1 {-# OPTIONS -fno-cse #-}
2 -- -fno-cse is needed for GLOBAL_VAR's to behave properly
4 {-# OPTIONS -#include "Linker.h" #-}
5 -----------------------------------------------------------------------------
7 -- GHC Interactive User Interface
9 -- (c) The GHC Team 2005-2006
11 -----------------------------------------------------------------------------
13 module InteractiveUI ( interactiveUI, ghciWelcomeMsg ) where
15 #include "HsVersions.h"
17 import qualified GhciMonad
18 import GhciMonad hiding (runStmt)
23 import qualified GHC hiding (resume, runStmt)
24 import GHC ( LoadHowMuch(..), Target(..), TargetId(..),
25 Module, ModuleName, TyThing(..), Phase,
26 BreakIndex, SrcSpan, Resume, SingleStep,
27 Ghc, handleSourceError )
37 import HscTypes ( implicitTyThings, reflectGhc, reifyGhc )
38 import qualified RdrName ( getGRE_NameQualifier_maybes ) -- should this come via GHC?
39 import Outputable hiding (printForUser, printForUserPartWay)
40 import Module -- for ModuleEnv
44 -- Other random utilities
48 import BasicTypes hiding (isTopLevel)
49 import Panic hiding (showException)
55 import Maybes ( orElse )
58 import MonadUtils ( liftIO )
60 #ifndef mingw32_HOST_OS
61 import System.Posix hiding (getEnv)
63 import GHC.ConsoleHandler ( flushConsole )
64 import qualified System.Win32
68 import Control.Concurrent ( yield ) -- Used in readline loop
69 import System.Console.Editline.Readline as Readline
75 -- import Control.Concurrent
77 import System.FilePath
78 import qualified Data.ByteString.Char8 as BS
82 import System.Environment
83 import System.Exit ( exitWith, ExitCode(..) )
84 import System.Directory
86 import System.IO.Error as IO
90 import Control.Monad as Monad
94 import GHC.Exts ( unsafeCoerce# )
95 import GHC.IOBase ( IOErrorType(InvalidArgument) )
98 import Data.IORef ( IORef, readIORef, writeIORef )
101 import System.Posix.Internals ( setNonBlockingFD )
104 -----------------------------------------------------------------------------
106 ghciWelcomeMsg :: String
107 ghciWelcomeMsg = "GHCi, version " ++ cProjectVersion ++
108 ": http://www.haskell.org/ghc/ :? for help"
110 cmdName :: Command -> String
111 cmdName (n,_,_,_) = n
113 GLOBAL_VAR(macros_ref, [], [Command])
115 builtin_commands :: [Command]
117 -- Hugs users are accustomed to :e, so make sure it doesn't overlap
118 ("?", keepGoing help, Nothing, completeNone),
119 ("add", keepGoingPaths addModule, Just filenameWordBreakChars, completeFilename),
120 ("abandon", keepGoing abandonCmd, Nothing, completeNone),
121 ("break", keepGoing breakCmd, Nothing, completeIdentifier),
122 ("back", keepGoing backCmd, Nothing, completeNone),
123 ("browse", keepGoing (browseCmd False), Nothing, completeModule),
124 ("browse!", keepGoing (browseCmd True), Nothing, completeModule),
125 ("cd", keepGoing changeDirectory, Just filenameWordBreakChars, completeFilename),
126 ("check", keepGoing checkModule, Nothing, completeHomeModule),
127 ("continue", keepGoing continueCmd, Nothing, completeNone),
128 ("cmd", keepGoing cmdCmd, Nothing, completeIdentifier),
129 ("ctags", keepGoing createCTagsFileCmd, Just filenameWordBreakChars, completeFilename),
130 ("def", keepGoing (defineMacro False), Nothing, completeIdentifier),
131 ("def!", keepGoing (defineMacro True), Nothing, completeIdentifier),
132 ("delete", keepGoing deleteCmd, Nothing, completeNone),
133 ("e", keepGoing editFile, Just filenameWordBreakChars, completeFilename),
134 ("edit", keepGoing editFile, Just filenameWordBreakChars, completeFilename),
135 ("etags", keepGoing createETagsFileCmd, Just filenameWordBreakChars, completeFilename),
136 ("force", keepGoing forceCmd, Nothing, completeIdentifier),
137 ("forward", keepGoing forwardCmd, Nothing, completeNone),
138 ("help", keepGoing help, Nothing, completeNone),
139 ("history", keepGoing historyCmd, Nothing, completeNone),
140 ("info", keepGoing info, Nothing, completeIdentifier),
141 ("kind", keepGoing kindOfType, Nothing, completeIdentifier),
142 ("load", keepGoingPaths loadModule_, Just filenameWordBreakChars, completeHomeModuleOrFile),
143 ("list", keepGoing listCmd, Nothing, completeNone),
144 ("module", keepGoing setContext, Nothing, completeModule),
145 ("main", keepGoing runMain, Nothing, completeIdentifier),
146 ("print", keepGoing printCmd, Nothing, completeIdentifier),
147 ("quit", quit, Nothing, completeNone),
148 ("reload", keepGoing reloadModule, Nothing, completeNone),
149 ("run", keepGoing runRun, Nothing, completeIdentifier),
150 ("set", keepGoing setCmd, Just flagWordBreakChars, completeSetOptions),
151 ("show", keepGoing showCmd, Nothing, completeNone),
152 ("sprint", keepGoing sprintCmd, Nothing, completeIdentifier),
153 ("step", keepGoing stepCmd, Nothing, completeIdentifier),
154 ("steplocal", keepGoing stepLocalCmd, Nothing, completeIdentifier),
155 ("stepmodule",keepGoing stepModuleCmd, Nothing, completeIdentifier),
156 ("type", keepGoing typeOfExpr, Nothing, completeIdentifier),
157 ("trace", keepGoing traceCmd, Nothing, completeIdentifier),
158 ("undef", keepGoing undefineMacro, Nothing, completeMacro),
159 ("unset", keepGoing unsetOptions, Just flagWordBreakChars, completeSetOptions)
163 -- We initialize readline (in the interactiveUI function) to use
164 -- word_break_chars as the default set of completion word break characters.
165 -- This can be overridden for a particular command (for example, filename
166 -- expansion shouldn't consider '/' to be a word break) by setting the third
167 -- entry in the Command tuple above.
169 -- NOTE: in order for us to override the default correctly, any custom entry
170 -- must be a SUBSET of word_break_chars.
172 word_break_chars :: String
173 word_break_chars = let symbols = "!#$%&*+/<=>?@\\^|-~"
174 specials = "(),;[]`{}"
176 in spaces ++ specials ++ symbols
179 flagWordBreakChars, filenameWordBreakChars :: String
180 flagWordBreakChars = " \t\n"
181 filenameWordBreakChars = " \t\n\\`@$><=;|&{(" -- bash defaults
184 keepGoing :: (String -> GHCi ()) -> (String -> GHCi Bool)
185 keepGoing a str = a str >> return False
187 keepGoingPaths :: ([FilePath] -> GHCi ()) -> (String -> GHCi Bool)
189 = do case toArgs str of
190 Left err -> io (hPutStrLn stderr err)
194 shortHelpText :: String
195 shortHelpText = "use :? for help.\n"
199 " Commands available from the prompt:\n" ++
201 " <statement> evaluate/run <statement>\n" ++
202 " : repeat last command\n" ++
203 " :{\\n ..lines.. \\n:}\\n multiline command\n" ++
204 " :add [*]<module> ... add module(s) to the current target set\n" ++
205 " :browse[!] [[*]<mod>] display the names defined by module <mod>\n" ++
206 " (!: more details; *: all top-level names)\n" ++
207 " :cd <dir> change directory to <dir>\n" ++
208 " :cmd <expr> run the commands returned by <expr>::IO String\n" ++
209 " :ctags [<file>] create tags file for Vi (default: \"tags\")\n" ++
210 " :def <cmd> <expr> define a command :<cmd>\n" ++
211 " :edit <file> edit file\n" ++
212 " :edit edit last module\n" ++
213 " :etags [<file>] create tags file for Emacs (default: \"TAGS\")\n" ++
214 " :help, :? display this list of commands\n" ++
215 " :info [<name> ...] display information about the given names\n" ++
216 " :kind <type> show the kind of <type>\n" ++
217 " :load [*]<module> ... load module(s) and their dependents\n" ++
218 " :main [<arguments> ...] run the main function with the given arguments\n" ++
219 " :module [+/-] [*]<mod> ... set the context for expression evaluation\n" ++
220 " :quit exit GHCi\n" ++
221 " :reload reload the current module set\n" ++
222 " :run function [<arguments> ...] run the function with the given arguments\n" ++
223 " :type <expr> show the type of <expr>\n" ++
224 " :undef <cmd> undefine user-defined command :<cmd>\n" ++
225 " :!<command> run the shell command <command>\n" ++
227 " -- Commands for debugging:\n" ++
229 " :abandon at a breakpoint, abandon current computation\n" ++
230 " :back go back in the history (after :trace)\n" ++
231 " :break [<mod>] <l> [<col>] set a breakpoint at the specified location\n" ++
232 " :break <name> set a breakpoint on the specified function\n" ++
233 " :continue resume after a breakpoint\n" ++
234 " :delete <number> delete the specified breakpoint\n" ++
235 " :delete * delete all breakpoints\n" ++
236 " :force <expr> print <expr>, forcing unevaluated parts\n" ++
237 " :forward go forward in the history (after :back)\n" ++
238 " :history [<n>] after :trace, show the execution history\n" ++
239 " :list show the source code around current breakpoint\n" ++
240 " :list identifier show the source code for <identifier>\n" ++
241 " :list [<module>] <line> show the source code around line number <line>\n" ++
242 " :print [<name> ...] prints a value without forcing its computation\n" ++
243 " :sprint [<name> ...] simplifed version of :print\n" ++
244 " :step single-step after stopping at a breakpoint\n"++
245 " :step <expr> single-step into <expr>\n"++
246 " :steplocal single-step within the current top-level binding\n"++
247 " :stepmodule single-step restricted to the current module\n"++
248 " :trace trace after stopping at a breakpoint\n"++
249 " :trace <expr> evaluate <expr> with tracing on (see :history)\n"++
252 " -- Commands for changing settings:\n" ++
254 " :set <option> ... set options\n" ++
255 " :set args <arg> ... set the arguments returned by System.getArgs\n" ++
256 " :set prog <progname> set the value returned by System.getProgName\n" ++
257 " :set prompt <prompt> set the prompt used in GHCi\n" ++
258 " :set editor <cmd> set the command used for :edit\n" ++
259 " :set stop <cmd> set the command to run when a breakpoint is hit\n" ++
260 " :unset <option> ... unset options\n" ++
262 " Options for ':set' and ':unset':\n" ++
264 " +r revert top-level expressions after each evaluation\n" ++
265 " +s print timing/memory stats after each evaluation\n" ++
266 " +t print type after evaluation\n" ++
267 " -<flags> most GHC command line flags can also be set here\n" ++
268 " (eg. -v2, -fglasgow-exts, etc.)\n" ++
269 " for GHCi-specific flags, see User's Guide,\n"++
270 " Flag reference, Interactive-mode options\n" ++
272 " -- Commands for displaying information:\n" ++
274 " :show bindings show the current bindings made at the prompt\n" ++
275 " :show breaks show the active breakpoints\n" ++
276 " :show context show the breakpoint context\n" ++
277 " :show modules show the currently loaded modules\n" ++
278 " :show packages show the currently active package flags\n" ++
279 " :show languages show the currently active language flags\n" ++
280 " :show <setting> show value of <setting>, which is one of\n" ++
281 " [args, prog, prompt, editor, stop]\n" ++
284 findEditor :: IO String
289 win <- System.Win32.getWindowsDirectory
290 return (win </> "notepad.exe")
295 interactiveUI :: [(FilePath, Maybe Phase)] -> Maybe [String]
297 interactiveUI srcs maybe_exprs = do
298 -- HACK! If we happen to get into an infinite loop (eg the user
299 -- types 'let x=x in x' at the prompt), then the thread will block
300 -- on a blackhole, and become unreachable during GC. The GC will
301 -- detect that it is unreachable and send it the NonTermination
302 -- exception. However, since the thread is unreachable, everything
303 -- it refers to might be finalized, including the standard Handles.
