From: Richard Ward <richard.j.ward1@googlemail.com>
To: Tom Tromey <tromey@redhat.com>
Cc: archer@sourceware.org
Subject: Re: Patch to add rtti_type member to gdb.Value
Date: Fri, 25 Sep 2009 19:19:00 -0000 [thread overview]
Message-ID: <4ABD179F.6050006@googlemail.com> (raw)
In-Reply-To: <m3fxaayhh8.fsf@fleche.redhat.com>
Tom Tromey wrote:
>>>>>> "Richard" == Richard Ward <richard.j.ward1@googlemail.com> writes:
>
> Richard> This patch adds value gdb.Value.rtti_type to go along side
> Richard> gdb.Value.type. the type represents the type of the value determined
> Richard> by rtti. Luckily it turns out that the info is already available in
> Richard> gdb's value struct, where it has already been properly determined, so
> Richard> there is no need to call any real gdb code. This just exposes
> Richard> it.
>
> Is that always the case? I ask because other code, like the code
> implementing "set print object on", uses value_rtti_type and/or
> value_rtti_target_type.
>
> The patch also has some non-GNU-formatted code; no big deal, just a
> bunch of nits to clean up.
>
> Richard> It is very similar to valpy_get_type (without what appears to
> Richard> be an unnecessary Py_INCREF).
>
> The code:
>
> value_object *obj = (value_object *) self;
> if (!obj->type)
> {
> obj->type = type_to_type_object (value_type (obj->value));
> if (!obj->type)
> {
> obj->type = Py_None;
> Py_INCREF (obj->type);
> }
> }
> Py_INCREF (obj->type);
> return obj->type;
>
> The first Py_INCREF is there because obj->type must be a new reference
> to an object. That lets us pair with the decre at object destruction.
> It looks weird, being on Py_None, but I think that is still correct.
>
> The second Py_INCREF is so that we always return a new reference to our
> caller.
>
> So, I think they are both needed. But if not, I definitely want to know
> about it, and why :-)
>
> Tom
I'll look at the other points later when I have time, but In this case
if Py_None is used it will be incremented twice before being handed back
to the caller.
Richard.
next prev parent reply other threads:[~2009-09-25 19:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-23 18:37 Richard Ward
2009-09-25 19:03 ` Tom Tromey
2009-09-25 19:19 ` Richard Ward [this message]
2009-09-25 20:43 ` Tom Tromey
2009-09-28 9:55 Richard Ward
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