exploring two fingers

diff --git a/src/MarkCompact/TwoFinger.hs b/src/MarkCompact/TwoFinger.hs
index 50f4204299934c14185f7e189bb6453999ccc714..1cc174c780e2db4b3e55862acfbfb54b4c5dc94e 100644 (file)
--- a/src/MarkCompact/TwoFinger.hs
+++ b/src/MarkCompact/TwoFinger.hs
@@ -4,6 +4,7 @@
 
 module MarkCompact.TwoFinger where
 
+import Debug.Trace 
 import Data.List (sortBy)
 import Data.Function (on)
 import Data.Array
@@ -145,6 +146,7 @@ markFromRoots = do
 
 collect :: GcM ()
 collect = do
+  traceShowM "mark!!!"
   markFromRoots
   compact
 
@@ -171,13 +173,13 @@ relocate start end = go start end
         let indicesToUnmark = fmap fst $ takeWhile (\(_, marked) -> marked) $ assocs bm 
             free' = if indicesToUnmark == [] then free else maximum indicesToUnmark
             bm' = bm // [(i, False) | i <- indicesToUnmark] 
-        put $ gc { bitmap = bm' }
+        put $ gc { bitmap = traceShow (free', indicesToUnmark) bm' }
 
         let
           findIndexStep marked (ok, idx)
             | not marked && idx > free' = (ok, idx - 1)
             | otherwise = (True, idx) 
-          scan' = snd $ foldr findIndexStep (False, scan) bm
+          scan' = snd $ foldr findIndexStep (False, scan) bm'
     
         if scan' > free' then do
           put $ gc { bitmap = bm' // [(scan', False)]}
@@ -217,6 +219,9 @@ main = do
   let
     res = flip runState initState $ unGcM $ do
         ptr <- new (IntVal 1)
+
+        writeToRoots 1 ptr 
+
         ptr2 <- new (IntVal 2) 
         ptr3 <- new (IntVal 3) 
         ptr4 <- new (IntVal 4) 
@@ -225,7 +230,6 @@ main = do
         ptr7 <- new (IntVal 7) 
         ptr8 <- new (IntVal 8) 
 
-        writeToRoots 1 ptr 
 
         collect