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