X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fmain%2FDriverPipeline.hs;h=cd11e0f361971c6e10f3ec76726bc64439e0dc87;hb=374bc02f5feb4f5bf709d0a04d15ce28ec71eef1;hp=910d491261c8b65eb6747545991bf2bab642ae75;hpb=34c2b1b2cdc009b62402bd1c31ffc1ae17df8969;p=ghc-hetmet.git diff --git a/ghc/compiler/main/DriverPipeline.hs b/ghc/compiler/main/DriverPipeline.hs index 910d491..cd11e0f 100644 --- a/ghc/compiler/main/DriverPipeline.hs +++ b/ghc/compiler/main/DriverPipeline.hs @@ -42,7 +42,6 @@ import ErrUtils import DynFlags import StaticFlags ( v_Ld_inputs, opt_Static, WayName(..) ) import Config -import RdrName ( GlobalRdrEnv ) import Panic import Util import StringBuffer ( hGetStringBuffer ) @@ -54,6 +53,9 @@ import ParserCoreUtils ( getCoreModuleName ) import SrcLoc ( srcLocSpan, mkSrcLoc ) import FastString ( mkFastString ) import Bag ( listToBag, emptyBag ) +import SrcLoc ( Located(..) ) + +import Distribution.Compiler ( extensionsToGHCFlag ) import EXCEPTION import DATA_IOREF ( readIORef, writeIORef, IORef ) @@ -63,6 +65,7 @@ import Directory import System import IO import Monad +import Data.List ( isSuffixOf ) import Maybe @@ -93,7 +96,6 @@ preprocess dflags (filename, mb_phase) = -- NB. No old interface can also mean that the source has changed. compile :: HscEnv - -> (Messages -> IO ()) -- error message callback -> ModSummary -> Maybe Linkable -- Just linkable <=> source unchanged -> Maybe ModIface -- Old interface, if available @@ -108,7 +110,7 @@ data CompResult | CompErrs -compile hsc_env msg_act mod_summary maybe_old_linkable old_iface mod_index nmods = do +compile hsc_env mod_summary maybe_old_linkable old_iface mod_index nmods = do let dflags0 = hsc_dflags hsc_env this_mod = ms_mod mod_summary @@ -124,16 +126,16 @@ compile hsc_env msg_act mod_summary maybe_old_linkable old_iface mod_index nmods let input_fn = expectJust "compile:hs" (ml_hs_file location) let input_fnpp = expectJust "compile:hspp" (ms_hspp_file mod_summary) - debugTraceMsg dflags0 2 ("compile: input file " ++ input_fnpp) + debugTraceMsg dflags0 2 (text "compile: input file" <+> text input_fnpp) -- Add in the OPTIONS from the source file -- This is nasty: we've done this once already, in the compilation manager -- It might be better to cache the flags in the ml_hspp_file field,say let hspp_buf = expectJust "compile:hspp_buf" (ms_hspp_buf mod_summary) - opts = getOptionsFromStringBuffer hspp_buf + opts = getOptionsFromStringBuffer hspp_buf input_fn (dflags1,unhandled_flags) <- parseDynamicFlags dflags0 (map snd opts) if (not (null unhandled_flags)) - then do msg_act (optionsErrorMsgs unhandled_flags opts input_fn) + then do printErrorsAndWarnings dflags1 (optionsErrorMsgs unhandled_flags opts input_fn) return CompErrs else do @@ -156,8 +158,6 @@ compile hsc_env msg_act mod_summary maybe_old_linkable old_iface mod_index nmods let dflags' = dflags { hscTarget = hsc_lang, hscOutName = output_fn, - hscStubCOutName = basename ++ "_stub.c", - hscStubHOutName = basename ++ "_stub.h", extCoreName = basename ++ ".hcr" } -- -no-recomp should also work with --make @@ -166,77 +166,96 @@ compile hsc_env msg_act mod_summary maybe_old_linkable old_iface mod_index nmods hsc_env' = hsc_env { hsc_dflags = dflags' } object_filename = ml_obj_file location + let getStubLinkable False = return [] + getStubLinkable True + = do stub_o <- compileStub dflags' this_mod location + return [ DotO stub_o ] + + handleMake (HscNoRecomp, iface, details) + = ASSERT (isJust maybe_old_linkable) + return (CompOK details iface maybe_old_linkable) + handleMake (HscRecomp hasStub, iface, details) + | isHsBoot src_flavour + = return (CompOK details iface Nothing) + | otherwise + = do stub_unlinked <- getStubLinkable hasStub + (hs_unlinked, unlinked_time) <- + case hsc_lang of + HscNothing + -> return ([], ms_hs_date mod_summary) + -- We're in --make mode: finish the compilation pipeline. + _other + -> do runPipeline StopLn dflags (output_fn,Nothing) Persistent + (Just location) + -- The object filename comes from the ModLocation + o_time <- getModificationTime object_filename + return ([DotO object_filename], o_time) + let linkable = LM unlinked_time this_mod + (hs_unlinked ++ stub_unlinked) + return (CompOK details iface (Just linkable)) + + handleInterpreted (InteractiveNoRecomp, iface, details) + = ASSERT (isJust maybe_old_linkable) + return (CompOK details iface maybe_old_linkable) + handleInterpreted (InteractiveRecomp hasStub comp_bc, iface, details) + = do stub_unlinked <- getStubLinkable hasStub + let hs_unlinked = [BCOs comp_bc] + unlinked_time = ms_hs_date mod_summary + -- Why do we use the timestamp of the source file here, + -- rather than the current time? This works better in + -- the case where the local clock is out of sync + -- with the filesystem's clock. It's just as accurate: + -- if the source is modified, then the linkable will + -- be out of date. + let linkable = LM unlinked_time this_mod + (hs_unlinked ++ stub_unlinked) + return (CompOK details iface (Just linkable)) + + let runCompiler compiler handle + = do mbResult <- compiler hsc_env' mod_summary + source_unchanged old_iface + (Just (mod_index, nmods)) + case mbResult of + Nothing -> return CompErrs + Just result -> handle result -- run the compiler - hsc_result <- hscMain hsc_env' msg_act mod_summary - source_unchanged have_object old_iface - (Just (mod_index, nmods)) - - case hsc_result of - HscFail -> return CompErrs - - HscNoRecomp details iface -> - ASSERT(isJust maybe_old_linkable) - return (CompOK details iface maybe_old_linkable) - - HscRecomp details iface stub_h_exists stub_c_exists maybe_interpreted_code - - | isHsBoot src_flavour -- No further compilation to do - -> do case hsc_lang of - HscInterpreted -> return () - _other -> SysTools.touch dflags' "Touching object file" - object_filename - return (CompOK details iface Nothing) - - | otherwise -- Normal source file - -> do - maybe_stub_o <- compileStub dflags' stub_c_exists - let stub_unlinked = case maybe_stub_o of - Nothing -> [] - Just stub_o -> [ DotO stub_o ] - - (hs_unlinked, unlinked_time) <- - case hsc_lang of - - -- in interpreted mode, just return the compiled code - -- as our "unlinked" object. - HscInterpreted - -> case maybe_interpreted_code of -#ifdef GHCI - Just comp_bc -> return ([BCOs comp_bc], ms_hs_date mod_summary) - -- Why do we use the timestamp of the source file here, - -- rather than the current time? This works better in - -- the case where the local clock is out of sync - -- with the filesystem's clock. It's just as accurate: - -- if the source is modified, then the linkable will - -- be out of date. -#endif - Nothing -> panic "compile: no interpreted code" - - -- We're in --make mode: finish the compilation pipeline. - _other - -> do runPipeline StopLn dflags (output_fn,Nothing) Persistent - (Just location) - -- The object filename comes from the ModLocation - - o_time <- getModificationTime object_filename - return ([DotO object_filename], o_time) - - let linkable = LM unlinked_time this_mod - (hs_unlinked ++ stub_unlinked) - - return (CompOK details iface (Just linkable)) + case hsc_lang of + HscInterpreted | not (isHsBoot src_flavour) -- We can't compile boot files to + -- bytecode so don't even try. + -> runCompiler hscCompileInteractive handleInterpreted + _other + -> runCompiler hscCompileMake handleMake ----------------------------------------------------------------------------- -- stub .h and .c files (for foreign export support) -compileStub dflags stub_c_exists - | not stub_c_exists = return Nothing - | stub_c_exists = do +-- The _stub.c file is derived from the haskell source file, possibly taking +-- into account the -stubdir option. +-- +-- Consequently, we derive the _stub.o filename from the haskell object +-- filename. +-- +-- This isn't necessarily the same as the object filename we +-- would get if we just compiled the _stub.c file using the pipeline. +-- For example: +-- +-- ghc src/A.hs -odir obj +-- +-- results in obj/A.o, and src/A_stub.c. If we compile src/A_stub.c with +-- -odir obj, we would get obj/src/A_stub.o, which is wrong; we want +-- obj/A_stub.o. + +compileStub :: DynFlags -> Module -> ModLocation -> IO FilePath +compileStub dflags mod location = do + let (o_base, o_ext) = splitFilename (ml_obj_file location) + stub_o = o_base ++ "_stub" `joinFileExt` o_ext + -- compile the _stub.c file w/ gcc - let stub_c = hscStubCOutName dflags - (_, stub_o) <- runPipeline StopLn dflags - (stub_c,Nothing) Persistent Nothing{-no ModLocation-} - return (Just stub_o) + let (stub_c,_) = mkStubPaths dflags mod location + runPipeline StopLn dflags (stub_c,Nothing) + (SpecificFile stub_o) Nothing{-no ModLocation-} + + return stub_o -- --------------------------------------------------------------------------- @@ -274,33 +293,52 @@ link BatchCompile dflags batch_attempt_linking hpt pkg_deps = concatMap (dep_pkgs . mi_deps . hm_iface) home_mod_infos -- the linkables to link - linkables = map (fromJust.hm_linkable) home_mod_infos + linkables = map (expectJust "link".hm_linkable) home_mod_infos - debugTraceMsg dflags 3 "link: linkables are ..." - debugTraceMsg dflags 3 (showSDoc (vcat (map ppr linkables))) + debugTraceMsg dflags 3 (text "link: linkables are ..." $$ vcat (map ppr linkables)) -- check for the -no-link flag if isNoLink (ghcLink dflags) - then do debugTraceMsg dflags 3 "link(batch): linking omitted (-c flag given)." + then do debugTraceMsg dflags 3 (text "link(batch): linking omitted (-c flag given).") return Succeeded else do - debugTraceMsg dflags 1 "Linking ..." - let getOfiles (LM _ _ us) = map nameOfObject (filter isObject us) obj_files = concatMap getOfiles linkables + exe_file = exeFileName dflags + + -- if the modification time on the executable is later than the + -- modification times on all of the objects, then omit linking + -- (unless the -no-recomp flag was given). + e_exe_time <- IO.try $ getModificationTime exe_file + let linking_needed + | Left _ <- e_exe_time = True + | Right t <- e_exe_time = + any (t <) (map linkableTime linkables) + + if dopt Opt_RecompChecking dflags && not linking_needed + then do debugTraceMsg dflags 1 (text exe_file <+> ptext SLIT("is up to date, linking not required.")) + return Succeeded + else do + + debugTraceMsg dflags 1 (ptext SLIT("Linking") <+> text exe_file + <+> text "...") + -- Don't showPass in Batch mode; doLink will do that for us. - staticLink dflags obj_files pkg_deps + let link = case ghcLink dflags of + MkDLL -> doMkDLL + StaticLink -> staticLink + link dflags obj_files pkg_deps - debugTraceMsg dflags 3 "link: done" + debugTraceMsg dflags 3 (text "link: done") -- staticLink only returns if it succeeds return Succeeded | otherwise - = do debugTraceMsg dflags 3 "link(batch): upsweep (partially) failed OR" - debugTraceMsg dflags 3 " Main.main not exported; not linking." + = do debugTraceMsg dflags 3 (text "link(batch): upsweep (partially) failed OR" $$ + text " Main.main not exported; not linking.") return Succeeded @@ -470,7 +508,7 @@ getOutputFilename dflags stop_phase output basename = func where hcsuf = hcSuf dflags - odir = outputDir dflags + odir = objectDir dflags osuf = objectSuf dflags keep_hc = dopt Opt_KeepHcFiles dflags keep_raw_s = dopt Opt_KeepRawSFiles dflags @@ -508,7 +546,7 @@ getOutputFilename dflags stop_phase output basename odir_persistent | Just loc <- maybe_location = ml_obj_file loc - | Just d <- odir = replaceFilenameDirectory persistent d + | Just d <- odir = d `joinFileName` persistent | otherwise = persistent @@ -621,7 +659,7 @@ runPhase (Hsc src_flavour) stop dflags0 basename suff input_fn get_output_fn _ma ; return (Nothing, mkModule m) } other -> do { buf <- hGetStringBuffer input_fn - ; (_,_,mod_name) <- getImports dflags buf input_fn + ; (_,_,L _ mod_name) <- getImports dflags buf input_fn ; return (Just buf, mod_name) } -- Build a ModLocation to pass to hscMain. @@ -703,8 +741,6 @@ runPhase (Hsc src_flavour) stop dflags0 basename suff input_fn get_output_fn _ma let dflags' = dflags { hscTarget = hsc_lang, hscOutName = output_fn, - hscStubCOutName = basename ++ "_stub.c", - hscStubHOutName = basename ++ "_stub.h", extCoreName = basename ++ ".hcr" } hsc_env <- newHscEnv dflags' @@ -713,40 +749,28 @@ runPhase (Hsc src_flavour) stop dflags0 basename suff input_fn get_output_fn _ma addHomeModuleToFinder hsc_env mod_name location4 -- run the compiler! - result <- hscMain hsc_env printErrorsAndWarnings + mbResult <- hscCompileOneShot hsc_env mod_summary source_unchanged - False -- No object file Nothing -- No iface Nothing -- No "module i of n" progress info - case result of - - HscFail -> throwDyn (PhaseFailed "hsc" (ExitFailure 1)) - - HscNoRecomp details iface -> do - SysTools.touch dflags' "Touching object file" o_file - -- The .o file must have a later modification date - -- than the source file (else we wouldn't be in HscNoRecomp) - -- but we touch it anyway, to keep 'make' happy (we think). - return (StopLn, dflags', Just location4, o_file) - - HscRecomp _details _iface - stub_h_exists stub_c_exists - _maybe_interpreted_code -> do - - -- Deal with stubs - maybe_stub_o <- compileStub dflags' stub_c_exists - case maybe_stub_o of - Nothing -> return () - Just stub_o -> consIORef v_Ld_inputs stub_o - - -- In the case of hs-boot files, generate a dummy .o-boot - -- stamp file for the benefit of Make - case src_flavour of - HsBootFile -> SysTools.touch dflags' "Touching object file" o_file - other -> return () - - return (next_phase, dflags', Just location4, output_fn) + case mbResult of + Nothing -> throwDyn (PhaseFailed "hsc" (ExitFailure 1)) + Just HscNoRecomp + -> do SysTools.touch dflags' "Touching object file" o_file + -- The .o file must have a later modification date + -- than the source file (else we