Bug 128443 – Don't throw away code if there is code on the worklists

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Filip Pizlo]

Patch forthcoming.

[Filip Pizlo]

Created attachment 223551 [details]
the patch

[Joseph Pecoraro]

Comment on attachment 223551 [details]
the patch

View in context: https://bugs.webkit.org/attachment.cgi?id=223551&action=review

r=me

> Source/JavaScriptCore/dfg/DFGWorklist.h:73
> +    bool isActive() { return !!m_plans.size(); }

Nit: const

[Filip Pizlo]

Landed in http://trac.webkit.org/changeset/163695

[Geoffrey Garen]

Comment on attachment 223551 [details]
the patch

View in context: https://bugs.webkit.org/attachment.cgi?id=223551&action=review

> Source/JavaScriptCore/heap/Heap.cpp:738
> +    // If we have things on any worklist, then don't delete code. This is kind of
> +    // a weird heuristic. It's definitely not safe to throw away code that is on
> +    // the worklist. But this change was made in a hurry so we just avoid throwing

What about when we throw away code to enable the debugger?

[Filip Pizlo]

(In reply to comment #4)
> (From update of attachment 223551 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=223551&action=review
> 
> > Source/JavaScriptCore/heap/Heap.cpp:738
> > +    // If we have things on any worklist, then don't delete code. This is kind of
> > +    // a weird heuristic. It's definitely not safe to throw away code that is on
> > +    // the worklist. But this change was made in a hurry so we just avoid throwing
> 
> What about when we throw away code to enable the debugger?

That's a different code path.  That code path first waits for the worklist to finish.