components/metrics: Add runtime memory leak detector

components/metrics/leak_detector/ranked_list_unittest.cc

Index: components/metrics/leak_detector/ranked_list_unittest.cc
diff --git a/components/metrics/leak_detector/ranked_list_unittest.cc b/components/metrics/leak_detector/ranked_list_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..297db747c0173a7f732ed2cd6604e81d9a91f60b
--- /dev/null
+++ b/components/metrics/leak_detector/ranked_list_unittest.cc
@@ -0,0 +1,300 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/metrics/leak_detector/ranked_list.h"
+
+#include "base/macros.h"
+#include "components/metrics/leak_detector/custom_allocator.h"
+#include "components/metrics/leak_detector/leak_detector_value_type.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace metrics {
+namespace leak_detector {
+
+namespace {
+
+// Makes it easier to instantiate LeakDetectorValueTypes.
+LeakDetectorValueType Value(uint32_t value) {
+  return LeakDetectorValueType(value);
+}
+
+}  // namespace
+
+class RankedListTest : public ::testing::Test {
+ public:
+  RankedListTest() {}
+
+  void SetUp() override {
+    CustomAllocator::Initialize();
+  }
+  void TearDown() override {
+    EXPECT_TRUE(CustomAllocator::Shutdown());
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(RankedListTest);
+};
+
+TEST_F(RankedListTest, Iterators) {
+  RankedList list(10);
+  EXPECT_TRUE(list.begin() == list.end());
+
+  list.Add(Value(0x1234), 100);
+  EXPECT_FALSE(list.begin() == list.end());
+}
+
+TEST_F(RankedListTest, SingleInsertion) {
+  RankedList list(10);
+  EXPECT_EQ(0U, list.size());
+
+  list.Add(Value(0x1234), 100);
+  EXPECT_EQ(1U, list.size());
+
+  auto iter = list.begin();
+  EXPECT_EQ(0x1234U, iter->value.size());
+  EXPECT_EQ(100, iter->count);
+}
+
+TEST_F(RankedListTest, InOrderInsertion) {
+  RankedList list(10);
+  EXPECT_EQ(0U, list.size());
+
+  list.Add(Value(0x1234), 100);
+  EXPECT_EQ(1U, list.size());
+  list.Add(Value(0x2345), 95);
+  EXPECT_EQ(2U, list.size());
+  list.Add(Value(0x3456), 90);
+  EXPECT_EQ(3U, list.size());
+  list.Add(Value(0x4567), 85);
+  EXPECT_EQ(4U, list.size());
+  list.Add(Value(0x5678), 80);
+  EXPECT_EQ(5U, list.size());
+
+  // Iterate through the contents to make sure they match what went in.
+  const RankedList::Entry kExpectedValues[] = {
+    { Value(0x1234), 100 },
+    { Value(0x2345), 95 },
+    { Value(0x3456), 90 },
+    { Value(0x4567), 85 },
+    { Value(0x5678), 80 },
+  };
+
+  size_t index = 0;
+  for (const auto& entry : list) {
+    EXPECT_LT(index, arraysize(kExpectedValues));
+    EXPECT_EQ(kExpectedValues[index].value.size(), entry.value.size());
+    EXPECT_EQ(kExpectedValues[index].count, entry.count);
+    ++index;
+  }
+}
+
+TEST_F(RankedListTest, ReverseOrderInsertion) {
+  RankedList list(10);
+  EXPECT_EQ(0U, list.size());
+
+  list.Add(Value(0x1234), 0);
+  EXPECT_EQ(1U, list.size());
+  list.Add(Value(0x2345), 5);
+  EXPECT_EQ(2U, list.size());
+  list.Add(Value(0x3456), 10);
+  EXPECT_EQ(3U, list.size());
+  list.Add(Value(0x4567), 15);
+  EXPECT_EQ(4U, list.size());
+  list.Add(Value(0x5678), 20);
+  EXPECT_EQ(5U, list.size());
+
+  // Iterate through the contents to make sure they match what went in.
+  const RankedList::Entry kExpectedValues[] = {
+    { Value(0x5678), 20 },
+    { Value(0x4567), 15 },
+    { Value(0x3456), 10 },
+    { Value(0x2345), 5 },
+    { Value(0x1234), 0 },
+  };
+
+  size_t index = 0;
+  for (const auto& entry : list) {
+    EXPECT_LT(index, arraysize(kExpectedValues));
+    EXPECT_EQ(kExpectedValues[index].value.size(), entry.value.size());
+    EXPECT_EQ(kExpectedValues[index].count, entry.count);
+    ++index;
+  }
+}
+
+TEST_F(RankedListTest, UnorderedInsertion) {
+  RankedList list(10);
+  EXPECT_EQ(0U, list.size());
+
+  list.Add(Value(0x1234), 15);
+  list.Add(Value(0x2345), 20);
+  list.Add(Value(0x3456), 10);
+  list.Add(Value(0x4567), 30);
+  list.Add(Value(0x5678), 25);
+  EXPECT_EQ(5U, list.size());
+
+  // Iterate through the contents to make sure they match what went in.
+  const RankedList::Entry kExpectedValues1[] = {
+    { Value(0x4567), 30 },
+    { Value(0x5678), 25 },
+    { Value(0x2345), 20 },
+    { Value(0x1234), 15 },
+    { Value(0x3456), 10 },
+  };
+
+  size_t index = 0;
+  for (const auto& entry : list) {
+    EXPECT_LT(index, arraysize(kExpectedValues1));
+    EXPECT_EQ(kExpectedValues1[index].value.size(), entry.value.size());
+    EXPECT_EQ(kExpectedValues1[index].count, entry.count);
+    ++index;
+  }
+
+  // Add more items.
