%
-% (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
-
-IMPORT_1_3(List(partition))
-IMP_Ubiq()
+module RnSource (
+ rnSrcDecls, addTcgDUs,
+ rnTyClDecls, checkModDeprec,
+ rnBindGroups, rnBindGroupsAndThen, rnSplice
+ ) where
-#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
-IMPORT_DELOOPER(RnLoop) -- *check* the RnPass/RnExpr/RnBinds loop-breaking
-#else
-import RnExpr
---import {-# SOURCE #-} RnExpr
-#endif
+#include "HsVersions.h"
import HsSyn
-import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
-import HsPragmas
-import HsTypes ( getTyVarName )
-import RdrHsSyn
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, elemLocalRdrEnv )
+import RdrHsSyn ( extractGenericPatTyVars )
import RnHsSyn
-import HsCore
-import CmdLineOpts ( opt_IgnoreIfacePragmas )
-
-import RnBinds ( rnTopBinds, rnMethodBinds )
-import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, lookupImplicitOccRn, bindLocalsRn,
- newDfunName, checkDupOrQualNames, checkDupNames,
- newLocallyDefinedGlobalName, newGlobalName, ifaceFlavour,
- listType_RDR, tupleType_RDR )
-import RnMonad
-
-import Name ( Name, isLocallyDefined,
- OccName(..), occNameString, prefixOccName,
- ExportFlag(..),
- Provenance(..), getNameProvenance,
- SYN_IE(NameSet), unionNameSets, emptyNameSet, mkNameSet, unitNameSet,
- elemNameSet
+import RnExpr ( rnLExpr, checkTH )
+import RnTypes ( rnLHsType, rnLHsTypes, rnHsSigType, rnHsTypeFVs, rnContext )
+import RnBinds ( rnTopBinds, rnBinds, rnMethodBinds,
+ rnBindsAndThen, renameSigs, checkSigs )
+import RnEnv ( lookupTopBndrRn, lookupTopFixSigNames,
+ lookupLocatedTopBndrRn, lookupLocatedOccRn,
+ lookupOccRn, newLocalsRn,
+ bindLocatedLocalsFV, bindPatSigTyVarsFV,
+ bindTyVarsRn, extendTyVarEnvFVRn,
+ bindLocalNames, newIPNameRn,
+ checkDupNames, mapFvRn,
+ unknownNameErr
)
-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 ( PprStyle(..), Outputable(..){-instances-}, pprQuote )
-import Pretty
-import SrcLoc ( SrcLoc )
-import Unique ( Unique )
-import UniqSet ( SYN_IE(UniqSet) )
-import UniqFM ( UniqFM, lookupUFM )
-import Util
-IMPORT_1_3(List(nub))
+import TcRnMonad
+
+import BasicTypes ( TopLevelFlag(..) )
+import HscTypes ( FixityEnv, FixItem(..),
+ Deprecations, Deprecs(..), DeprecTxt, plusDeprecs )
+import Class ( FunDep )
+import Name ( Name, nameOccName )
+import NameSet
+import NameEnv
+import Outputable
+import SrcLoc ( Located(..), unLoc, getLoc, noLoc )
+import CmdLineOpts ( DynFlag(..) )
+ -- Warn of unused for-all'd tyvars
+import Maybes ( seqMaybe )
+import Maybe ( catMaybes, isNothing )
\end{code}
-rnDecl `renames' declarations.
+@rnSourceDecl@ `renames' declarations.
It simultaneously performs dependency analysis and precedence parsing.
It also does the following error checks:
\begin{enumerate}
\item
Checks that tyvars are used properly. This includes checking
for undefined tyvars, and tyvars in contexts that are ambiguous.
+(Some of this checking has now been moved to module @TcMonoType@,
+since we don't have functional dependency information at this point.)
\item
Checks that all variable occurences are defined.
\item
-Checks the (..) etc constraints in the export list.
+Checks the @(..)@ etc constraints in the export list.
\end{enumerate}
+\begin{code}
+rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name)
+
+rnSrcDecls (HsGroup { hs_valds = [HsBindGroup binds sigs _],
+ hs_tyclds = tycl_decls,
+ hs_instds = inst_decls,
+ hs_fixds = fix_decls,
+ hs_depds = deprec_decls,
+ hs_fords = foreign_decls,
+ hs_defds = default_decls,
+ hs_ruleds = rule_decls })
+
+ = do { -- Deal with deprecations (returns only the extra deprecations)
+ deprecs <- rnSrcDeprecDecls deprec_decls ;
+ updGblEnv (\gbl -> gbl { tcg_deprecs = tcg_deprecs gbl `plusDeprecs` deprecs })
+ $ do {
+
+ -- Deal with top-level fixity decls
+ -- (returns the total new fixity env)
+ fix_env <- rnSrcFixityDecls fix_decls ;
+ updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env })
+ $ do {
+
+ -- Rename other declarations
+ traceRn (text "Start rnmono") ;
+ (rn_val_decls, bind_dus) <- rnTopBinds binds sigs ;
+ traceRn (text "finish rnmono" <+> ppr rn_val_decls) ;
+
+ -- You might think that we could build proper def/use information
+ -- for type and class declarations, but they can be involved
+ -- in mutual recursion across modules, and we only do the SCC
+ -- analysis for them in the type checker.
+ -- So we content ourselves with gathering uses only; that
+ -- means we'll only report a declaration as unused if it isn't
+ -- mentioned at all. Ah well.
