{-# LANGUAGE GADTs, RecordWildCards, MagicHash, ScopedTypeVariables, CPP,
    UnboxedTuples #-}
{-# OPTIONS_GHC -fno-warn-name-shadowing #-}

-- |
-- Execute GHCi messages.
--
-- For details on Remote GHCi, see Note [Remote GHCi] in
-- compiler/GHC/Runtime/Interpreter.hs.
--
module GHCi.Run
  ( run, redirectInterrupts
  ) where

import Prelude -- See note [Why do we import Prelude here?]
import GHCi.CreateBCO
import GHCi.InfoTable
import GHCi.FFI
import GHCi.Message
import GHCi.ObjLink
import GHCi.RemoteTypes
import GHCi.TH
import GHCi.BreakArray
import GHCi.StaticPtrTable

import Control.Concurrent
import Control.DeepSeq
import Control.Exception
import Control.Monad
import Data.Binary
import Data.Binary.Get
import Data.ByteString (ByteString)
import qualified Data.ByteString.Unsafe as B
import GHC.Exts
import qualified GHC.Exts.Heap as Heap
import GHC.Stack
import Foreign hiding (void)
import Foreign.C
import GHC.Conc.Sync
import GHC.IO hiding ( bracket )
import System.Mem.Weak  ( deRefWeak )
import Unsafe.Coerce

-- -----------------------------------------------------------------------------
-- Implement messages

foreign import ccall "revertCAFs" rts_revertCAFs  :: IO ()
        -- Make it "safe", just in case

