| // Copyright 2019 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_PROFILER_STACK_SAMPLER_IMPL_H_ |
| #define BASE_PROFILER_STACK_SAMPLER_IMPL_H_ |
| |
| #include <memory> |
| |
| #include "base/base_export.h" |
| #include "base/callback.h" |
| #include "base/containers/circular_deque.h" |
| #include "base/profiler/frame.h" |
| #include "base/profiler/register_context.h" |
| #include "base/profiler/stack_copier.h" |
| #include "base/profiler/stack_sampler.h" |
| |
| namespace base { |
| |
| class Unwinder; |
| |
| // Cross-platform stack sampler implementation. Delegates to StackCopier for the |
| // platform-specific stack copying implementation. |
| class BASE_EXPORT StackSamplerImpl : public StackSampler { |
| public: |
| StackSamplerImpl(std::unique_ptr<StackCopier> stack_copier, |
| UnwindersFactory core_unwinders_factory, |
| ModuleCache* module_cache, |
| RepeatingClosure record_sample_callback = RepeatingClosure(), |
| StackSamplerTestDelegate* test_delegate = nullptr); |
| ~StackSamplerImpl() override; |
| |
| StackSamplerImpl(const StackSamplerImpl&) = delete; |
| StackSamplerImpl& operator=(const StackSamplerImpl&) = delete; |
| |
| // StackSampler: |
| void Initialize() override; |
| void AddAuxUnwinder(std::unique_ptr<Unwinder> unwinder) override; |
| void RecordStackFrames(StackBuffer* stack_buffer, |
| ProfileBuilder* profile_builder) override; |
| |
| // Exposes the internal function for unit testing. |
| static std::vector<Frame> WalkStackForTesting( |
| ModuleCache* module_cache, |
| RegisterContext* thread_context, |
| uintptr_t stack_top, |
| const base::circular_deque<std::unique_ptr<Unwinder>>& unwinders); |
| |
| private: |
| static std::vector<Frame> WalkStack( |
| ModuleCache* module_cache, |
| RegisterContext* thread_context, |
| uintptr_t stack_top, |
| const base::circular_deque<std::unique_ptr<Unwinder>>& unwinders); |
| |
| const std::unique_ptr<StackCopier> stack_copier_; |
| UnwindersFactory unwinders_factory_; |
| |
| // Unwinders are stored in decreasing priority order. |
| base::circular_deque<std::unique_ptr<Unwinder>> unwinders_; |
| |
| ModuleCache* const module_cache_; |
| const RepeatingClosure record_sample_callback_; |
| StackSamplerTestDelegate* const test_delegate_; |
| |
| // True if ownership of the object has been passed to the profiling thread and |
| // initialization has occurred there. If that's the case then any further aux |
| // unwinder that's provided needs to be set up within AddAuxUnwinder(). |
| bool was_initialized_ = false; |
| }; |
| |
| } // namespace base |
| |
| #endif // BASE_PROFILER_STACK_SAMPLER_IMPL_H_ |