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Add util.weakReference that won't crash if you pass null.

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This commit is contained in:
Kris Maglione
2011-10-01 23:02:00 -04:00
parent c9583ac72f
commit 84a68bff9a
12 changed files with 25 additions and 15 deletions
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9
common/modules/util.jsm
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@@ -1550,6 +1550,15 @@ var Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
return res.filter(function (h) !Set.add(seen, h.spec));
},
/**
* Like Cu.getWeakReference, but won't crash if you pass null.
*/
weakReference: function weakReference(jsval) {
if (jsval == null)
return { get: function get() null };
return Cu.getWeakReference(jsval);
},
/**
* Wraps native exceptions thrown by the called function so that a
* proper stack trace may be retrieved from them.