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
76 import Control.Monad as Monad
79 import Foreign.StablePtr ( newStablePtr )
80 import GHC.Exts ( unsafeCoerce# )
81 import GHC.IOBase ( IOErrorType(InvalidArgument) )
83 import Data.IORef ( IORef, readIORef, writeIORef )
85 import System.Posix.Internals ( setNonBlockingFD )
87 -----------------------------------------------------------------------------
91 " / _ \\ /\\ /\\/ __(_)\n"++
92 " / /_\\// /_/ / / | | GHC Interactive, version " ++ cProjectVersion ++ ", for Haskell 98.\n"++
93 "/ /_\\\\/ __ / /___| | http://www.haskell.org/ghc/\n"++
94 "\\____/\\/ /_/\\____/|_| Type :? for help.\n"
96 type Command = (String, String -> GHCi Bool, Bool, String -> IO [String])
99 GLOBAL_VAR(commands, builtin_commands, [Command])
101 builtin_commands :: [Command]
103 -- Hugs users are accustomed to :e, so make sure it doesn't overlap
104 ("?", keepGoing help, False, completeNone),
105 ("add", keepGoingPaths addModule, False, completeFilename),
106 ("abandon", keepGoing abandonCmd, False, completeNone),
107 ("break", keepGoing breakCmd, False, completeIdentifier),
108 ("back", keepGoing backCmd, False, completeNone),
109 ("browse", keepGoing browseCmd, False, completeModule),
110 ("cd", keepGoing changeDirectory, False, completeFilename),
111 ("check", keepGoing checkModule, False, completeHomeModule),
112 ("continue", continueCmd, False, completeNone),
113 ("ctags", keepGoing createCTagsFileCmd, False, completeFilename),
114 ("def", keepGoing defineMacro, False, completeIdentifier),
115 ("delete", keepGoing deleteCmd, False, completeNone),
116 ("e", keepGoing editFile, False, completeFilename),
117 ("edit", keepGoing editFile, False, completeFilename),
118 ("etags", keepGoing createETagsFileCmd, False, completeFilename),
119 ("force", keepGoing forceCmd, False, completeIdentifier),
120 ("forward", keepGoing forwardCmd, False, completeNone),
121 ("help", keepGoing help, False, completeNone),
122 ("history", keepGoing historyCmd, False, completeNone),
123 ("info", keepGoing info, False, completeIdentifier),
124 ("kind", keepGoing kindOfType, False, completeIdentifier),
125 ("load", keepGoingPaths loadModule_, False, completeHomeModuleOrFile),
126 ("list", keepGoing listCmd, False, completeNone),
127 ("module", keepGoing setContext, False, completeModule),
128 ("main", keepGoing runMain, False, completeIdentifier),
129 ("print", keepGoing printCmd, False, completeIdentifier),
130 ("quit", quit, False, completeNone),
131 ("reload", keepGoing reloadModule, False, completeNone),
132 ("set", keepGoing setCmd, True, completeSetOptions),
133 ("show", keepGoing showCmd, False, completeNone),
134 ("sprint", keepGoing sprintCmd, False, completeIdentifier),
135 ("step", stepCmd, False, completeIdentifier),
136 ("type", keepGoing typeOfExpr, False, completeIdentifier),
137 ("trace", traceCmd, False, completeIdentifier),
138 ("undef", keepGoing undefineMacro, False, completeMacro),
139 ("unset", keepGoing unsetOptions, True, completeSetOptions)
142 keepGoing :: (String -> GHCi ()) -> (String -> GHCi Bool)
143 keepGoing a str = a str >> return False
145 keepGoingPaths :: ([FilePath] -> GHCi ()) -> (String -> GHCi Bool)
146 keepGoingPaths a str = a (toArgs str) >> return False
148 shortHelpText = "use :? for help.\n"
151 " Commands available from the prompt:\n" ++
153 " <statement> evaluate/run <statement>\n" ++
154 " :add <filename> ... add module(s) to the current target set\n" ++
155 " :browse [*]<module> display the names defined by <module>\n" ++
156 " :cd <dir> change directory to <dir>\n" ++
157 " :ctags [<file>] create tags file for Vi (default: \"tags\")\n" ++
158 " :def <cmd> <expr> define a command :<cmd>\n" ++
159 " :edit <file> edit file\n" ++
160 " :edit edit last module\n" ++
161 " :etags [<file>] create tags file for Emacs (default: \"TAGS\")\n" ++
162 " :help, :? display this list of commands\n" ++
163 " :info [<name> ...] display information about the given names\n" ++
164 " :kind <type> show the kind of <type>\n" ++
165 " :load <filename> ... load module(s) and their dependents\n" ++
166 " :module [+/-] [*]<mod> ... set the context for expression evaluation\n" ++
167 " :main [<arguments> ...] run the main function with the given arguments\n" ++
168 " :quit exit GHCi\n" ++
169 " :reload reload the current module set\n" ++
170 " :type <expr> show the type of <expr>\n" ++
171 " :undef <cmd> undefine user-defined command :<cmd>\n" ++
172 " :!<command> run the shell command <command>\n" ++
174 " -- Commands for debugging:\n" ++
176 " :abandon at a breakpoint, abandon current computation\n" ++
177 " :back go back in the history (after :trace)\n" ++
178 " :break [<mod>] <l> [<col>] set a breakpoint at the specified location\n" ++
179 " :break <name> set a breakpoint on the specified function\n" ++
180 " :continue resume after a breakpoint\n" ++
181 " :delete <number> delete the specified breakpoint\n" ++
182 " :delete * delete all breakpoints\n" ++
183 " :force <expr> print <expr>, forcing unevaluated parts\n" ++
184 " :forward go forward in the history (after :back)\n" ++
185 " :history [<n>] show the last <n> items in the history (after :trace)\n" ++
186 " :print [<name> ...] prints a value without forcing its computation\n" ++
187 " :step single-step after stopping at a breakpoint\n"++
188 " :step <expr> single-step into <expr>\n"++
189 " :trace trace after stopping at a breakpoint\n"++
190 " :trace <expr> trace into <expr> (remembers breakpoints for :history)\n"++
191 " :sprint [<name> ...] simplifed version of :print\n" ++
194 " -- Commands for changing settings:\n" ++
196 " :set <option> ... set options\n" ++
197 " :set args <arg> ... set the arguments returned by System.getArgs\n" ++
198 " :set prog <progname> set the value returned by System.getProgName\n" ++
199 " :set prompt <prompt> set the prompt used in GHCi\n" ++
200 " :set editor <cmd> set the command used for :edit\n" ++
201 " :set stop <cmd> set the command to run when a breakpoint is hit\n" ++
202 " :unset <option> ... unset options\n" ++
204 " Options for ':set' and ':unset':\n" ++
206 " +r revert top-level expressions after each evaluation\n" ++
207 " +s print timing/memory stats after each evaluation\n" ++
208 " +t print type after evaluation\n" ++
209 " -<flags> most GHC command line flags can also be set here\n" ++
210 " (eg. -v2, -fglasgow-exts, etc.)\n" ++
212 " -- Commands for displaying information:\n" ++
214 " :show bindings show the current bindings made at the prompt\n" ++
215 " :show breaks show the active breakpoints\n" ++
216 " :show context show the breakpoint context\n" ++
217 " :show modules show the currently loaded modules\n" ++
218 " :show <setting> show anything that can be set with :set (e.g. args)\n" ++
225 win <- System.Win32.getWindowsDirectory
226 return (win `joinFileName` "notepad.exe")
231 interactiveUI :: Session -> [(FilePath, Maybe Phase)] -> Maybe String -> IO ()
232 interactiveUI session srcs maybe_expr = do
233 -- HACK! If we happen to get into an infinite loop (eg the user
234 -- types 'let x=x in x' at the prompt), then the thread will block
235 -- on a blackhole, and become unreachable during GC. The GC will
236 -- detect that it is unreachable and send it the NonTermination
237 -- exception. However, since the thread is unreachable, everything
238 -- it refers to might be finalized, including the standard Handles.
