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ladybird/Tests/AK/TestBitmap.cpp
Andreas Kling cc4b3cbacc
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/*
* Copyright (c) 2020, Andreas Kling <andreas@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <AK/Bitmap.h>
using namespace Test::Randomized;
TEST_CASE(construct_empty)
{
Bitmap bitmap;
EXPECT_EQ(bitmap.size(), 0u);
}
TEST_CASE(find_first_set)
{
auto bitmap = MUST(Bitmap::create(128, false));
bitmap.set(69, true);
EXPECT_EQ(bitmap.find_first_set().value(), 69u);
}
TEST_CASE(find_first_unset)
{
auto bitmap = MUST(Bitmap::create(128, true));
bitmap.set(51, false);
EXPECT_EQ(bitmap.find_first_unset().value(), 51u);
}
TEST_CASE(find_one_anywhere_set)
{
{
auto bitmap = MUST(Bitmap::create(168, false));
bitmap.set(34, true);
bitmap.set(97, true);
EXPECT_EQ(bitmap.find_one_anywhere_set(0).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(31).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(32).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(34).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(36).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(63).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(64).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(96).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(96).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(97).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(127).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(128).value(), 34u);
}
{
auto bitmap = MUST(Bitmap::create(128 + 24, false));
bitmap.set(34, true);
bitmap.set(126, true);
EXPECT_EQ(bitmap.find_one_anywhere_set(0).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(63).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(64).value(), 126u);
}
{
auto bitmap = MUST(Bitmap::create(32, false));
bitmap.set(12, true);
bitmap.set(24, true);
auto got = bitmap.find_one_anywhere_set(0).value();
EXPECT(got == 12 || got == 24);
}
}
TEST_CASE(find_one_anywhere_unset)
{
{
auto bitmap = MUST(Bitmap::create(168, true));
bitmap.set(34, false);
bitmap.set(97, false);
EXPECT_EQ(bitmap.find_one_anywhere_unset(0).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(31).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(32).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(34).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(36).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(63).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(64).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(96).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(96).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(97).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(127).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(128).value(), 34u);
}
{
auto bitmap = MUST(Bitmap::create(128 + 24, true));
bitmap.set(34, false);
bitmap.set(126, false);
EXPECT_EQ(bitmap.find_one_anywhere_unset(0).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(63).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(64).value(), 126u);
}
{
auto bitmap = MUST(Bitmap::create(32, true));
bitmap.set(12, false);
bitmap.set(24, false);
auto got = bitmap.find_one_anywhere_unset(0).value();
EXPECT(got == 12 || got == 24);
}
}
TEST_CASE(find_first_range)
{
auto bitmap = MUST(Bitmap::create(128, true));
bitmap.set(47, false);
bitmap.set(48, false);
bitmap.set(49, false);
bitmap.set(50, false);
