RTCEncodedFrame should have a virtual destructor

[rniwa]

5ccae9e

RTCEncodedFrame should have a virtual destructor
https://bugs.webkit.org/show_bug.cgi?id=274353

Reviewed by Chris Dumez.

Added a virtual destructor since this class has subclasses.

* Source/WebCore/Modules/mediastream/RTCEncodedFrame.h:
(WebCore::RTCEncodedFrame::~RTCEncodedFrame):

Canonical link: https://commits.webkit.org/278964@main

8bdd6b6

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[webkit-early-warning-system]

EWS run on current version of this PR (hash 8bdd6b6)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	✅ 🧪 wincairo-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	❌ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 tv	❌ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🛠 watch
✅ 🛠 🧪 unsafe-merge	✅ 🛠 watch-sim

[cdumez]

I don't think this is necessary? The constructor is marked as protected so no-one can destroy a RTCEncodedFrame directly. Having subclasses is fine as long as their destructor gets called first, which it would since the base class constructor is not public.

[cdumez]

Or maybe it is necessary because of the way RefCounted calls delete? I have to look more into it.

[geoffreygaren]

You can't construct the base class, but you can

• construct the subclass
• cast the subclass pointer to the base class pointer
• delete the base class pointer

In this case, I think that can mean that you fail to destroy RTCEncodedVideoFrame::m_metadata::dependencies (which is a Vector).

[cdumez]

Actually, looking and RefCounted::deref, I think this is indeed needed.

[webkit-commit-queue]

Committed 278964@main (5ccae9e): https://commits.webkit.org/278964@main

Reviewed commits have been landed. Closing PR #28757 and removing active labels.