X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fghci%2FInteractiveUI.hs;h=a1ec76433b4285af3989ab3f78668bd28e8156d3;hb=550421384b8364cdaf3135f7859c9f7d7ee1fff1;hp=dcdf33809fc0137282bd4b431858bb2872206eec;hpb=98f311902edf1743743d643fbcc929f77e104109;p=ghc-hetmet.git

diff --git a/ghc/compiler/ghci/InteractiveUI.hs b/ghc/compiler/ghci/InteractiveUI.hs
index dcdf338..a1ec764 100644
--- a/ghc/compiler/ghci/InteractiveUI.hs
+++ b/ghc/compiler/ghci/InteractiveUI.hs
@@ -1,68 +1,75 @@
-{-# OPTIONS -#include "Linker.h" -#include "SchedAPI.h" #-}
+{-# OPTIONS -#include "Linker.h" #-}
 -----------------------------------------------------------------------------
--- $Id: InteractiveUI.hs,v 1.100 2001/10/23 22:20:33 sof Exp $
+-- $Id: InteractiveUI.hs,v 1.162 2003/12/10 14:15:21 simonmar Exp $
 --
 -- GHC Interactive User Interface
 --
 -- (c) The GHC Team 2000
 --
 -----------------------------------------------------------------------------
-module InteractiveUI ( interactiveUI, ghciWelcomeMsg ) where
+module InteractiveUI ( 
+	interactiveUI,  -- :: CmState -> [FilePath] -> IO ()
+	ghciWelcomeMsg
+   ) where
 
 #include "../includes/config.h"
 #include "HsVersions.h"
 
-import Packages
 import CompManager
-import HscTypes		( TyThing(..) )
-import MkIface
-import ByteCodeLink
+import HscTypes		( TyThing(..), HomeModInfo(hm_linkable), HomePackageTable,
+			  isObjectLinkable, GhciMode(..) )
+import IfaceSyn		( IfaceDecl( ifName ) )
 import DriverFlags
 import DriverState
-import DriverUtil
-import Linker
-import Finder		( flushPackageCache )
+import DriverUtil	( remove_spaces )
+import Linker		( showLinkerState, linkPackages )
 import Util
-import Id		( isRecordSelector, recordSelectorFieldLabel, 
-			  isDataConWrapId, idName )
-import Class		( className )
-import TyCon		( tyConName, tyConClass_maybe, isPrimTyCon )
-import FieldLabel	( fieldLabelTyCon )
-import SrcLoc		( isGoodSrcLoc )
+import Module		( showModMsg, lookupModuleEnv )
 import Name		( Name, isHomePackageName, nameSrcLoc, nameOccName,
 			  NamedThing(..) )
 import OccName		( isSymOcc )
-import BasicTypes	( defaultFixity )
+import BasicTypes	( defaultFixity, SuccessFlag(..) )
+import Packages
 import Outputable
-import CmdLineOpts	( DynFlag(..), getDynFlags, saveDynFlags, restoreDynFlags, dopt_unset )
-import Panic		( GhcException(..) )
+import CmdLineOpts	( DynFlag(..), DynFlags(..), getDynFlags, saveDynFlags,
+			  restoreDynFlags, dopt_unset )
+import Panic 		hiding ( showException )
 import Config
 
-#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 
+import Control.Concurrent	( yield )	-- Used in readline loop
+import System.Console.Readline as Readline
 #endif
-import Concurrent
-import IOExts
-import SystemExts
+
+--import SystemExts
+
+import Control.Exception as Exception
+import Data.Dynamic
+import Control.Concurrent
 
 import Numeric
-import List
-import System
-import CPUTime
-import Directory
-import IO
-import Char
-import Monad 		( when, join )
-
-import PrelGHC 		( unsafeCoerce# )
-import Foreign		( nullPtr )
-import CString		( peekCString )
+import Data.List
+import System.Cmd
+import System.CPUTime
+import System.Environment
+import System.Directory
+import System.IO as IO
+import Data.Char
+import Control.Monad as Monad
+
+import GHC.Exts		( unsafeCoerce# )
+
+import Data.IORef	( IORef, newIORef, readIORef, writeIORef )
+
+import System.Posix.Internals ( setNonBlockingFD )
 
