\section[RnSource]{Main pass of renamer}
\begin{code}
-module RnSource ( rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, rnSourceDecls,
- rnHsType, rnHsSigType, rnHsTypeFVs, rnHsSigTypeFVs
- ) where
+module RnSource (
+ rnSrcDecls, rnExtCoreDecls, checkModDeprec,
+ rnTyClDecl, rnIfaceRuleDecl, rnInstDecl,
+ rnBinds, rnStats,
+ ) where
#include "HsVersions.h"
import RnExpr
import HsSyn
-import HscTypes ( GlobalRdrEnv )
-import HsTypes ( hsTyVarNames, pprHsContext )
-import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, elemRdrEnv )
-import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl, RdrNameTyClDecl,
- extractRuleBndrsTyVars, extractHsTyRdrTyVars,
- extractHsCtxtRdrTyVars, extractGenericPatTyVars
+import RdrName ( RdrName, isRdrDataCon, elemRdrEnv )
+import RdrHsSyn ( RdrNameConDecl, RdrNameTyClDecl, RdrNameHsDecl,
+ RdrNameDeprecation, RdrNameFixitySig,
+ RdrNameHsBinds,
+ extractGenericPatTyVars
)
import RnHsSyn
import HsCore
-import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, renameSigsFVs )
-import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName, lookupIfaceName,
- lookupOrigNames, lookupSysBinder, newLocalsRn,
- bindLocalsFVRn,
- bindTyVarsRn, bindTyVars2Rn,
- bindTyVarsFV2Rn, extendTyVarEnvFVRn,
+import RnNames ( importsFromLocalDecls )
+import RnTypes ( rnHsType, rnHsSigType, rnHsTypeFVs, rnContext )
+
+import RnBinds ( rnTopMonoBinds, rnMonoBinds, rnMethodBinds,
+ renameSigs, renameSigsFVs )
+import RnEnv ( lookupTopBndrRn, lookupOccRn, lookupSysBndr,
+ newLocalsRn, lookupGlobalOccRn,
+ bindLocalsFVRn, bindPatSigTyVars,
+ bindTyVarsRn, extendTyVarEnvFVRn,
bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames,
- checkDupOrQualNames, checkDupNames, mapFvRn
+ checkDupOrQualNames, checkDupNames, mapFvRn,
+ lookupTopSrcBndr_maybe, lookupTopSrcBndr,
+ dataTcOccs, unknownNameErr,
+ plusGlobalRdrEnv
)
-import RnMonad
+import TcRnMonad
+import BasicTypes ( FixitySig(..) )
+import HscTypes ( ExternalPackageState(..), FixityEnv,
+ Deprecations(..), plusDeprecs )
+import Module ( moduleEnvElts )
import Class ( FunDep, DefMeth (..) )
-import DataCon ( dataConId )
-import Name ( Name, OccName, nameOccName, NamedThing(..) )
+import TyCon ( DataConDetails(..), visibleDataCons )
+import Name ( Name )
import NameSet
-import PrelInfo ( derivableClassKeys, cCallishClassKeys )
-import PrelNames ( deRefStablePtr_RDR, newStablePtr_RDR,
- bindIO_RDR, returnIO_RDR
- )
-import TysWiredIn ( tupleCon )
-import List ( partition, nub )
+import NameEnv
+import ErrUtils ( dumpIfSet )
+import PrelNames ( newStablePtrName, bindIOName, returnIOName )
+import List ( partition )
+import Bag ( bagToList )
import Outputable
import SrcLoc ( SrcLoc )
import CmdLineOpts ( DynFlag(..) )
-- Warn of unused for-all'd tyvars
-import Unique ( Uniquable(..) )
-import Maybes ( maybeToBool )
-import ErrUtils ( Message )
-import CStrings ( isCLabelString )
-import ListSetOps ( removeDupsEq )
+import Maybes ( maybeToBool, seqMaybe )
+import Maybe ( maybe, catMaybes, isNothing )
\end{code}
@rnSourceDecl@ `renames' declarations.
\end{enumerate}
+\begin{code}
+rnSrcDecls :: [RdrNameHsDecl] -> RnM (TcGblEnv, [RenamedHsDecl], FreeVars)
+
+rnSrcDecls decls
+ = do { (rdr_env, imports) <- importsFromLocalDecls decls ;
+ updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv`
+ tcg_rdr_env gbl,
+ tcg_imports = imports `plusImportAvails`
+ tcg_imports gbl })
+ $ do {
+
+ -- Deal with deprecations (returns only the extra deprecations)
+ deprecs <- rnSrcDeprecDecls [d | DeprecD d <- 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 decls ;
+ updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env })
+ $ do {
+
+ -- Rename remaining declarations
+ (rn_src_decls, src_fvs) <- rn_src_decls decls ;
+
+ tcg_env <- getGblEnv ;
+ return (tcg_env, rn_src_decls, src_fvs)
+ }}}}
+
+rnExtCoreDecls :: [RdrNameHsDecl] -> RnM ([RenamedHsDecl], FreeVars)
+rnExtCoreDecls decls = rn_src_decls decls
+
+rn_src_decls decls -- Declarartions get reversed, but no matter
+ = go emptyFVs [] decls
+ where
+ -- Fixity and deprecations have been dealt with already; ignore them
+ go fvs ds' [] = returnM (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) = rnSrcDecl d `thenM` \(d', fvs') ->
+ go (fvs `plusFV` fvs') (d':ds') ds
+\end{code}
+
+
+%*********************************************************
+%* *
+ Source-code fixity declarations
+%* *
+%*********************************************************
+
+\begin{code}
+rnSrcFixityDecls :: [RdrNameHsDecl] -> TcRn m FixityEnv
+rnSrcFixityDecls decls
+ = getGblEnv `thenM` \ gbl_env ->
+ foldlM rnFixityDecl (tcg_fix_env gbl_env)
+ fix_decls `thenM` \ fix_env ->
+ traceRn (text "fixity env" <+> ppr fix_env) `thenM_`
+ returnM fix_env
+ where
+ fix_decls = foldr get_fix_sigs [] decls
+
+ -- Get fixities from top level decls, and from class decl sigs too
+ get_fix_sigs (FixD fix) acc = fix:acc
+ get_fix_sigs (TyClD (ClassDecl { tcdSigs = sigs})) acc
+ = [sig | FixSig sig <- sigs] ++ acc
+ get_fix_sigs other_decl acc = acc
+
+rnFixityDecl :: FixityEnv -> RdrNameFixitySig -> TcRn m FixityEnv
+rnFixityDecl fix_env (FixitySig rdr_name fixity loc)
+ = -- GHC extension: look up both the tycon and data con
+ -- for con-like things
+ -- If neither are in scope, report an error; otherwise
+ -- add both to the fixity env
+ mappM lookupTopSrcBndr_maybe (dataTcOccs rdr_name) `thenM` \ maybe_ns ->
+ case catMaybes maybe_ns of
+ [] -> addSrcLoc loc $
+ addErr (unknownNameErr rdr_name) `thenM_`
+ returnM fix_env
+ ns -> foldlM add fix_env ns
+ where
+ add fix_env name
+ = case lookupNameEnv fix_env name of
+ Just (FixitySig _ _ loc') -> addErr (dupFixityDecl rdr_name loc loc') `thenM_`
+ returnM fix_env
+ Nothing -> returnM (extendNameEnv fix_env name (FixitySig name fixity loc))
+
+dupFixityDecl rdr_name loc1 loc2
+ = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
+ ptext SLIT("at ") <+> ppr loc1,
+ ptext SLIT("and") <+> ppr loc2]
+\end{code}
