%
-% (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, rnHsSigType ) where
+module RnSource ( rnDecl, rnTyClDecl, rnRuleDecl, rnInstDecl,
+ rnSourceDecls, rnHsType, rnHsSigType
+ ) where
-IMP_Ubiq()
-IMPORT_DELOOPER(RnLoop) -- *check* the RnPass/RnExpr/RnBinds loop-breaking
-IMPORT_1_3(List(partition))
+#include "HsVersions.h"
+import RnExpr
import HsSyn
-import HsDecls ( HsIdInfo(..) )
-import HsPragmas
-import HsTypes ( getTyVarName )
-import RdrHsSyn
+import HsTypes ( hsTyVarNames, pprHsContext )
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, mkRdrNameWkr )
+import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl,
+ extractRuleBndrsTyVars, extractHsTyRdrTyVars,
+ extractHsCtxtRdrTyVars, extractGenericPatTyVars
+ )
import RnHsSyn
import HsCore
-import CmdLineOpts ( opt_IgnoreIfacePragmas )
-import RnBinds ( rnTopBinds, rnMethodBinds )
-import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, lookupImplicitOccRn, bindLocalsRn,
- lookupOptionalOccRn, newSysName, newDfunName, checkDupOrQualNames, checkDupNames,
- listType_RDR, tupleType_RDR )
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs )
+import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName,
+ lookupOrigNames, lookupSysBinder, newLocalsRn,
+ bindLocalsFVRn, bindUVarRn,
+ bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn,
+ bindCoreLocalFVRn, bindCoreLocalsFVRn, bindLocalNames,
+ checkDupOrQualNames, checkDupNames,
+ FreeVars, emptyFVs, plusFV, plusFVs, unitFV,
+ addOneFV, mapFvRn
+ )
import RnMonad
-import Name ( Name, isLocallyDefined,
- OccName(..), occNameString, prefixOccName,
- ExportFlag(..),
- Provenance,
- SYN_IE(NameSet), unionNameSets, emptyNameSet, mkNameSet, unitNameSet,
- elemNameSet
+import FunDeps ( oclose )
+import Class ( FunDep, DefMeth (..) )
+import Name ( Name, OccName, nameOccName, NamedThing(..) )
+import NameSet
+import FiniteMap ( elemFM )
+import PrelInfo ( derivableClassKeys, cCallishClassKeys )
+import PrelNames ( deRefStablePtr_RDR, makeStablePtr_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 Lex ( isLexCon )
-import CoreUnfold ( Unfolding(..), SimpleUnfolding )
-import MagicUFs ( MagicUnfoldingFun )
-import PrelInfo ( derivingOccurrences, evalClass_RDR, numClass_RDR, allClass_NAME )
-import ListSetOps ( unionLists, minusList )
-import Maybes ( maybeToBool, catMaybes )
-import Bag ( emptyBag, unitBag, consBag, unionManyBags, unionBags, listToBag, bagToList )
-import Outputable ( Outputable(..){-instances-} )
-import PprStyle
-import Pretty
+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 ErrUtils ( Message )
+import CStrings ( isCLabelString )
+import ListSetOps ( removeDupsEq )
\end{code}
-rnDecl `renames' declarations.
+@rnDecl@ `renames' declarations.
It simultaneously performs dependency analysis and precedence parsing.
It also does the following error checks:
\begin{enumerate}
\item
Checks that 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}
-rnDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl
+rnSourceDecls :: [RdrNameHsDecl] -> RnMS ([RenamedHsDecl], FreeVars)
+ -- The decls get reversed, but that's ok
-rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ new_binds ->
- returnRn (ValD new_binds)
+rnSourceDecls decls
+ = 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) = rnDecl d `thenRn` \(d', fvs') ->
+ go (fvs `plusFV` fvs') (d':ds') ds
+\end{code}
-rnDecl (SigD (IfaceSig name ty id_infos loc))
- = pushSrcLocRn loc $
- lookupBndrRn name `thenRn` \ name' ->
- rnHsType ty `thenRn` \ ty' ->
+%*********************************************************
+%* *
+\subsection{Value declarations}
+%* *
+%*********************************************************
+
+\begin{code}
+-- rnDecl does all the work
+rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
+
+rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
+ returnRn (ValD new_binds, fvs)
+
+rnDecl (TyClD tycl_decl) = rnTyClDecl tycl_decl `thenRn` \ (new_decl, fvs) ->
+ returnRn (TyClD new_decl, fvs)
+
+rnDecl (RuleD rule)
+ = rnRuleDecl rule `thenRn` \ (new_rule, fvs) ->
+ returnRn (RuleD new_rule, fvs)
- -- Get the pragma info, unless we should ignore it
- (if opt_IgnoreIfacePragmas then
- returnRn []
- else
- mapRn rnIdInfo id_infos
- ) `thenRn` \ id_infos' ->
+rnDecl (InstD inst)
+ = rnInstDecl inst `thenRn` \ (new_inst, fvs) ->
+ returnRn (InstD new_inst, fvs)
- returnRn (SigD (IfaceSig name' ty' id_infos' loc))
+rnDecl (DefD (DefaultDecl tys src_loc))
+ = pushSrcLocRn src_loc $
+ rnHsTypes doc_str tys `thenRn` \ (tys', fvs) ->
+ returnRn (DefD (DefaultDecl tys' src_loc), fvs)
+ where
+ doc_str = text "a `default' declaration"
+
+rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
+ = pushSrcLocRn src_loc $
+ lookupOccRn name `thenRn` \ name' ->
+ let
+ extra_fvs FoExport
+ | isDyn = lookupOrigNames [makeStablePtr_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 ->
+
+ rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs2) ->
+ returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc),
+ fvs1 `plusFV` fvs2)
+ where
+ fo_decl_msg = ptext SLIT("a foreign declaration")
+ isDyn = 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{Type declarations}
+\subsection{Instance 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))
+rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name 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))
- where
- data_doc sty = text "the data type declaration for" <+> ppr sty tycon
