/* static */ already_AddRefed<Promise>
Promise::Constructor(const GlobalObject& aGlobal, JSContext* aCx,
PromiseInit& aInit, ErrorResult& aRv)
{
MOZ_ASSERT(PrefEnabled());
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.Get());
if (!window) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return nullptr;
}
nsRefPtr<Promise> promise = new Promise(window);
aInit.Call(promise, *promise->mResolver, aRv,
CallbackObject::eRethrowExceptions);
aRv.WouldReportJSException();
if (aRv.IsJSException()) {
Optional<JS::Handle<JS::Value> > value(aCx);
aRv.StealJSException(aCx, &value.Value());
Maybe<JSAutoCompartment> ac;
EnterCompartment(ac, aCx, value);
promise->mResolver->Reject(aCx, value);
}
return promise.forget();
}
void
WrapperPromiseCallback::Call(const Optional<JS::Handle<JS::Value> >& aValue)
{
AutoJSContext cx;
Maybe<JSAutoCompartment> ac;
EnterCompartment(ac, cx, aValue);
ErrorResult rv;
// If invoking callback threw an exception, run resolver's reject with the
// thrown exception as argument and the synchronous flag set.
Optional<JS::Handle<JS::Value> > value(cx,
mCallback->Call(mNextResolver->GetParentObject(), aValue, rv,
CallbackObject::eRethrowExceptions));
rv.WouldReportJSException();
if (rv.Failed() && rv.IsJSException()) {
Optional<JS::Handle<JS::Value> > value(cx);
rv.StealJSException(cx, &value.Value());
Maybe<JSAutoCompartment> ac2;
EnterCompartment(ac2, cx, value);
mNextResolver->RejectInternal(cx, value, PromiseResolver::SyncTask);
return;
}
// Otherwise, run resolver's resolve with value and the synchronous flag
// set.
Maybe<JSAutoCompartment> ac2;
EnterCompartment(ac2, cx, value);
mNextResolver->ResolveInternal(cx, value, PromiseResolver::SyncTask);
}
void
WrapperPromiseCallback::Call(const Optional<JS::Handle<JS::Value> >& aValue)
{
AutoJSContext cx;
// FIXME Bug 878849
Maybe<JSAutoCompartment> ac;
if (aValue.WasPassed() && aValue.Value().isObject()) {
JS::Rooted<JSObject*> rooted(cx, &aValue.Value().toObject());
ac.construct(cx, rooted);
}
ErrorResult rv;
// If invoking callback threw an exception, run resolver's reject with the
// thrown exception as argument and the synchronous flag set.
Optional<JS::Handle<JS::Value> > value(cx,
mCallback->Call(mNextResolver->GetParentObject(), aValue, rv,
CallbackObject::eRethrowExceptions));
rv.WouldReportJSException();
if (rv.Failed() && rv.IsJSException()) {
Optional<JS::Handle<JS::Value> > value(cx);
rv.StealJSException(cx, &value.Value());
mNextResolver->RejectInternal(cx, value, PromiseResolver::SyncTask);
return;
}
// Otherwise, run resolver's resolve with value and the synchronous flag
// set.
mNextResolver->ResolveInternal(cx, value, PromiseResolver::SyncTask);
}
void
WrapperPromiseCallback::Call(JS::Handle<JS::Value> aValue)
{
// AutoCxPusher and co. interact with xpconnect, which crashes on
// workers. On workers we'll get the right context from
// GetDefaultJSContextForThread(), and since there is only one context, we
// don't need to push or pop it from the stack.
JSContext* cx = nsContentUtils::GetDefaultJSContextForThread();
Maybe<AutoCxPusher> pusher;
if (NS_IsMainThread()) {
pusher.construct(cx);
}
Maybe<JSAutoCompartment> ac;
EnterCompartment(ac, cx, aValue);
ErrorResult rv;
// If invoking callback threw an exception, run resolver's reject with the
// thrown exception as argument and the synchronous flag set.