wouldn't be in HscNoRecomp) + -- but we touch it anyway, to keep 'make' happy (we think). + return (StopLn, dflags', Just location4, o_file) + Just (HscRecomp hasStub) + -> do when hasStub $ + do stub_o <- compileStub dflags' mod_name location4 + consIORef v_Ld_inputs stub_o + -- In the case of hs-boot files, generate a dummy .o-boot + -- stamp file for the benefit of Make + when (isHsBoot src_flavour) $ + SysTools.touch dflags' "Touching object file" o_file + return (next_phase, dflags', Just location4, output_fn) ----------------------------------------------------------------------------- -- Cmm phase @@ -765,8 +789,6 @@ runPhase Cmm stop dflags basename suff input_fn get_output_fn maybe_loc let dflags' = dflags { hscTarget = hsc_lang, hscOutName = output_fn, - hscStubCOutName = basename ++ "_stub.c", - hscStubHOutName = basename ++ "_stub.h", extCoreName = basename ++ ".hcr" } ok <- hscCmmFile dflags' input_fn @@ -811,6 +833,9 @@ runPhase cc_phase stop dflags basename suff input_fn get_output_fn maybe_loc let excessPrecision = dopt Opt_ExcessPrecision dflags + let cc_opt | optLevel dflags >= 2 = "-O2" + | otherwise = "-O" + -- Decide next phase let mangle = dopt Opt_DoAsmMangling dflags @@ -819,6 +844,23 @@ runPhase cc_phase stop dflags basename suff input_fn get_output_fn maybe_loc | otherwise = As output_fn <- get_output_fn next_phase maybe_loc + let + more_hcc_opts = +#if i386_TARGET_ARCH + -- on x86 the floating point regs have greater precision + -- than a double, which leads to unpredictable results. + -- By default, we turn this off with -ffloat-store unless + -- the user specified -fexcess-precision. + (if excessPrecision then [] else [ "-ffloat-store" ]) ++ +#endif + -- gcc's -fstrict-aliasing allows two accesses to memory + -- to be considered non-aliasing if they have different types. + -- This interacts badly with the C code we generate, which is + -- very weakly typed, being derived from C--. + ["-fno-strict-aliasing"] + + + SysTools.runCc dflags ( -- force the C compiler to interpret this file as C when -- compiling .hc files, by adding the -x c option. @@ -835,11 +877,13 @@ runPhase cc_phase stop dflags basename suff input_fn get_output_fn maybe_loc ++ (if hcc && mangle then md_regd_c_flags else []) - ++ [ verb, "-S", "-Wimplicit", "-O" ] + ++ (if hcc + then more_hcc_opts + else []) + ++ [ verb, "-S", "-Wimplicit", cc_opt ] ++ [ "-D__GLASGOW_HASKELL__="++cProjectVersionInt ] ++ cc_opts ++ split_opt - ++ (if excessPrecision then [] else [ "-ffloat-store" ]) ++ include_paths ++ pkg_extra_cc_opts )) @@ -927,34 +971,64 @@ runPhase As stop dflags _basename _suff input_fn get_output_fn maybe_loc runPhase SplitAs stop dflags basename _suff _input_fn get_output_fn maybe_loc - = do let as_opts = getOpts dflags opt_a + = do + output_fn <- get_output_fn StopLn maybe_loc + + let (base_o, _) = splitFilename output_fn + split_odir = base_o ++ "_split" + osuf = objectSuf dflags + + createDirectoryHierarchy split_odir + + -- remove M_split/ *.o, because we're going to archive M_split/ *.o + -- later and we don't want to pick up any old objects. + fs <- getDirectoryContents split_odir + mapM_ removeFile $ map (split_odir `joinFileName`) + $ filter (osuf `isSuffixOf`) fs + + let as_opts = getOpts dflags opt_a (split_s_prefix, n) <- readIORef v_Split_info - let real_odir - | Just d <- outputDir dflags = d - | otherwise = basename ++ "_split" + let split_s n = split_s_prefix ++ "__" ++ show n `joinFileExt` "s" + split_obj n = split_odir `joinFileName` + filenameOf base_o ++ "__" ++ show n + `joinFileExt` osuf let assemble_file n - = do let input_s = split_s_prefix ++ "__" ++ show n ++ ".s" - let output_o = replaceFilenameDirectory - (basename ++ "__" ++ show n ++ ".o") - real_odir - let osuf = objectSuf dflags - let real_o = replaceFilenameSuffix output_o osuf - SysTools.runAs dflags - (map SysTools.Option as_opts ++ - [ SysTools.Option "-c" - , SysTools.Option "-o" - , SysTools.FileOption "" real_o - , SysTools.FileOption "" input_s - ]) + = SysTools.runAs dflags + (map SysTools.Option as_opts ++ + [ SysTools.Option "-c" + , SysTools.Option "-o" + , SysTools.FileOption "" (split_obj n) + , SysTools.FileOption "" (split_s n) + ]) mapM_ assemble_file [1..n] - output_fn <- get_output_fn StopLn maybe_loc + -- and join the split objects into a single object file: + let ld_r args = SysTools.runLink dflags ([ + SysTools.Option "-nostdlib", + SysTools.Option "-nodefaultlibs", + SysTools.Option "-Wl,-r", + SysTools.Option ld_x_flag, + SysTools.Option "-o", + SysTools.FileOption "" output_fn ] ++ args) + ld_x_flag | null cLD_X = "" + | otherwise = "-Wl,-x" + + if cLdIsGNULd == "YES" + then do + let script = split_odir `joinFileName` "ld.script" + writeFile script $ + "INPUT(" ++ unwords (map split_obj [1..n]) ++ ")" + ld_r [SysTools.FileOption "" script] + else do + ld_r (map (SysTools.FileOption "" . split_obj) [1..n]) + return (StopLn, dflags, maybe_loc, output_fn) + ----------------------------------------------------------------------------- -- MoveBinary sort-of-phase -- After having produced a binary, move it somewhere else and generate a @@ -1078,18 +1152,12 @@ getHCFilePackages filename = staticLink :: DynFlags -> [FilePath] -> [PackageId] -> IO () staticLink dflags o_files dep_packages = do let verb = getVerbFlag dflags + output_fn = exeFileName dflags -- get the full list of packages to link with, by combining the -- explicit packages with the auto packages and all of their -- dependencies, and eliminating duplicates. - let o_file = outputFile dflags -#if defined(mingw32_HOST_OS) - let output_fn = case o_file of { Just s -> s; Nothing -> "main.exe"; } -#else - let output_fn = case o_file of { Just s -> s; Nothing -> "a.out"; } -#endif - pkg_lib_paths <- getPackageLibraryPath dflags dep_packages let pkg_lib_path_opts = map ("-L"++) pkg_lib_paths @@ -1175,6 +1243,24 @@ staticLink dflags o_files dep_packages = do if success then return () else throwDyn (InstallationError ("cannot move binary to PVM dir"))) + +exeFileName :: DynFlags -> FilePath +exeFileName dflags + | Just s <- outputFile dflags = +#if defined(mingw32_HOST_OS) + if null (suffixOf s) + then s `joinFileExt` "exe" + else s +#else + s +#endif + | otherwise = +#if defined(mingw32_HOST_OS) + "main.exe" +#else + "a.out" +#endif + ----------------------------------------------------------------------------- -- Making a DLL (only for Win32) @@ -1300,14 +1386,19 @@ hsSourceCppOpts = ----------------------------------------------------------------------------- -- Reading OPTIONS pragmas +-- This is really very ugly and should be rewritten. +-- - some error messages are thrown as exceptions (should return) +-- - we ignore LINE pragmas +-- - parsing is horrible, combination of prefixMatch and 'read'. + getOptionsFromSource :: String -- input file -> IO [String] -- options, if any getOptionsFromSource file = do