1 files changed, 26 insertions, 0 deletions
diff --git a/compiler/utils/Binary.hs b/compiler/utils/Binary.hs
index c5a2c8f4fd..b61b2838ee 100644
--- a/compiler/utils/Binary.hs
+++ b/compiler/utils/Binary.hs
@@ -30,7 +30,9 @@ module Binary
 
    writeBinMem,
    readBinMem,
+
    fingerprintBinMem,
+   computeFingerprint,
 
    isEOFBin,
 
@@ -74,6 +76,9 @@ import Data.Array
 import Data.IORef
 import Data.Char                ( ord, chr )
 import Data.Typeable
+#if __GLASGOW_HASKELL__ >= 701
+import Data.Typeable.Internal
+#endif
 import Control.Monad            ( when )
 import System.IO as IO
 import System.IO.Unsafe         ( unsafeInterleaveIO )
@@ -237,6 +242,18 @@ fingerprintBinMem (BinMem _ ix_r _ arr_r) = do
   ix <- readFastMutInt ix_r
   withForeignPtr arr $ \p -> fingerprintData p ix
 
+computeFingerprint :: Binary a
+                   => (BinHandle -> Name -> IO ())
+                   -> a
+                   -> IO Fingerprint
+
+computeFingerprint put_name a = do
+  bh <- openBinMem (3*1024) -- just less than a block
+  ud <- newWriteState put_name putFS
+  bh <- return $ setUserData bh ud
+  put_ bh a
+  fingerprintBinMem bh
+
 -- expand the size of the array to include a specified offset
 expandBin :: BinHandle -> Int -> IO ()
 expandBin (BinMem _ _ sz_r arr_r) off = do
@@ -562,6 +579,14 @@ instance Binary (Bin a) where
 -- -----------------------------------------------------------------------------
 -- Instances for Data.Typeable stuff
 
+#if __GLASGOW_HASKELL__ >= 701
+instance Binary TyCon where
+    put_ bh (TyCon _ p m n) = do
+        put_ bh (p,m,n)
+    get bh = do
+        (p,m,n) <- get bh
+        return (mkTyCon3 p m n)
+#else
 instance Binary TyCon where
     put_ bh ty_con = do
         let s = tyConString ty_con
@@ -569,6 +594,7 @@ instance Binary TyCon where
     get bh = do
         s <- get bh
         return (mkTyCon s)
+#endif
 
 instance Binary TypeRep where
     put_ bh type_rep = do