InstrProfIndexed.h revision dce4a407a24b04eebc6a376f8e62b41aaa7b071f 
1//=-- InstrProfIndexed.h - Indexed profiling format support -------*- 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// Shared header for the instrumented profile data reader and writer.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_PROFILEDATA_INSTRPROF_INDEXED_H_
15#define LLVM_PROFILEDATA_INSTRPROF_INDEXED_H_
16
17#include "llvm/Support/ErrorHandling.h"
18#include "llvm/Support/MD5.h"
19
20namespace llvm {
21
22namespace IndexedInstrProf {
23enum class HashT : uint32_t {
24  MD5,
25
26  Last = MD5
27};
28
29static inline uint64_t MD5Hash(StringRef Str) {
30  MD5 Hash;
31  Hash.update(Str);
32  llvm::MD5::MD5Result Result;
33  Hash.final(Result);
34  // Return the least significant 8 bytes. Our MD5 implementation returns the
35  // result in little endian, so we may need to swap bytes.
36  using namespace llvm::support;
37  return endian::read<uint64_t, little, unaligned>(Result);
38}
39
40static inline uint64_t ComputeHash(HashT Type, StringRef K) {
41  switch (Type) {
42  case HashT::MD5:
43    return IndexedInstrProf::MD5Hash(K);
44  }
45  llvm_unreachable("Unhandled hash type");
46}
47
48const uint64_t Magic = 0x8169666f72706cff; // "\xfflprofi\x81"
49const uint64_t Version = 1;
50const HashT HashType = HashT::MD5;
51}
52
53} // end namespace llvm
54
55#endif // LLVM_PROFILEDATA_INSTRPROF_INDEXED_H_
56