-----------------------------------------------------------------------------
--- $Id: InteractiveUI.hs,v 1.64 2001/04/26 11:38:53 qrczak Exp $
+-- $Id: InteractiveUI.hs,v 1.77 2001/06/18 09:09:28 simonmar Exp $
--
-- GHC Interactive User Interface
--
#include "../includes/config.h"
#include "HsVersions.h"
+import Packages
import CompManager
-import CmStaticInfo
+import HscTypes ( GhciMode(..) )
import ByteCodeLink
import DriverFlags
import DriverState
import DriverUtil
import Linker
+import Finder ( flushPackageCache )
import Util
import Name ( Name )
import Outputable
-import CmdLineOpts ( DynFlag(..), dopt_unset )
+import CmdLineOpts ( DynFlag(..), getDynFlags, saveDynFlags, restoreDynFlags, dopt_unset )
import Panic ( GhcException(..) )
import Config
+#ifndef mingw32_TARGET_OS
+import Posix
+#endif
+
import Exception
import Dynamic
#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
ghciWelcomeMsg = "\
\ ___ ___ _\n\
\ / _ \\ /\\ /\\/ __(_)\n\
-\ / /_\\// /_/ / / | | GHC Interactive, version " ++ cProjectVersion ++ ", For Haskell 98.\n\
+\ / /_\\// /_/ / / | | GHC Interactive, version " ++ cProjectVersion ++ ", for Haskell 98.\n\
\/ /_\\\\/ __ / /___| | http://www.haskell.org/ghc/\n\
\\\____/\\/ /_/\\____/|_| Type :? for help.\n"
helpText = "\
\ Commands available from the prompt:\n\
\\
-\ <stmt> evaluate/run <stmt>\n\
-\ :cd <dir> change directory to <dir>\n\
-\ :def <cmd> <expr> define a command :<cmd>\n\
-\ :help, :? display this list of commands\n\
-\ :load <filename> load a module (and it 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\
-\ :undef <name> undefine user-defined command :<name>\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\
+\ <stmt> evaluate/run <stmt>\n\
+\ :cd <dir> change directory to <dir>\n\
+\ :def <cmd> <expr> define a command :<cmd>\n\
+\ :help, :? display this list of commands\n\
+\ :load <filename> load a module (and its 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\
+\ :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\
\\
\ Options for `:set' and `:unset':\n\
\\
-- link in the available packages
pkgs <- getPackageInfo
initLinker
- linkPackages cmdline_libs (reverse pkgs)
+ linkPackages cmdline_libs pkgs
(cmstate, ok, mods) <-
case mod of
Just hval -> writeIORef flush_stdout (unsafeCoerce# hval :: IO ())
_ -> panic "interactiveUI:stdout"
- (unGHCi runGHCi) GHCiState{ target = mod,
- cmstate = cmstate,
- options = [] }
+ startGHCi runGHCi GHCiState{ target = mod,
+ cmstate = cmstate,
+ options = [] }
return ()
runGHCi :: GHCi ()
runGHCi = do
- -- read in ./.ghci
- dot_ghci <- io (IO.try (openFile "./.ghci" ReadMode))
- case dot_ghci of
- Left e -> return ()
- Right hdl -> fileLoop hdl False
+ -- Read in ./.ghci.
+ let file = "./.ghci"
+ exists <- io (doesFileExist file)
+ when exists $ do
+ dir_ok <- io (checkPerms ".")
+ file_ok <- io (checkPerms file)
+ when (dir_ok && file_ok) $ do
+ either_hdl <- io (IO.try (openFile "./.ghci" ReadMode))
+ case either_hdl of
+ Left e -> return ()
+ Right hdl -> fileLoop hdl False
- -- read in ~/.ghci
- home <- io (IO.try (getEnv "HOME"))
- case home of
- Left e -> return ()
- Right dir -> do
+ -- Read in $HOME/.ghci
+ either_dir <- io (IO.try (getEnv "HOME"))
+ case either_dir of
+ Left e -> return ()
+ Right dir -> do
cwd <- io (getCurrentDirectory)
- when (dir /= cwd) $ do
- dot_ghci <- io (IO.try (openFile (dir ++ "/.ghci") ReadMode))
- case dot_ghci of
- Left e -> return ()
- Right hdl -> fileLoop hdl False
+ when (dir /= cwd) $ do
+ let file = dir ++ "/.ghci"
+ ok <- io (checkPerms file)
+ either_hdl <- io (IO.try (openFile file ReadMode))
+ case either_hdl of
+ Left e -> return ()
+ Right hdl -> fileLoop hdl False
-- read commands from stdin
#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
io $ do putStrLn "Leaving GHCi."
+-- NOTE: We only read .ghci files if they are owned by the current user,
+-- and aren't world writable. Otherwise, we could be accidentally
+-- running code planted by a malicious third party.
+
+-- Furthermore, We only read ./.ghci if both . and ./.ghci are
+-- owned by the current user and aren't writable by anyone else. I
+-- think this is sufficient: we don't need to check .. and
+-- ../.. etc. because "." always refers to the same directory while a
+-- process is running.