239 -- This sounds like a bug, but we don't have a good solution right
245 -- Initialise buffering for the *interpreted* I/O system
246 initInterpBuffering session
248 when (isNothing maybe_expr) $ do
249 -- Only for GHCi (not runghc and ghc -e):
250 -- Turn buffering off for the compiled program's stdout/stderr
252 -- Turn buffering off for GHCi's stdout
254 hSetBuffering stdout NoBuffering
255 -- We don't want the cmd line to buffer any input that might be
256 -- intended for the program, so unbuffer stdin.
257 hSetBuffering stdin NoBuffering
259 -- initial context is just the Prelude
260 prel_mod <- GHC.findModule session prel_name (Just basePackageId)
261 GHC.setContext session [] [prel_mod]
265 Readline.setAttemptedCompletionFunction (Just completeWord)
266 --Readline.parseAndBind "set show-all-if-ambiguous 1"
268 let symbols = "!#$%&*+/<=>?@\\^|-~"
269 specials = "(),;[]`{}"
271 word_break_chars = spaces ++ specials ++ symbols
273 Readline.setBasicWordBreakCharacters word_break_chars
274 Readline.setCompleterWordBreakCharacters word_break_chars
277 default_editor <- findEditor
279 startGHCi (runGHCi srcs maybe_expr)
280 GHCiState{ progname = "<interactive>",
284 editor = default_editor,
290 tickarrays = emptyModuleEnv
294 Readline.resetTerminal Nothing
299 prel_name = GHC.mkModuleName "Prelude"
301 runGHCi :: [(FilePath, Maybe Phase)] -> Maybe String -> GHCi ()
302 runGHCi paths maybe_expr = do
303 let read_dot_files = not opt_IgnoreDotGhci
305 when (read_dot_files) $ do
308 exists <- io (doesFileExist file)
310 dir_ok <- io (checkPerms ".")
311 file_ok <- io (checkPerms file)
312 when (dir_ok && file_ok) $ do
313 either_hdl <- io (IO.try (openFile "./.ghci" ReadMode))
316 Right hdl -> fileLoop hdl False
318 when (read_dot_files) $ do
319 -- Read in $HOME/.ghci
320 either_dir <- io (IO.try (getEnv "HOME"))
324 cwd <- io (getCurrentDirectory)
325 when (dir /= cwd) $ do
326 let file = dir ++ "/.ghci"
327 ok <- io (checkPerms file)
329 either_hdl <- io (IO.try (openFile file ReadMode))
332 Right hdl -> fileLoop hdl False
334 -- Perform a :load for files given on the GHCi command line
335 -- When in -e mode, if the load fails then we want to stop
336 -- immediately rather than going on to evaluate the expression.
337 when (not (null paths)) $ do
338 ok <- ghciHandle (\e -> do showException e; return Failed) $
340 when (isJust maybe_expr && failed ok) $
341 io (exitWith (ExitFailure 1))
343 -- if verbosity is greater than 0, or we are connected to a
344 -- terminal, display the prompt in the interactive loop.
345 is_tty <- io (hIsTerminalDevice stdin)
346 dflags <- getDynFlags
347 let show_prompt = verbosity dflags > 0 || is_tty
352 #if defined(mingw32_HOST_OS)
353 -- The win32 Console API mutates the first character of
354 -- type-ahead when reading from it in a non-buffered manner. Work
355 -- around this by flushing the input buffer of type-ahead characters,
356 -- but only if stdin is available.
357 flushed <- io (IO.try (GHC.ConsoleHandler.flushConsole stdin))
359 Left err | isDoesNotExistError err -> return ()
360 | otherwise -> io (ioError err)
361 Right () -> return ()
363 -- initialise the console if necessary
366 -- enter the interactive loop
367 interactiveLoop is_tty show_prompt
369 -- just evaluate the expression we were given
374 io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
377 interactiveLoop is_tty show_prompt =
378 -- Ignore ^C exceptions caught here
379 ghciHandleDyn (\e -> case e of
381 #if defined(mingw32_HOST_OS)
384 interactiveLoop is_tty show_prompt
385 _other -> return ()) $
387 ghciUnblock $ do -- unblock necessary if we recursed from the
388 -- exception handler above.
390 -- read commands from stdin
394 else fileLoop stdin show_prompt
396 fileLoop stdin show_prompt
400 -- NOTE: We only read .ghci files if they are owned by the current user,
401 -- and aren't world writable. Otherwise, we could be accidentally
402 -- running code planted by a malicious third party.
404 -- Furthermore, We only read ./.ghci if . is owned by the current user
405 -- and isn't writable by anyone else. I think this is sufficient: we
406 -- don't need to check .. and ../.. etc. because "." always refers to
407 -- the same directory while a process is running.
409 checkPerms :: String -> IO Bool
411 #ifdef mingw32_HOST_OS
414 Util.handle (\_ -> return False) $ do
415 st <- getFileStatus name
417 if fileOwner st /= me then do
418 putStrLn $ "WARNING: " ++ name ++ " is owned by someone else, IGNORING!"
421 let mode = fileMode st
422 if (groupWriteMode == (mode `intersectFileModes` groupWriteMode))
423 || (otherWriteMode == (mode `intersectFileModes` otherWriteMode))
425 putStrLn $ "*** WARNING: " ++ name ++
426 " is writable by someone else, IGNORING!"
431 fileLoop :: Handle -> Bool -> GHCi ()
432 fileLoop hdl show_prompt = do
433 when show_prompt $ do
436 l <- io (IO.try (hGetLine hdl))
438 Left e | isEOFError e -> return ()
439 | InvalidArgument <- etype -> return ()
440 | otherwise -> io (ioError e)
441 where etype = ioeGetErrorType e
442 -- treat InvalidArgument in the same way as EOF:
443 -- this can happen if the user closed stdin, or
444 -- perhaps did getContents which closes stdin at
447 case removeSpaces l of
448 "" -> fileLoop hdl show_prompt
449 l -> do quit <- runCommand l
450 if quit then return () else fileLoop hdl show_prompt
452 stringLoop :: [String] -> GHCi Bool{-True: we quit-}
453 stringLoop [] = return False
454 stringLoop (s:ss) = do
455 case removeSpaces s of
457 l -> do quit <- runCommand l
458 if quit then return True else stringLoop ss
461 session <- getSession
462 (toplevs,exports) <- io (GHC.getContext session)
463 resumes <- io $ GHC.getResumeContext session
469 let ix = GHC.resumeHistoryIx r
471 then return (brackets (ppr (GHC.resumeSpan r)) <> space)
473 let hist = GHC.resumeHistory r !! (ix-1)
474 span <- io $ GHC.getHistorySpan session hist
475 return (brackets (ppr (negate ix) <> char ':'
476 <+> ppr span) <> space)
478 dots | r:rs <- resumes, not (null rs) = text "... "
482 hsep (map (\m -> char '*' <> ppr (GHC.moduleName m)) toplevs) <+>
483 hsep (map (ppr . GHC.moduleName) exports)
485 deflt_prompt = dots <> context_bit <> modules_bit
487 f ('%':'s':xs) = deflt_prompt <> f xs
488 f ('%':'%':xs) = char '%' <> f xs
489 f (x:xs) = char x <> f xs
493 return (showSDoc (f (prompt st)))
497 readlineLoop :: GHCi ()
499 session <- getSession
500 (mod,imports) <- io (GHC.getContext session)
502 saveSession -- for use by completion
504 mb_span <- getCurrentBreakSpan
506 l <- io (readline prompt `finally` setNonBlockingFD 0)
507 -- readline sometimes puts stdin into blocking mode,
508 -- so we need to put it back for the IO library
513 case removeSpaces l of
518 if quit then return () else readlineLoop
521 runCommand :: String -> GHCi Bool
522 runCommand c = ghciHandle handler (doCommand c)
524 doCommand (':' : command) = specialCommand command
526 = do timeIt $ runStmt stmt GHC.RunToCompletion
529 -- This version is for the GHC command-line option -e. The only difference
530 -- from runCommand is that it catches the ExitException exception and
531 -- exits, rather than printing out the exception.
