%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[RnSource]{Main pass of renamer}
\begin{code}
-module RnSource ( rnDecl, rnHsType, rnHsSigType ) where
+module RnSource ( rnDecl, rnSourceDecls, rnHsType, rnHsSigType ) where
#include "HsVersions.h"
import RnExpr
import HsSyn
-import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
import HsPragmas
import HsTypes ( getTyVarName, pprClassAssertion, cmpHsTypes )
-import RdrHsSyn
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, isRdrTyVar )
+import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl,
+ extractRuleBndrsTyVars, extractHsTyRdrTyVars
+ )
import RnHsSyn
import HsCore
-import CmdLineOpts ( opt_IgnoreIfacePragmas )
-import RnBinds ( rnTopBinds, rnMethodBinds )
-import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, lookupImplicitOccRn, bindLocalsRn,
- newDfunName, checkDupOrQualNames, checkDupNames,
- newLocallyDefinedGlobalName, newImportedGlobalName, ifaceFlavour,
- listType_RDR, tupleType_RDR )
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr )
+import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn,
+ lookupImplicitOccRn,
+ bindLocalsRn, bindLocalRn, bindLocalsFVRn,
+ bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn,
+ bindCoreLocalFVRn, bindCoreLocalsFVRn,
+ checkDupOrQualNames, checkDupNames,
+ mkImportedGlobalName, mkImportedGlobalFromRdrName,
+ newDFunName, getDFunKey, newImplicitBinder,
+ FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV, mapFvRn
+ )
import RnMonad
-import Name ( Name, OccName(..), occNameString, prefixOccName,
- ExportFlag(..), Provenance(..), NameSet,
- elemNameSet, nameOccName, NamedThing(..)
+import Name ( Name, OccName,
+ ExportFlag(..), Provenance(..),
+ nameOccName, NamedThing(..)
+ )
+import NameSet
+import OccName ( mkDefaultMethodOcc )
+import BasicTypes ( TopLevelFlag(..) )
+import FiniteMap ( elemFM )
+import PrelInfo ( derivingOccurrences, numClass_RDR,
+ deRefStablePtr_NAME, makeStablePtr_NAME,
+ bindIO_NAME
)
-import FiniteMap ( lookupFM )
-import Id ( GenId{-instance NamedThing-} )
-import IdInfo ( FBTypeInfo, ArgUsageInfo )
-import Lex ( isLexCon )
-import PrelInfo ( derivingOccurrences, evalClass_RDR, numClass_RDR, allClass_NAME )
-import Maybes ( maybeToBool )
import Bag ( bagToList )
+import List ( partition, nub )
import Outputable
import SrcLoc ( SrcLoc )
-import Unique ( Unique )
-import UniqSet ( UniqSet )
-import UniqFM ( UniqFM, lookupUFM )
+import CmdLineOpts ( opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars
+import UniqFM ( lookupUFM )
+import Maybes ( maybeToBool, catMaybes )
import Util
-import List ( partition, nub )
\end{code}
-rnDecl `renames' declarations.
+@rnDecl@ `renames' declarations.
It simultaneously performs dependency analysis and precedence parsing.
It also does the following error checks:
\begin{enumerate}
\item
Checks that all variable occurences are defined.
\item
-Checks the (..) etc constraints in the export list.
+Checks the @(..)@ etc constraints in the export list.
\end{enumerate}
%*********************************************************
\begin{code}
-rnDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl
+rnSourceDecls :: [RdrNameHsDecl] -> RnMS ([RenamedHsDecl], FreeVars)
+ -- The decls get reversed, but that's ok
+
+rnSourceDecls decls
+ = go emptyFVs [] decls
+ where
+ -- Fixity decls have been dealt with already; ignore them
+ go fvs ds' [] = returnRn (ds', fvs)
+ go fvs ds' (FixD _:ds) = go fvs ds' ds
+ go fvs ds' (d:ds) = rnDecl d `thenRn` \(d', fvs') ->
+ go (fvs `plusFV` fvs') (d':ds') ds
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Value declarations}
+%* *
+%*********************************************************
+
+\begin{code}
+-- rnDecl does all the work
+rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
-rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ new_binds ->
- returnRn (ValD new_binds)
+rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
+ returnRn (ValD new_binds, fvs)
rnDecl (SigD (IfaceSig name ty id_infos loc))
= pushSrcLocRn loc $
lookupBndrRn name `thenRn` \ name' ->
- rnHsType ty `thenRn` \ ty' ->
-
- -- Get the pragma info (if any).
- getModeRn `thenRn` \ (InterfaceMode _ print_unqual) ->
- setModeRn (InterfaceMode Optional print_unqual) $
- -- In all the rest of the signature we read in optional mode,
- -- so that (a) we don't die
- mapRn rnIdInfo id_infos `thenRn` \ id_infos' ->
- returnRn (SigD (IfaceSig name' ty' id_infos' loc))
+ rnHsType doc_str ty `thenRn` \ (ty',fvs1) ->
+ mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) ->
+ returnRn (SigD (IfaceSig name' ty' id_infos' loc), fvs1 `plusFV` fvs2)
+ where
+ doc_str = text "the interface signature for" <+> quotes (ppr name)
\end{code}
%*********************************************************
Renaming type variables is a pain. Because they now contain uniques,
it is necessary to pass in an association list which maps a parsed
-tyvar to its Name representation. In some cases (type signatures of
-values), it is even necessary to go over the type first in order to
-get the set of tyvars used by it, make an assoc list, and then go over
-it again to rename the tyvars! However, we can also do some scoping
-checks at the same time.
+tyvar to its @Name@ representation.
+In some cases (type signatures of values),
+it is even necessary to go over the type first
+in order to get the set of tyvars used by it, make an assoc list,
+and then go over it again to rename the tyvars!
