[webkit-dev] Accessing WebKit JS binding classes from non-WebKit JavaScript Core applications?

Eric Seidel eric at webkit.org
Tue Apr 27 15:51:58 PDT 2010

DerivedSources are generated from here:

I think what your'e thinking of as DerivedSources is actually just the
javascript bindings, which will be useless to you w/o the actual
implementations in WebCore.

If for some reason you wanted to write your own custom bindings which
use JSC's public API instead of the internal one which WebCore uses,
you could make your own generator script:

You can see examples of those scripts being run in DerivedSources.make
or in run-bindings-tests:

In short, this is not a supported configuration. :)  I'm also not
really sure it's on topic for this list.

Best of luck!


On Tue, Apr 27, 2010 at 3:44 PM, Josh Shagam <Joshua.Shagam at am.sony.com> wrote:
> Hi, I'm working on a project which makes use of JavaScriptCore as a
> scripting engine outside of WebKit.  It would be very helpful to us if we
> could get access to the DOMParser and XMLSerializer classes which are in
> WebKit's DerivedSources area.  However, it seems that those libraries are
> using JavaScript Core's internal/private API (JSC::ExecState, JSC::Value,
> etc.) rather than the public interface expected by external users of
> JavaScript Core.
> We'd also like to avoid pulling in the internal WebKit headers anyway, as
> this would complicate our build system (for example, we'd like to be able to
> do this just using the header files provided by Ubuntu's libwebkit-dev
> package).  I'm fine with writing forward-declaration classes and stub
> methods for the purpose of letting the C++ linker figure it all out, but
> JSC::JSValue seems to get in the way of this idea, since the
> getConstructor() methods on the libraries we want return it by value rather
> than by reference (and it doesn't appear to be a simple reinterpret_cast
> like it is for the other public-API classes).
> Is there some official way that we can get at WebKit's DerivedSources
> library functionality in a non-WebKit JavaScript Core application, or can
> anyone think of some tricky-but-relatively-clean way to do it that doesn't
> involve our app having to see JSC's internal API?
> Thanks in advance.
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