[Webkit-unassigned] [Bug 40071] New: Objects invoking script need to know when the relevant ScriptExecutionContext has torn down.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=40071

           Summary: Objects invoking script need to know when the relevant
                    ScriptExecutionContext has torn down.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: andreip at google.com
                CC: jorlow at chromium.org, steveblock at google.com


Objects invoking script (e.g. geolocation, indexedDB, database) need a ScriptExecutionContext instance in order to be able to invoke script (e.g. when a new geoposition is available, an object store is open, an SQL statement finishes executing). In all these cases, Javascript should be invoked in the context in which the object's method was called. However, at Javascript invocation time, the relevant ScriptExecutionContext may have been torn down. Note that the ScriptExecutionContext may be from frames other than the one that owns the object so we cannot rely on the owner frame's "disconnectFrame".  Instead, we need to if the relevant ScriptExecutionContext still exists at script invocation time. This could be achieved by adding a "weak pointer" wrapper around each ScriptExecutionContext instance. Objects that need a ScriptExecutionContext, can use the weak pointer instead.

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