1277   Stack<oop,mtGC> oop_stack;

  1277   Stack<oop,mtGC> oop_stack;

  1278 

  1278 

  1279   // First, we process all GC roots. This populates the work stack with initial objects.

  1279   // First, we process all GC roots. This populates the work stack with initial objects.

  1280   ShenandoahAllRootScanner rp(1, ShenandoahPhaseTimings::_num_phases);

  1280   ShenandoahAllRootScanner rp(1, ShenandoahPhaseTimings::_num_phases);

  1281   ObjectIterateScanRootClosure oops(&_aux_bit_map, &oop_stack);

  1281   ObjectIterateScanRootClosure oops(&_aux_bit_map, &oop_stack);

  1283 

  1288 

  1284   // Work through the oop stack to traverse heap.

  1289   // Work through the oop stack to traverse heap.

  1285   while (! oop_stack.is_empty()) {

  1290   while (! oop_stack.is_empty()) {

  1286     oop obj = oop_stack.pop();

  1291     oop obj = oop_stack.pop();

  1287     assert(oopDesc::is_oop(obj), "must be a valid oop");

  1292     assert(oopDesc::is_oop(obj), "must be a valid oop");