+
+
+%*********************************************************
+%* *
+ Source-code deprecations declarations
+%* *
+%*********************************************************
+
+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}
+rnSrcDeprecDecls :: [RdrNameDeprecation] -> TcRn m Deprecations
+rnSrcDeprecDecls []
+ = returnM NoDeprecs
+
+rnSrcDeprecDecls decls
+ = mappM rn_deprec decls `thenM` \ pairs ->
+ returnM (DeprecSome (mkNameEnv (catMaybes pairs)))
+ where
+ rn_deprec (Deprecation rdr_name txt loc)
+ = addSrcLoc loc $
+ lookupTopSrcBndr rdr_name `thenM` \ name ->
+ returnM (Just (name, (name,txt)))
+
+checkModDeprec :: Maybe DeprecTxt -> Deprecations
+-- Check for a module deprecation; done once at top level
+checkModDeprec Nothing = NoDeprecs
+checkModdeprec (Just txt) = DeprecAll txt
+
+badDeprec d
+ = sep [ptext SLIT("Illegal deprecation when whole module is deprecated"),
+ nest 4 (ppr d)]
+\end{code}
+
%*********************************************************
%* *
\subsection{Source code declarations}
%*********************************************************
\begin{code}
-rnSourceDecls :: GlobalRdrEnv -> LocalFixityEnv
- -> [RdrNameHsDecl]
- -> RnMG ([RenamedHsDecl], FreeVars)
- -- The decls get reversed, but that's ok
+rnSrcDecl :: RdrNameHsDecl -> RnM (RenamedHsDecl, FreeVars)
-rnSourceDecls gbl_env local_fixity_env decls
- = initRnMS gbl_env local_fixity_env SourceMode (go emptyFVs [] decls)
- where
- -- Fixity and deprecations have been dealt with already; ignore them
- go fvs ds' [] = returnRn (ds', fvs)
- go fvs ds' (FixD _:ds) = go fvs ds' ds
- go fvs ds' (DeprecD _:ds) = go fvs ds' ds
- go fvs ds' (d:ds) = rnSourceDecl d `thenRn` \(d', fvs') ->
- go (fvs `plusFV` fvs') (d':ds') ds
+rnSrcDecl (ValD binds) = rnTopBinds binds `thenM` \ (new_binds, fvs) ->
+ returnM (ValD new_binds, fvs)
+rnSrcDecl (TyClD tycl_decl)
+ = rnTyClDecl tycl_decl `thenM` \ new_decl ->
+ finishSourceTyClDecl tycl_decl new_decl `thenM` \ (new_decl', fvs) ->
+ returnM (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl')
-rnSourceDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
+rnSrcDecl (InstD inst)
+ = rnInstDecl inst `thenM` \ new_inst ->
+ finishSourceInstDecl inst new_inst `thenM` \ (new_inst', fvs) ->
+ returnM (InstD new_inst', fvs `plusFV` instDeclFVs new_inst')
-rnSourceDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
- returnRn (ValD new_binds, fvs)
+rnSrcDecl (RuleD rule)
+ = rnHsRuleDecl rule `thenM` \ (new_rule, fvs) ->
+ returnM (RuleD new_rule, fvs)
-rnSourceDecl (TyClD tycl_decl)
- = rnTyClDecl tycl_decl `thenRn` \ new_decl ->
- rnClassBinds tycl_decl new_decl `thenRn` \ (new_decl', fvs) ->
- returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl')
+rnSrcDecl (ForD ford)
+ = rnHsForeignDecl ford `thenM` \ (new_ford, fvs) ->
+ returnM (ForD new_ford, fvs)
-rnSourceDecl (InstD inst)
- = rnInstDecl inst `thenRn` \ new_inst ->
- rnInstBinds inst new_inst `thenRn` \ (new_inst', fvs) ->
- returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst')
+rnSrcDecl (DefD (DefaultDecl tys src_loc))
+ = addSrcLoc src_loc $
+ mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) ->
+ returnM (DefD (DefaultDecl tys' src_loc), fvs)
+ where
+ doc_str = text "In a `default' declaration"
-rnSourceDecl (RuleD rule)
- = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) ->
- returnRn (RuleD new_rule, fvs)
-rnSourceDecl (DefD (DefaultDecl tys src_loc))
- = pushSrcLocRn src_loc $
- mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) ->
- returnRn (DefD (DefaultDecl tys' src_loc), fvs)
+rnSrcDecl (CoreD (CoreDecl name ty rhs loc))
+ = addSrcLoc loc $
+ lookupTopBndrRn name `thenM` \ name' ->
+ rnHsTypeFVs doc_str ty `thenM` \ (ty', ty_fvs) ->
+ rnCoreExpr rhs `thenM` \ rhs' ->
+ returnM (CoreD (CoreDecl name' ty' rhs' loc),
+ ty_fvs `plusFV` ufExprFVs rhs')
where
- doc_str = text "a `default' declaration"
+ doc_str = text "In the Core declaration for" <+> quotes (ppr name)
+\end{code}
-rnSourceDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
- = pushSrcLocRn src_loc $
- lookupOccRn name `thenRn` \ name' ->
- let
- extra_fvs FoExport
- | isDyn = lookupOrigNames [newStablePtr_RDR, deRefStablePtr_RDR,
- bindIO_RDR, returnIO_RDR]
- | otherwise =
- lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs ->
- returnRn (addOneFV fvs name')
- extra_fvs other = returnRn emptyFVs
- in
- checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_`
+%*********************************************************
+%* *
+ Bindings
+%* *
+%*********************************************************
- extra_fvs imp_exp `thenRn` \ fvs1 ->
+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}
+rnTopBinds :: RdrNameHsBinds -> RnM (RenamedHsBinds, FreeVars)
+rnTopBinds EmptyBinds = returnM (EmptyBinds, emptyFVs)
+rnTopBinds (MonoBind bind sigs _) = rnTopMonoBinds bind sigs
+ -- The parser doesn't produce other forms
+
+rnBinds :: RdrNameHsBinds
+ -> (RenamedHsBinds -> RnM (result, FreeVars))
+ -> RnM (result, FreeVars)
+rnBinds EmptyBinds thing_inside = thing_inside EmptyBinds
+rnBinds (MonoBind bind sigs _) thing_inside = rnMonoBinds bind sigs thing_inside
+ -- the parser doesn't produce other forms
+\end{code}
- rnHsTypeFVs fo_decl_msg ty `thenRn` \ (ty', fvs2) ->
- returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc),
- fvs1 `plusFV` fvs2)
- where
- fo_decl_msg = ptext SLIT("The foreign declaration for") <+> ppr name
- isDyn = isDynamicExtName ext_nm
- ok_ext_nm Dynamic = True
- ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb
- ok_ext_nm (ExtName nm Nothing) = isCLabelString nm
+%*********************************************************
+%* *
+\subsection{Foreign declarations}
+%* *
+%*********************************************************
+
+\begin{code}
+rnHsForeignDecl (ForeignImport name ty spec isDeprec src_loc)
+ = addSrcLoc src_loc $
+ lookupTopBndrRn name `thenM` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
