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;
}
Example #2
0
#include "nsThreadUtils.h"
#include "nsTextFormatter.h"

// NOTE: much of the fancy footwork is done in xpcstubs.cpp

NS_IMPL_CYCLE_COLLECTION_CLASS(nsXPCWrappedJS)

NS_IMETHODIMP
NS_CYCLE_COLLECTION_CLASSNAME(nsXPCWrappedJS)::TraverseImpl
   (NS_CYCLE_COLLECTION_CLASSNAME(nsXPCWrappedJS) *that, 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