532 runCommandEval c = ghciHandle handleEval (doCommand c)
534 handleEval (ExitException code) = io (exitWith code)
535 handleEval e = do handler e
536 io (exitWith (ExitFailure 1))
538 doCommand (':' : command) = specialCommand command
540 = do r <- runStmt stmt GHC.RunToCompletion
542 False -> io (exitWith (ExitFailure 1))
543 -- failure to run the command causes exit(1) for ghc -e.
546 runStmt :: String -> SingleStep -> GHCi Bool
548 | null (filter (not.isSpace) stmt) = return False
550 = do st <- getGHCiState
551 session <- getSession
552 result <- io $ withProgName (progname st) $ withArgs (args st) $
553 GHC.runStmt session stmt step
555 return (isRunResultOk result)
558 afterRunStmt :: GHC.RunResult -> GHCi (Maybe (Bool,[Name]))
559 afterRunStmt run_result = do
560 mb_result <- switchOnRunResult run_result
561 -- possibly print the type and revert CAFs after evaluating an expression
562 show_types <- isOptionSet ShowType
563 session <- getSession
566 Just (is_break,names) ->
567 when (is_break || show_types) $
568 mapM_ (showTypeOfName session) names
571 io installSignalHandlers
572 b <- isOptionSet RevertCAFs
573 io (when b revertCAFs)
578 switchOnRunResult :: GHC.RunResult -> GHCi (Maybe (Bool,[Name]))
579 switchOnRunResult GHC.RunFailed = return Nothing
580 switchOnRunResult (GHC.RunException e) = throw e
581 switchOnRunResult (GHC.RunOk names) = return $ Just (False,names)
582 switchOnRunResult (GHC.RunBreak threadId names info) = do
583 session <- getSession
584 Just mod_info <- io $ GHC.getModuleInfo session (GHC.breakInfo_module info)
585 let modBreaks = GHC.modInfoModBreaks mod_info
586 let ticks = GHC.modBreaks_locs modBreaks
588 -- display information about the breakpoint
589 let location = ticks ! GHC.breakInfo_number info
590 printForUser $ ptext SLIT("Stopped at") <+> ppr location
592 -- run the command set with ":set stop <cmd>"
596 return (Just (True,names))
599 isRunResultOk :: GHC.RunResult -> Bool
600 isRunResultOk (GHC.RunOk _) = True
601 isRunResultOk _ = False
604 showTypeOfName :: Session -> Name -> GHCi ()
605 showTypeOfName session n
606 = do maybe_tything <- io (GHC.lookupName session n)
607 case maybe_tything of
609 Just thing -> showTyThing thing
611 specialCommand :: String -> GHCi Bool
612 specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
613 specialCommand str = do
614 let (cmd,rest) = break isSpace str
615 maybe_cmd <- io (lookupCommand cmd)
617 Nothing -> io (hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n"
618 ++ shortHelpText) >> return False)
619 Just (_,f,_,_) -> f (dropWhile isSpace rest)
621 lookupCommand :: String -> IO (Maybe Command)
622 lookupCommand str = do
623 cmds <- readIORef commands
624 -- look for exact match first, then the first prefix match
625 case [ c | c <- cmds, str == cmdName c ] of
626 c:_ -> return (Just c)
627 [] -> case [ c | c@(s,_,_,_) <- cmds, prefixMatch str s ] of
629 c:_ -> return (Just c)
632 getCurrentBreakSpan :: GHCi (Maybe SrcSpan)
633 getCurrentBreakSpan = do
634 session <- getSession
635 resumes <- io $ GHC.getResumeContext session
639 let ix = GHC.resumeHistoryIx r
641 then return (Just (GHC.resumeSpan r))
643 let hist = GHC.resumeHistory r !! (ix-1)
644 span <- io $ GHC.getHistorySpan session hist
647 -----------------------------------------------------------------------------
650 noArgs :: GHCi () -> String -> GHCi ()
652 noArgs m _ = io $ putStrLn "This command takes no arguments"
654 help :: String -> GHCi ()
655 help _ = io (putStr helpText)
657 info :: String -> GHCi ()
658 info "" = throwDyn (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
659 info s = do { let names = words s
660 ; session <- getSession
661 ; dflags <- getDynFlags
662 ; let exts = dopt Opt_GlasgowExts dflags
663 ; mapM_ (infoThing exts session) names }
665 infoThing exts session str = io $ do
666 names <- GHC.parseName session str
667 let filtered = filterOutChildren names
668 mb_stuffs <- mapM (GHC.getInfo session) filtered
669 unqual <- GHC.getPrintUnqual session
670 putStrLn (showSDocForUser unqual $
671 vcat (intersperse (text "") $
672 [ pprInfo exts stuff | Just stuff <- mb_stuffs ]))
674 -- Filter out names whose parent is also there Good
675 -- example is '[]', which is both a type and data
676 -- constructor in the same type
677 filterOutChildren :: [Name] -> [Name]
678 filterOutChildren names = filter (not . parent_is_there) names
679 where parent_is_there n
680 -- | Just p <- GHC.nameParent_maybe n = p `elem` names
684 pprInfo exts (thing, fixity, insts)
685 = pprTyThingInContextLoc exts thing
686 $$ show_fixity fixity
687 $$ vcat (map GHC.pprInstance insts)
690 | fix == GHC.defaultFixity = empty
691 | otherwise = ppr fix <+> ppr (GHC.getName thing)
693 runMain :: String -> GHCi ()
695 let ss = concat $ intersperse "," (map (\ s -> ('"':s)++"\"") (toArgs args))
696 runCommand $ '[': ss ++ "] `System.Environment.withArgs` main"
699 addModule :: [FilePath] -> GHCi ()
701 io (revertCAFs) -- always revert CAFs on load/add.
702 files <- mapM expandPath files
703 targets <- mapM (\m -> io (GHC.guessTarget m Nothing)) files
704 session <- getSession
705 io (mapM_ (GHC.addTarget session) targets)
706 ok <- io (GHC.load session LoadAllTargets)
709 changeDirectory :: String -> GHCi ()
710 changeDirectory dir = do
711 session <- getSession
712 graph <- io (GHC.getModuleGraph session)
713 when (not (null graph)) $
714 io $ putStr "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed.\n"
715 io (GHC.setTargets session [])
716 io (GHC.load session LoadAllTargets)
717 setContextAfterLoad session []
718 io (GHC.workingDirectoryChanged session)
719 dir <- expandPath dir
720 io (setCurrentDirectory dir)
722 editFile :: String -> GHCi ()
725 -- find the name of the "topmost" file loaded
726 session <- getSession
727 graph0 <- io (GHC.getModuleGraph session)
728 graph1 <- filterM (io . GHC.isLoaded session . GHC.ms_mod_name) graph0
729 let graph2 = flattenSCCs (GHC.topSortModuleGraph True graph1 Nothing)
730 case GHC.ml_hs_file (GHC.ms_location (last graph2)) of
731 Just file -> do_edit file
732 Nothing -> throwDyn (CmdLineError "unknown file name")
733 | otherwise = do_edit str
739 throwDyn (CmdLineError "editor not set, use :set editor")
740 io $ system (cmd ++ ' ':file)
743 defineMacro :: String -> GHCi ()
745 let (macro_name, definition) = break isSpace s
746 cmds <- io (readIORef commands)
748 then throwDyn (CmdLineError "invalid macro name")
750 if (macro_name `elem` map cmdName cmds)
751 then throwDyn (CmdLineError
752 ("command '" ++ macro_name ++ "' is already defined"))
755 -- give the expression a type signature, so we can be sure we're getting
756 -- something of the right type.
