import TcType
import InstEnv
import FamInstEnv
+import PrelNames ( iNTERACTIVE )
import Var
import Id
initTc hsc_env hsc_src keep_rn_syntax mod do_this
= do { errs_var <- newIORef (emptyBag, emptyBag) ;
+ meta_var <- newIORef initTyVarUnique ;
tvs_var <- newIORef emptyVarSet ;
- dfuns_var <- newIORef emptyNameSet ;
- keep_var <- newIORef emptyNameSet ;
- used_rdrnames_var <- newIORef Set.empty ;
+ keep_var <- newIORef emptyNameSet ;
+ used_rdr_var <- newIORef Set.empty ;
th_var <- newIORef False ;
+ lie_var <- newIORef emptyWC ;
dfun_n_var <- newIORef emptyOccSet ;
type_env_var <- case hsc_type_env_var hsc_env of {
Just (_mod, te_var) -> return te_var ;
Nothing -> newIORef emptyNameEnv } ;
let {
- maybe_rn_syntax empty_val
+ maybe_rn_syntax :: forall a. a -> Maybe a ;
+ maybe_rn_syntax empty_val
| keep_rn_syntax = Just empty_val
| otherwise = Nothing ;
gbl_env = TcGblEnv {
tcg_mod = mod,
tcg_src = hsc_src,
- tcg_rdr_env = hsc_global_rdr_env hsc_env,
+ tcg_rdr_env = emptyGlobalRdrEnv,
tcg_fix_env = emptyNameEnv,
tcg_field_env = RecFields emptyNameEnv emptyNameSet,
tcg_default = Nothing,
- tcg_type_env = hsc_global_type_env hsc_env,
+ tcg_type_env = emptyNameEnv,
tcg_type_env_var = type_env_var,
tcg_inst_env = emptyInstEnv,
tcg_fam_inst_env = emptyFamInstEnv,
- tcg_inst_uses = dfuns_var,
- tcg_th_used = th_var,
+ tcg_th_used = th_var,
tcg_exports = [],
tcg_imports = emptyImportAvails,
- tcg_used_rdrnames = used_rdrnames_var,
+ tcg_used_rdrnames = used_rdr_var,
tcg_dus = emptyDUs,
tcg_rn_imports = [],
tcg_rn_exports = maybe_rn_syntax [],
tcg_rn_decls = maybe_rn_syntax emptyRnGroup,
- tcg_binds = emptyLHsBinds,
- tcg_warns = NoWarnings,
- tcg_anns = [],
- tcg_insts = [],
- tcg_fam_insts= [],
- tcg_rules = [],
- tcg_fords = [],
- tcg_dfun_n = dfun_n_var,
- tcg_keep = keep_var,
- tcg_doc_hdr = Nothing,
- tcg_hpc = False,
- tcg_main = Nothing
+ tcg_binds = emptyLHsBinds,
+ tcg_imp_specs = [],
+ tcg_sigs = emptyNameSet,
+ tcg_ev_binds = emptyBag,
+ tcg_warns = NoWarnings,
+ tcg_anns = [],
+ tcg_insts = [],
+ tcg_fam_insts = [],
+ tcg_rules = [],
+ tcg_fords = [],
+ tcg_vects = [],
+ tcg_dfun_n = dfun_n_var,
+ tcg_keep = keep_var,
+ tcg_doc_hdr = Nothing,
+ tcg_hpc = False,
+ tcg_main = Nothing
} ;
lcl_env = TcLclEnv {
tcl_errs = errs_var,
tcl_arrow_ctxt = NoArrowCtxt,
tcl_env = emptyNameEnv,
tcl_tyvars = tvs_var,
- tcl_lie = panic "initTc:LIE", -- only valid inside getLIE
- tcl_tybinds = panic "initTc:tybinds"
- -- only valid inside a getTyBinds
+ tcl_lie = lie_var,
+ tcl_meta = meta_var,
+ tcl_untch = initTyVarUnique
} ;
} ;
Right res -> return (Just res)
Left _ -> return Nothing } ;
+ -- Check for unsolved constraints
+ lie <- readIORef lie_var ;
+ if isEmptyWC lie
+ then return ()
+ else pprPanic "initTc: unsolved constraints"
+ (pprWantedsWithLocs lie) ;
+
-- Collect any error messages
msgs <- readIORef errs_var ;
-> Module
-> TcM r
-> IO (Messages, Maybe r)
-initTcPrintErrors env mod todo = do
- (msgs, res) <- initTc env HsSrcFile False mod todo
- return (msgs, res)
+
+initTcPrintErrors env mod todo = initTc env HsSrcFile False mod todo
\end{code}
%************************************************************************
getDOpts :: TcRnIf gbl lcl DynFlags
getDOpts = do { env <- getTopEnv; return (hsc_dflags env) }
-doptM :: DOpt d => d -> TcRnIf gbl lcl Bool
+xoptM :: ExtensionFlag -> TcRnIf gbl lcl Bool
+xoptM flag = do { dflags <- getDOpts; return (xopt flag dflags) }
+
+doptM :: DynFlag -> TcRnIf gbl lcl Bool
doptM flag = do { dflags <- getDOpts; return (dopt flag dflags) }
-- XXX setOptM and unsetOptM operate on different types. One should be renamed.
