lib/IR/MetadataImpl.h

   1 //===- MetadataImpl.h - Helpers for implementing metadata -----------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file has private helpers for implementing metadata types.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_IR_METADATAIMPL_H
  15 #define LLVM_IR_METADATAIMPL_H
  16
  17 #include "llvm/ADT/DenseSet.h"
  18 #include "llvm/IR/Metadata.h"
  19
  20 namespace llvm {
  21
  22 template <class T, class InfoT>
  23 static T *getUniqued(DenseSet<T *, InfoT> &Store,
  24                      const typename InfoT::KeyTy &Key) {
  25   auto I = Store.find_as(Key);
  26   return I == Store.end() ? nullptr : *I;
  27 }
  28
  29 template <class T> T *MDNode::storeImpl(T *N, StorageType Storage) {
  30   switch (Storage) {
  31   case Uniqued:
  32     llvm_unreachable("Cannot unique without a uniquing-store");
  33   case Distinct:
  34     N->storeDistinctInContext();
  35     break;
  36   case Temporary:
  37     break;
  38   }
  39   return N;
  40 }
  41
  42 template <class T, class StoreT>
  43 T *MDNode::storeImpl(T *N, StorageType Storage, StoreT &Store) {
  44   switch (Storage) {
  45   case Uniqued:
  46     Store.insert(N);
  47     break;
  48   case Distinct:
  49     N->storeDistinctInContext();
  50     break;
  51   case Temporary:
  52     break;
  53   }
  54   return N;
  55 }
  56
  57 } // end namespace llvm
  58
  59 #endif