2008-07-16  Geoffrey Garen  <ggaren@apple.com>

        Reviewed by Oliver Hunt.
        
        First step toward putting doubles in registers: Turned Register into a
        proper abstraction layer. It is no longer possible to cast a Register
        to a JSValue*, or a Register& to a JSValue*&, or to access the union
        inside a Register directly.
        
        SunSpider reports no change.
        
        In support of this change, I had to make the following mechanical changes
        in a lot of places:
        
        1. Clients now use explicit accessors to read data out of Registers, and
        implicit copy constructors to write data into registers.
        
        So, assignment that used to look like
        
            x.u.jsValue = y;
        
        now looks like
        
            x = y;
            
        And access that used to look like
        
            x = y.u.jsValue;
        
        now looks like
        
            x = y.jsValue();

        2. I made generic flow control specific in opcodes that made their flow
        control generic by treating a Register& as a JSValue*&. This had the
        added benefit of removing some exception checking branches from immediate
        number code.

        3. I beefed up PropertySlot to support storing a Register* in a property
        slot. For now, only JSVariableObject's symbolTableGet and symbolTablePut
        use this functionality, but I expect more clients to use it in the future.
        
        4. I changed ArgList to be a buffer of Registers, not JSValue*'s, and I
        changed ArgList iterator clients to iterate Registers, not JSValue*'s.

WebCore:

2008-07-16  Geoffrey Garen  <ggaren@apple.com>

        Reviewed by Oliver Hunt.

        Support for JavaScriptCore's first step toward putting doubles in
        registers: Treat ArgList iterators as Register*'s, not JSValue*'s.

        * bindings/js/ScheduledAction.cpp:
        (WebCore::ScheduledAction::ScheduledAction):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@35203 268f45cc-cd09-0410-ab3c-d52691b4dbfc