[Webkit-unassigned] [Bug 231506] New: Investigate `JSGlobalObject == JSDOMGlobalObject` WebCore assumption in presence of Shadow Realms

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231506

            Bug ID: 231506
           Summary: Investigate `JSGlobalObject == JSDOMGlobalObject`
                    WebCore assumption in presence of Shadow Realms
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pmates at igalia.com

A lot of WebCore code assumes that JSGlobalObject instances are the JSDOMGlobalObject subclass.
For example, when `incumbentDOMWindow` is traversing JSGlobalObjects in the callstack, and it assumes that these ones are JSDOMWindow.

After introducing Shadow Realms, via https://bugs.webkit.org/show_bug.cgi?id=230602, this won't necessarily be true. That is WebCore's assumption that `JSGlobalObject == JSDOMGlobalObject` might no longer be valid.

This ticket a is a reminder that we need to investigate this and properly adapt the code if needed

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20211011/4d1e84a6/attachment.htm>