{-# OPTIONS -#include "Linker.h" #-}
-----------------------------------------------------------------------------
--- $Id: InteractiveUI.hs,v 1.173 2004/08/13 13:06:42 simonmar Exp $
+-- $Id: InteractiveUI.hs,v 1.185 2005/01/28 12:55:23 simonmar Exp $
--
-- GHC Interactive User Interface
--
ghciWelcomeMsg
) where
-#include "../includes/ghcconfig.h"
#include "HsVersions.h"
import CompManager
-import HscTypes ( TyThing(..), HomeModInfo(hm_linkable), HomePackageTable,
+import HscTypes ( HomeModInfo(hm_linkable), HomePackageTable,
isObjectLinkable, GhciMode(..) )
-import IfaceSyn ( IfaceType, IfaceDecl(..), IfaceClassOp(..), IfaceConDecls(..), IfaceConDecl(..),
- pprIfaceDeclHead, pprParendIfaceType, pprIfaceForAllPart )
+import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecls(..), IfaceConDecl(..),
+ IfaceInst(..), pprIfaceDeclHead, pprParendIfaceType, pprIfaceForAllPart )
import FunDeps ( pprFundeps )
import DriverFlags
import DriverState
import DriverUtil ( remove_spaces )
import Linker ( showLinkerState, linkPackages )
import Util
-import Module ( showModMsg, lookupModuleEnv )
-import Name ( Name, isHomePackageName, nameSrcLoc, nameOccName,
- NamedThing(..) )
+import Name ( Name, NamedThing(..) )
import OccName ( OccName, isSymOcc, occNameUserString )
-import BasicTypes ( StrictnessMark(..), Fixity, defaultFixity, SuccessFlag(..) )
-import Packages
+import BasicTypes ( StrictnessMark(..), defaultFixity, SuccessFlag(..) )
import Outputable
-import CmdLineOpts ( DynFlag(..), DynFlags(..), getDynFlags, saveDynFlags,
- restoreDynFlags, dopt_unset )
+import CmdLineOpts ( DynFlag(..), DynFlags(..), dopt_unset )
import Panic hiding ( showException )
import Config
import SrcLoc ( SrcLoc, isGoodSrcLoc )
#endif
#endif
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
import Control.Concurrent ( yield ) -- Used in readline loop
import System.Console.Readline as Readline
#endif
import System.CPUTime
import System.Environment
import System.Directory
-import System.IO as IO
+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 )
" (eg. -v2, -fglasgow-exts, etc.)\n"
-interactiveUI :: [FilePath] -> Maybe String -> IO ()
-interactiveUI srcs maybe_expr = do
- dflags <- getDynFlags
+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
-- initial context is just the Prelude
cmstate <- cmSetContext cmstate [] ["Prelude"]
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
Readline.initialize
#endif
cmstate = cmstate,
options = [] }
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
Readline.resetTerminal Nothing
#endif
_other -> return ()) $ do
-- read commands from stdin
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
if (is_tty)
then readlineLoop
else fileLoop stdin show_prompt
when prompt (io (putStr (mkPrompt mod imports)))
l <- io (IO.try (hGetLine hdl))
case l of
- Left e | isEOFError e -> return ()
- | otherwise -> io (ioError e)
+ Left e | isEOFError e -> return ()
+ | InvalidArgument <- etype -> return ()
+ | otherwise -> io (ioError e)
+ where etype = ioeGetErrorType e
+ -- treat InvalidArgument in the same way as EOF:
+ -- this can happen if the user closed stdin, or
+ -- perhaps did getContents which closes stdin at
+ -- EOF.
