%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[RnMonad]{The monad used by the renamer}
\begin{code}
+module RnMonad(
+ module RnMonad,
+ Module,
+ FiniteMap,
+ Bag,
+ Name,
+ RdrNameHsDecl,
+ RdrNameInstDecl,
+ Version,
+ NameSet,
+ OccName,
+ Fixity
+ ) where
+
#include "HsVersions.h"
-module RnMonad (
- RnMonad(..), RnM(..), RnM_Fixes(..), RnDown, SST_R,
- initRn, thenRn, thenRn_, andRn, returnRn,
- mapRn, mapAndUnzipRn,
+import SST
+import GlaExts ( RealWorld, stToIO )
+import List ( intersperse )
+
+import HsSyn
+import RdrHsSyn
+import BasicTypes ( Version, pprModule, IfaceFlavour(..) )
+import SrcLoc ( noSrcLoc )
+import ErrUtils ( addShortErrLocLine, addShortWarnLocLine,
+ pprBagOfErrors, ErrMsg, WarnMsg
+ )
+import Name ( Module, Name, OccName, PrintUnqualified,
+ isLocallyDefinedName,
+ modAndOcc, NamedThing(..)
+ )
+import NameSet
+import CmdLineOpts ( opt_D_show_rn_trace, opt_IgnoreIfacePragmas, opt_WarnHiShadows )
+import PrelInfo ( builtinNames )
+import TysWiredIn ( boolTyCon )
+import SrcLoc ( SrcLoc, mkGeneratedSrcLoc )
+import Unique ( Unique )
+import UniqFM ( UniqFM )
+import FiniteMap ( FiniteMap, emptyFM, bagToFM, lookupFM, addToFM, addListToFM_C, addToFM_C )
+import Bag ( Bag, mapBag, emptyBag, isEmptyBag, snocBag )
+import Maybes ( seqMaybe, mapMaybe )
+import UniqSet
+import UniqSupply
+import Util
+import Outputable
+import DirUtils ( getDirectoryContents )
+import IO ( hPutStrLn, stderr, isDoesNotExistError )
+import Monad ( foldM )
+import Maybe ( fromMaybe )
+import Constants ( interfaceFileFormatVersion )
- addErrRn, addErrIfRn, addWarnRn, addWarnIfRn,
- failButContinueRn, warnAndContinueRn,
- setExtraRn, getExtraRn,
- getModuleRn, pushSrcLocRn, getSrcLocRn,
- getSourceRn, getOccurrenceUpRn,
- getImplicitUpRn, ImplicitEnv(..), emptyImplicitEnv,
- rnGetUnique, rnGetUniques,
+infixr 9 `thenRn`, `thenRn_`
+\end{code}
- newLocalNames,
- lookupValue, lookupValueMaybe, lookupClassOp,
- lookupTyCon, lookupClass, lookupTyConOrClass,
- extendSS2, extendSS,
- TyVarNamesEnv(..), mkTyVarNamesEnv, domTyVarNamesEnv,
- lookupTyVarName, nullTyVarNamesEnv, catTyVarNamesEnvs,
+%************************************************************************
+%* *
+\subsection{Somewhat magical interface to other monads}
+%* *
+%************************************************************************
- fixIO
- ) where
+\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
+
+traceRn :: SDoc -> RnMG ()
+traceRn msg | opt_D_show_rn_trace = putDocRn msg
+ | otherwise = returnRn ()
+
+putDocRn :: SDoc -> RnMG ()
+putDocRn msg = ioToRnMG (printErrs msg) `thenRn_`
+ returnRn ()
+\end{code}
-import Ubiq{-uitous-}
-import SST
+%************************************************************************
+%* *
+\subsection{Data types}
+%* *
+%************************************************************************
-import HsSyn ( FixityDecl )
-import RnHsSyn ( RnName, mkRnName, mkRnUnbound, mkRnImplicit,
- mkRnImplicitTyCon, mkRnImplicitClass,
- isRnLocal, isRnWired, isRnTyCon, isRnClass,
- isRnTyConOrClass, isRnClassOp,
- RenamedFixityDecl(..) )
-import RnUtils ( RnEnv(..), extendLocalRnEnv,
- lookupRnEnv, lookupTcRnEnv,
- unknownNameErr, badClassOpErr, qualNameErr,
- dupNamesErr, shadowedNameWarn )
-
-import Bag ( Bag, emptyBag, isEmptyBag, snocBag )
-import CmdLineOpts ( opt_WarnNameShadowing )
-import ErrUtils ( Error(..), Warning(..) )
-import FiniteMap ( FiniteMap, emptyFM, lookupFM, addToFM )
-import Maybes ( assocMaybe )
-import Name ( Module(..), RdrName(..), isQual,
- Name, mkLocalName, mkImplicitName,
- getOccName
- )
-import PrelInfo ( builtinNameInfo, BuiltinNames(..), BuiltinKeys(..) )
-import Pretty ( Pretty(..), PrettyRep )
-import SrcLoc ( SrcLoc, mkUnknownSrcLoc )
-import UniqFM ( UniqFM, emptyUFM )
-import UniqSet ( UniqSet(..), mkUniqSet, minusUniqSet )
-import UniqSupply ( UniqSupply, getUnique, getUniques, splitUniqSupply )
-import Unique ( Unique )
-import Util
+===================================================
+ MONAD TYPES
+===================================================
-infixr 9 `thenRn`, `thenRn_`
+\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
+
+ -- Common part
+data RnDown s = RnDown
+ SrcLoc
+ (SSTRef s (GenRnNameSupply s))
+ (SSTRef s (Bag WarnMsg, Bag ErrMsg))
+ (SSTRef s ([Occurrence],[Occurrence])) -- Occurrences: compulsory and optional resp
+
+type Occurrence = (Name, SrcLoc) -- The srcloc is the occurrence site
+
+data Necessity = Compulsory | Optional -- We *must* find definitions for
+ -- compulsory occurrences; we *may* find them
+ -- for optional ones.
