Thank you for the replies. A follow-up question, how does any GC/runtime/VM know which parts of the memory are actual data vis-a-vis pointers to other parts of

Thank you for the replies. A follow-up question, how does any GC/runtime/VM know which parts of the memory are actual data vis-a-vis pointers to other parts of the memory? Some sort of global pointer table, perhaps? If so, why cant the hypothetical GC lib define an API to share said pointer-table?