X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fmain%2FMain.hs;h=ec5a116894830d0149712c225b5e5ef6cf394bcf;hb=28a464a75e14cece5db40f2765a29348273ff2d2;hp=2c13c628663abd48feae5ad6b683c80f5c2437b0;hpb=ef5b4b146aa172d8ac10f39b5eb3d7a0f948d8f1;p=ghc-hetmet.git diff --git a/ghc/compiler/main/Main.hs b/ghc/compiler/main/Main.hs index 2c13c62..ec5a116 100644 --- a/ghc/compiler/main/Main.hs +++ b/ghc/compiler/main/Main.hs @@ -1,60 +1,49 @@ {-# OPTIONS -fno-warn-incomplete-patterns -optc-DNON_POSIX_SOURCE #-} - ----------------------------------------------------------------------------- --- $Id: Main.hs,v 1.141 2004/11/26 16:21:00 simonmar Exp $ -- -- GHC Driver program -- --- (c) The University of Glasgow 2002 +-- (c) The University of Glasgow 2005 -- ----------------------------------------------------------------------------- --- with path so that ghc -M can find config.h -#include "../includes/ghcconfig.h" - module Main (main) where #include "HsVersions.h" - +-- The official GHC API +import qualified GHC +import GHC ( Session, DynFlags(..), GhcMode(..), HscTarget(..), + LoadHowMuch(..), dopt, DynFlag(..) ) +import CmdLineParser + +-- Implementations of the various modes (--show-iface, mkdependHS. etc.) +import MkIface ( showIface ) +import DriverPipeline ( oneShot, compileFile ) +import DriverMkDepend ( doMkDependHS ) +import SysTools ( getTopDir, getUsageMsgPaths ) #ifdef GHCI -import InteractiveUI( ghciWelcomeMsg, interactiveUI ) +import InteractiveUI ( ghciWelcomeMsg, interactiveUI ) #endif - -import CompManager ( cmInit, cmLoadModules, cmDepAnal ) -import HscTypes ( GhciMode(..) ) -import Config ( cBooterVersion, cGhcUnregisterised, cProjectVersion ) -import SysTools ( initSysTools, cleanTempFiles, normalisePath ) -import Packages ( dumpPackages, initPackages, haskell98PackageId ) -import DriverPipeline ( staticLink, doMkDLL, runPipeline ) -import DriverState ( buildStgToDo, - findBuildTag, unregFlags, - v_GhcMode, v_GhcModeFlag, GhcMode(..), - v_Keep_tmp_files, v_Ld_inputs, v_Ways, - v_Output_file, v_Output_hi, - verifyOutputFiles, v_NoLink - ) -import DriverFlags - -import DriverMkDepend ( beginMkDependHS, endMkDependHS ) -import DriverPhases ( isSourceFilename ) - -import DriverUtil ( add, handle, handleDyn, later, unknownFlagsErr ) -import CmdLineOpts ( DynFlags(..), HscLang(..), v_Static_hsc_opts, - defaultDynFlags ) +-- Various other random stuff that we need +import Config ( cProjectVersion, cBooterVersion, cProjectName ) +import Packages ( dumpPackages, initPackages ) +import DriverPhases ( Phase(..), isSourceFilename, anyHsc, + startPhase, isHaskellSrcFilename ) +import StaticFlags ( staticFlags, v_Ld_inputs, parseStaticFlags ) +import DynFlags ( defaultDynFlags ) import BasicTypes ( failed ) +import ErrUtils ( Message, debugTraceMsg, putMsg ) +import FastString ( getFastStringTable, isZEncoded, hasZEncoding ) import Outputable import Util -import Panic ( GhcException(..), panic, installSignalHandlers ) - -import DATA_IOREF ( readIORef, writeIORef ) -import EXCEPTION ( throwDyn, Exception(..), - AsyncException(StackOverflow) ) +import Panic -- Standard Haskell libraries +import EXCEPTION ( throwDyn ) import IO -import Directory ( doesFileExist ) +import Directory ( doesDirectoryExist ) import System ( getArgs, exitWith, ExitCode(..) ) import Monad import List @@ -63,120 +52,130 @@ import Maybe ----------------------------------------------------------------------------- -- ToDo: --- new mkdependHS doesn't support all the options that the old one did (-X et al.) -- time commands when run with -v --- split marker --- java generation -- user ways -- Win32 support: proper signal handling --- make sure OPTIONS in .hs file propogate to .hc file if -C or -keep-hc-file-too -- reading the package configuration file is too slow -- -K ----------------------------------------------------------------------------- --- Differences vs. old driver: - --- No more "Enter your Haskell program, end with ^D (on a line of its own):" --- consistency checking removed (may do this properly later) --- no -Ofile - ------------------------------------------------------------------------------ --- Main loop +-- GHC's command-line interface main = - -- top-level