[Webkit-unassigned] [Bug 64745] New: JSC GC lazy sweep does not inline the common cases of cell destruction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64745

           Summary: JSC GC lazy sweep does not inline the common cases of
                    cell destruction
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


Most objects in the heap are instances of JSFinalObject, which has a relatively straight-forward destructor.  This destructor's common case is to do nothing: the property storage is not inline, so there is nothing to destroy.  However, the lazy sweep will currently always make a slow virtual call because it doesn't special-case the common cases.

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