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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/profiler/tracing-cpu-profiler.h"
#include "src/execution/isolate.h"
#include "src/init/v8.h"
#include "src/profiler/cpu-profiler.h"
#include "src/tracing/trace-event.h"
namespace v8 {
namespace internal {
TracingCpuProfilerImpl::TracingCpuProfilerImpl(Isolate* isolate)
: isolate_(isolate), profiling_enabled_(false) {
#if defined(V8_USE_PERFETTO)
TrackEvent::AddSessionObserver(this);
// Fire the observer if tracing is already in progress.
if (TrackEvent::IsEnabled()) OnStart({});
#else
V8::GetCurrentPlatform()->GetTracingController()->AddTraceStateObserver(this);
#endif
}
TracingCpuProfilerImpl::~TracingCpuProfilerImpl() {
StopProfiling();
#if defined(V8_USE_PERFETTO)
TrackEvent::RemoveSessionObserver(this);
#else
V8::GetCurrentPlatform()->GetTracingController()->RemoveTraceStateObserver(
this);
#endif
}
#if defined(V8_USE_PERFETTO)
void TracingCpuProfilerImpl::OnStart(
const perfetto::DataSourceBase::StartArgs&) {
#else
void TracingCpuProfilerImpl::OnTraceEnabled() {
#endif
bool enabled;
TRACE_EVENT_CATEGORY_GROUP_ENABLED(
TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler"), &enabled);
if (!enabled) return;
profiling_enabled_ = true;
isolate_->RequestInterrupt(
[](v8::Isolate*, void* data) {
reinterpret_cast<TracingCpuProfilerImpl*>(data)->StartProfiling();
},
this);
}
#if defined(V8_USE_PERFETTO)
void TracingCpuProfilerImpl::OnStop(const perfetto::DataSourceBase::StopArgs&) {
#else
void TracingCpuProfilerImpl::OnTraceDisabled() {
#endif
base::MutexGuard lock(&mutex_);
if (!profiling_enabled_) return;
profiling_enabled_ = false;
isolate_->RequestInterrupt(
[](v8::Isolate*, void* data) {
reinterpret_cast<TracingCpuProfilerImpl*>(data)->StopProfiling();
},
this);
}
void TracingCpuProfilerImpl::StartProfiling() {
base::MutexGuard lock(&mutex_);
if (!profiling_enabled_ || profiler_) return;
int sampling_interval_us = 100;
profiler_.reset(new CpuProfiler(isolate_, kDebugNaming));
profiler_->set_sampling_interval(
base::TimeDelta::FromMicroseconds(sampling_interval_us));
profiler_->StartProfiling("", {kLeafNodeLineNumbers});
}
void TracingCpuProfilerImpl::StopProfiling() {
base::MutexGuard lock(&mutex_);
if (!profiler_) return;
profiler_->StopProfiling("");
profiler_.reset();
}
} // namespace internal
} // namespace v8
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