304 -- This sounds like a bug, but we don't have a good solution right
306 liftIO $ newStablePtr stdin
307 liftIO $ newStablePtr stdout
308 liftIO $ newStablePtr stderr
310 -- Initialise buffering for the *interpreted* I/O system
313 liftIO $ when (isNothing maybe_exprs) $ do
314 -- Only for GHCi (not runghc and ghc -e):
316 -- Turn buffering off for the compiled program's stdout/stderr
318 -- Turn buffering off for GHCi's stdout
320 hSetBuffering stdout NoBuffering
321 -- We don't want the cmd line to buffer any input that might be
322 -- intended for the program, so unbuffer stdin.
323 hSetBuffering stdin NoBuffering
326 is_tty <- hIsTerminalDevice stdin
327 when is_tty $ withReadline $ do
331 (\dir -> Readline.readHistory (dir </> "ghci_history"))
334 Readline.setAttemptedCompletionFunction (Just completeWord)
335 --Readline.parseAndBind "set show-all-if-ambiguous 1"
337 Readline.setBasicWordBreakCharacters word_break_chars
338 Readline.setCompleterWordBreakCharacters word_break_chars
339 Readline.setCompletionAppendCharacter Nothing
342 -- initial context is just the Prelude
343 prel_mod <- GHC.findModule (GHC.mkModuleName "Prelude") Nothing
344 GHC.setContext [] [prel_mod]
346 default_editor <- liftIO $ findEditor
348 cwd <- liftIO $ getCurrentDirectory
350 startGHCi (runGHCi srcs maybe_exprs)
351 GHCiState{ progname = "<interactive>",
355 editor = default_editor,
356 -- session = session,
361 tickarrays = emptyModuleEnv,
362 last_command = Nothing,
366 ghc_e = isJust maybe_exprs
371 Readline.stifleHistory 100
372 withGhcAppData (\dir -> Readline.writeHistory (dir </> "ghci_history"))
374 Readline.resetTerminal Nothing
379 withGhcAppData :: (FilePath -> IO a) -> IO a -> IO a
380 withGhcAppData right left = do
381 either_dir <- IO.try (getAppUserDataDirectory "ghc")
383 Right dir -> right dir
387 runGHCi :: [(FilePath, Maybe Phase)] -> Maybe [String] -> GHCi ()
388 runGHCi paths maybe_exprs = do
390 read_dot_files = not opt_IgnoreDotGhci
392 current_dir = return (Just ".ghci")
394 app_user_dir = io $ withGhcAppData
395 (\dir -> return (Just (dir </> "ghci.conf")))
399 either_dir <- io $ IO.try (getEnv "HOME")
401 Right home -> return (Just (home </> ".ghci"))
404 sourceConfigFile :: FilePath -> GHCi ()
405 sourceConfigFile file = do
406 exists <- io $ doesFileExist file
408 dir_ok <- io $ checkPerms (getDirectory file)
409 file_ok <- io $ checkPerms file
410 when (dir_ok && file_ok) $ do
411 either_hdl <- io $ IO.try (openFile file ReadMode)
414 Right hdl -> runCommands (fileLoop hdl False False)
416 getDirectory f = case takeDirectory f of "" -> "."; d -> d
418 when (read_dot_files) $ do
419 cfgs0 <- sequence [ current_dir, app_user_dir, home_dir ]
420 cfgs <- io $ mapM canonicalizePath (catMaybes cfgs0)
421 mapM_ sourceConfigFile (nub cfgs)
422 -- nub, because we don't want to read .ghci twice if the
425 -- Perform a :load for files given on the GHCi command line
426 -- When in -e mode, if the load fails then we want to stop
427 -- immediately rather than going on to evaluate the expression.
428 when (not (null paths)) $ do
429 ok <- ghciHandle (\e -> do showException e; return Failed) $
431 when (isJust maybe_exprs && failed ok) $
432 io (exitWith (ExitFailure 1))
434 -- if verbosity is greater than 0, or we are connected to a
435 -- terminal, display the prompt in the interactive loop.
436 is_tty <- io (hIsTerminalDevice stdin)
437 dflags <- getDynFlags
438 let show_prompt = verbosity dflags > 0 || is_tty
443 #if defined(mingw32_HOST_OS)
444 -- The win32 Console API mutates the first character of
445 -- type-ahead when reading from it in a non-buffered manner. Work
446 -- around this by flushing the input buffer of type-ahead characters,
447 -- but only if stdin is available.
448 flushed <- io (IO.try (GHC.ConsoleHandler.flushConsole stdin))
450 Left err | isDoesNotExistError err -> return ()
451 | otherwise -> io (ioError err)
452 Right () -> return ()
454 -- enter the interactive loop
455 interactiveLoop is_tty show_prompt
457 -- just evaluate the expression we were given
458 enqueueCommands exprs
459 let handle e = do st <- getGHCiState
460 -- Jump through some hoops to get the
461 -- current progname in the exception text:
462 -- <progname>: <exception>
463 io $ withProgName (progname st)
464 -- this used to be topHandlerFastExit, see #2228
466 runCommands' handle (return Nothing)
469 io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
471 interactiveLoop :: Bool -> Bool -> GHCi ()
472 interactiveLoop is_tty show_prompt =
473 -- Ignore ^C exceptions caught here
474 ghciHandleGhcException (\e -> case e of
476 #if defined(mingw32_HOST_OS)
479 interactiveLoop is_tty show_prompt
480 _other -> return ()) $
482 ghciUnblock $ do -- unblock necessary if we recursed from the
483 -- exception handler above.
485 -- read commands from stdin
488 then runCommands readlineLoop
489 else runCommands (fileLoop stdin show_prompt is_tty)
491 runCommands (fileLoop stdin show_prompt is_tty)
495 -- NOTE: We only read .ghci files if they are owned by the current user,
496 -- and aren't world writable. Otherwise, we could be accidentally
497 -- running code planted by a malicious third party.
499 -- Furthermore, We only read ./.ghci if . is owned by the current user
500 -- and isn't writable by anyone else. I think this is sufficient: we
501 -- don't need to check .. and ../.. etc. because "." always refers to
502 -- the same directory while a process is running.
504 checkPerms :: String -> IO Bool
505 #ifdef mingw32_HOST_OS
510 handleIO (\_ -> return False) $ do
511 st <- getFileStatus name
513 if fileOwner st /= me then do
514 putStrLn $ "WARNING: " ++ name ++ " is owned by someone else, IGNORING!"
517 let mode = fileMode st
518 if (groupWriteMode == (mode `intersectFileModes` groupWriteMode))
519 || (otherWriteMode == (mode `intersectFileModes` otherWriteMode))
521 putStrLn $ "*** WARNING: " ++ name ++
522 " is writable by someone else, IGNORING!"
527 fileLoop :: Handle -> Bool -> Bool -> GHCi (Maybe String)
528 fileLoop hdl show_prompt is_tty = do
529 when show_prompt $ do
532 l <- io (IO.try (hGetLine hdl))
534 Left e | isEOFError e -> return Nothing
535 | InvalidArgument <- etype -> return Nothing
536 | otherwise -> io (ioError e)
537 where etype = ioeGetErrorType e
538 -- treat InvalidArgument in the same way as EOF:
539 -- this can happen if the user closed stdin, or
540 -- perhaps did getContents which closes stdin at
543 str <- io $ consoleInputToUnicode is_tty l
546 #ifdef mingw32_HOST_OS
547 -- Convert the console input into Unicode according to the current code page.
548 -- The Windows console stores Unicode characters directly, so this is a
549 -- rather roundabout way of doing things... oh well.
550 -- See #782, #1483, #1649
551 consoleInputToUnicode :: Bool -> String -> IO String
552 consoleInputToUnicode is_tty str
554 cp <- System.Win32.getConsoleCP
555 System.Win32.stringToUnicode cp str
557 decodeStringAsUTF8 str
559 -- for Unix, assume the input is in UTF-8 and decode it to a Unicode String.
561 consoleInputToUnicode :: Bool -> String -> IO String
562 consoleInputToUnicode _is_tty str = decodeStringAsUTF8 str
565 decodeStringAsUTF8 :: String -> IO String
566 decodeStringAsUTF8 str =
567 withCStringLen str $ \(cstr,len) ->
568 utf8DecodeString (castPtr cstr :: Ptr Word8) len
570 mkPrompt :: GHCi String
572 (toplevs,exports) <- GHC.getContext
573 resumes <- GHC.getResumeContext
574 -- st <- getGHCiState
580 let ix = GHC.resumeHistoryIx r
582 then return (brackets (ppr (GHC.resumeSpan r)) <> space)
584 let hist = GHC.resumeHistory r !! (ix-1)
585 span <- GHC.getHistorySpan hist
586 return (brackets (ppr (negate ix) <> char ':'
587 <+> ppr span) <> space)
589 dots | _:rs <- resumes, not (null rs) = text "... "
596 -- let (btoplevs, bexports) = fromMaybe ([],[]) (remembered_ctx st) in
597 -- hsep (map (\m -> text "!*" <> ppr (GHC.moduleName m)) btoplevs) <+>
598 -- hsep (map (\m -> char '!' <> ppr (GHC.moduleName m)) bexports) <+>
599 hsep (map (\m -> char '*' <> ppr (GHC.moduleName m)) toplevs) <+>
600 hsep (map (ppr . GHC.moduleName) exports)
602 deflt_prompt = dots <> context_bit <> modules_bit
604 f ('%':'s':xs) = deflt_prompt <> f xs
605 f ('%':'%':xs) = char '%' <> f xs
606 f (x:xs) = char x <> f xs
610 return (showSDoc (f (prompt st)))
614 readlineLoop :: GHCi (Maybe String)
617 saveSession -- for use by completion
619 l <- io $ withReadline (readline prompt)
622 Nothing -> return Nothing
623 Just "" -> return (Just "") -- Don't put empty lines in the history
626 str <- io $ consoleInputToUnicode True l
629 withReadline :: IO a -> IO a
630 withReadline = bracket_ stopTimer (do startTimer; setNonBlockingFD 0)
631 -- Two problems are being worked around here:
632 -- 1. readline sometimes puts stdin into blocking mode,
633 -- so we need to put it back for the IO library
634 -- 2. editline doesn't handle some of its system calls returning
635 -- EINTR, so our timer signal confuses it, hence we turn off
636 -- the timer signal when making calls to editline. (#2277)
637 -- If editline is ever fixed, we can remove this.