+
+ -- For getting global names
+data GDown = GDown
+ ModuleHiMap -- for .hi files
+ ModuleHiMap -- for .hi-boot files
+ (SSTRWRef Ifaces)
+
+ -- For renaming source code
+data SDown s = SDown
+ RnEnv -- Global envt
+ NameEnv -- Local name envt (includes global name envt,
+ -- but may shadow it)
+ Module
+ RnSMode
+
+
+data RnSMode = 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.
+ (Name -> PrintUnqualified) -- Tells whether the thing can be printed unqualified
+
+type SearchPath = [(String,String)] -- List of (directory,suffix) pairs to search
+ -- for interface files.
+
+type ModuleHiMap = FiniteMap String String
+ -- mapping from module name to the file path of its corresponding
+ -- interface file.
+
+type FreeVars = NameSet
\end{code}
+===================================================
+ ENVIRONMENTS
+===================================================
+
\begin{code}
-type RnM s r = RnMonad () s r
-type RnM_Fixes s r = RnMonad (UniqFM RenamedFixityDecl) s r
-
-type RnMonad x s r = RnDown x s -> SST s r
-
-data RnDown x s
- = RnDown
- x
- Module -- Module name
- SrcLoc -- Source location
- (RnMode s) -- Source or Iface
- RnEnv -- Renaming environment
- (MutableVar s UniqSupply) -- Unique supply
- (MutableVar s (Bag Warning, -- Warnings and Errors
- Bag Error))
-
-data RnMode s
- = RnSource (MutableVar s (Bag (RnName, RdrName)))
- -- Renaming source; returning occurences
-
- | RnIface BuiltinNames BuiltinKeys
- (MutableVar s ImplicitEnv)
- -- Renaming interface; creating and returning implicit names
- -- ImplicitEnv: one map for Values and one for TyCons/Classes.
-
-type ImplicitEnv = (FiniteMap RdrName RnName, FiniteMap RdrName RnName)
-emptyImplicitEnv :: ImplicitEnv
-emptyImplicitEnv = (emptyFM, emptyFM)
-
--- With a builtin polymorphic type for _runSST the type for
--- initTc should use RnM s r instead of RnM _RealWorld r
-
-initRn :: Bool -- True => Source; False => Iface
- -> Module
- -> RnEnv
- -> UniqSupply
- -> RnM _RealWorld r
- -> (r, Bag Error, Bag Warning)
-
-initRn source mod env us do_rn
- = _runSST (
- newMutVarSST emptyBag `thenSST` \ occ_var ->
- newMutVarSST emptyImplicitEnv `thenSST` \ imp_var ->
- newMutVarSST us `thenSST` \ us_var ->
- newMutVarSST (emptyBag,emptyBag) `thenSST` \ errs_var ->
- let
- mode = if source then
- RnSource occ_var
- else
- case builtinNameInfo of { (wiredin_fm, key_fm, _) ->
- RnIface wiredin_fm key_fm imp_var }
-
- rn_down = RnDown () mod mkUnknownSrcLoc mode env us_var errs_var
- in
- -- do the buisness
- do_rn rn_down `thenSST` \ res ->
+type RnNameSupply = GenRnNameSupply RealWorld
+
+type GenRnNameSupply s
+ = ( UniqSupply
+ , FiniteMap FAST_STRING (SSTRef s Int)
+ , FiniteMap (Module,OccName) Name
+ )
+ -- Ensures that one (m,n) pair gets one unique
+ -- The finite map on FAST_STRINGS is used to give a per-class unique to each
+ -- instance declaration; it's really a separate name supply.
+
+data RnEnv = RnEnv GlobalNameEnv FixityEnv
+emptyRnEnv = RnEnv emptyNameEnv emptyFixityEnv
+
+type GlobalNameEnv = FiniteMap RdrName (Name, HowInScope)
+emptyGlobalNameEnv = emptyFM
+
+data HowInScope -- Used for error messages only
+ = FromLocalDefn SrcLoc
+ | FromImportDecl Module SrcLoc
+
+type NameEnv = FiniteMap RdrName Name
+emptyNameEnv = emptyFM
+
+type FixityEnv = FiniteMap RdrName (Fixity, HowInScope)
+emptyFixityEnv = emptyFM
+ -- It's possible to have a different fixity for B.op than for op:
+ --
+ -- module A( op ) where module B where
+ -- import qualified B( op ) infixr 2 op
+ -- infixl 9 `op` op = ...
+ -- op a b = a `B.op` b
+
+data ExportEnv = ExportEnv Avails Fixities
+type Avails = [AvailInfo]
+type Fixities = [(OccName, 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)
+
+ UniqFM AvailInfo) -- Used to figure out all other export specifiers.
