[project @ 2003-12-18 12:24:59 by simonmar]

[ghc-hetmet.git] / ghc / rts / MBlock.h

diff --git a/ghc/rts/MBlock.h b/ghc/rts/MBlock.h
index 3845ca4..f58c214 100644 (file)
--- a/ghc/rts/MBlock.h
+++ b/ghc/rts/MBlock.h
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: MBlock.h,v 1.15 2002/10/21 11:38:54 simonmar Exp $
+ * $Id: MBlock.h,v 1.19 2003/09/21 13:26:05 igloo Exp $
  *
  * (c) The GHC Team, 1998-1999
  *
@@ -49,26 +49,40 @@ extern void * getMBlocks(nat n);
    constant comparison).
    -------------------------------------------------------------------------- */
 
-#if SIZEOF_VOID_P == 4
-
-// This is the table.  Each byte is non-zero if the appropriate MBlock
-// in the address space contains heap.
 extern StgWord8 mblock_map[];
 
-#define HEAP_ALLOCED(p) \
-  ((int)(mblock_map[((StgWord)(p) & ~MBLOCK_MASK) >> MBLOCK_SHIFT]))
-
-#else // SIZEOF_VOID_P != 4
+#if SIZEOF_VOID_P == 4
+/* On a 32-bit machine a 4KB table is always sufficient */
+# define MBLOCK_MAP_SIZE       4096
+# define MBLOCK_MAP_ENTRY(p)   ((StgWord)(p) >> MBLOCK_SHIFT)
+# define HEAP_ALLOCED(p)       mblock_map[MBLOCK_MAP_ENTRY(p)]
+# define MARK_HEAP_ALLOCED(p)  (mblock_map[MBLOCK_MAP_ENTRY(p)] = 1)
+
+#elif defined(ia64_TARGET_ARCH)
+/* Instead of trying to cover the whole 64-bit address space (which would
+ * require a better data structure), we assume that mmap allocates mappings
+ * from the bottom of region 1, and track some portion of address space from
+ * there upwards (currently 4GB). */
+# define MBLOCK_MAP_SIZE       4096
+# define MBLOCK_MAP_ENTRY(p)   (((StgWord)(p) - (1UL << 61)) >> MBLOCK_SHIFT)
+# define HEAP_ALLOCED(p)       ((MBLOCK_MAP_ENTRY(p) < MBLOCK_MAP_SIZE) \
+                                       && mblock_map[MBLOCK_MAP_ENTRY(p)])
+# define MARK_HEAP_ALLOCED(p)  ((MBLOCK_MAP_ENTRY(p) < MBLOCK_MAP_SIZE) \
+                                       && (mblock_map[MBLOCK_MAP_ENTRY(p)] = 1))
+
+#elif SIZEOF_VOID_P == 8
+/* XXX: This is a HACK, and will not work in general!  We just use the
+ * lower 32 bits of the address, and do the same as for the 32-bit
+ * version.  As long as the OS gives us memory in a roughly linear
+ * fashion, it won't go wrong until we've allocated 4G.  */
+# define MBLOCK_MAP_SIZE       4096
+# define MBLOCK_MAP_ENTRY(p)   (((StgWord)(p) & 0xffffffff) >> MBLOCK_SHIFT)
+# define HEAP_ALLOCED(p)       (mblock_map[MBLOCK_MAP_ENTRY(p)])
+# define MARK_HEAP_ALLOCED(p)  (mblock_map[MBLOCK_MAP_ENTRY(p)] = 1)
 
-// on a 64-bit machine, we need to extend the above scheme to use a
-// 2-level mapping.  (ToDo)
 
-#ifdef TEXT_BEFORE_HEAP
-# define HEAP_ALLOCED(x)  ((StgPtr)(x) >= (StgPtr)(HEAP_BASE))
 #else
-#error HEAP_ALLOCED not defined
+# error HEAP_ALLOCED not defined
 #endif
 
-#endif // SIZEOF_VOID_P != 4
-
 #endif // __MBLOCK_H__