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95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
//===--- Feature.h - Helpers related to Swift features ----------*- 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 - 2025 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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#ifndef SWIFT_BASIC_FEATURE_H
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#define SWIFT_BASIC_FEATURE_H
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#include "swift/Basic/LLVM.h"
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#include "llvm/ADT/StringRef.h"
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#include <optional>
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namespace swift {
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class LangOptions;
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/// Enumeration describing all of the named features.
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struct Feature {
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enum class InnerKind : uint16_t {
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#define LANGUAGE_FEATURE(FeatureName, SENumber, Description) FeatureName,
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#include "swift/Basic/Features.def"
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};
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InnerKind kind;
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constexpr Feature(InnerKind kind) : kind(kind) {}
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constexpr Feature(unsigned inputKind) : kind(InnerKind(inputKind)) {}
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constexpr operator InnerKind() const { return kind; }
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constexpr explicit operator unsigned() const { return unsigned(kind); }
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constexpr explicit operator size_t() const { return size_t(kind); }
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static constexpr unsigned getNumFeatures() {
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enum Features {
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#define LANGUAGE_FEATURE(FeatureName, SENumber, Description) FeatureName,
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#include "swift/Basic/Features.def"
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NumFeatures
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};
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return NumFeatures;
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}
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#define LANGUAGE_FEATURE(FeatureName, SENumber, Description) \
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static const Feature FeatureName;
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#include "swift/Basic/Features.def"
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/// Check whether the given feature is available in production compilers.
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bool isAvailableInProduction() const;
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/// Determine the in-source name of the given feature.
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llvm::StringRef getName() const;
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/// Determine whether the given feature supports migration mode.
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bool isMigratable() const;
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/// Determine whether this feature should be included in the
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/// module interface
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bool includeInModuleInterface() const;
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/// Determine whether the first feature is more recent (and thus implies
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/// the existence of) the second feature. Only meaningful for suppressible
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/// features.
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constexpr bool featureImpliesFeature(Feature implied) const {
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// Suppressible features are expected to be listed in order of
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// addition in Features.def.
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return (unsigned)kind < (unsigned)implied.kind;
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}
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/// Get the feature corresponding to this "future" feature, if there is one.
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static std::optional<Feature> getUpcomingFeature(StringRef name);
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/// Get the feature corresponding to this "experimental" feature, if there is
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/// one.
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static std::optional<Feature> getExperimentalFeature(StringRef name);
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/// Get the major language version in which this feature was introduced, or
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/// \c None if it does not have such a version.
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std::optional<unsigned> getLanguageVersion() const;
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};
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#define LANGUAGE_FEATURE(FeatureName, SENumber, Description) \
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constexpr inline Feature Feature::FeatureName = \
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Feature::InnerKind::FeatureName;
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#include "swift/Basic/Features.def"
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}
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#endif // SWIFT_BASIC_FEATURES_H
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