[PATCH] D83468: [Debuginfo] Fix for PR46653

Wed Aug 19 09:43:20 PDT 2020

Jac1494 added a comment.

> I would consider this to be more of a bug in GDB. Line 0 has a well-defined meaning in DWARF and stands for "no source location corresponds to this code". LLDB, for example, interprets line 0 as an indicator to skip over instructions and automatically steps over them when single-stepping through a program, since line 0 is not a meaningful place to stop. It might be worth talking to the GDB developers and ask them what they think about adding a similar feature to their handling of line 0. DWARF doesn't prescribe that that's how debuggers should behave, but I think it's a reasonable interpretation.

@aprantl I understand line zero meaning in DWARF standard. 
But could you please explain that why this behavior is there with only with Global-isel enabled and NOT with SelectionDAG/FastIsel...? 
I mean when selection/fast-isel is enabled this not seen when using GDB. That suggest bug in global-isel not in GDB...?

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D83468/new/

https://reviews.llvm.org/D83468