+ returnM (ForeignImport name' ty' spec isDeprec src_loc,
+ fvs `plusFV` extras spec)
+ where
+ extras (CImport _ _ _ _ CWrapper) = mkFVs [newStablePtrName,
+ bindIOName, returnIOName]
+ extras _ = emptyFVs
+
+rnHsForeignDecl (ForeignExport name ty spec isDeprec src_loc)
+ = addSrcLoc src_loc $
+ lookupOccRn name `thenM` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
+ returnM (ForeignExport name' ty' spec isDeprec src_loc,
+ mkFVs [name', bindIOName, returnIOName] `plusFV` fvs )
+ -- NB: a foreign export is an *occurrence site* for name, so
+ -- we add it to the free-variable list. It might, for example,
+ -- be imported from another module
+
+fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name
\end{code}
\begin{code}
rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)
-- Used for both source and interface file decls
- = pushSrcLocRn src_loc $
- rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
+ = addSrcLoc src_loc $
+ rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' ->
(case maybe_dfun_rdr_name of
- Nothing -> returnRn Nothing
- Just dfun_rdr_name -> lookupIfaceName dfun_rdr_name `thenRn` \ dfun_name ->
- returnRn (Just dfun_name)
- ) `thenRn` \ maybe_dfun_name ->
+ Nothing -> returnM Nothing
+ Just dfun_rdr_name -> lookupGlobalOccRn dfun_rdr_name `thenM` \ dfun_name ->
+ returnM (Just dfun_name)
+ ) `thenM` \ maybe_dfun_name ->
-- The typechecker checks that all the bindings are for the right class.
- returnRn (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc)
+ returnM (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc)
--- Compare rnClassBinds
-rnInstBinds (InstDecl _ mbinds uprags _ _ )
- (InstDecl inst_ty _ _ maybe_dfun_name src_loc)
+-- Compare finishSourceTyClDecl
+finishSourceInstDecl (InstDecl _ mbinds uprags _ _ )
+ (InstDecl inst_ty _ _ maybe_dfun_name src_loc)
-- Used for both source decls only
= ASSERT( not (maybeToBool maybe_dfun_name) ) -- Source decl!
let
- meth_doc = text "the bindings in an instance declaration"
+ meth_doc = text "In the bindings in an instance declaration"
meth_names = collectLocatedMonoBinders mbinds
- inst_tyvars = case inst_ty of
- HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars
- other -> []
+ (inst_tyvars, _, cls,_) = splitHsInstDeclTy inst_ty
-- (Slightly strangely) the forall-d tyvars scope over
-- the method bindings too
in
-- Rename the bindings
-- NB meth_names can be qualified!
- checkDupNames meth_doc meth_names `thenRn_`
- extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) (
- rnMethodBinds [] mbinds
- ) `thenRn` \ (mbinds', meth_fvs) ->
+ checkDupNames meth_doc meth_names `thenM_`
+ extendTyVarEnvForMethodBinds inst_tyvars (
+ rnMethodBinds cls [] mbinds
+ ) `thenM` \ (mbinds', meth_fvs) ->
let
binders = collectMonoBinders mbinds'
binder_set = mkNameSet binders
-- But the (unqualified) method names are in scope
bindLocalNames binders (
renameSigsFVs (okInstDclSig binder_set) uprags
- ) `thenRn` \ (uprags', prag_fvs) ->
+ ) `thenM` \ (uprags', prag_fvs) ->
- returnRn (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc,
+ returnM (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc,
meth_fvs `plusFV` prag_fvs)
\end{code}
%*********************************************************
\begin{code}
-rnIfaceRuleDecl (IfaceRule rule_name vars fn args rhs src_loc)
- = pushSrcLocRn src_loc $
- lookupOccRn fn `thenRn` \ fn' ->
+rnIfaceRuleDecl (IfaceRule rule_name act vars fn args rhs src_loc)
+ = addSrcLoc src_loc $
+ lookupOccRn fn `thenM` \ fn' ->
rnCoreBndrs vars $ \ vars' ->
- mapRn rnCoreExpr args `thenRn` \ args' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (IfaceRule rule_name vars' fn' args' rhs' src_loc)
+ mappM rnCoreExpr args `thenM` \ args' ->
+ rnCoreExpr rhs `thenM` \ rhs' ->
+ returnM (IfaceRule rule_name act vars' fn' args' rhs' src_loc)
+
+rnIfaceRuleDecl (IfaceRuleOut fn rule) -- Builtin rules come this way
+ = lookupOccRn fn `thenM` \ fn' ->
+ returnM (IfaceRuleOut fn' rule)
-rnHsRuleDecl (HsRule rule_name tvs vars lhs rhs src_loc)
- = ASSERT( null tvs )
- pushSrcLocRn src_loc $
+rnHsRuleDecl (HsRule rule_name act vars lhs rhs src_loc)
+ = addSrcLoc src_loc $
+ bindPatSigTyVars (collectRuleBndrSigTys vars) $
- 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) ->
+ mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) ->
- rnExpr lhs `thenRn` \ (lhs', fv_lhs) ->
- rnExpr rhs `thenRn` \ (rhs', fv_rhs) ->
- checkRn (validRuleLhs ids lhs')
- (badRuleLhsErr rule_name lhs') `thenRn_`
+ rnExpr lhs `thenM` \ (lhs', fv_lhs) ->
+ rnExpr rhs `thenM` \ (rhs', fv_rhs) ->
+ let
+ mb_bad = validRuleLhs ids lhs'
+ in
+ checkErr (isNothing mb_bad)
+ (badRuleLhsErr rule_name lhs' mb_bad) `thenM_`
let
bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
in
- mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
- returnRn (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc,
+ mappM (addErr . badRuleVar rule_name) bad_vars `thenM_`
+ returnM (HsRule rule_name act vars' lhs' rhs' src_loc,
fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
where
- doc = text "the transformation rule" <+> ptext rule_name
- sig_tvs = extractRuleBndrsTyVars vars
+ doc = text "In the transformation rule" <+> ftext rule_name
get_var (RuleBndr v) = v
get_var (RuleBndrSig v _) = v
- rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
- rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenRn` \ (t', fvs) ->
- returnRn (RuleBndrSig id t', fvs)
+ rn_var (RuleBndr v, id) = returnM (RuleBndr id, emptyFVs)
+ rn_var (RuleBndrSig v t, id) = rnHsTypeFVs doc t `thenM` \ (t', fvs) ->
+ returnM (RuleBndrSig id t', fvs)
+\end{code}
+
+Check the shape of a transformation rule LHS. Currently
+we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
+not one of the @forall@'d variables. We also restrict the form of the LHS so
+that it may be plausibly matched. Basically you only get to write ordinary
+applications. (E.g. a case expression is not allowed: too elaborate.)
