%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[RnBinds]{Renaming and dependency analysis of bindings}
\begin{code}
module RnBinds (
rnTopBinds, rnTopMonoBinds,
- rnMethodBinds,
- rnBinds, rnMonoBinds
+ rnMethodBinds, renameSigs, renameSigsFVs,
+ rnBinds,
+ unknownSigErr
) where
#include "HsVersions.h"
-import {-# SOURCE #-} RnSource ( rnHsSigType )
+import {-# SOURCE #-} RnSource ( rnHsSigType, rnHsType )
import HsSyn
+import HsBinds ( eqHsSig, sigName, hsSigDoc )
import RdrHsSyn
import RnHsSyn
import RnMonad
-import RnExpr ( rnMatch, rnGRHSsAndBinds, rnPat, checkPrecMatch )
-import RnEnv ( bindLocatedLocalsRn, lookupBndrRn, lookupOccRn,
- newLocalNames, isUnboundName, warnUnusedBinds
+import RnExpr ( rnMatch, rnGRHSs, rnPat, checkPrecMatch )
+import RnEnv ( bindLocatedLocalsRn, lookupBndrRn,
+ lookupGlobalOccRn, lookupSigOccRn,
+ warnUnusedLocalBinds, mapFvRn, extendTyVarEnvFVRn,
)
-import CmdLineOpts ( opt_SigsRequired )
+import CmdLineOpts ( DynFlag(..) )
import Digraph ( stronglyConnComp, SCC(..) )
-import Name ( OccName(..), Provenance,
- Name, isExportedName,
- NameSet(..), emptyNameSet, mkNameSet, unionNameSets,
- minusNameSet, unionManyNameSets, elemNameSet, unitNameSet, nameSetToList
- )
-import BasicTypes ( RecFlag(..), TopLevelFlag(..) )
-import Util ( thenCmp, removeDups, panic, panic#, assertPanic )
-import UniqSet ( UniqSet )
-import ListSetOps ( minusList )
-import Bag ( bagToList )
-import UniqFM ( UniqFM )
+import Name ( OccName, Name, nameOccName, nameSrcLoc )
+import NameSet
+import RdrName ( RdrName, rdrNameOcc )
+import BasicTypes ( RecFlag(..) )
+import List ( partition )
import Outputable
+import PrelNames ( isUnboundName )
\end{code}
-- ToDo: Put the annotations into the monad, so that they arrive in the proper
%************************************************************************
%* *
-%* Top-level bindings
+\subsubsection{ Top-level bindings}
%* *
%************************************************************************
contains bindings for the binders of this particular binding.
\begin{code}
-rnTopBinds :: RdrNameHsBinds -> RnMS s RenamedHsBinds
+rnTopBinds :: RdrNameHsBinds -> RnMS (RenamedHsBinds, FreeVars)
-rnTopBinds EmptyBinds = returnRn EmptyBinds
+rnTopBinds EmptyBinds = returnRn (EmptyBinds, emptyFVs)
rnTopBinds (MonoBind bind sigs _) = rnTopMonoBinds bind sigs
-- The parser doesn't produce other forms
-rnTopMonoBinds EmptyMonoBinds sigs
- = returnRn EmptyBinds
-
rnTopMonoBinds mbinds sigs
- = mapRn lookupBndrRn binder_rdr_names `thenRn` \ binder_names ->
+ = mapRn lookupBndrRn binder_rdr_names `thenRn` \ binder_names ->
let
- binder_set = mkNameSet binder_names
- exported_binders = mkNameSet (filter isExportedName binder_names)
+ bndr_name_set = mkNameSet binder_names
in
- rn_mono_binds TopLevel
- binder_set mbinds sigs `thenRn` \ (new_binds, fv_set) ->
+ renameSigsFVs (okBindSig bndr_name_set) sigs `thenRn` \ (siglist, sig_fvs) ->
+ doptRn Opt_WarnMissingSigs `thenRn` \ warnMissing ->
let
- unused_binders = binder_set `minusNameSet` (fv_set `unionNameSets` exported_binders)
+ type_sig_vars = [n | Sig n _ _ <- siglist]
+ un_sigd_binders | warnMissing = nameSetToList (delListFromNameSet
+ bndr_name_set type_sig_vars)
+ | otherwise = []
in
- warnUnusedBinds unused_binders `thenRn_`
- returnRn new_binds
+ mapRn_ missingSigWarn un_sigd_binders `thenRn_`
+
+ rn_mono_binds siglist mbinds `thenRn` \ (final_binds, bind_fvs) ->
+ returnRn (final_binds, bind_fvs `plusFV` sig_fvs)
where
- binder_rdr_names = map fst (bagToList (collectMonoBinders mbinds))
+ binder_rdr_names = collectMonoBinders mbinds
\end{code}