setOptM :: ExtensionFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setOptM flag = updEnv (\ env@(Env { env_top = top }) ->
- env { env_top = top { hsc_dflags = lopt_set_flattened (hsc_dflags top) flag}} )
+ env { env_top = top { hsc_dflags = xopt_set (hsc_dflags top) flag}} )
unsetOptM :: DynFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
unsetOptM flag = updEnv (\ env@(Env { env_top = top }) ->
env { env_top = top { hsc_dflags = dopt_unset (hsc_dflags top) flag}} )
-- | Do it flag is true
-ifOptM :: DOpt d => d -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
-ifOptM flag thing_inside = do { b <- doptM flag;
+ifDOptM :: DynFlag -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
+ifDOptM flag thing_inside = do { b <- doptM flag;
+ if b then thing_inside else return () }
+
+ifXOptM :: ExtensionFlag -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
+ifXOptM flag thing_inside = do { b <- xoptM flag;
if b then thing_inside else return () }
getGhcMode :: TcRnIf gbl lcl GhcMode
%************************************************************************
\begin{code}
+newMetaUnique :: TcM Unique
+-- The uniques for TcMetaTyVars are allocated specially
+-- in guaranteed linear order, starting at zero for each module
+newMetaUnique
+ = do { env <- getLclEnv
+ ; let meta_var = tcl_meta env
+ ; uniq <- readMutVar meta_var
+ ; writeMutVar meta_var (incrUnique uniq)
+ ; return uniq }
+
newUnique :: TcRnIf gbl lcl Unique
newUnique
= do { env <- getEnv ;
- let { u_var = env_us env } ;
- us <- readMutVar u_var ;
- case splitUniqSupply us of { (us1,_) -> do {
- writeMutVar u_var us1 ;
- return $! uniqFromSupply us }}}
+ let { u_var = env_us env } ;
+ us <- readMutVar u_var ;
+ case takeUniqFromSupply us of { (uniq, us') -> do {
+ writeMutVar u_var us' ;
+ return $! uniq }}}
-- NOTE 1: we strictly split the supply, to avoid the possibility of leaving
-- a chain of unevaluated supplies behind.