+
+checkPerms :: String -> IO Bool
+checkPerms name =
+ handle (\_ -> return False) $ do
+#ifdef mingw32_TARGET_OS
+ doesFileExist name
+#else
+ st <- getFileStatus name
+ me <- getRealUserID
+ if fileOwner st /= me then do
+ putStrLn $ "WARNING: " ++ name ++ " is owned by someone else, IGNORING!"
+ return False
+ else do
+ let mode = fileMode st
+ if (groupWriteMode == (mode `intersectFileModes` groupWriteMode))
+ || (otherWriteMode == (mode `intersectFileModes` otherWriteMode))
+ then do
+ putStrLn $ "*** WARNING: " ++ name ++
+ " is writable by someone else, IGNORING!"
+ return False
+ else return True
+#endif
+
fileLoop :: Handle -> Bool -> GHCi ()
fileLoop hdl prompt = do
st <- getGHCiState
-- and carries on.
runCommand :: String -> GHCi Bool
runCommand c =
- ghciHandle ( \exception ->
- (case exception of
- DynException dyn ->
- case fromDynamic dyn of
- Nothing -> io (putStrLn ("*** Exception: (unknown)"))
- Just ghc_ex ->
- case ghc_ex of
- PhaseFailed phase code ->
- io ( putStrLn ("Phase " ++ phase ++ " failed (code "
- ++ show code ++ ")"))
- Interrupted -> io (putStrLn "Interrupted.")
- -- omit the location for CmdLineError
- CmdLineError s -> io (putStrLn s)
- other -> io (putStrLn (show (ghc_ex :: GhcException)))
-
- other -> io (putStrLn ("*** Exception: " ++ show exception))
-
- ) >> return False
- ) $
-
- doCommand c
+ ghciHandle ( \exception -> do
+ flushEverything
+ showException exception
+ return False
+ ) $
+ doCommand c
+
+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))
+showException other_exception
+ = io (putStrLn ("*** Exception: " ++ show other_exception))
doCommand (':' : command) = specialCommand command
doCommand stmt
= return Nothing
| otherwise
= do st <- getGHCiState
- dflags <- io (getDynFlags)
+ dflags <- io getDynFlags
let dflags' = dopt_unset dflags Opt_WarnUnusedBinds
(new_cmstate, names) <- io (cmRunStmt (cmstate st) dflags' stmt)
setGHCiState st{cmstate = new_cmstate}
setContext :: String -> GHCi ()
setContext ""
= throwDyn (CmdLineError "syntax: `:m <module>'")
-setContext m | not (isUpper (head m)) || not (all isAlphaNum (tail m))
+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)
-- compile the expression
st <- getGHCiState
- dflags <- io (getDynFlags)
+ dflags <- io getDynFlags
(new_cmstate, maybe_hv) <- io (cmCompileExpr (cmstate st) dflags new_expr)
setGHCiState st{cmstate = new_cmstate}
case maybe_hv of
loadModule' path = do
state <- getGHCiState
- cmstate1 <- io (cmUnload (cmstate state))
+ dflags <- io getDynFlags
+ cmstate1 <- io (cmUnload (cmstate state) dflags)
+ setGHCiState state{ cmstate = cmstate1, target = Nothing }
io (revertCAFs) -- always revert CAFs on load.
(cmstate2, ok, mods) <- io (cmLoadModule cmstate1 path)
- let new_state = state{ cmstate = cmstate2,
- target = Just path
- }
- setGHCiState new_state
+ setGHCiState state{ cmstate = cmstate2, target = Just path }
modulesLoadedMsg ok mods
reloadModule :: String -> GHCi ()
typeOfExpr :: String -> GHCi ()
typeOfExpr str
= do st <- getGHCiState
- dflags <- io (getDynFlags)
+ dflags <- io getDynFlags
(new_cmstate, maybe_tystr) <- io (cmTypeOfExpr (cmstate st) dflags str)
setGHCiState st{cmstate = new_cmstate}
case maybe_tystr of
))
setOptions str
= do -- first, deal with the GHCi opts (+s, +t, etc.)