bitmap.set(51, false);
size_t found_range_size = 0;
auto result = bitmap.find_longest_range_of_unset_bits(5, found_range_size);
EXPECT_EQ(result.has_value(), true);
EXPECT_EQ(found_range_size, 5u);
EXPECT_EQ(result.value(), 47u);
}
TEST_CASE(set_range)
{
{
auto bitmap = MUST(Bitmap::create(128, false));
bitmap.set_range(41, 10, true);
EXPECT_EQ(bitmap.get(40), false);
EXPECT_EQ(bitmap.get(41), true);
EXPECT_EQ(bitmap.get(42), true);
EXPECT_EQ(bitmap.get(43), true);
EXPECT_EQ(bitmap.get(44), true);
EXPECT_EQ(bitmap.get(45), true);
EXPECT_EQ(bitmap.get(46), true);
EXPECT_EQ(bitmap.get(47), true);
EXPECT_EQ(bitmap.get(48), true);
EXPECT_EQ(bitmap.get(49), true);
EXPECT_EQ(bitmap.get(50), true);
EXPECT_EQ(bitmap.get(51), false);
}
{
auto bitmap = MUST(Bitmap::create(288, false));
bitmap.set_range(48, 32, true);
bitmap.set_range(94, 39, true);
bitmap.set_range(190, 71, true);
bitmap.set_range(190 + 71 - 7, 21, false); // slightly overlapping clear
for (size_t i = 0; i < bitmap.size(); i++) {
bool should_be_set = (i >= 48 && i < 48 + 32)
|| (i >= 94 && i < 94 + 39)
|| ((i >= 190 && i < 190 + 71) && !(i >= 190 + 71 - 7 && i < 190 + 71 - 7 + 21));
EXPECT_EQ(bitmap.get(i), should_be_set);
}
EXPECT_EQ(bitmap.count_slow(true), 32u + 39u + 71u - 7u);
}
}
TEST_CASE(find_first_fit)
{
{
auto bitmap = MUST(Bitmap::create(32, true));
auto fit = bitmap.find_first_fit(1);
EXPECT_EQ(fit.has_value(), false);
}
{
auto bitmap = MUST(Bitmap::create(32, true));
bitmap.set(31, false);
auto fit = bitmap.find_first_fit(1);
EXPECT_EQ(fit.has_value(), true);
EXPECT_EQ(fit.value(), 31u);
}
for (size_t i = 0; i < 128; ++i) {
auto bitmap = MUST(Bitmap::create(128, true));
bitmap.set(i, false);
auto fit = bitmap.find_first_fit(1);
EXPECT_EQ(fit.has_value(), true);
EXPECT_EQ(fit.value(), i);
}
for (size_t i = 0; i < 127; ++i) {
auto bitmap = MUST(Bitmap::create(128, true));
bitmap.set(i, false);
bitmap.set(i + 1, false);
auto fit = bitmap.find_first_fit(2);
EXPECT_EQ(fit.has_value(), true);
EXPECT_EQ(fit.value(), i);
}
size_t bitmap_size = 1024;
for (size_t chunk_size = 1; chunk_size < 64; ++chunk_size) {
for (size_t i = 0; i < bitmap_size - chunk_size; ++i) {
auto bitmap = MUST(Bitmap::create(bitmap_size, true));
for (size_t c = 0; c < chunk_size; ++c)
bitmap.set(i + c, false);
auto fit = bitmap.find_first_fit(chunk_size);
EXPECT_EQ(fit.has_value(), true);
EXPECT_EQ(fit.value(), i);
}
}
}
TEST_CASE(find_longest_range_of_unset_bits_edge)
{
auto bitmap = MUST(Bitmap::create(36, true));
bitmap.set_range(32, 4, false);
size_t found_range_size = 0;
auto result = bitmap.find_longest_range_of_unset_bits(1, found_range_size);
EXPECT_EQ(result.has_value(), true);
EXPECT_EQ(result.value(), 32u);
}
TEST_CASE(count_in_range)
{
auto bitmap = MUST(Bitmap::create(256, false));
bitmap.set(14, true);
bitmap.set(17, true);
bitmap.set(19, true);
bitmap.set(20, true);
for (size_t i = 34; i < 250; i++) {
if (i < 130 || i > 183)
bitmap.set(i, true);
}
auto count_bits_slow = [](Bitmap const& b, size_t start, size_t len, bool value) -> size_t {
size_t count = 0;
for (size_t i = start; i < start + len; i++) {
if (b.get(i) == value)
count++;
}
return count;
};
auto test_with_value = [&](bool value) {
auto do_test = [&](size_t start, size_t len) {
EXPECT_EQ(bitmap.count_in_range(start, len, value), count_bits_slow(bitmap, start, len, value));
};
do_test(16, 2);
do_test(16, 3);
do_test(16, 4);
for (size_t start = 8; start < 24; start++) {
