#include "HsVersions.h"
-import CmdLineOpts ( opt_WarnNameShadowing, opt_WarnUnusedMatches,
- opt_WarnUnusedBinds, opt_WarnUnusedImports )
+import {-# SOURCE #-} RnHiFiles
+
+import FlattenInfo ( namesNeededForFlattening )
import HsSyn
-import RdrHsSyn ( RdrNameIE )
-import RnHsSyn ( RenamedHsType )
-import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual,
- mkRdrUnqual, qualifyRdrName
+import RdrHsSyn ( RdrNameIE, RdrNameHsType, extractHsTyRdrTyVars )
+import RdrName ( RdrName, rdrNameModule, rdrNameOcc, isQual, isUnqual, isOrig,
+ mkRdrUnqual, mkRdrQual,
+ lookupRdrEnv, foldRdrEnv, rdrEnvToList, elemRdrEnv,
+ unqualifyRdrName
+ )
+import HsTypes ( hsTyVarName, replaceTyVarName )
+import HscTypes ( Provenance(..), pprNameProvenance, hasBetterProv,
+ ImportReason(..), GlobalRdrEnv, GlobalRdrElt(..), AvailEnv,
+ AvailInfo, Avails, GenAvailInfo(..), NameSupply(..),
+ ModIface(..), GhciMode(..),
+ Deprecations(..), lookupDeprec,
+ extendLocalRdrEnv
)
-import HsTypes ( getTyVarName, replaceTyVarName )
-
import RnMonad
-import Name ( Name, Provenance(..), ExportFlag(..), NamedThing(..),
- ImportReason(..), getSrcLoc,
- mkLocalName, mkImportedLocalName, mkGlobalName, mkUnboundName,
- mkIPName, isSystemName, isWiredInName,
- nameOccName, setNameModule, nameModule,
- pprOccName, isLocallyDefined, nameUnique, nameOccName,
- occNameUserString,
- setNameProvenance, getNameProvenance, pprNameProvenance
+import Name ( Name,
+ getSrcLoc, nameIsLocalOrFrom,
+ mkLocalName, mkGlobalName,
+ mkIPName, nameOccName, nameModule_maybe,
+ setNameModuleAndLoc
)
+import NameEnv
import NameSet
-import OccName ( OccName,
- mkDFunOcc, occNameUserString, occNameString,
- occNameFlavour
+import OccName ( OccName, occNameUserString, occNameFlavour )
+import Module ( ModuleName, moduleName, mkVanillaModule,
+ mkSysModuleNameFS, moduleNameFS, WhereFrom(..) )
+import PrelNames ( mkUnboundName,
+ derivingOccurrences,
+ mAIN_Name, main_RDR_Unqual,
+ runMainName, intTyConName,
+ boolTyConName, funTyConName,
+ unpackCStringName, unpackCStringFoldrName, unpackCStringUtf8Name,
+ eqStringName, printName,
+ bindIOName, returnIOName, failIOName
)
-import TysWiredIn ( tupleTyCon, unboxedTupleTyCon, listTyCon )
-import Type ( funTyCon )
-import Module ( ModuleName, mkThisModule, moduleName, mkVanillaModule, pprModuleName )
-import TyCon ( TyCon )
+import TysWiredIn ( unitTyCon ) -- A little odd
import FiniteMap
-import Unique ( Unique, Uniquable(..) )
import UniqSupply
import SrcLoc ( SrcLoc, noSrcLoc )
import Outputable
-import Util ( removeDups, equivClasses, thenCmp )
+import ListSetOps ( removeDups, equivClasses )
+import Util ( sortLt )
+import BasicTypes ( mapIPName )
import List ( nub )
+import UniqFM ( lookupWithDefaultUFM )
+import Maybe ( mapMaybe )
+import CmdLineOpts
+import FastString ( FastString )
\end{code}
-
-
%*********************************************************
%* *
\subsection{Making new names}
%*********************************************************
\begin{code}
-newLocalTopBinder :: Module -> OccName
- -> (Name -> ExportFlag) -> SrcLoc
- -> RnM d Name
-newLocalTopBinder mod occ rec_exp_fn loc
- = newTopBinder mod occ (\name -> setNameProvenance name (LocalDef loc (rec_exp_fn name)))
- -- We must set the provenance of the thing in the cache
- -- correctly, particularly whether or not it is locally defined.
- --
- -- Since newLocalTopBinder is used only
- -- at binding occurrences, we may as well get the provenance
- -- dead right first time; hence the rec_exp_fn passed in
-
-newImportedBinder :: Module -> RdrName -> RnM d Name
-newImportedBinder mod rdr_name
- = ASSERT2( isUnqual rdr_name, ppr rdr_name )
- newTopBinder mod (rdrNameOcc rdr_name) (\name -> name)
- -- Provenance is already implicitImportProvenance
+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
-implicitImportProvenance = NonLocalDef ImplicitImport False
+ -- 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 "In its declaration") (rdr_name,loc)
+ else
+ returnRn ()
+ ) `thenRn_`
-newTopBinder :: Module -> OccName -> (Name -> Name) -> RnM d Name
-newTopBinder mod occ set_prov
- = -- First check the cache
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
+ getNameSupplyRn `thenRn` \ name_supply ->
let
- key = (moduleName mod, occ)
+ occ = rdrNameOcc rdr_name
+ key = (moduleName mod, occ)
+ cache = nsNames name_supply
in
case lookupFM cache key of
- -- A hit in the cache!
