X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fghci%2FInteractiveUI.hs;h=42f6b1b535d37efcfc4fda7b9c2409e96272c6b6;hb=6b4e00e082b0f4f2445fabbfacae730576adfa2c;hp=a203d94a9ad36e53ac7bd55cf82681bcc2cf64f0;hpb=0f2e6eef2888467fd16226774dd0fee4a68c4611;p=ghc-hetmet.git

diff --git a/ghc/compiler/ghci/InteractiveUI.hs b/ghc/compiler/ghci/InteractiveUI.hs
index a203d94..42f6b1b 100644
--- a/ghc/compiler/ghci/InteractiveUI.hs
+++ b/ghc/compiler/ghci/InteractiveUI.hs
@@ -1,107 +1,107 @@
-{-# OPTIONS -#include "Linker.h" -#include "SchedAPI.h" #-}
+{-# OPTIONS -#include "Linker.h" #-}
 -----------------------------------------------------------------------------
--- $Id: InteractiveUI.hs,v 1.127 2002/07/02 10:16:35 wolfgang Exp $
+-- $Id: InteractiveUI.hs,v 1.190 2005/02/23 15:38:52 simonmar Exp $
 --
 -- GHC Interactive User Interface
 --
--- (c) The GHC Team 2000
+-- (c) The GHC Team 2004
 --
 -----------------------------------------------------------------------------
 module InteractiveUI ( 
-	interactiveUI,  -- :: CmState -> [FilePath] -> [LibrarySpec] -> IO ()
-	LibrarySpec(..),
+	interactiveUI,  -- :: CmState -> [FilePath] -> IO ()
 	ghciWelcomeMsg
    ) where
 
-#include "../includes/config.h"
 #include "HsVersions.h"
 
-import Packages
-
 import CompManager
-import CmTypes		( Linkable, isObjectLinkable, ModSummary(..) )
-import CmLink		( findModuleLinkable_maybe )
-
-import HscTypes		( TyThing(..), showModMsg, InteractiveContext(..) )
-import HsSyn		( TyClDecl(..), ConDecl(..), Sig(..) )
-import MkIface		( ifaceTyThing )
+import HscTypes		( GhciMode(..) )
+import IfaceSyn		( IfaceDecl(..), IfaceClassOp(..), IfaceConDecls(..),
+			  IfaceConDecl(..), IfaceType,
+		   	  IfaceInst(..), pprIfaceDeclHead, pprParendIfaceType,
+			  pprIfaceForAllPart, pprIfaceType )
+import FunDeps		( pprFundeps )
 import DriverFlags
 import DriverState
-import DriverUtil	( handle, remove_spaces )
-import Linker
-import Finder		( flushPackageCache )
+import DriverUtil	( remove_spaces )
+import Linker		( showLinkerState, linkPackages )
 import Util
-import Id		( isRecordSelector, recordSelectorFieldLabel, 
-			  isDataConWrapId, isDataConId, idName )
-import Class		( className )
-import TyCon		( tyConName, tyConClass_maybe, isPrimTyCon, DataConDetails(..) )
-import FieldLabel	( fieldLabelTyCon )
-import SrcLoc		( isGoodSrcLoc )
-import Module		( moduleName )
-import NameEnv		( nameEnvElts )
-import Name		( Name, isHomePackageName, nameSrcLoc, nameOccName,
-			  NamedThing(..) )
-import OccName		( isSymOcc )
-import BasicTypes	( defaultFixity )
+import Name		( Name, NamedThing(..) )
+import OccName		( OccName, isSymOcc, occNameUserString )
+import BasicTypes	( StrictnessMark(..), defaultFixity, SuccessFlag(..) )
 import Outputable
-import CmdLineOpts	( DynFlag(..), DynFlags(..), getDynFlags, saveDynFlags,
-			  restoreDynFlags, dopt_unset )
-import Panic		( GhcException(..), showGhcException )
+import CmdLineOpts	( DynFlags(..), DynFlag(..), dopt )
+import Panic 		hiding ( showException )
 import Config
+import SrcLoc		( SrcLoc, isGoodSrcLoc )
 
-#ifndef mingw32_TARGET_OS
-import Posix
+#ifndef mingw32_HOST_OS
+import DriverUtil( handle )
+import System.Posix
+#if __GLASGOW_HASKELL__ > 504
+	hiding (getEnv)
+#endif
 #endif
 
-import Exception
-import Dynamic
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
-import Readline 
+#ifdef USE_READLINE
+import Control.Concurrent	( yield )	-- Used in readline loop
+import System.Console.Readline as Readline
 #endif
-import Concurrent
-import IOExts
-import SystemExts
 
-import Numeric
-import List
-import System
-import CPUTime
-import Directory
-import IO
-import Char
-import Monad
+--import SystemExts
 
-import GlaExts		( unsafeCoerce# )
+import Control.Exception as Exception
+import Data.Dynamic
+-- import Control.Concurrent
 
-import Foreign		( nullPtr )
-import CString		( CString, peekCString, withCString )
+import Numeric
+import Data.List
+import Data.Int		( Int64 )
+import System.Cmd
+import System.CPUTime
+import System.Environment
+import System.Exit	( exitWith, ExitCode(..) )
+import System.Directory
+import System.IO
+import System.IO.Error as IO
+import Data.Char
+import Control.Monad as Monad
+import Foreign.StablePtr	( newStablePtr )
+
+import GHC.Exts		( unsafeCoerce# )
+import GHC.IOBase	( IOErrorType(InvalidArgument) )
+
+import Data.IORef	( IORef, newIORef, readIORef, writeIORef )
+
+import System.Posix.Internals ( setNonBlockingFD )
 
 -----------------------------------------------------------------------------
 
-ghciWelcomeMsg = "\ 
-\   ___         ___ _\n\ 
-\  / _ \\ /\\  /\\/ __(_)\n\ 
-\ / /_\\// /_/ / /  | |      GHC Interactive, version " ++ cProjectVersion ++ ", for Haskell 98.\n\ 
-\/ /_\\\\/ __  / /___| |      http://www.haskell.org/ghc/\n\ 
-\\\____/\\/ /_/\\____/|_|      Type :? for help.\n"
+ghciWelcomeMsg =
+ "   ___         ___ _\n"++
+ "  / _ \\ /\\  /\\/ __(_)\n"++
+ " / /_\\// /_/ / /  | |      GHC Interactive, version " ++ cProjectVersion ++ ", for Haskell 98.\n"++
+ "/ /_\\\\/ __  / /___| |      http://www.haskell.org/ghc/\n"++
+ "\\____/\\/ /_/\\____/|_|      Type :? for help.\n"
 
 GLOBAL_VAR(commands, builtin_commands, [(String, String -> GHCi Bool)])
 
 builtin_commands :: [(String, String -> GHCi Bool)]
 builtin_commands = [
-  ("add",	keepGoing addModule),
+  ("add",	keepGoingPaths addModule),
   ("browse",    keepGoing browseCmd),
   ("cd",    	keepGoing changeDirectory),
   ("def",	keepGoing defineMacro),
   ("help",	keepGoing help),
   ("?",		keepGoing help),
   ("info",      keepGoing info),
-  ("load",	keepGoing loadModule),
+  ("load",	keepGoingPaths loadModule),
   ("module",	keepGoing setContext),
   ("reload",	keepGoing reloadModule),
   ("set",	keepGoing setCmd),
   ("show",	keepGoing showCmd),
   ("type",	keepGoing typeOfExpr),
+  ("kind",	keepGoing kindOfType),
   ("unset",	keepGoing unsetOptions),
   ("undef",     keepGoing undefineMacro),
   ("quit",	quit)
@@ -110,102 +110,98 @@ builtin_commands = [
 keepGoing :: (String -> GHCi ()) -> (String -> GHCi Bool)
 keepGoing a str = a str >> return False
 
+keepGoingPaths :: ([FilePath] -> GHCi ()) -> (String -> GHCi Bool)
+keepGoingPaths a str = a (toArgs str) >> return False
+
 shortHelpText = "use :? for help.\n"
 