run :: Message a -> IO a
run :: forall a. Message a -> IO a
run Message a
m = case Message a
m of
  Message a
InitLinker -> ShouldRetainCAFs -> IO ()
initObjLinker ShouldRetainCAFs
RetainCAFs
  Message a
RtsRevertCAFs -> IO ()
rts_revertCAFs
  LookupSymbol String
str -> forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap forall a. Ptr a -> RemotePtr a
toRemotePtr forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. String -> IO (Maybe (Ptr a))
lookupSymbol String
str
  LookupClosure String
str -> String -> IO (Maybe HValueRef)
lookupClosure String
str
  LoadDLL String
str -> String -> IO (Maybe String)
loadDLL String
str
  LoadArchive String
str -> String -> IO ()
loadArchive String
str
  LoadObj String
str -> String -> IO ()
loadObj String
str
  UnloadObj String
str -> String -> IO ()
unloadObj String
str
  AddLibrarySearchPath String
str -> forall a. Ptr a -> RemotePtr a
toRemotePtr forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> String -> IO (Ptr ())
addLibrarySearchPath String
str
  RemoveLibrarySearchPath RemotePtr ()
ptr -> Ptr () -> IO Bool
removeLibrarySearchPath (forall a. RemotePtr a -> Ptr a
fromRemotePtr RemotePtr ()
ptr)
  Message a
ResolveObjs -> IO Bool
resolveObjs
  FindSystemLibrary String
str -> String -> IO (Maybe String)
findSystemLibrary String
str
  CreateBCOs [ByteString]
bcos -> [ResolvedBCO] -> IO [HValueRef]
createBCOs (forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
concatMap (forall a. Get a -> ByteString -> a
runGet forall t. Binary t => Get t
get) [ByteString]
bcos)
  FreeHValueRefs [HValueRef]
rs -> forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ forall a. RemoteRef a -> IO ()
freeRemoteRef [HValueRef]
rs
  AddSptEntry Fingerprint
fpr HValueRef
r -> forall a. RemoteRef a -> IO a
localRef HValueRef
r forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= Fingerprint -> HValue -> IO ()
sptAddEntry Fingerprint
fpr
  EvalStmt EvalOpts
opts EvalExpr HValueRef
r -> EvalOpts
-> EvalExpr HValueRef -> IO (EvalStatus_ [HValueRef] [HValueRef])
evalStmt EvalOpts
opts EvalExpr HValueRef
r
  ResumeStmt EvalOpts
opts RemoteRef (ResumeContext [HValueRef])
r -> EvalOpts
-> RemoteRef (ResumeContext [HValueRef])
-> IO (EvalStatus_ [HValueRef] [HValueRef])
resumeStmt EvalOpts
opts RemoteRef (ResumeContext [HValueRef])
r
  AbandonStmt RemoteRef (ResumeContext [HValueRef])
r -> RemoteRef (ResumeContext [HValueRef]) -> IO ()
abandonStmt RemoteRef (ResumeContext [HValueRef])
r
  EvalString HValueRef
r -> HValueRef -> IO (EvalResult String)
evalString HValueRef
r
  EvalStringToString HValueRef
r String
s -> HValueRef -> String -> IO (EvalResult String)
evalStringToString HValueRef
r String
s
  EvalIO HValueRef
r -> HValueRef -> IO (EvalResult ())
evalIO HValueRef
r
  MkCostCentres String
mod [(String, String)]
ccs -> String -> [(String, String)] -> IO [RemotePtr CostCentre]
mkCostCentres String
mod [(String, String)]
ccs
  CostCentreStackInfo RemotePtr CostCentreStack
ptr -> Ptr CostCentreStack -> IO [String]
ccsToStrings (forall a. RemotePtr a -> Ptr a
fromRemotePtr RemotePtr CostCentreStack
ptr)
  NewBreakArray Int
sz -> forall a. a -> IO (RemoteRef a)
mkRemoteRef forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< Int -> IO BreakArray
newBreakArray Int
sz
  SetupBreakpoint RemoteRef BreakArray
ref Int
ix Int
cnt -> do
    BreakArray
arr <- forall a. RemoteRef a -> IO a
localRef RemoteRef BreakArray
ref;
    Bool
_ <- BreakArray -> Int -> Int -> IO Bool
setupBreakpoint BreakArray
arr Int
ix Int
cnt
    forall (m :: * -> *) a. Monad m => a -> m a
return ()
  BreakpointStatus RemoteRef BreakArray
ref Int
ix -> do
    BreakArray
arr <- forall a. RemoteRef a -> IO a
localRef RemoteRef BreakArray
ref; Maybe Int
r <- BreakArray -> Int -> IO (Maybe Int)
getBreak BreakArray
arr Int
ix
    case Maybe Int
r of
      Maybe Int
Nothing -> forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False
      Just Int
w -> forall (m :: * -> *) a. Monad m => a -> m a
return (Int
w forall a. Eq a => a -> a -> Bool
== Int
0)
  GetBreakpointVar HValueRef
ref Int
ix -> do
    HValue
aps <- forall a. RemoteRef a -> IO a
localRef HValueRef
ref
    forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM forall a. a -> IO (RemoteRef a)
mkRemoteRef forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< HValue -> Int -> IO (Maybe HValue)
getIdValFromApStack HValue
aps Int
ix
  MallocData ByteString
bs -> ByteString -> IO (RemotePtr ())
mkString ByteString
bs
  MallocStrings [ByteString]
bss -> forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM ByteString -> IO (RemotePtr ())
mkString0 [ByteString]
bss
  PrepFFI FFIConv
conv [FFIType]
args FFIType
res -> forall a. Ptr a -> RemotePtr a
toRemotePtr forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> FFIConv -> [FFIType] -> FFIType -> IO (Ptr C_ffi_cif)
prepForeignCall FFIConv
conv [FFIType]
args FFIType
res
  FreeFFI RemotePtr C_ffi_cif
p -> Ptr C_ffi_cif -> IO ()
freeForeignCallInfo (forall a. RemotePtr a -> Ptr a
fromRemotePtr RemotePtr C_ffi_cif
p)
  MkConInfoTable Bool
tc Int
ptrs Int
nptrs Int
tag Int
ptrtag ByteString
desc ->
    forall a. Ptr a -> RemotePtr a
toRemotePtr forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Bool
-> Int -> Int -> Int -> Int -> ByteString -> IO (Ptr StgInfoTable)
mkConInfoTable Bool
tc Int
ptrs Int
nptrs Int
tag Int
ptrtag ByteString
desc
  Message a
StartTH -> IO (RemoteRef (IORef QState))
startTH
  GetClosure HValueRef
ref -> do
    Closure
clos <- forall a. HasHeapRep a => a -> IO Closure
Heap.getClosureData forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< forall a. RemoteRef a -> IO a
localRef HValueRef
ref
    forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (\(Heap.Box Any
x) -> forall a. a -> IO (RemoteRef a)
mkRemoteRef (Any -> HValue
HValue Any
x)) Closure
clos
  Seq HValueRef
ref -> forall a. RemoteRef a -> IO (EvalStatus_ () ())
doSeq HValueRef
ref
  ResumeSeq RemoteRef (ResumeContext ())
ref -> RemoteRef (ResumeContext ()) -> IO (EvalStatus_ () ())
resumeSeq RemoteRef (ResumeContext ())
ref
  Message a
_other -> forall a. HasCallStack => String -> a
error String
"GHCi.Run.run"