+ (rn_tycl_decls, src_fvs1)
+ <- mapFvRn (wrapLocFstM rnTyClDecl) tycl_decls ;
+ (rn_inst_decls, src_fvs2)
+ <- mapFvRn (wrapLocFstM rnSrcInstDecl) inst_decls ;
+ (rn_rule_decls, src_fvs3)
+ <- mapFvRn (wrapLocFstM rnHsRuleDecl) rule_decls ;
+ (rn_foreign_decls, src_fvs4)
+ <- mapFvRn (wrapLocFstM rnHsForeignDecl) foreign_decls ;
+ (rn_default_decls, src_fvs5)
+ <- mapFvRn (wrapLocFstM rnDefaultDecl) default_decls ;
+
+ let {
+ rn_group = HsGroup { hs_valds = rn_val_decls,
+ hs_tyclds = rn_tycl_decls,
+ hs_instds = rn_inst_decls,
+ hs_fixds = [],
+ hs_depds = [],
+ hs_fords = rn_foreign_decls,
+ hs_defds = rn_default_decls,
+ hs_ruleds = rn_rule_decls } ;
+
+ other_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3,
+ src_fvs4, src_fvs5] ;
+ src_dus = bind_dus `plusDU` usesOnly other_fvs
+ -- Note: src_dus will contain *uses* for locally-defined types
+ -- and classes, but no *defs* for them. (Because rnTyClDecl
+ -- returns only the uses.) This is a little
+ -- surprising but it doesn't actually matter at all.
+ } ;
+
+ traceRn (text "finish rnSrc" <+> ppr rn_group) ;
+ traceRn (text "finish Dus" <+> ppr src_dus ) ;
+ tcg_env <- getGblEnv ;
+ return (tcg_env `addTcgDUs` src_dus, rn_group)
+ }}}
+
+rnTyClDecls :: [LTyClDecl RdrName] -> RnM [LTyClDecl Name]
+rnTyClDecls tycl_decls = do
+ (decls', fvs) <- mapFvRn (wrapLocFstM rnTyClDecl) tycl_decls
+ return decls'
+
+addTcgDUs :: TcGblEnv -> DefUses -> TcGblEnv
+addTcgDUs tcg_env dus = tcg_env { tcg_dus = tcg_dus tcg_env `plusDU` dus }
+\end{code}
+
+
%*********************************************************
-%* *
-\subsection{Value declarations}
-%* *
+%* *
+ Source-code fixity declarations
+%* *
%*********************************************************
\begin{code}
-rnDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl
-
-rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ new_binds ->
- returnRn (ValD new_binds)
-
-
-rnDecl (SigD (IfaceSig name ty id_infos loc))
- = pushSrcLocRn loc $
- lookupBndrRn name `thenRn` \ name' ->
- rnHsType ty `thenRn` \ ty' ->
- -- Get the pragma info (if any).
- setModeRn (InterfaceMode Optional) $
- -- In all the rest of the signature we read in optional mode,
- -- so that (a) we don't die
- mapRn rnIdInfo id_infos `thenRn` \ id_infos' ->
- returnRn (SigD (IfaceSig name' ty' id_infos' loc))
+rnSrcFixityDecls :: [LFixitySig RdrName] -> RnM FixityEnv
+rnSrcFixityDecls fix_decls
+ = getGblEnv `thenM` \ gbl_env ->
+ foldlM rnFixityDecl (tcg_fix_env gbl_env)
+ fix_decls `thenM` \ fix_env ->
+ traceRn (text "fixity env" <+> pprFixEnv fix_env) `thenM_`
+ returnM fix_env
+
+rnFixityDecl :: FixityEnv -> LFixitySig RdrName -> RnM FixityEnv
+rnFixityDecl fix_env (L loc (FixitySig rdr_name fixity))
+ = setSrcSpan loc $
+ -- GHC extension: look up both the tycon and data con
+ -- for con-like things
+ -- If neither are in scope, report an error; otherwise
+ -- add both to the fixity env
+ addLocM lookupTopFixSigNames rdr_name `thenM` \ names ->
+ if null names then
+ addLocErr rdr_name unknownNameErr `thenM_`
+ returnM fix_env
+ else
+ foldlM add fix_env names
+ where
+ add fix_env name
+ = case lookupNameEnv fix_env name of
+ Just (FixItem _ _ loc')
+ -> addLocErr rdr_name (dupFixityDecl loc') `thenM_`
+ returnM fix_env
+ Nothing -> returnM (extendNameEnv fix_env name fix_item)
+ where
+ fix_item = FixItem (nameOccName name) fixity (getLoc rdr_name)
+
+pprFixEnv :: FixityEnv -> SDoc
+pprFixEnv env
+ = pprWithCommas (\ (FixItem n f _) -> ppr f <+> ppr n)
+ (nameEnvElts env)
+
+dupFixityDecl loc rdr_name
+ = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
+ ptext SLIT("also at ") <+> ppr loc
+ ]
\end{code}
+
%*********************************************************
-%* *
-\subsection{Type declarations}
-%* *
+%* *
+ Source-code deprecations 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.
+For deprecations, all we do is check that the names are in scope.
+It's only imported deprecations, dealt with in RnIfaces, that we
+gather them together.
\begin{code}
-rnDecl (TyD (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc))
- = pushSrcLocRn src_loc $
- lookupBndrRn tycon `thenRn` \ tycon' ->
- bindTyVarsRn data_doc tyvars $ \ tyvars' ->
- rnContext context `thenRn` \ context' ->
- checkDupOrQualNames data_doc con_names `thenRn_`
- mapRn rnConDecl condecls `thenRn` \ condecls' ->
- rnDerivs derivings `thenRn` \ derivings' ->
- ASSERT(isNoDataPragmas pragmas)
- returnRn (TyD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc))
- where
- data_doc sty = text "the data type declaration for" <+> ppr sty tycon
- con_names = map conDeclName condecls
+rnSrcDeprecDecls :: [LDeprecDecl RdrName] -> RnM Deprecations
+rnSrcDeprecDecls []
+ = returnM NoDeprecs
+
+rnSrcDeprecDecls decls
+ = mappM (addLocM rn_deprec) decls `thenM` \ pairs ->
+ returnM (DeprecSome (mkNameEnv (catMaybes pairs)))
+ where
+ rn_deprec (Deprecation rdr_name txt)
+ = lookupTopBndrRn rdr_name `thenM` \ name ->
+ returnM (Just (name, (rdrNameOcc rdr_name, txt)))
+
+checkModDeprec :: Maybe DeprecTxt -> Deprecations
+-- Check for a module deprecation; done once at top level
+checkModDeprec Nothing = NoDeprecs
+checkModDeprec (Just txt) = DeprecAll txt
+\end{code}
-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))
+%*********************************************************
+%* *
+\subsection{Source code declarations}
+%* *
+%*********************************************************
+
+\begin{code}
+rnDefaultDecl (DefaultDecl tys)
+ = mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) ->
+ returnM (DefaultDecl tys', fvs)
where
- syn_doc sty = text "the declaration for type synonym" <+> ppr sty name
+ doc_str = text "In a `default' declaration"
\end{code}
%*********************************************************
%* *
-\subsection{Class declarations}
+ Bindings
%* *
%*********************************************************
-@rnClassDecl@ uses the `global name function' to create a new
-class declaration in which local names have been replaced by their
-original names, reporting any unknown names.
