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Reorganize directories (#3462)
* 🚚 move files * 🚚 rename doc folder to docs * 🚚 rename test folder to tests
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Niels Lohmann
GitHub
275
tests/src/unit-allocator.cpp
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275
tests/src/unit-allocator.cpp
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/*
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__ _____ _____ _____
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__| | __| | | | JSON for Modern C++ (test suite)
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| | |__ | | | | | | version 3.10.5
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|_____|_____|_____|_|___| https://github.com/nlohmann/json
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Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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SPDX-License-Identifier: MIT
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Copyright (c) 2013-2022 Niels Lohmann <http://nlohmann.me>.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include "doctest_compatibility.h"
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#define JSON_TESTS_PRIVATE
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#include <nlohmann/json.hpp>
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using nlohmann::json;
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namespace
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{
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// special test case to check if memory is leaked if constructor throws
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template<class T>
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struct bad_allocator : std::allocator<T>
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{
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using std::allocator<T>::allocator;
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template<class... Args>
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void construct(T* /*unused*/, Args&& ... /*unused*/)
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{
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throw std::bad_alloc();
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}
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};
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} // namespace
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TEST_CASE("bad_alloc")
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{
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SECTION("bad_alloc")
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{
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// create JSON type using the throwing allocator
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using bad_json = nlohmann::basic_json<std::map,
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std::vector,
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std::string,
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bool,
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std::int64_t,
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std::uint64_t,
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double,
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bad_allocator>;
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// creating an object should throw
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CHECK_THROWS_AS(bad_json(bad_json::value_t::object), std::bad_alloc&);
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}
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}
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namespace
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{
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bool next_construct_fails = false;
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bool next_destroy_fails = false;
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bool next_deallocate_fails = false;
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template<class T>
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struct my_allocator : std::allocator<T>
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{
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using std::allocator<T>::allocator;
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template<class... Args>
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void construct(T* p, Args&& ... args)
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{
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if (next_construct_fails)
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{
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next_construct_fails = false;
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throw std::bad_alloc();
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}
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::new (reinterpret_cast<void*>(p)) T(std::forward<Args>(args)...);
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}
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void deallocate(T* p, std::size_t n)
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{
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if (next_deallocate_fails)
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{
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next_deallocate_fails = false;
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throw std::bad_alloc();
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}
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std::allocator<T>::deallocate(p, n);
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}
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void destroy(T* p)
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{
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if (next_destroy_fails)
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{
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next_destroy_fails = false;
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throw std::bad_alloc();
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}
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static_cast<void>(p); // fix MSVC's C4100 warning
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p->~T();
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}
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template <class U>
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struct rebind
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{
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using other = my_allocator<U>;
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};
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};
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// allows deletion of raw pointer, usually hold by json_value
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template<class T>
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void my_allocator_clean_up(T* p)
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{
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assert(p != nullptr);
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my_allocator<T> alloc;
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alloc.destroy(p);
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alloc.deallocate(p, 1);
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}
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} // namespace
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TEST_CASE("controlled bad_alloc")
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{
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// create JSON type using the throwing allocator
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using my_json = nlohmann::basic_json<std::map,
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std::vector,
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std::string,
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bool,
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std::int64_t,
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std::uint64_t,
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double,
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my_allocator>;
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SECTION("class json_value")
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{
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SECTION("json_value(value_t)")
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{
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SECTION("object")
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{
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next_construct_fails = false;
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auto t = my_json::value_t::object;
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CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(t).object));
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next_construct_fails = true;
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CHECK_THROWS_AS(my_json::json_value(t), std::bad_alloc&);
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next_construct_fails = false;
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}
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SECTION("array")
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{
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next_construct_fails = false;
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auto t = my_json::value_t::array;
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CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(t).array));
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next_construct_fails = true;
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CHECK_THROWS_AS(my_json::json_value(t), std::bad_alloc&);
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next_construct_fails = false;
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}
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SECTION("string")
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{
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next_construct_fails = false;
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auto t = my_json::value_t::string;
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CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(t).string));
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next_construct_fails = true;
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CHECK_THROWS_AS(my_json::json_value(t), std::bad_alloc&);
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next_construct_fails = false;
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}
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}
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SECTION("json_value(const string_t&)")
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{
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next_construct_fails = false;
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my_json::string_t v("foo");
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CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(v).string));
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next_construct_fails = true;
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CHECK_THROWS_AS(my_json::json_value(v), std::bad_alloc&);
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next_construct_fails = false;
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}
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}
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SECTION("class basic_json")
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{
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SECTION("basic_json(const CompatibleObjectType&)")
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{
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next_construct_fails = false;
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std::map<std::string, std::string> v {{"foo", "bar"}};
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CHECK_NOTHROW(my_json(v));
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next_construct_fails = true;
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CHECK_THROWS_AS(my_json(v), std::bad_alloc&);
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next_construct_fails = false;
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}
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SECTION("basic_json(const CompatibleArrayType&)")
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{
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next_construct_fails = false;
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std::vector<std::string> v {"foo", "bar", "baz"};
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CHECK_NOTHROW(my_json(v));
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next_construct_fails = true;
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CHECK_THROWS_AS(my_json(v), std::bad_alloc&);
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next_construct_fails = false;
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}
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SECTION("basic_json(const typename string_t::value_type*)")
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{
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next_construct_fails = false;
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CHECK_NOTHROW(my_json("foo"));
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next_construct_fails = true;
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CHECK_THROWS_AS(my_json("foo"), std::bad_alloc&);
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next_construct_fails = false;
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}
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SECTION("basic_json(const typename string_t::value_type*)")
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{
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next_construct_fails = false;
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std::string s("foo");
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CHECK_NOTHROW(my_json(s));
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next_construct_fails = true;
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CHECK_THROWS_AS(my_json(s), std::bad_alloc&);
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next_construct_fails = false;
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}
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}
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}
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namespace
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{
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template<class T>
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struct allocator_no_forward : std::allocator<T>
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{
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allocator_no_forward() = default;
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template <class U>
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allocator_no_forward(allocator_no_forward<U> /*unused*/) {}
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template <class U>
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struct rebind
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{
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using other = allocator_no_forward<U>;
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};
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template <class... Args>
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void construct(T* p, const Args& ... args) noexcept(noexcept(::new (static_cast<void*>(p)) T(args...)))
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{
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// force copy even if move is available
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::new (static_cast<void*>(p)) T(args...);
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}
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};
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} // namespace
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TEST_CASE("bad my_allocator::construct")
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{
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SECTION("my_allocator::construct doesn't forward")
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{
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using bad_alloc_json = nlohmann::basic_json<std::map,
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std::vector,
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std::string,
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bool,
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std::int64_t,
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std::uint64_t,
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double,
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allocator_no_forward>;
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bad_alloc_json j;
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j["test"] = bad_alloc_json::array_t();
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j["test"].push_back("should not leak");
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}
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}
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