 -- NOTE: spaces at the end of each line to workaround CPP/string gap bug.
-helpText = "\ 
-\ Commands available from the prompt:\n\ 
-\\n\ 
-\   <stmt>		       evaluate/run <stmt>\n\ 
-\   :add <filename> ...        add module(s) to the current target set\n\ 
-\   :browse [*]<module>	       display the names defined by <module>\n\ 
-\   :cd <dir>		       change directory to <dir>\n\ 
-\   :def <cmd> <expr>          define a command :<cmd>\n\ 
-\   :help, :?		       display this list of commands\n\ 
-\   :info [<name> ...]         display information about the given names\n\ 
-\   :load <filename> ...       load module(s) and their dependents\n\ 
-\   :module [+/-] [*]<mod> ... set the context for expression evaluation\n\ 
-\   :reload		       reload the current module set\n\ 
-\\n\ 
-\   :set <option> ...	       set options\n\ 
-\   :set args <arg> ...	       set the arguments returned by System.getArgs\n\ 
-\   :set prog <progname>       set the value returned by System.getProgName\n\ 
-\\n\ 
-\   :show modules	       show the currently loaded modules\n\ 
-\   :show bindings	       show the current bindings made at the prompt\n\ 
-\\n\ 
-\   :type <expr>	       show the type of <expr>\n\ 
-\   :undef <cmd> 	       undefine user-defined command :<cmd>\n\ 
-\   :unset <option> ...	       unset options\n\ 
-\   :quit		       exit GHCi\n\ 
-\   :!<command>		       run the shell command <command>\n\ 
-\\n\ 
-\ Options for `:set' and `:unset':\n\ 
-\\n\ 
-\    +r			revert top-level expressions after each evaluation\n\ 
-\    +s                 print timing/memory stats after each evaluation\n\ 
-\    +t			print type after evaluation\n\ 
-\    -<flags>		most GHC command line flags can also be set here\n\ 
-\                         (eg. -v2, -fglasgow-exts, etc.)\n\ 
-\"
-
-interactiveUI :: CmState -> [FilePath] -> [LibrarySpec] -> IO ()
-interactiveUI cmstate paths cmdline_libs = do
+helpText =
+ " Commands available from the prompt:\n" ++
+ "\n" ++
+ "   <stmt>                      evaluate/run <stmt>\n" ++
+ "   :add <filename> ...         add module(s) to the current target set\n" ++
+ "   :browse [*]<module>         display the names defined by <module>\n" ++
+ "   :cd <dir>                   change directory to <dir>\n" ++
+ "   :def <cmd> <expr>           define a command :<cmd>\n" ++
+ "   :help, :?                   display this list of commands\n" ++
+ "   :info [<name> ...]          display information about the given names\n" ++
+ "   :load <filename> ...        load module(s) and their dependents\n" ++
+ "   :module [+/-] [*]<mod> ...  set the context for expression evaluation\n" ++
+ "   :reload                     reload the current module set\n" ++
+ "\n" ++
+ "   :set <option> ...           set options\n" ++
+ "   :set args <arg> ...         set the arguments returned by System.getArgs\n" ++
+ "   :set prog <progname>        set the value returned by System.getProgName\n" ++
+ "\n" ++
+ "   :show modules               show the currently loaded modules\n" ++
+ "   :show bindings              show the current bindings made at the prompt\n" ++
+ "\n" ++
+ "   :type <expr>                show the type of <expr>\n" ++
+ "   :kind <type>                show the kind of <type>\n" ++
+ "   :undef <cmd>                undefine user-defined command :<cmd>\n" ++
+ "   :unset <option> ...         unset options\n" ++
+ "   :quit                       exit GHCi\n" ++
+ "   :!<command>                 run the shell command <command>\n" ++
+ "\n" ++
+ " Options for ':set' and ':unset':\n" ++
+ "\n" ++
+ "    +r            revert top-level expressions after each evaluation\n" ++
+ "    +s            print timing/memory stats after each evaluation\n" ++
+ "    +t            print type after evaluation\n" ++
+ "    -<flags>      most GHC command line flags can also be set here\n" ++
+ "                         (eg. -v2, -fglasgow-exts, etc.)\n"
+
+
+interactiveUI :: DynFlags -> [FilePath] -> Maybe String -> IO ()
+interactiveUI dflags srcs maybe_expr = do
+
+   cmstate <- cmInit Interactive dflags;
+
+   -- HACK! If we happen to get into an infinite loop (eg the user
+   -- types 'let x=x in x' at the prompt), then the thread will block
+   -- on a blackhole, and become unreachable during GC.  The GC will
+   -- detect that it is unreachable and send it the NonTermination
+   -- exception.  However, since the thread is unreachable, everything
+   -- it refers to might be finalized, including the standard Handles.
+   -- This sounds like a bug, but we don't have a good solution right
+   -- now.
+   newStablePtr stdin
+   newStablePtr stdout
+   newStablePtr stderr
+
    hFlush stdout
    hSetBuffering stdout NoBuffering
 
-   dflags <- getDynFlags
-
-   -- link in the available packages
-   pkgs <- getPackageInfo
-   initLinker
-   linkPackages dflags cmdline_libs pkgs
-
-   (cmstate, maybe_hval) 
-	<- cmCompileExpr cmstate dflags "IO.hSetBuffering IO.stdout IO.NoBuffering Prelude.>> IO.hSetBuffering IO.stderr IO.NoBuffering"
-   case maybe_hval of
-	Just hval -> unsafeCoerce# hval :: IO ()
-	_ -> panic "interactiveUI:buffering"
-
-   (cmstate, maybe_hval)
-	<- cmCompileExpr cmstate dflags "IO.hFlush IO.stderr"
-   case maybe_hval of
-	Just hval -> writeIORef flush_stderr (unsafeCoerce# hval :: IO ())
-	_ -> panic "interactiveUI:stderr"
-
-   (cmstate, maybe_hval) 
-	<- cmCompileExpr cmstate dflags "IO.hFlush IO.stdout"
-   case maybe_hval of
-	Just hval -> writeIORef flush_stdout (unsafeCoerce# hval :: IO ())
-	_ -> panic "interactiveUI:stdout"
+	-- Initialise buffering for the *interpreted* I/O system
+   initInterpBuffering cmstate
 
 	-- We don't want the cmd line to buffer any input that might be
 	-- intended for the program, so unbuffer stdin.
-   hSetBuffering stdin  NoBuffering
+   hSetBuffering stdin NoBuffering
 
 	-- initial context is just the Prelude
-   cmstate <- cmSetContext cmstate dflags [] ["Prelude"]
+   cmstate <- cmSetContext cmstate [] ["Prelude"]
 
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
    Readline.initialize
 #endif
 
-   startGHCi (runGHCi paths dflags) 
+   startGHCi (runGHCi srcs dflags maybe_expr)
 	GHCiState{ progname = "<interactive>",
 		   args = [],
-		   targets = paths,
+		   targets = srcs,
 		   cmstate = cmstate,
 		   options = [] }
 
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
    Readline.resetTerminal Nothing
 #endif
 
    return ()
 
-
-runGHCi :: [FilePath] -> DynFlags -> GHCi ()
-runGHCi paths dflags = do
+runGHCi :: [FilePath] -> DynFlags -> Maybe String -> GHCi ()
+runGHCi paths dflags maybe_expr = do
   read_dot_files <- io (readIORef v_Read_DotGHCi)
 
   when (read_dot_files) $ do
@@ -237,32 +233,42 @@ runGHCi paths dflags = do
   		  Left e    -> return ()
   		  Right hdl -> fileLoop hdl False
 
-  -- perform a :load for files given on the GHCi command line
+  -- Perform a :load for files given on the GHCi command line
   when (not (null paths)) $
      ghciHandle showException $
-	loadModule (unwords paths)
+	loadModule paths
 
