1 // Copyright (c) 2019 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "source/fuzz/pseudo_random_generator.h"
16
17 #include <cassert>
18
19 namespace spvtools {
20 namespace fuzz {
21
PseudoRandomGenerator(uint32_t seed)22 PseudoRandomGenerator::PseudoRandomGenerator(uint32_t seed) : mt_(seed) {}
23
24 PseudoRandomGenerator::~PseudoRandomGenerator() = default;
25
RandomUint32(uint32_t bound)26 uint32_t PseudoRandomGenerator::RandomUint32(uint32_t bound) {
27 assert(bound > 0 && "Bound must be positive");
28 return std::uniform_int_distribution<uint32_t>(0, bound - 1)(mt_);
29 }
30
RandomUint64(uint64_t bound)31 uint64_t PseudoRandomGenerator::RandomUint64(uint64_t bound) {
32 assert(bound > 0 && "Bound must be positive");
33 return std::uniform_int_distribution<uint64_t>(0, bound - 1)(mt_);
34 }
35
RandomBool()36 bool PseudoRandomGenerator::RandomBool() {
37 return static_cast<bool>(std::uniform_int_distribution<>(0, 1)(mt_));
38 }
39
RandomPercentage()40 uint32_t PseudoRandomGenerator::RandomPercentage() {
41 // We use 101 because we want a result in the closed interval [0, 100], and
42 // RandomUint32 is not inclusive of its bound.
43 return RandomUint32(101);
44 }
45
RandomDouble()46 double PseudoRandomGenerator::RandomDouble() {
47 return std::uniform_real_distribution<double>(0.0, 1.0)(mt_);
48 }
49
50 } // namespace fuzz
51 } // namespace spvtools
52