-- NOTE 2: we use the uniq in the supply from the MutVar directly, and
newUniqueSupply :: TcRnIf gbl lcl UniqSupply
newUniqueSupply
= do { env <- getEnv ;
- let { u_var = env_us env } ;
- us <- readMutVar u_var ;
+ let { u_var = env_us env } ;
+ us <- readMutVar u_var ;
case splitUniqSupply us of { (us1,us2) -> do {
- writeMutVar u_var us1 ;
- return us2 }}}
+ writeMutVar u_var us1 ;
+ return us2 }}}
newLocalName :: Name -> TcRnIf gbl lcl Name
newLocalName name -- Make a clone
%************************************************************************
\begin{code}
-traceTc, traceRn, traceSplice :: SDoc -> TcRn ()
+newTcRef :: a -> TcRnIf gbl lcl (TcRef a)
+newTcRef = newMutVar
+
+readTcRef :: TcRef a -> TcRnIf gbl lcl a
+readTcRef = readMutVar
+
+writeTcRef :: TcRef a -> a -> TcRnIf gbl lcl ()
+writeTcRef = writeMutVar
+
+updTcRef :: TcRef a -> (a -> a) -> TcRnIf gbl lcl ()
+updTcRef = updMutVar
+\end{code}
+
+%************************************************************************
+%* *
+ Debugging
+%* *
+%************************************************************************
+
+\begin{code}
+traceTc :: String -> SDoc -> TcRn ()
+traceTc = traceTcN 1
+
+traceTcN :: Int -> String -> SDoc -> TcRn ()
+traceTcN level herald doc
+ | level <= opt_TraceLevel = traceOptTcRn Opt_D_dump_tc_trace $
+ hang (text herald) 2 doc
+ | otherwise = return ()
+
+traceRn, traceSplice :: SDoc -> TcRn ()
traceRn = traceOptTcRn Opt_D_dump_rn_trace
-traceTc = traceOptTcRn Opt_D_dump_tc_trace
traceSplice = traceOptTcRn Opt_D_dump_splices
-
traceIf, traceHiDiffs :: SDoc -> TcRnIf m n ()
traceIf = traceOptIf Opt_D_dump_if_trace
traceHiDiffs = traceOptIf Opt_D_dump_hi_diffs
traceOptIf :: DynFlag -> SDoc -> TcRnIf m n () -- No RdrEnv available, so qualify everything
-traceOptIf flag doc = ifOptM flag $
+traceOptIf flag doc = ifDOptM flag $
liftIO (printForUser stderr alwaysQualify doc)
traceOptTcRn :: DynFlag -> SDoc -> TcRn ()
-traceOptTcRn flag doc = ifOptM flag $ do
- { ctxt <- getErrCtxt
- ; loc <- getSrcSpanM
- ; env0 <- tcInitTidyEnv
- ; err_info <- mkErrInfo env0 ctxt
- ; let real_doc = mkLocMessage loc (doc $$ err_info)
+-- Output the message, with current location if opt_PprStyle_Debug
+traceOptTcRn flag doc = ifDOptM flag $ do
+ { loc <- getSrcSpanM
+ ; let real_doc
+ | opt_PprStyle_Debug = mkLocMessage loc doc
+ | otherwise = doc -- The full location is
+ -- usually way too much
; dumpTcRn real_doc }
dumpTcRn :: SDoc -> TcRn ()
| otherwise = dumpTcRn doc
dumpOptTcRn :: DynFlag -> SDoc -> TcRn ()
-dumpOptTcRn flag doc = ifOptM flag (dumpTcRn doc)
+dumpOptTcRn flag doc = ifDOptM flag (dumpTcRn doc)
\end{code}
setModule :: Module -> TcRn a -> TcRn a
setModule mod thing_inside = updGblEnv (\env -> env { tcg_mod = mod }) thing_inside
+getIsGHCi :: TcRn Bool
+getIsGHCi = do { mod <- getModule; return (mod == iNTERACTIVE) }
+
tcIsHsBoot :: TcRn Bool
tcIsHsBoot = do { env <- getGblEnv; return (isHsBoot (tcg_src env)) }
getSrcSpanM = do { env <- getLclEnv; return (tcl_loc env) }
setSrcSpan :: SrcSpan -> TcRn a -> TcRn a
-setSrcSpan loc thing_inside
- | isGoodSrcSpan loc = updLclEnv (\env -> env { tcl_loc = loc }) thing_inside
- | otherwise = thing_inside -- Don't overwrite useful info with useless
+setSrcSpan loc@(RealSrcSpan _) thing_inside
