1 files changed, 127 insertions, 0 deletions
diff --git a/runtime/base/arena_allocator_test.cc b/runtime/base/arena_allocator_test.cc
new file mode 100644
index 0000000000..9de3cc4312
--- /dev/null
+++ b/runtime/base/arena_allocator_test.cc
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2013 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 "base/arena_allocator.h"
+#include "base/arena_bit_vector.h"
+#include "gtest/gtest.h"
+
+namespace art {
+
+class ArenaAllocatorTest : public testing::Test {
+ protected:
+  size_t NumberOfArenas(ArenaAllocator* arena) {
+    size_t result = 0u;
+    for (Arena* a = arena->arena_head_; a != nullptr; a = a->next_) {
+      ++result;
+    }
+    return result;
+  }
+};
+
+TEST_F(ArenaAllocatorTest, Test) {
+  ArenaPool pool;
+  ArenaAllocator arena(&pool);
+  ArenaBitVector bv(&arena, 10, true);
+  bv.SetBit(5);
+  EXPECT_EQ(1U, bv.GetStorageSize());
+  bv.SetBit(35);
+  EXPECT_EQ(2U, bv.GetStorageSize());
+}
+
+TEST_F(ArenaAllocatorTest, MakeDefined) {
+  // Regression test to make sure we mark the allocated area defined.
+  ArenaPool pool;
+  static constexpr size_t kSmallArraySize = 10;
+  static constexpr size_t kLargeArraySize = 50;
+  uint32_t* small_array;
+  {
+    // Allocate a small array from an arena and release it.
+    ArenaAllocator arena(&pool);
+    small_array = arena.AllocArray<uint32_t>(kSmallArraySize);
+    ASSERT_EQ(0u, small_array[kSmallArraySize - 1u]);
+  }
+  {
+    // Reuse the previous arena and allocate more than previous allocation including red zone.
+    ArenaAllocator arena(&pool);
+    uint32_t* large_array = arena.AllocArray<uint32_t>(kLargeArraySize);
+    ASSERT_EQ(0u, large_array[kLargeArraySize - 1u]);
+    // Verify that the allocation was made on the same arena.
+    ASSERT_EQ(small_array, large_array);
+  }
+}
+
+TEST_F(ArenaAllocatorTest, LargeAllocations) {
+  {
+    ArenaPool pool;
+    ArenaAllocator arena(&pool);
+    // Note: Leaving some space for memory tool red zones.
+    void* alloc1 = arena.Alloc(Arena::kDefaultSize * 5 / 8);
+    void* alloc2 = arena.Alloc(Arena::kDefaultSize * 2 / 8);
+    ASSERT_NE(alloc1, alloc2);
+    ASSERT_EQ(1u, NumberOfArenas(&arena));
+  }
+  {
+    ArenaPool pool;
+    ArenaAllocator arena(&pool);
+    void* alloc1 = arena.Alloc(Arena::kDefaultSize * 13 / 16);
+    void* alloc2 = arena.Alloc(Arena::kDefaultSize * 11 / 16);
+    ASSERT_NE(alloc1, alloc2);
+    ASSERT_EQ(2u, NumberOfArenas(&arena));
+    void* alloc3 = arena.Alloc(Arena::kDefaultSize * 7 / 16);
+    ASSERT_NE(alloc1, alloc3);
+    ASSERT_NE(alloc2, alloc3);
+    ASSERT_EQ(3u, NumberOfArenas(&arena));
+  }
+  {
+    ArenaPool pool;
+    ArenaAllocator arena(&pool);
+    void* alloc1 = arena.Alloc(Arena::kDefaultSize * 13 / 16);
+    void* alloc2 = arena.Alloc(Arena::kDefaultSize * 9 / 16);
+    ASSERT_NE(alloc1, alloc2);
+    ASSERT_EQ(2u, NumberOfArenas(&arena));
+    // Note: Leaving some space for memory tool red zones.
+    void* alloc3 = arena.Alloc(Arena::kDefaultSize * 5 / 16);
+    ASSERT_NE(alloc1, alloc3);
+    ASSERT_NE(alloc2, alloc3);
+    ASSERT_EQ(2u, NumberOfArenas(&arena));
+  }
+  {
+    ArenaPool pool;
+    ArenaAllocator arena(&pool);
+    void* alloc1 = arena.Alloc(Arena::kDefaultSize * 9 / 16);
+    void* alloc2 = arena.Alloc(Arena::kDefaultSize * 13 / 16);
+    ASSERT_NE(alloc1, alloc2);
+    ASSERT_EQ(2u, NumberOfArenas(&arena));
+    // Note: Leaving some space for memory tool red zones.
+    void* alloc3 = arena.Alloc(Arena::kDefaultSize * 5 / 16);
+    ASSERT_NE(alloc1, alloc3);
+    ASSERT_NE(alloc2, alloc3);
+    ASSERT_EQ(2u, NumberOfArenas(&arena));
+  }
+  {
+    ArenaPool pool;
+    ArenaAllocator arena(&pool);
+    // Note: Leaving some space for memory tool red zones.
+    for (size_t i = 0; i != 15; ++i) {
+      arena.Alloc(Arena::kDefaultSize * 1 / 16);    // Allocate 15 times from the same arena.
+      ASSERT_EQ(i + 1u, NumberOfArenas(&arena));
+      arena.Alloc(Arena::kDefaultSize * 17 / 16);   // Allocate a separate arena.
+      ASSERT_EQ(i + 2u, NumberOfArenas(&arena));
+    }
+  }
+}
+
+}  // namespace art