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If the feature is enabled, base the requirement for the underscored accessors on the availability of the non-underscored accessors. If the (non-underscored) accessor's was available earlier than the feature, interpret that to mean that the underscored version was available in that earlier version, and require the underscored version. The goal is to ensure that the ABI is preserved, so long as the simplest migration is done (namely, deleting the underscores from the old accessors). For modify2, cache the required-ness in the same way that it is cached for modify.
88 lines
3.6 KiB
C++
88 lines
3.6 KiB
C++
//===--- FeatureAvailability.def - Availability Metaprogramming -*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines macros used for macro-metaprogramming with feature
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// availability.
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//
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//===----------------------------------------------------------------------===//
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/// FEATURE(N, V)
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/// N - The name of the feature (in UpperCamelCase).
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/// V - The Swift version number, as a tuple, or FUTURE.
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///
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/// The feature Foo turns into two methods on ASTContext:
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/// getFooRuntimeAvailability(), which returns the exact version provided
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/// here, and getFooAvailability(), which maps that version into a version
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/// of the target OS. Because both of these methods exist, it is a bad idea
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/// to use a feature name that ends in "Runtime", or people might get very
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/// confused.
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#ifndef FEATURE
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#define FEATURE(N, V)
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#endif
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/// FUTURE
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///
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/// The version to use for future support.
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#ifndef FUTURE
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#define FUTURE (99, 99)
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#endif
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FEATURE(ObjCMetadataUpdateCallback, (5, 0))
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FEATURE(ObjCGetClassHook, (5, 0))
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FEATURE(OpaqueType, (5, 1))
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FEATURE(ObjCClassStubs, (5, 1))
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FEATURE(BackDeployedConcurrency, (5, 1))
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FEATURE(TypesInAbstractMetadataState, (5, 2))
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FEATURE(PrespecializedGenericMetadata, (5, 4))
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FEATURE(CompareTypeContextDescriptors, (5, 4))
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FEATURE(CompareProtocolConformanceDescriptors, (5, 4))
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FEATURE(IntermodulePrespecializedGenericMetadata, (5, 4))
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FEATURE(Concurrency, (5, 5))
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FEATURE(MultiPayloadEnumTagSinglePayload, (5, 6))
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FEATURE(ObjCIsUniquelyReferenced, (5, 6))
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// Metadata and casting support for parameterized existential types
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FEATURE(ParameterizedExistential, (5, 7))
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FEATURE(VariadicGenericType, (5, 9))
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FEATURE(SignedConformsToProtocol, (5, 9))
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FEATURE(ConcurrencyDiscardingTaskGroup, (5, 9))
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FEATURE(ConcurrencyDistributedActorWithCustomExecutor, (5, 9))
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FEATURE(SignedDescriptor, (5, 9))
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FEATURE(ObjCSymbolicReferences, (6, 0))
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FEATURE(TypedThrows, (6, 0))
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FEATURE(StaticReadOnlyArrays, (6, 0))
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FEATURE(SwiftExceptionPersonality, (6, 0))
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// Metadata support for @isolated(any) function types
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FEATURE(IsolatedAny, (6, 0))
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FEATURE(NoncopyableGenerics, (6, 0))
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FEATURE(InitRawStructMetadata, (6, 0))
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FEATURE(TaskExecutor, FUTURE)
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FEATURE(Differentiation, FUTURE)
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FEATURE(ClearSensitive, FUTURE)
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FEATURE(UpdatePureObjCClassMetadata, FUTURE)
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FEATURE(ValueGenericType, FUTURE)
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FEATURE(InitRawStructMetadata2, FUTURE)
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// TODO: CoroutineAccessors: Change to correct version number.
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FEATURE(CoroutineAccessors, FUTURE)
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#undef FEATURE
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#undef FUTURE
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