#include "HsVersions.h"
+import {-# SOURCE #-} RnHiFiles
+
import HsSyn
import RdrHsSyn ( RdrNameIE )
import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual, isOrig,
- mkRdrUnqual, mkRdrQual, qualifyRdrName, lookupRdrEnv, foldRdrEnv
+ mkRdrUnqual, mkRdrQual, lookupRdrEnv, foldRdrEnv, rdrEnvToList,
+ unqualifyRdrName
)
import HsTypes ( hsTyVarName, replaceTyVarName )
import HscTypes ( Provenance(..), pprNameProvenance, hasBetterProv,
- ImportReason(..), GlobalRdrEnv, AvailEnv,
- AvailInfo, Avails, GenAvailInfo(..), NameSupply(..) )
+ ImportReason(..), GlobalRdrEnv, GlobalRdrElt(..), AvailEnv,
+ AvailInfo, Avails, GenAvailInfo(..), NameSupply(..),
+ ModIface(..),
+ Deprecations(..), lookupDeprec,
+ extendLocalRdrEnv
+ )
import RnMonad
-import Name ( Name, NamedThing(..),
- getSrcLoc,
+import Name ( Name,
+ getSrcLoc, nameIsLocalOrFrom,
mkLocalName, mkGlobalName,
mkIPName, nameOccName, nameModule_maybe,
setNameModuleAndLoc
)
-import Name ( extendNameEnv_C, plusNameEnv_C, nameEnvElts )
+import NameEnv
import NameSet
import OccName ( OccName, occNameUserString, occNameFlavour )
-import Module ( ModuleName, moduleName, mkVanillaModule, mkSysModuleNameFS, moduleNameFS )
+import Module ( ModuleName, moduleName, mkVanillaModule,
+ mkSysModuleNameFS, moduleNameFS, WhereFrom(..) )
+import PrelNames ( mkUnboundName, syntaxList, SyntaxMap, vanillaSyntaxMap,
+ derivingOccurrences,
+ mAIN_Name, pREL_MAIN_Name,
+ ioTyConName, intTyConName,
+ boolTyConName, funTyConName,
+ unpackCStringName, unpackCStringFoldrName, unpackCStringUtf8Name,
+ eqStringName, printName,
+ bindIOName, returnIOName, failIOName
+ )
+import TysWiredIn ( unitTyCon ) -- A little odd
import FiniteMap
import UniqSupply
import SrcLoc ( SrcLoc, noSrcLoc )
import ListSetOps ( removeDups, equivClasses )
import Util ( sortLt )
import List ( nub )
-import PrelNames ( mkUnboundName )
+import UniqFM ( lookupWithDefaultUFM )
+import Maybes ( orElse )
import CmdLineOpts
import FastString ( FastString )
\end{code}
newTopBinder mod rdr_name loc
= -- First check the cache
- -- traceRn (text "newTopBinder" <+> ppr mod <+> ppr loc) `thenRn_`
-- There should never be a qualified name in a binding position (except in instance decls)
-- The parser doesn't check this because the same parser parses instance decls
new_cache = addToFM cache key new_name
in
setNameSupplyRn (name_supply {nsNames = new_cache}) `thenRn_`
- traceRn (text "newTopBinder: overwrite" <+> ppr new_name) `thenRn_`
+-- traceRn (text "newTopBinder: overwrite" <+> ppr new_name) `thenRn_`
returnRn new_name
-- Miss in the cache!
new_cache = addToFM cache key new_name
in
setNameSupplyRn (name_supply {nsUniqs = us', nsNames = new_cache}) `thenRn_`
- traceRn (text "newTopBinder: new" <+> ppr new_name) `thenRn_`
+-- traceRn (text "newTopBinder: new" <+> ppr new_name) `thenRn_`
returnRn new_name
Nothing -> lookupTopBndrRn rdr_name
lookupTopBndrRn rdr_name
- = getModeRn `thenRn` \ mode ->
- case mode of
- InterfaceMode -> lookupIfaceName rdr_name
+-- Look up a top-level local binder. We may be looking up an unqualified 'f',
+-- and there may be several imported 'f's too, which must not confuse us.