+
+NB: if you add new cases here, make sure you add new ones to TcRule.ruleLhsTvs
+
+\begin{code}
+validRuleLhs :: [Name] -> RenamedHsExpr -> Maybe RenamedHsExpr
+-- Nothing => OK
+-- Just e => Not ok, and e is the offending expression
+validRuleLhs foralls lhs
+ = check lhs
+ where
+ check (OpApp e1 op _ e2) = check op `seqMaybe` check_e e1 `seqMaybe` check_e e2
+ check (HsApp e1 e2) = check e1 `seqMaybe` check_e e2
+ check (HsVar v) | v `notElem` foralls = Nothing
+ check other = Just other -- Failure
+
+ check_e (HsVar v) = Nothing
+ check_e (HsPar e) = check_e e
+ check_e (HsLit e) = Nothing
+ check_e (HsOverLit e) = Nothing
+
+ check_e (OpApp e1 op _ e2) = check_e e1 `seqMaybe` check_e op `seqMaybe` check_e e2
+ check_e (HsApp e1 e2) = check_e e1 `seqMaybe` check_e e2
+ check_e (NegApp e _) = check_e e
+ check_e (ExplicitList _ es) = check_es es
+ check_e (ExplicitTuple es _) = check_es es
+ check_e other = Just other -- Fails
+
+ check_es es = foldr (seqMaybe . check_e) Nothing es
\end{code}
\begin{code}
rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc})
- = pushSrcLocRn loc $
- lookupTopBndrRn name `thenRn` \ name' ->
- rnHsType doc_str ty `thenRn` \ ty' ->
- mapRn rnIdInfo id_infos `thenRn` \ id_infos' ->
- returnRn (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc})
+ = addSrcLoc loc $
+ lookupTopBndrRn name `thenM` \ name' ->
+ rnHsType doc_str ty `thenM` \ ty' ->
+ mappM rnIdInfo id_infos `thenM` \ id_infos' ->
+ returnM (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc})
where
- doc_str = text "the interface signature for" <+> quotes (ppr name)
+ doc_str = text "In the interface signature for" <+> quotes (ppr name)
+
+rnTyClDecl (ForeignType {tcdName = name, tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
+ = addSrcLoc loc $
+ lookupTopBndrRn name `thenM` \ name' ->
+ returnM (ForeignType {tcdName = name', tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon,
- tcdTyVars = tyvars, tcdCons = condecls, tcdNCons = nconstrs,
- tcdDerivs = derivings, tcdLoc = src_loc, tcdSysNames = sys_names})
- = pushSrcLocRn src_loc $
- lookupTopBndrRn tycon `thenRn` \ tycon' ->
+ tcdTyVars = tyvars, tcdCons = condecls, tcdGeneric = want_generic,
+ tcdDerivs = derivs, tcdLoc = src_loc})
+ = addSrcLoc src_loc $
+ lookupTopBndrRn tycon `thenM` \ tycon' ->
bindTyVarsRn data_doc tyvars $ \ tyvars' ->
- rnContext data_doc context `thenRn` \ context' ->
- checkDupOrQualNames data_doc con_names `thenRn_`
- mapRn rnConDecl condecls `thenRn` \ condecls' ->
- mapRn lookupSysBinder sys_names `thenRn` \ sys_names' ->
- rnDerivs derivings `thenRn` \ derivings' ->
- returnRn (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon',
- tcdTyVars = tyvars', tcdCons = condecls', tcdNCons = nconstrs,
- tcdDerivs = derivings', tcdLoc = src_loc, tcdSysNames = sys_names'})
+ rnContext data_doc context `thenM` \ context' ->
+ rn_derivs derivs `thenM` \ derivs' ->
+ checkDupOrQualNames data_doc con_names `thenM_`
+
+ rnConDecls tycon' condecls `thenM` \ condecls' ->
+ returnM (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon',
+ tcdTyVars = tyvars', tcdCons = condecls', tcdGeneric = want_generic,
+ tcdDerivs = derivs', tcdLoc = src_loc})
where
- data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
- con_names = map conDeclName condecls
+ data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
+ con_names = map conDeclName (visibleDataCons condecls)
+ rn_derivs Nothing = returnM Nothing
+ rn_derivs (Just ds) = rnContext data_doc ds `thenM` \ ds' -> returnM (Just ds')
+
rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc})
- = pushSrcLocRn src_loc $
- doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
- lookupTopBndrRn name `thenRn` \ name' ->
+ = addSrcLoc src_loc $
+ lookupTopBndrRn name `thenM` \ name' ->
bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
- rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ ty' ->
- returnRn (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc})
+ rnHsType syn_doc ty `thenM` \ ty' ->
+ returnM (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc})
where
- syn_doc = text "the declaration for type synonym" <+> quotes (ppr name)
-
- -- For H98 we do *not* universally quantify on the RHS of a synonym
- -- Silently discard context... but the tyvars in the rest won't be in scope
- -- In interface files all types are quantified, so this is a no-op
- unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty
- unquantify glaExys ty = ty
+ syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name)
rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname,
tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
- tcdSysNames = names, tcdLoc = src_loc})
+ tcdLoc = src_loc})
-- Used for both source and interface file decls
- = pushSrcLocRn src_loc $
-
- lookupTopBndrRn cname `thenRn` \ cname' ->
+ = addSrcLoc src_loc $
- -- Deal with the implicit tycon and datacon name
- -- They aren't in scope (because they aren't visible to the user)
- -- and what we want to do is simply look them up in the cache;
- -- we jolly well ought to get a 'hit' there!
