abandon, abandonAll,
getResumeContext,
getHistorySpan,
+ getModBreaks,
+ getHistoryModule,
back, forward,
setContext, getContext,
nameSetToGlobalRdrEnv,
isModuleInterpreted,
compileExpr, dynCompileExpr,
lookupName,
- obtainTerm, obtainTerm1
+ Term(..), obtainTerm, obtainTerm1, obtainTermB, reconstructType,
+ skolemiseSubst, skolemiseTy
#endif
) where
import Linker
import DynFlags
import Unique
+import UniqSupply
import Module
import Panic
-import UniqFM
+import LazyUniqFM
import Maybes
import ErrUtils
import Util
import SrcLoc
import BreakArray
import RtClosureInspect
-import Packages
import BasicTypes
import Outputable
+import FastString
import Data.Dynamic
+import Data.List (find)
import Control.Monad
import Foreign
+import Foreign.C
import GHC.Exts
import Data.Array
import Control.Exception as Exception
import Control.Concurrent
+import Data.List (sortBy)
import Data.IORef
import Foreign.StablePtr
= RunOk [Name] -- ^ names bound by this evaluation
| RunFailed -- ^ statement failed compilation
| RunException Exception -- ^ statement raised an exception
- | RunBreak ThreadId [Name] BreakInfo
+ | RunBreak ThreadId [Name] (Maybe BreakInfo)
data Status
- = Break HValue BreakInfo ThreadId
- -- ^ the computation hit a breakpoint
+ = Break Bool HValue BreakInfo ThreadId
+ -- ^ the computation hit a breakpoint (Bool <=> was an exception)
| Complete (Either Exception [HValue])
-- ^ the computation completed with either an exception or a value
resumeFinalIds :: [Id], -- [Id] to bind on completion
resumeApStack :: HValue, -- The object from which we can get
-- value of the free variables.
- resumeBreakInfo :: BreakInfo, -- the breakpoint we stopped at.
+ resumeBreakInfo :: Maybe BreakInfo,
+ -- the breakpoint we stopped at
+ -- (Nothing <=> exception)
resumeSpan :: SrcSpan, -- just a cache, otherwise it's a pain
-- to fetch the ModDetails & ModBreaks
-- to get this.
| SingleStep
| RunAndLogSteps
+isStep :: SingleStep -> Bool
isStep RunToCompletion = False
isStep _ = True
data History
= History {
historyApStack :: HValue,
- historyBreakInfo :: BreakInfo
+ historyBreakInfo :: BreakInfo,
+ historyEnclosingDecl :: Id
+ -- ^^ A cache of the enclosing top level declaration, for convenience
}
-getHistorySpan :: Session -> History -> IO SrcSpan
-getHistorySpan s hist = withSession s $ \hsc_env -> do
- let inf = historyBreakInfo hist
+mkHistory :: HscEnv -> HValue -> BreakInfo -> History
+mkHistory hsc_env hval bi = let
+ h = History hval bi decl
+ decl = findEnclosingDecl hsc_env (getHistoryModule h)
+ (getHistorySpan hsc_env h)
+ in h
+
+getHistoryModule :: History -> Module
+getHistoryModule = breakInfo_module . historyBreakInfo
+
+getHistorySpan :: HscEnv -> History -> SrcSpan
+getHistorySpan hsc_env hist =
+ let inf = historyBreakInfo hist
num = breakInfo_number inf
- case lookupUFM (hsc_HPT hsc_env) (moduleName (breakInfo_module inf)) of
- Just hmi -> return (modBreaks_locs (md_modBreaks (hm_details hmi)) ! num)
+ in case lookupUFM (hsc_HPT hsc_env) (moduleName (breakInfo_module inf)) of
+ Just hmi -> modBreaks_locs (getModBreaks hmi) ! num
_ -> panic "getHistorySpan"
-{-
- [Main.hs:42:(1,0)-(3,52)] *Main> :history 2
- Foo.hs:1:3-5
- Bar.hs:5:23-48
- [Main.hs:42:(1,0)-(3,52)] *Main> :back
- Logged breakpoint at Foo.hs:1:3-5
- x :: Int
- y :: a
- _result :: [Char]
- [-1: Foo.hs:1:3-5] *Main> :back
- Logged breakpoint at Bar.hs:5:23-48
- z :: a
- _result :: Float
- [-2: Bar.hs:5:23-48] *Main> :forward
- Logged breakpoint at Foo.hs:1:3-5
- x :: Int
- y :: a
- _result :: [Char]
- [-1: Foo.hs:1:3-5] *Main> :cont
- .. continues
--}
+getModBreaks :: HomeModInfo -> ModBreaks
+getModBreaks hmi
+ | Just linkable <- hm_linkable hmi,
+ [BCOs _ modBreaks] <- linkableUnlinked linkable
+ = modBreaks
+ | otherwise
+ = emptyModBreaks -- probably object code
+
+{- | Finds the enclosing top level function name -}
+-- ToDo: a better way to do this would be to keep hold of the decl_path computed
+-- by the coverage pass, which gives the list of lexically-enclosing bindings
+-- for each tick.