+-- So we have to filter out the non-local ones.
+-- A separate function (importsFromLocalDecls) reports duplicate top level
+-- decls, so here it's safe just to choose an arbitrary one.
+
+ | isOrig rdr_name
+ -- This is here just to catch the PrelBase defn of (say) [] and similar
+ -- The parser reads the special syntax and returns an Orig RdrName
+ -- But the global_env contains only Qual RdrNames, so we won't
+ -- find it there; instead just get the name via the Orig route
+ = lookupOrigName rdr_name
- SourceMode -> -- Source mode, so look up a *qualified* version
- -- of the name, so that we get the right one even
- -- if there are many with the same occ name
- -- There must *be* a binding
- getModuleRn `thenRn` \ mod ->
- getGlobalNameEnv `thenRn` \ global_env ->
- lookupSrcName global_env (qualifyRdrName (moduleName mod) rdr_name)
+ | otherwise
+ = getModeRn `thenRn` \ mode ->
+ if isInterfaceMode mode
+ then lookupIfaceName rdr_name
+ else
+ getModuleRn `thenRn` \ mod ->
+ getGlobalNameEnv `thenRn` \ global_env ->
+ case lookup_local mod global_env rdr_name of
+ Just name -> returnRn name
+ Nothing -> failWithRn (mkUnboundName rdr_name)
+ (unknownNameErr rdr_name)
+ where
+ lookup_local mod global_env rdr_name
+ = case lookupRdrEnv global_env rdr_name of
+ Nothing -> Nothing
+ Just gres -> case [n | GRE n _ _ <- gres, nameIsLocalOrFrom mod n] of
+ [] -> Nothing
+ (n:ns) -> Just n
+
-- lookupSigOccRn is used for type signatures and pragmas
-- Is this valid?
lookupGlobalOccRn rdr_name
= getModeRn `thenRn` \ mode ->
- case mode of
- SourceMode -> getGlobalNameEnv `thenRn` \ global_env ->
- lookupSrcName global_env rdr_name
+ if (isInterfaceMode mode)
+ then lookupIfaceName rdr_name
+ else
- InterfaceMode -> lookupIfaceName rdr_name
+ getGlobalNameEnv `thenRn` \ global_env ->
+ case mode of
+ SourceMode -> lookupSrcName global_env rdr_name
+
+ CmdLineMode
+ | not (isQual rdr_name) ->
+ lookupSrcName global_env rdr_name
+
+ -- We allow qualified names on the command line to refer to
+ -- *any* name exported by any module in scope, just as if
+ -- there was an "import qualified M" declaration for every
+ -- module.
+ --
+ -- First look up the name in the normal environment. If
+ -- it isn't there, we manufacture a new occurrence of an
+ -- original name.
+ | otherwise ->
+ case lookupRdrEnv global_env rdr_name of
+ Just _ -> lookupSrcName global_env rdr_name
+ Nothing -> lookupQualifiedName rdr_name
+
+-- a qualified name on the command line can refer to any module at all: we
+-- try to load the interface if we don't already have it.
