mossberg added a comment.

In D71372#1781316 <https://reviews.llvm.org/D71372#1781316>, @labath wrote:

> I'm not sure how easy it is to do that here, but it would certainly be nice 
> to include these error messages in the actual error output from the "finish" 
> command so that they are visible even without logging enabled.


Agreed!

> As for the test, you should be able to do something similar to the tests in 
> the test/Shell/Unwind folder (e.g. eh-frame-dwarf-unwind.test). I.e., you 
> could write an assembly function which uses a non-standard frame layout, but 
> do *not* describe that layout via .eh_frame. Then, stop in that function and 
> try to step out...

Thanks, will look into this.

> Are you sure there is nothing mapped at that address? I'm not a darwin 
> expert, but I have a vague knowledge that the darwin loader (or some other 
> component of the system) actually maps a couple of pages of unreadable memory 
> around the address zero...

Here's how I checked:

  (lldb) fin
   SynthesizeTailCallFrames: can't find previous function
   Return address (0x22) did not point to executable memory.
   Discarding thread plans for thread tid = 0x1bd7b6, up to 0x7fe2f165a220
  error: Could not create return address breakpoint.
  (lldb) image list -a 0x22
  error: Couldn't find module containing address: 0x22.



  $ vmmap 94213 0x22
  0x22 is not in any region.  Bytes before following region: 4294967262




Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D71372/new/

https://reviews.llvm.org/D71372



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