mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
// Copyright (c) 2021 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef TEST_FUZZERS_RANDOM_GENERATOR_H_
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#define TEST_FUZZERS_RANDOM_GENERATOR_H_
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#include <cstdint>
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#include <random>
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#include "source/spirv_target_env.h"
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namespace spvtools {
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namespace fuzzers {
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/// Pseudo random generator utility class for fuzzing
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class RandomGenerator {
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public:
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/// @brief Initializes the internal engine
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/// @param seed - seed value passed to engine
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explicit RandomGenerator(uint64_t seed);
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/// @brief Initializes the internal engine
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/// @param data - data to calculate the seed from
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/// @param size - size of the data
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explicit RandomGenerator(const uint8_t* data, size_t size);
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~RandomGenerator() {}
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/// Calculate a seed value based on a blob of data.
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/// Currently hashes bytes near the front of the buffer, after skipping N
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/// bytes.
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/// @param data - pointer to data to base calculation off of, must be !nullptr
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/// @param size - number of elements in |data|, must be > 0
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static uint64_t CalculateSeed(const uint8_t* data, size_t size);
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/// Get random valid target env.
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spv_target_env GetTargetEnv();
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/// Get uint32_t value from uniform distribution.
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/// @param lower - lower bound of integer generated
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/// @param upper - upper bound of integer generated
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/// @returns i, where lower <= i < upper
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uint32_t GetUInt32(uint32_t lower, uint32_t upper);
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/// Get uint32_t value from uniform distribution.
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/// @param bound - Upper bound of integer generated
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/// @returns i, where 0 <= i < bound
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uint32_t GetUInt32(uint32_t bound);
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private:
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std::mt19937_64 engine_;
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}; // class RandomGenerator
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} // namespace fuzzers
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} // namespace spvtools
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#endif // TEST_FUZZERS_RANDOM_GENERATOR_UTILS_H_
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