module TcRnMonad(
initTc, initTcWithGbl, initTcInteractive, initTcRnIf,
discardResult,
getTopEnv, updTopEnv, getGblEnv, updGblEnv,
setGblEnv, getLclEnv, updLclEnv, setLclEnv,
getEnvs, setEnvs,
xoptM, doptM, goptM, woptM,
setXOptM, unsetXOptM, unsetGOptM, unsetWOptM,
whenDOptM, whenGOptM, whenWOptM,
whenXOptM, unlessXOptM,
getGhcMode,
withDoDynamicToo,
getEpsVar,
getEps,
updateEps, updateEps_,
getHpt, getEpsAndHpt,
newArrowScope, escapeArrowScope,
newUnique, newUniqueSupply, newName, newNameAt, cloneLocalName,
newSysName, newSysLocalId, newSysLocalIds,
newTcRef, readTcRef, writeTcRef, updTcRef,
traceTc, traceRn, traceOptTcRn, traceTcRn, traceTcRnForUser,
traceTcRnWithStyle,
getPrintUnqualified,
printForUserTcRn,
traceIf, traceHiDiffs, traceOptIf,
debugTc,
getIsGHCi, getGHCiMonad, getInteractivePrintName,
tcIsHsBootOrSig, tcIsHsig, tcSelfBootInfo, getGlobalRdrEnv,
getRdrEnvs, getImports,
getFixityEnv, extendFixityEnv, getRecFieldEnv,
getDeclaredDefaultTys,
addDependentFiles,
getSrcSpanM, setSrcSpan, addLocM,
wrapLocM, wrapLocFstM, wrapLocSndM,wrapLocM_,
getErrsVar, setErrsVar,
addErr,
failWith, failAt,
addErrAt, addErrs,
checkErr,
addMessages,
discardWarnings,
mkLongErrAt, mkErrDocAt, addLongErrAt, reportErrors, reportError,
reportWarning, recoverM, mapAndRecoverM, mapAndReportM, foldAndRecoverM,
attemptM, tryTc,
askNoErrs, discardErrs, tryTcDiscardingErrs,
checkNoErrs, whenNoErrs,
ifErrsM, failIfErrsM,
getErrCtxt, setErrCtxt, addErrCtxt, addErrCtxtM, addLandmarkErrCtxt,
addLandmarkErrCtxtM, updCtxt, popErrCtxt, getCtLocM, setCtLocM,
addErrTc, addErrsTc,
addErrTcM, mkErrTcM, mkErrTc,
failWithTc, failWithTcM,
checkTc, checkTcM,
failIfTc, failIfTcM,
warnIfFlag, warnIf, warnTc, warnTcM,
addWarnTc, addWarnTcM, addWarn, addWarnAt, add_warn,
mkErrInfo,
newTcEvBinds, newNoTcEvBinds, cloneEvBindsVar,
addTcEvBind, addTopEvBinds,
getTcEvTyCoVars, getTcEvBindsMap, setTcEvBindsMap,
chooseUniqueOccTc,
getConstraintVar, setConstraintVar,
emitConstraints, emitStaticConstraints, emitSimple, emitSimples,
emitImplication, emitImplications, emitInsoluble,
discardConstraints, captureConstraints, tryCaptureConstraints,
pushLevelAndCaptureConstraints,
pushTcLevelM_, pushTcLevelM, pushTcLevelsM,
getTcLevel, setTcLevel, isTouchableTcM,
getLclTypeEnv, setLclTypeEnv,
traceTcConstraints,
emitNamedWildCardHoleConstraints, emitAnonWildCardHoleConstraint,
recordThUse, recordThSpliceUse, recordTopLevelSpliceLoc,
getTopLevelSpliceLocs, keepAlive, getStage, getStageAndBindLevel, setStage,
addModFinalizersWithLclEnv,
recordUnsafeInfer, finalSafeMode, fixSafeInstances,
getLocalRdrEnv, setLocalRdrEnv,
mkIfLclEnv,
initIfaceTcRn,
initIfaceCheck,
initIfaceLcl,
initIfaceLclWithSubst,
initIfaceLoad,
getIfModule,
failIfM,
forkM_maybe,
forkM,
setImplicitEnvM,
withException,
ContainsCostCentreState(..), getCCIndexM,
module TcRnTypes,
module IOEnv
) where
#include "HsVersions.h"
import GhcPrelude
import TcRnTypes
import IOEnv
import Constraint
import TcEvidence
import TcOrigin
import GHC.Hs hiding (LIE)
import HscTypes
import Module
import RdrName
import Name
import Type
import TcType
import InstEnv
import FamInstEnv
import PrelNames
import Id
import VarSet
import VarEnv
import ErrUtils
import SrcLoc
import NameEnv
import NameSet
import Bag
import Outputable
import UniqSupply
import DynFlags
import FastString
import Panic
import Util
import Annotations
import BasicTypes( TopLevelFlag, TypeOrKind(..) )
import Maybes
import CostCentreState
import qualified GHC.LanguageExtensions as LangExt
import Data.IORef
import Control.Monad
import Data.Set ( Set )
import qualified Data.Set as Set
import TcEnv ( tcInitTidyEnv )
import qualified Data.Map as Map
initTc :: HscEnv
-> HscSource
-> Bool
-> Module
-> RealSrcSpan
-> TcM r
-> IO (Messages, Maybe r)
initTc hsc_env hsc_src keep_rn_syntax mod loc do_this
= do { keep_var <- newIORef emptyNameSet ;
used_gre_var <- newIORef [] ;
th_var <- newIORef False ;
th_splice_var<- newIORef False ;
th_locs_var <- newIORef Set.empty ;
infer_var <- newIORef (True, emptyBag) ;
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 } ;
dependent_files_var <- newIORef [] ;
static_wc_var <- newIORef emptyWC ;
cc_st_var <- newIORef newCostCentreState ;
th_topdecls_var <- newIORef [] ;
th_foreign_files_var <- newIORef [] ;
th_topnames_var <- newIORef emptyNameSet ;
th_modfinalizers_var <- newIORef [] ;
th_coreplugins_var <- newIORef [] ;
th_state_var <- newIORef Map.empty ;
th_remote_state_var <- newIORef Nothing ;
let {
dflags = hsc_dflags hsc_env ;
maybe_rn_syntax :: forall a. a -> Maybe a ;
maybe_rn_syntax empty_val
| dopt Opt_D_dump_rn_ast dflags = Just empty_val
| gopt Opt_WriteHie dflags = Just empty_val
| gopt Opt_Haddock dflags = Just empty_val
| keep_rn_syntax = Just empty_val
| otherwise = Nothing ;
gbl_env = TcGblEnv {
tcg_th_topdecls = th_topdecls_var,
tcg_th_foreign_files = th_foreign_files_var,
tcg_th_topnames = th_topnames_var,
tcg_th_modfinalizers = th_modfinalizers_var,
tcg_th_coreplugins = th_coreplugins_var,
tcg_th_state = th_state_var,
tcg_th_remote_state = th_remote_state_var,
tcg_mod = mod,
tcg_semantic_mod =
canonicalizeModuleIfHome dflags mod,
tcg_src = hsc_src,
tcg_rdr_env = emptyGlobalRdrEnv,
tcg_fix_env = emptyNameEnv,
tcg_field_env = emptyNameEnv,