h <- openFile file ReadMode - look h `finally` hClose h + look h 1 `finally` hClose h where - look h = do + look h i = do r <- tryJust ioErrors (hGetLine h) case r of Left e | isEOFError e -> return [] @@ -1315,18 +1406,18 @@ getOptionsFromSource file Right l' -> do let l = removeSpaces l' case () of - () | null l -> look h - | prefixMatch "#" l -> look h - | prefixMatch "{-# LINE" l -> look h -- -} - | Just opts <- matchOptions l - -> do rest <- look h + () | null l -> look h (i+1) + | prefixMatch "#" l -> look h (i+1) + | prefixMatch "{-# LINE" l -> look h (i+1) -- -} wrong! + | Just opts <- matchOptions i file l + -> do rest <- look h (i+1) return (opts ++ rest) | otherwise -> return [] -getOptionsFromStringBuffer :: StringBuffer -> [(Int,String)] -getOptionsFromStringBuffer buffer@(StringBuffer _ len# _) = +getOptionsFromStringBuffer :: StringBuffer -> FilePath -> [(Int,String)] +getOptionsFromStringBuffer buffer@(StringBuffer _ len _) fn = let - ls = lines (lexemeToString buffer (I# len#)) -- lazy, so it's ok + ls = lines (lexemeToString buffer len) -- lazy, so it's ok in look 1 ls where @@ -1336,37 +1427,57 @@ getOptionsFromStringBuffer buffer@(StringBuffer _ len# _) = case () of () | null l -> look (i+1) ls | prefixMatch "#" l -> look (i+1) ls - | prefixMatch "{-# LINE" l -> look (i+1) ls -- -} - | Just opts <- matchOptions l + | prefixMatch "{-# LINE" l -> look (i+1) ls -- -} wrong! + | Just opts <- matchOptions i fn l -> zip (repeat i) opts ++ look (i+1) ls | otherwise -> [] -- detect {-# OPTIONS_GHC ... #-}. For the time being, we accept OPTIONS -- instead of OPTIONS_GHC, but that is deprecated. -matchOptions s +matchOptions i fn s | Just s1 <- maybePrefixMatch "{-#" s -- -} - = matchOptions1 (removeSpaces s1) + = matchOptions1 i fn (removeSpaces s1) | otherwise = Nothing where - matchOptions1 s + matchOptions1 i fn s | Just s2 <- maybePrefixMatch "OPTIONS" s = case () of _ | Just s3 <- maybePrefixMatch "_GHC" s2, not (is_ident (head s3)) - -> matchOptions2 s3 + -> matchOptions2 i fn s3 | not (is_ident (head s2)) - -> matchOptions2 s2 + -> matchOptions2 i fn s2 | otherwise -> Just [] -- OPTIONS_anything is ignored, not treated as start of source | Just s2 <- maybePrefixMatch "INCLUDE" s, not (is_ident (head s2)), Just s3 <- maybePrefixMatch "}-#" (reverse s2) = Just ["-#include", removeSpaces (reverse s3)] + + | Just s2 <- maybePrefixMatch "LANGUAGE" s, not (is_ident (head s2)), + Just s3 <- maybePrefixMatch "}-#" (reverse s2) + = case [ exts | (exts,"") <- reads ('[' : reverse (']':s3))] of + [] -> languagePragParseError i fn + exts:_ -> case extensionsToGHCFlag exts of + ([], opts) -> Just opts + (unsup,_) -> unsupportedExtnError i fn unsup | otherwise = Nothing - matchOptions2 s + matchOptions2 i fn s | Just s3 <- maybePrefixMatch "}-#" (reverse s) = Just (words (reverse s3)) | otherwise = Nothing +languagePragParseError i fn = + pgmError (showSDoc (mkLocMessage loc ( + text "cannot parse LANGUAGE pragma"))) + where loc = srcLocSpan (mkSrcLoc (mkFastString fn) i 0) + +unsupportedExtnError i fn unsup = + pgmError (showSDoc (mkLocMessage loc ( + text "unsupported extensions: " <> + hcat (punctuate comma (map (text.show) unsup))))) + where loc = srcLocSpan (mkSrcLoc (mkFastString fn) i 0) + + optionsErrorMsgs :: [String] -> [(Int,String)] -> FilePath -> Messages optionsErrorMsgs unhandled_flags flags_lines filename = (emptyBag, listToBag (map mkMsg unhandled_flags_lines))