DriverPipeline.hs 31.3 KB
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-----------------------------------------------------------------------------
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-- $Id: DriverPipeline.hs,v 1.55 2001/03/15 11:26:27 simonmar Exp $
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--
-- GHC Driver
--
-- (c) Simon Marlow 2000
--
-----------------------------------------------------------------------------

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#include "../includes/config.h"

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module DriverPipeline (
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	-- interfaces for the batch-mode driver
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   GhcMode(..), getGhcMode, v_GhcMode,
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   genPipeline, runPipeline, pipeLoop,
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	-- interfaces for the compilation manager (interpreted/batch-mode)
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   preprocess, compile, CompResult(..),
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	-- batch-mode linking interface
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   doLink,
        -- DLL building
   doMkDLL
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  ) where

#include "HsVersions.h"

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import CmStaticInfo
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import CmTypes
import GetImports
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import DriverState
import DriverUtil
import DriverMkDepend
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import DriverPhases
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import DriverFlags
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import HscMain
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import TmpFiles
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import Finder
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import HscTypes
import Outputable
import Module
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import ErrUtils
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import CmdLineOpts
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import Config
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import Panic
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import Util

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import Time 		( getClockTime )
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import Directory
import System
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import IOExts
import Exception

import IO
import Monad
import Maybe

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import PackedString
import MatchPS

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-----------------------------------------------------------------------------
-- GHC modes of operation

data GhcMode
  = DoMkDependHS			-- ghc -M
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  | DoMkDLL				-- ghc --mk-dll
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  | StopBefore Phase			-- ghc -E | -C | -S | -c
  | DoMake				-- ghc --make
  | DoInteractive			-- ghc --interactive
  | DoLink				-- [ the default ]
  deriving (Eq)

GLOBAL_VAR(v_GhcMode, error "todo", GhcMode)

modeFlag :: String -> Maybe GhcMode
modeFlag "-M" 		 = Just $ DoMkDependHS
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modeFlag "--mk-dll"      = Just $ DoMkDLL
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modeFlag "-E" 		 = Just $ StopBefore Hsc
modeFlag "-C" 		 = Just $ StopBefore HCc
modeFlag "-S" 		 = Just $ StopBefore As
modeFlag "-c" 		 = Just $ StopBefore Ln
modeFlag "--make"        = Just $ DoMake
modeFlag "--interactive" = Just $ DoInteractive
modeFlag _               = Nothing

getGhcMode :: [String]
	 -> IO ( [String]   -- rest of command line
	       , GhcMode
	       , String	    -- "GhcMode" flag
	       )
getGhcMode flags 
  = case my_partition modeFlag flags of
	([]   , rest) -> return (rest, DoLink,  "") -- default is to do linking
	([(flag,one)], rest) -> return (rest, one, flag)
	(_    , _   ) -> 
	  throwDyn (OtherError 
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		"only one of the flags -M, -E, -C, -S, -c, --make, --interactive, -mk-dll is allowed")
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-----------------------------------------------------------------------------
-- genPipeline
--
-- Herein is all the magic about which phases to run in which order, whether
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-- the intermediate files should be in TMPDIR or in the current directory,
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-- what the suffix of the intermediate files should be, etc.

-- The following compilation pipeline algorithm is fairly hacky.  A
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-- better way to do this would be to express the whole compilation as a
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-- data flow DAG, where the nodes are the intermediate files and the
-- edges are the compilation phases.  This framework would also work
-- nicely if a haskell dependency generator was included in the
-- driver.

-- It would also deal much more cleanly with compilation phases that
-- generate multiple intermediates, (eg. hsc generates .hc, .hi, and
-- possibly stub files), where some of the output files need to be
-- processed further (eg. the stub files need to be compiled by the C
-- compiler).

-- A cool thing to do would then be to execute the data flow graph
-- concurrently, automatically taking advantage of extra processors on
-- the host machine.  For example, when compiling two Haskell files
-- where one depends on the other, the data flow graph would determine
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-- that the C compiler from the first compilation can be overlapped
-- with the hsc compilation for the second file.
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data IntermediateFileType
  = Temporary
  | Persistent
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  deriving (Eq, Show)
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genPipeline
   :: GhcMode		-- when to stop
   -> String		-- "stop after" flag (for error messages)
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   -> Bool		-- True => output is persistent
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   -> HscLang		-- preferred output language for hsc
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   -> String		-- original filename
   -> IO [ 		-- list of phases to run for this file
	     (Phase,
	      IntermediateFileType,  -- keep the output from this phase?
	      String)   	     -- output file suffix
         ]	