+These chaps are here, rather than in TcBinds, so that there
+is just one hi-boot file (for RnSource). rnSrcDecls is part
+of the loop too, and it must be defined in this module.
\begin{code}
-rnDecl (ClD (ClassDecl context cname tyvar sigs mbinds pragmas src_loc))
- = pushSrcLocRn src_loc $
-
- bindTyVarsRn cls_doc [tyvar] ( \ [tyvar'] ->
- rnContext context `thenRn` \ context' ->
- lookupBndrRn cname `thenRn` \ cname' ->
-
- -- Check the signatures
- checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
- mapRn (rn_op cname' (getTyVarName tyvar')) sigs `thenRn` \ sigs' ->
- returnRn (tyvar', context', cname', sigs')
- ) `thenRn` \ (tyvar', context', cname', sigs') ->
+rnBindGroups :: [HsBindGroup RdrName] -> RnM ([HsBindGroup Name], DefUses)
+-- This version assumes that the binders are already in scope
+-- It's used only in 'mdo'
+rnBindGroups []
+ = returnM ([], emptyDUs)
+rnBindGroups [HsBindGroup bind sigs _]
+ = rnBinds NotTopLevel bind sigs
+rnBindGroups b@[HsIPBinds bind]
+ = do addErr (badIpBinds b)
+ returnM ([], emptyDUs)
+rnBindGroups _
+ = panic "rnBindGroups"
+
+rnBindGroupsAndThen
+ :: [HsBindGroup RdrName]
+ -> ([HsBindGroup Name] -> RnM (result, FreeVars))
+ -> RnM (result, FreeVars)
+-- This version (a) assumes that the binding vars are not already in scope
+-- (b) removes the binders from the free vars of the thing inside
+-- The parser doesn't produce ThenBinds
+rnBindGroupsAndThen [] thing_inside
+ = thing_inside []
+rnBindGroupsAndThen [HsBindGroup bind sigs _] thing_inside
+ = rnBindsAndThen bind sigs $ \ groups -> thing_inside groups
+rnBindGroupsAndThen [HsIPBinds binds] thing_inside
+ = rnIPBinds binds `thenM` \ (binds',fv_binds) ->
+ thing_inside [HsIPBinds binds'] `thenM` \ (thing, fvs_thing) ->
+ returnM (thing, fvs_thing `plusFV` fv_binds)
+
+rnIPBinds [] = returnM ([], emptyFVs)
+rnIPBinds (bind : binds)
+ = wrapLocFstM rnIPBind bind `thenM` \ (bind', fvBind) ->
+ rnIPBinds binds `thenM` \ (binds',fvBinds) ->
+ returnM (bind' : binds', fvBind `plusFV` fvBinds)
+
+rnIPBind (IPBind n expr)
+ = newIPNameRn n `thenM` \ name ->
+ rnLExpr expr `thenM` \ (expr',fvExpr) ->
+ return (IPBind name expr', fvExpr)
+
+badIpBinds binds
+ = hang (ptext SLIT("Implicit-parameter bindings illegal in 'mdo':")) 4
+ (ppr binds)
+\end{code}
- -- Check the methods
- checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
- -- 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.
+%*********************************************************
+%* *
+\subsection{Foreign declarations}
+%* *
+%*********************************************************
- ASSERT(isNoClassPragmas pragmas)
- returnRn (ClD (ClassDecl context' cname' tyvar' sigs' mbinds' NoClassPragmas src_loc))
- 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
-
- sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
- meth_rdr_names_w_locs = bagToList (collectMonoBinders mbinds)
- meth_rdr_names = map fst meth_rdr_names_w_locs
-
- rn_op clas clas_tyvar sig@(ClassOpSig op maybe_dm ty locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- rnHsSigType (\sty -> ppr sty op) ty `thenRn` \ new_ty ->
-
- -- Make the default-method name
- let
- dm_occ = prefixOccName SLIT("$m") (rdrNameOcc op)
- in
- getModuleRn `thenRn` \ mod_name ->
- getModeRn `thenRn` \ mode ->
- (case (mode, maybe_dm) of
- (SourceMode, _) | op `elem` meth_rdr_names
- -> -- There's an explicit method decl
- newLocallyDefinedGlobalName mod_name dm_occ
- (\_ -> Exported) locn `thenRn` \ dm_name ->
- returnRn (Just dm_name)
-
- (InterfaceMode _, Just _)
- -> -- Imported class that has a default method decl
- newGlobalName mod_name dm_occ (ifaceFlavour clas) `thenRn` \ dm_name ->
- addOccurrenceName dm_name `thenRn_`
- returnRn (Just dm_name)
-
- other -> returnRn Nothing
- ) `thenRn` \ maybe_dm_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_`
-
- returnRn (ClassOpSig op_name maybe_dm_name new_ty locn)
+\begin{code}
+rnHsForeignDecl (ForeignImport name ty spec isDeprec)
+ = lookupLocatedTopBndrRn name `thenM` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
+ returnM (ForeignImport name' ty' spec isDeprec, fvs)
+
+rnHsForeignDecl (ForeignExport name ty spec isDeprec)
+ = lookupLocatedOccRn name `thenM` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
+ returnM (ForeignExport name' ty' spec isDeprec, fvs )
+ -- NB: a foreign export is an *occurrence site* for name, so
+ -- we add it to the free-variable list. It might, for example,
+ -- be imported from another module
+
+fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name
\end{code}
%*********************************************************
\begin{code}
-rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun src_loc))
- = pushSrcLocRn src_loc $
- rnHsSigType (\sty -> text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
-
+rnSrcInstDecl (InstDecl inst_ty mbinds uprags)
+ -- Used for both source and interface file decls
+ = rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' ->
-- Rename the bindings
- -- NB meth_names can be qualified!