+However, we can also do some scoping checks at the same time.
\begin{code}
-rnDecl (TyD (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc))
+rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc))
= pushSrcLocRn src_loc $
- lookupBndrRn tycon `thenRn` \ tycon' ->
- bindTyVarsRn data_doc tyvars $ \ tyvars' ->
- rnContext context `thenRn` \ context' ->
- checkDupOrQualNames data_doc con_names `thenRn_`
- mapRn rnConDecl condecls `thenRn` \ condecls' ->
- rnDerivs derivings `thenRn` \ derivings' ->
+ lookupBndrRn tycon `thenRn` \ tycon' ->
+ bindTyVarsFVRn data_doc tyvars $ \ tyvars' ->
+ rnContext data_doc context `thenRn` \ (context', cxt_fvs) ->
+ checkDupOrQualNames data_doc con_names `thenRn_`
+ mapFvRn rnConDecl condecls `thenRn` \ (condecls', con_fvs) ->
+ rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) ->
ASSERT(isNoDataPragmas pragmas)
- returnRn (TyD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc))
+ returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls'
+ derivings' noDataPragmas src_loc),
+ cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs)
where
- data_doc = text "the data type declaration for" <+> ppr tycon
+ data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
con_names = map conDeclName condecls
-rnDecl (TyD (TySynonym name tyvars ty src_loc))
+rnDecl (TyClD (TySynonym name tyvars ty src_loc))
= pushSrcLocRn src_loc $
lookupBndrRn name `thenRn` \ name' ->
- bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
- rnHsType ty `thenRn` \ ty' ->
- returnRn (TyD (TySynonym name' tyvars' ty' src_loc))
+ bindTyVarsFVRn syn_doc tyvars $ \ tyvars' ->
+ rnHsType syn_doc ty `thenRn` \ (ty', ty_fvs) ->
+ returnRn (TyClD (TySynonym name' tyvars' ty' src_loc), ty_fvs)
where
- syn_doc = text "the declaration for type synonym" <+> ppr name
-\end{code}
+ syn_doc = text "the declaration for type synonym" <+> quotes (ppr name)
-%*********************************************************
-%* *
-\subsection{Class declarations}
-%* *
-%*********************************************************
-
-@rnClassDecl@ uses the `global name function' to create a new
-class declaration in which local names have been replaced by their
-original names, reporting any unknown names.
-
-\begin{code}
-rnDecl (ClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname src_loc))
+rnDecl (TyClD (ClassDecl context cname tyvars sigs mbinds pragmas
+ tname dname snames src_loc))
= pushSrcLocRn src_loc $
lookupBndrRn cname `thenRn` \ cname' ->
- lookupBndrRn tname `thenRn` \ tname' ->
- lookupBndrRn dname `thenRn` \ dname' ->
- bindTyVarsRn cls_doc tyvars ( \ tyvars' ->
- rnContext context `thenRn` \ context' ->
+ -- Deal with the implicit tycon and datacon name
+ -- They aren't in scope (because they aren't visible to the user)
+ -- and what we want to do is simply look them up in the cache;
+ -- we jolly well ought to get a 'hit' there!
+ -- So the 'Imported' part of this call is not relevant.
+ -- Unclean; but since these two are the only place this happens
+ -- I can't work up the energy to do it more beautifully
+ mkImportedGlobalFromRdrName tname `thenRn` \ tname' ->
+ mkImportedGlobalFromRdrName dname `thenRn` \ dname' ->
+ mapRn mkImportedGlobalFromRdrName snames `thenRn` \ snames' ->
- -- Check the signatures
- let
- clas_tyvar_names = map getTyVarName tyvars'
- in
- checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
- mapRn (rn_op cname' clas_tyvar_names) sigs `thenRn` \ sigs' ->
- returnRn (tyvars', context', sigs')
- ) `thenRn` \ (tyvars', context', sigs') ->
+ -- Tyvars scope over bindings and context
+ bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' ->
+
+ -- Check the superclasses
+ rnContext cls_doc context `thenRn` \ (context', cxt_fvs) ->
+
+ -- Check the signatures
+ let
+ -- First process the class op sigs, then the fixity sigs.
+ (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ (fix_sigs, non_sigs) = partition isFixitySig non_op_sigs
+ in
+ checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
+ mapFvRn (rn_op cname' clas_tyvar_names) op_sigs
+ `thenRn` \ (sigs', sig_fvs) ->
+ mapRn_ (unknownSigErr) non_sigs `thenRn_`
+ let
+ binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
+ in
+ renameSigs False binders lookupOccRn fix_sigs
+ `thenRn` \ (fixs', fix_fvs) ->
-- Check the methods
checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
+ rnMethodBinds mbinds
+ `thenRn` \ (mbinds', meth_fvs) ->
-- Typechecker is responsible for checking that we only
-- give default-method bindings for things in this class.
-- for instance decls.
ASSERT(isNoClassPragmas pragmas)
- returnRn (ClD (ClassDecl context' cname' tyvars' sigs' mbinds' NoClassPragmas tname' dname' src_loc))
+ returnRn (TyClD (ClassDecl context' cname' tyvars' (fixs' ++ sigs') mbinds'
+ NoClassPragmas tname' dname' snames' src_loc),
+ sig_fvs `plusFV`
+ fix_fvs `plusFV`
+ cxt_fvs `plusFV`
+ meth_fvs
+ )
+ )
where
cls_doc = text "the declaration for class" <+> ppr cname
sig_doc = text "the signatures for class" <+> ppr cname
- meth_doc = text "the default-methods for class" <+> ppr cname
+ meth_doc = text "the default-methods for class" <+> ppr cname
sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
meth_rdr_names_w_locs = bagToList (collectMonoBinders mbinds)
rn_op clas clas_tyvars sig@(ClassOpSig op maybe_dm ty locn)
= pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
+ lookupBndrRn op `thenRn` \ op_name ->
- -- Make the default-method name
+ -- Check the signature
+ rnHsSigType (quotes (ppr op)) ty `thenRn` \ (new_ty, op_ty_fvs) ->
let
