NS_CYCLE_COLLECTION_CLASSNAME(nsXPCWrappedJS)::Traverse
(void *p, nsCycleCollectionTraversalCallback &cb)
{
nsISupports *s = static_cast<nsISupports*>(p);
NS_ASSERTION(CheckForRightISupports(s),
"not the nsISupports pointer we expect");
nsXPCWrappedJS *tmp = Downcast(s);
nsrefcnt refcnt = tmp->mRefCnt.get();
if (cb.WantDebugInfo()) {
char name[72];
if (tmp->GetClass())
JS_snprintf(name, sizeof(name), "nsXPCWrappedJS (%s)",
tmp->GetClass()->GetInterfaceName());
else
JS_snprintf(name, sizeof(name), "nsXPCWrappedJS");
cb.DescribeRefCountedNode(refcnt, sizeof(nsXPCWrappedJS), name);
} else {
NS_IMPL_CYCLE_COLLECTION_DESCRIBE(nsXPCWrappedJS, refcnt)
}
// nsXPCWrappedJS keeps its own refcount artificially at or above 1, see the
// comment above nsXPCWrappedJS::AddRef.
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "self");
cb.NoteXPCOMChild(s);
if (refcnt > 1) {
// nsXPCWrappedJS roots its mJSObj when its refcount is > 1, see
// the comment above nsXPCWrappedJS::AddRef.
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mJSObj");
cb.NoteScriptChild(nsIProgrammingLanguage::JAVASCRIPT,
tmp->GetJSObjectPreserveColor());
}
nsXPCWrappedJS* root = tmp->GetRootWrapper();
if (root == tmp) {
// The root wrapper keeps the aggregated native object alive.
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "aggregated native");
cb.NoteXPCOMChild(tmp->GetAggregatedNativeObject());
} else {
// Non-root wrappers keep their root alive.
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "root");
cb.NoteXPCOMChild(static_cast<nsIXPConnectWrappedJS*>(root));
}
return NS_OK;
}
NS_CYCLE_COLLECTION_CLASSNAME(nsXPCWrappedJS)::Traverse
(void *p, nsCycleCollectionTraversalCallback &cb)
{
nsISupports *s = static_cast<nsISupports*>(p);
MOZ_ASSERT(CheckForRightISupports(s), "not the nsISupports pointer we expect");
nsXPCWrappedJS *tmp = Downcast(s);
nsrefcnt refcnt = tmp->mRefCnt.get();
if (cb.WantDebugInfo()) {
char name[72];
if (tmp->GetClass())
JS_snprintf(name, sizeof(name), "nsXPCWrappedJS (%s)",
tmp->GetClass()->GetInterfaceName());
else
JS_snprintf(name, sizeof(name), "nsXPCWrappedJS");
cb.DescribeRefCountedNode(refcnt, name);
} else {
NS_IMPL_CYCLE_COLLECTION_DESCRIBE(nsXPCWrappedJS, refcnt)
}
// A wrapper that is subject to finalization will only die when its JS object dies.
if (tmp->IsSubjectToFinalization())
return NS_OK;
// Don't let the extra reference for nsSupportsWeakReference keep a wrapper that is
// not subject to finalization alive.
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "self");
cb.NoteXPCOMChild(s);
if (tmp->IsValid()) {
MOZ_ASSERT(refcnt > 1);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mJSObj");
cb.NoteJSChild(tmp->GetJSObjectPreserveColor());
}
if (tmp->IsRootWrapper()) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "aggregated native");
cb.NoteXPCOMChild(tmp->GetAggregatedNativeObject());
} else {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "root");
cb.NoteXPCOMChild(ToSupports(tmp->GetRootWrapper()));
}
return NS_OK;
}
static NS_METHOD TraverseImpl(JSContextParticipant *that, void *n,
nsCycleCollectionTraversalCallback &cb)
{
JSContext *cx = static_cast<JSContext*>(n);
// JSContexts do not have an internal refcount and always have a single
// owner (e.g., nsJSContext). Thus, the default refcount is 1. However,
// in the (abnormal) case of synchronous cycle-collection, the context
// may be actively executing code in which case we want to treat it as
// rooted by adding an extra refcount.
unsigned refCount = js::ContextHasOutstandingRequests(cx) ? 2 : 1;
cb.DescribeRefCountedNode(refCount, "JSContext");
if (JSObject *global = js::GetDefaultGlobalForContext(cx)) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "[global object]");
cb.NoteJSChild(global);
}
return NS_OK;
}