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genPipeline todo stop_flag persistent_output lang filename 
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 = do
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   split      <- readIORef v_Split_object_files
   mangle     <- readIORef v_Do_asm_mangling
   keep_hc    <- readIORef v_Keep_hc_files
   keep_raw_s <- readIORef v_Keep_raw_s_files
   keep_s     <- readIORef v_Keep_s_files
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   osuf       <- readIORef v_Object_suf
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   let
   ----------- -----  ----   ---   --   --  -  -  -
    (_basename, suffix) = splitFilename filename

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    start = startPhase suffix

      -- special case for mkdependHS: .hspp files go through MkDependHS
    start_phase | todo == DoMkDependHS && start == Hsc  = MkDependHS
	        | otherwise = start
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    haskellish = haskellish_suffix suffix
    cish = cish_suffix suffix

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       -- for a .hc file we need to force lang to HscC
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    real_lang | start_phase == HCc  = HscC
	      | otherwise           = lang
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   let
   ----------- -----  ----   ---   --   --  -  -  -
    pipeline
      | todo == DoMkDependHS = [ Unlit, Cpp, MkDependHS ]

      | haskellish = 
       case real_lang of
	HscC    | split && mangle -> [ Unlit, Cpp, Hsc, HCc, Mangle, 
					SplitMangle, SplitAs ]
	        | mangle          -> [ Unlit, Cpp, Hsc, HCc, Mangle, As ]
	        | split	       	  -> not_valid
	        | otherwise       -> [ Unlit, Cpp, Hsc, HCc, As ]

	HscAsm  | split           -> [ Unlit, Cpp, Hsc, SplitMangle, SplitAs ]
	        | otherwise       -> [ Unlit, Cpp, Hsc, As ]

	HscJava	| split	          -> not_valid
		| otherwise       -> error "not implemented: compiling via Java"
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#ifdef ILX
	HscILX  | split           -> not_valid
		| otherwise       -> [ Unlit, Cpp, Hsc ]
#endif
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      | cish      = [ Cc, As ]

      | otherwise = [ ]  -- just pass this file through to the linker

	-- ToDo: this is somewhat cryptic
    not_valid = throwDyn (OtherError ("invalid option combination"))
   ----------- -----  ----   ---   --   --  -  -  -

	-- this shouldn't happen.
   if start_phase /= Ln && start_phase `notElem` pipeline
	then throwDyn (OtherError ("can't find starting phase for "
				    ++ filename))
	else do

   let
   ----------- -----  ----   ---   --   --  -  -  -
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      myPhaseInputExt Ln = case osuf of Nothing -> phaseInputExt Ln
					Just s  -> s
      myPhaseInputExt other = phaseInputExt other

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      annotatePipeline
	 :: [Phase]		-- raw pipeline
	 -> Phase		-- phase to stop before
     	 -> [(Phase, IntermediateFileType, String{-file extension-})]
      annotatePipeline []     _    = []
      annotatePipeline (Ln:_) _    = []
      annotatePipeline (phase:next_phase:ps) stop = 
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     	  (phase, keep_this_output, myPhaseInputExt next_phase)
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	     : annotatePipeline (next_phase:ps) stop
     	  where
     		keep_this_output
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     		     | next_phase == stop 
                     = if persistent_output then Persistent else Temporary
     		     | otherwise
     		     = case next_phase of
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     			     Ln -> Persistent
     			     Mangle | keep_raw_s -> Persistent
     			     As     | keep_s     -> Persistent
     			     HCc    | keep_hc    -> Persistent
     			     _other              -> Temporary

	-- add information about output files to the pipeline
	-- the suffix on an output file is determined by the next phase
	-- in the pipeline, so we add linking to the end of the pipeline
	-- to force the output from the final phase to be a .o file.
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      stop_phase = case todo of 
			StopBefore As | split -> SplitAs
			StopBefore phase      -> phase
			DoMkDependHS	      -> Ln
			DoLink                -> Ln
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      annotated_pipeline = annotatePipeline (pipeline ++ [ Ln ]) stop_phase

      phase_ne p (p1,_,_) = (p1 /= p)
   ----------- -----  ----   ---   --   --  -  -  -