639 -- These come from the RTS
640 foreign import ccall unsafe startTimer :: IO ()
641 foreign import ccall unsafe stopTimer :: IO ()
644 queryQueue :: GHCi (Maybe String)
649 c:cs -> do setGHCiState st{ cmdqueue = cs }
652 runCommands :: GHCi (Maybe String) -> GHCi ()
653 runCommands = runCommands' handler
655 runCommands' :: (SomeException -> GHCi Bool) -- Exception handler
656 -> GHCi (Maybe String) -> GHCi ()
657 runCommands' eh getCmd = do
658 mb_cmd <- noSpace queryQueue
659 mb_cmd <- maybe (noSpace getCmd) (return . Just) mb_cmd
664 handleSourceError printErrorAndKeepGoing
666 if b then return () else runCommands' eh getCmd
668 printErrorAndKeepGoing err = do
669 GHC.printExceptionAndWarnings err
672 noSpace q = q >>= maybe (return Nothing)
673 (\c->case removeSpaces c of
675 ":{" -> multiLineCmd q
676 c -> return (Just c) )
680 setGHCiState st{ prompt = "%s| " }
681 mb_cmd <- collectCommand q ""
682 getGHCiState >>= \st->setGHCiState st{ prompt = p }
684 -- we can't use removeSpaces for the sublines here, so
685 -- multiline commands are somewhat more brittle against
686 -- fileformat errors (such as \r in dos input on unix),
687 -- we get rid of any extra spaces for the ":}" test;
688 -- we also avoid silent failure if ":}" is not found;
689 -- and since there is no (?) valid occurrence of \r (as
690 -- opposed to its String representation, "\r") inside a
691 -- ghci command, we replace any such with ' ' (argh:-(
692 collectCommand q c = q >>=
693 maybe (io (ioError collectError))
694 (\l->if removeSpaces l == ":}"
695 then return (Just $ removeSpaces c)
696 else collectCommand q (c++map normSpace l))
697 where normSpace '\r' = ' '
699 -- QUESTION: is userError the one to use here?
700 collectError = userError "unterminated multiline command :{ .. :}"
701 doCommand (':' : cmd) = specialCommand cmd
702 doCommand stmt = do timeIt $ runStmt stmt GHC.RunToCompletion
705 enqueueCommands :: [String] -> GHCi ()
706 enqueueCommands cmds = do
708 setGHCiState st{ cmdqueue = cmds ++ cmdqueue st }
711 runStmt :: String -> SingleStep -> GHCi Bool
713 | null (filter (not.isSpace) stmt) = return False
714 | ["import", mod] <- words stmt = keepGoing setContext ('+':mod)
716 = do result <- GhciMonad.runStmt stmt step
717 afterRunStmt (const True) result
719 --afterRunStmt :: GHC.RunResult -> GHCi Bool
720 -- False <=> the statement failed to compile
721 afterRunStmt :: (SrcSpan -> Bool) -> GHC.RunResult -> GHCi Bool
722 afterRunStmt _ (GHC.RunException e) = throw e
723 afterRunStmt step_here run_result = do
724 resumes <- GHC.getResumeContext
726 GHC.RunOk names -> do
727 show_types <- isOptionSet ShowType
728 when show_types $ printTypeOfNames names
729 GHC.RunBreak _ names mb_info
730 | isNothing mb_info ||
731 step_here (GHC.resumeSpan $ head resumes) -> do
732 printForUser $ ptext (sLit "Stopped at") <+>
733 ppr (GHC.resumeSpan $ head resumes)
734 -- printTypeOfNames session names
735 let namesSorted = sortBy compareNames names
736 tythings <- catMaybes `liftM`
737 mapM GHC.lookupName namesSorted
738 docs <- pprTypeAndContents [id | AnId id <- tythings]
739 printForUserPartWay docs
740 maybe (return ()) runBreakCmd mb_info
741 -- run the command set with ":set stop <cmd>"
743 enqueueCommands [stop st]
745 | otherwise -> resume GHC.SingleStep >>=
746 afterRunStmt step_here >> return ()
750 io installSignalHandlers
751 b <- isOptionSet RevertCAFs
754 return (case run_result of GHC.RunOk _ -> True; _ -> False)
756 runBreakCmd :: GHC.BreakInfo -> GHCi ()
757 runBreakCmd info = do
758 let mod = GHC.breakInfo_module info
759 nm = GHC.breakInfo_number info
761 case [ loc | (_,loc) <- breaks st,
762 breakModule loc == mod, breakTick loc == nm ] of
764 loc:_ | null cmd -> return ()
765 | otherwise -> do enqueueCommands [cmd]; return ()
766 where cmd = onBreakCmd loc
768 printTypeOfNames :: [Name] -> GHCi ()
769 printTypeOfNames names
770 = mapM_ (printTypeOfName ) $ sortBy compareNames names
772 compareNames :: Name -> Name -> Ordering
773 n1 `compareNames` n2 = compareWith n1 `compare` compareWith n2
774 where compareWith n = (getOccString n, getSrcSpan n)
776 printTypeOfName :: Name -> GHCi ()
778 = do maybe_tything <- GHC.lookupName n
779 case maybe_tything of
781 Just thing -> printTyThing thing
784 data MaybeCommand = GotCommand Command | BadCommand | NoLastCommand
786 specialCommand :: String -> GHCi Bool
787 specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
788 specialCommand str = do
789 let (cmd,rest) = break isSpace str
790 maybe_cmd <- lookupCommand cmd
792 GotCommand (_,f,_,_) -> f (dropWhile isSpace rest)
794 do io $ hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n"
798 do io $ hPutStr stdout ("there is no last command to perform\n"
802 lookupCommand :: String -> GHCi (MaybeCommand)
803 lookupCommand "" = do
805 case last_command st of
806 Just c -> return $ GotCommand c
807 Nothing -> return NoLastCommand
808 lookupCommand str = do
809 mc <- io $ lookupCommand' str
811 setGHCiState st{ last_command = mc }
813 Just c -> GotCommand c
814 Nothing -> BadCommand
816 lookupCommand' :: String -> IO (Maybe Command)
817 lookupCommand' str = do
818 macros <- readIORef macros_ref
819 let cmds = builtin_commands ++ macros
820 -- look for exact match first, then the first prefix match
821 return $ case [ c | c <- cmds, str == cmdName c ] of
823 [] -> case [ c | c@(s,_,_,_) <- cmds, str `isPrefixOf` s ] of
827 getCurrentBreakSpan :: GHCi (Maybe SrcSpan)
828 getCurrentBreakSpan = do
829 resumes <- GHC.getResumeContext
833 let ix = GHC.resumeHistoryIx r
835 then return (Just (GHC.resumeSpan r))
837 let hist = GHC.resumeHistory r !! (ix-1)
838 span <- GHC.getHistorySpan hist
841 getCurrentBreakModule :: GHCi (Maybe Module)
842 getCurrentBreakModule = do
843 resumes <- GHC.getResumeContext
847 let ix = GHC.resumeHistoryIx r
849 then return (GHC.breakInfo_module `liftM` GHC.resumeBreakInfo r)
851 let hist = GHC.resumeHistory r !! (ix-1)
852 return $ Just $ GHC.getHistoryModule hist
854 -----------------------------------------------------------------------------
857 noArgs :: GHCi () -> String -> GHCi ()
859 noArgs _ _ = io $ putStrLn "This command takes no arguments"
861 help :: String -> GHCi ()
862 help _ = io (putStr helpText)
864 info :: String -> GHCi ()
865 info "" = ghcError (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
866 info s = handleSourceError GHC.printExceptionAndWarnings $ do
867 { let names = words s
868 ; dflags <- getDynFlags
869 ; let pefas = dopt Opt_PrintExplicitForalls dflags
870 ; mapM_ (infoThing pefas) names }
872 infoThing pefas str = do
873 names <- GHC.parseName str
874 mb_stuffs <- mapM GHC.getInfo names
875 let filtered = filterOutChildren (\(t,_f,_i) -> t) (catMaybes mb_stuffs)
876 unqual <- GHC.getPrintUnqual
878 putStrLn (showSDocForUser unqual $
879 vcat (intersperse (text "") $
880 map (pprInfo pefas) filtered))
882 -- Filter out names whose parent is also there Good
883 -- example is '[]', which is both a type and data
884 -- constructor in the same type
885 filterOutChildren :: (a -> TyThing) -> [a] -> [a]
886 filterOutChildren get_thing xs
887 = [x | x <- xs, not (getName (get_thing x) `elemNameSet` implicits)]
889 implicits = mkNameSet [getName t | x <- xs, t <- implicitTyThings (get_thing x)]
891 pprInfo :: PrintExplicitForalls -> (TyThing, Fixity, [GHC.Instance]) -> SDoc
892 pprInfo pefas (thing, fixity, insts)
893 = pprTyThingInContextLoc pefas thing
894 $$ show_fixity fixity
895 $$ vcat (map GHC.pprInstance insts)
898 | fix == GHC.defaultFixity = empty
899 | otherwise = ppr fix <+> ppr (GHC.getName thing)
901 runMain :: String -> GHCi ()
902 runMain s = case toArgs s of
903 Left err -> io (hPutStrLn stderr err)
905 do dflags <- getDynFlags
906 case mainFunIs dflags of
907 Nothing -> doWithArgs args "main"
908 Just f -> doWithArgs args f
910 runRun :: String -> GHCi ()
911 runRun s = case toCmdArgs s of
912 Left err -> io (hPutStrLn stderr err)
913 Right (cmd, args) -> doWithArgs args cmd
915 doWithArgs :: [String] -> String -> GHCi ()
916 doWithArgs args cmd = enqueueCommands ["System.Environment.withArgs " ++
917 show args ++ " (" ++ cmd ++ ")"]
919 addModule :: [FilePath] -> GHCi ()
921 revertCAFs -- always revert CAFs on load/add.