+lookupQualifiedName :: RdrName -> RnM d Name
+lookupQualifiedName rdr_name
+ = let
+ mod = rdrNameModule rdr_name
+ occ = rdrNameOcc rdr_name
+ in
+ loadInterface (ppr rdr_name) mod ImportByUser `thenRn` \ iface ->
+ case [ name | (_,avails) <- mi_exports iface,
+ avail <- avails,
+ name <- availNames avail,
+ nameOccName name == occ ] of
+ (n:ns) -> ASSERT (null ns) returnRn n
+ _ -> failWithRn (mkUnboundName rdr_name) (unknownNameErr rdr_name)
lookupSrcName :: GlobalRdrEnv -> RdrName -> RnM d Name
-- NB: passed GlobalEnv explicitly, not necessarily in RnMS monad
| otherwise
= case lookupRdrEnv global_env rdr_name of
- Just [(name,_)] -> returnRn name
- Just stuff@((name,_):_) -> addNameClashErrRn rdr_name stuff `thenRn_`
- returnRn name
- Nothing -> failWithRn (mkUnboundName rdr_name)
- (unknownNameErr rdr_name)
+ Just [GRE name _ Nothing] -> returnRn name
+ Just [GRE name _ (Just deprec)] -> warnDeprec name deprec `thenRn_`
+ returnRn name
+ Just stuff@(GRE name _ _ : _) -> addNameClashErrRn rdr_name stuff `thenRn_`
+ returnRn name
+ Nothing -> failWithRn (mkUnboundName rdr_name)
+ (unknownNameErr rdr_name)
lookupOrigName :: RdrName -> RnM d Name
lookupOrigName rdr_name
\fbox{{\em Jan 98: this comment is wrong: @rnHsType@ uses it quite a bit.}}
-
\begin{code}
lookupOrigNames :: [RdrName] -> RnM d NameSet
lookupOrigNames rdr_names
returnRn (mkNameSet names)
\end{code}
-lookupSysBinder is used for the "system binders" of a type, class, or instance decl.
-It ensures that the module is set correctly in the name cache, and sets the provenance
-on the returned name too. The returned name will end up actually in the type, class,
-or instance.
+lookupSysBinder is used for the "system binders" of a type, class, or
+instance decl. It ensures that the module is set correctly in the
+name cache, and sets the provenance on the returned name too. The
+returned name will end up actually in the type, class, or instance.
\begin{code}
lookupSysBinder rdr_name
\end{code}
+%*********************************************************
+%* *
+\subsection{Implicit free vars and sugar names}
+%* *
+%*********************************************************
+
+@getXImplicitFVs@ forces the renamer to slurp in some things which aren't
+mentioned explicitly, but which might be needed by the type checker.
+
+\begin{code}
+getImplicitStmtFVs -- Compiling a statement
+ = returnRn (mkFVs [printName, bindIOName, returnIOName, failIOName]
+ `plusFV` ubiquitousNames)
+ -- These are all needed implicitly when compiling a statement
+ -- See TcModule.tc_stmts
+
+getImplicitModuleFVs mod_name decls -- Compiling a module
+ = lookupOrigNames deriv_occs `thenRn` \ deriving_names ->
+ returnRn (deriving_names `plusFV` implicit_main `plusFV` ubiquitousNames)
+ where
+ -- Add occurrences for IO or PrimIO
+ implicit_main | mod_name == mAIN_Name
+ || mod_name == pREL_MAIN_Name = unitFV ioTyConName
+ | otherwise = emptyFVs
+
+ deriv_occs = [occ | TyClD (TyData {tcdDerivs = Just deriv_classes}) <- decls,
+ cls <- deriv_classes,
+ occ <- lookupWithDefaultUFM derivingOccurrences [] cls ]
+
+-- ubiquitous_names are loaded regardless, because
+-- they are needed in virtually every program
+ubiquitousNames
+ = mkFVs [unpackCStringName, unpackCStringFoldrName,
+ unpackCStringUtf8Name, eqStringName]
+ -- Virtually every program has error messages in it somewhere
+
+ `plusFV`
+ mkFVs [getName unitTyCon, funTyConName, boolTyConName, intTyConName]
+ -- Add occurrences for very frequently used types.
+ -- (e.g. we don't want to be bothered with making funTyCon a
+ -- free var at every function application!)
