[Webkit-unassigned] [Bug 196073] New: [GLIB] User data not correctly passed to callback of functions and constructors with no parameters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196073

            Bug ID: 196073
           Summary: [GLIB] User data not correctly passed to callback of
                    functions and constructors with no parameters
           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: cgarcia at igalia.com
                CC: bugs-noreply at webkitgtk.org, mcatanzaro at igalia.com

This is because GClosure always expects a first parameter as instance. In case of functions or constructors with no parameters we insert a fake instance which is just a null pointer that is just ignored by the callback. But if the function/constructor has user data the callback will expect one parameter for the user data. In thta case we can simply swap instance/user data so that the fake instance will be the second argument and user data the first one.

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