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// Copyright 2015 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_NATIVE_STACK_SAMPLER_H_
#define BASE_PROFILER_NATIVE_STACK_SAMPLER_H_
#include <memory>
#include "base/base_export.h"
#include "base/macros.h"
#include "base/profiler/stack_sampling_profiler.h"
#include "base/threading/platform_thread.h"
namespace base {
class NativeStackSamplerTestDelegate;
// NativeStackSampler is an implementation detail of StackSamplingProfiler. It
// abstracts the native implementation required to record a stack sample for a
// given thread.
class NativeStackSampler {
public:
virtual ~NativeStackSampler();
// Creates a stack sampler that records samples for |thread_handle|. Returns
// null if this platform does not support stack sampling.
static std::unique_ptr<NativeStackSampler> Create(
PlatformThreadId thread_id,
NativeStackSamplerTestDelegate* test_delegate);
// The following functions are all called on the SamplingThread (not the
// thread being sampled).
// Notifies the sampler that we're starting to record a new profile. Modules
// shared across samples in the profile should be recorded in |modules|.
virtual void ProfileRecordingStarting(
std::vector<StackSamplingProfiler::Module>* modules) = 0;
// Records a stack sample to |sample|.
virtual void RecordStackSample(StackSamplingProfiler::Sample* sample) = 0;
// Notifies the sampler that we've stopped recording the current
// profile.
virtual void ProfileRecordingStopped() = 0;
protected:
NativeStackSampler();
private:
DISALLOW_COPY_AND_ASSIGN(NativeStackSampler);
};
// NativeStackSamplerTestDelegate provides seams for test code to execute during
// stack collection.
class BASE_EXPORT NativeStackSamplerTestDelegate {
public:
virtual ~NativeStackSamplerTestDelegate();
// Called after copying the stack and resuming the target thread, but prior to
// walking the stack. Invoked on the SamplingThread.
virtual void OnPreStackWalk() = 0;
protected:
NativeStackSamplerTestDelegate();
private:
DISALLOW_COPY_AND_ASSIGN(NativeStackSamplerTestDelegate);
};
} // namespace base
#endif // BASE_PROFILER_NATIVE_STACK_SAMPLER_H_
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