 -----------------------------------------------------------------------------
 
@@ -77,16 +84,18 @@ 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),
   ("unset",	keepGoing unsetOptions),
   ("undef",     keepGoing undefineMacro),
@@ -96,31 +105,41 @@ 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\ 
-\\
-\   <stmt>		   evaluate/run <stmt>\n\ 
-\   :add <filename> ...    add module(s) to the current target set\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 to <mod>\n\ 
-\   :reload		   reload the current module set\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\ 
-\   :undef <cmd> 	   undefine user-defined command :<cmd>\n\ 
-\   :type <expr>	   show the type of <expr>\n\ 
-\   :unset <option> ...	   unset options\n\ 
-\   :quit		   exit GHCi\n\ 
-\   :!<command>		   run the shell command <command>\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\ 
@@ -128,50 +147,35 @@ helpText = "\
 \                         (eg. -v2, -fglasgow-exts, etc.)\n\ 
 \"
 
-interactiveUI :: CmState -> [FilePath] -> [LibrarySpec] -> IO ()
-interactiveUI cmstate paths cmdline_libs = do
+interactiveUI :: [FilePath] -> Maybe String -> IO ()
+interactiveUI srcs maybe_expr = do
+   dflags <- getDynFlags
+
+   cmstate <- cmInit Interactive dflags;
+
    hFlush stdout
    hSetBuffering stdout NoBuffering
 
-   -- link in the available packages
-   pkgs <- getPackageInfo
-   initLinker
-   linkPackages cmdline_libs pkgs
+	-- Initialise buffering for the *interpreted* I/O system
+   initInterpBuffering cmstate
 
-   (cmstate, ok, mods) <-
-   	case paths of
-	     [] -> return (cmstate, True, [])
-	     _  -> cmLoadModule cmstate paths
+	-- We don't want the cmd line to buffer any input that might be
+	-- intended for the program, so unbuffer stdin.
+   hSetBuffering stdin NoBuffering
+
+	-- initial context is just the Prelude
+   cmstate <- cmSetContext cmstate [] ["Prelude"]
 
 #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
    Readline.initialize
 #endif
 
-   dflags <- getDynFlags
-
-   (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 PrelHandle.stderr"
-   case maybe_hval of
-	Just hval -> writeIORef flush_stderr (unsafeCoerce# hval :: IO ())
-	_ -> panic "interactiveUI:stderr"
-
-   (cmstate, maybe_hval) 
-	<- cmCompileExpr cmstate dflags "IO.hFlush PrelHandle.stdout"
-   case maybe_hval of
-	Just hval -> writeIORef flush_stdout (unsafeCoerce# hval :: IO ())
-	_ -> panic "interactiveUI:stdout"
-
-   startGHCi runGHCi GHCiState{ progname = "<interactive>",
-				args = [],
-				targets = paths,
-			        cmstate = cmstate,
-			        options = [] }
+   startGHCi (runGHCi srcs dflags maybe_expr)
+	GHCiState{ progname = "<interactive>",
+		   args = [],
+		   targets = srcs,
+		   cmstate = cmstate,
+		   options = [] }
 
 #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
    Readline.resetTerminal Nothing
@@ -179,9 +183,8 @@ interactiveUI cmstate paths cmdline_libs = do
 
    return ()
 
-
-runGHCi :: GHCi ()
-runGHCi = 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
@@ -213,21 +216,42 @@ runGHCi = do
   		  Left e    -> return ()
   		  Right hdl -> fileLoop hdl False
 
-  interactiveLoop
+  -- Perform a :load for files given on the GHCi command line
+  when (not (null paths)) $
+     ghciHandle showException $
+	loadModule paths
+
+  -- 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)
+  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
+	    runCommand expr
+	    return ()
 
   -- and finally, exit
-  io $ do putStrLn "Leaving GHCi."
+  io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
+
 
+interactiveLoop is_tty show_prompt = do
+  -- Ignore ^C exceptions caught here
+  ghciHandleDyn (\e -> case e of 
+			Interrupted -> ghciUnblock (interactiveLoop is_tty show_prompt)
+			_other      -> return ()) $ do
 