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	-- if we can't find the phase we're supposed to stop before,
	-- something has gone wrong.  This test carefully avoids the
	-- case where we aren't supposed to do any compilation, because the file
	-- is already in linkable form (for example).
   if start_phase `elem` pipeline && 
 	(stop_phase /= Ln && stop_phase `notElem` pipeline)
      then throwDyn (OtherError 
		("flag " ++ stop_flag
		 ++ " is incompatible with source file `" ++ filename ++ "'"))
      else do

   return (
     takeWhile (phase_ne stop_phase ) $
     dropWhile (phase_ne start_phase) $
     annotated_pipeline
    )
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runPipeline
  :: [ (Phase, IntermediateFileType, String) ] -- phases to run
  -> String			-- input file
  -> Bool			-- doing linking afterward?
  -> Bool			-- take into account -o when generating output?
  -> IO String			-- return final filename

runPipeline pipeline input_fn do_linking use_ofile
  = pipeLoop pipeline input_fn do_linking use_ofile basename suffix
  where (basename, suffix) = splitFilename input_fn

pipeLoop [] input_fn _ _ _ _ = return input_fn
pipeLoop ((phase, keep, o_suffix):phases) 
	input_fn do_linking use_ofile orig_basename orig_suffix
  = do

     output_fn <- outputFileName (null phases) keep o_suffix

     carry_on <- run_phase phase orig_basename orig_suffix input_fn output_fn
	-- sometimes we bail out early, eg. when the compiler's recompilation
	-- checker has determined that recompilation isn't necessary.
     if not carry_on 
	then do let (_,keep,final_suffix) = last phases
	        ofile <- outputFileName True keep final_suffix
		return ofile
	else do -- carry on ...

     pipeLoop phases output_fn do_linking use_ofile orig_basename orig_suffix

  where
     outputFileName last_phase keep suffix
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  	= do o_file <- readIORef v_Output_file
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   	     if last_phase && not do_linking && use_ofile && isJust o_file
   	       then case o_file of 
   		       Just s  -> return s
   		       Nothing -> error "outputFileName"
   	       else if keep == Persistent
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   			   then odir_ify (orig_basename ++ '.':suffix)
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   			   else newTempName suffix

-------------------------------------------------------------------------------
-- Unlit phase 

run_phase Unlit _basename _suff input_fn output_fn
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  = do unlit <- readIORef v_Pgm_L
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       unlit_flags <- getOpts opt_L
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       runSomething "Literate pre-processor"
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	  ("echo '# 1 \"" ++input_fn++"\"' > "++output_fn++" && "
	   ++ unlit ++ ' ':input_fn ++ " - >> " ++ output_fn)
       return True

-------------------------------------------------------------------------------
-- Cpp phase 

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run_phase Cpp basename suff input_fn output_fn
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  = do src_opts <- getOptionsFromSource input_fn
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       unhandled_flags <- processArgs dynamic_flags src_opts []

       when (not (null unhandled_flags)) 
            (throwDyn (OtherError (
                          basename ++ "." ++ suff 
                          ++ ": static flags are not allowed in {-# OPTIONS #-} pragmas:\n\t" 
                          ++ unwords unhandled_flags)) (ExitFailure 1))
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       do_cpp <- dynFlag cppFlag
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       if do_cpp
          then do
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       	    cpp <- readIORef v_Pgm_P
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	    hscpp_opts <- getOpts opt_P
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       	    hs_src_cpp_opts <- readIORef v_Hs_source_cpp_opts
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	    cmdline_include_paths <- readIORef v_Include_paths
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	    pkg_include_dirs <- getPackageIncludePath
	    let include_paths = map (\p -> "-I"++p) (cmdline_include_paths
							++ pkg_include_dirs)

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	    verb <- getVerbFlag
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	    (md_c_flags, _) <- machdepCCOpts
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	    runSomething "C pre-processor" 
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		(unwords
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       	    	   (["echo '{-# LINE 1 \"" ++ input_fn ++ "\" #-}'", ">", output_fn, "&&",
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		     cpp, verb] 
		    ++ include_paths
		    ++ hs_src_cpp_opts
		    ++ hscpp_opts
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		    ++ md_c_flags
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		    ++ [ "-x", "c", input_fn, ">>", output_fn ]
		   ))
	  else do
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	    runSomething "Ineffective C pre-processor"
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	           ("echo '{-# LINE 1 \""  ++ input_fn ++ "\" #-}' > " 
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		    ++ output_fn ++ " && cat " ++ input_fn
		    ++ " >> " ++ output_fn)
       return True

-----------------------------------------------------------------------------
-- MkDependHS phase

run_phase MkDependHS basename suff input_fn _output_fn = do 
   src <- readFile input_fn
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   let (import_sources, import_normals, module_name) = getImports src
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   deps_sources <- mapM (findDependency True basename)  import_sources
   deps_normals <- mapM (findDependency False basename) import_normals
   let deps = deps_sources ++ deps_normals
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   osuf_opt <- readIORef v_Object_suf
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   let osuf = case osuf_opt of
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			Nothing -> phaseInputExt Ln
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			Just s  -> s