922 files <- mapM expandPath files
923 targets <- mapM (\m -> GHC.guessTarget m Nothing) files
924 -- remove old targets with the same id; e.g. for :add *M
925 mapM_ GHC.removeTarget [ tid | Target tid _ _ <- targets ]
926 mapM_ GHC.addTarget targets
927 prev_context <- GHC.getContext
928 ok <- trySuccess $ GHC.load LoadAllTargets
929 afterLoad ok False prev_context
931 changeDirectory :: String -> GHCi ()
932 changeDirectory "" = do
933 -- :cd on its own changes to the user's home directory
934 either_dir <- io (IO.try getHomeDirectory)
937 Right dir -> changeDirectory dir
938 changeDirectory dir = do
939 graph <- GHC.getModuleGraph
940 when (not (null graph)) $
941 io $ putStr "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed.\n"
942 prev_context <- GHC.getContext
944 GHC.load LoadAllTargets
945 setContextAfterLoad prev_context False []
946 GHC.workingDirectoryChanged
947 dir <- expandPath dir
948 io (setCurrentDirectory dir)
950 trySuccess :: GHC.GhcMonad m => m SuccessFlag -> m SuccessFlag
952 handleSourceError (\e -> do GHC.printExceptionAndWarnings e
956 editFile :: String -> GHCi ()
958 do file <- if null str then chooseEditFile else return str
962 $ ghcError (CmdLineError "editor not set, use :set editor")
963 io $ system (cmd ++ ' ':file)
966 -- The user didn't specify a file so we pick one for them.
967 -- Our strategy is to pick the first module that failed to load,
968 -- or otherwise the first target.
970 -- XXX: Can we figure out what happened if the depndecy analysis fails
971 -- (e.g., because the porgrammeer mistyped the name of a module)?
972 -- XXX: Can we figure out the location of an error to pass to the editor?
973 -- XXX: if we could figure out the list of errors that occured during the
974 -- last load/reaload, then we could start the editor focused on the first
976 chooseEditFile :: GHCi String
978 do let hasFailed x = fmap not $ GHC.isLoaded $ GHC.ms_mod_name x
980 graph <- GHC.getModuleGraph
981 failed_graph <- filterM hasFailed graph
982 let order g = flattenSCCs $ GHC.topSortModuleGraph True g Nothing
984 x : _ -> GHC.ml_hs_file (GHC.ms_location x)
987 case pick (order failed_graph) of
988 Just file -> return file
990 do targets <- GHC.getTargets
991 case msum (map fromTarget targets) of
992 Just file -> return file
993 Nothing -> ghcError (CmdLineError "No files to edit.")
995 where fromTarget (GHC.Target (GHC.TargetFile f _) _ _) = Just f
996 fromTarget _ = Nothing -- when would we get a module target?
998 defineMacro :: Bool{-overwrite-} -> String -> GHCi ()
999 defineMacro overwrite s = do
1000 let (macro_name, definition) = break isSpace s
1001 macros <- io (readIORef macros_ref)
1002 let defined = map cmdName macros
1003 if (null macro_name)
1004 then if null defined
1005 then io $ putStrLn "no macros defined"
1006 else io $ putStr ("the following macros are defined:\n" ++
1009 if (not overwrite && macro_name `elem` defined)
1010 then ghcError (CmdLineError
1011 ("macro '" ++ macro_name ++ "' is already defined"))
1014 let filtered = [ cmd | cmd <- macros, cmdName cmd /= macro_name ]
1016 -- give the expression a type signature, so we can be sure we're getting
1017 -- something of the right type.
1018 let new_expr = '(' : definition ++ ") :: String -> IO String"
1020 -- compile the expression
1021 handleSourceError (\e -> GHC.printExceptionAndWarnings e) $ do
1022 hv <- GHC.compileExpr new_expr
1023 io (writeIORef macros_ref --
1024 (filtered ++ [(macro_name, runMacro hv, Nothing, completeNone)]))
1026 runMacro :: GHC.HValue{-String -> IO String-} -> String -> GHCi Bool
1028 str <- io ((unsafeCoerce# fun :: String -> IO String) s)
1029 enqueueCommands (lines str)
1032 undefineMacro :: String -> GHCi ()
1033 undefineMacro str = mapM_ undef (words str)
1034 where undef macro_name = do
1035 cmds <- io (readIORef macros_ref)
1036 if (macro_name `notElem` map cmdName cmds)
1037 then ghcError (CmdLineError
1038 ("macro '" ++ macro_name ++ "' is not defined"))
1040 io (writeIORef macros_ref (filter ((/= macro_name) . cmdName) cmds))
1042 cmdCmd :: String -> GHCi ()
1044 let expr = '(' : str ++ ") :: IO String"
1045 handleSourceError (\e -> GHC.printExceptionAndWarnings e) $ do
1046 hv <- GHC.compileExpr expr
1047 cmds <- io $ (unsafeCoerce# hv :: IO String)
1048 enqueueCommands (lines cmds)
1051 loadModule :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
1052 loadModule fs = timeIt (loadModule' fs)
1054 loadModule_ :: [FilePath] -> GHCi ()
1055 loadModule_ fs = do loadModule (zip fs (repeat Nothing)); return ()
1057 loadModule' :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
1058 loadModule' files = do
1059 prev_context <- GHC.getContext
1063 discardActiveBreakPoints
1065 GHC.load LoadAllTargets
1068 let (filenames, phases) = unzip files
1069 exp_filenames <- mapM expandPath filenames
1070 let files' = zip exp_filenames phases
1071 targets <- mapM (uncurry GHC.guessTarget) files'
1073 -- NOTE: we used to do the dependency anal first, so that if it
1074 -- fails we didn't throw away the current set of modules. This would
1075 -- require some re-working of the GHC interface, so we'll leave it
1076 -- as a ToDo for now.
1078 GHC.setTargets targets
1079 doLoad False prev_context LoadAllTargets
1081 checkModule :: String -> GHCi ()
1083 let modl = GHC.mkModuleName m
1084 prev_context <- GHC.getContext
1085 ok <- handleSourceError (\e -> GHC.printExceptionAndWarnings e >> return False) $ do
1086 r <- GHC.typecheckModule =<< GHC.parseModule =<< GHC.getModSummary modl
1087 io $ putStrLn (showSDoc (
1088 case GHC.moduleInfo r of
1089 cm | Just scope <- GHC.modInfoTopLevelScope cm ->
1091 (local,global) = ASSERT( all isExternalName scope )
1092 partition ((== modl) . GHC.moduleName . GHC.nameModule) scope
1094 (text "global names: " <+> ppr global) $$
1095 (text "local names: " <+> ppr local)
1098 afterLoad (successIf ok) False prev_context
1100 reloadModule :: String -> GHCi ()
1102 prev_context <- GHC.getContext
1103 doLoad True prev_context $
1104 if null m then LoadAllTargets
1105 else LoadUpTo (GHC.mkModuleName m)
1108 doLoad :: Bool -> ([Module],[Module]) -> LoadHowMuch -> GHCi SuccessFlag
1109 doLoad retain_context prev_context howmuch = do
1110 -- turn off breakpoints before we load: we can't turn them off later, because
1111 -- the ModBreaks will have gone away.
1112 discardActiveBreakPoints
1113 ok <- trySuccess $ GHC.load howmuch
1114 afterLoad ok retain_context prev_context
1117 afterLoad :: SuccessFlag -> Bool -> ([Module],[Module]) -> GHCi ()
1118 afterLoad ok retain_context prev_context = do
1119 revertCAFs -- always revert CAFs on load.
1121 loaded_mod_summaries <- getLoadedModules
1122 let loaded_mods = map GHC.ms_mod loaded_mod_summaries
1123 loaded_mod_names = map GHC.moduleName loaded_mods
1124 modulesLoadedMsg ok loaded_mod_names
1126 setContextAfterLoad prev_context retain_context loaded_mod_summaries
1129 setContextAfterLoad :: ([Module],[Module]) -> Bool -> [GHC.ModSummary] -> GHCi ()
1130 setContextAfterLoad prev keep_ctxt [] = do
1131 prel_mod <- getPrelude
1132 setContextKeepingPackageModules prev keep_ctxt ([], [prel_mod])
1133 setContextAfterLoad prev keep_ctxt ms = do
1134 -- load a target if one is available, otherwise load the topmost module.
1135 targets <- GHC.getTargets
1136 case [ m | Just m <- map (findTarget ms) targets ] of
1138 let graph' = flattenSCCs (GHC.topSortModuleGraph True ms Nothing) in
1139 load_this (last graph')
1144 = case filter (`matches` t) ms of
1148 summary `matches` Target (TargetModule m) _ _
1149 = GHC.ms_mod_name summary == m
1150 summary `matches` Target (TargetFile f _) _ _
1151 | Just f' <- GHC.ml_hs_file (GHC.ms_location summary) = f == f'
1155 load_this summary | m <- GHC.ms_mod summary = do
1156 b <- GHC.moduleIsInterpreted m
1157 if b then setContextKeepingPackageModules prev keep_ctxt ([m], [])
1159 prel_mod <- getPrelude
1160 setContextKeepingPackageModules prev keep_ctxt ([],[prel_mod,m])
1162 -- | Keep any package modules (except Prelude) when changing the context.
1163 setContextKeepingPackageModules
1164 :: ([Module],[Module]) -- previous context
1165 -> Bool -- re-execute :module commands
1166 -> ([Module],[Module]) -- new context
1168 setContextKeepingPackageModules prev_context keep_ctxt (as,bs) = do
1169 let (_,bs0) = prev_context
1170 prel_mod <- getPrelude
1171 let pkg_modules = filter (\p -> not (isHomeModule p) && p /= prel_mod) bs0
1172 let bs1 = if null as then nub (prel_mod : bs) else bs
1173 GHC.setContext as (nub (bs1 ++ pkg_modules))
1177 mapM_ (playCtxtCmd False) (remembered_ctx st)
1180 setGHCiState st{ remembered_ctx = [] }
1182 isHomeModule :: Module -> Bool
1183 isHomeModule mod = GHC.modulePackageId mod == mainPackageId
1185 modulesLoadedMsg :: SuccessFlag -> [ModuleName] -> GHCi ()
1186 modulesLoadedMsg ok mods = do
1187 dflags <- getDynFlags
1188 when (verbosity dflags > 0) $ do
1190 | null mods = text "none."
1191 | otherwise = hsep (
1192 punctuate comma (map ppr mods)) <> text "."
1195 io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
1197 io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
1200 typeOfExpr :: String -> GHCi ()
1202 = handleSourceError (\e -> GHC.printExceptionAndWarnings e) $ do
1203 ty <- GHC.exprType str
1204 dflags <- getDynFlags
1205 let pefas = dopt Opt_PrintExplicitForalls dflags
1206 printForUser $ text str <+> dcolon
1207 <+> pprTypeForUser pefas ty
1209 kindOfType :: String -> GHCi ()
1211 = handleSourceError (\e -> GHC.printExceptionAndWarnings e) $ do
1212 ty <- GHC.typeKind str
1213 printForUser $ text str <+> dcolon <+> ppr ty
1215 quit :: String -> GHCi Bool
1216 quit _ = return True
1218 shellEscape :: String -> GHCi Bool
1219 shellEscape str = io (system str >> return False)
1221 -----------------------------------------------------------------------------
1222 -- Browsing a module's contents
1224 browseCmd :: Bool -> String -> GHCi ()
1227 ['*':s] | looksLikeModuleName s -> do
1228 m <- wantInterpretedModule s
1229 browseModule bang m False
1230 [s] | looksLikeModuleName s -> do
1232 browseModule bang m True
1234 (as,bs) <- GHC.getContext
1235 -- Guess which module the user wants to browse. Pick
1236 -- modules that are interpreted first. The most
1237 -- recently-added module occurs last, it seems.
