X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Frename%2FRnSource.lhs;h=50a9dcd1456e6e984aed0c23ab7d4879564011c0;hb=e7b69c553c58133ddbdc756bec03a43d35b0be5e;hp=15acf550336f66d2c5e3fa47a95c99266bd295a5;hpb=8f7ac3fe40d3d55743b824deab655d0797a1c55f;p=ghc-hetmet.git diff --git a/ghc/compiler/rename/RnSource.lhs b/ghc/compiler/rename/RnSource.lhs index 15acf55..50a9dcd 100644 --- a/ghc/compiler/rename/RnSource.lhs +++ b/ghc/compiler/rename/RnSource.lhs @@ -1,252 +1,437 @@ % -% (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} -#include "HsVersions.h" - -module RnSource ( rnDecl, rnHsType ) where +module RnSource ( rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, rnSourceDecls, + rnHsType, rnHsSigType, rnHsTypeFVs, rnHsSigTypeFVs + ) where -IMP_Ubiq() -IMPORT_DELOOPER(RnLoop) -- *check* the RnPass/RnExpr/RnBinds loop-breaking +#include "HsVersions.h" +import RnExpr import HsSyn -import HsDecls ( HsIdInfo(..) ) -import HsPragmas -import HsTypes ( getTyVarName ) -import RdrHsSyn +import HscTypes ( GlobalRdrEnv ) +import HsTypes ( hsTyVarNames, pprHsContext ) +import RdrName ( RdrName, isRdrDataCon, elemRdrEnv ) +import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, RdrNameTyClDecl, + extractRuleBndrsTyVars, extractHsTyRdrTyVars, + extractHsCtxtRdrTyVars, extractGenericPatTyVars + ) import RnHsSyn import HsCore -import RnBinds ( rnTopBinds, rnMethodBinds ) -import RnEnv ( bindTyVarsRn, lookupRn, lookupOccRn, lookupImplicitOccRn, bindLocalsRn, - lookupOptionalOccRn, newDfunName, - listType_RDR, tupleType_RDR ) +import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, renameSigsFVs ) +import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName, lookupIfaceName, + lookupOrigNames, lookupSysBinder, newLocalsRn, + bindLocalsFVRn, + bindTyVarsRn, bindTyVars2Rn, + bindTyVarsFV2Rn, extendTyVarEnvFVRn, + bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames, + checkDupOrQualNames, checkDupNames, mapFvRn + ) import RnMonad -import Name ( Name, isLocallyDefined, isTvOcc, pprNonSym, - Provenance, - SYN_IE(NameSet), unionNameSets, emptyNameSet, mkNameSet, unitNameSet, - elemNameSet +import Class ( FunDep, DefMeth (..) ) +import DataCon ( dataConId ) +import Name ( Name, NamedThing(..) ) +import NameSet +import PrelInfo ( derivableClassKeys, cCallishClassKeys ) +import PrelNames ( deRefStablePtr_RDR, newStablePtr_RDR, + bindIO_RDR, returnIO_RDR ) -import ErrUtils ( addErrLoc, addShortErrLocLine, addShortWarnLocLine ) -import FiniteMap ( emptyFM, lookupFM, addListToFM_C ) -import Id ( GenId{-instance NamedThing-} ) -import IdInfo ( IdInfo, StrictnessInfo(..), FBTypeInfo, DemandInfo, ArgUsageInfo ) -import SpecEnv ( SpecEnv ) -import CoreUnfold ( Unfolding(..), SimpleUnfolding ) -import MagicUFs ( MagicUnfoldingFun ) -import PrelInfo ( derivingOccurrences, evalClass_RDR, numClass_RDR ) -import ListSetOps ( unionLists, minusList ) -import Maybes ( maybeToBool, catMaybes ) -import Bag ( emptyBag, unitBag, consBag, unionManyBags, unionBags, listToBag, bagToList ) -import Outputable ( Outputable(..){-instances-} ) ---import PprStyle -- ToDo:rm -import Pretty +import TysWiredIn ( tupleCon ) +import List ( partition, nub ) +import Outputable import SrcLoc ( SrcLoc ) --- import TyCon ( TyCon{-instance NamedThing-} ) -import Unique ( Unique ) -import UniqSet ( SYN_IE(UniqSet) ) -import UniqFM ( UniqFM, lookupUFM ) -import Util ( isIn, isn'tIn, thenCmp, removeDups, cmpPString, - panic, assertPanic{- , pprTrace ToDo:rm-} ) +import CmdLineOpts ( DynFlag(..) ) + -- Warn of unused for-all'd tyvars +import Unique ( Uniquable(..) ) +import Maybes ( maybeToBool ) +import ErrUtils ( Message ) +import CStrings ( isCLabelString ) +import ListSetOps ( removeDupsEq ) \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} %********************************************************* %* * -\subsection{Value declarations} +\subsection{Source code declarations} %* * %********************************************************* \begin{code} -rnDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl +rnSourceDecls :: GlobalRdrEnv -> LocalFixityEnv + -> [RdrNameHsDecl] + -> RnMG ([RenamedHsDecl], FreeVars) + -- The decls get reversed, but that's ok -rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ new_binds -> - returnRn (ValD new_binds) +rnSourceDecls gbl_env local_fixity_env decls + = initRnMS gbl_env emptyRdrEnv local_fixity_env SourceMode (go emptyFVs [] decls) + where + -- Fixity and deprecations 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' (DeprecD _:ds) = go fvs ds' ds + go fvs ds' (d:ds) = rnSourceDecl d `thenRn` \(d', fvs') -> + go (fvs `plusFV` fvs') (d':ds') ds -rnDecl (SigD (IfaceSig name ty id_infos loc)) - = pushSrcLocRn loc $ - lookupRn name `thenRn` \ name' -> - rnHsType ty `thenRn` \ ty' -> - mapRn rnIdInfo id_infos `thenRn` \ id_infos' -> - returnRn (SigD (IfaceSig name' ty' id_infos' loc)) -\end{code} +rnSourceDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars) -%********************************************************* -%* * -\subsection{Type declarations} -%* * -%********************************************************* +rnSourceDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) -> + returnRn (ValD new_binds, fvs) -@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. +rnSourceDecl (TyClD tycl_decl) + = rnTyClDecl tycl_decl `thenRn` \ new_decl -> + finishSourceTyClDecl tycl_decl new_decl `thenRn` \ (new_decl', fvs) -> + returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl') -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. +rnSourceDecl (InstD inst) + = rnInstDecl inst `thenRn` \ new_inst -> + finishSourceInstDecl inst new_inst `thenRn` \ (new_inst', fvs) -> + returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst') -\begin{code} -rnDecl (TyD (TyData context tycon tyvars condecls derivings pragmas src_loc)) - = pushSrcLocRn src_loc $ - lookupRn tycon `thenRn` \ tycon' -> - bindTyVarsRn "data declaration" tyvars $ \ tyvars' -> - rnContext context `thenRn` \ context' -> - mapRn rnConDecl condecls `thenRn` \ condecls' -> - rnDerivs derivings `thenRn` \ derivings' -> - ASSERT(isNoDataPragmas pragmas) - returnRn (TyD (TyData context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc)) +rnSourceDecl (RuleD rule) + = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) -> + returnRn (RuleD new_rule, fvs) -rnDecl (TyD (TyNew context tycon tyvars condecl derivings pragmas src_loc)) +rnSourceDecl (DefD (DefaultDecl tys src_loc)) = pushSrcLocRn src_loc $ - lookupRn tycon `thenRn` \ tycon' -> - bindTyVarsRn "newtype declaration" tyvars $ \ tyvars' -> - rnContext context `thenRn` \ context' -> - rnConDecl condecl `thenRn` \ condecl' -> - rnDerivs derivings `thenRn` \ derivings' -> - ASSERT(isNoDataPragmas pragmas) - returnRn (TyD (TyNew context' tycon' tyvars' condecl' derivings' noDataPragmas src_loc)) - -rnDecl (TyD (TySynonym name tyvars ty src_loc)) + mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) -> + returnRn (DefD (DefaultDecl tys' src_loc), fvs) + where + doc_str = text "a `default' declaration" + +rnSourceDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc)) = pushSrcLocRn src_loc $ - lookupRn name `thenRn` \ name' -> - bindTyVarsRn "type declaration" tyvars $ \ tyvars' -> - rnHsType ty `thenRn` \ ty' -> - returnRn (TyD (TySynonym name' tyvars' ty' src_loc)) + lookupOccRn name `thenRn` \ name' -> + let + extra_fvs FoExport + | isDyn = lookupOrigNames [newStablePtr_RDR, deRefStablePtr_RDR, + bindIO_RDR, returnIO_RDR] + | otherwise = + lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs -> + returnRn (addOneFV fvs name') + extra_fvs other = returnRn emptyFVs + in + checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_` + + extra_fvs imp_exp `thenRn` \ fvs1 -> + + rnHsTypeFVs 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("The foreign declaration for") <+> ppr name + isDyn = isDynamicExtName ext_nm + + ok_ext_nm Dynamic = True + ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb + ok_ext_nm (ExtName nm Nothing) = isCLabelString nm \end{code} + %********************************************************* %* * -\subsection{Class declarations} +\subsection{Instance 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 tyvar sigs mbinds pragmas src_loc)) +rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc) + -- Used for both source and interface file decls = pushSrcLocRn src_loc $ - bindTyVarsRn "class declaration" [tyvar] $ \ [tyvar'] -> - rnContext context `thenRn` \ context' -> - lookupRn cname `thenRn` \ cname' -> - mapRn (rn_op cname' (getTyVarName tyvar')) sigs `thenRn` \ sigs' -> - rnMethodBinds mbinds `thenRn` \ mbinds' -> - ASSERT(isNoClassPragmas pragmas) - returnRn (ClD (ClassDecl context' cname' tyvar' sigs' mbinds' NoClassPragmas src_loc)) - where - rn_op clas clas_tyvar sig@(ClassOpSig op ty pragmas locn) - = pushSrcLocRn locn $ - lookupRn op `thenRn` \ op_name -> - rnHsType ty `thenRn` \ new_ty -> - let - (ctxt, op_ty) = case new_ty of - HsForAllTy tvs ctxt op_ty -> (ctxt, op_ty) - other -> ([], new_ty) - ctxt_fvs = extractCtxtTyNames ctxt - op_ty_fvs = extractHsTyNames op_ty -- Includes tycons/classes but we - -- don't care about that - in - -- check that class tyvar appears in op_ty - checkRn (clas_tyvar `elemNameSet` op_ty_fvs) - (classTyVarNotInOpTyErr clas_tyvar sig) - `thenRn_` - - -- check that class tyvar *doesn't* appear in the sig's context - checkRn (not (clas_tyvar `elemNameSet` ctxt_fvs)) - (classTyVarInOpCtxtErr clas_tyvar sig) - `thenRn_` - - ASSERT(isNoClassOpPragmas pragmas) - returnRn (ClassOpSig op_name new_ty noClassOpPragmas locn) -\end{code} + rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' -> + + (case maybe_dfun_rdr_name of + Nothing -> returnRn Nothing + Just dfun_rdr_name -> lookupIfaceName dfun_rdr_name `thenRn` \ dfun_name -> + returnRn (Just dfun_name) + ) `thenRn` \ maybe_dfun_name -> + + -- The typechecker checks that all the bindings are for the right class. + returnRn (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 "the bindings in an instance declaration" + meth_names = collectLocatedMonoBinders mbinds + 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_` + extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) ( + rnMethodBinds [] mbinds + ) `thenRn` \ (mbinds', meth_fvs) -> + let + binders = collectMonoBinders mbinds' + binder_set = mkNameSet binders + 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 ( + renameSigsFVs (okInstDclSig binder_set) uprags + ) `thenRn` \ (uprags', prag_fvs) -> + + returnRn (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc, + meth_fvs `plusFV` prag_fvs) +\end{code} %********************************************************* %* * -\subsection{Instance declarations} +\subsection{Rules} %* * %********************************************************* \begin{code} -rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun_name src_loc)) - = pushSrcLocRn src_loc $ - rnHsType inst_ty `thenRn` \ inst_ty' -> - rnMethodBinds mbinds `thenRn` \ mbinds' -> - mapRn rn_uprag uprags `thenRn` \ new_uprags -> - rn_dfun maybe_dfun_name `thenRn` \ dfun_name' -> - - returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags dfun_name' src_loc)) +rnIfaceRuleDecl (IfaceRule rule_name vars fn args rhs src_loc) + = pushSrcLocRn src_loc $ + lookupOccRn fn `thenRn` \ fn' -> + rnCoreBndrs vars $ \ vars' -> + mapRn rnCoreExpr args `thenRn` \ args' -> + rnCoreExpr rhs `thenRn` \ rhs' -> + returnRn (IfaceRule rule_name vars' fn' args' rhs' src_loc) + +rnHsRuleDecl (HsRule 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 (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc, + fv_vars `plusFV` fv_lhs `plusFV` fv_rhs) where - rn_dfun Nothing = newDfunName src_loc `thenRn` \ n' -> - returnRn (Just n') - rn_dfun (Just n) = lookupOccRn n `thenRn` \ n' -> - -- The dfun is not optional, because we use its version number - -- to identify the version of the instance declaration - returnRn (Just n') - - rn_uprag (SpecSig op ty using locn) - = pushSrcLocRn src_loc $ - lookupRn op `thenRn` \ op_name -> - rnHsType 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 $ - lookupRn op `thenRn` \ op_name -> - returnRn (InlineSig op_name locn) - - rn_uprag (DeforestSig op locn) - = pushSrcLocRn locn $ - lookupRn op `thenRn` \ op_name -> - returnRn (DeforestSig op_name locn) - - rn_uprag (MagicUnfoldingSig op str locn) - = pushSrcLocRn locn $ - lookupRn 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) + 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) = rnHsTypeFVs doc t `thenRn` \ (t', fvs) -> + returnRn (RuleBndrSig id t', fvs) \end{code} + %********************************************************* %* * -\subsection{Default 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} -rnDecl (DefD (DefaultDecl tys src_loc)) +rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc}) + = pushSrcLocRn loc $ + lookupTopBndrRn name `thenRn` \ name' -> + rnHsType doc_str ty `thenRn` \ ty' -> + mapRn rnIdInfo id_infos `thenRn` \ id_infos' -> + returnRn (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc}) + where + doc_str = text "the interface signature for" <+> quotes (ppr name) + +rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon, + tcdTyVars = tyvars, tcdCons = condecls, tcdNCons = nconstrs, + tcdLoc = src_loc, tcdSysNames = sys_names}) + = pushSrcLocRn src_loc $ + lookupTopBndrRn tycon `thenRn` \ tycon' -> + bindTyVarsRn data_doc tyvars $ \ tyvars' -> + rnContext data_doc context `thenRn` \ context' -> + checkDupOrQualNames data_doc con_names `thenRn_` + mapRn rnConDecl condecls `thenRn` \ condecls' -> + mapRn lookupSysBinder sys_names `thenRn` \ sys_names' -> + returnRn (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon', + tcdTyVars = tyvars', tcdCons = condecls', tcdNCons = nconstrs, + tcdDerivs = Nothing, tcdLoc = src_loc, tcdSysNames = sys_names'}) + where + data_doc = text "the data type declaration for" <+> quotes (ppr tycon) + con_names = map conDeclName condecls + +rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc}) + = pushSrcLocRn src_loc $ + doptRn Opt_GlasgowExts `thenRn` \ glaExts -> + lookupTopBndrRn name `thenRn` \ name' -> + bindTyVarsRn syn_doc tyvars $ \ tyvars' -> + rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ ty' -> + returnRn (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc}) + where + syn_doc = text "the declaration for type synonym" <+> quotes (ppr name) + + -- For H98 we do *not* universally quantify on the RHS of a synonym + -- Silently discard context... but the tyvars in the rest won't be in scope + -- In interface files all types are quantified, so this is a no-op + unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty + unquantify glaExts ty = ty + +rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname, + tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs, + tcdSysNames = names, tcdLoc = src_loc}) + -- Used for both source and interface file decls = pushSrcLocRn src_loc $ - mapRn rnHsType tys `thenRn` \ tys' -> - lookupImplicitOccRn numClass_RDR `thenRn_` - returnRn (DefD (DefaultDecl tys' src_loc)) + + lookupTopBndrRn cname `thenRn` \ cname' -> + + -- 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! + mapRn lookupSysBinder names `thenRn` \ names' -> + + -- Tyvars scope over bindings and context + bindTyVars2Rn cls_doc tyvars $ \ clas_tyvar_names tyvars' -> + + -- Check the superclasses + rnContext cls_doc context `thenRn` \ context' -> + + -- Check the functional dependencies + rnFds cls_doc fds `thenRn` \ 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 `thenRn_` + mapRn (rnClassOp cname' clas_tyvar_names fds') op_sigs `thenRn` \ sigs' -> + let + binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ] + in + renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ non_ops' -> + + -- 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. + + returnRn (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars', + tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing, + tcdSysNames = names', tcdLoc = src_loc}) + where + cls_doc = text "the declaration for class" <+> ppr cname + sig_doc = text "the signatures for class" <+> ppr cname + +rnClassOp clas clas_tyvars clas_fds sig@(ClassOpSig op dm_stuff ty locn) + = pushSrcLocRn locn $ + lookupTopBndrRn op `thenRn` \ op_name -> + + -- Check the signature + rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty -> + + -- Make the default-method name + (case dm_stuff of + DefMeth dm_rdr_name + -> -- Imported class that has a default method decl + -- See comments with tname, snames, above + lookupSysBinder dm_rdr_name `thenRn` \ dm_name -> + returnRn (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 -> returnRn GenDefMeth + NoDefMeth -> returnRn NoDefMeth + ) `thenRn` \ dm_stuff' -> + + returnRn (ClassOpSig op_name dm_stuff' new_ty locn) + +finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars) + -- Used for source file decls only + -- Renames the default-bindings of a class decl + -- the derivings of a data decl +finishSourceTyClDecl (TyData {tcdDerivs = Just derivs, tcdLoc = src_loc}) -- Derivings in here + rn_ty_decl -- Everything else is here + = pushSrcLocRn src_loc $ + mapRn rnDeriv derivs `thenRn` \ derivs' -> + returnRn (rn_ty_decl {tcdDerivs = Just derivs'}, mkNameSet derivs') + +finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here + rn_cls_decl@(ClassDecl {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 + pushSrcLocRn src_loc $ + extendTyVarEnvFVRn (map hsTyVarName tyvars) $ + getLocalNameEnv `thenRn` \ 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 `thenRn_` + newLocalsRn gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars -> + rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) -> + returnRn (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs) + where + meth_doc = text "the default-methods for class" <+> ppr (tcdName rn_cls_decl) + +finishSourceTyClDecl _ tycl_decl = returnRn (tycl_decl, emptyFVs) + -- Not a class declaration \end{code} + %********************************************************* %* * \subsection{Support code for type/data declarations} @@ -254,71 +439,80 @@ rnDecl (DefD (DefaultDecl tys src_loc)) %********************************************************* \begin{code} -rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name]) - -rnDerivs Nothing -- derivs not specified - = lookupImplicitOccRn evalClass_RDR `thenRn_` - returnRn Nothing - -rnDerivs (Just ds) - = lookupImplicitOccRn evalClass_RDR `thenRn_` - mapRn rn_deriv ds `thenRn` \ derivs -> - returnRn (Just derivs) - 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 +rnDeriv :: RdrName -> RnMS Name +rnDeriv cls + = lookupOccRn cls `thenRn` \ clas_name -> + checkRn (getUnique clas_name `elem` derivableClassKeys) + (derivingNonStdClassErr clas_name) `thenRn_` + returnRn clas_name \end{code} \begin{code} -rnConDecl :: RdrNameConDecl -> RnMS s RenamedConDecl +conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc) +conDeclName (ConDecl n _ _ _ _ l) = (n,l) + +rnConDecl :: RdrNameConDecl -> RnMS RenamedConDecl +rnConDecl (ConDecl name wkr tvs cxt details locn) + = pushSrcLocRn locn $ + checkConName name `thenRn_` + lookupTopBndrRn name `thenRn` \ new_name -> + + lookupSysBinder wkr `thenRn` \ new_wkr -> + -- See comments with ClassDecl + + bindTyVarsRn doc tvs $ \ new_tyvars -> + rnContext doc cxt `thenRn` \ new_context -> + rnConDetails doc locn details `thenRn` \ new_details -> + returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn) + where + doc = text "the definition of data constructor" <+> quotes (ppr name) -rnConDecl (ConDecl name tys src_loc) - = pushSrcLocRn src_loc $ - lookupRn name `thenRn` \ new_name -> - mapRn rnBangTy tys `thenRn` \ new_tys -> - returnRn (ConDecl new_name new_tys src_loc) +rnConDetails doc locn (VanillaCon tys) + = mapRn (rnBangTy doc) tys `thenRn` \ new_tys -> + returnRn (VanillaCon new_tys) -rnConDecl (ConOpDecl ty1 op ty2 src_loc) - = pushSrcLocRn src_loc $ - lookupRn op `thenRn` \ new_op -> - rnBangTy ty1 `thenRn` \ new_ty1 -> - rnBangTy ty2 `thenRn` \ new_ty2 -> - returnRn (ConOpDecl new_ty1 new_op new_ty2 src_loc) +rnConDetails doc locn (InfixCon ty1 ty2) + = rnBangTy doc ty1 `thenRn` \ new_ty1 -> + rnBangTy doc ty2 `thenRn` \ new_ty2 -> + returnRn (InfixCon new_ty1 new_ty2) -rnConDecl (NewConDecl name ty src_loc) - = pushSrcLocRn src_loc $ - lookupRn name `thenRn` \ new_name -> - rnHsType ty `thenRn` \ new_ty -> - returnRn (NewConDecl new_name new_ty src_loc) - -rnConDecl (RecConDecl name fields src_loc) - = pushSrcLocRn src_loc $ - lookupRn name `thenRn` \ new_name -> - mapRn rnField fields `thenRn` \ new_fields -> - returnRn (RecConDecl new_name new_fields src_loc) +rnConDetails doc locn (RecCon fields) + = checkDupOrQualNames doc field_names `thenRn_` + mapRn (rnField doc) fields `thenRn` \ new_fields -> + returnRn (RecCon new_fields) + where + field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds] -rnField (names, ty) - = mapRn lookupRn names `thenRn` \ new_names -> - rnBangTy ty `thenRn` \ new_ty -> +rnField doc (names, ty) + = mapRn lookupTopBndrRn names `thenRn` \ new_names -> + rnBangTy doc ty `thenRn` \ new_ty -> returnRn (new_names, new_ty) -rnBangTy (Banged ty) - = rnHsType ty `thenRn` \ new_ty -> +rnBangTy doc (Banged ty) + = rnHsType doc ty `thenRn` \ new_ty -> returnRn (Banged new_ty) -rnBangTy (Unbanged ty) - = rnHsType ty `thenRn` \ new_ty -> +rnBangTy doc (Unbanged ty) + = rnHsType doc ty `thenRn` \ new_ty -> returnRn (Unbanged new_ty) + +rnBangTy doc (Unpacked ty) + = rnHsType doc ty `thenRn` \ new_ty -> + returnRn (Unpacked new_ty) + +-- This data decl will parse OK +-- data T = a Int +-- treating "a" as the constructor. +-- It is really hard to make the parser spot this malformation. +-- So the renamer has to check that the constructor is legal +-- +-- We can get an operator as the constructor, even in the prefix form: +-- data T = :% Int Int +-- from interface files, which always print in prefix form + +checkConName name + = checkRn (isRdrDataCon name) + (badDataCon name) \end{code} @@ -329,152 +523,232 @@ rnBangTy (Unbanged ty) %********************************************************* \begin{code} -rnHsType :: RdrNameHsType -> RnMS s RenamedHsType - -rnHsType (HsForAllTy tvs ctxt ty) - = rn_poly_help tvs ctxt ty - -rnHsType full_ty@(HsPreForAllTy ctxt ty) - = getNameEnv `thenRn` \ name_env -> +rnHsTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars) +rnHsTypeFVs doc_str ty + = rnHsType doc_str ty `thenRn` \ ty' -> + returnRn (ty', extractHsTyNames ty') + +rnHsSigTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars) +rnHsSigTypeFVs doc_str ty + = rnHsSigType doc_str ty `thenRn` \ ty' -> + returnRn (ty', extractHsTyNames ty') + +rnHsSigType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType + -- rnHsSigType is used for source-language type signatures, + -- which use *implicit* universal quantification. +rnHsSigType doc_str ty + = rnHsType (text "the type signature for" <+> doc_str) ty + +--------------------------------------- +rnHsType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType + +rnHsType doc (HsForAllTy Nothing ctxt ty) + -- Implicit quantifiction in 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 full_ty - forall_tyvars = filter not_in_scope mentioned_tyvars - not_in_scope tv = case lookupFM name_env tv of - Nothing -> True - Just _ -> False + mentioned_in_tau = extractHsTyRdrTyVars ty + mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt + mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt) + forall_tyvars = filter (not . (`elemRdrEnv` name_env)) mentioned in - rn_poly_help (map UserTyVar forall_tyvars) ctxt ty + 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 actually + -- mentioned in the type, and produce a warning if not + = let + mentioned_in_tau = extractHsTyRdrTyVars tau + mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt + mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt) + forall_tyvar_names = hsTyVarNames forall_tyvars + + -- Explicitly quantified but not mentioned in ctxt or tau + warn_guys = filter (`notElem` mentioned) forall_tyvar_names + in + mapRn_ (forAllWarn doc tau) warn_guys `thenRn_` + rnForAll doc forall_tyvars ctxt tau -rnHsType (MonoTyVar tyvar) +rnHsType doc (HsTyVar 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 name tys) - = lookupOccRn name `thenRn` \ name' -> - mapRn rnHsType tys `thenRn` \ tys' -> - returnRn (MonoTyApp name' tys') - -rnHsType (MonoDictTy clas ty) - = lookupOccRn clas `thenRn` \ clas' -> - rnHsType ty `thenRn` \ ty' -> - returnRn (MonoDictTy clas' ty') - - -rn_poly_help :: [HsTyVar RdrName] -- Universally quantified tyvars - -> RdrNameContext - -> RdrNameHsType - -> RnMS s RenamedHsType - -rn_poly_help tyvars ctxt ty - = bindTyVarsRn "type signature" tyvars $ \ new_tyvars -> - rnContext ctxt `thenRn` \ new_ctxt -> - rnHsType ty `thenRn` \ new_ty -> - returnRn (HsForAllTy new_tyvars new_ctxt new_ty) + returnRn (HsTyVar tyvar') + +rnHsType doc (HsOpTy ty1 opname ty2) + = lookupOccRn opname `thenRn` \ name' -> + rnHsType doc ty1 `thenRn` \ ty1' -> + rnHsType doc ty2 `thenRn` \ ty2' -> + returnRn (HsOpTy ty1' name' ty2') + +rnHsType doc (HsNumTy i) + | i == 1 = returnRn (HsNumTy i) + | otherwise = failWithRn (HsNumTy i) + (ptext SLIT("Only unit numeric type pattern is valid")) + +rnHsType doc (HsFunTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ ty1' -> + -- Might find a for-all as the arg of a function type + rnHsType doc ty2 `thenRn` \ ty2' -> + -- Or as the result. This happens when reading Prelude.hi + -- when we find return :: forall m. Monad m -> forall a. a -> m a + returnRn (HsFunTy ty1' ty2') + +rnHsType doc (HsListTy ty) + = rnHsType doc ty `thenRn` \ ty' -> + returnRn (HsListTy ty') + +-- Unboxed tuples are allowed to have poly-typed arguments. These +-- sometimes crop up as a result of CPR worker-wrappering dictionaries. +rnHsType doc (HsTupleTy (HsTupCon _ boxity arity) tys) + -- Don't do lookupOccRn, because this is built-in syntax + -- so it doesn't need to be in scope + = mapRn (rnHsType doc) tys `thenRn` \ tys' -> + returnRn (HsTupleTy (HsTupCon tup_name boxity arity) tys') + where + tup_name = tupleTyCon_name boxity arity + + +rnHsType doc (HsAppTy ty1 ty2) + = rnHsType doc ty1 `thenRn` \ ty1' -> + rnHsType doc ty2 `thenRn` \ ty2' -> + returnRn (HsAppTy ty1' ty2') + +rnHsType doc (HsPredTy pred) + = rnPred doc pred `thenRn` \ pred' -> + returnRn (HsPredTy pred') + +rnHsTypes doc tys = mapRn (rnHsType doc) tys \end{code} +\begin{code} +rnForAll doc forall_tyvars ctxt ty + = bindTyVarsRn doc forall_tyvars $ \ new_tyvars -> + rnContext doc ctxt `thenRn` \ new_ctxt -> + rnHsType doc ty `thenRn` \ new_ty -> + returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty) +\end{code} \begin{code} -rnContext :: RdrNameContext -> RnMS s RenamedContext +rnContext :: SDoc -> RdrNameContext -> RnMS RenamedContext +rnContext doc ctxt + = mapRn rn_pred ctxt `thenRn` \ theta -> + + -- Check for duplicate assertions + -- If this isn't an error, then it ought to be: + ifOptRn Opt_WarnMisc ( + let + (_, dups) = removeDupsEq theta + -- We only have equality, not ordering + in + mapRn (addWarnRn . dupClassAssertWarn theta) dups + ) `thenRn_` + + returnRn theta + where + --Someone discovered that @CCallable@ and @CReturnable@ + -- could be used in contexts such as: + -- foo :: CCallable a => a -> PrimIO Int + -- Doing this utterly wrecks the whole point of introducing these + -- classes so we specifically check that this isn't being done. + rn_pred pred = rnPred doc pred `thenRn` \ pred'-> + checkRn (not (bad_pred pred')) + (naughtyCCallContextErr pred') `thenRn_` + returnRn pred' + + bad_pred (HsClassP clas _) = getUnique clas `elem` cCallishClassKeys + bad_pred other = False + + +rnPred doc (HsClassP clas tys) + = lookupOccRn clas `thenRn` \ clas_name -> + rnHsTypes doc tys `thenRn` \ tys' -> + returnRn (HsClassP clas_name tys') + +rnPred doc (HsIParam n ty) + = newIPName n `thenRn` \ name -> + rnHsType doc ty `thenRn` \ ty' -> + returnRn (HsIParam name ty') +\end{code} -rnContext ctxt - = mapRn rn_ctxt ctxt `thenRn` \ result -> - let - (_, dup_asserts) = removeDups cmp_assert result - in - -- If this isn't an error, then it ought to be: - mapRn (addWarnRn . dupClassAssertWarn result) dup_asserts `thenRn_` - returnRn result +\begin{code} +rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name] + +rnFds doc fds + = mapRn rn_fds fds where - rn_ctxt (clas, ty) - = lookupOccRn clas `thenRn` \ clas_name -> - rnHsType ty `thenRn` \ ty' -> - returnRn (clas_name, ty') + rn_fds (tys1, tys2) + = rnHsTyVars doc tys1 `thenRn` \ tys1' -> + rnHsTyVars doc tys2 `thenRn` \ tys2' -> + returnRn (tys1', tys2') - cmp_assert (c1,ty1) (c2,ty2) - = (c1 `cmp` c2) `thenCmp` (cmpHsType cmp ty1 ty2) +rnHsTyVars doc tvs = mapRn (rnHsTyvar doc) tvs +rnHsTyvar doc tyvar = lookupOccRn tyvar \end{code} - %********************************************************* -%* * +%* * \subsection{IdInfo} -%* * +%* * %********************************************************* \begin{code} -rnIdInfo (HsStrictness strict) - = rnStrict strict `thenRn` \ strict' -> - returnRn (HsStrictness strict') +rnIdInfo (HsWorker worker arity) + = lookupOccRn worker `thenRn` \ worker' -> + returnRn (HsWorker worker' arity) -rnIdInfo (HsUnfold expr) = rnCoreExpr expr `thenRn` \ expr' -> - returnRn (HsUnfold expr') +rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' -> + returnRn (HsUnfold inline expr') +rnIdInfo (HsStrictness str) = returnRn (HsStrictness str) rnIdInfo (HsArity arity) = returnRn (HsArity arity) -rnIdInfo (HsUpdate update) = returnRn (HsUpdate update) -rnIdInfo (HsFBType fb) = returnRn (HsFBType fb) -rnIdInfo (HsArgUsage au) = returnRn (HsArgUsage au) -rnIdInfo (HsDeforest df) = returnRn (HsDeforest df) - -rnStrict (StrictnessInfo demands (Just worker)) - = lookupOptionalOccRn worker `thenRn` \ worker' -> - returnRn (StrictnessInfo demands (Just worker')) - --- Boring, but necessary for the type checker. -rnStrict (StrictnessInfo demands Nothing) = returnRn (StrictnessInfo demands Nothing) -rnStrict BottomGuaranteed = returnRn BottomGuaranteed -rnStrict NoStrictnessInfo = returnRn NoStrictnessInfo +rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs +rnIdInfo HsCprInfo = returnRn HsCprInfo \end{code} -UfCore expressions. +@UfCore@ expressions. \begin{code} +rnCoreExpr (UfType ty) + = rnHsType (text "unfolding type") ty `thenRn` \ ty' -> + returnRn (UfType ty') + rnCoreExpr (UfVar v) - = lookupOptionalOccRn v `thenRn` \ v' -> + = lookupOccRn v `thenRn` \ v' -> returnRn (UfVar v') -rnCoreExpr (UfLit lit) = returnRn (UfLit lit) +rnCoreExpr (UfLit l) + = returnRn (UfLit l) -rnCoreExpr (UfCon con args) - = lookupOptionalOccRn con `thenRn` \ con' -> - mapRn rnCoreArg args `thenRn` \ args' -> - returnRn (UfCon con' args') +rnCoreExpr (UfLitLit l ty) + = rnHsType (text "litlit") ty `thenRn` \ ty' -> + returnRn (UfLitLit l ty') -rnCoreExpr (UfPrim prim args) - = rnCorePrim prim `thenRn` \ prim' -> - mapRn rnCoreArg args `thenRn` \ args' -> - returnRn (UfPrim prim' args') +rnCoreExpr (UfCCall cc ty) + = rnHsType (text "ccall") ty `thenRn` \ ty' -> + returnRn (UfCCall cc ty') + +rnCoreExpr (UfTuple (HsTupCon _ boxity arity) args) + = mapRn rnCoreExpr args `thenRn` \ args' -> + returnRn (UfTuple (HsTupCon tup_name boxity arity) args') + where + tup_name = getName (dataConId (tupleCon boxity arity)) + -- Get the *worker* name and use that rnCoreExpr (UfApp fun arg) = rnCoreExpr fun `thenRn` \ fun' -> - rnCoreArg arg `thenRn` \ arg' -> + rnCoreExpr arg `thenRn` \ arg' -> returnRn (UfApp fun' arg') -rnCoreExpr (UfCase scrut alts) - = rnCoreExpr scrut `thenRn` \ scrut' -> - rnCoreAlts alts `thenRn` \ alts' -> - returnRn (UfCase scrut' alts') +rnCoreExpr (UfCase scrut bndr alts) + = rnCoreExpr scrut `thenRn` \ scrut' -> + bindCoreLocalRn bndr $ \ bndr' -> + mapRn rnCoreAlt alts `thenRn` \ alts' -> + returnRn (UfCase scrut' bndr' alts') -rnCoreExpr (UfSCC cc expr) - = rnCoreExpr expr `thenRn` \ expr' -> - returnRn (UfSCC cc expr') - -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 `thenRn` \ note' -> + rnCoreExpr expr `thenRn` \ expr' -> + returnRn (UfNote note' expr') rnCoreExpr (UfLam bndr body) = rnCoreBndr bndr $ \ bndr' -> @@ -498,138 +772,131 @@ rnCoreExpr (UfLet (UfRec pairs) body) \begin{code} rnCoreBndr (UfValBinder name ty) thing_inside - = rnHsType ty `thenRn` \ ty' -> - bindLocalsRn "unfolding value" [name] $ \ [name'] -> + = rnHsType doc ty `thenRn` \ 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) -rnCoreBndr (UfUsageBinder name) thing_inside - = bindLocalsRn "unfolding usage" [name] $ \ [name'] -> - thing_inside (UfUsageBinder name') - -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 +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) = lookupOptionalOccRn v `thenRn` \ v' -> returnRn (UfVarArg v') -rnCoreArg (UfUsageArg u) = lookupOptionalOccRn u `thenRn` \ u' -> returnRn (UfUsageArg u') -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) = lookupOptionalOccRn