1 -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow 2001
5 -- Access to system tools: gcc, cp, rm etc
7 -----------------------------------------------------------------------------
14 setPgmL, -- String -> IO ()
26 -- Command-line override
29 getTopDir, -- IO String -- The value of $libdir
30 getPackageConfigPath, -- IO String -- Where package.conf is
32 -- Interface to system tools
33 runUnlit, runCpp, runCc, -- [Option] -> IO ()
34 runPp, -- [Option] -> IO ()
35 runMangle, runSplit, -- [Option] -> IO ()
36 runAs, runLink, -- [Option] -> IO ()
39 runIlx2il, runIlasm, -- [String] -> IO ()
43 touch, -- String -> String -> IO ()
44 copy, -- String -> String -> String -> IO ()
45 unDosifyPath, -- String -> String
47 -- Temporary-file management
50 cleanTempFiles, cleanTempFilesExcept, removeTmpFiles,
54 getProcessID, -- IO Int
55 system, -- String -> IO ExitCode
58 showGhcUsage, -- IO () Shows usage message and exits
59 getSysMan, -- IO String Parallel system only
65 #include "HsVersions.h"
70 import Panic ( progName, GhcException(..) )
71 import Util ( global, notNull )
72 import CmdLineOpts ( dynFlag, verbosity )
74 import EXCEPTION ( throwDyn )
75 import DATA_IOREF ( IORef, readIORef, writeIORef )
78 import Monad ( when, unless )
79 import System ( ExitCode(..), exitWith, getEnv, system )
80 import IO ( try, catch,
81 openFile, hPutChar, hPutStrLn, hPutStr, hClose, hFlush, IOMode(..),
83 import Directory ( doesFileExist, removeFile )
84 import List ( intersperse )
86 #include "../includes/config.h"
88 -- GHC <= 4.08 didn't have rawSystem, and runs into problems with long command
89 -- lines on mingw32, so we disallow it now.
90 #if defined(mingw32_HOST_OS) && (__GLASGOW_HASKELL__ <= 408)
91 #error GHC <= 4.08 is not supported for bootstrapping GHC on i386-unknown-mingw32
94 #ifndef mingw32_HOST_OS
95 #if __GLASGOW_HASKELL__ > 504
96 import qualified System.Posix.Internals
97 import System.Posix.Process ( executeFile, getProcessStatus, forkProcess, ProcessStatus(..))
98 import System.Posix.Signals ( installHandler, sigCHLD, sigCONT, Handler(..) )
100 import qualified Posix
101 import Posix ( executeFile, getProcessStatus, forkProcess, ProcessStatus(..), installHandler,
102 sigCHLD, sigCONT, Handler(..) )
104 #else /* Must be Win32 */
105 import List ( isPrefixOf )
106 import Util ( dropList )
108 import CString ( CString, peekCString )
111 #ifdef mingw32_HOST_OS
112 #if __GLASGOW_HASKELL__ > 504
113 import System.Cmd ( rawSystem )
115 import SystemExts ( rawSystem )
121 The configuration story
122 ~~~~~~~~~~~~~~~~~~~~~~~
124 GHC needs various support files (library packages, RTS etc), plus
125 various auxiliary programs (cp, gcc, etc). It finds these in one
128 * When running as an *installed program*, GHC finds most of this support
129 stuff in the installed library tree. The path to this tree is passed
130 to GHC via the -B flag, and given to initSysTools .
132 * When running *in-place* in a build tree, GHC finds most of this support
133 stuff in the build tree. The path to the build tree is, again passed
136 GHC tells which of the two is the case by seeing whether package.conf
137 is in TopDir [installed] or in TopDir/ghc/driver [inplace] (what a hack).
140 SysTools.initSysProgs figures out exactly where all the auxiliary programs
141 are, and initialises mutable variables to make it easy to call them.
142 To to this, it makes use of definitions in Config.hs, which is a Haskell
143 file containing variables whose value is figured out by the build system.
