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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vector>
#include <android-base/logging.h>
#include "dex/compact_offset_table.h"
#include "gtest/gtest.h"
namespace art {
TEST(CompactOffsetTableTest, TestBuildAndAccess) {
const size_t kDebugInfoMinOffset = 1234567;
std::vector<uint32_t> offsets = {
0, 17, 2, 3, 11, 0, 0, 0, 0, 1, 0, 1552, 100, 122, 44, 1234567, 0, 0,
std::numeric_limits<uint32_t>::max() - kDebugInfoMinOffset, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12,
};
// Add some large offset since the debug info section will never be that close to the beginning
// of the file.
for (uint32_t& offset : offsets) {
if (offset != 0u) {
offset += kDebugInfoMinOffset;
}
}
std::vector<uint8_t> data;
uint32_t min_offset = 0;
uint32_t table_offset = 0;
CompactOffsetTable::Build(offsets, /*out*/ &data, /*out*/ &min_offset, /*out*/ &table_offset);
EXPECT_GE(min_offset, kDebugInfoMinOffset);
EXPECT_LT(table_offset, data.size());
ASSERT_GT(data.size(), 0u);
const size_t before_size = offsets.size() * sizeof(offsets.front());
EXPECT_LT(data.size(), before_size);
// Note that the accessor requires the data to be aligned. Use memmap to accomplish this.
std::string error_msg;
// Leave some extra room since we don't copy the table at the start (for testing).
constexpr size_t kExtraOffset = 4 * 128;
std::vector<uint8_t> fake_dex(data.size() + kExtraOffset);
std::copy(data.begin(), data.end(), fake_dex.data() + kExtraOffset);
CompactOffsetTable::Accessor accessor(fake_dex.data() + kExtraOffset, min_offset, table_offset);
for (size_t i = 0; i < offsets.size(); ++i) {
EXPECT_EQ(offsets[i], accessor.GetOffset(i));
}
// Sort to produce a try and produce a smaller table. This happens because the leb diff is smaller
// for sorted increasing order.
std::sort(offsets.begin(), offsets.end());
std::vector<uint8_t> sorted_data;
CompactOffsetTable::Build(offsets,
/*out*/ &sorted_data,
/*out*/ &min_offset,
/*out*/ &table_offset);
EXPECT_LT(sorted_data.size(), data.size());
{
android::base::ScopedLogSeverity sls(android::base::LogSeverity::INFO);
LOG(INFO) << "raw size " << before_size
<< " table size " << data.size()
<< " sorted table size " << sorted_data.size();
}
// Test constructor and accessor that serialize/read offsets.
{
std::vector<uint8_t> data2;
CompactOffsetTable::Build(offsets, /*out*/ &data2);
CompactOffsetTable::Accessor accessor2(&data2[0]);
for (size_t i = 0; i < offsets.size(); ++i) {
EXPECT_EQ(offsets[i], accessor2.GetOffset(i));
}
}
}
} // namespace art
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