content/shell/renderer/layout_test/gc_controller.cc

   1 // Copyright 2014 The Chromium 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 "content/shell/renderer/layout_test/gc_controller.h"
   6
   7 #include "gin/arguments.h"
   8 #include "gin/handle.h"
   9 #include "gin/object_template_builder.h"
  10 #include "third_party/WebKit/public/web/WebFrame.h"
  11 #include "third_party/WebKit/public/web/WebKit.h"
  12 #include "v8/include/v8.h"
  13
  14 namespace content {
  15
  16 gin::WrapperInfo GCController::kWrapperInfo = {gin::kEmbedderNativeGin};
  17
  18 // static
  19 void GCController::Install(blink::WebFrame* frame) {
  20   v8::Isolate* isolate = blink::mainThreadIsolate();
  21   v8::HandleScope handle_scope(isolate);
  22   v8::Local<v8::Context> context = frame->mainWorldScriptContext();
  23   if (context.IsEmpty())
  24     return;
  25
  26   v8::Context::Scope context_scope(context);
  27
  28   gin::Handle<GCController> controller =
  29       gin::CreateHandle(isolate, new GCController());
  30   if (controller.IsEmpty())
  31     return;
  32   v8::Local<v8::Object> global = context->Global();
  33   global->Set(gin::StringToV8(isolate, "GCController"), controller.ToV8());
  34 }
  35
  36 GCController::GCController() {}
  37
  38 GCController::~GCController() {}
  39
  40 gin::ObjectTemplateBuilder GCController::GetObjectTemplateBuilder(
  41     v8::Isolate* isolate) {
  42   return gin::Wrappable<GCController>::GetObjectTemplateBuilder(isolate)
  43       .SetMethod("collect", &GCController::Collect)
  44       .SetMethod("collectAll", &GCController::CollectAll)
  45       .SetMethod("minorCollect", &GCController::MinorCollect);
  46 }
  47
  48 void GCController::Collect(const gin::Arguments& args) {
  49   args.isolate()->RequestGarbageCollectionForTesting(
  50       v8::Isolate::kFullGarbageCollection);
  51 }
  52
  53 void GCController::CollectAll(const gin::Arguments& args) {
  54   // In order to collect a DOM wrapper, two GC cycles are needed.
  55   // In the first GC cycle, a weak callback of the DOM wrapper is called back
  56   // and the weak callback disposes a persistent handle to the DOM wrapper.
  57   // In the second GC cycle, the DOM wrapper is reclaimed.
  58   // Given that two GC cycles are needed to collect one DOM wrapper,
  59   // more than two GC cycles are needed to collect all DOM wrappers
  60   // that are chained. Seven GC cycles look enough in most tests.
  61   for (int i = 0; i < 7; i++) {
  62     args.isolate()->RequestGarbageCollectionForTesting(
  63         v8::Isolate::kFullGarbageCollection);
  64   }
  65 }
  66
  67 void GCController::MinorCollect(const gin::Arguments& args) {
  68   args.isolate()->RequestGarbageCollectionForTesting(
  69       v8::Isolate::kMinorGarbageCollection);
  70 }
  71
  72 }  // namespace content