- mapRn lookupSysBinder names `thenRn` \ names' ->
+ lookupTopBndrRn cname `thenM` \ cname' ->
- -- Tyvars scope over bindings and context
- bindTyVars2Rn cls_doc tyvars $ \ clas_tyvar_names tyvars' ->
+ -- Tyvars scope over superclass context and method signatures
+ bindTyVarsRn cls_doc tyvars $ \ tyvars' ->
-- Check the superclasses
- rnContext cls_doc context `thenRn` \ context' ->
+ rnContext cls_doc context `thenM` \ context' ->
-- Check the functional dependencies
- rnFds cls_doc fds `thenRn` \ fds' ->
+ rnFds cls_doc fds `thenM` \ fds' ->
-- Check the signatures
-- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
(op_sigs, non_op_sigs) = partition isClassOpSig sigs
sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
in
- checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
- mapRn (rnClassOp cname' clas_tyvar_names fds') op_sigs `thenRn` \ sigs' ->
+ checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenM_`
+ mappM (rnClassOp cname' fds') op_sigs `thenM` \ sigs' ->
let
binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
in
- renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ non_ops' ->
+ renameSigs (okClsDclSig binders) non_op_sigs `thenM` \ non_ops' ->
-- Typechecker is responsible for checking that we only
-- give default-method bindings for things in this class.
-- The renamer *could* check this for class decls, but can't
-- for instance decls.
- returnRn (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars',
- tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing,
- tcdSysNames = names', tcdLoc = src_loc})
+ returnM (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars',
+ tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing,
+ tcdLoc = src_loc})
where
- cls_doc = text "the declaration for class" <+> ppr cname
- sig_doc = text "the signatures for class" <+> ppr cname
+ cls_doc = text "In the declaration for class" <+> ppr cname
+ sig_doc = text "In the signatures for class" <+> ppr cname
-rnClassOp clas clas_tyvars clas_fds sig@(ClassOpSig op dm_stuff ty locn)
- = pushSrcLocRn locn $
- lookupTopBndrRn op `thenRn` \ op_name ->
+rnClassOp clas clas_fds sig@(ClassOpSig op dm_stuff ty locn)
+ = addSrcLoc locn $
+ lookupTopBndrRn op `thenM` \ op_name ->
-- Check the signature
- rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
+ rnHsSigType (quotes (ppr op)) ty `thenM` \ new_ty ->
-- Make the default-method name
(case dm_stuff of
DefMeth dm_rdr_name
-> -- Imported class that has a default method decl
- -- See comments with tname, snames, above
- lookupSysBinder dm_rdr_name `thenRn` \ dm_name ->
- returnRn (DefMeth dm_name)
+ lookupSysBndr dm_rdr_name `thenM` \ dm_name ->
+ returnM (DefMeth dm_name)
-- An imported class decl for a class decl that had an explicit default
-- method, mentions, rather than defines,
-- the default method, so we must arrange to pull it in
- GenDefMeth -> returnRn GenDefMeth
- NoDefMeth -> returnRn NoDefMeth
- ) `thenRn` \ dm_stuff' ->
+ GenDefMeth -> returnM GenDefMeth
+ NoDefMeth -> returnM NoDefMeth
+ ) `thenM` \ dm_stuff' ->
- returnRn (ClassOpSig op_name dm_stuff' new_ty locn)
+ returnM (ClassOpSig op_name dm_stuff' new_ty locn)
-rnClassBinds :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars)
+finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnM (RenamedTyClDecl, FreeVars)
-- Used for source file decls only
-rnClassBinds (ClassDecl {tcdMeths = Just mbinds}) -- Get mbinds from here
- rn_cls_decl@(ClassDecl {tcdTyVars = tyvars, tcdLoc = src_loc}) -- Everything else is here
+ -- Renames the default-bindings of a class decl
+finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here
+ rn_cls_decl@(ClassDecl {tcdName = cls, tcdTyVars = tyvars}) -- Everything else is here
-- There are some default-method bindings (abeit possibly empty) so
-- this is a source-code class declaration
= -- The newLocals call is tiresome: given a generic class decl
-- we want to name both "x" tyvars with the same unique, so that they are
-- easy to group together in the typechecker.
-- Hence the
- extendTyVarEnvFVRn (map hsTyVarName tyvars) $
- getLocalNameEnv `thenRn` \ name_env ->
+ addSrcLoc src_loc $
+ extendTyVarEnvForMethodBinds tyvars $
+ getLocalRdrEnv `thenM` \ name_env ->
let
meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
not (tv `elemRdrEnv` name_env)]
in
- checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- newLocalsRn gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars ->
- rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
- returnRn (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs)
+ checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenM_`
+ newLocalsRn gen_rdr_tyvars_w_locs `thenM` \ gen_tyvars ->
+ rnMethodBinds cls gen_tyvars mbinds `thenM` \ (mbinds', meth_fvs) ->
+ returnM (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs)
where
- meth_doc = text "the default-methods for class" <+> ppr (tcdName rn_cls_decl)
-
-rnClassBinds _ tycl_decl = returnRn (tycl_decl, emptyFVs)
+ meth_doc = text "In the default-methods for class" <+> ppr (tcdName rn_cls_decl)
+
+finishSourceTyClDecl _ tycl_decl@(TyData {tcdDerivs = derivings})
+ -- Derivings are returned here so that they don't form part of the tyClDeclFVs.
+ -- This is important, because tyClDeclFVs should contain only the
+ -- FVs that are `needed' by the interface file declaration, and
+ -- derivings do not appear in this. It also means that the tcGroups
+ -- are smaller, which turned out to be important for the usage inference. KSW 2002-02.
