[Webkit-unassigned] [Bug 75022] New: JSArray::shiftCount may be triggering unnecessary malloc churn

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75022

           Summary: JSArray::shiftCount may be triggering unnecessary
                    malloc churn
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: barraclough at apple.com


If we shift down to a zero size we'll decrement the vector length without incrementing the input bias.  I think the effect of this will just be to forget some of the size of the vector.

I think repeated shift/unshift may cause us to slowly forget how large the vector is, leading us to unnecessarily realloc.  I don't see any obvious memory leak / pointer badness here, but it does look like this will slowly churn memory through malloc.

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