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73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
//===--- NominalMetadataVisitor.h - CRTP for metadata layout ----*- 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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// A CRTP helper class for visiting all of the fields in a nominal type
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// metadata object.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_NOMINALMETADATAVISITOR_H
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#define SWIFT_IRGEN_NOMINALMETADATAVISITOR_H
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#include "GenericRequirement.h"
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#include "GenProto.h"
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#include "GenMeta.h"
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#include "IRGenModule.h"
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#include "MetadataVisitor.h"
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namespace swift {
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namespace irgen {
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/// A CRTP class for laying out type metadata for nominal types. Note that this
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/// does *not* handle the metadata template stuff.
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template <class Impl> class NominalMetadataVisitor
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: public MetadataVisitor<Impl> {
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using super = MetadataVisitor<Impl>;
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protected:
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using super::asImpl;
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NominalMetadataVisitor(IRGenModule &IGM) : super(IGM) {}
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public:
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/// Add fields related to the generics of this class declaration.
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/// TODO: don't add new fields that are implied by the superclass
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/// fields. e.g., if B<T> extends A<T>, the witness for T in A's
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/// section should be enough.
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template <class... T>
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void addGenericFields(NominalTypeDecl *typeDecl, T &&...args) {
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// The archetype order here needs to be consistent with
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// NominalTypeDescriptorBase::addGenericParams.
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// Note that we intentionally don't std::forward 'args'.
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asImpl().noteStartOfGenericRequirements(args...);
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GenericTypeRequirements requirements(super::IGM, typeDecl);
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for (auto reqt : requirements.getRequirements()) {
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asImpl().addGenericRequirement(reqt, args...);
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}
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asImpl().noteEndOfGenericRequirements(args...);
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}
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template <class... T>
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void noteStartOfGenericRequirements(T &&...args) {}
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template <class... T>
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void noteEndOfGenericRequirements(T &&...args) {}
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};
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} // end namespace irgen
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} // end namespace swift
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#endif
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