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
21namespace __scudo {
22
23template <class Dest, class Source>
24inline 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
31void dieWithMessage(const char *Format, ...);
32
33enum  CPUFeature {
34  SSE4_2 = 0,
35  ENUM_CPUFEATURE_MAX
36};
37bool 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.
41struct 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