exception handler: any unrecognised exception is a compiler bug. - handle (\exception -> do - hFlush stdout - case exception of - -- an IO exception probably isn't our fault, so don't panic - IOException _ -> hPutStrLn stderr (show exception) - AsyncException StackOverflow -> - hPutStrLn stderr "stack overflow: use +RTS -K to increase it" - _other -> hPutStr stderr (show (Panic (show exception))) - exitWith (ExitFailure 1) - ) $ do - - -- all error messages are propagated as exceptions - handleDyn (\dyn -> do - hFlush stdout - case dyn of - PhaseFailed _ code -> exitWith code - Interrupted -> exitWith (ExitFailure 1) - _ -> do hPutStrLn stderr (show (dyn :: GhcException)) - exitWith (ExitFailure 1) - ) $ do - - installSignalHandlers - - argv <- getArgs - let (minusB_args, argv') = partition (prefixMatch "-B") argv - top_dir <- initSysTools minusB_args - - -- Process all the other arguments, and get the source files - non_static <- processStaticFlags argv' - mode <- readIORef v_GhcMode - - -- -O and --interactive are not a good combination - -- ditto with any kind of way selection - orig_ways <- readIORef v_Ways - when (notNull orig_ways && isInteractive mode) $ - do throwDyn (UsageError - "--interactive can't be used with -prof, -ticky, -unreg or -smp.") - - -- Find the build tag, and re-process the build-specific options. - -- Also add in flags for unregisterised compilation, if - -- GhcUnregisterised=YES. - way_opts <- findBuildTag - let unreg_opts | cGhcUnregisterised == "YES" = unregFlags - | otherwise = [] - extra_non_static <- processStaticFlags (unreg_opts ++ way_opts) - - -- Give the static flags to hsc - static_opts <- buildStaticHscOpts - writeIORef v_Static_hsc_opts static_opts - - -- build the default DynFlags (these may be adjusted on a per - -- module basis by OPTIONS pragmas and settings in the interpreter). - - stg_todo <- buildStgToDo - - -- set the "global" HscLang. The HscLang can be further adjusted on a module - -- by module basis, using only the -fvia-C and -fasm flags. If the global - -- HscLang is not HscC or HscAsm, -fvia-C and -fasm have no effect. - let dflags0 = defaultDynFlags - let lang = case mode of + GHC.defaultErrorHandler defaultDynFlags $ do + + argv0 <- getArgs + argv1 <- parseStaticFlags =<< GHC.initFromArgs argv0 + + -- 2. Parse the "mode" flags (--make, --interactive etc.) + (cli_mode, argv2) <- parseModeFlags argv1 + + let mode = case cli_mode of + DoInteractive -> Interactive + DoEval _ -> Interactive + DoMake -> BatchCompile + DoMkDependHS -> MkDepend + _ -> OneShot + + -- start our GHC session + session <- GHC.newSession mode + + dflags0 <- GHC.getSessionDynFlags session + + -- set the default HscTarget. 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 lang = case cli_mode of DoInteractive -> HscInterpreted DoEval _ -> HscInterpreted - _other -> hscLang dflags0 + _other -> hscTarget dflags0 - let dflags1 = dflags0{ stgToDo = stg_todo, - hscLang = lang, - -- leave out hscOutName for now - hscOutName = panic "Main.main:hscOutName not set", - verbosity = case mode of + let dflags1 = dflags0{ ghcMode = mode, + hscTarget = lang, + -- leave out hscOutName for now + hscOutName = panic "Main.main:hscOutName not set", + verbosity = case cli_mode of DoEval _ -> 0 _other -> 1 } -- The rest of the arguments are "dynamic" -- Leftover ones are presumably files - (dflags2, fileish_args) <- processDynamicFlags - (extra_non_static ++ non_static) dflags1 + (dflags2, fileish_args) <- GHC.parseDynamicFlags dflags1 argv2 -- make sure we clean up after ourselves - later (do forget_it <- readIORef v_Keep_tmp_files - unless forget_it $ do - cleanTempFiles dflags2 - ) $ do - -- exceptions will be blocked while we clean the temporary files, - -- so there shouldn't be any difficulty if we receive further - -- signals. + GHC.defaultCleanupHandler dflags2 $ do + + -- Display banner + showBanner cli_mode dflags2 -- Read the package config(s), and process the package-related -- command-line flags - dflags <- initPackages dflags2 + dflags <- initPackages dflags2 + + -- we've finished manipulating the DynFlags, update the session + GHC.setSessionDynFlags session dflags + + 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 normalisePath 