[pjmlp]

In the specific case of the OpenJDK, there isn't the one JVM, rather a standard[0], like in ISO languages, with a reference implementation to go along it,

https://en.wikipedia.org/wiki/List_of_Java_virtual_machines

And the list doesn't include all, e.g. PTC (https://www.ptc.com/en/products/developer-tools/perc)

[0] - https://docs.oracle.com/javase/specs/index.html

[1718627440]

malloc is also not a specific implementation, but a standardized interface for allocating on the heap.