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Doug Gregor
12a774abec
When emitting foreign class metadata (e.g., for an imported CF type), fill in the superclass when we have one. The superclass will itself be a foreign metadata candidate, so also register an initialization function that uniques the superclass metadata once we've picked the canonical foreign class metadata.
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
//===-- ForeignClassMetadataVisitor.h - foreign class metadata -*- 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 class useful for laying out foreign class metadata.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_FOREIGNCLASSMETADATAVISITOR_H
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#define SWIFT_IRGEN_FOREIGNCLASSMETADATAVISITOR_H
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#include "NominalMetadataVisitor.h"
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namespace swift {
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namespace irgen {
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/// A CRTP layout class for foreign class metadata.
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template <class Impl>
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class ForeignClassMetadataVisitor
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: public NominalMetadataVisitor<Impl> {
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using super = NominalMetadataVisitor<Impl>;
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protected:
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ClassDecl *Target;
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using super::asImpl;
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public:
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ForeignClassMetadataVisitor(IRGenModule &IGM, ClassDecl *target)
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: super(IGM), Target(target) {}
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void layout() {
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super::layout();
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asImpl().addNominalTypeDescriptor();
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asImpl().noteStartOfSuperClass();
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asImpl().addSuperClass();
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asImpl().addReservedWord();
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asImpl().addReservedWord();
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asImpl().addReservedWord();
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}
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bool requiresInitializationFunction() {
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return Target->getSuperclassDecl() &&
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Target->getSuperclassDecl()->isForeign();
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}
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CanType getTargetType() const {
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return Target->getDeclaredType()->getCanonicalType();
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}
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};
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/// An "implementation" of ForeignClassMetadataVisitor that just scans through
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/// the metadata layout, maintaining the offset of the next field.
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template <class Impl>
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class ForeignClassMetadataScanner : public ForeignClassMetadataVisitor<Impl> {
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typedef ForeignClassMetadataVisitor<Impl> super;
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protected:
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Size NextOffset = Size(0);
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ForeignClassMetadataScanner(IRGenModule &IGM, ClassDecl *target)
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: super(IGM, target) {}
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public:
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void addMetadataFlags() { addPointer(); }
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void addValueWitnessTable() { addPointer(); }
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void addNominalTypeDescriptor() { addPointer(); }
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void addSuperClass() { addPointer(); }
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void addReservedWord() { addPointer(); }
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private:
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void addPointer() {
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NextOffset += super::IGM.getPointerSize();
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}
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};
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} // end namespace irgen
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} // end namespace swift
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#endif // SWIFT_IRGEN_FOREIGNCLASSMETADATAVISITOR_H
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