1 {-# OPTIONS -fno-warn-incomplete-patterns -optc-DNON_POSIX_SOURCE #-}
3 -- The above warning supression flag is a temporary kludge.
4 -- While working on this module you are encouraged to remove it and fix
5 -- any warnings in the module. See
6 -- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
9 -----------------------------------------------------------------------------
13 -- (c) The University of Glasgow 2005
15 -----------------------------------------------------------------------------
17 module Main (main) where
19 #include "HsVersions.h"
21 -- The official GHC API
23 import GHC ( Session, DynFlags(..), HscTarget(..),
24 GhcMode(..), GhcLink(..),
25 LoadHowMuch(..), dopt, DynFlag(..) )
28 -- Implementations of the various modes (--show-iface, mkdependHS. etc.)
29 import LoadIface ( showIface )
30 import HscMain ( newHscEnv )
31 import DriverPipeline ( oneShot, compileFile )
32 import DriverMkDepend ( doMkDependHS )
34 import InteractiveUI ( interactiveUI, ghciWelcomeMsg )
37 -- Various other random stuff that we need
39 import Packages ( dumpPackages )
40 import DriverPhases ( Phase(..), isSourceFilename, anyHsc,
41 startPhase, isHaskellSrcFilename )
44 import BasicTypes ( failed )
45 import ErrUtils ( putMsg )
46 import FastString ( getFastStringTable, isZEncoded, hasZEncoding )
51 -- Standard Haskell libraries
52 import Control.Exception ( throwDyn )
54 import System.Directory ( doesDirectoryExist )
55 import System.Environment
61 -----------------------------------------------------------------------------
64 -- time commands when run with -v
66 -- Win32 support: proper signal handling
67 -- reading the package configuration file is too slow
70 -----------------------------------------------------------------------------
71 -- GHC's command-line interface
74 GHC.defaultErrorHandler defaultDynFlags $ do
76 -- 1. extract the -B flag from the args
80 (minusB_args, argv1) = partition ("-B" `isPrefixOf`) argv0
81 mbMinusB | null minusB_args = Nothing
82 | otherwise = Just (drop 2 (last minusB_args))
84 argv2 <- parseStaticFlags argv1
86 -- 2. Parse the "mode" flags (--make, --interactive etc.)
87 (cli_mode, argv3) <- parseModeFlags argv2
89 -- If all we want to do is to show the version number then do it
90 -- now, before we start a GHC session etc.
91 -- If we do it later then bootstrapping gets confused as it tries
92 -- to find out what version of GHC it's using before package.conf
93 -- exists, so starting the session fails.
95 ShowInfo -> do showInfo
97 ShowSupportedLanguages -> do showSupportedLanguages
99 ShowVersion -> do showVersion
101 ShowNumVersion -> do putStrLn cProjectVersion
105 -- start our GHC session
106 session <- GHC.newSession mbMinusB
108 dflags0 <- GHC.getSessionDynFlags session
110 -- set the default GhcMode, HscTarget and GhcLink. The HscTarget
111 -- can be further adjusted on a module by module basis, using only
112 -- the -fvia-C and -fasm flags. If the default HscTarget is not
113 -- HscC or HscAsm, -fvia-C and -fasm have no effect.
114 let dflt_target = hscTarget dflags0
117 DoInteractive -> (CompManager, HscInterpreted, LinkInMemory)
118 DoEval _ -> (CompManager, HscInterpreted, LinkInMemory)
119 DoMake -> (CompManager, dflt_target, LinkBinary)
120 DoMkDependHS -> (MkDepend, dflt_target, LinkBinary)
121 _ -> (OneShot, dflt_target, LinkBinary)
123 let dflags1 = dflags0{ ghcMode = mode,
126 -- leave out hscOutName for now
127 hscOutName = panic "Main.main:hscOutName not set",
128 verbosity = case cli_mode of
133 -- The rest of the arguments are "dynamic"
134 -- Leftover ones are presumably files
135 (dflags, fileish_args) <- GHC.parseDynamicFlags dflags1 argv3
137 -- make sure we clean up after ourselves
138 GHC.defaultCleanupHandler dflags $ do
140 showBanner cli_mode dflags
142 -- we've finished manipulating the DynFlags, update the session
143 GHC.setSessionDynFlags session dflags
144 dflags <- GHC.getSessionDynFlags session
147 -- To simplify the handling of filepaths, we normalise all filepaths right
148 -- away - e.g., for win32 platforms, backslashes are converted
149 -- into forward slashes.
