[llvm-commits] .cfi_* directives

Chris Lattner clattner at apple.com
Thu Oct 28 10:04:35 PDT 2010

On Oct 28, 2010, at 9:50 AM, Rafael EspĂ­ndola wrote:

> I was doing a quick check on what would be needed to make llvm-mc
> handle the assembly outputted by gcc. One big item that showed up was
> the the .cfi_* directives.
> These directives are used to shift part of the responsibility of
> producing the .eh_frame section from the compiler to the assembler.
> They do produce much smaller assembly files, but that is probably not
> an issue for us. If implementing them, each directive would become a
> method in the streamer interface. This might make it a bit easier for
> other users to produce frame information.
> For now I will just push the testing using -fno-dwarf2-cfi-asm, but do
> you think it would be a good idea to eventually implement the .cfi_*
> directives or is this better done in the compiler anyway?

I think that this would be great to add to the MC assembler.  Kevin recently implemented the dwarf .file/.loc directives (for example), which are similar in spirit.  I'm all for making the .s files generated by the compiler more readable.


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