3 #include "HsVersions.h"
6 import {-#SOURCE#-} Debugger
9 import Panic hiding (showException)
13 import Control.Exception as Exception
16 import Data.Int ( Int64 )
22 import Control.Monad as Monad
25 -----------------------------------------------------------------------------
28 data GHCiState = GHCiState
34 session :: GHC.Session,
35 options :: [GHCiOption],
36 prelude :: GHC.Module,
37 bkptTable :: IORef (BkptTable GHC.Module),
42 = ShowTiming -- show time/allocs after evaluation
43 | ShowType -- show the type of expressions
44 | RevertCAFs -- revert CAFs after every evaluation
47 newtype GHCi a = GHCi { unGHCi :: IORef GHCiState -> IO a }
49 startGHCi :: GHCi a -> GHCiState -> IO a
50 startGHCi g state = do ref <- newIORef state; unGHCi g ref
52 instance Monad GHCi where
53 (GHCi m) >>= k = GHCi $ \s -> m s >>= \a -> unGHCi (k a) s
54 return a = GHCi $ \s -> return a
56 ghciHandleDyn :: Typeable t => (t -> GHCi a) -> GHCi a -> GHCi a
57 ghciHandleDyn h (GHCi m) = GHCi $ \s ->
58 Exception.catchDyn (m s) (\e -> unGHCi (h e) s)
60 getGHCiState = GHCi $ \r -> readIORef r
61 setGHCiState s = GHCi $ \r -> writeIORef r s
64 getSession = getGHCiState >>= return . session
65 getPrelude = getGHCiState >>= return . prelude
67 GLOBAL_VAR(saved_sess, no_saved_sess, GHC.Session)
68 no_saved_sess = error "no saved_ses"
69 saveSession = getSession >>= io . writeIORef saved_sess
70 splatSavedSession = io (writeIORef saved_sess no_saved_sess)
71 restoreSession = readIORef saved_sess
75 io (GHC.getSessionDynFlags s)
76 setDynFlags dflags = do
78 io (GHC.setSessionDynFlags s dflags)
80 isOptionSet :: GHCiOption -> GHCi Bool
82 = do st <- getGHCiState
83 return (opt `elem` options st)
85 setOption :: GHCiOption -> GHCi ()
87 = do st <- getGHCiState
88 setGHCiState (st{ options = opt : filter (/= opt) (options st) })
90 unsetOption :: GHCiOption -> GHCi ()
92 = do st <- getGHCiState
93 setGHCiState (st{ options = filter (/= opt) (options st) })
96 io m = GHCi { unGHCi = \s -> m >>= return }
98 isTopLevel :: GHCi Bool
99 isTopLevel = getGHCiState >>= return . topLevel
101 getBkptTable :: GHCi (BkptTable GHC.Module)
102 getBkptTable = do table_ref <- getGHCiState >>= return . bkptTable
103 io$ readIORef table_ref
105 setBkptTable :: BkptTable GHC.Module -> GHCi ()
106 setBkptTable new_table = do
107 table_ref <- getGHCiState >>= return . bkptTable
108 io$ writeIORef table_ref new_table
110 modifyBkptTable :: (BkptTable GHC.Module -> BkptTable GHC.Module) -> GHCi ()
111 modifyBkptTable f = do
113 new_bt <- io . evaluate$ f bt
116 showForUser :: SDoc -> GHCi String
118 session <- getSession
119 unqual <- io (GHC.getPrintUnqual session)
120 return $! showSDocForUser unqual doc
122 -- --------------------------------------------------------------------------
123 -- Inferior Sessions Exceptions (used by the debugger)
125 data InfSessionException =
126 StopChildSession -- A child session requests to be stopped
127 | ChildSessionStopped String -- A child session has stopped
131 -- --------------------------------------------------------------------------
132 -- timing & statistics
134 timeIt :: GHCi a -> GHCi a
136 = do b <- isOptionSet ShowTiming
139 else do allocs1 <- io $ getAllocations
140 time1 <- io $ getCPUTime
142 allocs2 <- io $ getAllocations
143 time2 <- io $ getCPUTime
144 io $ printTimes (fromIntegral (allocs2 - allocs1))
148 foreign import ccall unsafe "getAllocations" getAllocations :: IO Int64
149 -- defined in ghc/rts/Stats.c
151 printTimes :: Integer -> Integer -> IO ()
152 printTimes allocs psecs
153 = do let secs = (fromIntegral psecs / (10^12)) :: Float
154 secs_str = showFFloat (Just 2) secs
156 parens (text (secs_str "") <+> text "secs" <> comma <+>
157 text (show allocs) <+> text "bytes")))
159 -----------------------------------------------------------------------------
166 -- Have to turn off buffering again, because we just
167 -- reverted stdout, stderr & stdin to their defaults.
169 foreign import ccall "revertCAFs" rts_revertCAFs :: IO ()
170 -- Make it "safe", just in case
172 -----------------------------------------------------------------------------
173 -- To flush buffers for the *interpreted* computation we need
174 -- to refer to *its* stdout/stderr handles
176 GLOBAL_VAR(flush_interp, error "no flush_interp", IO ())
177 GLOBAL_VAR(turn_off_buffering, error "no flush_stdout", IO ())
179 command_sequence :: [String] -> String
180 command_sequence = unwords . intersperse "Prelude.>>"
182 no_buffer :: String -> String
183 no_buffer h = unwords ["System.IO.hSetBuffering",
185 "System.IO.NoBuffering"]
188 no_buf_cmd = command_sequence $ map no_buffer ["stdout", "stderr", "stdin"]
190 flush_buffer :: String -> String
191 flush_buffer h = unwords ["System.IO.hFlush", "System.IO." ++ h]
194 flush_cmd = command_sequence [flush_buffer "stdout", flush_buffer "stderr"]
196 initInterpBuffering :: GHC.Session -> IO ()
197 initInterpBuffering session
198 = do maybe_hval <- GHC.compileExpr session no_buf_cmd
201 Just hval -> writeIORef turn_off_buffering (unsafeCoerce# hval :: IO ())
202 other -> panic "interactiveUI:setBuffering"
204 maybe_hval <- GHC.compileExpr session flush_cmd
206 Just hval -> writeIORef flush_interp (unsafeCoerce# hval :: IO ())
207 _ -> panic "interactiveUI:flush"
212 flushInterpBuffers :: GHCi ()
214 = io $ do Monad.join (readIORef flush_interp)
217 turnOffBuffering :: IO ()
219 = do Monad.join (readIORef turn_off_buffering)