Eryk Sun added the comment:
This issue is more straight-forward than #22273. ISTM, we just have to copy
large values. For example, in ffi_call, we'd iterate over the arguments and
alloca and memcpy the large values prior to calling ffi_call_AMD64:
case FFI_SYSV:
/* If a single argument takes more than 8 bytes,
then a copy is passed by reference. */
for (unsigned i = 0; i < cif->nargs; i++) {
size_t z = cif->arg_types[i]->size;
if (z > 8) {
void *temp = alloca(z);
memcpy(temp, avalue[i], z);
avalue[i] = temp;
}
}
/*@-usedef@*/
return ffi_call_AMD64(ffi_prep_args, &ecif, cif->bytes,
cif->flags, ecif.rvalue, fn);
/*@=usedef@*/
break;
----------
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<http://bugs.python.org/issue29565>
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