150 normal_fileish_paths = map normalisePath fileish_args
151 (srcs, objs) = partition_args normal_fileish_paths [] []
153 -- Note: have v_Ld_inputs maintain the order in which 'objs' occurred on
155 mapM_ (consIORef v_Ld_inputs) (reverse objs)
157 ---------------- Display configuration -----------
158 when (verbosity dflags >= 4) $
161 when (verbosity dflags >= 3) $ do
162 hPutStrLn stderr ("Hsc static flags: " ++ unwords staticFlags)
164 ---------------- Final sanity checking -----------
165 checkOptions cli_mode dflags srcs objs
167 ---------------- Do the business -----------
168 let alreadyHandled = panic (show cli_mode ++
169 " should already have been handled")
171 ShowUsage -> showGhcUsage dflags cli_mode
172 PrintLibdir -> putStrLn (topDir dflags)
173 ShowSupportedLanguages -> alreadyHandled
174 ShowVersion -> alreadyHandled
175 ShowNumVersion -> alreadyHandled
176 ShowInterface f -> doShowIface dflags f
177 DoMake -> doMake session srcs
178 DoMkDependHS -> doMkDependHS session (map fst srcs)
179 StopBefore p -> oneShot dflags p srcs
180 DoInteractive -> interactiveUI session srcs Nothing
181 DoEval expr -> interactiveUI session srcs (Just expr)
183 dumpFinalStats dflags
187 interactiveUI _ _ _ =
188 throwDyn (CmdLineError "not built for interactive use")
191 -- -----------------------------------------------------------------------------
192 -- Splitting arguments into source files and object files. This is where we
193 -- interpret the -x <suffix> option, and attach a (Maybe Phase) to each source
194 -- file indicating the phase specified by the -x option in force, if any.
196 partition_args [] srcs objs = (reverse srcs, reverse objs)
197 partition_args ("-x":suff:args) srcs objs
198 | "none" <- suff = partition_args args srcs objs
199 | StopLn <- phase = partition_args args srcs (slurp ++ objs)
200 | otherwise = partition_args rest (these_srcs ++ srcs) objs
201 where phase = startPhase suff
202 (slurp,rest) = break (== "-x") args
203 these_srcs = zip slurp (repeat (Just phase))
204 partition_args (arg:args) srcs objs
205 | looks_like_an_input arg = partition_args args ((arg,Nothing):srcs) objs
206 | otherwise = partition_args args srcs (arg:objs)
209 We split out the object files (.o, .dll) and add them
210 to v_Ld_inputs for use by the linker.
212 The following things should be considered compilation manager inputs:
214 - haskell source files (strings ending in .hs, .lhs or other
215 haskellish extension),
217 - module names (not forgetting hierarchical module names),
219 - and finally we consider everything not containing a '.' to be
220 a comp manager input, as shorthand for a .hs or .lhs filename.
222 Everything else is considered to be a linker object, and passed
223 straight through to the linker.
225 looks_like_an_input m = isSourceFilename m
226 || looksLikeModuleName m
229 -- -----------------------------------------------------------------------------
230 -- Option sanity checks
232 checkOptions :: CmdLineMode -> DynFlags -> [(String,Maybe Phase)] -> [String] -> IO ()
233 -- Final sanity checking before kicking off a compilation (pipeline).