for (size_t end = 9; end < 25; end++) {
if (start >= end)
continue;
do_test(start, end - start);
}
}
for (size_t start = 1; start <= 9; start++) {
for (size_t i = start + 1; i < bitmap.size() - start + 1; i++)
do_test(start, i - start);
}
};
test_with_value(true);
test_with_value(false);
}
TEST_CASE(byte_aligned_access)
{
{
auto bitmap = MUST(Bitmap::create(16, true));
EXPECT_EQ(bitmap.count_in_range(0, 16, true), 16u);
EXPECT_EQ(bitmap.count_in_range(8, 8, true), 8u);
EXPECT_EQ(bitmap.count_in_range(0, 8, true), 8u);
EXPECT_EQ(bitmap.count_in_range(4, 8, true), 8u);
}
{
auto bitmap = MUST(Bitmap::create(16, false));
bitmap.set_range(4, 8, true);
EXPECT_EQ(bitmap.count_in_range(0, 16, true), 8u);
EXPECT_EQ(bitmap.count_in_range(8, 8, true), 4u);
EXPECT_EQ(bitmap.count_in_range(0, 8, true), 4u);
EXPECT_EQ(bitmap.count_in_range(4, 8, true), 8u);
}
{
auto bitmap = MUST(Bitmap::create(8, false));
bitmap.set(2, true);
bitmap.set(4, true);
EXPECT_EQ(bitmap.count_in_range(0, 2, true), 0u);
EXPECT_EQ(bitmap.count_in_range(0, 4, true), 1u);
EXPECT_EQ(bitmap.count_in_range(0, 8, true), 2u);
EXPECT_EQ(bitmap.count_in_range(4, 4, true), 1u);
}
}
RANDOMIZED_TEST_CASE(set_get)
{
GEN(init, Gen::boolean());
GEN(new_value, Gen::boolean());
GEN(size, Gen::number_u64(1, 64));
GEN(i, Gen::number_u64(size - 1));
auto bitmap = MUST(Bitmap::create(size, init));
bitmap.set(i, new_value);
EXPECT_EQ(bitmap.get(i), new_value);
}
RANDOMIZED_TEST_CASE(set_range)
{
GEN(init, Gen::boolean());
GEN(size, Gen::number_u64(1, 64));
GEN(new_value, Gen::boolean());
GEN(start, Gen::number_u64(size - 1));
GEN(len, Gen::number_u64(size - start - 1));
auto bitmap = MUST(Bitmap::create(size, init));
bitmap.set_range(start, len, new_value);
for (size_t i = start; i < start + len; ++i)
EXPECT_EQ(bitmap.get(i), new_value);
EXPECT_EQ(bitmap.count_in_range(start, len, new_value), len);
}
RANDOMIZED_TEST_CASE(fill)
{
GEN(init, Gen::boolean());
GEN(size, Gen::number_u64(1, 64));
GEN(new_value, Gen::boolean());
auto bitmap = MUST(Bitmap::create(size, init));
bitmap.fill(new_value);
EXPECT_EQ(bitmap.count_slow(new_value), size);
}
TEST_CASE(find_one_anywhere_edge_case)
{
{
auto bitmap = MUST(Bitmap::create(1, false));
bitmap.set(0, false);
EXPECT_EQ(bitmap.find_one_anywhere_unset(0).value(), 0UL);
}
}
RANDOMIZED_TEST_CASE(find_one_anywhere)
{
GEN(init, Gen::boolean());
GEN(size, Gen::number_u64(1, 64));
GEN(hint, Gen::number_u64(size - 1));
GEN(new_value, Gen::boolean());
GEN(i, Gen::number_u64(size - 1));
auto bitmap = MUST(Bitmap::create(size, init));
bitmap.set(i, new_value);
Optional<size_t> result = new_value
? bitmap.find_one_anywhere_set(hint)
: bitmap.find_one_anywhere_unset(hint);
auto expected_found_index = init == new_value ? 0 : i;
EXPECT_EQ(result.value(), expected_found_index);
}
TEST_CASE(find_first_edge_case)
{
{
auto bitmap = MUST(Bitmap::create(1, false));
bitmap.set(0, false);
EXPECT_EQ(bitmap.find_first_unset().value(), 0UL);
}
}
RANDOMIZED_TEST_CASE(find_first)
{
GEN(init, Gen::boolean());
GEN(size, Gen::number_u64(1, 64));
GEN(new_value, Gen::boolean());
GEN(i, Gen::number_u64(size - 1));
auto bitmap = MUST(Bitmap::create(size, init));
bitmap.set(i, new_value);
Optional<size_t> result = new_value
? bitmap.find_first_set()
: bitmap.find_first_unset();
auto expected_found_index = init == new_value ? 0 : i;
EXPECT_EQ(result.value(), expected_found_index);
}
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