+{-# OPTIONS -#include "Linker.h" #-}
-----------------------------------------------------------------------------
--- $Id: InteractiveUI.hs,v 1.10 2000/11/21 16:42:58 simonmar Exp $
+-- $Id: InteractiveUI.hs,v 1.185 2005/01/28 12:55:23 simonmar Exp $
--
-- GHC Interactive User Interface
--
--- (c) The GHC Team 2000
+-- (c) The GHC Team 2004
--
-----------------------------------------------------------------------------
-
-module InteractiveUI (interactiveUI) where
+module InteractiveUI (
+ interactiveUI, -- :: CmState -> [FilePath] -> IO ()
+ ghciWelcomeMsg
+ ) where
#include "HsVersions.h"
import CompManager
-import CmStaticInfo
+import HscTypes ( HomeModInfo(hm_linkable), HomePackageTable,
+ isObjectLinkable, GhciMode(..) )
+import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecls(..), IfaceConDecl(..),
+ IfaceInst(..), pprIfaceDeclHead, pprParendIfaceType, pprIfaceForAllPart )
+import FunDeps ( pprFundeps )
import DriverFlags
-import DriverUtil
import DriverState
-import Linker
-import Module
-import Outputable
-import Panic
+import DriverUtil ( remove_spaces )
+import Linker ( showLinkerState, linkPackages )
import Util
+import Name ( Name, NamedThing(..) )
+import OccName ( OccName, isSymOcc, occNameUserString )
+import BasicTypes ( StrictnessMark(..), defaultFixity, SuccessFlag(..) )
+import Outputable
+import CmdLineOpts ( DynFlag(..), DynFlags(..), dopt_unset )
+import Panic hiding ( showException )
+import Config
+import SrcLoc ( SrcLoc, isGoodSrcLoc )
-import Exception
-import Readline
-import IOExts
+#ifndef mingw32_HOST_OS
+import DriverUtil( handle )
+import System.Posix
+#if __GLASGOW_HASKELL__ > 504
+ hiding (getEnv)
+#endif
+#endif
+
+#ifdef USE_READLINE
+import Control.Concurrent ( yield ) -- Used in readline loop
+import System.Console.Readline as Readline
+#endif
-import System
-import Directory
-import IO
-import Char
+--import SystemExts
+
+import Control.Exception as Exception
+import Data.Dynamic
+import Control.Concurrent
+
+import Numeric
+import Data.List
+import Data.Int ( Int64 )
+import System.Cmd
+import System.CPUTime
+import System.Environment
+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\
-\(| || || (| |) GHC Interactive, version 5.00 \n\
-\|| __ ||___|| || () For Haskell 98. \n\
-\|| |) ||---|| || || http://www.haskell.org/ghc \n\
-\|| || || || || (| Bug reports to: glasgow-haskell-bugs@haskell.org \n\
-\(|___|| || || (|__|) \\\\______________________________________________________\n"
-
-commands :: [(String, String -> GHCi ())]
-commands = [
- ("cd", changeDirectory),
- ("help", help),
- ("?", help),
- ("load", loadModule),
- ("reload", reloadModule),
- ("set", setOptions),
- ("type", typeOfExpr),
+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", keepGoingPaths addModule),
+ ("browse", keepGoing browseCmd),
+ ("cd", keepGoing changeDirectory),
+ ("def", keepGoing defineMacro),
+ ("help", keepGoing help),
+ ("?", keepGoing help),
+ ("info", keepGoing info),
+ ("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)
]
+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"
-helpText = "\
-\ <expr> evaluate <expr>\n\
-\ :cd <dir> change directory to <dir>\n\
-\ :help display this list of commands\n\
-\ :? display this list of commands\n\
-\ :load <filename> load a module (and it dependents)\n\
-\ :reload reload the current program\n\
-\ :set <opetion> ... set options\n\
-\ :type <expr> show the type of <expr>\n\
-\ :quit exit GHCi\n\
-\ :!<command> run the shell command <command>\n\
-\"
-
-interactiveUI :: CmState -> IO ()
-interactiveUI st = do
- hPutStrLn stdout ghciWelcomeMsg
+-- 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" ++
+ " :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
- -- link in the available packages
- pkgs <- getPackageInfo
- linkPackages (reverse pkgs)
+ -- 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
+
+ -- initial context is just the Prelude
+ cmstate <- cmSetContext cmstate [] ["Prelude"]
