Bug 71333 – Object.getOwnPropertyDescriptor() does not retrieve the getter/setter from a property on the window that has been overridden with a getter/setter

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Sam Weinig]

Object.getOwnPropertyDescriptor().get/set does not behave the same as __lookupGetter__/__lookupSetter__ on window properties.

For:

window.y = 1;
window.__defineGetter__("y", function() { return "window.y __getter__"; });

__lookupGetter__ doesn't do the same thing as Object.getOwnPropertyDescriptor:

typeof window.__lookupGetter__('y') != typeof Object.getOwnPropertyDescriptor(window, 'y').get;

[Sam Weinig]

This is now tested in fast/dom/getter-on-window-object2.html.

[Sam Weinig]

The real bug here is not that they behave inconsistently (that will be change shortly by implementing __lookupGetter__ in terms of Object.getOwnPropertyDescriptor()), but that Object.getOwnPropertyDescriptor() does not retrieve the getter/setter from a property on the window that has been overridden with a getter/setter.

[Sam Weinig]

As of r99034, __lookupGetter__/__lookupSetter__ match Object.getOwnPropertyDescriptor, and now both are wrong.

[Sam Weinig]

Created attachment 113426 [details]
Patch

[Sam Weinig]

Committed r99136: <http://trac.webkit.org/changeset/99136>