[4.2] Runtime: Handle synthesized decl "related entity" tags. #17603
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Better to log the failure than fall off the edge of this function, which is expected to always invoke its callback once.
Clang-importer-synthesized declarations get an extra tag character included in their mangling, which was not being preserved in type context descriptors. This caused runtime lookup for these synthesized types to fail. Fix this by adding the tag information to type context descriptors and teaching the runtime to match it up when fetching metadata by mangled name. Fixes rdar://problem/40878715.
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@swift-ci Please test |
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@swift-ci Please nominate |
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Explanation: Memory corruption would occur when attempting to reflect a Swift type that was synthesized by the Clang importer, such as NSError wrapper types.
Scope: Regression from Swift 4.1
Issue: rdar://problem/40878715
Risk: Low, additive change to the runtime to cover mangling cases that were dropped on the floor before.
Testing: Test case from Radar, Swift CI
Reviewed by: @DougGregor and @jrose-apple