-#ifndef NO_READLINE
+#ifdef USE_READLINE
Readline.initialize
#endif
- _ <- (unGHCi uiLoop) GHCiState{ modules = [],
- current_module = defaultCurrentModule,
- target = Nothing,
- cmstate = st }
+
+ startGHCi (runGHCi srcs dflags maybe_expr)
+ GHCiState{ progname = "<interactive>",
+ args = [],
+ targets = srcs,
+ cmstate = cmstate,
+ options = [] }
+
+#ifdef USE_READLINE
+ Readline.resetTerminal Nothing
+#endif
+
return ()
-uiLoop :: GHCi ()
-uiLoop = do
- st <- getGHCiState
-#ifndef NO_READLINE
- l <- io (readline (moduleNameUserString (current_module st) ++ "> "))
+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
+ -- 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
+
+ when (read_dot_files) $ 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
+ let file = dir ++ "/.ghci"
+ ok <- io (checkPerms file)
+ when ok $ do
+ either_hdl <- io (IO.try (openFile file ReadMode))
+ case either_hdl of
+ Left e -> return ()
+ Right hdl -> fileLoop hdl False
+
+ -- 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 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
+
+ -- read commands from stdin
+#ifdef USE_READLINE
+ if (is_tty)
+ then readlineLoop
+ else fileLoop stdin show_prompt
+#else
+ fileLoop stdin show_prompt
+#endif
+
+
+-- 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 . is owned by the current user
+-- and isn'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 =
+#ifdef mingw32_HOST_OS
+ return True
#else
- l <- io (hGetLine stdin)
+ DriverUtil.handle (\_ -> return False) $ do
+ 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
- case l of
- Nothing -> exitGHCi
- Just "" -> uiLoop
- Just l -> do
-#ifndef NO_READLINE
- io (addHistory l)
+
+fileLoop :: Handle -> Bool -> GHCi ()
+fileLoop hdl prompt = do
+ 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 ()
+ | 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
+ l -> do quit <- runCommand l
+ if quit then return () else fileLoop hdl prompt
+
+stringLoop :: [String] -> GHCi ()
+stringLoop [] = return ()
+stringLoop (s:ss) = do
+ 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)) ++ "> "
+
+#ifdef USE_READLINE
+readlineLoop :: GHCi ()
+readlineLoop = do
+ cmstate <- getCmState
+ (mod,imports) <- io (cmGetContext cmstate)
+ io yield
+ 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 ->
+ case remove_spaces l of
+ "" -> readlineLoop
+ l -> do
+ io (addHistory l)
+ quit <- runCommand l
+ if quit then return () else readlineLoop
#endif
- runCommand l
- uiLoop
-
-exitGHCi = io $ do putStrLn "Leaving GHCi."; exitWith ExitSuccess
-
--- Top level exception handler, just prints out the exception
--- and carries on.
-runCommand c =
- ghciHandle ( \other_exception ->io (putStrLn (show other_exception) )) $
- ghciHandleDyn
- (\dyn -> case dyn of
- PhaseFailed phase code ->
- io ( putStrLn ("Phase " ++ phase ++ " failed (code "
- ++ show code ++ ")"))
- Interrupted -> io (putStrLn "Interrupted.")
- _ -> io (putStrLn (show (dyn :: BarfKind)))
- ) $
- doCommand c
+
+runCommand :: String -> GHCi Bool
+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 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))
doCommand (':' : command) = specialCommand command
-doCommand expr
+doCommand stmt
+ = do timeIt (do nms <- runStmt stmt; finishEvalExpr nms)
+ return False
+
+runStmt :: String -> GHCi [Name]
+runStmt stmt
+ | null (filter (not.isSpace) stmt) = return []
+ | otherwise
= do st <- getGHCiState
- dflags <- io (getDynFlags)
- (new_cmstate, maybe_hvalue) <-
- io (cmGetExpr (cmstate st) dflags (current_module st) expr)
+ cmstate <- getCmState
+ (new_cmstate, result) <-
+ io $ withProgName (progname st) $ withArgs (args st) $
+ cmRunStmt cmstate stmt
setGHCiState st{cmstate = new_cmstate}
- case maybe_hvalue of
- Nothing -> return ()
- Just hv -> io (cmRunExpr hv)
-{-
- let (mod,'.':str) = break (=='.') expr
- case cmLookupSymbol (mkOrig varName (mkModuleName mod) (_PK_ str)) (cmstate st) of
- Nothing -> io (putStrLn "nothing.")