evalStmt :: EvalOpts -> EvalExpr HValueRef -> IO (EvalStatus [HValueRef])
evalStmt :: EvalOpts
-> EvalExpr HValueRef -> IO (EvalStatus_ [HValueRef] [HValueRef])
evalStmt EvalOpts
opts EvalExpr HValueRef
expr = do
  HValue
io <- EvalExpr HValueRef -> IO HValue
mkIO EvalExpr HValueRef
expr
  forall a. EvalOpts -> IO a -> IO (EvalStatus a)
sandboxIO EvalOpts
opts forall a b. (a -> b) -> a -> b
$ do
    [HValue]
rs <- forall a b. a -> b
unsafeCoerce HValue
io :: IO [HValue]
    forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM forall a. a -> IO (RemoteRef a)
mkRemoteRef [HValue]
rs
 where
  mkIO :: EvalExpr HValueRef -> IO HValue
mkIO (EvalThis HValueRef
href) = forall a. RemoteRef a -> IO a
localRef HValueRef
href
  mkIO (EvalApp EvalExpr HValueRef
l EvalExpr HValueRef
r) = do
    HValue
l' <- EvalExpr HValueRef -> IO HValue
mkIO EvalExpr HValueRef
l
    HValue
r' <- EvalExpr HValueRef -> IO HValue
mkIO EvalExpr HValueRef
r
    forall (m :: * -> *) a. Monad m => a -> m a
return ((forall a b. a -> b
unsafeCoerce HValue
l' :: HValue -> HValue) HValue
r')

evalIO :: HValueRef -> IO (EvalResult ())
evalIO :: HValueRef -> IO (EvalResult ())
evalIO HValueRef
r = do
  HValue
io <- forall a. RemoteRef a -> IO a
localRef HValueRef
r
  forall a. IO a -> IO (EvalResult a)
tryEval (forall a b. a -> b
unsafeCoerce HValue
io :: IO ())

evalString :: HValueRef -> IO (EvalResult String)
evalString :: HValueRef -> IO (EvalResult String)
evalString HValueRef
r = do
  HValue
io <- forall a. RemoteRef a -> IO a
localRef HValueRef
r
  forall a. IO a -> IO (EvalResult a)
tryEval forall a b. (a -> b) -> a -> b
$ do
    String
r <- forall a b. a -> b
unsafeCoerce HValue
io :: IO String
    forall a. a -> IO a
evaluate (forall a. NFData a => a -> a
force String
r)

evalStringToString :: HValueRef -> String -> IO (EvalResult String)
evalStringToString :: HValueRef -> String -> IO (EvalResult String)
evalStringToString HValueRef
r String
str = do
  HValue
io <- forall a. RemoteRef a -> IO a
localRef HValueRef
r
  forall a. IO a -> IO (EvalResult a)
tryEval forall a b. (a -> b) -> a -> b
$ do
    String
r <- (forall a b. a -> b
unsafeCoerce HValue
io :: String -> IO String) String
str
    forall a. a -> IO a
evaluate (forall a. NFData a => a -> a
force String
r)

-- | Process the Seq message to force a value.                       #2950
-- If during this processing a breakpoint is hit, return
-- an EvalBreak value in the EvalStatus to the UI process,
-- otherwise return an EvalComplete.
-- The UI process has more and therefore also can show more
-- information about the breakpoint than the current iserv
-- process.
doSeq :: RemoteRef a -> IO (EvalStatus ())
doSeq :: forall a. RemoteRef a -> IO (EvalStatus_ () ())
doSeq RemoteRef a
ref = do
    forall a. EvalOpts -> IO a -> IO (EvalStatus a)
sandboxIO EvalOpts
evalOptsSeq forall a b. (a -> b) -> a -> b
$ do
      ()
_ <- (forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ forall a. a -> IO a
evaluate forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< forall a. RemoteRef a -> IO a
localRef RemoteRef a
ref)
      forall (m :: * -> *) a. Monad m => a -> m a
return ()

