Linker.lhs

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%************************************************************************
%*									*
		Link some linkables
	The linkables may consist of a mixture of 
	byte-code modules and object modules
%*									*
%************************************************************************

\begin{code}
linkModules :: DynFlags -> [Linkable] -> IO SuccessFlag
linkModules dflags linkables
  = block $ do  -- don't want to be interrupted by ^C in here
	
	let (objs, bcos) = partition isObjectLinkable 
                              (concatMap partitionLinkable linkables)

		-- Load objects first; they can't depend on BCOs
	ok_flag <- dynLinkObjs dflags objs

	if failed ok_flag then 
		return Failed
	  else do
		dynLinkBCOs bcos
		return Succeeded
		

-- HACK to support f-x-dynamic in the interpreter; no other purpose
partitionLinkable :: Linkable -> [Linkable]
partitionLinkable li
   = let li_uls = linkableUnlinked li
         li_uls_obj = filter isObject li_uls
         li_uls_bco = filter isInterpretable li_uls
     in 
         case (li_uls_obj, li_uls_bco) of
            (_:_, _:_) -> [li {linkableUnlinked=li_uls_obj},
                           li {linkableUnlinked=li_uls_bco}]
            _ -> [li]

findModuleLinkable_maybe :: [Linkable] -> Module -> Maybe Linkable
findModuleLinkable_maybe lis mod
   = case [LM time nm us | LM time nm us <- lis, nm == mod] of
        []   -> Nothing
        [li] -> Just li
        _    -> pprPanic "findModuleLinkable" (ppr mod)

linkableInSet :: Linkable -> [Linkable] -> Bool
linkableInSet l objs_loaded =
  case findModuleLinkable_maybe objs_loaded (linkableModule l) of
	Nothing -> False
	Just m  -> linkableTime l == linkableTime m
\end{code}