- Just e -> io (
- return ()
--}
+ case result of
+ CmRunFailed -> return []
+ CmRunException e -> showException e >> return []
+ CmRunOk names -> return names
+
+-- possibly print the type and revert CAFs after evaluating an expression
+finishEvalExpr names
+ = do b <- isOptionSet ShowType
+ cmstate <- getCmState
+ when b (mapM_ (showTypeOfName cmstate) names)
+
+ flushInterpBuffers
+ io installSignalHandlers
+ b <- isOptionSet RevertCAFs
+ io (when b revertCAFs)
+ return True
+showTypeOfName :: CmState -> Name -> GHCi ()
+showTypeOfName cmstate n
+ = do maybe_str <- io (cmTypeOfName cmstate n)
+ case maybe_str of
+ Nothing -> return ()
+ Just str -> io (putStrLn (showSDoc (ppr n) ++ " :: " ++ str))
+
+specialCommand :: String -> GHCi Bool
specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
specialCommand str = do
let (cmd,rest) = break isSpace str
- case [ (s,f) | (s,f) <- commands, prefixMatch cmd s ] of
- [] -> io $ hPutStr stdout ("uknown command `:" ++ cmd ++ "'\n"
- ++ shortHelpText)
+ cmds <- io (readIORef commands)
+ case [ (s,f) | (s,f) <- cmds, prefixMatch cmd s ] of
+ [] -> io (hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n"
+ ++ shortHelpText) >> return False)
[(_,f)] -> f (dropWhile isSpace rest)
- cs -> io $ hPutStrLn stdout ("prefix " ++ cmd ++
- " matches multiple commands (" ++
+ cs -> io (hPutStrLn stdout ("prefix " ++ cmd ++
+ " matches multiple commands (" ++
foldr1 (\a b -> a ++ ',':b) (map fst cs)
- ++ ")")
+ ++ ")") >> return False)
+
+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
-noArgs c = io (hPutStrLn stdout ("command `:" ++ c ++ "' takes no arguments"))
+ return ()
+
+
+flushInterpBuffers :: GHCi ()
+flushInterpBuffers
+ = io $ do Monad.join (readIORef flush_interp)
+ return ()
+
+turnOffBuffering :: IO ()
+turnOffBuffering
+ = do Monad.join (readIORef turn_off_buffering)
+ return ()
-----------------------------------------------------------------------------
-- Commands
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
+ ; mapM_ (infoThing init_cms) names }
+ where
+ infoThing cms name
+ = do { stuff <- io (cmGetInfo cms name)
+ ; io (putStrLn (showSDocForUser (cmGetPrintUnqual cms) $
+ vcat (intersperse (text "") (map showThing stuff)))) }
+
+showThing :: GetInfoResult -> SDoc
+showThing (wanted_str, (thing, fixity, src_loc, insts))
+ = vcat [ showDecl want_name thing,
+ show_fixity fixity,
+ show_loc src_loc,
+ vcat (map show_inst insts)]
+ where
+ want_name occ = wanted_str == occNameUserString occ
+
+ show_fixity fix
+ | fix == defaultFixity = empty
+ | otherwise = ppr fix <+> text wanted_str
+
+ 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("--")
+
+ show_inst (iface_inst, loc)
+ = hang (ptext SLIT("instance") <+> ppr (ifInstHead iface_inst))
+ 2 (char '\t' <> show_loc loc)
+ -- The tab tries to make them line up a bit
+
+-- 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 :: (OccName -> Bool) -> IfaceDecl -> SDoc
+showDecl want_name (IfaceForeign {ifName = tc})
+ = ppr tc <+> ptext SLIT("is a foreign type")
+
+showDecl want_name (IfaceId {ifName = var, ifType = ty})
+ = ppr var <+> dcolon <+> ppr ty
+
+showDecl want_name (IfaceSyn {ifName = tycon, ifTyVars = tyvars, ifSynRhs = mono_ty})
+ = hang (ptext SLIT("type") <+> pprIfaceDeclHead [] tycon tyvars)
+ 2 (equals <+> ppr mono_ty)
+
+showDecl 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 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 <+> ppr ty)
+ | otherwise = Nothing
+
+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 :: [FilePath] -> GHCi ()
+addModule files = do
+ state <- getGHCiState
+ io (revertCAFs) -- always revert CAFs on load/add.
