blob: 6634c601937dc70b54a4d42a99e59cd3d5d62368 [file] [log] [blame]
/*
* Copyright (C) 2015 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 "bit_memory_region.h"
#include "memory_region.h"
#include "gtest/gtest.h"
namespace art {
TEST(MemoryRegion, LoadUnaligned) {
const size_t n = 8;
uint8_t data[n] = { 0, 1, 2, 3, 4, 5, 6, 7 };
MemoryRegion region(&data, n);
ASSERT_EQ(0, region.LoadUnaligned<char>(0));
ASSERT_EQ(1u
+ (2u << kBitsPerByte)
+ (3u << 2 * kBitsPerByte)
+ (4u << 3 * kBitsPerByte),
region.LoadUnaligned<uint32_t>(1));
ASSERT_EQ(5 + (6 << kBitsPerByte), region.LoadUnaligned<int16_t>(5));
ASSERT_EQ(7u, region.LoadUnaligned<unsigned char>(7));
}
TEST(MemoryRegion, StoreUnaligned) {
const size_t n = 8;
uint8_t data[n] = { 0, 0, 0, 0, 0, 0, 0, 0 };
MemoryRegion region(&data, n);
region.StoreUnaligned<unsigned char>(0u, 7);
region.StoreUnaligned<int16_t>(1, 6 + (5 << kBitsPerByte));
region.StoreUnaligned<uint32_t>(3,
4u
+ (3u << kBitsPerByte)
+ (2u << 2 * kBitsPerByte)
+ (1u << 3 * kBitsPerByte));
region.StoreUnaligned<char>(7, 0);
uint8_t expected[n] = { 7, 6, 5, 4, 3, 2, 1, 0 };
for (size_t i = 0; i < n; ++i) {
ASSERT_EQ(expected[i], data[i]);
}
}
TEST(MemoryRegion, TestBits) {
const size_t n = 8;
uint8_t data[n] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
MemoryRegion region(&data, n);
uint32_t value = 0xDEADBEEF;
// Try various offsets and lengths.
for (size_t bit_offset = 0; bit_offset < 2 * kBitsPerByte; ++bit_offset) {
for (size_t length = 0; length < 2 * kBitsPerByte; ++length) {
const uint32_t length_mask = (1 << length) - 1;
uint32_t masked_value = value & length_mask;
BitMemoryRegion bmr(region, bit_offset, length);
region.StoreBits(bit_offset, masked_value, length);
EXPECT_EQ(region.LoadBits(bit_offset, length), masked_value);
EXPECT_EQ(bmr.LoadBits(0, length), masked_value);
// Check adjacent bits to make sure they were not incorrectly cleared.
EXPECT_EQ(region.LoadBits(0, bit_offset), (1u << bit_offset) - 1);
EXPECT_EQ(region.LoadBits(bit_offset + length, length), length_mask);
region.StoreBits(bit_offset, length_mask, length);
// Store with bit memory region.
bmr.StoreBits(0, masked_value, length);
EXPECT_EQ(bmr.LoadBits(0, length), masked_value);
// Check adjacent bits to make sure they were not incorrectly cleared.
EXPECT_EQ(region.LoadBits(0, bit_offset), (1u << bit_offset) - 1);
EXPECT_EQ(region.LoadBits(bit_offset + length, length), length_mask);
region.StoreBits(bit_offset, length_mask, length);
// Flip the value to try different edge bit combinations.
value = ~value;
}
}
}
} // namespace art