chromium/services/tracing/public/cpp/stack_sampling/tracing_sampler_profiler.h

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SERVICES_TRACING_PUBLIC_CPP_STACK_SAMPLING_TRACING_SAMPLER_PROFILER_H_
#define SERVICES_TRACING_PUBLIC_CPP_STACK_SAMPLING_TRACING_SAMPLER_PROFILER_H_

#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "base/component_export.h"
#include "base/debug/debugging_buildflags.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/profiler/sampling_profiler_thread_token.h"
#include "base/profiler/stack_sampling_profiler.h"
#include "base/profiler/unwinder.h"
#include "base/sequence_checker.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "services/tracing/public/cpp/buildflags.h"
#include "services/tracing/public/cpp/perfetto/interning_index.h"
#include "third_party/perfetto/include/perfetto/ext/tracing/core/trace_writer.h"

#if BUILDFLAG(IS_ANDROID) && defined(ARCH_CPU_ARM64) && \
    BUILDFLAG(CAN_UNWIND_WITH_FRAME_POINTERS)
#define ANDROID_ARM64_UNWINDING_SUPPORTED …
#else
#define ANDROID_ARM64_UNWINDING_SUPPORTED …
#endif

#if BUILDFLAG(IS_ANDROID) && BUILDFLAG(CAN_UNWIND_WITH_CFI_TABLE) && \
    defined(OFFICIAL_BUILD)
#define ANDROID_CFI_UNWINDING_SUPPORTED …
#else
#define ANDROID_CFI_UNWINDING_SUPPORTED …
#endif

namespace tracing {

class PerfettoProducer;

#if BUILDFLAG(ENABLE_LOADER_LOCK_SAMPLING)
class LoaderLockSamplingThread;
#endif

// This class is a bridge between the base stack sampling profiler and chrome
// tracing. It's listening to TraceLog enabled/disabled events and it's starting
// a stack profiler on the current thread if needed. The sampling profiler is
// lazily instantiated when tracing is activated and released when tracing is
// disabled.
//
// The TracingSamplerProfiler must be created and destroyed on the sampled
// thread. The tracelog observers can be called on any thread which force the
// field |profiler_| to be thread-safe.
class COMPONENT_EXPORT(TRACING_CPP) TracingSamplerProfiler { … };

}  // namespace tracing

#endif  // SERVICES_TRACING_PUBLIC_CPP_STACK_SAMPLING_TRACING_SAMPLER_PROFILER_H_