+\end{code}
+
+\begin{code}
+rnSyntaxNames :: GlobalRdrEnv -> FreeVars -> RnMG (FreeVars, SyntaxMap)
+-- Look up the re-bindable syntactic sugar names
+-- Any errors arising from these lookups may surprise the
+-- programmer, since they aren't explicitly mentioned, and
+-- the src line will be unhelpful (ToDo)
+
+rnSyntaxNames gbl_env source_fvs
+ = doptRn Opt_NoImplicitPrelude `thenRn` \ no_prelude ->
+ if not no_prelude then
+ returnRn (source_fvs, vanillaSyntaxMap)
+ else
+
+ -- There's a -fno-implicit-prelude flag,
+ -- so build the re-mapping function
+ let
+ reqd_syntax_list = filter is_reqd syntaxList
+ is_reqd (n,_) = n `elemNameSet` source_fvs
+ lookup (n,rn) = lookupSrcName gbl_env rn `thenRn` \ rn' ->
+ returnRn (n,rn')
+ in
+ mapRn lookup reqd_syntax_list `thenRn` \ rn_syntax_list ->
+ let
+ -- Delete the proxies and add the actuals
+ proxies = map fst rn_syntax_list
+ actuals = map snd rn_syntax_list
+ new_source_fvs = (proxies `delFVs` source_fvs) `plusFV` mkFVs actuals
+
+ syntax_env = mkNameEnv rn_syntax_list
+ syntax_map n = lookupNameEnv syntax_env n `orElse` n
+ in
+ returnRn (new_source_fvs, syntax_map)
+\end{code}
+
%*********************************************************
%* *
newLocalsRn rdr_names_w_loc
= getNameSupplyRn `thenRn` \ name_supply ->
let
- n = length rdr_names_w_loc
(us', us1) = splitUniqSupply (nsUniqs name_supply)
- uniqs = uniqsFromSupply n us1
+ uniqs = uniqsFromSupply us1
names = [ mkLocalName uniq (rdrNameOcc rdr_name) loc
| ((rdr_name,loc), uniq) <- rdr_names_w_loc `zip` uniqs
]
-- Check for duplicate names
checkDupOrQualNames doc_str rdr_names_w_loc `thenRn_`
- doptRn Opt_WarnNameShadowing `thenRn` \ warn_shadow ->
-
-- Warn about shadowing, but only in source modules
(case mode of
- SourceMode | warn_shadow -> mapRn_ (check_shadow name_env) rdr_names_w_loc
- other -> returnRn ()
+ SourceMode -> ifOptRn Opt_WarnNameShadowing $
+ mapRn_ (check_shadow name_env) rdr_names_w_loc
+ other -> returnRn ()
) `thenRn_`
newLocalsRn rdr_names_w_loc `thenRn` \ names ->
bindLocalNames names enclosed_scope
= getLocalNameEnv `thenRn` \ name_env ->
- setLocalNameEnv (addListToRdrEnv name_env pairs)
+ setLocalNameEnv (extendLocalRdrEnv name_env names)
enclosed_scope
- where
- pairs = [(mkRdrUnqual (nameOccName n), n) | n <- names]
bindLocalNamesFV names enclosed_scope
= bindLocalNames names $
\begin{code}
mkGlobalRdrEnv :: ModuleName -- Imported module (after doing the "as M" name change)
-> Bool -- True <=> want unqualified import
- -> Bool -- True <=> want qualified import
- -> [AvailInfo] -- What's to be hidden (but only the unqualified
- -- version is hidden)
-> (Name -> Provenance)
- -> Avails -- Whats imported and how
+ -> Avails -- Whats imported
+ -> Avails -- What's to be hidden
+ -- I.e. import (imports - hides)
+ -> Deprecations
-> GlobalRdrEnv
-mkGlobalRdrEnv this_mod unqual_imp qual_imp hides mk_provenance avails
- = gbl_env2
+mkGlobalRdrEnv this_mod unqual_imp mk_provenance avails hides deprecs
+ = gbl_env3
where
-- Make the name environment. We're talking about a
-- single module here, so there must be no name clashes.
-- In practice there only ever will be if it's the module
-- being compiled.
