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

[bugzilla-daemon at webkit.org]

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

--- Comment #9 from Geoffrey Garen <ggaren 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
> +        FunctionRareData* rareData = m_rareData.get();
>  
> -        return m_rareData.get()->allocationStructure();
> +        // The JS thread may be concurrently creating the rare data
> +        // If we see it, we want to ensure it has been properly created
> +        WTF::loadLoadFence();

Sometimes, we load this pointer in JIT code. Does our JIT code need to include a load-load fence?

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