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|
{-# LANGUAGE CPP #-}
-- | Types used by the runtime interpreter
module GHC.Runtime.Interpreter.Types
( Interp(..)
, IServ(..)
, IServInstance(..)
, IServConfig(..)
, IServState(..)
)
where
import GhcPrelude
import GHCi.RemoteTypes
import GHCi.Message ( Pipe )
import UniqFM
import Foreign
import Control.Concurrent
import System.Process ( ProcessHandle, CreateProcess )
-- | Runtime interpreter
data Interp
= ExternalInterp !IServConfig !IServ -- ^ External interpreter
#if defined(HAVE_INTERNAL_INTERPRETER)
| InternalInterp -- ^ Internal interpreter
#endif
-- | External interpreter
--
-- The external interpreter is spawned lazily (on first use) to avoid slowing
-- down sessions that don't require it. The contents of the MVar reflects the
-- state of the interpreter (running or not).
newtype IServ = IServ (MVar IServState)
-- | State of an external interpreter
data IServState
= IServPending -- ^ Not spawned yet
| IServRunning !IServInstance -- ^ Running
-- | Configuration needed to spawn an external interpreter
data IServConfig = IServConfig
{ iservConfProgram :: !String -- ^ External program to run
, iservConfOpts :: ![String] -- ^ Command-line options
, iservConfProfiled :: !Bool -- ^ Use Profiling way
, iservConfDynamic :: !Bool -- ^ Use Dynamic way
, iservConfHook :: !(Maybe (CreateProcess -> IO ProcessHandle)) -- ^ Hook
, iservConfTrace :: IO () -- ^ Trace action executed after spawn
}
-- | External interpreter instance
data IServInstance = IServInstance
{ iservPipe :: !Pipe
, iservProcess :: !ProcessHandle
, iservLookupSymbolCache :: !(UniqFM (Ptr ()))
, iservPendingFrees :: ![HValueRef]
-- ^ Values that need to be freed before the next command is sent.
-- Threads can append values to this list asynchronously (by modifying the
-- IServ state MVar).
}
|
