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80 lines
2.0 KiB
80 lines
2.0 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_BACKTRACE_HELPER_H_
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#define ART_RUNTIME_BACKTRACE_HELPER_H_
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#include <stddef.h>
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#include <stdint.h>
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namespace unwindstack {
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class Unwinder;
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}
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namespace art {
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// Using libbacktrace
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class BacktraceCollector {
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public:
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BacktraceCollector(uintptr_t* out_frames, size_t max_depth, size_t skip_count)
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: out_frames_(out_frames), max_depth_(max_depth), skip_count_(skip_count) {}
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size_t NumFrames() const {
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return num_frames_;
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}
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// Collect the backtrace, do not call more than once.
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void Collect();
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private:
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// Try to collect backtrace. Returns false on failure.
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// It is used to retry backtrace on temporary failure.
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bool CollectImpl(unwindstack::Unwinder* unwinder);
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uintptr_t* const out_frames_ = nullptr;
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size_t num_frames_ = 0u;
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const size_t max_depth_ = 0u;
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size_t skip_count_ = 0u;
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};
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// A bounded sized backtrace.
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template <size_t kMaxFrames>
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class FixedSizeBacktrace {
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public:
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void Collect(size_t skip_count) {
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BacktraceCollector collector(frames_, kMaxFrames, skip_count);
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collector.Collect();
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num_frames_ = collector.NumFrames();
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}
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uint64_t Hash() const {
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uint64_t hash = 9314237;
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for (size_t i = 0; i < num_frames_; ++i) {
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hash = hash * 2654435761 + frames_[i];
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hash += (hash >> 13) ^ (hash << 6);
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}
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return hash;
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}
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private:
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uintptr_t frames_[kMaxFrames];
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size_t num_frames_;
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};
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} // namespace art
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#endif // ART_RUNTIME_BACKTRACE_HELPER_H_
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