ghci-ng-7.6.3.1: src/Main.hs
{-# OPTIONS -fno-warn-incomplete-patterns -optc-DNON_POSIX_SOURCE #-}
-----------------------------------------------------------------------------
--
-- GHC Driver program
--
-- (c) The University of Glasgow 2005
--
-----------------------------------------------------------------------------
module Main (main) where
-- The official GHC API
import qualified GHC
import GHC ( -- DynFlags(..), HscTarget(..),
-- GhcMode(..), GhcLink(..),
Ghc, GhcMonad(..),
LoadHowMuch(..) )
import CmdLineParser
-- ghc-paths
import qualified GHC.Paths
-- Implementations of the various modes (--show-iface, mkdependHS. etc.)
import LoadIface ( showIface )
import HscMain ( newHscEnv )
import DriverPipeline ( oneShot, compileFile )
import DriverMkDepend ( doMkDependHS )
#ifdef GHCI
import InteractiveUI ( interactiveUI, ghciWelcomeMsg, defaultGhciSettings )
#endif
-- Various other random stuff that we need
import Config
import Constants
import HscTypes
import Packages ( dumpPackages )
import DriverPhases ( Phase(..), isSourceFilename, anyHsc,
startPhase, isHaskellSrcFilename )
import BasicTypes ( failed )
import StaticFlags
import StaticFlagParser
import DynFlags
import ErrUtils
import FastString
import Outputable
import SrcLoc
import Util
import Panic
import MonadUtils ( liftIO )
-- Imports for --abi-hash
import LoadIface ( loadUserInterface )
import Module ( mkModuleName )
import Finder ( findImportedModule, cannotFindInterface )
import TcRnMonad ( initIfaceCheck )
import Binary ( openBinMem, put_, fingerprintBinMem )
-- Standard Haskell libraries
import System.IO
import System.Environment
import System.Exit
import System.FilePath
import Control.Monad
import Data.Char
import Data.List
import Data.Maybe
-----------------------------------------------------------------------------
-- ToDo:
-- time commands when run with -v
-- user ways
-- Win32 support: proper signal handling
-- reading the package configuration file is too slow
-- -K<size>
-----------------------------------------------------------------------------
-- GHC's command-line interface
main :: IO ()
main = do
hSetBuffering stdout NoBuffering
hSetBuffering stderr NoBuffering
GHC.defaultErrorHandler defaultFatalMessager defaultFlushOut $ do
-- 1. extract the -B flag from the args
argv0 <- fmap (("--interactive" :) . (("-B" ++ GHC.Paths.libdir) :)) getArgs
let (minusB_args, argv1) = partition ("-B" `isPrefixOf`) argv0
mbMinusB | null minusB_args = Nothing
| otherwise = Just (drop 2 (last minusB_args))
let argv1' = map (mkGeneralLocated "on the commandline") argv1
(argv2, staticFlagWarnings) <- parseStaticFlags argv1'
-- 2. Parse the "mode" flags (--make, --interactive etc.)
(mode, argv3, modeFlagWarnings) <- parseModeFlags argv2
let flagWarnings = staticFlagWarnings ++ modeFlagWarnings
-- If all we want to do is something like showing the version number
-- then do it now, before we start a GHC session etc. This makes
-- getting basic information much more resilient.
-- In particular, if we wait until later before giving the version
-- number then bootstrapping gets confused, as it tries to find out
-- what version of GHC it's using before package.conf exists, so
-- starting the session fails.
case mode of
Left preStartupMode ->
do case preStartupMode of
ShowSupportedExtensions -> showSupportedExtensions
ShowVersion -> showVersion
ShowNumVersion -> putStrLn cProjectVersion
Print str -> putStrLn str
Right postStartupMode ->
-- start our GHC session
GHC.runGhc mbMinusB $ do
dflags <- GHC.getSessionDynFlags
case postStartupMode of
Left preLoadMode ->
liftIO $ do
case preLoadMode of
ShowInfo -> showInfo dflags
ShowGhcUsage -> showGhcUsage dflags
ShowGhciUsage -> showGhciUsage dflags
PrintWithDynFlags f -> putStrLn (f dflags)
Right postLoadMode ->
main' postLoadMode dflags argv3 flagWarnings
main' :: PostLoadMode -> DynFlags -> [Located String] -> [Located String]
-> Ghc ()
main' postLoadMode dflags0 args flagWarnings = do
-- set the default GhcMode, HscTarget and GhcLink. The HscTarget
-- can be further adjusted on a module by module basis, using only
-- the -fvia-C and -fasm flags. If the default HscTarget is not
-- HscC or HscAsm, -fvia-C and -fasm have no effect.
