1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <vector>
18
19 #include <android-base/logging.h>
20 #include "dex/compact_offset_table.h"
21 #include "gtest/gtest.h"
22
23 namespace art {
24
TEST(CompactOffsetTableTest,TestBuildAndAccess)25 TEST(CompactOffsetTableTest, TestBuildAndAccess) {
26 const size_t kDebugInfoMinOffset = 1234567;
27 std::vector<uint32_t> offsets = {
28 0, 17, 2, 3, 11, 0, 0, 0, 0, 1, 0, 1552, 100, 122, 44, 1234567, 0, 0,
29 std::numeric_limits<uint32_t>::max() - kDebugInfoMinOffset, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
30 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12,
31 };
32 // Add some large offset since the debug info section will never be that close to the beginning
33 // of the file.
34 for (uint32_t& offset : offsets) {
35 if (offset != 0u) {
36 offset += kDebugInfoMinOffset;
37 }
38 }
39
40 std::vector<uint8_t> data;
41 uint32_t min_offset = 0;
42 uint32_t table_offset = 0;
43 CompactOffsetTable::Build(offsets, /*out*/ &data, /*out*/ &min_offset, /*out*/ &table_offset);
44 EXPECT_GE(min_offset, kDebugInfoMinOffset);
45 EXPECT_LT(table_offset, data.size());
46 ASSERT_GT(data.size(), 0u);
47 const size_t before_size = offsets.size() * sizeof(offsets.front());
48 EXPECT_LT(data.size(), before_size);
49
50 // Note that the accessor requires the data to be aligned. Use memmap to accomplish this.
51 std::string error_msg;
52 // Leave some extra room since we don't copy the table at the start (for testing).
53 constexpr size_t kExtraOffset = 4 * 128;
54 std::vector<uint8_t> fake_dex(data.size() + kExtraOffset);
55 std::copy(data.begin(), data.end(), fake_dex.data() + kExtraOffset);
56
57 CompactOffsetTable::Accessor accessor(fake_dex.data() + kExtraOffset, min_offset, table_offset);
58 for (size_t i = 0; i < offsets.size(); ++i) {
59 EXPECT_EQ(offsets[i], accessor.GetOffset(i));
60 }
61
62 // Sort to produce a try and produce a smaller table. This happens because the leb diff is smaller
63 // for sorted increasing order.
64 std::sort(offsets.begin(), offsets.end());
65 std::vector<uint8_t> sorted_data;
66 CompactOffsetTable::Build(offsets,
67 /*out*/ &sorted_data,
68 /*out*/ &min_offset,
69 /*out*/ &table_offset);
70 EXPECT_LT(sorted_data.size(), data.size());
71 {
72 android::base::ScopedLogSeverity sls(android::base::LogSeverity::INFO);
73 LOG(INFO) << "raw size " << before_size
74 << " table size " << data.size()
75 << " sorted table size " << sorted_data.size();
76 }
77
78 // Test constructor and accessor that serialize/read offsets.
79 {
80 std::vector<uint8_t> data2;
81 CompactOffsetTable::Build(offsets, /*out*/ &data2);
82 CompactOffsetTable::Accessor accessor2(&data2[0]);
83 for (size_t i = 0; i < offsets.size(); ++i) {
84 EXPECT_EQ(offsets[i], accessor2.GetOffset(i));
85 }
86 }
87 }
88
89 } // namespace art
90