<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=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jan 12, 2016, at 11:37 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=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Also, what’s the best way of doing alignment when emitting C structs from IRGen?</span><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">For now I added this to ConstantBuilderBase: <div class=""><br class=""></div><div class=""><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"> <span class="" style="color: rgb(187, 44, 162);">void</span><span class="Apple-converted-space"> </span>alignToWordBoundary() {</div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"> NextOffset.roundUpToAlignment(IGM.getPointerAlignment());</div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"> }</div></div></div></div></blockquote><div><br class=""></div><div>Why do you need to do this?</div><div><br class=""></div><div>-Joe</div><br class=""><blockquote type="cite" class=""><div class=""><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div class=""><div class="">— Luke</div><div class=""><br class=""><div class=""><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=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">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=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><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><img src="https://u2002410.ct.sendgrid.net/wf/open?upn=SR07gluzTtbLn1NkwrRTLoDDrzbnfHXcYUYgibjZHaGyTyRyu8Twclprh0i2vP6W9bOfHTpgZy7aFXnWXlswCXCgbfUcN-2FTXOw4wxTcfQyJnGUXZAxt-2BViJVdcqFYH3ZDMtxuI14dEX9LqfTySNfn455Os1OGOkh-2BCqAHPynzP-2B4Ju8v-2BW4NrxdQrIPf6QyAEhvGPmSYZgpt-2BDagcdESRA-3D-3D" alt="" width="1" height="1" border="0" class="" style="height: 1px !important; 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