-- | Process a ResumeSeq message. Continue the :force processing     #2950
-- after a breakpoint.
resumeSeq :: RemoteRef (ResumeContext ()) -> IO (EvalStatus ())
resumeSeq :: RemoteRef (ResumeContext ()) -> IO (EvalStatus_ () ())
resumeSeq RemoteRef (ResumeContext ())
hvref = do
    ResumeContext{ThreadId
MVar ()
MVar (EvalStatus_ () ())
resumeThreadId :: forall a. ResumeContext a -> ThreadId
resumeStatusMVar :: forall a. ResumeContext a -> MVar (EvalStatus a)
resumeBreakMVar :: forall a. ResumeContext a -> MVar ()
resumeThreadId :: ThreadId
resumeStatusMVar :: MVar (EvalStatus_ () ())
resumeBreakMVar :: MVar ()
..} <- forall a. RemoteRef a -> IO a
localRef RemoteRef (ResumeContext ())
hvref
    forall b a.
EvalOpts -> MVar () -> MVar (EvalStatus b) -> IO a -> IO a
withBreakAction EvalOpts
evalOptsSeq MVar ()
resumeBreakMVar MVar (EvalStatus_ () ())
resumeStatusMVar forall a b. (a -> b) -> a -> b
$
      forall a. IO a -> IO a
mask_ forall a b. (a -> b) -> a -> b
$ do
        forall a. MVar a -> a -> IO ()
putMVar MVar ()
resumeBreakMVar () -- this awakens the stopped thread...
        forall a. ThreadId -> IO a -> IO a
redirectInterrupts ThreadId
resumeThreadId forall a b. (a -> b) -> a -> b
$ forall a. MVar a -> IO a
takeMVar MVar (EvalStatus_ () ())
resumeStatusMVar

evalOptsSeq :: EvalOpts
evalOptsSeq :: EvalOpts
evalOptsSeq = EvalOpts
              { useSandboxThread :: Bool
useSandboxThread = Bool
True
              , singleStep :: Bool
singleStep = Bool
False
              , breakOnException :: Bool
breakOnException = Bool
False
              , breakOnError :: Bool
breakOnError = Bool
False
              }

-- 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".
--
-- Careful here: there may be ^C exceptions flying around, so we start the new
-- thread blocked (forkIO inherits mask 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 :: EvalOpts -> IO a -> IO (EvalStatus a)
sandboxIO :: forall a. EvalOpts -> IO a -> IO (EvalStatus a)
sandboxIO EvalOpts
opts IO a
io = do
  -- We are running in uninterruptibleMask
  MVar ()
breakMVar <- forall a. IO (MVar a)
newEmptyMVar
  MVar (EvalStatus a)
statusMVar <- forall a. IO (MVar a)
newEmptyMVar
  forall b a.
EvalOpts -> MVar () -> MVar (EvalStatus b) -> IO a -> IO a
withBreakAction EvalOpts
opts MVar ()
breakMVar MVar (EvalStatus a)
statusMVar forall a b. (a -> b) -> a -> b
$ do
    let runIt :: IO (EvalStatus a)
runIt = forall a. IO (EvalResult a) -> IO (EvalStatus a)
measureAlloc forall a b. (a -> b) -> a -> b
$ forall a. IO a -> IO (EvalResult a)
tryEval forall a b. (a -> b) -> a -> b
$ forall a. EvalOpts -> IO a -> IO a
rethrow EvalOpts
opts forall a b. (a -> b) -> a -> b
$ forall a. IO a -> IO a
clearCCS IO a
io
    if EvalOpts -> Bool
useSandboxThread EvalOpts
opts
       then do
         ThreadId
tid <- IO () -> IO ThreadId
forkIO forall a b. (a -> b) -> a -> b
$ do forall a. IO a -> IO a
unsafeUnmask IO (EvalStatus a)
runIt forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= forall a. MVar a -> a -> IO ()
putMVar MVar (EvalStatus a)
statusMVar
                                -- empty: can't block
         forall a. ThreadId -> IO a -> IO a
redirectInterrupts ThreadId
tid forall a b. (a -> b) -> a -> b
$ forall a. IO a -> IO a
unsafeUnmask forall a b. (a -> b) -> a -> b
$ forall a. MVar a -> IO a
takeMVar MVar (EvalStatus a)
statusMVar
       else
          -- GLUT on OS X needs to run on the main thread. If you
          -- try to use it from another thread then you just get a
          -- white rectangle rendered. For this, or anything else
          -- with such restrictions, you can turn the GHCi sandbox off
          -- and things will be run in the main thread.
          --
          -- BUT, note that the debugging features (breakpoints,
          -- tracing, etc.) need the expression to be running in a
          -- separate thread, so debugging is only enabled when
          -- using the sandbox.
         IO (EvalStatus a)
runIt

