| 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(arg: std::make_pair(x: Tag.getDevice(), y: 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 |