From ground 0 to Supernova

https://developer.apple.com/videos/play/wwdc2018/416/

Xcode memory debugger view -> File > Export memgraph <a.memgraph>

vmmap <a.memgraph> -verbose | grep IOSurface # -verbose shows each VM page's address (while `-summary` bundles contiguous addresses)
# Pick the latest VM page <address>
leaks -traceTree 0x<address> <a.memgraph>
leaks -traceTree 0x0000000133d0c000 a.memgraph