1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <log/log.h>
20 #include <backtrace/Backtrace.h>
21 #include <memory>
22 
23 class CallStack {
24 public:
25     // Create a callstack with the current thread's stack trace.
26     // Immediately dump it to logcat using the given logtag.
log(const char * logtag)27     static void log(const char* logtag) noexcept {
28         std::unique_ptr<Backtrace> backtrace(
29                 Backtrace::Create(BACKTRACE_CURRENT_PROCESS, BACKTRACE_CURRENT_THREAD));
30         if (backtrace->Unwind(2)) {
31             for (size_t i = 0, c = backtrace->NumFrames(); i < c; i++) {
32                 __android_log_print(ANDROID_LOG_DEBUG, logtag, "%s",
33                         backtrace->FormatFrameData(i).c_str());
34             }
35         }
36     }
37 };
38 
39