python2.7 throws bus error when issuing `help("modules")'
noloader at gmail.com
Mon Aug 24 15:36:30 UTC 2020
On Mon, Aug 24, 2020 at 5:59 AM Ryan Schmidt <ryandesign at macports.org> wrote:
> > Logical CPU: 2
> > Error Code: 0x00000007 (invalid protections for user data read)
> > Trap Number: 14
> > ==========cut=================
> > do you see the problem? I don't :|
I see the fix came from
https://github.com/ronaldoussoren/pyobjc/pull/301/files. I don't think
that fix is correct. I think the use is going to give you more trouble
You can't cast a const object to non-const and write to it. The
non-const cast is undefined behavior because the object is const. (You
can only cast a non-const object back to non-const).
I think a more correct (?) fix would be to track the const-ness of the
actual object. That is:
static BOOL is_default_descr(struct _PyObjC_ArgDescr* descr)
needs a way to look at _PyObjC_ArgDescr descr, and determine if it is
a non-const object. I think there are (at least) two ways to do it.
First, add a new field to _PyObjC_ArgDescr. Second, and a new
parameter to is_default_descr. I don't know which is best.
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