[Lldb-commits] [lldb] [lldb/Plugins] Introduce Scripted Platform Plugin (PR #99814)

[Pavel Labath via lldb-commits]

labath wrote:

> I'd also love to hear other people opinion on extending platforms through ScriptedPlatform (cc @labath @jimingham @JDevlieghere )

I think that having the ability to forward operations to existing platform instances would be very useful. If you look at PlatformQemuUser, most of its functions just forward operations to be host platform. We also have another downstream plugin which looks very similar to that. I would love if both of these could be lightweight python wrappers.

That said, I'm not exactly sure how Greg's idea would work, or if it's even needed. Some of this functionality without any special support, by just having an `SBPlatform` member inside the python class. This would be more flexible as you could call it only when it suits you (going with the Qemu example, the emulator mostly exposes the host filesystem, but it has some special remapping logic for system libraries (like LD_LIBRARY_PATH, but implemented in the emulator), so we may want to implement get/putfile mostly by deferring to the host, and only doing something custom for special paths). And if you really wanted to you could make a python wrapper class that makes all of this looks like (python) inheritance -- without any special support in lldb.

The main flaw in this idea is that the SBPlatform interface is pretty small compared to the internal Platform interface. I'm guessing the python class will be implementing something like the internal interface, while it will only have the external API to work with...

https://github.com/llvm/llvm-project/pull/99814