[Webkit-unassigned] [Bug 74718] Remove the `value' argument to op_push_new_scope

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=74718





--- Comment #5 from Geoffrey Garen <ggaren at apple.com>  2011-12-19 18:11:09 PST ---
It's not sound to use the same mechanism for block scope as we currently use for catch. Catch is rare, and already slow, so it's OK that catch requires an object allocation and scope chain push/pop. But if "let is the new var", it's not acceptable to allocate a new scope object and push/pop the head of the scope chain every time you enter/exit a let scope. We want a new solution that distinguishes between variables that are captured and variables that aren't, allocates uncultured variables on the stack, and tears of captured variables as needed.

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