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// Copyright (C) 2015-2025 Jonathan Müller and foonathan/memory contributors
// SPDX-License-Identifier: Zlib
#include <foonathan/memory/detail/free_list.hpp>
#include <foonathan/memory/detail/small_free_list.hpp>
#include <algorithm>
#include <doctest/doctest.h>
#include <random>
#include <vector>
#include <foonathan/memory/detail/align.hpp>
#include <foonathan/memory/static_allocator.hpp>
using namespace foonathan::memory;
using namespace detail;
template <class FreeList>
void use_list_node(FreeList& list)
{
std::vector<void*> ptrs;
auto capacity = list.capacity();
// allocate and deallocate in reverse order
{
for (std::size_t i = 0u; i != capacity; ++i)
{
auto ptr = list.allocate();
REQUIRE(ptr);
REQUIRE(is_aligned(ptr, list.alignment()));
ptrs.push_back(ptr);
}
REQUIRE(list.capacity() == 0u);
REQUIRE(list.empty());
std::reverse(ptrs.begin(), ptrs.end());
for (auto p : ptrs)
list.deallocate(p);
REQUIRE(list.capacity() == capacity);
REQUIRE(!list.empty());
ptrs.clear();
}
// allocate and deallocate in same order
{
for (std::size_t i = 0u; i != capacity; ++i)
{
auto ptr = list.allocate();
REQUIRE(ptr);
REQUIRE(is_aligned(ptr, list.alignment()));
ptrs.push_back(ptr);
}
REQUIRE(list.capacity() == 0u);
REQUIRE(list.empty());
for (auto p : ptrs)
list.deallocate(p);
REQUIRE(list.capacity() == capacity);
REQUIRE(!list.empty());
ptrs.clear();
}
// allocate and deallocate in random order
{
for (std::size_t i = 0u; i != capacity; ++i)
{
auto ptr = list.allocate();
REQUIRE(ptr);
REQUIRE(is_aligned(ptr, list.alignment()));
ptrs.push_back(ptr);
}
REQUIRE(list.capacity() == 0u);
REQUIRE(list.empty());
std::shuffle(ptrs.begin(), ptrs.end(), std::mt19937{});
for (auto p : ptrs)
list.deallocate(p);
REQUIRE(list.capacity() == capacity);
REQUIRE(!list.empty());
ptrs.clear();
}
}
template <class FreeList>
void check_list(FreeList& list, void* memory, std::size_t size)
{
auto old_cap = list.capacity();
list.insert(memory, size);
REQUIRE(!list.empty());
REQUIRE(list.capacity() <= old_cap + size / list.node_size());
old_cap = list.capacity();
auto node = list.allocate();
REQUIRE(node);
REQUIRE(is_aligned(node, list.alignment()));
REQUIRE(list.capacity() == old_cap - 1);
list.deallocate(node);
REQUIRE(list.capacity() == old_cap);
use_list_node(list);
}
template <class FreeList>
void check_move(FreeList& list)
{
static_allocator_storage<1024> memory;
list.insert(&memory, 1024);
auto ptr = list.allocate();
REQUIRE(ptr);
REQUIRE(is_aligned(ptr, list.alignment()));
auto capacity = list.capacity();
auto list2 = detail::move(list);
REQUIRE(list.empty());
REQUIRE(list.capacity() == 0u);
REQUIRE(!list2.empty());
REQUIRE(list2.capacity() == capacity);
list2.deallocate(ptr);
static_allocator_storage<1024> memory2;
list.insert(&memory2, 1024);
REQUIRE(!list.empty());
REQUIRE(list.capacity() <= 1024 / list.node_size());
ptr = list.allocate();
REQUIRE(ptr);
REQUIRE(is_aligned(ptr, list.alignment()));
list.deallocate(ptr);
ptr = list2.allocate();
list = detail::move(list2);
REQUIRE(list2.empty());
REQUIRE(list2.capacity() == 0u);
REQUIRE(!list.empty());
REQUIRE(list.capacity() == capacity);
list.deallocate(ptr);
}
TEST_CASE("free_memory_list")
{
free_memory_list list(4);
REQUIRE(list.empty());
REQUIRE(list.node_size() >= 4);
REQUIRE(list.capacity() == 0u);
SUBCASE("normal insert")
{
static_allocator_storage<1024> memory;
check_list(list, &memory, 1024);
check_move(list);
}
SUBCASE("uneven insert")
{
static_allocator_storage<1023> memory; // not dividable
check_list(list, &memory, 1023);
check_move(list);
}
SUBCASE("multiple insert")
{
static_allocator_storage<1024> a;
static_allocator_storage<100> b;
static_allocator_storage<1337> c;
check_list(list, &a, 1024);
check_list(list, &b, 100);
check_list(list, &c, 1337);
check_move(list);
}
}
void use_list_array(ordered_free_memory_list& list)
{
std::vector<void*> ptrs;
auto capacity = list.capacity();
// We would need capacity / 3 nodes, but the memory might not be contiguous.