+ files <- mapM expandPath files
+ let new_targets = files ++ targets state
+ 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 = io . setCurrentDirectory
+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)
-loadModule :: String -> GHCi ()
-loadModule path = do
+defineMacro :: String -> GHCi ()
+defineMacro s = do
+ let (macro_name, definition) = break isSpace s
+ cmds <- io (readIORef commands)
+ if (null macro_name)
+ then throwDyn (CmdLineError "invalid macro name")
+ else do
+ if (macro_name `elem` map fst cmds)
+ then throwDyn (CmdLineError
+ ("command '" ++ macro_name ++ "' is already defined"))
+ else do
+
+ -- give the expression a type signature, so we can be sure we're getting
+ -- something of the right type.
+ let new_expr = '(' : definition ++ ") :: String -> IO String"
+
+ -- compile the expression
+ cms <- getCmState
+ maybe_hv <- io (cmCompileExpr cms new_expr)
+ case maybe_hv of
+ Nothing -> return ()
+ Just hv -> io (writeIORef commands --
+ ((macro_name, keepGoing (runMacro hv)) : cmds))
+
+runMacro :: HValue{-String -> IO String-} -> String -> GHCi ()
+runMacro fun s = do
+ str <- io ((unsafeCoerce# fun :: String -> IO String) s)
+ stringLoop (lines str)
+
+undefineMacro :: String -> GHCi ()
+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"))
+ else do
+ if (macro_name `notElem` map fst cmds)
+ then throwDyn (CmdLineError
+ ("command '" ++ macro_name ++ "' not defined"))
+ else do
+ io (writeIORef commands (filter ((/= macro_name) . fst) cmds))
+
+
+loadModule :: [FilePath] -> GHCi ()
+loadModule fs = timeIt (loadModule' fs)
+
+loadModule' :: [FilePath] -> GHCi ()
+loadModule' files = do
state <- getGHCiState
- (new_cmstate, ok, mods) <- io (cmLoadModule (cmstate state) path)
-
- let new_state = GHCiState {
- cmstate = new_cmstate,
- modules = mods,
- current_module = case mods of
- [] -> defaultCurrentModule
- xs -> last xs,
- target = Just path
- }
- setGHCiState new_state
-
- let mod_commas
- | null mods = text "none."
- | otherwise = hsep (
- punctuate comma (map (text.moduleNameUserString) mods)) <> text "."
- case ok of
- False ->
- io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
- True ->
- io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
+
+ -- 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 (cmLoadModules cmstate1 graph)
+ setGHCiState state{ cmstate = cmstate2, targets = files }
+
+ setContextAfterLoad mods
+ dflags <- getDynFlags
+ modulesLoadedMsg ok mods dflags
+
reloadModule :: String -> GHCi ()
reloadModule "" = do
state <- getGHCiState
- case target state of
- Nothing -> io (putStr "no current target\n")
- Just path -> do (new_cmstate, ok, mod)
- <- io (cmLoadModule (cmstate state) path)
- setGHCiState state{cmstate=new_cmstate}
+ 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) paths)
+
+ io (revertCAFs) -- always revert CAFs on reload.
+ (cmstate1, ok, mods)
+ <- io (cmLoadModules (cmstate state) graph)
+ setGHCiState state{ cmstate=cmstate1 }
+ setContextAfterLoad mods
+ dflags <- 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 dflags =
+ when (verbosity dflags > 0) $ do
+ let mod_commas
+ | null mods = text "none."
+ | otherwise = hsep (
+ punctuate comma (map text mods)) <> text "."
