[Webkit-unassigned] [Bug 144001] Make FunctionRareData allocation thread-safe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=144001

--- Comment #10 from Basile Clement <basile_clement at apple.com> ---
Comment on attachment 251483
  --> https://bugs.webkit.org/attachment.cgi?id=251483
Too many different working directories are bad for your health

View in context: https://bugs.webkit.org/attachment.cgi?id=251483&action=review

>> Source/JavaScriptCore/runtime/JSFunction.h:127
>> +        WTF::loadLoadFence();
> 
> Sometimes, we load this pointer in JIT code. Does our JIT code need to include a load-load fence?

The load-load fence is only needed if there is possibly a concurrent thread writing to that pointer. 
The only thread writing to the pointer being the JS thread, which is also the only thread running the JIT code (as far as I understand), no fence should be needed.

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