Right l ->
case remove_spaces l of
"" -> fileLoop hdl prompt
mkPrompt toplevs exports
= concat (intersperse " " (map ('*':) toplevs ++ exports)) ++ "> "
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
readlineLoop :: GHCi ()
readlineLoop = do
cmstate <- getCmState
| null (filter (not.isSpace) stmt) = return []
| otherwise
= do st <- getGHCiState
- dflags <- io getDynFlags
- let cm_state' = cmSetDFlags (cmstate st)
- (dopt_unset dflags Opt_WarnUnusedBinds)
+ cmstate <- getCmState
(new_cmstate, result) <-
io $ withProgName (progname st) $ withArgs (args st) $
- cmRunStmt cm_state' stmt
+ cmRunStmt cmstate stmt
setGHCiState st{cmstate = new_cmstate}
case result of
CmRunFailed -> return []
; mapM_ (infoThing init_cms) names }
where
infoThing cms name
- = do { stuff <- io (cmInfoThing cms name)
+ = do { stuff <- io (cmGetInfo cms name)
; io (putStrLn (showSDocForUser (cmGetPrintUnqual cms) $
- vcat (intersperse (text "") (map (showThing name) stuff)))) }
-
-showThing :: String -> (IfaceDecl, Fixity, SrcLoc) -> SDoc
-showThing name (thing, fixity, src_loc)
- = vcat [ showDecl (\occ -> name == occNameUserString occ) thing,
- showFixity fixity,
- text "-- " <> showLoc src_loc]
+ 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
- showFixity fix
+ want_name occ = wanted_str == occNameUserString occ
+
+ show_fixity fix
| fix == defaultFixity = empty
- | otherwise = ppr fix <+> text name
+ | otherwise = ppr fix <+> text wanted_str
- showLoc loc -- The ppr function for SrcLocs is a bit wonky
- | isGoodSrcLoc loc = ptext SLIT("Defined at") <+> ppr loc
- | otherwise = ppr loc
+ 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.
= hang (ptext SLIT("type") <+> pprIfaceDeclHead [] tycon tyvars)
2 (equals <+> ppr mono_ty)
-showDecl want_name (IfaceData {ifCtxt = context, ifName = tycon,
+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 (IfaceConDecl con_name is_infix ex_tvs ex_cxt tys strs flds)
+ 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 (pprIfaceForAllPart ex_tvs ex_cxt (show_guts con_name is_infix tys_w_strs 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)
= Just (ppr_bndr fld <+> dcolon <+> ppr_bangty bty)
| otherwise = Nothing
- (pp_nd, cs) = case condecls of
- IfAbstractTyCon -> (ptext SLIT("data"), [])
- IfDataTyCon cs -> (ptext SLIT("data"), cs)
- IfNewTyCon c -> (ptext SLIT("newtype"), [c])
+ (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
(cmstate1, ok, mods) <- io (cmLoadModules (cmstate state) graph)
setGHCiState state{ cmstate = cmstate1, targets = new_targets }
setContextAfterLoad mods
- dflags <- io getDynFlags
+ dflags <- getDynFlags
modulesLoadedMsg ok mods dflags
changeDirectory :: String -> GHCi ()
setGHCiState state{ cmstate = cmstate2, targets = files }
setContextAfterLoad mods
- dflags <- io (getDynFlags)
+ dflags <- getDynFlags
modulesLoadedMsg ok mods dflags
<- io (cmLoadModules (cmstate state) graph)
setGHCiState state{ cmstate=cmstate1 }
setContextAfterLoad mods
- dflags <- io getDynFlags
+ dflags <- getDynFlags
modulesLoadedMsg ok mods dflags
reloadModule _ = noArgs ":reload"
mapM_ setOpt plus_opts
-- now, the GHC flags
- pkgs_before <- io (readIORef v_ExplicitPackages)
- leftovers <- io (processArgs static_flags minus_opts [])
- pkgs_after <- io (readIORef v_ExplicitPackages)
-
- -- update things if the users wants more packages
- 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 [])
+ leftovers <- io $ processStaticFlags minus_opts
-- then, dynamic flags
- io $ do
- restoreDynFlags
- leftovers <- processArgs dynamic_flags (leftovers ++ pkg_extra_dyn) []
- saveDynFlags
-
- if (not (null leftovers))
+ dflags <- getDynFlags
+ (dflags',leftovers) <- io $ processDynamicFlags leftovers dflags
+ setDynFlags dflags'
+
+ -- update things if the users wants more packages
+{- TODO:
+ let new_packages = pkgs_after \\ pkgs_before
+ when (not (null new_packages)) $
+ newPackages new_packages
+-}
+
+ if (not (null leftovers))
then throwDyn (CmdLineError ("unrecognised flags: " ++
unwords leftovers))
else return ()
state <- getGHCiState
cmstate1 <- io (cmUnload (cmstate state))
setGHCiState state{ cmstate = cmstate1, targets = [] }
- dflags <- io getDynFlags
+ dflags <- getDynFlags
io (linkPackages dflags new_pkgs)
setContextAfterLoad []
["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
+showModules
+ = do { cms <- getCmState
+ ; let show_one ms = io (putStrLn (cmShowModule cms ms))
+ ; mapM_ show_one (cmGetModuleGraph cms) }
showBindings = do
cms <- getCmState
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