1239 (as@(_:_), _) -> browseModule bang (last as) True
1240 ([], bs@(_:_)) -> browseModule bang (last bs) True
1241 ([], []) -> ghcError (CmdLineError ":browse: no current module")
1242 _ -> ghcError (CmdLineError "syntax: :browse <module>")
1244 -- without bang, show items in context of their parents and omit children
1245 -- with bang, show class methods and data constructors separately, and
1246 -- indicate import modules, to aid qualifying unqualified names
1247 -- with sorted, sort items alphabetically
1248 browseModule :: Bool -> Module -> Bool -> GHCi ()
1249 browseModule bang modl exports_only = do
1250 -- :browse! reports qualifiers wrt current context
1251 current_unqual <- GHC.getPrintUnqual
1252 -- Temporarily set the context to the module we're interested in,
1253 -- just so we can get an appropriate PrintUnqualified
1254 (as,bs) <- GHC.getContext
1255 prel_mod <- getPrelude
1256 if exports_only then GHC.setContext [] [prel_mod,modl]
1257 else GHC.setContext [modl] []
1258 target_unqual <- GHC.getPrintUnqual
1259 GHC.setContext as bs
1261 let unqual = if bang then current_unqual else target_unqual
1263 mb_mod_info <- GHC.getModuleInfo modl
1265 Nothing -> ghcError (CmdLineError ("unknown module: " ++
1266 GHC.moduleNameString (GHC.moduleName modl)))
1268 dflags <- getDynFlags
1270 | exports_only = GHC.modInfoExports mod_info
1271 | otherwise = GHC.modInfoTopLevelScope mod_info
1274 -- sort alphabetically name, but putting
1275 -- locally-defined identifiers first.
1276 -- We would like to improve this; see #1799.
1277 sorted_names = loc_sort local ++ occ_sort external
1279 (local,external) = ASSERT( all isExternalName names )
1280 partition ((==modl) . nameModule) names
1281 occ_sort = sortBy (compare `on` nameOccName)
1282 -- try to sort by src location. If the first name in
1283 -- our list has a good source location, then they all should.
1285 | n:_ <- names, isGoodSrcSpan (nameSrcSpan n)
1286 = sortBy (compare `on` nameSrcSpan) names
1290 mb_things <- mapM GHC.lookupName sorted_names
1291 let filtered_things = filterOutChildren (\t -> t) (catMaybes mb_things)
1293 rdr_env <- GHC.getGRE
1295 let pefas = dopt Opt_PrintExplicitForalls dflags
1296 things | bang = catMaybes mb_things
1297 | otherwise = filtered_things
1298 pretty | bang = pprTyThing
1299 | otherwise = pprTyThingInContext
1301 labels [] = text "-- not currently imported"
1302 labels l = text $ intercalate "\n" $ map qualifier l
1303 qualifier = maybe "-- defined locally"
1304 (("-- imported via "++) . intercalate ", "
1305 . map GHC.moduleNameString)
1306 importInfo = RdrName.getGRE_NameQualifier_maybes rdr_env
1307 modNames = map (importInfo . GHC.getName) things
1309 -- annotate groups of imports with their import modules
1310 -- the default ordering is somewhat arbitrary, so we group
1311 -- by header and sort groups; the names themselves should
1312 -- really come in order of source appearance.. (trac #1799)
1313 annotate mts = concatMap (\(m,ts)->labels m:ts)
1314 $ sortBy cmpQualifiers $ group mts
1315 where cmpQualifiers =
1316 compare `on` (map (fmap (map moduleNameFS)) . fst)
1318 group mts@((m,_):_) = (m,map snd g) : group ng
1319 where (g,ng) = partition ((==m).fst) mts
1321 let prettyThings = map (pretty pefas) things
1322 prettyThings' | bang = annotate $ zip modNames prettyThings
1323 | otherwise = prettyThings
1324 io (putStrLn $ showSDocForUser unqual (vcat prettyThings'))
1325 -- ToDo: modInfoInstances currently throws an exception for
1326 -- package modules. When it works, we can do this:
1327 -- $$ vcat (map GHC.pprInstance (GHC.modInfoInstances mod_info))
1329 -----------------------------------------------------------------------------
1330 -- Setting the module context
1332 setContext :: String -> GHCi ()
1334 | all sensible strs = do
1335 playCtxtCmd True (cmd, as, bs)
1337 setGHCiState st{ remembered_ctx = remembered_ctx st ++ [(cmd,as,bs)] }
1338 | otherwise = ghcError (CmdLineError "syntax: :module [+/-] [*]M1 ... [*]Mn")
1340 (cmd, strs, as, bs) =
1342 '+':stuff -> rest AddModules stuff
1343 '-':stuff -> rest RemModules stuff
1344 stuff -> rest SetContext stuff
1346 rest cmd stuff = (cmd, strs, as, bs)
1347 where strs = words stuff
1348 (as,bs) = partitionWith starred strs
1350 sensible ('*':m) = looksLikeModuleName m
1351 sensible m = looksLikeModuleName m
1353 starred ('*':m) = Left m
1356 playCtxtCmd :: Bool -> (CtxtCmd, [String], [String]) -> GHCi ()
1357 playCtxtCmd fail (cmd, as, bs)
1359 (as',bs') <- do_checks fail
1360 (prev_as,prev_bs) <- GHC.getContext
1364 prel_mod <- getPrelude
1365 let bs'' = if null as && prel_mod `notElem` bs' then prel_mod:bs'
1369 let as_to_add = as' \\ (prev_as ++ prev_bs)
1370 bs_to_add = bs' \\ (prev_as ++ prev_bs)
1371 return (prev_as ++ as_to_add, prev_bs ++ bs_to_add)
1373 let new_as = prev_as \\ (as' ++ bs')
1374 new_bs = prev_bs \\ (as' ++ bs')
1375 return (new_as, new_bs)
1376 GHC.setContext new_as new_bs
1379 as' <- mapM wantInterpretedModule as
1380 bs' <- mapM lookupModule bs
1382 do_checks False = do
1383 as' <- mapM (trymaybe . wantInterpretedModule) as
1384 bs' <- mapM (trymaybe . lookupModule) bs
1385 return (catMaybes as', catMaybes bs')
1390 Left _ -> return Nothing
1391 Right a -> return (Just a)
1393 ----------------------------------------------------------------------------
1396 -- set options in the interpreter. Syntax is exactly the same as the
1397 -- ghc command line, except that certain options aren't available (-C,
1400 -- This is pretty fragile: most options won't work as expected. ToDo:
1401 -- figure out which ones & disallow them.
1403 setCmd :: String -> GHCi ()
1405 = do st <- getGHCiState
1406 let opts = options st
1407 io $ putStrLn (showSDoc (
1408 text "options currently set: " <>
1411 else hsep (map (\o -> char '+' <> text (optToStr o)) opts)
1413 dflags <- getDynFlags
1414 io $ putStrLn (showSDoc (
1415 vcat (text "GHCi-specific dynamic flag settings:"
1416 :map (flagSetting dflags) ghciFlags)
1418 io $ putStrLn (showSDoc (
1419 vcat (text "other dynamic, non-language, flag settings:"
1420 :map (flagSetting dflags) nonLanguageDynFlags)
1422 where flagSetting dflags (str, f, _)
1423 | dopt f dflags = text " " <> text "-f" <> text str
1424 | otherwise = text " " <> text "-fno-" <> text str
1425 (ghciFlags,others) = partition (\(_, f, _) -> f `elem` flags)
1427 nonLanguageDynFlags = filterOut (\(_, f, _) -> f `elem` languageOptions)
1429 flags = [Opt_PrintExplicitForalls
1430 ,Opt_PrintBindResult
1431 ,Opt_BreakOnException
1433 ,Opt_PrintEvldWithShow
1436 = case getCmd str of
1437 Right ("args", rest) ->
1439 Left err -> io (hPutStrLn stderr err)
1440 Right args -> setArgs args
1441 Right ("prog", rest) ->
1443 Right [prog] -> setProg prog
1444 _ -> io (hPutStrLn stderr "syntax: :set prog <progname>")
1445 Right ("prompt", rest) -> setPrompt $ dropWhile isSpace rest
1446 Right ("editor", rest) -> setEditor $ dropWhile isSpace rest
1447 Right ("stop", rest) -> setStop $ dropWhile isSpace rest
1448 _ -> case toArgs str of
1449 Left err -> io (hPutStrLn stderr err)
1450 Right wds -> setOptions wds
1452 setArgs, setOptions :: [String] -> GHCi ()
1453 setProg, setEditor, setStop, setPrompt :: String -> GHCi ()
1457 setGHCiState st{ args = args }
1461 setGHCiState st{ progname = prog }
1465 setGHCiState st{ editor = cmd }
1467 setStop str@(c:_) | isDigit c
1468 = do let (nm_str,rest) = break (not.isDigit) str
1471 let old_breaks = breaks st
1472 if all ((/= nm) . fst) old_breaks
1473 then printForUser (text "Breakpoint" <+> ppr nm <+>
1474 text "does not exist")
1476 let new_breaks = map fn old_breaks
1477 fn (i,loc) | i == nm = (i,loc { onBreakCmd = dropWhile isSpace rest })
1478 | otherwise = (i,loc)
1479 setGHCiState st{ breaks = new_breaks }
1482 setGHCiState st{ stop = cmd }
1484 setPrompt value = do
1487 then io $ hPutStrLn stderr $ "syntax: :set prompt <prompt>, currently \"" ++ prompt st ++ "\""
1488 else setGHCiState st{ prompt = remQuotes value }
1490 remQuotes ('\"':xs) | not (null xs) && last xs == '\"' = init xs
1494 do -- first, deal with the GHCi opts (+s, +t, etc.)
1495 let (plus_opts, minus_opts) = partitionWith isPlus wds
1496 mapM_ setOpt plus_opts
1497 -- then, dynamic flags
1498 newDynFlags minus_opts
1500 newDynFlags :: [String] -> GHCi ()
1501 newDynFlags minus_opts = do
1502 dflags <- getDynFlags
1503 let pkg_flags = packageFlags dflags
1504 (dflags', leftovers, warns) <- io $ GHC.parseDynamicFlags dflags $ map noLoc minus_opts
1505 io $ handleFlagWarnings dflags' warns
1507 if (not (null leftovers))
1508 then ghcError $ errorsToGhcException leftovers
1511 new_pkgs <- setDynFlags dflags'
1513 -- if the package flags changed, we should reset the context
1514 -- and link the new packages.
1515 dflags <- getDynFlags
1516 when (packageFlags dflags /= pkg_flags) $ do
1517 io $ hPutStrLn stderr "package flags have changed, resetting and loading new packages..."
1519 GHC.load LoadAllTargets
1520 io (linkPackages dflags new_pkgs)
1521 -- package flags changed, we can't re-use any of the old context
1522 setContextAfterLoad ([],[]) False []
1526 unsetOptions :: String -> GHCi ()
1528 = do -- first, deal with the GHCi opts (+s, +t, etc.)