- checkDupNames meth_doc meth_names `thenRn_`
- rnMethodBinds mbinds `thenRn` \ mbinds' ->
- mapRn rn_uprag uprags `thenRn` \ new_uprags ->
-
- newDfunName maybe_dfun src_loc `thenRn` \ dfun_name ->
- addOccurrenceName dfun_name `thenRn_`
- -- The dfun is not optional, because we use its version number
- -- to identify the version of the instance declaration
-
- -- The typechecker checks that all the bindings are for the right class.
- returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags (Just dfun_name) src_loc))
- where
- meth_doc sty = text "the bindings in an instance declaration"
- meth_names = bagToList (collectMonoBinders mbinds)
-
- rn_uprag (SpecSig op ty using locn)
- = pushSrcLocRn src_loc $
- lookupBndrRn op `thenRn` \ op_name ->
- rnHsSigType (\sty -> ppr sty op) ty `thenRn` \ new_ty ->
- rn_using using `thenRn` \ new_using ->
- returnRn (SpecSig op_name new_ty new_using locn)
-
- rn_uprag (InlineSig op locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (InlineSig op_name locn)
-
- rn_uprag (MagicUnfoldingSig op str locn)
- = pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
- returnRn (MagicUnfoldingSig op_name str locn)
-
- rn_using Nothing = returnRn Nothing
- rn_using (Just v) = lookupOccRn v `thenRn` \ new_v ->
- returnRn (Just new_v)
+ -- The typechecker (not the renamer) checks that all
+ -- the bindings are for the right class
+ let
+ meth_doc = text "In the bindings in an instance declaration"
+ meth_names = collectHsBindLocatedBinders mbinds
+ (inst_tyvars, _, cls,_) = splitHsInstDeclTy (unLoc inst_ty')
+ in
+ checkDupNames meth_doc meth_names `thenM_`
+ extendTyVarEnvForMethodBinds inst_tyvars (
+ -- (Slightly strangely) the forall-d tyvars scope over
+ -- the method bindings too
+ rnMethodBinds cls [] mbinds
+ ) `thenM` \ (mbinds', meth_fvs) ->
+ -- 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
+ let
+ binders = collectHsBindBinders mbinds'
+ in
+ bindLocalNames binders (renameSigs uprags) `thenM` \ uprags' ->
+ checkSigs (okInstDclSig (mkNameSet binders)) uprags' `thenM_`
+
+ returnM (InstDecl inst_ty' mbinds' uprags',
+ meth_fvs `plusFV` hsSigsFVs uprags'
+ `plusFV` extractHsTyNames inst_ty')
\end{code}
-%*********************************************************
-%* *
-\subsection{Default declarations}
-%* *
-%*********************************************************
+For the method bindings in class and instance decls, we extend the
+type variable environment iff -fglasgow-exts
\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))
+extendTyVarEnvForMethodBinds tyvars thing_inside
+ = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts ->
+ if opt_GlasgowExts then
+ extendTyVarEnvFVRn (map hsLTyVarName tyvars) thing_inside
+ else
+ thing_inside
\end{code}
+
%*********************************************************
%* *
-\subsection{Support code for type/data declarations}
+\subsection{Rules}
%* *
%*********************************************************
\begin{code}
-rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name])
+rnHsRuleDecl (HsRule rule_name act vars lhs rhs)
+ = bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $
-rnDerivs Nothing -- derivs not specified
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- returnRn Nothing
+ bindLocatedLocalsFV doc (map get_var vars) $ \ ids ->
+ mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) ->
-rnDerivs (Just ds)
- = lookupImplicitOccRn evalClass_RDR `thenRn_`
- mapRn rn_deriv ds `thenRn` \ derivs ->
- returnRn (Just derivs)
+ rnLExpr lhs `thenM` \ (lhs', fv_lhs) ->
+ rnLExpr rhs `thenM` \ (rhs', fv_rhs) ->
+ let
+ mb_bad = validRuleLhs ids lhs'
+ in
+ checkErr (isNothing mb_bad)
+ (badRuleLhsErr rule_name lhs' mb_bad) `thenM_`
+ let
+ bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
+ in
+ mappM (addErr . badRuleVar rule_name) bad_vars `thenM_`
+ returnM (HsRule rule_name act vars' lhs' rhs',
+ fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
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
+ doc = text "In the transformation rule" <+> ftext rule_name
+
+ get_var (RuleBndr v) = v
+ get_var (RuleBndrSig v _) = v
+
+ rn_var (RuleBndr (L loc v), id)
+ = returnM (RuleBndr (L loc id), emptyFVs)
+ rn_var (RuleBndrSig (L loc v) t, id)
+ = rnHsTypeFVs doc t `thenM` \ (t', fvs) ->
+ returnM (RuleBndrSig (L loc id) t', fvs)
\end{code}
+Check the shape of a transformation rule LHS. Currently
+we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
+not one of the @forall@'d variables. We also restrict the form of the LHS so
+that it may be plausibly matched. Basically you only get to write ordinary
+applications. (E.g. a case expression is not allowed: too elaborate.)
