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_LIB_PROFILEDATA_INSTRPROFINDEXED_H
15 #define LLVM_LIB_PROFILEDATA_INSTRPROFINDEXED_H
16 
17 #include "llvm/Support/Endian.h"
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Support/MD5.h"
20 
21 namespace llvm {
22 
23 namespace IndexedInstrProf {
24 enum class HashT : uint32_t {
25   MD5,
26 
27   Last = MD5
28 };
29 
MD5Hash(StringRef Str)30 static inline uint64_t MD5Hash(StringRef Str) {
31   MD5 Hash;
32   Hash.update(Str);
33   llvm::MD5::MD5Result Result;
34   Hash.final(Result);
35   // Return the least significant 8 bytes. Our MD5 implementation returns the
36   // result in little endian, so we may need to swap bytes.
37   using namespace llvm::support;
38   return endian::read<uint64_t, little, unaligned>(Result);
39 }
40 
ComputeHash(HashT Type,StringRef K)41 static inline uint64_t ComputeHash(HashT Type, StringRef K) {
42   switch (Type) {
43   case HashT::MD5:
44     return IndexedInstrProf::MD5Hash(K);
45   }
46   llvm_unreachable("Unhandled hash type");
47 }
48 
49 const uint64_t Magic = 0x8169666f72706cff; // "\xfflprofi\x81"
50 const uint64_t Version = 2;
51 const HashT HashType = HashT::MD5;
52 }
53 
54 } // end namespace llvm
55 
56 #endif
57