1 {-# OPTIONS -#include "Linker.h" #-}
2 -----------------------------------------------------------------------------
4 -- GHC Interactive User Interface
6 -- (c) The GHC Team 2005-2006
8 -----------------------------------------------------------------------------
14 #include "HsVersions.h"
22 import GHC ( Session, LoadHowMuch(..), Target(..), TargetId(..),
23 Type, Module, ModuleName, TyThing(..), Phase,
24 BreakIndex, Name, SrcSpan, Resume, SingleStep )
30 import Outputable hiding (printForUser)
31 import Module -- for ModuleEnv
33 -- Other random utilities
35 import BasicTypes hiding (isTopLevel)
36 import Panic hiding (showException)
43 #ifndef mingw32_HOST_OS
45 #if __GLASGOW_HASKELL__ > 504
49 import GHC.ConsoleHandler ( flushConsole )
50 import System.Win32 ( setConsoleCP, setConsoleOutputCP )
51 import qualified System.Win32
55 import Control.Concurrent ( yield ) -- Used in readline loop
56 import System.Console.Readline as Readline
61 import Control.Exception as Exception
62 -- import Control.Concurrent
64 import qualified Data.ByteString.Char8 as BS
68 import System.Environment
69 import System.Exit ( exitWith, ExitCode(..) )
70 import System.Directory
72 import System.IO.Error as IO
73 import System.FilePath
77 import Control.Monad as Monad
80 import Foreign.StablePtr ( newStablePtr )
81 import GHC.Exts ( unsafeCoerce# )
82 import GHC.IOBase ( IOErrorType(InvalidArgument) )
84 import Data.IORef ( IORef, readIORef, writeIORef )
86 import System.Posix.Internals ( setNonBlockingFD )
88 -----------------------------------------------------------------------------
92 " / _ \\ /\\ /\\/ __(_)\n"++
93 " / /_\\// /_/ / / | | GHC Interactive, version " ++ cProjectVersion ++ ", for Haskell 98.\n"++
94 "/ /_\\\\/ __ / /___| | http://www.haskell.org/ghc/\n"++
95 "\\____/\\/ /_/\\____/|_| Type :? for help.\n"
97 type Command = (String, String -> GHCi Bool, Bool, String -> IO [String])
100 GLOBAL_VAR(commands, builtin_commands, [Command])
102 builtin_commands :: [Command]
104 -- Hugs users are accustomed to :e, so make sure it doesn't overlap
105 ("?", keepGoing help, False, completeNone),
106 ("add", keepGoingPaths addModule, False, completeFilename),
107 ("abandon", keepGoing abandonCmd, False, completeNone),
108 ("break", keepGoing breakCmd, False, completeIdentifier),
109 ("back", keepGoing backCmd, False, completeNone),
110 ("browse", keepGoing browseCmd, False, completeModule),
111 ("cd", keepGoing changeDirectory, False, completeFilename),
112 ("check", keepGoing checkModule, False, completeHomeModule),
113 ("continue", keepGoing continueCmd, False, completeNone),
114 ("cmd", keepGoing cmdCmd, False, completeIdentifier),
115 ("ctags", keepGoing createCTagsFileCmd, False, completeFilename),
116 ("def", keepGoing defineMacro, False, completeIdentifier),
117 ("delete", keepGoing deleteCmd, False, completeNone),
118 ("e", keepGoing editFile, False, completeFilename),
119 ("edit", keepGoing editFile, False, completeFilename),
120 ("etags", keepGoing createETagsFileCmd, False, completeFilename),
121 ("force", keepGoing forceCmd, False, completeIdentifier),
122 ("forward", keepGoing forwardCmd, False, completeNone),
123 ("help", keepGoing help, False, completeNone),
124 ("history", keepGoing historyCmd, False, completeNone),
125 ("info", keepGoing info, False, completeIdentifier),
126 ("kind", keepGoing kindOfType, False, completeIdentifier),
127 ("load", keepGoingPaths loadModule_, False, completeHomeModuleOrFile),
128 ("list", keepGoing listCmd, False, completeNone),
129 ("module", keepGoing setContext, False, completeModule),
130 ("main", keepGoing runMain, False, completeIdentifier),
131 ("print", keepGoing printCmd, False, completeIdentifier),
132 ("quit", quit, False, completeNone),
133 ("reload", keepGoing reloadModule, False, completeNone),
134 ("set", keepGoing setCmd, True, completeSetOptions),
135 ("show", keepGoing showCmd, False, completeNone),
136 ("sprint", keepGoing sprintCmd, False, completeIdentifier),
137 ("step", keepGoing stepCmd, False, completeIdentifier),
138 ("type", keepGoing typeOfExpr, False, completeIdentifier),
139 ("trace", keepGoing traceCmd, False, completeIdentifier),
140 ("undef", keepGoing undefineMacro, False, completeMacro),
141 ("unset", keepGoing unsetOptions, True, completeSetOptions)
144 keepGoing :: (String -> GHCi ()) -> (String -> GHCi Bool)
145 keepGoing a str = a str >> return False
147 keepGoingPaths :: ([FilePath] -> GHCi ()) -> (String -> GHCi Bool)
148 keepGoingPaths a str = a (toArgs str) >> return False
150 shortHelpText = "use :? for help.\n"
153 " Commands available from the prompt:\n" ++
155 " <statement> evaluate/run <statement>\n" ++
156 " :add <filename> ... add module(s) to the current target set\n" ++
157 " :browse [*]<module> display the names defined by <module>\n" ++
158 " :cd <dir> change directory to <dir>\n" ++
159 " :cmd <expr> run the commands returned by <expr>::IO String"++
160 " :ctags [<file>] create tags file for Vi (default: \"tags\")\n" ++
161 " :def <cmd> <expr> define a command :<cmd>\n" ++
162 " :edit <file> edit file\n" ++
163 " :edit edit last module\n" ++
164 " :etags [<file>] create tags file for Emacs (default: \"TAGS\")\n" ++
165 " :help, :? display this list of commands\n" ++
166 " :info [<name> ...] display information about the given names\n" ++
167 " :kind <type> show the kind of <type>\n" ++
168 " :load <filename> ... load module(s) and their dependents\n" ++
169 " :module [+/-] [*]<mod> ... set the context for expression evaluation\n" ++
170 " :main [<arguments> ...] run the main function with the given arguments\n" ++
171 " :quit exit GHCi\n" ++
172 " :reload reload the current module set\n" ++
173 " :type <expr> show the type of <expr>\n" ++
174 " :undef <cmd> undefine user-defined command :<cmd>\n" ++
175 " :!<command> run the shell command <command>\n" ++
177 " -- Commands for debugging:\n" ++
179 " :abandon at a breakpoint, abandon current computation\n" ++
180 " :back go back in the history (after :trace)\n" ++
181 " :break [<mod>] <l> [<col>] set a breakpoint at the specified location\n" ++
182 " :break <name> set a breakpoint on the specified function\n" ++
183 " :continue resume after a breakpoint\n" ++
184 " :delete <number> delete the specified breakpoint\n" ++
185 " :delete * delete all breakpoints\n" ++
186 " :force <expr> print <expr>, forcing unevaluated parts\n" ++
187 " :forward go forward in the history (after :back)\n" ++
188 " :history [<n>] show the last <n> items in the history (after :trace)\n" ++
189 " :print [<name> ...] prints a value without forcing its computation\n" ++
190 " :sprint [<name> ...] simplifed version of :print\n" ++
191 " :step single-step after stopping at a breakpoint\n"++
192 " :step <expr> single-step into <expr>\n"++
193 " :trace trace after stopping at a breakpoint\n"++
194 " :trace <expr> trace into <expr> (remembers breakpoints for :history)\n"++
197 " -- Commands for changing settings:\n" ++
199 " :set <option> ... set options\n" ++
200 " :set args <arg> ... set the arguments returned by System.getArgs\n" ++
201 " :set prog <progname> set the value returned by System.getProgName\n" ++
202 " :set prompt <prompt> set the prompt used in GHCi\n" ++
203 " :set editor <cmd> set the command used for :edit\n" ++
204 " :set stop <cmd> set the command to run when a breakpoint is hit\n" ++
205 " :unset <option> ... unset options\n" ++
207 " Options for ':set' and ':unset':\n" ++
209 " +r revert top-level expressions after each evaluation\n" ++
210 " +s print timing/memory stats after each evaluation\n" ++
211 " +t print type after evaluation\n" ++
212 " -<flags> most GHC command line flags can also be set here\n" ++
213 " (eg. -v2, -fglasgow-exts, etc.)\n" ++
215 " -- Commands for displaying information:\n" ++
217 " :show bindings show the current bindings made at the prompt\n" ++
218 " :show breaks show the active breakpoints\n" ++
219 " :show context show the breakpoint context\n" ++
220 " :show modules show the currently loaded modules\n" ++
221 " :show <setting> show anything that can be set with :set (e.g. args)\n" ++
228 win <- System.Win32.getWindowsDirectory
229 return (win `joinFileName` "notepad.exe")
234 interactiveUI :: Session -> [(FilePath, Maybe Phase)] -> Maybe String -> IO ()
235 interactiveUI session srcs maybe_expr = do
236 -- HACK! If we happen to get into an infinite loop (eg the user
237 -- types 'let x=x in x' at the prompt), then the thread will block
238 -- on a blackhole, and become unreachable during GC. The GC will
239 -- detect that it is unreachable and send it the NonTermination
240 -- exception. However, since the thread is unreachable, everything
241 -- it refers to might be finalized, including the standard Handles.
