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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/tracing/tracing-category-observer.h"
#include "src/flags.h"
#include "src/tracing/trace-event.h"
#include "src/v8.h"
namespace v8 {
namespace tracing {
TracingCategoryObserver* TracingCategoryObserver::instance_ = nullptr;
void TracingCategoryObserver::SetUp() {
TracingCategoryObserver::instance_ = new TracingCategoryObserver();
v8::internal::V8::GetCurrentPlatform()->AddTraceStateObserver(
TracingCategoryObserver::instance_);
TRACE_EVENT_WARMUP_CATEGORY(TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats"));
TRACE_EVENT_WARMUP_CATEGORY(
TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats_sampling"));
TRACE_EVENT_WARMUP_CATEGORY(TRACE_DISABLED_BY_DEFAULT("v8.gc_stats"));
}
void TracingCategoryObserver::TearDown() {
v8::internal::V8::GetCurrentPlatform()->RemoveTraceStateObserver(
TracingCategoryObserver::instance_);
delete TracingCategoryObserver::instance_;
}
void TracingCategoryObserver::OnTraceEnabled() {
bool enabled = false;
TRACE_EVENT_CATEGORY_GROUP_ENABLED(
TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats"), &enabled);
if (enabled) {
v8::internal::FLAG_runtime_stats |= ENABLED_BY_TRACING;
}
TRACE_EVENT_CATEGORY_GROUP_ENABLED(
TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats_sampling"), &enabled);
if (enabled) {
v8::internal::FLAG_runtime_stats |= ENABLED_BY_SAMPLING;
}
TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT("v8.gc_stats"),
&enabled);
if (enabled) {
v8::internal::FLAG_gc_stats |= ENABLED_BY_TRACING;
}
}
void TracingCategoryObserver::OnTraceDisabled() {
v8::internal::FLAG_runtime_stats &=
~(ENABLED_BY_TRACING | ENABLED_BY_SAMPLING);
v8::internal::FLAG_gc_stats &= ~ENABLED_BY_TRACING;
}
} // namespace tracing
} // namespace v8
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