tcg_default = if moduleUnitId mod == primUnitId
then Just []
else Nothing,
tcg_type_env = emptyNameEnv,
tcg_type_env_var = type_env_var,
tcg_inst_env = emptyInstEnv,
tcg_fam_inst_env = emptyFamInstEnv,
tcg_ann_env = emptyAnnEnv,
tcg_th_used = th_var,
tcg_th_splice_used = th_splice_var,
tcg_th_top_level_locs
= th_locs_var,
tcg_exports = [],
tcg_imports = emptyImportAvails,
tcg_used_gres = used_gre_var,
tcg_dus = emptyDUs,
tcg_rn_imports = [],
tcg_rn_exports =
if hsc_src == HsigFile
then Just []
else maybe_rn_syntax [],
tcg_rn_decls = maybe_rn_syntax emptyRnGroup,
tcg_tr_module = Nothing,
tcg_binds = emptyLHsBinds,
tcg_imp_specs = [],
tcg_sigs = emptyNameSet,
tcg_ev_binds = emptyBag,
tcg_warns = NoWarnings,
tcg_anns = [],
tcg_tcs = [],
tcg_insts = [],
tcg_fam_insts = [],
tcg_rules = [],
tcg_fords = [],
tcg_patsyns = [],
tcg_merged = [],
tcg_dfun_n = dfun_n_var,
tcg_keep = keep_var,
tcg_doc_hdr = Nothing,
tcg_hpc = False,
tcg_main = Nothing,
tcg_self_boot = NoSelfBoot,
tcg_safeInfer = infer_var,
tcg_dependent_files = dependent_files_var,
tcg_tc_plugins = [],
tcg_hf_plugins = [],
tcg_top_loc = loc,
tcg_static_wc = static_wc_var,
tcg_complete_matches = [],
tcg_cc_st = cc_st_var
} ;
} ;
initTcWithGbl hsc_env gbl_env loc do_this
}
initTcWithGbl :: HscEnv
-> TcGblEnv
-> RealSrcSpan
-> TcM r
-> IO (Messages, Maybe r)
initTcWithGbl hsc_env gbl_env loc do_this
= do { lie_var <- newIORef emptyWC
; errs_var <- newIORef (emptyBag, emptyBag)
; let lcl_env = TcLclEnv {
tcl_errs = errs_var,
tcl_loc = loc,
tcl_ctxt = [],
tcl_rdr = emptyLocalRdrEnv,
tcl_th_ctxt = topStage,
tcl_th_bndrs = emptyNameEnv,
tcl_arrow_ctxt = NoArrowCtxt,
tcl_env = emptyNameEnv,
tcl_bndrs = [],
tcl_lie = lie_var,
tcl_tclvl = topTcLevel
}
; maybe_res <- initTcRnIf 'a' hsc_env gbl_env lcl_env $
do { r <- tryM do_this
; case r of
Right res -> return (Just res)
Left _ -> return Nothing }
; lie <- readIORef (tcl_lie lcl_env)
; when (isJust maybe_res && not (isEmptyWC lie)) $
pprPanic "initTc: unsolved constraints" (ppr lie)
; msgs <- readIORef (tcl_errs lcl_env)
; let { final_res | errorsFound dflags msgs = Nothing
| otherwise = maybe_res }
; return (msgs, final_res)
}
where dflags = hsc_dflags hsc_env
initTcInteractive :: HscEnv -> TcM a -> IO (Messages, Maybe a)
initTcInteractive hsc_env thing_inside
= initTc hsc_env HsSrcFile False
(icInteractiveModule (hsc_IC hsc_env))
(realSrcLocSpan interactive_src_loc)
thing_inside
where
interactive_src_loc = mkRealSrcLoc (fsLit "<interactive>") 1 1
initTcRnIf :: Char
-> HscEnv
-> gbl -> lcl
-> TcRnIf gbl lcl a
-> IO a
initTcRnIf uniq_mask hsc_env gbl_env lcl_env thing_inside
= do { let { env = Env { env_top = hsc_env,
env_um = uniq_mask,
env_gbl = gbl_env,
env_lcl = lcl_env} }
; runIOEnv env thing_inside
}
discardResult :: TcM a -> TcM ()
discardResult a = a >> return ()
getTopEnv :: TcRnIf gbl lcl HscEnv
getTopEnv = do { env <- getEnv; return (env_top env) }
updTopEnv :: (HscEnv -> HscEnv) -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
updTopEnv upd = updEnv (\ env@(Env { env_top = top }) ->
env { env_top = upd top })
getGblEnv :: TcRnIf gbl lcl gbl
getGblEnv = do { Env{..} <- getEnv; return env_gbl }
updGblEnv :: (gbl -> gbl) -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
updGblEnv upd = updEnv (\ env@(Env { env_gbl = gbl }) ->
env { env_gbl = upd gbl })
setGblEnv :: gbl -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setGblEnv gbl_env = updEnv (\ env -> env { env_gbl = gbl_env })
getLclEnv :: TcRnIf gbl lcl lcl
getLclEnv = do { Env{..} <- getEnv; return env_lcl }
updLclEnv :: (lcl -> lcl) -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
updLclEnv upd = updEnv (\ env@(Env { env_lcl = lcl }) ->
env { env_lcl = upd lcl })
setLclEnv :: lcl' -> TcRnIf gbl lcl' a -> TcRnIf gbl lcl a
setLclEnv lcl_env = updEnv (\ env -> env { env_lcl = lcl_env })
getEnvs :: TcRnIf gbl lcl (gbl, lcl)
getEnvs = do { env <- getEnv; return (env_gbl env, env_lcl env) }
setEnvs :: (gbl', lcl') -> TcRnIf gbl' lcl' a -> TcRnIf gbl lcl a
setEnvs (gbl_env, lcl_env) = updEnv (\ env -> env { env_gbl = gbl_env, env_lcl = lcl_env })
xoptM :: LangExt.Extension -> TcRnIf gbl lcl Bool
xoptM flag = do { dflags <- getDynFlags; return (xopt flag dflags) }
doptM :: DumpFlag -> TcRnIf gbl lcl Bool
doptM flag = do { dflags <- getDynFlags; return (dopt flag dflags) }
goptM :: GeneralFlag -> TcRnIf gbl lcl Bool
goptM flag = do { dflags <- getDynFlags; return (gopt flag dflags) }
woptM :: WarningFlag -> TcRnIf gbl lcl Bool
woptM flag = do { dflags <- getDynFlags; return (wopt flag dflags) }
setXOptM :: LangExt.Extension -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
setXOptM flag =
updTopEnv (\top -> top { hsc_dflags = xopt_set (hsc_dflags top) flag})
unsetXOptM :: LangExt.Extension -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
unsetXOptM flag =
updTopEnv (\top -> top { hsc_dflags = xopt_unset (hsc_dflags top) flag})
unsetGOptM :: GeneralFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
unsetGOptM flag =
updTopEnv (\top -> top { hsc_dflags = gopt_unset (hsc_dflags top) flag})
unsetWOptM :: WarningFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
unsetWOptM flag =
updTopEnv (\top -> top { hsc_dflags = wopt_unset (hsc_dflags top) flag})
