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unit-allocator.cpp
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263 lines (233 loc) · 7.16 KB
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// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT
#include "doctest_compatibility.h"
#define JSON_TESTS_PRIVATE
#include <nlohmann/json.hpp>
using nlohmann::json;
namespace
{
// special test case to check if memory is leaked if constructor throws
template<class T>
struct bad_allocator : std::allocator<T>
{
using std::allocator<T>::allocator;
bad_allocator() = default;
template<class U> bad_allocator(const bad_allocator<U>& /*unused*/) { }
template<class... Args>
void construct(T* /*unused*/, Args&& ... /*unused*/) // NOLINT(cppcoreguidelines-missing-std-forward)
{
throw std::bad_alloc();
}
template <class U>
struct rebind
{
using other = bad_allocator<U>;
};
};
} // namespace
TEST_CASE("bad_alloc")
{
SECTION("bad_alloc")
{
// create JSON type using the throwing allocator
using bad_json = nlohmann::basic_json<std::map,
std::vector,
std::string,
bool,
std::int64_t,
std::uint64_t,
double,
bad_allocator>;
// creating an object should throw
CHECK_THROWS_AS(bad_json(bad_json::value_t::object), std::bad_alloc&);
}
}
namespace
{
bool next_construct_fails = false;
bool next_destroy_fails = false;
bool next_deallocate_fails = false;
template<class T>
struct my_allocator : std::allocator<T>
{
using std::allocator<T>::allocator;
template<class... Args>
void construct(T* p, Args&& ... args)
{
if (next_construct_fails)
{
next_construct_fails = false;
throw std::bad_alloc();
}
::new (reinterpret_cast<void*>(p)) T(std::forward<Args>(args)...);
}
void deallocate(T* p, std::size_t n)
{
if (next_deallocate_fails)
{
next_deallocate_fails = false;
throw std::bad_alloc();
}
std::allocator<T>::deallocate(p, n);
}
void destroy(T* p)
{
if (next_destroy_fails)
{
next_destroy_fails = false;
throw std::bad_alloc();
}
static_cast<void>(p); // fix MSVC's C4100 warning
p->~T();
}
template <class U>
struct rebind
{
using other = my_allocator<U>;
};
};
// allows deletion of raw pointer, usually hold by json_value
template<class T>
void my_allocator_clean_up(T* p)
{
assert(p != nullptr);
my_allocator<T> alloc;
alloc.destroy(p);
alloc.deallocate(p, 1);
}
} // namespace
TEST_CASE("controlled bad_alloc")
{
// create JSON type using the throwing allocator
using my_json = nlohmann::basic_json<std::map,
std::vector,
std::string,
bool,
std::int64_t,
std::uint64_t,
double,
my_allocator>;
SECTION("class json_value")
{
SECTION("json_value(value_t)")
{
SECTION("object")
{
next_construct_fails = false;
auto t = my_json::value_t::object;
CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(t).object));
next_construct_fails = true;
CHECK_THROWS_AS(my_json::json_value(t), std::bad_alloc&);
next_construct_fails = false;
}
SECTION("array")
{
next_construct_fails = false;
auto t = my_json::value_t::array;
CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(t).array));
next_construct_fails = true;
CHECK_THROWS_AS(my_json::json_value(t), std::bad_alloc&);
next_construct_fails = false;
}
SECTION("string")
{
next_construct_fails = false;
auto t = my_json::value_t::string;
CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(t).string));
next_construct_fails = true;
CHECK_THROWS_AS(my_json::json_value(t), std::bad_alloc&);
next_construct_fails = false;
}
}
SECTION("json_value(const string_t&)")
{
next_construct_fails = false;
const my_json::string_t v("foo");
CHECK_NOTHROW(my_allocator_clean_up(my_json::json_value(v).string));
next_construct_fails = true;
CHECK_THROWS_AS(my_json::json_value(v), std::bad_alloc&);
next_construct_fails = false;
}
}
SECTION("class basic_json")
{
SECTION("basic_json(const CompatibleObjectType&)")
{
next_construct_fails = false;
const std::map<std::string, std::string> v {{"foo", "bar"}};
CHECK_NOTHROW(my_json(v));
next_construct_fails = true;
CHECK_THROWS_AS(my_json(v), std::bad_alloc&);
next_construct_fails = false;
}
SECTION("basic_json(const CompatibleArrayType&)")
{
next_construct_fails = false;
const std::vector<std::string> v {"foo", "bar", "baz"};
CHECK_NOTHROW(my_json(v));
next_construct_fails = true;
CHECK_THROWS_AS(my_json(v), std::bad_alloc&);
next_construct_fails = false;
}
SECTION("basic_json(const typename string_t::value_type*)")
{
next_construct_fails = false;
CHECK_NOTHROW(my_json("foo"));
next_construct_fails = true;
CHECK_THROWS_AS(my_json("foo"), std::bad_alloc&);
next_construct_fails = false;
}
SECTION("basic_json(const typename string_t::value_type*)")
{
next_construct_fails = false;
const std::string s("foo");
CHECK_NOTHROW(my_json(s));
next_construct_fails = true;
CHECK_THROWS_AS(my_json(s), std::bad_alloc&);
next_construct_fails = false;
}
}
}
namespace
{
template<class T>
struct allocator_no_forward : std::allocator<T>
{
allocator_no_forward() = default;
template <class U>
allocator_no_forward(allocator_no_forward<U> /*unused*/) {}
template <class U>
struct rebind
{
using other = allocator_no_forward<U>;
};
template <class... Args>
void construct(T* p, const Args& ... args) noexcept(noexcept(::new (static_cast<void*>(p)) T(args...)))
{
// force copy even if move is available
::new (static_cast<void*>(p)) T(args...);
}
};
} // namespace
TEST_CASE("bad my_allocator::construct")
{
SECTION("my_allocator::construct doesn't forward")
{
using bad_alloc_json = nlohmann::basic_json<std::map,
std::vector,
std::string,
bool,
std::int64_t,
std::uint64_t,
double,
allocator_no_forward>;
bad_alloc_json j;
j["test"] = bad_alloc_json::array_t();
j["test"].push_back("should not leak");
}
}