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Diffstat (limited to 'compiler/GHC/Driver/MakeFile.hs')
| -rw-r--r-- | compiler/GHC/Driver/MakeFile.hs | 424 |
1 files changed, 424 insertions, 0 deletions
diff --git a/compiler/GHC/Driver/MakeFile.hs b/compiler/GHC/Driver/MakeFile.hs new file mode 100644 index 0000000000..d1d3b00394 --- /dev/null +++ b/compiler/GHC/Driver/MakeFile.hs @@ -0,0 +1,424 @@ +{-# LANGUAGE CPP #-} + +----------------------------------------------------------------------------- +-- +-- Makefile Dependency Generation +-- +-- (c) The University of Glasgow 2005 +-- +----------------------------------------------------------------------------- + +module GHC.Driver.MakeFile + ( doMkDependHS + ) +where + +#include "HsVersions.h" + +import GhcPrelude + +import qualified GHC +import GHC.Driver.Monad +import GHC.Driver.Session +import Util +import GHC.Driver.Types +import qualified SysTools +import Module +import Digraph ( SCC(..) ) +import GHC.Driver.Finder +import Outputable +import Panic +import SrcLoc +import Data.List +import FastString +import FileCleanup + +import Exception +import ErrUtils + +import System.Directory +import System.FilePath +import System.IO +import System.IO.Error ( isEOFError ) +import Control.Monad ( when ) +import Data.Maybe ( isJust ) +import Data.IORef + +----------------------------------------------------------------- +-- +-- The main function +-- +----------------------------------------------------------------- + +doMkDependHS :: GhcMonad m => [FilePath] -> m () +doMkDependHS srcs = do + -- Initialisation + dflags0 <- GHC.getSessionDynFlags + + -- We kludge things a bit for dependency generation. Rather than + -- generating dependencies for each way separately, we generate + -- them once and then duplicate them for each way's osuf/hisuf. + -- We therefore do the initial dependency generation with an empty + -- way and .o/.hi extensions, regardless of any flags that might + -- be specified. + let dflags = dflags0 { + ways = [], + buildTag = mkBuildTag [], + hiSuf = "hi", + objectSuf = "o" + } + _ <- GHC.setSessionDynFlags dflags + + when (null (depSuffixes dflags)) $ liftIO $ + throwGhcExceptionIO (ProgramError "You must specify at least one -dep-suffix") + + files <- liftIO $ beginMkDependHS dflags + + -- Do the downsweep to find all the modules + targets <- mapM (\s -> GHC.guessTarget s Nothing) srcs + GHC.setTargets targets + let excl_mods = depExcludeMods dflags + module_graph <- GHC.depanal excl_mods True {- Allow dup roots -} + + -- Sort into dependency order + -- There should be no cycles + let sorted = GHC.topSortModuleGraph False module_graph Nothing + + -- Print out the dependencies if wanted + liftIO $ debugTraceMsg dflags 2 (text "Module dependencies" $$ ppr sorted) + + -- Process them one by one, dumping results into makefile + -- and complaining about cycles + hsc_env <- getSession + root <- liftIO getCurrentDirectory + mapM_ (liftIO . processDeps dflags hsc_env excl_mods root (mkd_tmp_hdl files)) sorted + + -- If -ddump-mod-cycles, show cycles in the module graph + liftIO $ dumpModCycles dflags module_graph + + -- Tidy up + liftIO $ endMkDependHS dflags files + + -- Unconditional exiting is a bad idea. If an error occurs we'll get an + --exception; if that is not caught it's fine, but at least we have a + --chance to find out exactly what went wrong. Uncomment the following + --line if you disagree. + + --`GHC.ghcCatch` \_ -> io $ exitWith (ExitFailure 1) + +----------------------------------------------------------------- +-- +-- beginMkDependHs +-- Create a temporary file, +-- find the Makefile, +-- slurp through it, etc +-- +----------------------------------------------------------------- + +data MkDepFiles + = MkDep { mkd_make_file :: FilePath, -- Name of the makefile + mkd_make_hdl :: Maybe Handle, -- Handle for the open makefile + mkd_tmp_file :: FilePath, -- Name of the temporary file + mkd_tmp_hdl :: Handle } -- Handle of the open temporary file + +beginMkDependHS :: DynFlags -> IO MkDepFiles +beginMkDependHS dflags = do + -- open a new temp file in which to stuff the dependency info + -- as we go along. + tmp_file <- newTempName dflags TFL_CurrentModule "dep" + tmp_hdl <- openFile tmp_file WriteMode + + -- open the makefile + let makefile = depMakefile dflags + exists <- doesFileExist makefile + mb_make_hdl <- + if not exists + then return Nothing + else do + makefile_hdl <- openFile makefile ReadMode + + -- slurp