- con_names = map conDeclName condecls
+ rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
+ let
+ inst_tyvars = case inst_ty' of
+ HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars
+ other -> []
+ -- (Slightly strangely) the forall-d tyvars scope over
+ -- the method bindings too
+ in
-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))
+ -- 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 (
+ renameSigs (okInstDclSig binder_set) uprags
+ ) `thenRn` \ (new_uprags, prag_fvs) ->
+
+ (case maybe_dfun_rdr_name of
+ Nothing -> returnRn (Nothing, emptyFVs)
+
+ Just dfun_rdr_name -> lookupSysBinder dfun_rdr_name `thenRn` \ dfun_name ->
+ returnRn (Just dfun_name, unitFV dfun_name)
+ ) `thenRn` \ (maybe_dfun_name, dfun_fv) ->
+
+ -- The typechecker checks that all the bindings are for the right class.
+ returnRn (InstDecl inst_ty' mbinds' new_uprags maybe_dfun_name src_loc,
+ inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv)
where
- syn_doc sty = text "the declaration for type synonym" <+> ppr sty name
+ meth_doc = text "the bindings in an instance declaration"
+ meth_names = collectLocatedMonoBinders mbinds
\end{code}
%*********************************************************
%* *
-\subsection{Class declarations}
+\subsection{Rules}
%* *
%*********************************************************
-@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))
- = pushSrcLocRn src_loc $
- bindTyVarsRn cls_doc [tyvar] $ \ [tyvar'] ->
- rnContext context `thenRn` \ context' ->
- lookupBndrRn cname `thenRn` \ cname' ->
+rnRuleDecl (IfaceRule rule_name vars fn args rhs src_loc)
+ = pushSrcLocRn src_loc $
+ lookupOccRn fn `thenRn` \ fn' ->
+ rnCoreBndrs vars $ \ vars' ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn (IfaceRule rule_name vars' fn' args' rhs' src_loc,
+ (fvs1 `plusFV` fvs2) `addOneFV` fn')
+
+rnRuleDecl (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
+ doc = text "the transformation rule" <+> ptext rule_name
+ sig_tvs = extractRuleBndrsTyVars vars
+
+ get_var (RuleBndr v) = v
+ get_var (RuleBndrSig v _) = v
+
+ rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
+ rn_var (RuleBndrSig v t, id) = rnHsType doc t `thenRn` \ (t', fvs) ->
+ returnRn (RuleBndrSig id t', fvs)
+\end{code}
- -- Check the signatures
- checkDupOrQualNames sig_doc sig_names `thenRn_`
- mapRn (rn_op cname' (getTyVarName tyvar')) sigs `thenRn` \ sigs' ->
+%*********************************************************
+%* *
+\subsection{Type, class and iface sig declarations}
+%* *
+%*********************************************************
- -- Check the methods
- checkDupOrQualNames meth_doc meth_names `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
+@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.
- -- 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.
+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.
- ASSERT(isNoClassPragmas pragmas)
- returnRn (ClD (ClassDecl context' cname' tyvar' sigs' mbinds' NoClassPragmas src_loc))
+\begin{code}
+rnTyClDecl (IfaceSig name ty id_infos loc)
+ = pushSrcLocRn loc $
+ lookupTopBndrRn name `thenRn` \ name' ->
+ rnHsType doc_str ty `thenRn` \ (ty',fvs1) ->
+ mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) ->
+ returnRn (IfaceSig name' ty' id_infos' loc, fvs1 `plusFV` fvs2)
where
- cls_doc sty = text "the declaration for class" <+> ppr sty cname
- sig_doc sty = text "the signatures for class" <+> ppr sty cname
- meth_doc sty = text "the default-methods for class" <+> ppr sty cname
+ doc_str = text "the interface signature for" <+> quotes (ppr name)
- sig_names = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
- meth_names = bagToList (collectMonoBinders mbinds)
-
- rn_op clas clas_tyvar sig@(ClassOpSig op _ ty locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- rnHsSigType (\sty -> ppr sty op) ty `thenRn` \ new_ty ->
+rnTyClDecl (TyData new_or_data context tycon tyvars condecls nconstrs derivings src_loc gen_name1 gen_name2)
+ = pushSrcLocRn src_loc $
+ lookupTopBndrRn tycon `thenRn` \ tycon' ->
+ bindTyVarsFVRn data_doc tyvars $ \ tyvars' ->
+ rnContext data_doc context `thenRn` \ (context', cxt_fvs) ->
+ checkDupOrQualNames data_doc con_names `thenRn_`
+ mapFvRn rnConDecl condecls `thenRn` \ (condecls', con_fvs) ->
+ lookupSysBinder gen_name1 `thenRn` \ name1' ->
+ lookupSysBinder gen_name2 `thenRn` \ name2' ->
+ rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) ->
+ returnRn (TyData new_or_data context' tycon' tyvars' condecls' nconstrs
+ derivings' src_loc name1' name2',
+ cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs)
+ where
+ data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
+ con_names = map conDeclName condecls
- -- Call up interface info for default method, if such info exists
- let
- dm_occ = prefixOccName SLIT("$m") (rdrNameOcc op)
- in
- newSysName dm_occ Exported locn `thenRn` \ dm_name ->
- addOccurrenceName Optional dm_name `thenRn_`
-
+rnTyClDecl (TySynonym name tyvars ty src_loc)
+ = pushSrcLocRn src_loc $
+ doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
+ lookupTopBndrRn name `thenRn` \ name' ->
+ bindTyVarsFVRn syn_doc tyvars $ \ tyvars' ->
+ rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ (ty', ty_fvs) ->
+ returnRn (TySynonym name' tyvars' ty' src_loc, ty_fvs)
+ where
+ syn_doc = text "the declaration for type synonym" <+> quotes (ppr name)
- -- Checks.....
