[project @ 2000-05-15 14:49:47 by simonmar]

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

diff --git a/ghc/includes/Block.h b/ghc/includes/Block.h
index f924a8e..bf21ba3 100644 (file)
--- a/ghc/includes/Block.h
+++ b/ghc/includes/Block.h
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: Block.h,v 1.4 1999/02/05 16:02:19 simonm Exp $
+ * $Id: Block.h,v 1.7 2000/04/05 14:26:31 panne Exp $
  *
  * (c) The GHC Team, 1998-1999
  *
@@ -47,12 +47,12 @@ typedef struct _bdescr {
   struct _bdescr *back;                /* used (occasionally) for doubly-linked lists*/
   struct _generation *gen;     /* generation */
   struct _step *step;          /* step */
-  StgNat32 blocks;             /* no. of blocks (if grp head, 0 otherwise) */
-  StgNat32 evacuated;           /* block is in to-space */
+  StgWord32 blocks;            /* no. of blocks (if grp head, 0 otherwise) */
+  StgWord32 evacuated;           /* block is in to-space */
 #if SIZEOF_VOID_P == 8
-  StgNat32 _padding[2];
+  StgWord32 _padding[2];
 #else
-  StgNat32 _padding[0];
+  StgWord32 _padding[0];
 #endif
 } bdescr;
 
@@ -66,6 +66,16 @@ typedef struct _bdescr {
 #define BDESCR_SHIFT 5
 #endif
 
+/* Finding the block descriptor for a given block -------------------------- */
+
+static inline bdescr *Bdescr(StgPtr p)
+{
+  return (bdescr *)
+    ((((W_)p &  MBLOCK_MASK & ~BLOCK_MASK) >> (BLOCK_SHIFT-BDESCR_SHIFT)) 
+     | ((W_)p & ~MBLOCK_MASK)
+     );
+}
+
 /* Useful Macros ------------------------------------------------------------ */
 
 /* Offset of first real data block in a megablock */
@@ -100,4 +110,4 @@ typedef struct _bdescr {
 #define BLOCKS_TO_MBLOCKS(n) \
    (1 + (W_)MBLOCK_ROUND_UP((n-BLOCKS_PER_MBLOCK) * BLOCK_SIZE) / MBLOCK_SIZE)
 
-#endif BLOCK_H
+#endif /* BLOCK_H */