through until we get the magic start string, + -- copying the contents into dep_makefile + let slurp = do + l <- hGetLine makefile_hdl + if (l == depStartMarker) + then return () + else do hPutStrLn tmp_hdl l; slurp + + -- slurp through until we get the magic end marker, + -- throwing away the contents + let chuck = do + l <- hGetLine makefile_hdl + if (l == depEndMarker) + then return () + else chuck + + catchIO slurp + (\e -> if isEOFError e then return () else ioError e) + catchIO chuck + (\e -> if isEOFError e then return () else ioError e) + + return (Just makefile_hdl) + + + -- write the magic marker into the tmp file + hPutStrLn tmp_hdl depStartMarker + + return (MkDep { mkd_make_file = makefile, mkd_make_hdl = mb_make_hdl, + mkd_tmp_file = tmp_file, mkd_tmp_hdl = tmp_hdl}) + + +----------------------------------------------------------------- +-- +-- processDeps +-- +----------------------------------------------------------------- + +processDeps :: DynFlags + -> HscEnv + -> [ModuleName] + -> FilePath + -> Handle -- Write dependencies to here + -> SCC ModSummary + -> IO () +-- Write suitable dependencies to handle +-- Always: +-- this.o : this.hs +-- +-- If the dependency is on something other than a .hi file: +-- this.o this.p_o ... : dep +-- otherwise +-- this.o ... : dep.hi +-- this.p_o ... : dep.p_hi +-- ... +-- (where .o is $osuf, and the other suffixes come from +-- the cmdline -s options). +-- +-- For {-# SOURCE #-} imports the "hi" will be "hi-boot". + +processDeps dflags _ _ _ _ (CyclicSCC nodes) + = -- There shouldn't be any cycles; report them + throwGhcExceptionIO (ProgramError (showSDoc dflags $ GHC.cyclicModuleErr nodes)) + +processDeps dflags hsc_env excl_mods root hdl (AcyclicSCC node) + = do { let extra_suffixes = depSuffixes dflags + include_pkg_deps = depIncludePkgDeps dflags + src_file = msHsFilePath node + obj_file = msObjFilePath node + obj_files = insertSuffixes obj_file extra_suffixes + + do_imp loc is_boot pkg_qual imp_mod + = do { mb_hi <- findDependency hsc_env loc pkg_qual imp_mod + is_boot include_pkg_deps + ; case mb_hi of { + Nothing -> return () ; + Just hi_file -> do + { let hi_files = insertSuffixes hi_file extra_suffixes + write_dep (obj,hi) = writeDependency root hdl [obj] hi + + -- Add one dependency for each suffix; + -- e.g. A.o : B.hi + -- A.x_o : B.x_hi + ; mapM_ write_dep (obj_files `zip` hi_files) }}} + + + -- Emit std dependency of the object(s) on the source file + -- Something like A.o : A.hs + ; writeDependency root hdl obj_files src_file + + -- Emit a dependency for each CPP import + ; when (depIncludeCppDeps dflags) $ do + -- CPP deps are descovered in the module parsing phase by parsing + -- comment lines left by the preprocessor. + -- Note that GHC.parseModule may throw an exception if the module + -- fails to parse, which may not be desirable (see #16616). + { session <- Session <$> newIORef hsc_env + ; parsedMod <- reflectGhc (GHC.parseModule node) session + ; mapM_ (writeDependency root hdl obj_files) + (GHC.pm_extra_src_files parsedMod) + } + + -- Emit a dependency for each import + + ; let do_imps is_boot idecls = sequence_ + [ do_imp loc is_boot mb_pkg mod + | (mb_pkg, L loc mod) <- idecls, + mod `notElem` excl_mods ] + + ; do_imps True (ms_srcimps node) + ; do_imps False (ms_imps node) + } + + +findDependency :: HscEnv + -> SrcSpan + -> Maybe FastString -- package qualifier, if any + -> ModuleName -- Imported module + -> IsBootInterface -- Source import + -> Bool -- Record dependency on package modules + -> IO (Maybe FilePath) -- Interface file file +findDependency hsc_env srcloc pkg imp is_boot include_pkg_deps + = do { -- Find the module; this will be fast because + -- we've done it once during downsweep + r <- findImportedModule hsc_env imp pkg + ; case r of + Found loc _ + -- Home package: just depend on the .hi or hi-boot file + | isJust (ml_hs_file loc) || include_pkg_deps + -> return (Just (addBootSuffix_maybe is_boot (ml_hi_file loc))) + + -- Not in this package: we don't need a dependency + | otherwise + -> return Nothing + + fail -> + let dflags = hsc_dflags hsc_env + in throwOneError $ mkPlainErrMsg dflags srcloc $ + cannotFindModule dflags imp fail + } + +----------------------------- +writeDependency :: FilePath -> Handle -> [FilePath] -> FilePath -> IO () +-- (writeDependency r h [t1,t2] dep) writes to handle h the dependency +-- t1 t2 : dep +writeDependency root hdl targets dep + = do let -- We need to avoid making