let dflt_target = hscTarget dflags0
(mode, lang, link)
= case postLoadMode of
DoInteractive -> (CompManager, HscInterpreted, LinkInMemory)
DoEval _ -> (CompManager, HscInterpreted, LinkInMemory)
DoMake -> (CompManager, dflt_target, LinkBinary)
DoMkDependHS -> (MkDepend, dflt_target, LinkBinary)
DoAbiHash -> (OneShot, dflt_target, LinkBinary)
_ -> (OneShot, dflt_target, LinkBinary)
let dflags1 = dflags0{ ghcMode = mode,
hscTarget = lang,
ghcLink = link,
-- leave out hscOutName for now
hscOutName = panic "Main.main:hscOutName not set",
verbosity = case postLoadMode of
DoEval _ -> 0
_other -> 1
}
-- turn on -fimplicit-import-qualified for GHCi now, so that it
-- can be overriden from the command-line
-- XXX: this should really be in the interactive DynFlags, but
-- we don't set that until later in interactiveUI
dflags1a | DoInteractive <- postLoadMode = imp_qual_enabled
| DoEval _ <- postLoadMode = imp_qual_enabled
| otherwise = dflags1
where imp_qual_enabled = dflags1 `dopt_set` Opt_ImplicitImportQualified
-- The rest of the arguments are "dynamic"
-- Leftover ones are presumably files
(dflags2, fileish_args, dynamicFlagWarnings) <- GHC.parseDynamicFlags dflags1a args
GHC.prettyPrintGhcErrors dflags2 $ do
let flagWarnings' = flagWarnings ++ dynamicFlagWarnings
handleSourceError (\e -> do
GHC.printException e
liftIO $ exitWith (ExitFailure 1)) $ do
liftIO $ handleFlagWarnings dflags2 flagWarnings'
-- make sure we clean up after ourselves
GHC.defaultCleanupHandler dflags2 $ do
liftIO $ showBanner postLoadMode dflags2
-- we've finished manipulating the DynFlags, update the session
_ <- GHC.setSessionDynFlags dflags2
dflags3 <- GHC.getSessionDynFlags
hsc_env <- GHC.getSession
let
-- To simplify the handling of filepaths, we normalise all filepaths right
-- away - e.g., for win32 platforms, backslashes are converted
-- into forward slashes.
normal_fileish_paths = map (normalise . unLoc) fileish_args
(srcs, objs) = partition_args normal_fileish_paths [] []
-- Note: have v_Ld_inputs maintain the order in which 'objs' occurred on
-- the command-line.
liftIO $ mapM_ (consIORef v_Ld_inputs) (reverse objs)
---------------- Display configuration -----------
when (verbosity dflags3 >= 4) $
liftIO $ dumpPackages dflags3
when (verbosity dflags3 >= 3) $ do
liftIO $ hPutStrLn stderr ("Hsc static flags: " ++ unwords staticFlags)
---------------- Final sanity checking -----------
liftIO $ checkOptions postLoadMode dflags3 srcs objs
---------------- Do the business -----------
handleSourceError (\e -> do
GHC.printException e
liftIO $ exitWith (ExitFailure 1)) $ do
case postLoadMode of
ShowInterface f -> liftIO $ doShowIface dflags3 f
DoMake -> doMake srcs
DoMkDependHS -> doMkDependHS (map fst srcs)
StopBefore p -> liftIO (oneShot hsc_env p srcs)
DoInteractive -> ghciUI srcs Nothing
DoEval exprs -> ghciUI srcs $ Just $ reverse exprs
DoAbiHash -> abiHash srcs
liftIO $ dumpFinalStats dflags3
ghciUI :: [(FilePath, Maybe Phase)] -> Maybe [String] -> Ghc ()
#ifndef GHCI
ghciUI _ _ = ghcError (CmdLineError "not built for interactive use")
#else
ghciUI = interactiveUI defaultGhciSettings
#endif
-- -----------------------------------------------------------------------------
-- Splitting arguments into source files and object files. This is where we
-- interpret the -x <suffix> option, and attach a (Maybe Phase) to each source
-- file indicating the phase specified by the -x option in force, if any.
