//===--- Features.def - Swift Features Metaprogramming ----------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file defines macros used for macro-metaprogramming with language
// features.
//
//
// LANGUAGE_FEATURE(FeatureName, SENumber, Description, Option)
//
//   The LANGUAGE_FEATURE macro describes each named feature that is
//   introduced in Swift. It allows Swift code to check for a particular
//   feature with "#if $FeatureName" in source code.
//
//     FeatureName: The name given to this feature to be used in source code,
//       e.g., AsyncAwait.
//     SENumber: The number assigned to this feature in the Swift Evolution
//       process, or 0 if there isn't one.
//     Description: A string literal describing the feature.
//     Option: either a reference to a language option in the form
//       "langOpts.<option name>" or "true" to indicate that it's always
//       enabled.
//
// Suppressible language features can be suppressed when printing
// an interface without having to suppress the entire declaration they're
// contained within.  The declaration will be emitted multiple times,
// each with a subset of the suppressible features.  To avoid combinatoric
// re-emission, we assume a linear history: later features in this file
// imply the existence of earlier features.  (This only needs to apply to
// suppressible features.)
//
//===----------------------------------------------------------------------===//

#ifndef LANGUAGE_FEATURE
#  error define LANGUAGE_FEATURE before including Features.def
#endif

#ifndef SUPPRESSIBLE_LANGUAGE_FEATURE
#define SUPPRESSIBLE_LANGUAGE_FEATURE(FeatureName, SENumber, Description, Option) \
  LANGUAGE_FEATURE(FeatureName, SENumber, Description, Option)
#endif

#ifndef UPCOMING_FEATURE
#  define UPCOMING_FEATURE(FeatureName, SENumber, Version)   \
     LANGUAGE_FEATURE(FeatureName, SENumber, #FeatureName, \
                      langOpts.hasFeature(#FeatureName))
#endif

#ifndef EXPERIMENTAL_FEATURE
// Warning: setting `AvailableInProd` to `true` on a feature means that the flag
//          cannot be dropped in the future.
#  define EXPERIMENTAL_FEATURE(FeatureName, AvailableInProd)  \
     LANGUAGE_FEATURE(FeatureName, 0, #FeatureName, \
                      langOpts.hasFeature(#FeatureName))
#endif

#ifndef EXPERIMENTAL_FEATURE_EXCLUDED_FROM_MODULE_INTERFACE
#  define EXPERIMENTAL_FEATURE_EXCLUDED_FROM_MODULE_INTERFACE(FeatureName, AvailableInProd) \
     EXPERIMENTAL_FEATURE(FeatureName, AvailableInProd)
#endif