-interactiveLoop = do
-  -- ignore ^C exceptions caught here
-  ghciHandleDyn (\e -> case e of Interrupted -> ghciUnblock interactiveLoop
-			         _other      -> return ()) $ do
   -- read commands from stdin
 #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
-  readlineLoop
+  if (is_tty) 
+	then readlineLoop
+	else fileLoop stdin show_prompt
 #else
-  fileLoop stdin True
+  fileLoop stdin show_prompt
 #endif
 
 
@@ -242,10 +266,10 @@ interactiveLoop = do
 
 checkPerms :: String -> IO Bool
 checkPerms name =
-  handle (\_ -> return False) $ do
-#ifdef mingw32_TARGET_OS
-     doesFileExist name
+#ifdef mingw32_HOST_OS
+  return True
 #else
+  DriverUtil.handle (\_ -> return False) $ do
      st <- getFileStatus name
      me <- getRealUserID
      if fileOwner st /= me then do
@@ -264,13 +288,13 @@ checkPerms name =
 
 fileLoop :: Handle -> Bool -> GHCi ()
 fileLoop hdl prompt = do
-   st <- getGHCiState
-   mod <- io (cmGetContext (cmstate st))
-   when prompt (io (putStr (mod ++ "> ")))
+   cmstate <- getCmState
+   (mod,imports) <- io (cmGetContext cmstate)
+   when prompt (io (putStr (mkPrompt mod imports)))
    l <- io (IO.try (hGetLine hdl))
    case l of
 	Left e | isEOFError e -> return ()
-	       | otherwise    -> throw e
+	       | otherwise    -> io (ioError e)
 	Right l -> 
 	  case remove_spaces l of
 	    "" -> fileLoop hdl prompt
@@ -280,19 +304,24 @@ fileLoop hdl prompt = do
 stringLoop :: [String] -> GHCi ()
 stringLoop [] = return ()
 stringLoop (s:ss) = do
-   st <- getGHCiState
    case remove_spaces s of
 	"" -> stringLoop ss
 	l  -> do quit <- runCommand l
                  if quit then return () else stringLoop ss
 
+mkPrompt toplevs exports
+   = concat (intersperse " " (map ('*':) toplevs ++ exports)) ++ "> "
+
 #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
 readlineLoop :: GHCi ()
 readlineLoop = do
-   st <- getGHCiState
-   mod <- io (cmGetContext (cmstate st))
+   cmstate <- getCmState
+   (mod,imports) <- io (cmGetContext cmstate)
    io yield
-   l <- io (readline (mod ++ "> "))
+   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  ->
@@ -304,30 +333,32 @@ 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 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
-    Nothing -> 
-	io (putStrLn ("*** Exception: (unknown)"))
-    Just (PhaseFailed phase code) ->
-	io (putStrLn ("Phase " ++ phase ++ " failed (code "
-		       ++ show code ++ ")"))
-    Just Interrupted ->
-	io (putStrLn "Interrupted.")
-    Just (CmdLineError s) -> 
-	io (putStrLn s)	 -- omit the location for CmdLineError
-    Just other_ghc_ex ->
-	io (putStrLn (show other_ghc_ex))
+    Nothing               -> io (putStrLn ("*** Exception: (unknown)"))
+    Just Interrupted      -> io (putStrLn "Interrupted.")
+    Just (CmdLineError s) -> io (putStrLn s)	 -- omit the location for CmdLineError
+    Just ph@PhaseFailed{} -> io (putStrLn (showGhcException ph "")) -- ditto
+    Just other_ghc_ex     -> io (print other_ghc_ex)
+
 showException other_exception
   = io (putStrLn ("*** Exception: " ++ show other_exception))
 
