forked from OSchip/llvm-project
62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
//===-- scudo_utils.h -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// Header for scudo_utils.cpp.
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///
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//===----------------------------------------------------------------------===//
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#ifndef SCUDO_UTILS_H_
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#define SCUDO_UTILS_H_
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#include <string.h>
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#include "sanitizer_common/sanitizer_common.h"
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namespace __scudo {
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template <class Dest, class Source>
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inline Dest bit_cast(const Source& source) {
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static_assert(sizeof(Dest) == sizeof(Source), "Sizes are not equal!");
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Dest dest;
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memcpy(&dest, &source, sizeof(dest));
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return dest;
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}
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void NORETURN dieWithMessage(const char *Format, ...);
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enum CPUFeature {
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CRC32CPUFeature = 0,
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MaxCPUFeature,
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};
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bool testCPUFeature(CPUFeature feature);
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// Tiny PRNG based on https://en.wikipedia.org/wiki/Xorshift#xorshift.2B
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// The state (128 bits) will be stored in thread local storage.
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struct Xorshift128Plus {
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public:
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Xorshift128Plus();
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u64 Next() {
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u64 x = State[0];
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const u64 y = State[1];
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State[0] = y;
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x ^= x << 23;
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State[1] = x ^ y ^ (x >> 17) ^ (y >> 26);
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return State[1] + y;
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}
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private:
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u64 State[2];
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};
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// Software CRC32 functions, to be used when hardware support is not detected.
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u32 computeSoftwareCRC32(u32 Crc, uptr Data);
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} // namespace __scudo
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#endif // SCUDO_UTILS_H_
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