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// Copyright (c) 2011 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 "base/debug/leak_tracker.h"
#include <memory>
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace debug {
namespace {
class ClassA {
private:
LeakTracker<ClassA> leak_tracker_;
};
class ClassB {
private:
LeakTracker<ClassB> leak_tracker_;
};
#ifndef ENABLE_LEAK_TRACKER
// If leak tracking is disabled, we should do nothing.
TEST(LeakTrackerTest, NotEnabled) {
EXPECT_EQ(-1, LeakTracker<ClassA>::NumLiveInstances());
EXPECT_EQ(-1, LeakTracker<ClassB>::NumLiveInstances());
// Use unique_ptr so compiler doesn't complain about unused variables.
std::unique_ptr<ClassA> a1(new ClassA);
std::unique_ptr<ClassB> b1(new ClassB);
std::unique_ptr<ClassB> b2(new ClassB);
EXPECT_EQ(-1, LeakTracker<ClassA>::NumLiveInstances());
EXPECT_EQ(-1, LeakTracker<ClassB>::NumLiveInstances());
}
#else
TEST(LeakTrackerTest, Basic) {
{
ClassA a1;
EXPECT_EQ(1, LeakTracker<ClassA>::NumLiveInstances());
EXPECT_EQ(0, LeakTracker<ClassB>::NumLiveInstances());
ClassB b1;
ClassB b2;
EXPECT_EQ(1, LeakTracker<ClassA>::NumLiveInstances());
EXPECT_EQ(2, LeakTracker<ClassB>::NumLiveInstances());
std::unique_ptr<ClassA> a2(new ClassA);
EXPECT_EQ(2, LeakTracker<ClassA>::NumLiveInstances());
EXPECT_EQ(2, LeakTracker<ClassB>::NumLiveInstances());
a2.reset();
EXPECT_EQ(1, LeakTracker<ClassA>::NumLiveInstances());
EXPECT_EQ(2, LeakTracker<ClassB>::NumLiveInstances());
}
EXPECT_EQ(0, LeakTracker<ClassA>::NumLiveInstances());
EXPECT_EQ(0, LeakTracker<ClassB>::NumLiveInstances());
}
// Try some orderings of create/remove to hit different cases in the linked-list
// assembly.
TEST(LeakTrackerTest, LinkedList) {
EXPECT_EQ(0, LeakTracker<ClassB>::NumLiveInstances());
std::unique_ptr<ClassA> a1(new ClassA);
std::unique_ptr<ClassA> a2(new ClassA);
std::unique_ptr<ClassA> a3(new ClassA);
std::unique_ptr<ClassA> a4(new ClassA);
EXPECT_EQ(4, LeakTracker<ClassA>::NumLiveInstances());
// Remove the head of the list (a1).
a1.reset();
EXPECT_EQ(3, LeakTracker<ClassA>::NumLiveInstances());
// Remove the tail of the list (a4).
a4.reset();
EXPECT_EQ(2, LeakTracker<ClassA>::NumLiveInstances());
// Append to the new tail of the list (a3).
std::unique_ptr<ClassA> a5(new ClassA);
EXPECT_EQ(3, LeakTracker<ClassA>::NumLiveInstances());
a2.reset();
a3.reset();
EXPECT_EQ(1, LeakTracker<ClassA>::NumLiveInstances());
a5.reset();
EXPECT_EQ(0, LeakTracker<ClassA>::NumLiveInstances());
}
TEST(LeakTrackerTest, NoOpCheckForLeaks) {
// There are no live instances of ClassA, so this should do nothing.
LeakTracker<ClassA>::CheckForLeaks();
}
#endif // ENABLE_LEAK_TRACKER
} // namespace
} // namespace debug
} // namespace base
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