%************************************************************************
%* *
%************************************************************************
-@rnMonoBinds@
- - collects up the binders for this declaration group,
- - checks that they form a set
- - extends the environment to bind them to new local names
- - calls @rnMonoBinds@ to do the real work
+\subsubsection{Nested binds}
+@rnMonoBinds@
+\begin{itemize}
+\item collects up the binders for this declaration group,
+\item checks that they form a set
+\item extends the environment to bind them to new local names
+\item calls @rnMonoBinds@ to do the real work
+\end{itemize}
+%
\begin{code}
rnBinds :: RdrNameHsBinds
- -> (RenamedHsBinds -> RnMS s (result, FreeVars))
- -> RnMS s (result, FreeVars)
+ -> (RenamedHsBinds -> RnMS (result, FreeVars))
+ -> RnMS (result, FreeVars)
rnBinds EmptyBinds thing_inside = thing_inside EmptyBinds
rnBinds (MonoBind bind sigs _) thing_inside = rnMonoBinds bind sigs thing_inside
-- the parser doesn't produce other forms
-rnMonoBinds :: RdrNameMonoBinds -> [RdrNameSig]
- -> (RenamedHsBinds -> RnMS s (result, FreeVars))
- -> RnMS s (result, FreeVars)
-
-rnMonoBinds EmptyMonoBinds sigs thing_inside = thing_inside EmptyBinds
+rnMonoBinds :: RdrNameMonoBinds
+ -> [RdrNameSig]
+ -> (RenamedHsBinds -> RnMS (result, FreeVars))
+ -> RnMS (result, FreeVars)
rnMonoBinds mbinds sigs thing_inside -- Non-empty monobinds
= -- Extract all the binders in this group,
-- and extend current scope, inventing new names for the new binders
-- This also checks that the names form a set
- bindLocatedLocalsRn (text "binding group") mbinders_w_srclocs $ \ new_mbinders ->
+ bindLocatedLocalsRn (text "a binding group")
+ mbinders_w_srclocs $ \ new_mbinders ->
let
binder_set = mkNameSet new_mbinders
in
- rn_mono_binds NotTopLevel
- binder_set mbinds sigs `thenRn` \ (binds,bind_fvs) ->
+ -- Rename the signatures
+ renameSigsFVs (okBindSig binder_set) sigs `thenRn` \ (siglist, sig_fvs) ->
+
+ -- Report the fixity declarations in this group that
+ -- don't refer to any of the group's binders.
+ -- Then install the fixity declarations that do apply here
+ -- Notice that they scope over thing_inside too
+ let
+ fixity_sigs = [(name,sig) | FixSig sig@(FixitySig name _ _) <- siglist ]
+ in
+ extendFixityEnv fixity_sigs $
+
+ rn_mono_binds siglist mbinds `thenRn` \ (binds, bind_fvs) ->
- -- Now do the "thing inside", and deal with the free-variable calculations
- thing_inside binds `thenRn` \ (result,result_fvs) ->
+ -- Now do the "thing inside", and deal with the free-variable calculations
+ thing_inside binds `thenRn` \ (result,result_fvs) ->
let
- all_fvs = result_fvs `unionNameSets` bind_fvs
- net_fvs = all_fvs `minusNameSet` binder_set
- unused_binders = binder_set `minusNameSet` all_fvs
+ all_fvs = result_fvs `plusFV` bind_fvs `plusFV` sig_fvs
+ unused_binders = nameSetToList (binder_set `minusNameSet` all_fvs)
in
- warnUnusedBinds unused_binders `thenRn_`
- returnRn (result, net_fvs)
+ warnUnusedLocalBinds unused_binders `thenRn_`
+ returnRn (result, delListFromNameSet all_fvs new_mbinders)
where
- mbinders_w_srclocs = bagToList (collectMonoBinders mbinds)
+ mbinders_w_srclocs = collectLocatedMonoBinders mbinds
\end{code}
%************************************************************************
%* *
-%* MonoBinds -- the main work is done here
+\subsubsection{ MonoBinds -- the main work is done here}
%* *
%************************************************************************
-@rnMonoBinds@ is used by *both* top-level and nested bindings. It
-assumes that all variables bound in this group are already in scope.
