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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 NORETURN dieWithMessage(const char *Format, ...);
enum CPUFeature {
CRC32CPUFeature = 0,
MaxCPUFeature,
};
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[2];
};
// Software CRC32 functions, to be used when hardware support is not detected.
u32 computeSoftwareCRC32(u32 Crc, uptr Data);
} // namespace __scudo
#endif // SCUDO_UTILS_H_
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