+ -- Maps a Name to the AvailInfo that contains it
+ -- NB: Contain bindings for class ops but
+ -- not constructors (see defn of availEntityNames)
+
+
+data GenAvailInfo name = NotAvailable
+ | 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
+\end{code}
+
+===================================================
+ INTERFACE FILE STUFF
+===================================================
+
+\begin{code}
+type ExportItem = (Module, IfaceFlavour, [RdrAvailInfo])
+type VersionInfo name = [ImportVersion name]
+
+type ImportVersion name = (Module, IfaceFlavour, Version, WhatsImported name)
+data WhatsImported name = Everything
+ | Specifically [LocalVersion name] -- List guaranteed non-empty
+
+ -- ("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 LocalVersion name = (name, Version)
+
+data ParsedIface
+ = ParsedIface
+ Module -- Module name
+ Version -- Module version number
+ [ImportVersion OccName] -- Usages
+ [ExportItem] -- Exports
+ [Module] -- Special instance modules
+ [(OccName,Fixity)] -- Fixities
+ [(Version, RdrNameHsDecl)] -- Local definitions
+ [RdrNameInstDecl] -- Local instance declarations
+
+type InterfaceDetails = (VersionInfo Name, -- Version information for what this module imports
+ ExportEnv, -- What this module exports
+ [Module]) -- Instance modules
+
+type RdrNamePragma = () -- Fudge for now
+-------------------
+
+data Ifaces = Ifaces
+ Module -- Name of this module
+ (FiniteMap Module (IfaceFlavour, -- Exports
+ Version,
+ Avails,
+ [(OccName,Fixity)]))
+ DeclsMap
+
+ 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.
+
+ [(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.
+
+ (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.
+
+ (FiniteMap Name RdrNameTyDecl)
+ -- 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.
+
+ [Module] -- Set of modules with "special" instance declarations
+ -- Excludes this module
+
+
+type DeclsMap = FiniteMap Name (Version, AvailInfo, RdrNameHsDecl)
+type IfaceInst = ((Module, RdrNameInstDecl), -- Instance decl
+ [Name]) -- "Gate" names. Slurp this instance decl when this
+ -- list becomes empty. It's depleted whenever we
+ -- slurp another type or class decl.
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Main monad code}
+%* *
+%************************************************************************
+
+\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
+ let
+ rn_down = RnDown loc names_var errs_var occs_var
+ g_down = GDown himap hibmap iface_var
+
+ -- do the business
+ res <- sstToIO (do_rn rn_down g_down)
-- grab errors and return
- readMutVarSST errs_var `thenSST` \ (warns,errs) ->
- returnSST (res, errs, warns)
+ (warns, errs) <- sstToIO (readMutVarSST errs_var)
+ return (res, errs, warns)
+
+
+initRnMS :: RnEnv -> Module -> RnSMode -> RnMS RealWorld r -> RnMG r
+initRnMS rn_env@(RnEnv name_env _) mod_name mode m rn_down g_down
+ = let
+ s_down = SDown rn_env emptyNameEnv mod_name mode
+ in
+ m rn_down s_down
+
+
+emptyIfaces :: Module -> Ifaces
+emptyIfaces mod = Ifaces mod emptyFM emptyFM emptyNameSet [] (emptyBag, emptyNameSet) emptyFM []
+
+builtins :: FiniteMap (Module,OccName) Name
+builtins = bagToFM (mapBag (\ name -> (modAndOcc 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}
+
+\begin{code}
+mkModuleHiMaps :: SearchPath -> IO (ModuleHiMap, ModuleHiMap)
+mkModuleHiMaps dirs = foldM (getAllFilesMatching dirs) (env,env) dirs
+ where
+ env = emptyFM
+
+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
+ return (foldl addModules 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 his@(hi_env, hib_env) nm = fromMaybe his $
+ map (\ (mod_nm,v) -> (addToFM_C addNewOne hi_env mod_nm v, hib_env))
+ (go xiffus rev_nm) `seqMaybe`
+
+ map (\ (mod_nm,v) -> (hi_env, addToFM_C overrideNew hib_env mod_nm v))
+ (go hi_boot_version_xiffus rev_nm) `seqMaybe`
+
+ map (\ (mod_nm,v) -> (hi_env, addToFM_C addNewOne hib_env mod_nm v))
+ (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 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.
+
+\end{code}
+
+
+@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
+once you must either split it, or install a fresh unique supply.
