[Webkit-unassigned] [Bug 67993] New: Prediction tracking is not precise enough

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Sep 13 02:44:41 PDT 2011


https://bugs.webkit.org/show_bug.cgi?id=67993

           Summary: Prediction tracking is not precise enough
           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


The predictions deduced from value profiles are not precise.  For example, we can identify something as being an array, or just as a cell, but we don't know when something is an object that is not an array.  We also don't have any way of distinguishing between Top (i.e. "could be anything") and Undefined/Null.  Prediction tracking should be at least precise enough to be able to identify common kinds of objects like JSFinalObject, JSString, and JSArray, and should be able to distinguish between a type being completely unknown and being, say, "Undefined or Null or Object".

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