+ = returnM (tycl_decl,
+ maybe emptyFVs extractHsCtxtTyNames derivings)
+
+finishSourceTyClDecl _ tycl_decl = returnM (tycl_decl, emptyFVs)
-- Not a class declaration
\end{code}
+For the method bindings in class and instance decls, we extend the
+type variable environment iff -fglasgow-exts
+
+\begin{code}
+extendTyVarEnvForMethodBinds tyvars thing_inside
+ = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts ->
+ if opt_GlasgowExts then
+ extendTyVarEnvFVRn (map hsTyVarName tyvars) thing_inside
+ else
+ thing_inside
+\end{code}
+
%*********************************************************
%* *
%*********************************************************
\begin{code}
-rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name])
-
-rnDerivs Nothing -- derivs not specified
- = returnRn Nothing
-
-rnDerivs (Just clss)
- = mapRn do_one clss `thenRn` \ clss' ->
- returnRn (Just clss')
- where
- 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)
-
-rnConDecl :: RdrNameConDecl -> RnMS RenamedConDecl
-rnConDecl (ConDecl name wkr tvs cxt details locn)
- = pushSrcLocRn locn $
- checkConName name `thenRn_`
- lookupTopBndrRn name `thenRn` \ new_name ->
-
- lookupSysBinder wkr `thenRn` \ new_wkr ->
- -- See comments with ClassDecl
+conDeclName (ConDecl n _ _ _ l) = (n,l)
+
+rnConDecls :: Name -> DataConDetails RdrNameConDecl -> RnM (DataConDetails RenamedConDecl)
+rnConDecls tycon Unknown = returnM Unknown
+rnConDecls tycon (HasCons n) = returnM (HasCons n)
+rnConDecls tycon (DataCons condecls)
+ = -- Check that there's at least one condecl,
+ -- or else we're reading an interface file, or -fglasgow-exts
+ (if null condecls then
+ doptM Opt_GlasgowExts `thenM` \ glaExts ->
+ getModeRn `thenM` \ mode ->
+ checkErr (glaExts || isInterfaceMode mode)
+ (emptyConDeclsErr tycon)
+ else returnM ()
+ ) `thenM_`
+
+ mappM rnConDecl condecls `thenM` \ condecls' ->
+ returnM (DataCons condecls')
+
+rnConDecl :: RdrNameConDecl -> RnM RenamedConDecl
+rnConDecl (ConDecl name tvs cxt details locn)
+ = addSrcLoc locn $
+ checkConName name `thenM_`
+ lookupTopBndrRn name `thenM` \ new_name ->
bindTyVarsRn doc tvs $ \ new_tyvars ->
- rnContext doc cxt `thenRn` \ new_context ->
- rnConDetails doc locn details `thenRn` \ new_details ->
- returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn)
+ rnContext doc cxt `thenM` \ new_context ->
+ rnConDetails doc locn details `thenM` \ new_details ->
+ returnM (ConDecl new_name new_tyvars new_context new_details locn)
where
- doc = text "the definition of data constructor" <+> quotes (ppr name)
+ doc = text "In the definition of data constructor" <+> quotes (ppr name)
-rnConDetails doc locn (VanillaCon tys)
- = mapRn (rnBangTy doc) tys `thenRn` \ new_tys ->
- returnRn (VanillaCon new_tys)
+rnConDetails doc locn (PrefixCon tys)
+ = mappM (rnBangTy doc) tys `thenM` \ new_tys ->
+ returnM (PrefixCon new_tys)
rnConDetails doc locn (InfixCon ty1 ty2)
- = rnBangTy doc ty1 `thenRn` \ new_ty1 ->
- rnBangTy doc ty2 `thenRn` \ new_ty2 ->
- returnRn (InfixCon new_ty1 new_ty2)
+ = rnBangTy doc ty1 `thenM` \ new_ty1 ->
+ rnBangTy doc ty2 `thenM` \ new_ty2 ->
+ returnM (InfixCon new_ty1 new_ty2)
rnConDetails doc locn (RecCon fields)
- = checkDupOrQualNames doc field_names `thenRn_`
- mapRn (rnField doc) fields `thenRn` \ new_fields ->
- returnRn (RecCon new_fields)
+ = checkDupOrQualNames doc field_names `thenM_`
+ mappM (rnField doc) fields `thenM` \ new_fields ->
+ returnM (RecCon new_fields)
where
- field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
-
-rnField doc (names, ty)
- = mapRn lookupTopBndrRn names `thenRn` \ new_names ->
- rnBangTy doc ty `thenRn` \ new_ty ->
- returnRn (new_names, new_ty)
+ field_names = [(fld, locn) | (fld, _) <- fields]
-rnBangTy doc (Banged ty)
- = rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (Banged new_ty)
+rnField doc (name, ty)
+ = lookupTopBndrRn name `thenM` \ new_name ->
+ rnBangTy doc ty `thenM` \ new_ty ->
+ returnM (new_name, new_ty)
-rnBangTy doc (Unbanged ty)
- = rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (Unbanged new_ty)
-
-rnBangTy doc (Unpacked ty)
- = rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (Unpacked new_ty)
+rnBangTy doc (BangType s ty)
+ = rnHsType doc ty `thenM` \ new_ty ->
+ returnM (BangType s new_ty)
-- This data decl will parse OK
-- data T = a Int
-- from interface files, which always print in prefix form
checkConName name
- = checkRn (isRdrDataCon name)
- (badDataCon name)
+ = checkErr (isRdrDataCon name) (badDataCon name)
\end{code}
%*********************************************************
\begin{code}
-rnHsTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
-rnHsTypeFVs doc_str ty
- = rnHsType doc_str ty `thenRn` \ ty' ->
- returnRn (ty', extractHsTyNames ty')
-
-rnHsSigTypeFVs :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
-rnHsSigTypeFVs doc_str ty
- = rnHsSigType doc_str ty `thenRn` \ ty' ->
- returnRn (ty', extractHsTyNames ty')
-
-rnHsSigType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType
- -- rnHsSigType is used for source-language type signatures,
- -- which use *implicit* universal quantification.
-rnHsSigType doc_str ty
- = rnHsType (text "the type signature for" <+> doc_str) ty
-
----------------------------------------
-rnHsType :: SDoc -> RdrNameHsType -> RnMS RenamedHsType
-
-rnHsType doc (HsForAllTy Nothing ctxt ty)
- -- Implicit quantifiction in source code (no kinds on tyvars)
- -- Given the signature C => T we universally quantify
- -- over FV(T) \ {in-scope-tyvars}
- = getLocalNameEnv `thenRn` \ name_env ->
- let
- mentioned_in_tau = extractHsTyRdrTyVars ty
- mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
- mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
- forall_tyvars = filter (not . (`elemRdrEnv` name_env)) mentioned
- in
- rnForAll doc (map UserTyVar forall_tyvars) ctxt ty
-
-rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau)
- -- Explicit quantification.
- -- Check that the forall'd tyvars are actually
- -- mentioned in the type, and produce a warning if not
- = let
- mentioned_in_tau = extractHsTyRdrTyVars tau
- mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
- mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
- forall_tyvar_names = hsTyVarNames forall_tyvars
-
- -- Explicitly quantified but not mentioned in ctxt or tau
- warn_guys = filter (`notElem` mentioned) forall_tyvar_names
- in
- mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
- rnForAll doc forall_tyvars ctxt tau
-
-rnHsType doc (HsTyVar tyvar)
- = lookupOccRn tyvar `thenRn` \ tyvar' ->
- returnRn (HsTyVar tyvar')
-
-rnHsType doc (HsOpTy ty1 opname ty2)
- = lookupOccRn opname `thenRn` \ name' ->
- rnHsType doc ty1 `thenRn` \ ty1' ->
- rnHsType doc ty2 `thenRn` \ ty2' ->
- returnRn (HsOpTy ty1' name' ty2')
-
-rnHsType doc (HsNumTy i)
- | i == 1 = returnRn (HsNumTy i)
- | otherwise = failWithRn (HsNumTy i)
- (ptext SLIT("Only unit numeric type pattern is valid"))
-
-rnHsType doc (HsFunTy ty1 ty2)
- = rnHsType doc ty1 `thenRn` \ ty1' ->
- -- Might find a for-all as the arg of a function type
- rnHsType doc ty2 `thenRn` \ ty2' ->
- -- Or as the result. This happens when reading Prelude.hi
- -- when we find return :: forall m. Monad m -> forall a. a -> m a
- returnRn (HsFunTy ty1' ty2')
-
-rnHsType doc (HsListTy ty)
- = rnHsType doc ty `thenRn` \ ty' ->
- returnRn (HsListTy ty')
-
--- Unboxed tuples are allowed to have poly-typed arguments. These
--- sometimes crop up as a result of CPR worker-wrappering dictionaries.
