[project @ 2002-12-05 23:49:43 by mthomas]

[ghc-hetmet.git] / ghc / rts / BlockAlloc.c

diff --git a/ghc/rts/BlockAlloc.c b/ghc/rts/BlockAlloc.c
index 6819463..9d13719 100644 (file)
--- a/ghc/rts/BlockAlloc.c
+++ b/ghc/rts/BlockAlloc.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: BlockAlloc.c,v 1.7 2000/01/30 10:17:44 simonmar Exp $
+ * $Id: BlockAlloc.c,v 1.14 2002/07/17 09:21:49 simonmar Exp $
  *
  * (c) The GHC Team 1998-2000
  * 
@@ -16,12 +16,15 @@
  *
  * ---------------------------------------------------------------------------*/
 
+#include "PosixSource.h"
 #include "Rts.h"
 #include "RtsFlags.h"
 #include "RtsUtils.h"
 #include "BlockAlloc.h"
 #include "MBlock.h"
 
+#include <string.h>
+
 static void    initMBlock(void *mblock);
 static bdescr *allocMegaGroup(nat mblocks);
 static void    freeMegaGroup(bdescr *bd);
@@ -52,6 +55,7 @@ initGroup(nat n, bdescr *head)
     head->free = head->start;
     for (i=1, bd = head+1; i < n; i++, bd++) {
       bd->free = 0;
+      bd->blocks = 0;
       bd->link = head;
     }
   }
@@ -63,6 +67,8 @@ allocGroup(nat n)
   void *mblock;
   bdescr *bd, **last;
 
+  ASSERT(n != 0);
+
   if (n > BLOCKS_PER_MBLOCK) {
     return allocMegaGroup(BLOCKS_TO_MBLOCKS(n));
   }
@@ -192,15 +198,17 @@ static inline bdescr *
 coalesce(bdescr *p)
 {
   bdescr *bd, *q;
-  nat i;
+  nat i, blocks;
 
   q = p->link;
   if (q != NULL && p->start + p->blocks * BLOCK_SIZE_W == q->start) {
     /* can coalesce */
     p->blocks += q->blocks;
     p->link    = q->link;
-    for (i = 0, bd = q; i < q->blocks; bd++, i++) {
+    blocks = q->blocks;
+    for (i = 0, bd = q; i < blocks; bd++, i++) {
        bd->free = 0;
+       bd->blocks = 0;
        bd->link = p;
     }
     return p;
@@ -222,7 +230,7 @@ freeGroup(bdescr *p)
 #ifdef DEBUG
   p->free = (void *)-1;  /* indicates that this block is free */
   p->step = NULL;
-  p->gen  = NULL;
+  p->gen_no = 0;
   /* fill the block group with garbage if sanity checking is on */
   IF_DEBUG(sanity,memset(p->start, 0xaa, p->blocks * BLOCK_SIZE));
 #endif
@@ -298,6 +306,18 @@ initMBlock(void *mblock)
    -------------------------------------------------------------------------- */
 
 #ifdef DEBUG
+static void
+checkWellFormedGroup( bdescr *bd )
+{
+    nat i;
+
+    for (i = 1; i < bd->blocks; i++) {
+       ASSERT(bd[i].blocks == 0);
+       ASSERT(bd[i].free   == 0);
+       ASSERT(bd[i].link   == bd);
+    }
+}
+
 void
 checkFreeListSanity(void)
 {
@@ -308,6 +328,7 @@ checkFreeListSanity(void)
             fprintf(stderr,"group at 0x%x, length %d blocks\n", 
                     (nat)bd->start, bd->blocks));
     ASSERT(bd->blocks > 0);
+    checkWellFormedGroup(bd);
     if (bd->link != NULL) {
       /* make sure we're fully coalesced */
       ASSERT(bd->start + bd->blocks * BLOCK_SIZE_W != bd->link->start);