void V8GCController::gcPrologue(v8::GCType type, v8::GCCallbackFlags flags)
{
// FIXME: It would be nice if the GC callbacks passed the Isolate directly....
v8::Isolate* isolate = v8::Isolate::GetCurrent();
TRACE_EVENT_BEGIN1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "GCEvent", "usedHeapSizeBefore", usedHeapSize(isolate));
if (type == v8::kGCTypeScavenge)
minorGCPrologue(isolate);
else if (type == v8::kGCTypeMarkSweepCompact)
majorGCPrologue(isolate, flags & v8::kGCCallbackFlagConstructRetainedObjectInfos);
}
void V8GCController::gcPrologue(v8::Isolate* isolate, v8::GCType type, v8::GCCallbackFlags flags)
{
if (isMainThread())
ScriptForbiddenScope::enter();
// TODO(haraken): A GC callback is not allowed to re-enter V8. This means
// that it's unsafe to run Oilpan's GC in the GC callback because it may
// run finalizers that call into V8. To avoid the risk, we should post
// a task to schedule the Oilpan's GC.
// (In practice, there is no finalizer that calls into V8 and thus is safe.)
v8::HandleScope scope(isolate);
switch (type) {
case v8::kGCTypeScavenge:
if (ThreadState::current())
ThreadState::current()->willStartV8GC(BlinkGC::V8MinorGC);
TRACE_EVENT_BEGIN1("devtools.timeline,v8", "MinorGC", "usedHeapSizeBefore", usedHeapSize(isolate));
visitWeakHandlesForMinorGC(isolate);
break;
case v8::kGCTypeMarkSweepCompact:
if (ThreadState::current())
ThreadState::current()->willStartV8GC(BlinkGC::V8MajorGC);
TRACE_EVENT_BEGIN2("devtools.timeline,v8", "MajorGC", "usedHeapSizeBefore", usedHeapSize(isolate), "type", "atomic pause");
gcPrologueForMajorGC(isolate, flags & v8::kGCCallbackFlagConstructRetainedObjectInfos);
break;
case v8::kGCTypeIncrementalMarking:
if (ThreadState::current())
ThreadState::current()->willStartV8GC(BlinkGC::V8MajorGC);
TRACE_EVENT_BEGIN2("devtools.timeline,v8", "MajorGC", "usedHeapSizeBefore", usedHeapSize(isolate), "type", "incremental marking");
gcPrologueForMajorGC(isolate, flags & v8::kGCCallbackFlagConstructRetainedObjectInfos);
break;
case v8::kGCTypeProcessWeakCallbacks:
TRACE_EVENT_BEGIN2("devtools.timeline,v8", "MajorGC", "usedHeapSizeBefore", usedHeapSize(isolate), "type", "weak processing");
break;
default:
ASSERT_NOT_REACHED();
}
}
void WebDevToolsAgentImpl::willComposite()
{
TRACE_EVENT_BEGIN1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "CompositeLayers", "layerTreeId", m_layerTreeId);
if (InspectorController* ic = inspectorController())
ic->willComposite();
}