-- 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 :: EvalOpts -> IO a -> IO a
rethrow :: forall a. EvalOpts -> IO a -> IO a
rethrow EvalOpts{Bool
breakOnError :: Bool
breakOnException :: Bool
singleStep :: Bool
useSandboxThread :: Bool
breakOnError :: EvalOpts -> Bool
breakOnException :: EvalOpts -> Bool
singleStep :: EvalOpts -> Bool
useSandboxThread :: EvalOpts -> Bool
..} IO a
io =
  forall e a. Exception e => IO a -> (e -> IO a) -> IO a
catch IO a
io forall a b. (a -> b) -> a -> b
$ \SomeException
se -> do
    -- If -fbreak-on-error, we break unconditionally,
    --  but with care of not breaking twice
    if Bool
breakOnError Bool -> Bool -> Bool
&& Bool -> Bool
not Bool
breakOnException
       then forall a. Storable a => Ptr a -> a -> IO ()
poke Ptr CInt
exceptionFlag CInt
1
       else case forall e. Exception e => SomeException -> Maybe e
fromException SomeException
se of
               -- If it is a "UserInterrupt" exception, we allow
               --  a possible break by way of -fbreak-on-exception
               Just AsyncException
UserInterrupt -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
               -- In any other case, we don't want to break
               Maybe AsyncException
_ -> forall a. Storable a => Ptr a -> a -> IO ()
poke Ptr CInt
exceptionFlag CInt
0
    forall e a. Exception e => e -> IO a
throwIO SomeException
se

--
-- While we're waiting for the sandbox thread to return a result, if
-- the current thread receives an asynchronous exception we re-throw
-- it at the sandbox thread and continue to wait.
--
-- This is for two reasons:
--
--  * So that ^C interrupts runStmt (e.g. in GHCi), allowing the
--    computation to run its exception handlers before returning the
--    exception result to the caller of runStmt.
--
--  * clients of the GHC API can terminate a runStmt in progress
--    without knowing the ThreadId of the sandbox thread (#1381)
--
-- NB. use a weak pointer to the thread, so that the thread can still
-- be considered deadlocked by the RTS and sent a BlockedIndefinitely
-- exception.  A symptom of getting this wrong is that conc033(ghci)
-- will hang.
--
redirectInterrupts :: ThreadId -> IO a -> IO a
redirectInterrupts :: forall a. ThreadId -> IO a -> IO a
redirectInterrupts ThreadId
target IO a
wait = do
  Weak ThreadId
wtid <- ThreadId -> IO (Weak ThreadId)
mkWeakThreadId ThreadId
target
  IO a
wait forall e a. Exception e => IO a -> (e -> IO a) -> IO a
`catch` \SomeException
e -> do
     Maybe ThreadId
m <- forall v. Weak v -> IO (Maybe v)
deRefWeak Weak ThreadId
wtid
     case Maybe ThreadId
m of
       Maybe ThreadId
Nothing -> IO a
wait
       Just ThreadId
target -> do forall e. Exception e => ThreadId -> e -> IO ()
throwTo ThreadId
target (SomeException
e :: SomeException); IO a
wait

measureAlloc :: IO (EvalResult a) -> IO (EvalStatus a)
measureAlloc :: forall a. IO (EvalResult a) -> IO (EvalStatus a)
measureAlloc IO (EvalResult a)
io = do
  Int64 -> IO ()
setAllocationCounter Int64
0                                 -- #16012
  EvalResult a
a <- IO (EvalResult a)
io
  Int64
ctr <- IO Int64
getAllocationCounter
  let allocs :: Word64
allocs = forall a. Num a => a -> a
negate forall a b. (a -> b) -> a -> b
$ forall a b. (Integral a, Num b) => a -> b
fromIntegral Int64
ctr
  forall (m :: * -> *) a. Monad m => a -> m a
return (forall a b. Word64 -> EvalResult a -> EvalStatus_ a b
EvalComplete Word64
allocs EvalResult a
a)

-- Exceptions can't be marshaled because they're dynamically typed, so
-- everything becomes a String.
tryEval :: IO a -> IO (EvalResult a)
tryEval :: forall a. IO a -> IO (EvalResult a)
tryEval IO a
io = do
  Either SomeException a
e <- forall e a. Exception e => IO a -> IO (Either e a)
try IO a
io
  case Either SomeException a
e of
    Left SomeException
ex -> forall (m :: * -> *) a. Monad m => a -> m a
return (forall a. SerializableException -> EvalResult a
EvalException (SomeException -> SerializableException
toSerializableException SomeException
ex))
    Right a
a -> forall (m :: * -> *) a. Monad m => a -> m a
return (forall a. a -> EvalResult a
EvalSuccess a
a)

