upload android base code part3

android/art/runtime/memory_region_test.cc

@@ -0,0 +1,90 @@
+/*
+ * 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