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  1. //===- llvm/Support/FileSystem/UniqueID.h - UniqueID for files --*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. // This file is cut out of llvm/Support/FileSystem.h to allow UniqueID to be
  10. // reused without bloating the includes.
  11. //
  12. //===----------------------------------------------------------------------===//
  13.  
  14. #ifndef LLVM_SUPPORT_FILESYSTEM_UNIQUEID_H
  15. #define LLVM_SUPPORT_FILESYSTEM_UNIQUEID_H
  16.  
  17. #include "llvm/ADT/DenseMapInfo.h"
  18. #include "llvm/ADT/Hashing.h"
  19. #include <cstdint>
  20. #include <utility>
  21.  
  22. namespace llvm {
  23. namespace sys {
  24. namespace fs {
  25.  
  26. class UniqueID {
  27.   uint64_t Device;
  28.   uint64_t File;
  29.  
  30. public:
  31.   UniqueID() = default;
  32.   UniqueID(uint64_t Device, uint64_t File) : Device(Device), File(File) {}
  33.  
  34.   bool operator==(const UniqueID &Other) const {
  35.     return Device == Other.Device && File == Other.File;
  36.   }
  37.   bool operator!=(const UniqueID &Other) const { return !(*this == Other); }
  38.   bool operator<(const UniqueID &Other) const {
  39.     /// Don't use std::tie since it bloats the compile time of this header.
  40.     if (Device < Other.Device)
  41.       return true;
  42.     if (Other.Device < Device)
  43.       return false;
  44.     return File < Other.File;
  45.   }
  46.  
  47.   uint64_t getDevice() const { return Device; }
  48.   uint64_t getFile() const { return File; }
  49. };
  50.  
  51. } // end namespace fs
  52. } // end namespace sys
  53.  
  54. // Support UniqueIDs as DenseMap keys.
  55. template <> struct DenseMapInfo<llvm::sys::fs::UniqueID> {
  56.   static inline llvm::sys::fs::UniqueID getEmptyKey() {
  57.     auto EmptyKey = DenseMapInfo<std::pair<uint64_t, uint64_t>>::getEmptyKey();
  58.     return {EmptyKey.first, EmptyKey.second};
  59.   }
  60.  
  61.   static inline llvm::sys::fs::UniqueID getTombstoneKey() {
  62.     auto TombstoneKey =
  63.         DenseMapInfo<std::pair<uint64_t, uint64_t>>::getTombstoneKey();
  64.     return {TombstoneKey.first, TombstoneKey.second};
  65.   }
  66.  
  67.   static hash_code getHashValue(const llvm::sys::fs::UniqueID &Tag) {
  68.     return hash_value(std::make_pair(Tag.getDevice(), Tag.getFile()));
  69.   }
  70.  
  71.   static bool isEqual(const llvm::sys::fs::UniqueID &LHS,
  72.                       const llvm::sys::fs::UniqueID &RHS) {
  73.     return LHS == RHS;
  74.   }
  75. };
  76.  
  77. } // end namespace llvm
  78.  
  79. #endif // LLVM_SUPPORT_FILESYSTEM_UNIQUEID_H
  80.