%
-% (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 (
+ rnSrcDecls, checkModDeprec,
+ rnTyClDecl, rnIfaceRuleDecl, rnInstDecl,
+ rnBinds, rnBindsAndThen, rnStats,
+ ) 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, elemRdrEnv )
+import RdrHsSyn ( RdrNameConDecl, RdrNameTyClDecl,
+ RdrNameDeprecation, RdrNameFixitySig,
+ RdrNameHsBinds,
+ extractGenericPatTyVars
+ )
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 RnMonad
-
-import Name ( Name, OccName(..), occNameString, prefixOccName,
- ExportFlag(..), Provenance(..), NameSet,
- elemNameSet
+import RnExpr ( rnExpr )
+import RnTypes ( rnHsType, rnHsSigType, rnHsTypeFVs, rnContext )
+
+import RnBinds ( rnTopMonoBinds, rnMonoBinds, rnMethodBinds,
+ rnMonoBindsAndThen, renameSigs, checkSigs )
+import RnEnv ( lookupTopBndrRn, lookupOccRn, lookupSysBndr,
+ newLocalsRn, lookupGlobalOccRn,
+ bindLocalsFVRn, bindPatSigTyVars,
+ bindTyVarsRn, extendTyVarEnvFVRn,
+ bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames,
+ checkDupOrQualNames, checkDupNames, mapFvRn,
+ lookupTopSrcBndr_maybe, lookupTopSrcBndr,
+ dataTcOccs, newIPName, unknownNameErr
)
-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 TcRnMonad
+
+import BasicTypes ( FixitySig(..) )
+import HscTypes ( ExternalPackageState(..), FixityEnv,
+ Deprecations(..), plusDeprecs )
+import Module ( moduleEnvElts )
+import Class ( FunDep, DefMeth (..) )
+import TyCon ( DataConDetails(..), visibleDataCons )
+import Name ( Name )
+import NameSet
+import NameEnv
+import ErrUtils ( dumpIfSet )
+import PrelNames ( newStablePtrName, bindIOName, returnIOName )
+import List ( partition )
import Bag ( bagToList )
import Outputable
import SrcLoc ( SrcLoc )
-import Unique ( Unique )
-import UniqSet ( UniqSet )
-import UniqFM ( UniqFM, lookupUFM )
-import Util
-import List ( partition, nub )
+import CmdLineOpts ( DynFlag(..) )
+ -- Warn of unused for-all'd tyvars
+import Maybes ( maybeToBool, seqMaybe )
+import Maybe ( maybe, catMaybes, isNothing )
\end{code}
-rnDecl `renames' declarations.
+@rnSourceDecl@ `renames' declarations.
It simultaneously performs dependency analysis and precedence parsing.
It also does the following error checks:
\begin{enumerate}
\item
Checks that tyvars are used properly. This includes checking
for undefined tyvars, and tyvars in contexts that are ambiguous.
+(Some of this checking has now been moved to module @TcMonoType@,
+since we don't have functional dependency information at this point.)
\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}
+rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name, FreeVars)
+
+rnSrcDecls (HsGroup { hs_valds = MonoBind binds sigs _,
+ hs_tyclds = tycl_decls,
+ hs_instds = inst_decls,
+ hs_fixds = fix_decls,
+ hs_depds = deprec_decls,
+ hs_fords = foreign_decls,
+ hs_defds = default_decls,
+ hs_ruleds = rule_decls,
+ hs_coreds = core_decls })
+
+ = do { -- Deal with deprecations (returns only the extra deprecations)
+ deprecs <- rnSrcDeprecDecls deprec_decls ;
+ updGblEnv (\gbl -> gbl { tcg_deprecs = tcg_deprecs gbl `plusDeprecs` deprecs })
+ $ do {
+
+ -- Deal with top-level fixity decls
+ -- (returns the total new fixity env)
+ fix_env <- rnSrcFixityDecls fix_decls ;
+ updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env })
+ $ do {
+
+ -- Rename other declarations
+ (rn_val_decls, src_fvs1) <- rnTopMonoBinds binds sigs ;
+ (rn_inst_decls, src_fvs2) <- mapFvRn rnSrcInstDecl inst_decls ;
+ (rn_tycl_decls, src_fvs3) <- mapFvRn rnSrcTyClDecl tycl_decls ;
+ (rn_rule_decls, src_fvs4) <- mapFvRn rnHsRuleDecl rule_decls ;
+ (rn_foreign_decls, src_fvs5) <- mapFvRn rnHsForeignDecl foreign_decls ;
+ (rn_default_decls, src_fvs6) <- mapFvRn rnDefaultDecl default_decls ;
+ (rn_core_decls, src_fvs7) <- mapFvRn rnCoreDecl core_decls ;
+
+ let {
+ rn_group = HsGroup { hs_valds = rn_val_decls,
+ hs_tyclds = rn_tycl_decls,
+ hs_instds = rn_inst_decls,
+ hs_fixds = [],
+ hs_depds = [],
+ hs_fords = rn_foreign_decls,
+ hs_defds = rn_default_decls,
+ hs_ruleds = rn_rule_decls,
+ hs_coreds = rn_core_decls } ;
+ src_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3, src_fvs4,
+ src_fvs5, src_fvs6, src_fvs7] } ;
+
+ traceRn (text "rnSrcDecls" <+> ppr (nameSetToList src_fvs)) ;
+ tcg_env <- getGblEnv ;
+ return (tcg_env, rn_group, src_fvs)
+ }}}
+\end{code}
+
+
%*********************************************************
-%* *
-\subsection{Value declarations}
-%* *
+%* *
+ Source-code fixity declarations
+%* *
%*********************************************************
\begin{code}
-rnDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl
+rnSrcFixityDecls :: [RdrNameFixitySig] -> TcRn m FixityEnv
+rnSrcFixityDecls fix_decls
+ = getGblEnv `thenM` \ gbl_env ->
+ foldlM rnFixityDecl (tcg_fix_env gbl_env)
+ fix_decls `thenM` \ fix_env ->
+ traceRn (text "fixity env" <+> ppr fix_env) `thenM_`
+ returnM fix_env
+
+rnFixityDecl :: FixityEnv -> RdrNameFixitySig -> TcRn m FixityEnv
+rnFixityDecl fix_env (FixitySig rdr_name fixity loc)
+ = -- GHC extension: look up both the tycon and data con
+ -- for con-like things
+ -- If neither are in scope, report an error; otherwise
+ -- add both to the fixity env
+ mappM lookupTopSrcBndr_maybe (dataTcOccs rdr_name) `thenM` \ maybe_ns ->
+ case catMaybes maybe_ns of
+ [] -> addSrcLoc loc $
+ addErr (unknownNameErr rdr_name) `thenM_`
+ returnM fix_env
+ ns -> foldlM add fix_env ns
+ where
+ add fix_env name
+ = case lookupNameEnv fix_env name of
+ Just (FixitySig _ _ loc') -> addErr (dupFixityDecl rdr_name loc loc') `thenM_`
+ returnM fix_env
+ Nothing -> returnM (extendNameEnv fix_env name (FixitySig name fixity loc))
+
+dupFixityDecl rdr_name loc1 loc2
+ = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
+ ptext SLIT("at ") <+> ppr loc1,
+ ptext SLIT("and") <+> ppr loc2]
+\end{code}
-rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ new_binds ->
- returnRn (ValD new_binds)
+%*********************************************************
+%* *
+ Source-code deprecations declarations
+%* *
+%*********************************************************
-rnDecl (SigD (IfaceSig name ty id_infos loc))
- = pushSrcLocRn loc $
- lookupBndrRn name `thenRn` \ name' ->
- rnHsType ty `thenRn` \ ty' ->
+For deprecations, all we do is check that the names are in scope.
+It's only imported deprecations, dealt with in RnIfaces, that we
+gather them together.
- -- 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))
+\begin{code}
+rnSrcDeprecDecls :: [RdrNameDeprecation] -> TcRn m Deprecations
+rnSrcDeprecDecls []
+ = returnM NoDeprecs
+
+rnSrcDeprecDecls decls
+ = mappM rn_deprec decls `thenM` \ pairs ->
+ returnM (DeprecSome (mkNameEnv (catMaybes pairs)))
+ where
+ rn_deprec (Deprecation rdr_name txt loc)
+ = addSrcLoc loc $
+ lookupTopSrcBndr rdr_name `thenM` \ name ->
+ returnM (Just (name, (name,txt)))
+
+checkModDeprec :: Maybe DeprecTxt -> Deprecations
+-- Check for a module deprecation; done once at top level
+checkModDeprec Nothing = NoDeprecs
+checkModdeprec (Just txt) = DeprecAll txt
+
+badDeprec d
+ = sep [ptext SLIT("Illegal deprecation when whole module is deprecated"),
+ nest 4 (ppr d)]
\end{code}
%*********************************************************
%* *
-\subsection{Type declarations}
+\subsection{Source code declarations}
%* *
%*********************************************************
-@rnTyDecl@ uses the `global name function' to create a new type
-declaration in which local names have been replaced by their original
-names, reporting any unknown names.
-
-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.
-
\begin{code}
-rnDecl (TyD (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' ->
- ASSERT(isNoDataPragmas pragmas)
- returnRn (TyD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc))
+rnSrcTyClDecl tycl_decl
+ = rnTyClDecl tycl_decl `thenM` \ new_decl ->
+ finishSourceTyClDecl tycl_decl new_decl `thenM` \ (new_decl', fvs) ->
+ returnM (new_decl', fvs `plusFV` tyClDeclFVs new_decl')
+
+rnSrcInstDecl inst
+ = rnInstDecl inst `thenM` \ new_inst ->
+ finishSourceInstDecl inst new_inst `thenM` \ (new_inst', fvs) ->
+ returnM (new_inst', fvs `plusFV` instDeclFVs new_inst')
+
+rnDefaultDecl (DefaultDecl tys src_loc)
+ = addSrcLoc src_loc $
+ mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) ->
+ returnM (DefaultDecl tys' src_loc, fvs)
where
- data_doc = text "the data type declaration for" <+> ppr tycon
- con_names = map conDeclName condecls
+ doc_str = text "In a `default' declaration"
-rnDecl (TyD (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))
+
+rnCoreDecl (CoreDecl name ty rhs loc)
+ = addSrcLoc loc $
+ lookupTopBndrRn name `thenM` \ name' ->
+ rnHsTypeFVs doc_str ty `thenM` \ (ty', ty_fvs) ->
+ rnCoreExpr rhs `thenM` \ rhs' ->
+ returnM (CoreDecl name' ty' rhs' loc,
+ ty_fvs `plusFV` ufExprFVs rhs')
where
- syn_doc = text "the declaration for type synonym" <+> ppr name
+ doc_str = text "In the Core declaration for" <+> quotes (ppr name)
\end{code}
%*********************************************************
%* *
-\subsection{Class declarations}
+ Bindings
%* *
%*********************************************************
-@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.
