1 //===-- scudo_utils.h -------------------------------------------*- 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 /// Header for scudo_utils.cpp. 11 /// 12 //===----------------------------------------------------------------------===// 13 14 #ifndef SCUDO_UTILS_H_ 15 #define SCUDO_UTILS_H_ 16 17 #include <string.h> 18 19 #include "sanitizer_common/sanitizer_common.h" 20 21 namespace __scudo { 22 23 template <class Dest, class Source> 24 inline Dest bit_cast(const Source& source) { 25 static_assert(sizeof(Dest) == sizeof(Source), "Sizes are not equal!"); 26 Dest dest; 27 memcpy(&dest, &source, sizeof(dest)); 28 return dest; 29 } 30 31 void dieWithMessage(const char *Format, ...); 32 33 enum CPUFeature { 34 SSE4_2 = 0, 35 ENUM_CPUFEATURE_MAX 36 }; 37 bool testCPUFeature(CPUFeature feature); 38 39 // Tiny PRNG based on https://en.wikipedia.org/wiki/Xorshift#xorshift.2B 40 // The state (128 bits) will be stored in thread local storage. 41 struct Xorshift128Plus { 42 public: 43 Xorshift128Plus(); 44 u64 Next() { 45 u64 x = State_0_; 46 const u64 y = State_1_; 47 State_0_ = y; 48 x ^= x << 23; 49 State_1_ = x ^ y ^ (x >> 17) ^ (y >> 26); 50 return State_1_ + y; 51 } 52 private: 53 u64 State_0_; 54 u64 State_1_; 55 }; 56 57 } // namespace __scudo 58 59 #endif // SCUDO_UTILS_H_ 60
