Commit c3ddb90b authored by simonmar's avatar simonmar

[project @ 2000-09-04 15:17:03 by simonmar]

- debugging: print weights as unsigned
- clean up getStablePtr a bit
- correct a comment
parent 4c0ca9cf
/* -----------------------------------------------------------------------------
* $Id: Stable.c,v 1.12 2000/09/04 15:08:42 simonmar Exp $
* $Id: Stable.c,v 1.13 2000/09/04 15:17:03 simonmar Exp $
*
* (c) The GHC Team, 1998-1999
*
......@@ -107,7 +107,7 @@ unsigned int SPT_size;
*
* A stable pointer has a weighted reference count N attached to it
* (actually in its upper 5 bits), which represents the weight
* 2^N. The stable name entry keeps a 32-bit reference count, which
* 2^(N-1). The stable name entry keeps a 32-bit reference count, which
* represents any weight between 1 and 2^32 (represented as zero).
* When the weight is 2^32, the stable name table owns "all" of the
* stable pointers to this object, and the entry can be garbage
......@@ -225,7 +225,7 @@ StgStablePtr
getStablePtr(StgPtr p)
{
StgWord sn = lookupStableName(p);
StgWord weight, weight_2;
StgWord weight, n;
weight = stable_ptr_table[sn].weight;
if (weight == 0) {
weight = (StgWord)1 << (BITS_IN(StgWord)-1);
......@@ -238,11 +238,11 @@ getStablePtr(StgPtr p)
else {
weight /= 2;
/* find log2(weight) */
for (weight_2 = 1; weight != 1; weight_2++) {
for (n = 0; weight != 1; n++) {
weight >>= 1;
}
stable_ptr_table[sn].weight -= 1 << (weight_2 - 1);
return (StgStablePtr)(sn + (weight_2 << STABLEPTR_WEIGHT_SHIFT));
stable_ptr_table[sn].weight -= 1 << n;
return (StgStablePtr)(sn + ((n+1) << STABLEPTR_WEIGHT_SHIFT));
}
}
......@@ -322,7 +322,7 @@ markStablePtrTable(rtsBool full)
}
(StgClosure *)p->addr = new;
}
IF_DEBUG(stable, fprintf(stderr,"Stable ptr %d still alive at %p, weight %d\n", p - stable_ptr_table, new, p->weight));
IF_DEBUG(stable, fprintf(stderr,"Stable ptr %d still alive at %p, weight %u\n", p - stable_ptr_table, new, p->weight));
}
}
}
......
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