include/llvm/DebugInfo/GSYM/FileEntry.h

   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