- -- Set the Module of the thing, and set its provenance (hack pending
- -- spj update)
- --
- -- It also means that if there are two defns for the same thing
- -- in a module, then each gets a separate SrcLoc
- --
- -- There's a complication for wired-in names. We don't want to
- -- forget that they are wired in even when compiling that module
- -- (else we spit out redundant defns into the interface file)
- -- So for them we just set the provenance
+ -- A hit in the cache! We are at the binding site of the name, and
+ -- this is the moment when we know all about
+ -- a) the Name's host Module (in particular, which
+ -- package it comes from)
+ -- b) its defining SrcLoc
+ -- So we update this info
Just name -> let
- new_name = set_prov (setNameModule name mod)
+ new_name = setNameModuleAndLoc name mod loc
new_cache = addToFM cache key new_name
in
- setNameSupplyRn (us, inst_ns, new_cache, ipcache) `thenRn_`
+ setNameSupplyRn (name_supply {nsNames = new_cache}) `thenRn_`
+-- traceRn (text "newTopBinder: overwrite" <+> ppr new_name) `thenRn_`
returnRn new_name
-- Miss in the cache!
-- Build a completely new Name, and put it in the cache
+ -- 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 = set_prov (mkGlobalName uniq mod occ implicitImportProvenance)
+ new_name = mkGlobalName uniq mod occ loc
new_cache = addToFM cache key new_name
in
- setNameSupplyRn (us', inst_ns, new_cache, ipcache) `thenRn_`
+ setNameSupplyRn (name_supply {nsUniqs = us', nsNames = new_cache}) `thenRn_`
+-- traceRn (text "newTopBinder: new" <+> ppr new_name) `thenRn_`
returnRn new_name
-mkImportedGlobalName :: ModuleName -> OccName -> RnM d Name
+newGlobalName :: ModuleName -> OccName -> RnM d Name
-- Used for *occurrences*. We make a place-holder Name, really just
-- to agree on its unique, which gets overwritten when we read in
- -- the binding occurence later (newImportedBinder)
- -- The place-holder Name doesn't have the right Provenance, and its
- -- Module won't have the right Package either
+ -- the binding occurence later (newTopBinder)
+ -- The place-holder Name doesn't have the right SrcLoc, and its
+ -- Module won't have the right Package either.
+ --
+ -- (We have to pass a ModuleName, not a Module, because we may be
+ -- simply looking at an occurrence M.x in an interface file.)
--
-- This means that a renamed program may have incorrect info
-- on implicitly-imported occurrences, but the correct info on the
-- it doesn't matter that we get the correct info in place till later,
-- (but since it affects DLL-ery it does matter that we get it right
-- in the end).
-mkImportedGlobalName mod_name occ
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
+newGlobalName mod_name occ
+ = getNameSupplyRn `thenRn` \ name_supply ->
let
key = (mod_name, occ)
+ cache = nsNames name_supply
in
case lookupFM cache key of
- Just name -> returnRn name
- Nothing -> setNameSupplyRn (us', inst_ns, new_cache, ipcache) `thenRn_`
+ Just name -> -- traceRn (text "newGlobalName: hit" <+> ppr name) `thenRn_`
+ returnRn name
+
+ 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 implicitImportProvenance
+ name = mkGlobalName uniq mod occ noSrcLoc
new_cache = addToFM cache key name
-updateProvenances :: [Name] -> RnM d ()
--- Update the provenances of everything that is in scope.
--- We must be careful not to disturb the Module package info
--- already in the cache. Why not? Consider
--- module A module M( f )
--- import M( f ) import N( f)
--- import N
--- So f is defined in N, and M re-exports it.
--- When processing module A:
--- 1. We read M.hi first, and make a vanilla name N.f
--- (without reading N.hi). The package info says <THIS>
--- for lack of anything better.
--- 2. Now we read N, which update the cache to record
--- the correct package for N.f.
--- 3. Finally we update provenances (once we've read all imports).
--- Step 3 must not destroy package info recorded in Step 2.
-
-updateProvenances names
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- setNameSupplyRn (us, inst_ns, foldr update cache names, ipcache)
+newIPName rdr_name_ip
+ = getNameSupplyRn `thenRn` \ name_supply ->
+ let
+ ipcache = nsIPs name_supply
+ in
+ case lookupFM ipcache key of
+ Just name_ip -> returnRn name_ip
+ Nothing -> setNameSupplyRn new_ns `thenRn_`
+ returnRn name_ip
+ where
+ (us', us1) = splitUniqSupply (nsUniqs name_supply)
+ uniq = uniqFromSupply us1
+ name_ip = mapIPName mk_name rdr_name_ip
+ mk_name rdr_name = mkIPName uniq (rdrNameOcc rdr_name)
+ new_ipcache = addToFM ipcache key name_ip
+ new_ns = name_supply {nsUniqs = us', nsIPs = new_ipcache}
+ where
+ key = rdr_name_ip -- Ensures that ?x and %x get distinct Names
+\end{code}
+
+%*********************************************************
+%* *
+\subsection{Looking up names}
+%* *
+%*********************************************************
+
+Looking up a name in the RnEnv.
+
+\begin{code}
+lookupBndrRn rdr_name
+ = getLocalNameEnv `thenRn` \ local_env ->
+ case lookupRdrEnv local_env rdr_name of
+ Just name -> returnRn 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 ->
+ 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?
+-- module A
+-- import M( f )
+-- f :: Int -> Int
+-- f x = x
+-- It's clear that the 'f' in the signature must refer to A.f
+-- The Haskell98 report does not stipulate this, but it will!
+-- So we must treat the 'f' in the signature in the same way
+-- as the binding occurrence of 'f', using lookupBndrRn
+lookupSigOccRn :: RdrName -> RnMS Name
+lookupSigOccRn = lookupBndrRn
+
+-- lookupInstDeclBndr is used for the binders in an
+-- instance declaration. Here we use the class name to
+-- disambiguate.