145 Config.hs contains two sorts of things
147 cGCC, The *names* of the programs
150 etc They do *not* include paths
153 cUNLIT_DIR_REL The *path* to the directory containing unlit, split etc
154 cSPLIT_DIR_REL *relative* to the root of the build tree,
155 for use when running *in-place* in a build tree (only)
159 ---------------------------------------------
160 NOTES for an ALTERNATIVE scheme (i.e *not* what is currently implemented):
162 Another hair-brained scheme for simplifying the current tool location
163 nightmare in GHC: Simon originally suggested using another
164 configuration file along the lines of GCC's specs file - which is fine
165 except that it means adding code to read yet another configuration
166 file. What I didn't notice is that the current package.conf is
167 general enough to do this:
170 {name = "tools", import_dirs = [], source_dirs = [],
171 library_dirs = [], hs_libraries = [], extra_libraries = [],
172 include_dirs = [], c_includes = [], package_deps = [],
173 extra_ghc_opts = ["-pgmc/usr/bin/gcc","-pgml${libdir}/bin/unlit", ... etc.],
174 extra_cc_opts = [], extra_ld_opts = []}
176 Which would have the advantage that we get to collect together in one
177 place the path-specific package stuff with the path-specific tool
180 ---------------------------------------------
183 %************************************************************************
185 \subsection{Global variables to contain system programs}
187 %************************************************************************
189 All these pathnames are maintained IN THE NATIVE FORMAT OF THE HOST MACHINE.
190 (See remarks under pathnames below)
193 GLOBAL_VAR(v_Pgm_L, error "pgm_L", String) -- unlit
194 GLOBAL_VAR(v_Pgm_P, error "pgm_P", (String,[Option])) -- cpp
195 GLOBAL_VAR(v_Pgm_F, error "pgm_F", String) -- pp
196 GLOBAL_VAR(v_Pgm_c, error "pgm_c", String) -- gcc
197 GLOBAL_VAR(v_Pgm_m, error "pgm_m", String) -- asm code mangler
198 GLOBAL_VAR(v_Pgm_s, error "pgm_s", String) -- asm code splitter
199 GLOBAL_VAR(v_Pgm_a, error "pgm_a", String) -- as
201 GLOBAL_VAR(v_Pgm_I, error "pgm_I", String) -- ilx2il
202 GLOBAL_VAR(v_Pgm_i, error "pgm_i", String) -- ilasm
204 GLOBAL_VAR(v_Pgm_l, error "pgm_l", String) -- ld
205 GLOBAL_VAR(v_Pgm_MkDLL, error "pgm_dll", String) -- mkdll
207 GLOBAL_VAR(v_Pgm_T, error "pgm_T", String) -- touch
208 GLOBAL_VAR(v_Pgm_CP, error "pgm_CP", String) -- cp
210 GLOBAL_VAR(v_Path_package_config, error "path_package_config", String)
211 GLOBAL_VAR(v_Path_usage, error "ghc_usage.txt", String)
213 GLOBAL_VAR(v_TopDir, error "TopDir", String) -- -B<dir>
215 -- Parallel system only
216 GLOBAL_VAR(v_Pgm_sysman, error "pgm_sysman", String) -- system manager
218 -- ways to get at some of these variables from outside this module
219 getPackageConfigPath = readIORef v_Path_package_config
220 getTopDir = readIORef v_TopDir
224 %************************************************************************
226 \subsection{Initialisation}
228 %************************************************************************
231 initSysTools :: [String] -- Command-line arguments starting "-B"
233 -> IO () -- Set all the mutable variables above, holding
234 -- (a) the system programs
235 -- (b) the package-config file
236 -- (c) the GHC usage message
239 initSysTools minusB_args
240 = do { (am_installed, top_dir) <- findTopDir minusB_args
241 ; writeIORef v_TopDir top_dir
243 -- for "installed" this is the root of GHC's support files
244 -- for "in-place" it is the root of the build tree
245 -- NB: top_dir is assumed to be in standard Unix format '/' separated
247 ; let installed, installed_bin :: FilePath -> FilePath
248 installed_bin pgm = pgmPath top_dir pgm
249 installed file = pgmPath top_dir file
250 inplace dir pgm = pgmPath (top_dir `slash`
251 cPROJECT_DIR `slash` dir) pgm
254 | am_installed = installed "package.conf"
255 | otherwise = inplace cGHC_DRIVER_DIR_REL "package.conf.inplace"
258 | am_installed = installed "ghc-usage.txt"
259 | otherwise = inplace cGHC_DRIVER_DIR_REL "ghc-usage.txt"
261 -- For all systems, unlit, split, mangle are GHC utilities
262 -- architecture-specific stuff is done when building Config.hs
264 | am_installed = installed_bin cGHC_UNLIT_PGM
265 | otherwise = inplace cGHC_UNLIT_DIR_REL cGHC_UNLIT_PGM
267 -- split and mangle are Perl scripts
269 | am_installed = installed_bin cGHC_SPLIT_PGM
270 | otherwise = inplace cGHC_SPLIT_DIR_REL cGHC_SPLIT_PGM
273 | am_installed = installed_bin cGHC_MANGLER_PGM
274 | otherwise = inplace cGHC_MANGLER_DIR_REL cGHC_MANGLER_PGM
276 #ifndef mingw32_HOST_OS
277 -- check whether TMPDIR is set in the environment
278 ; IO.try (do dir <- getEnv "TMPDIR" -- fails if not set
283 -- On Win32, consult GetTempPath() for a temp dir.
