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/*
* Copyright (C) 2021 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 <cstddef>
#include <cstdint>
#include <memory>
#include <sstream>
#include <benchmark/benchmark.h>
#include <unwindstack/Arch.h>
#include <unwindstack/Unwinder.h>
#include "Utils.h"
#include "utils/OfflineUnwindUtils.h"
// This collection of benchmarks exercises Unwinder::Unwind for offline unwinds.
//
// See `libunwindstack/utils/OfflineUnwindUtils.h` for more info on offline unwinds
// and b/192012600 for additional information regarding these benchmarks.
namespace unwindstack {
namespace {
class OfflineUnwindBenchmark : public benchmark::Fixture {
public:
void TearDown(benchmark::State& state) override {
offline_utils_.ReturnToCurrentWorkingDirectory();
mem_tracker_.SetBenchmarkCounters(state);
}
void RunBenchmark(benchmark::State& state, const std::string& offline_files_dir,
size_t expected_num_frames, ArchEnum arch, bool cache_maps, bool is_jit_debug) {
std::string error_msg;
if (!offline_utils_.Init(offline_files_dir, arch, error_msg, /*add_stack=*/true, cache_maps)) {
state.SkipWithError(error_msg.c_str());
return;
}
if (is_jit_debug && !offline_utils_.SetJitProcessMemory(error_msg)) {
state.SkipWithError(error_msg.c_str());
return;
}
std::unique_ptr<JitDebug> jit_debug;
std::stringstream err_stream;
Unwinder unwinder(0, nullptr, nullptr);
for (auto _ : state) {
state.PauseTiming();
// Need to init unwinder with new copy of regs each iteration because unwinding changes
// the attributes of the regs object.
std::unique_ptr<Regs> regs_copy(offline_utils_.GetRegs()->Clone());
// If we don't want to use cached maps, make sure to reset them.
if (!cache_maps && !offline_utils_.ResetMaps(error_msg)) {
state.SkipWithError(error_msg.c_str());
return;
}
mem_tracker_.StartTrackingAllocations();
state.ResumeTiming();
std::shared_ptr<Memory> process_memory = offline_utils_.GetProcessMemory();
unwinder = Unwinder(128, offline_utils_.GetMaps(), regs_copy.get(), process_memory);
if (is_jit_debug) {
jit_debug = CreateJitDebug(regs_copy->Arch(), process_memory);
unwinder.SetJitDebug(jit_debug.get());
}
unwinder.Unwind();
state.PauseTiming();
mem_tracker_.StopTrackingAllocations();
if (unwinder.NumFrames() != expected_num_frames) {
err_stream << "Failed to unwind properly.Expected " << expected_num_frames
<< " frames, but unwinder contained " << unwinder.NumFrames() << " frames.\n";
break;
}
state.ResumeTiming();
}
}
protected:
MemoryTracker mem_tracker_;
OfflineUnwindUtils offline_utils_;
};
BENCHMARK_F(OfflineUnwindBenchmark, BM_offline_straddle_arm64)(benchmark::State& state) {
RunBenchmark(state, "straddle_arm64/", /*expected_num_frames=*/6, ARCH_ARM64,
/*cached_maps=*/false, /*is_jit_debug=*/false);
}
BENCHMARK_F(OfflineUnwindBenchmark, BM_offline_straddle_arm64_cached_maps)
(benchmark::State& state) {
RunBenchmark(state, "straddle_arm64/", /*expected_num_frames=*/6, ARCH_ARM64,
/*cached_maps=*/true, /*is_jit_debug=*/false);
}
BENCHMARK_F(OfflineUnwindBenchmark, BM_offline_jit_debug_x86)(benchmark::State& state) {
RunBenchmark(state, "jit_debug_x86/", /*expected_num_frames=*/69, ARCH_X86,
/*cached_maps=*/false, /*is_jit_debug=*/true);
}
} // namespace
} // namespace unwindstack
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