242 -- This sounds like a bug, but we don't have a good solution right
248 -- Initialise buffering for the *interpreted* I/O system
249 initInterpBuffering session
251 when (isNothing maybe_expr) $ do
252 -- Only for GHCi (not runghc and ghc -e):
253 -- Turn buffering off for the compiled program's stdout/stderr
255 -- Turn buffering off for GHCi's stdout
257 hSetBuffering stdout NoBuffering
258 -- We don't want the cmd line to buffer any input that might be
259 -- intended for the program, so unbuffer stdin.
260 hSetBuffering stdin NoBuffering
262 -- initial context is just the Prelude
263 prel_mod <- GHC.findModule session prel_name (Just basePackageId)
264 GHC.setContext session [] [prel_mod]
268 Readline.setAttemptedCompletionFunction (Just completeWord)
269 --Readline.parseAndBind "set show-all-if-ambiguous 1"
271 let symbols = "!#$%&*+/<=>?@\\^|-~"
272 specials = "(),;[]`{}"
274 word_break_chars = spaces ++ specials ++ symbols
276 Readline.setBasicWordBreakCharacters word_break_chars
277 Readline.setCompleterWordBreakCharacters word_break_chars
280 default_editor <- findEditor
282 startGHCi (runGHCi srcs maybe_expr)
283 GHCiState{ progname = "<interactive>",
287 editor = default_editor,
293 tickarrays = emptyModuleEnv,
298 Readline.resetTerminal Nothing
303 prel_name = GHC.mkModuleName "Prelude"
305 runGHCi :: [(FilePath, Maybe Phase)] -> Maybe String -> GHCi ()
306 runGHCi paths maybe_expr = do
307 let read_dot_files = not opt_IgnoreDotGhci
309 when (read_dot_files) $ do
312 exists <- io (doesFileExist file)
314 dir_ok <- io (checkPerms ".")
315 file_ok <- io (checkPerms file)
316 when (dir_ok && file_ok) $ do
317 either_hdl <- io (IO.try (openFile "./.ghci" ReadMode))
320 Right hdl -> fileLoop hdl False
322 when (read_dot_files) $ do
323 -- Read in $HOME/.ghci
324 either_dir <- io (IO.try (getEnv "HOME"))
328 cwd <- io (getCurrentDirectory)
329 when (dir /= cwd) $ do
330 let file = dir ++ "/.ghci"
331 ok <- io (checkPerms file)
333 either_hdl <- io (IO.try (openFile file ReadMode))
336 Right hdl -> fileLoop hdl False
338 -- Perform a :load for files given on the GHCi command line
339 -- When in -e mode, if the load fails then we want to stop
340 -- immediately rather than going on to evaluate the expression.
341 when (not (null paths)) $ do
342 ok <- ghciHandle (\e -> do showException e; return Failed) $
344 when (isJust maybe_expr && failed ok) $
345 io (exitWith (ExitFailure 1))
347 -- if verbosity is greater than 0, or we are connected to a
348 -- terminal, display the prompt in the interactive loop.
349 is_tty <- io (hIsTerminalDevice stdin)
350 dflags <- getDynFlags
351 let show_prompt = verbosity dflags > 0 || is_tty
356 #if defined(mingw32_HOST_OS)
357 -- The win32 Console API mutates the first character of
358 -- type-ahead when reading from it in a non-buffered manner. Work
359 -- around this by flushing the input buffer of type-ahead characters,
360 -- but only if stdin is available.
361 flushed <- io (IO.try (GHC.ConsoleHandler.flushConsole stdin))
363 Left err | isDoesNotExistError err -> return ()
364 | otherwise -> io (ioError err)
365 Right () -> return ()
367 -- initialise the console if necessary
370 -- enter the interactive loop
371 interactiveLoop is_tty show_prompt
373 -- just evaluate the expression we were given
378 io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
381 interactiveLoop is_tty show_prompt =
382 -- Ignore ^C exceptions caught here
383 ghciHandleDyn (\e -> case e of
385 #if defined(mingw32_HOST_OS)
388 interactiveLoop is_tty show_prompt
389 _other -> return ()) $
391 ghciUnblock $ do -- unblock necessary if we recursed from the
392 -- exception handler above.
394 -- read commands from stdin
398 else fileLoop stdin show_prompt
400 fileLoop stdin show_prompt
404 -- NOTE: We only read .ghci files if they are owned by the current user,
405 -- and aren't world writable. Otherwise, we could be accidentally
406 -- running code planted by a malicious third party.
408 -- Furthermore, We only read ./.ghci if . is owned by the current user
409 -- and isn't writable by anyone else. I think this is sufficient: we
410 -- don't need to check .. and ../.. etc. because "." always refers to
411 -- the same directory while a process is running.
413 checkPerms :: String -> IO Bool
415 #ifdef mingw32_HOST_OS
418 Util.handle (\_ -> return False) $ do
419 st <- getFileStatus name
421 if fileOwner st /= me then do
422 putStrLn $ "WARNING: " ++ name ++ " is owned by someone else, IGNORING!"
425 let mode = fileMode st
426 if (groupWriteMode == (mode `intersectFileModes` groupWriteMode))
427 || (otherWriteMode == (mode `intersectFileModes` otherWriteMode))
429 putStrLn $ "*** WARNING: " ++ name ++
430 " is writable by someone else, IGNORING!"
435 fileLoop :: Handle -> Bool -> GHCi ()
436 fileLoop hdl show_prompt = do
437 when show_prompt $ do
440 l <- io (IO.try (hGetLine hdl))
442 Left e | isEOFError e -> return ()
443 | InvalidArgument <- etype -> return ()
444 | otherwise -> io (ioError e)
445 where etype = ioeGetErrorType e
446 -- treat InvalidArgument in the same way as EOF:
447 -- this can happen if the user closed stdin, or
448 -- perhaps did getContents which closes stdin at
451 case removeSpaces l of
452 "" -> fileLoop hdl show_prompt
453 l -> do quit <- runCommands l
454 if quit then return () else fileLoop hdl show_prompt
457 session <- getSession
458 (toplevs,exports) <- io (GHC.getContext session)
459 resumes <- io $ GHC.getResumeContext session
465 let ix = GHC.resumeHistoryIx r
467 then return (brackets (ppr (GHC.resumeSpan r)) <> space)
469 let hist = GHC.resumeHistory r !! (ix-1)
470 span <- io $ GHC.getHistorySpan session hist
471 return (brackets (ppr (negate ix) <> char ':'
472 <+> ppr span) <> space)
474 dots | r:rs <- resumes, not (null rs) = text "... "
478 hsep (map (\m -> char '*' <> ppr (GHC.moduleName m)) toplevs) <+>
479 hsep (map (ppr . GHC.moduleName) exports)
481 deflt_prompt = dots <> context_bit <> modules_bit
483 f ('%':'s':xs) = deflt_prompt <> f xs
484 f ('%':'%':xs) = char '%' <> f xs
485 f (x:xs) = char x <> f xs
489 return (showSDoc (f (prompt st)))
493 readlineLoop :: GHCi ()
495 session <- getSession
496 (mod,imports) <- io (GHC.getContext session)
498 saveSession -- for use by completion
500 mb_span <- getCurrentBreakSpan
502 l <- io (readline prompt `finally` setNonBlockingFD 0)
503 -- readline sometimes puts stdin into blocking mode,
504 -- so we need to put it back for the IO library
509 case removeSpaces l of
513 quit <- runCommands l
514 if quit then return () else readlineLoop
517 runCommands :: String -> GHCi Bool
519 q <- ghciHandle handler (doCommand cmd)
520 if q then return True else runNext
526 c:cs -> do setGHCiState st{ cmdqueue = cs }
529 doCommand (':' : cmd) = specialCommand cmd
530 doCommand stmt = do timeIt $ runStmt stmt GHC.RunToCompletion
533 enqueueCommands :: [String] -> GHCi ()
534 enqueueCommands cmds = do
536 setGHCiState st{ cmdqueue = cmds ++ cmdqueue st }
539 -- This version is for the GHC command-line option -e. The only difference
540 -- from runCommand is that it catches the ExitException exception and
541 -- exits, rather than printing out the exception.