@@ -342,26 +373,27 @@ runStmt stmt
  | otherwise
  = do st <- getGHCiState
       dflags <- io getDynFlags
-      let dflags' = dopt_unset dflags Opt_WarnUnusedBinds
+      let cm_state' = cmSetDFlags (cmstate st)
+			 	  (dopt_unset dflags Opt_WarnUnusedBinds)
       (new_cmstate, result) <- 
 	io $ withProgName (progname st) $ withArgs (args st) $
-	cmRunStmt (cmstate st) dflags' stmt
+	     cmRunStmt cm_state' stmt
       setGHCiState st{cmstate = new_cmstate}
       case result of
 	CmRunFailed      -> return []
 	CmRunException e -> showException e >> return []
-	CmRunDeadlocked  -> io (putStrLn "Deadlocked.") >> return []
 	CmRunOk names    -> return names
 
 -- possibly print the type and revert CAFs after evaluating an expression
 finishEvalExpr names
  = do b <- isOptionSet ShowType
-      st <- getGHCiState
-      when b (mapM_ (showTypeOfName (cmstate st)) 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 ()
@@ -371,12 +403,6 @@ 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
@@ -393,6 +419,46 @@ specialCommand str = do
 
 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 = "IO.hSetBuffering IO.stdout IO.NoBuffering" ++
+	     " Prelude.>> IO.hSetBuffering IO.stderr IO.NoBuffering"
+flush_cmd  = "IO.hFlush IO.stdout Prelude.>> 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
 
@@ -403,31 +469,37 @@ info :: String -> GHCi ()
 info "" = throwDyn (CmdLineError "syntax: `:i <thing-you-want-info-about>'")
 info s = do
   let names = words s
-  state <- getGHCiState
-  dflags <- io getDynFlags
+  init_cms <- getCmState
   let 
     infoThings cms [] = return cms
     infoThings cms (name:names) = do
-      (cms, unqual, stuff) <- io (cmInfoThing cms dflags name)
+      stuff <- io (cmInfoThing cms name)
       io (putStrLn (showSDocForUser unqual (
 	    vcat (intersperse (text "") (map showThing stuff))))
          )
       infoThings cms names
 
-    showThing (ty_thing, fixity) 
-	= vcat [ text "-- " <> showTyThing ty_thing, 
-		 showFixity fixity (getName ty_thing),
-	         ppr (ifaceTyThing ty_thing) ]
+    unqual = cmGetPrintUnqual init_cms
+
+    showThing (decl, fixity) 
+	= vcat [ text "-- " <> showTyThing decl, 
+		 showFixity fixity (ifName decl),
+	         showTyThing decl ]
 
     showFixity fix name
 	| fix == defaultFixity = empty
 	| otherwise            = ppr fix <+> 
-				 (if isSymOcc (nameOccName name)
-					then ppr name
-					else char '`' <> ppr name <> char '`')
+				 (if isSymOcc name
+				  then ppr name
+				  else char '`' <> ppr name <> char '`')
 
+    showTyThing decl = ppr decl
+
+{-
     showTyThing (AClass cl)
        = hcat [ppr cl, text " is a class", showSrcLoc (className cl)]
+    showTyThing (ADataCon dc)
+       = hcat [ppr dc, text " is a data constructor", showSrcLoc (dataConName dc)]
     showTyThing (ATyCon ty)
        | isPrimTyCon ty
        = hcat [ppr ty, text " is a primitive type constructor"]
@@ -437,13 +509,10 @@ info s = do
        = 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"
+       = case globalIdDetails id of
+	    RecordSelId lbl -> text "record selector for type" <+> ppr (fieldLabelTyCon lbl)
+	    ClassOpId cls   -> text "method in class" <+> ppr cls
+       	    otherwise       -> text "variable"
 
 	-- also print out the source location for home things
     showSrcLoc name
@@ -452,40 +521,35 @@ info s = do
 	| otherwise
 	= empty
 	where loc = nameSrcLoc name
+-}
 
-  cms <- infoThings (cmstate state) names
-  setGHCiState state{ cmstate = cms }
+  infoThings init_cms names
   return ()
 