+ case ok of
+ Failed ->
+ io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
+ Succeeded ->
+ io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
+
+
+typeOfExpr :: String -> GHCi ()
+typeOfExpr str
+ = do cms <- getCmState
+ 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)
+
+quit :: String -> GHCi Bool
+quit _ = return True
+
+shellEscape :: String -> GHCi Bool
+shellEscape str = io (system str >> return False)
+
+-----------------------------------------------------------------------------
+-- Browsing 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 (showDecl (const True)) 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'
+
-- set options in the interpreter. Syntax is exactly the same as the
-- ghc command line, except that certain options aren't available (-C,
-- -E etc.)
--
-- This is pretty fragile: most options won't work as expected. ToDo:
-- figure out which ones & disallow them.
-setOptions :: String -> GHCi ()
-setOptions str =
- io (do leftovers <- processArgs static_flags (words str) []
- 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 (OtherError ("unrecognised flags: " ++
+
+setCmd :: String -> GHCi ()
+setCmd ""
+ = do st <- getGHCiState
+ let opts = options st
+ io $ putStrLn (showSDoc (
+ text "options currently set: " <>
+ if null opts
+ then text "none."
+ else hsep (map (\o -> char '+' <> text (optToStr o)) opts)
+ ))
+setCmd str
+ = case words str of
+ ("args":args) -> setArgs args
+ ("prog":prog) -> setProg prog
+ wds -> setOptions wds
+
+setArgs args = do
+ st <- getGHCiState
+ setGHCiState st{ args = args }
+
+setProg [prog] = do
+ st <- getGHCiState
+ setGHCiState st{ progname = prog }
+setProg _ = do
+ io (hPutStrLn stderr "syntax: :set prog <progname>")
+
+setOptions wds =
+ do -- first, deal with the GHCi opts (+s, +t, etc.)
+ let (plus_opts, minus_opts) = partition isPlus wds
+ mapM_ setOpt plus_opts
+
+ -- now, the GHC flags
+ leftovers <- io $ processStaticFlags minus_opts
+
+ -- then, dynamic flags
+ 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 ()
- )
-typeOfExpr :: String -> GHCi ()
-typeOfExpr str
- = do st <- getGHCiState
- dflags <- io (getDynFlags)
- (st, maybe_ty) <- io (cmTypeExpr (cmstate st) dflags
- (current_module st) str)
- case maybe_ty of
- Nothing -> return ()
- Just ty -> io (putStrLn (showSDoc (ppr ty)))
-quit :: String -> GHCi ()
-quit _ = exitGHCi
+unsetOptions :: String -> GHCi ()
+unsetOptions 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_ unsetOpt plus_opts
+
+ -- can't do GHC flags for now
+ if (not (null minus_opts))
+ then throwDyn (CmdLineError "can't unset GHC command-line flags")
+ else return ()
+
+isMinus ('-':s) = True
+isMinus _ = False
+
+isPlus ('+':s) = True
+isPlus _ = False
+
+setOpt ('+':str)
+ = case strToGHCiOpt str of
+ Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
+ Just o -> setOption o
+
+unsetOpt ('+':str)
+ = case strToGHCiOpt str of
+ Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
+ Just o -> unsetOption o
+
+strToGHCiOpt :: String -> (Maybe GHCiOption)
+strToGHCiOpt "s" = Just ShowTiming
+strToGHCiOpt "t" = Just ShowType
+strToGHCiOpt "r" = Just RevertCAFs
+strToGHCiOpt _ = Nothing
+
+optToStr :: GHCiOption -> String
+optToStr ShowTiming = "s"
+optToStr ShowType = "t"
+optToStr RevertCAFs = "r"
+
+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 []
+
+-- ---------------------------------------------------------------------------
+-- 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 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 (getName b)))
+
+ io (mapM_ showBinding (cmGetBindings cms))
+ return ()
-shellEscape :: String -> GHCi ()
-shellEscape str = io (system str >> return ())
-----------------------------------------------------------------------------
-- GHCi monad
data GHCiState = GHCiState
{