JS::Rooted<JS::Value> value(cx,
mCallback->Call(mNextPromise->GetParentObject(), aValue, rv,
CallbackObject::eRethrowExceptions));
rv.WouldReportJSException();
if (rv.Failed() && rv.IsJSException()) {
JS::Rooted<JS::Value> value(cx);
rv.StealJSException(cx, &value);
Maybe<JSAutoCompartment> ac2;
EnterCompartment(ac2, cx, value);
mNextPromise->RejectInternal(cx, value, Promise::SyncTask);
return;
}
// Otherwise, run resolver's resolve with value and the synchronous flag
// set.
Maybe<JSAutoCompartment> ac2;
EnterCompartment(ac2, cx, value);
mNextPromise->ResolveInternal(cx, value, Promise::SyncTask);
}
void
WrapperPromiseCallback::Call(JSContext* aCx,
JS::Handle<JS::Value> aValue)
{
JSAutoCompartment ac(aCx, mGlobal);
JS::Rooted<JS::Value> value(aCx, aValue);
if (!JS_WrapValue(aCx, &value)) {
NS_WARNING("Failed to wrap value into the right compartment.");
return;
}
ErrorResult rv;
// If invoking callback threw an exception, run resolver's reject with the
// thrown exception as argument and the synchronous flag set.
JS::Rooted<JS::Value> retValue(aCx);
mCallback->Call(value, &retValue, rv, CallbackObject::eRethrowExceptions);
rv.WouldReportJSException();
if (rv.Failed() && rv.IsJSException()) {
JS::Rooted<JS::Value> value(aCx);
rv.StealJSException(aCx, &value);
if (!JS_WrapValue(aCx, &value)) {
NS_WARNING("Failed to wrap value into the right compartment.");
return;
}
mNextPromise->RejectInternal(aCx, value, Promise::SyncTask);
return;
}
// If the return value is the same as the promise itself, throw TypeError.
if (retValue.isObject()) {
JS::Rooted<JSObject*> valueObj(aCx, &retValue.toObject());
Promise* returnedPromise;
nsresult r = UNWRAP_OBJECT(Promise, valueObj, returnedPromise);
if (NS_SUCCEEDED(r) && returnedPromise == mNextPromise) {
const char* fileName = nullptr;
uint32_t lineNumber = 0;
// Try to get some information about the callback to report a sane error,
// but don't try too hard (only deals with scripted functions).
JS::Rooted<JSObject*> unwrapped(aCx,
js::CheckedUnwrap(mCallback->Callback()));
if (unwrapped) {
JSAutoCompartment ac(aCx, unwrapped);
if (JS_ObjectIsFunction(aCx, unwrapped)) {
JS::Rooted<JS::Value> asValue(aCx, JS::ObjectValue(*unwrapped));
JS::Rooted<JSFunction*> func(aCx, JS_ValueToFunction(aCx, asValue));
MOZ_ASSERT(func);
JSScript* script = JS_GetFunctionScript(aCx, func);
if (script) {
fileName = JS_GetScriptFilename(script);
lineNumber = JS_GetScriptBaseLineNumber(aCx, script);
}
}
}
// We're back in aValue's compartment here.
JS::Rooted<JSString*> stack(aCx, JS_GetEmptyString(JS_GetRuntime(aCx)));
JS::Rooted<JSString*> fn(aCx, JS_NewStringCopyZ(aCx, fileName));
if (!fn) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(aCx);
return;
}
JS::Rooted<JSString*> message(aCx,
JS_NewStringCopyZ(aCx,
"then() cannot return same Promise that it resolves."));
if (!message) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(aCx);
return;
}
JS::Rooted<JS::Value> typeError(aCx);
if (!JS::CreateTypeError(aCx, stack, fn, lineNumber, 0,
nullptr, message, &typeError)) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(aCx);
return;
}
mNextPromise->RejectInternal(aCx, typeError, Promise::SyncTask);
return;
}
}
// Otherwise, run resolver's resolve with value and the synchronous flag
// set.