-  -- enter the interactive loop
+  -- if verbosity is greater than 0, or we are connected to a
+  -- terminal, display the prompt in the interactive loop.
   is_tty <- io (hIsTerminalDevice stdin)
-  interactiveLoop is_tty
+  let show_prompt = verbosity dflags > 0 || is_tty
+
+  case maybe_expr of
+	Nothing -> 
+	    -- enter the interactive loop
+	    interactiveLoop is_tty show_prompt
+	Just expr -> do
+	    -- just evaluate the expression we were given
+	    runCommandEval expr
+	    return ()
 
   -- and finally, exit
   io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
 
 
-interactiveLoop is_tty = do
-  -- ignore ^C exceptions caught here
+interactiveLoop is_tty show_prompt = do
+  -- Ignore ^C exceptions caught here
   ghciHandleDyn (\e -> case e of 
-			Interrupted -> ghciUnblock (interactiveLoop is_tty)
+			Interrupted -> ghciUnblock (interactiveLoop is_tty show_prompt)
 			_other      -> return ()) $ do
 
   -- read commands from stdin
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
   if (is_tty) 
 	then readlineLoop
-	else fileLoop stdin False  -- turn off prompt for non-TTY input
+	else fileLoop stdin show_prompt
 #else
-  fileLoop stdin True
+  fileLoop stdin show_prompt
 #endif
 
 
@@ -277,7 +283,7 @@ interactiveLoop is_tty = do
 
 checkPerms :: String -> IO Bool
 checkPerms name =
-#ifdef mingw32_TARGET_OS
+#ifdef mingw32_HOST_OS
   return True
 #else
   DriverUtil.handle (\_ -> return False) $ do
@@ -304,8 +310,14 @@ fileLoop hdl prompt = do
    when prompt (io (putStr (mkPrompt mod imports)))
    l <- io (IO.try (hGetLine hdl))
    case l of
-	Left e | isEOFError e -> return ()
-	       | otherwise    -> throw e
+	Left e | isEOFError e		   -> return ()
+	       | InvalidArgument <- etype  -> return ()
+	       | otherwise		   -> io (ioError e)
+		where etype = ioeGetErrorType e
+		-- treat InvalidArgument in the same way as EOF:
+		-- this can happen if the user closed stdin, or
+		-- perhaps did getContents which closes stdin at
+		-- EOF.
 	Right l -> 
 	  case remove_spaces l of
 	    "" -> fileLoop hdl prompt
@@ -323,13 +335,16 @@ stringLoop (s:ss) = do
 mkPrompt toplevs exports
    = concat (intersperse " " (map ('*':) toplevs ++ exports)) ++ "> "
 
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
 readlineLoop :: GHCi ()
 readlineLoop = do
    cmstate <- getCmState
    (mod,imports) <- io (cmGetContext cmstate)
    io yield
-   l <- io (readline (mkPrompt mod imports))
+   l <- io (readline (mkPrompt mod imports)
+	  	`finally` setNonBlockingFD 0)
+		-- readline sometimes puts stdin into blocking mode,
+		-- so we need to put it back for the IO library
    case l of
 	Nothing -> return ()
 	Just l  ->
@@ -341,16 +356,32 @@ readlineLoop = do
           	  if quit then return () else readlineLoop
 #endif
 
--- Top level exception handler, just prints out the exception 
--- and carries on.
 runCommand :: String -> GHCi Bool
-runCommand c = 
-  ghciHandle ( \exception -> do
-		flushEverything
-		showException exception
-		return False
-	     ) $
-  doCommand c
+runCommand c = ghciHandle handler (doCommand c)
+
+-- This version is for the GHC command-line option -e.  The only difference
+-- from runCommand is that it catches the ExitException exception and
+-- exits, rather than printing out the exception.
+runCommandEval c = ghciHandle handleEval (doCommand c)
+  where 
+    handleEval (ExitException code) = io (exitWith code)
+    handleEval e                    = do showException e
+				         io (exitWith (ExitFailure 1))
+
+-- This is the exception handler for exceptions generated by the
+-- user's code; it normally just prints out the exception.  The
+-- handler must be recursive, in case showing the exception causes
+-- more exceptions to be raised.
+--
+-- Bugfix: if the user closed stdout or stderr, the flushing will fail,
+-- raising another exception.  We therefore don't put the recursive
+-- handler arond the flushing operation, so if stderr is closed
+-- GHCi will just die gracefully rather than going into an infinite loop.
+handler :: Exception -> GHCi Bool
+handler exception = do
+  flushInterpBuffers
+  io installSignalHandlers
+  ghciHandle handler (showException exception >> return False)
 
 showException (DynException dyn) =
   case fromDynamic dyn of
@@ -373,15 +404,14 @@ runStmt stmt
  | null (filter (not.isSpace) stmt) = return []
  | otherwise
  = do st <- getGHCiState
-      dflags <- io getDynFlags
-      let dflags' = dopt_unset dflags Opt_WarnUnusedBinds
+      cmstate <- getCmState
       (new_cmstate, result) <- 
 	io $ withProgName (progname st) $ withArgs (args st) $
-	cmRunStmt (cmstate st) dflags' stmt
+	     cmRunStmt cmstate stmt
       setGHCiState st{cmstate = new_cmstate}
       case result of
 	CmRunFailed      -> return []
-	CmRunException e -> showException e >> return []
+	CmRunException e -> throw e  -- this is caught by runCommand(Eval)
 	CmRunOk names    -> return names
 
 -- possibly print the type and revert CAFs after evaluating an expression
@@ -390,9 +420,10 @@ finishEvalExpr names
       cmstate <- getCmState
       when b (mapM_ (showTypeOfName cmstate) names)
 
+      flushInterpBuffers
+      io installSignalHandlers
       b <- isOptionSet RevertCAFs
       io (when b revertCAFs)
-      flushEverything
       return True
 
 showTypeOfName :: CmState -> Name -> GHCi ()
@@ -402,19 +433,13 @@ showTypeOfName cmstate n
 	  Nothing  -> return ()
 	  Just str -> io (putStrLn (showSDoc (ppr n) ++ " :: " ++ str))
 
-flushEverything :: GHCi ()
-flushEverything
-   = io $ do Monad.join (readIORef flush_stdout)
-     	     Monad.join (readIORef flush_stderr)
-             return ()
-
 specialCommand :: String -> GHCi Bool
 specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
 specialCommand str = do
   let (cmd,rest) = break isSpace str
   cmds <- io (readIORef commands)
   case [ (s,f) | (s,f) <- cmds, prefixMatch cmd s ] of
-     []      -> io (hPutStr stdout ("unknown command `:" ++ cmd ++ "'\n" 
+     []      -> io (hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n" 
 		                    ++ shortHelpText) >> return False)
      [(_,f)] -> f (dropWhile isSpace rest)
      cs      -> io (hPutStrLn stdout ("prefix " ++ cmd ++ 
@@ -422,7 +447,47 @@ specialCommand str = do
 	         	     	       foldr1 (\a b -> a ++ ',':b) (map fst cs)
 					 ++ ")") >> return False)
 
-noArgs c = throwDyn (CmdLineError ("command `" ++ c ++ "' takes no arguments"))
+noArgs c = throwDyn (CmdLineError ("command '" ++ c ++ "' takes no arguments"))
+
+
+-----------------------------------------------------------------------------
+-- To flush buffers for the *interpreted* computation we need
+-- to refer to *its* stdout/stderr handles
+
+GLOBAL_VAR(flush_interp,       error "no flush_interp", IO ())
+GLOBAL_VAR(turn_off_buffering, error "no flush_stdout", IO ())
+
+no_buf_cmd = "System.IO.hSetBuffering System.IO.stdout System.IO.NoBuffering" ++
+	     " Prelude.>> System.IO.hSetBuffering System.IO.stderr System.IO.NoBuffering"
+flush_cmd  = "System.IO.hFlush System.IO.stdout Prelude.>> System.IO.hFlush IO.stderr"
+
+initInterpBuffering :: CmState -> IO ()
+initInterpBuffering cmstate
+ = do maybe_hval <- cmCompileExpr cmstate no_buf_cmd
+	
+      case maybe_hval of
+	Just hval -> writeIORef turn_off_buffering (unsafeCoerce# hval :: IO ())
+	other	  -> panic "interactiveUI:setBuffering"
+	
+      maybe_hval <- cmCompileExpr cmstate flush_cmd
+      case maybe_hval of
+	Just hval -> writeIORef flush_interp (unsafeCoerce# hval :: IO ())
+	_         -> panic "interactiveUI:flush"
+
+      turnOffBuffering	-- Turn it off right now
+
+      return ()
+
+
+flushInterpBuffers :: GHCi ()
+flushInterpBuffers
+ = io $ do Monad.join (readIORef flush_interp)
+           return ()
+
+turnOffBuffering :: IO ()
+turnOffBuffering
+ = do Monad.join (readIORef turn_off_buffering)
+      return ()
 
