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/*
* Copyright (C) 2018 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 <unwindstack/LocalUnwinder.h>
#include <vector>
extern "C" void TestlibLevel4(void* unwinder_data, void* frame_data) {
unwindstack::LocalUnwinder* unwinder =
reinterpret_cast<unwindstack::LocalUnwinder*>(unwinder_data);
std::vector<unwindstack::LocalFrameData>* frame_info =
reinterpret_cast<std::vector<unwindstack::LocalFrameData>*>(frame_data);
unwinder->Unwind(frame_info, 256);
}
extern "C" void TestlibLevel3(void* unwinder_data, void* frame_data) {
TestlibLevel4(unwinder_data, frame_data);
}
extern "C" void TestlibLevel2(void* unwinder_data, void* frame_data) {
TestlibLevel3(unwinder_data, frame_data);
}
extern "C" void TestlibLevel1(void* unwinder_data, void* frame_data) {
TestlibLevel2(unwinder_data, frame_data);
}
// The loop in this function is only guaranteed to not be optimized away by the compiler
// if optimizations are turned off. This is partially because the compiler doesn't have
// any idea about the function since it is retrieved using dlsym.
//
// In an effort to defend against the compiler:
// 1. The loop iteration variable is volatile.
// 2. A call to this function should be wrapped in TestUtils::DoNotOptimize().
extern "C" int BusyWait() {
for (volatile size_t i = 0; i < 1000000; ++i)
;
return 0;
}
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