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   extra_suffixes <- readIORef v_Dep_suffixes
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   let suffixes = osuf : map (++ ('_':osuf)) extra_suffixes
       ofiles = map (\suf -> basename ++ '.':suf) suffixes
   	   
   objs <- mapM odir_ify ofiles
   
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   hdl <- readIORef v_Dep_tmp_hdl
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	-- std dependency of the object(s) on the source file
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   hPutStrLn hdl (unwords objs ++ " : " ++ basename ++ '.':suff)

   let genDep (dep, False {- not an hi file -}) = 
	  hPutStrLn hdl (unwords objs ++ " : " ++ dep)
       genDep (dep, True  {- is an hi file -}) = do
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	  hisuf <- readIORef v_Hi_suf
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	  let dep_base = remove_suffix '.' dep
	      deps = (dep_base ++ hisuf)
		     : map (\suf -> dep_base ++ suf ++ '_':hisuf) extra_suffixes
		  -- length objs should be == length deps
	  sequence_ (zipWith (\o d -> hPutStrLn hdl (o ++ " : " ++ d)) objs deps)

   mapM genDep [ d | Just d <- deps ]

   return True

-- add the lines to dep_makefile:
	   -- always:
		   -- this.o : this.hs

  	   -- if the dependency is on something other than a .hi file:
   		   -- this.o this.p_o ... : dep
   	   -- otherwise
   		   -- if the import is {-# SOURCE #-}
   			   -- this.o this.p_o ... : dep.hi-boot[-$vers]
   			   
   		   -- else
   			   -- this.o ...   : dep.hi
   			   -- this.p_o ... : dep.p_hi
   			   -- ...
   
   	   -- (where .o is $osuf, and the other suffixes come from
   	   -- the cmdline -s options).
   
-----------------------------------------------------------------------------
-- Hsc phase

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-- Compilation of a single module, in "legacy" mode (_not_ under
-- the direction of the compilation manager).
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run_phase Hsc basename suff input_fn output_fn
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  = do
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  -- we add the current directory (i.e. the directory in which
  -- the .hs files resides) to the import path, since this is
  -- what gcc does, and it's probably what you want.
	let current_dir = getdir basename
	
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	paths <- readIORef v_Include_paths
	writeIORef v_Include_paths (current_dir : paths)
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  -- figure out where to put the .hi file
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	ohi    <- readIORef v_Output_hi
	hisuf  <- readIORef v_Hi_suf
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	let hifile = case ohi of
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			   Nothing -> basename ++ '.':hisuf
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			   Just fn -> fn
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  -- figure out if the source has changed, for recompilation avoidance.
  -- only do this if we're eventually going to generate a .o file.
  -- (ToDo: do when generating .hc files too?)
  --
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  -- Setting source_unchanged to True means that M.o seems
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  -- to be up to date wrt M.hs; so no need to recompile unless imports have
  -- changed (which the compiler itself figures out).
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  -- Setting source_unchanged to False tells the compiler that M.o is out of
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  -- date wrt M.hs (or M.o doesn't exist) so we must recompile regardless.
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	do_recomp <- readIORef v_Recomp
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	todo <- readIORef v_GhcMode
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        o_file' <- odir_ify (basename ++ '.':phaseInputExt Ln)
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        o_file <- osuf_ify o_file'
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	source_unchanged <- 
          if not (do_recomp && ( todo == DoLink || todo == StopBefore Ln ))
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	     then return False
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	     else do t1 <- getModificationTime (basename ++ '.':suff)
		     o_file_exists <- doesFileExist o_file
		     if not o_file_exists
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		        then return False	-- Need to recompile
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			else do t2 <- getModificationTime o_file
			        if t2 > t1
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				  then return True
				  else return False
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	 -- build a ModuleLocation to pass to hscMain.
        modsrc <- readFile input_fn
        let (srcimps,imps,mod_name) = getImports modsrc

	Just (mod, location)
	   <- mkHomeModuleLocn mod_name basename (basename ++ '.':suff)
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  -- get the DynFlags
        dyn_flags <- readIORef v_DynFlags

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  -- run the compiler!
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        pcs <- initPersistentCompilerState
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	result <- hscMain OneShot
                          dyn_flags{ hscOutName = output_fn }
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			  mod
			  location{ ml_hspp_file=Just input_fn }
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			  source_unchanged
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			  False
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			  Nothing	 -- no iface
			  emptyModuleEnv -- HomeSymbolTable
			  emptyModuleEnv -- HomeIfaceTable
			  pcs
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	case result of {