+These chaps are here, rather than in TcBinds, so that there
+is just one hi-boot file (for RnSource). rnSrcDecls is part
+of the loop too, and it must be defined in this module.
\begin{code}
-rnDecl (ClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname src_loc))
- = pushSrcLocRn src_loc $
+rnTopBinds :: RdrNameHsBinds -> RnM (RenamedHsBinds, FreeVars)
+rnTopBinds EmptyBinds = returnM (EmptyBinds, emptyFVs)
+rnTopBinds (MonoBind bind sigs _) = rnTopMonoBinds bind sigs
+ -- The parser doesn't produce other forms
+
+rnBinds :: RdrNameHsBinds -> RnM (RenamedHsBinds, FreeVars)
+-- This version assumes that the binders are already in scope
+-- It's used only in 'mdo'
+rnBinds EmptyBinds = returnM (EmptyBinds, emptyFVs)
+rnBinds (MonoBind bind sigs _) = rnMonoBinds bind sigs
+rnBinds b@(IPBinds bind _) = addErr (badIpBinds b) `thenM_`
+ returnM (EmptyBinds, emptyFVs)
+
+rnBindsAndThen :: RdrNameHsBinds
+ -> (RenamedHsBinds -> RnM (result, FreeVars))
+ -> RnM (result, FreeVars)
+-- This version (a) assumes that the binding vars are not already in scope
+-- (b) removes the binders from the free vars of the thing inside
+-- The parser doesn't produce ThenBinds
+rnBindsAndThen EmptyBinds thing_inside = thing_inside EmptyBinds
+rnBindsAndThen (MonoBind bind sigs _) thing_inside = rnMonoBindsAndThen bind sigs thing_inside
+rnBindsAndThen (IPBinds binds is_with) thing_inside
+ = warnIf is_with withWarning `thenM_`
+ rnIPBinds binds `thenM` \ (binds',fv_binds) ->
+ thing_inside (IPBinds binds' is_with) `thenM` \ (thing, fvs_thing) ->
+ returnM (thing, fvs_thing `plusFV` fv_binds)
+\end{code}
- lookupBndrRn cname `thenRn` \ cname' ->
- lookupBndrRn tname `thenRn` \ tname' ->
- lookupBndrRn dname `thenRn` \ dname' ->
- bindTyVarsRn cls_doc tyvars ( \ tyvars' ->
- rnContext context `thenRn` \ context' ->
+%************************************************************************
+%* *
+\subsubsection{@rnIPBinds@s: in implicit parameter bindings} *
+%* *
+%************************************************************************
- -- 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') ->
+\begin{code}
+rnIPBinds [] = returnM ([], emptyFVs)
+rnIPBinds ((n, expr) : binds)
+ = newIPName n `thenM` \ name ->
+ rnExpr expr `thenM` \ (expr',fvExpr) ->
+ rnIPBinds binds `thenM` \ (binds',fvBinds) ->
+ returnM ((name, expr') : binds', fvExpr `plusFV` fvBinds)
- -- Check the methods
- checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
+\end{code}
- -- Typechecker is responsible for checking that we only
- -- give default-method bindings for things in this class.
- -- The renamer *could* check this for class decls, but can't
- -- for instance decls.
- ASSERT(isNoClassPragmas pragmas)
- returnRn (ClD (ClassDecl context' cname' tyvars' sigs' mbinds' NoClassPragmas tname' dname' src_loc))
+%*********************************************************
+%* *
+\subsection{Foreign declarations}
+%* *
+%*********************************************************
+
+\begin{code}
+rnHsForeignDecl (ForeignImport name ty spec isDeprec src_loc)
+ = addSrcLoc src_loc $
+ lookupTopBndrRn name `thenM` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
+ returnM (ForeignImport name' ty' spec isDeprec src_loc,
+ fvs `plusFV` extras spec)
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
-
- sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
- meth_rdr_names_w_locs = bagToList (collectMonoBinders mbinds)
- meth_rdr_names = map fst meth_rdr_names_w_locs
-
- 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 ->
-
- -- Make the default-method name
- let
- dm_occ = prefixOccName SLIT("$m") (rdrNameOcc op)
- 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)
-
- (InterfaceMode _ _, Just _)
- -> -- 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)
+ extras (CImport _ _ _ _ CWrapper) = mkFVs [newStablePtrName,
+ bindIOName, returnIOName]
+ extras _ = emptyFVs
+
+rnHsForeignDecl (ForeignExport name ty spec isDeprec src_loc)
+ = addSrcLoc src_loc $
+ lookupOccRn name `thenM` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
+ returnM (ForeignExport name' ty' spec isDeprec src_loc,
+ mkFVs [name', bindIOName, returnIOName] `plusFV` fvs )
+ -- NB: a foreign export is an *occurrence site* for name, so
+ -- we add it to the free-variable list. It might, for example,
+ -- be imported from another module
+
+fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name
\end{code}
%*********************************************************
\begin{code}
-rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun src_loc))
- = pushSrcLocRn src_loc $
- rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
-
+rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)
+ -- Used for both source and interface file decls
+ = addSrcLoc src_loc $
+ rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' ->
+
+ (case maybe_dfun_rdr_name of
+ Nothing -> returnM Nothing
+ Just dfun_rdr_name -> lookupGlobalOccRn dfun_rdr_name `thenM` \ dfun_name ->
+ returnM (Just dfun_name)
+ ) `thenM` \ maybe_dfun_name ->
+
+ -- The typechecker checks that all the bindings are for the right class.
+ returnM (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc)
+
+-- Compare finishSourceTyClDecl
+finishSourceInstDecl (InstDecl _ mbinds uprags _ _ )
+ (InstDecl inst_ty _ _ maybe_dfun_name src_loc)
+ -- Used for both source decls only
+ = ASSERT( not (maybeToBool maybe_dfun_name) ) -- Source decl!
