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Compiler: - Add `Forward` and `Reverse` to `DifferentiabilityKind`. - Expand `DifferentiabilityMask` in `ExtInfo` to 3 bits so that it now holds all 4 cases of `DifferentiabilityKind`. - Parse `@differentiable(reverse)` and `@differentiable(_forward)` declaration attributes and type attributes. - Emit a warning for `@differentiable` without `reverse`. - Emit an error for `@differentiable(_forward)`. - Rename `@differentiable(linear)` to `@differentiable(_linear)`. - Make `@differentiable(reverse)` type lowering go through today's `@differentiable` code path. We will specialize it to reverse-mode in a follow-up patch. ABI: - Add `Forward` and `Reverse` to `FunctionMetadataDifferentiabilityKind`. - Extend `TargetFunctionTypeFlags` by 1 bit to store the highest bit of differentiability kind (linear). Note that there is a 2-bit gap in `DifferentiabilityMask` which is reserved for `AsyncMask` and `ConcurrentMask`; `AsyncMask` is ABI-stable so we cannot change that. _Differentiation module: - Replace all occurrences of `@differentiable` with `@differentiable(reverse)`. - Delete `_transpose(of:)`. Resolves rdar://69980056.
51 lines
2.3 KiB
Swift
51 lines
2.3 KiB
Swift
// Test missing protocol requirement `@differentiable` attribute errors for
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// non-public protocol witnesses, when the protocol conformance is declared in a
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// separate file from witnesses.
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//
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// Implicit `@differentiable` attributes cannot be generated for protocol
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// witnesses when the conformance is declared from a separate file from the
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// witness. Otherwise, compilation of the file containing the conformance
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// creates references to external symbols for implicit `@differentiable`
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// attributes, even though no such symbols exist.
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//
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// Context: https://github.com/apple/swift/pull/29771#issuecomment-585059721
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// Note: `swiftc main.swift other_file.swift` runs three commands:
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// - `swiftc -frontend -primary-file main.swift other_file.swift -o ...`
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// - `swiftc -frontend main.swift -primary-file other_file.swift -o ...`
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// - `/usr/bin/ld ...`
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//
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// `%target-build-swift` performs `swiftc main.swift other_file.swift`, so it is expected to fail (hence `not`).
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// `swiftc -frontend -primary-file main.swift other_file.swift` should fail, so `-verify` is needed.
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// `swiftc -frontend main.swift -primary-file other_file.swift` should succeed, so no need for `-verify`.
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// RUN: %target-swift-frontend -c -verify -primary-file %s %S/Inputs/other_file.swift
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// RUN: %target-swift-frontend -c %s -primary-file %S/Inputs/other_file.swift
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// RUN: not %target-build-swift %s %S/Inputs/other_file.swift
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import _Differentiation
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// Error: conformance is in different file than witnesses.
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// expected-error @+1 {{type 'ConformingStruct' does not conform to protocol 'Protocol1'}}
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extension ConformingStruct: Protocol1 {}
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// No error: conformance is in same file as witnesses.
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extension ConformingStruct: Protocol2 {
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func internalMethod4(_ x: Float) -> Float {
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x
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}
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}
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public final class ConformingStructWithSupersetAttr: Protocol2 {}
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// rdar://70348904: Witness mismatch failure when a matching witness with a *superset* `@differentiable`
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// attribute is specified.
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//
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// Note that public witnesses are required to explicitly specify `@differentiable` attributes except
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// those w.r.t. parameters that have already been covered by an existing `@differentiable` attribute.
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extension ConformingStructWithSupersetAttr {
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// @differentiable(reverse, wrt: self) // Omitting this is okay.
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@differentiable(reverse)
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public func internalMethod4(_ x: Float) -> Float { x }
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}
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