[cfe-dev] Block introspection and GNU runtime new ABI support

[Daniel Dunbar]

Ping?

It seems like non consensus was reached, but the code went in. Should
we pull it for now?

 - Daniel

On Fri, Sep 11, 2009 at 6:25 AM, David Chisnall <csdavec at swansea.ac.uk> wrote:
> On 10 Sep 2009, at 22:43, Blaine Garst wrote:
>
>> Changing the ABI is very painful - we were unable to move the invoke
>> function into the descriptor structure as we had originally intended
>> for example, so I also advise caution.
>
> In the interests of future compatibility, may we use one of the bits
> in the flags field to indicate the presence of this type encoding
> (e.g. (2<<30))?  Then we can easily switch block runtimes in existing
> code and just keep the accessor function for the type encoding (or
> compute it on-the-fly if that flag is not present but the information
> is there in some other way).
>
> Longer term, we'd probably like to deprecate our blocks runtime and
> use the one from compiler-rt, but looking at that code it seems that
> it will take a bit of effort to make it compile on platforms other
> than Windows and Darwin, and to integrate with the GNU Objective-C
> runtime.
>
> David
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