- dm_occ = prefixOccName SLIT("$m") (rdrNameOcc op)
+ check_in_op_ty clas_tyvar =
+ checkRn (clas_tyvar `elemNameSet` op_ty_fvs)
+ (classTyVarNotInOpTyErr clas_tyvar sig)
in
- getModuleRn `thenRn` \ mod_name ->
- getModeRn `thenRn` \ mode ->
- (case (mode, maybe_dm) of
- (SourceMode, _) | op `elem` meth_rdr_names
- -> -- There's an explicit method decl
- newLocallyDefinedGlobalName mod_name dm_occ
- (\_ -> Exported) locn `thenRn` \ dm_name ->
- returnRn (Just dm_name)
+ mapRn_ check_in_op_ty clas_tyvars `thenRn_`
- (InterfaceMode _ _, Just _)
+ -- Make the default-method name
+ getModeRn `thenRn` \ mode ->
+ (case (mode, maybe_dm) of
+ (SourceMode, _)
+ | op `elem` meth_rdr_names
+ -> -- Source class decl with an explicit method decl
+ newImplicitBinder (mkDefaultMethodOcc (rdrNameOcc op)) locn
+ `thenRn` \ dm_name ->
+ returnRn (Just dm_name, emptyFVs)
+
+ | otherwise
+ -> -- Source class dec, no explicit method decl
+ returnRn (Nothing, emptyFVs)
+
+ (InterfaceMode, Just dm_rdr_name)
-> -- Imported class that has a default method decl
- newImportedGlobalName mod_name dm_occ (ifaceFlavour clas) `thenRn` \ dm_name ->
- addOccurrenceName dm_name `thenRn_`
- returnRn (Just dm_name)
-
- other -> returnRn Nothing
- ) `thenRn` \ maybe_dm_name ->
-
- -- Check that each class tyvar appears in op_ty
- let
- (ctxt, op_ty) = case new_ty of
- HsForAllTy tvs ctxt op_ty -> (ctxt, op_ty)
- other -> ([], new_ty)
- ctxt_fvs = extractHsCtxtTyNames ctxt -- Includes tycons/classes but we
- op_ty_fvs = extractHsTyNames op_ty -- don't care about that
-
- check_in_op_ty clas_tyvar = checkRn (clas_tyvar `elemNameSet` op_ty_fvs)
- (classTyVarNotInOpTyErr clas_tyvar sig)
- in
- mapRn check_in_op_ty clas_tyvars `thenRn_`
-
- returnRn (ClassOpSig op_name maybe_dm_name new_ty locn)
+ -- See comments with tname, snames, above
+ lookupImplicitOccRn dm_rdr_name `thenRn` \ dm_name ->
+ returnRn (Just dm_name, unitFV dm_name)
+ -- An imported class decl mentions, rather than defines,
+ -- the default method, so we must arrange to pull it in
+
+ (InterfaceMode, Nothing)
+ -- Imported class with no default metho
+ -> returnRn (Nothing, emptyFVs)
+ ) `thenRn` \ (maybe_dm_name, dm_fvs) ->
+
+ returnRn (ClassOpSig op_name maybe_dm_name new_ty locn, op_ty_fvs `plusFV` dm_fvs)
\end{code}
%*********************************************************
\begin{code}
-rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun src_loc))
+rnDecl (InstD (InstDecl inst_ty mbinds uprags dfun_rdr_name src_loc))
= pushSrcLocRn src_loc $
- rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
-
+ rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
+ let
+ inst_tyvars = case inst_ty' of
+ HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars
+ other -> []
+ -- (Slightly strangely) the forall-d tyvars scope over
+ -- the method bindings too
+ in
-- Rename the bindings
-- NB meth_names can be qualified!
checkDupNames meth_doc meth_names `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
- mapRn rn_uprag uprags `thenRn` \ new_uprags ->
-
- let
- -- We use the class name and the name of the first
- -- type constructor the class is applied to.
- (cl_nm, tycon_nm) = mkDictPrefix inst_ty'
-
- mkDictPrefix (MonoDictTy cl tys) =
- case tys of
- [] -> (c_nm, nilOccName )
- (ty:_) -> (c_nm, getInstHeadTy ty)
- where
- c_nm = nameOccName (getName cl)
-
- mkDictPrefix (HsPreForAllTy _ ty) = mkDictPrefix ty
- mkDictPrefix (HsForAllTy _ _ ty) = mkDictPrefix ty -- can this
- mkDictPrefix _ = (nilOccName, nilOccName)
-
- getInstHeadTy t
- = case t of
- MonoTyVar tv -> nameOccName (getName tv)
- MonoTyApp t _ -> getInstHeadTy t
- _ -> nilOccName
- -- I cannot see how the rest of HsType constructors
- -- can occur, but this isn't really a failure condition,
- -- so we return silently.
-
- nilOccName = (VarOcc _NIL_) -- ToDo: add OccName constructor fun for this.
+ extendTyVarEnvFVRn inst_tyvars (
+ rnMethodBinds mbinds
+ ) `thenRn` \ (mbinds', meth_fvs) ->
+ let
+ binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds')))
+
+ -- Delete sigs (&report) sigs that aren't allowed inside an
+ -- instance decl:
+ --
+ -- + type signatures
+ -- + fixity decls
+ --
+ (ok_sigs, not_ok_idecl_sigs) = partition okInInstDecl uprags
+
+ okInInstDecl (FixSig _) = False
+ okInInstDecl (Sig _ _ _) = False
+ okInInstDecl _ = True
+
in
- newDfunName cl_nm tycon_nm maybe_dfun src_loc `thenRn` \ dfun_name ->
- addOccurrenceName dfun_name `thenRn_`
- -- The dfun is not optional, because we use its version number
- -- to identify the version of the instance declaration
+ -- You can't have fixity decls & type signatures
+ -- within an instance declaration.
+ mapRn_ unknownSigErr not_ok_idecl_sigs `thenRn_`
+
+ -- Rename the prags and signatures.
+ -- Note that the type variables are not in scope here,
+ -- so that instance Eq a => Eq (T a) where
+ -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
+ -- works OK.
+ renameSigs False binders lookupOccRn ok_sigs `thenRn` \ (new_uprags, prag_fvs) ->
+
+ getModeRn `thenRn` \ mode ->
+ (case mode of
+ InterfaceMode -> lookupImplicitOccRn dfun_rdr_name `thenRn` \ dfun_name ->
+ returnRn (dfun_name, unitFV dfun_name)
+ SourceMode -> newDFunName (getDFunKey inst_ty') src_loc
+ `thenRn` \ dfun_name ->
+ returnRn (dfun_name, emptyFVs)
+ )
+ `thenRn` \ (dfun_name, dfun_fv) ->
- -- The typechecker checks that all the bindings are for the right class.
- returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags (Just dfun_name) src_loc))
+ -- The typechecker checks that all the bindings are for the right class.
+ returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags dfun_name src_loc),
+ inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv)
where
meth_doc = text "the bindings in an instance declaration"
meth_names = bagToList (collectMonoBinders mbinds)
+\end{code}
- rn_uprag (SpecSig op ty using locn)
- = pushSrcLocRn src_loc $
- lookupBndrRn op `thenRn` \ op_name ->
- rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
- rn_using using `thenRn` \ new_using ->
- returnRn (SpecSig op_name new_ty new_using locn)
+%*********************************************************
+%* *
+\subsection{Default declarations}
+%* *
+%*********************************************************
- rn_uprag (InlineSig op locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (InlineSig op_name locn)
+\begin{code}
+rnDecl (DefD (DefaultDecl tys src_loc))
+ = pushSrcLocRn src_loc $
+ rnHsTypes doc_str tys `thenRn` \ (tys', fvs) ->
+ lookupImplicitOccRn numClass_RDR `thenRn` \ num ->
+ returnRn (DefD (DefaultDecl tys' src_loc), fvs `addOneFV` num)
+ where
+ doc_str = text "a `default' declaration"
+\end{code}
- rn_uprag (MagicUnfoldingSig op str locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (MagicUnfoldingSig op_name str locn)
+%*********************************************************
+%* *
+\subsection{Foreign declarations}
+%* *
+%*********************************************************
- rn_using Nothing = returnRn Nothing
- rn_using (Just v) = lookupOccRn v `thenRn` \ new_v ->
- returnRn (Just new_v)
+\begin{code}
+rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
+ = pushSrcLocRn src_loc $
+ lookupBndrRn name `thenRn` \ name' ->
+ let
+ fvs1 = case imp_exp of
+ FoImport _ | not isDyn -> emptyFVs
+ FoLabel -> emptyFVs
+ FoExport | isDyn -> mkNameSet [makeStablePtr_NAME,
+ deRefStablePtr_NAME,
+ bindIO_NAME]
+ _ -> emptyFVs
+ in
+ rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs2) ->
+ returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc),
+ fvs1 `plusFV` fvs2)
+ where
+ fo_decl_msg = ptext SLIT("a foreign declaration")
+ isDyn = isDynamic ext_nm
\end{code}
%*********************************************************
%* *
-\subsection{Default declarations}
+\subsection{Rules}
%* *
%*********************************************************
\begin{code}
-rnDecl (DefD (DefaultDecl tys src_loc))
- = pushSrcLocRn src_loc $
- mapRn rnHsType tys `thenRn` \ tys' ->
- lookupImplicitOccRn numClass_RDR `thenRn_`
- returnRn (DefD (DefaultDecl tys' src_loc))
+rnDecl (RuleD (IfaceRuleDecl var body src_loc))
+ = pushSrcLocRn src_loc $
+ lookupOccRn var `thenRn` \ var' ->
+ rnRuleBody body `thenRn` \ (body', fvs) ->
+ returnRn (RuleD (IfaceRuleDecl var' body' src_loc), fvs `addOneFV` var')
+
+rnDecl (RuleD (RuleDecl rule_name tvs vars lhs rhs src_loc))
+ = ASSERT( null tvs )
+ pushSrcLocRn src_loc $
+
+ bindTyVarsFV2Rn doc (map UserTyVar sig_tvs) $ \ sig_tvs' _ ->
+ bindLocalsFVRn doc (map get_var vars) $ \ ids ->
+ mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) ->
+
+ rnExpr lhs `thenRn` \ (lhs', fv_lhs) ->
+ rnExpr rhs `thenRn` \ (rhs', fv_rhs) ->
+ checkRn (validRuleLhs ids lhs')
+ (badRuleLhsErr rule_name lhs') `thenRn_`
+ let
+ bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
+ in
+ mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
+ returnRn (RuleD (RuleDecl rule_name sig_tvs' vars' lhs' rhs' src_loc),
+ fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
+ where
+ doc = text "the transformation rule" <+> ptext rule_name
+ sig_tvs = extractRuleBndrsTyVars vars
+
+ get_var (RuleBndr v) = v
+ get_var (RuleBndrSig v _) = v
+
+ rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
+ rn_var (RuleBndrSig v t, id) = rnHsType doc t `thenRn` \ (t', fvs) ->
+ returnRn (RuleBndrSig id t', fvs)
\end{code}
+
%*********************************************************
%* *
\subsection{Support code for type/data declarations}
%*********************************************************
\begin{code}
-rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name])
+rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name], FreeVars)
rnDerivs Nothing -- derivs not specified
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- returnRn Nothing
+ = returnRn (Nothing, emptyFVs)
rnDerivs (Just ds)
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- mapRn rn_deriv ds `thenRn` \ derivs ->
- returnRn (Just derivs)
+ = mapFvRn rn_deriv ds `thenRn` \ (derivs, fvs) ->
+ returnRn (Just derivs, fvs)
where
rn_deriv clas
= lookupOccRn clas `thenRn` \ clas_name ->
-- generate code for this class.
case lookupUFM derivingOccurrences clas_name of
Nothing -> addErrRn (derivingNonStdClassErr clas_name) `thenRn_`
- returnRn clas_name
+ returnRn (clas_name, unitFV clas_name)
- Just occs -> mapRn lookupImplicitOccRn occs `thenRn_`
- returnRn clas_name
+ Just occs -> mapRn lookupImplicitOccRn occs `thenRn` \ names ->
+ returnRn (clas_name, mkNameSet (clas_name : names))
\end{code}
\begin{code}
conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
-conDeclName (ConDecl n _ _ l) = (n,l)
+conDeclName (ConDecl n _ _ _ l) = (n,l)
-rnConDecl :: RdrNameConDecl -> RnMS s RenamedConDecl
-rnConDecl (ConDecl name cxt details locn)
+rnConDecl :: RdrNameConDecl -> RnMS (RenamedConDecl, FreeVars)
+rnConDecl (ConDecl name tvs cxt details locn)
= pushSrcLocRn locn $
checkConName name `thenRn_`
lookupBndrRn name `thenRn` \ new_name ->
- rnConDetails name locn details `thenRn` \ new_details ->
- rnContext cxt `thenRn` \ new_context ->
- returnRn (ConDecl new_name new_context new_details locn)
-
-rnConDetails con locn (VanillaCon tys)
- = mapRn rnBangTy tys `thenRn` \ new_tys ->
- returnRn (VanillaCon new_tys)
-
-rnConDetails con locn (InfixCon ty1 ty2)
- = rnBangTy ty1 `thenRn` \ new_ty1 ->
- rnBangTy ty2 `thenRn` \ new_ty2 ->
- returnRn (InfixCon new_ty1 new_ty2)
-
-rnConDetails con locn (NewCon ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (NewCon new_ty)
-
-rnConDetails con locn (RecCon fields)
- = checkDupOrQualNames fld_doc field_names `thenRn_`
- mapRn rnField fields `thenRn` \ new_fields ->
- returnRn (RecCon new_fields)
+ bindTyVarsFVRn doc tvs $ \ new_tyvars ->
+ rnContext doc cxt `thenRn` \ (new_context, cxt_fvs) ->
+ rnConDetails doc locn details `thenRn` \ (new_details, det_fvs) ->
+ returnRn (ConDecl new_name new_tyvars new_context new_details locn,
+ cxt_fvs `plusFV` det_fvs)
+ where
+ doc = text "the definition of data constructor" <+> quotes (ppr name)
+
+rnConDetails doc locn (VanillaCon tys)
+ = mapFvRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs) ->
+ returnRn (VanillaCon new_tys, fvs)
+
+rnConDetails doc locn (InfixCon ty1 ty2)
+ = rnBangTy doc ty1 `thenRn` \ (new_ty1, fvs1) ->
+ rnBangTy doc ty2 `thenRn` \ (new_ty2, fvs2) ->
+ returnRn (InfixCon new_ty1 new_ty2, fvs1 `plusFV` fvs2)
+
+rnConDetails doc locn (NewCon ty mb_field)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ rn_field mb_field `thenRn` \ new_mb_field ->
+ returnRn (NewCon new_ty new_mb_field, fvs)
+ where
+ rn_field Nothing = returnRn Nothing
+ rn_field (Just f) =
+ lookupBndrRn f `thenRn` \ new_f ->
+ returnRn (Just new_f)
+
+rnConDetails doc locn (RecCon fields)
+ = checkDupOrQualNames doc field_names `thenRn_`
+ mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) ->
+ returnRn (RecCon new_fields, fvs)
where
- fld_doc = text "the fields of constructor" <> ppr con
field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
-rnField (names, ty)
+rnField doc (names, ty)
= mapRn lookupBndrRn names `thenRn` \ new_names ->
- rnBangTy ty `thenRn` \ new_ty ->
- returnRn (new_names, new_ty)
+ rnBangTy doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn ((new_names, new_ty), fvs)
-rnBangTy (Banged ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (Banged new_ty)
+rnBangTy doc (Banged ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Banged new_ty, fvs)
-rnBangTy (Unbanged ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (Unbanged new_ty)
+rnBangTy doc (Unbanged ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Unbanged new_ty, fvs)
+
+rnBangTy doc (Unpacked ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Unpacked new_ty, fvs)
-- This data decl will parse OK
-- data T = a Int
-- from interface files, which always print in prefix form
checkConName name
- = checkRn (isLexCon (occNameString (rdrNameOcc name)))
+ = checkRn (isRdrDataCon name)
(badDataCon name)
\end{code}
%*********************************************************
\begin{code}
-rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType
+rnHsSigType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
-- rnHsSigType is used for source-language type signatures,
-- which use *implicit* universal quantification.
