Serialization: Lazily deserialize OpaqueTypeDecl's underlying substitutions #85593
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slavapestov
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hborla,
ian-twilightcoder,
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xymus
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slavapestov
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Xazax-hun,
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ian-twilightcoder,
j-hui,
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xedin
slavapestov
commented
Nov 19, 2025
| GenericParamList *genericParams; | ||
| SET_OR_RETURN_ERROR(genericParams, MF.maybeReadGenericParams(declContext)); | ||
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| // FIXME: Do we still need exportUnderlyingType? |
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@xymus This looks like it was put in as a temporary workaround for the very same issue, is there any reason to keep it now?
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…utions We need to serialize the underlying type substitution map for an inlinable function. However, there is no reason to deserialize it eagerly, since doing so can lead to cycles. It is better for correctness and performance to only deserialize it when needed. Technically this fixes a regression from swiftlang#84299, but the actual problem was there all along, it was just exposed by my change on a specific project. Fixes rdar://163301203.
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@swift-ci Please smoke test |
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@swift-ci Please test Windows |
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We need to serialize the underlying type substitution map for an inlinable function. However, there is no reason to deserialize it eagerly, since doing so can lead to cycles. It is better for correctness and performance to only deserialize it when needed.
Technically this fixes a regression from #84299, but the actual problem was there all along, it was just exposed by my change on a specific project.
Fixes rdar://163301203.