void V8GCController::gcEpilogue(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();
if (type == v8::kGCTypeScavenge)
minorGCEpilogue(isolate);
else if (type == v8::kGCTypeMarkSweepCompact)
majorGCEpilogue(isolate);
// Forces a Blink heap garbage collection when a garbage collection
// was forced from V8. This is used for tests that force GCs from
// JavaScript to verify that objects die when expected.
if (flags & v8::kGCCallbackFlagForced) {
// This single GC is not enough for two reasons:
// (1) The GC is not precise because the GC scans on-stack pointers conservatively.
// (2) One GC is not enough to break a chain of persistent handles. It's possible that
// some heap allocated objects own objects that contain persistent handles
// pointing to other heap allocated objects. To break the chain, we need multiple GCs.
//
// Regarding (1), we force a precise GC at the end of the current event loop. So if you want
// to collect all garbage, you need to wait until the next event loop.
// Regarding (2), it would be OK in practice to trigger only one GC per gcEpilogue, because
// GCController.collectAll() forces 7 V8's GC.
Heap::collectGarbage(ThreadState::HeapPointersOnStack, ThreadState::ForcedGC);
// Forces a precise GC at the end of the current event loop.
Heap::setForcePreciseGCForTesting();
}
TRACE_EVENT_END1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "GCEvent", "usedHeapSizeAfter", usedHeapSize(isolate));
TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "UpdateCounters", "data", InspectorUpdateCountersEvent::data());
}
void V8GCController::gcEpilogue(v8::GCType type, v8::GCCallbackFlags flags)
{
if (type == v8::kGCTypeScavenge)
minorGCEpilogue();
else if (type == v8::kGCTypeMarkSweepCompact)
majorGCEpilogue();
}