-- 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 :: EvalOpts -> MVar () -> MVar (EvalStatus b) -> IO a -> IO a
withBreakAction :: forall b a.
EvalOpts -> MVar () -> MVar (EvalStatus b) -> IO a -> IO a
withBreakAction EvalOpts
opts MVar ()
breakMVar MVar (EvalStatus b)
statusMVar IO a
act
 = forall a b c. IO a -> (a -> IO b) -> (a -> IO c) -> IO c
bracket IO (StablePtr BreakpointCallback)
setBreakAction forall {a}. StablePtr a -> IO ()
resetBreakAction (\StablePtr BreakpointCallback
_ -> IO a
act)
 where
   setBreakAction :: IO (StablePtr BreakpointCallback)
setBreakAction = do
     StablePtr BreakpointCallback
stablePtr <- forall a. a -> IO (StablePtr a)
newStablePtr BreakpointCallback
onBreak
     forall a. Storable a => Ptr a -> a -> IO ()
poke Ptr (StablePtr BreakpointCallback)
breakPointIOAction StablePtr BreakpointCallback
stablePtr
     forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (EvalOpts -> Bool
breakOnException EvalOpts
opts) forall a b. (a -> b) -> a -> b
$ forall a. Storable a => Ptr a -> a -> IO ()
poke Ptr CInt
exceptionFlag CInt
1
     forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (EvalOpts -> Bool
singleStep EvalOpts
opts) forall a b. (a -> b) -> a -> b
$ IO ()
setStepFlag
     forall (m :: * -> *) a. Monad m => a -> m a
return StablePtr BreakpointCallback
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 :: BreakpointCallback
   onBreak :: BreakpointCallback
onBreak Int#
ix# Int#
uniq# Bool
is_exception HValue
apStack = do
     ThreadId
tid <- IO ThreadId
myThreadId
     let resume :: ResumeContext b
resume = ResumeContext
           { resumeBreakMVar :: MVar ()
resumeBreakMVar = MVar ()
breakMVar
           , resumeStatusMVar :: MVar (EvalStatus b)
resumeStatusMVar = MVar (EvalStatus b)
statusMVar
           , resumeThreadId :: ThreadId
resumeThreadId = ThreadId
tid }
     RemoteRef (ResumeContext b)
resume_r <- forall a. a -> IO (RemoteRef a)
mkRemoteRef ResumeContext b
resume
     HValueRef
apStack_r <- forall a. a -> IO (RemoteRef a)
mkRemoteRef HValue
apStack
     RemotePtr CostCentreStack
ccs <- forall a. Ptr a -> RemotePtr a
toRemotePtr forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. a -> IO (Ptr CostCentreStack)
getCCSOf HValue
apStack
     forall a. MVar a -> a -> IO ()
putMVar MVar (EvalStatus b)
statusMVar forall a b. (a -> b) -> a -> b
$ forall a b.
Bool
-> HValueRef
-> Int
-> Int
-> RemoteRef (ResumeContext b)
-> RemotePtr CostCentreStack
-> EvalStatus_ a b
EvalBreak Bool
is_exception HValueRef
apStack_r (Int# -> Int
I# Int#
ix#) (Int# -> Int
I# Int#
uniq#) RemoteRef (ResumeContext b)
resume_r RemotePtr CostCentreStack
ccs
     forall a. MVar a -> IO a
takeMVar MVar ()
breakMVar

   resetBreakAction :: StablePtr a -> IO ()
resetBreakAction StablePtr a
stablePtr = do
     forall a. Storable a => Ptr a -> a -> IO ()
poke Ptr (StablePtr BreakpointCallback)
breakPointIOAction StablePtr BreakpointCallback
noBreakStablePtr
     forall a. Storable a => Ptr a -> a -> IO ()
poke Ptr CInt
exceptionFlag CInt
0
     IO ()
resetStepFlag
     forall {a}. StablePtr a -> IO ()
freeStablePtr StablePtr a
stablePtr

