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// Copyright 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 "components/metrics/leak_detector/leak_detector.h"
#include <algorithm>
#include <set>
#include "base/allocator/allocator_extension.h"
#include "base/macros.h"
#include "base/threading/thread_task_runner_handle.h"
#include "components/metrics/proto/memory_leak_report.pb.h"
#include "content/public/test/test_browser_thread_bundle.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace metrics {
namespace {
// Default values for LeakDetector params. See header file for the meaning of
// each parameter.
const float kDefaultSamplingRate = 1.0f;
const size_t kDefaultMaxCallStackUnwindDepth = 4;
const uint64_t kDefaultAnalysisIntervalBytes = 32 * 1024 * 1024; // 32 MiB.
const uint32_t kDefaultSizeSuspicionThreshold = 4;
const uint32_t kDefaultCallStackSuspicionThreshold = 4;
// Observer class that receives leak reports and stores them in |reports_|.
// Only one copy of each unique report will be stored.
class TestObserver : public LeakDetector::Observer {
public:
// Contains a comparator function used to compare MemoryLeakReportProtos for
// uniqueness.
struct Comparator {
bool operator()(const MemoryLeakReportProto& a,
const MemoryLeakReportProto& b) const {
if (a.size_bytes() != b.size_bytes())
return a.size_bytes() < b.size_bytes();
return std::lexicographical_compare(a.call_stack().begin(),
a.call_stack().end(),
b.call_stack().begin(),
b.call_stack().end());
}
};
TestObserver() {}
void OnLeaksFound(
const std::vector<MemoryLeakReportProto>& reports) override {
reports_.insert(reports.begin(), reports.end());
}
const std::set<MemoryLeakReportProto, Comparator>& reports() const {
return reports_;
}
private:
// Container for all leak reports received through OnLeaksFound(). Stores only
// one copy of each unique report.
std::set<MemoryLeakReportProto, Comparator> reports_;
DISALLOW_COPY_AND_ASSIGN(TestObserver);
};
} // namespace
class LeakDetectorTest : public ::testing::Test {
public:
LeakDetectorTest() : detector_(LeakDetector::GetInstance()) {
MemoryLeakReportProto::Params params;
params.set_sampling_rate(kDefaultSamplingRate);
params.set_max_stack_depth(kDefaultMaxCallStackUnwindDepth);
params.set_analysis_interval_bytes(kDefaultAnalysisIntervalBytes);
params.set_size_suspicion_threshold(kDefaultSizeSuspicionThreshold);
params.set_call_stack_suspicion_threshold(
kDefaultCallStackSuspicionThreshold);
EXPECT_TRUE(base::ThreadTaskRunnerHandle::IsSet());
detector_->Init(params, base::ThreadTaskRunnerHandle::Get());
}
protected:
// Points to the instance of LeakDetector returned by GetInstance().
LeakDetector* detector_;
private:
// For supporting content::BrowserThread operations.
content::TestBrowserThreadBundle thread_bundle_;
DISALLOW_COPY_AND_ASSIGN(LeakDetectorTest);
};
TEST_F(LeakDetectorTest, NotifyObservers) {
// Generate two sets of leak reports.
std::vector<MemoryLeakReportProto> reports1(3);
reports1[0].set_size_bytes(8);
for (uint64_t entry : {1, 2, 3, 4}) {
reports1[0].add_call_stack(entry);
}
reports1[1].set_size_bytes(16);
for (uint64_t entry : {5, 6, 7, 8}) {
reports1[1].add_call_stack(entry);
}
reports1[2].set_size_bytes(24);
for (uint64_t entry : {9, 10, 11, 12}) {
reports1[1].add_call_stack(entry);
}
std::vector<MemoryLeakReportProto> reports2(3);
reports2[0].set_size_bytes(32);
for (uint64_t entry : {1, 2, 4, 8}) {
reports2[0].add_call_stack(entry);
}
reports2[1].set_size_bytes(40);
for (uint64_t entry : {16, 32, 64, 128}) {
reports2[1].add_call_stack(entry);
}
reports2[2].set_size_bytes(48);
for (uint64_t entry : {256, 512, 1024, 2048}) {
reports2[2].add_call_stack(entry);
}
// Register three observers;
TestObserver obs1, obs2, obs3;
detector_->AddObserver(&obs1);
detector_->AddObserver(&obs2);
detector_->AddObserver(&obs3);
// Pass both sets of reports to the leak detector.
detector_->NotifyObservers(reports1);
detector_->NotifyObservers(reports2);
// Check that all three observers got both sets of reports, passed in
// separately.
for (const TestObserver* obs : {&obs1, &obs2, &obs3}) {
EXPECT_EQ(6U, obs->reports().size());
for (const auto& report : {reports1[0], reports1[1], reports1[2],
reports2[0], reports2[1], reports2[2]}) {
EXPECT_TRUE(obs->reports().find(report) != obs->reports().end());
}
}
}
} // namespace metrics
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