Re: MPS: nativecomp ABI

[Andrea Corallo <acorallo@gnu.org>]

Pip Cet <pipcet@protonmail.com> writes:

> On Saturday, July 6th, 2024 at 17:53, Andrea Corallo <acorallo@gnu.org> wrote:
>> Pip Cet pipcet@protonmail.com writes:
>> > I'm working on scratch/igc. One thing I'd like to do is put the IGC header which all objects will require (for now) into these structs:
>> >
>> > struct Lisp_Cons
>> > struct Lisp_Symbol
>> > struct Lisp_String
>> > struct Lisp_Float
>> > union vectorlike_header
>> >
>> > IIUC, this means changing the nativecomp ABI hash (which means I'll
>> > have to rebuild the .eln files, I think) and adjusting any nativecomp
>> > code which knows about the structure layouts. However, I've only been
>> > able to find that for Lisp_Cons and struct Lisp_Symbol_With_Pos, which
>> > declares its header as ptrdiff_t. Are there more, or do the others all
>> > use C functions for access?
>> >
>> > Things appear to work, but I'd rather not miss anything and haven't looked at this code in years.
>> >
>> > Thanks!
>> > Pip
>
>> I believe the easiest is that you compile a .eln with
>> native-comp-debug >= 2 and have a look to the generated pseudo C.
>>
>
>> Indipendently to the code being compiled, on top you'll see all the
>> structures defined to libgccjit.
>
> Thanks for the advice. That worked for me, though I must confess I was looking in the wrong place for the pseudo-C code.

Right I improved the doc to make it clear where to find it.

  Andrea