+
+\begin{code}
+renameSourceCode :: Module
+ -> RnNameSupply
+ -> RnMS RealWorld 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 mod_name name_supply m
+ = runSST (
+ newMutVarSST name_supply `thenSST` \ names_var ->
+ newMutVarSST (emptyBag,emptyBag) `thenSST` \ errs_var ->
+ newMutVarSST ([],[]) `thenSST` \ occs_var ->
+ let
+ rn_down = RnDown mkGeneratedSrcLoc names_var errs_var occs_var
+ s_down = SDown emptyRnEnv emptyNameEnv mod_name (InterfaceMode Compulsory (\_ -> False))
+ in
+ m rn_down s_down `thenSST` \ result ->
+
+ readMutVarSST errs_var `thenSST` \ (warns,errs) ->
+
+ (if not (isEmptyBag errs) then
+ pprTrace "Urk! renameSourceCode found errors" (display errs)
+#ifdef DEBUG
+ else if not (isEmptyBag warns) then
+ pprTrace "Urk! renameSourceCode found warnings" (display warns)
+#endif
+ else
+ id) $
+
+ returnSST result
)
+ where
+ display errs = pprBagOfErrors errs
{-# INLINE thenRn #-}
{-# INLINE thenRn_ #-}
{-# INLINE returnRn #-}
{-# INLINE andRn #-}
-returnRn :: a -> RnMonad x s a
-thenRn :: RnMonad x s a -> (a -> RnMonad x s b) -> RnMonad x s b
-thenRn_ :: RnMonad x s a -> RnMonad x s b -> RnMonad x s b
-andRn :: (a -> a -> a) -> RnMonad x s a -> RnMonad x s a -> RnMonad x s a
-mapRn :: (a -> RnMonad x s b) -> [a] -> RnMonad x s [b]
-mapAndUnzipRn :: (a -> RnMonad x s (b,c)) -> [a] -> RnMonad x s ([b],[c])
-
-returnRn v down = returnSST v
-thenRn m k down = m down `thenSST` \ r -> k r down
-thenRn_ m k down = m down `thenSST_` k down
-
-andRn combiner m1 m2 down
- = m1 down `thenSST` \ res1 ->
- m2 down `thenSST` \ res2 ->
+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 b) -> b -> Maybe 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)
+andRn combiner m1 m2 gdown ldown
+ = m1 gdown ldown `thenSST` \ res1 ->
+ m2 gdown ldown `thenSST` \ res2 ->
returnSST (combiner res1 res2)
+sequenceRn [] = returnRn []
+sequenceRn (m:ms) = m `thenRn` \ r ->
+ sequenceRn ms `thenRn` \ rs ->
+ returnRn (r:rs)
+
mapRn f [] = returnRn []
mapRn f (x:xs)
= f x `thenRn` \ r ->
mapRn f xs `thenRn` \ rs ->
returnRn (r:rs)
+foldlRn k z [] = returnRn z
+foldlRn k z (x:xs) = k z x `thenRn` \ z' ->
+ foldlRn k z' xs
+
mapAndUnzipRn f [] = returnRn ([],[])
mapAndUnzipRn f (x:xs)
= f x `thenRn` \ (r1, r2) ->
mapAndUnzipRn f xs `thenRn` \ (rs1, rs2) ->
returnRn (r1:rs1, r2:rs2)
-\end{code}
-For errors and warnings ...
-\begin{code}
-failButContinueRn :: a -> Error -> RnMonad x s a
-failButContinueRn res err (RnDown _ _ _ _ _ _ errs_var)
- = readMutVarSST errs_var `thenSST` \ (warns,errs) ->
- writeMutVarSST errs_var (warns, errs `snocBag` err) `thenSST_`
- returnSST res
+mapAndUnzip3Rn f [] = returnRn ([],[],[])
+mapAndUnzip3Rn f (x:xs)
+ = f x `thenRn` \ (r1, r2, r3) ->
+ mapAndUnzip3Rn f xs `thenRn` \ (rs1, rs2, rs3) ->
+ returnRn (r1:rs1, r2:rs2, r3:rs3)
-warnAndContinueRn :: a -> Warning -> RnMonad x s a
-warnAndContinueRn res warn (RnDown _ _ _ _ _ _ errs_var)
- = readMutVarSST errs_var `thenSST` \ (warns,errs) ->
- writeMutVarSST errs_var (warns `snocBag` warn, errs) `thenSST_`
- returnSST res
+mapMaybeRn f def Nothing = returnRn def
+mapMaybeRn f def (Just v) = f v
+\end{code}
-addErrRn :: Error -> RnMonad x s ()
-addErrRn err = failButContinueRn () err
-addErrIfRn :: Bool -> Error -> RnMonad x s ()
-addErrIfRn True err = addErrRn err
-addErrIfRn False err = returnRn ()
-addWarnRn :: Warning -> RnMonad x s ()
-addWarnRn warn = warnAndContinueRn () warn
+%************************************************************************
+%* *
+\subsection{Boring plumbing for common part}
+%* *
+%************************************************************************
-addWarnIfRn :: Bool -> Warning -> RnMonad x s ()
-addWarnIfRn True warn = addWarnRn warn
-addWarnIfRn False warn = returnRn ()
-\end{code}
+================ Errors and warnings =====================
\begin{code}
-setExtraRn :: x -> RnMonad x s r -> RnMonad y s r
-setExtraRn x m (RnDown _ mod locn mode env us errs)
- = m (RnDown x mod locn mode env us errs)
-
-getExtraRn :: RnMonad x s x
-getExtraRn (RnDown x _ _ _ _ _ _)
- = returnSST x
-
-getModuleRn :: RnMonad x s Module
-getModuleRn (RnDown _ mod _ _ _ _ _)
- = returnSST mod
-
-pushSrcLocRn :: SrcLoc -> RnMonad x s a -> RnMonad x s a
-pushSrcLocRn locn m (RnDown x mod _ mode env us errs)
- = m (RnDown x mod locn mode env us errs)
-
-getSrcLocRn :: RnMonad x s SrcLoc
-getSrcLocRn (RnDown _ _ locn _ _ _ _)
- = returnSST locn