partition_args :: [String] -> [(String, Maybe Phase)] -> [String]
-> ([(String, Maybe Phase)], [String])
partition_args [] srcs objs = (reverse srcs, reverse objs)
partition_args ("-x":suff:args) srcs objs
| "none" <- suff = partition_args args srcs objs
| StopLn <- phase = partition_args args srcs (slurp ++ objs)
| otherwise = partition_args rest (these_srcs ++ srcs) objs
where phase = startPhase suff
(slurp,rest) = break (== "-x") args
these_srcs = zip slurp (repeat (Just phase))
partition_args (arg:args) srcs objs
| looks_like_an_input arg = partition_args args ((arg,Nothing):srcs) objs
| otherwise = partition_args args srcs (arg:objs)
{-
We split out the object files (.o, .dll) and add them
to v_Ld_inputs for use by the linker.
The following things should be considered compilation manager inputs:
- haskell source files (strings ending in .hs, .lhs or other
haskellish extension),
- module names (not forgetting hierarchical module names),
- things beginning with '-' are flags that were not recognised by
the flag parser, and we want them to generate errors later in
checkOptions, so we class them as source files (#5921)
- and finally we consider everything not containing a '.' to be
a comp manager input, as shorthand for a .hs or .lhs filename.
Everything else is considered to be a linker object, and passed
straight through to the linker.
-}
looks_like_an_input :: String -> Bool
looks_like_an_input m = isSourceFilename m
|| looksLikeModuleName m
|| "-" `isPrefixOf` m
|| '.' `notElem` m
-- -----------------------------------------------------------------------------
-- Option sanity checks
-- | Ensure sanity of options.
--
-- Throws 'UsageError' or 'CmdLineError' if not.
checkOptions :: PostLoadMode -> DynFlags -> [(String,Maybe Phase)] -> [String] -> IO ()
-- Final sanity checking before kicking off a compilation (pipeline).
checkOptions mode dflags srcs objs = do
-- Complain about any unknown flags
let unknown_opts = [ f | (f@('-':_), _) <- srcs ]
when (notNull unknown_opts) (unknownFlagsErr unknown_opts)
when (notNull (filter isRTSWay (wayNames dflags))
&& isInterpretiveMode mode) $
hPutStrLn stderr ("Warning: -debug, -threaded and -ticky are ignored by GHCi")
-- -prof and --interactive are not a good combination
when (notNull (filter (not . isRTSWay) (wayNames dflags))
&& isInterpretiveMode mode) $
do ghcError (UsageError
"--interactive can't be used with -prof or -unreg.")
-- -ohi sanity check
if (isJust (outputHi dflags) &&
(isCompManagerMode mode || srcs `lengthExceeds` 1))
then ghcError (UsageError "-ohi can only be used when compiling a single source file")
else do
-- -o sanity checking
if (srcs `lengthExceeds` 1 && isJust (outputFile dflags)
&& not (isLinkMode mode))
then ghcError (UsageError "can't apply -o to multiple source files")
else do
let not_linking = not (isLinkMode mode) || isNoLink (ghcLink dflags)
when (not_linking && not (null objs)) $
hPutStrLn stderr ("Warning: the following files would be used as linker inputs, but linking is not being done: " ++ unwords objs)
-- Check that there are some input files
-- (except in the interactive case)
if null srcs && (null objs || not_linking) && needsInputsMode mode
then ghcError (UsageError "no input files")
else do
-- Verify that output files point somewhere sensible.
verifyOutputFiles dflags
-- Compiler output options
-- called to verify that the output files & directories
-- point somewhere valid.
--
-- The assumption is that the directory portion of these output
-- options will have to exist by the time 'verifyOutputFiles'
-- is invoked.
--
verifyOutputFiles :: DynFlags -> IO ()
verifyOutputFiles dflags = do
-- not -odir: we create the directory for -odir if it doesn't exist (#2278).
let ofile = outputFile dflags
when (isJust ofile) $ do
let fn = fromJust ofile
flg <- doesDirNameExist fn
when (not flg) (nonExistentDir "-o" fn)
let ohi = outputHi dflags
when (isJust ohi) $ do
let hi = fromJust ohi
flg <- doesDirNameExist hi
when (not flg) (nonExistentDir "-ohi" hi)
where
nonExistentDir flg dir =
ghcError (CmdLineError ("error: directory portion of " ++
show dir ++ " does not exist (used with " ++
show flg ++ " option.)"))