-
-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 
-  (cmstate1, ok, mods) <- io (cmLoadModule (cmstate state) new_targets)
+  graph <- io (cmDepAnal (cmstate state) new_targets)
+  (cmstate1, ok, mods) <- io (cmLoadModules (cmstate state) graph)
   setGHCiState state{ cmstate = cmstate1, targets = new_targets }
-  modulesLoadedMsg ok mods
-
-setContext :: String -> GHCi ()
-setContext ""
-  = throwDyn (CmdLineError "syntax: `:m <module>'")
-setContext m | not (isUpper (head m)) || not (all isAlphaNumEx (tail m))
-  = throwDyn (CmdLineError ("strange looking module name: `" ++ m ++ "'"))
-    where
-       isAlphaNumEx c = isAlphaNum c || c == '_'
-setContext str
-  = do st <- getGHCiState
-       new_cmstate <- io (cmSetContext (cmstate st) str)
-       setGHCiState st{cmstate=new_cmstate}
+  setContextAfterLoad mods
+  dflags <- io 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, \n\ 
+	\because 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
@@ -504,10 +568,8 @@ defineMacro s = do
   let new_expr = '(' : definition ++ ") :: String -> IO String"
 
   -- compile the expression
-  st <- getGHCiState
-  dflags <- io getDynFlags
-  (new_cmstate, maybe_hv) <- io (cmCompileExpr (cmstate st) dflags new_expr)
-  setGHCiState st{cmstate = new_cmstate}
+  cms <- getCmState
+  maybe_hv <- io (cmCompileExpr cms new_expr)
   case maybe_hv of
      Nothing -> return ()
      Just hv -> io (writeIORef commands --
@@ -531,52 +593,77 @@ undefineMacro macro_name = do
 	else do
   io (writeIORef commands (filter ((/= macro_name) . fst) cmds))
 
-loadModule :: String -> GHCi ()
-loadModule str = timeIt (loadModule' str)
 
-loadModule' str = do
-  let files = words str
+loadModule :: [FilePath] -> GHCi ()
+loadModule fs = timeIt (loadModule' fs)
+
+loadModule' :: [FilePath] -> GHCi ()
+loadModule' files = do
   state <- getGHCiState
-  dflags <- io getDynFlags
-  cmstate1 <- io (cmUnload (cmstate state) dflags)
+
+  -- 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) files)
+
+  -- Dependency anal ok, now unload everything
+  cmstate1 <- io (cmUnload (cmstate state))
   setGHCiState state{ cmstate = cmstate1, targets = [] }
-  io (revertCAFs)			-- always revert CAFs on load.
-  (cmstate2, ok, mods) <- io (cmLoadModule cmstate1 files)
+
+  io (revertCAFs)  -- always revert CAFs on load.
+  (cmstate2, ok, mods) <- io (cmLoadModules cmstate1 graph)
   setGHCiState state{ cmstate = cmstate2, targets = files }
-  modulesLoadedMsg ok mods
+
+  setContextAfterLoad mods
+  dflags <- io (getDynFlags)
+  modulesLoadedMsg ok mods dflags
+
 
 reloadModule :: String -> GHCi ()
 reloadModule "" = do
   state <- getGHCiState
   case targets state of
    [] -> io (putStr "no current target\n")
-   paths
-      -> do io (revertCAFs)		-- always revert CAFs on reload.
-	    (new_cmstate, ok, mods) <- io (cmLoadModule (cmstate state) paths)
-            setGHCiState state{ cmstate=new_cmstate }
-	    modulesLoadedMsg ok mods
+   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) paths)
+
+	io (revertCAFs)		-- always revert CAFs on reload.
+	(cmstate1, ok, mods) 
+		<- io (cmLoadModules (cmstate state) graph)
+        setGHCiState state{ cmstate=cmstate1 }
+	setContextAfterLoad mods
+	dflags <- io getDynFlags
+	modulesLoadedMsg ok mods dflags
 
 reloadModule _ = noArgs ":reload"
 
+setContextAfterLoad [] = setContext prel
+setContextAfterLoad (m:_) = do
+  cmstate <- getCmState
+  b <- io (cmModuleIsInterpreted cmstate m)
+  if b then setContext ('*':m) else setContext m
 
