Hi all,
For a while, ports like wx and Win/Cairo have been seeing various
leaks reported on shutdown, but at least on Mac I've been unable to
see these leaks using memory leak checkers like the one in
Instruments, so I decided to poke into the code a bit more and try to
understand what's going on a bit better.
What I found was that the reported object leaks were pretty much all
related to objects that JSC has references to. Changing
~ScriptController to do a garbageCollectNow() instead of
garbageCollectSoon(), for example, drastically reduced the number of
reported leaks, cleaning up all the CachedResource leaks and almost
all the WebCoreNode leaks. The remaining leaks were almost all
JSC::Structure objects. I've been digging through the code to try and
find the place where these JSC objects are finally deleted, but I
haven't found anyplace obvious in the code, neither in common code nor
in the ports' code.
My question is, is there somewhere these objects are being deleted on
final shutdown that apparently happens after the leaks are reported,
or does WebKit have assumptions such as that all still running timers
must fire before final shutdown that ports such as ours are not
honoring? (e.g. in my tests garbageCollectSoon() does not end up
firing the callback because the app shuts down too fast.)
Thanks,
Kevin
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