-
-getSourceRn :: RnMonad x s Bool
-getSourceRn (RnDown _ _ _ (RnSource _) _ _ _) = returnSST True
-getSourceRn (RnDown _ _ _ (RnIface _ _ _) _ _ _) = returnSST False
-
-getOccurrenceUpRn :: RnMonad x s (Bag (RnName, RdrName))
-getOccurrenceUpRn (RnDown _ _ _ (RnSource occ_var) _ _ _)
- = readMutVarSST occ_var
-getOccurrenceUpRn (RnDown _ _ _ (RnIface _ _ _) _ _ _)
- = panic "getOccurrenceUpRn:RnIface"
-
-getImplicitUpRn :: RnMonad x s ImplicitEnv
-getImplicitUpRn (RnDown _ _ _ (RnIface _ _ imp_var) _ _ _)
- = readMutVarSST imp_var
-getImplicitUpRn (RnDown _ _ _(RnSource _) _ _ _)
- = panic "getImplicitUpRn:RnIface"
-\end{code}
-
-\begin{code}
-rnGetUnique :: RnMonad x s Unique
-rnGetUnique (RnDown _ _ _ _ _ us_var _)
- = get_unique us_var
-
-rnGetUniques :: Int -> RnMonad x s [Unique]
-rnGetUniques n (RnDown _ _ _ _ _ us_var _)
- = get_uniques n us_var
+failWithRn :: a -> ErrMsg -> RnM s d a
+failWithRn res msg (RnDown loc names_var errs_var occs_var) l_down
+ = readMutVarSST errs_var `thenSST` \ (warns,errs) ->
+ writeMutVarSST errs_var (warns, errs `snocBag` err) `thenSST_`
+ returnSST res
+ where
+ err = addShortErrLocLine loc msg
+warnWithRn :: a -> WarnMsg -> RnM s d a
+warnWithRn res msg (RnDown loc names_var errs_var occs_var) l_down
+ = readMutVarSST errs_var `thenSST` \ (warns,errs) ->
+ writeMutVarSST errs_var (warns `snocBag` warn, errs) `thenSST_`
+ returnSST res
+ where
+ warn = addShortWarnLocLine loc msg
-get_unique us_var
- = readMutVarSST us_var `thenSST` \ uniq_supply ->
- let
- (new_uniq_supply, uniq_s) = splitUniqSupply uniq_supply
- uniq = getUnique uniq_s
- in
- writeMutVarSST us_var new_uniq_supply `thenSST_`
- returnSST uniq
+addErrRn :: ErrMsg -> RnM s d ()
+addErrRn err = failWithRn () err
-get_uniques n us_var
- = readMutVarSST us_var `thenSST` \ uniq_supply ->
- let
- (new_uniq_supply, uniq_s) = splitUniqSupply uniq_supply
- uniqs = getUniques n uniq_s
- in
- writeMutVarSST us_var new_uniq_supply `thenSST_`
- returnSST uniqs
+checkRn :: Bool -> ErrMsg -> RnM s d () -- Check that a condition is true
+checkRn False err = addErrRn err
+checkRn True err = returnRn ()
-snoc_bag_var add bag_var
- = readMutVarSST bag_var `thenSST` \ bag ->
- writeMutVarSST bag_var (bag `snocBag` add)
+addWarnRn :: WarnMsg -> RnM s d ()
+addWarnRn warn = warnWithRn () warn
+checkErrsRn :: RnM s d Bool -- True <=> no errors so far
+checkErrsRn (RnDown loc names_var errs_var occs_var) l_down
+ = readMutVarSST errs_var `thenSST` \ (warns,errs) ->
+ returnSST (isEmptyBag errs)
\end{code}
-*********************************************************
-* *
-\subsection{Making new names}
-* *
-*********************************************************
-@newLocalNames@ takes a bunch of RdrNames, which are defined together
-in a group (eg a pattern or set of bindings), checks they are
-unqualified and distinct, and creates new Names for them.
+================ Source location =====================
\begin{code}
-newLocalNames :: String -- Documentation string
- -> [(RdrName, SrcLoc)]
- -> RnMonad x s [RnName]
-
-newLocalNames str names_w_loc
- = mapRn (addErrRn . qualNameErr str) quals `thenRn_`
- mapRn (addErrRn . dupNamesErr str) dups `thenRn_`
- mkLocalNames these
- where
- quals = filter (isQual.fst) names_w_loc
- (these, dups) = removeDups cmp_fst names_w_loc
- cmp_fst (a,_) (b,_) = cmp a b
-\end{code}
+pushSrcLocRn :: SrcLoc -> RnM s d a -> RnM s d a
+pushSrcLocRn loc' m (RnDown loc names_var errs_var occs_var) l_down
+ = m (RnDown loc' names_var errs_var occs_var) l_down
-\begin{code}
-mkLocalNames :: [(RdrName, SrcLoc)] -> RnMonad x s [RnName]
-mkLocalNames names_w_locs
- = rnGetUniques (length names_w_locs) `thenRn` \ uniqs ->
- returnRn (zipWithEqual new_local uniqs names_w_locs)
- where
- new_local uniq (Unqual str, srcloc)
- = mkRnName (mkLocalName uniq str srcloc)
+getSrcLocRn :: RnM s d SrcLoc
+getSrcLocRn (RnDown loc names_var errs_var occs_var) l_down
+ = returnSST loc
\end{code}
-
-*********************************************************
-* *
-\subsection{Looking up values}
-* *
-*********************************************************
-
-Action to look up a value depends on the RnMode.
-\begin{description}
-\item[RnSource:]
-Lookup value in RnEnv, recording occurrence for non-local values found.
-If not found report error and return Unbound name.
-\item[RnIface:]
-Lookup value in RnEnv. If not found lookup in implicit name env.
