[Webkit-unassigned] [Bug 100461] New: Forward OSR calculation is wrong in the presence of multiple SetLocals, or a mix of SetLocals and Phantoms

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100461

           Summary: Forward OSR calculation is wrong in the presence of
                    multiple SetLocals, or a mix of SetLocals and Phantoms
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


This was broken by the attempt to have the forward OSR exit calculator collect all SetLocals and create recovery overrides for them.  The fix is to not do that, and instead have bytecode ops that decompose into multiple SetLocals explicitly help the forward OSR exit calculator with SetLocal hints.

<rdar://problem/12551946>

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