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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/profiler/cpu-profiler.h"
#include "src/tracing/trace-event.h"
#include "src/v8.h"
#define PROFILER_TRACE_CATEGORY_ENABLED(cat) \
(*TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT(cat)))
namespace v8 {
std::unique_ptr<TracingCpuProfiler> TracingCpuProfiler::Create(
v8::Isolate* isolate) {
return std::unique_ptr<TracingCpuProfiler>(
new internal::TracingCpuProfilerImpl(
reinterpret_cast<internal::Isolate*>(isolate)));
}
namespace internal {
TracingCpuProfilerImpl::TracingCpuProfilerImpl(Isolate* isolate)
: isolate_(isolate), profiling_enabled_(false) {
// Make sure tracing system notices profiler categories.
PROFILER_TRACE_CATEGORY_ENABLED("v8.cpu_profiler");
PROFILER_TRACE_CATEGORY_ENABLED("v8.cpu_profiler.hires");
V8::GetCurrentPlatform()->AddTraceStateObserver(this);
}
TracingCpuProfilerImpl::~TracingCpuProfilerImpl() {
StopProfiling();
V8::GetCurrentPlatform()->RemoveTraceStateObserver(this);
}
void TracingCpuProfilerImpl::OnTraceEnabled() {
if (!PROFILER_TRACE_CATEGORY_ENABLED("v8.cpu_profiler")) return;
profiling_enabled_ = true;
isolate_->RequestInterrupt(
[](v8::Isolate*, void* data) {
reinterpret_cast<TracingCpuProfilerImpl*>(data)->StartProfiling();
},
this);
}
void TracingCpuProfilerImpl::OnTraceDisabled() {
base::LockGuard<base::Mutex> 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::LockGuard<base::Mutex> lock(&mutex_);
if (!profiling_enabled_ || profiler_) return;
int sampling_interval_us =
PROFILER_TRACE_CATEGORY_ENABLED("v8.cpu_profiler.hires") ? 100 : 1000;
profiler_.reset(new CpuProfiler(isolate_));
profiler_->set_sampling_interval(
base::TimeDelta::FromMicroseconds(sampling_interval_us));
profiler_->StartProfiling("", true);
}
void TracingCpuProfilerImpl::StopProfiling() {
base::LockGuard<base::Mutex> lock(&mutex_);
if (!profiler_) return;
profiler_->StopProfiling("");
profiler_.reset();
}
} // namespace internal
} // namespace v8
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