-rnHsType doc (HsTupleTy (HsTupCon _ boxity arity) tys)
- -- Don't do lookupOccRn, because this is built-in syntax
- -- so it doesn't need to be in scope
- = mapRn (rnHsType doc) tys `thenRn` \ tys' ->
- returnRn (HsTupleTy (HsTupCon tup_name boxity arity) tys')
- where
- tup_name = tupleTyCon_name boxity arity
-
-
-rnHsType doc (HsAppTy ty1 ty2)
- = rnHsType doc ty1 `thenRn` \ ty1' ->
- rnHsType doc ty2 `thenRn` \ ty2' ->
- returnRn (HsAppTy ty1' ty2')
-
-rnHsType doc (HsPredTy pred)
- = rnPred doc pred `thenRn` \ pred' ->
- returnRn (HsPredTy pred')
-
-rnHsTypes doc tys = mapRn (rnHsType doc) tys
-\end{code}
-
-\begin{code}
-rnForAll doc forall_tyvars ctxt ty
- = bindTyVarsRn doc forall_tyvars $ \ new_tyvars ->
- rnContext doc ctxt `thenRn` \ new_ctxt ->
- rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty)
-\end{code}
-
-\begin{code}
-rnContext :: SDoc -> RdrNameContext -> RnMS RenamedContext
-rnContext doc ctxt
- = mapRn rn_pred ctxt `thenRn` \ theta ->
- let
- (_, 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) dups `thenRn_`
- returnRn theta
- where
- --Someone discovered that @CCallable@ and @CReturnable@
- -- could be used in contexts such as:
- -- foo :: CCallable a => a -> PrimIO Int
- -- Doing this utterly wrecks the whole point of introducing these
- -- classes so we specifically check that this isn't being done.
- rn_pred pred = rnPred doc pred `thenRn` \ pred'->
- checkRn (not (bad_pred pred'))
- (naughtyCCallContextErr pred') `thenRn_`
- returnRn pred'
-
- bad_pred (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' ->
- returnRn (HsPClass clas_name tys')
-
-rnPred doc (HsPIParam n ty)
- = newIPName n `thenRn` \ name ->
- rnHsType doc ty `thenRn` \ ty' ->
- returnRn (HsPIParam name ty')
-\end{code}
-
-\begin{code}
-rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name]
+rnFds :: SDoc -> [FunDep RdrName] -> RnM [FunDep Name]
rnFds doc fds
- = mapRn rn_fds fds
+ = mappM rn_fds fds
where
rn_fds (tys1, tys2)
- = rnHsTyVars doc tys1 `thenRn` \ tys1' ->
- rnHsTyVars doc tys2 `thenRn` \ tys2' ->
- returnRn (tys1', tys2')
+ = rnHsTyVars doc tys1 `thenM` \ tys1' ->
+ rnHsTyVars doc tys2 `thenM` \ tys2' ->
+ returnM (tys1', tys2')
-rnHsTyVars doc tvs = mapRn (rnHsTyvar doc) tvs
+rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs
rnHsTyvar doc tyvar = lookupOccRn tyvar
\end{code}
%*********************************************************
\begin{code}
-rnIdInfo (HsWorker worker)
- = lookupOccRn worker `thenRn` \ worker' ->
- returnRn (HsWorker worker')
-
-rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (HsUnfold inline expr')
-rnIdInfo (HsStrictness str) = returnRn (HsStrictness str)
-rnIdInfo (HsArity arity) = returnRn (HsArity arity)
-rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs
-rnIdInfo HsCprInfo = returnRn HsCprInfo
+rnIdInfo (HsWorker worker arity)
+ = lookupOccRn worker `thenM` \ worker' ->
+ returnM (HsWorker worker' arity)
+
+rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenM` \ expr' ->
+ returnM (HsUnfold inline expr')
+rnIdInfo (HsStrictness str) = returnM (HsStrictness str)
+rnIdInfo (HsArity arity) = returnM (HsArity arity)
+rnIdInfo HsNoCafRefs = returnM HsNoCafRefs
\end{code}
@UfCore@ expressions.
\begin{code}
rnCoreExpr (UfType ty)
- = rnHsType (text "unfolding type") ty `thenRn` \ ty' ->
- returnRn (UfType ty')
+ = rnHsType (text "unfolding type") ty `thenM` \ ty' ->
+ returnM (UfType ty')
rnCoreExpr (UfVar v)
- = lookupOccRn v `thenRn` \ v' ->
- returnRn (UfVar v')
+ = lookupOccRn v `thenM` \ v' ->
+ returnM (UfVar v')
rnCoreExpr (UfLit l)
- = returnRn (UfLit l)
+ = returnM (UfLit l)
rnCoreExpr (UfLitLit l ty)
- = rnHsType (text "litlit") ty `thenRn` \ ty' ->
- returnRn (UfLitLit l ty')
+ = rnHsType (text "litlit") ty `thenM` \ ty' ->
+ returnM (UfLitLit l ty')
-rnCoreExpr (UfCCall cc ty)
- = rnHsType (text "ccall") ty `thenRn` \ ty' ->
- returnRn (UfCCall cc ty')
+rnCoreExpr (UfFCall cc ty)
+ = rnHsType (text "ccall") ty `thenM` \ ty' ->
+ returnM (UfFCall cc ty')
-rnCoreExpr (UfTuple (HsTupCon _ boxity arity) args)
- = mapRn rnCoreExpr args `thenRn` \ args' ->
- returnRn (UfTuple (HsTupCon tup_name boxity arity) args')
- where
- tup_name = getName (dataConId (tupleCon boxity arity))
- -- Get the *worker* name and use that
+rnCoreExpr (UfTuple (HsTupCon boxity arity) args)
+ = mappM rnCoreExpr args `thenM` \ args' ->
+ returnM (UfTuple (HsTupCon boxity arity) args')
rnCoreExpr (UfApp fun arg)
- = rnCoreExpr fun `thenRn` \ fun' ->
- rnCoreExpr arg `thenRn` \ arg' ->
- returnRn (UfApp fun' arg')
+ = rnCoreExpr fun `thenM` \ fun' ->
+ rnCoreExpr arg `thenM` \ arg' ->
+ returnM (UfApp fun' arg')
rnCoreExpr (UfCase scrut bndr alts)
- = rnCoreExpr scrut `thenRn` \ scrut' ->
+ = rnCoreExpr scrut `thenM` \ scrut' ->
bindCoreLocalRn bndr $ \ bndr' ->
- mapRn rnCoreAlt alts `thenRn` \ alts' ->
- returnRn (UfCase scrut' bndr' alts')
+ mappM rnCoreAlt alts `thenM` \ alts' ->
+ returnM (UfCase scrut' bndr' alts')
rnCoreExpr (UfNote note expr)
- = rnNote note `thenRn` \ note' ->
- rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (UfNote note' expr')
+ = rnNote note `thenM` \ note' ->
+ rnCoreExpr expr `thenM` \ expr' ->
+ returnM (UfNote note' expr')
rnCoreExpr (UfLam bndr body)
= rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLam bndr' body')
+ rnCoreExpr body `thenM` \ body' ->
+ returnM (UfLam bndr' body')
rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