+ let
+ meth_doc = text "In the bindings in an instance declaration"
+ meth_names = collectLocatedMonoBinders mbinds
+ (inst_tyvars, _, cls,_) = splitHsInstDeclTy inst_ty
+ -- (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 ->
-
- newDfunName 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
-
- -- 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))
- where
- meth_doc = text "the bindings in an instance declaration"
- meth_names = bagToList (collectMonoBinders mbinds)
-
- 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)
-
- rn_uprag (InlineSig op locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (InlineSig op_name locn)
-
- rn_uprag (MagicUnfoldingSig op str locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (MagicUnfoldingSig op_name str locn)
-
- rn_using Nothing = returnRn Nothing
- rn_using (Just v) = lookupOccRn v `thenRn` \ new_v ->
- returnRn (Just new_v)
+ checkDupNames meth_doc meth_names `thenM_`
+ extendTyVarEnvForMethodBinds inst_tyvars (
+ rnMethodBinds cls [] mbinds
+ ) `thenM` \ (mbinds', meth_fvs) ->
+ let
+ binders = collectMonoBinders mbinds'
+ in
+ -- 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.
+ --
+ -- But the (unqualified) method names are in scope
+ bindLocalNames binders (renameSigs uprags) `thenM` \ uprags' ->
+ checkSigs okInstDclSig (mkNameSet binders) uprags' `thenM_`
+
+ returnM (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc,
+ meth_fvs `plusFV` hsSigsFVs uprags')
\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))
+rnIfaceRuleDecl (IfaceRule rule_name act vars fn args rhs src_loc)
+ = addSrcLoc src_loc $
+ lookupOccRn fn `thenM` \ fn' ->
+ rnCoreBndrs vars $ \ vars' ->
+ mappM rnCoreExpr args `thenM` \ args' ->
+ rnCoreExpr rhs `thenM` \ rhs' ->
+ returnM (IfaceRule rule_name act vars' fn' args' rhs' src_loc)
+
+rnIfaceRuleDecl (IfaceRuleOut fn rule) -- Builtin rules come this way
+ = lookupOccRn fn `thenM` \ fn' ->
+ returnM (IfaceRuleOut fn' rule)
+
+rnHsRuleDecl (HsRule rule_name act vars lhs rhs src_loc)
+ = addSrcLoc src_loc $
+ bindPatSigTyVars (collectRuleBndrSigTys vars) $
+
+ bindLocalsFVRn doc (map get_var vars) $ \ ids ->
+ mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) ->
+
+ rnExpr lhs `thenM` \ (lhs', fv_lhs) ->
+ rnExpr rhs `thenM` \ (rhs', fv_rhs) ->
+ let
+ mb_bad = validRuleLhs ids lhs'
+ in
+ checkErr (isNothing mb_bad)
+ (badRuleLhsErr rule_name lhs' mb_bad) `thenM_`
+ let
+ bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
+ in
+ mappM (addErr . badRuleVar rule_name) bad_vars `thenM_`
+ returnM (HsRule rule_name act vars' lhs' rhs' src_loc,
+ fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
+ where
+ doc = text "In the transformation rule" <+> ftext rule_name
+
+ get_var (RuleBndr v) = v
+ get_var (RuleBndrSig v _) = v
+
+ rn_var (RuleBndr v, id) = returnM (RuleBndr id, emptyFVs)
+ rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenM` \ (t', fvs) ->
+ returnM (RuleBndrSig id t', fvs)
\end{code}
+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. We also restrict the form of the LHS so
+that it may be plausibly matched. Basically you only get to write ordinary
+applications. (E.g. a case expression is not allowed: too elaborate.)
+
+NB: if you add new cases here, make sure you add new ones to TcRule.ruleLhsTvs
+
+\begin{code}
+validRuleLhs :: [Name] -> RenamedHsExpr -> Maybe RenamedHsExpr
+-- Nothing => OK
+-- Just e => Not ok, and e is the offending expression
+validRuleLhs foralls lhs
+ = check lhs
+ where
+ check (OpApp e1 op _ e2) = check op `seqMaybe` check_e e1 `seqMaybe` check_e e2
+ check (HsApp e1 e2) = check e1 `seqMaybe` check_e e2
+ check (HsVar v) | v `notElem` foralls = Nothing
+ check other = Just other -- Failure
+
+ check_e (HsVar v) = Nothing
+ check_e (HsPar e) = check_e e
+ check_e (HsLit e) = Nothing
+ check_e (HsOverLit e) = Nothing
+
+ check_e (OpApp e1 op _ e2) = check_e e1 `seqMaybe` check_e op `seqMaybe` check_e e2
+ check_e (HsApp e1 e2) = check_e e1 `seqMaybe` check_e e2
+ check_e (NegApp e _) = check_e e
+ check_e (ExplicitList _ es) = check_es es
+ check_e (ExplicitTuple es _) = check_es es
+ check_e other = Just other -- Fails
+
+ check_es es = foldr (seqMaybe . check_e) Nothing es
+\end{code}
+
+
%*********************************************************
%* *
-\subsection{Support code for type/data declarations}
+\subsection{Type, class and iface sig declarations}
%* *
%*********************************************************
+@rnTyDecl@ uses the `global name function' to create a new type
+declaration in which local names have been replaced by their original
+names, reporting any unknown names.
+
+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.