-----------------------------------------------------------------------------
-- GHC modes of operation
type Mode = Either PreStartupMode PostStartupMode
type PostStartupMode = Either PreLoadMode PostLoadMode
data PreStartupMode
= ShowVersion -- ghc -V/--version
| ShowNumVersion -- ghc --numeric-version
| ShowSupportedExtensions -- ghc --supported-extensions
| Print String -- ghc --print-foo
showVersionMode, showNumVersionMode, showSupportedExtensionsMode :: Mode
showVersionMode = mkPreStartupMode ShowVersion
showNumVersionMode = mkPreStartupMode ShowNumVersion
showSupportedExtensionsMode = mkPreStartupMode ShowSupportedExtensions
mkPreStartupMode :: PreStartupMode -> Mode
mkPreStartupMode = Left
isShowVersionMode :: Mode -> Bool
isShowVersionMode (Left ShowVersion) = True
isShowVersionMode _ = False
isShowNumVersionMode :: Mode -> Bool
isShowNumVersionMode (Left ShowNumVersion) = True
isShowNumVersionMode _ = False
data PreLoadMode
= ShowGhcUsage -- ghc -?
| ShowGhciUsage -- ghci -?
| ShowInfo -- ghc --info
| PrintWithDynFlags (DynFlags -> String) -- ghc --print-foo
showGhcUsageMode, showGhciUsageMode, showInfoMode :: Mode
showGhcUsageMode = mkPreLoadMode ShowGhcUsage
showGhciUsageMode = mkPreLoadMode ShowGhciUsage
showInfoMode = mkPreLoadMode ShowInfo
printSetting :: String -> Mode
printSetting k = mkPreLoadMode (PrintWithDynFlags f)
where f dflags = fromMaybe (panic ("Setting not found: " ++ show k))
$ lookup k (compilerInfo dflags)
mkPreLoadMode :: PreLoadMode -> Mode
mkPreLoadMode = Right . Left
isShowGhcUsageMode :: Mode -> Bool
isShowGhcUsageMode (Right (Left ShowGhcUsage)) = True
isShowGhcUsageMode _ = False
isShowGhciUsageMode :: Mode -> Bool
isShowGhciUsageMode (Right (Left ShowGhciUsage)) = True
isShowGhciUsageMode _ = False
data PostLoadMode
= ShowInterface FilePath -- ghc --show-iface
| DoMkDependHS -- ghc -M
| StopBefore Phase -- ghc -E | -C | -S
-- StopBefore StopLn is the default
| DoMake -- ghc --make
| DoInteractive -- ghc --interactive
| DoEval [String] -- ghc -e foo -e bar => DoEval ["bar", "foo"]
| DoAbiHash -- ghc --abi-hash
doMkDependHSMode, doMakeMode, doInteractiveMode, doAbiHashMode :: Mode
doMkDependHSMode = mkPostLoadMode DoMkDependHS
doMakeMode = mkPostLoadMode DoMake
doInteractiveMode = mkPostLoadMode DoInteractive
doAbiHashMode = mkPostLoadMode DoAbiHash
showInterfaceMode :: FilePath -> Mode
showInterfaceMode fp = mkPostLoadMode (ShowInterface fp)
stopBeforeMode :: Phase -> Mode
stopBeforeMode phase = mkPostLoadMode (StopBefore phase)
doEvalMode :: String -> Mode
doEvalMode str = mkPostLoadMode (DoEval [str])
mkPostLoadMode :: PostLoadMode -> Mode
mkPostLoadMode = Right . Right
isDoInteractiveMode :: Mode -> Bool
isDoInteractiveMode (Right (Right DoInteractive)) = True
isDoInteractiveMode _ = False
isStopLnMode :: Mode -> Bool
isStopLnMode (Right (Right (StopBefore StopLn))) = True
isStopLnMode _ = False
isDoMakeMode :: Mode -> Bool
isDoMakeMode (Right (Right DoMake)) = True
isDoMakeMode _ = False
#ifdef GHCI
isInteractiveMode :: PostLoadMode -> Bool
isInteractiveMode DoInteractive = True
isInteractiveMode _ = False
#endif
-- isInterpretiveMode: byte-code compiler involved
isInterpretiveMode :: PostLoadMode -> Bool
isInterpretiveMode DoInteractive = True
isInterpretiveMode (DoEval _) = True
isInterpretiveMode _ = False
needsInputsMode :: PostLoadMode -> Bool
needsInputsMode DoMkDependHS = True
needsInputsMode (StopBefore _) = True
needsInputsMode DoMake = True
needsInputsMode _ = False
-- True if we are going to attempt to link in this mode.