-If not found create new implicit name, adding it to the implicit env.
-\end{description}
+================ Name supply =====================
\begin{code}
-lookupValue :: RdrName -> RnMonad x s RnName
-lookupClassOp :: RnName -> RdrName -> RnMonad x s RnName
+getNameSupplyRn :: RnM s d (GenRnNameSupply s)
+getNameSupplyRn (RnDown loc names_var errs_var occs_var) l_down
+ = readMutVarSST names_var
+
+setNameSupplyRn :: GenRnNameSupply s -> RnM s d ()
+setNameSupplyRn names' (RnDown loc names_var errs_var occs_var) l_down
+ = writeMutVarSST names_var names'
+
+-- The "instance-decl unique supply", inst, is really a map from class names
+-- to unique supplies. Having per-class unique numbers for instance decls helps
+-- the recompilation checker.
+newInstUniq :: FAST_STRING -> RnM s d Int
+newInstUniq cname (RnDown loc names_var errs_var occs_var) l_down
+ = readMutVarSST names_var `thenSST` \ (us, mapInst, cache) ->
+ case lookupFM mapInst cname of
+ Just class_us ->
+ readMutVarSST class_us `thenSST` \ v ->
+ writeMutVarSST class_us (v+1) `thenSST_`
+ returnSST v
+ Nothing -> -- first time caller gets to add a unique supply
+ -- to the finite map for that class.
+ newMutVarSST 1 `thenSST` \ class_us ->
+ let
+ mapInst' = addToFM mapInst cname class_us
+ in
+ writeMutVarSST names_var (us, mapInst', cache) `thenSST_`
+ returnSST 0
-lookupValue rdr
- = lookup_val rdr (\ rn -> True) (unknownNameErr "value")
+\end{code}
-lookupClassOp cls rdr
- = lookup_val rdr (\ rn -> True){-WAS:(isRnClassOp cls)-} (badClassOpErr cls)
+================ 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
-lookup_val rdr check do_err down@(RnDown _ _ locn (RnSource occ_var) env _ _)
- = case lookupRnEnv env rdr of
- Just name | check name -> succ name
- | otherwise -> fail
- Nothing -> fail
+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.
- where
- succ name = if isRnLocal name || isRnWired name then
- returnSST name
- else
- snoc_bag_var (name,rdr) occ_var `thenSST_`
- returnSST name
- fail = failButContinueRn (mkRnUnbound rdr) (do_err rdr locn) down
-
-lookup_val rdr check do_err down@(RnDown _ _ locn (RnIface b_names b_key imp_var) env us_var _)
- = case lookupRnEnv env rdr of
- Just name | check name -> returnSST name
- | otherwise -> failButContinueRn (mkRnUnbound rdr) (do_err rdr locn) down
- Nothing -> lookup_nonexisting_val b_names b_key imp_var us_var rdr
-
-lookup_nonexisting_val (b_names,_) b_key imp_var us_var rdr
- = case rdr of
- Qual _ _ -> -- builtin things *don't* have Qual names
- lookup_or_create_implicit_val b_key imp_var us_var rdr
-
- Unqual n -> case (lookupFM b_names n) of
- Nothing -> lookup_or_create_implicit_val b_key imp_var us_var rdr
- Just xx -> returnSST xx
-
-lookup_or_create_implicit_val b_key imp_var us_var rdr
- = readMutVarSST imp_var `thenSST` \ (implicit_val_fm, implicit_tc_fm) ->
- case lookupFM implicit_val_fm rdr of
- Just implicit -> returnSST implicit
- Nothing ->
- (case rdr of
- Qual _ _ -> get_unique us_var
- Unqual n -> case (lookupFM b_key n) of
- Just (u,_) -> returnSST u
- _ -> get_unique us_var
- ) `thenSST` \ uniq ->
- let
- implicit = mkRnImplicit (mkImplicitName uniq rdr)
- new_val_fm = addToFM implicit_val_fm rdr implicit
- in
- writeMutVarSST imp_var (new_val_fm, implicit_tc_fm) `thenSST_`
- returnSST implicit
-
-
-lookupValueMaybe :: RdrName -> RnMonad x s (Maybe RnName)
-lookupValueMaybe rdr down@(RnDown _ _ _ (RnSource _) env _ _)
- = returnSST (lookupRnEnv env rdr)
-\end{code}
+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.
-\begin{code}
-lookupTyCon :: RdrName -> RnMonad x s RnName
-lookupClass :: RdrName -> RnMonad x s RnName
+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.