+findEnclosingDecl :: HscEnv -> Module -> SrcSpan -> Id
+findEnclosingDecl hsc_env mod span =
+ case lookupUFM (hsc_HPT hsc_env) (moduleName mod) of
+ Nothing -> panic "findEnclosingDecl"
+ Just hmi -> let
+ globals = typeEnvIds (md_types (hm_details hmi))
+ Just decl =
+ find (\id -> let n = idName id in
+ nameSrcSpan n < span && isExternalName n)
+ (reverse$ sortBy (compare `on` (nameSrcSpan.idName))
+ globals)
+ in decl
-- | Run a statement in the current interactive context. Statement
-- may bind multple values.
Nothing -> return RunFailed
Just (ids, hval) -> do
- when (isStep step) $ setStepFlag
-
- -- set the onBreakAction to be performed when we hit a
- -- breakpoint this is visible in the Byte Code
- -- Interpreter, thus it is a global variable,
- -- implemented with stable pointers
- withBreakAction breakMVar statusMVar $ do
-
- let thing_to_run = unsafeCoerce# hval :: IO [HValue]
- status <- sandboxIO statusMVar thing_to_run
-
+ status <-
+ withBreakAction (isStep step) dflags' breakMVar statusMVar $ do
+ let thing_to_run = unsafeCoerce# hval :: IO [HValue]
+ sandboxIO dflags' statusMVar thing_to_run
+
let ic = hsc_IC hsc_env
bindings = (ic_tmp_ids ic, ic_tyvars ic)
handleRunStatus expr ref bindings ids
breakMVar statusMVar status emptyHistory
-
+emptyHistory :: BoundedList History
emptyHistory = nilBL 50 -- keep a log of length 50
+handleRunStatus :: String -> IORef HscEnv -> ([Id], TyVarSet) -> [Id]
+ -> MVar () -> MVar Status -> Status -> BoundedList History
+ -> IO RunResult
handleRunStatus expr ref bindings final_ids breakMVar statusMVar status
history =
case status of
-- did we hit a breakpoint or did we complete?
- (Break apStack info tid) -> do
+ (Break is_exception apStack info tid) -> do
hsc_env <- readIORef ref
- (hsc_env1, names, span) <- bindLocalsAtBreakpoint hsc_env apStack info
+ let mb_info | is_exception = Nothing
+ | otherwise = Just info
+ (hsc_env1, names, span) <- bindLocalsAtBreakpoint hsc_env
+ apStack mb_info
let
resume = Resume expr tid breakMVar statusMVar
- bindings final_ids apStack info span
+ bindings final_ids apStack mb_info span
(toListBL history) 0
hsc_env2 = pushResume hsc_env1 resume
--
writeIORef ref hsc_env2
- return (RunBreak tid names info)
+ return (RunBreak tid names mb_info)
(Complete either_hvals) ->
case either_hvals of
Left e -> return (RunException e)
final_ids emptyVarSet
-- the bound Ids never have any free TyVars
final_names = map idName final_ids
- writeIORef ref hsc_env{hsc_IC=final_ic}
Linker.extendLinkEnv (zip final_names hvals)
+ hsc_env' <- rttiEnvironment hsc_env{hsc_IC=final_ic}
+ writeIORef ref hsc_env'
return (RunOk final_names)
-
+traceRunStatus :: String -> IORef HscEnv -> ([Id], TyVarSet) -> [Id]
+ -> MVar () -> MVar Status -> Status -> BoundedList History
+ -> IO RunResult
traceRunStatus expr ref bindings final_ids
breakMVar statusMVar status history = do
hsc_env <- readIORef ref
case status of
-- when tracing, if we hit a breakpoint that is not explicitly
-- enabled, then we just log the event in the history and continue.