 -----------------------------------------------------------------------------
 -- Commands
@@ -431,83 +496,162 @@ help :: String -> GHCi ()
 help _ = io (putStr helpText)
 
 info :: String -> GHCi ()
-info "" = throwDyn (CmdLineError "syntax: `:i <thing-you-want-info-about>'")
-info s = do
-  let names = words s
-  init_cms <- getCmState
-  dflags <- io getDynFlags
-  let 
-    infoThings cms [] = return cms
-    infoThings cms (name:names) = do
-      (cms, stuff) <- io (cmInfoThing cms dflags name)
-      io (putStrLn (showSDocForUser unqual (
-	    vcat (intersperse (text "") (map showThing stuff))))
-         )
-      infoThings cms names
-
-    unqual = cmGetPrintUnqual init_cms
-
-    showThing (ty_thing, fixity) 
-	= vcat [ text "-- " <> showTyThing ty_thing, 
-		 showFixity fixity (getName ty_thing),
-	         ppr (ifaceTyThing ty_thing) ]
-
-    showFixity fix name
+info "" = throwDyn (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
+info s  = do { let names = words s
+	     ; init_cms <- getCmState
+	     ; dflags <- getDynFlags
+	     ; let exts = dopt Opt_GlasgowExts dflags
+	     ; mapM_ (infoThing exts init_cms) names }
+  where
+    infoThing exts cms name
+	= do { stuff <- io (cmGetInfo cms name)
+	     ; io (putStrLn (showSDocForUser (cmGetPrintUnqual cms) $
+     		   vcat (intersperse (text "") (map (showThing exts) stuff)))) }
+
+showThing :: Bool -> GetInfoResult -> SDoc
+showThing exts (wanted_str, (thing, fixity, src_loc, insts)) 
+    = vcat [ showWithLoc src_loc (showDecl exts want_name thing),
+	     show_fixity fixity,
+	     vcat (map show_inst insts)]
+  where
+    want_name occ = wanted_str == occNameUserString occ
+
+    show_fixity fix 
 	| fix == defaultFixity = empty
-	| otherwise            = ppr fix <+> 
-				 (if isSymOcc (nameOccName name)
-					then ppr name
-					else char '`' <> ppr name <> char '`')
-
-    showTyThing (AClass cl)
-       = hcat [ppr cl, text " is a class", showSrcLoc (className cl)]
-    showTyThing (ATyCon ty)
-       | isPrimTyCon ty
-       = hcat [ppr ty, text " is a primitive type constructor"]
-       | otherwise
-       = hcat [ppr ty, text " is a type constructor", showSrcLoc (tyConName ty)]
-    showTyThing (AnId   id)
-       = hcat [ppr id, text " is a ", idDescr id, showSrcLoc (idName id)]
-
-    idDescr id
-       | isRecordSelector id = 
-		case tyConClass_maybe (fieldLabelTyCon (
-				recordSelectorFieldLabel id)) of
-			Nothing -> text "record selector"
-			Just c  -> text "method in class " <> ppr c
-       | isDataConWrapId id  = text "data constructor"
-       | otherwise           = text "variable"
-
-	-- also print out the source location for home things
-    showSrcLoc name
-	| isHomePackageName name && isGoodSrcLoc loc
-	= hsep [ text ", defined at", ppr loc ]
+	| otherwise            = ppr fix <+> text wanted_str
+
+    show_inst (iface_inst, loc)
+	= showWithLoc loc (ptext SLIT("instance") <+> ppr (ifInstHead iface_inst))
+
+showWithLoc :: SrcLoc -> SDoc -> SDoc
+showWithLoc loc doc 
+    = hang doc 2 (char '\t' <> show_loc loc)
+		-- The tab tries to make them line up a bit
+  where
+    show_loc loc	-- The ppr function for SrcLocs is a bit wonky
+	| isGoodSrcLoc loc = comment <+> ptext SLIT("Defined at") <+> ppr loc
+	| otherwise	   = comment <+> ppr loc
+    comment = ptext SLIT("--")
+
+
+-- Now there is rather a lot of goop just to print declarations in a
+-- civilised way with "..." for the parts we are less interested in.
+
+showDecl :: Bool -> (OccName -> Bool) -> IfaceDecl -> SDoc
+showDecl exts want_name (IfaceForeign {ifName = tc})
+  = ppr tc <+> ptext SLIT("is a foreign type")
+
+showDecl exts want_name (IfaceId {ifName = var, ifType = ty})
+  = ppr var <+> dcolon <+> showType exts ty 
+
+showDecl exts want_name (IfaceSyn {ifName = tycon, ifTyVars = tyvars, ifSynRhs = mono_ty})
+  = hang (ptext SLIT("type") <+> pprIfaceDeclHead [] tycon tyvars)
+       2 (equals <+> ppr mono_ty)
+
+showDecl exts want_name (IfaceData {ifName = tycon, 
+		     ifTyVars = tyvars, ifCons = condecls})
+  = hang (pp_nd <+> pprIfaceDeclHead context tycon tyvars)
+       2 (add_bars (ppr_trim show_con cs))
+  where
+    show_con (IfVanillaCon { ifConOcc = con_name, ifConInfix = is_infix, ifConArgTys = tys, 
+			     ifConStricts = strs, ifConFields = flds})
+	| want_name tycon || want_name con_name || any want_name flds
+	= Just (show_guts con_name is_infix tys_w_strs flds)
+	| otherwise = Nothing
+	where
+	  tys_w_strs = tys `zip` (strs ++ repeat NotMarkedStrict)
+    show_con (IfGadtCon { ifConOcc = con_name, ifConTyVars = tvs, ifConCtxt = theta, 
+			  ifConArgTys = arg_tys, ifConResTys = res_tys, ifConStricts = strs })
+	| want_name tycon || want_name con_name
+	= Just (ppr_bndr con_name <+> colon <+> pprIfaceForAllPart tvs theta pp_tau)
+	| otherwise = Nothing
+	where
+	  tys_w_strs = arg_tys `zip` (strs ++ repeat NotMarkedStrict)
+	  pp_tau = foldr add pp_res_ty tys_w_strs
+	  pp_res_ty = ppr_bndr tycon <+> hsep (map pprParendIfaceType res_tys)
+	  add bty pp_ty = ppr_bangty bty <+> arrow <+> pp_ty
+
+    show_guts con True [ty1, ty2] flds = sep [ppr_bangty ty1, ppr con, ppr_bangty ty2]
+    show_guts con _ tys []   = ppr_bndr con <+> sep (map ppr_bangty tys)
+    show_guts con _ tys flds 
+	= ppr_bndr con <+> braces (sep (punctuate comma (ppr_trim show_fld (tys `zip` flds))))
+	where
+	  show_fld (bty, fld) | want_name tycon || want_name con || want_name fld
+			      = Just (ppr_bndr fld <+> dcolon <+> ppr_bangty bty)
+			      | otherwise = Nothing
+
+    (pp_nd, context, cs) = case condecls of
+		    IfAbstractTyCon 	      -> (ptext SLIT("data"), [],   [])
+		    IfDataTyCon (Just cxt) cs -> (ptext SLIT("data"), cxt, cs)
+		    IfDataTyCon Nothing cs    -> (ptext SLIT("data"), [],  cs)
+		    IfNewTyCon c    	      -> (ptext SLIT("newtype"), [], [c])
+
+    add_bars []      = empty
+    add_bars [c]     = equals <+> c
+    add_bars (c:cs)  = equals <+> sep (c : map (char '|' <+>) cs)
+
+    ppr_bangty (ty, str) = ppr_str str <> pprParendIfaceType ty
+    ppr_str MarkedStrict    = char '!'
+    ppr_str MarkedUnboxed   = ptext SLIT("!!")
+    ppr_str NotMarkedStrict = empty
+
+showDecl exts want_name (IfaceClass {ifCtxt = context, ifName = clas, ifTyVars = tyvars, 
+		      ifFDs = fds, ifSigs = sigs})
+  = hang (ptext SLIT("class") <+> pprIfaceDeclHead context clas tyvars
+		<+> pprFundeps fds <+> ptext SLIT("where"))
+       2 (vcat (ppr_trim show_op sigs))
+  where
+    show_op (IfaceClassOp op dm ty) 
+	| want_name clas || want_name op 
+	= Just (ppr_bndr op <+> dcolon <+> showType exts ty)
 	| otherwise
-	= empty
-	where loc = nameSrcLoc name
+	= Nothing
 
