src/llvm/lib/ProfileData/InstrProfIndexed.h

   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/ErrorHandling.h"
  18 #include "llvm/Support/MD5.h"
  19
  20 namespace llvm {
  21
  22 namespace IndexedInstrProf {
  23 enum class HashT : uint32_t {
  24   MD5,
  25
  26   Last = MD5
  27 };
  28
  29 static 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
  40 static 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
  48 const uint64_t Magic = 0x8169666f72706cff; // "\xfflprofi\x81"
  49 const uint64_t Version = 2;
  50 const HashT HashType = HashT::MD5;
  51 }
  52
  53 } // end namespace llvm
  54
  55 #endif