+
+NB: if you add new cases here, make sure you add new ones to TcRule.ruleLhsTvs
+
\begin{code}
-conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
-conDeclName (ConDecl n _ _ l) = (n,l)
-
-rnConDecl :: RdrNameConDecl -> RnMS s RenamedConDecl
-rnConDecl (ConDecl name cxt details locn)
- = pushSrcLocRn locn $
- checkConName name `thenRn_`
- lookupBndrRn name `thenRn` \ new_name ->
- rnConDetails name locn details `thenRn` \ new_details ->
- rnContext cxt `thenRn` \ new_context ->
- returnRn (ConDecl new_name new_context new_details locn)
-
-rnConDetails con locn (VanillaCon tys)
- = mapRn rnBangTy tys `thenRn` \ new_tys ->
- returnRn (VanillaCon new_tys)
-
-rnConDetails con locn (InfixCon ty1 ty2)
- = rnBangTy ty1 `thenRn` \ new_ty1 ->
- rnBangTy ty2 `thenRn` \ new_ty2 ->
- returnRn (InfixCon new_ty1 new_ty2)
-
-rnConDetails con locn (NewCon ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (NewCon new_ty)
-
-rnConDetails con locn (RecCon fields)
- = checkDupOrQualNames fld_doc field_names `thenRn_`
- mapRn rnField fields `thenRn` \ new_fields ->
- returnRn (RecCon new_fields)
+validRuleLhs :: [Name] -> LHsExpr Name -> Maybe (HsExpr Name)
+-- Nothing => OK
+-- Just e => Not ok, and e is the offending expression
+validRuleLhs foralls lhs
+ = checkl lhs
where
- fld_doc sty = text "the fields of constructor" <> ppr sty con
- field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
+ checkl (L loc e) = check e
-rnField (names, ty)
- = mapRn lookupBndrRn names `thenRn` \ new_names ->
- rnBangTy ty `thenRn` \ new_ty ->
- returnRn (new_names, new_ty)
+ check (OpApp e1 op _ e2) = checkl op `seqMaybe` checkl_e e1 `seqMaybe` checkl_e e2
+ check (HsApp e1 e2) = checkl e1 `seqMaybe` checkl_e e2
+ check (HsVar v) | v `notElem` foralls = Nothing
+ check other = Just other -- Failure
-rnBangTy (Banged ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (Banged new_ty)
+ checkl_e (L loc e) = check_e e
-rnBangTy (Unbanged ty)
- = rnHsType ty `thenRn` \ new_ty ->
- returnRn (Unbanged new_ty)
+ check_e (HsVar v) = Nothing
+ check_e (HsPar e) = checkl_e e
+ check_e (HsLit e) = Nothing
+ check_e (HsOverLit e) = Nothing
--- 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
+ check_e (OpApp e1 op _ e2) = checkl_e e1 `seqMaybe` checkl_e op `seqMaybe` checkl_e e2
+ check_e (HsApp e1 e2) = checkl_e e1 `seqMaybe` checkl_e e2
+ check_e (NegApp e _) = checkl_e e
+ check_e (ExplicitList _ es) = checkl_es es
+ check_e (ExplicitTuple es _) = checkl_es es
+ check_e other = Just other -- Fails
+
+ checkl_es es = foldr (seqMaybe . checkl_e) Nothing es
-checkConName name
- = checkRn (isLexCon (occNameString (rdrNameOcc name)))
- (badDataCon name)
+badRuleLhsErr name lhs (Just bad_e)
+ = sep [ptext SLIT("Rule") <+> ftext name <> colon,
+ nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e,
+ ptext SLIT("in left-hand side:") <+> ppr lhs])]
+ $$
+ ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
+
+badRuleVar name var
+ = sep [ptext SLIT("Rule") <+> doubleQuotes (ftext name) <> colon,
+ ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
+ ptext SLIT("does not appear on left hand side")]
\end{code}
%*********************************************************
%* *
-\subsection{Support code to rename types}
+\subsection{Type, class and iface sig declarations}
%* *
%*********************************************************
-\begin{code}
-rnHsSigType :: (PprStyle -> Doc) -> RdrNameHsType -> RnMS s RenamedHsType
- -- rnHsSigType is used for source-language type signatures,
- -- which use *implicit* universal quantification.
-
--- Given the signature C => T we universally quantify over FV(T) \ {in-scope-tyvars}
---
--- We insist that the universally quantified type vars is a superset of FV(C)
--- It follows that FV(T) is a superset of FV(C), so that the context constrains
--- no type variables that don't appear free in the tau-type part.
-
-rnHsSigType doc_str full_ty@(HsPreForAllTy ctxt ty) -- From source code (no kinds on tyvars)
- = getNameEnv `thenRn` \ name_env ->
- let
- mentioned_tyvars = extractHsTyVars ty
- forall_tyvars = filter (not . in_scope) mentioned_tyvars
- in_scope tv = maybeToBool (lookupFM name_env tv)
-
- constrained_tyvars = nub (concat (map (extractHsTyVars . snd) ctxt))
- constrained_and_in_scope = filter in_scope constrained_tyvars
- constrained_and_not_mentioned = filter (not . (`elem` mentioned_tyvars)) constrained_tyvars
-
- -- Zap the context if there's a problem, to avoid duplicate error message.
- ctxt' | null constrained_and_in_scope && null constrained_and_not_mentioned = ctxt
- | otherwise = []
- in
- checkRn (null constrained_and_in_scope)
- (ctxtErr1 sig_doc constrained_and_in_scope) `thenRn_`
- checkRn (null constrained_and_not_mentioned)
- (ctxtErr2 sig_doc constrained_and_not_mentioned ty) `thenRn_`
-
- (bindTyVarsRn sig_doc (map UserTyVar forall_tyvars) $ \ new_tyvars ->
- rnContext ctxt' `thenRn` \ new_ctxt ->
- rnHsType ty `thenRn` \ new_ty ->
- returnRn (HsForAllTy new_tyvars new_ctxt new_ty)
- )
- where
- sig_doc sty = text "the type signature for" <+> doc_str sty
-
+@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.
-rnHsSigType doc_str other_ty = rnHsType other_ty
+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.