+  list.Add(Value(0x6789), 35);
+  list.Add(Value(0x789a), 40);
+  list.Add(Value(0x89ab), 50);
+  list.Add(Value(0x9abc), 5);
+  list.Add(Value(0xabcd), 0);
+  EXPECT_EQ(10U, list.size());
+
+  // Iterate through the contents to make sure they match what went in.
+  const RankedList::Entry kExpectedValues2[] = {
+    { Value(0x89ab), 50 },
+    { Value(0x789a), 40 },
+    { Value(0x6789), 35 },
+    { Value(0x4567), 30 },
+    { Value(0x5678), 25 },
+    { Value(0x2345), 20 },
+    { Value(0x1234), 15 },
+    { Value(0x3456), 10 },
+    { Value(0x9abc), 5 },
+    { Value(0xabcd), 0 },
+  };
+
+  index = 0;
+  for (const auto& entry : list) {
+    EXPECT_LT(index, arraysize(kExpectedValues2));
+    EXPECT_EQ(kExpectedValues2[index].value.size(), entry.value.size());
+    EXPECT_EQ(kExpectedValues2[index].count, entry.count);
+    ++index;
+  }
+}
+
+TEST_F(RankedListTest, InsertionWithOverflow) {
+  RankedList list(5);
+  EXPECT_EQ(0U, list.size());
+
+  list.Add(Value(0x1234), 15);
+  list.Add(Value(0x2345), 20);
+  list.Add(Value(0x3456), 10);
+  list.Add(Value(0x4567), 30);
+  list.Add(Value(0x5678), 25);
+  EXPECT_EQ(5U, list.size());
+
+  // These values will not make it into the list, which is now full.
+  list.Add(Value(0x6789), 0);
+  EXPECT_EQ(5U, list.size());
+  list.Add(Value(0x789a), 5);
+  EXPECT_EQ(5U, list.size());
+
+  // Iterate through the contents to make sure they match what went in.
+  const RankedList::Entry kExpectedValues1[] = {
+    { Value(0x4567), 30 },
+    { Value(0x5678), 25 },
+    { Value(0x2345), 20 },
+    { Value(0x1234), 15 },
+    { Value(0x3456), 10 },
+  };
+
+  size_t index = 0;
+  for (const auto& entry : list) {
+    EXPECT_LT(index, arraysize(kExpectedValues1));
+    EXPECT_EQ(kExpectedValues1[index].value.size(), entry.value.size());
+    EXPECT_EQ(kExpectedValues1[index].count, entry.count);
+    ++index;
+  }
+
+  // Insert some more values that go in the middle of the list.
+  list.Add(Value(0x89ab), 27);
+  EXPECT_EQ(5U, list.size());
+  list.Add(Value(0x9abc), 22);
+  EXPECT_EQ(5U, list.size());
+
+  // Iterate through the contents to make sure they match what went in.
+  const RankedList::Entry kExpectedValues2[] = {
+    { Value(0x4567), 30 },
+    { Value(0x89ab), 27 },
+    { Value(0x5678), 25 },
+    { Value(0x9abc), 22 },
+    { Value(0x2345), 20 },
+  };
+
+  index = 0;
+  for (const auto& entry : list) {
+    EXPECT_LT(index, arraysize(kExpectedValues2));
+    EXPECT_EQ(kExpectedValues2[index].value.size(), entry.value.size());
+    EXPECT_EQ(kExpectedValues2[index].count, entry.count);
+    ++index;
+  }
+
+  // Insert some more values at the front of the list.
+  list.Add(Value(0xabcd), 40);
+  EXPECT_EQ(5U, list.size());
+  list.Add(Value(0xbcde), 35);
+  EXPECT_EQ(5U, list.size());
+
+  // Iterate through the contents to make sure they match what went in.
+  const RankedList::Entry kExpectedValues3[] = {
+    { Value(0xabcd), 40 },
+    { Value(0xbcde), 35 },
+    { Value(0x4567), 30 },
+    { Value(0x89ab), 27 },
+    { Value(0x5678), 25 },
+  };
+
+  index = 0;
+  for (const auto& entry : list) {
+    EXPECT_LT(index, arraysize(kExpectedValues3));
+    EXPECT_EQ(kExpectedValues3[index].value.size(), entry.value.size());
+    EXPECT_EQ(kExpectedValues3[index].count, entry.count);
+    ++index;
+  }
+}
+
+TEST_F(RankedListTest, MoveOperation) {
+  const RankedList::Entry kExpectedValues[] = {
+    { Value(0x89ab), 50 },
+    { Value(0x789a), 40 },
+    { Value(0x6789), 35 },
+    { Value(0x4567), 30 },
+    { Value(0x5678), 25 },
+    { Value(0x2345), 20 },
+    { Value(0x1234), 15 },
+    { Value(0x3456), 10 },
+    { Value(0x9abc), 5 },
+    { Value(0xabcd), 0 },
+  };
+
+  RankedList source_list(10);
+  for (const RankedList::Entry& entry : kExpectedValues) {
+    source_list.Add(entry.value, entry.count);
+  }
+  EXPECT_EQ(10U, source_list.size());
+
+  RankedList dest_list(25);  // This should be changed by the move.
+  dest_list = source_list.Pass();
+  EXPECT_EQ(10U, dest_list.size());
+  EXPECT_EQ(10U, dest_list.max_size());
+
+  size_t index = 0;
+  for (const auto& entry : dest_list) {
+    EXPECT_LT(index, arraysize(kExpectedValues));
+    EXPECT_EQ(kExpectedValues[index].value.size(), entry.value.size());
+    EXPECT_EQ(kExpectedValues[index].count, entry.count);
+    ++index;
+  }
+}
+
+}  // namespace leak_detector
+}  // namespace metrics