You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
1.4 KiB
60 lines
1.4 KiB
7 months ago
|
//===-- 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_
|