osfmk/kern/zalloc.c

471  * the records to be ordered chronologically, and a small array to hold the pc's from the stack trace.  A
481         void		*z_pc[MAX_ZTRACE_DEPTH];	/* stack trace of caller */
592 /* Times a new alloc or trace is put into the hash table */
680 		printf("Zone leak trace buckets override:%u\n", zleak_trace_buckets);
808  * (or just increments the refcount if the trace is already recorded)
810  * the associated trace's refcount is decremented.
811  * If the trace slot is in use, it returns.
830 	struct ztrace* trace = &ztraces[trace_index];
833 	trace->zt_hit_count++;
837 	 * has the same trace as us, just bail.
847 	/* A size of zero indicates that the trace bucket is free. */
849 	if (trace->zt_size > 0 && bcmp(trace->zt_stack, bt, (depth * sizeof(uintptr_t))) != 0 ) {
851 		 * Different unique trace with same hash!
852 		 * Just bail - if we're trying to record the leaker, hopefully the other trace will be deallocated
855 		trace->zt_collisions++;
860 	} else if (trace->zt_size > 0) {
861 		/* Same trace, already added, so increment refcount */
862 		trace->zt_size += allocation_size;
864 		/* Found an unused trace bucket, record the trace here! */
865 		if (trace->zt_depth != 0) /* if this slot was previously used but not currently in use */
869 		trace->zt_size			= allocation_size;
870 		memcpy(trace->zt_stack, bt, (depth * sizeof(uintptr_t)) );
872 		trace->zt_depth		= depth;
873 		trace->zt_collisions	= 0;
901 	if (top_ztrace->zt_size < trace->zt_size)
902 		top_ztrace = trace;
930 			struct ztrace *trace;
938 			trace = &ztraces[allocation->za_trace_index];
940 			/* size of 0 indicates trace bucket is unused */
941 			if (trace->zt_size > 0) {
942 				trace->zt_size -= allocation_size;