-This is done *either* by pass 3 (for the top-level bindings), *or* by
-@rnNestedMonoBinds@ (for the nested ones).
+@rn_mono_binds@ is used by {\em both} top-level and nested bindings.
+It assumes that all variables bound in this group are already in scope.
+This is done {\em either} by pass 3 (for the top-level bindings),
+{\em or} by @rnMonoBinds@ (for the nested ones).
\begin{code}
-rn_mono_binds :: TopLevelFlag
- -> NameSet -- Binders of this group
+rn_mono_binds :: [RenamedSig] -- Signatures attached to this group
-> RdrNameMonoBinds
- -> [RdrNameSig] -- Signatures attached to this group
- -> RnMS s (RenamedHsBinds, --
+ -> RnMS (RenamedHsBinds, --
FreeVars) -- Free variables
-rn_mono_binds top_lev binders mbinds sigs
+rn_mono_binds siglist mbinds
=
-- Rename the bindings, returning a MonoBindsInfo
-- which is a list of indivisible vertices so far as
-- the strongly-connected-components (SCC) analysis is concerned
- rnBindSigs top_lev binders sigs `thenRn` \ siglist ->
- flattenMonoBinds siglist mbinds `thenRn` \ mbinds_info ->
+ flattenMonoBinds siglist mbinds `thenRn` \ mbinds_info ->
-- Do the SCC analysis
- let edges = mkEdges (mbinds_info `zip` [(0::Int)..])
+ let
+ edges = mkEdges (mbinds_info `zip` [(0::Int)..])
scc_result = stronglyConnComp edges
- final_binds = foldr1 ThenBinds (map reconstructCycle scc_result)
+ final_binds = foldr (ThenBinds . reconstructCycle) EmptyBinds scc_result
-- Deal with bound and free-var calculation
- rhs_fvs = unionManyNameSets [fvs | (_,fvs,_,_) <- mbinds_info]
+ rhs_fvs = plusFVs [fvs | (_,fvs,_,_) <- mbinds_info]
in
returnRn (final_binds, rhs_fvs)
\end{code}
@flattenMonoBinds@ is ever-so-slightly magical in that it sticks
unique ``vertex tags'' on its output; minor plumbing required.
+Sigh --- need to pass along the signatures for the group of bindings,
+in case any of them \fbox{\ ???\ }
+
\begin{code}
flattenMonoBinds :: [RenamedSig] -- Signatures
-> RdrNameMonoBinds
- -> RnMS s [FlatMonoBindsInfo]
+ -> RnMS [FlatMonoBindsInfo]
flattenMonoBinds sigs EmptyMonoBinds = returnRn []
flattenMonoBinds sigs bs2 `thenRn` \ flat2 ->
returnRn (flat1 ++ flat2)
-flattenMonoBinds sigs (PatMonoBind pat grhss_and_binds locn)
+flattenMonoBinds sigs (PatMonoBind pat grhss locn)
= pushSrcLocRn locn $
- rnPat pat `thenRn` \ pat' ->
- rnGRHSsAndBinds grhss_and_binds `thenRn` \ (grhss_and_binds', fvs) ->
+ rnPat pat `thenRn` \ (pat', pat_fvs) ->
-- Find which things are bound in this group
let
names_bound_here = mkNameSet (collectPatBinders pat')
- sigs_for_me = filter ((`elemNameSet` names_bound_here) . sig_name) sigs
- sigs_fvs = foldr sig_fv emptyNameSet sigs_for_me
in
+ sigsForMe names_bound_here sigs `thenRn` \ sigs_for_me ->
+ rnGRHSs grhss `thenRn` \ (grhss', fvs) ->
returnRn
[(names_bound_here,
- fvs `unionNameSets` sigs_fvs,
- PatMonoBind pat' grhss_and_binds' locn,
+ fvs `plusFV` pat_fvs,
+ PatMonoBind pat' grhss' locn,
sigs_for_me
)]
flattenMonoBinds sigs (FunMonoBind name inf matches locn)
