mirror of
https://github.com/apple/swift.git
synced 2025-12-21 12:14:44 +01:00
90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
//===--- 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 embeddedLayout() {
|
|
// The embedded layout consists of:
|
|
// -1 : vwt
|
|
// 0 : metadata flags
|
|
super::layout();
|
|
}
|
|
|
|
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
|