- 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_`
+ -- 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
+ unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty
+ unquantify glaExys ty = ty
- -- Check that class tyvar *doesn't* appear in the sig's context
- checkRn (not (clas_tyvar `elemNameSet` ctxt_fvs))
- (classTyVarInOpCtxtErr clas_tyvar sig)
- `thenRn_`
+rnTyClDecl (ClassDecl context cname tyvars fds sigs mbinds names src_loc)
+ = pushSrcLocRn src_loc $
- returnRn (ClassOpSig op_name dm_name new_ty locn)
-\end{code}
+ 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!
+ -- So the 'Imported' part of this call is not relevant.
+ -- Unclean; but since these two are the only place this happens
+ -- I can't work up the energy to do it more beautifully
-%*********************************************************
-%* *
-\subsection{Instance declarations}
-%* *
-%*********************************************************
+ mapRn lookupSysBinder names `thenRn` \ names' ->
-\begin{code}
-rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun src_loc))
- = pushSrcLocRn src_loc $
- rnHsSigType (\sty -> text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
+ -- Tyvars scope over bindings and context
+ bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' ->
+ -- Check the superclasses
+ rnContext cls_doc context `thenRn` \ (context', cxt_fvs) ->
- -- 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 ->
+ -- Check the functional dependencies
+ rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) ->
- newDfunName maybe_dfun src_loc `thenRn` \ dfun_name ->
- addOccurrenceName Compulsory dfun_name `thenRn_`
- -- The dfun is not optional, because we use its version number
- -- to identify the version of the instance declaration
+ -- 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_`
+ mapFvRn (rn_op cname' clas_tyvar_names fds') op_sigs `thenRn` \ (sigs', sig_fvs) ->
+ let
+ binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
+ in
+ renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ (non_ops', fix_fvs) ->
- -- 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 sty = text "the bindings in an instance declaration"
- meth_names = bagToList (collectMonoBinders mbinds)
+ -- Check the methods
+ -- 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
+ 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 `elemFM` name_env)]
+ in
+ checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
+ newLocalsRn mkLocalName gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars ->
+ rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
- rn_uprag (SpecSig op ty using locn)
- = pushSrcLocRn src_loc $
- lookupBndrRn op `thenRn` \ op_name ->
- rnHsSigType (\sty -> ppr sty op) ty `thenRn` \ new_ty ->
- rn_using using `thenRn` \ new_using ->
- returnRn (SpecSig op_name new_ty new_using locn)
+ -- 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.
