[Webkit-unassigned] [Bug 91933] New: JSC should have property butterflies

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=91933

           Summary: JSC should have property butterflies
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


In a butterfly object model, you point into the middle of an object, and one set of properties is offset to the left (negative address direction) of the pointer while another distinct set is offset to the right (positive).  JSC should use this approach for property storage, so that named (and private) properties grow to the left while indexed properties grow to the right.  This will immediately yield two benefits: (1) all objects will have fast indexed storage and (2) indexed storage access will not have to perform the array type check.

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