[Webkit-unassigned] [Bug 163151] Web Inspector: Heap Snapshot should be able to tell me if an object was collected

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163151

--- Comment #6 from Joseph Pecoraro <joepeck at webkit.org> ---
(In reply to comment #3)
> One nice thing about the "alive + dead" display is that it allows you to see
> memory usage go up and / or down between snapshots.
> 
> Today, since old snapshots update when new snapshots are taken, they
> retroactively edit their total memory usage numbers, erasing debugging
> history.

The Snapshot List view shows both the original Size and the Live Size. The original Size never changes. When viewing the live objects within the snapshot, the Retain Size percentages are based off of the original Size not the current Live Size.


(In reply to comment #5)
> My perfect debugging scenario for what I was trying to do would go like this:
> 1. Take a snapshot
> 2. Pause JS execution
> 3. Find an object inside the snapshot
> 4. Ask the inspector to notify me when it gets destructed
> 5. continue JS execution
> 
> alternatively, some API for doing this like:
> ```
> let object = new Array(someLargeNumber);
> console.onDestruction(object, function callback() { ... });

This sounds very similar to the mark/paint feature request:
<https://webkit.org/b/154410> Web Inspector: Programmatically mark/paint objects for heap snapshot

If you could console.mark(object, "Tag") and then search for all the objects with "Tag" in the Snapshot, that would make it easy to find the object in and across snapshots.

What is it you want to actually do with the object once you've seen it was collected. Just log?

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