542 runCommandEval c = ghciHandle handleEval (doCommand c)
544 handleEval (ExitException code) = io (exitWith code)
545 handleEval e = do handler e
546 io (exitWith (ExitFailure 1))
548 doCommand (':' : command) = specialCommand command
550 = do r <- runStmt stmt GHC.RunToCompletion
552 False -> io (exitWith (ExitFailure 1))
553 -- failure to run the command causes exit(1) for ghc -e.
556 runStmt :: String -> SingleStep -> GHCi Bool
558 | null (filter (not.isSpace) stmt) = return False
559 | ["import", mod] <- words stmt = keepGoing setContext ('+':mod)
561 = do st <- getGHCiState
562 session <- getSession
563 result <- io $ withProgName (progname st) $ withArgs (args st) $
564 GHC.runStmt session stmt step
568 afterRunStmt :: GHC.RunResult -> GHCi Bool
569 -- False <=> the statement failed to compile
570 afterRunStmt (GHC.RunException e) = throw e
571 afterRunStmt run_result = do
572 session <- getSession
574 GHC.RunOk names -> do
575 show_types <- isOptionSet ShowType
576 when show_types $ mapM_ (showTypeOfName session) names
577 GHC.RunBreak _ names mb_info -> do
578 resumes <- io $ GHC.getResumeContext session
579 printForUser $ ptext SLIT("Stopped at") <+>
580 ppr (GHC.resumeSpan (head resumes))
581 mapM_ (showTypeOfName session) names
582 maybe (return ()) runBreakCmd mb_info
583 -- run the command set with ":set stop <cmd>"
585 enqueueCommands [stop st]
590 io installSignalHandlers
591 b <- isOptionSet RevertCAFs
592 io (when b revertCAFs)
594 return (case run_result of GHC.RunOk _ -> True; _ -> False)
596 runBreakCmd :: GHC.BreakInfo -> GHCi ()
597 runBreakCmd info = do
598 let mod = GHC.breakInfo_module info
599 nm = GHC.breakInfo_number info
601 case [ loc | (i,loc) <- breaks st,
602 breakModule loc == mod, breakTick loc == nm ] of
604 loc:_ | null cmd -> return ()
605 | otherwise -> do enqueueCommands [cmd]; return ()
606 where cmd = onBreakCmd loc
608 showTypeOfName :: Session -> Name -> GHCi ()
609 showTypeOfName session n
610 = do maybe_tything <- io (GHC.lookupName session n)
611 case maybe_tything of
613 Just thing -> showTyThing thing
615 specialCommand :: String -> GHCi Bool
616 specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
617 specialCommand str = do
618 let (cmd,rest) = break isSpace str
619 maybe_cmd <- io (lookupCommand cmd)
621 Nothing -> io (hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n"
622 ++ shortHelpText) >> return False)
623 Just (_,f,_,_) -> f (dropWhile isSpace rest)
625 lookupCommand :: String -> IO (Maybe Command)
626 lookupCommand str = do
627 cmds <- readIORef commands
628 -- look for exact match first, then the first prefix match
629 case [ c | c <- cmds, str == cmdName c ] of
630 c:_ -> return (Just c)
631 [] -> case [ c | c@(s,_,_,_) <- cmds, prefixMatch str s ] of
633 c:_ -> return (Just c)
636 getCurrentBreakSpan :: GHCi (Maybe SrcSpan)
637 getCurrentBreakSpan = do
638 session <- getSession
639 resumes <- io $ GHC.getResumeContext session
643 let ix = GHC.resumeHistoryIx r
645 then return (Just (GHC.resumeSpan r))
647 let hist = GHC.resumeHistory r !! (ix-1)
648 span <- io $ GHC.getHistorySpan session hist
651 -----------------------------------------------------------------------------
654 noArgs :: GHCi () -> String -> GHCi ()
656 noArgs m _ = io $ putStrLn "This command takes no arguments"
658 help :: String -> GHCi ()
659 help _ = io (putStr helpText)
661 info :: String -> GHCi ()
662 info "" = throwDyn (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
663 info s = do { let names = words s
664 ; session <- getSession
665 ; dflags <- getDynFlags
666 ; let exts = dopt Opt_GlasgowExts dflags
667 ; mapM_ (infoThing exts session) names }
669 infoThing exts session str = io $ do
670 names <- GHC.parseName session str
671 let filtered = filterOutChildren names
672 mb_stuffs <- mapM (GHC.getInfo session) filtered
673 unqual <- GHC.getPrintUnqual session
674 putStrLn (showSDocForUser unqual $
675 vcat (intersperse (text "") $
676 [ pprInfo exts stuff | Just stuff <- mb_stuffs ]))
678 -- Filter out names whose parent is also there Good
679 -- example is '[]', which is both a type and data
680 -- constructor in the same type
681 filterOutChildren :: [Name] -> [Name]
682 filterOutChildren names = filter (not . parent_is_there) names
683 where parent_is_there n
684 -- | Just p <- GHC.nameParent_maybe n = p `elem` names
688 pprInfo exts (thing, fixity, insts)
689 = pprTyThingInContextLoc exts thing
690 $$ show_fixity fixity
691 $$ vcat (map GHC.pprInstance insts)
694 | fix == GHC.defaultFixity = empty
695 | otherwise = ppr fix <+> ppr (GHC.getName thing)
697 runMain :: String -> GHCi ()
699 let ss = concat $ intersperse "," (map (\ s -> ('"':s)++"\"") (toArgs args))
700 enqueueCommands ['[': ss ++ "] `System.Environment.withArgs` main"]
702 addModule :: [FilePath] -> GHCi ()
704 io (revertCAFs) -- always revert CAFs on load/add.
705 files <- mapM expandPath files
706 targets <- mapM (\m -> io (GHC.guessTarget m Nothing)) files
707 session <- getSession
708 io (mapM_ (GHC.addTarget session) targets)
709 ok <- io (GHC.load session LoadAllTargets)
712 changeDirectory :: String -> GHCi ()
713 changeDirectory dir = do
714 session <- getSession
715 graph <- io (GHC.getModuleGraph session)
716 when (not (null graph)) $
717 io $ putStr "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed.\n"
718 io (GHC.setTargets session [])
719 io (GHC.load session LoadAllTargets)
720 setContextAfterLoad session []
721 io (GHC.workingDirectoryChanged session)
722 dir <- expandPath dir
723 io (setCurrentDirectory dir)
725 editFile :: String -> GHCi ()
727 do file <- if null str then chooseEditFile else return str
731 $ throwDyn (CmdLineError "editor not set, use :set editor")
732 io $ system (cmd ++ ' ':file)
735 -- The user didn't specify a file so we pick one for them.
736 -- Our strategy is to pick the first module that failed to load,
737 -- or otherwise the first target.
739 -- XXX: Can we figure out what happened if the depndecy analysis fails
740 -- (e.g., because the porgrammeer mistyped the name of a module)?
741 -- XXX: Can we figure out the location of an error to pass to the editor?
742 -- XXX: if we could figure out the list of errors that occured during the
743 -- last load/reaload, then we could start the editor focused on the first
745 chooseEditFile :: GHCi String
747 do session <- getSession
748 let hasFailed x = io $ fmap not $ GHC.isLoaded session $ GHC.ms_mod_name x
750 graph <- io (GHC.getModuleGraph session)
751 failed_graph <- filterM hasFailed graph
752 let order g = flattenSCCs $ GHC.topSortModuleGraph True g Nothing
754 x : _ -> GHC.ml_hs_file (GHC.ms_location x)
757 case pick (order failed_graph) of
758 Just file -> return file
760 do targets <- io (GHC.getTargets session)
761 case msum (map fromTarget targets) of
762 Just file -> return file
763 Nothing -> throwDyn (CmdLineError "No files to edit.")
765 where fromTarget (GHC.Target (GHC.TargetFile f _) _) = Just f
766 fromTarget _ = Nothing -- when would we get a module target?
