Safe Pointers at the Intermediate Language or Hardware Level

Hi,


        Its been a long time since Java & .Net introduced safe address
        types to the computing world.


        My question is have we settled on what could be a proper representation
        for safe pointers ?


        Some Mainframes like the 390 have historically supported safe pointers,
        I remember.


Sincerely,
Seima Rao.
[I looked at my S/390 Principles of Operation, and I see a bunch of stuff
for tracing, but nothing that looks like safe pointers. I'd think it was
hardware dependent, e.g., if a machine has a fairly clean and efficient
trap for an unmapped zero address, you'd use that, but if it doesn't, you'd
do something else. -John]

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