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//===-- ForeignClassMetadataVisitor.h - foreign class metadata -*- C++ --*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// A CRTP class useful for laying out foreign class metadata.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_IRGEN_FOREIGNCLASSMETADATAVISITOR_H
#define SWIFT_IRGEN_FOREIGNCLASSMETADATAVISITOR_H
#include "NominalMetadataVisitor.h"
namespace swift {
namespace irgen {
/// A CRTP layout class for foreign class metadata.
template <class Impl>
class ForeignClassMetadataVisitor
: public NominalMetadataVisitor<Impl> {
using super = NominalMetadataVisitor<Impl>;
protected:
ClassDecl *Target;
using super::asImpl;
public:
ForeignClassMetadataVisitor(IRGenModule &IGM, ClassDecl *target)
: super(IGM), Target(target) {}
void layout() {
asImpl().addLayoutStringPointer();
super::layout();
asImpl().addNominalTypeDescriptor();
asImpl().addSuperclass();
asImpl().addReservedWord();
}
CanType getTargetType() const {
return Target->getDeclaredType()->getCanonicalType();
}
};
/// An "implementation" of ForeignClassMetadataVisitor that just scans through
/// the metadata layout, maintaining the offset of the next field.
template <class Impl>
class ForeignClassMetadataScanner : public ForeignClassMetadataVisitor<Impl> {
using super = ForeignClassMetadataVisitor<Impl>;
protected:
Size NextOffset = Size(0);
ForeignClassMetadataScanner(IRGenModule &IGM, ClassDecl *target)
: super(IGM, target) {}
public:
void addMetadataFlags() { addPointer(); }
void addLayoutStringPointer() { addPointer(); }
void addValueWitnessTable() { addPointer(); }
void addNominalTypeDescriptor() { addPointer(); }
void addSuperclass() { addPointer(); }
void addReservedWord() { addPointer(); }
private:
void addPointer() {
NextOffset += super::IGM.getPointerSize();
}
};
template <class Impl>
class ForeignReferenceTypeMetadataVisitor
: public NominalMetadataVisitor<Impl> {
using super = NominalMetadataVisitor<Impl>;
protected:
ClassDecl *Target;
using super::asImpl;
public:
ForeignReferenceTypeMetadataVisitor(IRGenModule &IGM, ClassDecl *target)
: super(IGM), Target(target) {}
void layout() {
asImpl().addLayoutStringPointer();
super::layout();
asImpl().addNominalTypeDescriptor();
asImpl().addReservedWord();
}
CanType getTargetType() const {
return Target->getDeclaredType()->getCanonicalType();
}
};
} // end namespace irgen
} // end namespace swift
#endif // SWIFT_IRGEN_FOREIGNCLASSMETADATAVISITOR_H
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