[clang] [llvm] [clang][DebugInfo] Add symbol for debugger with VTable information. (PR #130255)

[David Blaikie via llvm-commits]

dwblaikie wrote:

> > Removing the vtable global variable and moving the "location info" into the static within the class, will work for the SCE debugger.
> 
> I was thinking about this last night and wondering if the vtable will appear as a class member even if the class is local to a function?
> 
> If so then it seems like this would be hard for gdb to find (can't speak for other debuggers). The issue being that gdb tends not to read DIEs that it thinks are uninteresting, and this means function bodies in general are skipped.
> 
> If the vtable were a global-but-artificial object, then it would readily be found by the initial scan.

Hmm, so I think the idea was that there'd still be an out-of-line definition (like for an inline static class member variable with storage - the DWARF contains a definition DIE that's outside the class, eg: https://godbolt.org/z/z3Kz8Eorn ) - though since static class members can't exist in function-local classes we can't quite extrapolate from there. I'd say we can extrapolate from function-local types member function definitions, which appear outside the function the type is local to: https://godbolt.org/z/zvf15YKhE

https://github.com/llvm/llvm-project/pull/130255