284 -- => it first tries TMP, TEMP, then finally the
285 -- Windows directory(!). The directory is in short-path
286 -- form and *does* have a trailing backslash.
288 let len = (2048::Int)
289 buf <- mallocArray len
290 ret <- getTempPath len buf
293 -- failed, consult TEMP.
301 -- strip the trailing backslash (awful, but
302 -- we only do this once).
312 -- Check that the package config exists
313 ; config_exists <- doesFileExist pkgconfig_path
314 ; when (not config_exists) $
315 throwDyn (InstallationError
316 ("Can't find package.conf as " ++ pkgconfig_path))
318 #if defined(mingw32_HOST_OS)
319 -- WINDOWS-SPECIFIC STUFF
320 -- On Windows, gcc and friends are distributed with GHC,
321 -- so when "installed" we look in TopDir/bin
322 -- When "in-place" we look wherever the build-time configure
324 -- When "install" we tell gcc where its specs file + exes are (-B)
325 -- and also some places to pick up include files. We need
326 -- to be careful to put all necessary exes in the -B place
327 -- (as, ld, cc1, etc) since if they don't get found there, gcc
328 -- then tries to run unadorned "as", "ld", etc, and will
329 -- pick up whatever happens to be lying around in the path,
330 -- possibly including those from a cygwin install on the target,
331 -- which is exactly what we're trying to avoid.
332 ; let gcc_path | am_installed = installed_bin ("gcc -B\"" ++ installed "gcc-lib/\"")
334 -- The trailing "/" is absolutely essential; gcc seems
335 -- to construct file names simply by concatenating to this
336 -- -B path with no extra slash
337 -- We use "/" rather than "\\" because otherwise "\\\" is mangled
338 -- later on; although gcc_path is in NATIVE format, gcc can cope
339 -- (see comments with declarations of global variables)
341 -- The quotes round the -B argument are in case TopDir has spaces in it
343 perl_path | am_installed = installed_bin cGHC_PERL
344 | otherwise = cGHC_PERL
346 -- 'touch' is a GHC util for Windows, and similarly unlit, mangle
347 ; let touch_path | am_installed = installed_bin cGHC_TOUCHY_PGM
348 | otherwise = inplace cGHC_TOUCHY_DIR_REL cGHC_TOUCHY_PGM
350 -- On Win32 we don't want to rely on #!/bin/perl, so we prepend
351 -- a call to Perl to get the invocation of split and mangle
352 ; let split_path = perl_path ++ " \"" ++ split_script ++ "\""
353 mangle_path = perl_path ++ " \"" ++ mangle_script ++ "\""
356 | am_installed = pgmPath (installed "gcc-lib/") cMKDLL ++
357 " --dlltool-name " ++ pgmPath (installed "gcc-lib/") "dlltool" ++
358 " --driver-name " ++ gcc_path
361 -- UNIX-SPECIFIC STUFF
362 -- On Unix, the "standard" tools are assumed to be
363 -- in the same place whether we are running "in-place" or "installed"
364 -- That place is wherever the build-time configure script found them.