LANGUAGE_FEATURE(AsyncAwait, 296, "async/await", true)
LANGUAGE_FEATURE(EffectfulProp, 310, "Effectful properties", true)
LANGUAGE_FEATURE(MarkerProtocol, 0, "@_marker protocol", true)
LANGUAGE_FEATURE(Actors, 0, "actors", true)
LANGUAGE_FEATURE(ConcurrentFunctions, 0, "@concurrent functions", true)
LANGUAGE_FEATURE(RethrowsProtocol, 0, "@rethrows protocol", true)
LANGUAGE_FEATURE(GlobalActors, 316, "Global actors", true)
LANGUAGE_FEATURE(BuiltinJob, 0, "Builtin.Job type", true)
LANGUAGE_FEATURE(Sendable, 0, "Sendable and @Sendable", true)
LANGUAGE_FEATURE(BuiltinExecutor, 0, "Builtin.Executor type", true)
LANGUAGE_FEATURE(BuiltinContinuation, 0, "Continuation builtins", true)
LANGUAGE_FEATURE(BuiltinHopToActor, 0, "Builtin.HopToActor", true)
LANGUAGE_FEATURE(BuiltinTaskGroupWithArgument, 0, "TaskGroup builtins", true)
LANGUAGE_FEATURE(InheritActorContext, 0, "@_inheritActorContext attribute", true)
LANGUAGE_FEATURE(ImplicitSelfCapture, 0, "@_implicitSelfCapture attribute", true)
LANGUAGE_FEATURE(BuiltinBuildExecutor, 0, "Executor-building builtins", true)
LANGUAGE_FEATURE(BuiltinBuildComplexEqualityExecutor, 0, "Executor-building for 'complexEquality executor' builtins", true)
LANGUAGE_FEATURE(BuiltinBuildMainExecutor, 0, "MainActor executor building builtin", true)
LANGUAGE_FEATURE(BuiltinCreateAsyncTaskInGroup, 0, "MainActor executor building builtin", true)
LANGUAGE_FEATURE(BuiltinCopy, 0, "Builtin.copy()", true)
LANGUAGE_FEATURE(BuiltinStackAlloc, 0, "Builtin.stackAlloc", true)
LANGUAGE_FEATURE(BuiltinUnprotectedStackAlloc, 0, "Builtin.unprotectedStackAlloc", true)
LANGUAGE_FEATURE(BuiltinTaskRunInline, 0, "Builtin.taskRunInline", true)
LANGUAGE_FEATURE(BuiltinUnprotectedAddressOf, 0, "Builtin.unprotectedAddressOf", true)
LANGUAGE_FEATURE(NewCxxMethodSafetyHeuristics, 0, "Only import C++ methods that return pointers (projections) on owned types as unsafe", true)
SUPPRESSIBLE_LANGUAGE_FEATURE(SpecializeAttributeWithAvailability, 0, "@_specialize attribute with availability", true)
LANGUAGE_FEATURE(BuiltinAssumeAlignment, 0, "Builtin.assumeAlignment", true)
LANGUAGE_FEATURE(BuiltinCreateTaskGroupWithFlags, 0, "Builtin.createTaskGroupWithFlags", true)
SUPPRESSIBLE_LANGUAGE_FEATURE(UnsafeInheritExecutor, 0, "@_unsafeInheritExecutor", true)
SUPPRESSIBLE_LANGUAGE_FEATURE(PrimaryAssociatedTypes2, 346, "Primary associated types", true)
SUPPRESSIBLE_LANGUAGE_FEATURE(UnavailableFromAsync, 0, "@_unavailableFromAsync", true)
SUPPRESSIBLE_LANGUAGE_FEATURE(NoAsyncAvailability, 340, "@available(*, noasync)", true)
LANGUAGE_FEATURE(BuiltinIntLiteralAccessors, 368, "Builtin.IntLiteral accessors", true)
LANGUAGE_FEATURE(Macros, 0, "Macros", hasSwiftSwiftParser)
LANGUAGE_FEATURE(
    FreestandingExpressionMacros, 382, "Expression macros",
        hasSwiftSwiftParser)
LANGUAGE_FEATURE(AttachedMacros, 389, "Attached macros", hasSwiftSwiftParser)
LANGUAGE_FEATURE(ExtensionMacros, 402, "Extension macros", hasSwiftSwiftParser)
LANGUAGE_FEATURE(MoveOnly, 390, "noncopyable types", true)
LANGUAGE_FEATURE(MoveOnlyResilientTypes, 390, "non-@frozen noncopyable types with library evolution", true)
LANGUAGE_FEATURE(ParameterPacks, 393, "Value and type parameter packs", true)
SUPPRESSIBLE_LANGUAGE_FEATURE(LexicalLifetimes, 0, "@_eagerMove/@_noEagerMove/@_lexicalLifetimes annotations", true)
LANGUAGE_FEATURE(FreestandingMacros, 397, "freestanding declaration macros", true)
SUPPRESSIBLE_LANGUAGE_FEATURE(RetroactiveAttribute, 364, "@retroactive", true)