whenDOptM :: DumpFlag -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
whenDOptM flag thing_inside = do b <- doptM flag
when b thing_inside
whenGOptM :: GeneralFlag -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
whenGOptM flag thing_inside = do b <- goptM flag
when b thing_inside
whenWOptM :: WarningFlag -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
whenWOptM flag thing_inside = do b <- woptM flag
when b thing_inside
whenXOptM :: LangExt.Extension -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
whenXOptM flag thing_inside = do b <- xoptM flag
when b thing_inside
unlessXOptM :: LangExt.Extension -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
unlessXOptM flag thing_inside = do b <- xoptM flag
unless b thing_inside
getGhcMode :: TcRnIf gbl lcl GhcMode
getGhcMode = do { env <- getTopEnv; return (ghcMode (hsc_dflags env)) }
withDoDynamicToo :: TcRnIf gbl lcl a -> TcRnIf gbl lcl a
withDoDynamicToo =
updTopEnv (\top@(HscEnv { hsc_dflags = dflags }) ->
top { hsc_dflags = dynamicTooMkDynamicDynFlags dflags })
getEpsVar :: TcRnIf gbl lcl (TcRef ExternalPackageState)
getEpsVar = do { env <- getTopEnv; return (hsc_EPS env) }
getEps :: TcRnIf gbl lcl ExternalPackageState
getEps = do { env <- getTopEnv; readMutVar (hsc_EPS env) }
updateEps :: (ExternalPackageState -> (ExternalPackageState, a))
-> TcRnIf gbl lcl a
updateEps upd_fn = do
traceIf (text "updating EPS")
eps_var <- getEpsVar
atomicUpdMutVar' eps_var upd_fn
updateEps_ :: (ExternalPackageState -> ExternalPackageState)
-> TcRnIf gbl lcl ()
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) }
getEpsAndHpt :: TcRnIf gbl lcl (ExternalPackageState, HomePackageTable)
getEpsAndHpt = do { env <- getTopEnv; eps <- readMutVar (hsc_EPS env)
; return (eps, hsc_HPT env) }
withException :: TcRnIf gbl lcl (MaybeErr MsgDoc a) -> TcRnIf gbl lcl a
withException do_this = do
r <- do_this
dflags <- getDynFlags
case r of
Failed err -> liftIO $ throwGhcExceptionIO (ProgramError (showSDoc dflags err))
Succeeded result -> return result
newArrowScope :: TcM a -> TcM a
newArrowScope
= updLclEnv $ \env -> env { tcl_arrow_ctxt = ArrowCtxt (tcl_rdr env) (tcl_lie env) }
escapeArrowScope :: TcM a -> TcM a
escapeArrowScope
= updLclEnv $ \ env ->
case tcl_arrow_ctxt env of
NoArrowCtxt -> env
ArrowCtxt rdr_env lie -> env { tcl_arrow_ctxt = NoArrowCtxt
, tcl_lie = lie
, tcl_rdr = rdr_env }
newUnique :: TcRnIf gbl lcl Unique
newUnique
= do { env <- getEnv
; let mask = env_um env
; liftIO $! uniqFromMask mask }
newUniqueSupply :: TcRnIf gbl lcl UniqSupply
newUniqueSupply
= do { env <- getEnv
; let mask = env_um env
; liftIO $! mkSplitUniqSupply mask }
cloneLocalName :: Name -> TcM Name
cloneLocalName name = newNameAt (nameOccName name) (nameSrcSpan name)
newName :: OccName -> TcM Name
newName occ = do { loc <- getSrcSpanM
; newNameAt occ loc }
newNameAt :: OccName -> SrcSpan -> TcM Name
newNameAt occ span
= do { uniq <- newUnique
; return (mkInternalName uniq occ span) }
newSysName :: OccName -> TcRnIf gbl lcl Name
newSysName occ
= do { uniq <- newUnique
; return (mkSystemName uniq occ) }
newSysLocalId :: FastString -> TcType -> TcRnIf gbl lcl TcId
newSysLocalId fs ty
= do { u <- newUnique
; return (mkSysLocalOrCoVar fs u ty) }
newSysLocalIds :: FastString -> [TcType] -> TcRnIf gbl lcl [TcId]
newSysLocalIds fs tys
= do { us <- newUniqueSupply
; return (zipWith (mkSysLocalOrCoVar fs) (uniqsFromSupply us) tys) }
instance MonadUnique (IOEnv (Env gbl lcl)) where
getUniqueM = newUnique
getUniqueSupplyM = newUniqueSupply
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 ref fn = liftIO $ do { old <- readIORef ref
; writeIORef ref (fn old) }
traceTc :: String -> SDoc -> TcRn ()
traceTc =
labelledTraceOptTcRn Opt_D_dump_tc_trace
traceRn :: String -> SDoc -> TcRn ()
traceRn =
labelledTraceOptTcRn Opt_D_dump_rn_trace
labelledTraceOptTcRn :: DumpFlag -> String -> SDoc -> TcRn ()
labelledTraceOptTcRn flag herald doc = do
traceOptTcRn flag (formatTraceMsg herald doc)
formatTraceMsg :: String -> SDoc -> SDoc
formatTraceMsg herald doc = hang (text herald) 2 doc
traceOptTcRn :: DumpFlag -> SDoc -> TcRn ()
traceOptTcRn flag doc
= do { dflags <- getDynFlags
; when (dopt flag dflags)
(traceTcRn flag doc)
}
traceTcRn :: DumpFlag -> SDoc -> TcRn ()
traceTcRn flag doc
= do { dflags <- getDynFlags
; printer <- getPrintUnqualified dflags
; let dump_style = mkDumpStyle dflags printer
; traceTcRnWithStyle dump_style dflags flag doc }
traceTcRnForUser :: DumpFlag -> SDoc -> TcRn ()
traceTcRnForUser flag doc
= do { dflags <- getDynFlags
; printer <- getPrintUnqualified dflags
; let user_style = mkUserStyle dflags printer AllTheWay
; traceTcRnWithStyle user_style dflags flag doc }
traceTcRnWithStyle :: PprStyle -> DynFlags -> DumpFlag -> SDoc -> TcRn ()
traceTcRnWithStyle sty dflags flag doc
= do { real_doc <- prettyDoc dflags doc
; liftIO $ dumpSDocWithStyle sty dflags flag "" real_doc }
where
prettyDoc :: DynFlags -> SDoc -> TcRn SDoc
prettyDoc dflags doc = if hasPprDebug dflags
then do { loc <- getSrcSpanM; return $ mkLocMessage SevOutput loc doc }
else return doc
getPrintUnqualified :: DynFlags -> TcRn PrintUnqualified
getPrintUnqualified dflags
= do { rdr_env <- getGlobalRdrEnv
; return $ mkPrintUnqualified dflags rdr_env }
printForUserTcRn :: SDoc -> TcRn ()