234 checkOptions cli_mode dflags srcs objs = do
235 -- Complain about any unknown flags
236 let unknown_opts = [ f | (f@('-':_), _) <- srcs ]
237 when (notNull unknown_opts) (unknownFlagsErr unknown_opts)
239 when (notNull (filter isRTSWay (wayNames dflags))
240 && isInterpretiveMode cli_mode) $
241 putStrLn ("Warning: -debug, -threaded and -ticky are ignored by GHCi")
243 -- -prof and --interactive are not a good combination
244 when (notNull (filter (not . isRTSWay) (wayNames dflags))
245 && isInterpretiveMode cli_mode) $
246 do throwDyn (UsageError
247 "--interactive can't be used with -prof or -unreg.")
249 if (isJust (outputHi dflags) &&
250 (isCompManagerMode cli_mode || srcs `lengthExceeds` 1))
251 then throwDyn (UsageError "-ohi can only be used when compiling a single source file")
254 -- -o sanity checking
255 if (srcs `lengthExceeds` 1 && isJust (outputFile dflags)
256 && not (isLinkMode cli_mode))
257 then throwDyn (UsageError "can't apply -o to multiple source files")
260 -- Check that there are some input files
261 -- (except in the interactive case)
262 if null srcs && null objs && needsInputsMode cli_mode
263 then throwDyn (UsageError "no input files")
266 -- Verify that output files point somewhere sensible.
267 verifyOutputFiles dflags
270 -- Compiler output options
272 -- called to verify that the output files & directories
273 -- point somewhere valid.
275 -- The assumption is that the directory portion of these output
276 -- options will have to exist by the time 'verifyOutputFiles'
279 verifyOutputFiles :: DynFlags -> IO ()
280 verifyOutputFiles dflags = do
281 let odir = objectDir dflags
282 when (isJust odir) $ do
283 let dir = fromJust odir
284 flg <- doesDirectoryExist dir
285 when (not flg) (nonExistentDir "-odir" dir)
286 let ofile = outputFile dflags
287 when (isJust ofile) $ do
288 let fn = fromJust ofile
289 flg <- doesDirNameExist fn
290 when (not flg) (nonExistentDir "-o" fn)
291 let ohi = outputHi dflags
292 when (isJust ohi) $ do
293 let hi = fromJust ohi
294 flg <- doesDirNameExist hi
295 when (not flg) (nonExistentDir "-ohi" hi)
297 nonExistentDir flg dir =
298 throwDyn (CmdLineError ("error: directory portion of " ++
299 show dir ++ " does not exist (used with " ++
300 show flg ++ " option.)"))
302 -----------------------------------------------------------------------------
303 -- GHC modes of operation
306 = ShowUsage -- ghc -?
307 | PrintLibdir -- ghc --print-libdir
308 | ShowInfo -- ghc --info
309 | ShowSupportedLanguages -- ghc --supported-languages
310 | ShowVersion -- ghc -V/--version
311 | ShowNumVersion -- ghc --numeric-version
312 | ShowInterface String -- ghc --show-iface
313 | DoMkDependHS -- ghc -M
314 | StopBefore Phase -- ghc -E | -C | -S
315 -- StopBefore StopLn is the default
316 | DoMake -- ghc --make
317 | DoInteractive -- ghc --interactive
318 | DoEval String -- ghc -e
321 isInteractiveMode, isInterpretiveMode :: CmdLineMode -> Bool
322 isLinkMode, isCompManagerMode :: CmdLineMode -> Bool
324 isInteractiveMode DoInteractive = True
325 isInteractiveMode _ = False
327 -- isInterpretiveMode: byte-code compiler involved
328 isInterpretiveMode DoInteractive = True
329 isInterpretiveMode (DoEval _) = True
330 isInterpretiveMode _ = False
332 needsInputsMode DoMkDependHS = True
333 needsInputsMode (StopBefore _) = True
334 needsInputsMode DoMake = True
335 needsInputsMode _ = False
337 -- True if we are going to attempt to link in this mode.