757 let new_expr = '(' : definition ++ ") :: String -> IO String"
759 -- compile the expression
761 maybe_hv <- io (GHC.compileExpr cms new_expr)
764 Just hv -> io (writeIORef commands --
765 (cmds ++ [(macro_name, runMacro hv, False, completeNone)]))
767 runMacro :: GHC.HValue{-String -> IO String-} -> String -> GHCi Bool
769 str <- io ((unsafeCoerce# fun :: String -> IO String) s)
770 stringLoop (lines str)
772 undefineMacro :: String -> GHCi ()
773 undefineMacro macro_name = do
774 cmds <- io (readIORef commands)
775 if (macro_name `elem` map cmdName builtin_commands)
776 then throwDyn (CmdLineError
777 ("command '" ++ macro_name ++ "' cannot be undefined"))
779 if (macro_name `notElem` map cmdName cmds)
780 then throwDyn (CmdLineError
781 ("command '" ++ macro_name ++ "' not defined"))
783 io (writeIORef commands (filter ((/= macro_name) . cmdName) cmds))
786 loadModule :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
787 loadModule fs = timeIt (loadModule' fs)
789 loadModule_ :: [FilePath] -> GHCi ()
790 loadModule_ fs = do loadModule (zip fs (repeat Nothing)); return ()
792 loadModule' :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
793 loadModule' files = do
794 session <- getSession
797 io (GHC.setTargets session [])
798 io (GHC.load session LoadAllTargets)
801 let (filenames, phases) = unzip files
802 exp_filenames <- mapM expandPath filenames
803 let files' = zip exp_filenames phases
804 targets <- io (mapM (uncurry GHC.guessTarget) files')
806 -- NOTE: we used to do the dependency anal first, so that if it
807 -- fails we didn't throw away the current set of modules. This would
808 -- require some re-working of the GHC interface, so we'll leave it
809 -- as a ToDo for now.
811 io (GHC.setTargets session targets)
812 ok <- io (GHC.load session LoadAllTargets)
816 checkModule :: String -> GHCi ()
818 let modl = GHC.mkModuleName m
819 session <- getSession
820 result <- io (GHC.checkModule session modl)
822 Nothing -> io $ putStrLn "Nothing"
823 Just r -> io $ putStrLn (showSDoc (
824 case GHC.checkedModuleInfo r of
825 Just cm | Just scope <- GHC.modInfoTopLevelScope cm ->
827 (local,global) = partition ((== modl) . GHC.moduleName . GHC.nameModule) scope
829 (text "global names: " <+> ppr global) $$
830 (text "local names: " <+> ppr local)
832 afterLoad (successIf (isJust result)) session
834 reloadModule :: String -> GHCi ()
836 io (revertCAFs) -- always revert CAFs on reload.
837 session <- getSession
838 ok <- io (GHC.load session LoadAllTargets)
841 io (revertCAFs) -- always revert CAFs on reload.
842 session <- getSession
843 ok <- io (GHC.load session (LoadUpTo (GHC.mkModuleName m)))
846 afterLoad ok session = do
847 io (revertCAFs) -- always revert CAFs on load.
849 discardActiveBreakPoints
850 graph <- io (GHC.getModuleGraph session)
851 graph' <- filterM (io . GHC.isLoaded session . GHC.ms_mod_name) graph
852 setContextAfterLoad session graph'
853 modulesLoadedMsg ok (map GHC.ms_mod_name graph')
855 setContextAfterLoad session [] = do
856 prel_mod <- getPrelude
857 io (GHC.setContext session [] [prel_mod])
858 setContextAfterLoad session ms = do
859 -- load a target if one is available, otherwise load the topmost module.
860 targets <- io (GHC.getTargets session)
861 case [ m | Just m <- map (findTarget ms) targets ] of
863 let graph' = flattenSCCs (GHC.topSortModuleGraph True ms Nothing) in
864 load_this (last graph')
869 = case filter (`matches` t) ms of
873 summary `matches` Target (TargetModule m) _
874 = GHC.ms_mod_name summary == m
875 summary `matches` Target (TargetFile f _) _
876 | Just f' <- GHC.ml_hs_file (GHC.ms_location summary) = f == f'
877 summary `matches` target
880 load_this summary | m <- GHC.ms_mod summary = do
881 b <- io (GHC.moduleIsInterpreted session m)
882 if b then io (GHC.setContext session [m] [])
884 prel_mod <- getPrelude
885 io (GHC.setContext session [] [prel_mod,m])
888 modulesLoadedMsg :: SuccessFlag -> [ModuleName] -> GHCi ()
889 modulesLoadedMsg ok mods = do
890 dflags <- getDynFlags
891 when (verbosity dflags > 0) $ do
893 | null mods = text "none."
895 punctuate comma (map ppr mods)) <> text "."
898 io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
900 io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
903 typeOfExpr :: String -> GHCi ()
905 = do cms <- getSession
906 maybe_ty <- io (GHC.exprType cms str)
909 Just ty -> do ty' <- cleanType ty
910 printForUser $ text str <> text " :: " <> ppr ty'
912 kindOfType :: String -> GHCi ()
914 = do cms <- getSession
915 maybe_ty <- io (GHC.typeKind cms str)
918 Just ty -> printForUser $ text str <> text " :: " <> ppr ty
920 quit :: String -> GHCi Bool
923 shellEscape :: String -> GHCi Bool
924 shellEscape str = io (system str >> return False)
926 -----------------------------------------------------------------------------
927 -- Browsing a module's contents
929 browseCmd :: String -> GHCi ()
932 ['*':m] | looksLikeModuleName m -> browseModule m False
933 [m] | looksLikeModuleName m -> browseModule m True
934 _ -> throwDyn (CmdLineError "syntax: :browse <module>")
936 browseModule m exports_only = do
938 modl <- if exports_only then lookupModule m
939 else wantInterpretedModule m
941 -- Temporarily set the context to the module we're interested in,
942 -- just so we can get an appropriate PrintUnqualified
943 (as,bs) <- io (GHC.getContext s)
944 prel_mod <- getPrelude
945 io (if exports_only then GHC.setContext s [] [prel_mod,modl]
946 else GHC.setContext s [modl] [])
947 unqual <- io (GHC.getPrintUnqual s)
948 io (GHC.setContext s as bs)
950 mb_mod_info <- io $ GHC.getModuleInfo s modl
952 Nothing -> throwDyn (CmdLineError ("unknown module: " ++ m))
955 | exports_only = GHC.modInfoExports mod_info
956 | otherwise = fromMaybe [] (GHC.modInfoTopLevelScope mod_info)
958 filtered = filterOutChildren names
960 things <- io $ mapM (GHC.lookupName s) filtered
962 dflags <- getDynFlags
963 let exts = dopt Opt_GlasgowExts dflags
964 io (putStrLn (showSDocForUser unqual (
965 vcat (map (pprTyThingInContext exts) (catMaybes things))
967 -- ToDo: modInfoInstances currently throws an exception for
968 -- package modules. When it works, we can do this:
969 -- $$ vcat (map GHC.pprInstance (GHC.modInfoInstances mod_info))
971 -----------------------------------------------------------------------------
972 -- Setting the module context
975 | all sensible mods = fn mods
976 | otherwise = throwDyn (CmdLineError "syntax: :module [+/-] [*]M1 ... [*]Mn")
978 (fn, mods) = case str of
979 '+':stuff -> (addToContext, words stuff)
980 '-':stuff -> (removeFromContext, words stuff)
981 stuff -> (newContext, words stuff)
983 sensible ('*':m) = looksLikeModuleName m
984 sensible m = looksLikeModuleName m
986 separate :: Session -> [String] -> [Module] -> [Module]
987 -> GHCi ([Module],[Module])
988 separate session [] as bs = return (as,bs)
989 separate session (('*':str):ms) as bs = do
990 m <- io $ GHC.findModule session (GHC.mkModuleName str) Nothing
991 b <- io $ GHC.moduleIsInterpreted session m
992 if b then separate session ms (m:as) bs
993 else throwDyn (CmdLineError ("module '"
994 ++ GHC.moduleNameString (GHC.moduleName m)
995 ++ "' is not interpreted"))
996 separate session (str:ms) as bs = do
997 m <- io $ GHC.findModule session (GHC.mkModuleName str) Nothing
998 separate session ms as (m:bs)
1000 newContext :: [String] -> GHCi ()
1001 newContext strs = do
1003 (as,bs) <- separate s strs [] []
1004 prel_mod <- getPrelude
1005 let bs' = if null as && prel_mod `notElem` bs then prel_mod:bs else bs
1006 io $ GHC.setContext s as bs'
1009 addToContext :: [String] -> GHCi ()
1010 addToContext strs = do
1012 (as,bs) <- io $ GHC.getContext s
1014 (new_as,new_bs) <- separate s strs [] []
1016 let as_to_add = new_as \\ (as ++ bs)
1017 bs_to_add = new_bs \\ (as ++ bs)
1019 io $ GHC.setContext s (as ++ as_to_add) (bs ++ bs_to_add)
1022 removeFromContext :: [String] -> GHCi ()
1023 removeFromContext strs = do
1025 (as,bs) <- io $ GHC.getContext s
1027 (as_to_remove,bs_to_remove) <- separate s strs [] []
1029 let as' = as \\ (as_to_remove ++ bs_to_remove)
1030 bs' = bs \\ (as_to_remove ++ bs_to_remove)
1032 io $ GHC.setContext s as' bs'
1034 ----------------------------------------------------------------------------
1037 -- set options in the interpreter. Syntax is exactly the same as the
1038 -- ghc command line, except that certain options aren't available (-C,
1041 -- This is pretty fragile: most options won't work as expected. ToDo:
1042 -- figure out which ones & disallow them.
