+ let
+ hi_exts =
+ [ (package_hisuf, mkPackageModLocation package_hisuf mod_name) ]
+
+ source_exts =
+ [ ("hs", mkPackageModLocation package_hisuf mod_name)
+ , ("lhs", mkPackageModLocation package_hisuf mod_name)
+ ]
+
+ -- mkdependHS needs to look for source files in packages too, so
+ -- that we can make dependencies between package before they have
+ -- been built.
+ exts
+ | mode == DoMkDependHS = hi_exts ++ source_exts
+ | otherwise = hi_exts
+
+ -- we never look for a .hi-boot file in an external package;
+ -- .hi-boot files only make sense for the home package.
+ searchPathExts imp_dirs mod_name exts
+
+-- -----------------------------------------------------------------------------
+-- General path searching
+
+searchPathExts
+ :: [FilePath] -- paths to search
+ -> ModuleName -- module name
+ -> [ (
+ String, -- suffix
+ String -> String -> String -> IO (Module, ModLocation) -- action
+ )
+ ]
+ -> IO (Either [FilePath] (Module, ModLocation))
+
+searchPathExts path mod_name exts = search to_search
+ where
+ mod_str = moduleNameUserString mod_name
+ basename = map (\c -> if c == '.' then '/' else c) mod_str
+
+ to_search :: [(FilePath, IO (Module,ModLocation))]
+ to_search = [ (file, fn p basename ext)
+ | p <- path,
+ (ext,fn) <- exts,
+ let base | p == "." = basename
+ | otherwise = p ++ '/':basename
+ file = base ++ '.':ext
+ ]
+
+ search [] = return (Left (map fst to_search))
+ search ((file, result) : rest) = do
+ b <- doesFileExist file
+ if b
+ then Right `liftM` result
+ else search rest
+
+-- -----------------------------------------------------------------------------
+-- Building ModLocations
+
+mkHiOnlyModLocation hisuf mod_name path basename extension = do
+ loc <- hiOnlyModLocation path basename hisuf
+ let result = (mkHomeModule mod_name, loc)
+ addToFinderCache mod_name result
+ return result
+
+mkPackageModLocation hisuf mod_name path basename _extension = do
+ loc <- hiOnlyModLocation path basename hisuf
+ let result = (mkPackageModule mod_name, loc)
+ addToFinderCache mod_name result
+ return result
+
+hiOnlyModLocation path basename hisuf
+ = do { obj_fn <- mkObjPath path basename ;
+ return (ModLocation{ ml_hspp_file = Nothing,
+ ml_hs_file = Nothing,
+ ml_hi_file = path ++ '/':basename ++ '.':hisuf,
+ -- Remove the .hi-boot suffix from
+ -- hi_file, if it had one. We always
+ -- want the name of the real .hi file
+ -- in the ml_hi_file field.
+ ml_obj_file = obj_fn
+ })}
+
+-- -----------------------------------------------------------------------------
+-- Constructing a home module location
+
+-- The .hi file always follows the module name, whereas the object
+-- file may follow the name of the source file in the case where the
+-- two differ (see summariseFile in compMan/CompManager.lhs).
+
+-- The source filename is specified in three components. For example,
+-- if we have a module "A.B.C" which was found along the patch "/P/Q/R"
+-- with extension ".hs", then the full filename is "/P/Q/R/A/B/C.hs". The
+-- components passed to mkHomeModLocation are
+--
+-- path: "/P/Q/R"
+-- basename: "A/B/C"
+-- extension: "hs"
+--
+-- the object file and interface file are constructed by possibly
+-- replacing the path component with the values of the -odir or the
+-- -hidr options respectively, and the extension with the values of
+-- the -osuf and -hisuf options respectively. That is, the basename
+-- always remains intact.
+--
+-- mkHomeModLocation is called directly by the compilation manager to
+-- construct the information for a root module. For a "root" module,
+-- the rules are slightly different. The filename is allowed to
+-- diverge from the module name, but we have to name the interface
+-- file after the module name. For example, a root module
+-- "/P/Q/R/foo.hs" will have components
+--
+-- path: "/P/Q/R"
+-- basename: "foo"
+-- extension: "hs"
+--
+-- and we set the flag is_root to True, to indicate that the basename
+-- portion for the .hi file should be replaced by the last component
+-- of the module name. eg. if the module name is "A.B.C" then basename
+-- will be replaced by "C" for the .hi file only, resulting in an
+-- .hi file like "/P/Q/R/C.hi" (subject to -hidir and -hisuf as usual).
+
+mkHomeModLocation mod_name is_root path basename extension = do
+
+ hisuf <- readIORef v_Hi_suf
+ hidir <- readIORef v_Hi_dir
+
+ obj_fn <- mkObjPath path basename
+
+ let -- hi filename
+ mod_str = moduleNameUserString mod_name
+ (_,mod_suf) = split_longest_prefix mod_str (=='.')
+
+ hi_basename
+ | is_root = mod_suf
+ | otherwise = basename
+
+ hi_path | Just d <- hidir = d
+ | otherwise = path
+ hi_fn = hi_path ++ '/':hi_basename ++ '.':hisuf
+
+ -- source filename (extension is always .hs or .lhs)
+ source_fn
+ | path == "." = basename ++ '.':extension
+ | otherwise = path ++ '/':basename ++ '.':extension
+
+ result = ( mkHomeModule mod_name,
+ ModLocation{ ml_hspp_file = Nothing,
+ ml_hs_file = Just source_fn,
+ ml_hi_file = hi_fn,
+ ml_obj_file = obj_fn,
+ })
+
+ addToFinderCache mod_name result
+ return result
+
+mkObjPath :: String -> FilePath -> IO FilePath
+-- Construct the filename of a .o file from the path/basename
+-- derived either from a .hs file or a .hi file.
+--
+-- Does *not* check whether the .o file exists
+mkObjPath path basename
+ = do odir <- readIORef v_Output_dir
+ osuf <- readIORef v_Object_suf
+ let obj_path | Just d <- odir = d
+ | otherwise = path
+ return (obj_path ++ '/':basename ++ '.':osuf)
+
+
+
+-- -----------------------------------------------------------------------------
+-- findLinkable isn't related to the other stuff in here,
+-- but there' no other obvious place for it
+
+findLinkable :: ModuleName -> ModLocation -> IO (Maybe Linkable)
+findLinkable mod locn
+ = do let obj_fn = ml_obj_file locn
+ obj_exist <- doesFileExist obj_fn
+ if not obj_exist
+ then return Nothing
+ else
+ do let stub_fn = case splitFilename3 obj_fn of
+ (dir, base, ext) -> dir ++ "/" ++ base ++ "_stub.o"
+ stub_exist <- doesFileExist stub_fn
+ obj_time <- getModificationTime obj_fn
+ if stub_exist
+ then return (Just (LM obj_time mod [DotO obj_fn, DotO stub_fn]))
+ else return (Just (LM obj_time mod [DotO obj_fn]))