Use explicit language extensions & remove extension fields from base.cabal

[ghc-base.git] / Foreign / Marshal / Array.hs

diff --git a/Foreign/Marshal/Array.hs b/Foreign/Marshal/Array.hs
index 8e013fe..1ca3e9e 100644 (file)
--- a/Foreign/Marshal/Array.hs
+++ b/Foreign/Marshal/Array.hs
@@ -1,4 +1,5 @@
-{-# OPTIONS_GHC -XNoImplicitPrelude #-}
+{-# LANGUAGE CPP, NoImplicitPrelude, MagicHash #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Foreign.Marshal.Array
@@ -63,8 +64,8 @@ module Foreign.Marshal.Array (
 ) where
 
 import Foreign.Ptr      (Ptr, plusPtr)
-import Foreign.Storable (Storable(sizeOf,peekElemOff,pokeElemOff))
-import Foreign.Marshal.Alloc (mallocBytes, allocaBytes, reallocBytes)
+import Foreign.Storable (Storable(alignment,sizeOf,peekElemOff,pokeElemOff))
+import Foreign.Marshal.Alloc (mallocBytes, allocaBytesAligned, reallocBytes)
 import Foreign.Marshal.Utils (copyBytes, moveBytes)
 
 #ifdef __GLASGOW_HASKELL__
@@ -101,7 +102,8 @@ allocaArray :: Storable a => Int -> (Ptr a -> IO b) -> IO b
 allocaArray  = doAlloca undefined
   where
     doAlloca            :: Storable a' => a' -> Int -> (Ptr a' -> IO b') -> IO b'
-    doAlloca dummy size  = allocaBytes (size * sizeOf dummy)
+    doAlloca dummy size  = allocaBytesAligned (size * sizeOf dummy)
+                                              (alignment dummy)
 
 -- |Like 'allocaArray', but add an extra position to hold a special
 -- termination element.
@@ -129,10 +131,8 @@ reallocArray0 ptr size  = reallocArray ptr (size + 1)
 -- marshalling
 -- -----------
 
--- |Convert an array of given length into a Haskell list.  This version
--- traverses the array backwards using an accumulating parameter,
--- which uses constant stack space.  The previous version using mapM
--- needed linear stack space.
+-- |Convert an array of given length into a Haskell list.  The implementation
+-- is tail-recursive and so uses constant stack space.
 --
 peekArray          :: Storable a => Int -> Ptr a -> IO [a]
 peekArray size ptr | size <= 0 = return []