365 ; let gcc_path = cGCC
367 mkdll_path = panic "Can't build DLLs on a non-Win32 system"
369 -- On Unix, scripts are invoked using the '#!' method. Binary
370 -- installations of GHC on Unix place the correct line on the front
371 -- of the script at installation time, so we don't want to wire-in
372 -- our knowledge of $(PERL) on the host system here.
373 ; let split_path = split_script
374 mangle_path = mangle_script
377 -- cpp is derived from gcc on all platforms
378 -- HACK, see setPgmP below. We keep 'words' here to remember to fix
379 -- Config.hs one day.
380 ; let cpp_path = (gcc_path, (Option "-E"):(map Option (words cRAWCPP_FLAGS)))
382 -- For all systems, copy and remove are provided by the host
383 -- system; architecture-specific stuff is done when building Config.hs
384 ; let cp_path = cGHC_CP
386 -- Other things being equal, as and ld are simply gcc
387 ; let as_path = gcc_path
391 -- ilx2il and ilasm are specified in Config.hs
392 ; let ilx2il_path = cILX2IL
396 -- Initialise the global vars
397 ; writeIORef v_Path_package_config pkgconfig_path
398 ; writeIORef v_Path_usage ghc_usage_msg_path
400 ; writeIORef v_Pgm_sysman (top_dir ++ "/ghc/rts/parallel/SysMan")
401 -- Hans: this isn't right in general, but you can
402 -- elaborate it in the same way as the others
404 ; writeIORef v_Pgm_L unlit_path
405 ; writeIORef v_Pgm_P cpp_path
406 ; writeIORef v_Pgm_F ""
407 ; writeIORef v_Pgm_c gcc_path
408 ; writeIORef v_Pgm_m mangle_path
409 ; writeIORef v_Pgm_s split_path
410 ; writeIORef v_Pgm_a as_path
412 ; writeIORef v_Pgm_I ilx2il_path
413 ; writeIORef v_Pgm_i ilasm_path
415 ; writeIORef v_Pgm_l ld_path
416 ; writeIORef v_Pgm_MkDLL mkdll_path
417 ; writeIORef v_Pgm_T touch_path
418 ; writeIORef v_Pgm_CP cp_path
423 #if defined(mingw32_HOST_OS)
424 foreign import stdcall "GetTempPathA" unsafe getTempPath :: Int -> CString -> IO Int32
428 The various setPgm functions are called when a command-line option
433 is used to override a particular program with a new one
436 setPgmL = writeIORef v_Pgm_L
437 -- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
438 -- Config.hs should really use Option.
439 setPgmP arg = let (pgm:args) = words arg in writeIORef v_Pgm_P (pgm,map Option args)
440 setPgmF = writeIORef v_Pgm_F
441 setPgmc = writeIORef v_Pgm_c
442 setPgmm = writeIORef v_Pgm_m
443 setPgms = writeIORef v_Pgm_s
444 setPgma = writeIORef v_Pgm_a
445 setPgml = writeIORef v_Pgm_l
447 setPgmI = writeIORef v_Pgm_I
448 setPgmi = writeIORef v_Pgm_i
455 -- for "installed" this is the root of GHC's support files
456 -- for "in-place" it is the root of the build tree
459 -- 1. Set proto_top_dir
460 -- a) look for (the last) -B flag, and use it
461 -- b) if there are no -B flags, get the directory
462 -- where GHC is running (only on Windows)
464 -- 2. If package.conf exists in proto_top_dir, we are running
465 -- installed; and TopDir = proto_top_dir
467 -- 3. Otherwise we are running in-place, so
468 -- proto_top_dir will be /...stuff.../ghc/compiler
469 -- Set TopDir to /...stuff..., which is the root of the build tree
471 -- This is very gruesome indeed
473 findTopDir :: [String]
474 -> IO (Bool, -- True <=> am installed, False <=> in-place
475 String) -- TopDir (in Unix format '/' separated)
478 = do { top_dir <- get_proto
479 -- Discover whether we're running in a build tree or in an installation,
480 -- by looking for the package configuration file.