-
--- Given the signature C => T we universally quantify over FV(T) \ {in-scope-tyvars}
---
--- We insist that the universally quantified type vars is a superset of FV(C)
--- It follows that FV(T) is a superset of FV(C), so that the context constrains
--- no type variables that don't appear free in the tau-type part.
-
-rnHsSigType doc_str full_ty@(HsPreForAllTy ctxt ty) -- From source code (no kinds on tyvars)
+rnHsSigType doc_str ty
+ = rnHsType (text "the type signature for" <+> doc_str) ty
+
+rnForAll doc forall_tyvars ctxt ty
+ = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars ->
+ rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) ->
+ rnHsType doc ty `thenRn` \ (new_ty, ty_fvs) ->
+ returnRn (mkHsForAllTy new_tyvars new_ctxt new_ty,
+ cxt_fvs `plusFV` ty_fvs)
+
+-- Check that each constraint mentions at least one of the forall'd type variables
+-- Since the forall'd type variables are a subset of the free tyvars
+-- of the tau-type part, this guarantees that every constraint mentions
+-- at least one of the free tyvars in ty
+checkConstraints explicit_forall doc forall_tyvars ctxt ty
+ = mapRn check ctxt `thenRn` \ maybe_ctxt' ->
+ returnRn (catMaybes maybe_ctxt')
+ -- Remove problem ones, to avoid duplicate error message.
+ where
+ check ct@(_,tys)
+ | forall_mentioned = returnRn (Just ct)
+ | otherwise = addErrRn (ctxtErr explicit_forall doc forall_tyvars ct ty)
+ `thenRn_` returnRn Nothing
+ where
+ forall_mentioned = foldr ((||) . any (`elem` forall_tyvars) . extractHsTyRdrTyVars)
+ False
+ tys
+
+rnHsType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
+
+rnHsType doc (HsForAllTy Nothing ctxt ty)
+ -- From source code (no kinds on tyvars)
+ -- Given the signature C => T we universally quantify
+ -- over FV(T) \ {in-scope-tyvars}
= getLocalNameEnv `thenRn` \ name_env ->
let
- mentioned_tyvars = extractHsTyVars ty
- forall_tyvars = filter (not . in_scope) mentioned_tyvars
- in_scope tv = maybeToBool (lookupFM name_env tv)
-
- constrained_tyvars = extractHsCtxtTyVars ctxt
- constrained_and_in_scope = filter in_scope constrained_tyvars
- constrained_and_not_mentioned = filter (not . (`elem` mentioned_tyvars)) constrained_tyvars
-
- -- Zap the context if there's a problem, to avoid duplicate error message.
- ctxt' | null constrained_and_in_scope && null constrained_and_not_mentioned = ctxt
- | otherwise = []
+ mentioned_in_tau = extractHsTyRdrTyVars ty
+ forall_tyvars = filter (not . (`elemFM` name_env)) mentioned_in_tau
in
- checkRn (null constrained_and_in_scope)
- (ctxtErr1 sig_doc constrained_and_in_scope) `thenRn_`
- checkRn (null constrained_and_not_mentioned)
- (ctxtErr2 sig_doc constrained_and_not_mentioned ty) `thenRn_`
-
- (bindTyVarsRn sig_doc (map UserTyVar forall_tyvars) $ \ new_tyvars ->
- rnContext ctxt' `thenRn` \ new_ctxt ->
- rnHsType ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
- )
- where
- sig_doc = text "the type signature for" <+> doc_str
-
-
-rnHsSigType doc_str other_ty = rnHsType other_ty
-
-rnHsType :: RdrNameHsType -> RnMS s RenamedHsType
-rnHsType (HsForAllTy tvs ctxt ty) -- From an interface file (tyvars may be kinded)
- = rn_poly_help tvs ctxt ty
-
-rnHsType full_ty@(HsPreForAllTy ctxt ty) -- A (context => ty) embedded in a type.
- -- Universally quantify over tyvars in context
- = getLocalNameEnv `thenRn` \ name_env ->
- let
- forall_tyvars = extractHsCtxtTyVars ctxt
+ checkConstraints False doc forall_tyvars ctxt ty `thenRn` \ ctxt' ->
+ rnForAll doc (map UserTyVar forall_tyvars) ctxt' ty
+
+rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau)
+ -- Explicit quantification.
