[SR-953] Implement Bundle(for: class): Expose SPI to get type descriptor. #16964
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@swift-ci please test |
slavapestov
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Jun 4, 2018
include/swift/Runtime/Metadata.h
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| #if !SWIFT_OBJC_INTEROP | ||
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| SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_SPI // SPI for swift-corelibs-foundation | ||
| ConstTargetMetadataPointer<swift::InProcess, TargetTypeContextDescriptor> |
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Maybe this should just return a void *, since (at least for now) the callers treat it as an opaque pointer?
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I would have it use const TypeContextDescriptor * instead of the Target template, since this will only ever be used in-process. I don't think there's any harm in having it return the real type here. I also don't think the leading underscore is necessary; IMO this makes sense as a general runtime entry point.
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I'll make those changes.
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@swift-ci please test and merge |
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Per discussion with @jckarter — we would like to have a way, given a class, to get a symbol that originates in the same image (library/shared object/executable etc.) so we can implement
Bundle(for class: AnyClass)in terms ofdladdr(). The type descriptor apparently satisfies this condition for all classes that were compiled AOT.This exposes a C SPI for swift-corelibs-foundation use to obtain the type descriptor given a type.
Resolves SR-953 alongside the patch at swiftlang/swift-corelibs-foundation#1573.