481 ; am_installed <- doesFileExist (top_dir `slash` "package.conf")
483 ; return (am_installed, top_dir)
486 -- get_proto returns a Unix-format path (relying on getExecDir to do so too)
487 get_proto | notNull minusbs
488 = return (unDosifyPath (drop 2 (last minusbs))) -- 2 for "-B"
490 = do { maybe_exec_dir <- getExecDir -- Get directory of executable
491 ; case maybe_exec_dir of -- (only works on Windows;
492 -- returns Nothing on Unix)
493 Nothing -> throwDyn (InstallationError "missing -B<dir> option")
494 Just dir -> return dir
499 %************************************************************************
501 \subsection{Command-line options}
503 %************************************************************************
505 When invoking external tools as part of the compilation pipeline, we
506 pass these a sequence of options on the command-line. Rather than
507 just using a list of Strings, we use a type that allows us to distinguish
508 between filepaths and 'other stuff'. [The reason being, of course, that
509 this type gives us a handle on transforming filenames, and filenames only,
510 to whatever format they're expected to be on a particular platform.]
514 = FileOption -- an entry that _contains_ filename(s) / filepaths.
515 String -- a non-filepath prefix that shouldn't be transformed (e.g., "/out="
516 String -- the filepath/filename portion
519 showOptions :: [Option] -> String
520 showOptions ls = unwords (map (quote.showOpt) ls)
522 showOpt (FileOption pre f) = pre ++ dosifyPath f
523 showOpt (Option "") = ""
524 showOpt (Option s) = s
529 %************************************************************************
531 \subsection{Running an external program}
533 %************************************************************************
537 runUnlit :: [Option] -> IO ()
538 runUnlit args = do p <- readIORef v_Pgm_L
539 runSomething "Literate pre-processor" p args
541 runCpp :: [Option] -> IO ()
542 runCpp args = do (p,baseArgs) <- readIORef v_Pgm_P
543 runSomething "C pre-processor" p (baseArgs ++ args)
545 runPp :: [Option] -> IO ()
546 runPp args = do p <- readIORef v_Pgm_F
547 runSomething "Haskell pre-processor" p args
549 runCc :: [Option] -> IO ()
550 runCc args = do p <- readIORef v_Pgm_c
551 runSomething "C Compiler" p args
553 runMangle :: [Option] -> IO ()
554 runMangle args = do p <- readIORef v_Pgm_m
555 runSomething "Mangler" p args
557 runSplit :: [Option] -> IO ()
558 runSplit args = do p <- readIORef v_Pgm_s
559 runSomething "Splitter" p args
561 runAs :: [Option] -> IO ()
562 runAs args = do p <- readIORef v_Pgm_a
563 runSomething "Assembler" p args
565 runLink :: [Option] -> IO ()
566 runLink args = do p <- readIORef v_Pgm_l
567 runSomething "Linker" p args
570 runIlx2il :: [Option] -> IO ()
571 runIlx2il args = do p <- readIORef v_Pgm_I
572 runSomething "Ilx2Il" p args
574 runIlasm :: [Option] -> IO ()
575 runIlasm args = do p <- readIORef v_Pgm_i
576 runSomething "Ilasm" p args
579 runMkDLL :: [Option] -> IO ()
580 runMkDLL args = do p <- readIORef v_Pgm_MkDLL
581 runSomething "Make DLL" p args
583 touch :: String -> String -> IO ()
584 touch purpose arg = do p <- readIORef v_Pgm_T
585 runSomething purpose p [FileOption "" arg]
587 copy :: String -> String -> String -> IO ()
588 copy purpose from to = do
589 verb <- dynFlag verbosity
590 when (verb >= 2) $ hPutStrLn stderr ("*** " ++ purpose)
592 h <- openFile to WriteMode
593 ls <- readFile from -- inefficient, but it'll do for now.
594 -- ToDo: speed up via slurping.