1529 let opts = words str
1530 (minus_opts, rest1) = partition isMinus opts
1531 (plus_opts, rest2) = partitionWith isPlus rest1
1533 if (not (null rest2))
1534 then io (putStrLn ("unknown option: '" ++ head rest2 ++ "'"))
1537 mapM_ unsetOpt plus_opts
1539 let no_flag ('-':'f':rest) = return ("-fno-" ++ rest)
1540 no_flag f = ghcError (ProgramError ("don't know how to reverse " ++ f))
1542 no_flags <- mapM no_flag minus_opts
1543 newDynFlags no_flags
1545 isMinus :: String -> Bool
1546 isMinus ('-':_) = True
1549 isPlus :: String -> Either String String
1550 isPlus ('+':opt) = Left opt
1551 isPlus other = Right other
1553 setOpt, unsetOpt :: String -> GHCi ()
1556 = case strToGHCiOpt str of
1557 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1558 Just o -> setOption o
1561 = case strToGHCiOpt str of
1562 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1563 Just o -> unsetOption o
1565 strToGHCiOpt :: String -> (Maybe GHCiOption)
1566 strToGHCiOpt "s" = Just ShowTiming
1567 strToGHCiOpt "t" = Just ShowType
1568 strToGHCiOpt "r" = Just RevertCAFs
1569 strToGHCiOpt _ = Nothing
1571 optToStr :: GHCiOption -> String
1572 optToStr ShowTiming = "s"
1573 optToStr ShowType = "t"
1574 optToStr RevertCAFs = "r"
1576 -- ---------------------------------------------------------------------------
1579 showCmd :: String -> GHCi ()
1583 ["args"] -> io $ putStrLn (show (args st))
1584 ["prog"] -> io $ putStrLn (show (progname st))
1585 ["prompt"] -> io $ putStrLn (show (prompt st))
1586 ["editor"] -> io $ putStrLn (show (editor st))
1587 ["stop"] -> io $ putStrLn (show (stop st))
1588 ["modules" ] -> showModules
1589 ["bindings"] -> showBindings
1590 ["linker"] -> io showLinkerState
1591 ["breaks"] -> showBkptTable
1592 ["context"] -> showContext
1593 ["packages"] -> showPackages
1594 ["languages"] -> showLanguages
1595 _ -> ghcError (CmdLineError ("syntax: :show [ args | prog | prompt | editor | stop | modules | bindings\n"++
1596 " | breaks | context | packages | languages ]"))
1598 showModules :: GHCi ()
1600 loaded_mods <- getLoadedModules
1601 -- we want *loaded* modules only, see #1734
1602 let show_one ms = do m <- GHC.showModule ms; io (putStrLn m)
1603 mapM_ show_one loaded_mods
1605 getLoadedModules :: GHCi [GHC.ModSummary]
1606 getLoadedModules = do
1607 graph <- GHC.getModuleGraph
1608 filterM (GHC.isLoaded . GHC.ms_mod_name) graph
1610 showBindings :: GHCi ()
1612 bindings <- GHC.getBindings
1613 docs <- pprTypeAndContents
1614 [ id | AnId id <- sortBy compareTyThings bindings]
1615 printForUserPartWay docs
1617 compareTyThings :: TyThing -> TyThing -> Ordering
1618 t1 `compareTyThings` t2 = getName t1 `compareNames` getName t2
1620 printTyThing :: TyThing -> GHCi ()
1621 printTyThing tyth = do dflags <- getDynFlags
1622 let pefas = dopt Opt_PrintExplicitForalls dflags
1623 printForUser (pprTyThing pefas tyth)
1625 showBkptTable :: GHCi ()
1628 printForUser $ prettyLocations (breaks st)
1630 showContext :: GHCi ()
1632 resumes <- GHC.getResumeContext
1633 printForUser $ vcat (map pp_resume (reverse resumes))
1636 ptext (sLit "--> ") <> text (GHC.resumeStmt resume)
1637 $$ nest 2 (ptext (sLit "Stopped at") <+> ppr (GHC.resumeSpan resume))
1639 showPackages :: GHCi ()
1641 pkg_flags <- fmap packageFlags getDynFlags
1642 io $ putStrLn $ showSDoc $ vcat $
1643 text ("active package flags:"++if null pkg_flags then " none" else "")
1644 : map showFlag pkg_flags
1645 pkg_ids <- fmap (preloadPackages . pkgState) getDynFlags
1646 io $ putStrLn $ showSDoc $ vcat $
1647 text "packages currently loaded:"
1648 : map (nest 2 . text . packageIdString)
1649 (sortBy (compare `on` packageIdFS) pkg_ids)
1650 where showFlag (ExposePackage p) = text $ " -package " ++ p
1651 showFlag (HidePackage p) = text $ " -hide-package " ++ p
1652 showFlag (IgnorePackage p) = text $ " -ignore-package " ++ p
1654 showLanguages :: GHCi ()
1656 dflags <- getDynFlags
1657 io $ putStrLn $ showSDoc $ vcat $
1658 text "active language flags:" :
1659 [text (" -X" ++ str) | (str, f, _) <- DynFlags.xFlags, dopt f dflags]
1661 -- -----------------------------------------------------------------------------
1664 completeNone :: String -> IO [String]
1665 completeNone _w = return []
1667 completeMacro, completeIdentifier, completeModule,
1668 completeHomeModule, completeSetOptions, completeFilename,
1669 completeHomeModuleOrFile
1670 :: String -> IO [String]
1673 completeWord :: String -> Int -> Int -> IO (Maybe (String, [String]))
1674 completeWord w start end = do
1675 line <- Readline.getLineBuffer
1676 let line_words = words (dropWhile isSpace line)
1678 ':':_ | all isSpace (take (start-1) line) -> wrapCompleter completeCmd w
1680 | ((':':c) : _) <- line_words -> do
1681 completionVars <- lookupCompletionVars c
1682 case completionVars of
1683 (Nothing,complete) -> wrapCompleter complete w
1684 (Just breakChars,complete)
1685 -> let (n,w') = selectWord
1686 (words' (`elem` breakChars) 0 line)
1687 complete' w = do rets <- complete w
1688 return (map (drop n) rets)
1689 in wrapCompleter complete' w'
1690 | ("import" : _) <- line_words ->
1691 wrapCompleter completeModule w
1693 --printf "complete %s, start = %d, end = %d\n" w start end
1694 wrapCompleter completeIdentifier w
1695 where words' _ _ [] = []
1696 words' isBreak n str = let (w,r) = break isBreak str
1697 (s,r') = span isBreak r
1698 in (n,w):words' isBreak (n+length w+length s) r'
1699 -- In a Haskell expression we want to parse 'a-b' as three words
1700 -- where a compiler flag (e.g. -ddump-simpl) should
1701 -- only be a single word.
1702 selectWord [] = (0,w)
1703 selectWord ((offset,x):xs)
1704 | offset+length x >= start = (start-offset,take (end-offset) x)
1705 | otherwise = selectWord xs
1707 lookupCompletionVars ('!':_) = return (Just filenameWordBreakChars,
1709 lookupCompletionVars c = do
1710 maybe_cmd <- lookupCommand' c
1712 Just (_,_,ws,f) -> return (ws,f)
1713 Nothing -> return (Just filenameWordBreakChars,
1717 completeCmd :: String -> IO [String]
1719 cmds <- readIORef macros_ref
1720 return (filter (w `isPrefixOf`) (map (':':)
1721 (map cmdName (builtin_commands ++ cmds))))
1723 completeMacro w = do
1724 cmds <- readIORef macros_ref
1725 return (filter (w `isPrefixOf`) (map cmdName cmds))
1727 completeIdentifier w = do
1728 rdrs <- withRestoredSession GHC.getRdrNamesInScope
1729 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) rdrs))
1731 completeModule w = do
1732 dflags <- withRestoredSession GHC.getSessionDynFlags
1733 let pkg_mods = allExposedModules dflags
1734 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) pkg_mods))
1736 completeHomeModule w = do
1737 g <- withRestoredSession GHC.getModuleGraph
1738 let home_mods = map GHC.ms_mod_name g
1739 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) home_mods))
1741 completeSetOptions w = do
1742 return (filter (w `isPrefixOf`) options)
1743 where options = "args":"prog":allFlags
1745 completeFilename w = do
1746 ws <- Readline.filenameCompletionFunction w
1748 -- If we only found one result, and it's a directory,
1749 -- add a trailing slash.
1751 isDir <- expandPathIO file >>= doesDirectoryExist
1752 if isDir && last file /= '/'
1753 then return [file ++ "/"]
1758 completeHomeModuleOrFile = unionComplete completeHomeModule completeFilename
1760 unionComplete :: (String -> IO [String]) -> (String -> IO [String]) -> String -> IO [String]
1761 unionComplete f1 f2 w = do
1766 wrapCompleter :: (String -> IO [String]) -> String -> IO (Maybe (String,[String]))
1767 wrapCompleter fun w = do
1770 [] -> Readline.setAttemptedCompletionOver True >> return Nothing
1771 [x] -> -- Add a trailing space, unless it already has an appended slash.
1772 let appended = if last x == '/' then x else x ++ " "
1773 in return (Just (appended,[]))
1774 xs -> case getCommonPrefix xs of
1775 "" -> return (Just ("",xs))
1776 pref -> return (Just (pref,xs))
1778 getCommonPrefix :: [String] -> String
1779 getCommonPrefix [] = ""
1780 getCommonPrefix (s:ss) = foldl common s ss
1781 where common _s "" = ""
1783 common (c:cs) (d:ds)
1784 | c == d = c : common cs ds
1787 allExposedModules :: DynFlags -> [ModuleName]
1788 allExposedModules dflags
1789 = concat (map exposedModules (filter exposed (eltsUFM pkg_db)))
1791 pkg_db = pkgIdMap (pkgState dflags)
1793 completeMacro = completeNone
1794 completeIdentifier = completeNone
1795 completeModule = completeNone
1796 completeHomeModule = completeNone
1797 completeSetOptions = completeNone
1798 completeFilename = completeNone
1799 completeHomeModuleOrFile=completeNone
1802 -- ---------------------------------------------------------------------------
1803 -- User code exception handling
1805 -- This is the exception handler for exceptions generated by the
1806 -- user's code and exceptions coming from children sessions;
1807 -- it normally just prints out the exception. The
1808 -- handler must be recursive, in case showing the exception causes
1809 -- more exceptions to be raised.
1811 -- Bugfix: if the user closed stdout or stderr, the flushing will fail,
1812 -- raising another exception. We therefore don't put the recursive
1813 -- handler arond the flushing operation, so if stderr is closed
1814 -- GHCi will just die gracefully rather than going into an infinite loop.
