X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fghci%2FLinker.lhs;h=8ad2be8d99e8b293204f45fa77c4f887e3f948ce;hb=a15972f1b72500a0bf0edca948314ea9fbc46ec3;hp=9fd39ef2424378dba6630aaf04eeb57f784a4127;hpb=81466110ff8104ca60e20d617bab83f6f78f0ec2;p=ghc-hetmet.git

diff --git a/compiler/ghci/Linker.lhs b/compiler/ghci/Linker.lhs
index 9fd39ef..8ad2be8 100644
--- a/compiler/ghci/Linker.lhs
+++ b/compiler/ghci/Linker.lhs
@@ -75,7 +75,7 @@ import System.FilePath
 import System.IO
 import System.Directory
 
-import Distribution.Package hiding (depends)
+import Distribution.Package hiding (depends, PackageId)
 
 import Exception
 import Data.Maybe
@@ -289,16 +289,17 @@ linkDependencies hsc_env span needed_mods = do
 
 -- | Temporarily extend the linker state.
 
-withExtendedLinkEnv :: [(Name,HValue)] -> IO a -> IO a
+withExtendedLinkEnv :: (MonadIO m, ExceptionMonad m) =>
+                       [(Name,HValue)] -> m a -> m a
 withExtendedLinkEnv new_env action
-    = bracket_ set_new_env
-               reset_old_env
-               action
+    = gbracket set_new_env
+               (\_ -> reset_old_env)
+               (\_ -> action)
     where set_new_env = do 
-            pls <- readIORef v_PersistentLinkerState
+            pls <- liftIO $ readIORef v_PersistentLinkerState
             let new_closure_env = extendClosureEnv (closure_env pls) new_env
                 new_pls = pls { closure_env = new_closure_env }
-            writeIORef v_PersistentLinkerState new_pls
+            liftIO $ writeIORef v_PersistentLinkerState new_pls
             return ()
 
         -- Remember that the linker state might be side-effected
@@ -306,7 +307,7 @@ withExtendedLinkEnv new_env action
         -- lose those changes (we might have linked a new module or
         -- package), so the reset action only removes the names we
         -- added earlier.
-          reset_old_env = do
+          reset_old_env = liftIO $ do
             modifyIORef v_PersistentLinkerState $ \pls ->
                 let cur = closure_env pls
                     new = delListFromNameEnv cur (map fst new_env)
@@ -456,21 +457,20 @@ preloadLib dflags lib_paths framework_paths lib_spec
   where
     preloadFailed :: String -> [String] -> LibrarySpec -> IO ()
     preloadFailed sys_errmsg paths spec
-       = do maybePutStr dflags
-    	       ("failed.\nDynamic linker error message was:\n   " 
-                    ++ sys_errmsg  ++ "\nWhilst trying to load:  " 
-                    ++ showLS spec ++ "\nDirectories to search are:\n"
-                    ++ unlines (map ("   "++) paths) )
-            give_up
+       = do maybePutStr dflags "failed.\n"
+            ghcError $
+	      CmdLineError (
+                    "user specified .o/.so/.DLL could not be loaded ("
+                    ++ sys_errmsg ++ ")\nWhilst trying to load:  "
+                    ++ showLS spec ++ "\nAdditional directories searched:"
+                    ++ (if null paths then " (none)" else
+                        (concat (intersperse "\n" (map ("   "++) paths)))))
     
     -- Not interested in the paths in the static case.
     preload_static _paths name
        = do b <- doesFileExist name
             if not b then return False
                      else loadObj name >> return True
-    
-    give_up = ghcError $ 
-	      CmdLineError "user specified .o/.so/.DLL could not be loaded."
 \end{code}