[cxx-interop] Layout reference types that use tail padding of their bases correctly #80344
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…ases correctly This is a follow-up to d3e43bb which resolved the issue for value types, but not for foreign reference types. This change teaches IRGen that a base type of a C++ type might occupy less memory than its `sizeof`, specifically, it might only use `dsize` amount of memory. rdar://147527755
egorzhdan
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Xazax-hun,
fahadnayyar,
hnrklssn,
j-hui,
rjmccall,
susmonteiro and
zoecarver
as code owners
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@swift-ci please test |
Xazax-hun
approved these changes
Mar 28, 2025
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This is a follow-up to d3e43bb which resolved the issue for value types, but not for foreign reference types.
This change teaches IRGen that a base type of a C++ type might occupy less memory than its
sizeof, specifically, it might only usedsizeamount of memory.rdar://147527755