c7fc73ee45
The testsuite utilities that use random numbers use a default-constructed mersenne_twister_engine, meaning the values are reproducable. This adds support for seeding them, controlledby an environment variable. Defining GLIBCXX_SEED_TEST_RNG=val in the environment will cause the engines to be seeded with atoi(val) if that is non-zero, or with a value read from std::random_device otherwise. Running with different seeds revealed some bugs in the tests, where a randomly selected iterator was past-the-end (which can't be erased), or where the randomly populated container was empty, and then we tried to remove elements from it unconditionally. libstdc++-v3/ChangeLog: * testsuite/util/exception/safety.h (setup_base::generate): Support seeding random engine. (erase_point, erase_range): Adjust range of random numbers to ensure dereferenceable iterators are used where required. (generation_prohibited::run): Do not try to erase from empty containers. * testsuite/util/testsuite_containergen.h (test_containers): Support seeding random engine.
112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
// Copyright (C) 2013-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#ifndef _GLIBCXX_TESTSUITE_CONTAINER_GEN_H
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#define _GLIBCXX_TESTSUITE_CONTAINER_GEN_H
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#include <testsuite_container_traits.h>
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#include <random>
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#include <cstdlib> // getenv, atoi
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#include <cstdio> // printf, fflush
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namespace __gnu_test
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{
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template<typename ContainerType, typename Tester, typename RandomGen>
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void
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test_single_container(Tester test, RandomGen& rg, int length, int domain)
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{
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std::vector<int> values;
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auto dist = std::uniform_int_distribution<>(0, domain - 1);
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for(int i = 0; i < length; ++i)
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values.push_back(dist(rg));
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ContainerType con(values.data(), values.data() + length);
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test(con, rg);
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}
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template<typename ContainerType, typename Tester, typename RandomGen>
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void
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test_special_containers(Tester test, RandomGen& rg, int length)
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{
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std::vector<int> values(length);
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ContainerType con(values.data(), values.data() + length);
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for(int i = 0; i < length; ++i)
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values[i] = 0;
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test(con, rg);
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for(int i = 0; i < length; ++i)
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values[i] = i;
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test(con, rg);
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for(int i = 0; i < length; ++i)
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values[i] = -i;
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test(con, rg);
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}
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template<typename ContainerType, typename Tester>
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void
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test_containers(Tester test)
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{
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std::mt19937_64 random_gen;
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if (const char* v = std::getenv("GLIBCXX_SEED_TEST_RNG"))
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{
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// A single seed value is much smaller than the mt19937 state size,
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// but we're not trying to be cryptographically secure here.
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int s = std::atoi(v);
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if (s == 0)
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s = (int)std::random_device{}();
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std::printf("Using random seed %d\n", s);
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std::fflush(stdout);
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random_gen.seed((unsigned)s);
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}
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#ifdef SIMULATOR_TEST
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int loops = 10;
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#else
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int loops = 1000;
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#endif
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for(int i = 0; i < loops; ++i)
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test_special_containers<ContainerType>(test, random_gen, i);
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for(int i = 1; i < 100; ++i)
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for(int j = 0; j < loops; ++j)
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test_single_container<ContainerType>(test, random_gen, i, i);
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for(int i = 0; i < loops; ++i)
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{
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test_single_container<ContainerType>(test, random_gen, 10, 10);
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test_single_container<ContainerType>(test, random_gen, 100, 10);
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test_single_container<ContainerType>(test, random_gen, 1000, 10);
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test_single_container<ContainerType>(test, random_gen, 10, 1000);
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}
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#ifndef SIMULATOR_TEST
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for(int i = 0; i < 1000; ++i)
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{
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test_single_container<ContainerType>(test, random_gen, 10000, 10);
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test_single_container<ContainerType>(test, random_gen, 10000, 10000);
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}
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#endif
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}
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} // namespace __gnu_test
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#endif
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