- rn_uprag (InlineSig op locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (InlineSig op_name locn)
+ returnRn (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') mbinds'
+ names' src_loc,
+ sig_fvs `plusFV`
- rn_uprag (DeforestSig op locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (DeforestSig op_name locn)
+ fix_fvs `plusFV`
+ cxt_fvs `plusFV`
+ fds_fvs `plusFV`
+ meth_fvs
+ )
+ )
+ where
+ cls_doc = text "the declaration for class" <+> ppr cname
+ sig_doc = text "the signatures for class" <+> ppr cname
+ meth_doc = text "the default-methods for class" <+> ppr cname
- rn_uprag (MagicUnfoldingSig op str locn)
+ rn_op clas clas_tyvars clas_fds sig@(ClassOpSig op maybe_dm_stuff ty locn)
= pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (MagicUnfoldingSig op_name str locn)
+ lookupTopBndrRn op `thenRn` \ op_name ->
- rn_using Nothing = returnRn Nothing
- rn_using (Just v) = lookupOccRn v `thenRn` \ new_v ->
- returnRn (Just new_v)
+ -- Check the signature
+ rnHsSigType (quotes (ppr op)) ty `thenRn` \ (new_ty, op_ty_fvs) ->
+ let
+ check_in_op_ty clas_tyvar =
+ checkRn (clas_tyvar `elemNameSet` oclose clas_fds op_ty_fvs)
+ (classTyVarNotInOpTyErr clas_tyvar sig)
+ in
+ mapRn_ check_in_op_ty clas_tyvars `thenRn_`
+
+ -- Make the default-method name
+ (case maybe_dm_stuff of
+ Nothing -> returnRn (Nothing, emptyFVs) -- Source-file class decl
+
+ Just (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 (Just (DefMeth dm_name), unitFV 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
+ Just GenDefMeth
+ -> returnRn (Just GenDefMeth, emptyFVs)
+ Just NoDefMeth
+ -> returnRn (Just NoDefMeth, emptyFVs)
+ ) `thenRn` \ (maybe_dm_stuff', dm_fvs) ->
+
+ returnRn (ClassOpSig op_name maybe_dm_stuff' new_ty locn, op_ty_fvs `plusFV` dm_fvs)
\end{code}
-%*********************************************************
-%* *
-\subsection{Default declarations}
-%* *
-%*********************************************************
-
-\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))
-\end{code}
%*********************************************************
%* *
%*********************************************************
\begin{code}
-rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name])
+rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name], FreeVars)
rnDerivs Nothing -- derivs not specified
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- returnRn Nothing
+ = returnRn (Nothing, emptyFVs)
-rnDerivs (Just ds)
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- mapRn rn_deriv ds `thenRn` \ derivs ->
- returnRn (Just derivs)
+rnDerivs (Just clss)
+ = mapRn do_one clss `thenRn` \ clss' ->
+ returnRn (Just clss', mkNameSet clss')
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
+ do_one cls = lookupOccRn cls `thenRn` \ clas_name ->
+ checkRn (getUnique clas_name `elem` derivableClassKeys)
+ (derivingNonStdClassErr clas_name) `thenRn_`
+ returnRn clas_name
\end{code}
\begin{code}
conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
-conDeclName (ConDecl n _ _ l) = (n,l)
+conDeclName (ConDecl n _ _ _ _ l) = (n,l)
-rnConDecl :: RdrNameConDecl -> RnMS s RenamedConDecl
-rnConDecl (ConDecl name cxt details locn)
+rnConDecl :: RdrNameConDecl -> RnMS (RenamedConDecl, FreeVars)
+rnConDecl (ConDecl name wkr tvs cxt details locn)
= pushSrcLocRn locn $
- checkConName name `thenRn_`
- lookupBndrRn name `thenRn` \ new_name ->
- rnConDetails name locn details `thenRn` \ new_details ->
- rnContext cxt `thenRn` \ new_context ->
- returnRn (ConDecl new_name new_context new_details locn)
-
-rnConDetails con locn (VanillaCon tys)
- = mapRn rnBangTy tys `thenRn` \ new_tys ->
- returnRn (VanillaCon new_tys)
-
-rnConDetails con locn (InfixCon ty1 ty2)
- = rnBangTy ty1 `thenRn` \ new_ty1 ->
- rnBangTy ty2 `thenRn` \ new_ty2 ->
- returnRn (InfixCon new_ty1 new_ty2)
-
-rnConDetails con locn (NewCon ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (NewCon new_ty)
-
-rnConDetails con locn (RecCon fields)
- = checkDupOrQualNames fld_doc field_names `thenRn_`
- mapRn rnField fields `thenRn` \ new_fields ->
- returnRn (RecCon new_fields)
+ checkConName name `thenRn_`
+ lookupTopBndrRn name `thenRn` \ new_name ->
+
+ lookupSysBinder wkr `thenRn` \ new_wkr ->
+ -- See comments with ClassDecl
+
+ bindTyVarsFVRn doc tvs $ \ new_tyvars ->
+ rnContext doc cxt `thenRn` \ (new_context, cxt_fvs) ->
+ rnConDetails doc locn details `thenRn` \ (new_details, det_fvs) ->
+ returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn,
+ cxt_fvs `plusFV` det_fvs)
+ where
+ doc = text "the definition of data constructor" <+> quotes (ppr name)
+
+rnConDetails doc locn (VanillaCon tys)
+ = mapFvRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs) ->
+ returnRn (VanillaCon new_tys, fvs)
+
+rnConDetails doc locn (InfixCon ty1 ty2)
+ = rnBangTy doc ty1 `thenRn` \ (new_ty1, fvs1) ->
+ rnBangTy doc ty2 `thenRn` \ (new_ty2, fvs2) ->
+ returnRn (InfixCon new_ty1 new_ty2, fvs1 `plusFV` fvs2)
+
+rnConDetails doc locn (RecCon fields)
+ = checkDupOrQualNames doc field_names `thenRn_`
+ mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) ->
+ returnRn (RecCon new_fields, fvs)
where
- fld_doc sty = text "the fields of constructor" <> ppr sty con
field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
-rnField (names, ty)
- = mapRn lookupBndrRn names `thenRn` \ new_names ->
- rnBangTy ty `thenRn` \ new_ty ->
- returnRn (new_names, new_ty)
+rnField doc (names, ty)
+ = mapRn lookupTopBndrRn names `thenRn` \ new_names ->
+ rnBangTy doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn ((new_names, new_ty), fvs)
+
+rnBangTy doc (Banged ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Banged new_ty, fvs)
-rnBangTy (Banged ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (Banged new_ty)
+rnBangTy doc (Unbanged ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Unbanged new_ty, fvs)
-rnBangTy (Unbanged ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (Unbanged new_ty)
+rnBangTy doc (Unpacked ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Unpacked new_ty, fvs)
-- This data decl will parse OK
-- data T = a Int
-- from interface files, which always print in prefix form
checkConName name
- = checkRn (isLexCon (occNameString (rdrNameOcc name)))
+ = checkRn (isRdrDataCon name)
(badDataCon name)
\end{code}
%*********************************************************
\begin{code}
-rnHsSigType :: (PprStyle -> Doc) -> RdrNameHsType -> RnMS s RenamedHsType
+rnHsSigType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
-- rnHsSigType is used for source-language type signatures,
-- which use *implicit* universal quantification.
