[project @ 2001-07-30 12:57:01 by simonmar]

[ghc-hetmet.git] / ghc / rts / GCCompact.c

diff --git a/ghc/rts/GCCompact.c b/ghc/rts/GCCompact.c
index b3f4fb7..9ddd414 100644 (file)
--- a/ghc/rts/GCCompact.c
+++ b/ghc/rts/GCCompact.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: GCCompact.c,v 1.4 2001/07/25 11:55:57 simonmar Exp $
+ * $Id: GCCompact.c,v 1.5 2001/07/30 12:57:01 simonmar Exp $
  *
  * (c) The GHC Team 2001
  *
@@ -723,8 +723,15 @@ update_fwd_compact( bdescr *blocks )
 
            size = p - q;
            if (free + size > free_bd->start + BLOCK_SIZE_W) {
+               // unset the next bit in the bitmap to indicate that
+               // this object needs to be pushed into the next
+               // block.  This saves us having to run down the
+               // threaded info pointer list twice during the next pass.
+               unmark(q+1,bd);
                free_bd = free_bd->link;
                free = free_bd->start;
+           } else {
+               ASSERT(is_marked(q+1,bd));
            }
 
            unthread(q,free);
@@ -784,15 +791,7 @@ update_bkwd_compact( step *stp )
            }
 #endif
 
-           // must unthread before we look at the info ptr...
-           info = get_threaded_info(p);
-
-           ASSERT(p && (LOOKS_LIKE_GHC_INFO(info)
-                        || IS_HUGS_CONSTR_INFO(info)));
-
-           size = obj_sizeW((StgClosure *)p,info);
-
-           if (free + size > free_bd->start + BLOCK_SIZE_W) {
+           if (!is_marked(p+1,bd)) {
                // don't forget to update the free ptr in the block desc.
                free_bd->free = free;
                free_bd = free_bd->link;
@@ -801,6 +800,12 @@ update_bkwd_compact( step *stp )
            }
 
            unthread(p,free);
+           info = get_itbl((StgClosure *)p);
+           size = obj_sizeW((StgClosure *)p,info);
+
+           ASSERT(p && (LOOKS_LIKE_GHC_INFO(info)
+                        || IS_HUGS_CONSTR_INFO(info)));
+
            if (free != p) {
                move(free,p,size);
            }