- = rnCoreExpr rhs `thenRn` \ rhs' ->
+ = rnCoreExpr rhs `thenM` \ rhs' ->
rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfNonRec bndr' rhs') body')
+ rnCoreExpr body `thenM` \ body' ->
+ returnM (UfLet (UfNonRec bndr' rhs') body')
rnCoreExpr (UfLet (UfRec pairs) body)
= rnCoreBndrs bndrs $ \ bndrs' ->
- mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
+ mappM rnCoreExpr rhss `thenM` \ rhss' ->
+ rnCoreExpr body `thenM` \ body' ->
+ returnM (UfLet (UfRec (bndrs' `zip` rhss')) body')
where
(bndrs, rhss) = unzip pairs
\end{code}
\begin{code}
rnCoreBndr (UfValBinder name ty) thing_inside
- = rnHsType doc ty `thenRn` \ ty' ->
+ = rnHsType doc ty `thenM` \ ty' ->
bindCoreLocalRn name $ \ name' ->
thing_inside (UfValBinder name' ty')
where
\begin{code}
rnCoreAlt (con, bndrs, rhs)
- = rnUfCon con `thenRn` \ con' ->
+ = rnUfCon con `thenM` \ con' ->
bindCoreLocalsRn bndrs $ \ bndrs' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (con', bndrs', rhs')
+ rnCoreExpr rhs `thenM` \ rhs' ->
+ returnM (con', bndrs', rhs')
rnNote (UfCoerce ty)
- = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' ->
- returnRn (UfCoerce ty')
+ = rnHsType (text "unfolding coerce") ty `thenM` \ ty' ->
+ returnM (UfCoerce ty')
-rnNote (UfSCC cc) = returnRn (UfSCC cc)
-rnNote UfInlineCall = returnRn UfInlineCall
-rnNote UfInlineMe = returnRn UfInlineMe
+rnNote (UfSCC cc) = returnM (UfSCC cc)
+rnNote UfInlineCall = returnM UfInlineCall
+rnNote UfInlineMe = returnM UfInlineMe
rnUfCon UfDefault
- = returnRn UfDefault
+ = returnM UfDefault
-rnUfCon (UfTupleAlt (HsTupCon _ boxity arity))
- = returnRn (UfTupleAlt (HsTupCon tup_name boxity arity))
- where
- tup_name = getName (tupleCon boxity arity)
+rnUfCon (UfTupleAlt tup_con)
+ = returnM (UfTupleAlt tup_con)
rnUfCon (UfDataAlt con)
- = lookupOccRn con `thenRn` \ con' ->
- returnRn (UfDataAlt con')
+ = lookupOccRn con `thenM` \ con' ->
+ returnM (UfDataAlt con')
rnUfCon (UfLitAlt lit)
- = returnRn (UfLitAlt lit)
+ = returnM (UfLitAlt lit)
rnUfCon (UfLitLitAlt lit ty)
- = rnHsType (text "litlit") ty `thenRn` \ ty' ->
- returnRn (UfLitLitAlt lit ty')
+ = rnHsType (text "litlit") ty `thenM` \ ty' ->
+ returnM (UfLitLitAlt lit ty')
\end{code}
%*********************************************************
-%* *
-\subsection{Rule shapes}
-%* *
+%* *
+\subsection{Statistics}
+%* *
%*********************************************************
-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
+rnStats :: [RenamedHsDecl] -- Imported decls
+ -> TcRn m ()
+rnStats imp_decls
+ = doptM Opt_D_dump_rn_trace `thenM` \ dump_rn_trace ->
+ doptM Opt_D_dump_rn_stats `thenM` \ dump_rn_stats ->
+ doptM Opt_D_dump_rn `thenM` \ dump_rn ->
+ getEps `thenM` \ eps ->
+
+ ioToTcRn (dumpIfSet (dump_rn_trace || dump_rn_stats || dump_rn)
+ "Renamer statistics"
+ (getRnStats eps imp_decls)) `thenM_`
+ returnM ()
+
+getRnStats :: ExternalPackageState -> [RenamedHsDecl] -> SDoc
+getRnStats eps imported_decls
+ = hcat [text "Renamer stats: ", stats]
where
- check (HsApp e1 e2) = check e1
- check (HsVar v) | v `notElem` foralls = True
- check other = False
-\end{code}
+ n_mods = length [() | _ <- moduleEnvElts (eps_PIT eps)]
+ -- This is really only right for a one-shot compile
+ (decls_map, n_decls_slurped) = eps_decls eps
+
+ n_decls_left = length [decl | (avail, True, (_,decl)) <- nameEnvElts decls_map
+ -- Data, newtype, and class decls are in the decls_fm
+ -- under multiple names; the tycon/class, and each
+ -- constructor/class op too.
+ -- The 'True' selects just the 'main' decl
+ ]
+
+ (insts_left, n_insts_slurped) = eps_insts eps
+ n_insts_left = length (bagToList insts_left)
+
+ (rules_left, n_rules_slurped) = eps_rules eps
+ n_rules_left = length (bagToList rules_left)
+
+ stats = vcat
+ [int n_mods <+> text "interfaces read",
+ hsep [ int n_decls_slurped, text "type/class/variable imported, out of",
+ int (n_decls_slurped + n_decls_left), text "read"],
+ hsep [ int n_insts_slurped, text "instance decls imported, out of",
+ int (n_insts_slurped + n_insts_left), text "read"],
+ hsep [ int n_rules_slurped, text "rule decls imported, out of",
+ int (n_rules_slurped + n_rules_left), text "read"]
+ ]
+\end{code}
%*********************************************************
%* *
%*********************************************************
\begin{code}
-derivingNonStdClassErr clas
- = hsep [ptext SLIT("non-standard class"), ppr clas, ptext SLIT("in deriving clause")]
-
badDataCon name
= hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
-forAllWarn doc ty tyvar
- = 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))]
- $$
- (ptext SLIT("In") <+> doc)
- )
- }
-
-badRuleLhsErr name lhs
- = sep [ptext SLIT("Rule") <+> ptext name <> colon,
- nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)]
+badRuleLhsErr name lhs (Just bad_e)
+ = sep [ptext SLIT("Rule") <+> ftext name <> colon,
+ nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e,
+ ptext SLIT("in left-hand side:") <+> ppr lhs])]
$$
ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
badRuleVar name var
- = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ = 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")]
-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")]
+emptyConDeclsErr tycon
+ = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"),
+ nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))]
\end{code}
projects / ghc-hetmet.git / blobdiff