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77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
//===--- FeatureSet.h - Language feature support ----------------*- 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) 2024 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_AST_FEATURES_H
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#define SWIFT_AST_FEATURES_H
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#include "swift/AST/Decl.h"
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#include "swift/Basic/Feature.h"
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#include "swift/Basic/FixedBitSet.h"
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namespace swift {
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using BasicFeatureSet =
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FixedBitSet<Feature::getNumFeatures(), Feature::InnerKind>;
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class FeatureSet {
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BasicFeatureSet required;
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// Stored inverted: index i actually represents
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// Feature(numFeatures() - i)
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//
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// This is the easiest way of letting us iterate from largest to
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// smallest, i.e. from the newest to the oldest feature, which is
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// the order in which we need to emit #if clauses.
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using SuppressibleFeatureSet = FixedBitSet<Feature::getNumFeatures(), size_t>;
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SuppressibleFeatureSet suppressible;
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public:
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class SuppressibleGenerator {
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SuppressibleFeatureSet::iterator i, e;
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friend class FeatureSet;
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SuppressibleGenerator(const SuppressibleFeatureSet &set)
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: i(set.begin()), e(set.end()) {}
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public:
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bool empty() const { return i == e; }
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Feature next() { return Feature(Feature::getNumFeatures() - *i++); }
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};
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bool empty() const { return required.empty() && suppressible.empty(); }
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bool hasAnyRequired() const { return !required.empty(); }
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const BasicFeatureSet &requiredFeatures() const { return required; }
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bool hasAnySuppressible() const { return !suppressible.empty(); }
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SuppressibleGenerator generateSuppressibleFeatures() const {
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return SuppressibleGenerator(suppressible);
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}
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enum InsertOrRemove : bool { Insert = true, Remove = false };
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void collectFeaturesUsed(Decl *decl, InsertOrRemove operation);
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private:
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void collectRequiredFeature(Feature feature, InsertOrRemove operation);
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void collectSuppressibleFeature(Feature feature, InsertOrRemove operation);
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};
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/// Get the set of features that are uniquely used by this declaration, and are
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/// not part of the enclosing context.
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FeatureSet getUniqueFeaturesUsed(Decl *decl);
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bool usesFeatureIsolatedDeinit(const Decl *decl);
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} // end namespace swift
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#endif /* SWIFT_AST_FEATURES_H */
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