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// Copyright 2014 The Chromium 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 "components/test_runner/gc_controller.h"
#include "gin/arguments.h"
#include "gin/handle.h"
#include "gin/object_template_builder.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebKit.h"
#include "v8/include/v8.h"
namespace test_runner {
gin::WrapperInfo GCController::kWrapperInfo = {gin::kEmbedderNativeGin};
// static
void GCController::Install(blink::WebFrame* frame) {
v8::Isolate* isolate = blink::mainThreadIsolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> context = frame->mainWorldScriptContext();
if (context.IsEmpty())
v8::Context::Scope context_scope(context);
gin::Handle<GCController> controller =
gin::CreateHandle(isolate, new GCController());
if (controller.IsEmpty())
v8::Local<v8::Object> global = context->Global();
global->Set(gin::StringToV8(isolate, "GCController"), controller.ToV8());
GCController::GCController() {}
GCController::~GCController() {}
gin::ObjectTemplateBuilder GCController::GetObjectTemplateBuilder(
v8::Isolate* isolate) {
return gin::Wrappable<GCController>::GetObjectTemplateBuilder(isolate)
.SetMethod("collect", &GCController::Collect)
.SetMethod("collectAll", &GCController::CollectAll)
.SetMethod("minorCollect", &GCController::MinorCollect);
void GCController::Collect(const gin::Arguments& args) {
void GCController::CollectAll(const gin::Arguments& args) {
// In order to collect a DOM wrapper, two GC cycles are needed.
// In the first GC cycle, a weak callback of the DOM wrapper is called back
// and the weak callback disposes a persistent handle to the DOM wrapper.
// In the second GC cycle, the DOM wrapper is reclaimed.
// Given that two GC cycles are needed to collect one DOM wrapper,
// more than two GC cycles are needed to collect all DOM wrappers
// that are chained. Seven GC cycles look enough in most tests.
for (int i = 0; i < 7; i++) {
void GCController::MinorCollect(const gin::Arguments& args) {
} // namespace test_runner