X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnEnv.lhs;h=d7167ad857be66c750610024460c43d7181236ba;hb=47108330f6f832dd82aba3d125a1ad114f4a45e7;hp=0d998852501adcd383898102c5a9a42cb3428762;hpb=17879095049f5705c9734cab4f4c5d56f61f81a7;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnEnv.lhs b/ghc/compiler/rename/RnEnv.lhs index 0d99885..d7167ad 100644 --- a/ghc/compiler/rename/RnEnv.lhs +++ b/ghc/compiler/rename/RnEnv.lhs @@ -8,37 +8,54 @@ module RnEnv where -- Export everything #include "HsVersions.h" +import {-# SOURCE #-} RnHiFiles + import HsSyn import RdrHsSyn ( RdrNameIE ) -import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual, - mkRdrUnqual, qualifyRdrName +import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual, isOrig, + mkRdrUnqual, mkRdrQual, lookupRdrEnv, foldRdrEnv ) -import HsTypes ( hsTyVarName, hsTyVarNames, replaceTyVarName ) +import HsTypes ( hsTyVarName, replaceTyVarName ) import HscTypes ( Provenance(..), pprNameProvenance, hasBetterProv, - ImportReason(..), GlobalRdrEnv, Avails, AvailEnv, - AvailInfo, GenAvailInfo(..), RdrAvailInfo ) + ImportReason(..), GlobalRdrEnv, GlobalRdrElt(..), AvailEnv, + AvailInfo, Avails, GenAvailInfo(..), NameSupply(..), + ModIface(..), + Deprecations(..), lookupDeprec, + extendLocalRdrEnv + ) import RnMonad -import Name ( Name, NamedThing(..), - getSrcLoc, - mkLocalName, mkImportedLocalName, mkGlobalName, - mkIPName, isLocallyDefined, - nameOccName, nameModule, - extendNameEnv_C, plusNameEnv_C, nameEnvElts, +import Name ( Name, + getSrcLoc, nameIsLocalOrFrom, + mkLocalName, mkGlobalName, + mkIPName, nameOccName, nameModule_maybe, setNameModuleAndLoc ) +import NameEnv import NameSet import OccName ( OccName, occNameUserString, occNameFlavour ) -import Module ( ModuleName, moduleName, mkVanillaModule ) +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 Unique ( Unique ) import UniqSupply import SrcLoc ( SrcLoc, noSrcLoc ) import Outputable import ListSetOps ( removeDups, equivClasses ) -import Util ( thenCmp, sortLt ) +import Util ( sortLt ) import List ( nub ) -import PrelNames ( mkUnboundName ) +import UniqFM ( lookupWithDefaultUFM ) +import Maybes ( orElse ) import CmdLineOpts +import FastString ( FastString ) \end{code} %********************************************************* @@ -49,14 +66,29 @@ import CmdLineOpts \begin{code} newTopBinder :: Module -> RdrName -> SrcLoc -> RnM d Name + -- newTopBinder puts into the cache the binder with the + -- module information set correctly. When the decl is later renamed, + -- the binding site will thereby get the correct module. + -- There maybe occurrences that don't have the correct Module, but + -- by the typechecker will propagate the binding definition to all + -- the occurrences, so that doesn't matter + newTopBinder mod rdr_name loc = -- First check the cache - traceRn (text "newTopBinder" <+> ppr mod <+> ppr loc) `thenRn_` - getNameSupplyRn `thenRn` \ (us, cache, ipcache) -> + -- 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 + (if isQual rdr_name then + qualNameErr (text "its declaration") (rdr_name,loc) + else + returnRn () + ) `thenRn_` + + getNameSupplyRn `thenRn` \ name_supply -> let occ = rdrNameOcc rdr_name key = (moduleName mod, occ) + cache = nsNames name_supply in case lookupFM cache key of @@ -71,8 +103,8 @@ newTopBinder mod rdr_name loc new_name = setNameModuleAndLoc name mod loc new_cache = addToFM cache key new_name in - setNameSupplyRn (us, new_cache, ipcache) `thenRn_` - traceRn (text "newTopBinder: overwrite" <+> ppr new_name) `thenRn_` + setNameSupplyRn (name_supply {nsNames = new_cache}) `thenRn_` +-- traceRn (text "newTopBinder: overwrite" <+> ppr new_name) `thenRn_` returnRn new_name -- Miss in the cache! @@ -80,13 +112,13 @@ newTopBinder mod rdr_name loc -- Even for locally-defined names we use implicitImportProvenance; -- updateProvenances will set it to rights Nothing -> let - (us', us1) = splitUniqSupply us + (us', us1) = splitUniqSupply (nsUniqs name_supply) uniq = uniqFromSupply us1 new_name = mkGlobalName uniq mod occ loc new_cache = addToFM cache key new_name in - setNameSupplyRn (us', new_cache, ipcache) `thenRn_` - traceRn (text "newTopBinder: new" <+> ppr new_name) `thenRn_` + setNameSupplyRn (name_supply {nsUniqs = us', nsNames = new_cache}) `thenRn_` +-- traceRn (text "newTopBinder: new" <+> ppr new_name) `thenRn_` returnRn new_name @@ -109,32 +141,36 @@ newGlobalName :: ModuleName -> OccName -> RnM d Name -- (but since it affects DLL-ery it does matter that we get it right -- in the end). newGlobalName mod_name occ - = getNameSupplyRn `thenRn` \ (us, cache, ipcache) -> + = getNameSupplyRn `thenRn` \ name_supply -> let key = (mod_name, occ) + cache = nsNames name_supply in case lookupFM cache key of - Just name -> traceRn (text "newGlobalName: hit" <+> ppr name) `thenRn_` + Just name -> -- traceRn (text "newGlobalName: hit" <+> ppr name) `thenRn_` returnRn name - Nothing -> setNameSupplyRn (us', new_cache, ipcache) `thenRn_` - traceRn (text "newGlobalName: new" <+> ppr name) `thenRn_` + Nothing -> setNameSupplyRn (name_supply {nsUniqs = us', nsNames = new_cache}) `thenRn_` + -- traceRn (text "newGlobalName: new" <+> ppr name) `thenRn_` returnRn name where - (us', us1) = splitUniqSupply us + (us', us1) = splitUniqSupply (nsUniqs name_supply) uniq = uniqFromSupply us1 mod = mkVanillaModule mod_name name = mkGlobalName uniq mod occ noSrcLoc new_cache = addToFM cache key name newIPName rdr_name - = getNameSupplyRn `thenRn` \ (us, cache, ipcache) -> + = getNameSupplyRn `thenRn` \ name_supply -> + let + ipcache = nsIPs name_supply + in case lookupFM ipcache key of Just name -> returnRn name - Nothing -> setNameSupplyRn (us', cache, new_ipcache) `thenRn_` + Nothing -> setNameSupplyRn (name_supply {nsUniqs = us', nsIPs = new_ipcache}) `thenRn_` returnRn name where - (us', us1) = splitUniqSupply us + (us', us1) = splitUniqSupply (nsUniqs name_supply) uniq = uniqFromSupply us1 name = mkIPName uniq key new_ipcache = addToFM ipcache key name @@ -157,28 +193,38 @@ lookupBndrRn rdr_name Nothing -> lookupTopBndrRn rdr_name lookupTopBndrRn 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 + + | otherwise = getModeRn `thenRn` \ mode -> - case mode of - InterfaceMode -> -- Look in the global name cache - 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 -> - case lookupRdrEnv global_env (qualifyRdrName (moduleName mod) rdr_name) of - Just ((name,_):rest) -> ASSERT( null rest ) - returnRn name - Nothing -> -- Almost always this case is a compiler bug. - -- But consider a type signature that doesn't have - -- a corresponding binder: - -- module M where { f :: Int->Int } - -- We use lookupSigOccRn, which uses lookupBndrRn (for good reasons) - -- and we don't want to panic. So we report an out-of-scope error - failWithRn (mkUnboundName rdr_name) - (unknownNameErr rdr_name) + 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? @@ -205,27 +251,85 @@ lookupOccRn rdr_name -- environment. It's used only for -- record field names -- class op names in class and instance decls -lookupGlobalOccRn rdr_name - = getModeRn `thenRn` \ mode -> - case mode of { - -- When processing interface files, the global env - -- is always empty, so go straight to the name cache - InterfaceMode -> lookupOrigName rdr_name ; - SourceMode -> +lookupGlobalOccRn rdr_name + = getModeRn `thenRn` \ mode -> + if (isInterfaceMode mode) + then lookupIfaceName rdr_name + else getGlobalNameEnv `thenRn` \ global_env -> - case lookupRdrEnv global_env rdr_name of - Just [(name,_)] -> returnRn name - Just stuff@((name,_):_) - -> addNameClashErrRn rdr_name stuff `thenRn_` - returnRn name - Nothing -> -- Not found when processing source code; so fail - failWithRn (mkUnboundName rdr_name) - (unknownNameErr rdr_name) - } + 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 +lookupSrcName global_env rdr_name + | isOrig rdr_name -- Can occur in source code too + = lookupOrigName rdr_name + + | otherwise + = case lookupRdrEnv global_env rdr_name of + 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 + = ASSERT( isOrig rdr_name ) + newGlobalName (rdrNameModule rdr_name) (rdrNameOcc rdr_name) + +lookupIfaceUnqual :: RdrName -> RnM d Name +lookupIfaceUnqual rdr_name + = ASSERT( isUnqual rdr_name ) + -- An Unqual is allowed; interface files contain + -- unqualified names for locally-defined things, such as + -- constructors of a data type. + getModuleRn `thenRn ` \ mod -> + newGlobalName (moduleName mod) (rdrNameOcc rdr_name) + +lookupIfaceName :: RdrName -> RnM d Name +lookupIfaceName rdr_name + | isUnqual rdr_name = lookupIfaceUnqual rdr_name + | otherwise = lookupOrigName rdr_name \end{code} -% @lookupOrigName@ takes an RdrName representing an {\em original} name, and adds it to the occurrence pool so that it'll be loaded @@ -241,34 +345,17 @@ calls it at all I think). \fbox{{\em Jan 98: this comment is wrong: @rnHsType@ uses it quite a bit.}} -For List and Tuple types it's important to get the correct -@isLocallyDefined@ flag, which is used in turn when deciding -whether there are any instance decls in this module are ``special''. -The name cache should have the correct provenance, though. - \begin{code} -lookupOrigName :: RdrName -> RnM d Name -lookupOrigName rdr_name - | isQual rdr_name - = newGlobalName (rdrNameModule rdr_name) (rdrNameOcc rdr_name) - - | otherwise - = -- An Unqual is allowed; interface files contain - -- unqualified names for locally-defined things, such as - -- constructors of a data type. - getModuleRn `thenRn ` \ mod -> - newGlobalName (moduleName mod) (rdrNameOcc rdr_name) - lookupOrigNames :: [RdrName] -> RnM d NameSet lookupOrigNames rdr_names = mapRn lookupOrigName rdr_names `thenRn` \ 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 @@ -279,6 +366,83 @@ 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} + %********************************************************* %* * @@ -287,20 +451,18 @@ lookupSysBinder rdr_name %********************************************************* \begin{code} -newLocalsRn :: (Unique -> OccName -> SrcLoc -> Name) - -> [(RdrName,SrcLoc)] +newLocalsRn :: [(RdrName,SrcLoc)] -> RnMS [Name] -newLocalsRn mk_name rdr_names_w_loc - = getNameSupplyRn `thenRn` \ (us, cache, ipcache) -> +newLocalsRn rdr_names_w_loc + = getNameSupplyRn `thenRn` \ name_supply -> let - n = length rdr_names_w_loc - (us', us1) = splitUniqSupply us - uniqs = uniqsFromSupply n us1 - names = [ mk_name uniq (rdrNameOcc rdr_name) loc + (us', us1) = splitUniqSupply (nsUniqs name_supply) + uniqs = uniqsFromSupply us1 + names = [ mkLocalName uniq (rdrNameOcc rdr_name) loc | ((rdr_name,loc), uniq) <- rdr_names_w_loc `zip` uniqs ] in - setNameSupplyRn (us', cache, ipcache) `thenRn_` + setNameSupplyRn (name_supply {nsUniqs = us'}) `thenRn_` returnRn names @@ -315,22 +477,14 @@ bindLocatedLocalsRn doc_str rdr_names_w_loc enclosed_scope -- 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_` - let - mk_name = case mode of - SourceMode -> mkLocalName - InterfaceMode -> mkImportedLocalName - -- Keep track of whether the name originally came from - -- an interface file. - in - newLocalsRn mk_name rdr_names_w_loc `thenRn` \ names -> + newLocalsRn rdr_names_w_loc `thenRn` \ names -> let new_local_env = addListToRdrEnv name_env (map fst rdr_names_w_loc `zip` names) in @@ -343,41 +497,43 @@ bindLocatedLocalsRn doc_str rdr_names_w_loc enclosed_scope Just name -> pushSrcLocRn loc $ addWarnRn (shadowedNameWarn rdr_name) -bindCoreLocalFVRn :: RdrName -> (Name -> RnMS (a, FreeVars)) - -> RnMS (a, FreeVars) +bindCoreLocalRn :: RdrName -> (Name -> RnMS a) -> RnMS a -- A specialised variant when renaming stuff from interface -- files (of which there is a lot) -- * one at a time -- * no checks for shadowing -- * always imported -- * deal with free vars -bindCoreLocalFVRn rdr_name enclosed_scope +bindCoreLocalRn rdr_name enclosed_scope = getSrcLocRn `thenRn` \ loc -> getLocalNameEnv `thenRn` \ name_env -> - getNameSupplyRn `thenRn` \ (us, cache, ipcache) -> + getNameSupplyRn `thenRn` \ name_supply -> let - (us', us1) = splitUniqSupply us + (us', us1) = splitUniqSupply (nsUniqs name_supply) uniq = uniqFromSupply us1 - name = mkImportedLocalName uniq (rdrNameOcc rdr_name) loc + name = mkLocalName uniq (rdrNameOcc rdr_name) loc in - setNameSupplyRn (us', cache, ipcache) `thenRn_` + setNameSupplyRn (name_supply {nsUniqs = us'}) `thenRn_` let new_name_env = extendRdrEnv name_env rdr_name name in - setLocalNameEnv new_name_env (enclosed_scope name) `thenRn` \ (result, fvs) -> - returnRn (result, delFromNameSet fvs name) + setLocalNameEnv new_name_env (enclosed_scope name) -bindCoreLocalsFVRn [] thing_inside = thing_inside [] -bindCoreLocalsFVRn (b:bs) thing_inside = bindCoreLocalFVRn b $ \ name' -> - bindCoreLocalsFVRn bs $ \ names' -> - thing_inside (name':names') +bindCoreLocalsRn [] thing_inside = thing_inside [] +bindCoreLocalsRn (b:bs) thing_inside = bindCoreLocalRn b $ \ name' -> + bindCoreLocalsRn bs $ \ names' -> + thing_inside (name':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 $ + enclosed_scope `thenRn` \ (thing, fvs) -> + returnRn (thing, delListFromNameSet fvs names) + ------------------------------------- bindLocalRn doc rdr_name enclosed_scope @@ -400,12 +556,8 @@ bindLocalsFVRn doc rdr_names enclosed_scope returnRn (thing, delListFromNameSet fvs names) ------------------------------------- -bindUVarRn :: SDoc -> RdrName -> (Name -> RnMS (a, FreeVars)) -> RnMS (a, FreeVars) -bindUVarRn = bindLocalRn - -------------------------------------- extendTyVarEnvFVRn :: [Name] -> RnMS (a, FreeVars) -> RnMS (a, FreeVars) - -- This tiresome function is used only in rnDecl on InstDecl + -- This tiresome function is used only in rnSourceDecl on InstDecl extendTyVarEnvFVRn tyvars enclosed_scope = bindLocalNames tyvars enclosed_scope `thenRn` \ (thing, fvs) -> returnRn (thing, delListFromNameSet fvs tyvars) @@ -469,7 +621,7 @@ checkDupOrQualNames doc_str rdr_names_w_loc mapRn_ (qualNameErr doc_str) quals `thenRn_` checkDupNames doc_str rdr_names_w_loc where - quals = filter (isQual.fst) rdr_names_w_loc + quals = filter (isQual . fst) rdr_names_w_loc checkDupNames doc_str rdr_names_w_loc = -- Check for duplicated names in a binding group @@ -486,18 +638,76 @@ checkDupNames doc_str rdr_names_w_loc %************************************************************************ \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 + -> Deprecations + -> GlobalRdrEnv + +mkGlobalRdrEnv this_mod unqual_imp qual_imp hides + mk_provenance avails deprecs + = gbl_env2 + 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 + gbl_env1 = foldl add_avail emptyRdrEnv avails + + -- Delete things that are hidden + gbl_env2 = foldl del_avail gbl_env1 hides + + 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 + where + env1 = addOneToGlobalRdrEnv env (mkRdrQual this_mod occ) elt + env2 = addOneToGlobalRdrEnv env (mkRdrUnqual occ) elt + env3 = addOneToGlobalRdrEnv env1 (mkRdrUnqual occ) elt + occ = nameOccName name + elt = GRE name (mk_provenance name) (lookupDeprec deprecs name) + + del_avail env avail = foldl delOneFromGlobalRdrEnv env rdr_names + where + rdr_names = map (mkRdrUnqual . nameOccName) (availNames avail) + +mkIfaceGlobalRdrEnv :: [(ModuleName,Avails)] -> GlobalRdrEnv +-- Used to construct a GlobalRdrEnv for an interface that we've +-- read from a .hi file. We can't construct the original top-level +-- environment because we don't have enough info, but we compromise +-- by making an environment from its exports +mkIfaceGlobalRdrEnv m_avails + = foldl add emptyRdrEnv m_avails + where + add env (mod,avails) = plusGlobalRdrEnv env (mkGlobalRdrEnv mod True False [] + (\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 @@ -507,11 +717,11 @@ combine_globals ns_old ns_new -- ns_new is often short 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, @@ -534,12 +744,15 @@ in error messages. \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 - = lookup + = (`elemNameSet` unqual_names) where - lookup name = case lookupRdrEnv env (mkRdrUnqual (nameOccName name)) of - Just [(name',_)] -> name == name' - other -> False + unqual_names :: NameSet + unqual_names = foldRdrEnv add emptyNameSet env + add rdr_name [GRE name _ _] unquals | isUnqual rdr_name = addOneToNameSet unquals name + add _ _ unquals = unquals \end{code} @@ -554,7 +767,7 @@ plusAvail (Avail n1) (Avail n2) = Avail n1 plusAvail (AvailTC n1 ns1) (AvailTC n2 ns2) = AvailTC n2 (nub (ns1 ++ ns2)) -- Added SOF 4/97 #ifdef DEBUG -plusAvail a1 a2 = pprPanic "RnEnv.plusAvail" (hsep [pprAvail a1,pprAvail a2]) +plusAvail a1 a2 = pprPanic "RnEnv.plusAvail" (hsep [ppr a1,ppr a2]) #endif addAvail :: AvailEnv -> AvailInfo -> AvailEnv @@ -583,16 +796,7 @@ availNames :: GenAvailInfo name -> [name] availNames (Avail n) = [n] availNames (AvailTC n ns) = ns -addSysAvails :: AvailInfo -> [Name] -> AvailInfo -addSysAvails avail [] = avail -addSysAvails (AvailTC n ns) sys = AvailTC n (sys ++ ns) - -rdrAvailInfo :: AvailInfo -> RdrAvailInfo --- Used when building the avails we are going to put in an interface file --- We sort the components to reduce needless wobbling of interfaces -rdrAvailInfo (Avail n) = Avail (nameOccName n) -rdrAvailInfo (AvailTC n ns) = AvailTC (nameOccName n) (sortLt (<) (map nameOccName ns)) - +------------------------------------- filterAvail :: RdrNameIE -- Wanted -> AvailInfo -- Available -> Maybe AvailInfo -- Resulting available; @@ -628,12 +832,43 @@ filterAvail (IEThingAll _) avail@(AvailTC _ _) = Just avail filterAvail ie avail = Nothing -pprAvail :: AvailInfo -> SDoc -pprAvail (AvailTC n ns) = ppr n <> case filter (/= n) ns of - [] -> empty - ns' -> parens (hsep (punctuate comma (map ppr ns'))) +------------------------------------- +groupAvails :: Module -> Avails -> [(ModuleName, Avails)] + -- Group by module and sort by occurrence + -- This keeps the list in canonical order +groupAvails this_mod avails + = [ (mkSysModuleNameFS fs, sortLt lt avails) + | (fs,avails) <- fmToList groupFM + ] + where + groupFM :: FiniteMap FastString Avails + -- Deliberately use the FastString so we + -- get a canonical ordering + groupFM = foldl add emptyFM avails -pprAvail (Avail n) = ppr n + add env avail = addToFM_C combine env mod_fs [avail'] + where + mod_fs = moduleNameFS (moduleName avail_mod) + avail_mod = case nameModule_maybe (availName avail) of + Just m -> m + Nothing -> this_mod + combine old _ = avail':old + avail' = sortAvail avail + + a1 `lt` a2 = occ1 < occ2 + where + occ1 = nameOccName (availName a1) + occ2 = nameOccName (availName a2) + +sortAvail :: AvailInfo -> AvailInfo +-- Sort the sub-names into canonical order. +-- The canonical order has the "main name" at the beginning +-- (if it's there at all) +sortAvail (Avail n) = Avail n +sortAvail (AvailTC n ns) | n `elem` ns = AvailTC n (n : sortLt lt (filter (/= n) ns)) + | otherwise = AvailTC n ( sortLt lt ns) + where + n1 `lt` n2 = nameOccName n1 < nameOccName n2 \end{code} @@ -644,25 +879,6 @@ pprAvail (Avail n) = ppr n %************************************************************************ \begin{code} -type FreeVars = NameSet - -plusFV :: FreeVars -> FreeVars -> FreeVars -addOneFV :: FreeVars -> Name -> FreeVars -unitFV :: Name -> FreeVars -emptyFVs :: FreeVars -plusFVs :: [FreeVars] -> FreeVars -mkFVs :: [Name] -> FreeVars - -isEmptyFVs = isEmptyNameSet -emptyFVs = emptyNameSet -plusFVs = unionManyNameSets -plusFV = unionNameSets -mkFVs = mkNameSet - --- No point in adding implicitly imported names to the free-var set -addOneFV s n = addOneToNameSet s n -unitFV n = unitNameSet n - -- A useful utility mapFvRn f xs = mapRn f xs `thenRn` \ stuff -> let @@ -679,32 +895,25 @@ mapFvRn f xs = mapRn f xs `thenRn` \ stuff -> %************************************************************************ \begin{code} -warnUnusedModules :: [Module] -> RnM d () +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", parens (ptext SLIT("except perhaps to re-export instances visible in") <+> - quotes (ppr (moduleName m)))] + quotes (ppr m))] 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]) ------------------------- @@ -734,7 +943,7 @@ warnUnusedGroup names = case prov1 of LocalDef -> (True, getSrcLoc name1, text "Defined but not used") - NonLocalDef (UserImport mod loc _) _ + NonLocalDef (UserImport mod loc _) -> (True, loc, text "Imported from" <+> quotes (ppr mod) <+> text "but not used") reportable (name,_) = case occNameUserString (nameOccName name) of @@ -751,12 +960,7 @@ addNameClashErrRn rdr_name (np1:nps) 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"), @@ -779,5 +983,13 @@ dupNamesErr descriptor ((name,loc) : dup_things) = 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} +