Re: Libffi problem on darwin (MacOSX)

[Andreas Tobler <toa@pop.agri.ch>]

Dale Johannesen wrote:
> On Friday, May 16, 2003, at 01:55  PM, Ronald Oussoren wrote:
> 
>> We're using libffi closures in the Objective-C method tables to 
>> forward calls from Objective-C to python. This is working fine for 
>> basic calls, but gives wrong results when structs are passed. It looks 
>> like a mismatch between the compiler and libffi: 
>> ffi_closure_helper_DARWIN in libffi_darwin.c seems to assume that 
>> structs are passed "by reference" (line 615), while the compiler 
>> passes small structs entirely in registers (see assembly code emited 
>> by the following C snippet):
> 
> 
> I'm not familiar with libffi, but I can confirm that the compiler is 
> doing the
> right thing, and it's the same thing it's always done.  It looks like 
> ffi_prep_args
> and ffi_prep_cif_machdep correctly understand that structs are passed by 
> value, so
> this is just a bug in ffi_closure_helper_DARWIN.

Hey great, people are using libffi on darwin-ppc. I guess this is born 
on my camp. I'll have a look at, as soon as  time allows here.
It is possible that I didn't finish the libffi regarding structures 
since I didn't need it for libjava work. So, you could be right.

Thank you for the report.

Andreas