src/share/vm/gc/g1/g1BlockOffsetTable.cpp

rev 12235 : [mq]: block_start_acquire

*** 225,235 ****
    if (addr >= _space->top()) return _space->top();
    while (next_boundary < addr) {
      while (n <= next_boundary) {
        q = n;
        oop obj = oop(q);
!       if (obj->klass_or_null() == NULL) return q;
        n += block_size(q);
      }
      assert(q <= next_boundary && n > next_boundary, "Consequence of loop");
      // [q, n) is the block that crosses the boundary.
      alloc_block_work(&next_boundary, &next_index, q, n);
--- 225,235 ----
    if (addr >= _space->top()) return _space->top();
    while (next_boundary < addr) {
      while (n <= next_boundary) {
        q = n;
        oop obj = oop(q);
!       if (obj->klass_or_null_acquire() == NULL) return q;
        n += block_size(q);
      }
      assert(q <= next_boundary && n > next_boundary, "Consequence of loop");
      // [q, n) is the block that crosses the boundary.
      alloc_block_work(&next_boundary, &next_index, q, n);