- (Break apStack info tid) -> do
+ (Break is_exception apStack info tid) | not is_exception -> do
b <- isBreakEnabled hsc_env info
if b
then handle_normally
else do
- let history' = consBL (History apStack info) history
+ let history' = mkHistory hsc_env apStack info `consBL` history
-- probably better make history strict here, otherwise
-- our BoundedList will be pointless.
evaluate history'
- setStepFlag
- status <- withBreakAction breakMVar statusMVar $ do
- withInterruptsSentTo
- (do putMVar breakMVar () -- awaken the stopped thread
- return tid)
- (takeMVar statusMVar) -- and wait for the result
+ status <- withBreakAction True (hsc_dflags hsc_env)
+ breakMVar statusMVar $ do
+ withInterruptsSentTo tid $ do
+ putMVar breakMVar () -- awaken the stopped thread
+ takeMVar statusMVar -- and wait for the result
traceRunStatus expr ref bindings final_ids
breakMVar statusMVar status history'
_other ->
isBreakEnabled hsc_env inf =
case lookupUFM (hsc_HPT hsc_env) (moduleName (breakInfo_module inf)) of
Just hmi -> do
- w <- getBreak (modBreaks_flags (md_modBreaks (hm_details hmi)))
+ w <- getBreak (modBreaks_flags (getModBreaks hmi))
(breakInfo_number inf)
case w of Just n -> return (n /= 0); _other -> return False
_ ->
return False
-foreign import ccall "rts_setStepFlag" setStepFlag :: IO ()
+foreign import ccall "&rts_stop_next_breakpoint" stepFlag :: Ptr CInt
+foreign import ccall "&rts_stop_on_exception" exceptionFlag :: Ptr CInt
+
+setStepFlag :: IO ()
+setStepFlag = poke stepFlag 1
+resetStepFlag :: IO ()
+resetStepFlag = poke stepFlag 0
-- this points to the IO action that is executed when a breakpoint is hit
-foreign import ccall "&breakPointIOAction"
- breakPointIOAction :: Ptr (StablePtr (BreakInfo -> HValue -> IO ()))
+foreign import ccall "&rts_breakpoint_io_action"
+ breakPointIOAction :: Ptr (StablePtr (Bool -> BreakInfo -> HValue -> IO ()))
-- When running a computation, we redirect ^C exceptions to the running
-- thread. ToDo: we might want a way to continue even if the target
-- thread doesn't die when it receives the exception... "this thread
-- is not responding".
-sandboxIO :: MVar Status -> IO [HValue] -> IO Status
-sandboxIO statusMVar thing =
- withInterruptsSentTo
- (forkIO (do res <- Exception.try thing
- putMVar statusMVar (Complete res)))
- (takeMVar statusMVar)
-
-withInterruptsSentTo :: IO ThreadId -> IO r -> IO r
-withInterruptsSentTo io get_result = do
- ts <- takeMVar interruptTargetThread
- child <- io
- putMVar interruptTargetThread (child:ts)
- get_result `finally` modifyMVar_ interruptTargetThread (return.tail)
-
-withBreakAction breakMVar statusMVar io
+--
+-- Careful here: there may be ^C exceptions flying around, so we start
+-- the new thread blocked (forkIO inherits block from the parent,
+-- #1048), and unblock only while we execute the user's code. We
+-- can't afford to lose the final putMVar, otherwise deadlock
+-- ensues. (#1583, #1922, #1946)
+sandboxIO :: DynFlags -> MVar Status -> IO [HValue] -> IO Status
+sandboxIO dflags statusMVar thing =
+ block $ do -- fork starts blocked
+ id <- forkIO $ do res <- Exception.try (unblock $ rethrow dflags thing)
+ putMVar statusMVar (Complete res) -- empty: can't block
+ withInterruptsSentTo id $ takeMVar statusMVar
+
+
+-- We want to turn ^C into a break when -fbreak-on-exception is on,
+-- but it's an async exception and we only break for sync exceptions.