-lookupTyCon rdr
- = lookup_tc rdr isRnTyCon mkRnImplicitTyCon "type constructor"
+\begin{code}
+addOccurrenceName :: Name -> RnMS s Name -- Same name returned as passed
+addOccurrenceName name (RnDown loc names_var errs_var occs_var)
+ (SDown rn_env local_env mod_name 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
-lookupClass rdr
- = lookup_tc rdr isRnClass mkRnImplicitClass "class"
-lookupTyConOrClass rdr
- = lookup_tc rdr isRnTyConOrClass
- (panic "lookupTC:mk_implicit") "class or type constructor"
+addOccurrenceNames :: [Name] -> RnMS s ()
+addOccurrenceNames names (RnDown loc names_var errs_var occs_var)
+ (SDown rn_env local_env mod_name mode)
+ | not_necessary necessity
+ = returnSST ()
-lookup_tc rdr check mk_implicit err_str down@(RnDown _ _ locn (RnSource occ_var) env _ _)
- = case lookupTcRnEnv env rdr of
- Just name | check name -> succ name
- | otherwise -> fail
- Nothing -> fail
- where
- succ name = snoc_bag_var (name,rdr) occ_var `thenSST_`
- returnSST name
- fail = failButContinueRn (mkRnUnbound rdr) (unknownNameErr err_str rdr locn) down
-
-lookup_tc rdr check mk_implicit err_str down@(RnDown _ _ locn (RnIface b_names b_key imp_var) env us_var _)
- = case lookupTcRnEnv env rdr of
- Just name | check name -> returnSST name
- | otherwise -> fail
- Nothing -> lookup_nonexisting_tc check mk_implicit fail b_names b_key imp_var us_var rdr
+ | 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
- fail = failButContinueRn (mkRnUnbound rdr) (unknownNameErr err_str rdr locn) down
-
-lookup_nonexisting_tc check mk_implicit fail (_,b_names) b_key imp_var us_var rdr
- = case rdr of
- Qual _ _ -> -- builtin things *don't* have Qual names
- lookup_or_create_implicit_tc check mk_implicit fail b_key imp_var us_var rdr
-
- Unqual n -> case (lookupFM b_names n) of
- Nothing -> lookup_or_create_implicit_tc check mk_implicit fail b_key imp_var us_var rdr
- Just xx -> returnSST xx
-
-lookup_or_create_implicit_tc check mk_implicit fail b_key imp_var us_var rdr
- = readMutVarSST imp_var `thenSST` \ (implicit_val_fm, implicit_tc_fm) ->
- case lookupFM implicit_tc_fm rdr of
- Just implicit | check implicit -> returnSST implicit
- | otherwise -> fail
- Nothing ->
- (case rdr of
- Qual _ _ -> get_unique us_var
- Unqual n -> case (lookupFM b_key n) of
- Just (u,_) -> returnSST u
- _ -> get_unique us_var
- ) `thenSST` \ uniq ->
- let
- implicit = mk_implicit (mkImplicitName uniq rdr)
- new_tc_fm = addToFM implicit_tc_fm rdr implicit
- in
- writeMutVarSST imp_var (implicit_val_fm, new_tc_fm) `thenSST_`
- returnSST implicit
+ 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 :: RnSMode -> RnM s d (Maybe Occurrence)
+popOccurrenceName mode (RnDown loc names_var errs_var 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))
+ -> ASSERT( null comps )
+ writeMutVarSST occs_var (comps, opts) `thenSST_`
+ returnSST (Just opt)
+
+ -- No suitable occurrence
+ other -> returnSST Nothing
+
+-- findOccurrencesRn does the enclosed thing with a *fresh* occurrences
+-- variable, and returns 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.
+
+findOccurrencesRn :: RnM s d a -> RnM s d [Name]
+findOccurrencesRn enclosed_thing (RnDown loc names_var errs_var occs_var) l_down
+ = newMutVarSST ([],[]) `thenSST` \ new_occs_var ->
+ enclosed_thing (RnDown loc names_var errs_var new_occs_var) l_down `thenSST_`
+ readMutVarSST new_occs_var `thenSST` \ (occs,_) ->
+ returnSST (map fst occs)
\end{code}
-@extendSS@ extends the scope; @extendSS2@ also removes the newly bound
-free vars from the result.
+%************************************************************************
+%* *
+\subsection{Plumbing for rename-source part}
+%* *
+%************************************************************************
-\begin{code}
-extendSS :: [RnName] -- Newly bound names
- -> RnMonad x s a
- -> RnMonad x s a
+================ RnEnv =====================
-extendSS binders m down@(RnDown x mod locn mode env us errs)
- = (mapRn (addErrRn . shadowedNameWarn locn) dups `thenRn_`
- m) (RnDown x mod locn mode new_env us errs)
- where
- (new_env,dups) = extendLocalRnEnv opt_WarnNameShadowing env binders
+\begin{code}
+-- Look in global env only
+lookupGlobalNameRn :: RdrName -> RnMS s (Maybe Name)
+lookupGlobalNameRn rdr_name rn_down (SDown (RnEnv global_env fixity_env) local_env mod_name mode)
+ = case lookupFM global_env rdr_name of
+ Just (name, _) -> returnSST (Just name)
+ Nothing -> returnSST Nothing
+
+-- Look in both local and global env
+lookupNameRn :: RdrName -> RnMS s (Maybe Name)
+lookupNameRn rdr_name rn_down (SDown (RnEnv global_env fixity_env) local_env mod_name mode)
+ = case lookupFM local_env rdr_name of
+ Just name -> returnSST (Just name)
+ Nothing -> case lookupFM global_env rdr_name of
+ Just (name, _) -> returnSST (Just name)
+ Nothing -> returnSST Nothing
+
+getNameEnvs :: RnMS s (GlobalNameEnv, NameEnv)
+getNameEnvs rn_down (SDown (RnEnv global_env fixity_env) local_env mod_name mode)
+ = returnSST (global_env, local_env)
+
+getLocalNameEnv :: RnMS s NameEnv
+getLocalNameEnv rn_down (SDown rn_env local_env mod_name mode)
+ = returnSST local_env
+
+setLocalNameEnv :: NameEnv -> RnMS s a -> RnMS s a
+setLocalNameEnv local_env' m rn_down (SDown rn_env local_env mod_name mode)
+ = m rn_down (SDown rn_env local_env' mod_name mode)
+
+getFixityEnv :: RnMS s FixityEnv
+getFixityEnv rn_down (SDown (RnEnv name_env fixity_env) local_env mod_name mode)
+ = returnSST fixity_env
+\end{code}
-extendSS2 :: [RnName] -- Newly bound names
- -> RnMonad x s (a, UniqSet RnName)
- -> RnMonad x s (a, UniqSet RnName)
+================ Module and Mode =====================
-extendSS2 binders m
- = extendSS binders m `thenRn` \ (r, fvs) ->
- returnRn (r, fvs `minusUniqSet` (mkUniqSet binders))
+\begin{code}
+getModuleRn :: RnMS s Module
+getModuleRn rn_down (SDown rn_env local_env mod_name mode)
+ = returnSST mod_name
\end{code}
-The free var set returned by @(extendSS binders m)@ is that returned
-by @m@, {\em minus} binders.