768 defineMacro :: String -> GHCi ()
770 let (macro_name, definition) = break isSpace s
771 cmds <- io (readIORef commands)
773 then throwDyn (CmdLineError "invalid macro name")
775 if (macro_name `elem` map cmdName cmds)
776 then throwDyn (CmdLineError
777 ("command '" ++ macro_name ++ "' is already defined"))
780 -- give the expression a type signature, so we can be sure we're getting
781 -- something of the right type.
782 let new_expr = '(' : definition ++ ") :: String -> IO String"
784 -- compile the expression
786 maybe_hv <- io (GHC.compileExpr cms new_expr)
789 Just hv -> io (writeIORef commands --
790 (cmds ++ [(macro_name, runMacro hv, False, completeNone)]))
792 runMacro :: GHC.HValue{-String -> IO String-} -> String -> GHCi Bool
794 str <- io ((unsafeCoerce# fun :: String -> IO String) s)
795 enqueueCommands (lines str)
798 undefineMacro :: String -> GHCi ()
799 undefineMacro macro_name = do
800 cmds <- io (readIORef commands)
801 if (macro_name `elem` map cmdName builtin_commands)
802 then throwDyn (CmdLineError
803 ("command '" ++ macro_name ++ "' cannot be undefined"))
805 if (macro_name `notElem` map cmdName cmds)
806 then throwDyn (CmdLineError
807 ("command '" ++ macro_name ++ "' not defined"))
809 io (writeIORef commands (filter ((/= macro_name) . cmdName) cmds))
811 cmdCmd :: String -> GHCi ()
813 let expr = '(' : str ++ ") :: IO String"
814 session <- getSession
815 maybe_hv <- io (GHC.compileExpr session expr)
819 cmds <- io $ (unsafeCoerce# hv :: IO String)
820 enqueueCommands (lines cmds)
823 loadModule :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
824 loadModule fs = timeIt (loadModule' fs)
826 loadModule_ :: [FilePath] -> GHCi ()
827 loadModule_ fs = do loadModule (zip fs (repeat Nothing)); return ()
829 loadModule' :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
830 loadModule' files = do
831 session <- getSession
834 discardActiveBreakPoints
835 io (GHC.setTargets session [])
836 io (GHC.load session LoadAllTargets)
839 let (filenames, phases) = unzip files
840 exp_filenames <- mapM expandPath filenames
841 let files' = zip exp_filenames phases
842 targets <- io (mapM (uncurry GHC.guessTarget) files')
844 -- NOTE: we used to do the dependency anal first, so that if it
845 -- fails we didn't throw away the current set of modules. This would
846 -- require some re-working of the GHC interface, so we'll leave it
847 -- as a ToDo for now.
849 io (GHC.setTargets session targets)
850 doLoad session LoadAllTargets
852 checkModule :: String -> GHCi ()
854 let modl = GHC.mkModuleName m
855 session <- getSession
856 result <- io (GHC.checkModule session modl)
858 Nothing -> io $ putStrLn "Nothing"
859 Just r -> io $ putStrLn (showSDoc (
860 case GHC.checkedModuleInfo r of
861 Just cm | Just scope <- GHC.modInfoTopLevelScope cm ->
863 (local,global) = partition ((== modl) . GHC.moduleName . GHC.nameModule) scope
865 (text "global names: " <+> ppr global) $$
866 (text "local names: " <+> ppr local)
868 afterLoad (successIf (isJust result)) session
870 reloadModule :: String -> GHCi ()
872 io (revertCAFs) -- always revert CAFs on reload.
873 discardActiveBreakPoints
874 session <- getSession
875 doLoad session LoadAllTargets
878 io (revertCAFs) -- always revert CAFs on reload.
879 discardActiveBreakPoints
880 session <- getSession
881 doLoad session (LoadUpTo (GHC.mkModuleName m))
884 doLoad session howmuch = do
885 -- turn off breakpoints before we load: we can't turn them off later, because
886 -- the ModBreaks will have gone away.
887 discardActiveBreakPoints
888 ok <- io (GHC.load session howmuch)
892 afterLoad ok session = do
893 io (revertCAFs) -- always revert CAFs on load.
895 graph <- io (GHC.getModuleGraph session)
896 graph' <- filterM (io . GHC.isLoaded session . GHC.ms_mod_name) graph
897 setContextAfterLoad session graph'
898 modulesLoadedMsg ok (map GHC.ms_mod_name graph')
900 setContextAfterLoad session [] = do
901 prel_mod <- getPrelude
902 io (GHC.setContext session [] [prel_mod])
903 setContextAfterLoad session ms = do
904 -- load a target if one is available, otherwise load the topmost module.
905 targets <- io (GHC.getTargets session)
906 case [ m | Just m <- map (findTarget ms) targets ] of
908 let graph' = flattenSCCs (GHC.topSortModuleGraph True ms Nothing) in
909 load_this (last graph')
914 = case filter (`matches` t) ms of
918 summary `matches` Target (TargetModule m) _
919 = GHC.ms_mod_name summary == m
920 summary `matches` Target (TargetFile f _) _
921 | Just f' <- GHC.ml_hs_file (GHC.ms_location summary) = f == f'
922 summary `matches` target
925 load_this summary | m <- GHC.ms_mod summary = do
926 b <- io (GHC.moduleIsInterpreted session m)
927 if b then io (GHC.setContext session [m] [])
929 prel_mod <- getPrelude
930 io (GHC.setContext session [] [prel_mod,m])
933 modulesLoadedMsg :: SuccessFlag -> [ModuleName] -> GHCi ()
934 modulesLoadedMsg ok mods = do
935 dflags <- getDynFlags
936 when (verbosity dflags > 0) $ do
938 | null mods = text "none."
940 punctuate comma (map ppr mods)) <> text "."
