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- /*
- * Copyright 2016-present Facebook, Inc.
- *
- * 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 <condition_variable>
- #include <mutex>
- #include <sstream>
- #include <stdexcept>
- #include <thread>
- #include <folly/experimental/exception_tracer/ExceptionCounterLib.h>
- #include <folly/portability/GTest.h>
- struct MyException {};
- // clang-format off
- [[noreturn]] void bar() {
- throw std::runtime_error("hello");
- }
- [[noreturn]] void foo() {
- throw MyException();
- }
- [[noreturn]] void baz() {
- foo();
- }
- // clang-format on
- using namespace folly::exception_tracer;
- template <typename F>
- void throwAndCatch(F f) {
- try {
- f();
- } catch (...) {
- // ignore
- }
- }
- TEST(ExceptionCounter, oneThread) {
- throwAndCatch(foo);
- // Use volatile to prevent loop unrolling (it screws up stack frame grouping).
- for (volatile int i = 0; i < 10; ++i) {
- throwAndCatch(bar);
- }
- auto stats = getExceptionStatistics();
- EXPECT_EQ(stats.size(), 2);
- EXPECT_EQ(stats[0].count, 10);
- EXPECT_EQ(stats[1].count, 1);
- EXPECT_EQ(*(stats[0].info.type), typeid(std::runtime_error));
- EXPECT_EQ(*(stats[1].info.type), typeid(MyException));
- }
- TEST(ExceptionCounter, testClearExceptionStatistics) {
- throwAndCatch(foo);
- auto stats = getExceptionStatistics();
- EXPECT_EQ(stats.size(), 1);
- stats = getExceptionStatistics();
- EXPECT_EQ(stats.size(), 0);
- }
- TEST(ExceptionCounter, testDifferentStacks) {
- throwAndCatch(foo);
- throwAndCatch(baz);
- auto stats = getExceptionStatistics();
- EXPECT_EQ(stats.size(), 2);
- }
- TEST(ExceptionCounter, multyThreads) {
- constexpr size_t kNumIterations = 10000;
- constexpr size_t kNumThreads = 10;
- std::vector<std::thread> threads;
- threads.resize(kNumThreads);
- std::mutex preparedMutex;
- std::mutex finishedMutex;
- std::condition_variable preparedBarrier;
- std::condition_variable finishedBarrier;
- int preparedThreads = 0;
- bool finished = false;
- for (auto& t : threads) {
- t = std::thread([&]() {
- for (size_t i = 0; i < kNumIterations; ++i) {
- throwAndCatch(foo);
- }
- {
- std::unique_lock<std::mutex> lock(preparedMutex);
- ++preparedThreads;
- preparedBarrier.notify_one();
- }
- std::unique_lock<std::mutex> lock(finishedMutex);
- finishedBarrier.wait(lock, [&]() { return finished; });
- });
- }
- {
- std::unique_lock<std::mutex> lock(preparedMutex);
- preparedBarrier.wait(
- lock, [&]() { return preparedThreads == kNumThreads; });
- }
- auto stats = getExceptionStatistics();
- EXPECT_EQ(stats.size(), 1);
- EXPECT_EQ(stats[0].count, kNumIterations * kNumThreads);
- {
- std::unique_lock<std::mutex> lock(finishedMutex);
- finished = true;
- finishedBarrier.notify_all();
- }
- for (auto& t : threads) {
- t.join();
- }
- }
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