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	    HscFail pcs -> throwDyn (PhaseFailed "hsc" (ExitFailure 1));
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            HscNoRecomp pcs details iface -> 
	        do {
		  runSomething "Touching object file" ("touch " ++ o_file);
		  return False;
		};
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	    HscRecomp pcs details iface maybe_stub_h maybe_stub_c 
		      _maybe_interpreted_code -> do
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	    -- deal with stubs
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	maybe_stub_o <- dealWithStubs basename maybe_stub_h maybe_stub_c
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	case maybe_stub_o of
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		Nothing -> return ()
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		Just stub_o -> add v_Ld_inputs stub_o
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	return True
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    }
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-----------------------------------------------------------------------------
-- Cc phase

-- we don't support preprocessing .c files (with -E) now.  Doing so introduces
-- way too many hacks, and I can't say I've ever used it anyway.

run_phase cc_phase _basename _suff input_fn output_fn
   | cc_phase == Cc || cc_phase == HCc
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   = do	cc <- readIORef v_Pgm_c
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       	cc_opts <- (getOpts opt_c)
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       	cmdline_include_dirs <- readIORef v_Include_paths
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        let hcc = cc_phase == HCc

		-- add package include paths even if we're just compiling
		-- .c files; this is the Value Add(TM) that using
		-- ghc instead of gcc gives you :)
        pkg_include_dirs <- getPackageIncludePath
	let include_paths = map (\p -> "-I"++p) (cmdline_include_dirs 
							++ pkg_include_dirs)

	c_includes <- getPackageCIncludes
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	cmdline_includes <- dynFlag cmdlineHcIncludes -- -#include options
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	let cc_injects | hcc = unlines (map mk_include 
					(c_includes ++ reverse cmdline_includes))
		       | otherwise = ""
	    mk_include h_file = 
		case h_file of 
		   '"':_{-"-} -> "#include "++h_file
		   '<':_      -> "#include "++h_file
		   _          -> "#include \""++h_file++"\""

	cc_help <- newTempName "c"
	h <- openFile cc_help WriteMode
	hPutStr h cc_injects
	hPutStrLn h ("#include \"" ++ input_fn ++ "\"\n")
	hClose h

	ccout <- newTempName "ccout"

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	mangle <- readIORef v_Do_asm_mangling
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	(md_c_flags, md_regd_c_flags) <- machdepCCOpts

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        verb <- getVerbFlag
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	o2 <- readIORef v_minus_o2_for_C
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	let opt_flag | o2        = "-O2"
		     | otherwise = "-O"

	pkg_extra_cc_opts <- getPackageExtraCcOpts

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	split_objs <- readIORef v_Split_object_files
	let split_opt | hcc && split_objs = [ "-DUSE_SPLIT_MARKERS" ]
		      | otherwise         = [ ]

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	excessPrecision <- readIORef v_Excess_precision
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	runSomething "C Compiler"
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	 (unwords ([ cc, "-x", "c", cc_help, "-o", output_fn ]
		   ++ md_c_flags
		   ++ (if cc_phase == HCc && mangle
			 then md_regd_c_flags
			 else [])
		   ++ [ verb, "-S", "-Wimplicit", opt_flag ]
		   ++ [ "-D__GLASGOW_HASKELL__="++cProjectVersionInt ]
		   ++ cc_opts
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		   ++ split_opt
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		   ++ (if excessPrecision then [] else [ "-ffloat-store" ])
		   ++ include_paths
		   ++ pkg_extra_cc_opts
--		   ++ [">", ccout]
		   ))
	return True

	-- ToDo: postprocess the output from gcc

-----------------------------------------------------------------------------
-- Mangle phase

run_phase Mangle _basename _suff input_fn output_fn
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  = do mangler <- readIORef v_Pgm_m
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       mangler_opts <- getOpts opt_m
       machdep_opts <-
	 if (prefixMatch "i386" cTARGETPLATFORM)
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	    then do n_regs <- dynFlag stolen_x86_regs
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		    return [ show n_regs ]
	    else return []
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       runSomething "Assembly Mangler"
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	(unwords (mangler : 
		     mangler_opts
		  ++ [ input_fn, output_fn ]
		  ++ machdep_opts
		))
       return True

-----------------------------------------------------------------------------
-- Splitting phase

run_phase SplitMangle _basename _suff input_fn _output_fn
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  = do  splitter <- readIORef v_Pgm_s
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	-- this is the prefix used for the split .s files
	tmp_pfx <- readIORef v_TmpDir
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	x <- myGetProcessID
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	let split_s_prefix = tmp_pfx ++ "/ghc" ++ show x
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	writeIORef v_Split_prefix split_s_prefix
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	addFilesToClean [split_s_prefix ++ "__*"] -- d:-)

