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bf7b77e252
When we switched the Bitmap code to operating 32 bits at a time, we neglected to look in the trailing remainder bits after the last full 32-bit word. This patch fixes that and adds a couple of tests for Bitmap that I hacked up while tracking down this bug. I found this bug when noticing that the kernel would OOM while there were still some pages left in the physical page allocator.
140 lines
4.3 KiB
C++
140 lines
4.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/TestSuite.h>
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#include <AK/Bitmap.h>
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TEST_CASE(construct_empty)
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{
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Bitmap bitmap;
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EXPECT_EQ(bitmap.size(), 0u);
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}
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TEST_CASE(find_first_set)
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{
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Bitmap bitmap(128, false);
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bitmap.set(69, true);
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EXPECT_EQ(bitmap.find_first_set().value(), 69u);
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}
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TEST_CASE(find_first_unset)
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{
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Bitmap bitmap(128, true);
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bitmap.set(51, false);
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EXPECT_EQ(bitmap.find_first_unset().value(), 51u);
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}
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TEST_CASE(find_first_range)
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{
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Bitmap bitmap(128, true);
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bitmap.set(47, false);
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bitmap.set(48, false);
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bitmap.set(49, false);
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bitmap.set(50, false);
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bitmap.set(51, false);
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size_t found_range_size = 0;
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auto result = bitmap.find_longest_range_of_unset_bits(5, found_range_size);
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EXPECT_EQ(result.has_value(), true);
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EXPECT_EQ(found_range_size, 5u);
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EXPECT_EQ(result.value(), 47u);
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}
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TEST_CASE(set_range)
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{
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Bitmap bitmap(128, false);
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bitmap.set_range(41, 10, true);
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EXPECT_EQ(bitmap.get(40), false);
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EXPECT_EQ(bitmap.get(41), true);
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EXPECT_EQ(bitmap.get(42), true);
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EXPECT_EQ(bitmap.get(43), true);
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EXPECT_EQ(bitmap.get(44), true);
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EXPECT_EQ(bitmap.get(45), true);
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EXPECT_EQ(bitmap.get(46), true);
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EXPECT_EQ(bitmap.get(47), true);
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EXPECT_EQ(bitmap.get(48), true);
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EXPECT_EQ(bitmap.get(49), true);
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EXPECT_EQ(bitmap.get(50), true);
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EXPECT_EQ(bitmap.get(51), false);
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}
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TEST_CASE(find_first_fit)
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{
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{
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Bitmap bitmap(32, true);
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auto fit = bitmap.find_first_fit(1);
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EXPECT_EQ(fit.has_value(), false);
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}
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{
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Bitmap bitmap(32, true);
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bitmap.set(31, false);
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auto fit = bitmap.find_first_fit(1);
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EXPECT_EQ(fit.has_value(), true);
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EXPECT_EQ(fit.value(), 31u);
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}
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for (size_t i = 0; i < 128; ++i) {
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Bitmap bitmap(128, true);
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bitmap.set(i, false);
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auto fit = bitmap.find_first_fit(1);
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EXPECT_EQ(fit.has_value(), true);
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EXPECT_EQ(fit.value(), i);
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}
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for (size_t i = 0; i < 127; ++i) {
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Bitmap bitmap(128, true);
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bitmap.set(i, false);
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bitmap.set(i + 1, false);
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auto fit = bitmap.find_first_fit(2);
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EXPECT_EQ(fit.has_value(), true);
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EXPECT_EQ(fit.value(), i);
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}
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size_t bitmap_size = 1024;
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for (size_t chunk_size = 1; chunk_size < 64; ++chunk_size) {
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for (size_t i = 0; i < bitmap_size - chunk_size; ++i) {
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Bitmap bitmap(bitmap_size, true);
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for (size_t c = 0; c < chunk_size; ++c)
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bitmap.set(i + c, false);
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auto fit = bitmap.find_first_fit(chunk_size);
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EXPECT_EQ(fit.has_value(), true);
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EXPECT_EQ(fit.value(), i);
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}
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}
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}
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TEST_CASE(find_longest_range_of_unset_bits_edge)
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{
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Bitmap bitmap(36, true);
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bitmap.set_range(32, 4, false);
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size_t found_range_size = 0;
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auto result = bitmap.find_longest_range_of_unset_bits(1, found_range_size);
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EXPECT_EQ(result.has_value(), true);
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EXPECT_EQ(result.value(), 32u);
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}
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TEST_MAIN(Bitmap)
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