void G1MarkSweep::mark_sweep_phase2() {
// Now all live objects are marked, compute the new object addresses.
// It is imperative that we traverse perm_gen LAST. If dead space is
// allowed a range of dead object may get overwritten by a dead int
// array. If perm_gen is not traversed last a klassOop may get
// overwritten. This is fine since it is dead, but if the class has dead
// instances we have to skip them, and in order to find their size we
// need the klassOop!
//
// It is not required that we traverse spaces in the same order in
// phase2, phase3 and phase4, but the ValidateMarkSweep live oops
// tracking expects us to do so. See comment under phase4.
G1CollectedHeap* g1h = G1CollectedHeap::heap();
Generation* pg = g1h->perm_gen();
EventMark m("2 compute new addresses");
TraceTime tm("phase 2", PrintGC && Verbose, true, gclog_or_tty);
GenMarkSweep::trace("2");
FindFirstRegionClosure cl;
g1h->heap_region_iterate(&cl);
HeapRegion *r = cl.result();
CompactibleSpace* sp = r;
if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) {
sp = r->next_compaction_space();
}
G1PrepareCompactClosure blk(sp);
g1h->heap_region_iterate(&blk);
CompactPoint perm_cp(pg, NULL, NULL);
pg->prepare_for_compaction(&perm_cp);
}