-rnHsType :: RdrNameHsType -> RnMS s RenamedHsType
-rnHsType (HsForAllTy tvs ctxt ty) -- From an interface file (tyvars may be kinded)
- = rn_poly_help tvs ctxt ty
+\begin{code}
+rnTyClDecl (ForeignType {tcdLName = name, tcdFoType = fo_type, tcdExtName = ext_name})
+ = lookupLocatedTopBndrRn name `thenM` \ name' ->
+ returnM (ForeignType {tcdLName = name', tcdFoType = fo_type, tcdExtName = ext_name},
+ emptyFVs)
+
+rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdLName = tycon,
+ tcdTyVars = tyvars, tcdCons = condecls,
+ tcdKindSig = sig, tcdDerivs = derivs})
+ | is_vanilla -- Normal Haskell data type decl
+ = ASSERT( isNothing sig ) -- In normal H98 form, kind signature on the
+ -- data type is syntactically illegal
+ bindTyVarsRn data_doc tyvars $ \ tyvars' ->
+ do { tycon' <- lookupLocatedTopBndrRn tycon
+ ; context' <- rnContext data_doc context
+ ; (derivs', deriv_fvs) <- rn_derivs derivs
+ ; checkDupNames data_doc con_names
+ ; condecls' <- rnConDecls (unLoc tycon') condecls
+ ; returnM (TyData {tcdND = new_or_data, tcdCtxt = context', tcdLName = tycon',
+ tcdTyVars = tyvars', tcdKindSig = Nothing, tcdCons = condecls',
+ tcdDerivs = derivs'},
+ delFVs (map hsLTyVarName tyvars') $
+ extractHsCtxtTyNames context' `plusFV`
+ plusFVs (map conDeclFVs condecls') `plusFV`
+ deriv_fvs) }
+
+ | otherwise -- GADT
+ = ASSERT( null (unLoc context) )
+ do { tycon' <- lookupLocatedTopBndrRn tycon
+ ; tyvars' <- bindTyVarsRn data_doc tyvars
+ (\ tyvars' -> return tyvars')
+ -- For GADTs, the type variables in the declaration
+ -- do not scope over the constructor signatures
+ -- data T a where { T1 :: forall b. b-> b }
+ ; (derivs', deriv_fvs) <- rn_derivs derivs
+ ; checkDupNames data_doc con_names
+ ; condecls' <- rnConDecls (unLoc tycon') condecls
+ ; returnM (TyData {tcdND = new_or_data, tcdCtxt = noLoc [], tcdLName = tycon',
+ tcdTyVars = tyvars', tcdCons = condecls', tcdKindSig = sig,
+ tcdDerivs = derivs'},
+ plusFVs (map conDeclFVs condecls') `plusFV` deriv_fvs) }
-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)
- in
- rn_poly_help (map UserTyVar forall_tyvars) ctxt ty
-
-rnHsType (MonoTyVar tyvar)
- = lookupOccRn tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar')
-
-rnHsType (MonoFunTy ty1 ty2)
- = andRn MonoFunTy (rnHsType ty1) (rnHsType ty2)
-
-rnHsType (MonoListTy _ ty)
- = lookupImplicitOccRn listType_RDR `thenRn` \ tycon_name ->
- rnHsType ty `thenRn` \ ty' ->
- returnRn (MonoListTy tycon_name ty')
-
-rnHsType (MonoTupleTy _ tys)
- = lookupImplicitOccRn (tupleType_RDR (length tys)) `thenRn` \ tycon_name ->
- mapRn rnHsType tys `thenRn` \ tys' ->
- returnRn (MonoTupleTy tycon_name tys')
-
-rnHsType (MonoTyApp ty1 ty2)
- = rnHsType ty1 `thenRn` \ ty1' ->
- rnHsType ty2 `thenRn` \ ty2' ->
- returnRn (MonoTyApp ty1' ty2')
-
-rnHsType (MonoDictTy clas 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)
where
- sig_doc sty = text "a nested for-all type"
-\end{code}
+ is_vanilla = case condecls of -- Yuk
+ [] -> True
+ L _ (ConDecl {}) : _ -> True
+ other -> False
+ data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
+ con_names = map con_names_helper condecls
-\begin{code}
-rnContext :: RdrNameContext -> RnMS s RenamedContext
+ con_names_helper (L _ (ConDecl n _ _ _)) = n
+ con_names_helper (L _ (GadtDecl n _)) = n
-rnContext ctxt
- = mapRn rn_ctxt ctxt `thenRn` \ result ->
+ rn_derivs Nothing = returnM (Nothing, emptyFVs)
+ rn_derivs (Just ds) = rnLHsTypes data_doc ds `thenM` \ ds' ->
+ returnM (Just ds', extractHsTyNames_s ds')
+
+rnTyClDecl (TySynonym {tcdLName = name, tcdTyVars = tyvars, tcdSynRhs = ty})
+ = lookupLocatedTopBndrRn name `thenM` \ name' ->
+ bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
+ rnHsTypeFVs syn_doc ty `thenM` \ (ty', fvs) ->
+ returnM (TySynonym {tcdLName = name', tcdTyVars = tyvars',
+ tcdSynRhs = ty'},
+ delFVs (map hsLTyVarName tyvars') fvs)
+ where
+ syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name)
+
+rnTyClDecl (ClassDecl {tcdCtxt = context, tcdLName = cname,
+ tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
+ tcdMeths = mbinds})
+ = lookupLocatedTopBndrRn cname `thenM` \ cname' ->
+
+ -- Tyvars scope over superclass context and method signatures
+ bindTyVarsRn cls_doc tyvars ( \ tyvars' ->
+ rnContext cls_doc context `thenM` \ context' ->
+ rnFds cls_doc fds `thenM` \ fds' ->
+ renameSigs sigs `thenM` \ sigs' ->
+ returnM (tyvars', context', fds', sigs')
+ ) `thenM` \ (tyvars', context', fds', sigs') ->
+
+ -- Check the signatures
+ -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
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)]
+ sig_rdr_names_w_locs = [op | L _ (Sig op _) <- sigs]
in
+ checkDupNames sig_doc sig_rdr_names_w_locs `thenM_`
+ checkSigs okClsDclSig sigs' `thenM_`
+ -- Typechecker is responsible for checking that we only
+ -- give default-method bindings for things in this class.