+-- Idea: if we catch and re-throw it, then the re-throw will trigger
+-- a break. Great - but we don't want to re-throw all exceptions, because
+-- then we'll get a double break for ordinary sync exceptions (you'd have
+-- to :continue twice, which looks strange). So if the exception is
+-- not "Interrupted", we unset the exception flag before throwing.
+--
+rethrow :: DynFlags -> IO a -> IO a
+rethrow dflags io = Exception.catch io $ \e -> do -- NB. not catchDyn
+ case e of
+ -- If -fbreak-on-error, we break unconditionally,
+ -- but with care of not breaking twice
+ _ | dopt Opt_BreakOnError dflags &&
+ not(dopt Opt_BreakOnException dflags)
+ -> poke exceptionFlag 1
+
+ -- If it is an "Interrupted" exception, we allow
+ -- a possible break by way of -fbreak-on-exception
+ DynException d | Just Interrupted <- fromDynamic d
+ -> return ()
+
+ -- In any other case, we don't want to break
+ _ -> poke exceptionFlag 0
+
+ Exception.throwIO e
+
+
+withInterruptsSentTo :: ThreadId -> IO r -> IO r
+withInterruptsSentTo thread get_result = do
+ bracket (modifyMVar_ interruptTargetThread (return . (thread:)))
+ (\_ -> modifyMVar_ interruptTargetThread (\tl -> return $! tail tl))
+ (\_ -> get_result)
+
+-- This function sets up the interpreter for catching breakpoints, and
+-- resets everything when the computation has stopped running. This
+-- is a not-very-good way to ensure that only the interactive
+-- evaluation should generate breakpoints.
+withBreakAction :: Bool -> DynFlags -> MVar () -> MVar Status -> IO a -> IO a
+withBreakAction step dflags breakMVar statusMVar io
= bracket setBreakAction resetBreakAction (\_ -> io)
where
setBreakAction = do
stablePtr <- newStablePtr onBreak
poke breakPointIOAction stablePtr
+ when (dopt Opt_BreakOnException dflags) $ poke exceptionFlag 1
+ when step $ setStepFlag
return stablePtr
+ -- Breaking on exceptions is not enabled by default, since it
+ -- might be a bit surprising. The exception flag is turned off
+ -- as soon as it is hit, or in resetBreakAction below.
- onBreak info apStack = do
+ onBreak is_exception info apStack = do
tid <- myThreadId
- putMVar statusMVar (Break apStack info tid)
+ putMVar statusMVar (Break is_exception apStack info tid)
takeMVar breakMVar
resetBreakAction stablePtr = do
poke breakPointIOAction noBreakStablePtr
+ poke exceptionFlag 0
+ resetStepFlag
freeStablePtr stablePtr
+noBreakStablePtr :: StablePtr (Bool -> BreakInfo -> HValue -> IO ())
noBreakStablePtr = unsafePerformIO $ newStablePtr noBreakAction
-noBreakAction info apStack = putStrLn "*** Ignoring breakpoint"
+
+noBreakAction :: Bool -> BreakInfo -> HValue -> IO ()
+noBreakAction False _ _ = putStrLn "*** Ignoring breakpoint"
+noBreakAction True _ _ = return () -- exception: just continue
resume :: Session -> SingleStep -> IO RunResult
resume (Session ref) step
when (isStep step) $ setStepFlag
case r of
Resume expr tid breakMVar statusMVar bindings
- final_ids apStack info _ _ _ -> do
- withBreakAction breakMVar statusMVar $ do
- status <- withInterruptsSentTo
- (do putMVar breakMVar ()
+ final_ids apStack info _ hist _ -> do
+ withBreakAction (isStep step) (hsc_dflags hsc_env)
+ breakMVar statusMVar $ do
+ status <- withInterruptsSentTo tid $ do
+ putMVar breakMVar ()
-- this awakens the stopped thread...
