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oliver@apple.com authored
https://bugs.webkit.org/show_bug.cgi?id=28724 Reviewed by Gavin Barraclough. JavaScriptCore: Implement the core runtime support for getOwnPropertyDescriptor. This adds a virtual getOwnPropertyDescriptor method to every class that implements getOwnPropertySlot that shadows the behaviour of getOwnPropertySlot. The alternative would be to make getOwnPropertySlot (or PropertySlots in general) provide property attribute information, but quick testing showed this to be a regression. WebCore: Implement the WebCore side of getOwnPropertyDescriptor. This requires a custom implementation of getOwnPropertyDescriptor for every class with a custom implementation of getOwnPropertySlot. The bindings generator has been updated to generate appropriate versions of getOwnPropertyDescriptor for the general case where a custom getOwnPropertyDescriptor is not needed. ES5 is vague about how getOwnPropertyDescriptor should work in the context of "host" functions with polymorphic [[GetOwnProperty]], so it seems okay that occasionally we "guess" what attributes -- eg. determining whether a property is writable. Test: fast/js/getOwnPropertyDescriptor.html git-svn-id: http://svn.webkit.org/repository/webkit/trunk@47780 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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