Fixes to use $fptools-compatible Dynamic

TODO

@@ -1,6 +1,8 @@
 For 0.1
 ----------
 
++ Cascading unload/reload
+
 + have eval, printf return errors as arguments, not to stdout
 
 + nice functions for cleaning up /tmp files, given a module name

examples/eval/eval3/Main.hs

@@ -10,24 +10,25 @@
 
 #include "../../../config.h"
 
-import System.Eval.Haskell
+import System.Eval
 import AltData.Dynamic
 
--- import Data.Dynamic
-
 pkgconf = TOP ++ "/plugins.conf.inplace"
 
 main = do
-    a <- return $ toDyn (3::Int)
-
-    m_b <- unsafeEval_ "\\dyn -> fromMaybe (7 :: Int) (fromDyn dyn)"
-                ["AltData.Dynamic","Data.Maybe"]  -- imports
+    a <- return $ toDyn (3::Integer)
 
+    -- so, we try to compile a function that takes a dyn.
+    -- looks like with GHC 6.4, we need to make sure the package.confs work:
+    m_b <- unsafeEval_ "\\dyn -> fromDyn dyn (7 :: Integer)"
+                ["AltData.Dynamic"]
                 [ "-package-conf "++pkgconf , "-package altdata" ]
-
                 [ pkgconf ]
                 []
 
+    case m_b of 
+        Left s   -> mapM_ putStrLn s
+        Right b  -> putStrLn $ show (b a :: Integer) -- now apply it
                 
 {-
 -- should work, but doesn't. type check fails 
@@ -37,6 +38,3 @@ main = do
                                 ["Data.Dynamic","Data.Maybe"] [] []
 -}
 
-    case m_b of 
-        Left s   -> mapM_ putStrLn s
-        Right b  -> putStrLn $ show (b a :: Int)

src/altdata/AltData/Dynamic.hs

@@ -1,4 +1,4 @@
-{-# OPTIONS_GHC -fno-implicit-prelude #-}
+{-# OPTIONS -fglasgow-exts -cpp #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Data.Dynamic
@@ -18,11 +18,10 @@
 -- 
 -----------------------------------------------------------------------------
 
-module Data.Dynamic
-  (
+module AltData.Dynamic (
 
 	-- Module Data.Typeable re-exported for convenience
-	module Data.Typeable,
+	module AltData.Typeable,
 
 	-- * The @Dynamic@ type
 	Dynamic,	-- abstract, instance of: Show, Typeable
@@ -39,35 +38,17 @@ module Data.Dynamic
 
   ) where
 
-
 import AltData.Typeable
 import Data.Maybe
 
-#ifdef __GLASGOW_HASKELL__
+import System.IO.Unsafe    (unsafePerformIO)
+
 import GHC.Base
 import GHC.Show
 import GHC.Err
-import GHC.Num
-#endif
 
-#ifdef __HUGS__
-import Hugs.Prelude
-import Hugs.IO
-import Hugs.IORef
-import Hugs.IOExts
-#endif
-
-#ifdef __GLASGOW_HASKELL__
 unsafeCoerce :: a -> b
 unsafeCoerce = unsafeCoerce#
-#endif
-
-#ifdef __NHC__
-import NonStdUnsafeCoerce (unsafeCoerce)
-import NHC.IOExtras (IORef,newIORef,readIORef,writeIORef,unsafePerformIO)
-#endif
-
-#include "Typeable.h"
 
 -------------------------------------------------------------
 --
@@ -85,11 +66,14 @@ import NHC.IOExtras (IORef,newIORef,readIORef,writeIORef,unsafePerformIO)
   'Show'ing a value of type 'Dynamic' returns a pretty-printed representation
   of the object\'s type; useful for debugging.
 -}
-#ifndef __HUGS__
 data Dynamic = Dynamic TypeRep Obj
-#endif
 
-INSTANCE_TYPEABLE0(Dynamic,dynamicTc,"Dynamic")
+instance Typeable Dynamic where
+#if __GLASGOW_HASKELL__ >= 603
+    typeOf _ = mkTyConApp (mkTyCon "AltData.Dynamic") []
+#else
+    typeOf _ = mkAppTy    (mkTyCon "AltData.Dynamic") []
+#endif
 
 instance Show Dynamic where
    -- the instance just prints the type representation.
@@ -98,7 +82,6 @@ instance Show Dynamic where
 	  showsPrec 0 t   . 
 	  showString ">>"
 
-#ifdef __GLASGOW_HASKELL__
 type Obj = forall a . a
  -- Dummy type to hold the dynamically typed value.
  --
@@ -109,9 +92,6 @@ type Obj = forall a . a
  -- the other hand, if we use a polymorphic type, GHC will use
  -- a fallback convention for evaluating it that works for all types.
  -- (using a function type here would also work).
-#elif !defined(__HUGS__)
-data Obj = Obj
-#endif
 
 -- | Converts an arbitrary value into an object of type 'Dynamic'.  
 --
@@ -148,7 +128,12 @@ fromDynamic
 fromDynamic (Dynamic t v) =
   case unsafeCoerce v of 
     r | t == typeOf r -> Just r
-      | otherwise     -> Nothing
+      | otherwise     -> unsafePerformIO (putStrLn $
+                                "Couldn't match `"    ++show(typeOf r) ++
+                                        "' against `" ++show t         ++"'"++
+                                "\n\tExpected type: " ++show(typeOf r) ++
+                                "\n\tInferred type: " ++show t
+                        ) `seq` Nothing
 
 -- (f::(a->b)) `dynApply` (x::a) = (f a)::b
 dynApply :: Dynamic -> Dynamic -> Maybe Dynamic

src/build.mk

@@ -67,6 +67,10 @@ depend: $(ALL_SRCS)
 %.$(way_)o: %.hs
 	$(GHC) $(HC_OPTS) -c $< -o $@ -ohi $(basename $@).$(way_)hi
 
+# Now a rule for hs-boot files. 
+%.$(way_)o-boot : %.hs-boot
+	$(GHC) $(HC_OPTS) $(PKG_OPTS) -c $< -o $@  -ohi $(basename $@).$(way_)hi-boot
+
 # happy files
 $(YOBJ): $(YSRC)
 	$(HAPPY) $(HAPPY_OPTS) -o $@ $(YSRC)

src/plugins/System/Eval/Haskell.hs

@@ -42,7 +42,7 @@ import System.Eval.Utils
 import System.Plugins.Make
 import System.Plugins.Load
 
-import AltData.Dynamic
+import AltData.Dynamic             ( Dynamic )
 import AltData.Typeable            ( Typeable )
 
 import Data.Either

src/plugins/System/Plugins/Load.hs

@@ -54,7 +54,7 @@ import System.Plugins.Consts           ( sysPkgSuffix, hiSuf, prefixUnderscore )
 
 import Language.Hi.Parser
 
-import AltData.Dynamic          ( fromDyn, Dynamic )
+import AltData.Dynamic          ( fromDynamic, Dynamic )
 import AltData.Typeable         ( Typeable )
 
 import Data.List                ( isSuffixOf, nub, nubBy )
@@ -161,7 +161,7 @@ dynload obj incpaths pkgconfs sym = do
     s <- load obj incpaths pkgconfs sym
     case s of e@(LoadFailure _)   -> return e
               LoadSuccess m dyn_v -> return $
-                    case fromDyn (unsafeCoerce# dyn_v :: Dynamic) of
+                    case fromDynamic (unsafeCoerce# dyn_v :: Dynamic) of
                         Just v' -> LoadSuccess m v'
                         Nothing -> LoadFailure ["Mismatched types in interface"]