+ -- Check that the forall'd tyvars are a subset of the
+ -- free tyvars in the tau-type part
+ -- That's only a warning... unless the tyvar is constrained by a
+ -- context in which case it's an error
+ = let
+ mentioned_in_tau = extractHsTyRdrTyVars tau
+ mentioned_in_ctxt = nub [tv | (_,tys) <- ctxt,
+ ty <- tys,
+ tv <- extractHsTyRdrTyVars ty]
+
+ dubious_guys = filter (`notElem` mentioned_in_tau) forall_tyvar_names
+ -- dubious = explicitly quantified but not mentioned in tau type
+
+ (bad_guys, warn_guys) = partition (`elem` mentioned_in_ctxt) dubious_guys
+ -- bad = explicitly quantified and constrained, but not mentioned in tau
+ -- warn = explicitly quantified but not mentioned in ctxt or tau
+
+ forall_tyvar_names = map getTyVarName forall_tyvars
in
- rn_poly_help (map UserTyVar forall_tyvars) ctxt ty
+ mapRn_ (forAllErr doc tau) bad_guys `thenRn_`
+ mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
+ checkConstraints True doc forall_tyvar_names ctxt tau `thenRn` \ ctxt' ->
+ rnForAll doc forall_tyvars ctxt' tau
-rnHsType (MonoTyVar tyvar)
+rnHsType doc (MonoTyVar tyvar)
= lookupOccRn tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar')
+ returnRn (MonoTyVar tyvar', unitFV tyvar')
-rnHsType (MonoFunTy ty1 ty2)
- = andRn MonoFunTy (rnHsType ty1) (rnHsType ty2)
+rnHsType doc (MonoFunTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ returnRn (MonoFunTy ty1' ty2', fvs1 `plusFV` fvs2)
-rnHsType (MonoListTy _ ty)
- = lookupImplicitOccRn listType_RDR `thenRn` \ tycon_name ->
- rnHsType ty `thenRn` \ ty' ->
- returnRn (MonoListTy tycon_name ty')
+rnHsType doc (MonoListTy ty)
+ = rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (MonoListTy ty', fvs `addOneFV` listTyCon_name)
-rnHsType (MonoTupleTy _ tys)
- = lookupImplicitOccRn (tupleType_RDR (length tys)) `thenRn` \ tycon_name ->
- mapRn rnHsType tys `thenRn` \ tys' ->
- returnRn (MonoTupleTy tycon_name tys')
+rnHsType doc (MonoTupleTy tys boxed)
+ = rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
+ returnRn (MonoTupleTy tys' boxed, fvs `addOneFV` tup_con_name)
+ where
+ tup_con_name = tupleTyCon_name boxed (length tys)
-rnHsType (MonoTyApp ty1 ty2)
- = rnHsType ty1 `thenRn` \ ty1' ->
- rnHsType ty2 `thenRn` \ ty2' ->
- returnRn (MonoTyApp ty1' ty2')
+rnHsType doc (MonoTyApp ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ returnRn (MonoTyApp ty1' ty2', fvs1 `plusFV` fvs2)
-rnHsType (MonoDictTy clas tys)
+rnHsType doc (MonoDictTy clas tys)
= lookupOccRn clas `thenRn` \ clas' ->
- mapRn rnHsType tys `thenRn` \ tys' ->
- returnRn (MonoDictTy clas' tys')
-
-rn_poly_help :: [HsTyVar RdrName] -- Universally quantified tyvars
- -> RdrNameContext
- -> RdrNameHsType
- -> RnMS s RenamedHsType
-rn_poly_help tyvars ctxt ty
- = bindTyVarsRn sig_doc tyvars $ \ new_tyvars ->
- rnContext ctxt `thenRn` \ new_ctxt ->
- rnHsType ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
- where
- sig_doc = text "a nested for-all type"
+ rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
+ returnRn (MonoDictTy clas' tys', fvs `addOneFV` clas')
+
+rnHsType doc (MonoUsgTy usg ty)
+ = rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (MonoUsgTy usg ty', fvs)
+
+rnHsTypes doc tys = mapFvRn (rnHsType doc) tys
\end{code}
\begin{code}
-rnContext :: RdrNameContext -> RnMS s RenamedContext
+rnContext :: SDoc -> RdrNameContext -> RnMS (RenamedContext, FreeVars)
-rnContext ctxt
- = mapRn rn_ctxt ctxt `thenRn` \ result ->
+rnContext doc ctxt
+ = mapAndUnzipRn rn_ctxt ctxt `thenRn` \ (theta, fvs_s) ->
let
- (_, dup_asserts) = removeDups cmp_assert result
- (alls, theta) = partition (\(c,_) -> c == allClass_NAME) result
+ (_, dup_asserts) = removeDups cmp_assert theta
in
-
-- Check for duplicate assertions
-- If this isn't an error, then it ought to be:
- mapRn (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_`
+ mapRn_ (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_`
- -- Check for All constraining a non-type-variable
- mapRn check_All alls `thenRn_`
-
- -- Done. Return a theta omitting all the "All" constraints.
- -- They have done done their work by ensuring that we universally
- -- quantify over their tyvar.
- returnRn theta
+ returnRn (theta, plusFVs fvs_s)
where
rn_ctxt (clas, tys)
- = -- Mini hack here. If the class is our pseudo-class "All",
- -- then we don't want to record it as an occurrence, otherwise
- -- we try to slurp it in later and it doesn't really exist at all.
- -- Easiest thing is simply not to put it in the occurrence set.
- lookupBndrRn clas `thenRn` \ clas_name ->
- (if clas_name /= allClass_NAME then
- addOccurrenceName clas_name
- else
- returnRn clas_name
- ) `thenRn_`
- mapRn rnHsType tys `thenRn` \ tys' ->
- returnRn (clas_name, tys')
-
+ = lookupOccRn clas `thenRn` \ clas_name ->
+ rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
+ returnRn ((clas_name, tys'), fvs `addOneFV` clas_name)
cmp_assert (c1,tys1) (c2,tys2)
= (c1 `compare` c2) `thenCmp` (cmpHsTypes compare tys1 tys2)
-
- check_All (c, [MonoTyVar _]) = returnRn () -- OK!
- check_All assertion = addErrRn (wierdAllErr assertion)
\end{code}
%*********************************************************
-%* *
+%* *
\subsection{IdInfo}
-%* *
+%* *
%*********************************************************
\begin{code}
-rnIdInfo (HsStrictness strict)
- = rnStrict strict `thenRn` \ strict' ->
- returnRn (HsStrictness strict')
-
-rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (HsUnfold inline expr')
-rnIdInfo (HsArity arity) = returnRn (HsArity arity)
-rnIdInfo (HsUpdate update) = returnRn (HsUpdate update)
-rnIdInfo (HsFBType fb) = returnRn (HsFBType fb)
-rnIdInfo (HsArgUsage au) = returnRn (HsArgUsage au)
-
-rnStrict (HsStrictnessInfo demands (Just (worker,cons)))
- -- The sole purpose of the "cons" field is so that we can mark the constructors
- -- needed to build the wrapper as "needed", so that their data type decl will be
- -- slurped in. After that their usefulness is o'er, so we just put in the empty list.
- = lookupOccRn worker `thenRn` \ worker' ->
- mapRn lookupOccRn cons `thenRn_`
- returnRn (HsStrictnessInfo demands (Just (worker',[])))
+rnIdInfo (HsStrictness str) = returnRn (HsStrictness str, emptyFVs)
--- Boring, but necessary for the type checker.