1044 setCmd :: String -> GHCi ()
1046 = do st <- getGHCiState
1047 let opts = options st
1048 io $ putStrLn (showSDoc (
1049 text "options currently set: " <>
1052 else hsep (map (\o -> char '+' <> text (optToStr o)) opts)
1055 = case toArgs str of
1056 ("args":args) -> setArgs args
1057 ("prog":prog) -> setProg prog
1058 ("prompt":prompt) -> setPrompt (after 6)
1059 ("editor":cmd) -> setEditor (after 6)
1060 ("stop":cmd) -> setStop (after 4)
1061 wds -> setOptions wds
1062 where after n = dropWhile isSpace $ drop n $ dropWhile isSpace str
1066 setGHCiState st{ args = args }
1070 setGHCiState st{ progname = prog }
1072 io (hPutStrLn stderr "syntax: :set prog <progname>")
1076 setGHCiState st{ editor = cmd }
1080 setGHCiState st{ stop = cmd }
1082 setPrompt value = do
1085 then io $ hPutStrLn stderr $ "syntax: :set prompt <prompt>, currently \"" ++ prompt st ++ "\""
1086 else setGHCiState st{ prompt = remQuotes value }
1088 remQuotes ('\"':xs) | not (null xs) && last xs == '\"' = init xs
1092 do -- first, deal with the GHCi opts (+s, +t, etc.)
1093 let (plus_opts, minus_opts) = partition isPlus wds
1094 mapM_ setOpt plus_opts
1096 -- then, dynamic flags
1097 dflags <- getDynFlags
1098 let pkg_flags = packageFlags dflags
1099 (dflags',leftovers) <- io $ GHC.parseDynamicFlags dflags minus_opts
1101 if (not (null leftovers))
1102 then throwDyn (CmdLineError ("unrecognised flags: " ++
1106 new_pkgs <- setDynFlags dflags'
1108 -- if the package flags changed, we should reset the context
1109 -- and link the new packages.
1110 dflags <- getDynFlags
1111 when (packageFlags dflags /= pkg_flags) $ do
1112 io $ hPutStrLn stderr "package flags have changed, ressetting and loading new packages..."
1113 session <- getSession
1114 io (GHC.setTargets session [])
1115 io (GHC.load session LoadAllTargets)
1116 io (linkPackages dflags new_pkgs)
1117 setContextAfterLoad session []
1121 unsetOptions :: String -> GHCi ()
1123 = do -- first, deal with the GHCi opts (+s, +t, etc.)
1124 let opts = words str
1125 (minus_opts, rest1) = partition isMinus opts
1126 (plus_opts, rest2) = partition isPlus rest1
1128 if (not (null rest2))
1129 then io (putStrLn ("unknown option: '" ++ head rest2 ++ "'"))
1132 mapM_ unsetOpt plus_opts
1134 -- can't do GHC flags for now
1135 if (not (null minus_opts))
1136 then throwDyn (CmdLineError "can't unset GHC command-line flags")
1139 isMinus ('-':s) = True
1142 isPlus ('+':s) = True
1146 = case strToGHCiOpt str of
1147 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1148 Just o -> setOption o
1151 = case strToGHCiOpt str of
1152 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1153 Just o -> unsetOption o
1155 strToGHCiOpt :: String -> (Maybe GHCiOption)
1156 strToGHCiOpt "s" = Just ShowTiming
1157 strToGHCiOpt "t" = Just ShowType
1158 strToGHCiOpt "r" = Just RevertCAFs
1159 strToGHCiOpt _ = Nothing
1161 optToStr :: GHCiOption -> String
1162 optToStr ShowTiming = "s"
1163 optToStr ShowType = "t"
1164 optToStr RevertCAFs = "r"
1166 -- ---------------------------------------------------------------------------
1172 ["args"] -> io $ putStrLn (show (args st))
1173 ["prog"] -> io $ putStrLn (show (progname st))
1174 ["prompt"] -> io $ putStrLn (show (prompt st))
1175 ["editor"] -> io $ putStrLn (show (editor st))
1176 ["stop"] -> io $ putStrLn (show (stop st))
1177 ["modules" ] -> showModules
1178 ["bindings"] -> showBindings
1179 ["linker"] -> io showLinkerState
1180 ["breaks"] -> showBkptTable
1181 ["context"] -> showContext
1182 _ -> throwDyn (CmdLineError "syntax: :show [args|prog|prompt|editor|stop|modules|bindings|breaks|context]")
1185 session <- getSession
1186 let show_one ms = do m <- io (GHC.showModule session ms)
1188 graph <- io (GHC.getModuleGraph session)
1189 mapM_ show_one graph
1193 unqual <- io (GHC.getPrintUnqual s)
1194 bindings <- io (GHC.getBindings s)
1195 mapM_ showTyThing bindings
1198 showTyThing (AnId id) = do
1199 ty' <- cleanType (GHC.idType id)
1200 printForUser $ ppr id <> text " :: " <> ppr ty'
1201 showTyThing _ = return ()
1203 -- if -fglasgow-exts is on we show the foralls, otherwise we don't.
