48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
//===- FuzzerRandom.h - Internal header for the Fuzzer ----------*- C++ -* ===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// fuzzer::Random
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_FUZZER_RANDOM_H
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#define LLVM_FUZZER_RANDOM_H
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#include <random>
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namespace fuzzer {
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class Random : public std::minstd_rand {
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public:
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Random(unsigned int seed) : std::minstd_rand(seed) {}
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result_type operator()() { return this->std::minstd_rand::operator()(); }
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template <typename T>
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typename std::enable_if<std::is_integral<T>::value, T>::type Rand() {
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return static_cast<T>(this->operator()());
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}
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size_t RandBool() { return this->operator()() % 2; }
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size_t SkewTowardsLast(size_t n) {
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size_t T = this->operator()(n * n);
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size_t Res = static_cast<size_t>(sqrt(T));
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return Res;
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}
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template <typename T>
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typename std::enable_if<std::is_integral<T>::value, T>::type operator()(T n) {
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return n ? Rand<T>() % n : 0;
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}
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template <typename T>
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typename std::enable_if<std::is_integral<T>::value, T>::type
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operator()(T From, T To) {
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assert(From < To);
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auto RangeSize = static_cast<unsigned long long>(To) -
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static_cast<unsigned long long>(From) + 1;
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return static_cast<T>(this->operator()(RangeSize) + From);
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}
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};
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} // namespace fuzzer
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#endif // LLVM_FUZZER_RANDOM_H
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