[6.2] ASTDemangler: Round-trip @isolated @sil_implicit_leading_param parameter attributes #82543
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…ter attributes We sometimes mangle SILFunctionTypes when generating debug info for reabstraction thunks, and these can have various exotic parameter and result attributes. Two recent additions were never plumbed through the mangler, causing assertion failures when emitting debug info. Fixes rdar://153730847.
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@swift-ci Please test |
slavapestov
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DougGregor
approved these changes
Jun 26, 2025
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6.2 cherry-pick of #82533
Description: Extend SILFunctionType mangling to preserve certain attributes that were added for the NonisolatedNonsendingByDefault feature. We don't mangle SILFunctionTypes in ABI symbols, but it does appear in debug info for rreabstraction thunks.
Origination: This is part of the SE-0461 feature, new in 6.2.
Scope of the issue: Fixes round-trip debug info assert crash.
Radar: Fixes rdar://153730847.
Risk: While there's a bunch of code here, its all just boilerplate for plumbing these two extra attributes through the SILFunctionType mangling.
Reviewed by: @bnbarham