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