tcg_fords = [],
tcg_dfun_n = dfun_n_var,
tcg_keep = keep_var,
- tcg_doc = Nothing,
- tcg_hmi = HaddockModInfo Nothing Nothing Nothing Nothing,
- tcg_hpc = False
+ tcg_doc_hdr = Nothing,
+ tcg_hpc = False,
+ tcg_main = Nothing
} ;
lcl_env = TcLclEnv {
tcl_errs = errs_var,
getEps :: TcRnIf gbl lcl ExternalPackageState
getEps = do { env <- getTopEnv; readMutVar (hsc_EPS env) }
--- Updating the EPS. This should be an atomic operation.
--- Note the delicate 'seq' which forces the EPS before putting it in the
--- variable. Otherwise what happens is that we get
--- write eps_var (....(unsafeRead eps_var)....)
--- and if the .... is strict, that's obviously bottom. By forcing it beforehand
--- we make the unsafeRead happen before we update the variable.
-
+-- | Update the external package state. Returns the second result of the
+-- modifier function.
+--
+-- This is an atomic operation and forces evaluation of the modified EPS in
+-- order to avoid space leaks.
updateEps :: (ExternalPackageState -> (ExternalPackageState, a))
-> TcRnIf gbl lcl a
-updateEps upd_fn = do { traceIf (text "updating EPS")
- ; eps_var <- getEpsVar
- ; eps <- readMutVar eps_var
- ; let { (eps', val) = upd_fn eps }
- ; seq eps' (writeMutVar eps_var eps')
- ; return val }
+updateEps upd_fn = do
+ traceIf (text "updating EPS")
+ eps_var <- getEpsVar
+ atomicUpdMutVar' eps_var upd_fn
+-- | Update the external package state.
+--
+-- This is an atomic operation and forces evaluation of the modified EPS in
+-- order to avoid space leaks.
updateEps_ :: (ExternalPackageState -> ExternalPackageState)
-> TcRnIf gbl lcl ()
-updateEps_ upd_fn = do { traceIf (text "updating EPS_")
- ; eps_var <- getEpsVar
- ; eps <- readMutVar eps_var
- ; let { eps' = upd_fn eps }
- ; seq eps' (writeMutVar eps_var eps') }
+updateEps_ upd_fn = do
+ traceIf (text "updating EPS_")
+ eps_var <- getEpsVar
+ atomicUpdMutVar' eps_var (\eps -> (upd_fn eps, ()))
getHpt :: TcRnIf gbl lcl HomePackageTable
getHpt = do { env <- getTopEnv; return (hsc_HPT env) }
{ ctxt <- getErrCtxt
; loc <- getSrcSpanM
; env0 <- tcInitTidyEnv
- ; ctxt_msgs <- do_ctxt env0 ctxt
- ; let real_doc = mkLocMessage loc (vcat (doc : ctxt_to_use ctxt_msgs))
+ ; err_info <- mkErrInfo env0 ctxt
+ ; let real_doc = mkLocMessage loc (doc $$ err_info)
; dumpTcRn real_doc }
dumpTcRn :: SDoc -> TcRn ()
return (b, L loc c)
\end{code}
+Reporting errors
\begin{code}
getErrsVar :: TcRn (TcRef Messages)
failWith :: Message -> TcRn a
failWith msg = addErr msg >> failM
-addLocErr :: Located e -> (e -> Message) -> TcRn ()
-addLocErr (L loc e) fn = addErrAt loc (fn e)
-
addErrAt :: SrcSpan -> Message -> TcRn ()
-addErrAt loc msg = addLongErrAt loc msg empty
-
-addLongErrAt :: SrcSpan -> Message -> Message -> TcRn ()
-addLongErrAt loc msg extra
- = do { traceTc (ptext (sLit "Adding error:") <+> (mkLocMessage loc (msg $$ extra))) ;
- errs_var <- getErrsVar ;
- rdr_env <- getGlobalRdrEnv ;
- dflags <- getDOpts ;
- let { err = mkLongErrMsg loc (mkPrintUnqualified dflags rdr_env) msg extra } ;
- (warns, errs) <- readMutVar errs_var ;