+
+lookupInstDeclBndr :: Name -> RdrName -> RnMS Name
+ -- We use the selector name as the binder
+lookupInstDeclBndr cls_name rdr_name
+ | isOrig rdr_name -- Occurs in derived instances, where we just
+ -- refer diectly to the right method
+ = lookupOrigName rdr_name
+
+ | otherwise
+ = getGlobalAvails `thenRn` \ avail_env ->
+ case lookupNameEnv avail_env cls_name of
+ -- The class itself isn't in scope, so cls_name is unboundName
+ -- e.g. import Prelude hiding( Ord )
+ -- instance Ord T where ...
+ -- The program is wrong, but that should not cause a crash.
+ Nothing -> returnRn (mkUnboundName rdr_name)
+ Just (AvailTC _ ns) -> case [n | n <- ns, nameOccName n == occ] of
+ (n:ns)-> ASSERT( null ns ) returnRn n
+ [] -> failWithRn (mkUnboundName rdr_name)
+ (unknownNameErr rdr_name)
+ other -> pprPanic "lookupInstDeclBndr" (ppr cls_name)
where
- update name cache = addToFM_C update_prov cache key name
- where
- key = (moduleName (nameModule name), nameOccName name)
+ occ = rdrNameOcc rdr_name
- update_prov name_in_cache name_with_prov
- = setNameProvenance name_in_cache (getNameProvenance name_with_prov)
-
+-- lookupOccRn looks up an occurrence of a RdrName
+lookupOccRn :: RdrName -> RnMS Name
+lookupOccRn rdr_name
+ = getLocalNameEnv `thenRn` \ local_env ->
+ case lookupRdrEnv local_env rdr_name of
+ Just name -> returnRn name
+ Nothing -> lookupGlobalOccRn rdr_name
+-- lookupGlobalOccRn is like lookupOccRn, except that it looks in the global
+-- environment. It's used only for
+-- record field names
+-- class op names in class and instance decls
+
+lookupGlobalOccRn rdr_name
+ = getModeRn `thenRn` \ mode ->
+ if (isInterfaceMode mode)
+ then lookupIfaceName rdr_name
+ else
-mkImportedGlobalFromRdrName :: RdrName -> RnM d Name
-mkImportedGlobalFromRdrName rdr_name
- | isQual rdr_name
- = mkImportedGlobalName (rdrNameModule rdr_name) (rdrNameOcc 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
+lookupSrcName global_env rdr_name
+ | isOrig rdr_name -- Can occur in source code too
+ = lookupOrigName rdr_name
| otherwise
- = -- An Unqual is allowed; interface files contain
+ = 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_name ->
- mkImportedGlobalName mod_name (rdrNameOcc rdr_name)
+ 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}
-getIPName rdr_name
- = getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- case lookupFM ipcache key of
- Just name -> returnRn name
- Nothing -> setNameSupplyRn (us', inst_ns, cache, new_ipcache) `thenRn_`
- returnRn name
- where
- (us', us1) = splitUniqSupply us
- uniq = uniqFromSupply us1
- name = mkIPName uniq key
- new_ipcache = addToFM ipcache key name
- where key = (rdrNameOcc rdr_name)
+@lookupOrigName@ takes an RdrName representing an {\em original}
+name, and adds it to the occurrence pool so that it'll be loaded
+later. This is used when language constructs (such as monad
+comprehensions, overloaded literals, or deriving clauses) require some
+stuff to be loaded that isn't explicitly mentioned in the code.
+
+This doesn't apply in interface mode, where everything is explicit,
+but we don't check for this case: it does no harm to record an
+``extra'' occurrence and @lookupOrigNames@ isn't used much in
+interface mode (it's only the @Nothing@ clause of @rnDerivs@ that
+calls it at all I think).
+
+ \fbox{{\em Jan 98: this comment is wrong: @rnHsType@ uses it quite a bit.}}
+
+\begin{code}
+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.
+
+\begin{code}
+lookupSysBinder rdr_name
+ = ASSERT( isUnqual rdr_name )
+ getModuleRn `thenRn` \ mod ->
+ getSrcLocRn `thenRn` \ loc ->
+ newTopBinder mod rdr_name loc
\end{code}
+
%*********************************************************
%* *
-\subsection{Dfuns and default methods}
+\subsection{Implicit free vars and sugar names}
%* *
%*********************************************************
-@newImplicitBinder@ is used for (a) dfuns
-(b) default methods, defined in this module.
+@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}
-newImplicitBinder occ src_loc
- = getModuleRn `thenRn` \ mod_name ->
- newLocalTopBinder (mkThisModule mod_name) occ (\_ -> Exported) src_loc
-\end{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 decls -- Compiling a module
+ = lookupOrigNames deriv_occs `thenRn` \ deriving_names ->
+ returnRn (deriving_names `plusFV` ubiquitousNames)
+ where
+ -- deriv_classes is now a list of HsTypes, so a "normal" one
+ -- appears as a (HsClassP c []). The non-normal ones for the new
+ -- newtype-deriving extension, and they don't require any
+ -- implicit names, so we can silently filter them out.
+ deriv_occs = [occ | TyClD (TyData {tcdDerivs = Just deriv_classes}) <- decls,
+ HsClassP 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!)
