FileEntry.h revision 351278 
1//===- FileEntry.h ----------------------------------------------*- C++ -*-===//
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#ifndef LLVM_DEBUGINFO_GSYM_FILEENTRY_H
11#define LLVM_DEBUGINFO_GSYM_FILEENTRY_H
12
13#include "llvm/ADT/DenseMapInfo.h"
14#include "llvm/ADT/Hashing.h"
15#include <functional>
16#include <stdint.h>
17#include <utility>
18
19namespace llvm {
20namespace gsym {
21
22/// Files in GSYM are contained in FileEntry structs where we split the
23/// directory and basename into two different strings in the string
24/// table. This allows paths to shared commont directory and filename
25/// strings and saves space.
26struct FileEntry {
27
28  /// Offsets in the string table.
29  /// @{
30  uint32_t Dir = 0;
31  uint32_t Base = 0;
32  /// @}
33
34  FileEntry() = default;
35  FileEntry(uint32_t D, uint32_t B) : Dir(D), Base(B) {}
36
37  // Implement operator== so that FileEntry can be used as key in
38  // unordered containers.
39  bool operator==(const FileEntry &RHS) const {
40    return Base == RHS.Base && Dir == RHS.Dir;
41  };
42  bool operator!=(const FileEntry &RHS) const {
43    return Base != RHS.Base || Dir != RHS.Dir;
44  };
45};
46
47} // namespace gsym
48
49template <> struct DenseMapInfo<gsym::FileEntry> {
50  static inline gsym::FileEntry getEmptyKey() {
51    uint32_t key = DenseMapInfo<uint32_t>::getEmptyKey();
52    return gsym::FileEntry(key, key);
53  }
54  static inline gsym::FileEntry getTombstoneKey() {
55    uint32_t key = DenseMapInfo<uint32_t>::getTombstoneKey();
56    return gsym::FileEntry(key, key);
57  }
58  static unsigned getHashValue(const gsym::FileEntry &Val) {
59    return llvm::hash_combine(DenseMapInfo<uint32_t>::getHashValue(Val.Dir),
60                              DenseMapInfo<uint32_t>::getHashValue(Val.Base));
61  }
62  static bool isEqual(const gsym::FileEntry &LHS, const gsym::FileEntry &RHS) {
63    return LHS == RHS;
64  }
65};
66
67} // namespace llvm
68#endif // #ifndef LLVM_DEBUGINFO_GSYM_FILEENTRY_H
69