1815 handler :: SomeException -> GHCi Bool
1817 handler exception = do
1819 io installSignalHandlers
1820 ghciHandle handler (showException exception >> return False)
1822 showException :: SomeException -> GHCi ()
1823 #if __GLASGOW_HASKELL__ < 609
1824 showException (DynException dyn) =
1825 case fromDynamic dyn of
1826 Nothing -> io (putStrLn ("*** Exception: (unknown)"))
1827 Just Interrupted -> io (putStrLn "Interrupted.")
1828 Just (CmdLineError s) -> io (putStrLn s) -- omit the location for CmdLineError
1829 Just ph@PhaseFailed{} -> io (putStrLn (showGhcException ph "")) -- ditto
1830 Just other_ghc_ex -> io (print other_ghc_ex)
1832 showException other_exception
1833 = io (putStrLn ("*** Exception: " ++ show other_exception))
1835 showException (SomeException e) =
1837 Just Interrupted -> putStrLn "Interrupted."
1838 -- omit the location for CmdLineError:
1839 Just (CmdLineError s) -> putStrLn s
1841 Just ph@(PhaseFailed {}) -> putStrLn (showGhcException ph "")
1842 Just other_ghc_ex -> print other_ghc_ex
1843 Nothing -> putStrLn ("*** Exception: " ++ show e)
1846 -----------------------------------------------------------------------------
1847 -- recursive exception handlers
1849 -- Don't forget to unblock async exceptions in the handler, or if we're
1850 -- in an exception loop (eg. let a = error a in a) the ^C exception
1851 -- may never be delivered. Thanks to Marcin for pointing out the bug.
1853 ghciHandle :: (SomeException -> GHCi a) -> GHCi a -> GHCi a
1854 ghciHandle h (GHCi m) = GHCi $ \s ->
1856 (\e -> unGHCi (ghciUnblock (h e)) s)
1858 ghciUnblock :: GHCi a -> GHCi a
1859 ghciUnblock (GHCi a) =
1860 GHCi $ \s -> reifyGhc $ \gs ->
1861 Exception.unblock (reflectGhc (a s) gs)
1863 ghciTry :: GHCi a -> GHCi (Either SomeException a)
1864 ghciTry (GHCi m) = GHCi $ \s -> gtry (m s)
1866 -- ----------------------------------------------------------------------------
1869 expandPath :: String -> GHCi String
1870 expandPath path = io (expandPathIO path)
1872 expandPathIO :: String -> IO String
1874 case dropWhile isSpace path of
1876 tilde <- getHomeDirectory -- will fail if HOME not defined
1877 return (tilde ++ '/':d)
1881 wantInterpretedModule :: String -> GHCi Module
1882 wantInterpretedModule str = do
1883 modl <- lookupModule str
1884 dflags <- getDynFlags
1885 when (GHC.modulePackageId modl /= thisPackage dflags) $
1886 ghcError (CmdLineError ("module '" ++ str ++ "' is from another package;\nthis command requires an interpreted module"))
1887 is_interpreted <- GHC.moduleIsInterpreted modl
1888 when (not is_interpreted) $
1889 ghcError (CmdLineError ("module '" ++ str ++ "' is not interpreted; try \':add *" ++ str ++ "' first"))
1892 wantNameFromInterpretedModule :: (Name -> SDoc -> GHCi ()) -> String
1893 -> (Name -> GHCi ())
1895 wantNameFromInterpretedModule noCanDo str and_then =
1896 handleSourceError (GHC.printExceptionAndWarnings) $ do
1897 names <- GHC.parseName str
1901 let modl = ASSERT( isExternalName n ) GHC.nameModule n
1902 if not (GHC.isExternalName n)
1903 then noCanDo n $ ppr n <>
1904 text " is not defined in an interpreted module"
1906 is_interpreted <- GHC.moduleIsInterpreted modl
1907 if not is_interpreted
1908 then noCanDo n $ text "module " <> ppr modl <>
1909 text " is not interpreted"
1912 -- -----------------------------------------------------------------------------
1913 -- commands for debugger
1915 sprintCmd, printCmd, forceCmd :: String -> GHCi ()
1916 sprintCmd = pprintCommand False False
1917 printCmd = pprintCommand True False
1918 forceCmd = pprintCommand False True
1920 pprintCommand :: Bool -> Bool -> String -> GHCi ()
1921 pprintCommand bind force str = do
1922 pprintClosureCommand bind force str
1924 stepCmd :: String -> GHCi ()
1925 stepCmd [] = doContinue (const True) GHC.SingleStep
1926 stepCmd expression = do runStmt expression GHC.SingleStep; return ()
1928 stepLocalCmd :: String -> GHCi ()
1929 stepLocalCmd [] = do
1930 mb_span <- getCurrentBreakSpan
1932 Nothing -> stepCmd []
1934 Just mod <- getCurrentBreakModule
1935 current_toplevel_decl <- enclosingTickSpan mod loc
1936 doContinue (`isSubspanOf` current_toplevel_decl) GHC.SingleStep
1938 stepLocalCmd expression = stepCmd expression
1940 stepModuleCmd :: String -> GHCi ()
1941 stepModuleCmd [] = do
1942 mb_span <- getCurrentBreakSpan
1944 Nothing -> stepCmd []
1946 Just span <- getCurrentBreakSpan
1947 let f some_span = srcSpanFileName_maybe span == srcSpanFileName_maybe some_span
1948 doContinue f GHC.SingleStep
1950 stepModuleCmd expression = stepCmd expression
1952 -- | Returns the span of the largest tick containing the srcspan given
1953 enclosingTickSpan :: Module -> SrcSpan -> GHCi SrcSpan
1954 enclosingTickSpan mod src = do
1955 ticks <- getTickArray mod
1956 let line = srcSpanStartLine src
1957 ASSERT (inRange (bounds ticks) line) do
1958 let enclosing_spans = [ span | (_,span) <- ticks ! line
1959 , srcSpanEnd span >= srcSpanEnd src]
1960 return . head . sortBy leftmost_largest $ enclosing_spans
1962 traceCmd :: String -> GHCi ()
1963 traceCmd [] = doContinue (const True) GHC.RunAndLogSteps
1964 traceCmd expression = do runStmt expression GHC.RunAndLogSteps; return ()
1966 continueCmd :: String -> GHCi ()
1967 continueCmd = noArgs $ doContinue (const True) GHC.RunToCompletion
1969 -- doContinue :: SingleStep -> GHCi ()
1970 doContinue :: (SrcSpan -> Bool) -> SingleStep -> GHCi ()
1971 doContinue pred step = do
1972 runResult <- resume step
1973 afterRunStmt pred runResult
1976 abandonCmd :: String -> GHCi ()
1977 abandonCmd = noArgs $ do
1978 b <- GHC.abandon -- the prompt will change to indicate the new context
1979 when (not b) $ io $ putStrLn "There is no computation running."
1982 deleteCmd :: String -> GHCi ()
1983 deleteCmd argLine = do
1984 deleteSwitch $ words argLine
1986 deleteSwitch :: [String] -> GHCi ()
1988 io $ putStrLn "The delete command requires at least one argument."
1989 -- delete all break points
1990 deleteSwitch ("*":_rest) = discardActiveBreakPoints
1991 deleteSwitch idents = do
1992 mapM_ deleteOneBreak idents
1994 deleteOneBreak :: String -> GHCi ()
1996 | all isDigit str = deleteBreak (read str)
1997 | otherwise = return ()
1999 historyCmd :: String -> GHCi ()
2001 | null arg = history 20
2002 | all isDigit arg = history (read arg)
2003 | otherwise = io $ putStrLn "Syntax: :history [num]"
2006 resumes <- GHC.getResumeContext
2008 [] -> io $ putStrLn "Not stopped at a breakpoint"
2010 let hist = GHC.resumeHistory r
2011 (took,rest) = splitAt num hist
2013 [] -> io $ putStrLn $
2014 "Empty history. Perhaps you forgot to use :trace?"
2016 spans <- mapM GHC.getHistorySpan took
2017 let nums = map (printf "-%-3d:") [(1::Int)..]
2018 names = map GHC.historyEnclosingDecl took
2019 printForUser (vcat(zipWith3
2020 (\x y z -> x <+> y <+> z)
2022 (map (bold . ppr) names)
2023 (map (parens . ppr) spans)))
2024 io $ putStrLn $ if null rest then "<end of history>" else "..."
2026 bold :: SDoc -> SDoc
2027 bold c | do_bold = text start_bold <> c <> text end_bold
2030 backCmd :: String -> GHCi ()
2031 backCmd = noArgs $ do
2032 (names, _, span) <- GHC.back
2033 printForUser $ ptext (sLit "Logged breakpoint at") <+> ppr span
2034 printTypeOfNames names
2035 -- run the command set with ":set stop <cmd>"
2037 enqueueCommands [stop st]
2039 forwardCmd :: String -> GHCi ()
2040 forwardCmd = noArgs $ do
2041 (names, ix, span) <- GHC.forward
2042 printForUser $ (if (ix == 0)
2043 then ptext (sLit "Stopped at")
2044 else ptext (sLit "Logged breakpoint at")) <+> ppr span
2045 printTypeOfNames names
2046 -- run the command set with ":set stop <cmd>"
2048 enqueueCommands [stop st]
2050 -- handle the "break" command
2051 breakCmd :: String -> GHCi ()
2052 breakCmd argLine = do
2053 breakSwitch $ words argLine
2055 breakSwitch :: [String] -> GHCi ()
2057 io $ putStrLn "The break command requires at least one argument."
2058 breakSwitch (arg1:rest)
2059 | looksLikeModuleName arg1 && not (null rest) = do
2060 mod <- wantInterpretedModule arg1
2061 breakByModule mod rest
2062 | all isDigit arg1 = do
2063 (toplevel, _) <- GHC.getContext
2065 (mod : _) -> breakByModuleLine mod (read arg1) rest
2067 io $ putStrLn "Cannot find default module for breakpoint."
2068 io $ putStrLn "Perhaps no modules are loaded for debugging?"
