-
- // mark the next bit to indicate "scavenged"
- mark(q+1, Bdescr(q));
-
- } // while (!mark_stack_empty())
-
- // start a new linear scan if the mark stack overflowed at some point
- if (mark_stack_overflowed && oldgen_scan_bd == NULL) {
- debugTrace(DEBUG_gc, "scavenge_mark_stack: starting linear scan");
- mark_stack_overflowed = rtsFalse;
- oldgen_scan_bd = oldest_gen->steps[0].old_blocks;
- oldgen_scan = oldgen_scan_bd->start;
- }
-
- if (oldgen_scan_bd) {
- // push a new thing on the mark stack
- loop:
- // find a closure that is marked but not scavenged, and start
- // from there.
- while (oldgen_scan < oldgen_scan_bd->free
- && !is_marked(oldgen_scan,oldgen_scan_bd)) {
- oldgen_scan++;
- }
-
- if (oldgen_scan < oldgen_scan_bd->free) {
-
- // already scavenged?
- if (is_marked(oldgen_scan+1,oldgen_scan_bd)) {
- oldgen_scan += sizeofW(StgHeader) + MIN_PAYLOAD_SIZE;
- goto loop;
- }
- push_mark_stack(oldgen_scan);
- // ToDo: bump the linear scan by the actual size of the object
- oldgen_scan += sizeofW(StgHeader) + MIN_PAYLOAD_SIZE;
- goto linear_scan;
- }
-
- oldgen_scan_bd = oldgen_scan_bd->link;
- if (oldgen_scan_bd != NULL) {
- oldgen_scan = oldgen_scan_bd->start;
- goto loop;
- }
- }