Introduce infrastructure for tracing ScriptWrappables.

third_party/WebKit/Source/bindings/core/v8/V8GCController.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "bindings/core/v8/V8GCController.h"
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/RetainedDOMInfo.h"
+#include "bindings/core/v8/ScriptWrappableVisitor.h"
 #include "bindings/core/v8/V8AbstractEventListener.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8MutationObserver.h"
 #include "bindings/core/v8/V8Node.h"
 #include "bindings/core/v8/V8ScriptRunner.h"
 #include "bindings/core/v8/WrapperTypeInfo.h"
 #include "core/dom/Attr.h"
 #include "core/dom/Document.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/TemplateContentDocumentFragment.h"
@@ skipping 116 matching lines @@
         if (classId != WrapperTypeInfo::NodeClassId && classId != WrapperTypeInfo::ObjectClassId)
             return;
 
         v8::Local<v8::Object> wrapper = v8::Local<v8::Object>::New(m_isolate, v8::Persistent<v8::Object>::Cast(*value));
         ASSERT(V8DOMWrapper::hasInternalFieldsSet(wrapper));
 
         const WrapperTypeInfo* type = toWrapperTypeInfo(wrapper);
         if (type->hasPendingActivity(wrapper)) {
             // If you hit this assert, you'll need to add a [DependentiLifetime]
             // extended attribute to the DOM interface. A DOM interface that
-            // overrides hasPendingActivity must be marked as [DependentiLifetime].
+            // overrides hasPendingActivity must be marked as [DependentLifetime].
             RELEASE_ASSERT(!value->IsIndependent());
             m_isolate->SetObjectGroupId(*value, liveRootId());
             ++m_domObjectsWithPendingActivity;
         }
 
         if (value->IsIndependent())
             return;
 
         if (classId == WrapperTypeInfo::NodeClassId) {
             ASSERT(V8Node::hasInstance(wrapper, m_isolate));
@@ skipping 70 matching lines @@
 
 void objectGroupingForMajorGC(v8::Isolate* isolate, bool constructRetainedObjectInfos)
 {
     MajorGCWrapperVisitor visitor(isolate, constructRetainedObjectInfos);
     isolate->VisitHandlesWithClassIds(&visitor);
     visitor.notifyFinished();
 }
 
 void gcPrologueForMajorGC(v8::Isolate* isolate, bool constructRetainedObjectInfos)
 {
+    if (RuntimeEnabledFeatures::traceWrappablesEnabled())
+        return;
+
     objectGroupingForMajorGC(isolate, constructRetainedObjectInfos);
 }
 
 } // namespace
 
 void V8GCController::gcPrologue(v8::Isolate* isolate, v8::GCType type, v8::GCCallbackFlags flags)
 {
     if (isMainThread())
         ScriptForbiddenScope::enter();
 
@@ skipping 208 matching lines @@
     DEFINE_THREAD_SAFE_STATIC_LOCAL(CustomCountHistogram, scanPendingActivityHistogram, new CustomCountHistogram("Blink.ScanPendingActivityDuration", 1, 1000, 50));
     double startTime = WTF::currentTimeMS();
     v8::HandleScope scope(isolate);
     PendingActivityVisitor visitor(isolate, executionContext);
     toIsolate(executionContext)->VisitHandlesWithClassIds(&visitor);
     scanPendingActivityHistogram.count(static_cast<int>(WTF::currentTimeMS() - startTime));
     return visitor.pendingActivityFound();
 }
 
 } // namespace blink