[project @ 2001-07-23 17:23:19 by simonmar]

[ghc-hetmet.git] / ghc / includes / Block.h

diff --git a/ghc/includes/Block.h b/ghc/includes/Block.h
index d6bfdfe..599dc27 100644 (file)
--- a/ghc/includes/Block.h
+++ b/ghc/includes/Block.h
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: Block.h,v 1.8 2001/07/23 10:47:16 simonmar Exp $
+ * $Id: Block.h,v 1.9 2001/07/23 17:23:19 simonmar Exp $
  *
  * (c) The GHC Team, 1998-1999
  *
@@ -44,11 +44,14 @@ typedef struct _bdescr {
   StgPtr start;                        /* start addr of memory */
   StgPtr free;                 /* first free byte of memory */
   struct _bdescr *link;                /* used for chaining blocks together */
-  struct _bdescr *back;                /* used (occasionally) for doubly-linked lists*/
+  union { 
+      struct _bdescr *back;    /* used (occasionally) for doubly-linked lists*/
+      StgWord *bitmap;
+  } u;
   unsigned int gen_no;         /* generation */
   struct _step *step;          /* step */
   StgWord32 blocks;            /* no. of blocks (if grp head, 0 otherwise) */
-  StgWord32 evacuated;           /* block is in to-space */
+  StgWord32 flags;              /* block is in to-space */
 #if SIZEOF_VOID_P == 8
   StgWord32 _padding[2];
 #else
@@ -66,6 +69,9 @@ typedef struct _bdescr {
 #define BDESCR_SHIFT 5
 #endif
 
+#define BF_EVACUATED 1
+#define BF_LARGE     2
+
 /* Finding the block descriptor for a given block -------------------------- */
 
 static inline bdescr *Bdescr(StgPtr p)