+ `plusFV`
+ namesNeededForFlattening
+ -- this will be empty unless flattening is activated
+
+checkMain ghci_mode mod_name gbl_env
+ -- LOOKUP main IF WE'RE IN MODULE Main
+ -- The main point of this is to drag in the declaration for 'main',
+ -- its in another module, and for the Prelude function 'runMain',
+ -- so that the type checker will find them
+ --
+ -- We have to return the main_name separately, because it's a
+ -- bona fide 'use', and should be recorded as such, but the others
+ -- aren't
+ | mod_name /= mAIN_Name
+ = returnRn (Nothing, emptyFVs, emptyFVs)
-Make a name for the dict fun for an instance decl
+ | not (main_RDR_Unqual `elemRdrEnv` gbl_env)
+ = complain_no_main `thenRn_`
+ returnRn (Nothing, emptyFVs, emptyFVs)
+
+ | otherwise
+ = lookupSrcName gbl_env main_RDR_Unqual `thenRn` \ main_name ->
+ returnRn (Just main_name, unitFV main_name, unitFV runMainName)
-\begin{code}
-newDFunName :: (OccName, OccName) -> SrcLoc -> RnMS Name
-newDFunName key@(cl_occ, tycon_occ) loc
- = newInstUniq string `thenRn` \ inst_uniq ->
- newImplicitBinder (mkDFunOcc string inst_uniq) loc
where
- -- Any string that is somewhat unique will do
- string = occNameString cl_occ ++ occNameString tycon_occ
+ complain_no_main | ghci_mode == Interactive = addWarnRn noMainMsg
+ | otherwise = addErrRn noMainMsg
+ -- In interactive mode, only warn about the absence of main
\end{code}
+%************************************************************************
+%* *
+\subsection{Re-bindable desugaring names}
+%* *
+%************************************************************************
+
+Haskell 98 says that when you say "3" you get the "fromInteger" from the
+Standard Prelude, regardless of what is in scope. However, to experiment
+with having a language that is less coupled to the standard prelude, we're
+trying a non-standard extension that instead gives you whatever "Prelude.fromInteger"
+happens to be in scope. Then you can
+ import Prelude ()
+ import MyPrelude as Prelude
+to get the desired effect.
+
+At the moment this just happens for
+ * fromInteger, fromRational on literals (in expressions and patterns)
+ * negate (in expressions)
+ * minus (arising from n+k patterns)
+
+We store the relevant Name in the HsSyn tree, in
+ * HsIntegral/HsFractional
+ * NegApp
+ * NPlusKPatIn
+respectively. Initially, we just store the "standard" name (PrelNames.fromIntegralName,
+fromRationalName etc), but the renamer changes this to the appropriate user
+name if Opt_NoImplicitPrelude is on. That is what lookupSyntaxName does.
+
\begin{code}
-getDFunKey :: RenamedHsType -> (OccName, OccName) -- Used to manufacture DFun names
-getDFunKey (HsForAllTy _ _ ty) = getDFunKey ty
-getDFunKey (MonoFunTy _ ty) = getDFunKey ty
-getDFunKey (MonoDictTy cls (ty:_)) = (nameOccName cls, get_tycon_key ty)
-
-get_tycon_key (MonoTyVar tv) = nameOccName (getName tv)
-get_tycon_key (MonoTyApp ty _) = get_tycon_key ty
-get_tycon_key (MonoTupleTy tys True) = getOccName (tupleTyCon (length tys))
-get_tycon_key (MonoTupleTy tys False) = getOccName (unboxedTupleTyCon (length tys))
-get_tycon_key (MonoListTy _) = getOccName listTyCon
-get_tycon_key (MonoFunTy _ _) = getOccName funTyCon
+lookupSyntaxName :: Name -- The standard name
+ -> RnMS Name -- Possibly a non-standard name
+lookupSyntaxName std_name
+ = doptRn Opt_NoImplicitPrelude `thenRn` \ no_prelude ->
+ if not no_prelude then
+ returnRn std_name -- Normal case
+ else
+ let
+ rdr_name = mkRdrUnqual (nameOccName std_name)
+ -- Get the similarly named thing from the local environment
+ in
+ lookupOccRn rdr_name
\end{code}
%*********************************************************
\begin{code}
--------------------------------------
+newLocalsRn :: [(RdrName,SrcLoc)]
+ -> RnMS [Name]
+newLocalsRn rdr_names_w_loc
+ = getNameSupplyRn `thenRn` \ name_supply ->
+ let
+ (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 (name_supply {nsUniqs = us'}) `thenRn_`
+ returnRn names
+
+
bindLocatedLocalsRn :: SDoc -- Documentation string for error message
-> [(RdrName,SrcLoc)]
-> ([Name] -> RnMS a)
-> RnMS a
bindLocatedLocalsRn doc_str rdr_names_w_loc enclosed_scope
- = checkDupOrQualNames doc_str rdr_names_w_loc `thenRn_`
+ = getModeRn `thenRn` \ mode ->
+ getLocalNameEnv `thenRn` \ local_env ->
+ getGlobalNameEnv `thenRn` \ global_env ->
- getLocalNameEnv `thenRn` \ name_env ->
- (if opt_WarnNameShadowing
- then
- mapRn_ (check_shadow name_env) rdr_names_w_loc
- else
- returnRn ()
- ) `thenRn_`
-
- getNameSupplyRn `thenRn` \ (us, inst_ns, cache, ipcache) ->
- getModeRn `thenRn` \ mode ->
+ -- Check for duplicate names
+ checkDupOrQualNames doc_str rdr_names_w_loc `thenRn_`
+
+ -- Warn about shadowing, but only in source modules
let
- n = length rdr_names_w_loc
- (us', us1) = splitUniqSupply us
- uniqs = uniqsFromSupply n us1
- names = [ mk_name uniq (rdrNameOcc rdr_name) loc
- | ((rdr_name,loc), uniq) <- rdr_names_w_loc `zip` uniqs
- ]
- mk_name = case mode of
- SourceMode -> mkLocalName
- InterfaceMode -> mkImportedLocalName
- -- Keep track of whether the name originally came from
- -- an interface file.