- = pushSrcLocRn locn $
- mapRn (checkPrecMatch inf name) matches `thenRn_`
- lookupBndrRn name `thenRn` \ name' ->
- mapAndUnzipRn rnMatch matches `thenRn` \ (new_matches, fv_lists) ->
+ = pushSrcLocRn locn $
+ lookupBndrRn name `thenRn` \ new_name ->
let
- fvs = unionManyNameSets fv_lists
- sigs_for_me = filter ((name' ==) . sig_name) sigs
- sigs_fvs = foldr sig_fv emptyNameSet sigs_for_me
+ names_bound_here = unitNameSet new_name
in
+ sigsForMe names_bound_here sigs `thenRn` \ sigs_for_me ->
+ mapFvRn rnMatch matches `thenRn` \ (new_matches, fvs) ->
+ mapRn_ (checkPrecMatch inf new_name) new_matches `thenRn_`
returnRn
- [(unitNameSet name',
- fvs `unionNameSets` sigs_fvs,
- FunMonoBind name' inf new_matches locn,
+ [(unitNameSet new_name,
+ fvs,
+ FunMonoBind new_name inf new_matches locn,
sigs_for_me
)]
+
+
+sigsForMe names_bound_here sigs
+ = foldlRn check [] (filter (sigForThisGroup names_bound_here) sigs)
+ where
+ check sigs sig = case filter (eqHsSig sig) sigs of
+ [] -> returnRn (sig:sigs)
+ other -> dupSigDeclErr sig `thenRn_`
+ returnRn sigs
\end{code}
-@rnMethodBinds@ is used for the method bindings of an instance
-declaration. like @rnMonoBinds@ but without dependency analysis.
+@rnMethodBinds@ is used for the method bindings of a class and an instance
+declaration. Like @rnMonoBinds@ but without dependency analysis.
+
+NOTA BENE: we record each {\em binder} of a method-bind group as a free variable.
+That's crucial when dealing with an instance decl:
+\begin{verbatim}
+ instance Foo (T a) where
+ op x = ...
+\end{verbatim}
+This might be the {\em sole} occurrence of @op@ for an imported class @Foo@,
+and unless @op@ occurs we won't treat the type signature of @op@ in the class
+decl for @Foo@ as a source of instance-decl gates. But we should! Indeed,
+in many ways the @op@ in an instance decl is just like an occurrence, not
+a binder.
\begin{code}
-rnMethodBinds :: RdrNameMonoBinds -> RnMS s RenamedMonoBinds
+rnMethodBinds :: [Name] -- Names for generic type variables
+ -> RdrNameMonoBinds
+ -> RnMS (RenamedMonoBinds, FreeVars)
-rnMethodBinds EmptyMonoBinds = returnRn EmptyMonoBinds
+rnMethodBinds gen_tyvars EmptyMonoBinds = returnRn (EmptyMonoBinds, emptyFVs)
-rnMethodBinds (AndMonoBinds mb1 mb2)
- = andRn AndMonoBinds (rnMethodBinds mb1)
- (rnMethodBinds mb2)
+rnMethodBinds gen_tyvars (AndMonoBinds mb1 mb2)
+ = rnMethodBinds gen_tyvars mb1 `thenRn` \ (mb1', fvs1) ->
+ rnMethodBinds gen_tyvars mb2 `thenRn` \ (mb2', fvs2) ->
+ returnRn (mb1' `AndMonoBinds` mb2', fvs1 `plusFV` fvs2)
-rnMethodBinds (FunMonoBind occname inf matches locn)
- = pushSrcLocRn locn $
- mapRn (checkPrecMatch inf occname) matches `thenRn_`
+rnMethodBinds gen_tyvars (FunMonoBind name inf matches locn)
+ = pushSrcLocRn locn $
- newLocalNames [(occname, locn)] `thenRn` \ [op_name] ->
- -- Make a fresh local for the bound variable; it must be different
- -- to occurrences of the same thing on the LHS, which refer to the global
- -- selectors.