+ = updLclEnv (\env -> env { tcl_loc = loc }) thing_inside
+-- Don't overwrite useful info with useless:
+setSrcSpan (UnhelpfulSpan _) thing_inside = thing_inside
addLocM :: (a -> TcM b) -> Located a -> TcM b
addLocM fn (L loc a) = setSrcSpan loc $ fn a
addMessages :: Messages -> TcRn ()
addMessages (m_warns, m_errs)
= do { errs_var <- getErrsVar ;
- (warns, errs) <- readMutVar errs_var ;
- writeMutVar errs_var (warns `unionBags` m_warns,
+ (warns, errs) <- readTcRef errs_var ;
+ writeTcRef errs_var (warns `unionBags` m_warns,
errs `unionBags` m_errs) }
discardWarnings :: TcRn a -> TcRn a
discardWarnings thing_inside
| opt_PprStyle_Debug = thing_inside
| otherwise
- = do { errs_var <- newMutVar emptyMessages
+ = do { errs_var <- newTcRef emptyMessages
; result <- setErrsVar errs_var thing_inside
- ; (_warns, errs) <- readMutVar errs_var
+ ; (_warns, errs) <- readTcRef errs_var
; addMessages (emptyBag, errs)
; return result }
\end{code}
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) }
+ (warns, errs) <- readTcRef errs_var ;
+ writeTcRef 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))) ;
+ = do { traceTc "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) }
+ (warns, errs) <- readTcRef errs_var ;
+ writeTcRef errs_var (warns, errs `snocBag` err) }
+
+dumpDerivingInfo :: SDoc -> TcM ()
+dumpDerivingInfo doc
+ = do { dflags <- getDOpts
+ ; when (dopt Opt_D_dump_deriv dflags) $ do
+ { rdr_env <- getGlobalRdrEnv
+ ; let unqual = mkPrintUnqualified dflags rdr_env
+ ; liftIO (putMsgWith dflags unqual doc) } }
\end{code}
try_m thing
= do { mb_r <- tryM thing ;
case mb_r of
- Left exn -> do { traceTc (exn_msg exn); return mb_r }
+ Left exn -> do { traceTc "tryTc/recoverM recovering from" $
+ text (showException exn)
+ ; return mb_r }
Right _ -> return mb_r }
- where
- exn_msg exn = text "tryTc/recoverM recovering from" <+> text (showException exn)
-----------------------
recoverM :: TcRn r -- Recovery action; do this if the main one fails
-- It also returns all the errors and warnings accumulated by m
-- It always succeeds (never raises an exception)
tryTc m
- = do { errs_var <- newMutVar emptyMessages ;
+ = do { errs_var <- newTcRef emptyMessages ;
res <- try_m (setErrsVar errs_var m) ;
- msgs <- readMutVar errs_var ;
+ msgs <- readTcRef errs_var ;
return (msgs, case res of
Left _ -> Nothing
Right val -> Just val)
-- for the thing is propagated only if there are no errors
-- Hence it's restricted to the type-check monad
tryTcLIE thing_inside
- = do { ((msgs, mb_res), lie) <- getLIE (tryTcErrs thing_inside) ;
+ = do { ((msgs, mb_res), lie) <- captureConstraints (tryTcErrs thing_inside) ;
; case mb_res of
Nothing -> return (msgs, Nothing)
- Just val -> do { extendLIEs lie; return (msgs, Just val) }
+ Just val -> do { emitConstraints lie; return (msgs, Just val) }
}
-----------------------
-- otherwise does 'main'
ifErrsM bale_out normal
= do { errs_var <- getErrsVar ;
- msgs <- readMutVar errs_var ;
+ msgs <- readTcRef errs_var ;
dflags <- getDOpts ;
if errorsFound dflags msgs then
bale_out
updCtxt upd = updLclEnv (\ env@(TcLclEnv { tcl_ctxt = ctxt }) ->
env { tcl_ctxt = upd ctxt })
--- Conditionally add an error context
-maybeAddErrCtxt :: Maybe Message -> TcM a -> TcM a
-maybeAddErrCtxt (Just msg) thing_inside = addErrCtxt msg thing_inside