600 getSysMan :: IO String -- How to invoke the system manager
601 -- (parallel system only)
602 getSysMan = readIORef v_Pgm_sysman
605 %************************************************************************
607 \subsection{GHC Usage message}
609 %************************************************************************
611 Show the usage message and exit
614 showGhcUsage = do { usage_path <- readIORef v_Path_usage
615 ; usage <- readFile usage_path
617 ; exitWith ExitSuccess }
620 dump ('$':'$':s) = hPutStr stderr progName >> dump s
621 dump (c:s) = hPutChar stderr c >> dump s
625 %************************************************************************
627 \subsection{Managing temporary files
629 %************************************************************************
632 GLOBAL_VAR(v_FilesToClean, [], [String] )
633 GLOBAL_VAR(v_TmpDir, cDEFAULT_TMPDIR, String )
634 -- v_TmpDir has no closing '/'
638 setTmpDir dir = writeIORef v_TmpDir dir
640 cleanTempFiles :: Int -> IO ()
641 cleanTempFiles verb = do fs <- readIORef v_FilesToClean
642 removeTmpFiles verb fs
644 cleanTempFilesExcept :: Int -> [FilePath] -> IO ()
645 cleanTempFilesExcept verb dont_delete
646 = do fs <- readIORef v_FilesToClean
647 let leftovers = filter (`notElem` dont_delete) fs
648 removeTmpFiles verb leftovers
649 writeIORef v_FilesToClean dont_delete
652 -- find a temporary name that doesn't already exist.
653 newTempName :: Suffix -> IO FilePath
655 = do x <- getProcessID
656 tmp_dir <- readIORef v_TmpDir
657 findTempName tmp_dir x
659 findTempName tmp_dir x
660 = do let filename = tmp_dir ++ "/ghc" ++ show x ++ '.':extn
661 b <- doesFileExist filename
662 if b then findTempName tmp_dir (x+1)
663 else do add v_FilesToClean filename -- clean it up later
666 addFilesToClean :: [FilePath] -> IO ()
667 -- May include wildcards [used by DriverPipeline.run_phase SplitMangle]
668 addFilesToClean files = mapM_ (add v_FilesToClean) files
670 removeTmpFiles :: Int -> [FilePath] -> IO ()
671 removeTmpFiles verb fs
672 = traceCmd "Deleting temp files"
673 ("Deleting: " ++ unwords fs)
676 rm f = removeFile f `IO.catch`
679 hPutStrLn stderr ("Warning: deleting non-existent " ++ f)
685 %************************************************************************
687 \subsection{Running a program}
689 %************************************************************************
692 GLOBAL_VAR(v_Dry_run, False, Bool)
695 setDryRun = writeIORef v_Dry_run True
697 -----------------------------------------------------------------------------
698 -- Running an external program
700 runSomething :: String -- For -v message
701 -> String -- Command name (possibly a full path)
702 -- assumed already dos-ified
703 -> [Option] -- Arguments
704 -- runSomething will dos-ify them
707 runSomething phase_name pgm args
708 = traceCmd phase_name (concat (intersperse " " (pgm:quoteargs))) $
710 #ifndef mingw32_HOST_OS
712 exit_code <- case mpid of
713 Nothing -> do -- Child
714 executeFile pgm True quoteargs Nothing
715 exitWith (ExitFailure 127)
718 Just child -> do -- Parent
719 #if __GLASGOW_HASKELL__ <= 504
720 -- avoid interaction with broken getProcessStatus-FFI:
721 oldHandler <- installHandler sigCONT Ignore Nothing
723 Just (Exited res) <- getProcessStatus True False child
724 #if __GLASGOW_HASKELL__ <= 504
726 installHandler sigCONT oldHandler Nothing
731 exit_code <- rawSystem cmd_line
733 when (exit_code /= ExitSuccess)
734 $ throwDyn (PhaseFailed phase_name exit_code)
737 -- The pgm is already in native format (appropriate dir separators)
738 cmd_line = pgm ++ ' ':showOptions args
739 -- unwords (pgm : dosifyPaths (map quote args))
740 quoteargs = filter (not.null) (map showOpt args)
742 traceCmd :: String -> String -> IO () -> IO ()
743 -- a) trace the command (at two levels of verbosity)
744 -- b) don't do it at all if dry-run is set
745 traceCmd phase_name cmd_line action
746 = do { verb <- dynFlag verbosity
747 ; when (verb >= 2) $ hPutStrLn stderr ("*** " ++ phase_name)
748 ; when (verb >= 3) $ hPutStrLn stderr cmd_line
752 ; n <- readIORef v_Dry_run
756 ; action `IO.catch` handle_exn verb
759 handle_exn verb exn = do { when (verb >= 2) (hPutStr stderr "\n")
760 ; when (verb >= 3) (hPutStrLn stderr ("Failed: " ++ cmd_line ++ (show exn)))
761 ; throwDyn (PhaseFailed phase_name (ExitFailure 1)) }
765 %************************************************************************
767 \subsection{Path names}
769 %************************************************************************
771 We maintain path names in Unix form ('/'-separated) right until
772 the last moment. On Windows we dos-ify them just before passing them
773 to the Windows command.