+ check_shadow (rdr_name,loc)
+ | rdr_name `elemRdrEnv` local_env
+ || rdr_name `elemRdrEnv` global_env
+ = pushSrcLocRn loc $ addWarnRn (shadowedNameWarn rdr_name)
+ | otherwise
+ = returnRn ()
in
- setNameSupplyRn (us', inst_ns, cache, ipcache) `thenRn_`
+ (case mode of
+ SourceMode -> ifOptRn Opt_WarnNameShadowing $
+ mapRn_ check_shadow rdr_names_w_loc
+ other -> returnRn ()
+ ) `thenRn_`
+
+ newLocalsRn rdr_names_w_loc `thenRn` \ names ->
let
- new_name_env = addListToRdrEnv name_env (map fst rdr_names_w_loc `zip` names)
+ new_local_env = addListToRdrEnv local_env (map fst rdr_names_w_loc `zip` names)
in
- setLocalNameEnv new_name_env (enclosed_scope names)
+ setLocalNameEnv new_local_env (enclosed_scope names)
- where
- check_shadow name_env (rdr_name,loc)
- = case lookupRdrEnv name_env rdr_name of
- Nothing -> returnRn ()
- 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, inst_ns, 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', inst_ns, 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)
+
+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 (extendLocalRdrEnv name_env names)
+ enclosed_scope
+
+bindLocalNamesFV names enclosed_scope
+ = bindLocalNames names $
+ enclosed_scope `thenRn` \ (thing, fvs) ->
+ returnRn (thing, delListFromNameSet fvs names)
-bindCoreLocalsFVRn [] thing_inside = thing_inside []
-bindCoreLocalsFVRn (b:bs) thing_inside = bindCoreLocalFVRn b $ \ name' ->
- bindCoreLocalsFVRn bs $ \ names' ->
- thing_inside (name':names')
-------------------------------------
bindLocalRn doc rdr_name enclosed_scope
returnRn (thing, delListFromNameSet fvs names)
-------------------------------------
-bindUVarRn :: SDoc -> RdrName -> (Name -> RnMS (a, FreeVars)) -> RnMS (a, FreeVars)
-bindUVarRn = bindLocalRn
-
--------------------------------------
-extendTyVarEnvFVRn :: [HsTyVar Name] -> RnMS (a, FreeVars) -> RnMS (a, FreeVars)
- -- This tiresome function is used only in rnDecl on InstDecl
+extendTyVarEnvFVRn :: [Name] -> RnMS (a, FreeVars) -> RnMS (a, FreeVars)
+ -- This tiresome function is used only in rnSourceDecl on InstDecl
extendTyVarEnvFVRn tyvars enclosed_scope
- = getLocalNameEnv `thenRn` \ env ->
- let
- tyvar_names = map getTyVarName tyvars
- new_env = addListToRdrEnv env [ (mkRdrUnqual (getOccName name), name)
- | name <- tyvar_names
- ]
- in
- setLocalNameEnv new_env enclosed_scope `thenRn` \ (thing, fvs) ->
- returnRn (thing, delListFromNameSet fvs tyvar_names)
+ = bindLocalNames tyvars enclosed_scope `thenRn` \ (thing, fvs) ->
+ returnRn (thing, delListFromNameSet fvs tyvars)
-bindTyVarsRn :: SDoc -> [HsTyVar RdrName]
- -> ([HsTyVar Name] -> RnMS a)
+bindTyVarsRn :: SDoc -> [HsTyVarBndr RdrName]
+ -> ([HsTyVarBndr Name] -> RnMS a)
-> RnMS a
bindTyVarsRn doc_str tyvar_names enclosed_scope
- = bindTyVars2Rn doc_str tyvar_names $ \ names tyvars ->
- enclosed_scope tyvars
-
--- Gruesome name: return Names as well as HsTyVars
-bindTyVars2Rn :: SDoc -> [HsTyVar RdrName]
- -> ([Name] -> [HsTyVar Name] -> RnMS a)
- -> RnMS a
-bindTyVars2Rn doc_str tyvar_names enclosed_scope
= getSrcLocRn `thenRn` \ loc ->
let
- located_tyvars = [(getTyVarName tv, loc) | tv <- tyvar_names]
+ located_tyvars = [(hsTyVarName tv, loc) | tv <- tyvar_names]
in
bindLocatedLocalsRn doc_str located_tyvars $ \ names ->
- enclosed_scope names (zipWith replaceTyVarName tyvar_names names)
-
-bindTyVarsFVRn :: SDoc -> [HsTyVar RdrName]
- -> ([HsTyVar Name] -> RnMS (a, FreeVars))
- -> RnMS (a, FreeVars)
-bindTyVarsFVRn doc_str rdr_names enclosed_scope
- = bindTyVars2Rn doc_str rdr_names $ \ names tyvars ->
- enclosed_scope tyvars `thenRn` \ (thing, fvs) ->
- returnRn (thing, delListFromNameSet fvs names)
+ enclosed_scope (zipWith replaceTyVarName tyvar_names names)
+
+bindPatSigTyVars :: [RdrNameHsType]
+ -> RnMS (a, FreeVars)
+ -> RnMS (a, FreeVars)
+ -- Find the type variables in the pattern type
+ -- signatures that must be brought into scope
-bindTyVarsFV2Rn :: SDoc -> [HsTyVar RdrName]
- -> ([Name] -> [HsTyVar Name] -> RnMS (a, FreeVars))
- -> RnMS (a, FreeVars)
-bindTyVarsFV2Rn doc_str rdr_names enclosed_scope
- = bindTyVars2Rn doc_str rdr_names $ \ names tyvars ->
- enclosed_scope names tyvars `thenRn` \ (thing, fvs) ->
+bindPatSigTyVars tys enclosed_scope
+ = getLocalNameEnv `thenRn` \ name_env ->
+ getSrcLocRn `thenRn` \ loc ->
+ let
+ forall_tyvars = nub [ tv | ty <- tys,
+ tv <- extractHsTyRdrTyVars ty,
+ not (tv `elemFM` name_env)
+ ]
+ -- The 'nub' is important. For example:
+ -- f (x :: t) (y :: t) = ....