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. + mapM_ (consIORef v_Ld_inputs) (reverse objs) + + ---------------- Display configuration ----------- + when (verbosity dflags >= 4) $ + dumpPackages dflags + + when (verbosity dflags >= 3) $ do + hPutStrLn stderr ("Hsc static flags: " ++ unwords staticFlags) + + ---------------- Final sanity checking ----------- + checkOptions cli_mode dflags srcs objs + + ---------------- Do the business ----------- + case cli_mode of + ShowUsage -> showGhcUsage cli_mode + PrintLibdir -> do d <- getTopDir; putStrLn d + ShowVersion -> showVersion + ShowNumVersion -> putStrLn cProjectVersion + ShowInterface f -> showIface f + DoMake -> doMake session srcs + DoMkDependHS -> doMkDependHS session (map fst srcs) + StopBefore p -> oneShot dflags p srcs + DoInteractive -> interactiveUI session srcs Nothing + DoEval expr -> interactiveUI session srcs (Just expr) + + dumpFinalStats dflags + exitWith ExitSuccess + +#ifndef GHCI +interactiveUI _ _ _ = + throwDyn (CmdLineError "not built for interactive use") +#endif + +-- ----------------------------------------------------------------------------- +-- Splitting arguments into source files and object files. This is where we +-- interpret the -x option, and attach a (Maybe Phase) to each source +-- file indicating the phase specified by the -x option in force, if any. + +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) - let {- We split out the object files (.o, .dll) and add them to v_Ld_inputs for use by the linker. @@ -194,156 +193,284 @@ main = Everything else is considered to be a linker object, and passed straight through to the linker. -} - looks_like_an_input m = isSourceFilename m - || looksLikeModuleName m - || '.' `notElem` m - - -- 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 normalisePath fileish_args - (srcs, objs) = partition looks_like_an_input normal_fileish_paths - - -- Note: have v_Ld_inputs maintain the order in which 'objs' occurred on - -- the command-line. - mapM_ (add v_Ld_inputs) (reverse objs) - - ---------------- Display banners and configuration ----------- - showBanners mode dflags static_opts - - ---------------- Final sanity checking ----------- - checkOptions mode srcs objs - - ---------------- Do the business ----------- - - -- Always link in the haskell98 package for static linking. Other - -- packages have to be specified via the -package flag. - let link_pkgs - | Just h98_id <- haskell98PackageId (pkgState dflags) = [h98_id] - | otherwise = [] - - case mode of - DoMake -> doMake dflags srcs - - DoMkDependHS -> do { beginMkDependHS ; - compileFiles mode dflags srcs; - endMkDependHS dflags } - StopBefore p -> do { compileFiles mode dflags srcs; return () } - DoMkDLL -> do { o_files <- compileFiles mode dflags srcs; - doMkDLL dflags o_files link_pkgs } - DoLink -> do { o_files <- compileFiles mode dflags srcs; - omit_linking <- readIORef v_NoLink; - when (not omit_linking) - (staticLink dflags o_files link_pkgs) } - -#ifndef GHCI - DoInteractive -> noInteractiveError - DoEval _ -> noInteractiveError - where - noInteractiveError = throwDyn (CmdLineError "not built for interactive use") -#else - DoInteractive -> interactiveUI dflags srcs Nothing - DoEval expr -> interactiveUI dflags srcs (Just expr) -#endif +looks_like_an_input m = isSourceFilename m + || looksLikeModuleName m + || '.' `notElem` m -- ----------------------------------------------------------------------------- -- Option sanity checks -checkOptions :: GhcMode -> [String] -> [String] -> IO () +checkOptions :: CmdLineMode -> DynFlags -> [(String,Maybe Phase)] -> [String] -> IO () -- Final sanity checking before kicking off a compilation (pipeline). -checkOptions mode srcs objs = do +checkOptions cli_mode dflags srcs objs = do -- Complain about any unknown flags - let unknown_opts = [ f | f@('-':_) <- srcs ] + let unknown_opts = [ f | (f@('-':_), _) <- srcs ] when (notNull unknown_opts) (unknownFlagsErr unknown_opts) + -- -prof and --interactive are not a good combination + when (notNull (wayNames dflags) && isInterpretiveMode cli_mode) $ + do throwDyn (UsageError + "--interactive can't be used with -prof, -ticky, -unreg or -smp.") -- -ohi sanity check - ohi <- readIORef v_Output_hi - if (isJust ohi && - (mode == DoMake || isInteractive mode || srcs `lengthExceeds` 1)) + if (isJust (outputHi dflags) && + (isCompManagerMode cli_mode || srcs `lengthExceeds` 1)) then throwDyn (UsageError "-ohi can only be used when compiling a single source file") else do -- -o sanity checking - o_file <- readIORef v_Output_file - if (srcs `lengthExceeds` 1 && isJust o_file && mode /= DoLink && mode /= DoMkDLL) + if (srcs `lengthExceeds` 1 && isJust (outputFile dflags) + && not (isLinkMode cli_mode)) then throwDyn (UsageError "can't apply -o to multiple source files") else do - -- Check that there are some input files (except in the interactive - -- case) - if null srcs && null objs && not (isInteractive mode) + -- Check that there are some input files + -- (except in the interactive case) + if null srcs && null objs && needsInputsMode cli_mode then throwDyn (UsageError "no input files") else do -- Verify that output files point somewhere sensible. - verifyOutputFiles + verifyOutputFiles dflags -isInteractive DoInteractive = True -isInteractive (DoEval _) = True -isInteractive _ = False --- ----------------------------------------------------------------------------- --- Compile files in one-shot mode. +-- Compiler output options -compileFiles :: GhcMode - -> DynFlags - -> [String] -- Source files - -> IO [String] -- Object files -compileFiles mode dflags srcs = do - stop_flag <- readIORef v_GhcModeFlag - mapM (compileFile mode dflags stop_flag) srcs +-- 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 + let odir = objectDir dflags + when (isJust odir) $ do + let dir = fromJust odir + flg <- doesDirectoryExist dir + when (not flg) (nonExistentDir "-odir" dir) + 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 = + throwDyn (CmdLineError ("error: directory portion of " ++ + show dir ++ " does not exist (used with " ++ + show flg ++ " option.)")) +----------------------------------------------------------------------------- +-- GHC modes of operation + +data CmdLineMode + = ShowUsage -- ghc -? + | PrintLibdir -- ghc --print-libdir + | ShowVersion -- ghc -V/--version + | ShowNumVersion -- ghc --numeric-version + | ShowInterface String -- 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 + deriving (Show) + +isInteractiveMode, isInterpretiveMode :: CmdLineMode -> Bool +isLinkMode, isCompManagerMode :: CmdLineMode -> Bool + +isInteractiveMode DoInteractive = True +isInteractiveMode _ = False + +-- isInterpretiveMode: byte-code compiler involved +isInterpretiveMode DoInteractive = True +isInterpretiveMode (DoEval _) = True +isInterpretiveMode _ = False + +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 (StopBefore StopLn) = True +isLinkMode DoMake = True +isLinkMode _ = False + +isCompManagerMode DoMake = True +isCompManagerMode DoInteractive = True +isCompManagerMode (DoEval _) = True +isCompManagerMode _ = False -compileFile mode dflags stop_flag src = do - exists <- doesFileExist src - when (not exists) $ - throwDyn (CmdLineError ("file `" ++ src ++ "' does not exist")) - - o_file <- readIORef v_Output_file - -- when linking, the -o argument refers to the linker's output. - -- otherwise, we use it as the name for the pipeline's output. - let maybe_o_file - | mode==DoLink || mode==DoMkDLL = Nothing - | otherwise = o_file - runPipeline mode dflags stop_flag True maybe_o_file src - Nothing{-no ModLocation-} +-- ----------------------------------------------------------------------------- +-- Parsing the mode flag + +parseModeFlags :: [String] -> IO (CmdLineMode, [String]) +parseModeFlags args = do + let ((leftover, errs), (mode, _, flags)) = + runCmdLine (processArgs mode_flags args) (StopBefore StopLn, "", []) + when (not (null errs)) $ do + throwDyn (UsageError (unlines errs)) + return (mode, flags ++ leftover) + +type ModeM a = CmdLineP (CmdLineMode, String, [String]) a + -- mode flags sometimes give rise to new DynFlags (eg. -C, see below) + -- so we collect the new ones and return them. + +mode_flags :: [(String, OptKind (CmdLineP (CmdLineMode, String, [String])))] +mode_flags = + [ ------- help / version ---------------------------------------------- + ( "?" , PassFlag (setMode ShowUsage)) + , ( "-help" , PassFlag (setMode ShowUsage)) + , ( "-print-libdir" , PassFlag (setMode PrintLibdir)) + , ( "V" , PassFlag (setMode ShowVersion)) + , ( "-version" , PassFlag (setMode ShowVersion)) + , ( "-numeric-version", PassFlag (setMode ShowNumVersion)) + + ------- interfaces ---------------------------------------------------- + , ( "-show-iface" , HasArg (\f -> setMode (ShowInterface f) + "--show-iface")) + + ------- primary modes ------------------------------------------------ + , ( "M" , PassFlag (setMode DoMkDependHS)) + , ( "E" , PassFlag (setMode (StopBefore anyHsc))) + , ( "C" , PassFlag (\f -> do setMode (StopBefore HCc) f + addFlag "-fvia-C")) + , ( "S" , PassFlag (setMode (StopBefore As))) + , ( "-make" , PassFlag (setMode DoMake)) + , ( "-interactive" , PassFlag (setMode DoInteractive)) + , ( "e" , HasArg (\s -> setMode (DoEval s) "-e")) + + -- -fno-code says to stop after Hsc but don't generate any code. + , ( "fno-code" , PassFlag (\f -> do setMode (StopBefore HCc) f + addFlag "-fno-code" + addFlag "-no-recomp")) + ] + +setMode :: CmdLineMode -> String -> ModeM () +setMode m flag = do + (old_mode, old_flag, flags) <- getCmdLineState + when (notNull old_flag && flag /= old_flag) $ + throwDyn (UsageError + ("cannot use `" ++ old_flag ++ "' with `" ++ flag ++ "'")) + putCmdLineState (m, flag, flags) + +addFlag :: String -> ModeM () +addFlag s = do + (m, f, flags) <- getCmdLineState + putCmdLineState (m, f, s:flags) -- ---------------------------------------------------------------------------- -- Run --make mode -doMake :: DynFlags -> [String] -> IO () -doMake dflags [] = throwDyn (UsageError "no input files") -doMake dflags srcs = do - state <- cmInit Batch dflags - graph <- cmDepAnal state srcs - (_, ok_flag, _) <- cmLoadModules state graph +doMake :: Session -> [(String,Maybe Phase)] -> IO () +doMake sess [] = throwDyn (UsageError "no input files") +doMake sess srcs = do + let (hs_srcs, non_hs_srcs) = partition haskellish srcs + + haskellish (f,Nothing) = + looksLikeModuleName f || isHaskellSrcFilename f || '.' `notElem` f + haskellish (f,Just phase) = + phase `notElem` [As, Cc, CmmCpp, Cmm, StopLn] + + dflags <- GHC.getSessionDynFlags sess + o_files <- mapM (compileFile dflags StopLn) non_hs_srcs + mapM_ (consIORef v_Ld_inputs) (reverse o_files) + + targets <- mapM (uncurry GHC.guessTarget) hs_srcs + GHC.setTargets sess targets + ok_flag <- GHC.load sess LoadAllTargets when (failed ok_flag) (exitWith (ExitFailure 1)) return () -- --------------------------------------------------------------------------- -- Various banners and verbosity output. -showBanners :: GhcMode -> DynFlags -> [String] -> IO () -showBanners mode dflags static_opts = do +showBanner :: CmdLineMode -> DynFlags -> IO () +showBanner cli_mode dflags = do let verb = verbosity dflags - -- Show the GHCi banner # ifdef GHCI - when (mode == DoInteractive && verb >= 1) $ + when (isInteractiveMode cli_mode && verb >= 1) $ hPutStrLn stdout ghciWelcomeMsg # endif -- Display details of the configuration in verbose mode - when (verb >= 2) $ + when (not (isInteractiveMode cli_mode) && verb >= 2) $ do hPutStr stderr "Glasgow Haskell Compiler, Version " hPutStr stderr cProjectVersion hPutStr stderr ", for Haskell 98, compiled by GHC version " +#ifdef GHCI + -- GHCI is only set when we are bootstrapping... + hPutStrLn stderr cProjectVersion +#else hPutStrLn stderr cBooterVersion +#endif - when (verb >= 3) $ - dumpPackages dflags +showVersion :: IO () +showVersion = do + putStrLn (cProjectName ++ ", version " ++ cProjectVersion) + exitWith ExitSuccess + +showGhcUsage cli_mode = do + (ghc_usage_path,ghci_usage_path) <- getUsageMsgPaths + let usage_path + | DoInteractive <- cli_mode = ghci_usage_path + | otherwise = ghc_usage_path + usage <- readFile usage_path + dump usage + exitWith ExitSuccess + 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 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 + +-- ----------------------------------------------------------------------------- +-- Util - when (verb >= 3) $ - hPutStrLn stderr ("Hsc static flags: " ++ unwords static_opts) +unknownFlagsErr :: [String] -> a +unknownFlagsErr fs = throwDyn (UsageError ("unrecognised flags: " ++ unwords fs))