-rnStrict (HsStrictnessInfo demands Nothing) = returnRn (HsStrictnessInfo demands Nothing)
-rnStrict HsBottom = returnRn HsBottom
+rnIdInfo (HsWorker worker)
+ = lookupOccRn worker `thenRn` \ worker' ->
+ returnRn (HsWorker worker', unitFV worker')
+
+rnIdInfo (HsUnfold inline (Just expr)) = rnCoreExpr expr `thenRn` \ (expr', fvs) ->
+ returnRn (HsUnfold inline (Just expr'), fvs)
+rnIdInfo (HsUnfold inline Nothing) = returnRn (HsUnfold inline Nothing, emptyFVs)
+rnIdInfo (HsArity arity) = returnRn (HsArity arity, emptyFVs)
+rnIdInfo (HsUpdate update) = returnRn (HsUpdate update, emptyFVs)
+rnIdInfo (HsNoCafRefs) = returnRn (HsNoCafRefs, emptyFVs)
+rnIdInfo (HsCprInfo cpr_info) = returnRn (HsCprInfo cpr_info, emptyFVs)
+rnIdInfo (HsSpecialise rule_body) = rnRuleBody rule_body
+ `thenRn` \ (rule_body', fvs) ->
+ returnRn (HsSpecialise rule_body', fvs)
+
+rnRuleBody (UfRuleBody str vars args rhs)
+ = rnCoreBndrs vars $ \ vars' ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn (UfRuleBody str vars' args' rhs', fvs1 `plusFV` fvs2)
\end{code}
-UfCore expressions.
+@UfCore@ expressions.
\begin{code}
+rnCoreExpr (UfType ty)
+ = rnHsType (text "unfolding type") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfType ty', fvs)
+
rnCoreExpr (UfVar v)
= lookupOccRn v `thenRn` \ v' ->
- returnRn (UfVar v')
-
-rnCoreExpr (UfLit lit) = returnRn (UfLit lit)
+ returnRn (UfVar v', unitFV v')
rnCoreExpr (UfCon con args)
- = lookupOccRn con `thenRn` \ con' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfCon con' args')
+ = rnUfCon con `thenRn` \ (con', fvs1) ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs2) ->
+ returnRn (UfCon con' args', fvs1 `plusFV` fvs2)
-rnCoreExpr (UfPrim prim args)
- = rnCorePrim prim `thenRn` \ prim' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfPrim prim' args')
+rnCoreExpr (UfTuple con args)
+ = lookupOccRn con `thenRn` \ con' ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs) ->
+ returnRn (UfTuple con' args', fvs `addOneFV` con')
rnCoreExpr (UfApp fun arg)
- = rnCoreExpr fun `thenRn` \ fun' ->
- rnCoreArg arg `thenRn` \ arg' ->
- returnRn (UfApp fun' arg')
-
-rnCoreExpr (UfCase scrut alts)
- = rnCoreExpr scrut `thenRn` \ scrut' ->
- rnCoreAlts alts `thenRn` \ alts' ->
- returnRn (UfCase scrut' alts')
+ = rnCoreExpr fun `thenRn` \ (fun', fv1) ->
+ rnCoreExpr arg `thenRn` \ (arg', fv2) ->
+ returnRn (UfApp fun' arg', fv1 `plusFV` fv2)
+
+rnCoreExpr (UfCase scrut bndr alts)
+ = rnCoreExpr scrut `thenRn` \ (scrut', fvs1) ->
+ bindCoreLocalFVRn bndr ( \ bndr' ->
+ mapFvRn rnCoreAlt alts `thenRn` \ (alts', fvs2) ->
+ returnRn (UfCase scrut' bndr' alts', fvs2)
+ ) `thenRn` \ (case', fvs3) ->
+ returnRn (case', fvs1 `plusFV` fvs3)
rnCoreExpr (UfNote note expr)
- = rnNote note `thenRn` \ note' ->
- rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (UfNote note' expr')
+ = rnNote note `thenRn` \ (note', fvs1) ->
+ rnCoreExpr expr `thenRn` \ (expr', fvs2) ->
+ returnRn (UfNote note' expr', fvs1 `plusFV` fvs2)
rnCoreExpr (UfLam bndr body)
= rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLam bndr' body')
+ rnCoreExpr body `thenRn` \ (body', fvs) ->
+ returnRn (UfLam bndr' body', fvs)
rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
- = rnCoreExpr rhs `thenRn` \ rhs' ->
- rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfNonRec bndr' rhs') body')
+ = rnCoreExpr rhs `thenRn` \ (rhs', fvs1) ->
+ rnCoreBndr bndr ( \ bndr' ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfNonRec bndr' rhs') body', fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
rnCoreExpr (UfLet (UfRec pairs) body)
= rnCoreBndrs bndrs $ \ bndrs' ->
- mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
+ mapFvRn rnCoreExpr rhss `thenRn` \ (rhss', fvs1) ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body', fvs1 `plusFV` fvs2)
where
(bndrs, rhss) = unzip pairs
\end{code}
\begin{code}
rnCoreBndr (UfValBinder name ty) thing_inside
- = rnHsType ty `thenRn` \ ty' ->
- bindLocalsRn "unfolding value" [name] $ \ [name'] ->
- thing_inside (UfValBinder name' ty')
+ = rnHsType doc ty `thenRn` \ (ty', fvs1) ->
+ bindCoreLocalFVRn name ( \ name' ->
+ thing_inside (UfValBinder name' ty')
+ ) `thenRn` \ (result, fvs2) ->
+ returnRn (result, fvs1 `plusFV` fvs2)
+ where
+ doc = text "unfolding id"
rnCoreBndr (UfTyBinder name kind) thing_inside
- = bindLocalsRn "unfolding tyvar" [name] $ \ [name'] ->
+ = bindCoreLocalFVRn name $ \ name' ->
thing_inside (UfTyBinder name' kind)
-rnCoreBndrs bndrs thing_inside -- Expect them all to be ValBinders
- = mapRn rnHsType tys `thenRn` \ tys' ->
- bindLocalsRn "unfolding value" names $ \ names' ->
- thing_inside (zipWith UfValBinder names' tys')
- where
- names = map (\ (UfValBinder name _) -> name) bndrs
- tys = map (\ (UfValBinder _ ty) -> ty) bndrs
-
-rnCoreBndrNamess names thing_inside
- = bindLocalsRn "unfolding value" names $ \ names' ->
- thing_inside names'
+rnCoreBndrs [] thing_inside = thing_inside []
+rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' ->
+ rnCoreBndrs bs $ \ names' ->
+ thing_inside (name':names')
\end{code}
\begin{code}
-rnCoreArg (UfVarArg v) = lookupOccRn v `thenRn` \ v' -> returnRn (UfVarArg v')
-rnCoreArg (UfTyArg ty) = rnHsType ty `thenRn` \ ty' -> returnRn (UfTyArg ty')