1204 cleanType :: Type -> GHCi Type
1206 dflags <- getDynFlags
1207 if dopt Opt_GlasgowExts dflags
1209 else return $! GHC.dropForAlls ty
1211 showBkptTable :: GHCi ()
1214 printForUser $ prettyLocations (breaks st)
1216 showContext :: GHCi ()
1218 session <- getSession
1219 resumes <- io $ GHC.getResumeContext session
1220 printForUser $ vcat (map pp_resume (reverse resumes))
1223 ptext SLIT("--> ") <> text (GHC.resumeStmt resume)
1224 $$ nest 2 (ptext SLIT("Stopped at") <+> ppr (GHC.resumeSpan resume))
1227 -- -----------------------------------------------------------------------------
1230 completeNone :: String -> IO [String]
1231 completeNone w = return []
1234 completeWord :: String -> Int -> Int -> IO (Maybe (String, [String]))
1235 completeWord w start end = do
1236 line <- Readline.getLineBuffer
1238 ':':_ | all isSpace (take (start-1) line) -> wrapCompleter completeCmd w
1240 | Just c <- is_cmd line -> do
1241 maybe_cmd <- lookupCommand c
1242 let (n,w') = selectWord (words' 0 line)
1244 Nothing -> return Nothing
1245 Just (_,_,False,complete) -> wrapCompleter complete w
1246 Just (_,_,True,complete) -> let complete' w = do rets <- complete w
1247 return (map (drop n) rets)
1248 in wrapCompleter complete' w'
1250 --printf "complete %s, start = %d, end = %d\n" w start end
1251 wrapCompleter completeIdentifier w
1252 where words' _ [] = []
1253 words' n str = let (w,r) = break isSpace str
1254 (s,r') = span isSpace r
1255 in (n,w):words' (n+length w+length s) r'
1256 -- In a Haskell expression we want to parse 'a-b' as three words
1257 -- where a compiler flag (ie. -fno-monomorphism-restriction) should
1258 -- only be a single word.
1259 selectWord [] = (0,w)
1260 selectWord ((offset,x):xs)
1261 | offset+length x >= start = (start-offset,take (end-offset) x)
1262 | otherwise = selectWord xs
1265 | ((':':w) : _) <- words (dropWhile isSpace line) = Just w
1266 | otherwise = Nothing
1269 cmds <- readIORef commands
1270 return (filter (w `isPrefixOf`) (map (':':) (map cmdName cmds)))
1272 completeMacro w = do
1273 cmds <- readIORef commands
1274 let cmds' = [ cmd | cmd <- map cmdName cmds, cmd `elem` map cmdName builtin_commands ]
1275 return (filter (w `isPrefixOf`) cmds')
1277 completeIdentifier w = do
1279 rdrs <- GHC.getRdrNamesInScope s
1280 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) rdrs))
1282 completeModule w = do
1284 dflags <- GHC.getSessionDynFlags s
1285 let pkg_mods = allExposedModules dflags
1286 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) pkg_mods))
1288 completeHomeModule w = do
1290 g <- GHC.getModuleGraph s
1291 let home_mods = map GHC.ms_mod_name g
1292 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) home_mods))
1294 completeSetOptions w = do
1295 return (filter (w `isPrefixOf`) options)
1296 where options = "args":"prog":allFlags
1298 completeFilename = Readline.filenameCompletionFunction
1300 completeHomeModuleOrFile = unionComplete completeHomeModule completeFilename
1302 unionComplete :: (String -> IO [String]) -> (String -> IO [String]) -> String -> IO [String]
1303 unionComplete f1 f2 w = do
1308 wrapCompleter :: (String -> IO [String]) -> String -> IO (Maybe (String,[String]))
1309 wrapCompleter fun w = do
1312 [] -> return Nothing
1313 [x] -> return (Just (x,[]))
1314 xs -> case getCommonPrefix xs of
1315 "" -> return (Just ("",xs))
1316 pref -> return (Just (pref,xs))
1318 getCommonPrefix :: [String] -> String
1319 getCommonPrefix [] = ""
1320 getCommonPrefix (s:ss) = foldl common s ss
1321 where common s "" = ""
1323 common (c:cs) (d:ds)
1324 | c == d = c : common cs ds
1327 allExposedModules :: DynFlags -> [ModuleName]
1328 allExposedModules dflags
1329 = map GHC.mkModuleName (concat (map exposedModules (filter exposed (eltsUFM pkg_db))))
1331 pkg_db = pkgIdMap (pkgState dflags)
1333 completeCmd = completeNone
1334 completeMacro = completeNone
1335 completeIdentifier = completeNone
1336 completeModule = completeNone
1337 completeHomeModule = completeNone
1338 completeSetOptions = completeNone
1339 completeFilename = completeNone
1340 completeHomeModuleOrFile=completeNone
1341 completeBkpt = completeNone
1344 -- ---------------------------------------------------------------------------
1345 -- User code exception handling
1347 -- This is the exception handler for exceptions generated by the
1348 -- user's code and exceptions coming from children sessions;
1349 -- it normally just prints out the exception. The
1350 -- handler must be recursive, in case showing the exception causes
1351 -- more exceptions to be raised.
1353 -- Bugfix: if the user closed stdout or stderr, the flushing will fail,
1354 -- raising another exception. We therefore don't put the recursive
1355 -- handler arond the flushing operation, so if stderr is closed
1356 -- GHCi will just die gracefully rather than going into an infinite loop.
1357 handler :: Exception -> GHCi Bool
1359 handler exception = do
1361 io installSignalHandlers
1362 ghciHandle handler (showException exception >> return False)
1364 showException (DynException dyn) =
1365 case fromDynamic dyn of
1366 Nothing -> io (putStrLn ("*** Exception: (unknown)"))
1367 Just Interrupted -> io (putStrLn "Interrupted.")
1368 Just (CmdLineError s) -> io (putStrLn s) -- omit the location for CmdLineError
1369 Just ph@PhaseFailed{} -> io (putStrLn (showGhcException ph "")) -- ditto
1370 Just other_ghc_ex -> io (print other_ghc_ex)
1372 showException other_exception
1373 = io (putStrLn ("*** Exception: " ++ show other_exception))
1375 -----------------------------------------------------------------------------
1376 -- recursive exception handlers
1378 -- Don't forget to unblock async exceptions in the handler, or if we're
1379 -- in an exception loop (eg. let a = error a in a) the ^C exception
1380 -- may never be delivered. Thanks to Marcin for pointing out the bug.
1382 ghciHandle :: (Exception -> GHCi a) -> GHCi a -> GHCi a
1383 ghciHandle h (GHCi m) = GHCi $ \s ->
1384 Exception.catch (m s)
1385 (\e -> unGHCi (ghciUnblock (h e)) s)
1387 ghciUnblock :: GHCi a -> GHCi a
1388 ghciUnblock (GHCi a) = GHCi $ \s -> Exception.unblock (a s)
1391 -- ----------------------------------------------------------------------------
1394 expandPath :: String -> GHCi String
1396 case dropWhile isSpace path of
1398 tilde <- io (getEnv "HOME") -- will fail if HOME not defined
1399 return (tilde ++ '/':d)
1403 wantInterpretedModule :: String -> GHCi Module
1404 wantInterpretedModule str = do
1405 session <- getSession
1406 modl <- lookupModule str
1407 is_interpreted <- io (GHC.moduleIsInterpreted session modl)
1408 when (not is_interpreted) $
1409 throwDyn (CmdLineError ("module '" ++ str ++ "' is not interpreted"))
1412 wantNameFromInterpretedModule noCanDo str and_then = do
1413 session <- getSession
1414 names <- io $ GHC.parseName session str
1418 let modl = GHC.nameModule n
1419 is_interpreted <- io (GHC.moduleIsInterpreted session modl)
1420 if not is_interpreted
1421 then noCanDo n $ text "module " <> ppr modl <>
1422 text " is not interpreted"
1425 -- ----------------------------------------------------------------------------
1426 -- Windows console setup
1428 setUpConsole :: IO ()
1430 #ifdef mingw32_HOST_OS
1431 -- On Windows we need to set a known code page, otherwise the characters
1432 -- we read from the console will be be in some strange encoding, and
1433 -- similarly for characters we write to the console.