+ -- We don't want to complain about binding t twice!
+
+ located_tyvars = [(tv, loc) | tv <- forall_tyvars]
+ doc_sig = text "In a pattern type-signature"
+ in
+ bindLocatedLocalsRn doc_sig located_tyvars $ \ names ->
+ enclosed_scope `thenRn` \ (thing, fvs) ->
returnRn (thing, delListFromNameSet fvs names)
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
\end{code}
-%*********************************************************
-%* *
-\subsection{Looking up names}
-%* *
-%*********************************************************
-
-Looking up a name in the RnEnv.
-
-\begin{code}
-lookupBndrRn rdr_name
- = getNameEnvs `thenRn` \ (global_env, local_env) ->
-
- -- Try local env
- case lookupRdrEnv local_env rdr_name of {
- Just name -> returnRn name ;
- Nothing ->
-
- getModeRn `thenRn` \ mode ->
- case mode of
- InterfaceMode -> -- Look in the global name cache
- mkImportedGlobalFromRdrName 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 ->
- case lookupRdrEnv global_env (qualifyRdrName mod rdr_name) of
- Just (name:rest) -> ASSERT( null rest )
- returnRn name
- Nothing -> pprPanic "lookupBndrRn" (ppr mod <+> ppr rdr_name)
- }
-
--- Just like lookupRn except that we record the occurrence too
--- Perhaps surprisingly, even wired-in names are recorded.
--- Why? So that we know which wired-in names are referred to when
--- deciding which instance declarations to import.
-lookupOccRn :: RdrName -> RnMS Name
-lookupOccRn rdr_name
- = getNameEnvs `thenRn` \ (global_env, local_env) ->
- lookup_occ global_env local_env rdr_name
-
--- lookupGlobalOccRn is like lookupOccRn, except that it looks in the global
--- environment. It's used only for
--- record field names
--- class op names in class and instance decls
-lookupGlobalOccRn :: RdrName -> RnMS Name
-lookupGlobalOccRn rdr_name
- = getNameEnvs `thenRn` \ (global_env, local_env) ->
- lookup_global_occ global_env rdr_name
-
--- Look in both local and global env
-lookup_occ global_env local_env rdr_name
- = case lookupRdrEnv local_env rdr_name of
- Just name -> returnRn name
- Nothing -> lookup_global_occ global_env rdr_name
-
--- Look in global env only
-lookup_global_occ global_env rdr_name
- = case lookupRdrEnv global_env rdr_name of
- Just [name] -> returnRn name
- Just stuff@(name:_) -> addNameClashErrRn rdr_name stuff `thenRn_`
- returnRn name
- Nothing -> getModeRn `thenRn` \ mode ->
- case mode of
- -- Not found when processing source code; so fail
- SourceMode -> failWithRn (mkUnboundName rdr_name)
- (unknownNameErr rdr_name)
-
- -- Not found when processing an imported declaration,
- -- so we create a new name for the purpose
- InterfaceMode -> mkImportedGlobalFromRdrName rdr_name
-\end{code}
-%
-@lookupImplicitOccRn@ takes an RdrName representing an {\em original} name,
-and adds it to the occurrence pool so that it'll be loaded later.
-This is used when language constructs
-(such as monad comprehensions, overloaded literals, or deriving clauses)
-require some stuff to be loaded that isn't explicitly mentioned in the code.
-
-This doesn't apply in interface mode, where everything is explicit,
-but we don't check for this case:
-it does no harm to record an ``extra'' occurrence
-and @lookupImplicitOccRn@ isn't used much in interface mode
-(it's only the @Nothing@ clause of @rnDerivs@ that 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}
-lookupImplicitOccRn :: RdrName -> RnM d Name
-lookupImplicitOccRn rdr_name = mkImportedGlobalFromRdrName rdr_name
-\end{code}
-
-@unQualInScope@ returns a function that takes a @Name@ and tells whether
-its unqualified name is in scope. This is put as a boolean flag in
-the @Name@'s provenance to guide whether or not to print the name qualified
-in error messages.
-
-\begin{code}
-unQualInScope :: GlobalRdrEnv -> Name -> Bool
-unQualInScope env
- = lookup
- where
- lookup name = case lookupRdrEnv env (mkRdrUnqual (nameOccName name)) of
- Just [name'] -> name == name'
- other -> False
-\end{code}
-
%************************************************************************
%* *
-\subsection{Envt utility functions}
+\subsection{GlobalRdrEnv}
%* *
%************************************************************************
-\subsubsection{NameEnv}% ================
+\begin{code}
+mkGlobalRdrEnv :: ModuleName -- Imported module (after doing the "as M" name change)
+ -> Bool -- True <=> want unqualified import
+ -> (Name -> Provenance)
+ -> Avails -- Whats imported
+ -> Deprecations
+ -> GlobalRdrEnv
+
+mkGlobalRdrEnv this_mod unqual_imp 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 qualified names for the things that are available
+ -- (Qualified names are always imported)
+ gbl_env1 = foldl add_avail emptyRdrEnv avails
+
+ -- Add unqualified names
+ gbl_env2 | unqual_imp = foldl add_unqual gbl_env1 (rdrEnvToList gbl_env1)
+ | otherwise = gbl_env1
+
+ 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.