+ -- The renamer *could* check this for class decls, but can't
+ -- for instance decls.
- -- 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
+ -- 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.
+ extendTyVarEnvForMethodBinds tyvars' (
+ getLocalRdrEnv `thenM` \ name_env ->
+ let
+ meth_rdr_names_w_locs = collectHsBindLocatedBinders mbinds
+ gen_rdr_tyvars_w_locs =
+ [ tv | tv <- extractGenericPatTyVars mbinds,
+ not (unLoc tv `elemLocalRdrEnv` name_env) ]
+ in
+ checkDupNames meth_doc meth_rdr_names_w_locs `thenM_`
+ newLocalsRn gen_rdr_tyvars_w_locs `thenM` \ gen_tyvars ->
+ rnMethodBinds (unLoc cname') gen_tyvars mbinds
+ ) `thenM` \ (mbinds', meth_fvs) ->
+
+ returnM (ClassDecl { tcdCtxt = context', tcdLName = cname', tcdTyVars = tyvars',
+ tcdFDs = fds', tcdSigs = sigs', tcdMeths = mbinds'},
+ delFVs (map hsLTyVarName tyvars') $
+ extractHsCtxtTyNames context' `plusFV`
+ plusFVs (map extractFunDepNames (map unLoc fds')) `plusFV`
+ hsSigsFVs sigs' `plusFV`
+ meth_fvs)
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 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
+ meth_doc = text "In the default-methods for class" <+> ppr cname
+ cls_doc = text "In the declaration for class" <+> ppr cname
+ sig_doc = text "In the signatures for class" <+> ppr cname
\end{code}
-
%*********************************************************
%* *
-\subsection{IdInfo}
+\subsection{Support code for type/data declarations}
%* *
%*********************************************************
\begin{code}
-rnIdInfo (HsStrictness strict)
- = rnStrict strict `thenRn` \ strict' ->
- returnRn (HsStrictness strict')
-
-rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (HsUnfold inline expr')
-rnIdInfo (HsArity arity) = returnRn (HsArity arity)
-rnIdInfo (HsUpdate update) = returnRn (HsUpdate update)
-rnIdInfo (HsFBType fb) = returnRn (HsFBType fb)
-rnIdInfo (HsArgUsage au) = returnRn (HsArgUsage au)
-
-rnStrict (HsStrictnessInfo demands (Just (worker,cons)))
- -- The sole purpose of the "cons" field is so that we can mark the constructors
- -- needed to build the wrapper as "needed", so that their data type decl will be
- -- slurped in. After that their usefulness is o'er, so we just put in the empty list.
- = lookupOccRn worker `thenRn` \ worker' ->
- mapRn lookupOccRn cons `thenRn_`
- returnRn (HsStrictnessInfo demands (Just (worker',[])))
-
--- Boring, but necessary for the type checker.
-rnStrict (HsStrictnessInfo demands Nothing) = returnRn (HsStrictnessInfo demands Nothing)
-rnStrict HsBottom = returnRn HsBottom
-\end{code}
-
-UfCore expressions.
-
-\begin{code}
-rnCoreExpr (UfVar v)
- = lookupOccRn v `thenRn` \ v' ->
- returnRn (UfVar v')
-
-rnCoreExpr (UfLit lit) = returnRn (UfLit lit)
-
-rnCoreExpr (UfCon con args)
- = lookupOccRn con `thenRn` \ con' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfCon con' args')
-
-rnCoreExpr (UfPrim prim args)
- = rnCorePrim prim `thenRn` \ prim' ->
- mapRn rnCoreArg args `thenRn` \ args' ->
- returnRn (UfPrim prim' args')
-
-rnCoreExpr (UfApp fun arg)
- = rnCoreExpr fun `thenRn` \ fun' ->
- rnCoreArg arg `thenRn` \ arg' ->
- returnRn (UfApp fun' arg')
-
-rnCoreExpr (UfCase scrut alts)
- = rnCoreExpr scrut `thenRn` \ scrut' ->
- rnCoreAlts alts `thenRn` \ alts' ->
- returnRn (UfCase scrut' alts')
-
-rnCoreExpr (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 (UfLam bndr body)
- = rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLam bndr' body')
-
-rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
- = rnCoreExpr rhs `thenRn` \ rhs' ->
- rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfNonRec bndr' rhs') body')
-
-rnCoreExpr (UfLet (UfRec pairs) body)
- = rnCoreBndrs bndrs $ \ bndrs' ->
- mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
+rnConDecls :: Name -> [LConDecl RdrName] -> RnM [LConDecl Name]
+rnConDecls tycon condecls
+ = -- Check that there's at least one condecl,
+ -- or else we're reading an interface file, or -fglasgow-exts
+ (if null condecls then
+ doptM Opt_GlasgowExts `thenM` \ glaExts ->
+ checkErr glaExts (emptyConDeclsErr tycon)
+ else returnM ()
+ ) `thenM_`
+ mappM (wrapLocM rnConDecl) condecls
+
+rnConDecl :: ConDecl RdrName -> RnM (ConDecl Name)
+rnConDecl (ConDecl name tvs cxt details)
+ = addLocM checkConName name `thenM_`
+ lookupLocatedTopBndrRn name `thenM` \ new_name ->
+
+ bindTyVarsRn doc tvs $ \ new_tyvars ->
+ rnContext doc cxt `thenM` \ new_context ->
+ rnConDetails doc details `thenM` \ new_details ->
+ returnM (ConDecl new_name new_tyvars new_context new_details)
where
- (bndrs, rhss) = unzip pairs
-\end{code}
+ doc = text "In the definition of data constructor" <+> quotes (ppr name)
-\begin{code}
-rnCoreBndr (UfValBinder name ty) thing_inside
- = rnHsType ty `thenRn` \ ty' ->
- bindLocalsRn "unfolding value" [name] $ \ [name'] ->