printForUserTcRn doc
= do { dflags <- getDynFlags
; printer <- getPrintUnqualified dflags
; liftIO (printOutputForUser dflags printer doc) }
traceIf, traceHiDiffs :: SDoc -> TcRnIf m n ()
traceIf = traceOptIf Opt_D_dump_if_trace
traceHiDiffs = traceOptIf Opt_D_dump_hi_diffs
traceOptIf :: DumpFlag -> SDoc -> TcRnIf m n ()
traceOptIf flag doc
= whenDOptM flag $
do { dflags <- getDynFlags
; liftIO (putMsg dflags doc) }
getIsGHCi :: TcRn Bool
getIsGHCi = do { mod <- getModule
; return (isInteractiveModule mod) }
getGHCiMonad :: TcRn Name
getGHCiMonad = do { hsc <- getTopEnv; return (ic_monad $ hsc_IC hsc) }
getInteractivePrintName :: TcRn Name
getInteractivePrintName = do { hsc <- getTopEnv; return (ic_int_print $ hsc_IC hsc) }
tcIsHsBootOrSig :: TcRn Bool
tcIsHsBootOrSig = do { env <- getGblEnv; return (isHsBootOrSig (tcg_src env)) }
tcIsHsig :: TcRn Bool
tcIsHsig = do { env <- getGblEnv; return (isHsigFile (tcg_src env)) }
tcSelfBootInfo :: TcRn SelfBootInfo
tcSelfBootInfo = do { env <- getGblEnv; return (tcg_self_boot env) }
getGlobalRdrEnv :: TcRn GlobalRdrEnv
getGlobalRdrEnv = do { env <- getGblEnv; return (tcg_rdr_env env) }
getRdrEnvs :: TcRn (GlobalRdrEnv, LocalRdrEnv)
getRdrEnvs = do { (gbl,lcl) <- getEnvs; return (tcg_rdr_env gbl, tcl_rdr lcl) }
getImports :: TcRn ImportAvails
getImports = do { env <- getGblEnv; return (tcg_imports env) }
getFixityEnv :: TcRn FixityEnv
getFixityEnv = do { env <- getGblEnv; return (tcg_fix_env env) }
extendFixityEnv :: [(Name,FixItem)] -> RnM a -> RnM a
extendFixityEnv new_bit
= updGblEnv (\env@(TcGblEnv { tcg_fix_env = old_fix_env }) ->
env {tcg_fix_env = extendNameEnvList old_fix_env new_bit})
getRecFieldEnv :: TcRn RecFieldEnv
getRecFieldEnv = do { env <- getGblEnv; return (tcg_field_env env) }
getDeclaredDefaultTys :: TcRn (Maybe [Type])
getDeclaredDefaultTys = do { env <- getGblEnv; return (tcg_default env) }
addDependentFiles :: [FilePath] -> TcRn ()
addDependentFiles fs = do
ref <- fmap tcg_dependent_files getGblEnv
dep_files <- readTcRef ref
writeTcRef ref (fs ++ dep_files)
getSrcSpanM :: TcRn SrcSpan
getSrcSpanM = do { env <- getLclEnv; return (RealSrcSpan (tcl_loc env)) }
setSrcSpan :: SrcSpan -> TcRn a -> TcRn a
setSrcSpan (RealSrcSpan real_loc) thing_inside
= updLclEnv (\env -> env { tcl_loc = real_loc }) thing_inside
setSrcSpan (UnhelpfulSpan _) thing_inside = thing_inside
addLocM :: HasSrcSpan a => (SrcSpanLess a -> TcM b) -> a -> TcM b
addLocM fn (dL->L loc a) = setSrcSpan loc $ fn a
wrapLocM :: (HasSrcSpan a, HasSrcSpan b) =>
(SrcSpanLess a -> TcM (SrcSpanLess b)) -> a -> TcM b
wrapLocM fn (dL->L loc a) = setSrcSpan loc $ do { b <- fn a
; return (cL loc b) }
wrapLocFstM :: (HasSrcSpan a, HasSrcSpan b) =>
(SrcSpanLess a -> TcM (SrcSpanLess b,c)) -> a -> TcM (b, c)
wrapLocFstM fn (dL->L loc a) =
setSrcSpan loc $ do
(b,c) <- fn a
return (cL loc b, c)
wrapLocSndM :: (HasSrcSpan a, HasSrcSpan c) =>
(SrcSpanLess a -> TcM (b, SrcSpanLess c)) -> a -> TcM (b, c)
wrapLocSndM fn (dL->L loc a) =
setSrcSpan loc $ do
(b,c) <- fn a
return (b, cL loc c)
wrapLocM_ :: HasSrcSpan a =>
(SrcSpanLess a -> TcM ()) -> a -> TcM ()
wrapLocM_ fn (dL->L loc a) = setSrcSpan loc (fn a)
getErrsVar :: TcRn (TcRef Messages)
getErrsVar = do { env <- getLclEnv; return (tcl_errs env) }
setErrsVar :: TcRef Messages -> TcRn a -> TcRn a
setErrsVar v = updLclEnv (\ env -> env { tcl_errs = v })
addErr :: MsgDoc -> TcRn ()
addErr msg = do { loc <- getSrcSpanM; addErrAt loc msg }
failWith :: MsgDoc -> TcRn a
failWith msg = addErr msg >> failM
failAt :: SrcSpan -> MsgDoc -> TcRn a
failAt loc msg = addErrAt loc msg >> failM
addErrAt :: SrcSpan -> MsgDoc -> TcRn ()
addErrAt loc msg = do { ctxt <- getErrCtxt
; tidy_env <- tcInitTidyEnv
; err_info <- mkErrInfo tidy_env ctxt
; addLongErrAt loc msg err_info }
addErrs :: [(SrcSpan,MsgDoc)] -> TcRn ()
addErrs msgs = mapM_ add msgs
where
add (loc,msg) = addErrAt loc msg
checkErr :: Bool -> MsgDoc -> TcRn ()
checkErr ok msg = unless ok (addErr msg)
addMessages :: Messages -> TcRn ()
addMessages msgs1
= do { errs_var <- getErrsVar ;
msgs0 <- readTcRef errs_var ;
writeTcRef errs_var (unionMessages msgs0 msgs1) }
discardWarnings :: TcRn a -> TcRn a
discardWarnings thing_inside
= do { errs_var <- getErrsVar
; (old_warns, _) <- readTcRef errs_var
; result <- thing_inside
; (_new_warns, new_errs) <- readTcRef errs_var
; writeTcRef errs_var (old_warns, new_errs)
; return result }
mkLongErrAt :: SrcSpan -> MsgDoc -> MsgDoc -> TcRn ErrMsg
mkLongErrAt loc msg extra
= do { dflags <- getDynFlags ;
printer <- getPrintUnqualified dflags ;
return $ mkLongErrMsg dflags loc printer msg extra }
mkErrDocAt :: SrcSpan -> ErrDoc -> TcRn ErrMsg
mkErrDocAt loc errDoc
= do { dflags <- getDynFlags ;
printer <- getPrintUnqualified dflags ;
return $ mkErrDoc dflags loc printer errDoc }
addLongErrAt :: SrcSpan -> MsgDoc -> MsgDoc -> TcRn ()
addLongErrAt loc msg extra = mkLongErrAt loc msg extra >>= reportError
reportErrors :: [ErrMsg] -> TcM ()
reportErrors = mapM_ reportError
reportError :: ErrMsg -> TcRn ()
reportError err
= do { traceTc "Adding error:" (pprLocErrMsg err) ;
errs_var <- getErrsVar ;
(warns, errs) <- readTcRef errs_var ;
writeTcRef errs_var (warns, errs `snocBag` err) }
reportWarning :: WarnReason -> ErrMsg -> TcRn ()
