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//===-- scudo_utils.h -------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// Header for scudo_utils.cpp.
///
//===----------------------------------------------------------------------===//
#ifndef SCUDO_UTILS_H_
#define SCUDO_UTILS_H_
#include <string.h>
#include "sanitizer_common/sanitizer_common.h"
namespace __scudo {
template <class Dest, class Source>
inline Dest bit_cast(const Source& source) {
static_assert(sizeof(Dest) == sizeof(Source), "Sizes are not equal!");
Dest dest;
memcpy(&dest, &source, sizeof(dest));
return dest;
}
void dieWithMessage(const char *Format, ...);
enum CPUFeature {
SSE4_2 = 0,
ENUM_CPUFEATURE_MAX
};
bool testCPUFeature(CPUFeature feature);
// Tiny PRNG based on https://en.wikipedia.org/wiki/Xorshift#xorshift.2B
// The state (128 bits) will be stored in thread local storage.
struct Xorshift128Plus {
public:
Xorshift128Plus();
u64 Next() {
u64 x = State_0_;
const u64 y = State_1_;
State_0_ = y;
x ^= x << 23;
State_1_ = x ^ y ^ (x >> 17) ^ (y >> 26);
return State_1_ + y;
}
private:
u64 State_0_;
u64 State_1_;
};
} // namespace __scudo
#endif // SCUDO_UTILS_H_
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