943 io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
945 io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
948 typeOfExpr :: String -> GHCi ()
950 = do cms <- getSession
951 maybe_ty <- io (GHC.exprType cms str)
954 Just ty -> do ty' <- cleanType ty
955 printForUser $ text str <> text " :: " <> ppr ty'
957 kindOfType :: String -> GHCi ()
959 = do cms <- getSession
960 maybe_ty <- io (GHC.typeKind cms str)
963 Just ty -> printForUser $ text str <> text " :: " <> ppr ty
965 quit :: String -> GHCi Bool
968 shellEscape :: String -> GHCi Bool
969 shellEscape str = io (system str >> return False)
971 -----------------------------------------------------------------------------
972 -- Browsing a module's contents
974 browseCmd :: String -> GHCi ()
977 ['*':m] | looksLikeModuleName m -> browseModule m False
978 [m] | looksLikeModuleName m -> browseModule m True
979 _ -> throwDyn (CmdLineError "syntax: :browse <module>")
981 browseModule m exports_only = do
983 modl <- if exports_only then lookupModule m
984 else wantInterpretedModule m
986 -- Temporarily set the context to the module we're interested in,
987 -- just so we can get an appropriate PrintUnqualified
988 (as,bs) <- io (GHC.getContext s)
989 prel_mod <- getPrelude
990 io (if exports_only then GHC.setContext s [] [prel_mod,modl]
991 else GHC.setContext s [modl] [])
992 unqual <- io (GHC.getPrintUnqual s)
993 io (GHC.setContext s as bs)
995 mb_mod_info <- io $ GHC.getModuleInfo s modl
997 Nothing -> throwDyn (CmdLineError ("unknown module: " ++ m))
1000 | exports_only = GHC.modInfoExports mod_info
1001 | otherwise = fromMaybe [] (GHC.modInfoTopLevelScope mod_info)
1003 filtered = filterOutChildren names
1005 things <- io $ mapM (GHC.lookupName s) filtered
1007 dflags <- getDynFlags
1008 let exts = dopt Opt_GlasgowExts dflags
1009 io (putStrLn (showSDocForUser unqual (
1010 vcat (map (pprTyThingInContext exts) (catMaybes things))
1012 -- ToDo: modInfoInstances currently throws an exception for
1013 -- package modules. When it works, we can do this:
1014 -- $$ vcat (map GHC.pprInstance (GHC.modInfoInstances mod_info))
1016 -----------------------------------------------------------------------------
1017 -- Setting the module context
1020 | all sensible mods = fn mods
1021 | otherwise = throwDyn (CmdLineError "syntax: :module [+/-] [*]M1 ... [*]Mn")
1023 (fn, mods) = case str of
1024 '+':stuff -> (addToContext, words stuff)
1025 '-':stuff -> (removeFromContext, words stuff)
1026 stuff -> (newContext, words stuff)
1028 sensible ('*':m) = looksLikeModuleName m
1029 sensible m = looksLikeModuleName m
1031 separate :: Session -> [String] -> [Module] -> [Module]
1032 -> GHCi ([Module],[Module])
1033 separate session [] as bs = return (as,bs)
1034 separate session (('*':str):ms) as bs = do
1035 m <- io $ GHC.findModule session (GHC.mkModuleName str) Nothing
1036 b <- io $ GHC.moduleIsInterpreted session m
1037 if b then separate session ms (m:as) bs
1038 else throwDyn (CmdLineError ("module '"
1039 ++ GHC.moduleNameString (GHC.moduleName m)
1040 ++ "' is not interpreted"))
1041 separate session (str:ms) as bs = do
1042 m <- io $ GHC.findModule session (GHC.mkModuleName str) Nothing
1043 separate session ms as (m:bs)
1045 newContext :: [String] -> GHCi ()
1046 newContext strs = do
1048 (as,bs) <- separate s strs [] []
1049 prel_mod <- getPrelude
1050 let bs' = if null as && prel_mod `notElem` bs then prel_mod:bs else bs
1051 io $ GHC.setContext s as bs'
1054 addToContext :: [String] -> GHCi ()
1055 addToContext strs = do
1057 (as,bs) <- io $ GHC.getContext s
1059 (new_as,new_bs) <- separate s strs [] []
1061 let as_to_add = new_as \\ (as ++ bs)
1062 bs_to_add = new_bs \\ (as ++ bs)
1064 io $ GHC.setContext s (as ++ as_to_add) (bs ++ bs_to_add)
1067 removeFromContext :: [String] -> GHCi ()
1068 removeFromContext strs = do
1070 (as,bs) <- io $ GHC.getContext s
1072 (as_to_remove,bs_to_remove) <- separate s strs [] []
1074 let as' = as \\ (as_to_remove ++ bs_to_remove)
1075 bs' = bs \\ (as_to_remove ++ bs_to_remove)
1077 io $ GHC.setContext s as' bs'
1079 ----------------------------------------------------------------------------
1082 -- set options in the interpreter. Syntax is exactly the same as the
1083 -- ghc command line, except that certain options aren't available (-C,
1086 -- This is pretty fragile: most options won't work as expected. ToDo:
1087 -- figure out which ones & disallow them.
1089 setCmd :: String -> GHCi ()
1091 = do st <- getGHCiState
1092 let opts = options st
1093 io $ putStrLn (showSDoc (
1094 text "options currently set: " <>
1097 else hsep (map (\o -> char '+' <> text (optToStr o)) opts)
1100 = case toArgs str of
1101 ("args":args) -> setArgs args
1102 ("prog":prog) -> setProg prog
1103 ("prompt":prompt) -> setPrompt (after 6)
1104 ("editor":cmd) -> setEditor (after 6)
1105 ("stop":cmd) -> setStop (after 4)
1106 wds -> setOptions wds
1107 where after n = dropWhile isSpace $ drop n $ dropWhile isSpace str
1111 setGHCiState st{ args = args }
1115 setGHCiState st{ progname = prog }
1117 io (hPutStrLn stderr "syntax: :set prog <progname>")
1121 setGHCiState st{ editor = cmd }
1123 setStop str@(c:_) | isDigit c
1124 = do let (nm_str,rest) = break (not.isDigit) str
1127 let old_breaks = breaks st
1128 if all ((/= nm) . fst) old_breaks
1129 then printForUser (text "Breakpoint" <+> ppr nm <+>
1130 text "does not exist")
1132 let new_breaks = map fn old_breaks
1133 fn (i,loc) | i == nm = (i,loc { onBreakCmd = dropWhile isSpace rest })
1134 | otherwise = (i,loc)
1135 setGHCiState st{ breaks = new_breaks }
1138 setGHCiState st{ stop = cmd }
1140 setPrompt value = do
1143 then io $ hPutStrLn stderr $ "syntax: :set prompt <prompt>, currently \"" ++ prompt st ++ "\""
1144 else setGHCiState st{ prompt = remQuotes value }
1146 remQuotes ('\"':xs) | not (null xs) && last xs == '\"' = init xs
1150 do -- first, deal with the GHCi opts (+s, +t, etc.)
1151 let (plus_opts, minus_opts) = partition isPlus wds
1152 mapM_ setOpt plus_opts
1153 -- then, dynamic flags
1154 newDynFlags minus_opts
1156 newDynFlags minus_opts = do
1157 dflags <- getDynFlags
1158 let pkg_flags = packageFlags dflags
1159 (dflags',leftovers) <- io $ GHC.parseDynamicFlags dflags minus_opts
1161 if (not (null leftovers))
1162 then throwDyn (CmdLineError ("unrecognised flags: " ++
1166 new_pkgs <- setDynFlags dflags'
1168 -- if the package flags changed, we should reset the context
1169 -- and link the new packages.
1170 dflags <- getDynFlags
1171 when (packageFlags dflags /= pkg_flags) $ do
1172 io $ hPutStrLn stderr "package flags have changed, ressetting and loading new packages..."
1173 session <- getSession
1174 io (GHC.setTargets session [])
1175 io (GHC.load session LoadAllTargets)
1176 io (linkPackages dflags new_pkgs)
1177 setContextAfterLoad session []
1181 unsetOptions :: String -> GHCi ()
1183 = do -- first, deal with the GHCi opts (+s, +t, etc.)
1184 let opts = words str
1185 (minus_opts, rest1) = partition isMinus opts
1186 (plus_opts, rest2) = partition isPlus rest1
1188 if (not (null rest2))
1189 then io (putStrLn ("unknown option: '" ++ head rest2 ++ "'"))
1192 mapM_ unsetOpt plus_opts
1194 let no_flag ('-':'f':rest) = return ("-fno-" ++ rest)
1195 no_flag f = throwDyn (ProgramError ("don't know how to reverse " ++ f))
1197 no_flags <- mapM no_flag minus_opts
1198 newDynFlags no_flags
1200 isMinus ('-':s) = True
1203 isPlus ('+':s) = True
1207 = case strToGHCiOpt str of
1208 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1209 Just o -> setOption o
1212 = case strToGHCiOpt str of
1213 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1214 Just o -> unsetOption o
1216 strToGHCiOpt :: String -> (Maybe GHCiOption)
1217 strToGHCiOpt "s" = Just ShowTiming
1218 strToGHCiOpt "t" = Just ShowType
1219 strToGHCiOpt "r" = Just RevertCAFs
1220 strToGHCiOpt _ = Nothing
1222 optToStr :: GHCiOption -> String
1223 optToStr ShowTiming = "s"
1224 optToStr ShowType = "t"
1225 optToStr RevertCAFs = "r"
1227 -- ---------------------------------------------------------------------------
1233 ["args"] -> io $ putStrLn (show (args st))
1234 ["prog"] -> io $ putStrLn (show (progname st))
1235 ["prompt"] -> io $ putStrLn (show (prompt st))
1236 ["editor"] -> io $ putStrLn (show (editor st))
1237 ["stop"] -> io $ putStrLn (show (stop st))
1238 ["modules" ] -> showModules
1239 ["bindings"] -> showBindings
1240 ["linker"] -> io showLinkerState
1241 ["breaks"] -> showBkptTable
1242 ["context"] -> showContext
1243 _ -> throwDyn (CmdLineError "syntax: :show [args|prog|prompt|editor|stop|modules|bindings|breaks|context]")
1246 session <- getSession
1247 let show_one ms = do m <- io (GHC.showModule session ms)
1249 graph <- io (GHC.getModuleGraph session)
1250 mapM_ show_one graph
1254 unqual <- io (GHC.getPrintUnqual s)
1255 bindings <- io (GHC.getBindings s)
1256 mapM_ showTyThing bindings
1259 showTyThing (AnId id) = do
1260 ty' <- cleanType (GHC.idType id)
1261 printForUser $ ppr id <> text " :: " <> ppr ty'
1262 showTyThing _ = return ()
1264 -- if -fglasgow-exts is on we show the foralls, otherwise we don't.