reportWarning reason err
= do { let warn = makeIntoWarning reason err
; traceTc "Adding warning:" (pprLocErrMsg warn)
; errs_var <- getErrsVar
; (warns, errs) <- readTcRef errs_var
; writeTcRef errs_var (warns `snocBag` warn, errs) }
checkNoErrs :: TcM r -> TcM r
checkNoErrs main
= do { (res, no_errs) <- askNoErrs main
; unless no_errs failM
; return res }
whenNoErrs :: TcM () -> TcM ()
whenNoErrs thing = ifErrsM (return ()) thing
ifErrsM :: TcRn r -> TcRn r -> TcRn r
ifErrsM bale_out normal
= do { errs_var <- getErrsVar ;
msgs <- readTcRef errs_var ;
dflags <- getDynFlags ;
if errorsFound dflags msgs then
bale_out
else
normal }
failIfErrsM :: TcRn ()
failIfErrsM = ifErrsM failM (return ())
getErrCtxt :: TcM [ErrCtxt]
getErrCtxt = do { env <- getLclEnv; return (tcl_ctxt env) }
setErrCtxt :: [ErrCtxt] -> TcM a -> TcM a
setErrCtxt ctxt = updLclEnv (\ env -> env { tcl_ctxt = ctxt })
addErrCtxt :: MsgDoc -> TcM a -> TcM a
addErrCtxt msg = addErrCtxtM (\env -> return (env, msg))
addErrCtxtM :: (TidyEnv -> TcM (TidyEnv, MsgDoc)) -> TcM a -> TcM a
addErrCtxtM ctxt = updCtxt (\ ctxts -> (False, ctxt) : ctxts)
addLandmarkErrCtxt :: MsgDoc -> TcM a -> TcM a
addLandmarkErrCtxt msg = addLandmarkErrCtxtM (\env -> return (env, msg))
addLandmarkErrCtxtM :: (TidyEnv -> TcM (TidyEnv, MsgDoc)) -> TcM a -> TcM a
addLandmarkErrCtxtM ctxt = updCtxt (\ctxts -> (True, ctxt) : ctxts)
updCtxt :: ([ErrCtxt] -> [ErrCtxt]) -> TcM a -> TcM a
updCtxt upd = updLclEnv (\ env@(TcLclEnv { tcl_ctxt = ctxt }) ->
env { tcl_ctxt = upd ctxt })
popErrCtxt :: TcM a -> TcM a
popErrCtxt = updCtxt (\ msgs -> case msgs of { [] -> []; (_ : ms) -> ms })
getCtLocM :: CtOrigin -> Maybe TypeOrKind -> TcM CtLoc
getCtLocM origin t_or_k
= do { env <- getLclEnv
; return (CtLoc { ctl_origin = origin
, ctl_env = env
, ctl_t_or_k = t_or_k
, ctl_depth = initialSubGoalDepth }) }
setCtLocM :: CtLoc -> TcM a -> TcM a
setCtLocM (CtLoc { ctl_env = lcl }) thing_inside
= updLclEnv (\env -> env { tcl_loc = tcl_loc lcl
, tcl_bndrs = tcl_bndrs lcl
, tcl_ctxt = tcl_ctxt lcl })
thing_inside
tcTryM :: TcRn r -> TcRn (Maybe r)
tcTryM thing_inside
= do { either_res <- tryM thing_inside
; return (case either_res of
Left _ -> Nothing
Right r -> Just r) }
capture_constraints :: TcM r -> TcM (r, WantedConstraints)
capture_constraints thing_inside
= do { lie_var <- newTcRef emptyWC
; res <- updLclEnv (\ env -> env { tcl_lie = lie_var }) $
thing_inside
; lie <- readTcRef lie_var
; return (res, lie) }
capture_messages :: TcM r -> TcM (r, Messages)
capture_messages thing_inside
= do { msg_var <- newTcRef emptyMessages
; res <- setErrsVar msg_var thing_inside
; msgs <- readTcRef msg_var
; return (res, msgs) }
askNoErrs :: TcRn a -> TcRn (a, Bool)
askNoErrs thing_inside
= do { ((mb_res, lie), msgs) <- capture_messages $
capture_constraints $
tcTryM thing_inside
; addMessages msgs
; case mb_res of
Nothing -> do { emitConstraints (insolublesOnly lie)
; failM }
Just res -> do { emitConstraints lie
; dflags <- getDynFlags
; let errs_found = errorsFound dflags msgs
|| insolubleWC lie
; return (res, not errs_found) } }
tryCaptureConstraints :: TcM a -> TcM (Maybe a, WantedConstraints)
tryCaptureConstraints thing_inside
= do { (mb_res, lie) <- capture_constraints $
tcTryM thing_inside
; let lie_to_keep = case mb_res of
Nothing -> insolublesOnly lie
Just {} -> lie
; return (mb_res, lie_to_keep) }
captureConstraints :: TcM a -> TcM (a, WantedConstraints)
captureConstraints thing_inside
= do { (mb_res, lie) <- tryCaptureConstraints thing_inside
; case mb_res of
Nothing -> do { emitConstraints lie; failM }
Just res -> return (res, lie) }
attemptM :: TcRn r -> TcRn (Maybe r)
attemptM thing_inside
= do { (mb_r, lie) <- tryCaptureConstraints thing_inside
; emitConstraints lie
; when (isNothing mb_r) $
traceTc "attemptM recovering with insoluble constraints" $
(ppr lie)
; return mb_r }
recoverM :: TcRn r
-> TcRn r
-> TcRn r
recoverM recover thing
= do { mb_res <- attemptM thing ;
case mb_res of
Nothing -> recover
Just res -> return res }
mapAndRecoverM :: (a -> TcRn b) -> [a] -> TcRn [b]
mapAndRecoverM f xs
= do { mb_rs <- mapM (attemptM . f) xs
; return [r | Just r <- mb_rs] }
mapAndReportM :: (a -> TcRn b) -> [a] -> TcRn [b]
mapAndReportM f xs
= do { mb_rs <- mapM (attemptM . f) xs
; when (any isNothing mb_rs) failM
; return [r | Just r <- mb_rs] }
foldAndRecoverM :: (b -> a -> TcRn b) -> b -> [a] -> TcRn b
foldAndRecoverM _ acc [] = return acc
foldAndRecoverM f acc (x:xs) =
do { mb_r <- attemptM (f acc x)
; case mb_r of
Nothing -> foldAndRecoverM f acc xs
Just acc' -> foldAndRecoverM f acc' xs }
tryTc :: TcRn a -> TcRn (Maybe a, Messages)
tryTc thing_inside
= capture_messages (attemptM thing_inside)
discardErrs :: TcRn a -> TcRn a
discardErrs m
= do { errs_var <- newTcRef emptyMessages
; setErrsVar errs_var m }
tryTcDiscardingErrs :: TcM r -> TcM r -> TcM r
tryTcDiscardingErrs recover thing_inside
= do { ((mb_res, lie), msgs) <- capture_messages $
capture_constraints $
tcTryM thing_inside
; dflags <- getDynFlags
; case mb_res of
Just res | not (errorsFound dflags msgs)
, not (insolubleWC lie)
->
do { addMessages msgs
; emitConstraints lie
; return res }
_ ->
recover
}
addErrTc :: MsgDoc -> TcM ()
addErrTc err_msg = do { env0 <- tcInitTidyEnv
