/* -----------------------------------------------------------------------------
- * $Id: Block.h,v 1.5 1999/03/02 19:44:07 sof Exp $
+ * $Id: Block.h,v 1.10 2001/10/03 13:57:42 simonmar Exp $
*
* (c) The GHC Team, 1998-1999
*
/* Block related constants (4k blocks) */
+#define BLOCK_SIZE (1<<BLOCK_SHIFT)
#define BLOCK_SIZE_W (BLOCK_SIZE/sizeof(W_))
#define BLOCK_MASK (BLOCK_SIZE-1)
/* Megablock related constants (1M megablocks) */
+#define MBLOCK_SIZE (1<<MBLOCK_SHIFT)
#define MBLOCK_SIZE_W (MBLOCK_SIZE/sizeof(W_))
#define MBLOCK_MASK (MBLOCK_SIZE-1)
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*/
- struct _generation *gen; /* generation */
+ 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
#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)
+{
+ 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 */
#define BLOCKS_TO_MBLOCKS(n) \
(1 + (W_)MBLOCK_ROUND_UP((n-BLOCKS_PER_MBLOCK) * BLOCK_SIZE) / MBLOCK_SIZE)
-#endif BLOCK_H
+#endif /* BLOCK_H */