+ lookupGlobalOccRn name `thenRn` \ sel_name ->
+ -- We use the selector name as the binder
- mapAndUnzipRn rnMatch matches `thenRn` \ (new_matches, _) ->
- returnRn (FunMonoBind op_name inf new_matches locn)
+ mapFvRn rn_match matches `thenRn` \ (new_matches, fvs) ->
+ mapRn_ (checkPrecMatch inf sel_name) new_matches `thenRn_`
+ returnRn (FunMonoBind sel_name inf new_matches locn, fvs `addOneFV` sel_name)
+ where
+ -- Gruesome; bring into scope the correct members of the generic type variables
+ -- See comments in RnSource.rnDecl(ClassDecl)
+ rn_match match@(Match _ (TypePatIn ty : _) _ _)
+ = extendTyVarEnvFVRn gen_tvs (rnMatch match)
+ where
+ tvs = map rdrNameOcc (extractHsTyRdrNames ty)
+ gen_tvs = [tv | tv <- gen_tyvars, nameOccName tv `elem` tvs]
-rnMethodBinds (PatMonoBind (VarPatIn occname) grhss_and_binds locn)
- = pushSrcLocRn locn $
- newLocalNames [(occname, locn)] `thenRn` \ [op_name] ->
- rnGRHSsAndBinds grhss_and_binds `thenRn` \ (grhss_and_binds', _) ->
- returnRn (PatMonoBind (VarPatIn op_name) grhss_and_binds' locn)
+ rn_match match = rnMatch match
+
-- Can't handle method pattern-bindings which bind multiple methods.
-rnMethodBinds mbind@(PatMonoBind other_pat _ locn)
+rnMethodBinds gen_tyvars mbind@(PatMonoBind other_pat _ locn)
= pushSrcLocRn locn $
- failWithRn EmptyMonoBinds (methodBindErr mbind)
+ failWithRn (EmptyMonoBinds, emptyFVs) (methodBindErr mbind)
\end{code}
-\begin{code}
--- If a SPECIALIZE pragma is of the "... = blah" form,
--- then we'd better make sure "blah" is taken into
--- acct in the dependency analysis (or we get an
--- unexpected out-of-scope error)! WDP 95/07
-
-sig_fv (SpecSig _ _ (Just blah) _) acc = acc `unionNameSets` (unitNameSet blah)
-sig_fv _ acc = acc
-\end{code}
%************************************************************************
%* *
%************************************************************************
%* *
-%* Manipulating FlatMonoBindInfo *
+\subsubsection{ Manipulating FlatMonoBindInfo}
%* *
%************************************************************************
%* *
%************************************************************************
-@rnBindSigs@ checks for: (a)~more than one sig for one thing;
-(b)~signatures given for things not bound here; (c)~with suitably
-flaggery, that all top-level things have type signatures.
+@renameSigs@ checks for:
+\begin{enumerate}
+\item more than one sig for one thing;
+\item signatures given for things not bound here;
+\item with suitably flaggery, that all top-level things have type signatures.
+\end{enumerate}
+%
+At the moment we don't gather free-var info from the types in
+signatures. We'd only need this if we wanted to report unused tyvars.
\begin{code}
-rnBindSigs :: TopLevelFlag
- -> NameSet -- Set of names bound in this group
- -> [RdrNameSig]
- -> RnMS s [RenamedSig] -- List of Sig constructors
+renameSigsFVs ok_sig sigs
+ = renameSigs ok_sig sigs `thenRn` \ sigs' ->
+ returnRn (sigs', hsSigsFVs sigs')
+
+renameSigs :: (RenamedSig -> Bool) -- OK-sig predicate
+ -> [RdrNameSig]
+ -> RnMS [RenamedSig]
-rnBindSigs top_lev binders sigs
+renameSigs ok_sig [] = returnRn []
+
+renameSigs ok_sig sigs
= -- Rename the signatures
mapRn renameSig sigs `thenRn` \ sigs' ->
-- Check for (a) duplicate signatures
-- (b) signatures for things not in this group
- -- (c) optionally, bindings with no signature
let
- (goodies, dups) = removeDups cmp_sig (filter (not.isUnboundName.sig_name) sigs')
- not_this_group = filter (\sig -> not (sig_name sig `elemNameSet` binders)) goodies
- type_sig_vars = [n | Sig n _ _ <- goodies]
- sigs_required = case top_lev of {TopLevel -> opt_SigsRequired; NotTopLevel -> False}
- un_sigd_binders | sigs_required = nameSetToList binders `minusList` type_sig_vars
- | otherwise = []
+ in_scope = filter is_in_scope sigs'
+ is_in_scope sig = case sigName sig of
+ Just n -> not (isUnboundName n)
+ Nothing -> True
+ (goods, bads) = partition ok_sig in_scope
in
- mapRn dupSigDeclErr dups `thenRn_`
- mapRn unknownSigErr not_this_group `thenRn_`
- mapRn (addErrRn.missingSigErr) un_sigd_binders `thenRn_`
-
- returnRn sigs' -- bad ones and all:
- -- we need bindings of *some* sort for every name
-
-
+ mapRn_ unknownSigErr bads `thenRn_`
+ returnRn goods
+
+-- We use lookupSigOccRn in the signatures, which is a little bit unsatisfactory
+-- because this won't work for:
+-- instance Foo T where
+-- {-# INLINE op #-}
+-- Baz.op = ...
