MemRegion MemRegion::intersection(const MemRegion mr2) const {
MemRegion res;
HeapWord* res_start = MAX2(start(), mr2.start());
HeapWord* res_end = MIN2(end(), mr2.end());
if (res_start < res_end) {
res.set_start(res_start);
res.set_end(res_end);
}
return res;
}
MemRegion MemRegion::_union(const MemRegion mr2) const {
// If one region is empty, return the other
if (is_empty()) return mr2;
if (mr2.is_empty()) return MemRegion(start(), end());
// Otherwise, regions must overlap or be adjacent
assert(((start() <= mr2.start()) && (end() >= mr2.start())) ||
((mr2.start() <= start()) && (mr2.end() >= start())),
"non-adjacent or overlapping regions");
MemRegion res;
HeapWord* res_start = MIN2(start(), mr2.start());
HeapWord* res_end = MAX2(end(), mr2.end());
res.set_start(res_start);
res.set_end(res_end);
return res;
}