[webkit-dev] JavaScriptCore holding onto objects unnecessarily long

[Yadong Liu]

Hi,

Our project is using JavaScriptCore to drive application logic and creation
of native UIView hierarchies. A typical use case will involve an
Objective-C class that exposes a number of methods and properties to
JSCore. From the JavaScript side, we create an JSValue object wrapping an
instance of the Objective-C object, and once we are done we remove all
references to it.

One problem we are running into is that the deallocation of the Objective-C
object seems unpredictable, meaning that sometimes the dealloc() method of
said object is invoked immediately, but sometimes it takes up to a couple
of minutes before it would be called. To illustrate the issue, I created
and attached to this email a simple Xcode project. When you run the project
and click the 'Run Script' button (one or multiple times), you can watch
the Xcode debug console for relevant logs and observe when "Person dealloc
- name is bill" would appear.  And btw, my tests were done in Xcode 7 with
iPhone 6 (iOS 9) simulator.

So my question is: what I need to do to make sure the my Objective-C
object's dealloc() is called immediately as soon as my JavaScript code
removes all references to the object?

Thanks in advance,

-- 
- Yadong
Sr. Mobile Engineer
Fingerprint Digital Inc.
http://www.fingerprintplay.com
1-855-KID-GAME

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