1 /*
2 * Copyright (C) 2015 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 "memory_region.h"
18
19 #include "gtest/gtest.h"
20
21 #include "bit_memory_region.h"
22
23 namespace art {
24
TEST(MemoryRegion,LoadUnaligned)25 TEST(MemoryRegion, LoadUnaligned) {
26 const size_t n = 8;
27 uint8_t data[n] = { 0, 1, 2, 3, 4, 5, 6, 7 };
28 MemoryRegion region(&data, n);
29
30 ASSERT_EQ(0, region.LoadUnaligned<char>(0));
31 ASSERT_EQ(1u
32 + (2u << kBitsPerByte)
33 + (3u << 2 * kBitsPerByte)
34 + (4u << 3 * kBitsPerByte),
35 region.LoadUnaligned<uint32_t>(1));
36 ASSERT_EQ(5 + (6 << kBitsPerByte), region.LoadUnaligned<int16_t>(5));
37 ASSERT_EQ(7u, region.LoadUnaligned<unsigned char>(7));
38 }
39
TEST(MemoryRegion,StoreUnaligned)40 TEST(MemoryRegion, StoreUnaligned) {
41 const size_t n = 8;
42 uint8_t data[n] = { 0, 0, 0, 0, 0, 0, 0, 0 };
43 MemoryRegion region(&data, n);
44
45 region.StoreUnaligned<unsigned char>(0u, 7);
46 region.StoreUnaligned<int16_t>(1, 6 + (5 << kBitsPerByte));
47 region.StoreUnaligned<uint32_t>(3,
48 4u
49 + (3u << kBitsPerByte)
50 + (2u << 2 * kBitsPerByte)
51 + (1u << 3 * kBitsPerByte));
52 region.StoreUnaligned<char>(7, 0);
53
54 uint8_t expected[n] = { 7, 6, 5, 4, 3, 2, 1, 0 };
55 for (size_t i = 0; i < n; ++i) {
56 ASSERT_EQ(expected[i], data[i]);
57 }
58 }
59
TEST(MemoryRegion,TestBits)60 TEST(MemoryRegion, TestBits) {
61 const size_t n = 8;
62 uint8_t data[n] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
63 MemoryRegion region(&data, n);
64 uint32_t value = 0xDEADBEEF;
65 // Try various offsets and lengths.
66 for (size_t bit_offset = 0; bit_offset < 2 * kBitsPerByte; ++bit_offset) {
67 for (size_t length = 0; length < 2 * kBitsPerByte; ++length) {
68 const uint32_t length_mask = (1 << length) - 1;
69 uint32_t masked_value = value & length_mask;
70 BitMemoryRegion bmr(region, bit_offset, length);
71 region.StoreBits(bit_offset, masked_value, length);
72 EXPECT_EQ(region.LoadBits(bit_offset, length), masked_value);
73 EXPECT_EQ(bmr.LoadBits(0, length), masked_value);
74 // Check adjacent bits to make sure they were not incorrectly cleared.
75 EXPECT_EQ(region.LoadBits(0, bit_offset), (1u << bit_offset) - 1);
76 EXPECT_EQ(region.LoadBits(bit_offset + length, length), length_mask);
77 region.StoreBits(bit_offset, length_mask, length);
78 // Store with bit memory region.
79 bmr.StoreBits(0, masked_value, length);
80 EXPECT_EQ(bmr.LoadBits(0, length), masked_value);
81 // Check adjacent bits to make sure they were not incorrectly cleared.
82 EXPECT_EQ(region.LoadBits(0, bit_offset), (1u << bit_offset) - 1);
83 EXPECT_EQ(region.LoadBits(bit_offset + length, length), length_mask);
84 region.StoreBits(bit_offset, length_mask, length);
85 // Flip the value to try different edge bit combinations.
86 value = ~value;
87 }
88 }
89 }
90
91 } // namespace art
92