if (!JS_WrapValue(aCx, &retValue)) {
NS_WARNING("Failed to wrap value into the right compartment.");
return;
}
mNextPromise->ResolveInternal(aCx, retValue, Promise::SyncTask);
}
void
WrapperPromiseCallback::Call(JS::Handle<JS::Value> aValue)
{
// AutoCxPusher and co. interact with xpconnect, which crashes on
// workers. On workers we'll get the right context from
// GetDefaultJSContextForThread(), and since there is only one context, we
// don't need to push or pop it from the stack.
JSContext* cx = nsContentUtils::GetDefaultJSContextForThread();
Maybe<AutoCxPusher> pusher;
if (NS_IsMainThread()) {
pusher.construct(cx);
}
Maybe<JSAutoCompartment> ac;
EnterCompartment(ac, cx, aValue);
ErrorResult rv;
// If invoking callback threw an exception, run resolver's reject with the
// thrown exception as argument and the synchronous flag set.
JS::Rooted<JS::Value> value(cx,
mCallback->Call(aValue, rv, CallbackObject::eRethrowExceptions));
rv.WouldReportJSException();
if (rv.Failed() && rv.IsJSException()) {
JS::Rooted<JS::Value> value(cx);
rv.StealJSException(cx, &value);
Maybe<JSAutoCompartment> ac2;
EnterCompartment(ac2, cx, value);
mNextPromise->RejectInternal(cx, value, Promise::SyncTask);
return;
}
// If the return value is the same as the promise itself, throw TypeError.
if (value.isObject()) {
JS::Rooted<JSObject*> valueObj(cx, &value.toObject());
Promise* returnedPromise;
nsresult r = UNWRAP_OBJECT(Promise, valueObj, returnedPromise);
if (NS_SUCCEEDED(r) && returnedPromise == mNextPromise) {
const char* fileName = nullptr;
uint32_t lineNumber = 0;
// Try to get some information about the callback to report a sane error,
// but don't try too hard (only deals with scripted functions).
JS::Rooted<JSObject*> unwrapped(cx,
js::CheckedUnwrap(mCallback->Callback()));
if (unwrapped) {
JSAutoCompartment ac(cx, unwrapped);
if (JS_ObjectIsFunction(cx, unwrapped)) {
JS::Rooted<JS::Value> asValue(cx, JS::ObjectValue(*unwrapped));
JS::Rooted<JSFunction*> func(cx, JS_ValueToFunction(cx, asValue));
MOZ_ASSERT(func);
JSScript* script = JS_GetFunctionScript(cx, func);
if (script) {
fileName = JS_GetScriptFilename(cx, script);
lineNumber = JS_GetScriptBaseLineNumber(cx, script);
}
}
}
// We're back in aValue's compartment here.
JS::Rooted<JSString*> stack(cx, JS_GetEmptyString(JS_GetRuntime(cx)));
JS::Rooted<JSString*> fn(cx, JS_NewStringCopyZ(cx, fileName));
if (!fn) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(cx);
return;
}
JS::Rooted<JSString*> message(cx,
JS_NewStringCopyZ(cx,
"then() cannot return same Promise that it resolves."));
if (!message) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(cx);
return;
}
JS::Rooted<JS::Value> typeError(cx);
if (!JS::CreateTypeError(cx, stack, fn, lineNumber, 0,
nullptr, message, &typeError)) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(cx);
return;
}
mNextPromise->RejectInternal(cx, typeError, Promise::SyncTask);
return;
}
}
// Otherwise, run resolver's resolve with value and the synchronous flag
// set.
Maybe<JSAutoCompartment> ac2;
EnterCompartment(ac2, cx, value);
mNextPromise->ResolveInternal(cx, value, Promise::SyncTask);
}