1265 cleanType :: Type -> GHCi Type
1267 dflags <- getDynFlags
1268 if dopt Opt_GlasgowExts dflags
1270 else return $! GHC.dropForAlls ty
1272 showBkptTable :: GHCi ()
1275 printForUser $ prettyLocations (breaks st)
1277 showContext :: GHCi ()
1279 session <- getSession
1280 resumes <- io $ GHC.getResumeContext session
1281 printForUser $ vcat (map pp_resume (reverse resumes))
1284 ptext SLIT("--> ") <> text (GHC.resumeStmt resume)
1285 $$ nest 2 (ptext SLIT("Stopped at") <+> ppr (GHC.resumeSpan resume))
1288 -- -----------------------------------------------------------------------------
1291 completeNone :: String -> IO [String]
1292 completeNone w = return []
1295 completeWord :: String -> Int -> Int -> IO (Maybe (String, [String]))
1296 completeWord w start end = do
1297 line <- Readline.getLineBuffer
1299 ':':_ | all isSpace (take (start-1) line) -> wrapCompleter completeCmd w
1301 | Just c <- is_cmd line -> do
1302 maybe_cmd <- lookupCommand c
1303 let (n,w') = selectWord (words' 0 line)
1305 Nothing -> return Nothing
1306 Just (_,_,False,complete) -> wrapCompleter complete w
1307 Just (_,_,True,complete) -> let complete' w = do rets <- complete w
1308 return (map (drop n) rets)
1309 in wrapCompleter complete' w'
1311 --printf "complete %s, start = %d, end = %d\n" w start end
1312 wrapCompleter completeIdentifier w
1313 where words' _ [] = []
1314 words' n str = let (w,r) = break isSpace str
1315 (s,r') = span isSpace r
1316 in (n,w):words' (n+length w+length s) r'
1317 -- In a Haskell expression we want to parse 'a-b' as three words
1318 -- where a compiler flag (ie. -fno-monomorphism-restriction) should
1319 -- only be a single word.
1320 selectWord [] = (0,w)
1321 selectWord ((offset,x):xs)
1322 | offset+length x >= start = (start-offset,take (end-offset) x)
1323 | otherwise = selectWord xs
1326 | ((':':w) : _) <- words (dropWhile isSpace line) = Just w
1327 | otherwise = Nothing
1330 cmds <- readIORef commands
1331 return (filter (w `isPrefixOf`) (map (':':) (map cmdName cmds)))
1333 completeMacro w = do
1334 cmds <- readIORef commands
1335 let cmds' = [ cmd | cmd <- map cmdName cmds, cmd `elem` map cmdName builtin_commands ]
1336 return (filter (w `isPrefixOf`) cmds')
1338 completeIdentifier w = do
1340 rdrs <- GHC.getRdrNamesInScope s
1341 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) rdrs))
1343 completeModule w = do
1345 dflags <- GHC.getSessionDynFlags s
1346 let pkg_mods = allExposedModules dflags
1347 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) pkg_mods))
1349 completeHomeModule w = do
1351 g <- GHC.getModuleGraph s
1352 let home_mods = map GHC.ms_mod_name g
1353 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) home_mods))
1355 completeSetOptions w = do
1356 return (filter (w `isPrefixOf`) options)
1357 where options = "args":"prog":allFlags
1359 completeFilename = Readline.filenameCompletionFunction
1361 completeHomeModuleOrFile = unionComplete completeHomeModule completeFilename
1363 unionComplete :: (String -> IO [String]) -> (String -> IO [String]) -> String -> IO [String]
1364 unionComplete f1 f2 w = do
1369 wrapCompleter :: (String -> IO [String]) -> String -> IO (Maybe (String,[String]))
1370 wrapCompleter fun w = do
1373 [] -> return Nothing
1374 [x] -> return (Just (x,[]))
1375 xs -> case getCommonPrefix xs of
1376 "" -> return (Just ("",xs))
1377 pref -> return (Just (pref,xs))
1379 getCommonPrefix :: [String] -> String
1380 getCommonPrefix [] = ""
1381 getCommonPrefix (s:ss) = foldl common s ss
1382 where common s "" = ""
1384 common (c:cs) (d:ds)
1385 | c == d = c : common cs ds
1388 allExposedModules :: DynFlags -> [ModuleName]
1389 allExposedModules dflags
1390 = map GHC.mkModuleName (concat (map exposedModules (filter exposed (eltsUFM pkg_db))))
1392 pkg_db = pkgIdMap (pkgState dflags)
1394 completeCmd = completeNone
1395 completeMacro = completeNone
1396 completeIdentifier = completeNone
1397 completeModule = completeNone
1398 completeHomeModule = completeNone
1399 completeSetOptions = completeNone
1400 completeFilename = completeNone
1401 completeHomeModuleOrFile=completeNone
1402 completeBkpt = completeNone
1405 -- ---------------------------------------------------------------------------
1406 -- User code exception handling
1408 -- This is the exception handler for exceptions generated by the
1409 -- user's code and exceptions coming from children sessions;
1410 -- it normally just prints out the exception. The
1411 -- handler must be recursive, in case showing the exception causes
1412 -- more exceptions to be raised.
1414 -- Bugfix: if the user closed stdout or stderr, the flushing will fail,
1415 -- raising another exception. We therefore don't put the recursive
1416 -- handler arond the flushing operation, so if stderr is closed
1417 -- GHCi will just die gracefully rather than going into an infinite loop.
1418 handler :: Exception -> GHCi Bool
1420 handler exception = do
1422 io installSignalHandlers
1423 ghciHandle handler (showException exception >> return False)
1425 showException (DynException dyn) =
1426 case fromDynamic dyn of
1427 Nothing -> io (putStrLn ("*** Exception: (unknown)"))
1428 Just Interrupted -> io (putStrLn "Interrupted.")
1429 Just (CmdLineError s) -> io (putStrLn s) -- omit the location for CmdLineError
1430 Just ph@PhaseFailed{} -> io (putStrLn (showGhcException ph "")) -- ditto
1431 Just other_ghc_ex -> io (print other_ghc_ex)
1433 showException other_exception
1434 = io (putStrLn ("*** Exception: " ++ show other_exception))
1436 -----------------------------------------------------------------------------
1437 -- recursive exception handlers
1439 -- Don't forget to unblock async exceptions in the handler, or if we're
1440 -- in an exception loop (eg. let a = error a in a) the ^C exception
1441 -- may never be delivered. Thanks to Marcin for pointing out the bug.
1443 ghciHandle :: (Exception -> GHCi a) -> GHCi a -> GHCi a
1444 ghciHandle h (GHCi m) = GHCi $ \s ->
1445 Exception.catch (m s)
1446 (\e -> unGHCi (ghciUnblock (h e)) s)
1448 ghciUnblock :: GHCi a -> GHCi a
1449 ghciUnblock (GHCi a) = GHCi $ \s -> Exception.unblock (a s)
1452 -- ----------------------------------------------------------------------------
1455 expandPath :: String -> GHCi String
1457 case dropWhile isSpace path of
1459 tilde <- io (getEnv "HOME") -- will fail if HOME not defined
1460 return (tilde ++ '/':d)
1464 wantInterpretedModule :: String -> GHCi Module
1465 wantInterpretedModule str = do
1466 session <- getSession
1467 modl <- lookupModule str
1468 is_interpreted <- io (GHC.moduleIsInterpreted session modl)
1469 when (not is_interpreted) $
1470 throwDyn (CmdLineError ("module '" ++ str ++ "' is not interpreted"))
1473 wantNameFromInterpretedModule noCanDo str and_then = do
1474 session <- getSession
1475 names <- io $ GHC.parseName session str
1479 let modl = GHC.nameModule n
1480 is_interpreted <- io (GHC.moduleIsInterpreted session modl)
1481 if not is_interpreted
1482 then noCanDo n $ text "module " <> ppr modl <>
1483 text " is not interpreted"
1486 -- ----------------------------------------------------------------------------
1487 -- Windows console setup
1489 setUpConsole :: IO ()
1491 #ifdef mingw32_HOST_OS
1492 -- On Windows we need to set a known code page, otherwise the characters
1493 -- we read from the console will be be in some strange encoding, and
1494 -- similarly for characters we write to the console.
