X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FBlock.h;h=1f84f78f588b6252db13badd12c477a1f2e0c459;hb=560bf0f68bdfd422c9d744a83ca38ec0a4bc780c;hp=b8a0260a7a9b748ddf284b39456e8977925801c7;hpb=438596897ebbe25a07e1c82085cfbc5bdb00f09e;p=ghc-hetmet.git

diff --git a/ghc/includes/Block.h b/ghc/includes/Block.h
index b8a0260..1f84f78 100644
--- a/ghc/includes/Block.h
+++ b/ghc/includes/Block.h
@@ -1,5 +1,7 @@
 /* -----------------------------------------------------------------------------
- * $Id: Block.h,v 1.2 1998/12/02 13:20:53 simonm Exp $
+ * $Id: Block.h,v 1.10 2001/10/03 13:57:42 simonmar Exp $
+ *
+ * (c) The GHC Team, 1998-1999
  *
  * Block structure for the storage manager
  *
@@ -14,6 +16,7 @@
 
 /* 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)
 
@@ -22,6 +25,7 @@
 
 /* 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)
 
@@ -42,14 +46,18 @@ 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*/
-  StgNat32 gen;			/* generation */
-  StgNat32 step;		/* step */
-  StgNat32 blocks;		/* no. of blocks (if grp head, 0 otherwise) */
+  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 flags;              /* block is in to-space */
 #if SIZEOF_VOID_P == 8
-  StgNat32 _padding[5];
+  StgWord32 _padding[2];
 #else
-  StgNat32 _padding[1];
+  StgWord32 _padding[0];
 #endif
 } bdescr;
 
@@ -63,6 +71,19 @@ 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)
+{
+  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 */
@@ -97,4 +118,4 @@ 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 */