resumeStmt
  :: EvalOpts -> RemoteRef (ResumeContext [HValueRef])
  -> IO (EvalStatus [HValueRef])
resumeStmt :: EvalOpts
-> RemoteRef (ResumeContext [HValueRef])
-> IO (EvalStatus_ [HValueRef] [HValueRef])
resumeStmt EvalOpts
opts RemoteRef (ResumeContext [HValueRef])
hvref = do
  ResumeContext{ThreadId
MVar ()
MVar (EvalStatus_ [HValueRef] [HValueRef])
resumeThreadId :: ThreadId
resumeStatusMVar :: MVar (EvalStatus_ [HValueRef] [HValueRef])
resumeBreakMVar :: MVar ()
resumeThreadId :: forall a. ResumeContext a -> ThreadId
resumeStatusMVar :: forall a. ResumeContext a -> MVar (EvalStatus a)
resumeBreakMVar :: forall a. ResumeContext a -> MVar ()
..} <- forall a. RemoteRef a -> IO a
localRef RemoteRef (ResumeContext [HValueRef])
hvref
  forall b a.
EvalOpts -> MVar () -> MVar (EvalStatus b) -> IO a -> IO a
withBreakAction EvalOpts
opts MVar ()
resumeBreakMVar MVar (EvalStatus_ [HValueRef] [HValueRef])
resumeStatusMVar forall a b. (a -> b) -> a -> b
$
    forall a. IO a -> IO a
mask_ forall a b. (a -> b) -> a -> b
$ do
      forall a. MVar a -> a -> IO ()
putMVar MVar ()
resumeBreakMVar () -- this awakens the stopped thread...
      forall a. ThreadId -> IO a -> IO a
redirectInterrupts ThreadId
resumeThreadId forall a b. (a -> b) -> a -> b
$ forall a. MVar a -> IO a
takeMVar MVar (EvalStatus_ [HValueRef] [HValueRef])
resumeStatusMVar

-- 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.
--      (c) wait for the thread to terminate by taking its status MVar.  This
--          step is necessary to prevent race conditions with
--          -fbreak-on-exception (see #5975).
--  See test break010.
abandonStmt :: RemoteRef (ResumeContext [HValueRef]) -> IO ()
abandonStmt :: RemoteRef (ResumeContext [HValueRef]) -> IO ()
abandonStmt RemoteRef (ResumeContext [HValueRef])
hvref = do
  ResumeContext{ThreadId
MVar ()
MVar (EvalStatus_ [HValueRef] [HValueRef])
resumeThreadId :: ThreadId
resumeStatusMVar :: MVar (EvalStatus_ [HValueRef] [HValueRef])
resumeBreakMVar :: MVar ()
resumeThreadId :: forall a. ResumeContext a -> ThreadId
resumeStatusMVar :: forall a. ResumeContext a -> MVar (EvalStatus a)
resumeBreakMVar :: forall a. ResumeContext a -> MVar ()
..} <- forall a. RemoteRef a -> IO a
localRef RemoteRef (ResumeContext [HValueRef])
hvref
  ThreadId -> IO ()
killThread ThreadId
resumeThreadId
  forall a. MVar a -> a -> IO ()
putMVar MVar ()
resumeBreakMVar ()
  EvalStatus_ [HValueRef] [HValueRef]
_ <- forall a. MVar a -> IO a
takeMVar MVar (EvalStatus_ [HValueRef] [HValueRef])
resumeStatusMVar
  forall (m :: * -> *) a. Monad m => a -> m a
return ()

foreign import ccall "&rts_stop_next_breakpoint" stepFlag      :: Ptr CInt
foreign import ccall "&rts_stop_on_exception"    exceptionFlag :: Ptr CInt

setStepFlag :: IO ()
setStepFlag :: IO ()
setStepFlag = forall a. Storable a => Ptr a -> a -> IO ()
poke Ptr CInt
stepFlag CInt
1
resetStepFlag :: IO ()
resetStepFlag :: IO ()
resetStepFlag = forall a. Storable a => Ptr a -> a -> IO ()
poke Ptr CInt
stepFlag CInt
0

type BreakpointCallback
     = Int#    -- the breakpoint index
    -> Int#    -- the module uniq
    -> Bool    -- exception?
    -> HValue  -- the AP_STACK, or exception
    -> IO ()

foreign import ccall "&rts_breakpoint_io_action"
   breakPointIOAction :: Ptr (StablePtr BreakpointCallback)

noBreakStablePtr :: StablePtr BreakpointCallback
noBreakStablePtr :: StablePtr BreakpointCallback
noBreakStablePtr = forall a. IO a -> a
unsafePerformIO forall a b. (a -> b) -> a -> b
$ forall a. a -> IO (StablePtr a)
newStablePtr BreakpointCallback
noBreakAction

noBreakAction :: BreakpointCallback
noBreakAction :: BreakpointCallback
noBreakAction Int#
_ Int#
_ Bool
False HValue
_ = String -> IO ()
putStrLn String
"*** Ignoring breakpoint"
noBreakAction Int#
_ Int#
_ Bool
True  HValue
_ = forall (m :: * -> *) a. Monad m => a -> m a
return () -- exception: just continue