- writeMutVar errs_var (warns, errs `snocBag` err) }
+-- addErrAt is mainly (exclusively?) used by the renamer, where
+-- tidying is not an issue, but it's all lazy so the extra
+-- work doesn't matter
+addErrAt loc msg = do { ctxt <- getErrCtxt
+ ; tidy_env <- tcInitTidyEnv
+ ; err_info <- mkErrInfo tidy_env ctxt
+ ; addLongErrAt loc msg err_info }
addErrs :: [(SrcSpan,Message)] -> TcRn ()
addErrs msgs = mapM_ add msgs
where
add (loc,msg) = addErrAt loc msg
-addReport :: Message -> TcRn ()
-addReport msg = do loc <- getSrcSpanM; addReportAt loc msg
-
-addReportAt :: SrcSpan -> Message -> TcRn ()
-addReportAt loc msg
- = do { errs_var <- getErrsVar ;
- rdr_env <- getGlobalRdrEnv ;
- dflags <- getDOpts ;
- let { warn = mkWarnMsg loc (mkPrintUnqualified dflags rdr_env) msg } ;
- (warns, errs) <- readMutVar errs_var ;
- writeMutVar errs_var (warns `snocBag` warn, errs) }
-
addWarn :: Message -> TcRn ()
-addWarn msg = addReport (ptext (sLit "Warning:") <+> msg)
+addWarn msg = addReport (ptext (sLit "Warning:") <+> msg) empty
addWarnAt :: SrcSpan -> Message -> TcRn ()
-addWarnAt loc msg = addReportAt loc (ptext (sLit "Warning:") <+> msg)
-
-addLocWarn :: Located e -> (e -> Message) -> TcRn ()
-addLocWarn (L loc e) fn = addReportAt loc (fn e)
+addWarnAt loc msg = addReportAt loc (ptext (sLit "Warning:") <+> msg) empty
checkErr :: Bool -> Message -> TcRn ()
-- Add the error if the bool is False
\end{code}
+%************************************************************************
+%* *
+ Shared error message stuff: renamer and typechecker
+%* *
+%************************************************************************
+
+\begin{code}
+addReport :: Message -> Message -> TcRn ()
+addReport msg extra_info = do loc <- getSrcSpanM; addReportAt loc msg extra_info
+
+addReportAt :: SrcSpan -> Message -> Message -> TcRn ()
+addReportAt loc msg extra_info
+ = do { errs_var <- getErrsVar ;
+ rdr_env <- getGlobalRdrEnv ;
+ dflags <- getDOpts ;
+ let { warn = mkLongWarnMsg loc (mkPrintUnqualified dflags rdr_env)
+ msg extra_info } ;
+ (warns, errs) <- readMutVar errs_var ;
+ writeMutVar errs_var (warns `snocBag` warn, errs) }
+
+addLongErrAt :: SrcSpan -> Message -> Message -> TcRn ()
+addLongErrAt loc msg extra
+ = do { traceTc (ptext (sLit "Adding error:") <+> (mkLocMessage loc (msg $$ extra))) ;
+ errs_var <- getErrsVar ;
+ rdr_env <- getGlobalRdrEnv ;
+ dflags <- getDOpts ;
+ let { err = mkLongErrMsg loc (mkPrintUnqualified dflags rdr_env) msg extra } ;
+ (warns, errs) <- readMutVar errs_var ;
+ writeMutVar errs_var (warns, errs `snocBag` err) }
+\end{code}
+
+
\begin{code}
try_m :: TcRn r -> TcRn (Either IOEnvFailure r)
-- Does try_m, with a debug-trace on failure
%************************************************************************
%* *
- Context management and error message generation
- for the type checker
+ Context management for the type checker
%* *
%************************************************************************
\begin{code}
-getErrCtxt :: TcM ErrCtxt
+getErrCtxt :: TcM [ErrCtxt]