- -- Add the things that are available
+ -- Add qualified names for the things that are available
+ -- (Qualified names are always imported)
gbl_env1 = foldl add_avail emptyRdrEnv avails
- -- Delete things that are hidden
+ -- Delete (qualified names of) things that are hidden
gbl_env2 = foldl del_avail gbl_env1 hides
+ -- Add unqualified names
+ gbl_env3 | unqual_imp = foldl add_unqual gbl_env2 (rdrEnvToList gbl_env2)
+ | otherwise = gbl_env2
+
+ add_unqual env (qual_name, elts)
+ = foldl add_one env elts
+ where
+ add_one env elt = addOneToGlobalRdrEnv env unqual_name elt
+ unqual_name = unqualifyRdrName qual_name
+ -- The qualified import should only have added one
+ -- binding for each qualified name! But if there's an error in
+ -- the module (multiple bindings for the same name) we may get
+ -- duplicates. So the simple thing is to do the fold.
+
+ del_avail env avail
+ = foldl delOneFromGlobalRdrEnv env rdr_names
+ where
+ rdr_names = map (mkRdrQual this_mod . nameOccName)
+ (availNames avail)
+
+
add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv
add_avail env avail = foldl add_name env (availNames avail)
- add_name env name
- | qual_imp && unqual_imp = env3
- | unqual_imp = env2
- | qual_imp = env1
- | otherwise = env
+ add_name env name -- Add qualified name only
+ = addOneToGlobalRdrEnv env (mkRdrQual this_mod occ) elt
where
- env1 = addOneToGlobalRdrEnv env (mkRdrQual this_mod occ) (name,prov)
- env2 = addOneToGlobalRdrEnv env (mkRdrUnqual occ) (name,prov)
- env3 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) (name,prov)
occ = nameOccName name
- prov = mk_provenance name
-
- del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names
- where
- rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail)
+ elt = GRE name (mk_provenance name) (lookupDeprec deprecs name)
mkIfaceGlobalRdrEnv :: [(ModuleName,Avails)] -> GlobalRdrEnv
-- Used to construct a GlobalRdrEnv for an interface that we've
mkIfaceGlobalRdrEnv m_avails
= foldl add emptyRdrEnv m_avails
where
- add env (mod,avails) = plusGlobalRdrEnv env (mkGlobalRdrEnv mod True False [] (\n -> LocalDef) avails)
+ add env (mod,avails) = plusGlobalRdrEnv env (mkGlobalRdrEnv mod True
+ (\n -> LocalDef) avails [] NoDeprecs)
+ -- The NoDeprecs is a bit of a hack I suppose
\end{code}
\begin{code}
plusGlobalRdrEnv :: GlobalRdrEnv -> GlobalRdrEnv -> GlobalRdrEnv
plusGlobalRdrEnv env1 env2 = plusFM_C combine_globals env1 env2
-addOneToGlobalRdrEnv :: GlobalRdrEnv -> RdrName -> (Name,Provenance) -> GlobalRdrEnv
+addOneToGlobalRdrEnv :: GlobalRdrEnv -> RdrName -> GlobalRdrElt -> GlobalRdrEnv
addOneToGlobalRdrEnv env rdr_name name = addToFM_C combine_globals env rdr_name [name]
delOneFromGlobalRdrEnv :: GlobalRdrEnv -> RdrName -> GlobalRdrEnv
delOneFromGlobalRdrEnv env rdr_name = delFromFM env rdr_name
-combine_globals :: [(Name,Provenance)] -- Old
- -> [(Name,Provenance)] -- New
- -> [(Name,Provenance)]
+combine_globals :: [GlobalRdrElt] -- Old
+ -> [GlobalRdrElt] -- New
+ -> [GlobalRdrElt]
combine_globals ns_old ns_new -- ns_new is often short
= foldr add ns_old ns_new
where
choose n m | n `beats` m = n
| otherwise = m
- (n,pn) `beats` (m,pm) = n==m && pn `hasBetterProv` pm