-maybeAddErrCtxt Nothing thing_inside = thing_inside
-
popErrCtxt :: TcM a -> TcM a
popErrCtxt = updCtxt (\ msgs -> case msgs of { [] -> []; (_ : ms) -> ms })
-getInstLoc :: InstOrigin -> TcM InstLoc
-getInstLoc origin
+getCtLoc :: orig -> TcM (CtLoc orig)
+getCtLoc origin
= do { loc <- getSrcSpanM ; env <- getLclEnv ;
- return (InstLoc origin loc (tcl_ctxt env)) }
+ return (CtLoc origin loc (tcl_ctxt env)) }
-setInstCtxt :: InstLoc -> TcM a -> TcM a
--- Add the SrcSpan and context from the first Inst in the list
--- (they all have similar locations)
-setInstCtxt (InstLoc _ src_loc ctxt) thing_inside
+setCtLoc :: CtLoc orig -> TcM a -> TcM a
+setCtLoc (CtLoc _ src_loc ctxt) thing_inside
= setSrcSpan src_loc (setErrCtxt ctxt thing_inside)
\end{code}
mkErrInfo :: TidyEnv -> [ErrCtxt] -> TcM SDoc
-- Tidy the error info, trimming excessive contexts
mkErrInfo env ctxts
+ | opt_PprStyle_Debug -- In -dppr-debug style the output
+ = return empty -- just becomes too voluminous
+ | otherwise
= 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
+ | is_landmark || n < mAX_CONTEXTS -- Too verbose || opt_PprStyle_Debug
= do { (env', msg) <- ctxt env
; let n' = if is_landmark then n else n+1
; rest <- go n' env' ctxts
%************************************************************************
%* *
- Type constraints (the so-called LIE)
+ Type constraints
%* *
%************************************************************************
\begin{code}
+newTcEvBinds :: TcM EvBindsVar
+newTcEvBinds = do { ref <- newTcRef emptyEvBindMap
+ ; uniq <- newUnique
+ ; return (EvBindsVar ref uniq) }
+
+extendTcEvBinds :: TcEvBinds -> EvVar -> EvTerm -> TcM TcEvBinds
+extendTcEvBinds binds@(TcEvBinds binds_var) var rhs
+ = do { addTcEvBind binds_var var rhs
+ ; return binds }
+extendTcEvBinds (EvBinds bnds) var rhs
+ = return (EvBinds (bnds `snocBag` EvBind var rhs))
+
+addTcEvBind :: EvBindsVar -> EvVar -> EvTerm -> TcM ()
+-- Add a binding to the TcEvBinds by side effect
+addTcEvBind (EvBindsVar ev_ref _) var rhs
+ = do { bnds <- readTcRef ev_ref
+ ; writeTcRef ev_ref (extendEvBinds bnds var rhs) }
+
chooseUniqueOccTc :: (OccSet -> OccName) -> TcM OccName
chooseUniqueOccTc fn =
do { env <- getGblEnv
; let dfun_n_var = tcg_dfun_n env
- ; set <- readMutVar dfun_n_var
+ ; set <- readTcRef dfun_n_var
; let occ = fn set
- ; writeMutVar dfun_n_var (extendOccSet set occ)
- ; return occ
- }
-
-getLIEVar :: TcM (TcRef LIE)
-getLIEVar = do { env <- getLclEnv; return (tcl_lie env) }
-
-setLIEVar :: TcRef LIE -> TcM a -> TcM a
-setLIEVar lie_var = updLclEnv (\ env -> env { tcl_lie = lie_var })
-
-getLIE :: TcM a -> TcM (a, [Inst])
--- (getLIE m) runs m, and returns the type constraints it generates
-getLIE thing_inside
- = do { lie_var <- newMutVar emptyLIE ;
- res <- updLclEnv (\ env -> env { tcl_lie = lie_var })
- thing_inside ;
- lie <- readMutVar lie_var ;
- return (res, lieToList lie) }
-
-extendLIE :: Inst -> TcM ()
-extendLIE inst
- = do { lie_var <- getLIEVar ;
- lie <- readMutVar lie_var ;
- writeMutVar lie_var (inst `consLIE` lie) }
-
-extendLIEs :: [Inst] -> TcM ()
-extendLIEs []
- = return ()
-extendLIEs insts
- = do { lie_var <- getLIEVar ;
- lie <- readMutVar lie_var ;
- writeMutVar lie_var (mkLIE insts `plusLIE` lie) }
-\end{code}
+ ; writeTcRef dfun_n_var (extendOccSet set occ)
