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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#include "xpcprivate.h"
#include "XPCJSWeakReference.h"
#include "nsContentUtils.h"
using namespace JS;
xpcJSWeakReference::xpcJSWeakReference() = default;
NS_IMPL_ISUPPORTS(xpcJSWeakReference, xpcIJSWeakReference)
nsresult xpcJSWeakReference::Init(JSContext* cx, const JS::Value& object) {
if (!object.isObject()) {
return NS_OK;
JS::RootedObject obj(cx, &object.toObject());
XPCCallContext ccx(cx);
// See if the object is a wrapped native that supports weak references.
nsCOMPtr<nsISupports> supports = xpc::ReflectorToISupportsDynamic(obj, cx);
nsCOMPtr<nsISupportsWeakReference> supportsWeakRef =
if (supportsWeakRef) {
if (mReferent) {
return NS_OK;
// If it's not a wrapped native, or it is a wrapped native that does not
// support weak references, fall back to getting a weak ref to the object.
// See if object is a wrapped JSObject.
RefPtr<nsXPCWrappedJS> wrapped;
nsresult rv = nsXPCWrappedJS::GetNewOrUsed(cx, obj, NS_GET_IID(nsISupports),
if (!wrapped) {
NS_ERROR("can't get nsISupportsWeakReference wrapper for obj");
return rv;
return wrapped->GetWeakReference(getter_AddRefs(mReferent));
xpcJSWeakReference::Get(JSContext* aCx, MutableHandleValue aRetval) {
if (!mReferent) {
return NS_OK;
nsCOMPtr<nsISupports> supports = do_QueryReferent(mReferent);
if (!supports) {
return NS_OK;
nsCOMPtr<nsIXPConnectWrappedJS> wrappedObj = do_QueryInterface(supports);
if (!wrappedObj) {
// We have a generic XPCOM object that supports weak references here.
// Wrap it and pass it out.
return nsContentUtils::WrapNative(aCx, supports, &NS_GET_IID(nsISupports),
JS::RootedObject obj(aCx, wrappedObj->GetJSObject());
if (!obj) {
return NS_OK;
// Most users of XPCWrappedJS don't need to worry about
// re-wrapping because things are implicitly rewrapped by
// xpcconvert. However, because we're doing this directly
// through the native call context, we need to call
// JS_WrapObject().
if (!JS_WrapObject(aCx, &obj)) {
return NS_OK;