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b0e424f469
Extracted a base CRTP class MetadataVisitor from NominalMetadataVisitor Added new tuple metadata visitors extending the new MetadataVisitor
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
//===--- TupleMetadataVisitor.h - CRTP for tuple 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 tuple metadata.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_TUPLEMETADATALAYOUT_H
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#define SWIFT_IRGEN_TUPLEMETADATALAYOUT_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 class for laying out tuple metadata.
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///
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/// This produces an object corresponding to a TupleTypeMetadata type.
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/// It does not itself doing anything special for metadata templates.
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template <class Impl> struct TupleMetadataVisitor
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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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TupleType *const Target;
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TupleMetadataVisitor(IRGenModule &IGM, TupleType *const target)
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: super(IGM), Target(target) {}
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public:
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void layout() {
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super::layout();
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asImpl().addNumElementsInfo();
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asImpl().addLabelsInfo();
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for (unsigned i = 0, n = Target->getNumElements(); i < n; ++i) {
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asImpl().addElement(i, Target->getElement(i));
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}
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}
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};
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/// An "implementation" of TupleMetadataVisitor that just scans through
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/// the metadata layout, maintaining the offset of all tuple elements.
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template <class Impl> class TupleMetadataScanner
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: public TupleMetadataVisitor<Impl> {
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using super = TupleMetadataVisitor<Impl>;
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protected:
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Size NextOffset = Size(0);
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TupleMetadataScanner(IRGenModule &IGM, TupleType *const target)
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: super(IGM, target) {}
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public:
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void addValueWitnessTable() { addPointer(); }
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void addMetadataFlags() { addPointer(); }
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void addNumElementsInfo() { addPointer(); }
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void addLabelsInfo() { addPointer(); }
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void addElement(unsigned idx,
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const TupleTypeElt &e) { addPointer(); addPointer(); }
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private:
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void addPointer() { NextOffset += super::IGM.getPointerSize(); }
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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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