- modules :: [ModuleName],
- current_module :: ModuleName,
- target :: Maybe FilePath,
- cmstate :: CmState
+ progname :: String,
+ args :: [String],
+ targets :: [FilePath],
+ cmstate :: CmState,
+ options :: [GHCiOption]
}
-defaultCurrentModule = mkModuleName "Prelude"
+data GHCiOption
+ = ShowTiming -- show time/allocs after evaluation
+ | ShowType -- show the type of expressions
+ | RevertCAFs -- revert CAFs after every evaluation
+ deriving Eq
+
+newtype GHCi a = GHCi { unGHCi :: IORef GHCiState -> IO a }
-newtype GHCi a = GHCi { unGHCi :: GHCiState -> IO (GHCiState, 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,())
+ghciHandleDyn :: Typeable t => (t -> GHCi a) -> GHCi a -> GHCi a
+ghciHandleDyn h (GHCi m) = GHCi $ \s ->
+ Exception.catchDyn (m s) (\e -> unGHCi (h e) 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}
+
+getDynFlags = getCmState >>= return . cmGetDFlags
+
+setDynFlags dflags = do s <- getCmState; setCmState (cmSetDFlags s dflags)
+
+isOptionSet :: GHCiOption -> GHCi Bool
+isOptionSet opt
+ = do st <- getGHCiState
+ return (opt `elem` options st)
-io m = GHCi $ \s -> m >>= \a -> return (s,a)
+setOption :: GHCiOption -> GHCi ()
+setOption opt
+ = do st <- getGHCiState
+ setGHCiState (st{ options = opt : filter (/= opt) (options st) })
+
+unsetOption :: GHCiOption -> GHCi ()
+unsetOption opt
+ = do st <- getGHCiState
+ setGHCiState (st{ options = filter (/= opt) (options st) })
+
+io :: IO a -> GHCi a
+io m = GHCi { unGHCi = \s -> m >>= return }
+
+-----------------------------------------------------------------------------
+-- recursive exception handlers
+-- Don't forget to unblock async exceptions in the handler, or if we're
+-- in an exception loop (eg. let a = error a in a) the ^C exception
+-- may never be delivered. Thanks to Marcin for pointing out the bug.
+
+ghciHandle :: (Exception -> GHCi a) -> GHCi a -> GHCi a
ghciHandle h (GHCi m) = GHCi $ \s ->
- Exception.catch (m s) (\e -> unGHCi (h e) s)
-ghciHandleDyn h (GHCi m) = GHCi $ \s ->
- Exception.catchDyn (m s) (\e -> unGHCi (h e) s)
+ Exception.catch (m s)
+ (\e -> unGHCi (ghciUnblock (h e)) s)
+
+ghciUnblock :: GHCi a -> GHCi a
+ghciUnblock (GHCi a) = GHCi $ \s -> Exception.unblock (a s)
+
+-----------------------------------------------------------------------------
+-- timing & statistics
+
+timeIt :: GHCi a -> GHCi a
+timeIt action
+ = do b <- isOptionSet ShowTiming
+ if not b
+ then action
+ else do allocs1 <- io $ getAllocations
+ time1 <- io $ getCPUTime
+ a <- action
+ allocs2 <- io $ getAllocations
+ time2 <- io $ getCPUTime
+ io $ printTimes (fromIntegral (allocs2 - allocs1))
+ (time2 - time1)
+ return a
+
+foreign import ccall unsafe "getAllocations" getAllocations :: IO Int64
+ -- defined in ghc/rts/Stats.c
+
+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 <+>
+ text (show allocs) <+> text "bytes")))
-----------------------------------------------------------------------------
--- package loader
-
-linkPackages :: [Package] -> IO ()
-linkPackages pkgs = mapM_ linkPackage pkgs
-
-linkPackage :: Package -> IO ()
--- ignore rts and gmp for now (ToDo; better?)
-linkPackage pkg | name pkg `elem` ["rts", "gmp"] = return ()
-linkPackage pkg = do
- putStr ("Loading package " ++ name pkg ++ " ... ")
- let dirs = library_dirs pkg
- let objs = map (++".o") (hs_libraries pkg ++ extra_libraries pkg)
- mapM (linkOneObj dirs) objs
- putStr "resolving ... "
- resolveObjs
- putStrLn "done."
-
-linkOneObj dirs obj = do
- filename <- findFile dirs obj
- loadObj filename
-
-findFile [] obj = throwDyn (OtherError ("can't find " ++ obj))
-findFile (d:ds) obj = do
- let path = d ++ '/':obj
- b <- doesFileExist path
- if b then return path else findFile ds obj
+-- reverting CAFs
+
+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
projects / ghc-hetmet.git / blobdiff