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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 <stdint.h>
#include <vector>
#include <gtest/gtest.h>
#include <unwindstack/Memory.h>
#include "MemoryFake.h"
namespace unwindstack {
class MemoryCacheTest : public ::testing::Test {
protected:
void SetUp() override {
memory_ = new MemoryFake;
memory_cache_.reset(new MemoryCache(memory_));
memory_->SetMemoryBlock(0x8000, 4096, 0xab);
memory_->SetMemoryBlock(0x9000, 4096, 0xde);
memory_->SetMemoryBlock(0xa000, 3000, 0x50);
}
MemoryFake* memory_;
std::unique_ptr<MemoryCache> memory_cache_;
constexpr static size_t kMaxCachedSize = 64;
};
TEST_F(MemoryCacheTest, cached_read) {
for (size_t i = 1; i <= kMaxCachedSize; i++) {
std::vector<uint8_t> buffer(i);
ASSERT_TRUE(memory_cache_->ReadFully(0x8000 + i, buffer.data(), i))
<< "Read failed at size " << i;
ASSERT_EQ(std::vector<uint8_t>(i, 0xab), buffer) << "Failed at size " << i;
}
// Verify the cached data is used.
memory_->SetMemoryBlock(0x8000, 4096, 0xff);
for (size_t i = 1; i <= kMaxCachedSize; i++) {
std::vector<uint8_t> buffer(i);
ASSERT_TRUE(memory_cache_->ReadFully(0x8000 + i, buffer.data(), i))
<< "Read failed at size " << i;
ASSERT_EQ(std::vector<uint8_t>(i, 0xab), buffer) << "Failed at size " << i;
}
}
TEST_F(MemoryCacheTest, no_cached_read_after_clear) {
for (size_t i = 1; i <= kMaxCachedSize; i++) {
std::vector<uint8_t> buffer(i);
ASSERT_TRUE(memory_cache_->ReadFully(0x8000 + i, buffer.data(), i))
<< "Read failed at size " << i;
ASSERT_EQ(std::vector<uint8_t>(i, 0xab), buffer) << "Failed at size " << i;
}
// Verify the cached data is not used after a reset.
memory_cache_->Clear();
memory_->SetMemoryBlock(0x8000, 4096, 0xff);
for (size_t i = 1; i <= kMaxCachedSize; i++) {
std::vector<uint8_t> buffer(i);
ASSERT_TRUE(memory_cache_->ReadFully(0x8000 + i, buffer.data(), i))
<< "Read failed at size " << i;
ASSERT_EQ(std::vector<uint8_t>(i, 0xff), buffer) << "Failed at size " << i;
}
}
TEST_F(MemoryCacheTest, cached_read_across_caches) {
std::vector<uint8_t> expect(16, 0xab);
expect.resize(32, 0xde);
std::vector<uint8_t> buffer(32);
ASSERT_TRUE(memory_cache_->ReadFully(0x8ff0, buffer.data(), 32));
ASSERT_EQ(expect, buffer);
// Verify the cached data is used.
memory_->SetMemoryBlock(0x8000, 4096, 0xff);
memory_->SetMemoryBlock(0x9000, 4096, 0xff);
ASSERT_TRUE(memory_cache_->ReadFully(0x8ff0, buffer.data(), 32));
ASSERT_EQ(expect, buffer);
}
TEST_F(MemoryCacheTest, no_cache_read) {
for (size_t i = kMaxCachedSize + 1; i < 2 * kMaxCachedSize; i++) {
std::vector<uint8_t> buffer(i);
ASSERT_TRUE(memory_cache_->ReadFully(0x8000 + i, buffer.data(), i))
<< "Read failed at size " << i;
ASSERT_EQ(std::vector<uint8_t>(i, 0xab), buffer) << "Failed at size " << i;
}
// Verify the cached data is not used.
memory_->SetMemoryBlock(0x8000, 4096, 0xff);
for (size_t i = kMaxCachedSize + 1; i < 2 * kMaxCachedSize; i++) {
std::vector<uint8_t> buffer(i);
ASSERT_TRUE(memory_cache_->ReadFully(0x8000 + i, buffer.data(), i))
<< "Read failed at size " << i;
ASSERT_EQ(std::vector<uint8_t>(i, 0xff), buffer) << "Failed at size " << i;
}
}
TEST_F(MemoryCacheTest, read_for_cache_fail) {
std::vector<uint8_t> buffer(kMaxCachedSize);
ASSERT_TRUE(memory_cache_->ReadFully(0xa010, buffer.data(), kMaxCachedSize));
ASSERT_EQ(std::vector<uint8_t>(kMaxCachedSize, 0x50), buffer);
// Verify the cached data is not used.
memory_->SetMemoryBlock(0xa000, 3000, 0xff);
ASSERT_TRUE(memory_cache_->ReadFully(0xa010, buffer.data(), kMaxCachedSize));
ASSERT_EQ(std::vector<uint8_t>(kMaxCachedSize, 0xff), buffer);
}
TEST_F(MemoryCacheTest, read_for_cache_fail_cross) {
std::vector<uint8_t> expect(16, 0xde);
expect.resize(32, 0x50);
std::vector<uint8_t> buffer(32);
ASSERT_TRUE(memory_cache_->ReadFully(0x9ff0, buffer.data(), 32));
ASSERT_EQ(expect, buffer);
// Verify the cached data is not used for the second half but for the first.
memory_->SetMemoryBlock(0xa000, 3000, 0xff);
ASSERT_TRUE(memory_cache_->ReadFully(0x9ff0, buffer.data(), 32));
expect.resize(16);
expect.resize(32, 0xff);
ASSERT_EQ(expect, buffer);
}
} // namespace unwindstack
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