+
\begin{code}
-rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name])
+rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc})
+ = addSrcLoc loc $
+ lookupTopBndrRn name `thenM` \ name' ->
+ rnHsType doc_str ty `thenM` \ ty' ->
+ mappM rnIdInfo id_infos `thenM` \ id_infos' ->
+ returnM (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc})
+ where
+ doc_str = text "In the interface signature for" <+> quotes (ppr name)
+
+rnTyClDecl (ForeignType {tcdName = name, tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
+ = addSrcLoc loc $
+ lookupTopBndrRn name `thenM` \ name' ->
+ returnM (ForeignType {tcdName = name', tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
+
+rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon,
+ tcdTyVars = tyvars, tcdCons = condecls, tcdGeneric = want_generic,
+ tcdDerivs = derivs, tcdLoc = src_loc})
+ = addSrcLoc src_loc $
+ lookupTopBndrRn tycon `thenM` \ tycon' ->
+ bindTyVarsRn data_doc tyvars $ \ tyvars' ->
+ rnContext data_doc context `thenM` \ context' ->
+ rn_derivs derivs `thenM` \ derivs' ->
+ checkDupOrQualNames data_doc con_names `thenM_`
+
+ rnConDecls tycon' condecls `thenM` \ condecls' ->
+ returnM (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon',
+ tcdTyVars = tyvars', tcdCons = condecls', tcdGeneric = want_generic,
+ tcdDerivs = derivs', tcdLoc = src_loc})
+ where
+ data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
+ con_names = map conDeclName (visibleDataCons condecls)
+
+ rn_derivs Nothing = returnM Nothing
+ rn_derivs (Just ds) = rnContext data_doc ds `thenM` \ ds' -> returnM (Just ds')
+
+rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc})
+ = addSrcLoc src_loc $
+ lookupTopBndrRn name `thenM` \ name' ->
+ bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
+ rnHsType syn_doc ty `thenM` \ ty' ->
+ returnM (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc})
+ where
+ syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name)
+
+rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname,
+ tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
+ tcdLoc = src_loc})
+ -- Used for both source and interface file decls
+ = addSrcLoc src_loc $
+
+ lookupTopBndrRn cname `thenM` \ cname' ->
+
+ -- Tyvars scope over superclass context and method signatures
+ bindTyVarsRn cls_doc tyvars $ \ tyvars' ->
+
+ -- Check the superclasses
+ rnContext cls_doc context `thenM` \ context' ->
+
+ -- Check the functional dependencies
+ rnFds cls_doc fds `thenM` \ fds' ->
+
+ -- Check the signatures
+ -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
+ let
+ (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
+ in
+ checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenM_`
+ mappM (rnClassOp cname' fds') op_sigs `thenM` \ sigs' ->
+ let
+ binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
+ in
+ renameSigs non_op_sigs `thenM` \ non_ops' ->
+ checkSigs okClsDclSig binders non_ops' `thenM_`
+ -- Typechecker is responsible for checking that we only
+ -- give default-method bindings for things in this class.
+ -- The renamer *could* check this for class decls, but can't
+ -- for instance decls.
-rnDerivs Nothing -- derivs not specified
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- returnRn Nothing
+ returnM (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars',
+ tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing,
+ tcdLoc = src_loc})
+ where
+ cls_doc = text "In the declaration for class" <+> ppr cname
+ sig_doc = text "In the signatures for class" <+> ppr cname
-rnDerivs (Just ds)
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- mapRn rn_deriv ds `thenRn` \ derivs ->
- returnRn (Just derivs)
+rnClassOp clas clas_fds sig@(ClassOpSig op dm_stuff ty locn)
+ = addSrcLoc locn $
+ lookupTopBndrRn op `thenM` \ op_name ->
+
+ -- Check the signature
+ rnHsSigType (quotes (ppr op)) ty `thenM` \ new_ty ->
+
+ -- Make the default-method name
+ (case dm_stuff of
+ DefMeth dm_rdr_name
+ -> -- Imported class that has a default method decl
+ lookupSysBndr dm_rdr_name `thenM` \ dm_name ->
+ returnM (DefMeth dm_name)
+ -- An imported class decl for a class decl that had an explicit default
+ -- method, mentions, rather than defines,
+ -- the default method, so we must arrange to pull it in
+
+ GenDefMeth -> returnM GenDefMeth
+ NoDefMeth -> returnM NoDefMeth
+ ) `thenM` \ dm_stuff' ->
+
+ returnM (ClassOpSig op_name dm_stuff' new_ty locn)
+
+finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnM (RenamedTyClDecl, FreeVars)
+ -- Used for source file decls only
+ -- Renames the default-bindings of a class decl
+finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here
+ rn_cls_decl@(ClassDecl {tcdName = cls, tcdTyVars = tyvars}) -- Everything else is here
+ -- There are some default-method bindings (abeit possibly empty) so
+ -- this is a source-code class declaration
+ = -- The newLocals call is tiresome: given a generic class decl
+ -- class C a where
+ -- op :: a -> a
+ -- op {| x+y |} (Inl a) = ...
+ -- op {| x+y |} (Inr b) = ...
+ -- op {| a*b |} (a*b) = ...
+ -- we want to name both "x" tyvars with the same unique, so that they are
+ -- easy to group together in the typechecker.
+ -- Hence the
+ addSrcLoc src_loc $
+ extendTyVarEnvForMethodBinds tyvars $
+ getLocalRdrEnv `thenM` \ name_env ->
+ let
+ meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
+ gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
+ not (tv `elemRdrEnv` name_env)]
+ in
+ checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenM_`
+ newLocalsRn gen_rdr_tyvars_w_locs `thenM` \ gen_tyvars ->
+ rnMethodBinds cls gen_tyvars mbinds `thenM` \ (mbinds', meth_fvs) ->
+ returnM (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs)
where
- rn_deriv clas
- = lookupOccRn clas `thenRn` \ clas_name ->
-
- -- Now add extra "occurrences" for things that
- -- the deriving mechanism will later need in order to
- -- generate code for this class.
- case lookupUFM derivingOccurrences clas_name of
- Nothing -> addErrRn (derivingNonStdClassErr clas_name) `thenRn_`
- returnRn clas_name
-
- Just occs -> mapRn lookupImplicitOccRn occs `thenRn_`
- returnRn clas_name
+ meth_doc = text "In the default-methods for class" <+> ppr (tcdName rn_cls_decl)
+
+finishSourceTyClDecl _ tycl_decl@(TyData {tcdDerivs = derivings})
+ -- Derivings are returned here so that they don't form part of the tyClDeclFVs.
+ -- This is important, because tyClDeclFVs should contain only the
+ -- FVs that are `needed' by the interface file declaration, and
+ -- derivings do not appear in this. It also means that the tcGroups
+ -- are smaller, which turned out to be important for the usage inference. KSW 2002-02.
