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3ce1ba3e65
"minimal" is defined as the set of requirements that would be passed to a function with the type's generic signature that takes the thick metadata of the parent type as its only argument.
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
//===--- StructMetadataLayout.h - CRTP for struct 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 - 2016 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 http://swift.org/LICENSE.txt for license information
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// See http://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 struct metadata.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_STRUCTMETADATALAYOUT_H
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#define SWIFT_IRGEN_STRUCTMETADATALAYOUT_H
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#include "MetadataLayout.h"
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namespace swift {
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namespace irgen {
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/// A CRTP class for laying out struct metadata.
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///
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/// This produces an object corresponding to the StructMetadata type.
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/// It does not itself doing anything special for metadata templates.
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template <class Impl> class StructMetadataLayout : public MetadataLayout<Impl> {
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typedef MetadataLayout<Impl> super;
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protected:
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using super::IGM;
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using super::asImpl;
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/// The struct.
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StructDecl *const Target;
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StructMetadataLayout(IRGenModule &IGM, StructDecl *target)
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: super(IGM), Target(target) {}
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public:
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void layout() {
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// Metadata header.
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super::layout();
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// StructMetadata header.
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asImpl().addNominalTypeDescriptor();
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asImpl().addParentMetadataRef();
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// If changing this layout, you must update the magic number in
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// emitParentMetadataRef.
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// Struct field offsets.
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asImpl().noteStartOfFieldOffsets();
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for (VarDecl *prop : Target->getStoredProperties())
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asImpl().addFieldOffset(prop);
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// Instantiation-specific.
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asImpl().addGenericFields(Target, Target->getDeclaredTypeInContext());
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}
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// Note the start of the field offset vector.
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void noteStartOfFieldOffsets() {}
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};
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/// An "implementation" of StructMetadataLayout 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 StructMetadataScanner : public StructMetadataLayout<Impl> {
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typedef StructMetadataLayout<Impl> super;
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protected:
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Size NextOffset = Size(0);
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StructMetadataScanner(IRGenModule &IGM, StructDecl *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 addParentMetadataRef() { addPointer(); }
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void addFieldOffset(VarDecl*) { addPointer(); }
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void addGenericArgument(CanType argument) { addPointer(); }
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void addGenericWitnessTable(CanType argument, ProtocolConformanceRef conf) {
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addPointer();
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}
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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
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