-  cms <- infoThings init_cms names
-  setCmState cms
-  return ()
+showType :: Bool -> IfaceType -> SDoc
+showType True  ty = pprIfaceType ty -- -fglasgow-exts: print with the foralls
+showType False ty = ppr ty	    -- otherwise, print without the foralls
+
+ppr_trim :: (a -> Maybe SDoc) -> [a] -> [SDoc]
+ppr_trim show xs
+  = snd (foldr go (False, []) xs)
+  where
+    go x (eliding, so_far)
+	| Just doc <- show x = (False, doc : so_far)
+	| otherwise = if eliding then (True, so_far)
+		                 else (True, ptext SLIT("...") : so_far)
+
+ppr_bndr :: OccName -> SDoc
+-- Wrap operators in ()
+ppr_bndr occ | isSymOcc occ = parens (ppr occ)
+	     | otherwise    = ppr occ
+
+
+-----------------------------------------------------------------------------
+-- Commands
 
-addModule :: String -> GHCi ()
-addModule str = do
-  let files = words str
+addModule :: [FilePath] -> GHCi ()
+addModule files = do
   state <- getGHCiState
-  dflags <- io (getDynFlags)
   io (revertCAFs)			-- always revert CAFs on load/add.
+  files <- mapM expandPath files
   let new_targets = files ++ targets state 
-  graph <- io (cmDepAnal (cmstate state) dflags new_targets)
-  (cmstate1, ok, mods) <- io (cmLoadModules (cmstate state) dflags graph)
+  graph <- io (cmDepAnal (cmstate state) new_targets)
+  (cmstate1, ok, mods) <- io (cmLoadModules (cmstate state) graph)
   setGHCiState state{ cmstate = cmstate1, targets = new_targets }
   setContextAfterLoad mods
+  dflags <- getDynFlags
   modulesLoadedMsg ok mods dflags
 
 changeDirectory :: String -> GHCi ()
-changeDirectory ('~':d) = do
-   tilde <- io (getEnv "HOME")	-- will fail if HOME not defined
-   io (setCurrentDirectory (tilde ++ '/':d))
-changeDirectory d = io (setCurrentDirectory d)
+changeDirectory dir = do
+  state    <- getGHCiState
+  when (targets state /= []) $
+	io $ putStr "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed.\n"
+  cmstate1 <- io (cmUnload (cmstate state))
+  setGHCiState state{ cmstate = cmstate1, targets = [] }
+  setContextAfterLoad []
+  dir <- expandPath dir
+  io (setCurrentDirectory dir)
 
 defineMacro :: String -> GHCi ()
 defineMacro s = do
@@ -518,7 +662,7 @@ defineMacro s = do
 	else do
   if (macro_name `elem` map fst cmds) 
 	then throwDyn (CmdLineError 
-		("command `" ++ macro_name ++ "' is already defined"))
+		("command '" ++ macro_name ++ "' is already defined"))
 	else do
 
   -- give the expression a type signature, so we can be sure we're getting
@@ -527,9 +671,7 @@ defineMacro s = do
 
   -- compile the expression
   cms <- getCmState
-  dflags <- io getDynFlags
-  (new_cmstate, maybe_hv) <- io (cmCompileExpr cms dflags new_expr)
-  setCmState new_cmstate
+  maybe_hv <- io (cmCompileExpr cms new_expr)
   case maybe_hv of
      Nothing -> return ()
      Just hv -> io (writeIORef commands --
@@ -545,55 +687,58 @@ undefineMacro macro_name = do
   cmds <- io (readIORef commands)
   if (macro_name `elem` map fst builtin_commands) 
 	then throwDyn (CmdLineError
-		("command `" ++ macro_name ++ "' cannot be undefined"))
+		("command '" ++ macro_name ++ "' cannot be undefined"))
 	else do
   if (macro_name `notElem` map fst cmds) 
 	then throwDyn (CmdLineError 
-		("command `" ++ macro_name ++ "' not defined"))
+		("command '" ++ macro_name ++ "' not defined"))
 	else do
   io (writeIORef commands (filter ((/= macro_name) . fst) cmds))
 
 
-loadModule :: String -> GHCi ()
-loadModule str = timeIt (loadModule' str)
+loadModule :: [FilePath] -> GHCi ()
+loadModule fs = timeIt (loadModule' fs)
 
-loadModule' str = do
-  let files = words str
+loadModule' :: [FilePath] -> GHCi ()
+loadModule' files = do
   state <- getGHCiState
-  dflags <- io getDynFlags
+
+  -- expand tildes
+  files <- mapM expandPath files
 
   -- do the dependency anal first, so that if it fails we don't throw
   -- away the current set of modules.
-  graph <- io (cmDepAnal (cmstate state) dflags files)
+  graph <- io (cmDepAnal (cmstate state) files)
 
   -- Dependency anal ok, now unload everything
-  cmstate1 <- io (cmUnload (cmstate state) dflags)
+  cmstate1 <- io (cmUnload (cmstate state))
   setGHCiState state{ cmstate = cmstate1, targets = [] }
 
   io (revertCAFs)  -- always revert CAFs on load.
-  (cmstate2, ok, mods) <- io (cmLoadModules cmstate1 dflags graph)
+  (cmstate2, ok, mods) <- io (cmLoadModules cmstate1 graph)
   setGHCiState state{ cmstate = cmstate2, targets = files }
 
   setContextAfterLoad mods
+  dflags <- getDynFlags
   modulesLoadedMsg ok mods dflags
 
 
 reloadModule :: String -> GHCi ()
 reloadModule "" = do
   state <- getGHCiState
-  dflags <- io getDynFlags
   case targets state of
    [] -> io (putStr "no current target\n")
    paths -> do
 	-- do the dependency anal first, so that if it fails we don't throw
 	-- away the current set of modules.
-	graph <- io (cmDepAnal (cmstate state) dflags paths)
+	graph <- io (cmDepAnal (cmstate state) paths)
 
 	io (revertCAFs)		-- always revert CAFs on reload.
 	(cmstate1, ok, mods) 
-		<- io (cmLoadModules (cmstate state) dflags graph)
+		<- io (cmLoadModules (cmstate state) graph)
         setGHCiState state{ cmstate=cmstate1 }
 	setContextAfterLoad mods
+	dflags <- getDynFlags
 	modulesLoadedMsg ok mods dflags
 
 reloadModule _ = noArgs ":reload"
@@ -611,18 +756,24 @@ modulesLoadedMsg ok mods dflags =
 	| otherwise = hsep (
 	    punctuate comma (map text mods)) <> text "."
    case ok of
-    False ->
+    Failed ->
        io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
-    True  ->
+    Succeeded  ->
        io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
 
 
 typeOfExpr :: String -> GHCi ()
 typeOfExpr str 
   = do cms <- getCmState
-       dflags <- io getDynFlags
-       (new_cmstate, maybe_tystr) <- io (cmTypeOfExpr cms dflags str)
-       setCmState new_cmstate
+       maybe_tystr <- io (cmTypeOfExpr cms str)
+       case maybe_tystr of
+	  Nothing    -> return ()
+	  Just tystr -> io (putStrLn tystr)
+
+kindOfType :: String -> GHCi ()
+kindOfType str 
+  = do cms <- getCmState
+       maybe_tystr <- io (cmKindOfType cms str)
        case maybe_tystr of
 	  Nothing    -> return ()
 	  Just tystr -> io (putStrLn tystr)
@@ -634,7 +785,7 @@ shellEscape :: String -> GHCi Bool
 shellEscape str = io (system str >> return False)
 