+ = returnM (tycl_decl,
+ maybe emptyFVs extractHsCtxtTyNames derivings)
+
+finishSourceTyClDecl _ tycl_decl = returnM (tycl_decl, emptyFVs)
+ -- Not a class declaration
\end{code}
+For the method bindings in class and instance decls, we extend the
+type variable environment iff -fglasgow-exts
+
+\begin{code}
+extendTyVarEnvForMethodBinds tyvars thing_inside
+ = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts ->
+ if opt_GlasgowExts then
+ extendTyVarEnvFVRn (map hsTyVarName tyvars) thing_inside
+ else
+ thing_inside
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Support code for type/data declarations}
+%* *
+%*********************************************************
+
\begin{code}
conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
-conDeclName (ConDecl n _ _ l) = (n,l)
-
-rnConDecl :: RdrNameConDecl -> RnMS s RenamedConDecl
-rnConDecl (ConDecl name 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)
+conDeclName (ConDecl n _ _ _ l) = (n,l)
+
+rnConDecls :: Name -> DataConDetails RdrNameConDecl -> RnM (DataConDetails RenamedConDecl)
+rnConDecls tycon Unknown = returnM Unknown
+rnConDecls tycon (HasCons n) = returnM (HasCons n)
+rnConDecls tycon (DataCons condecls)
+ = -- Check that there's at least one condecl,
+ -- or else we're reading an interface file, or -fglasgow-exts
+ (if null condecls then
+ doptM Opt_GlasgowExts `thenM` \ glaExts ->
+ getModeRn `thenM` \ mode ->
+ checkErr (glaExts || isInterfaceMode mode)
+ (emptyConDeclsErr tycon)
+ else returnM ()
+ ) `thenM_`
+
+ mappM rnConDecl condecls `thenM` \ condecls' ->
+ returnM (DataCons condecls')
+
+rnConDecl :: RdrNameConDecl -> RnM RenamedConDecl
+rnConDecl (ConDecl name tvs cxt details locn)
+ = addSrcLoc locn $
+ checkConName name `thenM_`
+ lookupTopBndrRn name `thenM` \ new_name ->
+
+ bindTyVarsRn doc tvs $ \ new_tyvars ->
+ rnContext doc cxt `thenM` \ new_context ->
+ rnConDetails doc locn details `thenM` \ new_details ->
+ returnM (ConDecl new_name new_tyvars new_context new_details locn)
where
- fld_doc = text "the fields of constructor" <> ppr con
- field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
+ doc = text "In the definition of data constructor" <+> quotes (ppr name)
+
+rnConDetails doc locn (PrefixCon tys)
+ = mappM (rnBangTy doc) tys `thenM` \ new_tys ->
+ returnM (PrefixCon new_tys)
-rnField (names, ty)
- = mapRn lookupBndrRn names `thenRn` \ new_names ->
- rnBangTy ty `thenRn` \ new_ty ->
- returnRn (new_names, new_ty)
+rnConDetails doc locn (InfixCon ty1 ty2)
+ = rnBangTy doc ty1 `thenM` \ new_ty1 ->
+ rnBangTy doc ty2 `thenM` \ new_ty2 ->
+ returnM (InfixCon new_ty1 new_ty2)
-rnBangTy (Banged ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (Banged new_ty)
+rnConDetails doc locn (RecCon fields)
+ = checkDupOrQualNames doc field_names `thenM_`
+ mappM (rnField doc) fields `thenM` \ new_fields ->
+ returnM (RecCon new_fields)
+ where
+ field_names = [(fld, locn) | (fld, _) <- fields]
+
+rnField doc (name, ty)
+ = lookupTopBndrRn name `thenM` \ new_name ->
+ rnBangTy doc ty `thenM` \ new_ty ->
+ returnM (new_name, new_ty)
-rnBangTy (Unbanged ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (Unbanged new_ty)
+rnBangTy doc (BangType s ty)
+ = rnHsType doc ty `thenM` \ new_ty ->
+ returnM (BangType s new_ty)
-- 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)))
- (badDataCon name)
+ = checkErr (isRdrDataCon name) (badDataCon name)
\end{code}
%*********************************************************
\begin{code}
-rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType
- -- 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)
- = 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)
+rnFds :: SDoc -> [FunDep RdrName] -> RnM [FunDep Name]
- 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 = []
- 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)
- )
+rnFds doc fds
+ = mappM rn_fds fds
where
- sig_doc = text "the type signature for" <+> doc_str
-
+ rn_fds (tys1, tys2)
+ = rnHsTyVars doc tys1 `thenM` \ tys1' ->
+ rnHsTyVars doc tys2 `thenM` \ tys2' ->
+ returnM (tys1', tys2')
-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
- in
- rn_poly_help (map UserTyVar forall_tyvars) ctxt ty
-
-rnHsType (MonoTyVar tyvar)
- = lookupOccRn tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar')
-
-rnHsType (MonoFunTy ty1 ty2)
- = andRn MonoFunTy (rnHsType ty1) (rnHsType ty2)
-
-rnHsType (MonoListTy _ ty)
- = lookupImplicitOccRn listType_RDR `thenRn` \ tycon_name ->
- rnHsType ty `thenRn` \ ty' ->
- returnRn (MonoListTy tycon_name ty')
-
-rnHsType (MonoTupleTy _ tys)
- = lookupImplicitOccRn (tupleType_RDR (length tys)) `thenRn` \ tycon_name ->
- mapRn rnHsType tys `thenRn` \ tys' ->
- returnRn (MonoTupleTy tycon_name tys')
-
-rnHsType (MonoTyApp ty1 ty2)
- = rnHsType ty1 `thenRn` \ ty1' ->
- rnHsType ty2 `thenRn` \ ty2' ->
- returnRn (MonoTyApp ty1' ty2')
-
-rnHsType (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"
+rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs
+rnHsTyvar doc tyvar = lookupOccRn tyvar
\end{code}
-
-\begin{code}
-rnContext :: RdrNameContext -> RnMS s RenamedContext
-
-rnContext ctxt
- = mapRn rn_ctxt ctxt `thenRn` \ result ->
- let
- (_, dup_asserts) = removeDups cmp_assert result
- (alls, theta) = partition (\(c,_) -> c == allClass_NAME) result
- in
-
- -- Check for duplicate assertions
- -- If this isn't an error, then it ought to be:
- 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
- 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')
-
-
- 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',[])))
-
--- Boring, but necessary for the type checker.
