1 files changed, 143 insertions, 0 deletions
diff --git a/libunwindstack/tests/MemoryCacheTest.cpp b/libunwindstack/tests/MemoryCacheTest.cpp
new file mode 100644
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--- /dev/null
+++ b/libunwindstack/tests/MemoryCacheTest.cpp
@@ -0,0 +1,143 @@
+/*
+ * 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