JSObject *
WrapperFactory::WrapForSameCompartment(JSContext *cx, HandleObject objArg)
{
RootedObject obj(cx, objArg);
MOZ_ASSERT(js::IsObjectInContextCompartment(obj, cx));
// NB: The contract of WrapForSameCompartment says that |obj| may or may not
// be a security wrapper. These checks implicitly handle the security
// wrapper case.
// Outerize if necessary. This, in combination with the check in
// PrepareForUnwrapping, means that calling JS_Wrap* always outerizes.
obj = JS_ObjectToOuterObject(cx, obj);
NS_ENSURE_TRUE(obj, nullptr);
if (dom::GetSameCompartmentWrapperForDOMBinding(*obj.address())) {
return obj;
}
MOZ_ASSERT(!dom::IsDOMObject(obj));
if (!IS_WN_WRAPPER(obj))
return obj;
// Extract the WN. It should exist.
XPCWrappedNative *wn = static_cast<XPCWrappedNative *>(xpc_GetJSPrivate(obj));
MOZ_ASSERT(wn, "Trying to wrap a dead WN!");
// The WN knows what to do.
RootedObject wrapper(cx, wn->GetSameCompartmentSecurityWrapper(cx));
MOZ_ASSERT_IF(wrapper != obj && IsComponentsObject(js::UncheckedUnwrap(obj)),
!Wrapper::wrapperHandler(wrapper)->isSafeToUnwrap());
return wrapper;
}