deps on + -- c:/foo/... + -- on cygwin as make gets confused by the : + -- Making relative deps avoids some instances of this. + dep' = makeRelative root dep + forOutput = escapeSpaces . reslash Forwards . normalise + output = unwords (map forOutput targets) ++ " : " ++ forOutput dep' + hPutStrLn hdl output + +----------------------------- +insertSuffixes + :: FilePath -- Original filename; e.g. "foo.o" + -> [String] -- Suffix prefixes e.g. ["x_", "y_"] + -> [FilePath] -- Zapped filenames e.g. ["foo.x_o", "foo.y_o"] + -- Note that that the extra bit gets inserted *before* the old suffix + -- We assume the old suffix contains no dots, so we know where to + -- split it +insertSuffixes file_name extras + = [ basename <.> (extra ++ suffix) | extra <- extras ] + where + (basename, suffix) = case splitExtension file_name of + -- Drop the "." from the extension + (b, s) -> (b, drop 1 s) + + +----------------------------------------------------------------- +-- +-- endMkDependHs +-- Complete the makefile, close the tmp file etc +-- +----------------------------------------------------------------- + +endMkDependHS :: DynFlags -> MkDepFiles -> IO () + +endMkDependHS dflags + (MkDep { mkd_make_file = makefile, mkd_make_hdl = makefile_hdl, + mkd_tmp_file = tmp_file, mkd_tmp_hdl = tmp_hdl }) + = do + -- write the magic marker into the tmp file + hPutStrLn tmp_hdl depEndMarker + + case makefile_hdl of + Nothing -> return () + Just hdl -> do + + -- slurp the rest of the original makefile and copy it into the output + let slurp = do + l <- hGetLine hdl + hPutStrLn tmp_hdl l + slurp + + catchIO slurp + (\e -> if isEOFError e then return () else ioError e) + + hClose hdl + + hClose tmp_hdl -- make sure it's flushed + + -- Create a backup of the original makefile + when (isJust makefile_hdl) + (SysTools.copy dflags ("Backing up " ++ makefile) + makefile (makefile++".bak")) + + -- Copy the new makefile in place + SysTools.copy dflags "Installing new makefile" tmp_file makefile + + +----------------------------------------------------------------- +-- Module cycles +----------------------------------------------------------------- + +dumpModCycles :: DynFlags -> ModuleGraph -> IO () +dumpModCycles dflags module_graph + | not (dopt Opt_D_dump_mod_cycles dflags) + = return () + + | null cycles + = putMsg dflags (text "No module cycles") + + | otherwise + = putMsg dflags (hang (text "Module cycles found:") 2 pp_cycles) + where + + cycles :: [[ModSummary]] + cycles = + [ c | CyclicSCC c <- GHC.topSortModuleGraph True module_graph Nothing ] + + pp_cycles = vcat [ (text "---------- Cycle" <+> int n <+> ptext (sLit "----------")) + $$ pprCycle c $$ blankLine + | (n,c) <- [1..] `zip` cycles ] + +pprCycle :: [ModSummary] -> SDoc +-- Print a cycle, but show only the imports within the cycle +pprCycle summaries = pp_group (CyclicSCC summaries) + where + cycle_mods :: [ModuleName] -- The modules in this cycle + cycle_mods = map (moduleName . ms_mod) summaries + + pp_group (AcyclicSCC ms) = pp_ms ms + pp_group (CyclicSCC mss) + = ASSERT( not (null boot_only) ) + -- The boot-only list must be non-empty, else there would + -- be an infinite chain of non-boot imports, and we've + -- already checked for that in processModDeps + pp_ms loop_breaker $$ vcat (map pp_group groups) + where + (boot_only, others) = partition is_boot_only mss + is_boot_only ms = not (any in_group (map snd (ms_imps ms))) + in_group (L _ m) = m `elem` group_mods + group_mods = map (moduleName . ms_mod) mss + + loop_breaker = head boot_only + all_others = tail boot_only ++ others + groups = + GHC.topSortModuleGraph True (mkModuleGraph all_others) Nothing + + pp_ms summary = text mod_str <> text (take (20 - length mod_str) (repeat ' ')) + <+> (pp_imps empty (map snd (ms_imps summary)) $$ + pp_imps (text "{-# SOURCE #-}") (map snd (ms_srcimps summary))) + where + mod_str = moduleNameString (moduleName (ms_mod summary)) + + pp_imps :: SDoc -> [Located ModuleName] -> SDoc + pp_imps _ [] = empty + pp_imps what lms + = case [m | L _ m <- lms, m `elem` cycle_mods] of + [] -> empty + ms -> what <+> text "imports" <+> + pprWithCommas ppr ms + +----------------------------------------------------------------- +-- +-- Flags +-- +----------------------------------------------------------------- + +depStartMarker, depEndMarker :: String +depStartMarker = "# DO NOT DELETE: Beginning of Haskell dependencies" +depEndMarker = "# DO NOT DELETE: End of Haskell dependencies" + |