 -----------------------------------------------------------------------------
--- Browing a module's contents
+-- Browsing a module's contents
 
 browseCmd :: String -> GHCi ()
 browseCmd m = 
@@ -645,57 +796,27 @@ browseCmd m =
 
 browseModule m exports_only = do
   cms <- getCmState
-  dflags <- io getDynFlags
 
   is_interpreted <- io (cmModuleIsInterpreted cms m)
   when (not is_interpreted && not exports_only) $
-	throwDyn (CmdLineError ("module `" ++ m ++ "' is not interpreted"))
+	throwDyn (CmdLineError ("module '" ++ m ++ "' is not interpreted"))
 
-  -- temporarily set the context to the module we're interested in,
+  -- Temporarily set the context to the module we're interested in,
   -- just so we can get an appropriate PrintUnqualified
   (as,bs) <- io (cmGetContext cms)
-  cms1 <- io (if exports_only then cmSetContext cms dflags [] [prel,m]
-			      else cmSetContext cms dflags [m] [])
-  cms2 <- io (cmSetContext cms1 dflags as bs)
+  cms1 <- io (if exports_only then cmSetContext cms [] [prel,m]
+			      else cmSetContext cms [m] [])
+  cms2 <- io (cmSetContext cms1 as bs)
 
-  (cms3, things) <- io (cmBrowseModule cms2 dflags m exports_only)
-
-  setCmState cms3
+  things <- io (cmBrowseModule cms2 m exports_only)
 
   let unqual = cmGetPrintUnqual cms1 -- NOTE: cms1 with the new context
 
-      things' = filter wantToSee things
-
-      wantToSee (AnId id) = not (isDataConId id || isDataConWrapId id)
-      wantToSee _ = True
-
-      thing_names = map getName things
-
-      thingDecl thing@(AnId id)  = ifaceTyThing thing
-
-      thingDecl thing@(AClass c) =
-        let rn_decl = ifaceTyThing thing in
-	case rn_decl of
-	  ClassDecl { tcdSigs = cons } -> 
-		rn_decl{ tcdSigs = filter methodIsVisible cons }
-	  other -> other
-        where
-           methodIsVisible (ClassOpSig n _ _ _) = n `elem` thing_names
-
-      thingDecl thing@(ATyCon t) =
-        let rn_decl = ifaceTyThing thing in
-	case rn_decl of
-	  TyData { tcdCons = DataCons cons } -> 
-		rn_decl{ tcdCons = DataCons (filter conIsVisible cons) }
-	  other -> other
-        where
-	  conIsVisible (ConDecl n _ _ _ _ _) = n `elem` thing_names
-
+  dflags <- getDynFlags
+  let exts = dopt Opt_GlasgowExts dflags
   io (putStrLn (showSDocForUser unqual (
-   	 vcat (map (ppr . thingDecl) things')))
-   )
-
-  where
+   	 vcat (map (showDecl exts (const True)) things)
+      )))
 
 -----------------------------------------------------------------------------
 -- Setting the module context
@@ -714,17 +835,16 @@ setContext str
 
 newContext mods = do
   cms <- getCmState
-  dflags <- io getDynFlags
   (as,bs) <- separate cms mods [] []
   let bs' = if null as && prel `notElem` bs then prel:bs else bs
-  cms' <- io (cmSetContext cms dflags as bs')
+  cms' <- io (cmSetContext cms as bs')
   setCmState cms'
 
 separate cmstate []           as bs = return (as,bs)
 separate cmstate (('*':m):ms) as bs = do
    b <- io (cmModuleIsInterpreted cmstate m)
    if b then separate cmstate ms (m:as) bs
-   	else throwDyn (CmdLineError ("module `" ++ m ++ "' is not interpreted"))
+   	else throwDyn (CmdLineError ("module '" ++ m ++ "' is not interpreted"))
 separate cmstate (m:ms)       as bs = separate cmstate ms as (m:bs)
 
 prel = "Prelude"
@@ -732,7 +852,6 @@ prel = "Prelude"
 
 addToContext mods = do
   cms <- getCmState
-  dflags <- io getDynFlags
   (as,bs) <- io (cmGetContext cms)
 
   (as',bs') <- separate cms mods [] []
@@ -740,14 +859,13 @@ addToContext mods = do
   let as_to_add = as' \\ (as ++ bs)
       bs_to_add = bs' \\ (as ++ bs)
 
-  cms' <- io (cmSetContext cms dflags 
+  cms' <- io (cmSetContext cms
 			(as ++ as_to_add) (bs ++ bs_to_add))
   setCmState cms'
 
 
 removeFromContext mods = do
   cms <- getCmState
-  dflags <- io getDynFlags
   (as,bs) <- io (cmGetContext cms)
 
   (as_to_remove,bs_to_remove) <- separate cms mods [] []
@@ -755,7 +873,7 @@ removeFromContext mods = do
   let as' = as \\ (as_to_remove ++ bs_to_remove)
       bs' = bs \\ (as_to_remove ++ bs_to_remove)
 
-  cms' <- io (cmSetContext cms dflags as' bs')
+  cms' <- io (cmSetContext cms as' bs')
   setCmState cms'
 
 ----------------------------------------------------------------------------
@@ -800,21 +918,21 @@ setOptions wds =
       mapM_ setOpt plus_opts
 
       -- now, the GHC flags
-      pkgs_before <- io (readIORef v_Packages)
-      leftovers   <- io (processArgs static_flags minus_opts [])
-      pkgs_after  <- io (readIORef v_Packages)
-
-      -- update things if the users wants more packages
-      when (pkgs_before /= pkgs_after) $
-	 newPackages (pkgs_after \\ pkgs_before)
+      leftovers <- io $ processStaticFlags minus_opts
 
       -- then, dynamic flags
-      io $ do 
-	restoreDynFlags
-        leftovers <- processArgs dynamic_flags leftovers []
-	saveDynFlags
-
-        if (not (null leftovers))
+      dflags <- getDynFlags
+      (dflags',leftovers) <- io $ processDynamicFlags leftovers dflags
+      setDynFlags dflags'
+
+        -- update things if the users wants more packages
+{- TODO:
+        let new_packages = pkgs_after \\ pkgs_before
+        when (not (null new_packages)) $
+  	   newPackages new_packages
+-}
+
+      if (not (null leftovers))
 		then throwDyn (CmdLineError ("unrecognised flags: " ++ 
 						unwords leftovers))
 		else return ()
@@ -828,7 +946,7 @@ unsetOptions str
 	   (plus_opts, rest2)  = partition isPlus rest1
 
        if (not (null rest2)) 
-	  then io (putStrLn ("unknown option: `" ++ head rest2 ++ "'"))
+	  then io (putStrLn ("unknown option: '" ++ head rest2 ++ "'"))
 	  else do
 
        mapM_ unsetOpt plus_opts
@@ -846,12 +964,12 @@ isPlus _ = False
 
 setOpt ('+':str)
   = case strToGHCiOpt str of
-	Nothing -> io (putStrLn ("unknown option: `" ++ str ++ "'"))
+	Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
 	Just o  -> setOption o
 
 unsetOpt ('+':str)
   = case strToGHCiOpt str of
-	Nothing -> io (putStrLn ("unknown option: `" ++ str ++ "'"))
+	Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
 	Just o  -> unsetOption o
 
 strToGHCiOpt :: String -> (Maybe GHCiOption)
@@ -865,51 +983,40 @@ optToStr ShowTiming = "s"
 optToStr ShowType   = "t"
 optToStr RevertCAFs = "r"
 