+ ; return occ }
+
+getConstraintVar :: TcM (TcRef WantedConstraints)
+getConstraintVar = do { env <- getLclEnv; return (tcl_lie env) }
+
+setConstraintVar :: TcRef WantedConstraints -> TcM a -> TcM a
+setConstraintVar lie_var = updLclEnv (\ env -> env { tcl_lie = lie_var })
+
+emitConstraints :: WantedConstraints -> TcM ()
+emitConstraints ct
+ = do { lie_var <- getConstraintVar ;
+ updTcRef lie_var (`andWC` ct) }
+
+emitFlat :: WantedEvVar -> TcM ()
+emitFlat ct
+ = do { lie_var <- getConstraintVar ;
+ updTcRef lie_var (`addFlats` unitBag ct) }
+
+emitFlats :: Bag WantedEvVar -> TcM ()
+emitFlats ct
+ = do { lie_var <- getConstraintVar ;
+ updTcRef lie_var (`addFlats` ct) }
+
+emitImplication :: Implication -> TcM ()
+emitImplication ct
+ = do { lie_var <- getConstraintVar ;
+ updTcRef lie_var (`addImplics` unitBag ct) }
+
+emitImplications :: Bag Implication -> TcM ()
+emitImplications ct
+ = do { lie_var <- getConstraintVar ;
+ updTcRef lie_var (`addImplics` ct) }
+
+captureConstraints :: TcM a -> TcM (a, WantedConstraints)
+-- (captureConstraints m) runs m, and returns the type constraints it generates
+captureConstraints thing_inside
+ = do { lie_var <- newTcRef emptyWC ;
+ res <- updLclEnv (\ env -> env { tcl_lie = lie_var })
+ thing_inside ;
+ lie <- readTcRef lie_var ;
+ return (res, lie) }
+
+captureUntouchables :: TcM a -> TcM (a, Untouchables)
+captureUntouchables thing_inside
+ = do { env <- getLclEnv
+ ; low_meta <- readTcRef (tcl_meta env)
+ ; res <- setLclEnv (env { tcl_untch = low_meta })
+ thing_inside
+ ; high_meta <- readTcRef (tcl_meta env)
+ ; return (res, TouchableRange low_meta high_meta) }
+
+isUntouchable :: TcTyVar -> TcM Bool
+isUntouchable tv = do { env <- getLclEnv
+ ; return (varUnique tv < tcl_untch env) }
+
+getLclTypeEnv :: TcM (NameEnv TcTyThing)
+getLclTypeEnv = do { env <- getLclEnv; return (tcl_env env) }
-\begin{code}
setLclTypeEnv :: TcLclEnv -> TcM a -> TcM a
-- Set the local type envt, but do *not* disturb other fields,
-- notably the lie_var
= updLclEnv upd thing_inside
where
upd env = env { tcl_env = tcl_env lcl_env,
- tcl_tyvars = tcl_tyvars lcl_env }
-\end{code}
+ tcl_tyvars = tcl_tyvars lcl_env }
-
-%************************************************************************
-%* *
- Meta type variable bindings
-%* *
-%************************************************************************
-
-\begin{code}
-getTcTyVarBindsVar :: TcM (TcRef TcTyVarBinds)
-getTcTyVarBindsVar = do { env <- getLclEnv; return (tcl_tybinds env) }
-
-getTcTyVarBinds :: TcM a -> TcM (a, TcTyVarBinds)
-getTcTyVarBinds thing_inside
- = do { tybinds_var <- newMutVar emptyBag
- ; res <- updLclEnv (\ env -> env { tcl_tybinds = tybinds_var })
- thing_inside
- ; tybinds <- readMutVar tybinds_var
- ; return (res, tybinds)
- }
-
-bindMetaTyVar :: TcTyVar -> TcType -> TcM ()
-bindMetaTyVar tv ty
- = do { ASSERTM2( do { details <- readMutVar (metaTvRef tv)
- ; return (isFlexi details) }, ppr tv )
- ; tybinds_var <- getTcTyVarBindsVar
- ; tybinds <- readMutVar tybinds_var
- ; writeMutVar tybinds_var (tybinds `snocBag` TcTyVarBind tv ty)
- }
-
-getTcTyVarBindsRelation :: TcM [(TcTyVar, TcTyVarSet)]
-getTcTyVarBindsRelation
- = do { tybinds_var <- getTcTyVarBindsVar
- ; tybinds <- readMutVar tybinds_var
- ; return $ map freeTvs (bagToList tybinds)
