bool
WrapperAnswer::fail(AutoJSAPI& jsapi, ReturnStatus* rs)
{
// By default, we set |undefined| unless we can get a more meaningful
// exception.
*rs = ReturnStatus(ReturnException(JSVariant(UndefinedVariant())));
// Note we always return true from this function, since this propagates
// to the IPC code, and we don't want a JS failure to cause the death
// of the child process.
JSContext* cx = jsapi.cx();
RootedValue exn(cx);
if (!jsapi.HasException())
return true;
jsapi.StealException(&exn);
if (JS_IsStopIteration(exn)) {
*rs = ReturnStatus(ReturnStopIteration());
return true;
}
// If this fails, we still don't want to exit. Just return an invalid
// exception.
(void) toVariant(cx, exn, &rs->get_ReturnException().exn());
return true;
}
void
ProfileGatherer::Finish()
{
MOZ_ASSERT(NS_IsMainThread());
if (!mTicker) {
// We somehow got called after we were cancelled! This shouldn't
// be possible, but doing a belt-and-suspenders check to be sure.
return;
}
UniquePtr<char[]> buf = mTicker->ToJSON(mSinceTime);
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
DebugOnly<nsresult> rv = os->RemoveObserver(this, "profiler-subprocess");
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "RemoveObserver failed");
}
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(mPromise->GlobalJSObject()))) {
// We're really hosed if we can't get a JS context for some reason.
Reset();
return;
}
JSContext* cx = jsapi.cx();
// Now parse the JSON so that we resolve with a JS Object.
JS::RootedValue val(cx);
{
NS_ConvertUTF8toUTF16 js_string(nsDependentCString(buf.get()));
if (!JS_ParseJSON(cx, static_cast<const char16_t*>(js_string.get()),
js_string.Length(), &val)) {
if (!jsapi.HasException()) {
mPromise->MaybeReject(NS_ERROR_DOM_UNKNOWN_ERR);
} else {
JS::RootedValue exn(cx);
DebugOnly<bool> gotException = jsapi.StealException(&exn);
MOZ_ASSERT(gotException);
jsapi.ClearException();
mPromise->MaybeReject(cx, exn);
}
} else {
mPromise->MaybeResolve(val);
}
}
Reset();
}