-- (we might not actually link, depending on the GhcLink flag)
isLinkMode :: PostLoadMode -> Bool
isLinkMode (StopBefore StopLn) = True
isLinkMode DoMake = True
isLinkMode DoInteractive = True
isLinkMode (DoEval _) = True
isLinkMode _ = False
isCompManagerMode :: PostLoadMode -> Bool
isCompManagerMode DoMake = True
isCompManagerMode DoInteractive = True
isCompManagerMode (DoEval _) = True
isCompManagerMode _ = False
-- -----------------------------------------------------------------------------
-- Parsing the mode flag
parseModeFlags :: [Located String]
-> IO (Mode,
[Located String],
[Located String])
parseModeFlags args = do
let ((leftover, errs1, warns), (mModeFlag, errs2, flags')) =
runCmdLine (processArgs mode_flags args)
(Nothing, [], [])
mode = case mModeFlag of
Nothing -> doMakeMode
Just (m, _) -> m
errs = errs1 ++ map (mkGeneralLocated "on the commandline") errs2
when (not (null errs)) $ ghcError $ errorsToGhcException errs
return (mode, flags' ++ leftover, warns)
type ModeM = CmdLineP (Maybe (Mode, String), [String], [Located String])
-- mode flags sometimes give rise to new DynFlags (eg. -C, see below)
-- so we collect the new ones and return them.
mode_flags :: [Flag ModeM]
mode_flags =
[ ------- help / version ----------------------------------------------
Flag "?" (PassFlag (setMode showGhcUsageMode))
, Flag "-help" (PassFlag (setMode showGhcUsageMode))
, Flag "V" (PassFlag (setMode showVersionMode))
, Flag "-version" (PassFlag (setMode showVersionMode))
, Flag "-numeric-version" (PassFlag (setMode showNumVersionMode))
, Flag "-info" (PassFlag (setMode showInfoMode))
, Flag "-supported-languages" (PassFlag (setMode showSupportedExtensionsMode))
, Flag "-supported-extensions" (PassFlag (setMode showSupportedExtensionsMode))
] ++
[ Flag k' (PassFlag (setMode (printSetting k)))
| k <- ["Project version",
"Booter version",
"Stage",
"Build platform",
"Host platform",
"Target platform",
"Have interpreter",
"Object splitting supported",
"Have native code generator",
"Support SMP",
"Unregisterised",
"Tables next to code",
"RTS ways",
"Leading underscore",
"Debug on",
"LibDir",
"Global Package DB",
"C compiler flags",
"Gcc Linker flags",
"Ld Linker flags"],
let k' = "-print-" ++ map (replaceSpace . toLower) k
replaceSpace ' ' = '-'
replaceSpace c = c
] ++
------- interfaces ----------------------------------------------------
[ Flag "-show-iface" (HasArg (\f -> setMode (showInterfaceMode f)
"--show-iface"))
------- primary modes ------------------------------------------------
, Flag "c" (PassFlag (\f -> do setMode (stopBeforeMode StopLn) f
addFlag "-no-link" f))
, Flag "M" (PassFlag (setMode doMkDependHSMode))
, Flag "E" (PassFlag (setMode (stopBeforeMode anyHsc)))
, Flag "C" (PassFlag setGenerateC)
, Flag "S" (PassFlag (setMode (stopBeforeMode As)))
, Flag "-make" (PassFlag (setMode doMakeMode))
, Flag "-interactive" (PassFlag (setMode doInteractiveMode))
, Flag "-abi-hash" (PassFlag (setMode doAbiHashMode))
, Flag "e" (SepArg (\s -> setMode (doEvalMode s) "-e"))
]
setGenerateC :: String -> EwM ModeM ()
setGenerateC f
| cGhcUnregisterised /= "YES" = do
addWarn ("Compiler not unregisterised, so ignoring " ++ f)
| otherwise = do
