/* -----------------------------------------------------------------------------
- * $Id: Block.h,v 1.9 2001/07/23 17:23:19 simonmar Exp $
+ * $Id: Block.h,v 1.13 2003/03/28 15:13:52 sof Exp $
*
* (c) The GHC Team, 1998-1999
*
* includes/Constants.h, all constants here are derived from these.
*/
-/* Block related constants (4k blocks) */
+/* Block related constants (BLOCK_SHIFT is defined in Constants.h) */
+#define BLOCK_SIZE (1<<BLOCK_SHIFT)
#define BLOCK_SIZE_W (BLOCK_SIZE/sizeof(W_))
#define BLOCK_MASK (BLOCK_SIZE-1)
#define BLOCK_ROUND_UP(p) ((void *) (((W_)(p)+BLOCK_SIZE-1) & ~BLOCK_MASK))
#define BLOCK_ROUND_DOWN(p) ((void *) ((W_)(p) & ~BLOCK_MASK))
-/* Megablock related constants (1M megablocks) */
+/* Megablock related constants (MBLOCK_SHIFT is defined in Constants.h) */
+#define MBLOCK_SIZE (1<<MBLOCK_SHIFT)
#define MBLOCK_SIZE_W (MBLOCK_SIZE/sizeof(W_))
#define MBLOCK_MASK (MBLOCK_SIZE-1)
#define MBLOCK_ROUND_UP(p) ((void *)(((W_)(p)+MBLOCK_SIZE-1) & ~MBLOCK_MASK))
#define MBLOCK_ROUND_DOWN(p) ((void *)((W_)(p) & ~MBLOCK_MASK ))
+/* The largest size an object can be before we give it a block of its
+ * own and treat it as an immovable object during GC, expressed as a
+ * fraction of BLOCK_SIZE.
+ */
+#define LARGE_OBJECT_THRESHOLD ((nat)(BLOCK_SIZE * 8 / 10))
/* -----------------------------------------------------------------------------
* Block descriptor. This structure *must* be the right length, so we
/* Offset of first real data block in a megablock */
#define FIRST_BLOCK_OFF \
- ((W_)BLOCK_ROUND_UP(MBLOCK_SIZE / BLOCK_SIZE * BDESCR_SIZE))
+ ((W_)BLOCK_ROUND_UP(BDESCR_SIZE * (MBLOCK_SIZE / BLOCK_SIZE)))
/* First data block in a given megablock */