- thing_inside (UfValBinder name' ty')
-
-rnCoreBndr (UfTyBinder name kind) thing_inside
- = bindLocalsRn "unfolding tyvar" [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')
+rnConDecl (GadtDecl name ty)
+ = addLocM checkConName name `thenM_`
+ lookupLocatedTopBndrRn name `thenM` \ new_name ->
+ rnHsSigType doc ty `thenM` \ new_ty ->
+ returnM (GadtDecl new_name new_ty)
where
- names = map (\ (UfValBinder name _) -> name) bndrs
- tys = map (\ (UfValBinder _ ty) -> ty) bndrs
+ doc = text "In the definition of data constructor" <+> quotes (ppr name)
-rnCoreBndrNamess names thing_inside
- = bindLocalsRn "unfolding value" names $ \ names' ->
- thing_inside names'
-\end{code}
+rnConDetails doc (PrefixCon tys)
+ = mappM (rnLHsType doc) tys `thenM` \ new_tys ->
+ returnM (PrefixCon new_tys)
-\begin{code}
-rnCoreArg (UfVarArg v) = lookupOccRn v `thenRn` \ v' -> returnRn (UfVarArg v')
-rnCoreArg (UfUsageArg u) = lookupOccRn 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) = lookupOccRn con `thenRn` \ con' ->
- bindLocalsRn "unfolding alt" bndrs $ \ bndrs' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (con', bndrs', rhs')
-
-rnCoreAlts (UfPrimAlts alts deflt)
- = mapRn rn_alt alts `thenRn` \ alts' ->
- rnCoreDefault deflt `thenRn` \ deflt' ->
- returnRn (UfPrimAlts alts' deflt')
+rnConDetails doc (InfixCon ty1 ty2)
+ = rnLHsType doc ty1 `thenM` \ new_ty1 ->
+ rnLHsType doc ty2 `thenM` \ new_ty2 ->
+ returnM (InfixCon new_ty1 new_ty2)
+
+rnConDetails doc (RecCon fields)
+ = checkDupNames doc field_names `thenM_`
+ mappM (rnField doc) fields `thenM` \ new_fields ->
+ returnM (RecCon new_fields)
where
- rn_alt (lit, rhs) = rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (lit, rhs')
+ field_names = [fld | (fld, _) <- fields]
-rnCoreDefault UfNoDefault = returnRn UfNoDefault
-rnCoreDefault (UfBindDefault bndr rhs) = bindLocalsRn "unfolding default" [bndr] $ \ [bndr'] ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (UfBindDefault bndr' rhs')
+rnField doc (name, ty)
+ = lookupLocatedTopBndrRn name `thenM` \ new_name ->
+ rnLHsType doc ty `thenM` \ new_ty ->
+ returnM (new_name, 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
-rnCoercion (UfIn n) = lookupOccRn n `thenRn` \ n' -> returnRn (UfIn n')
-rnCoercion (UfOut n) = lookupOccRn n `thenRn` \ n' -> returnRn (UfOut n')
+checkConName name = checkErr (isRdrDataCon name) (badDataCon name)
-rnCorePrim (UfOtherOp op)
- = lookupOccRn op `thenRn` \ op' ->
- returnRn (UfOtherOp op')
+badDataCon name
+ = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
-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')
+emptyConDeclsErr tycon
+ = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"),
+ nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))]
\end{code}
+
%*********************************************************
%* *
-\subsection{Errors}
+\subsection{Support code to rename types}
%* *
%*********************************************************
\begin{code}
-derivingNonStdClassErr clas sty
- = hsep [ptext SLIT("non-standard class"), ppr sty clas, ptext SLIT("in deriving clause")]
-
-classTyVarNotInOpTyErr clas_tyvar sig sty
- = hang (hsep [ptext SLIT("Class type variable"),
- ppr sty clas_tyvar,
- ptext SLIT("does not appear in method signature")])
- 4 (ppr sty sig)
-
-dupClassAssertWarn ctxt ((clas,ty) : dups) sty
- = sep [hsep [ptext SLIT("Duplicated class assertion"),
- pprQuote sty $ \ sty -> ppr sty clas <+> ppr sty ty,
- ptext SLIT("in context:")],
- nest 4 (pprQuote sty $ \ sty -> pprContext 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]
-
-ctxtErr1 doc tyvars sty
- = hsep [ptext SLIT("Context constrains in-scope type variable(s)"),
- hsep (punctuate comma (map (ppr sty) tyvars))]
- $$
- nest 4 (ptext SLIT("in") <+> doc sty)
+rnFds :: SDoc -> [Located (FunDep RdrName)] -> RnM [Located (FunDep Name)]
-ctxtErr2 doc tyvars ty sty
- = (ptext SLIT("Context constrains type variable(s)")
- <+> hsep (punctuate comma (map (ppr sty) tyvars)))
- $$
- nest 4 (vcat [ptext SLIT("that do not appear in") <+> ppr sty ty,
- ptext SLIT("in") <+> doc sty])
+rnFds doc fds
+ = mappM (wrapLocM rn_fds) fds
+ where
+ rn_fds (tys1, tys2)
+ = rnHsTyVars doc tys1 `thenM` \ tys1' ->
+ rnHsTyVars doc tys2 `thenM` \ tys2' ->
+ returnM (tys1', tys2')
+
+rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs
+rnHsTyvar doc tyvar = lookupOccRn tyvar
+\end{code}
+
+
+%*********************************************************
+%* *
+ Splices
+%* *
+%*********************************************************
+
+\begin{code}
+rnSplice :: HsSplice RdrName -> RnM (HsSplice Name, FreeVars)
+rnSplice (HsSplice n expr)
+ = checkTH expr "splice" `thenM_`
+ getSrcSpanM `thenM` \ loc ->
+ newLocalsRn [L loc n] `thenM` \ [n'] ->
+ rnLExpr expr `thenM` \ (expr', fvs) ->
+ returnM (HsSplice n' expr', fvs)
\end{code}