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525e25603f
Previously, the various generic builders implemented the methods addGenericArgument and addGenericWitnessTable without being provided what argument or witness table they were to add (because it was not previously needed). Now, the GenericRequirement is passed along to both methods.
76 lines
2.4 KiB
C++
76 lines
2.4 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 "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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if (reqt.Protocol) {
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asImpl().addGenericWitnessTable(reqt, args...);
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} else {
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asImpl().addGenericArgument(reqt, args...);
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}
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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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