-rnCoreArg (UfLitArg lit) = returnRn (UfLitArg lit)
-
-rnCoreAlts (UfAlgAlts alts deflt)
- = mapRn rn_alt alts `thenRn` \ alts' ->
- rnCoreDefault deflt `thenRn` \ deflt' ->
- returnRn (UfAlgAlts alts' deflt')
- where
- rn_alt (con, bndrs, rhs) = lookupOccRn con `thenRn` \ con' ->
- bindLocalsRn "unfolding alt" bndrs $ \ bndrs' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (con', bndrs', rhs')
-
-rnCoreAlts (UfPrimAlts alts deflt)
- = mapRn rn_alt alts `thenRn` \ alts' ->
- rnCoreDefault deflt `thenRn` \ deflt' ->
- returnRn (UfPrimAlts alts' deflt')
- where
- rn_alt (lit, rhs) = rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (lit, rhs')
-
-rnCoreDefault UfNoDefault = returnRn UfNoDefault
-rnCoreDefault (UfBindDefault bndr rhs) = bindLocalsRn "unfolding default" [bndr] $ \ [bndr'] ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (UfBindDefault bndr' rhs')
+rnCoreAlt (con, bndrs, rhs)
+ = rnUfCon con `thenRn` \ (con', fvs1) ->
+ bindCoreLocalsFVRn bndrs ( \ bndrs' ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn ((con', bndrs', rhs'), fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
rnNote (UfCoerce ty)
- = rnHsType ty `thenRn` \ ty' ->
- returnRn (UfCoerce ty')
+ = rnHsType (text "unfolding coerce") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfCoerce ty', fvs)
+
+rnNote (UfSCC cc) = returnRn (UfSCC cc, emptyFVs)
+rnNote UfInlineCall = returnRn (UfInlineCall, emptyFVs)
+rnNote UfInlineMe = returnRn (UfInlineMe, emptyFVs)
+
+
+rnUfCon UfDefault
+ = returnRn (UfDefault, emptyFVs)
-rnNote (UfSCC cc) = returnRn (UfSCC cc)
-rnNote UfInlineCall = returnRn UfInlineCall
+rnUfCon (UfDataCon con)
+ = lookupOccRn con `thenRn` \ con' ->
+ returnRn (UfDataCon con', unitFV con')
+
+rnUfCon (UfLitCon lit)
+ = returnRn (UfLitCon lit, emptyFVs)
+
+rnUfCon (UfLitLitCon lit ty)
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfLitLitCon lit ty', fvs)
-rnCorePrim (UfOtherOp op)
- = lookupOccRn op `thenRn` \ op' ->
- returnRn (UfOtherOp op')
+rnUfCon (UfPrimOp op)
+ = lookupOccRn op `thenRn` \ op' ->
+ returnRn (UfPrimOp op', emptyFVs)
-rnCorePrim (UfCCallOp str casm gc arg_tys res_ty)
- = mapRn rnHsType arg_tys `thenRn` \ arg_tys' ->
- rnHsType res_ty `thenRn` \ res_ty' ->
- returnRn (UfCCallOp str casm gc arg_tys' res_ty')
+rnUfCon (UfCCallOp str is_dyn casm gc)
+ = returnRn (UfCCallOp str is_dyn casm gc, emptyFVs)
\end{code}
%*********************************************************
-%* *
+%* *
+\subsection{Rule shapes}
+%* *
+%*********************************************************
+
+Check the shape of a transformation rule LHS. Currently
+we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
+not one of the @forall@'d variables.
+
+\begin{code}
+validRuleLhs foralls lhs
+ = check lhs
+ where
+ check (HsApp e1 e2) = check e1
+ check (HsVar v) | v `notElem` foralls = True
+ check other = False
+\end{code}
+
+
+%*********************************************************
+%* *
\subsection{Errors}
-%* *
+%* *
%*********************************************************
\begin{code}
4 (ppr sig)
dupClassAssertWarn ctxt (assertion : dups)
- = sep [hsep [ptext SLIT("Duplicated class assertion"),
+ = sep [hsep [ptext SLIT("Duplicate class assertion"),
quotes (pprClassAssertion assertion),
ptext SLIT("in the context:")],
- nest 4 (pprContext ctxt)]
+ nest 4 (pprContext ctxt <+> ptext SLIT("..."))]
badDataCon name
= hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
-wierdAllErr assertion
- = ptext SLIT("Mal-formed use of `All':") <+> pprClassAssertion assertion
-
-ctxtErr1 doc tyvars
- = hsep [ptext SLIT("Context constrains in-scope type variable(s)"),
- pprQuotedList tyvars]
+forAllWarn doc ty tyvar
+ | not opt_WarnUnusedMatches = returnRn ()
+ | otherwise
+ = getModeRn `thenRn` \ mode ->
+ case mode of {
+#ifndef DEBUG
+ InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files
+ -- unless DEBUG is on, in which case it is slightly
+ -- informative. They can arise from mkRhsTyLam,
+#endif -- leading to (say) f :: forall a b. [b] -> [b]
+ other ->
+
+ addWarnRn (
+ sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ $$
+ (ptext SLIT("In") <+> doc))
+ }
+
+forAllErr doc ty tyvar
+ = addErrRn (
+ sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ $$
+ (ptext SLIT("In") <+> doc))
+
+ctxtErr explicit_forall doc tyvars constraint ty
+ = sep [ptext SLIT("None of the type variable(s) in the constraint")
+ <+> quotes (pprClassAssertion constraint),
+ if explicit_forall then
+ nest 4 (ptext SLIT("is universally quantified (i.e. bound by the forall)"))
+ else
+ nest 4 (ptext SLIT("appears in the type") <+> quotes (ppr ty))
+ ]
$$
- nest 4 (ptext SLIT("in") <+> doc)
+ (ptext SLIT("In") <+> doc)
-ctxtErr2 doc tyvars ty
- = (ptext SLIT("Context constrains type variable(s)")
- <+> pprQuotedList tyvars)
+badRuleLhsErr name lhs
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)]
$$
- nest 4 (vcat [ptext SLIT("that do not appear in") <+> quotes (ppr ty),
- ptext SLIT("in") <+> doc])
+ ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
+
+badRuleVar name var
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
+ ptext SLIT("does not appear on left hand side")]
\end{code}
projects / ghc-hetmet.git / blobdiff