-newPackages new_pkgs = do
-  state <- getGHCiState
-  dflags <- io getDynFlags
-  cmstate1 <- io (cmUnload (cmstate state) dflags)
+newPackages new_pkgs = do	-- The new packages are already in v_Packages
+  state    <- getGHCiState
+  cmstate1 <- io (cmUnload (cmstate state))
   setGHCiState state{ cmstate = cmstate1, targets = [] }
+  dflags   <- getDynFlags
+  io (linkPackages dflags new_pkgs)
+  setContextAfterLoad []
 
-  io $ do
-    pkgs <- getPackageInfo
-    flushPackageCache pkgs
-   
-    new_pkg_info <- getPackageDetails new_pkgs
-    mapM_ (linkPackage dflags) (reverse new_pkg_info)
-
------------------------------------------------------------------------------
+-- ---------------------------------------------------------------------------
 -- code for `:show'
 
 showCmd str =
   case words str of
 	["modules" ] -> showModules
 	["bindings"] -> showBindings
+	["linker"]   -> io showLinkerState
 	_ -> throwDyn (CmdLineError "syntax:  :show [modules|bindings]")
 
-showModules = do
-  cms <- getCmState
-  let mg = cmGetModuleGraph cms
-      ls = cmGetLinkables   cms
-      maybe_linkables = map (findModuleLinkable_maybe ls) 
-				(map (moduleName.ms_mod) mg)
-  zipWithM showModule mg maybe_linkables
-  return ()
-
-showModule :: ModSummary -> Maybe Linkable -> GHCi ()
-showModule m (Just l) = do
-  io (putStrLn (showModMsg (isObjectLinkable l) (ms_mod m) (ms_location m)))
-showModule _ Nothing = panic "missing linkable"
+showModules
+  = do	{ cms <- getCmState
+	; let show_one ms = io (putStrLn (cmShowModule cms ms))
+	; mapM_ show_one (cmGetModuleGraph cms) }
 
 showBindings = do
   cms <- getCmState
   let
 	unqual = cmGetPrintUnqual cms
-	showBinding b = putStrLn (showSDocForUser unqual (ppr (ifaceTyThing b)))
+--	showBinding b = putStrLn (showSDocForUser unqual (ppr (ifaceTyThing b)))
+	showBinding b = putStrLn (showSDocForUser unqual (ppr (getName b)))
 
   io (mapM_ showBinding (cmGetBindings cms))
   return ()
 
+
 -----------------------------------------------------------------------------
 -- GHCi monad
 
@@ -928,9 +1035,6 @@ data GHCiOption
 	| RevertCAFs		-- revert CAFs after every evaluation
 	deriving Eq
 
-GLOBAL_VAR(flush_stdout, error "no flush_stdout", IO ())
-GLOBAL_VAR(flush_stderr, error "no flush_stdout", IO ())
-
 newtype GHCi a = GHCi { unGHCi :: IORef GHCiState -> IO a }
 
 startGHCi :: GHCi a -> GHCiState -> IO a
@@ -951,6 +1055,10 @@ setGHCiState s = GHCi $ \r -> writeIORef r s
 getCmState = getGHCiState >>= return . cmstate
 setCmState cms = do s <- getGHCiState; setGHCiState s{cmstate=cms}
 
+getDynFlags = getCmState >>= return . cmGetDFlags
+
+setDynFlags dflags = do s <- getCmState; setCmState (cmSetDFlags s dflags)
+
 isOptionSet :: GHCiOption -> GHCi Bool
 isOptionSet opt
  = do st <- getGHCiState
@@ -979,225 +1087,12 @@ io m = GHCi { unGHCi = \s -> m >>= return }
 ghciHandle :: (Exception -> GHCi a) -> GHCi a -> GHCi a
 ghciHandle h (GHCi m) = GHCi $ \s -> 
    Exception.catch (m s) 
-	(\e -> unGHCi (ghciHandle h (ghciUnblock (h e))) s)
+	(\e -> unGHCi (ghciUnblock (h e)) s)
 
 ghciUnblock :: GHCi a -> GHCi a
 ghciUnblock (GHCi a) = GHCi $ \s -> Exception.unblock (a s)
 
