Tony Reix <[email protected]> added the comment:
On AIX 7.2, with libffi compiled with -O0 -g, I have:
1) Call to memchr thru memchr_args_hack
#0 0x09000000001b0d60 in memchr () from /usr/lib/libc.a(shr_64.o)
#1 0x09000000058487a0 in ffi_call_DARWIN () from
/opt/freeware/lib/libffi.a(libffi.so.6)
#2 0x0900000005847eec in ffi_call (cif=0xfffffff, fn=0xffffca90,
rvalue=0xfffffff, avalue=0xffffca80) at ../src/powerpc/ffi_darwin.c:31
#3 0x09000000058f9900 in ?? ()
#4 0x09000000058ebb6c in ?? ()
#5 0x090000000109fc18 in _PyObject_MakeTpCall () from
/opt/freeware/lib64/libpython3.8.so
r3 0xa000000003659e0 720575940382841312
r4 0x64 100
r5 0x7 7
(gdb) x/s $r3
0xa000000003659e0: "abcdef"
2) Call to memchr thru memchr_args_hack2
#0 0x09000000001b0d60 in memchr () from /usr/lib/libc.a(shr_64.o)
#1 0x09000000058487a0 in ffi_call_DARWIN () from
/opt/freeware/lib/libffi.a(libffi.so.6)
#2 0x0900000005847eec in ffi_call (cif=0xfffffff, fn=0xffffca90,
rvalue=0xfffffff, avalue=0xffffca80) at ../src/powerpc/ffi_darwin.c:31
#3 0x09000000058f9900 in ?? ()
#4 0x09000000058ebb6c in ?? ()
#5 0x090000000109fc18 in _PyObject_MakeTpCall () from
/opt/freeware/lib64/libpython3.8.so
r3 0xa000000003659e0 720575940382841312
r4 0x64 100
r5 0x0 0
So, it looks like, when libffi is not compiled with -O but with -O0 -g, that in
64bit ffi_call_DARWIN() is call in both cases (memchr_args_hack and
memchr_args_hack2).
However, as seen previously, it was not the case with libffi built with -O .
Moreover, we have in source code:
switch (cif->abi)
{
case FFI_AIX:
ffi_call_AIX(&ecif, -(long)cif->bytes, cif->flags, ecif.rvalue, fn,
FFI_FN(ffi_prep_args));
break;
case FFI_DARWIN:
ffi_call_DARWIN(&ecif, -(long)cif->bytes, cif->flags, ecif.rvalue, fn,
FFI_FN(ffi_prep_args), cif->rtype);
Why calling ffi_call_DARWIN instead of ffi_call_AIX ?
Hummm Will rebuild libffi and python both with gcc -O0 -g -gdwarf and look at
details.
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<https://bugs.python.org/issue38628>
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