WebKit2 can load the same plugin multiple times

[Adam Roben (:aroben)]

It's possible for WebKit2 to load the same plugin multiple times. This can happen, e.g., if a client application passes the path to a standard plugin directory to _WKContextSetAdditionalPluginsDirectory, or if a plugin in one of the standard plugin directories on Windows is also listed in the MozillaPlugins registry key.

[Adam Roben (:aroben)]

We could change how we load plugins to:

1) Collect all plugin paths from all directories
2) Put all the paths in a HashSet to get rid of duplicates
3) Load plugins specified in the HashSet

On Windows, we'd probably want to use a case-insensitive HashSet.

[Adam Roben (:aroben)]

<rdar://problem/8552178>

[Adam Roben (:aroben)]

Created attachment 70763 [details]
Make sure WebKit2 only loads each plugin once

[Sam Weinig]

Comment on attachment 70763 [details]
Make sure WebKit2 only loads each plugin once

View in context: https://bugs.webkit.org/attachment.cgi?id=70763&action=review

> WebKit2/UIProcess/Plugins/PluginInfoStore.cpp:59
> +template <typename T, typename U, typename V, typename W>
> +static void addFromVector(HashSet<T, U, V>& hashSet, const W& vector)
> +{
> +    for (size_t i = 0; i < vector.size(); ++i)
> +        hashSet.add(vector[i]);
> +}

Should this be in HashSet.h?

[Adam Roben (:aroben)]

Comment on attachment 70763 [details]
Make sure WebKit2 only loads each plugin once

View in context: https://bugs.webkit.org/attachment.cgi?id=70763&action=review

>> WebKit2/UIProcess/Plugins/PluginInfoStore.cpp:59
>> +}
> 
> Should this be in HashSet.h?

If we find it to be more generally useful we could put it there.

Thanks for reviewing!

[Adam Roben (:aroben)]

Committed r69790: <http://trac.webkit.org/changeset/69790>