[squirrelfish] inlining scopechainnode into scope objects

[Andy Wingo]

On Thu 26 Apr 2012 11:59, Andy Wingo <wingo at igalia.com> writes:

> As we discussed last week, it could be a good idea to inline
> ScopeChainNode into scope objects, effectively giving scope objects a
> pointer to the next object in the chain.

Before I go too far down this thing, a note.  This makes the scope chain
link a part of JSScope, a derived JSObject.  The scope chain is the part
of the call frame that holds onto the JSGlobalObject and JSGlobalData,
and the compiler needs to be able to inline exec->globalData() /
exec->globalObject() in a whole pile of code, including JSObject.h
itself.

I am going to attempt to make JSObject.h not dereference the ExecState*
data type.  There are only a few cases in which it needs to do this, but
changing those cases to accept a JSGlobalObject& ends up changing the
prototype of JSObject::getOwnPropertySlot.  I think I can manage this
change, but it is a fair amount of work, and I wanted to get some
feedback before getting too deep.

Thoughts?

Andy

ps. This is unrelated to https://bugs.webkit.org/show_bug.cgi?id=85200.
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