[swift-dev] Starter project: Remove old mirrors

[Jean-Pierre Simard]

Thanks for sharing that, Slava! Reading that really helped me gain a better
understanding of how the current reflection model works and how it could be
extended.

Although my intended use cases are more for in-process type-level
reflection akin to objc_copyClassList and class_copyPropertyList.

In any case, swift-dev isn't the best place to discuss this, so I'll
synthesize my thoughts into a swift-evolution proposal shortly.

On Mon, Dec 7, 2015 at 11:51 PM, Slava Pestov <spestov at apple.com> wrote:

> Hi Jean-Pierre,
>
>
> On Dec 7, 2015, at 12:21 PM, Jean-Pierre Simard via swift-dev <
> swift-dev at swift.org> wrote:
>
> > Note that I'm already working on this part. The Swift runtime needs to
> provide low-level reflection interfaces that allow the standard library to
> implement Mirror without depending on private runtime ABI.
>
> That's great to hear! Is there any chance that this work could introduce
> type-level reflection APIs that would allow reflecting uninstantiated
> types? Or should I make a formal proposal for this functionality in
> swift-evolution?
>
>
> There is a proposal for uninstantiated type metadata reflection in the
> GitHub repo in docs/proposals/RemoteMirrors.rst, but it might not cover
> your specific use-case. As Joe hinted, starting from concrete requirements
> is the best way forward here.
>
> Slava
>
>
> On Mon, Dec 7, 2015 at 9:01 AM, Joe Groff via swift-dev <
> swift-dev at swift.org> wrote:
>
>>
>> > On Dec 6, 2015, at 2:20 AM, Dmitri Gribenko via swift-dev <
>> swift-dev at swift.org> wrote:
>> >
>> > We need new runtime entry points that make sense for the new mirror
>> > implementation.  The current entry points (the _reflect() function and
>> > all its implementation details) directly depend on the old mirrors.
>> > This step is slightly harder, but not doesn't require extraordinary
>> > skills.  This part requires writing a proposal, because the runtime
>> > API is going to be stable.
>>
>>
>> Note that I'm already working on this part. The Swift runtime needs to
>> provide low-level reflection interfaces that allow the standard library to
>> implement Mirror without depending on private runtime ABI.
>>
>> -Joe
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>
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