X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Frts%2FBlockAlloc.c;h=9d13719918c13fe974f07695a9f0d811200945ce;hb=6e5df3a4551b8d8b83e936b3f7b52edfc778ca8a;hp=220928520ed8f264a0d122518d8420511014bfb2;hpb=18b3cd979a185d02c88df1de61814ed808c62010;p=ghc-hetmet.git

diff --git a/ghc/rts/BlockAlloc.c b/ghc/rts/BlockAlloc.c
index 2209285..9d13719 100644
--- a/ghc/rts/BlockAlloc.c
+++ b/ghc/rts/BlockAlloc.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: BlockAlloc.c,v 1.11 2001/11/08 10:18:49 simonmar Exp $
+ * $Id: BlockAlloc.c,v 1.14 2002/07/17 09:21:49 simonmar Exp $
  *
  * (c) The GHC Team 1998-2000
  * 
@@ -23,6 +23,8 @@
 #include "BlockAlloc.h"
 #include "MBlock.h"
 
+#include <string.h>
+
 static void    initMBlock(void *mblock);
 static bdescr *allocMegaGroup(nat mblocks);
 static void    freeMegaGroup(bdescr *bd);
@@ -196,15 +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;
@@ -302,6 +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)
 {
@@ -312,6 +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);