X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FBlock.h;h=d7599c5931de7a5d17eab0cec867f70e61bbe95e;hb=423d477bfecd490de1449c59325c8776f91d7aac;hp=f924a8e93f2e47717f4120ae5f84934a276f37f7;hpb=7f309f1c021e7583f724cce599ce2dd3c439361b;p=ghc-hetmet.git

diff --git a/ghc/includes/Block.h b/ghc/includes/Block.h
index f924a8e..d7599c5 100644
--- 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 1.17 2004/08/13 13:09:09 simonmar Exp $
  *
  * (c) The GHC Team, 1998-1999
  *
@@ -14,22 +14,29 @@
  * 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
@@ -40,21 +47,26 @@
  * on a 32-bit machine.
  */
 
-typedef struct _bdescr {
+#ifndef CMINUSMINUS
+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*/
-  struct _generation *gen;	/* generation */
+  struct bdescr_ *link;		/* used for chaining blocks together */
+  union { 
+      struct bdescr_ *back;	/* used (occasionally) for doubly-linked lists*/
+      StgWord *bitmap;
+  } u;
+  unsigned int gen_no;		/* 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 flags;              /* 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;
+#endif
 
 #if SIZEOF_VOID_P == 8
 #define BDESCR_SIZE  0x40
@@ -66,12 +78,41 @@ typedef struct _bdescr {
 #define BDESCR_SHIFT 5
 #endif
 
+/* Block contains objects evacuated during this GC */
+#define BF_EVACUATED 1
+/* Block is a large object */
+#define BF_LARGE     2
+/* Block is pinned */
+#define BF_PINNED    4
+/* Block is part of a compacted generation */
+#define BF_COMPACTED 8
+
+/* Finding the block descriptor for a given block -------------------------- */
+
+#ifdef CMINUSMINUS
+
+#define Bdescr(p) \
+    ((((p) &  MBLOCK_MASK & ~BLOCK_MASK) >> (BLOCK_SHIFT-BDESCR_SHIFT)) \
+     | ((p) & ~MBLOCK_MASK))
+
+#else
+
+INLINE_HEADER bdescr *Bdescr(StgPtr p)
+{
+  return (bdescr *)
+    ((((W_)p &  MBLOCK_MASK & ~BLOCK_MASK) >> (BLOCK_SHIFT-BDESCR_SHIFT)) 
+     | ((W_)p & ~MBLOCK_MASK)
+     );
+}
+
+#endif
+
 /* Useful Macros ------------------------------------------------------------ */
 
 /* 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 */
 
@@ -100,4 +141,20 @@ typedef struct _bdescr {
 #define BLOCKS_TO_MBLOCKS(n) \
    (1 + (W_)MBLOCK_ROUND_UP((n-BLOCKS_PER_MBLOCK) * BLOCK_SIZE) / MBLOCK_SIZE)
 
-#endif BLOCK_H
+
+/* Double-linked block lists: --------------------------------------------- */
+
+#ifndef CMINUSMINUS
+INLINE_HEADER void
+dbl_link_onto(bdescr *bd, bdescr **list)
+{
+  bd->link = *list;
+  bd->u.back = NULL;
+  if (*list) {
+    (*list)->u.back = bd; /* double-link the list */
+  }
+  *list = bd;
+}
+#endif
+
+#endif /* BLOCK_H */