import {-# SOURCE #-} RnExpr( rnLExpr )
import HsSyn
-import RdrName ( RdrName, isRdrDataCon, elemLocalRdrEnv )
-import RdrHsSyn ( extractGenericPatTyVars )
+import RdrName ( RdrName, isRdrDataCon, elemLocalRdrEnv, globalRdrEnvElts,
+ GlobalRdrElt(..), isLocalGRE )
+import RdrHsSyn ( extractGenericPatTyVars, extractHsRhoRdrTyVars )
import RnHsSyn
import RnTypes ( rnLHsType, rnLHsTypes, rnHsSigType, rnHsTypeFVs, rnContext )
import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs )
import Name ( Name, nameOccName )
import NameSet
import NameEnv
+import OccName ( occEnvElts )
import Outputable
import SrcLoc ( Located(..), unLoc, getLoc, noLoc )
import DynFlags ( DynFlag(..) )
import Maybes ( seqMaybe )
import Maybe ( isNothing )
+import BasicTypes ( Boxity(..) )
\end{code}
@rnSourceDecl@ `renames' declarations.
-- Deal with top-level fixity decls
-- (returns the total new fixity env)
- fix_env <- rnSrcFixityDecls fix_decls ;
+ fix_env <- rnSrcFixityDeclsEnv fix_decls ;
+ rn_fix_decls <- rnSrcFixityDecls fix_decls ;
updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env })
$ do {
rn_group = HsGroup { hs_valds = rn_val_decls,
hs_tyclds = rn_tycl_decls,
hs_instds = rn_inst_decls,
- hs_fixds = [],
+ hs_fixds = rn_fix_decls,
hs_depds = [],
hs_fords = rn_foreign_decls,
hs_defds = rn_default_decls,
%*********************************************************
\begin{code}
-rnSrcFixityDecls :: [LFixitySig RdrName] -> RnM FixityEnv
+rnSrcFixityDecls :: [LFixitySig RdrName] -> RnM [LFixitySig Name]
rnSrcFixityDecls fix_decls
+ = do fix_decls <- mapM rnFixityDecl fix_decls
+ return (concat fix_decls)
+
+rnFixityDecl :: LFixitySig RdrName -> RnM [LFixitySig Name]
+rnFixityDecl (L loc (FixitySig (L nameLoc rdr_name) fixity))
+ = do names <- lookupLocalDataTcNames rdr_name
+ return [ L loc (FixitySig (L nameLoc name) fixity)
+ | name <- names ]
+
+rnSrcFixityDeclsEnv :: [LFixitySig RdrName] -> RnM FixityEnv
+rnSrcFixityDeclsEnv fix_decls
= getGblEnv `thenM` \ gbl_env ->
- foldlM rnFixityDecl (tcg_fix_env gbl_env)
+ foldlM rnFixityDeclEnv (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))
+rnFixityDeclEnv :: FixityEnv -> LFixitySig RdrName -> RnM FixityEnv
+rnFixityDeclEnv fix_env (L loc (FixitySig rdr_name fixity))
= setSrcSpan loc $
-- GHC extension: look up both the tycon and data con
-- for con-like things
%*********************************************************
\begin{code}
-rnHsRuleDecl (HsRule rule_name act vars lhs rhs)
+rnHsRuleDecl (HsRule rule_name act vars lhs fv_lhs rhs fv_rhs)
= bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $
bindLocatedLocalsFV doc (map get_var vars) $ \ ids ->
mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) ->
- rnLExpr lhs `thenM` \ (lhs', fv_lhs) ->
- rnLExpr rhs `thenM` \ (rhs', fv_rhs) ->
+ 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)]
+ 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)
+ returnM (HsRule rule_name act vars' lhs' fv_lhs' rhs' fv_rhs',
+ fv_vars `plusFV` fv_lhs' `plusFV` fv_rhs')
where
doc = text "In the transformation rule" <+> ftext rule_name
deriv_fvs) }
| otherwise -- GADT
- = ASSERT( null (unLoc context) )
- do { tycon' <- lookupLocatedTopBndrRn tycon
- ; tyvars' <- bindTyVarsRn data_doc tyvars
+ = do { tycon' <- lookupLocatedTopBndrRn tycon
+ ; checkTc (null (unLoc context)) (badGadtStupidTheta tycon)
+ ; tyvars' <- bindTyVarsRn data_doc tyvars
(\ tyvars' -> return tyvars')
-- For GADTs, the type variables in the declaration
-- do not scope over the constructor signatures
where
is_vanilla = case condecls of -- Yuk
[] -> True
- L _ (ConDecl {}) : _ -> True
+ L _ (ConDecl { con_res = ResTyH98 }) : _ -> True
other -> False
data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
con_names = map con_names_helper condecls
- con_names_helper (L _ (ConDecl n _ _ _)) = n
- con_names_helper (L _ (GadtDecl n _)) = n
+ con_names_helper (L _ c) = con_name c
rn_derivs Nothing = returnM (Nothing, emptyFVs)
rn_derivs (Just ds) = rnLHsTypes data_doc ds `thenM` \ ds' ->
-- Check the signatures
-- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
let
- sig_rdr_names_w_locs = [op | L _ (Sig op _) <- sigs]
+ sig_rdr_names_w_locs = [op | L _ (TypeSig op _) <- sigs]
in
checkDupNames sig_doc sig_rdr_names_w_locs `thenM_`
-- Typechecker is responsible for checking that we only
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
+
+badGadtStupidTheta tycon
+ = vcat [ptext SLIT("No context is allowed on a GADT-style data declaration"),
+ ptext SLIT("(You can put a context on each contructor, though.)")]