; addErrTcM (env0, err_msg) }
addErrsTc :: [MsgDoc] -> TcM ()
addErrsTc err_msgs = mapM_ addErrTc err_msgs
addErrTcM :: (TidyEnv, MsgDoc) -> TcM ()
addErrTcM (tidy_env, err_msg)
= do { ctxt <- getErrCtxt ;
loc <- getSrcSpanM ;
add_err_tcm tidy_env err_msg loc ctxt }
mkErrTcM :: (TidyEnv, MsgDoc) -> TcM ErrMsg
mkErrTcM (tidy_env, err_msg)
= do { ctxt <- getErrCtxt ;
loc <- getSrcSpanM ;
err_info <- mkErrInfo tidy_env ctxt ;
mkLongErrAt loc err_msg err_info }
mkErrTc :: MsgDoc -> TcM ErrMsg
mkErrTc msg = do { env0 <- tcInitTidyEnv
; mkErrTcM (env0, msg) }
failWithTc :: MsgDoc -> TcM a
failWithTc err_msg
= addErrTc err_msg >> failM
failWithTcM :: (TidyEnv, MsgDoc) -> TcM a
failWithTcM local_and_msg
= addErrTcM local_and_msg >> failM
checkTc :: Bool -> MsgDoc -> TcM ()
checkTc True _ = return ()
checkTc False err = failWithTc err
checkTcM :: Bool -> (TidyEnv, MsgDoc) -> TcM ()
checkTcM True _ = return ()
checkTcM False err = failWithTcM err
failIfTc :: Bool -> MsgDoc -> TcM ()
failIfTc False _ = return ()
failIfTc True err = failWithTc err
failIfTcM :: Bool -> (TidyEnv, MsgDoc) -> TcM ()
failIfTcM False _ = return ()
failIfTcM True err = failWithTcM err
warnIfFlag :: WarningFlag -> Bool -> MsgDoc -> TcRn ()
warnIfFlag warn_flag is_bad msg
= do { warn_on <- woptM warn_flag
; when (warn_on && is_bad) $
addWarn (Reason warn_flag) msg }
warnIf :: Bool -> MsgDoc -> TcRn ()
warnIf is_bad msg
= when is_bad (addWarn NoReason msg)
warnTc :: WarnReason -> Bool -> MsgDoc -> TcM ()
warnTc reason warn_if_true warn_msg
| warn_if_true = addWarnTc reason warn_msg
| otherwise = return ()
warnTcM :: WarnReason -> Bool -> (TidyEnv, MsgDoc) -> TcM ()
warnTcM reason warn_if_true warn_msg
| warn_if_true = addWarnTcM reason warn_msg
| otherwise = return ()
addWarnTc :: WarnReason -> MsgDoc -> TcM ()
addWarnTc reason msg
= do { env0 <- tcInitTidyEnv ;
addWarnTcM reason (env0, msg) }
addWarnTcM :: WarnReason -> (TidyEnv, MsgDoc) -> TcM ()
addWarnTcM reason (env0, msg)
= do { ctxt <- getErrCtxt ;
err_info <- mkErrInfo env0 ctxt ;
add_warn reason msg err_info }
addWarn :: WarnReason -> MsgDoc -> TcRn ()
addWarn reason msg = add_warn reason msg Outputable.empty
addWarnAt :: WarnReason -> SrcSpan -> MsgDoc -> TcRn ()
addWarnAt reason loc msg = add_warn_at reason loc msg Outputable.empty
add_warn :: WarnReason -> MsgDoc -> MsgDoc -> TcRn ()
add_warn reason msg extra_info
= do { loc <- getSrcSpanM
; add_warn_at reason loc msg extra_info }
add_warn_at :: WarnReason -> SrcSpan -> MsgDoc -> MsgDoc -> TcRn ()
add_warn_at reason loc msg extra_info
= do { dflags <- getDynFlags ;
printer <- getPrintUnqualified dflags ;
let { warn = mkLongWarnMsg dflags loc printer
msg extra_info } ;
reportWarning reason warn }
add_err_tcm :: TidyEnv -> MsgDoc -> SrcSpan
-> [ErrCtxt]
-> TcM ()
add_err_tcm tidy_env err_msg loc ctxt
= do { err_info <- mkErrInfo tidy_env ctxt ;
addLongErrAt loc err_msg err_info }
mkErrInfo :: TidyEnv -> [ErrCtxt] -> TcM SDoc
mkErrInfo env ctxts
= go False 0 env ctxts
where
go :: Bool -> Int -> TidyEnv -> [ErrCtxt] -> TcM SDoc
go _ _ _ [] = return empty
go dbg n env ((is_landmark, ctxt) : ctxts)
| is_landmark || n < mAX_CONTEXTS
= do { (env', msg) <- ctxt env
; let n' = if is_landmark then n else n+1
; rest <- go dbg n' env' ctxts
; return (msg $$ rest) }
| otherwise
= go dbg n env ctxts
mAX_CONTEXTS :: Int
mAX_CONTEXTS = 3
debugTc :: TcM () -> TcM ()
debugTc thing
| debugIsOn = thing
| otherwise = return ()
addTopEvBinds :: Bag EvBind -> TcM a -> TcM a
addTopEvBinds new_ev_binds thing_inside
=updGblEnv upd_env thing_inside
where
upd_env tcg_env = tcg_env { tcg_ev_binds = tcg_ev_binds tcg_env
`unionBags` new_ev_binds }
newTcEvBinds :: TcM EvBindsVar
newTcEvBinds = do { binds_ref <- newTcRef emptyEvBindMap
; tcvs_ref <- newTcRef emptyVarSet
; uniq <- newUnique
; traceTc "newTcEvBinds" (text "unique =" <+> ppr uniq)
; return (EvBindsVar { ebv_binds = binds_ref
, ebv_tcvs = tcvs_ref
, ebv_uniq = uniq }) }
newNoTcEvBinds :: TcM EvBindsVar
newNoTcEvBinds
= do { tcvs_ref <- newTcRef emptyVarSet
; uniq <- newUnique
; traceTc "newNoTcEvBinds" (text "unique =" <+> ppr uniq)
; return (CoEvBindsVar { ebv_tcvs = tcvs_ref
, ebv_uniq = uniq }) }
cloneEvBindsVar :: EvBindsVar -> TcM EvBindsVar
cloneEvBindsVar ebv@(EvBindsVar {})
= do { binds_ref <- newTcRef emptyEvBindMap
; tcvs_ref <- newTcRef emptyVarSet
; return (ebv { ebv_binds = binds_ref
, ebv_tcvs = tcvs_ref }) }
cloneEvBindsVar ebv@(CoEvBindsVar {})
= do { tcvs_ref <- newTcRef emptyVarSet
; return (ebv { ebv_tcvs = tcvs_ref }) }
getTcEvTyCoVars :: EvBindsVar -> TcM TyCoVarSet
getTcEvTyCoVars ev_binds_var
= readTcRef (ebv_tcvs ev_binds_var)
getTcEvBindsMap :: EvBindsVar -> TcM EvBindMap
getTcEvBindsMap (EvBindsVar { ebv_binds = ev_ref })
= readTcRef ev_ref
getTcEvBindsMap (CoEvBindsVar {})
= return emptyEvBindMap
setTcEvBindsMap :: EvBindsVar -> EvBindMap -> TcM ()
setTcEvBindsMap (EvBindsVar { ebv_binds = ev_ref }) binds
= writeTcRef ev_ref binds
setTcEvBindsMap v@(CoEvBindsVar {}) ev_binds
| isEmptyEvBindMap ev_binds
= return ()
| otherwise
= pprPanic "setTcEvBindsMap" (ppr v $$ ppr ev_binds)
addTcEvBind :: EvBindsVar -> EvBind -> TcM ()
addTcEvBind (EvBindsVar { ebv_binds = ev_ref, ebv_uniq = u }) ev_bind
