1 // Copyright 2016 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "src/tracing/tracing-category-observer.h"
6 
7 #include "src/flags.h"
8 #include "src/tracing/trace-event.h"
9 #include "src/v8.h"
10 
11 namespace v8 {
12 namespace tracing {
13 
14 TracingCategoryObserver* TracingCategoryObserver::instance_ = nullptr;
15 
16 void TracingCategoryObserver::SetUp() {
17   TracingCategoryObserver::instance_ = new TracingCategoryObserver();
18   v8::internal::V8::GetCurrentPlatform()->AddTraceStateObserver(
19       TracingCategoryObserver::instance_);
20   TRACE_EVENT_WARMUP_CATEGORY(TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats"));
21   TRACE_EVENT_WARMUP_CATEGORY(
22       TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats_sampling"));
23   TRACE_EVENT_WARMUP_CATEGORY(TRACE_DISABLED_BY_DEFAULT("v8.gc_stats"));
24   TRACE_EVENT_WARMUP_CATEGORY(TRACE_DISABLED_BY_DEFAULT("v8.ic_stats"));
25 }
26 
27 void TracingCategoryObserver::TearDown() {
28   v8::internal::V8::GetCurrentPlatform()->RemoveTraceStateObserver(
29       TracingCategoryObserver::instance_);
30   delete TracingCategoryObserver::instance_;
31 }
32 
33 void TracingCategoryObserver::OnTraceEnabled() {
34   bool enabled = false;
35   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
36       TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats"), &enabled);
37   if (enabled) {
38     v8::internal::FLAG_runtime_stats |= ENABLED_BY_TRACING;
39   }
40   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
41       TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats_sampling"), &enabled);
42   if (enabled) {
43     v8::internal::FLAG_runtime_stats |= ENABLED_BY_SAMPLING;
44   }
45   TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT("v8.gc_stats"),
46                                      &enabled);
47   if (enabled) {
48     v8::internal::FLAG_gc_stats |= ENABLED_BY_TRACING;
49   }
50   TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT("v8.ic_stats"),
51                                      &enabled);
52   if (enabled) {
53     v8::internal::FLAG_ic_stats |= ENABLED_BY_TRACING;
54   }
55 }
56 
57 void TracingCategoryObserver::OnTraceDisabled() {
58   v8::internal::FLAG_runtime_stats &=
59       ~(ENABLED_BY_TRACING | ENABLED_BY_SAMPLING);
60   v8::internal::FLAG_gc_stats &= ~ENABLED_BY_TRACING;
61   v8::internal::FLAG_ic_stats &= ~ENABLED_BY_TRACING;
62 }
63 
64 }  // namespace tracing
65 }  // namespace v8
66