\end{code}
%*********************************************************
= 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
- doc = text "In the definition of data constructor" <+> quotes (ppr name)
+rnConDecl (ConDecl name expl tvs cxt details res_ty)
+ = do { addLocM checkConName name
-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)
+ ; new_name <- lookupLocatedTopBndrRn name
+ ; name_env <- getLocalRdrEnv
+
+ -- For H98 syntax, the tvs are the existential ones
+ -- For GADT syntax, the tvs are all the quantified tyvars
+ -- Hence the 'filter' in the ResTyH98 case only
+ ; let not_in_scope = not . (`elemLocalRdrEnv` name_env) . unLoc
+ arg_tys = hsConArgs details
+ implicit_tvs = case res_ty of
+ ResTyH98 -> filter not_in_scope $
+ get_rdr_tvs arg_tys
+ ResTyGADT ty -> get_rdr_tvs (ty : arg_tys)
+ tvs' = case expl of
+ Explicit -> tvs
+ Implicit -> userHsTyVarBndrs implicit_tvs
+
+ ; bindTyVarsRn doc tvs' $ \new_tyvars -> do
+ { new_context <- rnContext doc cxt
+ ; new_details <- rnConDetails doc details
+ ; new_res_ty <- rnConResult doc res_ty
+ ; let rv = ConDecl new_name expl new_tyvars new_context new_details new_res_ty
+ ; traceRn (text "****** - autrijus" <> ppr rv)
+ ; return rv } }
where
doc = text "In the definition of data constructor" <+> quotes (ppr name)
+ get_rdr_tvs tys = extractHsRhoRdrTyVars cxt (noLoc (HsTupleTy Boxed tys))
+
+rnConResult _ ResTyH98 = return ResTyH98
+rnConResult doc (ResTyGADT ty) = do
+ ty' <- rnHsSigType doc ty
+ return $ ResTyGADT ty'
rnConDetails doc (PrefixCon tys)
= mappM (rnLHsType doc) tys `thenM` \ new_tys ->
%* *
%*********************************************************
+Note [Splices]
+~~~~~~~~~~~~~~
+Consider
+ f = ...
+ h = ...$(thing "f")...
+
+The splice can expand into literally anything, so when we do dependency
+analysis we must assume that it might mention 'f'. So we simply treat
+all locally-defined names as mentioned by any splice. This is terribly
+brutal, but I don't see what else to do. For example, it'll mean
+that every locally-defined thing will appear to be used, so no unused-binding
+warnings. But if we miss the dependency, then we might typecheck 'h' before 'f',
+and that will crash the type checker because 'f' isn't in scope.
+
+Currently, I'm not treating a splice as also mentioning every import,
+which is a bit inconsistent -- but there are a lot of them. We might
+thereby get some bogus unused-import warnings, but we won't crash the
+type checker. Not very satisfactory really.
+
\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)
+ = do { checkTH expr "splice"
+ ; loc <- getSrcSpanM
+ ; [n'] <- newLocalsRn [L loc n]
+ ; (expr', fvs) <- rnLExpr expr
+
+ -- Ugh! See Note [Splices] above
+ ; lcl_rdr <- getLocalRdrEnv
+ ; gbl_rdr <- getGlobalRdrEnv
+ ; let gbl_names = mkNameSet [gre_name gre | gre <- globalRdrEnvElts gbl_rdr,
+ isLocalGRE gre]
+ lcl_names = mkNameSet (occEnvElts lcl_rdr)
+
+ ; return (HsSplice n' expr', fvs `plusFV` lcl_names `plusFV` gbl_names) }
#ifdef GHCI
checkTH e what = returnM () -- OK
projects / ghc-hetmet.git / blobdiff