-modulesLoadedMsg ok mods = do
-  let mod_commas 
+modulesLoadedMsg ok mods dflags =
+  when (verbosity dflags > 0) $ do
+   let mod_commas 
 	| null mods = text "none."
 	| otherwise = hsep (
 	    punctuate comma (map text mods)) <> text "."
-  case ok of
-    False -> 
+   case ok of
+    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 st <- getGHCiState
-       dflags <- io getDynFlags
-       (new_cmstate, maybe_tystr) <- io (cmTypeOfExpr (cmstate st) dflags str)
-       setGHCiState st{cmstate = new_cmstate}
+  = do cms <- getCmState
+       maybe_tystr <- io (cmTypeOfExpr cms str)
        case maybe_tystr of
 	  Nothing    -> return ()
 	  Just tystr -> io (putStrLn tystr)
@@ -587,6 +674,96 @@ quit _ = return True
 shellEscape :: String -> GHCi Bool
 shellEscape str = io (system str >> return False)
 
+-----------------------------------------------------------------------------
+-- Browing a module's contents
+
+browseCmd :: String -> GHCi ()
+browseCmd m = 
+  case words m of
+    ['*':m] | looksLikeModuleName m -> browseModule m False
+    [m]     | looksLikeModuleName m -> browseModule m True
+    _ -> throwDyn (CmdLineError "syntax:  :browse <module>")
+
+browseModule m exports_only = do
+  cms <- getCmState
+
+  is_interpreted <- io (cmModuleIsInterpreted cms m)
+  when (not is_interpreted && not exports_only) $
+	throwDyn (CmdLineError ("module `" ++ m ++ "' is not interpreted"))
+
+  -- 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 [] [prel,m]
+			      else cmSetContext cms [m] [])
+  cms2 <- io (cmSetContext cms1 as bs)
+
+  things <- io (cmBrowseModule cms2 m exports_only)
+
+  let unqual = cmGetPrintUnqual cms1 -- NOTE: cms1 with the new context
+
+  io (putStrLn (showSDocForUser unqual (
+   	 vcat (map ppr things)
+      )))
+
+-----------------------------------------------------------------------------
+-- Setting the module context
+
+setContext str
+  | all sensible mods = fn mods
+  | otherwise = throwDyn (CmdLineError "syntax:  :module [+/-] [*]M1 ... [*]Mn")
+  where
+    (fn, mods) = case str of 
+			'+':stuff -> (addToContext,      words stuff)
+			'-':stuff -> (removeFromContext, words stuff)
+			stuff     -> (newContext,        words stuff) 
+
+    sensible ('*':m) = looksLikeModuleName m
+    sensible m       = looksLikeModuleName m
+
+newContext mods = do
+  cms <- getCmState
+  (as,bs) <- separate cms mods [] []
+  let bs' = if null as && prel `notElem` bs then prel:bs else 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"))
+separate cmstate (m:ms)       as bs = separate cmstate ms as (m:bs)
+
+prel = "Prelude"
+
+
+addToContext mods = do
+  cms <- getCmState
+  (as,bs) <- io (cmGetContext cms)
+
+  (as',bs') <- separate cms mods [] []
+
+  let as_to_add = as' \\ (as ++ bs)
+      bs_to_add = bs' \\ (as ++ bs)
+
+  cms' <- io (cmSetContext cms
+			(as ++ as_to_add) (bs ++ bs_to_add))
+  setCmState cms'
+
+
+removeFromContext mods = do
+  cms <- getCmState
+  (as,bs) <- io (cmGetContext cms)
+
+  (as_to_remove,bs_to_remove) <- separate cms mods [] []
+
+  let as' = as \\ (as_to_remove ++ bs_to_remove)
+      bs' = bs \\ (as_to_remove ++ bs_to_remove)
+
+  cms' <- io (cmSetContext cms as' bs')
+  setCmState cms'
+
 ----------------------------------------------------------------------------
 -- Code for `:set'
 
@@ -626,21 +803,28 @@ setProg _ = do
 setOptions wds =
    do -- first, deal with the GHCi opts (+s, +t, etc.)
       let (plus_opts, minus_opts)  = partition isPlus wds
-      mapM setOpt plus_opts
+      mapM_ setOpt plus_opts
 
       -- now, the GHC flags
-      pkgs_before <- io (readIORef v_Packages)
+      pkgs_before <- io (readIORef v_ExplicitPackages)
       leftovers   <- io (processArgs static_flags minus_opts [])
-      pkgs_after  <- io (readIORef v_Packages)
+      pkgs_after  <- io (readIORef v_ExplicitPackages)
 
