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98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_PROFILER_NATIVE_STACK_SAMPLER_H_
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#define BASE_PROFILER_NATIVE_STACK_SAMPLER_H_
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#include <memory>
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#include "base/base_export.h"
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#include "base/macros.h"
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#include "base/profiler/stack_sampling_profiler.h"
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#include "base/threading/platform_thread.h"
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namespace base {
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class NativeStackSamplerTestDelegate;
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// NativeStackSampler is an implementation detail of StackSamplingProfiler. It
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// abstracts the native implementation required to record a set of stack frames
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// for a given thread.
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class NativeStackSampler {
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public:
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// This class contains a buffer for stack copies that can be shared across
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// multiple instances of NativeStackSampler.
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class StackBuffer {
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public:
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StackBuffer(size_t buffer_size);
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~StackBuffer();
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void* buffer() const { return buffer_.get(); }
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size_t size() const { return size_; }
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private:
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// The word-aligned buffer.
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const std::unique_ptr<uintptr_t[]> buffer_;
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// The size of the buffer.
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const size_t size_;
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DISALLOW_COPY_AND_ASSIGN(StackBuffer);
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};
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virtual ~NativeStackSampler();
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// Creates a stack sampler that records samples for thread with |thread_id|.
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// Returns null if this platform does not support stack sampling.
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static std::unique_ptr<NativeStackSampler> Create(
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PlatformThreadId thread_id,
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NativeStackSamplerTestDelegate* test_delegate);
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// Gets the required size of the stack buffer.
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static size_t GetStackBufferSize();
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// Creates an instance of the a stack buffer that can be used for calls to
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// any NativeStackSampler object.
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static std::unique_ptr<StackBuffer> CreateStackBuffer();
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// The following functions are all called on the SamplingThread (not the
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// thread being sampled).
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// Notifies the sampler that we're starting to record a new profile.
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virtual void ProfileRecordingStarting() = 0;
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// Records a set of internal frames and returns them.
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virtual std::vector<StackSamplingProfiler::InternalFrame> RecordStackFrames(
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StackBuffer* stackbuffer,
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StackSamplingProfiler::ProfileBuilder* profile_builder) = 0;
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protected:
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NativeStackSampler();
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private:
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DISALLOW_COPY_AND_ASSIGN(NativeStackSampler);
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};
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// NativeStackSamplerTestDelegate provides seams for test code to execute during
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// stack collection.
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class BASE_EXPORT NativeStackSamplerTestDelegate {
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public:
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virtual ~NativeStackSamplerTestDelegate();
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// Called after copying the stack and resuming the target thread, but prior to
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// walking the stack. Invoked on the SamplingThread.
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virtual void OnPreStackWalk() = 0;
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protected:
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NativeStackSamplerTestDelegate();
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private:
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DISALLOW_COPY_AND_ASSIGN(NativeStackSamplerTestDelegate);
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};
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} // namespace base
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#endif // BASE_PROFILER_NATIVE_STACK_SAMPLER_H_
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