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//===- llvm/Support/FileSystem/UniqueID.h - UniqueID for files --*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is cut out of llvm/Support/FileSystem.h to allow UniqueID to be
// reused without bloating the includes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_FILESYSTEM_UNIQUEID_H
#define LLVM_SUPPORT_FILESYSTEM_UNIQUEID_H
#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/ADT/Hashing.h"
#include <cstdint>
#include <utility>
namespace llvm {
namespace sys {
namespace fs {
class UniqueID {
uint64_t Device;
uint64_t File;
public:
UniqueID() = default;
UniqueID(uint64_t Device, uint64_t File) : Device(Device), File(File) {}
bool operator==(const UniqueID &Other) const {
return Device == Other.Device && File == Other.File;
}
bool operator!=(const UniqueID &Other) const { return !(*this == Other); }
bool operator<(const UniqueID &Other) const {
/// Don't use std::tie since it bloats the compile time of this header.
if (Device < Other.Device)
return true;
if (Other.Device < Device)
return false;
return File < Other.File;
}
uint64_t getDevice() const { return Device; }
uint64_t getFile() const { return File; }
};
} // end namespace fs
} // end namespace sys
// Support UniqueIDs as DenseMap keys.
template <> struct DenseMapInfo<llvm::sys::fs::UniqueID> {
static inline llvm::sys::fs::UniqueID getEmptyKey() {
auto EmptyKey = DenseMapInfo<std::pair<uint64_t, uint64_t>>::getEmptyKey();
return {EmptyKey.first, EmptyKey.second};
}
static inline llvm::sys::fs::UniqueID getTombstoneKey() {
auto TombstoneKey =
DenseMapInfo<std::pair<uint64_t, uint64_t>>::getTombstoneKey();
return {TombstoneKey.first, TombstoneKey.second};
}
static hash_code getHashValue(const llvm::sys::fs::UniqueID &Tag) {
return hash_value(std::make_pair(Tag.getDevice(), Tag.getFile()));
}
static bool isEqual(const llvm::sys::fs::UniqueID &LHS,
const llvm::sys::fs::UniqueID &RHS) {
return LHS == RHS;
}
};
} // end namespace llvm
#endif // LLVM_SUPPORT_FILESYSTEM_UNIQUEID_H
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