775 The alternative, of using '/' consistently on Unix and '\' on Windows,
776 proved quite awkward. There were a lot more calls to dosifyPath,
777 and even on Windows we might invoke a unix-like utility (eg 'sh'), which
778 interpreted a command line 'foo\baz' as 'foobaz'.
781 -----------------------------------------------------------------------------
782 -- Convert filepath into MSDOS form.
784 dosifyPaths :: [String] -> [String]
785 -- dosifyPaths does two things
786 -- a) change '/' to '\'
787 -- b) remove initial '/cygdrive/'
789 unDosifyPath :: String -> String
790 -- Just change '\' to '/'
792 pgmPath :: String -- Directory string in Unix format
793 -> String -- Program name with no directory separators
795 -> String -- Program invocation string in native format
799 #if defined(mingw32_HOST_OS)
801 --------------------- Windows version ------------------
802 dosifyPaths xs = map dosifyPath xs
804 unDosifyPath xs = subst '\\' '/' xs
806 pgmPath dir pgm = dosifyPath dir ++ '\\' : pgm
809 = subst '/' '\\' real_stuff
811 -- fully convince myself that /cygdrive/ prefixes cannot
812 -- really appear here.
813 cygdrive_prefix = "/cygdrive/"
816 | cygdrive_prefix `isPrefixOf` stuff = dropList cygdrive_prefix stuff
821 --------------------- Unix version ---------------------
824 pgmPath dir pgm = dir ++ '/' : pgm
825 dosifyPath stuff = stuff
826 --------------------------------------------------------
829 subst a b ls = map (\ x -> if x == a then b else x) ls
833 -----------------------------------------------------------------------------
834 Path name construction
837 slash :: String -> String -> String
838 absPath, relPath :: [String] -> String
841 relPath xs = foldr1 slash xs
843 absPath xs = "" `slash` relPath xs
845 slash s1 s2 = s1 ++ ('/' : s2)
849 %************************************************************************
851 \subsection{Support code}
853 %************************************************************************
856 -----------------------------------------------------------------------------
857 -- Define getExecDir :: IO (Maybe String)
859 #if defined(mingw32_HOST_OS)
860 getExecDir :: IO (Maybe String)
861 getExecDir = do let len = (2048::Int) -- plenty, PATH_MAX is 512 under Win32.
862 buf <- mallocArray len
863 ret <- getModuleFileName nullPtr buf len
864 if ret == 0 then free buf >> return Nothing
865 else do s <- peekCString buf
867 return (Just (reverse (dropList "/bin/ghc.exe" (reverse (unDosifyPath s)))))
870 foreign import stdcall "GetModuleFileNameA" unsafe
871 getModuleFileName :: Ptr () -> CString -> Int -> IO Int32
873 getExecDir :: IO (Maybe String) = do return Nothing
876 #ifdef mingw32_HOST_OS
877 foreign import ccall "_getpid" unsafe getProcessID :: IO Int -- relies on Int == Int32 on Windows
878 #elif __GLASGOW_HASKELL__ > 504
879 getProcessID :: IO Int
880 getProcessID = System.Posix.Internals.c_getpid >>= return . fromIntegral
882 getProcessID :: IO Int
883 getProcessID = Posix.getProcessID
886 quote :: String -> String
888 quote s = "\"" ++ s ++ "\""