setMode (stopBeforeMode HCc) f
addFlag "-fvia-C" f
setMode :: Mode -> String -> EwM ModeM ()
setMode newMode newFlag = liftEwM $ do
(mModeFlag, errs, flags') <- getCmdLineState
let (modeFlag', errs') =
case mModeFlag of
Nothing -> ((newMode, newFlag), errs)
Just (oldMode, oldFlag) ->
case (oldMode, newMode) of
-- -c/--make are allowed together, and mean --make -no-link
_ | isStopLnMode oldMode && isDoMakeMode newMode
|| isStopLnMode newMode && isDoMakeMode oldMode ->
((doMakeMode, "--make"), [])
-- If we have both --help and --interactive then we
-- want showGhciUsage
_ | isShowGhcUsageMode oldMode &&
isDoInteractiveMode newMode ->
((showGhciUsageMode, oldFlag), [])
| isShowGhcUsageMode newMode &&
isDoInteractiveMode oldMode ->
((showGhciUsageMode, newFlag), [])
-- Otherwise, --help/--version/--numeric-version always win
| isDominantFlag oldMode -> ((oldMode, oldFlag), [])
| isDominantFlag newMode -> ((newMode, newFlag), [])
-- We need to accumulate eval flags like "-e foo -e bar"
(Right (Right (DoEval esOld)),
Right (Right (DoEval [eNew]))) ->
((Right (Right (DoEval (eNew : esOld))), oldFlag),
errs)
-- Saying e.g. --interactive --interactive is OK
_ | oldFlag == newFlag -> ((oldMode, oldFlag), errs)
-- Otherwise, complain
_ -> let err = flagMismatchErr oldFlag newFlag
in ((oldMode, oldFlag), err : errs)
putCmdLineState (Just modeFlag', errs', flags')
where isDominantFlag f = isShowGhcUsageMode f ||
isShowGhciUsageMode f ||
isShowVersionMode f ||
isShowNumVersionMode f
flagMismatchErr :: String -> String -> String
flagMismatchErr oldFlag newFlag
= "cannot use `" ++ oldFlag ++ "' with `" ++ newFlag ++ "'"
addFlag :: String -> String -> EwM ModeM ()
addFlag s flag = liftEwM $ do
(m, e, flags') <- getCmdLineState
putCmdLineState (m, e, mkGeneralLocated loc s : flags')
where loc = "addFlag by " ++ flag ++ " on the commandline"
-- ----------------------------------------------------------------------------
-- Run --make mode
doMake :: [(String,Maybe Phase)] -> Ghc ()
doMake srcs = do
let (hs_srcs, non_hs_srcs) = partition haskellish srcs
haskellish (f,Nothing) =
looksLikeModuleName f || isHaskellSrcFilename f || '.' `notElem` f
haskellish (_,Just phase) =
phase `notElem` [As, Cc, Cobjc, Cobjcpp, CmmCpp, Cmm, StopLn]
hsc_env <- GHC.getSession
-- if we have no haskell sources from which to do a dependency
-- analysis, then just do one-shot compilation and/or linking.
-- This means that "ghc Foo.o Bar.o -o baz" links the program as
-- we expect.
if (null hs_srcs)
then liftIO (oneShot hsc_env StopLn srcs)
else do
o_files <- mapM (\x -> liftIO $ compileFile hsc_env StopLn x)
non_hs_srcs
liftIO $ mapM_ (consIORef v_Ld_inputs) (reverse o_files)
targets <- mapM (uncurry GHC.guessTarget) hs_srcs
GHC.setTargets targets
ok_flag <- GHC.load LoadAllTargets
when (failed ok_flag) (liftIO $ exitWith (ExitFailure 1))
return ()
-- ---------------------------------------------------------------------------
-- --show-iface mode
doShowIface :: DynFlags -> FilePath -> IO ()
doShowIface dflags file = do
hsc_env <- newHscEnv dflags
showIface hsc_env file
-- ---------------------------------------------------------------------------
-- Various banners and verbosity output.