	-- allocate a tmp file to put the no. of split .s files in (sigh)
	n_files <- newTempName "n_files"

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	runSomething "Split Assembly File"
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	 (unwords [ splitter
		  , input_fn
		  , split_s_prefix
		  , n_files ]
	 )

	-- save the number of split files for future references
	s <- readFile n_files
	let n = read s :: Int
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	writeIORef v_N_split_files n
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	return True

-----------------------------------------------------------------------------
-- As phase

run_phase As _basename _suff input_fn output_fn
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  = do	as <- readIORef v_Pgm_a
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        as_opts <- getOpts opt_a

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        cmdline_include_paths <- readIORef v_Include_paths
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        let cmdline_include_flags = map (\p -> "-I"++p) cmdline_include_paths
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        runSomething "Assembler"
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	   (unwords (as : as_opts
		       ++ cmdline_include_flags
		       ++ [ "-c", input_fn, "-o",  output_fn ]
		    ))
	return True

run_phase SplitAs basename _suff _input_fn _output_fn
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  = do  as <- readIORef v_Pgm_a
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        as_opts <- getOpts opt_a

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	split_s_prefix <- readIORef v_Split_prefix
	n <- readIORef v_N_split_files
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	odir <- readIORef v_Output_dir
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	let real_odir = case odir of
				Nothing -> basename
				Just d  -> d

	let assemble_file n = do
		    let input_s  = split_s_prefix ++ "__" ++ show n ++ ".s"
		    let output_o = newdir real_odir 
					(basename ++ "__" ++ show n ++ ".o")
		    real_o <- osuf_ify output_o
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		    runSomething "Assembler" 
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			    (unwords (as : as_opts
				      ++ [ "-c", "-o", real_o, input_s ]
			    ))
	
	mapM_ assemble_file [1..n]
	return True

-----------------------------------------------------------------------------
-- Linking

doLink :: [String] -> IO ()
doLink o_files = do
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    ln <- readIORef v_Pgm_l
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    verb <- getVerbFlag
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    static <- readIORef v_Static
    let imp = if static then "" else "_imp"
    no_hs_main <- readIORef v_NoHsMain

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    o_file <- readIORef v_Output_file
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    let output_fn = case o_file of { Just s -> s; Nothing -> "a.out"; }

    pkg_lib_paths <- getPackageLibraryPath
    let pkg_lib_path_opts = map ("-L"++) pkg_lib_paths

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    lib_paths <- readIORef v_Library_paths
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    let lib_path_opts = map ("-L"++) lib_paths

    pkg_libs <- getPackageLibraries
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    let pkg_lib_opts = map (\lib -> "-l" ++ lib ++ imp) pkg_libs
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    libs <- readIORef v_Cmdline_libraries
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    let lib_opts = map ("-l"++) (reverse libs)
	 -- reverse because they're added in reverse order from the cmd line

    pkg_extra_ld_opts <- getPackageExtraLdOpts

	-- probably _stub.o files
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    extra_ld_inputs <- readIORef v_Ld_inputs
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	-- opts from -optl-<blah>
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    extra_ld_opts <- getStaticOpts v_Opt_l
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    rts_pkg <- getPackageDetails ["rts"]
    std_pkg <- getPackageDetails ["std"]
#ifdef mingw32_TARGET_OS
    let extra_os = if static || no_hs_main
                   then []
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                   else [ head (library_dirs (head rts_pkg)) ++ "/Main.dll_o",
                          head (library_dirs (head std_pkg)) ++ "/PrelMain.dll_o" ]
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#endif
    (md_c_flags, _) <- machdepCCOpts
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    runSomething "Linker"
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       (unwords
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	 ([ ln, verb, "-o", output_fn ]
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	 ++ md_c_flags
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	 ++ o_files
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#ifdef mingw32_TARGET_OS
	 ++ extra_os
#endif
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	 ++ extra_ld_inputs
	 ++ lib_path_opts
	 ++ lib_opts
	 ++ pkg_lib_path_opts
	 ++ pkg_lib_opts
	 ++ pkg_extra_ld_opts
	 ++ extra_ld_opts
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#ifdef mingw32_TARGET_OS
         ++ if static then [ "-u _PrelMain_mainIO_closure" , "-u ___init_PrelMain"] else []
#else
	 ++ [ "-u PrelMain_mainIO_closure" , "-u __init_PrelMain"]
#endif
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	)
       )

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-----------------------------------------------------------------------------
-- Making a DLL