-
-rnHsSigType doc_str full_ty@(HsPreForAllTy ctxt ty) -- From source code (no kinds on tyvars)
- = getNameEnv `thenRn` \ name_env ->
+rnHsSigType doc_str ty
+ = rnHsType (text "the type signature for" <+> doc_str) ty
+
+---------------------------------------
+rnHsType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
+
+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
-
- non_foralld_constrained = [tv | (clas, ty) <- ctxt,
- tv <- extractHsTyVars ty,
- not (tv `elem` forall_tyvars)
- ]
+ mentioned_in_tau = extractHsTyRdrTyVars ty
+ mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
+ mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
+ forall_tyvars = filter (not . (`elemFM` name_env)) mentioned
in
--- checkRn (null non_foralld_constrained)
--- (ctxtErr sig_doc non_foralld_constrained) `thenRn_`
-
- (bindTyVarsRn sig_doc (map UserTyVar forall_tyvars) $ \ new_tyvars ->
- rnContext ctxt `thenRn` \ new_ctxt ->
- rnHsType ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
- )
- where
- sig_doc sty = text "the type signature for" <+> doc_str sty
-
-
-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
- = getNameEnv `thenRn` \ name_env ->
- let
- forall_tyvars = foldr unionLists [] (map (extractHsTyVars . snd) ctxt)
+ rnForAll doc (map UserTyVar forall_tyvars) ctxt ty
+
+rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau)
+ -- Explicit quantification.
+ -- Check that the forall'd tyvars are 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
- rn_poly_help (map UserTyVar forall_tyvars) ctxt ty
+ 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 ty1 ty2)
- = rnHsType ty1 `thenRn` \ ty1' ->
- rnHsType ty2 `thenRn` \ ty2' ->
- returnRn (MonoTyApp ty1' ty2')
-
-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 sig_doc tyvars $ \ new_tyvars ->
- rnContext ctxt `thenRn` \ new_ctxt ->
- rnHsType ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
+ returnRn (HsTyVar tyvar', unitFV tyvar')
+
+rnHsType doc (HsOpTy ty1 opname ty2)
+ = lookupOccRn opname `thenRn` \ name' ->
+ rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2',fvs2) ->
+ returnRn (HsOpTy ty1' name' ty2', fvs1 `plusFV` fvs2 `addOneFV` name')
+
+rnHsType doc (HsNumTy i)
+ | i == 1 = returnRn (HsNumTy i, emptyFVs)
+ | otherwise = failWithRn (HsNumTy i, emptyFVs)
+ (ptext SLIT("Only unit numeric type pattern is valid"))
+
+rnHsType doc (HsFunTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ -- Might find a for-all as the arg of a function type
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ -- 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', fvs1 `plusFV` fvs2)
+
+rnHsType doc (HsListTy ty)
+ = rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsListTy ty', fvs `addOneFV` listTyCon_name)
+
+-- 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) tys)
+ -- Don't do lookupOccRn, because this is built-in syntax
+ -- so it doesn't need to be in scope
+ = mapFvRn (rnHsType doc) tys `thenRn` \ (tys', fvs) ->
+ returnRn (HsTupleTy (HsTupCon n' boxity) tys', fvs `addOneFV` n')
where
- sig_doc sty = text "a nested for-all type"
+ n' = tupleTyCon_name boxity (length tys)
+
+
+rnHsType doc (HsAppTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ returnRn (HsAppTy ty1' ty2', fvs1 `plusFV` fvs2)
+
+rnHsType doc (HsPredTy pred)
+ = rnPred doc pred `thenRn` \ (pred', fvs) ->
+ returnRn (HsPredTy pred', fvs)
+
+rnHsType doc (HsUsgForAllTy uv_rdr ty)
+ = bindUVarRn doc uv_rdr $ \ uv_name ->
+ rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsUsgForAllTy uv_name ty',
+ fvs )
+
+rnHsType doc (HsUsgTy usg ty)
+ = newUsg usg `thenRn` \ (usg', usg_fvs) ->
+ rnHsType doc ty `thenRn` \ (ty', ty_fvs) ->
+ -- A for-all can occur inside a usage annotation
+ returnRn (HsUsgTy usg' ty',
+ usg_fvs `plusFV` ty_fvs)
+ where
+ newUsg usg = case usg of
+ HsUsOnce -> returnRn (HsUsOnce, emptyFVs)
+ HsUsMany -> returnRn (HsUsMany, emptyFVs)
+ HsUsVar uv_rdr -> lookupOccRn uv_rdr `thenRn` \ uv_name ->
+ returnRn (HsUsVar uv_name, emptyFVs)
+
+rnHsTypes doc tys = mapFvRn (rnHsType doc) tys
\end{code}
+\begin{code}
+-- We use lookupOcc here because this is interface file only stuff
+-- and we need the workers...
