[Webkit-unassigned] [Bug 69570] New: DFG should not always speculate that ConvertThis is operating on an object

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69570

           Summary: DFG should not always speculate that ConvertThis is
                    operating on an object
           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


There is code out there (and indeed some of it in our own SunSpider, as well as V8 and Kraken) that does:

function foo(…) {
    ….
    this.bar
    ….
}

foo(…);

So that ConvertThis sees undefined and needs to convert it to a global object.  We should not just always fail speculation when this happens.

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