Method protectedCall

lua.go:1239–1251

(f func(), oldTop, errorFunc int)

}

func (l *State) protectedCall(f func(), oldTop, errorFunc int) error {
	callInfo, allowHook, nonYieldableCallCount, errorFunction := l.callInfo, l.allowHook, l.nonYieldableCallCount, l.errorFunction
	l.errorFunction = errorFunc
	err := l.protect(f)
	if err != nil {
		l.close(oldTop)
		l.setErrorObject(err, oldTop)
		l.callInfo, l.allowHook, l.nonYieldableCallCount = callInfo, allowHook, nonYieldableCallCount
		// TODO l.shrinkStack()
	}
	l.errorFunction = errorFunction
	return err
}

// UpValue returns the name of the upvalue at index away from function,
// where index cannot be greater than the number of upvalues.