+rnHsTupCon (HsTupCon n boxity)
+ = lookupOccRn n `thenRn` \ n' ->
+ returnRn (HsTupCon n' boxity, unitFV n')
+
+rnHsTupConWkr (HsTupCon n boxity)
+ -- Tuple construtors are for the *worker* of the tuple
+ -- Going direct saves needless messing about
+ = lookupOccRn (mkRdrNameWkr n) `thenRn` \ n' ->
+ returnRn (HsTupCon n' boxity, unitFV n')
+\end{code}
\begin{code}
-rnContext :: RdrNameContext -> RnMS s RenamedContext
+rnForAll doc forall_tyvars ctxt ty
+ = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars ->
+ rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) ->
+ rnHsType doc ty `thenRn` \ (new_ty, ty_fvs) ->
+ returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty,
+ cxt_fvs `plusFV` ty_fvs)
+\end{code}
-rnContext ctxt
- = mapRn rn_ctxt ctxt `thenRn` \ result ->
+\begin{code}
+rnContext :: SDoc -> RdrNameContext -> RnMS (RenamedContext, FreeVars)
+rnContext doc ctxt
+ = mapAndUnzipRn rn_pred ctxt `thenRn` \ (theta, fvs_s) ->
let
- (_, dup_asserts) = removeDups cmp_assert result
- (alls, theta) = partition (\(c,_) -> c == allClass_NAME) result
- non_tyvar_alls = [(c,t) | (c,t) <- alls, not (is_tyvar t)]
+ (_, dups) = removeDupsEq theta
+ -- We only have equality, not ordering
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 (addWarnRn . allOfNonTyVar) non_tyvar_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
+ mapRn (addWarnRn . dupClassAssertWarn theta) dups `thenRn_`
+ returnRn (theta, plusFVs fvs_s)
where
- rn_ctxt (clas, ty)
- = -- 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 Compulsory clas_name
- else
- returnRn clas_name
- ) `thenRn_`
- rnHsType ty `thenRn` \ ty' ->
- returnRn (clas_name, ty')
-
- cmp_assert (c1,ty1) (c2,ty2)
- = (c1 `cmp` c2) `thenCmp` (cmpHsType cmp ty1 ty2)
-
- is_tyvar (MonoTyVar _) = True
- is_tyvar other = False
+ --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', fvs)->
+ checkRn (not (bad_pred pred'))
+ (naughtyCCallContextErr pred') `thenRn_`
+ returnRn (pred', fvs)
+
+ bad_pred (HsPClass clas _) = getUnique clas `elem` cCallishClassKeys
+ bad_pred other = False
+
+
+rnPred doc (HsPClass clas tys)
+ = lookupOccRn clas `thenRn` \ clas_name ->
+ rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
+ returnRn (HsPClass clas_name tys', fvs `addOneFV` clas_name)
+
+rnPred doc (HsPIParam n ty)
+ = newIPName n `thenRn` \ name ->
+ rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsPIParam name ty', fvs)
\end{code}
+\begin{code}
+rnFds :: SDoc -> [FunDep RdrName] -> RnMS ([FunDep Name], FreeVars)
+
+rnFds doc fds
+ = mapAndUnzipRn rn_fds fds `thenRn` \ (theta, fvs_s) ->
+ returnRn (theta, plusFVs fvs_s)
+ where
+ rn_fds (tys1, tys2)
+ = rnHsTyVars doc tys1 `thenRn` \ (tys1', fvs1) ->
+ rnHsTyVars doc tys2 `thenRn` \ (tys2', fvs2) ->
+ returnRn ((tys1', tys2'), fvs1 `plusFV` fvs2)
+
+rnHsTyVars doc tvs = mapFvRn (rnHsTyvar doc) tvs
+rnHsTyvar doc tyvar
+ = lookupOccRn tyvar `thenRn` \ tyvar' ->
+ returnRn (tyvar', unitFV tyvar')
+\end{code}
%*********************************************************
-%* *
+%* *
\subsection{IdInfo}
-%* *
+%* *
%*********************************************************
\begin{code}
-rnIdInfo (HsStrictness strict)
- = rnStrict strict `thenRn` \ strict' ->
- returnRn (HsStrictness strict')
-
-rnIdInfo (HsUnfold expr) = rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (HsUnfold 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)
-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 (HsStrictness str) = returnRn (HsStrictness str, emptyFVs)
+
+rnIdInfo (HsWorker worker)
+ = lookupOccRn worker `thenRn` \ worker' ->
+ returnRn (HsWorker worker', unitFV worker')
+
+rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ (expr', fvs) ->
+ returnRn (HsUnfold inline expr', fvs)
+rnIdInfo (HsArity arity) = returnRn (HsArity arity, emptyFVs)
+rnIdInfo HsNoCafRefs = returnRn (HsNoCafRefs, emptyFVs)
+rnIdInfo HsCprInfo = returnRn (HsCprInfo, emptyFVs)
+
\end{code}
-UfCore expressions.