1496 -- At the moment, GHCi pretends all input is Latin-1. In the
1497 -- future we should support UTF-8, but for now we set the code pages
1500 -- It seems you have to set the font in the console window to
1501 -- a Unicode font in order for output to work properly,
1502 -- otherwise non-ASCII characters are mapped wrongly. sigh.
1503 -- (see MSDN for SetConsoleOutputCP()).
1505 setConsoleCP 28591 -- ISO Latin-1
1506 setConsoleOutputCP 28591 -- ISO Latin-1
1510 -- -----------------------------------------------------------------------------
1511 -- commands for debugger
1513 sprintCmd = pprintCommand False False
1514 printCmd = pprintCommand True False
1515 forceCmd = pprintCommand False True
1517 pprintCommand bind force str = do
1518 session <- getSession
1519 io $ pprintClosureCommand session bind force str
1521 stepCmd :: String -> GHCi ()
1522 stepCmd [] = doContinue GHC.SingleStep
1523 stepCmd expression = do runStmt expression GHC.SingleStep; return ()
1525 traceCmd :: String -> GHCi ()
1526 traceCmd [] = doContinue GHC.RunAndLogSteps
1527 traceCmd expression = do runStmt expression GHC.RunAndLogSteps; return ()
1529 continueCmd :: String -> GHCi ()
1530 continueCmd = noArgs $ doContinue GHC.RunToCompletion
1532 doContinue :: SingleStep -> GHCi ()
1533 doContinue step = do
1534 session <- getSession
1535 runResult <- io $ GHC.resume session step
1536 afterRunStmt runResult
1539 abandonCmd :: String -> GHCi ()
1540 abandonCmd = noArgs $ do
1542 b <- io $ GHC.abandon s -- the prompt will change to indicate the new context
1543 when (not b) $ io $ putStrLn "There is no computation running."
1546 deleteCmd :: String -> GHCi ()
1547 deleteCmd argLine = do
1548 deleteSwitch $ words argLine
1550 deleteSwitch :: [String] -> GHCi ()
1552 io $ putStrLn "The delete command requires at least one argument."
1553 -- delete all break points
1554 deleteSwitch ("*":_rest) = discardActiveBreakPoints
1555 deleteSwitch idents = do
1556 mapM_ deleteOneBreak idents
1558 deleteOneBreak :: String -> GHCi ()
1560 | all isDigit str = deleteBreak (read str)
1561 | otherwise = return ()
1563 historyCmd :: String -> GHCi ()
1565 | null arg = history 20
1566 | all isDigit arg = history (read arg)
1567 | otherwise = io $ putStrLn "Syntax: :history [num]"
1571 resumes <- io $ GHC.getResumeContext s
1573 [] -> io $ putStrLn "Not stopped at a breakpoint"
1575 let hist = GHC.resumeHistory r
1576 (took,rest) = splitAt num hist
1577 spans <- mapM (io . GHC.getHistorySpan s) took
1578 let nums = map (printf "-%-3d:") [(1::Int)..]
1579 printForUser (vcat (zipWith (<+>) (map text nums) (map ppr spans)))
1580 io $ putStrLn $ if null rest then "<end of history>" else "..."
1582 backCmd :: String -> GHCi ()
1583 backCmd = noArgs $ do
1585 (names, ix, span) <- io $ GHC.back s
1586 printForUser $ ptext SLIT("Logged breakpoint at") <+> ppr span
1587 mapM_ (showTypeOfName s) names
1588 -- run the command set with ":set stop <cmd>"
1590 enqueueCommands [stop st]
1592 forwardCmd :: String -> GHCi ()
1593 forwardCmd = noArgs $ do
1595 (names, ix, span) <- io $ GHC.forward s
1596 printForUser $ (if (ix == 0)
1597 then ptext SLIT("Stopped at")
1598 else ptext SLIT("Logged breakpoint at")) <+> ppr span
1599 mapM_ (showTypeOfName s) names
1600 -- run the command set with ":set stop <cmd>"
1602 enqueueCommands [stop st]
1604 -- handle the "break" command
1605 breakCmd :: String -> GHCi ()
1606 breakCmd argLine = do
1607 session <- getSession
1608 breakSwitch session $ words argLine
1610 breakSwitch :: Session -> [String] -> GHCi ()
1611 breakSwitch _session [] = do
1612 io $ putStrLn "The break command requires at least one argument."
1613 breakSwitch session args@(arg1:rest)
1614 | looksLikeModuleName arg1 = do
1615 mod <- wantInterpretedModule arg1
1616 breakByModule session mod rest
1617 | all isDigit arg1 = do
1618 (toplevel, _) <- io $ GHC.getContext session
1620 (mod : _) -> breakByModuleLine mod (read arg1) rest
1622 io $ putStrLn "Cannot find default module for breakpoint."
1623 io $ putStrLn "Perhaps no modules are loaded for debugging?"
1624 | otherwise = do -- try parsing it as an identifier
1625 wantNameFromInterpretedModule noCanDo arg1 $ \name -> do
1626 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
1627 if GHC.isGoodSrcLoc loc
1628 then findBreakAndSet (GHC.nameModule name) $
1629 findBreakByCoord (Just (GHC.srcLocFile loc))
1630 (GHC.srcLocLine loc,
1632 else noCanDo name $ text "can't find its location: " <> ppr loc
1634 noCanDo n why = printForUser $
1635 text "cannot set breakpoint on " <> ppr n <> text ": " <> why
1637 breakByModule :: Session -> Module -> [String] -> GHCi ()
1638 breakByModule session mod args@(arg1:rest)
1639 | all isDigit arg1 = do -- looks like a line number
1640 breakByModuleLine mod (read arg1) rest
1641 | otherwise = io $ putStrLn "Invalid arguments to :break"
1643 breakByModuleLine :: Module -> Int -> [String] -> GHCi ()
1644 breakByModuleLine mod line args
1645 | [] <- args = findBreakAndSet mod $ findBreakByLine line
1646 | [col] <- args, all isDigit col =
1647 findBreakAndSet mod $ findBreakByCoord Nothing (line, read col)
1648 | otherwise = io $ putStrLn "Invalid arguments to :break"
1650 findBreakAndSet :: Module -> (TickArray -> Maybe (Int, SrcSpan)) -> GHCi ()
1651 findBreakAndSet mod lookupTickTree = do
1652 tickArray <- getTickArray mod
1653 (breakArray, _) <- getModBreak mod
1654 case lookupTickTree tickArray of
1655 Nothing -> io $ putStrLn $ "No breakpoints found at that location."
1656 Just (tick, span) -> do
1657 success <- io $ setBreakFlag True breakArray tick
1658 session <- getSession
1662 recordBreak $ BreakLocation
1669 text "Breakpoint " <> ppr nm <>
1671 then text " was already set at " <> ppr span
1672 else text " activated at " <> ppr span
1674 printForUser $ text "Breakpoint could not be activated at"
1677 -- When a line number is specified, the current policy for choosing
1678 -- the best breakpoint is this:
1679 -- - the leftmost complete subexpression on the specified line, or
1680 -- - the leftmost subexpression starting on the specified line, or
1681 -- - the rightmost subexpression enclosing the specified line
1683 findBreakByLine :: Int -> TickArray -> Maybe (BreakIndex,SrcSpan)
1684 findBreakByLine line arr
1685 | not (inRange (bounds arr) line) = Nothing
1687 listToMaybe (sortBy leftmost_largest complete) `mplus`
1688 listToMaybe (sortBy leftmost_smallest incomplete) `mplus`
1689 listToMaybe (sortBy rightmost ticks)
1693 starts_here = [ tick | tick@(nm,span) <- ticks,
1694 GHC.srcSpanStartLine span == line ]
1696 (complete,incomplete) = partition ends_here starts_here
1697 where ends_here (nm,span) = GHC.srcSpanEndLine span == line
1699 findBreakByCoord :: Maybe FastString -> (Int,Int) -> TickArray
1700 -> Maybe (BreakIndex,SrcSpan)
1701 findBreakByCoord mb_file (line, col) arr
1702 | not (inRange (bounds arr) line) = Nothing
1704 listToMaybe (sortBy rightmost contains) `mplus`
1705 listToMaybe (sortBy leftmost_smallest after_here)
1709 -- the ticks that span this coordinate
1710 contains = [ tick | tick@(nm,span) <- ticks, span `spans` (line,col),
1711 is_correct_file span ]
1713 is_correct_file span
1714 | Just f <- mb_file = GHC.srcSpanFile span == f
1717 after_here = [ tick | tick@(nm,span) <- ticks,
1718 GHC.srcSpanStartLine span == line,
1719 GHC.srcSpanStartCol span >= col ]
1722 leftmost_smallest (_,a) (_,b) = a `compare` b
1723 leftmost_largest (_,a) (_,b) = (GHC.srcSpanStart a `compare` GHC.srcSpanStart b)
1725 (GHC.srcSpanEnd b `compare` GHC.srcSpanEnd a)
1726 rightmost (_,a) (_,b) = b `compare` a
1728 spans :: SrcSpan -> (Int,Int) -> Bool
1729 spans span (l,c) = GHC.srcSpanStart span <= loc && loc <= GHC.srcSpanEnd span
1730 where loc = GHC.mkSrcLoc (GHC.srcSpanFile span) l c
1732 -- for now, use ANSI bold on Unixy systems. On Windows, we add a line
1733 -- of carets under the active expression instead. The Windows console
1734 -- doesn't support ANSI escape sequences, and most Unix terminals
1735 -- (including xterm) do, so this is a reasonable guess until we have a
1736 -- proper termcap/terminfo library.