2069 | otherwise = do -- try parsing it as an identifier
2070 wantNameFromInterpretedModule noCanDo arg1 $ \name -> do
2071 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
2072 if GHC.isGoodSrcLoc loc
2073 then ASSERT( isExternalName name )
2074 findBreakAndSet (GHC.nameModule name) $
2075 findBreakByCoord (Just (GHC.srcLocFile loc))
2076 (GHC.srcLocLine loc,
2078 else noCanDo name $ text "can't find its location: " <> ppr loc
2080 noCanDo n why = printForUser $
2081 text "cannot set breakpoint on " <> ppr n <> text ": " <> why
2083 breakByModule :: Module -> [String] -> GHCi ()
2084 breakByModule mod (arg1:rest)
2085 | all isDigit arg1 = do -- looks like a line number
2086 breakByModuleLine mod (read arg1) rest
2090 breakByModuleLine :: Module -> Int -> [String] -> GHCi ()
2091 breakByModuleLine mod line args
2092 | [] <- args = findBreakAndSet mod $ findBreakByLine line
2093 | [col] <- args, all isDigit col =
2094 findBreakAndSet mod $ findBreakByCoord Nothing (line, read col)
2095 | otherwise = breakSyntax
2098 breakSyntax = ghcError (CmdLineError "Syntax: :break [<mod>] <line> [<column>]")
2100 findBreakAndSet :: Module -> (TickArray -> Maybe (Int, SrcSpan)) -> GHCi ()
2101 findBreakAndSet mod lookupTickTree = do
2102 tickArray <- getTickArray mod
2103 (breakArray, _) <- getModBreak mod
2104 case lookupTickTree tickArray of
2105 Nothing -> io $ putStrLn $ "No breakpoints found at that location."
2106 Just (tick, span) -> do
2107 success <- io $ setBreakFlag True breakArray tick
2111 recordBreak $ BreakLocation
2118 text "Breakpoint " <> ppr nm <>
2120 then text " was already set at " <> ppr span
2121 else text " activated at " <> ppr span
2123 printForUser $ text "Breakpoint could not be activated at"
2126 -- When a line number is specified, the current policy for choosing
2127 -- the best breakpoint is this:
2128 -- - the leftmost complete subexpression on the specified line, or
2129 -- - the leftmost subexpression starting on the specified line, or
2130 -- - the rightmost subexpression enclosing the specified line
2132 findBreakByLine :: Int -> TickArray -> Maybe (BreakIndex,SrcSpan)
2133 findBreakByLine line arr
2134 | not (inRange (bounds arr) line) = Nothing
2136 listToMaybe (sortBy (leftmost_largest `on` snd) complete) `mplus`
2137 listToMaybe (sortBy (leftmost_smallest `on` snd) incomplete) `mplus`
2138 listToMaybe (sortBy (rightmost `on` snd) ticks)
2142 starts_here = [ tick | tick@(_,span) <- ticks,
2143 GHC.srcSpanStartLine span == line ]
2145 (complete,incomplete) = partition ends_here starts_here
2146 where ends_here (_,span) = GHC.srcSpanEndLine span == line
2148 findBreakByCoord :: Maybe FastString -> (Int,Int) -> TickArray
2149 -> Maybe (BreakIndex,SrcSpan)
2150 findBreakByCoord mb_file (line, col) arr
2151 | not (inRange (bounds arr) line) = Nothing
2153 listToMaybe (sortBy (rightmost `on` snd) contains ++
2154 sortBy (leftmost_smallest `on` snd) after_here)
2158 -- the ticks that span this coordinate
2159 contains = [ tick | tick@(_,span) <- ticks, span `spans` (line,col),
2160 is_correct_file span ]
2162 is_correct_file span
2163 | Just f <- mb_file = GHC.srcSpanFile span == f
2166 after_here = [ tick | tick@(_,span) <- ticks,
2167 GHC.srcSpanStartLine span == line,
2168 GHC.srcSpanStartCol span >= col ]
2170 -- For now, use ANSI bold on terminals that we know support it.
2171 -- Otherwise, we add a line of carets under the active expression instead.
2172 -- In particular, on Windows and when running the testsuite (which sets
2173 -- TERM to vt100 for other reasons) we get carets.
2174 -- We really ought to use a proper termcap/terminfo library.
2176 do_bold = (`isPrefixOf` unsafePerformIO mTerm) `any` ["xterm", "linux"]
2177 where mTerm = System.Environment.getEnv "TERM"
2178 `catchIO` \_ -> return "TERM not set"
2180 start_bold :: String
2181 start_bold = "\ESC[1m"
2183 end_bold = "\ESC[0m"
2185 listCmd :: String -> GHCi ()
2187 mb_span <- getCurrentBreakSpan
2190 printForUser $ text "Not stopped at a breakpoint; nothing to list"
2192 | GHC.isGoodSrcSpan span -> io $ listAround span True
2194 do resumes <- GHC.getResumeContext
2196 [] -> panic "No resumes"
2198 do let traceIt = case GHC.resumeHistory r of
2199 [] -> text "rerunning with :trace,"
2201 doWhat = traceIt <+> text ":back then :list"
2202 printForUser (text "Unable to list source for" <+>
2204 $$ text "Try" <+> doWhat)
2205 listCmd str = list2 (words str)
2207 list2 :: [String] -> GHCi ()
2208 list2 [arg] | all isDigit arg = do
2209 (toplevel, _) <- GHC.getContext
2211 [] -> io $ putStrLn "No module to list"
2212 (mod : _) -> listModuleLine mod (read arg)
2213 list2 [arg1,arg2] | looksLikeModuleName arg1, all isDigit arg2 = do
2214 mod <- wantInterpretedModule arg1
2215 listModuleLine mod (read arg2)
2217 wantNameFromInterpretedModule noCanDo arg $ \name -> do
2218 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
2219 if GHC.isGoodSrcLoc loc
2221 tickArray <- ASSERT( isExternalName name )
2222 getTickArray (GHC.nameModule name)
2223 let mb_span = findBreakByCoord (Just (GHC.srcLocFile loc))
2224 (GHC.srcLocLine loc, GHC.srcLocCol loc)
2227 Nothing -> io $ listAround (GHC.srcLocSpan loc) False
2228 Just (_,span) -> io $ listAround span False
2230 noCanDo name $ text "can't find its location: " <>
2233 noCanDo n why = printForUser $
2234 text "cannot list source code for " <> ppr n <> text ": " <> why
2236 io $ putStrLn "syntax: :list [<line> | <module> <line> | <identifier>]"
2238 listModuleLine :: Module -> Int -> GHCi ()
2239 listModuleLine modl line = do
2240 graph <- GHC.getModuleGraph
2241 let this = filter ((== modl) . GHC.ms_mod) graph
2243 [] -> panic "listModuleLine"
2245 let filename = fromJust (ml_hs_file (GHC.ms_location summ))
2246 loc = GHC.mkSrcLoc (mkFastString (filename)) line 0
2247 io $ listAround (GHC.srcLocSpan loc) False
2249 -- | list a section of a source file around a particular SrcSpan.
2250 -- If the highlight flag is True, also highlight the span using
2251 -- start_bold\/end_bold.
2252 listAround :: SrcSpan -> Bool -> IO ()
2253 listAround span do_highlight = do
2254 contents <- BS.readFile (unpackFS file)
2256 lines = BS.split '\n' contents
2257 these_lines = take (line2 - line1 + 1 + pad_before + pad_after) $
2258 drop (line1 - 1 - pad_before) $ lines
2259 fst_line = max 1 (line1 - pad_before)
2260 line_nos = [ fst_line .. ]
2262 highlighted | do_highlight = zipWith highlight line_nos these_lines
2263 | otherwise = [\p -> BS.concat[p,l] | l <- these_lines]
2265 bs_line_nos = [ BS.pack (show l ++ " ") | l <- line_nos ]
2266 prefixed = zipWith ($) highlighted bs_line_nos
2268 BS.putStrLn (BS.intercalate (BS.pack "\n") prefixed)
2270 file = GHC.srcSpanFile span
2271 line1 = GHC.srcSpanStartLine span
2272 col1 = GHC.srcSpanStartCol span
2273 line2 = GHC.srcSpanEndLine span
2274 col2 = GHC.srcSpanEndCol span
2276 pad_before | line1 == 1 = 0
2280 highlight | do_bold = highlight_bold
2281 | otherwise = highlight_carets
2283 highlight_bold no line prefix
2284 | no == line1 && no == line2
2285 = let (a,r) = BS.splitAt col1 line
2286 (b,c) = BS.splitAt (col2-col1) r
2288 BS.concat [prefix, a,BS.pack start_bold,b,BS.pack end_bold,c]
2290 = let (a,b) = BS.splitAt col1 line in
2291 BS.concat [prefix, a, BS.pack start_bold, b]
2293 = let (a,b) = BS.splitAt col2 line in
2294 BS.concat [prefix, a, BS.pack end_bold, b]
2295 | otherwise = BS.concat [prefix, line]
2297 highlight_carets no line prefix
2298 | no == line1 && no == line2
2299 = BS.concat [prefix, line, nl, indent, BS.replicate col1 ' ',
2300 BS.replicate (col2-col1) '^']
2302 = BS.concat [indent, BS.replicate (col1 - 2) ' ', BS.pack "vv", nl,
2305 = BS.concat [prefix, line, nl, indent, BS.replicate col2 ' ',
2307 | otherwise = BS.concat [prefix, line]
2309 indent = BS.pack (" " ++ replicate (length (show no)) ' ')
2310 nl = BS.singleton '\n'
2312 -- --------------------------------------------------------------------------
2315 getTickArray :: Module -> GHCi TickArray
2316 getTickArray modl = do
2318 let arrmap = tickarrays st
2319 case lookupModuleEnv arrmap modl of
2320 Just arr -> return arr
2322 (_breakArray, ticks) <- getModBreak modl
2323 let arr = mkTickArray (assocs ticks)
2324 setGHCiState st{tickarrays = extendModuleEnv arrmap modl arr}
2327 discardTickArrays :: GHCi ()
2328 discardTickArrays = do
2330 setGHCiState st{tickarrays = emptyModuleEnv}
2332 mkTickArray :: [(BreakIndex,SrcSpan)] -> TickArray
2334 = accumArray (flip (:)) [] (1, max_line)
2335 [ (line, (nm,span)) | (nm,span) <- ticks,
2336 line <- srcSpanLines span ]
2338 max_line = foldr max 0 (map GHC.srcSpanEndLine (map snd ticks))
2339 srcSpanLines span = [ GHC.srcSpanStartLine span ..
2340 GHC.srcSpanEndLine span ]
2342 lookupModule :: String -> GHCi Module
2343 lookupModule modName
2344 = GHC.findModule (GHC.mkModuleName modName) Nothing
2346 -- don't reset the counter back to zero?
2347 discardActiveBreakPoints :: GHCi ()
2348 discardActiveBreakPoints = do
2350 mapM (turnOffBreak.snd) (breaks st)
2351 setGHCiState $ st { breaks = [] }
2353 deleteBreak :: Int -> GHCi ()
2354 deleteBreak identity = do
2356 let oldLocations = breaks st
2357 (this,rest) = partition (\loc -> fst loc == identity) oldLocations
2359 then printForUser (text "Breakpoint" <+> ppr identity <+>
2360 text "does not exist")
2362 mapM (turnOffBreak.snd) this
2363 setGHCiState $ st { breaks = rest }
2365 turnOffBreak :: BreakLocation -> GHCi Bool
2366 turnOffBreak loc = do
2367 (arr, _) <- getModBreak (breakModule loc)
2368 io $ setBreakFlag False arr (breakTick loc)
2370 getModBreak :: Module -> GHCi (GHC.BreakArray, Array Int SrcSpan)
2371 getModBreak mod = do
2372 Just mod_info <- GHC.getModuleInfo mod
2373 let modBreaks = GHC.modInfoModBreaks mod_info
2374 let array = GHC.modBreaks_flags modBreaks
2375 let ticks = GHC.modBreaks_locs modBreaks
2376 return (array, ticks)
2378 setBreakFlag :: Bool -> GHC.BreakArray -> Int -> IO Bool
2379 setBreakFlag toggle array index
2380 | toggle = GHC.setBreakOn array index
2381 | otherwise = GHC.setBreakOff array index