- return tid)
- (takeMVar statusMVar)
- -- and wait for the result
+ takeMVar statusMVar
+ -- and wait for the result
+ let hist' =
+ case info of
+ Nothing -> fromListBL 50 hist
+ Just i -> mkHistory hsc_env apStack i `consBL`
+ fromListBL 50 hist
case step of
RunAndLogSteps ->
traceRunStatus expr ref bindings final_ids
- breakMVar statusMVar status emptyHistory
+ breakMVar statusMVar status hist'
_other ->
handleRunStatus expr ref bindings final_ids
- breakMVar statusMVar status emptyHistory
-
+ breakMVar statusMVar status hist'
back :: Session -> IO ([Name], Int, SrcSpan)
back = moveHist (+1)
forward :: Session -> IO ([Name], Int, SrcSpan)
forward = moveHist (subtract 1)
+moveHist :: (Int -> Int) -> Session -> IO ([Name], Int, SrcSpan)
moveHist fn (Session ref) = do
hsc_env <- readIORef ref
case ic_resume (hsc_IC hsc_env) of
history = resumeHistory r
new_ix = fn ix
--
- when (new_ix >= length history) $
+ when (new_ix > length history) $
throwDyn (ProgramError "no more logged breakpoints")
when (new_ix < 0) $
throwDyn (ProgramError "already at the beginning of the history")
let
- update_ic apStack info = do
+ update_ic apStack mb_info = do
(hsc_env1, names, span) <- bindLocalsAtBreakpoint hsc_env
- apStack info
+ apStack mb_info
let ic = hsc_IC hsc_env1
r' = r { resumeHistoryIx = new_ix }
ic' = ic { ic_resume = r':rs }
if new_ix == 0
then case r of
Resume { resumeApStack = apStack,
- resumeBreakInfo = info } ->
- update_ic apStack info
+ resumeBreakInfo = mb_info } ->
+ update_ic apStack mb_info
else case history !! (new_ix - 1) of
- History apStack info ->
- update_ic apStack info
+ History apStack info _ ->
+ update_ic apStack (Just info)
-- -----------------------------------------------------------------------------
-- After stopping at a breakpoint, add free variables to the environment
+result_fs :: FastString
+result_fs = FSLIT("_result")
bindLocalsAtBreakpoint
:: HscEnv
-> HValue
- -> BreakInfo
+ -> Maybe BreakInfo
-> IO (HscEnv, [Name], SrcSpan)
-bindLocalsAtBreakpoint hsc_env apStack info = do
+
+-- Nothing case: we stopped when an exception was raised, not at a
+-- breakpoint. We have no location information or local variables to
+-- bind, all we can do is bind a local variable to the exception
+-- value.
+bindLocalsAtBreakpoint hsc_env apStack Nothing = do
+ let exn_fs = FSLIT("_exception")
+ exn_name = mkInternalName (getUnique exn_fs) (mkVarOccFS exn_fs) span
+ e_fs = FSLIT("e")
+ e_name = mkInternalName (getUnique e_fs) (mkTyVarOcc e_fs) span
+ e_tyvar = mkTcTyVar e_name liftedTypeKind (SkolemTv RuntimeUnkSkol)
+ exn_id = Id.mkGlobalId VanillaGlobal exn_name (mkTyVarTy e_tyvar)
+ vanillaIdInfo
+ new_tyvars = unitVarSet e_tyvar
+
+ ictxt0 = hsc_IC hsc_env
+ ictxt1 = extendInteractiveContext ictxt0 [exn_id] new_tyvars
+
+ span = mkGeneralSrcSpan FSLIT("<exception thrown>")
+ --
+ Linker.extendLinkEnv [(exn_name, unsafeCoerce# apStack)]
+ return (hsc_env{ hsc_IC = ictxt1 }, [exn_name], span)
+
+-- Just case: we stopped at a breakpoint, we have information about the location
+-- of the breakpoint and the free variables of the expression.
