[llvm] [Dwarf][Transforms] Add dwarf support when func signature changed (PR #127855)

[via llvm-commits]

yonghong-song wrote:

> How about an extension to the standard attribute? It's a pity the DW_CC_* doesn't have a user defined extension space, but could get a bit weird and use some high-ish value to avoid colliding with likely standard features added to the enum.
> 
> Perhaps you could file a DWARF issue to discuss the long-term/standardized solution to this?

I could do this. But one thing I want to emphasize is for tag LLVM_func_args_changed. Currently we have not figured out what sub-tags or attributes for LLVM_func_args_changed. It won't be easy to express changed arguments, relation to original arguments, etc. But using a tag allows future extension.



https://github.com/llvm/llvm-project/pull/127855