X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2Fsm%2FBlockAlloc.c;h=280ebfc7dbdfb94bbe3f5757771572916b34fe8d;hb=1c45176f3b9be75b5c4744d9ef074430bf034e3f;hp=81baf6c19694d7ff2b989a1a5e82112b13a81f48;hpb=a57e55b095c48d8ca27b2ec13f4d138655618577;p=ghc-hetmet.git

diff --git a/rts/sm/BlockAlloc.c b/rts/sm/BlockAlloc.c
index 81baf6c..280ebfc 100644
--- a/rts/sm/BlockAlloc.c
+++ b/rts/sm/BlockAlloc.c
@@ -565,6 +565,9 @@ freeChain_lock(bdescr *bd)
     RELEASE_SM_LOCK;
 }
 
+// splitBlockGroup(bd,B) splits bd in two.  Afterward, bd will have B
+// blocks, and a new block descriptor pointing to the remainder is
+// returned.
 bdescr *
 splitBlockGroup (bdescr *bd, nat blocks)
 {
@@ -575,16 +578,21 @@ splitBlockGroup (bdescr *bd, nat blocks)
     }
 
     if (bd->blocks > BLOCKS_PER_MBLOCK) {
-        nat mblocks;
+        nat low_mblocks, high_mblocks;
         void *new_mblock;
         if ((blocks - BLOCKS_PER_MBLOCK) % (MBLOCK_SIZE / BLOCK_SIZE) != 0) {
             barf("splitLargeBlock: not a multiple of a megablock");
         }
-        mblocks = 1 + (blocks - BLOCKS_PER_MBLOCK) / (MBLOCK_SIZE / BLOCK_SIZE);
-        new_mblock = (void *) ((P_)MBLOCK_ROUND_DOWN(bd) + mblocks * MBLOCK_SIZE_W);
+        low_mblocks = 1 + (blocks - BLOCKS_PER_MBLOCK) / (MBLOCK_SIZE / BLOCK_SIZE);
+        high_mblocks = (bd->blocks - blocks) / (MBLOCK_SIZE / BLOCK_SIZE);
+
+        new_mblock = (void *) ((P_)MBLOCK_ROUND_DOWN(bd) + low_mblocks * MBLOCK_SIZE_W);
         initMBlock(new_mblock);
         new_bd = FIRST_BDESCR(new_mblock);
-        new_bd->blocks = MBLOCK_GROUP_BLOCKS(mblocks);
+        new_bd->blocks = MBLOCK_GROUP_BLOCKS(high_mblocks);
+
+        ASSERT(blocks + new_bd->blocks == 
+               bd->blocks + BLOCKS_PER_MBLOCK - MBLOCK_SIZE/BLOCK_SIZE);
     }
     else
     {
@@ -727,4 +735,36 @@ countFreeList(void)
   }
   return total_blocks;
 }
+
+void
+markBlocks (bdescr *bd)
+{
+    for (; bd != NULL; bd = bd->link) {
+        bd->flags |= BF_KNOWN;
+    }
+}
+
+void
+reportUnmarkedBlocks (void)
+{
+    void *mblock;
+    bdescr *bd;
+
+    debugBelch("Unreachable blocks:\n");
+    for (mblock = getFirstMBlock(); mblock != NULL;
+         mblock = getNextMBlock(mblock)) {
+        for (bd = FIRST_BDESCR(mblock); bd <= LAST_BDESCR(mblock); ) {
+            if (!(bd->flags & BF_KNOWN) && bd->free != (P_)-1) {
+                debugBelch("  %p\n",bd);
+            }
+            if (bd->blocks >= BLOCKS_PER_MBLOCK) {
+                mblock += (BLOCKS_TO_MBLOCKS(bd->blocks) - 1) * MBLOCK_SIZE;
+                break;
+            } else {
+                bd += bd->blocks;
+            }
+        }
+    }
+}
+
 #endif