[swift-dev] Emitting redundant protocol conformances to support type lookup

[Joe Groff]

> On Jan 12, 2016, at 11:37 PM, Luke Howard via swift-dev <swift-dev at swift.org> wrote:
> 
> Also, what’s the best way of doing alignment when emitting C structs from IRGen?
> 
> For now I added this to ConstantBuilderBase: 
> 
>     void alignToWordBoundary() {
>       NextOffset.roundUpToAlignment(IGM.getPointerAlignment());
>     }

Why do you need to do this?

-Joe

> — Luke
> 
>> On 13 Jan 2016, at 6:18 PM, Luke Howard <lukeh at padl.com <mailto:lukeh at padl.com>> wrote:
>> 
>> NB – presently the Protocols list is at the very end of GenericParameterDescriptor but it’s cleaner (if ABI disruptive) to put nest it inside Parameter.
>> 
>>> On 13 Jan 2016, at 2:46 PM, Luke Howard via swift-dev <swift-dev at swift.org <mailto:swift-dev at swift.org>> wrote:
>>> 
>>> Would it be possible to extend GenericParameterDescriptor to include a tail-emplaced set of references to ProtocolDescriptors for any parameter type constraints that require witness tables? This would be useful plumbing for a future API that can dynamically instantiate generic types.
>>> 
>>> See:
>>> 
>>> https://github.com/lhoward/swift/blob/SR-381/include/swift/Runtime/Metadata.h#L1199 <https://github.com/lhoward/swift/blob/SR-381/include/swift/Runtime/Metadata.h#L1199>
>>> 
>>> https://github.com/lhoward/swift/blob/SR-381/stdlib/public/runtime/MetadataLookup.cpp#L338 <https://github.com/lhoward/swift/blob/SR-381/stdlib/public/runtime/MetadataLookup.cpp#L338>
>>> 
>>> — Luke
>>> 
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>> 
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