-- only for Win32, but bits that are #ifdefed in doLn are still #ifdefed here
-- in a vain attempt to aid future portability
doMkDLL :: [String] -> IO ()
doMkDLL o_files = do
    ln <- readIORef v_Pgm_dll
    verb <- getVerbFlag
    static <- readIORef v_Static
    let imp = if static then "" else "_imp"
    no_hs_main <- readIORef v_NoHsMain

    o_file <- readIORef v_Output_file
    let output_fn = case o_file of { Just s -> s; Nothing -> "HSdll.dll"; }

    pkg_lib_paths <- getPackageLibraryPath
    let pkg_lib_path_opts = map ("-L"++) pkg_lib_paths

    lib_paths <- readIORef v_Library_paths
    let lib_path_opts = map ("-L"++) lib_paths

    pkg_libs <- getPackageLibraries
    let pkg_lib_opts = map (\lib -> "-l" ++ lib ++ imp) pkg_libs

    libs <- readIORef v_Cmdline_libraries
    let lib_opts = map ("-l"++) (reverse libs)
	 -- reverse because they're added in reverse order from the cmd line

    pkg_extra_ld_opts <- getPackageExtraLdOpts

	-- probably _stub.o files
    extra_ld_inputs <- readIORef v_Ld_inputs

	-- opts from -optdll-<blah>
    extra_ld_opts <- getStaticOpts v_Opt_dll

    rts_pkg <- getPackageDetails ["rts"]
    std_pkg <- getPackageDetails ["std"]
#ifdef mingw32_TARGET_OS
    let extra_os = if static || no_hs_main
                   then []
                   else [ head (library_dirs (head rts_pkg)) ++ "/Main.dll_o",
                          head (library_dirs (head std_pkg)) ++ "/PrelMain.dll_o" ]
#endif
    (md_c_flags, _) <- machdepCCOpts
    runSomething "DLL creator"
       (unwords
	 ([ ln, verb, "-o", output_fn ]
	 ++ md_c_flags
	 ++ o_files
#ifdef mingw32_TARGET_OS
	 ++ extra_os
	 ++ [ "--target=i386-mingw32" ]
#endif
	 ++ extra_ld_inputs
	 ++ lib_path_opts
	 ++ lib_opts
	 ++ pkg_lib_path_opts
	 ++ pkg_lib_opts
	 ++ pkg_extra_ld_opts
         ++ (case findPS (packString (concat extra_ld_opts)) (packString "--def") of
               Nothing -> [ "--export-all" ]
	       Just _  -> [ "" ])
	 ++ extra_ld_opts
	)
       )

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-----------------------------------------------------------------------------
-- Just preprocess a file, put the result in a temp. file (used by the
-- compilation manager during the summary phase).

preprocess :: FilePath -> IO FilePath
preprocess filename =
  ASSERT(haskellish_file filename) 
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  do init_dyn_flags <- readIORef v_InitDynFlags
     writeIORef v_DynFlags init_dyn_flags
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     pipeline <- genPipeline (StopBefore Hsc) ("preprocess") False 
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			defaultHscLang filename
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     runPipeline pipeline filename False{-no linking-} False{-no -o flag-}
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-----------------------------------------------------------------------------
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-- Compile a single module, under the control of the compilation manager.
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--
-- This is the interface between the compilation manager and the
-- compiler proper (hsc), where we deal with tedious details like
-- reading the OPTIONS pragma from the source file, and passing the
-- output of hsc through the C compiler.

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-- The driver sits between 'compile' and 'hscMain', translating calls
-- to the former into calls to the latter, and results from the latter
-- into results from the former.  It does things like preprocessing
-- the .hs file if necessary, and compiling up the .stub_c files to
-- generate Linkables.

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-- NB.  No old interface can also mean that the source has changed.

compile :: GhciMode                -- distinguish batch from interactive
        -> ModSummary              -- summary, including source
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	-> Bool			   -- True <=> source unchanged
	-> Bool			   -- True <=> have object
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        -> Maybe ModIface          -- old interface, if available
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        -> HomeSymbolTable         -- for home module ModDetails
	-> HomeIfaceTable	   -- for home module Ifaces
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        -> PersistentCompilerState -- persistent compiler state
        -> IO CompResult

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data CompResult
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   = CompOK   PersistentCompilerState	-- updated PCS
              ModDetails  -- new details (HST additions)
              ModIface    -- new iface   (HIT additions)
              (Maybe Linkable)
                       -- new code; Nothing => compilation was not reqd
                       -- (old code is still valid)
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   | CompErrs PersistentCompilerState	-- updated PCS


