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/*
* Copyright (C) 2022 The Android Open Source Project
*
* 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 <unistd.h>
#include <thread>
#include <android-base/test_utils.h>
#include <android-base/threads.h>
#include <gtest/gtest.h>
#include <utils/CallStack.h>
#if defined(__ANDROID__)
#include <log/log.h>
#include <log/log_read.h>
#endif
__attribute__((__noinline__)) extern "C" void CurrentCaller(android::String8& backtrace) {
android::CallStack cs;
cs.update();
backtrace = cs.toString();
}
TEST(CallStackTest, current_backtrace) {
android::String8 backtrace;
CurrentCaller(backtrace);
ASSERT_NE(-1, backtrace.find("(CurrentCaller")) << "Full backtrace:\n" << backtrace;
}
__attribute__((__noinline__)) extern "C" void ThreadBusyWait(std::atomic<pid_t>* tid,
volatile bool* done) {
*tid = android::base::GetThreadId();
while (!*done) {
}
}
TEST(CallStackTest, thread_backtrace) {
// Use a volatile to avoid any problems unwinding since sometimes
// accessing a std::atomic does not include unwind data at every
// instruction and leads to failed unwinds.
volatile bool done = false;
std::atomic<pid_t> tid = -1;
std::thread thread([&tid, &done]() { ThreadBusyWait(&tid, &done); });
while (tid == -1) {
}
android::CallStack cs;
cs.update(0, tid);
done = true;
thread.join();
ASSERT_NE(-1, cs.toString().find("(ThreadBusyWait")) << "Full backtrace:\n" << cs.toString();
}
#if defined(__ANDROID__)
TEST(CallStackTest, log_stack) {
android::CallStack::logStack("callstack_test");
auto logger_list = android_logger_list_open(android_name_to_log_id("main"),
ANDROID_LOG_NONBLOCK,
INT_MAX /* tail */, getpid());
ASSERT_NE(nullptr, logger_list);
std::string log;
while (true) {
log_msg log_msg;
auto ret = android_logger_list_read(logger_list, &log_msg);
if (ret == -EAGAIN) {
break;
}
ASSERT_GT(ret, 0);
if (log_msg.msg() == nullptr) {
continue;
}
// First get the tag.
char* msg = &log_msg.msg()[1];
if (std::string(msg) != "callstack_test") {
continue;
}
// Now move past the tag.
msg = &msg[strlen(msg) + 1];
log += msg;
log += '\n';
}
ASSERT_NE("", log) << "No messages found in the log from the test.";
// Look for a backtrace line such as:
// #00 pc 00000000000536e4 libutils_test (testing::Test::Run()+436)
ASSERT_MATCH(log, "#\\d+ pc \\d+");
android_logger_list_close(logger_list);
}
#endif
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