DIEHash.h revision 11de8539cb5d4c5f33b39aabcd38d65b05c176a7 
1//===-- llvm/CodeGen/DIEHash.h - Dwarf Hashing Framework -------*- 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// This file contains support for DWARF4 hashing of DIEs.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/Support/MD5.h"
15
16namespace llvm {
17
18class CompileUnit;
19
20/// \brief An object containing the capability of hashing and adding hash
21/// attributes onto a DIE.
22class DIEHash {
23public:
24  /// \brief Computes the ODR signature
25  uint64_t computeDIEODRSignature(DIE *Die);
26
27  // Helper routines to process parts of a DIE.
28 private:
29  /// \brief Adds the parent context of \param Die to the hash.
30  void addParentContext(DIE *Die);
31
32  // Routines that add DIEValues to the hash.
33private:
34  /// \brief Encodes and adds \param Value to the hash as a ULEB128.
35  void addULEB128(uint64_t Value);
36
37  /// \brief Adds \param Str to the hash and includes a NULL byte.
38  void addString(StringRef Str);
39
40private:
41  MD5 Hash;
42};
43}
44