🍒[cxx-interop] Tweak C++ type semantics detection #67127
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`CxxRecordSemanticsKind::ExplicitlyUnsafe` and `CxxRecordSemanticsKind::UnsafePointerMember` were never directly used, and those do not indicate semantics: they indicate safety of the type when used from Swift, which should be handled by another request `IsSafeUseOfCxxDecl` instead of `CxxRecordSemantics`. Having `ExplicitlyUnsafe` and `UnsafePointerMember` as semantics indicators was problematic, for instance, for types that are move-only and store a pointer at the same time. Swift allowed the usage of these types (under the rules for `UnsafePointerMember` types) when move-only types are disabled, and did not apply the move-only attribute on such types when move-only types are enabled. rdar://110644300 (cherry picked from commit 6e7fb32)
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@swift-ci please test |
DougGregor
approved these changes
Jul 5, 2023
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Explanation: This fixes the handling of types that are move-only and store a pointer at the same time. Swift allowed the usage of these types (under the rules for
UnsafePointerMembertypes) when move-only types are disabled, and did not apply the move-only attribute on such types when move-only types are enabled.Scope: This changes the way ClangImporter detects the semantics of C++ types.
Risk: Low, this only has an effect when C++ interop is enabled.
Original PR: #67115
rdar://110644300
(cherry picked from commit 6e7fb32)