1435 -- At the moment, GHCi pretends all input is Latin-1. In the
1436 -- future we should support UTF-8, but for now we set the code pages
1439 -- It seems you have to set the font in the console window to
1440 -- a Unicode font in order for output to work properly,
1441 -- otherwise non-ASCII characters are mapped wrongly. sigh.
1442 -- (see MSDN for SetConsoleOutputCP()).
1444 setConsoleCP 28591 -- ISO Latin-1
1445 setConsoleOutputCP 28591 -- ISO Latin-1
1449 -- -----------------------------------------------------------------------------
1450 -- commands for debugger
1452 sprintCmd = pprintCommand False False
1453 printCmd = pprintCommand True False
1454 forceCmd = pprintCommand False True
1456 pprintCommand bind force str = do
1457 session <- getSession
1458 io $ pprintClosureCommand session bind force str
1460 stepCmd :: String -> GHCi Bool
1461 stepCmd [] = doContinue GHC.SingleStep
1462 stepCmd expression = runStmt expression GHC.SingleStep
1464 traceCmd :: String -> GHCi Bool
1465 traceCmd [] = doContinue GHC.RunAndLogSteps
1466 traceCmd expression = runStmt expression GHC.RunAndLogSteps
1468 continueCmd :: String -> GHCi Bool
1469 continueCmd [] = doContinue GHC.RunToCompletion
1470 continueCmd other = do
1471 io $ putStrLn "The continue command accepts no arguments."
1474 doContinue :: SingleStep -> GHCi Bool
1475 doContinue step = do
1476 session <- getSession
1477 runResult <- io $ GHC.resume session step
1478 afterRunStmt runResult
1481 abandonCmd :: String -> GHCi ()
1482 abandonCmd = noArgs $ do
1484 b <- io $ GHC.abandon s -- the prompt will change to indicate the new context
1485 when (not b) $ io $ putStrLn "There is no computation running."
1488 deleteCmd :: String -> GHCi ()
1489 deleteCmd argLine = do
1490 deleteSwitch $ words argLine
1492 deleteSwitch :: [String] -> GHCi ()
1494 io $ putStrLn "The delete command requires at least one argument."
1495 -- delete all break points
1496 deleteSwitch ("*":_rest) = discardActiveBreakPoints
1497 deleteSwitch idents = do
1498 mapM_ deleteOneBreak idents
1500 deleteOneBreak :: String -> GHCi ()
1502 | all isDigit str = deleteBreak (read str)
1503 | otherwise = return ()
1505 historyCmd :: String -> GHCi ()
1507 | null arg = history 20
1508 | all isDigit arg = history (read arg)
1509 | otherwise = io $ putStrLn "Syntax: :history [num]"
1513 resumes <- io $ GHC.getResumeContext s
1515 [] -> io $ putStrLn "Not stopped at a breakpoint"
1517 let hist = GHC.resumeHistory r
1518 (took,rest) = splitAt num hist
1519 spans <- mapM (io . GHC.getHistorySpan s) took
1520 let nums = map (printf "-%-3d:") [(1::Int)..]
1521 printForUser (vcat (zipWith (<+>) (map text nums) (map ppr spans)))
1522 io $ putStrLn $ if null rest then "<end of history>" else "..."
1524 backCmd :: String -> GHCi ()
1525 backCmd = noArgs $ do
1527 (names, ix, span) <- io $ GHC.back s
1528 printForUser $ ptext SLIT("Logged breakpoint at") <+> ppr span
1529 mapM_ (showTypeOfName s) names
1530 -- run the command set with ":set stop <cmd>"
1532 runCommand (stop st)
1535 forwardCmd :: String -> GHCi ()
1536 forwardCmd = noArgs $ do
1538 (names, ix, span) <- io $ GHC.forward s
1539 printForUser $ (if (ix == 0)
1540 then ptext SLIT("Stopped at")
1541 else ptext SLIT("Logged breakpoint at")) <+> ppr span
1542 mapM_ (showTypeOfName s) names
1543 -- run the command set with ":set stop <cmd>"
1545 runCommand (stop st)
1548 -- handle the "break" command
1549 breakCmd :: String -> GHCi ()
1550 breakCmd argLine = do
1551 session <- getSession
1552 breakSwitch session $ words argLine
1554 breakSwitch :: Session -> [String] -> GHCi ()
1555 breakSwitch _session [] = do
1556 io $ putStrLn "The break command requires at least one argument."
1557 breakSwitch session args@(arg1:rest)
1558 | looksLikeModuleName arg1 = do
1559 mod <- wantInterpretedModule arg1
1560 breakByModule session mod rest
1561 | all isDigit arg1 = do
1562 (toplevel, _) <- io $ GHC.getContext session
1564 (mod : _) -> breakByModuleLine mod (read arg1) rest
1566 io $ putStrLn "Cannot find default module for breakpoint."
1567 io $ putStrLn "Perhaps no modules are loaded for debugging?"
1568 | otherwise = do -- try parsing it as an identifier
1569 wantNameFromInterpretedModule noCanDo arg1 $ \name -> do
1570 let loc = GHC.nameSrcLoc name
1571 if GHC.isGoodSrcLoc loc
1572 then findBreakAndSet (GHC.nameModule name) $
1573 findBreakByCoord (Just (GHC.srcLocFile loc))
1574 (GHC.srcLocLine loc,
1576 else noCanDo name $ text "can't find its location: " <> ppr loc
1578 noCanDo n why = printForUser $
1579 text "cannot set breakpoint on " <> ppr n <> text ": " <> why
1581 breakByModule :: Session -> Module -> [String] -> GHCi ()
1582 breakByModule session mod args@(arg1:rest)
1583 | all isDigit arg1 = do -- looks like a line number
1584 breakByModuleLine mod (read arg1) rest
1585 | otherwise = io $ putStrLn "Invalid arguments to :break"
1587 breakByModuleLine :: Module -> Int -> [String] -> GHCi ()
1588 breakByModuleLine mod line args
1589 | [] <- args = findBreakAndSet mod $ findBreakByLine line
1590 | [col] <- args, all isDigit col =
1591 findBreakAndSet mod $ findBreakByCoord Nothing (line, read col)
1592 | otherwise = io $ putStrLn "Invalid arguments to :break"
1594 findBreakAndSet :: Module -> (TickArray -> Maybe (Int, SrcSpan)) -> GHCi ()
