1 //===- FuzzerRandom.h - Internal header for the Fuzzer ----------*- C++ -* ===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 // fuzzer::Random
10 //===----------------------------------------------------------------------===//
11 
12 #ifndef LLVM_FUZZER_RANDOM_H
13 #define LLVM_FUZZER_RANDOM_H
14 
15 #include <random>
16 
17 namespace fuzzer {
18 class Random : public std::mt19937 {
19  public:
Random(unsigned int seed)20   Random(unsigned int seed) : std::mt19937(seed) {}
operator()21   result_type operator()() { return this->std::mt19937::operator()(); }
Rand()22   size_t Rand() { return this->operator()(); }
RandBool()23   size_t RandBool() { return Rand() % 2; }
operator()24   size_t operator()(size_t n) { return n ? Rand() % n : 0; }
operator()25   intptr_t operator()(intptr_t From, intptr_t To) {
26     assert(From < To);
27     intptr_t RangeSize = To - From + 1;
28     return operator()(RangeSize) + From;
29   }
30 };
31 
32 }  // namespace fuzzer
33 
34 #endif  // LLVM_FUZZER_RANDOM_H
35