+\begin{code}
+getModeRn :: RnMS s RnSMode
+getModeRn rn_down (SDown rn_env local_env mod_name mode)
+ = returnSST mode
+
+setModeRn :: RnSMode -> RnMS s a -> RnMS s a
+setModeRn new_mode thing_inside rn_down (SDown rn_env local_env mod_name mode)
+ = thing_inside rn_down (SDown rn_env local_env mod_name new_mode)
+\end{code}
-*********************************************************
-* *
-\subsection{TyVarNamesEnv}
-* *
-*********************************************************
+%************************************************************************
+%* *
+\subsection{Plumbing for rename-globals part}
+%* *
+%************************************************************************
\begin{code}
-type TyVarNamesEnv = [(RdrName, RnName)]
+getIfacesRn :: RnMG Ifaces
+getIfacesRn rn_down (GDown himap hibmap iface_var)
+ = readMutVarSST iface_var
-nullTyVarNamesEnv :: TyVarNamesEnv
-nullTyVarNamesEnv = []
+setIfacesRn :: Ifaces -> RnMG ()
+setIfacesRn ifaces rn_down (GDown himap hibmap iface_var)
+ = writeMutVarSST iface_var ifaces
-catTyVarNamesEnvs :: TyVarNamesEnv -> TyVarNamesEnv -> TyVarNamesEnv
-catTyVarNamesEnvs e1 e2 = e1 ++ e2
+getModuleHiMap :: IfaceFlavour -> RnMG ModuleHiMap
+getModuleHiMap as_source rn_down (GDown himap hibmap iface_var)
+ = case as_source of
+ HiBootFile -> returnSST hibmap
+ _ -> returnSST himap
-domTyVarNamesEnv :: TyVarNamesEnv -> [RdrName]
-domTyVarNamesEnv env = map fst env
\end{code}
-@mkTyVarNamesEnv@ checks for duplicates, and complains if so.
-
-\begin{code}
-mkTyVarNamesEnv
- :: SrcLoc
- -> [RdrName] -- The type variables
- -> RnMonad x s (TyVarNamesEnv,[RnName]) -- Environment and renamed tyvars
-
-mkTyVarNamesEnv src_loc tyvars
- = newLocalNames "type variable"
- (tyvars `zip` repeat src_loc) `thenRn` \ rn_tyvars ->
-
- -- rn_tyvars may not be in the same order as tyvars, so we need some
- -- jiggery pokery to build the right tyvar env, and return the
- -- renamed tyvars in the original order.
- let tv_occ_name_pairs = map tv_occ_name_pair rn_tyvars
- tv_env = map (lookup_occ_name tv_occ_name_pairs) tyvars
- rn_tyvars_in_orig_order = map snd tv_env
- in
- returnRn (tv_env, rn_tyvars_in_orig_order)
- where
- tv_occ_name_pair :: RnName -> (RdrName, RnName)
- tv_occ_name_pair rn_name = (getOccName rn_name, rn_name)
-
- lookup_occ_name :: [(RdrName, RnName)] -> RdrName -> (RdrName, RnName)
- lookup_occ_name pairs tyvar_occ
- = (tyvar_occ, assoc "mkTyVarNamesEnv" pairs tyvar_occ)
-\end{code}
+%************************************************************************
+%* *
+\subsection{HowInScope}
+%* *
+%************************************************************************
\begin{code}
-lookupTyVarName :: TyVarNamesEnv -> RdrName -> RnMonad x s RnName
-lookupTyVarName env occ
- = case (assocMaybe env occ) of
- Just name -> returnRn name
- Nothing -> getSrcLocRn `thenRn` \ loc ->
- failButContinueRn (mkRnUnbound occ)
- (unknownNameErr "type variable" occ loc)
+instance Outputable HowInScope where
+ ppr (FromLocalDefn loc) = ptext SLIT("Defined at") <+> ppr loc
+ ppr (FromImportDecl mod loc) = ptext SLIT("Imported from") <+> quotes (pprModule mod) <+>
+ ptext SLIT("at") <+> ppr loc
\end{code}
\begin{code}
-fixIO :: (a -> IO a) -> IO a
-fixIO k s = let
- result = k loop s
- (Right loop, _) = result
- in
- result
+modeToNecessity SourceMode = Compulsory
+modeToNecessity (InterfaceMode necessity _) = necessity
\end{code}
projects / ghc-hetmet.git / blobdiff