| //===--- TupleMetadataVisitor.h - CRTP for tuple 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 tuple metadata. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef SWIFT_IRGEN_TUPLEMETADATALAYOUT_H |
| #define SWIFT_IRGEN_TUPLEMETADATALAYOUT_H |
| |
| //#include "NominalMetadataVisitor.h" |
| |
| namespace swift { |
| namespace irgen { |
| |
| /// A CRTP class for laying out tuple metadata. |
| /// |
| /// This produces an object corresponding to a TupleTypeMetadata type. |
| /// It does not itself doing anything special for metadata templates. |
| template <class Impl> struct TupleMetadataVisitor |
| : public MetadataVisitor<Impl> { |
| using super = MetadataVisitor<Impl>; |
| |
| protected: |
| using super::asImpl; |
| |
| TupleType *const Target; |
| |
| TupleMetadataVisitor(IRGenModule &IGM, TupleType *const target) |
| : super(IGM), Target(target) {} |
| |
| public: |
| void layout() { |
| super::layout(); |
| |
| asImpl().addNumElementsInfo(); |
| asImpl().addLabelsInfo(); |
| |
| for (unsigned i = 0, n = Target->getNumElements(); i < n; ++i) { |
| asImpl().addElement(i, Target->getElement(i)); |
| } |
| } |
| }; |
| |
| /// An "implementation" of TupleMetadataVisitor that just scans through |
| /// the metadata layout, maintaining the offset of all tuple elements. |
| template <class Impl> class TupleMetadataScanner |
| : public TupleMetadataVisitor<Impl> { |
| using super = TupleMetadataVisitor<Impl>; |
| |
| protected: |
| Size NextOffset = Size(0); |
| |
| TupleMetadataScanner(IRGenModule &IGM, TupleType *const target) |
| : super(IGM, target) {} |
| |
| public: |
| void addValueWitnessTable() { addPointer(); } |
| void addMetadataFlags() { addPointer(); } |
| void addNumElementsInfo() { addPointer(); } |
| void addLabelsInfo() { addPointer(); } |
| void addElement(unsigned idx, |
| const TupleTypeElt &e) { addPointer(); addPointer(); } |
| |
| private: |
| void addPointer() { NextOffset += super::IGM.getPointerSize(); } |
| }; |
| |
| } // end namespace irgen |
| } // end namespace swift |
| |
| #endif |