showBanner :: PostLoadMode -> DynFlags -> IO ()
showBanner _postLoadMode dflags = do
let verb = verbosity dflags
#ifdef GHCI
-- Show the GHCi banner
when (isInteractiveMode _postLoadMode && verb >= 1) $ putStrLn ghciWelcomeMsg
#endif
-- Display details of the configuration in verbose mode
when (verb >= 2) $
do hPutStr stderr "Glasgow Haskell Compiler, Version "
hPutStr stderr cProjectVersion
hPutStr stderr ", stage "
hPutStr stderr cStage
hPutStr stderr " booted by GHC version "
hPutStrLn stderr cBooterVersion
-- We print out a Read-friendly string, but a prettier one than the
-- Show instance gives us
showInfo :: DynFlags -> IO ()
showInfo dflags = do
let sq x = " [" ++ x ++ "\n ]"
putStrLn $ sq $ intercalate "\n ," $ map show $ compilerInfo dflags
showSupportedExtensions :: IO ()
showSupportedExtensions = mapM_ putStrLn supportedLanguagesAndExtensions
showVersion :: IO ()
showVersion = putStrLn (cProjectName ++ ", version " ++ cProjectVersion)
showGhcUsage :: DynFlags -> IO ()
showGhcUsage = showUsage False
showGhciUsage :: DynFlags -> IO ()
showGhciUsage = showUsage True
showUsage :: Bool -> DynFlags -> IO ()
showUsage ghci dflags = do
let usage_path = if ghci then ghciUsagePath dflags
else ghcUsagePath dflags
usage <- readFile usage_path
dump usage
where
dump "" = return ()
dump ('$':'$':s) = putStr progName >> dump s
dump (c:s) = putChar c >> dump s
dumpFinalStats :: DynFlags -> IO ()
dumpFinalStats dflags =
when (dopt Opt_D_faststring_stats dflags) $ dumpFastStringStats dflags
dumpFastStringStats :: DynFlags -> IO ()
dumpFastStringStats dflags = do
buckets <- getFastStringTable
let (entries, longest, is_z, has_z) = countFS 0 0 0 0 buckets
msg = text "FastString stats:" $$
nest 4 (vcat [text "size: " <+> int (length buckets),
text "entries: " <+> int entries,
text "longest chain: " <+> int longest,
text "z-encoded: " <+> (is_z `pcntOf` entries),
text "has z-encoding: " <+> (has_z `pcntOf` entries)
])
-- we usually get more "has z-encoding" than "z-encoded", because
-- when we z-encode a string it might hash to the exact same string,
-- which will is not counted as "z-encoded". Only strings whose
-- Z-encoding is different from the original string are counted in
-- the "z-encoded" total.
putMsg dflags msg
where
x `pcntOf` y = int ((x * 100) `quot` y) <> char '%'
countFS :: Int -> Int -> Int -> Int -> [[FastString]] -> (Int, Int, Int, Int)
countFS entries longest is_z has_z [] = (entries, longest, is_z, has_z)
countFS entries longest is_z has_z (b:bs) =
let
len = length b
longest' = max len longest
entries' = entries + len
is_zs = length (filter isZEncoded b)
has_zs = length (filter hasZEncoding b)
in
countFS entries' longest' (is_z + is_zs) (has_z + has_zs) bs
-- -----------------------------------------------------------------------------
-- ABI hash support
{-
ghc --abi-hash Data.Foo System.Bar
Generates a combined hash of the ABI for modules Data.Foo and
System.Bar. The modules must already be compiled, and appropriate -i
options may be necessary in order to find the .hi files.
This is used by Cabal for generating the InstalledPackageId for a
package. The InstalledPackageId must change when the visible ABI of
the package chagnes, so during registration Cabal calls ghc --abi-hash
to get a hash of the package's ABI.
-}
abiHash :: [(String, Maybe Phase)] -> Ghc ()
abiHash strs = do
hsc_env <- getSession
let dflags = hsc_dflags hsc_env
liftIO $ do
let find_it str = do
let modname = mkModuleName str
r <- findImportedModule hsc_env modname Nothing
case r of
Found _ m -> return m
_error -> ghcError $ CmdLineError $ showSDoc dflags $
cannotFindInterface dflags modname r
mods <- mapM find_it (map fst strs)
let get_iface modl = loadUserInterface False (text "abiHash") modl
ifaces <- initIfaceCheck hsc_env $ mapM get_iface mods
bh <- openBinMem (3*1024) -- just less than a block
put_ bh hiVersion
-- package hashes change when the compiler version changes (for now)
-- see #5328
mapM_ (put_ bh . mi_mod_hash) ifaces
f <- fingerprintBinMem bh
putStrLn (showPpr dflags f)
-- -----------------------------------------------------------------------------
-- Util
unknownFlagsErr :: [String] -> a
unknownFlagsErr fs = ghcError (UsageError ("unrecognised flags: " ++ unwords fs))