[Webkit-unassigned] [Bug 206365] New: Separate storage of Structure offset in previous and last offset

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206365

            Bug ID: 206365
           Summary: Separate storage of Structure offset in previous and
                    last offset
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: justin_michaud at apple.com

Right now, deleteProperty/removePropertyTransition causes a structure transition to uncacheable dictionary. Other transitions assume that the offset is monotonically increasing. In order to support structure transitions for deletion, we separate the offset that was added/deleted from the last offset.

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