UPCOMING_FEATURE(ConciseMagicFile, 274, 6)
UPCOMING_FEATURE(ForwardTrailingClosures, 286, 6)
UPCOMING_FEATURE(CompleteConcurrency, 0337, 6)
UPCOMING_FEATURE(BareSlashRegexLiterals, 354, 6)
UPCOMING_FEATURE(DeprecateApplicationMain, 383, 6)
UPCOMING_FEATURE(ImportObjcForwardDeclarations, 384, 6)
UPCOMING_FEATURE(DisableOutwardActorInference, 401, 6)
UPCOMING_FEATURE(InternalImportsByDefault, 409, 6)
UPCOMING_FEATURE(FullTypedThrows, 413, 6)

UPCOMING_FEATURE(ExistentialAny, 335, 7)

EXPERIMENTAL_FEATURE(StaticAssert, false)
EXPERIMENTAL_FEATURE(NamedOpaqueTypes, false)
EXPERIMENTAL_FEATURE(FlowSensitiveConcurrencyCaptures, false)
EXPERIMENTAL_FEATURE(CodeItemMacros, false)
EXPERIMENTAL_FEATURE(BodyMacros, true)
EXPERIMENTAL_FEATURE(TupleConformances, false)

SUPPRESSIBLE_LANGUAGE_FEATURE(ExtensionMacroAttr, 0, "@attached(extension)", true)

// Whether to enable @_used and @_section attributes
EXPERIMENTAL_FEATURE(SymbolLinkageMarkers, true)

// Whether to compile scripts lazily in immediate mode
EXPERIMENTAL_FEATURE(LazyImmediate, false)

// FIXME: MoveOnlyClasses is not intended to be in production,
// but our tests currently rely on it, and we want to run those
// tests in non-asserts builds too.
EXPERIMENTAL_FEATURE(MoveOnlyClasses, true)
EXPERIMENTAL_FEATURE(NoImplicitCopy, true)
EXPERIMENTAL_FEATURE(OldOwnershipOperatorSpellings, true)
EXPERIMENTAL_FEATURE(MoveOnlyEnumDeinits, true)
EXPERIMENTAL_FEATURE(MoveOnlyTuples, true)
EXPERIMENTAL_FEATURE(MoveOnlyPartialConsumption, true)

EXPERIMENTAL_FEATURE(OneWayClosureParameters, false)
EXPERIMENTAL_FEATURE(TypeWitnessSystemInference, false)
EXPERIMENTAL_FEATURE(LayoutPrespecialization, true)

EXPERIMENTAL_FEATURE(AccessLevelOnImport, true)

/// Whether to enable experimental layout string value witnesses
EXPERIMENTAL_FEATURE_EXCLUDED_FROM_MODULE_INTERFACE(LayoutStringValueWitnesses, true)
EXPERIMENTAL_FEATURE_EXCLUDED_FROM_MODULE_INTERFACE(LayoutStringValueWitnessesInstantiation, true)

/// Whether to enable experimental differentiable programming features:
/// `@differentiable` declaration attribute, etc.
EXPERIMENTAL_FEATURE(DifferentiableProgramming, false)

/// Whether to enable forward mode differentiation.
EXPERIMENTAL_FEATURE(ForwardModeDifferentiation, false)

/// Whether to enable experimental `AdditiveArithmetic` derived
/// conformances.
EXPERIMENTAL_FEATURE(AdditiveArithmeticDerivedConformances, false)

/// Whether Objective-C completion handler parameters are imported as
/// @Sendable.
EXPERIMENTAL_FEATURE(SendableCompletionHandlers, false)

/// Enables opaque type erasure without also enabling implict dynamic
EXPERIMENTAL_FEATURE(OpaqueTypeErasure, false)

/// Whether to perform round-trip testing of the Swift Swift parser.
EXPERIMENTAL_FEATURE(ParserRoundTrip, false)

/// Whether to perform validation of the parse tree produced by the Swift
/// Swift parser.
EXPERIMENTAL_FEATURE(ParserValidation, false)