+ (GRE n pn _) `beats` (GRE m pm _) = n==m && pn `hasBetterProv` pm
- is_duplicate :: (Name,Provenance) -> (Name,Provenance) -> Bool
- is_duplicate (n1,LocalDef) (n2,LocalDef) = False
- is_duplicate (n1,_) (n2,_) = n1 == n2
+ is_duplicate :: GlobalRdrElt -> GlobalRdrElt -> Bool
+ is_duplicate (GRE n1 LocalDef _) (GRE n2 LocalDef _) = False
+ is_duplicate (GRE n1 _ _) (GRE n2 _ _) = n1 == n2
\end{code}
We treat two bindings of a locally-defined name as a duplicate,
\begin{code}
unQualInScope :: GlobalRdrEnv -> Name -> Bool
+-- True if 'f' is in scope, and has only one binding
+-- (i.e. false if A.f and B.f are both in scope as unqualified 'f')
unQualInScope env
= (`elemNameSet` unqual_names)
where
unqual_names :: NameSet
unqual_names = foldRdrEnv add emptyNameSet env
- add rdr_name [(name,_)] unquals | isUnqual rdr_name = addOneToNameSet unquals name
- add _ _ unquals = unquals
+ add rdr_name [GRE name _ _] unquals | isUnqual rdr_name = addOneToNameSet unquals name
+ add _ _ unquals = unquals
\end{code}
\begin{code}
warnUnusedModules :: [ModuleName] -> RnM d ()
warnUnusedModules mods
- = doptRn Opt_WarnUnusedImports `thenRn` \ warn ->
- if warn then mapRn_ (addWarnRn . unused_mod) mods
- else returnRn ()
+ = ifOptRn Opt_WarnUnusedImports (mapRn_ (addWarnRn . unused_mod) mods)
where
unused_mod m = vcat [ptext SLIT("Module") <+> quotes (ppr m) <+>
text "is imported, but nothing from it is used",
warnUnusedImports :: [(Name,Provenance)] -> RnM d ()
warnUnusedImports names
- = doptRn Opt_WarnUnusedImports `thenRn` \ warn ->
- if warn then warnUnusedBinds names else returnRn ()
+ = ifOptRn Opt_WarnUnusedImports (warnUnusedBinds names)
warnUnusedLocalBinds, warnUnusedMatches :: [Name] -> RnM d ()
warnUnusedLocalBinds names
- = doptRn Opt_WarnUnusedBinds `thenRn` \ warn ->
- if warn then warnUnusedBinds [(n,LocalDef) | n<-names]
- else returnRn ()
+ = ifOptRn Opt_WarnUnusedBinds (warnUnusedBinds [(n,LocalDef) | n<-names])
warnUnusedMatches names
- = doptRn Opt_WarnUnusedMatches `thenRn` \ warn ->
- if warn then warnUnusedGroup [(n,LocalDef) | n<-names]
- else returnRn ()
+ = ifOptRn Opt_WarnUnusedMatches (warnUnusedGroup [(n,LocalDef) | n<-names])
-------------------------
where
msg1 = ptext SLIT("either") <+> mk_ref np1
msgs = [ptext SLIT(" or") <+> mk_ref np | np <- nps]
- mk_ref (name,prov) = quotes (ppr name) <> comma <+> pprNameProvenance name prov
-
-fixityClashErr (rdr_name, ((_,how_in_scope1), (_, how_in_scope2)))
- = hang (hsep [ptext SLIT("Conflicting fixities for"), quotes (ppr rdr_name)])
- 4 (vcat [ppr how_in_scope1,
- ppr how_in_scope2])
+ mk_ref (GRE name prov _) = quotes (ppr name) <> comma <+> pprNameProvenance name prov
shadowedNameWarn shadow
= hsep [ptext SLIT("This binding for"),
= pushSrcLocRn loc $
addErrRn ((ptext SLIT("Conflicting definitions for") <+> quotes (ppr name))
$$
- (ptext SLIT("in") <+> descriptor))
+ descriptor)
+
+warnDeprec :: Name -> DeprecTxt -> RnM d ()
+warnDeprec name txt
+ = ifOptRn Opt_WarnDeprecations $
+ addWarnRn (sep [ text (occNameFlavour (nameOccName name)) <+>
+ quotes (ppr name) <+> text "is deprecated:",
+ nest 4 (ppr txt) ])
\end{code}
+
projects / ghc-hetmet.git / blobdiff