+-- We'll just rename the INLINE prag to refer to whatever other 'op'
+-- is in scope. (I'm assuming that Baz.op isn't in scope unqualified.)
+-- Doesn't seem worth much trouble to sort this.
+
+renameSig :: Sig RdrName -> RnMS (Sig Name)
+-- ClassOpSig is renamed elsewhere.
renameSig (Sig v ty src_loc)
= pushSrcLocRn src_loc $
- lookupBndrRn v `thenRn` \ new_v ->
+ lookupSigOccRn v `thenRn` \ new_v ->
rnHsSigType (quotes (ppr v)) ty `thenRn` \ new_ty ->
returnRn (Sig new_v new_ty src_loc)
-renameSig (SpecSig v ty using src_loc)
+renameSig (SpecInstSig ty src_loc)
= pushSrcLocRn src_loc $
- lookupBndrRn v `thenRn` \ new_v ->
+ rnHsType (text "A SPECIALISE instance pragma") ty `thenRn` \ new_ty ->
+ returnRn (SpecInstSig new_ty src_loc)
+
+renameSig (SpecSig v ty src_loc)
+ = pushSrcLocRn src_loc $
+ lookupSigOccRn v `thenRn` \ new_v ->
rnHsSigType (quotes (ppr v)) ty `thenRn` \ new_ty ->
- rn_using using `thenRn` \ new_using ->
- returnRn (SpecSig new_v new_ty new_using src_loc)
- where
- rn_using Nothing = returnRn Nothing
- rn_using (Just x) = lookupOccRn x `thenRn` \ new_x ->
- returnRn (Just new_x)
+ returnRn (SpecSig new_v new_ty src_loc)
-renameSig (InlineSig v src_loc)
+renameSig (FixSig (FixitySig v fix src_loc))
= pushSrcLocRn src_loc $
- lookupBndrRn v `thenRn` \ new_v ->
- returnRn (InlineSig new_v src_loc)
+ lookupSigOccRn v `thenRn` \ new_v ->
+ returnRn (FixSig (FixitySig new_v fix src_loc))
-renameSig (MagicUnfoldingSig v str src_loc)
+renameSig (InlineSig v p src_loc)
= pushSrcLocRn src_loc $
- lookupBndrRn v `thenRn` \ new_v ->
- returnRn (MagicUnfoldingSig new_v str src_loc)
-\end{code}
+ lookupSigOccRn v `thenRn` \ new_v ->
+ returnRn (InlineSig new_v p src_loc)
-Checking for distinct signatures; oh, so boring
+renameSig (NoInlineSig v p src_loc)
+ = pushSrcLocRn src_loc $
+ lookupSigOccRn v `thenRn` \ new_v ->
+ returnRn (NoInlineSig new_v p src_loc)
+\end{code}
\begin{code}
-cmp_sig :: RenamedSig -> RenamedSig -> Ordering
-cmp_sig (Sig n1 _ _) (Sig n2 _ _) = n1 `compare` n2
-cmp_sig (InlineSig n1 _) (InlineSig n2 _) = n1 `compare` n2
-cmp_sig (MagicUnfoldingSig n1 _ _) (MagicUnfoldingSig n2 _ _) = n1 `compare` n2
-cmp_sig (SpecSig n1 ty1 _ _) (SpecSig n2 ty2 _ _)
- = -- may have many specialisations for one value;
- -- but not ones that are exactly the same...
