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43f1581c4b
Unlike with synchronous functions, an async 'throws' function and an async non-throwing function are not ABI-compatible. This would lead to an ABI mismatch and runtime crash when overriding an `async throws` function with an `async` one. Deal with this ABI incompatibility by producing an appropriate thunk. Fixes SR-15766 / rdar://problem/88035174.
24 lines
1.2 KiB
Swift
24 lines
1.2 KiB
Swift
// RUN: %target-swift-frontend -emit-silgen %s -disable-availability-checking | %FileCheck %s
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// REQUIRES: concurrency
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class BaseClass<T> {
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func wait() async -> T {}
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func waitOrDie() async throws -> T {}
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}
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class Derived : BaseClass<Int> {
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override func wait() async -> Int {}
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override func waitOrDie() async -> Int {}
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}
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// CHECK-LABEL: sil private [thunk] [ossa] @$s18async_vtable_thunk7DerivedC4waitSiyYaFAA9BaseClassCADxyYaFTV : $@convention(method) @async (@guaranteed Derived) -> @out Int {
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// CHECK-LABEL: sil_vtable Derived {
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// CHECK: #BaseClass.wait: <T> (BaseClass<T>) -> () async -> T : @$s18async_vtable_thunk7DerivedC4waitSiyYaFAA9BaseClassCADxyYaFTV [override]
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// CHECK-NEXT: #BaseClass.waitOrDie: <T> (BaseClass<T>) -> () async throws -> T : @$s18async_vtable_thunk7DerivedC9waitOrDieSiyYaFAA9BaseClassCADxyYaKFTV [override]
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// CHECK-NEXT: #BaseClass.init!allocator: <T> (BaseClass<T>.Type) -> () -> BaseClass<T> : @$s18async_vtable_thunk7DerivedCACycfC [override]
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// CHECK-NEXT: #Derived.waitOrDie: (Derived) -> () async -> Int : @$s18async_vtable_thunk7DerivedC9waitOrDieSiyYaF
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// CHECK-NEXT: #Derived.deinit!deallocator: @$s18async_vtable_thunk7DerivedCfD
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// CHECK-NEXT: }
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