[Webkit-unassigned] [Bug 148440] New: DFG::AbstractHeap should be able to distinguish between heap locations that are user-observable and heap locations that are VM-internal

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148440

            Bug ID: 148440
           Summary: DFG::AbstractHeap should be able to distinguish
                    between heap locations that are user-observable and
                    heap locations that are VM-internal
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

If you write to a VM-internal heap, it shouldn't clobber exit, because the user won't know that you had done it.

Note that it's not as simple as that.  Depending on how you define "VM-internal", a VM-internal write might still put the system in a state where OSR exit is invalid even though the write was not user-observable.  So, it's not entirely obvious that this is a good idea, but it's worth thinking about.

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