[Webkit-unassigned] [Bug 75588] New: unshift/pop fifo may consume excessive memory

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75588

           Summary: unshift/pop fifo may consume excessive memory
           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


Array object commonly store data in a vector, consisting of a portion that is in use, a pre-capacity (m_indexBias) and a post-capacity (the delta between m_length and m_vectorLength).  Calls to pop with grow the post-capacity, and the current algorithm for increasePrefixVectorLength (used by unshift) will never stink the post-capacity, so a unshift/pop fifo may consume an inordinate amount of memory, whilst having a relatively small active length.

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