<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Also, what’s the best way of doing alignment when emitting C structs from IRGen?<div class=""><br class=""></div><div class="">For now I added this to ConstantBuilderBase: <div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> <span style="font-variant-ligatures: no-common-ligatures; color: #bb2ca2" class="">void</span> alignToWordBoundary() {</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> NextOffset.roundUpToAlignment(IGM.getPointerAlignment());</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""> }</div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;" class=""><br class=""></div><div class="">— Luke</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 13 Jan 2016, at 6:18 PM, Luke Howard <<a href="mailto:lukeh@padl.com" class="">lukeh@padl.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">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.<div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On 13 Jan 2016, at 2:46 PM, Luke Howard via swift-dev <<a href="mailto:swift-dev@swift.org" class="">swift-dev@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">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.</div><div class=""><br class=""></div><div class="">See:</div><div class=""><br class=""></div><div class=""><a href="https://github.com/lhoward/swift/blob/SR-381/include/swift/Runtime/Metadata.h#L1199" class="">https://github.com/lhoward/swift/blob/SR-381/include/swift/Runtime/Metadata.h#L1199</a></div><div class=""><br class=""></div><div class=""><a href="https://github.com/lhoward/swift/blob/SR-381/stdlib/public/runtime/MetadataLookup.cpp#L338" class="">https://github.com/lhoward/swift/blob/SR-381/stdlib/public/runtime/MetadataLookup.cpp#L338</a></div><div class=""><br class=""></div><div class="">— Luke</div>
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