I know that the question is about DIC only, but there is a Silex Pimple Dumper service provider which dumps the container to a json file. The same author wrote a plugin for PHPStorm which can read that file and open the autocomplete with the service names and its type (class, string and etc). I'm using those two components and I can say that are good options for auto completion for Silex/Pimple.
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