[Webkit-unassigned] [Bug 140805] New: Sink function allocations, and then the activation allocation, to a point where we know that let-bound variables are initialized - and then allow those functions' code to be optimized without TDZ checks

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Jan 22 17:47:36 PST 2015


https://bugs.webkit.org/show_bug.cgi?id=140805

            Bug ID: 140805
           Summary: Sink function allocations, and then the activation
                    allocation, to a point where we know that let-bound
                    variables are initialized - and then allow those
                    functions' code to be optimized without TDZ checks
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

The optimizing compiler already has the ability to sink allocations to the point where they escape.  Doing this for activation and function allocations would enable us to prove cases where the function cannot see the TDZ of some let-bound variables.

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