-rnStrict (HsStrictnessInfo demands Nothing) = returnRn (HsStrictnessInfo demands Nothing)
-rnStrict HsBottom = returnRn HsBottom
+rnIdInfo (HsWorker worker arity)
+ = lookupOccRn worker `thenM` \ worker' ->
+ returnM (HsWorker worker' arity)
+
+rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenM` \ expr' ->
+ returnM (HsUnfold inline expr')
+rnIdInfo (HsStrictness str) = returnM (HsStrictness str)
+rnIdInfo (HsArity arity) = returnM (HsArity arity)
+rnIdInfo HsNoCafRefs = returnM HsNoCafRefs
\end{code}
-UfCore expressions.
+@UfCore@ expressions.
\begin{code}
+rnCoreExpr (UfType ty)
+ = rnHsType (text "unfolding type") ty `thenM` \ ty' ->
+ returnM (UfType ty')
+
rnCoreExpr (UfVar v)
- = lookupOccRn v `thenRn` \ v' ->
- returnRn (UfVar v')
+ = lookupOccRn v `thenM` \ v' ->
+ returnM (UfVar v')
-rnCoreExpr (UfLit lit) = returnRn (UfLit lit)
+rnCoreExpr (UfLit l)
+ = returnM (UfLit l)
-rnCoreExpr (UfCon con args)
- = lookupOccRn con `thenRn` \ con' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfCon con' args')
+rnCoreExpr (UfLitLit l ty)
+ = rnHsType (text "litlit") ty `thenM` \ ty' ->
+ returnM (UfLitLit l ty')
-rnCoreExpr (UfPrim prim args)
- = rnCorePrim prim `thenRn` \ prim' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfPrim prim' args')
+rnCoreExpr (UfFCall cc ty)
+ = rnHsType (text "ccall") ty `thenM` \ ty' ->
+ returnM (UfFCall cc ty')
-rnCoreExpr (UfApp fun arg)
- = rnCoreExpr fun `thenRn` \ fun' ->
- rnCoreArg arg `thenRn` \ arg' ->
- returnRn (UfApp fun' arg')
+rnCoreExpr (UfTuple (HsTupCon boxity arity) args)
+ = mappM rnCoreExpr args `thenM` \ args' ->
+ returnM (UfTuple (HsTupCon boxity arity) args')
-rnCoreExpr (UfCase scrut alts)
- = rnCoreExpr scrut `thenRn` \ scrut' ->
- rnCoreAlts alts `thenRn` \ alts' ->
- returnRn (UfCase scrut' alts')
+rnCoreExpr (UfApp fun arg)
+ = rnCoreExpr fun `thenM` \ fun' ->
+ rnCoreExpr arg `thenM` \ arg' ->
+ returnM (UfApp fun' arg')
-rnCoreExpr (UfSCC cc expr)
- = rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (UfSCC cc expr')
+rnCoreExpr (UfCase scrut bndr alts)
+ = rnCoreExpr scrut `thenM` \ scrut' ->
+ bindCoreLocalRn bndr $ \ bndr' ->
+ mappM rnCoreAlt alts `thenM` \ alts' ->
+ returnM (UfCase scrut' bndr' alts')
-rnCoreExpr(UfCoerce coercion ty body)
- = rnCoercion coercion `thenRn` \ coercion' ->
- rnHsType ty `thenRn` \ ty' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfCoerce coercion' ty' body')
+rnCoreExpr (UfNote note expr)
+ = rnNote note `thenM` \ note' ->
+ rnCoreExpr expr `thenM` \ expr' ->
+ returnM (UfNote note' expr')
rnCoreExpr (UfLam bndr body)
= rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLam bndr' body')
+ rnCoreExpr body `thenM` \ body' ->
+ returnM (UfLam bndr' body')
rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
- = rnCoreExpr rhs `thenRn` \ rhs' ->
+ = rnCoreExpr rhs `thenM` \ rhs' ->
rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfNonRec bndr' rhs') body')
+ rnCoreExpr body `thenM` \ body' ->
+ returnM (UfLet (UfNonRec bndr' rhs') body')
rnCoreExpr (UfLet (UfRec pairs) body)
= rnCoreBndrs bndrs $ \ bndrs' ->
- mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
+ mappM rnCoreExpr rhss `thenM` \ rhss' ->
+ rnCoreExpr body `thenM` \ body' ->
+ returnM (UfLet (UfRec (bndrs' `zip` rhss')) body')
where
(bndrs, rhss) = unzip pairs
\end{code}
\begin{code}
rnCoreBndr (UfValBinder name ty) thing_inside
- = rnHsType ty `thenRn` \ ty' ->
- bindLocalsRn "unfolding value" [name] $ \ [name'] ->
+ = rnHsType doc ty `thenM` \ ty' ->
+ bindCoreLocalRn name $ \ name' ->
thing_inside (UfValBinder name' ty')
+ where
+ doc = text "unfolding id"
rnCoreBndr (UfTyBinder name kind) thing_inside
- = bindLocalsRn "unfolding tyvar" [name] $ \ [name'] ->
+ = bindCoreLocalRn 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')
+rnCoreAlt (con, bndrs, rhs)
+ = rnUfCon con `thenM` \ con' ->
+ bindCoreLocalsRn bndrs $ \ bndrs' ->
+ rnCoreExpr rhs `thenM` \ rhs' ->
+ returnM (con', bndrs', rhs')
+
+rnNote (UfCoerce ty)
+ = rnHsType (text "unfolding coerce") ty `thenM` \ ty' ->
+ returnM (UfCoerce ty')
-rnCoreDefault UfNoDefault = returnRn UfNoDefault
-rnCoreDefault (UfBindDefault bndr rhs) = bindLocalsRn "unfolding default" [bndr] $ \ [bndr'] ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (UfBindDefault bndr' rhs')