+bindLocalsAtBreakpoint hsc_env apStack (Just info) = do
let
- mod_name = moduleName (breakInfo_module info)
- mod_details = fmap hm_details (lookupUFM (hsc_HPT hsc_env) mod_name)
- breaks = md_modBreaks (expectJust "handlRunStatus" mod_details)
+ mod_name = moduleName (breakInfo_module info)
+ hmi = expectJust "bindLocalsAtBreakpoint" $
+ lookupUFM (hsc_HPT hsc_env) mod_name
+ breaks = getModBreaks hmi
index = breakInfo_number info
vars = breakInfo_vars info
result_ty = breakInfo_resty info
-- So that we don't fall over in a heap when this happens, just don't
-- bind any free variables instead, and we emit a warning.
mb_hValues <- mapM (getIdValFromApStack apStack) offsets
- let filtered_ids = [ id | (id, Just _) <- zip ids mb_hValues ]
+ let filtered_ids = [ id | (id, Just _hv) <- zip ids mb_hValues ]
when (any isNothing mb_hValues) $
debugTraceMsg (hsc_dflags hsc_env) 1 $
text "Warning: _result has been evaluated, some bindings have been lost"
-- make an Id for _result. We use the Unique of the FastString "_result";
-- we don't care about uniqueness here, because there will only be one
-- _result in scope at any time.
- let result_fs = FSLIT("_result")
- result_name = mkInternalName (getUnique result_fs)
- (mkVarOccFS result_fs) (srcSpanStart span)
- result_id = Id.mkLocalId result_name result_ty
+ let result_name = mkInternalName (getUnique result_fs)
+ (mkVarOccFS result_fs) span
+ result_id = Id.mkGlobalId VanillaGlobal result_name result_ty
+ vanillaIdInfo
-- for each Id we're about to bind in the local envt:
-- - skolemise the type variables in its type, so they can't
(id_tys, tyvarss) = mapAndUnzip (skolemiseTy.idType) all_ids
(_,tidy_tys) = tidyOpenTypes emptyTidyEnv id_tys
new_tyvars = unionVarSets tyvarss
- final_ids = zipWith setIdType all_ids tidy_tys
-
- let ictxt0 = hsc_IC hsc_env
- ictxt1 = extendInteractiveContext ictxt0 final_ids new_tyvars
-
+ let final_ids = zipWith setIdType all_ids tidy_tys
+ ictxt0 = hsc_IC hsc_env
+ ictxt1 = extendInteractiveContext ictxt0 final_ids new_tyvars
Linker.extendLinkEnv [ (name,hval) | (name, Just hval) <- zip names mb_hValues ]
Linker.extendLinkEnv [(result_name, unsafeCoerce# apStack)]
- return (hsc_env{ hsc_IC = ictxt1 }, result_name:names, span)
+ hsc_env1 <- rttiEnvironment hsc_env{ hsc_IC = ictxt1 }
+ return (hsc_env1, result_name:names, span)
where
mkNewId :: OccName -> Id -> IO Id
mkNewId occ id = do
- let uniq = idUnique id
- loc = nameSrcLoc (idName id)
+ us <- mkSplitUniqSupply 'I'
+ -- we need a fresh Unique for each Id we bind, because the linker
+ -- state is single-threaded and otherwise we'd spam old bindings
+ -- whenever we stop at a breakpoint. The InteractveContext is properly
+ -- saved/restored, but not the linker state. See #1743, test break026.