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compile ghci_mode summary source_unchanged have_object 
	old_iface hst hit pcs = do 
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   init_dyn_flags <- readIORef v_InitDynFlags
   writeIORef v_DynFlags init_dyn_flags
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   showPass init_dyn_flags 
	(showSDoc (text "Compiling" <+> ppr (name_of_summary summary)))
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   let verb = verbosity init_dyn_flags
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   let location   = ms_location summary
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   let input_fn   = unJust "compile:hs" (ml_hs_file location) 
   let input_fnpp = unJust "compile:hspp" (ml_hspp_file location)
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   when (verb >= 2) (hPutStrLn stderr ("compile: input file " ++ input_fnpp))
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   opts <- getOptionsFromSource input_fnpp
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   processArgs dynamic_flags opts []
   dyn_flags <- readIORef v_DynFlags

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   let hsc_lang = hscLang dyn_flags
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   output_fn <- case hsc_lang of
		    HscAsm         -> newTempName (phaseInputExt As)
		    HscC           -> newTempName (phaseInputExt HCc)
        	    HscJava        -> newTempName "java" -- ToDo
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#ifdef ILX
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		    HscILX         -> newTempName "ilx"	-- ToDo
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#endif
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		    HscInterpreted -> return (error "no output file")
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   -- run the compiler
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   hsc_result <- hscMain ghci_mode dyn_flags{ hscOutName = output_fn } 
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			 (ms_mod summary) location
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			 source_unchanged have_object old_iface hst hit pcs
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   case hsc_result of
      HscFail pcs -> return (CompErrs pcs)
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      HscNoRecomp pcs details iface -> return (CompOK pcs details iface Nothing)
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      HscRecomp pcs details iface
	maybe_stub_h maybe_stub_c maybe_interpreted_code -> do
	   
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	   let (basename, _) = splitFilename input_fn
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	   maybe_stub_o <- dealWithStubs basename maybe_stub_h maybe_stub_c
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	   let stub_unlinked = case maybe_stub_o of
				  Nothing -> []
				  Just stub_o -> [ DotO stub_o ]
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	   (hs_unlinked, unlinked_time) <-
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	     case hsc_lang of

		-- in interpreted mode, just return the compiled code
		-- as our "unlinked" object.
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		HscInterpreted -> 
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		    case maybe_interpreted_code of
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		       Just (bcos,itbl_env) -> do tm <- getClockTime 
                                                  return ([BCOs bcos itbl_env], tm)
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		       Nothing -> panic "compile: no interpreted code"
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		-- we're in batch mode: finish the compilation pipeline.
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		_other -> do pipe <- genPipeline (StopBefore Ln) "" True 
					hsc_lang output_fn
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                             -- runPipeline takes input_fn so it can split off 
                             -- the base name and use it as the base of 
                             -- the output object file.
                             let (basename, suffix) = splitFilename input_fn
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			     o_file <- pipeLoop pipe output_fn False False 
                                                basename suffix
                             o_time <- getModificationTime o_file
			     return ([DotO o_file], o_time)
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	   let linkable = LM unlinked_time (moduleName (ms_mod summary)) 
			     (hs_unlinked ++ stub_unlinked)
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	   return (CompOK pcs details iface (Just linkable))

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-----------------------------------------------------------------------------
-- stub .h and .c files (for foreign export support)

dealWithStubs basename maybe_stub_h maybe_stub_c

 = do	let stub_h = basename ++ "_stub.h"
	let stub_c = basename ++ "_stub.c"

  -- copy the .stub_h file into the current dir if necessary
	case maybe_stub_h of
	   Nothing -> return ()
	   Just tmp_stub_h -> do
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	      	runSomething "Copy stub .h file"
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				("cp " ++ tmp_stub_h ++ ' ':stub_h)
	
			-- #include <..._stub.h> in .hc file
		addCmdlineHCInclude tmp_stub_h	-- hack

  -- copy the .stub_c file into the current dir, and compile it, if necessary
	case maybe_stub_c of
	   Nothing -> return Nothing
	   Just tmp_stub_c -> do  -- copy the _stub.c file into the current dir
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		runSomething "Copy stub .c file" 
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		    (unwords [ 
			"rm -f", stub_c, "&&",
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			"echo \'#include \"Stg.h\"\n#include \""++stub_h++"\"\' >"++stub_c, " &&",
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			"cat", tmp_stub_c, ">> ", stub_c
			])

			-- compile the _stub.c file w/ gcc
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		pipeline <- genPipeline (StopBefore Ln) "" True 
				defaultHscLang stub_c
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		stub_o <- runPipeline pipeline stub_c False{-no linking-} 
				False{-no -o option-}

		return (Just stub_o)