+rnNote (UfSCC cc) = returnM (UfSCC cc)
+rnNote UfInlineCall = returnM UfInlineCall
+rnNote UfInlineMe = returnM UfInlineMe
-rnCoercion (UfIn n) = lookupOccRn n `thenRn` \ n' -> returnRn (UfIn n')
-rnCoercion (UfOut n) = lookupOccRn n `thenRn` \ n' -> returnRn (UfOut n')
-rnCorePrim (UfOtherOp op)
- = lookupOccRn op `thenRn` \ op' ->
- returnRn (UfOtherOp op')
+rnUfCon UfDefault
+ = returnM UfDefault
-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 (UfTupleAlt tup_con)
+ = returnM (UfTupleAlt tup_con)
+
+rnUfCon (UfDataAlt con)
+ = lookupOccRn con `thenM` \ con' ->
+ returnM (UfDataAlt con')
+
+rnUfCon (UfLitAlt lit)
+ = returnM (UfLitAlt lit)
+
+rnUfCon (UfLitLitAlt lit ty)
+ = rnHsType (text "litlit") ty `thenM` \ ty' ->
+ returnM (UfLitLitAlt lit ty')
\end{code}
%*********************************************************
%* *
-\subsection{Errors}
+\subsection{Statistics}
%* *
%*********************************************************
\begin{code}
-derivingNonStdClassErr clas
- = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")]
+rnStats :: [RenamedHsDecl] -- Imported decls
+ -> TcRn m ()
+rnStats imp_decls
+ = doptM Opt_D_dump_rn_trace `thenM` \ dump_rn_trace ->
+ doptM Opt_D_dump_rn_stats `thenM` \ dump_rn_stats ->
+ doptM Opt_D_dump_rn `thenM` \ dump_rn ->
+ getEps `thenM` \ eps ->
+
+ ioToTcRn (dumpIfSet (dump_rn_trace || dump_rn_stats || dump_rn)
+ "Renamer statistics"
+ (getRnStats eps imp_decls)) `thenM_`
+ returnM ()
+
+getRnStats :: ExternalPackageState -> [RenamedHsDecl] -> SDoc
+getRnStats eps imported_decls
+ = hcat [text "Renamer stats: ", stats]
+ where
+ n_mods = length [() | _ <- moduleEnvElts (eps_PIT eps)]
+ -- This is really only right for a one-shot compile
-classTyVarNotInOpTyErr clas_tyvar sig
- = hang (hsep [ptext SLIT("Class type variable"),
- quotes (ppr clas_tyvar),
- ptext SLIT("does not appear in method signature")])
- 4 (ppr sig)
+ (decls_map, n_decls_slurped) = eps_decls eps
+
+ n_decls_left = length [decl | (avail, True, (_,decl)) <- nameEnvElts decls_map
+ -- Data, newtype, and class decls are in the decls_fm
+ -- under multiple names; the tycon/class, and each
+ -- constructor/class op too.
+ -- The 'True' selects just the 'main' decl
+ ]
+
+ (insts_left, n_insts_slurped) = eps_insts eps
+ n_insts_left = length (bagToList insts_left)
+
+ (rules_left, n_rules_slurped) = eps_rules eps
+ n_rules_left = length (bagToList rules_left)
+
+ stats = vcat
+ [int n_mods <+> text "interfaces read",
+ hsep [ int n_decls_slurped, text "type/class/variable imported, out of",
+ int (n_decls_slurped + n_decls_left), text "read"],
+ hsep [ int n_insts_slurped, text "instance decls imported, out of",
+ int (n_insts_slurped + n_insts_left), text "read"],
+ hsep [ int n_rules_slurped, text "rule decls imported, out of",
+ int (n_rules_slurped + n_rules_left), text "read"]
+ ]
+\end{code}
-dupClassAssertWarn ctxt (assertion : dups)
- = sep [hsep [ptext SLIT("Duplicated class assertion"),
- quotes (pprClassAssertion assertion),
- ptext SLIT("in the context:")],
- nest 4 (pprContext ctxt)]
+%*********************************************************
+%* *
+\subsection{Errors}
+%* *
+%*********************************************************
+\begin{code}
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]
- $$
- nest 4 (ptext SLIT("in") <+> doc)
-
-ctxtErr2 doc tyvars ty
- = (ptext SLIT("Context constrains type variable(s)")
- <+> pprQuotedList tyvars)
+badRuleLhsErr name lhs (Just bad_e)
+ = sep [ptext SLIT("Rule") <+> ftext name <> colon,
+ nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e,
+ ptext SLIT("in left-hand side:") <+> ppr lhs])]
$$
- 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") <+> doubleQuotes (ftext name) <> colon,
+ ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
+ ptext SLIT("does not appear on left hand side")]
+
+emptyConDeclsErr tycon
+ = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"),
+ nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))]
+
+withWarning
+ = sep [quotes (ptext SLIT("with")),
+ ptext SLIT("is deprecated, use"),
+ quotes (ptext SLIT("let")),
+ ptext SLIT("instead")]
+
+badIpBinds binds
+ = hang (ptext SLIT("Implicit-parameter bindings illegal in 'mdo':")) 4
+ (ppr binds)
\end{code}
+