) we *must* find the declaration - (b) in the case of type or class names, the name is part of the - source level program, and we must slurp in any instance decls - involving it. - -We don't need instance decls "optional" names, because the type inference -process will never come across them. Optional names are buried inside -type checked (but not renamed) cross-module unfoldings and such. - -The pair of lists is held in a mutable variable in RnDown. - -The lists are kept separate so that we can process all the compulsory occurrences -before any of the optional ones. Why? Because suppose we processed an optional -"g", and slurped an interface decl of g::T->T. Then we'd rename the type T->T in -optional mode. But if we later need g compulsorily we'll find that it's already -been slurped and will do nothing. We could, I suppose, rename it a second time, -but it seems simpler just to do all the compulsory ones first. +%================ +\subsubsection{ Module} +%===================== \begin{code} -addOccurrenceName :: Name -> RnMS s Name -- Same name returned as passed -addOccurrenceName name (RnDown {rn_loc = loc, rn_occs = occs_var}) - (SDown {rn_mode = mode}) - | isLocallyDefinedName name || - not_necessary necessity - = returnSST name - - | otherwise - = readMutVarSST occs_var `thenSST` \ (comp_occs, opt_occs) -> - let - new_occ_pair = case necessity of - Optional -> (comp_occs, (name,loc):opt_occs) - Compulsory -> ((name,loc):comp_occs, opt_occs) - in - writeMutVarSST occs_var new_occ_pair `thenSST_` - returnSST name - where - necessity = modeToNecessity mode - +getModuleRn :: RnM d Module +getModuleRn (RnDown {rn_mod = mod}) l_down + = return mod -addOccurrenceNames :: [Name] -> RnMS s () -addOccurrenceNames names (RnDown {rn_loc = loc, rn_occs = occs_var}) - (SDown {rn_mode = mode}) - | not_necessary necessity - = returnSST () - - | otherwise - = readMutVarSST occs_var `thenSST` \ (comp_occs, opt_occs) -> - let - new_occ_pair = case necessity of - Optional -> (comp_occs, non_local_occs ++ opt_occs) - Compulsory -> (non_local_occs ++ comp_occs, opt_occs) - in - writeMutVarSST occs_var new_occ_pair - where - non_local_occs = [(name, loc) | name <- names, not (isLocallyDefinedName name)] - necessity = modeToNecessity mode - - -- Never look for optional things if we're - -- ignoring optional input interface information -not_necessary Compulsory = False -not_necessary Optional = opt_IgnoreIfacePragmas - -popOccurrenceName :: RnMode -> RnM s d (Maybe Occurrence) -popOccurrenceName mode (RnDown {rn_occs = occs_var}) l_down - = readMutVarSST occs_var `thenSST` \ occs -> - case (mode, occs) of - -- Find a compulsory occurrence - (InterfaceMode Compulsory, (comp:comps, opts)) - -> writeMutVarSST occs_var (comps, opts) `thenSST_` - returnSST (Just comp) - - -- Find an optional occurrence - -- We shouldn't be looking unless we've done all the compulsories - (InterfaceMode Optional, (comps, opt:opts)) - -> ASSERT2( null comps, ppr comps ) - writeMutVarSST occs_var (comps, opts) `thenSST_` - returnSST (Just opt) - - -- No suitable occurrence - other -> returnSST Nothing - --- discardOccurrencesRn does the enclosed thing with a *fresh* occurrences --- variable, and discards the list of occurrences thus found. It's useful --- when loading instance decls and specialisation signatures, when we want to --- know the names of the things in the types, but we don't want to treat them --- as occurrences. - -discardOccurrencesRn :: RnM s d a -> RnM s d a -discardOccurrencesRn enclosed_thing rn_down l_down - = newMutVarSST ([],[]) `thenSST` \ new_occs_var -> - enclosed_thing (rn_down {rn_occs = new_occs_var}) l_down -\end{code} - - -================ Module ===================== - -\begin{code} -getModuleRn :: RnM s d Module -getModuleRn (RnDown {rn_mod = mod_name}) l_down - = returnSST mod_name - -setModuleRn :: Module -> RnM s d a -> RnM s d a +setModuleRn :: Module -> RnM d a -> RnM d a setModuleRn new_mod enclosed_thing rn_down l_down = enclosed_thing (rn_down {rn_mod = new_mod}) l_down \end{code} -\begin{code} -setOmitQualFn :: (Name -> Bool) -> RnM s d a -> RnM s d a -setOmitQualFn fn m g_down l_down = m (g_down { rn_omit = fn }) l_down - -getOmitQualFn :: RnM s d (Name -> Bool) -getOmitQualFn (RnDown {rn_omit = omit_fn}) l_down - = returnSST omit_fn -\end{code} %************************************************************************ %* * @@ -844,42 +635,50 @@ getOmitQualFn (RnDown {rn_omit = omit_fn}) l_down %* * %************************************************************************ -================ RnEnv ===================== +%================ +\subsubsection{ RnEnv} +%===================== \begin{code} -getNameEnvs :: RnMS s (GlobalRdrEnv, LocalRdrEnv) -getNameEnvs rn_down (SDown {rn_genv = RnEnv global_env fixity_env, rn_lenv = local_env}) - = returnSST (global_env, local_env) +getNameEnvs :: RnMS (GlobalRdrEnv, LocalRdrEnv) +getNameEnvs rn_down (SDown {rn_genv = global_env, rn_lenv = local_env}) + = return (global_env, local_env) -getLocalNameEnv :: RnMS s LocalRdrEnv +getLocalNameEnv :: RnMS LocalRdrEnv getLocalNameEnv rn_down (SDown {rn_lenv = local_env}) - = returnSST local_env + = return local_env -setLocalNameEnv :: LocalRdrEnv -> RnMS s a -> RnMS s a +getGlobalNameEnv :: RnMS GlobalRdrEnv +getGlobalNameEnv rn_down (SDown {rn_genv = global_env}) + = return global_env + +setLocalNameEnv :: LocalRdrEnv -> RnMS a -> RnMS a setLocalNameEnv local_env' m rn_down l_down = m rn_down (l_down {rn_lenv = local_env'}) -getFixityEnv :: RnMS s FixityEnv -getFixityEnv rn_down (SDown {rn_genv = RnEnv name_env fixity_env}) - = returnSST fixity_env +getFixityEnv :: RnMS FixityEnv +getFixityEnv rn_down (SDown {rn_fixenv = fixity_env}) + = return fixity_env -extendFixityEnv :: [(Name, RenamedFixitySig)] -> RnMS s a -> RnMS s a +extendFixityEnv :: [(Name, RenamedFixitySig)] -> RnMS a -> RnMS a extendFixityEnv fixes enclosed_scope - rn_down l_down@(SDown {rn_genv = RnEnv name_env fixity_env}) + rn_down l_down@(SDown {rn_fixenv = fixity_env}) = let - new_fixity_env = extendNameEnv fixity_env fixes + new_fixity_env = extendNameEnvList fixity_env fixes in - enclosed_scope rn_down (l_down {rn_genv = RnEnv name_env new_fixity_env}) + enclosed_scope rn_down (l_down {rn_fixenv = new_fixity_env}) \end{code} -================ Mode ===================== +%================ +\subsubsection{ Mode} +%===================== \begin{code} -getModeRn :: RnMS s RnMode +getModeRn :: RnMS RnMode getModeRn rn_down (SDown {rn_mode = mode}) - = returnSST mode + = return mode -setModeRn :: RnMode -> RnMS s a -> RnMS s a +setModeRn :: RnMode -> RnMS a -> RnMS a setModeRn new_mode thing_inside rn_down l_down = thing_inside rn_down (l_down {rn_mode = new_mode}) \end{code} @@ -892,51 +691,11 @@ setModeRn new_mode thing_inside rn_down l_down %************************************************************************ \begin{code} -getIfacesRn :: RnMG Ifaces -getIfacesRn rn_down (GDown {rn_ifaces = iface_var}) - = readMutVarSST iface_var - -setIfacesRn :: Ifaces -> RnMG () -setIfacesRn ifaces rn_down (GDown {rn_ifaces = iface_var}) - = writeMutVarSST iface_var ifaces - -getModuleHiMap :: Bool -> RnM s d ModuleHiMap -getModuleHiMap want_hi_boot (RnDown {rn_hi_map = himap, rn_hiboot_map = hibmap}) _ - | want_hi_boot = returnSST hibmap - | otherwise = returnSST himap -\end{code} - -The interface file format is capable of distinguishing -between normal imports/exports of names from other modules -and 'hi-boot' mentions of names, with the flavour in the -being encoded inside a @Module@. - -@setModuleFlavourRn@ fixes up @Module@ values containing -normal flavours, checking to see whether - -\begin{code} -setModuleFlavourRn :: Module -> RnM s d Module -setModuleFlavourRn mod - | bootFlavour hif = returnRn mod - | otherwise = - getModuleHiMap (bootFlavour hif) `thenRn` \ himap -> - let mod_pstr = moduleString mod in - case (lookupFM himap mod_pstr) of - Nothing -> returnRn mod - Just (_,is_in_a_dll) -> - returnRn (setModuleFlavour (mkDynFlavour is_in_a_dll hif) mod) - where - hif = moduleIfaceFlavour mod - -\end{code} +getIfacesRn :: RnM d Ifaces +getIfacesRn (RnDown {rn_ifaces = iface_var}) _ + = readIORef iface_var -%************************************************************************ -%* * -\subsection{HowInScope} -%* * -%************************************************************************ - -\begin{code} -modeToNecessity SourceMode = Compulsory -modeToNecessity (InterfaceMode necessity) = necessity +setIfacesRn :: Ifaces -> RnM d () +setIfacesRn ifaces (RnDown {rn_ifaces = iface_var}) _ + = writeIORef iface_var ifaces \end{code}