QuicAlarms are now allocated out of an arena in QuicConnection

net/quic/quic_one_block_arena_test.cc

+// Copyright (c) 2016 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 "net/quic/quic_one_block_arena.h"
+
+#include "net/quic/interval_set.h"
+#include "net/quic/quic_flags.h"
+#include "net/quic/quic_utils.h"
+#include "net/test/gtest_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+namespace {
+
+static const uint32_t kMaxAlign = 8;
+
+struct TestObject {
+  uint32_t value;
+};
+
+TEST(QuicOneBlockArenaTest, AllocateSuccess) {
+  FLAGS_quic_enable_arena_allocation = true;
+  QuicOneBlockArena<1024> arena;
+  QuicArenaScopedPtr<TestObject> ptr = arena.New<TestObject>();
+  EXPECT_TRUE(ptr.is_from_arena());
+}
+
+TEST(QuicOneBlockArenaTest, Disabled) {
+  FLAGS_quic_enable_arena_allocation = false;
+  QuicOneBlockArena<1024> arena;
+  QuicArenaScopedPtr<TestObject> ptr = arena.New<TestObject>();
+  EXPECT_FALSE(ptr.is_from_arena());
+}
+
+TEST(QuicOneBlockArenaTest, Exhaust) {
+  FLAGS_quic_enable_arena_allocation = true;
+  QuicOneBlockArena<1024> arena;
+  for (size_t i = 0; i < 1024 / kMaxAlign; ++i) {
+    QuicArenaScopedPtr<TestObject> ptr = arena.New<TestObject>();
+    EXPECT_TRUE(ptr.is_from_arena());
+  }
+  QuicArenaScopedPtr<TestObject> ptr;
+  EXPECT_DFATAL(ptr = arena.New<TestObject>(),
+                "Ran out of space in QuicOneBlockArena");
+  EXPECT_FALSE(ptr.is_from_arena());
+}
+
+TEST(QuicOneBlockArenaTest, NoOverlaps) {
+  FLAGS_quic_enable_arena_allocation = true;
+  QuicOneBlockArena<1024> arena;
+  std::vector<QuicArenaScopedPtr<TestObject>> objects;
+  IntervalSet<uintptr_t> used;
+  for (size_t i = 0; i < 1024 / kMaxAlign; ++i) {
+    QuicArenaScopedPtr<TestObject> ptr = arena.New<TestObject>();
+    EXPECT_TRUE(ptr.is_from_arena());
+
+    uintptr_t begin = reinterpret_cast<uintptr_t>(ptr.get());
+    uintptr_t end = begin + sizeof(TestObject);
+    EXPECT_FALSE(used.Contains(begin));
+    EXPECT_FALSE(used.Contains(end - 1));
+    used.Add(begin, end);
+  }
+}
+
+}  // namespace
+}  // namespace net