MetadataImpl.h

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//===- MetadataImpl.h - Helpers for implementing metadata -----------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file has private helpers for implementing metadata types.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_IR_METADATAIMPL_H
#define LLVM_IR_METADATAIMPL_H

#include "llvm/ADT/DenseSet.h"
#include "llvm/IR/Metadata.h"

namespace llvm {

template <class T, class InfoT>
static T *getUniqued(DenseSet<T *, InfoT> &Store,
                     const typename InfoT::KeyTy &Key) {
  auto I = Store.find_as(Key);
  return I == Store.end() ? nullptr : *I;
}

template <class T> T *MDNode::storeImpl(T *N, StorageType Storage) {
  switch (Storage) {
  case Uniqued:
    llvm_unreachable("Cannot unique without a uniquing-store");
  case Distinct:
    N->storeDistinctInContext();
    break;
  case Temporary:
    break;
  }
  return N;
}

template <class T, class StoreT>
T *MDNode::storeImpl(T *N, StorageType Storage, StoreT &Store) {
  switch (Storage) {
  case Uniqued:
    Store.insert(N);
    break;
  case Distinct:
    N->storeDistinctInContext();
    break;
  case Temporary:
    break;
  }
  return N;
}

} // end namespace llvm

#endif