[Webkit-unassigned] [Bug 239290] Misc compiler warnings, April 2022 edition

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239290

--- Comment #9 from Michael Catanzaro <mcatanzaro at gnome.org> ---
Did some searching... it seems C++23 has a solution for this, std::unreachable():

https://en.cppreference.com/w/cpp/utility/unreachable

In the meantime, we could add a WTF_UNREACHABLE() macro fairly easily, which could replace most use of RELEASE_ASSERT_NOT_REACHED() after switch statements that are intended to always return. Hopefully that would allow us to avoid the performance hit in these locations? Then we wouldn't have to worry about this happening again. (I know it takes you ages to track it down performance regressions....)

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