       -- update things if the users wants more packages
-      when (pkgs_before /= pkgs_after) $
-	 newPackages (pkgs_after \\ pkgs_before)
+      let new_packages = pkgs_after \\ pkgs_before
+      when (not (null new_packages)) $
+	 newPackages new_packages
+
+      -- don't forget about the extra command-line flags from the 
+      -- extra_ghc_opts fields in the new packages
+      new_package_details <- io (getPackageDetails new_packages)
+      let pkg_extra_opts = concatMap extra_ghc_opts new_package_details
+      pkg_extra_dyn <- io (processArgs static_flags pkg_extra_opts [])
 
       -- then, dynamic flags
       io $ do 
 	restoreDynFlags
-        leftovers <- processArgs dynamic_flags leftovers []
+        leftovers <- processArgs dynamic_flags (leftovers ++ pkg_extra_dyn) []
 	saveDynFlags
 
         if (not (null leftovers))
@@ -660,7 +844,7 @@ unsetOptions str
 	  then io (putStrLn ("unknown option: `" ++ head rest2 ++ "'"))
 	  else do
 
-       mapM unsetOpt plus_opts
+       mapM_ unsetOpt plus_opts
  
        -- can't do GHC flags for now
        if (not (null minus_opts))
@@ -694,18 +878,51 @@ 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   <- io getDynFlags
+  io (linkPackages dflags new_pkgs)
+  setContextAfterLoad []
+
+-- ---------------------------------------------------------------------------
+-- 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, hpt) = cmGetModInfo cms
+  mapM_ (showModule hpt) mg
+
+
+showModule :: HomePackageTable -> ModSummary -> GHCi ()
+showModule hpt mod_summary
+  = case lookupModuleEnv hpt mod of
+	Nothing	      -> panic "missing linkable"
+	Just mod_info -> io (putStrLn (showModMsg obj_linkable mod locn))
+		      where
+			 obj_linkable = isObjectLinkable (hm_linkable mod_info)
+  where
+    mod = ms_mod mod_summary
+    locn = ms_location mod_summary
+
+showBindings = do
+  cms <- getCmState
+  let
+	unqual = cmGetPrintUnqual cms
+--	showBinding b = putStrLn (showSDocForUser unqual (ppr (ifaceTyThing b)))
+	showBinding b = putStrLn (showSDocForUser unqual (ppr (getName b)))
+
+  io (mapM_ showBinding (cmGetBindings cms))
+  return ()
 
-  io $ do
-    pkgs <- getPackageInfo
-    flushPackageCache pkgs
-   
-    new_pkg_info <- getPackageDetails new_pkgs
-    mapM_ linkPackage (reverse new_pkg_info)
 
 -----------------------------------------------------------------------------
 -- GHCi monad
@@ -725,9 +942,6 @@ 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
@@ -744,6 +958,10 @@ ghciHandleDyn h (GHCi m) = GHCi $ \s ->
 getGHCiState   = GHCi $ \r -> readIORef r
 setGHCiState s = GHCi $ \r -> writeIORef r s
 