con `thenRn` \ con' -> - rnCoreBndrs 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 `thenRn` \ con' -> + bindCoreLocalsRn bndrs $ \ bndrs' -> + rnCoreExpr rhs `thenRn` \ rhs' -> + returnRn (con', bndrs', rhs') -rnCoreDefault UfNoDefault = returnRn UfNoDefault -rnCoreDefault (UfBindDefault bndr rhs) = rnCoreBndr bndr $ \ bndr' -> - rnCoreExpr rhs `thenRn` \ rhs' -> - returnRn (UfBindDefault bndr' rhs') +rnNote (UfCoerce ty) + = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' -> + returnRn (UfCoerce ty') -rnCoercion (UfIn n) = lookupOptionalOccRn n `thenRn` \ n' -> returnRn (UfIn n') -rnCoercion (UfOut n) = lookupOptionalOccRn n `thenRn` \ n' -> returnRn (UfOut n') +rnNote (UfSCC cc) = returnRn (UfSCC cc) +rnNote UfInlineCall = returnRn UfInlineCall +rnNote UfInlineMe = returnRn UfInlineMe -rnCorePrim (UfOtherOp op) - = lookupOptionalOccRn op `thenRn` \ op' -> - returnRn (UfOtherOp op') -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') -\end{code} +rnUfCon UfDefault + = returnRn UfDefault -%********************************************************* -%* * -\subsection{Errors} -%* * -%********************************************************* - -\begin{code} -derivingNonStdClassErr clas sty - = ppCat [ppStr "non-standard class in deriving:", ppr sty clas] +rnUfCon (UfTupleAlt (HsTupCon _ boxity arity)) + = returnRn (UfTupleAlt (HsTupCon tup_name boxity arity)) + where + tup_name = getName (tupleCon boxity arity) -classTyVarNotInOpTyErr clas_tyvar sig sty - = ppHang (ppBesides [ppStr "Class type variable `", ppr sty clas_tyvar, ppStr "' does not appear in method signature:"]) - 4 (ppr sty sig) +rnUfCon (UfDataAlt con) + = lookupOccRn con `thenRn` \ con' -> + returnRn (UfDataAlt con') -classTyVarInOpCtxtErr clas_tyvar sig sty - = ppHang (ppBesides [ ppStr "Class type variable `", ppr sty clas_tyvar, - ppStr "' present in method's local overloading context:"]) - 4 (ppr sty sig) +rnUfCon (UfLitAlt lit) + = returnRn (UfLitAlt lit) -dupClassAssertWarn ctxt dups sty - = ppHang (ppBesides [ppStr "Duplicate class assertion `", ppr sty dups, ppStr "' in context:"]) - 4 (ppr sty ctxt) +rnUfCon (UfLitLitAlt lit ty) + = rnHsType (text "litlit") ty `thenRn` \ ty' -> + returnRn (UfLitLitAlt lit ty') \end{code} - - - - -=================== OLD STUFF ====================== - %********************************************************* %* * -\subsection{SPECIALIZE data pragmas} +\subsection{Rule shapes} %* * %********************************************************* -\begin{pseudocode} -rnSpecDataSig :: RdrNameSpecDataSig - -> RnMS s RenamedSpecDataSig +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. -rnSpecDataSig (SpecDataSig tycon ty src_loc) - = pushSrcLocRn src_loc $ - let - tyvars = filter extractHsTyNames ty - in - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) -> - lookupOccRn tycon `thenRn` \ tycon' -> - rnHsType tv_env ty `thenRn` \ ty' -> - returnRn (SpecDataSig tycon' ty' src_loc) +\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} -\end{pseudocode} %********************************************************* -%* * -\subsection{@SPECIALIZE instance@ user-pragmas} -%* * +%* * +\subsection{Errors} +%* * %********************************************************* -\begin{pseudocode} -rnSpecInstSig :: RdrNameSpecInstSig - -> RnMS s RenamedSpecInstSig - -rnSpecInstSig (SpecInstSig clas ty src_loc) - = pushSrcLocRn src_loc $ - let - tyvars = extractHsTyNames is_tyvar_name ty - in - mkTyVarNamesEnv src_loc tyvars `thenRn` \ (tv_env,_) -> - lookupOccRn clas `thenRn` \ new_clas -> - rnHsType tv_env ty `thenRn` \ new_ty -> - returnRn (SpecInstSig new_clas new_ty src_loc) -\end{pseudocode} +\begin{code} +derivingNonStdClassErr clas + = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")] + +badDataCon name + = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)] + +forAllWarn doc ty tyvar + = ifOptRn Opt_WarnUnusedMatches $ + 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))] + $$ + (ptext SLIT("In") <+> doc) + ) + } + +badRuleLhsErr name lhs + = sep [ptext SLIT("Rule") <+> ptext name <> colon, + nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)] + $$ + 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")] + +badExtName :: ExtName -> Message +badExtName ext_nm + = sep [quotes (ppr ext_nm) <+> ptext SLIT("is not a valid C identifier")] + +dupClassAssertWarn ctxt (assertion : dups) + = sep [hsep [ptext SLIT("Duplicate class assertion"), + quotes (ppr assertion), + ptext SLIT("in the context:")], + nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))] + +naughtyCCallContextErr (HsClassP clas _) + = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas), + ptext SLIT("in a context")] +\end{code}