[Lldb-commits] [lldb] [debugserver] Support for `qMemTags` packet (PR #160952)

[David Spickett via lldb-commits]

DavidSpickett wrote:

> My understanding is that all of the tag interpretation and error handling happens on the LLDB client side, so these aspects are already tested by the Linux tests. I essentially only re-implemented the existing qMemTags packet in debugserver and added integration tests for the most important use cases.

Ok but for my own education can you tell me whether the following situation can actually happen on your systems?
```
tagged page
untagged page
tagged page
```
With this layout on Linux I may end up reading across boundaries so parts of my memory read will have tags and parts won't. I wonder if you have a more "per process" rather than "per page" model.

Also I bring this up because I'm not running those Linux tests with any regularity. If/when we have MTE hardware to hand, it'll happen but I'm not pushing for it myself.

If the above scenario cannot happen in your systems, or you have your own integration testing anyway, this is not a problem for you. But of course make your own judgements here.

If you did want to test that stuff, you might be able to port the Linux tests but I wouldn't try too hard to do so. There's going to be enough differences I bet that mean the tests would be clearer staying separate.

https://github.com/llvm/llvm-project/pull/160952