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