Nice work.
I wonder if there are similar patterns happening elsewhere, in
particular, in the part that loads libraries. Will have to take a
look.
On Wed, Jul 11, 2012 at 11:12 PM, Timothy Baldridge
<tbaldri...@gmail.com> wrote:
>>But the real issue is the stacktrace one. In this case, the bug could
>>have been found by static analysis. But in general, it can not.
>
> I experienced this same issue and tracked it down to a bug in goog, at
> least in my case.
>
> In my case, I was making a JSON request to the server. When the
> response came back I was throwing an error due to a null reference.
> However, the handler code in goog for a JSON request looks something
> like this:
>
> goog.events.fireListeners_ = function(map, obj, type, capture, eventObject) {
> var retval = 1;
> var objUid = goog.getUid(obj);
> if(map[objUid]) {
> map.remaining_--;
> var listenerArray = map[objUid];
> if(!listenerArray.locked_) {
> listenerArray.locked_ = 1
> }else {
> listenerArray.locked_++
> }
> try {
> var length = listenerArray.length;
> for(var i = 0;i < length;i++) {
> var listener = listenerArray[i];
> if(listener && !listener.removed) {
> retval &= goog.events.fireListener(listener, eventObject) !== false
> }
> }
> }finally {
> listenerArray.locked_--;
> goog.events.cleanUp_(type, capture, objUid, listenerArray)
> }
> }
> return Boolean(retval)
> };
>
> So this basically means that the finally block eats any exceptions
> fired by the listeners. I got around this issue by wrapping part of my
> response handler in this:
>
> (defn defer-execution [f]
> (js/setTimeout f 1))
>
> This basically bounces the execution context of the function outside
> of the finally, and that then allows any exceptions to be logged in
> the debugger.
>
> I'm not sure if this helps at all, but it took me about a week (on and
> off) to track this issue down.
>
> Timothy
>
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