Commit c9426889 authored by Edward Z. Yang's avatar Edward Z. Yang

Miscellaneous documentation for the Finder.

Signed-off-by: default avatarEdward Z. Yang <>
parent b6088689
......@@ -171,7 +171,12 @@ orIfNotFound this or_this = do
_other -> return res2
_other -> return res
-- | Helper function for 'findHomeModule': this function wraps an IO action
-- which would look up @mod_name@ in the file system (the home package),
-- and first consults the 'hsc_FC' cache to see if the lookup has already
-- been done. Otherwise, do the lookup (with the IO action) and save
-- the result in the finder cache and the module location cache (if it
-- was successful.)
homeSearchCache :: HscEnv -> ModuleName -> IO FindResult -> IO FindResult
homeSearchCache hsc_env mod_name do_this = do
m <- lookupFinderCache (hsc_FC hsc_env) mod_name
......@@ -234,7 +239,22 @@ uncacheModule hsc_env mod = do
-- -----------------------------------------------------------------------------
-- The internal workers
-- | Search for a module in the home package only.
-- | Implements the search for a module name in the home package only. Calling
-- this function directly is usually *not* what you want; currently, it's used
-- as a building block for the following operations:
-- 1. When you do a normal package lookup, we first check if the module
-- is available in the home module, before looking it up in the package
-- database.
-- 2. When you have a package qualified import with package name "this",
-- we shortcut to the home module.
-- 3. When we look up an exact 'Module', if the package key associated with
-- the module is the current home module do a look up in the home module.
-- 4. Some special-case code in GHCi (ToDo: Figure out why that needs to
-- call this.)
findHomeModule :: HscEnv -> ModuleName -> IO FindResult
findHomeModule hsc_env mod_name =
homeSearchCache hsc_env mod_name $
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