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// 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/profiler/frame.h"
#include "base/profiler/register_context.h"
#include "base/profiler/stack_sampler.h"
namespace base {
class ThreadDelegate;
class Unwinder;
// Cross-platform stack sampler implementation. Delegates to ThreadDelegate for
// platform-specific implementation.
class BASE_EXPORT StackSamplerImpl : public StackSampler {
public:
StackSamplerImpl(std::unique_ptr<ThreadDelegate> delegate,
std::unique_ptr<Unwinder> native_unwinder,
ModuleCache* module_cache,
StackSamplerTestDelegate* test_delegate = nullptr);
~StackSamplerImpl() override;
StackSamplerImpl(const StackSamplerImpl&) = delete;
StackSamplerImpl& operator=(const StackSamplerImpl&) = delete;
// StackSampler:
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,
Unwinder* native_unwinder,
Unwinder* aux_unwinder);
private:
bool CopyStack(StackBuffer* stack_buffer,
uintptr_t* stack_top,
ProfileBuilder* profile_builder,
RegisterContext* thread_context);
static std::vector<Frame> WalkStack(ModuleCache* module_cache,
RegisterContext* thread_context,
uintptr_t stack_top,
Unwinder* native_unwinder,
Unwinder* aux_unwinder);
const std::unique_ptr<ThreadDelegate> thread_delegate_;
const std::unique_ptr<Unwinder> native_unwinder_;
std::unique_ptr<Unwinder> aux_unwinder_;
ModuleCache* const module_cache_;
StackSamplerTestDelegate* const test_delegate_;
};
} // namespace base
#endif // BASE_PROFILER_STACK_SAMPLER_IMPL_H_