 -----------------------------------------------------------------------------
--- package loader
-
--- Left: full path name of a .o file, including trailing .o
--- Right: "unadorned" name of a .DLL/.so
---        e.g.    On unix     "qt"  denotes "libqt.so"
---                On WinDoze  "burble"  denotes "burble.DLL"
---        addDLL is platform-specific and adds the lib/.so/.DLL
---        suffixes platform-dependently; we don't do that here.
--- 
--- For dynamic objects only, try to find the object file in all the 
--- directories specified in v_Library_Paths before giving up.
-
-data LibrarySpec = Object FilePath | DLL String
-#ifdef darwin_TARGET_OS
-		    | Framework String
-#endif
-
--- Packages that don't need loading, because the compiler shares them with
--- the interpreted program.
-dont_load_these = [ "rts" ]
-
--- Packages that are already linked into GHCi.  For mingw32, we only
--- skip gmp and rts, since std and after need to load the msvcrt.dll
--- library which std depends on.
-loaded_in_ghci
-#          ifndef mingw32_TARGET_OS
-           = [ "std", "concurrent", "posix", "text", "util" ]
-#          else
-	   = [ ]
-#          endif
-
-showLS (Object nm)  = "(static) " ++ nm
-showLS (DLL nm) = "(dynamic) " ++ nm
-#ifdef darwin_TARGET_OS
-showLS (Framework nm) = "(framework) " ++ nm
-#endif
-
-linkPackages :: DynFlags -> [LibrarySpec] -> [PackageConfig] -> IO ()
-linkPackages dflags cmdline_lib_specs pkgs
-   = do mapM_ (linkPackage dflags) (reverse pkgs)
-        lib_paths <- readIORef v_Library_paths
-        mapM_ (preloadLib dflags lib_paths) cmdline_lib_specs
-	if (null cmdline_lib_specs)
-	   then return ()
-	   else do maybePutStr dflags "final link ... "
-
-		   ok <- resolveObjs
-		   if ok then maybePutStrLn dflags "done."
-	      		 else throwDyn (InstallationError 
-                                          "linking extra libraries/objects failed")
-     where
-        preloadLib :: DynFlags -> [String] -> LibrarySpec -> IO ()
-        preloadLib dflags lib_paths lib_spec
-           = do maybePutStr dflags ("Loading object " ++ showLS lib_spec ++ " ... ")
-                case lib_spec of
-                   Object static_ish
-                      -> do b <- preload_static lib_paths static_ish
-                            maybePutStrLn dflags (if b  then "done." 
-							else "not found")
-                   DLL dll_unadorned
-                      -> -- We add "" to the set of paths to try, so that
-                         -- if none of the real paths match, we force addDLL
-                         -- to look in the default dynamic-link search paths.
-                         do maybe_errstr <- loadDynamic (lib_paths++[""]) 
-                                                            dll_unadorned
-                            case maybe_errstr of
-                               Nothing -> return ()
-                               Just mm -> preloadFailed mm lib_paths lib_spec
-                            maybePutStrLn dflags "done"
-
-        preloadFailed :: String -> [String] -> LibrarySpec -> IO ()
-        preloadFailed sys_errmsg paths spec
-           = do maybePutStr dflags
-		       ("failed.\nDynamic linker error message was:\n   " 
-                        ++ sys_errmsg  ++ "\nWhilst trying to load:  " 
-                        ++ showLS spec ++ "\nDirectories to search are:\n"
-                        ++ unlines (map ("   "++) paths) )
-                give_up
-
-        -- not interested in the paths in the static case.
-        preload_static paths name
-           = do b <- doesFileExist name
-                if not b then return False
-                         else loadObj name >> return True
-
-        give_up 
-           = (throwDyn . CmdLineError)
-                "user specified .o/.so/.DLL could not be loaded."
-
-linkPackage :: DynFlags -> PackageConfig -> IO ()
-linkPackage dflags pkg
-   | name pkg `elem` dont_load_these = return ()
-   | otherwise
-   = do 
-        let dirs      =  library_dirs pkg
-        let libs      =  hs_libraries pkg ++ extra_libraries pkg
-        classifieds   <- mapM (locateOneObj dirs) libs
-#ifdef darwin_TARGET_OS
-        let fwDirs    =  framework_dirs pkg
-        let frameworks=  extra_frameworks pkg
-#endif
-
-        -- Complication: all the .so's must be loaded before any of the .o's.  
-	let dlls = [ dll | DLL dll <- classifieds ]
-	    objs = [ obj | Object obj <- classifieds ]
-
-	maybePutStr dflags ("Loading package " ++ name pkg ++ " ... ")
-
-	-- If this package is already part of the GHCi binary, we'll already
-	-- have the right DLLs for this package loaded, so don't try to
-	-- load them again.
-	when (name pkg `notElem` loaded_in_ghci) $ do
-#ifdef darwin_TARGET_OS
-	    loadFrameworks fwDirs frameworks
-#endif
-	    loadDynamics dirs dlls
-	
-	-- After loading all the DLLs, we can load the static objects.
-	mapM_ loadObj objs
-
-        maybePutStr dflags "linking ... "
-        ok <- resolveObjs
-	if ok then maybePutStrLn dflags "done."
-	      else panic ("can't load package `" ++ name pkg ++ "'")
-
-loadDynamics dirs [] = return ()
-loadDynamics dirs (dll:dlls) = do
-  r <- loadDynamic dirs dll
-  case r of
-    Nothing  -> loadDynamics dirs dlls
-    Just err -> throwDyn (CmdLineError ("can't load .so/.DLL for: " 
-                                       ++ dll ++ " (" ++ err ++ ")" ))
-#ifdef darwin_TARGET_OS
-loadFrameworks dirs [] = return ()
-loadFrameworks dirs (fw:fws) = do
-  r <- loadFramework dirs fw
-  case r of
-    Nothing  -> loadFrameworks dirs fws
-    Just err -> throwDyn (CmdLineError ("can't load framework: " 
-                                       ++ fw ++ " (" ++ err ++ ")" ))
-#endif
-
--- Try to find an object file for a given library in the given paths.
--- If it isn't present, we assume it's a dynamic library.
-locateOneObj :: [FilePath] -> String -> IO LibrarySpec
-locateOneObj [] lib
-   = return (DLL lib) -- we assume
-locateOneObj (d:ds) lib
-   = do let path = d ++ '/':lib ++ ".o"
-        b <- doesFileExist path
-        if b then return (Object path) else locateOneObj ds lib
-
--- ----------------------------------------------------------------------------
--- Loading a dyanmic library (dlopen()-ish on Unix, LoadLibrary-ish on Win32)
-
-#if defined(mingw32_TARGET_OS) || defined(cygwin32_TARGET_OS)
-loadDynamic paths rootname = addDLL rootname
-  -- ignore paths on windows (why? --SDM)
-
-#else
-
--- return Nothing == success, else Just error message from dlopen
-loadDynamic (path:paths) rootname = do
-  let dll = path ++ '/':mkSOName rootname
-  b <- doesFileExist dll
-  if not b
-     then loadDynamic paths rootname
-     else addDLL dll
-loadDynamic [] rootname = do
-	-- tried all our known library paths, let dlopen() search its
-	-- own builtin paths now.
-   addDLL (mkSOName rootname)
-
-#ifdef darwin_TARGET_OS
-mkSOName root = "lib" ++ root ++ ".dylib"
-#else
-mkSOName root = "lib" ++ root ++ ".so"
-#endif
-
-#endif
-
--- Darwin / MacOS X only: load a framework
--- a framework is a dynamic library packaged inside a directory of the same
--- name. They are searched for in different paths than normal libraries.
-#ifdef darwin_TARGET_OS
-loadFramework extraPaths rootname
-   = loadFramework' (extraPaths ++ defaultFrameworkPaths) where
-   defaultFrameworkPaths = ["/Library/Frameworks", "/System/Library/Frameworks"]
-
-   loadFramework' (path:paths) = do
-      let dll = path ++ '/' : rootname ++ ".framework/" ++ rootname
-      b <- doesFileExist dll
-      if not b
-         then loadFramework' paths
-         else addDLL dll
-   loadFramework' [] = do
-	-- tried all our known library paths, but dlopen()
-	-- has no built-in paths for frameworks: give up
-      return $ Just $ "not found"
-#endif
-
-addDLL :: String -> IO (Maybe String)
-addDLL str = do
-  maybe_errmsg <- withCString str $ \dll -> c_addDLL dll
-  if maybe_errmsg == nullPtr
-	then return Nothing
-	else do str <- peekCString maybe_errmsg
-		return (Just str)
-
-foreign import ccall "addDLL" unsafe  
-  c_addDLL :: CString -> IO CString
-
------------------------------------------------------------------------------
 -- timing & statistics
 
 timeIt :: GHCi a -> GHCi a
@@ -1210,34 +1105,42 @@ timeIt action
 		  a <- action
 		  allocs2 <- io $ getAllocations
 		  time2   <- io $ getCPUTime
-		  io $ printTimes (allocs2 - allocs1) (time2 - time1)
+		  io $ printTimes (fromIntegral (allocs2 - allocs1)) 
+				  (time2 - time1)
 		  return a
 
-foreign import "getAllocations" getAllocations :: IO Int
+foreign import ccall unsafe "getAllocations" getAllocations :: IO Int64
+	-- defined in ghc/rts/Stats.c
 
-printTimes :: Int -> Integer -> IO ()
+printTimes :: Integer -> Integer -> IO ()
 printTimes allocs psecs
    = do let secs = (fromIntegral psecs / (10^12)) :: Float
 	    secs_str = showFFloat (Just 2) secs
 	putStrLn (showSDoc (
 		 parens (text (secs_str "") <+> text "secs" <> comma <+> 
-			 int allocs <+> text "bytes")))
-
------------------------------------------------------------------------------
--- utils
-
-looksLikeModuleName [] = False
-looksLikeModuleName (c:cs) = isUpper c && all isAlphaNumEx cs
-
-isAlphaNumEx c = isAlphaNum c || c == '_' || c == '.'
-
-maybePutStr dflags s | verbosity dflags > 0 = putStr s
-		     | otherwise	    = return ()
-
-maybePutStrLn dflags s | verbosity dflags > 0 = putStrLn s
-		       | otherwise	      = return ()
+			 text (show allocs) <+> text "bytes")))
 
 -----------------------------------------------------------------------------
 -- reverting CAFs
 	
-foreign import revertCAFs :: IO ()	-- make it "safe", just in case
+revertCAFs :: IO ()
+revertCAFs = do
+  rts_revertCAFs
+  turnOffBuffering
+	-- Have to turn off buffering again, because we just 
+	-- reverted stdout, stderr & stdin to their defaults.
+
+foreign import ccall "revertCAFs" rts_revertCAFs  :: IO ()  
+	-- Make it "safe", just in case
+
+-- -----------------------------------------------------------------------------
+-- Utils
+
+expandPath :: String -> GHCi String
+expandPath path = 
+  case dropWhile isSpace path of
+   ('~':d) -> do
+	tilde <- io (getEnv "HOME")	-- will fail if HOME not defined
+	return (tilde ++ '/':d)
+   other -> 
+	return other