/// Whether to emit diagnostics from the new parser first, and only emit
/// diagnostics from the existing parser when there are none from the new
/// parser.
EXPERIMENTAL_FEATURE(ParserDiagnostics, false)

/// Enables implicit some while also enabling existential `any`
EXPERIMENTAL_FEATURE(ImplicitSome, false)

/// Parse using the Swift (swift-syntax) parser and use ASTGen to generate the
/// corresponding syntax tree.
EXPERIMENTAL_FEATURE(ParserASTGen, false)

/// Parse using the Swift (swift-syntax) parser and use ASTGen to generate the
/// corresponding syntax tree.
EXPERIMENTAL_FEATURE(BuiltinMacros, false)

/// Import C++ class templates as semantically-meaningless symbolic
/// Swift types and C++ methods as symbolic functions with blank
/// signatures.
EXPERIMENTAL_FEATURE(ImportSymbolicCXXDecls, false)

/// Generate bindings for functions that 'throw' in the C++ section of the generated Clang header.
EXPERIMENTAL_FEATURE(GenerateBindingsForThrowingFunctionsInCXX, false)

/// Enable reference bindings.
EXPERIMENTAL_FEATURE(ReferenceBindings, true)

/// Enable the explicit 'import Builtin' and allow Builtin usage.
EXPERIMENTAL_FEATURE(BuiltinModule, true)

// Enable strict concurrency.
EXPERIMENTAL_FEATURE(StrictConcurrency, true)

/// Region Based Isolation testing using the TransferNonSendable pass
EXPERIMENTAL_FEATURE(RegionBasedIsolation, false)

/// Within strict concurrency, narrow global variable isolation requirements.
EXPERIMENTAL_FEATURE(GlobalConcurrency, false)

/// Allow default values to require isolation at the call-site.
EXPERIMENTAL_FEATURE(IsolatedDefaultValues, false)

/// Enable extended callbacks (with additional parameters) to be used when the
/// "playground transform" is enabled.
EXPERIMENTAL_FEATURE(PlaygroundExtendedCallbacks, true)

/// Enable 'then' statements.
EXPERIMENTAL_FEATURE(ThenStatements, false)

/// Enable 'do' expressions.
EXPERIMENTAL_FEATURE(DoExpressions, false)

/// Enable the `@_rawLayout` attribute.
EXPERIMENTAL_FEATURE(RawLayout, true)

/// Enables the "embedded" swift mode (no runtime).
EXPERIMENTAL_FEATURE(Embedded, true)

/// Enables noncopyable generics
EXPERIMENTAL_FEATURE(NoncopyableGenerics, false)

/// Enables typed throws.
EXPERIMENTAL_FEATURE(TypedThrows, true)

/// Allow destructuring stored `let` bindings in structs.
EXPERIMENTAL_FEATURE(StructLetDestructuring, true)

/// Enable non-escapable type attributes and function attributes that support
/// lifetime-dependent results.
EXPERIMENTAL_FEATURE(NonEscapableTypes, false)

/// Enable the `@_extern` attribute.
EXPERIMENTAL_FEATURE(Extern, true)

// Infer Sendability of unapplied and partial applied methods,
// global functions and key paths.
EXPERIMENTAL_FEATURE(InferSendableFromCaptures, false)

/// Enable the `@_staticExclusiveOnly` attribute.
EXPERIMENTAL_FEATURE(StaticExclusiveOnly, true)

/// Enable the @extractConstantsFromMembers attribute.
EXPERIMENTAL_FEATURE(ExtractConstantsFromMembers, false)

/// Enable bitwise-copyable feature.
EXPERIMENTAL_FEATURE(BitwiseCopyable, true)

#undef EXPERIMENTAL_FEATURE_EXCLUDED_FROM_MODULE_INTERFACE
#undef EXPERIMENTAL_FEATURE
#undef UPCOMING_FEATURE
#undef SUPPRESSIBLE_LANGUAGE_FEATURE
#undef LANGUAGE_FEATURE