+ let
+ uniq = uniqFromSupply us
+ loc = nameSrcSpan (idName id)
name = mkInternalName uniq occ loc
ty = idType id
new_id = Id.mkGlobalId VanillaGlobal name ty (idInfo id)
return new_id
+rttiEnvironment :: HscEnv -> IO HscEnv
+rttiEnvironment hsc_env@HscEnv{hsc_IC=ic} = do
+ let InteractiveContext{ic_tmp_ids=tmp_ids} = ic
+ incompletelyTypedIds =
+ [id | id <- tmp_ids
+ , not $ null [v | v <- varSetElems$ tyVarsOfType (idType id)
+ , isSkolemTyVar v]
+ , (occNameFS.nameOccName.idName) id /= result_fs]
+ tys <- reconstructType hsc_env 10 `mapM` incompletelyTypedIds
+ -- map termType `fmap` (obtainTerm hsc_env False `mapM` incompletelyTypedIds)
+
+ let substs = [unifyRTTI ty ty'
+ | (ty, Just ty') <- zip (map idType incompletelyTypedIds) tys]
+ ic' = foldr (flip substInteractiveContext) ic
+ (map skolemiseSubst substs)
+ return hsc_env{hsc_IC=ic'}
+
+skolemiseSubst :: TvSubst -> TvSubst
+skolemiseSubst subst = subst `setTvSubstEnv`
+ mapVarEnv (fst.skolemiseTy) (getTvSubstEnv subst)
+
skolemiseTy :: Type -> (Type, TyVarSet)
skolemiseTy ty = (substTy subst ty, mkVarSet new_tyvars)
where env = mkVarEnv (zip tyvars new_tyvar_tys)
resume = ic_resume ic
case resume of
[] -> return False
- _:rs -> do
+ r:rs -> do
writeIORef ref hsc_env{ hsc_IC = ic { ic_resume = rs } }
+ abandon_ r
return True
abandonAll :: Session -> IO Bool
let ic = hsc_IC hsc_env
resume = ic_resume ic
case resume of
- [] -> return False
- _:rs -> do
+ [] -> return False
+ rs -> do
writeIORef ref hsc_env{ hsc_IC = ic { ic_resume = [] } }
+ mapM_ abandon_ rs
return True
+-- when abandoning a computation we have to
+-- (a) kill the thread with an async exception, so that the
+-- computation itself is stopped, and
+-- (b) fill in the MVar. This step is necessary because any
+-- thunks that were under evaluation will now be updated
+-- with the partial computation, which still ends in takeMVar,
+-- so any attempt to evaluate one of these thunks will block
+-- unless we fill in the MVar.
+-- See test break010.
+abandon_ :: Resume -> IO ()
+abandon_ r = do
+ killThread (resumeThreadId r)
+ putMVar (resumeBreakMVar r) ()
+
-- -----------------------------------------------------------------------------
-- Bounded list, optimised for repeated cons
nilBL :: Int -> BoundedList a
nilBL bound = BL 0 bound [] []
+consBL :: a -> BoundedList a -> BoundedList a
consBL a (BL len bound left right)
| len < bound = BL (len+1) bound (a:left) right
| null right = BL len bound [a] $! tail (reverse left)
| otherwise = BL len bound (a:left) $! tail right
+toListBL :: BoundedList a -> [a]
toListBL (BL _ _ left right) = left ++ reverse right
+fromListBL :: Int -> [a] -> BoundedList a
+fromListBL bound l = BL (length l) bound l []
+
-- lenBL (BL len _ _ _) = len
-- -----------------------------------------------------------------------------
-> [Module] -- entire top level scope of these modules
-> [Module] -- exports only of these modules
-> IO ()
-setContext sess@(Session ref) toplev_mods export_mods = do
+setContext (Session ref) toplev_mods export_mods = do
hsc_env <- readIORef ref
let old_ic = hsc_IC hsc_env
hpt = hsc_HPT hsc_env
nameSetToGlobalRdrEnv :: NameSet -> ModuleName -> GlobalRdrEnv
nameSetToGlobalRdrEnv names mod =
- mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
+ mkGlobalRdrEnv [ GRE { gre_name = name, gre_par = NoParent, gre_prov = vanillaProv mod }
| name <- nameSetToList names ]
vanillaProv :: ModuleName -> Provenance
_not_a_home_module -> return False
-- | Looks up an identifier in the current interactive context (for :info)
+-- Filter the instances by the ones whose tycons (or clases resp)
+-- are in scope (qualified or otherwise). Otherwise we list a whole lot too many!