+traceTcConstraints :: String -> TcM ()
+traceTcConstraints msg
+ = do { lie_var <- getConstraintVar
+ ; lie <- readTcRef lie_var
+ ; traceTc (msg ++ "LIE:") (ppr lie)
}
- where
- freeTvs (TcTyVarBind tv ty) = (tv, tyVarsOfType ty)
\end{code}
+
%************************************************************************
-%* *
- Template Haskell context
-%* *
+%* *
+ Template Haskell context
+%* *
%************************************************************************
\begin{code}
recordThUse :: TcM ()
-recordThUse = do { env <- getGblEnv; writeMutVar (tcg_th_used env) True }
+recordThUse = do { env <- getGblEnv; writeTcRef (tcg_th_used env) True }
keepAliveTc :: Id -> TcM () -- Record the name in the keep-alive set
keepAliveTc id
| isLocalId id = do { env <- getGblEnv;
- ; updMutVar (tcg_keep env) (`addOneToNameSet` idName id) }
+ ; updTcRef (tcg_keep env) (`addOneToNameSet` idName id) }
| otherwise = return ()
keepAliveSetTc :: NameSet -> TcM () -- Record the name in the keep-alive set
keepAliveSetTc ns = do { env <- getGblEnv;
- ; updMutVar (tcg_keep env) (`unionNameSets` ns) }
+ ; updTcRef (tcg_keep env) (`unionNameSets` ns) }
getStage :: TcM ThStage
getStage = do { env <- getLclEnv; return (tcl_th_ctxt env) }
initIfaceTcRn thing_inside
= do { tcg_env <- getGblEnv
; let { if_env = IfGblEnv { if_rec_types = Just (tcg_mod tcg_env, get_type_env) }
- ; get_type_env = readMutVar (tcg_type_env_var tcg_env) }
+ ; get_type_env = readTcRef (tcg_type_env_var tcg_env) }
; setEnvs (if_env, ()) thing_inside }
initIfaceExtCore :: IfL a -> TcRn a
-- Initialise the environment with no useful info at all
initIfaceCheck hsc_env do_this
= do let rec_types = case hsc_type_env_var hsc_env of
- Just (mod,var) -> Just (mod, readMutVar var)
+ Just (mod,var) -> Just (mod, readTcRef var)
Nothing -> Nothing
gbl_env = IfGblEnv { if_rec_types = rec_types }
initTcRnIf 'i' hsc_env gbl_env () do_this
-- Used when type-checking checking an up-to-date interface file
-- No type envt from the current module, but we do know the module dependencies
initIfaceTc iface do_this
- = do { tc_env_var <- newMutVar emptyTypeEnv
- ; let { gbl_env = IfGblEnv { if_rec_types = Just (mod, readMutVar tc_env_var) } ;
+ = do { tc_env_var <- newTcRef emptyTypeEnv
+ ; let { gbl_env = IfGblEnv { if_rec_types = Just (mod, readTcRef tc_env_var) } ;
; if_lenv = mkIfLclEnv mod doc
}
; setEnvs (gbl_env, if_lenv) (do_this tc_env_var)
failIfM msg
= do { env <- getLclEnv
; let full_msg = (if_loc env <> colon) $$ nest 2 msg
- ; liftIO (printErrs (full_msg defaultErrStyle))
+ ; liftIO (printErrs full_msg defaultErrStyle)
; failM }
--------------------
-- Bleat about errors in the forked thread, if -ddump-if-trace is on
-- Otherwise we silently discard errors. Errors can legitimately
-- happen when compiling interface signatures (see tcInterfaceSigs)
- ifOptM Opt_D_dump_if_trace
+ ifDOptM Opt_D_dump_if_trace
(print_errs (hang (text "forkM failed:" <+> doc)
- 4 (text (show exn))))
+ 2 (text (show exn))))
; traceIf (text "} ending fork (badly)" <+> doc)
; return Nothing }
}}
where
- print_errs sdoc = liftIO (printErrs (sdoc defaultErrStyle))
+ print_errs sdoc = liftIO (printErrs sdoc defaultErrStyle)
forkM :: SDoc -> IfL a -> IfL a
forkM doc thing_inside
projects / ghc-hetmet.git / blobdiff