1595 findBreakAndSet mod lookupTickTree = do
1596 tickArray <- getTickArray mod
1597 (breakArray, _) <- getModBreak mod
1598 case lookupTickTree tickArray of
1599 Nothing -> io $ putStrLn $ "No breakpoints found at that location."
1600 Just (tick, span) -> do
1601 success <- io $ setBreakFlag True breakArray tick
1602 session <- getSession
1606 recordBreak $ BreakLocation
1612 text "Breakpoint " <> ppr nm <>
1614 then text " was already set at " <> ppr span
1615 else text " activated at " <> ppr span
1617 printForUser $ text "Breakpoint could not be activated at"
1620 -- When a line number is specified, the current policy for choosing
1621 -- the best breakpoint is this:
1622 -- - the leftmost complete subexpression on the specified line, or
1623 -- - the leftmost subexpression starting on the specified line, or
1624 -- - the rightmost subexpression enclosing the specified line
1626 findBreakByLine :: Int -> TickArray -> Maybe (BreakIndex,SrcSpan)
1627 findBreakByLine line arr
1628 | not (inRange (bounds arr) line) = Nothing
1630 listToMaybe (sortBy leftmost_largest complete) `mplus`
1631 listToMaybe (sortBy leftmost_smallest incomplete) `mplus`
1632 listToMaybe (sortBy rightmost ticks)
1636 starts_here = [ tick | tick@(nm,span) <- ticks,
1637 GHC.srcSpanStartLine span == line ]
1639 (complete,incomplete) = partition ends_here starts_here
1640 where ends_here (nm,span) = GHC.srcSpanEndLine span == line
1642 findBreakByCoord :: Maybe FastString -> (Int,Int) -> TickArray
1643 -> Maybe (BreakIndex,SrcSpan)
1644 findBreakByCoord mb_file (line, col) arr
1645 | not (inRange (bounds arr) line) = Nothing
1647 listToMaybe (sortBy rightmost contains)
1651 -- the ticks that span this coordinate
1652 contains = [ tick | tick@(nm,span) <- ticks, span `spans` (line,col),
1653 is_correct_file span ]
1655 is_correct_file span
1656 | Just f <- mb_file = GHC.srcSpanFile span == f
1660 leftmost_smallest (_,a) (_,b) = a `compare` b
1661 leftmost_largest (_,a) (_,b) = (GHC.srcSpanStart a `compare` GHC.srcSpanStart b)
1663 (GHC.srcSpanEnd b `compare` GHC.srcSpanEnd a)
1664 rightmost (_,a) (_,b) = b `compare` a
1666 spans :: SrcSpan -> (Int,Int) -> Bool
1667 spans span (l,c) = GHC.srcSpanStart span <= loc && loc <= GHC.srcSpanEnd span
1668 where loc = GHC.mkSrcLoc (GHC.srcSpanFile span) l c
1670 start_bold = BS.pack "\ESC[1m"
1671 end_bold = BS.pack "\ESC[0m"
1673 listCmd :: String -> GHCi ()
1675 mb_span <- getCurrentBreakSpan
1677 Nothing -> printForUser $ text "not stopped at a breakpoint; nothing to list"
1678 Just span -> io $ listAround span True
1679 listCmd str = list2 (words str)
1681 list2 [arg] | all isDigit arg = do
1682 session <- getSession
1683 (toplevel, _) <- io $ GHC.getContext session
1685 [] -> io $ putStrLn "No module to list"
1686 (mod : _) -> listModuleLine mod (read arg)
1687 list2 [arg1,arg2] | looksLikeModuleName arg1, all isDigit arg2 = do
1688 mod <- wantInterpretedModule arg1
1689 listModuleLine mod (read arg2)
1691 wantNameFromInterpretedModule noCanDo arg $ \name -> do
1692 let loc = GHC.nameSrcLoc name
1693 if GHC.isGoodSrcLoc loc
1695 tickArray <- getTickArray (GHC.nameModule name)
1696 let mb_span = findBreakByCoord (Just (GHC.srcLocFile loc))
1697 (GHC.srcLocLine loc, GHC.srcLocCol loc)
1700 Nothing -> io $ listAround (GHC.srcLocSpan loc) False
1701 Just (_,span) -> io $ listAround span False
1703 noCanDo name $ text "can't find its location: " <>
1706 noCanDo n why = printForUser $
1707 text "cannot list source code for " <> ppr n <> text ": " <> why
1709 io $ putStrLn "syntax: :list [<line> | <module> <line> | <identifier>]"
1711 listModuleLine :: Module -> Int -> GHCi ()
1712 listModuleLine modl line = do
1713 session <- getSession
1714 graph <- io (GHC.getModuleGraph session)
1715 let this = filter ((== modl) . GHC.ms_mod) graph
1717 [] -> panic "listModuleLine"
1719 let filename = fromJust (ml_hs_file (GHC.ms_location summ))
1720 loc = GHC.mkSrcLoc (mkFastString (filename)) line 0
1721 io $ listAround (GHC.srcLocSpan loc) False
1723 -- | list a section of a source file around a particular SrcSpan.
1724 -- If the highlight flag is True, also highlight the span using
1725 -- start_bold/end_bold.
1726 listAround span do_highlight = do
1727 contents <- BS.readFile (unpackFS file)
1729 lines = BS.split '\n' contents
1730 these_lines = take (line2 - line1 + 1 + pad_before + pad_after) $
1731 drop (line1 - 1 - pad_before) $ lines
1732 fst_line = max 1 (line1 - pad_before)
1733 line_nos = [ fst_line .. ]
1735 highlighted | do_highlight = zipWith highlight line_nos these_lines
1736 | otherwise = these_lines
1738 bs_line_nos = [ BS.pack (show l ++ " ") | l <- line_nos ]
1739 prefixed = zipWith BS.append bs_line_nos highlighted
1741 BS.putStrLn (BS.join (BS.pack "\n") prefixed)
1743 file = GHC.srcSpanFile span
1744 line1 = GHC.srcSpanStartLine span
1745 col1 = GHC.srcSpanStartCol span
1746 line2 = GHC.srcSpanEndLine span
1747 col2 = GHC.srcSpanEndCol span
1749 pad_before | line1 == 1 = 0
1754 | no == line1 && no == line2
1755 = let (a,r) = BS.splitAt col1 line
1756 (b,c) = BS.splitAt (col2-col1) r
1758 BS.concat [a,start_bold,b,end_bold,c]
1760 = let (a,b) = BS.splitAt col1 line in
1761 BS.concat [a, start_bold, b]
1763 = let (a,b) = BS.splitAt col2 line in
1764 BS.concat [a, end_bold, b]
1767 -- --------------------------------------------------------------------------
1770 getTickArray :: Module -> GHCi TickArray
1771 getTickArray modl = do
1773 let arrmap = tickarrays st
1774 case lookupModuleEnv arrmap modl of
1775 Just arr -> return arr
1777 (breakArray, ticks) <- getModBreak modl
1778 let arr = mkTickArray (assocs ticks)
1779 setGHCiState st{tickarrays = extendModuleEnv arrmap modl arr}
1782 discardTickArrays :: GHCi ()
1783 discardTickArrays = do
1785 setGHCiState st{tickarrays = emptyModuleEnv}
1787 mkTickArray :: [(BreakIndex,SrcSpan)] -> TickArray
1789 = accumArray (flip (:)) [] (1, max_line)
1790 [ (line, (nm,span)) | (nm,span) <- ticks,
1791 line <- srcSpanLines span ]
1793 max_line = maximum (map GHC.srcSpanEndLine (map snd ticks))
1794 srcSpanLines span = [ GHC.srcSpanStartLine span ..
1795 GHC.srcSpanEndLine span ]
1797 lookupModule :: String -> GHCi Module
1798 lookupModule modName
1799 = do session <- getSession
1800 io (GHC.findModule session (GHC.mkModuleName modName) Nothing)
1802 -- don't reset the counter back to zero?
1803 discardActiveBreakPoints :: GHCi ()
1804 discardActiveBreakPoints = do
1806 mapM (turnOffBreak.snd) (breaks st)
1807 setGHCiState $ st { breaks = [] }
1809 deleteBreak :: Int -> GHCi ()
1810 deleteBreak identity = do
1812 let oldLocations = breaks st
1813 (this,rest) = partition (\loc -> fst loc == identity) oldLocations
1815 then printForUser (text "Breakpoint" <+> ppr identity <+>
1816 text "does not exist")
1818 mapM (turnOffBreak.snd) this
1819 setGHCiState $ st { breaks = rest }
1821 turnOffBreak loc = do
1822 (arr, _) <- getModBreak (breakModule loc)
1823 io $ setBreakFlag False arr (breakTick loc)
1825 getModBreak :: Module -> GHCi (GHC.BreakArray, Array Int SrcSpan)
1826 getModBreak mod = do
1827 session <- getSession
1828 Just mod_info <- io $ GHC.getModuleInfo session mod
1829 let modBreaks = GHC.modInfoModBreaks mod_info
1830 let array = GHC.modBreaks_flags modBreaks
1831 let ticks = GHC.modBreaks_locs modBreaks
1832 return (array, ticks)
1834 setBreakFlag :: Bool -> GHC.BreakArray -> Int -> IO Bool
1835 setBreakFlag toggle array index
1836 | toggle = GHC.setBreakOn array index
1837 | otherwise = GHC.setBreakOff array index