[Lldb-commits] [lldb] [lldb] Track CFA pointer metadata in StackID (PR #157498)

[Felipe de Azevedo Piovezan via lldb-commits]

felipepiovezan wrote:

@DavidSpickett @jasonmolenda I finally managed to write a test for this, but it took some assembly / DWARF bit scrubbing. Swift uses a lot of variable descriptions done in terms of CallFrameAddress, but with plain old C it is a bit hard. I hacked around this compiling a simple C program (see main.s) and editing it to:

1. force a variable location to be described in terms of OP_call_frame_addres
2. force fp to have its top nibble changed.

This is described in the test itself.

I also had to add a few changes in `RegisterContextUnwind::ReadFrameAddress` which I had forgotten to include in this  commit previously; it's nothing surprising, just more "don't fix pointers".

Apologies for the  force push here.

https://github.com/llvm/llvm-project/pull/157498