- thenCmp (n1 `compare` n2) (cmpHsType compare ty1 ty2)
-
-cmp_sig other_1 other_2 -- Tags *must* be different
- | (sig_tag other_1) _LT_ (sig_tag other_2) = LT
- | otherwise = GT
-
-sig_tag (Sig n1 _ _) = (ILIT(1) :: FAST_INT)
-sig_tag (SpecSig n1 _ _ _) = ILIT(2)
-sig_tag (InlineSig n1 _) = ILIT(3)
-sig_tag (MagicUnfoldingSig n1 _ _) = ILIT(4)
-sig_tag _ = panic# "tag(RnBinds)"
-
-sig_name (Sig n _ _) = n
-sig_name (ClassOpSig n _ _ _) = n
-sig_name (SpecSig n _ _ _) = n
-sig_name (InlineSig n _) = n
-sig_name (MagicUnfoldingSig n _ _) = n
+renameIE :: (RdrName -> RnMS Name) -> IE RdrName -> RnMS (IE Name, FreeVars)
+renameIE lookup_occ_nm (IEVar v)
+ = lookup_occ_nm v `thenRn` \ new_v ->
+ returnRn (IEVar new_v, unitFV new_v)
+
+renameIE lookup_occ_nm (IEThingAbs v)
+ = lookup_occ_nm v `thenRn` \ new_v ->
+ returnRn (IEThingAbs new_v, unitFV new_v)
+
+renameIE lookup_occ_nm (IEThingAll v)
+ = lookup_occ_nm v `thenRn` \ new_v ->
+ returnRn (IEThingAll new_v, unitFV new_v)
+
+renameIE lookup_occ_nm (IEThingWith v vs)
+ = lookup_occ_nm v `thenRn` \ new_v ->
+ mapRn lookup_occ_nm vs `thenRn` \ new_vs ->
+ returnRn (IEThingWith new_v new_vs, plusFVs [ unitFV x | x <- new_v:new_vs ])
+
+renameIE lookup_occ_nm (IEModuleContents m)
+ = returnRn (IEModuleContents m, emptyFVs)
\end{code}
+
%************************************************************************
%* *
\subsection{Error messages}
%************************************************************************
\begin{code}
-dupSigDeclErr (sig:sigs)
+dupSigDeclErr sig
= pushSrcLocRn loc $
- addErrRn (sep [ptext SLIT("more than one"),
- ptext what_it_is, ptext SLIT("given for"),
- quotes (ppr (sig_name sig))])
+ addErrRn (sep [ptext SLIT("Duplicate") <+> ptext what_it_is <> colon,
+ ppr sig])
where
- (what_it_is, loc) = sig_doc sig
+ (what_it_is, loc) = hsSigDoc sig
unknownSigErr sig
= pushSrcLocRn loc $
- addErrRn (sep [ptext flavour, ptext SLIT("but no definition for"),
- quotes (ppr (sig_name sig))])
+ addErrRn (sep [ptext SLIT("Misplaced") <+> ptext what_it_is <> colon,
+ ppr sig])
where
- (flavour, loc) = sig_doc sig
-
-sig_doc (Sig _ _ loc) = (SLIT("type signature"),loc)
-sig_doc (ClassOpSig _ _ _ loc) = (SLIT("class-method type signature"), loc)
-sig_doc (SpecSig _ _ _ loc) = (SLIT("SPECIALIZE pragma"),loc)
-sig_doc (InlineSig _ loc) = (SLIT("INLINE pragma"),loc)
-sig_doc (MagicUnfoldingSig _ _ loc) = (SLIT("MAGIC_UNFOLDING pragma"),loc)
+ (what_it_is, loc) = hsSigDoc sig
-missingSigErr var
- = sep [ptext SLIT("Definition but no type signature for"), quotes (ppr var)]
+missingSigWarn var
+ = pushSrcLocRn (nameSrcLoc var) $
+ addWarnRn (sep [ptext SLIT("Definition but no type signature for"), quotes (ppr var)])
methodBindErr mbind
= hang (ptext SLIT("Can't handle multiple methods defined by one pattern binding"))
projects / ghc-hetmet.git / blobdiff