1737 #if !defined(mingw32_TARGET_OS)
1743 start_bold = BS.pack "\ESC[1m"
1744 end_bold = BS.pack "\ESC[0m"
1746 listCmd :: String -> GHCi ()
1748 mb_span <- getCurrentBreakSpan
1750 Nothing -> printForUser $ text "not stopped at a breakpoint; nothing to list"
1751 Just span | GHC.isGoodSrcSpan span -> io $ listAround span True
1752 | otherwise -> printForUser $ text "unable to list source for" <+> ppr span
1753 listCmd str = list2 (words str)
1755 list2 [arg] | all isDigit arg = do
1756 session <- getSession
1757 (toplevel, _) <- io $ GHC.getContext session
1759 [] -> io $ putStrLn "No module to list"
1760 (mod : _) -> listModuleLine mod (read arg)
1761 list2 [arg1,arg2] | looksLikeModuleName arg1, all isDigit arg2 = do
1762 mod <- wantInterpretedModule arg1
1763 listModuleLine mod (read arg2)
1765 wantNameFromInterpretedModule noCanDo arg $ \name -> do
1766 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
1767 if GHC.isGoodSrcLoc loc
1769 tickArray <- getTickArray (GHC.nameModule name)
1770 let mb_span = findBreakByCoord (Just (GHC.srcLocFile loc))
1771 (GHC.srcLocLine loc, GHC.srcLocCol loc)
1774 Nothing -> io $ listAround (GHC.srcLocSpan loc) False
1775 Just (_,span) -> io $ listAround span False
1777 noCanDo name $ text "can't find its location: " <>
1780 noCanDo n why = printForUser $
1781 text "cannot list source code for " <> ppr n <> text ": " <> why
1783 io $ putStrLn "syntax: :list [<line> | <module> <line> | <identifier>]"
1785 listModuleLine :: Module -> Int -> GHCi ()
1786 listModuleLine modl line = do
1787 session <- getSession
1788 graph <- io (GHC.getModuleGraph session)
1789 let this = filter ((== modl) . GHC.ms_mod) graph
1791 [] -> panic "listModuleLine"
1793 let filename = fromJust (ml_hs_file (GHC.ms_location summ))
1794 loc = GHC.mkSrcLoc (mkFastString (filename)) line 0
1795 io $ listAround (GHC.srcLocSpan loc) False
1797 -- | list a section of a source file around a particular SrcSpan.
1798 -- If the highlight flag is True, also highlight the span using
1799 -- start_bold/end_bold.
1800 listAround span do_highlight = do
1802 contents <- BS.readFile (pwd </> unpackFS file)
1804 lines = BS.split '\n' contents
1805 these_lines = take (line2 - line1 + 1 + pad_before + pad_after) $
1806 drop (line1 - 1 - pad_before) $ lines
1807 fst_line = max 1 (line1 - pad_before)
1808 line_nos = [ fst_line .. ]
1810 highlighted | do_highlight = zipWith highlight line_nos these_lines
1811 | otherwise = these_lines
1813 bs_line_nos = [ BS.pack (show l ++ " ") | l <- line_nos ]
1814 prefixed = zipWith BS.append bs_line_nos highlighted
1816 BS.putStrLn (BS.join (BS.pack "\n") prefixed)
1818 file = GHC.srcSpanFile span
1819 line1 = GHC.srcSpanStartLine span
1820 col1 = GHC.srcSpanStartCol span
1821 line2 = GHC.srcSpanEndLine span
1822 col2 = GHC.srcSpanEndCol span
1824 pad_before | line1 == 1 = 0
1828 highlight | do_bold = highlight_bold
1829 | otherwise = highlight_carets
1831 highlight_bold no line
1832 | no == line1 && no == line2
1833 = let (a,r) = BS.splitAt col1 line
1834 (b,c) = BS.splitAt (col2-col1) r
1836 BS.concat [a,start_bold,b,end_bold,c]
1838 = let (a,b) = BS.splitAt col1 line in
1839 BS.concat [a, start_bold, b]
1841 = let (a,b) = BS.splitAt col2 line in
1842 BS.concat [a, end_bold, b]
1845 highlight_carets no line
1846 | no == line1 && no == line2
1847 = BS.concat [line, nl, indent, BS.replicate col1 ' ',
1848 BS.replicate (col2-col1) '^']
1850 = BS.concat [line, nl, indent, BS.replicate col1 ' ',
1851 BS.replicate (BS.length line-col1) '^']
1853 = BS.concat [line, nl, indent, BS.replicate col2 '^']
1856 indent = BS.pack " "
1857 nl = BS.singleton '\n'
1859 -- --------------------------------------------------------------------------
1862 getTickArray :: Module -> GHCi TickArray
1863 getTickArray modl = do
1865 let arrmap = tickarrays st
1866 case lookupModuleEnv arrmap modl of
1867 Just arr -> return arr
1869 (breakArray, ticks) <- getModBreak modl
1870 let arr = mkTickArray (assocs ticks)
1871 setGHCiState st{tickarrays = extendModuleEnv arrmap modl arr}
1874 discardTickArrays :: GHCi ()
1875 discardTickArrays = do
1877 setGHCiState st{tickarrays = emptyModuleEnv}
1879 mkTickArray :: [(BreakIndex,SrcSpan)] -> TickArray
1881 = accumArray (flip (:)) [] (1, max_line)
1882 [ (line, (nm,span)) | (nm,span) <- ticks,
1883 line <- srcSpanLines span ]
1885 max_line = foldr max 0 (map GHC.srcSpanEndLine (map snd ticks))
1886 srcSpanLines span = [ GHC.srcSpanStartLine span ..
1887 GHC.srcSpanEndLine span ]
1889 lookupModule :: String -> GHCi Module
1890 lookupModule modName
1891 = do session <- getSession
1892 io (GHC.findModule session (GHC.mkModuleName modName) Nothing)
1894 -- don't reset the counter back to zero?
1895 discardActiveBreakPoints :: GHCi ()
1896 discardActiveBreakPoints = do
1898 mapM (turnOffBreak.snd) (breaks st)
1899 setGHCiState $ st { breaks = [] }
1901 deleteBreak :: Int -> GHCi ()
1902 deleteBreak identity = do
1904 let oldLocations = breaks st
1905 (this,rest) = partition (\loc -> fst loc == identity) oldLocations
1907 then printForUser (text "Breakpoint" <+> ppr identity <+>
1908 text "does not exist")
1910 mapM (turnOffBreak.snd) this
1911 setGHCiState $ st { breaks = rest }
1913 turnOffBreak loc = do
1914 (arr, _) <- getModBreak (breakModule loc)
1915 io $ setBreakFlag False arr (breakTick loc)
1917 getModBreak :: Module -> GHCi (GHC.BreakArray, Array Int SrcSpan)
1918 getModBreak mod = do
1919 session <- getSession
1920 Just mod_info <- io $ GHC.getModuleInfo session mod
1921 let modBreaks = GHC.modInfoModBreaks mod_info
1922 let array = GHC.modBreaks_flags modBreaks
1923 let ticks = GHC.modBreaks_locs modBreaks
1924 return (array, ticks)
1926 setBreakFlag :: Bool -> GHC.BreakArray -> Int -> IO Bool
1927 setBreakFlag toggle array index
1928 | toggle = GHC.setBreakOn array index
1929 | otherwise = GHC.setBreakOff array index