auto number_of_allocations = capacity / 6;
// allocate and deallocate in reverse order
{
for (std::size_t i = 0u; i != number_of_allocations; ++i)
{
auto ptr = list.allocate(3 * list.node_size());
REQUIRE(ptr);
REQUIRE(is_aligned(ptr, list.alignment()));
ptrs.push_back(ptr);
}
std::reverse(ptrs.begin(), ptrs.end());
for (auto p : ptrs)
list.deallocate(p, 3 * list.node_size());
REQUIRE(list.capacity() == capacity);
ptrs.clear();
}
// allocate and deallocate in same order
{
for (std::size_t i = 0u; i != number_of_allocations; ++i)
{
auto ptr = list.allocate(3 * list.node_size());
REQUIRE(ptr);
REQUIRE(is_aligned(ptr, list.alignment()));
ptrs.push_back(ptr);
}
for (auto p : ptrs)
list.deallocate(p, 3 * list.node_size());
REQUIRE(list.capacity() == capacity);
REQUIRE(!list.empty());
ptrs.clear();
}
// allocate and deallocate in random order
{
for (std::size_t i = 0u; i != number_of_allocations; ++i)
{
auto ptr = list.allocate(3 * list.node_size());
REQUIRE(ptr);
REQUIRE(is_aligned(ptr, list.alignment()));
ptrs.push_back(ptr);
}
std::shuffle(ptrs.begin(), ptrs.end(), std::mt19937{});
for (auto p : ptrs)
list.deallocate(p, 3 * list.node_size());
REQUIRE(list.capacity() == capacity);
REQUIRE(!list.empty());
ptrs.clear();
}
}
TEST_CASE("ordered_free_memory_list")
{
ordered_free_memory_list list(4);
REQUIRE(list.empty());
REQUIRE(list.node_size() >= 4);
REQUIRE(list.capacity() == 0u);
SUBCASE("normal insert")
{
static_allocator_storage<1024> memory;
check_list(list, &memory, 1024);
use_list_array(list);
check_move(list);
}
SUBCASE("uneven insert")
{
static_allocator_storage<1023> memory; // not dividable
check_list(list, &memory, 1023);
use_list_array(list);
check_move(list);
}
SUBCASE("multiple insert")
{
static_allocator_storage<1024> a;
static_allocator_storage<100> b;
static_allocator_storage<1337> c;
check_list(list, &a, 1024);
use_list_array(list);
check_list(list, &b, 100);
use_list_array(list);
check_list(list, &c, 1337);
use_list_array(list);
check_move(list);
}
}
TEST_CASE("small_free_memory_list")
{
small_free_memory_list list(4);
REQUIRE(list.empty());
REQUIRE(list.node_size() == 4);
REQUIRE(list.capacity() == 0u);
SUBCASE("normal insert")
{
static_allocator_storage<1024> memory;
check_list(list, &memory, 1024);
check_move(list);
}
SUBCASE("uneven insert")
{
static_allocator_storage<1023> memory; // not dividable
check_list(list, &memory, 1023);
check_move(list);
}
SUBCASE("big insert")
{
static_allocator_storage<4096> memory; // should use multiple chunks
check_list(list, &memory, 4096);
check_move(list);
}
SUBCASE("multiple insert")
{
static_allocator_storage<1024> a;
static_allocator_storage<100> b;
static_allocator_storage<1337> c;
check_list(list, &a, 1024);
check_list(list, &b, 100);
check_list(list, &c, 1337);
check_move(list);
}
}
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