+@UfCore@ expressions.
\begin{code}
-rnCoreExpr (UfVar v)
- = lookupOptionalOccRn v `thenRn` \ v' ->
- returnRn (UfVar v')
+rnCoreExpr (UfType ty)
+ = rnHsType (text "unfolding type") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfType ty', fvs)
-rnCoreExpr (UfLit lit) = returnRn (UfLit lit)
+rnCoreExpr (UfVar v)
+ = lookupOccRn v `thenRn` \ v' ->
+ returnRn (UfVar v', unitFV v')
-rnCoreExpr (UfCon con args)
- = lookupOptionalOccRn con `thenRn` \ con' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfCon con' args')
+rnCoreExpr (UfLit l)
+ = returnRn (UfLit l, emptyFVs)
-rnCoreExpr (UfPrim prim args)
- = rnCorePrim prim `thenRn` \ prim' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfPrim prim' args')
+rnCoreExpr (UfLitLit l ty)
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfLitLit l ty', fvs)
-rnCoreExpr (UfApp fun arg)
- = rnCoreExpr fun `thenRn` \ fun' ->
- rnCoreArg arg `thenRn` \ arg' ->
- returnRn (UfApp fun' arg')
+rnCoreExpr (UfCCall cc ty)
+ = rnHsType (text "ccall") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfCCall cc ty', fvs)
-rnCoreExpr (UfCase scrut alts)
- = rnCoreExpr scrut `thenRn` \ scrut' ->
- rnCoreAlts alts `thenRn` \ alts' ->
- returnRn (UfCase scrut' alts')
+rnCoreExpr (UfTuple con args)
+ = rnHsTupConWkr con `thenRn` \ (con', fvs1) ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs2) ->
+ returnRn (UfTuple con' args', fvs1 `plusFV` fvs2)
-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 (UfApp fun arg)
+ = rnCoreExpr fun `thenRn` \ (fun', fv1) ->
+ rnCoreExpr arg `thenRn` \ (arg', fv2) ->
+ returnRn (UfApp fun' arg', fv1 `plusFV` fv2)
+
+rnCoreExpr (UfCase scrut bndr alts)
+ = rnCoreExpr scrut `thenRn` \ (scrut', fvs1) ->
+ bindCoreLocalFVRn bndr ( \ bndr' ->
+ mapFvRn rnCoreAlt alts `thenRn` \ (alts', fvs2) ->
+ returnRn (UfCase scrut' bndr' alts', fvs2)
+ ) `thenRn` \ (case', fvs3) ->
+ returnRn (case', fvs1 `plusFV` fvs3)
+
+rnCoreExpr (UfNote note expr)
+ = rnNote note `thenRn` \ (note', fvs1) ->
+ rnCoreExpr expr `thenRn` \ (expr', fvs2) ->
+ returnRn (UfNote note' expr', fvs1 `plusFV` fvs2)
rnCoreExpr (UfLam bndr body)
= rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLam bndr' body')
+ rnCoreExpr body `thenRn` \ (body', fvs) ->
+ returnRn (UfLam bndr' body', fvs)
rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
- = rnCoreExpr rhs `thenRn` \ rhs' ->
- rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfNonRec bndr' rhs') body')
+ = rnCoreExpr rhs `thenRn` \ (rhs', fvs1) ->
+ rnCoreBndr bndr ( \ bndr' ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfNonRec bndr' rhs') body', fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
rnCoreExpr (UfLet (UfRec pairs) body)
= rnCoreBndrs bndrs $ \ bndrs' ->
- mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
+ mapFvRn rnCoreExpr rhss `thenRn` \ (rhss', fvs1) ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body', fvs1 `plusFV` fvs2)
where
(bndrs, rhss) = unzip pairs
\end{code}
\begin{code}
rnCoreBndr (UfValBinder name ty) thing_inside
- = rnHsType ty `thenRn` \ ty' ->
- bindLocalsRn "unfolding value" [name] $ \ [name'] ->
- thing_inside (UfValBinder name' ty')
+ = rnHsType doc ty `thenRn` \ (ty', fvs1) ->
+ bindCoreLocalFVRn name ( \ name' ->
+ thing_inside (UfValBinder name' ty')
+ ) `thenRn` \ (result, fvs2) ->
+ returnRn (result, fvs1 `plusFV` fvs2)
+ where
+ doc = text "unfolding id"
rnCoreBndr (UfTyBinder name kind) thing_inside
- = bindLocalsRn "unfolding tyvar" [name] $ \ [name'] ->
+ = bindCoreLocalFVRn name $ \ name' ->
thing_inside (UfTyBinder name' kind)
-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
-
-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) = 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' ->
- 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 bndrs `thenRn` \ (con', fvs1) ->
+ bindCoreLocalsFVRn bndrs ( \ bndrs' ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn ((con', bndrs', rhs'), fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
+
+rnNote (UfCoerce ty)
+ = rnHsType (text "unfolding coerce") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfCoerce ty', fvs)
+