+-- The exact choice of which ones to show, and which to hide, is a judgement call.
+-- (see Trac #1581)
getInfo :: Session -> Name -> IO (Maybe (TyThing,Fixity,[Instance]))
-getInfo s name = withSession s $ \hsc_env -> tcRnGetInfo hsc_env name
+getInfo s name
+ = withSession s $ \hsc_env ->
+ do { mb_stuff <- tcRnGetInfo hsc_env name
+ ; case mb_stuff of
+ Nothing -> return Nothing
+ Just (thing, fixity, ispecs) -> do
+ { let rdr_env = ic_rn_gbl_env (hsc_IC hsc_env)
+ ; return (Just (thing, fixity, filter (plausible rdr_env) ispecs)) } }
+ where
+ plausible rdr_env ispec -- Dfun involving only names that are in ic_rn_glb_env
+ = all ok $ nameSetToList $ tyClsNamesOfType $ idType $ instanceDFunId ispec
+ where -- A name is ok if it's in the rdr_env,
+ -- whether qualified or not
+ ok n | n == name = True -- The one we looked for in the first place!
+ | isBuiltInSyntax n = True
+ | isExternalName n = any ((== n) . gre_name)
+ (lookupGRE_Name rdr_env n)
+ | otherwise = True
-- | Returns all names in scope in the current interactive context
getNamesInScope :: Session -> IO [Name]
hvals <- (unsafeCoerce# hval) :: IO [HValue]
case (ids,hvals) of
- ([n],[hv]) -> return (Just hv)
+ ([_],[hv]) -> return (Just hv)
_ -> panic "compileExpr"
-- -----------------------------------------------------------------------------
where
obj_linkable = isObjectLinkable (expectJust "showModule" (hm_linkable mod_info))
-obtainTerm1 :: Session -> Bool -> Maybe Type -> a -> IO Term
-obtainTerm1 sess force mb_ty x = withSession sess $ \hsc_env -> cvObtainTerm hsc_env force mb_ty (unsafeCoerce# x)
+----------------------------------------------------------------------------
+-- RTTI primitives
+
+obtainTerm1 :: HscEnv -> Bool -> Maybe Type -> a -> IO Term
+obtainTerm1 hsc_env force mb_ty x =
+ cvObtainTerm hsc_env maxBound force mb_ty (unsafeCoerce# x)
+
+obtainTermB :: HscEnv -> Int -> Bool -> Id -> IO Term
+obtainTermB hsc_env bound force id = do
+ hv <- Linker.getHValue hsc_env (varName id)
+ cvObtainTerm hsc_env bound force (Just$ idType id) hv
-obtainTerm :: Session -> Bool -> Id -> IO (Maybe Term)
-obtainTerm sess force id = withSession sess $ \hsc_env -> do
- mb_v <- Linker.getHValue (varName id)
- case mb_v of
- Just v -> fmap Just$ cvObtainTerm hsc_env force (Just$ idType id) v
- Nothing -> return Nothing
+obtainTerm :: HscEnv -> Bool -> Id -> IO Term
+obtainTerm hsc_env force id = do
+ hv <- Linker.getHValue hsc_env (varName id)
+ cvObtainTerm hsc_env maxBound force (Just$ idType id) hv
+-- Uses RTTI to reconstruct the type of an Id, making it less polymorphic
+reconstructType :: HscEnv -> Int -> Id -> IO (Maybe Type)
+reconstructType hsc_env bound id = do
+ hv <- Linker.getHValue hsc_env (varName id)
+ cvReconstructType hsc_env bound (Just$ idType id) hv
#endif /* GHCI */
projects / ghc-hetmet.git / blobdiff