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 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 = 1; 50 const HashT HashType = HashT::MD5; 51 } 52 53 } // end namespace llvm 54 55 #endif // LLVM_PROFILEDATA_INSTRPROF_INDEXED_H_ 56