- let opts = words str
- (minus_opts, rest1) = partition isMinus opts
- (plus_opts, rest2) = partition isPlus rest1
-
- if (not (null rest2))
- then io (putStrLn ("unknown option: `" ++ head rest2 ++ "'"))
- else do
-
- mapM setOpt plus_opts
-
- -- now, the GHC flags
- io (do -- first, static flags
- leftovers <- processArgs static_flags minus_opts []
-
- -- then, dynamic flags
- dyn_flags <- readIORef v_InitDynFlags
- writeIORef v_DynFlags dyn_flags
- leftovers <- processArgs dynamic_flags leftovers []
- dyn_flags <- readIORef v_DynFlags
- writeIORef v_InitDynFlags dyn_flags
-
- if (not (null leftovers))
- then throwDyn (CmdLineError ("unrecognised flags: " ++
+ let (plus_opts, minus_opts) = partition isPlus (words str)
+ 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)
+
+ -- then, dynamic flags
+ io $ do
+ restoreDynFlags
+ leftovers <- processArgs dynamic_flags leftovers []
+ saveDynFlags
+
+ if (not (null leftovers))
+ then throwDyn (CmdLineError ("unrecognised flags: " ++
unwords leftovers))
- else return ()
- )
+ else return ()
+
unsetOptions :: String -> GHCi ()
unsetOptions str
optToStr ShowType = "t"
optToStr RevertCAFs = "r"
+newPackages new_pkgs = do
+ state <- getGHCiState
+ dflags <- io getDynFlags
+ cmstate1 <- io (cmUnload (cmstate state) dflags)
+ setGHCiState state{ cmstate = cmstate1, target = Nothing }
+
+ io $ do
+ pkgs <- getPackageInfo
+ flushPackageCache pkgs
+
+ new_pkg_info <- getPackageDetails new_pkgs
+ mapM_ (linkPackage False) (reverse new_pkg_info)
+
-----------------------------------------------------------------------------
-- GHCi monad
GLOBAL_VAR(flush_stdout, error "no flush_stdout", IO ())
GLOBAL_VAR(flush_stderr, error "no flush_stdout", IO ())
-newtype GHCi a = GHCi { unGHCi :: GHCiState -> IO (GHCiState, a) }
+newtype GHCi a = GHCi { unGHCi :: IORef GHCiState -> IO a }
+
+startGHCi :: GHCi a -> GHCiState -> IO a
+startGHCi g state = do ref <- newIORef state; unGHCi g ref
instance Monad GHCi where
- (GHCi m) >>= k = GHCi $ \s -> m s >>= \(s,a) -> unGHCi (k a) s
- return a = GHCi $ \s -> return (s,a)
+ (GHCi m) >>= k = GHCi $ \s -> m s >>= \a -> unGHCi (k a) s
+ return a = GHCi $ \s -> return a
-getGHCiState = GHCi $ \s -> return (s,s)
-setGHCiState s = GHCi $ \_ -> return (s,())
+getGHCiState = GHCi $ \r -> readIORef r
+setGHCiState s = GHCi $ \r -> writeIORef r s
isOptionSet :: GHCiOption -> GHCi Bool
isOptionSet opt
= do st <- getGHCiState
setGHCiState (st{ options = filter (/= opt) (options st) })
-io m = GHCi $ \s -> m >>= \a -> return (s,a)
+io m = GHCi $ \s -> m >>= \a -> return a
-----------------------------------------------------------------------------
-- recursive exception handlers
-- e.g. On unix "qt" denotes "libqt.so"
-- On WinDoze "burble" denotes "burble.DLL"
-- addDLL is platform-specific and adds the lib/.so/.DLL
--- prefixes plaform-dependently; we don't do that here.
+-- 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
linkPackages :: [LibrarySpec] -> [PackageConfig] -> IO ()
linkPackages cmdline_lib_specs pkgs
- = do mapM_ linkPackage pkgs
- mapM_ preloadLib cmdline_lib_specs
+ = do sequence_ [ linkPackage (name p `elem` loaded) p | p <- reverse pkgs ]
+ lib_paths <- readIORef v_Library_paths
+ mapM_ (preloadLib lib_paths) cmdline_lib_specs
where
- preloadLib lib_spec
+ -- packages that are already linked into GHCi
+ loaded = [ "gmp", "rts", "std", "concurrent", "posix", "text", "util" ]
+
+ 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 <- doesFileExist static_ish
- if not b
- then do putStr "not found.\n"
- croak
- else do loadObj static_ish
- putStr "done.\n"
+ -> do b <- preload_static lib_paths static_ish
+ putStrLn (if b then "done" else "not found")
Right dll_unadorned
- -> do maybe_errmsg <- addDLL dll_unadorned
- if maybe_errmsg == nullPtr
- then putStr "done.\n"
- else do str <- peekCString maybe_errmsg
- putStr ("failed (" ++ str ++ ")\n")
- croak
-
- croak = throwDyn (CmdLineError "user specified .o/.so/.DLL could not be loaded.")
-
-
-linkPackage :: PackageConfig -> IO ()
+ -> -- 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."
+
+
+linkPackage :: Bool -> PackageConfig -> IO ()
-- ignore rts and gmp for now (ToDo; better?)
-linkPackage pkg
+linkPackage loaded_in_ghci pkg
| name pkg `elem` ["rts", "gmp"]
= return ()
| otherwise
let dirs = library_dirs pkg
let objs = hs_libraries pkg ++ extra_libraries pkg
classifieds <- mapM (locateOneObj dirs) objs
- let sos_first = filter isRight classifieds
- ++ filter (not.isRight) classifieds
+
+ -- 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 | loaded_in_ghci = obj_libs
+ | otherwise = so_libs ++ obj_libs
+
mapM loadClassified sos_first
putStr "linking ... "
resolveObjs
loadClassified (Left obj_absolute_filename)
= do loadObj obj_absolute_filename
loadClassified (Right dll_unadorned)
- = do maybe_errmsg <- addDLL 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
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