-- Malloc and copy the bytes.  We don't have any way to monitor the
-- lifetime of this memory, so it just leaks.
mkString :: ByteString -> IO (RemotePtr ())
mkString :: ByteString -> IO (RemotePtr ())
mkString ByteString
bs = forall a. ByteString -> (CStringLen -> IO a) -> IO a
B.unsafeUseAsCStringLen ByteString
bs forall a b. (a -> b) -> a -> b
$ \(Ptr CChar
cstr,Int
len) -> do
  Ptr CChar
ptr <- forall a. Int -> IO (Ptr a)
mallocBytes Int
len
  forall a. Ptr a -> Ptr a -> Int -> IO ()
copyBytes Ptr CChar
ptr Ptr CChar
cstr Int
len
  forall (m :: * -> *) a. Monad m => a -> m a
return (forall a b. RemotePtr a -> RemotePtr b
castRemotePtr (forall a. Ptr a -> RemotePtr a
toRemotePtr Ptr CChar
ptr))

mkString0 :: ByteString -> IO (RemotePtr ())
mkString0 :: ByteString -> IO (RemotePtr ())
mkString0 ByteString
bs = forall a. ByteString -> (CStringLen -> IO a) -> IO a
B.unsafeUseAsCStringLen ByteString
bs forall a b. (a -> b) -> a -> b
$ \(Ptr CChar
cstr,Int
len) -> do
  Ptr CChar
ptr <- forall a. Int -> IO (Ptr a)
mallocBytes (Int
lenforall a. Num a => a -> a -> a
+Int
1)
  forall a. Ptr a -> Ptr a -> Int -> IO ()
copyBytes Ptr CChar
ptr Ptr CChar
cstr Int
len
  forall a. Storable a => Ptr a -> Int -> a -> IO ()
pokeElemOff (Ptr CChar
ptr :: Ptr CChar) Int
len CChar
0
  forall (m :: * -> *) a. Monad m => a -> m a
return (forall a b. RemotePtr a -> RemotePtr b
castRemotePtr (forall a. Ptr a -> RemotePtr a
toRemotePtr Ptr CChar
ptr))

mkCostCentres :: String -> [(String,String)] -> IO [RemotePtr CostCentre]
#if defined(PROFILING)
mkCostCentres mod ccs = do
  c_module <- newCString mod
  mapM (mk_one c_module) ccs
 where
  mk_one c_module (decl_path,srcspan) = do
    c_name <- newCString decl_path
    c_srcspan <- newCString srcspan
    toRemotePtr <$> c_mkCostCentre c_name c_module c_srcspan

foreign import ccall unsafe "mkCostCentre"
  c_mkCostCentre :: Ptr CChar -> Ptr CChar -> Ptr CChar -> IO (Ptr CostCentre)
#else
mkCostCentres :: String -> [(String, String)] -> IO [RemotePtr CostCentre]
mkCostCentres String
_ [(String, String)]
_ = forall (m :: * -> *) a. Monad m => a -> m a
return []
#endif

getIdValFromApStack :: HValue -> Int -> IO (Maybe HValue)
getIdValFromApStack :: HValue -> Int -> IO (Maybe HValue)
getIdValFromApStack HValue
apStack (I# Int#
stackDepth) = do
   case forall a b. a -> Int# -> (# Int#, b #)
getApStackVal# HValue
apStack Int#
stackDepth of
        (# Int#
ok, Any
result #) ->
            case Int#
ok of
              Int#
0# -> forall (m :: * -> *) a. Monad m => a -> m a
return forall a. Maybe a
Nothing -- AP_STACK not found
              Int#
_  -> forall (m :: * -> *) a. Monad m => a -> m a
return (forall a. a -> Maybe a
Just (unsafeCoerce# :: forall a b. a -> b
unsafeCoerce# Any
result))