+-- for convenience...
+getCmState = getGHCiState >>= return . cmstate
+setCmState cms = do s <- getGHCiState; setGHCiState s{cmstate=cms}
+
 isOptionSet :: GHCiOption -> GHCi Bool
 isOptionSet opt
  = do st <- getGHCiState
@@ -772,143 +990,12 @@ 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.
-
-type LibrarySpec
-   = Either FilePath String
-
-showLS (Left nm)  = "(static) " ++ nm
-showLS (Right nm) = "(dynamic) " ++ nm
-
-linkPackages :: [LibrarySpec] -> [PackageConfig] -> IO ()
-linkPackages cmdline_lib_specs pkgs
-   = do mapM_ linkPackage (reverse pkgs)
-        lib_paths <- readIORef v_Library_paths
-        mapM_ (preloadLib lib_paths) cmdline_lib_specs
-	if (null cmdline_lib_specs)
-	   then return ()
-	   else do putStr "final link ... "
-		   ok <- resolveObjs
-		   if ok then putStrLn "done."
-	      		 else throwDyn (InstallationError "linking extra libraries/objects failed")
-     where
-        preloadLib :: [String] -> LibrarySpec -> IO ()
-        preloadLib lib_paths lib_spec
-           = do putStr ("Loading object " ++ showLS lib_spec ++ " ... ")
-                case lib_spec of
-                   Left static_ish
-                      -> do b <- preload_static lib_paths static_ish
-                            putStrLn (if b then "done." else "not found")
-                   Right 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 b <- preload_dynamic (lib_paths++[""]) dll_unadorned
-                            when (not b) (cantFind lib_paths lib_spec)
-                            putStrLn "done"
-
-        cantFind :: [String] -> LibrarySpec -> IO ()
-        cantFind paths spec
-           = do putStr ("failed.\nCan't find " ++ showLS spec
-                        ++ " in directories:\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
-
-        preload_dynamic [] name
-           = return False
-        preload_dynamic (path:paths) rootname
-           = do maybe_errmsg <- addDLL path rootname
-                if    maybe_errmsg /= nullPtr
-                 then preload_dynamic paths rootname
-                 else return True
-
-        give_up 
-           = (throwDyn . CmdLineError)
-                "user specified .o/.so/.DLL could not be loaded."
-
--- Packages that don't need loading, because the compiler shares them with
--- the interpreted program.
-dont_load_these = [ "gmp", "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
-
-linkPackage :: PackageConfig -> IO ()
-linkPackage pkg
-   | name pkg `elem` dont_load_these = return ()
-   | otherwise
-   = do 
-        -- For each obj, try obj.o and if that fails, obj.so.
-        -- Complication: all the .so's must be loaded before any of the .o's.  
-        let dirs      =  library_dirs pkg
-        let objs      =  hs_libraries pkg ++ extra_libraries pkg
-        classifieds   <- mapM (locateOneObj dirs) objs
-
-	-- Don't load the .so libs if this is a package GHCi is already
-	-- linked against, because we'll already have the .so linked in.
-	let (so_libs, obj_libs) = partition isRight classifieds
-        let sos_first | name pkg `elem` loaded_in_ghci = obj_libs
-		      | otherwise      		       = so_libs ++ obj_libs
-
-	putStr ("Loading package " ++ name pkg ++ " ... ")
-        mapM loadClassified sos_first
-        putStr "linking ... "
-        ok <- resolveObjs
-	if ok then putStrLn "done."
-	      else panic ("can't load package `" ++ name pkg ++ "'")
-     where
-        isRight (Right _) = True
-        isRight (Left _)  = False
-
-loadClassified :: LibrarySpec -> IO ()
-loadClassified (Left obj_absolute_filename)
-   = do loadObj obj_absolute_filename
-loadClassified (Right dll_unadorned)
-   = do maybe_errmsg <- addDLL "" dll_unadorned -- doesn't seem right to me
-        if    maybe_errmsg == nullPtr
-         then return ()
-         else do str <- peekCString maybe_errmsg
-                 throwDyn (CmdLineError ("can't load .so/.DLL for: " 
-                                       ++ dll_unadorned ++ " (" ++ str ++ ")" ))
-
-locateOneObj :: [FilePath] -> String -> IO LibrarySpec
-locateOneObj []     obj 
-   = return (Right obj) -- we assume
-locateOneObj (d:ds) obj 
-   = do let path = d ++ '/':obj ++ ".o"
-        b <- doesFileExist path
-        if b then return (Left path) else locateOneObj ds obj
-
------------------------------------------------------------------------------
 -- timing & statistics
 
 timeIt :: GHCi a -> GHCi a
@@ -924,7 +1011,7 @@ timeIt action
 		  io $ printTimes (allocs2 - allocs1) (time2 - time1)
 		  return a
 
-foreign import "getAllocations" getAllocations :: IO Int
+foreign import ccall "getAllocations" getAllocations :: IO Int
 
 printTimes :: Int -> Integer -> IO ()
 printTimes allocs psecs
@@ -937,4 +1024,24 @@ printTimes allocs psecs
 -----------------------------------------------------------------------------
 -- 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