= do { traceTc "addTcEvBind" $ ppr u $$
ppr ev_bind
; bnds <- readTcRef ev_ref
; writeTcRef ev_ref (extendEvBinds bnds ev_bind) }
addTcEvBind (CoEvBindsVar { ebv_uniq = u }) ev_bind
= pprPanic "addTcEvBind CoEvBindsVar" (ppr ev_bind $$ ppr u)
chooseUniqueOccTc :: (OccSet -> OccName) -> TcM OccName
chooseUniqueOccTc fn =
do { env <- getGblEnv
; let dfun_n_var = tcg_dfun_n env
; set <- readTcRef dfun_n_var
; let occ = fn set
; 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 })
emitStaticConstraints :: WantedConstraints -> TcM ()
emitStaticConstraints static_lie
= do { gbl_env <- getGblEnv
; updTcRef (tcg_static_wc gbl_env) (`andWC` static_lie) }
emitConstraints :: WantedConstraints -> TcM ()
emitConstraints ct
| isEmptyWC ct
= return ()
| otherwise
= do { lie_var <- getConstraintVar ;
updTcRef lie_var (`andWC` ct) }
emitSimple :: Ct -> TcM ()
emitSimple ct
= do { lie_var <- getConstraintVar ;
updTcRef lie_var (`addSimples` unitBag ct) }
emitSimples :: Cts -> TcM ()
emitSimples cts
= do { lie_var <- getConstraintVar ;
updTcRef lie_var (`addSimples` cts) }
emitImplication :: Implication -> TcM ()
emitImplication ct
= do { lie_var <- getConstraintVar ;
updTcRef lie_var (`addImplics` unitBag ct) }
emitImplications :: Bag Implication -> TcM ()
emitImplications ct
= unless (isEmptyBag ct) $
do { lie_var <- getConstraintVar ;
updTcRef lie_var (`addImplics` ct) }
emitInsoluble :: Ct -> TcM ()
emitInsoluble ct
= do { traceTc "emitInsoluble" (ppr ct)
; lie_var <- getConstraintVar
; updTcRef lie_var (`addInsols` unitBag ct) }
emitInsolubles :: Cts -> TcM ()
emitInsolubles cts
| isEmptyBag cts = return ()
| otherwise = do { traceTc "emitInsolubles" (ppr cts)
; lie_var <- getConstraintVar
; updTcRef lie_var (`addInsols` cts) }
discardConstraints :: TcM a -> TcM a
discardConstraints thing_inside = fst <$> captureConstraints thing_inside
pushLevelAndCaptureConstraints :: TcM a -> TcM (TcLevel, WantedConstraints, a)
pushLevelAndCaptureConstraints thing_inside
= do { env <- getLclEnv
; let tclvl' = pushTcLevel (tcl_tclvl env)
; traceTc "pushLevelAndCaptureConstraints {" (ppr tclvl')
; (res, lie) <- setLclEnv (env { tcl_tclvl = tclvl' }) $
captureConstraints thing_inside
; traceTc "pushLevelAndCaptureConstraints }" (ppr tclvl')
; return (tclvl', lie, res) }
pushTcLevelM_ :: TcM a -> TcM a
pushTcLevelM_ x = updLclEnv (\ env -> env { tcl_tclvl = pushTcLevel (tcl_tclvl env) }) x
pushTcLevelM :: TcM a -> TcM (TcLevel, a)
pushTcLevelM thing_inside
= do { env <- getLclEnv
; let tclvl' = pushTcLevel (tcl_tclvl env)
; res <- setLclEnv (env { tcl_tclvl = tclvl' })
thing_inside
; return (tclvl', res) }
pushTcLevelsM :: Int -> TcM a -> TcM (a, TcLevel)
pushTcLevelsM num_levels thing_inside
= do { env <- getLclEnv
; let tclvl' = nTimes num_levels pushTcLevel (tcl_tclvl env)
; res <- setLclEnv (env { tcl_tclvl = tclvl' }) $
thing_inside
; return (res, tclvl') }
getTcLevel :: TcM TcLevel
getTcLevel = do { env <- getLclEnv
; return (tcl_tclvl env) }
setTcLevel :: TcLevel -> TcM a -> TcM a
setTcLevel tclvl thing_inside
= updLclEnv (\env -> env { tcl_tclvl = tclvl }) thing_inside
isTouchableTcM :: TcTyVar -> TcM Bool
isTouchableTcM tv
= do { lvl <- getTcLevel
; return (isTouchableMetaTyVar lvl tv) }
getLclTypeEnv :: TcM TcTypeEnv
getLclTypeEnv = do { env <- getLclEnv; return (tcl_env env) }
setLclTypeEnv :: TcLclEnv -> TcM a -> TcM a
setLclTypeEnv lcl_env thing_inside
= updLclEnv upd thing_inside
where
upd env = env { tcl_env = tcl_env lcl_env }
traceTcConstraints :: String -> TcM ()
traceTcConstraints msg
= do { lie_var <- getConstraintVar
; lie <- readTcRef lie_var
; traceOptTcRn Opt_D_dump_tc_trace $
hang (text (msg ++ ": LIE:")) 2 (ppr lie)
}
emitAnonWildCardHoleConstraint :: TcTyVar -> TcM ()
emitAnonWildCardHoleConstraint tv
= do { ct_loc <- getCtLocM HoleOrigin Nothing
; emitInsolubles $ unitBag $
CHoleCan { cc_ev = CtDerived { ctev_pred = mkTyVarTy tv
, ctev_loc = ct_loc }
, cc_hole = TypeHole (mkTyVarOcc "_") } }
emitNamedWildCardHoleConstraints :: [(Name, TcTyVar)] -> TcM ()
emitNamedWildCardHoleConstraints wcs
= do { ct_loc <- getCtLocM HoleOrigin Nothing
; emitInsolubles $ listToBag $
map (do_one ct_loc) wcs }
where
do_one :: CtLoc -> (Name, TcTyVar) -> Ct
do_one ct_loc (name, tv)
= CHoleCan { cc_ev = CtDerived { ctev_pred = mkTyVarTy tv
, ctev_loc = ct_loc' }
, cc_hole = TypeHole (occName name) }
where
real_span = case nameSrcSpan name of
RealSrcSpan span -> span
UnhelpfulSpan str -> pprPanic "emitNamedWildCardHoleConstraints"
(ppr name <+> quotes (ftext str))
ct_loc' = setCtLocSpan ct_loc real_span
recordThUse :: TcM ()
recordThUse = do { env <- getGblEnv; writeTcRef (tcg_th_used env) True }
recordThSpliceUse :: TcM ()
recordThSpliceUse = do { env <- getGblEnv; writeTcRef (tcg_th_splice_used env) True }
recordTopLevelSpliceLoc :: SrcSpan -> TcM ()
recordTopLevelSpliceLoc (RealSrcSpan real_loc)
= do { env <- getGblEnv
; let locs_var = tcg_th_top_level_locs env
; locs0 <- readTcRef locs_var
; writeTcRef locs_var (Set.insert real_loc locs0) }
recordTopLevelSpliceLoc (UnhelpfulSpan _) = return ()
getTopLevelSpliceLocs :: TcM (Set RealSrcSpan)
getTopLevelSpliceLocs
= do { env <- getGblEnv
; readTcRef (tcg_th_top_level_locs env) }
keepAlive :: Name -> TcRn ()
keepAlive name
= do { env <- getGblEnv