338 -- (we might not actually link, depending on the GhcLink flag)
339 isLinkMode (StopBefore StopLn) = True
340 isLinkMode DoMake = True
343 isCompManagerMode DoMake = True
344 isCompManagerMode DoInteractive = True
345 isCompManagerMode (DoEval _) = True
346 isCompManagerMode _ = False
349 -- -----------------------------------------------------------------------------
350 -- Parsing the mode flag
352 parseModeFlags :: [String] -> IO (CmdLineMode, [String])
353 parseModeFlags args = do
354 let ((leftover, errs), (mode, _, flags)) =
355 runCmdLine (processArgs mode_flags args) (StopBefore StopLn, "", [])
356 when (not (null errs)) $ do
357 throwDyn (UsageError (unlines errs))
358 return (mode, flags ++ leftover)
360 type ModeM a = CmdLineP (CmdLineMode, String, [String]) a
361 -- mode flags sometimes give rise to new DynFlags (eg. -C, see below)
362 -- so we collect the new ones and return them.
364 mode_flags :: [(String, OptKind (CmdLineP (CmdLineMode, String, [String])))]
366 [ ------- help / version ----------------------------------------------
367 ( "?" , PassFlag (setMode ShowUsage))
368 , ( "-help" , PassFlag (setMode ShowUsage))
369 , ( "-print-libdir" , PassFlag (setMode PrintLibdir))
370 , ( "V" , PassFlag (setMode ShowVersion))
371 , ( "-version" , PassFlag (setMode ShowVersion))
372 , ( "-numeric-version" , PassFlag (setMode ShowNumVersion))
373 , ( "-info" , PassFlag (setMode ShowInfo))
374 , ( "-supported-languages", PassFlag (setMode ShowSupportedLanguages))
376 ------- interfaces ----------------------------------------------------
377 , ( "-show-iface" , HasArg (\f -> setMode (ShowInterface f)
380 ------- primary modes ------------------------------------------------
381 , ( "M" , PassFlag (setMode DoMkDependHS))
382 , ( "E" , PassFlag (setMode (StopBefore anyHsc)))
383 , ( "C" , PassFlag (\f -> do setMode (StopBefore HCc) f
385 , ( "S" , PassFlag (setMode (StopBefore As)))
386 , ( "-make" , PassFlag (setMode DoMake))
387 , ( "-interactive" , PassFlag (setMode DoInteractive))
388 , ( "e" , HasArg (\s -> setMode (DoEval s) "-e"))
390 -- -fno-code says to stop after Hsc but don't generate any code.
391 , ( "fno-code" , PassFlag (\f -> do setMode (StopBefore HCc) f
393 addFlag "-no-recomp"))
396 setMode :: CmdLineMode -> String -> ModeM ()
398 (old_mode, old_flag, flags) <- getCmdLineState
399 when (notNull old_flag && flag /= old_flag) $
401 ("cannot use `" ++ old_flag ++ "' with `" ++ flag ++ "'"))
402 putCmdLineState (m, flag, flags)
404 addFlag :: String -> ModeM ()
406 (m, f, flags) <- getCmdLineState
407 putCmdLineState (m, f, s:flags)
410 -- ----------------------------------------------------------------------------
413 doMake :: Session -> [(String,Maybe Phase)] -> IO ()
414 doMake sess [] = throwDyn (UsageError "no input files")
415 doMake sess srcs = do
416 let (hs_srcs, non_hs_srcs) = partition haskellish srcs
418 haskellish (f,Nothing) =
419 looksLikeModuleName f || isHaskellSrcFilename f || '.' `notElem` f
420 haskellish (f,Just phase) =
421 phase `notElem` [As, Cc, CmmCpp, Cmm, StopLn]
423 dflags <- GHC.getSessionDynFlags sess
424 o_files <- mapM (compileFile dflags StopLn) non_hs_srcs
425 mapM_ (consIORef v_Ld_inputs) (reverse o_files)
427 targets <- mapM (uncurry GHC.guessTarget) hs_srcs
428 GHC.setTargets sess targets
429 ok_flag <- GHC.load sess LoadAllTargets
430 when (failed ok_flag) (exitWith (ExitFailure 1))
434 -- ---------------------------------------------------------------------------
437 doShowIface :: DynFlags -> FilePath -> IO ()
438 doShowIface dflags file = do
439 hsc_env <- newHscEnv dflags
440 showIface hsc_env file
442 -- ---------------------------------------------------------------------------
443 -- Various banners and verbosity output.
