Some garbage collectors can move objects to remove fragmentation and update the pointers to them. eg: https://hacks.mozilla.org/2015/07/compacting-garbage-colle

Some garbage collectors can move objects to remove fragmentation and update the pointers to them. eg: https://hacks.mozilla.org/2015/07/compacting-garbage-collection-in-spidermonkey/ https://hacks.mozilla.org/2015/07/compacting-garbage-collect...