; traceRn "keep alive" (ppr name)
; updTcRef (tcg_keep env) (`extendNameSet` name) }
getStage :: TcM ThStage
getStage = do { env <- getLclEnv; return (tcl_th_ctxt env) }
getStageAndBindLevel :: Name -> TcRn (Maybe (TopLevelFlag, ThLevel, ThStage))
getStageAndBindLevel name
= do { env <- getLclEnv;
; case lookupNameEnv (tcl_th_bndrs env) name of
Nothing -> return Nothing
Just (top_lvl, bind_lvl) -> return (Just (top_lvl, bind_lvl, tcl_th_ctxt env)) }
setStage :: ThStage -> TcM a -> TcRn a
setStage s = updLclEnv (\ env -> env { tcl_th_ctxt = s })
addModFinalizersWithLclEnv :: ThModFinalizers -> TcM ()
addModFinalizersWithLclEnv mod_finalizers
= do lcl_env <- getLclEnv
th_modfinalizers_var <- fmap tcg_th_modfinalizers getGblEnv
updTcRef th_modfinalizers_var $ \fins ->
(lcl_env, mod_finalizers) : fins
recordUnsafeInfer :: WarningMessages -> TcM ()
recordUnsafeInfer warns =
getGblEnv >>= \env -> writeTcRef (tcg_safeInfer env) (False, warns)
finalSafeMode :: DynFlags -> TcGblEnv -> IO SafeHaskellMode
finalSafeMode dflags tcg_env = do
safeInf <- fst <$> readIORef (tcg_safeInfer tcg_env)
return $ case safeHaskell dflags of
Sf_None | safeInferOn dflags && safeInf -> Sf_SafeInferred
| otherwise -> Sf_None
s -> s
fixSafeInstances :: SafeHaskellMode -> [ClsInst] -> [ClsInst]
fixSafeInstances sfMode | sfMode /= Sf_Safe && sfMode /= Sf_SafeInferred = id
fixSafeInstances _ = map fixSafe
where fixSafe inst = let new_flag = (is_flag inst) { isSafeOverlap = True }
in inst { is_flag = new_flag }
getLocalRdrEnv :: RnM LocalRdrEnv
getLocalRdrEnv = do { env <- getLclEnv; return (tcl_rdr env) }
setLocalRdrEnv :: LocalRdrEnv -> RnM a -> RnM a
setLocalRdrEnv rdr_env thing_inside
= updLclEnv (\env -> env {tcl_rdr = rdr_env}) thing_inside
mkIfLclEnv :: Module -> SDoc -> Bool -> IfLclEnv
mkIfLclEnv mod loc boot
= IfLclEnv { if_mod = mod,
if_loc = loc,
if_boot = boot,
if_nsubst = Nothing,
if_implicits_env = Nothing,
if_tv_env = emptyFsEnv,
if_id_env = emptyFsEnv }
initIfaceTcRn :: IfG a -> TcRn a
initIfaceTcRn thing_inside
= do { tcg_env <- getGblEnv
; dflags <- getDynFlags
; let !mod = tcg_semantic_mod tcg_env
is_instantiate = unitIdIsDefinite (thisPackage dflags) &&
not (null (thisUnitIdInsts dflags))
; let { if_env = IfGblEnv {
if_doc = text "initIfaceTcRn",
if_rec_types =
if is_instantiate
then Nothing
else Just (mod, get_type_env)
}
; get_type_env = readTcRef (tcg_type_env_var tcg_env) }
; setEnvs (if_env, ()) thing_inside }
initIfaceLoad :: HscEnv -> IfG a -> IO a
initIfaceLoad hsc_env do_this
= do let gbl_env = IfGblEnv {
if_doc = text "initIfaceLoad",
if_rec_types = Nothing
}
initTcRnIf 'i' hsc_env gbl_env () do_this
initIfaceCheck :: SDoc -> HscEnv -> IfG a -> IO a
initIfaceCheck doc hsc_env do_this
= do let rec_types = case hsc_type_env_var hsc_env of
Just (mod,var) -> Just (mod, readTcRef var)
Nothing -> Nothing
gbl_env = IfGblEnv {
if_doc = text "initIfaceCheck" <+> doc,
if_rec_types = rec_types
}
initTcRnIf 'i' hsc_env gbl_env () do_this
initIfaceLcl :: Module -> SDoc -> Bool -> IfL a -> IfM lcl a
initIfaceLcl mod loc_doc hi_boot_file thing_inside
= setLclEnv (mkIfLclEnv mod loc_doc hi_boot_file) thing_inside
initIfaceLclWithSubst :: Module -> SDoc -> Bool -> NameShape -> IfL a -> IfM lcl a
initIfaceLclWithSubst mod loc_doc hi_boot_file nsubst thing_inside
= setLclEnv ((mkIfLclEnv mod loc_doc hi_boot_file) { if_nsubst = Just nsubst }) thing_inside
getIfModule :: IfL Module
getIfModule = do { env <- getLclEnv; return (if_mod env) }
failIfM :: MsgDoc -> IfL a
failIfM msg
= do { env <- getLclEnv
; let full_msg = (if_loc env <> colon) $$ nest 2 msg
; dflags <- getDynFlags
; liftIO (putLogMsg dflags NoReason SevFatal
noSrcSpan (defaultErrStyle dflags) full_msg)
; failM }
forkM_maybe :: SDoc -> IfL a -> IfL (Maybe a)
forkM_maybe doc thing_inside
= do {
; unsafeInterleaveM $ uninterruptibleMaskM_ $
do { traceIf (text "Starting fork {" <+> doc)
; mb_res <- tryM $
updLclEnv (\env -> env { if_loc = if_loc env $$ doc }) $
thing_inside
; case mb_res of
Right r -> do { traceIf (text "} ending fork" <+> doc)
; return (Just r) }
Left exn -> do {
whenDOptM Opt_D_dump_if_trace $ do
dflags <- getDynFlags
let msg = hang (text "forkM failed:" <+> doc)
2 (text (show exn))
liftIO $ putLogMsg dflags
NoReason
SevFatal
noSrcSpan
(defaultErrStyle dflags)
msg
; traceIf (text "} ending fork (badly)" <+> doc)
; return Nothing }
}}
forkM :: SDoc -> IfL a -> IfL a
forkM doc thing_inside
= do { mb_res <- forkM_maybe doc thing_inside
; return (case mb_res of
Nothing -> pgmError "Cannot continue after interface file error"
Just r -> r) }
setImplicitEnvM :: TypeEnv -> IfL a -> IfL a
setImplicitEnvM tenv m = updLclEnv (\lcl -> lcl
{ if_implicits_env = Just tenv }) m
class ContainsCostCentreState e where
extractCostCentreState :: e -> TcRef CostCentreState
instance ContainsCostCentreState TcGblEnv where
extractCostCentreState = tcg_cc_st
instance ContainsCostCentreState DsGblEnv where
extractCostCentreState = ds_cc_st
getCCIndexM :: (ContainsCostCentreState gbl)
=> FastString -> TcRnIf gbl lcl CostCentreIndex
getCCIndexM nm = do
env <- getGblEnv
let cc_st_ref = extractCostCentreState env
cc_st <- readTcRef cc_st_ref
let (idx, cc_st') = getCCIndex nm cc_st
writeTcRef cc_st_ref cc_st'
return idx