+
+ add_avail :: GlobalRdrEnv -> AvailInfo -> GlobalRdrEnv
+ add_avail env avail = foldl add_name env (availNames avail)
+
+ add_name env name -- Add qualified name only
+ = addOneToGlobalRdrEnv env (mkRdrQual this_mod occ) elt
+ where
+ occ = nameOccName name
+ elt = GRE name (mk_provenance name) (lookupDeprec deprecs name)
+\end{code}
\begin{code}
plusGlobalRdrEnv :: GlobalRdrEnv -> GlobalRdrEnv -> GlobalRdrEnv
plusGlobalRdrEnv env1 env2 = plusFM_C combine_globals env1 env2
-addOneToGlobalRdrEnv :: GlobalRdrEnv -> RdrName -> Name -> 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] -- Old
- -> [Name] -- New
- -> [Name]
+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
- add n ns | any (is_duplicate n) ns_old = map choose ns -- Eliminate duplicates
+ add n ns | any (is_duplicate n) ns_old = map (choose n) ns -- Eliminate duplicates
| otherwise = n:ns
- where
- choose n' | n==n' && better_provenance n n' = n
- | otherwise = n'
-
--- Choose
--- a local thing over an imported thing
--- a user-imported thing over a non-user-imported thing
--- an explicitly-imported thing over an implicitly imported thing
-better_provenance n1 n2
- = case (getNameProvenance n1, getNameProvenance n2) of
- (LocalDef _ _, _ ) -> True
- (NonLocalDef (UserImport _ _ True) _, _ ) -> True
- (NonLocalDef (UserImport _ _ _ ) _, NonLocalDef ImplicitImport _) -> True
- other -> False
-
-is_duplicate :: Name -> Name -> Bool
-is_duplicate n1 n2 | isLocallyDefined n1 && isLocallyDefined n2 = False
- | otherwise = n1 == n2
+
+ choose n m | n `beats` m = n
+ | otherwise = m
+
+ (GRE n pn _) `beats` (GRE m pm _) = n==m && pn `hasBetterProv` pm
+
+ 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,
because they might be two separate, local defns and we want to report
and error for that, {\em not} eliminate a duplicate.
On the other hand, if you import the same name from two different
-import statements, we {\em d}* want to eliminate the duplicate, not report
+import statements, we {\em do} want to eliminate the duplicate, not report
an error.
If a module imports itself then there might be a local defn and an imported
will still have different provenances.
+@unQualInScope@ returns a function that takes a @Name@ and tells whether
+its unqualified name is in scope. This is put as a boolean flag in
+the @Name@'s provenance to guide whether or not to print the name qualified
+in error messages.
+
+\begin{code}
+unQualInScope :: GlobalRdrEnv -> Name -> Bool
+-- True if 'f' is in scope, and has only one binding,
+-- and the thing it is bound to is the name we are looking for
+-- (i.e. false if A.f and B.f are both in scope as unqualified 'f')
+--
+-- This fn is only efficient if the shared
+-- partial application is used a lot.
+unQualInScope env
+ = (`elemNameSet` unqual_names)
+ where
+ 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}
-\subsubsection{AvailInfo}% ================
+
+%************************************************************************
+%* *
+\subsection{Avails}
+%* *
+%************************************************************************
\begin{code}
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
-addAvail avails avail = addToNameEnv_C plusAvail avails (availName avail) avail
+addAvail avails avail = extendNameEnv_C plusAvail avails (availName avail) avail
-emptyAvailEnv = emptyNameEnv
unitAvailEnv :: AvailInfo -> AvailEnv
unitAvailEnv a = unitNameEnv (availName a) a
availsToNameSet :: [AvailInfo] -> NameSet
availsToNameSet avails = foldl addAvailToNameSet emptyNameSet avails
-availName :: AvailInfo -> Name
+availName :: GenAvailInfo name -> name
availName (Avail n) = n
availName (AvailTC n _) = n
-availNames :: AvailInfo -> [Name]
+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)
-
+-------------------------------------
filterAvail :: RdrNameIE -- Wanted
-> AvailInfo -- Available
-> Maybe AvailInfo -- Resulting available;
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}
-
-
+\begin{code}
+pruneAvails :: (Name -> Bool) -- Keep if this is True
+ -> [AvailInfo]
+ -> [AvailInfo]
+pruneAvails keep avails
+ = mapMaybe del avails
+ where
+ del :: AvailInfo -> Maybe AvailInfo -- Nothing => nothing left!