445 showBanner :: CmdLineMode -> DynFlags -> IO ()
446 showBanner cli_mode dflags = do
447 let verb = verbosity dflags
450 -- Show the GHCi banner
451 when (isInteractiveMode cli_mode && verb >= 1) $ putStrLn ghciWelcomeMsg
454 -- Display details of the configuration in verbose mode
456 do hPutStr stderr "Glasgow Haskell Compiler, Version "
457 hPutStr stderr cProjectVersion
458 hPutStr stderr ", for Haskell 98, stage "
459 hPutStr stderr cStage
460 hPutStr stderr " booted by GHC version "
461 hPutStrLn stderr cBooterVersion
463 -- We print out a Read-friendly string, but a prettier one than the
464 -- Show instance gives us
467 let sq x = " [" ++ x ++ "\n ]"
468 putStrLn $ sq $ concat $ intersperse "\n ," $ map show compilerInfo
471 showSupportedLanguages :: IO ()
472 showSupportedLanguages = do mapM_ putStrLn supportedLanguages
477 putStrLn (cProjectName ++ ", version " ++ cProjectVersion)
480 showGhcUsage dflags cli_mode = do
482 | DoInteractive <- cli_mode = ghciUsagePath dflags
483 | otherwise = ghcUsagePath dflags
484 usage <- readFile usage_path
489 dump ('$':'$':s) = putStr progName >> dump s
490 dump (c:s) = putChar c >> dump s
492 dumpFinalStats :: DynFlags -> IO ()
493 dumpFinalStats dflags =
494 when (dopt Opt_D_faststring_stats dflags) $ dumpFastStringStats dflags
496 dumpFastStringStats :: DynFlags -> IO ()
497 dumpFastStringStats dflags = do
498 buckets <- getFastStringTable
499 let (entries, longest, is_z, has_z) = countFS 0 0 0 0 buckets
500 msg = text "FastString stats:" $$
501 nest 4 (vcat [text "size: " <+> int (length buckets),
502 text "entries: " <+> int entries,
503 text "longest chain: " <+> int longest,
504 text "z-encoded: " <+> (is_z `pcntOf` entries),
505 text "has z-encoding: " <+> (has_z `pcntOf` entries)
507 -- we usually get more "has z-encoding" than "z-encoded", because
508 -- when we z-encode a string it might hash to the exact same string,
509 -- which will is not counted as "z-encoded". Only strings whose
510 -- Z-encoding is different from the original string are counted in
511 -- the "z-encoded" total.
514 x `pcntOf` y = int ((x * 100) `quot` y) <> char '%'
516 countFS entries longest is_z has_z [] = (entries, longest, is_z, has_z)
517 countFS entries longest is_z has_z (b:bs) =
520 longest' = max len longest
521 entries' = entries + len
522 is_zs = length (filter isZEncoded b)
523 has_zs = length (filter hasZEncoding b)
525 countFS entries' longest' (is_z + is_zs) (has_z + has_zs) bs
527 -- -----------------------------------------------------------------------------
530 unknownFlagsErr :: [String] -> a
531 unknownFlagsErr fs = throwDyn (UsageError ("unrecognised flags: " ++ unwords fs))