2011-05-27 Geoffrey Garen <ggaren@apple.com>

2011-05-27  Geoffrey Garen  <ggaren@apple.com>

        Reviewed by Oliver Hunt.

        JS API is too aggressive about throwing exceptions for NULL get or set operations
        https://bugs.webkit.org/show_bug.cgi?id=61678

        * API/JSCallbackObject.h: Changed our staticValueGetter to a regular
        function that returns a JSValue, so it can fail and still forward to
        normal property lookup.

        * API/JSCallbackObjectFunctions.h:
        (JSC::::getOwnPropertySlot): Don't throw an exception when failing to
        access a static property -- just forward the access. This allows objects
        to observe get/set operations but still let the JS object manage lifetime.

        (JSC::::put): Ditto.

        (JSC::::getStaticValue): Same as JSCallbackObject.h.

        * API/tests/testapi.c:
        (MyObject_set_nullGetForwardSet):
        * API/tests/testapi.js: Updated tests to reflect slightly less strict
        behavior, which matches headerdoc claims.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@87588 268f45cc-cd09-0410-ab3c-d52691b4dbfc