+rnNote (UfSCC cc) = returnRn (UfSCC cc, emptyFVs)
+rnNote UfInlineCall = returnRn (UfInlineCall, emptyFVs)
+rnNote UfInlineMe = returnRn (UfInlineMe, emptyFVs)
+
+
+rnUfCon UfDefault _
+ = returnRn (UfDefault, emptyFVs)
-rnCoreDefault UfNoDefault = returnRn UfNoDefault
-rnCoreDefault (UfBindDefault bndr rhs) = bindLocalsRn "unfolding default" [bndr] $ \ [bndr'] ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (UfBindDefault bndr' rhs')
+rnUfCon (UfTupleAlt tup_con) bndrs
+ = rnHsTupCon tup_con `thenRn` \ (HsTupCon con' _, fvs) ->
+ returnRn (UfDataAlt con', fvs)
+ -- Makes the type checker a little easier
-rnCoercion (UfIn n) = lookupOptionalOccRn n `thenRn` \ n' -> returnRn (UfIn n')
-rnCoercion (UfOut n) = lookupOptionalOccRn n `thenRn` \ n' -> returnRn (UfOut n')
+rnUfCon (UfDataAlt con) _
+ = lookupOccRn con `thenRn` \ con' ->
+ returnRn (UfDataAlt con', unitFV con')
-rnCorePrim (UfOtherOp op)
- = lookupOptionalOccRn op `thenRn` \ op' ->
- returnRn (UfOtherOp op')
+rnUfCon (UfLitAlt lit) _
+ = returnRn (UfLitAlt lit, emptyFVs)
-rnCorePrim (UfCCallOp str casm gc arg_tys res_ty)
- = mapRn rnHsType arg_tys `thenRn` \ arg_tys' ->
- rnHsType res_ty `thenRn` \ res_ty' ->
- returnRn (UfCCallOp str casm gc arg_tys' res_ty')
+rnUfCon (UfLitLitAlt lit ty) _
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfLitLitAlt lit ty', fvs)
\end{code}
%*********************************************************
-%* *
+%* *
+\subsection{Rule shapes}
+%* *
+%*********************************************************
+
+Check the shape of a transformation rule LHS. Currently
+we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
+not one of the @forall@'d variables.
+
+\begin{code}
+validRuleLhs foralls lhs
+ = check lhs
+ where
+ check (HsApp e1 e2) = check e1
+ check (HsVar v) | v `notElem` foralls = True
+ check other = False
+\end{code}
+
+
+%*********************************************************
+%* *
\subsection{Errors}
-%* *
+%* *
%*********************************************************
\begin{code}
-derivingNonStdClassErr clas sty
- = hsep [ptext SLIT("non-standard class in deriving:"), ppr sty clas]
-
-classTyVarNotInOpTyErr clas_tyvar sig sty
- = hang (hcat [ptext SLIT("Class type variable `"),
- ppr sty clas_tyvar,
- ptext SLIT("' does not appear in method signature:")])
- 4 (ppr sty sig)
-
-classTyVarInOpCtxtErr clas_tyvar sig sty
- = hang (hcat [ ptext SLIT("Class type variable `"), ppr sty clas_tyvar,
- ptext SLIT("' present in method's local overloading context:")])
- 4 (ppr sty sig)
-
-dupClassAssertWarn ctxt dups sty
- = hang (hcat [ptext SLIT("Duplicate class assertion `"),
- ppr sty dups,
- ptext SLIT("' in context:")])
- 4 (ppr sty ctxt)
-
-badDataCon name sty
- = hsep [ptext SLIT("Illegal data constructor name:"), ppr sty name]
-
-allOfNonTyVar ty sty
- = hsep [ptext SLIT("`All' applied to a non-type variable:"), ppr sty ty]
-
-ctxtErr doc tyvars sty
- = hsep [ptext SLIT("Context constrains type variable(s)"),
- hsep (punctuate comma (map (ppr sty) tyvars))]
- $$ nest 4 (ptext SLIT("in") <+> doc sty)
+derivingNonStdClassErr clas
+ = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")]
+
+classTyVarNotInOpTyErr clas_tyvar sig
+ = hang (hsep [ptext SLIT("Class type variable"),
+ quotes (ppr clas_tyvar),
+ ptext SLIT("does not appear in method signature")])
+ 4 (ppr sig)
+
+badDataCon name
+ = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
+
+forAllWarn doc ty tyvar
+ = doptRn Opt_WarnUnusedMatches `thenRn` \ warn_unused -> case () of
+ () | not warn_unused -> returnRn ()
+ | otherwise
+ -> getModeRn `thenRn` \ mode ->
+ case mode of {
+#ifndef DEBUG
+ InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files
+ -- unless DEBUG is on, in which case it is slightly
+ -- informative. They can arise from mkRhsTyLam,
+#endif -- leading to (say) f :: forall a b. [b] -> [b]
+ other ->
+ addWarnRn (
+ sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ $$
+ (ptext SLIT("In") <+> doc)
+ )
+ }
+
+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 (HsPClass clas _)
+ = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas),
+ ptext SLIT("in a context")]
\end{code}