+ del (Avail n) | keep n = Just (Avail n)
+ | otherwise = Nothing
+ del (AvailTC n ns) | null ns' = Nothing
+ | otherwise = Just (AvailTC n ns')
+ where
+ ns' = filter keep ns
+\end{code}
%************************************************************************
%* *
%************************************************************************
\begin{code}
-type FreeVars = NameSet
-
-plusFV :: FreeVars -> FreeVars -> FreeVars
-addOneFV :: FreeVars -> Name -> FreeVars
-unitFV :: Name -> FreeVars
-emptyFVs :: FreeVars
-plusFVs :: [FreeVars] -> FreeVars
-
-isEmptyFVs = isEmptyNameSet
-emptyFVs = emptyNameSet
-plusFVs = unionManyNameSets
-plusFV = unionNameSets
-
--- 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
%* *
%************************************************************************
-
-
\begin{code}
warnUnusedModules :: [ModuleName] -> RnM d ()
warnUnusedModules mods
- | not opt_WarnUnusedImports = returnRn ()
- | otherwise = mapRn_ (addWarnRn . unused_mod) mods
+ = ifOptRn Opt_WarnUnusedImports (mapRn_ (addWarnRn . unused_mod) mods)
where
- unused_mod m = ptext SLIT("Module") <+> quotes (pprModuleName m) <+>
- ptext SLIT("is imported, but nothing from it is used")
+ 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 m))]
-warnUnusedLocalBinds, warnUnusedImports, warnUnusedMatches :: [Name] -> RnM d ()
+warnUnusedImports :: [(Name,Provenance)] -> RnM d ()
warnUnusedImports names
- | not opt_WarnUnusedImports
- = returnRn () -- Don't force names unless necessary
- | otherwise
- = warnUnusedBinds (const True) names
+ = ifOptRn Opt_WarnUnusedImports (warnUnusedBinds names)
-warnUnusedLocalBinds ns
- | not opt_WarnUnusedBinds = returnRn ()
- | otherwise = warnUnusedBinds (const True) ns
+warnUnusedLocalBinds, warnUnusedMatches :: [Name] -> RnM d ()
+warnUnusedLocalBinds names
+ = ifOptRn Opt_WarnUnusedBinds (warnUnusedBinds [(n,LocalDef) | n<-names])
warnUnusedMatches names
- | opt_WarnUnusedMatches = warnUnusedGroup (const True) names
- | otherwise = returnRn ()
+ = ifOptRn Opt_WarnUnusedMatches (warnUnusedGroup [(n,LocalDef) | n<-names])
-------------------------
-warnUnusedBinds :: (Bool -> Bool) -> [Name] -> RnM d ()
-warnUnusedBinds warn_when_local names
- = mapRn_ (warnUnusedGroup warn_when_local) groups
+warnUnusedBinds :: [(Name,Provenance)] -> RnM d ()
+warnUnusedBinds names
+ = mapRn_ warnUnusedGroup groups
where
-- Group by provenance
groups = equivClasses cmp names
- name1 `cmp` name2 = getNameProvenance name1 `cmp_prov` getNameProvenance name2
+ (_,prov1) `cmp` (_,prov2) = prov1 `compare` prov2
- cmp_prov (LocalDef _ _) (NonLocalDef _ _) = LT
- cmp_prov (LocalDef loc1 _) (LocalDef loc2 _) = loc1 `compare` loc2
- cmp_prov (NonLocalDef (UserImport m1 loc1 _) _)
- (NonLocalDef (UserImport m2 loc2 _) _) =
- (m1 `compare` m2) `thenCmp` (loc1 `compare` loc2)
- cmp_prov (NonLocalDef _ _) (LocalDef _ _) = GT
- -- In-scope NonLocalDefs must have UserImport info on them
-------------------------
--- NOTE: the function passed to warnUnusedGroup is
--- now always (const True) so we should be able to
--- simplify the code slightly. I'm leaving it there
--- for now just in case I havn't realised why it was there.
--- Looks highly bogus to me. SLPJ Dec 99
-
-warnUnusedGroup :: (Bool -> Bool) -> [Name] -> RnM d ()
-warnUnusedGroup emit_warning names
- | null filtered_names = returnRn ()
- | not (emit_warning is_local) = returnRn ()
+warnUnusedGroup :: [(Name,Provenance)] -> RnM d ()
+warnUnusedGroup names
+ | null filtered_names = returnRn ()
+ | not is_local = returnRn ()
| otherwise
= pushSrcLocRn def_loc $
addWarnRn $
- sep [msg <> colon, nest 4 (fsep (punctuate comma (map ppr filtered_names)))]
+ sep [msg <> colon, nest 4 (fsep (punctuate comma (map (ppr.fst) filtered_names)))]
where
filtered_names = filter reportable names
- name1 = head filtered_names
+ (name1, prov1) = head filtered_names
(is_local, def_loc, msg)
- = case getNameProvenance name1 of
- LocalDef loc _ -> (True, loc, text "Defined but not used")
- NonLocalDef (UserImport mod loc _) _ ->
- (True, loc, text "Imported from" <+> quotes (ppr mod) <+>
- text "but not used")
- other -> (False, getSrcLoc name1, text "Strangely defined but not used")
-
- reportable name = case occNameUserString (nameOccName name) of
- ('_' : _) -> False
- zz_other -> True
+ = case prov1 of
+ LocalDef -> (True, getSrcLoc name1, text "Defined but not used")
+
+ NonLocalDef (UserImport mod loc _)
+ -> (True, loc, text "Imported from" <+> quotes (ppr mod) <+> text "but not used")
+
+ reportable (name,_) = case occNameUserString (nameOccName name) of
+ ('_' : _) -> False
+ zz_other -> True
-- Haskell 98 encourages compilers to suppress warnings about
-- unused names in a pattern if they start with "_".
\end{code}
\begin{code}
-addNameClashErrRn rdr_name (name1:names)
+addNameClashErrRn rdr_name (np1:nps)
= addErrRn (vcat [ptext SLIT("Ambiguous occurrence") <+> quotes (ppr rdr_name),
ptext SLIT("It could refer to") <+> vcat (msg1 : msgs)])
where
- msg1 = ptext SLIT("either") <+> mk_ref name1
- msgs = [ptext SLIT(" or") <+> mk_ref name | name <- names]
- mk_ref name = quotes (ppr name) <> comma <+> pprNameProvenance name
-
-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])
+ msg1 = ptext SLIT("either") <+> mk_ref np1
+ msgs = [ptext SLIT(" or") <+> mk_ref np | np <- nps]
+ mk_ref (GRE name prov _) = quotes (ppr name) <> comma <+> pprNameProvenance name prov
shadowedNameWarn shadow
= hsep [ptext SLIT("This binding for"),
quotes (ppr shadow),
ptext SLIT("shadows an existing binding")]
+noMainMsg = ptext SLIT("No 'main' defined in module Main")
+
unknownNameErr name
= sep [text flavour, ptext SLIT("not in scope:"), quotes (ppr name)]
where
qualNameErr descriptor (name,loc)
= pushSrcLocRn loc $
- addErrRn (hsep [ ptext SLIT("Invalid use of qualified name"),
- quotes (ppr name),
- ptext SLIT("in"),
+ addErrRn (vcat [ ptext SLIT("Invalid use of qualified name") <+> quotes (ppr name),
descriptor])
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}
+
projects / ghc-hetmet.git / blobdiff