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b9341c8713
During protocol witness SILGen for `@differentiable` class methods, replace the `AutoDiffDerivativeFunctionIdentifier` generic signature with the witness thunk substitution map's generic signature. Resolves TF-1180: vtable SIL verification error.
38 lines
2.3 KiB
Swift
38 lines
2.3 KiB
Swift
// RUN: %target-swift-frontend -emit-silgen %s
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// TF-1180: SIL verification error regarding `@differentiable` class method
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// witnesses for `@differentiable` protocol requirements.
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import _Differentiation
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protocol Protocol {
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@differentiable
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func method(_ x: Float) -> Float
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}
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class Class: Protocol {
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@differentiable
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public func method(_ x: Float) -> Float { x }
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}
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// Original error:
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// SIL verification failed: method does not appear in the class's vtable: VerifyClassMethodVisitor(member).Seen
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// Verifying instruction:
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// %2 = load_borrow %1 : $*Class // users: %8, %4, %3
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// -> %3 = class_method %2 : $Class, #Class.method!jvp.SU.<Self where Self : Protocol> : (Class) -> (Float) -> Float, $@convention(method) (Float, @guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) // user: %4
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// %4 = apply %3(%0, %2) : $@convention(method) (Float, @guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) // user: %5
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// In function:
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// // AD__$s4main5ClassCAA8ProtocolA2aDP6methodyS2fFTW_jvp_SU
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// sil private [transparent] [thunk] [ossa] @AD__$s4main5ClassCAA8ProtocolA2aDP6methodyS2fFTW_jvp_SU : $@convention(witness_method: Protocol) (Float, @in_guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) {
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// // %0 // user: %4
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// // %1 // user: %2
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// bb0(%0 : $Float, %1 : $*Class):
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// %2 = load_borrow %1 : $*Class // users: %8, %4, %3
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// %3 = class_method %2 : $Class, #Class.method!jvp.SU.<Self where Self : Protocol> : (Class) -> (Float) -> Float, $@convention(method) (Float, @guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) // user: %4
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// %4 = apply %3(%0, %2) : $@convention(method) (Float, @guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) // user: %5
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// (%5, %6) = destructure_tuple %4 : $(Float, @callee_guaranteed (Float) -> Float) // users: %7, %7
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// %7 = tuple (%5 : $Float, %6 : $@callee_guaranteed (Float) -> Float) // user: %9
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// end_borrow %2 : $Class // id: %8
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// return %7 : $(Float, @callee_guaranteed (Float) -> Float) // id: %9
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// } // end sil function 'AD__$s4main5ClassCAA8ProtocolA2aDP6methodyS2fFTW_jvp_SU'
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