getErrCtxt = do { env <- getLclEnv; return (tcl_ctxt env) }
-setErrCtxt :: ErrCtxt -> TcM a -> TcM a
+setErrCtxt :: [ErrCtxt] -> TcM a -> TcM a
setErrCtxt ctxt = updLclEnv (\ env -> env { tcl_ctxt = ctxt })
addErrCtxt :: Message -> TcM a -> TcM a
addErrCtxt msg = addErrCtxtM (\env -> return (env, msg))
addErrCtxtM :: (TidyEnv -> TcM (TidyEnv, Message)) -> TcM a -> TcM a
-addErrCtxtM msg = updCtxt (\ msgs -> msg : msgs)
+addErrCtxtM ctxt = updCtxt (\ ctxts -> (False, ctxt) : ctxts)
+
+addLandmarkErrCtxt :: Message -> TcM a -> TcM a
+addLandmarkErrCtxt msg = updCtxt (\ctxts -> (True, \env -> return (env,msg)) : ctxts)
-- Helper function for the above
-updCtxt :: (ErrCtxt -> ErrCtxt) -> TcM a -> TcM a
+updCtxt :: ([ErrCtxt] -> [ErrCtxt]) -> TcM a -> TcM a
updCtxt upd = updLclEnv (\ env@(TcLclEnv { tcl_ctxt = ctxt }) ->
env { tcl_ctxt = upd ctxt })
= setSrcSpan src_loc (setErrCtxt ctxt thing_inside)
\end{code}
+%************************************************************************
+%* *
+ Error message generation (type checker)
+%* *
+%************************************************************************
+
The addErrTc functions add an error message, but do not cause failure.
The 'M' variants pass a TidyEnv that has already been used to
tidy up the message; we then use it to tidy the context messages
addWarnTcM :: (TidyEnv, Message) -> TcM ()
addWarnTcM (env0, msg)
= do { ctxt <- getErrCtxt ;
- ctxt_msgs <- do_ctxt env0 ctxt ;
- addReport (vcat (ptext (sLit "Warning:") <+> msg : ctxt_to_use ctxt_msgs)) }
+ err_info <- mkErrInfo env0 ctxt ;
+ addReport (ptext (sLit "Warning:") <+> msg) err_info }
warnTc :: Bool -> Message -> TcM ()
warnTc warn_if_true warn_msg
\begin{code}
add_err_tcm :: TidyEnv -> Message -> SrcSpan
- -> [TidyEnv -> TcM (TidyEnv, SDoc)]
+ -> [ErrCtxt]
-> TcM ()
add_err_tcm tidy_env err_msg loc ctxt
- = do { ctxt_msgs <- do_ctxt tidy_env ctxt ;
- addLongErrAt loc err_msg (vcat (ctxt_to_use ctxt_msgs)) }
-
-do_ctxt :: TidyEnv -> [TidyEnv -> TcM (TidyEnv, SDoc)] -> TcM [SDoc]
-do_ctxt _ []
- = return []
-do_ctxt tidy_env (c:cs)
- = do { (tidy_env', m) <- c tidy_env ;
- ms <- do_ctxt tidy_env' cs ;
- return (m:ms) }
-
-ctxt_to_use :: [SDoc] -> [SDoc]
-ctxt_to_use ctxt | opt_PprStyle_Debug = ctxt
- | otherwise = take 3 ctxt
+ = do { err_info <- mkErrInfo tidy_env ctxt ;
+ addLongErrAt loc err_msg err_info }
+
+mkErrInfo :: TidyEnv -> [ErrCtxt] -> TcM SDoc
+-- Tidy the error info, trimming excessive contexts
+mkErrInfo env ctxts
+ = go 0 env ctxts
+ where
+ go :: Int -> TidyEnv -> [ErrCtxt] -> TcM SDoc
+ go _ _ [] = return empty
+ go n env ((is_landmark, ctxt) : ctxts)
+ | is_landmark || opt_PprStyle_Debug || n < mAX_CONTEXTS
+ = do { (env', msg) <- ctxt env
+ ; let n' = if is_landmark then n else n+1
+ ; rest <- go n' env' ctxts
+ ; return (msg $$ rest) }
+ | otherwise
+ = go n env ctxts
+
+mAX_CONTEXTS :: Int -- No more than this number of non-landmark contexts
+mAX_CONTEXTS = 3
\end{code}
debugTc is useful for monadic debugging code
projects / ghc-hetmet.git / blobdiff